Patent ID: 7438276

Claim:
A linear-controlled electromagnetic valve for brake control having a sleeve including a cylindrical portion and a bottom face, and which is formed into a cup shape having an end side that is an opening portion; a coil provided on an outer periphery of the sleeve; a plunger, which is accommodated within the sleeve, for sliding along inner side surface of the sleeve by energization of the coil; a shaft provided with a spherical valve body, for moving in accordance with the sliding of the plunger; a guide formed from a magnetic body and provided with a guide hole, which hold the shaft, and keeps its sliding and an attraction face that faces an end face of the plunger, the guide formed such that the attraction face is inserted in the sleeve; and a seat portion including a valve seat, which the valve body comes in contact with and separates from, and a communicative passage that opens and closes based on the contact and separation of the valve body with respect to the valve seat, wherein an attraction force in accordance with the energization current to the plunger makes the valve body come in contact with the valve seat, a resistance force in the opposite direction of the attraction force to the shaft makes the valve body separate the valve seat, by the attraction force and the resistance force, the valve body moves over a range where a stroke of the valve body from the valve seat is zero up to a maximum value, a gap of 0.2 mm or greater is left between the end face of the plunger and the attraction face of the guide when the valve body comes in contact with the valve seat, over a range where a stroke of the valve body from the valve seat is zero up to a maximum value, a stroke-attraction force characteristic line, which rises in accordance with a rise of electromagnetic force quantity, has a gentler gradient than a stroke-resistance force characteristic line, an attraction force at maximum value of the stroke in the stroke-attraction force characteristic line at a minimum value of electromagnetic force is smaller than a resistance force minimum point of the stroke-resistance force characteristic line, and an attraction force at zero value of the stroke in the stroke-attraction force characteristic line at a maximum value of electromagnetic force is greater than a resistance force maximum point of the stroke-resistance force characteristic line.