CN117605798A - Tensioning wheel with asymmetric tension - Google Patents
Tensioning wheel with asymmetric tension Download PDFInfo
- Publication number
- CN117605798A CN117605798A CN202311823573.XA CN202311823573A CN117605798A CN 117605798 A CN117605798 A CN 117605798A CN 202311823573 A CN202311823573 A CN 202311823573A CN 117605798 A CN117605798 A CN 117605798A
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- China
- Prior art keywords
- swing arm
- damping
- base
- damping ring
- tensioner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000013016 damping Methods 0.000 claims abstract description 120
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 239000002356 single layer Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013589 supplement Substances 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
- F16H7/1218—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means of the dry friction type
-
- 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
- F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
- F16H7/0831—Means for varying tension of belts, ropes, or chains with vibration damping means of the dry friction type
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- 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 tension pulley with asymmetric tension is used for biasing a transmission part in a transmission system and comprises a fixed base, a swing arm which is matched with the base and can swing around an axis, a biasing swing arm is arranged between the base and the swing arm, an elastic part which enables the swing arm to have a deflection trend towards the transmission part is arranged between the base and the swing arm, one end of the swing arm far away from the axis is provided with a belt pulley which is biased to the transmission part, and the tension pulley also comprises a damping assembly which comprises a damping ring and a thrust piece, wherein the damping ring is provided with a friction surface which is in friction fit with one of the swing arm and the base; the thrust piece is circumferentially fixed with the other one of the swing arm or the base; when the damping ring swings around the first direction relative to the thrust piece, the thrust piece is separated from the damping ring; when the damping ring swings around the second direction relative to the thrust piece, the thrust piece and the damping ring apply acting force to the damping ring through the inclined plane, so that acting force between a friction surface of the damping ring and the swing arm or the base is increased, and damping between the swing arm and the base is further increased.
Description
Technical Field
The invention relates to a tensioning wheel with asymmetric tension.
Background
Most internal combustion engines for automobiles and the like include belt driven accessory systems that are necessary for proper operation of the vehicle. The accessory systems may include an alternator, an air conditioning compressor, a power steering pump, and the like.
The accessory system is typically mounted at the front end of the engine. Each accessory has a pulley mounted on a shaft for receiving power from a belt drive. For proper operation, the belt is installed with a predetermined tension. When in operation, it stretches slightly beyond its length. This will result in a decrease in belt tension, which may cause the belt to slip. Thus, the belt tensioner is used to maintain proper belt tension as the belt stretches during use.
In addition, when the belt tensioner is operated, the operating belt may excite vibrations in the tension spring. These vibrations are undesirable because they can cause belt and tensioner wear and vibration and noise of the system. Therefore, a damping mechanism is added to the tensioning sheave to damp vibrations during operation.
There is a need for a tensioner with asymmetric damping that can have a greater damping force in the loading direction than in the unloading direction.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a tensioning wheel with asymmetric tension, which can have a larger damping force in the loading direction than in the unloading direction.
To solve the above technical problem, the present disclosure provides a tensioner having asymmetric tension for biasing a driving member in a driving system and providing asymmetric tension, including a base fixed relative to a mounting surface of the tensioner, a swing arm mated with the base and swingable about an axis, an elastic member provided between the base and the swing arm, the elastic member biasing the swing arm to have a tendency to deflect toward the driving member, one end of the swing arm away from the axis being provided with a pulley biased to the driving member, and a damping assembly including a swingable damping ring provided with a plurality of first bevel teeth, the damping ring being provided with a friction surface that is frictionally mated with one of the swing arm or the base; the damping assembly further comprises a thrust piece which is circumferentially fixed with the other one of the swing arm or the base, a plurality of second bevel gears corresponding to the first bevel gear of the damping ring are arranged on the thrust piece, and the first bevel gear and the second bevel gear are respectively provided with a first bevel and a second bevel and a first stop surface and a second stop surface corresponding to the first bevel and the second bevel; when the damping ring swings around the first direction relative to the thrust piece, the second inclined surface of the thrust piece is separated from the first inclined surface of the damping ring, and the first stop surface and the second stop surface move towards each other; when the damping ring swings around the second direction relative to the thrust piece, the second inclined plane of the thrust piece is combined with the first inclined plane of the damping ring, and acting force is applied to the damping ring through the inclined plane, so that acting force between a friction surface of the damping ring and the swing arm or the base is increased, and damping between the swing arm and the base is further increased.
