CN102808912B - Friction transmission structure and gear transmission capable of idling in overload state - Google Patents
Friction transmission structure and gear transmission capable of idling in overload state Download PDFInfo
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- CN102808912B CN102808912B CN201210290897.7A CN201210290897A CN102808912B CN 102808912 B CN102808912 B CN 102808912B CN 201210290897 A CN201210290897 A CN 201210290897A CN 102808912 B CN102808912 B CN 102808912B
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- 238000009434 installation Methods 0.000 description 3
- 230000009347 mechanical transmission Effects 0.000 description 3
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Abstract
The invention discloses a friction transmission structure and a gear transmission capable of idling in an overload state. One of a rotating shaft and a transmission shaft of a gear transmission mechanism of the gear transmission is provided with a gear with a special structure; the special point of the gear includes that an inner hole ring slot is arranged on an inner hole of the gear, and correspondingly, an excircle ring slot is arranged at a corresponding assembly position of a shaft section for mounting the gear; and a regularly polygonal friction spring with five sides at least and ten sides at most is clamped in a ring cavity formed by matching the inner hole ring slot with the excircle ring slot and is in static friction matching with the inner hole ring slot and the excircle ring slot. The friction transmission structure and the gear transmission capable of idling in the overload state are compact in structure and long in service life.
Description
Technical field
The present invention relates to a kind of mechanical transmission, specifically friction driving structure, also relate to simultaneously and to transship the gear drive of idle running based on this slip gear a kind of.
Background technique
Known, gear drive is practical application the most a kind of mechanical transmission mechanism.It can be used to the motion and the power that transmit space any two between centers, and there is compact structure, the feature such as power range is large, transmission efficiency is high, velocity ratio is accurate, long service life.But the positive drive of this mechanical transmission mechanism be most widely used mainly based on higher pair, when producing overload, easily makes the form of gear tooth produce plastic deformation, cold welding wearing and tearing, the even consequence such as broken teeth.
Meanwhile, using generally by controlling the rotation of motor as sensitive switch, optoelectronic switch or program etc. in gear-driven existing mechanism, driven gear transmission device realizes the operation of machine or certain function module then.Wherein, sensitive switch and optoelectronic switch are the impact that main components and parts are inevitably subject to periphery electromagnetic environment, and produce misoperation or be failure to actuate; Control mode based on software then depends on running environment and the current state of control system, also unstable, easily breaks down or there is certain rate of fault, and this is the intrinsic feature of this kind of control mode, is difficult to avoid.
Therefore, such as service routine control containing in the application of gear drive, usually also can arrange as mechanical stop limiter, once program fluctuation of service causes software limit to lose efficacy, other parts of proterctive equipment can be carried out by hardware limit.But after arriving mechanical position limitation after the parts of gear drive control pass through the software limit lost efficacy, the impact of rigidity can be subject to, and load is strengthened suddenly, cause whole driving mechanism or motor to be subject to badly damaged.
In further realizing, can in mechanical driving part setting as the flexible drives of tape handler, when load increases suddenly, carrying out powerdriven tape handler based on friction can produce skidding, and can not produce destruction to other parts of driving mechanism.But, as previously mentioned, adopt the occasion of gear drive to select one of gear-driven object to be that velocity ratio is accurate, tape handler has the uncertain build-in attribute of velocity ratio, and the driving mechanism obviously containing tape handler is not suitable for being applied in precision drive.Certainly, except the toothed belt transmission in tape handler, but the principle of Timing Belt is similar to gear transmission, does not also have the ability of shock absorbing.And tape handler, the transmission efficiency as flat belt driving mechanism is the highest only has 85%, and along with wearing and tearing aggravation, it is very severe that transmission efficiency declines, and obviously this and gear drive are inconsistent to high efficiency transmission.
In some implementations, disk-type friction coupling is applied, and dependence frictional force transmits the power between motor and gear drive.When transmitted moment of torsion exceedes the maximum static friction force allowable torque of its friction disk, its friction disk can produce sliding friction, skids in other words, makes the load of gear drive within the scope of license, also can not produce excessive impact to motor.But disk-type friction coupling size is relatively complicated, and size is bigger than normal, and application is very restricted.In addition, disk-type friction coupling lacks wear compensation mechanism, and when friction disk may wear to a certain degree, transmission efficiency can degradation.
