JP2021050785A - Constant velocity universal joint - Google Patents

Constant velocity universal joint Download PDF

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JP2021050785A
JP2021050785A JP2019174570A JP2019174570A JP2021050785A JP 2021050785 A JP2021050785 A JP 2021050785A JP 2019174570 A JP2019174570 A JP 2019174570A JP 2019174570 A JP2019174570 A JP 2019174570A JP 2021050785 A JP2021050785 A JP 2021050785A
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shaft
joint member
boot
outer joint
end portion
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JP7477951B2 (en
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小川　浩司
Koji Ogawa
浩司 小川
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IJTT Co Ltd
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IJTT Co Ltd
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Abstract

To provide a constant velocity universal joint which can inhibit a lubricant from adhering to an inner wall of a boot.SOLUTION: A constant velocity universal joint 100 includes: a cylindrical outer joint member 10 which is coupled to a first shaft 4 and lubricated at its interior by a lubricant G; an inner joint member 20 which is coupled to a second shaft 2 and disposed at the interior of the outer joint member 10; a boot 30 which closes a space between a second shaft 2 side end part 11 of the outer joint member 10 and the second shaft 2; and a seal member 40 which closes a space between the second shaft 2 side end part 11 of the outer joint member 10 and the second shaft 2 at the inner side of the boot 30.SELECTED DRAWING: Figure 3

Description

本開示は、等速自在継手に関する。 The present disclosure relates to constant velocity universal joints.

車両のプロペラシャフト等に使用される等速自在継手は、直列に配置された第１シャフト及び第２シャフト間でトルクを伝達するように構成される。 A constant velocity universal joint used for a vehicle propeller shaft or the like is configured to transmit torque between a first shaft and a second shaft arranged in series.

一般的に、等速自在継手は、第１シャフトに結合される筒状の外側継手部材と、第２シャフトに結合される内側継手部材と、外側継手部材の第２シャフト側の端部と第２シャフトとの間を塞ぐブーツと、を備える。 Generally, the constant velocity universal joint includes a tubular outer joint member coupled to the first shaft, an inner joint member coupled to the second shaft, and an end portion and a second portion of the outer joint member on the second shaft side. It is equipped with boots that close the space between the two shafts.

外側継手部材の内部は、潤滑材で潤滑され、内側継手部材は、外側継手部材の中心軸に対し周方向に相対回転不能かつ傾動可能に設けられる。また、ブーツは、外側継手部材及び内側継手部材に対して相対回転不能に設けられる。 The inside of the outer joint member is lubricated with a lubricant, and the inner joint member is provided so as to be non-rotatable and tiltable in the circumferential direction with respect to the central axis of the outer joint member. Further, the boots are provided so as not to rotate relative to the outer joint member and the inner joint member.

特開２０１５−６８３７７号公報Japanese Unexamined Patent Publication No. 2015-68377

ところで、上記の等速自在継手では、外側継手部材の内部から、その軸方向の第２シャフト側に向かって潤滑材が移動して、ブーツの内壁に潤滑材が付着する場合がある。この場合、例えば、ブーツに掛かる遠心力が潤滑材の重みで増加して、ブーツに変形が生じ、ブーツの寿命が低下する虞がある。 By the way, in the above-mentioned constant velocity universal joint, the lubricant may move from the inside of the outer joint member toward the second shaft side in the axial direction, and the lubricant may adhere to the inner wall of the boot. In this case, for example, the centrifugal force applied to the boot increases due to the weight of the lubricant, which may cause deformation of the boot and shorten the life of the boot.

そこで、本開示は、かかる事情に鑑みて創案され、その目的は、ブーツの内壁に潤滑材が付着するのを抑制できる等速自在継手を提供することにある。 Therefore, the present disclosure was conceived in view of such circumstances, and an object of the present disclosure is to provide a constant velocity universal joint capable of suppressing adhesion of a lubricant to the inner wall of a boot.

本開示の一の態様によれば、第１シャフトと第２シャフトとを直列に接続する等速自在継手であって、前記第１シャフトに結合され、内部が潤滑材で潤滑される筒状の外側継手部材と、前記第２シャフトに結合され、前記外側継手部材の内部に配置された内側継手部材と、前記外側継手部材の前記第２シャフト側の端部と前記第２シャフトとの間を塞ぐブーツと、前記ブーツの内側で前記外側継手部材の前記第２シャフト側の端部と前記第２シャフトとの間を塞ぐシール部材と、を備えることを特徴とする等速自在継手が提供される。 According to one aspect of the present disclosure, it is a constant velocity universal joint that connects the first shaft and the second shaft in series, and has a tubular shape that is coupled to the first shaft and whose inside is lubricated with a lubricant. Between the outer joint member, the inner joint member coupled to the second shaft and arranged inside the outer joint member, and the end of the outer joint member on the second shaft side and the second shaft. Provided is a constant velocity universal joint comprising a boot for closing and a sealing member for closing between the second shaft side end of the outer joint member and the second shaft inside the boot. Lubrication.

好ましくは、前記シール部材は、前記外側継手部材の前記第２シャフト側の端部に嵌合固定されるリング状の基端部と、前記第２シャフトの外周面に摺動自在に嵌合されるリング状の先端部と、前記基端部と前記先端部とを接続する中間壁部と、を備え、前記中間壁部は、前記外側継手部材の軸方向の前記第２シャフト側に向かうにつれ順次縮径する管状のテーパ部を有する。 Preferably, the seal member is slidably fitted to the ring-shaped base end portion fitted and fixed to the end portion of the outer joint member on the second shaft side and the outer peripheral surface of the second shaft. A ring-shaped tip portion and an intermediate wall portion connecting the base end portion and the tip end portion are provided, and the intermediate wall portion is directed toward the second shaft side in the axial direction of the outer joint member. It has a tubular tapered portion that is sequentially reduced in diameter.

また、前記テーパ部は、断面円弧状または直線状に形成されている。 Further, the tapered portion is formed in an arcuate or linear cross section.

また、等速自在継手は、前記外側継手部材の前記第１シャフト側の端部を塞ぐ蓋部材と、前記蓋部材の内側と外側とを連通する通気孔と、を更に備える。 Further, the constant velocity universal joint further includes a lid member that closes the end portion of the outer joint member on the first shaft side, and a ventilation hole that communicates the inside and the outside of the lid member.

また、等速自在継手は、車両のプロペラシャフトに用いられる。 Further, the constant velocity universal joint is used for the propeller shaft of a vehicle.

本開示に係る等速自在継手によれば、ブーツの内壁に潤滑材が付着するのを抑制できる。 According to the constant velocity universal joint according to the present disclosure, it is possible to prevent the lubricant from adhering to the inner wall of the boot.

