Power transmission device and method for assembling the power transmission device

Abstract

To suppress a spline engagement part between a first and a second power transmission member from generating a tooth-hammering sound in a good assembling state with relatively simple constitution.SOLUTION: A power transmission device comprises: an energizing member 30 which is locked to a first power transmission member 10, and energizes the second power transmission member 20 in a turning direction for the first power transmission member 10 with a spline part 35 engaged with a spline part 21 of the second power transmission member 20 in a first elastic displacement state of a spring part 33; and a temporary stop member 40 which has a temporary stop part 42 for temporarily stopping the energizing member 30 to the first power transmission member 10 in a second elastic displacement state in which the spring member 33 is elastically displaced from the first elastic displacement state. On one axial side of the spline part 21 of the second power transmission member 20, a release operation part 22 is provided which releases the energizing member 30 from being temporarily stopped by the temporary stop part 42 to the first power transmission member 10.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a power transmission device and a method for assembling the power transmission device. [Background technology]

[0002] In vehicles that have an engine as a drive source and transmit power from the drive source to the drive wheels via a transmission, a flywheel is attached to the output shaft of the engine and the flywheel is connected to the input shaft of the transmission in order to suppress vibrations caused by torque fluctuations in the engine.

[0003] In cases where a flywheel attached to the output shaft of an engine and an input shaft of a transmission are connected by spline engagement, a first power transmission member and a second power transmission member that are rotatably provided in a power transmission path from a drive source to a drive wheel may be assembled by spline engagement.

[0004] When the spline portions of a first power transmission member and a second power transmission member that are rotatably arranged in a power transmission path are spline-fitted and assembled, a rattle noise may occur at the spline-fitted portion of the first power transmission member and the second power transmission member when power is not being transmitted, which may cause noise inside the vehicle cabin.

[0005] In response to this, it has been considered to suppress the rattle noise between the first and second power transmission members at the spline engagement portion between the first and second power transmission members by using a spring that urges the second power transmission member in a rotational direction relative to the first power transmission member, and urges the spline portion of the second power transmission member in a rotational direction relative to the spline portion of the first power transmission member.

[0006] For example, Patent Document 1 discloses a spring retaining member that holds a spring, which is attached to a first power transmission member by engaging it with a spline portion of the first power transmission member, and then a second power transmission member is spline-fitted to the first power transmission member, and the spline portion of the second power transmission member disengages the spring retaining member from the spline portion of the first power transmission member, thereby applying a rotational force between the first and second power transmission members. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Special Publication No. 2008-544193 Summary of the Invention [Problem to be solved by the invention]

[0008] The system described in Patent Document 1 can suppress rattle noise at the spline engagement portion between the first power transmission member and the second power transmission member by using a spring that urges the second power transmission member in a rotational direction relative to the first power transmission member, but the spring retaining member that holds the spring is engaged with the spline portions of the first power transmission member and the second power transmission member.

[0009] For this reason, it is necessary to change the shapes of the spline portions of the first power transmission member and the second power transmission member depending on the spring retaining member, and because changing the shape of the spline portion can complicate the configuration and increase costs, it is desirable to suppress rattle noise with a relatively simple configuration. Also, in a power transmission device in which the first power transmission member and the second power transmission member are assembled by spline fitting, it is desirable to be able to assemble the first power transmission member and the second power transmission member relatively easily.

[0010] Therefore, an object of the present invention is to suppress rattle noise at the spline engagement portions of the first and second power transmission members with good assembly ease using a relatively simple configuration in a power transmission device having first and second power transmission members that are assembled by spline engagement. [Means for solving the problem]

[0011] The present invention relates to a power transmission device having a first power transmission member and a second power transmission member assembled by spline fitting, the power transmission device including a spring portion elastically displaceable in a rotational direction, a locking portion provided on one end of the spring portion and locked to the first power transmission member, and a spline portion provided on the other end of the spring portion, the spring portion including a biasing member disposed on one axial side of the first power transmission member and locked to the first power transmission member, the spline portion engaging with a spline portion of the second power transmission member in a first elastic displacement state of the spring portion, and biasing the second power transmission member in one rotational direction direction relative to the first power transmission member, and a second elastically displaced member disposed on one axial side of the biasing member, the spring portion being elastically displaced from the first elastic displacement state. and a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a first elastic displacement state, and a release operation portion is provided on one axial side of the spline portion of the second power transmission member, the spline portion of the biasing member engaging with the spline portion of the second power transmission member in the first elastic displacement state of the spring portion to bias the second power transmission member to one side in a rotational direction relative to the first power transmission member, when the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member from one axial side of the temporary fastening member through the spline portion of the biasing member.

[0012] According to the present invention, when assembling the first and second power transmission members by spline fitting, a biasing member is used that is engaged with the first power transmission member and whose spline portion engages with the spline portion of the second power transmission member in a first elastic displacement state of the spring portion to bias the second power transmission member in one rotational direction relative to the first power transmission member, and a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a second elastic displacement state in which the spring portion is elastically displaced from the first elastic displacement state, and a release operating portion is provided on one axial side of the spline portion of the second power transmission member to release the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion.

[0013] As a result, the biasing member is attached by engaging it with the first power transmission member, the temporary fastening member is attached to the first power transmission member and the biasing member to temporarily fasten the biasing member to the first power transmission member in the second elastic displacement state of the spring portion, and the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member through the spline portion of the biasing member to assemble the second power transmission member to the first power transmission member, so that the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion of the temporary fastening member is released and the second power transmission member is biased to one side in the rotational direction relative to the first power transmission member, thereby suppressing the teeth rattle noise of the spline fitting portions of the first and second power transmission members.

[0014] By engaging the biasing member with the first power transmission member, temporarily fastening the biasing member to the first power transmission member with a temporary fastening member, and spline-fitting the second power transmission member to the first power transmission member without changing the shapes of the spline portions of the first and second power transmission members, the second power transmission member can be biased in one direction in the rotational direction relative to the first power transmission member, allowing for relatively easy assembly. Therefore, with a relatively simple configuration, rattle noise at the spline-fitted portions of the first and second power transmission members can be suppressed with good assembly ease.

[0015] The urging member includes a spring portion, an engagement portion, a spline portion, an inner annular portion, an outer annular portion, and a temporarily fastened portion that is temporarily fastened to the temporary fastening portion, the engagement portion being connected to the outer annular portion, the spline portion and the temporarily fastened portion being connected to the inner annular portion, and the spring portion having one end connected to the outer annular portion and the other end connected to the inner annular portion, and can be elastically displaced in the rotational direction by the inner annular portion moving to the other side in the rotational direction relative to the outer annular portion.

[0016] According to this configuration, a biasing member is used that has a spring portion that is elastically displaced in the rotational direction when the inner annular portion is moved to the other side of the rotational direction relative to the outer annular portion. Therefore, there is no need to use a spring retaining member to hold the spring, as in the case of using a spring as the biasing member, and assembly can be improved.

[0017] The temporary fastening member includes a temporary fastening main body portion through which the spline portion of the second power transmission member is inserted, and a temporary fastening portion extending from the temporary fastening main body portion to the other axial direction, and the temporary fastening portion has a regulated portion that is regulated by the first power transmission member on one side of the rotational direction, and has an abutment portion that abuts the temporarily fastened portion on the other side of the rotational direction, and a recess that is recessed in the one rotational direction on one side of the abutment portion, and the recess can be formed so that when the temporary fastening of the biasing member to the first power transmission member is released by the release operating portion, the temporary fastening main body portion and the temporary fastening portion are moved to the other axial direction side by the release operating portion of the second power transmission member, and the temporarily fastened portion is positioned within the recess.

[0018] According to this configuration, a recess is provided on the other rotational side of the temporary fastening portion of the temporary fastening member and on one axial side of the abutment portion, so that when the temporary fastening of the biasing member to the first power transmission member is released, the temporarily fastened portion can be positioned within the recess, thereby releasing the temporary fastening of the biasing member to the first power transmission member.

[0019] It is preferable to provide an assist mechanism that assists the release operation of the release operation portion in releasing the temporary fastening of the biasing member.

[0020] According to this configuration, the assist mechanism assists the release operation of the release operating portion in releasing the temporary fastening of the biasing member, so that the temporary fastening of the biasing member can be released relatively easily, and the ease of assembly of the second power transmission member to the first power transmission member can be improved.

[0021] It is preferable that the biasing member has a temporarily fixed portion that is temporarily fixed to the temporary fixing portion, the temporary fixing portion having a regulated portion that is regulated by the first power transmission member on one side in the rotational direction and an abutment portion that abuts the temporarily fixed portion on the other side in the rotational direction, the abutment portion being formed by an inclined surface portion that inclines toward one side in the rotational direction as it approaches one side in the axial direction, and the assist mechanism is composed of the inclined surface portion.

[0022] According to this configuration, the inclined surface portion formed on the abutment portion of the temporary fastening portion constituting the assist mechanism is inclined toward one side in the rotational direction as it approaches one side in the axial direction, so that the biasing force applied to the abutment portion of the temporary fastening portion by the spring portion of the biasing member from the temporarily fastened portion of the biasing member toward one side in the rotational direction can be converted into a force in a direction that releases the temporary fastening of the biasing member to the first power transmission member. This makes it possible to reduce the operating force required to release the temporary fastening of the biasing member, thereby improving ease of assembly.

[0023] The temporary fastening member is preferably fixedly attached to an outer annular portion of the biasing member.

[0024] According to this configuration, the temporary fastening member is fixedly attached to the outer annular portion of the biasing member, thereby suppressing circumferential rattle of the temporary fastening member when the first and second power transmission members are spline-fitted and assembled.

[0025] It is preferable that a plurality of the temporary fastening members are attached to the biasing member at equal intervals in the circumferential direction.

[0026] According to this configuration, the multiple temporary fastening members attached to the biasing member at equal intervals in the circumferential direction can effectively suppress rattle noise generated at the spline-fitted portions of the first and second power transmission members.

[0027] The temporary fastening member has a fixing portion fixed to the biasing member, a temporary fastening portion, and a connection portion that connects the fixing portion and the temporary fastening portion and fixes the fixing portion to the biasing member while the temporary fastening portion is elastically displaced toward the other axial direction relative to the fixing portion, and can be configured so that the temporary fastening portion moves toward one axial direction due to an elastic force relative to the fixing portion fixed to the biasing member, and the temporary fastening portion temporarily fastens the biasing member.

[0028] According to this configuration, by using a temporary fastening member configured so that the temporary fastening portion moves by elastic force to one axial side relative to a fixed portion fixed to the biasing member, the teeth rattle noise of the spline engagement portions of the first and second power transmission members can be suppressed, and circumferential rattle of the temporary fastening member can be suppressed when the first and second power transmission members are spline-engaged and assembled.

[0029] The release operation portion may be provided on a case that rotatably supports the second power transmission member.

[0030] According to this configuration, the release operating part is provided on the case that rotatably supports the second power transmission member, so that the temporary fastening of the biasing member can be released by the release operating part provided on the case that moves to the other axial side together with the second power transmission member, and the temporary fastening of the biasing member can be released using the inertial mass of the case.

[0031] It is preferable to provide an assist mechanism that assists the release operation portion in releasing the temporary fastening of the biasing member.

[0032] According to this configuration, the assist mechanism assists the release operation of the release operating portion in releasing the temporary fastening of the biasing member, so that the temporary fastening of the biasing member can be released relatively easily, and the ease of assembly of the second power transmission member to the first power transmission member can be improved.

[0033] It is preferable that the urging member has a temporarily fixed portion that is temporarily fixed to the temporary fixing portion, the temporary fixing portion has an abutment portion that abuts the temporarily fixed portion on the other side of the rotational direction, the abutment portion being formed by an inclined surface portion that inclines toward one side in the rotational direction as it approaches one side in the axial direction, and the assist mechanism is composed of the inclined surface portion.

[0034] According to this configuration, the inclined surface portion formed on the abutment portion of the temporary fastening portion that constitutes the assist mechanism inclines toward one side in the rotational direction as it approaches one side in the axial direction. Therefore, the biasing force applied to the abutment portion of the temporary fastening portion by the spring portion of the biasing member from the temporarily fastened portion of the biasing member toward one side in the rotational direction can be converted into a force in a direction that releases the temporary fastening of the biasing member to the first power transmission member. This reduces the operating force required to release the temporary fastening of the biasing member, thereby improving ease of assembly.

[0035] The first power transmission member is a flywheel connected to an output shaft of an engine, and the second power transmission member is an input shaft of a transmission.

[0036] According to this configuration, in a power transmission device including a flywheel and an input shaft of a transmission that are assembled through spline engagement, the configuration is relatively simple and easy to assemble, thereby suppressing teeth rattle noise at the spline engagement portion between the flywheel and the input shaft of the transmission.

[0037] The present invention also relates to a method for assembling a power transmission device including a first power transmission member and a second power transmission member assembled by spline fitting, the method including the steps of: attaching a biasing member having a spring portion elastically displaceable in a rotational direction, a locking portion provided on one end of the spring portion and locked to the first power transmission member, and a spline portion provided on the other end of the spring portion, the biasing member engaging the spline portion with a spline portion of the second power transmission member in a first elastic displacement state of the spring portion to bias the second power transmission member in one rotational direction direction relative to the first power transmission member by engaging the locking portion to the first power transmission member from one axial side; and attaching a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a second elastic displacement state in which the spring portion is elastically displaced from the first elastic displacement state to the first power transmission member and the biasing member from one axial side of the biasing member, the temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a second elastic displacement state in which the spring portion is elastically displaced from the first elastic displacement state. The present invention provides a method for assembling a power transmission device, comprising the steps of: temporarily fixing the biasing member to the first power transmission member in an elastically displaced state; and assembling the second power transmission member to the first power transmission member by spline-fitting a spline portion of the second power transmission member to the spline portion of the first power transmission member from one axial side of the temporary fixing member through the spline portion of the biasing member, wherein a release operation unit is provided on one axial side of the spline portion of the second power transmission member for releasing the temporary fixing of the biasing member to the first power transmission member by the temporary fixing portion of the temporary fixing member so that when the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member, in the first elastic displacement state of the spring unit, the spline portion of the biasing member engages with the spline portion of the second power transmission member to bias the second power transmission member to one side in a rotational direction relative to the first power transmission member.

