Title:
PUMP DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/212919
Kind Code:
A1
Abstract:
A pump device (100) is provided with: a tilt actuator (15) that controls the tilt angle of a swash plate (11) in a variable capacity-type first pump (10); a regulator (60) that adjusts a control pressure (Pcg) in accordance with the pressure difference across a control valve (3); and a control actuator (70) that drives the regulator (60) in accordance with the pressure difference across a resistor (65) to which hydraulic oil discharged from a fixed capacity-type second pump (16) is guided. The pressure-receiving area of a control piston (71) on which auxiliary pressure (Po) against the upstream pressure (P3) of the resistor (65) acts in the control actuator (70) is set so that the auxiliary drive force corresponds to the amount of a reduction in the differential pressure drive force accompanying the switching of the rotational speed of a drive source from a first rotational speed to a second rotational speed.
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Inventors:
SAKAI YUKI (JP)
Application Number:
PCT/JP2017/019284
Publication Date:
December 14, 2017
Filing Date:
May 23, 2017
Export Citation:
Assignee:
KYB CORP (JP)
International Classes:
F04B49/06; F15B11/02
Domestic Patent References:
| WO2014156532A1 | 2014-10-02 |
Foreign References:
| JP2010230133A | 2010-10-14 | |||
| JP2000120604A | 2000-04-25 |
Other References:
See also references of EP 3470676A4
Attorney, Agent or Firm:
GOTOH & PARTNERS (JP)
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