JP2019038488A - Transfer device for vehicle - Google Patents

Abstract

To provide a transfer device for a vehicle, which, while achieving a compact configuration, ensures a fitting performance for a universal joint of a propeller shaft on a transfer device side as well as prevent separation of the propeller shaft.SOLUTION: In a transfer device 10 for a vehicle, in which a propeller shaft 30 having a universal joint 31 is coupled to a front-wheel output shaft 12 parallel to a rear-wheel output shaft 11, an end part of the front-wheel output shaft 12 is spline-fitted on a shaft-like part 61 provided on an outer joint member 33 of the universal joint 31 of the propeller shaft 30, and a bolt member 20 is provided, which is inserted from an end part, opposite the propeller shaft, of the front-wheel output shaft 12 and is fastened to the shaft-like part 61 of the propeller shaft 30, thereby mounting the propeller shaft 30 on the front-wheel output shaft 12.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle transfer device, and more particularly to a vehicle transfer device applied to a four-wheel drive vehicle.

  As a four-wheel drive vehicle, a drive source such as an engine and a transmission are arranged at the front of the vehicle body so that the shaft center extends in the longitudinal direction of the vehicle body, and the driving force transmitted from the transmission is output for the rear wheels extending rearward of the vehicle body Transfer from the shaft to the rear wheel as the main driving wheel via the rear wheel propeller shaft and the rear wheel differential, and the driving force transmitted to the front wheel as the auxiliary driving wheel on the rear wheel output shaft The drive force extracted to the front wheel output shaft of the transfer device is transmitted to the front wheels via the front wheel propeller shaft and the front wheel differential that extend forward of the vehicle body, and the front wheels can be driven in addition to the rear wheels A so-called FR (front engine / rear drive) -based four-wheel drive vehicle is known.

  As such a transfer device, a coupling for taking out the driving force for the front wheels is arranged on the output shaft for the rear wheels, and the driving force taken out by the coupling is passed through a chain type or gear type power transmission mechanism. There is known one that transmits to a front wheel output shaft.

  In the four-wheel drive vehicle equipped with the transfer device, the front wheel propeller shaft and the rear wheel propeller shaft are respectively connected to the front wheel output shaft and the rear wheel output shaft via a universal joint provided at the end on the transfer device side. It is common to connect to.

  As a transfer device for a four-wheel drive vehicle, for example, in Patent Document 1, a coupling is provided on a rear wheel output shaft to which a driving force is transmitted from a transmission, and a driving force for a front wheel taken out by the coupling is disclosed. Is transmitted to the front wheel output shaft via a gear-type power transmission mechanism, and the driving force transmitted to the front wheel output shaft is transmitted to the front wheel propeller shaft connected to the front wheel output shaft. Has been.

JP 2017-65389 A

  In vehicles such as automobiles, it is required to expand the passenger compartment space in order to improve the comfort of passengers, and it is also required to expand the passenger compartment space in a four-wheel drive vehicle. For this reason, in an FR-based four-wheel drive vehicle or the like, the transfer device is housed in a tunnel portion provided on the center side in the vehicle width direction of the passenger compartment floor, so that the output shaft for the rear wheel of the transfer device and the front wheel It is desired to reduce the distance between the output shaft and the transfer device to be compact.

  As described above, when the propeller shaft is connected to the front wheel output shaft arranged in parallel to the rear wheel output shaft in the transfer device, the shaft-like portion provided on the propeller shaft universal joint member on the front wheel output shaft. May be fitted with a spline and a clip may be attached to the shaft portion of the propeller shaft to prevent the propeller shaft from coming off.

  FIG. 8 is a cross-sectional view showing a part of a conventional vehicle transfer device. A transfer device 200 shown in FIG. 8 is mounted on an FR-based four-wheel drive vehicle, and a front wheel output shaft 201 disposed parallel to the rear wheel output shaft, and a driving force is output from the rear wheel output shaft. It has a power transmission mechanism 202 that transmits to the shaft 201.

  The power transmission mechanism 202 includes a driven gear 203 that meshes with a drive gear provided on the rear wheel output shaft and is connected to the front wheel output shaft 201, and is taken out by a coupling provided on the rear wheel output shaft. Further, the driving force for the front wheels is transmitted to the front wheel output shaft 201.

  Further, the front wheel output shaft 201 is spline-fitted with a shaft-like portion 213 provided on the outer joint member 212 constituting the universal joint 211 of the propeller shaft 210, and the shaft-like portion 213 of the propeller shaft 210 has a shaft-like shape. The clip 216 attached to the circumferential groove 215 formed in the spline part 214 of the part 213 is spline-fitted to the front wheel output shaft 201 so as to be positioned on the rear side of the vehicle body from the spline part 204 of the front wheel output shaft 201.

  When the shaft-like portion 213 of the propeller shaft 210 is moved to the front side of the vehicle body with respect to the front wheel output shaft 201, the clip 216 is engaged with the end surface 205 on the rear side of the vehicle body of the spline portion 204 of the front wheel output shaft 201. As a result, the propeller shaft 210 is prevented from coming off.

  In this way, in the transfer device that attaches the clip to the shaft portion of the propeller shaft that is spline-fitted to the front wheel output shaft and prevents the propeller shaft from coming off, the shaft between the rear wheel output shaft and the front wheel output shaft In order to shorten the distance and make the transfer device compact, the shaft of the propeller shaft is spline-fitted to the front wheel output shaft and the universal joint of the propeller shaft is assembled to the transfer device. The propeller shaft universal joint may interfere with the case.

  On the other hand, considering the ease of assembly of the propeller shaft universal joint, it is conceivable to shorten the shaft portion of the propeller shaft that is spline-fitted to the front wheel output shaft, but the shaft portion of the propeller shaft is shortened. Then, the propeller shaft is pulled out by a clip that requires the formation of a circumferential groove in the shaft portion of the propeller shaft due to the drive force transmitted by the spline fitting portion between the shaft portion of the propeller shaft and the output shaft for the front wheels. It may be difficult to stop.

  SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a vehicle transfer device that can be configured compactly while ensuring assembly of the universal joint of the propeller shaft on the transfer device side and suppressing the removal of the propeller shaft. To do.

