JP2007247845A - Constant velocity universal joint - Google Patents

Constant velocity universal joint Download PDF

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Publication number
JP2007247845A
JP2007247845A JP2006074867A JP2006074867A JP2007247845A JP 2007247845 A JP2007247845 A JP 2007247845A JP 2006074867 A JP2006074867 A JP 2006074867A JP 2006074867 A JP2006074867 A JP 2006074867A JP 2007247845 A JP2007247845 A JP 2007247845A
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joint
boot
outer peripheral
peripheral surface
diameter end
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Katsuhiro Suzuki
勝博 鈴木
Mikio Tomiyama
幹男 富山
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent leakage of grease from the inside of a joint and intrusion of water into the inside of the joint through a ventilation hole provided in boots. <P>SOLUTION: This constant velocity universal joint is provided with an inner ring 21 forming a plurality of linear track grooves 21a on a projecting spherical outer peripheral face and connecting one end of a shaft 25 with an inside diameter hole, a plurality of balls 23 provided between the track grooves 21a and 22a of inner and outer rings 21, 22 to transmit torque, a cage 24 provided between the inner ring 21 and the outer ring 22 to hold the balls 23, and flexible boots 28 for sealing the inside of the joint by fitting a large diameter end part 28a into an outer peripheral face of the outer ring 22 and fitting a small diameter end part 28b into an outer peripheral face of the shaft 25. A ventilation hole 41 is formed in a part 28b<SB>1</SB>close to an inner ring side of the small diameter end part 28b of the boots 28 in the axial direction, an inside diameter face side 41a of the ventilation hole 41 is joined with the outer peripheral face of the shaft 25 to block it, and the inside diameter face side 41a of the ventilation hole 41 is opened by expansion of the boots 28 onto an outer side in the radial direction by rotation of the joint. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は等速自在継手に関し、例えば4WD車やFR車などにおいてトランスミッションからディファレンシャルへ回転駆動力を伝達するプロペラシャフトに用いられ、継手内部を密封するためのブーツを具備した等速自在継手に関する。   The present invention relates to a constant velocity universal joint and, for example, to a constant velocity universal joint having a boot for sealing the inside of the joint, which is used in a propeller shaft that transmits rotational driving force from a transmission to a differential in 4WD vehicles, FR vehicles, and the like.

例えば、FR車では、エンジン、クラッチ、変速機(トランスミッション)が前方に、減速歯車装置(ディファレンシャル)、駆動車軸が後方にそれぞれ配置されているため、この間の動力伝達にプロペラシャフトを用いるのが一般的である。また、FRベースの4WD車では、リアプロペラシャフトとフロントプロペラシャフトが必要である。これらプロペラシャフトは、トランスミッションとディファレンシャル(以下、単にデフと称す)間の相対位置変化による長さと角度変化に対応するために等速自在継手を具備する。   For example, in an FR vehicle, an engine, a clutch, a transmission (transmission) are arranged in the front, a reduction gear device (differential), and a drive axle are arranged in the rear. Therefore, a propeller shaft is generally used for power transmission between them. Is. In addition, the FR-based 4WD vehicle requires a rear propeller shaft and a front propeller shaft. These propeller shafts are provided with constant velocity universal joints to cope with changes in length and angle due to a relative position change between the transmission and a differential (hereinafter simply referred to as a differential).

通常、プロペラシャフトには、車両全体の重量軽減という観点から、軽量で、しかも回転バランスおよび振動特性がよいレブロ型(あるいはクロスグルーブ型)と称される摺動式等速自在継手が採用される。このレブロ型等速自在継手は、衝突時の軸方向衝撃によるトランスミッションとデフ間の軸方向変位を吸収できる構造を具備する。   Usually, a propeller shaft uses a slidable constant velocity universal joint called a Lebro type (or a cross groove type) that is lightweight and has good rotational balance and vibration characteristics from the viewpoint of reducing the weight of the entire vehicle. . This Lebro type constant velocity universal joint has a structure capable of absorbing the axial displacement between the transmission and the differential due to the axial impact at the time of collision.

