JP3903155B2 - Drive shaft - Google Patents

Drive shaft Download PDF

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Publication number
JP3903155B2
JP3903155B2 JP2000050567A JP2000050567A JP3903155B2 JP 3903155 B2 JP3903155 B2 JP 3903155B2 JP 2000050567 A JP2000050567 A JP 2000050567A JP 2000050567 A JP2000050567 A JP 2000050567A JP 3903155 B2 JP3903155 B2 JP 3903155B2
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JP
Japan
Prior art keywords
dust cap
cylindrical sleeve
air hole
drive shaft
fitted
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
Application number
JP2000050567A
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Japanese (ja)
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JP2001241460A (en
Inventor
健 東條
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.)
JTEKT Corp
Original Assignee
JTEKT Corp
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
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Priority to JP2000050567A priority Critical patent/JP3903155B2/en
Publication of JP2001241460A publication Critical patent/JP2001241460A/en
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Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、車両のプロペラシャフト等のようなドライブシャフトに関する。
【０００２】
【従来の技術】
従来のドライブシャフトは、図２のように、内軸２０の周面に形成されたスプライン２１と、筒状スリーブ２２の内周面に形成されたスプライン２３とがスプライン嵌合とされ、軸方向に所定距離だけ伸縮自在に連結して回転トルクを伝達するようになっている。また、筒状スリーブ２２の先端部２５には、内軸２０の周面に摺接する密封シール２８が嵌合固定されるとともに、筒状スリーブ２２の根元端部２４には、内軸２０の端面２６を覆いグリースの封入を兼ねるダストキャップ２７が嵌合固定されている。そして上記グリースは、定期的に補充されてスプライン部の摩耗やかじりを防止している。また、内軸２０と筒状スリーブ２２の軸方向の伸縮時、筒状スリーブ２２内の容積変化によるスプライン部の摺動抵抗が発生するが、この摺動抵抗の低減のため、上記ダストキャップ２７のドライブシャフト回転軸線上の箇所に、空気孔２９が形成されている。なお、内部のグリースは、遠心力にて筒状スリーブ２２の内周面に塗布されたような状態で保持されるため、上記空気孔２９から外部に洩れにくい。
【０００３】
【発明が解決しようとする課題】
上記従来のドライブシャフトにおいては、ドライブシャフト稼動時に上記空気孔２９から外部のダストや泥水等が侵入し、スプライン嵌合部の潤滑を阻害したり、グリースの劣化を招きやすかった。
【０００４】
本発明は、ドライブシャフトにおいて、ダストキャップの空気孔から外部のダストや泥水等が侵入する恐れを解消することを目的とする。
【０００５】
【課題を解決するための手段】
上記課題を解決する手段として、内軸と筒状スリーブとをスプライン嵌合し、この筒状スリーブの先端部に内軸周面に摺接する密封シールを嵌合固定し、筒状スリーブの根元端部に、内軸端部を覆うダストキャップを嵌合固定し、内軸と筒状スリーブとを一定範囲にて軸方向摺動自在としたドライブシャフトにおいて、上記ダストキャップは、内側ダストキャップと、底部および円筒状縁部を有する断面コ字形の外側ダストキャップとの互いの底部を軸方向に所定の間隔を設けて配置することにより２重底部を形成し、内側ダストキャップの底部の中央部に第１空気孔を形成するとともに、外側ダストキャップの前記円筒状縁部に径方向に貫通する第２空気孔を形成したことを特徴とする。
【０００６】
【発明の実施の形態】
図１はこの発明の一実施形態である。内軸１の周面に形成されたスプライン２と、筒状スリーブ３の内周面に形成されたスプライン４とがスプライン嵌合とされ、軸方向に所定距離だけ伸縮自在に連結して回転トルクを伝達するようになっている。また、筒状スリーブ３の先端部６には、内軸１の周面に摺接する密封シール９が嵌合固定されるとともに、筒状スリーブ３の根元端部５には、内軸１の端面７を覆いグリースの封入を兼ねるダストキャップ８が嵌合固定されている。そして上記グリースは、定期的に補充されてスプライン部の摩耗やかじりを防止している。
【０００７】
上記ダストキャップ８は、断面コ字形の内側ダストキャップ１０と外側ダストキャップ１１が互いの底部１０ａ，１１ａが軸方向に所定距離を設けて重合された構成であり、外側ダストキャップ１１の縁部１１ｂが筒状スリーブ３の根元端部５の内周面に嵌合固定されている。また、内側ダストキャップ１０には、ドライブシャフト回転軸線上の箇所に小径の第１空気孔１２が形成されるとともに、外側ダストキャップ１１には、その縁部１１ｂに第２空気孔１３がそれぞれ形成されている。この両空気孔１２，１３は、内軸１と筒状スリーブ３の軸方向伸縮時の筒状スリーブ３内の容積変化によるスプライン部の摺動抵抗を低減させるためのものである。なお、外側ダストキャップ１１の縁部１１ｂは、内側ダストキャップ１０の縁部１０ｂに重合させているが、内側ダストキャップ１０の底部１０ａに溶接にて一体にしてもよい。
【０００８】
そして、上記内側ダストキャップ１０の第１空気孔１２は、ドライブシャフト回転軸線上の底部１０ａの箇所に形成されているため、遠心力にて筒状スリーブ３の内周面に塗布されたような状態で保持される内部のグリースは、上記第１空気孔１２から外部に洩れにくい。
【０００９】
また、外側ダストキャップ１１は、その縁部１１ｂに第２空気孔１３が形成されているため、内側ダストキャップ１０の第１空気孔１２が直接外部に対向することがない。従って、ドライブシャフトの回転中に、外側ダストキャップ１１の第２空気孔１３からダストや泥水等が侵入しても、遠心力で第２空気孔１３から再度外部へ放出され、内側ダストキャップ１０の第１空気孔１２を通じて内部に侵入することがない。このため、スプライン嵌合部の潤滑が阻害およびグリースの劣化が防止される。
【００１０】
なお、第２空気孔１３は、外側ダストキャップ１１の縁部１１ｂに形成されるのが遠心力で内部のダスト等を外部に放出するうえで最も良いが、少なくとも第１空気孔１２より径方向に偏心していれば、第２空気孔１３から侵入したダスト等が第１空気孔１２に到達する前に遠心力の影響を受けて、外側ダストキャップ１１の縁部内周に集められ、第１空気孔１２から内部に侵入することが防止される。
【００１１】
【発明の効果】
この発明は、内軸と筒状スリーブとをスプライン嵌合し、この筒状スリーブの先端部に内軸周面に摺接する密封シールを嵌合固定し、筒状スリーブの根元端部に、内軸端部を覆うダストキャップを嵌合固定し、内軸と筒状スリーブとを一定範囲にて軸方向摺動自在としたドライブシャフトにおいて、上記ダストキャップは、内側ダストキャップと、底部および円筒状縁部を有する断面コ字形の外側ダストキャップとの互いの底部を軸方向に所定の間隔を設けて配置することにより２重底部を形成し、内側ダストキャップの底部の中央部に第１空気孔を形成するとともに、外側ダストキャップの前記円筒状縁部に径方向に貫通する第２空気孔を形成したため、第１空気孔から外部のダストや泥水等が侵入する恐れがなくなる。従って、スプライン嵌合部の潤滑の阻害およびグリースの劣化が防止される。
【図面の簡単な説明】
【図１】本発明の一実施形態のドライブシャフトの要部断面図である。
【図２】従来のドライブシャフトの要部断面図である。
【符号の説明】
１ 内軸
２ スプライン
３ 筒状スリーブ
４ スプライン
５ 根元端部
６ 先端部
７ 端面
