JP2004239406A - Clutch device - Google Patents

Clutch device Download PDF

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Publication number
JP2004239406A
JP2004239406A JP2003031510A JP2003031510A JP2004239406A JP 2004239406 A JP2004239406 A JP 2004239406A JP 2003031510 A JP2003031510 A JP 2003031510A JP 2003031510 A JP2003031510 A JP 2003031510A JP 2004239406 A JP2004239406 A JP 2004239406A
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JP
Japan
Prior art keywords
clutch
control member
friction surface
friction
rotating shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003031510A
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Japanese (ja)
Inventor
Masahiro Inoue
昌弘 井上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koyo Seiko Co Ltd
Original Assignee
Koyo Seiko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP2003031510A priority Critical patent/JP2004239406A/en
Publication of JP2004239406A publication Critical patent/JP2004239406A/en
Pending legal-status Critical Current

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  • Mechanical Operated Clutches (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To realize the simplification in a constitution of a clutch device 1, which switches a connection state to transmit rotational power between a first rotating shaft 2 and a second rotating shaft 3 and a disconnection state not to transmit it, and the cost reduction. <P>SOLUTION: Centrifugal friction members 10, 11, which are operated corresponding to the magnitude of centrifugal force, are made to automatically execute the operation of whether rotational resistance is imparted to a control member 4 or not in order to switch the connection state and the disconnection state. By this, the constitution can be made simpler compared with the conventional electromagnetic brake, and at the same time, a device and power for controlling operations of the electromagnetic brake are not required. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、クラッチ装置に関する。
【0002】
【従来の技術】
本願出願人は、構成簡素なクラッチ装置を提案している(特許文献1参照)。
【0003】
このクラッチ装置は、第1回転軸と、その内周に転がり軸受を介して相対回転可能に挿通される第2回転軸と、前記第1回転軸の内周に対して前記第2回転軸と同一軸線上に向き合う状態で挿通配置される制御軸と、前記制御軸が回転抵抗を受けないときに前記第1回転軸と第2回転軸との間で回転動力を伝達しない切断状態とする一方で制御軸が回転抵抗を受けたときに第1回転軸と第2回転軸との間で回転動力を伝達する接続状態にするクラッチ作用部とを有する。なお、制御軸に対して回転抵抗を付与するものとして、電磁ブレーキを用いている。
【0004】
【特許文献1】
特開2002−213500号公報
【0005】
【発明が解決しようとする課題】
本願出願人は、上記クラッチ装置の開発を進めている過程で、さらなる構成簡素化と低コスト化を図ることを見出した。
【0006】
【課題を解決するための手段】
