JP2015166609A - Speed reducer - Google Patents

Speed reducer Download PDF

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Publication number
JP2015166609A
JP2015166609A JP2014041102A JP2014041102A JP2015166609A JP 2015166609 A JP2015166609 A JP 2015166609A JP 2014041102 A JP2014041102 A JP 2014041102A JP 2014041102 A JP2014041102 A JP 2014041102A JP 2015166609 A JP2015166609 A JP 2015166609A
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Prior art keywords
housing
end cover
opening
shaft end
oil seal
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JP6120409B2 (en
Inventor
宗博 木村
Munehiro Kimura
宗博 木村
潤一 坪田
Junichi Tsubota
潤一 坪田
里司 椎野
Satoshi Shiino
里司 椎野
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Tsubaki E&M Co
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Tsubaki E&M Co
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Priority to JP2014041102A priority Critical patent/JP6120409B2/en
Priority to CN201510030431.7A priority patent/CN104896073B/en
Publication of JP2015166609A publication Critical patent/JP2015166609A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/031—Gearboxes; Mounting gearing therein characterised by covers or lids for gearboxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness

Abstract

PROBLEM TO BE SOLVED: To provide a speed reducer which facilitates the attaching/detaching of a shaft end cover, prevents the shaft end cover from unexpectedly coming off, and requiring a comparatively inexpensive manufacturing cost.SOLUTION: In a speed reducer 10, on a wall portion 12a on a side to which an end portion 14b of a hollow output shaft 14 of a housing 12 exposes, a circular opening portion 20 coaxial with the hollow output shaft 14 and having diametrical dimensions not less than an outer dimeter of an oil seal 18 is provided. In a circumferential direction of an edge of the opening portion 20, a non-continuous projection strip portion 16 projecting out from an outer wall surface 12b of the wall portion 12a is provided. A shaft end cover 22 is fitted in the opening portion 20. A surface 22a of the shaft end cover 22 is positioned between an end surface 16a of the projecting strip portion 16 and the outer wall surface 12b of the wall portion 12a, so that the shaft end cover 22 can be easily attached/detached and prevented from unexpectedly coming off, and a manufacturing cost is comparatively inexpensive.

Description

本発明は、端部がハウジングから露出している回転軸の当該端部を覆うためのカバー（以下、単に、「軸端部カバー」という。）が、当該端部が露出する側のハウジングの壁部に装着される減速機に関する。   In the present invention, a cover for covering the end of the rotating shaft whose end is exposed from the housing (hereinafter simply referred to as “shaft end cover”) is provided on the housing on the side where the end is exposed. The present invention relates to a reduction gear mounted on a wall.

減速機には、回転軸の端部がハウジングから露出しているものがある。例えば、中空の最終出力軸がハウジングを貫通しているタイプのものがこれに当たる。その他、保守等の便宜上の目的で、ハウジングの回転軸の端部に対応する位置に孔が設けられた減速機もこれに当たる。   Some reduction gears have the end of the rotating shaft exposed from the housing. For example, this is the type in which the hollow final output shaft passes through the housing. In addition, a reduction gear provided with a hole at a position corresponding to the end portion of the rotating shaft of the housing corresponds to this for the purpose of maintenance and the like.

回転軸の端部がハウジングから露出している場合、回転中の回転軸に接触して怪我をする恐れがあり、また、回転軸への接触が原因で事故が起こるという危険性もある。そこで、ハウジングから露出している回転軸の端部を覆うためのカバーをハウジングに取付けることが行われており、そのようなカバーを有する減速機の例として、特許文献１に示すものがある。   If the end of the rotating shaft is exposed from the housing, there is a risk of injury due to contact with the rotating rotating shaft, and there is a risk that an accident may occur due to contact with the rotating shaft. Therefore, a cover for covering the end of the rotating shaft exposed from the housing is attached to the housing, and an example of a speed reducer having such a cover is disclosed in Patent Document 1.

