JP2009036323A - Driving power transmitting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving power transmitting apparatus which can reduce its weight and axial length without lowering its torque transmitting efficiency. <P>SOLUTION: A connecting member 2 comprises a shaft portion 2a into which a driving power is input, a connecting member side fitting portion 2c to be fitted into the fitting portion 3a of a front housing 3, and engaging projections 2i for engaging with the engaged projections 3c of the front housing 3 on the outer circumferential side of the connecting member side fitting portion 2c. Further, the front housing 3 and the connecting member 2 are connected irrotationally by restricting the axial movement by the nut 2f provided on the outer circumference of the connecting member side fitting portion 2c so as to axially engage with the fitting portion 3a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a driving force transmission device.

Conventionally, a driving force transmission device provided in a vehicle transmits torque between two shafts. The first rotating body of the driving force transmission device is formed in a bottomed cylindrical shape and is connected to the shaft on the driving source side, and rotates by the input of the driving force. A second rotating body formed in an axial shape is rotatable in the cylinder of the first rotating body and is coaxially arranged with the first rotating body. Between the first rotating body and the second rotating body, both A clutch is arranged as a coupling mechanism that couples the motors so as to transmit torque. The driving force transmission device has a structure in which an input shaft portion is erected on the outer surface of the bottom of the first rotating body (see Patent Document 1), and is formed on the shaft on the driving source side, as a configuration that is coupled to the shaft on the driving source side. There is one in which the bottom portion of the first rotating body is fastened to the flange portion with a bolt (see Patent Document 2).
JP 2004-332758 A Japanese Patent No. 3256737

  By the way, in the driving force transmission device that controls the engaging force of the coupling mechanism by the applied current to the electromagnetic coil, a first rotating body formed of a nonmagnetic material such as an aluminum alloy may be used. However, in the case where the input shaft portion is erected on the outer surface of the bottom portion of the first rotating body as in Patent Document 1, it is difficult to transmit a sufficient driving force via the input shaft portion having a relatively small diameter. There are cases where such a configuration cannot be obtained. In addition, as in Patent Document 2, in the case where the bottom portion of the first rotating body is fastened to the flange portion with the bolt, the bolt is screwed to the bottom portion of the first rotating body from the flange side. A space (or thickness of the bottom portion) for forming the film is required. In addition, since a plurality of insertion holes are formed in the flange, it is necessary to increase the thickness of the flange in order to avoid a decrease in strength associated therewith. For this reason, the configuration is disadvantageous from the viewpoint of weight reduction and size reduction, particularly shortening of the shaft length, and there remains room for improvement in this respect.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a driving force transmission device that can be reduced in weight and shortened without causing a decrease in torque transmission efficiency. There is.

  In order to solve the above-mentioned problems, the invention according to claim 1 includes a first rotating body formed in a cylindrical shape and a second rotating body that is coaxially arranged rotatably in a cylinder of the first rotating body. A coupling mechanism that is disposed between the first rotating body and the second rotating body and connects the first rotating body and the second rotating body so as to be able to transmit torque, and a relative rotation to the first rotating body. A driving force transmission device including a connecting member that is connected in an incapable manner, wherein the first rotating body has an engaging portion that engages with the connecting member on one end side in the axial direction, and the engaging portion A coupling portion formed on the inner peripheral side of the coupling member, the coupling member including a shaft portion to which a driving force is input, a coupling member side fitting portion to be fitted into the fitting portion, and the coupling member side A coupling member-side engaging portion that engages with an engaging portion of the first rotating body in a circumferential direction on an outer peripheral side of the fitting portion; and the first rotating body and the connecting member The movement is restricted in the axial direction by a retaining portion that is provided on the outer periphery of the coupling member side fitting portion and engages with the fitting portion in the axial direction, and is connected in a relatively non-rotatable manner. .

  According to the above configuration, the connecting member and the first rotating body are provided in the outer periphery of the connecting member side fitting portion of the connecting member, and are axially provided by the retaining portion that engages with the fitting portion of the first rotating body in the axial direction. Therefore, a space for forming a bolt hole (or a thickness of the bottom portion) is not required at the bottom of the first rotating body, thereby shortening the axial length. Can be planned. In addition, it is not necessary to form a bolt insertion hole in the flange portion, and it is not necessary to form the flange portion thick in the axial direction in order to suppress a decrease in strength of the flange portion due to the formation of the insertion hole. As a result, it is possible to reduce the thickness of the flange portion and further reduce the axial length and weight. And the relative rotation between a connection member and a 1st rotary body is controlled by engaging the connection member side engagement part of a connection member, and the engagement part of a 1st rotary body in the circumferential direction, thereby High torque transmission efficiency can be ensured. As a result, the weight can be reduced and the shaft can be shortened without reducing the torque transmission efficiency.