図4はレブロ型等速自在継手の一例を示す。この等速自在継手は、内輪1、外輪2、ボール3およびケージ4を主要な部品として構成されている。内輪1は、その外周面に複数のトラック溝1aが形成される。この内輪1の中心孔にスタブシャフト5の軸部5aをスプライン嵌合により連結することによりトルク伝達を可能にしている。このスタブシャフト5はスナップリング6により内輪1に対して抜け止めされている。   FIG. 4 shows an example of a Lebro type constant velocity universal joint. The constant velocity universal joint includes an inner ring 1, an outer ring 2, a ball 3 and a cage 4 as main components. The inner ring 1 has a plurality of track grooves 1a formed on the outer peripheral surface thereof. Torque transmission is enabled by connecting the shaft portion 5a of the stub shaft 5 to the center hole of the inner ring 1 by spline fitting. The stub shaft 5 is prevented from coming off from the inner ring 1 by a snap ring 6.

外輪2は内輪1の外周に位置し、内周面に内輪1のトラック溝1aと同数のトラック溝2aが形成される。内輪1のトラック溝1aと外輪2のトラック溝2aは、軸線に対して反対方向に傾斜した角度をなし、対をなす内輪1のトラック溝1aと外輪2のトラック溝2aとの交叉部にボール3が組み込まれる。内輪1と外輪2の間にケージ4が配置され、ボール3はケージ4のポケット4a内に保持される。   The outer ring 2 is located on the outer periphery of the inner ring 1, and the same number of track grooves 2a as the track grooves 1a of the inner ring 1 are formed on the inner peripheral surface. The track groove 1a of the inner ring 1 and the track groove 2a of the outer ring 2 form an angle inclined in the opposite direction with respect to the axis, and a ball is formed at the intersection of the pair of the track groove 1a of the inner ring 1 and the track groove 2a of the outer ring 2 3 is incorporated. A cage 4 is disposed between the inner ring 1 and the outer ring 2, and the ball 3 is held in a pocket 4 a of the cage 4.

この外輪2の軸方向一端側には、継手内部に充填したグリースの漏洩を防ぐと共に継手外部からの異物侵入を防止するためのエンドキャップ7がボルト締めにより固定され、軸方向他端側の外輪2とスタブシャフト5との間には密封装置が装着されている。   An end cap 7 for preventing leakage of grease filled in the joint and preventing entry of foreign matter from the outside of the joint is fixed to one end side in the axial direction of the outer ring 2 by bolting, and the outer ring on the other end side in the axial direction is fixed. A sealing device is mounted between 2 and the stub shaft 5.

この密封装置はブーツ8と金属製のブーツアダプタ9とからなる。ブーツ8は、ゴム材料又は樹脂材料等の可撓性材料にて構成され、大径端部8a、小径端部8b、および大径端部8aと小径端部8bとを連結する断面Vの字状の中間部8cを有する。ブーツアダプタ9は円筒形で、一端に外輪2の外周面と嵌合するフランジ9aを有し、エンドキャップ7と共にボルト締めにより外輪2に固定される。ブーツ8の小径端部8bはスタブシャフト5に取り付けてブーツバンド10で締め付けられている。ブーツ8の大径端部8aはブーツアダプタ9の端部9bを加締めて保持されている。   This sealing device comprises a boot 8 and a metal boot adapter 9. The boot 8 is made of a flexible material such as a rubber material or a resin material, and has a large-diameter end portion 8a, a small-diameter end portion 8b, and a cross-sectional V shape that connects the large-diameter end portion 8a and the small-diameter end portion 8b. The intermediate portion 8c has a shape. The boot adapter 9 has a cylindrical shape, has a flange 9 a fitted to the outer peripheral surface of the outer ring 2 at one end, and is fixed to the outer ring 2 by bolting together with the end cap 7. A small-diameter end portion 8 b of the boot 8 is attached to the stub shaft 5 and fastened with a boot band 10. The large-diameter end portion 8 a of the boot 8 is held by crimping the end portion 9 b of the boot adapter 9.

スタブシャフト5の外周面には環状凹部5bが形成され、この環状凹部5bにブーツ8の小径端部8bが外嵌され、ブーツバンド10で締め付けられている。小径端部8bは肉厚の円筒部からなり、自由状態でその内径が環状凹部5bの外径よりもわずかに小さく設定されており、これによって、環状凹部5bに対する嵌着性を担保している。また、小径端部8bの外周面には周方向溝8dが形成され、この周方向溝8dにブーツバンド10が嵌合している。   An annular recess 5 b is formed on the outer peripheral surface of the stub shaft 5, and a small-diameter end portion 8 b of the boot 8 is fitted on the annular recess 5 b and is fastened by a boot band 10. The small-diameter end portion 8b is formed of a thick cylindrical portion, and the inner diameter thereof is set to be slightly smaller than the outer diameter of the annular recess 5b in a free state, thereby ensuring the fit to the annular recess 5b. . Further, a circumferential groove 8d is formed on the outer peripheral surface of the small diameter end portion 8b, and the boot band 10 is fitted in the circumferential groove 8d.

