JP2023063028A - Power transmission device of vehicle and assembling method of the same - Google Patents

Abstract

To provide a power transmission device of a vehicle and an assembling method of the same which can simplify a coupling structure which assembles a drive pinion gear on a propeller shaft.SOLUTION: A power transmission device 100 of a vehicle 1 comprises: a drive pinion gear 50 which has a bevel gear 512 which is arranged at an end part in a first direction at one side in a longitudinal direction, and rotates around a rotary shaft, and a hollow part 513 which is provided concentrically in the rotary shaft, and opens at an end part in a second direction at the opposite side of the first direction, where at least a portion of the hollow part 513 is a fitting hole part 514; and a propeller shaft 310 which extends concentrically toward the second direction with respect to the drive pinion gear 50, and has a fitted shaft part 311 spline-fitted to the fitting hole part 514 at the end part in the first direction. The hollow part 513 further has a storage part 540 which is arranged adjacent to the fitting hole part 514 in the first direction, and stores and accepts the fitted shaft part 311 with respect to a further movement in the first direction of the propeller shaft 310.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle power transmission device and an assembly method thereof.

A drive source such as an engine and a transmission are arranged in the front part of the vehicle body so that the output shaft extends in the front-rear direction of the vehicle body, and the driving force transmitted from the transmission is transmitted to the rear wheels via the rear-wheel output shaft extending rearward of the vehicle body. and a transfer device for extracting the driving force to be transmitted to the front wheels on the rear wheel output shaft, and the driving force extracted by the front wheel output shaft of the transfer device is transferred to the front wheel propeller shaft and the front wheel propeller shaft extending forward of the vehicle body. A so-called FR (front engine/rear drive)-based four-wheel drive vehicle is known in which power is transmitted to the front wheels via a power transmission device so that the front wheels can be driven in addition to the rear wheels.

Such a front wheel power transmission device generally consists of a front wheel differential that appropriately distributes driving force to the left and right front wheels, and a drive pinion gear that transmits the driving force of the front wheel propeller shaft to the front wheel differential. and

For example, Patent Literature 1 discloses a coupling structure in which a propeller shaft and a drive pinion gear are coupled by bolting via a companion flange.

JP 2011-179619 A

On the other hand, the coupling structure via the companion flange disclosed in Patent Document 1 has a large number of parts, so the structure is complicated and requires a lot of time for assembly. Therefore, it is desired to simplify the connecting structure between the propeller shaft and the drive pinion gear by reducing the number of parts. The same is also desired for so-called FF (front engine/front drive)-based four-wheel drive vehicles.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a power transmission device for a vehicle and a method for assembling the same that can simplify the connecting structure for assembling the drive pinion gear to the propeller shaft.

In order to solve the above problems, the present invention is characterized by the following configuration.

First, a first aspect of the present invention is a power transmission device for a vehicle,
A bevel gear arranged at an end in a first direction, which is one side in the front-rear direction, and rotating around a rotation axis along the front-rear direction, and a bevel gear provided concentrically with the rotation axis, the first direction a drive pinion gear having a hollow opening at an end in the second direction on the opposite side, wherein at least part of the hollow is a fitting hole;
a propeller shaft extending concentrically in the second direction with respect to the drive pinion gear and having a fitting shaft portion spline-fitted into the fitting hole portion at an end portion on the first direction side; with
The hollow portion is adjacent to the fitting hole portion on the first direction side and accommodates and permits the fitting shaft portion for further movement of the propeller shaft in the first direction. It further has a housing.

According to the present invention, the hollow portion of the drive pinion gear is adjacent to the fitting hole portion in the first direction and accommodates the fitting shaft portion against further movement of the propeller shaft in the first direction. It further has a receiving portion for allowing a The housing portion accommodates the propeller shaft in a state in which the fitting shaft portion of the propeller shaft is spline-fitted into the fitting hole portion of the drive pinion gear. By moving in one direction, for example, when the propeller shaft is assembled to another power transmission device such as a transfer arranged on the second direction side of the propeller shaft, the fitting shaft portion is housed in the housing portion. Thus, by moving in the first direction, the propeller shaft is separated from another power transmission device, so that the propeller shaft can be easily assembled to another power transmission device. In addition, it is possible to reduce the number of parts and simplify the coupling structure for assembling the drive pinion gear to the propeller shaft.

Further, the vehicle is a four-wheel drive vehicle,
A pair of left and right front wheel axles for rotationally driving the left and right front wheels, respectively;
A front wheel differential that distributes driving force to the pair of left and right front wheel axles and has a ring gear that meshes with the drive pinion gear may further be provided.

According to this configuration, it is possible to simplify the coupling structure for assembling the drive pinion gear to the propeller shaft, which meshes with the ring gear of the front wheel differential of the front-engine, rear-drive vehicle-based four-wheel drive vehicle.

Further, the hollow portion penetrates the drive pinion gear in the front-rear direction, and further includes a seal portion separating the hollow portion in the front-rear direction on the first direction side of the accommodating portion,
The propeller shaft may have a hole penetrating in the longitudinal direction.

According to this configuration, the hollow portion of the drive pinion gear has a sealing portion that separates the hollow portion in the front-rear direction on the first direction side of the housing portion, so that the hollow portion is configured as a sealed space on the first direction side. Even in such a case, when the fitting shaft portion of the propeller shaft is moved in the first direction so as to be housed in the housing portion, the air inside the hollow portion is released to the outside through the hole of the propeller shaft. This facilitates movement of the propeller shaft in the first direction. Further, the propeller shaft is restricted from further movement in the first direction by coming into contact with the seal portion. Furthermore, when the propeller shaft is moved in the second direction, the air moves from the second direction side of the propeller shaft into the hollow portion through the hole, which facilitates the movement of the propeller shaft in the second direction.

