JP2019140851A

JP2019140851A - Brake

Info

Publication number: JP2019140851A
Application number: JP2018024453A
Authority: JP
Inventors: 田中　淳; Atsushi Tanaka; 淳田中; 松田　宏; Hiroshi Matsuda; 宏松田; 太久磨守屋; Takuma Moriya
Original assignee: Lixil Corp; Tok Inc
Current assignee: Lixil Corp; Tok Inc
Priority date: 2018-02-14
Filing date: 2018-02-14
Publication date: 2019-08-22
Anticipated expiration: 2038-02-14
Also published as: JP7022613B2

Abstract

To provide a brake capable of reducing the brake force imparted during low speed rotation, while obtaining sufficient brake force during high speed rotation of a body of rotation.SOLUTION: A brake 10 includes a housing 12, a first body of rotation 14 received rotatably in the housing 12, a second body of rotation 15 received rotatably in the housing 12 so as to be carried around the first body of rotation 14, a first conductive member 16a and a first magnet 18 placed oppositely to the rotational axis direction of the first and second bodies of rotation 14, 15, a second conductive member 16b and a second magnet 19 generating large resistance force against rotation of the second body of rotation 15 as the revolution of the second body of rotation 15 increases, and a movement mechanism for moving the second body of rotation 15 so that the interval of the first conductive member 16a and the first magnet 18 in the opposite direction decreases as the resistance force against rotation of the second body of rotation 15 increases.SELECTED DRAWING: Figure 2

Description

本発明は、制動装置に関する。 The present invention relates to a braking device.

従来より、導電性部材に生じる渦電流を利用して相対回転する固定体及び回転体に制動力を付与可能な制動装置が知られている。この種の制動装置では、通常、導電性部材に渦電流を生じさせるため、回転体の回転に連動して周方向での相対位置が変化するように導電性部材及び永久磁石が設けられる（たとえば、特許文献１参照）。 2. Description of the Related Art Conventionally, a stationary body that relatively rotates using an eddy current generated in a conductive member and a braking device that can apply a braking force to the rotating body are known. In this type of braking device, normally, in order to generate eddy current in the conductive member, the conductive member and the permanent magnet are provided so that the relative position in the circumferential direction changes in conjunction with the rotation of the rotating body (for example, , See Patent Document 1).

特開２００１−２０５９７号公報JP 2001-20597 A

本発明者は、特許文献１の制動装置に関して検討したところ、次の課題があるとの認識を得た。特許文献１の制動装置では、導電性部材と永久磁石が回転軸方向に対向して配置され、その回転軸方向での間隔が回転体の回転速度によらず一定である。この構造のもとでは、後述のように、制動装置の制動力は、回転体の回転速度の増大に伴い一次関数的に増加する。このような制動力が付与される場合、回転体の高速回転時に十分な制動力を得ようとすると、その低速回転時にも比較的に大きい制動力が付与されてしまう。これに伴い、制動装置による制動対象物を低速で動かすときに操作性の低下を招いてしまう。 When this inventor examined the brake device of patent document 1, it acquired recognition that there existed the following subject. In the braking device of Patent Document 1, the conductive member and the permanent magnet are arranged to face each other in the rotation axis direction, and the interval in the rotation axis direction is constant regardless of the rotation speed of the rotating body. Under this structure, as will be described later, the braking force of the braking device increases linearly as the rotational speed of the rotating body increases. When such a braking force is applied, if a sufficient braking force is to be obtained during high-speed rotation of the rotating body, a relatively large braking force is applied even during the low-speed rotation. In connection with this, when moving the braking target object by a braking device at low speed, the operativity will fall.

本発明のある態様は、このような課題に鑑みてなされ、その目的は、回転体の高速回転時には十分な制動力を得つつ、その低速回転時に付与される制動力を小さくできる制動装置を提供することにある。 An aspect of the present invention has been made in view of such problems, and an object thereof is to provide a braking device that can obtain a sufficient braking force when the rotating body rotates at a high speed while reducing a braking force applied during the low-speed rotation. There is to do.

上記課題を解決するための本発明の第１態様は、ハウジングと、ハウジング内に回転可能に収容される第１回転体と、ハウジング内に、第１回転体と連れ回り可能に収容される第２回転体と、第１回転体及び第２回転体の回転軸方向に対向して配置される導電性部材及び磁石であって、導電性部材及び磁石の一方は第２回転体と一体的に回転可能に設けられ、それらの他方はハウジングに設けられる導電性部材及び磁石と、第２回転体の回転速度が大きくなるほど、第２回転体の回転に対して大きな抵抗力を発生する回転抵抗手段と、第２回転体の回転に対する抵抗力が大きくなるほど、導電性部材と磁石の対向方向での間隔が小さくなるように、第２回転体を移動させる移動機構とを備える制動装置である。 A first aspect of the present invention for solving the above problems includes a housing, a first rotating body that is rotatably accommodated in the housing, and a first rotating body that is rotatably accommodated in the housing with the first rotating body. A two-rotor, and a conductive member and a magnet disposed opposite to each other in the rotation axis direction of the first and second rotors, wherein one of the conductive member and the magnet is integrated with the second rotor. The other of them, the other of which is a conductive member and a magnet provided in the housing, and the rotation resistance means that generates a greater resistance force against the rotation of the second rotating body as the rotation speed of the second rotating body increases. And a moving mechanism that moves the second rotating body so that the distance between the conductive member and the magnet in the facing direction decreases as the resistance force against the rotation of the second rotating body increases.

本発明によれば、回転体の高速回転時には十分な制動力を得つつ、その低速回転時に付与される制動力を小さくできる制動装置を提供できる。 ADVANTAGE OF THE INVENTION According to this invention, the braking device which can make small the braking force provided at the time of the low-speed rotation can be provided, obtaining sufficient braking force at the time of high-speed rotation of a rotary body.

回転体の回転速度と制動力の関係を示すグラフである。It is a graph which shows the relationship between the rotational speed of a rotary body, and braking force. 第１実施形態に係る制動装置を模式的に示す断面図である。It is sectional drawing which shows typically the braking device which concerns on 1st Embodiment. 第１回転体及び第２回転体の斜視図である。It is a perspective view of a 1st rotary body and a 2nd rotary body. 第１実施形態に係る制動装置の動作状態を模式的に示す断面図である。It is sectional drawing which shows typically the operation state of the braking device which concerns on 1st Embodiment. 第２実施形態に係る制動装置を模式的に示す断面図である。It is sectional drawing which shows typically the braking device which concerns on 2nd Embodiment. 第２実施形態に係る制動装置の動作状態を模式的に示す断面図である。It is sectional drawing which shows typically the operation state of the braking device which concerns on 2nd Embodiment.

まず、実施形態の制動装置の概要から説明する。実施形態の制動装置は、回転体の回転速度が大きくなるほど、導電性部材と磁石の対向方向での間隔が小さくなるように構成されている。ここでの「対向方向」とは、回転体の回転軸方向で導電性部材及び磁石が対向して設けられる方向をいう。 First, the outline of the braking device of the embodiment will be described. The braking device according to the embodiment is configured such that the spacing between the conductive member and the magnet in the facing direction decreases as the rotational speed of the rotating body increases. Here, the “opposing direction” refers to a direction in which the conductive member and the magnet are provided facing each other in the rotation axis direction of the rotating body.