ブーツ8の小径端部8bの内径面には、熱や高速回転時の内圧膨張によるブーツ8の破裂、変形および減圧時の凹みを防止するため、内外圧を均衡させる通気孔11が設けられている。この通気孔11は、図5に示すようにブーツ8の小径端部8bの内周面に通気溝12を軸方向に設けることにより、その通気溝12とスタブシャフト5の外周面とで構成され、継手の内外を連通させている(例えば、特許文献1,2参照)。
実開平5−42837号公報 実開平7−44969号公報
The inner diameter surface of the small-diameter end portion 8b of the boot 8 is provided with a vent hole 11 that balances the internal and external pressures in order to prevent rupture, deformation, and dent at the time of decompression of the boot 8 due to heat or internal pressure expansion during high-speed rotation. Yes. As shown in FIG. 5, the vent hole 11 is formed by the vent groove 12 and the outer peripheral surface of the stub shaft 5 by providing the vent groove 12 in the axial direction on the inner peripheral surface of the small-diameter end portion 8 b of the boot 8. The inside and outside of the joint are communicated (for example, see Patent Documents 1 and 2).
Japanese Utility Model Publication No. 5-42837 Japanese Utility Model Publication No. 7-44969

ところで、特許文献1に開示されたブーツでは、小径端部内周にシャフトのブーツ溝に締め代をもって嵌合される環状突出部が形成され、その環状突出部の内径面に軸方向に延びる通気溝が設けられている。また、特許文献2に開示されたブーツでは、小径端部の円筒形外面の中心を円筒形内面の中心に対して偏心させ、その偏心された小径端部の厚肉部の内面に軸方向に延びる通気溝が形成されている。   By the way, in the boot disclosed in Patent Document 1, an annular protrusion is formed on the inner periphery of the small-diameter end portion to be fitted to the boot groove of the shaft with a tightening margin, and the ventilation groove extends in the axial direction on the inner diameter surface of the annular protrusion. Is provided. In the boot disclosed in Patent Document 2, the center of the cylindrical outer surface of the small-diameter end is eccentric with respect to the center of the cylindrical inner surface, and the eccentric inner surface of the thick-walled portion of the small-diameter end is axially directed. An extending ventilation groove is formed.

しかしながら、図5に示すように、継手の回転時および回転停止時を通じて、常時、ブーツ8の小径端部8bに形成された通気溝12とシャフト5の外周面とで構成される通気孔11が継手の内外で連通していることから、その通気孔11を介して継手内部からグリースが漏れたり、あるいは継手外部から水が侵入したりする問題があった。   However, as shown in FIG. 5, the ventilation hole 11 constituted by the ventilation groove 12 formed in the small-diameter end portion 8 b of the boot 8 and the outer peripheral surface of the shaft 5 is always provided during the rotation and stoppage of the joint. Since the joint is communicated inside and outside, there is a problem that grease leaks from the inside of the joint through the vent hole 11 or water enters from the outside of the joint.

特に、継手の回転時については、その回転の遠心力により継手内部のグリースがブーツ8のベロー部8cの内周面に押し付けられるため、グリース漏れを抑制することが可能であるが、継手の回転停止時には、前述した回転の遠心力が作用しないため、継手内部からのグリース漏れが顕著となる。   In particular, when the joint is rotated, grease inside the joint is pressed against the inner peripheral surface of the bellows portion 8c of the boot 8 by the centrifugal force of the rotation, so that grease leakage can be suppressed. At the time of stopping, the centrifugal force of the rotation described above does not act, so that grease leakage from the inside of the joint becomes significant.

そこで、本発明は前述の問題点に鑑みて提案されたもので、その目的とするところは、ブーツに設けられた通気孔を通じて、継手内部からグリースが漏れたり、継手内部へ水が侵入したりすることを未然に防止し得る等速自在継手を提供することにある。   Therefore, the present invention has been proposed in view of the above-described problems, and the object of the present invention is that grease leaks from the inside of the joint or water enters the inside of the joint through the vent hole provided in the boot. An object of the present invention is to provide a constant velocity universal joint that can prevent this from occurring.

