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Patent Searching and Data


Title:
LOAD SENSING PUMP SYSTEM, HYDRAULIC CONTROL SYSTEM, AND CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2021/226791
Kind Code:
A1
Abstract:
A load sensing pump system, a hydraulic control system, and construction machinery. The load sensing pump system comprises: a variable displacement pump (1); a fixed displacement pump (2), driven by a same drive mechanism as the variable displacement pump (1); a variable displacement control mechanism, used for controlling the variable displacement pump (1); a control oil circuit; and a pressure valve (3), configured to make, by means of the control oil circuit, part of output pressure of the fixed displacement pump (2) act on a control end of the variable displacement control mechanism, so as to increase the maximum displacement of the variable displacement pump (1) when the driving rotation speed of the drive mechanism increases.

Inventors:
XIANG XIAOQIANG (CN)
LIU DONGHONG (CN)
TONG MENG (CN)
WANG JIANCHENG (CN)
CHEN LONG (CN)
Application Number:
PCT/CN2020/089616
Publication Date:
November 18, 2021
Filing Date:
May 11, 2020
Export Citation:
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Assignee:
XUZHOU HEAVY MACHINERY CO LTD (CN)
International Classes:
F15B11/04; E02F9/22
Foreign References:
CN103882906A2014-06-25
CN109319676A2019-02-12
JPH11236902A1999-08-31
Attorney, Agent or Firm:
CCPIT PATENT AND TRADEMARK LAW OFFICE (CN)
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