JPH0610996A - Differential limiting device - Google Patents

Abstract

PURPOSE:To surely support the pinion gear of a differential limiting device, satisfactorily maintain the engagement, improve the strength and durability, reduce the number of part items, and facilitate the assembling work. CONSTITUTION:A differential limiting device is constituted of a case 1, the first shaft 11 and the second shaft 13 inserted from one end side and the other end side of the case 1 and rotated coaxially with the case 1, the first and second side gears 17, 19 provided on the outer peripheries of the first and second shafts 11, 13, multiple pairs of the first and second storage holes 25, 27 formed in the case l along the outer peripheries of the first and second side gears 17, 19, and the first and second pinion gears 39, 41 stored in the first and second storage holes 25, 27, engaged with the first and second side gears 17, 19 on one end side, and engaged with each other on the other end side. The first support section 21 supporting the second pinion gear 39 is provided on the first side gear 17, and the second support section 23 supporting the first pinion gear 39 is provided on the second side gear 19 in the differential limiting device.

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 used in vehicles and the like.

[0002]

2. Description of the Related Art A conventional differential limiting device is disclosed in Japanese Patent Laid-Open No.
There is one disclosed in Japanese Patent Laid-Open No. 3-76938.

In this differential limiting device, first and second shaft holes are formed concentrically with the rotary shaft on both sides of a case where rotation is input,
The first and second shafts are inserted into the case through the first and second shaft holes, and the first and second shafts are provided on the outer circumferences of the opposite ends of both shafts.
Side gears are provided, and two pairs of first and second housing holes are formed along the outer circumference of both side gears in the case. One end side (outside) meshes with the first and second side gears in both housing holes. The first and second pinion gears whose other ends (inner side) mesh with each other are housed and held, and a thrust block is provided between the end faces of both side gears facing each other in the case.

The thrust block supports the outer circumferences of the other ends of the first and second pinion gears fixed to the case and meshing with each other. The thrust block is applied to both pinion gears when the case rotates. The tooth load in the radial direction is reliably supported, the rotation of the case is satisfactorily differentially transmitted to both shafts, and the durability of the pinion gear, side gear, etc. is improved.

[0005]

However, in such a differential limiting device, since it is necessary to separately provide a thrust block, the number of parts increases, the device becomes complicated, and the productivity is lowered. I was afraid.

Further, since the thrust block and the side gear are separate bodies and the thrust block rotates integrally with the case, the first side gear, the second side gear and the thrust block rotate differently when the differential is limited. I will end up. Therefore, the meshed state of the pinion gear and the side gear and the meshed state of the pinion gears are likely to deteriorate.

The present invention has been made to solve the above-mentioned conventional problems.
Supports the pinion gear securely and maintains the meshed state of the pinion gears and the meshed state of the pinion gear and the side gear, improving the strength and durability of the pinion gear and the side gear, and increasing the number of parts The purpose of the present invention is to provide a limited slip differential device that is easy to assemble.

[0008]

In order to achieve the above object, the present invention provides a case which is rotated by a driving force of an engine and a first case which is inserted into the case from one end side of the case and is coaxially rotated with the case. A shaft; a second shaft that is inserted into the case from the other end side of the case and rotates coaxially with the case; and a first shaft that is provided on the outer periphery of the first shaft and that rotates with the first shaft in the case. The side gear, a second side gear that is provided on the outer circumference of the second shaft and rotates together with the second shaft in the case, and a predetermined distance along the outer circumferences of the first and second side gears. A pair or a plurality of pairs of first and second housing holes formed in the case, a first pinion gear housed in the first housing hole and one end side of which meshes with the first side gear, and the second A differential limiting device that is housed in a housing hole and has one end side that meshes with the second side gear and the other end side that includes a second pinion gear that meshes with the other end side of the first pinion gear. The first side gear is provided with a first support portion for supporting the outer circumference of the other end side of the second pinion gear on the outer peripheral surface, and the second side gear is provided with an outer circumference surface of the other end side of the first pinion gear. The second support portion that is supported by is provided.

[0009]

According to the differential limiting device of the present invention, when a driving resistance difference is generated between the first shaft and the second shaft, the outer peripheral surfaces of the first and second pinion gears and the first and second pinion gears. Friction torque is generated by the inner peripheral surface of the second accommodation hole, and differential limitation is performed.