The propeller shaft further has a pair of centering shaft portions provided on both sides of the fitting shaft portion in the front-rear direction,
The hollow portion may be provided on both sides of the fitting hole portion in the front-rear direction, and may further have a pair of centering hole portions that are fitted to the pair of centering shaft portions.

According to this configuration, the propeller shaft is centered on the drive pinion gear by fitting the centering shafts into the centering holes. Therefore, deflection of the propeller shaft with respect to the drive pinion gear is suppressed.

Further, the propeller shaft is a first propeller shaft,
The hollow portion is a first hollow portion,
The fitting hole is a first fitting hole,
a transfer having, on the second direction side of the first propeller shaft, a first output portion for outputting in the first direction part of the power transmitted in the second direction;
It extends in the front-rear direction, the end on the second direction side is connected to the first output portion, and the joint portion, which is the end on the first direction side, is connected to the first propeller shaft. , the joint portion has a second hollow portion opened in the first direction, and at least part of the second hollow portion is an end portion of the first propeller shaft on the second direction side; a second propeller shaft, which is a second fitting hole spline-fitted to the end of the propeller shaft;
The second end of the first propeller shaft may further include a C-ring fixed to the second fitting hole in the front-rear direction.

According to this configuration, when the drive pinion gear, the first propeller shaft, and the second propeller shaft are assembled, the fitting shaft portion of the first propeller shaft is spline-fitted into the first fitting hole portion of the drive pinion gear. With the first propeller shaft moved in the first direction so that the fitting shaft portion of the first propeller shaft is housed in the housing portion, the second end portion of the first propeller shaft is fitted into the second fitting portion of the second propeller shaft. The second end of the first propeller shaft can be easily inserted into the mating hole, and the C-ring fixes the second end of the first propeller shaft to the second fitting hole of the second propeller shaft.

Further, the second fitting hole is
a circumferential groove in which the C ring is fitted;
and an inner diameter that decreases toward the second direction.

According to this configuration, the second fitting hole of the second propeller shaft has an inner diameter that decreases toward the second direction, so that the drive pinion gear, the first propeller shaft, and the second propeller shaft are assembled. When the second end of the first propeller shaft is inserted into the second fitting hole of the second propeller shaft, the outer diameter of the C-ring is gradually reduced and fitted into the circumferential groove. Therefore, the second end of the first propeller shaft can be more easily inserted into the second fitting hole of the second propeller shaft.

In addition, the joint portion spline-fits the second end portion of the first propeller shaft into the second fitting hole portion of the second propeller shaft on the outer circumference on the first direction side, and then the jig is mounted. has a joint-side circumferential groove that engages with and fixes the second propeller shaft,
The second end portion of the first propeller shaft is configured to fit the second end portion of the first propeller shaft to the second fitting hole of the second propeller shaft on the outer circumference on the first direction side of the C-ring. After spline fitting to the part, engaging with the jig, the second end of the first propeller shaft is inserted into the second fitting hole of the second propeller shaft. It may have a first propeller shaft side circumferential groove for moving the first propeller shaft in the second direction.

According to this configuration, in order to assemble the drive pinion gear, the first propeller shaft, and the second propeller shaft, the second propeller shaft is fixed and the first propeller shaft is fixed by engaging the joint-side circumferential groove with the jig. By engaging the side circumferential groove with the jig and moving the first propeller shaft toward the second propeller shaft, the second end of the first propeller shaft fits into the second fitting hole of the second propeller shaft. is inserted into Therefore, it is possible to easily assemble the drive pinion gear, the first propeller shaft, and the second propeller shaft. The second end of the first propeller shaft is easily fixed to the second fitting hole of the second propeller shaft by the C-ring.

In a second aspect of the present invention, a cylindrical first shaft portion extending in the front-rear direction and a first shaft portion disposed at one end in the first direction, which is one side of the first shaft portion in the front-rear direction, are provided. 1 bevel gear, and a first hollow portion penetrating at least the first shaft portion in the front-rear direction, at least a portion of the first hollow portion being a fitting hole portion;
It extends coaxially with respect to the drive pinion gear in the second direction opposite to the first direction, and the fitting shaft portion spline-fitted into the fitting hole portion is arranged on the first direction side. a first propeller shaft having a first end, which is an end;
a second propeller shaft extending in the front-rear direction behind the first propeller shaft, the end on the first direction side being spline-fitted to the end on the second direction side of the first propeller shaft; and
The first hollow portion is adjacent to the fitting hole portion in the first direction and accommodates the fitting shaft portion against further movement of the first propeller shaft in the first direction. A method for assembling a power transmission device for a vehicle, further comprising a housing portion that allows
By moving the first propeller shaft in the first direction with respect to the drive pinion gear, the fitting shaft portion is spline-fitted into the fitting hole portion;
further moving the first propeller shaft in the first direction to accommodate the fitting shaft portion in the accommodating portion;
aligning a second end of the first propeller shaft on the second direction side and the second propeller shaft in a concentric manner;
By moving the first propeller shaft in the second direction, the fitting shaft is fitted into the fitting hole and the first propeller shaft and the second propeller shaft are spline fitted. .

According to the present invention, in order to assemble the drive pinion gear, the first propeller shaft, and the second propeller shaft, the first propeller shaft is moved in the first direction with respect to the drive pinion gear so that the fitting shaft portion is moved to the fitting hole portion. The first propeller shaft is further moved in the first direction to accommodate the fitting shaft portion in the accommodation portion, and the second end portion, which is the end portion on the second direction side of the first propeller shaft and the second propeller shaft are concentrically aligned, and the first propeller shaft is moved in the second direction to fit the fitting shaft portion into the fitting hole portion, and the first propeller shaft and the second propeller shaft are fitted together. 2 Spline fit the propeller shaft. Therefore, the first propeller shaft is moved in the first direction so that the fitting shaft is accommodated in the accommodating portion, thereby separating the second end from the second propeller shaft. Easy spline fit with shaft. Also, the simplified coupling structure reduces the number of parts and facilitates assembly of the drive pinion gear, the first propeller shaft, and the second propeller shaft.