プロペラシャフトの概略側面図である。It is a schematic side view of a propeller shaft. 図１のＩＩ部に示した等速自在継手の概略断面図である。It is the schematic sectional drawing of the constant velocity universal joint shown in the part II of FIG. 図２において潤滑剤が付着する範囲を表した概略断面図である。FIG. 2 is a schematic cross-sectional view showing a range to which the lubricant adheres in FIG. 外側継手部材と内側継手部材の分解斜視図である。It is an exploded perspective view of the outer joint member and the inner joint member. 外側継手部材の中心軸に対して内側継手部材が傾動した状態を示す概略断面図である。It is schematic cross-sectional view which shows the state which the inner joint member tilted with respect to the central axis of the outer joint member. 図３のＶＩ部に示したブーツの拡大断面図である。It is an enlarged sectional view of the boot shown in the VI part of FIG. 図２のＶＩＩ−ＶＩＩ断面図である。FIG. 2 is a sectional view taken along line VII-VII of FIG. 通気孔及びブリーザ弁の正面図である。It is a front view of a vent hole and a breather valve. 第１変形例を示す拡大断面図である。It is an enlarged sectional view which shows the 1st modification. 第２変形例を示す拡大断面図である。It is an enlarged sectional view which shows the 2nd modification. 第３変形例の等速自在継手の概略断面図である。It is the schematic sectional drawing of the constant velocity universal joint of the 3rd modification.

以下、添付図面を参照して本開示の実施形態を説明する。なお、図中に示す上下前後左右の各方向は、車両（不図示）の上下前後左右の各方向に一致する。 Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. The directions of up, down, front, back, left, and right shown in the figure correspond to each direction of up, down, front, back, left, and right of the vehicle (not shown).

図１は、前側自在継手１００、中間自在継手２００、及び後側自在継手３００を用いたプロペラシャフト１の概略側面図である。 FIG. 1 is a schematic side view of a propeller shaft 1 using a front universal joint 100, an intermediate universal joint 200, and a rear universal joint 300.

プロペラシャフト１は、車両のプロペラシャフトであり、前方から順に配置された、前側自在継手１００、前側軸部２、中間自在継手２００、後側軸部３、及び後側自在継手３００を備える。 The propeller shaft 1 is a propeller shaft of a vehicle, and includes a front universal joint 100, a front shaft portion 2, an intermediate universal joint 200, a rear shaft portion 3, and a rear universal joint 300 arranged in order from the front.

前側自在継手１００は、変速機（不図示）の出力軸４と前側軸部２とを直列に接続する。中間自在継手２００は、前側軸部２と後側軸部３とを直列に接続する。後側自在継手３００は、後側軸部３とファイナルギア（不図示）の入力シャフト５とを直列に接続する。なお、前側軸部２は、車体に固定されたセンターベアリング６によって回転可能に支持される。 The front universal joint 100 connects the output shaft 4 of the transmission (not shown) and the front shaft portion 2 in series. The intermediate universal joint 200 connects the front shaft portion 2 and the rear shaft portion 3 in series. The rear universal joint 300 connects the rear shaft portion 3 and the input shaft 5 of the final gear (not shown) in series. The front shaft portion 2 is rotatably supported by a center bearing 6 fixed to the vehicle body.

車両のエンジン等の動力源の動力は、変速機の出力軸４から前側自在継手１００を通じて前側軸部２に伝達され、前側軸部２から中間自在継手２００を通じて後側軸部３に伝達され、更に、後側軸部３から後側自在継手３００を通じてファイナルギアの入力軸５に伝達される。 The power of the power source such as the engine of the vehicle is transmitted from the output shaft 4 of the transmission to the front shaft portion 2 through the front universal joint 100, and is transmitted from the front shaft portion 2 to the rear shaft portion 3 through the intermediate universal joint 200. Further, it is transmitted from the rear shaft portion 3 to the input shaft 5 of the final gear through the rear universal joint 300.

本実施形態では、図２〜図７を参照して、等速自在継手としての前側自在継手１００について詳しく説明する。なお、図中において、一点鎖線Ｃ１は、外側継手部材１０の中心軸を示し、一点鎖線Ｃ２は、内側継手部材２０の中心軸を示す。 In the present embodiment, the front universal joint 100 as a constant velocity universal joint will be described in detail with reference to FIGS. 2 to 7. In the figure, the alternate long and short dash line C1 indicates the central axis of the outer joint member 10, and the alternate long and short dash line C2 indicates the central axis of the inner joint member 20.

また、本実施形態の前後方向は、外側継手部材１０の軸方向と一致する。本実施形態では、第１シャフトとしての変速機の出力軸４側が前方となり、第２シャフトとしての前側軸部２側が後方となる。 Further, the front-rear direction of the present embodiment coincides with the axial direction of the outer joint member 10. In the present embodiment, the output shaft 4 side of the transmission as the first shaft is the front side, and the front side shaft portion 2 side as the second shaft is the rear side.

図２及び図３に示すように、前側自在継手１００は、固定式の等速自在継手である。前側自在継手１００は、変速機の出力軸４に結合され、内部が潤滑材としてのグリースＧ（図３のみに示す）で潤滑される筒状の外側継手部材１０と、前側軸部２に結合され、外側継手部材１０の内部に配置された内側継手部材２０と、を備える。なお、図２及び図３では、外側継手部材１０及び内側継手部材２０の中心軸Ｃ１，Ｃ２同士が、同軸に配置されている。 As shown in FIGS. 2 and 3, the front universal joint 100 is a fixed constant velocity universal joint. The front universal joint 100 is coupled to the tubular outer joint member 10 which is coupled to the output shaft 4 of the transmission and whose inside is lubricated by grease G (shown only in FIG. 3) as a lubricant, and to the front shaft portion 2. The inner joint member 20 is provided and arranged inside the outer joint member 10. In addition, in FIGS. 2 and 3, the central axes C1 and C2 of the outer joint member 10 and the inner joint member 20 are arranged coaxially with each other.

また、前側自在継手１００は、外側継手部材１０の後端部１１と前側軸部２との間を塞ぐブーツ３０と、ブーツ３０の内側で外側継手部材１０の後端部１１と前側軸部２との間を塞ぐシール部材４０と、外側継手部材１０の前端部１２を塞ぐ蓋部材５０と、を備える。なお、本実施形態において、「ブーツ３０の内側」とは、ブーツ３０よりも前側の位置を意味する。 Further, the front universal joint 100 includes a boot 30 that closes between the rear end portion 11 and the front shaft portion 2 of the outer joint member 10, and the rear end portion 11 and the front shaft portion 2 of the outer joint member 10 inside the boot 30. A seal member 40 that closes between the two, and a lid member 50 that closes the front end portion 12 of the outer joint member 10 are provided. In the present embodiment, the "inside of the boot 30" means a position on the front side of the boot 30.

外側継手部材１０は、前端部１２及び後端部１１が開口された円筒状に形成される。外側継手部材１０は、その外径及び内径において、前端部１２よりも後端部１１の方が小さくなるように形成される。 The outer joint member 10 is formed in a cylindrical shape in which the front end portion 12 and the rear end portion 11 are opened. The outer joint member 10 is formed so that the rear end portion 11 is smaller than the front end portion 12 in terms of its outer diameter and inner diameter.