図１は、回転体の回転速度と制動力の関係を示すグラフである。本グラフでは、特許文献１に記載の制動装置により得られる制動力Ｆｘと、実施形態の制動装置により得られる制動力Ｆｙの一例を示す。特許文献１の制動装置では、回転体の回転速度の増大に伴い一次関数的に制動力が増加する。一方、実施形態の制動装置では、回転体の回転速度の増大に伴い加速度的に制動力が増加する。これらの理由を説明する。 FIG. 1 is a graph showing the relationship between the rotational speed of the rotating body and the braking force. This graph shows an example of the braking force Fx obtained by the braking device described in Patent Document 1 and the braking force Fy obtained by the braking device of the embodiment. In the braking device disclosed in Patent Document 1, the braking force increases in a linear function as the rotational speed of the rotating body increases. On the other hand, in the braking device of the embodiment, the braking force increases in an accelerated manner as the rotational speed of the rotating body increases. These reasons will be described.

ここでは、説明を簡単にするため、導電性部材と磁石が回転軸方向に対向して配置され、回転体と一体的に磁石が回転することで、導電性部材と磁石の周方向での相対位置が変化する場合を例に説明する。これは、後述する図２の例を想定している。 Here, in order to simplify the explanation, the conductive member and the magnet are arranged to face each other in the rotation axis direction, and the magnet rotates integrally with the rotating body, so that the conductive member and the magnet are relatively aligned in the circumferential direction. A case where the position changes will be described as an example. This assumes the example of FIG.

導電性部材に対して磁石が相対回転したとき、磁石が作る磁場の影響を受けて、電磁誘導により導電性部材に渦電流が生じ、その渦電流により導電性部材に磁極が生じる。この渦電流により生じる導電性部材の磁極と磁石の磁極の間には、磁荷に関するクーロンの法則に基づき、下記の式（１）で表されるクーロン力Ｆ１［Ｎ］が磁気力として作用する。このクーロン力Ｆ１は、回転体の回転方向とは反対方向に向かう制動力として磁石に作用する。なお、ｋ１は係数、ｍ１は導電性部材に生じる磁極の磁荷［Ｗｂ］、ｍ２は磁石の磁荷［Ｗｂ］、ｒは導電性部材と磁石の間の対向方向（回転軸方向）での間隔［ｍ］である。
Ｆ１＝（ｋ１×ｍ１×ｍ２）／ｒ^２・・・（１） When the magnet rotates relative to the conductive member, an eddy current is generated in the conductive member by electromagnetic induction under the influence of a magnetic field generated by the magnet, and a magnetic pole is generated in the conductive member due to the eddy current. A Coulomb force F1 [N] expressed by the following equation (1) acts as a magnetic force between the magnetic pole of the conductive member generated by the eddy current and the magnetic pole of the magnet based on Coulomb's law related to the magnetic charge. . This Coulomb force F1 acts on the magnet as a braking force directed in the direction opposite to the rotation direction of the rotating body. Here, k1 is a coefficient, m1 is the magnetic charge [Wb] of the magnetic pole generated in the conductive member, m2 is the magnetic charge [Wb] of the magnet, and r is the facing direction (rotational axis direction) between the conductive member and the magnet. The interval [m].
F1 = (k1 × m1 × m2) / r ² (1)

また、導電性部材に生じる渦電流には、電磁誘導によって、次の式（２）で表されるローレンツ力Ｆ２［Ｎ］が作用する。このローレンツ力Ｆ２は、回転体の回転方向とは反対方向に向かう制動力として磁石に付与される。なお、ｑは渦電流の電荷量［Ｃ］、ｖは導電性部材の運動速度［ｍ／ｓ］、Ｂは磁石が作る磁場の対向方向での磁束密度［Ｗｂ／ｍ２］である。
Ｆ２＝ｑ×ｖ×Ｂ・・・（２） In addition, Lorentz force F2 [N] expressed by the following equation (2) acts on eddy current generated in the conductive member by electromagnetic induction. The Lorentz force F2 is applied to the magnet as a braking force directed in the direction opposite to the rotation direction of the rotating body. Note that q is the charge amount [C] of eddy current, v is the motion speed [m / s] of the conductive member, and B is the magnetic flux density [Wb / m2] in the opposite direction of the magnetic field generated by the magnet.
F2 = q × v × B (2)

導電性部材に対して磁石が回転したとき、磁石には前述のクーロン力Ｆ１とローレンツ力Ｆ２の合力Ｆａが作用する。一方、導電性部材には、作用反作用の法則により、この合力Ｆａとは逆向きに大きさの等しい力Ｆｂ（以下、反作用力Ｆｂという）が作用する。かりに、磁石ではなく導電性部材が回転したときも同様である。この合力Ｆａ又は反作用力Ｆｂの何れかは、導電性部材及び磁石の何れかと一体的に回転する回転体に制動力として作用する。 When the magnet rotates relative to the conductive member, the resultant force Fa of the aforementioned Coulomb force F1 and Lorentz force F2 acts on the magnet. On the other hand, due to the law of action and reaction, a force Fb (hereinafter referred to as a reaction force Fb) having the same magnitude as that of the resultant force Fa acts on the conductive member. The same applies when the conductive member is rotated instead of the magnet. Either the resultant force Fa or the reaction force Fb acts as a braking force on a rotating body that rotates integrally with either the conductive member or the magnet.

ここで、磁荷に関するクーロンの法則から、磁石が作る磁場の磁束密度Ｂは、前述の間隔ｒの二乗に反比例した関係にあることが知られている。このことと、式（２）から、次の式（３）が導き出せる。式（３）のｋ３は係数である。式（１）と式（３）に示すように、クーロン力Ｆ１とローレンツ力Ｆ２の何れも、導電性部材と磁石の間の対向方向での間隔ｒの二乗に反比例した関係にある。
Ｆ２＝（ｋ３×ｖ）／ｒ^２・・・（３） Here, it is known from the Coulomb's law regarding the magnetic charge that the magnetic flux density B of the magnetic field generated by the magnet is in a relationship inversely proportional to the square of the interval r described above. From this and equation (2), the following equation (3) can be derived. In equation (3), k3 is a coefficient. As shown in the equations (1) and (3), both the Coulomb force F1 and the Lorentz force F2 are in inverse proportion to the square of the distance r in the facing direction between the conductive member and the magnet.
F2 = (k3 × v) / r ² (3)

ここで、特許文献１の制動装置では、導電性部材と磁石の間の対向方向での間隔ｒが変動しない。このため、導電性部材には、式（１）に示すように、一定のクーロン力Ｆ１の他に、式（３）に示すように、回転体の回転速度の増大に伴い一次関数的に増大するローレンツ力Ｆ２が付与される。この結果、図１の制動力Ｆｘが得られる。 Here, in the brake device of patent document 1, the space | interval r in the opposing direction between an electroconductive member and a magnet does not change. For this reason, the conductive member increases in a linear function as the rotational speed of the rotating body increases as shown in Expression (3) in addition to the constant Coulomb force F1 as shown in Expression (1). Lorentz force F2 is applied. As a result, the braking force Fx shown in FIG. 1 is obtained.

