Spline engagement structure

Abstract

To provide a spline engagement structure which can suppress the backlash of an engaged portion of a spline in a rotation direction.SOLUTION: A spline engagement structure comprises an engagement member 50, a pin member 55, a spring member 56 and a first electric motor (MG1) 20. The engagement member 50 has a spline 511 which is formed along an axial direction at an external peripheral part 51, and a communication hole 53 which is formed so as to make the external peripheral part 51 and an internal peripheral part 52 communicate with each other. The spring member 56 is attached along the pin member 55 which is inserted into the communication hole 53 of the engagement member 50, and a peripheral direction of the engagement member 50 at the internal peripheral part 52. A spline 22a of an MG1 shaft 22 of the first electric motor (MG1) 20 is engaged with the spline 511 of the engagement member 50. The pin member 55 is energized toward the MG1 shaft 22 of the first electric motor (MG1) 20 by the spring member 56.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a spline engagement structure. [Background technology]

[0002] Conventionally, a spline engagement structure has been proposed (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a clutch arrangement structure (spline engagement structure) that includes an engine, a motor capable of starting the engine, and a coupling member that connects the engine shaft and the motor shaft. The above-mentioned Patent Document 1 describes that a spline is formed on the outer periphery of the coupling member, and that the spline of the coupling member is engaged with the spline formed on the engine shaft and the motor shaft, thereby enabling the power of the motor to be transmitted to the engine. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 9,964,157 Summary of the Invention [Problem to be solved by the invention]

[0005] In the clutch arrangement structure described in Patent Document 1, backlash (looseness) is set in the spline engagement portions of each member, and this backlash absorbs positional deviations of each member.

[0006] However, if the backlash is set large, the gap between the splines becomes large, which causes tooth strike when the splines come into contact with each other in the rotational direction. On the other hand, if the backlash is set small, the gap between each component becomes small, making it difficult to assemble the components. For these reasons, while a certain amount of backlash is necessary at the spline engagement portion, there is a problem in that it is difficult to suppress rattling in the rotational direction at the spline engagement portion.

[0007] The present invention has been made to solve the above problems, and has an object to provide a spline engagement structure that is capable of suppressing rattling in the rotational direction at the engagement portion of the spline. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention is configured as follows.

[0009] (1) A spline engagement structure according to the present invention comprises an engaging member having splines formed along the axial direction on one of an outer periphery and an inner periphery, and a communicating hole provided to communicate the outer periphery and the inner periphery, a pin member inserted into the communicating hole of the engaging member, a spring member attached along the circumferential direction on the other of the outer periphery and the inner periphery of the engaging member, and an engaged member having an engaged spline formed thereon that engages with the spline of the engaging member, and the pin member is biased toward the engaged member by the spring member.

[0010] According to the above-mentioned configuration, the pin member is pushed toward the engaged member by the elastic force of the spring member, and the tip of the pin member is pressed against the engaged member, thereby suppressing return rotation of the spline caused by rotational fluctuations in the engaging member and the engaged member, thereby suppressing rattling in the rotational direction at the engagement portion of the spline between the engaging member and the engaged member.

[0011] (2) In the spline engagement structure according to the present invention, preferably, the spline is formed on the outer periphery of the engagement member, the spring member is attached to the inner periphery of the engagement member, and the pin member is biased from the inner periphery toward the outer periphery by the spring member. With this configuration, the pin member is pushed from the inner periphery toward the outer periphery toward the engaged member by the elastic force of the spring member, and the tip of the pin member is pressed against the engaged member, thereby suppressing return rotation of the spline due to rotational fluctuations in the engagement member and engaged member. Therefore, it is possible to suppress rattling in the rotational direction at the engagement portion of the spline between the outer periphery of the engagement member and the engaged member.

