power transmission device

Abstract

To reduce a tooth rattling sound in a spline fitting part of first and second power transmission members with favorable assembling performance.SOLUTION: A power transmission device 6 comprises: a base member 40 attached to a first power transmission member 10; an oscillation member 50 slidably supported to the base member 40; an energization member 60 for causing an engagement part to engage with the oscillation member 50 in a state where a spring part is in a compressed state, and fitting a spline part to a spline part of a second power transmission member 20; and a lock mechanism for causing the engagement part to engage with the oscillation member 50 in the state that the spring part is in the compressed state, and locking the energization member 60 to an energization position in which the second power transmission member 20 is energized to the first power transmission member 10 in a rotation direction. The lock mechanism is constituted so as to lock the energization member 60 to the energization position by an oscillation of the oscillation member 50 by a centrifugal force from a temporary lock position in which the engagement part engages with the oscillation member 50 in a non-compression state of the spring part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a 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 connected to the input shaft of the transmission in order to suppress vibrations caused by torque fluctuations in the engine.

[0003] In some cases, such as when a flywheel attached to the output shaft of an engine is spline-fitted to connect to the input shaft of a transmission, a first power transmission member and a second power transmission member that are rotatably arranged in the power transmission path from the drive source to the drive wheels may be assembled together by spline fitting.

[0004] When the spline portions of a first power transmission member and a second power transmission member, which are rotatably arranged in a power transmission path, are spline-fitted and assembled, a rattle noise can 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 can cause noise inside the vehicle cabin.

[0005] In response to this, it has been considered to suppress 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 the rotational direction relative to the first power transmission member, and urges the spline portion of the second power transmission member in the rotational direction relative to the spline portion of the first power transmission member.

[0006] For example, Patent Document 1 discloses a mechanism in which a spring retaining member that holds a spring is engaged with a spline portion of a first power transmission member and attached to the first power transmission member, and then a second power transmission member is spline-fitted to the first power transmission member, and the engagement of the spring retaining member is released, thereby applying a rotational force between the first power transmission member and the second power transmission member. [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 device 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 the rotational direction relative to the first power transmission member, but because the spring retaining member is attached to the first power transmission member with the spring in a compressed state, it may be difficult to assemble the spring retaining member to the first power transmission member.

[0009] An object of the present invention is to provide a power transmission device having first and second power transmission members that are assembled by spline engagement, and to suppress rattle noise at the spline engagement portions of the first and second power transmission members with good assembly ease. [Means for solving the problem]

[0010] The present invention provides a power transmission device having a first power transmission member and a second power transmission member assembled by spline engagement, the power transmission device comprising: a base member attached to the first power transmission member; a swinging member swingably supported by the base member; a spring portion compressible in a rotational direction; an engaging portion provided on one end of the spring portion and engaging with the swinging member; and a spline portion provided on the other end of the spring portion, wherein when the spring portion is in a compressed state, the engaging portion engages with the swinging member and the spline portion is fitted to the spline portion of the second power transmission member. Provided is a power transmission device comprising: a biasing member that biases the second power transmission member spline-fitted to the first power transmission member in a rotational direction; and a locking mechanism that locks the biasing member in a biasing position where the spring portion is compressed and the engaging portion engages with the oscillating member to bias the second power transmission member in the rotational direction relative to the first power transmission member, wherein the locking mechanism is configured to lock the biasing member from a temporary locking position where the spring portion is uncompressed and the engaging portion engages with the oscillating member, by centrifugal force of the oscillating member, to the biasing position.

[0011] According to the present invention, a power transmission device includes a base member attached to a first power transmission member, a swinging member swingably supported by the base member, a biasing member whose engaging portion engages with the swinging member when its spring portion is compressed and whose spline portion is fitted with a spline portion of a second power transmission member, and a locking mechanism that locks the biasing member in a biasing position where the engaging portion engages with the swinging member when the spring portion is compressed and biases the second power transmission member in a rotational direction relative to the first power transmission member. The locking mechanism is configured to lock the biasing member from a temporary locking position where the engaging portion engages with the swinging member when the spring portion is uncompressed to the biasing position when the swinging member swings by centrifugal force.