[0038] According to the present invention, when assembling the first and second power transmission members by spline fitting, a biasing member is used that is engaged with the first power transmission member and whose spline portion engages with the spline portion of the second power transmission member in a first elastic displacement state of the spring portion to bias the second power transmission member in one rotational direction relative to the first power transmission member, and a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a second elastic displacement state in which the spring portion is elastically displaced from the first elastic displacement state, and a release operating portion is provided on one axial side of the spline portion of the second power transmission member to release the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion.

[0039] As a result, the biasing member is attached by engaging it with the first power transmission member, the temporary fastening member is attached to the first power transmission member and the biasing member to temporarily fasten the biasing member to the first power transmission member in the second elastic displacement state of the spring portion, and the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member through the spline portion of the biasing member to assemble the second power transmission member to the first power transmission member, so that the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion of the temporary fastening member is released and the second power transmission member is biased to one side in the rotational direction relative to the first power transmission member, thereby suppressing the teeth rattle noise of the spline fitting portions of the first and second power transmission members.

[0040] By engaging the biasing member with the first power transmission member, temporarily fastening the biasing member to the first power transmission member with a temporary fastening member, and spline-fitting the second power transmission member to the first power transmission member without changing the shapes of the spline portions of the first and second power transmission members, the second power transmission member can be biased in one direction in the rotational direction relative to the first power transmission member, allowing for relatively easy assembly. Therefore, with a relatively simple configuration, rattle noise at the spline-fitted portions of the first and second power transmission members can be suppressed with good assembly ease. Effect of the Invention

[0041] According to the power transmission device and the method for assembling the power transmission device of the present invention, it is possible to suppress rattle noise caused by the spline-fitted portions of the first power transmission member and the second power transmission member with good assembly ease using a relatively simple configuration. [Brief description of the drawings]

[0042] [Figure 1] 1 is a schematic diagram of a power unit equipped with a power transmission device according to a first embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is a front view of the flywheel, the biasing member, and the temporary fastening member. [Figure 6] FIG. [Figure 7] 7 is a cross-sectional view of the flywheel and the urging member taken along line Y7-Y7 in FIG. 5. [Figure 8] 13 is a front view of the urging member and the flywheel in which the inner annular portion has been moved to the other side in the rotational direction relative to the outer annular portion. FIG. [Figure 9] 11 is a perspective view showing a state in which a biasing member is temporarily fixed to a flywheel by a temporary fixing member. FIG. [Figure 10] 10 is an enlarged view of the temporary fastening portion of the temporary fastening member shown in FIG. 9 and its vicinity. [Figure 11] 11 is a cross-sectional view of the flywheel, the biasing member, and the temporary fixing member taken along the line Y11-Y11 in FIG. [Figure 12] FIG. 4 is an explanatory diagram for explaining assembly of an input shaft to a flywheel. [Figure 13] 13 is an explanatory diagram for explaining an operation for releasing the temporary fastening of the urging member to the flywheel. FIG. [Figure 14] 13 is another explanatory view for explaining the operation of releasing the temporary fastening of the urging member to the flywheel. FIG. [Figure 15]13 is a diagram showing a spline fitting portion in which an input shaft is biased against a flywheel by a biasing member. FIG. [Figure 16] FIG. 5 is a perspective view of a power transmission device according to a second embodiment of the present invention. [Figure 17] FIG. [Figure 18] FIG. [Figure 19] FIG. [Figure 20] FIG. 4 is a perspective view of a biasing member and a temporary fastening member. [Figure 21] 21 is an enlarged view of the temporary fastening portion of the temporary fastening member shown in FIG. 20 and its vicinity. [Figure 22] 22 is a cross-sectional view of the urging member and the temporary fastening member taken along the line Y22-Y22 in FIG. 21. [Figure 23] 13A and 13B are diagrams illustrating a state in which the urging member is temporarily fixed by a temporary fixing member. [Figure 24] 13 is a diagram showing a state in which the urging member and the temporary fastening member are attached to the flywheel. FIG. [Diagram 25] FIG. 4 is an explanatory diagram for explaining assembly of an input shaft to a flywheel. [Figure 26] 13A and 13B are diagrams illustrating a modified example of the biasing member according to the second embodiment. [Figure 27] 13A and 13B are diagrams showing modified examples of the temporary fastening member according to the second embodiment. [Figure 28] 10 is an explanatory diagram for explaining temporary fastening of the urging member by the temporary fastening member. FIG. [Figure 29] FIG. 11 is a perspective view of a power transmission device according to a third embodiment of the present invention. [Diagram 30] FIG. [Diagram 31] FIG. [Diagram 32] FIG. [Diagram 33] FIG. 4 is a perspective view of a biasing member and a temporary fastening member. [Diagram 34]34 is a cross-sectional view of the temporary fastening portion of the temporary fastening member shown in FIG. 33 and its vicinity. [Diagram 35] 13A and 13B are diagrams illustrating a state in which the urging member is temporarily fixed by a temporary fixing member. [Diagram 36] 13 is a diagram showing a state in which the urging member and the temporary fastening member are attached to the flywheel. FIG. [Figure 37] FIG. 4 is an explanatory diagram for explaining assembly of an input shaft to a flywheel. [Figure 38] 13A and 13B are diagrams showing modified examples of the temporary fastening member according to the third embodiment. [Figure 39] 10 is an explanatory diagram for explaining temporary fastening of the urging member by the temporary fastening member. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0044] Fig. 1 is a schematic diagram of a power unit equipped with a power transmission device according to a first embodiment of the present invention. As shown in Fig. 1, the power unit 1 equipped with the power transmission device according to the first embodiment of the present invention is mounted on a vehicle such as a front engine / rear drive vehicle and disposed so that its axis extends in the longitudinal direction of the vehicle body, and is equipped with an engine 2 as a drive source and an automatic transmission 3 as a transmission connected to the engine 2. The engine 2 is, but is not limited to, an in-line four-cylinder engine with four cylinders arranged in line.

[0045] The automatic transmission 3 is disposed coaxially with the output shaft 4 of the engine 2, and is connected to a flywheel 10 fixedly attached to the output shaft 4 of the engine 2 without using a torque converter. The automatic transmission 3 includes an input shaft 20 accommodated within a transmission case 5 and rotatably supported by the transmission case 5.

[0046] Although not shown, the automatic transmission 3 also includes a speed change mechanism having a plurality of planetary gear sets (planetary gear mechanisms) and a plurality of frictional engagement elements such as clutches and brakes, and an output shaft. The speed change mechanism is configured to selectively engage the plurality of frictional engagement elements to switch the power transmission path passing through each planetary gear set, thereby achieving a predetermined gear shift stage according to the driving state of the vehicle.

[0047] The automatic transmission 3 is attached to the engine 2 by assembling an input shaft 20 through spline fitting to a flywheel 10 attached to an output shaft 4 of the engine 2. In the automatic transmission 3, power from the engine 2 is transmitted from the flywheel 10 to the input shaft 20, and the power from the engine 2 is transmitted from the output shaft to the drive wheels through the speed change mechanism.

[0048] The power transmission device 6 according to this embodiment includes a flywheel 10 as a first power transmission member and an input shaft 20 as a second power transmission member, which are assembled by spline engagement. The power transmission device 6 uses a biasing member that biases the input shaft 20 in the rotational direction relative to the flywheel 10 and a temporary fastening member that temporarily fastens the biasing member to the flywheel 10, and is configured to ensure ease of assembly and suppress teeth rattle noise at the spline engagement portion between the flywheel 10 and the input shaft 20.

[0049] 2 is a perspective view of the power transmission device, FIG. 3 is a side view of the power transmission device, FIG. 4 is an exploded perspective view of the power transmission device, FIG. 5 is a front view of the flywheel, the biasing member and the temporary fixing member, FIG. 6 is a front view of the flywheel and the biasing member, and FIG. 7 is a cross-sectional view of the flywheel and the biasing member taken along line Y7-Y7 in FIG. 5.

[0050] As shown in Figures 2 to 7, the power transmission device 6, in which a flywheel 10 rotatably provided in a power transmission path from the engine 2 to the drive wheels is spline-fitted to an input shaft 20, is provided with a biasing member 30 and a temporary fixing member 40 that are arranged between the flywheel 10 and the input shaft 20.

[0051] 3, the biasing member 30 is disposed on one axial side of the flywheel 10, which is on the opposite side to the engine, the temporary fastening member 40 is disposed on one axial side of the biasing member 30, and the input shaft 20 is disposed on one axial side of the temporary fastening member 40. The biasing member 30 and the temporary fastening member 40 are each formed in a substantially flat plate shape in a radial direction substantially perpendicular to the axial directions of the flywheel 10 and the input shaft 20.

[0052] Although not shown, the flywheel 10 is fixed to the output shaft 4 of the engine 2 using a fastening bolt, and is formed into a ring shape extending like a plate in a radial direction substantially perpendicular to the axial direction. As shown in FIG. 4, the flywheel 10 has a protruding portion 11 protruding to one axial direction side at the radial center, and the protruding surface of the protruding portion 11 is formed into a flat shape in a direction substantially perpendicular to the axial direction. The flywheel 10 also has a spline portion 12 formed at the radial center to be spline-fitted to the input shaft 20. The spline portion 12 has splines whose teeth extend in the axial direction, and is formed on the inner peripheral surface of the flywheel 10.

[0053] The flywheel 10 is formed with a first opening 13 as a locked portion 13 to which the biasing member 30 is locked, and a second opening 14 as a restricting portion 14 that restricts the temporary fixing member 40 from moving in one direction in the rotational direction. The first opening 13 and the second opening 14 are each disposed radially outward from the spline portion 12, and a plurality of the first openings 13 and the second openings 14, specifically three openings, are formed at equal intervals in the circumferential direction, which is the rotational direction of the flywheel 10. The first openings 13 and the second openings 14 are alternately disposed in the circumferential direction of the flywheel 10 at positions that overlap in the radial direction of the flywheel 10.

[0054] The first opening 13 of the flywheel 10 penetrates the flywheel 10 in the axial direction and extends linearly in the radial direction, forming an elongated hole as shown in Figures 5 and 7. The second opening 14 of the flywheel 10 penetrates the flywheel 10 in the axial direction and extends linearly in the radial direction, forming an elongated hole as shown in Figures 5 and 11, which will be described later.

[0055] 4 and 6, the biasing member 30 is formed in a circular ring shape extending in a plate-like shape in a direction perpendicular to the axial direction. The biasing member 30 includes an inner annular portion 32 disposed radially inward and formed in a circular ring shape, and an outer annular portion 31 disposed radially outward and formed in a circular ring shape. The outer annular portion 31 is disposed radially outward from the inner annular portion 32 so as to be concentric therewith.

[0056] The urging member 30 also includes a spring portion 33 that is compressible in the rotational direction, a locking portion 34 that is locked to the flywheel 10, a spline portion 35 that is spline-fitted to the input shaft 20, and a temporarily fixed portion 36 that is temporarily fixed to the temporary fixing member 40. The spline portion 35 of the urging member 30 has a spline whose tooth trace extends in the axial direction, and is formed on the inner circumferential surface of the inner annular portion 32 and connected to the inner annular portion 32. The spline portion 35 of the urging member 30 is for engaging with and biasing the spline portion 21 of the input shaft 20, and the machining precision of the spline portion 21 can be made lower than that of the flywheel 10 and the input shaft 20.

[0057] The spring portion 33 of the biasing member 30 includes a first radial extension portion 33a extending radially outward in a straight line from the inner annular portion 32, a second radial extension portion 33b extending radially inward from the outer annular portion 31 in a straight line substantially parallel to the first radial extension portion 33a, a third radial extension portion 33c extending radially in a straight line substantially parallel to the first radial extension portion 33a and the second radial extension portion 33b between the first radial extension portion 33a and the second radial extension portion 33b, an outer connecting portion 33d extending in an arc shape connecting the radial outer sides of the first radial extension portion 33a and the third radial extension portion 33c, and an inner connecting portion 33e extending in an arc shape connecting the radial inner sides of the third radial extension portion 33c and the second radial extension portion 33b.

[0058] One end of the spring portion 33 is connected to the outer annular portion 31 and the other end is connected to the inner annular portion 32, and is formed in a substantially S-shape when viewed from the other axial direction side. The spring portion 33 is configured to be compressible in the rotational direction by the inner annular portion 32 moving to the other rotational direction side relative to the outer annular portion 31, so that the first radial extension portion 33a moves to the other rotational direction side relative to the second radial extension portion 33b.

[0059] The locking portion 34 of the biasing member 30 extends to one axial side from the tip side of a first arm portion 37 that extends radially inward from the outer annular portion 31 on one side in the rotational direction of the spring portion 33 (see FIG. 7). The locking portion 34 is formed in a substantially rectangular shape in a cross section perpendicular to the axial direction, and is inserted into and locked to the first opening 13 of the flywheel 10.

[0060] The temporarily fixed portion 36 of the urging member 30 is provided on the tip side of a second arm portion 38 that extends radially outward in a substantially straight line from the inner annular portion 32 on the other rotational direction side of the spring portion 33. The temporarily fixed portion 36 of the urging member 30 is formed on the end face on one rotational direction side of the second arm portion 38 so as to be recessed on the other rotational direction side, and is provided at a position corresponding to the second opening 14 of the flywheel 10.

[0061] A plurality of spring portions 33, locking portions 34 and temporarily fixed portions 36, specifically three of them, are formed at equal intervals in the circumferential direction of the urging member 30. Each spring portion 33 is disposed between the locking portion 34 disposed on one side in the rotational direction and the temporarily fixed portion 36 disposed on the other side in the rotational direction.

[0062] The biasing member 30 is engaged with the flywheel 10, and in a first compressed state of the spring portion 33 in which the inner annular portion 32 is moved to the other side of the rotational direction relative to the outer annular portion 31, the spline portion 35 engages with the spline portion 21 of the input shaft 20, thereby biasing the input shaft 20 to one side of the rotational direction relative to the flywheel 10.

