JP4892430B2 - Driving force transmission device, assembling method of driving force transmission device, and jig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving force transmission device for eliminating the need for shim driving work. <P>SOLUTION: A distribution case 9 consists of a combination of case body 69 and case cover 69 joined abutting onto each other via a joint face 67 along a plane including the axial centers of bearing mounting hole portions 91, 93. The inner periphery diameters of shims 123a, 125a, 125b are set smaller than seal supporting hole portions 97, 99, 101 ranging from end openings 102, 104 of the distribution case 9, respectively. The seal supporting hole portions 97, 99, 101 ranging from the end openings 102, 104 of the distribution case 9 are shaped to allow the internal embracement of outer cylinder portions 161, 165 of a tool 145 ranging from the end openings 102, 104 over the outside of the distribution case 9 while abutting on the shims 123a, 125a and to allow the axial pull-off of the outer cylinder portions 161, 165 of the tool 145 from the end openings 102, 104 to the outside. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

The present invention relates to a driving force transmission device, an assembling method of a driving force transmission device, and a jig used for a transfer, a rear differential device, and the like.

  As a conventional driving force transmission device, as shown in FIG. 6 of Patent Document 1, driving force transmission is performed between a drive pinion gear of a drive pinion shaft and a ring gear of a rear differential device. There is something.

  In this driving force transmission device, the drive pinion shaft and the differential case of the rear differential device are rotatably supported on the carrier case by bearings. A shim is incorporated between the bearing supporting the differential case and the carrier case in the axial direction, and axial preload is applied to the rotational support of the differential case.

  The carrier case includes a cover on the side of the rotation shaft of the rear differential device, and the rear differential device and the like can be assembled to the carrier case from a direction along the rotation axis.

  In such assembly, the shim can be assembled from the direction along the rotational axis of the rear differential device.

  However, the carrier case does not have a cover on the side of the rotating shaft of the rear differential device, and is divided into a carrier case main body and a carrier case cover at a joint surface along the rotating shaft center of the rear differential device. In this case, there is a difficulty in assembling the shim and the seal member.

  More specifically, in the structure as disclosed in Patent Document 1, the carrier case does not include a cover on the side of the rotating shaft of the rear differential device, and the carrier case is connected at the connecting surface along the rotating shaft center of the rear differential device. When divided into a case body and a carrier case cover, the assembling is performed as follows.

  First, a rear differential device is incorporated into a carrier case main body through a bearing by translation of the shaft center. Thereafter, a shim is driven into the divided portion of the bearing mounting hole portion from the inner diameter side to apply pressure. The carrier case cover is then coupled to the carrier case body by abutment at the coupling surface.

  However, skill is required for the shim driving operation, and the carrier case body and the like may be damaged by the shim during driving.

JP 2007-71306 A

  The problem to be solved is that the pressurizing operation of the pressurizing member requires skill, and the pressurizing member may damage the carrier case body and the like at the time of driving.

The present invention eliminates the need for driving the pressurizing member, and includes a case in which a bearing mounting hole is formed on the back side of the inner peripheral surface continuous to the end opening, and a bearing mounting shaft in the bearing mounting hole. A driving force provided with a rotating body that is rotatably supported via a bearing, and a pressure applying member that is provided between the bearing mounting hole and the bearing in the axial direction to apply an axial pressure. The transmission device, wherein the case is a combination of first and second divided case portions that are abutted and coupled by a coupling surface along a plane including the shaft center of the bearing mounting hole, The inner peripheral diameter of the member is set smaller than the inner peripheral surface continuous with the end opening of the case, and the shape of the inner peripheral surface continuous with the end opening of the case is in contact with the pressurizing member. It is possible to enclose a revolving shape portion of a jig extending from the end opening to the outside of the case, and the front Portion of the orbiting shape of jig ends formed to be pulling in the axial direction from the opening to the outside, the rotating member, the driving force transmission device that is a rotation shaft coupled to wheel output side after the differential gear Features.

A case in which a bearing mounting hole is formed on the back side of the inner peripheral surface continuous to the end opening, and a rotating body in which a bearing mounting shaft is rotatably supported via a bearing in the bearing mounting hole; A pressurizing member provided between the bearing mounting hole portion and the bearing in the axial direction to apply an axial pressure, and the case extends along a surface including the axis of the bearing mounting hole portion. The inner peripheral diameter of the pressurizing member is set smaller than the inner peripheral surface continuous to the end opening of the case. The shape of the inner peripheral surface continuous to the end opening of the case can be included in a circular shape portion of a jig that extends from the end opening to the outside of the case while contacting the pressurizing member. The circular shape part of the jig was formed so that it could be pulled out from the end opening in the axial direction. A method of assembling the driving force transmission device for assembling a power transmission device, the bearing mounted on the bearing mounting shaft portion prior to assembling the rotating body in the case, the assembly position of the pressurization applying member relative to the bearing The rotating body is placed in a temporary pressurizing state by contacting the pressurizing member with the circular portion of the jig and holding it in the axial direction. The bearing is assembled to one of the first and second divided case portions so that the bearing is attached to the divided portion of the bearing mounting hole, and then the other of the first and second divided case portions is attached to the first and second divided case portions. The jig is coupled to one of the first and second divided case portions by the coupling surface, and the circumferential portion of the jig is included in the inner circumferential surface continuous to the end opening of the case, and then the jig is sandwiched. To cancel That withdrawn from the end opening of the serial case a portion of the circumferential shape of the jig in the axial direction, characterized the assembly method of the driving force transmission device.

  Furthermore, the most important feature of the jig is that the jig includes a contact movable portion provided with the circumferentially shaped distal end side portion and a member that clamps and moves the contact movable portion in the axial direction.