特開２０１２−１２７４７０号公報JP 2012-127470 A

特許文献１には、サブカバーが、回転軸の端部が露出する側のハウジングの壁部に取付けられている減速機が開示されている。当該回転軸は、サンギアが形成された入力軸であり、サブカバーを取外すことによって、その入力軸を抜くことができ、これにより、入力軸の引抜用の治具を別途備えておく必要がない、とされている。   Patent Document 1 discloses a reduction gear in which a sub cover is attached to a wall portion of a housing on a side where an end portion of a rotating shaft is exposed. The rotating shaft is an input shaft on which a sun gear is formed. By removing the sub cover, the input shaft can be pulled out, so that it is not necessary to separately provide a jig for pulling out the input shaft. It is said that.

軸端部カバーは、回転軸の端部が露出しないように、不意に外れないことが望ましい。この点、引用文献１におけるサブカバーは、複数のボルトによって取付けられているから、カバーが不意に外れることはないという利点は有する。しかし、その着脱には手間が掛かるという問題がある。また、ボルト取付の場合、カバーだけでなく、ハウジング側にもボルト取付のための加工が必要になるので、製造コストが掛かるという問題もある。   It is desirable that the shaft end cover is not accidentally removed so that the end of the rotating shaft is not exposed. In this respect, since the sub cover in the cited document 1 is attached by a plurality of bolts, there is an advantage that the cover does not come off unexpectedly. However, there is a problem that it takes time to attach and detach. Further, in the case of bolt mounting, since the processing for bolt mounting is required not only on the cover but also on the housing side, there is a problem that the manufacturing cost is increased.

そこで、本発明は、前述した従来技術の問題点に鑑み、軸端部カバーの着脱が簡単で、軸端部カバーが不意に外れることがなく、製造コストが比較的掛からない減速機を提供することをその目的とする。   In view of the above-described problems of the prior art, the present invention provides a speed reducer in which the shaft end cover can be easily attached and detached, the shaft end cover does not come off unexpectedly, and the manufacturing cost is relatively low. That is the purpose.

本発明は、ハウジングと、少なくとも一方の端部が前記ハウジングから露出する回転軸と、前記ハウジングに取付けられ、前記端部を覆う軸端部カバーを有する減速機において、
前記端部が前記ハウジングの内側に位置し、且つ、前記ハウジングに嵌合してその内部を密封するオイルシールを具え、
前記端部が露出する側の前記ハウジングの壁部が、前記回転軸と同軸で、且つ、前記オイルシールの外径以上の開口部を有し、
前記開口部が、その縁の周方向に前記壁部の外壁面より突出した非連続の突条部を具え、
前記軸端部カバーが、その表面が前記突条部の端面と前記外壁面との間に位置するように前記開口部に嵌込まれていることを特徴とする減速機によって前記課題を解決した。 The present invention relates to a speed reducer having a housing, a rotating shaft having at least one end exposed from the housing, and a shaft end cover attached to the housing and covering the end.
The end is located inside the housing, and includes an oil seal that fits into the housing and seals the interior;
The wall portion of the housing on the side where the end portion is exposed has an opening that is coaxial with the rotation shaft and has an outer diameter equal to or greater than the outer diameter of the oil seal;
The opening includes a discontinuous ridge protruding from the outer wall surface of the wall in the circumferential direction of the edge;
The shaft end cover is fitted in the opening so that the surface thereof is positioned between the end surface of the ridge and the outer wall surface, and the problem is solved by a speed reducer. .

