Pneumatic brake booster comprising improved sealing means
A pneumatic brake booster comprising an envelope ( 101 ) of longitudinal axis (Y) formed of a dish ( 105 ) having a rim ( 153 ) and a lid ( 103 ). The envelop ( 101 ) defining an interior volume ( 107 ) that is divided into a variable-pressure work chamber ( 109 ) and a low-pressure chamber ( 111 )...
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| Main Authors | , |
|---|---|
| Format | Patent |
| Language | English |
| Published |
25.09.2003
|
| Online Access | Get full text |
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| Summary: | A pneumatic brake booster comprising an envelope (
101
) of longitudinal axis (Y) formed of a dish (
105
) having a rim (
153
) and a lid (
103
). The envelop (
101
) defining an interior volume (
107
) that is divided into a variable-pressure work chamber (
109
) and a low-pressure chamber (
111
) by a skirt (
113
). The skirt (
113
) is mounted to sealingly slide along the longitudinal axis (Y) of the envelope (
107
). The skirt (
113
) has a central orifice (
115
) with a pneumatic piston (
117
) sealingly mounted therein. A three-way valve (
123
) is mounted in the pneumatic piston (
117
) and is actuated by an actuating rod (
125
) connected to a brake pedal. The booster is characterized in that the sealing between the variable-pressure work chamber (
109
) and the low-pressure chamber (
111
) is achieved by a first sealing member (
156
) arranged between a radially internal first end of the skirt (
113
) and a radially external end of the piston (
117
) and a second sealing member (
157
) arranged at a radially external second end of the skirt (
113
) and an internal surface of the rim (
153
). The skirt (
113
) provides sealing between the radially external first end of the skirt and the radially internal second end of the skirt. |
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