CN107387693B - Belt tensioner with unidirectional high damping automatic compensation - Google Patents
Belt tensioner with unidirectional high damping automatic compensation Download PDFInfo
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- CN107387693B CN107387693B CN201710860013.XA CN201710860013A CN107387693B CN 107387693 B CN107387693 B CN 107387693B CN 201710860013 A CN201710860013 A CN 201710860013A CN 107387693 B CN107387693 B CN 107387693B
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- base
- friction ring
- spring
- damping
- belt
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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
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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
- F16H2007/0802—Actuators for final output members
- F16H2007/0806—Compression coil springs
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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 invention relates to a belt tensioner with unidirectional high damping automatic compensation, which is characterized by comprising a base, a pin shaft, a tensioning arm, a spiral spring, a damping spring and a friction ring, wherein the damping spring is a spiral torsion spring; when the damping spring is twisted and the outer diameter is enlarged, the friction ring is spread to be attached to the inner wall of the base to compensate the abrasion of the friction ring, and meanwhile, the outer wall of the friction ring and the inner wall of the base relatively slide to generate friction damping to absorb vibration from an engine belt. The invention has simple and compact structure, effectively compensates abrasion of the friction member, ensures constant friction damping output by the tensioner in the whole working life and stable working state, and prolongs the service life of the tensioner.
Description
Technical Field
The present invention relates to a belt tensioner that maintains belt tension and absorbs vibrations in an automotive engine, and more particularly to a belt tensioner with unidirectional high damping auto-compensation.
Background
The automatic tensioner of the automobile engine belt is widely applied to an automobile engine and is used for maintaining the tension of the automobile engine belt and absorbing vibration, so that the transverse vibration in the belt running process can be effectively solved, and the energy consumption of the engine is saved. Such tensioners typically include a pulley or other member that is driven against the engine belt by a spring or other drive means, the pulley being bearing mounted on a rotating tensioner arm that revolves about a cup-shaped base that houses the spring or other drive means that drives the rotating tensioner arm in rotation to maintain a constant tension on the engine belt. Conventional tensioners also include a circular friction member that provides friction damping to the automatic tensioner as the rotating tensioner arm turns, thereby dampening or absorbing vibrations of the tensioner arm.
Although such belt automatic tensioners are widely used, they suffer from a number of drawbacks. In particular, since the friction member is required to provide a large friction damping for the tensioner and is required to be constant, it is common that the friction damping plate is worn, and this wear may cause a change in the friction surface, and an inconsistency between the state of the friction surface at the initial stage of use and the state at the later stage of use may cause an unstable friction damping output, and eventually cause an engine belt slip or early failure, thereby shortening the service life of the tensioner.
Disclosure of Invention
The applicant has made research and improvement to the above problems, and provides a belt tensioner with unidirectional high damping automatic compensation, which has a simple and compact structure and low manufacturing cost, effectively compensates abrasion of friction members, ensures constant friction damping output by the tensioner during the whole working life and stable working state, and prolongs the service life of the tensioner.
In order to solve the technical problems, the invention adopts the following technical scheme:
a belt tensioner with unidirectional high damping auto-compensation comprising:
a base which is a cup-shaped member with an opening;
the pin shaft is coaxially arranged in the base, and the lower end of the pin shaft is rotatably arranged at the bottom of the base;
one end part of the tensioning arm is covered at the opening of the base and is fixedly connected with the upper end of the pin shaft, and the other end part of the tensioning arm is provided with a rotatable belt pulley which is attached to an engine belt;
the spiral spring is a spiral torsion spring and is coaxially arranged in the base with the pin shaft, one end of the spiral spring is connected with the base, the other end of the spiral spring is connected with the tensioning arm, and the spiral spring drives the tensioning arm to rotate around the pin shaft so that a belt pulley on the tensioning arm is attached to an engine belt;
the damping spring and the friction ring are coaxially sleeved outside the spiral spring, the upper end of the damping spring is clamped in a clamping groove on the tensioning arm, and the outer wall of the friction ring is in sliding contact with the inner wall of the base;
when the tensioning arm rotates to enable the belt pulley to be attached to the engine belt, when the damping spring is twisted to enable the outer diameter to be large, the friction ring is unfolded to be attached to the inner wall of the base to compensate abrasion of the friction ring, and meanwhile the outer wall of the friction ring and the inner wall of the base slide relatively to generate friction damping to absorb vibration from the engine belt.
Further:
the damping spring has a rectangular cross section.
The outer wall of the friction ring is provided with a taper.
The spiral spring and the damping spring are right spiral springs.
