CN203297282U - Eccentric type self-locking nut - Google Patents
Eccentric type self-locking nut Download PDFInfo
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- CN203297282U CN203297282U CN201320337244XU CN201320337244U CN203297282U CN 203297282 U CN203297282 U CN 203297282U CN 201320337244X U CN201320337244X U CN 201320337244XU CN 201320337244 U CN201320337244 U CN 201320337244U CN 203297282 U CN203297282 U CN 203297282U
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- frustum
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Abstract
Provided is an improved eccentric type self-locking nut. The function that a nut is prevented from being loosened under the working conditions that vibration frequency is high, vibration strength is high, and vibration cycle is long in the prior art is fundamentally achieved. The eccentric type self-locking nut comprises a lower body and an upper body, wherein an eccentric boss is arranged on the upper portion of the lower body, and an eccentric hole is formed in the lower portion of the lower body. The eccentric type self-locking nut is characterized in that the eccentric boss of the lower body and the eccentric hole in the upper body are tightly matched, connected and fixed through a thin-wall sleeve with a frustum, the outer diameter of the eccentric boss of the lower body is same as the inner diameter of the thin-wall sleeve with the frustum, the inner diameter of the eccentric hole in the upper body is same as the outer diameter of the thin-wall sleeve with the frustum, in an initial state, the axial center line, the thread center line of the upper body and the thread center line of the lower body are deviated on a same eccentric axis, and the axial initial distance is formed between the end portion of the upper body and the end portion of the lower body. The eccentric type self-locking nut is simple in machining process, reasonable in stress after being matched with a connecting bolt, and convenient to demount and mount just like a plain nut, can implement the tightening function by the utilization of the loose moment of the nut itself, and has the advantages that the anti-loose effect of the nut is remarkably improved and the nut is beneficially reused.
Description
Technical field
The utility model relates to the fastening piece that a kind of machinery scyewed joint is used, and particularly a kind of the cooperation with attachment bolt utilizes nut self loose moment to implement to mend tight locking Accentric self locking nut.It mainly is applicable to, and vibration frequency is high, ocsillator strenght is large, time of vibration is long, the vibration frequency vary within wide limits, and need to strictly prevent the important events of nut loosening.
Background technique
The bolt assembly that the fastening piece that common machinery scyewed joint is used consists of bolt, nut, spring washer etc., bolt generally rely on nut self locking.Wherein lock nut mainly contains following several: namely the anti-slow ring type lock nut of built-in nylon, built-in anti-slow steel-sheet type lock nut, built-in anti-slow coil spring formula lock nut, built-in anti-slow pin (ball) formula lock nut, change thread profile angie type lock nut, at sagittal plane, open anti-slow slot type lock nut, by screw thread punching distortion to increase nut and bolt friction torque formula lock nut etc.In addition, adopt the associating retention device that forms from external action to realize having of nut anti-looseness: to add spring washer locking, add locked spacer locking, utilize tackiness agent locking, in bolt, nut joint, rush the forms such as deformation point is locking.Above anti-loose method, cut both ways, but, under, the operating mode such as ocsillator strenght is large, the vibrational period is long high in vibration frequency, be difficult to meet locking requirement.
According to pertinent literature report, in order to address this problem, occurred that in recent years some utilize the locking structural design of double nut combination, as B. P. GB1547585, German patent DE 364066825, F.P. FR 1.217.394 and 744.039 etc.The outstanding problem of above-mentioned these technological schemes is to avoid being fixed on the generation of axial stress on bolt, and can not realize that combined type is locking, more can not realize utilizing nut self loose moment to implement nut and mend tight locking functions; In addition, European patent EP 0362132A1, Japan Patent 2003-42128A, double nut " axial distance " design is also disclosed, although avoided fixing the generation of axial stress on their bolt, but continue research and be somebody's turn to do the corresponding relation between " axial distance " and lead of screw thread, to how stoping dither, prevent from the locking solution that do not propose of nut self-excited vibration etc. from also proposing to utilize nut loosening moment to implement nut and mending tight locking scheme.The applicant once designed for the problems referred to above " Accentric self locking nut " that patent publication No. is CN1987133A, disclose and above nut body, assembled self-locking ring, and kept " axial distance " and lead of screw thread Relations Among to carry out the solution to nut anti-looseness.But because its processing technology difficulty is larger, distribution of force is also undesirable, and anti-loosing effect is not use up people's will yet, can't solve nut combinations, utilize nut loosening moment to implement to mend locking this difficult problem of jack panel.
