Fluid systems for machines with integrated energy recovery circuit

US9945396B2 · kind B2 · utility

Assignee

• Caterpillar Inc. · US

Inventors

• Tonglin Shang · Bolingbrook, US
• Aleksandar Egelja · Naperville, US
• Kalpesh Patel · Romeoville, US
• Jiao Zhang · Naperville, US
• Pengfei Ma · Naperville, US
• Dayao Chen · Bolingbrook, US

Key dates

• Filing date: Feb 23, 2016
• Grant date: Apr 17, 2018
• Expiry date: Oct 22, 2036

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B2211/7142
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A fluid system for a machine that includes a linkage. The fluid system includes an actuator, an accumulator, a pilot circuit, and a pressure reducing valve. The actuator is configured to manipulate the linkage. The accumulator is configured to store a fluid discharged by the actuator under pressure. The pilot circuit is fluidly coupled to the accumulator and is configured to receive the fluid from the accumulator. Further, the pressure reducing valve is positioned between the accumulator and the pilot circuit to regulate the pressure of the fluid delivered to the pilot circuit from the accumulator.