The beneficial effect of this creation lies in: in the loading direction, larger damping can be generated by the combined action of the damping ring and the inclined plane on the thrust piece; in the unloading direction, the damping ring is separated from the inclined surface of the thrust piece, and the damping is reduced.
Drawings
Fig. 1 is an exploded schematic view of the present tensioner with asymmetric tension.
Fig. 2 is a schematic cross-sectional view of the tensioning wheel with asymmetric tension in the present invention.
Detailed Description
The asymmetric tension tensioner of the present invention will be described in detail with reference to fig. 1-2.
A tensioner having an asymmetric tension for biasing a drive member in a drive train, while providing an asymmetric tension.
The tensioner comprises a base 1 fixed relative to a tensioner mounting surface, which is typically a mounting plane on an engine or mounting bracket; a swing arm 2 for cooperating with the base 1 and being swingable about an axis, which is normally perpendicular to said mounting plane; one end of the swing arm 2 far away from the axis is provided with a belt wheel 3 biased to the transmission member, the belt wheel 3 can rotate around the other axis, and the axis is offset from the swing axis of the swing arm 2; an elastic member 5 is disposed between the base 1 and the swing arm 2, the elastic member 5 biases the swing arm 2 to have a tendency to deflect toward the driving belt, and the elastic member 5 may be a coiled torsion spring, a belt coil spring or a coiled compression spring, or may be any other various options conventionally used in the art, and referring to fig. 1, in this embodiment, the elastic member 5 is a coiled torsion spring. Referring to fig. 1, there is also provided a connection shaft 6, one end of the connection shaft 6 is fixed to the base 1, and the other end is pivotably connected to the swing arm 2 through a bushing, i.e., the swing arm 2 is swingable about the connection shaft 6. In other embodiments, the swing arm 2 and the base 1 may be connected by other connection means, for example, one of the swing arm 2 or the base 1 is provided with a rotation shaft, through which the other of the swing arm 2 or the base 1 is pivotably connected. Or the swing arm 2 or the base 1 is respectively provided with a rotating shaft, and the two rotating shafts are sleeved in a mutually pivotable way. These are common arrangements in the art, and other common structures are not described in detail herein, and can be applied to the present creation.
The tensioner further comprises a damping assembly 8, 9, said damping assembly 8, 9 comprising a swingable damping ring 8 provided with a plurality of first bevel teeth 81, the damping ring 8 being provided with a friction surface 84, said friction surface 84 being in friction fit with one of the swing arm 2 or the base 1. In a preferred embodiment, the damping ring 8 is C-shaped, the friction surface 84 of the damping ring 8 is a radially outer surface thereof, one of the swing arm 2 or the base 1 is provided with a damping surface cooperating with the friction surface 84, and referring to fig. 1, in this embodiment, the damping surface 21 is provided on the swing arm 2. The opening of the C-shaped damping ring 8 may be connected by a thin connector (not shown) to maintain the integrity of the damping ring 8. Preferably, in the relaxed state, the diameter of the damping ring 8 is greater than the inner diameter of the damping surface 21, the damping ring 8 being pre-shrunk fit onto the damping surface 21. It is also possible to provide that the diameter of the damping ring 8 is smaller than the inner diameter of the damping surface 21, and that the damping ring 8 is pressed against the damping surface 21 after expansion.
The damping ring 8 may have a single-layer structure or a multi-layer structure. In the single-layer structure, the first bevel gear 81 on the radial inner side and the friction surface 84 on the radial outer side of the damping ring 8 are integrally provided. In the multilayer structure, the damper ring 8 includes a first beveled tooth 81 on the radially inner side, a friction surface 84 on the radially outer side, and an elastic layer (not shown) provided between the first beveled tooth 81 and the friction surface 84. Optionally, the elastic layer is a strip-shaped metal sheet. The first bevel gear 81 and the friction surface 84 may be made of the same material and integrally formed with the resilient layer. Alternatively, the first beveled teeth 81 and the friction surface 84 may be formed of different materials and assembled to form the damping ring 8. It can be seen that the first bevel gear 81, the friction surface 84, and the elastic layer may be made of the same or different materials, and the first bevel gear 81, the friction surface 84, and the elastic layer may be integrally formed, or may be partially integrally formed, and may be assembled with the other member to form the damping ring 8, or may be completely assembled to form the damping ring 8.
