JPS6324289Y2

JPS6324289Y2 -

Info

Publication number: JPS6324289Y2
Application number: JP2966584U
Authority: JP
Priority date: 1984-02-29
Filing date: 1984-02-29
Publication date: 1988-07-04
Also published as: JPS60142357U

Description

【考案の詳細な説明】 (イ) 産業上の利用分野本考案は、軸の先端部を突出させているハウジ
ングの開口部における液封等に利用される軸封装
置に関するものである。[Detailed Description of the Invention] (A) Field of Industrial Application The present invention relates to a shaft sealing device used for liquid sealing in an opening of a housing from which the tip of the shaft protrudes.

(ロ) 従来技術従来、ハウジングの開口部と、スプラインを形
成した先端部をこのハウジング開口部から突出さ
せた軸との間に設ける軸封装置としては、前記軸
のスプラインを形成していない部位の外周面を摺
接面とし、前記開口部に設けたシール部材の内周
をかかる摺接面に摺接させるようにしたものが一
般的である。軸封装置をこのような構成にしてい
るのは、前記軸のスプラインを形成した部位にシ
ール部材を摺接させたのでは該スプラインの谷か
らオイル等が漏出入するので軸封ができないから
である。(B) Prior Art Conventionally, a shaft sealing device provided between an opening of a housing and a shaft whose distal end portion formed with a spline protrudes from the housing opening has been provided using a portion of the shaft where a spline is not formed. Generally, the outer circumferential surface of the opening is a sliding contact surface, and the inner circumference of a sealing member provided in the opening is brought into sliding contact with the sliding surface. The reason why the shaft sealing device is configured in this way is because if the sealing member is brought into sliding contact with the splined portion of the shaft, oil etc. will leak in and out from the valleys of the splines, making it impossible to seal the shaft. be.

ところで、前記のようなスプラインは、通常、
円板状の切削具を回転させながら軸に当接させ、
該軸の先端から基端側へ向かつて外周所定部位を
切削することによつて形成するようにしている。
そのため、かかる切削加工により、第１図に示す
ように、軸ａに形成したスプラインｂの基端側端
部は前記切削具の外周面に対応して谷部b′が断面
円弧状をなす。かかる基端側端部を切り上げ部ｃ
と称している。 By the way, the above-mentioned spline is usually
A disc-shaped cutting tool is rotated and brought into contact with the shaft,
It is formed by cutting a predetermined portion of the outer periphery from the tip of the shaft toward the base end.
Therefore, as shown in FIG. 1, by this cutting process, the proximal end of the spline b formed on the shaft a has a trough b' having an arcuate cross-section corresponding to the outer peripheral surface of the cutting tool. Cut up the proximal end part c
It is called.

ところが、この切り上げ部ｃは、軸ａに嵌合す
る部材の内周と噛合させることができず、スプラ
インとしての用をなすことができない。また、シ
ール部材ｄはこの切り上げ部ｃより基端側に設け
ねばならない。そのため、かかる切り上げ部ｃの
長さ分軸長さにロスが生じるという不都合があ
る。 However, this cut-up portion c cannot be engaged with the inner periphery of the member that fits on the shaft a, and cannot serve as a spline. Further, the sealing member d must be provided on the proximal end side of the cut-up portion c. Therefore, there is an inconvenience that a loss occurs in the axial length by the length of the rounded-up portion c.

(ハ) 目的本考案は、このような事情に着目してなされた
もので、前記軸の軸長さのロスをなくすことがで
きる軸封装置を提供することを目的とする。(c) Purpose The present invention has been made with attention to the above-mentioned circumstances, and an object thereof is to provide a shaft sealing device that can eliminate the loss in the length of the shaft.

(ニ) 構成本考案は、前記目的を実現するために、前記軸
のスプライン又はキーを形成した部位に環状溝
を、その底径が前記スプライン又はキーの該環状
溝を設けた部位の谷径又は溝底径より小さくなる
ように軸心回りに設けるとともに、前記ハウジン
グの開口部にシール部材を、その内周を前記環状
溝に摺接させて設けたことを特徴とする。(D) Structure In order to achieve the above object, the present invention provides an annular groove in the part of the shaft where the spline or key is formed, and the bottom diameter of the annular groove is the root diameter of the part of the spline or key where the annular groove is formed. Alternatively, the seal member is provided around the axis so as to be smaller than the groove bottom diameter, and a seal member is provided at the opening of the housing, with its inner periphery slidingly in contact with the annular groove.