  In order to solve the above problems, the present invention is configured as follows.

  First, the invention according to claim 1 of the present application is arranged in parallel to the main drive wheel output shaft, which is connected to the output shaft of the transmission and extends to one side in the vehicle longitudinal direction. An auxiliary drive wheel output shaft, and a power transmission mechanism that transmits the driving force extracted from the main drive wheel output shaft to the auxiliary drive wheel output shaft. A transfer device for a vehicle that extends to the other side in the front-rear direction and has a propeller shaft connected to an end on the output shaft side of the auxiliary drive wheel, the end of the output shaft for the auxiliary drive wheel on the propeller shaft side The part is hollow and is spline-fitted to a shaft-like part provided in a component of the universal joint in the propeller shaft, and is inserted into the auxiliary drive wheel output shaft from the end on the side opposite to the propeller shaft, and the tip part is Propeller Wherein the bolt member for mounting said propeller shaft to said auxiliary drive wheel output shaft by being tightened screwed to the shaft-like portion of the shift are provided.

  The invention according to claim 2 is the invention according to claim 1, wherein the spline fitting between the propeller shaft side end portion of the auxiliary drive wheel output shaft and the shaft portion of the propeller shaft is It is a press-fitting fitting that is press-fitted by tightening the bolt member.

  The invention according to claim 3 is the invention according to claim 1, wherein the spline fitting between the propeller shaft side end portion of the auxiliary drive wheel output shaft and the shaft portion of the propeller shaft is Non-press-fit, and the bolt member has an intermediate portion having a smaller diameter than the tip portion.

  The invention according to claim 4 is the invention according to claim 1, wherein the spline fitting between the propeller shaft side end portion of the auxiliary drive wheel output shaft and the shaft portion of the propeller shaft is The auxiliary drive wheel output shaft is hollow, and a sleeve member is fitted inside the auxiliary drive wheel output shaft. The bolt member is inserted into the sleeve member from the end on the side opposite to the propeller shaft. Is inserted and screwed into the shaft-shaped portion of the propeller shaft to be tightened, the sleeve member is sandwiched between the shaft-shaped portion of the propeller shaft and the head of the bolt member. A propeller shaft is attached to the auxiliary drive wheel output shaft.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the sleeve member includes an extension portion extending on one side in the axial direction from the auxiliary drive wheel output shaft, and the sleeve member is extended. A seal member is disposed between the portion and the transfer case.

  According to the first aspect of the present invention, in the transfer device for a vehicle in which the propeller shaft having a universal joint is connected to the auxiliary drive wheel output shaft parallel to the main drive wheel output shaft, the auxiliary drive wheel output The end portion of the shaft on the propeller shaft side is spline-fitted to the shaft-like portion provided in the component of the universal joint of the propeller shaft, and is inserted into the auxiliary drive wheel output shaft from the end portion on the side opposite to the propeller shaft. A bolt member for attaching the propeller shaft to the output shaft for the auxiliary drive wheel by being tightened to the shaft-like portion is provided.

  As a result, the bolt member is inserted from the end of the auxiliary drive wheel output shaft on the side opposite to the propeller shaft into the shaft portion of the propeller shaft that is spline-fitted to the end of the output shaft for the auxiliary drive wheel on the side of the propeller shaft. Since the propeller shaft is attached to the output shaft for the auxiliary drive wheel by tightening, the spline between the output shaft for the auxiliary drive wheel and the shaft-shaped portion of the propeller shaft is compared with the case where the clip is used to prevent the propeller shaft from coming off. The fitting portion can be shortened to prevent the propeller shaft from coming off.

  Since the spline fitting part between the auxiliary drive wheel output shaft and the shaft of the propeller shaft can be shortened, the distance between the main drive wheel output shaft and the auxiliary drive wheel output shaft can be shortened to make the transfer device compact. Even in the case of the configuration, the universal joint of the propeller shaft can be assembled to the transfer device while suppressing interference with the case of the transmission coupled to the transfer device, and the universal joint of the propeller shaft on the transfer device side can be assembled. Sex can be secured.

  Therefore, it is possible to secure the assembling property of the universal joint of the propeller shaft on the transfer device side and to prevent the propeller shaft from coming off while having a compact configuration.

  According to the second aspect of the present invention, the spline fitting between the output shaft for the auxiliary drive wheel and the shaft portion of the propeller shaft is a press-fitting that is press-fitted by tightening the bolt member, thereby assisting. Since the spline fitting portion between the output shaft for the drive wheel and the shaft portion of the propeller shaft can eliminate the backlash in the rotational direction, the output shaft for the auxiliary drive wheel and the shaft portion of the propeller shaft can be rotated integrally. The bolt member can be prevented from loosening with respect to the shaft-like portion of the propeller shaft, and the above effect can be obtained effectively. The shaft-like portion of the propeller shaft can be press-fitted into the auxiliary drive wheel output shaft relatively easily using a bolt member without using a press-fitting device or the like, and the above-described effect can be obtained more effectively.

  According to the invention described in claim 3, the bolt member has an intermediate portion having a diameter smaller than that of the tip portion, whereby the torsional rigidity of the intermediate portion of the bolt member is reduced, and the intermediate portion assists driving. Relative rotation due to backlash in the rotational direction at the spline fitting portion between the wheel output shaft and the shaft portion of the propeller shaft can be absorbed, so that the spline fitting between the auxiliary drive wheel output shaft and the shaft portion of the propeller shaft is possible. It is possible to suppress the bolt member from loosening with respect to the shaft-like portion of the propeller shaft by relative rotation due to backlash in the rotation direction at the joint portion, and the above effect can be obtained effectively.

  According to the fourth aspect of the present invention, the bolt member is inserted into the sleeve member fitted to the output shaft for the auxiliary drive wheel and is tightened to the shaft-like portion of the propeller shaft, so that the sleeve member becomes the shaft of the propeller shaft. The propeller shaft is attached to the output shaft for the auxiliary drive wheel by being sandwiched between the shape portion and the head of the bolt member. As a result, the propeller shaft is attached to the auxiliary drive wheel output shaft in a state where the bolt members are integrally assembled, so the rotation direction in the spline fitting portion between the auxiliary drive wheel output shaft and the shaft portion of the propeller shaft It is possible to suppress the bolt member from loosening with respect to the shaft-like portion of the propeller shaft due to the relative rotation due to the backlash, and the above effect can be obtained effectively.

