A chain and a chain and sprocket assembly for a roller, bush, or inverted tooth chain is disclosed. The chain has at least two types of link plates having different profiles, with at least one type of link plate having a leading corner for interaction with a contact ring on the sprocket, thereby red
A chain and a chain and sprocket assembly for a roller, bush, or inverted tooth chain is disclosed. The chain has at least two types of link plates having different profiles, with at least one type of link plate having a leading corner for interaction with a contact ring on the sprocket, thereby reducing noise by reducing chordal action and by breaking up the regular timing of roller-sprocket (or bushing-sprocket) and link plate-sprocket impact. A method of reducing noise in a chain and sprocket assembly is also disclosed.
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What is claimed is: 1. A chain of a type for use with a first sprocket having a first sprocket center, a contact ring, and a plurality of teeth, wherein the chain comprises: a plurality of first links, each first link comprising a first leading engagement element and a first link plate, each first
What is claimed is: 1. A chain of a type for use with a first sprocket having a first sprocket center, a contact ring, and a plurality of teeth, wherein the chain comprises: a plurality of first links, each first link comprising a first leading engagement element and a first link plate, each first link plate having a first profile with a first leading corner, the first leading corner impacting the contact ring prior to a first impact between the first leading engagement element and the teeth, such that the first impact is delayed to a first degree; and a plurality of second links, each second link comprising a second leading engagement element and a second link plate, each second link plate having a second profile different from the first profile; wherein the first link plates and the second link plates are ordered in a sequence in the chain. 2. The chain of claim 1, wherein each second link plate has a second leading corner, the second leading corner impacting the contact ring prior to a second impact between the second leading engagement element and the teeth, such that the second impact is delayed to a second degree different than the first degree. 3. The chain of claim 2, further comprising a plurality of third links, each third link comprising a third leading engagement element and a third link plate, each third link plate having a third profile without a leading corner, such that the third link plate does not contact the contact ring prior to a third impact between the third leading engagement element and the teeth, wherein the first link plates, the second link plates, and the third link plates are ordered in the sequence. 4. The chain of claim 3, wherein the first, second, and third link plates are ordered randomly in the sequence. 5. The chain of claim 3, wherein the first, second, and third link plates are ordered in the sequence as predetermined by noise simulation testing. 6. The chain of claim 1, wherein each second link plate has a second profile without a leading corner, such that the second link plate does not contact the contact ring prior to a second impact between the second leading engagement element and the teeth. 7. The chain of claim 1, wherein the sequence is randomized. 8. The chain of claim 1, wherein the sequence is predetermined by noise simulation testing. 9. The chain of claim 1, wherein the chain is selected from the group consisting of: a) a roller chain; b) a bush chain; and c) an inverted tooth chain. 10. The chain of claim 1, wherein the chain is a single-strand chain. 11. The chain of claim 1, wherein the chain is a multi-strand chain. 12. The chain of claim 1, wherein the chain travels from a second sprocket to the first sprocket along a travel line and wherein each first leading corner impacts the contact ring and delays the first impact until a tooth of the first sprocket directly ahead of the first link is at a selected position past a radial line from the first sprocket center perpendicular to the travel line. 13. A chain and sprocket assembly, the assembly comprising: a first sprocket including a first sprocket center, a contact ring, and a plurality of teeth; and a chain comprising: a plurality of first links, each first link comprising a first leading engagement element and a first link plate, each first link plate having a first profile with a first leading corner, the first leading corner impacting the contact ring prior to a first impact between the first leading engagement element and the teeth, such that the first impact is delayed to a first degree; and a plurality of second links, each second link comprising a second leading engagement element and a second link plate, each second link plate having a second profile different from the first profile; wherein the first link plates and the second link plates are ordered in a sequence in the chain. 14. The assembly of claim 13, wherein each second link plate has a second leading corner, the second leading corner impacting the contact ring prior to a second impact between the second leading engagement element and the teeth, such that the second impact is delayed to a second degree different than the first degree. 15. The assembly of claim 14, further comprising a plurality of third links, each third link comprising a third leading engagement element and a third link plate, each third link plate having a third profile without a leading corner, such that the third link plate does not contact the contact ring prior to a third impact between the third leading engagement element and the teeth, wherein the first link plates, the second link plates, and the third link plates are ordered in the sequence. 16. The assembly of claim 15, wherein the first, second, and third link plates are ordered randomly in the sequence. 17. The assembly of claim 15, wherein the first, second, and third link plates are ordered in the sequence as predetermined by noise simulation testing. 18. The assembly of claim 13, wherein each second link plate has a second profile without a leading corner, such that the second link plate does not contact the contact ring prior to a second impact between the second leading engagement element and the teeth. 19. The assembly of claim 13, wherein the sequence is randomized. 20. The assembly of claim 13, wherein the sequence is predetermined by noise simulation testing. 21. The assembly of claim 13, wherein the chain is selected from the group consisting of: a) a roller chain; b) a bush chain; and c) an inverted tooth chain. 22. The assembly of claim 13, wherein the chain is a single-strand chain. 23. The assembly of claim 13, wherein the chain is a multi-strand chain. 24. The assembly of claim 13, wherein the chain travels from a second sprocket to the first sprocket along a travel line and wherein each first leading corner impacts the contact ring and delays the first impact until a tooth of the first sprocket directly ahead of the first link is at a selected position past a radial line from the first sprocket center perpendicular to the travel line. 25. A method of decreasing noise in a chain and sprocket assembly comprising the steps of: a) providing at least two sprockets, wherein at least one sprocket includes a plurality of teeth and a contact ring; b) providing a plurality of first links, each first link comprising a first leading engagement element and a first link plate, each first link plate having a first profile with a first leading corner, the first leading corner impacting the contact ring prior to a first impact between the first leading engagement element and the teeth; c) providing a plurality of second links, each second link comprising a second leading engagement element and a second link plate, each second link plate having a second profile different from the first profile; and d) assembling a chain for use with the at least two sprockets, wherein the first link plates and the second link plates are ordered in a sequence in the chain. 26. The method of claim 25, wherein the sequence is randomized. 27. The method of claim 25, wherein the sequence is predetermined by noise simulation testing. 28. The method of claim 25, wherein the chain is selected from the group consisting of: a) a roller chain; b) a bush chain; and c) an inverted tooth chain.
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