一方、実施形態の制動装置では、回転体の回転速度が大きくなるほど、導電性部材と磁石の間の対向方向での間隔ｒが小さくなる。このため、式（１）、（３）に示すように、回転体の回転速度の増大に伴い間隔ｒが小さくなるほど、クーロン力Ｆ１、ローレンツ力Ｆ２が加速度的に増大し、その合力Ｆａや反作用力Ｆｂを用いた制動力Ｆｙも同様に加速度的に増大する。この結果、図１の制動力Ｆｙが得られる。よって、図１に示すように、回転体の回転速度の増大に伴い一次関数的に制動力が増大する従来の制動装置と比べて、回転体の高速回転時には十分な制動力を得つつ、その低速回転時に付与される制動力を小さくし易くなる。 On the other hand, in the braking device of the embodiment, the distance r in the facing direction between the conductive member and the magnet decreases as the rotational speed of the rotating body increases. For this reason, as shown in equations (1) and (3), the Coulomb force F1 and the Lorentz force F2 increase at an accelerated rate as the interval r decreases as the rotational speed of the rotating body increases, and the resultant force Fa and reaction are increased. Similarly, the braking force Fy using the force Fb increases in an accelerated manner. As a result, the braking force Fy shown in FIG. 1 is obtained. Therefore, as shown in FIG. 1, compared with the conventional braking device in which the braking force increases in a linear function as the rotational speed of the rotating body increases, while obtaining a sufficient braking force at the time of high-speed rotation of the rotating body, It becomes easy to reduce the braking force applied during low-speed rotation.

以下、実施形態、変形例では、同一の構成要素に同一の符号を付し、重複する説明を省略する。また、各図面では、説明の便宜のため、構成要素の一部を適宜省略したり、構成要素の寸法を適宜拡大、縮小して示す。 Hereinafter, in the embodiment and the modification, the same reference numerals are given to the same components, and the duplicate description is omitted. In the drawings, for convenience of explanation, some of the components are omitted as appropriate, and the dimensions of the components are appropriately enlarged and reduced.

（第１の実施の形態）
図２は、第１実施形態に係る制動装置１０を模式的に示す断面図である。制動装置１０は、固定体としてのハウジング１２と、第１回転体１４と、第２回転体１５とを備える。 (First embodiment)
FIG. 2 is a cross-sectional view schematically showing the braking device 10 according to the first embodiment. The braking device 10 includes a housing 12 as a fixed body, a first rotating body 14, and a second rotating body 15.

ハウジング１２は、不図示の外部構造体に固定される。ハウジング１２は、制動装置１０の他の構成部品を収容する。ハウジング１２は、筒状部１２ａと、筒状部１２ａの軸線方向の両端部をそれぞれ覆い塞ぐ底部１２ｂ及びキャップ部１２ｃとを有する。 The housing 12 is fixed to an external structure (not shown). The housing 12 accommodates other components of the braking device 10. The housing 12 includes a cylindrical portion 12a, and a bottom portion 12b and a cap portion 12c that cover and close both ends of the cylindrical portion 12a in the axial direction.

図３は、第１回転体１４及び第２回転体１５の斜視図である。第１回転体１４は、ハウジング１２内に、回転中心線Ｌａ周りに回転可能に収容される。第１回転体１４は、棒状の回転軸１４ａを有する。図２に示すように、回転軸１４ａは、ハウジング１２のキャップ部１２ｃに軸受２６を介して回転自在に支持される。軸受２６は、転がり軸受、滑り軸受等であってよい。本明細書では、第１回転体１４および第２回転体１５の回転中心線Ｌａに沿った方向を「回転軸方向Ｘ」、その回転中心線Ｌａを中心とする円の半径方向、円周方向を「径方向」、「周方向」として説明する。 FIG. 3 is a perspective view of the first rotating body 14 and the second rotating body 15. The first rotating body 14 is accommodated in the housing 12 so as to be rotatable around the rotation center line La. The first rotating body 14 has a rod-shaped rotating shaft 14a. As shown in FIG. 2, the rotating shaft 14 a is rotatably supported by the cap portion 12 c of the housing 12 via a bearing 26. The bearing 26 may be a rolling bearing, a sliding bearing, or the like. In the present specification, the direction along the rotation center line La of the first rotating body 14 and the second rotating body 15 is referred to as “rotating axis direction X”, the radial direction of the circle centered on the rotating center line La, and the circumferential direction. Are described as “radial direction” and “circumferential direction”.

第１回転体１４はさらに、回転軸１４ａの中途に設けられたフランジ部１４ｂと、第１回転体１４のフランジ部１４ｂに形成された第１カム部１４ｃとを有する。フランジ部１４ｂは、回転軸１４ａから径方向に張り出しており、第２回転体１５の内部に収容可能な大きさに形成される。第１カム部１４ｃは、後述する第２回転体１５の第２カム部１５ｃと係合するよう形成されたテーパ面を有する。 The first rotating body 14 further includes a flange portion 14b provided in the middle of the rotating shaft 14a and a first cam portion 14c formed on the flange portion 14b of the first rotating body 14. The flange portion 14 b protrudes in the radial direction from the rotating shaft 14 a and is formed in a size that can be accommodated in the second rotating body 15. The 1st cam part 14c has a taper surface formed so that it might engage with the 2nd cam part 15c of the 2nd rotary body 15 mentioned later.

第２回転体１５は、ハウジング１２内に、回転中心線Ｌａ周りに第１回転体１４と連れ回り可能に収容される。図３に示すように、第２回転体１５は、筒状部１５ａと、筒状部１５ａの内部に設けられた、第１回転体１４の回転軸１４ａを挿通支持する回転軸支持部１５ｂと、筒状部１５ａの内壁面に形成された第２カム部１５ｃとを有する。第２カム部１５ｃは、第１回転体１４の第１カム部１４ｃと係合するよう形成されたテーパ面を有する。 The second rotating body 15 is accommodated in the housing 12 so as to be able to rotate with the first rotating body 14 around the rotation center line La. As shown in FIG. 3, the second rotary body 15 includes a cylindrical portion 15a, and a rotary shaft support portion 15b provided inside the cylindrical portion 15a for inserting and supporting the rotary shaft 14a of the first rotary body 14. And a second cam portion 15c formed on the inner wall surface of the cylindrical portion 15a. The second cam portion 15 c has a tapered surface formed to engage with the first cam portion 14 c of the first rotating body 14.

第１回転体１４の回転軸１４ａが第２回転体１５の回転軸支持部１５ｂに挿通され、フランジ部１４ｂが筒状部１５ａ内に収容されると、第１カム部１４ｃと第２カム部１５ｃが係合する。第１カム部１４ｃと第２カム部１５ｃとが係合することにより、第２回転体１５は第１回転体１４に連れ回りする。回転により第１カム部１４ｃと第２カム部１５ｃのテーパ面間で滑りが生じると、第１回転体１４と第２回転体１５は回転軸方向Ｘで相対移動する。 When the rotating shaft 14a of the first rotating body 14 is inserted into the rotating shaft support portion 15b of the second rotating body 15 and the flange portion 14b is accommodated in the cylindrical portion 15a, the first cam portion 14c and the second cam portion. 15c is engaged. When the first cam portion 14 c and the second cam portion 15 c are engaged, the second rotating body 15 rotates with the first rotating body 14. When slip occurs between the tapered surfaces of the first cam portion 14c and the second cam portion 15c due to the rotation, the first rotating body 14 and the second rotating body 15 move relative to each other in the rotation axis direction X.

