CN204041683U

CN204041683U - A kind of self-locking screw

Info

Publication number: CN204041683U
Application number: CN201420464373.XU
Authority: CN
Inventors: 吴国民
Original assignee: ESSENCE ELECTROMECHANICAL MANUFACTURING (HANGZHOU) Co Ltd
Current assignee: Hangzhou tongna Hardware Manufacturing Co. Ltd.
Priority date: 2014-08-16
Filing date: 2014-08-16
Publication date: 2014-12-24
Anticipated expiration: 2024-08-16

Abstract

The utility model discloses a kind of self-locking screw, aim to provide the self-locking screw that a kind of locked effect is strong, its drip irrigation device is a kind of self-locking screw, comprise bolt body, bullet pad and plain cushion, the outer peripheral surface of described bullet pad has middle tooth, described plain cushion is provided with the low groove that radius is greater than the circle of bullet pad radius, described low groove inner peripheral surface has lower tooth, described bolt body has the upper groove that radius is greater than the circle of bullet pad radius in the connecting part of screw thread and nut, described upper groove inner peripheral surface has tooth, the utility model is applicable to heavy duty equipment, household electric appliance, the fields such as the traffic tool.

Description

A kind of self-locking screw

Technical field

The utility model relates to a kind of bolt production technical field, and more particularly, it relates to the strong self-locking screw of a kind of locked effect.

Background technique

The fastening piece of screw bolt and nut composition is widely used on numerous occasions such as science and technology, production, processing and test and machinery and instrument and apparatus.Common bolt does not generally all have auto-lock function, is used in general occasion and substantially can meets usage requirement.But be used in the occasion that some vibrations are larger, due to vibration, can bolt looseness be caused.Especially, on the vehicle travelled or dynamic instrument and apparatus, this loosening the lighter not easily discovered affects normally carrying out of work, and severe one can lead to a disaster.So in some special occasions, the self-locking screw preventing from loosening must be used.

At present, application number is that the Chinese patent of CN201110103378.0 discloses a kind of self-locking screw, comprise the screw rod with nut and nut, described nut and screw rod are respectively arranged with the internal and external threads complemented one another, one end of described nut is also connected with lock pad, described lock pad is provided with the internal thread complemented one another with external thread of screw, the local notch opened inside and outside described lock pad circumference is provided with.

Although this self-locking screw structure is simple, cost is low, easy to manufacture, locked effect is undesirable, and bulk strength is not enough.

Model utility content

For the deficiency that prior art exists, the purpose of this utility model is the self-locking screw providing a kind of locked effect strong.

For achieving the above object, the utility model provides following technological scheme: a kind of self-locking screw, comprise bolt body, bullet pad and plain cushion, the outer peripheral surface of described bullet pad has middle tooth, described plain cushion has the low groove that radius is greater than the circle of bullet pad radius towards bullet pad side, the center of circle of described low groove is on bolt body axis, described low groove inner peripheral surface has lower tooth, described bolt body has the upper groove that radius is greater than the circle of bullet pad radius in the connecting part of screw thread and nut, the center of circle of described upper groove is on bolt body axis, described upper groove inner peripheral surface has tooth.

By adopting technique scheme, with to engage each other between tooth and the tooth punching of upper groove and low groove in bullet pad outer peripheral surface thus thorough locked screw rotates, the power that bolt body is subject to when being given a shock is not enough to the resistance of tooth and upper and lower tooth punching in breakthrough, avoid bolt because loosening of causing of vibrations or mechanical stress, locked effect is strong, and does not need extra locked assembly, improve stock utilization, during use, plain cushion is fixed on workpiece, then bullet pad and bolt body are installed, easy to operate.

The utility model is set to further: described plain cushion is square perpendicular to the cross section of bolt body axis.

By adopting technique scheme, conveniently on workpiece, fix plain cushion locked with auxiliary bolt, square plain cushion uniform force is not fragile.

The utility model is set to further: described plain cushion is triangle perpendicular to the cross section of bolt body axis.

By adopting technique scheme, conveniently on workpiece, fix plain cushion locked with auxiliary bolt, triangular planar cushion material utilization ratio is higher cost-saving.

The utility model is set to further: described bullet pad comprises upper tip and lower end, described upper tip and lower end are equipped with inclined-plane, the inclined-plane of described upper tip and lower end is parallel to each other, the inclined-plane of projection and lower end that described upper tip inclined-plane prolongs bolt body axis coincides, and the inclined-plane of described upper-end surface and the inclined-plane of lower end surface are oppositely arranged.

By adopting technique scheme, make bullet pad when by compression, can decompose downforce by inclined-plane is lateral expansion force, thus increases bullet pad radius by a small margin, increases the mesh degree with upper groove and low groove, improves locked dynamics, strengthens locking performance.

The utility model is set to further: the elastic material winding that described bullet pad is greater than upper groove and low groove degree of depth sum by thickness forms.

By adopting technique scheme, bullet pad is made to be slightly thicker than the degree of depth sum of upper groove and low groove, the locking dynamics avoiding the bad connection of tooth and upper tooth and lower tooth in bullet pad to cause is not enough, nut body on bolt can compacting bullet pad after tightening, thus the pressure increased bullet pad, increase the resistance after gears meshing, prevent from getting loose.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of self-locking screw embodiment one of the utility model;

Fig. 2 is the structure schematic diagram of embodiment one;

Fig. 3 is the plan view of embodiment one;

Fig. 4 is the plan view of embodiment two.

Reference character: 1, bolt body; 2, plain cushion; 3, bullet pad; 11, upper groove; 12, upper tooth; 21, low groove; 22, lower tooth; 31, upper tip; 32, lower end; 33, middle tooth.