[0012] As a result, the locking mechanism locks the biasing member in a biasing position where it biases the second power transmission member in the rotational direction, thereby biasing the second power transmission member in the rotational direction relative to the first power transmission member and suppressing gear rattle noise.The locking mechanism is configured to lock the biasing member from a temporary fastening position where the spring portion engages with the oscillating member in an uncompressed state to the biasing position by centrifugal force, so that the biasing member can be assembled relatively easily with the spring portion in an uncompressed state, and the biasing member can be moved to and locked in the biasing position by centrifugal force due to rotation of the first power transmission member.This makes it possible to easily assemble the biasing member and suppress gear rattle noise at the spline-fitted portions of the first and second power transmission members.

[0013] The oscillating member has an axis portion supported on a base member so as to be oscillating, an engaged portion engaged with the engaging portion, and a connecting portion connecting the axis portion and the engaged portion, and the locking mechanism can be constituted by the engaging portion and the engaged portion.

[0014] According to this configuration, the oscillating member is provided with an axis portion that is oscillatably supported on the base member, an engaged portion that engages with the engaging portion, and a connecting portion that connects the axis portion and the engaged portion, and the locking mechanism is composed of the engaging portion and the engaged portion, so that the engaging portion of the urging member and the engaged portion of the oscillating member can lock the urging member from a temporary locking position in which the spring portion is in an uncompressed state to an urging position in which the spring portion is in a compressed state.

[0015] It is preferable that the engaging portion has one of an engaging protrusion that protrudes in the rotational direction and an engaging recess that is recessed in the rotational direction so as to be able to engage with the engaging protrusion, and the engaged portion has the other of the engaging protrusion and the engaging recess.

[0016] According to this configuration, the engaging portion is provided with either an engaging protrusion that protrudes in the rotational direction or an engaging recess that is recessed in the rotational direction so that it can engage with the engaging protrusion, and the engaged portion is provided with the other engaging protrusion or engaging recess, so that the engaging portion of the biasing member and the engaged portion of the oscillating member can be engaged with each other using a relatively simple configuration.

[0017] The engaging portion has an engaging protrusion that protrudes in the rotational direction, and the engaged portion has an engaging recess that is recessed in the rotational direction so as to be able to engage with the engaging protrusion, and the engaging recess has a first engaging recess and a second engaging recess that is arranged radially inward from the first engaging recess, and the engaging protrusion can engage with the first engaging recess in a temporary fastening position and can engage with the second engaging recess in a biased position.

[0018] According to this configuration, the locking mechanism is configured so that the engaging convex portion of the biasing member engages with the first engaging recess of the oscillating member in the temporary fastening position, and so that the engaging convex portion of the biasing member engages with the second engaging recess arranged radially inward of the oscillating member in the biased position. Therefore, the engaging convex portion of the biasing member and the first engaging recess and second engaging recess of the oscillating member can relatively easily lock the biasing member from the temporary fastening position to the biased position.

[0019] It is preferable that the engaged portion is provided with a mass portion that increases the centrifugal force.

[0020] According to this configuration, the engaged portion is provided with a mass portion that increases the centrifugal force, thereby increasing the centrifugal force acting on the swinging member and making it easier for the swinging member to swing. The centrifugal force of the swinging member can be adjusted by adjusting the weight of the mass portion provided on the swinging member.

[0021] It is preferable that a plurality of the swinging members are supported in the circumferential direction by the base member, and the biasing member has a plurality of engaging portions that respectively engage with the swinging members.

[0022] According to this configuration, the oscillating members are supported in multiple positions circumferentially on the base member, and the biasing member has multiple engagement portions that respectively engage with the oscillating members, so that the biasing member biases the second power transmission member in the circumferential direction relative to the first power transmission member in a balanced manner, thereby effectively suppressing gear rattle noise. [Effects of the Invention]

[0023] According to the power transmission device of the present invention, rattle noise caused by the spline-fitted portions of the first power transmission member and the second power transmission member can be suppressed with good assembly ease. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a schematic diagram of a power unit equipped with a power transmission device according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is a front view of the biasing unit in a temporary fastening position. [Figure 8] FIG. 10 is a front view of the biasing unit in the biasing position. [Figure 9] FIG. [Figure 10] 10 is a view showing a spline fitting portion where an input shaft is urged against a flywheel by an urging member. FIG. [Figure 11] FIG. 10 is a front view of a modified example of the biasing unit in a temporary fixing position. [Figure 12] FIG. 10 is a front view of a modified example of the biasing unit in the biased position. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0026] Fig. 1 is a schematic diagram of a power unit equipped with a power transmission device according to an embodiment of the present invention. As shown in Fig. 1, the power unit 1 equipped with the power transmission device according to an embodiment of the present invention is mounted on a vehicle such as a front-engine, rear-drive vehicle and is 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.