According to the present invention, a case in which a bearing mounting hole is formed on the inner side of the inner peripheral surface continuous to the end opening, and a bearing mounting shaft is rotatably supported by the bearing mounting hole through the bearing. A driving force transmission device comprising: a rotating body; and a pressurizing member provided between the bearing mounting hole portion and the bearing in the axial direction to apply an axial pressure. A combination of first and second divided case portions that are abutted and coupled by a coupling surface along a surface including the axis of the bearing mounting hole portion, and the inner peripheral diameter of the pressurizing member is set to the end of the case A jig that is set smaller than the inner peripheral surface that is continuous with the opening of the portion, and that the shape of the inner peripheral surface that is continuous with the end opening of the case extends from the end opening to the outside of the case while being in contact with the pressurizing member Can be included, and the circular portion of the jig can be removed from the end opening. Extractable in form in the axial direction to the rotary body is a rotary shaft coupled to wheel output side after the differential unit.

  For this reason, before assembling the rotating body to the case, the bearing is attached to the bearing mounting shaft portion, the pressurizing member is disposed at an assembling position with respect to the bearing, and the pressurizing member is attached to the pressurizing member. A provisional pressure application state can be obtained by bringing the circular-shaped portion into contact with each other and holding the portion in the axial direction. And, assembling the rotating body together with the bearing, the pressurizing member and the jig so that the bearing is attached to one of the first and second divided case parts to the divided part of the bearing mounting hole part, Thereafter, the other of the first and second divided case portions is coupled to one of the first and second divided case portions by the coupling surface, and the circular portion of the jig is used as an end opening of the case. It can be included in a continuous inner peripheral surface, and thereafter, the clamping of the jig can be released, and the circumferential portion of the jig can be pulled out in the axial direction from the end opening of the case.

  Therefore, even when the case is not provided with a cover on the side in the axial direction of the rotating body, the case can be incorporated without the need to drive the pressurizing member, and the pressurizing member can damage the carrier case body and the like. Absent.

Further, according to the method for assembling the driving force transmission device, a case in which a bearing mounting hole is formed on the back side of the inner peripheral surface continuous to the end opening, and a bearing mounting shaft portion is interposed in the bearing mounting hole through the bearing. A rotating body that is rotatably supported, and a pressurizing member that is interposed between the bearing mounting hole portion and the bearing in an axial direction to apply an axial pressure, and the case includes the bearing. It is a combination of first and second divided case parts that are abutted and joined by a joining surface along the surface including the axis of the mounting hole, and the inner peripheral diameter of the pressurizing member is set to the end of the case. The jig is set smaller than the inner peripheral surface continuous to the opening, and the shape of the inner peripheral surface continuous to the end opening of the case is made to be outside the case from the end opening while contacting the pressurizing member. The loop-shaped part can be included, and the loop-shaped part of the jig is removed from the end opening. To a method of assembling the driving force transmission device for assembling a driving force transmitting apparatus can form pulling in the axial direction, mounting the bearing to the bearing mounting shaft portion prior to assembling the rotating body in the case, the bearing On the other hand, the pressurizing member is arranged at the assembly position, and the rotating member is brought into a temporary pressurizing state by bringing the circumferential portion of the jig into contact with the pressurizing member and holding it in the axial direction. Along with the bearing, the pressure applying member, and the jig, the bearing is attached to one of the first and second divided case portions so that the bearing is attached to the divided portion of the bearing mounting hole, and then the first, An inner peripheral surface in which the other of the second divided case portions is coupled to one of the first and second divided case portions by the coupling surface, and the circular-shaped portion of the jig is continuous with the end opening of the case. Included in By then pulling the after releasing the clamping jig end opening of the case a portion of the circulating form of the jig in the axial direction, it is possible to perform the assembly of the pressurized application member.

  Further, the pressurizing member is assembled by a jig including a contact movable part provided with the circumferentially shaped front end side part and a member for nipping and moving the contact movable part in the axial direction. Can do.

  The object of eliminating the need to drive the pressurizing member is realized by a structure that allows the use of a jig that clamps the pressurizing member between the circular portions.

[Overall configuration of four-wheel drive vehicle]
FIG. 1 is a skeleton plan view of a four-wheel drive vehicle.

  As shown in FIG. 1, the transfer 1 that is the driving force transmission device of the present embodiment is disposed on the outer periphery of the intermediate shaft 3 on the front wheel side, and is coupled to the rear wheel output side of the front differential device 5. As a case, the distribution case 9 of the transfer 1 is attached to a bell housing 13 on the transmission 11 side.

  A front differential device 5 is supported in the bell housing 13. The front differential device 5 receives drive input from the engine 15 via the transmission 11. This drive input is made to the differential case 19 via the ring gear 17.

  Intermediate shafts 21 and 3 are coupled to the left and right side gears, which are output portions of the front differential device 5, respectively. The intermediate shafts 21 and 3 are coupled to left and right front wheel axles 23 and 25, which are axles, to connect the front differential device 5 and the front wheel axles 23 and 25. The front wheel axles 23 and 25 are interlocked to the left and right front wheels 29 and 31.

  Therefore, the driving force output of the front differential device 5 is transmitted to the left and right front wheels 29 and 31 via the front wheel axles 23 and 25 by the intermediate shafts 21 and 3.

  The transfer 1 distributes the drive input to the front differential device 5 to the rear wheel side. The intermediate shaft 3 is disposed through the distribution case 9 of the transfer 1.

  In the distribution case 9, a connecting hollow shaft 33 as an input shaft (rotating body) is provided. The connecting hollow shaft 33 is loosely fitted on the outer periphery of the intermediate shaft 3. One end of the connecting hollow shaft 33 is linked to the differential case 19 of the front differential device 5. A ring gear 35 is attached to the connecting hollow shaft 33, and the ring gear 35 meshes with a pinion gear 39 of a rear wheel side output shaft 37 as an output shaft. The ring gear 35 and the pinion gear 39 are formed of bevel gears. The ring gear 35 and the pinion gear 39 are orthogonally meshed to form an orthogonal gear set 41.

  A propeller shaft 45 is coupled to the rear wheel side output shaft 37 via a universal joint 43. A drive pinion shaft 49 is coupled to the propeller shaft 45 via an on-demand torque transmission coupling 48 for a universal joint 47, 4WD. The drive pinion gear 51 of the drive pinion shaft 49 meshes with the ring gear 55 of the rear differential device 53.

  The rear differential device 53 is supported by a carrier case 57 as a case. Left and right rear wheels 63 and 65 are linked to the rear differential device 53 via left and right rear wheel axles 59 and 61.

