SU1707323A1 - Self-cleaning nut - Google Patents

Abstract

The invention relates to the field of mechanical engineering, namely to threaded joints. The purpose of the invention is to increase the cleaning efficiency. The nut is provided with bevels on the ends. The bevels are formed by two mutually perpendicular planes 2 and 3. One of the planes 2 coincides with the chord of the nut end, which intersects the central hole of the nut, and is made a width equal to the thread pitch. The other plane 3 is perpendicular to the side surface of the nut. The bevels form the edges 4, interacting with the surface of the screw thread. The nut ensures the cleansing of the screw thread profile with the sharp edges of one end of it when rotating in different directions. 3 il.

Description

Fm.z

The invention relates to mechanical engineering and can be used in threaded joints operating in a polluted environment, for example, tensioning devices, tracked undercarriage equipment, conveyors on elevators, grain receiving stations, etc.

A joint is known that contains a screw and a nut, on the mountaineers of which there are steps with sharp edges interacting with the surface of the screw thread,

Known is the nut, which at the ends is screwed bevels with a sharp edge, made only on the front side of the ends, the width of which is equal to the thread of the thread and aligned with the grooves made at the ends for removal of the cleaned dirt.

The disadvantage of these technical solutions is the high labor intensity of manufacturing the nut, the low cleaning efficiency of the thread due to the possibility of cleaning the sharp edges of one end only when the nut rotates in one direction, and this, if there is a gap in the threaded connection, causes of the direction of rotation (and, consequently, of the effort to cut the hole) at a distance not less than the height of the nut, it passes along the uncleaned one side of the thread profile.

The purpose of the invention is to increase the cleaning efficiency.

This goal is achieved by the fact that the bevels are made in the form of mutually perpendicular planes, one of which coincides with. the chord of the nut butt intersecting the central hole of the nut, and made a width equal to the thread pitch, and the other perpendicular to the lateral surface of the nut. In this case, the chord of the nut butt is located from the axis of the nut body at a distance

eh slna.

where d is the outer diameter of the thread of the nut;

about. - cutting angle, depending on the material that pollutes the thread joint and is made within the limit of 15 ° C °.

At a 60 °, the cutting is sharply deteriorated. 15soskos wear out quickly,

Performing the bevels in the form of mutually perpendicular planes, one of which coincides with the chord of the nut end, which intersects the central hole of the nut, and the other perpendicular to the side surface of the nut, reduces the labor intensity of manufacturing 1,; and increasing efficiency. ,.P . i2K as one end of the nut ,, g g, screw mri turn to different s-lights

Performing a bevel plane that coincides with the chord of the nut end, equal to the pitch of the thread, ensures in all cases the cleaning of the full thread profile

piita.

The location of the chord from the axis of the nut housing at a distance a allows the optimal angle of

bevels and, consequently, optimal cleaning conditions for the thread profile.

FIG. 1 depicts the proposed self-cleaning nut, general view; FIG. - section A-A in FIG. 1: in FIG. 3 nut, axonometric.

The self-cleaning nut consists of body 1, on both ends of which bevels are made in the form of mutually perpendicular planes 2 and 3, one of which 7

coincides with the chord of the highlander nut, which intersects the central hole of the nut, and is made a width equal to the thread pitch; the other 3 is perpendicular to the side surface of the nut. Bevels form lying each

against each other, the sharp edges 4 interacting with the surface of the screw thread 5. The chord of the nut end is located from the axis of the body 1 at a distance a, which is determined depending on the angle of cutting a from

the expression a 0.5 d slna. where d is the outer diameter of the nut thread.

The cutting angle varies depending on the tensile strength or hardness of the material contaminating the thread and is in the range of 15 ° and 60 °. When screwing or unscrewing the nut, the sharp edges 4, moving relative to the contaminated thread profile of the screw 5. Cut off the dirt from it, which is packed in the process

work. Moreover, the cleaning of the thread profile of the screw 5 is provided with sharp edges 4 of one nut end when rotating in different directions.

The use of the invention will allow

Increase productivity by up to 3% when operating automatic machines due to reduced maintenance. When deploying in telescopic conveyors, where in Kc -iecTuc the drive uses propeller desks, the performance is also the age of years g; L% due to the reduction in the number of failures and the reason for the jamming of a threaded joint operating, as a rule, in a dusty atmosphere in elevators and mills.

Claims (1)

Claims Self-cleaning nut, made with bevels on highlanders / sharp edges, fine; : -Meaning bevel & m, different with By the fact that, in order to increase the cleaning efficiency, each bevel is made in the form of a step, the surfaces of which are mutually perpendicular, one of the surfaces is located perpendicular to the lateral 5 or 15 ° and 60 °. the surface of the nut, and the other - at a distance a –k sin a from the axis gai equal to the thread pitch, where d is the d nut; but. - cutting angle, with Nor is 15 ° and 60 °. nii a-k sin a from the axis of the nut and the width equal to the thread pitch, where d is the thread diameter of the nut; but. - cutting angle, with the cutting angle Phie.1 FIG. 2