JP2006342941A - Mounting structure for driving force transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for a driving force transmission device having simple construction for suppressing the occurrence of vibration resulting from irregular rotation. <P>SOLUTION: The driving force transmission device 6 comprises an inner shaft 12 connected to a propeller shaft 5, an outer housing 13 connected to a pinion shaft 7, and a main clutch 14 arranged between the inner shaft 12 and the outer housing 13. The inner shaft 12 is pivoted to a differential carrier 10, and the outer housing 13 is connected to the pinion shaft 7 with spline fitting. The spline fitting is carried out by pressing the pinion shaft 7 into a spline fitting portion 13a of the outer housing 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mounting structure for a driving force transmission device housed in a differential carrier.

In general, the driving force transmission device as described above includes a first member coupled to the propeller shaft, a second member coupled to a pinion shaft provided in the differential carrier, and a drive disposed between the two members. A force transmission mechanism (friction clutch mechanism). Then, the first member is pivotally supported by the differential carrier, and the second member is connected to the pinion shaft by spline fitting, so that the inside of the cylindrical portion formed on either the first member or the second member. The other is arranged in the differential carrier and is accommodated in a differential carrier in a state of being coaxial and rotatable relative to each other (see, for example, Patent Documents 1 and 2).
JP-A-9-150640 JP 2003-14001 A

  However, in the conventional mounting structure described above, it is necessary to provide a “play” for assembling the spline fitting portion between the second member and the pinion shaft, that is, to provide a gap between the two splines. There is a problem that vibrations are generated by the rotational play caused by. Then, in order to suppress the vibration (vibration) of the second member due to the rotation backlash, the assembly can be performed by interposing a bearing that supports the second member in the radial direction between the first member or the differential carrier. This becomes complicated and contributes to the increase in the manufacturing cost.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mounting structure for a driving force transmission device that can suppress the occurrence of vibration due to rotation play with a simple configuration. Is to provide.

  In order to solve the above problems, the invention described in claim 1 is characterized in that a shaft-shaped first member coupled to a propeller shaft that transmits a driving force of a driving source, and a pinion that transmits the driving force to a differential device. A second member connected to a shaft and coaxially disposed with the first member and having a tubular portion disposed radially outward of the first member; and the tubular portion of the first member and the second member; And a driving force transmission mechanism capable of controlling the driving force transmitted between both members, wherein the first member is pivotally supported by a differential carrier that houses the differential device and a pinion shaft, and The two members are connected to the pinion shaft by spline fitting so that they can be rotated relative to each other and disposed in the differential carrier. A mounting structure of location, the spline fitting is summarized in that, to be performed by press-fitting the pinion shaft to said second member.

The gist of the invention described in claim 2 is that a predetermined lead angle is set to either the second member side or the pinion shaft side spline.
According to a third aspect of the present invention, a screw groove is threaded on the peripheral surface of the pinion shaft, and the press-fitting is between the nut that is screwed into the screw groove and contacts one end of the second member. The gist is that it is performed by a screw pair.

  According to a fourth aspect of the present invention, the first member has a hollow portion at an end portion on the pinion shaft side, and the tip of the pinion shaft is disposed in the hollow portion and between the hollow portion. It is supported by a bearing interposed in the gist.

  According to a fifth aspect of the present invention, the driving force transmission mechanism is a friction clutch mechanism, and includes an electromagnet and an operation unit that frictionally engages the friction clutch mechanism based on the magnetic force of the electromagnet. The electromagnet is fixed to the differential carrier and disposed between the first member and the cylindrical portion of the second member, and the operating portion is supported by the first member or the second member. This is the gist.

  According to a sixth aspect of the present invention, the differential carrier includes a cylindrical portion in which the driving force transmission device is disposed and a cover portion that closes an open end of the cylindrical portion, and the yoke of the electromagnet is the cover. The gist is to be formed integrally with the part.