The model utility content
The purpose of this utility model is to provide a kind of Modified eccentric formula self-locking nut, the problems such as the operating mode lower nuts such as that it has solved fundamentally that prior art exists is in vibration frequency high, ocsillator strenght is large, the vibrational period is long are locking, its processing technology is simple, reasonable stress after coordinating with attachment bolt, and easy accessibility the same as plain nut, and utilize nut self loose moment implement to mend tight function, the advantage such as have remarkable enhancing nut anti-looseness effect and be more conducive to reuse.
the technological scheme that the utility model adopts is: this Accentric self locking nut comprises that top is provided with the lower body of eccentric boss, bottom is provided with the upper body of eccentric opening, on, lower body is identical with the internal thread that attachment bolt coordinates, and on same longitudinal center line, its technological points is: between the eccentric boss of described lower body and upper body eccentric opening, by band frustum thin walled cylinder body, closely cooperate and be connected and fixed, the external diameter of the eccentric boss of lower body is identical with the internal diameter with the frustum thin walled cylinder body, the internal diameter of upper body eccentric opening is identical with the external diameter with the frustum thin walled cylinder body, and three's original state, longitudinal center line and upper, thread center's line of lower body departs from same eccentric axis, axial initial distance between the eccentric boss of eccentric opening end, upper body and lower body end, more than or equal to 1/2nd pitch, on, axial initial distance between the lower body peripheral end, be equal to or less than 1/2nd pitch.
Between described frustum with frustum thin walled cylinder body end and nut upper body eccentric opening, be provided with the damping collar of being made by nonmetallic material or metallic material.
Described band frustum thin walled cylinder body adopts metallic material or nonmetallic material to make integrated type, split type or form fabricated structure by at least two sleeves.
The mark of upper and lower mutual correspondence is set at described upper and lower body outer circumferential face.
advantage and the good effect that the utlity model has are: because the utility model improves on the basis of fully studying existing nut anti-looseness principle, proposition is between the eccentric boss of lower body and upper body eccentric opening, by band frustum thin walled cylinder body, closely cooperate and be connected and fixed, and three's original state, longitudinal center line and upper, thread center's line of lower body departs from same eccentric axis, while implementing nut anti-looseness locking, the relative lower body in upper body is turned an angle along screwing the nut direction, cause the relative lower body tapped hole in upper body to produce eccentric, attachment bolt is produced to radial pressure, form radially locking friction torque, because of between the eccentric boss of eccentric opening end, upper body and lower body end axially initial distance more than or equal to 1/2nd pitch, on, between the lower body peripheral end, axial initial distance is equal to or less than 1/2nd pitch, when therefore rotate relative to lower body upper body, axial distance between the eccentric boss end of lower body and eccentric opening end, upper body reduces, cause the distortion of band frustum thin walled cylinder body frustum position, attachment bolt is produced to radial pressure, the formation combined type is locking, so its processing technology is simple, reasonable stress after coordinating with bolt, and easy accessibility the same as plain nut, after implementing locking, utilize nut lower body loose moment to mend jack panel locking, and under the synergy of band frustum thin walled cylinder body, realize the combined type locking functions.Therefore, the problems such as the operating mode lower nuts such as that it has solved fundamentally that prior art exists is in vibration frequency high, ocsillator strenght is large, the vibrational period is long are locking, the utility model utilizes nut self loose moment to implement to mend tightly, and the remarkable enhancing nut anti-looseness effect that has is considerably beyond current any lock nut.