外側継手部材１０の後端部１１には、外周面１３を周方向に１周する溝部１３ａが形成される。溝部１３ａには、後述するブーツ取付具６０の爪部６１ａが嵌合固定される。 The rear end portion 11 of the outer joint member 10 is formed with a groove portion 13a that goes around the outer peripheral surface 13 once in the circumferential direction. The claw portion 61a of the boot attachment 60, which will be described later, is fitted and fixed to the groove portion 13a.

また、外側継手部材１０の後端部１１には、内周面１４を全周に亘って拡径させた後側拡径部１４ａが形成される。後側拡径部１４ａには、後述するシール部材４０のシール基端部４１が嵌合固定される。 Further, the rear end portion 11 of the outer joint member 10 is formed with a rear side diameter-expanded portion 14a in which the diameter of the inner peripheral surface 14 is expanded over the entire circumference. The seal base end portion 41 of the seal member 40, which will be described later, is fitted and fixed to the rear diameter enlarged portion 14a.

外側継手部材１０の前端部１２には、フランジ１５が形成される。フランジ１５は、ボルト及びナット（不図示）を用いて、変速機の出力軸４の後端部に形成されたフランジ部４ａに締結される。なお、出力軸４は、後端部が開口された中空状に形成される。 A flange 15 is formed on the front end portion 12 of the outer joint member 10. The flange 15 is fastened to the flange portion 4a formed at the rear end portion of the output shaft 4 of the transmission by using bolts and nuts (not shown). The output shaft 4 is formed in a hollow shape with an open rear end.

また、外側継手部材１０の前端部１２には、内周面１４を全周に亘って拡径させた前側拡径部１４ｂが形成される。前側拡径部１４ｂには、後述する蓋部材５０が嵌合固定される。 Further, the front end portion 12 of the outer joint member 10 is formed with a front side diameter-expanded portion 14b having an inner peripheral surface 14 whose diameter is expanded over the entire circumference. A lid member 50, which will be described later, is fitted and fixed to the front diameter-expanded portion 14b.

図２及び図４に示すように、後側拡径部１４ａと前側拡径部１４ｂとの間に位置する外側継手部材１０の内周面１４には、前後方向に延びる外側トラック溝１４ｃが周方向に複数（図示例では、等間隔に６つ）形成される。なお、外側トラック溝１４ｃは、前後方向において、両端よりも中央が径方向外側に緩やかに膨らむように球面状に形成される。 As shown in FIGS. 2 and 4, an outer track groove 14c extending in the front-rear direction surrounds the inner peripheral surface 14 of the outer joint member 10 located between the rear diameter-expanded portion 14a and the front-side enlarged diameter portion 14b. A plurality of directions (six at equal intervals in the illustrated example) are formed. The outer track groove 14c is formed in a spherical shape so that the center of the outer track groove 14c gently bulges outward in the radial direction from both ends in the front-rear direction.

内側継手部材２０は、リング状に形成され、前側軸部２の前端部にスプライン嵌合される。内側継手部材２０の外周面２１には、前後方向に延びる内側トラック溝２１ａが周方向に複数（図示例では、等間隔に６つ）形成される。 The inner joint member 20 is formed in a ring shape and is spline-fitted to the front end portion of the front shaft portion 2. A plurality of inner track grooves 21a extending in the front-rear direction are formed on the outer peripheral surface 21 of the inner joint member 20 in the circumferential direction (six at equal intervals in the illustrated example).

外側継手部材１０と内側継手部材２０との間には、ケージ２２及びボール２３が介在される。 A cage 22 and a ball 23 are interposed between the outer joint member 10 and the inner joint member 20.

ケージ２２は、リング状に形成され、周方向に複数（図示例では、６つ）の開口部２２ａを有する。ボール２３は、複数（図示例では、６つ）設けられ、ケージ２２の開口部２２ａにそれぞれ挿通される。 The cage 22 is formed in a ring shape and has a plurality of (six in the illustrated example) openings 22a in the circumferential direction. A plurality of balls (six in the illustrated example) are provided, and each of the balls 23 is inserted into the opening 22a of the cage 22.

また、ボール２３は、外側トラック溝１４ｃ及び内側トラック溝２１ａに保持される。これにより、内側継手部材２０は、外側継手部材の中心軸Ｃ１に対し周方向に相対回転不能となり、ボール２３を介して外側継手部材１０からのトルクが伝達される。 Further, the ball 23 is held in the outer track groove 14c and the inner track groove 21a. As a result, the inner joint member 20 becomes unable to rotate relative to the central axis C1 of the outer joint member in the circumferential direction, and torque from the outer joint member 10 is transmitted via the ball 23.

また、ボール２３は、外側トラック溝１４ｃ上を前後方向に転動する。これにより、図５中の中心軸Ｃ１，Ｃ２で示すように、内側継手部材２０は、外側継手部材１０の中心軸Ｃ１に対し傾動できる。 Further, the ball 23 rolls in the front-rear direction on the outer track groove 14c. As a result, as shown by the central axes C1 and C2 in FIG. 5, the inner joint member 20 can be tilted with respect to the central axis C1 of the outer joint member 10.

他方、図３に示したように、外側継手部材１０、内側継手部材２０、ケージ２２及びボール２３同士の接触面は、グリースＧで潤滑される。これにより、接触面における摩擦係数が低減され、摩擦による外側継手部材１０の内部の摩耗と発熱が抑えられる。 On the other hand, as shown in FIG. 3, the contact surfaces of the outer joint member 10, the inner joint member 20, the cage 22 and the balls 23 are lubricated with grease G. As a result, the friction coefficient on the contact surface is reduced, and wear and heat generation inside the outer joint member 10 due to friction are suppressed.

ブーツ３０は、外部からの異物の侵入を防ぎ、グリースＧを保持する。ブーツ３０は、管状に形成され、内側継手部材２０と同軸に配置される。また、ブーツ３０は、ブーツ取付具６０を介して外側継手部材１０の後端部１１に取り付けられる。 The boot 30 prevents foreign matter from entering from the outside and holds the grease G. The boot 30 is formed in a tubular shape and is arranged coaxially with the inner joint member 20. Further, the boot 30 is attached to the rear end portion 11 of the outer joint member 10 via the boot attachment 60.

ブーツ取付具６０は、金属材料または樹脂材料からなり、円筒状に形成され、外側継手部材１０と同軸に配置される。 The boot fitting 60 is made of a metal material or a resin material, is formed in a cylindrical shape, and is arranged coaxially with the outer joint member 10.

ブーツ取付具６０の前端部６１は、外側継手部材１０の後端部１１の外径よりも僅かに小さい内径を有し、外側継手部材１０の後端部１１を圧入させる。 The front end portion 61 of the boot fitting 60 has an inner diameter slightly smaller than the outer diameter of the rear end portion 11 of the outer joint member 10, and the rear end portion 11 of the outer joint member 10 is press-fitted.