In other realize, a kind ofly to apply in gear transmission based on the structure of friction driving equally, take the form of the conversion of disk-type friction coupling, a pair friction disk engaged is the cone dish structure with certain taper, and one of them friction disk is fixed at friction disk axial position, and another friction disk floats at friction disk axial position, and compressed by the hold down gag of this axis, positive pressure required for frictional force generation is provided, meanwhile, can be used for the compensation of friction disk wearing and tearing.But this conversion can only reduce the complexity of friction gearing to a small extent.Through long-term research, inventor thinks, if think the complexity further reduced based on the device of friction driving, needs separately to ward off technical strategies.
Summary of the invention
Therefore, considering further based on friction driving, the invention provides a kind of friction driving structure that can be applicable to gear drive newly, and provides a kind of gear drive transshipping idle running accordingly.
For realizing goal of the invention of the present invention, the technological scheme adopted is:
A kind of friction driving structure, one of the rotating shaft or transmission shaft of gear drive are provided with the gear of a specified structure, the specific part of this gear is that its endoporus has internal circular-grooves, correspondingly, has annular groove outside for the shaft part installing described gear at corresponding rigging position;
One is more than or equal to 5 limits and the regular polygon friction spring that is less than or equal to 10 limits snaps in and coordinated with described annular groove outside by described internal circular-grooves and coordinate with inner ring annular groove and annular groove outside static friction in the ring cavity formed.
The application of so above-mentioned friction driving structure in gear drive shows as:
A kind of gear drive transshipping idle running, one of the rotating shaft or transmission shaft of described gear drive are provided with the gear of a specified structure, the specific part of this gear is that its endoporus has internal circular-grooves, correspondingly, the shaft part for installing described gear has annular groove outside at corresponding rigging position;
One is more than or equal to 5 limits and the regular polygon friction spring that is less than or equal to 10 limits snaps in and coordinated with described annular groove outside by described internal circular-grooves and coordinate with inner ring annular groove and annular groove outside static friction in the ring cavity formed.
Numerous based in the structure of friction driving, common configuration more complicated, for this reason, the present invention opens up a technical strategies, use spring as the middleware of friction driving, and this spring is regular polygon structure, after regular polygon spring is pressed into annular groove outside and internal circular-grooves, can deform, and the spring-back force that spring recovery distortion produces is into the positive pressure in generation friction.Because transmitted nominal torque is determined, so said specified positive pressure is also determined, the maximum positive voltage power in the margin of safety of design gear driving mechanism accordingly, it is relatively easy to design.
In addition, utilize annular groove can realize the axially locating of respective gears, no longer can need extra axially locating parts or structure to a certain extent, structure comparison is compact.Importantly, compared to the existing structure based on friction driving, it only needs to make change to a gear and axle thereof, and its structural compactness is far from the existing structure based on friction driving and compares.
Further in application, described gear is the input gear of gear drive/device, and is arranged on the shaft end of corresponding input shaft, reduces the assembling difficulty of the gear based on this class formation.
And about the limit number of described regular polygon friction spring, be preferably chosen as 6 limits or 8 limits with centrosymmetric structure.
In order to reduce the installation difficulty of gear, described regular polygon friction spring disconnects at one summit place.
Improve a method for friction factor, described internal circular-grooves and described annular groove outside are V-type groove; And the steel wire of described friction spring is Round Steel Wire.
Below in conjunction with Figure of description in detail technological scheme of the present invention being described in detail, is that those skilled in the art better understands and realizes the technological scheme that the present invention limits.
Accompanying drawing explanation
Fig. 1 is the structure principle chart (explosive view) according to a kind of gear drive transshipping idle running of the present invention.
Fig. 2 is for installing the special tooling sketch needed for friction spring in the present invention.
In figure: 1, load gear, 2, friction spring, 3, load transmission axle, 4, driving gear, 5, motor; 6, conus portion, 7, cylindrical portion.
Embodiment
Should understand, the first object of the present invention is to provide a kind of novel friction driving structure based on friction driving, and apply the gear drive of overload idle running of this friction driving structure, so about the size of required frictional force, should by extensive cognition in related domain according to the existing friction structure based on friction driving, the size of frictional force selects and required safety coefficient should be cognitive.