制動装置１０はさらに、導電性部材１６を備える。本実施形態において導電性部材１６は有底筒状であり、底部の第１導電性部材１６ａと、筒状部の第２導電性部材１６ｂとを有する。本実施形態において第１導電性部材１６ａと第２導電性部材１６ｂは一体に形成されているが、第１導電性部材１６ａと第２導電性部材１６ｂは別体であってもよい。導電性部材１６は、第１導電性部材１６ａがハウジング１２の底部１２ｂ上に設けられ、第２導電性部材１６ｂがハウジング１２の筒状部１２ａの内壁面に設けられるように、ハウジング１２内に配置される。 The braking device 10 further includes a conductive member 16. In the present embodiment, the conductive member 16 has a bottomed cylindrical shape, and includes a first conductive member 16a at the bottom and a second conductive member 16b at the cylindrical portion. In the present embodiment, the first conductive member 16a and the second conductive member 16b are integrally formed, but the first conductive member 16a and the second conductive member 16b may be separate. The conductive member 16 is formed in the housing 12 such that the first conductive member 16a is provided on the bottom 12b of the housing 12 and the second conductive member 16b is provided on the inner wall surface of the cylindrical portion 12a of the housing 12. Be placed.

導電性部材１６は、導電性を持つ素材であって、好ましくは非磁性体の素材である。非磁性体であれば磁石との間で磁気的吸引力が作用せず、その吸引力に起因する位置ずれを避けられる。このような素材として、たとえば、アルミニウム、銅等が用いられる。 The conductive member 16 is a conductive material, preferably a non-magnetic material. If it is a non-magnetic material, a magnetic attraction force does not act between the magnets, and a displacement due to the attraction force can be avoided. As such a material, for example, aluminum, copper or the like is used.

制動装置１０はさらに、第１磁石１８を備える。第１磁石１８は、フェライト磁石、ネオジム磁石等の永久磁石であってよい。本実施形態において、第１磁石１８は、第１導電性部材１６ａと回転軸方向Ｘに対向するように、第２回転体１５の筒状部１５ａの端部に設けられる。第１磁石１８は、第２回転体１５と一体的に回転可能である。 The braking device 10 further includes a first magnet 18. The first magnet 18 may be a permanent magnet such as a ferrite magnet or a neodymium magnet. In this embodiment, the 1st magnet 18 is provided in the edge part of the cylindrical part 15a of the 2nd rotary body 15 so that the 1st electroconductive member 16a may be opposed to the rotating shaft direction X. The first magnet 18 can rotate integrally with the second rotating body 15.

第１導電性部材１６ａ及び第１磁石１８は、第２回転体１５の回転に連動して周方向での相対位置が変化する。これに伴い、第１磁石１８が作る磁界に対して第１導電性部材１６ａが相対回転することで第１導電性部材１６ａに電磁誘導により渦電流が生じ、その渦電流に起因する制動力が第２回転体１５に付与される。 The relative positions of the first conductive member 16 a and the first magnet 18 in the circumferential direction change in conjunction with the rotation of the second rotating body 15. Along with this, the first conductive member 16a rotates relative to the magnetic field generated by the first magnet 18 to generate eddy current by electromagnetic induction in the first conductive member 16a, and the braking force due to the eddy current is increased. It is given to the second rotating body 15.

制動装置１０はさらに、第２磁石１９を備える。第２磁石１９は、フェライト磁石、ネオジム磁石等の永久磁石であってよい。本実施形態において、第２磁石１９は、第２導電性部材１６ｂと径方向に対向するように、第２回転体１５の筒状部１５ａの周側面に設けられる。第２磁石１９は、第２回転体１５と一体的に回転可能である。 The braking device 10 further includes a second magnet 19. The second magnet 19 may be a permanent magnet such as a ferrite magnet or a neodymium magnet. In this embodiment, the 2nd magnet 19 is provided in the surrounding side surface of the cylindrical part 15a of the 2nd rotary body 15 so that the 2nd electroconductive member 16b may be opposed to radial direction. The second magnet 19 can rotate integrally with the second rotating body 15.

第２導電性部材１６ｂ及び第２磁石１９は、第２回転体１５の回転に連動して周方向での相対位置が変化する。これに伴い、第２磁石１９が作る磁界に対して第２導電性部材１６ｂが相対回転することで第２導電性部材１６ｂに電磁誘導により渦電流が生じ、その渦電流に起因して、第２回転体１５の回転を止めようとする抵抗力が第２回転体１５に付与される。第２回転体１５の回転速度が大きくなるほど、第２回転体１５に付与される抵抗力は大きくなる。このように、本実施形態において第２導電性部材１６ｂ及び第２磁石１９は、第２回転体１５の回転速度が大きくなるほど、第２回転体１５の回転に対して大きな抵抗力を発生する「回転抵抗手段」として機能する。 The relative positions of the second conductive member 16 b and the second magnet 19 in the circumferential direction change in conjunction with the rotation of the second rotating body 15. Along with this, the second conductive member 16b rotates relative to the magnetic field generated by the second magnet 19 to generate eddy current by electromagnetic induction in the second conductive member 16b. A resistance force for stopping the rotation of the two-rotor 15 is applied to the second rotor 15. As the rotation speed of the second rotating body 15 increases, the resistance force applied to the second rotating body 15 increases. Thus, in the present embodiment, the second conductive member 16b and the second magnet 19 generate a greater resistance force against the rotation of the second rotating body 15 as the rotation speed of the second rotating body 15 increases. It functions as "rotation resistance means".

制動装置１０はさらに、付勢部材３４を備える。付勢部材３４は、たとえば、コイルスプリング等の弾性体であってよい。付勢部材３４は、回転軸方向Ｘにおいて第１導電性部材１６ａと第１磁石１８とが離間する方向に第２回転体１５を付勢する。 The braking device 10 further includes an urging member 34. The biasing member 34 may be an elastic body such as a coil spring, for example. The biasing member 34 biases the second rotating body 15 in a direction in which the first conductive member 16a and the first magnet 18 are separated from each other in the rotation axis direction X.

本実施形態において、第１回転体１４の第１カム部１４ｃと、第２回転体１５の第２カム部１５ｃと、付勢部材３４は、回転抵抗手段により付与される第２回転体１５の回転に対する抵抗力が大きくなるほど、第１導電性部材１６ａと第１磁石１８の対向方向での間隔が小さくなるように、第２回転体１５を移動させる移動機構を構成している。この移動機能による第２回転体１５の移動のメカニズムについては後述する。 In this embodiment, the 1st cam part 14c of the 1st rotary body 14, the 2nd cam part 15c of the 2nd rotary body 15, and the urging | biasing member 34 are the 2nd rotary body 15 provided by a rotation resistance means. A moving mechanism is configured to move the second rotating body 15 such that the greater the resistance to rotation, the smaller the distance between the first conductive member 16a and the first magnet 18 in the facing direction. A mechanism for moving the second rotating body 15 by this moving function will be described later.

