Liquid pressure booster
AssigneeJidosha Kiki Co., Ltd.
InventorMichio Kobayashi
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Abstract
An improvement of a liquid pressure booster provided with a reaction piston is disclosed. A guide formed on a housing (plug) is caused to project into a tubular section of a power piston. A reaction piston is slidably supported by the guide, and an input shaft is slidably supported by the reaction piston. A spring which urges the reaction piston is disposed in a clearance defined between the outer periphery of the guide and the inner periphery of the tubular section of the power piston. In this manner, the guide, a sliding portion of the reaction piston, a sliding portion of the input shaft and the spring can be disposed radially of each other while overlapping each other in the axial direction to minimize the axial size of the liquid pressure booster.
Claims10
A liquid pressure booster including a power piston slidably disposed in a housing and including a tubular section at its rear portion, a power chamber defined within the housing to the rear side of the power piston, an input shaft slidably extending into the housing through the rear portion of the power piston, said input shaft having a head, a control valve disposed between the tubular section of the power piston and the head of the input shaft for supplying a liquid pressure to the power chamber in accordance with an input load applied to the input shaft, a reaction piston slidably disposed around the input shaft and responsive to the liquid pressure within the power chamber to be retracted relative to the input shaft for abutment against a stopper mounted on the input shaft, said reaction piston having a forward end, and a spring disposed between the power piston and the reaction piston and exhibiting a given resilience to maintain the reaction piston at an advanced position spaced from the stopper;
- characterized in that the housing is provided with a guide which projects into the tubular section of the power piston, the reaction piston being slidably fitted with the guide to be supported thereby in a slidable manner, the input shaft being slidably fitted into an axial portion of the reaction piston to be supported thereby in a slidable manner, the spring being disposed in a clearance defined between an outer periphery of the guide and an inner periphery of the tubular section of the power piston.
Dependencies are inferred from the claim text.