CN107061648B - Compact belt tensioning wheel with built-in tensioning mechanism - Google Patents
Compact belt tensioning wheel with built-in tensioning mechanism Download PDFInfo
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- CN107061648B CN107061648B CN201710239125.3A CN201710239125A CN107061648B CN 107061648 B CN107061648 B CN 107061648B CN 201710239125 A CN201710239125 A CN 201710239125A CN 107061648 B CN107061648 B CN 107061648B
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- wheel body
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- supporting block
- tensioning
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- 239000010985 leather Substances 0.000 claims description 16
- 230000002452 interceptive effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
- F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
- F16H7/1209—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/52—Pulleys or friction discs of adjustable construction
- F16H55/54—Pulleys or friction discs of adjustable construction of which the bearing parts are radially adjustable
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
The invention discloses a compact belt tensioning wheel with a built-in tensioning mechanism, and belongs to the technical field of tensioning wheels. The invention relates to a compact belt tensioning wheel with a built-in tensioning mechanism, which comprises a wheel body, wherein a plurality of supporting blocks which can elastically stretch along the radial direction of the wheel body and are limited on the wheel body are uniformly arranged in the circumferential direction of the wheel body, the outer contour of each supporting block is of an arc structure concentric with the wheel body, two telescopic blocks which can elastically stretch at two sides of each supporting block are arranged on each supporting block, and two telescopic blocks which are opposite to each other on two adjacent supporting blocks are propped against each other. According to the invention, the supporting blocks which can elastically stretch along the radial direction of the wheel body and are limited on the wheel body are uniformly arranged in the circumferential direction of the wheel body, and the interactive telescopic blocks are arranged between the supporting blocks.
Description
Technical Field
The present invention relates to a tensioner, and more particularly to a compact belt tensioner incorporating a tensioning mechanism.
Background
In automotive transmissions, belt drives are used in a very wide variety of applications, and it is necessary to install a belt tensioner in order to ensure reliable and efficient transmission. The traditional tensioning wheel functional part (torque providing part) is designed to be hung on a spring supporting sleeve and a supporting plate respectively by two ends of a spring, and a limiting block with certain strength is required to be designed on the spring supporting sleeve and the supporting plate of the tensioning wheel with the structure to be matched with the spring hook (generally, one side is about 5mm, and the diameter direction is 10 mm); the spring support sleeve and the central shaft sleeve are integrated, and the structural size of the central shaft sleeve cannot be designed to be too small in consideration of the strength, so that the radial space requirement is increased. In the accessory gear train, sometimes, the torque provided by the tensioning wheel is larger, and then the diameter of the spring and the integral outer diameter of the spring are required to be considered to be increased, so that the stress concentration at the hooks on two sides during the torsion of the spring is avoided, and the required radial space is increased.
The use of tensioning wheels in the current increasingly compact engine accessory trains is greatly limited due to the influence of the series of factors. To overcome this problem, the conventional approach may improve on this dilemma by using hydraulic tensioners, which are costly. Through searching, there is also a compact tensioning wheel on the market, such as chinese patent No. ZL201520066954.2, the date of the authorized bulletin is 2015, 7, 22, and the invention is named: the application relates to a compact belt tensioning wheel, which comprises a belt pulley and a support plate connected with the belt pulley, wherein a spring support sleeve and a central shaft sleeve are arranged on the support plate, a spring is sleeved in a space formed by the support plate and the spring support sleeve, the spring is a hook-free spring, and limiting blocks respectively abutted with cross sections at the head end and the tail end of the spring are arranged on end faces of the spring support sleeve and the support plate. According to the application, the limiting block is arranged on the support plate through the spring support sleeve, the limiting block is in butt joint with the sections of the two ends of the head of the spring without the hook head, the space of the hook head of the original spring is saved, the diameter of the functional part is reduced, and the spring is applicable to a compact engine accessory gear train. However, the tensioning wheel structure in the application does not fundamentally solve the problem of large occupied space of the traditional tensioning wheel, and the tensioning wheel structure is still fixed on the supporting plate by the rotating part and the tensioning part, occupies relatively small space and is not compact enough. The transmission parts in the automobile are not large, and the required belt is not too long, so that the required tensioning space is not large, and the large-size tensioning device is inconvenient.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects of the existing tensioning wheel, such as bulky structure and large occupied space, and provides the compact belt tensioning wheel with the built-in tensioning mechanism.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention relates to a compact belt tensioning wheel with a built-in tensioning mechanism, which comprises a wheel body, wherein a plurality of supporting blocks which can elastically stretch along the radial direction of the wheel body and are limited on the wheel body are uniformly arranged in the circumferential direction of the wheel body, the outer contour of each supporting block is of an arc structure concentric with the wheel body, two telescopic blocks which can elastically stretch at two sides of each supporting block are arranged on each supporting block, and two opposite telescopic blocks on two adjacent supporting blocks are propped against each other.