Therefore, according to the vehicle power transmission device and the method for assembling the same according to the present invention, the connecting structure for assembling the drive pinion gear to the propeller shaft can be simplified.

1 is a schematic diagram showing a vehicle power transmission device according to an embodiment of the present invention; FIG. FIG. 2 is a sectional view showing the power transmission device of FIG. 1; FIG. 3 is a cross-sectional view of the fitting shaft portion of the power transmission device along the line III-III of FIG. 2; FIG. 3 is a cross-sectional view of the centering hole of the power transmission device taken along line IV-IV of FIG. 2; 3 is a cross-sectional view showing a state in which the fitting shaft portion of the first propeller shaft of the power transmission device of FIG. 2 is moved in the first direction and accommodated in the accommodation portion; FIG. 3 is a schematic view showing a jig for assembling the first propeller shaft of the power transmission device of FIG. 2 to the second propeller shaft; FIG. FIG. 7 is a cross-sectional view showing a method of assembling the first propeller shaft to the second propeller shaft using the jig of FIG. 6; FIG. 7 is a cross-sectional view showing a method of assembling the first propeller shaft to the second propeller shaft using the jig of FIG. 6; FIG. 5 is a schematic diagram showing a power transmission device for a vehicle according to a modified example of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[Power transmission device]
FIG. 1 is a schematic diagram showing a vehicle power transmission device according to an embodiment of the present invention. As shown in FIG. 1, a vehicle 1 equipped with a power transmission device 100 according to an embodiment of the present invention is a four-wheel drive vehicle based on a front-engine, rear-drive vehicle, and an engine as a drive source is mounted in front of the vehicle body. 2 and a transmission 3 are arranged so that their shaft centers extend in the longitudinal direction of the vehicle body.

In the vehicle body rearward (second direction) of the transmission 3, the driving force from the engine 2 transmitted from the transmission 3 is transmitted to the rear via a rear wheel propeller shaft 5 extending rearward of the vehicle body and a rear wheel differential 6. A transfer device 10 is provided for taking out the driving force to be transmitted to the wheels 7 and to be transmitted to the front wheels 8 .

The transfer device 10 includes a rear wheel output shaft 11 connected to the output shaft 4 of the transmission 3 and extending rearward of the vehicle body, and a front wheel output shaft (first output portion) arranged parallel to the rear wheel output shaft 11. 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 .

The transfer device 10 also has a coupling 16 which is provided on the output shaft 4 and distributes the driving force transmitted from the output shaft 4 to the rear wheel output shaft 11 and the front wheel output shaft 12 appropriately. . As the coupling 16, an electromagnetic coupling or the like is used.

The power transmission mechanism 13 is of a gear type, and includes a drive gear 14 provided on the vehicle body front (first direction) side of the coupling 16 on the rear wheel output shaft 11 and connected to the coupling 16, and the front wheels. and a driven gear 15 provided on the output shaft 12 for the front wheels and connected to the output shaft 12 for the front wheels and meshing with the drive gear 14, and the driving force for the front wheels 8 taken out from the output shaft 11 for the rear wheels by the coupling 16 is supplied to the drive gear 15. It is configured to transmit to the front wheel output shaft 12 .

A front-wheel propeller shaft 30 extending toward the front side of the vehicle body is connected to the front-wheel output shaft 12 at its end on the front side of the vehicle body. The front wheel propeller shaft 30 has a universal joint 31 at the rear end 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 includes a first propeller shaft 310 arranged on the front side of the vehicle body, which will be described later, and a second propeller shaft 360 arranged on the rear side of the vehicle body from the first propeller shaft 310 and having the universal joint 32 . Prepare. The first propeller shaft 310 is spline-fitted to the second propeller shaft 360 via the universal joint 32, and spline-fitted to the drive pinion gear 50 of the front wheel differential 40, which will be described later. The drive pinion gear 50 of the front wheel differential 40 is connected to axles 42 that are connected to the left and right front wheels 8 in the width direction of the vehicle body.

As a result, the driving force for the front wheels 8 is transmitted to the front wheel output shaft 12 via the power transmission mechanism 13 , and the front wheel 8 is transmitted from the front wheel output shaft 12 via the front wheel propeller shaft 30 and the front wheel differential 40 . is transmitted to

In the vehicle 1, the coupling 16 extracts driving force for the front wheels 8 by varying the torque distribution between the front wheels 8 and the rear wheels 7 in the range of front wheels:rear wheels=0:100 to 50:50. there is The operation of the coupling 16 is controlled by a control unit (not shown).

Next, the power transmission device 100 will be described in more detail with reference to FIG.

FIG. 2 is a cross-sectional view showing the power transmission device 100 of FIG. As shown in FIG. 2 , the front wheel differential 40 is housed in a case 200 . The case 200 includes a first case member 201 and a second case member 202 arranged in order from the front side of the vehicle body. The first case member 201 and the second case member 202 are fastened and fixed using fastening bolts 203 .

A front wheel differential 40 is rotatably supported in the case 200, as shown in FIG.

A front wheel differential 40 is arranged between the right lateral wall portion 211 and the left lateral wall portion 212 of the first case member 201 .

The front wheel differential 40 includes a ring gear 410 made of carbon steel on the left side in the vehicle width direction, and a differential case 420 made of cast iron on the right side in the vehicle width direction. Ring gear 410 has a cylindrical ring gear shaft portion 411 extending in the left-right direction, and a ring bevel gear 412 arranged at the right end portion of ring gear shaft portion 411 in the width direction of the vehicle body. On the other hand, the differential case 420 includes a substantially cylindrical differential case shaft portion 421 having an outer diameter equal to the inner circumference of the ring gear shaft portion 411 so as to fit with the ring gear shaft portion 411 of the ring gear 410, and a differential case shaft portion 421. and a substantially spherical inner space 422 formed inside 421 . A substantially circular flange 423 is provided on the left side of the differential case shaft portion 421 of the differential case 420 in the vehicle width direction. Ring gear 410 and differential case 420 are fastened and fixed using fastening bolts 425 and 426 attached to flange 423 .

