RU2531854C2 - Movement conversion mechanism - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to machine-building industry, and namely to devices for conversion of non-uniform rotational movement to uniform, and vice versa. The mechanism includes housing (1), drive shaft (2) being a power take-off shaft, hollow shaft (3) installed coaxially to the drive one, and a movement conversion assembly. The movement conversion assembly is made in the form of disc (4) installed in the housing coaxially to the shafts and in the centre of which there is shaped roller path (5). Between shaft (2) and the roller path there arranged is even number of rollers, the half of which is rotated about its own axis, and both in pairs and cross-shaped are rigidly attached through brackets (10) and (11) to drive and hollow shafts. The rest rollers are freely located between roller path (5) and rigidly attached rollers.

EFFECT: improving reliability and increasing efficiency of the mechanism.

5 cl, 5 dwg

Description

The invention relates to mechanical engineering, and in particular to devices for converting uneven rotational motion into uniform rotational motion, for example, the vibrational-rotational motion of the rotors of the blades in the uniform motion of the output shaft, and vice versa.

A known mechanism for converting motion, comprising a housing, a drive shaft, a cam mounted on the housing coaxially to the drive shaft, a disk with guides, a rhombic articulated four link with fingers interacting with the cam and the guides, an additional drive shaft mounted coaxially with the main drive shaft, levers and a driven the shaft, drive shafts are pivotally connected by levers to the midpoints of opposite sides of the articulated four-link, and the disk is mounted for rotation and mechanically connected to the driven shaft (see. p. 724850 dated 05/30/78).

The disadvantage of this device is the lack of smooth conversion of motion.

Closest to the claimed combination of essential features and the achieved result is a mechanism for converting movement, comprising a housing, a main drive shaft, a second drive hollow shaft mounted coaxially with the drive drive shaft, a driven shaft, which is a power take-off shaft, and a motion conversion unit including a profiled a cam, a disk with guides on the plane of the disk in the form of slots, a rhombic articulated four-link with fingers located at its vertices and interacting with the cam m and guides, the drive shafts are pivotally connected with the midpoints of the opposite sides of the four-link, the disk is mounted rotatably and mechanically connected to the driven shaft, and the cam profile, described by the dependence of the polar radius on the polar angle α and the length of the four-link side, is equidistant, spaced by an amount the radius of the finger inward from the base closed curve (see RF patent 2374526 from 01.10.2007).

The known device operates as follows. When alternating opposite identical identical torques are applied to the drive shafts, the fingers of the articulated four-link slide along the cam profile and, moving along the guides, transmit rotation to the disk. It summarizes the moments of the drive shafts and, transmitting the total moment to the driven shaft, drives it into rotation.

In the known device, the reliability of the movement conversion mechanism is increased by improving the smoothness of the conversion by providing a sinusoidal change in the angle between the levers while simultaneously rotating the diagonals of the four link in the polar angle. However, with any other cam profile that does not belong to the equidistant family, as well as another placement of fingers on the four-link and the location of the guides on the disk, the transformation will be accompanied by jerks and bumps (violation of smoothness). Unmatched execution, a rather complex design, the relative complexity of manufacturing a large number of non-standard parts reduces the advantages of the known device.

The task of increasing the reliability, efficiency and manufacturability of the manufacture of the claimed mechanism.

The technical result of increasing reliability and efficiency is achieved by simplifying the mechanism, reducing the number of rubbing parts. The manufacturability is improved due to the use of mainly mass-produced parts and in much smaller quantities than in the prototype.

The problem is achieved in that in the movement conversion mechanism comprising a housing, a drive shaft, a second hollow shaft mounted coaxially to the drive shaft, and a motion conversion unit according to the invention, the conversion unit is made in the form of a disk mounted in the housing coaxially to the shafts, in the center of which profiled raceway, between which an even number of rollers are placed between the hollow shaft, half of which rotate around its own axis and are rigidly connected in pairs and crosswise through the brackets with the leading and second shafts, and the rest are freely located between the rigidly connected rollers and the raceway, and the drive shaft is a power take-off shaft.

The task is also achieved by the fact that the rollers are made hollow. The task is also achieved by the fact that the free rollers in diameter are larger than those rigidly fixed by an amount that excludes touching the raceway with hard rollers.

The task is also achieved by the fact that with an increase in the number of rigidly connected rollers with a multiplicity of more than one, they are placed on their axis of rotation in parallel, and the free rollers are offset along this axis, and the width of the raceway increases proportionally.

The task is also achieved by the fact that the disk is installed in the housing on the elastic elements.

Figure 1 shows a General view of the mechanism with nodes separated in the axial direction.

