JP2017166626A - Shaft supporting structure of driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress torsion of a rotating shaft at a circumference of a part spline-fitted to the rotating shaft, and to improve silence and durability of a device with a simple constitution.SOLUTION: A shaft supporting structure of a driving device has a motor 20 having a rotor 21 rotating on a rotating shaft 61, and a planetary gear mechanism 30 having a sun gear 31 which is fitted to the rotating shaft 61 in a state of not relatively rotatable, the rotor 21 is provided with a rotor body 21a and a first spline-fitting portion 21b, the sun gear 31 is provided with a sun gear body 31a and a second spline-fitting portion 31b, the first spline-fitting portion 21b is spline-fitted to an outer diameter of the rotating shaft 61, and the first spline-fitting portion 21b is adjacent to one 21. 31 of the rotor body 21a and the sun gear body 31a in an axial direction, and axially extended to a position to be assembled to adjacent members 31, 41, 61B disposed in a state of not relatively rotatable to the rotating shaft 61, in a radial direction of the rotating shaft 61.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a shaft support structure of a drive device having a structure in which a rotor of an electric motor is disposed with respect to a rotation shaft and a gear is disposed in the vicinity of the rotor in the drive device.

  2. Description of the Related Art Conventionally, there is a drive device in which a drive shaft (input shaft) is rotationally driven by a drive source such as an electric motor in which a sun gear of a planetary gear mechanism is spline-fitted to the input shaft (see, for example, Patent Document 1). In this case, as shown in Patent Document 1, normally, the sun gear spline fitting portion is directly spline fitted to the input shaft spline fitting portion so that the sun gear cannot rotate relative to the input shaft. It is configured. The axial length of the spline fitting portion of the sun gear is substantially equal to the axial length of the sun gear main body.

  In such a configuration, when a driving force is transmitted from the driving source to the input shaft, the input shaft is twisted. Then, rattling noise is generated by the collision between the spline fitting portion of the sun gear and the spline fitting portion of the input shaft. This rattling noise makes it difficult to ensure the quietness of the drive device.

  On the other hand, if another member is provided only to prevent twisting around the input shaft in order to prevent twisting of the input shaft, it becomes difficult to save space and weight of the entire apparatus.

JP 2013-181634 A

  The present invention has been made in view of the above points, and its object is to suppress twisting of the rotating shaft around the portion where the spline is fitted to the rotating shaft, and to improve the quietness and durability of the apparatus with a simple configuration. There is to make it.

  In order to solve the above-described problems, the shaft support structure of the drive device (1, 2) according to the present invention includes an electric motor (20) having a rotor (21) that rotates about a rotating shaft (61), and a rotating shaft (61 ), A planetary gear mechanism (30) having a sun gear (31), a pinion gear (32) and a ring gear (33) that are relatively non-rotatably fitted, and the rotor (21) has a rotating shaft (61). The first spline fitting formed so that the rotor main body (21a) and the rotor (21) disposed in a direction intersecting with the axial direction of the shaft cannot be rotated relative to the rotating shaft (61). Part (21b) is formed, and the sun gear body (31a) and the sun gear (31), which are disposed in a direction intersecting the axial direction, are rotated relative to the rotating shaft (61). Second spline fitting formed to be impossible (31b) is formed, and at least one of the first spline fitting portion (21b) or the second spline fitting portion (31b) (21b, 31b) is spline-fitted with respect to the outer diameter of the rotating shaft (61). The first spline fitting portion (21b) or the second spline fitting portion (31b) (21b, 31b) is one of the rotor body (21a) and the sun gear body (31a) in the axial direction (21 , 31) and a position to be assembled in the radial direction of the rotating shaft (61) with respect to adjacent members (21, 31, 43, 61B) disposed so as not to rotate relative to the rotating shaft (61). It is characterized by extending in the axial direction.

