JP7052122B1 - Centrifugal brake - Google Patents

Centrifugal brake Download PDF

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JP7052122B1
JP7052122B1 JP2021088694A JP2021088694A JP7052122B1 JP 7052122 B1 JP7052122 B1 JP 7052122B1 JP 2021088694 A JP2021088694 A JP 2021088694A JP 2021088694 A JP2021088694 A JP 2021088694A JP 7052122 B1 JP7052122 B1 JP 7052122B1
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support shaft
weight
rotating body
inner peripheral
peripheral surface
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JP2022181644A (en
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汐里 池川
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Origin Co Ltd
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Priority to CN202280036665.0A priority patent/CN117355679A/en
Priority to PCT/JP2022/020765 priority patent/WO2022249961A1/en
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    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • E06B9/26—Lamellar or like blinds, e.g. venetian blinds
    • E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
    • E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
    • E06B9/32—Operating, guiding, or securing devices therefor
    • E06B9/322—Details of operating devices, e.g. pulleys, brakes, spring drums, drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Braking Arrangements (AREA)
  • Blinds (AREA)

Abstract

【課題】支持軸の両端が夫々端板に接続固定された状態で一体的に成形される構成であっても、ウェイトを支持軸に充分容易に装着することができる、遠心ブレーキを提供すること。【解決手段】支持軸１８の断面形状は、基準円４２の周縁の一部をなす円弧状外周部１８ａと上記基準円の周縁の一部の径を局所的に低減させた低減部１８ｂとを有し、ウェイト３０において回転体６の支持軸１８が挿通される軸穴４６の断面形状は、上記基準円の周縁の一部をなす円弧状内周部４６ａとこの円弧状内周部の両端から軸方向に対して垂直方向に延出して連通溝４８を規定する一対の溝規定部４６ｂとを有し、連通溝４８はウェイト３０の外周面において開放されており、支持軸１８の低減部１８ｂを軸穴４６の溝規定部４６ｂに対向させることで、支持軸１８は連通溝４８に進入して支持軸１８の円弧状外周部１８ａが軸穴４６の円弧状内周部４６ｂと面接触可能となる様に構成する。【選択図】図６PROBLEM TO BE SOLVED: To provide a centrifugal brake capable of sufficiently easily attaching a weight to a support shaft even if both ends of the support shaft are connected and fixed to an end plate and integrally molded. .. SOLUTION: The cross-sectional shape of a support shaft 18 includes an arc-shaped outer peripheral portion 18a forming a part of the peripheral edge of a reference circle 42 and a reduction portion 18b in which the diameter of a part of the peripheral edge of the reference circle is locally reduced. The cross-sectional shape of the shaft hole 46 through which the support shaft 18 of the rotating body 6 is inserted in the weight 30 is an arc-shaped inner peripheral portion 46a forming a part of the peripheral edge of the reference circle and both ends of the arc-shaped inner peripheral portion. It has a pair of groove defining portions 46b extending in a direction perpendicular to the axial direction to define the communicating groove 48, and the communicating groove 48 is open on the outer peripheral surface of the weight 30 to reduce the support shaft 18. By facing the 18b to the groove defining portion 46b of the shaft hole 46, the support shaft 18 enters the communication groove 48 and the arcuate outer peripheral portion 18a of the support shaft 18 comes into surface contact with the arcuate inner peripheral portion 46b of the shaft hole 46. Configure to be possible. [Selection diagram] FIG. 6

Description

本発明は、遠心ブレーキに関する。 The present invention relates to a centrifugal brake.

室内の窓際には日射を避ける等の目的からブラインドが配設されることがある。ブラインドは水平方向に延びるスラットを有し、スラットは上下方向に多数配置され、多数のスラットは夫々昇降コード（操作コードと称されることもある）によって上下方向に接続される。ブラインドは更に、最上端に位置するスラットの更に上方に配置される巻き取り機構と、最下端に位置するスラットの更に下方に配置されるボトムレール（ボトムパイプ或いはウェイトバーと称されることもある）とを備え、昇降コードの一端が巻き取り機構に他端がボトムレールに夫々接続される。かようなブラインドにあっては、巻き取り機構を操作して昇降コードを巻き取ることでボトムレールは上昇し、巻き取り機構が備える適宜のロック機構を作動させることでボトムレールは上昇した任意の位置で保持される。そして、上記ロック機構の作動を解除すればボトムレールは降下する。ここで、上記ロック機構の作動を解除するとボトムレールは自由落下してしまうことから、その降下速度を低減させるべく巻き取り機構には適宜のブレーキ機構が組み込まれることがある。このようなブレーキ機構としては周知の遠心ブレーキが採用されることが多い。 Blinds may be placed near the windows in the room for the purpose of avoiding sunlight. The blind has slats extending in the horizontal direction, and a large number of slats are arranged in the vertical direction, and each of the large number of slats is connected in the vertical direction by an elevating cord (sometimes referred to as an operation cord). The blind is further referred to as a take-up mechanism located further above the slat located at the uppermost end and a bottom rail (sometimes referred to as a bottom pipe or weight bar) located further below the slat located at the lowermost end. ), And one end of the elevating cord is connected to the take-up mechanism and the other end is connected to the bottom rail. In such a blind, the bottom rail is raised by operating the take-up mechanism to wind up the elevating cord, and the bottom rail is raised by operating the appropriate lock mechanism provided in the take-up mechanism. Held in position. Then, if the operation of the lock mechanism is released, the bottom rail descends. Here, since the bottom rail falls freely when the operation of the lock mechanism is released, an appropriate brake mechanism may be incorporated in the take-up mechanism in order to reduce the descent speed. As such a braking mechanism, a well-known centrifugal brake is often adopted.

下記特許文献１には、遠心ブレーキの一例として、断面円形の内周面を有する筒状のハウジングと、前記ハウジングの内側に配設される回転体とを具備し、前記回転体は前記ハウジングの前記内周面の中心軸を軸に回転可能であり、前記回転体は前記中心軸に対して偏心して軸方向に延びる支持軸を有し、前記支持軸にはウェイトが旋回可能に軸支されており、前記回転体が回転すると、前記ウェイトが前記支持軸を中心に旋回して前記ウェイトの外周面が前記ハウジングの前記内周面に当接する遠心ブレーキが開示されている。 In Patent Document 1 below, as an example of a centrifugal brake, a cylindrical housing having an inner peripheral surface having a circular cross section and a rotating body disposed inside the housing are provided, and the rotating body is the housing. The rotating body can rotate about the central axis of the inner peripheral surface, the rotating body has a support shaft eccentric to the central axis and extends in the axial direction, and a weight is rotatably supported on the support shaft. Disclosed is a centrifugal brake in which when the rotating body rotates, the weight turns around the support shaft and the outer peripheral surface of the weight abuts on the inner peripheral surface of the housing.

実公平１－４５３５３号公報Jitsufuku No. 1-43533

然しながら、特許文献１に開示された遠心ブレーキにあっては、ウェイトを軸支する支持軸が所謂片持ち梁状態で支持されていることから、回転体が回転すると、この回転に起因して生じるウェイトの遠心力によって支持軸の基端部には過大な剪断応力が加わり、かような剪断応力により支持軸が折損してしまう虞がある。 However, in the centrifugal brake disclosed in Patent Document 1, since the support shaft that supports the weight is supported in a so-called cantilever state, when the rotating body rotates, it occurs due to this rotation. Excessive shear stress is applied to the base end portion of the support shaft due to the centrifugal force of the weight, and there is a possibility that the support shaft may be broken due to such shear stress.

ところで、本発明者は本願に先立って出願した特願２０２０－１８７９６１の明細書及び図面において、支持軸の両端が夫々端板に接続固定され、支持軸が所謂両持ち梁状態で支持される遠心ブレーキを提案した（以下「先行遠心ブレーキ」という）。この遠心ブレーキにあっては、支持軸が所謂両持ち梁状態で支持されていることに起因して、支持軸に負荷がかかっても支持軸の基端部にかかる剪断応力を低減させることができる。それ故に、回転体の回転に起因して生じるウェイトの遠心力によって支持軸が折損してしまうことは可及的に防止される。 By the way, in the specification and drawings of Japanese Patent Application No. 2020-187961 filed prior to the present application, the present inventor is a centrifuge in which both ends of a support shaft are connected and fixed to end plates, respectively, and the support shaft is supported in a so-called double-sided beam state. Proposed a brake (hereinafter referred to as "preceding centrifugal brake"). In this centrifugal brake, since the support shaft is supported in a so-called double-sided beam state, it is possible to reduce the shear stress applied to the base end portion of the support shaft even if a load is applied to the support shaft. can. Therefore, it is possible to prevent the support shaft from being broken by the centrifugal force of the weight caused by the rotation of the rotating body.

而して、上記先行遠心ブレーキも充分に満足し得るものではなく、次のとおりの解決すべき課題を有する。即ち、支持軸の両端が接続固定される２つの端板のうちの一方のみが支持軸の一端と接続固定された状態で一体的に成形され、ウェイトに形成された軸穴に支持軸が挿通せしめられた後に、上記一方の端板及び支持軸とは別体で成形された他方の端板に支持軸の他端が接続固定（圧入）される、つまり２つの端板は各別に成形されるため、部品点数が増大し、組み立て工程が煩雑となる。また、支持軸の両端は２つの端板によって接続固定されて支持軸は両持ち梁状態で支持されるものの、他方の端板は支持軸と一体成形されておらず、端板に形成された穴に支持軸の端部が圧入されるにすぎないことから、上記遠心力によって生じる支持軸のひずみに起因して圧入された支持軸の端部と端板との嵌合力が低下し、支持軸の強度を充分に確保することができなくなる虞もある。 Therefore, the preceding centrifugal brake is not sufficiently satisfactory, and has the following problems to be solved. That is, only one of the two end plates to which both ends of the support shaft are connected and fixed is integrally molded in a state of being connected and fixed to one end of the support shaft, and the support shaft is inserted into the shaft hole formed in the weight. After being squeezed, the other end of the support shaft is connected and fixed (press-fitted) to the other end plate molded separately from the one end plate and the support shaft, that is, the two end plates are molded separately. Therefore, the number of parts increases and the assembly process becomes complicated. Further, both ends of the support shaft are connected and fixed by two end plates, and the support shaft is supported in a double-sided beam state, but the other end plate is not integrally molded with the support shaft and is formed on the end plate. Since the end of the support shaft is only press-fitted into the hole, the fitting force between the end of the support shaft and the end plate that has been press-fitted due to the strain of the support shaft caused by the centrifugal force is reduced, and the support is supported. There is a risk that the strength of the shaft cannot be sufficiently secured.

