JP5221414B2 - Motor holding device - Google Patents

Description

  The present invention relates to an electronic device equipped with a motor, and more particularly, to a motor holding device that can stably hold a motor with a minimum number of components.

  An electronic device including a drive mechanism inside a housing, such as a vehicle-mounted disk device, includes at least one motor. It is necessary to fix this motor so that it does not move unnecessarily inside the housing, and furthermore, since the rotation axis of the motor has a shakiness in the axial direction, this shakiness should be regulated. Is also necessary. In particular, when a gear that generates thrust in the axial direction, such as a worm gear, is fixed to the rotating shaft, it is important to restrict the rotating shaft from moving in the axial direction during rotation.

  In the drive mechanism described in Patent Document 1 below, a worm gear is fixed to a rotating shaft of a motor, and this worm gear meshes with a side worm wheel. A leaf spring is supported by the chassis, and a gear contact portion that can be elastically deformed is formed integrally with a part of the leaf spring, and the tip of the worm gear is pressed toward the motor body by the gear contact portion. .

JP 2002-310241 A

  In the drive mechanism described in Patent Document 1, a mechanism for fixing the leaf spring to the chassis and a mechanism for fixing the motor to the chassis are provided separately. Work becomes necessary and assembly man-hours increase. In addition, the number of parts increases because the leaf spring and the motor are individually fixed to the chassis.

  In this type of motor drive mechanism, a female screw is formed at the front end portion of the motor main body, and a mounting screw inserted into a positioning portion formed in the chassis is screwed into the female screw, so that the main body of the motor Is generally fixed to the positioning portion.

  However, since the motor is cantilevered with its front end fixed to the positioning portion, the motor is likely to vibrate during rotation, and the vibration is transmitted to the chassis and large drive noise is likely to occur.

  In addition, when the mounting screw is screwed into the female screw, scraped metal powder tends to be generated from the periphery of the female screw of the motor main body, and this damaged powder enters the motor main body or between the gears. The problem of increasing the rotational load of the rotor and gears inside the motor is likely to occur.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a motor holding device that can stably position and hold a motor with a minimum number of parts and that can easily reduce drive noise. It is said.

The present invention relates to a motor in which a motor having a body portion having a front end portion and a rear end portion, a bearing portion projecting from the front end portion, and a rotating shaft projecting forward from the bearing portion is held by a bracket. In the holding device,
The bracket is formed with a main body installation portion on which the main body portion is installed, a front support portion with which the front end portion abuts, a rear support portion with which the rear end portion abuts, and a recess that holds the bearing portion. And
A fixing member formed of a leaf spring material is provided, and the fixing member includes an intermediate piece, and a base piece and a front piece that are bent on both sides of the intermediate piece and face each other;
The base piece is inserted between the front end portion of the main body portion and the front support portion of the bracket, and the base piece is positioned by pressing the bearing portion against the inner edge portion of the recess. The tip piece is in contact with the tip of the rotating shaft or the tip of a gear fixed to the rotating shaft, and the rotating shaft is biased toward the main body.

  The motor holding device of the present invention is a fixing member formed by bending with a leaf spring, and performs positioning of the bearing portion of the motor and prevention of rattling in the axial direction of the rotating shaft. Therefore, it is possible to stably hold the motor and restrict the rotating shaft with the minimum number of parts.

  In the present invention, it is preferable that a pressing portion facing the front support portion of the bracket is provided, and the intermediate piece of the fixing member is pressed toward the inner edge portion of the concave portion by the pressing portion.

  For example, the bracket is installed inside a housing, and the pressing portion is an inner surface of the housing. Moreover, it is preferable that an elastic piece is integrally formed on the intermediate piece of the fixed portion, and the elastic piece is pressed by the pressing portion.

  In this way, the other mechanical components located on the inner surface of the housing or the side of the bracket serve as a pressing portion, and the fixing member is pressed by the pressing portion, so that the motor can be held so as not to be detached from the bracket. Therefore, a mounting screw for fixing the motor to the bracket is also unnecessary.

  In the present invention, it is preferable that the rear support portion of the bracket is elastically deformable, and the main body portion is pressed and positioned by the front support portion by an elastic pressing force of the rear support portion.