  Accordingly, when torque is input from the engine 15 to the ring gear 17 of the front differential device 5 via the transmission 11, on the one hand, the left and right front wheels 29, 31 via the intermediate shafts 21, 3 and the front wheel axles 23, 25 are provided. Torque is transmitted to On the other hand, torque is transmitted to the rear wheel output shaft 37 via the differential case 19, the connecting hollow shaft 33, the ring gear 35, and the pinion gear 39.

  From the rear wheel side output shaft 37, a rear differential is connected via a universal joint 43, a propeller shaft 45, a universal joint 47, a torque transmission coupling 48, a drive pinion shaft 49, and a drive pinion gear 51. Torque is transmitted to the ring gear 55 of the device 53. Torque is transmitted from the rear differential unit 53 to the left and right rear wheels 63 and 65 via the left and right rear wheel axles 59 and 61.

By this torque transmission, the front and rear wheels 29, 31, 63, and 65 can travel in a four-wheel drive state.
[transfer]
FIG. 2 is a plan sectional view of the transfer.

  The transfer 1 in FIG. 2 is provided on the rear wheel output side of the front differential device 5 as described above, and the drive input to the front differential device 5 (FIG. 1) is directed to the rear wheels 63 and 65 (FIG. 1) side. To distribute. In this transfer 1, a connecting hollow shaft 33 and a rear wheel side output shaft 37 that are arranged so as to cross an input / output shaft in a distribution case 9 as a case and transmit driving force are rotatably supported.

  FIG. 3 is a schematic view in the direction of arrow III in FIG.

  As shown in FIGS. 2 and 3, the distribution case 9 includes a case main body 69 which is a first divided case portion and a second divided case portion by a coupling surface 67 along the rotation axis of the ring gear 35. The case main body 69 and the case cover 71 are joined to each other by a bolt 73 with the joining surface 67 being aligned. In this embodiment, the upper side of the coupling surface 67 is formed to be inclined with respect to the vertical direction so as to incline backward toward the tip end side of the pinion gear 39 (rear wheel side output shaft 37).

  With such a configuration, the distribution case 9 as a case has a coupling surface 67 along a plane including the shaft center (a shaft center of a bearing mounting hole described later) with the connecting hollow shaft 33 as one of the input / output shafts as a rotating body. The structure includes a case body 69 and a case cover 71 as first and second divided case portions that can be abutted and joined.

  The case main body 69 and the case cover 71 of the distribution case 9 are coupled by the bolts 73 as described above, but a plurality of shafts 75 are provided on both sides of the shaft center 75 so as to avoid interference with the ring gear 35 and the connecting hollow shaft 33. Bolts 73 are arranged to provide a sufficient coupling force. The axial center of the bolt 73 is arranged toward the case main body 69 in a direction crossing the axial center of the ring gear 35. Thereby, it is suppressed that the head part of the volt | bolt 73 protrudes toward the outer diameter side from the cylindrical part of the case cover 71, and the space | gap engagement with other members (engine etc.) can be suppressed. In other words, the head of the bolt 73 is disposed closer to the inside of the outer case of the case cover 71, and the protrusion to the outside of the outer case is suppressed.

  On the end side of the case main body 69 in the direction along the rotational axis of the ring gear 35, a flange portion 77 is provided, and bolt insertion portions 79, 81, 83, 85 are provided.

  The distribution case 9 is attached to the wall surface of the bell housing 13 on the transmission side with bolts inserted into the bolt insertion portions 79, 81, 83, 85 and the like of the case body 69. The case cover 71 has a gap with respect to the wall surface of the bell housing 13, so that the distribution case 9 can be securely attached to the bell housing 13.

  Further, the bolt insertion portions 79 and 85 in the flange portion 77 are located so as to protrude from the coupling surface 67 including the shaft center 75 of the ring gear 35 to the case cover 71 side. Can be suppressed.

  A third divided case portion 89 is coupled to the case main body 69 by a bolt 87. A through hole 90 for an oil passage is formed in the third divided case portion 89 and an O-ring 92 is supported. The O-ring 92 is in close contact with the case body 69.

  The case main body 69 and the case cover 71 of the distribution case 9 are provided with bearing mounting holes 91 and 93 as support parts for the ring gear 35. The outer end portions in the axial direction of the bearing mounting holes 91 and 93 are formed in a stepped shape.

  The case main body 69 and the case cover 71 are provided with a receiving portion 95 for the ring gear 35. The distribution case 9 is provided with seal support holes 97, 99, and 101.

  The seal support hole portions 97 and 101 are formed on the inner peripheral surface continuing to the end openings 102 and 104, and the seal support hole portion 99 is formed to have a slightly smaller diameter than the seal support hole portion 101. , 101 are formed continuously.

  Therefore, the bearing mounting hole portions 91 and 93 are formed on the back side of the seal support hole portions 97 and 101 (99), which are the inner peripheral surfaces continuous to the end openings 102 and 104.

  The case main body 69 includes a portion 103 positioned at the lowest position in the gravity direction, and constitutes a main part of an oil reservoir for oil sealed inside the power transmission device 1. The case body 69 includes an opening 105. A filler plug 107 is attached to the opening 105 and can be opened and closed in order to enclose oil therein.

  By providing an opening 105 on the case body 69 side and assembling accessory parts such as a filler plug 107 and a drain plug (not shown), the case cover 71 has a simple shape mainly considering strength. Thus, the space between the case cover 71 and other members (such as an engine) can be suppressed, and the degree of freedom in design can be further improved.

  In the case main body 69 of the distribution case 9, the connecting hollow shaft 33 is connected to the boss portion of the differential case 19 of the front differential device 5 by the spline portion 109 as described above.

A spline portion 109 for coupling is provided on the outer periphery on one end side of the connecting hollow shaft 33, and a bearing mounting shaft portion 111 facing the inner peripheral side of the bearing mounting hole portion 91 is provided. On the outer end side of the bearing mounting shaft portion 111, a seal support shaft portion 122 disposed concentrically in the seal support hole portion 97 is provided.

