RU1787713C - Device for gear-shaving machine - Google Patents

Abstract

Usage: a device for producing a barrel-shaped tooth of gears (ZC) during shewing. The device has a housing with an opening along the axis in which a two-arm roller is swinging on a fixed spherical support. Through the balls located in the openings of the housing, the oscillating movement of the two-shoulder roller is transmitted by the SC. To provide for the swing of the SC on the device between the mandrel and the opening of the SC, a gap is provided, which is determined depending on the size of the barrel. 3 ill.

Description

The invention relates to mechanical engineering and may find application in the processing of gears in a tooth shaving operation.

A device is known for producing a barrel-shaped profile in longitudinal section of a tooth profile of a wheel. A disadvantage of such a device is that the modification of the tooth profile along the width of the crown is ensured by the swinging of the machine table, which cannot provide the required processing accuracy.

The aim of the invention is to expand technological capabilities by shaving the wheels with longitudinal tooth modification by swinging the machined wheel in a plane passing through the axis of the center mandrel perpendicular to the axis of the shaver.

This goal is achieved by the fact that the device is equipped with a swing mechanism, swing support and two spherical bearings located respectively on the ends of the sleeve and the housing, while the support

the swing is installed in an axial hole made in the housing, and contains a spherical thrust bearing and two bushings interconnected by means of a screw, the spherical ends of which interact with the thrust bearing, moreover, in the housing there are two rows of radial holes equally spaced relative to the thrust bearing, which are balls designed to interact with the outer surface of the bushings and the hole of the machined wheel, and the swing mechanism consists of a bracket designed to be placed below the center line ov on the stationary part of the machine, and two spring-loaded stops located symmetrically relative to the thrust bearing, designed to interact with the ends of the machined wheel.

In FIG. Figure 1 shows the design of a sheving mandrel. The mandrel consists of a housing 1, bushings 2 and 10, a roller 3, a sphere 4, balls 6, spherical bearings 5 and 15, a gear 9, restrictive pins 7, screws 8, nuts 11, a clamping sleeve 12, the housing

ate

WITH

xj

00 XI

Xi

Cj

spring mechanism 14, balls 15, axles 16, wheels 17 and springs 18.

The device operates as follows. The gear 9 is worn on the landing diameter of the mandrel 1. The landing hole of the gear 9 interacts with the surface of the swinging bushings 2 through the balls 6. After installing the gear 9 on the mandrel 1, the clamping sleeve 12 with a spherical support 1 is put on. The mandrel assembly with gear 9 and clamping sleeve 12 is mounted on the center supports on the table of the shaving machine. In this case, the spring mechanism housing is fixed on the stationary part of the machine. 14, which allows the gear 9 to swing during shewing,

Fig. 2 shows a barrel-shaped tooth; Fig. 3 is a case of obtaining a saddle-shaped tooth.

The processing of gear 9 is carried out in the following sequence. Initially, the gear wheel 9 is mounted on the mandrel 1. In this case, landing is carried out at the points of contact of the balls 6 with the billet hole in two planes passing through the axis of the balls perpendicular to the axis of the roller 3. A sleeve 12 is mounted on the mandrel 1. On the housing 1 and the sleeve 12 has spherical bearings 5 and 13, which are maintained in free condition with the help of pins 7. When the gear 9 is mounted on the mandrel 1, the ends of the wheel contact the planes of the spherical supports 5 and 13. The gear 9 is assembled and on the mandrel of the sheving unit It is pressed in the centers on the table of the shaving machine.

If it is necessary to process a gear with a barrel-shaped tooth, a spring mechanism attached to the stationary part of the machine is brought to the ends of the wheel, as shown in Fig. 1. The spring mechanism consists of a housing 14, two spheres 15, two axles 16, two rings 17 and two springs 18. Using a spring mechanism, the gear 9 is pumped together with the assembly roller consisting of bushes 2 and 10, roller 3, balls 6 and nuts 11. The swinging is carried out relative to the axis O with the radius of the spherical surfaces marked A. In this case, a clearance D is calculated between the bore hole of the workpiece and the outside diameter of the mandrel 1, calculated depending on the value of the specified barrel-shaped ™ (saddle-shaped sti) teeth.

When shewing a gear on a mandrel with a spring mechanism installed, the gear swings in the next direction. When the machine table moves in the direction of arrow A, the gear rotates around the axis O in the direction of arrow G. When the machine table moves in the direction of arrow B, the gear wheel rotates around the axis O in the direction of arrow B. The rotation of the gear wheel in the direction of arrows B and D is ensured by pressure gear of the spring mechanism.

In this case, the smallest metal layer is removed from the surface of the teeth in the end plane of the ring gear passing through point O.

The rotation pattern of the gear depending on the direction of the cutting forces P and the direction of the pressure forces O of the springs are shown in Figs. 2 a, b and c. Figure 2 g shows the profile of the barrel-shaped tooth obtained by such shewing.

When shewing according to the scheme shown in Fig. 2, the torque from the force Q relative to the axis O must be greater than the torque created by the cutting force P and friction in the supports.

When shewing a gear without a spring mechanism, the swing of the gear occurs in the following direction. When the machine table moves in the direction of arrow A, the gear rotates around axis O along arrow B,

When the machine table moves in the direction of arrow B, the gear rotates around the axis O along arrow G. At the same time, the largest metal layer is removed from the teeth surface in the end plane of the gear ring passing through point O from the surface of the teeth. The rotation pattern of the gear depending on the direction of the cutting forces is shown in Figs. 3a and 3b. On figs g shows the profile of a saddle-shaped tooth obtained by such shaving.

The adjustment of the device is carried out depending on the preset tooth keg, i.e. from the magnitude of the longitudinal modification. If the barrel-shaped value is set to Dboc, then the gap between the bore diameter of the gear wheel hole 9 and the bore diameter of the mandrel 1 is set to Dz, calculated by the formula:

Dz

As

04

AT

where L is the width of the wheel hub;

In - the width of the ring gear.

The use of the proposed shaving mandrel will allow shewing of profiles of variable thickness

the width of the tooth and receive either barrel-shaped or saddle-shaped gear teeth. As you know, a barrel-shaped tooth profile improves the quality of the gear. And this will lead to a significant economic effect.

Claims (1)

SUMMARY OF THE INVENTION A device for a gear shaving machine comprising a center mandrel and a housing with a sleeve mounted thereon for clamping to the end face of the machined wheel, characterized in that, in order to expand technological capabilities by shaving the wheels with longitudinal modification of the teeth by swinging the machined wheel in a plane passing through the axis of the center mandrel perpendicular to the axis of the shaver, the device is equipped with a swing mechanism, swing support and two spherical supports, respectively at the ends of the sleeve and the housing, while the swing bearing is installed in an axial hole made in the housing and contains a spherical thrust bearing and two bushings connected to each other by means of a screw, the spherical ends of which interact with the thaw, and two rows are made in the housing radial holes equally spaced relative to the thrust bearing, in which balls are arranged for interacting with the outer surface of the bushings and the hole of the machined wheel, and the swing mechanism consists of an arm designed to be placed below the center line on the fixed part of the machine, and two spring-loaded stops arranged symmetrically with respect to the bearing, designed to interact with the ends of the machined wheel.