RU2535811C1

RU2535811C1 - Limited slewing executive mechanism

Info

Publication number: RU2535811C1
Application number: RU2013132476/06A
Authority: RU
Inventors: Сергей Сергеевич Наумов; Кирилл Сергеевич Кузьминов
Original assignee: Сергей Сергеевич Наумов
Priority date: 2013-07-15
Filing date: 2013-07-15
Publication date: 2014-12-20

Abstract

FIELD: machine building.

SUBSTANCE: limited slewing executive mechanism comprises cylinders with pistons interacting through the pushers with the lever, connected to the output shaft, the working surfaces of which are designed along the evolvent. The rotation of the output shaft is ensured with two groups of synchronously working pistons through levers, the working surfaces of which are designed along the internal surface of the evolvent. The axis is fixed in internal bearing collars, the external collars of which are installed in the pusher lugs. The executive mechanism contains the limiter excluding the possibility of spontaneous rotation of pushers around own axis.

EFFECT: reliability of limited slewing executive mechanism.

2 cl, 1 dwg

Description

The invention relates to the field of general engineering, namely to part-turn actuators.

The actuator is one of the main elements in industrial automation systems. At present, many various actuators based on various principles of operation have appeared in domestic and foreign practice.

By type of energy consumed, all actuators can be divided into the following groups:

- electric, using electric energy for their action;

- pneumatic, using the energy of compressed air or gas;

- hydraulic, using fluid energy.

The subject of this application is a part-turn actuator of a pneumatic or hydraulic group.

Known part-turn actuator containing cylinders with pistons interacting via pushers with a lever connected to the output shaft, the working surfaces of which are made on an involute with an initial circumference tangent to the axes of the cylinders (Copyright certificate 262573, IPC F15B, publication date 01/26/1970) . This design ensures the application of forces to the working surfaces of the lever along the normals in the entire working range and the constancy of the shoulder on which these forces act.

The disadvantages of this mechanism are:

- great efforts acting in the contact spot of the roller, which leads to the need to increase the diameter of the roller and, as a result, to remove the working surface of the lever from the starting point of the involute and increase the length of the working surface of the lever;

- the use of the outside of the involute as a working one, which leads to a decrease in the contact spot between the roller and the lever;

- the possibility of spontaneous rotation of the pusher around its own axis.

All of these shortcomings lead to a decrease in the reliability of the mechanism.

The technical result to which the present invention is directed is to increase the reliability of a part-turn actuator.

The technical result is achieved due to the fact that the rotation of the output shaft is provided by two groups of synchronously working pistons that transmit force through levers, the working surfaces of which are made on the inner surface of the involute; the axis is fixed in the inner race of the bearings, the outer race of which is installed in the eyes of the pusher, while the mechanism contains a limiter, eliminating the possibility of spontaneous rotation of the pushers around its own axis.

The invention is illustrated in the drawing.

The drawing shows an actuator comprising a housing 1; two cylinders 2, the working cavities of which are interconnected; two cylinders 3, the working cavities of which are interconnected; four pistons 4; four pushers 5, in the eyes of which bearings 6 are installed; axis 7, fixed in the inner race of bearings 6; two two-arm levers 8, the working surfaces of which are made on the inner surface of the involute; output shaft 9.

The presented actuator in the drawing contains four pistons that form two groups: in each of which the working cavities of the cylinders are interconnected, but the number of pistons in each group is not regulated and in other embodiments of the utility model may be different.

The mechanism works as follows. When connecting the working cavities of the cylinders 2 to the discharge line, and the working cavities of the cylinders 3 to the drain line, the pistons 4 of the cylinders 2 are extended and through the pushers 5, bearings 6 and axis 7 turn the levers 8 and the output shaft 9 connected to them counterclockwise; when connecting the working cavities of the cylinders 2 to the drain line, and the working cavities of the cylinders 3 to the discharge line, the output shaft 9 is rotated clockwise. The possibility of spontaneous rotation of the pushers 5 around the longitudinal axis is excluded by the limiter. In this example, it is implemented with a regulated clearance “s” between the lateral planes of the pushers 5 and the walls of the housing 1 parallel to them. In other embodiments, the limiter function can be performed, for example, by combining the axes 7 of two cylinders from the same group.

Unlike the prototype, the working surfaces of the levers are made on the inner surface of the involute. The exception of spontaneous rotation of the pushers around its axis is provided by the limiter, and since the axis is fixed in the inner race of the two bearings, the outer race of which is installed in the eyes of the follower, the force in the race of the bearings is reduced. These signs ensure the reliability of the mechanism and the achievement of the claimed technical result.

Claims

1. Part-turn actuator includes cylinders with pistons interacting via pushers with a lever connected to the output shaft, the working surfaces of which are made on an involute, characterized in that it contains two groups of pistons that provide rotation of the output shaft and transmitting force through the levers, the working surfaces of which made on the inner surface of the involute; the axis is fixed in the inner race of the bearings, the outer race of which is installed in the eyes of the pusher, while the mechanism contains a limiter, eliminating the possibility of spontaneous rotation of the pushers around its own axis.

2. Part-turn actuator according to claim 1, characterized in that the number of pistons in each group can be at least one.