SU988476A1 - Method of cutting chevron toothed gears - Google Patents

Description

The invention relates to mechanical engineering, in particular to the manufacture of chevron gears.

The chevron wheel consists of two helical cylindrical wheels, usually made integrally with a hub or shaft. Each wheel is called a half chevron. The direction of inclination of the teeth on the half-chevrons is in opposite directions. Structurally, chevron wheels are divided into solid and with a groove (spaced) to exit the tool. ''

Chevron wheels are manufactured on conventional and special gear-cutting equipment.

A known method of cutting spaced 15 ¹ cylindrical chevron gears by bending around with worm cutters on conventional gear hobbing · machines [1].

The disadvantages of this process relates' its low productivity due neob- ₂₀ go 2 units for each cutting polushevrona.

The purpose of the invention is the expansion of technological capabilities and increased productivity.

This goal is achieved by the fact that according to the proposed method, the processing of chevron wheels, both cylindrical and bevel, is performed with a milling cutter, which is performed with a double-sided spiral cutting of opposite directions at each end, and the gear to be machined is set so that its outer generatrix is parallel to the ends cutters.

In FIG. 1 shows a diagram of the cutting of cylindrical chevron wheels by a circular spiral mill; in FIG. 2 is a view A in FIG. 1 (another projection of the same circuit); in FIG. 3 - diagram of the cutting of conical chevron wheels ... ·

Disk spiral mill 1 (Fig. 1 and 3) - two-sided, with the left and right direction of the teeth with the same other parameters. If one of the chevron wheels 2 and 3, for example 2, is cut with a spiral gear, of a disk cutter 1, having the right direction, then the first chevron wheel should be cut with a spiral tooth 4 of the left direction of the same cutter 1 (Fig. 2). The main surfaces of the teeth of the wheels are mated, since 988476 are formed by the same producing surface. When each chevron wheel is cut, the dividing chain of the machine is adjusted to a gear ratio equal to the ratio of the number of teeth of the cut ₅ wheel to the number of strokes of the disk spiral mill.

Sliced by a spiral disk mill. cylindrical wheels 2 and 3 (Fig. 1) are assembled in a cylindrical chevron gear with parallel axes, bevel wheels 5 and 6 (Fig. 3) are assembled in a bevel chevron gear with intersecting axes.

Cylindrical and conical chevron gears made up of wheels cut by the method of bending around a spiral helical cutter ¹⁵ have a convex-concave contact in two sections: in the section normal to the tooth line and in the section formed by the initial cylinder and the initial wheel cone. Therefore, the chevron transmission, ₂₀ wheels of which are cut by the proposed method, has an increased load capacity for contact stresses.

Due to the fact that with herringbone gear wheels manufactured proposed sposobtsm convex tooth profile of concentration ²⁵ clocks with a concave shape (at tooth length), then such transmissions have a reduced sensitivity to non-parallelism (spur gear) and nonintersection (bevel gear ) axles of rotation of the wheels.

The proposed method of cutting spaced chevron gears provides higher manufacturing productivity on conventional gear-milling equipment, increased tooth strength in contact stresses and reduced requirements for gear assembly.

Claims (1)

ruled by the same production surface. When cutting each chevron wheel, the dividing chain of the machine is adjusted to a gear ratio equal to the ratio of the number of teeth of the wheel to be cut to the number of entries of the spiral disk cutter. The spiral-cutter cutter, cylindrical wheels 2 and 3 (Fig. 1) are assembled into a cylindrical chevron gear with parallel axes, and bevel wheels 5 and 6 (Fig. 3) are assembled into a conical chevron gear with intersecting axes. Cylindrical and conical chevron gears made up of wheels cut by rounding with a disk spiral cutter have a convex-concave contact in two sections: in section, the normal line of the tooth, and in section, formed by the initial cylinder and the initial cone of the wheels. Consequently, the chevron gear, the wheels of which are cut by the proposed method, has an increased load capacity for contact voltages. In connection with the fact that in chevron gears with wheels made by the proposed method, the convex profile of the tooth contacts the concave profile (along the length of the tooth). ), such gears have a reduced sensitivity to non-parallelism (cylindrical gear) and to non-intersection (bevel gear) axes of rotation of the wheels. The proposed method of cutting separated chevron gears provides higher manufacturing performance on conventional gear milling equipment, increased tooth strength with respect to contact voltages and reduced requirements for gear assembly. Claim method of cutting chevron gear wheels by the bending method, characterized in that, in order to expand technological capabilities and increase productivity, the processing is performed by a cutter, which is performed on a disk with double-sided spiral cutting of opposite directions at each end, and the gear to be machined is installed in this way so that its external formation is parallel to the ends of the cutter. Sources of information taken into account in the examination 1. Production of gears. Handbook ed. B. A. Taitsa, M., “Mechanical Engineering, 1975, p. 97. J /