  According to the fifth aspect of the present invention, the sleeve member includes an extension portion extending in one axial direction from the auxiliary drive wheel output shaft, and the seal member is provided between the extension portion of the sleeve member and the transfer case. Arranged. Thus, the auxiliary drive wheel output shaft and the shaft member of the propeller shaft are supplied into the transfer case between the output shaft for the auxiliary drive wheel and the sleeve member, which are relatively rotated by the backlash in the spline fitting portion of the shaft portion of the propeller shaft. The lubricating oil thus produced can be supplied from one axial side of the auxiliary drive wheel output shaft, and the above-described effects can be more effectively achieved.

It is the schematic which shows the power transmission mechanism of the four-wheel drive vehicle by which the transfer apparatus which concerns on 1st Embodiment of this invention is mounted. It is sectional drawing which shows the principal part of the transfer apparatus of FIG. It is explanatory drawing for demonstrating the spline part of the shaft-shaped part of the output shaft for front wheels, and a propeller shaft. It is explanatory drawing for demonstrating the assembly | attachment method of the transfer apparatus of FIG. It is sectional drawing which shows the transfer apparatus of the vehicle which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the transfer apparatus of the vehicle which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the transfer apparatus of the vehicle which concerns on 4th Embodiment of this invention. It is sectional drawing which shows a part of conventional transfer apparatus of a vehicle.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing a power transmission mechanism of a four-wheel drive vehicle equipped with a vehicle transfer device according to a first embodiment of the present invention. As shown in FIG. 1, a four-wheel drive vehicle 1 equipped with a transfer device according to a first embodiment of the present invention is a four-wheel drive vehicle based on a front engine and a rear drive vehicle, and has a drive source at the front of the vehicle body. The engine 2 and the transmission 3 are arranged so that the shaft center extends in the longitudinal direction of the vehicle body.

  On the rear side of the transmission 3, the driving force transmitted from the engine 2 transmitted from the transmission 3 is applied to the rear wheel as the main driving wheel via the rear wheel propeller shaft extending to the rear of the vehicle body and the rear wheel differential. A transfer device 10 is provided that transmits the driving force transmitted to the front wheels as auxiliary driving wheels.

  The transfer device 10 is connected to the output shaft 3 a of the transmission 3 and extends to the rear side of the vehicle body, which is one side of the vehicle body in the longitudinal direction. A front wheel output shaft 12 as an auxiliary drive wheel output shaft disposed in parallel to the rear wheel output shaft 12, and a power transmission mechanism 13 for transmitting the driving force extracted from the rear wheel output shaft 11 to the front wheel output shaft 12. ing.

  The transfer device 10 is also provided on the rear wheel output shaft 11 and is coupled to the rear wheel output shaft 11 to extract the front wheel driving force from the driving force transmitted to the rear wheel output shaft 11. have. As the coupling 16, an electromagnetic coupling or the like is used.

  The power transmission mechanism 13 is of a gear type, is provided on the rear wheel output shaft 11 on the vehicle body front side of the coupling 16 and connected to the coupling 16, and on the front wheel output shaft 12. And a driven gear 15 that is coupled to the front wheel output shaft 12 and meshes with the drive gear 14. The driving force for the front wheels taken out from the rear wheel output shaft 11 by the coupling 16 is applied to the front wheel output shaft 12. Configured to communicate.

  A front-wheel propeller shaft 30 extending to the front side of the vehicle body is connected to the front-wheel output shaft 12 at the end portion on the front side of the vehicle body. The front wheel propeller shaft 30 has a universal joint 31 at an end on the rear side of the vehicle body, and is connected to the front wheel output shaft 12 via the universal joint 31.

  The front wheel propeller shaft 30 also has a universal joint 32 at the end on the front side of the vehicle body, and is connected to the input shaft 41 of the front wheel differential device 40 via the universal joint 32. The input shaft 41 of the front wheel differential 40 is connected to an axle 42 that is connected to the left and right front wheels, respectively.

  Thus, the driving force for the front wheels taken out from the rear wheel output shaft 11 by the coupling 16 is transmitted to the front wheel output shaft 12 via the power transmission mechanism 13, and the front wheel propeller shaft is transmitted from the front wheel output shaft 12. 30 and the front wheel differential 40 are transmitted to the front wheels.

  In the four-wheel drive vehicle 1, the coupling 16 takes out the driving force for the front wheels by changing the torque distribution between the front wheels and the rear wheels in the range of front wheels: rear wheels = 0: 100 to 50:50. Yes. The operation of the coupling 16 is controlled by a control unit (not shown).

  The transfer device 10 also includes a damper device 17 between the coupling 16 and the drive gear 14 on the rear wheel output shaft 11. In the damper device 17, the drive system on the front wheel side from the coupling 16 to the front wheel via the drive gear 14, the driven gear 15, the front wheel output shaft 12, the front wheel propeller shaft 30, and the front wheel differential device 40 is the torque of the engine 2. The resonance frequency that resonates with the fluctuation is configured to be lowered under the practical range of the engine 2.

  Next, the transfer device 10 will be described in more detail with reference to FIG.

  FIG. 2 is a cross-sectional view showing a main part of the transfer device of FIG. 1. In FIG. 2, the vehicle body front side of the transfer device is shown together with the vehicle body rear side of the transmission and the front wheel propeller shaft. As shown in FIG. 2, the transfer device 10 includes a transfer case 51, and the transfer case 51 includes a first case member 52 and a second case member 53 that are sequentially arranged from the front side of the vehicle body. The first case member 52 and the second case member 53 are fastened and fixed using fastening bolts (not shown).

  In the transfer case 51, a rear wheel output shaft 11 connected to the output shaft 3a of the transmission 3 and a front wheel output shaft 12 arranged in parallel to the rear wheel output shaft 11 are rotatably supported. ing.

  The output shaft 11 for the rear wheel is connected to the front end portion of the vehicle body by spline fitting the output shaft 3a of the transmission 3, and rotates together with the output shaft 3a of the transmission 3. The rear wheel output shaft 11 is also connected to a rear wheel propeller shaft at an end of the vehicle rear side.