  On the other end side of the connecting hollow shaft 33, a bearing mounting shaft portion 113 is provided so as to face the inner peripheral side of the bearing mounting hole 93. On the outer end side of the bearing mounting shaft portion 113, a seal support shaft portion 114 is provided concentrically facing the seal support hole portion 99 so as to be opposed to the inside and outside.

  A flange portion 115 is provided at an intermediate portion of the connecting hollow shaft 33. The ring gear 35 is fastened and fixed to the flange portion 115 by bolts 117.

  The connecting hollow shaft 33 is rotatably supported in bearing mounting holes 91 and 93 of the case main body 69 and the case cover 71 by tapered roller bearings 119 and 121 which are bearings.

  4 and 5 are enlarged cross-sectional views of the main part showing the relationship between the tapered roller bearing and the shim together with a part of the jig.

  As shown in FIGS. 2 to 5, the axial distance between the outer races 119 a and 121 a of the tapered roller bearings 119 and 121 and the axial end surfaces of the bearing mounting holes 91 and 93 of the case body 69 and the case cover 71. In addition, shims 123a, 123b, 125a, and 125b are interposed as pressurizing members that apply axial pressure. A washer 126 is further interposed between the outer race 121a of the tapered roller bearing 121 and the shim 125b.

  The inner peripheral diameter of the shim 123 a is set smaller than the inner diameter of the inner peripheral surface of the seal support hole 97, and protrudes to the inner diameter side of the inner peripheral surface of the seal support hole 97.

  The inner diameters of the shims 125 a and 125 b are set smaller than the inner diameter of the inner peripheral surface of the seal support hole 99, and protrude toward the inner diameter side from the inner peripheral surface of the seal support hole 99.

  Therefore, the shape of the seal support hole 97 and the seal support holes 99 and 101 which are inner peripheral surfaces continuous to the end openings 102 and 104 of the distribution case 9 is set in contact with the shims 123a and 125a. It is possible to enclose a circular shape portion of a jig, which will be described later, from the openings 102, 104 to the outside of the distribution case 9, and to rotate the circular shape portion of the jig from the end openings 102, 104 to the outside as described later in the axial direction The structure is formed so that it can be pulled out.

Seal members 127 and 129 are interposed between the seal support hole portions 97 and 99 and the seal support shaft portions 122 and 114, and the outer peripheral surfaces of the seal members 127 and 129 are fitted to the inner peripheral surfaces of the seal support holes 97 and 99. Match.

  A seal member 131 is interposed between the intermediate shaft 3 penetrating the shaft center portion of the connection hollow shaft 33 and the seal support shaft portion 114. A seal member and a dust cover (not shown) are interposed between the intermediate shaft 3 and the seal support hole 101.

  The rear wheel side output shaft 37 is supported by the third case portion 89 of the distribution case 9 by the tapered roller bearings 133 and 135, and the pinion gear 39 is supported by the third case portion 89. It has become.

  A coupling flange member 137 is fastened to the rear wheel side output shaft 37 by a nut 139. A seal member 141 is provided between the distal end portion of the coupling flange member 137 and the third case portion 89 of the distribution case 9.

  Accordingly, the distribution case 9 can be partitioned by the seal members 92, 127, 129, and 141 to form an oil-completed structure, and the lubricating oil is sealed in the accommodation space 142.

A dust cover 143 supported by the coupling flange member 137 is disposed outside the seal member 141.
[Assembly of jig and transfer]
6A and 6B show a method for assembling the transfer 1 together with a jig. FIG. 6A is a cross-sectional view in which a tapered roller bearing and a shim are arranged on a connecting hollow shaft, and FIG. Sectional drawing which shows the state which provides a pressurization, (c) is sectional drawing of the state which assembled | attached the connection hollow shaft to the distribution case 9 with the taper roller bearing, the shim, and the jig | tool.

  As shown in FIG. 6B, the jig 145 is a screw shaft as a male and female screw member that is an example of a member that generates an axial force so as to sandwich the pair of contact movable portions 147 and 149 and these contact members. 151 and nuts 153 and 155.

  The abutting movable parts 147 and 149 are composed of circular wall parts 157 and 159 and outer and inner cylindrical parts 161, 163, 165 and 167.

  The circumferential wall portions 157 and 159 and the outer cylindrical portions 161 and 165 are integrally coupled, and the outer cylindrical portions 161 and 165 include circular-shaped distal end side portions 161a and 165a, and the distal end portions 161a and 165a have The contact portions 169 and 171 are formed in a stepped shape. The surface 169a where the contact portion 169 faces the shim 123a and the surface 171a where the contact portion 171 faces the shims 125a and 125b are formed in a round shape.

  The circumferential wall portions 157 and 159 and the inner cylinder portions 163 and 167 are integrally formed and are movably fitted to the screw shaft 151. Fitting heads 173 and 175 are formed on the inner cylinder portions 163 and 167, and are configured to be fitted and guided in the shaft holes 177 and 179 of the connecting hollow shaft 33.

  Washers 181 and 183 are interposed between the nuts 153 and 155 and the circumferential wall portions 157 and 159.

  When the transfer 1 is assembled, before the coupling hollow shaft 33 is assembled to the distribution case 9, the tapered roller bearings 119, 121 are attached to the bearing mounting shaft portions 111, 113 as shown in FIG. The shims 123a and 123b, the shims 125a and 125b, and the washer 126 are arranged at the assembly position with respect to the roller bearings 119 and 121.

  Next, as shown in FIG. 6B, a jig 145 is attached to the connecting hollow shaft 33 in which the tapered roller bearings 119, 121 and the shims 123a, 123b, 125a, 125b are arranged as described above.

  The screw shaft 151 of the jig 145 is passed through the shaft center of the connecting hollow shaft 33, and the contact movable portions 147 and 149 are inserted and fitted from the respective end portions of the screw shaft 151, so that the outer cylinder portions 161 and 165 are in contact with each other. The parts 169 and 171 are abutted against the shims 123a and 125a.

  At this time, the inner peripheral sides of the shims 123 a and 125 a are supported by the contact portions 169 and 171. In this state, the fitting heads 173 and 175 of the inner cylinder parts 163 and 167 are fitted in the shaft holes 177 and 179 of the connecting hollow shaft 33, and the fluctuation of the contact movable parts 147 and 149 with respect to the connecting hollow shaft 33 is restricted. Is done.

