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Mechanical Brake for Hydraulic Actuator System

IP.com Disclosure Number: IPCOM000046351D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Gupta, OR: AUTHOR [+2]

Abstract

The arrangement consists of a self-contained braking unit that can be attached to a hydraulically driven moving member. The hydraulic drive is obtained from a hydraulic motor which has a high and a low pressure port for controlling the drive. Reversing the pressure at these ports gives reversal of the drive. When the pressures at the high and low ports are equal, there is no drive output and the mechanism is stationary.

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Mechanical Brake for Hydraulic Actuator System

The arrangement consists of a self-contained braking unit that can be attached to a hydraulically driven moving member. The hydraulic drive is obtained from a hydraulic motor which has a high and a low pressure port for controlling the drive. Reversing the pressure at these ports gives reversal of the drive. When the pressures at the high and low ports are equal, there is no drive output and the mechanism is stationary.

This arrangement is satisfactory for drives in the horizontal plane since machine member loads are properly supported in the event of hydraulic power loss. However, when a member moving in the vertical direction experiences a hydraulic failure, the fluid will seep back to the pump and the vertical member will drop, causing possible injury or damage.

The new arrangement provides braking action when both ports 10 and 12 are at equal pressure. This happens when there is a loss of hydraulic power and fluid returns to pump and when the mechanism is not moving (both ports at equal pressure).

When there is no hydraulic pressure at either port l0 or 12 of the brake member 14, the springs 16 and 18, which are located at opposite ends of the piston 20, are sufficiently strong to centralize the cam- shaped part 22 against the pin 24. It should be appreciated that the same pressure at both ports 10 and 12 will similarly cause a centering of the piston 20 arrangement, thereby causing cam 22 to center, which places...