[0063] A pin insertion hole 39 is formed at the tip of the second arm portion 38 of the urging member 30. The pin insertion hole 39 is formed so that a pin provided on a rotating tool (not shown) can be inserted into the pin insertion hole 39. When the rotating tool is moved in the other direction in the rotational direction with the pin of the rotating tool inserted into the pin insertion hole 39, the inner annular portion 32 of the urging member 30 is moved in the other direction in the rotational direction.

[0064] 4, the temporary fixing member 40 includes a temporary fixing main body 41 that extends in a plate shape in a direction perpendicular to the axial direction and is formed in an annular shape, and a temporary fixing portion 42 that extends to the other axial side from the temporary fixing main body 41. The temporary fixing main body 41 is adapted to have the spline portion 21 of the input shaft 20 inserted therethrough.

[0065] The temporary fixing portion 42 extends from the temporary fixing main body portion 41 to the other axial side in a generally rectangular shape, and is formed so as to temporarily fix the biasing member 30 to the flywheel 10 when the spring portion 33 of the biasing member 30 is in a second compressed state which is compressed more than the first compressed state. A plurality of temporary fixing portions 42, specifically three temporary fixing portions 42, are formed at equal intervals in the circumferential direction of the temporary fixing member 40. The temporary fixing portions 42 are formed corresponding to the second opening 14 of the flywheel 10 so as to be inserted into the second opening 14 of the flywheel 10.

[0066] As shown in Figure 11 described later, the temporary fixing portion 42 has a regulated portion 43 that is regulated by the second opening 14 of the flywheel 10 on one side in the rotational direction, and has a contact portion 44 that abuts against the temporary fixing portion 36 of the biasing member 30 on the other side in the rotational direction, and a recess 45 that is recessed toward one side in the rotational direction on one axial side of the contact portion 44.

[0067] The regulated portion 43 is formed by an end face on one side of the rotational direction of the temporary fastening portion 42 which extends linearly in the axial direction of the temporary fastening member 40, and the abutment portion 44 is formed by an end face on the other side of the rotational direction of the temporary fastening portion 42 which extends linearly at a predetermined angle relative to the axial direction of the temporary fastening member 40.

[0068] The contact portion 44 is formed by an inclined surface portion that inclines toward one side in the rotation direction as it approaches one side in the axial direction. The contact portion 44 is provided with a first inclined surface portion 44a as a first contact portion 44a provided on one side in the axial direction and extending linearly at a predetermined angle θ1 with respect to the axial direction, and a second inclined surface portion 44b as a second contact portion 44b provided on the other side in the axial direction and extending linearly at a predetermined angle θ2 with respect to the axial direction, and the predetermined angle θ2 is formed to be larger than the predetermined angle θ1. The predetermined angle θ1 is set to an angle between 5 degrees and 15 degrees, for example, and the predetermined angle θ2 is set to an angle between 30 degrees and 45 degrees, for example.

[0069] The recess 45 of the temporary fixing portion 42 is formed by the end face on the other side in the rotational direction of the temporary fixing portion 42, and is recessed in a substantially rectangular shape on one side in the rotational direction. The recess 45 is formed so that the temporarily fixed portion 36 of the biasing member 30 is disposed within the recess 45 without abutting against the recess 45 when the input shaft 20 is spline-fitted to the flywheel 10.

[0070] 4, the input shaft 20 has a spline portion 21 on its outer circumferential surface on the other axial side, which is the engine side. The spline portion 21 of the input shaft 20 has splines whose teeth extend in the axial direction, and is formed to be spline-fitted with the spline portion 12 of the flywheel 10 and the spline portion 35 of the biasing member 30.

[0071] The input shaft 20 is also provided with a release operation portion 22 on one axial side of the spline portion 21, which releases the temporary fastening of the urging member 30 to the flywheel 10 by the temporary fastening portion 42 of the temporary fastening member 40. The release operation portion 22 extends radially outward from the outer circumferential surface of the input shaft 20 in a plate shape in a direction perpendicular to the axial direction, and is formed in a circular shape.

[0072] The release operating portion 22 is formed so that when the spline portion 21 of the input shaft 20 is inserted through the temporary fastening member 40 from one axial side of the temporary fastening member 40 and spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 35 of the biasing member 30, in the first compressed state of the spring portion 33, the spline portion 35 of the biasing member 30 engages with the spline portion 21 of the input shaft 20 to bias the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

[0073] In the power transmission device 6, the biasing member 30 is attached to the flywheel 10 by engaging it from one axial side, and then the temporary fixing member 40 is attached to the flywheel 10 and the biasing member 30 from one axial side to temporarily fix the biasing member 30 to the flywheel 10 in the second compressed state of the spring portion 33, and then the input shaft 20 is spline-fitted from one axial side, with the spline portion 21 of the input shaft 20 splined to the spline portion 12 of the flywheel 10 through the spline portion 35 of the biasing member 30, and the input shaft 20 is assembled to the flywheel 10 by spline fitting.

[0074] 8 is a front view of the biasing member and the flywheel in which the inner annular portion has been moved to the other side in the rotational direction relative to the outer annular portion. When assembling the input shaft 20 to the flywheel 10 by spline-fitting it, first, as shown in FIG. 6, the biasing member 30 is attached to the flywheel 10 by engaging the locking portion 34 of the biasing member 30 with the locked portion 13 of the flywheel 10.

[0075] 8, the second arm portion 38 of the urging member 30 is moved toward the other side in the rotational direction with the locking portion 34 locked to the locked portion 13 of the flywheel 10. The inner annular portion 32 of the urging member 30 is moved toward the other side in the rotational direction relative to the outer annular portion 31 so that the spring portion 33 is in a second compressed state, which is compressed from a first compressed state in which the spring portion 33 urges the input shaft 20 toward one side in the rotational direction relative to the flywheel 10.

[0076] Fig. 9 is a perspective view showing a state in which the urging member is temporarily fixed to the flywheel by a temporary fixing member, Fig. 10 is an enlarged view of the temporary fixing portion of the temporary fixing member shown in Fig. 9 and its vicinity, and Fig. 11 is a cross-sectional view of the flywheel, the urging member, and the temporary fixing member taken along line Y11-Y11 in Fig. 10. As shown in Fig. 9, with the spring portion 33 of the urging member 30 compressed to the second compressed state, a temporary fixing member 40 is attached to the flywheel 10 and the urging member 30, so that the urging member 30 is temporarily fixed to the flywheel 10.

[0077] 10 and 11, the temporary fastening member 40 is inserted into the second opening 14 of the flywheel 10 so that the abutting portion 44 of the temporary fastening portion 42 abuts against the temporarily fastened portion 36 of the urging member 30 and the regulated portion 43 of the temporary fastening portion 42 is regulated by the regulating portion 14 of the flywheel 10, thereby temporarily fastening the urging member 30 to the flywheel 10. When the urging member 30 is temporarily fastened to the flywheel 10 by the temporary fastening member 40, the spline portion 35 of the urging member 30 and the spline portion 12 of the flywheel 10 are provided so that their splines approximately match.

[0078] Fig. 12 is an explanatory diagram for explaining the assembly of the input shaft to the flywheel. Next, as shown in Fig. 12, the input shaft 20 is assembled from one axial side so that the spline portion 21 passes through the temporary fixing member 40 and is spline-fitted to the spline portion 12 of the flywheel 10 via the spline portion 35 of the biasing member 30.

[0079] 13 is an explanatory diagram for explaining an operation for releasing the temporary fastening of the biasing member to the flywheel. When the input shaft 20 is assembled to the flywheel 10, as shown in FIG. 13, the spline portion 21 of the input shaft 20 is inserted through the temporary fastening member 40 and splined to the spline portion 12 of the flywheel 10 via the spline portion 35 of the biasing member 30, so that the input shaft 20 is splined to the flywheel 10.

[0080] When the input shaft 20 is spline-fitted to the flywheel 10, the release operating portion 22 of the input shaft 20 abuts against the temporary fastening main body portion 41 of the temporary fastening member 40, and as the input shaft 20 moves in the other axial direction, the release operating portion 22 moves the temporary fastening member 40 in the other axial direction, and the temporary fastening portion 42 moves in the other axial direction.

[0081] When the temporary fastening portion 42 is moved toward the other axial side, a biasing force F1 acts on one side of the rotation direction from the temporarily fastened portion 36 of the biasing member 30 to the abutting portion 44 of the temporary fastening portion 42 due to the spring portion 33 of the biasing member 30 in a compressed state. The temporary fastening portion 42 is pressed by the biasing force F1 with a pressing force F2 in a direction perpendicular to the inclined surface portion of the abutting portion 44 at the contact portion between the temporarily fastened portion 36 and the abutting portion 44.

[0082] The pressing force F2 is decomposed into an axial pressing force F2a and a rotational pressing force F2b, and the temporary fixing portion 42 is pressed in the axial direction by the axial pressing force F2a. The pressing force F2a is expressed as F1·tan θ1 at the first contact portion 44a, and is expressed as F1·tan θ2 at the second contact portion 44b.

[0083] The inclined surface portion 44 formed on the abutment portion 44 converts the biasing force F1 by the spring portion 33 of the biasing member 30 into a force F2a in a direction to release the temporary fastening of the biasing member 30 to the flywheel 10. The inclined surface portion 44 formed on the abutment portion 44 inclines toward one side in the rotational direction as it approaches one side in the axial direction, and constitutes an assist mechanism that assists the release operation portion 22 of the input shaft 20 in releasing the temporary fastening of the biasing member 30.

[0084] Fig. 14 is another explanatory diagram for explaining the operation of releasing the temporary fastening of the urging member to the flywheel. As shown in Fig. 14, when the release operation part 22 moves the temporary fastening main body part 41 and the temporary fastening part 42 to the other axial side until the temporarily fastened part 36 is disposed in the recess 45 without contacting the recess 45, the release operation part 22 releases the temporary fastening of the urging member 30 to the flywheel 10, and the input shaft 20 is assembled to the flywheel 10 by being spline-fitted.

[0085] When the input shaft 20 is moved to the other axial direction until the temporary fastening portion 36 is positioned within the recess 45, the inner annular portion 32 of the biasing member 30 moves to one side in the rotational direction relative to the outer annular portion 31 due to the spring portion 33, and the biasing member 30 is engaged with the flywheel 10 and, in the first compressed state of the spring portion 33, the spline portion 35 engages with the spline portion 21 of the input shaft 20, biasing the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

[0086] Fig. 15 is a diagram showing a splined engagement portion where an input shaft is urged against a flywheel by an urging member. As shown in Fig. 15, in the splined engagement portion where the splined portion 12 of the flywheel 10 and the splined portion 21 of the input shaft 20 are splined, the input shaft 20 is urged to one side in the rotational direction by the urging member 30, the other side in the rotational direction of the teeth portion 21a of the splined portion 21 of the input shaft 20 is engaged with one side in the rotational direction of the teeth portion 35a of the splined portion 35 of the urging member 30, and the one side in the rotational direction of the teeth portion 21a of the splined portion 21 of the input shaft 20 is engaged with the other side in the rotational direction of the teeth portion 12a of the splined portion 12 of the flywheel 10.

[0087] In this way, the power transmission device 6 uses a biasing member 30 that biases the input shaft 20 in the rotational direction relative to the flywheel 10, and a temporary fixing member 40 that temporarily fixes the biasing member 30 to the flywheel 10, and the biasing member 30 biases the input shaft 20 to one side in the rotational direction relative to the flywheel 10, thereby suppressing the teeth rattle noise at the spline engagement portion between the flywheel 10 and the input shaft 20.

[0088] In the power transmission device 6, the biasing member 30 is attached by engaging it with the flywheel 10, the temporary fixing member 40 is attached to the flywheel 10 and the biasing member 30 to temporarily fix the biasing member 30 to the flywheel 10 in a compressed state of the spring portion 33, and the input shaft 20 is spline-fitted and assembled to the flywheel 10, thereby enabling the input shaft 20 to be spline-fitted and assembled with good assembling properties. When assembling the input shaft 20 attached to the automatic transmission 3 to the flywheel 10 attached to the output shaft 4 of the engine 2, they can be spline-fitted and assembled with good assembling properties.

[0089] In this embodiment, the input shaft 20 is biased in one direction relative to the flywheel 10 by the biasing member 30, but the input shaft 20 may be biased in the other direction relative to the flywheel 10 by the biasing member 30. The locked portion 13 and the restricting portion 14 formed on the flywheel 10 are formed to penetrate the flywheel 10, but they may be openings recessed from one axial side to the other axial side without penetrating the flywheel 10. The contact portion 44 of the temporary fastening portion 42 has a first contact portion 44a and a second contact portion 44b, but may be formed only by the first contact portion 44a.

[0090] In this embodiment, three locking portions 34, spring portions 33 and temporarily fixed portions 36 of the urging member 30 are provided at approximately equal intervals in the circumferential direction of the urging member 30, but a plurality of such portions, such as two or four, may be provided at approximately equal intervals in the circumferential direction of the urging member 30. Even in such a case, the locked portions 13 and the restricting portions 14 of the flywheel 10 and the temporarily fixed portions 42 of the temporarily fixed member 40 are provided in accordance with the locking portions 34 and temporarily fixed portions 36 of the urging member 30.

[0091] In this embodiment, the biasing member 30 has a spring portion 33 that is compressible in the rotational direction, and is formed so as to bias the input shaft 20 to one side in the rotational direction relative to the flywheel 10 when the spring portion 33 is in a first compressed state, and the temporary fixing member 40 is formed so as to temporarily fix the biasing member 30 to the flywheel 10 when the spring portion 33 is in a second compressed state in which it is more compressed than the first compressed state. The spring portion 33 is configured so as to be elastically displaceable in the compression direction in the rotational direction, but it is also possible to configure it so as to be elastically displaceable in the tension direction in the rotational direction.

