The position of a passage separating member in the axial direction of the cylinder bores is determined by causing a spacer to contact a bottom surface of a water jacket. When the separating member is inserted in the water jacket, the width of the separating member is reduced due to elastic deformation, so that the separating member can be arranged in the water jacket. After being arranged, the separating member tightly contacts the inner surface of the water jacket due to elastic restoration force. The tight contact prevents the separating member from moving upward in the water jacket. As a result, coolant is prevented from moving between the upper portion and the lower portion with respect to the separating member. The advantages of separate cooling of the coolant in the upper and lower portions with respect to the separating member are obtained. This reliably reduces the temperature difference along the axial direction of the cylinder bore forming body.

Partition member for cooling passage of internal combustion engine, cooling structure of internal combustion engine, and method for forming the cooling structure

A cylinder bore wall insulating member has a contact surface that comes in contact with a wall surface of a cylinder bore wall that forms a cylinder block of an internal combustion engine and defines a groove-like coolant passage. An internal combustion engine in which the cylinder bore wall has a uniform temperature may be obtained using the insulating member.

Heat retention member for cylinder bore wall, internal combustion engine, and automobile

A cylinder bore wall thermal insulator is provided to a middle-lower part of a groove-like coolant passage of a cylinder block included in an internal combustion engine that includes a plurality of cylinder bores, and insulates part of a cylinder bore wall, the cylinder bore wall thermal insulator including a rubber member that comes in contact with part of a cylinder bore-side wall surface of the middle-lower part of the groove-like coolant passage that covers one cylinder bore, or covers two or more cylinder bores, a metal base member on which the rubber member is secured, and an elastic member that is provided to the metal base member, and biases the metal base member so that the metal base member presses the rubber member against the cylinder bore-side wall surface of the middle-lower part of the groove-like coolant passage, one or more elastic members being provided to each bore-covering part of the metal base member. The cylinder bore wall thermal insulator can selectively insulate an area of the cylinder bore wall that requires thermal insulation, and is rarely displaced due to vibrations or the flow of the coolant.

Cylinder bore wall heat insulation device, internal combustion engine and vehicle

PROBLEM TO BE SOLVED: To attain both of temperature rise acceleration of a cylinder head with water conduction restriction of cooling water and damage prevention of an EGR cooler, after cold start of an engine.SOLUTION: A cooling system of an engine includes: an EGR device; EGR valve control means that controls an EGR valve of the EGR device; a cooling water flow passage through which cooling water circulates, the cooling water flow passage containing a first flow passage passing through a cylinder head and a second flow passage branching from the first flow passage and passing through an EGR cooler of the EGR device; a cooling water pump that circulates cooling water in the cooling water flow passage; a flow rate control valve that controls a flow rate of cooling water in the second flow passage; temperature detection means that detects a temperature of cooling water in the first flow passage; and valve control means that controls opening of a flow rate control valve on the basis of a detection temperature. The valve control means, when the detection temperature is less than a temperature threshold and control of opening the EGR valve is not performed, has the zero opening of the flow rate control valve, and when the detection temperature is less than the temperature threshold and the control of opening the EGR valve is performed, opens the flow rate control valve.SELECTED DRAWING: Figure 9

Cooling system of engine

A water jacket spacer is inserted into a groove-like coolant passage provided to a cylinder block that is provided to an internal combustion engine, and includes a main body that has a shape that conforms to the groove-like coolant passage, and either or both of an inner wall-side contact member and an outer wall-side contact member, the inner wall-side contact member being disposed on the inner wall side of the main body along the longitudinal direction of the inner wall of the main body, and coming into contact with the cylinder bore-side wall surface of the groove-like coolant passage to divide the groove-like coolant passage situated on the inner side with respect to the water jacket spacer into an upper part and a lower part, and the outer wall-side contact member being disposed on the outer wall side of the main body along the longitudinal direction of the outer wall of the main body, and coming into contact with the outer wall surface of the groove-like coolant passage to divide the groove-like coolant passage situated on the outer side with respect to the water jacket spacer into an upper part and a lower part. An internal combustion engine in which the cylinder bore wall has a uniform temperature can be obtained using the water jacket spacer.

Water jacket spacer, internal combustion engine, and automobile

PROBLEM TO BE SOLVED: To provide a cooling structure of a cylinder block which achieves uniform cooling. SOLUTION: A cooling structure 1 of a cylinder block has a partition plate 22. A recess 21 is provided between the partition plates 22. A running water shield plate 24 is arranged at one end of the recess 21. Cooling water introduced from the direction shown by the arrow 100 flows from the bore lower part 10L to the bore upper part 10H through the recess 21 as shown by the arrow 103. COPYRIGHT: (C)2006,JPO&NCIPI

Cooling structure of cylinder block

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Cooling structure of cylinder block