  Next, nuts 153 and 155 are screwed from the respective end portions of the screw shaft 151 through washers 181 and 183, and the contact movable portions 147 and 149 are tightened in the axial direction.

  By tightening in the axial direction, the tapered roller bearings 119 and 121 are put into a temporary pressure application state via the shims 123a, 123b, 125a, and 125b.

  Next, the connecting hollow shaft 33 is attached to the case main body 69 which is one of the first and second divided case portions together with the tapered roller bearings 119, 121, the shims 123a, 123b, 125a, 125b and the jig 145. On the other hand, the tapered roller bearings 119 and 121 are assembled so as to be attached to the divided portions of the bearing attachment holes 91 and 93 (see FIG. 6C).

  At this time, the third split case portion 89 to which the rear wheel side output shaft 37 is attached via the tapered roller bearings 133 and 135 is also assembled.

  Thereafter, the case cover 71 which is the other of the first and second divided case portions is coupled to the case main body 69 by the coupling surface 67. This connection is fastened by tightening the bolt 73.

  At this time, the outer cylindrical portions 161, 165, which are circular portions of the jig 145, are seal support holes 97, 99, 101, which are inner peripheral surfaces that are continuous with the end openings 102, 104 of the distribution case 9. The case cover 71 can be attached to the case main body 69.

  Thereafter, at least one of the nuts 153 and 155 is unscrewed to release the tightening of the jig 145. With this release, the screw shaft 151 is pulled out from the connecting hollow shaft 33 and the circular portion of the jig 145 is pulled out from the end openings 102 and 104 of the distribution case 9 in the axial direction.

Thereafter, seal members 127 and 129 are interposed between the seal support hole portions 97 and 99 and the seal support shaft portions 122 and 114.

Thereafter, lubricating oil can be injected from the opening 105 and a filler plug 107 can be attached to form an oil complete structure in which the lubricating oil is enclosed.
[Seal support shaft]
7A and 7B show a seal support shaft portion, wherein FIG. 7A is a cross-sectional view of a main part showing a seal support shaft portion according to the first embodiment, and FIG. 7B is a cross-sectional view of a main portion showing a seal support shaft portion according to a comparative example. FIG.

  FIG. 7A shows a structure in which the seal support shaft portion 114 is formed integrally with the connection hollow shaft 33. FIG. 7B shows a structure in which the seal support shaft portion 114 a is formed integrally with the concatenated hollow shaft 33 by press fitting or the like.

  In the structure of FIG. 7B, the following assembling procedure is performed.

  2 will be described in place of the seal support shaft portion 114a of FIG. 7B. First, the rear wheel side output shaft with respect to the case body 69 of the distribution case 9 with the case cover 71 removed. The third divided case portion 89 to which 37 is attached via the tapered roller bearings 133 and 135 is assembled, and the connecting hollow shaft 33 is assembled via the tapered roller bearings 119 and 121.

  At this time, the shims 123a and 123b on the tapered roller bearing 119 side are assembled in advance in the divided portion on the case body 69 side of the bearing mounting hole 91.

  Thereafter, the shims 125 a and 125 b on the other tapered roller bearing 121 side are driven from the inner diameter side of the divided portion of the bearing mounting hole 93.

  This driving is performed for the shim 125b after the washer 126 and the shim 125a are arranged first, and the shim 125b is driven between the washer 126 and the shim 125a.

  By assembling the shims 125a and 125b, even if the distribution case 9 is formed of a light aluminum alloy or the like, the case main body 69 can be prevented from being damaged by the driving of the shim 125b.

  Thereafter, the seal support shaft portion 114a is press-fitted into the connecting hollow shaft 33 and integrally coupled.

  Thereafter, the case cover 71 is abutted against the case main body 69 by the coupling surface 67 and is fastened and coupled by the bolt 73. At this time, in the case cover 71, the distance between the axial walls facing the axial direction of the divided portions in the bearing mounting hole portions 91 and 93 is larger than the distance between the axial outer surfaces of the shims 123a and 125a previously incorporated. By setting it slightly larger, the divided portions of the bearing mounting hole portions 91 and 93 of the case cover 71 can be easily combined with the shims 123a and 125a incorporated on the case body 69 side.

Thereafter, seal members 127 and 129 are interposed between the seal support hole portions 97 and 99 and the seal support shaft portions 122 and 114a, so that an oil complete structure in which lubricating oil is enclosed can be obtained.

  Therefore, in the structure of FIG. 7B, the seal support shaft portion 114 a needs to be integrated with the connection hollow shaft 33 by retrofitting in order to obtain an oil complete structure in which lubricating oil is enclosed.

  On the other hand, in the first embodiment, as shown in FIG. 7A, even if the seal support shaft portion 114 is formed integrally with the connection hollow shaft 33, the oil complete structure is obtained by the assembly as described above. be able to.

[Sim variants]
FIG. 8 shows the relationship between the tapered roller bearing and the shim, (a) and (b) are enlarged cross-sectional views of the main part according to a modified example of the first embodiment of the present invention, and (c) according to a comparative example. It is a principal part expanded sectional view.

FIG. 8 relates to the structure on the tapered roller bearing 121 side. As shown in FIG. 8C, when the seal support portion 114a of the connecting hollow shaft 33 has a press-fit structure and a shim is driven in, the distribution case 9 In order to avoid scratches, the shim 125b is driven after the shim 125a is arranged.
On the other hand, in the structure in which the shim is not driven in as in the first embodiment of the present invention,
A structure in which the shim 125b is omitted as shown in FIG. 8A or a structure in which only the shim 125c is used as shown in FIG.

  In the structure of FIG. 8B, the outer race 121a of the tapered roller bearing 121 is protruded from the inner race 121b to the shim 125c side by the dimension s1 by the amount that the washer 126 of FIG. 8A is omitted. .

  9A and 9B show the relationship between the tapered roller bearing and the shim. FIG. 9A is an enlarged cross-sectional view of a main part according to a modification of the first embodiment of the present invention, and FIG. FIG.