The spiral spring is a spiral spring with two ends without bent legs, an upper stop block is arranged on the tensioning arm, a lower stop block is arranged at the bottom of the base, one end of the spiral spring abuts against the upper stop block, and the other end of the spiral spring abuts against the lower stop block.
A plurality of axial grooves are symmetrically arranged on the outer wall of the friction ring.
And a labyrinth seal is arranged at the assembling surface of the base and the tensioning arm.
The invention has the technical effects that:
the belt tensioner with the unidirectional high damping automatic compensation function has the advantages that the structure is simple and compact, the manufacturing cost is low, the damping spring is adopted to effectively compensate abrasion of the friction member, the constancy of the friction damping output by the tensioner in the whole working life and the stability of the working state are ensured, and the service life of the tensioner is prolonged.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a three-dimensional exploded view of the present invention.
Fig. 3 is a schematic three-dimensional structure of the friction ring.
Fig. 4 is a schematic three-dimensional structure of the tensioner arm.
Fig. 5 is a schematic three-dimensional structure of the base.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
As shown in fig. 1-4, the invention comprises a base 1, a pin shaft 2, a tensioning arm 7, a belt pulley 9, a spiral spring 3, a damping spring 5 and a friction ring 6, wherein the base 1 is a cup-shaped member with an opening, the pin shaft 2 is coaxially arranged in the base 1, the lower end of the pin shaft 2 is rotatably arranged at the bottom of the base 1 through 2 bushing 4, the bushing 4 is a cylindrical ring member with a flanging at one end, an inner hole of the bushing 4 is provided with a wear-resistant coating, the inner hole of the bushing 4 is in clearance fit with the pin shaft 2, interference fit is arranged between the base 1 and the bushing 4, and the flanging of the bushing 4 and the end face of the pin shaft 2 are matched to play a role of a plane bearing. One end of the tensioning arm 7 covers the opening of the base 1, the tensioning arm 7 is fixedly connected to the upper end of the pin shaft 2 through interference fit, a rotatable belt pulley 9 attached to an engine belt is arranged at the other end of the tensioning arm 7, the belt pulley 9 is rotatably connected with the tensioning arm 7 through a bearing 8, a bolt 11 and a dust cover 10, the dust cover 10 is used for preventing dust of the bearing 8, a labyrinth seal 12 is arranged at the assembling surface of the base 1 and the tensioning arm 7, and the labyrinth seal 12 can prevent dust, engine oil and the like from entering the base 1. The coil spring 3 is a spiral torsion spring, the coil spring 3 and the pin shaft 2 are coaxially arranged in the base 1, one end of the coil spring 3 is connected with the base 1, the other end of the coil spring 3 is connected with the tensioning arm 7, in the embodiment, the coil spring 3 is a coil spring with two ends free of bending feet, an upper stop block 72 is arranged on the tensioning arm 7, a lower stop block 101 is arranged at the bottom of the base 1, one end of the coil spring 3 abuts against the upper stop block 72, the other end of the coil spring 3 abuts against the lower stop block 101, and the coil spring 3 drives the tensioning arm 7 to rotate around the pin shaft 2 so that a belt pulley 9 on the tensioning arm 7 is attached to an engine belt. The damping spring 5 is a spiral torsion spring, the spiral direction of the damping spring 5 and the spiral direction of the spiral spring 3 can be left-handed or right-handed, and the spiral spring 3 and the damping spring 5 are both right-handed spiral springs according to actual needs. The friction ring 6 is in a thin-wall cylinder shape and made of engineering nylon materials, an outward-turned upper flange 63 is arranged at the upper end of the friction ring 6 and used for positioning the friction ring 6, an inward-turned lower flange 64 is arranged at the lower end of the friction ring 6, an axial fracture 62 is arranged on the friction ring 6, the damping spring 5 is pretensioned in the friction ring 6, the damping spring 5 and the friction ring 6 are coaxially sleeved outside the spiral spring 3, the upper end of the damping spring 5 is clamped in a clamping groove 71 on the tensioning arm 7, the lower end of the damping spring 5 is a free end and blocked by the lower flange 64 of the friction ring 6, the outer wall of the friction ring 6 is in sliding contact with the inner wall of the base 1, the outer diameter of the damping spring 5 is slightly larger than the inner diameter of the friction ring 6 in an independent state before assembly, after the damping spring 5 is installed in the friction ring 6, the friction ring 6 is provided with the axial fracture 62, the friction ring 6 can be tightly attached to the inner wall of the base 1 by the pretensioning force after the damping spring 5 is installed in, and abrasion of the friction ring 6 is compensated in real time. The outer wall of the friction ring 6 is symmetrically provided with a plurality of axial grooves 61, the grooves 61 are used for containing abrasive dust generated by abrasion of the friction ring 6, meanwhile, grease can be contained, effective sliding of the friction ring 6 is ensured, abrasion is reduced, and stable performance of the tensioner is ensured. The cross section of the spring wire of the damping spring 5 can be circular or rectangular, in this embodiment, the damping spring 5 has a rectangular cross section, and the contact area with the friction ring 6 is increased, so that the tensioning acting force on the friction ring 6 is more stable, in addition, the outer wall of the friction ring 6 is provided with a taper, and the friction ring 6 is matched with the tapered inner wall of the base 1, so that the friction force between the friction ring 6 and the inner wall of the base 1 is more stable. When the tensioning arm 7 rotates to enable the belt pulley 9 to be attached to an engine belt, when the tensioning arm 7 drives the damping spring 5 to twist so that the outer diameter is enlarged, the friction ring 6 is propped against the inner wall of the base 1 to compensate abrasion of the friction ring 6 after long-term use in real time, meanwhile, the outer wall of the friction ring 6 and the inner wall of the base 1 slide relatively to generate friction damping to absorb vibration from the engine belt, and the spiral spring 3 provides force for tensioning the engine belt to compress the belt.
