SU1509570A1 - Cylindrical gearing - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in power and kinematic gears. The aim of the invention is to increase the carrying capacity by eliminating the sharpening of the teeth at the ends of the wheels. The cylindrical gear transmission has identical tooth profiles in sections parallel to the front, the main and division circles of the gear are aligned. A wheel coupled with a gear wheel has a main circumference much smaller than the circumference of the lower active points. The radii of the circles along the length of the tooth, passing through the upper and lower active points of the profile, are equal, but different for the concave and convex sides. 5 il.

Description

The invention relates to mechanical engineering and can be used in power and kinematic gears.

The purpose of the invention is to increase the carrying capacity by eliminating the sharpening of the teeth at the ends of the wheels.

FIG. 1 shows the teeth of the drive wheel, the cut; in fig. 2 - the tooth of the mating wheel; in fig. 3 - wheel teeth in conjunction with the tool; in fig. 4 shows an interconnection diagram of the thickness of the cutting part of the tool with the tooth cavity at the base; Fig. 5 is a cross section of the teeth of the wheel at the base.

The drive wheel 1 has teeth, the depressions of which are outlined along the length by arcs of radii PV from the concave side of the tooth and R, from the convex side of the tooth, and the pitch of the teeth is the same as

in the middle and in the face planes,

The mating wheel 2 has teeth, the depressions of which are outlined along the length by arcs of radii R from the concave side and R from the convex side, which ensures accurate coupling of the teeth of the wheels.

When forming a tooth of a profiling wheel, a tool point K with a (width a c ,, symmetric cutting part located at radius R, from the axis of rotation of the tool, moves at an angle dp of cutting, for example, the arrow A, arrow B, resulting in the left side of the tooth profile (Fig. 3): the upper active points along the profile apexes are located on the radius R, the lower active points are located on the radius Rpa.

To design the right side of the tooth, the profiling point K, located on the radius R from the axis of rotation of the tool, moves under the cutting edge along arrow A while simultaneously rotating the wheel along arrow B. At the same time, no tool shift is required.

The radius Hz of the main circumference for the wheel is chosen smaller than the radius Rp of the lower active points of the profile.

The relationship of the thickness A of the cutting part of the tool with the involute tooth profile at the base (Fig. 4) is described by the relation

cos

ITm- Rfj

 k7

 "

Mr. S

h

h

- the radius of the transition curve 20 teeth is determined by the formula

thirty

1, f m R „X -“ - I - 5 DfJ

R.

pf.

3.1415;

The linkage symbol} R о, -. M (1,8, ..., 2,2) is the radius of the circle of the centers of the transition curve, mm;

R t - the radius of the pitch circle

nosti, mm; „P - tol1f1na tooth legs, mm;

 f

SOP tooth thickness at the lower points of the involute profile

tooth mm

In transmission operation, the teeth of the wheels 1 and 2 transfer the load and interact with each other by convex-concave side surfaces of the teeth.

Claims (1)

Invention Formula A cylindrical gear train containing wheels with teeth that are circular in length and with the same involute tooth profile in sections, pa, is parallel to the frontal one, and the main and division circles of one of the wheels are aligned with each other, characterized in that abilities, the main circumference of the other wheel is less than the circumference of the lower active points, the radii of curvature along the length of the mating teeth, passing through the upper and lower profile points, are equal to each other and different for the concave and convex sides of the tooth . Phie. h Fig.Z FI.5