CN201184353Y - Heterodont anti-loose and anti-drop bolt - Google Patents

Abstract

The utility model discloses an anti-loosening and anti-drop bolt with abnormally-shaped teeth, which comprises a bolt body, and internal thread tooth-shaped bodies arranged at the periphery of the bolt body at equal interval, wherein each internal thread tooth-shaped body in the bolt body has a jacking surface and a withdrawing surface; a wedge-shaped bevel extends from the jacking surface to intersect with the withdrawing surface of an upper adjacent internal thread tooth-shaped body to form a thread groove matched with a screw or the outer screw thread of a bolt; an angle alpha equal to 22 DEG to 27 DEG is formed between the wedge-shaped bevel and the thread screwing direction of the bolt body; and the direction of the wedge-shaped bevel is identical to the thread screwing direction of the nut body. The anti-loosening and anti-drop bolt can eliminate the radial gap between the teeth and greatly improve the helical friction force to better prevent loosening and falling when encountering various kinds of larger loads, thereby radically solving the anti-loosening and anti-drop problem of thread connection. Additionally, the anti-loosening and anti-drop bolt has simple manufacture, convenient use and no need for additional accessories.

Description

The locking anticreep bolt of heterodont

Technical field

The utility model relates to the middle technical field of fastening of using that is threaded in the mechanical parts, the locking anticreep bolt of particularly a kind of heterodont.

Background technique

In machinery assembling field; the assembling of very most parts such as machinery equipment and assembly is that the connection by threaded fastener realizes; but under the continuous effect of high vibration and all kinds of alternate loads; regular screw threads connect the phenomenon that can occur getting loose voluntarily usually; cause to connect and lost efficacy; thereby the security of operation to equipment and vehicle etc. causes a hidden trouble, even causes the accident.In order to solve this problem that gets loose of screw thread, people design a lot of ways.General employing increases lock washer, inlays trivial of nylon, wears check pin, colludes the phenomenon that gets loose voluntarily that screw thread is avoided in locking measures such as locking spring, abnormal screw thread and chemical gluing.Many shortcomings such as but all ubiquity such as the installation cost height, installing space is big, assembly technology is complicated in these locking measures, repeat usage is low and anti-loosing effect is not good.Therefore designing a kind of threaded fastener simple in structure, easy for installation and that anti-loosing effect is good becomes the difficult problem that the loosing Prevention Technology field presses for solution.A kind of preferably technology is that the patent No. is that the Chinese utility model patent " checknut connection part " (notification number is CN2733064Y) of ZL200420112197.X is exactly this type of design; Comprise chek bolt connection part and backing-up screw connection part, on the bottom surface of nut or screw head, be provided with at least two sharp-tooth shaped projectioies, and become radial and be evenly arranged on this plane; And on the upper and lower surface of compression spring, be provided with at least two sawtooth projections, and become radial and be evenly arranged on this two plane.Anti-loose structure according to this design, mainly be zigzag protruding block, but the making of this zigzag protruding block is highly lower, be a kind of bar rib of regular arrangement, the pawl function that it had a little less than, the promptly unmatched sword and retreat advantage smoothly of charging, zigzag protruding block wearing and tearing are very fast, be actually disposable using effect, do not have repeatedly dismounting and the advantage of installation, so its relative user cost is higher; And the use of this structure is based on screw and pad, or the combination of nut and pad, and the protruding block structure that also must dispose pad when making screw or nut is loaded down with trivial details, whole usability and obtain anti-loosing effect bigger reduction is all arranged.

Summary of the invention

Technical problem to be solved in the utility model is the present situation at prior art, provides a kind of making simple, safe and convenient to use, and more reasonable structure is simple, the locking anticreep bolt of heterodont that can cooperate with plain nut and use repeatedly.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: the locking anticreep bolt of heterodont, comprise the body of bolt, body of bolt body periphery is shaped on the internal thread tooth form body that uniformly-spaced is provided with, each thread profile body all has the roof pressure face and moves back the flank of tooth in the body of bolt, the roof pressure face is extended with a wedge shape inclined-plane, and this wedge shape inclined-plane extends and intersect with the flank of tooth that moves back that is positioned at the adjacent internal thread tooth form body in upper end, and constitutes the thread groove of adaptive screw outside thread tooth; Wedge shape inclined-plane and the screw thread of the body of bolt are screwed into direction and become α=22 ° to 27 ° angle, and the direction on this wedge shape inclined-plane and body of bolt screw thread to be screwed into direction identical.

The measure of taking also comprises:

Above-mentioned roof pressure face and the angle that moves back between the flank of tooth are 60 degree.

The middle footpath of the above-mentioned body of bolt is provided with bigger than footpath in the common standard bolt according to the pitch structure, span is 0.1 millimeter to 1.0 millimeters.