The damping assembly 8, 9 further comprises a thrust piece 9 fixed circumferentially to the other of the swing arm 2 or the base 1, the thrust piece 9 being provided with a plurality of second bevel teeth 91 corresponding to the first bevel teeth 81 of the damping ring 8. The thrust piece 9 may be preferably integrally formed with the other of the swing arm 2 or the base 1, or the thrust piece 9 may be separately disposed relative to the other of the swing arm 2 or the base 1, for example, the thrust piece 9 and the other of the swing arm 2 or the base 1 are respectively provided with a positioning hole and a positioning column, which cooperate to realize circumferential positioning of the thrust piece 9 relative to the other of the swing arm 2 or the base 1.
The first and second bevel gears 81 and 91 are provided with first and second bevel gears 82 and 92, respectively, and first and second stopper surfaces 83 and 93 corresponding to the first and second bevel gears 82 and 92, respectively. When the damping ring 8 swings relative to the thrust member 9 about the first direction, referring to fig. 2, the first direction is clockwise in the drawing, the second inclined surface 92 of the thrust member 9 is separated from the first inclined surface 82 of the damping ring 8, and the first and second stop surfaces 83 and 93 move towards each other, alternatively, the first and second stop surfaces 83 and 93 are close to each other but not in contact with each other, and at this time, damping is still generated at the rotation shaft of the swing arm 2 and the base 1; preferably, the first and second stop surfaces 83, 93 may be designed to abut, where the second stop surface 93 abuts the first stop surface 83, and the thrust member 9 pushes the damping ring 8 to rotate clockwise or rotate clockwise, thereby generating damping. When the damping ring 8 swings around the second direction relative to the thrust member 9, referring to fig. 2, that is, when the damping ring 8 rotates around the counterclockwise direction, the second inclined surface 92 of the thrust member 9 is combined with the first inclined surface 82 of the damping ring 8, and an acting force is applied to the damping ring 8 by the inclined surface, so that the acting force between the friction surface 84 of the damping ring 8 and the swing arm 2 or the base 1 is increased, and further, the damping between the swing arm 2 and the base 1 is increased. When the damping ring 8 rotates in a counterclockwise direction, the damping force generated by the damping ring is far greater than that generated by the damping ring 8 rotating clockwise, so that the damping forces generated by the tensioning wheel with the damping assembly in different swinging directions of the swing arm 2 are far different.
As previously mentioned, the friction surface 84 is preferably disposed on the radially outer surface of the damping ring 8, and in alternative embodiments, the friction surface may be disposed on the radially inner surface of the damping ring, with corresponding beveled teeth of the damping ring disposed on the radially outer surface of the damping ring, and the thrust member disposed radially outwardly of the damping ring. The swing arm and the base are correspondingly adjusted based on the above structure, and are not described in detail herein.
In the foregoing embodiment, the friction surface 84 is provided on the radially outer side surface of the damper ring 8. In an alternative embodiment, the friction surface of the damping ring 8 may also be provided on its axial end side surface, and one of the swing arm 2 or the base 1 is provided with a damping surface provided on the axial end side that cooperates with the friction surface. The damping ring 8 supported by the axial force can cooperate with the damping surface on the axial end side to produce damping. The axial force can be the axial force generated by a spiral torsion spring, and the axial support of the damping ring can be realized through an elastic support piece which is arranged independently, for example, a wave spring, a belleville spring and the like can be arranged.
The number of the first bevel gear and the second bevel gear is designed according to the sizes of different tensioning wheels, and preferably, the number of the first bevel gear or the second bevel gear is more than 6.
Optionally, a damping block is further disposed between the swing arm 2 and the base 1, and the damping block is designed according to a conventional tensioning wheel damping block, and may be in various forms, such as a block, a belt, or other forms, and is fixed relative to one of the swing arm or the base, and abuts against the other to generate relative motion, so as to generate damping. The damping block may be a supplement to the damping assembly of the present creation, acting in concert with the damping assembly of the present creation.
The above technical solution is only illustrative of the present embodiment of the present creation, and not limiting the present creation, and all equivalent changes made by those skilled in the art according to the present creation belong to the protection scope of the present creation.
