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Automatic belt tightener with changeable rigidity

A tensioning device and variable stiffness technology, applied in the direction of transmission, belt/chain/gear, mechanical equipment, etc., can solve the problems of abnormal sound of belt system, belt span vibration, uncommon elastic stop technology, etc., to achieve a simple structure. Effect

Inactive Publication Date: 2007-05-09
SHANGHAI ZHENHUA BEARING WORKS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These characteristics of the tensioner are unfavorable for sudden changes in the engine and load conditions, which often cause severe belt span vibration, rigid impact between limit elements, abnormal noise of the belt system, etc.
Existing elastic stop technologies are uncommon and cannot fully achieve soft stops
For example, in CA97 / 00578 (CN1232530A), the end spring wire of the torsion spring is used as an "elastic" stopper, which can ease the impact force, but still cannot avoid the sudden change of the tensioning moment

Method used

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  • Automatic belt tightener with changeable rigidity
  • Automatic belt tightener with changeable rigidity
  • Automatic belt tightener with changeable rigidity

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Embodiment Construction

[0030] A preferred embodiment of the present invention is described in detail as follows in conjunction with accompanying drawing:

[0031] Referring to Fig. 1, this variable stiffness automatic belt tensioner includes a pulley 6, which is mounted on an eccentric wheel 7 through a rolling bearing 10. The inner ring of the bearing 10 is fixed on the outer circle 7c of the eccentric wheel. The eccentric wheel 7 is sleeved on a mandrel 2 through a shaft sleeve 3 . The shaft sleeve 3 and the eccentric wheel 7 adopt an interference fit, while the mandrel 2 adopts a clearance fit. The bushing 3 is made of friction material. The friction material can be made of nylon with good self-lubrication and wear resistance, and the shaft sleeve can also be made of plastic-bronze-steel multilayer composite material. The sleeve material is not limited to the above materials. One end 2a of the mandrel 2 is fixed on the bottom plate 1, and the other end 2b is equipped with a disc 9. The disc ...

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Abstract

A belt automatic tensioning device by rigidity-variable consists of eccentric displacement mechanism formed by pulley, roll bearing, eccentric wheel and debber; eccentric wheel rigidity-variable twisting mechanism formed by base plate, eccentric wheel, spring jacket base and cylindrical screw spring; damping formed by frictional damper between eccentric wheel and debber as well as frictional damper at end surface of eccentric wheel.

Description

technical field [0001] The invention relates to an automatic belt tensioning device, in particular to a variable stiffness automatic belt tensioning device suitable for belt tension control and vibration suppression of the engine front attachment belt drive and timing belt drive. Background technique [0002] Belt drives are widely used in modern automobile engines to drive engine accessories such as generators, air-conditioning compressors, fans, etc. Even the camshafts that need to maintain a strict phase relationship with the crankshaft also use belt drives. To maintain proper belt tension, avoid belt slippage, and compensate for belt elongation after wear and age, automatic tensioners are essential components. Common automatic tensioner is swing type, and also has linear movement type, as US01 / 24096 (CN01813572.2) etc. The structure of the swing type automatic tensioner is relatively simple, so it is more common. Its structure and working principle are roughly as follow...

Claims

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Application Information

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IPC IPC(8): F16H7/08
CPCF16H2007/081
Inventor 刘红宇邵玉佳李宝福王文
Owner SHANGHAI ZHENHUA BEARING WORKS
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