公开(公告)号：US11719265B2

公开(公告)日：2023-08-08

申请号：US17320480

申请日：2021-05-14

Applicant: Caterpillar Inc.

Inventor： Gustaf Andrew Johnson ,  Pengfei Ma ,  Jordan Garrity

IPC: F15B21/0423 ,  E02F9/22

CPC classification number: F15B21/0423 ,  E02F9/226 ,  E02F9/2267

Abstract: A work machine includes a frame, a traction system supporting the frame, an implement system supported by the frame, and a hydraulic system. The hydraulic system includes a hydraulic oil tank, a control circuit, an oil cooler, and a cooler bypass valve assembly. The cooler bypass valve assembly is connected to the control circuit by a control circuit return line, and includes an unloading valve configured to allow hydraulic oil to flow from the control circuit return line to the hydraulic oil tank if a pressure of hydraulic oil in the control circuit return line exceeds a first threshold, a backpressure valve configured to allow hydraulic oil to flow from the return line to the oil cooler through an oil cooler inlet line if a pressure of hydraulic in the oil control circuit return line exceeds a second threshold, and an orifice configured to limit the flow of hydraulic oil through the backpressure valve.

公开(公告)号：US20220364581A1

公开(公告)日：2022-11-17

申请号：US17320480

申请日：2021-05-14

Applicant: Caterpillar Inc.

Inventor： Gustaf Andrew Johnson ,  Pengfei Ma ,  Jordan Garrity

IPC: F15B21/0423 ,  E02F9/22

Abstract: A work machine includes a frame, a traction system supporting the frame, an implement system supported by the frame, and a hydraulic system. The hydraulic system includes a hydraulic oil tank, a control circuit, an oil cooler, and a cooler bypass valve assembly. The cooler bypass valve assembly is connected to the control circuit by a control circuit return line, and includes an unloading valve configured to allow hydraulic oil to flow from the control circuit return line to the hydraulic oil tank if a pressure of hydraulic oil in the control circuit return line exceeds a first threshold, a backpressure valve configured to allow hydraulic oil to flow from the return line to the oil cooler through an oil cooler inlet line if a pressure of hydraulic in the oil control circuit return line exceeds a second threshold, and an orifice configured to limit the flow of hydraulic oil through the backpressure valve.