Compared with prior art, each thread profile body all has the roof pressure face and moves back the flank of tooth in the body of bolt that the utility model adopts, the roof pressure face is extended with a wedge shape inclined-plane, and this wedge shape inclined-plane extends and intersect with the flank of tooth that moves back that is positioned at the adjacent internal thread tooth form body in upper end, and constitutes the thread groove of adaptive screw outside thread tooth; Wedge shape inclined-plane and the screw thread of the body of bolt are screwed into direction and become α=22 ° to 27 ° angle, and the direction on this wedge shape inclined-plane and body of bolt screw thread to be screwed into direction identical.When running into all kinds of bigger alternate load, owing to eliminated the radial clearance of between cog and increased helix frictional force greatly, can play good locking anticreep effect, from with this solved the locking anticreep problem that is threaded, and make simple, easy to use, need not increase annex in addition.

Description of drawings

Fig. 1 is the utility model embodiment's a schematic representation;

Figure 1A is the A portion enlarged diagram of Fig. 1;

Fig. 2 is the practical application schematic representation of Fig. 1.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

To embodiment shown in Figure 2, figure grade illustrates as Fig. 1: the body of bolt 1, and internal thread tooth form body 1a, roof pressure face 1b moves back flank of tooth 1c, wedge shape inclined-plane 1d, screw 2.

The locking anticreep bolt of heterodont of the present utility model, comprise the body of bolt 1, the body of bolt 1 body periphery is shaped on the internal thread tooth form body 1a that uniformly-spaced is provided with, each thread profile body 1a all has roof pressure face 1b and moves back flank of tooth 1c in the body of bolt 1, roof pressure face 1b is extended with a wedge shape inclined-plane 1d, and this wedge shape inclined-plane 1d extends and intersect with the flank of tooth that moves back that is positioned at the adjacent internal thread tooth form body in upper end, and constitutes the thread groove 1e of adaptive screw outside thread tooth; Wedge shape inclined-plane 1d and the screw thread of the body of bolt 1 are screwed into direction and become α=22 ° to 27 ° angle, and the direction of this wedge shape inclined-plane 1d and the body of bolt 1 screw thread to be screwed into direction identical.Above-mentioned roof pressure face 1b and the angle that moves back between the flank of tooth 1c are 60 degree.The middle footpath of the above-mentioned body of bolt 1 is provided with bigger than footpath in the common standard bolt according to the pitch structure, span is 0.1 millimeter to 1.0 millimeters.

The application of present embodiment: after the body of bolt 1 is screwed to the precalculated position and is subjected to certain prefastening torque, the screw 2 outside thread cusps that cooperate will withstand on the distinctive wedge shape of the body of bolt 1 internal thread inclined-plane tightly, the tooth top actual gap that makes the body of bolt 1 internal and external threads is zero, thereby eliminated the tooth top radial clearance of the body of bolt 1 internal and external threads fully, the locking of realization Full Thread FT, make fastening piece under the radial force effect, can not produce horizontal moving, simultaneously under the identical situation of axial force F z, the wedge shape inclined-plane produces than the big nearly 4 times normal pressure Fn of common standard screw thread to the screw 2 outside thread crests that cooperate, and the externally threaded cusp of the screw that makes cooperation produces the resiliently deformable of trace, thereby make also bearing load simultaneously of 60 ° of tooth form inclined-planes, increase the area of contact of helix, improved locking frictional force.

Most preferred embodiment of the present utility model is illustrated, and various variations or the remodeling made by those of ordinary skills can not break away from scope of the present utility model.

Claims (3)

1, the locking anticreep bolt of heterodont, comprise the body of bolt (1), the described body of bolt (1) body periphery is shaped on the internal thread tooth form body (1a) that uniformly-spaced is provided with, it is characterized in that: each thread profile body (1a) all has roof pressure face (1b) and moves back the flank of tooth (1c) in the described body of bolt (1), described roof pressure face (1b) is extended with a wedge shape inclined-plane (1d), and this wedge shape inclined-plane (1d) extends and intersect with the flank of tooth that moves back that is positioned at the adjacent internal thread tooth form body in upper end, and constitutes the thread groove (1e) of adaptive screw outside thread tooth; Described wedge shape inclined-plane (1d) and the screw thread of the described body of bolt (1) are screwed into direction and become α=22 ° to 27 ° angle, and the direction on this wedge shape inclined-plane (1d) and the described body of bolt (1) screw thread to be screwed into direction identical.

2, the locking anticreep bolt of heterodont according to claim 1 is characterized in that: described roof pressure face (1b) and the angle that moves back between the flank of tooth (1c) are 60 degree.

3, the locking anticreep bolt of heterodont according to claim 1 is characterized in that: the middle footpath of the described body of bolt (1) is provided with bigger than footpath in the common standard bolt according to the pitch structure, span is 0.1 millimeter to 1.0 millimeters.