JP2007225025A

JP2007225025A - Fitting structure between inner joint member and shaft of constant velocity universal joint

Info

Publication number: JP2007225025A
Application number: JP2006046930A
Authority: JP
Inventors: Minoru Ishijima; 実石島; Junichi Izumino; 純一五十公野
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2006-02-23
Filing date: 2006-02-23
Publication date: 2007-09-06

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure easy to compact without lowering its strength. <P>SOLUTION: The structure comprises a tripod member 20 mounted on a constant velocity universal joint which transmits torque while allowing angle displacement between an outer ring 10 and itself, and a shaft 60 spline-fitted to the tripod member 20 in a non slip fashion. The tripod member 20 is formed of induction hardened steel integrally with a shank 23 extending from a boss part 21 of the tripod member 20 to the axial direction, and the shaft 60 is spline-fitted to the front end of the shank 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、自動車や各種産業機械の動力伝達系において使用され、例えば４ＷＤ車やＦＲ車などで使用されるドライブシャフトやプロペラシャフトに組み込まれる固定式あるいは摺動式等速自在継手の内側継手部材とシャフトの嵌合構造に関する。 The present invention is used in power transmission systems of automobiles and various industrial machines. For example, an inner joint member of a fixed or sliding constant velocity universal joint incorporated in a drive shaft or propeller shaft used in a 4WD vehicle, an FR vehicle, or the like. And the shaft fitting structure.

例えば、自動車のドライブシャフト等の連結用継手として使用されている摺動式等速自在継手（トリポード型等速自在継手：ＴＪ）は、内周面に三本のトラック溝が軸方向に形成され、各トラック溝の両側にそれぞれ軸方向のローラ案内面を有する外側継手部材としての外輪と、半径方向に突出した三本の脚軸を有する内側継手部材としてのトリポード部材と、そのトリポード部材の脚軸と外輪のローラ案内面との間に回転自在に収容された転動部材としてのローラとを主要な部材として構成される。 For example, a sliding type constant velocity universal joint (tripod type constant velocity universal joint: TJ) used as a coupling joint for automobile drive shafts, etc. has three track grooves formed in the axial direction on the inner peripheral surface. An outer ring as an outer joint member having axial roller guide surfaces on both sides of each track groove, a tripod member as an inner joint member having three leg shafts projecting in the radial direction, and legs of the tripod member A roller as a rolling member that is rotatably accommodated between the shaft and the roller guide surface of the outer ring is configured as a main member.

ドライブシャフトは、中間のシャフトの一方の軸端に摺動式等速自在継手を装着し、シャフトの他方の軸端に固定式等速自在継手を装着した構造を具備する。この摺動式等速自在継手をドライブシャフトに使用する場合、前述したシャフトの一方の軸端にトリポード部材を連結するようにしている。 The drive shaft has a structure in which a sliding constant velocity universal joint is attached to one shaft end of an intermediate shaft and a fixed constant velocity universal joint is attached to the other shaft end of the shaft. When this sliding type constant velocity universal joint is used for a drive shaft, a tripod member is connected to one end of the shaft described above.

このトリポード部材とシャフトとの連結構造は、トリポード部材の軸孔内径面に雌スプラインを形成すると共に、シャフトの軸端外径面に雄スプラインを形成し、シャフトの軸端をトリポード部材の軸孔に圧入して雄スプラインと雌スプラインを噛み合わせることにより、シャフトをトリポード部材に嵌合させている。このシャフトとトリポード部材のスプライン嵌合により両者間でトルクを伝達可能としている（例えば、特許文献１の図２参照）。
特開２００３−３１４５８０号公報 The connection structure of the tripod member and the shaft is such that a female spline is formed on the inner diameter surface of the tripod member and a male spline is formed on the outer diameter surface of the shaft end, and the shaft end of the shaft is connected to the shaft hole of the tripod member. The shaft is fitted into the tripod member by press-fitting into and engaging the male spline and the female spline. Torque can be transmitted between the shaft and the tripod member by spline fitting (see, for example, FIG. 2 of Patent Document 1).
JP 2003-314580 A

