CN101387335A - Tensioner - Google Patents
Tensioner Download PDFInfo
- Publication number
- CN101387335A CN101387335A CNA2008102250063A CN200810225006A CN101387335A CN 101387335 A CN101387335 A CN 101387335A CN A2008102250063 A CNA2008102250063 A CN A2008102250063A CN 200810225006 A CN200810225006 A CN 200810225006A CN 101387335 A CN101387335 A CN 101387335A
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- China
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- nutted rod
- tensioning
- stretcher
- wedge slot
- steel ball
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Abstract
The invention discloses a tensioner, which comprises a tensioner body with a guide hole as well as a tensioning rod and a tensioning spring which are slidingly arranged in the guide hole, wherein one end of the tensioner body is provided with a wedge-shaped groove, and a locking ball which contacts the inner wall of the wedge-shaped groove and the outer surface of the tensioning rod is arranged in the wedge-shaped groove and is provided with a limiting plate used to press the locking ball. The tensioner can realize the automatic stepless tensioning of the tensioning rod; at the same time, the tensioner realizes the unidirectional locking function of the tensioning rod, namely the tensioning rod can extend but can not retract, which improves the sensitivity, the stability and the reliability of the tensioning of the tensioner, and can meet the demands for tensioning various chains.
Description
Technical field
The present invention relates to a kind of tension structure of stretcher, particularly relate to a kind of stretcher that chain does not have the rank tensioning that is used for, belong to field of mechanical technique.
Background technique
Chain need install additional usually in the course of the work and step up the tensioning that device is realized chain, chain occurs after avoiding that chain is long-time and using and crosses pine or long phenomenon, to alleviate the noise of motor, improves the precision and the life-span of motor operation.
Stretcher of the prior art generally comprises tensioner body, nutted rod and tension spring, and nutted rod is arranged in tensioner body, and the lower end contacts with tension spring.Wherein the tooth of some is arranged on the nutted rod surface, under the elastic force effect of tension spring with tensioner body on the tooth engagement driving that is provided with, nutted rod is stretched out along tension direction, the front end of nutted rod contacts with chain, apply tension force on chain, act on the reaction force on the nutted rod and be applied to nutted rod up to chain and impel it to reach balance along the active force that tension direction puts in, then the engagement driving of tooth stops, nutted rod is realized the tensioning to chain, guarantees that chain is in tensioning state.In addition, the elastic force of tension spring as required the chain of tensioning concrete needs and set, different chains can be selected the mounting point of different flexible tension springs and tension spring for use, with the needs of the tensioning of satisfying different chains.
The inventor finds that in realizing process of the present invention there is following defective at least in prior art, on the one hand because prior art adopts the engagement driving of tooth to make nutted rod stretch out the tensioning of realization to chain, the minimum range of nutted rod tensioning is two distances between adjacent teeth, when tensioning distance less than between two adjacent teeth apart from the time, nutted rod is failure to actuate, therefore, tensioning sensitivity is relatively poor, can't satisfy the needs of the motor that tensioning sensitivity is strict with; On the other hand, because the minimum tensioning process of nutted rod of the prior art, it is the minimum outreach of nutted rod, the distance that depends on adjacent two between cog on the nutted rod, therefore, nutted rod can be in its minimum tensioning Process Extents axial motion, can't realize the purpose of complete tensioning, influenced the stability and the reliability of tensioning.
Summary of the invention
The purpose of this invention is to provide a kind of stretcher, can effectively overcome defective of the prior art, realize nonrated auto-tensioning, can not occur technical problem simultaneously to the axial motion of non-tension direction.
For achieving the above object, the invention provides a kind of stretcher, comprise the tensioner body that is provided with pilot hole, and be slidedly arranged on nutted rod and tension spring in the described pilot hole, described tensioner body one end offers wedge slot, be provided with the lock ball that contacts with the nutted rod outer surface with the wedge slot inwall in the described wedge slot, described lock ball is provided with presses the limiting board of establishing described lock ball.
Wherein, also be provided with elastic member between described limiting board and the lock ball.Described elastic member is a limit spring.Described limiting board lower surface is provided with directional post, and described limit spring is sheathed on the described directional post.
Further, described wedge slot is 3～6.Described wedge slot is evenly to be provided with.
