Patent GB-419171-A (GB)
Title: Improvements relating to clutching and braking devices, particularly for variable speed or reversing gears
IPC: F16H61/02
Filed: 1933-12-08
Abstract: 419,171. Variable-speed and reversing gearing; clutches ; toothed wheels. BRASE, W., 34, Am Treptower Park, Berlin. Dec. 8, 1933, No. 34602. [Classes 80 (i) and 80 (ii).] A clutch or brake, particularly for epicyclic variable-speed or reversing gearing, comprises a spring-ring or rings 34, Fig. 6, encircling gripping levers 27, or resilient tongues, carried by one coupled member 5, the rings being adapted to be rolled axially over the levers to press them into frictional engagement with a stationary or rotatable coupled member 29 or 19. The twospeed gear shown in Figs. 6 and 10, two, three or four of which may be combined in series and used with separate reversing-gear, not shown, comprises a driving sun-wheel 2, a driven annulus 19, and planet - wheels 3, 4 mounted on roller-bearings 7 on eccentric discs 11, 12, bolted to cheek-plates 5, 6, forming the planet-carrier. The planet-wheels are axially offset and have open-ended teeth 17, Fig. 10, engaging internally with the sun 2 and externally with the annulus 19. The periphery of the planet-carrier 5 is grooved to give rocking support to the levers 27, which have depending teeth to wedge into ribs of a stationary brake ring 29 for reduced speed, or of the annulus 19 for solid drive. The surrounding helical spring-rings 34 are carried in a partitioned guard-ring 35, by which they are operated axially, and in the neutral position they rest inoperative on the central parts of the levers. As shown in Figs. 2 and 4, two such two-speed gears, of the same or different ratio, are used in series the two operating rings 35 being operated, through side-rollers 39, parallel arms 56, 57, ball-joints 59, and a cross-link 60, by a fork 62 on the lower end of a hand-lever 65 which is moved both fore-and-aft, and turned. The gear may be used with or without a mainclutch in a motor-vehicle. The simple spur or bevel reversing-gear shown in Fig. 12 comprises a planet-carrier 73 carrying an axially-slotted resilient steel drum 74, which is clutched, by means of the surrounding spring-ring 34, either with a driven drum 78, for solid drive, as shown, or with a stationary brake-drum 81, for reverse, in which the planet-wheels drive the disc 78 through an Oldham coupling 76, or through chain-gearing. The periphery of the disc 78 may be slightly conical and the part of the drum 74 which clutches it may be directly engaged by a part of the guard-ring 80 of the spring-ring 34. In one form, Fig. 13, not shown, for use only as a brake, a spring ring acts on a stationary resilient band similar to 74, Fig. 12, with the exception that it is helically, instead of axially, slotted. The spring-rings 34 may be multistart, being formed by pressing into each other the individual turns of several annular coils of a helical spring, and attaching together its two ends as shown in Fig. 11. To reduce the effect of centrifugal force in a side-by-side two spring-ring arrangement, one spring-ring may be made heavier than the other, to react, through a pivoted plate, on the lighter ring and increase the engaging pressure of the latter.