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Title:
HYDRAULIC APPARATUS
Document Type and Number:
Japanese Patent JP2004263806
Kind Code:
A
Abstract:

To obtain a hydraulic apparatus free from restrictions on attitude control.

The hydraulic apparatus comprises a hydraulic pump 1 driven by an electric motor 6 capable of bidirectionally rotating, and both ports of a hydraulic cylinder and both ports of the hydraulic pump 1 are connected via a pair of pipes respectively. A sliding hole 38 is formed between an outer cylinder 32 and an inner cylinder 34, and the sliding hole 38 is partitioned into a pre-load chamber 50 and a tank chamber 18 by means of a piston 44 slidably inserted into the sliding hole 38. The tank chamber 18 and a pair of the pipes are connected with each other via check valves which are mounted to permit both outflows from the tank chamber 18, and the tank chamber 18 is preloaded by means of air pressure led to the pre-load chamber 50. The hydraulic pump 1, which is a swash type piston pump, is arranged inside the inner cylinder 34. The outer cylinder 32 and the inner cylinder 34 are coaxially arranged on the rotary axis of the electric motor 6, and the outer cylinder 32 and the outer cylinder 34 are mounted on the electric motor 6.


Inventors:
Yogo, Teruaki
Application Number:
JP2003000056258
Publication Date:
September 24, 2004
Filing Date:
March 03, 2003
Export Citation:
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Assignee:
OPTON CO LTD
International Classes:
F15B11/08; F04B23/02; F15B7/10; F15B15/18; (IPC1-7): F15B11/08
Attorney, Agent or Firm:
足立 勉



 
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