JPH06285717A - Tapping holder - Google Patents

Tapping holder

Info

Publication number
JPH06285717A
JPH06285717A JP11204693A JP11204693A JPH06285717A JP H06285717 A JPH06285717 A JP H06285717A JP 11204693 A JP11204693 A JP 11204693A JP 11204693 A JP11204693 A JP 11204693A JP H06285717 A JPH06285717 A JP H06285717A
Authority
JP
Japan
Prior art keywords
rolling element
shaft
clutch
clutch surface
rolling
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
JP11204693A
Other languages
Japanese (ja)
Inventor
Terunori Nagashima
輝教 長嶋
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP11204693A priority Critical patent/JPH06285717A/en
Publication of JPH06285717A publication Critical patent/JPH06285717A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To provide a tapping holder capable of setting the torque value transmitted from a rolling shaft to a driven shaft high and generating little vibration. CONSTITUTION:A tapping holder has an overload preventing device provided with an intermediate rotor 75 supporting the load in the axial direction between a rolling element 75 inserted into a rotatably held through hole 64 and an elastic body 48 pressing the rolling element 75 to a clutch face, the diameter of the torque transmitting rolling element 75 is made small, and the depth of a recess 74 provided on the clutch face and coupled with the rolling element 75 to transmit torque is set to nearly a half of the diameter of the rolling element 75.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、設定したトルク値以上
の負荷が加わった際に、駆動軸と従動軸間との回転伝達
を遮断して、工具の破損を防止する過負荷防止装置を備
えたタッピングホルダーの改善に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overload prevention device for preventing damage to a tool by interrupting rotation transmission between a drive shaft and a driven shaft when a load equal to or more than a set torque value is applied. The present invention relates to the improvement of the provided tapping holder.

【0002】[0002]

【従来の技術】設定した以上のトルクが従動軸に加わっ
た場合に、クラッチが作動してトルクの伝達を中止する
過負荷防止装置を備えたタッピングホルダーとしては、
本件出願人が先に出願した特願昭61−8506号があ
り、これについて図面を参照して説明する。図11は本
発明の従来例を示し、タッピングホルダーの断面を示す
説明図である。図11で示すように従来例のタッピング
ホルダー1は、駆動軸2と一体で形成した円筒体10
と、この円筒体内に設けられ従動軸となり、その先端に
タップ3を着脱可能に設定したホルダー軸20と、この
ホルダー軸に前記円筒体10を押圧する調整円筒ケース
30とからなる。これらの円筒体10とホルダー軸20
及び調整円筒テース30とについて更に説明する。筒状
の円筒体10の底面とホルダー軸20とは、駆動軸2か
ら従動軸への回転伝達を遮断するクラッチ面15が形成
されると共に、筒状の調整円筒ケース30内には、積重
ねした複数の皿ばねよりなる弾性体32によって、クラ
ッチ面側に押圧された中間回転体34を配設している。
2. Description of the Related Art As a tapping holder equipped with an overload prevention device that stops transmission of torque when a torque above a set value is applied to a driven shaft, the clutch operates.
There is Japanese Patent Application No. 61-8506 previously filed by the applicant of the present invention, which will be described with reference to the drawings. FIG. 11 shows a conventional example of the present invention and is an explanatory view showing a cross section of a tapping holder. As shown in FIG. 11, the tapping holder 1 of the conventional example has a cylindrical body 10 formed integrally with the drive shaft 2.
The holder shaft 20 is provided in the cylindrical body and serves as a driven shaft, and the tip of the holder shaft 20 is detachably set, and the adjusting cylindrical case 30 presses the cylindrical body 10 against the holder shaft. These cylindrical body 10 and holder shaft 20
The adjustment cylindrical teeth 30 will be further described. The bottom surface of the cylindrical body 10 and the holder shaft 20 are formed with a clutch surface 15 that blocks rotation transmission from the drive shaft 2 to the driven shaft, and are stacked in the cylindrical adjustment cylindrical case 30. An intermediate rotating body 34, which is pressed toward the clutch surface side, is arranged by an elastic body 32 composed of a plurality of disc springs.