前述の目的を達成するための技術的手段として、本発明の等速自在継手は、円筒状内周面に軸方向に延びる複数の直線状トラック溝を形成した外方部材と、その外方部材のトラック溝と対向する複数の直線状トラック溝を凸球状外周面に形成すると共に内径孔にシャフトの一端が連結された内方部材と、外方部材のトラック溝と内方部材のトラック溝間に介在してトルクを伝達する複数のボールと、外方部材と内方部材間に介在してボールを保持するケージと、大径端部が外方部材の外周面に嵌着されると共に小径端部がシャフトの外周面に嵌着されることにより継手内部を密封する可撓性のブーツとを備え、ブーツの小径端部の内方部材側近傍に、その内径面と外径面間で貫通する通気孔を形成すると共に、その通気孔の内径面側をシャフトの外周面に接合させることにより閉塞させ、継手回転によるブーツの径方向外側への膨張でもって通気孔の内径面側を開口可能としたことを特徴とする。   As technical means for achieving the above-described object, the constant velocity universal joint of the present invention includes an outer member in which a plurality of linear track grooves extending in the axial direction are formed on a cylindrical inner peripheral surface, and the outer member. An inner member in which a plurality of linear track grooves facing the track grooves are formed on the convex spherical outer peripheral surface and one end of the shaft is connected to the inner diameter hole, and between the track grooves of the outer member and the track grooves of the inner member A plurality of balls that transmit torque by being interposed between them, a cage that holds the balls by being interposed between the outer member and the inner member, and a large-diameter end that is fitted to the outer peripheral surface of the outer member and has a small diameter A flexible boot that seals the inside of the joint by fitting the end portion to the outer peripheral surface of the shaft, and between the inner diameter surface and the outer diameter surface in the vicinity of the inner member side of the small diameter end portion of the boot. A through hole is formed and the inner diameter side of the vent is shuffled. Occluded by bonding to the outer peripheral surface of, characterized in that the openable inner diameter side of the vent hole with the expansion radially outward of the boot by joint rotation.

本発明では、ブーツの小径端部の内方部材側近傍に形成された通気孔の内径面側をシャフトの外周面に接合させることにより閉塞させる。これにより、継手の回転停止時には、通気孔の内径面側が閉塞されていることから、継手内部からのグリースの漏れや継手内部への水の侵入を抑止することができる。なお、これは継手の回転スピードが遅い場合についても同様である。   In the present invention, the inner diameter surface side of the air hole formed in the vicinity of the inner member side of the small diameter end portion of the boot is closed by joining to the outer peripheral surface of the shaft. Thereby, when the rotation of the joint is stopped, the inner diameter side of the vent hole is closed, so that leakage of grease from the inside of the joint and water intrusion into the joint can be suppressed. The same applies to the case where the rotation speed of the joint is slow.

一方、継手の回転時には、その回転の遠心力により可撓性のブーツが径方向外側へ膨張するため、継手の回転停止時に閉塞していた通気孔の内径面側を開口させることができ、これにより通気性を確保し、熱や高速回転時の内圧膨張によるブーツの破裂、変形、減圧時の凹みを防止する。この時、継手内部のグリースは、回転の遠心力によりブーツの内周面へ押し付けられるため、通気孔を介して継手外部へ漏れることはない。   On the other hand, when the joint rotates, the flexible boot expands radially outward due to the centrifugal force of the rotation, so that the inner surface of the vent hole that was blocked when the joint stopped rotating can be opened. This ensures air permeability and prevents rupture, deformation, and dents during decompression due to heat and internal pressure expansion during high-speed rotation. At this time, since the grease inside the joint is pressed against the inner peripheral surface of the boot by the centrifugal force of rotation, it does not leak to the outside of the joint through the vent hole.

本発明によれば、ブーツの小径端部の内方部材側近傍に形成された通気孔の内径面側をシャフトの外周面に接合させることにより閉塞させることにより、継手の回転停止時、継手内部からのグリースの漏れや継手内部への水の侵入を抑止することができる。   According to the present invention, when the rotation of the joint is stopped, the inside of the joint is stopped by closing the inner diameter side of the vent formed in the vicinity of the inner member side of the small-diameter end of the boot with the outer peripheral surface of the shaft. Leakage of grease from water and intrusion of water into the joint can be suppressed.

また、継手の回転時には、その回転の遠心力によりブーツが径方向外側へ膨張するため、継手の回転停止時に閉塞していた通気孔の内径面側を開口させることができることから、通気性の確保と共に継手内部からのグリースの漏れを抑止することができる。   In addition, when the joint is rotated, the boot expands radially outward due to the centrifugal force of the rotation, so that the inner diameter side of the vent hole that has been closed when the joint stops rotating can be opened, ensuring air permeability. At the same time, leakage of grease from the inside of the joint can be suppressed.