Furthermore, the supporting block comprises a telescopic rod and a supporting head, the telescopic rod and the supporting head are integrally formed into a T-shaped structure, the telescopic rod is inserted into a guide groove arranged on the circumference of the wheel body, and a first spring is further arranged in the guide groove; the supporting head is in a circular arc shape concentric with the wheel body.
Furthermore, the supporting heads are provided with through sliding grooves, the telescopic blocks are arranged in the sliding grooves, and a second spring is arranged between the telescopic blocks on two sides of each supporting head.
Furthermore, the sliding groove is of a circular arc-shaped through groove structure concentric with the wheel body.
Further, the outer end surfaces of the opposite telescopic blocks on the two adjacent supporting blocks incline inwards.
Further, the supporting block is limited on the wheel body through an elastic leather sheath sleeved on the outer side of the supporting block.
Furthermore, the front end and the rear end of the supporting block are respectively provided with a baffle, and the elastic leather sheath is limited on the inner sides of the opposite baffles.
Furthermore, the inner sides of the upper ends of the baffle plates at the front end and the rear end of the supporting block incline in opposite directions.
Further, the center of the wheel body is provided with a shaft hole, the rotary drum is arranged in the shaft hole through a bearing, one end of the rotary drum, which extends out of the wheel body, is provided with a fixed disc, and the middle part of the fixed disc is provided with a bolt used for being connected with a fixed object.
Furthermore, the end surface of the fixed disc connected with the fixed object is provided with an anti-skid convex line.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) According to the compact belt tensioning wheel with the built-in tensioning mechanism, the supporting blocks which can elastically stretch along the radial direction of the wheel body and are limited on the wheel body are uniformly arranged in the circumferential direction of the wheel body, and the interactive telescopic blocks are arranged between the supporting blocks;
(2) According to the compact belt tensioning wheel with the built-in tensioning mechanism, the tensioning effect is achieved by means of the fact that the elastic telescopic supporting blocks and the elastic telescopic blocks are matched with each other, so that the mutual correlation effect is formed among the supporting blocks, tensioning transmission is stable and reliable, and running is stable;
(3) The invention relates to a compact belt tensioning wheel with a built-in tensioning mechanism, which comprises a supporting block and supporting heads, wherein the supporting blocks comprise telescopic rods and supporting heads, the telescopic rods are inserted into guide grooves arranged on the periphery of a wheel body, first springs are further arranged in the guide grooves, the supporting heads are provided with through sliding grooves, the telescopic blocks are arranged in the sliding grooves, and second springs are arranged between the telescopic blocks on two sides of each supporting head; the structure is simple, and the manufacture is convenient;
(4) According to the compact belt tensioning wheel with the built-in tensioning mechanism, the telescopic rod and the supporting head are integrally formed into the T-shaped structure, so that the compact belt tensioning wheel is convenient to manufacture and firm;
(5) According to the compact belt tensioning wheel with the built-in tensioning mechanism, the outer end faces of the opposite telescopic blocks on the two adjacent supporting blocks are inclined inwards in opposite directions, so that the upper end faces of the telescopic blocks are enabled to be propped together, and gaps are not generated;
(6) According to the compact belt tensioning wheel with the built-in tensioning mechanism, the supporting blocks are limited on the wheel body through the elastic leather sleeves sleeved on the outer sides of the supporting blocks, so that the belt is not worn in production, a good protection effect is achieved on the belt, and meanwhile, the transmission is stable;
(7) According to the compact belt tensioning wheel with the built-in tensioning mechanism, the baffle plates are arranged at the front end and the rear end of the supporting block, the elastic leather sheath is limited on the inner sides of the opposite baffle plates, and the elastic leather sheath is effectively prevented from sliding out; the inner sides of the upper ends of the baffles at the front end and the rear end of the supporting block incline in opposite directions, so that the belt is convenient to put in and use;
(8) According to the compact belt tensioning wheel with the built-in tensioning mechanism, the center of the wheel body is provided with the shaft hole, the rotary drum is arranged in the shaft hole through the bearing, one end of the rotary drum, which extends out of the wheel body, is provided with the fixed disc, and the middle part of the fixed disc is provided with the bolt for connecting with a fixed object, so that the tensioning wheel is convenient to install and fix; and the end surface of the fixed disc, which is connected with the fixed object, is provided with anti-skid convex lines, so that the friction force is increased, and the tensioning wheel is more firmly and reliably installed.