When the automobile engine accelerates, the belt stretches instantly, the tensioning arm 7 rotates to press the belt of the engine, the outer diameter of the damping spring 5 is driven by the tensioning arm 7 to become smaller, the damping spring 5 is separated from the friction ring 6 instantly, the friction ring 6 loses positive pressure on the inner wall of the base 1, the friction force is zero, the tensioning arm 7 rapidly presses the belt under the action of the spiral spring 3, and the damping becomes extremely small, so that the shaking of the belt is effectively prevented. When the automobile engine is decelerated, the instantaneous rebound of the engine belt is shortened, the tensioning arm 7 is pushed to rotate reversely by the reaction force of the engine belt, the outer diameter of the damping spring 5 is increased, the friction ring 6 is instantaneously opened, positive pressure is generated on the inner wall of the base 1 by the friction ring 6, high friction damping is generated on the inner wall of the friction ring 6 and the inner wall of the base 1, the tensioning arm 7 is prevented from shaking violently by the reaction force of the belt, and the normal operation of the automobile engine belt train is ensured. After the friction ring 6 works and runs for a long time, abrasion can be generated due to the existence of friction force, when the tensioner assembly is assembled, the damping spring 5 adopts elastic pre-tensioning friction ring 6, real-time compensation can be provided when the friction ring 6 is abraded, and the damping performance of the tensioner is ensured to be stable.
Claims (7)
1. A belt tensioner with unidirectional high damping auto-compensation comprising:
a base which is a cup-shaped member with an opening;
the pin shaft is coaxially arranged in the base, and the lower end of the pin shaft is rotatably arranged at the bottom of the base;
one end part of the tensioning arm is covered at the opening of the base and is fixedly connected with the upper end of the pin shaft, and the other end part of the tensioning arm is provided with a rotatable belt pulley which is attached to an engine belt;
the spiral spring is a spiral torsion spring and is coaxially arranged in the base with the pin shaft, one end of the spiral spring is connected with the base, the other end of the spiral spring is connected with the tensioning arm, and the spiral spring drives the tensioning arm to rotate around the pin shaft so that a belt pulley on the tensioning arm is attached to an engine belt;
the damping spring and the friction ring are coaxially sleeved outside the spiral spring, the upper end of the damping spring is clamped in a clamping groove on the tensioning arm, and the outer wall of the friction ring is in sliding contact with the inner wall of the base;
when the tensioning arm rotates to enable the belt pulley to be attached to the engine belt, when the damping spring is twisted to enable the outer diameter to be large, the friction ring is unfolded to be attached to the inner wall of the base to compensate abrasion of the friction ring, and meanwhile the outer wall of the friction ring and the inner wall of the base slide relatively to generate friction damping to absorb vibration from the engine belt.
2. The belt tensioner with unidirectional high damping auto-compensation of claim 1, wherein: the damping spring has a rectangular cross section.
3. The belt tensioner with unidirectional high damping auto-compensation of claim 1, wherein: the outer wall of the friction ring is provided with a taper.
4. The belt tensioner with unidirectional high damping auto-compensation of claim 1, wherein: the spiral spring and the damping spring are right spiral springs.
5. The belt tensioner with unidirectional high damping auto-compensation of claim 1, wherein: the spiral spring is a spiral spring with two ends without bent legs, an upper stop block is arranged on the tensioning arm, a lower stop block is arranged at the bottom of the base, one end of the spiral spring abuts against the upper stop block, and the other end of the spiral spring abuts against the lower stop block.
