Silent chain

a technology of silent chain and resonance, applied in the direction of driving chains, belts/chains/gearrings, chain elements, etc., can solve the problems of reducing the power transmission efficiency of the chain, noise occurrence, etc., and achieve the reduction of the chordal oscillation, and the reduction of the resonan

Inactive Publication Date: 2007-03-29
BORGWARNER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] According to the first aspect of the present invention, since at least two types of guide plates of different weight are disposed at a random pattern in the longitudinal direction, the weight of the chain span between the drive and driven sprockets varies successively during operation and eigenfrequency of the chain span thus varies successively. Thereby, occurrence of the resonance can be restrained and chordal oscillation of the chain span can be decreased. In this case, since only the weight of the guide plates needs to be changed a decrease in the chordal oscillation can be achieved without causing frictional loss. The weight of the guide plates may be made different by altering at least one of the geometric configurations, thicknesses, and materials. Also, the geometric configurations of the guide plates may be made different by altering the shapes of the backside surfaces.
[0014] According to the second aspect of the present invention, since at least two types of link plates of different weight are disposed at a random pattern in the longitudinal direction, the weight of the chain span between the drive and driven sprockets varies successively during operation and eigenfrequency of the chain span thus varies successively. Thereby, occurrence of the resonance can be restrained and chordal oscillation of the chain span can be decreased. In this case, since only the weight of the link plates needs to be changed a decrease in the chordal oscillation can be achieved without causing frictional loss.
[0016] According to the third aspect of the present invention, since at least two types of connecting pins of different weight are disposed at a random pattern in the longitudinal direction, the weight of the chain span between the drive and driven sprockets varies successively during operation and eigenfrequency of the chain span thus varies successively. Thereby, occurrence of the resonance can be restrained and chordal oscillation of the chain span can be decreased. In this case, since only the weight of the connecting pins needs to be changed a decrease in the chordal oscillation can be achieved without causing frictional loss.
[0019] According to the fourth aspect of the present invention, since the washers are disposed at a random pattern in the longitudinal direction, the weight of the chain span between the drive and driven sprockets varies successively during operation and eigenfrequency of the chain span thus varies successively. Thereby, occurrence of the resonance can be restrained and chordal oscillation of the chain span can be decreased. In this case, since only the arrangement of the washers needs to be changed a decrease in the chordal oscillation can be achieved without causing frictional loss.

Problems solved by technology

During operation of the silent chain, chordal oscillation that generates in the chain span between the driving and driven sprockets is one of the causes of noise occurrences.
However, in the prior art silent chain, the biasing forces by the leaf springs act between the adjacent link plates at all times during operation.
Therefore, there is a disadvantage that it has a considerable friction loss during operation which causes a decrease in power transmission efficiency of the chain.

Method used

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Examples

Experimental program
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first embodiment

[0028] FIGS. 1 to 4 illustrate the present invention. As shown in FIGS. 1 and 2, a silent chain 1 is composed of a plurality of link plates 2 interleaved in the lateral and longitudinal directions and pivotably connected by connecting pins 3 and a plurality of first and second guide plates 4, 4′ disposed on the outermost sides of the silent chain 1.

[0029] The silent chain 1 is also composed of a plurality of guide rows 5 that are formed of the first guide plates 4 and the link plates 2 disposed at the same longitudinal position as the first guide plate 4, a plurality of guide rows 5′ that are formed of the second guide plates 4′ and the link plates 2 disposed at the same longitudinal position as the second guide plate 4′, and a plurality of link rows 6 that are formed of only the link plates 2 and that are disposed between the adjacent guide rows 5, 5′. The guide rows 5, 5′ and the link rows 6 are arranged alternately in the longitudinal direction. Also, the first and second guide p...

second embodiment

[0035]FIGS. 5 and 6 illustrate the present invention. In these drawings, like reference numbers indicate identical or functionally similar elements.

[0036] In the above-mentioned first embodiment, the weight of the guide plates varies at a random pattern in the longitudinal direction by differentiating the shapes of the backside surfaces of the guide plates, but in the second embodiment, the weight of the link rows or guide rows varies at a random pattern in the longitudinal direction by differentiating the shapes of the backside surfaces of the link plates.

[0037] The backside surface 24 of the first link plate 2 is concave in shape as shown in FIG. 5, whereas the backside surface 24′ of the second link plate 2′ is convex in shape as shown in FIG. 6.

[0038] Therefore, in this case, the link plate 24′ is heavier than the link plate 24 and the link rows or guide rows formed of these link plates 24, 24′ are arranged at a random or irregular pattern in the longitudinal direction.

[0039]...

fourth embodiment

[0043]FIGS. 7 and 8 illustrate the present invention. In these drawings, like reference numbers indicate identical or functionally similar elements.

[0044] In the fourth embodiment, washers 30 are fixedly attached to the ends of the connecting pins 3. The locations of the washers 30 are arranged at a random pattern in the longitudinal direction.

[0045] In this case as well, the weight of the chain span between the drive and driven sprockets varies successively during operation and eigenfrequency of the chain span thus varies successively. Thereby, occurrence of the resonance can be restrained and chordal oscillation of the chain span can be decreased.

[0046] In the above-mentioned first to third embodiments, two types of guide plates, link plates, or connecting pins of different weight were used, but the present invention can be applied to the case in which three type s or more of guide plates, link plates, or connecting pins of different weight are used.

[0047] In the above-mentione...

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PUM

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Abstract

String vibration is reduced without causing friction loss. A silent chain is comprised of a multiple number of link plates, each of which has a pair of tooth portions and pin holes and which are laminated laterally and longitudinally and guide plates which are arranged at outermost positions of the link plates. The link plates and the guide plates are connected by connecting pins. In this construction, some of the guide plates are made heavier than that of other guide plates and are irregularly mixed in a longitudinal direction of the chain. Thus, the natural frequency can be changed in an arbitrary chain span and string vibration may be reduced without causing friction loss.

Description

REFERENCE TO RELATED APPLICATIONS [0001] This application claims an invention which was disclosed in Japanese application No. 2005-281751, filed Sep. 28, 2005, entitled “SILENT CHAIN”. The benefit under 35 USC §119(a) of the Japanese application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a silent chain in which multiple link plates each having a pair of teeth and pin apertures are interleaved in the longitudinal and lateral directions and interconnected to each other by the connecting pins, and more particularly, to an improvement of the structure of the silent chain to decrease the chordal oscillation. [0004] 2. Description of Related Art [0005] Silent chains are used as timing chains for automobiles, motorcycles, and the like. A silent chain is typically comprised of multiple link plates each having a pair of teeth and pin apert...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16G13/04
CPCF16G13/04
Inventor SAKAMOTO, NAOJI
Owner BORGWARNER INC
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