Drawings
FIG. 1 is a schematic cross-sectional view of a compact belt tensioner of the present invention incorporating a tensioning mechanism;
FIG. 2 is a schematic diagram of a front view of a compact belt tensioner with a built-in tensioning mechanism according to the present invention;
fig. 3 is a schematic rear view of a compact belt tensioner with a built-in tensioning mechanism of the present invention.
Reference numerals in the schematic drawings illustrate:
1. a wheel body; 1-1, a guide groove; 2. a support block; 2-1, a telescopic rod; 2-2, supporting the head; 2-3, sliding grooves; 3. a first spring; 4. a telescopic block; 4-1, an outer end face; 5. a second spring; 6. an elastic leather sheath; 7. a shaft hole; 8. a rotating drum; 9. a bearing; 10. a fixed plate; 11. a bolt; 12. a baffle; 13. anti-slip relief.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples.
Examples
Referring to fig. 1, 2 and 3, a compact belt tensioner with a built-in tensioning mechanism of the present embodiment includes a wheel body 1, a plurality of supporting blocks 2 capable of elastically stretching radially along the wheel body 1 and being limited on the wheel body 1 are uniformly mounted in the circumferential direction of the wheel body 1, the outer contour of the supporting blocks 2 is of a circular arc structure concentric with the wheel body 1, that is, the circle center of the outer contour of the supporting blocks 2 points to the center of the wheel body 1, two stretching blocks 4 capable of elastically stretching at two sides of the supporting blocks 2 are provided on each supporting block 2, and two opposite stretching blocks 4 on two adjacent supporting blocks 2 are propped against each other. Like this, utilize can provide the tensioning effect along the radial elastic telescopic supporting shoe 2 of wheel body 1, utilize flexible piece 4 to realize the interrelation effect between each supporting shoe 2 simultaneously, compare with current take-up pulley, take-up pulley's straining device is installed on wheel body 1, as a whole, makes take-up pulley self have built-in straining device, the structure is very simple compact, occupation space does not be favorable to the application in compact engine accessory train, and tensioning transmission is more reliable and more stable in operation.
Continuing with FIG. 1, the supporting block 2 in this embodiment comprises a telescopic rod 2-1 and a supporting head 2-2, the telescopic rod 2-1 and the supporting head 2-2 are integrally formed into a T-shaped structure, and the supporting block 2 adopts an integral structure, so that the manufacturing is facilitated, and the supporting block is stronger; the wheel body 1 is circumferentially and uniformly provided with guide grooves 1-1 pointing to the center of the wheel body 1, the telescopic rod 2-1 is inserted into the guide grooves 1-1 arranged in the circumferential direction of the wheel body 1, the guide grooves 1-1 are internally provided with first springs 3, and the first springs 3 are utilized to provide the tensioning function of the supporting blocks 2; the supporting heads 2-2 are circular arcs concentric with the wheel body 1, and the outer contour of each supporting head 2-2 forms a circle concentric with the wheel body 1. The supporting heads 2-2 are provided with the penetrating sliding grooves 2-3, the telescopic blocks 4 are arranged in the sliding grooves 2-3, a second spring 5 is arranged between the telescopic blocks 4 on two sides of each supporting head 2-2, the elastic telescopic function of the telescopic blocks 4 is realized by using the second springs 5, and the supporting blocks 2 are connected through the telescopic blocks 4, so that the tensioning force is ensured to be uniform and stable, and the transmission stability of the tensioning wheel is improved. The sliding groove 2-3 is of a circular arc-shaped through groove structure concentric with the wheel body 1, namely, the circle center of the sliding groove 2-3 points to the center of the wheel body 1, and the telescopic block 4 stretches and contracts in the sliding groove 2-3 more smoothly. In addition, in the embodiment, the outer end faces 4-1 of the opposite telescopic blocks 4 on the two adjacent supporting blocks 2 incline inwards in opposite directions to form a V-shaped notch which is opened inwards, so that the upper end faces of the telescopic blocks 4 are propped together, and no gap is generated.