[0012] (3) In the configuration in which the spring member is attached to the inner peripheral portion of the engaging member, it is preferable that the engaging member further includes an axial member inserted into the inner peripheral portion of the engaging member, and the axial member, the spring member, and the pin member are arranged so as to overlap along the radial direction of the engaging member. With this configuration, the axial member inserted into the inner peripheral portion of the engaging member can prevent the pin member and the spring member from falling off toward the inner peripheral portion in the radial direction.

[0013] (4) In the configuration in which a shaft member is inserted into the inner peripheral portion of the engaging member, the shaft member is preferably an engine shaft to which engine power is transmitted, or a motor shaft to which motor power is transmitted. With this configuration, the engine shaft or motor shaft inserted into the inner peripheral portion of the engaging member can prevent the pin member and the spring member from falling off toward the inner peripheral portion in the radial direction. Therefore, the engine shaft or motor shaft can also serve as a member for preventing the pin member and the spring member from falling off.

[0014] (5) In the above-mentioned configuration in which the spring member is attached to the inner peripheral portion of the engaging member, it is preferable that the inner peripheral portion of the engaging member is provided with a groove portion in which the spring member is attached. With this configuration, the spring member can be easily fitted into the groove portion of the inner peripheral portion of the engaging member, so that the spring member can be prevented from moving along the axial direction of the engaging member. Therefore, the spring member can be stably arranged on the inner peripheral portion of the engaging member.

[0015] (6) In the spline engagement structure according to the present invention, the spring member preferably has a substantially C-shape, and both ends of the spring member are provided with protrusions that protrude toward the engagement member. With this configuration, when the spring member moves in the circumferential direction of the engagement member, the protrusions of the spring member catch on the pin member, thereby preventing the pin member from falling out of the gap between the ends of the spring member.

[0016] (7) In the spline engagement structure according to the present invention, the spring member is preferably a leaf spring member having a predetermined width. With this configuration, the leaf spring member can prevent the pin member from falling out of the communication hole and can stably press the pin member against the engaged member.

[0017] (8) In the spline engagement structure according to the present invention, the pin member preferably has a dish portion having a diameter larger than the diameter of the insertion hole of the engagement member. With this configuration, when the pin member is inserted into the communicating hole of the engagement member, the dish portion of the pin member abuts against the end of the communicating hole, so that the pin member can be positioned at a predetermined position in the communicating hole without jumping out of the communicating hole.

[0018] (9) In the spline engagement structure according to the present invention, preferably, a plurality of the pin members are provided along the circumferential direction of the engaging member. With this configuration, the plurality of pin members are pushed out against a plurality of locations of the engaged member by the elastic force of the spring member, so that the tips of the plurality of pin members are pressed against a plurality of locations of the engaged member. As a result, rattling in the rotational direction at the engagement portion of the spline between the engaging member and the engaged member can be effectively suppressed at a plurality of locations in the circumferential direction.

[0019] (10) In this case, the pin members are preferably arranged at equal angular intervals along the circumferential direction of the engaging member. With this configuration, the tips of the pin members are pressed against the engaged member uniformly along the circumferential direction of the engaging member. Therefore, rattling in the rotational direction at the engaging portion of the spline between the engaging member and the engaged member can be uniformly suppressed along the circumferential direction.

[0020] (11) In the spline engagement structure according to the present invention, preferably, the spline of the engaging member has a crest and a valley, and the communication hole of the engaging member is provided in the crest. With this configuration, the tip of the pin member is disposed on the crest of the spline of the engaging member, so that the pin member can be configured as a part of the crest of the spline. This makes it easier for the pin member to come into contact with the engaged spline of the engaged member, so that rattling in the rotational direction at the engagement portion of the spline between the engaging member and the engaged member can be effectively suppressed. Effect of the Invention