このように、通気孔を介して継手内部からグリースが漏れたり、継手内部へ水が侵入することを未然に防止でき、耐久性および信頼性に優れた等速自在継手を提供できる。   As described above, grease can be prevented from leaking from the inside of the joint through the vent or water from entering the inside of the joint, and a constant velocity universal joint excellent in durability and reliability can be provided.

図1は本発明の実施形態で、レブロ型等速自在継手(LJ)に適用した場合を例示する。なお、本発明はこのレブロ型等速自在継手に限らず、例えば、ダブルオフセット型等速自在継手(DOJ)などの摺動式等速自在継手や他の固定式等速自在継手を含む、プロペラシャフトに使用される等速自在継手に適用可能である。   FIG. 1 shows an embodiment of the present invention, which is applied to a Lebro type constant velocity universal joint (LJ). The present invention is not limited to this Lebro type constant velocity universal joint, and includes, for example, a sliding type constant velocity universal joint such as a double offset type constant velocity universal joint (DOJ) and other fixed type constant velocity universal joints. Applicable to constant velocity universal joints used for shafts.

このレブロ型等速自在継手は、内方部材としての内輪21、外方部材としての外輪22、複数のボール23およびケージ24を主要な部品として構成されている。   The Lebro type constant velocity universal joint includes an inner ring 21 as an inner member, an outer ring 22 as an outer member, a plurality of balls 23 and a cage 24 as main components.

内輪21は、その外周面に複数のトラック溝21aが形成されている。この内輪21の中心孔の内径にスプライン21bを形成すると共にスタブシャフト25の軸部25aの外径にスプライン25bを形成することにより、その内輪21の中心孔にスタブシャフト25の軸部25aを挿入してスプライン嵌合により連結して両者間でのトルク伝達を可能にしている。このスタブシャフト25の軸部25aの先端には輪溝25cが設けられ、この輪溝25cに装着されたスナップリング26を内輪21の端面にて係止させることにより、スタブシャフト25は内輪21に対して抜け止めされている。   The inner ring 21 has a plurality of track grooves 21a formed on the outer peripheral surface thereof. The spline 21b is formed on the inner diameter of the center hole of the inner ring 21 and the spline 25b is formed on the outer diameter of the shaft part 25a of the stub shaft 25, whereby the shaft part 25a of the stub shaft 25 is inserted into the center hole of the inner ring 21. And it connects by spline fitting and enables torque transmission between both. A ring groove 25 c is provided at the tip of the shaft portion 25 a of the stub shaft 25, and the stub shaft 25 is attached to the inner ring 21 by locking the snap ring 26 attached to the ring groove 25 c at the end surface of the inner ring 21. On the other hand, it is secured.

外輪22は、内輪21の外周に配置され、その内周面に内輪21のトラック溝21aと同数のトラック溝22aが形成されている。内輪21のトラック溝21aと外輪22のトラック溝22aは、軸線に対して反対方向に傾斜した角度をなし、対をなす内輪21のトラック溝21aと外輪22のトラック溝22aとの交叉部にボール23が組み込みまれる。内輪21の外周面と外輪22の内周面との間にケージ24が配置され、ボール23はケージ24のポケット24a内で転動自在に保持される。   The outer ring 22 is disposed on the outer periphery of the inner ring 21, and the same number of track grooves 22a as the track grooves 21a of the inner ring 21 are formed on the inner peripheral surface thereof. The track groove 21a of the inner ring 21 and the track groove 22a of the outer ring 22 form an angle inclined in the opposite direction with respect to the axis, and a ball is formed at the intersection of the track groove 21a of the inner ring 21 and the track groove 22a of the outer ring 22 that make a pair. 23 is incorporated. A cage 24 is disposed between the outer peripheral surface of the inner ring 21 and the inner peripheral surface of the outer ring 22, and the balls 23 are held in a pocket 24a of the cage 24 so as to roll freely.

この外輪22の軸方向一端側には、継手内部に充填したグリースの漏洩を防ぐと共に継手外部からの異物侵入を防止するためのエンドキャップ27がボルト締めにより固定され、軸方向他端側の外輪22とスタブシャフト25との間には密封装置が装着されている。   An end cap 27 for preventing leakage of grease filled in the joint and preventing entry of foreign matter from the outside of the joint is fixed to one end side of the outer ring 22 in the axial direction by bolting. A sealing device is mounted between 22 and the stub shaft 25.

