Patent GB-454315-A (GB)
Title: Improvements in automatic change-speed transmissions
IPC: F16H61/02
Filed: 1934-12-22
Abstract: 454,315. Variable-speed gearing. BANKER, O. H., 5548, Glenwood Avenue, Chicago, U.S.A. Dec. 22, 1934, No. 36857. [Class 80 (ii)] Variable-speed gearing comprises a gear 14, Fig. 1, integral with the driving shaft 10 and meshing with a gear 22 connected to a countershaft 19 through a one-way clutch 52 and to a gear 26 through a one-way clutch 53, a gear 24 loose on the driven shaft 15 and meshing with the gear 26, and a gear 23 fixed on the shaft 15 and meshing with a gear 25 adapted to be connected to the shaft 19 through a claw clutch 38, 39 so as to give low speed, intermediate and high speeds being brought in by moving dog clutch members 60 and 61, splined on the shaft 15, into engagement with dogs on the gears 24 and 14 respectively. The end faces of the dogs are chamfered. Reverse is brought in by disengaging the clutch 38, 39 and sliding an idler gear 28 into mesh with gears 27 and 29 on the shafts 19 and 15 respectively. Weighted bell-crank levers 87 carried by the gear 29 act centrifugally through slidable sleeves and a fork 94 to turn a shaft 75 against the action of a spring 96, Fig. 5. Forks 67, 69 controlling the members 60, 61 are carried by shafts 70, 72 which have arms 71, 74, Fig. 6, through which pass rods 77, 82 connected to arms 76 on the shaft 75, the arms 71, 74 being urged against collars 79, 84 on the rods by springs 80, 85. Thus at a predetermined vehicle speed in low gear, the members 60, 61 are urged apart by the springs 80, 85, but neither clutch engages. On decelerating the shaft 10 until the gear 24 is in synchronism with shaft 15, the intermediate-speed clutch 60 engages. On decelerating the shaft 10 further until it is in synchronism with shaft 15, the high-speed clutch 61 also engages. Manual control of the shaft 75 can also be effected through a Bowden cable 751 connected to an arm 95<1> on the shaft 75. Change from high to intermediate speed can be effected by depressing a pedal 125, Fig. 5, whereby an arm 73 on the shaft 72 is turned by a spring 131 surrounding a rod 128 connected to the pedal. The movement of the pedal is so limited by a stop 134 that the member 61 remains partially engaged, as shown in Fig. 7, so that, while the shaft 15 can drive the shaft 10, the latter cannot drive the former. If desired, the rods 77, 82 may be so adjusted that the members 60, 61 are normally both in partial engagement, as shown in Fig. 7. Such partial engagement serves, with the engine stopped and the clutch 38, 39 engaged, to lock the shaft 15 against reverse rotation. The one-way clutch 53 may be locked out by a claw clutch 47, so as to lock the gear in second speed. A disc 113, Fig. 4, secured to a control shaft 110 has cam-slots 114, 115 engaged by rollers 117, 118 carried respectively by a slidable fork 101 controlling the member 38 and by an arm 119 on a shaft 109 having a fork 108, Fig. 1, controlling the idler gear 28, while a slidable spring-pressed fork 104 controlling the clutch 47 carries a roller 120 cooperating with the cam surface of the disc. The arrangement is such that as the shaft 110 is turned clockwise, the clutch 38 is engaged. Further clockwise movement causes the clutch 47 also to engage. On the contrary, anticlockwise movement engages the reverse gear. A pivoted latch 122, operated by a camed part of the fork 104, may co-operate with a lug 124 on the shaft 72 so that when the gear is locked in second speed, the high-speed clutch 61 is held disengaged. Similarly, a pivoted latch 1221, operated by the cam surface of the disc 113, may co-operate with lugs 124 on both shafts 70, 72 so as to hold both high-speed and intermediate-speed clutches 61, 60 disengaged when the gear is in neutral or reverse. Specification 454,367 is referred to.