  The motor can be firmly positioned and held by sandwiching and holding the motor body from the front and rear by the bracket. In addition, since the motor is stably held, generation of vibration during rotation can be suppressed, and driving noise can be reduced.

  In the present invention, the front support portion of the bracket is integrally formed with a positioning surface with which the front end portion of the main body abuts and a fixed surface that is recessed in a direction away from the front end portion with respect to the positioning surface. And the base piece of the fixing member is mounted so as to overlap the fixing surface.

  As described above, since the fixing surface with which the base piece of the fixing member abuts is formed to have a step with the positioning surface, the front end surface of the motor main body portion is a bracket regardless of the presence of the fixing member. The positioning surface is brought into contact with the positioning surface.

  The motor holding device of the present invention can position and hold the motor on the bracket with a minimum number of parts and without using mounting screws. In addition, since the holding of the motor body is stable, the motor is less likely to vibrate during rotation, and driving noise can be reduced.

The perspective view which shows the holding device of the motor of embodiment of this invention, 1 is an exploded perspective view of the motor holding device shown in FIG. The side view which shows the holding device of the motor of FIG. 1 from a III arrow direction, The bottom view which shows the holding | maintenance apparatus of the motor of FIG. 1 from IV arrow direction,

  The motor holding device according to the embodiment is provided inside a housing of a vehicle-mounted disk device. Various mechanisms such as a transport mechanism for transporting the disk to the inside of the housing and a clamp mechanism for clamping the disk to the rotation drive unit are driven by the motor M held by the motor holding device. The motor holding device of the present invention is not limited to the disk device, and can be implemented in other various electronic devices in which a drive mechanism is provided inside the housing.

  As shown in FIG. 2, the motor M has a main body 1. The main body 1 houses a rotor and a magnetic drive mechanism, and a metal case appears on the surface. The main body 1 has side surfaces 1a and 1b that face each other in parallel, an upper surface 1c in the shape of a partial cylindrical surface, and a lower surface 1d that is also in the shape of a partial cylindrical surface. The main body 1 of the motor M has a rotationally symmetric shape of 180 degrees with respect to the axis center of the rotating shaft 2.

  The main body 1 of the motor M has a front end 3 and a rear end 4. The front end portion 3 and the rear end portion 4 are planes facing each other in parallel. The front end 3 of the main body 1 is used as a positioning reference surface when positioning the motor M forward in the axial direction (Y1 direction).

  As shown in FIG. 4, a short cylindrical bearing portion 5 projects from the center of the front end portion 3 of the main body portion 1. As shown in FIG. 2, a short cylindrical bearing portion 6 that protrudes rearward is provided at the center of the rear end portion 4 of the main body portion 1. The rotating shaft 2 is rotatably supported by the front bearing portion 5 and the rear bearing portion 6 and protrudes further forward from the front bearing portion 5. A worm gear 7 is fixed to the rotary shaft 2 protruding from the bearing portion 5.

  As shown in FIG. 2, a pair of energizing terminals 8, 8 protrude from the rear end 4 of the main body 1. As shown in FIG. 1, the energization terminals 8 and 8 are inserted into the flexible wiring board 9 and soldered to the energization path pattern formed on the flexible wiring board 9. In addition, illustration of the flexible wiring board 9 is abbreviate | omitted except FIG.

  Reference numeral 11 denotes a mechanism base formed of a synthetic resin, and supports each drive mechanism of the disk device. As shown in FIG. 4, a shaft 12 is fixed to the lower surface 11 a of the mechanism base 11, and a transmission gear 13 is rotatably supported on the shaft 12. The transmission gear 13 is made of synthetic resin or light metal, and a worm wheel 13a and a spur gear 13b are integrally formed. When the motor M is attached to the mechanism base 11, the worm wheel 13 a meshes with the worm gear 7. Further, the spur gear 13b meshes with another transmission gear provided on the lower surface 11a of the mechanism base 11, and the rotational force of the rotating shaft 2 of the motor M is further transmitted from the worm gear 7 through the worm wheel 13a to the spur gear 13b. Then, it is transmitted to the other transmission gear.