本発明によれば、軸端部カバーを開口部に嵌込むだけで、露出していた回転軸の端部を覆うことができるので、軸端部カバーの取付が容易である。また、軸端部カバーの表面が突条部の端面とハウジングの外壁面との間に位置しており、且つ、突条部は非連続であるため、突条部が途切れている部分には、軸端部カバーの側面が露出する。この軸端部カバーの側面にマイナスドライバ等の先端を当てれば、軸端部カバーに対しハウジングの外側に向けた力を簡単に加えることができ、軸端部カバーを容易に外すことができる。このように、本発明の減速機によれば、軸端部カバーの着脱を容易に行うことができるので、メインテナンス等の作業が簡便に行える。   According to the present invention, the exposed end of the rotating shaft can be covered only by fitting the shaft end cover into the opening, so that the shaft end cover can be easily attached. Further, since the surface of the shaft end cover is located between the end surface of the ridge and the outer wall surface of the housing, and the ridge is discontinuous, The side surface of the shaft end cover is exposed. If a tip of a flathead screwdriver or the like is applied to the side surface of the shaft end cover, a force toward the outside of the housing can be easily applied to the shaft end cover, and the shaft end cover can be easily removed. Thus, according to the speed reducer of the present invention, the shaft end cover can be easily attached and detached, so that maintenance and other operations can be easily performed.

また、開口部がその周方向に外壁面より突出した突条部を具え、軸端部カバーの表面が突条部の端面と外壁面との間に位置しているから、例えば、人が減速機に接触した場合であっても、突条部が壁となり、人が軸端部カバーに不意に接してしまうということを防ぐことができるので、その結果、軸端部カバーが不意に外れてしまうということを防ぐことができる。   In addition, since the opening includes a protruding portion protruding from the outer wall surface in the circumferential direction, and the surface of the shaft end cover is located between the end surface of the protruding portion and the outer wall surface, for example, a person decelerates. Even if it is in contact with the machine, the ridges become walls and prevent people from touching the shaft end cover unexpectedly, so that the shaft end cover can be removed unexpectedly. Can be prevented.

また、軸端部カバーは、開口部に嵌込むだけでハウジングに取付けられるので、軸端部カバー及びハウジングに、従来のような、固定用のボルト孔等を設ける必要はない。よって、製造コストを比較的抑えることができる。   Further, since the shaft end cover is attached to the housing simply by being fitted into the opening, it is not necessary to provide a fixing bolt hole or the like in the shaft end cover and the housing as in the prior art. Therefore, the manufacturing cost can be relatively suppressed.

また、開口部の径をオイルシールの外径よりも大きくし、ハウジングの開口部からオイルシールまでの内周壁部にハウジングの外側に向けて拡開するテーパ面を設ければ、軸端部カバーを開口部に嵌め易くなる。なお、同構成は、抜き勾配になるから、鋳造法でのハウジングの製造にも適している。   Also, if the diameter of the opening is made larger than the outer diameter of the oil seal and a tapered surface that expands toward the outside of the housing is provided on the inner peripheral wall from the opening of the housing to the oil seal, the shaft end cover Can be easily fitted into the opening. In addition, since this structure becomes a draft, it is suitable also for manufacture of the housing by a casting method.

また、開口部の径をオイルシールの外径よりも大きくし、ハウジングの開口部からオイルシールまでの内周壁部に、軸端部カバーが開口部に嵌込まれたときに軸端部カバーの裏面が当接する、その径方向外側に向かう一段の段部を有する構成とすれば、軸端部カバーの取付が簡便に行え、また、軸端部カバーを嵌込むときに、軸端部カバーがオイルシールに当たり、オイルシールに不要な軸方向の力が掛かるということを防ぐことができる。また、軸端部カバーをハウジング内部の奥まで嵌込みすぎてしまうという不都合も防止できるので好適である。   In addition, the diameter of the opening is made larger than the outer diameter of the oil seal, and when the shaft end cover is fitted into the opening on the inner peripheral wall from the housing opening to the oil seal, the shaft end cover If the back surface abuts and has a stepped step toward the outside in the radial direction, the shaft end cover can be easily attached, and when the shaft end cover is fitted, the shaft end cover It is possible to prevent an unnecessary axial force from being applied to the oil seal when it hits the oil seal. In addition, it is possible to prevent the inconvenience that the shaft end cover is fitted too far into the housing.

