JP3421444B2 - Torque limiter - Google Patents
Torque limiterInfo
- Publication number
- JP3421444B2 JP3421444B2 JP23720894A JP23720894A JP3421444B2 JP 3421444 B2 JP3421444 B2 JP 3421444B2 JP 23720894 A JP23720894 A JP 23720894A JP 23720894 A JP23720894 A JP 23720894A JP 3421444 B2 JP3421444 B2 JP 3421444B2
- Authority
- JP
- Japan
- Prior art keywords
- case
- inner ring
- porous
- ring
- coil spring
- 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.)
- Expired - Fee Related
Links
Landscapes
- Controlling Sheets Or Webs (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は、各種の事務機器等に
おける紙の重送防止装置やブレーキ装置などに用いられ
るトルクリミッタに関するものである。
【０００２】
【従来の技術】図２は、従来のこの種のトルクリミッタ
を示している。
【０００３】このトルクリミッタは、軸４が挿通する内
輪１の外側をケース２と蓋板３で覆い、その閉鎖した空
間の内部で、コイルバネ５の一部分を内輪１に巻付け、
そのコイルバネ５の一端をケース２に、他端を蓋板３に
それぞれ係止している。
【０００４】上記の構造では、コイルバネ５の巻付け部
分５ａと内輪１の外径面との間で生じる緊縛力や摩擦力
がコイルバネ５と内輪１を結合又は離反させ、ケース２
と軸４間におけるトルクの伝達と遮断を切換えている。
【０００５】この場合、強い摩擦力が作用するコイルバ
ネ５と内輪１の接触部は、常に潤滑する必要があり、通
常、内輪１とケース２、蓋板３で覆われる閉鎖空間６に
グリースが封入されている。
【０００６】また、内輪１は、全体が焼結金属等の多孔
質材料で形成され、その内部にオイルを含浸させて、潤
滑の補完と接触部における防錆を図っている。
【０００７】
【発明が解決しようとする課題】上記のような従来のト
ルクリミッタでは、潤滑油として閉鎖空間６にグリース
を封入し、内輪１全体にオイルを含浸しているため、ト
ルクリミッタ内部に保有される油分の量が著しく多くな
り、その油分による内圧上昇により保有された潤滑油が
外部に漏出しやすい傾向がある。
【０００８】また、多孔質材料で形成された内輪１の内
径面が直接軸４に接触しているために、トルクリミッタ
内部の潤滑油が、時間の経過とともに内輪１の内部を通
して軸４の表面へにじみ出す問題がある。
【０００９】さらに、内輪１の端面７とケース２の内側
端面８とが密着した状態にあるため、その端面７、８間
に生じる浸透圧によって内部の潤滑油がケース２の外部
に漏れ出しやすい欠点もある。
【００１０】このようなトルクリミッタから漏れ出した
潤滑油は、事務機器内の他の部品や紙等に付着し、安定
した作動を阻害しやすい不具合がある。
【００１１】そこで、この発明は、上記の問題を解決
し、内輪とコイルバネ間の潤滑を良好に維持できると共
に、潤滑油の外部への漏れ出しを確実に防止できるトル
クリミッタを提供することを目的としている。
【００１２】
【課題を解決するための手段】上記の課題を解決するた
め、この発明は、内輪を、非多孔質材料から成るスリー
ブと、そのスリーブの外径面に嵌合する多孔質リングと
から形成し、この多孔質リングの長さを、内輪に対する
コイルバネの巻付き長さとほぼ等しく設定したのであ
る。
【００１３】また、この発明の第２の手段は、上記多孔
質リングとケースの内側端面との間に、油溜り用のすき
間を設けた構造としたのである。
【００１４】
【作用】上記の構造においては、オイルを含浸させる多
孔質リングの大きさを、コイルバネの巻付け長さだけに
ほぼ限定したので、トルクリミッタ内部に保有する潤滑
油の量を少なくでき、油圧力による潤滑油の漏れ出しを
抑えることができる。
【００１５】また、多孔質リングと軸が直接接触せず、
非多孔質のスリーブが間に介在するため、内輪の内部を
通して潤滑油が浸透することがなく、軸表面へのにじみ
出しが防止される。
