Abstract: A tester for backlash-free rolling of gears with a mating gear generally comprises a base, a stationary spindle on which a test gear can be mounted and which can be driven by a motor; an oscillating slide on which a rotary mounting device is located with an axis of rotation for loosely rotating the mating gear and which slide being guided for easy movement in the direction of the center distance of the two gears; first means for setting a specified test center distance between the two gears; second means providing a specifiable test force for a constant tight mesh of the two gears; and third means for measuring center distance variations during the rotation of two gears. To simplify and reduce design costs of such testers, the stationary part of a linear motor is disposed on the base and the moveable part thereof is disposed to the oscillating slide, and an associated separate CNC control is provided to allow the linear motor to be used for said three means.

Abstract: A tester for backlash-free rolling of gears with a mating gear (13) generally comprises a base (1), a stationary spindle (2) on which a test gear (3) can be mounted and which can be driven by a motor (5); an oscillating slide (7) on which a rotary mounting device is located with an axis of rotation (14) for loosely rotating the mating gear (13) and which slide being guided for easy movement in the direction of the center distance of the two gears; first means for setting a specified test center distance (20) between the two gears; second means providing a specifiable test force for a constant tight mesh of the two gears; and third means for measuring center distance variations during the rotation of two gears.

Abstract: An automatic test apparatus for testing circumferential spacing in gears, as well as a further development for testing deviations in tooth thickness, tooth gaps, and gear concentricity, are disclosed, in which with a single revolution of the gear the testing of circumferential spacing is accomplished for both the right and left flanks of the wheel. The values for the deviations in gear concentricity, tooth thickness and tooth gaps are preferably detected at the same time, thereby avoiding the possibility that the measuring feeler can undergo vibration-caused deviations with respect to the tooth flank to be approached for attaining a particular measuring position.

Abstract: In a gear probe for testing the shape and orientation of gear flanks, a control and computer unit is used to effect the necessary positioning between the gear flank to be tested and a measuring sensor. First the gear is positioned coarsely; during this step a transmission disc and a linear transmission track are out of engagement with one another. Thereafter, the measuring sensor is advanced into the tooth gap and a fine positioning for a zero balancing of a potentiometer of the measuring sensor is effected by automatically displacing the linear transmission track with respect to the carriage on which it is mounted or by automatically changing the relative angular position between the gear to be tested and the transmission track. All displacements of apparatus components for the coarse and fine positioning as well as for the performance of the measuring process proper are automatically effected by the program-controlled control and computer unit.

Abstract: An automatic testing apparatus is proposed for testing the circular spacing of gears and, in a further development, for simultaneously testing the deviations in gear concentricity, tooth thickness and tooth gap. The testing of circular spacing is accomplished in only one revolution simultaneously for both the right and left tooth flanks of the gear, and the measurement values thus obtained can be used as well for ascertaining the deviations in gear concentricity, tooth thickness and tooth gaps.

Abstract: A method for synchronizing the sensor movements of a pitch an/or concentricity measuring device for gears, wherein the sensor enters into gaps between teeth on the rotating gear, the measurement is made and then the sensor is retracted until the next gap has appeared in front of the sensor. The sensor movement is synchronized with the rotary movement of the gear by utilizing the output signals from the sensor to provide a measurement of the rate of rotation of the gear at the onset of the period when it is being carried along and, under consideration of the known gear parameters, using this measurement to automatically calculate the waiting period during which the sensor must be held in its retracted position before the next gap will arrive. An apparatus for determining the rate of rotation by measuring the time required for the sensor to traverse a given path length and to then control the sensor movement on the basis of the waiting period calculated from the determined rate of rotation is also disclosed.