JP4794867B2 - Constant velocity universal joint with boots - Google Patents

Constant velocity universal joint with boots Download PDF

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JP4794867B2
JP4794867B2 JP2005042495A JP2005042495A JP4794867B2 JP 4794867 B2 JP4794867 B2 JP 4794867B2 JP 2005042495 A JP2005042495 A JP 2005042495A JP 2005042495 A JP2005042495 A JP 2005042495A JP 4794867 B2 JP4794867 B2 JP 4794867B2
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boot
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joint member
outer joint
protrusion
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JP2006226453A (en
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真一 高部
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NTN Corp
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Priority to PCT/JP2005/022763 priority patent/WO2006085418A1/en
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Priority to EP05814222A priority patent/EP1850024B1/en
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この発明は、自動車や各種産業機械等の動力伝達系で使用されるブーツ付き等速自在継手に関する。   The present invention relates to a constant velocity universal joint with a boot used in a power transmission system of an automobile or various industrial machines.

等速自在継手は、内部に封入したグリースの外部への漏れ防止や、等速自在継手内部への異物侵入を防止する目的でブーツを装着する。このブーツは、一般に、等速自在継手の外側継手部材の端部に設けたブーツ取付部に装着される大径取付部と、等速自在継手に連結されたシャフトに設けたブーツ取付部に装着される小径取付部と、両取付部を一体に連結する屈曲部とで構成される。等速自在継手用ブーツとしては、クロロプレンなどのゴムで成形されたものや、熱可塑性エラストマーで成形されたものなどが広く用いられている。   The constant velocity universal joint is equipped with a boot for the purpose of preventing leakage of grease enclosed inside to the outside and preventing foreign matter from entering the constant velocity universal joint. This boot is generally mounted on the large-diameter mounting portion that is mounted on the boot mounting portion provided at the end of the outer joint member of the constant velocity universal joint, and on the boot mounting portion that is provided on the shaft connected to the constant velocity universal joint. A small-diameter mounting portion and a bent portion that integrally connects both mounting portions. As a boot for a constant velocity universal joint, a boot molded with rubber such as chloroprene, a boot molded with a thermoplastic elastomer, and the like are widely used.

一方、等速自在継手には、θ=45〜50deg程度の大きな作動角を取ることのできる固定式(ツェッパ型、バーフィールド型)、作動角はそれ程大きく取ることはできないが外側継手部材の軸線方向にスライドする機構を兼ね備えた摺動式(ダブルオフセット型、トリポード型、クロスグルーブ型)等がある。外側継手部材の形状は、その開口部の輪郭形状が円筒状のものもあれば、非円筒状のものもある。等速自在継手の軽量化や加工性等の観点から、内部構造を考慮した非円筒形状を適用する方が効率的である場合が多数存在する。そのような非円筒形状の外側継手部材に適用されるブーツには、主にクロロプレンラバー製が使用されてきた。   On the other hand, the constant velocity universal joint is a fixed type (Zepper type, Barfield type) that can take a large operating angle of θ = 45 to 50 deg. The operating angle cannot be so large, but the axis of the outer joint member There are sliding types (double offset type, tripod type, cross groove type) that have a mechanism that slides in the direction. As for the shape of the outer joint member, the contour shape of the opening part may be a cylindrical shape or the non-cylindrical shape may be used. There are many cases where it is more efficient to apply the non-cylindrical shape considering the internal structure from the viewpoint of weight reduction and workability of the constant velocity universal joint. Chloroprene rubber has been mainly used for boots applied to such non-cylindrical outer joint members.

昨今では熱可塑性エラストマー製ブーツの適用も検討されている(特開平10−110738号公報、特開平10−196673号公報、特開2002−13546号公報、特開2003−194093号公報、特開2003−329057号公報)。
特開平10−110738号公報 特開平10−196673号公報 特開2002−13546号公報 特開2003−194093号公報 特開2003−329057号公報
In recent years, the application of thermoplastic elastomer boots has also been studied (Japanese Patent Laid-Open Nos. 10-110738, 10-196673, 2002-13546, 2003-194093, 2003). -329057).
Japanese Patent Laid-Open No. 10-110738 Japanese Patent Laid-Open No. 10-196673 JP 2002-13546 A JP 2003-194093 A JP 2003-329057 A

クロロプレンラバー製ブーツは、等速自在継手用ブーツとして比較的良好な性能を持っているが、耐疲労性、耐摩耗性、耐低温性、耐熱老化性、耐グリース性(耐油性)などの面で、使用条件によっては十分とは言えない場合も発生するため、より優れた性能を持つ熱可塑性エラストマー製ブーツに置き換わる傾向にある。   Chloroprene rubber boots have relatively good performance as boots for constant velocity universal joints, but have aspects such as fatigue resistance, wear resistance, low temperature resistance, heat aging resistance, and grease resistance (oil resistance). However, since it may not be sufficient depending on the use conditions, it tends to be replaced with a thermoplastic elastomer boot having better performance.