【００１６】一方、第２の手段のように、多孔質リング
とケースの端面間にすき間を設けると、潤滑油がケース
内部に停滞し、内輪とケースの端面間の浸透圧が低下す
るため、端面を通したケース外部への潤滑油の漏れ出し
が防止される。
【００１７】
【実施例】図１は実施例のトルクリミッタを示してい
る。内輪１は、合成樹脂から形成されるスリーブ９と、
そのスリーブ９の外径面に圧入嵌合される焼結金属製の
多孔質リング１０とから構成され、その多孔質リング１
０の内部にオイルが含浸されている。
【００１８】この多孔質リング１０の外径面には、コイ
ルバネ５の内径面の一部分が巻付けられ、そのコイルバ
ネ５の一端がケース２の端面に、他端が蓋板３の端面に
それぞれ係止されている。
【００１９】上記ケース２や蓋板３は、潤滑油を含浸し
ない合成樹脂で形成され、そのケース２と蓋板３及び内
輪１とで囲まれる閉鎖空間６に、グリースが封入されて
いる。
【００２０】上記多孔質リング１０は、コイルバネ５の
巻付け部分５ａの長さＬより少し大きな長さで形成され
ており、その多孔質リング１０の端面とケース２の内側
端面８との間には、油溜り用のすき間１１が形成されて
いる。
【００２１】なお、スリーブ９の内側には、軸４が挿通
する貫通孔１２が形成され、スリーブ９の端部に、軸４
とスリーブ９間でトルク伝達を行なうキー１３の嵌合溝
１４が設けられている。
【００２２】上記の構造で成る実施例のトルクリミッタ
においては、オイルを含浸する多孔質リング１０を、コ
イルバネ５の巻付け部分５ａの長さだけに縮小したの
で、図２に示す従来構造に比べて内輪１に含浸されるオ
イルの絶対量を少なくすることができる。このため、ト
ルクリミッタ内部に保有される潤滑油が少なくなり、グ
リースとオイル圧力の相乗効果による潤滑油の漏れ出し
を抑えることができる。
【００２３】また、含浸作用のある多孔質リング１０と
軸４が直接接触せず、その間に介在する樹脂製のスリー
ブ９が潤滑油の浸透を遮断するため、潤滑油が内輪１の
内部を通して移動することが防止され、軸４表面へのに
じみ出しが防止される。
【００２４】加えて、多孔質リング１０とケース２の端
面間にすき間１１が設けられ、トルク発生側となるスリ
ーブ９とケース２の端面との間に油溜りとなる空間がで
きるため、閉鎖空間６からケース２外部へ漏れようとす
るグリース又はオイルがすき間１１で停滞した状態にな
る。このため、すき間に生じるラビリンス効果により、
内輪１とケース２の端面７、８間に生じる浸透圧が低下
し、ケース２外部へ漏れ出そうとする潤滑油の動きが止
められる。
【００２５】なお、実施例では、スリーブ９やケース
２、蓋板３を合成樹脂製としたが、これらは潤滑油が浸
透しない材料であればよいため、金属等の他の非多孔質
材料で形成することもできる。
【００２６】
【効果】以上のように、この発明は、内輪において潤滑
油を含浸する多孔質部分の長さをコイルバネの巻付き部
分だけに限定し、その多孔質部分と軸との直接接触を無
くしたので、コイルバネと内輪の接触部分の潤滑状態を
良好に維持しつつ、トルクリミッタ内部に保有する潤滑
油量を少なくすることができ、内輪を通した潤滑油の漏
れ出しを確実に防止することができる。
【００２７】また、第２の手段のように、内輪とケース
の端面間に油溜りとなるすき間を設けると、端面間に生
じる浸透圧を小さくでき、ケースの端面を通した潤滑油
の漏れ出しを防ぐことができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque limiter used for an apparatus for preventing double feed of paper and a brake device in various office equipment and the like. 2. Description of the Related Art FIG. 2 shows a conventional torque limiter of this type. In this torque limiter, the outside of an inner ring 1 through which a shaft 4 is inserted is covered with a case 2 and a cover plate 3, and a part of a coil spring 5 is wound around the inner ring 1 inside the closed space.