また、ブーツ取付具６０の前端部６１には、径方向内側にかしめて突出された爪部６１ａが形成される。ブーツ取付具６０は、外側継手部材１０の後端部１１の外周面１３に形成された溝部１３ａに爪部６１ａが嵌合されることで、外側継手部材１０から抜けないように抜け止めされる。 Further, a claw portion 61a that is caulked inward in the radial direction is formed at the front end portion 61 of the boot attachment 60. The boot fitting 60 is prevented from coming off from the outer joint member 10 by fitting the claw portion 61a into the groove portion 13a formed on the outer peripheral surface 13 of the rear end portion 11 of the outer joint member 10. ..

ブーツ取付具６０の後端部６２には、径方向内側から前方に折り返されたヘアピン状のクリップ部６２ａが形成される。クリップ部６２ａは、ブーツ取付具６０の周方向に全周に亘って形成される。 A hairpin-shaped clip portion 62a that is folded forward from the inside in the radial direction is formed at the rear end portion 62 of the boot attachment 60. The clip portion 62a is formed over the entire circumference in the circumferential direction of the boot attachment 60.

ブーツ３０は、ゴム材料で形成される。ブーツ３０は、ブーツ取付具６０のクリップ部６２ａに嵌合固定されるリング状のブーツ基端部３１と、前側軸部２の外周面に嵌合されるリング状のブーツ先端部３２と、ブーツ基端部３１とブーツ先端部３２とを接続する管状のブーツ壁部３３と、を備える。 The boot 30 is made of a rubber material. The boot 30 includes a ring-shaped boot base end portion 31 fitted and fixed to the clip portion 62a of the boot attachment 60, a ring-shaped boot tip portion 32 fitted to the outer peripheral surface of the front shaft portion 2, and the boot. A tubular boot wall portion 33 that connects the base end portion 31 and the boot tip portion 32 is provided.

ブーツ基端部３１は、クリップ部６２ａに弾性的に挟まれて嵌合される。また、ブーツ基端部３１は、クリップ部６２ａを径方向の外側または内側からかしめることで、クリップ部６２ａから抜けないように抜け止めされる。ブーツ先端部３２は、ブーツ基端部３１よりも後方の位置に配置され、バンド部材３４により外周側から締め付けられて前側軸部２に固定される。 The boot base end portion 31 is elastically sandwiched and fitted to the clip portion 62a. Further, the boot base end portion 31 is prevented from coming off from the clip portion 62a by crimping the clip portion 62a from the outside or the inside in the radial direction. The boot tip portion 32 is arranged at a position rearward from the boot base end portion 31, and is tightened from the outer peripheral side by the band member 34 to be fixed to the front shaft portion 2.

ブーツ壁部３３は、ブーツ基端部３１側からブーツ先端部３２側にかけて順次縮径するように形成される。また、ブーツ壁部３３は、ブーツ基端部３１側の部分が前方から後方に折り返されて断面Ｊ字状に形成される。 The boot wall portion 33 is formed so as to sequentially reduce the diameter from the boot base end portion 31 side to the boot tip portion 32 side. Further, the boot wall portion 33 is formed in a J-shaped cross section by folding back a portion on the boot base end portion 31 side from the front to the rear.

図６及び図７に示すように、シール部材４０は、ゴム材料で形成される。シール部材４０は、外側継手部材１０の後端部に嵌合固定されるリング状の基端部としてのシール基端部４１と、前側軸部２の外周面に摺動自在に嵌合されるリング状の先端部としてのシール先端部４２と、シール基端部４１とシール先端部４２とを接続する中間壁部４３としての管状のテーパ部４３ａと、を備える。 As shown in FIGS. 6 and 7, the sealing member 40 is made of a rubber material. The seal member 40 is slidably fitted to the outer peripheral surface of the front shaft portion 2 and the seal base end portion 41 as a ring-shaped base end portion that is fitted and fixed to the rear end portion of the outer joint member 10. A seal tip 42 as a ring-shaped tip and a tubular tapered portion 43a as an intermediate wall 43 connecting the seal base end 41 and the seal tip 42 are provided.

本実施形態のシール部材４０は、シール基端部４１、シール先端部４２及びテーパ部４３ａにより、外側継手部材１０の後端部１１と前側軸部２との間を全周に亘って隙間なく塞いでいる。本実施形態において、「塞ぐ」とは、このように全周に亘って隙間なく塞ぐことを意味する。これにより、後述するグリースＧの漏れを抑制できる。 In the seal member 40 of the present embodiment, there is no gap over the entire circumference between the rear end portion 11 and the front shaft portion 2 of the outer joint member 10 by the seal base end portion 41, the seal tip portion 42, and the tapered portion 43a. It's blocking. In the present embodiment, "closing" means closing without a gap over the entire circumference in this way. As a result, leakage of grease G, which will be described later, can be suppressed.

具体的には、シール基端部４１は、外側継手部材１０の後側拡径部１４ａの内径よりも僅かに大きい外径を有し、後側拡径部１４ａに後方から圧入される。これにより、シール基端部４１は、外側継手部材１０の後端部１１に対して、隙間を生じることなく密着した状態で固定される。 Specifically, the seal base end portion 41 has an outer diameter slightly larger than the inner diameter of the rear diameter enlarged portion 14a of the outer joint member 10, and is press-fitted into the rear diameter expanded portion 14a from the rear. As a result, the seal base end portion 41 is fixed to the rear end portion 11 of the outer joint member 10 in a state of being in close contact with the rear end portion 11 without creating a gap.

また、シール基端部４１は、円筒状に形成される。これにより、シール基端部４１と後側拡径部１４ａとの接触面積を十分に確保でき、シール基端部４１を後側拡径部１４ａに確実に密着させて固定できる。 Further, the seal base end portion 41 is formed in a cylindrical shape. As a result, a sufficient contact area between the seal base end portion 41 and the rear diameter enlarged portion 14a can be sufficiently secured, and the seal base end portion 41 can be securely adhered to and fixed to the rear diameter enlarged portion 14a.

シール基端部４１の内部には、補強部材として金属製または樹脂製のリング部材４１ａが埋設される。これにより、シール基端部４１の変形が抑えられ、シール基端部４１と後側拡径部１４ａとの間に隙間が生じたり、シール部材４０が後側拡径部１４ａから抜けるのを抑制できる。 A metal or resin ring member 41a is embedded as a reinforcing member inside the seal base end portion 41. As a result, deformation of the seal base end portion 41 is suppressed, a gap is generated between the seal base end portion 41 and the rear diameter expansion portion 14a, and the seal member 40 is suppressed from coming off from the rear diameter expansion portion 14a. it can.

シール先端部４２は、シール基端部４１よりも後方に配置される。また、シール先端部４２は、前側軸部２の外周面に対して摺動可能な大きさの内径を有し、前側軸部２の外周面に対して全周に亘って密着される（図７を参照）。これにより、シール先端部４２と前側軸部２の間に隙間が生じるのを抑制できる。 The seal tip 42 is arranged behind the seal base 41. Further, the seal tip portion 42 has an inner diameter that is slidable with respect to the outer peripheral surface of the front shaft portion 2, and is in close contact with the outer peripheral surface of the front shaft portion 2 over the entire circumference (FIG. 7). As a result, it is possible to suppress the formation of a gap between the seal tip portion 42 and the front shaft portion 2.