[0021] According to an aspect of the present invention, it is possible to provide a spline engagement structure that is capable of suppressing rattling in the rotational direction at the engagement portion of the spline. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic diagram showing a transaxle according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing a spline engagement structure according to the embodiment. [Diagram 3] FIG. 2 is a perspective view showing a main part of the spline engagement structure according to the embodiment. [Figure 4] FIG. 2 is an exploded perspective view showing a main part of the spline engagement structure according to the embodiment. [Diagram 5] 2 is a cross-sectional view showing a main part of the spline engagement structure according to the embodiment. FIG. [Figure 6] 2 is an enlarged view showing a main part of the spline engagement structure according to the embodiment. FIG. [Figure 7] FIG. 2 is a perspective view of a pin member according to the embodiment. [Figure 8] FIG. 11 is a perspective view showing a main part of a spline engagement structure according to a modified example of the embodiment. [Figure 9] FIG. 11 is a perspective view of a pin member according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] A spline engagement structure according to an embodiment of the present invention will now be described with reference to the accompanying drawings, which are schematic diagrams and are not necessarily drawn to scale, and in which like components are designated by like reference numerals.

[0024] (Transaxle) The overall configuration of a transaxle equipped with a spline engagement structure according to this embodiment will be described with reference to FIG.

[0025] 1, a transaxle 10 is provided in a vehicle 1. The vehicle 1 is provided with an engine 2 and a battery (not shown). The vehicle 1 is also provided with a PCU (power control unit) (not shown).

[0026] The vehicle 1 is capable of running by driving a first electric motor 20 using the engine 2 as a power source, which in turn drives a second electric motor 30 (described later). The vehicle 1 is also a so-called series hybrid vehicle, which is capable of running by stopping the engine 2 and driving the second electric motor 30 using a battery as a power source (EV running).

[0027] The transaxle 10 can be suitably used in hybrid vehicles equipped with an engine, such as series hybrid vehicles and parallel hybrid vehicles.

[0028] The transaxle 10 includes a first electric motor 20, a second electric motor 30, a differential mechanism 40, a casing (not shown), and an oil pump 70. The transaxle 10 also includes a counter shaft 44 and a counter gear 45.

[0029] The first electric motor 20 (MG1) is a motor generator. A generator controller incorporating an inverter and the like is connected to the first electric motor 20. AC power output from the first electric motor 20 is converted to DC power by the generator controller, and the DC power is supplied to a battery to charge the battery. The first electric motor 20 is driven by rotational power transmitted by the drive of the engine 2.

[0030] In this embodiment, in the transaxle 10, the first electric motor 20 is directly attached to the engine 2. More specifically, the first electric motor 20 is connected (engaged) by an engagement member 50 described later so that a rotating shaft (MG1 shaft 22) rotates integrally with a rotating shaft (engine shaft 3) of the engine 2. In other words, the first electric motor 20 is disposed so as to be coaxial with the engine 2.

[0031] The second motor 30 (MG2) is a motor generator. A motor controller incorporating an inverter and the like is connected to the second motor 30. A battery is connected to the motor controller. DC power output from the battery is supplied to the motor controller, the DC power is converted to AC power by the motor controller, and the AC power is supplied to the second motor 30, thereby driving the second motor 30.

[0032] A carrier shaft 34 is provided coaxially with the rotating shaft (MG2 shaft 32) of the second electric motor 30. The carrier shaft 34 is held so as to be rotatable relative to the rotating shaft (MG2 shaft 32) of the second electric motor 30. In addition, a carrier gear 35 is provided on the carrier shaft 34 so as to rotate integrally with the carrier shaft 34.

[0033] The differential mechanism 40 is configured to allow differential motion between a pair of left and right drive shafts (not shown) that drive left and right drive wheels, and to transmit rotational power to the pair of left and right drive shafts. The differential mechanism 40 is configured of multiple gears including a differential ring gear 42.

[0034] The counter shaft 44 is provided so as to extend parallel to the carrier shaft 34. The counter gear 45 is provided so as to rotate integrally with the counter shaft 44, and is meshed with the carrier gear 34. In addition, an output gear 46 is provided on the counter shaft 44 so as to rotate integrally with the counter shaft 44. The output gear 46 is meshed with the differential ring gear 42.

