公开(公告)号：US20150203173A1

公开(公告)日：2015-07-23

申请号：US14446930

申请日：2014-07-30

Applicant: Shimano Inc.

Inventor： Yusuke NISHIMOTO ,  Mitsuru KAMIYA

IPC: B62M9/02

CPC classification number: B62M9/02 ,  B62M2009/007

Abstract: A sprocket is engageable with a chain having rollers. The sprocket includes a body and a tooth portion. The tooth portion has front and rear surfaces, a drive side surface and a non-drive side surface. The rear and front surfaces face in opposite axial directions. The drive side surface axially connects the front and rear surfaces on a downstream side. The non-drive side surface axially connects the front and rear surfaces on an upstream side. One of the front and rear surfaces has a first chamfered portion, which is formed in a radially outer portion of at least one tooth portion and tapered radially outward in the axial direction. The drive side surface has a first protrusion, which protrudes downstream in the drive rotation direction and is located radially outwardly from a contact position where the drive side surface contacts each of the rollers when the chain is driven.

Abstract translation: 链轮可与具有滚子的链条接合。 链轮包括主体和齿部。 齿部具有前表面和后表面，驱动侧表面和非驱动侧表面。 后表面和前表面面向相反的轴向。 驱动侧表面在下游侧轴向连接前表面和后表面。 非驱动侧表面在上游侧轴向连接前表面和后表面。 前表面和后表面中的一个具有第一倒角部分，该第一倒角部分形成在至少一个齿部的径向外部部分中并沿轴向径向向外渐缩。 驱动侧表面具有第一突起，其在驱动旋转方向的下游突出，并且当链条被驱动时从驱动侧表面接触每个辊的接触位置径向向外定位。