CN204692484U - A kind of flexible drive low frequency type tension device a little - Google Patents
A kind of flexible drive low frequency type tension device a little Download PDFInfo
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- CN204692484U CN204692484U CN201520412219.2U CN201520412219U CN204692484U CN 204692484 U CN204692484 U CN 204692484U CN 201520412219 U CN201520412219 U CN 201520412219U CN 204692484 U CN204692484 U CN 204692484U
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- little
- low frequency
- tension device
- driving mechanism
- flexible drive
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Abstract
The utility model discloses a kind of flexible drive low frequency type tension device a little.Comprise frame, planetary gears, crankrocker mechanism and tensioning actuator; Follower shaft is hollow structure, with flange, bolt by its one end and follower affixed, its other end to be then bearing in frame and rotatable; Planetary gears is arranged in the follower cylindrical space of hollow, and gear ring is arranged in follower inside circumference, and planetary pinion engages with central gear, gear ring, and central gear is fixed in frame; Planet carrier arranges crank pin, and with crank pin, connecting rod, hinged formation crankrocker mechanism between rocking bar and frame, and configuration bar is long moves than making rocking bar make little pivot angle; Pinch roller is arranged on the guide rod affixed with rocking bar.This device does not rely on gravity principle, when frame is done complex space motion or in slight gravity even weightlessness, when conventional tensioning mode lost efficacy, still had tensioning and shock sucking function.
Description
Technical field
The automatic takeup that the utility model uses under relating in frictional or engagement type flexible drive the bad occasion even can not gathering effect of conventional tensioning mode effect, particularly relates to a kind of flexible drive low frequency type tension device a little.
Background technique
Flexible drive is very general in mechanical transmission, can be made up of two or more drive wheel and intermediate annular flexible element, during driving wheel motion, by flexible element, motion and moment is passed to each drive wheel.Common flexible drive mainly contains with belt wheel, sprocket wheel and the rope sheave V belt translation that is drive wheel, Chain conveyer and rope drive, and its flexible element is respectively transfer tape, transfer chain and transmission rope; From transmission principle, common flexible drive has frictional and the large class of engagement type two, wherein frictional flexible drive must be attended by elasticity sliding motion, therefore can not ensure accurate speed ratio, and engagement type flexible drive such as synchronous cog belt then can realize accurate phase matching; Be frictional or and engagement type transmission all need tension device, also inevitably there is the shimmy problem of flexible element in flexible drive simultaneously.Conventional tensioning mode has: (1) regularly tensioning, is implemented mainly through screwing adjusting bolt; (2) auto-tensioning, realizes mainly through centre-of gravity shift; (3) Idle wheel tensioning, is mainly used in the nonadjustable situation of centre distance.
Utilize screw to adjust centre distance and be applicable to drive wheel horizontal arrangement or vertically arranged situation, and because compressing without Idle wheel, can not tension force be ensured; Utilize the automatic takeup of gravity, the classics though be skillfully constructed, but when frame has larger inclination in the course of the work, or working environment be in weight power, microgravity even under zero-g (namely weightless) condition time, this tensioning mode just cannot gather effect.In addition, existing tensioning mode does not possess the shimmy function of absorption flexible element.
Model utility content
In order to solve in frictional or engagement type flexible drive, the bad problem of imitating of even can not gathering of conventional tensioning mode effect, the utility model provides a kind of flexible drive low frequency type tension device a little.
To achieve these goals, the technological scheme that the utility model is taked is: a kind of flexible drive low frequency type tension device a little, and it comprises:
Tensioning actuator, for compressing the flexible element of flexible gear;
First driving mechanism, for output drive strength; And
Second driving mechanism, is connected with the first driving mechanism, and has and to be connected with tensioning actuator and to make the power output part of oscillating motion.
Described tensioning actuator comprises the guide rod be connected with the power output part of described second driving mechanism and the pinch roller be sheathed on guide rod.