本発明は上記事実に鑑みてなされたものであり、その主たる技術的課題は、支持軸の両端が夫々端板に接続固定された状態で一体的に成形される構成であっても、ウェイトを支持軸に充分容易に装着することができる、新規且つ改良された遠心ブレーキを提供することである。 The present invention has been made in view of the above facts, and its main technical problem is to provide weights even in a configuration in which both ends of a support shaft are connected and fixed to end plates, respectively. It is to provide a new and improved centrifugal brake that can be easily mounted on a support shaft.

本発明者は、鋭意検討の結果、支持軸の断面形状は、基準円の周縁の一部をなす円弧状外周部と上記基準円の周縁の一部の径を局所的に低減させた低減部とを有し、ウェイトにおいて回転体の支持軸が挿通される軸穴の断面形状は、上記基準円の周縁の一部をなす円弧状内周部とこの円弧状内周部の両端から軸方向に対して垂直方向に延出して連通溝を規定する一対の溝規定部とを有し、連通溝はウェイトの外周面において開放されており、支持軸の低減部を軸穴の溝規定部に対向させることで、支持軸は連通溝に進入して支持軸の円弧状外周部が軸穴の円弧状内周部と面接触可能となる様に構成することで、上記主たる技術的課題を達成できることを見出した。 As a result of diligent studies, the present inventor has determined that the cross-sectional shape of the support shaft is a reduction portion in which the diameters of an arcuate outer peripheral portion forming a part of the peripheral edge of the reference circle and a part of the peripheral edge of the reference circle are locally reduced. The cross-sectional shape of the shaft hole through which the support shaft of the rotating body is inserted in the weight has an arcuate inner peripheral portion forming a part of the peripheral edge of the reference circle and the axial direction from both ends of the arcuate inner peripheral portion. It has a pair of groove defining portions that extend in the vertical direction to define the communication groove, and the communication groove is open on the outer peripheral surface of the weight, and the reduction portion of the support shaft is used as the groove defining portion of the shaft hole. By facing each other, the support shaft enters the communication groove so that the arc-shaped outer peripheral portion of the support shaft can come into surface contact with the arc-shaped inner peripheral portion of the shaft hole, thereby achieving the above-mentioned main technical problem. I found out what I could do.

即ち、本発明の第一の局面によれば、上記主たる技術的課題を達成する遠心ブレーキとして、断面円形の内周面を有する筒状のハウジングと、前記ハウジングの内側に配設される回転体とを具備し、前記回転体は前記ハウジングの前記内周面の中心軸を軸に回転可能であり、
前記回転体は前記中心軸に対して偏心して軸方向に延びる支持軸を有し、前記支持軸にはウェイトが旋回可能に軸支されており、
前記回転体が回転すると、前記ウェイトが前記支持軸を中心に旋回して前記ウェイトの外周面が前記ハウジングの前記内周面に当接する遠心ブレーキにおいて、
前記支持軸の断面形状は、基準円の周縁の一部をなす円弧状外周部と前記基準円の周縁の一部の径を局所的に低減させた低減部とを有し、
前記ウェイトにおいて前記支持軸が挿通される軸穴の断面形状は、前記基準円の周縁の一部をなす円弧状内周部と前記円弧状内周部の両端から軸方向に対して垂直方向に延出して連通溝を規定する一対の溝規定部とを有し、前記連通溝は前記ウェイトの外周面において開放されており、
前記支持軸の前記低減部を前記軸穴の前記溝規定部に対向させることで、前記支持軸は前記連通溝に進入して前記支持軸の前記円弧状外周部が前記軸穴の前記円弧状内周部と面接触可能となる、ことを特徴とする遠心ブレーキが提供される。 That is, according to the first aspect of the present invention, as a centrifugal brake that achieves the above-mentioned main technical problem, a cylindrical housing having an inner peripheral surface having a circular cross section and a rotating body disposed inside the housing. The rotating body can rotate about the central axis of the inner peripheral surface of the housing.
The rotating body has a support shaft that is eccentric with respect to the central axis and extends in the axial direction, and a weight is rotatably supported on the support shaft.
In a centrifugal brake in which when the rotating body rotates, the weight turns around the support shaft and the outer peripheral surface of the weight comes into contact with the inner peripheral surface of the housing.
The cross-sectional shape of the support shaft has an arcuate outer peripheral portion forming a part of the peripheral edge of the reference circle and a reduction portion in which the diameter of a part of the peripheral edge of the reference circle is locally reduced.
The cross-sectional shape of the shaft hole through which the support shaft is inserted in the weight is perpendicular to the axial direction from both ends of the arc-shaped inner peripheral portion forming a part of the peripheral edge of the reference circle and the arc-shaped inner peripheral portion. It has a pair of groove defining portions that extend and define the communication groove, and the communication groove is open on the outer peripheral surface of the weight.
By making the reduction portion of the support shaft face the groove defining portion of the shaft hole, the support shaft enters the communication groove and the arcuate outer peripheral portion of the support shaft has the arcuate shape of the shaft hole. Centrifugal brakes are provided that allow surface contact with the inner circumference.

好ましくは、前記低減部は前記基準円の直径方向両側において平行に直線状に延びる一対の平坦面である。前記連通溝の溝幅は前記ウェイトの外周面に向かって漸次増大せしめられるのが好適である。前記回転体は軸方向に間隔をおいて配置された２つの端板を備え、前記支持軸の両端が前記２つの端板に接続された状態で一体成形されるのがよい。好適には、前記支持軸には複数の前記ウェイトが軸方向に直列に軸支されていると共に、前記回転体には前記回転体に対する周方向への移動は阻止されるが軸方向への移動は許容される調整部材が接続されており、前記調整部材は前記ウェイトの外周面と前記ハウジングの前記内周面との間に選択的に進入可能である。この場合には、前記回転体と前記調整部材との間には、前記回転体に対する前記調整部材の軸方向位置を段階的に調整可能な軸方向係合機構が設けられているのが好ましい。好適には、前記回転体には増速機が接続されている。 Preferably, the reduction portion is a pair of flat surfaces extending linearly in parallel on both sides of the reference circle in the radial direction. It is preferable that the groove width of the communication groove is gradually increased toward the outer peripheral surface of the weight. The rotating body may include two end plates arranged at intervals in the axial direction, and may be integrally molded with both ends of the support shaft connected to the two end plates. Preferably, a plurality of the weights are axially supported in series on the support shaft, and the rotating body is prevented from moving in the circumferential direction with respect to the rotating body, but moves in the axial direction. Is connected to an acceptable adjusting member, which is selectively accessible between the outer peripheral surface of the weight and the inner peripheral surface of the housing. In this case, it is preferable that an axial engagement mechanism capable of stepwise adjusting the axial position of the adjusting member with respect to the rotating body is provided between the rotating body and the adjusting member. Preferably, a speed increaser is connected to the rotating body.

また、本発明の第二の局面によれば、断面円形の内周面を有する筒状のハウジングと、前記ハウジングの内側に配設される回転体とを具備し、前記回転体は前記ハウジングの前記内周面の中心軸を軸に回転可能であり、
前記回転体は前記中心軸に対して偏心して軸方向に延びる支持軸を有し、前記支持軸にはウェイトが旋回可能に軸支されており、
前記回転体が回転すると、前記ウェイトが前記支持軸を中心に旋回して前記ウェイトの外周面が前記ハウジングの前記内周面に当接する遠心ブレーキを製造する際の、前記支持軸への前記ウェイトの装着方法において、
前記支持軸の断面形状は、基準円の周縁の一部をなす円弧状外周部と前記基準円の周縁の一部の径を局所的に低減させた低減部とを有し、
前記ウェイトにおいて前記支持軸が挿通される軸穴の断面形状は、前記基準円の周縁の一部をなす円弧状内周部と前記円弧状内周部の両端から軸方向に対して垂直方向に延出して連通溝を規定する一対の溝規定部とを有し、前記連通溝は前記ウェイトの外周面において開放されており、
前記ウェイトは、前記支持軸が前記連通溝に進入して前記支持軸の前記円弧状外周部が前記軸穴の前記円弧状内周部と面接触した後に、前記支持軸に対して所定の方向に旋回させられる、ことを特徴とする装着方法が提供される。 Further, according to the second aspect of the present invention, a cylindrical housing having an inner peripheral surface having a circular cross section and a rotating body disposed inside the housing are provided, and the rotating body is the housing. It can rotate around the central axis of the inner peripheral surface.
The rotating body has a support shaft that is eccentric with respect to the central axis and extends in the axial direction, and a weight is rotatably supported on the support shaft.
When the rotating body rotates, the weight rotates about the support shaft, and the weight on the support shaft when the outer peripheral surface of the weight abuts on the inner peripheral surface of the housing is manufactured. In the mounting method of
The cross-sectional shape of the support shaft has an arcuate outer peripheral portion forming a part of the peripheral edge of the reference circle and a reduction portion in which the diameter of a part of the peripheral edge of the reference circle is locally reduced.
The cross-sectional shape of the shaft hole through which the support shaft is inserted in the weight is perpendicular to the axial direction from both ends of the arc-shaped inner peripheral portion forming a part of the peripheral edge of the reference circle and the arc-shaped inner peripheral portion. It has a pair of groove defining portions that extend and define the communication groove, and the communication groove is open on the outer peripheral surface of the weight.
The weight is in a predetermined direction with respect to the support shaft after the support shaft enters the communication groove and the arcuate outer peripheral portion of the support shaft comes into surface contact with the arcuate inner peripheral portion of the shaft hole. A mounting method is provided characterized by being swiveled in.