[0092] The biasing member 30 has a spring portion that can be pulled in the rotational direction, and is formed so as to bias the input shaft 20 to one side in the rotational direction relative to the flywheel 10 when the spring portion is in a first tension state, and the temporary fixing member 40 can also be formed so as to temporarily fix the biasing member 30 to the flywheel 10 when the spring portion is in a second tension state in which it is pulled further than the first tension state.

[0093] In this case, the spring portion is pulled in the rotational direction by moving the inner annular portion 32 relative to the outer annular portion 31 in the other direction of the rotational direction, and the release operating portion 22 provided on one axial side of the spline portion 21 of the input shaft 20 is configured to release the temporary fastening of the biasing member 30 to the flywheel 10 by the temporary fastening portion of the temporary fastening member 40 so that when the spline portion 21 of the input shaft 20 is spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 35 of the biasing member 30, in a first tension state of the spring portion, the spline portion 35 of the biasing member 30 engages with the spline portion 21 of the input shaft 20 to bias the input shaft 20 to one direction in the rotational direction relative to the flywheel 10.

[0094] In this way, in the power transmission device 6 of this embodiment, when the first and second power transmission members 10, 20 are assembled by spline fitting, a biasing member 30 is used that is engaged with the first power transmission member 10 and has a spline portion 35 engaged with the spline portion 21 of the second power transmission member 20 in a first elastic displacement state of the spring portion 33 to bias the second power transmission member 20 in one direction in the rotational direction relative to the first power transmission member 10, and a temporary fastening member 40 having a temporary fastening portion 42 that temporarily fastens the biasing member 30 to the first power transmission member 10 in a second elastic displacement state in which the spring portion 33 is elastically displaced from the first elastic displacement state, and a release operating portion 22 is provided on one axial side of the spline portion 21 of the second power transmission member 20 to release the temporary fastening of the biasing member 30 to the first power transmission member 10 by the temporary fastening portion 42.

[0095] As a result, the biasing member 30 is attached by engaging it with the first power transmission member 10, the temporary fastening member 40 is attached to the first power transmission member 10 and the biasing member 30 to temporarily fasten the biasing member 30 to the first power transmission member 10 in the second elastic displacement state of the spring portion 33, and the spline portion 21 of the second power transmission member 20 is spline-fitted with the spline portion 12 of the first power transmission member 10 through the spline portion 35 of the biasing member 30 to assemble the second power transmission member 20 to the first power transmission member 10, whereby the temporary fastening of the biasing member 30 to the first power transmission member 10 by the temporary fastening portion 42 of the temporary fastening member 40 is released and the second power transmission member 20 is biased to one side in the rotational direction relative to the first power transmission member 10, thereby suppressing the teeth rattle noise of the spline fitting portions of the first and second power transmission members 10, 20.

[0096] By engaging the biasing member 30 with the first power transmission member 10, temporarily fixing the biasing member 30 to the first power transmission member 10 with the temporary fixing member 40, and spline-fitting the second power transmission member 20 to the first power transmission member 10 without changing the shapes of the spline portions 12, 21 of the first and second power transmission members 10, 20, the second power transmission member 20 can be biased in one direction in the rotational direction relative to the first power transmission member 10, allowing for relatively easy assembly. Therefore, with a relatively simple configuration, it is possible to suppress rattle noise at the spline-fitted portions of the first and second power transmission members 10, 20 with good assembly ease.

[0097] In addition, the urging member 30 includes a spring portion 33, an engaging portion 34, a spline portion 35, an inner annular portion 32, an outer annular portion 31, and a temporarily fixed portion 36 that is temporarily fixed to the temporary fixing portion 42, the engaging portion 34 is connected to the outer annular portion 31, the spline portion 35 and the temporarily fixed portion 36 are connected to the inner annular portion 32, and the spring portion 33 has one end connected to the outer annular portion 31 and the other end connected to the inner annular portion 32, and is elastically displaced in the rotational direction as the inner annular portion 32 moves in the other rotational direction relative to the outer annular portion 31.

[0098] As a result, a biasing member 30 is used that has a spring portion 33 that is elastically displaced in the rotational direction when the inner annular portion 32 is moved toward the other side of the rotational direction relative to the outer annular portion 31.Therefore, there is no need to use a spring retaining member for retaining the spring, as in the case of using a spring as the biasing member 30, and assembly can be improved.

[0099] In addition, the temporary fixing member 40 includes a temporary fixing main body portion 41 through which the spline portion 21 of the second power transmission member 20 is inserted, and a temporary fixing portion 42 extending from the temporary fixing main body portion 41 to the other axial direction, and the temporary fixing portion 42 has a regulated portion 43 regulated by the first power transmission member 10 on one side of the rotational direction, and a contact portion 44 that abuts against the temporarily fixed portion 36 on the other side of the rotational direction, and a recess 45 that is recessed toward one side of the rotational direction on one axial side of the abutting portion 44, and the recess 45 is formed so that when the temporary fixing of the biasing member 30 to the first power transmission member 10 is released by the release operating portion 22, the temporary fixing main body portion 41 and the temporary fixing portion 42 are moved to the other axial direction side by the release operating portion 22 of the second power transmission member 20, and the temporarily fixed portion 36 is positioned within the recess 45.

[0100] As a result, a recess 45 is provided on the other rotational side of the temporary fixing portion 42 of the temporary fixing member 40 and on one axial side of the abutment portion 44, so that when the temporary fixing of the biasing member 30 to the first power transmission member 10 is released, the temporarily fixed portion 36 can be positioned within the recess 45, thereby releasing the temporary fixation of the biasing member 30 to the first power transmission member 10.

[0101] Also, an assist mechanism 44 is provided that assists the release operation portion 22 in releasing the temporary fastening of the biasing member 30 .

[0102] As a result, the assist mechanism 44 assists the release operation of the temporary fastening of the biasing member 30 by the release operating portion 22, making it possible to relatively easily release the temporary fastening of the biasing member 30 and improving the ease of assembly of the second power transmission member 20 to the first power transmission member 10.

[0103] In addition, the urging member 30 has a temporarily fixed portion 36 that is temporarily fixed to the temporary fixing portion 42, and the temporary fixing portion 42 has a regulated portion 43 that is regulated by the first power transmission member 10 on one side in the rotational direction, and a contact portion 44 that abuts against the temporarily fixed portion 36 on the other side in the rotational direction, and the contact portion 44 is formed by an inclined surface portion 44 that inclines toward one side in the rotational direction as it approaches one side in the axial direction, and the assist mechanism is constituted by the inclined surface portion 44.

[0104] As a result, the inclined surface portion 44 formed on the abutting portion 44 of the temporary fastening portion 42 constituting the assist mechanism 44 is inclined to one side in the rotational direction as it approaches one side in the axial direction, so that the biasing force F1 biased to one side in the rotational direction by the spring portion 33 of the biasing member 30 from the temporarily fastened portion 36 of the biasing member 30 to the abutting portion 44 of the temporary fastening portion 42 can be converted into a force F2a in a direction for releasing the temporary fastening of the biasing member 30 to the first power transmission member 10. This makes it possible to reduce the operating force for releasing the temporary fastening of the biasing member 30, and improves ease of assembly.

[0105] The first power transmission member 10 is a flywheel 10 connected to the output shaft 4 of the engine 2 , and the second power transmission member 20 is an input shaft 20 of the transmission 3 .

[0106] As a result, in a power transmission device 6 having a flywheel 10 and an input shaft 20 of a transmission 3 that are assembled through spline engagement, the gear rattle noise at the spline engagement portion between the flywheel 10 and the input shaft 20 of the transmission 3 can be suppressed with ease of assembly using a relatively simple configuration.

[0107] Fig. 16 is a perspective view of a power transmission device according to a second embodiment of the present invention, Fig. 17 is an exploded perspective view of the power transmission device, Fig. 18 is a front view of a biasing member, Fig. 19 is a front view of the biasing member and the temporary fastening member, and Fig. 20 is a perspective view of the biasing member and the temporary fastening member. As with the power transmission device 6 according to the first embodiment, the power transmission device 106 according to the second embodiment includes a biasing member 130 and a temporary fastening member 140 arranged between the flywheel 10 and the input shaft 20, as shown in Figs. 16 to 20.

[0108] The biasing member 130 is disposed on one axial side of the flywheel 10, which is the side opposite to the engine, the temporary fastening member 140 is disposed on one axial side of the biasing member 130, and the input shaft 20 is disposed on one axial side of the temporary fastening member 140. The biasing member 130 and the temporary fastening member 140 are each formed in a substantially flat plate shape in a radial direction substantially perpendicular to the axial directions of the flywheel 10 and the input shaft 20. In this embodiment, the temporary fastening member 140 is divided into a plurality of parts, specifically three parts, at equal intervals in the circumferential direction.

[0109] As shown in FIG. 17, the flywheel 10 has a protrusion 11 on the radial center side, and a spline portion 12 is formed in the radial center. The flywheel 10 has a first opening 13 as a locked portion 13 to which the urging member 130 is locked, and in this embodiment, the first opening 13 is formed as a screw hole. A plurality of first openings 13, specifically three, are formed at equal intervals in the circumferential direction, which is the rotation direction of the flywheel 10. The flywheel 10 also has a second opening 15 formed to avoid interference with the temporary fixing member 140. The second openings 15 are formed in a circular shape, and a plurality of second openings 15, specifically six, are formed at equal intervals in the circumferential direction of the flywheel 10.

[0110] 17 and 18, the biasing member 130 is formed in a circular ring shape extending in a plate-like manner in a direction perpendicular to the axial direction. The biasing member 130 includes an inner annular portion 132 disposed radially inward and formed in a circular ring shape, and an outer annular portion 131 disposed radially outward and formed in a circular ring shape. The outer annular portion 131 is disposed radially outward from the inner annular portion 132 so as to be concentric therewith.

[0111] The urging member 130 also includes a spring portion 133 that is compressible in the rotational direction, a locking portion 134 that is locked to the flywheel 10, a spline portion 135 that is spline-fitted to the input shaft 20, and a temporarily fixed portion 136 that is temporarily fixed to the temporary fixing member 140. The spline portion 135 is formed on the inner circumferential surface of the inner annular portion 132 and is connected to the inner annular portion 132.

[0112] The spring portion 133 of the biasing member 130 includes a first radial extension portion 133a extending radially outward in a straight line from the inner annular portion 132, a second radial extension portion 133b extending radially inward from the outer annular portion 131 in a straight line approximately parallel to the first radial extension portion 133a, a third radial extension portion 133c extending radially in a straight line approximately parallel to between the first and second radial extension portions 133a, 133b, an outer connecting portion 133d extending in an arc shape connecting the radial outer sides of the first and third radial extension portions 133a, 133c, and an inner connecting portion 133e extending in an arc shape connecting the radial inner sides of the third and second radial extension portions 133c, 133b.

[0113] One end of the spring portion 133 is connected to the outer annular portion 131 and the other end is connected to the inner annular portion 132, and is formed in a substantially S-shape when viewed from one axial side. The spring portion 133 is configured to be compressible in the rotational direction by the inner annular portion 132 moving to the other rotational side relative to the outer annular portion 131, so that the first radial extension portion 133a moves to the other rotational side relative to the second radial extension portion 133b.

[0114] The locking portion 134 of the biasing member 130 is composed of a tip portion 137a of a first arm portion 137 extending radially inward from the outer annular portion 131 on the other side in the rotational direction of the spring portion 133, and a fastening bolt B1 (see FIG. 17) inserted from one axial side into a bolt insertion hole 137b provided in the tip portion 137a. The biasing member 130 is adapted to be locked and fixed to the flywheel 10 by screwing the fastening bolt B1 into the first opening 13 of the flywheel 10.

[0115] The temporarily fixed portion 136 of the biasing member 130 is provided on the tip side of a second arm portion 138 that extends radially outward in a substantially straight line from the inner annular portion 132 on one side in the rotational direction of the spring portion 133. The temporarily fixed portion 136 of the biasing member 130 is formed on the end face on one side in the rotational direction of the second arm portion 138 so as to be recessed on the other side in the rotational direction.

[0116] A plurality of spring portions 133, locking portions 134, and temporarily fixed portions 136, specifically three spring portions 133, are formed at equal intervals in the circumferential direction of biasing member 130. Each spring portion 133 is disposed between locking portion 134 disposed on the other side in the rotation direction and temporarily fixed portion 136 disposed on one side in the rotation direction.

[0117] The biasing member 130 is engaged with the flywheel 10, and in a first compressed state of the spring portion 133 in which the inner annular portion 132 is moved to the other side in the rotational direction relative to the outer annular portion 131, the spline portion 135 engages with the spline portion 21 of the input shaft 20, thereby biasing the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

[0118] In this embodiment, the temporary fastening member 140 is composed of three temporary fastening members 140 arranged at equal intervals in the circumferential direction, as shown in Fig. 17. The temporary fastening member 140 is formed of a plate-shaped member, and as shown in Figs. 19 and 20, includes a fixing portion 141 fixed to the urging member 130, a temporary fastening portion 142 that temporarily fastens the urging member 130 to the flywheel 10, a temporary fastening main body portion 143 that connects the fixing portion 141 and the temporary fastening portion 142 and extends radially in a direction substantially perpendicular to the axial direction, and a radial extension portion 144 that extends radially inward from one circumferential side of the temporary fastening main body portion 143 relative to the temporary fastening portion 142. The temporary fastening main body portion 143 functions as a connection portion that connects the fixing portion 141 and the temporary fastening portion 142.

[0119] The fixing portion 141 is provided on the radially outer side of the temporary fastening main body portion 143, disposed along one axial side of the outer annular portion 131 of the urging member 130, and fixed to the outer annular portion 131 by welding or the like. The fixing portion 141 also has a hook portion 141a (see FIG. 22) that is folded back in an inverted U-shape from one axial side of the outer annular portion 131, passing through the radially outer side, to the radially inner side, and is fixed to the outer annular portion 131 with the hook portion 141a fitted into the radially outer side of the outer annular portion 131. Note that the fixing portion 141 may not be provided with the hook portion 141a.

