公开(公告)号：US20230041899A1

公开(公告)日：2023-02-09

申请号：US17855378

申请日：2022-06-30

Applicant: Danfoss Power Solutions II Technology A/S

Inventor： Anil Balasaheb KHARPAS ,  Avinash Dadaso PATIL ,  Sanjay Dhondappa MALI ,  Amit Ranjit PANCHAL ,  Robert Leslie ISAACS

IPC: F04B1/324 ,  F15B13/044 ,  G05D16/20 ,  F15B13/16 ,  F04B49/00 ,  F15B13/04 ,  F04B49/08 ,  F15B13/02

Abstract: A pump control assembly for controlling a variable displacement hydraulic pump includes a spool mounted within a valve block. The spool is configured to move between a first and a second position within the valve block so as to selectively control the displacement of the attached pump. The pump control assembly further includes first and second chambers that each apply a force to opposite ends of the spool. The first chamber is positioned at a first end of the spool in fluid communication with a pump output port. The second chamber is positioned at a second end of the spool and in fluid communication with a hydraulic tank port and a proportional pressure reducing valve. The second chamber also includes a piston and first and second springs positioned on either side of the piston. The proportional pressure reducing valve provides a regulated pressure to a first side of the piston along with the first spring, and the hydraulic tank port provides a tank pressure on the opposite side of the piston along with the second spring. The pump control assembly also includes a stop structure having a positive stop that limits movement of the piston in a direction toward the first chamber.