本発明の遠心ブレーキにあっては、ウェイトを旋回可能に軸支する支持軸の断面形状は、基準円の周縁の一部をなす円弧状外周部と上記基準円の周縁の一部の径を局所的に低減させた低減部とを有し、ウェイトにおいて回転体の支持軸が挿通される軸穴の断面形状は、上記基準円の周縁の一部をなす円弧状内周部とこの円弧状内周部の両端から軸方向に対して垂直方向に延出して連通溝を規定する一対の溝規定部とを有し、上記連通溝はウェイトの外周面において開放されており、支持軸の低減部を軸穴の溝規定部に対向させることで、支持軸は連通溝に進入して支持軸の円弧状外周部が軸穴の円弧状内周部と面接触可能であることから、ウェイトは、支持軸が連通溝に進入して支持軸の円弧状外周部が軸穴の円弧状内周部と面接触した後に、支持軸に対して所定の方向に旋回させられることで支持軸に装着される。それ故に、支持軸の両端が夫々端板に接続固定された状態で一体的に成形される構成であっても、ウェイトを支持軸に充分容易に装着することができる。 In the centrifugal brake of the present invention, the cross-sectional shape of the support shaft that pivotally supports the weight so as to be able to turn has the diameters of an arcuate outer peripheral portion forming a part of the peripheral edge of the reference circle and a part of the peripheral edge of the reference circle. The cross-sectional shape of the shaft hole, which has a locally reduced reduction portion and through which the support shaft of the rotating body is inserted in the weight, is an arc-shaped inner peripheral portion forming a part of the peripheral edge of the reference circle and this arc-shaped inner peripheral portion. It has a pair of groove defining portions that extend in the direction perpendicular to the axial direction from both ends of the inner peripheral portion and define the communication groove, and the communication groove is open on the outer peripheral surface of the weight to reduce the support shaft. By facing the portion to the groove defining portion of the shaft hole , the support shaft enters the communication groove and the arc-shaped outer peripheral portion of the support shaft can be in surface contact with the arc-shaped inner peripheral portion of the shaft hole. After the support shaft enters the communication groove and the arcuate outer peripheral portion of the support shaft comes into surface contact with the arcuate inner peripheral portion of the shaft hole, it is mounted on the support shaft by being swiveled in a predetermined direction with respect to the support shaft. Will be done. Therefore, the weight can be sufficiently easily attached to the support shaft even if the support shaft is integrally molded with both ends connected and fixed to the end plates.

本発明に従って構成された遠心ブレーキの全体構成を示す図。The figure which shows the whole structure of the centrifugal brake configured according to this invention. 図１に示す遠心ブレーキを構成部品毎に分解して示す斜視図。The perspective view which shows the centrifugal brake shown in FIG. 1 by disassembling each component. 図１に示す遠心ブレーキのハウジングを単体で示す図。The figure which shows the housing of the centrifugal brake shown in FIG. 1 by itself. 図１に示す遠心ブレーキの回転体を単体で示す図。The figure which shows the rotating body of the centrifugal brake shown in FIG. 1 by itself. 図１に示す遠心ブレーキのウェイトを単体で示す図。The figure which shows the weight of the centrifugal brake shown in FIG. 1 by itself. 図５に示すウェイトを回転体の支持軸に装着する工程を説明する図。It is a figure explaining the process of attaching the weight shown in FIG. 5 to the support shaft of a rotating body. 図１に示す遠心ブレーキの調整部材を単体で示す図。The figure which shows the adjustment member of the centrifugal brake shown in FIG. 1 by itself. 図１に示す遠心ブレーキの増速機の全体構成を示す図。The figure which shows the whole structure of the speed increaser of the centrifugal brake shown in FIG. 図１に示す遠心ブレーキの作動を説明するための図。The figure for demonstrating the operation of the centrifugal brake shown in FIG. 図１に示す遠心ブレーキの作動を説明するための図。The figure for demonstrating the operation of the centrifugal brake shown in FIG. 図１に示す遠心ブレーキの作動を説明するための図。The figure for demonstrating the operation of the centrifugal brake shown in FIG.

以下、本発明に従って構成された遠心ブレーキの好適実施形態を図示している添付図面を参照して、更に詳細に説明する。なお、以下の説明における「軸方向片側」及び「軸方向他側」とは、特に指定しない限り、図１のＡ－Ａ断面に示される状態を基準として、「軸方向片側」は同図において左側を、「軸方向他側」は同図において右側のことを言う。 Hereinafter, description will be made in more detail with reference to the accompanying drawings illustrating preferred embodiments of centrifugal brakes configured in accordance with the present invention. Unless otherwise specified, "one side in the axial direction" and "the other side in the axial direction" in the following description are referred to in the same figure as "one side in the axial direction" with reference to the state shown in the AA cross section of FIG. The left side and the "other side in the axial direction" refer to the right side in the figure.

図１及び図２を参照して説明すると、全体を番号２で示す遠心ブレーキは、筒状のハウジング４と回転体６とを具備している。 Explaining with reference to FIGS. 1 and 2, the centrifugal brake indicated by the number 2 as a whole includes a cylindrical housing 4 and a rotating body 6.

図１及び図２と共に図３を参照して説明すると、ハウジング４は比較的硬質の合成樹脂により成形された円筒形状であって軸方向に貫通しており、断面円形の内周面８を有している。内周面８の中心軸をｏで示す。ハウジング４の内周面８の軸方向片側端部には、径方向内側に向かって突出する円環形状の支持突条９が形成されている。また、図３と共に図２を参照することによって理解されるとおり、ハウジング４の外周面の軸方向片側端部には、直径方向の両側において軸方向片側に向かって直線状に延びる一対の延出片１０が形成されており、一対の延出片１０の各々の延出端部の外面には軸方向係止突起１２が形成されている。ハウジング４の外周面の軸方向片側端部には更に、直径方向の両側において径方向外方に突出する一対の耳部１４が形成されており、一対の耳部１４の各々には軸方向片側に向かって突出する断面円形の位置決めピン１６が形成されている。延出片１０及び位置決めピン１６は周方向に交互に９０度の角度間隔をおいて配置されている。かようなハウジング４は適宜の固定手段によって固定される。 Explaining with reference to FIG. 3 together with FIGS. 1 and 2, the housing 4 has a cylindrical shape formed of a relatively hard synthetic resin, penetrates in the axial direction, and has an inner peripheral surface 8 having a circular cross section. are doing. The central axis of the inner peripheral surface 8 is indicated by o. An annular support ridge 9 is formed at one end of the inner peripheral surface 8 of the housing 4 in the axial direction so as to project inward in the radial direction. Further, as will be understood by referring to FIG. 2 together with FIG. 3, a pair of extensions extending linearly toward one side in the axial direction on both sides in the radial direction are provided at one end in the axial direction of the outer peripheral surface of the housing 4. A piece 10 is formed, and an axial locking projection 12 is formed on the outer surface of each of the extending ends of the pair of extending pieces 10. Further, a pair of selvage portions 14 projecting outward in the radial direction are formed on both sides in the radial direction at one axial end portion of the outer peripheral surface of the housing 4, and each of the pair of selvage portions 14 is formed on one side in the axial direction. A positioning pin 16 having a circular cross section is formed so as to project toward. The extension piece 10 and the positioning pin 16 are arranged alternately in the circumferential direction at an angular interval of 90 degrees. Such a housing 4 is fixed by an appropriate fixing means.

図１に示すとおり、回転体６はハウジング４の内側に配設されて、中心軸ｏを軸に回転可能である。図１と共に図２及び図４を参照して説明すると、回転体６は合成樹脂製であって、中心軸ｏに対して偏心して軸方向に延びる支持軸１８を有する。図示の実施形態においては、支持軸１８は直径方向の両側に１つずつ設けられている。かような支持軸１８については後に更に言及する。図示の実施形態においては、回転体６は軸方向に間隔をおいて配置された２つの端板２０ａ及び２０ｂを備えており、支持軸１８の両端は２つの端板２０ａ及び２０ｂに接続されている。端板２０ａ及び２０ｂは共に円形であって中心軸ｏに対して実質上垂直に配置されており、端板２０ａ及び２０ｂの中心は共に中心軸ｏ上に位置する。端板２０ａ及び２０ｂは中心軸ｏに沿って軸方向に延びる接続円筒壁２２によっても接続されている。端板２０ａの軸方向片側面には中心軸ｏと共通の回転軸を有する太陽歯車２４が設けられている。図１のＡ－Ａ断面図に示されるとおり、端板２０ａの軸方向他側面の外周縁部はハウジング４の支持突条９の軸方向片側面と対向し、これにより回転体６がハウジング４に対して軸方向他側へ移動することは阻止される。一方、回転体６がハウジング４に対して軸方向片側へ移動することは、ハウジング４に固定される後述するシールド部材９０及びこれの内側に配置されるキャリア体７１によって阻止される。端板２０ｂの外周縁部には、周方向に延在する円弧状の切り欠き２６が周方向に等角度間隔をおいて４つ形成されており、周方向に隣接する２つの切り欠き２６の間には円弧状の係合突起２８が残留せしめられている。かような回転体６は射出成形により一体成形される。つまり、支持軸１８の両端は２つの端板２０ａ及び２０ｂに接続された状態、換言すれば両持ち梁状態で一体成形される。 As shown in FIG. 1, the rotating body 6 is arranged inside the housing 4 and can rotate about the central axis o. Explaining with reference to FIGS. 2 and 4 together with FIG. 1, the rotating body 6 is made of synthetic resin and has a support shaft 18 eccentric with respect to the central axis o and extending in the axial direction. In the illustrated embodiment, one support shaft 18 is provided on each side in the radial direction. Such a support shaft 18 will be further described later. In the illustrated embodiment, the rotating body 6 comprises two end plates 20a and 20b arranged axially spaced apart, and both ends of the support shaft 18 are connected to the two end plates 20a and 20b. There is. Both the end plates 20a and 20b are circular and are arranged substantially perpendicular to the central axis o, and the centers of the end plates 20a and 20b are both located on the central axis o. The end plates 20a and 20b are also connected by a connecting cylindrical wall 22 extending axially along the central axis o. A sun gear 24 having a rotation axis common to the central axis o is provided on one side surface of the end plate 20a in the axial direction. As shown in the cross-sectional view taken along the line AA of FIG. 1, the outer peripheral edge portion of the other side surface in the axial direction of the end plate 20a faces the one side surface in the axial direction of the support ridge 9 of the housing 4, whereby the rotating body 6 is housed 4. It is prevented from moving to the other side in the axial direction. On the other hand, the rotation of the rotating body 6 to one side in the axial direction with respect to the housing 4 is prevented by the shield member 90, which will be described later, fixed to the housing 4, and the carrier body 71 arranged inside the shield member 90, which will be described later. On the outer peripheral edge of the end plate 20b, four arcuate notches 26 extending in the circumferential direction are formed at equal intervals in the circumferential direction, and the two notches 26 adjacent in the circumferential direction are formed. An arc-shaped engaging protrusion 28 is left between them. Such a rotating body 6 is integrally molded by injection molding. That is, both ends of the support shaft 18 are integrally molded in a state of being connected to the two end plates 20a and 20b, in other words, in a state of a double-sided beam.

