RU2708403C2 - Motion transmission mechanism - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: present invention relates to machine building, particularly, to gears with flexible links. Mechanism of movement transfer by means of two round pulleys is equipped with two flexible links and two free blocks. One flexible link has kinematic connection with the first pulley and two free blocks that can rotate around their axis. Said link enveloping them forms two tackle so that the link ends are rigidly connected to the part installed on this pulley with possibility of rotation around it. Second flexible link has kinematic connection with the second pulley, enveloping it so that the link ends are connected to tackles formed by the first flexible link, forming two rods. Gear ratio of mechanism is equal to ratio of diameter of one pulley to that of another.

EFFECT: ensuring transmission ratio.

1 cl, 1 dwg

Description

The present invention relates to space technology, in particular, to a mechanism for transmitting motion to structural elements of a solar battery harmonically folded on a spacecraft using articulated joints, each of which contains a round pulley that is rigidly connected to one element and rotatably connected to an adjacent element.

A mechanism for transmitting movement by a flexible coupling (patent RU 97178 U1 F16H 19/06 08/27/2010) is known from the existing state of the art. the connection is movably connected by means of a slider to the thrust of the executive body, which is made in the form of a vertical guide.

A mechanism is known from the prior art for opening harmonically composed structural elements (US Pat. No. 3,733,758 B64G 1/10 04/29/1971), comprising drive means consisting of two disks, each of which is rigidly connected to a corresponding structural element, and connected to each other by a closed belt connected to said disks for transmitting motion. The drive means connects two structural elements that rotate in the same direction under the action of torsion springs. By appropriate selection of the diameter of the disk, the position of the structural elements after deployment is determined.

From the existing level of technology, the closest to the claimed solution (prototype) is a mechanism for transmitting movement by a flexible link (cable, rope, belt, belt, chain, etc.) by means of two round pulleys, one of which is the leading and the other driven, while the gear ratio of such a mechanism is equal to the inverse ratio of the radii of the driving and driven pulley. (I.I. Artobolevsky. Theory of mechanisms. M., 1965, 776 pp., Editor V.A. Zinoviev, pp. 267-269).

The disadvantages of the design solutions described above is the dependence of the gear ratio of the mechanism on the magnitude of the radii of the driving and driven pulley, which can lead to an increase in the mass and dimensions of this mechanism.

The problem to which the invention is directed, is to create a mechanism for transmitting movement in terms of providing a given gear ratio, by changing the design of the flexible link.

The task of the invention is achieved due to the transmission mechanism of the movement by means of two round pulleys, one of which is leading and the other driven. The movement of a particular element of the solar battery design is transmitted by two flexible links, one flexible link has a kinematic connection with the first pulley and two free blocks that can rotate around its axis, embracing them and forming two pulley blocks so that the ends of the link are rigidly connected to the part installed on this pulley with the possibility of rotation around it, the second flexible link has a kinematic connection, with the second pulley covering it so that the ends of the link are connected to the chain hoists, formed and the first flexible link, forming two traction transmitting rods, while the gear ratio of such a mechanism is the opposite if the second pulley is driving and the first driven, or straight if the first pulley is driving and the second driven, the ratio of the diameter of the second pulley and the radius of the first pulley .

In FIG. 1 shows a general view of a motion transmission mechanism with flexible links.

The motion transmission mechanism consists of two round pulleys 1, 2 and two flexible links 3, 4. The flexible link 3 has a kinematic connection with the pulley 1 and free blocks 5, 6, which can rotate around its axis, embracing them and forming two sheaves 8, 9 so that the ends of the link are rigidly connected to the part 7 mounted on this pulley with the possibility of rotation around it. The flexible link 4 has a kinematic connection, with the pulley 2 covering it so that the ends of the link are connected to the chain hoists 7, 8 formed by the flexible link 3, forming two rods 10, 11, transmitting movement. The gear ratio of such a mechanism is equal to:

- если шкив поз. 2 ведущий, а шкив поз. 1 ведомый;

- if the pulley pos. 2 leading, and pulley pos. 1 slave;

- если шкив 1 ведущий, а шкив поз. 2 ведомый,

- if the pulley 1 is leading, and the pulley pos. 2 slave,

Where:

i ₂₁ and i ₁₂ - gear ratio of the mechanism;

R ₁ is the radius of the first pulley;

D ₂ - the diameter of the second pulley.

необходимо гибкое звено 3 протянуть через полиспасты 8, 9, то есть смесить точку «Д» на расстояние

повернув шкив 1, передав движение на шкив 2 и наоборот. Таким образом, за счет использования полиспастов как гибкое звено для передачи движения от одного шкива к другому обеспечивается заданное передаточного отношения за счет изменения конструкции гибкого звена.The movement is transmitted by two rods 10, 11 formed by the chain hoists 8, 9 and the flexible link 4 by means of two round pulleys 1 and 2, one of which is leading and the other driven. When the driving pulley moves, the corresponding flexible link rolls around this pulley, driving the rods 10, 11, which transmit the movement, to the driven pulley, acting on the corresponding flexible link, which rolls around this pulley, moves it. That is, to rotate the pulley 2 and offset the points "B" and "G" (Fig. 1) by a distance equal to

it is necessary to stretch the flexible link 3 through the tackles 8, 9, that is, mix the point "D" at a distance

turning pulley 1, transferring movement to pulley 2 and vice versa. Thus, due to the use of chain hoists as a flexible link for transmitting movement from one pulley to another, a predetermined gear ratio is provided by changing the design of the flexible link.

Claims (1)

The mechanism of transmission of motion by means of two round pulleys, one of which is the leading one and the other driven, characterized in that the movement is transmitted by two flexible links, one flexible link has a kinematic connection with the first pulley and two free blocks that can rotate around its axis, covering them and forming two pulley blocks in such a way that the ends of the link are rigidly connected to the part mounted on this pulley with the possibility of rotation around it, the second flexible link has a kinematic connection with the second pulley, covering it t Thus, the ends of the link are connected to the chain hoists formed by the first flexible link, forming two rods transmitting movement, while the gear ratio of this mechanism is equal to the opposite if the second pulley is leading, and the first driven, or straight if the first pulley is leading and the second driven, the ratio of the diameter of the second pulley and the radius of the first pulley.

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