  The power transmission mechanism 13 is disposed between the vertical wall portion 52 a of the first case member 52 and the vertical wall portion 53 a of the second case member 53 in the transfer case 51, and the drive gear 14 is mounted on the rear wheel output shaft 11. The driven gear 15 is disposed on the front wheel output shaft 12.

  Although not shown in FIG. 2, the coupling 16 is disposed on the vehicle body rear side of the vertical wall portion 53 a of the second case member 53 on the rear wheel output shaft 11. The coupling 16 includes an inner rotating member formed by the rear wheel output shaft 11, an outer rotating member coupled to the drive gear 14, and an inner rotating member disposed between the inner rotating member and the outer rotating member. And a plurality of friction plates alternately splined to the outer rotating member. The fastening state of the plurality of friction plates is controlled by the control unit.

  A cylindrical power transmission member 18 is coupled to the vehicle body front side of the outer rotating member of the coupling 16. The power transmission member 18 has an end on the vehicle body rear side coupled to the outer rotating member of the coupling 16, and an end on the vehicle body front side is spline fitted to the inner peripheral surface of the drive gear 14 and coupled to the drive gear 14. ing. As a result, the drive gear 14 is coupled to the coupling 16.

  The power transmission member 18 is also provided with the above-described damper device 17 between the coupling 16 and the drive gear 14, and a torsional damper is used as the damper device 17. It is also possible not to provide a damper device between the coupling 16 and the drive gear 14.

  The drive gear 14 includes a front-side extending portion 14a and a rear-side extending portion 14b that extend in a cylindrical shape on the vehicle body front side and the vehicle body rear side, respectively. The front-side extension portion 14a, the rear-side extension portion 14b, and the transfer case 51 is rotatably supported by the transfer case 51 via bearings 55 and 56 disposed between them.

  The driven gear 15 includes a rear-side extending portion 15a that extends to the rear side of the vehicle body and extends radially inward, and the radially inner side of the rear-side extending portion 15a is coupled to the front wheel output shaft 12 to output the front wheel. The shaft 12 is integrally formed.

  The driven gear 15 includes a bearing 57 disposed between the inner peripheral surface of the driven gear 15 and the transfer case 51, and a bearing 58 disposed between the rear side of the front wheel output shaft 12 and the transfer case 51. And is rotatably supported by the transfer case 51.

  The front wheel output shaft 12 is formed in a hollow shape, and extends in the vehicle body front-rear direction of a rear-side extending portion 15 a provided in the driven gear 15. A front wheel propeller shaft 30 (hereinafter referred to as “propeller shaft 30”) is connected to the front wheel output shaft 12 on the front side of the vehicle body via a universal joint 31.

  The universal joint 31 includes, as constituent members, an outer joint member 33 provided on the transfer device 10 side, an inner joint member 35 coupled to the shaft member 34 of the propeller shaft 30, an outer joint member 33, and an inner joint member 35. Between the outer joint member 33 and the inner joint member 35, and between the inner peripheral surface of the outer joint member 33 and the outer peripheral surface of the inner joint member 35. And a gauge 37 for holding the ball 36 so that power can be transmitted between the outer joint member 33 and the shaft member 34.

  The universal joint 31 also includes a cover member 38 provided so as to cover the movable range of the shaft member 34, and a boot 39 provided so as to cover between the shaft member 34 and the cover member 38. The cover member 38 is provided so as to extend in a substantially cylindrical shape from the outer joint member 33 to the front side of the vehicle body. The boot 39 is formed of an elastic material such as rubber, and the outer peripheral surface of the shaft member 34 and the inner periphery of the cover member 38. It is provided so as to seal between the surfaces.

  The outer joint member 33 of the universal joint 31 is provided with a shaft-like portion 61 that extends to the rear side of the vehicle body. The shaft-shaped portion 61 is formed in a substantially cylindrical shape, a screw hole 61 a is provided on the inner peripheral surface, and a spline portion 61 b extending in the axial direction of the shaft-shaped portion 61 is formed on the outer peripheral surface.

  A spline portion 12 a extending in the axial direction of the front wheel output shaft 12 is formed on the inner peripheral surface of the front wheel output shaft 12 on the front side of the vehicle body. The spline portion 61b of the shaft-shaped portion 61 of the propeller shaft 30 is fitted to the spline portion 12a of the front-wheel output shaft 12, and the end portion of the front-wheel output shaft 12 on the front side of the vehicle body and the shaft-shaped portion 61 of the propeller shaft 30 are connected. Splined.

  A bolt member 20 is inserted into the front wheel output shaft 12 through a washer 19 into the front wheel output shaft 12 from the rear end of the vehicle body. The transfer case 51 is formed with a bolt insertion hole 53b corresponding to an end of the front wheel output shaft 12 on the rear side of the vehicle body so that the washer 19 and the bolt member 20 can be inserted therethrough.

  The bolt member 20 includes a hexagonal head portion 21 and a shaft portion 22 extending from the head portion 21. The shaft portion 22 includes a distal end portion 23 having a screw portion and a base end portion 24 provided on the head side. And an intermediate portion 25 provided between the distal end portion 23 and the proximal end portion 24. The proximal end portion 24 is formed with a larger diameter than the intermediate portion 25, and the intermediate portion 25 is formed with substantially the same diameter as the distal end portion 23.

  The bolt member 20 is screwed into the screw hole 61a of the shaft-like portion 61 of the propeller shaft 30 and the screw portion 61 of the propeller shaft 30 is screwed to tighten the shaft-like portion 61 of the propeller shaft 30 to the front of the vehicle output shaft 12 for the front wheels. It is press-fitted and fitted to the end on the side. The bolt member 20 is fastened through the washer 19 so that the head 21 presses the end face of the front wheel output shaft 12 on the vehicle body rear side to generate a predetermined axial force.

