Self-energizing snubber for a hydraulic motor

Details Self-energizing snubber for a hydraulic motor Self-energizing snubber for a hydraulic motor

1994-02-17

1995-05-09

Look, Edward K.

Motors: expansible chamber type

Working member position responsive motive fluid control

Exhaust control

92 85B, F15B 1522, F01B 1500

Patent

active

054130301

ABSTRACT:
Snubbers are useful in dampening inertia loads at the end of stroke movement of a hydraulic motor. The known snubbers usually restrict fluid flow therethrough in the non-snubbing mode thereby slowing the response of the motor in the opposite direction. The subject self-energizing snubber includes a snubber piston which is moved from a first operative position to an intermediate operative position by contact with an end surface and then hydraulically moved to a second position by differential pressure established between an actuating chamber and a fluid passage. The snubber piston defines a variable rate flow path continuously communicating the actuating chamber with the passage. A maximum flow rate is established through the flow path at the first operative position while a minimum flow rate is established through the flow path at the second operative position. An intermediate flow rate is established through the flow path at the intermediate operative position with the intermediate flow rate selected to establish the pressure differential between the actuating chamber and the passage.

REFERENCES:
patent: 2778343 (1957-01-01), Crosetto et al.
patent: 2991759 (1961-07-01), Pilch
patent: 3592108 (1971-07-01), Rosaen
patent: 3677141 (1972-07-01), Lagerqvist et al.
patent: 3845694 (1974-11-01), Berg
patent: 3998132 (1976-12-01), Rasigade
patent: 4250793 (1981-02-01), Berg
patent: 4440068 (1984-04-01), Tootle

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