Described second driving mechanism is crankrocker mechanism, and the rocking bar of crankrocker mechanism is as the power output part be connected with described guide rod, and rocking bar does frequency wobbles motion a little.
Described second driving mechanism comprises the connecting rod be connected with described first driving mechanism, and described rocking bar comprises first body of rod be connected with link rotatable and second body of rod be fixedly connected with first body of rod, and described guide rod is connected with second body of rod.
Described first body of rod is straight-bar, and described second body of rod is arc.
Described first driving mechanism is planetary gears, it central gear comprising the planet carrier be connected with described link rotatable, the planetary pinion be connected with planet carrier, the gear ring engaged with planetary pinion and be arranged at gear ring inner.
Described gear ring is coaxially fixedly connected with the follower of flexible gear, and described central gear is for being fixedly installed, and the rotating speed of described planet carrier is less than the rotating speed of gear ring.
Described connecting rod is connected with described planet carrier by crank pin, and the axis of crank pin parallels with the axis of planet carrier.
Flexible drive also comprises frame with low frequency type tension device a little, and described rocking bar is connected with gantry rotation.
Described first driving mechanism also comprises the center-wheel arbor be arranged in described frame, and described central gear is arranged on center-wheel arbor.
Flexible drive of the present utility model low frequency type tension device a little, tool has the following advantages:
1., using the planet carrier of epicyclic train as crank, drive tensioning actuator with the rocking bar of crankrocker mechanism, combined and matched design by the type selecting of epicyclic train and crankrocker mechanism, realize the tensioning of low frequency a little of pinch roller; By single-degree-of-freedom epicyclic train of gears---the high-speed motion of the follower of flexible gear is converted to the low-speed motion of crank by epicyclic train, and the low frequency realizing rocking bar motion exports; For crankrocker mechanism, by the long matched design of bar, obtain the little pivot angle scope of rocking bar motion, realize the small motion of rocking bar;
2. supporting base is set in frame, follower shaft adopts hollow structure, with flange and bolt, follower shaft one end is fixedly connected with follower, adopts the angular contact ball bearing of paired mounting to be installed on supporting base by follower shaft, realize relatively rotating of follower and frame; In center-wheel arbor one end, external splines is set, the other end arranges flanged structure, by the follower shaft of center-wheel arbor through hollow, its external splines is combined with central gear internal spline, its flanged structure is formed a fixed connection by bolt and supporting base end face, realizes being fixedly connected with of central gear and frame; In space layout, the plane of movement of follower shaft, center-wheel arbor and bearing device thereof and crankrocker mechanism is arranged separately at the plane of movement both sides of follower or epicyclic train, avoids movement interference;
3. this flexible element tension device does not rely on gravity principle, when the frame of flexible drive does complicated spatial motion, or flexible drive be in weight power, microgravity even under zero-g (i.e. weightlessness) condition time still can play tension;
4. this flexible element tension device adopts large speed ratio planet wheel braking technique and little pivot angle rocking bar designing technique, this device tension roller is made to have the movement characteristic of low frequency a little, therefore, avoid the danger with flexible element generation high-frequency resonance on the one hand, on the other hand, rubber pinch roller absorbs in addition and slows down the function of flexible element vibration.
