Patent ID: 9255628
Filing Date: 2016-02-09
CPC Classification: F16H

Claim Text:
1. A chain tensioner with an internal combustion engine, the internal combustion engine comprising an internal combustion engine main body, a crankshaft and a crankcase, the chain tensioner comprising: a securing member secured to the internal combustion engine main body; a movable member moveable with respect to the securing member in a first direction; and a tensioner member secured to the movable member, the tensioner member being elastically deformed and arcuately bent by the movable member biased and displaced in the first direction thereof to apply tensile force to an endless chain transmitting rotation of the crankshaft; wherein the securing member has an upper securing portion in an upper portion of the securing member to be secured to the internal combustion engine main body in a bending direction of the tensioner member, and has a lower securing portion extended to a position facing an inside of the crankcase and secured to the internal combustion engine main body perpendicularly to the bending direction of the tensioner member, wherein a bottom end of the lower securing portion of the securing member is located between a top end of the tensioner member and a bottom end of the tensioner member, and the bottom end of the lower securing portion of the securing member is a lowermost end of the securing member, and wherein a relative spatial relationship between the upper securing portion and the lower securing portion of the securing member, a relative spatial relationship between the top end and the bottom end of the lower securing portion of the securing member, and a relative spatial relationship between the top end and the bottom end of the tensioner member are defined by viewing the first direction as a vertical direction with respect to a ground, wherein a lower end securing portion of the tensioner member is pivotally supported by the crankcase, and the lower securing portion of the securing member is secured above a position where the bottom end of the tensioner member is pivotally supported, wherein the securing member is pivotally supported by the lower securing portion, wherein the movable member is biased by a spring toward the lower securing portion of the securing member, the spring being provided between an upper end securing portion and the lower end securing portion of the tensioner member, wherein the lower securing portion of the securing member is located on a side opposite the tensioner member with respect to a line segment connecting the lower end securing portion with upper end securing portion of the tensioner member, wherein the spring is attached between the movable member and the securing member, and wherein a lower spring support portion of the securing member is arranged below the position of the lower securing portion of the securing member.