８ ダストキャップ
９ 密封シール
１０ 内側ダストキャップ
１１ 外側ダストキャップ
１２ 第１空気孔
１３ 第２空気孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drive shaft such as a propeller shaft of a vehicle.
[0002]
[Prior art]
As shown in FIG. 2, in the conventional drive shaft, a spline 21 formed on the peripheral surface of the inner shaft 20 and a spline 23 formed on the inner peripheral surface of the cylindrical sleeve 22 are spline-fitted, and the axial direction Rotational torque is transmitted by being telescopically connected by a predetermined distance. A sealing seal 28 slidably contacting the peripheral surface of the inner shaft 20 is fitted and fixed to the distal end portion 25 of the cylindrical sleeve 22, and the end surface of the inner shaft 20 is fixed to the root end portion 24 of the cylindrical sleeve 22. A dust cap 27 is also fitted and fixed so as to cover the nozzle 26 and also serve as a grease seal. The grease is regularly replenished to prevent wear and galling of the spline portion. Further, when the inner shaft 20 and the cylindrical sleeve 22 are expanded or contracted in the axial direction, sliding resistance of the spline portion due to volume change in the cylindrical sleeve 22 is generated. In order to reduce this sliding resistance, the dust cap 27 An air hole 29 is formed at a location on the drive shaft rotation axis. Since the internal grease is held in a state where it is applied to the inner peripheral surface of the cylindrical sleeve 22 by centrifugal force, it is difficult to leak out from the air hole 29 to the outside.
[0003]
[Problems to be solved by the invention]
In the conventional drive shaft, external dust, muddy water, and the like enter from the air holes 29 when the drive shaft is in operation, and the spline fitting portion is not easily lubricated and the grease is liable to deteriorate.
[0004]
An object of the present invention is to eliminate the possibility of external dust, muddy water, and the like entering from an air hole of a dust cap in a drive shaft.
[0005]
[Means for Solving the Problems]
As means for solving the above problems, the inner shaft and the cylindrical sleeve are spline-fitted, and a sealing seal slidably in contact with the inner shaft peripheral surface is fitted and fixed to the distal end portion of the cylindrical sleeve. In the drive shaft in which a dust cap that covers the inner shaft end portion is fitted and fixed to the portion, and the inner shaft and the cylindrical sleeve are axially slidable within a certain range, the dust cap includes an inner dust cap, A double bottom is formed by arranging the bottoms of the outer dust cap with a U-shaped cross section having a bottom and a cylindrical edge portion at predetermined intervals in the axial direction, and is formed at the center of the bottom of the inner dust cap. A first air hole is formed, and a second air hole penetrating in the radial direction is formed in the cylindrical edge portion of the outer dust cap.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the present invention. A spline 2 formed on the peripheral surface of the inner shaft 1 and a spline 4 formed on the inner peripheral surface of the cylindrical sleeve 3 are spline-fitted, and are connected to each other so as to expand and contract by a predetermined distance in the axial direction. To communicate. A sealing seal 9 slidably contacting the peripheral surface of the inner shaft 1 is fitted and fixed to the distal end portion 6 of the cylindrical sleeve 3, and an end surface of the inner shaft 1 is fixed to the root end portion 5 of the cylindrical sleeve 3. A dust cap 8 is also fitted and fixed so as to cover 7 and also to enclose grease. The grease is regularly replenished to prevent wear and galling of the spline portion.
[0007]
