JPH09144845A - Differential limiter - Google Patents

Abstract

(57) [PROBLEMS] To provide a differential limiting device capable of reducing the number of parts to reduce the size and weight and improve the strength and durability of a gear. SOLUTION: A diff case 1 that is rotated by a driving force of an engine, a sun gear 3 and an internal gear 5 that are rotatably arranged in the diff case 1, and a sun gear that is slidably rotatably housed in a housing hole 11 of the diff case 1. 3 and a differential mechanism 15 having a pinion gear 13 that meshes with the internal gear 5, and a friction clutch 19 arranged between any two of the three members of the differential case 1, the sun gear 3, and the internal gear 5. And the differential mechanism 1
The engagement means for engaging the friction clutch 19 so as to controllably limit the differential of No. 5 is provided.

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 or the like.

[0002]

2. Description of the Related Art A differential apparatus as shown in FIG. 2 is disclosed in Japanese Utility Model Laid-Open No. 6-16731.

This differential device 101 includes a differential case 103 that is rotated by the driving force of the engine, left and right hubs 105 and 107 that transmit the driving force to the left and right axles coaxially arranged inside the differential case 103, and the inside of the differential case 103. And a double pinion planetary gear type differential mechanism 109 arranged.

The internal gear 111 is a differential case 10.
3, the sun gear 113 is formed on the left hub 105. Outer and inner pinion gears 115, 117
Is the left and right pinion carriers 123, 12 via the bushes 122 by the respective shaft portions 119, 121 formed at both ends.
5 is supported. These pinion carriers 121
3, 125 are integrated by welding, and the right pinion carrier 125 is meshed with the right hub 107 by a meshing portion 127.

The driving force of the engine for rotating the differential case 103 is the internal gear 111 of the differential case 103.
From the sun gear 1 through each pinion gear 115, 117.
13 and the pinion gears 123 and 125 and transmitted to the left and right axles via the left and right hubs 105 and 107, and the driving force is generated by the rotation and revolution of the pinion gears 115 and 117 that cause a difference in drive resistance between the two axles. Are differentially distributed to the left and right sides.

On the left side of the differential mechanism 109, a multi-plate type main clutch 129 for connecting the left pinion carrier 123 and the left hub 105 is arranged. A cam ring 131 is arranged on the outer periphery of the right hub 107, and a multi-plate pilot clutch 133 is arranged between the cam ring 131 and the differential case 103. Cam ring 1
A ball cam 1 is provided between 31 and the pinion carrier 125.
35 is formed, and the right side chamber 10 of the differential case 103 is formed.
A bearing 137 that receives the cam thrust force is disposed between the cam ring 131 and the cam ring 131.

An armature 139 is disposed on the left side of the pilot clutch 133 and is positioned by a permanent magnet snap ring 141 mounted on the inner circumference of the differential case 103. A ring-shaped electromagnet 143 is arranged on the right side of the right side wall 103a. Electromagnet 143 is coil 145
And the yoke 147, the yoke 147 is the bearing 1
It is supported by the differential case 103 via 49 and is prevented from rotating around the differential carrier by a supporting member. A ring 153 of stainless steel is welded to the right side wall 103a for preventing the magnetic flux 151 of the electromagnet 143 from being short-circuited and leading to the armature 139. In addition, the cylindrical portion 103b of the differential case 103 in which the pilot clutch 133 is arranged
Is made of stainless steel to block the leakage of magnetic flux to the left.

In this way, the differential limiting mechanism 155 is constructed, and when the electromagnet 143 is excited, magnetic flux is generated and the armature 1
39 is sucked, the pilot clutch 133 is engaged, and the cam ring 131 is connected to the differential case 103. In this state, the differential torque of the differential mechanism 109 is applied to the ball cam 135, and the cam thrust force causes the main clutch 12 to pass through the pinion carriers 123 and 125.
9 is pressed and fastened. In this way, each clutch 12
The differential force of the differential mechanism 109 is limited by the fastening force of 9,133.

[0009]

However, in the conventional differential device as described above, the pinion carriers 119 and 121 for supporting the pinion gears 115 and 117 must be provided, which increases the number of parts. Since the device becomes complicated and the axial direction of the differential case 103 becomes large, it is difficult to reduce the size and weight of the device.