本発明のクラッチ装置は、第1回転軸と第2回転軸との間で回転動力を伝達する接続状態や伝達しない切断状態に切り換えるもので、前記第1回転軸に対して軸方向に不動で相対回転可能に支持される制御部材と、前記第1回転軸に設けられる摩擦面と、前記第2回転軸の外周に対して周方向に不動で軸方向に変位可能に嵌合されかつ前記第1回転軸の摩擦面に対して接触・離隔される摩擦面を有するクラッチ体と、前記クラッチ体の摩擦面を前記第1回転軸の摩擦面に対して押し付ける向きに常時付勢する付勢部材と、所定以上の遠心力を受けたときのみ前記制御部材に対して回転抵抗を付与する遠心摩擦部材と、前記遠心摩擦部材で前記制御部材に回転抵抗を付与していないときに、前記クラッチ体の摩擦面を前記第1回転軸の摩擦面に対して圧接させて前記接続状態とする一方で、前記遠心摩擦部材で前記制御部材に回転抵抗を付与したときに、前記クラッチ体の摩擦面を前記第1回転軸の摩擦面から離隔させて前記切断状態とするカム機構とを含む。
【0007】
この構成では、制御部材に対して回転抵抗を付与するかしないかを、所定回転数を超えたときに遠心力で動作する遠心摩擦部材で自動的に行うようにしている。これにより、従来例のような電磁ブレーキと異なり、構成が簡素で済むとともに、電磁ブレーキの動作を制御するための装置や電力が不要となる。
【0008】
ところで、上記カム機構は、前記制御部材および前記クラッチ体において互いに軸方向で対向する面の円周数ヶ所に設けられかつ少なくとも周方向一方へ向けて溝深さが漸次浅く設定されるカム溝と、両カム溝間に周方向転動可能に介装されるクラッチ用玉とを含み、前記クラッチ用玉が前記両カム溝の深い部分に位置したときに、前記クラッチ体を前記制御部材側へ近づけて前記両摩擦面を圧接させる一方で、前記クラッチ用玉が前記両カム溝の浅い部分に位置したときに、前記クラッチ体を前記制御部材から遠ざけて前記両摩擦面を離隔させるようにすることができる。
【0009】
この場合、接続状態や切断状態を維持しやすくなり、動作が安定する。
【0010】
【発明の実施の形態】
図1から図7に本発明の一実施形態を示している。図例のクラッチ装置1は、同心に配置される第1回転軸2と第2回転軸3との間で回転動力を伝達するクラッチ接続状態と遮断するクラッチ切断状態とに切り換えるものである。
【0011】
第1回転軸2は、円筒形に形成されており、第2回転軸3は、円柱形に形成されている。第1回転軸2の内周に第2回転軸3の一端側(図の左側)が同心状に挿入されている。
【0012】
上記第1回転軸2の内周面において軸方向途中から一方軸端(図の右側)までの領域には、外側へ向けて拡径するテーパコーン形状の摩擦面2aが設けられている。また、第1回転軸2の内周面において円筒形の領域には、深溝型玉軸受などの転がり軸受20を介して制御部材4が軸方向に不動で相対回転可能に挿入されている。
【0013】
一方、第2回転軸3の外周面において軸方向中間領域には、スプライン歯3aが形成されており、このスプライン歯3aには、クラッチ体5がスプライン嵌合されることにより周方向に不動で軸方向に変位可能に取り付けられている。このクラッチ体5は、第1回転軸2の内周において摩擦面2aの存在する範囲内に配置されている。
【0014】
上記制御部材4は、円筒部4aの一端側に径方向外向きに延びる鍔部4bを設けた形状である。この制御部材4の円筒部4a内周に対して第2回転軸3の一方軸端が相対回転可能に嵌入支持されているとともに、C形リング21を介して軸方向に位置決めされている。
【0015】
上記クラッチ体5は、環状板からなり、その外周には、第1回転軸2の摩擦面2aに対して合致するテーパコーン形状の摩擦面5aが設けられている。このクラッチ体5は、第1回転軸2の摩擦面2aの内周において制御部材4の鍔部4bと軸方向で対向する状態で配置されている。
【0016】
このクラッチ体5と、第2回転軸3のスプライン歯3aの軸方向途中に係合された止め輪22との間には、クラッチ体5を制御部材4側へ常時弾発付勢する付勢部材としての円錐コイルバネ7が介装されている。
【0017】
上記制御部材4の鍔部4bとクラッチ体5との各対向面の円周数ヶ所には、一対となるカム溝4c,5bが設けられており、両カム溝4c,5bの間にクラッチ用玉6が介装されている。カム溝4c,5bは、それぞれ、周方向に沿う長溝形状に形成されており、その周方向中央から周方向両側へ向けて漸次浅くなるすり鉢形状になっている。
【0018】
上記制御部材4のカム溝4c、クラッチ体5のカム溝5b、クラッチ用玉6がカム機構を構成している。つまり、このカム機構は、制御部材4とクラッチ体5との相対回転に伴い両カム溝4c,5b間においてクラッチ用玉6が周方向に転動してクラッチ体5を制御部材4に対して近接・離隔させるよう動作する。
【0019】
上記制御部材4の円筒部4aの外側には、遠心摩擦部材としての二つの半円筒形のブレーキシュー10,11が円筒形となるように配置されている。これらブレーキシュー10,11の各一端は、制御部材4の円筒部4a外端面に対してピン12a,12bを介して揺動可能に支持されており、また、ブレーキシュー10,11の各他端には、引っ張りばね13が互いを近接させるように取り付けられている。
【0020】
このブレーキシュー10,11の外径側には、円筒形の固定環体8が配置されている。
【0021】
なお、ブレーキシュー10,11の外径部分には、固定環体8の内周面に対して当接される凸部10a,11aが設けられている。なお、この凸部10a,11aは、ブレーキシュー10,11において引っ張りばね13寄りに設けられており、この配置により、固定環体8に対して大きな摩擦力を付与できるようになる。
【0022】
次に、動作について説明する。ここでは、図示しないモータの回転動力を第1回転軸2に入力させて、制御部材4の回転速度に応じて第1回転軸2に入力される回転動力を第2回転軸3に対して伝達または遮断するようにしている。つまり、第1回転軸2を回転動力の入力側とし、第2回転軸3を出力側とする。
【0023】