しかし、その輪郭形状が非円筒形状を成す外側継手部材を用いた等速自在継手には、クロロプレンラバー製ブーツが主に使用されている。これは、熱可塑性エラストマー製ブーツは大径取付部を非円筒形状に成形することや複雑な形状に成形することが困難なためである。あるいは、熱可塑性エラストマーは材料特性上、弾性特性にやや乏しく材料硬さも高いため、外側継手部材へのブーツ装着性に難があったり、シール性が不十分となる場合があったりする。   However, a boot made of chloroprene rubber is mainly used for a constant velocity universal joint using an outer joint member whose contour shape forms a non-cylindrical shape. This is because it is difficult for a thermoplastic elastomer boot to form a large-diameter mounting portion into a non-cylindrical shape or a complicated shape. Alternatively, since the thermoplastic elastomer is somewhat poor in elastic properties and high in material hardness in terms of material characteristics, there are cases where the boot mounting property to the outer joint member is difficult, and the sealing performance may be insufficient.

熱可塑性エラストマー製ブーツを非円筒形状の外側継手部材に適用する際には、非円筒形状の外側継手部材と円筒形状のブーツの大径取付部との間、または、非円筒形状の外側継手部材に対してブーツの大径取付部を外側継手部材の外周に沿う形状に成形し、その非円筒形状のブーツの大径取付部外面とバンドとの間に弾性部材(ブッシングと称す)を介在させるタイプを使用することが考えられる。しかし、この形態では部品点数が多くなり、管理上および組立て工程上好ましくない。しかも、コストが上がってしまう。あるいは、ブッシングにある程度の厚みが必要なため外径寸法が大きくなる。さらには、外輪/ブーツ間、ブーツ/ブッシング間それぞれの接触部におけるシール性も不十分である。   When the thermoplastic elastomer boot is applied to the non-cylindrical outer joint member, the non-cylindrical outer joint member is provided between the non-cylindrical outer joint member and the large-diameter mounting portion of the cylindrical boot, or the non-cylindrical outer joint member. In contrast, the large-diameter mounting portion of the boot is formed into a shape along the outer periphery of the outer joint member, and an elastic member (referred to as a bushing) is interposed between the outer surface of the large-diameter mounting portion of the non-cylindrical boot and the band. It is conceivable to use a type. However, this configuration increases the number of parts, which is not preferable for management and assembly processes. Moreover, the cost increases. Or since a certain amount of thickness is required for a bushing, an outer diameter dimension becomes large. Furthermore, the sealability at the contact portion between the outer ring / boot and between the boot / bushing is insufficient.

一方、ブーツの大径取付部をほぼ一定肉厚にて非円筒形状の外側継手部材に沿った形状に成形し、そのブーツ外面をその非円筒形状に沿った形状をしたバンドで締めることも考えられるが、バンドが複雑な形状となるためコストが上がり、シール性も不十分である。   On the other hand, it is also considered that the large-diameter mounting portion of the boot is formed with a substantially constant thickness along the non-cylindrical outer joint member, and the boot outer surface is tightened with a band shaped along the non-cylindrical shape. However, since the band has a complicated shape, the cost increases and the sealing performance is insufficient.