In addition, if with between the frustum end of frustum thin walled cylinder body and nut upper body eccentric opening, the damping collar being set, utilize so all right absorbing high-frequency vibrational energy of the damping collar, obstruction to the dither of lower body transmits to upper body, prevent that upper body is loosening because self-excited vibration causes, further guarantee locking reliable.Thereby make the utility model be more suitable for that ocsillator strenght is large, time of vibration is long, vibration frequency is high, the vibration frequency vary within wide limits, and need to strictly prevent the important events such as nut loosening.
For convenient disassembly, can also the mark of upper and lower mutual correspondence be set at the upper and lower body outer circumferential face, more be conducive to realize reusing.Simultaneously, during because of operation, do not need special tool, the outside size that connects meets NBS fully, therefore the utility model is easily realized standardization, seriation, large-scale industrial production.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further described.
Fig. 1 is a kind of concrete structure schematic diagram of the present utility model;
Fig. 2 is the sectional view of Fig. 1 along the A-A line;
Fig. 3 is a kind of use view of the utility model;
Force principle figure when Fig. 4 is the utility model use.
Sequence number explanation in figure: axially axial initial distance, 8 common circular washers, 9 coupled, 10 attachment bolts between initial distance, 6 gauge points, 7 upper and lower body peripheral ends between 1 lower body, 2 upper bodies, the 3 damping collars, 4 band frustum thin walled cylinder bodies, 5 upper body eccentric openings and the eccentric boss of lower body end.
Embodiment
According to Fig. 1～Fig. 4, describe concrete structure of the present utility model in detail.This Accentric self locking nut comprises that top is provided with the lower body 1 of eccentric boss, and bottom is provided with the upper body 2 of eccentric opening, and upper and lower body 2,1 is identical with the internal thread that attachment bolt 10 coordinates, and on same longitudinal center line.Wherein, between the eccentric opening of the eccentric boss of lower body 1 and upper body 2, by band frustum thin walled cylinder body 4, closely cooperate and be connected and fixed.For the needs of the friction factor size that meets different resiliently deformables and formation, band frustum thin walled cylinder body 4 can adopt metallic material or nonmetallic material make monolithic construction, split-type structural or form fabricated structure by at least two sleeves.The above-mentioned Main Function that is connected and fixed has 2 points: the one, produce certain initial frictional, and between the upper and lower body 2,1 that guarantees original state before use, not relatively move, the convenient use; The 2nd, while implementing self-locking, under the throw of eccentric effect, produce friction torque MF2.The external diameter of lower body 1 eccentric boss is identical with the internal diameter with frustum thin walled cylinder body 4, the internal diameter of upper body 2 eccentric openings is identical with the external diameter with frustum thin walled cylinder body 4, and three's original state, thread center's line of longitudinal center line and upper and lower body 2,1 departs from same eccentric axis.At this moment, the utility model and plain nut are just the same, can the attachment bolt 10 of free-hand light screw-in same size on.Should make between 2 eccentric opening ends, upper body and the eccentric boss of lower body 1 end that axially initial distance 5 is more than or equal to 1/2nd pitch (or lead of screw thread), between the peripheral end of upper body 2 and lower body 1, axial initial distance 7 is equal to or less than 1/2nd pitch (or lead of screw thread).Its objective is and partly provide enough deformation spaces for the frustum with frustum thin walled cylinder body 4; Simultaneously, prevent that nut upper body 2, lower body 1 from occurring top when implementing locking, and make attachment bolt 10 produce tensile stress.Because inside, outer end between upper and lower body 2,1 are provided with axial initial distance, so, when implementing locking, can not increase the axial stress of attachment bolt 10.Guarantee simultaneously when implementing self-locking, by reducing axial initial distance 5 between the eccentric boss of upper body eccentric opening and lower body end, make, with the frustum of frustum thin walled cylinder body 4, resiliently deformable partly occurs; At upper body 2 eccentric openings under the throw of eccentric effect, the eccentric boss of lower body 1 and the friction torque that produces between with frustum thin walled cylinder body 4 less than the friction torque between upper body 2 and attachment bolt 10, lower body 1 and attachment bolt 10, with this, realize utilizing nut loosening moment to implement nut and mend tight locking functions.
