JPH08270673A - Torque limiter - Google Patents
Torque limiterInfo
- Publication number
- JPH08270673A JPH08270673A JP7071434A JP7143495A JPH08270673A JP H08270673 A JPH08270673 A JP H08270673A JP 7071434 A JP7071434 A JP 7071434A JP 7143495 A JP7143495 A JP 7143495A JP H08270673 A JPH08270673 A JP H08270673A
- Authority
- JP
- Japan
- Prior art keywords
- inner ring
- ring
- torque
- torque limiter
- lubricant
- 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
Links
Landscapes
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、回転トルクの伝達と
遮断とを行なうトルクリミッタに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque limiter for transmitting and blocking rotational torque.
【０００２】[0002]
【従来の技術】この種のトルクリミッタとして、図４に
示したものが従来から知られている。このトルクリミッ
タは、内輪１１とその外側に回転自在に設けられた外輪
１２との間にコイルばね１３を組込み、そのコイルばね
１３に内輪１１の外径面を締付ける小径コイル部１３ａ
を設け、上記コイルばね１３の両端に形成された折曲片
１４、１５の一方を外輪１２の閉塞端に連結し、他方の
折曲片１５を外輪１２の開口端部に回転可能に圧入した
調整リング１６に連結している。2. Description of the Related Art As a torque limiter of this type, the one shown in FIG. 4 has been conventionally known. This torque limiter incorporates a coil spring 13 between an inner ring 11 and an outer ring 12 rotatably provided on the outer side of the inner ring 11, and a small diameter coil portion 13a for tightening an outer diameter surface of the inner ring 11 on the coil spring 13.
One of the bent pieces 14, 15 formed at both ends of the coil spring 13 is connected to the closed end of the outer ring 12, and the other bent piece 15 is rotatably press-fitted into the open end of the outer ring 12. It is connected to the adjusting ring 16.
【０００３】上記トルクリミッタにおいては、調整リン
グ１６側から見て、内輪１１をコイルばね１３の巻方向
と逆方向に回転させると、内輪１１との接触によってコ
イルばね１３の小径コイル部１３ａに拡径方向の力が作
用するが、上記小径コイル部１３ａの折曲片１４が外輪
１２に連結されているため、小径コイル部１３ａは縮径
し、内輪１１を締付ける。In the above torque limiter, when the inner ring 11 is rotated in the direction opposite to the winding direction of the coil spring 13 when viewed from the adjusting ring 16 side, the inner ring 11 contacts the inner ring 11 and expands to the small diameter coil portion 13a of the coil spring 13. Although a radial force acts, since the bent piece 14 of the small-diameter coil portion 13a is connected to the outer ring 12, the small-diameter coil portion 13a contracts and tightens the inner ring 11.
【０００４】このため、内輪１１の回転はコイルばね１
３を介して外輪１２に伝達され、外輪１２が内輪１１と
同方向に回転する。Therefore, the inner ring 11 is rotated by the coil spring 1.
3 is transmitted to the outer ring 12, and the outer ring 12 rotates in the same direction as the inner ring 11.
【０００５】外輪１２の負荷が増し、コイルばね１３の
小径コイル部１３ａが内輪１１を締付ける緊縛力が小径
コイル部１３ａと内輪１１の接触部における摩擦力より
小さくなると、内輪１１と小径コイル部１３ａとの間で
滑りが生じ、外輪１２への回転トルクの伝達が遮断され
る。When the load on the outer ring 12 increases and the binding force of the small-diameter coil portion 13a of the coil spring 13 for fastening the inner ring 11 becomes smaller than the frictional force at the contact portion between the small-diameter coil portion 13a and the inner ring 11, the inner ring 11 and the small-diameter coil portion 13a. A slip occurs between the outer ring 12 and the outer ring 12, and the transmission of the rotational torque to the outer ring 12 is blocked.
【０００６】また、内輪１１をコイルばね１３の巻方向
に回転させると、コイルばね１３の小径コイル部１３ａ
が上記と逆に拡径され、内輪１１と小径コイル部１３と
の間で滑りが生じ、外輪１２への回転トルクの伝達は遮
断される。When the inner ring 11 is rotated in the winding direction of the coil spring 13, the small diameter coil portion 13a of the coil spring 13 is rotated.
In contrast to the above, the diameter is increased, slippage occurs between the inner ring 11 and the small-diameter coil portion 13, and the transmission of the rotational torque to the outer ring 12 is blocked.
