摘要:
An attaching system of an exhaust gas recirculation valve includes: an attachment unit 2 to be communicated with an exhaust gas circulation passage of an internal combustion engine; and an exhaust gas recirculation valve 1 that is fitted to the attachment unit and that has an exhaust gas passage to be communicated with the exhaust gas circulation passage, wherein the exhaust gas recirculation valve has a water-cooled passage 12 to be communicated with a water-cooled passage 15 for cooling the exhaust gas passage provided with the attachment unit, when fitted to the attachment unit.
摘要:
In an exhaust gas recirculation valve device, a sealing member 15 supported by a plug 15c is disposed between a portion of a housing 1 on an exhaust gas passage side of a bearing 8, and a valve shaft 7.
摘要:
An assembly method includes a step of press-fitting a second valve 27 to a valve shaft 29 to which a first valve 25 is press-fitted and secured while measuring and adjusting a distance L2 so that it becomes equal to a distance L1. Thus, the first valve 25 and second valve 27 are press-fitted to the valve shaft 29 and those components are swaged together so that the first and second valves are secured to the valve shaft, and oil is placed in a press-fitted portion. When components, such as the first valve 25, are sintered parts, oil contained in the sintered parts themselves is used for increasing a joining force that occurs in the press-fitted portion.
摘要:
An EGR valve device includes a valve housing having one or more exhaust-gas inlet ports and two or more exhaust-gas outlet ports, and forming an exhaust-gas passage communicated with these exhaust-gas inlet ports and exhaust-gas outlet ports; two valve-sheets disposed on the inner peripheral face of the valve housing; a valve shaft assembled into the valve housing; and two valves secured on the valve shaft, and simultaneously abutting on the respective valve-sheets when the valve shaft moved in one direction. It is arranged that the valve housing is formed of material having an axial thermal expansion coefficient larger than that of the valve shaft, and that the distance between the two valve-sheets is set so as to equal with that between the valves at the normal temperature.
摘要:
An EGR valve device includes a valve housing having one or more exhaust-gas inlet ports and two or more exhaust-gas outlet ports, and forming an exhaust-gas passage communicated with these exhaust-gas inlet ports and exhaust-gas outlet ports; two valve-sheets disposed on the inner peripheral face of the valve housing; a valve shaft assembled into the valve housing; and two valves secured on the valve shaft, and simultaneously abutting on the respective valve-sheets when the valve shaft moved in one direction. It is arranged that the valve housing is formed of material having an axial thermal expansion coefficient larger than that of the valve shaft, and that the distance between the two valve-sheets is set so as to equal with that between the valves at the normal temperature.
摘要:
A first magnetic substance and a second magnetic substance are arranged opposite to each other with a gap left therebetween; a holding member being arranged in the gap; a magnetic field generator being secured to the holding member; the generator being arranged adjacent to the first magnetic substance or the second magnetic substance, thereby increasing an magnetic attraction generated by a magnetic force between the generator and the first magnetic substance or the second magnetic substance. A slide between a sliding portion of a supporting member and that of the holding member is permitted only on the magnetic substance side to which the magnetic field generator stands close, which relaxes the requirements of dimensional accuracy such as the height of the holding member.
摘要:
A valve shaft 8 and a drive shaft 11 of an EGR valve 1 are butted to each other; protrusions 26a, 26b, 27a, and 27b formed on the inner sides of cotter members 24, 25 of a cotter 23 are engaged with grooves 21, 22 respectively formed on the outer peripheral surfaces of the ends of the shafts 8, 11; the urging force of a spring 28 for exerting an urging force in the closing direction of valve disks 6, 7 on the cotter 23 is applied to the cotter 23 through a spring holder 30 to press the protrusions 26a, 26b, 27a, and 27b to the grooves 21, 22.
摘要:
A surface of a valve rod of an EGR valve is plated with chromium plating, and then the surface of the chrome plating is polished to the maximum height surface roughness of 1.0 μm to 3.2 μm.
摘要:
A metallic member 22 is integrated with a molded rotor 12, and a bearing 16 is held to the rotor 12 through this metallic member 22. At that time, a washer 24 is secured to the metallic member, and the rotating portion of the bearing is held by this washer, thereby improving holding property and durability of the bearing. A stopper plate 21 for limiting the displacement of the output shaft of a motor is used as the metallic member, thereby enabling holding property and durability of the bearing to increase without increasing the number of components. The base-end side of the metallic member 22 is integrally in-mold molded with the rotor 12, which enables the metallic member 22 to be firmly held.
摘要:
A first magnetic substance and a second magnetic substance are arranged opposite to each other with a gap left therebetween; a holding member being arranged in the gap; a magnetic field generator being secured to the holding member; the generator being arranged adjacent to the first magnetic substance or the second magnetic substance, thereby increasing an magnetic attraction generated by a magnetic force between the generator and the first magnetic substance or the second magnetic substance. A slide between a sliding portion of a supporting member and that of the holding member is permitted only on the magnetic substance side to which the magnetic field generator stands close, which relaxes the requirements of dimensional accuracy such as the height of the holding member.