| 摘要 |
1,131,845. Rubber bush mountings. GENERAL TIRE & RUBBER CO. 8 Dec., 1965 [11 Dec., 1964], No. 52178/65. Heading F2S. [Also in Division B5] In making a resilient bushing comprising an elastomeric insert 3, which is preferably formed by injection moulding and is oompressibly restrained between two concentric rigid sleeves 1, 2, the insert is bonded to at least one of the sleeves 1, 2 by first cleaning the corresponding surface of the sleeve, e.g. by sand blasting and de-greasing and then applying a primer coating of halogenated rubber and filler dissolved and dispersed in a suitable carrier and allowing the coating to dry by evaporating the carrier, generally a solvent, therefrom e.g. by heating up to 180‹ F. After the primer has dried an adhesive, which contains a diisocyanate, e.g. a benzidine diisocyanate, and a halogenated nitrile rubber, e.g. a chlorinated acrylonitrile rubber, dispersed and dissolved, with various fillers in a suitable carrier, is applied over the primer coating, the adhesive then being dried e.g. by heating to produce a non-tacky surface. The elastomeric insert 3, which is formed by injection moulding and preferably given a surface treatment consisting of an alkaline detergent wash and subsequent drying, is preferably covered with a suitable oil and is then assembled between the sleeves 1, 2 by any of the well known techniques and allowed to wait for several hours to disperse the lubricating oil. The surface between the insert and the sleeve is then heated to a temperature of about 260‹-300‹F. to band the parts together. A duplex bushing, Fig. 3, not shown, comprises three metal sleeves (11, 12, 13) which are treated with a primer and an adhesive in the manner as described above, an elastomeric insert (14) being first bonded to the outer sleeve and then the elastomeric insert (15), previously bonded between the inner and the middle sleeves (12, 13), is introduced into the insert (14) and bonded thereto. This kind of bushing is suitable for high axial loads e.g. heavy trucks etc. One of the contacting surfaces of a bushing may be relieved, or channelled to form a dualrate arrangement and, if desired only a portion of a contacting surface of the air insert need be bonded to a corresponding sleeve. The inner metal sleeve may be replaced by a pin, and the outer sleeve may comprise an outer housing forming e.g. part of a machine or vehicle. |