The gist of the invention described in claim 2 is that an axial gap is provided between the connecting member and the first rotating body in a state where the connecting member is connected to the first rotating body. To do.
According to the said structure, the material which comprises a connection member, and a 1st rotary body with the axial clearance gap provided between the connection member and the 1st rotary body in the state which connected the connection member and the 1st rotary body. Thermal stress due to the difference in coefficient of thermal expansion with the constituent material can be relaxed. As a result, thermal fatigue failure due to thermal stress due to the difference in thermal expansion coefficient between the connecting member and the first rotating body can be suitably prevented.

The gist of the invention described in claim 3 is that the second rotating body is rotatably supported by a bearing provided between the connecting member side fitting portion.
According to this invention, the 2nd rotary body arrange | positioned in the cylinder of a 1st rotary body is supported by the connection member. For this reason, it becomes easy to make the rotation center of a connection member and the rotation center of a 2nd rotary body correspond, and it prevents suitably the vibration resulting from the rotation center of a connection member and the rotation center of a 2nd rotation body shifting. Can do.

The gist of the invention described in claim 4 is that the coupling member side fitting portion is fitted into the fitting portion, and a nut is screwed onto the outer peripheral surface as the retaining portion.
According to the said structure, a connection member and a 1st rotary body can be connected with an easy structure by screwing a nut to the outer peripheral surface of the connection member side fitting part of a connection member.

  ADVANTAGE OF THE INVENTION According to this invention, the driving force transmission device which can aim at weight reduction and shortening without causing the fall of torque transmission efficiency can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1A, the connecting member 2 of the driving force transmission device 1 of the present embodiment is connected to a propeller shaft (not shown), and a driving force generated by an engine (not shown) as a driving source is generated. Entered. The connecting member 2 is made of iron-based metal and includes a shaft portion 2a that is connected to the propeller shaft. A flange portion 2b is formed to extend outward in the radial direction at the end of the shaft portion 2a opposite to the input side (right side in FIG. 1A). In this embodiment, the flange part 2b is formed in the substantially disc shape of a predetermined diameter. A front housing 3 as a first rotating body is provided on the non-input side (right side in FIG. 1A) of the flange portion 2b. The front housing 3 is made of a nonmagnetic material (for example, aluminum alloy) and is formed in a cylindrical shape having an outer diameter substantially equal to the outer diameter of the flange portion 2b. An annular plate-like fitting portion 3a is formed along the radial inner side at the input side (left side in the figure) end portion of the front housing 3, and the axial outer surface S thereof faces the flange portion 2b. ing. The front housing 3 is arranged coaxially with the shaft portion 2 a of the connecting member 2, and the front housing 3 is in a state where the flange portion 2 b of the connecting member 2 is arranged to face the axial outer surface S of the fitting portion 3 a of the front housing 3. 3 is connected.

  More specifically, the connecting member 2 includes an annular connecting member side fitting portion 2c that extends from the flange portion 2b in the axial direction to the non-input side (right side in FIG. 1A) and engages with the front housing 3. ing. The connecting member-side fitting portion 2c of the connecting member 2 has an outer diameter substantially equal to the inner diameter of the fitting portion 3a of the front housing 3 at the center portion of the flange portion 2b of the connecting member 2 opposite to the shaft portion 2a. It has a substantially cylindrical shape. A threaded portion 2e is formed at the distal end portion of the outer peripheral surface 2g of the connecting member side fitting portion 2c. In this embodiment, the coupling member side fitting portion 2 c of the coupling member 2 is fitted into the fitting portion 3 a of the front housing 3, and the screw portion 2 e of the coupling member side fitting portion 2 c is placed in the cylinder of the front housing 3. In the arranged state, a nut 2f as a retaining portion is screwed from the inner side of the front housing 3 to the screw portion 2e of the coupling member side fitting portion 2c.

