JPH01278841A - Differential limiting device - Google Patents

Abstract

PURPOSE:To make a transfer member miniaturizable by performing the forced release of a braking limit with the transfer member interrupting any linkage between an output shaft and a plate. CONSTITUTION:A clutch differential mechanism 20 consists of a first plate 21 installed as one body with a front-wheel shaft 5, a second plate 22 being opposed to this first plate 21 and parallelly set up in the axial direction of the front-wheel shaft 5 and a ball 23 set up between these first and second plates 21 and 22. The second plate 22 is made connectible to a rear-wheel shaft 7 via a section U-shaped transfer member 25 and a ring gear 4. This transfer member 25 is coupled with the second plate 22 through a spline, and it is made free of displacement in the axial direction.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an improvement in a differential limiting device.

(Prior art) For example, in a so-called four-wheel drive vehicle in which both the front and rear wheels are driven, a center differential is provided between the front axle and the rear axle. It is designed to absorb the difference in rotation. When a center differential is used, if even one wheel spins, driving force will not be transmitted to the other wheels due to the operation of the center differential, so it is customary to install a differential limiting device such as a differential lock or limited slip mechanism. There is.

Among this type of differential limiting devices, one is known that uses balls to automatically control differential limiting, as seen in Japanese Patent Publication No. 57-1699. This has the great advantage of not increasing the size of the center differential.

(Problem to be solved by the invention) However, in devices such as this that automatically control the differential of the differential limiting mechanism using balls, the differential is always limited automatically as a matter of course. Therefore, when it is necessary to forcibly cancel the differential restriction based on other requests, it is necessary to separately provide a differential restriction forced release mechanism. and,
An important technical issue with this forced release mechanism is that it does not increase the size of the center differential.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a differential limiting device that can be equipped with a differential restriction forced release mechanism without increasing the size of the differential limiting device using balls as much as possible.

(Means and operations for solving the problem) In order to achieve the technical problem described in E, the present invention includes a clutch provided between two output shafts of a differential gear, and a clutch that engages and engages the clutch. one actuator, the first actuator is one of the two output shafts,
A first plate connected to one output shaft; and a second plate connected to another output shaft and capable of approaching and separating from the first plate.

a ball disposed between the first and second plates; and a recess formed on opposing surfaces of each of the first and second plates to receive the ball; A transmission member between one output shaft and the $1 plate or between the other output shaft and the second plate, which connects and disconnects the output shaft and the plate, and actuates the transmission member. In this configuration, a second actuator is provided.

With the above configuration, the forced release of the braking restriction is basically performed by the transmission member that connects and disconnects the output shaft and the plate.

This transmission member only needs to be able to connect and disconnect the output shaft and the plate, so there is no need for it to be a separate large member. Therefore, even if this transmission member is newly installed, it will immediately increase the size of the device. It will never get through.

(Example) Embodiments of the present invention will be described below based on the drawings.

This embodiment shows an example in which the present invention is applied to a center differential disposed between a front axle and a rear axle in a four-wheel drive vehicle in which both front wheels and rear wheels are driven. That is, as shown in Fig. 2, 1 is the center differential 1, 100 is the transmission, 1
01 is a front differential, 102 is a 7-inch drive shaft, and 103 is a rear drive shaft.

To explain the center differential l, as shown in Fig. 1, the center differential l is composed of a planetary gear mechanism provided in the differential case 1a, and is connected to the input shaft 2 from the engine side.
is connected to a pinion gear 4 via a carrier 3, and this pinion gear 4 is disposed inscribed in a sun gear 6 provided on a front wheel axle 5 and a ring gear 8 connected to a rear wheel axle 7. A center differential with such a configuration has the following features:
A differential lock mechanism 10 is provided to limit the differential mechanism between the front wheel axle 5 and the rear wheel axle 7.

The differential lock mechanism 10 is basically composed of a multi-disc clutch, and this multi-disc clutch lO is used for the center differential lO.
are arranged side by side on one side. That is, the multi-plate clutch 10
A cylinder 11 in which one clutch element is integrated with the front wheel axle 5
, and other clutch elements are connected to an outer cylinder 12 that is integrated with the ring gear 8. The differential mechanism 20 of this multi-stage clutch 10 is configured as follows.

The clutch differential mechanism 20 basically includes a first play (21) integrally provided on the front wheel axle 5, and a first play (21) disposed side by side in the axial direction of the front wheel axle 5, facing the first play (21). second
plate 22, and a ball 23 disposed between the first and second plates 21 and 22. The first and second plates 21 and 22 are provided with recesses 21a and 22a on their opposing surfaces to receive the ball 23,
Further, the second plate 22 is freely displaceable in the axial direction,
This second plate 22 is integrally connected to the multi-disc clutch 10 and is urged toward the first plate 21 by a spring 24.