(Action / Effect)
According to the configuration of the first aspect, it is possible to eliminate the gap between the spline on the pinion shaft side and the spline on the second member side, and to suppress the rotation play caused thereby. As a result, it is possible to suppress the vibration caused by the rotation play and to suppress the vibration of the second member, and thereby, between the second member and the first member or the differential carrier as in the conventional example. It is possible to reduce the cost and size of the bearing interposed between the two. In particular, in the case of employing an electromagnetic drive mechanism as in the configuration of claim 5, the second member is shaken to operate based on the electromagnet constituting the drive mechanism and the magnetic force of the electromagnet. There is a possibility that the distance between the parts changes and the driving force transmission performance and the control performance are deteriorated. In this regard, according to the above configuration, since the swing of the second member is suppressed, the variation in the distance between the electromagnet and the operating unit can be suppressed, and the driving force transmission performance and control performance as described above can be suppressed. The decrease can be prevented in advance. Therefore, it is particularly suitable for those employing such an electromagnetic drive mechanism.

  According to the configuration of the second aspect, it is possible to eliminate the gap between the two splines while ensuring “play” in the initial stage of fitting and ensuring good assembly. In addition, compared with the case where both splines are straight teeth and the gap is set to zero (or slightly minus), the force required for press-fitting is kept small, and the same press-fitting process is facilitated. can do.

According to the configuration of the third aspect, the press-fitting work can be performed without using a press-fitting machine or a special tool, and thus the press-fitting work can be facilitated.
According to the structure of Claim 4, the 1st member and the 2nd member are mutually supported in the location nearer the rotation center. Therefore, the vibration accompanying the rotation can be suppressed more suitably.

  According to the structure of Claim 6, the number of parts can be reduced and cost reduction can be achieved.

  ADVANTAGE OF THE INVENTION According to this invention, the attachment structure of the driving force transmission apparatus which can suppress generation | occurrence | production of the vibration resulting from rotation backlash with a simple structure can be provided.

Hereinafter, an embodiment in which the present invention is embodied in a driving force distribution device for a four-wheel drive vehicle will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a driving force transmission device, and FIG. 2 is a schematic configuration diagram of a vehicle (four-wheel drive vehicle) provided with the driving force transmission device.

  As shown in FIG. 2, the vehicle 1 is a four-wheel drive vehicle based on a front wheel drive vehicle, and a pair of front axles 4 are connected to a transaxle 3 assembled on one side of the engine 2. Further, a propeller shaft 5 is connected to the transaxle 3 together with the front axles 4, and the propeller shaft 5 is connected to a pinion shaft (drive pinion shaft) 7 via a driving force transmission device 6. . The pinion shaft 7 is connected to a pair of rear axles 9 via a rear differential 8 as a differential device. In the present embodiment, the driving force transmission device 6, the pinion shaft 7, and the rear differential 8 are accommodated in a differential carrier 10.

  That is, the driving force of the engine 2 is transmitted to the front wheels 11f via the front axle 4. When the propeller shaft 5 and the pinion shaft 7 are connected so as to be able to transmit torque by the driving force transmission device 6, the driving force of the engine 2 is transmitted from the pinion shaft 7 through the rear differential 8 and each rear axle 9 to the rear wheels. 11r is transmitted.

Next, the driving force transmission device of this embodiment and the mounting structure thereof will be described.
As shown in FIG. 1, the driving force transmission device 6 of this embodiment includes an inner shaft 12 as a first member connected to the propeller shaft 5, an outer housing 13 as a second member connected to the pinion shaft 7, And a main clutch 14 as a driving force transmission mechanism disposed between the inner shaft 12 and the outer housing 13. In the driving force transmission device 6, the inner shaft 12 is pivotally supported by the differential carrier 10, and the outer housing 13 is connected to the pinion shaft 7, so that the inner shaft 12 and the outer housing 13 are coaxial and relative to each other. It is accommodated in the differential carrier 10 in a rotatable state.

  More specifically, in the present embodiment, the differential carrier 10 is fixed to a differential carrier main body 15 that houses the pinion shaft 7 (and the rear differential 8), and one end of the differential carrier main body 15, whereby the driving force transmission device 6 is fixed. And a cover 17 that forms an accommodation space 16 in which is accommodated.

  Specifically, an opening 15a is formed at one end of the differential carrier main body 15, and the pinion shaft 7 is pivotally supported by bearings 18a and 18b, so that the tip 7a thereof extends from the opening 15a. In a protruding state, the differential carrier body 15 is rotatably accommodated. And the outer housing 13 is connected with the part protruded from the opening part 15a by spline fitting.

