JPH0488240A - Limited slip differential gear - Google Patents

Abstract

PURPOSE:To facilitate the differential revolution at low revolution and improve operation performance by installing the first and second springs and installing each revolution suppressing part between a weight pat and a differential pinion gear and between the differential pinion gear and a differential gear case. CONSTITUTION:In case of a low car speed, the weight parts 14-1 and 14-2 are applied with each small centrifugal force, and pressed in the outside direction by the urging power of the first spring 16, and the frictional surface parts 26-1 and 26-2 of the first revolution suppressing part 20-1 and the surface members 28-1 and 28-2 slidingly move. In case of high car speed or stuck state, the centrifugal force increases, and the weight parts 14-1 and 14-2 shift to the outside, and press the second springs 18-1 and 18-2, and differential pinion gears 10-1 and 10-2 are pressed on the surface members 30-1 and 30-2 of the second revolution suppressing part 20-2. Then, the sliding frictional force between the first and second revolution suppressing parts 20-2 and 20-1 suppresses the revolution around the differential pinion shaft 8 of the differential pinion gears 10-1 and 10-2.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a limited slip differential gear, and in particular compensates for the drawback of a normal differential gear in that its running performance is reduced, and also has the performance of a normal differential gear. Regarding limited slip differential gears.

[Prior Art] Differential gears include front differential gears and differential gears.This ordinary differential gear is used to drive a car onto a road surface with a low coefficient of friction, such as muddy ground, sandy ground, or frozen road. The disadvantage is that when the wheel slips and becomes unable to escape, or when one wheel temporarily leaves the road surface and touches the ground again during a turn, it causes a swaying condition and reduces driving performance. It is something.

For this reason, a limited slip differential gear (differential damping device, LSD) has been developed that compensates for the above-mentioned drawbacks and also has the performance of a normal differential gear.

This limited slip differential gear is the third
As shown in the figure, a differential case 106 rotates by driving force from an engine (not shown), a differential pinion shaft 108 supported by the differential case 106, and a pair of differential pinion gears rotatably supported at both ends of the differential pinion shaft 108. 110-1, 110-2, and a differential pinion gear 110-1 housed in the differential case 106.
．． A pair of differential side gears 11 meshing with 110-2, respectively.
2-1.112-2.

And a pair of differential side gears 112-1.112-2
A multi-disc clutch 14 is attached to one differential side gear 112-1.
0 is provided, differential side gear 112-1.112-2
Due to the thrust force when the and differential pinion gear 110-1, 110-2 rotate, and the pressing force of the cam (not shown) on the differential pinion shaft 108, the differential side gear 112-1, 112-2 and the differential case are 106 is suppressed.

A viscous coupling is provided at the multi-disc clutch portion.

In addition, as shown in FIG. 4, a normal differential gear includes a differential case 206 that rotates by driving force from an engine (not shown), a differential pinion shaft 208 supported by the differential case 206, and a rotating shaft at both ends of the differential pinion shaft 208. A pair of differential pinion gears 210-1 and 210-2 that are movably supported, and the differential case 20
The differential pinion gear 210-1.210-
A pair of differential side gears 212-1.2 meshing with 2, respectively.
12-2.

A differential case 206 is driven by a final gear 204 in this ordinary differential gear 202, and the differential gear 202 rotates around a drive shaft (not shown). At this time, the rotation of the differential case 206 causes the differential pinion shaft 208 and the differential pinion gears 210-1,'
210-2 rotates around the drive shaft and drives the differential side gear 212-1.212-2 that meshes with the differential pinion gear 210-1.210-2. Drive shafts (not shown) are connected to the differential side gears 212-1 and 212-2 on the left and right sides, respectively, and the left and right wheels (not shown) are rotated by these drive shafts. At this time, when a torque difference occurs between the left and right drive shafts, the differential pinion gear 210-1.210-2 begins to rotate around the differential pinion shaft 208, and the differential side gear 212-1.212-2 differentially rotates. It is.

