SU1260611A1 - Three-dimensional link-lever mechanism - Google Patents

Description

The invention relates to mechanical engineering, namely to articulated motion transducers, and can be used, in particular, in automatic machines and in adjustable devices.

The purpose of the invention is to regulate the position in space of the axis of rotation of the slave link without stopping the mechanism, which expands its functional and kinematic capabilities as well as the range of application.

FIG. 1 schematically shows a two-crank mechanism; in fig. 2 - curvature-beam mechanism; in fig. 3 - crank-parallelogram mechanism.

The mechanism contains a base 1, crank 2, a driven link 3, a connecting rod 4 and a lead 5. The connecting rod 4 is connected to the crank 2 by the hinge 6 and the driven link by the hinge 7. The leash 5 is located at one end on the base 1 with the possibility of fixed rotation around the axis rotation of the crank 2, and the other end is connected by the hinge 8 to the driven link 3. The axes of the hinges 6, 7 and 8 intersect with the axis of rotation of the crank 2 at the common point O, which is the center of the mechanism, / 2L in the two-crank mechanism (Fig. 1) the links of the mechanism are interconnected by the following angular dependence:

a + 6 p + v, a) ab (p-7 /.

a, p, t b

- the central angle between the axis of rotation of the crank 2 and the axis of the hinge 6 connecting the crank 2 and the connecting rod 4;

0

five

0

p is the central angle between the pivots of the hinges 6 and 7 connecting the connecting rod 4 with the crank 2 and the link 3; Y is the central angle of the axles of the hinges 7 and 8, connecting link 3 with the connecting rod 4 and the leash 5; b is the central angle between the axis of rotation of the crankshaft 2 and the axis of the hinge 8 connecting the link 3 and the leash 5.

In the curvature-rocker mechanism (Fig. 2), the links of the mechanism are related by the angular dependence

a-f P. T + a, p,

6 90 °.

In the crank-parallelogram mechanism (Fig. 3), the link of the mechanism is connected by the angular dependence

, р b 90 °

The mechanism works as follows.

The rotation of the crank 2 through the connecting rod 4 is communicated to the driven link 3, which rotates around the axis of the hinge 8 (FIG. 1) in the same direction, but with excellent speed, in the embodiment of FIG. 2 is an oscillatory motion and in the embodiment of FIG. 3 - rotational motion in the same direction with equal speed.

To change the position in space of the axis of the hinge 8, the driver 5 is reported using, for example, a self-braking worm gear (not shown) to turn the required angle around the axis of rotation of the crank shaft 2. The turn is made without stopping the mechanism.

FI.2

Rig.Z

Claims (4)

1. SPATIAL HINGE-LEVER MECHANISM, comprising a base with a crank placed on it, a driven link and a connecting rod connected to the crank and to one end of the driven link by hinges, the axes of which are intersected with the axis of rotation of the crank at one point, characterized in that, for the purpose of adjusting the position of the axis of rotation of the driven link, the mechanism is equipped with a leash in the form of an arcuate rod, one end of which is placed on the base with the possibility of a fixed rotation around the axis of the crank, the other end is connected with the other end of the driven link by a hinge whose axis is intersected with the axis of the crank at the same point forming the center of the mechanism, and each of the central angles between the axis of the crank and the axes of all the hinges of the connecting rod and the driven link is less than or equal to 90 °. 2. The mechanism by π. 1, characterized in that the central angle between the axes of the crank and the hinge connecting the driven link with the leash is less than any central angle between the axes of the crank and the hinge connecting the crank with the connecting rod. 3. The mechanism by π. 1, characterized in that the central angle between the axes of the crank and the hinge connecting the driven link to the lead is 90 °, and the central angle between the axes of the hinges of the driven link is larger than the central angle between the axes of the crank and the hinge connecting the crank to the connecting rod. 4. The mechanism of π. 1, characterized in that the central angle between the axes of the crank and the hinge connecting the driven link to the lead is 90 °, and the central angle between the axes of the crank and the hinge connecting the crank to the connecting rod is equal to the central angle between the axes of the hinges of the driven link. to I 12606H