  A bracket 20 that holds the motor M is integrally formed of a synthetic resin material on the mechanism base 11. The bracket 20 has a concave main body installation portion 21. The inner surface of the main body installation portion 21 includes a side surface installation portion 21a having a vertical plane, an upper surface installation portion 21b having a shape of a partial cylindrical inner surface, and a lower surface installation portion 21c having a shape of a partial cylindrical inner surface.

  A front contact portion 22 is integrally formed on the Y1 side of the main body installation portion 21, that is, the side facing the front of the motor M. The inner surface of the front contact portion 22 is a vertical plane, and this plane is a positioning surface 22a for positioning the main body 1 in the front-rear direction (Y1-Y2 direction). On the inner surface of the front abutting portion 22, a fixed surface 22b formed with a step forward (Y1 side) from the positioning surface 22a is formed. The fixed surface 22b is parallel to the positioning surface 22a.

  The front contact portion 22 is formed with a holding recess 23 that opens laterally (X2 direction). In the holding recess 23, the inner edge portion 23a on the back side (X1 side) is a cylindrical surface, and the X2 side is parallel portions 23b and 23b opened with a constant width dimension W1. The radius of the inner edge portion 23a is approximately W1 / 2. The width dimension W <b> 1 is formed to be approximately the same as or slightly larger than the diameter of the bearing portion 5 in front of the main body portion 1.

  As shown in FIG. 2, a rear contact portion 24 is integrally formed on the Y2 side of the main body installation portion 21. Separation grooves 26 and 26 that enter the X1 direction are formed above and below the rear abutting portion 24, and the rear abutting portion 24 has a rectangular shape extending in the X2 direction with a constant height dimension (Z direction). . And the back contact part 24 can be elastically deformed in the front-back direction (Y1-Y2) direction by the elastic function of the synthetic resin material.

  As shown in FIGS. 3 and 4, a pressing recess 25 is formed on the inner surface of the rear abutting portion 24. The pressing recess 25 is formed at a certain depth in the Y2 direction from the inner surface 24a facing the Y1 side of the rear contact portion 24, and does not penetrate in the Y1-Y2 direction. The inner width dimension W2 of the pressing recess 25 in the vertical direction (Z1-Z2 direction) is formed to be approximately the same as or slightly larger than the diameter of the bearing portion 6 behind the main body portion 1 of the motor M. As shown in FIG. 4, the inner edge 25 a on the X1 side of the pressing recess 25 is a cylindrical surface having a radius of W2 / 2, like the inner edge 23 a of the holding recess 23.

  A fixing member 30 is used to hold the motor M to the bracket 20 and fix it. The fixing member 30 is made of a leaf spring material such as a stainless steel plate, and the leaf spring material has a thin plate thickness of about 0.3 mm.

  The fixing member 30 includes an intermediate piece 31, a base piece 32, and a tip piece 33. The base piece 32 and the tip piece 33 are bent from the intermediate piece 31 so as to face each other.

  The width dimension of the base piece 32 in the Z1-Z2 direction is formed to be substantially the same as the opening width dimension W3 of the fixing surface 22b formed in the front support portion 22 in the Z1-Z2 direction. The base piece 32 is formed with a pressing edge portion 32a facing the X1 side. The pressing edge portion 32 a is an arc concave portion having a radius of curvature equal to or larger than the diameter of the bearing portion 5 in front of the main body portion 1.

  The tip piece 33 of the fixing member 30 has a width dimension in the Z1-Z2 direction shorter than the base piece 32, and the bending elastic modulus in the Y1-Y2 direction of the tip piece 33 is lower than that of the base piece 32. Yes.

  As shown in FIG. 2, the intermediate piece 31 of the fixing member 30 is integrally formed with an elastic piece 34 that cantilevered forward (Y1 direction) at the center in the Z1-Z2 direction. A projecting portion 34 a projecting sideways (X2 direction) is integrally formed at the tip portion of 34. When an external force is not applied to the elastic piece 34, the protruding portion 34a of the elastic piece 34 protrudes to the X2 side from the outer surface of the intermediate piece 31 facing the X2 side.

  Next, a method for positioning and fixing the motor M by incorporating the motor M into the bracket 20 will be described.

  The worm gear 7 is fixed to the rotating shaft 2, the flexible wiring board 9 is attached to the rear end 4, and the motor M is mounted in the bracket with the current-carrying terminals 8 and 8 soldered to the current-carrying pattern of the flexible wiring board 9. 20 incorporated.

