RU2347958C1 - Device to lock parts on shaft. - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: device relates to machine building and is intended for quick locking of torque-transmitting parts on the shaft. The proposed device to lock workpieces on the coiled-flexible-tape shaft comprises components deforming the said shaft to a non-circular section. The aforesaid deforming parts represent the sleeves furnished with non-circular holes arranged on both sides of a workpiece or a stack of workpieces. The said sleeves can have oval holes, while the workpiece can be furnished with a circular hole.

EFFECT: reliable locking and quick unlocking, if free run is required.

3 cl, 7 dwg

Description

The present invention relates to parts of machines and is intended for quick fixing and unfastening on the shaft of parts that transmit torque.

Known drive device for quick fixation of the processed shaft in the cartridge [1]. It consists of a sleeve with slots and an elastic plate mounted in these slots. Torque transmission is carried out by friction forces caused by the elastic pressing of the plate to the shaft. Despite the simplicity and adaptability to a different shaft diameter, the device provides the transmission of only small torques.

Known wound shaft with parts mounted on it, of which at least one has a non-circular hole and deforms the shaft on the mating section into a similar surface adjacent to the hole of the part [2]. This connection allows you to transmit torque two to three orders of magnitude more than the analogue [1], but does not provide the detachment of the part and the shaft free movement. This device is taken as a prototype.

The technical result of the invention is the reliable fastening and, if necessary, free-wheeling, quick unfastening of the workpiece on the shaft. This is achieved by the fact that on both sides of the working part or package of working parts of the sleeve wound from an elastic tape, bushings with a non-circular hole are installed that deform the shaft. The bushings have an oval-shaped hole. The workpiece or workpiece package has a round hole.

The device is illustrated by drawings, in which figures 1 and 2 depict a shaft wound from an elastic tape with a package of working parts from two gears in free and fixed positions, respectively: FIGS. 3, 4 and 5 are sections A-A, B-B and C -B in figure 1; 6 and 7 are sections GG and DD in FIG. 2.

The device consists of a shaft 1 wound from an elastic tape, mounted on it working parts with round holes - gears 2 and gears 3, bushings 4 with a non-circular hole and bearings 5 (Fig. 1). The bushings are installed on both sides of the package of parts 2 and 3. If necessary, fastening one part of the sleeve is installed on both sides.

In a free position on the shaft of the gear 2 and the gear 3 (Fig. 1), the bushings 4 are rotated 90 ° relative to each other (Figs. 3, 5). A non-circular hole, for example an oval hole, of one sleeve passes along the shaft length into a rotated oval hole of the other sleeve through a circular section of the shaft in the middle of the package of parts. The diameter of the circular section is smaller than the diameter of the openings of the working parts, so the latter freely rotate relative to the shaft.

For fastening on the shaft of parts 2 and 3 of the sleeve 4 is installed in the same position (figure 2, 6). In this case, the directions of the axes of the ovals coincide, and the size of the major axis exceeds the diameter of the openings of the working parts. The oval surface of the shaft is deformed by the surface of the circular holes of the gear 2 and the gear 3 and fits tightly against them, thereby securing the parts on the shaft in a tight fit.

To transmit the greatest torques, parts 2 and 3 are made with non-circular holes or connected into a block by means of studs or in some other known manner.

Fast fastening and unfastening of the working parts on the shaft is carried out by turning the bushings one relative to another by means of a fork, into the groove of which the outer profile of the bushings enters.

Information sources

1. USSR, ed. testimonial. No. 1094676, MKI B23B 33/00. Lead collar. 1984. Bull. No. 20.

2. USSR, ed. testimonial. No. 1326796, MKI F16C 1/00, 1982. Drive shaft. 1987. Bull. No. 28. Prototype.

Claims (3)

1. A device for securing working parts on a shaft wound from an elastic tape, comprising a deforming shaft in a non-circular section of the part, characterized in that the deforming parts are made in the form of bushings with a non-circular hole and are installed on both sides of the working part or package of working parts. 2. The device according to claim 1, characterized in that the bushings have an oval-shaped hole. 3. The device according to claim 1, characterized in that the working part has a round hole.

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