Power plants – Pressure fluid source and motor – Pulsator
Patent
1989-06-16
1991-05-14
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60588, 92 13, 92 1341, F15B 700
Patent
active
050145142
ABSTRACT:
A method is suggested for assembling a tandem master cylinder and a vacuum brake booster of a hydraulic brake system for automotive vehicles. Air is injected via the pressure connection (19) of the pressure chamber (18) associated with the push-rod piston (2). Simultaneously, the push-rod piston (2) is moved in the direction pointing away from the brake pedal. The pressure increase in pressure chamber (18) is measured during the movement of the push-rod piston and, thus, during the movement of the central valve (6) accommodated in the push-rod piston. As soon as the closure member (5) of the central valve is seated on the valve seat (4), thus the central valve being closed, the air pressure will increase in the chamber (18). In the curve of the "pressure-against-central-valve-travel" diagram, which curve indicates the pressure increase, a trigger point is established which determines a measured distance on the abscissa of the diagram. Said measured distance is the standard for the number and/or dimensioning of spacing washers (8) to be arranged between the pressure element (9) and the push-rod piston in order to achieve a reduction of the lost travel of the central valve. By means of this invention, an elegant method in conformity with the demands of automation is achieved for assembling a tandem master cylinder and a vacuum brake booster and for simultaneous reduction of the lost travel of the central valve.
REFERENCES:
patent: 4229940 (1980-10-01), Higgerson
patent: 4307570 (1981-12-01), Yardley
patent: 4433543 (1984-02-01), Thomas et al.
patent: 4453380 (1984-06-01), Meynier
patent: 4474004 (1984-10-01), Thomas
patent: 4732002 (1988-03-01), Farr
Hayn Holger V.
Reinartz Hans-Dieter
Steffes Helmut
Alfred Treves GmbH
Denion Thomas
Lewis J. Gordon
Look Edward K.
Seitter Robert P.
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