【0003】クラッチ面15と中間回転体34とについ
て、図12及び図13を参照して更に詳細に説明する。
図12は図11で示すクラッチ面と中間回転体とを分解
して示す一部破断斜視図、図13は図12の要部を組合
せした状態を示す説明図である。図12で示すようにク
ラッチ面15は、円筒体10の筒底面とホルダー軸20
の頂部とからなり、その接合部をクラッチ面としてい
る。円筒体10の肩部から、円筒体内の底面に貫通した
複数の貫通孔12を設けると共に、この貫通孔は駆動軸
2からの駆動力を、従動軸に伝えるトルク伝達用で球状
の転動体16を、転動自在な状態で保持することができ
る。貫通孔12と対向したホルダー軸20の頂部には、
転動体16が嵌入する凹部23を設けると共に、これら
の凹部23を結び、転動体16の移動を案内する円周溝
22を設けている。転動体16がこの円周溝22を転動
することで駆動力が遮断されるし、転動体16が凹部2
3に嵌入することで、駆動力を従動軸に伝達するもので
ある。また、この円周溝22と同様の円周溝39が、中
間回転体34側にも対向配置しており、これについては
後述する。尚、トルク伝達用の転動体16の直径は、ホ
ルダー軸20に設けた凹部23内に嵌入した場合に、円
筒体10に設けた貫通孔12からわずかに突出する程度
の大きさに設定している。中間回転体34は円盤状の固
定輪35と、同じく円盤状の回転輪37と、これらの固
定輪35と回転輪37とを回動させる複数の転動体36
とからなる。固定輪35と回転輪37とは対向して配置
され、それぞれの対向面に、複数の転動輪36が回転移
動するための案内溝38を設けている。したがって、弾
性体32によって押圧された固定輪35は固定され、転
動体36を介して設けた回転輪37のみが回転できる状
態に設定している。また、前述したトルク伝達用の転動
体16が移動する円周溝39は、図12の図中で示す回
転輪37の裏面側に設けている。
The clutch surface 15 and the intermediate rotor 34 will be described in more detail with reference to FIGS. 12 and 13.
FIG. 12 is a partially cutaway perspective view showing the clutch surface and the intermediate rotating body shown in FIG. 11 in a disassembled state, and FIG. 13 is an explanatory view showing a state in which the essential parts of FIG. 12 are combined. As shown in FIG. 12, the clutch surface 15 includes the bottom surface of the cylindrical body 10 and the holder shaft 20.
The top surface of the clutch is the clutch surface. A plurality of through holes 12 penetrating from the shoulder portion of the cylindrical body 10 to the bottom surface inside the cylindrical body are provided, and these through holes are spherical rolling elements 16 for torque transmission for transmitting the driving force from the drive shaft 2 to the driven shaft. Can be held in a rollable state. At the top of the holder shaft 20 facing the through hole 12,
A recess 23 into which the rolling element 16 is fitted is provided, and a circumferential groove 22 that connects the recesses 23 and guides the movement of the rolling element 16 is provided. When the rolling element 16 rolls in the circumferential groove 22, the driving force is cut off, and the rolling element 16 moves into the recess 2
By being fitted in 3, the driving force is transmitted to the driven shaft. Further, a circumferential groove 39 similar to the circumferential groove 22 is also arranged to face the intermediate rotating body 34 side, which will be described later. The diameter of the rolling element 16 for torque transmission is set to such a size that it slightly protrudes from the through hole 12 provided in the cylindrical body 10 when fitted into the recess 23 provided in the holder shaft 20. There is. The intermediate rotating body 34 includes a disk-shaped fixed wheel 35, a disk-shaped rotating wheel 37, and a plurality of rolling elements 36 that rotate the fixed wheel 35 and the rotating wheel 37.
Consists of. The fixed wheel 35 and the rotating wheel 37 are arranged to face each other, and a guide groove 38 for rotationally moving the plurality of rolling wheels 36 is provided on each of the facing surfaces. Therefore, the fixed wheel 35 pressed by the elastic body 32 is fixed, and only the rotary wheel 37 provided via the rolling element 36 is set to be rotatable. Further, the circumferential groove 39 in which the rolling element 16 for torque transmission described above moves is provided on the back surface side of the rotating wheel 37 shown in FIG.

【0004】このように形成したクラッチ面15と中間
回転体34との作用を説明する。適正負荷時と設定した
トルク以上の荷重が加わった時に、クラッチ面に形成し
た凹部23と円周溝22とを上下動するトルク伝達用の
転動体16を、回転しにくいワッシャー等で押圧してい
たが、この従来例では回転輪37を有する中間回転体3
4で押圧することによって、凹部23から出入りする転
動体16の抵抗を減らすことができ、転動体16の転が
り運動を円滑にした。その結果、クラッチ面に生じる不
安定な力のつり合いを解消すると共に、皿ばね32の連
れ回りを中間回転体34により防止することができたか
ら、すべり摩擦による摩耗が生じることなく耐久性が向
上した。皿ばね32に摩耗が生じないことは、弾性力が
一定に保持できるから、設定したトルク値が長期間に渡
って安定する過負荷防止装置を備えたタッピングホルダ
ーとなるものである。
The operation of the clutch surface 15 thus formed and the intermediate rotating body 34 will be described. When a load equal to or more than the set torque is applied at the time of appropriate load, the rolling element 16 for torque transmission, which moves up and down the concave portion 23 and the circumferential groove 22 formed on the clutch surface, is pressed by a washer or the like which is hard to rotate. However, in this conventional example, the intermediate rotating body 3 having the rotating wheel 37 is provided.
By pressing with 4, it is possible to reduce the resistance of the rolling element 16 coming in and out from the recess 23, and to make the rolling motion of the rolling element 16 smooth. As a result, the unstable balance of the forces generated on the clutch surface can be eliminated, and the rotation of the disc spring 32 can be prevented by the intermediate rotating body 34. Therefore, wear due to sliding friction does not occur and durability is improved. . The fact that the disc spring 32 does not wear means that the elastic force can be kept constant, so that the set torque value becomes a tapping holder equipped with an overload prevention device that stabilizes over a long period of time.

