Actuator

FIELD: machine building.

SUBSTANCE: cylinder and tooth-and-rack mechanism are arranged in case. Piston with rod are fitted inside cylinder. Bead is made on rod end. Tooth-and-rack mechanism comprises rack and toothed sector with output shaft. Separate rack and rod are hinged together. Hinge is made up of groove on rack end and bead to be fitted in slot in assembly. Two screws lock rack to prevent turning about its axis. Rack is mounted on support roller on the side opposite rack toothed section. Axle of said roller is fitted in bracket to rule out rack crosswise shift. Set of shims is fitted between bracket base and casing to allow lifting roller axle, hence, clearance in tooth-and-rack gearing.

EFFECT: ruling skews in kinematic gearing.

4 dwg

 

The invention relates to mechanical engineering and can be used in those areas where it is necessary to rotate the supports at a given angle, in particular in space technology for the disclosure of boarding devices manned transport spacecraft.

As an analogue of the present invention adopted the Executive mechanism described in [1], which includes a housing mounted in the housing shaft with the toothed wheel placed in the cylinder the piston rod, cooperating with the toothed wheel, the rail is installed radially movable relative to the piston and is supported by not less than two rollers, the piston is made through the groove parallel to the longitudinal axis of the piston, and the rail is installed in the groove. The disadvantage is the possibility of occurrence of dry friction moment at the ends of the rails in the slot of the piston because of the bias Reiki arising from the action of radial forces in toothed engagement with the loading shaft torque, which causes additional load on the output shaft of the mechanism.

The closest to the invention is both functional and most common essential characteristics is known lever-gear mechanism of the balancing piston machine with rail, described in [2, str] the construction of which, however, is not without drawbacks. Gear sector, installation is slowly on the shaft, engages with the rack rod piston unit having a piston and rod, and the power cylinder. Stock rail rests on the roller, mounted in the bracket and rotatable about a fixed axis.

The disadvantage is the possibility of wear of the teeth of gears and misalignment of the shaft with the piston due to the torque from the radial forces arising in the gear mesh.

The technical result of the present invention is to improve the reliability of the actuator by removing the possibility of distortions in the kinematic chain.

The technical result is achieved due to the fact that the Executive mechanism, comprising a housing mounted in the housing shaft with the toothed wheel placed in the cylinder piston rod and rod interacting with the toothed wheel, the support roller mounted in the bracket, in contrast to the known, it rake and rod are interconnected by means of a hinge consisting of a flange located at the end of the rod and placed in a groove made in the rail with the two sides of the flange to the rail with two screws, and the rail on the side opposite the teeth, made a longitudinal groove, fitting with anchor roller, while the gearing is made with an adjustable gap with a set of spacers between the bracket and the case.

The difference between the claimed what about the actuator mechanism of the prototype is the rake and the stem is made separately and connected by a hinge, the rail on the side opposite the teeth, performed a longitudinal groove, and the gearing has an adjustable gap.

Thus, thanks to this technical solution makes it possible to improve the reliability of the actuator by removing the possibility of distortions in the kinematic chain.

The implementation of the claimed technical solution is illustrated with a drawing of the actuator. In the drawing figures indicated:

1 - body;

2 - cylinder;

3 - the piston;

4 - stock;

5 rail;

6 - hinge;

7 - toothed sector;

8 - shaft;

9 - support roller;

10 - inlet;

11 - outlet;

12 - strip;

13 - screw.

Case 1 is the cylinder 2 and rack-and-pinion mechanism. Inside the cylinder with the inlet 10 and outlet 11 holes installed the piston 3 with the rod 4. At the end of the rod is made of the flange 6, which is shown in cross-section A-A.

Rack-and-pinion mechanism includes a rail 5 and the toothed sector 7 with the output shaft 8. The rail is connected with the rod 4 by means of the swivel connection, which is made in the form of a groove on the end of the rail and flange 6, which when the Assembly is inserted into the groove. From turning around the axis of the rail is fixed with two screws 13. The side opposite to the toothed part of the rake to its longitudinal groove is installed on the support roller 9, axis which is installed in the bracket that eliminates the possibility of the shift rails in the transverse direction. Between the bracket base and the housing 1 are mounted strip 12, with which you can adjust the rise of the axis of the roller, and therefore, the magnitude of the gap in gear-pinion.

Consider the work of the Executive mechanism.

Upon admission of compressed air through the inlet opening 10 of the piston 3 is moved from one extreme position to the original position of the cylinder 2 to another end position, displaced air exits into the exhaust hole 11. Through swivel 6 piston 3 interacts with the rail 5, which, along with its movement rotates the toothed sector 7, causing the shaft 8 is rotated at a given angle, for example 90. Rake their longitudinal groove rests on the roller 9, the axis of which is installed in the bracket. Strip 12 between the housing 2 and bracket provide the desired amount of backlash in the gear mesh. With the possible rotation of the slats around the longitudinal axis of the angle of rotation is limited by the screws 13.

Efforts arising from the interaction of gears and racks, are compensated by the mobility of the joint and radially-movable location Reiki, eliminating the possibility of bias in the kinematic chain and increases the reliability of the actuator.

Literature

<> 1. Vasocardin, Can. The description of the patent "actuator". Application No. 4943478/29 from 07.06.1991.

2. Try. Mechanisms in modern engineering. Volume II. Lever mechanisms. M.: Nauka, 1971.

An actuator comprising a housing mounted in the housing shaft with the toothed wheel placed in the cylinder piston rod and rod interacting with the toothed wheel, the support roller mounted in the bracket, characterized in that it rake and rod are interconnected by means of a hinge consisting of a flange located at the end of the rod and placed in a groove made in the rail with the two sides of the flange to the rail with two screws, and the rail on the side opposite the teeth, performed a longitudinal groove, fitting with anchor roller, with gearing is made with an adjustable gap with a set of spacers between the bracket and the housing.



 

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