[0120] The temporary fastening member 140 is configured such that the radially inner side of the temporary fastening main body portion 143 can be elastically displaced in one axial direction relative to the fixed portion 141 by fixing the fixed portion 141 to the biasing member 130, and the temporary fastening portion 142 and the radial extension portion 144 can be elastically displaced in one axial direction.

[0121] The temporary fastening portion 142 is provided radially inward of the temporary fastening main body portion 143 and extends to the other axial side, and is formed to temporarily fasten the urging member 130 to the flywheel 10 when the spring portion 133 of the urging member 130 is in a second compressed state compressed from the first compressed state. In this embodiment, the temporary fastening portion 142 is fixed to the urging member 130 engaged and fixed to the flywheel 10, thereby temporarily fastening the urging member 130 to the flywheel 10. The temporary fastening portion 142 is formed corresponding to the second opening 15 so as to avoid interference with the flywheel 10.

[0122] Fig. 21 is an enlarged view of the temporary fastening portion and its vicinity of the temporary fastening member shown in Fig. 20, and Fig. 22 is a cross-sectional view of the urging member and the temporary fastening member taken along line Y22-Y22 in Fig. 21. As shown in Figs. 21 and 22, the temporary fastening portion 142 has, on the other side in the rotational direction, a contact portion 145 that contacts the temporarily fastened portion 136 of the urging member 130, and a recess 146 that is recessed to one side in the rotational direction on one axial side of the contact portion 145.

[0123] The abutment portion 145 is formed by an end face on the other side in the rotational direction of the temporary fixing portion 142 that extends linearly at a predetermined angle with respect to the axial direction. The abutment portion 145 is formed by an inclined surface portion that inclines at a predetermined angle θ3 toward one side in the rotational direction as it approaches one side in the axial direction. The predetermined angle θ3 is set to an angle between 5 degrees and 15 degrees, for example.

[0124] The recess 146 of the temporary fixing portion 142 is formed by the end face on the other side in the rotational direction of the temporary fixing portion 142, and is recessed in a substantially rectangular shape on one side in the rotational direction. The recess 146 is formed so that the temporarily fixed portion 136 of the biasing member 130 is disposed within the recess 146 without abutting against the recess 146 when the input shaft 20 is spline-fitted to the flywheel 10.

[0125] The radially extending portion 144 of the temporary fixing member 140 extends radially inward from the other rotational direction side of the temporary fixing main body portion 143 relative to the temporary fixing portion 142. When the radially inner side of the temporary fixing main body portion 143 is elastically displaced toward one axial direction relative to the fixed portion 141, the radially extending portion 144 is elastically displaced toward one axial direction relative to the temporary fixing main body portion 143.

[0126] When the radial extension portion 144 of the temporary fastening member 140 is elastically displaced to one side in the axial direction, the radially inner side of the temporary fastening main body portion 143 is elastically displaced to one side in the axial direction, and the abutment portion 145 abuts against the temporarily fastened portion 136 of the biasing member 130, temporarily fastening the biasing member 130 in a second compressed state in which the spring portion 133 of the biasing member 130 is compressed more than the first compressed state.

[0127] Fig. 23 is a diagram showing a state in which the urging member is temporarily fixed by the temporary fixing member. As shown in Fig. 23, when the radial inner side of the temporary fixing main body part 143 of the temporary fixing member 140 is elastically displaced in one axial direction by an operator or the like in a state in which the fixing part 141 is fixed to the urging member 130, the temporary fixing part 142 moves in one axial direction and the abutting part 145 of the temporary fixing part 142 abuts against the temporarily fixed part 136 of the urging member 130, so that the spring part 133 of the urging member 130 is temporarily fixed in a second compressed state compressed from the first compressed state.

[0128] As in the first embodiment, the abutment portion 145 may be provided with a first inclined surface portion as a first abutment portion provided on one axial side and extending linearly at a first predetermined angle with respect to the axial direction, and a second inclined surface portion as a second abutment portion provided on the other axial side and extending linearly at a second predetermined angle larger than the first predetermined angle with respect to the axial direction, and the first predetermined angle may be set to an angle between 5 degrees and 15 degrees, for example, and the second predetermined angle may be set to an angle between 30 degrees and 45 degrees, for example.

[0129] 17, the input shaft 20 has a spline portion 21 on the outer circumferential surface on the other axial side. The spline portion 21 has splines whose teeth extend in the axial direction, and is formed to be spline-fitted with the spline portion 12 of the flywheel 10 and the spline portion 135 of the biasing member 130.

[0130] The input shaft 20 is also provided with a release operation portion 22 for releasing the temporary fastening of the urging member 130 to the flywheel 10 by the temporary fastening portion 142 of the temporary fastening member 140 on one axial side of the spline portion 21. The release operation portion 22 is formed in a circular shape and is formed larger radially outward than the radially inner end of the radially extending portion 144 of the temporary fastening member 140.

[0131] The release operating portion 22 is formed so that when the spline portion 21 of the input shaft 20 is inserted through the radial center side of the temporary fastening member 140 from one axial side of the temporary fastening member 140 and spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 135 of the biasing member 130, in the first compressed state of the spring portion 133, the spline portion 135 of the biasing member 130 engages with the spline portion 21 of the input shaft 20 to bias the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

[0132] In the power transmission device 106, the biasing member 130 is attached to the flywheel 10 by engaging it from one axial side, and the temporary fixing member 140 is attached to the biasing member 130 from one axial side, and the biasing member 130 is temporarily fixed to the flywheel 10 in the second compressed state of the spring portion 133. Thereafter, the input shaft 20 is spline-fitted from one axial side, with the spline portion 21 of the input shaft 20 splined to the spline portion 12 of the flywheel 10 through the spline portion 135 of the biasing member 130, and the input shaft 20 is assembled to the flywheel 10 by spline fitting.

[0133] Fig. 24 is a diagram showing a state in which the urging member and the temporary fixing member are attached to the flywheel. When assembling the input shaft 20 to the flywheel 10 by spline-fitting, the urging member 130 is attached to the flywheel 10 by engaging the locking portion 134 of the urging member 130 with the fastening bolt B1 as shown in Fig. 24. The urging member 130 is attached so that the spline portion 135 approximately matches the spline portion 12 of the flywheel 10.

[0134] A temporary fastening member 140 is arranged on one axial side of the urging member 130, and with the hook portion 141a of the temporary fastening member 140 fitted into the outer annular portion 131 of the urging member 130 and the temporarily fastened portion 136 of the urging member 130 arranged in the recess 146 of the temporary fastening member 140, the fixing portion 141 of the temporary fastening member 140 is fixed to the outer annular portion 131 by welding or the like, and the temporary fastening member 140 is attached.

[0135] The temporary fixing member 140 attached to the biasing member 130 moves the temporarily fixed portion 136 of the biasing member 130 in the other rotational direction to compress the spring portion 133 of the biasing member 130, and elastically displaces the radial extension portion 144 in one axial direction while the spring portion 133 of the biasing member 130 is compressed to the second compressed state, thereby bringing the temporarily fixed portion 136 of the biasing member 130 into contact with the abutment portion 145 of the temporary fixing portion 142, thereby temporarily fixing the biasing member 130.

[0136] Fig. 25 is an explanatory diagram for explaining the assembly of the input shaft to the flywheel. Next, as shown in Fig. 25, the input shaft 20 is assembled from one axial side so that the spline portion 21 is spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 135 of the biasing member 130.

[0137] When the input shaft 20 is spline-fitted to the flywheel 10, the release operating portion 22 of the input shaft 20 abuts against the radial extension portion 144 of the temporary fastening member 140, and as the input shaft 20 moves in the other axial direction, the radially inner side of the temporary fastening main body portion 143 of the temporary fastening member 140 is moved in the other axial direction by the release operating portion 22, and the temporary fastening portion 142 is moved in the other axial direction.

[0138] 23, when the temporary fastening portion 142 is moved toward the other axial side, a biasing force F1 acts on one side of the rotation direction from the temporarily fastened portion 136 of the biasing member 130 to the abutting portion 145 of the temporary fastening portion 142 due to the spring portion 133 of the biasing member 130 in a compressed state. The temporary fastening portion 142 is pressed by the biasing force F1 with a pressing force F2 in a direction perpendicular to the inclined surface portion of the abutting portion 145 at the contact portion between the temporarily fastened portion 136 and the abutting portion 145.

[0139] The inclined surface portion 145 formed on the abutment portion 145 converts the biasing force F1 by the spring portion 133 of the biasing member 130 into a force F2a in a direction to release the temporary fastening of the biasing member 130 to the flywheel 10. The inclined surface portion 145 formed on the abutment portion 145 inclines toward one side in the rotational direction as it approaches one side in the axial direction, and constitutes an assist mechanism that assists the release operation portion 22 of the input shaft 20 in releasing the temporary fastening of the biasing member 130.

[0140] When the input shaft 20 is moved in the other axial direction by the release operating unit 22 until the temporary fastening portion 142 is moved in the other axial direction until the temporarily fastened portion 136 is positioned within the recess 146 without contacting the recess 146, the temporary fastening of the biasing member 130 to the flywheel 10 is released by the release operating unit 22, and the input shaft 20 is assembled to the flywheel 10 by spline fitting.

[0141] When the input shaft 20 is moved to the other axial direction until the temporary fastening portion 136 is positioned within the recess 146, the inner annular portion 132 of the urging member 130 moves to one side in the rotational direction relative to the outer annular portion 131 due to the spring portion 133, and the urging member 130 is engaged with the flywheel 10 and, in the first compressed state of the spring portion 133, the spline portion 135 engages with the spline portion 21 of the input shaft 20, urging the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

[0142] In the power transmission device 106, at the spline engagement portion where the spline portion 12 of the flywheel 10 and the spline portion 21 of the input shaft 20 are spline-engaged, the input shaft 20 is urged in one rotational direction by the biasing member 130, the other rotational side of the teeth of the spline portion 21 of the input shaft 20 engages with one rotational side of the teeth of the spline portion 135 of the biasing member 130, and the one rotational side of the teeth of the spline portion 21 of the input shaft 20 engages with the other rotational side of the teeth of the spline portion 12 of the flywheel 10.

[0143] In this way, the power transmission device 106 also uses a biasing member 130 that biases the input shaft 20 in the rotational direction relative to the flywheel 10, and a temporary fixing member 140 that temporarily fixes the biasing member 130 to the flywheel 10, and the biasing member 130 biases the input shaft 20 to one side in the rotational direction relative to the flywheel 10, thereby suppressing the teeth rattle noise of the spline engagement portion between the flywheel 10 and the input shaft 20.

[0144] For the power transmission device 106, the biasing member 130 is attached by engaging it with the flywheel 10, the temporary fastening member 140 is attached to the flywheel 10 and the biasing member 130, and the biasing member 130 is temporarily fastened to the flywheel 10 with the spring portion 133 in a compressed state, and the input shaft 20 is spline-fitted to the flywheel 10 for assembly, thereby making it possible to assemble the input shaft 20 to the flywheel 10 by spline-fitting with good assembly ease.

[0145] In the power transmission device 106, the temporary fastening member 140 may be fixed to and attached to the biasing member 130 before the biasing member 130 is engaged and attached to the flywheel 10, or may be fixed to and attached to the biasing member 130 after the biasing member 130 is engaged and attached to the flywheel 10.

[0146] In this embodiment, the biasing member 130 is configured to bias the input shaft 20 in one direction relative to the flywheel 10 in the rotational direction, but the biasing member 130 may also bias the input shaft 20 in the other direction relative to the flywheel 10.

[0147] The biasing member 130 has a spring portion 133 that is compressible in the rotational direction, and is formed so as to bias the input shaft 20 to one side in the rotational direction relative to the flywheel 10 when the spring portion 133 is in a first compressed state, and the temporary fixing member 140 is formed so as to temporarily fix the biasing member 130 to the flywheel 10 when the spring portion 133 is in a second compressed state in which it is more compressed than the first compressed state. The spring portion 133 is configured so as to be elastically displaceable in the compression direction in the rotational direction, but it is also possible to configure it so as to be elastically displaceable in the tension direction in the rotational direction.

[0148] In this manner, in the power transmission device 106 according to this embodiment, when the first and second power transmission members 10, 20 are assembled by spline fitting, a biasing member 130 is engaged with the first power transmission member 10 and, in a first elastic displacement state of the spring portion 133, the spline portion 135 engages with the spline portion 21 of the second power transmission member 20 to bias the second power transmission member 20 in one direction in the rotational direction relative to the first power transmission member 10, and a temporary fastening member 140 having a temporary fastening portion 142 that temporarily fastens the biasing member 130 to the first power transmission member 10 in a second elastic displacement state in which the spring portion 133 is elastically displaced from the first elastic displacement state is used, and a release operation portion 22 is provided on one axial side of the spline portion 21 of the second power transmission member 20 to release the temporary fastening of the biasing member 130 to the first power transmission member 10 by the temporary fastening portion 142.

[0149] As a result, the biasing member 130 is attached by engaging it with the first power transmission member 10, the temporary fastening member 140 is attached to the first power transmission member 10 and the biasing member 30 to temporarily fasten the biasing member 130 to the first power transmission member 10 in the second elastic displacement state of the spring portion 133, and the spline portion 21 of the second power transmission member 20 is spline-fitted with the spline portion 12 of the first power transmission member 10 through the spline portion 135 of the biasing member 130 to assemble the second power transmission member 20 to the first power transmission member 10, whereby the temporary fastening of the biasing member 130 to the first power transmission member 10 by the temporary fastening portion 142 of the temporary fastening member 140 is released and the second power transmission member 20 is biased to one side in the rotational direction relative to the first power transmission member 10, thereby suppressing the teeth rattle noise of the spline fitting portions of the first and second power transmission members 10, 20.

[0150] By engaging the biasing member 130 with the first power transmission member 10, temporarily fixing the biasing member 130 to the first power transmission member 10 with the temporary fixing member 140, and spline-fitting the second power transmission member 20 to the first power transmission member 10 without changing the shapes of the spline portions 12, 21 of the first and second power transmission members 10, 20, the second power transmission member 20 can be biased in one direction in the rotational direction relative to the first power transmission member 10, allowing for relatively easy assembly. Therefore, with a relatively simple configuration, it is possible to suppress rattle noise at the spline-fitted portions of the first and second power transmission members 10, 20 with good assembly ease.