図４は、第１実施形態に係る制動装置１０の動作状態を模式的に示す断面図である。以下、図２及び図４を参照して、制動装置１０の動作について説明する。図２は、第１回転体１４が低速で回転しているときの制動装置１０の状態を示す。図４は、第１回転体１４が高速で回転しているときの制動装置１０の状態を示す。図２及び図４には、第１磁石１８、第２磁石１９が作る磁場の磁束線の一部が図示されている。 FIG. 4 is a cross-sectional view schematically showing the operating state of the braking device 10 according to the first embodiment. Hereinafter, the operation of the braking device 10 will be described with reference to FIGS. 2 and 4. FIG. 2 shows a state of the braking device 10 when the first rotating body 14 is rotating at a low speed. FIG. 4 shows a state of the braking device 10 when the first rotating body 14 is rotating at a high speed. 2 and 4 show part of the magnetic flux lines of the magnetic field generated by the first magnet 18 and the second magnet 19.

まず、図２を参照して、第１回転体１４が低速で回転しているときの制動装置１０の動作を説明する。第１回転体１４が低速で回転しているとき、付勢部材３４の付勢力により第２回転体１５が第１回転体１４に押し付けられ、第１回転体１４が第２回転体１５の筒状部１５ａ内に完全に収容された状態となる。このとき、第１回転体１４の第１カム部１４ｃと第２回転体１５の第２カム部１５ｃは完全に係合した状態（言い換えると完全に噛み合った状態）となり、第１カム部１４ｃ及び第２カム部１５ｃを介して、第１回転体１４の回転力が第２回転体１５に伝達される、又は、第２回転体１５が受ける制動力が第１回転体１４に伝達される。なお、第１カム部１４ｃと第２カム部１５ｃが完全に係合した状態とは、第１カム部１４ｃのテーパ面の頂部が第２カム部１５ｃのテーパ面の谷部と係合し、第１カム部１４ｃのテーパ面の谷部が第２カム部１５ｃのテーパ面の頂部と係合する状態である（図３参照）。 First, the operation of the braking device 10 when the first rotating body 14 is rotating at a low speed will be described with reference to FIG. When the first rotating body 14 rotates at a low speed, the second rotating body 15 is pressed against the first rotating body 14 by the biasing force of the biasing member 34, and the first rotating body 14 is a cylinder of the second rotating body 15. It will be in the state accommodated completely in the shape part 15a. At this time, the first cam portion 14c of the first rotating body 14 and the second cam portion 15c of the second rotating body 15 are completely engaged (in other words, completely engaged), and the first cam portion 14c and The rotational force of the first rotating body 14 is transmitted to the second rotating body 15 or the braking force received by the second rotating body 15 is transmitted to the first rotating body 14 via the second cam portion 15c. The state in which the first cam portion 14c and the second cam portion 15c are completely engaged means that the top portion of the tapered surface of the first cam portion 14c is engaged with the valley portion of the tapered surface of the second cam portion 15c, The valley portion of the tapered surface of the first cam portion 14c is in a state of engaging with the top portion of the tapered surface of the second cam portion 15c (see FIG. 3).

第１回転体１４の回転が低速のとき、付勢部材３４の付勢力により第１導電性部材１６ａと第１磁石１８の対向方向での間隔Ｌｇが大きいので、図２に示すように、第１導電性部材１６ａには第１磁石１８の磁界が実質的に作用しない。ここでの「実質的に作用しない」とは、第１磁石１８の磁界が第１導電性部材１６ａに全く作用しない、又は、第１磁石１８の磁界が第１導電性部材１６ａに作用しても、第１導電性部材１６ａに生じる渦電流に起因する制動力が第２回転体１５に付与されない程度に僅かな磁界であることをいう。これにより、第１回転体１４の回転速度が小さいときは、第１導電性部材１６ａに生じる渦電流に起因する制動力が第２回転体１５に付与されなくなる。 When the rotation of the first rotating body 14 is low, the distance Lg in the facing direction of the first conductive member 16a and the first magnet 18 is large due to the biasing force of the biasing member 34. Therefore, as shown in FIG. The magnetic field of the first magnet 18 does not substantially act on the one conductive member 16a. Here, “substantially does not act” means that the magnetic field of the first magnet 18 does not act on the first conductive member 16a at all, or the magnetic field of the first magnet 18 acts on the first conductive member 16a. Also, it means that the braking force due to the eddy current generated in the first conductive member 16 a is a magnetic field that is so small that it is not applied to the second rotating body 15. Thereby, when the rotational speed of the first rotating body 14 is low, the braking force due to the eddy current generated in the first conductive member 16 a is not applied to the second rotating body 15.

また、第１回転体１４の回転が低速のときには、図２に示すように、第２磁石１９の磁界が第２導電性部材１６ｂに作用する。上述したように、第２導電性部材１６ｂに対して第２磁石１９が回転すると、第２導電性部材１６ｂに電磁誘導により渦電流が生じ、その渦電流に起因して、第２回転体１５の回転を止めようとする抵抗力が第２回転体１５に付与される。しかしながら、この抵抗力は回転速度に比例するため（図１の制動力Ｆｘを参照）、回転速度が小さいときには抵抗力も小さくなる。 When the rotation of the first rotating body 14 is low, the magnetic field of the second magnet 19 acts on the second conductive member 16b as shown in FIG. As described above, when the second magnet 19 rotates with respect to the second conductive member 16b, an eddy current is generated in the second conductive member 16b by electromagnetic induction, and the second rotating body 15 is caused by the eddy current. A resistance force to stop the rotation is applied to the second rotating body 15. However, since this resistance force is proportional to the rotation speed (see the braking force Fx in FIG. 1), the resistance force also decreases when the rotation speed is low.

以上述べたように、第１回転体１４の回転が低速のときには、第２回転体１５が受ける制動力、抵抗力は非常に小さい。したがって、制動装置１０による制動対象物（例えば障子や開き戸など）を低速で動かすとき、渦電流に起因する制動力を受けずに制動対象物を容易に動かせる。 As described above, when the rotation of the first rotating body 14 is low, the braking force and the resistance force received by the second rotating body 15 are very small. Therefore, when a braking object (for example, a shoji or a hinged door) by the braking device 10 is moved at a low speed, the braking object can be easily moved without receiving a braking force caused by eddy current.

次に、図４を参照して、第１回転体１４が高速で回転しているときの制動装置１０の動作を説明する。第１回転体１４の回転速度が大きくなると、第２磁石１９の磁界により第２導電性部材１６ｂに生じる渦電流に起因する抵抗力が大きくなり、第２回転体１５の回転を止めようとする。その結果、回転しようとする第１回転体１４の第１カム部１４ｃが停止しようとする第２回転体１５の第２カム部１５ｃを押圧する力が増大し、付勢部材３４による付勢力に抗して第２回転体１５が第１導電性部材１６ａの方向に移動する。すなわち、第１導電性部材１６ａと第１磁石１８の対向方向での間隔Ｌｇが小さくなる。 Next, the operation of the braking device 10 when the first rotating body 14 is rotating at high speed will be described with reference to FIG. When the rotation speed of the first rotating body 14 increases, the resistance force caused by the eddy current generated in the second conductive member 16b by the magnetic field of the second magnet 19 increases, and the rotation of the second rotating body 15 is stopped. . As a result, the force by which the first cam portion 14c of the first rotating body 14 to be rotated presses the second cam portion 15c of the second rotating body 15 to be stopped increases, and the biasing force by the biasing member 34 is increased. The second rotating body 15 moves against the first conductive member 16a. That is, the distance Lg between the first conductive member 16a and the first magnet 18 in the facing direction is reduced.