As shown in fig. 1, 2 and 3, in this embodiment, the supporting blocks 2 are limited on the wheel body 1 by the elastic leather sheath 6 sleeved on the outer side of the supporting blocks, and the elastic leather sheath 6 is used to connect the step gaps between the supporting blocks 2, so that the belt is not worn, the belt is well protected, and the transmission is more stable. The elastic rubber sheath 6 is preferably an elastic rubber sheath. The baffle plates 12 are arranged at the front end and the rear end of the supporting block 2, and the upper end of the baffle plate 12 is slightly higher than the elastic leather sheath 6, so that the elastic leather sheath 6 is limited at the inner side of the opposite baffle plates 12, and the elastic leather sheath 6 is effectively prevented from sliding out. In addition, the inner sides of the upper ends of the baffles 12 at the front and rear ends of the supporting block 2 are inclined in opposite directions, so that the belt can be conveniently put in and used.
Referring to fig. 1 to 3, the center of the wheel body 1 in this embodiment is provided with a shaft hole 7, a rotary drum 8 is mounted in the shaft hole 7 through a bearing 9, one end of the rotary drum 8 extending out of the wheel body 1 is provided with a fixed disc 10, the middle part of the fixed disc 10 is provided with a bolt 11 for connecting with a fixed object, so that the tensioning wheel is convenient to mount and fix, and the connection is convenient. The end face of the fixed disc 10 connected with the fixed object is provided with an anti-skid convex line 13, so that friction force is increased, and the tensioning wheel is more firmly and reliably installed.
In the compact belt tensioning wheel with the built-in tensioning mechanism, a belt passes through the upper end of the supporting block 2, the belt downwards presses the supporting block 2, and the first spring 3 in the supporting block 2 is compressed, so that the supporting and tensioning functions are achieved; the adjacent two supporting blocks 2 are connected through the telescopic blocks 4, the step gap between the telescopic blocks 4 and the supporting blocks 2 is connected through the outer elastic leather sheath 6, and the belt is pressed on the elastic leather sheath 6, so that the belt cannot be worn during production, and meanwhile, the transmission is stable.
Compared with the existing tensioning wheel, the compact belt tensioning wheel with the built-in tensioning mechanism has the advantages that the supporting block is used for providing the function of supporting and tensioning the belt, so that the tensioning wheel is provided with the built-in tensioning mechanism, the structure is very simple and compact, the space is not occupied, the compact belt tensioning wheel is beneficial to being applied in a compact engine accessory wheel train, tensioning transmission is more stable and reliable, and the operation is more stable; simple structure and convenient manufacture.
The invention and its embodiments have been described above schematically, without limitation, and the actual construction is not limited to this, as it is shown in the drawings, which are only one of the embodiments of the invention. Therefore, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical scheme are not creatively devised without departing from the gist of the present invention, and all the structural manners and the embodiments belong to the protection scope of the present invention.
Claims (5)
1. A compact belt tensioner of built-in straining device, its characterized in that: the novel wheel comprises a wheel body (1), wherein a plurality of supporting blocks (2) which can elastically stretch out and draw back along the radial direction of the wheel body (1) and are limited on the wheel body (1) are uniformly arranged in the circumferential direction of the wheel body (1), the outer outline of each supporting block (2) is of a circular arc structure concentric with the wheel body (1), two telescopic blocks (4) which can elastically stretch out and draw back at two sides of each supporting block (2) are arranged on each supporting block (2), and two opposite telescopic blocks (4) on two adjacent supporting blocks (2) are propped against each other;
the supporting block (2) comprises a telescopic rod (2-1) and a supporting head (2-2), the telescopic rod (2-1) and the supporting head (2-2) are integrally formed into a T-shaped structure, the telescopic rod (2-1) is inserted into a guide groove (1-1) arranged in the circumferential direction of the wheel body (1), and a first spring (3) is further arranged in the guide groove (1-1); the supporting head (2-2) is in a circular arc shape concentric with the wheel body (1);
the support heads (2-2) are provided with through sliding grooves (2-3), the telescopic blocks (4) are arranged in the sliding grooves (2-3), and a second spring (5) is arranged between the telescopic blocks (4) at two sides of each support head (2-2);
the supporting block (2) is limited on the wheel body (1) through an elastic leather sheath (6) sleeved on the outer side of the supporting block; the front end and the rear end of the supporting block (2) are respectively provided with a baffle (12), and the elastic leather sheath (6) is limited at the inner sides of the opposite baffles (12), so that the elastic leather sheath (6) is effectively prevented from sliding out; the inner sides of the upper ends of the baffle plates (12) at the front end and the rear end of the supporting block (2) incline towards opposite directions, so that the belt can be conveniently put in.
