SU1733777A1 - Gearing - Google Patents

Abstract

The invention relates to mechanical engineering. The purpose of the invention is to increase the reliability of transmission. Gear 1 transmission made with radial slits between the teeth. Each of the slots consists of a narrow 2 and a wide 3 parts, described by mathematical dependencies, taking into account the geometric relationships of the gear ring and the properties of the material from which it is made. 1 il.

Description

The invention relates to mechanical engineering.

Gears are known in which the wheels are made with notches along the ends of the teeth, transmissions with hollow teeth, which are characterized by high compliance at the moment the teeth come into contact with each other.

The disadvantage of these transmissions is the low carrying capacity as compared to transmission standards.

The gear is the closest to the proposed one, containing gears, in one of which in the hollows between the teeth there are recesses in the form of slots with a depth equal to (2-3) tons and width (0.1-0.2) tons, filled with an elastic material; radial holes are made in the slots to increase the reliability of the transmission.

A disadvantage of the known transmission is the low reliability of the transmission due to the high dynamic load and the low damping capacity of the material in the slot.

The purpose of the invention is to increase the reliability of transmission by reducing the dynamic load.

The goal is achieved by the fact that one of the gear wheels in the gear train is made with radial slits consisting of two parts, one of which is cylindrical with a certain width and depth, and the other one is wider and deeper. Each part of the slot is made according to a certain geometric ratio.

The drawing shows the wheel structure, general view.

In a gear transmission in wheel 1 in the hollows between the teeth, there are radial slots consisting of two parts. Part 2 of the slot, adjacent to the cavity between the teeth, is made with a width Di of length li along an average radius R with an axis lying on a cylindrical surface passing through the middle of depth I. The other part 3 is made width hi and depth I.

(L

WITH

VI

CJ

co VI

VI

vi

The width, depth and radius of the slits are selected from the following relationships:

(l + y) 2 (215ti + 2l + 3h)

D 3 Hi E (H + l + h)

(rf2-Hi) sin | J-Hi;

22 R (1.5-2) m; h (0.5-1.0) m;

where a is the slot width of the first section;

hi is the slot width of the second segment;

R is the average radius of the slot of the first section;

And - the length of the slot of the first section;

t is the slot length of the second section;

h - wheel tooth height;

Z2 - the number of teeth of the wheel;

Hi is the minimum distance between adjacent slots;

rf2 - radius of wheel leg circumference;

sg - allowable stress of bending of the wheel material,

E is the modulus of elasticity of the wheel material.

Gear transmission works as follows.

When the tooth of the gear wheel 1 enters into engagement with the corresponding tooth of the second wheel, a blow occurs. The dynamic load in the gearing depends on the hardness of the tooth, which is initially determined by the length L of the tooth, and the deformation of the teeth. Since the length L is much greater than the height of a standard tooth, the dynamic load in the gear drops, the frequency of tooth oscillations and the frequency of tooth collisions fall. about a friend when matching. In the two-pair engagement zone, the gap A of part 2 of the slit is selected and the engagement stiffness increases sharply and its deformation decreases. However, when choosing the gap A, it is necessary to minimize contact voltages

Claims (1)

the surfaces forming part 2 of the slot. This requirement is met by the slot of part 2, which has cylindrical surfaces with radii of curvature, 5-2.0 m and a length of the bridge between the trench and part 3 of the slit H (0.5-1.0) m. The invention of a gear transmission comprising gears, in one of which radial slots are made in the cavities between the teeth, in order to improve the reliability of the transmission, the slots are made of two parts, the part adjacent to the cavity is cylindrical width A and depth And along the average radius R with the axis lying on the cylindrical surface passing through the middle of the depth And, the other part is made of width hi and depth I, and the width, depth and radius of the slits are chosen from the following ratios : BUT ou - (I + y) 2 (2.5h + 2l + 3h) 3 Hi Е (H + l + h) (rf2-l-h) sin -Hi; R (1.5-2) m; h- (0.5-1.0) m; where a is the slot width of the first section; hi is the slot width of the second segment; R is the average radius of the slot of the first section; And - the length of the slot of the first section; I - the length of the slot of the second section; h - wheel tooth height; Z2 - the number of teeth of the wheel; Hi is the minimum distance between adjacent slots; rf2 - radius of wheel leg circumference;  7U is the permissible bending stress of the wheel material; E is the modulus of elasticity of the wheel material.