Hydraulic control mechanism for a mobile machine tool, especially a wheel loader, for damping longitudinal oscillations
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Mar 5, 2002
Grant Date -
N/A
app pub date -
Jun 9, 2000
filing date -
Dec 10, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic control arrangement for a mobile working machine which serves for damping pitching vibrations and has a hydraulic accumulator which can be connected to a hydraulic fluid source via a filling valve and which can be connected to a pressure chamber of a hydraulic cylinder, and a shut off valve which, with a first condition fulfilled, can be moved into a through position in which hydraulic fluid can flow through it in the direction from the hydraulic accumulator to the pressure chamber of the hydraulic cylinder and vice versa. The shut off valve may, at the same time, also be the filling valve. A first condition may be that a certain traveling speed is exceeded. Limiting the accumulator pressure to a limit pressure is intended to keep the wear on the hydraulic accumulator low and to increase the safety. These two aims are achieved to better effect, wherein the shut off valve can also be moved, with the first condition fulfilled, into its shut off position when the load pressure in the pressure chamber of the hydraulic cylinder or the accumulator pressure reaches a maximum pressure.
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