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US 2003/0192299 A1Published application
Wear resistant chain
AssigneeNone recorded
InventorsArimasa Kaga, Toshifumi Satoh
Life of this patent
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AssigneeNone recorded
InventorsArimasa Kaga, Toshifumi Satoh
Estimating the term…
A wear resistant chain, which smoothly articulates and slides for a long period of time without generating unusual wear elongation even if used together with an extremely deteriorated lubricating oil having a high degree of oxidation, has both ends of a bushing are force-fit into bushing holes of a pair of inner plates respectively and both ends of a connecting pin which is rotatably mounted into the bushing are force-fit into pin holes of a pair of outer plates disposed on both of the outer sides of the pair of inner plates. The bushing uses the base material of one steel selected from an austenite stainless steel, a martensite stainless steel, a precipitation-hardening steel, a high-carbon chromium bearing steel and an alloy tool steel each subjected to heat curing.
A wear resistant chain comprising a bushing having two ends, a pair of inner plates having bushing holes, said bushing ends being force-fit into said bushing holes, a pair of outer plates having pin holes, and a connecting pin, said connecting pin rotatably mounted in said bushing and having two ends force-fit into said pin holes, said pair of outer plates being disposed on the outer sides of said inner plates, wherein said bushing has a base material of one steel selected from an austenite stainless steel, a martensite stainless steel, a precipitation-hardening steel, a high-carbon chromium bearing steel and an alloy tool steel each subjected to heat curing.
A wear resistant chain comprising a bushing having two ends, a pair of inner plates having bushing holes, said bushing ends being force-fit into said bushing holes, a pair of outer plates having pin holes, and a connecting pin having two ends, said connecting pin being rotatably mounted in said bushing and both ends of said connecting pin being force-fit into said pin holes, said pair of outer plates being disposed on the outer sides of both of said inner plates, wherein a coating of at least one material selected from TiN, CrN, DLC, Al2O3, Mo, TiAlN, TiC, TiCN, AlN, Si3N4, SiC and NiP is formed on at least the inner surface of said bushing.
Dependencies are inferred from the claim text.
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Driving-chains: with links connected by parallel driving-pins with or without rollers so-called open links
Sorting, feeding, assembling, riveting, or finishing parts of chains: assembling or disassembling
Of roller-chain or other plate-link type: combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts
Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor: for chains, for chain links
Term end not estimated
The present invention relates to bushing chains and roller chains, which are used in power transmission mechanisms or carrying mechanisms in vehicles and industrial machines and the like.
As power transmission media used in power transmission mechanisms of vehicles metallic bushing chains and roller chains have been recently increasingly adopted in place of toothed belts, which have often been used from the demands of high load, high speed and making maintenance free.
A conventional chain, for example a bushing chain is formed/such that both ends of a cylindrical bushing are force-fit into bushing holes of a pair of inner plates respectively and both ends of a connecting pin rotatably mounted into the bushing are force-fit into pin holes of a pair of outer plates disposed on both of the outer sides of the pair of inner plates. Further, a bushing chain is formed such that a roller is rotatably mounted on a bushing of a bushing chain.
FIG. 1 is a perspective view showing a part of a wear resistant chain of the present invention; and
FIG. 2 is a graph showing test results of wear resistance of the wear resistant chain of the present invention.
Embodiments of the present invention will now be described based on Examples 1 and 2 with reference to FIGS. 1 and 3.
FIG. 1 is a perspective view showing one example of a wear resistant chain of the present invention. In the wear resistant chain 10 both ends of a bushing 12 are force-fit into bushing holes 11a of a pair of inner plates 11 respectively and both ends of a connecting pin 15 rotatably mounted into said bushings 12 are force-fit into pin holes of a pair of outer plates 14 disposed on both of the outer sides of said pair of inner plates 11. Then a roller is rotatably mounted on said bushing 12. In FIG. 1, as can be understood an assembly structure of a chain perspective views of respective parts of the chain are shown together with the entire perspective view of the chain. Although the wear resistant chain shown in FIG. 1 is a roller chain in which the roller 13 was rotatably fitted around the bushing 12, the wear resistant chain of the present invention is not limited to the roller chain and a bushing chain having no roller may be used.
Here, in Example 1, as the base material of the bushing 12a SUS 304 (18% Cr-8% Ni), which is an austenite stainless steel, was used and the base material was subjected to a Tuftride process, called as salt bath soft-nitriding, which is one of nitriding processes. Further, in Example 2, as the base material of the bushing 12 a SCM 435, which is a conventional chromium-molybdenum alloy steel, was used and the inner surface of the bushing 12 was subjected to nickel-phosphorus (NiP) alloy plating by an electroless plating process. In this case, as the material of connecting pins 15, inner plates 11 and outer plates 14 in Examples 1 and 2, a conventional chromium-molybdenum alloy steel (SCM 435) subjected to a carbonitriding process was used.