Accompanying drawing explanation
This specification comprises the following drawings, shown content respectively:
Fig. 1 is the structural representation of frame;
Fig. 2 is the structural representation of follower shaft;
Fig. 3 is the structural representation of follower;
Fig. 4 is the structural representation of central gear;
Fig. 5 is the structural representation of center-wheel arbor;
Fig. 6 is planetary structural representation;
Fig. 7 is the structural representation of planet carrier;
Fig. 8 is the structural representation of connecting rod;
Fig. 9 is the structural representation of rocking bar;
The structural representation of Figure 10 the utility model tension device;
Be labeled as in figure:
1, frame; 11, base plate; 12, supporting base; 13, hinge base; 14, through hole; 15, counterbore; 16, through hole; 17, square groove; 18, tapped hole;
2, planetary gears;
21, follower shaft; 211, flange; 212, through hole; 213, outside thread; 214, the shaft shoulder; 215, the first axle body;
22, follower; 221, large through-hole; 222, small through hole; 23, gear ring;
24, central gear; 241, the gear teeth; 242, internal spline;
25, center-wheel arbor; 251, external splines; 252, flange; 253, through hole; 254, the second axle body;
26, planetary pinion; 261, the gear teeth; 262, through hole;
27, planet carrier; 271, planet wheel shaft; 272, pivoted arm;
3, crankrocker mechanism; 31, crank pin; 32, connecting rod; 321, through hole; 322, through hole;
33, rocking bar; 331, first body of rod; 332, second body of rod; 3311, through hole; 3312, through hole; 3321, through hole;
4, tensioning actuator; 41, guide rod; 42, pinch roller; 5, flexible element.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, be described in further detail embodiment of the present utility model, object helps those skilled in the art to have more complete, accurate and deep understanding to design of the present utility model, technological scheme, and contribute to its enforcement.
As shown in Figures 1 to 10, the utility model provides a kind of flexible drive low frequency type tension device a little, and it comprises tensioning actuator 4, first driving mechanism and the second driving mechanism.Tensioning actuator 4 is flexible element 5, first driving mechanisms for compressing flexible gear is for output drive strength; From the first driving mechanism to the drive path of tensioning actuator 4, second driving mechanism is between the first driving mechanism and tensioning actuator 4, second driving mechanism is connected with the first driving mechanism, and have and to be connected with tensioning actuator 4 and to make the power output part that frequency wobbles a little moves, namely the driving force that the first driving mechanism exports is passed to the second driving mechanism, drive the power output part of the second driving mechanism to do frequency wobbles motion a little, this power output part finally drives tensioning actuator 4 to do frequency wobbles motion a little.
Specifically, existing flexible gear is generally made up of the flexible element 5 of two or more drive wheel and annular, and drive wheel comprises driving wheel and follower, and driving wheel operates, and drives follower to operate by flexible element 5.
As preferably, the driving source of first driving mechanism of this tension device takes from the follower 22 of flexible gear, and follower 22 operates, thus power is passed to the second driving mechanism through the first driving mechanism.As shown in Figure 10, this tension device also comprises frame 1, and follower 22 and the second driving mechanism are all arranged in frame 1.Frame 1 comprises base plate 11, and base plate 11 is rectangular thin-slab structure.
As preferably, as shown in Figure 10, the first driving mechanism is planetary gears 2, and the second driving mechanism is crankrocker mechanism 3, and planetary gears 2 combines with crankrocker mechanism 3 by this tension device, and planetary gears 2 plays power transmission and decelerating effect.First driving mechanism comprises planet carrier 27, the planetary pinion 26 be arranged on planet carrier 27, the gear ring 23 engaged with planetary pinion 26 and be arranged at the central gear 24 of gear ring 23 inside, it is inner that planetary pinion 26 is also positioned at gear ring 23, and keep engaging with central gear 24.
As shown in figs. 3 and 10, the gear ring 23 of the first driving mechanism has the internal tooth that a circle engages with planetary pinion 26, and gear ring 23 is also coaxially fixedly connected with the follower 22 of flexible gear.Follower 22 is cylindrical, hollow shell construction, its outer surface is for installing flexible element 5, gear ring 23 is the cylindrical wheel rim inside being fixedly installed on follower 22, and follower 22 is arranged in frame 1 by follower shaft 21, and the wheel hub of follower 22 center is fixedly connected with follower shaft 21.
As shown in Figure 2, follower shaft 21 comprises the first axle body 215 and is arranged at the flange 211 of the first axle body 215 one end, and the first axle body 215 is hollow cylindrical structure, and flange is disc-shaped structure, and flange is coaxially fixedly connected with the first axle body 215.Flange 211 has 4 through holes 212, correspondingly on the wheel hub of follower 22 center, be provided with 4 small through hole 222, through hole 212 position on small through hole 222 position and flange aligns rear construction bolt, can realize follower shaft 21 and coaxially be fixedly connected with follower 22.