The dust cap 8 has a configuration in which an inner dust cap 10 and an outer dust cap 11 having a U-shaped cross section are superposed on each other with a predetermined distance in the axial direction between the bottom portions 10a and 11a. Is fitted and fixed to the inner peripheral surface of the root end portion 5 of the cylindrical sleeve 3. The inner dust cap 10 is formed with a first air hole 12 having a small diameter at a location on the drive shaft rotation axis, and the outer dust cap 11 is formed with a second air hole 13 at the edge 11b. Has been. These air holes 12 and 13 are for reducing the sliding resistance of the spline portion due to the volume change in the cylindrical sleeve 3 when the inner shaft 1 and the cylindrical sleeve 3 are expanded and contracted in the axial direction. Although the edge portion 11b of the outer dust cap 11 is superposed on the edge portion 10b of the inner dust cap 10, it may be integrated with the bottom portion 10a of the inner dust cap 10 by welding.
[0008]
And since the 1st air hole 12 of the said inner side dust cap 10 is formed in the location of the bottom part 10a on a drive shaft rotating shaft line, it was apply | coated to the internal peripheral surface of the cylindrical sleeve 3 with centrifugal force The internal grease held in a state is unlikely to leak outside from the first air hole 12.
[0009]
Moreover, since the 2nd air hole 13 is formed in the edge part 11b, the 1st air hole 12 of the inner side dust cap 10 does not directly oppose the outer dust cap 11 outside. Therefore, even if dust, muddy water, or the like enters from the second air hole 13 of the outer dust cap 11 during rotation of the drive shaft, it is discharged to the outside again from the second air hole 13 by centrifugal force, and the inner dust cap 10 There is no intrusion through the first air holes 12. For this reason, the lubrication of the spline fitting portion is hindered and the grease is prevented from deteriorating.
[0010]
The second air hole 13 is best formed at the edge 11b of the outer dust cap 11 in order to discharge the internal dust and the like to the outside by centrifugal force, but at least in the radial direction from the first air hole 12. If the dust or the like that has entered the second air hole 13 reaches the first air hole 12, the dust or the like is influenced by the centrifugal force and collected on the inner periphery of the outer dust cap 11. Intrusion into the inside from the hole 12 is prevented.
[0011]
【The invention's effect】
According to the present invention, the inner shaft and the cylindrical sleeve are spline-fitted, a sealing seal that is in sliding contact with the inner shaft peripheral surface is fitted and fixed to the tip of the cylindrical sleeve, and the inner end of the cylindrical sleeve is In the drive shaft in which the dust cap covering the shaft end is fitted and fixed, and the inner shaft and the cylindrical sleeve are axially slidable within a certain range, the dust cap includes the inner dust cap, the bottom portion, and the cylindrical shape. A double bottom is formed by arranging the bottoms of the outer dust caps having an edge and a U-shaped outer dust cap at predetermined intervals in the axial direction, and a first air hole is formed at the center of the bottom of the inner dust cap. Since the second air hole penetrating in the radial direction is formed in the cylindrical edge portion of the outer dust cap, there is no possibility that external dust, muddy water, or the like enters from the first air hole. Therefore, the inhibition of the lubrication of the spline fitting portion and the deterioration of the grease are prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a drive shaft according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of a conventional drive shaft.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner shaft 2 Spline 3 Cylindrical sleeve 4 Spline 5 Root end part 6 Tip part 7 End surface 8 Dust cap 9 Sealing seal 10 Inner dust cap 11 Outer dust cap 12 First air hole 13 Second air hole