この密封装置は可撓性のブーツ28と金属製のブーツアダプタ29とからなる。ブーツ28は、大径端部28a、小径端部28b、および大径端部28aと小径端部28bとを連結する断面Vの字状の中間部28cを有する。ブーツアダプタ29は円筒形で、一端に外輪22の外周面と嵌合するフランジ29aを有し、エンドキャップ27と共にボルト締めにより外輪22に固定される。ブーツ28の小径端部28bはスタブシャフト25に取り付けてブーツバンド30で締め付けられている。ブーツ28の大径端部28aはブーツアダプタ29の端部29bを加締めて保持されている。   This sealing device comprises a flexible boot 28 and a metal boot adapter 29. The boot 28 has a large-diameter end portion 28a, a small-diameter end portion 28b, and an intermediate portion 28c having a V-shaped cross section connecting the large-diameter end portion 28a and the small-diameter end portion 28b. The boot adapter 29 is cylindrical, has a flange 29a fitted to the outer peripheral surface of the outer ring 22 at one end, and is fixed to the outer ring 22 by bolting together with the end cap 27. A small-diameter end portion 28 b of the boot 28 is attached to the stub shaft 25 and fastened with a boot band 30. The large-diameter end portion 28 a of the boot 28 is held by crimping the end portion 29 b of the boot adapter 29.

ブーツ28は、ゴム材料又は樹脂材料等の可撓性材料にて構成され、例えば、エステル系、オレフィン系、ウレタン系、アミド系、スチレン系等の熱可塑性エラストマー、あるいは熱可塑性エラストマーよりも圧縮永久歪み量が小さいCR、NBR、シリコンあるいはフッ素ゴム、クロロプレン等のゴム材料が好適である。前述した熱可塑性エラストマーは、ブーツ28の素材として、疲労性や摩耗性などの耐久性、耐熱老化性、耐油性、高速回転性(回転時振れ廻り性)に優れ、安定した機能を発揮する。   The boot 28 is made of a flexible material such as a rubber material or a resin material. For example, the boot 28 is a thermoplastic elastomer such as an ester, olefin, urethane, amide, or styrene, or is more permanently compressed than a thermoplastic elastomer. A rubber material such as CR, NBR, silicon, fluorine rubber, or chloroprene having a small strain is suitable. The above-mentioned thermoplastic elastomer is excellent in durability, such as fatigue and wear, heat aging resistance, oil resistance, and high-speed rotation (running performance during rotation) as a material of the boot 28, and exhibits a stable function.

スタブシャフト25の外周面には環状凹部25bが形成され、この環状凹部25bにブーツ28の小径端部28bが外嵌され、ブーツバンド30で締め付けられている。小径端部28bは肉厚の円筒部からなり、自由状態でその内径が環状凹部25bの外径よりもわずかに小さく設定されており、これによって、環状凹部25bに対する嵌着性を担保している。また、小径端部28bの外周面には周方向溝28dが形成され、この周方向溝28dにブーツバンド30が嵌合している。   An annular recess 25 b is formed on the outer peripheral surface of the stub shaft 25, and the small-diameter end portion 28 b of the boot 28 is fitted on the annular recess 25 b and fastened by the boot band 30. The small-diameter end portion 28b is made of a thick cylindrical portion, and its inner diameter is set to be slightly smaller than the outer diameter of the annular recess 25b in a free state, thereby ensuring the fit to the annular recess 25b. . Further, a circumferential groove 28d is formed on the outer peripheral surface of the small diameter end portion 28b, and the boot band 30 is fitted in the circumferential groove 28d.

ブーツ28の小径端部28bの内輪側近傍28bには、熱や高速回転時の内圧膨張によるブーツ28の破裂、変形および減圧時の凹みを防止するため、内外圧を均衡させる通気孔41が設けられている。この通気孔41は、図2に示すようにブーツ28の小径端部28bの内輪側近傍28bに、その内径面と外径面間で貫通するように形成されている。ここで、ブーツ28の小径端部28bの内輪側近傍28bとは、その小径端部28bとベロー部28cとの間、つまり小径端部28bから延びるベロー部28cの基部で、小径端部28bと近接する部位を意味する。 The inner ring side near 28b 1 of the small diameter end portion 28b of the boot 28, rupture of the boot 28 due to internal pressure expansion at the time of heat or high-speed rotation, to prevent dents during deformation and vacuum vents 41 to balance the inner external pressure Is provided. The vent holes 41, the inner ring side near 28b 1 of the small diameter end portion 28b of the boot 28 as shown in FIG. 2, are formed so as to penetrate between the inner surface and the outer diameter surface. Here, the inner ring side near 28b 1 of the small diameter end portion 28b of the boot 28, between the small diameter end portion 28b and a bellows portion 28c, that is at the base of the bellows portion 28c extending from the small diameter end portion 28b, small diameter end portion 28b And a close part.

