CN103968019B - A kind of electromotor damps low decay stretcher with big - Google Patents
A kind of electromotor damps low decay stretcher with big Download PDFInfo
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- CN103968019B CN103968019B CN201410112505.7A CN201410112505A CN103968019B CN 103968019 B CN103968019 B CN 103968019B CN 201410112505 A CN201410112505 A CN 201410112505A CN 103968019 B CN103968019 B CN 103968019B
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- damping
- pedestal
- spring
- face
- damping block
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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
- F16H7/0829—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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- 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
- F16H2007/081—Torsion 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)
- Springs (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The present invention relates to electromotor stretcher, and damp low decay stretcher more specifically to a kind of electromotor with big.A kind of electromotor damps low decay stretcher with big, and including pedestal, tensioner arm and the spring being arranged in pedestal and damping block, described pedestal has a pedestal inner cylinder face；Described damping block has a rubbing surface, and this rubbing surface is fitted with described pedestal inner cylinder face, forms frictional damping when relative motion；Described tensioner arm has a projection, and when described tensioner arm rotates around described pedestal, described projection promotes the motion of described damping block；Described types of springs is cylindroid helical-coil torsion spring, two end faces that is first end face of described spring and the second end face abut against with described damping block and pedestal respectively, described spring is radial dilatation when loading, and its external diameter promotes described damping block to be adjacent to described pedestal inner cylinder face.
Description
Technical field
The present invention relates to electromotor stretcher, and damp low decay stretcher more specifically to a kind of electromotor with big.
Background technology
Car engine machine vibration and noise problem are required more and more stricter by people, self-action belt stress with damping mechanism can solve vibration and the noise problem in motor head adnexa face well, but damping mechanism technology mostly exists the problem that damping force is not enough or damping vibration attenuation is violent at present.
nullSuch as Fig. 6、Fig. 7 show a kind of Typical Representative of prior art，After assembling，Disk spring 25 is axially compressed，And produce axial force，Damping piece 26 is promoted to be adjacent at both faying faces 28 with cover plate 27，The material of damping piece 26 is wear resistant nylon，When stretcher works，Damping piece 26 relatively rotates with cover plate 27，Therefore frictional damping is produced at faying face 28，This technology，Disk spring 25 is needed to have bigger stiffness，The i.e. the most non-little decrement of disk spring produces bigger axial force，Normally used stiffness is on close level 2000N/mm，This results in all correlated parts accumulation manufacturing tolerance in the axial direction，The biggest on axial force impact，The damping force obtained is unstable，Additionally，During product uses，Owing to fretting wear can cause the change of part axial size，The decrement of disk spring 25 can reduce，And then affect damping force，Damping vibration attenuation can reach more than 50%.
Such as Fig. 8, Fig. 9 show the another kind of Typical Representative of prior art, after assembling, spring 30 is loaded, the spring-loaded manner of this technology is to pull (promotion being different from this patent) both ends of the spring first to link up with 32 and second to link up with 33, after spring is loaded, its internal diameter reduces, damping sleeve 29 is circumferentially held tightly by spring inside diameter, and it is close to the face of cylinder 34 of tensioner arm 31, when stretcher works, damping sleeve 29 relatively rotates with the face of cylinder 34 of tensioner arm 31, therefore frictional damping is produced, this technology, because the normal pressure source only one of which of frictional damping, therefore frictional damping moment of torsion and spring torque ratio are difficult to more than 0.6, the system requirements of some needs damping greatly can not be met.
Summary of the invention
The present invention provides a kind of electromotor to damp low decay stretcher with big.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of electromotor damps low decay stretcher with big, and including pedestal, tensioner arm and the spring being arranged in pedestal and damping block, described pedestal has a pedestal inner cylinder face；Described damping block has a rubbing surface, and this rubbing surface is fitted with described pedestal inner cylinder face, forms frictional damping when relative motion；Described tensioner arm has a projection, and when described tensioner arm rotates around described pedestal, described projection promotes the motion of described damping block；Described types of springs is cylindroid helical-coil torsion spring, two end faces that is first end face of described spring and the second end face abut against with described damping block and pedestal respectively, described spring is radial dilatation when loading, and its external diameter promotes described damping block to be adjacent to described pedestal inner cylinder face.
