SU1252585A1 - Gearing - Google Patents

Description

The invention relates to mechanical engineering, in particular to gears with variable wheel diameter.

The aim of the invention is to expand the kinematic transmission capabilities by changing the diameter and pitch of the teeth of the engaging wheels, as well as higher accuracy by compensating for axial skewness.

On Lig.1, a gear is shown; figure 2 is the same, side view; in FIG. 3 - section A-A in FIG. 2; cha figa - billet gear.

A gear transmission contains engaging gears 1 and 2, at least one of which is made in the form of a hub 3, two discs A and 5 with radial front grooves attached to the hub 3 with the possibility of displacements in the circumferential direction and fixation relative to the hub 3 using screws 6, placed in the annular grooves 7 disks. Along the periphery of the hub 3, elastic wire is laid out in a zigzag manner, forming a toothed rim 8 (FIG. D). The wire is fixed in the radial grooves of the discs 4 and 5 facing the ends of the hub 3. The crown 8 has 9 radial sections and 10 teeth-sections (Fig. 4), having an arched design. When mounted in the hub 3, the teeth 10 protrude above its surface to a height H (FIG. 2) equal to H 2.25 m, where m is the modulus for adhesion.

525852

Tooth 10 can be described in

axial section with radius R) / 2 D

D is the diameter of the pitch circle.

In this case, the gear is less sensitive to axial distortions.

The device works as follows.

If it is necessary to change the diameter of 10 meters of the wheels 1 and 2, loosen the screws 6 for fastening the disks 4 and 5 to the hub 3 and move the radial 9 sections of the crown 8 in the radial grooves of the disks 4 and 5. The diameter and pitch 5 of the teeth of the crown 8 change , for example, from DH to D) u and from t to t, respectively (Fig. 3).

Exact size D can be obtained

on the reference wheel. Next, the screws 6 tighten, thus fixing the crown 8 relative to the hub 3. Since the disks 4 and 5 have the ability to rotate relative to the hub 3 within the annular grooves 7, if necessary, you can change the inclination of the teeth of the crown 8. The crown 8 can be obtained from a calibrated section in the form of a tooth wire from spring steel, followed by fine-tuning (grinding) the teeth assembled with the hub 3.

When the transmission is in operation, the moment is transmitted with the help of the engaging wheels 1 and 2. In this case, the elastic arched teeth smooth out mounting inaccuracies, dynamic loads in the transmission.

FIG. 2

FIG. d

FIG. It

Compiled by V.Sergeev Editor L.Shandor Tehred O.Gortvay Corrector V.Sinitska

Order D609 / 39 Circulation 880 Subscription

 USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, And

Claims (2)

1. A gear transmission, containing engaging gears, at least one of which is made in the form of a hub, two disks having radial grooves on one of the ends and attached to the hub from the side of its ends with the possibility of displacement and fixation relative to the latter, and a gear rim, the teeth of which are formed by a portion of elastic wire laid in a zigzag fashion on the periphery of the hub and fixed in the grooves of the discs, characterized by the fact that with the aim of expanding the kinematic possibilities by changing the diameter and pitch ubev crown ends discs with radial grooves face the ends of the hub. 2. The gear transmission according to claim 1, characterized in that, in order to improve accuracy by compensating for skew axles, sections of the wire in the axial section of the wheel are described by a radius of ° i / ^? where is the diameter of the pitch circle of the wheel. Whig I