また、開口部の径をオイルシールの外径よりも大きくし、ハウジングの開口部からオイルシールまでの内周壁部に、軸端部カバーが開口部に嵌込まれたときに軸端部カバーの裏面が当接する、その径方向外側に向かう一段の段部を有する構成とし、さらに、ウジングの開口部からオイルシールまでの内周壁部にハウジングの外側に向けて拡開するテーパ面を設ければ、当該構成による、前述した効果の両方を得ることができる。   In addition, the diameter of the opening is made larger than the outer diameter of the oil seal, and when the shaft end cover is fitted into the opening on the inner peripheral wall from the housing opening to the oil seal, the shaft end cover If the back surface is in contact with the first stepped portion toward the outside in the radial direction, and further provided with a tapered surface that expands toward the outside of the housing on the inner peripheral wall portion from the opening of the udging to the oil seal Both of the effects described above can be obtained by the configuration.

（ａ）は、本発明の第一実施形態の正面図、（ｂ）はその側面図。(A) is a front view of 1st embodiment of this invention, (b) is the side view. 本発明の第一実施形態の軸端部カバーの着脱を説明する、要部の径方向断面図。Radial direction sectional drawing of the principal part explaining attachment or detachment of the shaft end part cover of 1st embodiment of this invention. 本発明の第二実施形態の要部の径方向断面図。Radial direction sectional drawing of the principal part of 2nd embodiment of this invention. （ａ）は、本発明の第三実施形態の正面図、（ｂ）は、本発明の第四実施形態の正面図。(A) is a front view of 3rd embodiment of this invention, (b) is a front view of 4th embodiment of this invention.

本発明の実施例を図１〜４を参照して説明する。但し、本発明はこの実施形態に限定されるものではない。   An embodiment of the present invention will be described with reference to FIGS. However, the present invention is not limited to this embodiment.

図１（ａ）に示すように、本発明の減速機１０は、ハウジング１２にモータＭが連結され、モータＭからのトルクを伝達する中空出力軸１４を有している。図１（ｂ）に示すように、中空出力軸１４は、ハウジング１２を貫通しており、中空出力軸１４の一方の端部１４ａに被駆動軸（図示省略。）が挿入される。一方、中空出力軸１４の他方の端部１４ｂ（端面を含む。）はハウジング１２の内側に位置しているが、ハウジング１２から露出する。図１（ａ）に示すように、ハウジング１２には、中空出力軸１４の端部１４ｂが露出する側の壁部１２ａに、中空出力軸１４と同軸で円形の開口部２０が設けられている。開口部２０の縁の周方向には、壁部１２ａの外壁面１２ｂより突出した非連続の突条部１６が設けられている（図１（ｂ）も参照。）。開口部２０には、軸端部カバー２２が嵌め込まれており、図１（ｂ）に示すように、軸端部カバー２２の表面２２ａは、突条部１６の端面１６ａと壁部１２ａの外壁面１２ｂとの間に位置している。   As shown in FIG. 1A, the speed reducer 10 of the present invention has a hollow output shaft 14 to which a motor M is coupled to a housing 12 and torque from the motor M is transmitted. As shown in FIG. 1B, the hollow output shaft 14 passes through the housing 12, and a driven shaft (not shown) is inserted into one end portion 14 a of the hollow output shaft 14. On the other hand, the other end 14 b (including the end face) of the hollow output shaft 14 is located inside the housing 12, but is exposed from the housing 12. As shown in FIG. 1A, the housing 12 is provided with a circular opening 20 coaxially with the hollow output shaft 14 on the wall 12 a on the side where the end 14 b of the hollow output shaft 14 is exposed. . In the circumferential direction of the edge of the opening 20, a discontinuous ridge 16 protruding from the outer wall 12b of the wall 12a is provided (see also FIG. 1B). A shaft end cover 22 is fitted in the opening 20, and as shown in FIG. 1B, the surface 22a of the shaft end cover 22 is located outside the end surface 16a of the protrusion 16 and the wall 12a. It is located between the wall surface 12b.

