JP2006042491A - Brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor for turning a disk, such as CD, DVD, or minidisc, wherein a coming-off preventing member used therein can be easily disassembled after assembly and be easily fixed. <P>SOLUTION: The coming-off preventing member 10 is provided outside a cover 17. This facilitates disassembly. Since the coming-off preventing member 10 is fixed by a seal-like adhesive member 13a or adhesive 13b, material cost and time for assembly can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotor retaining structure for a brushless motor that rotates a disk such as a CD, DVD, or mini disk.

  Conventionally, a brushless motor has been provided with a retaining structure in order to prevent the rotor from falling off when a load exceeding the magnetic attractive force between the rotor magnet and the stator core is applied to the motor. As a retaining structure, a structure in which a groove is provided in a part of the rotating shaft and a retaining member is engaged with the groove is generally employed (see, for example, Patent Document 1).

  Further, a structure in which an engaging portion is provided in the housing, a retaining member is provided in the rotor portion facing the housing, and these are engaged is also employed.

FIG. 4 shows the structure of a conventional brushless motor. In FIG. 4, 41 is a rotating shaft, 45 is a retaining member, 42 is a bearing, 43 is an engaging portion, and 44 is an introducing portion. The retaining member 45 has elasticity. When assembling the brushless motor, when the rotating shaft 41 is inserted into the bearing 42, the tip of the retaining member 45 comes into contact with the introduction portion 44, and when the rotating shaft 41 is further inserted, due to the elasticity of the retaining member 45. Since it spreads in the outer diameter direction of the introduction part 44 and further inserts the rotation shaft 41 and the tip of the retaining member 45 passes through the outer diameter of the introduction part 44, it becomes smaller than the outer shape of the introduction part 44 due to elasticity. Accordingly, the tip of the retaining member 45 enters the engaging portion 43 and functions as a retaining member.
Japanese Patent No. 3003763 (page 7, Fig. 1)

  However, the conventional configuration has a problem that it is difficult to disassemble and repair after assembly because the retaining member is difficult to operate from the outside of the brushless motor. Further, there is a problem that it is difficult to fix the retaining member to a narrow portion of the brushless motor.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a brushless motor that can be easily disassembled after assembling and that can easily fix a retaining member.

  In order to solve the above problems, the present invention is configured to fix the retaining member to the outside of the cover.

  According to the first aspect of the invention, the advantageous effect that the motor can be easily disassembled can be obtained.

  Further, according to the invention described in claim 2, it is possible to obtain an effect that it is easy to fix the stopper.

According to a first aspect of the present invention, there is provided a rotor including a rotating shaft, a rotating body fixed to the rotating shaft, a rotor magnet fixed to the rotating body, a mounting plate, and the rotating A bearing that rotatably holds the shaft, a housing that holds the bearing, a stator core wound with a copper wire disposed to face the rotor magnet, and a slide that slidably supports one end of the rotating shaft. In a brushless motor formed by combining a stator that fixes a moving member and a cover that holds the sliding member, the retaining member is attached from the outside of the cover, and can be easily disassembled after assembly. Have