まず、第1回転軸2が非回転の状態では、クラッチ体5が円錐コイルバネ7の弾発付勢力によって制御部材4側に近づけられているとともに、図6に示すように、クラッチ用玉6が両カム溝4c,5bの深い部分に位置しており、これによってクラッチ体5の摩擦面5aが第1回転軸2の摩擦面2aに対して圧接されている。このとき、ブレーキシュー10,11に対して遠心力が作用していないので、引っ張りばね13の引っ張り弾力でもってブレーキシュー10,11が径方向内向きに閉じられていて、その凸部10a,11aが固定環体8の内周面から離れている。このため、第1回転軸2と第2回転軸3と制御部材4が一体化して同期回転する状態、つまり第1回転軸2から第2回転軸3へ回転動力を伝達できる接続状態になっている。
【0024】
ここで、第1回転軸2に回転動力を入力することにより、第2回転軸3の回転速度が所定の回転速度を越えるまでは、上記接続状態を維持するが、前記所定の回転速度を越えると、ブレーキシュー10,11に作用する遠心力が、引っ張りばね13の引っ張り弾力に打ち勝つことになって、ブレーキシュー10,11が径方向外向きに開いてその凸部10a,11aが固定環体8の内周面に対して圧接されることになる。その摩擦トルクにより制御部材4の回転速度がクラッチ体5および第2回転軸3よりも遅くなるので、制御部材4のカム溝4cとクラッチ体5のカム溝5bとが周方向一方へずれて、図7に示すように、クラッチ用玉6が両カム溝4c,5bの浅い部分に位置するとともに、クラッチ体5が円錐コイルバネ7の弾発付勢力に抗して制御部材4から遠ざかる向きに移動させられて、クラッチ体5の摩擦面5aが第1回転軸2の摩擦面2aから離隔される。そのため、第1回転軸2に対して第2回転軸3が相対回転する状態、つまり第1回転軸2から第2回転軸3に対して回転動力を伝達しない切断状態になる。
【0025】
このように切断状態になると、第2回転軸3および制御部材4の回転数が下がるが、この回転速度が所定未満に下がって、ブレーキシュー10,11に作用する遠心力よりも引っ張りばね13の引っ張り弾力が勝ると、ブレーキシュー10,11が径方向内向きに閉じてその凸部10a,11aが固定環体8の内周面から離れるので、制御部材4の回転抵抗が激減する。この一方で、第2回転軸3が回転動力を伝達する相手部材から回転抵抗を受けているので、制御部材4の回転速度が第2回転軸3およびクラッチ体5の回転速度よりも遅くなって、クラッチ用玉6が両カム溝4c,5bの深い部分に位置するとともに、円錐コイルバネ7の弾発付勢力によりクラッチ体5が制御部材4側へ近づく向きに変位して、クラッチ体5の摩擦面5aが第1回転軸2の摩擦面2aに対して圧接されることになる。このため、第1回転軸2に対して第2回転軸3および制御部材4が一体化して同期回転する状態、つまり第1回転軸2から第2回転軸3に対して回転動力を伝達する接続状態になる。
【0026】
なお、上記とは逆に、第2回転軸3を入力側として、第1回転軸2を出力側としても上記同様に接続状態と切断状態とに切り換えることができる。
【0027】
以上説明したように、上記クラッチ装置1は、接続状態と切断状態との切り換えを、遠心力で動作するブレーキシュー10,11で自動的に行うようにしているから、従来例の電磁ブレーキよりも遥かに簡素な構成であるとともに、電磁ブレーキの動作を制御するための装置や前記動作制御のための電力が不要となるなど、イニシャルコストならびにランニングコストの低減に貢献できる。
【0028】
また、上記実施形態のように、接続状態においてブレーキシュー10,11による摩擦トルクが制御部材4に対して作用させないようにしていれば、動力伝達ロスがなく、効率的である。
【0029】
なお、本発明は、上述した実施形態のみに限定されるものではなく、種々な応用や変形が可能である。
【0030】
(1)上述したクラッチ装置1は、例えば自動車のエンジンとモータの2種の動力源を有するハイブリッドカーにおいて、自動車の走行速度が一定の速度に到達するまでの間において上記エンジン動力で前輪を駆動させるとともに上記モータ動力で後輪を駆動させる四輪駆動形態とし、自動車の走行速度が一定の速度を越えた場合に、後輪へのモータ動力の伝達を遮断して前二輪駆動形態とするために利用することができる。
【0031】
(2)上記実施形態のカム溝4c,5bについては、周方向一方へのみ漸次浅くした形状にすることができる。この場合、一対のカム溝4c,5bは、互いに周方向逆向きに配置する必要がある。このような構成では、入力軸となる第1回転軸2をいずれか一方のみに回転駆動させる必要がある。
【0032】
(3)上記実施形態において、クラッチ装置1の円錐コイルバネ7は、皿ばねや円筒コイルバネなどを用いても同様に実施できる。
【0033】
【発明の効果】
本発明では、第1回転軸と第2回転軸との間で回転動力を伝達させる接続状態と伝達しない切断状態との切り換えについて、遠心力に応じて動作する遠心摩擦部材で自動的に行わせるようにしており、構成簡素化ならびに低コスト化が可能になる。
【図面の簡単な説明】
【図1】本発明の一実施形態に係るクラッチ装置の接続状態を示す断面図
【図2】図1のクラッチ装置の切断状態を示す断面図
【図3】図1の(3)−(3)線断面の矢視図
【図4】図2の(4)−(4)線断面の矢視図
【図5】図1のクラッチ装置の分解斜視図
【図6】図1のカム機構の接続状態を示す要部拡大図
【図7】図2のカム機構の切断状態を示す要部拡大図
【符号の説明】
1 クラッチ装置
2 第1回転軸
3 第2回転軸
3a 第2回転軸の摩擦面
4 制御部材
4c 制御部材のカム溝
5 クラッチ体
5a クラッチ体の摩擦面
5b クラッチ体のカム溝
6 クラッチ用玉
7 円錐コイルバネ
8 固定環体
10,11 ブレーキシュー
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a clutch device.
[0002]
[Prior art]
The present applicant has proposed a clutch device having a simple configuration (see Patent Document 1).
[0003]