Further, as the limited slip differential gear, there is one disclosed in Japanese Patent Publication No. 63-33574. The limited slip differential gear disclosed in this publication is equipped with a multi-disc clutch mechanism that limits the differential movement of both side gears, and has two different cam angles and a multi-disc clutch mechanism that controls the rotational drive input direction. A cam force mechanism that applies different cam force to the mechanism improves straight-line running stability and reduces the tendency for understeer when turning, without having to prepare multiple pairs of cam force mechanism combinations or changing the combinations. In addition to achieving both control and control, the design also aims to both ensure drivability when moving forward and improve the ability to escape from a stuck position when reversing.

[Problems to be Solved by the Invention] However, in the conventional limited slip differential gear, it is necessary to provide a multi-disc clutch on one differential side gear, which complicates the configuration, makes manufacturing difficult, and increases cost. It is economically disadvantageous, and
The limited slip differential gear has become larger,
This method requires a large installation space, which is disadvantageous in practice.

In addition, in a normal differential gear, as mentioned above (generally, when one of the drive wheels slips on a road surface with a low coefficient of friction such as a muddy road, sandy road, or frozen road) and becomes unable to escape, When one wheel temporarily leaves the road surface and touches the ground again when turning, etc., a tail swinging condition is caused, which is disadvantageous in that driving performance is degraded.

[Object of the Invention] Therefore, an object of the present invention is to provide a weight portion that engages with the outer periphery of the differential pinion shaft between the differential pinion gears of the differential gear, and to provide a first weight portion that presses the weight portion in an outward direction. In addition to providing a spring, a second spring that presses the differential pinion gear inward is also provided, and rotation suppressing portions are provided between the weight portion and the differential pinion gear, and between the differential pinion gear and the differential case, so that when the differential case rotates at low speeds, To provide a limited slip differential gear which facilitates the differential operation, quickly, reliably and easily performs a turning operation, and which can share parts with a conventional differential gear not having an LSD.

[Means for Solving the Problems] In order to achieve this object, the present invention includes a differential case that rotates by driving force from an engine, a differential pinion shaft supported by the differential case, and a differential pinion shaft that is rotatable at both ends of the differential case. A differential gear having a pair of differential pinion gears supported by a pair of differential pinion gears and a pair of differential side gears housed in the differential case and meshing with the differential pinion gears, wherein a weight portion is provided that engages with the outer periphery of the differential pinion shaft between the differential pinion gears, A first spring that presses the weight portion outwardly and a second spring that presses the differential pinion gear inwardly are provided, and rotation suppressing portions are provided between the weight portion and the differential pinion gear and between the differential pinion gear and the differential case, respectively. It is characterized by having been established.

[Operations] With the above-described configuration, when the differential case is rotated by the driving force from the engine, the LS is activated according to the rotational state.
It controls the D effect, facilitates the differential movement especially at low rotations of the differential case, quickly performs turning operations reliably and easily, and uses common parts with conventional differential gears that do not have an LSD.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figure 1.2 shows an embodiment of the invention. 1st
In the figure, 2 is a limited slip differential gear (limited slip differential device, LSD).

The limited slip differential gear 2 is driven by a driving force from an engine (not shown) to the final gear 4.
A differential case 6 that rotates through the differential case 6, a differential pinion shaft 8 supported within the differential case 6, and a pair of differential pinion gears 10-1 and 10-2 rotatably supported at both ends of the differential pinion shaft 8. It has a pair of differential side gears 12-1, 12-2 which are accommodated in the differential case 6 and mesh with the differential pinion gears 10-1, 10-2, respectively.

