Negative pressure-type booster device
AssigneeAdvics Co., Ltd.
InventorKimiyasu Suzuki
Life of this patent
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Abstract
The present invention addresses the problem of standardizing a front shell of a booster shell of a negative pressure-type booster device by modifying the shape of a reinforcement rib provided to the front shell so as to satisfy the demand for varying the installation pitch and installation angle of tie-rod holes with one and the same front shell. A front shell configuring a booster shell of a negative pressure-type booster device in combination with a rear shell includes a reinforcement rib formed by bending the shells, wherein the reinforcement rib is formed along a virtual ellipse of which the center is located at the center of the front shell, with the major axes of the ellipse disposed on a line connecting the centers of two tie-rod holes provided in the front shell.
Claims6
A negative pressure-type booster device having a booster shell obtained by combining a front shell and a rear shell, an interior of the booster shell being partitioned into a constant-pressure chamber and a variable-pressure chamber by a bulkhead member of a power piston,
- the front shell including a reinforcement rib formed by bending the front shell and two tie-rod holes in which tie rods are inserted, the two tie-rod holes being disposed on a straight line extending in a radial direction through a center of the front shell, and a master cylinder being fastened to the booster shell by the tie rods inserted into the tie-rod holes, wherein
- the reinforcement rib of the front shell is formed along a virtual ellipse in which a center of the ellipse is located at a center of the front shell and a major axis of the ellipse is disposed on an axial line connecting a center of the tie-rod hole and the center of the front shell.
Dependencies are inferred from the claim text.