The clutch device includes a first rotating shaft, a second rotating shaft inserted into the inner periphery of the first rotating shaft so as to be relatively rotatable via a rolling bearing, and the second rotating shaft with respect to the inner periphery of the first rotating shaft. A control shaft that is inserted and disposed so as to face the same axis, and a cutting state in which rotational power is not transmitted between the first rotary shaft and the second rotary shaft when the control shaft does not receive rotational resistance. And a clutch operating portion for establishing a connection state for transmitting rotational power between the first rotating shaft and the second rotating shaft when the control shaft receives rotational resistance. Note that an electromagnetic brake is used to impart rotational resistance to the control shaft.
[0004]
[Patent Document 1]
JP-A-2002-213500
[Problems to be solved by the invention]
In the process of developing the clutch device, the applicant of the present application has found that the structure is further simplified and the cost is reduced.
[0006]
[Means for Solving the Problems]
The clutch device of the present invention switches between a connected state in which rotational power is transmitted between the first rotating shaft and the second rotating shaft and a disconnected state in which the rotating power is not transmitted, and is stationary in the axial direction with respect to the first rotating shaft. A control member supported to be relatively rotatable, a friction surface provided on the first rotation shaft, fitted to the outer periphery of the second rotation shaft so as to be circumferentially immovable and axially displaceable; A clutch body having a friction surface that is brought into contact with and separated from a friction surface of one rotation shaft; and a biasing member that constantly biases the friction surface of the clutch body in a direction of pressing the friction surface against the friction surface of the first rotation shaft. A centrifugal friction member that applies rotational resistance to the control member only when receiving a centrifugal force equal to or more than a predetermined value; and the clutch body when the centrifugal friction member does not apply rotational resistance to the control member. To the friction surface of the first rotating shaft While pressing and contacting the connection state, when the centrifugal friction member imparts rotational resistance to the control member, the friction surface of the clutch body is separated from the friction surface of the first rotation shaft. And a cam mechanism for setting a cutting state.