【0005】[0005]

【発明が解決しようとする課題】転動体16と皿ばね3
2との間に中間回転体34を設けることで、信頼性と耐
久性とを向上させた従来例の過負荷防止装置を備えたタ
ッピングホルダーも設定トルク値を高くするには、転動
体16の直径を大きくしなければならなかった。転動体
16を大きくすることは、転動体が嵌入する凹部23も
転動体の大きさに応じて深くなることであり、クラッチ
の作動時に、凹部に出入する際の転動体16の動きが衝
撃となり、複数の転動体が同時に作動することで衝撃が
増幅され振動が生じた。そして、設定トルク値を高くす
る程、振動も大きくなるという不具合を発生させた。本
発明は、このような不具合を解消するためになされたも
のであり、設定トルク値を高くしても振動が少なく、耐
久性のあるタッピングホルダーの提供を目的とする。
The rolling element 16 and the disc spring 3
In order to increase the set torque value of the tapping holder equipped with the overload prevention device of the conventional example in which the reliability and the durability are improved by providing the intermediate rotating body 34 between the two, I had to increase the diameter. Enlarging the rolling element 16 means that the recess 23 into which the rolling element fits also becomes deeper according to the size of the rolling element, and the movement of the rolling element 16 when moving in and out of the recess during the operation of the clutch becomes an impact. , The impact was amplified by the simultaneous operation of multiple rolling elements, causing vibration. Then, the higher the set torque value is, the larger the vibration is. The present invention has been made to solve such a problem, and an object of the present invention is to provide a tapping holder that is durable and has little vibration even when the set torque value is increased.

【0006】[0006]

【課題を解決するための手段】上記不具合を解決するた
めに、本発明は次のような構成としている。トルク伝達
用の転動体と、この転動体をクラッチ面に押圧する弾性
体間とに、軸方向の荷重を支持する中間回転体を設けた
過負荷防止装置を有するタッピングホルダーにおいて、
前記トルク伝達用の転動体の直径を小さくすると共に、
前記クラッチ面に設けられ、前記転動体が嵌入してトル
クを伝達させる凹部の深さを、転動体の直径の略半分に
設定した。
In order to solve the above problems, the present invention has the following configuration. In a tapping holder having an overload prevention device in which an intermediate rotating body that supports an axial load is provided between a rolling element for torque transmission and an elastic body that presses the rolling element against a clutch surface,
While reducing the diameter of the rolling element for torque transmission,
The depth of the recess provided on the clutch surface and into which the rolling element is fitted to transmit torque is set to approximately half the diameter of the rolling element.

【0007】[0007]

【作用】トルク伝達用の転動体の直径を小さくすること
で、嵌入した転動体が凹所から脱出する際に、移動する
高低差が小さくなるから、作動時の衝撃も少なくなり振
動を小さくおさえることができるものである。また、転
動体が嵌入する凹部の深さを、転動体の直径の略半分に
設定したことで、転動体の脱出傾斜面の角度が大きくク
ラッチ面では略直角になるものである。転動体の凹部か
らの脱出を困難にしたことで、高トルク値を得るように
した。
[Operation] By reducing the diameter of the rolling element for torque transmission, when the inserted rolling element escapes from the recess, the height difference that moves is reduced, so the impact during operation is reduced and vibration is suppressed. Is something that can be done. Further, by setting the depth of the recess into which the rolling element is fitted to be approximately half the diameter of the rolling element, the angle of the escape inclined surface of the rolling element is large, and the angle is substantially right on the clutch surface. By making it difficult for the rolling elements to escape from the recesses, a high torque value was obtained.

【0008】[0008]

【実施例】本発明の実施例について、図面を参照して説
明する。図1は本発明のタッピングホルダーを示す分解
斜視図、図2は図1の要部を示す分解斜視図である。図
1で示すように本発明のタッピングホルダー40は、従
来例と同様に筒状よりなる調整円筒ケース44と、この
調整円筒ケース内に挿入した複数の皿ばねよりなる弾性
体48と、この弾性体に押圧される中間回転体50と、
駆動軸42と一体に形成されクラッチ盤62を有し、そ
の内部に従動軸となるホルダー軸70を保持した円筒体
60とからなる。上述した中間回転体50と円筒体60
とは、更に図2で示すように分解される。すなわち、中
間回転体50は、複数の小球よりなる転動体53を介し
て組合せした円盤状の固定輪52と回転輪54とからな
る。また、クラッチ盤62を有する円筒体60は、その
内部に従動軸となってタップを保持するホルダー軸70
を有する。本発明は、図2で示した中間回転体50と円
筒体60及びホルダー軸70とにその特徴があって、図
1て示した調整円筒ケース44と弾性体48とに関して
は、従来例と同様であり説明は省略する。また、中間回
転体50のうち固定輪52と転動体53とについても従
来例と同様であるからその説明を省略する。
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a tapping holder of the present invention, and FIG. 2 is an exploded perspective view showing a main part of FIG. As shown in FIG. 1, the tapping holder 40 of the present invention includes an adjusting cylindrical case 44 having a cylindrical shape, an elastic body 48 including a plurality of disc springs inserted in the adjusting cylindrical case, and an elastic cylinder 48. An intermediate rotating body 50 that is pressed against the body,
It has a clutch disc 62 which is formed integrally with the drive shaft 42, and a cylindrical body 60 which holds a holder shaft 70 which is a driven shaft therein. The intermediate rotating body 50 and the cylindrical body 60 described above
And are further decomposed as shown in FIG. That is, the intermediate rotating body 50 is composed of a fixed wheel 52 and a rotating wheel 54, which are disk-shaped and are combined via a rolling element 53 composed of a plurality of small balls. Further, the cylindrical body 60 having the clutch disc 62 serves as a driven shaft inside the holder shaft 70 for holding the tap.
Have. The present invention is characterized by the intermediate rotating body 50, the cylindrical body 60, and the holder shaft 70 shown in FIG. 2, and the adjusting cylindrical case 44 and the elastic body 48 shown in FIG. Therefore, the description is omitted. Further, the fixed wheel 52 and the rolling elements 53 of the intermediate rotating body 50 are the same as in the conventional example, and therefore the description thereof is omitted.