ところで、前述した等速自在継手において、トリポード部材のシャフトとの嵌合部は、軸孔が形成されている中空円筒状をなすことから肉厚が薄くなっている。一方、トリポード部材は、一般的に浸炭焼入れ鋼で製作されており、その硬化層深さが浅い。そこで、トリポード部材の強度を確保するためには、シャフトとの嵌合部の肉厚を大きくする必要がある。しかしながら、シャフトとの嵌合部の肉厚を大きくすると、トリポード部材が大きくなり、等速自在継手全体の大型化を招くことになる。 By the way, in the constant velocity universal joint mentioned above, since the fitting part with the shaft of a tripod member makes hollow cylinder shape in which the shaft hole is formed, thickness is thin. On the other hand, the tripod member is generally made of carburized and hardened steel, and its hardened layer depth is shallow. Therefore, in order to ensure the strength of the tripod member, it is necessary to increase the thickness of the fitting portion with the shaft. However, when the thickness of the fitting portion with the shaft is increased, the tripod member is increased, and the overall constant velocity universal joint is increased in size.

また、ドライブシャフトの軽量化や剛性アップを目的とした場合、中空状のシャフトを使用することが好ましい。しかしながら、この場合、トリポード部材の軸孔内径面の雌スプラインとシャフトの軸端外径面の雄スプラインとの嵌合であることから、その嵌合部分でシャフトの軸端内径が中空状となるため、シャフトの強度が低下するという問題もあった。 Moreover, when aiming at weight reduction and rigidity improvement of a drive shaft, it is preferable to use a hollow shaft. However, in this case, since the female spline on the inner diameter surface of the shaft hole of the tripod member and the male spline on the outer diameter surface of the shaft end are fitted, the shaft end inner diameter of the shaft becomes hollow at the fitting portion. Therefore, there is a problem that the strength of the shaft is lowered.

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、強度を低下させることなく、コンパクト化を実現容易にし得る等速自在継手の内側継手部材とシャフトの嵌合構造を提供することにある。 Therefore, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to provide an inner joint member and a shaft of a constant velocity universal joint that can easily be made compact without reducing strength. The object is to provide a fitting structure.

前述の目的を達成するための技術的手段として、本発明は、外側継手部材との間で角度変位を許容しながらトルクを伝達する等速自在継手に装備された内側継手部材とその内側継手部材にスプライン嵌合して抜け止めされたシャフトとを備え、内側継手部材とその内側継手部材から軸方向に延びる軸部とを一体成形し、その軸部の先端にシャフトをスプライン嵌合させたことを特徴とする。 As technical means for achieving the above-described object, the present invention provides an inner joint member provided in a constant velocity universal joint that transmits torque while allowing angular displacement with the outer joint member, and the inner joint member. The inner joint member and the shaft portion extending in the axial direction from the inner joint member are integrally formed, and the shaft is spline-fitted to the tip of the shaft portion. It is characterized by.

本発明では、内側継手部材とその内側継手部材から軸方向に延びる軸部とを一体成形し、その軸部の先端にシャフトをスプライン嵌合させたことにより、内側継手部材に軸孔を形成する必要がないことから、その内側継手部材の肉厚を大きくできて充分な強度を確保することができると共に、内側継手部材の外径が大きくならないことから、継手のコンパクト化が図れる。 In the present invention, the inner joint member and the shaft portion extending in the axial direction from the inner joint member are integrally formed, and the shaft is spline fitted to the tip of the shaft portion, thereby forming the shaft hole in the inner joint member. Since it is not necessary, the thickness of the inner joint member can be increased and sufficient strength can be secured, and the outer diameter of the inner joint member does not increase, so that the joint can be made compact.

この等速自在継手の内側継手部材とシャフトの嵌合構造では、内側継手部材と軸部を高周波焼入れ鋼で一体成形し、その内側継手部材および軸部を高周波焼入れすることが望ましい。このようにすれば、内側継手部材および軸部の強度をより一層向上させることが可能となる。 In the fitting structure of the inner joint member of the constant velocity universal joint and the shaft, it is desirable that the inner joint member and the shaft portion are integrally formed of induction hardening steel, and the inner joint member and the shaft portion are induction hardened. In this way, it is possible to further improve the strength of the inner joint member and the shaft portion.