As shown in Figure 1, the base plate 11 of frame 1 is provided with the supporting base 12 for installing follower shaft 21, supporting base 12 geometrical shape is semicolumn and cuboid combination, be fixedly installed on base plate 11 upper surface one end, through hole 14 is had at semicolumn center, the both ends of the surface of supporting base 12 respectively have concentric counterbore 15, and the ear end face place of keeping to the side of supporting base 12 is also provided with tapped hole 18.As shown in Figure 2, the first axle body 215 of follower shaft 21 is provided with the protruding shaft shoulder 214, for axially locating bearings mounted between follower shaft 21 and counterbore 15, follower shaft 21 is supported in supporting base 12 by two bearings of outer ring and counterbore 15 interference fit.The outer surface of the other end of the first axle body 215 is provided with outside thread 213, and outside thread 213 place, by mounting nuts, realizes the axial limiting of follower shaft 21 on supporting base 12, and follower shaft 21 only can be rotated on supporting base 12.
The central gear 24 of the first driving mechanism is for being fixedly installed, first driving mechanism also comprises the center-wheel arbor 25 be arranged in frame 1, as shown in Figure 5, center-wheel arbor 25 comprises the second axle body 254 and is arranged at the flange 252 of the second axle body 254 one end, and the other end of the second axle body 254 is provided with external splines 251.The second axle body 254 runs through the first axle body 215 of hollow vertically, end the second axle body 254 with external splines is stretched out from the first axle body 215 and inserts follower 22 inside, the internal spline 242 that the center of central gear 24 is arranged engages with the external splines 251 of center-wheel arbor 25, and central gear 24 is fixed on center-wheel arbor 25.Flange 252 has through hole 253 near rim section, and through hole 253 aligns with tapped hole 18 position on supporting base 12, realizes the relative fixing of center-wheel arbor 25 and frame 11, and make central gear 24 become fixed gear by stud.
As shown in Figure 4, its wheel rim is processed with the gear teeth 241 to central gear 24 structure, is provided with internal spline 242 in its axial location.As shown in Figure 6, its wheel rim is provided with the gear teeth 261 to planetary pinion 26 structure, and its centerline has through hole 262; Planetary pinion 26 engages with central gear 24 and gear ring 23 respectively.
The gear ring 23 of the first driving mechanism is as power input part, and central gear 24 is fixed, and planet carrier 27 is as power output part, and the rotating speed of planet carrier 27 is less than the rotating speed of gear ring 23.As shown in Figure 7, it comprises pivoted arm 272 and planet wheel shaft 271 connected vertically with pivoted arm 272 to planet carrier 27 structure.Pivoted arm 272 is rod-like structure, has three, and one end of three pivoted arms 272 is mutually 120 ° is fixedly connected with, and forms Y shape component, on the axis being centrally located at gear ring 23 of Y shape component.Planet wheel shaft 271 is fixedly installed on the other end of each pivoted arm 272, each planet wheel shaft 271 is arranged respectively a planetary pinion 26, during assembling, through hole 262 pine of 3 planetary pinions 26 is enclosed within three planet wheel shafts 271, and axial positioning structure is set at the axle head of three planet wheel shafts 271, for the axially locating of planetary pinion 26.
As shown in Figure 10, second driving mechanism is made up of crank pin 31, connecting rod 32 and rocking bar 33, one end of connecting rod 32 is connected with a pivoted arm 272 by crank pin 31, connecting rod 32 the other end and rocking bar 33 are rotationally connected, the crank length of the distance of the position of crank pin 31 on pivoted arm 272 and Y shape member center to be R, R be crankrocker mechanism 3.As shown in Figure 8, the rod body of connecting rod 32 is divided into cuboid, and its two ends are cylindric, respectively has through hole 321 and through hole 322 respectively at cylindrical center's line position; During assembling, through hole 321 pine of connecting rod 32 is enclosed within crank pin 31, and arranges axial positioning structure at the axle head of crank pin 31, realizes the chain connection of crank and connecting rod 32.
