SU1747774A1 - Belt transmission - Google Patents

Abstract

Usage: in mechanical engineering as an element of the drives of machines, construction, transport, agricultural, etc. Machines .. The essence of the invention: the cross-sectional profile of the remix transmission is described by three arcs of the same radius, and the centers of these arcs are located at the vertices of an equilateral triangle. The profile of the screw grooves has the shape of a wedge, the sides of which also have the shape of arcs with a radius corresponding to the radius of the arcs of the belt. 2 Il.

Description

The invention relates to mechanical engineering and can be used in machine tools, construction, transport and agricultural machines and mechanisms for transmitting torque between shafts.

A known belt drive comprising leading and driven shields covered by a rectangular belt, the profile of the brooks of which is similar to that of the belt cross section.

A disadvantage of the known gear is low durability and low. Efficiency due to large friction on the side walls of the pulley streams and increased hysteresis losses in the belt ..

A belt drive is also known, comprising a drive and bumper wheels covered by a round twisted belt, the profile of the brooks of which is similar to the profile of the belt cross-section.

The disadvantage of this transmission lies in its low loading capacity due to the high specific pressures in the zone of contact of the belt with the pulleys .;

The closest in technical essence to the proposed technical solution is a belt drive containing driving and driven pulleys covered by a V-belt, the profile of the streams of which is similar to the profile of the transverse belt.

A disadvantage of the known transmission lies in the small surface of the zone of contact of the belt with the pulleys, which also reduces the load capacity of the transmission.

The purpose of the invention is to increase the load capacity by increasing the working surface of the belt.

The goal is achieved by the fact that the cross section profile of the belt is described by three arcs of the same radius, the centers of which are located at the vertices of an equilateral triangle with sides equal to the radius of the arcs.

Figure 1 presents the proposed belt transmission overall view; figure 2 - section aa in figure 1.

with/

WITH

s |

d XI - h 1

The belt drive contains a wedge-shaped belt 1 leading 2 and driven 3 pulleys, the profile of the streams of which is similar to the profile of the belt cross-section.

The cross-sectional profile of the belt is described by three arcs, vx and sb of the same radius R, the centers of which are located at the vertices of the avs-sided triangle (shown in Fig. 2) with sides equal to the arc radius. In cross section, the belt 2/3 of its perimeter contacts pulleys along two arcs aqv and abs, and its width B is equal to height N.

Such a cross-sectional shape allows, with the same width B and height H of the belt, to increase the length of the contact lines agw and abs, and hence the working surface of the belt.

The belt drive is fitted with a tensioning device 4,

The program works as follows.

Using the tension device 4 pro. the belt preload 1 is water tensioned, - as a result of which it is pressed by force P to the pulleys, and forces Pi appear on the surface of the streams, which determine the specific pressure in the zone of contact of the belt with the pulley.

When the driving pulley 2 rotates, it causes friction by dragging the belt 1 into motion, which causes the pulley 3 to rotate and transfer power between the pulleys, the magnitude of which, other conditions being equal, is determined by the value of the permissible specific pressure in the contact zone of the belt with the pulleys .

Since in the proposed transmission the belt has a larger working surface in comparison with the prototype, when

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with the same specific pressure in the zone of its contact with the pulleys, the transmission permits operation with a large initial tension, which increases the load capacity of the transfer, i.e., increases the power transmitted by the transfer.

The increase in load capacity is also facilitated by the convex shape of all faces of the belt, leading to an increase in the area

10 a cross section, as well as a decrease in the ratio of the width of the belt to its height.

In addition, in the transmission belt, when bending on the pulleys, the tensile stress of bending decreases as it decreases

15 distance 11 ni H1 from the center of the plate O of the section to the most loaded sections in zone K, which increases the durability of the belts.

The shape of the belt of the proposed transmission allows for the manufacture of a twist,

20 carried out in a known manner, in which the belt in the relaxed position has the appearance of a distorted figure of eight and provides an additional increase in the durability of the belt due to participation in

25 rubbing its entire surface.

Claims (1)

The proposed transmission can be performed with both flat and spatial arrangement of the pulley axes, since the transmission belt has three axes of symmetry 30, instead of one as in the prototype. Claims of the invention: A belt drive containing the driving and driven pulleys covered by the V-belt, the profile of the streams of which 35 is similar to the cross-sectional profile of the belt, characterized in that in order to increase the load capacity by increasing the working surface of the belt, the cross-sectional profile of the belt is described by three arcs of the same radius, the centers of which are located at the vertices of an equilateral triangle with sides equal to the arc radius FIG. Aa Fig 2. For awards