[0151] In addition, the urging member 130 includes a spring portion 133, an engaging portion 134, a spline portion 135, an inner annular portion 132, an outer annular portion 131, and a temporarily fixed portion 136 that is temporarily fixed to the temporary fixing portion 142, and the engaging portion 134 is connected to the outer annular portion 131, and the spline portion 135 and the temporarily fixed portion 136 are connected to the inner annular portion 132. The spring portion 133 has one end connected to the outer annular portion 131 and the other end connected to the inner annular portion 132, and is elastically displaced in the rotational direction as the inner annular portion 132 moves to the other side of the rotational direction relative to the outer annular portion 131.

[0152] As a result, a biasing member 130 is used that has a spring portion 133 that is elastically displaced in the rotational direction when the inner annular portion 132 is moved toward the other side of the rotational direction relative to the outer annular portion 131.Therefore, there is no need to use a spring retaining member for retaining the spring, as in the case of using a spring as the biasing member 130, and assembly can be improved.

[0153] Moreover, the temporary fixing member 140 is fixedly attached to the outer annular portion 131 of the biasing member 130. This makes it possible to suppress rattling of the temporary fixing member 140 in the circumferential direction when the first and second power transmission members 10, 20 are assembled by spline fitting.

[0154] Furthermore, a plurality of temporary fastening members 140 are attached at equal intervals in the circumferential direction to the biasing member 130. As a result, the teeth rattle noise of the spline-fitted portions of the first and second power transmission members 10, 20 can be effectively suppressed by the plurality of temporary fastening members 140 attached at equal intervals in the circumferential direction to the biasing member 130.

[0155] Also, there is provided an assist mechanism 145 that assists the release operation of the release operation unit 22 in releasing the temporary fastening of the urging member 130. As a result, the assist mechanism 145 assists the release operation of the release operation unit 22 in releasing the temporary fastening of the urging member 130, so that the temporary fastening of the urging member 130 can be released relatively easily and the ease of assembling the second power transmission member 20 to the first power transmission member 10 can be improved.

[0156] In addition, the urging member 130 has a temporarily fixed portion 136 that is temporarily fixed to the temporarily fixed portion 142, and the temporarily fixed portion 142 has an abutment portion 145 that abuts against the temporarily fixed portion 136 on the other side of the rotational direction, and the abutment portion 145 is formed by an inclined surface portion 145 that inclines toward one side in the rotational direction as it approaches one side in the axial direction, and the assist mechanism 145 is composed of the inclined surface portion 145.

[0157] As a result, the inclined surface portion 145 formed on the abutment portion 145 of the temporary fastening portion 142 that constitutes the assist mechanism 145 inclines to one side in the rotational direction as it approaches one side in the axial direction, so that the biasing force applied to the abutment portion 145 of the temporary fastening portion 142 by the spring portion 133 of the biasing member 130 from the temporarily fastened portion 136 of the biasing member 130 to one side in the rotational direction can be converted into a force in a direction for releasing the temporary fastening of the biasing member 130 to the first power transmission member 10, thereby reducing the operating force for releasing the temporary fastening of the biasing member 130 and improving assembly ease.

[0158] Fig. 26 is a diagram showing a modified example of the biasing member according to the second embodiment. As shown in Fig. 26, as the spring portion of the biasing member 130, a spring portion 133' in which a second radially extending portion 133b' of the spring portion 133' is connected to a first arm portion 137 extending radially inward from the outer annular portion 131, so that one end side of the spring portion 133' is connected to the outer annular portion 131 may be used.

[0159] Fig. 27 is a diagram showing a modified example of the temporary fastening member according to the second embodiment. Similar to the temporary fastening member 140, the temporary fastening member 140' shown in Fig. 27 includes a fixing portion 141 fixed to the urging member 130, a temporary fastening portion 142 that temporarily fastens the urging member 130 to the flywheel 10, a temporary fastening main body portion 143 that connects the fixing portion 141 and the temporary fastening portion 142 and extends radially in a direction substantially perpendicular to the axial direction, and a radial extension portion 144 that extends radially inward from one circumferential side of the temporary fastening main body portion 143 beyond the temporary fastening portion 142.

[0160] The fixing portion 141 is also provided radially outside the temporary fixing main body portion 143 and fixed to the outer annular portion 131 by welding or the like, and has a hook portion 141a (see Figure 28) that is folded back in an inverted U-shape from one axial side of the outer annular portion 131, passing through the radial outside, and then radially inward, so that the hook portion 141a is fixed to the outer annular portion 131 with the hook portion 141a fitted into the radial outside of the outer annular portion 131.

[0161] In the temporary fixing member 140, the folded portion of the hook portion 141a and the temporary fixing main body portion 143 extend in parallel in the radial direction, but in the temporary fixing member 140', the folded portion of the hook portion 141a and the temporary fixing main body portion 143 are formed to open at a predetermined angle θ4. The predetermined angle θ4 is set to an angle between 5 degrees and 10 degrees, for example.

[0162] Fig. 28 is an explanatory diagram for explaining the temporary fastening of the biasing member by the temporary fastening member. As shown in Fig. 28(a), in the temporary fastening member 140', the fixing part 141 is fixed to the biasing member 130 by welding or the like in a state in which the temporary fastening main body part 143 is elastically displaced in the other axial direction so that the folded-back part of the hook part 141a and the temporary fastening main body part 143 are parallel to each other. As a result, the temporary fastening member 140' is configured such that the radially inner side of the temporary fastening main body part 143 can move in the one axial direction by elastic force with respect to the fixing part 141, and the temporary fastening part 142 and the radial extension part 144 can move in the one axial direction.

[0163] The temporary fixing portion 142 and the radially extending portion 144 are movable axially to one side relative to the fixed portion 141 by the elastic force of the temporary fixing member 140', but the temporarily fixed portion 136 of the biasing member 130 is restricted from moving axially to one side by the side surface on the other axial side of the recess 146 of the temporary fixing member 140'.

[0164] Then, as shown in FIG. 28(b), when the temporarily fixed portion 136 of the urging member 130 is moved to the other side in the rotational direction by an operator or the like and the spring portion 133 of the urging member 130 is compressed, the temporary fixing portion 142 and the radially extending portion 144 are moved to one axial side relative to the fixed portion 141 by the elastic force of the temporary fixing member 140', and the temporary fixing portion 142 temporarily fixes the urging member 130 in a second compressed state in which the spring portion 133 of the urging member 130 is compressed more than the first compressed state.

[0165] In this way, the temporary fastening member 140' has a fixed portion 141 fixed to the biasing member 130, a temporary fastening portion 142, and a connection portion 143 that connects the fixed portion 141 and the temporary fastening portion 142 and fixes the fixed portion 141 to the biasing member 130 with the temporary fastening portion 142 elastically displaced toward the other axial direction relative to the fixed portion 141, and the temporary fastening portion 142 may be configured to move due to an elastic force toward one axial direction relative to the fixed portion 141 fixed to the biasing member 130, so that the temporary fastening portion 142 temporarily fastens the biasing member 130.

[0166] Even in such a case, by using a temporary fastening member 140' configured so that the temporary fastening portion 142 moves by elastic force to one side in the axial direction relative to the fixed portion 141 fixed to the biasing member 130, the teeth rattle noise of the spline engagement portions of the first and second power transmission members 10, 20 can be suppressed, and circumferential rattle of the temporary fastening member 140' can be suppressed when the first and second power transmission members 10, 20 are spline-engaged and assembled.

[0167] Fig. 29 is a perspective view of a power transmission device according to a third embodiment of the present invention, Fig. 30 is an exploded perspective view of the power transmission device, Fig. 31 is a front view of a biasing member, Fig. 32 is a front view of the biasing member and the temporary fastening member, and Fig. 33 is a perspective view of the biasing member and the temporary fastening member. As with the power transmission device 6 according to the first embodiment, the power transmission device 206 according to the third embodiment includes a biasing member 230 and a temporary fastening member 240 arranged between the flywheel 10 and the input shaft 20, as shown in Figs. 29 to 33.

[0168] The biasing member 230 is disposed on one axial side of the flywheel 10, which is on the opposite side to the engine, the temporary fastening member 240 is disposed on one axial side of the biasing member 230, and the input shaft 20 is disposed on one axial side of the temporary fastening member 240. The biasing member 230 is formed in a substantially flat plate shape in a radial direction substantially perpendicular to the axial direction of the flywheel 10 and the input shaft 20. In this embodiment, the temporary fastening member 240 is divided into a plurality of parts, specifically four parts, at equal intervals in the circumferential direction.

[0169] As shown in Fig. 30, the flywheel 10 has a protruding portion 11 on the radial center side, and a spline portion 12 is formed in the radial center. The flywheel 10 has a first opening 13 as a locked portion 13 to which the urging member 230 is locked, and in this embodiment, the first opening 13 is formed as a screw hole. The first opening 13 is formed in a support portion 16 that extends radially outward from the protruding portion 11 of the flywheel 10 and supports the urging member 230. The flywheel 10 has a plurality of support portions 16, specifically four support portions 16, extending in the circumferential direction, which is the rotation direction, at equal intervals in the circumferential direction. The first opening 13 is formed in each of the support portions 16.

[0170] As shown in Figures 30 and 31, the biasing member 230 is formed in a circular ring shape extending in a plate-like manner in a direction perpendicular to the axial direction. The biasing member 230 includes an inner annular portion 232 disposed radially inward and formed in a circular ring shape, and an outer annular portion 231 disposed radially outward and formed in a circular ring shape, and the outer annular portion 231 is disposed concentrically radially outward from the inner annular portion 232. The outer annular portion 231 is disposed offset to the other axial side from the inner annular portion 232, and the outer annular portion 231 is provided with a flange portion 231b extending from the inner peripheral side to one axial side in a substantially cylindrical shape to the same axial position as the inner annular portion 232.

[0171] The urging member 230 also includes a spring portion 233 that can be pulled in the rotational direction, a locking portion 234 that is locked to the flywheel 10, a spline portion 235 that is spline-fitted to the input shaft 20, and a temporarily fixed portion 236 that is temporarily fixed to the temporary fixing member 240. The spline portion 235 is formed on the inner circumferential surface of the inner annular portion 232 and is connected to the inner annular portion 232.

[0172] The spring portion 233 of the biasing member 230 includes a first radial extension portion 233a extending radially outward in a straight line from the inner annular portion 232, a second radial extension portion 233b extending radially inward from the outer annular portion 231 in a straight line approximately parallel to the first radial extension portion 233a, a third radial extension portion 233c extending radially in a straight line approximately parallel to the first and second radial extension portions 233a, 233b, an outer connecting portion 233d extending in an arc shape connecting the radial outer sides of the first and third radial extension portions 233a, 233c, and an inner connecting portion 233e extending in an arc shape connecting the radial inner sides of the third and second radial extension portions 233c, 233b.

[0173] The spring portion 233 has one end connected to the outer annular portion 231 and the other end connected to the inner annular portion 232, and is formed in a substantially S-shape when viewed from the other axial direction side. The spring portion 233 is configured so that, when the inner annular portion 232 is moved to the other rotational direction side relative to the outer annular portion 231, the first radial extension portion 233a is moved to the other rotational direction side relative to the second radial extension portion 233b, thereby allowing the spring portion 233 to be pulled in the rotational direction.

[0174] The locking portion 234 of the urging member 230 is composed of an outer annular portion 231 and a fastening bolt B2 (see FIG. 30) that is inserted from one axial side into a bolt insertion hole 231a provided in the outer annular portion 231. The fastening bolt B2 is screwed into the first opening 13 of the flywheel 10, so that the urging member 230 is locked and fixed to the flywheel 10.

[0175] The temporarily fixed portion 236 of the biasing member 230 is provided on the tip side of an arm portion 238 extending radially outward in a substantially straight line from the inner annular portion 232 on the other side in the rotational direction of the spring portion 233. The arm portion 238 extends radially outward from the inner annular portion 232 in a substantially rectangular cross section, and is formed so that the tip side where the temporarily fixed portion 236 is provided is substantially flush with the outer annular portion 231. The outer annular portion 231 is formed with a notch 231c that is cut out in a substantially rectangular shape from the radially inner side to the radially outer side when viewed from the axial direction, and the temporarily fixed portion 236 and the temporarily fixed portion 242 are arranged within the notch 231c.

[0176] A plurality of spring portions 233, locking portions 234 and temporarily fastened portions 236, specifically four of them, are formed at equal intervals in the circumferential direction of biasing member 230. Locking portion 234 is disposed at a position overlapping with spring portion 233 in the rotational direction, and temporarily fastened portion 236 is disposed on the other side of spring portion 233 in the rotational direction.

[0177] The biasing member 230 is engaged with the flywheel 10, and in a first tension state of the spring portion 233 in which the inner annular portion 232 is moved to the other side in the rotational direction relative to the outer annular portion 231, the spline portion 235 engages with the spline portion 21 of the input shaft 20, thereby biasing the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

[0178] In this embodiment, the temporary fastening member 240 is configured by four temporary fastening members 240 arranged at equal intervals in the circumferential direction, as shown in Fig. 30. The temporary fastening member 240 is formed of a plate-shaped member, and includes a fixing portion 241 fixed to the urging member 230, a temporary fastening portion 242 that temporarily fastens the urging member 230 to the flywheel 10, and a temporary fastening main body portion 243 that connects the fixing portion 241 and the temporary fastening portion 242 and extends in the circumferential direction, as shown in Fig. 32 and Fig. 33. The temporary fastening main body portion 243 functions as a connecting portion that connects the fixing portion 241 and the temporary fastening portion 242.

[0179] The temporary fixing main body portion 243 is formed in a substantially U-shape and includes a first circumferential extension portion 243a arranged on the other axial side and extending in the circumferential direction, a second circumferential extension portion 243b arranged on one axial side and extending in the circumferential direction, and a connecting portion 243c extending in an arc shape connecting one rotational side, which is one circumferential end side, of the first and second circumferential extension portions 243a, 243b.

