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Patent Searching and Data


Title:
HYDRAULIC DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/026892
Kind Code:
A1
Abstract:
This hydraulic drive device is provided with: an electric motor; a variable capacity pump which is driven by the electric motor and which has a pair of pump ports of which a discharge side and a suction side switch in accordance with the direction of rotation of the electric motor; a hydraulic actuator which is connected to the pair of pump ports by means of a first supply/discharge line and a second supply/discharge line; and a control device which controls the electric motor on the basis of an actuator position command value for the hydraulic actuator; wherein the pump is configured in such a way that the capacity of the pump decreases as a differential pressure between the first supply/discharge line and the second supply/discharge line increases.

Inventors:
TANAKA HIDEKI
WATANABE HIDEKI
YOSHIMURA ISAMU
HATTORI TOMOHIDE
OGATA MARIKO
ANADA TADASHI
Application Number:
PCT/JP2018/028612
Publication Date:
February 07, 2019
Filing Date:
July 31, 2018
Export Citation:
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Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F04B49/16; F04B1/22; F04B1/26; F15B11/00; F15B15/18
Foreign References:
JP2004257448A2004-09-16
JP2008291731A2008-12-04
US20140033697A12014-02-06
JP2004257448A2004-09-16
Other References:
See also references of EP 3663580A4
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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