JPH0247777Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a wet disc brake device used in the power line of an industrial vehicle.

Conventional technology The conventional brake device of this type was developed in 1982.
- As disclosed in Publication No. 67135, it is equipped with a disc brake part c in which a fixed side plate a and a movable side plate b are overlapped, and the parking side piston is moved to move the fixed side plate a to the movable side plate. A cam mechanism was used as a means of moving this parking-side piston.

Problems that the invention aims to solve However, this cam mechanism had a complicated structure and required a large number of machining steps, resulting in poor productivity.

Purpose of the invention This invention was made in view of the above circumstances.
The purpose of this is to simplify the structure by constructing the moving means of the parking side piston with a chamfered part formed on the outer peripheral edge of the parking side piston and a ball, thereby improving productivity and making the entire brake device more compact in the axial direction. It's about doing.

Means and Effects for Solving the Problems In order to achieve the above object, the present invention operates the main braking side piston 31 to press the movable side plate 13 to the fixed side plate 11 to obtain main braking. In this brake device, the parking side piston 16 is actuated to press the movable side plate 13 to the stationary side plate 11 to obtain parking braking. A plurality of chamfered portions 21 are provided at predetermined intervals in the circumferential direction on the outer peripheral edge of the back surface of the housing 2.
A ball 23 is rotatably provided in a recess 22 provided in the housing 2, and the ball 23 is inserted into the chamfered portion 21, and a rotation imparting means for imparting rotation to the parking side piston 16 is provided in the housing 2.

Then, by applying rotation to the parking side piston 16 by the rotation applying means, the ball 23 comes into contact with the end side from the center of the chamfered part 21, and the parking side piston 16 moves in the axial direction, and passes through the main braking side piston 31 to the stationary side plate. 11 and the movable plate 13 is pressed against the movable side plate 13 to perform parking braking.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes an axle shaft, and a housing 2 is fixed to the axle shaft 1, and a hub 4 is provided on the axle shaft 1 via a bearing 3. The housing 2 has an outer body 5
are fastened with bolts 6, and the inner circumferential portion 5a of this outer shell 5 is in sliding contact with the outer circumferential surface of the hub 4 via a seal member 7. An inner shell 8 is fastened to the hub 4 with bolts 9.

A spline 10 extending along the axial direction is formed on the inner circumference of the outer body 5, and a fixed side plate 11 is provided on the spline 10 so as to be movable in the axial direction. Further, a spline 12 along the axial direction is provided on the outer circumference of the inner body 8, and this spline 12
Rotating side plates 13 are provided so as to be movable in the axial direction, and these rotating side plates 13 are inserted between the fixed side plates 11.

Further, a stopper 14 is provided on the inner circumference of the outer shell 5.

A cylinder portion 15 is formed on the inner surface of the housing 2, and a parking side piston 16 is provided in the cylinder portion 15 so as to be rotatable and movable in the axial direction. And parking side piston 16
A plurality of holes 18 are provided in the base plate portion 17 of the board 17, and a guide bolt 19 is attached to the housing 2 by passing through the hole 18. A return spring 20 is provided on the guide bolt 19. The spring 20 presses the parking side piston 16. Further, a plurality of chamfered portions 21 are formed on the outer peripheral edge of one end surface of the parking side piston 16 at predetermined intervals in the circumferential direction. A ball 23 inserted into a recess 22 on the inner surface of the housing 2 is inserted into these chamfered portions 21 . Further, a gear 24 is formed on the inner peripheral portion of the parking side piston 16.

The housing 2 is provided with a support hole 25 , and a shaft 27 of a gear 26 is rotatably supported in the support hole 25 , and the gear 26 meshes with the gear 24 . A parking lever 28 is attached.

A stepped portion 29 is formed on the inner surface of the housing 2, and the parking side piston 1 is connected to the stepped portion 29.
A cylinder portion 30 is formed by the outer circumferential surface 16a of 6.

A main braking side piston 31 is fitted into this cylinder portion 30, and an end surface 31a of this main braking side piston 31 is in contact with the fixed side plate 11, and a gap between this main braking side piston 31 and the inner shell 8 A spring 32 is then inserted.

