PURPOSE: To prevent the lowering of bonding strength on the metal side by thermal deterioration and also the cracking of primer layer by mixing a primer liquid containing a plasticizer to soften the primer base material into a main press-in liquid.
CONSTITUTION: Prior to press-in operations, an adhesive 7 is coated on the inner and outer surfaces of a rubber ring 6 and dried, and a press-in liquid 8 mixed with a primer liquid containing TCP plasticizer is coated on the adhesive 7. The rubber ring 6 is pressed into between a pulley rim 1 and an inner hub 3 and heated. The liquid 8 is absorbed into the ring 6, and the adhesion between the metal face and the adhesive layer is raised by the remaining primer component to strongly bond the ring 6 to the rim 1 and the hub 3. The primer liquid in an amount of 5W100pts.wt. is mixed with an aromatic process oil as the main material for the press-in liquid. In the primer liquid, 30% (in terms of solids) a primer for metal bonding is added to the plasticizer.
KANEHARA TOSHIKATSU
FUJIWARA HIDEYUKI
