Abstract: [Problem] In a seal structure in which a paste gasket 20 having a property of being adhered while being hardened in an elastic state after application is interposed between bonding surfaces of at least two members 2, 3, and 6 so as to implement a seal, the paste gasket 20 is firmly adhered to one member 6 that is made of a material to which the paste gasket 20 is difficult to adhere, so as to improve the sealability at the portions of bonding of the at least two members 2, 3, and 6. [Means of Solving the Problem] At least one member 6 of the at least two members 2, 3, and 6 is formed of a material having a low density of existence of a functional group on a bonding surface of the one member. A metal thermal spray film 21 is formed on the bonding surface of the one member 6, and the paste gasket 20 is adhered to the metal thermal spray film 21.

Abstract: In a cooling unit for an engine comprising a cylinder block 1 having a water jacket 4 which opens into the surface of the cylinder block 1 and which circulates a cooling water in surrounding relationship with a cylinder bore, and a gasket 11 held sandwiched between the cylinder head and the cylinder block 1 to seal therebetween, the gasket 11 is provided with a control board 21 which project into the water jacket 4 for controlling a flow of the cooling water, the control board 21 being formed to be arcuate in conformity to the profile of the water jacket 4 and disposed toward the intake port.

Abstract: In a cooling unit for an engine comprising a cylinder block 1 having a water jacket 4 which opens into the surface of the cylinder block 1 and which circulates a cooling water in surrounding relationship with a cylinder bore, and a gasket 11 held sandwiched between the cylinder head and the cylinder block 1 to seal therebetween, the gasket 11 is provided with a control board 21 which project into the water jacket 4 for controlling a flow of the cooling water, the control board 21 being formed to be arcuate in conformity to the profile of the water jacket 4 and disposed toward the intake port.

Abstract: In a device for controlling the flow rate of a hydraulic operating fluid from a pump to a hydraulic motor for driving an engine cooling fan in a vehicle by modifying either the cross sectional opening area of a variable flow constriction means in the fluid conducting passage while maintaining a constant pressure difference across the flow constriction means by a pressure control valve responsive to the pressure difference across the flow constriction means or the pressure difference by selectively partly leaking the pressure transmitted from the downstream side of the flow constriction means to a rear side of the pressure control valve, a cold state relief means is provided to temporarily relieve the rear side of the pressure control valve at cold start of the engine to avoid abnormally high fluid pressure being supplied to the motor due to delayed response of the pressure control valve under high viscosity of the operating fluid at low temperature.