図１の断面図に示すとおり、回転体６の支持軸１８にはウェイト３０（３０ａ乃至３０ｃ）が軸支されている。図示の実施形態においては、２つの支持軸１８の各々に３つのウェイト３０が軸方向に直列に軸支されている。以下の説明において軸方向に直列に配置された３つずつのウェイト３０の夫々について言及する際には、軸方向片側から軸方向他側に向かってａ乃至ｃを付して言及する。図１と共に図２及び図５を参照して説明を続けると、図示の実施形態においては、ウェイト３０は金属製の主部３２と、比較的軟質の合成樹脂からなる摺動片３４とから構成されている。主部３２は平面視において周方向に１８０度よりも幾分小さい角度範囲に亘って延在する円弧形状であって、所要軸方向幅を備えている。主部３２の外周面の所要部位には軸方向に延びる装着溝３８が形成されており、この装着溝３８に摺動片３４が適宜の固定方法によって交換可能に装着される。主部３２の外周面の軸方向片側端部には、外径を幾分低減させることによって形成される段部４０が周方向に連続して設けられている。摺動片３４は断面が略矩形で軸方向に直線状に延在している。 As shown in the cross-sectional view of FIG. 1, a weight 30 (30a to 30c) is pivotally supported on the support shaft 18 of the rotating body 6. In the illustrated embodiment, three weights 30 are axially supported in series on each of the two support shafts 18. In the following description, when referring to each of the three weights 30 arranged in series in the axial direction, a to c are added from one side in the axial direction to the other side in the axial direction. Continuing the description with reference to FIGS. 2 and 5 together with FIG. 1, in the illustrated embodiment, the weight 30 is composed of a main portion 32 made of metal and a sliding piece 34 made of a relatively soft synthetic resin. Has been done. The main portion 32 has an arc shape extending over an angle range somewhat smaller than 180 degrees in the circumferential direction in a plan view, and has a required axial width. A mounting groove 38 extending in the axial direction is formed at a required portion on the outer peripheral surface of the main portion 32, and the sliding piece 34 is replaceably mounted in the mounting groove 38 by an appropriate fixing method. At one end of the outer peripheral surface of the main portion 32 in the axial direction, stepped portions 40 formed by reducing the outer diameter to some extent are continuously provided in the circumferential direction. The sliding piece 34 has a substantially rectangular cross section and extends linearly in the axial direction.

ここで、図４のＸ部拡大図を参照して説明すると、本発明に従って構成された遠心ブレーキにあっては、回転体６の支持軸１８の断面形状は、一点鎖線で示す基準円４２の周縁の一部をなす円弧状外周部１８ａと基準円４２の周縁の一部の径を局所的に低減させた低減部１８ｂとを有する。図示の実施形態においては、円弧状外周部１８ａ及び低減部１８ｂは共に基準円４２の直径方向両側に一対ずつ設けられており、円弧状外周部１８ａと低減部１８ｂは周方向に交互に位置する。円弧状外周部１８ａ及び低減部１８ｂは夫々一つずつ設けられていてもよい。円弧状外周部１８ａは周方向に１８０度の角度範囲を超えて延在する。円弧状外周部１８ａは９０度乃至１５０度の角度範囲に亘って延在するのがよく、図示の実施形態においては、一対の円弧状外周部１８ａの各々は周方向に略１２０度ずつ併せて略２４０度の角度範囲に亘って延在している。図示の実施形態においては、一対の低減部１８ｂの各々は相互に平行な平坦面であって、基準円４２の中心４４からの距離は等しい。図４のＢ－Ｂ断面図も参照することによって理解されるとおり、平坦面である一対の低減部１８ｂの各々は同図において時計方向に向かって径方向内側に幾分傾斜している。 Here, to explain with reference to the enlarged view of the X portion of FIG. 4, in the centrifugal brake configured according to the present invention, the cross-sectional shape of the support shaft 18 of the rotating body 6 is the reference circle 42 shown by the alternate long and short dash line. It has an arc-shaped outer peripheral portion 18a forming a part of the peripheral edge and a reduction portion 18b in which the diameter of a part of the peripheral edge of the reference circle 42 is locally reduced. In the illustrated embodiment, the arcuate outer peripheral portion 18a and the reduction portion 18b are both provided in pairs on both sides of the reference circle 42 in the diametrical direction, and the arcuate outer peripheral portion 18a and the reduction portion 18b are alternately located in the circumferential direction. .. The arc-shaped outer peripheral portion 18a and the reduction portion 18b may be provided one by one. The arcuate outer peripheral portion 18a extends beyond an angle range of 180 degrees in the circumferential direction. The arcuate outer peripheral portion 18a preferably extends over an angle range of 90 to 150 degrees, and in the illustrated embodiment, each of the pair of arcuate outer peripheral portions 18a is combined by approximately 120 degrees in the circumferential direction. It extends over an angle range of approximately 240 degrees. In the illustrated embodiment, each of the pair of reduction portions 18b is a flat surface parallel to each other, and the distances from the center 44 of the reference circle 42 are equal. As can be seen by also referring to the cross-sectional view taken along the line BB in FIG. 4, each of the pair of reduction portions 18b, which are flat surfaces, is slightly inclined inward in the clockwise direction in the same figure.

次に、図５（ａ）左図を参照して説明すると、ウェイト３０の主部３２には支持軸１８が挿通される軸穴４６が形成されている。軸穴４６の断面形状は、基準円４２の周縁の一部をなす円弧状内周部４６ａとこの円弧状内周部４６ａの両端から軸方向に対して垂直方向に延出する一対の溝規定部４６ｂとを有しており、一対の溝規定部４６ｂはウェイト３０の外周面において開放される連通溝４８を規定している。円弧状内周部４６ａは周方向に１８０度の角度範囲を超えて延在する。円弧状内周部４６ａは２０５度乃至２６５度の角度範囲に亘って延在するのがよく、図示の実施形態においては略２３５度の角度範囲に亘って延在している。連通溝４８の溝幅Ｄは支持軸１８において基準円４２の中心４４を通過する最小径ｄ（図４のＸ部拡大図も参照されたい）と対応し、支持軸１８の低減部１８ｂを連通溝４８に整合、即ち低減部１８ｂを溝規定部４６ｂに対向させることで、支持軸１８は連通溝４８に進入して支持軸１８の円弧状外周部１８ａが軸穴４６の円弧状内周部４６ａと面接触可能となる。図示の実施形態においては、一対の溝規定部４６ｂの各々は円弧状内周部４６ａの両端から軸方向に対して垂直方向に相互に離隔して延出しており、これにより連通溝４８の溝幅Ｄはウェイト３０の外周面に向かって漸次増大せしめられている。そして、溝幅Ｄの最小値はｄと同一若しくはこれよりも僅かに大きく設定されている。 Next, to explain with reference to the left figure of FIG. 5A, a shaft hole 46 through which the support shaft 18 is inserted is formed in the main portion 32 of the weight 30. The cross-sectional shape of the shaft hole 46 is defined as a pair of grooves extending in a direction perpendicular to the axial direction from both ends of the arc-shaped inner peripheral portion 46a forming a part of the peripheral edge of the reference circle 42 and the arc-shaped inner peripheral portion 46a. It has a portion 46b, and the pair of groove defining portions 46b define a communication groove 48 that is opened on the outer peripheral surface of the weight 30. The arc-shaped inner peripheral portion 46a extends beyond an angle range of 180 degrees in the circumferential direction. The arcuate inner peripheral portion 46a preferably extends over an angle range of 205 to 265 degrees, and in the illustrated embodiment, extends over an angle range of approximately 235 degrees. The groove width D of the communication groove 48 corresponds to the minimum diameter d of the support shaft 18 passing through the center 44 of the reference circle 42 (see also the enlarged view of the X portion in FIG. 4), and communicates with the reduction portion 18b of the support shaft 18. By aligning with the groove 48, that is, by making the reduction portion 18b face the groove defining portion 46b, the support shaft 18 enters the communication groove 48, and the arcuate outer peripheral portion 18a of the support shaft 18 becomes the arcuate inner peripheral portion of the shaft hole 46. Surface contact with 46a is possible. In the illustrated embodiment, each of the pair of groove defining portions 46b extends from both ends of the arcuate inner peripheral portion 46a so as to be separated from each other in the direction perpendicular to the axial direction, whereby the groove of the communication groove 48 is formed. The width D is gradually increased toward the outer peripheral surface of the weight 30. The minimum value of the groove width D is set to be the same as or slightly larger than d.