(ホ) 実施例以下、本考案の一実施例を図面を参照して説明
する。(E) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

油圧ポンプＡのハウジング１に開口部２を設け
ている。そして、このハウジング１内に、図示し
ないピストン等とともに、軸３を収容している。
そして、この軸３の先端部３ａを前記開口部２か
ら外部へ突出させている。この先端部３ａにはス
プライン４を形成している。キー溝でもよいが、
以下スプラインを例に説明する。 A housing 1 of a hydraulic pump A is provided with an opening 2. A shaft 3 is housed in the housing 1 along with a piston (not shown) and the like.
The tip end 3a of this shaft 3 is made to protrude from the opening 2 to the outside. A spline 4 is formed on this tip 3a. It may be a keyway, but
This will be explained below using a spline as an example.

このような油圧ポンプＡに、軸封装置５を設け
ている。この軸封装置５は、前記軸３に設けた環
状溝６と、前記ハウジング１の開口部２に設けた
シール部材７とを具備してなる。環状溝６は、前
記軸３の先端部３ａの段差を有する部位３a′に形
成したスプライン４の切り上げ部４ａに設けた凹
凸のない円環状のものであり、底面６ａを前記ス
プライン４の該環状溝６を設けた部位の谷底面よ
り深い位置に設け、第３図に示すように底径Φ₁
を前記スプライン４の該環状溝６を設けた部位の
谷径Φ₂より小としている。また、シール部材７
は、前記ハウジング１の開口部２に外周８ａを玉
軸受９のアウターリングと止め輪１１とによつて
挟持させて液密に固定したリング状のシール板８
と、このシール板８の内周８ｂに外周１２ａを固
着した状態で前記環状溝６に嵌入されその内周１
２ｂを前記底面６ａに摺接させたゴムエツジ１２
とを有している。 Such a hydraulic pump A is provided with a shaft sealing device 5. This shaft sealing device 5 includes an annular groove 6 provided in the shaft 3 and a sealing member 7 provided in the opening 2 of the housing 1. The annular groove 6 is an annular groove with no unevenness provided in the cut-up portion 4a of the spline 4 formed in the step portion 3a' of the tip end 3a of the shaft 3, and the bottom surface 6a is formed in the annular shape of the spline 4. The groove 6 is provided at a position deeper than the bottom surface of the groove 6, and the bottom diameter is Φ ₁ as shown in Fig. 3.
is smaller than the root diameter Φ ₂ of the portion of the spline 4 where the annular groove 6 is provided. In addition, the seal member 7
A ring-shaped seal plate 8 is liquid-tightly fixed to the opening 2 of the housing 1 with its outer periphery 8a sandwiched between the outer ring of the ball bearing 9 and the retaining ring 11.
Then, the seal plate 8 is fitted into the annular groove 6 with the outer circumference 12a fixed to the inner circumference 8b, and the inner circumference 1
2b is in sliding contact with the bottom surface 6a.
It has

なお、１３はオイルシール、１４，１５，１６
は止め輪である。 In addition, 13 is an oil seal, 14, 15, 16
is a retaining ring.

このような構成のものであれば、軸３あるいは
ハウジング１を回転させると、環状溝６あるいは
シール部材７が軸３の軸心回りに回転する。この
とき、前記環状溝６は凹凸のない円環状の溝であ
るので、前記シール部材７のゴムエツジ１２の内
周１２ｂを該円環状６の底面６ａに常時摺接させ
ておくことができる。したがつて、該内周１２ｂ
と底面６ａの間からハウジング１内に塵や水滴等
が浸入するという不都合が生じない。また、シー
ル部材７のシール板８の外周８ａも前述したよう
に開口部２に液密に固定されているので、かかる
開口部２と外周８ａからの塵や水滴等の侵入も防
止できる。 With such a configuration, when the shaft 3 or the housing 1 is rotated, the annular groove 6 or the seal member 7 rotates around the axis of the shaft 3. At this time, since the annular groove 6 is an annular groove without unevenness, the inner circumference 12b of the rubber edge 12 of the sealing member 7 can be kept in sliding contact with the bottom surface 6a of the annular groove 6 at all times. Therefore, the inner circumference 12b
This eliminates the inconvenience of dust, water droplets, etc. entering the housing 1 between the bottom surface 6a and the bottom surface 6a. Furthermore, since the outer periphery 8a of the seal plate 8 of the sealing member 7 is also liquid-tightly fixed to the opening 2 as described above, it is possible to prevent dust, water droplets, etc. from entering through the opening 2 and the outer periphery 8a.