次に、図２を用いて、減速機１０の要部について説明する。図２は、中空出力軸１４の端部１４ｂが露出する側の壁部１２ａの要部の径方向断面図であり、図２（ａ）は、軸端部カバー２２の装着前の状態を、図２（ｂ）は、軸端部カバー２２の装着後の状態を表している。中空出力軸１４は、ハウジング１２内部に設けられている軸受１８に回転可能に軸支されており、軸受１８よりもハウジング１２の外側には、オイルシール２８が具えられている。オイルシール２８は、ハウジング１２の内周壁部１２ｃと中空出力軸１４の外周面とに密着し、ハウジング内部を密封している。オイルシール２８よりもさらにハウジング１２の外側に設けられる開口部２０には、開口部２０と略同径の軸端部カバー２２が嵌込まれる。軸端部カバー２２としては、図示しているような径方向断面コ字状のもの、或いは円柱状のものを使用することができる。このように、軸端部カバー２２が、ハウジング１２内部を密封するオイルシール２８よりもハウジング１２の外側に位置しているため、減速機１０が稼働し、ハウジング１２の内部の圧力が高まった場合でも、軸端部カバー２２には内圧が掛からない。かくして、軸端部カバー２２の取付構造を、ハウジング１２の開口部２０に嵌込むだけという簡素な構造とすることができる。なお、軸端部カバー２２は、減速機１０の稼働時の振動や、ハウジング１２の熱膨張によって外れないようにするために、ハウジング１２の内周壁部１２ｃとの関係で摩擦係数が高い素材で覆われているものや、これを実現できる構造のものとするのがよい。このように、軸端部カバー２２は、開口部２０に嵌込むだけでハウジング１２に簡単に取付けることができ、ボルト等の特別な取付手段を要しないから、製造コストを比較的抑えることができる。   Next, the principal part of the reduction gear 10 is demonstrated using FIG. FIG. 2 is a radial cross-sectional view of the main part of the wall 12a on the side where the end 14b of the hollow output shaft 14 is exposed, and FIG. 2 (a) shows a state before the shaft end cover 22 is mounted. FIG. 2B shows a state after the shaft end cover 22 is mounted. The hollow output shaft 14 is rotatably supported by a bearing 18 provided inside the housing 12, and an oil seal 28 is provided outside the housing 12 relative to the bearing 18. The oil seal 28 is in close contact with the inner peripheral wall portion 12c of the housing 12 and the outer peripheral surface of the hollow output shaft 14, and seals the inside of the housing. A shaft end cover 22 having substantially the same diameter as the opening 20 is fitted into the opening 20 provided further outside the housing 12 than the oil seal 28. As the shaft end cover 22, it is possible to use a U-shaped one in the radial direction cross section as shown in the figure, or a cylindrical one. As described above, since the shaft end cover 22 is positioned outside the housing 12 with respect to the oil seal 28 that seals the inside of the housing 12, the speed reducer 10 operates and the pressure inside the housing 12 increases. However, no internal pressure is applied to the shaft end cover 22. Thus, the mounting structure of the shaft end cover 22 can be a simple structure that only fits into the opening 20 of the housing 12. The shaft end cover 22 is made of a material having a high friction coefficient in relation to the inner peripheral wall portion 12c of the housing 12 so that the shaft end cover 22 does not come off due to vibration during operation of the speed reducer 10 or thermal expansion of the housing 12. It is preferable to have a covered structure or a structure that can realize this. As described above, the shaft end cover 22 can be easily attached to the housing 12 simply by fitting into the opening 20, and no special attachment means such as a bolt is required, so that the manufacturing cost can be relatively suppressed. .