  On the other hand, the cover 17 is formed in a bottomed cylindrical shape, and a flange 21 extending outward in the radial direction is formed at the opening end. Further, a cylindrical fixing portion 19 is erected on the radially outer side of the opening portion 15a from which the pinion shaft 7 protrudes, and the opening end of the fixing portion 19 extends toward the radially outer side. A provided flange 20 is formed. The cover 17 is fixed to the differential carrier main body 15 by fastening the flange 21 and the flange 20 of the fixing portion 19. That is, in the present embodiment, the housing space 16 is formed by the internal space of the cover 17 and the fixing portion 19.

  An insertion hole 22 is formed in the bottom 17a of the cover 17 at a position corresponding to the opening 15a closed by the cover 17, that is, at a position coaxial with the pinion shaft 7 protruding from the opening 15a. Yes. The inner shaft 12 is inserted into the insertion hole 22 and is pivotally supported by a bearing 23 provided in the insertion hole 22 so that one end of the inner shaft 12 protrudes outside the differential carrier 10. It is housed in the housing space 16.

  In the present embodiment, a connecting member 24 for connecting the inner shaft 12 and the propeller shaft 5 is attached to the outer periphery of the inner shaft 12. The inner shaft 12 is inserted into the differential carrier 10 in a liquid-tight manner by a seal member 25 interposed between the connecting member 24 and the insertion hole 22.

  In the present embodiment, the outer housing 13 includes a cylindrical spline fitting portion 13a fitted to the pinion shaft 7, and a large diameter portion 13b having a larger diameter than the spline fitting portion 13a. The spline fitting portion 13a and the large diameter portion 13b are connected by a flange portion 13c. In the present embodiment, a cylindrical portion is formed by the large diameter portion 13b. The outer housing 13 has a large-diameter portion 13 b disposed on the radially outer side of the inner shaft 12.

  Further, in this embodiment, a hollow portion 12a is formed at the end portion (right side in the figure) of the inner shaft 12 on the pinion shaft 7 side. The pinion shaft 7 is a spline fitting portion 13a of the outer housing 13. Is inserted into the large-diameter portion 13b, and the tip 7a is inserted into the hollow portion 12a. And it is supported by the bearing 26 interposed between the hollow parts 12a.

  On the other hand, the main clutch 14 of the present embodiment is a multi-plate friction clutch mechanism in which a plurality of inner clutch plates 14a and outer clutch plates 14b are alternately arranged, and each inner clutch plate 14a is disposed on the outer periphery of the inner shaft 12. Each outer clutch plate 14b is spline-fitted to the inner periphery of the outer housing 13, and is supported so as to be movable along the axial direction. The inner clutch plate 14a and the outer clutch plate 14b are brought into contact with each other to be frictionally engaged or separated to be in a disengaged state, whereby the propeller shaft 5 connected to the inner shaft 12 and the outer housing 13 are brought into contact with each other. The pinion shaft 7 can be connected to the pinion shaft 7 so that torque can be transmitted, or can be disconnected.

  In addition, the driving force transmission device 6 of this embodiment includes an electromagnetic driving mechanism 30 for frictionally engaging the main clutch 14 (or changing the frictional engagement force). Specifically, the drive mechanism 30 of the present embodiment includes an electromagnet 31 that is a drive source, an armature 32 that is attracted and moved by the electromagnet 31, a pilot clutch 33 that is frictionally engaged by the movement of the armature 32, and the And a cam mechanism 34 for converting the frictional engagement force of the pilot clutch 33 into a force for pressing the main clutch 14. In this embodiment, the armature 32, the pilot clutch 33, and the cam mechanism 34 constitute an operating part. Each member constituting the drive mechanism 30 is disposed between the inner shaft 12 and the outer housing 13 together with the main clutch 14.

  More specifically, in the present embodiment, the main clutch 14 is provided in the vicinity of the flange portion 13c of the outer housing 13, and each member constituting the drive mechanism 30 is connected to the outer housing 13 from the main clutch 14 side. The cam mechanism 34, the armature 32, the pilot clutch 33, and the electromagnet 31 are arranged in this order toward the opening end side of the (large diameter portion 13b).

