GB435497A - Transmission and change-speed mechanism - Google Patents

Abstract

435,497. Variable-speed gearing. RILEY, P., Castle Works, Aldbourne Road, Coventry. May 26, 1934, No. 15738. [Class 80 (ii)] Relates to gearing having coaxial driving and driven shafts, a layshaft parallel thereto and three constantly-meshed gear pairs of which some of the gears are free, two double-acting clutching systems being provided to give four forward speeds, a clutch of each system being engaged for each speed, one of the systems being arranged beyond the end of the layshaft. According to the invention, the other clutching system is arranged between two of the constantly meshed gears and comprises two dog clutches. Driven, intermediate and driving shafts 12, 14, 16 are coaxial and spigotally connected, a short parallel layshaft being provided at 17. The layshaft has two fast gears 18, 19 and a free gear 20, permanently in mesh with a gear 21 fast on the driving shaft. The gear 18 is permanently in mesh with a gear 22 fast on the intermediate shaft 14 and can be locked to the free gear 20 by a dog clutch sleeve 23. The gear 22 can be clutched to the driving shaft by a dog clutch sleeve 24. The other fast gear 19 on the layshaft is permanently in mesh with a gear 25 free on the intermediate shaft. This gear is formed with a sleeve 26 carrying fast thereon the hub 27 of a clutch member 28 which carries dog clutch teeth 29. A similar clutch member 30 is fast on the intermediate shaft 14. Surrounding these two clutch members is a double-acting clutch member splined at 32 to the driven shaft. This member comprises a sleeve 33 with striking collars 34, grooves 35 to coact with balls 36 to locate the member and flanges 37, 38 bolted together with the interposition of a plain ring 39. In these flanged portions are sets of dog teeth 40, 41 adapted to engage the teeth 29, 31. The outer or female clutch members 42, 43 are formed as rings having lugs 44 lying in slots in the flanges 37, 38. Through each of these lugs passes a bolt 46 having a shoulder 47 engaging a lug of the member 42, a compression spring 48 being interposed between the lug of the'other member 43 and the head 49 of the bolt, the head sliding in a part 50. First speed is by way of 21, 20, 18, 19, 25, 28, 29, 40 and 12, the intermediate shaft 14 rotating idly. For second speed clutch 24 is used and the drive is by way of 21, 24, 22, 18 and then as for first speed. For third speed and direct drive, the dog teeth 31, 41 are engaged, the drives being respectively through dog clutches 23 and 24. The sleeve 33 is preferably connected with the main clutch and the members 42, 43 are applied by the ring 39 under the pressure of the springs 48. In a modified form of clutch, the synchronizing friction members are arranged outside the dog tooth members 40, 41. In each gearchanging operation, the clutch sleeves 23, 24 are engaged, whilst the associated members are isolated from the drive. Specifications 423,454 and 423,455 are referred to.