CN2736586Y

CN2736586Y - Self-locking anti-theft screwed connection pair

Info

Publication number: CN2736586Y
Application number: CN 200320131108
Authority: CN
Inventors: 郭向洪
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-09
Filing date: 2003-12-09
Publication date: 2005-10-26
Anticipated expiration: 2013-12-09

Abstract

The utility model discloses a screwed connection pair. The center of the tail end face of the screw(7) on the self-locking anti-theft bolt(1) is provided with a blind round hole. The tail end face of the bolt is provided with a cross slot. A taper pin(3) is arranged in the blind round hole of the tail end of the bolt; a cylinder(11) is positioned in the middle segment of the taper pin(3), and a cone(12) whose taper is 15 degrees-30 degrees is positioned on the upper segment. The end face of the cone(12) is a conical end face(13). The diameter of the cylinder(11)on the taper pin(3)is matched with the diameter of the blind round hole. The self-locking anti-theft nut(2) is a nut, one end of which is a blind hole. An internal screw(9) is positioned in the hole and an inner light hole(10) whose diameter is larger than the large diameter of the internal screw(9) is provided near the dead end in the internal screw(9). The screwed connection pair with the structure not only fits for being used in the severe environment such as the vibration, etc, but also effectively solves the problem of the self locking loosing prevention of the large scale screwed connection pair with the theft protection function.

Description

The antitheft pair that is threaded of self-locking

Technical field

The utility model relates to a kind of bolt fastener, the antitheft pair that is threaded of particularly a kind of self-locking.

Background technique

International, the domestic at present self-locking checknut fastening piece that generally adopts mainly contains: 1, use various self-locking nuts to realize the screw thread self-locking; 2, use self-locking screw miscellaneous to realize the screw thread self-locking; 3, in the pair that is threaded, install spring washer additional and realize the screw thread self-locking; 4, bolt is made two-section and is screwed into same nut after, again the body of bolt of outside is instead twisted, to realize locking purpose (mechanical industry standard JB/T9150-1999); 5, China Patent No. is that the patent of ZL01271652.9 disclosed a kind of retaining bolt on October 2nd, 2002, with round tube hole in the bolt center drill, opens symmetric windows at run-out(of thread), penetrates the taper double-screw bolt in the interior round tube hole and tension realizes locking purpose.And the at present antitheft secondary method that is threaded mainly contains: 1, bolt head or nut profile are made various special shapes and twist to prevent to steal; 2, use the fastening workpiece of ring-grooved rivet; 3, being coated with various jellies on the pair that is threaded twists to prevent to steal; 4, penetrate in the bolt and nut body fastening in addition again or the like with wire rope.And the deficiency that the antitheft secondary fastening piece of being threaded of above various self-locking exists is: 1, self-locking and antitheftly do not combine; What 2, locking reliability had is not very high; 3, need to use special-purpose fastened tools; 4, indivedual method processing technology complexity; 5, indivedual method processing costs are higher.

The model utility content

It is reliable that the purpose of this utility model provides a kind of locking property, processing and easy to use, but also have the antitheft pair that is threaded of self-locking of anti-theft feature.

For achieving the above object, the antitheft pair that is threaded of the utility model self-locking is made up of self-locking anti-theft bolt, self-locking anti-theft nut and taper pin, it is that 0.3～0.8 times of screw thread nominal diameter (d), the degree of depth are the blind circular hole of 5～15 times of pitch length (P) that run-out(of thread) end face center on the self-locking anti-theft bolt has a diameter, and it is 3～6 times of pitch length (P) cross recesses that the run-out(of thread) end face has groove depth.Taper pin is contained in the hole, the blind garden of self-locking anti-theft bolt run-out(of thread), and taper pin is that 15 °～30 ° cone is formed by cylindrical body and tapering, and cylindrical diameter matches with blind garden bore dia, and the end face of cone is a tapered end face.Self-locking anti-theft nut one end is a blind hole, and the interior unthreaded hole of internal thread and close cecum is arranged in its hole, the diameter of thread fit of internal thread diameter and self-locking anti-theft bolt, and interior unthreaded hole slightly larger in diameter is in the big footpath of internal thread.

The shape of self-locking anti-theft bolt head can be hexagon head, hexagon socket head, special-shaped first-class in addition; Its profile of self-locking anti-theft nut can be hexagonal, Shi Erjiao, shaped face etc.; The shape of self-locking anti-theft nut blind hole exterior edge face can be semicircle sphere, cylindrical, hexagon etc., and according to arts demand, for ease of processing, the structure of nut body also can be the split composite structure.

The material of making bolt, nut, taper pin is the metallic material that carbon steel, alloyed steel, stainless steel, aluminum alloy, Cuprum alloy etc. can improve its intensity by heat treatment.