[0007]
In this configuration, whether or not rotational resistance is applied to the control member is automatically determined by a centrifugal friction member that operates with a centrifugal force when a predetermined rotation speed is exceeded. Thus, unlike the conventional electromagnetic brake, the configuration can be simplified, and a device and electric power for controlling the operation of the electromagnetic brake are not required.
[0008]
By the way, the cam mechanism is provided at several circumferential positions on the surfaces of the control member and the clutch body that face each other in the axial direction, and the groove depth is set to be gradually smaller at least in one circumferential direction. And a clutch ball interposed between the two cam grooves so as to be capable of rolling in the circumferential direction. When the clutch ball is located in a deep portion of the two cam grooves, the clutch body is moved toward the control member. The two friction surfaces are brought into close contact with each other, and when the clutch ball is located in a shallow portion of the two cam grooves, the clutch body is moved away from the control member to separate the two friction surfaces. be able to.
[0009]
In this case, the connected state and the disconnected state are easily maintained, and the operation is stabilized.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 7 show an embodiment of the present invention. The illustrated clutch device 1 switches between a clutch engaged state for transmitting rotational power between a first rotating shaft 2 and a second rotating shaft 3 disposed concentrically, and a clutch disengaged state for disconnecting.
[0011]
The first rotating shaft 2 is formed in a cylindrical shape, and the second rotating shaft 3 is formed in a cylindrical shape. One end side (left side in the figure) of the second rotating shaft 3 is concentrically inserted into the inner periphery of the first rotating shaft 2.
[0012]
A tapered cone-shaped friction surface 2a whose diameter increases outward is provided in a region from the middle in the axial direction to one shaft end (right side in the drawing) on the inner peripheral surface of the first rotary shaft 2. The control member 4 is inserted in a cylindrical region on the inner peripheral surface of the first rotating shaft 2 via a rolling bearing 20 such as a deep groove ball bearing so as to be relatively stationary in the axial direction and relatively rotatable.
[0013]
On the other hand, spline teeth 3a are formed in the axially intermediate region on the outer peripheral surface of the second rotary shaft 3, and the spline teeth 3a are immovable in the circumferential direction by the clutch body 5 being spline-fitted. It is mounted so that it can be displaced in the axial direction. The clutch body 5 is arranged in the inner circumference of the first rotating shaft 2 within a range where the friction surface 2a exists.
[0014]
The control member 4 has a shape in which a flange 4b extending radially outward is provided on one end side of the cylindrical portion 4a. One end of the second rotating shaft 3 is rotatably fitted and supported on the inner periphery of the cylindrical portion 4 a of the control member 4, and is positioned in the axial direction via a C-shaped ring 21.
[0015]
The clutch body 5 is formed of an annular plate, and a tapered cone-shaped friction surface 5a that matches the friction surface 2a of the first rotating shaft 2 is provided on the outer periphery thereof. The clutch body 5 is disposed on the inner periphery of the friction surface 2a of the first rotating shaft 2 so as to face the flange 4b of the control member 4 in the axial direction.
[0016]
Between the clutch body 5 and the retaining ring 22 engaged halfway in the axial direction of the spline teeth 3a of the second rotating shaft 3, an urging force for constantly urging the clutch body 5 toward the control member 4 is provided. A conical coil spring 7 as a member is interposed.
[0017]
A pair of cam grooves 4c and 5b are provided at several places on the circumference of each of the opposing surfaces of the flange 4b of the control member 4 and the clutch body 5, and a pair of cam grooves 4c and 5b is provided between the two cam grooves 4c and 5b. Ball 6 is interposed. Each of the cam grooves 4c and 5b is formed in a long groove shape along the circumferential direction, and has a mortar shape that gradually becomes shallower from the center in the circumferential direction toward both sides in the circumferential direction.
[0018]
The cam groove 4c of the control member 4, the cam groove 5b of the clutch body 5, and the clutch ball 6 constitute a cam mechanism. In other words, in this cam mechanism, the clutch ball 6 rolls in the circumferential direction between the two cam grooves 4c and 5b with the relative rotation of the control member 4 and the clutch body 5 to move the clutch body 5 with respect to the control member 4. It operates to approach and separate.
