JPH08334161A - Differential limiting device - Google Patents

Abstract

PURPOSE: To change differential limiting performance and to easily return the performance even when the differential limiting performance is lowered. CONSTITUTION: A differential case 1 consisting of a case main body 3 and a cover 5 free to divide in the axial direction and rotationally driven by driving force of an engine, a pinion shaft 9 to integrally rotate with the differential case 1, a pinion gear 15 supported by the pinion shaft 9 free to rotate, a pair of side gears 17, 19 to engage with the pinion gear 15 and a multidisc clutch 39 provided between the differential case 1 and the side gear 17 and to limit differential motion of both of the side gears 17, 19 are furnished. Thereafter, the multidisc clutch 39 is arranged between the cover 5 and the side gear 17, and a spacer member 49 to set moving quantity of the multidisc clutch 39 in the axial direction free to regulate is provided on the cover 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential limiting device for a differential device used in a vehicle.

[0002]

2. Description of the Related Art Conventionally, a differential limiting device used for a large vehicle such as a large truck is large in size and heavy in weight. Therefore, a differential assembly and a clutch assembly are separately assembled, and both are integrally combined. Built into the car body.

As a conventional differential limiting device of this type, for example, there is one shown in FIGS. 3 and 4 described in Japanese Utility Model Laid-Open No. 58-102325.

This differential limiting device includes a differential assembly D.
The clutch assemblies C are fitted to both sides of the carrier R, and these are integrally assembled on the carrier R side.

The differential assembly D has a drive shaft 101 and a pinion gear 10 driven by a rotational force from an engine (not shown).
The differential case 1 that rotates via the ring gear 105 and the ring gear 105.
07 and the case 107 disposed in the differential case 107.
The cross shaft 109 supported by the cross shaft 109, the pinion gear 111 rotatably supported by the cross shaft 109, and the case 1
The left and right side gears 1 are composed of a pair of left and right side gears 113 which are housed inside the gear 07 and mesh with the pinion gear 111.
An output shaft 115 is spline-connected to the shaft 13.

The clutch assembly C is fixed to the differential case 107 with bolts 117, and the output shaft 11 is fixed.
5 includes a case cover 119, and a multi-plate clutch mechanism 121 provided between the case cover 119 and the side gear 113.

The multi-disc clutch mechanism 121 is formed on the outer periphery of the boss 127 of the side gear 113 and a plurality of outer friction plates 125a fitted in the spline grooves 123 formed on the inner periphery of the case cover 119 so as to be movable in the axial direction. The plurality of inner friction plates 125b fitted in the formed spline grooves 129 so as to be movable in the axial direction are alternately arranged, and the outermost end side (the case cover 119 side in FIG. 3) friction plate 125 and the case cover 119 are arranged. And a plurality of disc springs 131 arranged between the innermost end and the innermost end (side gear 113 side in FIG. 3).
Of the friction plate 125 of the spline groove 1 of the case cover 119.
It is positioned by a locking member 135 (for example, a snap ring or the like) that is fitted in a ring-shaped groove 133 formed in 23.

Then, when assembling the differential limiting device,
The differential assembly D and the clutch assembly C are separately formed, and they are combined and integrated into a differential carrier R.

[0009]

However, in the conventional differential limiting device as described above, the spring force of the disc spring 131 and the axial movement amount of the multi-plate clutch mechanism 121 cause the locking member 135 to be attached. Since it is determined by the position, there is a problem that the differential limiting performance cannot be changed,
Further, there is a problem that the differential limiting performance is deteriorated due to wear of the friction plate 125 and settle of the disc spring 131 with long-term use.

Therefore, an object of the present invention is to provide a differential limiting device capable of changing the differential limiting performance and easily restoring the performance even when the differential limiting performance is lowered.

[0011]

In order to solve the above problems, a differential limiting device according to a first aspect of the present invention is a differential case which comprises a case body and a cover which are axially separable and which is rotationally driven by a driving force of an engine. , A pinion shaft that rotates integrally with the differential case, a pinion gear that is rotatably supported by the pinion shaft, a pair of side gears that mesh with the pinion gear, and a differential between both side gears that is provided between the differential case and the side gear. A multi-plate clutch for limiting the multi-plate clutch is arranged between the cover and one side gear, and a spacer member for setting the axial movement amount of the multi-plate clutch is adjustable on the inner peripheral side of the cover. It is characterized by being installed in.

A differential limiting device according to a second aspect is the differential limiting device according to the first aspect, characterized in that the spacer member is a spacer nut that is screwed into a screw portion formed on the inner periphery of the cover.