  In this way, at least one of the first spline fitting portion or the second spline fitting portion that is spline fitted to the outer diameter of the rotating shaft is in a position where it is assembled to the adjacent member in the radial direction of the rotating shaft. If it is configured to extend in the axial direction, the length in the axial direction in which the extended first spline fitting portion or the second spline fitting portion and the rotating shaft are spline fitted becomes long. Then, since the spline fitting part of the extended part suppresses the twist of a rotating shaft, compared with the structure of the conventional spline fitting part which is not extended, the spline fitting part produced by the twist of a rotating shaft The rattling noise is reduced. For this reason, the silence of an apparatus increases. Moreover, the surface pressure in a spline fitting part becomes small by extending a spline fitting part. As a result, the impact at the spline fitting portion is alleviated and wear is reduced, so that durability is improved. And the quietness and durability of these apparatuses are achieved by a simple configuration of extending the spline fitting portion without adding a new member for suppressing torsion. Therefore, it is possible to suppress twisting of the rotary shaft around the portion where the spline is fitted to the rotary shaft, and to improve the quietness and durability of the apparatus with a simple configuration.

  Further, in the shaft support structure of the drive device (1, 2) described above, when the adjacent member is the rotor (21) or the sun gear (31), the first spline fitting portion (21b) or the second spline. One (21b, 31b) of the fitting part (31b) is spline-fitted to the outer diameter of the rotating shaft (61), and the first spline fitting part (21b) or the second spline fitting part (31b). The other (31b, 21b) of the first spline fitting part (21b) or the second spline fitting part (31b) may be spline fitted to the outer diameter of one (21b, 31b). Good.

  Further, in the shaft support structure of the drive device (1, 2) described above, when the adjacent member is a positioning member (41) for positioning the rotor (21) in the axial direction, the first spline fitting portion A positioning groove (21c) is formed on the inner peripheral side of (21b), and the positioning member (41) may be fitted into the positioning groove (21c).

  Further, in the shaft support structure of the drive device (1, 2) described above, the adjacent member is a fixing member (43) that prevents the rotor (21) or the sun gear (31) from coming off from the rotation shaft (61). In some cases, a fixing hole (H) is formed in the rotating shaft (61), and the fixing member (43) is fitted into the fixing hole (H).

  Further, in the shaft support structure of the drive device (1, 2) described above, when the adjacent member is the bearing member (61B), the bearing member (61B) is the first spline fitting portion (21b) or the second spline fitting portion. The spline fitting portion (31b) may be fixed to the one outer diameter by press-fitting or fixing by an annular fixing member (46).

As described above, by processing a part of the extended spline fitting portion and assembling the adjacent members effectively, the quietness and durability of the device can be achieved without increasing the size of the device. be able to.
In addition, the code | symbol in said parenthesis has shown the code | symbol of the corresponding component of embodiment mentioned later as an example of this invention.

  According to the shaft support structure of the drive device according to the present invention, it is possible to suppress twisting of the rotating shaft around the portion that is spline-fitted to the rotating shaft, and to improve the quietness and durability of the device with a simple configuration. .

It is a skeleton figure of the transmission which has a drive device. It is sectional drawing of the periphery of the rotating shaft of the drive device of 1st Embodiment. It is an expanded sectional view of the circumference of the rotor and sun gear of a 1st embodiment. It is an expanded sectional view showing the modification of the circumference of the rotor and sun gear of a 1st embodiment. It is an expanded sectional view showing the modification of the circumference of the rotor and sun gear of a 1st embodiment. It is an expanded sectional view of the circumference of the rotor and sun gear of a 2nd embodiment. It is an expanded sectional view showing the modification of the circumference of the rotor and sun gear of a 2nd embodiment.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a skeleton diagram of a transmission 50 having a driving device 1. The transmission 50 shown in FIG. 1 is a parallel shaft transmission of 7 forward speeds and 1 reverse speed, and is a dry dual clutch transmission (DCT). In order to understand the detailed configuration of the drive device 1, first, the transmission 50 having the drive device 1 will be schematically described, and then description related to the drive device 1 will be given.

  The transmission 50 includes a first input shaft 61 (rotary shaft) coupled to an internal combustion engine (not shown) via a first clutch C1 for odd-numbered stages and a second clutch C2 for even-numbered stages. The second input shaft 62 coupled to the internal combustion engine via the first input shaft 61 and the second input shaft 62 is connected to the internal combustion engine so as to be connectable / disconnectable, and corresponds to the selected gear stage. An output shaft 63 called a counter shaft that generates a rotational output, and a planetary gear mechanism 30 provided on one end side of the first input shaft 61. The first input shaft 61 is rotatably supported by the bearing member 61B. Similarly, the second input shaft 62 is rotatably supported by the bearing member 62B, and the output shaft 63 is rotatably supported by the bearing member 63B.