  FIG. 9 relates to the structure on the tapered roller bearing 119 side, and is as shown in FIG. 9 (a) with respect to FIG. 9 (b) which is the first embodiment of the present invention. That is, the outer race 119a of the tapered roller bearing 119 is protruded from the inner race 119b to the shim 123c side by the dimension s2, and the shim 125c is one sheet. The dimension s2 may be the same as the dimension s1.

[Modification of assembly of jig and transfer]
FIG. 10 is a cross-sectional view corresponding to FIG. 6B and showing a state in which temporary pressurization is applied to the shim by a jig.

  The jig 145A includes a pair of contact movable portions 147A and 149A and a bolt 151A and a bridge 153A as male and female screw members.

  The contact movable parts 147A and 149A are composed of circular wall parts 157A and 159A, outer cylinder parts 161A and 165A, and inner shaft parts 163A and 167A.

  Circumferential wall portions 157A, 159A and outer cylinder portions 161A, 165A are integrally coupled, and outer cylinder portions 161A, 165A are provided with circumferentially shaped distal end side portions 161aA, 165aA. The contact portions 169A and 171A are formed in a stepped shape. The contact portions 169A and 171A are formed in the same shape as the contact portions 169 and 171.

  Circumferential wall portions 157A and 159A and inner shaft portions 163A and 167A are integrally formed. Fitting heads 173A and 175A are formed on the inner shaft portions 163A and 167A, and are configured to be fitted and guided in the shaft holes 177 and 179 of the connecting hollow shaft 33.

  The abutting movable portion 147A is provided integrally with the bridge 153A at the circumferential wall portion 157A, and the tip of the bolt 151A abuts against the abutting movable portion 149A via the ball 185 at the circumferential wall portion 157A. The bolt 151A is screwed into the bridge 153A.

  The jig 145A shown in FIG. 10 temporarily applies pressure to the tapered roller bearings 119 and 121 via the contact movable parts 147A and 149A and the shims 123a, 123b, 125a, and 125b by tightening the bolt 151A into the bridge 153A. Can be granted.

  The connecting hollow shaft 33 is assembled to the case body 69 together with the tapered roller bearings 119, 121, the shims 123a, 123b, 125a, 125b, and the jig 145A in the same manner as in FIG.

The removal of the jig 145A can be performed by releasing the tightening of the bolt 151A.
[Effect of Example 1]
In the first embodiment of the present invention, the distribution case 9 in which the bearing mounting holes 91 and 93 are formed on the back side of the seal support holes 97, 99 and 101 that are continuous with the end openings 102 and 104, and the bearing mounting hole 91. , 93, a connecting hollow shaft 33 on which bearing mounting shaft portions 111, 113 are rotatably supported via tapered roller bearings 119, 121, the bearing mounting hole portions 91, 93, and the tapered roller bearing 119. , 121 and shims 123 a, 123 b, 125 a, 125 b that are interposed between the shaft directions and apply axial pressure, wherein the distribution case 9 includes the bearing mounting holes 91, A combination of a case main body 69 and a case cover 69 which are abutted and coupled by a coupling surface 67 along a plane including the axis of 93, and the shims 123a, 125a The inner peripheral diameter of 125b is set to be smaller than the seal support holes 97, 99, 101 that are continuous with the end openings 102, 104 of the distribution case 9, and is continuous with the end openings 102, 104 of the distribution case 9. The shape of the seal support holes 97, 99, 101 is changed to the outer cylinder portions 161, 165 of the jig 145 (145A) extending from the end openings 102, 104 to the outside of the distribution case 9 while contacting the shims 123a, 125a. 161A, 165A) can be included, and the outer cylinder portions 161, 165 (161A, 165A) of the jig 145 (145A) are formed so as to be able to be pulled out from the end openings 102, 104 in the axial direction.

  For this reason, before assembling the connecting hollow shaft 33 to the distribution case 9, the tapered roller bearings 119 and 121 are attached to the bearing mounting shaft portions 111 and 113, and the tapered roller bearings 119 and 121 are attached to the tapered roller bearings 119 and 121. The shims 123a, 123b, 125a, and 125b are arranged at the assembly position, and the outer cylinder portions 161 and 165 (161A and 165A) of the jig 145 (145A) are brought into contact with the shims 123a and 125a to be held in the axial direction. A temporary pressurizing state can be obtained by generating force and tightening.

  The connecting hollow shaft 33 is connected to the case main body 69 together with the tapered roller bearings 119, 121 together with the tapered roller bearings 119, 121, shims 123a, 123b, 125a, 125b, and a jig 145 (145A). Are assembled so that they can be attached to the divided portions of the bearing mounting holes 91 and 93, and then the case cover 71 is coupled to the case main body 69 by the coupling surface 67, and the outer cylinder portion of the jig 145 (145A) is assembled. 161, 165 (161A, 165A) are enclosed in seal support holes 97, 99, 101 which are continuous with the end openings 102, 104 of the distribution case 9, and then tightened to clamp the jig 145 (145A). The jig 145 (145A) is released from the end openings 102 and 104 of the distribution case 9 Cylindrical portion 161,165 (161A, 165A) can be pulled out in the axial direction.

  Therefore, even when the distribution case 9 is not provided with a cover on the side in the axial direction of the connecting hollow shaft 33, the shim 125b can be assembled without the need for driving, and the case main body 69 and the like are not damaged by the shim 125b. .

  Further, according to the transfer 1 assembly method, the tapered roller bearings 119 and 121 are attached to the bearing mounting shaft portions 111 and 113 before the coupling hollow shaft 33 is assembled to the distribution case 9, and the tapered roller The shims 123a, 123b, 125a, 125b are arranged at the assembly positions with respect to the bearings 119, 121, and the outer cylinder portions 161, 165 (161A, 165A) of the jig 145 (145A) are placed on the shims 123a, 125a. A temporary pressurizing state is generated by generating a force to be brought into contact and pinching in the axial direction and tightening, and the connecting hollow shaft 33 is connected to the tapered roller bearings 119, 121 and shims 123a, 123b, 125a, 125b. And the jig 145 (145A) together with the case body 69 The tapered roller bearings 119 and 121 are assembled so as to be attached to the divided portions of the bearing mounting holes 91 and 93, and then the case cover 71 is coupled to the case main body 69 by the coupling surface 67 and the jig is fixed. The outer cylinder parts 161, 165 (161A, 165A) of the tool 145 (145A) are enclosed in the seal support holes 97, 99, 101 that are continuous with the end openings 102, 104 of the distribution case 9, and then the jig 145. (145A) is released from the tightening, and the outer cylindrical portions 161, 165 (161A, 165A) of the jig 145 (145A) are pulled out from the end openings 102, 104 of the distribution case 9 in the axial direction. The shims 123a, 123b, 125a, 125b can be assembled.