Claims (1)

内軸と筒状スリーブとをスプライン嵌合し、この筒状スリーブの先端部に内軸周面に摺接する密封シールを嵌合固定し、筒状スリーブの根元端部に、内軸端部を覆うダストキャップを嵌合固定し、内軸と筒状スリーブとを一定範囲にて軸方向摺動自在としたドライブシャフトにおいて、上記ダストキャップは、内側ダストキャップと、底部および円筒状縁部を有する断面コ字形の外側ダストキャップとの互いの底部を軸方向に所定の間隔を設けて配置することにより２重底部を形成し、内側ダストキャップの底部の中央部に第１空気孔を形成するとともに、外側ダストキャップの前記円筒状縁部に径方向に貫通する第２空気孔を形成したことを特徴とするドライブシャフト。The inner shaft and the cylindrical sleeve are spline-fitted, and a sealing seal that is in sliding contact with the peripheral surface of the inner shaft is fitted and fixed to the tip of the cylindrical sleeve, and the inner shaft end is attached to the root end of the cylindrical sleeve. In the drive shaft in which the dust cap is covered and fixed and the inner shaft and the cylindrical sleeve are axially slidable within a certain range, the dust cap has an inner dust cap, a bottom portion, and a cylindrical edge portion. A double bottom portion is formed by arranging the bottom portions of the outer dust cap with a U-shaped cross section at predetermined intervals in the axial direction, and a first air hole is formed at the center portion of the bottom portion of the inner dust cap. A drive shaft, wherein a second air hole penetrating in a radial direction is formed in the cylindrical edge portion of the outer dust cap.
JP2000050567A 2000-02-28 2000-02-28 Drive shaft Expired - Fee Related JP3903155B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000050567A JP3903155B2 (en) 2000-02-28 2000-02-28 Drive shaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000050567A JP3903155B2 (en) 2000-02-28 2000-02-28 Drive shaft

Publications (2)

Publication Number Publication Date
JP2001241460A JP2001241460A (en) 2001-09-07
JP3903155B2 true JP3903155B2 (en) 2007-04-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000050567A Expired - Fee Related JP3903155B2 (en) 2000-02-28 2000-02-28 Drive shaft

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6367659B2 (en) * 2014-09-18 2018-08-01 日立オートモティブシステムズ株式会社 Power transmission shaft and vehicle propeller shaft

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