【0009】本発明の特徴は、中間回転体50を形成す
る回転輪54に凸状溝55を設けると共に、円筒体60
のクラッチ盤62と、このクラッチ盤及びホルダー軸7
0が接合するクラッチ面72とを改良したことにあるも
ので、これらについて図3及び図4を参照して説明す
る。図3はクラッチ盤62を有する円筒体60と、クラ
ッチ面72を有するホルダー軸70との接合面を分離し
て示す一部破断斜視図、図4はクラッチ盤62を有する
円筒体60と、この円筒体側に押圧される回転軸54と
の接合面を分離して示す一部破断斜視図である。図3で
示すように、ホルダー軸70の頂部はクラッチ面72と
なり、トルク伝達用の転動体75の軌道となる円周溝7
3と、この円周溝と一致して設けられ、転動体75が嵌
入してトルクを伝達するための複数の凹部74とを配設
している。転動体が転動する凹部と円周溝とは従来例で
も設けられていたが、転動体である球体の直径と凹部の
深さとにその特徴があるもので、これについて説明す
る。
A feature of the present invention is that the rotary wheel 54 forming the intermediate rotary body 50 is provided with a convex groove 55 and the cylindrical body 60 is provided.
Clutch plate 62, and this clutch plate and holder shaft 7
This is because the clutch surface 72 to which 0 is joined is improved. These will be described with reference to FIGS. 3 and 4. FIG. 3 is a partially cutaway perspective view showing the joint surface of the cylinder body 60 having the clutch disc 62 and the holder shaft 70 having the clutch surface 72 in a separated manner, and FIG. 4 is the cylinder body 60 having the clutch disc 62. It is a partially broken perspective view which shows separately and shows the joint surface with the rotating shaft 54 pressed on the cylindrical body side. As shown in FIG. 3, the top of the holder shaft 70 serves as the clutch surface 72, and the circumferential groove 7 serving as the orbit of the rolling elements 75 for torque transmission.
3 and a plurality of recesses 74 which are provided so as to coincide with the circumferential groove and into which the rolling elements 75 are fitted to transmit torque. Although the concave portion and the circumferential groove in which the rolling element rolls were also provided in the conventional example, the characteristics are the diameter of the spherical body which is the rolling element and the depth of the concave portion, which will be described.

【0010】従来例の一例として転動体の直径を9ミリ
に設定した場合に、凹部の深さを従来では球体の1/3
である3ミリに設定していた。本発明では転動体75の
直径を5ミリに設定して球体を小さくすると共に、凹部
74の深さを球体の1/2である2.5ミリに設定し
た。すなわち、球体は小さくしたが、球体に対する凹部
の深さの割合が深くなるように設定したことに特徴があ
るものである。このように形成したクラッチ面72に接
合するクラッチ盤62は、円筒体60の図中で示す頂部
に設けられており、これについて説明する。図3で示す
ように筒状円筒体60に形成したクラッチ盤62には、
ホルダー軸に設けた円周溝73に入り込む円周凸溝65
と、転動体75を転動自在に支持する複数の貫通孔64
とを設けている。この貫通孔64は、前述したホルダー
軸に設けた円周溝73と凹部74とに対応して配設して
いる。円筒体60の外側となるクラッチ盤62には、図
4で示すように前述した貫通孔64の開口が配設される
と共に、この貫通孔を結ぶ円周上に凹状溝66を設けて
いる。すなわち、凹状溝66の溝内に貫通孔64が位置
している。この凹状溝66に一致して互いに回転可能な
状態に設定した凸状溝55を、中間回転体50を形成す
る回転輪54に一体で設けている。更に、凸状溝55の
頂部には、転動体75の軌道となる円周溝56を設けて
いる。
As an example of the conventional example, when the diameter of the rolling element is set to 9 mm, the depth of the recess is ⅓ of that of the conventional spherical body.
It was set to 3 mm. In the present invention, the diameter of the rolling element 75 is set to 5 mm to make the sphere small, and the depth of the recess 74 is set to 2.5 mm, which is 1/2 of the sphere. That is, although the sphere is made small, it is characterized in that the ratio of the depth of the concave portion to the sphere is set to be deep. The clutch disc 62 joined to the clutch surface 72 thus formed is provided on the top portion of the cylindrical body 60 shown in the drawing, and this will be described. As shown in FIG. 3, the clutch disc 62 formed on the cylindrical body 60 includes:
Circumferential convex groove 65 that fits into the circumferential groove 73 provided on the holder shaft
And a plurality of through holes 64 that support the rolling elements 75 so that they can roll.
And are provided. The through hole 64 is provided corresponding to the circumferential groove 73 and the recess 74 provided on the holder shaft described above. As shown in FIG. 4, the clutch disc 62 on the outer side of the cylindrical body 60 is provided with the above-mentioned opening of the through hole 64, and a concave groove 66 is provided on the circumference connecting the through holes. That is, the through hole 64 is located in the groove of the concave groove 66. A convex groove 55 that is set to be rotatable relative to the concave groove 66 is provided integrally with the rotary wheel 54 that forms the intermediate rotating body 50. Further, on the top of the convex groove 55, there is provided a circumferential groove 56 which becomes the orbit of the rolling element 75.

