An electromagnetic valve (OV) has: a coil unit (14) including a bobbin (12) around which a coil winding (13) is wound, the bobbin (12) having a central hole (12a); a pipe body (16) in which a fixed core (17) is press-fitted and welded; and a valve operatin...

The control unit (16) keeps the energization duty factor to the electric motor (12) at 100% until a predetermined time elapses and thereafter executes control of the energization duty factor in accordance with the voltage of the battery (18).

A braking apparatus for a vehicle has: a hydraulic braking pressure control apparatus (4) disposed on a base (22), including: a control valve unit (VA-VD) for switching among a state where hydraulic passages to access a master cylinder (M) are communicated...

An electromagnetic valve has a cylindrical-shaped valve housing (22), a fixing core (23); a movable core (24); a first return spring (25); a coil (41); a first valve mechanism (29) including a movable seat member (44), a second return spring (45), a first ...

A normally closed electromagnetic valve has a cylindrical valve housing (22); a valve seat member (23); a fixed core (24); a movable core (26); a valve body (28); a return spring (29); and, a coil (30), one side of the valve housing being housed in a mount...

A hydraulic master cylinder (1) for a vehicle having a bar handle has a hydraulic master cylinder (2) including a cylinder bore (10) opening toward a front part of a vehicle body and a piston (11) inserted into the cylinder bore (10), the hydraulic chamber...

In a proportional booster valve V, a primary reaction piston 37 and a secondary reaction piston 38 are provided between a control piston 23 which faces at one end thereof toward a control pressure chamber 25 into which hydraulic pressure outputted from a p...