Forklift hydraulic control apparatus
US9469515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2013 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Nov 9, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/88
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An outlet port of a hydraulic pump/motor and a bottom chamber of a lift cylinder are connected to each other by a hydraulic fluid passage. A hydraulic fluid passage that is connected to a hydraulic fluid tank is formed to branch off the hydraulic fluid passage. A flow control valve controls the hydraulic fluid delivered from the lift cylinder when the fork is lowered, thereby regulating the flow rate of hydraulic fluid supplied to the hydraulic pump/motor and the flow rate of hydraulic fluid supplied to the hydraulic fluid tank. If regenerative operation can be performed, the flow control valve is closed and hydraulic fluid is delivered to the hydraulic pump/motor. If regenerative operation cannot be performed, the flow control valve is opened and hydraulic fluid is delivered to the hydraulic fluid tank. In either case, the fork can be lowered at an instructed speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.