Dover TWG TULSA WINCH 1200W 서비스 매뉴얼 - 페이지 3

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INTRODUCTION AND THEORY OF OPERATION

The planetary hoist is designed to utilize a geroler, gear, or piston motor, driving through a multiple-

disc oil brake, through a pair of planetary gearsets to the cable drum.

The multiple-disc oil brake is spring applied and hydraulically released through a port in the brake

housing. During inhaul, the brake is not released, since the load is driven through a one-way cam

clutch, bypassing the brake. When the load comes to a stop, the cam clutch locks up and the brake

prevents the load from moving.

During payout, a brake valve is used to prevent the load from moving faster than desired. This

brake valve partially blocks the main line from the motor back to the directional control valve,

allowing only a limited amount of hydraulic fluid through the motor.

The brake valve is then

modulated by sensing pressure on the other main line, the line from the directional control valve to

the motor. Additionally, any time there is sufficient pressure (225 PSI ±10%) to modulate the

brake valve; this same pressure releases the brake.