JP2015010695A

JP2015010695A - Rolling bearing

Info

Publication number: JP2015010695A
Application number: JP2013138518A
Authority: JP
Inventors: 飯田　彰; Akira Iida; 彰飯田; 福田　竜也; Tatsuya Fukuda; 竜也福田
Original assignee: NSK Ltd
Current assignee: NSK Ltd
Priority date: 2013-07-02
Filing date: 2013-07-02
Publication date: 2015-01-19

Abstract

PROBLEM TO BE SOLVED: To improve quietness of an appliance motor, and to attain energy conservation.SOLUTION: A rolling bearing includes an outer ring 1, an inner ring 2, and a rolling body 3 rotatably disposed between the outer ring 1 and the inner ring 2; and supports a motor rotational shaft. In the rolling bearing, the inner diameter of the inner ring 2 is 0.8-3 mm, the pitch diameter of the rolling body 3 is 4.5 mm or more and less than 6 mm, and the thickness of the outer ring 1 is 3-7 times of the thickness of the inner ring 2. A motor for a sleep device employs the rolling bearing.

Description

本発明は、家電製品のモータ回転軸を支持するのに使用される転がり軸受に関する。 The present invention relates to a rolling bearing used to support a motor rotating shaft of a home appliance.

家電製品に用いるモータ、例えば、クリーナモータや冷却ファンモータ等は、高速回転が要求されるものがある。それらのモータ回転速度は、通常３０，０００ｍｉｎ^−１以上である。モータの高速回転に伴い、モータの回転軸を支持する軸受に低トルク、長寿命化が要求される。 Some motors used in home appliances, such as cleaner motors and cooling fan motors, require high-speed rotation. Their motor rotation speed is usually 30,000 min ⁻¹ or more. Along with the high speed rotation of the motor, low torque and long life are required for the bearing that supports the rotating shaft of the motor.

例えば、特許文献１には、現行軸受に比べて、玉のピッチ円径ＰＣＤと玉径を小さくすることで、発熱を低減し、軸受の長寿命を図る軸受が開示されている。特許文献１に開示された軸受は、小径のものに該当する。その他、ＮＳＫ型番：小径ＧＲ６０８の（内径８ｍｍ、外径２２ｍｍ）がこの大きさに該当する。 For example, Patent Document 1 discloses a bearing that reduces heat generation and extends the life of the bearing by reducing the pitch circle diameter PCD and the ball diameter of the balls as compared to the current bearing. The bearing disclosed in Patent Document 1 corresponds to a small-diameter bearing. In addition, NSK model number: small diameter GR608 (inner diameter 8 mm, outer diameter 22 mm) corresponds to this size.

特開２００３−１９４０７５号公報JP 2003-194075 A

しかしながら、上述の小径軸受と比べて内外径寸法がもっと小さいミニアチュア軸受やニードル軸受が使用される場合、モータ高速回転時に発生する振動は軸受に大きく影響する。従来のミニアチュア軸受は、外輪の剛性が不十分である為、外輪の弾性変形が起こりやすく、変形した外輪に振動が発生する。軸受の振動が発生すると、騒音レベルは高い傾向にある。従って、従来のミニアチュア軸受は、静音性が追求される家電製品、例えば、エアコンの冷却ファンモータ、睡眠補助装置のモータ等に取付けると、製品の騒音レベルも高くなってしまう。そこで、軸受の振動を抑制し、軸受の静音性を向上することに検討の余地があった。 However, when a miniature bearing or needle bearing having a smaller inner and outer diameter than that of the small-diameter bearing described above is used, vibration generated during high-speed rotation of the motor greatly affects the bearing. In the conventional miniature bearing, since the rigidity of the outer ring is insufficient, the outer ring is easily elastically deformed, and vibration is generated in the deformed outer ring. When bearing vibration occurs, the noise level tends to be high. Therefore, when a conventional miniature bearing is mounted on a household electrical appliance in which quietness is pursued, for example, a cooling fan motor of an air conditioner, a motor of a sleep assist device, or the like, the noise level of the product is also increased. Therefore, there has been room for study to suppress the vibration of the bearing and improve the quietness of the bearing.

上記の課題を解決する為に、本発明に係る第１の発明は、外輪と、内輪と、外輪と内輪の間に転動自在に配設される転動体とを備え、モータ回転軸を支持する転がり軸受であって、内輪の内径が０．８ｍｍ〜３ｍｍであり、転動体のピッチ円直径が４．５ｍｍ以上、６ｍｍ未満であり、且つ外輪の厚さは、内輪の厚さの３〜７倍であることを特徴とする転がり軸受を提供している。 In order to solve the above-described problems, a first invention according to the present invention includes an outer ring, an inner ring, and a rolling element that is rotatably disposed between the outer ring and the inner ring, and supports a motor rotating shaft. The inner diameter of the inner ring is 0.8 mm to 3 mm, the pitch circle diameter of the rolling element is 4.5 mm or more and less than 6 mm, and the thickness of the outer ring is 3 to 3 of the thickness of the inner ring. There is provided a rolling bearing characterized in that it is seven times as large.

