Screw

Abstract

The invention belongs to the technical field of positioning pieces, and particularly relates to a screw. The screw comprises a screw head and a screw section formed by extending downwards from the screw head, wherein the screw section comprises a rod body formed by extending downwards from the screw head and a plurality of teeth portions formed outside the rod body; the screw head comprises a screw head main body and a starting plane arranged at one end of the screw head main body; a screw groove is formed in the screw head; the cross section of the screw groove has a closed structure consisting of five sequentially connected n-shaped convex teeth. Compared with the prior art, the cross section of the screw groove in the screw has the closed structure consisting of the five sequentially connected n-shaped convex teeth, and a stress effect is adequately considered, so that the groove profile is higher in torque transmission characteristic and the radial force with concentrated stress cannot be caused during fastening, a real 0-degree driving angle is realized, the radial force is eliminated, the driving performance of screw twisting is improved, the service life of the tool is prolonged, and the labor processing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of positioning parts, and in particular relates to a screw. Background technique [0002] The screw starting grooves currently on the market are prone to generate radial force due to the driving angle greater than 0 degrees, resulting in torque loss, resulting in insufficient engagement between the screwdriver and the screw groove, and a decrease in the transmitted torque value; and the inner wall of the groove has a taper, The small load force on the end surface will cause the screwdriver to slip easily when screwing the screw, damage the screw starting groove, and then cause serious consequences that the screw cannot be screwed in or out. [0003] In view of this, it is necessary to provide a screw whose screw groove is set in a "five-leaf" shape (or five-butterfly shape), which realizes a real 0° driving angle, eliminates radial force, and improves screw tightening. driving performance, thereby prolongin...

AI Technical Summary

Problems solved by technology

[0002] The screw starting grooves currently on the market are prone to generate radial force because the driving angle is greater than 0 degrees, resulting in torque loss, resulting in insufficient engagement between the screwdriver and the screw groove, and a decrease in the transmitted torque value; and the inner wall of the groove has a taper, The small load force on the end face will cause the screwdriver to slip easily when screwing the screw, damage the screw starting groove, and then cause serious consequences that the screw cannot be screwed in or out

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