  FIG. 3 is an explanatory diagram for explaining the spline portion of the shaft-like portion of the front wheel output shaft and the propeller shaft. As shown in FIG. 3, the spline portion 12 a formed at the front end of the front wheel output shaft 12 on the front side of the vehicle body has a tooth portion 12 b and a groove portion 12 c formed in parallel to the central axis C <b> 1 of the front wheel output shaft 12. Yes. On the other hand, the spline portion 61b formed in the shaft-like portion 61 of the propeller shaft 30 is formed with a tooth portion 61c and a groove portion 61d so as to have a predetermined twist angle θ with respect to the central axis C2 of the shaft-like portion 61. .

  In the transfer device 10, after the vehicle body rear side of the spline portion 61 b of the shaft-like portion 61 is fitted to the vehicle body front side of the spline portion 12 a of the front wheel output shaft 12, the bolt member 20 is rearward of the front wheel output shaft 12. The spline portion 61b of the shaft-like portion 61 is inserted into the shaft-like portion 61 of the propeller shaft 30 by screwing and tightening the tip portion 23 through the washer 19 from the end on the side, and the spline portion of the output shaft 12 for the front wheels. The shaft-like portion 61 of the propeller shaft 30 is attached to the end of the front wheel output shaft 12 on the front side of the vehicle body.

  As described above, in the transfer device 10, the bolt member 20 is inserted into the front wheel output shaft 12 from the end on the vehicle body rear side, and the front end portion 23 is screwed into the shaft-like portion 61 of the propeller shaft 30 to be tightened. A propeller shaft 30 is attached to the output shaft 12 for use.

  The transfer device 10 is also provided with a plurality of seal members for preventing the lubricating oil in the transfer case 51 from leaking to the outside. As shown in FIG. 2, a seal member 71 is disposed between the first case member 52 and the rear wheel output shaft 11, and between the first case member 52 and the vehicle front side of the front wheel output shaft 12. A seal member 72 is disposed, and a seal member 73 is disposed between the second case member 53 and the power transmission member 18 that is spline-fitted to the rearwardly extending portion 14 b of the drive gear 14. A seal member 74 is disposed between the front wheel output shaft 12 and the vehicle rear side of the front wheel output shaft 12.

  When the transfer device 10 configured in this manner is assembled to the four-wheel drive vehicle 1, as shown in FIG. 2, the transfer device 10 has a rear wheel output shaft 11 fitted to the output shaft 3a of the transmission 3 by spline fitting. At the same time, the end surface 51a on the vehicle body front side of the transfer case 51 is aligned with the end surface 4a on the vehicle body rear side of the case 4 of the transmission 3, and is fastened and fixed using a bolt member (not shown) to be coupled to the transmission 3. .

  The transmission 3 is an automatic transmission that includes a planetary gear mechanism and a transmission mechanism 5 having a frictional engagement element. The case 4 of the transmission 3 includes an internal transmission mechanism 5 and an output of the transmission 3. The shaft 3a is configured to extend to the rear side of the vehicle body. The case 4 of the transmission 3 has an end 4b on the rear side of the vehicle body that has a smaller radial dimension than the arrangement portion 4c of the transmission mechanism 5, and is located radially outward of the end portion 4b on the rear side of the vehicle body. A space 4d is provided. In the present embodiment, the universal joint 31 of the propeller shaft 30 is disposed in the space 4d.

  FIG. 4 is an explanatory diagram for explaining a method of assembling the transfer device of FIG. As shown in FIG. 4, when the transfer device 10 is coupled to the transmission 3, the transfer device 10 first has a rear wheel output shaft 11 spline-fitted to the output shaft 3 a of the transmission 3, and the transmission 3 The end surface 51a of the transfer case 51 is disposed so as to face the end surface 4a of the case 4 with a predetermined distance therebetween.

  A temporary fixing pin 54 is fixed to the transfer case 51 for temporarily fixing the transfer case 51 at a position separated from the case 4 of the transmission 3 by a predetermined distance. The temporary fixing pin 54 is provided so as to protrude from the end surface 51 a of the transfer case 51 to the case 4 side of the transmission 3.

  The temporary fixing pin 54 is formed in a substantially cylindrical shape using a resin material, and a flange portion 4 e provided on the rear side of the case 4 of the transmission 3 is engaged with a portion protruding from the end surface 51 a of the transfer case 51. A first protrusion 54a and a second protrusion 54b for stopping are provided. The first protrusion 54a and the second protrusion 54b are provided so as to protrude radially outward of the temporary fixing pin 54, and the second protrusion 54b is temporarily fixed as shown in FIG. 54 is formed to be elastically displaceable.

  A pin insertion hole 4 f is formed in the flange portion 4 e of the case 4 of the transmission 3 at a position corresponding to the temporary fixing pin 54. When the transfer device 10 is coupled to the transmission 3, the temporary fixing pin 54 fixed to the transfer case 51 is inserted into the pin insertion hole 4f of the case 4 of the transmission 3, and the flange portion 4e of the case 4 is temporarily fixed. The transfer case 51 is temporarily fixed at a predetermined distance from the case 4 by being locked between the first protrusion 54 a and the second protrusion 54 b of the pin 54. The first protrusion 54 a is elastically displaced radially inward when inserted through the pin insertion hole 4 f of the case 4.

  Next, with the transfer case 51 temporarily fixed to the case 4, as shown in FIG. 4, the propeller shaft 30 is disposed on the front side of the vehicle body of the front wheel output shaft 12, and the vehicle body of the front wheel output shaft 12 is disposed. The shaft-like portion 61 of the propeller shaft 30 is fitted to the front end portion.

  Then, the bolt member 20 is inserted through the washer 19 from the end of the front wheel output shaft 12 on the rear side of the vehicle body, and the front end portion 23 is screwed into the shaft-like portion 61 of the propeller shaft 30 to be tightened. The shaft portion 61 of the propeller shaft 30 is press-fitted and attached to the end of the output shaft 12 on the vehicle body front side, and the propeller shaft 30 is attached to the transfer device 10.

  When the propeller shaft 30 is attached to the transfer device 10, the transfer device 10 to which the propeller shaft 30 is attached is moved to the front side of the vehicle body, and the second protrusion 54b is located in the temporary fixing pin 54 as shown in FIG. The end surface 51a of the transfer case 51 is aligned with the end surface 4a of the case 4 of the transmission 3. Then, a transfer case 51 is fastened and fixed to the case 4 of the transmission 3 using a bolt member (not shown), and the transfer device 10 is coupled to the transmission 3.

