F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
303/1, 138/41.1
F16D 31/02 (2006.01) E02F 9/12 (2006.01) E02F 9/22 (2006.01) F15B 11/044 (2006.01)
Patent
CA 1281612
ABSTRACT OF THE DISCLOSURE: The brake circuit apparatus for a hydraulic motor in a hydraulic circuit system having at least one main hydraulic pump, a hydraulic motor driven by a hydraulic fluid supplied from the main pump and having a rotary shaft, and a directional control valve actuated by an operation device for control of flow rate and flow direction of the hydraulic fluid supplied to the hydraulic motor from the main pump. The hydraulic motor is provided with a mechanical brake device having a brake release cylinder adapted to release the rotary shaft of the motor from the braking by the mechanical brake device by supply of a hydraulic fluid to the brake release cylinder. The apparatus further has an auxiliary hydraulic pump and a control circuit connected to the auxiliary pump, brake release cylinder and reservoir for control of fluid communication therebetween. The control circuit includes a hydraulic fluid supply line for receiving a hydraulic fluid supplied from the auxiliary hydraulic pump, a first line connected between the hydraulic fluid supply line and the brake release cylinder, and a second line connected between the hydraulic fluid supply line and the reservoir. The second line is associated with the directional control valve such that when the valve is in a neutral position, the hydraulic fluid supply line is brought into communication with the reservoir to thereby disable a hydraulic fluid from the supply line from being supplied to the brake release cylinder through the first line, while when the valve is actuated, such communication is interrupted to thereby enable the hydraulic fluid from the supply line to the supplied to the brake release cylinder through the first line.
513969
Hirata Toichi
Mihara Shinichi
Sugiyama Genroku
Tanaka Hideaki
Yoshida Kuniaki
Gowling Lafleur Henderson Llp
Hitachi Construction Machinery Co. Ltd.
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