JPS6026551Y2 - Rotor housing unit for turntable drive motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor housing unit of a direct drive thin motor used for driving a turntable of a record player.

The conventional rotor housing unit of this type of motor is
As shown in FIG. 1, a cylindrical bearing B is fixed to the center hole of a circular rotor housing A by caulking, and a center spindle C is press-fitted and fixed to the upper end of the bearing B, and a resin seat The rotor magnet E of the motor and the speed control detection magnet F were attached to the back surface of the rotor housing A using a center positioning jig.

Therefore, the number of parts and the number of assembly steps increase, and the assembly accuracy is also low.

Further, since a center positioning jig is required, installation requires skill, and there is a drawback that it cannot be abbreviated or automatically assembled.

Therefore, the present invention is an attempt to solve the above-mentioned drawbacks.The present invention aims to solve the above-mentioned drawbacks.
By integrally molding the bearing, motor rotor magnet, speed control detection magnet fixing member, etc. on a concentric circle, the number of parts and assembly man-hours can be reduced, assembly accuracy is improved, and it is possible to simplify and automate assembly. To provide a rotor housing unit for a turntable driving motor that can be used in various applications.

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.
The figure is a perspective view of the rotor housing according to the present invention seen from the front side, FIG. 3 is a longitudinal sectional side view of the rotor housing, and FIG. 4 is a back view of the rotor housing. A circular hole 2 is formed in the center of the substrate 1, and a plurality of through holes 3 are formed at predetermined positions on the concentric circle.

The shape of the through hole 3 may be an arcuate hole having a predetermined length along the circumference, or a plurality of circular holes may be formed on an arcuate line of a predetermined length.

Further, between the circular hole 2 and the through hole 3, a plurality of through holes 4 and female screw portions 7 into which the set screws 6 of the turntable 5 are screwed are formed alternately on a concentric circle. There is.

A center guide portion 8 is provided on the circular substrate 1, and an arcuate guide portion 9 of a predetermined length along concentric circles is integrally molded (outsert molding) on the back surface of the circular substrate 1. ).

The center guide section 8 includes a disk 10 that is in close contact with the surface of the circular substrate 1 and has a larger diameter than the circular hole 2, a center spindle 11 that stands upright at the center of the disk 10, and a center guide section 8 that is arranged on a concentric circle of the disk 10. A stopper pin 12 that fits into the stopper holes 5a of the turntable 5 that are scattered about, a bearing fixing cylinder 14 that protrudes downward from the center of the back surface of the disk 10 through the circular hole 2 to fix the bearing 13, and a circular It is comprised of a disk guide portion 16 which is a perfect circle and has a larger diameter than the circular hole 2 for closely fixing the rotor magnet 15 of the motor to the back surface of the substrate 1.

The disk 10 molded on the front and back surfaces of the circular substrate 1 and the disk guide 16 are integrated through the circular hole 2 and the through hole 4.

Reference numeral 17 denotes an insertion hole for the stopper 6 formed in the disk 10, and the insertion hole 17 is formed at a position corresponding to the female threaded portion 7.

Note that the portion of the disc guide portion 16 that corresponds to the female screw portion 7 is a recess.

On the other hand, the arc-shaped guide part 9 for fixing the motor speed control detection magnet 18 passes through the through-hole 3 and is connected to the arc-shaped piece 19 of a predetermined length molded on its surface.
The arcuate piece 19 and the arcuate guide portion 9 are formed larger than the through hole 3, and the arcuate piece 7 and the disk 10 are connected by a runner 20 formed during molding.

In this case, the above-mentioned arcuate guide portion 9 and disk guide portion 16 are
Both outer circumferential surfaces 9a, 16a and inner circumferential surface 1 of the bearing fixed cylinder 14
4a is preferably formed into a knurl when molded, so that the speed control detection magnet 18,
The rotor magnet 15 and the bearing 13 can be securely press-fitted with moderate pressure.

Also, insert the stopper pin 1 into the stopper hole 5a of the turntable 5.
2 and place the turntable 5 on the disc 10,
By screwing the set screw 6 into the female threaded portion 7 of the circular board 1 and fixing it together, the stopper pin 12 solves the slipping problem of the turntable 5 during startup, which occurs when a motor with high torque and starts quickly. You can also
Only one piece of packaging is required at the time of shipment, and the record can be played immediately after being unpacked.