[0180] The fixing portion 241 is provided on the other rotational side of the first circumferential extension portion 243a of the temporary fastening main body portion 243, and is arranged along one axial side of the outer annular portion 231 of the biasing member 230 and fixed to the outer annular portion 131 by welding or the like.

[0181] The temporary fastening portion 242 is provided on the other rotational direction side of the second circumferential extending portion 243b of the temporary fastening main body portion 243. The temporary fastening member 240 is configured such that the other rotational direction side of the second circumferential extending portion 243b of the temporary fastening main body portion 243 can be elastically displaced toward one axial direction relative to the fixed portion 241 by fixing the fixed portion 241 to the biasing member 230, and the temporary fastening portion 242 can be elastically displaced toward one axial direction.

[0182] The temporary fastening portion 242 extends from the other rotational direction side of the second circumferential extending portion 243b of the temporary fastening main body portion 243 to the other axial direction side, and is formed to temporarily fasten the urging member 230 to the flywheel 10 when the spring portion 233 of the urging member 230 is in a second tension state in which the spring portion 233 is tensioned from the first tension state. In this embodiment, the temporary fastening portion 242 is fixed to the urging member 230 engaged and fixed to the flywheel 10, thereby temporarily fastening the urging member 230 to the flywheel 10. The temporary fastening portion 242 is disposed at a position in the circumferential direction different from the support portion 16 formed on the flywheel 10 so as to avoid interference with the flywheel 10.

[0183] Fig. 34 is a cross-sectional view of the temporary fastening portion and its vicinity of the temporary fastening member shown in Fig. 33. As shown in Fig. 34, the temporary fastening portion 242 has, on the other side in the rotational direction, a contact portion 244 that contacts the temporarily fastened portion 236 of the biasing member 230, and a recess 245 that is recessed on one axial side of the contact portion 244 toward one side in the rotational direction.

[0184] The contact portion 244 is formed by an end face on the other side in the rotation direction of the temporary fastening portion 242 that extends linearly substantially parallel to the axial direction. The contact portion 244 may be formed by an inclined surface portion that inclines toward one side in the rotation direction as it approaches one side in the axial direction, similar to the above-described embodiment.

[0185] FIG. 35 is a diagram showing a state in which the urging member is temporarily fixed by the temporary fixing member. As shown in FIG. 35, the recess 245 of the temporary fixing portion 242 is formed by the end face on the other side of the rotation direction of the temporary fixing portion 242, and is formed to be recessed in a substantially trapezoidal shape on one side in the rotation direction. The side surface on one axial direction side of the recess 245 extends linearly in a direction perpendicular to the axial direction, and the side surface on the other axial direction side is formed to be inclined toward one axial direction side as it approaches one side in the rotation direction. The recess 245 is formed so that when the input shaft 20 is spline-fitted to the flywheel 10, the temporarily fixed portion 236 of the urging member 230 is disposed within the recess 245 without abutting against the recess 245. The recess 245 may be formed in a substantially rectangular shape similar to the temporary fixing member 140.

[0186] 34, the temporary fastening member 240 is provided with a guide portion 243d on the first circumferentially extending portion 243a of the temporary fastening main body portion 243, the guide portion 243d extending through the cutout portion 231c to the other axial side of the outer annular portion 231 and then extending to the other rotational side. The guide portion 243d is disposed on the other axial side of the temporarily fastened portion 236 of the biasing member 230 and guides the temporarily fastened portion 236 to move in the rotational direction. The guide portion 243d of the temporary fastening member 240 is provided radially inward from the temporary fastening portion 242.

[0187] As shown in Figure 35, when the other rotational side of the second circumferential extension portion 243b of the temporary fastening main body portion 243 relative to the fixed portion 241 is elastically displaced toward one axial direction by an operator or the like, the temporary fastening portion 242 is elastically displaced toward one axial direction, and the abutment portion 244 abuts against the temporarily fastened portion 236 of the biasing member 230, temporarily fastening the biasing member 230 in a second tensile state in which the spring portion 233 of the biasing member 230 is stretched more than the first tensile state.

[0188] 29, the input shaft 20 has a spline portion 21 on the outer circumferential surface on the other axial side. The spline portion 21 has splines whose teeth extend in the axial direction, and is formed to be spline-fitted with the spline portion 12 of the flywheel 10 and the spline portion 235 of the biasing member 230.

[0189] A release operation portion 22' is provided on one axial side of the spline portion 21 of the input shaft 20 to release the temporary fastening of the urging member 230 to the flywheel 10 by the temporary fastening portion 242 of the temporary fastening member 240. In this embodiment, the release operation portion 22' is provided on the transmission case 5 that rotatably supports the input shaft 20, and is formed on a vertical wall portion 5a extending radially inward from the outer periphery of the transmission case 5.

[0190] The release operating portion 22' is formed so that when the spline portion 21 of the input shaft 20 is inserted through the radial center side of the temporary fastening member 240 from one axial side of the temporary fastening member 240 and spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 235 of the biasing member 230, in the first tension state of the spring portion 233, the spline portion 235 of the biasing member 230 engages with the spline portion 21 of the input shaft 20 to bias the input shaft 20 to one rotational side relative to the flywheel 10.

[0191] In the power transmission device 206, the biasing member 230 is attached to the flywheel 10 by engaging it from one axial side, and a temporary fixing member 240 is attached to the biasing member 230 from one axial side, and the biasing member 230 is temporarily fixed to the flywheel 10 in the second tension state of the spring portion 233. Thereafter, the input shaft 20 is spline-fitted from one axial side, with the spline portion 21 of the input shaft 20 splined to the spline portion 12 of the flywheel 10 through the spline portion 235 of the biasing member 230, and the input shaft 20 is assembled to the flywheel 10 by being spline-fitted.

[0192] Fig. 36 is a diagram showing a state in which the urging member and the temporary fixing member are attached to the flywheel. When assembling the input shaft 20 to the flywheel 10 by spline-fitting, the urging member 230 is attached to the flywheel 10 by engaging the locking portion 234 of the urging member 230 with the fastening bolt B2 as shown in Fig. 36. The urging member 230 is attached so that the spline portion 235 approximately matches the spline portion 12 of the flywheel 10.

[0193] A temporary fastening member 240 is arranged on one axial side of the urging member 230, and with the first circumferential extension portion 243a of the temporary fastening main body portion 243 overlapped with the outer annular portion 231 and the temporarily fastened portion 236 of the urging member 230 arranged within the recess 245 of the temporary fastening member 240, the fixing portion 241 of the temporary fastening member 240 is fixed to the outer annular portion 131 by welding or the like, and the temporary fastening member 240 is attached.

[0194] The temporary fixing member 240 attached to the biasing member 230 moves the temporarily fixed portion 236 of the biasing member 230 to the other side in the rotational direction, thereby elastically displacing the second circumferential extension portion 243b to one axial side in a state in which the spring portion 233 of the biasing member 230 is tensioned, and with the spring portion 233 of the biasing member 230 tensioned to the second tension state, the temporarily fixed portion 236 of the biasing member 230 is abutted against the abutment portion 244 of the temporary fixing portion 242, thereby temporarily fixing the biasing member 230.

[0195] Fig. 37 is an explanatory diagram for explaining the assembly of the input shaft to the flywheel. Next, as shown in Fig. 37, the input shaft 20 is assembled from one axial side so that the spline portion 21 is spline-fitted to the spline portion 12 of the flywheel 10 via the spline portion 235 of the biasing member 230.

[0196] When the input shaft 20 is spline-fitted to the flywheel 10, the release operating portion 22' provided on the transmission case 5, which moves in the other axial direction together with the input shaft 20, abuts against the second circumferential extension portion 243b of the temporary fastening member 240, and as the input shaft 20 moves in the other axial direction, the other rotational side of the second circumferential extension portion 243b of the temporary fastening member 240 is moved in the other axial direction by the release operating portion 22', and the temporary fastening portion 242 is moved in the other axial direction.

[0197] When the input shaft 20 is moved in the other axial direction by the release operating portion 22' until the temporary fastening portion 242 is moved in the other axial direction until the temporarily fastened portion 236 is positioned within the recess 245 without contacting the recess 245, the temporary fastening of the biasing member 230 to the flywheel 10 is released by the release operating portion 22', and the input shaft 20 is assembled to the flywheel 10 by spline fitting.

[0198] When the input shaft 20 is moved to the other axial direction until the provisionally fixed portion 236 is positioned within the recess 245, the inner annular portion 232 of the urging member 230 moves to one side in the rotational direction relative to the outer annular portion 231 due to the spring portion 233, and the urging member 230 is engaged with the flywheel 10 and, in the first tension state of the spring portion 233, the spline portion 235 engages with the spline portion 21 of the input shaft 20, urging the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

[0199] As for the power transmission device 206, at the spline engagement portion where the spline portion 12 of the flywheel 10 and the spline portion 21 of the input shaft 20 are spline-engaged, the input shaft 20 is urged in one rotational direction by the biasing member 230, the other rotational side of the teeth of the spline portion 21 of the input shaft 20 engages with one rotational side of the teeth of the spline portion 235 of the biasing member 230, and the one rotational side of the teeth of the spline portion 21 of the input shaft 20 engages with the other rotational side of the teeth of the spline portion 12 of the flywheel 10.

[0200] In this way, the power transmission device 206 also uses a biasing member 230 that biases the input shaft 20 in the rotational direction relative to the flywheel 10, and a temporary fixing member 240 that temporarily fixes the biasing member 230 to the flywheel 10, and the biasing member 230 biases the input shaft 20 to one side in the rotational direction relative to the flywheel 10, thereby suppressing the teeth rattle noise of the spline engagement portion between the flywheel 10 and the input shaft 20.

[0201] In the power transmission device 206, the biasing member 230 is attached by engaging it with the flywheel 10, the temporary fastening member 240 is attached to the flywheel 10 and the biasing member 230 to temporarily fasten the biasing member 230 to the flywheel 10 with the spring portion 233 in a tensile state, and the input shaft 20 supported by the transmission case 5 is spline-fitted to the flywheel 10 for assembly, thereby making it possible to assemble the input shaft 20 to the flywheel 10 by spline-fitting with good assembly ease.

[0202] In the power transmission device 206, the temporary fastening member 240 may be fixed to and attached to the biasing member 230 before the biasing member 230 is engaged and attached to the flywheel 10, or may be fixed to and attached to the biasing member 230 after the biasing member 230 is engaged and attached to the flywheel 10.

[0203] In this embodiment, the biasing member 230 is configured to bias the input shaft 20 in one direction relative to the flywheel 10 in the rotational direction, but the biasing member 230 may also bias the input shaft 20 in the other direction relative to the flywheel 10.

[0204] The biasing member 230 has a spring portion 233 that can be pulled in the rotational direction, and is formed so as to bias the input shaft 20 to one side in the rotational direction relative to the flywheel 10 when the spring portion 233 is in a first tension state. The temporary fixing member 240 is formed so as to temporarily fix the biasing member 230 to the flywheel 10 when the spring portion 233 is in a second tension state in which it is pulled further than the first tension state. The spring portion 233 is configured so as to be elastically displaceable in the tension direction in the rotational direction, but it is also possible to configure it so as to be elastically displaceable in the compression direction in the rotational direction.

[0205] The biasing member 230 has a spring portion that is compressible in the rotational direction, and is formed so as to bias the input shaft 20 in one direction of rotation relative to the flywheel 10 when the spring portion is in a first compressed state, and the temporary fixing member 240 can also be formed so as to temporarily fix the biasing member 230 to the flywheel 10 when the spring portion is in a second compressed state in which it is more compressed than the first compressed state.

[0206] In this case, the spring portion is compressed in the rotational direction by moving the inner annular portion 232 relative to the outer annular portion 231 in the other direction of the rotational direction, and the release operating portion 22' provided on one axial side of the spline portion 21 of the input shaft 20 is configured to release the temporary fastening of the urging member 230 to the flywheel 10 by the temporary fastening portion of the temporary fastening member 240 so that when the spline portion 21 of the input shaft 20 is spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 235 of the urging member 230, in a first compressed state of the spring portion, the spline portion 235 of the urging member 230 engages with the spline portion 21 of the input shaft 20 to urge the input shaft 20 to one direction in the rotational direction relative to the flywheel 10.

[0207] In this manner, in the power transmission device 206 according to this embodiment, when the first and second power transmission members 10, 20 are assembled by spline fitting, a biasing member 230 is engaged with the first power transmission member 10 and, in a first elastic displacement state of the spring portion 233, the spline portion 235 engages with the spline portion 21 of the second power transmission member 20 to bias the second power transmission member 20 in one direction in the rotational direction relative to the first power transmission member 10, and a temporary fastening member 240 having a temporary fastening portion 242 that temporarily fastens the biasing member 230 to the first power transmission member 10 in a second elastic displacement state in which the spring portion 233 is elastically displaced from the first elastic displacement state is used, and a release operating portion 22' is provided on one axial side of the spline portion 21 of the second power transmission member 20 to release the temporary fastening of the biasing member 230 to the first power transmission member 10 by the temporary fastening portion 242.

[0208] As a result, the biasing member 230 is attached by engaging it with the first power transmission member 10, the temporary fastening member 240 is attached to the first power transmission member 10 and the biasing member 30 to temporarily fasten the biasing member 230 to the first power transmission member 10 in the second elastic displacement state of the spring portion 233, and the spline portion 21 of the second power transmission member 20 is spline-fitted to the spline portion 12 of the first power transmission member 10 through the spline portion 235 of the biasing member 230 to assemble the second power transmission member 20 to the first power transmission member 10, whereby the temporary fastening of the biasing member 230 to the first power transmission member 10 by the temporary fastening portion 242 of the temporary fastening member 240 is released and the second power transmission member 20 is biased to one side in the rotational direction relative to the first power transmission member 10, thereby suppressing the teeth rattle noise of the spline fitting portions of the first and second power transmission members 10, 20.

