Transmission chain for use in engine

Abstract

provided is a transmission chain for an engine, which alleviates plunge relative to a hump bending guide surface to cause an orbit stable, and increases intension of a plate meeting with fatigue ruption caused by easy concentration of strengthening force of the chain, and saves lubricating oil reliably between a chain guide and the plate to bring into play excellent durability. The transmission chain for an engine (100) is disclosed, wherein sliding contact parts (112, 152) of a guide of an inner plate (110) and an outer plate (150) are composed of a pair of front and rear flat surfaces (112a, 152a), a pair of front and rear plate hump curved surfaces (112b, 152b) and an lubricating oil holding curved surfaces (112c, 152c). Arrangement interval in a plate length direction of a boundary (Y) of the plate flat surfaces (112a, 152a) and the plate hump curved surfaces (112b, 152b) is set shorter than a chain interval (P).

Description

technical field [0001] The present invention relates to an engine transmission chain used in an automobile engine, and particularly relates to a timing drive chain and a balance chain between a crankshaft and a camshaft, and an engine transmission chain used in an auxiliary machine driving chain such as an oil pump, etc. . Background technique [0002] Generally, in an automobile engine, there is a transmission device that transmits power through a transmission chain that hangs on the driving side sprocket and the driven side sprocket. As such a transmission chain, such as Figure 10 As shown, there is a known method of retaining lubricating oil on the guide-facing sides by forming guide-facing curved surfaces 511, 551 on respective guide-facing side peripheral portions of the inner link plate 510 and the outer link plate 550. The drive chain 500 reduces the friction generated between the arcuate chain guide G1 and the linear chain guide G2 on the curved surfaces 511, 551 (f...

AI Technical Summary

Problems solved by technology

[0005] However, in the conventional transmission chain 500 as in Patent Document 1, the guide facing curved surfaces 511, 551 are formed to have a width equal to or greater than the chain pitch P of the inner link plate 510 and the outer link plate 550, like Figure 10 As shown, the plate part E where fatigue failure may occur due to the most likely concentration of chain tensile force, that is, along the center of the sleeve press-in hole 512 passing through the inner link plate 510 or the pin hole 552 of the outer link plate 550 A portion F of the plate portion E near the imaginary line extending in the chain width direction has a cutout shape, so the plate portion E acts on the plate portion E due to sliding contact with the arcuate chain guide G1 or the linear chain guide G2. stress, there is a possibility of chain breakage, further measures need to be implemented in order to increase the strength of such a plate part E

[0006] In addition, if Figure 10 As shown, since the inner link plate 510 or the outer link plate 550 is in contact with the linear chain guide G2 in the small contact area indicated by the contact points Z, Z, so when the linear chain guide G2 and the guide If the lubricating oil cannot be sealed and retained between the opposing curved surfaces 511 and 551 of the device, sliding resistance may occur between the two, impairing the durability of the inner link plate 510 and the outer link plate 550

[0007] In addition, by forming guider facing curved surfaces 511, 551 on the peripheral edge portion of the guider facing side, as Figure 10 As shown, the arc-shaped chain guide G1 enters into the guide opposing curved surfaces 511, 551 to cause the chain to sink into the arc-shaped chain guide G1. relaxation occurs on the chain track becomes unstable

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