Pedestal inner cylinder face produces frictional damping with damping block relative motion, tensioner arm moves around pedestal rotation forces damping block, and damping block drives spring to reverse, stretcher required torque is provided, and cooperatively form with joint efforts with tensioner arm, first normal pressure of frictional damping is provided, simultaneously, spring is external diameter expansion when reversing, promote damping block to be adjacent to pedestal inner cylinder face, form the second normal pressure of frictional damping, owing to the first normal pressure and the second normal pressure act on simultaneously, so forming big frictional damping, damping torque and spring torque ratio are up to more than 0.85.Owing to the first normal pressure and the second normal pressure derive from the moment of torsion that spring provides, (and size with spring torque linear correlation), during product uses, change due to the accessory size that fretting wear causes, the angle impact reversed when being loaded spring is extremely slight, and therefore spring torque change is the least, and damping vibration attenuation principal element is the decay of spring self moment of torsion, in whole life cycle, its value is less than 15%.
As preferably, described damping block has two end faces that is the 3rd end face and the 4th end face, respectively with the projection laminating on the first end face of described spring and tensioner arm, is formed with joint efforts when described spring loads with described projection, it is provided that frictional damping the first normal pressure.
As preferably, described damping block has an inner cylinder face, compresses with described spring outer diameter when described spring loads also radial dilatation, it is provided that frictional damping the second normal pressure.
As preferably, damping block is combined by damping sleeve and skeleton, and skeleton is rigid structure, and damping sleeve is made up of elastomeric material, and damping sleeve and skeleton joint portion between the two is provided with the engaging tooth of male-female engagement.
The electromotor of the present invention damps the damping of low decay stretcher relatively greatly with big, and slight in the decay of whole life cycle internal damping.
Accompanying drawing explanation
Fig. 1 be inventive engine with the big tensioner position damping low one preferred embodiments of decay stretcher and belt around to schematic diagram；
Fig. 2 is that electromotor shown in Fig. 1 damps low decay stretcher A-A sectional view with big；
Fig. 3 is that electromotor shown in Fig. 2 damps low decay stretcher B-B sectional view with big, it is shown that the stress relation of each part；
Fig. 4 is the structural representation of damping block of the present invention；
Fig. 5 is the structural representation of tensioner arm of the present invention；
Fig. 6 is the structural representation of existing a kind of stretcher；
Fig. 7 is the cross-sectional schematic of stretcher shown in Fig. 6；
Fig. 8 is the structural representation of existing a kind of stretcher；
Fig. 9 is the cross-sectional schematic of stretcher shown in Fig. 8；
In Fig. 1-5, each parts labelling is as follows: 1. the first band section, 2. the second band section, 3. pedestal, 4. spring, 5. damping block, 6. tensioner arm, 7. lining, 8. mandrel, 9. belt wheel, 10. dust cap, 11. bearings, 12. screws, 13. pedestal inner cylinder faces, 14. rubbing surfaces, 15. the 3rd end faces, 16. first end faces, 17. second end faces, 18. the 4th end faces, 19. projections, 20. damping sleeves, 21. skeletons, 22. engaging tooths, 23. inner cylinder faces, 24. tensioner arm inner cylinder faces.
Detailed description of the invention
Below by specific embodiment, and combine accompanying drawing, technical scheme is described in further detail.Should be appreciated that the enforcement of the present invention is not limited to the following examples, any pro forma accommodation and/or the change of being made the present invention fall within scope.
A kind of electromotor as depicted in figs. 1 and 2 damps low decay stretcher with big, including pedestal 3, mandrel 8, tensioner arm 6 and the spring 4 being arranged in pedestal and damping block 5.Pedestal has a pedestal inner cylinder face 13；Damping block has a rubbing surface 14, and this rubbing surface is fitted with pedestal inner cylinder face, forms frictional damping when relative motion.Tensioner arm has a projection 19, and when tensioner arm rotates around pedestal, projection promotes damping block motion.Types of springs is cylindroid helical-coil torsion spring, and two end faces that is first end face 16 of spring and the second end face 17 abut against with damping block and pedestal respectively, and spring is radial dilatation when loading, and its external diameter promotes damping block to be adjacent to pedestal inner cylinder face.
