JPH045379Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle differential lock device suitable for locking a differential case and an axle shaft.

[Conventional technology]

Large vehicles such as trucks are equipped with a differential lock device that locks the relative rotation of left and right axle shafts connected to side gears of a differential device to drive both left and right wheels as one unit when driving on rough roads.

Conventionally, this type of device includes, for example, a clutch gear provided on each axially opposing surface of the differential case and the axle shaft, an annular groove formed on the outer peripheral surface of the clutch gear on the axle shaft side, and a tip of a shift fork inserted into the annular groove. the base end of the shift fork is rotatably fixed via a pin, a lever is fixed to the base end of the shift fork, and an actuator for rotating the lever is arranged in the axle housing, The lever is rotated by the operation of the actuator, and the axle shaft and the differential case are locked through the clutch gear by the shift of the shift fork, and the one described in Utility Model Publication No. 15011/1983. Proposed.

[Problem that the invention attempts to solve]

However, in conventional devices, the shift fork was configured to shift according to the operation of the actuator, which caused problems such as excessive force being applied to the tip of the shift fork during shifting, resulting in wear of the tip of the shift fork. It was hot.

[Purpose of invention]

The present invention has been devised in view of the above-mentioned conventional problems, and its purpose is to provide a vehicle defrock device that can prevent wear of the tip of the shift fork.

[Means for solving problems]

In order to achieve the above object, the present invention provides a clutch gear on each axially opposing surface of the differential case and the axle shaft, forms an annular groove on the outer peripheral surface of the clutch gear on the axle shaft side, and inserts the tip of the shift fork into the annular groove. and fix the base end of the shift fork rotatably via the pin,
A pair of levers are fixed integrally to the base end of the shift fork, facing each other across the shift fork, and the shift fork is wrapped with a return spring that accumulates a biasing force in the direction of preventing each lever from rotating. The axle housing facing each lever is equipped with an actuator that rotates each lever using air pressure when it comes into contact with one of the levers in response to an operation.
In a vehicle differential lock device that locks an axle shaft and a differential case via a clutch gear by shifting a shift fork through the rotation of each lever in conjunction with the operation of an actuator, a portion of the axle housing facing the other lever is provided with a portion of the axle housing that faces the other lever. This configuration has a fixed adjustment screw that regulates the amount of movement of the other lever by contact with the other lever.

[Effect of invention]

When the actuator operates, each lever rotates as the actuator operates, the shift fork shifts due to the rotation of each lever, and the axle shaft and differential case are locked via the clutch gear. At this time, the amount of movement of the other lever is regulated by contacting the adjustment screw, and it is possible to prevent excessive force from being applied to the tip of the shift fork.

[Example of idea]

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

1 to 3 show the configuration of a preferred embodiment of the present invention. In the figure, clutch gears 14 and 16 are disposed on opposing surfaces of the differential case 10 and the axle shaft 12 in the axial direction. And axle shaft side clutch gear 16
An annular groove 18 is formed on the outer circumferential surface of the shift fork 20 , and a tip of a shift fork 20 is inserted into the annular groove 18 via a pin 22 . shift fork 2
0 is rotatably fixed to an axle housing 26 via a pin 24. Further, a pair of levers 28 and 30 are integrally fixed to the base end of the shift fork 20, and are arranged opposite to each other with a pin 24 (the axis of the shift fork 20) as a boundary. Further, a return spring 32 is wound around the outer circumferential side of the pin 24 at the base end of the shift fork 20, and accumulates a biasing force in a direction to prevent the levers 28, 30 from rotating.

An actuator 34 is provided at a portion of the axle housing 26 facing the lever 28.
In response to the operation, the actuator 34 introduces air from the air inlet 36 to actuate the diaphragm 38 to move the shaft 40 in contact with the lever 28 in the direction of arrow X, thereby rotating the lever 28 about the pin 24. At the same time, the shift fork 20 integrated therewith is rotated in the direction of arrow Y.

Further, an adjustment screw 42 is attached to a portion of the axle housing 26 facing the lever 30. The length of the adjustment screw 42 that protrudes in the axial direction changes by rotating the screw head 42A, and the amount of movement of the lever 30 when the lever 30 is rotated is regulated by contact with the lever 30. It's summery. Note that 42B is a nut that maintains and fixes the adjustment screw 42 in that state after adjusting it. Further, a portion of the axle housing 26 near the actuator 34 is provided with a structure that prevents the oil in the axle housing 26 from being discharged outside the axle housing 26 and communicates the inside and outside of the axle housing 26, allowing only air to pass through. A breather 44 is provided to cause the

In the above configuration, when the actuator 34 is actuated in response to an operation, the shaft 40 moves in the direction of the arrow X, and the levers 28 and 30 rotate,
The shift fork 20 shifts in the direction of arrow Y.
With this, axle shaft 12 and differential case 1
0 is locked via clutch gears 14 and 16. At this time, if the lock state is adjusted to the optimum state by adjusting the adjustment screw 42, the shift amount of the shift fork 20 is adjusted by the contact between the adjustment screw 42 and the lever 30, and the tip of the shift fork 20 After the shift is completed, the pin 22 of the lever 3
0 and the adjustment screw 42, transmission of force from the actuator 34 can be prevented, and the tip of the shift fork 20 can be prevented from being worn out.

Furthermore, in this embodiment, the stroke of the shift fork 20 can be adjusted by adjusting the adjustment screw 42, so the actuator 34 can be used for general purposes.

[Effect of idea]

As explained above, according to the present invention, the stroke of the shift fork is adjusted by the adjustment screw provided on the axle housing, which prevents too much force from being applied to the tip of the shift fork. An excellent effect can be obtained in that it is possible to prevent the tip of the fork from being worn out, and it can contribute to improving the wear resistance of the shift fork.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention;
2 is a side view taken along the - line in FIG. 1, and FIG. 3 is a sectional view taken along the - line in FIG. 1. 10... Differential case, 12... Axle shaft, 14, 16... Clutch gear, 20... Shift fork, 28, 30... Lever, 34... Actuator, 42... Adjustment screw.

Claims (1)

[Scope of utility model registration request] A clutch gear is provided on each axially opposing surface of the differential case and the axle shaft, an annular groove is formed on the outer peripheral surface of the clutch gear on the axle shaft side, and the tip of the shift fork is inserted into the annular groove, and the base end of the shift fork is inserted. is rotatably fixed via a pin, and a pair of levers are integrally fixed to the base end of the shift fork so as to face each other across the shift fork, and each lever is prevented from rotating on the shift fork. The axle housing facing each lever is equipped with a return spring that accumulates a biasing force in the direction of the lever, and an actuator that rotates each lever using air pressure when it comes into contact with one of the levers in response to an operation. In a vehicle differential lock device that locks an axle shaft and a differential case via a clutch gear by shifting a shift fork by rotating each lever in conjunction with the operation of an actuator, one lever is attached to a portion of the axle housing facing the other lever. 1. A vehicle defrock device, characterized in that an adjustment screw is fixed for regulating the amount of movement of the other lever by contact with the other lever.