Abstract: A fluid control valve includes a valve-side housing and an actuator-side housing. The valve-side housing includes a first facing plane portion that faces a second facing plane portion of the actuator-side housing and a first connection portion arranged at an outer side region of the first facing plane portion. The actuator-side housing includes the second facing plane portion and a second connection portion arranged at an outer side region of the second facing plane portion. The valve-side housing and the actuator-side housing are connected to each other via the first connection portion and the second connection portion such that a space is provided between the first facing plane portion and the second facing plane portion. The first facing plane portion of the valve-side housing includes a depression portion that is recessed in a direction away from the second facing plane portion of the actuator-side housing.

Abstract: A core segment linked body when opened out rectilinearly is configured: such that a distance between adjacent width reduced portions is greater than a width dimension of width expanded portions when adjacent core segments are in an expanded position, and the distance between the adjacent width reduced portions is less than the width dimension of the width expanded portions when the adjacent core segments are in a contracted position; and so as to satisfy (te?tn)/?s?>0, and 0<(te?tn)/te?0.27, where ?s? is a distance between center lines of the adjacent magnetic pole teeth in the expanded position, te is a width dimension of tooth main portions, and to is the width dimension of the width reduced portions.

Abstract: Provided is a vertical machining center including: a splash cover fixed to a base, the splash cover defining a machining chamber to enclose a machining zone; a column vertically standing on the base; a Z-axis guiding rail disposed on the column and being vertically directed toward the base, the Z-axis guiding rail partially exposed to the machining zone; a Z-axis driving device disposed in the column, the Z-axis driving device partially exposed to the machining zone; a spindle head to be driven vertically by the Z-axis driving device; a spindle head opening formed in the splash cover so that the spindle head can pass through the spindle head opening; and an extendable cover provided between an edge of the spindle head opening and the spindle head and configured to cover parts of the Z-axis guiding rail and the Z-axis driving device, the parts being exposed to the machining zone.

Abstract: A bearing holding structure 7 has a substantially cylindrical sleeve 71 and a plate-shaped pressing plate 77. A tubular portion 72 of the sleeve 71 includes a housing press-fit portion 73 having an outer peripheral surface to be press-fit into a recess 12 of an upper housing 11, and a bearing press-fit portion 74 having an inner peripheral surface to be press-fit thereinto by a bearing 6. A pullout prevention portion 75 that protrudes inward to prevent pullout of the bearing 6 is formed at one end of the tubular portion 72, and the pressing plate 77 is press-fit into the other end thereof.

Abstract: A rotation axis O2 of a shaft 3 is attached thereto with double-offset in the X and Y directions with respect to a center line O1 of a valve seat 2. A bevel process is implemented on the outer peripheral surface of a valve 1 such that the valve 1 and the valve seat 2 is line-sealed, and the sign of the angles of inclination is switched between plus and minus at two places of the outer peripheral surface of the valve 1 deviated from the center of the axis. Further, a section where the angle of inclination is constant is prepared in each of the sections connecting the two places, while the other sections are smoothly connected to each other.

Abstract: A valve opening and closing mechanism includes: an input shaft 2 driven by a power source; two or more output shafts 5, 6 respectively including valves 3, 4; power transmission members that transmit power from the input shaft 2 to the respective output shafts 5, 6 with varying a phase of the power; and preload application members that apply preloads respectively to the output shafts 5, 6 and the power transmission member in opposite directions. The output shafts 5, 6 may be separated from the power transmission member.

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: An exhaust gas recirculation valve includes an exhaust passage having an exhaust gas inlet and an exhaust gas outlet aligned on the same line, an EGR passage branched from the exhaust passage, a shaft attached rotatably at a branching point between the exhaust passage and the EGR passage, and an elliptically shaped butterfly valve rotating integrally with the shaft to open/close the exhaust passage and the EGR passage.

Abstract: A valve 33 has a deformed circular shape such that a diameter in an axis orthogonal direction that is orthogonal to a rotation center axis X is longer than that in an axial direction that is parallel to the rotation center axis X, and a front surface of a semicircle on one side of the valve and a rear surface of a semicircle on the other side thereof about the rotation center axis X as a boundary are abutted against valve seats 34a.

Abstract: An actuator unit 10 and a valve unit housing 31 provided with a fluid passage 34 are formed separately, and a water cooling passage 29 is disposed therebetween; components such as a bearing 24, a return spring 28, and a gear 23 that directly couples the actuator unit 10 to a valve shaft 32 are disposed on the side of the actuator unit 10 that is interposed by the water cooling passage 29.

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 plate 36 is press-fitted on the outer peripheral surface of a rod 32 to eliminate a gap between the rod 32 and the plate 36, and further the pressurization produced by the pressure of gas leaking from a gas passage 38 and the load of a washer 26 is caused to act on the rod 32 to thereby positively abut the plate 36 united with the rod 32 against a bush 35.

Abstract: A rotation axis O2 of a shaft 3 is attached thereto with double-offset in the X and Y directions with respect to a center line O1 of a valve seat 2. A bevel process is implemented on the outer peripheral surface of a valve 1 such that the valve 1 and the valve seat 2 is line-sealed, and the sign of the angles of inclination is switched between plus and minus at two places of the outer peripheral surface of the valve 1 deviated from the center of the axis. Further, a section where the angle of inclination is constant is prepared in each of the sections connecting the two places, while the other sections are smoothly connected to each other.

Abstract: A valve opening and closing mechanism includes: an input shaft 2 driven by a power source; two or more output shafts 5, 6 respectively including valves 3, 4; power transmission members that transmit power from the input shaft 2 to the respective output shafts 5, 6 with varying a phase of the power; and preload application members that apply preloads respectively to the output shafts 5, 6 and the power transmission member in opposite directions. The output shafts 5, 6 may be separated from the power transmission member.

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.