[0019]
Outside the cylindrical portion 4a of the control member 4, two semi-cylindrical brake shoes 10, 11 as centrifugal friction members are arranged so as to be cylindrical. One end of each of the brake shoes 10, 11 is swingably supported on the outer end surface of the cylindrical portion 4a of the control member 4 via pins 12a, 12b. , Tension springs 13 are attached so as to be close to each other.
[0020]
A cylindrical fixed ring 8 is disposed on the outer diameter side of the brake shoes 10 and 11.
[0021]
The outer diameter portions of the brake shoes 10 and 11 are provided with convex portions 10a and 11a that come into contact with the inner peripheral surface of the fixed ring body 8. The protrusions 10a and 11a are provided on the brake shoes 10 and 11 near the tension spring 13, so that a large frictional force can be applied to the fixed ring 8 by this arrangement.
[0022]
Next, the operation will be described. Here, the rotation power of a motor (not shown) is input to the first rotation shaft 2, and the rotation power input to the first rotation shaft 2 is transmitted to the second rotation shaft 3 according to the rotation speed of the control member 4. Or try to cut off. That is, the first rotating shaft 2 is set to the input side of the rotating power, and the second rotating shaft 3 is set to the output side.
[0023]
First, when the first rotating shaft 2 is not rotating, the clutch body 5 is brought closer to the control member 4 by the resilient urging force of the conical coil spring 7, and as shown in FIG. The frictional surface 5a of the clutch body 5 is pressed against the frictional surface 2a of the first rotary shaft 2 by being located at a deep portion of the two cam grooves 4c and 5b. At this time, since the centrifugal force is not acting on the brake shoes 10, 11, the brake shoes 10, 11 are closed radially inward by the tensile elastic force of the tension spring 13, and the convex portions 10a, 11a are provided. Are separated from the inner peripheral surface of the fixed ring 8. For this reason, the first rotating shaft 2, the second rotating shaft 3, and the control member 4 are integrated and synchronously rotated, that is, a connection state in which rotational power can be transmitted from the first rotating shaft 2 to the second rotating shaft 3. I have.
[0024]
Here, by inputting rotational power to the first rotating shaft 2, the above-mentioned connected state is maintained until the rotating speed of the second rotating shaft 3 exceeds a predetermined rotating speed, but the speed exceeds the predetermined rotating speed. Then, the centrifugal force acting on the brake shoes 10, 11 overcomes the tension elasticity of the tension spring 13, so that the brake shoes 10, 11 open radially outward, and the convex portions 10a, 11a are fixed ring members. 8 is pressed against the inner peripheral surface. Since the rotational speed of the control member 4 is lower than that of the clutch body 5 and the second rotating shaft 3 due to the friction torque, the cam groove 4c of the control member 4 and the cam groove 5b of the clutch body 5 are shifted to one side in the circumferential direction. As shown in FIG. 7, the clutch ball 6 is located at a shallow portion of both the cam grooves 4c and 5b, and the clutch body 5 moves away from the control member 4 against the elastic urging force of the conical coil spring 7. As a result, the friction surface 5a of the clutch body 5 is separated from the friction surface 2a of the first rotating shaft 2. Therefore, a state where the second rotating shaft 3 is relatively rotated with respect to the first rotating shaft 2, that is, a disconnected state where the rotating power is not transmitted from the first rotating shaft 2 to the second rotating shaft 3 is set.
[0025]
When the cutting state is reached, the rotation speeds of the second rotating shaft 3 and the control member 4 decrease, but the rotation speed falls below a predetermined value, and the centrifugal force acting on the brake shoes 10, 11 causes the tension spring 13 to rotate. If the tensile elasticity is superior, the brake shoes 10, 11 close radially inward and the projections 10a, 11a are separated from the inner peripheral surface of the fixed ring 8, so that the rotational resistance of the control member 4 is drastically reduced. On the other hand, the rotation speed of the control member 4 becomes slower than the rotation speeds of the second rotation shaft 3 and the clutch body 5 because the second rotation shaft 3 receives rotation resistance from the counterpart member that transmits the rotation power. In addition, the clutch ball 6 is located at a deep portion of both the cam grooves 4c and 5b, and the clutch body 5 is displaced in a direction approaching to the control member 4 by the elastic biasing force of the conical coil spring 7, so that the friction of the clutch body 5 The surface 5a is pressed against the friction surface 2a of the first rotating shaft 2. Therefore, the second rotating shaft 3 and the control member 4 are integrally and synchronously rotated with respect to the first rotating shaft 2, that is, a connection for transmitting rotational power from the first rotating shaft 2 to the second rotating shaft 3. State.
