Crown Gear B.v.

Augustinus F Basstein

Gustaaf A Uittenbogaart

Anne Lourens Sijtstra

Gear transmission between an input shaft and an output shaft, comprising a first and second face gear which are rotatable about a first axis of rotation and have identical toothing as regards number of teeth and module, which face gears are mounted at an adjustable distance from each other with the toothing facing each other and with an essentially fixed rotation position relative to each other, comprising a first cylindrical pinion with an axis of rotation at right angles to the first axis of rotation, which first pinion with a first tooth clearance is in mesh with the first face gear, and comprising a second cylindrical pinion whose axis of rotation is parallel to the axis of rotation of the first cylindrical pinion, which second pinion with a second tooth clearance is in mesh with the second face gear while the input or the output shaft is connected to the first pinion. The toothings of the face gears and the pinions in mesh therewith are designed in such a way that after theoretically correct setting of the toothings the first tooth clearance is greater than the second tooth clearance.

Gear transmission

A hob cutter (4) for machining face or crown gears comprises a disc-like cutter body having an axis of rotation (6) and a number of hob teeth groups (1, 2, 3, . . . ) which are uniformly distributed over the circumference and which are each bounded at the front by a cutting face (S) and at the cirumferential side by a clearance face (V). The cutting face and the clearance face of each hob teeth group intersect one another in a cutting edge (9) which determines the shape of the face gear to be machined. The clearance face of each hob teeth group is made up of a number of generatrices (L, m) which are each situated in a machining plane which is determined by a line which intersects or crosses the axis of rotation (6) perpendicularly and intersects the generatrix at the position of the cutting edge. The extensions of the generatrices (L, m) determining the clearance face run at a minium spacing over the outside of the downstream hob teeth group.

Hob cutter for machining face gears, and method for manufacturing such a

In a face gear transmission with a cylindrical pinion and a face gear meshing therewith the toothing of the face gear is derived from a theoretical profile (22) of a pinion with an infinitely small thickness by moving the centre of this pinion along an imaginary axis which the coincides with the axis of rotation of the cylindrical pinion. The teeth of the face gear are crowned so as to achieve the required tooth clearance. The shape of the teeth of the face gear is such that upon the movement of the theoretical pinion profile (22) in the direction of the imaginary axis of rotation, starting from a defined diameter between the maximum and the minimum diameter of the toothing of the face gear, the centre of the theoretical pinion profile undergoes a displacement (P.sub.1, P.sub.2) at the same time at right angles to the imaginary axis of rotation in the direction towards the toothing of the face gear.

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Prinsenbeek, Netherlands

Augustinus F Basstein