GB281983A - Improvements in automatic change speed gears - Google Patents

Abstract

281,983. Aktiebolaget Spontan. Feb. 16, 1937, [Convention date]. Variable-speed and reversing ratchet gearing which varies automatically with the load and comprises an element 8, Figs. 1 and 2, to which alternate positive and negative impulses are imparted, the latter being transmitted to a stationary part 31, comprises also a mass 26, or group of masses, resiliently connected to the stationary part to which the damped negative impulses are transmitted. High frequency vibrations are eliminated and it is possible to reverse the one-way devices while in motion, there being a reversible roller clutch A and a like reversible detent B. In the arrangement shown, planetary eccentric masses 7 alternately in opposite phase carried by planet-gears 4 in a driving fly-wheel 2 impart the alternating impulses to a central gear 5 in a yielding manner so as to effect the automatic variation. The gear 5 is fast on the sleeve 8, which envelops both one-way devices. The clutch A drives a sleeve 9 fast on a driven shaft 12 and the detent B comprises a central substantially stationary sleeve 10. The sleeve 10 is connected through a flange member 25 to the characteristic shock-absorbing massive ring 26, which is in turn connected through radial spiral springs 29 to the normally-stationary member 31 which takes the negative impulses through detent B. There is a fly-wheel 23 fast on driven shaft 12 and a fixed enclosing casing 24. In Fig. 10 is shown an alternative arrangement of masses 26, 26' one within the other and connected by springs 54, 55 to one another and to the abutment 31. The means for effecting reversal of drive while in motion is shown in Figs. 1 and 3. Reversal of each grip device A and B is effected by a relative turning of its grip-roller cage, and the cages are operated in unison by the axial sliding of coupled cam sleeves 16, 17 as described in Specification 276,853. This is effected by sliding a sleeve 18 outside the sleeve 8, and this is effected in turn by turning a shaft 40 having a crank 49 in a ball-bearing 50. The abutment 31 is normally held fast by a pivoted spring- pressed locking lever 45. The reversal has to be effected quickly while the abutment 31 is free to turn. To this end, the shaft 40 carries a shaped cam 44 adapted to engage the lever 45 and to disengage it to free the abutment 31 just prior to a quick shift of the sleeve 18. This is done by the shape of the cam 44 together with a spring somewhere in the control. The shaft 40 is turned by a speed-multiplying pair 41, 42 operated from a wheel 43, which may be spring-held by a catch 56, Fig. 6, to effect a quick operation after the catch slips.