公开(公告)号：US20180291797A1

公开(公告)日：2018-10-11

申请号：US15946880

申请日：2018-04-06

Applicant: DANFOSS POWER SOLUTIONS INC.

Inventor： Christian S. Daley ,  Nicholas Creager ,  Matt Dorenkamp ,  Eric R. Jacobson

IPC: F01P7/04 ,  F16H61/4148 ,  F04B49/00

CPC classification number: F16H61/4026 ,  F04B49/002 ,  F04B49/08 ,  F04B49/24 ,  F04B49/246 ,  F04B2205/16 ,  F15B2211/20507 ,  F16H61/4043 ,  F16H61/4052 ,  F16H61/4104 ,  F16H61/4139

Abstract: A hydraulic system that has a hydraulic pump connected to and in communication with a hydraulic motor, at least one hydraulic cylinder, or both by a first conduit and a second conduit (i.e., a high side and a low side). The hydraulic system has a bypass valve connected to and in communication with the first conduit and the second conduit. The bypass valve has a preset pressure that is above a minimum low side pressure. When a shock load occurs in the hydraulic system and a related drop in pressure on the low side occurs, the bypass valve opens when the preset pressure is passed thereby preventing the pressure from dropping to the minimum low side pressure. The hydraulic system thereby avoids a low loop event that could cause damage to the hydraulic system without the presence of larger charge pumps or accumulators.

公开(公告)号：US10550933B2

公开(公告)日：2020-02-04

申请号：US15946880

申请日：2018-04-06

Applicant: DANFOSS POWER SOLUTIONS INC.

Inventor： Christian S. Daley ,  Nicholas Creager ,  Matt Dorenkamp ,  Eric R. Jacobson

IPC: F16H61/4026 ,  F16H61/4052 ,  F16H61/4104 ,  F16H61/4139 ,  F04B49/00

Abstract: A hydraulic system that has a hydraulic pump connected to and in communication with a hydraulic motor, at least one hydraulic cylinder, or both by a first conduit and a second conduit (i.e., a high side and a low side). The hydraulic system has a bypass valve connected to and in communication with the first conduit and the second conduit. The bypass valve has a preset pressure that is above a minimum low side pressure. When a shock load occurs in the hydraulic system and a related drop in pressure on the low side occurs, the bypass valve opens when the preset pressure is passed thereby preventing the pressure from dropping to the minimum low side pressure. The hydraulic system thereby avoids a low loop event that could cause damage to the hydraulic system without the presence of larger charge pumps or accumulators.