  Furthermore, the contact movable parts 147 and 149 (147a and 149a) provided with the distal end side parts 161a and 165a (161aA and 165aA) of the outer cylinder parts 161 and 165 (161A and 165A), and the contact movable parts 147 and 147, 149 (147a, 149a) is tightened and moved in the axial direction by a jig 145 (145A) having a screw shaft 151 and nuts 153, 155 (bolts 151A and bridges 153A), and the shims 123a, 123b, 125a, 125b Assembly can be performed.

  11 is a cross-sectional plan view showing the final drive together with the jig, FIG. 12 is a schematic side view of the carrier case, and FIG. 13 shows the rear differential device together with the jig to apply temporary pressure to the shim. FIG. Note that components corresponding to those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The driving force transmission device of the second embodiment is applied as a rear wheel side final drive 1B.

  In other words, in the second embodiment, a drive pinion shaft 49B as an input shaft and a differential case 187 of a rear differential device 53B as a rotating body are rotatable on a carrier case 57B as a case. It is supported.

  As shown in FIG. 12, the carrier case 57B has a case main body 69B as a first divided case portion and a carrier case as a second divided case portion by a coupling surface 67B along the rotational axis of the ring gear 55B. The carrier cover 71B is joined to the case main body 69B by a bolt 73B, which is divided and formed into a cover 71B and a joining surface 67B is abutted.

  In the present embodiment, the coupling surface 67B is formed so as to be inclined with respect to the vertical direction toward the distal end side of the drive pinion gear 51B (drive pinion shaft 49B) so that the upper side of the coupling surface 67B is inclined backward.

  As shown in FIG. 11, the drive pinion shaft 49B is supported on the case main body 69B of the carrier case 57B by tapered roller bearings 188 and 190 serving as bearings. The drive and pinion shaft 49B has a connecting member 189 fastened at one end by a nut 191 and a drive and pinion gear 51B at the other end. A seal member 193 is provided between the coupling member 189 and the carrier case 57B.

  The differential case 187 is supported between the case main body 69B of the carrier case 57B and the carrier cover 71B by tapered roller bearings 119B and 121B as bearings. One shim 195, 197 is interposed between the tapered roller bearings 119B, 121B and the carrier case 57B. However, the number of shims 195 and 197 is arbitrary, and a plurality of shims can be used as in the above embodiment.

  A ring gear 55B that is orthogonally engaged with the drive pinion gear 51B is attached to the flange portion 199 of the differential case 187 by a bolt 201.

  A pinion gear 205 is rotatably supported in the differential case 187 via a pinion shaft 203. A pair of side gears 207 and 209 are meshed with and coupled to the pinion gear 205, and relative rotation between the side gears 207 and 209 is allowed. The rear wheel axles are splined to the side gears 207 and 209, respectively.

  Therefore, the driving force input from the drive pinion shaft 49B to the differential case 187 of the rear differential device 53B via the drive pinion gear 51B and the ring gear 55B is transferred to the left and right rear via the rear wheel axle. It can be transmitted to the wheel.

  In the second embodiment, the differential case 187 has inner peripheral surfaces 211, 213 continuous with the end openings 102B, 104B at both ends, and bearing mounting holes 91B, 93B is formed.

  The inner peripheral diameters of the shims 195 and 197 are set smaller than the inner peripheral diameters of the inner peripheral surfaces 211 and 213.

  The assembling jig 145B is the same as the jig 145A shown in FIG. Accordingly, the reference numeral A of the corresponding component is substituted for B, and redundant description is omitted.

  As shown in FIG. 13, the jig 145B shown in FIG. 11 generates a force for clamping the bolt 151B to the bridge 153B, and tightens the taper roller bearing via the contact movable parts 147B and 149B and the shims 195 and 197. Temporary pressurization can be applied to 119B and 121B.

  The rear differential unit 53B (differential case 187) is assembled to the case main body 69B together with the tapered roller bearings 119B and 121B, the shims 195 and 197, and the jig 145B in the same manner as in FIG.

  The removal of the jig 145B can be performed by releasing the tightening of the bolt 151B.

Therefore, the present embodiment can achieve the same effects as those of the above embodiment.
[Others]
Oil pressure or the like can also be used as means for bringing the circumferential portion of the jig into contact with the pressurizing member and clamping it in the axial direction.

  Further, the circumferential portion of the jig is not limited to an annular shape that is continuous in the circumferential direction, and may be a structure that is divided into a plurality of intermittent portions as long as it can apply a substantially uniform pressing force to the shim in the circumferential direction.

It is a skeleton top view of a four-wheel drive vehicle. (Example 1) It is a plane sectional view of a transfer. (Example 1) It is the schematic of the III arrow direction of FIG. (Example 1). It is a principal part expanded sectional view which shows the relationship between a taper roller bearing, and a shim with a part of jig | tool. (Example 1) It is a principal part expanded sectional view which shows the relationship between a taper roller bearing, and a shim with a part of jig | tool. (Example 1) The assembly method of a transfer is shown with a jig | tool, (a) is sectional drawing which has arrange | positioned the taper roller bearing and the shim to the connection hollow shaft, (b) gives temporary pressurization to the shim with a jig. Sectional drawing which shows a state, (c) is sectional drawing of the state which assembled | attached the connection hollow shaft to the distribution case with the taper roller bearing, the shim, and the jig | tool. (Example 1) The seal support shaft part is shown, (a) is a principal part sectional view showing the seal support shaft part according to Example 1, and (b) is a principal part sectional view showing the seal support shaft part according to the comparative example. The relationship between the tapered roller bearing and the shim is shown. (A), (b) are enlarged sectional views of the main part according to a modified example of Example 1 of the present invention, and (c) are enlarged sectional views of the essential part according to a comparative example. FIG. The relationship between a taper roller bearing and a shim is shown. (A) is an enlarged cross-sectional view of a main part according to a modification of Example 1 of the present invention, and (b) is an enlarged cross-sectional view of the main part according to a comparative example. FIG. 7 is a cross-sectional view corresponding to FIG. 6B and showing a state in which temporary pressurization is applied to the shim by a jig. (Modification of Example 1) It is a plane sectional view showing a final drive with a jig. (Example 2) It is a schematic side view of a carrier case. (Example 2) FIG. 5 is a plan sectional view showing the rear differential device together with a jig and applying a temporary pressure to the shim. (Example 2)

