A method and apparatus for carrying out contact measurement on at least one tooth flank of a gearwheel workpiece including the steps of: predetermining or defining a maximum region relating to the tooth flank, predetermining or defining a critical region relating to the tooth flank that overlaps the maximum region at least in part, executing relative movements of a probe of a measuring apparatus to guide the probe along the tooth flank to obtain actual measured values with a first resolution for a plurality of locations on the tooth flank within the maximum region, and obtain actual measured values with a second resolution for a plurality of locations on the tooth flank within the critical region, wherein the second resolution is higher than the first resolution.

A variety of magnetic field sensor arrangements provide so-called “tooth detectors” using a simple low-cost magnet.

A method for extracting a gear tooth profile edge based on an engagement-pixel image edge tracking method includes defining a transmission ratio relationship between a cutter and an envelope tooth profile, setting a cutter profile step size and an envelope step size, acquiring instantaneous contact images at different engaging times, and performing a binarization processing on each curve envelope cluster image; sweeping a boundary of an envelope curve cluster, acquiring pixel points of the edge; preliminarily tracking a tooth profile edge, and then performing a secondary extraction and compensation on the pixel points; calibrating coordinates of a cutter profile; extracting a pixel coordinate of an instantaneous engaging point; converting the pixel points among different instantaneous engaging images; extracting a final tooth profile coordinate of the gear, and performing a tooth shape error analysis and a contact line error analysis.

Provided is a movement distance measurement apparatus for confirming the operating state of a power transmission device for automobiles, which has removed the effect of temperature, and the movement distance measurement apparatus for confirming the operating state of a power transmission device for automobiles, which has removed the effect of temperature, is configured to measure the movement distance T of the detection target object 20 using a resonance circuit including the sensing coil by using changes in the resonance frequency of the resonance circuit and changes in the output voltage of the resonance circuit according to changes in the distance between the detection target object 20 and the sensing coil, and to be provided with a diode voltage detection unit that separately detects diode voltage included in the output value of the resonance circuit not to be affected by temperature change by removing the diode voltage.

A backlash measuring method is provided for measuring backlash at a plurality of different times. The backlash measuring method includes: a rotation amount calculating step of braking a ring gear relative to a second portion while contact between a target tooth and the ring gear achieved in a contacting step is maintained, causing a target pinion to rotate toward a second side in a rotation direction opposite to the first side with a driving force less than a braking force applied to brake the ring gear relative to the second portion until the target tooth touches the ring gear at a tooth surface facing the second side, and calculating an amount of rotation of the target pinion; and a measuring step of measuring backlash between the ring gear and the target pinion based on the amount of rotation of the target pinion calculated in the rotation amount calculating step.

A method for extracting a gear tooth profile edge based on an engagement-pixel image edge tracking method includes defining a transmission ratio relationship between a cutter and an envelope tooth profile, setting a cutter profile step size and an envelope step size, acquiring instantaneous contact images at different engaging times, and performing a binarization processing on each curve envelope cluster image; sweeping a boundary of an envelope curve cluster, acquiring pixel points of the edge; preliminarily tracking a tooth profile edge, and then performing a secondary extraction and compensation on the pixel points; calibrating coordinates of a cutter profile; extracting a pixel coordinate of an instantaneous engaging point; converting the pixel points among different instantaneous engaging images; extracting a final tooth profile coordinate of the gear, and performing a tooth shape error analysis and a contact line error analysis.

A magnetic field sensor for sensing motion of a ferromagnetic object comprises a substrate. The substrate includes first and second major surfaces, each having a width dimension and a length dimension. The magnetic field sensor further comprises a magnet. The magnet includes a first major surface proximate to the substrate, the first major surface of the magnet heaving a width and a length, and a second major surface. The magnetic field sensor further includes first and second magnetic field sensing dements. The first magnetic field sensing element and the second magnetic field sensing element are positioned beyond respective ends of the width of the magnet. The second magnetic field sensing element is substantially farther from the ferromagnetic object than the first magnetic field sensing element. A line passing through the first and second magnetic field sensing elements is perpendicular to the magnet axis.

A method and apparatus for carrying out contact measurement on at least one tooth flank of a gearwheel workpiece including the steps of: predetermining or defining a maximum region relating to the tooth flank, predetermining or defining a critical region relating to the tooth flank that overlaps the maximum region at least in part, executing relative movements of a probe of a measuring apparatus to guide the probe along the tooth flank to obtain actual measured values with a first resolution for a plurality of locations on the tooth flank within the maximum region, and obtain actual measured values with a second resolution for a plurality of locations on the tooth flank within the critical region, wherein the second resolution is higher than the first resolution.

A variety of magnetic field sensor arrangements provide so-called tooth detectors using a simple low-cost magnet.

A differential assembly for a powertrain of a vehicle includes a differential housing, a differential shaft, and a retainer ring. The differential shaft retains a pair of opposing bevel gears within the differential housing in mesh with a pair of opposing side gears each connected to a half shaft. The retainer ring is disposed on the outside of the differential housing covering the bores in which is fit the differential shaft.