Patent GB-412757-A (GB)
Title: Improvements in change speed gearing
IPC: F16H61/02
Filed: 1933-05-03
Abstract: 412,757. Change speed gearing. CLAYTON, A. C., 64, Church Road, Willesden, London. May 3, 1933, Nos. 12939 and 23576. [Class 80 (ii).] A change-speed gearing for motor-propelled vehicles &c. comprises a plurality of connected or integrally-formed planet pinions 9, 13, 10 which are mounted on a rotary carrier 6 with some in geared connection with sun-wheels 4, 5 on input and output shafts 1, 2 respectively and with one or more geared to one or more annular wheels 14, 15, the latter wheels and the carrier being adapted to be arrested and freed selectively. Fig. 1 shows the gearing in neutral condition, the pinion 10 meshing with the wheel 5 and all the members 6, 14, 15 being free to rotate. Three speed changes can be effected by the arrest of any one of these members, or a direct forward drive by shifting the wheel 5 into mesh with both the pinions 13 and also a pinion 11, mounted on carrier 6 to mesh with the pinion 13 and the wheel 15, and freeing all the members. A reverse drive is effected by moving the wheel 5 axially into mesh with the pinion 11 and simultaneously arresting one of the said members according to the speed required. The arrest of each member is produced by one of two spring-pressed pawls 26, 29, depending upon the direction of rotation of the member, which may be engaged with ratchet notches 20, 21 on the periphery thereof. The pawls are mounted on a shaft 130 and are controlled by a cam device 49 on a shaft 48 which is geared to a second shaft 531 provided with a selecting lever 46 having a pointer 52 moving over a graduated dial 53 ; the shaft 48 also controls the axial movement of the wheel 5, effected by a yoke 79 pivoted on a shaft 59, through a cam 98 located thereon. A clutch 60, 62, actuated by a pedal 64, is located between the engine shaft 61 and the shaft 1, and the action of disengaging it is utilized to operate a sleeve 45 by means of links 66, 67 secured to the pedal 64 to disengage any pawl which may have been operative and hold all of them inoperative until the selection of the required pawl has been effected by the lever 46, whereupon re-engagement of the clutch permits the selected pawl to operate. Similarly the action of re-engaging the clutch is utilized to effect axial movement of the output wheel 5, by means of the links 66, 67 and yoke 79, when required and after the lever 46 has been set to determine the amount of this movement. To facilitate gear changing a second clutch 71, 72 is provided between the input shaft 1 and the carrier 6, this clutch being engaged when the engine clutch is disengaged and vice versa. Fig. 23 shows a modification for use when only one speed in reverse is required. Movement of the wheel 5 is dispensed with by providing a clutch device 114 which is slidable on the shaft 2 and splined to a sleeve 81 connected to the propeller shaft and is adapted normally to engage a sleeve 113 secured to the shaft 2 for forward speeds but which is moved to engage both the sleeve 113 and an extension 110 of the carrier 6 for a direct drive or the extension 110 only for a reverse drive. In the latter case the wheel 15 is arrested.