[0027] The automatic transmission 3 is arranged 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 a torque converter. The automatic transmission 3 includes an input shaft 20 rotatably supported in a transmission case 5.

[0028] Although not shown, the automatic transmission 3 includes a speed change mechanism having multiple planetary gear sets (planetary gear mechanisms) and multiple frictional engagement elements such as clutches and brakes, and an output shaft. The speed change mechanism is configured to selectively engage the multiple frictional engagement elements to switch the power transmission path that passes through each planetary gear set, thereby achieving a predetermined gear position according to the driving state of the vehicle.

[0029] 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 via the transmission mechanism.

[0030] 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 unit that is attached to the flywheel 10 and spline-engaged to the input shaft 20, and is configured to suppress rattle noise at the spline-engaged portion between the flywheel 10 and the input shaft 20 with ease of assembly.

[0031] Fig. 2 is a perspective view of the power transmission device, Fig. 3 is a side view of the power transmission device, and Fig. 4 is an exploded perspective view of the power transmission device. As shown in Figs. 2 to 4, the power transmission device 6, which is assembled by spline-fitting an input shaft 20 to a flywheel 10 rotatably provided in a power transmission path from an engine 2 to a drive wheel, includes a biasing unit 30 disposed between the flywheel 10 and the input shaft 20.

[0032] 3, the biasing unit 30 is disposed on one axial side of the flywheel 10, which is the side opposite to the engine, and the input shaft 20 is disposed on one axial side of the biasing unit 30. The biasing unit 30 is integrally assembled using a fastening bolt B1 and a nut N1.

[0033] As shown in FIG. 4, the biasing unit 30 includes a base member 40 attached to the flywheel 10, a swinging member 50 swingably supported on the base member 40, and a biasing member 60 that engages with the swinging member 50 and is spline-fitted to the input shaft 20, thereby biasing the input shaft 20 spline-fitted to the flywheel 10 in the rotational direction.

[0034] Although not shown, the flywheel 10 is fixed to the output shaft 4 of the engine 2 using fastening bolts, and is formed in an annular 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 at the radial center, and the protruding surface of the protruding portion 11 is formed as a flat surface in a direction substantially perpendicular to the axial direction. The flywheel 10 has a spline portion 12 formed in the radial center that is spline-fitted to the input shaft 20. The spline portion 12 has splines whose tooth traces extend in the axial direction, and is formed on the inner peripheral surface of the flywheel 10.

[0035] The flywheel 10 is formed with mounting portions 13 to which the base member 40 of the biasing unit 30 is attached. The mounting portions 13 are provided radially outward of the spline portion 12, and a plurality of mounting portions 13, specifically three mounting portions 13, are formed at equal intervals in the circumferential direction, which is the rotation direction of the flywheel 10. In this embodiment, the mounting portions 13 are formed in the flywheel 10 with screw holes 13.

[0036] Fig. 5 is a front view of the urging unit, Fig. 6 is an exploded perspective view of the urging unit, Fig. 7 is a front view of the urging unit in a temporary fastening position, and Fig. 8 is a front view of the urging unit in a urging position. Figs. 5 to 8 also show fastening bolts B2 that attach the urging unit 30 to the flywheel 10, and Figs. 7 and 8 show the urging unit 30 with the cover plate 43 removed. As shown in Figs. 5 to 8, the urging unit 30 includes a base member 40, a swinging member 50, and a urging member 60.

[0037] 6, the base member 40 includes a mounting plate 41 formed in a disk shape and extending like a plate in a direction perpendicular to the axial direction, and a ring member 42 formed in a ring shape with a predetermined thickness and disposed on one axial side of the mounting plate 41. The mounting plate 41 and ring member 42 are integrally assembled together with a disk-shaped cover plate 43 disposed on one axial side of the ring member 42 using a fastening bolt B1 and a nut N1.

[0038] The mounting plate 41 has an insertion hole 41a formed on the radial center side, through which the spline portion 21 of the input shaft 20 is inserted. A guide portion 41b extending in an arc shape in a plan view from the mounting plate 41 to one axial side is provided on the inner circumferential surface of the insertion hole 41a. A plurality of guide portions 41b, specifically three guide portions 41b, are provided at equal intervals in the circumferential direction and are configured to guide the biasing member 60.

[0039] The mounting plate 41 has first openings 41c formed radially outward of the insertion holes 41a as mounting portions 41c to be mounted on the flywheel 10. The first openings 41c are formed as elongated holes extending in the circumferential direction, through which the fastening bolts B2 are inserted. A plurality of first openings 41c, specifically three, are provided at equal intervals in the circumferential direction.