  According to the second aspect of the present invention, the retaining member is fixed to the cover with a seal-like adhesive member or an adhesive, and has an effect that the retaining member is easily fixed.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
In FIG. 1, reference numeral 2 denotes a rotor frame, which has a rotating shaft 3 fixed at the center and a rotor magnet 4 attached to the inner peripheral side. The rotor rotation shaft 3 is rotatably supported by a bearing 7 held in a housing 8. A stator core 5 around which a copper wire 6 is wound is disposed inside the rotor magnet 4 so as to face each other. The stator core 5 is attached to the outer periphery on the open side of the bottomed cup-shaped cover 17, and the cover 17 is fixed to a burring portion formed at the center of the motor mounting plate 16 by press fitting or the like. A housing 8 is fixed to the inner peripheral side of the cover 17 by press fitting or the like. A sliding member 12 is disposed on the bottom of the cover 17 to support the end 15 on the opposite side of the rotary shaft 3 in the axial direction. Reference numeral 10 denotes a retaining member, which is formed by bending an elastic body into a substantially U-shape and bending the front end of the elastic body so that the locking claw portions 14 face each other. The locking claw portion 14 of the retaining member 10 is inserted from the outside of the cover 17 through the two holes 9 formed in the bottom portion of the cover 17 and is brought into close contact with the outer surface of the bottom portion of the cover 17 to provide a seal-like adhesive. It is fixed by the member 13a. On the other hand, a groove-like engaging portion 11 is formed in the vicinity of the end portion 15 on the counter-output side of the rotating shaft 3. When assembling the brushless motor 1 configured as described above, when the rotary shaft 3 is inserted into the bearing 7, the end portion 15 comes into contact with the locking claw portion 14 of the retaining member 10. Since the retaining member 10 is made of an elastic body, the end portion 15 of the rotating shaft 3 pushes the engaging claw portion 14 in the lateral direction so as to pass through, and when further inserted, the engaging claw portion 14 is rotated by the elastic restoring force. 3 and enters the inside of the engaging portion 11, and the tip of the end portion 15 comes into contact with the sliding member 12 disposed at the bottom of the cover 17 to complete the assembly. The bending angle of the locking claw portion 14 is preferably set to a slightly acute angle rather than a right angle so that the end portion 15 can be easily inserted. When the rotating shaft 3 is about to move in the output direction, it is possible to prevent the locking shaft 14 of the retaining member 10 from coming into contact with the engaging portion 11 of the rotating shaft 3 and coming out of the rotating shaft 3. Then, the motor can be easily disassembled by removing the seal-like adhesive member 13 a and removing the retaining member 10 from the cover 17.

(Embodiment 2)
FIG. 2 is a sectional view showing a brushless motor according to the second embodiment. The first embodiment is that the adhesive 13 b is used as a means for fixing the retaining member 10 to the cover 17.
According to this embodiment, a larger fixing strength of the retaining member 10 can be obtained.

  A load is not applied in the direction in which the retaining member 10 is removed except when the brushless motor is assembled. Therefore, at the time of assembly, as shown in FIG. 3, a load in the direction 18 in which the retaining member 10 is removed may be received by a jig or the like. Therefore, since the fixing method of the retaining member 10 may be as simple as the seal-like adhesive member 13a or the adhesive 13b, the material cost and assembly time of the brushless motor can be reduced, and the assembly equipment can be simplified. Note that the method of fixing the retaining member 10 to the cover 17 is not limited to the above embodiment, and various means such as spot welding and press-fitting by elasticity are also possible.

  The material of the retaining member 10 can be implemented without particular limitation as long as it has elasticity, such as resin or metal.

  The brushless motor of the present invention is useful as a brushless motor that rotates a disk such as a CD, a DVD, or a mini disk.

  However, the present invention is not limited to this, and the brushless motor of the present invention can be applied to an information recording / reproducing apparatus using other media and various power motors.

Sectional drawing which shows the brushless motor by Example 1 of this invention Sectional drawing which shows the brushless motor by Example 2 of this invention Sectional drawing which shows the state at the time of the assembly of the brushless motor of this invention Cross-sectional view of a conventional brushless motor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brushless motor 2 Rotor frame 3, 41 Rotating shaft 4 Rotor magnet 5 Stator core 6 Copper wire 7, 42 Bearing 8 Housing 9 Hole 10, 45 Retaining member 11, 43 Engaging part 12 Sliding member 13a Seal-like adhesive member 13b Adhesive 14 Locking claw portion 15 End portion 16 Mounting plate 17 Cover 18 Direction in which the retaining member 10 is pulled out 44 Introduction portion

Claims (2)

A rotor including a rotating shaft, a rotating body fixed to the rotating shaft, a rotor magnet fixed to the rotating body, a mounting plate, a bearing that rotatably holds the rotating shaft, and the bearing , A stator core wound with a copper wire disposed to face the rotor magnet, a sliding member that slidably supports one end of the rotating shaft, and a cover that holds the sliding member And a stator with a retaining member fixed thereto, wherein the retaining member is attached from the outside of the cover. The brushless motor, wherein the retaining member is fixed to the cover with a seal-like adhesive member or adhesive.