【0011】このように形成した回転輪54と円筒体6
0及びホルダー軸70との組合せ状態を、図5及び図6
を参照して説明する。図5は本発明の要部を組合せした
状態を示す説明図。図6は図5の転動体周辺を拡大して
示す説明図である。図5で示すように中間回転体50を
形成する回転輪54は、一体に設けた凸状溝55を円筒
体60側に向けて配設すると、調整円筒ケース44の内
部に設けた弾性体48の作用によって、ホルダー軸70
側に押圧された状態で取付けられる。凸状溝55とホル
ダー軸70との間には、従来例と同様にトルク伝達用の
転動体75が、円筒体60によって転動自在に保持され
ており、これらの関係について、図6を参照して更に詳
細に説明する。図6で示す図中の右側は、転動体75が
ホルダー軸70に設けた凹部74に嵌入され、従動軸に
トルクを伝達中であることを示す。また、図6で示す図
中の左側は、転動体75が凹部74から脱出して、ホル
ダー軸70に設けた円周溝73上を回動することで、ク
ラッチが作動している状態を示している。従動軸に対す
るトルクを伝達している間は、転動体75の下半分が転
動体の直径の1/2の深さに設定した凹部74に嵌入し
ており、上半分は円筒体60に設けた貫通孔64内に支
持されて、円筒体60とホルダー軸70とが共回りをし
ている。尚、貫通孔64の中には、回転体54と一体で
設けた凸状溝55が入り込み、凸状溝の頂部に設けた円
周溝56で、転動体75の頂部を押圧している。
The rotating wheel 54 and the cylindrical body 6 thus formed.
0 and the holder shaft 70 in a combined state are shown in FIGS.
Will be described with reference to. FIG. 5 is an explanatory view showing a state in which the essential parts of the present invention are combined. FIG. 6 is an explanatory diagram showing the rolling elements and their surroundings in FIG. 5 in an enlarged manner. As shown in FIG. 5, in the rotary wheel 54 forming the intermediate rotary body 50, when the integrally formed convex groove 55 is arranged toward the cylindrical body 60 side, the elastic body 48 provided inside the adjustment cylindrical case 44 is provided. By the action of the holder shaft 70
It is attached while being pressed to the side. A rolling element 75 for torque transmission is rotatably held by the cylindrical body 60 between the convex groove 55 and the holder shaft 70, similarly to the conventional example. For the relationship between these, refer to FIG. Then, it will be described in more detail. The right side of the drawing shown in FIG. 6 shows that the rolling element 75 is fitted into the recess 74 provided in the holder shaft 70 and torque is being transmitted to the driven shaft. Further, the left side of the drawing shown in FIG. 6 shows a state where the rolling element 75 is released from the recess 74 and is rotated on the circumferential groove 73 provided on the holder shaft 70, thereby operating the clutch. ing. While transmitting the torque to the driven shaft, the lower half of the rolling element 75 is fitted into the recess 74 having a depth of 1/2 of the diameter of the rolling element, and the upper half is provided on the cylindrical body 60. The cylindrical body 60 and the holder shaft 70 rotate together while being supported in the through hole 64. A convex groove 55 formed integrally with the rotating body 54 is inserted into the through hole 64, and the circumferential groove 56 provided at the top of the convex groove presses the top of the rolling element 75.