[0013]

In the differential limiting device according to the first aspect of the present invention, the multi-plate clutch can be assembled on the cover side, and the difference can be obtained by adjusting the axial movement amount of the multi-plate clutch by the spacer member provided on the inner peripheral side of the cover. Dynamic limit performance can be set.

Therefore, the differential limiting performance can be arbitrarily changed, and the performance can be easily restored even when the differential limiting performance is lowered. Also, by providing the spacer member on the inner peripheral side of the cover, the cover which is a rotating system does not project to the outside, so that interference with the member outside the differential case which is a fixed system can be avoided, and the structure of the surroundings is changed and accordingly Upsizing can be prevented.

A differential limiting device according to a second aspect of the present invention is the differential limiting device according to the first aspect, wherein the spacer member is a spacer nut that is screwed into a screw portion formed on the inner circumference of the cover.

Therefore, similarly to the differential limiting device according to the first aspect, the differential limiting performance can be arbitrarily changed, and even when the differential limiting performance is lowered, the performance can be easily restored.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a differential limiting device according to an embodiment of the present invention. The left and right directions are the left and right directions in FIG. 1, and members without reference numerals are not shown.

The differential case 1 is composed of a case body 3 and a cover 5 which can be divided into two parts in the axial direction, and are integrally fastened with a bolt 7.

Inside the differential case 1, pinion shafts 9 are arranged in a cross shape with the boss portion 11 as the center, and each pinion shaft 9 has an end portion in the groove 1 of the differential case 1.
It is supported by 3 so as to be movable in the axial direction. A pinion gear 15 is rotatably supported on each pinion shaft 9.

Left and right side gears 17 and 19 are arranged inside the differential case 1. Left side gear 1
A boss 21 is rotatably supported by a support 23 of the cover 5. The right side gear 19 is rotatably supported by a support portion 27 of the case body 5 by a boss portion 25. A washer 29 is arranged between the left side gear 17 and the cover 5. A washer 31 is arranged between the right side gear 19 and the case body 3. Side gear 1
Reference numerals 7 and 19 mesh with each pinion gear 15. The side gears 17 and 19 are spline-connected to the left and right output shafts via the boss portions 21 and 25, respectively.

The rear surface of each pinion gear 15 (differential case 1
A washer 33 that slides on the back surface is disposed between the case body 3 and the outer surface in the radial direction). The sliding surface of the washer 33 is spherical, and the side gears 17, 19
It bears the meshing reaction force of the pinion gear 15 and the centrifugal force of the pinion gear 15 due to the meshing with the pinion gear 15.

In this way, the bevel gear type differential mechanism 35 is constructed. The pinion shaft 9, the pinion gear 15, and the side gears 17 and 19 of the differential mechanism 35 can be appropriately moved in the axial direction.

The driving force of the engine for rotating the differential case 1 is distributed from the pinion shaft 9 to the side gears 17 and 19 via the pinion gear 15 and transmitted to the output shaft.
When a drive resistance difference occurs between the output shafts, the rotation of the pinion gear 15 causes the engine drive force to be differentially distributed to the left and right sides.

A multi-plate clutch 39 is arranged between the boss portion 37 of the left side gear 17 and the cover 5.

The multi-disc clutch 39 is formed on the outer periphery of the boss portion 37 of the side gear 17 and a plurality of outer friction plates 43a fitted in a spline groove 41 formed on the circumference of the cover 5 so as to be movable in the axial direction. The plurality of inner friction plates 43b fitted in the spline grooves 45 so as to be movable in the axial direction are alternately arranged, and the inner end side thereof (the left side gear 17 in FIG.
A plurality of disc springs 47 are arranged on the (side) friction plate 43.

An annular spacer nut 49 is provided on the inner end side of the multi-plate clutch 39 as a spacer member for adjusting the axial movement amount of the multi-plate clutch 39 and setting the axial movement amount. Is screwed into a threaded portion 51 formed in the spline groove 41.

Therefore, by screwing the spacer nut 49 into the screw portion 51 of the cover 5, the axial movement amount of the multi-plate clutch 39 can be set small, and the spacer nut 49 can be loosened via the screw portion 51 of the cover 5. This makes it possible to set a large amount of axial movement of the multi-plate clutch 39.

Then, at the position where the axial movement amount of the multi-plate clutch 39 is set, the spacer nut 49 is prevented from rotating.
Fix at 3. The anti-rotation member 53 has screws 55 on the cover 5.
And so on.