Figure 2 shows the conditionally initial position of the rollers in the profiled race of the disk with an angle between the axes of the pairs of rigidly fixed rollers α = 60 deg.

Figure 3 shows the position of the rollers in the raceway when the drive shaft is rotated 60 degrees, while the angle α = 90 degrees.

Figure 4 shows a section along aa in figure 3.

Figure 5 shows the layout of the doubled number of hard rollers on its axis of rotation with the displacement of free rollers on this axis. In this case, the disk width is proportionally increased.

The best embodiment of the inventive mechanism for converting the movement of FIGS. 1-5 comprises a housing 1, a drive shaft 2, which is a power take-off shaft, a second hollow shaft 3, which is installed coaxially with the drive shaft 2, and a motion conversion unit, including a shaft located coaxially , 3 a disk 4, in the center of which a profiled raceway 5 is made, between which and a shaft 2 eight hollow rollers are placed, four of which 6-6 'and 7-7' rotate around their own axis and are paired and crosswise rigidly connected to the leading 2 and second 3 in lamellas through brackets 10 and 11, respectively, the remaining four rollers 8-8 'and 9-9' are freely located between the rigidly connected rollers 6-6 'and 7-7' and the raceway 5. For example, when using the inventive mechanism for converting movement into rotor -blade internal combustion engine (RLDVS) rollers 6-6 'through the bracket 10, the drive shaft 2 will be connected to the blades of the first rotor, and the rollers 7-7' through the bracket 11, the shaft 3 will be connected to the blades of the second rotor. The rollers in figure 1-5 are made cylindrical, but can be barrel-shaped, spherical and other shapes.

The work of the proposed mechanism will consider the example of its work as part of the radar. When starting the radar, the first rotor begins to rotate and, consequently, the drive shaft 2 and the rollers 6-6 '. In this case, the rollers 6-6 'press on the rollers 8-8', moving them. The latter, in turn, press on the rollers 7-7 ', which move the rollers 9-9'. All the rollers roll inside the track 5, and the rigidly fixed rollers 6-6 'and 7-7', rotating around their own axis, do not touch the raceway 5, as they are made with a smaller diameter than the freely located rollers 8-8 'and 9- 9'. The shaft 2, and therefore the blades of the first rotor, due to the difference of inertia with the shaft 3 rotate at a constant angular speed, and the shaft 3 with the blades of the second rotor oscillate. For one revolution of the rigidly connected rollers inside the profile of raceway 5, the full cycle of the four-stroke radar is completed. The shock loads that occur in the radar and, consequently, in the shafts, are compensated by elastic elements in the form of hollow rollers, and a disk 4 with a profiled raceway 5 is installed in the housing on elastic elements (not shown in Figs. 1-5). The mechanism can also work with a hard disk in case 1, but with less efficiency. To reduce the sliding friction force of the rollers between themselves, the embodiment of FIG. 5 is used with twice the number of rigidly connected rollers 6-6 'and 7-7'. The profile of raceway 5 is calculated by conventional design, based on the angle α between the rollers 6-6 'and 7-7' (the angle of convergence and divergence of the rollers 6-6 'and 7-7').

The main advantage of the claimed mechanism compared to the prototype is the simplicity and manufacturability, as the number of parts has been drastically reduced, most of which, with the exception of the disk with a profiled raceway, are of serial production. Using the drive shaft as a power take-off shaft eliminated the need to use an additional third shaft for power take-off. By reducing the number of parts, as well as the number of rubbing parts, the axial load on the shafts decreased, and consequently, the reliability, efficiency of the mechanism and the durability of operation increased. Thus, we have a big gain in both quality and price.

Claims (5)

1. The mechanism for converting movement, comprising a housing, a drive shaft, a second hollow shaft mounted coaxially to the drive shaft, and a motion conversion unit, characterized in that the conversion unit is made in the form of a disk installed in the housing coaxially to the shafts, in the center of which a profiled raceway is made between which and the second shaft there is an even number of rollers, half of which rotate around its own axis and are rigidly connected in pairs and crosswise through brackets to the drive and second shafts, and the rest are free located between the rigidly connected rollers and the raceway, and the drive shaft is a power take-off shaft. 2. The mechanism according to claim 1, characterized in that the rollers are hollow. 3. The mechanism according to claim 1 or 2, characterized in that the free rollers are larger in diameter by more than rigidly connected by an amount excluding the contact of the rigidly connected rollers of the raceway. 4. The mechanism according to claim 1 or 2, characterized in that when the number of rigidly connected rollers with a ratio of more than one increases, they are placed on their axis of rotation in parallel, and the freely located rollers are shifted along this axis, and the width of the raceway increases proportionally. 5. The mechanism according to claim 1, characterized in that the disk is mounted in the housing on elastic elements.

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