| 摘要 |
472,016. Variable speed gearing. BERLIN, D. W. Dec. 14, 1936, No. 34312. [Classes 80 (ii) and 80 (iii)] Relates to automatically-variable changespeed gear devices of the kind with centrifugal weights drawn round over eccentrics which transmit alternating impulses through oneway friction ratchets or grips, and particularly to means comprising a centrifugal governor to prevent wear in these ratchets when idling on high-speed direct drive. In Fig. 1 is shown the application to the gear device described in Specification 422,368 in which 1 is the sleeve which carries the eccentrics to which the alternating impulses are imparted. The forward impulses are transmitted directly to a driven shaft 2 through one-way grip rollers 8 ; the rearward impulses are transmitted as forward impulses through one-way grip rollers 9, through a reversing train 4, 5, 6, and through one-way grip rollers 10. The idlers 5 are non-planetary being upon fixed supports, and the high-speed direct drive takes place through the jammed rollers 8 with both sets of rollers 9, 10 overrunning. A centrifugal governor 14 carried by the driven shaft 2 eases the engaging springs 22, Fig. 10, not only of the overrunning rollers 9, 10, but also of the jammed rollers 8. The expanding weights 14, Fig. 1, act against a spring 17 and through a U-shaped fork 13 and ring groove 13b to thrust a muff 12a leftwardly. The muff 12a has ring groove connections with radial pins 12b which are constrained to turn with the shaft 2 by straight grooves 12c therein. The pins 12b pass through inclined slots 12d, Fig. 5, in a double-ended roller housing 11, and this axial shift of the muff causes an angular shift of the housing 11 relatively to the shaft 2 which releases the spring pressure on both sets of central rollers 8, 10. The outer set of rollers 9 are likewise released by the angular displacement of their housing 12 by pins 12f engaging inclined slots 12g in the housing and carried by a drum 12h having a straight-groove connection 12i with annular grip flange 3 of the gear 4. There is described with reference to Figs. 2 and 6 (not shown), an application to the gear device described in Specification 413,039 in which the idle toothed gears corresponding to the gears 5 of Fig. 1, are supported in a revoluble abutment member which turns solidly forwards during direct drive. |