  The electric motor 20 is disposed at one end of the first input shaft 61. A rotor 21 (rotor) of the electric motor 20 is fixed so as to rotate integrally with a stator 22 (stator) of the electric motor 20, and the transmission 50 of the hybrid vehicle uses the internal combustion engine and the electric motor 20 as drive sources. Function. The output shaft 63 is coupled to a differential mechanism (not shown) and drives the driving wheel of the vehicle.

  A planetary gear mechanism 30 is disposed at one end of the first input shaft 61 near the electric motor 20. The planetary gear mechanism 30 includes a sun gear 31, a pinion gear 32, and a ring gear 33. The sun gear 31 is spline-fitted to the first input shaft 61 and rotates integrally with the first input shaft 61 and the electric motor 20. The ring gear 33 is fixed to the case of the transmission 50 and is configured to generate a shift output from the carrier 34 of the pinion gear 32.

  An outer main shaft OMS is connected to the output side of the second clutch C <b> 2, and the outer main shaft OMS is arranged concentrically so as to form an outer cylinder of the first input shaft 61. The outer main shaft OMS is always engaged with the reverse shaft RVS and the second input shaft 62 via the idle shaft IDS, and the rotation output of the second clutch C2 is transmitted to the reverse shaft RVS and the second input shaft 62.

  On the 1st input shaft 61, the 3rd speed drive gear 73, the 7th speed drive gear 77, and the 5th speed drive gear 75 are each arrange | positioned concentrically so that relative rotation is possible. A 3-7 speed switching mechanism 81 is slidably provided in the axial direction between the 3rd speed driving gear 73 and the 7th speed driving gear 77, and a 5th speed switching mechanism 83 is provided as a shaft corresponding to the 5th speed driving gear 75. It is slidable in the direction. A first speed switching mechanism 80 is provided between the carrier 34 and the third speed drive gear 73 on the first input shaft 61. By switching the first speed switching mechanism 80, the rotational driving force of the pinion gear 32 is transmitted to the output shaft 63 via the carrier 34. These gears and the switching mechanism provided in association with the first input shaft 61 constitute a first transmission gear mechanism for realizing odd-numbered gear stages (1, 3, 5, 7th speed).

  On the second input shaft 62, a second speed drive gear 72, a sixth speed drive gear 76, and a fourth speed drive gear 74 are concentrically disposed so as to be relatively rotatable. A 2-6 speed switching mechanism 82 is slidably provided in the axial direction between the 2nd speed driving gear 72 and the 6th speed driving gear 76, and the 4th speed switching mechanism 84 is a shaft corresponding to the 4th speed driving gear 74. It is slidable in the direction. These gears and the switching mechanism provided in association with the second input shaft 62 constitute a second speed change gear mechanism for realizing even speed stages (2, 4, 6th speed).

  Each drive gear of the first transmission gear mechanism and the second transmission gear mechanism meshes with the corresponding gear of the third driven gear 93 on the first driven gear 91 and the second driven gear 92 provided on the output shaft 63. By engaging in this way, the output shaft 63 is rotationally driven.

  Next, the shaft support structure of the drive device 1 will be described in detail. The drive device 1 of the present embodiment refers to a drive portion in which the electric motor 20 and the planetary gear mechanism 30 are connected by the first input shaft 61. FIG. 2 is a cross-sectional view around the first input shaft 61 (rotating shaft) of the drive device 1 according to the first embodiment. FIG. 2 is an enlarged view of part A of FIG.

  As shown in FIG. 2, the drive device 1 includes an electric motor 20 having a rotor 21 that rotates about a first input shaft 61, and a planetary gear mechanism 30 having a sun gear 31, a pinion gear 32, and a ring gear 33. The rotor 21 of the electric motor 20 and the sun gear 31 of the planetary gear mechanism 30 are configured so as not to rotate relative to the first input shaft 61. That is, the rotor 21 and the sun gear 31 rotate as the first input shaft 61 rotates.

  The rotor 21 is formed with a rotor main body 21a (rotor main body) and a spline fitting portion 21b (first spline fitting portion) that are erected in a direction crossing the axial direction of the first input shaft 61. The In addition, the sun gear 31 is formed with a sun gear main body 31a and a spline fitting portion 31b (second spline fitting portion) that are erected in a direction intersecting the axial direction.

