Abstract: A double eccentric valve: a valve seat; a rotary shaft; a valve gear with a rotary shaft base end portion; a motor rotating the shaft via a valve gear; bearings supporting the shaft in a cantilever manner; a return spring giving, to the valve gear, spring force for rotating the shaft in a valve body closing direction; and a full-close stopper to restrict valve gear rotation with the shaft when the valve body is fully closed. When the motor is not driven, the valve gear partially contacts the full-close stopper by spring force, moment acting on the valve gear is caused to act on the rotary shaft with the contact point serving as a fulcrum, the rotary shaft is tilted toward the valve seat with the contact point between the rotary shaft and the bearing serving as a fulcrum, and thus, the valve body is pressed against the valve seat.

Abstract: A double eccentric valve: a valve seat; a rotary shaft; a valve gear with a rotary shaft base end portion; a motor rotating the shaft via a valve gear; bearings supporting the shaft in a cantilever manner; a return spring giving, to the valve gear, spring force for rotating the shaft in a valve body closing direction; and a full-close stopper to restrict valve gear rotation with the shaft when the valve body is fully closed. When the motor is not driven, the valve gear partially contacts the full-close stopper by spring force, moment acting on the valve gear is caused to act on the rotary shaft with the contact point serving as a fulcrum, the rotary shaft is tilted toward the valve seat with the contact point between the rotary shaft and the bearing serving as a fulcrum, and thus, the valve body is pressed against the valve seat.

Abstract: Rotation angle detection apparatus includes a magnet provided in a main gear and a magnetism detector positioned to face to the magnet. Magnet rotates integrally with main gear and magnetism detector detects changes in magnetic field of magnet so a rotation angle of main gear is detected. Main gear includes bottomed recessed part and plurality of mounting pins arranged in recessed part. Magnet is inserted in recessed part wherein a part of magnet protrudes from an upper end of the recessed part. Magnet inserted in recessed part is pressed against main gear by an elastically deformable retaining plate made of non-magnetic material. An outer portion of retaining plate includes plurality of mounting holes. Magnet inserted in recessed part is pressed against main gear by elastically deformed retaining plate and mounting pins inserted in mounting holes are thermally caulked wherein magnet is secured to the main gear.

Abstract: Rotation angle detection apparatus includes a magnet provided in a main gear and a magnetism detector positioned to face to the magnet. Magnet rotates integrally with main gear and magnetism detector detects changes in magnetic field of magnet so a rotation angle of main gear is detected. Main gear includes bottomed recessed part and plurality of mounting pins arranged in recessed part. Magnet is inserted in recessed part wherein a part of magnet protrudes from an upper end of the recessed part. Magnet inserted in recessed part is pressed against main gear by an elastically deformable retaining plate made of non-magnetic material. An outer portion of retaining plate includes plurality of mounting holes. Magnet inserted in recessed part is pressed against main gear by elastically deformed retaining plate and mounting pins inserted in mounting holes are thermally caulked wherein magnet is secured to the main gear.

Abstract: An accelerator device includes an accelerator arm 12 provided with an accelerator pedal 11, a support case 13 internally holding and supporting an arm base part 12a through a support shaft 14, a return spring 16 and 17 for urging the arm 12 to rotate in a returning direction to return the pedal 11 to an initial position, and an accelerator sensor 15 for detecting a rotation amount of the arm 12 as an accelerator opening degree. A hysteresis producing mechanism includes friction pieces 20 and 21 attached to the arm base part 12a. A curved contact surface 20a of the friction piece 20 is held in contact with a contacted surface 19a of a friction part 19 of the support case 13. One end of the return spring 16 and 17 is hooked in one end of the friction piece 20 and 21, and the other end of the spring 16 and 17 is connected to the arm base part 12a in order to press the contact surface 20a and 21a of the friction piece 20 and 21 against the contacted surface 19a of the friction part 19.

Abstract: An accelerator device includes an accelerator arm 12 provided with an accelerator pedal 11, a support case 13 internally holding and supporting an arm base part 12a through a support shaft 14, a return spring 16 and 17 for urging the arm 12 to rotate in a returning direction to return the pedal 11 to an initial position, and an accelerator sensor 15 for detecting a rotation amount of the arm 12 as an accelerator opening degree. A hysteresis producing mechanism includes friction pieces 20 and 21 attached to the arm base part 12a. A curved contact surface 20a of the friction piece 20 is held in contact with a contacted surface 19a of a friction part 19 of the support case 13. One end of the return spring 16 and 17 is hooked in one end of the friction piece 20 and 21, and the other end of the spring 16 and 17 is connected to the arm base part 12a in order to press the contact surface 20a and 21a of the friction piece 20 and 21 against the contacted surface 19a of the friction part 19.