GEAR TESTING MACHINE

1500093 Testing gears W HOFLER 27 Oct 1975 [20 Dec 1974] 44052/75 Heading G1M A machine for testing tooth flange obliquity of straight or helical spur gears is of the kind in which the gear 3 rotates coaxially with an exchangeable "cylinder" 5 the cylinder being engaged by a rule 6 on a reciprocably slideable member 7 and a feeder 12 being mounted for vertically sliding movement in a block 14 fixed to the frame to follow the tooth flank. It has a structure 9 slidable parallel to the member 7 and driven by the latter through arms 23, 24 fixed to a spindle 25 pivoted on the frame, the connection between one of these arms and the slide being variable to alter the drive ratio. The drive ratio remains always close to 1:1 and the arms 23, 24 pivot through only a small angle to either side of a plane through their pivotal axis parallel to the axis of rotation of the gear. As shown, the arm 23 has a slide-block connection 19, 21 with the structure 9 adjustable by a spindle 20. The structure 9 carries an angularly adjustable guideway 11 in which slides a block 15 on which is mounted to feeler 12. Spindles 16, 17 provide for positioning of the feeler which is also adjustable radially of the gear 3. The gear 3 and cylinder assembly is itself moveable on the frame as shown by arrows 4. The machine has the advantage that only a small range of cylinders 5 is required to cover a large number of gear sizes.