Title:
HYDRAULIC PUMP
Document Type and Number:
WIPO Patent Application WO/2023/181516
Kind Code:
A1
Abstract:
A hydraulic pump (1) according to one embodiment includes a casing (2) that accommodates a valve plate (3), a cylinder block (4), and a swash plate (5). The angle of the swash plate (5) is changed by a servo-piston (7), and the servo-piston (7) is slidably held by the casing. The servo-piston (7) is driven by an electric actuator (8) attached to the casing (2), and the electric actuator (8) includes an electric actuator including a screw shaft (84), a nut (83), and an electric motor (86). The casing (2) includes: an auxiliary pressure chamber (91) for pressing the servo-piston (7) toward the swash plate (5); and an introduction path (2c) through which a working fluid is introduced to the auxiliary pressure chamber (91) from a discharge path which is the high-pressure side among a first flow passage (2a) and a second flow passage (2b).
Inventors:
NISHIDA SHINJI
YOSHIMURA ISAMU
YOSHIMURA ISAMU
Application Number:
PCT/JP2022/045173
Publication Date:
September 28, 2023
Filing Date:
December 07, 2022
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F04B1/324
Foreign References:
| JPS6072985U | 1985-05-22 | |||
| JPH09133071A | 1997-05-20 | |||
| JPS59170480A | 1984-09-26 |
Attorney, Agent or Firm:
ARCO PATENT & TRADEMARK ATTORNEYS (JP)
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