Claims (13)
1. A tensioner having asymmetric tension for biasing a drive member in a drive train and providing an asymmetric tension includes
A base fixed relative to the mounting surface of the tensioning wheel,
a swing arm which is matched with the base and can swing around the axis,
an elastic piece is arranged between the base and the swing arm, the elastic piece biases the swing arm to enable the swing arm to have a tendency of deflecting towards the transmission piece,
one end of the swing arm far away from the axis is provided with a belt wheel which is biased to the transmission piece, and is characterized in that,
the damping assembly comprises a swingable damping ring provided with a plurality of first bevel teeth, and the damping ring is provided with a friction surface which can be in friction fit with one of the swing arm or the base;
the damping assembly further comprises a thrust piece which is circumferentially fixed with the other one of the swing arm or the base, a plurality of second bevel gears corresponding to the first bevel gear of the damping ring are arranged on the thrust piece, and the first bevel gear and the second bevel gear are respectively provided with a first bevel and a second bevel and a first stop surface and a second stop surface corresponding to the first bevel and the second bevel;
when the damping ring swings around the first direction relative to the thrust piece, the second inclined surface of the thrust piece is separated from the first inclined surface of the damping ring, and the first stop surface and the second stop surface move towards each other;
when the damping ring swings around the second direction relative to the thrust piece, the second inclined plane of the thrust piece is combined with the first inclined plane of the damping ring, and acting force is applied to the damping ring through the inclined plane, so that acting force between a friction surface of the damping ring and the swing arm or the base is increased, and damping between the swing arm and the base is further increased.
2. The tensioner with asymmetric tension as in claim 1, wherein: an elastic piece which can be a spiral torsion spring or a belt spring is arranged between the base and the swing arm.
3. The tensioner with asymmetric tension as in claim 1, wherein: the damping ring is C-shaped, the friction surface of the damping ring is the radial outer side surface of the damping ring, one of the swing arm or the base is provided with a damping surface matched with the friction surface, and the first inclined plane teeth and the second inclined plane teeth are respectively arranged on the radial side surfaces of the damping ring and the thrust piece.
4. A tensioner as claimed in claim 3, having asymmetric tension, wherein: the diameter of the damping ring is larger than the inner diameter of the damping surface, and the damping ring is in pre-shrinking fit on the damping surface.
5. The tensioner as in claim 4, having asymmetric tension, wherein: when the damping ring swings around the first direction relative to the thrust piece, the first stop surface and the second stop surface are abutted, and the thrust piece pushes the damping ring to rotate clockwise or rotate clockwise.
6. A tensioner as claimed in claim 3, having asymmetric tension, wherein: the number of the first bevel gear and the second bevel gear is more than 6.
7. A tensioner as claimed in claim 3, having asymmetric tension, wherein: the damping ring is of a multi-layer structure and comprises first inclined plane teeth on the inner side in the radial direction, a friction surface on the outer side in the radial direction and an elastic layer arranged between the first inclined plane teeth and the friction surface.
8. The tensioner as in claim 7, having asymmetric tension, wherein: the elastic layer is a strip-shaped metal sheet.
9. A tensioner as claimed in claim 3, having asymmetric tension, wherein: the friction surface of the radial inner side first inclined plane tooth and the radial outer side surface of the damping ring is integrally arranged.
10. The tensioner with asymmetric tension as in claim 1, wherein: and a damping block is further arranged between the swing arm and the base, and the damping block generates damping with the swing arm or the base along with the swing of the swing arm.
11. The tensioner with asymmetric tension as in claim 1, wherein: the thrust plate is integrally arranged with the other one of the swing arm or the base.
12. The tensioner with asymmetric tension as in claim 1, wherein: the thrust plate is arranged independently relative to the other one of the swing arm or the base, and the other one of the thrust plate and the swing arm or the base is respectively provided with a positioning hole and a positioning column which are matched with each other to realize the circumferential positioning of the thrust plate relative to the other one of the swing arm or the base.
13. The tensioner with asymmetric tension as in claim 1, wherein: the friction surface of the damping ring is an axial end surface, and one of the swing arm or the base is provided with a damping surface matched with the friction surface and arranged at the axial end side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311823573.XA CN117605798A (en) | 2023-12-28 | 2023-12-28 | Tensioning wheel with asymmetric tension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311823573.XA CN117605798A (en) | 2023-12-28 | 2023-12-28 | Tensioning wheel with asymmetric tension |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117605798A true CN117605798A (en) | 2024-02-27 |
Family
ID=89944476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311823573.XA Pending CN117605798A (en) | 2023-12-28 | 2023-12-28 | Tensioning wheel with asymmetric tension |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117605798A (en) |
-
2023
- 2023-12-28 CN CN202311823573.XA patent/CN117605798A/en active Pending
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