Abstract: When a rotor and a case are formed from different materials, deformation and early wear due to insufficient strength of an engagement hole of a lock means which locks the relative rotation of the rotor and the case can be prevented. Furthermore it is possible to maintain a clearance between the sliding faces of the rotor and the case in response to temperature variations. A second rotating body 6 is formed from a material with a smaller linear expansion coefficient than a first rotating body 2, and an engagement hole 121 is provided in the second rotating body 6 and which engages and disengages the lock mechanism.

Abstract: When a rotor and a case are formed from different materials, deformation and early wear due to insufficient strength of an engagement hole of a lock means which locks the relative rotation of the rotor and the case can be prevented. Furthermore it is possible to maintain a clearance between the sliding faces of the rotor and the case in response to temperature variations. A second rotating body 6 is formed form a material with a greater linear expansion coefficient than a first rotating body 2 and an engagement hole 21 which stores a lock means 20 in a second rotating body 6 and which engages and disengages a lock means 20 is provided in the first rotating means 2.

Abstract: When a rotor and a case are formed from different materials, deformation and early wear due to insufficient strength of an engagement hole of a lock means which locks the relative rotation of the rotor and the case can be prevented. Furthermore it is possible to maintain a clearance between the sliding faces of the rotor and the case in response to temperature variations. A second rotating body 6 is formed form a material with a greater linear expansion coefficient than a first rotating body 2, and an engagement hole 21 which stores a lock means 20 in a second rotating body 6 and which engages and disengages a lock means 20 is provided in the first rotating means 2. The second rotating body 6 and the locking means 20 are formed form a material with approximately the same linear expansion coefficient.

Abstract: A solenoid valve which includes a division wall disposed between an inlet and outlet ports and around the valve seat for defining a resonant chamber in the space. The division wall is provided with at least one communication hole which communicates between the fluid chamber and the resonant chamber through which hole air passes.