  Various adjacent members are disposed in the vicinity of the rotor 21 and the sun gear 31. Here, the adjacent member includes not only a member that is directly adjacent to the rotor 21 or the sun gear 31, but also a member that is disposed in the vicinity of the rotor 21 or the sun gear 31 and that is disposed adjacent to the adjacent member. . In the present embodiment, a circlip 41 and a bearing member 61B disposed on the left side in the drawing are disposed as adjacent members. The circlip 41 is a C-shaped annular member having elasticity. The bearing member 61B is fixed on the right side in the figure by a circlip 61S fixed to the first input shaft 61.

  The assembly structure around the rotor 21 and the sun gear 31 of this embodiment will be described in detail. FIG. 3 is an enlarged cross-sectional view of the periphery of the rotor 21 and the sun gear 31 of the first embodiment. FIG. 3 is an enlarged view of portion B in FIG. In addition, the part engaged with spline is described typically.

  In this embodiment, the spline fitting part 21b of the rotor 21 is fitted to the outer diameter of the first input shaft 61, and the spline fitting part 31b of the sun gear 31 is fitted to the outer diameter of the spline fitting part 21b. Are mated.

  Moreover, the circlip 41 and the bearing member 61B are arrange | positioned as an adjacent member. Specifically, in the axial direction of the first input shaft 61, a circlip 41 (positioning member) that positions by restricting movement of the rotor 21 in the axial direction at a position adjacent to the rotor body 21 a is provided on the rotor 21. The inner circumferential groove 21c (positioning groove) and the outer circumferential groove V (positioning groove) formed in the first input shaft 61 are mounted. Further, the bearing member 61B is press-fitted into the outer diameter of the spline fitting portion 21b of the rotor 21 at a position adjacent to the opposite side of the rotor body 21a in the axial direction of the sun gear 31.

  The spline fitting portion 21b of the rotor 21 is extended so as to be longer in the axial direction than the axial length of the rotor body 21a, and the adjacent member is assembled in the radial direction of the spline fitting portion 21b. It has become. In the present embodiment, the circlip 41 is assembled to the inner diameter side of the spline fitting portion 21b, and the sun gear 31 and the bearing member 61B are assembled to the outer diameter side.

  Thus, in this embodiment, the spline fitting part 21b is extended in the axial direction to the position where it is assembled to the adjacent member in the radial direction of the spline fitting part 21b of the rotor 21. As described above, by increasing the axial length of the spline fitting portion 21b, the first input shaft 61 can be assembled longer in the axial direction. Thereby, the twist of the 1st input shaft 61 in the periphery of the spline fitting part 21b is suppressed. Since this can be achieved by appropriately extending the spline fitting portion 21b, various configuration changes are possible. Next, various modifications are shown.

  4 and 5 are enlarged cross-sectional views showing modifications of the periphery of the rotor 21 and the sun gear 31 of the first embodiment. FIG. 4A shows an example in which the spline fitting portion 21 b of the rotor 21 is extended in the axial direction to a position where the spline fitting portion 21 b is assembled to the circlip 41 and the sun gear 31. In this case, the circlip 41 is assembled to the inner diameter side of the spline fitting portion 21b, and the sun gear 31 is assembled to the outer diameter side. In this case, the bearing member 61 </ b> B is press-fitted and fixed to the first input shaft 61.

  In the example of FIG. 4B, the spline fitting portion 21 b of the rotor 21 extends in the axial direction to a position where it is assembled to the circlip 41. And the circlip 41 is assembled on the inner diameter side of the spline fitting portion 21b. Further, the spline fitting portion 31 b of the sun gear 31 is assembled by spline fitting with the first input shaft 61. The bearing member 61B is assembled to the first input shaft 61.

  Further, the circlip 41 is not an essential configuration. In the example of FIG. 4C, the cotter 42 that is a columnar member is fitted into the fixing hole H formed in the first input shaft 61. In the present modification, the cotter 42 is fixed to the first input shaft 61 and abuts against the rotor body 21a, thereby restricting the movement of the rotor body 21a in the axial direction. Also in this case, the spline fitting portion 31b of the sun gear 31 is assembled to the outer diameter side of the spline fitting portion 21b. The cotter 42 is fixed by a holding member 42a such as a retainer and an annular support member 42b.