[0040] Second openings 41d are formed radially outward from the first openings 41c in the mounting plate 41. The second openings 41d are formed as bolt insertion holes 41d, through which fastening bolts B1 are inserted. A plurality of second openings 41d, specifically three second openings 41d, are provided at equal intervals in the circumferential direction.

[0041] The ring member 42 includes an annular main body 42a formed in a circular ring shape and disposed so as to face one axial side of the mounting plate 41, and a protrusion 42b protruding radially inward from the annular main body 42a in a generally trapezoidal shape. The protrusion 42b is formed with a bolt insertion hole 42c through which the fastening bolt B1 is inserted, and a support portion 42d is formed on the end face on one side in the rotational direction, recessed in a semicircular shape on the other side in the rotational direction. A plurality of protrusions 42b, specifically three protrusions 42b, are provided at equal intervals around the circumferential direction of the annular main body 42a.

[0042] The cover plate 43 is formed in a disk shape extending in a plate-like shape in a direction perpendicular to the axial direction. A bolt insertion hole 43a through which a fastening bolt B1 is inserted is formed in the cover plate 43. A plurality of bolt insertion holes 43a, specifically three bolt insertion holes 43a, are provided at equal intervals around the circumferential direction of the cover plate 43.

[0043] As shown in FIG. 5, in the biasing unit 30, the fastening bolt B1 inserted through the bolt insertion hole 41d, the bolt insertion hole 42c, and the bolt insertion hole 43a is screwed into the nut N1, whereby the mounting plate 41 and the ring member 42 are integrally assembled with the cover plate 43 with the oscillating member 50 and the biasing member 60 housed within the ring member 42.

[0044] The biasing unit 30 is attached to the flywheel 10 by adjusting the position of the mounting portion 41c of the mounting plate 41 so that it faces the mounting portion 13 of the flywheel, and threading the fastening bolt B2 into the screw hole 13 through the mounting portion 41c, which is formed in the shape of an elongated hole.

[0045] As shown in Fig. 6, the biasing member 60 extends in a plate shape in a direction perpendicular to the axial direction. As shown in Fig. 5, the biasing member 60 has an annular portion 61 disposed radially inward and formed in an annular shape. The biasing member 60 has a spring portion 62 that can be compressed in the rotational direction, an engagement portion 63 provided on one end of the spring portion 62 and engaging with the swinging member 50, and a spline portion 64 provided on the other end of the spring portion 62.

[0046] Fig. 9 is an enlarged view of a main portion of the urging unit. As shown in Fig. 9, the spline portion 64 of the urging member 60 has splines with tooth traces extending in the axial direction so as to fit into the spline portion 21 of the input shaft 20. The spline portion 64 of the urging member 60 is formed on the inner circumferential surface of the annular portion 61. The spline portion 64 of the urging member 60 engages with and urges the spline portion 21 of the input shaft 20, and the spline portion 21 can be formed with lower machining precision than those of the flywheel 10 and the input shaft 20.

[0047] The spring portion 62 includes a radially extending portion 62a extending linearly radially outward from the annular portion 61, a first circumferentially extending portion 62b connected to the radially extending portion 62a and extending circumferentially, and a second circumferentially extending portion 62c connected to the first circumferentially extending portion 62b and extending circumferentially radially outward from the first circumferentially extending portion 62b on the opposite side to the first circumferentially extending portion 62b.

[0048] In the spring portion 62, the connection portion between the radially extending portion 62a and the first circumferentially extending portion 62b is formed in an arc shape, and the connection portion between the first circumferentially extending portion 62b and the second circumferentially extending portion 62c is also formed in an arc shape. The spring portion 62 is formed in a substantially S-shape when viewed in the axial direction. One end of the spring portion 62, specifically the radially extending portion 62a, is connected to the annular portion 61, and the other end of the spring portion 62, specifically the second circumferentially extending portion 62c, is connected to the engaging portion 63.

[0049] The engaging portion 63 is provided on one end side of the spring portion 62 and has an engaging protrusion 63a that protrudes in the circumferential direction, which is the rotational direction. The engaging protrusion 63a is formed in a circular shape when viewed from the axial direction. The engaging portion 63 is configured so that the engaging protrusion 63a engages with the swinging member 50. A plurality of spring portions 62 and a plurality of engaging portions 63, specifically three, are formed at equal intervals in the circumferential direction of the biasing member 60.

