GB282784A - Improvements in toothed gears for angular transmission, and a method of, and apparatus for, the cutting thereof - Google Patents

Abstract

282,784. Klingelnberg, G. A., and Klingelnberg, M., (trading as Klingeinberg S÷hne, W. F.). Dec. 27, 1926, [Convention date]. Gear-cutting; milling. cutters.-In skew-toothed gearing, a pinion 1, Figs. 1 and 2, of cylindrical contour turning on an axis 38, 39, gears with a plane crown-wheel 2 turning upon an offset axis x. The teeth of be wheel 2 are of involute form longitudinally for correct gearing and are of varying profile from the end 38, shown in Fig. 3, to the end 39, shown in Fig. 4. The variation of profile is such that the lineal speed of the point 8 of contact on the pinion 1 decreases from the point 38 to the point 39 to the same extent as the corresponding decrease of the lineal speed of the wheel 2 between the points 38. 39. The pinion and wheel are both produced by a conical worm cutter representing the teeth of an " ideal " crown-wheel, of which the dimensions and situation relatively to the pinion and wheel are determined by a method, shown in Fig. 7. based upon the involute formation of the length of the wheel teeth. The centre 35 of the " ideal " crown-wheel lies on the axis 38, 39, 31 of the pinion 1 and is so placed that an arc struck thereabout touches the normals 36, 37 at the points 38, 39 to the length of the involute teeth on the wheel 2. the centre of which is at 30. The position of the cutter 34 is shown with its axis of rotation lying upon the line 36. During the cutting of the wheel 2. the wheel blank and cutter each rotates upon its own axis, and in cutting the pinion 1 the cutter also swings about the centre 35, in which motion its inner edge has a linear velocity less that that of the pinion J at the point 39. this difference of velocity producing the thinning of the inner ends of the teeth of the pinion. The gears are produced in the machine shown in Fig. 8. in which the cutter 51 turns on a spindle 70 in a toolcarrier 52 adjustable about a pivot 54 in a head a carried in a disc 53 rota.table a.bout the axis of a shaft 56. The blank 58 is carried on an axis 100 on a work-support 50. which is adjustable towards and at right-angles to the shaft 56 and about its own vertical axis, so that it may be set to the required position. The cutter-shaft 79 is connected by gearing 78. 77, 75, 74, 73, 72, 68 to the shaft 56, which is driven through speed-gearing 61 by the main driving-pulley 59. A bevel wheel 66 on the shaft 56 drives one member of a differential 80, a second member of which drives the blank 58 through the shaft 87, bevel gearing 83, 86, 92, 95, speed-gearing. and the worm 98 and worm-wheel 99. The shaft 87 also rotates the disc 53, carrying the head a through worm gearing 101, 102, &c. actuating a worm 106 driving a worm-wheel b secured to the disc. To conform to the revolution of the cutter 51 produced by the rotation of the disc 53, an additional rotation is superimposed upon the blank 58 by gearing the shaft 105 of the worm 106 through speed gearing to the worm 109 driving the box of the differential 80. According to the Specification as open to inspection under Sect. 91 (3) (a), the pinion mav be replaced bv a worm, in which case the cutter for the crown or worm wheel takes the form of a hob representing the worm. This subject-matter does not appear in the Specification as accepted.