Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
1999-07-14
2001-06-12
Rivell, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S539000, C251S337000
Reexamination Certificate
active
06244295
ABSTRACT:
PRIOR ART
The invention is based on a check valve for an oil circulation system.
One such check valve, intended especially for an oil circulation system in an internal combustion engine, is known from European Patent Disclosure EP 0 268 520 B1. The known check valve has a tubular valve housing, on one end of which a valve seat is formed and in whose other end a closure element is inserted that between itself and the valve seat encloses a valve closing body in the form of a valve ball received in the valve housing. The closure element is a part that is geometrically relatively complicated, with a radial flange by which it is mounted in the valve housing, and with a tube segment or truncated cone, protruding integrally from the radial flange into the interior of the valve housing, that serves as a stop for the valve closing body and forms a valve stroke limitation.
ADVANTAGES OF THE INVENTION
The valve housing of the check valve of the invention, has inward-protruding guide ribs for guiding the valve closing body. The preferably disk-shaped retaining element is mounted on these guide ribs, for instance by press-fitting in the axial direction into the valve housing. Between an outer rim of the retaining element and an inside of a circumferential wall of the valve housing, there is a radial spacing, or in other words an interstice, through which the fluid can flow. There is a large low cross section, especially if the closure element is provided with one or more flow openings. With the interstice, despite a desired large flow cross section, an overall small structural side of the check valve can advantageously be attained.
Because the check valve can be embodied in such a way that the flow cross section in the interstice does not decrease even if the valve closing body is sharply deflected, the valve closing body has less tendency to vibrate, which advantageously reduces noise and increases the durability of the check valve.
By shaping the valve housing radially inward in the region of the retaining element, the hold of the retaining element in the valve housing is made stronger.
The check valve of the invention is preferably provided in a piston pump, in particular as an inlet valve and/or outlet valve of the piston pump. The piston pump is intended in particular as a pump in a brake system of a vehicle and is used in controlling the pressure in wheel brake cylinders. The piston pump of the invention is intended in particular as a pump in a brake system of a vehicle and is used to control the pressure in wheel brake cylinders. Depending on the type of brake system, the abbreviations ABS, ASR, FDR and EHB are used for such brake systems. In the brake system, the pump serves for instance to return brake fluid from a wheel brake cylinder or a plurality of wheel brake cylinders to a master cylinder (ABS) and/or to pump brake fluid out of a supply container into a wheel brake cylinder or a plurality of wheel brake cylinders (ASR or FDR or EHB). In a brake system with wheel slip control (ABS or ASR) and/or a brake system serving as a steering aid (FDR) and/or an electrohydraulic brake system (EHB), the pump is needed. With the wheel slip control (ABS or ASR), locking of the wheels of the vehicle during a braking event involving strong pressure on the brake pedal (ABS) and/or spinning of the driven wheels of the vehicle in the event of strong pressure on the gas pedal (ASR) can for instance be prevented. In a brake system serving as a steering aid (FDR), a brake pressure is built up in one or more wheel brake cylinders independently of an actuation of the brake pedal or gas pedal, for instance to prevent the vehicle from breaking out of the track desired by the driver. The pump can also be used in an electrohydraulic brake system (EHB), in which the pump pumps the brake fluid into the wheel brake cylinder or wheel brake cylinders if an electric brake pedal sensor detects an actuation of the brake pedal, or in which the pump is used to fill a reservoir of the brake system.
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Aicher Harald
Bartussek Walter
Haecker Juergen
Heusinkveld Joerg
Hueber Hubert
Greigg Edwin E.
Greigg Ronald E.
Rivell John
Robert & Bosch GmbH
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