Methods of controllling hydraulic motors

US8408328B2 · kind B2 · utility

Assignee

• Longyear TM, Inc. · US

Inventors

• Stefan Wrede · Kirchhundem, DE
• Christof Kruse · Wenden, DE

Key dates

• Filing date: May 7, 2012
• Grant date: Apr 2, 2013
• Expiry date: May 7, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/87225
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A hydraulic control system includes a first motor, a second motor, a pump operatively associated with the first motor, a first coupling valve operatively associated with the second motor, first parallel valves operatively associated with the second motor, and a first switching valve operatively associated with the first coupling valve and the first parallel valves. The first switching valve is configured to switch the first coupling valve between a first coupling state and a second coupling state opposite the first coupling state and to switch the first parallel valves between a first parallel state and a second parallel state opposite the first parallel state. While the first parallel valves are in the first parallel state a portion of the output of the first motor drives the second motor while the first parallel valves are in the second parallel state, the output of the pump drives the second motor.