  Further, as shown in FIG. 1B, in a state where the connecting member 2 is connected to the front housing 3, the nut 2f provided on the connecting member side fitting portion 2c and the fitting portion 3a of the front housing 3 are connected. An axial gap C is provided between them. Further, a seal member 4 is interposed between the outer peripheral surface 2g of the connecting member side fitting portion 2c of the connecting member 2 and the inner peripheral surface 3b of the fitting portion 3a of the front housing 3, whereby the front housing 3 And the connecting member side fitting portion 2c are secured, and leakage of the lubricating oil in the front housing 3 is prevented.

  A ball bearing 5 is fixed to the inner periphery of the connecting member-side fitting portion 2 c of the connecting member 2. Further, an oil reservoir 2h as a space for storing lubricating oil filled in the front housing 3 is recessed in the flange portion 2b of the connecting member 2 at a portion radially inward of the connecting member side fitting portion 2c. ing.

  As shown in FIG. 2, on the surface 2d of the flange portion 2b opposite to the shaft portion 2a, on the radially outer side of the connecting member side fitting portion 2c, there are a plurality of engaging convex portions 2i as engaging portions. Are formed radially, and on the axially outer surface S of the fitting portion 3a of the front housing 3, a plurality of engaged protrusions 3c as connecting member side engaging portions are formed radially (FIG. 1). (See (a)). In a state where the connecting member 2 and the front housing 3 are connected, each engaging convex portion 2i is disposed between the engaging convex portions 3c adjacent in the circumferential direction.

  In addition, an annular rear housing 6 is fitted to the opening end 3d of the front housing 3, and one end of the inner shaft 7 as the second rotating body is inserted into the central hole 6a of the rear housing 6. Thus, it is rotatably supported in the cylinder of the front housing 3 by the slide bearing 8 provided in the central hole 6a and the ball bearing 5 provided in the cylinder of the front housing 3. The inner shaft 7 is formed in a hollow shaft shape, and a connecting portion (spline fitting portion) 7a (not shown) with a rear differential (not shown) is formed on the inner periphery of the shaft end on the rear housing 6 side (right side in the figure). Has been.

  Further, in the cylinder of the front housing 3, a main clutch 14 capable of connecting the front housing 3 and the inner shaft 7 so that torque can be transmitted, and the axial direction of the main clutch 14, the rear housing 6 side (FIG. 1 (a)). A pilot clutch 15 juxtaposed in the middle and right side) and a cam mechanism 16 interposed between the main clutch 14 and the pilot clutch 15 are provided. The main clutch 14 corresponds to the coupling mechanism in the present invention.

  In the present embodiment, the main clutch 14 employs a multi-plate friction clutch in which a plurality of outer clutch plates 17 and inner clutch plates 18 provided so as to be movable in the axial direction are alternately arranged. Specifically, each outer clutch plate 17 is splined to the inner periphery of the front housing 3 and each inner clutch plate 18 is splined to the outer periphery of the inner shaft 7, so that each outer clutch plate 17 can move in the axial direction and has a corresponding front. The housing 3 or the inner shaft 7 is provided so as to be rotatable together.

  In the main clutch 14 of the present embodiment, the outer clutch plate 17 and the inner clutch plate 18 are pressed in the axial direction and frictionally engaged with each other, thereby coupling the front housing 3 and the inner shaft 7, that is, transmitting torque. It is comprised so that it may connect.

  On the other hand, the cam mechanism 16 can rotate integrally with the inner shaft 7 by being spline-fitted to the outer periphery of the inner cam 7 and the first cam 19 provided rotatably by being supported by the inner shaft 7. A second cam 20 provided so as to be movable in the axial direction and a ball member 21 interposed between the first cam 19 and the second cam 20 are provided.

  In the present embodiment, the first cam 19 and the second cam 20 are both formed in a disc shape, and the first cam 19 is disposed on the rear housing 6 side, and the second cam 20 is disposed on the main clutch 14 side. The outer peripheral surface of the first cam 19 is spline-fitted with the pilot clutch 15 (the inner peripheral end of the inner clutch plate 24), and the second cam 20 is spline-fitted with the outer periphery of the inner shaft 7. A plurality of U-shaped grooves (not shown) are formed on the opposing surfaces of the first cam 19 and the second cam 20 so as to oppose each other, and the ball member 21 is disposed in each of the opposing U-shaped grooves. It is clamped by the first cam 19 and the second cam 20 in the disposed state. In the cam mechanism 16 of the present embodiment, the first cam 19 and the second cam 20 rotate relative to each other, so that the first cam 19 and the second cam 20 are separated from each other, that is, the first cam as a cam member. The two cams 20 are configured to move in the axial direction toward the main clutch 14 side.