Further, a pinion shaft 431 is attached to the differential case 420 so as to pass through the internal space 422 and extend in a direction perpendicular to the central axis 430 of the differential case shaft portion 421 . A first differential pinion gear 432 arranged on the vehicle front side and a differential second pinion gear 433 arranged on the vehicle rear side are connected to the pinion shaft 431 in an internal space 422 . there is Further, in the internal space 422, along the central axis 430 of the differential case shaft portion 421, a third differential pinion gear 434 is arranged on the right side in the vehicle width direction, and a fourth differential pinion gear 435 is arranged. It is located on the left side in the vehicle width direction. The third differential pinion gear 434 and the fourth differential pinion gear 435 are respectively connected to the axle 42, and mesh with the first differential pinion gear 432 and the second differential pinion gear 433. , according to the motion of the vehicle 1, the difference in rotational speed between the left and right front wheels in the width direction of the vehicle body can be adjusted appropriately.

The differential case 420 includes a bearing 440 disposed between the right outer peripheral surface of the differential case shaft portion 421 in the vehicle width direction and the first case member 201, the left outer peripheral surface of the differential case shaft portion 421 in the vehicle width direction, and the first case member 201. It is rotatably supported by the case 200 via a bearing 441 arranged between the case member 201 and the case member 201 .

As shown in FIG. 1, a drive pinion gear 50 connected to a front wheel differential 40 is rotatably supported within case 200 .

Drive pinion gear 50 made of carbon steel is disposed between right lateral wall portion 213 and left lateral wall portion 214 of second case member 202 in case 200 .

The drive pinion gear 50 includes a cylindrical drive pinion gear shaft portion 511 extending in the longitudinal direction of the vehicle body, a drive pinion bevel gear 512 arranged at the end portion on the front side of the vehicle body with respect to the drive pinion gear shaft portion 511 , and the drive pinion gear shaft portion 511 . and a first hollow portion 513 penetrating in the longitudinal direction of the vehicle body. A first fitting hole portion 514 configured to be spline-fitted to a first propeller shaft 310 (to be described later) is provided on the rear side of the vehicle body of the first hollow portion 513 .

Drive pinion gear 50 is rotatably supported by case 200 via a bearing 550 arranged between the outer peripheral surface of drive pinion gear shaft portion 511 and second case member 202 .

Drive pinion gear 50 and ring gear 410 are configured to transmit driving force from front wheel propeller shaft 30 to front wheel differential 40 by meshing drive pinion bevel gear 512 and ring bevel gear 412 .

The front wheel propeller shaft 30 includes a first propeller shaft 310 arranged on the front side of the vehicle body, and a second propeller shaft 360 arranged on the rear side of the vehicle body from the first propeller shaft 310 and having the universal joint 32 .

The first propeller shaft 310 is connected to the drive pinion gear 50 and extends concentrically with the drive pinion gear 50 rearward of the vehicle body. The first propeller shaft 310 has a fitting shaft portion 311 spline-fitted into the first fitting hole portion 514 at a first end portion 312 that is the end portion on the front side of the vehicle body.

The second propeller shaft 360 includes a joint portion 361 that is arranged on the front side of the vehicle body relative to the universal joint 32 and connected to the first propeller shaft 310 . The joint portion 361 has a second hollow portion 362 that opens toward the front side of the vehicle body. A second fitting hole portion 363 configured to be spline-fitted to the second end portion 313 of the first propeller shaft 310 on the vehicle rear side is provided on the vehicle front side of the second hollow portion 362 . is provided.

The first propeller shaft 310 has a pair of centering shaft portions 320 and 321 provided on both sides of the fitting shaft portion 311 in the longitudinal direction of the vehicle body. On the other hand, the first hollow portion 513 of the drive pinion gear 50 is provided on both sides of the first fitting hole portion 514 in the longitudinal direction of the vehicle body, and is a pair of centering holes fitted to the pair of centering shaft portions 320 and 321 respectively. It has parts 520 and 521 .

3 is a cross-sectional view of the fitting shaft portion 311 of the power transmission device 100 along line III-III in FIG. As shown in FIG. 3 , a plurality of fitting shaft side teeth 330 are provided on the outer periphery of the fitting shaft portion 311 of the first propeller shaft 310 over the entire circumference. On the other hand, the inner periphery of the first fitting hole portion 514 of the drive pinion gear 50 is spline-fitted to the fitting shaft portion side teeth 330 of the fitting shaft portion 311 of the first propeller shaft 310 . A plurality of fitting hole side teeth 530 are provided over the entire circumference.

The fitting shaft portion 311 of the first propeller shaft 310 includes a fitting shaft portion side tooth tip surface 331 provided at the radially outer end portion of the fitting shaft portion side tooth 330 and a fitting shaft portion side tooth 330 . It has a fitting shaft portion side tooth bottom surface 332 provided on the outer peripheral surface between. On the other hand, the first fitting hole portion 514 of the drive pinion gear 50 includes a fitting hole portion side tooth crest surface 531 provided at the radially inner end portion of the fitting hole portion side tooth 530 and a fitting hole portion side and a fitting hole side tooth bottom surface 532 provided on the inner peripheral surface between the teeth 530 .

As shown in FIG. 3 , the fitting shaft portion side teeth 330 of the first propeller shaft 310 are positioned between the fitting hole portion side teeth 530 of the drive pinion gear 50 in the circumferential direction, respectively. A fitting shaft portion 311 of the shaft 310 is configured to be spline-fitted into a first fitting hole portion 514 of the drive pinion gear 50 . At this time, a gap is provided between the fitting shaft portion side tooth top surface 331 of the first propeller shaft 310 and the fitting hole portion side tooth bottom surface 532 of the drive pinion gear 50 .