Further, in order to increase the strength of each gear, it is necessary to increase the gear engagement width.
There is a problem in that the size of the device 3 in the axial direction becomes large and the device becomes large.

Therefore, an object of the present invention is to provide a differential limiting device which can reduce the number of parts to reduce the size and weight and improve the strength and durability of gears.

[0012]

In order to solve the above-mentioned problems, a differential limiting device according to a first aspect of the present invention is a differential limiting device which rotates by a driving force of an engine, a sun gear and an internal rotatably arranged in the differential case. A differential mechanism having a gear and a pinion gear that is slidably and rotatably housed in a housing hole of the differential case and meshes with the sun gear and the internal gear, and between any two members of the three members of the differential case, the sun gear, and the internal gear. And a fastening means for fastening the friction clutch so as to controllably limit the differential of the differential mechanism.

Therefore, the conventional carrier for supporting the pinion gear can be omitted, the number of parts can be reduced, and the cost can be reduced.

Further, the space for omitting the carrier is reduced, and the size can be reduced mainly in the axial direction.

Further, since the carrier is eliminated, the tooth width of each gear can be made sufficient, and the strength and durability of the gear are improved.

A differential limiting device according to a second aspect of the present invention is the differential control device according to the first aspect, wherein the friction clutch is disposed between the sun gear and the internal gear, and the end face of the pinion gear and the internal gear are provided. It is characterized in that it is arranged adjacent to the side wall.

Therefore, it is not necessary to separately provide an engaging member for the friction clutch, the friction clutch can be arranged with a simple structure, and a large differential limiting force can be obtained.

A differential limiting device according to a third aspect is the differential limiting device according to the first aspect, wherein the engaging means engages the pilot clutch, a cam for amplifying the engaging force of the pilot clutch, and the pilot clutch. It is characterized by being configured by an electromagnet.

Therefore, it has the same effect as that of the differential limiting device according to the first aspect.

[0020]

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 rotated by the driving force of the engine mounted on the vehicle. A sun gear 3 and an internal gear 5 are arranged inside the differential case 1. The sun gear 3 and the internal gear are rotatably supported by shaft supporting portions 7 and 9 formed between the sun gear 3 and the internal gear. One drive shaft is spline-connected to the sun gear 3, and the internal gear 5 is spline-connected to the other drive shaft.

A plurality of storage holes 11 are provided in the differential case 1 along the outer periphery of the sun gear 3, and a pinion gear 13 is slidably and rotatably stored in these storage holes 11. The pinion gear 13 meshes with the sun gear 3 and also meshes with the internal gear 5.

In this way, the differential mechanism 15 is constructed.

The differential case 1 is provided with an opening 17 communicating with the storage hole 11, through which the oil in and out of the oil sump and the meshing parts and sliding parts of each gear are lubricated.

The driving force of the engine for rotating the differential case 1 is distributed to the sun gear 3 and the internal gear 5 via the pinion gears 13 and transmitted to the drive shafts on each side, and the drive resistance difference between the both drive shafts is also transmitted. When this occurs, the driving force is differentially distributed to each side due to the rotation and revolution of the pinion gear 13.

A multi-plate main clutch 19 (friction clutch) is arranged between the sun gear 3 and the internal gear 5. The main clutch 19 has a plurality of inner friction plates 19a axially movably engaged with the sun gear 3 and a plurality of outer friction plates 19b axially movably engaged with the internal gear 5 alternately in the axial direction. And is provided between the right end surface of the pinion gear 13 and the flange portion 5a (side wall) of the internal gear 5. The friction plates 19a and 19b are provided on the inner surface of the left side wall 1a of the differential case 1 and the flange portion 5a of the internal gear 5.
It may be provided between and.

A cam ring 21 is arranged on the outer periphery of the boss portion 5b of the internal gear 5, and a multi-plate pilot clutch 23 is arranged between the cam ring 21 and the differential case 1. The pilot clutch 23 includes a plurality of inner friction plates 23a axially movably engaged with the spline portions 21a of the cam ring 21 and a plurality of outer friction plates 23b axially movably engaged with the spline portions 1b of the differential case 1. Are alternately arranged in the axial direction.