  Specifically, the cam mechanism 34 of the present embodiment includes a pair of cam members (35, 36) having an annular groove having a V-shaped cross section that is disposed so as to face each other and face each other. And a spherical cam follower 37 interposed between the two annular grooves, and has a known structure in which the cam members are separated from each other based on relative rotation of the cam members. In the present embodiment, the first cam 35 disposed on the electromagnet 31 side is supported by the inner shaft 12, and the second cam 36 disposed on the main clutch 14 side is spline fitted to the outer periphery of the inner shaft 12. By doing so, it is supported so as to be movable along its axial direction.

  The pilot clutch 33 is a multi-plate friction clutch mechanism similar to the main clutch 14. Each inner clutch plate 33a is disposed on the outer periphery of the first cam 35, and each outer clutch plate 33b is disposed on the inner periphery of the outer housing 13. By being spline-fitted, each is supported so as to be movable along the axial direction.

  Furthermore, in the present embodiment, an annular inner housing 38 having a magnet housing portion 38a having a U-shaped cross section is screwed to the open end of the outer housing 13 (large diameter portion 13b). 31 is arranged in the magnet housing portion 38a by being fixed to the bottom portion 17a of the cover 17 together with a yoke 40 as a yoke surrounding the electromagnet 31. The armature 32 is spline-fitted to the inner periphery of the outer housing 13 at a position where the pilot clutch 33 is sandwiched between the armature 32 and the electromagnet 31 (inner housing 38), and is supported so as to be movable along the axial direction. ing.

  That is, when the armature 32 is attracted by the energization of the electromagnet 31 and moves to the electromagnet 31 side, the pilot clutch 33 is frictionally engaged, thereby the first cam 35 and the second cam 36 constituting the cam mechanism 34. Rotates relative to each other. Based on the relative rotation between the first cam 35 and the second cam 36, the second cam 36 moves toward the main clutch 14 so as to be separated from the first cam 35, and the second cam 36 When the inner clutch plate 14a is pressed, the main clutch 14 is frictionally engaged.

  That is, by controlling the energization amount to the electromagnet 31 and changing its magnetic force, the frictional engagement force of the pilot clutch 33 is changed, and thereby the relative rotational speed between the first cam 35 and the second cam 36, that is, The force that presses the main clutch 14 (inner clutch plate 14a) changes. Therefore, it is possible to control the friction engagement force of the main clutch 14, that is, the driving force transmitted from the propeller shaft 5 to the pinion shaft 7 by controlling the energization amount to the electromagnet 31.

  Next, the connection structure between the driving force transmission device (outer housing) and the pinion shaft in the present embodiment will be described in detail. FIG. 3 is a schematic diagram illustrating a schematic configuration of a spline fitting portion between the outer housing and the pinion shaft.

  As described above, when the driving force transmission device 6 (outer housing 13) and the pinion shaft 7 are simply connected by spline fitting as in the conventional configuration, the gap is formed between the two splines. There is a problem that vibration is generated by the rotation play.

  Considering this point, in the present embodiment, the pinion shaft 7 is press-fitted into the spline fitting portion 13a of the outer housing 13, thereby eliminating the gap between the two splines. More specifically, as shown in FIG. 3, in the present embodiment, the spline fitting portion 13 a on the outer housing 13 side is formed with a straight tooth spline 41, whereas each spline on the pinion shaft 7 side. A predetermined lead angle θ is set at 42. In the present embodiment, the lead angle θ is set to about ten minutes. Then, the pinion shaft 7 is press-fitted into the spline fitting portion 13a so as to push the splines 42 having the lead angle θ set between the splines 41 on the outer housing 13 side. The gap between them can be eliminated.

  More specifically, as shown in FIG. 1, in the present embodiment, a screw groove (not shown) is provided on the outer periphery of the pinion shaft 7 on the tip 7a side of the spline fitting portion 43 in which the splines 42 are formed. ) Is threaded. The pinion shaft 7 has its tip 7a inserted into the outer housing 13, and the nut 45 is screwed into the screw portion 44, whereby the spline fitting portion 43 is connected to the spline fitting portion 13a on the outer housing 13 side. It is designed to be press-fitted inside.

