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.

公开(公告)号：US20210025140A1

公开(公告)日：2021-01-28

申请号：US16934116

申请日：2020-07-21

Applicant: DANFOSS POWER SOLUTIONS INC.

Inventor： Christian S. Daley

IPC: E02F9/22 ,  F15B13/044

Abstract: Automatic tilt command system of a hydraulically driven boom moveably connected with one end to a chassis of a working machine, wherein a tiltable tool is attachable to the other end. The system further comprises a first electronic control valve for controlling a fluid flow to and from a boom lift cylinder for moving of the boom and a second electronic control valve for controlling a fluid flow to and from a tilt cylinder for tilting the tool. A control unit receives input signals with regard to moving the boom and transmits based on the received input signals actuating signals to the first electronic control valve in order to move the boom. In parallel the control unit transmits tilting signals to the second electronic control valve which are based on a predetermined fluid flow ratio defined by the fluid flow for the boom movement and the fluid flow for tool levelling, so that the tool maintains its inclination angle with respect to the horizontal.

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：US20250074758A1

公开(公告)日：2025-03-06

申请号：US18956648

申请日：2024-11-22

Applicant: DANFOSS POWER SOLUTIONS INC.

Inventor： Christian S. Daley

IPC: B66F9/22 ,  B66F9/16 ,  E02F9/20

Abstract: An automatic tool tilt command system for a boom moveably connected with one end to a chassis of a working machine, wherein a tiltable tool is attachable to the other end. A first electronic control valve for controlling a fluid flow to and from a lift cylinder for moving the boom and a second electronic control valve for controlling a fluid flow to and from a tilt cylinder for tilting the tool. A control unit receives signals to move the boom and transmits signals to the first electronic control valve in order to move the boom. In parallel the control unit transmits signals to the second electronic control valve which are based on a predetermined fluid flow ratio defined by the fluid flow for the boom movement and the fluid flow for tool levelling, so that the tool maintains its inclination angle with respect to the horizontal.