With between the frustum end of frustum thin walled cylinder body 4 and 2 eccentric opening ends, nut upper body, being provided with the damping collar 3 of being made by nonmetallic material or metallic material.Utilize the damping collar 3 can the absorbing high-frequency vibrational energy, hinder dither to lower body 12 to transmit to upper body, prevent that upper body 2 is loosening because self-excited vibration causes, further guarantee locking reliable.Thereby make the utility model be more suitable for that ocsillator strenght is large, time of vibration is long, vibration frequency is high, the vibration frequency vary within wide limits, and need to strictly prevent the important events such as nut loosening.Can also guarantee simultaneously when implementing self-locking, further reduce axial initial distance 5 between 2 eccentric opening ends, upper body and the eccentric boss of lower body 1 end, increase the elastic deformation amount.
While because of relative lower body 1 Rotate 180 in upper body 2, spending, there will be the throw of eccentric maximum value, maximum coupling mechanism force namely appears, so another purpose of selecting upper body 2, the axial initial distance 7 of lower body 1 peripheral end to be equal to or less than 1/2nd pitch (or lead of screw thread) is to prevent to surmount Rotate 180 degree phenomenon, to guarantee that maximum eccentricity can not reduce because angle of swing increases, simultaneously, reduce to greatest extent the nut free height.
As shown in Figure 3, be a kind of use view of the utility model, Accentric self locking nut connects connected piece 9 together by attachment bolt 10, common circular washer 8, when relative lower body 1 edge screws nut direction rotation upper body 2, self-locking just occurs.
As shown in Figure 4, Force principle figure while being the utility model use, when relative lower body 1 edge screws the 2 generation self-locking of nut direction rotation upper body, under the throw of eccentric effect, the radial pressure that 10 generations of 1 pair of attachment bolt of lower body are set is F1, the radial pressure that 2 pairs of upper bodies attachment bolt 10 produces is F3, and in upper body 2, lower body 1, with frustum thin walled cylinder body 4 threes' joint, to the radial effect power that thin walled cylinder body 4 produces, be that F2, reaction force are F2 '.Three groups of power, under the throw of eccentric effect, have met the representation " MF1 ﹥ MF3 ﹥ MF2(or MF1=MF3 ﹥ MF2) " of friction torque between upper and lower body 2,1.Under the vibration force effect, at first vibration energy causes lower body 1 loosening, make nut rotate an angle to unclamping direction, be subjected to " MF1 ﹥ MF3 ﹥ MF2(or MF1=MF3 ﹥ MF2) " the inequality effect, lower body 1 can not, by its eccentric boss and with the friction torque between frustum thin walled cylinder body 4, drive upper body 2 by upper body 2 eccentric openings and rotate together.The loose moment that produces when vibrational energy is during greater than the initial locking pre-fastening moment of nut, lower body 1 can be in the situation that upper body 2 be motionless, loosening angle, namely be equivalent to lower body 1 not moving, upper body 2 has been rotated an angle relative to lower body 1 along screwing the nut direction, the relative offset of upper and lower body 2,1 interior threaded hole is increased, causes locking friction torque to increase, until with the loose moment balance.
This nut in use, at first according to a conventional method by nut screwing clamping, when needs enforcement is locking, upper body 2 is rotated to an angle (angle is larger, and throw of eccentric is larger, and initial coupling mechanism force is just larger) relative to lower body 1 along screwing the nut direction, cause relative lower body 1 tapped hole in upper body 2 to produce eccentric, attachment bolt 10 is produced to radial pressure F1, F3, form locking friction torque, thereby complete, utilize nut loosening moment to implement the tight locking functions of nut benefit.Simultaneously, the axial initial distance 5 in the eccentric boss of lower body 1 between the interior all ends of all ends and upper body 2 eccentric openings reduces, and causes band frustum thin walled cylinder body 4 frustums and 3 distortion of the out-damping collar, and attachment bolt 10 is produced to radial pressures, forms the combined type locking functions.
