Abstract: A pump apparatus installed in a cooling system of an internal combustion engine includes: a first housing member having a generally circular recess portion; a pump rotor placed within the recess portion; and a second housing member that is fixed to the first housing member so as to define a pump operation chamber that corresponds to the recess portion. The first housing member includes a housing body portion in which the recess portion is formed, and a discharge-side cylindrical portion formed integrally with the housing body portion so as to define a discharge passageway of the cooling water. The second housing member includes a cover portion that covers an opening end side of the recess portion, and a suction-side cylindrical portion that is formed integrally with the cover portion so as to define a suction passageway of the cooling water.

Abstract: A pump apparatus installed in a cooling system of an internal combustion engine includes: a first housing member having a generally circular recess portion; a pump rotor placed within the recess portion; and a second housing member that is fixed to the first housing member so as to define a pump operation chamber that corresponds to the recess portion. The first housing member includes a housing body portion in which the recess portion is formed, and a discharge-side cylindrical portion formed integrally with the housing body portion so as to define a discharge passageway of the cooling water. The second housing member includes a cover portion that covers an opening end side of the recess portion, and a suction-side cylindrical portion that is formed integrally with the cover portion so as to define a suction passageway of the cooling water.

Abstract: A piston top surface (23) has a depression. A center region (28A) is formed at the center of the depression to secure the diameter of a center tumble flow to be large. A side region (28B) is formed on both sides of the piston top surface to generate a side tumble flow that is not influenced by a cylinder bore inner wall and has a flow line generally parallel to that of the center tumble flow.

Abstract: A coolant passage in a cylinder head of a multi-cylinder internal combustion engine is divided into an intake-side passage below intake ports and extending in a cylinder arranging direction, and an exhaust-side passage including plural exhaust-side lateral passages corresponding to respective cylinders and an exhaust-side longitudinal passage. The exhaust-side lateral passages (1) are mutually separated by partition walls at a position corresponding to the section between a corresponding adjacent pair of the cylinders, (2) have an inlet for coolant in the vicinity of exhaust ports of a corresponding one of the cylinders, and (3) extend from the inlet toward the intake port via the vicinity of a top of a combustion chamber formed in the corresponding cylinder. The exhaust-side longitudinal passage extends along the cylinder arranging direction. Downstream ends of the exhaust-side lateral passages connect to the exhaust-side longitudinal passage.

Abstract: In an intake system for an internal combustion engine wherein a partition plate is provided within an intake pipe in a longitudinal direction so that an inside is divided into a first intake passage, which is an upper side passage of the above described intake pipe, and a second intake passage, which is a lower side passage of the above described intake pipe, and an intake control valve for opening and closing the second intake passage is provided, the partition plate has holes which connect the first intake passage to the second intake passage and allow fuel on a lower surface of the partition plate to be sucked out to the first intake passage. When an intense tumble flow is created in the first intake passage in the intake system, an air flow toward the first intake passage from the second intake passage is created in the holes so that the fuel that adheres to the partition plate can be sucked out.

Abstract: A piston top surface (23) has a depression. A center region (28A) is formed at the center of the depression to secure the diameter of a center tumble flow to be large. A side region (28B) is formed on both sides of the piston top surface to generate a side tumble flow that is not influenced by a cylinder bore inner wall and has a flow line generally parallel to that of the center tumble flow.

Abstract: In an intake system for an internal combustion engine wherein a partition plate is provided within an intake pipe in a longitudinal direction so that an inside is divided into a first intake passage, which is an upper side passage of the above described intake pipe, and a second intake passage, which is a lower side passage of the above described intake pipe, and an intake control valve for opening and closing the second intake passage is provided, the partition plate has holes which connect the first intake passage to the second intake passage and allow fuel on a lower surface of the partition plate to be sucked out to the first intake passage. When an intense tumble flow is created in the first intake passage in the intake system, an air flow toward the first intake passage from the second intake passage is created in the holes so that the fuel that adheres to the partition plate can be sucked out.

Abstract: A coolant passage in a cylinder head of a multi-cylinder internal combustion engine is divided into an intake-side passage below intake ports and extending in a cylinder arranging direction, and an exhaust-side passage including plural exhaust-side lateral passages corresponding to respective cylinders and an exhaust-side longitudinal passage. The exhaust-side lateral passages (1) are mutually separated by partition walls at a position corresponding to the section between a corresponding adjacent pair of the cylinders, (2) have an inlet for coolant in the vicinity of exhaust ports of a corresponding one of the cylinders, and (3) extend from the inlet toward the intake port via the vicinity of a top of a combustion chamber formed in the corresponding cylinder. The exhaust-side longitudinal passage extends along the cylinder arranging direction. Downstream ends of the exhaust-side lateral passages connect to the exhaust-side longitudinal passage.