  The bearing portion 5 protruding forward of the main body portion 1 of the motor M is inserted into the holding recess portion 23 of the front support portion 22 of the bracket 20 with almost no gap. In a state where the bearing 5 is abutted against the inner edge 23a of the holding recess 23, the position of the bearing 5 in the lateral direction (X1-X2 direction) and the vertical direction (Z1-Z2 direction) is determined. As shown in FIGS. 3 and 4, the bearing portion 6 protruding rearward of the main body portion 1 is mounted inside the pressing recess 25 of the rear contact portion 24 of the bracket 20. The bearing portion 6 is inserted in the pressing recess 25 in the vertical direction (Z1-Z2 direction) with almost no gap, and as shown in FIG. 4, the bearing portion 6 is abutted against the inner edge portion 25a of the pressing recess 25, The bearing portion 6 is positioned in the lateral direction (X1-X2 direction) and the vertical direction (Z1-Z2 direction).

  When the main body portion 1 of the motor M is installed inside the main body installation portion 21, the rear contact portion 24 is pushed by the rear bearing portion 6 and slightly deformed in the Y2 direction. Therefore, the front end of the main body 1 is supported by the elastic force of the rear abutting portion 24 in a state where the bearing portion 5 is inserted and positioned in the holding recess 23 and the bearing portion 6 is installed and positioned in the pressing recess 25. The portion 3 is pressed by the positioning surface 22a of the front abutting portion 22, and the position of the main body portion 1 in the front (Y1 direction) is determined. Note that. Since the front contact portion 22 is reinforced by the reinforcing rib 28 integral with the mechanism base 11, even if the main body portion 1 is pressed against the positioning surface 22a, the front contact portion 22 is not deformed.

  When the main body unit 1 is inserted into the main body installation unit 21, the side surface 1a of the main body unit 1 faces the side surface installation unit 21a, the upper surface 1c and the lower surface 1d of the main body unit 1 are the upper surface installation unit 21b and the lower surface installation unit 21c. Face to face. However, the motor M is positioned in the X1-X2 direction and the Z1-Z2 direction by the front bearing portion 5 being inserted into the holding recess 23 and the rear bearing portion 6 being installed in the pressing recess 25. Further, the front end portion 3 of the main body 1 is positioned in the Y1 direction by contacting the positioning surface 22a. In this positioning state, an appropriate meshing state is realized between the worm gear 7 fixed to the rotating shaft 2 and the worm wheel 13a shown in FIG.

  After the motor M is mounted on the bracket 20, the leaf spring fixing member 30 is offered. As shown in FIGS. 3 and 4, the base piece 32 of the fixing member 30 is inserted between the main body 1 of the motor M and the front contact portion 22, and the base piece 32 is formed in the front contact portion 22. It is installed on the fixed surface 22b. At this time, the tip piece 33 is brought into contact with the tip of the rotating shaft 2 of the motor M.

  The base piece 32 and the tip piece 33 are attached to the fixed surface 22b and the tip of the rotating shaft 2 with the opposing distance forcibly increased. Therefore, the base piece 32 receives and abuts the elastic force on the fixed surface 22b, and the rotary piece 2 is pressed and urged in the Y2 direction by the tip piece 33. The base piece 32 abuts on the fixed surface 22b with elasticity, and the base piece 32 is regulated vertically by the opening width dimension W3 in the vertical direction of the fixed surface 22b. It is held on the inner surface without moving easily. Then, the front bearing portion 5 is pressed against the inner edge portion 23 a of the holding recess 23 by the pressing edge portion 32 a formed on the edge portion of the base piece 32. Thereby, the bearing part 5 is positioned without moving easily in the X2 direction.

  The thickness of the base piece 32 of the fixing member 30 is sufficiently smaller than the depth of the step between the positioning surface 22a and the fixing surface 22b formed in the front contact portion 22. Therefore, the base piece 32 of the fixing member 30 is installed on the fixing surface 22 b without hitting the front end 3 of the main body 1 of the motor M. Therefore, even if the base piece 32 exists in front of the main body 1, the front end 3 of the main body 1 reliably contacts the positioning surface 22 a and positioning in the Y1 direction is performed.