  Further, as the adjacent member, a fixing member 43 such as a key for preventing rotation of the rotor 21 with respect to the first input shaft 61 may be used. In the example of FIGS. 5A to 5C, the fixing member 43 is fitted into the fixing hole H formed in the first input shaft 61. In this modification, the fixing member 43 is fixed by passing through the through hole 21d of the spline fitting portion 21b of the rotor 21 while being fixed to the first input shaft 61. The outer periphery of the fixing member 43 is held by an annular holding member 43 a such as a collar, and the fixing member 43 and the annular holding member 43 a are held by the circlip 41.

  And in the example of Fig.5 (a), the spline fitting part 21b of the rotor 21 is extended in the axial direction so that it may assemble | attach with respect to the circlip 41, the sun gear 31, and the bearing member 61B. In the example of FIG. 5A, the bearing member 61B is configured to be press-fitted into the rotor body 21a. However, the configuration is not limited thereto, and the bearing member 61B may be fixed by an annular fixing member such as a circlip. Good. In the example of FIG. 5B, the spline fitting portion 21 b of the rotor 21 extends in the axial direction so as to be assembled to the circlip 41 and the sun gear 31. In the example of FIG. 5C, the spline fitting portion 21 b of the rotor 21 extends in the axial direction so as to be assembled to the circlip 41.

  With the configuration described above, according to the shaft support structure of the drive device 1 of the present embodiment, the spline fitting portion 21b that is spline fitted to the outer diameter of the first input shaft 61 is the first input to the adjacent member. It is set as the structure extended in an axial direction to the position assembled | attached in the radial direction of the axis | shaft 61. FIG. As a result, the axial length in which the extended spline fitting portion 21b and the first input shaft 61 are spline fitted becomes longer. Then, since the spline fitting part 21b of the extended part suppresses the twist of the 1st input shaft 61, compared with the structure of the conventional spline fitting part which is not extended, the 1st input shaft 61 of FIG. The rattling noise of the spline fitting portion 21b caused by twisting is reduced. For this reason, the quietness of the drive device 1 is enhanced.

  Moreover, the surface pressure in the spline fitting part 21b becomes small by extending the spline fitting part 21b. Thereby, since the impact in the spline fitting part 21b is relieved and wear is reduced, durability is improved. And the quietness and durability of these drive devices 1 are achieved by a simple configuration of extending the spline fitting portion 21b without adding a new member for suppressing torsion. Therefore, the twist of the 1st input shaft 61 of the periphery of the part which carries out spline fitting to the 1st input shaft 61 can be suppressed, and the silence and durability of the drive device 1 can be improved with a simple structure.

  When the adjacent member adjacent to the rotor 21 having the spline fitting portion 21b is the sun gear 31, the spline fitting portion 21b is spline fitted to the outer diameter of the first input shaft 61, The spline fitting portion 31b is spline fitted to the outer diameter of the spline fitting portion 21b.

  Further, when the adjacent member adjacent to the rotor 21 having the spline fitting portion 21b is a positioning member that determines the position in the axial direction like the circlip 41, the inner member is located on the inner peripheral side of the spline fitting portion 21b. A circumferential groove 21c is formed, and the circlip 41 is fitted into the inner circumferential groove 21c.

  When the adjacent member adjacent to the rotor 21 having the spline fitting portion 21b is a fixing member 43 such as a key or a cotter that stops the rotation of the rotor 21 with respect to the first input shaft 61, the first input A fixing hole H is formed in the shaft 61, and the fixing member 43 is fitted into the fixing hole H.

  Further, when the adjacent member adjacent to the rotor 21 having the spline fitting portion 21b is the bearing member 61B, the bearing member 61B is press-fitted and fixed to the outer diameter of the spline fitting portion 21b. Good. The bearing member 61B may be fixed by a circlip 46 as an annular fixing member.

  In this way, by processing a part or the periphery of the extended spline fitting portion 21b and making the adjacent member effectively assembled to the existing rotor 21 or the first input shaft 61, the drive device 1 The quietness and durability of the drive device 1 can be achieved without increasing the size.

[Second Embodiment]
Next, the driving device 2 according to the second embodiment of the present invention will be described. In the description of the second embodiment and the corresponding drawings, the same or corresponding components as those of the driving device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted below. In addition, matters other than those described below are the same as those in the first embodiment.

  The assembly structure around the rotor 21 and the sun gear 31 of this embodiment will be described in detail. FIG. 6 is an enlarged cross-sectional view of the periphery of the rotor 21 and the sun gear 31 of the second embodiment. In the present embodiment, the spline fitting portion 31b of the sun gear 31 is fitted to the outer diameter of the first input shaft 61, and the spline fitting portion 21b of the rotor 21 is fitted to the outer diameter of the spline fitting portion 31b. Are mated.

