초록 ▼

A driving device includes a first rotating member, an armature member being movable and rotatable together with, a second rotating member being rotatable relative to the armature member, a magnetic force generating portion for generating a magnetic force for attracting the armature member toward the

A driving device includes a first rotating member, an armature member being movable and rotatable together with, a second rotating member being rotatable relative to the armature member, a magnetic force generating portion for generating a magnetic force for attracting the armature member toward the second rotating member in order to establish a connection between the armature member and the second rotating member so as to be integrally rotatable, a sensor magnet fixed to the second rotating member, a sensor provided for detecting a change of the magnetic field and a fixing member formed with a first claw portion engaged with the second rotating member and a second claw portion engaged with the sensor magnet while being press-fitted thereto in a radial direction thereof, wherein the sensor magnet is fixed to the second rotating member by means of the fixing member.

대표청구항 ▼

1. A driving device comprising: a first rotating member driven so as to rotate;an armature member being movable in an axial direction thereof together with the first rotating member and being rotatable integrally with the first rotating member;a second rotating member facing the armature member in t

1. A driving device comprising: a first rotating member driven so as to rotate;an armature member being movable in an axial direction thereof together with the first rotating member and being rotatable integrally with the first rotating member;a second rotating member facing the armature member in the axial direction thereof and being rotatable relative to the armature member;a magnetic force generating means for generating a magnetic force by being energized, the magnetic force being used for attracting the armature member toward the second rotating member in order to establish a connection between the armature member and the second rotating member so as to be integrally rotatable;a sensor magnet fixed to the second rotating member for generating a magnetic field that changes in a circumferential direction of the sensor magnet;a sensor provided so as to face the sensor magnet in order to detect a change of the magnetic field; anda fixing member formed with a first claw portion and a second claw portion, the first claw portion engaged with the second rotating member while being press-fitted thereto in a radial direction thereof and the second claw portion engaged with the sensor magnet while being press-fitted thereto in a radial direction thereof, wherein the sensor magnet is fixed to the second rotating member by means of the fixing member. 2. The driving device according to claim 1, wherein the sensor magnet is fixed to an outer circumferential surface of the second rotating member by means of the fixing member. 3. The driving device according to claim 1, wherein the magnetic force generating means is fixed to the second rotating member so as to be integrally rotatably, and the fixing member includes a first power feeding member at the magnetic force generating means so as to be fixed thereto, the first power feeding member arranged so as to slide on a second power feeding member at a housing in order to feed an electric power to the magnetic force generating means via the second power feeding member. 4. The driving device according to claim 1, wherein the sensor magnet is formed in an annular shape, and the fixing member includes a plurality of the second claw portions arranged equiangularly in a circumferential direction of the fixing member. 5. The driving device according to claim 1, wherein the fixing member includes a plurality of the first claw portions arranged equiangularly in the circumferential direction of the fixing member. 6. The driving device according to claim 1, wherein the first claw portions and the second claw portions are formed alternately to each other in the circumferential direction of the fixing member. 7. The driving device according to claim 1 further includes a plate spring, having a flexibility, provided between the first rotating member and the armature member for connecting the first rotating member to the armature member and for being deformed when the armature member is attracted toward the second rotating member by means of the magnetic force generating means, wherein the plate spring includes: an annular portion; a plurality of power transmitting pieces formed so as to extend in a radial direction of the plate spring from the annular portion and to be connected to the first rotating member, the power transmitting pieces being arranged in a circumferential direction of the plate spring; and a plurality of flexible pieces formed so as to extend in the radial direction of the plate spring from the annular portion and having a flexibility whose level is greater than that of the power transmitting piece and to be connected to the armature member, the flexible pieces being arranged in the circumferential direction of the plate spring, and wherein the power transmitting piece includes a rotationally engaging surface formed so as to extend in a thickness direction of the power transmitting piece, at which the power transmitting piece engages the first rotating member in a rotational direction thereof. 8. The driving device according to claim 1, wherein each of the power transmitting pieces and the flexible pieces are formed so as to extend from the annular portion outwardly in a radial direction of the plate spring. 9. The driving device according to claim 1, wherein the power transmitting piece includes a press-fit portion formed by bending so as to extend in the thickness direction of the plate spring, and the power transmitting piece is connected to the first rotating member in such a way that the press-fit portion is press-fitted into the press-fit receiving portion of the first rotating member. 10. The driving device according to claim 1, wherein the press-fit portion includes a press-fit rotationally engaging portion formed so as to extend in a radial direction of the plate spring, the press-fit rotationally engaging portion being engaged with an inner wall of the press-fit receiving portion of the worm wheel in a rotational direction thereof. 11. The driving device according to claim 1, wherein the press-fit portion includes: a bending portion formed by bending at an end portion of the power transmitting piece so as to have a surface that extends in a direction orthogonal to a radial direction of the plate spring; an arc portion formed so as to extend from the bending portion in a circumferential direction of the plate spring; and the press-fit rotationally engaging portion formed by bending at an end portion of the arc portion, and wherein the press-fit rotationally engaging portion is arranged so as to press-contact to the inner wall of the press-fit receiving portion in the circumferential direction of the plate spring when the press-fit portion is press-fitted into the press-fit receiving portion. 12. The driving device according to claim 1, wherein the flexible piece includes an output side rotationally engaging surface being engaged with the first rotating member in a rotational direction thereof and formed on a surface extending in a thickness direction of the plate spring. 13. The driving device according to claim 1, wherein the flexible piece is connected to the armature member at an end portion thereof and is formed with a through hole at an intermediate portion in a radial direction of the flexible piece so as to pass through in a thickness direction thereof. 14. The driving device according to claim 1, wherein the power transmitting pieces and the flexible pieces are formed equiangularly and alternately to each other in the circumferential direction of the plate spring. 15. The driving device according to claim 1, wherein the power transmitting piece and the flexible piece are formed so as to extend from the annular portion radially outwardly, and into a center through hole of the first rotating member, a bearing through which a rotation shaft being integrally rotatable with the second rotating member is inserted is fixed, and the bearing is formed integrally with a regulating portion by which a movement of the annular portion relative to the first rotating member in an axial direction thereof is regulated.