この実施形態では、通気孔41の内径面側41aをスタブシャフト25の外周面に接合させることにより閉塞させ、継手回転によるブーツ28の径方向外側への膨張でもって通気孔41の内径面側41aを開口可能としている。図2は継手の回転停止時でのブーツ28の状態を示し、図3は継手の回転時でのブーツ28の状態を示す。   In this embodiment, the inner diameter side 41a of the vent hole 41 is closed by joining to the outer peripheral face of the stub shaft 25, and the inner diameter side 41a of the vent hole 41 is expanded by expansion of the boot 28 radially outward due to joint rotation. Can be opened. FIG. 2 shows the state of the boot 28 when the joint stops rotating, and FIG. 3 shows the state of the boot 28 when the joint rotates.

つまり、図2に示すようにブーツ28の小径端部28bの内輪側近傍28bに形成された通気孔41の内径面側41aをスタブシャフト25の外周面に接合させることにより閉塞させる。このように、継手の回転停止時には、通気孔41の内径面側41aがスタブシャフト25の外周面(環状凹部25bの内輪側端部)に密着して閉塞されていることから、継手内部からのグリースの漏れや継手内部への水の侵入を抑止することができる。なお、これは継手の回転スピードが遅い場合についても同様である。 That is, as shown in FIG. 2, the inner diameter surface side 41 a of the vent hole 41 formed in the inner ring side vicinity 28 b 1 of the small diameter end portion 28 b of the boot 28 is closed by joining to the outer peripheral surface of the stub shaft 25. As described above, when the rotation of the joint is stopped, the inner diameter side 41a of the vent hole 41 is in close contact with the outer peripheral surface of the stub shaft 25 (the inner ring side end of the annular recess 25b). Grease leakage and water intrusion into the joint can be suppressed. The same applies to the case where the rotation speed of the joint is slow.

一方、継手の回転時には、図3に示すようにその回転の遠心力により可撓性のブーツ28のベロー部28cが径方向外側(図中白抜き矢印方向)へ膨張するため、継手の回転停止時に閉塞していた通気孔41の内径面側41aを回転の遠心力による変形(浮き上がり)でもって開口させることができる。つまり、通気孔41の内径面側41aとスタブシャフト25の外周面との間に隙間mが形成される。これにより通気性を確保し、熱や高速回転時の内圧膨張によるブーツ28の破裂、変形、減圧時の凹みを防止する。この時、継手内部のグリースは、回転の遠心力によりブーツ28のベロー部28cの内周面へ押し付けられるため、通気孔41を介して継手外部へ漏れることはない。   On the other hand, when the joint rotates, the bellows 28c of the flexible boot 28 expands radially outward (in the direction of the white arrow in the figure) due to the centrifugal force of the rotation as shown in FIG. The inner surface 41a of the vent hole 41 that is sometimes closed can be opened by deformation (raising) due to the centrifugal force of rotation. That is, a gap m is formed between the inner diameter surface side 41 a of the vent hole 41 and the outer peripheral surface of the stub shaft 25. This ensures air permeability and prevents the boot 28 from being ruptured, deformed, or dented during decompression due to heat or internal pressure expansion during high-speed rotation. At this time, the grease inside the joint is pressed against the inner peripheral surface of the bellows portion 28c of the boot 28 by the centrifugal force of rotation, and therefore does not leak to the outside of the joint via the vent hole 41.

このように、ブーツ28の小径端部28bの内輪側近傍28bに形成された通気孔41の内径面側41aをスタブシャフト25の外周面に接合させて閉塞させることにより、継手の回転停止時、継手内部からのグリースの漏れや継手内部への水の侵入を抑止することができる。また、継手の回転時には、その回転の遠心力により、継手の回転停止時に閉塞していた通気孔41の内径面側41aを開口させることができることから、通気性の確保と共に継手内部からのグリースの漏れを抑止することができる。 In this way, by closed by joining the inner surface side 41a of the vent hole 41 formed in the inner side near 28b 1 of the small diameter end portion 28b of the boot 28 to the outer peripheral surface of the stub shaft 25, during the rotation stop of the joint In addition, leakage of grease from the inside of the joint and water intrusion into the joint can be suppressed. Further, when the joint is rotated, the centrifugal force of the rotation can open the inner surface 41a of the vent hole 41 that has been closed when the joint is stopped. Leakage can be suppressed.