FIG. 4 is a cross-sectional view of centering hole 520 of power transmission device 100 taken along line IV-IV of FIG. As shown in FIG. 4, on the inner periphery of the centering hole portion 520 of the drive pinion gear 510, the fitting hole portion side teeth 530 of the first fitting hole portion 514 are provided along the entire circumference extending in the longitudinal direction of the vehicle body. . On the other hand, the centering shaft portion 320 of the first propeller shaft 310 has the same inner diameter as the tooth top surface 531 on the fitting hole side of the first fitting hole portion 514 . In other words, the centering shaft portion 320 is formed to have an outer diameter that is larger than the fitting shaft portion side tooth bottom surface 332 and smaller than the fitting shaft portion side tooth top surface 331 . Although not shown, the centering shaft portion 321 and the centering hole portion 521 are similarly configured.

Therefore, when fitting shaft portion 311 of first propeller shaft 310 is spline-fitted into first fitting hole portion 514 of drive pinion gear 50 , centering shaft portions 320 and 321 of first propeller shaft 310 are aligned with drive pinion gear 50 . By being fitted into the centering holes 520 and 521 , the first propeller shaft 310 is concentrically centered with respect to the drive pinion gear 50 and supported.

Returning to FIG. 2, the first hollow portion 513 of the drive pinion gear 50 is adjacent to the first fitting hole portion 514 on the front side of the vehicle body, and is used to move the first propeller shaft 310 to the front side of the vehicle body, which will be described later. On the other hand, a housing portion 540 that houses and permits the fitting shaft portion 311 and a seal portion 541 that separates the first hollow portion 513 in the longitudinal direction of the vehicle body from the housing portion 540 on the front side of the vehicle body are provided. The inner diameter of the accommodating portion 540 is larger than the outer shape of the fitting shaft portion 311 (fitting shaft portion side tooth top surface 331).

The first propeller shaft 310 has a hole portion 340 penetrating in the longitudinal direction of the vehicle body.

FIG. 5 is a cross-sectional view showing a state in which fitting shaft portion 311 of first propeller shaft 310 of power transmission device 100 of FIG.

As shown in FIG. 5 , the first propeller shaft 310 moves forward from the state in which the fitting shaft portion 311 is spline-fitted into the first fitting hole portion 514 of the drive pinion gear 50 . , and the fitting shaft portion 311 is accommodated in the accommodation portion 540 . Further, the first propeller shaft 310 is configured such that the first end 312 abuts against the seal portion 541 from the rear side of the vehicle body, thereby restricting further movement to the front side of the vehicle body.

When the first end portion 312 of the first propeller shaft 310 abuts against the seal portion 541 from the rear side of the vehicle body, the hole portion 340 allows the air contained inside the first hollow portion 513 of the drive pinion gear 50 and the housing portion 540 to flow into the vehicle body. It is configured to be released rearward.

Returning to FIG. 2, the first propeller shaft 310 has a second end 313 fixed to a second fitting hole 363 of the second propeller shaft 360 in the longitudinal direction. A ring 350 is provided. On the other hand, the second fitting hole portion 363 of the second propeller shaft 360 has a circumferential groove 370 to which the C-ring 350 is fitted and an inner diameter that decreases toward the rear side of the vehicle body. The C-ring 350 has a second fitting hole portion 363 of the second propeller shaft 360 that has an inner diameter that decreases toward the rear side of the vehicle body when the second fitting hole portion 363 of the second propeller shaft 360 is inserted into the second end portion 313 of the first propeller shaft 310 . By being urged radially inward by the mating hole portion 363 , the outer diameter is gradually reduced to fit into the circumferential groove 370 . Therefore, first propeller shaft 310 is fixed to second propeller shaft 360 in the longitudinal direction by fitting C ring 350 into circumferential groove 370 .

A joint-side circumferential groove 371 is provided on the outer circumference of the joint portion 361 of the second propeller shaft 360 on the front side of the vehicle body. On the other hand, a first propeller shaft side circumferential groove 351 is provided on the outer circumference of the second end portion 313 of the first propeller shaft 310 on the front side of the vehicle body with respect to the C ring 350 . More specifically, the first propeller shaft side circumferential groove 351 is located on the front side of the vehicle body with respect to the joint portion 361 when the first propeller shaft 310 is assembled to the second propeller shaft 360 . The joint-side circumferential groove 371 and the first propeller shaft-side circumferential groove 351 are used to assemble the second end portion 313 of the first propeller shaft 310 into the second fitting hole portion 363 of the second propeller shaft 360. configured to engage with the

[jig]
FIG. 6 is a schematic diagram showing a jig 600 for assembling first propeller shaft 310 to second propeller shaft 360 of power transmission device 100 of FIG.

The jig 600 has a pair of handles 610 and 621 that are gripped by an operator or machine when assembling the second end portion 313 of the first propeller shaft 310 to the joint portion 361 of the second propeller shaft 360 . In this embodiment, the handle 610 extends in the direction of the axis 611, and is gripped with one end directed leftward in the width direction of the vehicle body during use. A positioning support 613 extending along an orthogonal direction 612 perpendicular to the shaft 611 is fixed to the other end of the handle 610 . A positioning portion 614 extending in the direction of the shaft 611 is fixed to one end side of the positioning support portion 613 in the orthogonal direction 612 . A positioning opening 615 is provided at the other end of the positioning portion 614 in the direction of the shaft 611 . The positioning opening 615 is formed in a semicircular shape when viewed from the orthogonal direction 612 so as to engage with the joint-side circumferential groove 371 of the second propeller shaft 360 .

An arm 620 extending in the direction of the shaft 611 is attached to the other end of the positioning support 613 in the orthogonal direction 612 . The arm 620 is configured to be rotatable around an arm rotation shaft 630 fixed to the other end of the positioning support 613 in the orthogonal direction 612 .