【０００７】上記トルクリミッタにおいては、部品点数
が少なく、組立てが容易であって製造コストが安く、し
かも、外輪１２に対して調整リング１６を回転させる
と、コイルばね１３の小径コイル部１３ａの内径が変化
して緊縛力が変わるため、内輪１１から外輪１２への伝
達可能なトルクの大きさを調整することができるという
特徴を有する。In the above torque limiter, the number of parts is small, the assembly is easy and the manufacturing cost is low, and when the adjusting ring 16 is rotated with respect to the outer ring 12, the inner diameter of the small diameter coil portion 13a of the coil spring 13 is increased. Has a characteristic that the magnitude of the torque that can be transmitted from the inner ring 11 to the outer ring 12 can be adjusted.
【０００８】[0008]
【発明が解決しようとする課題】ところで、上記トルク
リミッタにおいては、トルク伝達の遮断時、内輪１１は
小径コイル部１３ａと接触回転するため、内輪１１と小
径コイル部１３ａとの接触部に摩耗が生じ易く、その磨
耗を防止するため、内輪１１と小径コイル部１３ａとの
接触部をグリース潤滑することが行なわれている。ここ
で、グリースは外輪１２の内部に封入する構成であるた
め、トルクリミッタを高速回転させた場合、その回転初
期におけるトルク変動が大きく、トルク精度を向上させ
るうえにおいて改善すべきところが残されている。In the above torque limiter, when the torque transmission is cut off, the inner ring 11 rotates in contact with the small-diameter coil portion 13a, so that the contact portion between the inner ring 11 and the small-diameter coil portion 13a is abraded. In order to prevent the wear of the inner ring 11 and the small-diameter coil portion 13a, the contact portion between the inner ring 11 and the small-diameter coil portion 13a is lubricated with grease. Here, since the grease is sealed inside the outer ring 12, when the torque limiter is rotated at a high speed, the torque fluctuation is large at the initial stage of rotation, and there are some points to be improved in improving the torque accuracy. .
【０００９】すなわち、図４に示すトルクリミッタの外
輪１２内部にグリースを封入し、その外輪１２を停止さ
せた状態で内輪１１をすべり回転させて内輪１１のトル
クを測定したところ、図５に示す試験結果を得た。That is, when the inner ring 11 is rotated while the outer ring 12 of the torque limiter shown in FIG. 4 is filled with grease and the outer ring 12 is stopped to measure the torque of the inner ring 11, it is shown in FIG. The test result was obtained.
【００１０】ここで、Ｎo.１は内輪１１を６４０ｒｐｍ
で回転させた場合のトルク測定結果を示し、また、Ｎo.
２は内輪１１を１０００ｒｐｍで回転させた場合のトル
ク測定結果を示す。いずれの場合も、０．２秒運転、
０．３秒停止させるパターンで運転を行なった。[0010] Here, No. 1 is the inner ring 11 640rpm
The torque measurement result when rotated at is shown.
2 shows the torque measurement result when the inner ring 11 is rotated at 1000 rpm. In any case, 0.2 seconds operation,
The operation was performed in a pattern of stopping for 0.3 seconds.
【００１１】上記試験結果から明らかなように、グリー
スを封入したトルクリミッタにおいては、初期トルクの
増加が発生する。その原因は、内輪１１の回転初期にお
いてグリースが攪拌されるため、回転抵抗となり、時間
の経過と共にグリースになじみが生じるからであると考
えられる。As is clear from the above test results, an increase in initial torque occurs in the torque limiter filled with grease. It is considered that the reason is that the grease is agitated in the initial stage of rotation of the inner ring 11 and thus becomes a rotation resistance, and the grease becomes familiar with the passage of time.
【００１２】上記のように、回転初期にトルクの変動が
あると、内輪の回転初期にその内輪の回転を外輪に伝え
ることができない場合が生じる。As described above, if the torque fluctuates in the initial stage of rotation, the rotation of the inner ring may not be transmitted to the outer ring in the initial stage of rotation of the inner ring.
【００１３】この発明の課題は、コイルばねを用いたト
ルクリミッタの初期トルクの安定化を図ることである。An object of the present invention is to stabilize the initial torque of a torque limiter using a coil spring.