Pedestal 3 and mandrel 8 interference fit joint, belt wheel 9, dust cap 10, bearing 11 and screw 12 are equipped with tensioner arm 6 and can rotate centered by mandrel 8, separate with lining 7 between tensioner arm 6 and mandrel 8.
Damping block has two end faces that is the 3rd end face 15 and the 4th end face 18, respectively with the projection laminating on the first end face of spring and tensioner arm, is formed with joint efforts when spring loads with projection, it is provided that frictional damping the first normal pressure.Damping block has an inner cylinder face 23, compresses with spring outer diameter when spring loads also radial dilatation, it is provided that frictional damping the second normal pressure.
With reference to Fig. 4, damping block 5 is combined by damping sleeve 20 and skeleton 21, and skeleton 21 is rigid structure, and available cast steel, powder metallurgy or other material with some strength and easy-formation are made, and damping sleeve 20 is made up of elastomeric material, and material can use wear resistant nylon.During making, skeleton outer circumference surface is molded one layer of elastic construction and forms damping sleeve.Damping sleeve 20 and skeleton 21 joint portion between the two are provided with the engaging tooth 22 of male-female engagement, to limit relative rotary motion.Skeleton entirety semicircular in shape structure, its vertical section is L-shaped, is aforesaid inner cylinder face inside L-shaped；Damping sleeve is wrapped in the outer surface of skeleton, and damping sleeve is also referred to as L-shaped.
With reference to Fig. 1, in motor head accessory wheel system, stretcher is in operating position and reaches balance, and the first band section 1 and the second band section 2 are applied to the tension force F of stretcher and form the P that makes a concerted effort.
With reference to Fig. 3 and Fig. 5, the P that makes a concerted effort suffered by self is passed to damping block 5 in the 4th end face 18 joint place of the side of projection 19 Yu damping block by tensioner arm 6, and dampened piece of 5 counteracting force P ', P is passed to spring 4 in the first end face 16 joint place of the 3rd end face 15 with spring by damping block 5, and by spring 4 counteracting force P1, the P2 that makes a concerted effort of P and P1 is normal direction normal pressure suffered by damping block 5, and this is frictional damping the first normal pressure, and the rubbing surface 14 at pedestal inner cylinder face 13 with damping block 5 forms frictional damping.The moment of torsion W balance that power P is produced by spring, spring 4 is limited rotation by pedestal 3 at the second end face 17.
With reference to Fig. 3, spring 4 is loaded after the effect of stress P, and its external diameter expansion compresses inner cylinder face 23, produces radially-arranged pressure △ f, and the method in damping block 5 external friction face 14 is upwardly formed P3 with joint efforts, and this is frictional damping the second normal pressure.It addition, compress tensioner arm inner cylinder face 24 during spring 4 external diameter expansion, producing radially-arranged pressure △ f, the method at tensioner arm inner cylinder face 24 is upwardly formed P3 ' with joint efforts, balances with P3 with joint efforts.
District is separately in prior art, and the present invention improves the damping of stretcher, and slight in the decay of whole life cycle internal damping.Pedestal inner cylinder face produces frictional damping with damping block relative motion, tensioner arm moves around pedestal rotation forces damping block, and damping block drives spring to reverse, stretcher required torque is provided, and cooperatively form with joint efforts with tensioner arm, first normal pressure of frictional damping is provided, simultaneously, spring is external diameter expansion when reversing, promote damping block to be adjacent to pedestal inner cylinder face, form the second normal pressure of frictional damping, owing to the first normal pressure and the second normal pressure act on simultaneously, so forming big frictional damping, damping torque and spring torque ratio are up to more than 0.85.Owing to the first normal pressure and the second normal pressure derive from the moment of torsion that spring provides, (and size with spring torque linear correlation), during product uses, change due to the accessory size that fretting wear causes, the angle impact reversed when being loaded spring is extremely slight, and therefore spring torque change is the least, and damping vibration attenuation principal element is the decay of spring self moment of torsion, in whole life cycle, its value is less than 15%.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilized done by description of the invention and accompanying drawing content or equivalence flow process exchange; or directly or indirectly it is used in other relevant technical field, the most in like manner it is included in the scope of patent protection of the present invention.