また、シール先端部４２は、円筒状に形成される。これにより、シール先端部４２と前側軸部２との接触面積を十分に確保でき、シール先端部４２を前側軸部２に確実に密着させて摺動できる。 Further, the seal tip portion 42 is formed in a cylindrical shape. As a result, a sufficient contact area between the seal tip portion 42 and the front shaft portion 2 can be secured, and the seal tip portion 42 can be reliably brought into close contact with the front shaft portion 2 and slid.

テーパ部４３ａは、後方に向かうにつれ順次縮径するように形成される。また、テーパ部４３ａは、断面円弧状に形成されており、径方向内側かつ斜め前方に向かって出っ張るように湾曲した円弧状の断面形状を有する。但し、テーパ部４３ａは、断面直線状に形成されていても良い。また、本実施形態のテーパ部４３ａは、全周に亘って隙間なく形成される。 The tapered portion 43a is formed so as to gradually reduce its diameter toward the rear. Further, the tapered portion 43a is formed in an arcuate cross-sectional shape, and has an arcuate cross-sectional shape curved inward in the radial direction and protruding diagonally forward. However, the tapered portion 43a may be formed with a straight cross section. Further, the tapered portion 43a of the present embodiment is formed without a gap over the entire circumference.

また、本実施形態のシール部材４０は、内側継手部材２０が外側継手部材１０の中心軸Ｃ１に対して傾動したときに（図５を参照）、前側軸部２に追従できる最適な厚さ及び硬度に設定される。 Further, the seal member 40 of the present embodiment has an optimum thickness and an optimum thickness that can follow the front shaft portion 2 when the inner joint member 20 is tilted with respect to the central axis C1 of the outer joint member 10 (see FIG. 5). Set to hardness.

また、シール部材４０は、ブーツ３０から前方に離間されて配置され、特に、内側継手部材２０が外側継手部材１０の中心軸Ｃ１に対して傾動したときでも（図５を参照）、ブーツ３０に接触しないような位置に配置される。これにより、ブーツ３０及びシール部材４０の摩耗や破損を抑制できる。 Further, the seal member 40 is arranged so as to be separated from the boot 30 in the front, and particularly even when the inner joint member 20 is tilted with respect to the central axis C1 of the outer joint member 10 (see FIG. 5), the boot 30 It is placed in a position where it does not touch. As a result, wear and breakage of the boot 30 and the seal member 40 can be suppressed.

図３に戻って、蓋部材５０は、プレス鋼材または樹脂材料からなり、円盤状に形成され、外側継手部材１０と同軸に配置される。蓋部材５０の外周部５０ａは、円筒状に形成されており、外側継手部材１０の前側拡径部１４ｂに嵌合されて固定される。 Returning to FIG. 3, the lid member 50 is made of a pressed steel material or a resin material, is formed in a disk shape, and is arranged coaxially with the outer joint member 10. The outer peripheral portion 50a of the lid member 50 is formed in a cylindrical shape, and is fitted and fixed to the front side enlarged diameter portion 14b of the outer joint member 10.

蓋部材５０には、その内側と外側とを連通する通気孔５１が形成される。通気孔５１は、蓋部材５０の径方向の中心部分に設けられる。また、蓋部材５０には、外側継手部材１０の内部（蓋部材５０の内側）の圧力に応じて通気孔５１を開閉するブリーザ弁５２が取り付けられる。 The lid member 50 is formed with a ventilation hole 51 that communicates the inside and the outside thereof. The ventilation hole 51 is provided at the center portion in the radial direction of the lid member 50. Further, a breather valve 52 that opens and closes the ventilation hole 51 according to the pressure inside the outer joint member 10 (inside the lid member 50) is attached to the lid member 50.

ブリーザ弁５２は、ゴム材料からなり、円盤状に形成され、通気孔５１に嵌合固定される。また、ブリーザ弁５２の径方向の中央部分には、軸方向に貫通するスリット５２ａ（図８を参照）が形成される。 The breather valve 52 is made of a rubber material, is formed in a disk shape, and is fitted and fixed in the ventilation hole 51. Further, a slit 52a (see FIG. 8) penetrating in the axial direction is formed in the central portion of the breather valve 52 in the radial direction.

ブリーザ弁５２は、外側継手部材１０の内部の圧力が所定値未満のとき（通常時）に、スリット５２ａが閉じるように構成される。これにより、外側継手部材１０の内部のグリースＧが漏れ出すのを抑制できる。 The breather valve 52 is configured to close the slit 52a when the pressure inside the outer joint member 10 is less than a predetermined value (normal time). As a result, it is possible to prevent the grease G inside the outer joint member 10 from leaking out.

また、ブリーザ弁５２は、外側継手部材１０の内部の圧力が所定値以上のときに、スリット５２ａが開くように構成される。これにより、スリット５２ａを通じて、外側継手部材１０の内部から変速機の出力軸４の内部に空気が排出され、外側継手部材１０の内部の圧力が下がる。外側継手部材１０の内部の圧力が上昇すると、シール先端部４２と前側軸部２との間に隙間が生じ、この隙間からグリースＧが漏れ出す可能性があるが、本実施形態であれば、圧力を下げられるので、隙間が生じてグリースＧが漏れ出すのを抑制できる。なお、出力軸４の壁部には、出力軸４の内部に排出された空気を大気に放出するための貫通孔（不図示）が形成される。 Further, the breather valve 52 is configured to open the slit 52a when the pressure inside the outer joint member 10 is equal to or higher than a predetermined value. As a result, air is discharged from the inside of the outer joint member 10 to the inside of the output shaft 4 of the transmission through the slit 52a, and the pressure inside the outer joint member 10 is lowered. When the pressure inside the outer joint member 10 rises, a gap is created between the seal tip portion 42 and the front shaft portion 2, and grease G may leak from this gap. Since the pressure can be lowered, it is possible to prevent the grease G from leaking due to a gap. A through hole (not shown) for releasing the air discharged inside the output shaft 4 to the atmosphere is formed in the wall portion of the output shaft 4.

ところで、図示しないが、一般的な等速自在継手では、ブーツの内側にシール部材が設けられていない。そのため、例えば、車両の走行中、プロペラシャフトの回転による遠心力や、外側継手部材の内部の圧力によって、外側継手部材の内部からグリースが移動し、ブーツの内壁にグリースが付着する場合がある。特に、車両のプロペラシャフトでは、例えばドライブシャフトに比べて回転速度が高く、遠心力や外側継手部材の内部の圧力が大きいので、グリースが移動してブーツに付着し易い。 By the way, although not shown, in a general constant velocity universal joint, a sealing member is not provided inside the boot. Therefore, for example, while the vehicle is running, the grease may move from the inside of the outer joint member due to the centrifugal force due to the rotation of the propeller shaft or the pressure inside the outer joint member, and the grease may adhere to the inner wall of the boot. In particular, the propeller shaft of a vehicle has a higher rotation speed than, for example, a drive shaft, and the centrifugal force and the pressure inside the outer joint member are large, so that the grease easily moves and adheres to the boot.