また、等速自在継手の内側継手部材とシャフトの嵌合構造において、内側継手部材から延びる軸部とシャフトとを止め輪あるいは加締めにより抜け止めすることが望ましい。このような抜け止め構造を採用すれば、内側継手部材の軸部とシャフトとの連結構造がより一層強固となる。さらに、加締めによる抜け止め構造の場合、止め輪が不要となり部品点数の削減も可能となる。 Further, in the fitting structure of the inner joint member of the constant velocity universal joint and the shaft, it is desirable to prevent the shaft portion extending from the inner joint member and the shaft from coming off by a retaining ring or caulking. If such a retaining structure is employed, the connection structure between the shaft portion of the inner joint member and the shaft is further strengthened. Further, in the case of a retaining structure by caulking, a retaining ring is not necessary, and the number of parts can be reduced.

さらに、等速自在継手の内側継手部材とシャフトの嵌合構造において、外側継手部材との間に装着されるブーツの小径側端部をシャフトの外径に締め付け固定することが望ましい。このようにすれば、等速自在継手の外側継手部材の外径にブーツの大径側端部を締め付け固定し、その等速自在継手の内側継手部材の嵌合相手であるシャフトの外径にブーツの小径側端部を締め付け固定した構造とすることにより、ブーツの交換が容易となる。 Furthermore, in the fitting structure of the inner joint member of the constant velocity universal joint and the shaft, it is desirable that the small-diameter end of the boot mounted between the outer joint member is fastened and fixed to the outer diameter of the shaft. In this way, the large-diameter end of the boot is fastened and fixed to the outer diameter of the outer joint member of the constant velocity universal joint, and the outer diameter of the shaft that is the mating partner of the inner joint member of the constant velocity universal joint is fixed. By adopting a structure in which the small-diameter side end of the boot is fastened and fixed, the boot can be easily replaced.

本発明によれば、内側継手部材とその内側継手部材から軸方向に延びる軸部とを一体成形し、その軸部の先端にシャフトをスプライン嵌合させたことにより、内側継手部材に軸孔を形成する必要がないことから、その内側継手部材の肉厚を大きくできて充分な強度を確保することができると共に、内側継手部材の外径が大きくならないことから、継手のコンパクト化が図れる。その結果、充分な強度を確保した軽量コンパクトな等速自在継手を提供することができてその実用的価値は大きい。 According to the present invention, the inner joint member and the shaft portion extending in the axial direction from the inner joint member are integrally formed, and the shaft is spline-fitted to the tip of the shaft portion, whereby the shaft hole is formed in the inner joint member. Since it is not necessary to form the inner joint member, it is possible to increase the thickness of the inner joint member and ensure a sufficient strength. Further, since the outer diameter of the inner joint member does not increase, the joint can be made compact. As a result, a lightweight and compact constant velocity universal joint ensuring sufficient strength can be provided, and its practical value is great.

本発明の実施形態を以下に詳述する。なお、以下の実施形態は、摺動式（トリポード型）等速自在継手（ＴＪ）に適用した場合を例示するが、他の摺動式等速自在継手、例えば、クロスグルーブ型等速自在継手（ＬＪ）やダブルオフセット型等速自在継手（ＤＯＪ）に適用可能であり、さらに、固定式等速自在継手、例えばツェパー型等速自在継手（ＢＪ）やアンダーカットフリー型等速自在継手（ＵＪ）にも適用可能である。 Embodiments of the present invention are described in detail below. In addition, although the following embodiment illustrates the case where it applies to a sliding type (tripod type) constant velocity universal joint (TJ), other sliding type constant velocity universal joints, for example, a cross groove type constant velocity universal joint, are illustrated. (LJ) and double offset type constant velocity universal joints (DOJ). Furthermore, fixed type constant velocity universal joints such as Zepper type constant velocity universal joints (BJ) and undercut free type constant velocity universal joints (UJ). ) Is also applicable.

図１および図２に示す実施形態のトリポード型等速自在継手は、外側継手部材としての外輪１０と、内側継手部材としてのトリポード部材２０と、その外輪１０とトリポード部材２０の間に回転自在に介在する転動部材としてのローラ３０とを主要な部材として構成されている。 The tripod constant velocity universal joint of the embodiment shown in FIGS. 1 and 2 is rotatable between an outer ring 10 as an outer joint member, a tripod member 20 as an inner joint member, and between the outer ring 10 and the tripod member 20. A roller 30 as an intervening rolling member is configured as a main member.