At this time, the first pinion of the second pinion gear
The other end side of the first pinion gear, which meshes with the pinion gear, is supported by the first support portion, and the other end side of the first pinion gear, which meshes with the second pinion gear, is supported by the second support portion. Therefore, the meshed state of the pinion gears and the meshed state of the pinion gear and the side gear are maintained well, and the strength and durability of the pinion gear and the side gear are improved.

Further, since the first supporting portion is provided on the first side gear and the second supporting portion is provided on the second side gear,
Assembling work can be facilitated without increasing the number of parts.

Further, the other end side of the first pinion gear contacts the outer peripheral surface of the second support portion, the other end side of the second pinion gear contacts the outer peripheral surface of the first support portion, and the friction torque is As a result, this friction torque effectively limits the differential.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view (a sectional view taken along line AA of FIG. 3) of an embodiment of the differential limiting device according to the present invention, and FIG.
1 is a cross-sectional view taken along the line BB of the differential limiting device in FIG. 1, and FIG. 3 is a side view from the direction C of the differential limiting device in FIG.

The case 1 is composed of a case body 3 and a cover 5, and is rotated by driving an engine mounted on a vehicle (not shown). A first shaft hole 7 is formed in the case body 3, and a second shaft hole 9 is formed in the cover 5 concentrically with the rotation shaft of the case 1. In the first shaft hole 7 and the second shaft hole 9, the first shaft 1 is rotatably coaxial with the case 1.
1 and the second shaft 13 are inserted, and both shafts 1
One end of each of 1, 1 has an accommodation chamber 15 formed in the case 1.
Has been inserted into.

First shaft 1 inserted in case 1
A first side gear 17 and a second side gear 19 are spline-connected to the outer peripheral portions of the first and second shafts 13, respectively. First side gear 17 and second side gear 19
Is rotatably housed and held in a housing chamber 15 inside the case 1, and helical gears having opposite spiral angles are formed on the outer peripheries of both side gears 17 and 19. A first support portion 21 is integrally formed with the first side gear 17 on one end side of the first shaft 11, and a second support portion 23 is formed on the one end side of the second shaft 13 with a second support portion 23. It is formed integrally with the side gear 19. Both support parts 21 and 23 have a cylindrical shape with substantially the same diameter, and the open side surfaces of both support parts 21 and 23 face each other at substantially the center of the case 1.

As shown in FIG. 2, the case main body 3 is provided with a pair of a first accommodating hole 25 and a second accommodating hole 27 along the outer circumferences of the first and second axial holes 7 and 9. Four pairs of and are provided at equal intervals. The first accommodation hole 25 is formed to a predetermined depth from the first shaft hole 7 side, and the second accommodation hole 27 is substantially the same depth as the first shaft hole 7 from the second shaft hole 9 side. Is formed in. The first accommodating hole 25 and the second accommodating hole 27 communicate with each other at a communication portion 29 at the substantially center of the case body 3, and the accommodating chamber 15 is opened to the rotation shaft side of each accommodating hole 25, 27. Openings 31 and 33 are formed. Annular locking portions 35 and 37 are attached to the outer sides of the housing holes 25 and 27 of the case body 3 and the cover 5 in the axial direction.

A first pinion gear 39 is housed in the first housing hole 25, and a second pinion gear 41 is housed in the second housing hole 27. The inner peripheral surface of each accommodation hole 25, 27 is formed so as to generate a predetermined frictional resistance with the outer peripheral surface of the addendum of each pinion gear 39, 41. Both the pinion gears 39 and 41 have substantially the same length, and a helical gear having spiral angles in opposite directions is formed on the whole.
Both pinion gears 39 and 41 are provided on the wall 4 of the case body 3.
Axial movement is blocked by 3, 45 and locking portions 35, 37.

On the side of the first shaft hole 7 of the first pinion gear 39, the opening 31 engages with the first side gear 17, and
The side of the pinion gear 41 on the side of the second shaft hole 9 meshes with the second side gear 19 at the opening 33.

The first pinion gear 39 and the second pinion gear 41 are in mesh with each other at a communication portion 29 at the substantially center of the case body 3. In this meshing portion, the outer peripheries of both pinion gears 39 and 41 project into the storage chamber 15 through the openings 31 and 33, and the first support portion 21 and the second support portion 2
It is supported by the outer circumference of 3.

