RU4793U1 - CONNECTING CYLINDER PARTS WITH TENSION - Google Patents

Abstract

The connection of cylindrical parts with an interference fit, containing profiled grooves on the mating surfaces, characterized in that annular recesses are made on the surface of the covered part, the end surfaces of which are parallel to the axis of the part, the minimum depth of the recesses in the middle section at the outer radius is zero, while the outer radius of the recess intersects tangent to the inner radius of the recess, parallel to the axis of the part, and oppositely directed adjacent recesses form O-shaped and X-shaped structures of recesses, alternating consistently.

Description

CONNECTING CYLINDER PARTS WITH TENSION

The utility model relates to mechanical engineering, in particular, to the joints of female and male parts, and can be used for tightened joints on cylindrical surfaces.

It is known a connection that contains a female and male parts, therefore annular grooves are made in the female one and ring protrusions are made in the male one, the outer diameter of which is less than the outer diameter of the grooves c - One-piece connection with an interference fit / automatic. St. USSR 5967........... ,

1978 /. This one-piece connection has a radial connection.

parts of the seating surfaces of the covering and covering parts, which significantly reduces the load capacity when transmitting torque. The presence of gaps is also not P0espechi-, it provides the necessary strength of the joint in operation under the influence of variable loads.

A one-piece connection is also known in which noBgpx of the mating parts have annular grooves and protrusions of the same conical profile with a taper direction in the direction of the part to be covered - One-piece connection with an interference fit / automatic.St.SSSR No. 1296754, F 16В4 / 00.1985 /.

The surfaces of the parts of this connection have a complex shape, which makes it difficult to install the connection due to unsatisfactory

f. -. V-v. T1

centeredness. In addition, this solution involves applying an adhesive composition to the surface of the covered part.

The invention is adopted as a prototype. The connection of female and male parts with an interference fit / autowork No. 665128, FI6B4 / 00, 1978 /, in which the connection of the female and male parts occurs on cylindrical surfaces provided with profiled elements in the form of protrusions with chamfers formed by longitudinal grooves, the width of the protrusions of both parts being less than the width of the grooves, and these parts are joined by the tips of the protrusions with an interference fit.

The disadvantage of this device is that a smaller part of the seating surface is involved in the formation of an interference fit, and this reduces the loading capacity of the joint. An exact match of the protrusions of the parts to be mated is also required, since the mismatch leads to an even smaller contact area and, consequently, to a reduction in load capacity. A disadvantage should also be considered that with a slight mutual rotation of the mating parts, when the protrusions are oriented against the depressions, a complete loss of interference will occur.

The task to which the claimed utility model is directed is to increase the operational reliability and load capacity of the connection of cylindrical parts with interference.

The proposed device for connecting cylindrical parts with an interference fit, containing corrugated grooves on the mating surfaces, is made with circular grooves on the surface of the covered part. The end surfaces of the recesses are parallel to the axis of the part. The minimum groove depth in the middle section at the outer radius is zero, while the outer radius of the groove intersects the tangent to the inner radius of the groove parallel to the axis of the part. Multidirectional neighboring grooves form 0-shaped and X-shaped groove structures alternating sequentially.

The solution to the technical problem is illustrated by the drawings: Fig.1 connection of cylindrical parts with interference; figure 2 is a cross section of a covered part (non-expanded section AA, see FIG. 3); Fig.Z - scan of the cylindrical surface of the covered part.

The interference fit consists of spanning I and absorbable 2: parts. The mating surface 3 of part 2 contains annular recesses 4 with end surfaces 5. The minimum depth of recesses in section AA at the outer radius 6 of recess 4 is zero and increases towards the end surfaces of the part, while the outer radius of the recess intersects tangent 7 to the inner radius 8 grooves.

To assemble the joint, the male part I is heated to a temperature providing a collapsible gap, mounted on the mating part 2 and cooled to form an interference fit. As a result of elastic deformation, the female surface of part I fills the annular grooves 4 of the female surface 3 of part 2. The curved profile of the grooves 4 and the increasing depth of the grooves from section AA (see Fig. 3) to the end surfaces of the part provide a discrete strained state at the contact points of the mating surfaces, while on the cylindrical surfaces of the contact stress increases, and in places of annular outflows decrease. The intersection of the outer radius b of tangent 7 to the inner radius 8 ensures accurate centering of parts I and 2 along cylindrical surfaces, because for any section of part 2 by a plane passing through the axis of part 2, connection behind tangent 7 occurs along cylindrical surfaces. The multidirectional curvature of the radii of two adjacent grooves forms 0-shaped 9 and X-shaped 10 structure of the grooves, alternating sequentially.

When the workload of the compound is manifested, the wedge effect of the deformation of the material of part I into the annular grooves of part 2 is due to O-shaped and X-shaped groove structures in which the material simultaneously experiences compression and tensile stresses.

The test results of the proposed technical solution have confirmed a significant increase in the load capacity and operational reliability of the connection of cylindrical parts with an interference fit under reverse loading simultaneously by axial force and torque.

Vice-Rector of Academies j J / J J Volodin

Claims (1)

The connection of cylindrical parts with an interference fit, containing profiled grooves on the mating surfaces, characterized in that annular recesses are made on the surface of the covered part, the end surfaces of which are parallel to the axis of the part, the minimum depth of grooves in the middle section at the outer radius is zero, while the outer radius of the groove intersects tangent to the inner radius of the recess, parallel to the axis of the part, and oppositely directed adjacent recesses form O-shaped and X-shaped structures of recesses, alternating consistently.