As shown from the above technical solution, the present invention is by being provided with wedge slot on tensioner body, and be provided with lock ball in the wedge slot, realized the no rank auto-tensioning of nutted rod on the one hand by the rolling friction between nutted rod and the lock ball, the tensioning sensitivity that has improved stretcher; On the other hand, support force by sliding friction between nutted rod and the lock ball and lock ball, realize the one-way locking function of nutted rod, be smoothly unidirectional stretching out of nutted rod, and can't bounce back, guarantee the stability and the reliability of stretcher tensioning, satisfied the needs of the tensioning of various chains.
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is stretcher embodiment's one of the present invention structural representation;
Fig. 2 is stretcher embodiment's two of the present invention structural representation;
Fig. 3 is stretcher embodiment's two of the present invention perspective view;
Fig. 4 is the structural representation of wedge slot among the stretcher embodiment of the present invention;
Fig. 5 is the concrete scheme of installation of using of stretcher embodiment of the present invention.
Embodiment
As shown in Figure 1, be stretcher embodiment's one of the present invention structural representation.The present embodiment stretcher comprises tensioner body 1, nutted rod 2 and tension spring 3; Tensioner body 1 is a Cylindrical object, and offers pilot hole along axial direction, and simultaneously the upper end of tensioner body 1 is provided with up big and down small wedge slot 4, and wedge slot 4 is coaxial and be interconnected with pilot hole; Tension spring 3 and nutted rod 2 are arranged in the pilot hole, wherein, the lower end of the pilot hole of tensioner body 1 is stretched out in the lower end of tension spring 3, affixed with spring fixed seat 9, the lower end of nutted rod 2 is connected with the upper end of tension spring 3, the upper end of the pilot hole of tensioner body 1 is stretched out in the upper end of nutted rod 2, is used in use realizing the tensioning to chain; Be provided with at least three lock balls between the outer surface of the inwall of wedge slot 4 and nutted rod 2, lock ball described in the present embodiment is locking steel ball 5, and the top that is positioned at least three locking steel balls 5 of wedge slot 4 also is provided with presses the limiting board 6 of establishing locking steel ball 5.Wherein, the tension direction a of the opening direction of wedge slot 4 and nutted rod 2 in the same way, locking steel ball 5 contacts with the inwall of wedge slot 4 and the outer surface of nutted rod 2 simultaneously, limiting board 6 can adopt fixed forms such as position limit pin, screw thread or back-up ring to be installed in the wedge slot 4, and its lower surface contacts with locking steel ball 5.
The embodiment of the invention can realize the no rank tensioning of nutted rod 2, and promptly nutted rod 2 can smooth motion under the effect of the elastic force of tension spring 3, realizes the tensioning to chain.Particularly, in no rank tensioning process, under the bigger elastic force effect of tension spring 3, nutted rod 2 moves upward, and promptly stretches out to tension direction a from tensioner body 1; At this moment, since locking steel ball 5 respectively with the inwall of wedge slot 4, the outer surface of nutted rod 2 contacts with the lower surface of limiting board 6, therefore moving upward of nutted rod 2 rolled locking steel ball 5, between nutted rod 2 and locking steel ball 5, form rolling friction, nutted rod 2 can move smoothly to tension direction a under the acting in conjunction of the elastic force of tension spring 3 and this force of rolling friction, the distance that puts in of nutted rod is nonrated putting in, the minimum tensioning process that is nutted rod can be approximately 0, act on the elastic force and the rolling friction equilibrium of forces of the reaction force and the tension spring 3 of nutted rod up to chain, then nutted rod stops to put in automatically, promptly stops tensioning.Present embodiment has improved the tensioning sensitivity of stretcher, has satisfied the needs that tensioning sensitivity had strict demand.In addition, present embodiment nutted rod 2 also can limit the retraction of nutted rod.Particularly, because the phenomenons such as vibration that the chain movement process occurs, can apply a reaction force to nutted rod 2, under the effect of this reaction force, the trend of the oriented retraction direction b motion of nutted rod 2 meetings, when retraction trend appears in the reaction force that is subjected to chain when nutted rod 2, locking steel ball 5 moves downward the trend that downward rolling will be arranged under the drive of trend at nutted rod 2, because wedge slot 4 is up big and down small shape, make the distance between the outer surface of the inwall of the wedge slot 4 of retraction direction b and nutted rod 2 more and more littler, therefore stoped the downward rolling of locking steel ball 5, when nutted rod 2 moves downward, make between locking steel ball 5 and the nutted rod 2 and not only form sliding friction, and make locking steel ball 5 apply support force upwards to nutted rod 2, the support force that nutted rod 2 provides at locking steel ball 5, under the effect of the elastic force that force of sliding friction between locking steel ball 5 and the nutted rod 2 and tension spring 3 provide, to be in locking state, stoped the retracting motion of nutted rod 2 to retraction direction b, be that nutted rod has the one-way locking function, the nutted rod of present embodiment can smoothly be stretched out to tension direction a, and the restriction nutted rod bounces back to retraction direction b, make nutted rod to withdraw, thereby guaranteed the stability and the reliability of stretcher tensioning, satisfied the needs of various chains tensioning stability.