そして、ブーツの内壁にグリースが付着すると、ブーツに掛かる遠心力がグリースの重みで増加して、ブーツに変形が生じ、ブーツの寿命が低下する虞がある。 When grease adheres to the inner wall of the boot, the centrifugal force applied to the boot increases due to the weight of the grease, which may cause deformation of the boot and shorten the life of the boot.

また、外側継手部材等の接触面における摩擦係数を低減するためには、外側継手部材の内部に充填されるグリースの量を、空間容積に対して所定の充填率を満たすように適正に設定する必要がある。しかし、充填されるグリースの量を適正に設定した場合でも、ブーツの内壁に付着するグリースが存在し、また、ブーツの一部に偏在する場合がある。その結果、ブーツが局部的に変形してブーツ取付具に接触し、ブーツの摩耗や破損を生じさせる虞もある。 Further, in order to reduce the friction coefficient on the contact surface of the outer joint member or the like, the amount of grease filled inside the outer joint member is appropriately set so as to satisfy a predetermined filling rate with respect to the space volume. There is a need. However, even if the amount of grease to be filled is set appropriately, some grease may be present on the inner wall of the boot and may be unevenly distributed on a part of the boot. As a result, the boot may be locally deformed and come into contact with the boot fitting, causing wear or breakage of the boot.

また、ブーツ内壁に付着したグリースの成分によってブーツが劣化する可能性もある。 In addition, the boot may be deteriorated by the component of grease adhering to the inner wall of the boot.

他方、上記のようなブーツの破損や劣化等を抑制するためには、ブーツの材質として耐久性や耐油性の高いゴムや樹脂材料を選択する必要があるが、製造コストが高くなる虞がある。 On the other hand, in order to suppress damage or deterioration of the boot as described above, it is necessary to select a rubber or resin material having high durability and oil resistance as the material of the boot, but the manufacturing cost may increase. ..

これに対して、図３に示したように、本実施形態の前側自在継手１００では、シール部材４０によりグリースＧの後方への移動を規制できるので、ブーツ３０の内壁にグリースＧが付着するのを抑制できる。これにより、ブーツの変形が抑えられ、ブーツの寿命の低下を抑制できる。 On the other hand, as shown in FIG. 3, in the front universal joint 100 of the present embodiment, the movement of the grease G to the rear can be restricted by the sealing member 40, so that the grease G adheres to the inner wall of the boot 30. Can be suppressed. As a result, deformation of the boot can be suppressed, and a decrease in the life of the boot can be suppressed.

また、ブーツ３０の変形が抑えられることで、ブーツ取付具６０との接触によるブーツ３０の摩耗や破損をも抑制できる。 Further, by suppressing the deformation of the boot 30, it is possible to suppress the wear and breakage of the boot 30 due to the contact with the boot attachment 60.

また、ブーツ３０へのグリースＧの付着による耐久性の低下を考慮することなく、外側継手部材１０の内部に充填されるグリースの量を適正に設定できるので、外側継手部材１０等の接触面における摩擦係数の低減に有利である。 Further, since the amount of grease filled inside the outer joint member 10 can be appropriately set without considering the decrease in durability due to the adhesion of the grease G to the boot 30, the contact surface of the outer joint member 10 or the like can be set appropriately. It is advantageous for reducing the friction coefficient.

また、ブーツ３０の内壁へのグリースＧの付着が抑制されることで、グリースＧの成分によるブーツ３０の劣化をも抑制でき、耐油性を確保するために選択できなかったブーツ３０の材質を選択することで、耐熱性や耐環境性等を高くし、耐久性を向上させることができる。 Further, by suppressing the adhesion of the grease G to the inner wall of the boot 30, the deterioration of the boot 30 due to the component of the grease G can be suppressed, and the material of the boot 30 which could not be selected in order to secure the oil resistance is selected. By doing so, heat resistance, environmental resistance, and the like can be increased, and durability can be improved.

更に、ブーツ３０の材質として耐油性の比較的低い材質を選択することもできるので、ブーツ３０の材質の選択において、製造コストを削減できる。 Further, since a material having a relatively low oil resistance can be selected as the material of the boot 30, the manufacturing cost can be reduced in selecting the material of the boot 30.

また、本実施形態のシール部材４０は、シール基端部４１、シール先端部４２及びテーパ部４３ａにより、外側継手部材１０の後端部１１と前側軸部２との間を全周に亘って隙間なく塞いでいる。図示しないが、例えば、比較例として、シール部材４０のシール先端部４２と前側軸部２との間に隙間が形成されている場合には、この隙間からグリースＧが漏れてブーツ３０の内壁にグリースＧが付着する可能性が高い。 Further, in the seal member 40 of the present embodiment, the seal base end portion 41, the seal tip portion 42, and the tapered portion 43a cover the entire circumference between the rear end portion 11 and the front shaft portion 2 of the outer joint member 10. It is closed without any gaps. Although not shown, for example, when a gap is formed between the seal tip portion 42 of the seal member 40 and the front shaft portion 2, grease G leaks from this gap and reaches the inner wall of the boot 30. There is a high possibility that grease G will adhere.

これに対して、本実施形態では、このような隙間がなく、グリースＧの漏れを確実に抑制できる。その結果、ブーツ３０の内壁にグリースＧが付着をするのを確実に抑制できる。 On the other hand, in the present embodiment, there is no such gap, and leakage of grease G can be reliably suppressed. As a result, it is possible to reliably prevent the grease G from adhering to the inner wall of the boot 30.

また、本実施形態のシール部材４０では、外側継手部材１０の中心軸Ｃ１に対して内側継手部材２０が傾動したときに、テーパ部４３ａが前側軸部２に追従して変形する（図５を参照）。これにより、シール先端部４２と前側軸部２との間に隙間を生じるのを抑制できる。 Further, in the seal member 40 of the present embodiment, when the inner joint member 20 is tilted with respect to the central axis C1 of the outer joint member 10, the tapered portion 43a is deformed following the front shaft portion 2 (FIG. 5). reference). As a result, it is possible to suppress the formation of a gap between the seal tip portion 42 and the front shaft portion 2.

また、本実施形態のシール先端部４２は、前側軸部２の外周面に対して摺動する。これにより、テーパ部４３ａを前側軸部２に追従して変形させ易くできる。 Further, the seal tip portion 42 of the present embodiment slides with respect to the outer peripheral surface of the front shaft portion 2. As a result, the tapered portion 43a can be easily deformed by following the front shaft portion 2.

