EA027105B1 - Conical sleeve - Google Patents

Abstract

The invention is related to mechanical engineering for coupling of jointly rotating parts. A conical sleeve having a shape of a truncated cone with a cylindrical bore along the longitudinal axis and a lateral slit along the directrix is made of mated coaxial parts confined between transverse planes parallel to the cone base, with regularly spaced lateral slits of each part and the possibility of fixing positions of the parts relative to each other. The end butt surfaces of the parts may have antifriction coatings.

Description

FIELD OF THE INVENTION

The invention relates to the field of mechanical engineering for joining together rotating parts.

State of the art

Known cylindrical sleeve having an internal axial cylindrical bore that allows you to put this element on the drive shaft (see, for example, the book of D. N. Reshetov Machine parts, p. 84, Fig. 6.5. M .: Engineering, 1989).

The closest in technical essence to the proposed invention is an element connecting the drive shaft to the hub, including a conical sleeve cut along a guide with an internal axial cylindrical hole, allowing to put this element on the drive shaft, and an outer conical wall, on which the hub is worn with fixing it position by fixing bolts. Such removable hubs enter the market under the trademark 8KR, see for example 1_16_2).

Disclosure of invention

The conical sleeve is made in the form of a truncated cone with a cylindrical hole along the longitudinal axis and a side cut along the guide and is made of several (at least two) aligned coaxial parts with regularly spaced side cuts of each part enclosed between transverse planes parallel to the base of the cone, with the possibility fixing the position of the parts relative to each other, and the end surfaces of the joints of the parts may have anti-friction coatings.

The conical sleeve is used in the connection of the drive shaft with the hub to transmit torque due to the friction forces between the shaft, the hub and the hub that occur when the hub is pulled onto the hub. When making a tapered sleeve of parts with fixing the relative position of these parts, the following advantages appear:

more uniform distribution of torque due to the mutual displacement of the side cuts of each of its parts;

Considering the uneven distribution of torque along the length of the sleeve and, as a consequence, the uneven wear of the conical sleeve along the length, it becomes possible to replace part, not the entire connection.

Coating the end surfaces of the joints of the parts of the conical sleeve facilitates the development of transverse deformations of this sleeve, which leads to an increase in the efficiency of its operation.

Brief Description of the Drawings

In FIG. 1 shows a frontal view of a conical sleeve of two joined elements.

In FIG. 2 shows a plan view of a conical sleeve.

In FIG. 3 presents the elements of a conical sleeve with an antifriction coating on the end surfaces of the joints.

In FIG. 4 shows the connection of a drive shaft with a pulley with a conical sleeve.

The implementation of the invention

A truncated conical shaped conical sleeve consists of two coaxial parts 1 and 2 joined together, enclosed between transverse planes parallel to the base of the cone, with a cylindrical hole 3 along the longitudinal axis and a side cut 4 along a guide made in part 1 and turned relative to cut 4 90 ° by a side cut 5, part 2, moreover, on each of the joined end surfaces, fixing grooves 6 (part 1) and 7 (part 2) are made with a retainer 8 (FIG. 1, 2) placed therein.

The end surfaces of the joints of the parts may have anti-friction coatings 7 (Fig. 3).

In FIG. 4 illustrates the use of a conical sleeve, its parts 1 and 2 when transmitting torque, for example, from a drive pulley 10 due to friction forces on the shaft 11. Compression of parts 1 and 2 of the conical sleeve with a thrust washer 12 and a clamping nut 13 due to the absence of the possibility of transverse radial expansion of the sleeve leads to the appearance of friction forces unevenly distributed along the length of the sleeve between the sleeve, shaft and pulley, ensuring joint operation of the joint. Moreover, in the zone of lateral sections, friction forces do not arise, which creates a zone of concentration of shear stresses that worsens the operation of the joint in dynamic mode. A significant reduction in such stresses is facilitated by the elimination of coincidence of cuts of parts 1 and 2 of the sleeve. The magnitude of the friction forces depends, as you know, on the quality of machining of the mating surfaces and the degree of tightening of the clamping nut. The greatest value of the friction forces and torque will occur at the base of the conical sleeve, where the failure of the joint is most likely to occur. In the event of a connection failure, repair is reduced to replacing only one of the two parts of the sleeve. Applying an anti-friction coating on the ends of the mating elements of the sleeve reduces the friction forces between them, preventing the radial movements of the areas of their mating.

Claims (2)

CLAIM 1. A conical sleeve in the shape of a truncated cone with a cylindrical hole along the longitudinal axis and a side slit along a guide, characterized in that the conical sleeve is made of several coaxial parts joined between each other, enclosed between transverse planes parallel to the base of the cone, with regularly spaced side cuts each parts and the possibility of fixing the position of the parts relative to each other. 2. The conical sleeve according to claim 1, characterized in that the end surfaces of the joints of the parts have anti-friction coatings.