2. A compact belt tensioner incorporating a tensioning mechanism as claimed in claim 1, wherein: the sliding groove (2-3) is of a circular arc-shaped through groove structure concentric with the wheel body (1).
3. A compact belt tensioner incorporating a tensioning mechanism as claimed in claim 2, wherein: the outer end surfaces (4-1) of the opposite telescopic blocks (4) on the two adjacent supporting blocks (2) incline inwards in opposite directions.
4. A compact belt tensioner incorporating a tensioning mechanism as claimed in claim 1, wherein: the center of wheel body (1) be equipped with shaft hole (7), install rotary drum (8) through bearing (9) in shaft hole (7), the one end that rotary drum (8) stretched out wheel body (1) is equipped with fixed disk (10), the middle part of fixed disk (10) is equipped with bolt (11) that are used for being connected with the fixture.
5. A compact belt tensioner incorporating a tensioning mechanism as claimed in claim 4, wherein: the end face of the fixed disc (10) connected with the fixed object is provided with an anti-slip convex line (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710239125.3A CN107061648B (en) | 2017-04-13 | 2017-04-13 | Compact belt tensioning wheel with built-in tensioning mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710239125.3A CN107061648B (en) | 2017-04-13 | 2017-04-13 | Compact belt tensioning wheel with built-in tensioning mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107061648A CN107061648A (en) | 2017-08-18 |
| CN107061648B true CN107061648B (en) | 2023-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710239125.3A Active CN107061648B (en) | 2017-04-13 | 2017-04-13 | Compact belt tensioning wheel with built-in tensioning mechanism |
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| Country | Link |
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| CN (1) | CN107061648B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108708949B (en) * | 2018-07-11 | 2021-06-15 | 西北工业大学 | Transmission capable of realizing stepless speed change through electromechanical actuation |
| CN109185429A (en) * | 2018-09-25 | 2019-01-11 | 芜湖新兴铸管有限责任公司 | Anti-skidding runner |
| CN110630706A (en) * | 2019-10-11 | 2019-12-31 | 吉林大学 | Self-adaptive tension sprocket |
| CN111038930B (en) * | 2019-12-20 | 2022-06-17 | 合肥职业技术学院 | Belt conveyor with integrated tensioning transmission wheels |
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| FR691714A (en) * | 1930-03-11 | 1930-10-24 | American Mach & Foundry | Extendable pulleys improvements |
| CN1601142A (en) * | 2003-09-26 | 2005-03-30 | 坂东化学株式会社 | Drive belt pulley and belt drive system |
| CN205278260U (en) * | 2015-12-31 | 2016-06-01 | 温州博立汽车科技有限公司 | High damping belt tensioner |
| CN106352033A (en) * | 2016-10-12 | 2017-01-25 | 华南理工大学 | Variable stiffness automatic belt-tensioning device |
| CN206668888U (en) * | 2017-04-13 | 2017-11-24 | 常州工程职业技术学院 | A kind of compact tension pulley of built-in strainer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005036206A1 (en) * | 2005-08-02 | 2007-02-08 | Schaeffler Kg | traction mechanism |
| DE102011053869B4 (en) * | 2011-09-22 | 2020-03-26 | Muhr Und Bender Kg | Belt tensioning device for a belt drive and assembly arrangement with belt tensioning device |
| DE102014206716A1 (en) * | 2014-04-08 | 2015-10-08 | Muhr Und Bender Kg | Belt tensioner |
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2017
- 2017-04-13 CN CN201710239125.3A patent/CN107061648B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR691714A (en) * | 1930-03-11 | 1930-10-24 | American Mach & Foundry | Extendable pulleys improvements |
| CN1601142A (en) * | 2003-09-26 | 2005-03-30 | 坂东化学株式会社 | Drive belt pulley and belt drive system |
| CN205278260U (en) * | 2015-12-31 | 2016-06-01 | 温州博立汽车科技有限公司 | High damping belt tensioner |
| CN106352033A (en) * | 2016-10-12 | 2017-01-25 | 华南理工大学 | Variable stiffness automatic belt-tensioning device |
| CN206668888U (en) * | 2017-04-13 | 2017-11-24 | 常州工程职业技术学院 | A kind of compact tension pulley of built-in strainer |
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| CN107061648A (en) | 2017-08-18 |
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