一方、詳しくは後述するが、本発明は、軸端部カバー２２の表面２２ａが、軸端部カバー２２が開口部２０に嵌込まれたときに、突条部１６の端面１６ａと壁部１２ａの外壁面１２ｂとの間に位置するように構成されている。この構成により、軸端部カバー２２が突条部１６よりも出っ張ることがないから、例えば、人が軸端部カバー２２に接触し、軸端部カバー２２が不意に外れてしまうというようなことを防ぐことができる。また、図１（ｂ）に示すように、軸端部カバー２２の側面２２ｂが、突条部１６が途切れている部分に露出するので、その側面２２ｂにマイナスドライバ等の先端を当てれば、軸端部カバー２２に対しハウジング１２の外側に向けた力を簡単に加えることができ、軸端部カバー２２を容易に外すことができる。   On the other hand, as will be described in detail later, in the present invention, when the surface 22a of the shaft end cover 22 is fitted into the opening 20, the end surface 16a of the protrusion 16 and the wall portion 12a. It is comprised so that it may be located between the outer wall surfaces 12b. With this configuration, the shaft end cover 22 does not protrude beyond the ridge portion 16, so that, for example, a person contacts the shaft end cover 22, and the shaft end cover 22 is unexpectedly removed. Can be prevented. Further, as shown in FIG. 1 (b), the side surface 22b of the shaft end cover 22 is exposed at a portion where the protruding portion 16 is interrupted, so that if the tip of a minus driver or the like is applied to the side surface 22b, the shaft A force directed to the outside of the housing 12 can be easily applied to the end cover 22, and the shaft end cover 22 can be easily removed.

また、図２（ａ）に示すように、ハウジング１２の開口部２０からオイルシール１８までの内周壁部１２ｃは、その径方向外側に向かう一段の段部２４を具えている。段部２４は、軸端部カバー２２が開口部２０に嵌込まれたときに、軸端部カバー２２の裏面２２ｃが当接するもので、軸端部カバー２２の裏面２２ｃが段部２４に当接したときに、軸端部カバー２２の表面２２ａが、突条部１６の端面１６ａと壁部１２ａの外壁面１２ｂとの間に位置するように構成されている。この構成によれば、軸端部カバー２２を取付ける際、その裏面２２ｃが段部２４に当接するまで開口部２０に嵌込めばよいので、段部２４を設けない構成に比べて、軸端部カバー２２の取付を簡便に行うことができ、また、軸端部カバー２２がオイルシール２８に当たり、オイルシール２８に不要な軸方向の力が掛かるということを防止できる。   As shown in FIG. 2A, the inner peripheral wall portion 12c from the opening 20 of the housing 12 to the oil seal 18 includes a stepped portion 24 that extends outward in the radial direction. The step portion 24 is configured such that when the shaft end cover 22 is fitted into the opening 20, the back surface 22 c of the shaft end cover 22 abuts, and the back surface 22 c of the shaft end cover 22 contacts the step portion 24. When contacted, the surface 22a of the shaft end cover 22 is configured to be positioned between the end surface 16a of the ridge 16 and the outer wall surface 12b of the wall 12a. According to this configuration, when the shaft end cover 22 is attached, the shaft end portion may be inserted into the opening 20 until the back surface 22c contacts the step portion 24. Therefore, the shaft end portion is compared with the configuration in which the step portion 24 is not provided. The cover 22 can be easily attached, and it is possible to prevent the shaft end cover 22 from hitting the oil seal 28 and applying unnecessary axial force to the oil seal 28.

また、図３に示すように、ハウジング１２の開口部２０からオイルシール１８までの内周壁部１２ｃに、ハウジング１２の外側に拡開するテーパ面１２ｄを設けることもできる。これにより、軸端部カバー２２を開口部２０に嵌め易くなる。また、当該構成は、抜き勾配になるから、鋳造法でのハウジング１２の製造にも適している。さらに、ハウジング１２の開口部２０からオイルシール１８までの内周壁部１２ｃに段部２４を設けた上で、開口部２０から段部２４までの内周壁部にテーパ面１２ｄを設けることもできる。これにより、テーパ面１２ｄと段部２４による双方の効果を奏することができる。   Further, as shown in FIG. 3, a tapered surface 12 d that expands to the outside of the housing 12 can be provided on the inner peripheral wall portion 12 c from the opening 20 of the housing 12 to the oil seal 18. This makes it easier to fit the shaft end cover 22 into the opening 20. Moreover, since the said structure becomes a draft, it is suitable also for manufacture of the housing 12 by a casting method. Furthermore, after providing the step part 24 in the inner peripheral wall part 12c from the opening part 20 of the housing 12 to the oil seal 18, the taper surface 12d can also be provided in the inner peripheral wall part from the opening part 20 to the step part 24. Thereby, both effects by the taper surface 12d and the step part 24 can be produced.