  Further, as the adjacent members of the present embodiment, a cotter 42 and a bearing member 61B are disposed. Specifically, a cotter 42 that is a restricting member that restricts the movement of the rotor 21 in the axial direction at a position adjacent to the rotor body 21 a is fitted into the fixing hole H formed in the first input shaft 61. The cotter 42 is fixed by a holding member 42a such as a retainer and an annular support member 42b. A bearing member 61B is fixed to the sun gear body 31a of the sun gear 31 by a circlip 46 at a position adjacent to the rotor 21 in the axial direction of the sun gear 31. Note that the bearing member 61B is not necessarily fixed to the sun gear main body by the circlip 46, and may be fixed by press-fitting the sun gear main body 31a.

  The spline fitting portion 31b of the sun gear 31 extends so as to be longer in the axial direction than the axial length of the sun gear main body 31a, and the adjacent member is assembled in the radial direction of the spline fitting portion 31b. It has become. In the present embodiment, the rotor 21 and the bearing member 61B are assembled on the outer diameter side of the spline fitting portion 31b so that the cotter 42 penetrates in the radial direction orthogonal to the axial direction of the spline fitting portion 31b. Configured to stick.

  Thus, in this embodiment, the spline fitting part 31b is extended in the axial direction to a position where it is assembled to the adjacent member in the radial direction of the spline fitting part 31b of the sun gear 31. In this way, by increasing the axial length of the spline fitting portion 31b, the first input shaft 61 can be assembled longer in the axial direction. Thereby, the twist of the 1st input shaft 61 in the periphery of the spline fitting part 31b is suppressed. Since this can be achieved by appropriately extending the spline fitting portion 31b, various configuration changes are possible. Next, various modifications are shown.

  FIG. 7 is an enlarged cross-sectional view showing a modification of the periphery of the rotor 21 and the sun gear 31 of the second embodiment. In the example of FIG. 7A, the outer diameter side of the spline fitting portion 31 b of the sun gear 31 extends in the axial direction to a position where it is assembled to the rotor 21. Specifically, the spline fitting portion 31b of the sun gear 31 is placed at the position of the circlip 47, which is an annular fixing member having a function of preventing the rotor body 21a from being detached, and the circlip 48, which is a retaining member of the sun gear body 31a of the sun gear 31. An example extending in the axial direction is shown. That is, the circlip 47 is assembled to the outer diameter side and the circlip 48 is assembled to the inner diameter side of the left side of the spline fitting portion 31b of the sun gear 31 in the drawing. The bearing member 61B is press-fitted and fixed to the first input shaft 61.

  Also in the example of FIG. 7B, the spline fitting portion 31 b of the sun gear 31 extends in the axial direction to a position where it is assembled to the rotor 21. And the spline fitting part 21b of the rotor 21 is assembled | attached by carrying out the spline fitting of the outer peripheral side of the spline fitting part 31b. The rotor body 21a is fixed by a fixing member 49 such as a key. The fixing member 49 is fixed by a holding member 49a such as a retainer and an annular support member 49b. The bearing member 61B is press-fitted and fixed to the first input shaft 61.

  With the above configuration, according to the shaft support structure of the drive device 2 of the present embodiment, the spline fitting portion 31b that is spline fitted to the outer diameter of the first input shaft 61 is the first input to the adjacent member. It is set as the structure extended in an axial direction to the position assembled | attached in the radial direction of the axis | shaft 61. FIG. As a result, the axial length in which the extended spline fitting portion 31b and the first input shaft 61 are spline fitted becomes longer. Then, since the spline fitting part 31b of the extended part suppresses the twist of the 1st input shaft 61, compared with the structure of the conventional spline fitting part which is not extended, the 1st input shaft 61 of FIG. The rattling noise of the spline fitting portion 31b caused by twisting is reduced. For this reason, the quietness of the drive device 2 is enhanced.

  Moreover, the surface pressure in the spline fitting part 31b becomes small by extending the spline fitting part 31b. Thereby, since the impact in the spline fitting part 31b is relieved and wear is reduced, durability is improved. And the quietness and durability of these drive devices 2 are achieved by a simple configuration of extending the spline fitting portion 31b without adding a new member for suppressing torsion. Therefore, the twist of the 1st input shaft 61 of the periphery of the part which carries out spline fitting to the 1st input shaft 61 can be suppressed, and the silence and durability of the drive device 2 can be improved with a simple configuration.