[0035] The power of the second electric motor 30 is transmitted to the carrier shaft 34. The power transmitted to the carrier shaft 34 is transmitted to the differential ring gear 42 of the differential mechanism 40 via the carrier gear 35, the counter gear 45 and the output gear 46, and is transmitted from the differential mechanism 40 to the drive wheels (not shown) via a drive shaft (not shown). This causes the drive wheels to rotate and the vehicle 1 to travel.

[0036] (Spline engagement structure) Next, the spline engagement structure according to this embodiment will be described with reference to FIGS.

[0037] 2, an engagement member 50 is disposed between the engine shaft 3 of the engine 2 and the MG1 shaft 22 of the first electric motor 20 (MG1). The engagement member 50 engages (fastens) with the engine 2 so as to transmit the power of the engine 2 to the first electric motor 20.

[0038] 2 to 6, engaging member 50 is formed in an annular shape having an outer circumferential portion 51 and an inner circumferential portion 52. In addition, engaging member 50 is provided with communication holes 53 along the radial direction so as to connect outer circumferential portion 51 and inner circumferential portion 52 to each other.

[0039] A spline 511 extending along the axial direction of the engaging member 50 is formed on the outer periphery 51 of the engaging member 50. As shown in FIG. 2, the spline 511 is configured to be spline-engaged with a spline 22a formed on the inner periphery of the MG1 shaft 22 of the first electric motor 20 (MG1). The first electric motor 20 (MG1) is an example of the "engaged member" of the present invention, the MG1 shaft 22 is an example of the "motor shaft" of the present invention, and the spline 22a is an example of the "engaged spline" of the present invention. As shown in FIGS. 3 to 6, the spline 511 has a peak portion 511a, a valley portion 511b, and an inclined portion 511c. A communication hole 53 is provided in the peak portion 511a.

[0040] As shown in Figs. 3 to 5, six bolt insertion holes 54a are formed in the side surface 54 of the engaging member 50 at equal angular intervals (at 60° intervals in this embodiment) along the circumferential direction. As shown in Fig. 2, six bolt fastening holes 3a are formed in the engine shaft 3 of the engine 2. The engaging member 50 and the engine shaft 3 are fastened and fixed by fastening bolts 80 to the bolt fastening holes 3a through the bolt insertion holes 54a. In addition, the engine shaft 3 of the engine 2 is formed with an extension portion 3b extending toward the inner peripheral portion 52 of the engaging member 50. The engine shaft 3 is an example of the "shaft member" in the present invention.

[0041] 3 to 6, a groove 52a is formed in the circumferential direction on the inner peripheral portion 52 of the engaging member 50. The groove 52a has a predetermined width along the axial direction of the engaging member 50. The groove 52a is provided with the above-mentioned communication hole 53. That is, the communication hole 53 communicates between the groove 52a of the inner peripheral portion 52 and the peak portion 511a of the spline 511 of the outer peripheral portion 51.

[0042] 4, 5, and 7, a plurality of pin members 55 (three in this embodiment) are inserted into communication holes 53 in inner peripheral portion 52 of engaging member 50 from inner peripheral portion 52 toward outer peripheral portion 51. These pin members 55 are disposed at equal angular intervals (120° intervals in this embodiment) along the circumferential direction of engaging member 50.

[0043] 6 and 7, the pin member 55 has a dish portion 551 arranged on the inner periphery 52 side and a shaft portion 552 arranged on the outer periphery 51 side when placed in the communication hole 53. The dish portion 551 has a diameter larger than the diameter of the shaft portion 552 and the diameter of the communication hole 53 of the engagement member 50. As a result, when the pin member 55 is inserted into the communication hole 53, the dish portion 551 abuts against the end (entrance) of the communication hole 53, so that the pin member 55 is prevented from jumping out toward the outer periphery 51 side. In addition, the tip portion of the shaft portion 552 is formed in a tapered shape (tapered shape).

