BELT TENSIONER AND METHOD FOR MAKING A BELT-TENSIONER ARM AND A SPRING CASE

摘要

A belt tensioner includes an arm (14), a spring case (16), and a helical spring (12) having inwardly projecting first and second end portions. Another belt tensioner includes a spring (12), an arm (14), a spring case (16), and a pivot bushing (24) surrounding the spring. An additional belt tensioner includes an idler pulley (20) having a bearing (36) with a mounting hole (38) and includes an arm (14) having a post (42). The post is positioned in the mounting hole, and an annular rim (44) of the post (42) is deformed radially outwardly and over the bearing (36). A method for manufacturing an arm (14) and a spring case (16) of a belt-tensioner (10) includes obtaining a belt­tensioner-arm casting mold including a first section and a second section and obtaining a belt-tensioner-spring-case casting mold including a first segment and a second segment.