外輪１０は、一端が開口し、他端が閉塞した略円筒カップ状をなし、内周面に軸方向の三本のトラック溝１１が中心軸の周りに１２０°間隔で形成されている。各トラック溝１１は、その円周方向で向かい合った側壁にそれぞれ凹曲面状のローラ案内面１２が軸方向に形成されている。トリポード部材２０は、ボス部２１と、そのボス部の外周に半径方向に向けて放射状に突出した三本の脚軸２２と、ボス部２１から軸方向に延在させた軸部２３とからなる。ローラ３０は、複数の針状ころ４０（図１参照）を介して脚軸２２に回転自在に装着され、トリポート部材２０の脚軸２２と外輪１０のローラ案内面１２との間に収容されている。 The outer ring 10 has a substantially cylindrical cup shape with one end opened and the other end closed, and three track grooves 11 in the axial direction are formed on the inner peripheral surface at intervals of 120 ° around the central axis. Each track groove 11 is formed with a concave curved roller guide surface 12 in the axial direction on the side walls facing each other in the circumferential direction. The tripod member 20 includes a boss portion 21, three leg shafts 22 that protrude radially in the radial direction on the outer periphery of the boss portion, and a shaft portion 23 that extends from the boss portion 21 in the axial direction. . The roller 30 is rotatably mounted on the leg shaft 22 via a plurality of needle rollers 40 (see FIG. 1), and is accommodated between the leg shaft 22 of the tripod member 20 and the roller guide surface 12 of the outer ring 10. Yes.

なお、脚軸２２の外周面は針状ころ４０の内側軌道面とされ、ローラ３０の内周面は針状ころ４０の外側軌道面とされている。ローラ３０の外周面は、ローラ案内面１２に適合する凸球面とされている。針状ころ４０は、総ころ状態で組み込まれ、脚軸２２の先端部付近に装着されたサークリップ５０（図１参照）により抜け止めされている。 The outer peripheral surface of the leg shaft 22 is the inner raceway surface of the needle roller 40, and the inner peripheral surface of the roller 30 is the outer raceway surface of the needle roller 40. The outer peripheral surface of the roller 30 is a convex spherical surface that fits the roller guide surface 12. The needle roller 40 is assembled in a full roller state, and is prevented from coming off by a circlip 50 (see FIG. 1) mounted near the tip of the leg shaft 22.

この等速自在継手では、トリポード部材２０の脚軸２２と外輪１０のローラ案内面１２とがローラ３０を介して二軸の回転方向に係合することにより、駆動側から従動側へ回転トルクが等速で伝達される。また、各ローラ３０が脚軸２２に対して回転しながらローラ案内面１２上を転動することにより、外輪１０とトリポード部材２０との間の相対的な軸方向変位や角度変位が吸収される。 In this constant velocity universal joint, the leg shaft 22 of the tripod member 20 and the roller guide surface 12 of the outer ring 10 are engaged with each other in the rotational direction of the two shafts via the roller 30 so that rotational torque is generated from the driving side to the driven side. It is transmitted at a constant speed. Further, as each roller 30 rolls on the roller guide surface 12 while rotating with respect to the leg shaft 22, relative axial displacement and angular displacement between the outer ring 10 and the tripod member 20 are absorbed. .

ドライブシャフトは、中間のシャフト６０の一方の軸端にこの摺動式等速自在継手を装着し、シャフト６０の他方の軸端に固定式等速自在継手（図示せず）を装着した構造を具備する。この摺動式等速自在継手をドライブシャフトに使用する場合、前述したシャフト６０の一方の軸端６１にトリポード部材２０の軸部２３を連結する。このトリポード部材２０の軸部２３とシャフト６０の軸端６１をスプライン嵌合で連結することにより両者間でトルク伝達が可能となる。 The drive shaft has a structure in which this sliding constant velocity universal joint is mounted on one shaft end of the intermediate shaft 60 and a fixed constant velocity universal joint (not shown) is mounted on the other shaft end of the shaft 60. It has. When this sliding type constant velocity universal joint is used for a drive shaft, the shaft portion 23 of the tripod member 20 is connected to one shaft end 61 of the shaft 60 described above. By connecting the shaft portion 23 of the tripod member 20 and the shaft end 61 of the shaft 60 by spline fitting, torque can be transmitted between them.