[0044] 4 to 6, a spring member 56 is attached to the groove portion 52a of the inner peripheral portion 52 of the engaging member 50 along the circumferential direction of the engaging member 50. As a result, in this embodiment, the pin member 55 is urged (in the radial direction) from the inner peripheral portion 52 toward the outer peripheral portion 51 of the engaging member 50 by the spring member 56. As a result, the tip of the pin member 55 abuts against the spline 22a of the first electric motor (MG1) 20.

[0045] Moreover, the spring member 56 has a predetermined width along the axial direction of the engaging member 50. Moreover, the spring member 56 has a substantially C-shape. A protrusion 56a is provided on each of both ends in the circumferential direction of the spring member 56. Each protrusion 56a is formed so as to protrude toward the inner periphery 52 (outward) of the engaging member 50 when the spring member 56 is attached to the groove 52a of the engaging member 50.

[0046] 2, the extension portion 3b of the engine shaft 3 of the engine 2 is disposed radially inside the spring member 56. This extension portion 3b is inserted into the inner periphery 52 of the engagement member 50. As a result, the extension portion 3b (shaft member) of the engine shaft 3, the spring member 56, and the pin member 55 are disposed so as to overlap along the radial direction of the engagement member 50.

[0047] According to the embodiment described above, the following advantages (1) to (10) can be obtained.

[0048] (1) In the spline engagement structure according to this embodiment, the pin member 55 is biased from the inner peripheral portion 52 toward the outer peripheral portion 51 by the spring member 56. Therefore, the elastic force of the spring member 56 pushes the pin member 55 from the inner peripheral portion 52 toward the outer peripheral portion 51 toward the first electric motor (MG1) 20, and the tip of the pin member 55 is pressed against the spline 22a of the first electric motor (MG1) 20, thereby suppressing return rotation of the splines 511 and 22a due to rotation fluctuation. This makes it possible to suppress rattling in the rotational direction at the engagement portion between the spline 511 of the outer peripheral portion 51 of the engagement member 50 and the spline 22a of the first electric motor (MG1) 20.

[0049] (2) In the spline engagement structure according to this embodiment, the engine shaft 33, the spring member 56, and the pin member 55 are arranged to overlap along the radial direction of the engagement member 50. Therefore, the engine shaft 33 inserted into the inner periphery 52 of the engagement member 50 can prevent the pin member 55 and the spring member 56 from falling off toward the inner periphery in the radial direction.

[0050] (3) In the spline engagement structure according to this embodiment, the engine shaft 3, to which the power of the engine 2 is transmitted, is inserted into the inner periphery 52 of the engagement member 50. Therefore, the engine shaft 3 inserted into the inner periphery 52 of the engagement member 50 can prevent the pin member 55 and the spring member 56 from falling off toward the inner periphery in the radial direction. As a result, the engine shaft 3 can also serve as a member for preventing the pin member 55 and the spring member 56 from falling off.

[0051] (4) In the spline engagement structure according to this embodiment, groove portion 52a into which spring member 56 is attached is provided on inner periphery 52 of engagement member 50. As a result, spring member 56 easily fits into groove portion 52a of inner periphery 52 of engagement member 50, thereby preventing spring member 56 from moving in the axial direction of engagement member 50. Therefore, spring member 56 can be stably disposed on inner periphery 52 of engagement member 50.

[0052] (5) In the spline engagement structure according to the present embodiment, protrusions 56a protruding toward the engagement member 50 are provided at both ends of the spring member 56. As a result, when the spring member 56 moves in the circumferential direction of the engagement member 50, the protrusions 56a of the spring member 56 get caught on the pin member 55, thereby preventing the pin member 55 from falling out of the gap between the ends of the spring member 56.

