Abstract: A vehicle brake hydraulic pressure control apparatus includes a base body and a solenoid valve. The solenoid valve is attached to an attachment hole which opens on one surface of the base body. A plurality of press-fitting portions that are press-fitted to an inner peripheral surface of the attachment hole are provided on an outer peripheral surface of the solenoid valve at an interval in a hole axis direction. Contact lengths, in the hole axis direction, between the inner peripheral surface of the attachment hole and two of the press-fitting portions are different from each other.

Abstract: A vehicle brake hydraulic pressure control apparatus includes a base body and a solenoid valve. The solenoid valve is attached to an attachment hole which opens on one surface of the base body. A plurality of press-fitting portions that are press-fitted to an inner peripheral surface of the attachment hole are provided on an outer peripheral surface of the solenoid valve at an interval in a hole axis direction. Contact lengths, in the hole axis direction, between the inner peripheral surface of the attachment hole and two of the press-fitting portions are different from each other.

Abstract: A fluid pressure booster includes: a control piston in which brake operation input acts in an advancing direction, and reaction based on fluid pressure of a booster fluid pressure generation chamber that generates fluid pressure for actuating a master piston acts in a retracting direction; a pressure increasing valve provided between the booster fluid pressure generation chamber and a fluid pressure generation source so as to open at the time of advance of the control piston and close at the time of retraction of the control piston; and a pressure reducing valve provided between a release chamber and the booster fluid pressure generation chamber so as to close at the time of the advance of the control piston and open at the time of the retraction of the control piston.

Abstract: An electromagnetic valve comprising has a valve seat, a valve element movable relative to the valve seat so as to open or close a hydraulic fluid passage interposed therebetween and a plunger movable together with the valve element relative to the valve seat, wherein the valve element includes a sealing portion having an arc-shaped vertical cross section that contacts with the valve seat and an expanding diameter portion having a diameter gradually increasing in a direction from the sealing portion toward the plunger.

Abstract: A fluid pressure booster includes: a control piston in which brake operation input acts in an advancing direction, and reaction based on fluid pressure of a booster fluid pressure generation chamber that generates fluid pressure for actuating a master piston acts in a retracting direction; a pressure increasing valve provided between the booster fluid pressure generation chamber and a fluid pressure generation source so as to open at the time of advance of the control piston and close at the time of retraction of the control piston; and a pressure reducing valve provided between a release chamber and the booster fluid pressure generation chamber so as to close at the time of the advance of the control piston and open at the time of the retraction of the control piston.

Abstract: An electromagnetic valve comprising has a valve seat, a valve element movable relative to the valve seat so as to open or close a hydraulic fluid passage interposed therebetween and a plunger movable together with the valve element relative to the valve seat, wherein the valve element includes a sealing portion having an arc-shaped vertical cross section that contacts with the valve seat and an expanding diameter portion having a diameter gradually increasing in a direction from the sealing portion toward the plunger.

Abstract: An electromagnetic valve has: a coil unit including a bobbin around which a coil winding is wound, the bobbin having a central hole; a pipe body in which a fixed core is press-fitted and welded; and a valve operating unit with the pipe body inserted in the central hole of the bobbin at an one end thereof, a valve of the valve operating unit being opened or closed when the coil unit is energized, wherein, in an inserted portion of the pipe body opposed to the central hole of the bobbin, a welding portion in which a fixed core is welded is formed in a thin-wall sectional shape reduced only an outer diameter thereof, and a difference in the outer diameter between the welding portion and the inserted portion serves to absorb the swelling of a bead due to the welding.

Abstract: A normally closed electromagnetic valve has a cylindrical valve housing; a valve seat member; a fixed core; a movable core; a valve body; a return spring; and, a coil, one side of the valve housing being housed in a mounting hole opened on one end of a substrate so as to be restricted in axial movement thereof toward the interior of the mounting hole, wherein a large diameter portion is provided in the axially middle portion of the valve housing, the cylindrical valve seat member forms an annular chamber with the inner surface of the large diameter portion, the annular chamber communicates to the valve chamber, and is fixed to and fitted in one end of the valve housing and communicating holes through which the annular chamber is communicated to the exterior of the valve housing are provided in the large diameter portion.

