JP2007309390A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device having improved assembling efficiency. <P>SOLUTION: A transfer 1 (the power transmission device) comprises: a casing 7 storing a hollow shaft 3 and an axle 5 (a pair of rotating members) connected to a front differential 207 (a differential mechanism); a housing body 11 (a first housing) storing a differential restricting mechanism 9 (a torque transmission mechanism) for restricting the differential motion of the front differential 207; and a cover housing 13 (a second housing) mounted on the housing body 11, the housing body 11 and the cover housing 13 being mounted on the casing 7. The housing body 11 has a supporting means 15 for supporting the differential restricting mechanism 9. The housing body 11 is unitized. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power transmission device having a plurality of housings.

As a conventional power transmission device, Patent Document 1 describes an axle module including a differential limiting mechanism (torque transmission mechanism) that limits the differential of a differential mechanism. In this axle module, a pressure plate (second housing) is attached to a housing (first housing) that houses a clutch pack that is a differential limiting mechanism, and the clutch pack in the housing is supported by the pressure plate. The housing and the pressure plate that accommodate the differential limiting mechanism are attached to a differential carrier (casing) that accommodates the differential mechanism.
JP 2003-287106 A

  However, in the axle module as described above, the differential limiting mechanism housed in the housing is supported by the pressure plate. Therefore, when removing the differential limiting mechanism from the differential device carrier, the housing and the pressure plate are combined together. Must be removed. Conversely, in the state before the housing and the pressure plate are attached to the differential carrier, the housing that accommodates the differential mechanism cannot be supported only by the housing that accommodates the differential restriction mechanism. A pressure plate must be attached. For this reason, since two housings of the housing (first housing) and the pressure plate (second housing) must be used for the assembly of the differential limiting mechanism, the weight increases and the number of parts increases. The number of man-hours increased and the assemblability decreased.

  Then, this invention aims at provision of the power transmission device which can improve assembly property.

  The invention according to claim 1 is a casing having at least a first housing and a second housing in which a pair of rotating members are accommodated and attached to each other, a torque transmission mechanism for transmitting torque between the pair of rotating members, and the first housing The first housing has a support means for supporting the torque transmission mechanism, and the first housing and the torque transmission mechanism are unitized. It is characterized by that.

  The invention according to claim 2 is the power transmission device according to claim 1, wherein the torque transmission mechanism includes a clutch mechanism and a cam mechanism for operating the clutch mechanism, and the cam mechanism is axially movable. And a pair of cam rings supported by the support means, wherein the support means supports the pair of cam rings.

  A third aspect of the present invention is the power transmission device according to the second aspect, wherein the first housing has a fixing member coupled to one of the pair of rotating members, and the support means includes the A snap ring provided on the fixing member and supporting the inner peripheral side of one of the cam rings, and a stepped portion supporting the inner peripheral side of the other cam ring.

  According to a fourth aspect of the present invention, in the power transmission device according to the second aspect, the support means includes a plate that supports one of the pair of cam rings, and the plate includes the plate of the first housing. The second housing is fixed to a side to which the second housing is attached.

  In the power transmission device according to the first aspect, since the torque transmission mechanism is supported by the first housing having support means and the first housing is unitized with the torque transmission mechanism, the first housing and the second housing are divided. It is possible to improve the assembling property.

  Further, since the first housing and the second housing can be divided, the torque transmission mechanism can be adjusted by removing only the first housing, the torque transmission mechanism can be easily handled, and the assembly workability can be improved. Can be improved.

  In the power transmission device according to the second aspect, since the first housing has the supporting means for supporting the cam ring, the torque transmission mechanism including the cam ring can be handled collectively, and the assembling property can be improved.

  In the power transmission device according to the third aspect, since the support means for supporting the cam ring of the fixing member of the first housing is the snap ring and the stepped portion, the cam ring can be reliably supported and the first torque transmission mechanism is accommodated. The housing can be unitized.