また、継手内部に封入されたグリースが外部へ漏洩したり、あるいは、外部から継手内部へ水やダスト等の異物が侵入したりすることを防止する目的から、外輪１０とトリポード部材２０の軸部２３との間に蛇腹状のゴムあるいは樹脂製ブーツ７０を装着している。 In addition, for the purpose of preventing the grease enclosed in the joint from leaking to the outside, or preventing foreign matter such as water and dust from entering the joint from the outside, the shaft portion of the outer ring 10 and the tripod member 20 is used. 23, a bellows-like rubber or resin boot 70 is attached.

つまり、ブーツ７０の大径側端部７１を外輪１０の開口部外周面に形成された取付溝１３に嵌め込んでブーツバンド８０により締め付け固定し、ブーツ７０の小径側端部７２を軸部２３の先端近傍に形成された取付溝２４に嵌め込んでブーツバンド８１により締め付け固定するようにしている。 That is, the large-diameter side end portion 71 of the boot 70 is fitted into the mounting groove 13 formed on the outer peripheral surface of the opening of the outer ring 10 and is fastened and fixed by the boot band 80, and the small-diameter side end portion 72 of the boot 70 is fixed to the shaft portion 23. Is fitted into a mounting groove 24 formed in the vicinity of the tip of the belt and is fastened and fixed by a boot band 81.

図１はトリポード部材２０とシャフト６０を連結する前の状態、図３はトリポード部材２０とシャフト６０を連結した後の状態をそれぞれ示す。このトリポード部材２０とシャフト６０の嵌合構造では、トリポード部材２０とそのトリポード部材２０のボス部２１から軸方向に延びる軸部２３を一体成形し、その軸部２３の先端にシャフト６０の軸端６１をスプライン嵌合させている。 FIG. 1 shows a state before the tripod member 20 and the shaft 60 are connected, and FIG. 3 shows a state after the tripod member 20 and the shaft 60 are connected. In the fitting structure of the tripod member 20 and the shaft 60, the tripod member 20 and the shaft portion 23 extending in the axial direction from the boss portion 21 of the tripod member 20 are integrally formed, and the shaft end of the shaft 60 is formed at the tip of the shaft portion 23. 61 is spline-fitted.

この実施形態では、トリポード部材２０と軸部２３を高周波焼入れ鋼で一体成形し、そのトリポード部材２０および軸部２３を高周波焼入れする。この高周波焼入れによる表面硬化処理でもってトリポード部材２０のボス部２１、脚軸２２および軸部２３の強度を向上させることができる。 In this embodiment, the tripod member 20 and the shaft portion 23 are integrally formed with induction hardening steel, and the tripod member 20 and the shaft portion 23 are induction hardened. The strength of the boss portion 21, the leg shaft 22, and the shaft portion 23 of the tripod member 20 can be improved by this surface hardening treatment by induction hardening.

また、トリポード部材２０に軸孔を形成する必要がないことから、そのトリポード部材２０の肉厚を大きくできて充分な強度を確保することができると共に、トリポード部材２０の外径が大きくならないことから、継手のコンパクト化が図れる。 Moreover, since it is not necessary to form a shaft hole in the tripod member 20, the thickness of the tripod member 20 can be increased to ensure sufficient strength, and the outer diameter of the tripod member 20 does not increase. The joint can be made compact.

この軸部２３の先端に大径部２５を設け、その大径部２５の外周面に雄スプライン２６を形成する。この軸部２３の大径部２５の先端には、止め輪用凹溝２７が形成されている。また、大径部２５のスプライン根元部は、継手方向に向けて漸次縮径するようなテーパ面２８が形成されている。 A large diameter portion 25 is provided at the tip of the shaft portion 23, and a male spline 26 is formed on the outer peripheral surface of the large diameter portion 25. A retaining ring concave groove 27 is formed at the tip of the large-diameter portion 25 of the shaft portion 23. In addition, the spline root portion of the large diameter portion 25 is formed with a tapered surface 28 that gradually decreases in diameter toward the joint direction.

一方、シャフト６０は中空状をなし、その軸端６１の内径に雌スプライン６２が形成されている。この軸端６１の内径のスプライン開口部には、軸部２３の大径部２５が挿入し易いように、開口端に向けて拡径するテーパ面６３が形成されている。また、軸端６１の内径のスプライン最奥部は、スプライン最内径との段差でもって止め輪用係止部６４となっている。 On the other hand, the shaft 60 is hollow, and a female spline 62 is formed on the inner diameter of the shaft end 61 thereof. A tapered surface 63 is formed in the spline opening portion having an inner diameter of the shaft end 61 so that the large diameter portion 25 of the shaft portion 23 can be easily inserted. The innermost spline innermost part of the shaft end 61 forms a retaining ring locking part 64 with a step difference from the innermost spline inner diameter.