また、テーパ部４３ａは、断面円弧状に形成されているため、湾曲した方向に変形させ易くでき、また、変形可能な余長を十分に確保できる。また、テーパ部４３ａは、径方向内側かつ斜め前方に向かって出っ張るように湾曲しているため、前方から後方に折り返されたブーツ壁部３３に対して接触し難くできる。 Further, since the tapered portion 43a is formed in an arc shape in cross section, it can be easily deformed in a curved direction, and a sufficient extra length that can be deformed can be secured. Further, since the tapered portion 43a is curved so as to protrude inward in the radial direction and diagonally forward, it is possible to make it difficult to contact the boot wall portion 33 folded back from the front.

また、本実施形態では、シール部材４０及び蓋部材５０により、外側継手部材１０の内部にグリースＧを密封しつつ、蓋部材５０の通気孔５１を通じて外側継手部材１０の内部から空気を逃がすことができる。これにより、外側継手部材１０の内部の圧力上昇を抑制でき、圧力によってシール先端部４２と前側軸部２との隙間からグリースＧが漏れ出すのを抑制できる。 Further, in the present embodiment, the seal member 40 and the lid member 50 seal the grease G inside the outer joint member 10, and allow air to escape from the inside of the outer joint member 10 through the ventilation holes 51 of the lid member 50. it can. As a result, the pressure rise inside the outer joint member 10 can be suppressed, and the grease G can be suppressed from leaking from the gap between the seal tip portion 42 and the front shaft portion 2 due to the pressure.

また、本実施形態の通気孔５１には、ブリーザ弁５２が設けられる。ブリーザ弁５２によれば、通常時は、スリット５２ａが閉じられることで、通気孔５１からグリースＧが漏れ出すのを確実に抑制できる。また、外側継手部材１０の内部の圧力が所定値以上になったときは、スリット５２ａが開かれることで、空気を逃がして圧力を低下させることができる。 Further, the breather valve 52 is provided in the ventilation hole 51 of the present embodiment. According to the breather valve 52, the slit 52a is normally closed, so that the grease G can be reliably suppressed from leaking from the ventilation hole 51. Further, when the pressure inside the outer joint member 10 exceeds a predetermined value, the slit 52a is opened so that air can escape and the pressure can be reduced.

以上、本開示の基本実施形態を詳細に述べたが、本開示は以下のような変形例またはそれら変形例の組み合わせとすることができる。なお、下記の変形例では、上記の基本実施形態と共通する構成要素については同一の符号を用い、それらの詳細な説明は省略する。 Although the basic embodiments of the present disclosure have been described in detail above, the present disclosure can be a modified example or a combination of the following modified examples. In the following modification, the same reference numerals are used for the components common to the above basic embodiments, and detailed description thereof will be omitted.

（第１変形例）
シール部材４０の形状は、任意であって良い。例えば、図９に示すように、第１変形例の中間壁部４３は、シール基端部４１の前端部から径方向内側に延出された円環状の平板部４３ｂと、平板部４３ｂの内周端とシール先端部４２の後端とを接続する管状のテーパ部４３ｃと、を有する。また、第１変形例の平板部４３ｂ及びテーパ部４３ｃは、それぞれ断面直線状に形成される。 (First modification)
The shape of the seal member 40 may be arbitrary. For example, as shown in FIG. 9, the intermediate wall portion 43 of the first modified example includes an annular flat plate portion 43b extending radially inward from the front end portion of the seal base end portion 41 and the flat plate portion 43b. It has a tubular tapered portion 43c that connects the peripheral end and the rear end of the seal tip portion 42. Further, the flat plate portion 43b and the tapered portion 43c of the first modification are each formed to have a linear cross section.

（第２変形例）
シール部材４０の取付方法は、任意であって良い。例えば、図１０に示すように、第２変形例のシール部材４０は、シール基端部４１の外周面から径方向外側に突出された爪部４１ｂを有する。また、第２変形例の外側継手部材１０は、後側拡径部１４ａの内周面に形成された溝部１４ｄを有する。爪部４１ｂ及び溝部１４ｄは、周方向に１周するリング状にそれぞれ形成され、互いに係合する。 (Second modification)
The method of attaching the seal member 40 may be arbitrary. For example, as shown in FIG. 10, the seal member 40 of the second modification has a claw portion 41b protruding radially outward from the outer peripheral surface of the seal base end portion 41. Further, the outer joint member 10 of the second modification has a groove portion 14d formed on the inner peripheral surface of the rear side enlarged diameter portion 14a. The claw portion 41b and the groove portion 14d are each formed in a ring shape that makes one round in the circumferential direction, and engage with each other.

第２変形例であれば、シール基端部４１に補強部材を設けなくても、シール部材４０が外側継手部材１０から抜けないように抜け止めできる。 In the second modification, the seal member 40 can be prevented from coming off from the outer joint member 10 without providing a reinforcing member at the seal base end portion 41.

（第３変形例）
図１１に示すように、第３変形例では、等速自在継手として、図１に示した後側自在継手３００が用いられる。なお、第３変形例では、第２シャフトとしての後側軸部３側が前方となり、第１シャフトとしての入力シャフト５側が後方となる。 (Third modification example)
As shown in FIG. 11, in the third modification, the rear universal joint 300 shown in FIG. 1 is used as the constant velocity universal joint. In the third modification, the rear shaft portion 3 side as the second shaft is the front side, and the input shaft 5 side as the first shaft is the rear side.

後側自在継手３００は、摺動式の等速自在継手であり、外側トラック溝１４ｃが前後方向に直線状に延びるように形成される。また、後側自在継手３００は、前側自在継手１００に対して前後方向に反転して配置されており、後側自在継手３００のフランジ３０は、ファイナルギアの入力軸５の前端部に形成されたフランジ部５ａに締結される。なお、第３変形例の入力軸５は、前端部が開口された中空状に形成されており、入力軸５の壁部には、スリット５２ａから入力軸５の内部に排出された空気を大気に放出するための貫通孔（不図示）が形成される。 The rear universal joint 300 is a sliding constant velocity universal joint, and is formed so that the outer track groove 14c extends linearly in the front-rear direction. Further, the rear universal joint 300 is arranged so as to be inverted in the front-rear direction with respect to the front universal joint 100, and the flange 30 of the rear universal joint 300 is formed at the front end portion of the input shaft 5 of the final gear. It is fastened to the flange portion 5a. The input shaft 5 of the third modification is formed in a hollow shape with an open front end portion, and the air discharged from the slit 52a into the inside of the input shaft 5 is introduced to the atmosphere on the wall portion of the input shaft 5. A through hole (not shown) is formed for discharge to the air.

（第４変形例）
図示しないが、シール部材の材質、厚さ及び硬度は、任意であって良い。例えば、第４変形例のシール部材は、柔軟性のあるナイロン等の樹脂材料で形成される。 (Fourth modification)
Although not shown, the material, thickness and hardness of the sealing member may be arbitrary. For example, the sealing member of the fourth modification is formed of a flexible resin material such as nylon.