【0012】貫通孔64内に凸状溝55を配設した理由
を説明する。転動体75の直径を小さくすると、貫通孔
64の深さも浅くしなければならないが、強度上の問題
があって浅くできない為に、回転体に凸状溝55を設け
ることで、貫通孔内で転動体75を押圧するようにし
た。すなわち、凸状溝55を貫通孔内に配設すること
で、貫通孔の深さを見掛上で浅くなるように設定したも
のである。従動軸であるホルダー軸70に、設定した以
上の大きな負荷がかかって回転が止まると、転動体75
には、駆動軸によって転動体を回転させる力が働いてい
るので、回転体54を図中の矢印で示す方向に上昇させ
ると共に、転動体75は凹部74から脱出する。この状
態はクラッチが作動した状態であり、転動体75が円周
溝73を回転移動することで、円筒体60とホルダー軸
70とを空回りさせるものである。次にホルダー軸のク
ラッチ面に設けた円周溝73と、クラッチ盤のクラッチ
面に設けた円周凸溝65との作用について図7乃至図9
を用いて説明する。図7は転動体の嵌入する凹部が浅い
場合を示す説明図、図8は同じく凹部が深い場合を示す
説明図、図9は同じく凹部が深い場合で、クラッチ盤に
本願の円周凸溝を設けた場合を示す説明図である。駆動
軸からのトルク伝達は転動体と駆動軸との接点76にお
いて行われる。図7においてホルダー軸の凹部74が、
転動体の半径より十分浅い場合に、接点76は貫通孔6
4の途中にあるから強度上の問題は起きないが、図8で
示すように凹部74の深さが転動体の半径より深い場合
に、接点76は貫通孔64のふちになり、鋭角な穴のふ
ちがかけたり、つぶれたりする危険がある。凹部74が
転動体の半径に近い場合も、接点76は貫通穴64のふ
ちからいくらも離れておらず穴のふちが破損する危険が
ある。しかし、図9で示すようにクラッチ盤に凸状溝6
5を設けることで、接点76が貫通孔64のふちから離
れることになり、ふちが破損する危険をまぬがれる。ま
た、凸状溝65が入り込むようにホルダー軸のクラッチ
面に凹状溝73を設けたので、クラッチ面は隙間なく嵌
合することができる。
The reason for disposing the convex groove 55 in the through hole 64 will be described. If the diameter of the rolling element 75 is reduced, the depth of the through hole 64 must also be made shallow. However, since there is a problem in strength and it cannot be made shallow, by providing the convex groove 55 in the rotating body, The rolling element 75 is pressed. That is, by disposing the convex groove 55 in the through hole, the depth of the through hole is set to be apparently shallow. When the holder shaft 70, which is a driven shaft, is loaded with a larger load than the set value and stops rotating, the rolling element 75
Since a force for rotating the rolling element by the drive shaft is exerted on the rolling element, the rolling element 54 is lifted in the direction indicated by the arrow in the figure, and the rolling element 75 escapes from the recess 74. In this state, the clutch is in operation, and the rolling element 75 rotationally moves in the circumferential groove 73 to idle the cylindrical body 60 and the holder shaft 70. Next, the operation of the circumferential groove 73 provided on the clutch surface of the holder shaft and the circumferential convex groove 65 provided on the clutch surface of the clutch disc will be described with reference to FIGS.
Will be explained. FIG. 7 is an explanatory view showing a case where the recess into which the rolling element is fitted is shallow, FIG. 8 is an explanatory view showing a case where the recess is also deep, and FIG. 9 is a case where the recess is also deep, and the circumferential convex groove of the present application is provided on the clutch disc. It is explanatory drawing which shows the case where it provided. The torque is transmitted from the drive shaft at the contact point 76 between the rolling element and the drive shaft. In FIG. 7, the recess 74 of the holder shaft is
When the rolling element is sufficiently shallower than the radius of the rolling element, the contact point 76 has the through hole 6
Since there is no problem in strength because it is in the middle of 4, the contact point 76 becomes the edge of the through hole 64 when the depth of the recess 74 is deeper than the radius of the rolling element as shown in FIG. There is a risk that the edges of the product may fall or be crushed. Even when the concave portion 74 is close to the radius of the rolling element, the contact point 76 is not far from the edge of the through hole 64, and the edge of the hole may be damaged. However, as shown in FIG. 9, the convex groove 6 is formed on the clutch disc.
By providing 5, the contact point 76 is separated from the edge of the through hole 64, and the risk of damaging the edge is avoided. Further, since the concave groove 73 is provided on the clutch surface of the holder shaft so that the convex groove 65 is inserted, the clutch surface can be fitted without a gap.

【0013】本発明のタッピングホルダーが、従来例よ
りも高いトルク値に設定できる理由について図10を参
照して説明する。図10は図6で示した転動体と凹部と
を拡大して、その作用を説明するための説明図である。
従来例と本願との転動体では、その大きさが異なるもの
てあるが、説明の都合上により、図10では同一の大き
さで示している。図10で示すように凹所74の深さ
を、従来例では転動体の直径の1/3である深さAに設
定していたが、本発明では転動体の直径の1/2である
深さBに設定してある。よって、従来例の深さAに設定
した場合に、転動体が凹部から脱出するには、図中の角
度Cで示す傾斜面を上昇することになるが、本願では深
さBに設定したから、転動体が凹部から脱出するには、
図中の角度Dで示す略直角の急斜面を上昇する必要があ
って、脱出しにくい状態に設定している。転動体の凹部
からの脱出が困難であることは、トルク値が高くなけれ
ば脱出できないことであるから、転動体と凹部との深さ
を転動体の直径の1/2に設定したことで、高いトルク
値を得られるようにしたものである。球体である転動体
75の直径を、従来例よりも小さくした結果、凹部の深
さを球体の1/2に設定したにもかかわらず、トルク伝
達中とクラッチ作動時に動く転動体の上下動が、従来例
よりも小さくなり、衝撃の緩和によって振動を小さくし
たものである。本発明のタッピングホルダーを、ボール
盤などのようにテーパー穴を有する工作機械の主軸に直
接取付できる形式のもので説明したが、工具の迅速交換
を目的としたタップコレット形式のものにも適用できる
ことはもちろんのことである。尚、実施例で説明したク
ラッチ面は駆動軸、または従動軸のどちら側に形成して
も良く、設計の都合により適宜選択使用をすることがで
きる。
The reason why the tapping holder of the present invention can set a torque value higher than that of the conventional example will be described with reference to FIG. FIG. 10 is an explanatory view for explaining the action of the rolling element and the recess shown in FIG. 6 in an enlarged manner.
Although the rolling elements of the conventional example and the present application have different sizes, they are shown in the same size in FIG. 10 for convenience of explanation. As shown in FIG. 10, the depth of the recess 74 is set to the depth A which is 1/3 of the diameter of the rolling element in the conventional example, but is 1/2 of the diameter of the rolling element in the present invention. The depth is set to B. Therefore, when the rolling element is set to the depth A of the conventional example, in order to escape from the recessed portion, the sloped surface indicated by the angle C in the figure is raised, but in the present application, it is set to the depth B. , To escape the rolling element from the recess,
It is necessary to ascend a steep slope having a substantially right angle indicated by an angle D in the figure, which is set in a state where it is difficult to escape. The difficulty in escaping the rolling element from the recess is that it cannot escape unless the torque value is high. Therefore, by setting the depth of the rolling element and the dent to ½ of the diameter of the rolling element, This is to obtain a high torque value. As a result of making the diameter of the rolling element 75, which is a sphere, smaller than that of the conventional example, the vertical movement of the rolling element that moves during torque transmission and during clutch operation is set even though the depth of the recess is set to 1/2 of the sphere. It is smaller than the conventional example, and the vibration is reduced by relaxing the impact. The tapping holder of the present invention has been described as a type that can be directly attached to the spindle of a machine tool having a tapered hole such as a drilling machine, but it is also applicable to a tap collet type for the purpose of quick tool change. Of course. The clutch surface described in the embodiments may be formed on either side of the drive shaft or the driven shaft, and can be appropriately selected and used depending on the design.