[0053] (6) In the spline engagement structure according to the present embodiment, a leaf spring member having a predetermined width is used as the spring member 56. Therefore, the leaf spring member can prevent the pin member 55 from falling out of the communication hole 53, and can stably press the pin member 55 against the first electric motor (MG1) 20.

[0054] (7) The spline engagement structure according to this embodiment uses pin member 55 having dish portion 551 with a diameter larger than the diameter of communicating hole 53 of engaging member 50. As a result, when pin member 55 is inserted into communicating hole 53 of engaging member 50, dish portion 551 of pin member 55 abuts against the end of communicating hole 53, so that pin member 55 can be positioned at a predetermined position in communicating hole 53 without jumping out of communicating hole 53.

[0055] (8) In the spline engagement structure according to this embodiment, three pin members 55 are provided along the circumferential direction of the engagement member 50. As a result, the three pin members 55 are pushed out toward three locations on the motor shaft 22 of the first electric motor (MG1) 20 by the elastic force of the spring members 56, and the tips of the three pin members 55 are pressed against three locations on the motor shaft 22 of the first electric motor (MG1) 20. As a result, rattling in the rotational direction at the engagement portion of the splines between the engagement member 50 and the first electric motor (MG1) 20 can be effectively suppressed at three locations in the circumferential direction.

[0056] (9) In the spline engagement structure according to this embodiment, the three pin members 55 are disposed at equal angular intervals along the circumferential direction of the engagement member 50. This allows the tips of the three pin members 55 to be pressed uniformly against the motor shaft 22 of the first electric motor (MG1) 20 along the circumferential direction of the engagement member 50. This makes it possible to uniformly suppress rattling in the rotational direction at the engagement portion of the splines between the engagement member 50 and the first electric motor (MG1) 20 along the circumferential direction.

[0057] (10) In the spline engagement structure according to this embodiment, the communication hole 53 of the engagement member 50 is provided in the crest portion 511a of the spline 511. As a result, the tip of the pin member 55 is disposed on the crest portion 511a of the spline 511 of the engagement member 50, and the pin member 55 can be configured as a part of the crest portion 511a of the spline 511. As a result, the pin member 55 can easily come into contact with the spline 22a of the first electric motor (MG1) 20, and therefore rattle in the rotational direction at the engagement portion of the spline between the engagement member 50 and the first electric motor (MG1) 20 can be effectively suppressed.

[0058] (Modification) Next, a spline engagement structure according to a modification of this embodiment will be described with reference to FIGS.

[0059] In this modified example, unlike the case where the tip of the pin member described in the above embodiment has a tapered shape, the tip of the pin member has a shape corresponding to the ridges of the spline (tooth shape) will be described.

[0060] 8 and 9, the pin member 57 has a dish portion 571 arranged on the inner periphery 52 side and a shaft portion 572 arranged on the outer periphery 51 side when the pin member 57 is arranged in the communication hole 53. The dish portion 571 has a diameter larger than the diameter of the shaft portion 572 and the diameter of the communication hole 53 of the engagement member 50. As a result, when the pin member 57 is inserted into the communication hole 53, the dish portion 571 abuts against the end (entrance) of the communication hole 53, so that the pin member 57 is prevented from jumping out to the outer periphery 51 side. In addition, the tip portion of the shaft portion 572 has a shape (tooth shape) corresponding to the shape of the ridge portion 511a of the engagement member 50.

[0061] The tip of the shaft portion 572 of the pin member 57 has two flat portions 572a, two inclined portions 572b, and one apex 572c. Each flat portion 572a is formed along the radial direction of the shaft portion 572. One end of each inclined portion 572b is connected to each flat portion 572a and is formed in a tapered shape (tapering shape). The apex 572c is connected to the other end of each inclined portion 572b and is formed along the radial direction of the shaft portion 572.

[0062] 8, each flat portion 572a of the pin member 57 corresponds to a valley portion 511b of the spline 511 of the engagement member 50. Each inclined portion 572b of the pin member 57 corresponds to a slope portion 511c of the spline 511 of the engagement member 50. The peak portion 572c of the pin member 57 corresponds to a peak portion 511a of the spline 511 of the engagement member 50.

