GB220331A - Improvements in and relating to variable-speed gearing - Google Patents

Abstract

220,331. Erban, R. Aug. 10, 1923, [Convention date]. Variable-speed friction gearing; controlling; reversing - gearing. -The variable-speed gear comprises two sets of rollers 3, 3<1>, Fig. 9, arranged in series, which rollers are tilted to vary the speed. There is a single wedging device for the two sets to maintain frictional thrust, which comprises balls 4 in inclined recesses through which the power passes, the balls tending to ride out of the recesses as described in Specification 189,799, [Class 80 (i), Gearing, Belt, &c.]. The rollers 3 &c. are preferably supported in segmental blocks 16. 17, Figs. 3 and 4, which are supported with radial play in slots 8<1> in a carrier 8. The tilting is effected by arms 18, Fig. 9, the arms 18 of each set being connected to a control disc 46, or 46<1>, each connection being a fine screw 2,2 by which adjustment can be made tc distribute the load. The control discs 46, 46<1> of the two gear sets are operated through levers 48, 48<1> resting on cams 49, 49<1> operated by a control lever 50. This lever 50 may be operated manually or automatically or both. Thus the lever 50 may be connected through a damper 54, Fig. 10, to a point 63 in a lever 62, the position of the point 63 determining the speed ratio. The upper end of the lever is connected to an arm 57 which is moved automatically by the resistance of, say, a vehicle acting against a spring 58. The lower end of the lever 62 is connected to the accelerator pedal 61. Position 63<1> corresponds to the highest speed. Reversed driving takes place when balls 31, Fig. 9, are restrained against planetary motion when a brake 35 is applied to a cage 32 supporting the balls. The balls are kept pressed between driving and driven discs 6, 1 by the wedging device 4. When a clutch 33 is brought into action, the train 6, 31, 1 turns solid for the forward drive.