公开(公告)号：US20250043779A1

公开(公告)日：2025-02-06

申请号：US18784464

申请日：2024-07-25

Applicant: ILLINOIS TOOL WORKS INC.

Inventor： Paul Rindahl ,  James Hennen ,  Scott Johnson ,  Kurt Kvistberg

IPC: F04B49/22 ,  F04B23/06 ,  F15B1/26 ,  F15B19/00

Abstract: A hydraulic power unit includes a reservoir containing hydraulic fluid, a main output, a pressure sensor, at least one active valve hydraulic pump and at least one passive valve hydraulic pump. A main flow of the hydraulic fluid is discharged through the main output. The pressure sensor includes a pressure signal that is indicative of a pressure of the main flow. Each active valve hydraulic pump is configured to drive a first flow portion of the main flow from the reservoir to the main output when the pressure signal is below a first pressure setpoint. Each passive valve hydraulic pump is configured to drive a second flow portion of the main flow from the reservoir to the main output when the pressure signal is below a second pressure setpoint.