Laichinger Martin (Ebersbach DEX) Scheffel Martin (Vaihingen-Enzweihingen DEX)
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Robert Bosch GmbH (Stuttgart DEX 03)
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피인용 횟수 :
4인용 특허 :
0
초록▼
A pressure holding valve for pressure-fluid-actuated leveling systems in vehicles, having at least one seat valve with a valve opening, a valve seat and a valve member in which the valve member is opened by a control piston acted upon by pressure fluid. In order to achieve an absolutely pressure-tig
A pressure holding valve for pressure-fluid-actuated leveling systems in vehicles, having at least one seat valve with a valve opening, a valve seat and a valve member in which the valve member is opened by a control piston acted upon by pressure fluid. In order to achieve an absolutely pressure-tight seat valve with a long service life, an elastomer seal which seals off from the valve member is disposed on the valve seat, and pressure equalizing means are provided such that upon an impingement of pressure on the control piston in an opening direction of the seat valve, pressure build up upstream of the valve member is such that only a slight pressure difference arises at the seal at the onset of opening. In addition, the valve member is embodied such that upon displacement in a closing direction of the seat valve, the valve member substantially closes the valve opening in advance of the valve member becoming seated upon the seal.
대표청구항▼
A pressure holding valve for pressure-fluid-actuated leveling systems in vehicles, having at least one seat valve that has a valve opening connecting first and second valve chambers to one another, of which the first valve chamber communicates with a supply connection connectable in alternation to a
A pressure holding valve for pressure-fluid-actuated leveling systems in vehicles, having at least one seat valve that has a valve opening connecting first and second valve chambers to one another, of which the first valve chamber communicates with a supply connection connectable in alternation to a pressure fluid source or a pressure fluid sink and the second valve chamber communicates with a work connection, said second valve chamber has a valve seat and a valve member cooperating with the valve seat and acted upon in an opposite direction by the pressure in the two valve chambers, and having a control piston for opening the at least one seat valve, the control piston engaging the valve member and being capable of being acted upon by pressure fluid via a control line, a seal (48; 148, 148′) effecting sealing between the valve seat (38; 138, 138′) and the valve member (39; 139, 139′); pressure equalization means (54; 154, 163; 165, 166) which upon pressure imposition on the control piston (41; 141) builds up a pressure in the first valve chamber (34; 134, 134′) such that upon the onset of opening of the seat valve (40; 140, 140′) only a slight pressure difference appears at the seal (48; 148, 148′); and that the valve member (39; 139, 139′) is embodied such that upon displacement in a closing direction of the seat valve (40; 140, 140′), the valve member substantially closes the valve opening (36; 136, 136′) in advance of the valve member becoming seated upon the valve seat (38; 138, 138′), and the pressure equalization means has an equalization line (54; 154, 165), in which a throttle (54) is disposed and which connects the control line (28; 128) to the control piston (41; 141) with the first valve chamber (34; 134, 134′), and a blocking device (24) for blocking off the supply connection (17; 117, 117′) discharging into the first valve chamber (34; 134, 134′); and that in the terminal opening position of the seat valve (40; 140, 140′), the equalization line (54; 154; 165) is blocked off.
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이 특허를 인용한 특허 (4)
Steven Gautieri ; Allen Leon Maag ; David Lavern Ross, Control system for on-off valves resulting in proportional response.
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