Hydraulic torque impulse generator

Details Hydraulic torque impulse generator Hydraulic torque impulse generator

1991-06-28

1992-09-15

Stodola, Daniel P.

Rotary shafts, gudgeons, housings, and flexible couplings for ro

Fluid coupling

For transmitting limited pulsating torque

B25B 2102, B25D 1500

Patent

active

051472457

ABSTRACT:
A hydraulic torque impulse generator comprises a hollow drive member (21) connected to a rotation motor (16) and comprising a fluid chamber (24) with axially extending seal lands (35, 36) and seal ridges (40, 41) on its peripheral wall for sealing cooperation with radially movable seal elements (33, 34) and axially extending seal ridges (38, 39) on an output spindle (18, 22) to divide the fluid chamber (24) into high pressure compartments (H.P.) and low pressure compartments (L.P.) during short intervals of the relative rotating between the drive member (21) and the output spindle (18, 22). The fluid chamber (24) is defined also by two opposite end walls (25, 28), one (25) of which comprises an annular, nonresilient contact element (37) which is axially displaceable between an active seal position in which it is urged against the seal elements (33, 34) and shoulders (43, 30) on the spindle portion (22) and the fluid chamber wall (20), respectively, and a rest position. In the latter position, the axial clearances between the spindle shoulders (42, 43) and vanes (33, 34) on one hand and the end walls (28, 25) of the fluid chamber (24) on the other is allowed to increase such that a substantially reduced viscous friction between the parts is obtained.

REFERENCES:
patent: 4767379 (1988-08-01), Schoeps
patent: 4785693 (1988-11-01), Minamiyama
patent: 4884995 (1989-12-01), Schoeps

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