  Further, the pilot clutch 15 as the second clutch is a multi-plate type in which a plurality of outer clutch plates 23 and inner clutch plates 24 which are provided so as to be movable in the axial direction are alternately arranged in the same manner as the main clutch 14. The friction clutch is adopted. Specifically, each outer clutch plate 23 is spline-fitted to the inner periphery of the front housing 3 and the inner clutch plate 24 is spline-fitted to the outer periphery of the first cam 19, so that each of the outer clutch plates 23 can move in the axial direction. The front housing 3 or the first cam 19 is provided so as to be rotatable together. The pilot clutch 15 according to the present embodiment can transmit torque between the front housing 3 and the first cam 19 by pressing the outer clutch plate 23 and the inner clutch plate 24 in the axial direction and frictionally engaging each other. It is comprised so that it may connect.

  That is, the first cam 19 having the ball member 21 sandwiched between it and the second cam 20 is in a state of rotating integrally with the second cam 20, that is, the inner shaft 7 when the pilot clutch 15 is not operated. A rotational difference corresponding to the rotational difference between the front housing 3 and the inner shaft 7 is generated between the front housing 3 and the first cam 19. The pilot clutch 15 is connected to the front housing 3 and the first cam 19 so as to be able to transmit torque by the operation thereof, so that the torque based on the rotational difference between the front housing 3 and the inner shaft 7 (first cam 19). Is transmitted to the cam mechanism 16.

  That is, in the driving force transmission device 1 of the present embodiment, the torque based on the rotational difference between the front housing 3 and the inner shaft 7 is transmitted to the cam mechanism 16 by the operation of the pilot clutch 15, and the cam mechanism 16 Based on the rotational difference between the first cam 19 and the second cam 20 that occurs, the second cam 20 is moved to the axial main clutch side. That is, the cam mechanism 16 converts the torque based on the rotational difference between the front housing 3 and the inner shaft 7 transmitted via the pilot clutch 15 into a pressing force in the axial direction. When the second cam 20 presses the main clutch 14, the main clutch 14 is operated, that is, the front housing 3 and the inner shaft 7 are connected so as to transmit torque.

  Here, the pilot clutch 15 of the present embodiment is configured as an electromagnetic clutch using the electromagnet 25 as a drive source. Specifically, the rear housing 6 is formed with an annular groove 26 that opens to the outside of the front housing 3 (on the side opposite to the front housing, the right side in FIG. 1A). It is accommodated in the groove 26. In the present embodiment, the rear housing 6 is provided with a cylindrical portion 6b extending from the central hole 6a in the axial direction to the front housing side, and the electromagnet 25 is a ball bearing provided in the cylindrical portion 6b. 27 is supported by the rear housing 6 (and the front housing 3) so as to be relatively rotatable.

  In this embodiment, seal members 28 a and 28 b are interposed between the outer periphery of the rear housing 6 and the inner periphery of the front housing 3, and between the inner periphery of the rear housing 6 and the outer periphery of the inner shaft 7. ing. That is, it is surrounded by the cylinder of the front housing 3 that accommodates the main clutch 14 and the pilot clutch 15, specifically, the inner periphery of the front housing 3, the flange portion 2 b of the connecting member 2, the outer periphery of the inner shaft 7, and the rear housing 6. The space is liquid-tight, and the space is filled with lubricating oil. The main clutch 14 and the pilot clutch 15 are configured as a wet friction clutch mechanism in which the inner clutch plates 18 and 24 and the outer clutch plates 17 and 23 are frictionally engaged with each other with lubricating oil interposed therebetween. Yes.