  In the present embodiment, the transfer device 10 is temporarily fixed to the transmission 3, and the transfer device 10 is coupled to the transmission 3 after the propeller shaft 30 is attached to the transfer device 10, but the propeller shaft 30 is connected to the transfer device 3. If it does not interfere with the transmission 3 when it is attached to the transmission 10, the propeller shaft 30 can be attached to the transfer device 10 after the transfer device 10 is coupled to the transmission 3.

  In the transfer device 10, a chain type may be used as the power transmission mechanism 13, and the bolt member 20 may be tightened without using the washer 19. Further, although an automatic transmission is described as the transmission 3, it can be similarly applied to a manual transmission.

  As described above, in the transfer device 10 according to the present embodiment, the end portion on the propeller shaft side of the auxiliary drive wheel output shaft 12 is splined to the shaft-like portion 61 provided on the component member 33 of the universal joint 31 of the propeller shaft 30. The propeller shaft 30 is auxiliary-driven by being fitted and inserted into the auxiliary drive wheel output shaft 12 from the end on the side opposite to the propeller shaft and screwed into the shaft-like portion 61 of the propeller shaft 30 to be tightened. A bolt member 20 to be attached to the wheel output shaft 12 is provided.

  Accordingly, the bolt member extends from the end of the auxiliary drive wheel output shaft 12 on the side opposite to the propeller shaft to the shaft-like portion 61 of the propeller shaft 30 that is spline-fitted to the end of the auxiliary drive wheel output shaft 12 on the propeller shaft side. Since the propeller shaft 30 is attached to the auxiliary drive wheel output shaft 12 by inserting and tightening the auxiliary drive wheel output shaft 12, the auxiliary drive wheel output shaft 12 and the propeller are compared with the case where the propeller shaft is prevented from coming off by using a clip. The spline fitting portion with the shaft-like portion 61 of the shaft 30 can be shortened to prevent the propeller shaft 30 from coming off.

  Even when the distance between the main drive wheel output shaft 11 and the auxiliary drive wheel output shaft 12 is shortened to make the transfer device 10 compact, the shaft shape of the auxiliary drive wheel output shaft 12 and the propeller shaft 30 is reduced. Since the spline fitting part with the part 61 can be shortened, interference with the case 4 of the transmission 3 coupled to the transfer device 10 can be suppressed, and the universal joint 31 of the propeller shaft 30 can be assembled to the transfer device 10. The assembling property of the universal joint 31 of the propeller shaft 30 on the transfer device side can be ensured.

  Therefore, it is possible to secure the assembling property of the universal joint 31 of the propeller shaft 30 on the transfer device side and to prevent the propeller shaft 30 from coming off while configuring the transfer device 10 in a compact manner.

  The spline fitting between the end of the auxiliary drive wheel output shaft 12 on the propeller shaft side and the shaft-like portion 61 of the propeller shaft 30 is a press-fitting that is press-fitted by tightening the bolt member 20. This eliminates the backlash in the rotational direction at the spline fitting portion between the auxiliary drive wheel output shaft 12 and the shaft-like portion 61 of the propeller shaft 30, and the auxiliary drive wheel output shaft 12 and the shaft-like portion 61 of the propeller shaft 30. As a result, the bolt member 20 can be prevented from loosening with respect to the shaft-like portion 61 of the propeller shaft 30. It is possible to press-fit the shaft-like portion 61 of the propeller shaft 30 to the auxiliary drive wheel output shaft 12 relatively easily using the bolt member 20 without using a press-fitting device or the like.

  FIG. 5 is a cross-sectional view showing a vehicle transfer apparatus according to a second embodiment of the present invention. Since the transfer device according to the second embodiment is the same as the transfer device 10 according to the first embodiment except that the mounting structure of the propeller shaft is different, the same components are denoted by the same reference numerals and description thereof is omitted. .

  As shown in FIG. 5, the transfer device 80 according to the second embodiment also has a rear wheel output shaft 11 as a main drive wheel output shaft and an auxiliary drive wheel output shaft as in the transfer device 10. It has a front wheel output shaft 12 and a power transmission mechanism 13 for transmitting a driving force from the rear wheel output shaft 11 to the front wheel output shaft 12. The wheel output shaft 12 has an end on the front wheel output shaft 12 side. A propeller shaft 30 having a universal joint 31 is connected to the part.

  Further, the front wheel output shaft 12 is formed in a hollow shape, and a shaft-like portion 61 provided on the outer joint member 33 of the universal joint 31 of the propeller shaft 30 is splined to the front end portion of the front wheel output shaft 12 in the vehicle body. It is mated.

  The spline portion 12 a formed at the end of the front wheel output shaft 12 on the front side of the vehicle body has teeth and grooves formed in parallel to the central axis of the front wheel output shaft 12. In the transfer device 80, the spline portion 61b 'formed on the shaft-like portion 61' of the propeller shaft 30 is formed with teeth and grooves parallel to the central axis of the shaft-like portion 61 '. Spline fitting between the front end and the shaft-like portion 61 ′ of the propeller shaft 30 is non-press fitting.

  A bolt member 20 ′ is inserted into the front wheel output shaft 12 through a washer 19 from the rear end of the vehicle body into the front wheel output shaft 12. The bolt member 20 ′ also has a head portion 21 and a shaft portion 22, and the shaft portion 22 includes a distal end portion 23 having a screw portion, a proximal end portion 24 provided on the head side, and a distal end portion 23. And an intermediate portion 25 ′ provided between the base end portion 24 and the base end portion 24. In the transfer device 80, the base end portion 24 is formed with a larger diameter than the intermediate portion 25 ′, and the intermediate portion 25 ′ is formed with a smaller diameter than the distal end portion 23.

  In the transfer device 80, after the vehicle body rear side of the spline portion 61 b ′ of the shaft-like portion 61 ′ is fitted to the vehicle body front side of the spline portion 12 a of the front wheel output shaft 12, the bolt member 20 is attached to the front wheel output shaft 12. The propeller shaft is inserted into the end portion of the front wheel output shaft 12 on the front side of the vehicle body by being inserted from the end portion on the rear side of the vehicle body through the washer 19 and screwed to the shaft portion 61 of the propeller shaft 30 to be tightened. Thirty shaft-like portions 61 'are attached.

