- Patent Title: Apparatus for controlling the switch-over of hydraulic cylinders
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Application No.: US16634995Application Date: 2018-08-01
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Publication No.: US11618232B2Publication Date: 2023-04-04
- Inventor: Dirk Becher , Werner Haendle , Achim Helbig , Christoph Boes
- Applicant: MOOG GmbH
- Applicant Address: DE Boeblingen
- Assignee: MOOG GmbH
- Current Assignee: MOOG GmbH
- Current Assignee Address: DE Boeblingen
- Agency: Harter Secrest & Emery LLP
- Priority: DE102017117436.2 20170801
- International Application: PCT/EP2018/070878 WO 20180801
- International Announcement: WO2019/025491 WO 20190207
- Main IPC: B30B15/16
- IPC: B30B15/16 ; B30B15/18 ; F15B7/00 ; F15B11/02

Abstract:
An electro-hydrostatic drive for realizing a rapid movement during a rapid movement phase, a force-building movement during a force-building movement phase. The apparatus comprises a hydro-machine with variable volume and/or rotational speed, driven by an electric motor, for providing a volume-stream of a hydraulic fluid, a first cylinder with a piston chamber, an rod chamber, and a plunger rod, a reservoir, a pressure source, a relief valve, a check valve, a fluid connection between the piston chamber and the hydro-machine, a fluid connection between the rod chamber and the hydro-machine, a fluid connection between the piston chamber and the reservoir, a fluid connection between the rod-chamber-side port of the hydro-machine and the reservoir, a fluid connection, through the relief valve, between the reservoir and the pressure source. The relief valve is for pressure safety of the reservoir, and the check valve has a fluid connection from the pressure source to the rod-chamber-side port of the hydro-machine, during the rapid movement phase, a first part of the hydraulic fluid is piped through the fluid connection between the piston chamber and the hydro-machine and the fluid connection between the rod chamber and the hydro-machine, and a second part of the hydraulic fluid communicates through the fluid connection between the piston chamber and the reservoir, during the force-building movement phase, a first part of the hydraulic fluid is piped through the fluid connection between the piston chamber and the hydro-machine and the fluid connection between the rod chamber and the hydro-machine, and a second part of the hydraulic fluid is piped through the fluid connection between the rod-chamber-side port of the hydro-machine and the reservoir.
Public/Granted literature
- US20200180253A1 Apparatus for Controlling the Switch-Over of Hydraulic Cylinders Public/Granted day:2020-06-11
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