  With the motor M and the fixing member 30 mounted on the mechanism base 11, the mechanism base 11 is housed inside the housing 40 as shown in FIG. 4. At this time, the protruding portion 34a of the elastic piece 34 formed on the intermediate piece 31 of the fixing member 30 is pressed by the inner surface of the housing 40 serving as the pressing portion 41 and facing the X2 side from the front contact portion 22. It is brought into pressure contact with the portion 41. The elastic piece 34 is pressed in the X1 direction by the pressing portion 41, and the entire fixing member 30 is pressed against the bracket 20 in the X1 direction.

  Therefore, the bearing portion 5 in front of the motor M is positioned and fixed without moving easily in the X2 direction inside the holding recess 23.

  Further, since the rotary shaft 2 is urged in the Y2 direction by the tip piece 33 of the fixing member 30, the rotary shaft 2 rotates, and the rotating shaft 2 is rotated by the meshing load between the worm wheel 13a and the worm gear 7. Even if the thrust in the direction is generated, the rotating shaft 2 becomes difficult to move in the axial direction. Therefore, it becomes easy to prevent damage to the bearing portions 5 and 6 of the motor M, and the service life of the motor M can be extended.

  The holding device for the motor M can position the motor M in the X, Y, and Z directions only by attaching the motor M and the fixing member 30 to the bracket 20, and can regulate the movement of the rotating shaft 2 in the axial direction. . Therefore, the motor M can be reliably positioned and held with the minimum number of parts, and the screwing operation for attaching the motor M is not necessary.

  Further, since the main body 1 of the motor M is firmly held between the front abutting portion 22 and the rear abutting portion 24 made of synthetic resin, the motor M is less likely to vibrate during rotational driving, and driving noise is reduced. Can also be reduced.

  The tip of the worm gear 7 may protrude in the Y1 direction from the tip of the rotating shaft 2, and the worm gear 7 may be pressed in the Y2 direction by the tip piece 33 of the fixing member 30.

M Motor 1 Main body part 3 Front end part 4 Rear end part 5 Front bearing part 6 Rear bearing part 7 Worm gear 11 Mechanism base 20 Bracket 21 Main body installation part 22 Front abutting part 22a Positioning surface 22b Fixing surface 23 Holding recess 23a Inner edge 24 rear contact portion 25 pressing recess 25a inner edge portion 30 fixing member 31 intermediate piece 32 base piece 33 front piece 34 elastic piece

Claims (6)

In a motor holding device in which a motor having a main body portion having a front end portion and a rear end portion, a bearing portion protruding from the front end portion, and a rotating shaft protruding forward from the bearing portion is held by a bracket,
The bracket is formed with a main body installation portion on which the main body portion is installed, a front support portion with which the front end portion abuts, a rear support portion with which the rear end portion abuts, and a recess that holds the bearing portion. And
A fixing member formed of a leaf spring material is provided, and the fixing member includes an intermediate piece, and a base piece and a front piece that are bent on both sides of the intermediate piece and face each other;
The base piece is inserted between the front end portion of the main body portion and the front support portion of the bracket, and the base piece is positioned by pressing the bearing portion against the inner edge portion of the recess. A motor holding device, wherein a tip piece abuts on a tip of the rotating shaft or a tip of a gear fixed to the rotating shaft, and the rotating shaft is biased toward the main body.   The motor holding device according to claim 1, wherein a pressing portion facing the front support portion of the bracket is provided, and the intermediate piece of the fixing member is pressed toward the inner edge portion of the concave portion by the pressing portion.   The motor holding device according to claim 2, wherein the bracket is installed inside a housing, and the pressing portion is an inner surface of the housing.   4. The motor holding device according to claim 2, wherein an elastic piece is formed integrally with the intermediate piece of the fixing portion, and the elastic piece is pressed by the pressing portion. 5.   The rear support part of the bracket is elastically deformable, and the main body part is pressed and positioned by the front support part by an elastic pressing force of the rear support part. The motor holding device as described.   The front support portion of the bracket is integrally formed with a positioning surface with which the front end portion of the main body abuts and a fixing surface that is recessed from the positioning surface in a direction away from the front end portion. The motor holding device according to any one of claims 1 to 5, wherein the base piece is mounted so as to overlap the fixed surface.

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