本発明に係る第２の発明は、一対の請求項１に記載の転がり軸受を回転軸の両端部に支持する睡眠補助装置（ＣＰＡＰ）用モータを提供している。 According to a second aspect of the present invention, there is provided a motor for a sleep assisting device (CPAP) that supports the rolling bearing according to the first aspect of the present invention at both ends of a rotating shaft.

本発明の転がり軸受は、外輪の剛性が高い為、軸受回転の際に外輪の弾性変形が起こりにくく、振動の発生を抑制でき軸受の静音性能を向上することでき、また、外力による衝撃に対して強く、外輪の変形も起こしにくい。 Since the rolling bearing of the present invention has a high rigidity of the outer ring, elastic deformation of the outer ring hardly occurs during the rotation of the bearing, the generation of vibration can be suppressed, and the silent performance of the bearing can be improved. Strong and resistant to deformation of outer ring.

その他、本発明の転がり軸受は、転動体のピッチ円直径ＰＣＤを規定する事により、玉の大きさは従来品より小さくし、軸受の回転トルクを低減することができるとともに、軸受組立時に外輪を変形させずに組立てることができる。従来のミニアチュア軸受にとって組立時に必要なパッチン代（最後１個目の転動体を内外輪に入れる際に必要な外輪変形量）が不要となり、組立時のブッシュリング等も不要となり、設計と組立両方を簡素化することもできる。 In addition, the rolling bearing of the present invention can reduce the rotational torque of the bearing and reduce the outer ring during the assembly of the bearing by defining the pitch circle diameter PCD of the rolling element, thereby reducing the size of the ball. Can be assembled without deformation. For conventional miniature bearings, the patching cost required for assembly (the amount of deformation of the outer ring required when the last rolling element is inserted into the inner and outer rings) is not required, and the bushing ring is not required during assembly. Can also be simplified.

本発明の第１実施形態に係る玉軸受を示す断面図。Sectional drawing which shows the ball bearing which concerns on 1st Embodiment of this invention. 図１の玉軸受が睡眠装置用モータに取付ける一例である。It is an example which the ball bearing of FIG. 1 attaches to the motor for sleep devices. 本発明の第２実施形態に係るニードル軸受を示す断面図。Sectional drawing which shows the needle bearing which concerns on 2nd Embodiment of this invention.

＜第１の実施形態＞
本実施形態では、睡眠装置のモータに取付ける玉軸受を例として挙げ、図１、２を参照しながら説明する。玉軸受Ａ，Ａ’には、外輪１、内輪２の間に複数の玉３が保持器４により回転自在に配設される。また、軸受内部空間を塞ぐシールド板５が外輪１に取り付けられ、内輪２と接触しない状態となっている。本実施形態の一対の玉軸受Ａ，Ａ’はミニアチュア軸受であり、サイズが特に限定されないが、一例として、外輪外径Ｄ＝φ１３ｍｍ、内輪内径ｄ＝φ３ｍｍ、ピッチ円直径ＰＣＤ＝４．９ｍｍ、玉直径Ｄａ＝φ１．２ｍｍのものが挙げられる。外輪１は、内輪２の厚さの７倍である。 <First Embodiment>
In the present embodiment, a ball bearing attached to the motor of the sleep device will be described as an example, and will be described with reference to FIGS. In the ball bearings A and A ′, a plurality of balls 3 are rotatably disposed between the outer ring 1 and the inner ring 2 by a cage 4. A shield plate 5 that closes the bearing internal space is attached to the outer ring 1 and is not in contact with the inner ring 2. The pair of ball bearings A and A ′ of this embodiment are miniature bearings, and the size is not particularly limited. As an example, the outer ring outer diameter D = φ13 mm, the inner ring inner diameter d = φ3 mm, the pitch circle diameter PCD = 4.9 mm, Examples of the ball diameter Da = φ1.2 mm. The outer ring 1 is seven times the thickness of the inner ring 2.

