Primary seals for master-slave cylinder systems
AssigneeMannesmann Sachs AG
InventorsKlaus Krappmann, André Gemeinhardt, Hai Sui, Dieter Gebauer, Boleslaw Tulaczko, Volker Stampf
Life of this patent
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Abstract
In a master/slave cylinder system for clutches or brakes, primary seals have bevels which interact with similar bevels of formations on housings of the respective cylinders. Along with the lowest possible friction in the region of the sealing lips, this permits carrying out uncomplicated pressure/negative-pressure filling in the case of the master cylinder. The primary seals slide by the wedge of effects in the direction of the pressure on the bevels of the annular formations and reduce the annular bearing face of the sealing lip in a frictionally optimized manner.
Claims14
A hydraulic system for the actuation of one of a brake and a clutch in a motor vehicle, said system comprising a master cylinder, a slave cylinder, and a variable pressure chamber therebetween, each of said cylinders comprising
- a housing,
- a piston which can be displaced in said housing along an axis,
- a primary seal seated in said housing facing said pressure chamber and axially fixed with respect to said housing, said primary seal having a sealing lip which contacts said piston and a first bevel facing oppositely from said pressure chamber, said first bevel being formed at an angle to said axis, and
- a rigid component comprising an annular formation supporting said primary seal, said annular formation being radially spaced from said piston and having a second bevel borne against by said first bevel, whereby
- during build-up of pressure in the pressure chamber, said second bevel supports said first bevel in order to concentrate friction forces at the sealing lip during displacement of the piston,
- wherein the first bevel of the primary seal of the master cylinder and the second bevel of the annular formation of the master cylinder form a common angle of 20 to 40 degrees with said axis.
A hydraulic system for the actuation of one of a brake and a clutch in a motor vehicle, said system comprising at least one of a master cylinder and a slave cylinder, and a variable pressure chamber communicating with each said at least one cylinder, each of said cylinders comprising
- a housing,
- a piston which can be displaced in said housing along an axis,
- a primary seal seated in said housing facing said pressure chamber and axially fixed with respect to said housing, said primary seal having a sealing lip which contacts said piston and a first bevel facing oppositely from said pressure chamber, said first bevel being formed at an angle to said axis, and
- a rigid component comprising an annular formation supporting said primary seal, said annular formation being radially spaced from said piston and having a second bevel borne against by said first bevel, whereby
- during build-up of pressure in the pressure chamber, said second bevel supports said first bevel in order to concentrate friction forces at the sealing lip during displacement of the piston,
- wherein the first bevel of the primary seal is formed at an angle of 20 to 40 degrees to the axis.
A hydraulic system for the actuation of one of a brake and a clutch in a motor vehicle, said system comprising a master cylinder, a slave cylinder, and a variable pressure chamber therebetween, each of said cylinders comprising
- a housing,
- a piston which can be displaced in said housing along an axis,
- a primary seal seated in said housing facing said pressure chamber and axially fixed with respect to said housing, said primary seal having a sealing lip which contacts said piston and a first bevel facing oppositely from said pressure chamber, said first bevel being formed at an angle to said axis, and
- a rigid component comprising an annular formation supporting said primary seal, said annular formation being radially spaced from said piston and having a second bevel borne against by said first bevel, whereby
- during build-up of pressure in the pressure chamber, said second bevel supports said first bevel in order to concentrate friction forces at the sealing lip during displacement of the piston,
- wherein said first bevel of the primary seal of the slave cylinder and the second bevel of the annular seal of the slave cylinder form a common angle of 30 to 40 degrees with said axis.
Dependencies are inferred from the claim text.