第１磁石１８が第１導電性部材１６ａに近づく途中で第１導電性部材１６ａには第１磁石１８の磁界が作用する。第１磁石１８の磁界が第１導電性部材１６ａに作用すると、渦電流に起因する制動力が第２回転体１５に付与される。この制動力は、前述の通り、回転速度が大きくなり、それに伴い第１導電性部材１６ａと第１磁石１８の間隔Ｌｇが狭まるにつれて加速度的に増大する（図１の制動力Ｆｙを参照）。この制動力は、第１カム部１４ｃ及び第２カム部１５ｃを介して、第１回転体１４に伝達される。 While the first magnet 18 approaches the first conductive member 16a, the magnetic field of the first magnet 18 acts on the first conductive member 16a. When the magnetic field of the first magnet 18 acts on the first conductive member 16a, the braking force resulting from the eddy current is applied to the second rotating body 15. As described above, the braking force increases at an increasing speed as the rotational speed increases and the distance Lg between the first conductive member 16a and the first magnet 18 decreases accordingly (see the braking force Fy in FIG. 1). This braking force is transmitted to the first rotating body 14 via the first cam portion 14c and the second cam portion 15c.

制動力により第２回転体１５の回転速度が小さくなると、第２回転体１５が受ける抵抗力が小さくなる。これに伴い、付勢部材３４の付勢力によって、第２回転体１５は、第１回転体１４の方向に移動し、図２に示す状態に戻る。 When the rotational speed of the second rotating body 15 is reduced by the braking force, the resistance force received by the second rotating body 15 is reduced. Accordingly, the second rotating body 15 moves in the direction of the first rotating body 14 by the biasing force of the biasing member 34 and returns to the state shown in FIG.

以上説明したように、第１実施形態に係る制動装置１０によれば、回転体の高速回転時には十分な制動力を得つつ、その低速回転時に付与される制動力を小さくできる。 As described above, according to the braking device 10 according to the first embodiment, the braking force applied during the low-speed rotation can be reduced while obtaining a sufficient braking force during the high-speed rotation of the rotating body.

第１実施形態に係る制動装置１０によれば、回転軸方向に対向する第１導電性部材１６ａ及び第１磁石１８により発生する制動力に加えて、径方向に対向する第２導電性部材１６ｂ及び第２磁石１９により発生する抵抗力が第２回転体１５、ひいては第１回転体１４に作用するので、回転軸方向に対向する導電性部材及び磁石により発生する制動力のみの制動装置と比較して、大きな制動力を回転体に作用させることができる。 According to the braking device 10 according to the first embodiment, in addition to the braking force generated by the first conductive member 16a and the first magnet 18 facing in the rotation axis direction, the second conductive member 16b facing in the radial direction. Since the resistance force generated by the second magnet 19 acts on the second rotating body 15, and thus the first rotating body 14, it is compared with a braking device that only has a braking force generated by the conductive member and the magnet facing each other in the rotation axis direction. Thus, a large braking force can be applied to the rotating body.

また、第１実施形態に係る制動装置１０では、第１回転体１４に形成した第１カム部１４ｃと第２回転体１５に形成した第２カム部１５ｃから成るカム機構により、第１導電性部材１６ａと第１磁石１８の間隔Ｌｇを調整している。よって、第１導電性部材１６ａと第１磁石１８の間の間隔Ｌｇを調整するにあたり、第１導電性部材１６ａと第１磁石１８を径方向に相対移動させるための空間を確保せずともよくなる。これにより、制動装置１０の径方向寸法の小型化を図れる。 Further, in the braking device 10 according to the first embodiment, the first conductive property is provided by the cam mechanism including the first cam portion 14 c formed on the first rotating body 14 and the second cam portion 15 c formed on the second rotating body 15. The distance Lg between the member 16a and the first magnet 18 is adjusted. Therefore, in adjusting the distance Lg between the first conductive member 16a and the first magnet 18, it is not necessary to secure a space for relatively moving the first conductive member 16a and the first magnet 18 in the radial direction. . As a result, the radial dimension of the braking device 10 can be reduced.

（第２実施形態）
図５は、第２実施形態に係る制動装置１００を模式的に示す断面図である。第２実施形態に係る制動装置１００は、第２回転体１５の回転速度が大きくなるほど、第２回転体１５の回転に対して大きな抵抗力を発生する「回転抵抗手段」として、ハウジング１２内に封入された粘性流体１０２を用いている点が、第１実施形態に係る制動装置１０と異なる。制動装置１００においては、ハウジング１２の底部１２ｂに設けられる導電性部材１１６は板状体であり、第１実施形態に係る制動装置１０における第２導電性部材１６ｂ及び該第２導電性部材１６ｂと径方向に対向配置される第２磁石１９は設けられていない。 (Second Embodiment)
FIG. 5 is a cross-sectional view schematically showing the braking device 100 according to the second embodiment. The braking device 100 according to the second embodiment is provided in the housing 12 as “rotation resistance means” that generates a greater resistance force against the rotation of the second rotating body 15 as the rotation speed of the second rotating body 15 increases. The point which uses the enclosed viscous fluid 102 differs from the braking device 10 which concerns on 1st Embodiment. In the braking device 100, the conductive member 116 provided on the bottom 12b of the housing 12 is a plate-like body, and the second conductive member 16b and the second conductive member 16b in the braking device 10 according to the first embodiment The second magnet 19 disposed to face the radial direction is not provided.

図６は、第２実施形態に係る制動装置１００の動作状態を模式的に示す断面図である。以下、図５及び図６を参照して、制動装置１００の動作について説明する。図５は、第１回転体１４が低速で回転しているときの制動装置１００の状態を示す。図６は、第１回転体１４が高速で回転しているときの制動装置１００の状態を示す。図５及び図６には、磁石１１８が作る磁場の磁束線の一部が図示されている。 FIG. 6 is a cross-sectional view schematically showing an operating state of the braking device 100 according to the second embodiment. Hereinafter, the operation of the braking device 100 will be described with reference to FIGS. 5 and 6. FIG. 5 shows a state of the braking device 100 when the first rotating body 14 is rotating at a low speed. FIG. 6 shows a state of the braking device 100 when the first rotating body 14 is rotating at a high speed. 5 and 6 show part of the magnetic flux lines of the magnetic field created by the magnet 118. FIG.

まず、図５を参照して、第１回転体１４が低速で回転しているときの制動装置１００の動作を説明する。第１回転体１４が低速で回転しているとき、付勢部材３４の付勢力により第２回転体１５が第１回転体１４に押し付けられ、第１回転体１４が第２回転体１５の筒状部１５ａ内に完全に収容された状態となる。このとき、第１回転体１４の第１カム部１４ｃと第２回転体１５の第２カム部１５ｃは完全に係合した状態となり、第１カム部１４ｃ及び第２カム部１５ｃを介して、第１回転体１４の回転力が第２回転体１５に伝達される、又は、第２回転体１５が受ける制動力が第１回転体１４に伝達される。 First, the operation of the braking device 100 when the first rotating body 14 is rotating at a low speed will be described with reference to FIG. When the first rotating body 14 rotates at a low speed, the second rotating body 15 is pressed against the first rotating body 14 by the biasing force of the biasing member 34, and the first rotating body 14 is a cylinder of the second rotating body 15. It will be in the state accommodated completely in the shape part 15a. At this time, the first cam portion 14c of the first rotating body 14 and the second cam portion 15c of the second rotating body 15 are completely engaged, and the first cam portion 14c and the second cam portion 15c are interposed, The rotational force of the first rotating body 14 is transmitted to the second rotating body 15, or the braking force received by the second rotating body 15 is transmitted to the first rotating body 14.