A ball cam 25 is formed between the cam ring 21 and the flange portion 5a of the internal gear 5, and a bearing 27 for receiving the cam thrust force is provided between the right side wall 1C of the differential case 1 and the cam ring 21. Has been.

An armature 29 is arranged on the left side of the pilot clutch 23, and is positioned by a snap ring 31 of a permanent magnet mounted on the inner circumference of the differential case 1.
A ring-shaped electromagnet 33 is arranged on the right side of the right side wall 1C of the differential case 1. The electromagnet 33 includes a coil 35 and a yoke 37. The yoke 37 is rotatably supported by a boss 1d of the differential case 1 via a bearing 39 and is prevented from rotating by a supporting member. Right side wall 1C
The short circuit of the magnetic flux of the electromagnet 33 is prevented in the armature 29
A stainless steel ring 41 for guiding to is welded.

A pilot clutch 23 and a ball cam 25 for amplifying the fastening force of the pilot clutch 23.
The (cam) and the electromagnet 33 that fastens the pilot clutch 23 constitute fastening means that fastens the main clutch 19 (friction clutch).

The fastening means may be arranged inside or outside the differential case 1, and the pressing member (internal gear in this embodiment) may be directly or via a rod or the like by a fluid pressure such as hydraulic pressure. It may be operated.

Thus, the differential limiting mechanism 43 is constructed.

When the electromagnet 33 is excited, a magnetic flux is generated, the armature 29 is attracted, the pilot clutch 23 is engaged, and the cam ring 21 is connected to the differential case 1. In this state, the differential torque of the differential mechanism 15 is applied to the ball cam 25, and the cam thrust force causes the internal gear 5 to move.
The main clutch 19 is pressed and engaged via. In this way, the differential force of the differential mechanism 15 is limited by the engagement force of each clutch 19, 23.

In the above embodiment, the main clutch is arranged between the sun gear and the internal gear. However, the main clutch may be arranged between the sun gear and the differential case. It may be arranged between the gear and the differential case.

[0036]

According to the differential limiting device of the first aspect, the carrier for supporting the conventional pinion gear can be omitted.

Therefore, the number of parts can be reduced and the cost can be reduced.

Further, the space for omitting the carrier is reduced, and the size can be reduced mainly in the axial direction.

Further, since the carrier is eliminated, the tooth width of each gear can be made sufficient, and the strength and durability of the gear are improved.

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 friction clutch is disposed between the sun gear and the internal gear and adjacent to the end face of the pinion gear and the side wall of the internal gear. Since it is arranged,
Since it is not necessary to separately provide an engaging member for the friction clutch, the friction clutch can be arranged with a simple structure, and a large differential limiting force can be obtained.

A differential limiting device according to a third aspect is the differential limiting device according to the first aspect, wherein the engaging means is a pilot clutch, and a cam for amplifying the engaging force of the pilot clutch.
It is composed of an electromagnet that engages the pilot clutch.

Therefore, the same effect as the differential limiting device according to the first aspect is provided.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of a differential limiting device according to a conventional example.

[Explanation of symbols]

 1 differential case 3 sun gear 5 internal gear 5a flange part (side wall) 11 storage hole 13 pinion gear 15 differential mechanism 19 main clutch (friction clutch) 23 pilot clutch (fastening means) 25 ball cam (fastening means) 33 electromagnet (fastening means) means)

Claims (3)

[Claims] 1. A differential case which is rotated by a driving force of an engine, a sun gear and an internal gear which are rotatably arranged in the differential case, and a sun gear and an internal gear which are slidably and rotatably housed in a housing hole of the differential case. A differential mechanism having a meshing pinion gear, a friction clutch arranged between any two of the three members of the differential case, the sun gear, and the internal gear, and the differential of the differential mechanism are controllably limited. And a fastening means for fastening the friction clutch. 2. The differential limiting device according to claim 1, wherein:
The differential limiting device, wherein the friction clutch is disposed between the sun gear and the internal gear, and is disposed adjacent to an end face of the pinion gear and a side wall of the internal gear. 3. The differential limiting device according to claim 1, wherein:
A differential limiting device characterized in that the engaging means comprises a pilot clutch, a cam for amplifying an engaging force of the pilot clutch, and an electromagnet for engaging the pilot clutch.