Silent chain transmission device

Abstract

An object of the present invention is to provide a silent chain transmission device which stabilizes chain behavior during chain travel to suppress an occurrence of tooth skipping and reduces a string vibration sound and a meshing noise with a simple configuration. In a silent chain transmission device 100 made up of a silent chain 110 and a sprocket 180, a pitch between rolling points I of locker pins 170 of front and rear pin holes 161 of a non-guide row 150 is set equal to a sprocket pitch S in a state where the silent chain 110 is wound around the sprocket 180 under a low load.

Description

technical field [0001] The invention relates to a silent chain transmission device composed of a silent chain and a sprocket. Background technique [0002] Conventionally, there is known a silent chain (for example, refer to Patent Document 1) having a structure as follows, in which a pair of left and right guide plates and an intermediate plate arranged between the left and right pair of guide plates are alternately connected in the chain length direction by a pair of rotating pins. The guide row constituted and the non-guide row constituted by a plurality of inner plates, and a pair of rotating pins are composed of long pins and short pins inserted in a pair of front and rear pin holes arranged on the middle plate and the inner plates . [0003] Furthermore, there is known a silent chain transmission that reliably transmits rotation between a plurality of sprockets by winding a silent chain around a plurality of sprockets. [0004] Generally speaking, in a silent chain t...

AI Technical Summary

Problems solved by technology

[0009] However, when the pitch relationship is set as described above, the silent chain wound around the sprocket under a low load condition in the initial state where no abrasion elongation occurs is as follows. The pitch becomes smaller than the sprocket pitch, so the winding of the sprocket becomes worse

[0010] As a result, the behavior of the chain becomes unstable, the string vibration sound of the silent chain becomes louder, and the meshing sound between the silent chain and the sprocket deteriorates.

[0011] In addition, even when a high load that produces elastic elongation is applied to the silent chain, since there is an area where the silent chain is not wound under tension from the sprocket, that is, the area where the silent chain is wound around the sprocket by its weight or in the The area on the sprocket where the load acting on the silent chain becomes smaller, thus causing problems such as: in this area the pitch between the points of rotation at least in the non-guiding rows becomes smaller than the sprocket pitch, likewise, For the sprocket, the winding of the silent chain becomes worse, the behavior of the chain becomes unstable, the string vibration sound of the silent chain becomes louder, or the meshing sound between the silent chain and the sprocket deteriorates

[0012] In addition, in the high-load area where the silent chain is wound under tension from the sprocket, due to strong elasticity, the force is applied in the direction in which the pitch between the turning points becomes smaller, and the force is generated in the direction of falling off the sprocket teeth. As a result, the chain teeth of the inner plate become easy to climb up from the sprocket teeth, and the so-called climbing teeth may occur

[0013] Moreover, even in the guide column, elongation of the silent chain is presupposed, as in Figure 5 As shown in the table of , since the pitch between the rotation points is made equal to or less than the pitch of the sprocket under a low load state, the winding of the silent chain to the sprocket becomes good when elongation occurs, so the same as Same problem as above for non-guided columns

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