Title:
【発明の名称】可変式吸込口加圧装置
Document Type and Number:
Japanese Patent JPH06506521
Kind Code:
A
Abstract:
In the present fluid system, a variable pressure inlet system is provided and operational to control the operating pressure level of a charge pump in response to various operating parameters of the fluid system. The charge pump provides pressurized fluid to an inlet of a hydraulic pump to insure filling of the pumping chambers therein. By having the operating pressure level of a variable pressure relief valve that is connected to the charge pump controlled between a minimum pressure level and a maximum pressure level responsive to various operating perimeters of the system, the degree of horsepower needed to drive the charge pump is controlled. The operating pressure level of the variable pressure relief valve may be controlled in response to movement of a swash plate of the hydraulic pump, the speed of the input drive mechanism to the hydraulic pump, the movement of the spool of the control valve, or by the operating pressure level representative of a load L or by any combinations thereof acting in parallel one with the other.
Inventors:
Bazic, Taduuse
Application Number:
JP51241393A
Publication Date:
July 21, 1994
Filing Date:
October 26, 1992
Export Citation:
Assignee:
Caterpillar Incorporated
International Classes:
F04B23/04; F04B49/00; F04B49/08; (IPC1-7): F04B23/04
Attorney, Agent or Firm:
Shoichi Ui (4 others)