Abstract: A hydraulic pressure control device includes: a hydraulic pressure unit, in which a solenoid valve for hydraulic pressure control is assembled with a hydraulic pressure block; and an electronic control unit, which includes a circuit board having a drive control circuit of the solenoid valve and stored inside a resin case, wherein a solenoid coil is fit onto the main body of the solenoid valve fixed to the hydraulic pressure block of hydraulic pressure unit, and wherein the solenoid coil is elastically pressed against and fixed to the hydraulic pressure block by a coil pressing arm integrally formed with the resin case.

Abstract: A solenoid control apparatus includes a resin housing having a solenoid mounting portion, a connector portion, and a circuit board mounting portion in which a circuit board is mounted. Terminals extending from the solenoid mounting portion and the connector portion are soldered to the electrical circuit on the circuit board. The circuit board has a reduced-rigidity portion in its area corresponding to a portion of the resin housing through which the connector portion is connected to the solenoid mounting portion. The reduced-rigidity portion is formed by reducing the amount of material forming the circuit board per unit area, and is more easily deformable than the remaining portion of the circuit board. When the connector portion is thermally deformed, the circuit board is also easily deformable about the reduced-rigidity portion. This reduces stress on the soldered portions.

Abstract: An annular seal member includes: an annular base part; and a seal edge, which is provided on both end faces of the annular base part to protrude in opposite directions, wherein the seal edge is configured to closely contact with a opposing face of a seal target such that an inner periphery side of the base part and an outer periphery side of the base part are fluid-tightly partitioned, wherein a plurality of the seal edges is provided in parallel with each other in at least one area of the base part, and wherein the number of the seal edges in the at least one area of the base part is larger than the number of the seal edges in the other area of the base part.

Abstract: A solenoid control apparatus includes a resin housing having a solenoid mounting portion, a connector portion, and a circuit board mounting portion in which a circuit board is mounted. Terminals extending from the solenoid mounting portion and the connector portion are soldered to the electrical circuit on the circuit board. The circuit board has a reduced-rigidity portion in its area corresponding to a portion of the resin housing through which the connector portion is connected to the solenoid mounting portion. The reduced-rigidity portion is formed by reducing the amount of material forming the circuit board per unit area, and is more easily deformable than the remaining portion of the circuit board. When the connector portion is thermally deformed, the circuit board is also easily deformable about the reduced-rigidity portion. This reduces stress on the soldered portions.

Abstract: In an electrically-driven piston pump including a fluid reservoir for retaining fluid that has leaked into a cam chamber, at an edge between a side wall surface of the cam chamber and the fluid reservoir, an upper edge, which is positioned on the upper side, is arranged so as to extend downward from the electric motor side toward the side away from the electric motor. With this arrangement, the fluid that has leaked into the cam chamber from a piston bore flows from the electric motor side toward the side away from the electric motor, coursing along the upper edge due to the gravity, and is thus introduced into the fluid reservoir.

Abstract: In an electrically-driven piston pump including a fluid reservoir for retaining fluid that has leaked into a cam chamber, at an edge between a side wall surface of the cam chamber and the fluid reservoir, an upper edge, which is positioned on the upper side, is arranged so as to extend downward from the electric motor side toward the side away from the electric motor. With this arrangement, the fluid that has leaked into the cam chamber from a piston bore flows from the electric motor side toward the side away from the electric motor, coursing along the upper edge due to the gravity, and is thus introduced into the fluid reservoir.

Abstract: A method of manufacturing a fine-particle colloid or a magnetic fluid of a metal nitride through reaction between a metal carbonyl and a nitride-bearing compound, a two-step reaction is performed, comprising a first-step reaction of synthesizing a nitrogen-bearing metal carbonyl which is a precursor substance and a second-step reaction of synthesizing metal nitride from said precursor substance. A step of eliminating unreacted metal carbonyl is provided between the two-step reaction. By repeatedly causing the series of reactions, a fine-particle colloid or a magnetic fluid of the metal nitride is manufactured. For the magnetic fluid, the solvent may be replaced in response to a particular purpose of use of application after production.

Abstract: A compound containing nitrogen is introduced into a solvent in which a metal carbonyl and a surface active agent are dissolved, and the solution is heated to generate a particle colloid or a magnetic fluid of a metal nitride. A particle colloid of a metal nitride with an even grain size, a good dispersibilitgy and a good fluidity, and a magnetic fluid thereof with an excellent properties are obtained with convenience and at high efficiency.

Abstract: An electrical contact material consisting essentially of silver and a small amount of zinc oxide, tellurium oxide, and optionally indium oxide and tin oxide, these oxides being uniformly dispersed in the silver matrix.