Abstract: A fluid controlling electromagnetic valve is formed by mechanically fixing one axial end portion of a stator core to an annular portion of a yoke, after the primary molding of a coil bobbin, and by sandwiching flanges of the coil bobbin having a coil wound by a predetermined number of turns around the outer circumference of a guide portion, between the rear end face of the annular portion of the yoke and front end face of an annular magnetic plate. A secondary molding is performed including a piece for regulating the axial moving distance of a valve member, to mold a housing of the fluid controlling electromagnetic valve.

Abstract: A valve member includes a first communication passage for allowing a first passage to communicate with a first pressure chamber. When a pressure-receiving member contacts the valve member, a communication between the first communication passage and the first pressure chamber is shut. Magnetic force of a permanent magnet urges a shaft toward the pressure-receiving member. While a coil is not energized, when pressure inside a second passage rises, the pressure-receiving member leaves the valve member due to pressure difference between pressure inside the first pressure chamber and pressure inside a second pressure chamber, so that the first passage communicates with the second passage through the first communication passage. When the coil is energized, magnetic repelling force is introduced between a stator core and the permanent magnet, so that the pressure-receiving member and the shaft depart from the valve member to allow the first passage to communicate with the second passage.

Abstract: In an idle speed control valve, an adjusting screw is inserted into a hole of a valve body and passes through a center of a coil provided in the valve body. The adjusting screw has a ring-shaped flexible projection on its outer periphery between a head portion and a threaded portion thereof to prevent a sealing material from entering. An outer diameter of the projection is equal to or slightly larger than an inner diameter of the hole. Therefore, when the adjusting screw is inserted into the hole, a peak of the projection contacts an inner wall of the hole. The projection may be integrally molded with the adjusting screw. A ring-shaped projection may be provided on a thin wall portion of the adjusting screw.

Abstract: A fluid controlling electromagnetic valve is formed by mechanically fixing one axial end portion of a stator core to an annular portion of a yoke, after the primary molding of a coil bobbin, and by sandwiching flanges of the coil bobbin having a coil wound by a predetermined number of turns around the outer circumference of a guide portion, between the rear end face of the annular portion of the yoke and front end face of an annular magnetic plate. A secondary molding is performed including a piece for regulating the axial moving distance of a valve member, to mold a housing of the fluid controlling electromagnetic valve.

Abstract: A valve member includes a first communication passage for allowing a first passage to communicate with a first pressure chamber. When a pressure-receiving member contacts the valve member, a communication between the first communication passage and the first pressure chamber is shut. Magnetic force of a permanent magnet urges a shaft toward the pressure-receiving member. While a coil is not energized, when pressure inside a second passage rises, the pressure-receiving member leaves the valve member due to pressure difference between pressure inside the first pressure chamber and pressure inside a second pressure chamber, so that the first passage communicates with the second passage through the first communication passage. When the coil is energized, magnetic repelling force is introduced between a stator core and the permanent magnet, so that the pressure-receiving member and the shaft depart from the valve member to allow the first passage to communicate with the second passage.