[0050] The swinging member 50 has a shaft portion 51 swingably supported by the base member 40, an engaged portion 52 that engages with an engaging portion 63 of the biasing member 60, and a connecting portion 53 that connects the shaft portion 51 and the engaged portion 52. The shaft portion 51 is formed in a circular shape when viewed in the axial direction, and is fitted into a support portion 42d formed on the ring member 42. The swinging member 50 is swingably supported by the base member 40 by fitting the shaft portion 51 into the support portion 42d.

[0051] The connecting portion 53 extends with a predetermined width from the shaft portion 51 in the circumferential direction, which is the rotational direction of the flywheel 10 and the input shaft 20. The engaged portion 52 has an engaging recess 54 recessed in the circumferential direction, which is the rotational direction, on the end face opposite the connecting portion 53. The engaging recess 54 is formed so as to be able to engage with the engaging protrusion 63a.

[0052] The engaging recess 54 of the engaged portion 52 includes a first engaging recess 55 arranged radially outward in a direction perpendicular to the axial direction, and a second engaging recess 56 arranged radially inward from the first engaging recess 55. The first engaging recess 55 and the second engaging recess 56 are each formed to engage with the engaging protrusion 63a of the engaging portion 63, and the second engaging recess 56 is arranged radially inward from the first engaging recess 55 and on the other side in the rotational direction.

[0053] The first engagement recess 55 is formed in a substantially V-shape in plan view, with a first linear portion 55a extending linearly on the radially outer side and a second linear portion 55b extending linearly on the radially inner side. The second engagement recess 56 is formed with a curved portion 56a extending in an arc shape. The connection portion between the first engagement recess 55 and the second engagement recess 56 is formed so as to protrude toward the other side in the rotational direction.

[0054] The swinging member 50 has its shaft portion 51 supported by the support portion 42d and is swingably supported relative to the base member 40. When the flywheel 10 rotates in the other rotational direction, the swinging member 50 swings from the temporarily fixed position shown in Fig. 7 to the biased position shown in Fig. 8 due to centrifugal force acting on the swinging member 50 via the base member 40.

[0055] At the temporary fastening position, the biasing member 60 and the swinging member 50 are temporarily fastened together with the spring portion 62 in an uncompressed state, with the engaging portion 63 engaging with the engaged portion 52 and the engaging protrusion 63a engaging with the first engaging recess 55 of the engaging recess 54. As shown in Fig. 9, the engaged portion 52 of the swinging member 50 is provided with a restricting portion 59 that protrudes radially inward so that the biasing member 60 and the swinging member 50 engage at the temporary fastening position, and the restricting portion 59 abuts against the first circumferentially extending portion 62b of the spring portion 62 to restrict the biasing member 60 from rotating in one direction.

[0056] In the biasing position, the spline portion 21 of the input shaft 20 is fitted into the spline portion 12 of the flywheel 10, and the biasing member 60 and the oscillating member 50 are configured such that the spring portion 62 is in a compressed state and the engagement portion 63 engages with the oscillating member 50, biasing the input shaft 20 in one direction of rotation relative to the flywheel 10.

[0057] In the temporary locking position, the biasing member 60 and the rocking member 50 are engaged with the spring portion 62 in an uncompressed state. When a predetermined centrifugal force acts on the rocking member 50 via the base member 40 as the flywheel 10 rotates in the other direction of rotation, the centrifugal force causes the rocking member 50 to swing from the temporary locking position to the biasing position, and the biasing member 60 and the rocking member 50 are engaged with the spring portion 62 in a compressed state, thereby locking them together. The angle θ2 between the center of the engaging portion 63 and the center of the shaft portion 51 in the biasing position shown in FIG. 8 is larger than the angle θ1 between the center of the engaging portion 63 and the center of the shaft portion 51 in the temporary locking position shown in FIG. 7.

[0058] In this embodiment, the engaging portion 63 of the biasing member 60 and the engaged portion 52 of the swinging member 50 are configured so that the biasing member 60 is locked to the biased position when the swinging member 50 swings due to centrifugal force from a temporary locking position where the engaging portion 63 engages with the swinging member 50 when the spring portion 62 is in a non-compressed state. The engaging portion 63 and the engaged portion 52 constitute a locking mechanism 70 that locks the biasing member 60 to the biased position when the swinging member 50 swings due to centrifugal force from a temporary locking position where the engaging portion 63 engages with the swinging member 50 when the spring portion 62 is in a non-compressed state.

