Method and arrangement for active make-up in an overrunning actuator

US8966890B2 · kind B2 · utility

Assignee

• Caterpillar Inc. · US

Inventors

• Daniel T. Mather · Lockport, US
• Troy A. Shawgo · Forsyth, US
• Daniel H. Killion · Blaine, US
• Vishnu Irigireddy · Lexington, US
• Deepak Amaravadi · Forsyth, US
• Dayao Chen · Bolingbrook, US
• Matthew Hempel · Urbandale, US
• Kenneth Alan Dust · Downers Grove, US
• Ryan Ludwig · Nashville, US
• Alfred J. Abraham · Decatur, US
• Michael E. Nesbitt · Nashville, US

Key dates

• Filing date: Jul 29, 2011
• Grant date: Mar 3, 2015
• Expiry date: Jun 22, 2033

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B7/001
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydraulic system having an actuator having a piston and associated rod forming head and rod chambers and being adapted to move between retracted and extended positions within a cylinder, and first and second sources of fluid. A first pump provides fluid from the first source to the head chamber at a first pressure. At least one valve provides fluid from the second source at a second pressure to supplement fluid provided to the head chamber from the first pump when the second pressure is greater than the first pressure.