CN102691763B - Belt tensioner - Google Patents
Belt tensioner Download PDFInfo
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- CN102691763B CN102691763B CN201210198126.5A CN201210198126A CN102691763B CN 102691763 B CN102691763 B CN 102691763B CN 201210198126 A CN201210198126 A CN 201210198126A CN 102691763 B CN102691763 B CN 102691763B
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- axle sleeve
- pedestal
- accessory mount
- bolt
- belt
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Abstract
The invention discloses a belt tensioner arranged on an attachment bracket for tensioning a belt. The belt tensioner comprises a rack body with a first through hole, a tension wheel connected with the rack body through a bearing, a base with a second through hole, and a ladder shaft sleeve including a main section and an auxiliary section; the main section is arranged in the first through hole in a penetrating mode; the auxiliary section is arranged in the second through hole by interference fit; a ladder annular surface of the shaft sleeve is pressed on the top surface of a base; the bottom surface of the base resists against the attachment bracket; a gap is arranged between the end face of the tail end of the shaft sleeve opposite to the attachment bracket and the attachment bracket, and a gap is preserved between the end face of the shaft sleeve in the belt tensioner and an attachment mounting bracket, so the contact area of the base of the tensioner and the attachment mounting bracket is ensured, alternating shear stress in a diameter direction of a fixed bolt and the stress of the joint surface between the base and the attachment mounting bracket are dispersed, loosening caused by abnormal reduction of torque of the bolt is avoided and the probability of fatigue fracture of the bolt is also reduced at the same time.
Description
Technical field
The present invention relates to a kind of belt tightener, particularly relate to a kind of belt tightener for motor car engine accessory wheel system.
Background technique
In motor car engine accessory wheel system, the accessory wheel system driven by crank pulley is common functional structure.In train, a part of moment of torsion relying on poly Vbelt to be exported by bent axle is delivered on the equipment such as generator, power assistance pump for steering and air condition compressor, for the said equipment provides power, ensures that corresponding system normally realizes its function.In train, usually use belt tightener, when different crank torque exports, ensure that the tension force of belt is in effective coverage.Existing belt tightener mainly comprises wheel body, rolling bearing, support body, torsion spring, axle sleeve, pedestal etc.
Existing belt tightener, need to ensure that the little end surface of axle sleeve is concordant with base end face, in Idle wheel processing, namely axle sleeve press-fits in process, by Equipment Inspection, when axle sleeve microcephaly is concordant with base lower end surface, stops press-fiting.All higher to the requirement of technical face and quality monitoring like this.Be not easy the conformity ensureing that part press-fits.
Existing belt tightener is after several dynamic circulation, likely occur that pedestal moves up along the axis of axle sleeve, there is the situation that axle sleeve microcephaly protrudes base bottom surface, make to produce gap between pedestal and accessory mount, thus reduction bonded area, be unfavorable for the stress disperseing junction plane place axle sleeve and bolt to bear, the stress that the moment of flexure that belt produces the construction bolt of stretcher causes concentrates on bolt and accessory mount joint, easily causes bolt fracture.
When Idle wheel assembles, after bolt-locking, the power that axially fastens is delivered to accessory mount by axle sleeve and pedestal, the elastic force of the combination force+spring deformation of the combination force between pedestal and accessory mount=axle sleeve microcephaly and pedestal.And the pressure between accessory mount and axle sleeve microcephaly is the clamping force of bolt, larger than the combination force of base, therefore suffered by base and axle sleeve microcephaly between holding power, there is a pressure difference, in the vibration of some pulsation and after several stress cycle, may occur base moves, show the situation that axle sleeve microcephaly is protruded.Bonded area now between stretcher and accessory mount (annex mounting bracket) reduces, may occur that the stress of radial pressure between stretcher and accessory mount can not be distributed to whole junction plane effectively, easily occur that stress is concentrated, thus cause bolt fracture.
Summary of the invention
Not enough for prior art, the technical problem to be solved in the present invention is to provide a kind of effectively dispersive stress and moment of flexure thus prevents connecting bolt from rupturing, and extends the belt tightener in its working life.
In order to overcome prior art deficiency, the technical solution used in the present invention is: a kind of belt tightener, be installed on accessory mount and tensioning is carried out to belt, described belt tightener comprises the support body with the first via hole, by the Idle wheel that bearing is connected with described support body, there is the pedestal of the second via hole, there is the ladder-type axle sleeve of principal piece and attached section, described principal piece is arranged in described first via hole, be arranged in described second via hole to described attached section of interference fit, the ladder anchor ring of described axle sleeve presses on the end face of described pedestal, the bottom surface of described pedestal abuts with described accessory mount, described axle sleeve has gap towards between the distal end faces and described accessory mount of described accessory mount.
As the improvement of the technological scheme of belt tightener of the present invention, the length of described attached section is less than the distance between the end face of described pedestal and bottom surface.
As the improvement of the technological scheme of belt tightener of the present invention, described accessory mount is provided with counterbore, the terminal part of attached section of described axle sleeve stretch into described counterbore and with described counterbore transition fit, the distal end faces of described attached section and the bottom surface of described counterbore have gap.