【００１４】[0014]
【課題を解決するための手段】上記の課題を解決するた
めに、この発明においては、内輪と外輪との間にコイル
ばねを組込み、そのコイルばねに内輪の外径面を締付け
る小径コイル部を設けたトルクリミッタにおいて、前記
内輪を焼結体で形成し、その内輪に潤滑剤を含浸させた
構成を採用している。In order to solve the above problems, in the present invention, a coil spring is incorporated between an inner ring and an outer ring, and a small diameter coil portion for tightening the outer diameter surface of the inner ring is attached to the coil spring. In the provided torque limiter, the inner ring is formed of a sintered body, and the inner ring is impregnated with a lubricant.
【００１５】ここで、潤滑剤として、グリースや潤滑油
を挙げることができる。Here, examples of the lubricant include grease and lubricating oil.
【００１６】[0016]
【作用】上記のように、焼結体から成る内輪に潤滑剤を
含浸させることにより、トルクリミッタの運転時、潤滑
剤は内輪の外径面に滲出して内輪と小径コイル部との接
触部を潤滑する。このため、潤滑剤が攪拌されるという
ことがなく、運転開始から安定したトルクを発生させる
ことができる。As described above, by impregnating the inner ring made of the sintered body with the lubricant, the lubricant exudes to the outer diameter surface of the inner ring when the torque limiter is operated, and the contact portion between the inner ring and the small diameter coil portion Lubricate. Therefore, the lubricant is not agitated, and stable torque can be generated from the start of operation.
【００１７】[0017]
【実施例】以下、この発明の実施例を図１乃至図３に基
づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
【００１８】図１は、この発明の第１の実施例を示す。
この実施例におけるトルクリミッタは、先に述べた従来
例と同様に、内輪１と、その内輪１に回転自在に設けら
れた外輪２と、その両輪１、２間に組込まれたコイルば
ね３とを有し、コイルばね３には内輪１の外径面を締付
ける小径コイル部３ａと、両輪１、２に対して非接触の
大径コイル部３ｂとが設けられている。FIG. 1 shows a first embodiment of the present invention.
The torque limiter in this embodiment includes an inner ring 1, an outer ring 2 rotatably provided on the inner ring 1, and a coil spring 3 incorporated between the two wheels 1, 2 as in the conventional example described above. The coil spring 3 is provided with a small-diameter coil portion 3a that tightens the outer diameter surface of the inner ring 1 and a large-diameter coil portion 3b that is not in contact with both wheels 1 and 2.
【００１９】小径コイル部３ａの端部には折曲片４が設
けられ、その折曲片４が外輪２の閉塞端に連結されてい
る。一方、大径コイル部３ｂの端部には折曲片５が設け
られ、その折曲片５は外輪２の開口端部に回転可能に圧
入された調整リング６に連結されている。A bending piece 4 is provided at the end of the small-diameter coil portion 3a, and the bending piece 4 is connected to the closed end of the outer ring 2. On the other hand, a bent piece 5 is provided at the end of the large-diameter coil portion 3b, and the bent piece 5 is connected to an adjusting ring 6 rotatably press-fitted into the open end of the outer ring 2.
【００２０】前記内輪１は金属粉末の焼結体から成り、
その内部には潤滑剤が含浸されている。潤滑剤は潤滑油
であってもよく、グリースであってもよい。The inner ring 1 is made of a sintered body of metal powder,
The inside is impregnated with a lubricant. The lubricant may be lubricating oil or grease.
【００２１】ここで、内輪１は潤滑剤の滲出を容易とす
るため、表面粗さＲａは０．６〜１．０程度とされてい
る。The inner ring 1 has a surface roughness Ra of about 0.6 to 1.0 in order to facilitate the exudation of the lubricant.
【００２２】上記の構成から成るトルクリミッタの作用
は、先に述べた図４に示すトルクリミッタの作用と同一
であるため説明を省略する。The operation of the torque limiter having the above structure is the same as the operation of the torque limiter shown in FIG.
【００２３】第１の実施例で示すように、内輪１を焼結
体で形成して潤滑剤を含浸させることにより、トルクリ
ミッタの運転時、潤滑剤は内輪１の外径面に滲出し、そ
の潤滑剤によって内輪１と小径コイル部３ａの接触部が
潤滑される。As shown in the first embodiment, the inner ring 1 is made of a sintered body and impregnated with the lubricant, so that the lubricant oozes to the outer diameter surface of the inner ring 1 during the operation of the torque limiter. The lubricant lubricates the contact portion between the inner ring 1 and the small-diameter coil portion 3a.