本発明に従って構成された遠心ブレーキでは、回転体６の支持軸１８及びウェイト３０が上述したとおりの構成であることから、図６に示すとおり、支持軸１８の低減部１８ｂが軸穴４６の溝規定部４６ｂに対向するように配置した後に支持軸１８に対してウェイト３０を移動させることで支持軸１８は連通溝４８に進入し（同図（ａ））、支持軸１８の円弧状外周部１８ａは軸穴４６の円弧状内周部４６ａに面接触する（同図（ｂ））。しかる後に支持軸１８を旋回中心としてウェイト３０を中心軸ｏに向かってつまり同図において時計方向に旋回せしめる（同図（ｃ））。支持軸１８の円弧状外周部１８ａ及び軸穴４６の円弧状内周部４６ａはいずれも共通の基準円４２の周縁の一部であることから、ウェイト３０は支持軸１８を旋回中心として旋回可能である。かくしてウェイト３０は支持軸１８に装着される。ここで、図６（ｂ）に示す状態における支持軸１８に対するウェイト３０の旋回角度は、後に言及するウェイト３０の外周面がハウジング４の内周面８と当接する旋回角度よりも大きい。ここでいう「旋回角度」は、回転体６が回転していない状態つまり図１のＣ－Ｃ断面乃至Ｅ－Ｅ断面に示される状態を基準とする。従って、ウェイト３０は支持軸１８に対し、ウェイト３０の外周面がハウジング４の内周面８と当接する旋回角度よりも大きい旋回角度で支持軸１８に装着される。換言すれば、ウェイト３０は、（ウェイト３０の）外周面がハウジング４の内周面８と当接するときよりも、（ウェイト３０の）内周面が回転体６の中心軸ｏから離隔した状態で支持軸１８に装着される。ウェイト３０が支持軸１８に装着された後に、回転体６及びウェイト３０はハウジング４と組み合わされる。 In the centrifugal brake configured according to the present invention, since the support shaft 18 and the weight 30 of the rotating body 6 have the same configuration as described above, as shown in FIG. 6, the reduction portion 18b of the support shaft 18 is a groove of the shaft hole 46. By moving the weight 30 with respect to the support shaft 18 after arranging the support shaft 18 so as to face the specified portion 46b, the support shaft 18 enters the communication groove 48 ((a) in the figure), and the arcuate outer peripheral portion of the support shaft 18 is formed. 18a is in surface contact with the arcuate inner peripheral portion 46a of the shaft hole 46 (FIG. (B)). After that, the weight 30 is swiveled toward the central axis o with the support shaft 18 as the turning center, that is, swiveled clockwise in the figure (FIG. (C)). Since the arc-shaped outer peripheral portion 18a of the support shaft 18 and the arc-shaped inner peripheral portion 46a of the shaft hole 46 are both part of the peripheral edge of the common reference circle 42, the weight 30 can turn around the support shaft 18 as the turning center. Is. Thus, the weight 30 is mounted on the support shaft 18. Here, the turning angle of the weight 30 with respect to the support shaft 18 in the state shown in FIG. 6B is larger than the turning angle at which the outer peripheral surface of the weight 30, which will be described later, abuts on the inner peripheral surface 8 of the housing 4. The "turning angle" referred to here is based on the state in which the rotating body 6 is not rotating, that is, the state shown in the CC cross section to the EE cross section of FIG. Therefore, the weight 30 is mounted on the support shaft 18 at a turning angle larger than the turning angle at which the outer peripheral surface of the weight 30 abuts on the inner peripheral surface 8 of the housing 4 with respect to the support shaft 18. In other words, the weight 30 is in a state where the inner peripheral surface (of the weight 30) is separated from the central axis o of the rotating body 6 than when the outer peripheral surface (of the weight 30) is in contact with the inner peripheral surface 8 of the housing 4. Is attached to the support shaft 18. After the weight 30 is mounted on the support shaft 18, the rotating body 6 and the weight 30 are combined with the housing 4.

従って、本発明に従って構成された遠心ブレーキにあっては、ウェイト３０は、これを軸支する回転体６の支持軸１８が連通溝４８に進入して支持軸１８の円弧状外周部１８ａが軸穴４６の円弧状内周部４６ａと面接触した後に、支持軸１８に対して所定の方向に旋回させられることで支持軸１８に装着される。それ故に、支持軸１８の両端が夫々端板２０ａ及び２０ｂに接続固定された状態で一体的に成形される構成であっても、ウェイト３０を支持軸１８に充分容易に装着することができる。図示の実施形態においては、連通溝４８の溝幅Ｄが軸穴４６から開放端に向かって漸次増大せしめられているため、支持軸１８を連通溝４８に容易に案内することができる。 Therefore, in the centrifugal brake configured according to the present invention, the weight 30 has the support shaft 18 of the rotating body 6 that pivotally supports the weight 30 and enters the communication groove 48, and the arcuate outer peripheral portion 18a of the support shaft 18 is the shaft. After surface contact with the arcuate inner peripheral portion 46a of the hole 46, it is mounted on the support shaft 18 by being swiveled in a predetermined direction with respect to the support shaft 18. Therefore, the weight 30 can be sufficiently easily attached to the support shaft 18 even if both ends of the support shaft 18 are integrally molded while being connected and fixed to the end plates 20a and 20b, respectively. In the illustrated embodiment, since the groove width D of the communication groove 48 is gradually increased from the shaft hole 46 toward the open end, the support shaft 18 can be easily guided to the communication groove 48.

再び図１を参照して説明すると、回転体６には調整部材５２が接続されている。図１と共に図２及び図７を参照して説明すると、調整部材５２は合成樹脂製であって全体的に円筒形状である。調整部材５２は、軸方向他側端部に位置して径方向肉厚が比較的厚い把手部５４と、把手部５４以外の部分であって径方向肉厚が比較的薄い作用部５６とに区画される。把手部５４の外周面には周方向に等角度間隔をおいて複数個（図示の実施形態においては６個）の軸方向に延びる凹溝５８が形成されている。把手部５４の径方向肉厚が比較的厚く従って把手部５４の剛性が比較的高いこと、及び把手部５４には凹溝５８が形成されていることに起因して、後述するとおり使用者は把手部５４を容易に把手できる。図７の上段右側面図に示されるとおり、把手部５４には肉抜き穴６０も適宜形成されている。作用部５６には径方向に貫通して軸方向に直線状に延びる係合溝６２が１８０度の角度間隔をおいて２つ形成されている。係合溝６２の溝幅は回転体６の端板２０ｂに形成された係合突起２８の周方向幅よりも僅かに大きく、係合突起２８が係合溝６２に嵌り込んでこれと周方向に係合することで調整部材５２は回転体６と一体となって回転可能となる。換言すれば、係合溝６２と係合突起２８との係合により回転体６に対する調整部材５２の周方向への移動は阻止される。作用部５６には更に径方向に貫通して軸方向に直線状に延びる補助溝６４も１８０度の角度間隔をおいて２つ形成されている。補助溝６４の溝幅は係合突起２８の周方向幅よりも僅かに小さく（従って係合溝６２の溝幅よりも僅かに小さく）、補助溝６４及び係合溝６２は周方向に９０度の角度間隔をおいて交互に配置されている。補助溝６４の軸方向所要位置には、溝幅が周方向両側に局所的に幾分増大せしめられた３つの係合穴６６ａ乃至６６ｃが形成されている。３つの係合穴６６ａ乃至６６ｃの軸方向位置は３個のウェイト３０ａ乃至３０ｃの軸方向位置と対応する。係合穴６６ａ乃至６６ｃの周方向幅は係合突起２８の周方向幅よりも僅かに大きく、係合溝６２に嵌り込んでいない係合突起２８が係合穴６６ａ乃至６６ｃに嵌り込むことで調整部材５２は回転体６と軸方向に係合し、回転体６に対する調整部材５２の軸方向への移動は阻止される。このことから、係合突起２８及び係合穴６６ａ乃至６６ｃは、回転体６に対する調整部材５２の軸方向位置を段階的に調整することのできる軸方向係合機構を構成する。 To explain again with reference to FIG. 1, the adjusting member 52 is connected to the rotating body 6. Explaining with reference to FIGS. 2 and 7 together with FIG. 1, the adjusting member 52 is made of synthetic resin and has a cylindrical shape as a whole. The adjusting member 52 includes a handle portion 54 having a relatively thick radial wall thickness located at the other end in the axial direction, and an acting portion 56 having a portion other than the handle portion 54 having a relatively thin radial wall thickness. It is partitioned. A plurality of (six in the illustrated embodiment) concave grooves 58 extending in the axial direction are formed on the outer peripheral surface of the handle portion 54 at equal angular intervals in the circumferential direction. As described later, the user can use the handle portion 54 because the radial wall thickness of the handle portion 54 is relatively thick and therefore the rigidity of the handle portion 54 is relatively high, and the concave groove 58 is formed in the handle portion 54. The handle portion 54 can be easily handled. As shown in the upper right side view of FIG. 7, a lightening hole 60 is appropriately formed in the handle portion 54. The working portion 56 is formed with two engaging grooves 62 penetrating in the radial direction and extending linearly in the axial direction at an angle interval of 180 degrees. The groove width of the engaging groove 62 is slightly larger than the circumferential width of the engaging protrusion 28 formed on the end plate 20b of the rotating body 6, and the engaging protrusion 28 fits into the engaging groove 62 in the circumferential direction. The adjusting member 52 can rotate integrally with the rotating body 6 by engaging with the rotating body 6. In other words, the engagement between the engaging groove 62 and the engaging projection 28 prevents the adjusting member 52 from moving in the circumferential direction with respect to the rotating body 6. Two auxiliary grooves 64, which penetrate the working portion 56 in the radial direction and extend linearly in the axial direction, are also formed at an angle interval of 180 degrees. The groove width of the auxiliary groove 64 is slightly smaller than the circumferential width of the engaging protrusion 28 (hence slightly smaller than the groove width of the engaging groove 62), and the auxiliary groove 64 and the engaging groove 62 are 90 degrees in the circumferential direction. They are arranged alternately with an angular interval of. At the required position in the axial direction of the auxiliary groove 64, three engagement holes 66a to 66c in which the groove width is locally slightly increased on both sides in the circumferential direction are formed. The axial positions of the three engaging holes 66a to 66c correspond to the axial positions of the three weights 30a to 30c. The circumferential width of the engaging holes 66a to 66c is slightly larger than the circumferential width of the engaging protrusion 28, and the engaging protrusion 28 not fitted in the engaging groove 62 fits into the engaging holes 66a to 66c. The adjusting member 52 engages with the rotating body 6 in the axial direction, and the axial movement of the adjusting member 52 with respect to the rotating body 6 is prevented. From this, the engaging protrusion 28 and the engaging holes 66a to 66c form an axial engaging mechanism capable of stepwise adjusting the axial position of the adjusting member 52 with respect to the rotating body 6.

