JPH0736586U - Bearing device for brushless motor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a bearing device that achieves high strength, reduces cost, and has a high degree of axial suspension. [Structure] When the bearing holder 30 is integrated with the stator base 20, the bearing holder 30 is molded of resin so that a part of the stator base 20 serves as a reinforcing means. As the reinforcing means, the bearing holder 30 is bridged inside the supporting portion 32 and / or the stator base 2
The protrusion 22 cut and raised from 0 was made to bite into the rising portion 31 of the bearing holder 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing device for a brushless motor used in a headphone stereo player or the like.

[0002]

[Prior art]

 As a conventional brushless motor bearing device, as shown in FIG. 4, a stator holder 1 made of electro-zinc plated steel plate is provided with a bearing holder mounting hole 2 at substantially the center thereof, and a brass bearing holder 3 is fitted therein. However, it is known that the bottom part 4 is integrated by caulking. In the figure, reference numeral 5 is a pulley, and a rotating yoke 7 in which a stator 6 arranged on a rising portion 1a on the outer periphery of the stator base 1 is sandwiched with a slight gap, and a rotating case 9 on which a magnet 8 is mounted are attached. It is press-fitted onto the shaft 10. The shaft 10 is pivotally supported by a backing plate 13 via bearings 11 and 12, and is held by a receiving plate 14. Thus, the rotary yoke type brushless motor is constructed.

[0003]

[Problems to be solved by the device]

 However, since the bearing holder 3 is formed by cutting free-cutting brass, the component cost is high, the number of parts such as the backing plate 12 and the receiving plate 13 is large, and the bearing holder 3 is fitted to the stator base. Since it uses the caulking method, it requires double caulking together with the backing plate 12, which increases the processing cost. It also has a problem that the axial sag is difficult to obtain, and the caulking strength cannot be increased. When it is mounted on a new device, there is a risk that the shaft may bend due to impact and the rotor portion (magnet 8 or rotating yoke 7) may come into contact with the stator 6.

As a measure against this cost, a structure in which a bearing holder is integrally molded with a resin on a stator base is conceivable. However, this invention has been devised in such a structure to obtain high strength, thereby reducing the cost and the shaft. The purpose of the present invention is to provide a bearing device with a high degree of droop.

[0005]

[Means for Solving the Problems]

 In this invention, such a bearing holder is integrally molded with resin so that a part of the stator base serves as a reinforcing means. Preferably, at least one of the reinforcing means bridges the support portion of the bearing holder inside. It may be entangled or (further) a protrusion that digs into the start-up of the bearing holder.

[0006]

[Action]

 The reinforcing means bridging the inside of the bearing part of the bearing holder reinforces the pivot bearing part by the shaft and withstands the impact on the output end of the shaft. The reinforcement means with the protrusions biting into the start-up part of the bearing holder can withstand the impact from the lateral direction of the bearing holder. Will be available.

[0007]

【Example】

 FIG. 1 is a cross-sectional view of a main part of a bearing device for a brushless motor according to the present invention. As shown in FIG. 2, three through holes 21 are provided in a substantially central portion of a stator base 20, and three holes 21 are provided between the holes 21. Stick out the individual protrusions 22. Reference numeral 30 is a bearing holder made of glass fiber strength polyamide resin, and the projection 22 is bitten into the inside of the holder rising part 31 through the through hole 21, and the rising part 31 is formed on the upper surface and the lower part is formed on the lower surface. The base 20 is outsert-molded so that the supporting portion 32 is exposed.

Therefore, by forming the stator base 20 as a parting surface of all types, a good axial descent is obtained, and a part of the stator base 20 is provided inside the support portion 32 that supports the shaft 10. Since it becomes a reinforcing means in the remaining axial direction so that it bridges, high strength can be obtained. Further, the protrusion 22 serves as a reinforcing means for the rising portion 31. In the figure, those similar to the conventional one in FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted.

In the above description, the structure in which the support portion 32 of the stator base is projected to the lower surface is shown as an example. However, when the support portion should not be projected to the lower surface, as shown in FIG. You should inflate it upwards. In this case, since the supporting portion 3 does not protrude from the lower surface of the stator base, the appearance of the attachment or the like is good.

Further, in the above-mentioned embodiment, although the contact plate is omitted and the pivot is directly supported, it is also possible to mount the wear-resistant contact plate made of, for example, a fluororesin plate to support the pivot.

[0011]

[Effect of device]

 In this invention, since the bearing device is composed of the resin holder that is outer-sert-molded so that a part of the stator base serves as the reinforcing means as described above, high strength can be obtained, and the number of parts and the cost of parts can be reduced and excellent. Axiality is obtained.

[0012]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of an embodiment of a bearing device for a brushless motor according to the present invention.

FIG. 2 is a perspective view of a main part of a stator base that constitutes the same device.

FIG. 3 is a cross-sectional view of the main parts of another embodiment of the coaxial receiver.

FIG. 4 is a sectional view of a main part of a conventional bearing device for a brushless motor.

[Explanation of symbols]

 20 stator base 21 through hole 22 protrusion 30 bearing holder 31 start-up part 32 support part

Claims (3)

[Scope of utility model registration request] 1. A bearing device for a brushless motor, wherein a bearing holder is integrated with a stator base, and the bearing holder is integrally molded with resin so that a part of the stator base serves as a reinforcing means. 2. The bearing device for a brushless motor according to claim 1, wherein at least one of the reinforcing means is configured to bridge the support portion of the bearing holder inside. 3. A bearing device for a brushless motor according to claim 1, wherein at least one of the reinforcing means is a protrusion that is engaged with the rising portion of the bearing holder.