本発明のブーツ付き等速自在継手は、第一の回転軸と第二の回転軸を連結する等速自在継手であって、第一の回転軸とトルク伝達可能に結合する外側継手部材と、第二の回転軸とトルク伝達可能に結合する内側継手部材と、外側継手部材と内側継手部材との間に介在してトルクを伝達するトルク伝達部材と、外側継手部材と第二の回転軸との間に装着して継手内部に充填したグリースの漏洩および外部からの異物の侵入を防止するための熱可塑性エラストマー製ブーツとを具備した等速自在継手において、
外側継手部材のブーツ取付部の外周面は、横断面で見ると、大径部と小径部が交互に現れる非円筒形状であって、縦断面で見ると、大径部は、ブーツ溝と、外側継手部材の端面側に位置し前記ブーツ溝よりも大径の突出部とを有し、突出部は、端面から漸次拡径した第一の斜面と、端面から遠ざかるにつれて漸次縮径した第二の斜面とを有し、小径部は直線状であり、
ブーツは、外側継手部材のブーツ取付部と嵌合する大径取付部と、第二の回転軸と嵌合する小径取付部と、大径取付部と小径取付部との間の屈曲部とからなり、大径取付部は、横断面で見ると、外周面が円形で、内周面が外側継手部材のブーツ取付部の外周面形状に沿う、薄肉部と厚肉部が交互に現れる形状であり、大径取付部のすべてが材料により充足され、縦断面で見ると、外周にブーツバンドを受け入れるためのバンド溝が形成してあり、内周は、薄肉部では端面から面取り部、軸線に平行な直線部、窪み、肩当てが連続して形成してあり、厚肉部では面取り部と軸線に平行な直線部が連続して形成してあり、
前記薄肉部の面取り部の端面側径は、前記第一の斜面の最小径よりも大きく、
前記窪みは、外側継手部材の前記突出部を受け入れるため、前記突出部の第一の斜面および第二の斜面と接する第三の斜面および第四の斜面を有し、
ブーツの大径取付部の内周面に全周にわたって突起が形成してあり、
前記突起および前記窪みを前記バンド溝の幅の範囲内に位置させたことを特徴とするものである。
The constant velocity universal joint with a boot of the present invention is a constant velocity universal joint that connects the first rotating shaft and the second rotating shaft, and an outer joint member that is coupled to the first rotating shaft so as to be able to transmit torque, An inner joint member coupled to the second rotating shaft so as to be able to transmit torque; a torque transmitting member for transmitting torque interposed between the outer joint member and the inner joint member; an outer joint member and a second rotating shaft; In a constant velocity universal joint equipped with a boot made of a thermoplastic elastomer for preventing leakage of grease filled inside the joint and preventing entry of foreign matter from outside,
The outer peripheral surface of the boot mounting portion of the outer joint member is a non-cylindrical shape in which a large diameter portion and a small diameter portion appear alternately when viewed in a cross section, and when viewed in a vertical cross section, the large diameter portion is a boot groove, The outer joint member is located on the end face side and has a protruding portion having a diameter larger than that of the boot groove. The protruding portion has a first slope gradually expanding from the end face and a second slope gradually reducing in diameter as the distance from the end face increases. And the small diameter portion is linear,
The boot includes a large-diameter attachment portion that fits into the boot attachment portion of the outer joint member, a small-diameter attachment portion that fits into the second rotating shaft, and a bent portion between the large-diameter attachment portion and the small-diameter attachment portion. The large-diameter mounting portion is a shape in which the outer peripheral surface is circular and the inner peripheral surface conforms to the outer peripheral surface shape of the boot mounting portion of the outer joint member, and the thin-walled portion and the thick-walled portion appear alternately when viewed in cross section. Yes, all of the large-diameter mounting parts are filled with material, and when viewed in a longitudinal section, a band groove for receiving the boot band is formed on the outer periphery, and the inner periphery is from the end face to the chamfered part and the axis in the thin part Parallel straight portions, depressions, shoulder pads are formed continuously, and in the thick wall portion, chamfered portions and straight portions parallel to the axis are formed continuously,
The end surface side diameter of the chamfered portion of the thin portion is larger than the minimum diameter of the first slope,
The recess has a third slope and a fourth slope contacting the first slope and the second slope of the protrusion to receive the protrusion of the outer joint member;
A protrusion is formed on the inner peripheral surface of the large-diameter mounting portion of the boot over the entire circumference.
The protrusion and the recess are positioned within the range of the width of the band groove.

本発明によれば、十分な耐久性と十分なシール性を両立して有し、かつ、部品点数を最小限に留め、組立て時の作業性をも向上し、コストも抑えることができる。すなわち、クロロプレンラバー製ブーツに比べて耐久性が向上し、十分なシール性も確保できるため、ブーツ性能の信頼性が向上する。また、部品点数を最少に留めることも達成でき、コストも抑えることができる。さらに、本発明によれば、外側継手部材に対するブーツの装着性および位置決め安定性、そしてブーツバンドのバンド溝への装着を容易にし、組立て時の作業性が向上する。   According to the present invention, sufficient durability and sufficient sealing performance can be achieved at the same time, the number of components can be minimized, workability during assembly can be improved, and cost can be reduced. That is, since durability is improved and sufficient sealing performance can be ensured as compared with a boot made of chloroprene rubber, reliability of boot performance is improved. In addition, the number of parts can be kept to a minimum, and the cost can be reduced. Furthermore, according to the present invention, the boot mounting and positioning stability with respect to the outer joint member, and the mounting of the boot band to the band groove are facilitated, and the workability during assembly is improved.