  The bolt member 20 includes the front wheel output shaft 12 in a state where the front wheel output shaft 12 is sandwiched between the end face 62 of the outer joint member 33 ′ on the vehicle body rear side and the head 21 of the bolt member 20 ′ via the washer 19. Is tightened so as to generate a predetermined axial force by pressing the end face of the rear side of the vehicle body.

  Also for the transfer device 80, the bolt member 20 ′ is inserted into the front wheel output shaft 12 from the end on the rear side of the vehicle body, and the tip 23 is screwed into the shaft-like portion 61 ′ of the propeller shaft 30 and tightened. A propeller shaft 30 is attached to the output shaft 12.

  As described above, also in the transfer device 80 according to this embodiment, the end portion on the propeller shaft side of the output shaft 12 for the auxiliary drive wheel is the shaft-like portion 61 provided on the component member 33 ′ of the universal joint 31 of the propeller shaft 30. Is inserted into the auxiliary drive wheel output shaft 12 from the end on the side opposite to the propeller shaft, and the tip portion 23 is screwed into the shaft-like portion 61 ′ of the propeller shaft 30 and tightened. A bolt member 20 ′ for attaching 30 to the auxiliary drive wheel output shaft 12 is provided.

  Thereby, it is possible to secure the assembling property of the universal joint 31 of the propeller shaft 30 on the transfer device side and to prevent the propeller shaft 30 from coming off while configuring the transfer device 80 in a compact manner.

  Further, the bolt member 20 ′ has an intermediate part 25 ′ having a smaller diameter than the tip part 23. As a result, the torsional rigidity of the intermediate portion 25 ′ of the bolt member 20 ′ is lowered, and the intermediate portion 25 ′ rotates the spline fitting portion between the auxiliary drive wheel output shaft 12 and the shaft-like portion 61 ′ of the propeller shaft 30. Since the relative rotation due to the play in the direction can be absorbed, the bolt member 20 ′ is caused by the relative rotation due to the play in the rotation direction at the spline fitting portion between the output shaft 12 for the auxiliary drive wheel and the shaft-like portion 61 ′ of the propeller shaft 30. Can be prevented from loosening with respect to the shaft-like portion 61 ′ of the propeller shaft 30.

  FIG. 6 is a cross-sectional view showing a vehicle transfer apparatus according to a third embodiment of the present invention. Since the transfer device according to the third embodiment is the same as the transfer device 10 according to the first embodiment except that the mounting structure of the propeller shaft is different, the same components are denoted by the same reference numerals and description thereof is omitted. .

  As shown in FIG. 6, the transfer device 90 according to the third embodiment also has a rear wheel output shaft 11 as a main drive wheel output shaft and an auxiliary drive wheel output shaft as in the transfer device 10. A propeller having a front wheel output shaft 12 and a power transmission mechanism 13 for transmitting a driving force from the rear wheel output shaft 11 to the front wheel output shaft 12 and having a universal joint 31 at an end on the front wheel output shaft 12 side. The shaft 30 is connected.

  Further, the front wheel output shaft 12 is formed in a hollow shape, and a shaft-like portion 61 ′ provided on the outer joint member 33 ′ of the universal joint 31 of the propeller shaft 30 at the end of the front wheel output shaft 12 on the front side of the vehicle body. Are splined.

  The spline portion 12 a formed at the end of the front wheel output shaft 12 on the front side of the vehicle body has teeth and grooves formed in parallel to the central axis of the front wheel output shaft 12. In the transfer device 90, the spline portion 61 b ′ formed on the shaft-like portion 61 ′ of the propeller shaft 30 has teeth and grooves formed in parallel to the central axis of the shaft-like portion 61 ′. Spline fitting between the front end and the shaft-like portion 61 ′ of the propeller shaft 30 is non-press fitting.

  A bolt member 20 is inserted into the front wheel output shaft 12 through a washer 19 from the end on the vehicle body rear side into the front wheel output shaft 12. In the transfer device 90, a sleeve member 91 formed in a substantially cylindrical shape is fitted inside the front wheel output shaft 12, and the bolt member 20 is inserted through the sleeve member 91. The sleeve member 91 is sandwiched between the shaft portion 61 ′ of the propeller shaft 30 and the head portion 21 of the bolt member 20 via the washer 19.

  In the transfer device 90, after the vehicle body rear side of the spline portion 61 b ′ of the shaft-shaped portion 61 ′ is fitted to the vehicle body front side of the spline portion 12 a of the front wheel output shaft 12, the sleeve member 91 is attached to the front wheel output shaft 12. The bolt member 20 is inserted from the rear end of the front wheel output shaft 12 through the washer 19 and the tip 23 is screwed into the shaft-like portion 61 ′ of the propeller shaft 30. By tightening together, the shaft-like portion 61 ′ of the propeller shaft 30 is attached to the end portion of the front wheel output shaft 12 on the vehicle body front side.

  The bolt member 20 is an end surface of the front wheel output shaft 12 on the vehicle rear side in a state where the sleeve member 91 is sandwiched between the shaft-like portion 61 ′ of the propeller shaft 30 and the head portion 21 of the bolt member 20 via the washer 19. The sleeve member 91 is tightened so as to generate a predetermined axial force by pressing the end surface of the sleeve member 91 on the vehicle body rear side without pressing.

  Also for the transfer device 90, the bolt member 20 is inserted into the front wheel output shaft 12 from the end on the rear side of the vehicle body, and the front end portion 23 is screwed into the shaft-like portion 61 ′ of the propeller shaft 30 to be tightened. A propeller shaft 30 is attached to the shaft 12.

  Thus, also in the transfer device 90 according to the present embodiment, the end portion on the propeller shaft side of the auxiliary drive wheel output shaft 12 is the shaft-like portion 61 provided on the component member 33 ′ of the universal joint 31 of the propeller shaft 30. Is inserted into the auxiliary drive wheel output shaft 12 from the end on the side opposite to the propeller shaft, and the tip portion 23 is screwed into the shaft-like portion 61 ′ of the propeller shaft 30 and tightened. A bolt member 20 for attaching 30 to the auxiliary drive wheel output shaft 12 is provided.

