PURPOSE: To enable the compaction of the whole shape without lowering efficiency by making the sectional form of the element wire of a torsion spring placed between a tension shaft and a tension arm square.
CONSTITUTION: A torsion spring 6 is compressedly inserted in a space formed between the locked part 8 of a tension arm 3 and the spring bearing part 12 of a fitting member 4. The spring 6 is square in the sectional form of its element wire, and rectangular to be more concrete. This spring 6 with the rectangular cross section is inserted concentrically with the boss part of the tension arm 3 and both end parts are brought into contact with the protrusions 10, 16 of the tension arm 3 and the fitting member 4. In addition, an automatic tensioner 1 is fixed at the other member 10 by a bolt 17 inserted in the slotted hole of the fitting member 4 and put to use by bringing an idler pulley 2 into contact with the rear face of a belt. That is to say, the spring 6 is wound in the fastening direction at the time of normal running and in the loosening direction at the tension operating time of the belt.
HASHIMOTO YASUHIRO
FUJIMOTO NAOKI
TANAKA KANEKAZU
YAMAKAWA SUSUMU
KAMIYA HIROYUKI
| JPS5872757A | 1983-04-30 |