Abstract This invention is directed to multi polymer structures for internal combustion engines, as well as structures for other vehicle drive train parts. For example, a valve rocker cover for an internal combustion engine in accordance with this invention is a composite of at least two different molded thermoplastic resins, which structure comprises a valve cover body molded of a polybutylene terephthalate resin and a sealing flange molded of a polyetherimide resin, with both parts in a bonding relationship. The valve rocker cover can also have attached to the underside a sealent so as to provide a seal between the valve cover and engine block when so assembled. The method of producing a composite in accordance with this invention is either insert molding or coinjection molding.
A thermoplastic molded composite rocker valve cover structure used in combination with a drive train of an internal combustion engine comprising at least two different molded thermoplastic resin components which are in bonding relationship, said rocker valve cover comprising a body of said cover and a sealing flange, said body being polybutylene terephthalate, and said sealing flange being polyetherimide.
Claim 2
Dependent Claim
59 words
A thermoplastic molded composite rocker valve cover structure used in combination with a drive train of an internal combustion engine comprising at least two different molded thermoplastic resin components which are in bonding relationship, said rocker valve cover comprising a body of said cover and a sealing flange, said body being polybutylene terephthalate, and said sealing flange being polyetherimide.
Claim 3
Dependent Claim
33 words
The molded composite rocker valve cover claim 1 having a sealent attached to the underside the sealing flange so as to provide a seal between the rocker valve cover and an engine block.
Claim 4
Dependent Claim
16 words
The molded composite valve cover of claim 2 wherein the sealent is a silicone elastomeric polymer.
Claim 5
Dependent Claim
15 words
The molded thermoplastic composite article of claim 1 prepared by the process of coinjection molding.