Silent chain

Abstract

The aim of the invention is to provide a silent chain which realizes excellent left-and-right balance and stable engaging with low vibration in the width direction of chain through the exterior and interior random arrangement of link plate, restrains the fatigue damage of link plate and abrasion extending of chain, reduces the load of chain assembling and load of manufacturing precision. In the silent chain (100), after the inner engaging surfaces (111b) of link plates (111) which are parallel arranged on the width direction of chain with an exterior and interior random arrangement engages with the sprockets, the external engaging surfaces (111c) of the link plates (111) engage with an on-station state thereby transmitting power, wherein, the inner engaging surfaces (111b), the inner pin-hole surfaces (111a) and external engaging surfaces (111c) which are blanked by punching on the link plates (111) are provided with shearing surfaces simultaneously formed on more than 70% of the plate thickness using the gear shaving processing after punching.

Description

technical field [0001] The present invention relates to a silent chain used as an automobile timing chain, a power transmission chain for industrial machinery, and the like. Background technique [0002] Conventionally, a silent chain used for an engine or the like is configured such that link rows formed by arranging a plurality of link plates in parallel in the chain width direction are connected to each other by connecting pins inserted through the inner surfaces of the pin holes of the link plates. It is in an alternating shape, and after the inner meshing surface of the chain link plate starts to engage with the sprocket, the outer meshing surface of the chain link plate is engaged in a seated state, thereby transmitting power. [0003] In addition, these link plates are manufactured by moving the blank made of steel material to the punching position in sequence during the punching process, simultaneously forming the inner surface of the pin hole by the punching machine...

AI Technical Summary

Problems solved by technology

[0007] Therefore, as shown in Fig. 10(b), there is the following problem, that is, since the link outer dimension (W, H) of the link row 510 is larger than the plate outer dimension (w, h) of each link plate 511 (δw , δh), corresponding to it, the silent chain 500 and the sprocket are too tightly meshed during the silent chain transmission, resulting in poor meshing, vibration and noise, or meshing interference on the meshing surfaces of the two, and the wear resistance is obvious reduce

[0008] When the chain link plate 511 of the existing silent chain 500 and the sprocket are in place while meshing and winding, the chain polygonal motion will occur, so there is a problem that the vibration, noise, and tension variation of the silent chain 500 cannot be completely eliminated.

[0009] In addition, there is a problem that the inner engagement-shaped curved surface 511e, which is connected to the pair of inner engagement surfaces 511b, 511b formed on the link plate 511 and sandwiched therebetween, interferes with the teeth tips of the sprocket, and the V-shaped The tip of the V-shaped link tooth interferes with the root of the sprocket, and eccentric wear may occur on the inner engaging curved surface 511e of the link plate 511, the tip of the V-shaped link tooth, and the root of the sprocket. , chipped teeth, etc.

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