6. The belt tensioner with unidirectional high damping auto-compensation of claim 1, wherein: a plurality of axial grooves are symmetrically arranged on the outer wall of the friction ring.
7. The belt tensioner with unidirectional high damping auto-compensation of claim 1, wherein: and a labyrinth seal is arranged at the assembling surface of the base and the tensioning arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710860013.XA CN107387693B (en) | 2017-09-21 | 2017-09-21 | Belt tensioner with unidirectional high damping automatic compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710860013.XA CN107387693B (en) | 2017-09-21 | 2017-09-21 | Belt tensioner with unidirectional high damping automatic compensation |
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| Publication Number | Publication Date |
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| CN107387693A CN107387693A (en) | 2017-11-24 |
| CN107387693B true CN107387693B (en) | 2023-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710860013.XA Active CN107387693B (en) | 2017-09-21 | 2017-09-21 | Belt tensioner with unidirectional high damping automatic compensation |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108458069A (en) * | 2018-03-31 | 2018-08-28 | 华南理工大学 | A kind of big damping automatic tensioner of variation rigidity |
| CN108443439B (en) * | 2018-05-16 | 2023-07-04 | 无锡永凯达齿轮有限公司 | Asymmetric damping-adjustable automatic tensioner |
| CN110553018A (en) * | 2018-06-01 | 2019-12-10 | 宁波丰茂远东橡胶有限公司 | drive belt tensioning device and method for operating the same |
| CN108930767B (en) * | 2018-09-30 | 2024-03-15 | 安徽康明斯动力有限公司 | Pneumatic tensioning wheel device |
| CN109611523B (en) * | 2019-02-20 | 2023-08-22 | 无锡永凯达齿轮有限公司 | High damping timing belt tensioner |
| CN110185756B (en) * | 2019-05-31 | 2021-03-30 | 安徽江淮汽车集团股份有限公司 | Engine transmission system tensioner and engine |
| CN110671477A (en) * | 2019-11-29 | 2020-01-10 | 无锡永凯达齿轮有限公司 | Damping enhanced automatic belt tensioner |
| CN111691859A (en) * | 2020-07-22 | 2020-09-22 | 山东创新石油技术有限公司 | Electric control reversing pumping unit without speed reducer |
| CN112623103B (en) * | 2020-12-17 | 2022-11-08 | 兰溪智行云运动科技有限公司 | Friction-free constant damping chain shifter for bicycle |
| CN113819174B (en) * | 2021-09-22 | 2023-02-10 | 安徽恒均粉末冶金科技股份有限公司 | Damping block for belt tensioner spring based on powder metallurgy technology and preparation method |
| CN114151520B (en) * | 2021-10-11 | 2024-03-08 | 贵州吉利发动机有限公司 | Tensioner, engine and vehicle |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3152895B2 (en) * | 1997-11-13 | 2001-04-03 | ユニッタ株式会社 | Auto tensioner |
| US6231465B1 (en) * | 1999-08-13 | 2001-05-15 | Dayco Products, Inc. | Belt tensioner assembly with unidirectional damping |
| WO2002029283A2 (en) * | 2000-10-03 | 2002-04-11 | The Gates Corporation | Belt tensioner |
| CN201731028U (en) * | 2010-06-04 | 2011-02-02 | 武汉集信传动技术有限公司 | Automatic tightener of engine belt |
| DE102012210579A1 (en) * | 2012-06-22 | 2013-12-24 | Schaeffler Technologies AG & Co. KG | Clamping apparatus e.g. belt tensioner for traction drive of combustion engine, has spring producing traction unit bias, where frictional contact force opens freewheel while frictional contact partners are moved without relative movement |
| CN203115028U (en) * | 2013-04-01 | 2013-08-07 | 无锡永凯达齿轮有限公司 | Automatic tensioning device |
| CN103174807B (en) * | 2013-04-01 | 2015-09-16 | 无锡永凯达齿轮有限公司 | Automatic tensioner |
| CN204921875U (en) * | 2015-06-08 | 2015-12-30 | 重庆大学 | Automatic tensioning ware of automobile engine belt |
| CN207364203U (en) * | 2017-09-21 | 2018-05-15 | 无锡永凯达齿轮有限公司 | The belt stress compensated automatically with unidirectional high-damping |
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2017
- 2017-09-21 CN CN201710860013.XA patent/CN107387693B/en active Active
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| CN107387693A (en) | 2017-11-24 |
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