JPH054248B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a power distribution device that distributes power from a drive device to front wheels and rear wheels of a four-wheel drive vehicle or the like.

(b) Technical background and problems Conventionally, this type of power distribution device has been used, for example, in "4WD passenger cars" (written by Goro Suzuki, Sankaido, December 1982).
There is something similar to the one shown on page 72 of the 15th issue, as shown in Figure 1. That is, the hollow shaft 1 receives input from the engine side (not shown) which is the drive device.
01 is rotatably supported in a transfer case 103, and a differential case 107 of a differential device 105 is mounted on the output side of the hollow shaft 101.
are integrally connected. A pinion shaft 109 is fixed to the differential case 107, and a pinion gear 111 is rotatably supported by the pinion shaft 109 within the differential case 107. pinion gear 111
A pair of side gears 113 facing each other in the axial direction of the hollow shaft 101 are meshed with each other. One end of a front wheel drive shaft 115 is connected to one side gear 113, and the front wheel drive shaft 115 is connected to the hollow shaft 101.
It passes through the axial center of the wheel and extends toward the front wheel (not shown). The other side gear 113 has the hollow shaft 10
One end of an intermediate shaft 117 coaxial with 1 is connected to
The other end of the intermediate shaft 117 is connected to the transfer case 103
is supported via a bearing 119. Intermediate shaft 1
An intermediate gear 121 is fixed to the intermediate gear 17.
21 is meshed with an input gear 125 of a rear wheel drive shaft 123. The rear wheel drive shaft 123 is the intermediate shaft 117
It is arranged above the transfer case 103 and rotatably supported by the transfer case 103, and further extends toward the rear wheel (not shown). On the other hand, a first lock member 129 having a spline 127 on the outer circumference is fixed to the intermediate shaft 117, and a second lock member 133 having a spline 131 having the same diameter as the spline 127 is fixed to the differential case 107. There is. A sleeve 135 is engaged with the spline 127 and can be engaged with the spline 127 and the spline 131 simultaneously by sliding.

The input that the hollow shaft 101 receives from the engine is transmitted through the differential case 107, the pinion shaft 109, the pinion gear 111, and the side gear 113 to rotate the front wheel drive shaft 115 on the one hand, and the intermediate shaft 117 and the intermediate gear on the other hand. 12
1. The rear wheel drive shaft 123 is rotated via the input gear 125, and power is distributed to front wheels and rear wheels (not shown).

When a rotation difference occurs between the front wheel drive shaft 115 and the rear wheel drive shaft 123, the differential device 10
Smooth power transmission is achieved by the 5 differential. When a differential lock is required, the sleeve 135 is slid and engaged with both splines 127 and 131 at the same time using a differential lever (not shown) located in the driver's seat. can be integrated to achieve deflock. In addition, since the rear wheel drive shaft 123 is arranged above the intermediate shaft 117 which is coaxial with the hollow shaft 101, the rear wheel drive shaft 123 extends long behind the vehicle body.
It is easy to secure a ground clearance of 23 mm, making it extremely advantageous especially for off-road driving.

However, in such a conventional power distribution device, the pinion gear 111 and both side gears 113
There was a risk that the backlash would increase over time due to wear between the two and the noise generated from the differential device 105 would increase.

To address these problems, both side gears 113
It is conceivable to interpose an elastic member, such as a disc spring, between the differential case 107 and the differential case 107 to bias both side gears 113 in the thrust direction. By doing so, it is possible to suppress noise caused by backlash between the pinion gear 111 and both side gears 113.
However, in this case, a disc spring must be interposed between each of the side gears 113 and the differential case 107, which may complicate assembly and increase the number of parts.

(c) Purpose of the Invention This invention was devised in view of the above-mentioned problems, and its purpose is to provide a power distribution device that can suppress the complexity of assembly and the increase in the number of parts while reducing noise generation. do.

(d) Structure of the Invention In order to achieve the above object, the present invention includes an input shaft that receives input from the drive device side, a pinion shaft provided on the output side of the input shaft, a pinion gear rotatably supported by the pinion shaft, A pair of side gears that mesh with the pinion gear, an output shaft that is integrally interlocked with one of the side gears, and a differential that is integrally formed with the other side gear and accommodates the pinion shaft, pinion gear, and side gear, and from which power can be extracted. The power distribution device has a differential case, and an elastic member is interposed between the one side gear and the differential case to urge the one side gear in a thrust direction.

(E) Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on FIGS. 2 and 3.

A hollow shaft 1 serving as an input shaft is coupled via a transmission 5 to a drive shaft 3 which is coupled via a main clutch to a crankshaft of an internal combustion engine (not shown) serving as a drive unit. This hollow shaft 1 is divided into an output side 1a and an input side 1b via a sleeve 7. The sleeve 7 is spliced into the output side 1a and the input side 1b of the hollow shaft 1, and is configured to be slidable in the axial direction of the input shaft 1 by operating a defroster lever (not shown).

A pinion shaft 9 is fixed to the output end of the hollow shaft 1, and a pinion gear 11 is rotatably supported on the pinion shaft 9. A pair of side gears 13a, 13b similar to those shown in FIG. 1 are meshed with the pinion gear 11. Of the pair of side gears 13a, 13b, the side gear 13a on the rear side in the longitudinal direction of the vehicle body (the right side in FIG. 2) is spline-fitted to a collar 17 screwed onto one end of a front wheel drive shaft 15 serving as an output shaft. . Color 1
7 and the input side 1b of the output shaft 1, a spacer 21 is interposed via a thrust bearing 19,
The collar 17 is prevented from rotating by a nut 23 screwed onto the front wheel drive shaft 15. Further, a front wheel side differential device (not shown) is connected to the other end of the front wheel drive shaft 15.