In this way, the differential limiting mechanism 57 is constituted by the multi-plate clutch 39. And the multi-plate clutch 3
When 9 is fastened, the relative rotation between the side gear 17 and the differential case 1 is braked, and the differential of the differential mechanism 35 is limited.

The differential limiting performance for limiting the differential can be changed by adjusting the axial movement amount of the multi-plate clutch 39 with the spacer nut 49.

When the multi-plate clutch 39 is assembled to the cover 5, a dummy shaft having a spline groove having the same diameter as the boss portion 37 of the one side gear 17 and the same size as the spline groove 45 is arranged in the cover 5. The inner and outer friction plates 43a and 43b and the disc spring 47 are incorporated, and the spacer nut 49 is screwed into the threaded portion 51 of the cover 5 to set the axial movement amount of the multi-plate clutch 39 and prevent the spacer nut 49 from rotating. It is fixed by the member 53. Then, the dummy shaft is pulled out to complete the clutch assembly.

Since the clutch assembly can be assembled in this way, the differential limiting performance can be easily adjusted and the performance can be checked with the clutch assembly alone on the cover 5 side.
In addition, the adjustment of the axial movement amount does not require the complexity of parts management without preparing various spacers for various movement amounts.

As described above, in the differential limiting device of this embodiment, the multi-plate clutch 39 can be assembled on the cover 5 side, and the axial movement amount of the multi-plate clutch 39 can be adjusted by the spacer nut 49. Thus, the differential limiting performance can be set arbitrarily. Therefore, the differential limiting performance can be arbitrarily changed, and even when the differential limiting performance is lowered, the performance can be easily restored.

Further, since the spacer member is provided on the inner peripheral side of the cover, the cover which is the rotating system does not project to the outside, so that the interference with the member outside the differential case which is the fixed system can be avoided, and the structure of the surroundings can be changed accordingly. It is possible to prevent the size from increasing.

Further, since the spacer nut 49 has an annular shape, the multi-plate clutch 39 can be used even if a slight amount of differential limiting performance adjustment is performed.
Can be uniformly pressed, and uneven wear due to one-sided contact can be effectively prevented.

The means for stopping the rotation of the spacer nut 49 is not limited to the screw 55 for the above-mentioned rotation preventing member 53, but may be any means for restricting rotation such as caulking.

[0038]

As is apparent from the above description, in the differential limiting device according to the first aspect, the multi-plate clutch can be assembled on the cover side, and the axial movement amount of the multi-plate clutch is adjusted by the spacer member. Since the differential limiting performance can be set by doing so, the differential limiting performance can be arbitrarily changed, and the performance can be easily restored even when the differential limiting performance deteriorates. Also, since the spacer member is provided on the inner circumference side of the cover, the cover which is a rotary system does not project to the outside, so that interference with the member of the differential case part which is a fixed system can be avoided, and accordingly the structure of the surroundings is changed and accordingly Upsizing can be prevented.

The differential limiting device according to a second aspect is the differential limiting device according to the first aspect, in which the spacer member is a spacer nut screwed to a screw portion formed on the inner circumference of the cover.
Similar to the differential limiting device according to the first aspect, the differential limiting performance can be arbitrarily changed, and the performance can be easily restored even when the differential limiting performance is deteriorated.

[Brief description of drawings]

FIG. 1 is a sectional view of a differential limiting device according to an embodiment of the present invention.

FIG. 2 is a side view showing the relationship between the spacer nut and the detent member of FIG.

FIG. 3 is a cross-sectional view of a differential limiting device according to a conventional example.

4 is a cross-sectional view of a clutch assembly C portion of FIG.

[Explanation of symbols]

 1 differential case 3 case body 5 cover 9 pinion shaft 15 pinion gear 17, 19 side gear 39 multi-plate clutch 49 spacer nut (spacer member)

Claims (2)

[Claims] 1. A differential case, which comprises an axially separable case body and a cover and is rotationally driven by a driving force of an engine, a pinion shaft which rotates integrally with the differential case, and a rotatably supported by the pinion shaft. A pinion gear, a pair of side gears that mesh with the pinion gear, and a multi-disc clutch that is provided between the differential case and the side gear and limits the differential between both side gears are provided.The multi-disc clutch includes the cover and one side gear. A differential limiting device, characterized in that a spacer member, which is arranged in between, is provided on the inner peripheral side of the cover so as to adjust the axial movement amount of the multi-plate clutch. 2. The differential limiting device according to claim 1, wherein
A differential limiting device, wherein the spacer member is a spacer nut that is screwed into a screw portion formed on the inner circumference of the cover.