Bicycle rear sprocket assembly

Patent metadata

Field	Value
Publication number	US-2016272279-A1
Application number	US-201615168214-A
Country	US
Kind code	A1
Filing date	May 30, 2016
Priority date	Feb 5, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

A bicycle rear sprocket assembly has a rotational center axis. The bicycle rear sprocket assembly comprises a first sprocket and a second sprocket. The first sprocket includes a first sprocket body and a first chain-engagement structure. The first sprocket body is made of a non-metallic material. The first chain-engagement structure is made of a metallic material and is configured to engage with a bicycle chain. The second sprocket includes a second sprocket body and a second chain-engagement structure. The second sprocket body is made of a non-metallic material and attached to the first sprocket body. The second chain-engagement structure is made of a metallic material and is configured to engage with the bicycle chain.

First claim

What is claimed is:

1 . A bicycle rear sprocket assembly having a rotational center axis, the bicycle rear sprocket assembly comprising:
a first sprocket including
a first sprocket body made of a non-metallic material, and
a first chain-engagement structure made of a metallic material and configured to engage with a bicycle chain; and
a second sprocket including
a second sprocket body made of a non-metallic material and attached to the first sprocket body, and
a second chain-engagement structure made of a metallic material and configured to engage with the bicycle chain.

2 . The bicycle rear sprocket assembly according to claim 1 , wherein
the first sprocket body and the second sprocket body provide a base portion having a truncated conical shape

3 . The bicycle rear sprocket assembly according to claim 1 , wherein
the first chain-engagement structure of the first sprocket includes
a first annular member, and
a plurality of first teeth circumferentially arranged on an outer periphery of the first annular member,
the second chain-engagement structure of the second sprocket includes
a second annular member, and
a plurality of second teeth circumferentially arranged on an outer periphery of the second annular member,
the first annular member is at least partly embedded in the first sprocket body, and the second annular member is at least partly embedded in the second sprocket body.

4 . The bicycle rear sprocket assembly according to claim 3 , wherein
the first annular member is at least partly embedded in the first sprocket body by integral molding, and the second annular member is at least partly embedded in the second sprocket body by integral molding.

5 . The bicycle rear sprocket assembly according to claim 1 , wherein
the first sprocket body is attached to the second sprocket body by adhesive.

6 . The bicycle rear sprocket assembly according to claim 1 , wherein
the first sprocket body is attached to the second sprocket body through a concavo-convex structure.

7 . The bicycle rear sprocket assembly according to claim 1 , further comprising:
a tubular member positioned coaxially with the rotational center axis, wherein the tubular member has a hub engagement profile configured to engage with a bicycle hub assembly.

8 . The bicycle rear sprocket assembly according to claim 7 , further comprising:
an internal space provided between the base portion and the tubular member in a radial direction with respect to the rotational center axis.

9 . The bicycle rear sprocket assembly according to claim 1 , wherein
the first sprocket body and the second sprocket body are integral with each other as a single unitary member.

10 . The bicycle rear sprocket assembly according to claim 1 , wherein
the second sprocket body is directly attached to the first sprocket body.

11 . The bicycle rear sprocket assembly according to claim 1 , wherein
the second sprocket body is attached to the first sprocket body via an intervening member.

12 . The bicycle rear sprocket assembly according to claim 11 , wherein
the intervening member is made of a metallic material.

13 . The bicycle rear sprocket assembly according to claim 11 , wherein
the intervening member has a hub engagement profile configured to engage with a bicycle hub assembly.

14 . The bicycle rear sprocket assembly according to claim 1 , wherein
the first sprocket body has a first hub engagement profile configured to engage with a bicycle hub assembly.

15 . The bicycle rear sprocket assembly according to claim 14 , wherein
the second sprocket body has a second hub engagement profile configured to engage with the bicycle hub assembly.

Assignees

• Shimano Kk

Inventors

• Yoshida Toyoshi
• Oishi Toshinari
• Fukumori Tsuyoshi

Classifications

• B62M9/12 Primary

  the chain, belt, or the like being laterally shiftable {, e.g. using a rear derailleur} · CPC title

• B62M9/10 Primary

  involving different-sized wheels, {e.g. rear sprocket chain wheels} selectively engaged by the chain, belt, or the like {(bicycle hubs rotatably arranged on axle B60B27/023)} · CPC title

• F16H55/303

  for round linked chains, i.e. hoisting chains with identical links · CPC title