Explanation of symbols

1 Transfer (driving force transmission device)
1B Final drive (driving force transmission device)
5 Front differential device 9 Distribution case (case)
33 Connecting hollow shaft (rotating body, input shaft, rotating shaft)
37 Rear wheel output shaft (output shaft)
49B Drive pinion shaft (input shaft)
53B Rear differential device 57B Carrier case (case)
67, 67B Coupling surface 69, 69B Case body (first divided case part)
71 Case cover (second split case part)
71B Carrier cover (second split case part)
97, 99, 101 Seal support hole (inner peripheral surface)
102, 102B, 104, 104B End opening 111, 113, 111B, 113B Bearing mounting shaft portion 119, 121, 119B, 121B Taper roller bearing (bearing)
123a, 123b, 125a, 125b, 195, 197 shim (pressurizing member)
127, 129 Seal member 145, 145B Jig 161, 165, 161A, 165A, 161B, 165B Outer cylinder part (circular shape part of jig)
187 Differential case (rotary body, output shaft)

Claims (7)

A case in which a bearing mounting hole is formed on the back side of the inner peripheral surface continuous to the end opening;
A rotating body in which a bearing mounting shaft is rotatably supported via a bearing in the bearing mounting hole;
A pressurizing member that is interposed between the bearing mounting hole portion and the bearing in the axial direction and applies an axial pressure;
A driving force transmission device comprising:
The case is a combination of first and second divided case portions that are abutted and coupled by a coupling surface along a plane including the axis of the bearing mounting hole.
An inner peripheral diameter of the pressurizing member is set smaller than an inner peripheral surface continuous with the end opening of the case,
The shape of the inner peripheral surface that is continuous with the end opening of the case can be included in the circular shape portion of the jig that extends from the end opening to the outside of the case while contacting the pressurizing member. The part of the circular shape is formed so that it can be pulled out from the end opening in the axial direction,
The rotating body is a rotating shaft coupled to the rear wheel output side of the differential device.
A driving force transmission device characterized by that. A case in which a bearing mounting hole is formed on the back side of the inner peripheral surface continuous to the end opening;
A rotating body in which a bearing mounting shaft is rotatably supported via a bearing in the bearing mounting hole;
A pressurizing member that is interposed between the bearing mounting hole portion and the bearing in the axial direction and applies an axial pressure;
The case is a combination of first and second divided case portions that are abutted and coupled by a coupling surface along a plane including the axis of the bearing mounting hole.
An inner peripheral diameter of the pressurizing member is set smaller than an inner peripheral surface continuous with the end opening of the case,
The shape of the inner peripheral surface that is continuous with the end opening of the case can be included in the circular shape portion of the jig that extends from the end opening to the outside of the case while contacting the pressurizing member. An assembly method of a driving force transmission device for assembling a driving force transmission device formed so that the circumferentially-shaped portion can be pulled out from the end opening to the outside in the axial direction,
Before assembling the rotating body to the case, the bearing is attached to the bearing mounting shaft,
The pressurizing member is disposed at the assembly position with respect to the bearing, and a temporary pressurizing state is provided by bringing the circumferential portion of the jig into contact with the pressurizing member and holding it in the axial direction.
Assembling the rotating body together with the bearing, the pressure applying member, and the jig so that the bearing is attached to one of the first and second divided case portions in the divided portion of the bearing mounting hole portion,
Thereafter, the other of the first and second divided case portions is coupled to one of the first and second divided case portions by the coupling surface, and the circular portion of the jig is used as an end opening of the case. Included in the continuous inner peripheral surface,
Thereafter, the clamping of the jig is released, and the circumferentially shaped part of the jig is pulled out in the axial direction from the end opening of the case.
A method of assembling the driving force transmission device. The driving force transmission device according to claim 1 ,
A seal support hole is provided on the inner peripheral surface continuous to the end opening of the case,
The outer peripheral surface of the seal member is fitted to the inner peripheral surface of the seal support hole,
An inner peripheral diameter of the pressurizing member is set smaller than an inner peripheral diameter of the seal support hole,
The seal member slides with the rotating body;
A driving force transmission device characterized by that. The driving force transmission device according to claim 1 or 3,
The case is configured to rotatably support an input / output shaft arranged to intersect and transmit driving force through a bearing,
The first and second divided case portions of the case can be abutted and coupled by a coupling surface along a plane including the axis of the input shaft as the rotating body.
A driving force transmission device characterized by that. A jig used in the assembly method of the driving force transmission device according to claim 2 ,
A contact movable part provided with a tip side part of the circular shape;
A member for holding and moving the abutting movable part in the axial direction;
A jig characterized by comprising: An assembly method for a driving force transmission device according to claim 2 ,
A seal support hole is provided on the inner peripheral surface continuous to the end opening of the case,
The outer peripheral surface of the seal member is fitted to the inner peripheral surface of the seal support hole,
The inner peripheral diameter of the pressurizing member was set smaller than the inner peripheral diameter of the seal support hole portion,
A method of assembling the driving force transmission device. An assembly method for a driving force transmission device according to claim 2 ,
The case is configured to rotatably support an input / output shaft arranged to intersect and transmit driving force through a bearing,
The first and second divided case portions of the case can be abutted and coupled by a coupling surface along a plane including the axis of the input / output shaft as the rotating body.
A method of assembling the driving force transmission device.

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