As the improvement of the technological scheme of belt tightener of the present invention, described support body is provided with annular groove, is provided with spring in described annular groove, and described spring all abuts with described support body and described pedestal.
The invention has the beneficial effects as follows: the end face of shaft bush in belt tightener and leave gap between annex mounting bracket, guarantee the area of contact of stretcher pedestal and motor opponent part-annex mounting bracket, the dispersion fixing bolt diametric alternation shearing stress of bearing and the stress at junction plane place between pedestal and annex mounting bracket, prevent abnormal decline of bolt torque and loosen, reducing bolt simultaneously and tired probability occurs.
Accompanying drawing explanation
Fig. 1 is the cross section structure schematic diagram of a kind of embodiment of belt tightener of the present invention.
Fig. 2 is the cross section structure schematic diagram of the another kind of embodiment of belt tightener of the present invention.
Embodiment
Below embodiments of the present invention are specifically described.
Shown in figure 1, Fig. 2, a kind of belt tightener of the present invention, can be installed on accessory mount 50 by bolt 28 and be carried out side direction by the rotary pressure of Idle wheel wherein and torsion spring to belt and exert pressure thus make belt tension.Accessory mount 50 i.e. annex mounting bracket, for installing the annexes such as belt tightener.Described belt tightener comprises the support body 10 with the first via hole 11, by the Idle wheel 16 that bearing 18 is connected with described support body 10, there is the pedestal 30 of the second via hole, there is the ladder-type axle sleeve 20 of principal piece 21 and attached section 22, described principal piece 21 is arranged in described first via hole 11, be arranged in described second via hole to described attached section of 22 interference fit, the ladder anchor ring 25 of described axle sleeve 20 presses on the end face 35 of described pedestal 30, the bottom surface 36 of described pedestal 30 abuts with described accessory mount 50, described axle sleeve 20 has gap towards between the distal end faces 26 and described accessory mount 50 of described accessory mount 50.Support body 10 is main body racks of stretcher, and it offers the first via hole 11 for installing axle sleeve and bolt 28 thus whole belt tightener being fixedly mounted on the corresponding attachment face place of accessory mount 50.In addition, support body 10 is also provided with corresponding position and installs bearing 18 and Idle wheel.Leave gap between the circumferential surface of support body 10 and axle sleeve 20, make support body 10 and axle sleeve 20 form rotatable movable connection structure.
Gap is left between the end face of the axle sleeve 20 in belt tightener and annex mounting bracket 50, guarantee the pedestal 30 of stretcher and the area of contact of motor opponent part-annex mounting bracket 50, thus the dispersion fixing bolt 28 diametric alternation shearing stress of bearing and the stress at junction plane place between pedestal 30 and annex mounting bracket 50, prevent abnormal decline of bolt torque and loosen, reducing bolt simultaneously and tired probability occurs.At junction plane place, moment of flexure also can by axle sleeve 20 and bolt 28 shared, and relatively little moment of flexure can prevent Bolt Torque decay pattern of anomaly, thus prevents clamping bolt from loosening, and the problem such as the abnormal sound thereupon produced.
Interference fit between axle sleeve 20 and pedestal 30 is also pushed down pedestal 30 with step surface front thus makes bolt indirectly lock pedestal 30, to reduce the technological requirement to processing junction plane.Now, merely just the impacting force to pedestal 30 can be controlled, and then the installation controlling whole belt tightener is fastening by controlling bolt pretightening.
More preferably, the length of described attached section 22 is less than the distance between the end face 35 of described pedestal 30 and bottom surface 36.Namely the length of attached section 22 is less than the second mistake hole depth, makes the end face of axle sleeve 20 and accessory mount 50 support leave gap.When part is produced, the matching relationship of the axle sleeve after optimization, pedestal, accessory mount reduces the technological requirement that axle sleeve press-fits, and reduces the complexity of belt tightener.
More preferably, described accessory mount 50 is provided with counterbore 52, the terminal part of attached section 22 of described axle sleeve 20 stretch into described counterbore 52 and with described counterbore 52 transition fit, the distal end faces 26 of described attached section 22 has gap with the bottom surface of described counterbore 52.Axle sleeve 20 microcephaly embeds in the default mounting hole of accessory mount, makes axle sleeve 20 also can share moment of flexure, improves the resistivity of whole Idle wheel to moment of flexure.
Particularly, on existing belt tightener basis, lengthen axle sleeve 20 microcephaly axial length, and the counterbore 52 coordinated with it is increased at accessory mount 50, the concave station ensureing the little end surface of axle sleeve 20 and accessory mount with tolerance of size there is suitable gap, makes the junction plane of Idle wheel and accessory mount be still the mating face between pedestal and accessory mount.When Idle wheel is subject to the next vibration of train transmission and moment of flexure, effectively can be distributed to pedestal 30 with on the junction plane of accessory mount 50, and be not only born by bolt.Such structure can improve Idle wheel opposing vibration and Engine torque changes the ability of the impact brought, and improves the reliability of whole train.It is Spielpassung between axle sleeve microcephaly circumferential surface and accessory mount, be convenient to install, and part side direction moment of flexure is born when Idle wheel works, reduce the moment of flexure that bolt bears, add the join strength between belt tightener and accessory mount 50, improve the ability of the resistance vibration of belt tightener, reduce the probability of bolt torque decay pattern of anomaly, prevent Idle wheel from loosening, the stability of a system of motor is promoted, the risk of clamping bolt fatigue reduces.