  An annular armature 29 is formed in the cylinder of the front housing 3 in the axial direction at a position where the outer clutch plate 23 and the inner clutch plate 24 are sandwiched between the armature 29 and the rear housing 6. The spline is slidably fitted. The pilot clutch 15 according to the present embodiment is such that the armature 29 is attracted by the electromagnetic force of the electromagnet 25 and moves so as to sandwich the outer clutch plate 23 and the inner clutch plate 24 between the armature 29 and the rear housing 6. The outer clutch plate 23 and the inner clutch plate 24 are configured to be frictionally engaged. In the present embodiment, since the front housing 3 is made of a nonmagnetic material, magnetic flux leakage is prevented thereby, and a magnetic circuit as shown by a chain line in FIG. 1 is formed.

  As described above, in the driving force transmission device 1 according to the present embodiment, the operation (friction engagement force) of the pilot clutch 15 can be controlled through power supply to the electromagnet 25. The operation of the main clutch 14, that is, the driving force that can be transmitted between the front housing 3 and the inner shaft 7 can be freely controlled through the operation of the pilot clutch 15.

Next, the operation of the connecting structure of the connecting member and the front housing configured as described above will be described.
In the present embodiment, the connecting member side fitting portion 2 c of the connecting member 2 is fitted into the fitting portion 3 a of the front housing 3. Thereby, the connecting member 2 and the front housing 3 are engaged in the radial direction, and the movement of the connecting member 2 in the radial direction with respect to the front housing 3 is restricted. Further, in a state where the connecting member side fitting portion 2c of the connecting member 2 is fitted into the fitting portion 3a of the front housing 3, the screw portion 2e of the connecting member side fitting portion 2c is connected to the screw portion 2e of the connecting member side fitting portion 2c. A nut 2f as a retaining portion is screwed. Thus, the inner end 3e of the fitting portion 3a of the front housing 3 is disposed between the flange portion 2b of the connecting member 2 and the nut 2f, and the fitting portion 3a of the front housing 3 is the flange portion 2b of the connecting member 2. Alternatively, the nut 2f is engaged in the axial direction, and the axial movement of the connecting member 2 relative to the front housing 3 is restricted. Further, in a state where the connecting member 2 and the front housing 3 are connected, each engaging convex portion 2i of the connecting member 2 is disposed between the engaged convex portions 3c adjacent in the circumferential direction. Thereby, the connecting member 2 is engaged with the front housing 3 in the circumferential direction, and efficient torque transmission is possible. That is, the connecting member 2 and the front housing 3 can be connected so as to transmit torque without using bolts.

  Further, as shown in FIG. 1B, in a state where the connecting member 2 and the front housing 3 are connected, a nut 2f provided on the connecting member side fitting portion 2c and the fitting portion 3a of the front housing 3 A gap C in the axial direction is provided between the two. As a result, thermal expansion of the connecting member 2 and the front housing 3 is allowed by the gap C, and due to the difference in thermal expansion coefficient between the material constituting the front housing 3 and the material constituting the connecting member 2 due to the gap C. Thermal stress to be relieved.

  Moreover, the engaging convex part 2i of the connection member 2 is provided in the radial direction outer side rather than the connection member side fitting part 2c. Thereby, the engagement convex part 2i provided in the radial direction outer side than the connection member side fitting part 2c and the to-be-engaged convex part 3c formed in the axial direction outer surface S of the front housing 3 engage. Thus, torque transmission is performed at a position where the shaft center is separated in the radial direction.

  Further, as shown in FIG. 1A, a ball bearing 5 is fixed to the inner periphery of the connecting member side fitting portion 2 c of the connecting member 2, and the inner shaft 7 is connected via the ball bearing 5. The connecting member 2 is supported rotatably. Thereby, it becomes easy to make the rotation center of the connecting member 2 coincide with the rotation center of the inner shaft 7.

As described above, according to the present embodiment, the following operations and effects can be obtained.
(1) The connecting member 2 includes a shaft portion 2a to which a driving force is input, a connecting member side fitting portion 2c that is fitted into the fitting portion 3a of the front housing 3, and an outer periphery of the connecting member side fitting portion 2c. On the side, an engaged convex portion 3c of the front housing 3 and an engaging convex portion 2i engaged in the circumferential direction are provided. The front housing 3 and the connecting member 2 are provided on the outer periphery of the connecting member-side fitting portion 2c and are restricted from moving in the axial direction by a nut 2f that engages with the fitting portion 3a in the axial direction, so that relative rotation is impossible. Connected to