この実施形態のトリポード部材２０とシャフト６０の嵌合構造では、トリポード部材２０のボス部２１から軸方向に延びる軸部２３の先端の大径部２５をシャフト６０の内径に圧入し、その大径部２５の雄スプライン２６とシャフト６０の雌スプライン６２とを噛み合わせることにより、トリポード部材２０の軸部２３をシャフト６０の軸端６１に嵌合させている。このシャフト６０とトリポード部材２０のスプライン嵌合により両者間でトルク伝達が可能となる。 In the fitting structure of the tripod member 20 and the shaft 60 of this embodiment, the large diameter portion 25 at the tip of the shaft portion 23 extending in the axial direction from the boss portion 21 of the tripod member 20 is press-fitted into the inner diameter of the shaft 60, The shaft portion 23 of the tripod member 20 is fitted to the shaft end 61 of the shaft 60 by meshing the male spline 26 of the portion 25 and the female spline 62 of the shaft 60. Torque can be transmitted between the shaft 60 and the tripod member 20 by spline fitting.

この軸部２３の大径部２５をシャフト６０の軸端６１に圧入するに際しては、大径部２５の凹溝２６に止め輪９０を装着する。この止め輪９０は、縮径可能な弾性部材からなり、例えばスナップリング等が好適である。その止め輪９０を縮径させた状態で大径部２５をシャフト６０の軸端６１の内径に圧入する。 When press-fitting the large-diameter portion 25 of the shaft portion 23 into the shaft end 61 of the shaft 60, the retaining ring 90 is attached to the concave groove 26 of the large-diameter portion 25. The retaining ring 90 is made of an elastic member that can be reduced in diameter. For example, a snap ring is preferable. The large-diameter portion 25 is press-fitted into the inner diameter of the shaft end 61 of the shaft 60 while the retaining ring 90 is reduced in diameter.

軸部２３の大径部２５を最奥部まで圧入すると、シャフト６０のスプライン最奥部に位置する係止部６４で止め輪９０が拡径して係止されることにより抜け止めされる。この場合、シャフト６０の軸端６１の内径にトリポード部材２０の軸部２３の大径部２５を圧入する構造となるため、そのスプライン嵌合部分での強度を確保することができる。 When the large-diameter portion 25 of the shaft portion 23 is press-fitted to the innermost portion, the retaining ring 90 is expanded and locked by the engaging portion 64 located at the innermost spline portion of the shaft 60 to be prevented from coming off. In this case, since the large diameter portion 25 of the shaft portion 23 of the tripod member 20 is press-fitted into the inner diameter of the shaft end 61 of the shaft 60, the strength at the spline fitting portion can be ensured.

従来では、シャフトの軸端外径をトリポード部材の軸孔内径にスプライン嵌合させた構造であることから、中空状シャフトの場合、強度を確保するにはシャフト内径を絞り込んでその軸端を厚肉化する必要があった。 Conventionally, the shaft end outer diameter of the shaft is spline-fitted to the inner diameter of the tripod member, so in the case of a hollow shaft, the shaft end is narrowed to ensure strength, and the shaft end is thickened. It was necessary to flesh.

これに対して、この実施形態の場合、シャフト６０の軸端６１の内径にトリポード部材２０の軸部２３の大径部２５を圧入する構造となることから、シャフトの軸端を厚肉化する必要がないので、シャフトの形状が単純となり、複雑な製造工程を必要とせずに高強度化が実現できる。 On the other hand, in this embodiment, since the large diameter portion 25 of the shaft portion 23 of the tripod member 20 is press-fitted into the inner diameter of the shaft end 61 of the shaft 60, the shaft end of the shaft is thickened. Since it is not necessary, the shape of the shaft becomes simple, and high strength can be realized without requiring a complicated manufacturing process.