なお、ハウジング１内からのオイル等の漏出は
オイルシール１３によつて防止される。 Note that leakage of oil and the like from inside the housing 1 is prevented by the oil seal 13.

このように、本実施例によれば、従来は全く用
をなさなかつた切り上げ部４ａをシール部材７の
摺接面として有効に利用することができるので、
第４図に示すように従来の軸より軸長さを１だけ
短縮することができ、それだけ軸長さのロスを解
消することができる。 In this way, according to this embodiment, the cut-up portion 4a, which was completely useless in the past, can be effectively used as the sliding surface of the seal member 7.
As shown in FIG. 4, the shaft length can be reduced by 1 compared to the conventional shaft, and the loss in shaft length can be eliminated accordingly.

なお、本考案は前記実施例に限られないのは勿
論であり、シール部材はシール板およびゴムエツ
ジからなるものに限られず、例えばオイルシール
でもよい。この場合は、該オイルシールの内周を
溝に摺接させることになる。 It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and the sealing member is not limited to a sealing plate and a rubber edge, but may be an oil seal, for example. In this case, the inner periphery of the oil seal is brought into sliding contact with the groove.

また、環状溝を設ける部位はスプラインの切り
上げ部に限られず、スプラインの他の部位でもよ
いが、切り上げ部に設ければ従来用をなさなかつ
た該切り上げ部を有効に利用でき、それだけ軸長
さのロスの解消に役立つ。 Further, the part where the annular groove is provided is not limited to the cut-up part of the spline, but may be any other part of the spline, but if it is provided in the cut-up part, the cut-up part, which has not been used in the past, can be effectively used, and the shaft length can be reduced accordingly. This helps eliminate losses.

また、用途は油圧ポンプに限られず、軸のスプ
ラインを形成した先端部をハウジングの開口部か
ら突出させた機器類に広く適用が可能であり、例
えば、変速機に適用してもよい。 Furthermore, the application is not limited to hydraulic pumps, but can be widely applied to equipment in which the splined end of the shaft protrudes from the opening of the housing, and may be applied to transmissions, for example.

また、切り上げ部を軸の段差を有する部位に設
けたものに限られず、軸の同径な部位に設けたも
のであつてもよい。 Further, the cut-up portion is not limited to being provided at a portion of the shaft having a step, but may be provided at a portion of the shaft having the same diameter.

その他、本考案の趣旨を逸脱しない範囲で種々
変形が可能である。 Various other modifications can be made without departing from the spirit of the present invention.

(ヘ) 効果以上、説明したように、本考案は、軸の軸長さ
のロスを解消することができる軸封装置を提供で
きるものである。(f) Effects As explained above, the present invention can provide a shaft sealing device that can eliminate the loss in shaft length.

[Brief explanation of the drawing]

第１図は従来例を示す要部の一部切欠した概略
正面図である。第２図〜第４図は本考案の一実施
例を示し、第２図は一部切欠した正面図、第３図
は環状溝を示す拡大断面図、第４図は要部を示す
第１図相当の概略拡大正面図である。１……ハウジング、２……開口部、３……軸、
３ａ……先端部、４……スプライン、４ａ……切
り上げ部、５……軸封装置、６……環状溝、７…
…シール部材、Ａ……油圧ポンプ、Φ₁……溝の
底径、Φ₂……スプラインの溝を設けた部位の谷
径。 FIG. 1 is a partially cutaway schematic front view of the main part of a conventional example. Figures 2 to 4 show one embodiment of the present invention, with Figure 2 being a partially cutaway front view, Figure 3 being an enlarged sectional view showing the annular groove, and Figure 4 being the first embodiment showing the main parts. FIG. 2 is a schematic enlarged front view corresponding to the figure. 1... Housing, 2... Opening, 3... Shaft,
3a... Tip portion, 4... Spline, 4a... Cut-up portion, 5... Shaft sealing device, 6... Annular groove, 7...
... Seal member, A ... Hydraulic pump, Φ ₁ ... Bottom diameter of the groove, Φ ₂ ... Bottom diameter of the part where the spline groove is provided.

Claims

[Scope of utility model registration request]

A shaft sealing device provided between an opening of a housing and a shaft having a tip portion formed with a spline or a key protruding from the opening of the housing, the shaft sealing device having an annular shape at a portion of the shaft where the spline or key is formed. A groove is provided around the axis so that the bottom diameter of the groove is smaller than the root diameter or groove bottom diameter of the portion of the spline or key where the annular groove is provided, and a sealing member is provided in the opening of the housing. A shaft sealing device characterized in that the shaft sealing device is provided with a circumference slidingly contacted with the annular groove.