JPS6127809Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operating device for a wet multi-disc brake.

In conventional actuating devices of this type, the brake chamber had a large capacity because it was necessary to provide a margin for the piston stroke to compensate for wear.
Also, tighten the oil supply circuit b of the brake chamber c.
Because the tank was filled with air, replenishment was slow and it took a lot of time to vent the air.

The present invention was devised in view of the above circumstances, and its purpose is to eliminate the need for a large-capacity brake chamber, and to use a wet brake system in which oil replenishment for wear compensation is slow. An object of the present invention is to provide a multi-disc brake actuating device.

The present invention will now be described with reference to FIG.

In the drawing, 1 is an air chamber, and a hydraulic cylinder 2 is connected to this air chamber 1. The piston 3 in the air chamber 1 and the piston 4 in the hydraulic cylinder 2 are connected to each other by a rod 5. Further, a spring 6 is interposed between the stepped portion 1a of the air chamber 1 and the piston 3. Reference numeral 7 in the drawing indicates an oil replenishment tank, and the oil replenishment tank 7 is connected to the oil pressure generation side of the hydraulic cylinder 2 via a replenishment circuit 8, and this replenishment circuit 8 is provided with a check valve 9 and a throttle 10. .

In the drawing, reference numeral 11 denotes a compensation cylinder device, and this compensation cylinder device 11 includes a cylinder portion 12 and a chamber portion 13 having a smaller diameter than the cylinder portion 12. The cylinder portion 12 includes a piston 14.
is slidably provided.

The piston 14 has the first and second parts of the cylinder part 12.
A through hole 15 communicating with the pressure chambers 12a and 12b is provided.
A check valve 16 is provided that allows oil to pass only into the pressure chamber 12b.

The second pressure chamber 12b communicates with a chamber portion 13, and this chamber portion 13 communicates with the hydraulic cylinder 2 via a pipe 17.

Further, the second pressure chamber 12b communicates with a brake cylinder 20 of the brake 19 via a pipe 18.

A stopper 21 for fixing the piston 14 to the end of the cylinder part 12 is provided in the cylinder part 12 so as to be removable.

The brake cylinder 20 of the brake 19 is provided with an air vent plug 22.

Then, the stopper 21 is pulled out and the piston 14 is made movable.

Even if the wear of the disc increases, the combination of the cylinder part 12 and the piston 14 will keep the brake piston 19
When a certain amount of return is measured, no more oil returns to the hydraulic cylinder 2, and the brake chamber receives oil from the oil supply tank 7 and returns to its normal position.

Therefore, even if the disc wear progresses, as long as the brake chamber capacity is slightly larger than the piston stroke S, the brake will operate.

Further, when the stopper 21 is actuated to fix the piston 14 and the pistons 3 and 4 are reciprocated, the check valve 9 is closed due to the left movement of the pistons 3 and 4, and oil is supplied to the brake cylinder 20 and the cylinder portion 12 is closed. The air passes through the check valve 16 and is discharged from the air vent plug 22.

The present invention has been described in detail above, and the piston 14 is inserted into the cylinder part 12 to prevent the cylinder part 12 from being damaged.
The interior is divided into a first pressure chamber 12a and a second pressure chamber 12b, and a through hole 15 is provided in the piston 14.
A check valve 16 that allows flow to pass only on the b side is provided, and a stopper 21 for fixing the piston 14 to the cylinder portion 12 is provided so as to be removable.
2 communicates with the hydraulic pressure generation side of the hydraulic cylinder 2 via piping, and the cylinder part 1
This is characterized in that the second pressure chambers 12b of No. 2 are communicated with the brake cylinder 20 via piping.

Therefore, pull out the stopper 21 and remove the piston 1.
If the wear of the disc increases when the cylinder part 4 is made movable, even if the wear of the disc increases, the cylinder part 1
2 and the piston 14, if the piston of the brake cylinder 20 returns a certain amount, no more oil will return to the hydraulic cylinder 2, and the brake chamber will receive oil from the oil supply tank 7 and return to its normal position. Therefore, even if the disc wears out, the brake will operate as long as the brake chamber capacity is slightly larger than the piston stroke S, and there is no need for a large capacity brake chamber.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a conventional wet multi-disc brake actuating device, and FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention. 2 is a hydraulic cylinder, 12 is a cylinder section, 14 is a piston, and 16 is a check valve.

Claims (1)

[Scope of utility model registration request] A piston 14 is inserted into the cylinder part 12 to divide the cylinder part 12 into a first pressure chamber 12a and a second pressure chamber 12b, a through hole 15 is provided in the piston 14, and the first pressure chamber 12a is provided in the through hole 15. A check valve 16 is provided to allow flow only from the side to the second pressure chamber 12b side, and the piston 1 is installed in the cylinder portion 12.
A stopper 21 for fixing 4 is provided in a removable manner and communicates the first pressure chamber 12a of the cylinder section 12 with the hydraulic pressure generation side of the hydraulic cylinder 2 via piping, and the second pressure chamber 12b of the cylinder section 12 via piping. An operating device for a wet multi-disc brake, characterized in that the brake cylinder 20 is connected to the brake cylinder 20.