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Patent Searching and Data


Title:
HYDRAULIC MOTOR CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/058711
Kind Code:
A1
Abstract:
A hydraulic motor control device (100) comprises a volume switching valve (30) that controls the flow of working oil supplied to and discharged from a pair of switching actuators (20, 21) that change the volume of a piston motor (1) by driving a swash plate (2). The volume switching valve (30) includes: a first control port (31d) that is open to a housing hole (33) and through which working oil supplied to and discharged from the switching actuator (20) is guided; a second control port (31e) that is open to the housing hole (33) and through which the working oil supplied to and discharged from the switching actuator (21) is guided; and a drain port (31c) that is open to the housing hole (33) and communicates with a tank (51). The drain port (31c) is provided between the first control port (31d) and the second control port (31e) in a movement direction of a spool (40).

Inventors:
SAKAI, Yuki (World Trade Center Bldg. 4-1, Hamamatsu-cho 2-chome, Minato-k, Tokyo 11, 〒1056111, JP)
Application Number:
JP2018/025758
Publication Date:
March 28, 2019
Filing Date:
July 06, 2018
Export Citation:
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Assignee:
KYB CORPORATION (World Trade Center Bldg, 4-1 Hamamatsu-cho 2-chome, Minato-k, Tokyo 11, 〒1056111, JP)
International Classes:
F15B11/02; F03C1/253; F16K11/07
Foreign References:
JPH01116301A1989-05-09
JPS4964029A1974-06-21
JPS4411269Y11969-05-09
JPH0193603A1989-04-12
JP2017015152A2017-01-19
Attorney, Agent or Firm:
GOTOH & PARTNERS (Shoyu-Kaikan, 3-1 Kasumigaseki 3-chome, Chiyoda-k, Tokyo 13, 〒1000013, JP)
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