Abstract: A bearing device for internal combustion engines, comprising a crankshaft of an internal combustion engine and bearings supporting the crankshaft, and wherein the crankshaft is made of steel having not been subjected to surface hardening and having a structure, which is mainly composed of pearlite having the pro-eutectoid ferrite fraction of at most 3%, and is processed to have the surface roughness Rz of at most 0.8 ?m, and wherein the bearings have an aluminum bearing alloy bonded to a back plate thereof and contain, as an alloy component thereof, at least Si particles of less than 4 mass %, whereby early abrasion and scratches of the crankshaft are suppressed to be equivalent to or less than abrasion loss and scratches of conventional DCI shafts.

Abstract: A bearing device for internal combustion engines, comprising a crankshaft of an internal combustion engine and bearings supporting the crankshaft, and wherein the crankshaft is made of steel having not been subjected to surface hardening and having a structure, which is mainly composed of pearlite having the pro-eutectoid ferrite fraction of at most 3%, and is processed to have the surface roughness Rz of at most 0.8 &mgr;m, and wherein the bearings have an aluminum bearing alloy bonded to a back plate thereof and contain, as an alloy component thereof, at least Si particles of less than 4 mass %, whereby early abrasion and scratches of the crankshaft are suppressed to be equivalent to or less than abrasion loss and scratches of conventional DCI shafts.

Abstract: A fuel cell device that is designed to circulate cooling water with simplified and compact construction, without any need of a pump for circulating the cooling water, so as to reduce electric power loss. A fuel cell and a radiator are connected through a closed line via an inflow-side cooling pipe and an outflow-side cooling pipe and also the radiator is disposed under the wing of an air spoiler spaced above the fuel cell and open to outside air. With this arrangement, while the fuel cell generates electric power, the cooling water of decreased density flowing out of the fuel cell is allowed to rise through the outflow-side cooling pipe to feed it to the radiator and the cooling water of increased density that was cooled down by heat exchanging the cooling water and outside air is allowed to lower through the inflow-side cooling pipe to feed it to the fuel cell again.

Abstract: An inertia charge intake manifold is associated with an internal combustion engine having a plurality of cylinders. The intake manifold includes a plurality of elongated separate branch pipes each corresponding to a respective one of the cylinders. The intake manifold also includes a common flange for connecting a first end of each branch pipe to the internal combustion engine. The common flange has a first surface attached to the internal combustion engine. Further, the intake manifold includes a surge tank to which a second end of each branch pipe is connected. The common flange, the surge tank and each branch pipe are made of a hard thermoplastic synthetic resin. The common flange is integrally connected to the surge tank.

Abstract: A synthetic resin-made intake manifold including a volumetric air-intake section communicating with an intake air supply source through an inlet pipe and a plurality of outlet pipes for connecting the volumetric air-intake section to cylinders of an internal combustion engine is fabricated by injection molding, by applying the die rotary injection method or die slide injection method, the volumetric air-intake section and the outlet pipes respectively, thereafter, assembling them together and joining into unity, so that a synthetic resin-made intake manifold adapted for efficient production and flexible designing or including outlet pipes of a complex shape is obtained.

Abstract: An inertia charge intake manifold is associated with an internal combustion engine having a plurality of cylinders. The intake manifold includes a plurality of elongated separate branch pipes each corresponding to a respective one of the cylinders. The intake manifold also includes a common flange for connecting a first end of each branch pipe to the internal combustion engine. The common flange has a first surface attached to the internal combustion engine. Further, the intake manifold includes a surge tank to which a second end of each branch pipe is connected. The common flange, the surge tank and each branch pipe are made of a hard thermoplastic synthetic resin. The common flange is integrally connected to the surge tank.

Abstract: An inertia charge intake manifold is associated with an internal combustion engine having a plurality of cylinders. The intake manifold includes a plurality of elongated separate branch pipes each corresponding to a respective one of the cylinders. The intake manifold also includes a common flange for connecting a first end of each branch pipe to the internal combustion engine. The common flange has a first surface attached to the internal combustion engine. Further, the intake manifold includes a surge tank to which a second end of each branch pipe is connected. The common flange, the surge tank and each branch pipe are made of a hard thermoplastic synthetic resin. The common flange is integrally connected to the surge tank.