Title:
HYDRAULIC PUMP AND HYDRAULIC DEVICE
Document Type and Number:
Japanese Patent JP2021025416
Kind Code:
A
Abstract:
To provide a hydraulic pump capable of improving stability of operation of a hydraulic cylinder by reducing noise when the hydraulic pump is combined with the hydraulic cylinder.SOLUTION: A hydraulic pump 3 comprises a cylinder block 63 and a valve plate 67. A first port 21, a second port 22 and a third port 23 are formed in the valve plate 67. When a circular region around a rotation axis center of the cylinder block 63 is divided into a first half circular region 67a and a second half circular region 67b, the first port 21 is disposed in the first half circular region 67a. The second port 22 is disposed in the second half circular region 67b. The third port 23 is disposed at an inner peripheral side than the second port 22 in the second half circular region 67b. In the cylinder block 63, a plurality of piston holes 69 are disposed, along two virtual circles of which the diameter are different from each other around an axis center 71, alternately in circumferential directions of the two virtual circles.SELECTED DRAWING: Figure 2
Inventors:
MOCHIZUKI YASUHISA
EGUCHI SHINGO
EGUCHI SHINGO
Application Number:
JP2019140646A
Publication Date:
February 22, 2021
Filing Date:
July 31, 2019
Export Citation:
Assignee:
YANMAR POWER TECHNOLOGY CO LTD
International Classes:
F04B1/22
Domestic Patent References:
| JPH10184532A | 1998-07-14 | |||
| JPS5578767U | 1980-05-30 | |||
| JP2011017317A | 2011-01-27 | |||
| JP2009121435A | 2009-06-04 |
Foreign References:
| WO1998017913A1 | 1998-04-30 |
Attorney, Agent or Firm:
Naomi Katsura River