以上の実施形態では、止め輪９０を利用したシャフト６０の抜け止め構造を説明したが、本発明はこれに限定されることなく、他の抜け止め構造であってもよい。図４および図５に示す実施形態では、止め輪９０を使用せず、加締めによる抜け止め構造を採用する。なお、図１〜図３に示す実施形態と同一又は相当部分には同一参照符号を付して重複説明は省略する。 In the above embodiment, the retaining structure of the shaft 60 using the retaining ring 90 has been described. However, the present invention is not limited to this, and other retaining structures may be used. In the embodiment shown in FIGS. 4 and 5, the retaining ring 90 is not used, but a retaining structure by caulking is employed. In addition, the same referential mark is attached | subjected to the same or equivalent part as embodiment shown in FIGS. 1-3, and duplication description is abbreviate | omitted.

図４および図５に示す実施形態では、前述の実施形態と異なり、止め輪９０を必要としないことから、トリポード部材２０の軸部２３の大径部２５に止め輪用凹溝２７（図１参照）が形成されていない。また、シャフト６０の軸端６１のスプライン開口部には、加締め部を厚肉して強度を確保するため、テーパ面６３（図１参照）が形成されていない。 In the embodiment shown in FIGS. 4 and 5, unlike the above-described embodiment, the retaining ring 90 is not required. Reference) is not formed. Further, the spline opening portion of the shaft end 61 of the shaft 60 is not formed with a tapered surface 63 (see FIG. 1) in order to secure the strength by thickening the caulking portion.

トリポード部材２０の軸部２３の大径部２５をシャフト６０の軸端６１内に圧入し、その最奥部まで圧入した上でシャフト６０の軸端６１の開口部を内方へ加締める。この加締め部６５は、大径部２５の継手側に設けられたテーパ面２８に沿わせるようにしてシャフト６０の軸端６１の開口部を塑性変形させることにより形成される。 The large-diameter portion 25 of the shaft portion 23 of the tripod member 20 is press-fitted into the shaft end 61 of the shaft 60, and the opening of the shaft end 61 of the shaft 60 is crimped inward after being pressed into the innermost portion. The caulking portion 65 is formed by plastically deforming the opening portion of the shaft end 61 of the shaft 60 so as to be along the tapered surface 28 provided on the joint side of the large diameter portion 25.

この加締め部６５によりシャフト６０をトリポード部材２０の軸部２３から抜け止めすることができる。なお、加締め部６５の形成は、軸端６１の開口部一部あるいは全周のいずれであってもよい。この加締め部６５による抜け止めの場合、前述した実施形態と比較して止め輪９０のような別部品が不要となることから、部品点数の削減が図れて製品コストを低減することができる。 The crimping portion 65 can prevent the shaft 60 from coming off from the shaft portion 23 of the tripod member 20. The caulking portion 65 may be formed on a part of the opening of the shaft end 61 or on the entire circumference. In the case of retaining by the caulking portion 65, a separate part such as the retaining ring 90 is not required as compared with the above-described embodiment, so that the number of parts can be reduced and the product cost can be reduced.

図６は前述した図４に示す実施形態での等速自在継手の外輪１０とシャフト６０間にブーツ７０を装着した状態を示す。この実施形態では、蛇腹状のゴムあるいは樹脂製ブーツ７０の大径側端部７１を外輪１０のブーツ取付溝１３に嵌合させてブーツバンド８０で締め付け固定し、その小径側端部７２をシャフト６０のブーツ取付溝６６に嵌合させてブーツバンド８２で締め付け固定する。このように、等速自在継手のトリポード部材２０の嵌合相手であるシャフト６０にブーツ７０の小径側端部７２を締め付け固定することで、ブーツ７０の交換が容易となる。 FIG. 6 shows a state in which a boot 70 is mounted between the outer ring 10 and the shaft 60 of the constant velocity universal joint in the embodiment shown in FIG. In this embodiment, the large-diameter end 71 of the bellows-like rubber or resin boot 70 is fitted into the boot mounting groove 13 of the outer ring 10 and fastened and fixed by the boot band 80, and the small-diameter end 72 is connected to the shaft. 60 boot fitting grooves 66 are fitted and fastened with a boot band 82. In this manner, the boot 70 can be easily replaced by tightening and fixing the small-diameter side end 72 of the boot 70 to the shaft 60 to which the tripod member 20 of the constant velocity universal joint is fitted.

