Title:
HYDRAULIC PUMP SYSTEM AND CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/140821
Kind Code:
A1
Abstract:
A hydraulic pump system provided with: a hydraulic pump the discharge flow rate of which can be changed; a regulator device for adjusting the discharge flow rate of the hydraulic pump; an operation device having an operation tool; a lock-switching input unit for canceling a locked state of the operation tool; an unload valve, the opening area of which can be changed to adjust the discharge pressure of the hydraulic pump; and a control device for controlling the movement of the unload valve. When a prescribed operation condition is satisfied, the control device reduces the opening area of the unload valve and thereby increases the discharge pressure of the hydraulic pump, and after the control device has increased the discharge pressure of the hydraulic pump, the regulator device increases the discharge flow rate. The operation condition includes the cancellation of the locked state of the operation tool by the lock-switching input unit.
Inventors:
KONDO AKIHIRO
MURAOKA HIDEYASU
MURAOKA HIDEYASU
Application Number:
PCT/JP2020/045942
Publication Date:
July 15, 2021
Filing Date:
December 09, 2020
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/02; E02F9/22; F15B11/00
Foreign References:
| JP2019052703A | 2019-04-04 | |||
| JPH0557052U | 1993-07-30 | |||
| JP2010071425A | 2010-04-02 | |||
| JPH05106563A | 1993-04-27 | |||
| US20170009784A1 | 2017-01-12 |
Attorney, Agent or Firm:
ISHIDA, Shoji (JP)
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