The second plate 22 includes a transmission member 25 having a U-shaped cross section.
, and is connected to the rear wheel shaft 7 via the ring gear 4. That is, the transmission member 25 is connected to the outer cylinder 12.
The transmission member 25 is disposed in a space sandwiched between the outer cylinder 12 and the stepped portion 26 extending in the radial direction between the outer cylinder 12 and the ring gear 4, with the bottom wall portion 25a of the transmission member 25 facing the stepped portion 26. The transmission member 25 is spline-coupled to the second plate 22 and is movable in the axial direction (direction of arrow X in the figure). The transmission member 25 is displaced in the direction of arrow X in the figure by a magnet 28 as an actuator, and the magnet 28 is disposed in the internal space of the transmission member 25. A differential lock forced release mechanism 29 is configured. In addition, the reference numeral 30 in the figure is a bracket, and this bracket 30 allows the magnet 28 to be attached to the differential case 1a.
installed on.

The magnet 28 is turned ON10FF by a signal from the control unit U, and the control unit U receives an activation signal from an anti-skid device that prevents the wheels from locking during braking, for example.
When the anti-skid device is in an operating state, a signal is output to the magnet 28 to move the transmission member 25 to the left in the figure, and when the anti-skid device is in an inoperative state, a signal is output to the magnet 28 to move the transmission member 25 to the left in the figure. A signal is output to the magnet 28.

With the above configuration, when the transmission member 25 moves to the left in the figure, the second plate 22 and the ring gear 8 are integrated via the transmission member 25.

As a result, force from the rear wheel shaft 7 is input to the second plate 22 . And in this state,
If either the front or rear wheels spin,
A relative displacement occurs between the plate 21 and the second plate 22 in the circumferential direction, and as a result, the ball 23 rides up from the recess 21a or 22a, and as a result, the second plate 22 separates from the first plate 21. As a result, the multi-disc clutch 10 is turned on. That is,
When the second plate 22 and the ring gear 8 are integrated via the transmission member 25, when either the front wheel or the rear wheel slips, the multi-disc clutch 10 is automatically turned ON, and the The wheel axle 5 and the rear wheel axle 7 are now in a directly connected state (differential lock state).

On the other hand, when the transmission member 25 moves to the left in the figure, the transmission member 25 connects the second plate 22 with the ring gear 8.
As a result, the input from the rear wheel shaft 7 to the second plate 22 is released. Therefore, this second plate 22 follows the first plate 21, and the aforementioned ball 23 is forced to fg. Therefore, the differential lock state described above is forcibly released by the leftward movement of the transmission member 25 in the figure.

Further, in this embodiment, the L transmission member 25 is the second transmission member 25.
It is possible to consider that the portion connecting the plate 22 and the ring gear 8 is divided and the transmission member 25 is placed there, so that the center differential case 1a does not need to be significantly enlarged. Further, the transmission member 25 is simply
2. It is sufficient as long as it can interrupt the connection with 8.
It only needs to be small, so it can be operated quickly.

(Effects of the Invention) As is clear from the following description, according to the present invention, a differential restriction forced release mechanism can be attached to the differential restriction device without significantly increasing its size. Since a small transmission member is sufficient, the operation can be performed quickly.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a center differential of a four-wheel drive vehicle according to the present invention, and FIG. 2 is a skeleton diagram showing a drive path of the four-wheel drive vehicle. 1: Center differential 2: Input shaft 4: Binion gear 5: Front wheel shaft 6: Sun gear 7: Rear wheel shaft 8: Ring gear 10: Differential lock mechanism (multi-plate clutch) 20: Clutch actuation mechanism (first actuator) 21: First plate 22: Second plate 23: Ball 25: Transmission member 28: Magnet (second actuator) 21: Differential lock forced release mechanism

Claims (1)

[Claims] (1) It has a clutch provided between two output shafts of a differential device, and a first actuator that connects and disconnects the clutch, and the first actuator is one of the two output shafts.
a first plate connected to one output shaft; a second plate connected to another output shaft and capable of approaching and separating from the first plate; a ball disposed between two plates; and a recess formed on each opposing surface of the first and second plates to receive the ball; A transmission member that connects and disconnects the output shaft and the plate either between the first plate or between another output shaft and the second plate, and a second actuator that operates the transmission member. A differential limiting device comprising: