Pressure control valve
AssigneeRobert Bosch GmbH
InventorsRainer Haeberer, Frieder Buerkle, Helmut Clauss, Markus Rueckle
Life of this patent
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Abstract
A pressure control valve for a fuel injection apparatus for internal combustion engines, including a housing with a high-pressure connection and a return connection and including a cup-shaped piston, which is disposed in a housing bore, can be moved axially between a valve seat oriented toward the high-pressure connection and a stop oriented toward the return connection, counter to the spring force of a spring acting in the direction of the valve seat, and has at least one through opening that connects the inside of the cup-shaped piston to the housing bore, is characterized in that at least one throttle element is disposed upstream and/or downstream of the valve seat in the flow direction of the fuel.
Claims7
A pressure control valve for a fuel injection apparatus for internal combustion engines, including a housing (10) with a high-pressure connection (11) and a return connection (12) and including a cup-shaped piston (30), which is disposed in a housing bore (14) and moved axially between a valve seat (16) oriented toward the high-pressure connection (11) and a stop (20) oriented toward the return connection (12), counter to the spring force of a spring (40) acting in a direction of the valve seat (16), and has at least one through opening (33) that connects the inside of the cup-shaped piston (30) to the housing bore (14), at least one throttle element (50;
- 53) is disposed upstream and/or downstream of the valve seat (16) in the flow direction of the fuel, the cup-shaped piston (30) having an additional piston (80) disposed coaxially in it, upon which, by means of the spring (40) or by means of an additional spring, a spring force is exerted in a direction of an additional valve seat (81) embodied on the cup-shaped piston (30), and this additional piston (80) has at least one additional throttle element (82;
- 83) which is acted upon by pressurized fuel through the lifting of the additional piston (80) from the additional valve seat (81).
Dependencies are inferred from the claim text.