  That is, when the nut 45 is screwed to the screw portion 44, the nut 45 is brought into contact with the flange portion 13c of the outer housing 13, and by tightening the nut 45 in this state, the pinion shaft 7 is moved to the screw portion. The screw pair between the nut 44 and the nut 45 moves into the outer housing 13. In the present embodiment, the pinion shaft 7 is configured such that the spline fitting portion 43 is press-fitted into the spline fitting portion 13a on the outer housing 13 side by this screw pair couple force. In the present embodiment, the spline fitting by press-fitting similar to the above configuration is also adopted in the connecting portion between the inner shaft 12 and the connecting member 24.

As described above, according to the present embodiment, the following features can be obtained.
(1) The spline fitting between the driving force transmission device 6 (outer housing 13) and the pinion shaft 7 is performed by press-fitting the pinion shaft 7 into the spline fitting portion 13a of the outer housing 13.

  With such a configuration, it is possible to eliminate the gap between the splines 42 on the pinion shaft 7 side and the splines 41 on the outer housing 13 side, thereby suppressing the rotational play caused by this. As a result, it is possible to suppress the vibration caused by the rotation backlash and to suppress the shake of the outer housing 13, thereby interposing between the outer housing 13 and the differential carrier 10 as in the conventional example. The bearing (see Patent Document 1) can be eliminated, and its cost and size can be reduced.

  Further, when the outer housing 13 is shaken, the distance to the armature 32 provided on the outer housing 13 side (specifically, the inner housing 38 in which a magnetic flux path is formed) changes, and the driving force transmission performance, In addition, the control performance may be reduced. In this respect, according to the above configuration, since the deflection of the outer housing 13 is suppressed, such a variation in the distance between the electromagnet 31 and the armature 32 can be suppressed, and the driving force transmission performance and the control performance as described above can be suppressed. The decrease can be prevented in advance. Therefore, the present invention is particularly suitable for a device that employs an electromagnetic drive mechanism 30 such as the drive force transmission device 6 of the present embodiment.

(2) A straight tooth spline 41 is formed in the spline fitting portion 13a on the outer housing 13 side, and a predetermined lead angle θ is set for each spline 42 on the pinion shaft 7 side.
With such a configuration, it is possible to eliminate the gap between the splines 41 and 42 while ensuring “play” in the initial stage of fitting and ensuring good assembly. In addition, the force required for press-fitting is kept small compared to the case where the gaps are set to zero (or slightly minus) while the splines on the outer housing 13 side and the pinion shaft 7 side are both straight teeth. Thus, the press-fitting process can be facilitated.

  (3) A screw portion 44 having a screw groove is formed on the outer peripheral surface of the pinion shaft 7, and the press-fitting is performed with the nut 45 that is screwed into the screw portion 44 and contacts the flange portion 13 c of the outer housing 13. It is performed by the screw pair between. Therefore, the press-fitting operation can be performed without using a press-fitting machine or a special tool.

  (4) The pinion shaft 7 is inserted from the spline fitting portion 13a of the outer housing 13 to the large diameter portion 13b, and the tip 7a thereof is inserted into the cylinder of the inner shaft 12. And it is supported by the bearing 26 interposed between the inner periphery of the inner shaft 12.

  With such a configuration, the outer housing 13 and the inner shaft 12 are supported by each other at a location closer to the rotation center. Therefore, the vibration accompanying the rotation can be suppressed more suitably.

In addition, you may change each said embodiment as follows.
In the present embodiment, the present invention is embodied in the electromagnetic drive type driving force transmission device 6 including the drive mechanism 30 using the electromagnet 31 as a drive source. It may be embodied.

  In the present embodiment, the press-fitting is performed by the screw portion 44 having a screw groove formed in the outer peripheral surface of the pinion shaft 7 and the nut 45 that is screwed into the screw portion 44 and abuts on the flange portion 13c of the outer housing 13. It was decided to be performed by a screw pair between. However, the present invention is not limited to this, and a configuration that uses a press-fitting machine or a special tool may be employed.

  In the present embodiment, the inner shaft 12 is liquid-tight by the sealing member 25 interposed between the connecting member 24 attached to the inner shaft 12 and the insertion hole 22 formed in the bottom portion 17a of the cover 17. It was decided to be inserted into the differential carrier 10. However, the present invention is not limited to this, and a seal member is provided between the inner housing 38 and the outer housing 13 and between the inner housing 38 and the inner shaft 12, and the accommodation space 16 in which the driving force transmission device 6 is accommodated is filled with hydraulic oil. It is good also as a structure which is not performed.