A pair of handles 621 to be gripped by an operator when assembling the second end portion 313 of the first propeller shaft 310 to the joint portion 361 of the second propeller shaft 360 is provided on one end side of the arm 620 . A first bent portion 623 that is bent with respect to the handle 621 is provided on the other end side of the handle 621 of the arm 620 . An arm rotating portion 624 extending in the direction of the arm rotating shaft 630 is provided on the other end side of the first bent portion 623 . An arm opening 625 is provided on the other end side of the arm rotating portion 624 , the other end side in the direction of the arm rotating shaft 630 being open. The other end of arm opening 625 is connected to arm rotation axis 630 so that arm 620 can rotate around arm rotation axis 630 . A second bent portion 626 that is bent with respect to the arm opening 625 is provided on the other end side of the arm opening 625 . A pair of arm engaging portions 627 and 628 extending in the direction of the arm rotating shaft 630 are provided on the other end side of the second bent portion 626 . The arm engaging portions 627 and 628 are formed to engage with the first propeller shaft side circumferential groove 351 of the first propeller shaft 310 .

[Assembly method of power transmission device]
A method of assembling the power transmission device 100 for the vehicle 1 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

Returning to FIG. 5 , the first propeller shaft 310 is moved to the front side of the vehicle body with respect to the drive pinion gear 50 , so that the fitting shaft portion 311 is previously spline-fitted into the first fitting hole portion 514 . At this time, the centering shaft portions 320 and 321 of the first propeller shaft 310 are fitted into the centering holes 520 and 521 of the drive pinion gear 50 , so that the first propeller shaft 310 is concentrically centered with respect to the drive pinion gear 50 . supported by

After that, the first propeller shaft 310 moves further toward the front side of the vehicle body, so that the fitting shaft portion 311 is housed in the housing portion 540 so that the first end portion 312 contacts the seal portion 541 from the rear side of the vehicle body. be. At this time, air contained inside first hollow portion 513 and housing portion 540 of drive pinion gear 50 is discharged to the rear side of the vehicle body through hole portion 340 of first propeller shaft 310 . Further, since the first propeller shaft 310 is arranged in a state of being moved to the front side of the vehicle body, the second end portion 313 is separated from the second fitting hole portion 363 of the second propeller shaft 360. The process of assembling the first propeller shaft 310 to the second propeller shaft 360 is easily performed.

After that, as shown in FIG. 2, the second propeller shaft 360 and the second end 313, which is the end of the first propeller shaft 310 on the rear side of the vehicle body, are aligned concentrically, and the first propeller shaft 310 is moved. By moving to the rear side of the vehicle body, the fitting shaft portion 311 is fitted into the first fitting hole portion 514 of the drive pinion gear 50, and the second end portion 313 and the second fitting hole portion of the second propeller shaft 360 are fitted. 363 are spline-fitted.

7 and 8 are cross-sectional views showing how to assemble the first propeller shaft 310 to the second propeller shaft 360 using the jig 600 of FIG.

As shown in FIG. 7, the positioning opening 615 of the jig 600 engages the joint-side circumferential groove 371 of the second propeller shaft 360, and the arm engaging portions 627, 628 engage the first propeller of the first propeller shaft 310. A jig 600 is arranged so as to engage with the shaft-side circumferential groove 351 . The second propeller shaft 360 is fixed by engaging the joint-side circumferential groove 371 with the positioning opening 615 of the jig 600 .

Thereafter, as shown in FIG. 8 , by rotating the arm 620 of the jig 600 toward the front side of the vehicle body around the arm rotation axis 630 , the arm engaging portions 627 and 628 are engaged with the first propeller of the first propeller shaft 310 . While engaged with the shaft-side circumferential groove 351 , the first propeller shaft 310 moves toward the second propeller shaft 360 so that the second end 313 of the first propeller shaft 310 engages with the second propeller shaft 360 of the second propeller shaft 360 . It is further inserted into the fitting hole portion 363 .

At this time, the C ring 350 has an inner diameter that decreases toward the rear side of the vehicle body as the second end portion 313 of the first propeller shaft 310 is inserted into the second fitting hole portion 363 of the second propeller shaft 360. By being biased radially inward by the second fitting hole portion 363 , the outer diameter is gradually reduced and fitted into the circumferential groove 370 . Also, when the C ring 350 is fitted into the circumferential groove 370 , the first propeller shaft 310 is fixed to the second propeller shaft 360 in the longitudinal direction.

As described above, the power transmission device 100 of the vehicle 1 according to the embodiment of the present invention includes the drive pinion bevel gear 512 which is arranged at the front end of the vehicle body and rotates around the rotation axis extending in the front-rear direction, and the rotation axis. It has a first hollow portion 513 that is concentrically provided in the body and opens at the end on the rear side of the vehicle body, and at least a part of the first hollow portion 513 is the first fitting hole portion 514. The drive pinion gear 50 and the fitting shaft portion 311 extending concentrically to the rear side of the vehicle body with respect to the drive pinion gear 50 and spline-fitted into the first fitting hole portion 514 are the ends on the front side of the vehicle body. and a first propeller shaft 310 having a first end 312 . In addition, the first hollow portion 513 is adjacent to the first fitting hole portion 514 on the front side of the vehicle body, and the fitting shaft portion 311 is positioned against the further movement of the first propeller shaft 310 toward the front side of the vehicle body. It further has a receiving portion 540 for receiving and allowing.