図２には、睡眠装置用モータＭの一例を示すものであり、本実施形態の玉軸受Ａ，Ａ’は、シャフト６の両側に配置され、シャフト６の回転を支持する。睡眠装置用モータＭが回転する際に、高速回転及び急加減速の為、従来の玉軸受を睡眠装置用モータＭに採用される場合、特に軸受の振動が外輪を通じて伝播しやすい。これに対して、本実施形態の玉軸受Ａ,Ｂは、従来の玉軸受と同様な外輪外径Ｄ、内輪内径ｄであるが、ピッチ円直径ＰＣＤ＝４．９ｍｍで、外輪１は内輪２の厚さの７倍の設計となっているので、軸受の振動も小さく外輪の振動伝播がほとんど起きない。従って、外輪の振動による騒音が少なく、睡眠装置用モータＭの静音性が良く、使用者の睡眠を促進する機能を発揮できる。 FIG. 2 shows an example of the sleeper motor M. The ball bearings A and A ′ of the present embodiment are arranged on both sides of the shaft 6 and support the rotation of the shaft 6. When the sleeping device motor M rotates, when a conventional ball bearing is employed in the sleeping device motor M for high-speed rotation and rapid acceleration / deceleration, the vibration of the bearing is likely to propagate through the outer ring. On the other hand, the ball bearings A and B of the present embodiment have the same outer ring outer diameter D and inner ring inner diameter d as the conventional ball bearing, but the pitch circle diameter PCD = 4.9 mm, and the outer ring 1 is the inner ring 2. Since the design is 7 times the thickness of the bearing, the vibration of the bearing is small and the vibration propagation of the outer ring hardly occurs. Therefore, there is little noise due to vibration of the outer ring, the quietness of the sleeper motor M is good, and the function of promoting the sleep of the user can be exhibited.

＜第２の実施形態＞
本実施形態は、睡眠装置のモータに取付けるニードル軸受Ｂを例として挙げ、図３を参照しながら説明する。外輪１’と、内輪２’と、外内輪の間に回転自在に配設される針状ころ３’と、針状ころ３’を保持する保持器４’を備えるニードル軸受Ｂの例では、玉軸受同様に外輪外径Ｄ＝φ１３ｍｍ、内輪内径ｄ＝φ３ｍｍ、ピッチ円直径ＰＣＤ＝７．３ｍｍのものが挙げられる。外輪１’は、内輪２’の厚さの３．５倍である。 <Second Embodiment>
In the present embodiment, a needle bearing B attached to a motor of a sleep device will be described as an example, and will be described with reference to FIG. In the example of the needle bearing B including an outer ring 1 ′, an inner ring 2 ′, a needle roller 3 ′ rotatably disposed between the outer and inner rings, and a cage 4 ′ that holds the needle roller 3 ′, As with ball bearings, the outer ring outer diameter D = φ13 mm, inner ring inner diameter d = φ3 mm, and pitch circle diameter PCD = 7.3 mm. The outer ring 1 'is 3.5 times the thickness of the inner ring 2'.

図２には、睡眠装置用モータＭの一例を示すものであり、本実施形態の一対の玉軸受Ｃは、シャフト６の両側に配置され、シャフト６の回転を支持する。針状ころ３’を採用する本実施形態の玉軸受Ｂの回転トルクは、玉を採用する場合と比べて若干上昇するが、針状ころ３’は、内外輪と面接触となっているので、転動体の直径をより小さくすることができ、それに伴い外輪の厚さをより厚く設計することが可能となる。本実施形態の玉軸受Ｂは、外輪の振動による騒音が少なく、睡眠装置用モータＭの静音性が良く、使用者の睡眠を促進する機能を発揮できる。 FIG. 2 shows an example of the sleeper motor M, and the pair of ball bearings C according to the present embodiment are disposed on both sides of the shaft 6 and support the rotation of the shaft 6. The rotational torque of the ball bearing B of the present embodiment employing the needle roller 3 ′ is slightly increased as compared with the case of employing the ball, but the needle roller 3 ′ is in surface contact with the inner and outer rings. Thus, the diameter of the rolling element can be made smaller, and accordingly, the thickness of the outer ring can be designed to be thicker. The ball bearing B of the present embodiment has little noise due to vibration of the outer ring, the quietness of the sleeper motor M is good, and can exhibit the function of promoting the sleep of the user.

Ｍ睡眠装置用モータ
Ａ、Ａ’ 玉軸受
Ｂニードル軸受 M Sleeper motor A, A 'Ball bearing B Needle bearing

Claims

A rolling bearing that includes an outer ring, an inner ring, and a rolling element that is rotatably disposed between the outer ring and the inner ring, and that supports a motor rotating shaft, wherein the inner ring has an inner diameter of 0.8 mm to 3 mm. The rolling bearing is characterized in that a pitch circle diameter of the rolling elements is 4.5 mm or more and less than 6 mm, and a thickness of the outer ring is 3 to 7 times a thickness of the inner ring.

A sleeper motor that supports the rolling bearing according to claim 1 at both ends of a rotating shaft.