[0209] By engaging the biasing member 230 with the first power transmission member 10, temporarily fixing the biasing member 230 to the first power transmission member 10 with the temporary fixing member 240, and spline-fitting the second power transmission member 20 to the first power transmission member 10 without changing the shapes of the spline portions 12, 21 of the first and second power transmission members 10, 20, the second power transmission member 20 can be biased in one direction in the rotational direction relative to the first power transmission member 10, allowing for relatively easy assembly. Therefore, with a relatively simple configuration, it is possible to suppress rattle noise at the spline-fitted portions of the first and second power transmission members 10, 20 with good assembly ease.

[0210] In addition, the urging member 230 includes a spring portion 233, an engaging portion 234, a spline portion 235, an inner annular portion 232, an outer annular portion 231, and a temporarily fixed portion 236 that is temporarily fixed to the temporary fixing portion 242, and the engaging portion 234 is connected to the outer annular portion 231, and the spline portion 235 and the temporarily fixed portion 236 are connected to the inner annular portion 232. The spring portion 233 has one end connected to the outer annular portion 231 and the other end connected to the inner annular portion 232, and is elastically displaced in the rotational direction as the inner annular portion 232 moves in the other rotational direction relative to the outer annular portion 231.

[0211] As a result, a biasing member 230 is used that has a spring portion 233 that is elastically displaced in the rotational direction when the inner annular portion 232 is moved toward the other side of the rotational direction relative to the outer annular portion 231.Therefore, there is no need to use a spring retaining member for retaining the spring, as in the case of using a spring as the biasing member 230, and assembly can be improved.

[0212] Moreover, the temporary fastening member 240 is fixedly attached to the outer annular portion 231 of the biasing member 230. This makes it possible to suppress rattling of the temporary fastening member 240 in the circumferential direction when the first and second power transmission members 10, 20 are assembled by spline fitting.

[0213] Furthermore, a plurality of temporary fastening members 240 are attached at equal intervals in the circumferential direction to the biasing member 230. As a result, the teeth rattle noise of the spline-fitted portions of the first and second power transmission members 10, 20 can be effectively suppressed by the plurality of temporary fastening members 240 attached at equal intervals in the circumferential direction to the biasing member 230.

[0214] Further, the release operation portion 22' is provided on the case 5 which rotatably supports the second power transmission member 20. As a result, the temporary fastening of the biasing member 230 can be released by the release operation portion 22' provided on the case 5 which is moved together with the second power transmission member 20 to the other axial side, and the temporary fastening of the biasing member 230 can be released using the inertial mass of the case 5.

[0215] Fig. 38 is a diagram showing a modified example of the temporary fastening member according to the third embodiment. Similar to the temporary fastening member 240, the temporary fastening member 240' shown in Fig. 38 includes a fixing portion 241 fixed to the urging member 230, a temporary fastening portion 242 that temporarily fastens the urging member 230 to the flywheel 10, and a temporary fastening main body portion 243 that connects the fixing portion 241 and the temporary fastening portion 242 and extends in the circumferential direction.

[0216] The temporary fixing main body portion 243 also has a first circumferential extension portion 243a, a second circumferential extension portion 243b, and a connecting portion 243c that connects the first circumferential extension portion 243a and the second circumferential extension portion 243b and extends in an arc, and is formed in a roughly U-shape.

[0217] The fixing portion 241 is also provided on the other rotational side of the first circumferential extension portion 243a of the temporary fixing main body portion 243, and is arranged along one axial side of the outer annular portion 231 of the biasing member 230 so as to be fixed to the outer annular portion 131 by welding or the like.

[0218] In the temporary fixing member 240, the second circumferential extension portion 243b and the first circumferential extension portion 243a of the temporary fixing main body portion 243 extend in parallel in the circumferential direction, but in the temporary fixing member 240', the second circumferential extension portion 243b and the first circumferential extension portion 243a are formed to be spaced apart from each other by a predetermined angle θ5. The predetermined angle θ5 is set to an angle between 5 degrees and 10 degrees, for example.

[0219] Fig. 39 is an explanatory diagram for explaining the temporary fastening of the urging member by the temporary fastening member. As shown in Fig. 39(a), in the temporary fastening member 240', the fixing portion 241 is fixed to the urging member 230 by welding or the like in a state in which the second circumferential extension portion 243b of the temporary fastening main body portion 243 is elastically displaced to the other axial direction side so that the second circumferential extension portion 243b and the first circumferential extension portion 243a of the temporary fastening main body portion 243 are parallel to each other. As a result, the temporary fastening member 240' is configured such that the other side of the rotational direction of the second circumferential extension portion 232b of the temporary fastening main body portion 243 can move to one axial direction side by elastic force relative to the fixing portion 241, and the temporary fastening portion 242 can move to one axial direction side.

[0220] The temporary fixing portion 242 is capable of moving axially to one side relative to the fixed portion 241 due to the elastic force of the temporary fixing member 240', but the temporarily fixed portion 236 of the biasing member 230 is restricted from moving axially to one side by the side surface on the other axial side of the recess 245 of the temporary fixing member 240'.

[0221] Then, as shown in FIG. 39(b), when the temporarily fastened portion 236 of the urging member 230 is moved to the other side in the rotational direction by an operator or the like and the spring portion 233 of the urging member 230 is pulled, the temporary fastening portion 242 is moved to one axial side relative to the fixed portion 241 by the elastic force of the temporary fastening member 240', and the temporary fastening portion 242 temporarily fastens the urging member 230 in a second tensile state in which the spring portion 233 of the urging member 230 is pulled further than the first tensile state.

[0222] In this way, the temporary fastening member 240' has a fixing portion 241 fixed to the biasing member 230, a temporary fastening portion 242, and a connection portion 243 which connects the fixing portion 241 and the temporary fastening portion 242 and fixes the fixing portion 241 to the biasing member 230 with the temporary fastening portion 242 elastically displaced toward the other axial direction relative to the fixing portion 241, and the temporary fastening portion 242 may be configured so that the temporary fastening portion 242 moves toward one axial direction due to an elastic force relative to the fixing portion 241 fixed to the biasing member 230, and the temporary fastening portion 242 temporarily fastens the biasing member 230.

[0223] Even in such a case, by using a temporary fastening member 240' configured so that the temporary fastening portion 242 moves by elastic force to one side in the axial direction relative to the fixed portion 241 fixed to the biasing member 230, the teeth rattle noise of the spline engagement portions of the first and second power transmission members 10, 20 can be suppressed, and circumferential rattle of the temporary fastening member 240' can be suppressed when the first and second power transmission members 10, 20 are spline-engaged and assembled.

[0224] In the above-described embodiment, the flywheel 10 is used as the first power transmission member, and the input shaft 20 of the transmission 3 is used as the second power transmission member. However, when a damper device is connected to the flywheel 10, the same can be applied by using the output member of the damper device instead of the flywheel as the first power transmission member.

[0225] The present invention is not limited to the exemplified embodiments, and various improvements and design modifications are possible without departing from the gist of the present invention. [Industrial Applicability]

[0226] As described above, according to the present invention, it is possible to suppress the teeth rattle noise of the spline engagement portions of the first and second power transmission members with good assembly ease through a relatively simple configuration, and therefore the present invention may be suitably used in vehicles equipped with a power transmission device including first and second power transmission members that are assembled by spline engagement. [Explanation of symbols]

[0227] 5. Gearbox case 6,106,206 Power transmission device 10 Flywheel (first power transmission member) 12 Flywheel spline 20 Input shaft (second power transmission member) 21 Spline part of input shaft 22,22´ Release operation part 30,130,230 Pressurizing member 31,131,231 Outer annular part 32,132,232 Inner annulus 33,133,233 Spring part 34,134,234 Locking part 35,135,235 Spline part of biasing member 36,136,236 Temporarily fastened part 40,140,240 Temporary fastening material 41,143,243 Temporary fastening body part 42,142,242 Temporary fastening 43 Regulated part 44,145,244 Contact part 45,146,245 recess 141 Fixed part

Claims

1. A power transmission device including a first power transmission member and a second power transmission member that are assembled by spline fitting, a biasing member having a spring portion elastically displaceable in a rotational direction, a locking portion provided on one end of the spring portion and locked to the first power transmission member, and a spline portion provided on the other end of the spring portion, the biasing member being disposed on one axial side of the first power transmission member and locked to the first power transmission member, and the spline portion being engaged with a spline portion of the second power transmission member in a first elastically displaced state of the spring portion, biasing the second power transmission member in one rotational direction relative to the first power transmission member; a temporary fastening member disposed on one axial side of the biasing member and having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member when the spring portion is in a second elastic displacement state in which it is elastically displaced from the first elastic displacement state, a release operation portion is provided on one axial side of the spline portion of the second power transmission member, the release operation portion releasing the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion of the temporary fastening member such that, when the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member from one axial side of the temporary fastening member through the spline portion of the biasing member, the spline portion of the biasing member engages with the spline portion of the second power transmission member in the first elastic displacement state of the spring portion to bias the second power transmission member to one side in a rotational direction relative to the first power transmission member, A power transmission device characterized by:

2. the urging member includes the spring portion, the locking portion, the spline portion, an inner annular portion having an annular shape disposed radially inward, an outer annular portion having an annular shape disposed radially outward, and a temporarily fixed portion temporarily fixed to the temporarily fixing portion, The locking portion is connected to the outer annular portion, the spline portion and the temporarily fastened portion are connected to the inner annular portion, The spring portion has one end connected to the outer annular portion and the other end connected to the inner annular portion, and is elastically displaced in the rotational direction by the inner annular portion moving toward the other side in the rotational direction relative to the outer annular portion.

2. The power transmission device according to claim 1.

3. the temporary fastening member includes a temporary fastening main body portion into which a spline portion of the second power transmission member is inserted, and the temporary fastening portion extends from the temporary fastening main body portion to the other axial side, the temporary fastening portion has a restricted portion that is restricted by the first power transmission member on one side in a rotational direction, and a contact portion that abuts against the temporarily fastened portion on the other side in the rotational direction, and a recess that is recessed toward the one side in the rotational direction in an axial direction of the contact portion, The recess is formed such that, when the release operation portion releases the temporary fastening of the biasing member to the first power transmission member, the release operation portion of the second power transmission member moves the temporary fastening main body portion and the temporary fastening portion to the other axial side, and the temporarily fastened portion is disposed in the recess.

3. The power transmission device according to claim 2.

4. The release mechanism includes an assist mechanism that assists the release operation of the release operation unit in releasing the temporary fastening of the biasing member.

4. The power transmission device according to claim 1, wherein the first and second shafts are arranged in a first direction.

5. the biasing member includes a temporarily fixed portion that is temporarily fixed to the temporarily fixing portion, the temporary fastening portion has a restricted portion that is restricted by the first power transmission member on one side in a rotational direction, and a contact portion that contacts the temporary fastening portion on the other side in the rotational direction, the abutment portion is formed by an inclined surface portion that is inclined toward one side in the rotation direction as it approaches one side in the axial direction, The assist mechanism is constituted by the inclined surface portion.

5. The power transmission device according to claim 4.

6. The temporary fastening member is fixedly attached to the outer annular portion of the biasing member.

3. The power transmission device according to claim 2.

7. The temporary fastening members are attached to the biasing member at equal intervals in the circumferential direction.

7. The power transmission device according to claim 6.

8. The temporary fastening member has a fixing portion fixed to the urging member, the temporary fastening portion, and a connection portion that connects the fixing portion and the temporary fastening portion and fixes the fixing portion to the urging member in a state in which the temporary fastening portion is elastically displaced to the other axial direction relative to the fixing portion, and is configured such that the temporary fastening portion moves by an elastic force to one axial direction side relative to the fixing portion fixed to the urging member, and the temporary fastening portion temporarily fastens the urging member.

8. The power transmission device according to claim 6 or 7.

9. The release operation portion is provided on a case that rotatably supports the second power transmission member.

9. The power transmission device according to claim 6, wherein the first and second shafts are arranged in a first direction.

10. The release mechanism includes an assist mechanism that assists the release operation of the release operation unit in releasing the temporary fastening of the biasing member.

10. The power transmission device according to claim 6, wherein the first and second shafts are arranged in a first direction.

11. the biasing member includes a temporarily fixed portion that is temporarily fixed to the temporarily fixing portion, the temporary fastening portion has a contact portion that contacts the temporarily fastened portion on the other side in the rotational direction, the abutment portion is formed by an inclined surface portion that is inclined toward one side in the rotation direction as it approaches one side in the axial direction, The assist mechanism is constituted by the inclined surface portion.

11. The power transmission device according to claim 10.

12. the first power transmission member is a flywheel connected to an output shaft of an engine, The second power transmission member is an input shaft of a transmission.

12. A power transmission device according to claim 1, wherein the power transmission device comprises:

13. 1. A method for assembling a power transmission device including a first power transmission member and a second power transmission member that are assembled by spline fitting, comprising the steps of: a step of attaching a biasing member having a spring portion elastically displaceable in a rotational direction, a locking portion provided on one end of the spring portion and locked to the first power transmission member, and a spline portion provided on the other end of the spring portion, the spline portion engaging with the spline portion of the second power transmission member in a first elastically displaced state of the spring portion to bias the second power transmission member in one rotational direction direction relative to the first power transmission member by locking the locking portion to the first power transmission member from one axial side; a step of attaching a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a second elastic displacement state in which the spring portion is elastically displaced from the first elastic displacement state to the first power transmission member and the biasing member from one axial side of the biasing member, thereby temporarily fastening the biasing member to the first power transmission member in the second elastic displacement state of the spring portion; and assembling the second power transmission member to the first power transmission member by spline-fitting the spline portion of the second power transmission member to the spline portion of the first power transmission member through the spline portion of the biasing member from one axial direction side of the temporary fastening member, A release operation portion is provided on one axial side of the spline portion of the second power transmission member, which releases the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion of the temporary fastening member so that, when the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member, the spline portion of the biasing member engages with the spline portion of the second power transmission member in the first elastic displacement state of the spring portion to bias the second power transmission member to one side in a rotational direction relative to the first power transmission member. A method for assembling a power transmission member comprising the steps of:

Images