図１に示すとおり、回転体６には更に増速機６８も接続されている。図１と共に図２及び図８を参照して説明すると、増速機６８は遊星歯車機構であって、これは回転体６に形成されている太陽歯車２４、太陽歯車２４と噛み合う遊星歯車７０、遊星歯車７０を回転可能に軸支すると共に自身も中心軸ｏを中心として回転可能なキャリア体７１、及び遊星歯車７０と噛み合う固定リング歯車７２を含む。図示の実施形態においては、３個の遊星歯車７０がキャリア体７１によって軸支されている。キャリア体７１は中心軸ｏに対して垂直に配置される円形のキャリア板７６と、キャリア板７６から軸方向に延出して遊星歯車７０を軸支する３つのキャリア軸７８と、周方向に隣接する２つのキャリア軸７８の間に夫々設けられて軸方向に直線状に延出する３つの接続柱８０とを備え、３つのキャリア軸７８の夫々が遊星歯車７０を軸支した状態で、遊星歯車７０を挟んでキャリア板７６とは軸方向の反対側に配置されるキャリア補助板８２と組み合わされる。キャリア板７６及びキャリア補助板８２によって遊星歯車７０は軸方向の両側から保持される。キャリア補助板８２にはキャリア軸７８の先端部が挿入される丸穴８４及び接続柱８０の先端部が挿入される円弧穴８６が夫々形成されており、キャリア補助板８２はキャリア体７１と一体となって中心軸ｏの周りを自転する。キャリア板７６の中央には軸方向に貫通する正６角形の接続穴８８が形成されており、この接続穴８８に例えばブラインドの巻き取り機構の回転軸（図９－１乃至図９－３において二点鎖線で示す）が挿通されて回転が伝達される。 As shown in FIG. 1, a speed increasing machine 68 is also connected to the rotating body 6. Explaining with reference to FIGS. 2 and 8 together with FIG. 1, the speed increaser 68 is a planetary gear mechanism, which is a sun gear 24 formed on the rotating body 6, a planetary gear 70 that meshes with the sun gear 24, and It includes a carrier body 71 that rotatably supports the planetary gear 70 and is also rotatable about the central axis o, and a fixed ring gear 72 that meshes with the planetary gear 70. In the illustrated embodiment, the three planetary gears 70 are pivotally supported by the carrier body 71. The carrier body 71 is adjacent to a circular carrier plate 76 arranged perpendicular to the central axis o, and three carrier shafts 78 extending axially from the carrier plate 76 to support the planetary gear 70 in the circumferential direction. It is provided with three connecting columns 80 which are provided between the two carrier shafts 78 and extend linearly in the axial direction, and the planetary gears 70 are supported by each of the three carrier shafts 78. It is combined with a carrier auxiliary plate 82 arranged on the opposite side in the axial direction from the carrier plate 76 with the gear 70 interposed therebetween. The planetary gear 70 is held from both sides in the axial direction by the carrier plate 76 and the carrier auxiliary plate 82. The carrier auxiliary plate 82 is formed with a round hole 84 into which the tip of the carrier shaft 78 is inserted and an arc hole 86 into which the tip of the connecting pillar 80 is inserted, and the carrier auxiliary plate 82 is integrated with the carrier body 71. It rotates around the central axis o. A regular hexagonal connecting hole 88 penetrating in the axial direction is formed in the center of the carrier plate 76, and in this connecting hole 88, for example, a rotating shaft of a blind winding mechanism (in FIGS. 9-1 to 9-3). (Indicated by a two-dot chain line) is inserted to transmit rotation.

固定リング歯車７２はハウジング４の軸方向片側に直列に配置されてこれに固定されるシールド部材９０の内周面に形成されている。シールド部材９０は略正方形のシールド端板９２を有している。シールド端板９２の中央部の軸方向他側面には円形の凹所９４が形成されており、この凹所９４にはキャリア体７１が中心軸ｏの周りを自転可能な状態で嵌め合わされる。シールド端板９２の中央には軸方向に貫通する円形の貫通穴９６も形成されており、この貫通穴９６を通って上述した回転軸はキャリア板７６の接続穴８８に挿通される。シールド端板９２の軸方向他側面には、凹所９４の外周縁を囲繞して軸方向他側に向かって軸方向に延びるシールド筒壁９８が設けられており、固定リング歯車７２はシールド筒壁９８の内周面に形成されている。シールド筒壁９８を軸方向他側から見たとき、つまり図８（ａ）左図において直径方向の両側に位置する一方の一対の角部はシールド端板９２の角部と整合し、かかる一対の角部には夫々、ハウジング４に形成された位置決めピン１６が挿入される位置決め穴１００が形成されている。一方、直径方向の両側に位置する他方の一対の角部はシールド端板９２の角部よりも径方向内側に偏倚されてその外周面は円弧形状にせしめられており、円弧形状にせしめられた外周面には夫々軸方向に延びる一対の支持突条１０２が周方向に間隔をおいて形成されている。一対の支持突条１０２の各々の間の周方向角度領域のシールド端板９２には、円弧形状にせしめられたシールド筒壁９８の外周面に沿って軸方向に貫通する円弧穴１０４が形成されており、円弧穴１０４の軸方向他側端部にはハウジング４に形成された軸方向係止突起１２と係止可能な軸方向被係止突起１０６が形成されている。従って、シールド部材９０は、位置決めピン１６と位置決め穴１００との協働及び軸方向係止突起１２と軸方向被係止突起１０６との協働によってハウジング４に固定される。 The fixed ring gear 72 is formed on the inner peripheral surface of the shield member 90 arranged in series on one side in the axial direction of the housing 4 and fixed to the fixed ring gear 72. The shield member 90 has a substantially square shield end plate 92. A circular recess 94 is formed on the other side surface of the central portion of the shield end plate 92 in the axial direction, and the carrier body 71 is fitted into the recess 94 in a state in which the carrier body 71 can rotate around the central axis o. A circular through hole 96 penetrating in the axial direction is also formed in the center of the shield end plate 92, and the above-mentioned rotating shaft is inserted into the connection hole 88 of the carrier plate 76 through the through hole 96. On the other side surface of the shield end plate 92 in the axial direction, a shield cylinder wall 98 that surrounds the outer peripheral edge of the recess 94 and extends axially toward the other side in the axial direction is provided, and the fixed ring gear 72 is a shield cylinder. It is formed on the inner peripheral surface of the wall 98. When the shield cylinder wall 98 is viewed from the other side in the axial direction, that is, one pair of corners located on both sides in the radial direction in FIG. 8A is aligned with the corners of the shield end plate 92, and such a pair. Positioning holes 100 into which the positioning pins 16 formed in the housing 4 are inserted are formed in the corners of the housing 4. On the other hand, the other pair of corners located on both sides in the radial direction are biased inward in the radial direction from the corners of the shield end plate 92, and the outer peripheral surface thereof is formed into an arc shape, and is formed into an arc shape. A pair of support ridges 102 extending in the axial direction are formed on the outer peripheral surface at intervals in the circumferential direction. In the shield end plate 92 in the circumferential angle region between each of the pair of support ridges 102, an arc hole 104 is formed so as to penetrate axially along the outer peripheral surface of the shield cylinder wall 98 formed in an arc shape. An axial locking projection 12 formed on the housing 4 and an axially locked projection 106 that can be locked are formed at the other end of the arc hole 104 in the axial direction. Therefore, the shield member 90 is fixed to the housing 4 by the cooperation between the positioning pin 16 and the positioning hole 100 and the cooperation between the axial locking projection 12 and the axially locked projection 106.

図示の実施形態においては、太陽歯車２４の歯数は１８、これと噛み合う遊星歯車７０の歯数は１２、これと噛み合う固定リング歯車７２の歯数は４２であって、キャリア体７１が入力部材に、太陽歯車２４が出力部材に相当することから、以下の数式より、キャリア体７１の回転は１０／３倍に増速されて太陽歯車２４に伝達される。なお、各歯車の歯数を変更すれば増速比を任意に調整することができることは多言を要さない。

Figure 0007052122000002
但し、
Ｚｓ：太陽歯車の歯数、Ｚｒ：リング歯車の歯数、
ｎｓ：太陽歯車の回転数、ｎｒ：リング歯車の回転数、ｎｃ：キャリア体の回転数 In the illustrated embodiment, the number of teeth of the sun gear 24 is 18, the number of teeth of the planetary gear 70 that meshes with the sun gear 24 is 12, the number of teeth of the fixed ring gear 72 that meshes with the sun gear 24 is 42, and the carrier body 71 is an input member. Since the sun gear 24 corresponds to the output member, the rotation of the carrier body 71 is accelerated by 10/3 times and transmitted to the sun gear 24 according to the following formula. It is not necessary to say that the speed increase ratio can be arbitrarily adjusted by changing the number of teeth of each gear.
Figure 0007052122000002
 however,
Zs: Number of teeth of sun gear, Zr: Number of teeth of ring gear,
ns: rotation speed of sun gear, nr: rotation speed of ring gear, nc: rotation speed of carrier body

次に、図１と共に図９－１乃至図９―３を参照して、本発明に従って構成された遠心ブレーキ２の作動について説明する。
図１には、回転体６の端板２０ｂに形成された係合突起２８が調整部材５２に形成された３つの係合穴６６ａ乃至６６ｃのうち最も軸方向他側に位置する係合穴６６ａに係合され、調整部材５２の作用部５６は３段のウェイト３０ａ乃至３０ｃのうち軸方向他側に位置する２段のウェイト３０ｂ及び３０ｃとハウジング４の内周面８との間に進入している状態が示されている。図１に示す状態では、回転体６は回転しておらず、ウェイト３０ａ乃至３０ｃの外周面はハウジング４の内周面８から離隔している。 Next, the operation of the centrifugal brake 2 configured according to the present invention will be described with reference to FIGS. 9-1 to 9-3 together with FIG.
In FIG. 1, the engaging protrusion 28 formed on the end plate 20b of the rotating body 6 is located on the other side in the axial direction among the three engaging holes 66a to 66c formed on the adjusting member 52. The acting portion 56 of the adjusting member 52 enters between the two-stage weights 30b and 30c located on the other side in the axial direction of the three-stage weights 30a to 30c and the inner peripheral surface 8 of the housing 4. The state is shown. In the state shown in FIG. 1, the rotating body 6 is not rotating, and the outer peripheral surfaces of the weights 30a to 30c are separated from the inner peripheral surface 8 of the housing 4.

