High-torsion transmission screw and sleeve matched with same

Abstract

The invention provides a high-torsion transmission screw and a sleeve matched with the same. The high-torsion transmission screw comprises a screw head unit, a rod body unit and a thread unit; the screw head unit is provided with a supporting piece and a locking piece, wherein the locking piece is provided with a plurality of outwards-convex circular arc parts and a plurality of guidance parts; the section of each guidance part is linear and is sunken inwards between each two adjacent circular arc parts; the rod body unit extends outwards from the bottom surface of the supporting piece of the screw head unit; and the thread unit is arranged around the surface of the rod body unit. With the design of the circular arc parts and the guidance parts, the sleeve and the locking piece generate better gear interlocking effect so as to promote the locking torque and improve the generation of over-screwing on the head part.

Description

technical field [0001] The invention relates to a screw and a matching sleeve, in particular to a high torque transmission screw and a matching sleeve. Background technique [0002] refer to figure 1 , figure 2 , which discloses two kinds of screws that must be driven and rotated by a sleeve 13. The two known screws all include a screw head 11 with a slightly arc-convex top, and a rod body 12 extending outward from the screw head 11. The cross-section of screw head 11 is generally a quadrilateral (as image 3 , Figure 4 shown, where image 3 correspond figure 1 screw, Figure 4 correspond figure 2 screw), and the two screws utilize a matching sleeve 13 to sleeve the screw head 11 to rotate and drive the two screws to rotate. [0003] However, since the screw head 11 is a quadrangle, it is limited by its molding height and whether the diagonal molding is complete or not (for example, the molding height does not correspond to the depth and width of the corresponding...

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Problems solved by technology

[0005] refer to Figure 9 , Figure 10 , is also a screw for the sleeve 13 to drive and rotate, wherein the screw head 11 has an abutment 111, a protrusion protruding from the top surface of the abutment 111 and having a polygonal diagonal star-shaped cross section. piece 112, and a groove 113 formed on the protruding piece 112, as mentioned above, when the polygonal star-shaped screw is sleeved and rotated by the sleeve 13, it can have more stress points to enhance the lock Torque, to avoid the generation of the head over-rotation phenomenon, but the protruding part 112 is a polygonal star shape, in the molding process, its height and the depth and width of the corresponding concave drive groove 131 of the sleeve 13 are more It is easy to produce misalignment, inclination, or the incompleteness of the formed diagonal turning point, resulting in poor engagement between the sleeve 13 and the screw head 11, resulting in insufficient locking torque

[0006] It can be seen from this that the above-mentioned screw is limited by the height of the screw head 11 and whether the diagonal is complete or not, so that when the sleeve 13 rotates, it is easier to apply force to the stress point 14 unevenly. The diagonal corners of the screw head 11 are worn away, so that there is no sufficient locking torque, resulting in over-rotation of the head; moreover, when the sleeve 13 is sheathed on the outside of the screw head 11, it will protrude from the screw The outside of the head 11 takes up the space other than the screw itself, so that the above-mentioned screws can be used for locking and the range is limited and not practical.

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