Hydraulic master cylinders

Details Hydraulic master cylinders Hydraulic master cylinders

1981-02-27

1983-12-13

Hershkovitz, Abraham

Power plants

Pressure fluid source and motor

Pulsator

60576, 60579, 60589, B60T 1120

Patent

active

044198620

ABSTRACT:
A master cylinder for a hydraulic brake system includes a piston which divides a primary bore into a primary chamber and a secondary chamber. The piston rod sealingly slides in a secondary bore of smaller cross-sectional area than the primary bore. An expander piston sealingly slides in a bore and defines a primary expander chamber and a secondary expander chamber. In use, initial movement of the piston causes fluid to be displaced from the primary chamber to the brake circuit at a rate corresponding to the area of the primary bore. When the pressure in primary chamber becomes sufficiently large the expander piston is moved to the right against the bias of a spring to allow fluid to flow out of primary chamber into primary expander chamber via a passage. An equal volume of fluid is displaced from secondary expander chamber into secondary chamber via a passage. The effect is to reduce the effective cross-sectional area of the piston to that of the piston rod and thereby allow a higher pressure to be generated for a given input force.

REFERENCES:
patent: 2015511 (1935-09-01), Bowen
patent: 2637977 (1953-05-01), Seppmann
patent: 3032996 (1962-05-01), Foreman
patent: 3237411 (1966-03-01), Taft

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