  In the power transmission device according to the fourth aspect, since the plate supporting the cam ring is fixed to the side of the first housing to which the second housing is attached, the cam ring can be supported with a simple configuration, and the torque transmission mechanism can be realized at low cost. Can be unitized.

  First, a power system of a vehicle to which the power transmission device of each embodiment is applied will be described with reference to FIG. Here, the transfer that is the power transmission device uses the transfer 1 of the first embodiment, but the same applies to the power system of the vehicle to which the transfer 101 of the second embodiment is applied.

  As shown in FIG. 1, the power system of the vehicle includes a horizontally installed engine 201 and transmission 203, a reduction gear set 205, a front differential 207, front axles 209 and 211, front wheels 213 and 215, and a transfer 1 ( Power transmission device), a rear wheel side propeller shaft 217, a coupling 219, a direction changing gear set 221, a rear differential 223, rear axles 225, 227, rear wheels 229, 231 and the like.

  The driving force of the engine 201 is transmitted from the transmission 203 to the front differential 207 via the reduction gear set 205 and the differential case 233, and is distributed from the front axles 209 and 211 to the front wheels 213 and 215, and from the differential case 233 to the transfer 1 and the rear It is transmitted to the coupling 219 via the wheel side propeller shaft 217, transmitted from the direction changing gear set 221 to which the coupling 219 is coupled to the rear differential 223, and distributed from the rear axles 225 and 227 to the rear wheels 229 and 231. To the four-wheel drive state. When the coupling 219 is released, the vehicle is in a two-wheel drive state with front wheel drive.

  The differential limitation of the front differential 207 is performed by the differential limiting mechanism 9 disposed on the transfer 1 side. Hereinafter, embodiments of the transfer will be described. In addition, the differential limiting mechanism used in each embodiment means the torque transmission mechanism of the present invention, and functions to perform torque transmission between two relative rotating members.

(First embodiment)
The first embodiment will be described with reference to FIG.

  The transfer 1 according to this embodiment includes a casing 7, which has three members of a first housing 11, a second housing 13, and a third housing 8, and is connected to a front differential 207 (differential mechanism). A gear housing 8 (third housing) in which the hollow shaft 3 and the axle 5 (a pair of rotating members) are accommodated, and a differential limiting mechanism 9 (torque transmission mechanism) for limiting the differential between the front differential 207 are accommodated. A housing body 11 (first housing) and a cover housing 13 (second housing) attached to the housing body 11, and the housing body 11 and the cover housing 13 are attached to the casing 7. The housing body 11 has support means 15 for supporting the differential limiting mechanism 9 and the housing body 11 is unitized.

  The differential limiting mechanism 9 includes a clutch mechanism 17 and a cam mechanism 19 that operates the clutch mechanism 17. The cam mechanism 19 includes a pair of annular cam rings 21 and 23 that are supported so as to be movable in the axial direction. The support means 15 supports the pair of cam rings 21 and 23, and the housing body 11 has a hub 25 (fixing member) connected to the hollow shaft 3 (one of the pair of rotating members). The means 15 includes a snap ring 27 provided on the hub 25 and supporting the inner peripheral side of the cam ring 21, and a step portion 29 supporting the inner peripheral side of the cam ring 23.

  As shown in FIG. 2, the casing 7 accommodates the hollow shaft 3 and the axle 5. The casing 7 is provided with a bearing 31 and supports the hollow shaft 3 rotatably. The hollow shaft 3 is splined to the differential case 233 of the front differential 207 at the spline portion 33 and is rotated integrally with the differential case 233. A ring gear 35 is fixed to the hollow shaft 3 with a bolt 37 and meshes with the gear 235 of the rear wheel side propeller shaft 217 to transmit a driving force to the rear wheel side propeller shaft 217 side. Further, an axle 5 is inserted through the inner periphery of the hollow shaft 3. The axle 5 is connected to the side gear 237 of the front differential 207, is rotated integrally with the side gear 237, and transmits driving force to the front axle 211 side. A cover housing 13 is attached to the casing 7.