The side gear 13b on the front side in the longitudinal direction of the vehicle body is integrally formed with the differential case 25. The differential case 25 houses the pinion shaft 9, pinion gear 11, and side gears 13a, 13b, and both ends of the differential case 25 are connected to a transfer case (not shown) via bearings (not shown). is rotatably supported. Therefore, it is possible to firmly support the differential case 25, which is heavy and receives a large meshing reaction force from the gears. The differential case 25 is provided with a drive gear 27, which can be engaged with an input gear (not shown) of a rear wheel drive shaft (not shown). Therefore, the drive can be taken out from the differential case 25.

On the other hand, the differential case 25 includes:
A receiving surface 29 is provided. This receiving surface 29 faces the back surface 31 of one of the side gears 13a spline-fitted to the collar 17 in the thrust direction (horizontal direction in FIGS. 2 and 3). A disc spring 33 is interposed between the receiving surface 29 and the back surface 31 as an elastic member that biases the side gear 13a in the thrust direction.

Further, the front end (left end in FIG. 2) of the differential case 25 is slightly protruded, and a case-side pawl 35 is provided between the differential case 25 and the sleeve 7 as an engaging portion for a differential lock. On the other hand, the sleeve 7 is provided with a sleeve-side claw 37 as an engaging portion that faces the case-side claw 35. Since the sleeve 7 is located on the front side of the differential case 25, it is easy to put together the shift lever of the transmission (not shown), which is also located on the front side, and the differential lever (not shown) that operates the sleeve 7 in one place.

Next, the operation of the above embodiment will be explained.
The input received by the hollow shaft 1 from the internal combustion engine, which is a drive device, via the drive shaft 3 and the transmission 5 causes the front wheel drive shaft 1 to be transmitted via the pinion shaft 9, the pinion gear 11, and the side gears 13a, 13b.
5 is rotated, and the differential case 25, drive gear 27, and input gear (not shown) are rotated on the other hand.
A rear wheel drive shaft (not shown) is rotated through the rear wheel, and power is distributed to front wheels and rear wheels (not shown). When a rotation difference occurs between the front wheel drive shaft 15 and the rear wheel drive shaft, a rotation difference occurs between the side gear 13a on the front wheel drive shaft 15 side and the side gear 13b on the rear wheel drive side, and the pinion gear 11 rotates. Absorbed. When a differential lock is required, by sliding the sleeve 7 using a differential lever (not shown) located at the driver's seat and engaging the sleeve-side pawl 37 with the case-side pawl 35, the hollow shaft 1 and the differential case 25 can be locked. Defrot lock can be achieved by integrating the two.

On the other hand, due to the force of the disc spring 33 between the back surface 31 of the side gear 13a and the receiving surface 29 of the differential case 25, the side gear 13a is urged in the thrust direction, and the backlash between the side gear 13a and the pinion gear 11 is reduced. . At the same time, since the pinion gear 11 is not fixedly supported by the differential case 25, it is pushed toward the side gear 13b, and the backlash between the side gear 13b and the pinion gear 11 is also reduced.
Therefore, it is possible to suppress noise caused by backlash. Further, even when a bump is likely to occur over time due to wear between the pinion gear 11 and both side gears 13a and 13b, the disc spring 33 expands accordingly, making it possible to suppress noise generation due to the bump. .

Note that when the pinion gear 11 moves in the thrust direction, the pinion shaft 9 and the output side 1a of the hollow shaft 1 can move in the thrust direction with respect to the side gear 13b and the differential case 25 without any problem.

In addition, when assembling, the output side 1a of the hollow shaft 1, the pinion shaft 9, the pinion gear 11, the side gear 13a,
13b and the disc spring 33 are sub-assembled,
This can be fitted into one end of the front wheel drive shaft 15, so that the output side 1a of the hollow shaft 1 is spline-fitted to the sleeve 7, and the side gear 13a is spline-fitted to the collar 17.

Note that this invention is not limited to the above embodiment. For example, other elastic members may be used instead of the disc spring 33.

(F) Effects of the Invention As is clear from the above, according to the structure of the present invention, by simply providing an elastic member between the differential case and one side gear, bump crash between the pinion gear and both side gears can be reduced, and noise can be reduced. It is possible to suppress the increase in the number of parts and the complexity of assembly while reducing the number of parts.

[Brief explanation of drawings]

FIG. 1 is a partially omitted vertical sectional view of a power distribution device according to a conventional example, FIG. 2 is a partially omitted longitudinal sectional view of a power distribution device according to an embodiment of the present invention, and FIG. It is a partially enlarged view. 1...Hollow shaft (input shaft), 9...Pinion shaft, 11...Pinion gear, 13a, 13b...
...Side gear, 15...Front wheel drive shaft (output shaft),
25...differential case, 33...disc spring (elastic member).

Claims (1)

[Claims] 1. A hollow shaft that receives input from the drive device side, a pinion shaft provided on the output side of the hollow shaft, a pinion gear that is rotatably supported by the pinion shaft, a pair of side gears that mesh with the pinion gear, and one side gear that is integrally connected to one of the side gears. A power distribution device comprising: an output shaft that is interlocked with the other side gear; and a differential case that is integrally formed with the other side gear and houses the pinion shaft, pinion gear, and sight gear and is capable of extracting power; The pinion shaft and the output side of the hollow shaft are configured to be movable in a thrust direction relative to the other side gear and the differential case, and the one A power distribution device characterized by interposing an elastic member that urges a side gear in a thrust direction.