Abstract: A cooling device of a multi-cylinder engine circulates a coolant from a water pump through water jackets of a cylinder head and a cylinder block. The cooling device includes a main jacket of the water jacket of the cylinder head, formed around combustion chambers, an exhaust jacket of the water jacket of the cylinder head, communicating to the main jacket and formed on an opposite side of exhaust ports to the combustion chambers, a circulation system for suppressing that the coolant flows through the main jacket in an engine cold start, by circulating the coolant through the water pump and the exhaust jacket, and a convection suppressor for suppressing that the coolant flows into the main jacket from the water jacket of the cylinder block in the engine cold start, by suppressing a convection of the coolant inside the water jacket of the cylinder block.

Abstract: In one embodiment of the present invention, a water pump (10) is configured such that rotation is transmitted in a non-contact condition from a drive-end rotation member (20) whereto rotation is transmitted from an engine to a driven-end rotation member (30) having a pump impeller (31). The drive-end rotation member (20) includes a vacuum chamber (50) and a pair of permanent magnets (26a, 26b) provided so as to be mutually opposed with different polarities. The driven-end rotation member (30) includes an induction ring (32) having an induction section (32b) provided so as to form a prescribed interval between the pair of permanent magnets (26a, 26b). Furthermore, the pair of permanent magnets (26a, 26b) is moved in a rotation axis direction with respect to the induction section (32b) due to the vacuum introduced into the vacuum chamber (50), and the overlap amount (L1) of the pair of permanent magnets (26a, 26b) and the induction section (32b) in the rotation axis direction is changed.

Abstract: A pulley is fixed to a housing of a water pump, the pulley being connected to an output shaft of an internal combustion engine so that the pulley is driven through the output shaft. In the housing, a slider moves to and fro due to a change in pressure in a pressure chamber, which causes the magnetic flux passing through a magnet and an inductor ring of a rotary cylinder to vary, so that the driving force of the internal combustion engine is variably transmitted to the rotary cylinder. The pressure chamber is connected to an intake air passage and an atmospheric air introducing portion through a pressure path, and the state of communication is changed by a VSV. The pressure passage is provided with an orifice for preventing rapid change in pressure in the pressure chamber when the VSV is switched.

Abstract: A magnetic drive pump includes a pump chamber including an inlet port and an outlet port, a partition wall separating the pump chamber from an exterior, a rotational shaft provided at a side of the pump chamber relative to the partition wall, an impeller rotatably supported by a first end of the rotational shaft, an inductor integrally fixed to the impeller to rotate, a magnetic member positioned radially outside of the partition wall and facing the inductor, the magnetic member rotatably supported, a rotation drive device fixed to the magnetic means and actuating the magnetic member to rotate, and a drive device moving at least one of the magnetic member and the inductor in an axial direction of the rotational shaft.

Abstract: A magnetic drive pump includes a pump chamber, a partition wall separating the pump chamber from an exterior portion, an impeller disposed in the pump chamber and rotating around a rotation axis, an inductor unitarily rotating with the impeller around the rotation axis, a magnet unit disposed at a position of the exterior portion separated by the partition wall where the magnet unit faces the inductor in a radial direction of the rotation axis, the magnet unit being rotatable around the rotation axis, and a rotation driving means driving the magnet unit to rotate, wherein a displacement mechanism is provided for changing a radial distance between the magnet unit and the inductor.

Abstract: In one embodiment of the present invention, a water pump (10) is configured such that rotation is transmitted in a non-contact condition from a drive-end rotation member (20) whereto rotation is transmitted from an engine to a driven-end rotation member (30) having a pump impeller (31). The drive-end rotation member (20) includes a vacuum chamber (50) and a pair of permanent magnets (26a, 26b) provided so as to be mutually opposed with different polarities. The driven-end rotation member (30) includes an induction ring (32) having an induction section (32b) provided so as to form a prescribed interval between the pair of permanent magnets (26a, 26b). Furthermore, the pair of permanent magnets (26a, 26b) is moved in a rotation axis direction with respect to the induction section (32b) due to the vacuum introduced into the vacuum chamber (50), and the overlap amount (L1) of the pair of permanent magnets (26a, 26b) and the induction section (32b) in the rotation axis direction is changed.

Abstract: A pulley is fixed to a housing of a water pump, the pulley being connected to an output shaft of an internal combustion engine so that the pulley is driven through the output shaft. In the housing, a slider moves to and fro due to a change in pressure in a pressure chamber, which causes the magnetic flux passing through a magnet and an inductor ring of a rotary cylinder to vary, so that the driving force of the internal combustion engine is variably transmitted to the rotary cylinder. The pressure chamber is connected to an intake air passage and an atmospheric air introducing portion through a pressure path, and the state of communication is changed by a VSV.

Abstract: A magnetic drive pump includes a pump chamber including an inlet port and an outlet port, a partition wall separating the pump chamber from an exterior, a rotational shaft provided at a side of the pump chamber relative to the partition wall, an impeller rotatably supported by a first end of the rotational shaft, an inductor integrally fixed to the impeller to rotate, a magnetic member positioned radially outside of the partition wall and facing the inductor, the magnetic member rotatably supported, a rotation drive device fixed to the magnetic means and actuating the magnetic member to rotate, and a drive device moving at least one of the magnetic member and the inductor in an axial direction of the rotational shaft.

Abstract: An exhaust gas sealing system for a turbocharger includes a control valve for controlling a flow of an exhaust gas in a turbine housing, a shaft extending to an outside of the turbine housing through a bearing bore provided on the turbine housing, one end of the shaft being fixed to the control valve, and a sealing member for preventing the exhaust gas from leaking to the outside of the turbine housing through a gap formed between the bearing bore and the shaft. The sealing member includes a through-hole forming a gap with the shaft smaller than a gap formed between the bearing bore and the shaft. One side of the sealing member is pressed against a sealing face and is provided within a cavity formed in the turbine housing and including the sealing face on a peripheral side of the shaft.

Abstract: An exhaust gas sealing system for a turbocharger includes a control valve for controlling a flow of an exhaust gas in a turbine housing, a shaft extending to an outside of the turbine housing through a bearing bore provided on the turbine housing, one end of the shaft being fixed to the control valve, and a sealing member for preventing the exhaust gas from leaking to the outside of the turbine housing through a gap formed between the bearing bore and the shaft. The sealing member includes a through-hole forming a gap with the shaft smaller than a gap formed between the bearing bore and the shaft. One side of the sealing member is pressed against a sealing face and is provided within a cavity formed in the turbine housing and including the sealing face on a peripheral side of the shaft.