  The cover housing 13 is provided with a bearing 39 and rotatably supports the hollow shaft 3. Further, a contact portion 41 that receives the cam thrust force of the cam ring 21 of the cam mechanism 19 that is the differential limiting mechanism 9 is formed on the inner peripheral side of the cover housing 13. A housing body 11 is attached to the cover housing 13, and the casing 7, the cover housing 13, and the housing body 11 are fixed by bolts 42.

  The housing body 11 has a hub 25 that supports the cam rings 21 and 23 of the cam mechanism 19 that is the differential limiting mechanism 9. The hub 25 is formed with spline portions 43 and 45. The spline portion 43 is spline-connected to the hollow shaft 3, and the hub 25 is rotated integrally with the hollow shaft 3. The spline portion 45 is spline-coupled with the clutch hub 47 of the clutch mechanism 17 so that the hub 25 and the clutch hub 47 are rotated together. Further, the hub 25 is provided with support means 15. The support means 15 includes a snap ring 27 and a step portion 29. The snap ring 27 is fixed to the outer periphery of the hub 25 and supports the cam ring 21 in the axial direction. The stepped portion 29 is formed on the outer periphery of the hub 25 and supports the cam ring 23 in the axial direction. A differential limiting mechanism 9 is accommodated in the housing body 11.

  The differential limiting mechanism 9 includes an actuator 49, a cam mechanism 19, and a clutch mechanism 17. The actuator 49 includes a reversible electric motor 51 and reduction gear sets 53 and 55. As shown in FIG. 3, the electric motor 51 is disposed on the rear side with respect to the axle 5 within the projection surface in the vehicle width direction of the housing body 11 outside the housing body 11. In the casing 7, the gear 235 of the rear wheel side propeller shaft 217 is disposed on the rear side with respect to the axle 5. For this reason, the weight of the entire transfer 1 is larger on the rear side with respect to the axle 5. Thereby, a heavy member is not divided into the front side and the rear side with respect to the axle 5, and the shake of the entire transfer 1 due to the rotation of the axle 5 can be suppressed. The electric motor 51 has an output shaft 57 and transmits the rotation to the reduction gear set 53.

  The reduction gear set 53 includes a small diameter gear 59 and a large diameter gear 61. The small diameter gear 59 is formed on the outer periphery of the output shaft 57 of the electric motor 51 and meshes with the large diameter gear 61. The large diameter gear 61 is formed on the outer periphery of the large diameter portion of the rotating shaft 63. The rotating shaft 63 is rotatably supported by a pin 67 supported by a through hole 65 formed in the housing body 11. The reduction gear set 55 includes a small diameter gear 69 and a large diameter gear 71. The small diameter gear 69 is formed on the outer periphery of the small diameter portion of the rotating shaft 63 and meshes with the large diameter gear 71. The large-diameter gear 71 is formed on the outer periphery of the cam ring 23 of the cam mechanism 19 and causes the cam mechanism 19 to generate a cam thrust force.

  The cam mechanism 19 includes a pair of annular cam rings 21 and 23, cam balls (not shown), and a pressure plate 73. The cam rings 21 and 23 are supported on the outer periphery of the hub 25 so as to be movable in the axial direction, and the maximum width of the axial movement is restricted by the snap ring 27 and the step portion 29. The cam ball is disposed between the cam rings 21 and 23 and causes the cam rings 21 and 23 to be differentially rotated by the electric motor 51 and the reduction gear sets 53 and 55 to move the cam rings 21 and 23 in the axial direction.

  The thrust force of the cam ring 21 is received by the contact portion 41 of the cover housing 13, and the thrust force of the cam ring 23 is received by the bearing 75.