（第５変形例）
シール部材は、内側継手部材が大きく傾動したときに、ブーツに接触可能な位置に配置されても良い。但し、この場合には、ブーツの保護を優先し、シール部材を薄く柔軟に形成することが好ましい。 (Fifth modification)
The seal member may be arranged at a position where it can come into contact with the boot when the inner joint member is greatly tilted. However, in this case, it is preferable to give priority to the protection of the boot and to form the sealing member thinly and flexibly.

（第６変形例）
ブーツの種類、形状、取付方法等は、任意であって良い。例えば、第６変形例のブーツ壁部は、前方から後方に折り返されておらず、蛇腹状に形成される。また、第６変形例では、ブーツ取付具が省略され、ブーツが外側継手部材の端部に直接取り付けられる。 (6th modification)
The type, shape, mounting method, etc. of the boots may be arbitrary. For example, the boot wall portion of the sixth modification is not folded back from the front to the rear, but is formed in a bellows shape. Further, in the sixth modification, the boot attachment is omitted, and the boot is directly attached to the end of the outer joint member.

（第７変形例）
等速自在継手の種類、位置、形状等は、任意であって良く、例えば、ダブルオフセット型、トリポード型、またはレブロ型の等速ジョイントであっても良い。 (7th modification)
The type, position, shape, etc. of the constant velocity universal joint may be arbitrary, and may be, for example, a double offset type, tripod type, or rebro type constant velocity joint.

また、上述した前側自在継手、中間自在継手及び後側自在継手のうち、何れか１つまたは２つの自在継手は、ユニバーサルジョイント等であっても良い。また、等速自在継手は、車両のドライブシャフト等に用いられても良い。 Further, any one or two of the above-mentioned front universal joints, intermediate universal joints and rear universal joints may be universal joints or the like. Further, the constant velocity universal joint may be used for a drive shaft of a vehicle or the like.

前述の各実施形態の構成は、特に矛盾が無い限り、部分的にまたは全体的に組み合わせることが可能である。本開示の実施形態は前述の実施形態のみに限らず、特許請求の範囲によって規定される本開示の思想に包含されるあらゆる変形例や応用例、均等物が本開示に含まれる。従って本開示は、限定的に解釈されるべきではなく、本開示の思想の範囲内に帰属する他の任意の技術にも適用することが可能である。 The configurations of each of the above embodiments can be combined partially or wholly, unless otherwise inconsistent. The embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications, applications, and equivalents included in the ideas of the present disclosure defined by the claims are included in the present disclosure. Therefore, the present disclosure should not be construed in a limited manner and may be applied to any other technique belonging within the scope of the ideas of the present disclosure.

１ プロペラシャフト
２ 前側軸部（第２シャフト）
４ 変速機の出力軸（第１シャフト）
１０ 外側継手部材
２０ 内側継手部材
３０ ブーツ
４０ シール部材
５０ 蓋部材
５１ 通気孔
５２ ブリーザ弁
６０ ブーツ取付具
１００ 前側自在継手（等速自在継手） 1 Propeller shaft 2 Front shaft (second shaft)
4 Transmission output shaft (first shaft)
10 Outer joint member 20 Inner joint member 30 Boot 40 Seal member 50 Lid member 51 Vent hole 52 Breather valve 60 Boot fitting 100 Front universal joint (constant speed universal joint)

Claims (5)

第１シャフトと第２シャフトとを直列に接続する等速自在継手であって、
前記第１シャフトに結合され、内部が潤滑材で潤滑される筒状の外側継手部材と、
前記第２シャフトに結合され、前記外側継手部材の内部に配置された内側継手部材と、
前記外側継手部材の前記第２シャフト側の端部と前記第２シャフトとの間を塞ぐブーツと、
前記ブーツの内側で前記外側継手部材の前記第２シャフト側の端部と前記第２シャフトとの間を塞ぐシール部材と、を備える
ことを特徴とする等速自在継手。 A constant velocity universal joint that connects the first shaft and the second shaft in series.
A tubular outer joint member that is coupled to the first shaft and whose inside is lubricated with a lubricant.
With the inner joint member coupled to the second shaft and arranged inside the outer joint member,
A boot that closes between the end of the outer joint member on the second shaft side and the second shaft.
A constant velocity universal joint comprising, inside the boot, a sealing member that closes between the end of the outer joint member on the second shaft side and the second shaft. 前記シール部材は、
前記外側継手部材の前記第２シャフト側の端部に嵌合固定されるリング状の基端部と、
前記第２シャフトの外周面に摺動自在に嵌合されるリング状の先端部と、
前記基端部と前記先端部とを接続する中間壁部と、を備え、
前記中間壁部は、前記外側継手部材の軸方向の前記第２シャフト側に向かうにつれ順次縮径する管状のテーパ部を有する
請求項１に記載の等速自在継手。 The seal member is
A ring-shaped base end portion fitted and fixed to the end portion on the second shaft side of the outer joint member, and a ring-shaped base end portion.
A ring-shaped tip that is slidably fitted to the outer peripheral surface of the second shaft,
An intermediate wall portion for connecting the base end portion and the tip end portion is provided.
The constant velocity universal joint according to claim 1, wherein the intermediate wall portion has a tubular tapered portion whose diameter is gradually reduced toward the second shaft side in the axial direction of the outer joint member. 前記テーパ部は、断面円弧状または直線状に形成されている
請求項２に記載の等速自在継手。 The constant velocity universal joint according to claim 2, wherein the tapered portion is formed in an arcuate or linear cross section. 前記外側継手部材の前記第１シャフト側の端部を塞ぐ蓋部材と、
前記蓋部材の内側と外側とを連通する通気孔と、を更に備える
請求項１〜３何れか一項に記載の等速自在継手。 A lid member that closes the end of the outer joint member on the first shaft side, and
The constant velocity universal joint according to any one of claims 1 to 3, further comprising a vent hole for communicating the inside and the outside of the lid member. 車両のプロペラシャフトに用いられる
請求項１〜４何れか一項に記載の等速自在継手。 The constant velocity universal joint according to any one of claims 1 to 4, which is used for a propeller shaft of a vehicle.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01148126U (en) * 1988-03-31 1989-10-13
JP2009058079A (en) * 2007-08-31 2009-03-19 Ntn Corp Constant velocity universal joint
JP2009180372A (en) * 2008-02-01 2009-08-13 Ntn Corp Constant velocity universal joint boot
JP2015113875A (en) * 2013-12-10 2015-06-22 Ntn株式会社 Constant velocity universal joint

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8287393B2 (en) 2005-06-13 2012-10-16 Duc Dao Inner seal for CV joint boot

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01148126U (en) * 1988-03-31 1989-10-13
JP2009058079A (en) * 2007-08-31 2009-03-19 Ntn Corp Constant velocity universal joint
JP2009180372A (en) * 2008-02-01 2009-08-13 Ntn Corp Constant velocity universal joint boot
JP2015113875A (en) * 2013-12-10 2015-06-22 Ntn株式会社 Constant velocity universal joint

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