About the axially locating of respective gears, close and mention in aforesaid content, axially locating parts or structure can be cast out, but be illustrate can do so to a certain extent here, do not get rid of herein and use axially locating parts or structure.
Should understand, occurred as internal circular-grooves herein, answer the annular groove of spindle line and gear coaxial line.
A kind of friction driving structure, be applied in gear drive, be easier to understand, what apply is in the mechanism of accurate transmission, and gear drive can form the part in the mechanism of this accurate transmission.In such driving mechanism, one of rotating shaft or transmission shaft are provided with the gear of a specified structure, and the specific part of this gear is that its endoporus has internal circular-grooves, correspondingly, have annular groove outside for the shaft part installing described gear at corresponding rigging position;
One is more than or equal to 5 limits and the regular polygon friction spring that is less than or equal to 10 limits snaps in and coordinated with described annular groove outside by described internal circular-grooves and coordinate with inner ring annular groove and annular groove outside static friction in the ring cavity formed.
Known, d-axis can be divided into again: 1. rotating shaft, not only bears moment of flexure but also bear moment of torsion during work, is modal axle in machinery, as the axle etc. in various retarder.2. axle, being used for support rotary part only bears moment of flexure and not transmitting torque, and some central axis, as the axle etc. of railway vehicle, some axle is not then rotated, as the axle etc. of supporting pulley.3. transmission shaft, is mainly used to transmitting torque and does not bear moment of flexure, as the live axle etc. of the long optical axis in crane movable mechanism, automobile.In this article, friction driving structure is used for transmitting torque, and therefore, predictably, this friction driving structure can use in rotating shaft and transmission shaft.
In addition, due to the existence of annular groove outside, stress can be produced and concentrate, in designing and calculating, need to carry out Stress Check herein to axle, if desired, increase the diameter of axle.
To a certain extent, because transmitted torque ratio is comparatively large, described gear has in the axial direction is enough reliably located, especially when arranging internal circular-grooves and annular groove outside.But in order to reliable location, can special position structure or positioning element be set.
Why on two parts coordinated, namely gear and axle all arrange annular groove, be not only for location, in such a configuration, the space of spring deformation can be produced accordingly, conveniently to install.
Ying Zhi, the spring-back force of the friction spring used in said structure can ensure when producing some wearing and tearing, can auto-compensation, and certainly, this compensation is not whole compensation, but can ensure reliable transmission in the margin of safety of setting.
Ying Zhi, " friction " in friction spring Non-limiting terms, do not form the concrete restriction to spring structure.Here, can think that the one under embody rule occasion is simply distinguished.
About friction, described friction spring is made selecting the larger material of [coefficient of, this material has good friction factor with the storeroom of the axle be applied to and gear, through checking, the good material of current application is 65Mn, certainly, those skilled in the art can be select in the material that the close of 65Mn or character are close at grade of steel.
Should refer to, the wheel hub of gear is generally long, the spring that said friction spring can adopt circular section steel wire to make, and also can be the friction spring that flat spring makes, the former more easily makes, and the present stability of the latter is better.And it is evident that, formed and saidly axially can not occupy whole wheel hub as internal circular-grooves, so about the fit form of other parts of wheel hub and axle, inventor thinks should adopt conventional fit system at this, can ensure that friction spring is changing the stability in groove, and ensure that the centre distance of gear is reliable.Three kinds of fit systems all can adopt, and as in the application for frequent dismounting, can adopt Spielpassung, and adopt transition fit in the lower application of dismounting frequency, and in application for not dismounting substantially, can adopt interference fit.In this programme, preferably adopt interference fit, ensure gear with the coaxality of axle.
About the installation of friction spring, first the known mode of the special tooling shown in Fig. 2 is connected with axial end, the column part diameter of frock is identical with the end face part diameter of axle, friction spring is placed in the internal circular-grooves of gear, then direct the gear packaging friction spring to be moved toward the direction of axle by the tapered segment of frock, along with the increasing gradually of tapered segment diameter, the friction spring more and more circle be extruded slowly, after gear arrives the column part of frock, because two-part diameter is identical, now can advance toward axle head direction always, till annular groove outside on arrival axle, now friction spring is stuck between two annular grooves completely, so far assemble complete, pull down frock.