[0059] 9, a mass portion 57 that increases the centrifugal force is provided on the engaged portion 52 of the swinging member 50. The engaged portion 52 of the swinging member 50 is provided with a mass portion 57 that is formed in an arc shape radially outward of the engaged portion 52 and has a larger radial dimension than the connecting portion 53. The mass portion 57 functions as a weight portion that increases the centrifugal force acting on the swinging member 50.

[0060] The swinging member 50 has a shaft portion 51 disposed on the other rotational side and an engaged portion 52 disposed on one rotational side, and when the flywheel 10 rotates in the other rotational direction, the engaged portion 52 is swung and moved radially outward relative to the shaft portion 51 via the connecting portion 53 by centrifugal force. When the flywheel 10 reaches a predetermined rotation speed, for example, 2000 rpm, the swinging member 50 moves from the temporary locking position to the biased position and is locked in the biased position. The swinging member 50 is formed with a plurality of engaging portions 63, specifically three, spaced equally apart circumferentially so as to engage with the engaging portions 63 arranged circumferentially of the biasing member 60.

[0061] In this way, the locking mechanism 70, which is formed by the engaging portion 63 of the biasing member 60 and the engaged portion 52 of the oscillating member 50, is configured to lock the biasing member 60 from a temporary locking position in which the spring portion 62 is in an uncompressed state and the engaging portion 63 engages with the oscillating member 50, by the oscillating member 50 being oscillated by centrifugal force to the biased position.

[0062] The urging unit 30 is formed by placing the oscillating member 50 and the urging member 60 in a temporary fixing position within the ring member 42, and then positioning the mounting plate 41 and the cover plate 43 so that they sandwich the ring member 42, and assembling the mounting plate 41, the ring member 42 and the cover plate 43 together using the fastening bolt B1 and the nut N1.

[0063] In the power transmission device 6, with the mounting plate 41 of the biasing unit 30 positioned on one axial side of the flywheel 10, the biasing unit 30 is assembled to the flywheel 10 by threading the fastening bolt B2 into the screw hole 13, and then 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 64 of the biasing member 60, and the input shaft 20 is assembled to the flywheel 10 by spline-fitting.

[0064] When the input shaft 20 is assembled to the flywheel 10, the automatic transmission 3 is attached to the engine 2. When the biasing unit 30 is assembled to the flywheel 10, the spline portion 64 of the biasing unit 30 and the spline portion 12 of the flywheel 10 are arranged so that their splines approximately match.

[0065] When the input shaft 20 is assembled to the flywheel 10, the biasing member 60 is disposed in a temporary fixing position where the spring portion 62 is in an uncompressed state and the engagement portion 63 is engaged with the swinging member 50. Thereafter, when the engine 2 is operated to rotate the flywheel 10 in the other rotational direction and reach a predetermined rotation speed, the swinging member 50 is swung by centrifugal force, and the biasing member 60 is disposed in a biasing position where the spring portion 62 is in a compressed state and the engagement portion 63 is engaged with the swinging member 50, biasing the input shaft 20 in the other rotational direction relative to the flywheel 10. In this way, the biasing member 60 can be assembled relatively easily with the spring portion 62 in an uncompressed state.

[0066] Fig. 10 is a diagram showing a splined engagement portion where the input shaft is urged relative to the flywheel by an urging member. As shown in Fig. 10, at 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 in one direction of rotation by the urging member 60, the other side of the rotational direction of the teeth 21a of the splined portion 21 of the input shaft 20 engages with one side of the rotational direction of the teeth 64a of the splined portion 64 of the urging member 60, and the one side of the rotational direction of the teeth 21a of the splined portion 21 of the input shaft 20 engages with the other side of the rotational direction of the teeth 12a of the splined portion 12 of the flywheel 10.

[0067] In this way, the power transmission device 6 uses a biasing unit 30 that is attached to the flywheel 10 and fitted to the input shaft 20, and the biasing member 60 biases the input shaft 20 in one direction of rotation relative to the flywheel 10, thereby suppressing the teeth rattle noise at the spline fitting portion between the flywheel 10 and the input shaft 20.

[0068] In this embodiment, the engaging portion 63 of the urging member 60 has an engaging protrusion 63a that protrudes in the rotational direction, and the engaged portion 52 of the oscillating member 50 has an engaging recess 54 that is recessed in the rotational direction, but it is also possible for the engaged portion 52 of the oscillating member 50 to have an engaging protrusion that protrudes in the rotational direction, and the engaging portion 63 of the urging member 60 to have an engaging recess that is recessed in the rotational direction.