Embodiment

Referring to figs. 1 through Fig. 4, a kind of self-locking screw embodiment of the utility model is described further.

As shown in Figures 1 to 4, a kind of self-locking screw, the junction of bolt body 1 nut and screw thread is provided with circular upper groove 11, the outer peripheral surface of upper groove 11 has tooth 12, upper groove 11 degree of depth is less than the thickness of half bullet pad 3 individual pen, and bolt body 1 combinationally uses with bullet pad 3 and plain cushion 2, and the cylindrical spring that bullet pad 3 is 1.05 ~ 1.15 by the number of turns is formed, its sectional shape is square, and bullet pad 3 outer peripheral surface has middle tooth 33 and the radius of bullet pad 3 is slightly less than upper groove 11 radius.

Bullet pad 3 is provided with upper tip 31 and lower end 32, described upper tip 31 and lower end 32 are equipped with inclined-plane, the inclined-plane of described upper tip 31 and lower end 32 is parallel to each other, the inclined-plane of projection and lower end 32 that described upper tip 31 inclined-plane prolongs bolt body 1 axis coincides, the inclined-plane of described upper-end surface and the inclined-plane of lower end surface are oppositely arranged, and can relative sliding after conflict.

Described plain cushion 2 outside dimension is square or triangle, plain cushion 2 central authorities are provided with circular low groove 21, described low groove 21 radius is slightly larger than bullet pad 3 radius, lower tooth 22 is had in described low groove 21, low groove 21 degree of depth is less than the thickness of half bullet pad 3 individual pen, and described plain cushion 2 also can setting one-body molded with workpiece to be processed.

When using the utility model, first plain cushion 2 is fixed on workpiece to be processed tapped hole surface, then bolt body 1 is connected with tapped hole with plain cushion 2 through bullet pad 3, after bolt body 1 is tightened, upper groove 11 extrudes bullet pad 3, upper tip 31 and the lower end 32 of bullet pad 3 are conflicted mutually, by the inclined-plane of upper tip 31 and lower end 32, extruding force is decomposed into horizontal expansionary force, the radius of bullet pad 3 is increased gradually, the middle tooth 33 of bullet pad 3 outer peripheral surface engages with upper tooth 12 and lower tooth 22 gradually because of the increase of bullet pad 3 radius subsequently, great rotational resistance is formed after engagement, now bolt closely cooperates with tapped hole, and plain cushion 2 and workpiece to be processed are for being fixedly connected with, by lower tooth 22, middle tooth 33, engaging each other of upper tooth 12 stops bolt body 1 to get loose because of vibrations or mechanical stress, reach stronger self-locking effect.

Square plain cushion 2 uniform force is not fragile, reduce maintenance needs, increase working life, triangle plain cushion 2 stock utilization height is relatively cost-saving, easy for installation and the good fixing effect of plain cushion 2, the middle tooth 33 of bullet pad 3 cooperatively interacts with upper tooth 12 and lower tooth 22, the upper tip 31 of bullet pad 3 and lower end 32 make bullet pad 3 expand increases engagement degree, improve locked dynamics, improve self-locking property, upper groove 11 and low groove 21 degree of depth sum are less than the thickness of bullet pad 3 individual pen, improve squeezing effect, avoid and to leave the extruding force that space causes between bullet pad 3 and bolt body 1 or plain cushion 2 and be not enough to make bullet pad 3 expand situation completely, improve tooth 12, middle tooth 33, the cooperate degree of lower tooth 22, strengthen locked effect, prevent from getting loose.

Tight a bolt after body 1, bullet pad 3 extrudes expansion makes tooth 12, middle tooth 33 and lower tooth 22 engage each other, continuing the increase dynamics of tightening can make tooth 12, middle tooth 33 and lower tooth 22 slide, send the sound of click click, effect and the dynamics that operator judge screw tightening can be helped according to the size of sliding tooth sound and number of times, simultaneously when bolt body causes getting loose because of great stress, also kaka sound can be sent, alert maintenance lathe or equipment, avoid causing accident because bolt gets loose, improve Safety performance.

The above makes preferred implementation of the present utility model, and under not departing from the prerequisite of the utility model principle for the person of ordinary skill of the art, can also make some modification and improvement, these also should be considered as protection domain of the present utility model.

Claims

1. a self-locking screw, comprise bolt body, bullet pad and plain cushion, it is characterized in that: the outer peripheral surface of described bullet pad has middle tooth, described plain cushion has the low groove that radius is greater than the circle of bullet pad radius towards bullet pad side, the center of circle of described low groove is on bolt body axis, described low groove inner peripheral surface has lower tooth, described bolt body has the upper groove that radius is greater than the circle of bullet pad radius in the connecting part of screw thread and nut, the center of circle of described upper groove is on bolt body axis, and described upper groove inner peripheral surface has tooth.

2. a kind of self-locking screw according to claim 1, is characterized in that: described plain cushion is square perpendicular to the cross section of bolt body axis.

3. a kind of self-locking screw according to claim 1, is characterized in that: described plain cushion is triangle perpendicular to the cross section of bolt body axis.

4. a kind of self-locking screw according to Claims 2 or 3, it is characterized in that: described bullet pad comprises upper tip and lower end, described upper tip and lower end are equipped with inclined-plane, the inclined-plane of described upper tip and lower end is parallel to each other, the inclined-plane of projection and lower end that described upper tip inclined-plane prolongs bolt body axis coincides, and the inclined-plane of described upper-end surface and the inclined-plane of lower end surface are oppositely arranged.

5. a kind of self-locking screw according to claim 4, is characterized in that: the elastic material winding that described bullet pad is greater than upper groove and low groove degree of depth sum by thickness forms.