Claims (2)
1. electromotor damps a low decay stretcher with big, including pedestal, tensioner arm and the spring being arranged in pedestal and damping block, it is characterised in that:
Described pedestal has a pedestal inner cylinder face；
Described damping block has a rubbing surface, and this rubbing surface is fitted with described pedestal inner cylinder face, forms frictional damping when relative motion；
Described tensioner arm has a projection, and when described tensioner arm rotates around described pedestal, described projection promotes the motion of described damping block；
Described types of springs is cylindroid helical-coil torsion spring, two end faces that is first end face of described spring and the second end face abut against with described damping block and pedestal respectively, described spring is radial dilatation when loading, and its external diameter promotes described damping block to be adjacent to described pedestal inner cylinder face；Described damping block has two end faces that is the 3rd end face and the 4th end face, respectively with the projection laminating on the first end face of described spring and tensioner arm, is formed with joint efforts when described spring loads with described projection, it is provided that frictional damping the first normal pressure；Described damping block has an inner cylinder face, compresses with described spring outer diameter when described spring loads also radial dilatation, it is provided that frictional damping the second normal pressure.
Electromotor the most according to claim 1 damps low decay stretcher with big, it is characterized in that: damping block is combined by damping sleeve and skeleton, skeleton is rigid structure, and damping sleeve is made up of elastomeric material, and damping sleeve and skeleton joint portion between the two is provided with the engaging tooth of male-female engagement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410112505.7A CN103968019B (en) | 2014-03-25 | 2014-03-25 | A kind of electromotor damps low decay stretcher with big |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410112505.7A CN103968019B (en) | 2014-03-25 | 2014-03-25 | A kind of electromotor damps low decay stretcher with big |
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| CN103968019A CN103968019A (en) | 2014-08-06 |
| CN103968019B true CN103968019B (en) | 2017-01-04 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104179906A (en) * | 2014-08-08 | 2014-12-03 | 莱顿汽车部件（苏州）有限公司 | Spring-extending-type, high-damping and automatic tensioner |
| CN108458069A (en) * | 2018-03-31 | 2018-08-28 | 华南理工大学 | A kind of big damping automatic tensioner of variation rigidity |
| CN111306264A (en) * | 2018-12-11 | 2020-06-19 | 宁波丰茂远东橡胶有限公司 | Engine and driving belt tensioning device thereof and tensioning method of driving belt |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203770558U (en) * | 2014-03-25 | 2014-08-13 | 宁波丰茂远东橡胶有限公司 | High-damping low-attenuation tensioner for engine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0289838A (en) * | 1988-09-27 | 1990-03-29 | Mitsuboshi Belting Ltd | Autotensioner for belt |
| US5803849A (en) * | 1995-06-14 | 1998-09-08 | Unitta Company | Belt tensioner |
| JP2951321B1 (en) * | 1998-06-26 | 1999-09-20 | ユニッタ株式会社 | Auto tensioner |
| JP2002039297A (en) * | 2000-07-19 | 2002-02-06 | Unitta Co Ltd | Auto-tensioner |
| DE102006054963B4 (en) * | 2006-11-22 | 2020-11-05 | Schaeffler Technologies AG & Co. KG | Clamping device of a traction drive |
| DE102008050384A1 (en) * | 2008-10-02 | 2010-04-08 | Schaeffler Kg | Clamping and damping device for traction drives |
| WO2010037232A1 (en) * | 2008-10-02 | 2010-04-08 | Litens Automotive Partnership | Compact tensioner with sustainable damping |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203770558U (en) * | 2014-03-25 | 2014-08-13 | 宁波丰茂远东橡胶有限公司 | High-damping low-attenuation tensioner for engine |
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Address after: 315400 ce10, Far East Industrial City, Yuyao Economic Development Zone, Ningbo City, Zhejiang Province Patentee after: Zhejiang Fengmao Technology Co.,Ltd. Address before: 315400 ce10, Far East Industrial City, Yuyao Economic Development Zone, Ningbo City, Zhejiang Province Patentee before: Ningbo Fengmao Far-East Rubber Co.,Ltd. |