ハウジング１２の開口部２０の径方向寸法は、オイルシール１８の外径Ｄ以上の寸法である必要がある。外径Ｄ以下であると、オイルシール１８をハウジング１２の外側から嵌込むことができないからである。段部２４又はテーパ面１２ｄを設けた場合、ハウジング１２の開口部２０の径方向寸法は、必然的に、オイルシール１８の外径Ｄよりも大きくなる（寸法Ｅ，Ｆ参照。）。軸端部カバー２２は、軸端部カバー２２が開口部２０に嵌込まれたときに、ハウジング１２の内周壁部１２ｃ又はテーパ面１２ｄと摩擦係合して、ハウジング１２から脱落しない程度の径方向寸法Ａを有し、且つ、その表面２２ａが壁部１２ａの外壁面１２ｂと突条部１６の端面１６ａとの間（矢印Ｃの範囲内）に位置する軸方向寸法Ｂ（軸端部カバー２２の表面２２ａから裏面２２ｃまでの寸法）を有するものが使用される。なお、軸端部カバー２２の表面２２ａの位置は、突条部１６の端面１６ａと一致していてもよいが、壁部１２ａの外壁面１２ｂよりはハウジング１２の外側に位置している必要がある。   The dimension in the radial direction of the opening 20 of the housing 12 needs to be larger than the outer diameter D of the oil seal 18. This is because the oil seal 18 cannot be fitted from the outside of the housing 12 when the outer diameter is equal to or smaller than D. When the stepped portion 24 or the tapered surface 12d is provided, the radial dimension of the opening 20 of the housing 12 is necessarily larger than the outer diameter D of the oil seal 18 (see dimensions E and F). The shaft end cover 22 has a diameter such that when the shaft end cover 22 is fitted into the opening 20, the shaft end cover 22 frictionally engages with the inner peripheral wall portion 12 c or the tapered surface 12 d of the housing 12 and does not fall off from the housing 12. An axial dimension B (shaft end cover) having a directional dimension A and whose surface 22a is located between the outer wall surface 12b of the wall 12a and the end face 16a of the ridge 16 (in the range of the arrow C). 22 having dimensions from the front surface 22a to the back surface 22c). The position of the surface 22a of the shaft end cover 22 may coincide with the end surface 16a of the ridge portion 16, but it needs to be positioned outside the housing 12 rather than the outer wall surface 12b of the wall portion 12a. is there.

なお、突条部は、非連続のものであればよく、例えば、図４（ａ），（ｂ）に示すような、等間隔で３つの突条部１６′、等間隔で４つの突条部１６′′としてもよい。   In addition, the protrusion part should just be a discontinuous thing, for example, as shown to Fig.4 (a), (b), it is three protrusion part 16 'at equal intervals, and four protrusions at equal intervals. It is good also as a part 16 ''.

以上、最終出力軸である中空出力軸がハウジングの外部に露出している減速機の例で説明したが、本発明は、この他にも、減速機内部に設けられ、その端部がハウジングの外部に露出する回転軸を有する減速機にも適用可能である。   As described above, the example of the speed reducer in which the hollow output shaft that is the final output shaft is exposed to the outside of the housing has been described, but the present invention is also provided inside the speed reducer, and the end portion of the speed reducer is the housing. The present invention can also be applied to a reduction gear having a rotating shaft exposed to the outside.

以上説明したように、本発明によれば、軸端部カバーの着脱が簡単で、軸端部カバーが不意に外れることがなく、製造コストが比較的掛からない減速機を提供することができる。   As described above, according to the present invention, it is possible to provide a reduction gear in which the shaft end cover can be easily attached and detached, the shaft end cover is not removed unexpectedly, and the manufacturing cost is relatively low.

