Electrohydraulic device

US5519995A · kind A · utility

Assignee

• Elektro-Mechanik GmbH · DE

Inventors

• Bernhard Sasse · Kirchhundem, DE
• Peter Zimmermann · Munich, DE

Key dates

• Filing date: May 12, 1994
• Grant date: May 28, 1996
• Expiry date: May 12, 2014

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B15/18
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

An electrohydraulic device for generating a force acting on a movable piston rod including a cylinder, a piston disposed in the cylinder forming a first cylinder portion and a second cylinder portion, a first pump disposed adjacent to the cylinder and in communication with the second cylinder portion, a second pump disposed adjacent to the first pump and in communication with the first pump and with the first cylinder portion, a housing defining a reservoir for operating fluid of the electrohydraulic device, the second pump being in communication with the reservoir, and an electric motor coupled to the first and second pumps by a shaft such that when the electric motor rotates in a first direction, the shaft drives the first pump while the second pump is idle and when the electric motor rotates in a second direction, the shaft drives the second pump while the first pump is idle. The operating fluid is pumped between the first cylinder portion and the second cylinder portion by the first and second pumps as a function of a direction of rotation of the electric motor causing the piston to move based on pressure acting on the piston and generating a force at the piston rod.