Also can be provided with the mounting hole that is used to be installed in other mechanisms such as motor on the tensioner body in the present embodiment, be convenient to installing and fixing of stretcher.The present embodiment stretcher in actual applications, the elastic force of tension spring and the mounting point of tension spring can be according to the needs of the tension force of the chain for the treatment of tensioning and relative set, if chain needs bigger tension force, what then the elastic force of tension spring can be provided with is big, in the practical application, can set according to concrete needs.Same, the reaction force of the maximum that may apply nutted rod that the gradient of wedge slot inwall also can occur according to the tension force of chain and chain is provided with, and guarantees the one-way locking function of nutted rod.
Present embodiment is by being provided with wedge slot on tensioner body, and is provided with the locking steel ball in the wedge slot, on the one hand by nutted rod with lock rolling friction between the steel ball and realized the no rank auto-tensioning of nutted rod, the tensioning sensitivity that has improved stretcher; On the other hand, support force by sliding friction between nutted rod and the locking steel ball and locking steel ball, realize the one-way locking function of nutted rod, be smoothly unidirectional stretching out of nutted rod, and can't bounce back, guarantee the stability and the reliability of stretcher tensioning, satisfied the needs of the tensioning of various chains.
As shown in Figure 2, be stretcher embodiment's two of the present invention structural representation, as shown in Figure 3, be stretcher embodiment's two of the present invention perspective view.The present embodiment stretcher comprises tensioner body 1, nutted rod 2 and tension spring 3; Tensioner body 1 is a Cylindrical object, and offers pilot hole along axial direction, and simultaneously the upper end of tensioner body 1 is provided with up big and down small wedge slot 4, and wedge slot 4 is coaxial and be interconnected with pilot hole; Tension spring 3 and nutted rod 2 are arranged in the pilot hole, wherein, the lower end of the pilot hole of tensioner body 1 is stretched out in the lower end of tension spring 3, affixed with spring fixed seat 9, the lower end of nutted rod 2 is connected with the upper end of tension spring 3, the upper end of the pilot hole of tensioner body 1 is stretched out in the upper end of nutted rod 2, is used in use realizing the tensioning to chain; Be provided with at least three locking steel balls 5 between the outer surface of the inwall of wedge slot 4 and nutted rod 2, the top that is positioned at least three locking steel balls 5 of wedge slot 4 also is provided with limit spring 7, and limit spring 7 tops are provided with the limiting board 6 that is pressed on the limit spring 7.Wherein, the tension direction a of the opening direction of wedge slot 4 and nutted rod 2 in the same way, locking steel ball 5 contacts with the inwall of wedge slot 4 and the outer surface of nutted rod 2 simultaneously, limiting board 6 can adopt fixed forms such as position limit pin, screw thread or back-up ring to be installed in the wedge slot 4, and its lower surface is pressed on the limit spring 7, makes limit spring 7 be in compressive state.
In the present embodiment, also can be provided with the directional post corresponding 8 on the limiting board 6 with the position of limit spring 7, and limit spring 7 is set on the directional post 8, to guarantee that limit spring 7 acts on the elastic force direction of locking steel ball 5, guarantee the one-way locking function of nutted rod 2, guaranteed the precision of the work of stretcher tensioning.
In the present embodiment, the quantity of wedge slot can be provided with a plurality of according to design or requirements of one's work, can be provided with 3-6 in concrete the application, wherein, interval between each wedge slot can evenly be provided with, and be provided with the locking steel ball in each wedge slot, all act on each locking steel ball limit spring is arranged, guaranteed the stressed all even stability of nutted rod and locking steel ball, the quantity that wedge slot and locking steel ball are provided with is many more, the precision that puts in of nutted rod and stability are just high more, the one-way locking effect that nutted rod is realized is just good more, preferably, and as shown in Figure 4, tensioner body 1 upper end is provided with the uniform wedge slot 4 in 4 intervals that is symmetrically set in the present embodiment, and is provided with locking steel ball 5 in each wedge slot 4 and is pressed on the limit spring of locking on the steel ball.