１０〜１０ｃ 減速機
１２ ハウジング
１２ａ 壁部
１２ｂ 外壁面
１２ｃ 内周壁部
１２ｄ テーパ面
１４ 回転軸（中空出力軸）
１４ｂ 端部
１６ 突条部
１６ａ 突条部の端面
２０ 開口部
２２ 軸端部カバー
２２ａ 軸端部カバーの表面
２２ｃ 軸端部カバーの表面
２４ 段部
２８ オイルシール 10 to 10c Reducer 12 Housing 12a Wall portion 12b Outer wall surface 12c Inner peripheral wall portion 12d Tapered surface 14 Rotating shaft (hollow output shaft)
14b End portion 16 Projection portion 16a End surface of projection portion 20 Opening portion 22 Shaft end cover 22a Surface of shaft end cover 22c Surface of shaft end cover 24 Step portion 28 Oil seal

Claims (4)

ハウジングと、少なくとも一方の端部が前記ハウジングから露出する回転軸と、前記ハウジングに取付けられ、前記端部を覆う軸端部カバーを有する減速機において、
前記端部が前記ハウジングの内側に位置し、且つ、前記ハウジングに嵌合してその内部を密封するオイルシールを具え、
前記端部が露出する側の前記ハウジングの壁部が、前記回転軸と同軸で、且つ、前記オイルシールの外径以上の開口部を有し、
前記開口部が、その縁の周方向に前記壁部の外壁面より突出した非連続の突条部を具え、
前記軸端部カバーが、その表面が前記突条部の端面と前記外壁面との間に位置するように前記開口部に嵌込まれていることを特徴とする、
減速機。 In a speed reducer having a housing, a rotating shaft with at least one end exposed from the housing, and a shaft end cover attached to the housing and covering the end,
The end is located inside the housing, and includes an oil seal that fits into the housing and seals the interior;
The wall portion of the housing on the side where the end portion is exposed has an opening that is coaxial with the rotation shaft and has an outer diameter equal to or greater than the outer diameter of the oil seal;
The opening includes a discontinuous ridge protruding from the outer wall surface of the wall in the circumferential direction of the edge;
The shaft end cover is fitted into the opening so that the surface thereof is located between the end surface of the ridge and the outer wall surface,
Decelerator. 前記開口部の径が前記オイルシールの外径よりも大きく、
前記ハウジングの前記開口部からオイルシールまでの内周壁部が該ハウジングの外側に拡開するテーパ面を有する、請求項１の減速機。 The diameter of the opening is larger than the outer diameter of the oil seal;
The speed reducer according to claim 1, wherein an inner peripheral wall portion from the opening of the housing to the oil seal has a tapered surface that expands outward of the housing. 前記開口部の径が前記オイルシールの外径よりも大きく、
前記ハウジングの前記開口部からオイルシールまでの内周壁部が、前記軸端部カバーが前記開口部に嵌込まれたときに該軸端部カバーの裏面が当接する、その径方向外側に向かう一段の段部を有する、請求項１の減速機。 The diameter of the opening is larger than the outer diameter of the oil seal;
The inner peripheral wall portion from the opening of the housing to the oil seal is one step toward the radially outer side where the back surface of the shaft end cover abuts when the shaft end cover is fitted into the opening. The speed reducer according to claim 1, further comprising: 前記開口部の径が前記オイルシールの外径よりも大きく、
前記ハウジングの前記開口部からオイルシールまでの内周壁部が、前記軸端部カバーが前記開口部に嵌込まれたときに該軸端部カバーの裏面が当接する、その径方向外側に向かう一段の段部を有し、
前記ハウジングの前記開口部から前記段部までの内周壁部が該ハウジングの外側に拡開するテーパ面を有する、請求項１の減速機。 The diameter of the opening is larger than the outer diameter of the oil seal;
The inner peripheral wall portion from the opening of the housing to the oil seal is one step toward the radially outer side where the back surface of the shaft end cover abuts when the shaft end cover is fitted into the opening. Have stepped parts,
The speed reducer according to claim 1, wherein an inner peripheral wall portion from the opening portion to the step portion of the housing has a tapered surface that expands outward of the housing.
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