なお、以上の各実施形態では、ドライブシャフトに適用した場合について説明したが、本発明はこれに限定されることなく、プロペラシャフトにも適用可能である。 In each of the above embodiments, the case where the present invention is applied to a drive shaft has been described. However, the present invention is not limited to this, and can be applied to a propeller shaft.

本発明の実施形態で、等速自在継手のトリポード部材とシャフトの嵌合前の状態を示す縦断面図である。In embodiment of this invention, it is a longitudinal cross-sectional view which shows the state before the fitting of the tripod member of a constant velocity universal joint, and a shaft. 図１の等速自在継手を示す横断面図である。It is a cross-sectional view which shows the constant velocity universal joint of FIG. 図１の等速自在継手のトリポード部材とシャフトを嵌合させて止め輪で抜け止めした状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which fitted the tripod member and shaft of the constant velocity universal joint of FIG. 1, and stopped | fastened with the retaining ring. 本発明の他の実施形態で、等速自在継手のトリポード部材とシャフトの嵌合前の状態を示す縦断面図である。In other embodiment of this invention, it is a longitudinal cross-sectional view which shows the state before the fitting of the tripod member of a constant velocity universal joint, and a shaft. 図４の等速自在継手のトリポード部材とシャフトを嵌合させて加締めにより抜け止めした状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which fitted the tripod member and shaft of the constant velocity universal joint of FIG. 図５の等速自在継手のブーツ取付構造を変更した状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which changed the boot mounting structure of the constant velocity universal joint of FIG.

符号の説明Explanation of symbols

１０外側継手部材（外輪）
２０内側継手部材（トリポード部材）
２３軸部
２６雄スプライン
６０シャフト
６２雌スプライン
６５加締め部
７０ブーツ
７２小径側端部
９０止め輪 10 Outer joint member (outer ring)
20 Inner joint member (tripod member)
23 Shaft portion 26 Male spline 60 Shaft 62 Female spline 65 Clamping portion 70 Boot 72 Small diameter side end 90 Retaining ring

Claims

外側継手部材との間で角度変位を許容しながらトルクを伝達する等速自在継手に装備された内側継手部材とその内側継手部材にスプライン嵌合して抜け止めされたシャフトとを備え、前記内側継手部材とその内側継手部材から軸方向に延びる軸部とを一体成形し、その軸部の先端に前記シャフトをスプライン嵌合させたことを特徴とする等速自在継手の内側継手部材とシャフトの嵌合構造。 An inner joint member provided in a constant velocity universal joint that transmits torque while allowing angular displacement with the outer joint member, and a shaft that is spline fitted to the inner joint member to prevent the inner joint member from coming off, A joint member and a shaft portion extending in the axial direction from the inner joint member are integrally formed, and the shaft is spline-fitted to the tip of the shaft portion. Mating structure.

前記内側継手部材と軸部を高周波焼入れ鋼で一体成形し、その内側継手部材および軸部を高周波焼入れした請求項１に記載の等速自在継手の内側継手部材とシャフトの嵌合構造。 The inner joint member and shaft fitting structure of the constant velocity universal joint according to claim 1, wherein the inner joint member and the shaft portion are integrally formed of induction hardening steel, and the inner joint member and the shaft portion are induction hardened.

前記内側継手部材から延びる軸部とシャフトとを止め輪にて抜け止めした請求項１又は２に記載の等速自在継手の内側継手部材とシャフトの嵌合構造。 The fitting structure between the inner joint member of the constant velocity universal joint and the shaft according to claim 1, wherein a shaft portion extending from the inner joint member and the shaft are prevented from being detached by a retaining ring.

前記内側継手部材から延びる軸部とシャフトとを加締めにより抜け止めした請求項１又は２に記載の等速自在継手の内側継手部材とシャフトの嵌合構造。 The fitting structure between the inner joint member of the constant velocity universal joint and the shaft according to claim 1, wherein the shaft portion extending from the inner joint member and the shaft are prevented from coming off by caulking.

前記外側継手部材との間に装着されるブーツの小径側端部をシャフトの外径に締め付け固定した請求項１〜４のいずれか一項に記載の等速自在継手の内側継手部材とシャフトの嵌合構造。 The inner joint member of the constant velocity universal joint according to any one of claims 1 to 4, wherein a small-diameter side end portion of a boot mounted between the outer joint member and the shaft is fixed to the outer diameter of the shaft. Mating structure.