Note that the present invention can also be applied to a device in which the speed control detection magnet and the rotor magnet are integrally formed.

As described above, the present invention has a circular hole 2 in the center of a circular substrate 1,
A plurality of through holes 3, 3 are provided at predetermined positions on the concentric circles, and a center guide portion 8 spanning the front and back sides is integrally formed with synthetic resin at the center of the circular substrate 1 via the circular hole 2. , an arcuate guide portion 9 of a predetermined length is integrally molded from synthetic resin along concentric circles on the back surface of the circular substrate 1 through the through holes 3, 3, and the center guide portion is formed on the circular substrate 1. A disk with a diameter larger than the circular hole 2 on the surface, a center spindle standing upright at the center of the disk, stopper pins 12 that fit into the stopper holes of the turntable 5 dotted on the concentric circles of the disk, and the back surface of the disk. A bearing fixing cylinder 14 protrudes downward from the center through a circular hole and is fixed to the bearing, and a circular plate guide part 16 with a diameter larger than the circular hole 2 for fixing the rotor magnet 15 of the motor to the back surface of the circular board. On the other hand, the arcuate guide portion 9 is formed larger than the through hole, and has an arcuate piece 1 of a predetermined length similarly molded on the surface.
9. This is a rotanousing unit for a turntable driving motor, characterized in that it is formed integrally with 9.

As described above, a major feature of the present invention is that the center guide portion 8 and the arcuate guide portion 9 are integrally molded onto the circular substrate 1 using synthetic resin.

Therefore, the number of parts can be greatly reduced, so that costs and management can be reduced, and the number of assembly steps can also be significantly reduced.

Further, an arcuate guide portion 9, a center spindle 11. By being able to mold the bearing fixing cylinder 14, disc guide part 16, etc. concentrically and vertically, assembly accuracy is improved, and the assembly can be easily and accurately performed without the need for a special center positioning jig. Bearing 13, rotor magnet 15
Since the speed control detection magnet 18 can be fixed, it is possible to save labor and support automatic assembly.

Further, since the center spindle 11 is integrally molded, there is no fear that it will come out from the bearing as in the conventional example.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a longitudinal side view of a conventional rotor housing unit, Fig. 2 is a perspective view of the rotor housing unit according to the present invention as seen from the front side, and Fig. 3 is a longitudinal side view of the rotor housing unit according to the present invention. figure,
FIG. 4 shows a back view of the same. 1... Circular board, 2... Circular hole, 3...
...Through hole, 5...Turntable, 8...
... Center guide section, 9 ... Arc-shaped guide, 11 ... Center spindle, 13 ...
・Bearing, 14...Bearing fixed cylinder, 15...
Ta-ta magnet, 16...Disc guide part, 1
8... Speed control detection magnet, 9a, 16a
...Outer peripheral surface, 14a...Inner peripheral surface.

Claims (3)

[Scope of utility model registration request] (1) A circular hole is provided in the center of the circular substrate, and a plurality of through holes are provided at predetermined positions on the concentric circle, and a center guide portion that spans the front and back is synthesized in the center of the circular substrate through the circular holes. In addition, an arc-shaped guide portion of a predetermined length is integrally molded from synthetic resin along a concentric circle on the back surface of the circular substrate through the through hole, and the center guide portion is circular. A disk with a diameter larger than the circular hole on the surface of the board, a center spindle standing upright at the center of the disk, a stopper pin that fits into the stopper hole of the turntable dotted on the concentric circles of the disk, and a circular disk from the center of the back surface of the disk. It consists of a bearing fixing tube that protrudes downward through the hole and fixes it to the bearing, and a disk guide part with a diameter larger than the circular hole for fixing the rotor magnet of the motor to the back surface of the circular base plate. 1. A rotor housing unit for a turntable driving motor, characterized in that the arcuate guide portion is formed larger than the through hole and is integrally formed with a circular arc piece of a predetermined length similarly molded on the surface. (2) A utility model registered as claimed in claim 1, characterized in that both the outer circumferential surfaces of the disc guide portion and the arcuate guide portion and the inner circumferential surface of the bearing housing tube are knurled. Rotor housing unit for turntable drive motor. (3) A rotor housing unit for a turntable driving motor according to claim 1 or 2, characterized in that a turntable is integrally fixed on the center guide portion.