Patent ID: 6041601
Filing Date: 2000-03-28
Classification: B60T,G05G

Abstract:
A braking device having a master cylinder and of a pneumatic booster, said booster comprising: a rigid casing; a moving partition delimiting at least one front chamber and one rear chamber, in a leaktight fashion, within said casing; a three-way valve operated by a control rod to selectively to allow different pressures into said front and rear chambers to develop a correspondingly boost force which acts on said moving partition to move said moving partition in a first axial direction towards said master cylinder; and a push rod connected to said moving partition for operating said master cylinder, said casing having a front shell secured to said master cylinder and forming a first wall for said front chamber, and a rear shell forming a second wall for said rear chamber, characterized in that said front shell comprises a peripheral member having a larger relative diameter secured to said rear shell, and a central member having a smaller relative diameter secured to said master cylinder, said peripheral member and said central member being connected in an annular overlap region to form said first wall, and said overlap region of said peripheral member part is at least locally further forward than said central member part in said first axial direction, said overlap region being formed such that said first wall separates in said overlap region to absorb kinetic energy in response to a frontal or oblique impact force being applied to said first wall to prevent such impact force from being transmitted to an operator.