Interior annular groove opens the middle part at gear tooth width.
In the construction shown in fig. 1, described gear, load gear 1 namely shown in figure is the input gear of gear drive, be meshed with the driving gear 4 on motor 5, this structure can reduce the dismounting to selected gear when gear drive is safeguarded, and described gear is arranged on the shaft end of corresponding input shaft, can further reduce dismounting difficulty.
Preferably, the limit number of described regular polygon friction spring is 6 limits or 8 limits, and this structure is axially symmetric structure, when mounted, and convenient force.Obviously, limit number is more, more close to circle, but also just loses very much the basis utilizing recoil of spring power close to circle.Therefore, through checking, maximum can not more than 10 limits, and limit number is more, and manufacture difficulty is also larger.Limit number can not very little, easily make friction spring produce violent distortion very little, and produce work-hardening, friction spring easily lost efficacy, and therefore, limit number can not be less than 5 limits, made drift angle be greater than 90 degree.
Further, conveniently install, described regular polygon friction spring disconnects at one summit place, like this, when mounted, can a breakpoint be just that reference point is installed, and a limit is pressed into one by one.When there is no breakpoint, by means of the frock of the conical parts of pre-support, first friction spring can be supportted the shape close to installing in advance, and then is inserted in internal circular-grooves.
Preferably, described internal circular-grooves and described annular groove outside are V-type groove, can automatically locate, and meanwhile, the friction factor of V-type groove is relatively large; So corresponding, the steel wire of described friction spring is Round Steel Wire.About the size at the V-type angle of V-type groove, in theory 60 degree time can obtain larger friction factor, but this certainly will cause groove depth relatively large, and the theoretic springback capacity of friction spring can be larger, be unfavorable for installing, and larger to the Torsion Section index impacts of axle.For this reason, through selecting, adopting the V-type angle of 120 degree, the diameter of axle being converted relatively mild, convenient installation, and smaller to slackening of axle.
Fig. 1 is a kind of structural principle of the gear drive transshipping idle running, is the embody rule of above-mentioned friction driving structure, can have and clearly understand, do not repeat them here according to other parts herein to this.
In the construction shown in fig. 1, load gear 1 has individual groove above, can friction spring 2 be buckled in the groove of load gear 1, load gear 1 is contained on load transmission axle 3 by special frock, load transmission axle 3 also there is the groove that similar, can prevent load gear 1 from occurring movable, friction spring 2 is regular hexagon spring, can be circular by rigid extruding after loading load gear 1, thus produce the frictional force of a relative constancy, torsion puts on load gear 1 by driving gear 4 by motor 5, load gear 1 drives load transmission axle 3 to rotate by this constant frictional force again, then the smooth running of whole machine is driven, when load increases suddenly and exceedes the constant load value of setting, relative displacement will be there is between load gear 1 and load transmission axle 3 slide, at this moment load gear 1 just starts idle running, load transmission axle 3 cannot be driven again to be rotated further, the load force exceeded just is unloaded in friction spring place, effectively protect the safety of equipment and motor.
Claims (10)
1. a friction driving structure, it is characterized in that, one of the rotating shaft or transmission shaft of gear drive are provided with the gear of a specified structure, the specific part of this gear is that its endoporus has internal circular-grooves, correspondingly, the shaft part for installing described gear has annular groove outside at corresponding rigging position;
One is more than or equal to 5 limits and the regular polygon friction spring that is less than or equal to 10 limits snaps in and coordinated with described annular groove outside by described internal circular-grooves and coordinate with inner ring annular groove and annular groove outside static friction in the ring cavity formed.
2. friction driving structure according to claim 1, is characterized in that, described gear is the input gear of gear drive, and is arranged on the shaft end of corresponding input shaft.
3. friction driving structure according to claim 1, is characterized in that, the limit number of described regular polygon friction spring is 6 limits or 8 limits.
4. the friction driving structure according to claim 1 or 3, is characterized in that, described regular polygon friction spring disconnects at one summit place.
5. friction driving structure according to claim 1, is characterized in that, described internal circular-grooves and described annular groove outside are V-type groove; And the steel wire of described friction spring is Round Steel Wire.