  When the adjacent member adjacent to the sun gear 31 having the spline fitting portion 31b is the rotor 21, the spline fitting portion 31b is spline fitted to the outer diameter of the first input shaft 61, The spline fitting part 21b is spline fitted to the outer diameter of the spline fitting part 31b.

  Further, when the adjacent member adjacent to the rotor 21 having the spline fitting portion 21 b is the cotter 42 that stops the rotation of the rotor 21 with respect to the first input shaft 61, the fixing hole H is formed in the first input shaft 61. Is formed, and the cotter 42 is fitted into the fixing hole H.

  Further, when the adjacent member adjacent to the rotor 21 having the spline fitting portion 21b is the bearing member 61B, the bearing member 61B is press-fitted and fixed to the outer diameter of the spline fitting portion 21b. Good. The bearing member 61B may be fixed by the circlip 46, not limited to press-fitting.

  In this way, by processing a part or the periphery of the extended spline fitting part 31b and making the adjacent member effectively assembled to the existing sun gear 31 or the first input shaft 61, the drive device 2 The quietness and durability of the drive device 2 can be achieved without increasing the size.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Deformation is possible.

DESCRIPTION OF SYMBOLS 1, 2 ... Drive device 20 ... Electric motor 21 ... Rotor 21a ... Rotor main body 21b ... Spline fitting part 21c ... Inner peripheral groove 21d ... Through hole 22 ... Stator 30 ... Planetary gear mechanism 31 ... Sun gear 31a ... Sun gear main body 31b ... Spline fitting Portion 32 ... Pinion gear 33 ... Ring gear 34 ... Carrier 41 ... Circlip 42 ... Cotter 43 ... Fixing member 45 ... Bearing member 46 ... Circlip 47 ... Circlip 48 ... Circlip 49 ... Fixing member 50 ... Transmission 61 ... First input Shaft 61B ... Bearing member H ... Fixed hole V ... Outer peripheral groove

Claims (5)

An electric motor having a rotor that rotates about a rotation axis;
A planetary gear mechanism having a sun gear, a pinion gear and a ring gear which are fitted in the rotation shaft so as not to rotate relative to each other.
The rotor includes a rotor body disposed in a direction intersecting the axial direction of the rotating shaft and a first spline formed so that the rotor cannot rotate relative to the rotating shaft. A fitting part is formed,
The sun gear is formed with a sun gear main body disposed in a direction intersecting the axial direction and a second spline fitting portion formed so that the sun gear cannot be rotated relative to the rotating shaft. And
At least one of the first spline fitting portion or the second spline fitting portion is spline fitted to the outer diameter of the rotating shaft,
The one of the first spline fitting portion or the second spline fitting portion is arranged adjacent to the one of the rotor main body or the sun gear main body in the axial direction and not rotatable relative to the rotation shaft. A shaft support structure for a drive device, wherein the shaft support structure extends in the axial direction to a position where the adjacent member is assembled in a radial direction of the rotary shaft. When the adjacent member is the rotor or the sun gear,
The one of the first spline fitting portion or the second spline fitting portion is spline fitted to the outer diameter of the rotating shaft,
The other of the first spline fitting portion or the second spline fitting portion is spline fitted to the one outer diameter of the first spline fitting portion or the second spline fitting portion. The shaft support structure of the drive device according to claim 1. When the adjacent member is a positioning member that positions the rotor in the axial direction,
A positioning groove is formed on the inner peripheral side of the first spline fitting portion,
The shaft support structure for a driving apparatus according to claim 1, wherein the positioning member is fitted into the positioning groove. When the adjacent member is a fixing member that prevents the rotor or the sun gear from coming off from the rotating shaft,
A fixing hole is formed in the rotating shaft,
The shaft support structure for a driving apparatus according to any one of claims 1 to 3, wherein the fixing member is fitted into the fixing hole. When the adjacent member is a bearing member,
5. The bearing according to claim 1, wherein the bearing member is press-fitted and fixed to the outer diameter of the first spline fitting portion or the second spline fitting portion by an annular fixing member. The shaft support structure of the drive device of any one of Claims 1.

Images