Abstract: An electromagnetic valve has a cylindrical-shaped valve housing, a fixing core; a movable core; a first return spring; a coil; a first valve mechanism including a movable seat member, a second return spring, a first valve part, a first valve seat, and a first valve hole, and a second valve mechanism including a cylindrical-shaped valve seat member, a second valve seat, a second valve hole, and a second valve part, wherein, on the movable seat member, a cylindrical-shaped guide part, when the second valve part is seated on the second valve seat, is cut off from the valve chamber but, when the second valve part is separated from the second valve seat, forms an annular-shaped passage communicating with the valve chamber and is slidably fitted into the second valve hole; and a communication passage for allowing the annular-shaped passage to communicate with the interior of the guide part is formed.

Abstract: An electromagnetic valve has: a coil unit including a bobbin around which a coil winding is wound, the bobbin having a central hole; a pipe body in which a fixed core is press-fitted and welded; and a valve operating unit with the pipe body inserted in the central hole of the bobbin at an one end thereof, a valve of the valve operating unit being opened or closed when the coil unit is energized, wherein, in an inserted portion of the pipe body opposed to the central hole of the bobbin, a welding portion in which a fixed core is welded is formed in a thin-wall sectional shape reduced only an outer diameter thereof, and a difference in the outer diameter between the welding portion and the inserted portion serves to absorb the swelling of a bead due to the welding.

Abstract: An electromagnetic valve has a cylindrical-shaped valve housing, a fixing core; a movable core; a first return spring; a coil; a first valve mechanism including a movable seat member, a second return spring, a first valve part, a first valve seat, and a first valve hole, and a second valve mechanism including a cylindrical-shaped valve seat member, a second valve seat, a second valve hole, and a second valve part, wherein, on the movable seat member, a cylindrical-shaped guide part, when the second valve part is seated on the second valve seat, is cut off from the valve chamber but, when the second valve part is separated from the second valve seat, forms an annular-shaped passage communicating with the valve chamber and is slidably fitted into the second valve hole; and a communication passage for allowing the annular-shaped passage to communicate with the interior of the guide part is formed.

Abstract: A normally closed electromagnetic valve has a cylindrical valve housing; a valve seat member; a fixed core; a movable core; a valve body; a return spring; and, a coil, one side of the valve housing being housed in a mounting hole opened on one end of a substrate so as to be restricted in axial movement thereof toward the interior of the mounting hole, wherein a large diameter portion is provided in the axially middle portion of the valve housing, the cylindrical valve seat member forms an annular chamber with the inner surface of the large diameter portion, the annular chamber communicates to the valve chamber, and is fixed to and fitted in one end of the valve housing and communicating holes through which the annular chamber is communicated to the exterior of the valve housing are provided in the large diameter portion.

Abstract: An electromagnetic valve device includes a valve operating unit formed by disposing valve components in a valve housing having a guide cylinder and mounted to a base member, and a tip end of the guide cylinder and a housing body are magnetically connected to each other by a magnetic path defining frame surrounding a coil wound around a bobbin. The bobbin is buried in a mold section made of synthetic resin to form a coil unit. The coil unit is mounted to the base member. One end of the magnetic path defining frame is formed with a fitting bore through which the tip end of the guide cylinder is fitted, and the other end of the magnetic path defining frame is capable of abutting against the housing body. The magnetic path defining frame is mounted to a coil-correspondence portion of the mold section. The guide cylinder is loosely passed through a center bore of the bobbin.

Abstract: A hydraulic pressure controller includes: a base; a n electromagnetic valve mounted on the base and including a guide cylinder protruding from the base, a coil unit having a bobbin surrounding the guide cylinder and a coil wound on the bobbin, and a magnetic path forming frame connecting magnetically a first end and a second end of the guide cylinder; a reservoir and a damper arranged with the electromagnetic valve on the base; and a cover covering the electromagnetic valve, the reservoir and the damper, in which the cover includes a frame coupled to the base, the frame surrounding the electromagnetic valve, and a skirt portion formed integrally with the frame, the skirt portion covering the reservoir and the damper. The hydraulic pressure controller is light in weight and is improved in assembling efficiency. The hydraulic pressure controller has a reservoir water-proofing structure which is capable of preventing water from entering an outside air communicating chamber of the reservoir.