【0014】[0014]

【発明の効果】以上説明したように本発明によれば、ト
ルク伝達用の転動体を保持し、クラッチ面に設けた貫通
孔の深さを見掛上で浅くして、転動体の直径を小さくす
ると共に、トルク伝達のために設けた凹部の深さを、転
動体の直径の半分の深さに設定したことによって、多く
の効果を得ることができた。すなわち、転動体を小さく
することて、凹部から脱出するための高低差を小さくし
て衝撃を緩和し、振動を小さくすると共に振動音を減少
させて、使用時の不快感を解消することができた。転動
体が嵌入してトルクを伝達するための凹部深さを、転動
体の直径の半分に設定したことにより、転動体の凹部か
らの脱出を困難な状態にして高トルク値を得ることがで
きた。また、転動体の直径を小さくすることで、クラッ
チ盤も小型化することができ、工具全体を小型軽量化す
ることができたなど、多くの効果を得ることができた。
As described above, according to the present invention, the diameter of the rolling element is reduced by holding the rolling element for torque transmission and making the depth of the through hole provided in the clutch surface apparently shallow. Many effects can be obtained by reducing the depth and setting the depth of the concave portion provided for torque transmission to half the diameter of the rolling element. That is, by reducing the size of the rolling element, the height difference for escaping from the recess can be reduced to mitigate the impact, reduce the vibration and reduce the vibration noise, and the discomfort during use can be eliminated. It was By setting the depth of the recess for inserting the rolling element and transmitting torque to half the diameter of the rolling element, it is possible to obtain a high torque value by making it difficult for the rolling element to escape from the recess. It was Further, by reducing the diameter of the rolling elements, the clutch disk can be downsized, and the entire tool can be downsized and lightened.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明のタッピングホルダーを示す分解斜視図
である。
FIG. 1 is an exploded perspective view showing a tapping holder of the present invention.

【図2】図1の要部を示す分解斜視図である。FIG. 2 is an exploded perspective view showing a main part of FIG.

【図3】図2で示したクラッチ盤を有する円筒体と、ク
ラッチ面を有するホルダー軸との接合面を分離して示す
一部破断斜視図である。
FIG. 3 is a partially cutaway perspective view showing a joint surface between a cylindrical body having the clutch disc shown in FIG. 2 and a holder shaft having a clutch surface, separately.

【図4】図2で示した円筒体と、この円筒体側に押圧さ
れる回転軸との接合面を分離して示す一部破断斜視図で
ある。
FIG. 4 is a partially cutaway perspective view showing a joint surface of the cylindrical body shown in FIG. 2 and a rotary shaft pressed against the cylindrical body, separately.

【図5】本発明の要部を組合せした状態を示す説明図で
ある。
FIG. 5 is an explanatory diagram showing a state in which the essential parts of the present invention are combined.

【図6】図5の転動体周辺を拡大して示す説明図であ
る。
6 is an explanatory view showing the periphery of the rolling element of FIG. 5 in an enlarged manner.

【図7】転動体と凹部との関係を示し、転動体が嵌入す
る凹部が浅い場合を示す説明図である。
FIG. 7 is an explanatory view showing a relationship between a rolling element and a concave portion, showing a case where the concave portion into which the rolling element is fitted is shallow.

【図8】転動体と凹部との関係を示し、転動体が嵌入す
る凹部が深い場合を示す説明図である。
FIG. 8 is an explanatory view showing a relationship between a rolling element and a concave portion, showing a case where the concave portion into which the rolling element is fitted is deep.