第１回転体１４の回転が低速のとき、付勢部材３４の付勢力により導電性部材１１６と磁石１１８の対向方向での間隔Ｌｇが大きいので、図５に示すように、導電性部材１１６には第２回転体１５に設けられた磁石１１８の磁界が実質的に作用しない。これにより、第１回転体１４の回転速度が小さいときは、導電性部材１１６に生じる渦電流に起因する制動力が第２回転体１５に付与されなくなる。 When the rotation of the first rotating body 14 is low, the gap Lg between the conductive member 116 and the magnet 118 is large due to the biasing force of the biasing member 34. Therefore, as shown in FIG. The magnetic field of the magnet 118 provided on the second rotating body 15 does not substantially act. Thereby, when the rotational speed of the first rotating body 14 is low, the braking force due to the eddy current generated in the conductive member 116 is not applied to the second rotating body 15.

上述したように、本実施形態に係る制動装置１００では、ハウジング１２内に粘性流体１０２が封入されている。この粘性流体１０２は、第２回転体１５の回転を止めようとする抵抗力を生じる。しかしながら、粘性流体１０２による抵抗力は回転体の回転速度が小さいときには殆ど無視できる程度に小さくなる。したがって、第１回転体１４の回転が低速のときには、第２回転体１５が受ける制動力、抵抗力は非常に小さいので、制動装置１００による制動対象物を低速で動かすとき、渦電流に起因する制動力を受けずに制動対象物を容易に動かせる。 As described above, in the braking device 100 according to this embodiment, the viscous fluid 102 is sealed in the housing 12. The viscous fluid 102 generates a resistance force that tries to stop the rotation of the second rotating body 15. However, the resistance force due to the viscous fluid 102 is small enough to be ignored when the rotational speed of the rotating body is small. Therefore, when the rotation of the first rotating body 14 is low, the braking force and resistance force received by the second rotating body 15 are very small. Therefore, when the object to be braked by the braking device 100 is moved at low speed, it is caused by eddy current. The object to be braked can be easily moved without receiving a braking force.

次に、図６を参照して、第１回転体１４が高速で回転しているときの制動装置１００の動作を説明する。第１回転体１４の回転速度が大きくなると、粘性流体１０２に起因する抵抗力が大きくなり、第２回転体１５の回転を止めようとする。その結果、回転しようとする第１回転体１４の第１カム部１４ｃが停止しようとする第２回転体１５の第２カム部１５ｃを押圧する力が増大し、付勢部材３４による付勢力に抗して第２回転体１５が導電性部材１１６の方向に移動する。すなわち、導電性部材１１６と磁石１１８の対向方向での間隔Ｌｇが小さくなる。 Next, the operation of the braking device 100 when the first rotating body 14 is rotating at high speed will be described with reference to FIG. When the rotation speed of the first rotating body 14 increases, the resistance force due to the viscous fluid 102 increases, and the rotation of the second rotating body 15 is stopped. As a result, the force by which the first cam portion 14c of the first rotating body 14 to be rotated presses the second cam portion 15c of the second rotating body 15 to be stopped increases, and the biasing force by the biasing member 34 is increased. The second rotating body 15 moves against the conductive member 116 against this. That is, the distance Lg between the conductive member 116 and the magnet 118 in the facing direction is reduced.

磁石１１８が導電性部材１１６に近づく途中で導電性部材１１６には磁石１１８の磁界が作用する。磁石１１８の磁界が導電性部材１１６に作用すると、渦電流に起因する制動力が第２回転体１５に付与される。この制動力は、前述の通り、回転速度が大きくなり、それに伴い導電性部材１１６と磁石１１８の間隔Ｌｇが狭まるにつれて加速度的に増大する（図１の制動力Ｆｙを参照）。この制動力は、第１カム部１４ｃ及び第２カム部１５ｃを介して、第１回転体１４に伝達される。 While the magnet 118 approaches the conductive member 116, the magnetic field of the magnet 118 acts on the conductive member 116. When the magnetic field of the magnet 118 acts on the conductive member 116, a braking force due to eddy current is applied to the second rotating body 15. As described above, the braking force increases at an increasing speed as the rotational speed increases and the distance Lg between the conductive member 116 and the magnet 118 decreases accordingly (see the braking force Fy in FIG. 1). This braking force is transmitted to the first rotating body 14 via the first cam portion 14c and the second cam portion 15c.

制動力により第２回転体１５の回転速度が小さくなると、第２回転体１５が粘性流体１０２から受ける抵抗力が小さくなる。これに伴い、付勢部材３４の付勢力によって、第２回転体１５は、第１回転体１４の方向に移動し、図５に示す状態に戻る。 When the rotational speed of the second rotating body 15 decreases due to the braking force, the resistance force that the second rotating body 15 receives from the viscous fluid 102 decreases. Accordingly, the second rotating body 15 moves in the direction of the first rotating body 14 by the biasing force of the biasing member 34 and returns to the state shown in FIG.

以上説明したように、第２実施形態に係る制動装置１００によっても、回転体の高速回転時には十分な制動力を得つつ、その低速回転時に付与される制動力を小さくできる。 As described above, the braking device 100 according to the second embodiment can also reduce the braking force applied during the low-speed rotation while obtaining a sufficient braking force during the high-speed rotation of the rotating body.

第２実施形態に係る制動装置１００によれば、回転軸方向に対向する導電性部材１１６及び磁石１１８により発生する制動力に加えて、粘性流体１０２により発生する抵抗力が第２回転体１５、ひいては第１回転体１４に作用するので、回転軸方向に対向する導電性部材及び磁石により発生する制動力のみの制動装置と比較して、大きな制動力を回転体に作用させることができる。 According to the braking device 100 according to the second embodiment, in addition to the braking force generated by the conductive member 116 and the magnet 118 facing each other in the rotation axis direction, the resistance force generated by the viscous fluid 102 is the second rotating body 15. As a result, since it acts on the 1st rotary body 14, compared with the braking device only of the braking force which generate | occur | produces with the electroconductive member and magnet which oppose the rotating shaft direction, a big braking force can be made to act on a rotary body.