In the present embodiment, can also be set to other various elastic members between limiting board and the locking steel ball, as elastic members such as elastic caoutchoucs, its elastic force that acts on the locking steel ball can elastic member be set yet and limiting board is arranged to elastic plate, as long as can satisfy the one-way locking function of nutted rod.
Present embodiment can be realized the no rank tensioning of nutted rod and the retraction of restriction nutted rod equally, basic identical with the foregoing description one principle particularly, different is, be provided with limit spring owing to above the locking steel ball, pressing in the present embodiment, guaranteed that under the elastic force effect of limit spring the locking steel ball can be in contact condition all the time with the inwall of wedge slot and the outer surface of nutted rod, make the no rank of nutted rod put in more steady, improved the one-way locking function of nutted rod, guarantee the stability and the tensioning sensitivity of the tensioning of stretcher further, can satisfy the tensioning demand of various chains.
In addition, the lower end of tension spring 3 can be installed on the tensioner body 1 by fixed plate, also can be fixed in other mechanism by alternate manner, as fixing bolt etc., in the practical application, can fix tension spring 3 according to actual needs, guarantee that stretcher can provide enough tension forces for chain.In addition, also be provided with on the tensioner body 1 and be convenient to the mounting hole installed with other mechanism, concrete shape and the position is set sets according to concrete needs.
Application to the embodiment of the invention is introduced below, so that the present invention is had a better understanding.As shown in Figure 5, be the concrete scheme of installation of using of stretcher embodiment of the present invention.Embodiment of the invention stretcher can be applicable on the chain drive, and particularly, the present embodiment stretcher is applied in the timing chain mechanism, is used for timing chain is carried out tensioning, guarantees the stability and the reliability of timing chain operation.As shown in Figure 5, present embodiment stretcher 10 is installed on the cylinder body 30 of motor by the fixed hole on it, wherein the nutted rod front end of stretcher 10 also is provided with a tensioning plate 20, tensioning plate 20 can directly contact with the timing chain 40 of motor, is used to apply uniform tension force and gives timing chain 40.Tension spring in the stretcher 10 can be installed on the stretcher 10 or on the engine cylinder-body 30 or in other mechanism by fixed plate all can, the position of as installed can be set according to needs particularly, to guarantee that tension spring can provide enough elastic force after final the installation, and guarantee to satisfy the actual tensioning needs of timing chain 40 by the tension force that nutted rod is applied to timing chain, after also will guaranteeing simultaneously the long-time running of chain, tension spring still can provide enough tension forces so that timing chain can be in tensioning state all the time.The position of flexible size of tension spring and installation be tension force according to the timing chain actual demand and fixed, different motors and timing chain can be installed the corresponding tension spring that satisfies its needs.
After installation, because the locking steel ball in the stretcher is under the effect of the elastic force of limit spring, the inwall that the wedge slot of feasible locking steel ball and stretcher tilts and the outer surface of nutted rod are in complete state of contact all the time, have realized that the unidirectional of nutted rod stretches out, and can not bounce back.Particularly, after the installation, under the effect of tension spring elastic force, nutted rod in the stretcher smoothly stretches out and applies tension force on timing chain in the effect lower edge of this tension spring elastic force tension direction, after tension force acquires a certain degree, because timing chain acts on the elastic force of the reaction force of tensioning plate and the tension spring that nutted rod is subjected to, the support force of locking steel ball and the rolling friction equilibrium of forces between locking steel ball and the nutted rod, nutted rod stops to travel forward, stretcher is finished the tensioning of timing chain, and this moment, timing chain was in tensioning state; When timing chain after long running, because it is loosening or elongated that wearing and tearing etc. cause timing chain to occur, stretcher diminishes by the tension force that tensioning plate acts on timing chain, this moment, nutted rod can continue smoothly to put in and apply tension force on timing chain by tensioning plate under the effect of tension spring elastic force along tension direction, assurance is applied to the tension force on the timing chain, makes timing chain be in tensioning state all the time; Simultaneously, in the running of chain, because vibration etc. may cause that timing chain can act on bigger reaction force on tensioning plate, the trend of will inevitably be under the effect of this reaction force oriented retraction direction motion of nutted rod this moment, and this moment, nutted rod is at the support force of locking steel ball, be in the one-way locking state under the effect of the sliding friction between locking steel ball and the nutted rod and the elastic force of tension spring, nutted rod can't bounce back, thereby the stability and the reliability of nutted rod tensioning have been guaranteed, alleviate or eliminated timing chain and produce bigger noise, also guaranteed quality and the working life of motor simultaneously because of the vibration in the movement process makes motor.
