SU1460481A2 - Slider-crank mechanism - Google Patents

Abstract

The invention relates to crank-slider transducers of rotational motion into oscillatory motion and can be used in particular in drives of active organs of agricultural machines. The purpose of the invention is to increase the reliability of the mechanism by improving lubrication conditions. When the shaft 2 is rotated and the oblique sleeve 3 fixed on it between the conical surface 7 of the oblique sleeve 3 and the unloaded surface of the cylindrical hole in the oblique washer 4, a gap is formed in which grease accumulates, constantly wetting the surface of the oblique sleeve 3. A cylindrical surface 8 in the middle part of the oblique bushing 3, a greater hydrostatic pressure is created in the gap, which also improves the lubrication conditions. 2 Il. (L C5: about 4:00 INJ

Description

The invention relates to mechanical engineering, in particular to crank-sliders converters of rotational motion into oscillatory, can be used, in particular, in drives of the active organs of agricultural machines and is an improvement of the invention according to the author. St. No. 1145188.

The purpose of the invention is to increase the reliability of the mechanism by improving the lubrication conditions of the oblique bushing due to the formation of a gap between its outer surface and the surface of the hole in the oscillating washer.

FIG. 1 shows the structure of the proposed mechanism; in fig. 2 is a diagram of the interaction of the surfaces of an oblique bushing and swinging washer.

The mechanism includes a housing 1, a crank shaft 2 installed in it with an oblique bushing 3, a swinging washer 4 in the shape of a cube or parallelepiped, mounted in the housing 1 with the possibility of rotation of a driven link 5 with a through groove in it, in which is installed a hinged washer 4 and rubber-metal spacers 6 installed between the working faces of the washers 4 and the surfaces of the groove in the driven link 5. The braid sleeve 3 is made in the form of two identical truncated cones 7, facing each other with large bases and matching cilin core 8. The geometrical parameters of the cones and cylinder are determined experimentally and are related to each other by

L .31tgo,

-the length of the cylindrical part of the oblique sleeve 3;

- length of the truncated cone 7;

truncated cone angle 7.

1460481

The mechanism works as follows.

When the crank shaft 2 rotates, the braid bushing 3, rotating in the opening of the oscillating ring 4, informs it of a complex motion consisting of two oscillatory motions — around the axes of the op-amp and oz. One of these movements, namely oscillations about the axis OZ, is transmitted to slave link 5. The oscillations around the OS axis are not perceived by the follower link 5, since the swinging washer 4, when oscillating around this axis, freely moves into the groove of the driven link 5.

 During operation, a wedge-shaped gap is formed between the surfaces of the cones 7 and the unloaded portions of the surface of the cylindrical hole in washer 4, in which grease accumulates, constantly wetting the rubbing surface of the oblique sleeve 3. The presence of a cylindrical drain 8 contributes to the creation of increased hydrostatic pressure clearance, which also improves lubrication conditions.

Claims (1)

Invention Formula Crank-slider mechanism for ed. St. No. 1145188, characterized in that, in order to increase reliability, the braid bushing is made in the form of two identical truncated cones facing each other. large bases, and a cylinder located between it, the length L of which is chosen from  L 31tg with, - truncated cone length. Where 0 / one arctg- is the angle of the truncated cone. Phie, 1