図１に示す状態から増速機６８のキャリア体７１に接続された回転軸が回転すると、キャリア体７１の回転は増速して回転体６に伝達される。このとき、回転体６が反時計方向（Ａ－Ａ断面の右方向から見て）に回転すると、回転体６と共に調整部材５２がこれと一体となって回転し、支持軸１８によって支持された全てのウェイト３０ａ乃至３０ｃは遠心力によって支持軸１８を軸として径方向外方に旋回しようとする。然しながら、ウェイト３０ｂ及び３０ｃとハウジング４の内周面８との間には調整部材５２さらに詳しくはその作用部５６が進入していることから、ウェイト３０ｂ及び３０ｃが上記遠心力によって支持軸１８を軸として径方向外方に旋回することは阻止され、図９－１に示すとおり、ハウジング４の内周面８との間に調整部材５２が進入していないウェイト３０ａのみが上記遠心力によって支持軸１８を軸として径方向外方に旋回する。ウェイト３０ａが旋回するとこれに装着された摺動片３４がハウジング４の内周面８と当接し、摺動片３４がハウジング４の内周面８に対して摺動する。これにより、回転体６にはウェイト３０の摺動片３４とハウジング４の内周面８との間の摩擦によるブレーキ（制動トルク）が作用する。図示の実施形態においては、ハウジング４は比較的硬質の合成樹脂製であると共にウェイト３０の摺動片３４は比較的軟質の合成樹脂製であることから、交換可能な摺動片３４のみが偏摩耗してハウジング４の内周面が摩耗することは防止される。 When the rotation shaft connected to the carrier body 71 of the speed increaser 68 rotates from the state shown in FIG. 1, the rotation of the carrier body 71 is accelerated and transmitted to the rotating body 6. At this time, when the rotating body 6 rotates in the counterclockwise direction (when viewed from the right side of the AA cross section), the adjusting member 52 rotates together with the rotating body 6 and is supported by the support shaft 18. All the weights 30a to 30c try to rotate outward in the radial direction about the support shaft 18 by centrifugal force. However, since the adjusting member 52, more specifically, the acting portion 56 thereof has entered between the weights 30b and 30c and the inner peripheral surface 8 of the housing 4, the weights 30b and 30c support the support shaft 18 by the centrifugal force. It is prevented from turning outward in the radial direction as an axis, and as shown in FIG. 9-1, only the weight 30a in which the adjusting member 52 does not enter between the inner peripheral surface 8 of the housing 4 is supported by the centrifugal force. It turns outward in the radial direction with the shaft 18 as the axis. When the weight 30a turns, the sliding piece 34 attached to the weight 30a comes into contact with the inner peripheral surface 8 of the housing 4, and the sliding piece 34 slides with respect to the inner peripheral surface 8 of the housing 4. As a result, a brake (braking torque) due to friction between the sliding piece 34 of the weight 30 and the inner peripheral surface 8 of the housing 4 acts on the rotating body 6. In the illustrated embodiment, since the housing 4 is made of a relatively hard synthetic resin and the sliding piece 34 of the weight 30 is made of a relatively soft synthetic resin, only the replaceable sliding piece 34 is biased. It is prevented that the inner peripheral surface of the housing 4 is worn due to wear.

図示の実施形態においては、調整部材５２を回転体６に対して軸方向に移動させることで、回転体６が回転した際にハウジング４の内周面８に当接するウェイト３０の数を増減することができ、これにより上記制動トルクの大きさを段階的に調整することが可能である。調整部材５２を軸方向に移動させるには、調整部材５２の把手部５４を把手して行う。 In the illustrated embodiment, by moving the adjusting member 52 in the axial direction with respect to the rotating body 6, the number of weights 30 that abut on the inner peripheral surface 8 of the housing 4 when the rotating body 6 rotates is increased or decreased. This makes it possible to adjust the magnitude of the braking torque step by step. In order to move the adjusting member 52 in the axial direction, the handle portion 54 of the adjusting member 52 is handled.

回転体６が回転した際にこれに作用する制動トルクの大きさを図９－１に示された状態よりも大きくするには、回転体６に対して調整部材５２を軸方向他側に移動させて、支持軸１８を軸として径方向外方に旋回可能なウェイト３０の数を増やす。図９－２に示すとおり、回転体６の端板２０ｂに形成された係合突起２８が調整部材５２に形成された３つの係合穴６６ａ乃至６６ｃのうち軸方向中間に位置する係合穴６６ｂに係合されれば、調整部材５２の作用部５６は３段のウェイト３０ａ乃至３０ｃのうち軸方向他側に位置する１段のウェイト３０ｃとハウジング４の内周面８との間にのみ進入し、上記遠心力によってウェイト３０ａと共にウェイト３０ｂも支持軸１８を軸として径方向外方に旋回可能となり、回転体６にかかる制動トルクは増大される。図９－３に示すとおり、回転体６の端板２０ｂに形成された係合突起２８が調整部材５２に形成された３つの係合穴６６ａ乃至６６ｃのうち軸方向片側に位置する係合穴６６ｃに係合されれば、調整部材５２の作用部５６はウェイト３０とハウジング４の内周面８との間から完全に退去し、上記遠心力によってウェイト３０ａ及びウェイト３０ｂと共にウェイト３０ｃも支持軸１８を軸として径方向外方に旋回可能となり、回転体６にかかる制動トルクはより一層増大される。 In order to make the magnitude of the braking torque acting on the rotating body 6 when it rotates larger than the state shown in FIG. 9-1, the adjusting member 52 is moved to the other side in the axial direction with respect to the rotating body 6. The number of weights 30 that can be turned outward in the radial direction with the support shaft 18 as an axis is increased. As shown in FIG. 9-2, the engaging protrusion 28 formed on the end plate 20b of the rotating body 6 is an engaging hole located in the middle in the axial direction among the three engaging holes 66a to 66c formed on the adjusting member 52. When engaged with 66b, the acting portion 56 of the adjusting member 52 is placed only between the one-stage weight 30c located on the other side in the axial direction of the three-stage weights 30a to 30c and the inner peripheral surface 8 of the housing 4. Upon entering, the weight 30a and the weight 30b can turn outward in the radial direction around the support shaft 18 due to the centrifugal force, and the braking torque applied to the rotating body 6 is increased. As shown in FIG. 9-3, the engaging protrusion 28 formed on the end plate 20b of the rotating body 6 is an engaging hole located on one side in the axial direction among the three engaging holes 66a to 66c formed on the adjusting member 52. When engaged with 66c, the acting portion 56 of the adjusting member 52 completely retracts from between the weight 30 and the inner peripheral surface 8 of the housing 4, and the weight 30a and the weight 30b as well as the weight 30c are supported by the centrifugal force. It becomes possible to turn outward in the radial direction with 18 as an axis, and the braking torque applied to the rotating body 6 is further increased.

以上、本発明に従って構成された遠心ブレーキについて添付した図面を参照して詳述したが、本発明は上述した実施形態に限定されるものではなく、本発明を逸脱しない範囲内において適宜の修正や変更が可能である。例えば、図示の実施形態においては、２つの支持軸１８の各々にウェイト３０は軸方向に直列に３つずつ設けられていたが、支持軸１８及びウェイト３０の数は適宜変更することができる。また、図示の実施形態においては、回転体６が反時計方向（図９－１のＡ－Ａ断面の右方向から見て）に回転した際にウェイト３０が支持軸１８を軸として径方向外方に旋回したが、ウェイト３０が表裏反転した状態で支持軸１８にされれば、回転体が反対方向つまり時計方向に回転した際にウェイトが支持軸１８を軸として径方向外方に旋回するようになる。更に、図示の実施形態においては、同一段における２つのウェイトは中心軸ｏを中心として点対称に配置されているが、同一段における２つのウェイトを直径方向に対して線対称に配置すれば、回転体が正逆いずれの方向に回転した場合であっても回転体に制動トルクを作用させることができる。この場合には、回転体の回転方向に応じて上記２つのウェイトのいずれか一方のみがハウジングの内周面に対して摺動する。更に、必要な制動トルクが小さい場合には、ウェイトを合成樹脂により成形することも可能であり、この場合には、ウェイトを上述した摺動片と同じ合成樹脂で成形し、ウェイトの主部と摺動片を一体成形することもあり得る。 Although the centrifugal brake configured according to the present invention has been described in detail with reference to the attached drawings, the present invention is not limited to the above-described embodiment, and appropriate modifications and modifications may be made without departing from the present invention. It can be changed. For example, in the illustrated embodiment, three weights 30 are provided in series in the axial direction on each of the two support shafts 18, but the number of the support shafts 18 and the weights 30 can be appropriately changed. Further, in the illustrated embodiment, when the rotating body 6 rotates in the counterclockwise direction (viewed from the right side of the AA cross section of FIG. 9-1), the weight 30 is out of the radial direction with the support shaft 18 as the axis. However, if the weight 30 is turned upside down and turned into the support shaft 18, the weight turns outward in the radial direction with the support shaft 18 as the axis when the rotating body rotates in the opposite direction, that is, in the clockwise direction. Will be. Further, in the illustrated embodiment, the two weights in the same stage are arranged point-symmetrically with respect to the central axis o, but if the two weights in the same stage are arranged line-symmetrically with respect to the radial direction, A braking torque can be applied to the rotating body regardless of whether the rotating body rotates in the forward or reverse direction. In this case, only one of the above two weights slides with respect to the inner peripheral surface of the housing depending on the rotation direction of the rotating body. Further, when the required braking torque is small, the weight can be formed of synthetic resin. In this case, the weight is formed of the same synthetic resin as the above-mentioned sliding piece, and the weight is formed with the main part of the weight. It is also possible that the sliding pieces are integrally molded.