6. one kind transships the gear drive of idle running, it is characterized in that, one of the rotating shaft or transmission shaft of described gear drive are provided with the gear of a specified structure, the specific part of this gear is that its endoporus has internal circular-grooves, correspondingly, the shaft part for installing described gear has annular groove outside at corresponding rigging position;
One is more than or equal to 5 limits and the regular polygon friction spring that is less than or equal to 10 limits snaps in and coordinated with described annular groove outside by described internal circular-grooves and coordinate with inner ring annular groove and annular groove outside static friction in the ring cavity formed.
7. the gear drive of overload idle running according to claim 6, is characterized in that, described gear is the input gear of gear drive, and is arranged on the shaft end of corresponding input shaft.
8. the gear drive of overload idle running according to claim 6, is characterized in that, the limit number of described regular polygon friction spring is 6 limits or 8 limits.
9. the gear drive of the overload idle running according to claim 6 or 8, is characterized in that, described regular polygon friction spring disconnects at one summit place.
10. the gear drive of overload idle running according to claim 6, is characterized in that, described internal circular-grooves and described annular groove outside are V-type groove; And the steel wire of described friction spring is Round Steel Wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210290897.7A CN102808912B (en) | 2012-09-07 | 2012-09-07 | Friction transmission structure and gear transmission capable of idling in overload state |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210290897.7A CN102808912B (en) | 2012-09-07 | 2012-09-07 | Friction transmission structure and gear transmission capable of idling in overload state |
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| Publication Number | Publication Date |
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| CN102808912A CN102808912A (en) | 2012-12-05 |
| CN102808912B true CN102808912B (en) | 2015-02-25 |
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| CN201210290897.7A Active CN102808912B (en) | 2012-09-07 | 2012-09-07 | Friction transmission structure and gear transmission capable of idling in overload state |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121832B (en) * | 2016-08-12 | 2022-10-11 | 江门市英合创展电子有限公司 | Gear set transmission intake manifold access controller |
| CN106196542A (en) * | 2016-08-15 | 2016-12-07 | 珠海格力电器股份有限公司 | Roller mechanism and air conditioner with same |
| CN109245050B (en) * | 2018-09-20 | 2020-05-22 | 广州卓帝电子科技有限公司 | Motor protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1384173A (en) * | 1918-05-10 | 1921-07-12 | S K F Ball Bearing Company | Flexible bushing |
| US3929392A (en) * | 1973-02-15 | 1975-12-30 | Nissan Motor | Resilient bearing structure |
| US3980352A (en) * | 1973-05-11 | 1976-09-14 | Tribotech Incorporated | Spring bearing assembly |
| EP1586782A1 (en) * | 2004-04-16 | 2005-10-19 | Eugen Spintzyk | Overload protection device |
| CN101956800A (en) * | 2009-07-13 | 2011-01-26 | 鸿富锦精密工业（深圳）有限公司 | Gear overload protection device |
| CN102039869A (en) * | 2009-10-20 | 2011-05-04 | 株式会社东海理化电机制作所 | Webbing take-up device |
| CN202746437U (en) * | 2012-09-07 | 2013-02-20 | 山东神戎电子股份有限公司 | Friction drive structure and overload gear transmission device capable of idling |
-
2012
- 2012-09-07 CN CN201210290897.7A patent/CN102808912B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1384173A (en) * | 1918-05-10 | 1921-07-12 | S K F Ball Bearing Company | Flexible bushing |
| US3929392A (en) * | 1973-02-15 | 1975-12-30 | Nissan Motor | Resilient bearing structure |
| US3980352A (en) * | 1973-05-11 | 1976-09-14 | Tribotech Incorporated | Spring bearing assembly |
| EP1586782A1 (en) * | 2004-04-16 | 2005-10-19 | Eugen Spintzyk | Overload protection device |
| CN101956800A (en) * | 2009-07-13 | 2011-01-26 | 鸿富锦精密工业（深圳）有限公司 | Gear overload protection device |
| CN102039869A (en) * | 2009-10-20 | 2011-05-04 | 株式会社东海理化电机制作所 | Webbing take-up device |
| CN202746437U (en) * | 2012-09-07 | 2013-02-20 | 山东神戎电子股份有限公司 | Friction drive structure and overload gear transmission device capable of idling |
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