In a state where the fitting shaft portion 311 of the first propeller shaft 310 is spline-fitted into the first fitting hole portion 514 of the drive pinion gear 50 by the accommodating portion 540, the fitting shaft portion 311 of the first propeller shaft 310 is fitted. By moving the first propeller shaft 310 to the front side of the vehicle body so as to be accommodated in the accommodation portion 540, the first propeller shaft 360 is arranged on the rear side of the vehicle body relative to the first propeller shaft 310. When the first propeller shaft 310 is assembled, the first propeller shaft 310 is separated from the second propeller shaft 360 by moving forward in the vehicle body so that the fitting shaft portion 311 is accommodated in the accommodation portion 540 . Shaft 310 can be easily assembled to second propeller shaft 360 . In addition, the connecting structure for assembling drive pinion gear 50 to first propeller shaft 310 can be simplified by reducing the number of parts.

In addition, it is possible to simplify the coupling structure for assembling the drive pinion gear 50 to the first propeller shaft 310, which meshes with the ring gear 410 of the front wheel differential 40 of the four-wheel drive vehicle based on the front engine/rear drive vehicle.

In addition, since the first hollow portion 513 of the drive pinion gear 50 has a sealing portion 541 that separates the first hollow portion 513 in the front-rear direction from the accommodating portion 540 on the front side of the vehicle body, the first hollow portion 513 is located on the front side of the vehicle body. Even in the case where the space is sealed, when the fitting shaft portion 311 of the first propeller shaft 310 is moved to the front side of the vehicle body so as to be housed in the housing portion 540, the air inside the first hollow portion 513 is removed. is emitted to the outside through the hole 340 of the first propeller shaft 310 . This makes it easy to move the first propeller shaft 310 toward the front side of the vehicle body. In addition, further movement to the front side of the vehicle body is restricted by abutting the first propeller shaft 310 on the seal portion 541 . Furthermore, when the first propeller shaft 310 is moved to the rear side of the vehicle body, the air moves from the second propeller shaft 360 on the second direction side of the first propeller shaft 310 to the inside of the first hollow portion 513 through the hole portion 340. , the first propeller shaft 310 can be easily moved to the rear side of the vehicle body.

First propeller shaft 310 is centered on drive pinion gear 50 by fitting centering shafts 320 and 321 into centering holes 520 and 521, respectively. Therefore, deflection of first propeller shaft 310 with respect to drive pinion gear 50 is suppressed.

When drive pinion gear 50 , first propeller shaft 310 and second propeller shaft 360 are assembled, fitting shaft portion 311 of first propeller shaft 310 is spline-fitted into first fitting hole portion 514 of drive pinion gear 50 . Then, in a state in which the first propeller shaft 310 is moved forward of the vehicle body so that the fitting shaft portion 311 of the first propeller shaft 310 is accommodated in the accommodation portion 540, the second end portion 313 of the first propeller shaft 310 is moved. It can be easily inserted into the second fitting hole portion 363 of the second propeller shaft 360 , and the C-ring 350 allows the second end portion 313 of the first propeller shaft 310 to be inserted into the second fitting hole portion 363 of the second propeller shaft 360 . fixed to

In addition, the second fitting hole portion 363 of the second propeller shaft 360 has an inner diameter that decreases toward the rear side of the vehicle body. When the second end portion 313 of the first propeller shaft 310 is inserted into the second fitting hole portion 363 of the second propeller shaft 360 , the outer diameter of the C-ring 350 gradually decreases to fit into the circumferential groove 370 . be worn. Therefore, the second end 313 of the first propeller shaft 310 can be more easily inserted into the second fitting hole 363 of the second propeller shaft 360 .

Further, in order to assemble the drive pinion gear 50, the first propeller shaft 310 and the second propeller shaft 360, by engaging the joint side circumferential groove 371 with the jig 600, the second propeller shaft 360 is fixed and the first propeller shaft 360 is fixed. By engaging the propeller shaft side circumferential groove 351 with the jig 600 and moving the first propeller shaft 310 toward the second propeller shaft 360, the second end portion 313 of the first propeller shaft 310 moves toward the second propeller shaft. It is inserted into the second fitting hole portion 363 of the shaft 360 . Therefore, drive pinion gear 50, first propeller shaft 310, and second propeller shaft 360 can be easily assembled. Second end 313 of first propeller shaft 310 is easily fixed to second fitting hole 363 of second propeller shaft 360 by C ring 350 .

Further, in order to assemble the drive pinion gear 50, the first propeller shaft 310 and the second propeller shaft 360, the first propeller shaft 310 is moved to the front side of the vehicle body with respect to the drive pinion gear 50, thereby moving the fitting shaft portion 311 to the first position. The fitting hole portion 514 is spline-fitted, the first propeller shaft 310 is further moved to the front side of the vehicle body, the fitting shaft portion 311 is accommodated in the accommodation portion 540, and the rear side of the vehicle body of the first propeller shaft 310 is accommodated. By aligning the second end portion 313 and the second propeller shaft 360 concentrically and moving the first propeller shaft 310 toward the rear side of the vehicle body, the fitting shaft portion 311 is moved to the first fitting position. The first propeller shaft 310 and the second propeller shaft 360 are spline-fitted together while being fitted into the hole 514 . Therefore, the first propeller shaft 310 moves toward the front side of the vehicle body so that the fitting shaft portion 311 is accommodated in the accommodation portion 540 , thereby separating the second end portion 313 from the second propeller shaft 360 . Therefore, it can be easily spline-fitted with the second propeller shaft 360 . In addition, the simplified coupling structure allows the drive pinion gear 50, the first propeller shaft 310, and the second propeller shaft 360 to be easily assembled with a reduced number of parts.

[Other Modifications]
FIG. 9 is a schematic diagram showing a vehicle power transmission device according to a modification of the present invention. A vehicle 700 shown in FIG. 9 is a so-called FF (front engine/front drive)-based four-wheel drive vehicle having left and right front wheels 702 as main drive wheels and left and right rear wheels 704 as auxiliary drive wheels. . The front wheels 702 are connected to an engine 706 via front wheel drive shafts 721 and 722, a front wheel differential 710, a transmission, and the like. ) power transmission system is configured. On the other hand, the rear wheel 704 includes rear wheel drive shafts 731 and 732, a rear wheel differential 770, a coupling 760, a propeller shaft 750, a transfer device 740, a differential case 712 of the front wheel differential 710, a transmission, and the like. It is connected to the engine 706 via.