[0063] According to the above-described modified example, in addition to the above-described advantages (1) to (6), the following advantages (11) to (14) can be obtained.

[0064] (11) In the spline engagement structure according to the modified example of the present embodiment, a pin member 57 is used having a disk portion 571 with a diameter larger than the diameter of the communicating hole 53 of the engaging member 50. As a result, when the pin member 57 is inserted into the communicating hole 53 of the engaging member 50, the disk portion 571 of the pin member 57 abuts against the end of the communicating hole 53, so that the pin member 57 can be positioned at a predetermined position in the communicating hole 53 without jumping out of the communicating hole 53.

[0065] (12) In the spline engagement structure according to the modified example of the present embodiment, three pin members 57 are provided along the circumferential direction of the engagement member 50. As a result, the three pin members 57 are pushed out toward three locations on the motor shaft 22 of the first electric motor (MG1) 20 by the elastic force of the spring member 56, and the tips (flat portion 572a, inclined portion 572b, and apex portion 572c) of the three pin members 57 are pressed against three locations on the motor shaft 22 of the first electric motor (MG1) 20. As a result, rattling in the rotational direction at the engagement portion of the splines between the engagement member 50 and the first electric motor (MG1) 20 can be effectively suppressed at three locations in the circumferential direction. In addition, according to the modified example, the contact surface pressure between the tip of the pin member 57 and the splines 22a of the first electric motor (MG1) 20 is smaller than when the tip of the pin member 57 is spherical, and therefore the contact surface pressure at the engagement portion of the splines can be easily adjusted.

[0066] (13) In the spline engagement structure according to the modified example of the present embodiment, the three pin members 57 are disposed at intervals of 120° along the circumferential direction of the engagement member 50. This allows the tips (flat portions 572a, inclined portions 572b, and apexes 572c) of the three pin members 57 to be pressed against the motor shaft 22 of the first electric motor (MG1) 20 uniformly along the circumferential direction of the engagement member 50. This makes it possible to uniformly suppress rattling in the rotational direction at the engagement portion of the splines between the engagement member 50 and the first electric motor (MG1) 20 along the circumferential direction.

[0067] (14) In the spline engagement structure according to the modified example of the present embodiment, the communication hole 53 of the engagement member 50 is provided in the peak portion 511a of the spline 511. As a result, the tip (flat portion 572a, inclined portion 572b, apex portion 572c) of the pin member 57 is disposed on the peak portion 511a of the spline 511 of the engagement member 50, so that the tip of the pin member 57 can be configured as a part of the peak portion 511a of the spline 511. As a result, the pin member 57 can easily come into contact with the spline 22a of the first electric motor (MG1) 20, so that rattle in the rotational direction at the engagement portion of the spline between the engagement member 50 and the first electric motor (MG1) 20 can be effectively suppressed.

[0068] (Other variations) The above embodiment can be modified as follows.

[0069] In the above embodiment, an example is shown in which a spline is formed on the outer periphery of the engaging member and a spring member is attached to the inner periphery of the engaging member, but the present invention is not limited to this. In the present invention, it is also possible to configure the engaging member such that a spring member is attached to the outer periphery of the engaging member, a spline is formed on the inner periphery of the engaging member, and the pin member is biased from the outer periphery toward the inner periphery by the spring member.

[0070] In the above embodiment, the extension portion (shaft member) of the engine shaft, the spring member, and the pin member are arranged to overlap in the radial direction of the engagement member, but the present invention is not limited to this. In the present invention, it is also possible to use another member instead of the shaft member as long as it is possible to prevent the pin member from falling out of the communication hole.

