Title:
作業器具用の閉回路エネルギ回収システム
Document Type and Number:
Japanese Patent JP4870366
Kind Code:
B2
Abstract:
A closed circuit hydraulic system includes a fluid reservoir, a hydraulic cylinder having a cylinder rod, a bidirectional variable displacement hydraulic pump that pumps fluid to either extend or retract the cylinder rod on demand, a flow control valve for relieving pressure between the variable displacement hydraulic pump and the cylinder, and a low pressure check valve between the variable displacement hydraulic pump and the fluid reservoir. Also included is a charge pump for charging the variable displacement hydraulic pump and an accumulator for saving extra energy and fluid from the hydraulic cylinder during the retraction of an extended cylinder rod and using that fluid and energy during the extension of the hydraulic cylinder to reduce a load on the charge pump. The flow control valve opens on demand to allow floating. The low pressure check valve opens when pressure at an inlet of the variable displacement hydraulic pump is low to provide additional fluid and pressure so as to avoid cavitation. A method for using the closed circuit hydraulic system is also provided.
Inventors:
Mark John Charney
Application Number:
JP2005047484A
Publication Date:
February 08, 2012
Filing Date:
February 23, 2005
Export Citation:
Assignee:
DEERE AND COMPANY
International Classes:
E02F9/22; B66F9/22; F15B11/08; E02F9/20; F04B17/00; F04B23/08; F04B35/00; F15B11/02; F15B11/12; F15B11/17; F15B21/14
Domestic Patent References:
| JP59177802U | ||||
| JP50077688U | ||||
| JP61127967A | ||||
| JP60081502A | ||||
| JP2002054602A | ||||
| JP2000025957A |
Foreign References:
| WO2001088381A1 | ||||
| DE3918119A1 |
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Shigeo Takeuchi
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Shigeo Takeuchi