RU2277649C1 - Keyed joint - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: keyed joint comprises male and female members that are interconnected by means of draw key fitted in their coincident grooves and transmit the peripheral and axial load through the groove made in the face surface of the male member. The profiles of the key grooves in the face surfaces of the male and female members are trapezoidal. The trapezoidal key is fitted with interference from the side of the female member. The smaller base of the key is set in the trapezoidal grooves at the level of the face surfaces of the members over the length at least equal to the outer diameter of the female member.

EFFECT: expanded functional capabilities.

1 dwg

Description

The invention relates to mechanical engineering and can be used in the assembly units of machines and equipment for connecting, mainly, thin-walled parts using the keys on the side of their end surfaces.

Known are the key connections of the shaft and the parts worn on it, for example a gear wheel, pulley, etc., with the help of a tightening key, fitted in the keyways of the shaft and hub of the part and transmitting circumferential and axial forces. (Book. New Polytechnical Dictionary / Gl. Ed. A.Yu. Ishlinsky. - M.: Big Russian Encyclopedia, 2000. - 671 p .; ill.). A disadvantage of the known key connection is the insufficient transmission of axial force due to the friction forces obtained by landing the hub of the part on the shaft.

It is known that the shaft is keyed with the locking screw covered by its part, located at an angle to the joint axis in the longitudinal plane, and with a segment key located in the hole of the shaft socket and in the keyway of the part in contact with the working end of the screw, for which a transverse groove of the triangular profile, one of the surfaces of which is parallel to the axis of the locking screw and the other is perpendicular, and the working end of the screw is made with a flat end surface and is located in the transverse groove of the key and the keyway in the part is made with a bottom parallel to the axis of the connection, which, along with the circular axis, simultaneously provides axial fixation of the shaft with the part covered by it. (Copyright certificate SU No. 1661486 A1. Keyed connection. - IPC ⁵ F 16 B 3/00. - Bull. No. 25 dated 07/07/91). A disadvantage of the known keyed connection is the complexity of such a connection, which is permissible only for connecting thick-walled parts.

A key connection of the shaft with the part covered by it is known, containing a segment key and a fixing element installed in their aligned grooves, and the groove for the key in the covered part is made on its end surface with the same radius and from the same center as the groove on the shaft, and the key installed in the grooves of the shaft and the enclosing part at an angle of 30-60 ° to the axis of the shaft, and the locking element is made in the form of a conical flange sleeve in contact with the inner conical surface with a key and secured by flanges on the enclosing part whether increasing simultaneously with the circular and axial fixation of the shaft with the part covered by it. Copyright certificate SU No. 1089311 A. Keyed connection. - IPC ³ F 16 V 3/00. - Bull. No. 16 dated 30.04.84). This invention is taken as a prototype.

A disadvantage of the known key connection adopted for the prototype is its complexity, on the one hand, and, on the other hand, such a connection requires an additional shaft extension from the part covered by it to the length of the key, and also does not provide a key connection between hollow thin-walled parts.

The main task to which the claimed key connection is directed is to expand the ability to transmit circumferential and axial forces through the key connection, mainly of hollow thin-walled parts.

The technical result achieved by the implementation of the claimed invention is the ability to transmit circumferential and axial forces with a key connection of female and male thin-walled parts.

The specified technical result is achieved by the fact that in the known key connection, which consists in connecting the male and female parts with the help of a tightening key, fitted in their compatible grooves and transmitting the circumferential and axial forces through the groove made on the end surface of the female part, according to the proposed technical solution grooves are made with a trapezoidal profile on the end surfaces of the male and female parts and from the side of the latter, a trapezoidal veneer is fitted with an interference fit ka, laid in trapezoidal grooves with the lower side of the base at the level of the end surfaces of the parts at a length at least equal to the outer diameter of the enclosing part.

The analysis of the prior art cited by the applicant has made it possible to establish that there are no analogs characterized by sets of features identical to all the features of the claimed keyed connection. Therefore, the claimed technical solution meets the condition of patentability "novelty."

The search results for known solutions in the art in order to identify features that match the distinctive features of the prototype of the features of the claimed technical solution have shown that they do not follow explicitly from the prior art. From the prior art determined by the applicant, the influence of the transformations provided for by the essential features of the claimed technical solution on the achievement of the specified technical result has not been revealed. Therefore, the claimed technical solution meets the condition of patentability "inventive step".

The drawing shows a key connection diagram.

The essence of the proposed key connection is to connect the male 1 and female 2 parts with a long trapezoidal key 3 of length l equal to at least the outer diameter D of female component 2, which is inserted with interference on the periphery side into compatible keyways 4 of the trapezoidal profile made on the end surfaces 5 and 6, respectively, covered 1 and covering 2 parts, and the base 7 with a smaller width b _min keys 3 at the level of the end surfaces 5 and 6 of parts 1 and 2.

Key connection is as follows.

At the ends of the male 1 and female 2 parts, compatible keyways 4 of the trapezoidal profile are made, made on the end surfaces 5 and 6, into which, with an interference fit from the periphery of the female part 2, a tight trapezoidal key 3 with a length l equal to at least , the outer diameter D of the female part 2, the base 7 with a smaller width in the direction of end surfaces of the parts 1 and 2. Flush b _min trapezoidal tongue 3 transmits circumferential M _cr P and axial force simultaneously from the male part 1, and the female part 3 and the inclined sides of the trapezoidal tabs 3 8, and the corresponding flanks into four trapezoidal grooves formed on the spline 3 at an angle α <90 ° to the base 7.

The proposed key connection will allow more efficient to connect hollow thin-walled parts and transmit circumferential and axial forces from one part to another.

Claims (1)

The key connection, which consists in connecting the male and female parts with a tightening key fitted in their compatible grooves and transmitting circumferential and axial forces through a groove made on the end surface of the female part, characterized in that the key grooves are made with a trapezoidal profile on the end surfaces of the male and covering parts and from the side of the latter with an interference fit, a trapezoidal key is inserted into the trapezoidal grooves with a base with a smaller width at the level of the end faces surfaces of the parts at a length at least equal to the outer diameter of the enclosing part.