GB409484A - Improvements in power transmission mechanism - Google Patents

Abstract

409,484. Variable-speed gearing. BENDIX AVIATION CORPORATION, 105, West Adams Street, Chicago, U.S.A. Feb. 24, 1933, No. 5681. Convention date, March 30, 1932. [Class 80 (ii).] A transmission mechanism including a clutch operated by centrifugal members for connecting driving and driven shafts in one speed ratio has means for connecting the shafts in another speed ratio comprising mechanism adapted to contact the centrifugal members and move them into inoperative position. As shown, gearing, connecting a driving shaft 10 with a driven shaft 19, includes a loose sleeve 49 which is splined to a friction clutch housing 33, to a sleeve 68 coarsely threaded to the hub 56 of an over-running clutch, and to a coupler 53. A countershaft 84 has a gear 88 engaging a pinion 13 on shaft 10, a gear 89 engaging teeth 52 on the outer member of the over-running clutch, and a gear 91. The over-running clutch includes rollers 57-60, Fig. 5, acted upon by a spring-urged block 62 located in a tapered groove 63 by a member 64 fixed to the hub 56. The sleeve 68 carries a ring 71 abutting centrifugal weights 43 pivoted to the clutch housing 33 and is subjected to a compression spring 70. A spring 74 on the hub 56 is held compressed by a stop 77. The frictionclutch plates have a backing plate 36 supported by springs 37, and light springs 46 tend to move the weights 43 outwardly. The clutch plates 29 splined to the shaft 10 have radial slots extending inwardly from the outer periphery beyond the central hole in the clutch plates 32 fixed to the housing 33, and the latter has openings in its periphery to permit the squeezing out of oil from between the clutch plates as the clutch is put into engagement. A slidable gear 21 is splined to the driven shaft 19. In operation, for a forward drive, the gear 21 is slid so that teeth 82 thereon engage teeth 81 on the coupler 53. A direct drive takes place through the members 33, 49, 53, 21, to the driven shaft 19, the roller clutch over-running. If the friction clutch slips, a drive at reduced speed takes place through the members 13, 88, 89, 52, 57, 56, 68, 49, 53, 21, 19. The hub 56 due to its threaded engagement with the sleeve 68 moves the latter to the left so that the ring 71 moves the weights 43 inwardly and the friction clutch is disengaged although the housing 33 is still rotated by the sleeve 49. Upon increase of speed the weights 43 move outwardly to force the sleeve 68 to the right and engage the friction clutch so that a direct drive again occurs, the roller clutch over-running. At a certain speed the ring 71 abuts the compression spring 74, and further outward movement of the weights 43 is prevented until a predetermined further increase in speed occurs. If the gear 21 is moved to engage the teeth 82 with teeth 83 on the gear 52 the engine may act as a brake while the transmission is in second gear. Engagement of the gear 21 with a loose pinion 92 gearing with the gear 91 gives a reverse drive.