One end of the coil spring 5 is locked to the case 2 and the other end is locked to the cover plate 3. In the above structure, the binding or frictional force generated between the wound portion 5a of the coil spring 5 and the outer diameter surface of the inner ring 1 couples or separates the coil spring 5 and the inner ring 1 and the case 2
The transmission and interruption of torque between the shaft 4 and the shaft 4 are switched. In this case, the contact portion between the coil spring 5 where strong frictional force acts and the inner ring 1 needs to be constantly lubricated. Usually, grease is sealed in a closed space 6 covered by the inner ring 1, the case 2 and the cover plate 3. Have been. The inner ring 1 is entirely formed of a porous material such as a sintered metal and impregnated with oil to supplement lubrication and prevent rust at the contact portion. In the conventional torque limiter as described above, grease is sealed in the closed space 6 as lubricating oil, and the entire inner ring 1 is impregnated with oil. The amount of retained oil increases significantly, and the retained lubricating oil tends to leak to the outside due to an increase in internal pressure due to the oil. Further, since the inner diameter surface of the inner ring 1 formed of a porous material is in direct contact with the shaft 4, the lubricating oil inside the torque limiter passes through the inside of the inner ring 1 with the passage of time and the surface of the shaft 4 There is a problem of seepage. Furthermore, since the end face 7 of the inner ring 1 and the inner end face 8 of the case 2 are in close contact with each other, the internal lubricating oil easily leaks out of the case 2 due to the osmotic pressure generated between the end faces 7, 8. There are drawbacks. [0010] Lubricating oil leaked from such a torque limiter adheres to other parts, paper, etc. in office equipment, and tends to hinder stable operation. Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a torque limiter which can maintain good lubrication between the inner ring and the coil spring and can reliably prevent leakage of lubricating oil to the outside. And [0012] In order to solve the above-mentioned problems, the present invention provides an inner ring having a sleeve made of a non-porous material and a porous ring fitted to an outer diameter surface of the sleeve. And the length of the porous ring is set to be substantially equal to the length of the coil spring wound around the inner ring. Further, a second means of the present invention has a structure in which a gap for an oil reservoir is provided between the porous ring and the inner end face of the case. In the above structure, the size of the porous ring impregnated with the oil is substantially limited only to the length of the coil spring, so that the amount of lubricating oil held inside the torque limiter can be reduced. In addition, leakage of lubricating oil due to oil pressure can be suppressed. Also, the porous ring does not directly contact the shaft,
Since the non-porous sleeve is interposed therebetween, the lubricating oil does not penetrate through the inside of the inner ring, and bleeding to the shaft surface is prevented. On the other hand, if a gap is provided between the porous ring and the end face of the case as in the second means, the lubricating oil stagnates inside the case, and the osmotic pressure between the inner ring and the end face of the case is reduced. Leakage of lubricating oil to the outside of the case through the end surface is prevented. FIG. 1 shows a torque limiter according to an embodiment. The inner ring 1 includes a sleeve 9 formed of a synthetic resin,
A sintered metal porous ring 10 press-fitted onto the outer diameter surface of the sleeve 9.
0 is impregnated with oil. A part of the inner diameter surface of the coil spring 5 is wound around the outer diameter surface of the porous ring 10. One end of the coil spring 5 is connected to the end surface of the case 2, and the other end is connected to the end surface of the cover plate 3. Has been stopped. The case 2 and the cover plate 3 are formed of a synthetic resin not impregnated with lubricating oil, and grease is sealed in a closed space 6 surrounded by the case 2, the cover plate 3 and the inner ring 1. The porous ring 10 is formed to have a length slightly larger than the length L of the winding portion 5 a of the coil spring 5, and between the end face of the porous ring 10 and the inner end face 8 of the case 2. Has a gap 11 for an oil reservoir. A through hole 12 through which the shaft 4 is inserted is formed inside the sleeve 9.