As shown in Figure 9, the rocking bar 33 of the second driving mechanism comprises first body of rod 331 be rotationally connected with connecting rod 32 and second body of rod 332 be fixedly connected with first body of rod 331, consider the position of flexible element 5 and tensioning actuator 4, first body of rod 331 is straight-bar, second body of rod 332 is the curved bar of arcuate structure, one end and the connecting rod 32 of first body of rod 331 are rotationally connected, and the other end is fixedly connected with one end of second body of rod 332, and the rocking bar 33 of formation is similar to " G " shape structure.The two ends of first body of rod 331 respectively have through hole 3311 and through hole 3312, the other end of second body of rod 332 has through hole 3321, during assembling, with straight pin through through hole 3311 and through hole 322, and the chain connection that axial positioning structure realizes connecting rod 32 and rocking bar 33 is set at the axle head of straight pin, with straight pin through through hole 16 and through hole 3312, and axial positioning structure is set at the axle head of straight pin, realize hinge base 13 chain connection set on rocking bar 33 and base plate 11 upper surface, hinge base 13 has through hole 16.As shown in Figure 1, along having square groove 17 with the direction of through hole 16 axes normal on hinge base 13, avoid producing when rocking bar 33 rotates hindering.
As shown in Figure 10, the pinch roller 42 that tensioning actuator 4 comprises guide rod 41 and is sheathed on guide rod 41, guide rod 41 is connected with the end vertical of second body of rod 332, and the axis of guide rod 41 parallels with the axis of follower 22, and pinch roller 42 is rubber roll.During assembling, guide rod 41 be interference fit with the second body of rod 332 end vias 3321 of rocking bar 33, and through hole 3321 is passed and with nut locking in one end of guide rod 41, realizes being fixedly connected with of guide rod 41 and rocking bar 33 end.Pinch roller 42 pine is enclosed within guide rod 41 shaft, and arranges axial positioning structure at the axle head of guide rod 41, relatively rotating both realizing with the Spielpassung between guide rod 41 and rubber roll; After assembling, pinch roller 42 is pressed on flexible element 5.
The tension device of said structure in the course of the work, when the driving wheel of flexible gear moves, makes follower 22 do fixed-axis rotation around the axis of supporting base 12 by flexible element 5, and the number of teeth of note gear ring 23 is Z
w, its rotating speed is n
w; The rotating speed of planet carrier is n
b; The number of teeth of central gear 24 is Z
n, its rotating speed is n
n=0; The speed ratio of this planetary gears 2 is:
n
w/n
b＝(Z
w+Z
n)/Z
w(1)
Planet carrier 27 output speed is:
n
b＝n
w·Z
w/(Z
w+Z
n) (2)
Because of Z
w+ Z
n>Z
w, so n
b<n
w, and planet carrier 27 is identical with crank rolling velocity, therefore the rocking bar 33 of crankrocker mechanism 3 makes frequency wobbles.
The distance of the axis of the through hole 16 on the axis of the through hole 14 on supporting base 12 and hinge base 13 is exactly the frame pole length of crankrocker mechanism 3, distance between crank pin 31 to pivoted arm 272 gyration center line is crank length, in the two ends through hole 321 of connecting rod 32 and through hole 322, distance is in the heart connecting rod 32 length, in first body of rod 331 two ends through hole 3311 of rocking bar 33 and through hole 3312, distance is in the heart rocking bar length, little pivot angle slotted link mechanism is adopted to crank rocker, through geometry and scale Design, by crank, connecting rod 32, rocking bar, frame bar bar length than coupling is: 1:2:10k:10k, k is arithmetic number or positive integer.If get k=1, then the pivot angle of rocking bar is 5.78 °; If get k=4, then the pivot angle of rocking bar is 2.87 °; Therefore rocking bar is micro-swinging.
