Abstract: 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.

Abstract: Bearings 18 and 19 each are formed to have an inside diameter gradually extending toward two ends along an axial direction of a shaft 20 such that the inside diameter of the bearing is smaller at the center portion thereof and is larger at the two ends thereof.

Abstract: A thickness of a valve is set smaller than a distance (inter-seat distance) in a valve thickness direction from a first seat part to a second seat part, and hence a gap between the valve and the first seat part and a gap between the valve and the second seat part are reduced to suppress seat leakage with all a variation of dimension thereof.

Abstract: An EGR valve device includes a housing having an exhaust gas passage formed inside, a support shaft slidably supported within the housing through a bearing, a valve disposed on the support shaft to open and close the exhaust gas passage, an urging member for urging the support shaft in a direction to close the valve, a valve seat, insert-cast integral with the housing, for closing the exhaust gas passage by abutting against the valve, and an actuator for driving the support shaft in a direction to open the valve, wherein a plurality of recesses or projections are provided axisymmetrically or uniformly in the peripheral portion of the valve seat to be insert-cast.

Abstract: In an EGR valve provided in an exhaust gas recirculation passage for recirculating the exhaust gas of an engine, a filter 26b is provided on the side of an exhaust gas passage 22 of a bearing 26a supporting a valve rod 25, while a diameter-reduced section 25a is provided in an area on the valve rod 25 in proximity to the filter 26b.

Abstract: 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.

Abstract: An exhaust gas recirculation valve is fabricated by fitting a valve head 24 and a cover 32 enclosing a valve rod 25 into a supporting section 31 provided at the tip of the valve rod 25, and caulking the supporting section 31 to secure the valve rod 25 and the cover 32 to the supporting section 31.

Abstract: A valve element mechanism for an exhaust gas circulation valve has: a primary eccentricity A causing a center O of a support shaft 4 rotatably provided in a housing 2 to separate from a centerline P of a seal surface 2b of a valve seat 2a with which a valve element 5 opening and closing a fluid passage by being rotated by the support shaft 4 contacts; a secondary eccentricity B causing the center O of the support shaft 4 to separate from a centerline Q of the housing 2, and a tertiary eccentricity C causing an apex G of a cone shape 6 defining a seal surface 5a of the valve element 5 and the seal surface 2b of the valve sheet 2a to position at a side opposite from the support shaft 4 and to tilt against a centerline of the housing 2.

Abstract: 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.

Abstract: An inner surface of an exhaust gas passage 22 of an EGR valve 11 is coated with Teflon coating 31 and a surface of a valve rod 25 is coated with a film 32 of chromium plating.

Abstract: 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.

Abstract: An EGR valve device includes a housing having an exhaust gas passage formed inside, a support shaft slidably supported within the housing through a bearing, a valve disposed on the support shaft to open and close the exhaust gas passage, an urging member for urging the support shaft in a direction to close the valve, a valve seat, insert-cast integral with the housing, for closing the exhaust gas passage by abutting against the valve, and an actuator for driving the support shaft in a direction to open the valve, wherein a plurality of recesses or projections are provided axisymmetrically or uniformly in the peripheral portion of the valve seat to be insert-cast.

Abstract: 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.

Abstract: An exhaust gas recirculation valve is fabricated by fitting a valve head 24 and a cover 32 enclosing a valve rod 25 into a supporting section 31 provided at the tip of the valve rod 25, and caulking the supporting section 31 to secure the valve rod 25 and the cover 32 to the supporting section 31.

Abstract: An inner surface of an exhaust gas passage 22 of an EGR valve 11 is coated with Teflon coating 31 and a surface of a valve rod 25 is coated with a film 32 of chromium plating.

Abstract: In an EGR valve provided in an exhaust gas recirculation passage for recirculating the exhaust gas of an engine, a filter 26b is provided on the side of an exhaust gas passage 22 of a bearing 26a supporting a valve rod 25, while a diameter-reduced section 25a is provided in an area on the valve rod 25 in proximity to the filter 26b.

Abstract: 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 ?m to 3.2 ?m.

Abstract: 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.

Abstract: 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.

Abstract: In a mask assembly for a color cathode ray tube, the color selection mask has the form of a thin metal plate with relatively long vertical slits alternating with vertical columns of relatively short slots, at least in the central screen area. The metal strips bounding a column of slots are joined by real bridges, which define the slots. Dummy bridges project from the metal strips into the slits, to reduce the electron beam flux transmitted through the slits to approximately the same level as the electron beam flux transmitted through the columns of slots, thereby preventing brightness irregularities on the screen. The alternate arrangement of slits and columns of slots also reduces vibration and prevents doming.