公开(公告)号：US10145396B2

公开(公告)日：2018-12-04

申请号：US15380708

申请日：2016-12-15

Applicant: Caterpillar Inc.

Inventor： Hongliu Du ,  Joseph R. Robey

IPC: F16D31/02 ,  F15B21/14 ,  F15B13/04 ,  E02F9/22 ,  E02F3/43

Abstract: An energy recovery system includes cylinders that articulate a hydraulic tool in a pump mode to provide potential energy and in a motor mode to recover the potential energy. The energy recovery system includes a tank that stores a hydraulic fluid for the cylinders and an open circuit variable displacement pump that circulates the hydraulic fluid in the pump mode from the tank to the cylinders and in the motor mode from the cylinders to the tank. The open circuit variable displacement pump includes a swashplate articulable between a positive position and a negative position. In the positive position, the hydraulic fluid circulates in the pump mode and in the negative position the hydraulic fluid circulates in the motor mode. The open circuit variable displacement pump includes an actuator that articulates the swashplate and a bias system that maintains the swashplate in a positive position when the hydraulic fluid is not in circulation.