  According to the above configuration, the connecting member 2 and the front housing 3 are restricted from moving in the axial direction by the nut 2f that is provided on the outer periphery of the connecting member side fitting portion 2c and engages the fitting portion 3a in the axial direction. Are connected. For this reason, a space for forming a bolt hole (or thickness of the bottom) is not required at the bottom of the front housing 3, thereby shortening the axial length. In addition, it is not necessary to form a bolt insertion hole in the flange portion 2b, and it is not necessary to form the flange portion 2b thick in the axial direction in order to suppress a decrease in strength of the flange portion 2b due to the formation of the insertion hole. As a result, the flange portion 2b can be made thinner to further reduce the axial length and weight. And by engaging the engaging convex part 2i of the connecting member 2 and the engaged convex part 3c of the front housing 3 in the circumferential direction, the relative rotation between the connecting member 2 and the front housing 3 is restricted, Thereby, high torque transmission efficiency can be ensured. As a result, the weight can be reduced and the shaft can be shortened without reducing the torque transmission efficiency.

  (2) In a state where the connecting member 2 is connected to the front housing 3, an axial gap C is provided between the connecting member 2 (nut 2f) and the fitting portion 3a (inner end portion 3e) of the front housing 3. It was.

  According to the above configuration, the material constituting the connecting member 2 and the front housing are formed by the axial gap C provided between the connecting member 2 and the front housing 3 in a state where the connecting member 2 and the front housing 3 are connected. The thermal stress resulting from the difference in thermal expansion coefficient with the material constituting 3 can be relaxed. As a result, thermal fatigue failure due to thermal stress due to the difference in thermal expansion coefficient between the connecting member 2 and the front housing 3 can be suitably prevented.

(3) The inner shaft 7 is rotatably supported by a ball bearing 5 provided between the connecting member 2 and the connecting member side fitting portion 2c.
According to the present invention, the inner shaft 7 disposed in the cylinder of the front housing 3 is supported by the connecting member 2. For this reason, it becomes easy to make the rotation center of the connecting member 2 and the rotation center of the inner shaft 7 coincide with each other, and it is possible to suitably prevent vibration caused by the shift of the rotation center of the connecting member 2 and the rotation center of the inner shaft 7. Can do.

(4) The connecting member side fitting portion 2c of the connecting member 2 is fitted into the fitting portion 3a of the front housing 3, and a nut 2f is screwed to the outer peripheral surface 2g as a retaining portion.
According to the said structure, the connection member 2 and the front housing 3 can be connected with an easy structure by screwing the nut 2f to the outer peripheral surface 2g of the connection member side fitting part 2c of the connection member 2. FIG.

(5) The engaging convex part 2i of the connection member 2 was provided in the radial direction outer side rather than the connection member side fitting part 2c.
According to the above configuration, the connecting member 2 and the front housing 3 are formed by the engaging convex portion 2i of the connecting member 2 and the engaged convex portion 3c of the front housing 3 provided on the radially outer side than the connecting member side fitting portion 2c. By engaging in the circumferential direction, torque transmission is performed at a position away from the axial center in the radial direction. For this reason, the area of the engagement convex part 2i and the to-be-engaged convex part 3c required for torque transmission can be made smaller, and it becomes possible to reduce in size further.

In addition, you may change this embodiment as follows.
-In this embodiment, the engagement convex part 2i provided in the flange part 2b of the connection member 2 and the to-be-engaged convex part 3c provided in the axial direction outer surface S of the front housing 3 are engaged in the circumferential direction, and it connects. Although the member 2 and the front housing 3 are not relatively rotatable, the present invention is not limited to such a mode. For example, as shown in FIG. 3, the flange portion 2 b of the connecting member 2 is provided with a substantially cylindrical facing portion 30 that faces the front housing 3 in the radial direction, and the engagement convex portion 31 provided on the facing portion 30 and the front The engaging projection 32 provided on the outer peripheral surface of the housing 3 may be engaged in the circumferential direction so that the connecting member 2 and the front housing 3 cannot be rotated relative to each other.

  In this embodiment, in the state where the connecting member 2 and the front housing 3 are connected, an axial gap C is provided between the nut 2f of the connecting member side fitting portion 2c and the fitting portion 3a of the front housing 3. Although provided, the connecting member 2 and the front housing 3 may be fastened together with the nut 2f so as not to be relatively displaced.

