Patent GB-1502167-A (GB)
Title: Gear testing and lapping machine
IPC: B23F19/02
Filed: 1975-06-25
Abstract: 1502167 Gear testing machine WERKZEUGMASCHINENFABRIK OERLIKON-BUHRLE AG 25 June 1975 [28 June 1974] 26992/75 Heading G1M [Also in Division B3] A testing machine for bevel and hyperboloidal gears comprises a machine bed 10, Fig. 1, two headstocks 17 each having a work spindle 18, means for displaceably mounting at least one of the headstocks on the bed, a manually actuable device 28, Fig. 4, for displacing at least one of the headstocks, the machine being usable as a lapping machine by the provision of an automatic device 40, 41 for displacing at least one headstock, an automatic device 51, 52 for displacing at least one work spindle in its axial direction, and by means 143 for disconnecting the manually-actuable headstock-displacement device. The headstocks 17 are parts of respective components 11, 12, headstock 17 of component 11 being vertically adjustable along guideways 34, 35, Fig. 3, on a housing 19 by rotation of a hand wheel 20, the housing being carried by a carriage 16 adjustable along guideways 31, 32 by a hand wheel 21. The headstock 17 of component 12 is adjustable along guideways 35, 36 by a hand wheel 22 connected by gearing 27 to a screw 28 engaging a nut 143 on the headstock. The headstock is supported by hydrostatic bearings on the guideways 35, 36, and the headstock cannot be displaced along the guideways when certain pockets of the bearings are connected to a discharge line. The nut 143, Fig. 4, is associated with a pre-biased nut 144 so as to eliminate play. Clamping devices 37, 38, 39 are associated with the respective hand wheels 20, 21, 22. The components 11, 12 are identical and, in addition to the screw 28, have piston-and-cylinders devices 40, 41 for effecting movements of the headstocks when the nuts 143 are uncoupled from the headstocks. The supply to the respective piston- and-cylinder device is controlled by a valve 47 which, in turn, is controlled by a displacement path transmitter 142 responsive to the movement of the nut 143 when it is uncoupled from the headstock. The spindle 18 of the headstock component 12 is radially supported by bearings 63, 64 and is associated with ring-shaped pistons 51, 52 in chambers 55, 56. Chamber 56 has a larger crosssection than that of chamber 55, which is in constant communication with a pressure line 57, and chamber 56 is connected by a valve 59 to a discharge line 60 or the pressure line 57 to effect axial movement of the spindle, the valve being controlled by a displacement path transmitter 145. The chambers 55, 56 are also connected by throttles 61  to hydrostatic axial bearings 62 for the spindle. The spindle can be fixed in a predetermined angular position by engagement of the rod 68 of an hydraulically operated piston with a groove in the spindle, a check-valve 75 connected to a feeler preventing the application of full pressure until the rod has engaged the groove. The spindle has a chuck 78 having a spring-loaded first piston 81 and a second piston 82 movable against the spring pressure upon actuation of a valve 80 to move the piston 81 against the spring to release the gear. The spindle is rotated by a drive 77 from a motor 76. The spindle of headstock 17 of component 11  is connected by gearing 93, Fig. 7, to a motor 94 and either of motors 76, 94 may act as a pump so that one spindle is driven as the other is braked during lapping of gears 91, 92. The motor 76 has its output controlled so as to act either as a pump or a motor by movement of a lever 97 connected to a piston moved to the right or the left in a cylinder 100 upon operation of a valve 103. The motors 76, 94 are inter-connected by conduits 105, 106 and when the motor 76 is acting as a pump it is driven by an electric motor 96. By using motor 76 as a motor or a pump, both flanks of the teeth of the gears 91, 92 can be lapped without reversing the direction of motor 96. The lapping pressure is determined manually by adjustment of a throttle 107 controlled by a hand lever 110 movable against a piston 112 in order that the operator can sense the lapping pressure, or automatically, when a control valve 113 is operated by pressure limiting valves 116, 117. Each of the hydrostatic bearings for the spindles 18 have a plurality of pockets supplied through respective channels of different capacity to avoid resonance oscillations.