[0069] 11 is a front view of a modified example of the urging unit in the temporary fastening position. FIG. 12 is a front view of a modified example of the urging unit in the urging position. As shown in FIGS. 11 and 12, the urging unit 30 may be configured such that the engaged portion 52 of the swing member 50 includes an engaging protrusion 154 that protrudes in the rotational direction, and the engaging portion 63 of the urging member 60 includes an engaging recess 164 that is recessed in the rotational direction so as to be engageable with the engaging protrusion 154. In this case, the engaging recess 164 includes a first engaging recess 165 and a second engaging recess 166 that is disposed radially outward from the first engaging recess 165, and the engaging protrusion 154 is formed to engage with the first engaging recess 165 in the temporary fastening position and to engage with the second engaging recess 166 in the urging position.

[0070] 11, when the biasing member 60 is in a temporary fixing position where the spring portion 62 is in a non-compressed state and the engaging portion 63 is engaged with the swinging member 50, the engaging protrusion 154 engages with the first engaging recess 165. When the swinging member 50 is swung by centrifugal force, as shown in FIG. 12, when the spring portion 62 is in a compressed state and the engaging portion 63 is engaged with the swinging member 50 to bias the input shaft 20 in the rotational direction relative to the flywheel 10, the engaging protrusion 154 may engage with the second engaging recess 166.

[0071] In this embodiment, the biasing unit 30 is integrally assembled using a fastening bolt B1 and a nut N1, but it may also be assembled integrally using a rivet. Three oscillating members 50 are provided at equal intervals in the circumferential direction, but it is also possible to provide two or four or more oscillating members 50. When two oscillating members 50 are provided in the circumferential direction, the number of parts can be reduced and productivity can be improved.

[0072] In the urging unit 30, the mounting plate 41 and the ring member 42 are formed separately, but the mounting plate 41 and the ring member 42 may be formed integrally. The urging unit 30 includes a cover plate 43, but it is also possible to not include the cover plate 43.

[0073] As described above, the power transmission device 6 according to this embodiment includes the base member 40 attached to the first power transmission member 10, the swinging member 50 swingably supported by the base member 40, the biasing member 60 in which the engaging portion 63 engages with the swinging member 50 when the spring portion 62 is compressed and the spline portion 64 is fitted into the spline portion 21 of the second power transmission member 20, and a locking mechanism 70 that locks the biasing member 60 in a biasing position in which the engaging portion 63 engages with the swinging member 50 when the spring portion 62 is compressed and biases the second power transmission member 20 in the rotational direction relative to the first power transmission member 10. The locking mechanism 70 is configured to lock the biasing member 60 in the biasing position when the swinging member 50 swings due to centrifugal force from a temporary locking position in which the engaging portion 63 engages with the swinging member 50 when the spring portion 62 is uncompressed.

[0074] As a result, the locking mechanism 70 locks the biasing member 60 in a biasing position where it biases the second power transmission member 20 in the rotational direction, thereby biasing the second power transmission member 20 in the rotational direction relative to the first power transmission member 10 and suppressing gear rattle noise. The locking mechanism 70 is configured to lock the biasing member 60 from a temporary fastening position where the spring portion 62 engages with the oscillating member 50 in an uncompressed state to the biasing position by centrifugal force, so that the biasing member 60 can be assembled relatively easily with the spring portion 62 in an uncompressed state, and the biasing member 60 can be moved to and locked in the biasing position by centrifugal force due to rotation of the first power transmission member 10. Therefore, gear rattle noise at the spline-fitted portions of the first and second power transmission members 10, 20 can be suppressed with good assembly ease.

[0075] Furthermore, the swinging member 50 has a shaft portion 51 swingably supported on the base member 40, an engaged portion 52 engaged with the engaging portion 63, and a connecting portion 53 connecting the shaft portion 51 and the engaged portion 52, and the locking mechanism 70 is constituted by the engaging portion 63 and the engaged portion 52. As a result, the engaging portion 63 of the biasing member 60 and the engaged portion 52 of the swinging member 50 can lock the biasing member 60 from a temporary locking position where the spring portion 62 is in a non-compressed state to a biased position where the spring portion 62 is in a compressed state.

[0076] Further, the engaging portion 63 has one of an engaging protrusion 63a that protrudes in the rotational direction and an engaging recess 54 that is recessed in the rotational direction so as to be able to engage with the engaging protrusion 63a, and the engaged portion 52 has the other of the engaging protrusion 63a and the engaging recess 54. This allows the engaging portion 63 of the urging member 60 and the engaged portion 52 of the swinging member 50 to be engaged with each other using a relatively simple configuration.

