Title:
可変容量型斜板式油圧ポンプ
Document Type and Number:
Japanese Patent JP6495018
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce an operating force generated when a tilting actuator tilts a swash plate, and achieve overall downsizing, weight reduction, and cost reduction.SOLUTION: A hydrostatic bearing oil groove 13 cut out along a convex curved surface 12C for introducing hydraulic oil from a discharge passage 3B is provided in a leg section 12A of a swash plate 12. A protrusion fitting groove 14 cut out along the concave curved surface 12C to be continuous with the other end surface 13C of the hydrostatic bearing oil groove 13 and having a smaller dimension H3 than a depth dimension H1 of the hydrostatic bearing oil groove 13 is provided in the leg section 12A. Furthermore, a protrusion extending along a tilting support surface 4A of a swash-plate support member 4 in a state of protruding to the protrusion fitting groove 14 and the hydrostatic bearing oil groove 13 from the tilting support surface 4A, and slidably fitted into the protrusion fitting groove 14 is provided on the tilting support surface 4A. With this configuration, the protrusion 15 is fitted into the protrusion fitting groove 14 and a projected net area difference is generated between two end surfaces 13B and 13C in a length direction of the hydrostatic bearing oil groove 13.SELECTED DRAWING: Figure 5
Inventors:
Nakano Hisami
Application Number:
JP2015008580A
Publication Date:
April 03, 2019
Filing Date:
January 20, 2015
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
F04B1/22
Domestic Patent References:
| JP7103133A | ||||
| JP9166074A | ||||
| JP2005351140A |
Attorney, Agent or Firm:
Hirowa Patent Office
Kazuhiko Hirose
Kazuhiko Hirose