A wheel 34 is attached to the hub 4 by hub bolts 33, and the hub is connected to a torque shaft 35.

Further, the housing 2 is provided with a port 36 that opens into the cylinder portion 30.
is connected to a supply/discharge pipe 37.

Next, the operation will be explained.

The rotation of the torque shaft 35 is transmitted to the wheel 34 via the hub 4. When performing main braking, pressurized oil is supplied from the supply/discharge pipe 37 to the cylinder section 30 through the port 36 to return the main braking side piston 31 and move it against the spring 32 to move the fixed side plate 11. This is done by pressing the side plate 13 and locking the wheel 34.

Also, when operating the parking brake, the parking lever 28 is operated to rotate the gear 26, and the rotation of the gear 26 causes the parking side piston 1 to rotate.
6 and attach the ball 2 to the end side of the chamfered portion 21.
3, the parking side piston 16
The main braking side piston 31 is moved via the parking side piston 16 to press the fixed side plate 11 to the movable side plate 13 and lock the wheel 34.

Although gears 24 and 26 are used as means for rotating the parking side piston 16, as shown in FIG.
8 and a protrusion 3 protruding from the parking side piston 16
Alternatively, a ball 40 may be interposed between the parking lever 28 and the parking lever 28 to rotate the parking side piston 16 via the lever 38 and the ball 40 and the protrusion 39.

Effects of the Invention As detailed above, the brake device for an industrial vehicle according to the present invention operates the main braking side piston 31 to press the movable side plate 13 to the stationary side plate 11 to obtain main braking and also performs parking. In a brake device that operates the side piston 16 and presses the movable side plate 13 to the fixed side plate 11 to obtain parking braking, the parking side piston 16 is provided on the back side of the main braking side piston 31, and the parking side piston 16 is A plurality of chamfered portions 21 are provided at predetermined intervals in the circumferential direction on the outer peripheral edge of the back surface, a ball 23 is provided in a recessed portion 22 provided in the housing 2 so as to be freely rollable, and the ball 23 is inserted into the chamfered portion 21, The present invention is characterized in that the housing 2 is provided with rotation imparting means for imparting rotation to the parking side piston 16.

Therefore, by applying rotation to the parking side piston 16 by the rotation applying means, the ball 2
3 touches the end side from the center of the chamfered portion 21, and the parking side piston 16 moves in the axial direction to press the movable side plate 13 to the fixed side plate 11 via the main braking side piston 31 to perform parking braking. can.

In this way, simple parts such as the chamfered part 21 and the ball 23 are used as the means for moving the parking side piston 16, and the chamfered part 21 can be easily machined, so productivity can be improved. Since the chamfered portion 21 is arranged on the back side of the parking side piston 16, the entire brake device becomes compact in the axial direction.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted vertical sectional view of an embodiment of the present invention, Fig. 2 is a front view of the parking side piston,
3 is a view taken from the direction of FIG. 2, FIG. 4 is a view taken from the direction of FIG. FIG. 6 is an explanatory diagram of the respective pushing directions for main braking and parking in a conventional brake device. 11 is a fixed side plate, 13 is a movable side plate, 16 is a parking side piston, 21 is a chamfered portion, and 23 is a ball.

Claims (1)

[Scope of utility model registration request] The main braking side piston 31 is actuated to press the movable side plate 13 to the fixed side plate 11 to obtain main braking, and the parking side piston 16 is actuated to press the movable side plate 13 to the fixed side plate 11 to obtain parking braking. In the brake device, a parking side piston 16 is provided on the back side of the main braking side piston 31, and a plurality of chamfered portions 21 are provided on the outer peripheral edge of the back surface of the parking side piston 16 at predetermined intervals in the circumferential direction. , a ball 23 is rotatably provided in a recess 22 provided in the housing 2, and the ball 23 is inserted into the chamfered portion 21;
A brake device for an industrial vehicle, characterized in that the housing 2 is provided with rotation imparting means for imparting rotation to the parking side piston 16.