Rotary shafts – gudgeons – housings – and flexible couplings for ro – Speed responsive device for adjusting relative rotational... – Pivoted weight
Patent
1991-10-04
1994-08-16
Stodola, Daniel P.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Speed responsive device for adjusting relative rotational...
Pivoted weight
475 91, F16D 310
Patent
active
053382587
ABSTRACT:
A start-up coupling engages progressively in two stages. During the first stage drive is transmitted from an input shaft (3) along respective paths (8,7,9,12,11,10,25 and 26; and, 19,20,19 and 32) to helically-toothed rollers (27,30) which mesh but are designed to be incapable of transmitting drive between them, or of doing so very inefficiently. The rollers (27,30) are mounted in an oil-filled chamber (18) in a casing (1) integral with an output shaft (2). During the first hydraulic stage of engagement, oil pockets between their oppositely-moving teeth (28,31) prevent them from engaging as the phase of one roller (27) is progressively changed by a centrifugal adjustment (4) against the bias of a torque cell (19). However, increasing frictional resistance in the oil pockets causes the rollers (27,30) to exert an increasing rotational torque on the casing (1). Simultaneously, the relative movement of the roller teeth diminishes to reduce the hydraulic pressure in the pockets to a level where the pockets collapse. This initiates the second stage of engagement when drive is transmitted through the coupling mechanically by way of rubbing of the roller teeth (28,31). This rubbing ceases when engagement of the coupling is completed. Tooth wear is lessened by the two stages of engagement.
REFERENCES:
patent: 2727608 (1955-12-01), Smith
patent: 2743628 (1956-05-01), Scharaffa
patent: 4176522 (1979-12-01), Holtzapple et al.
patent: 4535737 (1985-08-01), Takami
IVG Australia Pty. Ltd.
Stodola Daniel P.
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