Power plants – Pressure fluid source and motor – Pulsator
Patent
1982-09-27
1984-08-28
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Pulsator
60578, 60586, 60589, 60592, 60593, 92 131, 92 605, 188153R, 188196A, 188347, 188348, F15B 704
Patent
active
044676050
ABSTRACT:
A two-stage, hydro-pneumatic actuator suitable for use as a railway vehicle brake. The hydraulic cylinder comprises a large diameter bore in which a low- and a high-pressure piston operate jointly during a first stage of operation to effect a high volumetric displacement of hydraulic fluid via a small diameter bore in order to take up the clearance between the brake shoes and wheel. As the brake shoes contact the wheel, the high-pressure piston enters the small bore to interrupt further displacement of hydraulic fluid from the large bore. The force of the high-pressure piston alone during this second stage of operation produces the required brake forces with a high multiplication factor. Make-up fluid is drawn into a chamber on the backside of the low-pressure piston during a brake application stroke an amount corresponding to the over-travel of the high-pressure piston and is subsequently discharged into the hydraulic cylinder during retraction of the brakes to compensate for brake shoe wear. Following brake shoe replacement, a pressure relief valve back dumps excess hydraulic fluid from the large diameter bore to the reservoir when the brake shoes engage the wheels prior to the high-pressure piston entering the small diameter bore.
REFERENCES:
patent: 2106304 (1938-01-01), McGee
patent: 2311787 (1943-02-01), Swift
patent: 2917900 (1959-12-01), Kirk
patent: 3191384 (1965-06-01), Krusemark
patent: 4208881 (1980-06-01), Brademeyer et al.
patent: 4288987 (1981-09-01), Grullmeier
Falce Gary J.
Garrett Robert E.
Moritz Scott L.
WABCO Ltd.
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