[0077] Furthermore, the engaging portion 63 includes an engaging protrusion 63a that protrudes in the rotational direction, and the engaged portion 52 includes an engaging recess 54 that is recessed in the rotational direction so as to be able to engage with the engaging protrusion 63a, and the engaging recess 54 includes a first engaging recess 55 and a second engaging recess 56 that is disposed radially inward from the first engaging recess 55, and the engaging protrusion 63a engages with the first engaging recess 55 at the temporary fastening position and engages with the second engaging recess 56 at the urging position. This makes it relatively easy to lock the urging member 60 from the temporary fastening position to the urging position by the engaging protrusion 63a of the urging member 60 and the first engaging recess 55 and second engaging recess 56 of the swinging member 50.

[0078] Furthermore, a mass portion 57 that increases the centrifugal force is provided on the engaged portion 52. This increases the centrifugal force acting on the oscillating member 50, making it easier to oscillate the oscillating member 50. The centrifugal force of the oscillating member 50 can be adjusted by adjusting the weight of the mass portion 57 provided on the oscillating member 50.

[0079] Furthermore, a plurality of oscillating members 50 are supported in the circumferential direction by the base member 40, and the biasing member 60 has a plurality of engagement portions 63 that respectively engage with the oscillating members 50. As a result, the biasing members 60 bias the second power transmission member 20 in the circumferential direction relative to the first power transmission member 10 in a well-balanced manner, thereby effectively suppressing gear rattle noise.

[0080] The present invention is not limited to the exemplified embodiments, and various improvements and design modifications are possible within the scope of the gist of the present invention. [Industrial Applicability]

[0081] As described above, according to the present invention, it is possible to suppress rattle noise at the spline-fitted portions of the first and second power transmission members with good assembly ease, 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-fitting. [Explanation of symbols]

[0082] 6 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 40 Base member 50 Swinging member 51 Shaft 52 engaged portion 53 Connecting part 54 Engagement recess 55 First engagement recess 56 Second engagement recess 57 Mass Section 60 biasing member 62 Spring part 63 Engagement part 63a Engagement protrusion 64 Spline portion of biasing member 70 Locking mechanism

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 base member attached to the first power transmission member; a swinging member swingably supported by the base member; a biasing member having a spring portion compressible in a rotational direction, an engaging portion provided on one end of the spring portion and engaging with the swinging member, and a spline portion provided on the other end of the spring portion, wherein when the spring portion is in a compressed state, the engaging portion engages with the swinging member and the spline portion is fitted into a spline portion of the second power transmission member, thereby biasing the second power transmission member spline-fitted to the first power transmission member in a rotational direction; a locking mechanism that locks the biasing member at a biasing position where the spring portion is compressed and the engaging portion engages with the swinging member to bias the second power transmission member in a rotational direction relative to the first power transmission member, The locking mechanism is configured to lock the biasing member from a temporary locking position where the engaging portion engages with the swinging member when the spring portion is in a non-compressed state to the biasing position by the swinging member being swung by centrifugal force. Power transmission device.

2. the swinging member has a shaft portion swingably supported by the base member, an engaged portion engaged with the engaging portion, and a connecting portion connecting the shaft portion and the engaged portion, The locking mechanism is composed of the engaging portion and the engaged portion. The power transmission device according to claim 1 .

3. the engaging portion includes one of an engaging protrusion that protrudes in a rotational direction and an engaging recess that is recessed in the rotational direction so as to be able to engage with the engaging protrusion, the engaged portion includes the other of the engaging protrusion and the engaging recess. The power transmission device according to claim 2 .

4. The engaging portion includes an engaging protrusion that protrudes in the rotation direction, the engaged portion includes an engaging recess recessed in a rotational direction so as to be engageable with the engaging protrusion, The engagement recess includes a first engagement recess and a second engagement recess disposed radially inward from the first engagement recess, The engaging protrusion engages with the first engaging recess at the temporary fastening position and engages with the second engaging recess at the biased position. The power transmission device according to claim 2 .

5. The engaged portion is provided with a mass portion that increases centrifugal force. The power transmission device according to claim 2 .

6. The swinging members are supported in a circumferential direction by the base member, The biasing member has a plurality of engaging portions that respectively engage with the swinging member. The power transmission device according to claim 1 .

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