以上、本発明の実施形態の例や変形例について詳細に説明した。前述した実施形態や変形例は、いずれも本発明を実施するにあたっての具体例を示したものにすぎない。実施形態や変形例の内容は、本発明の技術的範囲を限定するものではなく、請求の範囲に規定された発明の思想を逸脱しない範囲において、構成要素の変更、追加、削除等の多くの設計変更が可能である。前述の実施形態では、このような設計変更が可能な内容に関して、「実施形態の」「実施形態では」等との表記を付して強調しているが、そのような表記のない内容でも設計変更が許容される。また、図面の断面に付したハッチングは、ハッチングを付した対象の材質を限定するものではない。 Heretofore, examples and modifications of the embodiment of the present invention have been described in detail. The above-described embodiments and modification examples are only specific examples for carrying out the present invention. The contents of the embodiments and the modifications do not limit the technical scope of the present invention, and many changes, additions, deletions, etc. of the constituent elements do not depart from the spirit of the invention defined in the claims. Design changes are possible. In the above-described embodiment, contents that can be changed in this way are emphasized with the notation of “embodiment”, “in the embodiment”, etc. Changes are allowed. Moreover, the hatching given to the cross section of drawing does not limit the material of the hatched object.

上述の実施形態では、回転軸方向に対向して配置される導電性部材及び磁石のうち、導電性部材をハウジングに設け、磁石を第２回転体に設けた例を説明した。しかしながら、これとは逆に、回転軸方向に対向して配置される導電性部材及び磁石のうち、磁石をハウジングに設け、導電性部材を第２回転体に設けてもよい。 In the above-described embodiment, the example in which the conductive member is provided in the housing and the magnet is provided in the second rotating body among the conductive members and magnets arranged to face the rotation axis direction has been described. However, conversely, among the conductive members and magnets arranged facing the rotation axis direction, the magnets may be provided in the housing and the conductive members may be provided in the second rotating body.

また、上述の第１実施形態では、第２回転体の径方向に対向して配置される第２導電性部材及び第２磁石のうち、第２導電性部材をハウジングに設け、第２磁石を第２回転体に設けた例を説明した。しかしながら、これとは逆に、第２回転体の径方向に対向して配置される第２導電性部材及び第２磁石のうち、第２磁石をハウジングに設け、第２導電性部材を第２回転体に設けてもよい。 In the first embodiment, the second conductive member is provided in the housing among the second conductive member and the second magnet that are arranged opposite to each other in the radial direction of the second rotating body, and the second magnet is The example provided in the 2nd rotary body was demonstrated. However, conversely, of the second conductive member and the second magnet that are arranged opposite to each other in the radial direction of the second rotating body, the second magnet is provided in the housing, and the second conductive member is the second conductive member. You may provide in a rotary body.

また、上述の実施形態では、第２回転体を移動させる移動機構としてカム機構を用いた例を説明した。しかしながら、移動機構はカム機構に限定されず、他の構成を用いることができる。 In the above-described embodiment, the example in which the cam mechanism is used as the moving mechanism that moves the second rotating body has been described. However, the moving mechanism is not limited to the cam mechanism, and other configurations can be used.

また、上述の実施形態では、磁石として永久磁石を用いたが、電磁石が用いられてもよい。 Moreover, in the above-mentioned embodiment, although the permanent magnet was used as a magnet, an electromagnet may be used.

以上の実施形態、変形例により具体化される発明を一般化すると、以下の技術的思想が導かれる。以下、発明が解決しようとする課題に記載の態様を用いて説明する。 Generalizing the invention embodied by the above embodiments and modifications leads to the following technical idea. Hereinafter, description will be made by using aspects described in the problems to be solved by the invention.

第２態様の制動装置は、第１態様において、回転抵抗手段は、第２回転体の径方向に対向して配置される第２導電性部材及び第２磁石を備え、導電性部材及び第２磁石の一方は回転体の周側面に設けられ、それらの他方はハウジングの内壁面に設けられてもよい。 The braking device according to a second aspect is the braking device according to the first aspect, wherein the rotation resistance means includes a second conductive member and a second magnet arranged to face each other in the radial direction of the second rotating body. One of the magnets may be provided on the peripheral side surface of the rotating body, and the other of them may be provided on the inner wall surface of the housing.

第３態様の制動装置は、第１態様において、回転抵抗手段は、ハウジング内に封入された粘性流体を備えてもよい。 In the braking device of the third aspect, in the first aspect, the rotation resistance means may include a viscous fluid sealed in the housing.

第４態様の制動装置は、第１〜第３態様において、移動機構は、第１回転体に設けられる第１カム部と、第２回転体に設けられ、第１カム部と係合する第２カム部と、導電性部材と磁石とが離間する方向に第２回転体を付勢する付勢部材とを備えてもよい。 The braking device according to a fourth aspect is the first to third aspects, in which the moving mechanism is a first cam portion provided in the first rotating body and a second cam provided in the second rotating body and engaged with the first cam portion. You may provide the 2 cam part and the urging member which urges | biases a 2nd rotary body in the direction which an electroconductive member and a magnet space apart.

第５態様の制動装置は、第４態様において、移動機構は、回転抵抗手段により付与される抵抗力が大きくなるほど、第１カム部が第２カム部を押圧する力が増大し、付勢部材による付勢力に抗して第２回転体が移動するよう構成されてもよい。 The braking device of the fifth aspect is the biasing member according to the fourth aspect, in which the moving mechanism increases the force with which the first cam portion presses the second cam portion as the resistance force applied by the rotation resistance means increases. The second rotating body may be moved against the urging force of.

１０，１００制動装置、１２ハウジング、１４第１回転体、１４ｃ第１カム部、１５第２回転体、１５ｃ第２カム部、１６ａ第１導電性部材、１６ｂ第２導電性部材、１８第１磁石、１９第２磁石、３４付勢部材、１０２粘性流体，１１６導電性部材、１１８磁石。 DESCRIPTION OF SYMBOLS 10,100 Braking device, 12 Housing, 14 1st rotary body, 14c 1st cam part, 15 2nd rotary body, 15c 2nd cam part, 16a 1st electroconductive member, 16b 2nd electroconductive member, 18 1st Magnet, 19 second magnet, 34 biasing member, 102 viscous fluid, 116 conductive member, 118 magnet.

Claims

A housing;
A first rotating body rotatably accommodated in the housing;
A second rotating body housed in the housing so as to be able to rotate with the first rotating body;
A conductive member and a magnet disposed opposite to each other in a rotation axis direction of the first rotating body and the second rotating body, wherein one of the conductive member and the magnet is integrally formed with the second rotating body. A conductive member and a magnet provided on the housing, the other of which is rotatably provided;
Rotation resistance means for generating a greater resistance force to the rotation of the second rotating body as the rotation speed of the second rotating body increases;
A moving mechanism that moves the second rotating body such that the greater the resistance to rotation of the second rotating body, the smaller the gap between the conductive member and the magnet in the facing direction;
A braking device comprising:

The rotation resistance means includes a second conductive member and a second magnet that are arranged to face each other in the radial direction of the second rotating body,
2. The braking device according to claim 1, wherein one of the conductive member and the second magnet is provided on a peripheral side surface of the rotating body, and the other is provided on an inner wall surface of the housing.

The braking device according to claim 1, wherein the rotation resistance unit includes a viscous fluid sealed in the housing.

The moving mechanism is
A first cam portion provided on the first rotating body;
A second cam portion provided on the second rotating body and engaged with the first cam portion;
A biasing member that biases the second rotating body in a direction in which the conductive member and the magnet are separated from each other;
The braking device according to any one of claims 1 to 3, further comprising:

As the resistance force applied by the rotation resistance means increases, the moving mechanism increases the force with which the first cam portion presses the second cam portion, and resists the biasing force by the biasing member. The braking device according to claim 4, wherein the second rotating body is configured to move.