【００２４】このように、内輪１に含浸させた潤滑剤に
よって内輪１と小径コイル部３ａとの接触部を潤滑する
ことにより、潤滑剤が攪拌されることはなく、内輪１の
回転初期から回転抵抗が一定し、初期トルクの安定化を
図ることができる。As described above, by lubricating the contact portion between the inner ring 1 and the small-diameter coil portion 3a with the lubricant impregnated in the inner ring 1, the lubricant is not agitated, and the inner ring 1 rotates from the initial stage of rotation. Since the resistance is constant, the initial torque can be stabilized.
【００２５】因みに、図１に示すトルクリミッタの外輪
２を停止させ、潤滑油を含浸させた内輪１を高速回転さ
せて内輪１のトルクを測定したところ、図３に示す結果
を得た。Incidentally, when the outer ring 2 of the torque limiter shown in FIG. 1 was stopped and the inner ring 1 impregnated with lubricating oil was rotated at a high speed to measure the torque of the inner ring 1, the results shown in FIG. 3 were obtained.
【００２６】ここで、測定条件は、内輪１の回転数を１
０００ｒｐｍとして、０．２秒運転、０．３秒停止を運
転パターンとして試験を行なった。Here, the measurement condition is that the number of rotations of the inner ring 1 is 1
The test was carried out at an operating pattern of 000 rpm for 0.2 second operation and 0.3 second stop.
【００２７】上記の結果から明らかなように、運転開始
からトルクの変化がなく、回転初期からトルクが安定し
ていることが理解できる。As is clear from the above results, it can be understood that there is no change in torque from the start of operation and the torque is stable from the initial stage of rotation.
【００２８】図２はこの発明の第２の実施例を示す。こ
の実施例では、コイルばね３として丸形線材から成る丸
ばねを用い、そのコイルばね３における小径コイル部３
ａの螺旋部杆に間隔を設けている。FIG. 2 shows a second embodiment of the present invention. In this embodiment, a round spring made of a round wire is used as the coil spring 3, and the small-diameter coil portion 3 of the coil spring 3 is used.
A space is provided on the spiral rod of a.
【００２９】上記のようなコイルばね３を用いることに
より、小径コイル部３ａと内輪１の接触面積が小さく、
螺旋部間に滲出した潤滑油が小径コイル部３ａと内輪１
の接触部間に侵入し易くなり、小径コイル部３ａと内輪
１の接触部を良好に潤滑することができる。By using the coil spring 3 as described above, the contact area between the small diameter coil portion 3a and the inner ring 1 is small,
Lubricating oil that has exuded between the spiral parts is used for the small diameter coil part 3a and the inner ring 1.
It becomes easy to invade between the contact portions of the inner ring 1, and the contact portion between the small diameter coil portion 3a and the inner ring 1 can be satisfactorily lubricated.
【００３０】上記実施例におけるトルクリミッタにおい
て、外輪２を停止させ、内輪１を高速回転させて内輪１
のトルクを測定したところ、図３に示す場合と略同様の
測定結果を得ることができたので、ここでは、その測定
結果の掲載を省略した。In the torque limiter of the above embodiment, the outer ring 2 is stopped and the inner ring 1 is rotated at a high speed to rotate the inner ring 1
When the torque was measured, it was possible to obtain substantially the same measurement result as in the case shown in FIG. 3, so the description of the measurement result was omitted here.
【００３１】[0031]
【発明の効果】以上のように、この発明に係るトルクリ
ミッタにおいては、内輪を焼結体で形成し、その内輪に
潤滑剤を含浸させたので、内輪の外径面に滲出する潤滑
剤によって内輪とコイルばねの接触部を潤滑することが
できる。このため、潤滑剤が攪拌されることはなく、運
転開始時の初期トルクの安定化を図ることができる。As described above, in the torque limiter according to the present invention, since the inner ring is made of a sintered body and the inner ring is impregnated with the lubricant, the lubricant exuding on the outer diameter surface of the inner ring is used. The contact portion between the inner ring and the coil spring can be lubricated. Therefore, the lubricant is not agitated, and the initial torque at the start of operation can be stabilized.
【００３２】潤滑剤としてグリースを用いることによ
り、グリースの油分が内輪表面に徐々に滲出するため、
潤滑剤の保持がよく、潤滑寿命の向上を図ることができ
る。By using grease as the lubricant, the oil content of the grease gradually exudes to the inner ring surface,
The lubricant is retained well and the lubrication life can be improved.
【図１】この発明に係るトルクリミッタの第１の実施例
を示す断面図FIG. 1 is a sectional view showing a first embodiment of a torque limiter according to the present invention.
【図２】この発明に係るトルクリミッタの第２の実施例
を示す断面図FIG. 2 is a sectional view showing a second embodiment of the torque limiter according to the present invention.
