Hydraulic drive apparatus for construction equipment
US8589038B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2010 |
| Grant date | Nov 19, 2013 |
| Priority date | — |
| Expiry date | Jan 15, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic drive system for a working machine provides improved safety during forced regeneration. Upon input of a forced regeneration command signal from a forced regeneration switch, a controller detects non-operated states of all hydraulic actuators such as an arm cylinder arranged on a hydraulic excavator based on a lock detection signal from a gate lock detection switch, and also an attitude of a front working mechanism. The attitude is proper from the standpoint of safety. The detection is based on an arm angle signal from an arm angle sensor, a bucket angle signal from a bucket angle sensor and a boom pressure signal from a boom pressure sensor. Taking the detection of the non-operated states and proper attitude as conditions, the controller outputs control signals to a boosting proportional solenoid valve and flow-rate controlling, proportional solenoid valve to make a forced regenerator conduct forced regeneration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.