  In the present embodiment, the engaging convex portion 2i is provided on the flange portion 2b of the connecting member 2 and the engaged convex portion 3c is provided on the front housing 3, but the engaging convex portion 2i formed on the flange portion 2b An engaged recess to be engaged may be provided in the front housing 3. Moreover, you may provide the engaging recessed part engaged with the to-be-engaged convex part 3c formed in the front housing 3 in the flange part 2b.

  In the present embodiment, the flange portion 2b of the connecting member 2 is provided with a plurality of engaging projections 2i radially, and the engagement surface 3a of the fitting portion 3a of the front housing 3 has a plurality of engaged projections. Although the portions 3c are provided radially, the shapes of the engaging protrusions 2i and the engaged protrusions 3c can be appropriately changed as long as the connecting member 2 and the front housing 3 can be engaged in the circumferential direction. . For example, the engaging convex part 2i and the engaged convex part 3c may be formed in a straight line parallel to each other, or may be a concave part and a convex part having a polygonal cross section. Further, in the present embodiment, a plurality of engaging convex portions 2i and engaged convex portions 3c are provided, but one may be provided.

  In the present embodiment, the nut 2f is screwed into the connecting member side fitting portion 2c to restrict the movement in the axial direction between the connecting member 2 and the front housing 3. However, the present invention is limited to such a mode. Alternatively, the nut 2f may be welded to the connecting member side fitting portion 2c so as not to be relatively movable. Moreover, in this embodiment, it is good also as a double nut structure. Further, for example, the movement in the axial direction between the connecting member 2 and the front housing 3 may be restricted by a snap ring.

  In this embodiment, the ball bearing 5 that supports the inner shaft 7 is fixed to the inner periphery of the connecting member side fitting portion 2 c of the connecting member 2, but the bearing that supports the inner shaft 7 to the inner periphery of the front housing 3. May be fixed.

  In the present embodiment, the present invention is applied to the front housing 3 and the connecting member 2 made of different materials. However, the front housing 3 and the connecting member 2 may be applied to the same material.

(A) The schematic sectional drawing of a driving force transmission device, (b) The elements on larger scale of the same figure (a). The AA sectional view taken on the line of Fig.1 (a). The partial schematic sectional drawing of the driving force transmission apparatus of another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Driving force transmission apparatus, 2 ... Connection member, 2a ... Shaft part, 2c ... Connection member side fitting part, 2f ... Nut as a retaining part, 2g ... Outer peripheral surface, 2i, 31 ... As a connection member side engagement part 3... Front housing as the first rotating body, 3 a... Fitting portion, 3 c and 32 .. engaged protrusion as the engaging portion, 5... Ball bearing as the bearing, 7. Inner shaft as rotating body, 14 ... main clutch as connecting mechanism, C ... gap, S ... axial outer surface.

Claims (4)

A first rotating body formed in a cylindrical shape, a second rotating body that is coaxially arranged rotatably in a cylinder of the first rotating body, and disposed between the first rotating body and the second rotating body A driving force transmission device comprising: a coupling mechanism that couples the first rotating body and the second rotating body so as to transmit torque; and a coupling member that is coupled to the first rotating body so as not to be relatively rotatable. ,
The first rotating body includes, on one end side in the axial direction, an engaging portion that engages with the connecting member, and a fitting portion that is formed on the inner peripheral side of the engaging portion,
The connecting member includes a shaft portion to which driving force is input, a connecting member-side fitting portion that is fitted into the fitting portion, and an engagement of the first rotating body on the outer peripheral side of the connecting member-side fitting portion. A coupling member side engaging portion that engages with the joint portion in the circumferential direction,
The first rotating body and the connecting member are provided on the outer periphery of the connecting member-side fitting portion, and the movement in the axial direction is restricted by a retaining portion that engages with the fitting portion in the axial direction, so that relative rotation is impossible. And a driving force transmission device characterized by being coupled to. The driving force transmission device according to claim 1,
A driving force transmission device characterized in that an axial gap is provided between the connecting member and the first rotating body in a state where the connecting member and the first rotating body are connected. In the driving force transmission device according to any one of claims 1 and 2,
The second rotating body is rotatably supported by a bearing provided between the connecting member side fitting portion and the driving force transmitting device. In the driving force transmission device according to claim 3,
The connecting member side fitting portion is fitted into the fitting portion, and a nut is screwed onto the outer peripheral surface as the retaining portion.

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