【図３】同上トルクリミッタにおける内輪のトルク測定
結果を示すグラフFIG. 3 is a graph showing a torque measurement result of an inner ring in the same torque limiter.
【図４】従来のトルクリミッタを示す断面図FIG. 4 is a sectional view showing a conventional torque limiter.
【図５】従来のトルクリミッタにおける内輪のトルク測
定結果を示すグラフFIG. 5 is a graph showing torque measurement results of the inner ring in the conventional torque limiter.
１ 内輪 ２ 外輪 ３ コイルばね ３ａ 小径コイル部 ４、５ 折曲片 ６ 調整リング 1 Inner ring 2 Outer ring 3 Coil spring 3a Small diameter coil section 4, 5 Bending piece 6 Adjustment ring
Claims (2)
の両輪間に組込まれたコイルばねに前記内輪の外径面を
締付ける小径コイル部を設け、そのコイルばねの両端に
形成された折曲片の一方を外輪に連結し、他方の折曲片
を外輪の開口端部に回転可能に圧入した調整リングに連
結したトルクリミッタにおいて、前記内輪を焼結体で形
成し、その内輪に潤滑剤を含浸させたことを特徴とする
トルクリミッタ。1. An outer ring is rotatably provided on the outer side of an inner ring, a coil spring incorporated between the two rings is provided with a small diameter coil portion for tightening an outer diameter surface of the inner ring, and a folding formed at both ends of the coil spring. In a torque limiter in which one of the bending pieces is connected to the outer ring and the other bending piece is connected to an adjusting ring that is rotatably press-fitted into the open end of the outer ring, the inner ring is formed of a sintered body and the inner ring is lubricated. A torque limiter characterized by being impregnated with a chemical.
から成る請求項１に記載のトルクリミッタ。2. The torque limiter according to claim 1, wherein the lubricant is one of grease and lubricating oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7071434A JPH08270673A (en) | 1995-03-29 | 1995-03-29 | Torque limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7071434A JPH08270673A (en) | 1995-03-29 | 1995-03-29 | Torque limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08270673A true JPH08270673A (en) | 1996-10-15 |
Family
ID=13460435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7071434A Pending JPH08270673A (en) | 1995-03-29 | 1995-03-29 | Torque limiter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08270673A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11108077A (en) * | 1997-09-30 | 1999-04-20 | Ntn Corp | Manufacture of torque transmission device, and its inner ring or free hub |
| JP2006170307A (en) * | 2004-12-15 | 2006-06-29 | Ntn Corp | Torque limiter |
| WO2007114131A1 (en) * | 2006-03-28 | 2007-10-11 | Ntn Corporation | Torque limiter |
| US7318776B2 (en) | 2004-05-24 | 2008-01-15 | Ntn Corporation | Torque limiter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0475231U (en) * | 1990-11-13 | 1992-06-30 | ||
| JPH04307129A (en) * | 1991-04-03 | 1992-10-29 | Fuji Xerox Co Ltd | Torque limiter |
| JPH05126160A (en) * | 1991-10-31 | 1993-05-21 | Ntn Corp | Torque limiter |
| JPH06221341A (en) * | 1993-01-22 | 1994-08-09 | Yamauchi Corp | Torque limiter |
-
1995
- 1995-03-29 JP JP7071434A patent/JPH08270673A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0475231U (en) * | 1990-11-13 | 1992-06-30 | ||
| JPH04307129A (en) * | 1991-04-03 | 1992-10-29 | Fuji Xerox Co Ltd | Torque limiter |
| JPH05126160A (en) * | 1991-10-31 | 1993-05-21 | Ntn Corp | Torque limiter |
| JPH06221341A (en) * | 1993-01-22 | 1994-08-09 | Yamauchi Corp | Torque limiter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11108077A (en) * | 1997-09-30 | 1999-04-20 | Ntn Corp | Manufacture of torque transmission device, and its inner ring or free hub |
| US7318776B2 (en) | 2004-05-24 | 2008-01-15 | Ntn Corporation | Torque limiter |
| JP2006170307A (en) * | 2004-12-15 | 2006-06-29 | Ntn Corp | Torque limiter |
| JP4558474B2 (en) * | 2004-12-15 | 2010-10-06 | Ｎｔｎ株式会社 | Torque limiter |
| WO2007114131A1 (en) * | 2006-03-28 | 2007-10-11 | Ntn Corporation | Torque limiter |
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