Further, a weight portion 14 that engages with the outer periphery of the differential pinion shaft 8 between the differential pinion gears 10-1 and 10-2 is provided, and a first spring 16 that presses the weight portion 14 outward is provided. 10-1.10-2 is provided, and is provided between the weight portion 14 and the differential pinion gear 10-1.10-2 and between the differential pinion gear 10-1.10-2.
A rotation suppressing portion 20 is provided between the differential case 10-2 and the differential case 6, respectively.

More specifically, the weight portion 14 is formed of, for example, two weight portions 14-1 and 14-2, and a spline 22 is formed on the outer periphery of the differential pinion shaft 8, and the weight portion 14-L 14-2 is formed. A spline 24 is also formed on the inner periphery of the differential pinion shaft 8, and the spline 24 on the inner periphery of the weight portion 14-1.14-2 is engaged with the spline 22 on the outer periphery of the differential pinion shaft 8.

A first spring 16 is interposed between the weight portions 14-1 and 14-2, and the first spring 16 moves the weight portions 14-1 and 14-2 in the outward direction, that is, the weight portion 14-1 in the first direction. .2, and the weight part 14-2 is pressed downward in FIG. 1.2, so that the first spring 16 functions as a preload.

Further, the differential case 6 and the differential pinion gear 10-L
10-2, a second spring 18-1.1B between each
-2 respectively interposed, the second spring 18-1, 18-2
to press the differential pinion gears 10-1 and 10-2 inward, respectively.

That is, while pressing the differential pinion gear 10-1 downward in FIG. 1.2, the differential pinion gear 10-1 is pressed downward.
2 upward in FIG. 1.2, and the second spring 18-1.
It functions for positioning 0-2.

Furthermore, the first rotation suppressing portion 20-1 between the weight portion 14-1.14-2 and the differential pinion gear 10-1.10-2,
Friction surface portions 2B-1 and 26-2 adhered to weight portion 14-L 14-2 and differential pinion gear 10-1.1
The surface material 28-1.28-2 is bonded to the friction surface portion 26-1.26-2 and the surface material 28-1.2.
The sliding friction force with 8-2 becomes the rotational resistance of the differential pinion gear 10-L 10-2 during differential operation.

Further, the second rotation suppressing portion 20-2 between the differential pinion gear 10-1, 10-2 and the differential case 6 is made of a surface material 30-1, 30-2 bonded to the inner surface of the differential case 6, and the surface material 30-1 .30-2 and differential pinion gear 10-1.1
The sliding friction force with 0-2 becomes the rotational resistance during differential operation.

Note that 32-1 and 32-2 are bearings.

Next, the effect will be explained.

When the limited slip differential gear 2 is rotating at a low speed, that is, at a low vehicle speed when the limited slip differential gear 2 is used in a vehicle (not shown), the centrifugal force acting on the weight portion 14-L 14-2 is small, and the first Due to the biasing force of the spring 16, the weight portion 1
4-1 and 14-2 are each pressed outward.

Then, the weight portion 14 which is the first rotation suppressing portion 20-1
-1.14-2 friction surface portion 26-1.26-2 and differential pinion gear 10-1.10-2 surface material 28-L 2
8-2 slides, and only this sliding frictional force acts as rotational resistance for the differential pinion gears 10-1 and 10-2 during differential operation, which weakens the LSD effect and makes differential rotation easier.

Furthermore, when the limited slip differential gear 2 rotates at high speeds, that is, at high vehicle speeds or when it is stuck, the centrifugal force acting on the weight portion 14-1.14-2 becomes large, causing the weight portion 14-1.14-2 to connect to the spline 22. Move the upper part outward and remove the second spring 18-1.18-2.
to press the differential pinion gear 10- to the surface material 30-1, 30-2 of the inner surface of the differential case 6 of the second rotation suppressing portion 20-2.
1, 10-2 are pressed.

The sliding friction force between the second rotation suppressing portion 20-2 and the first rotation suppressing portion 20-1 is applied to the area around the differential pinion shaft 8 of the differential pinion gears 1ot and 10-2 during differential operation. The rotation will be suppressed, and the differential side gear 1
2-L Difficult to perform differential rotation of 12-2, strong LSD
It is proving effective.