  Thereby, it is possible to secure the assembling property of the universal joint 31 of the propeller shaft 30 on the transfer device side and to prevent the propeller shaft 30 from coming off while configuring the transfer device 90 compactly.

  Further, the bolt member 20 is inserted into the sleeve member 91 fitted into the output shaft 12 for the auxiliary drive wheel and is fastened to the shaft-like portion 61 ′ of the propeller shaft 30, whereby the sleeve member 91 is the shaft-like portion 61 of the propeller shaft 30. And the propeller shaft 30 is attached to the output shaft 12 for auxiliary drive wheels. Thus, since the propeller shaft 30 is attached to the auxiliary drive wheel output shaft 12 in a state where the bolt member 20 is integrally assembled, the auxiliary drive wheel output shaft 12 and the shaft-like portion 61 ′ of the propeller shaft 30. It is possible to suppress the bolt member 20 from loosening with respect to the shaft-like portion 61 ′ of the propeller shaft 30 due to the relative rotation caused by the backlash in the rotational direction at the spline fitting portion.

  FIG. 7 is a cross-sectional view showing a transfer device for a vehicle according to a fourth embodiment of the present invention. The transfer device according to the fourth embodiment is configured such that a seal member is disposed between the transfer case and the spacer member in the transfer device 90 according to the third embodiment. Are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 7, also in the transfer device 100 according to the fourth embodiment, the bolt member 20 is inserted through the washer 19 from the end of the front wheel output shaft 12 on the vehicle body rear side, and the bolt member 20 is connected to the front wheel. The sleeve member 91 ′ is formed in a substantially cylindrical shape that is fitted inside the output shaft 12. The sleeve member 91 is sandwiched between the shaft portion 61 ′ of the propeller shaft 30 and the head portion 21 of the bolt member 20 via the washer 19.

  In the transfer device 100, the sleeve member 91 ′ includes an extension portion 91 a that extends toward the rear of the vehicle body from the front wheel output shaft 12, and the extension portion 91 a of the sleeve member 91 is formed to have a larger diameter than the inner diameter of the front wheel output shaft 12. Has been. In the present embodiment, a seal member 74 is disposed between the second case member 53 and the extension portion 91a of the sleeve member 91 ′ disposed on the rear side of the vehicle body from the front wheel output shaft 12.

  As described above, in the transfer device 100 according to the present embodiment, the seal member 74 is disposed between the extension 91 a of the sleeve member 91 ′ and the transfer case 51. As a result, between the auxiliary drive wheel output shaft 12 and the sleeve member 91 ′ that rotate relative to each other in the rotational direction at the spline fitting portion between the auxiliary drive wheel output shaft 12 and the shaft-like portion 61 ′ of the propeller shaft 30. Further, the lubricating oil supplied into the transfer case 51 can be supplied as indicated by an arrow A from one axial direction side of the auxiliary drive wheel output shaft 12.

  The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the scope of the present invention.

  As described above, according to the present invention, in a transfer device mounted on a four-wheel drive vehicle, the assembly of the universal joint of the propeller shaft on the transfer device side is ensured and the propeller shaft comes off while being compactly configured. Therefore, it may be suitably used in the manufacturing industry of this type of vehicle.

DESCRIPTION OF SYMBOLS 1 Four-wheel drive vehicle 3 Transmission 3a Transmission output shaft 10, 80, 90, 100 Transfer device 11 Rear wheel output shaft 12 Front wheel output shaft 13 Power transmission mechanism 20, 20 'Bolt member 21 Heads 25, 25 ′ Intermediate part 30 Propeller shaft 31 Universal joint 33, 33 ′ Outer joint member 61, 61 ′ Shaft part 71, 72, 73, 74 Seal member 91, 91 ′ Sleeve member 91 a Extension part

Claims (5)

An output shaft for main drive wheels connected to the output shaft of the transmission and extending to one side in the longitudinal direction of the vehicle body, an output shaft for auxiliary drive wheels arranged parallel to the output shaft for main drive wheels, and for the main drive wheels A power transmission mechanism for transmitting the driving force extracted from the output shaft to the auxiliary drive wheel output shaft, and extending to the other side in the vehicle longitudinal direction to the auxiliary drive wheel output shaft and the auxiliary drive wheel output A transfer device for a vehicle in which a propeller shaft having a universal joint is connected to an end on a shaft side,
The end of the auxiliary drive wheel output shaft on the side of the propeller shaft is hollow and is spline-fitted to a shaft-like portion provided on a component of a universal joint in the propeller shaft.
The propeller shaft is inserted into the auxiliary drive wheel output shaft from the end on the side opposite to the propeller shaft, and the tip is screwed into the shaft-like portion of the propeller shaft to be tightened. A bolt member to be attached is provided.
A transfer device for a vehicle. The spline fitting between the propeller shaft side end of the auxiliary drive wheel output shaft and the shaft portion of the propeller shaft is a press-fitting that is press-fitted by tightening the bolt member.
The vehicle transfer device according to claim 1. Spline fitting between the propeller shaft side end portion of the auxiliary drive wheel output shaft and the shaft portion of the propeller shaft is non-press-fit fitting,
The bolt member has an intermediate part having a smaller diameter than the tip part.
The vehicle transfer device according to claim 1. Spline fitting between the propeller shaft side end portion of the auxiliary drive wheel output shaft and the shaft portion of the propeller shaft is non-press-fit fitting,
The auxiliary drive wheel output shaft is hollow, and a sleeve member is fitted inside the auxiliary drive wheel output shaft,
The bolt member is inserted into the sleeve member from the end on the side opposite to the propeller shaft, and the tip end portion is screwed into the shaft-like portion of the propeller shaft to be tightened, so that the sleeve member becomes the shaft-like portion of the propeller shaft. And the propeller shaft is attached to the output shaft for the auxiliary drive wheel, being sandwiched between the head of the bolt member.
The vehicle transfer device according to claim 1. The sleeve member includes an extension extending in the axial direction from the auxiliary drive wheel output shaft,
A seal member is disposed between the extension portion of the sleeve member and the transfer case.
The vehicle transfer device according to claim 4.

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