The embodiment of the invention is by being provided with wedge slot in the tensioner body upper end, and the locking steel ball is set within it and is pressed on the limit spring of locking on the steel ball, state in realization on embodiment one the basis of technique effect, improve the sensitivity and the stability of stretcher tensioning further, satisfied the needs of the tensioning of various chains.
Among each embodiment of the invention described above, the concrete shape and size of the quantity of the wedge slot that is provided with on the tensioner body, wedge slot can be set according to actual needs; The diameter of locking steel ball and the groove width of wedge slot are Spielpassung, to guarantee that locking steel ball and nutted rod can be in contact condition always, in addition, the locking position of steel ball in real work should be in all the time in the wedge slot and can not run out of, preferably be in the medium position of wedge slot, steel ball contacts with the point of nutted rod and wedge slot and the one-way locking of nutted rod as long as finally can guarantee to lock.
It should be noted that at last: above embodiment is only in order to technological scheme of the present invention to be described but not limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technological scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technological scheme break away from the spirit and scope of technical solution of the present invention.
Claims (6)
1, a kind of stretcher, comprise the tensioner body that is provided with pilot hole, and be slidedly arranged on nutted rod and tension spring in the described pilot hole, it is characterized in that, described tensioner body one end offers wedge slot, be provided with the lock ball that contacts with the nutted rod outer surface with the wedge slot inwall in the described wedge slot, described lock ball is provided with presses the limiting board of establishing described lock ball.
2, stretcher according to claim 1 is characterized in that, also is provided with elastic member between described limiting board and the lock ball.
3, stretcher according to claim 2 is characterized in that, described elastic member is a limit spring.
4, stretcher according to claim 3 is characterized in that, also comprises, described limiting board lower surface is provided with directional post, and described limit spring is sheathed on the described directional post.
According to the arbitrary described stretcher of claim 1-4, it is characterized in that 5, described wedge slot is 3～6.
6, stretcher according to claim 5 is characterized in that, described wedge slot is evenly to be provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102250063A CN101387335A (en) | 2008-10-23 | 2008-10-23 | Tensioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102250063A CN101387335A (en) | 2008-10-23 | 2008-10-23 | Tensioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101387335A true CN101387335A (en) | 2009-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102250063A Pending CN101387335A (en) | 2008-10-23 | 2008-10-23 | Tensioner |
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| Country | Link |
|---|---|
| CN (1) | CN101387335A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678854A (en) * | 2012-05-17 | 2012-09-19 | 马丁路德机器人（上海）有限公司 | Automatic tensioning mechanism of open-loop synchronous belt |
| CN103836135A (en) * | 2012-11-27 | 2014-06-04 | 谢夫勒科技股份两合公司 | Mechanical clamping apparatus for traction mechanism of traction mechanism gear |
| CN107176091A (en) * | 2016-10-28 | 2017-09-19 | 叶波 | A kind of safe locking device of logistics transportation |
| CN110652771A (en) * | 2019-08-28 | 2020-01-07 | 宁夏共享机床辅机有限公司 | Circulating filter belt tensioning device and filter |
| CN112377582A (en) * | 2020-12-10 | 2021-02-19 | 蚌埠市广瑞机械有限公司 | Tensioner with adjustable tension |
-
2008
- 2008-10-23 CN CNA2008102250063A patent/CN101387335A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678854A (en) * | 2012-05-17 | 2012-09-19 | 马丁路德机器人（上海）有限公司 | Automatic tensioning mechanism of open-loop synchronous belt |
| CN102678854B (en) * | 2012-05-17 | 2014-08-20 | 马丁路德机器人（上海）有限公司 | Automatic tensioning mechanism of open-loop synchronous belt |
| CN103836135A (en) * | 2012-11-27 | 2014-06-04 | 谢夫勒科技股份两合公司 | Mechanical clamping apparatus for traction mechanism of traction mechanism gear |
| CN107176091A (en) * | 2016-10-28 | 2017-09-19 | 叶波 | A kind of safe locking device of logistics transportation |
| CN110652771A (en) * | 2019-08-28 | 2020-01-07 | 宁夏共享机床辅机有限公司 | Circulating filter belt tensioning device and filter |
| CN112377582A (en) * | 2020-12-10 | 2021-02-19 | 蚌埠市广瑞机械有限公司 | Tensioner with adjustable tension |
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Open date: 20090318 |