２：遠心ブレーキ
４：ハウジング
６：回転体
８：（ハウジングの）内周面
１８：支持軸
１８ａ：（支持軸の）円弧状外周部
１８ｂ：（支持軸の）低減部
２０ａ及び２０ｂ：端板
３０（３０ａ乃至３０ｃ）：ウェイト
４２：基準円
４６：軸穴
４６ａ：（軸穴の）円弧状内周部
４６ｂ：（軸穴の）溝規定部
４８：連通溝
５２：調整部材 2: Centrifugal brake 4: Housing 6: Rotating body 8: Inner peripheral surface (of housing) 18: Support shaft 18a: Arc-shaped outer peripheral part (of support shaft) 18b: Reduction part (of support shaft) 20a and 20b: End plate 30 (30a to 30c): Weight 42: Reference circle 46: Shaft hole 46a: Arc-shaped inner peripheral part (of shaft hole) 46b: Groove regulation part (of shaft hole) 48: Communication groove 52: Adjusting member

Claims (8)

断面円形の内周面を有する筒状のハウジングと、前記ハウジングの内側に配設される回転体とを具備し、前記回転体は前記ハウジングの前記内周面の中心軸を軸に回転可能であり、
前記回転体は前記中心軸に対して偏心して軸方向に延びる支持軸を有し、前記支持軸にはウェイトが旋回可能に軸支されており、
前記回転体が回転すると、前記ウェイトが前記支持軸を中心に旋回して前記ウェイトの外周面が前記ハウジングの前記内周面に当接する遠心ブレーキにおいて、
前記支持軸の断面形状は、基準円の周縁の一部をなす円弧状外周部と前記基準円の周縁の一部の径を局所的に低減させた低減部とを有し、
前記ウェイトにおいて前記支持軸が挿通される軸穴の断面形状は、前記基準円の周縁の一部をなす円弧状内周部と前記円弧状内周部の両端から軸方向に対して垂直方向に延出して連通溝を規定する一対の溝規定部とを有し、前記連通溝は前記ウェイトの外周面において開放されており、
前記支持軸の前記低減部を前記軸穴の前記溝規定部に対向させることで、前記支持軸は前記連通溝に進入して前記支持軸の前記円弧状外周部が前記軸穴の前記円弧状内周部と面接触可能となる、ことを特徴とする遠心ブレーキ。 A cylindrical housing having an inner peripheral surface having a circular cross section and a rotating body disposed inside the housing are provided, and the rotating body can rotate about the central axis of the inner peripheral surface of the housing. can be,
The rotating body has a support shaft that is eccentric with respect to the central axis and extends in the axial direction, and a weight is rotatably supported on the support shaft.
In a centrifugal brake in which when the rotating body rotates, the weight turns around the support shaft and the outer peripheral surface of the weight comes into contact with the inner peripheral surface of the housing.
The cross-sectional shape of the support shaft has an arcuate outer peripheral portion forming a part of the peripheral edge of the reference circle and a reduction portion in which the diameter of a part of the peripheral edge of the reference circle is locally reduced.
The cross-sectional shape of the shaft hole through which the support shaft is inserted in the weight is perpendicular to the axial direction from both ends of the arc-shaped inner peripheral portion forming a part of the peripheral edge of the reference circle and the arc-shaped inner peripheral portion. It has a pair of groove defining portions that extend and define the communication groove, and the communication groove is open on the outer peripheral surface of the weight.
By making the reduction portion of the support shaft face the groove defining portion of the shaft hole, the support shaft enters the communication groove and the arcuate outer peripheral portion of the support shaft has the arcuate shape of the shaft hole. A centrifugal brake that allows surface contact with the inner circumference. 前記低減部は前記基準円の直径方向両側において平行に直線状に延びる一対の平坦面である、請求項１に記載の遠心ブレーキ。 The centrifugal brake according to claim 1, wherein the reduction portion is a pair of flat surfaces extending linearly in parallel on both sides of the reference circle in the radial direction. 前記連通溝の溝幅は前記ウェイトの外周面に向かって漸次増大せしめられる、請求項１又は２に記載の遠心ブレーキ。 The centrifugal brake according to claim 1 or 2, wherein the groove width of the communication groove is gradually increased toward the outer peripheral surface of the weight. 前記回転体は軸方向に間隔をおいて配置された２つの端板を備え、前記支持軸の両端が前記２つの端板に接続された状態で一体成形される、請求項１乃至３のいずれかに記載の遠心ブレーキ。 Any of claims 1 to 3, wherein the rotating body includes two end plates arranged at intervals in the axial direction, and is integrally molded with both ends of the support shaft connected to the two end plates. Centrifugal brake described in Crab. 前記支持軸には複数の前記ウェイトが軸方向に直列に軸支されていると共に、前記回転体には前記回転体に対する周方向への移動は阻止されるが軸方向への移動は許容される調整部材が接続されており、前記調整部材は前記ウェイトの外周面と前記ハウジングの前記内周面との間に選択的に進入可能である、請求項１乃至４のいずれかに記載の遠心ブレーキ。 A plurality of the weights are axially supported in series on the support shaft, and the rotating body is prevented from moving in the circumferential direction with respect to the rotating body, but is allowed to move in the axial direction. The centrifugal brake according to any one of claims 1 to 4, wherein an adjusting member is connected, and the adjusting member can selectively enter between the outer peripheral surface of the weight and the inner peripheral surface of the housing. .. 前記回転体と前記調整部材との間には、前記回転体に対する前記調整部材の軸方向位置を段階的に調整可能な軸方向係合機構が設けられている、請求項５に記載の遠心ブレーキ。 The centrifugal brake according to claim 5, wherein an axial engagement mechanism capable of stepwise adjusting the axial position of the adjusting member with respect to the rotating body is provided between the rotating body and the adjusting member. .. 前記回転体には増速機が接続されている、請求項１乃至６のいずれかに記載の遠心ブレーキ。 The centrifugal brake according to any one of claims 1 to 6, wherein a speed increaser is connected to the rotating body. 断面円形の内周面を有する筒状のハウジングと、前記ハウジングの内側に配設される回転体とを具備し、前記回転体は前記ハウジングの前記内周面の中心軸を軸に回転可能であり、
前記回転体は前記中心軸に対して偏心して軸方向に延びる支持軸を有し、前記支持軸にはウェイトが旋回可能に軸支されており、
前記回転体が回転すると、前記ウェイトが前記支持軸を中心に旋回して前記ウェイトの外周面が前記ハウジングの前記内周面に当接する遠心ブレーキを製造する際の、前記支持軸への前記ウェイトの装着方法において、
前記支持軸の断面形状は、基準円の周縁の一部をなす円弧状外周部と前記基準円の周縁の一部の径を局所的に低減させた低減部とを有し、
前記ウェイトにおいて前記支持軸が挿通される軸穴の断面形状は、前記基準円の周縁の一部をなす円弧状内周部と前記円弧状内周部の両端から軸方向に対して垂直方向に延出して連通溝を規定する一対の溝規定部とを有し、前記連通溝は前記ウェイトの外周面において開放されており、
前記ウェイトは、前記支持軸が前記連通溝に進入して前記支持軸の前記円弧状外周部が前記軸穴の前記円弧状内周部と面接触した後に、前記支持軸に対して所定の方向に旋回させられる、ことを特徴とする装着方法。 A cylindrical housing having an inner peripheral surface having a circular cross section and a rotating body disposed inside the housing are provided, and the rotating body can rotate about the central axis of the inner peripheral surface of the housing. can be,
The rotating body has a support shaft that is eccentric with respect to the central axis and extends in the axial direction, and a weight is rotatably supported on the support shaft.
When the rotating body rotates, the weight rotates about the support shaft, and the weight on the support shaft when the outer peripheral surface of the weight abuts on the inner peripheral surface of the housing is manufactured. In the mounting method of
The cross-sectional shape of the support shaft has an arcuate outer peripheral portion forming a part of the peripheral edge of the reference circle and a reduction portion in which the diameter of a part of the peripheral edge of the reference circle is locally reduced.
The cross-sectional shape of the shaft hole through which the support shaft is inserted in the weight is perpendicular to the axial direction from both ends of the arc-shaped inner peripheral portion forming a part of the peripheral edge of the reference circle and the arc-shaped inner peripheral portion. It has a pair of groove defining portions that extend and define the communication groove, and the communication groove is open on the outer peripheral surface of the weight.
The weight is in a predetermined direction with respect to the support shaft after the support shaft enters the communication groove and the arcuate outer peripheral portion of the support shaft comes into surface contact with the arcuate inner peripheral portion of the shaft hole. A mounting method characterized by being swiveled to.
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JPS475612A (en) * 1971-08-23 1972-02-24
JPH10122274A (en) * 1996-10-15 1998-05-12 Tsunesaburo Uchida Centrifugal internal expanding brake
JP2012148849A (en) * 2011-01-18 2012-08-09 Asahi Kinzoku Seisakusho:Kk Brake roller for conveyor
US20160319598A1 (en) * 2015-04-30 2016-11-03 Johnson Electric S.A. Drive actuator

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Publication number Priority date Publication date Assignee Title
JP4994778B2 (en) * 2006-10-13 2012-08-08 トーソー株式会社 Reduction device for solar radiation shielding member
JP6345517B2 (en) * 2014-07-04 2018-06-20 立川ブラインド工業株式会社 Braking device, shielding device
JP6779427B2 (en) * 2014-10-30 2020-11-04 株式会社ニックス Centrifugal braking device and manual propulsion vehicle equipped with it
JP6956476B2 (en) * 2016-05-19 2021-11-02 立川ブラインド工業株式会社 Braking device and shielding device using it

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JPS475612A (en) * 1971-08-23 1972-02-24
JPH10122274A (en) * 1996-10-15 1998-05-12 Tsunesaburo Uchida Centrifugal internal expanding brake
JP2012148849A (en) * 2011-01-18 2012-08-09 Asahi Kinzoku Seisakusho:Kk Brake roller for conveyor
US20160319598A1 (en) * 2015-04-30 2016-11-03 Johnson Electric S.A. Drive actuator

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