  Further, the bearing 75 blocks the rotation on the cam ring 23 side and the rotation on the pressure plate 73 side. The pressure plate 73 is supported on the inner periphery of the cam ring 23 so as to be movable in the axial direction. A return spring 77 is provided between the pressure plate 73 and the clutch hub 47, and presses the pressure plate 73 in the direction in which the multi-plate clutch 79 of the clutch mechanism 17 is released. An oil groove 81 is spirally formed on the outer periphery of the pressure plate 73. The oil groove 81 functions as an oil pump by the rotation of the pressure plate 73 and lubricates the sliding portion. When the cam ring 23 is moved in the fastening direction of the multi-plate clutch 79 by the cam thrust force, the cam ring 23 presses the pressure plate 73, and the pressure plate 73 presses the multi-plate clutch 79 to fasten the multi-plate clutch 79.

  The clutch mechanism 17 includes a clutch hub 47, a clutch housing 83, and a multi-plate clutch 79. The clutch hub 47 is splined to the hub 25 and is rotated integrally with the differential case 233 of the front differential 207. The clutch housing 83 is spline-connected to the axle 5 by a spline portion 85 and is rotatably supported by a bearing 87. For this reason, the clutch housing 83 is rotated integrally with the side gear 237 of the front differential 207. The multi-plate clutch 79 includes a plurality of outer clutch plates 89 and a plurality of inner clutch plates 91. The outer clutch plate 89 is splined to the inner periphery of the clutch housing 83. The inner clutch plate 91 is splined to the outer periphery of the clutch hub 47. When the multi-plate clutch 79 is engaged, the clutch hub 47 and the clutch housing 83 are connected, that is, the differential case 233 and the side gear 237 of the front differential 207 (see FIG. 1) are connected. Movement is restricted.

  In the transfer 1 configured as described above, when the electric motor 51 is operated, the rotation is reduced by the reduction gear sets 53 and 55 and the cam ring 23 is rotated. Due to the rotation of the cam ring 23, a cam thrust force is generated in the cam mechanism 19, and the pressure plate 73 is moved in the fastening direction of the multi-plate clutch 79. By the movement of the pressure plate 73, the multi-plate clutch 79 is engaged, and the differential at the front differential 207 is limited.

  Further, in the transfer 1, the housing body 11 has the support means 15 for supporting the differential limiting mechanism 9, so that the differential limiting mechanism 9 can be removed by removing only the housing body 11 from the casing 7 and the cover housing 13. Can do. Specifically, when the housing body 11 is moved to the right in the drawing and removed, the snap ring 27 and the cam ring 21 come into contact with each other, so that the cam ring 21 does not fall off the housing body 11 and the entire differential limiting mechanism 9 is removed. Can be removed. For this reason, the clutch plate of the multi-plate clutch 79 is increased or decreased, adjustment of the clutch mechanism 17 such as replacement of the clutch plate, adjustment of the cam thrust force of the cam mechanism 19, adjustment of the cam mechanism 19 such as replacement of the cam rings 21 and 23. In addition, adjustment of the entire differential limiting mechanism 9 such as adjustment of the actuator 49 is facilitated. Then, after adjustment of the differential limiting mechanism 9, only the housing body 11 may be assembled.

  In such a transfer 1, since the differential limiting mechanism 9 is supported by the housing body 11 having the support means 15 and the housing body 11 is unitized with the differential limiting mechanism 9, the housing body 11, the cover housing 13, Can be divided, and the assemblability can be improved.

  Moreover, since the housing main body 11 and the cover housing 13 can be divided | segmented, the differential limiting mechanism 9 can be removed only by removing only the housing main body 11, and adjustment of the differential limiting mechanism 9 etc. are easy to perform. For this reason, the differential limiting mechanism 9 can be easily handled, and the assembly workability can be improved.

  Further, since the housing main body 11 has the support means 15 for supporting the cam rings 21 and 23, the cam rings 21 and 23 that are likely to vary during removal can be handled together with the clutch mechanism 17 and the actuator 49, thereby improving the assembling property. Can do.