  In the present embodiment, a predetermined lead angle θ is set for each spline 42 on the pinion shaft 7 side, but this lead angle θ may be set on the spline 41 on the outer housing 13 side.

  In the present embodiment, the electromagnet 31 is fixed to the bottom portion 17 a of the cover 17 constituting the differential carrier 10 together with the yoke 40 serving as a yoke surrounding the electromagnet 31. However, the invention is not limited thereto, and a yoke 40 as a yoke may be formed integrally with the differential carrier 10. By adopting such a configuration, the number of parts can be reduced and the cost can be reduced.

  In this case, as shown in FIG. 4, a fixing portion 49 is extended in the axial direction, and the fixing space 49 serving as the cylindrical portion constitutes most of the accommodation space 16. And while closing the opening end of the fixing | fixed part 49, about the cover 50 as a cover part in which the yoke part 50a equivalent to the yoke 40 is formed, it is good to suppress the cylindrical part as much as possible. That is, the cover 50 is formed of an iron-based metal by integrally forming the yoke portion 50a. Therefore, with this configuration, an increase in the weight can be minimized.

The schematic block diagram of a driving force transmission device. The schematic block diagram of the vehicle provided with the driving force transmission apparatus. The schematic diagram which shows schematic structure of a spline fitting part. The schematic block diagram of the driving force transmission apparatus of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 5 ... Propeller shaft, 6 ... Driving force transmission device, 7 ... Pinion shaft, 7a ... Tip, 10 ... Differential carrier, 12 ... Inner shaft, 12a ... Hollow part, 13 ... Outer housing, 13a, 43 ... Spline fitting part, 13b ... large diameter portion, 13c ... flange portion, 14 ... main clutch, 16 ... housing space, 17,50 ... cover, 30 ... drive mechanism, 31 ... electromagnet, 32 ... armature, 33 ... pilot clutch, 34 ... cam mechanism, 40 ... Yoke, 41,42 ... Spline, 44 ... Screw part, 45 ... Nut, 19,49 ... Fixing part, 50a ... Yellow part, θ ... Lead angle.

Claims (6)

A shaft-shaped first member connected to a propeller shaft that transmits a driving force of a driving source, and a first member that is connected to a pinion shaft that transmits the driving force to a differential device and is coaxially arranged with the first member. The second member having a cylindrical portion disposed on the radially outer side of the first member and the driving force transmitted between the two members disposed between the first member and the cylindrical portion of the second member can be controlled. The first member is pivotally supported by a differential carrier that houses the differential device and the pinion shaft, and the second member is connected to the pinion shaft by spline fitting. A drive force transmission device mounting structure disposed in the differential carrier so as to be rotatable relative to each other;
The spline fitting is performed by press-fitting the pinion shaft into the second member. In the mounting structure of the driving force transmission device according to claim 1,
A mounting structure for a driving force transmission device, wherein a predetermined lead angle is set to either the spline on the second member side or the pinion shaft side. In the mounting structure of the driving force transmission device according to claim 1 or 2,
A screw groove is threaded on the peripheral surface of the pinion shaft, and the press-fitting is performed by a screw pair between a nut that is screwed into the screw groove and abuts against one end of the second member;
A drive force transmission device mounting structure characterized by the above. In the mounting structure of the driving force transmission device according to any one of claims 1 to 3,
The first member is formed with a hollow portion at the end on the pinion shaft side,
The pinion shaft has a distal end disposed in the hollow portion and supported by a bearing interposed between the pinion shaft and the pinion shaft. In the mounting structure of the driving force transmission device according to any one of claims 1 to 4,
The driving force transmission mechanism is a friction clutch mechanism,
An electromagnetic drive mechanism having an electromagnet and an operating portion that frictionally engages the friction clutch mechanism based on the magnetic force of the electromagnet;
The electromagnet is fixed to the differential carrier and disposed between the cylindrical portion of the first member and the second member, and the operating portion is supported by the first member or the second member. A mounting structure of a driving force transmission device as a feature. In the mounting structure of the driving force transmission device according to claim 5,
The differential carrier includes a cylindrical portion in which the driving force transmission device is disposed and a cover portion that closes an open end of the cylindrical portion, and a yoke of the electromagnet is formed integrally with the cover portion. A drive force transmission device mounting structure characterized by the above.

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