More preferably, described support body 10 is provided with annular groove 13, is provided with spring 15 in described annular groove 13, and described spring 15 all abuts with described support body 10 and described pedestal 30.Described spring 15 is torsion spring, and this torsion spring drives the rotatable support body 10 being socketed on axle sleeve 20 to produce and swings, and Idle wheel 16 is flapped toward belt compression belt thereupon and makes its tensioning.
Above disclosedly be only the preferred embodiments of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the present patent application the scope of the claims is done, still belong to the scope that the present invention is contained.
Claims (3)
1. a belt tightener, be installed on accessory mount and tensioning is carried out to belt, it is characterized in that: described belt tightener comprises the support body with the first via hole, by the Idle wheel that bearing is connected with described support body, there is the pedestal of the second via hole, there is the ladder-type axle sleeve of principal piece and attached section, described principal piece is arranged in described first via hole, be arranged in described second via hole to described attached section of interference fit, the ladder anchor ring of described axle sleeve presses on the end face of described pedestal, the bottom surface of described pedestal abuts with described accessory mount, described axle sleeve has gap towards between the distal end faces and described accessory mount of described accessory mount, described accessory mount is provided with counterbore, the terminal part of attached section of described axle sleeve stretch into described counterbore and with described counterbore transition fit, the distal end faces of described attached section and the bottom surface of described counterbore have gap, gap is left between support body and the circumferential surface of axle sleeve.
2. belt tightener according to claim 1, is characterized in that: the length of described attached section is greater than the distance between the end face of described pedestal and bottom surface.
3. belt tightener according to claim 1, is characterized in that: described support body is provided with annular groove, is provided with spring in described annular groove, and described spring all abuts with described support body and described pedestal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210198126.5A CN102691763B (en) | 2012-06-15 | 2012-06-15 | Belt tensioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210198126.5A CN102691763B (en) | 2012-06-15 | 2012-06-15 | Belt tensioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102691763A CN102691763A (en) | 2012-09-26 |
| CN102691763B true CN102691763B (en) | 2015-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210198126.5A Active CN102691763B (en) | 2012-06-15 | 2012-06-15 | Belt tensioner |
Country Status (1)
| Country | Link |
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| CN (1) | CN102691763B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103016658B (en) * | 2012-12-18 | 2016-08-10 | 潍柴动力股份有限公司 | A kind of Diesel engine |
| CN107366723A (en) * | 2017-08-10 | 2017-11-21 | 无锡沄沨科技有限公司 | A kind of lithium battery isolation membrane flush coater stretcher |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1862702A2 (en) * | 2006-05-30 | 2007-12-05 | Nissan Motor Co., Ltd. | Tensioner |
| CN201116590Y (en) * | 2007-07-13 | 2008-09-17 | 上海振华轴承总厂 | Automatic belt tension pulley device with multiple damping |
| CN201795007U (en) * | 2010-09-11 | 2011-04-13 | 成都嘉陵华西光学精密机械有限公司 | Tension wheel assembly |
| CN202746515U (en) * | 2012-06-15 | 2013-02-20 | 广州汽车集团乘用车有限公司 | Belt tightener |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080119310A1 (en) * | 2006-11-16 | 2008-05-22 | Holcombe C Scott | Rotary tensioner |
| US20100261564A1 (en) * | 2009-04-13 | 2010-10-14 | Hughes Thomas E | Rotary tensioner |
-
2012
- 2012-06-15 CN CN201210198126.5A patent/CN102691763B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1862702A2 (en) * | 2006-05-30 | 2007-12-05 | Nissan Motor Co., Ltd. | Tensioner |
| CN201116590Y (en) * | 2007-07-13 | 2008-09-17 | 上海振华轴承总厂 | Automatic belt tension pulley device with multiple damping |
| CN201795007U (en) * | 2010-09-11 | 2011-04-13 | 成都嘉陵华西光学精密机械有限公司 | Tension wheel assembly |
| CN202746515U (en) * | 2012-06-15 | 2013-02-20 | 广州汽车集团乘用车有限公司 | Belt tightener |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102691763A (en) | 2012-09-26 |
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Address after: 511434, No. 633, Jinshan Avenue East Road, Guangzhou, Guangdong, Panyu District Patentee after: Guangzhou Automobile Passenger Car Co., Ltd. Address before: 510030, 633, Jinshan Avenue East, Guangzhou, Guangdong, Panyu District Patentee before: Guangzhou GAC Group Motor Co., Ltd. |
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