[0026]
Contrary to the above, when the second rotating shaft 3 is set as the input side and the first rotating shaft 2 is set as the output side, the connection state and the disconnected state can be switched in the same manner as described above.
[0027]
As described above, the clutch device 1 automatically switches between the connected state and the disconnected state using the brake shoes 10 and 11 that operate by centrifugal force. It has a much simpler configuration, and can contribute to a reduction in initial cost and running cost, for example, because a device for controlling the operation of the electromagnetic brake and electric power for the operation control are not required.
[0028]
Further, if the friction torque by the brake shoes 10 and 11 is prevented from acting on the control member 4 in the connected state as in the above embodiment, there is no power transmission loss and the efficiency is high.
[0029]
Note that the present invention is not limited to only the above-described embodiment, and various applications and modifications are possible.
[0030]
(1) The above-described clutch device 1 drives the front wheels with the engine power until the running speed of the vehicle reaches a certain speed, for example, in a hybrid car having two types of power sources of an engine and a motor of the vehicle. And a four-wheel drive mode in which the rear wheels are driven by the motor power, and when the running speed of the vehicle exceeds a certain speed, transmission of the motor power to the rear wheels is cut off to form a front two-wheel drive mode. Can be used for
[0031]
(2) The cam grooves 4c and 5b of the above embodiment can be made gradually shallow only in one circumferential direction. In this case, the pair of cam grooves 4c and 5b need to be arranged in circumferentially opposite directions. In such a configuration, it is necessary to rotate the first rotary shaft 2 serving as the input shaft to only one of them.
[0032]
(3) In the above embodiment, the conical coil spring 7 of the clutch device 1 can be similarly implemented using a disc spring, a cylindrical coil spring, or the like.
[0033]
【The invention's effect】
In the present invention, the switching between the connected state in which the rotational power is transmitted between the first rotary shaft and the second rotary shaft and the disconnected state in which the rotational power is not transmitted is automatically performed by the centrifugal friction member that operates according to the centrifugal force. Thus, the configuration can be simplified and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a connected state of a clutch device according to an embodiment of the present invention; FIG. 2 is a cross-sectional view showing a disconnected state of the clutch device of FIG. 1; FIG. FIG. 4 is an arrow view of a cross section taken along a line. FIG. 4 is an arrow view of a cross section taken along a line (4)-(4) of FIG. 2. FIG. 5 is an exploded perspective view of the clutch device of FIG. FIG. 7 is an enlarged view of a main part showing a connected state. FIG. 7 is an enlarged view of a main part showing a cut state of a cam mechanism in FIG. 2.
