Title:
PRESSURE OIL ENERGY RECOVERY DEVICE FOR OPERATING MACHINE
Document Type and Number:
WIPO Patent Application WO/2014/119569
Kind Code:
A1
Abstract:
Provided is a pressure oil energy recovery device for an operating machine, wherein even if a high load is applied to a liquid pressure cylinder and pressure oil exceeding the maximum working pressure of the pressure oil energy recovery device flows out from the liquid pressure cylinder, the unnecessary excessive rotation of the pressure oil energy recovery device is prevented, and satisfactory operability can be ensured.
A pressure oil energy recovery device for an operating machine is provided with: a recovery duct which connects a liquid pressure cylinder and a hydraulic motor; a recovery control valve which is provided in the recovery duct and has an adjustable opening area; a pressure detection means which detects a pressure signal of an oil chamber on the side connected to the recovery duct of the liquid pressure cylinder; an operation amount detection means which detects the operation amount of an operation means; and a control unit which takes in a pressure detection value detected by the pressure detection means and the operation means operation amount detected by the operation amount detection means, and when the pressure detection value exceeds the maximum working pressure of the hydraulic motor, outputs a command to control the opening area of the recovery control valve according to the operation means operation amount detected by the operation amount detection means.
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Inventors:
HIJIKATA SEIJI (JP)
SATAKE HIDETOSHI (JP)
SATAKE HIDETOSHI (JP)
Application Number:
PCT/JP2014/051836
Publication Date:
August 07, 2014
Filing Date:
January 28, 2014
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
F15B21/14; E02F9/20; E02F9/22
Domestic Patent References:
| WO2013099710A1 | 2013-07-04 |
Foreign References:
| JP2012097844A | 2012-05-24 | |||
| JP2009281525A | 2009-12-03 | |||
| JP2012237339A | 2012-12-06 |
Attorney, Agent or Firm:
KAICHI IP (JP)
Patent business corporation development-of-knowledge international patent firm (JP)
Patent business corporation development-of-knowledge international patent firm (JP)
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