Other

Yasuo Sunaga

Masatoshi Hada

Munehiro Sagata

An air-intake manifold includes a plurality of air-intake pipes connecting between a collector and an air-intake pipe mount. Each air-intake pipe is bent to have a predetermined shape. Each air-intake pipe is fabricated by bending a substantially straight double metal pipe that has an outer pipe and an inner pipe with a clearance therebetween equal to or less than 0.2 mm, such that the outer pipe and the inner pipe locally contact with each other at an intermediate region. Accordingly, while the outer pipe and the inner pipe of the air-intake pipe locally contact with each other at the contact point (in the relatively slidable relationship), an air layer having a thickness equal to or less than about 0.2 mm is formed between the outer pipe and the inner pipe at portions except for the contact point

Intake manifold for internal combustion engine

An intake manifold has a plurality of branch tubes each joined by brazing in a furnace at one end to a flange on the engine side and at the other end to a surge tank on the throttle chamber side. The surge tank is separated into two pieces or a brazing side member and a non-heating side member. Branch tubes are fixed in position relative to the brazing side member by peen locking with a peening tool or the like and are then joined to the brazing side member by brazing in the furnace. The non-heating side member is not subjected to the brazing in the furnace but is joined to the brazing side member by bolts or the like.

Intake manifold

A method of securing intake tubes in an intake manifold is provided in which leakage of brazing material from the joint between the intake tubes and the intake tube mounting rings is prevented. For securing each intake tube in the intake manifold, the intake tube,is fitted into the intake tube mounting ring,Then, a jig,of a tubular shape is inserted into insert areas of the intake tube,and the intake tube mounting ring,The jig,includes separate sections,defined by slits extending to a predetermined length in parallel to the axis and has a plurality of projections,and,provided on the outer side of the separate sections,thereof. A bar-like pressing tool,reduced in the diameter towards its front end is inserted into the interior of a tubular shape of the peen locking jig,and it is then advanced relatively towards the insert area by the action of pressing means. As a result, the projections,and,are dislocated radially and press the outer side of the intake tube,against the inner side of the intake tube mounting ring,to join each other by the effect of plastic deformation.

Method of securing intake tubes in intake manifold

A mounting structure is provided for an EGR valve or an EGR tube. The EGR valve or the EGR tube is made of stainless steel or cast iron which is high in the physical strength at a high temperature. The EGR valve or the EGR tube is mounted to an intake manifold made of aluminum by means of bolts or stud bolts. The EGR valve or the EGR tube has female threads provided therein into which the bolts or stud bolts are screwed. The intake manifold has through holes provided therein through which the bolts or stud bolts extend.

Mounting structure for EGR valve or EGR tube

A surge tank structure in an intake manifold has a serge tank to which a plurality of branch tubes are joined at one end. The branch tubes are joined at the other end to a cylinder head mounting flange, and one end of each branch tube in the surge tank is enlarged to have a horn-like shape. The serge tank comprises a main body and a top plate. The main body has through holes provided therein for accepting the branch tubes and has its top side opened. The top plate is joined in a plane to the top of the main body. The main body has a bottom which has engagement recesses formed by raised portions, so that each engagement recess has a horn-like surface that conforms to the horn-like shape of one end of each branch tube.

Growing community of inventors

Koga, Japan

Yasuo Sunaga