The screw thread kind that bolt shank was suitable for is the metric system, English system of machine-processed screw thread class, U.S. mark, MJ screw thread etc.; The diameter of thread of bolt shank is between M6-M30.

After having adopted such structure, make the secondary fastening highly reliable locking property that has that connects that is threaded, can under rugged environment such as vibration, use, effectively solved the big specification locking problem of self-locking of pair that is threaded, and had anti-theft feature.Can be widely used in the fields such as various railways, automobile, electric power, factories and miness, public facility.

Description of drawings

Below in conjunction with accompanying drawing the utility model is described in further detail

Fig. 1 is the antitheft auxiliary structure sectional view that is threaded of self-locking

Fig. 2 self-locking anti-theft bolt structural representation.

Fig. 3 is that self-locking anti-theft bolt A shown in Figure 2 is to view.

Fig. 4 self-locking anti-theft nut structure sectional view.

Fig. 5 is Fig. 4 self-locking anti-theft nut structure left view.

Fig. 6 is the taper pin schematic representation.

Embodiment

The antitheft secondary structure that is threaded of the utility model self-locking is made up of self-locking anti-theft bolt 1, self-locking anti-theft nut 2 and taper pin 3 shown in Figure 1.Be 0.3d～0.8d at diameter of screw thread 7 spiral shell breech face center drills after the 1 screw thread machine shaping of the self-locking anti-theft bolt shown in Fig. 2, Fig. 3, the degree of depth is the blind circular hole 6 of 5P～15P, and having groove depth at the run-out(of thread) end face again is 3P～6P cross recess 8.Form by two sections at the taper pin shown in Fig. 63, the front is a cylindrical body 11 for one section, the cone 12 that one section of back equals 15 °～30 ° for tapering, and the tail end face of cone 12 is a tapered end face 13, the diameter of cylindrical body 11 and hole, blind garden 6 diameters adapt.At self-locking anti-theft nut 2 one ends shown in Fig. 4, Fig. 5 is blind hole, and internal thread 9 is arranged in its hole, at internal thread 9 inboard close cecums the interior unthreaded holes 10 of a diameter greater than internal thread 9 big footpaths is arranged.

During use, by being screwed into of self-locking anti-theft nut 2, self-locking anti-theft nut 2 presses tapered end face 13 promotion taper pins 3 gradually and moves in blind circular hole 6.Because the existence of cross recess 8, cone 12 makes self-locking anti-theft bolt 1 run-out(of thread) diameter produce local elasticity or plastic deformation, the run-out(of thread) port of the part in stretching in the unthreaded hole 10 rises outward, forms a chain of locking phenomenon behind the nut screwing clamping, and nut can not be back-outed from bolt again.

Claims

1, the antitheft pair that is threaded of a kind of self-locking is made up of self-locking anti-theft bolt (1), self-locking anti-theft nut (2) and taper pin (3), it is characterized in that: it is that 0.3d～0.8d, the degree of depth are the blind circular hole (6) of 5P～15P that there is a diameter at screw thread (7) the breech face center on the described self-locking anti-theft bolt (1), and the run-out(of thread) end face has the cross recess that groove depth is 3P～6P (8); Described taper pin (3) is contained in the hole, the blind garden of bolt tail (6), taper pin (3) equals 15 °～30 ° cone (12) by cylindrical body (11) and tapering and forms, the tail end face of cone (12) is a tapered end face (13), and the diameter of the cylindrical body (11) of taper pin (3) cooperates with hole, blind garden (6) diameter; Described self-locking anti-theft nut (2) is that an end is a blind hole, and internal thread (9) is arranged in its hole, in internal thread (9) the inside the one interior unthreaded hole (10) greater than the big footpath of internal thread (9) is arranged.

2, the antitheft pair that is threaded of self-locking according to claim 1 is characterized in that: bolt head (4) be shaped as hexagon head, hexagon socket head, special-shaped head.

3, the antitheft pair that is threaded of self-locking according to claim 1 is characterized in that: self-locking anti-theft nut (2) profile is hexagonal, 12 jiaos or shaped face, nut blind hole exterior edge face be shaped as semicircle sphere, cylindrical, hexagon or split composite structure.

4, the antitheft pair that is threaded of self-locking according to claim 1 is characterized in that: the material of making self-locking anti-theft bolt (1), self-locking anti-theft nut (2), taper pin (3) is that carbon steel, alloyed steel, stainless steel, aluminum alloy, Cuprum alloy or other can improve the metallic material of its intensity by heat treatment.

5, the antitheft pair that is threaded of self-locking according to claim 1 is characterized in that: the screw thread kind that bolt shank was suitable for is metric system, English system, U.S. mark or the MJ screw thread of machine-processed screw thread class.

6, the antitheft pair that is threaded of self-locking according to claim 1, it is characterized in that: the diameter of screw thread (7) is between M6～M30.