[0071] In the above embodiment, an example in which an extension portion of an engine shaft is inserted is shown as an example of a shaft member to be inserted into the inner peripheral portion of the engagement member, but the present invention is not limited to this. In the present invention, a motor shaft to which the power of a motor is transmitted may be inserted as the shaft member to be inserted into the inner peripheral portion of the engagement member. In this case, it is preferable to configure the engagement member so that the engine shaft of the engine is disposed on the outer peripheral portion, and to configure the splines on the outer peripheral portion of the engagement member so as to engage with the splines formed on the engine shaft.

[0072] In the above embodiment, an example is shown in which a groove portion in which the spring member is attached is provided on the inner peripheral portion of the engagement member, but the present invention is not limited to this. In the present invention, it is also possible to provide a movement restriction portion other than the groove portion as long as it is possible to restrict the movement of the spring member along the axial direction of the engagement member.

[0073] In the above embodiment, the spring member is provided with protrusions protruding toward the engaging member at both ends thereof, but the present invention is not limited to this. In the present invention, the spring member may be provided with a protrusion only at one end thereof.

[0074] In the above embodiment, the spring member is a leaf spring member having a predetermined width, but the present invention is not limited to this. In the present invention, the width of the spring member may be set according to the axial thickness of the engagement member, and the spring member may be, for example, a linear spring member.

[0075] In the above embodiment, an example was shown in which three pin members were arranged along the circumferential direction of the engaging member, but the present invention is not limited to this. In the present invention, it is possible to arrange one or more pin members depending on the magnitude of the biasing force of the pin member against the engaged member.

[0076] In the above embodiment, the three pin members are arranged at equal angular intervals along the circumferential direction of the engagement member, but the present invention is not limited to this. In the present invention, the three pin members may be arranged at unequal angular intervals along the circumferential direction of the engagement member.

[0077] In the above embodiment, an example has been shown in which the communication holes are provided in the ridges of the splines of the engaging member, but the present invention is not limited to this. In the present invention, the communication holes may be provided in a portion of the engaging member other than the ridges of the splines.

[0078] The above-described embodiments are merely examples of the application of the present invention, and it goes without saying that any other embodiments within the scope of the claims are also included in the technical scope of the invention. [Explanation of symbols]

[0079] 3: Engine shaft (shaft material) 20: First electric motor (engaged member) 22: MG1 axis (motor axis) 22a: Spline (engaged spline) 51: Outer periphery 511: Spline 52: Inner circumference 52a:Groove 50: Engagement member 53:Communication hole 55: Pin member 551:Dish section 56: Spring parts 56a:Protrusion 57: Pin member 571:Dish section 511a: Yamabe 511b: Tanibe

Claims

1. an engaging member formed in an annular shape, the engaging member having a spline formed along an axial direction on one of an outer circumferential portion and an inner circumferential portion, and a communication hole provided to communicate the outer circumferential portion and the inner circumferential portion; a pin member inserted into the communication hole of the engagement member; a spring member attached along a circumferential direction to the other of the outer circumferential portion and the inner circumferential portion of the engagement member; an engaged member having engaged splines formed thereon to engage with the splines of the engaging member, A spline engagement structure characterized in that the pin member has a dish portion having a diameter larger than the diameter of the communicating hole of the engaging member, is biased toward the engaged member by the spring member, and the dish portion is positioned between the engaging member and the spring member when the pin member is inserted into the communicating hole.

2. The splines are formed on the outer periphery of the engagement member, the spring member is formed in an annular shape with a portion thereof cut out in a circumferential direction, and is attached to the inner circumferential portion of the engagement member, The spring member is provided at both ends in a circumferential direction with protrusions protruding toward the engaging member, 2. The spline engagement structure according to claim 1, wherein the pin member is biased from the inner peripheral portion toward the outer peripheral portion by the spring member.

3. a shaft member inserted into the inner periphery of the engagement member, 3. The spline engagement structure according to claim 2, wherein the shaft member, the spring member, and the pin member are arranged to overlap each other in a radial direction of the engagement member.

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