  Further, since the support means 15 for supporting the cam rings 21 and 23 of the hub 25 of the housing body 11 is the snap ring 27 and the step portion 29, the cam rings 21 and 23 can be reliably supported, and the differential limiting mechanism 9 can be The housing main body 11 accommodated can be unitized. In other words, the differential limiting mechanism 9 as a torque transmission mechanism can be assembled and supported (that is, sub-assembled) with respect to the housing body 11 that is one housing member.

(Second Embodiment)
A second embodiment will be described with reference to FIG.

  In the transfer 101 of the present embodiment, the support means 103 has a plate 105 that supports the cam ring 21, and the plate 105 is fixed to the side of the housing body 11 to which the cover housing 13 is attached. In addition, although the same code | symbol is attached | subjected to the structure same as 1st Embodiment, description is abbreviate | omitted, Since it is the same structure as 1st Embodiment, the effect obtained is equivalent to 1st Embodiment.

  As shown in FIG. 3, the support means 103 includes a plurality of plates 105 that are fixed to the housing body 11. The plate 105 is fixed by a fixing means such as a rivet by crimping a fixing portion 107 formed on the side of the housing body 11 on the side where the cover housing 13 is attached. Further, the plate 105 supports the cam ring 21 in the axial direction by contacting the cam ring 21 on the radially inner side. When the housing body 11 is moved to the right in the figure by the plate 105 and removed, the plate 105 and the cam ring 21 come into contact with each other, so that the cam ring 21 does not fall off the housing body 11 and the entire differential limiting mechanism 9 is removed. Can be removed. Although a plurality of plates 105 are provided, a single ring shape in the circumferential direction may be used.

  In such a transfer 101, since the plate 105 that supports the cam ring 21 is fixed to the side of the housing body 11 on which the cover housing 13 is attached, the cam ring 21 can be supported with a simple configuration, and the differential can be realized at low cost. The housing main body 11 that accommodates the limiting mechanism 9 can be unitized.

It is the schematic of the power system of the vehicle of each embodiment. It is sectional drawing of the transfer of 1st Embodiment. It is a side view of the transfer of a 1st embodiment. It is sectional drawing of the transfer of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 ... Transfer 3 ... Hollow shaft 5 ... Axle 7 ... Casing 8 ... Gear housing 9 ... Differential limiting mechanism 11 ... Housing main body 13 ... Cover housing 15,103 ... Support means 17 ... Clutch mechanism 19 ... Cam mechanism 21,23 ... Cam ring 25 ... Hub 27 ... Snap ring 29 ... Step part 47 ... Clutch hub 49 ... Actuator 51 ... Electric motor 73 ... Pressure plate 79 ... Multi-plate clutch 83 ... Clutch housing 105 ... Plate 107 ... Fixed part 201 ... Engine 203 ... Transmission 207 ... Front differential 233 ... Differential case 237 ... Side gear

Claims (4)

A casing having at least a first housing and a second housing in which a pair of rotating members are housed and attached to each other; a torque transmission mechanism for transmitting torque between the pair of rotating members; and a clutch mechanism housed in the first housing; A power transmission device comprising:
The first housing has support means for supporting the torque transmission mechanism, and the first housing and the torque transmission mechanism are unitized. The power transmission device according to claim 1,
The torque transmission mechanism includes a clutch mechanism and a cam mechanism that operates the clutch mechanism. The cam mechanism includes a pair of cam rings that are supported so as to be axially movable, and the support means includes the pair of cam rings. A power transmission device that supports a cam ring. The power transmission device according to claim 2,
The first housing has a fixing member connected to one of the pair of rotating members, and the support means is provided on the fixing member and supports an inner peripheral side of one of the cam rings. A power transmission device comprising: a snap ring; and a step portion that supports an inner peripheral side of the other cam ring. The power transmission device according to claim 2,
The support means includes a plate that supports one of the pair of cam rings, and the plate is fixed to a side of the first housing to which the second housing is attached. apparatus.

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