【図9】転動体と凹部との関係を示し、転動体が嵌入す
る凹部が深い例で、クラッチ盤に本願の円周凸状溝を設
けた場合を示す説明図である。
FIG. 9 is an explanatory view showing a relationship between rolling elements and concave portions, in which a concave portion into which the rolling elements are fitted is deep, and a case where the circumferential convex groove of the present application is provided on the clutch disc.

【図10】図6で示す転動体と凹部とを拡大し、その作
用を説明するたの説明図である。
FIG. 10 is an explanatory view for explaining the action by enlarging the rolling element and the recess shown in FIG.

【図11】本発明の従来例でタッピングホルダーの断面
を示す説明図である。
FIG. 11 is an explanatory view showing a cross section of a tapping holder in a conventional example of the present invention.

【図12】図8で示したクラッチと中間回転体とを分解
して示す一部破断斜視図である。
12 is a partially cutaway perspective view showing the clutch and the intermediate rotating body shown in FIG. 8 in an exploded manner.

【図13】図9の要部を組合せした状態を示す説明図で
ある。
13 is an explanatory diagram showing a state in which the main parts of FIG. 9 are combined.

【符号の説明】[Explanation of symbols]

40 タッピングホルダー 48 弾性体 50 中間回転体 54 回転輪 55 凸状溝 60 円筒体 64 貫通孔 66 凹状溝 70 ホルダー軸 72 クラッチ面 74 凹部 75 転動体 40 tapping holder 48 elastic body 50 intermediate rotating body 54 rotating ring 55 convex groove 60 cylindrical body 64 through hole 66 concave groove 70 holder shaft 72 clutch surface 74 concave portion 75 rolling element

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】クラッチ盤を有する駆動軸とこの駆動軸に
より作動される従動軸との接合部をクラッチ面として、
このクラッチ面を介して駆動軸のトルクを従動軸に伝え
るトルク伝達用の転動体と、この転動体を前記クラッチ
面に押圧する弾性体との間に、軸方向の荷重を支持する
中間回転体を設けて過負荷防止装置としたタッビングホ
ルダーにおいて、 前記クラッチ面の一方の面で、前記転動体を転動自在に
保持した複数の貫通孔と、これらの貫通孔を結ぶ円周に
そって前記クラッチ面に設けた円周凸溝と、この円周凸
溝を設けたクラッチ面の裏面側で、前記貫通孔を結ぶ円
周にそって設けた凹状溝とを有する第1の軸と、 この第1の軸に設けたクラッチ面と対向配置した他方の
クラッチ面に設けられ、前記転動体が嵌入してトルクを
伝達する凹部を転動体の略半径の深さに設定すると共
に、前記第1の軸に設けた円周凸溝が入り込む凹状の円
周溝を前記転動体の軌道として設けた第2の軸と、 前記第1の軸に設けた凹状溝に入り込む凸状溝を、前記
中間回転体を形成する回転輪に設けたことを特徴とする
タッピングホルダー。
1. A clutch surface is a joint between a drive shaft having a clutch disc and a driven shaft operated by the drive shaft.
An intermediate rotating body that supports a load in the axial direction between a rolling body for torque transmission that transmits the torque of the drive shaft to the driven shaft via the clutch surface and an elastic body that presses the rolling body against the clutch surface. In a tabbing holder that is provided with an overload prevention device, a plurality of through holes that rotatably hold the rolling elements on one surface of the clutch surface, and along a circumference that connects these through holes. A first shaft having a circumferential convex groove provided on the clutch surface, and a concave groove provided along the circumference connecting the through holes on the back surface side of the clutch surface provided with the circumferential convex groove; A recess provided on the other clutch surface that is disposed opposite to the clutch surface provided on the first shaft and into which the rolling element is fitted to transmit torque is set to a depth of substantially the radius of the rolling element, and The concave circumferential groove that the circumferential convex groove provided on the shaft of 1 enters A tapping holder characterized in that a second shaft provided as a track of the rolling element and a convex groove that enters a concave groove provided in the first shaft are provided in a rotary wheel that forms the intermediate rotating body. .
JP11204693A 1993-04-02 1993-04-02 Tapping holder Pending JPH06285717A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11204693A JPH06285717A (en) 1993-04-02 1993-04-02 Tapping holder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11204693A JPH06285717A (en) 1993-04-02 1993-04-02 Tapping holder

Publications (1)

Publication Number Publication Date
JPH06285717A true JPH06285717A (en) 1994-10-11

Family

ID=14576669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11204693A Pending JPH06285717A (en) 1993-04-02 1993-04-02 Tapping holder

Country Status (1)

Country Link
JP (1) JPH06285717A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103357975A (en) * 2013-07-08 2013-10-23 安徽全柴锦天机械有限公司 Tapping limit device for drill machine
CN114515873A (en) * 2022-03-04 2022-05-20 徐州昌宇能源设备有限公司 Full-automatic tapping machine for metal manufacturing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103357975A (en) * 2013-07-08 2013-10-23 安徽全柴锦天机械有限公司 Tapping limit device for drill machine
CN114515873A (en) * 2022-03-04 2022-05-20 徐州昌宇能源设备有限公司 Full-automatic tapping machine for metal manufacturing

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