A fitting groove 14 of the key 13 for transmitting torque between the key 9 and the sleeve 9 is provided. In the torque limiter of the embodiment having the above structure, the porous ring 10 impregnated with the oil is reduced to the length of the winding portion 5a of the coil spring 5, so that the structure is smaller than the conventional structure shown in FIG. Thus, the absolute amount of oil impregnated in the inner ring 1 can be reduced. Therefore, the amount of lubricating oil retained inside the torque limiter is reduced, and leakage of lubricating oil due to the synergistic effect of grease and oil pressure can be suppressed. Further, since the porous ring 10 having an impregnating action does not directly contact the shaft 4 and the resin sleeve 9 interposed therebetween blocks the penetration of the lubricating oil, the lubricating oil moves through the inner ring 1. Bleeding to the surface of the shaft 4 is prevented. In addition, a gap 11 is provided between the porous ring 10 and the end face of the case 2, and a space serving as an oil reservoir is formed between the sleeve 9 on the torque generating side and the end face of the case 2. Grease or oil that is about to leak from case 6 to the outside of case 2 stagnates in gap 11. Therefore, due to the labyrinth effect that occurs in the gap,
The osmotic pressure generated between the inner ring 1 and the end surfaces 7 and 8 of the case 2 is reduced, and the movement of the lubricating oil that tends to leak out of the case 2 is stopped. In the embodiment, the sleeve 9, the case 2, and the cover plate 3 are made of a synthetic resin. However, these materials may be made of any non-porous material such as a metal because they may be made of a material that does not penetrate the lubricating oil. It can also be formed. As described above, the present invention limits the length of the porous portion impregnated with the lubricating oil in the inner ring to only the wound portion of the coil spring, and prevents direct contact between the porous portion and the shaft. Since it has been eliminated, the amount of lubricating oil held inside the torque limiter can be reduced while maintaining good lubrication at the contact portion between the coil spring and the inner ring, and leakage of lubricating oil through the inner ring is reliably prevented. be able to. Further, when a gap serving as an oil reservoir is provided between the inner ring and the end face of the case as in the second means, the osmotic pressure generated between the end faces can be reduced, and the leakage of lubricating oil through the end face of the case can be reduced. Can be prevented.
【図面の簡単な説明】 【図１】実施例のトルクリミッタを示す縦断面図 【図２】従来例を示す縦断面図 【符号の説明】 １ 内輪 ２ ケース ３ 蓋板 ４ 軸 ５ コイルバネ ６ 閉鎖空間 ７、８ 端面 ９ スリーブ １０ 多孔質リング １１ すき間[Brief description of the drawings] FIG. 1 is a longitudinal sectional view showing a torque limiter of an embodiment. FIG. 2 is a longitudinal sectional view showing a conventional example. [Explanation of symbols] 1 inner ring 2 cases 3 lid plate 4 axes 5 Coil spring 6 closed space 7, 8 end face 9 sleeve 10. Porous ring 11 gap
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F16D 7/02 F16D 13/08 F16D 43/20 F16H 35/10 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) F16D 7/02 F16D 13/08 F16D 43/20 F16H 35/10
Claims (1)
板で覆って密閉された潤滑空間を形成し、内輪に一部分
を巻付けたコイルバネの一端をケースに、他端を蓋板に
それぞれ係止したトルクリミッタにおいて、上記内輪
を、非多孔質材料から成るスリーブと、そのスリーブの
外径面に嵌合する多孔質リングとから形成し、この多孔
質リングの外径面に上記コイルバネの内径面の一部を巻
付け、その多孔質リングの長さを、上記コイルバネの巻
付き長さとほぼ等しく設定し、上記多孔質リングの端面
とケースの内側端面との間に、油溜り用のすき間を設け
たことを特徴とするトルクリミッタ。(57) [Claims 1] A closed lubricating space is formed by covering the outside of an inner ring through which a shaft passes with a case and a cover plate, and one end of a coil spring partially wound around the inner ring. In a torque limiter having a case and the other end locked to a lid plate, the inner ring is formed of a sleeve made of a non-porous material and a porous ring fitted to an outer diameter surface of the sleeve. Part of the inner surface of the coil spring is wound around the outer surface of the
With, the length of the porous ring, almost equal to the winding length of the coil spring, the end surface of the porous ring
A gap for oil reservoir is provided between the torque limiter and the inner end surface of the case .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23720894A JP3421444B2 (en) | 1994-09-30 | 1994-09-30 | Torque limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23720894A JP3421444B2 (en) | 1994-09-30 | 1994-09-30 | Torque limiter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08100825A JPH08100825A (en) | 1996-04-16 |
| JP3421444B2 true JP3421444B2 (en) | 2003-06-30 |
Family
ID=17011990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23720894A Expired - Fee Related JP3421444B2 (en) | 1994-09-30 | 1994-09-30 | Torque limiter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3421444B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5913634B2 (en) * | 2014-04-21 | 2016-04-27 | オリジン電気株式会社 | Torque limiter |
| CN111792448B (en) * | 2020-07-31 | 2022-04-22 | 国网内蒙古东部电力有限公司建设分公司 | Winding device for cable erection |
-
1994
- 1994-09-30 JP JP23720894A patent/JP3421444B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08100825A (en) | 1996-04-16 |
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