JPS6429505U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a part of a first embodiment of the present invention using circuit symbols. FIG. 2 is a sectional view showing a part of a second embodiment of the present invention using circuit symbols. FIG. 3 is a partial circuit diagram showing a portion of a third embodiment of the present invention. FIG. 4 is a sectional view showing a fourth embodiment of the present invention. 1...Hydraulic motor, 2...Main switching valve, 3...Pilot hydraulic pressure source, 4...Brake cylinder, 5...
...Switching valve, 6...Pilot control valve, 7...Piston, 9...Pressure compensation spool, 11...First throttle, 12...Pressure compensation spring, 20...Brake, 21...Output shaft, 22 ...Spring, 29...Second
aperture.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A brake that brakes and releases the output shaft of a hydraulic motor, and a built-in spring that applies the brake using pressure oil from a pilot hydraulic source that acts in opposition to the output of the spring. a brake cylinder that releases the brake when the brake is applied; a main switching valve that switches the supply and discharge of pressure oil that drives the hydraulic motor; a first throttle that controls the flow rate of the pressure oil discharged from the brake cylinder to the tank; In a brake device for a hydraulic motor comprising a pressure compensating spool that maintains a constant pressure difference before and after the throttle, a piston is provided on the same axis as the pressure compensating spool, and a pressure compensating spring is sandwiched between the piston and the main switching spool. A switching valve that operates in conjunction with the valve to supply and cut off pressure oil from a pilot hydraulic source to the brake cylinder and the back of the piston, and also cuts off and connects the downstream passage of the first throttle to the tank, and a switch valve that connects the back of the piston and the first throttle. A brake device for a hydraulic motor, characterized in that a second throttle is provided between the downstream side and the downstream side of the hydraulic motor. 2. A brake device for a hydraulic motor according to claim 1, characterized in that the first throttle is built into the pressure compensating spool. 3 Claims 1 or 2 for utility model registration characterized in that the second throttle is built into the piston
The brake device for the hydraulic motor described in Section 1. 4. The hydraulic pressure according to claim 1, 2, or 3 of the utility model registration claim, wherein the pilot hydraulic pressure source is pressurized oil at a higher pressure among oil supply and drainage of a hydraulic motor obtained through a shuttle valve. Motor braking device. 5. A brake device for a hydraulic motor according to claim 1, 2 or 3, wherein the pilot hydraulic source is a pilot pump provided separately from a pump that drives the hydraulic motor. 6. A brake device for a hydraulic motor according to claim 4 or 5, wherein the first throttle, the second throttle, the pressure compensating spool, and the piston are built into the case of the hydraulic motor.