Hydraulically driven forklift
US6554084B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 4, 2001 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Jan 4, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F9/24
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Front wheels (3A, 3B) are operably connected to hydraulic motors (21A, 21B), and hydraulic pumps (26A, 26B) driven by an engine (25) are provided, each hydraulic pump (26A, 26B) being connected to one of the hydraulic motors (21A, 21B). Control of speed is effected by switching the direction of oil flow from the hydraulic pumps (26A, 26B), changing the direction of rotation of the hydraulic motors (21A, 21B), controlling the rpm of the engine (25) and the flow rate of oil from the hydraulic pumps (26A, 26B), and changing the rpm's of the hydraulic motors (21A, 21B). Control of turning is made possible by controlling, based on the turning angle of a steering wheel or the turning angles of the rear wheels, the respective rotation speeds (equal or different) or the respective directions of rotation (same or opposite) of the front wheels (3A, 3B). Provided is a hydraulically driven forklift employing a 2-pump 2-motor system, which improves maneuverability and reduces the turning radius.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.