The gauge point 6 of upper and lower mutual correspondence is set at the upper and lower body outer circumferential face.When needs dismounting nut, the relative lower body 1 in upper body 2 is gone back to initial position along unclamping the nut direction, make upper and lower gauge point 6(or the mark line of upper and lower body 2,1 outer circumferential face corresponding part) alignment, at this moment, the interior threaded hole of upper and lower body 2,1 recovers with one heart, lose the attachment bolt radial pressure, simultaneously, frustum part and the damping collar 3 with frustum thin walled cylinder body 4, return to original position, lose axial pressure, remove combined type locking, along unclamping the nut direction, rotate simultaneously upper and lower body 2,1 and can unload lower nut.Due in whole operating process, inside and outside connection screw thread is in identical state all the time, so, to attachment bolt 10, can not produce injury effect.
Claims (4)
1. Accentric self locking nut, comprise that top is provided with the lower body of eccentric boss, bottom is provided with the upper body of eccentric opening, on, lower body is identical with the internal thread that attachment bolt coordinates, and on same longitudinal center line, it is characterized in that: between the eccentric boss of described lower body and upper body eccentric opening, by band frustum thin walled cylinder body, closely cooperate and be connected and fixed, the external diameter of the eccentric boss of lower body is identical with the internal diameter with the frustum thin walled cylinder body, the internal diameter of upper body eccentric opening is identical with the external diameter with the frustum thin walled cylinder body, and three's original state, longitudinal center line and upper, thread center's line of lower body departs from same eccentric axis, between the eccentric boss of eccentric opening end, upper body and lower body end, axial initial distance is more than or equal to 1/2nd pitch, on, between the lower body peripheral end, axial initial distance is equal to or less than 1/2nd pitch.
2. Accentric self locking nut according to claim 1, is characterized in that: between described frustum with frustum thin walled cylinder body end and nut upper body eccentric opening, be provided with the damping collar of being made by nonmetallic material or metallic material.
3. Accentric self locking nut according to claim 1 is characterized in that: described band frustum thin walled cylinder body adopts metallic material or nonmetallic material to make integrated type, split type or form fabricated structure by at least two sleeves.
4. Accentric self locking nut according to claim 1, is characterized in that: the mark that upper and lower mutual correspondence is set at described upper and lower body outer circumferential face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320337244XU CN203297282U (en) | 2013-06-13 | 2013-06-13 | Eccentric type self-locking nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320337244XU CN203297282U (en) | 2013-06-13 | 2013-06-13 | Eccentric type self-locking nut |
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| Publication Number | Publication Date |
|---|---|
| CN203297282U true CN203297282U (en) | 2013-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320337244XU Expired - Fee Related CN203297282U (en) | 2013-06-13 | 2013-06-13 | Eccentric type self-locking nut |
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| CN (1) | CN203297282U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277392A (en) * | 2013-06-13 | 2013-09-04 | 魏民 | Eccentric type self-locking nut |
| CN108006048A (en) * | 2017-11-30 | 2018-05-08 | 安徽西马新能源技术有限公司 | A kind of compound nut structure |
-
2013
- 2013-06-13 CN CN201320337244XU patent/CN203297282U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277392A (en) * | 2013-06-13 | 2013-09-04 | 魏民 | Eccentric type self-locking nut |
| CN103277392B (en) * | 2013-06-13 | 2015-06-17 | 魏民 | Eccentric type self-locking nut |
| CN108006048A (en) * | 2017-11-30 | 2018-05-08 | 安徽西马新能源技术有限公司 | A kind of compound nut structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131120 Termination date: 20150613 |
|
| EXPY | Termination of patent right or utility model |