Because the end of guide rod 41 with second body of rod 332 of rocking bar is fixedly connected with, and pinch roller 42 pine is enclosed within guide rod 41 shaft, and therefore, the pinch roller 42 be pressed on flexible element 5 also makes frequency wobbles a little.The low frequency micro breadth oscillation of pinch roller 42 avoids the danger that high-frequency resonance occurs with flexible element 5 on the one hand, and on the other hand, the pinch roller 42 of quality of rubber materials also has the function of absorbing vibration damping.
Below by reference to the accompanying drawings the utility model is exemplarily described.Obviously, the utility model specific implementation is not subject to the restrictions described above.As long as have employed the improvement of the various unsubstantialities that method of the present utility model is conceived and technological scheme is carried out; Or without improvement, above-mentioned design of the present utility model and technological scheme directly applied to other occasion, all within protection domain of the present utility model.
Claims (8)
1. a flexible drive low frequency type tension device a little, is characterized in that, comprising:
Tensioning actuator, for compressing the flexible element of flexible gear;
First driving mechanism, for output drive strength; And
Second driving mechanism, is connected with the first driving mechanism, and has and to be connected with tensioning actuator and to make the power output part of oscillating motion.
2. flexible drive according to claim 1 low frequency type tension device a little, is characterized in that, described tensioning actuator comprises the guide rod be connected with the power output part of described second driving mechanism and the pinch roller be sheathed on guide rod.
3. flexible drive according to claim 1 and 2 low frequency type tension device a little, it is characterized in that, described second driving mechanism is crankrocker mechanism, and the rocking bar of crankrocker mechanism is as the power output part be connected with described guide rod, and rocking bar does frequency wobbles motion a little.
4. flexible drive according to claim 3 low frequency type tension device a little, it is characterized in that, described first driving mechanism is planetary gears, it central gear comprising the planet carrier be connected with described link rotatable, the planetary pinion be connected with planet carrier, the gear ring engaged with planetary pinion and be arranged at gear ring inner.
5. flexible drive according to claim 4 low frequency type tension device a little, it is characterized in that, described gear ring is coaxially fixedly connected with the follower of flexible gear, and described central gear is for being fixedly installed, and the rotating speed of described planet carrier is less than the rotating speed of gear ring.
6. flexible drive according to claim 5 low frequency type tension device a little, it is characterized in that, described connecting rod is connected with described planet carrier by crank pin, and the axis of crank pin parallels with the axis of planet carrier.
7. flexible drive according to claim 6 low frequency type tension device a little, it is characterized in that, also comprise frame, described rocking bar is connected with gantry rotation.
8. flexible drive according to claim 7 low frequency type tension device a little, it is characterized in that, described first driving mechanism also comprises the center-wheel arbor be arranged in described frame, and described central gear is arranged on center-wheel arbor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520412219.2U CN204692484U (en) | 2015-06-15 | 2015-06-15 | A kind of flexible drive low frequency type tension device a little |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520412219.2U CN204692484U (en) | 2015-06-15 | 2015-06-15 | A kind of flexible drive low frequency type tension device a little |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204692484U true CN204692484U (en) | 2015-10-07 |
Family
ID=54232782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520412219.2U Expired - Fee Related CN204692484U (en) | 2015-06-15 | 2015-06-15 | A kind of flexible drive low frequency type tension device a little |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204692484U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913016A (en) * | 2015-06-15 | 2015-09-16 | 安徽工程大学 | Micro-amplitude low-frequency tensioning device for flexible transmission |
-
2015
- 2015-06-15 CN CN201520412219.2U patent/CN204692484U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913016A (en) * | 2015-06-15 | 2015-09-16 | 安徽工程大学 | Micro-amplitude low-frequency tensioning device for flexible transmission |
| CN104913016B (en) * | 2015-06-15 | 2017-05-24 | 安徽工程大学 | Micro-amplitude low-frequency tensioning device for flexible transmission |
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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: 20151007 Termination date: 20160615 |
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| CF01 | Termination of patent right due to non-payment of annual fee |