The transfer device 740 includes an input shaft 741 extending in the width direction of the vehicle body, an output shaft 742 extending in the longitudinal direction of the vehicle body, a drive gear 743 provided on the input shaft 741, and a driven gear 744 provided on the output shaft 742 and meshing with the drive gear 743. , and a transfer case 748 that accommodates a portion of the input shaft 741, a portion of the output shaft 742, the drive gear 743, the driven gear 744, and the like. A coupling structure for assembling the drive pinion gear provided by the present invention to the propeller shaft may be applied to the output shaft 742 .

The present invention is not limited to the illustrated embodiments, and various improvements and design changes are possible without departing from the gist of the invention.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to simplify the connecting structure for assembling the drive pinion gear to the propeller shaft in the power transmission device of a vehicle. be.

1 vehicle 50 drive pinion gear 100 power transmission device 310 first propeller shaft 311 fitting shaft portion 312 first end portion 512 drive pinion bevel gear 513 first hollow portion 514 first fitting hole portion 540 accommodation portion

Claims (8)

A bevel gear arranged at an end in a first direction, which is one side in the front-rear direction, and rotating around a rotation axis along the front-rear direction, and a bevel gear provided concentrically with the rotation axis, the first direction a drive pinion gear having a hollow opening at an end in the second direction on the opposite side, wherein at least part of the hollow is a fitting hole;
a propeller shaft extending concentrically in the second direction with respect to the drive pinion gear and having a fitting shaft portion spline-fitted into the fitting hole portion at an end portion on the first direction side; with
The hollow portion is adjacent to the fitting hole portion on the first direction side and accommodates and permits the fitting shaft portion for further movement of the propeller shaft in the first direction. A power transmission device for a vehicle, further comprising a housing. The vehicle is a four-wheel drive vehicle,
A pair of left and right front wheel axles for rotationally driving the left and right front wheels, respectively;
a front wheel differential that distributes driving force to the pair of left and right front wheel axles and has a ring gear that meshes with the drive pinion gear;
The vehicle power transmission device according to claim 1 . The hollow portion penetrates the drive pinion gear in the front-rear direction, and further has a seal portion that separates the hollow portion in the front-rear direction on the first direction side of the accommodating portion,
The propeller shaft has a hole penetrating in the front-rear direction,
The vehicle power transmission device according to claim 1 or 2. The propeller shaft further has a pair of centering shaft portions provided on both sides of the fitting shaft portion in the front-rear direction,
The hollow portion is provided on both sides of the fitting hole portion in the front-rear direction, and further has a pair of centering hole portions that are fitted to the pair of centering shaft portions, respectively.
A vehicle power transmission device according to any one of claims 1 to 3. The propeller shaft is a first propeller shaft,
The hollow portion is a first hollow portion,
The fitting hole is a first fitting hole,
a transfer having, on the second direction side of the first propeller shaft, a first output portion for outputting in the first direction part of the power transmitted in the second direction;
It extends in the front-rear direction, the end on the second direction side is connected to the first output portion, and the joint portion, which is the end on the first direction side, is connected to the first propeller shaft. , the joint portion has a second hollow portion opened in the first direction, and at least part of the second hollow portion is an end portion of the first propeller shaft on the second direction side; a second propeller shaft, which is a second fitting hole spline-fitted to the end of the propeller shaft;
The second end of the first propeller shaft is further provided with a C ring fixed in the front-rear direction with respect to the second fitting hole,
A vehicle power transmission device according to any one of claims 1 to 4. The second fitting hole is
a circumferential groove in which the C ring is fitted;
and an inner diameter that decreases toward the second direction side,
The power transmission device for a vehicle according to claim 5. The joint portion engages with a jig after the second end portion of the first propeller shaft is spline-fitted into the second fitting hole portion of the second propeller shaft on the outer circumference on the first direction side. and has a joint-side circumferential groove for fixing the second propeller shaft,
The second end portion of the first propeller shaft is configured to fit the second end portion of the first propeller shaft to the second fitting hole of the second propeller shaft on the outer circumference on the first direction side of the C-ring. After spline fitting to the part, engaging with the jig, the second end of the first propeller shaft is inserted into the second fitting hole of the second propeller shaft. Having a first propeller shaft side circumferential groove for moving the first propeller shaft in the second direction,
The vehicle power transmission device according to claim 5 or 6. a cylindrical first shaft portion extending in the front-rear direction; a first bevel gear disposed at an end portion in the first direction that is one side of the first shaft portion in the front-rear direction; a drive pinion gear having a first hollow portion penetrating in the front-rear direction, wherein at least a portion of the first hollow portion is a fitting hole;
It extends coaxially with respect to the drive pinion gear in the second direction opposite to the first direction, and the fitting shaft portion spline-fitted into the fitting hole portion is arranged on the first direction side. a first propeller shaft having a first end, which is an end;
a second propeller shaft extending in the front-rear direction behind the first propeller shaft, the end on the first direction side being spline-fitted to the end on the second direction side of the first propeller shaft; and
The first hollow portion is adjacent to the fitting hole portion in the first direction and accommodates the fitting shaft portion against further movement of the first propeller shaft in the first direction. A method for assembling a power transmission device for a vehicle, further comprising a housing portion that allows
By moving the first propeller shaft in the first direction with respect to the drive pinion gear, the fitting shaft portion is spline-fitted into the fitting hole portion;
further moving the first propeller shaft in the first direction to accommodate the fitting shaft portion in the accommodating portion;
aligning a second end of the first propeller shaft on the second direction side and the second propeller shaft in a concentric manner;
By moving the first propeller shaft in the second direction, the fitting shaft is fitted into the fitting hole and the first propeller shaft and the second propeller shaft are spline fitted. , assembly method.

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