このように、通気孔41を介して継手内部からグリースが漏れたり、継手内部へ水が侵入することを未然に防止できることから、等速自在継手における耐久性および信頼性の向上が図れる。   As described above, grease can be prevented from leaking from the inside of the joint through the vent hole 41 and water from entering the inside of the joint, so that the durability and reliability of the constant velocity universal joint can be improved.

本発明は前述した実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得ることは勿論のことであり、本発明の範囲は、特許請求の範囲によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内のすべての変更を含む。   The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

本発明の実施形態で、レブロ型等速自在継手の全体構成を示す断面図である。It is sectional drawing which shows the whole structure of a Lebro type constant velocity universal joint in embodiment of this invention. 図1の等速自在継手の回転停止時におけるブーツの状態を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the state of the boot at the time of rotation stop of the constant velocity universal joint of FIG. 図1の等速自在継手の回転時におけるブーツの状態を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the state of the boot at the time of rotation of the constant velocity universal joint of FIG. 等速自在継手の従来例で、レブロ型等速自在継手を示す断面図である。It is sectional drawing which shows a Lebro type constant velocity universal joint in the prior art example of a constant velocity universal joint. 図4の等速自在継手の要部拡大断面図である。It is a principal part expanded sectional view of the constant velocity universal joint of FIG.

符号の説明Explanation of symbols

21 内方部材(内輪)
21a トラック溝
22 外方部材(外輪)
22a トラック溝
23 ボール
24 ケージ
25 シャフト
28 ブーツ
28a 大径端部
28b 小径端部
28b 内方部材側近傍(内輪側近傍)
41 通気孔
41a 内径面側
21 Inner member (inner ring)
21a Track groove 22 Outer member (outer ring)
22a Track groove 23 Ball 24 Cage 25 Shaft 28 Boot 28a Large diameter end portion 28b Small diameter end portion 28b 1 Inward member side vicinity (Inner ring side vicinity)
41 Vent 41a Inner diameter side

Claims (1)

円筒状内周面に軸方向に延びる複数の直線状トラック溝を形成した外方部材と、その外方部材のトラック溝と対向する複数の直線状トラック溝を凸球状外周面に形成すると共に内径孔にシャフトの一端が連結された内方部材と、外方部材のトラック溝と内方部材のトラック溝間に介在してトルクを伝達する複数のボールと、外方部材と内方部材間に介在して前記ボールを保持するケージと、大径端部が前記外方部材の外周面に嵌着されると共に小径端部が前記シャフトの外周面に嵌着されることにより継手内部を密封する可撓性のブーツとを備えた等速自在継手であって、
前記ブーツの小径端部の内方部材側近傍に、その内径面と外径面間で貫通する通気孔を形成すると共に、その通気孔の内径面側をシャフトの外周面に接合させることにより閉塞させ、継手回転によるブーツの径方向外側への膨張でもって前記通気孔の内径面側を開口可能としたことを特徴とする等速自在継手。
An outer member formed with a plurality of linear track grooves extending in the axial direction on the cylindrical inner peripheral surface, and a plurality of linear track grooves opposed to the track grooves of the outer member are formed on the convex spherical outer peripheral surface and the inner diameter An inner member having one end of the shaft connected to the hole, a plurality of balls that are interposed between the track groove of the outer member and the track groove of the inner member, and transmit torque, and between the outer member and the inner member A cage for interposing and holding the ball, and a large-diameter end portion are fitted on the outer peripheral surface of the outer member, and a small-diameter end portion is fitted on the outer peripheral surface of the shaft, thereby sealing the inside of the joint. A constant velocity universal joint comprising a flexible boot,
A vent hole penetrating between the inner diameter surface and the outer diameter surface is formed in the vicinity of the inner member side of the small-diameter end of the boot, and the inner diameter surface side of the vent hole is closed by joining to the outer peripheral surface of the shaft. A constant velocity universal joint characterized in that the inner diameter surface side of the vent hole can be opened by expansion of the boot radially outward by rotation of the joint.
JP2006074867A 2006-03-17 2006-03-17 Constant velocity universal joint Withdrawn JP2007247845A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8834279B2 (en) 2012-03-14 2014-09-16 Dana Automotive Systems Group, Llc Shaft assembly for a constant velocity joint

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8834279B2 (en) 2012-03-14 2014-09-16 Dana Automotive Systems Group, Llc Shaft assembly for a constant velocity joint

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