GB415076A - Improvements in or relating to variable speed power transmission mechanism - Google Patents

Abstract

415,076. Variable-speed friction gearing ; lever linkages. CLOUDSLEY ENGINEERING CO., Ltd., 5, Chancery Lane, London, and HAYES, F. A., Middletown, New Jersey, U.S.A. Feb. 16, 1933, No. 4746. Convention date, March 4, 1932. Addition to 344,064. [Classes 80 (ii) and 80 (iii).] The parent Specification describes variable-speed gearing with toric discs and twin sets of precessional rollers in which the load is equalized between the rollers of each set by a freely-wabbling ring. The control of the speed is applied by turning the wabble ring 35 of the first set. This invention is to apply turning alone to the wabble ring 35, for controlling, without any radial forces. This is effected by a balanced linkage 164, 169, 165 all on one side of the driving-shaft 12 of the gearing. The gearing comprises two end toric discs on the shaft 12 of which one only, disc 10, is shown in Fig. 3. The gearing is non- epicyclic and the spiders 25 which support the two sets of rockers 28 of the twin sets of precessional rollers 18 are directly connected to the gear casing as described in Specification 392,589. The spiders 25 also support a sleeve 13<a> which forms a bearing for the driven double toric disc 15. The equalizing ring 35 of the first set is connected to a like ring, not shown, of the second set by a sleeve 13b which is free to wabble. Precession is initiated by rocking the rockers 28, Fig. 1, through fingers 34 which engage the ring 35, and the object is to control by applying a turning moment only to the ring 35. The ring 35 is connected by arms 36 to an outer wabble ring 37 which is carried by the upper ends of two swing links 164 which are connected at their lower ends by ball joints 168 to an H-shaped floating beam 169, Fig. 2, which is free to move up and down as well as to rock. The other limbs of the H are hinged at 167 to a balance beam 165 which can swing about a fixed pivot pin 166. The gearing is torque-responsive and the load reaction depresses the left arm of the beam 165 so that by resisting this depression by a spring 170, Fig. 1, the gearing is rendered automatic. The upper limit of the speed range is determined at will by a hand lever 176 in the path of the right arm of the beam 165 and lockable at 181. Overload depresses the left arm of the beam 165 far enough to strike a pin 171 which stops the engine by suitable means such as by breaking an ignition circuit at 173.