This makes it easier for the limited slip differential gear 2 to rotate differentially at low speeds, making it possible to perform turning operations quickly, reliably, and easily, improving operability and driving performance. It is possible and has practical advantages.

In addition, by making parts such as the differential side gear 12-L 12-2 common to the conventional differential gear that does not use an LSD, the configuration is not complicated, manufacturing is easy, and costs can be kept low. This is economically advantageous, and the limited slip differential gear 2 can be maintained in the same shape as a normal differential gear, that is, small in size.

Furthermore, by automatically controlling the strength of the LSD effect according to the rotational state of the differential case θ, that is, the rotational state of the final gear 4, it is possible to make the LSD effect weak at low rotational speeds, and at the same time to make the LSD effect weak at low rotational speeds. During rotation, the LSD effect can be made strong, and usability can be improved.

[Effects of the Invention] As described in detail above, according to the present invention, a weight portion that engages with the outer periphery of the differential pinion shaft between the differential pinion gears of the differential gear is provided, and a first spring that presses the weight portion outward is provided. At the same time, a second spring that presses the differential pinion gear inward is provided, and rotation suppressing portions are provided between the weight portion and the differential pinion gear and between the differential pinion gear and the differential case.
Differential rotation of the limited slip differential gear at low rotation speeds is facilitated, turning operations can be accomplished quickly, reliably, and easily, and operability can be improved.

In addition, because parts such as a conventional differential gear that does not have an LSD and a differential side gear can be shared, the configuration is not complicated, manufacturing is easy, and costs can be kept low, which is economically advantageous. At the same time, the limited slip differential gear can be kept as small as a normal differential gear. Furthermore, the LSD effect can be automatically controlled in intensity depending on the rotational state of the differential case, thereby improving usability.

[Brief explanation of drawings]

1.2 shows an embodiment of the present invention, FIG. 1 is a schematic sectional view of a limited slip differential gear, and FIG.
The figure is an enlarged cross-sectional view of a main part of a weight part in a limited slip differential gear. 3.4 shows the prior art of the present invention, FIG. 3 is a schematic sectional view of a limited slip differential gear having a multi-disc clutch, and FIG. 4 is a schematic sectional view of an ordinary differential gear. In the figure, 2 is a limited slip differential gear (limited slip differential device, LSD), 4 is a final gear,
6 is differential case, 8 is differential pinion shaft, 10-1
．． 10-2 is a differential pinion gear, 12-1.12-2 is a differential side gear, 14-1 and 14-2 are weight parts, 1
6 is a first spring, 18-1.182 is a second spring, 20 is a rotation suppressing part, 20-1 is a first rotation suppressing part,
20-2 is a second rotation suppressing part, 22.24 is a spline,
26-1.26-2 is a friction surface portion, 28-1.28-2.
30-1.30-2 is a surface material, and 32-1.32-2 is a bearing. Figure 1/? Patent Applicant: Suzuki Motor Co., Ltd. Agent: Yoshimi Nishigo, Figure 2, Figure 4, Figure 3: Written amendment to procedure (voluntary) October 19, 1990

Claims (1)

[Claims] 1. A differential case rotated by driving force from the engine, a differential pinion shaft supported by the differential case, a pair of differential pinion gears rotatably supported at both ends of the differential pinion shaft, and a differential pinion gear housed in the differential case, respectively. In a differential gear having a pair of differential side gears that mesh with each other, a weight portion that engages with the outer periphery of the differential pinion shaft between the differential pinion gears is provided, and a first member that presses the weight portion outwardly.
A limited slip differential gear characterized in that a spring is provided and a second spring is provided to press the differential pinion gear inward, and a rotation suppressing portion is provided between the weight portion and the differential pinion gear and between the differential pinion gear and the differential case. .