The case 1 of the differential limiting device thus constructed is held on the vehicle body side by a bearing (not shown). A gear (not shown) is attached to a flange portion formed on the outer circumference of the case body 3, and this gear has
The rotational force of the engine is input via the power transmission device. The first and second shafts 11 and 13 are interlockingly connected to the left and right axles of a vehicle (not shown).

Next, the operation of the differential limiting device according to this embodiment will be described.

When the road surface condition is good, the first side gear 17 and the second side gear 19 do not move relative to each other, so that the case 1, the first and second side gears 17, 1
9, and the first and second pinion gears 39 and 41 rotate substantially as a unit, whereby the first and second shafts 1
The left and right wheels are rotationally driven via 1 and 13.

When the road surface condition deteriorates and one of the wheels slips, resulting in a drive resistance difference between the left and right wheels, the first side gear 17 and the second side gear 19 cause relative movement, and The first and second pinion gears 39 and 41 rotate. At this time, a friction torque is generated between the tooth tip outer peripheral surface of each pinion gear 39, 41 and the inner peripheral surface of each accommodation hole 25, 27, and rotation of the first and second pinion gears 39, 41 is suppressed. , The differential limitation between the left and right wheels is performed.

At the time of such differential limitation, the meshing portion of the first pinion gear 39 and the second pinion gear 41 is supported by the first and second support portions 21 and 23, so this meshing is performed. Pinion gear 3 generated in the
The meshing reaction force of 9, 41 is reliably supported. As a result, the meshed state of the two pinion gears 39, 41 is maintained in good condition, and the first and second pinion gears 39, 4 are
The meshed state between the first gear and the first and second side gears 17, 19 is also maintained in a good condition. Therefore, the pinion gears 39, 41
And the strength and durability of the side gears 17, 19 are improved,
A large driving force can be transmitted.

Further, the first and second pinion gears 39,
41 contacts the outer peripheral surfaces of the first and second support portions 21 and 23, and friction torque is generated at the contact portions, so that differential limitation can be effectively performed.

Further, the first support portion 21 and the second support portion 2
3 is a first side gear 17 and a second side gear 19
Since it is formed integrally with each, the number of parts does not increase,
Assembly work becomes easy.

[0028]

As described above, according to the present invention, the meshed state of the pinion gears and the meshed state of the pinion gear and the side gear are maintained well, and the strength and durability of the pinion gear and the side gear are maintained. And the assembly work can be facilitated without increasing the number of parts.

Further, the differential torque is effectively limited by the friction torque generated between the first support portion and the second pinion gear and between the second support portion and the first pinion gear. You can

[Brief description of drawings]

FIG. 1 is a front sectional view (a sectional view taken along the line AA of FIG. 3) of an embodiment of a differential limiting device according to the present invention.

2 is a cross-sectional view taken along the line BB of the limited slip differential device of FIG.

3 is a side view from the direction C of the limited slip differential device of FIG. 1. FIG.

[Explanation of symbols]

 1 Case 11 1st shaft 13 2nd shaft 17 1st side gear 19 2nd side gear 21 1st support part 23 2nd support part 25 1st accommodation hole 27 2nd accommodation hole 39 1st Pinion gear 41 Second pinion gear

Claims (1)

[Claims] 1. A case which is rotated by a driving force of an engine, a first shaft which is inserted into the case from one end side of the case and rotates coaxially with the case, and a case which is inserted into the case from the other end side of the case. A second shaft that rotates coaxially with the first shaft; a first side gear that is provided on the outer periphery of the first shaft and rotates with the first shaft in the case; and a second shaft that is provided on the outer periphery of the second shaft in the case A second side gear that rotates with the second shaft, and a pair or a plurality of pairs of first and second pairs formed in the case at a predetermined interval along the outer circumferences of the first and second side gears. An accommodating hole, a first pinion gear that is accommodated in the first accommodating hole and has one end side meshing with the first side gear, and an accommodating hole that is accommodated in the second accommodating hole and one end side meshes with the second side gear. And a second pinion gear having the other end side meshing with the other end side of the first pinion gear, wherein the first side gear has the other end side of the second pinion gear. A first supporting portion for supporting the outer periphery on the outer peripheral surface, and a second supporting portion for supporting the outer periphery on the other end side of the first pinion gear on the outer peripheral surface are provided on the second side gear. Differential limiting device.