DESCRIPTION OF SYMBOLS 1 Clutch device 2 1st rotating shaft 3 2nd rotating shaft 3a 2nd rotating shaft friction surface 4 control member 4c Cam groove of control member 5 Clutch body 5a Clutch body friction surface 5b Clutch body cam groove 6 Clutch ball 7 Conical coil spring 8 Fixed rings 10, 11 Brake shoes

Claims (2)

第1回転軸と第2回転軸との間で回転動力を伝達する接続状態や伝達しない切断状態に切り換えるクラッチ装置であって、
前記第1回転軸に対して軸方向に不動で相対回転可能に支持される制御部材と、
前記第1回転軸に設けられる摩擦面と、
前記第2回転軸の外周に対して周方向に不動で軸方向に変位可能に嵌合されかつ前記第1回転軸の摩擦面に対して接触・離隔される摩擦面を有するクラッチ体と、
前記クラッチ体の摩擦面を前記第1回転軸の摩擦面に対して押し付ける向きに常時付勢する付勢部材と、
所定以上の遠心力を受けたときのみ前記制御部材に対して回転抵抗を付与する遠心摩擦部材と、
前記遠心摩擦部材で前記制御部材に回転抵抗を付与していないときに、前記クラッチ体の摩擦面を前記第1回転軸の摩擦面に対して圧接させて前記接続状態とする一方で、前記遠心摩擦部材で前記制御部材に回転抵抗を付与したときに、前記クラッチ体の摩擦面を前記第1回転軸の摩擦面から離隔させて前記切断状態とするカム機構とを含む、クラッチ装置。
A clutch device that switches between a connected state in which rotational power is transmitted between a first rotary shaft and a second rotary shaft and a disconnected state in which rotary power is not transmitted,
A control member that is supported so as to be axially immovable and relatively rotatable with respect to the first rotation shaft;
A friction surface provided on the first rotation shaft;
A clutch body having a friction surface fitted to the outer periphery of the second rotation shaft so as to be circumferentially immovable and axially displaceable and to be in contact with and separated from the friction surface of the first rotation shaft;
An urging member that constantly urges a friction surface of the clutch body in a direction of pressing the friction surface against the friction surface of the first rotation shaft;
A centrifugal friction member that imparts rotational resistance to the control member only when subjected to a predetermined or higher centrifugal force,
When the rotational resistance is not applied to the control member by the centrifugal friction member, the friction surface of the clutch body is brought into pressure contact with the friction surface of the first rotation shaft to make the connection state, and A cam mechanism configured to separate the friction surface of the clutch body from the friction surface of the first rotation shaft to bring the friction member into the disconnected state when a rotational resistance is applied to the control member by a friction member.
前記カム機構は、前記制御部材および前記クラッチ体において互いに軸方向で対向する面の円周数ヶ所に設けられかつ少なくとも周方向一方へ向けて溝深さが漸次浅く設定されるカム溝と、両カム溝間に周方向転動可能に介装されるクラッチ用玉とを含み、
前記クラッチ用玉が前記両カム溝の深い部分に位置したときに、前記クラッチ体を前記制御部材側へ近づけて前記両摩擦面を圧接させる一方で、前記クラッチ用玉が前記両カム溝の浅い部分に位置したときに、前記クラッチ体を前記制御部材から遠ざけて前記両摩擦面を離隔させる、請求項1のクラッチ装置。
The cam mechanism is provided at several circumferential positions of surfaces of the control member and the clutch body that face each other in the axial direction, and a cam groove whose groove depth is set to be gradually smaller at least in one circumferential direction. Including a clutch ball interposed between the cam grooves so as to be able to roll in the circumferential direction,
When the clutch ball is located in a deep portion of the two cam grooves, the clutch ball is brought closer to the control member to press the two friction surfaces together, while the clutch ball is shallow in the two cam grooves. The clutch device according to claim 1, wherein when located at the portion, the clutch body is moved away from the control member to separate the friction surfaces.
JP2003031510A 2003-02-07 2003-02-07 Clutch device Pending JP2004239406A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
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Family Applications (1)

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Country Status (1)

Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006234165A (en) * 2005-02-22 2006-09-07 General Electric Co <Ge> Rotary device driving system
JP2006307972A (en) * 2005-04-28 2006-11-09 Ntn Corp Direct acting one-way clutch
JP2012026573A (en) * 2010-07-22 2012-02-09 Tai-Her Yang Sliding braking clutch in starting limiting torque
JP2012026575A (en) * 2010-07-22 2012-02-09 Tai-Her Yang Clutch device
JP2012052655A (en) * 2010-07-22 2012-03-15 Tai-Her Yang Clutch device
JP2017003009A (en) * 2015-06-11 2017-01-05 株式会社エクセディ Clutch device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006234165A (en) * 2005-02-22 2006-09-07 General Electric Co <Ge> Rotary device driving system
JP2006307972A (en) * 2005-04-28 2006-11-09 Ntn Corp Direct acting one-way clutch
JP2012026573A (en) * 2010-07-22 2012-02-09 Tai-Her Yang Sliding braking clutch in starting limiting torque
JP2012026575A (en) * 2010-07-22 2012-02-09 Tai-Her Yang Clutch device
JP2012052655A (en) * 2010-07-22 2012-03-15 Tai-Her Yang Clutch device
JP2017003009A (en) * 2015-06-11 2017-01-05 株式会社エクセディ Clutch device

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