以下、熱可塑性エラストマー製ブーツを備えたトリポード型等速自在継手に適用した場合を例にとって実施の形態を説明する。   Hereinafter, an embodiment will be described by taking as an example a case where it is applied to a tripod type constant velocity universal joint provided with a boot made of a thermoplastic elastomer.

まず、図1および図2に示すように、トリポード型等速自在継手1は、外側継手部材2と、内側継手部材としてのトリポード部材4と、トルク伝達部材としてのローラ6を主要な構成要素としており、さらにブーツ10を具備している。   First, as shown in FIGS. 1 and 2, the tripod type constant velocity universal joint 1 includes an outer joint member 2, a tripod member 4 as an inner joint member, and a roller 6 as a torque transmission member as main components. In addition, a boot 10 is provided.

図示した実施の形態では、外側継手部材2は一体に形成されたマウス部22とステム部26とからなる。ステム部26は端部に形成したスプライン軸28にて第一の回転軸(図示せず)とトルク伝達可能に結合する。マウス部22は一端にて開口したカップ状で、内周の円周方向三等分位置に軸方向に延びるトラック溝24が形成してある。マウス部22の外周面は、横断面(図2)で見ると、大径部22aと小径部22bが交互に現れる非円筒形状である。この実施の形態の場合、大径部22aはトラック溝24に対応する凸円弧形状の部分で、小径部は隣り合うトラック溝24間の部分に対応する凹円弧形状の部分である。   In the illustrated embodiment, the outer joint member 2 includes a mouth portion 22 and a stem portion 26 that are integrally formed. The stem portion 26 is coupled to a first rotating shaft (not shown) by a spline shaft 28 formed at the end portion so that torque can be transmitted. The mouse portion 22 has a cup shape opened at one end, and a track groove 24 extending in the axial direction is formed at a position of the inner circumference in three equal parts. The outer peripheral surface of the mouse portion 22 has a non-cylindrical shape in which the large-diameter portions 22a and the small-diameter portions 22b appear alternately when viewed in cross section (FIG. 2). In this embodiment, the large-diameter portion 22 a is a convex arc-shaped portion corresponding to the track groove 24, and the small-diameter portion is a concave arc-shaped portion corresponding to a portion between the adjacent track grooves 24.

トリポード部材4はボス42と脚軸46とからなる。ボス42には第二の回転軸3とトルク伝達可能に結合するスプライン穴44が形成してある。脚軸46はボス42の円周方向三等分位置から半径方向に突出している。トリポード部材4の各脚軸46はローラ6を担持している。脚軸46とローラ6との間には複数の針状ころ8が介在させてあり、ローラ6は脚軸46の軸線を中心として回転自在である。なお、図1ではローラ6の脱落防止のための止め輪やワッシャ等を省略してある。また、ここでは、一つの脚軸46にローラ6を一つ装着する構造のものを例示してあるが、二つのローラを同時に具備する構造のものであってもよい。   The tripod member 4 includes a boss 42 and a leg shaft 46. The boss 42 is formed with a spline hole 44 that is coupled to the second rotary shaft 3 so that torque can be transmitted. The leg shaft 46 projects in the radial direction from the circumferentially divided position of the boss 42. Each leg shaft 46 of the tripod member 4 carries a roller 6. A plurality of needle rollers 8 are interposed between the leg shaft 46 and the roller 6, and the roller 6 is rotatable about the axis of the leg shaft 46. In FIG. 1, a retaining ring and a washer for preventing the roller 6 from falling off are omitted. Further, here, a structure in which one roller 6 is mounted on one leg shaft 46 is illustrated, but a structure having two rollers at the same time may be used.

図3にマウス部22の大径部22aの縦断面を示す。図示するように、端部近傍に円周方向に伸びるブーツ溝30が形成してある。このブーツ溝30付近を外側継手部材のブーツ取付部と呼ぶこととする。ブーツ溝30の底面は部分円筒面形状で、縦断面では軸線に平行な直線である。大径部22aの円周方向の一部または全部にわたって、突出部32が形成してある。突出部32は外側継手部材2の端面38付近に位置しているのが好ましい。   FIG. 3 shows a longitudinal section of the large diameter portion 22a of the mouse portion 22. As shown in FIG. As shown in the drawing, a boot groove 30 extending in the circumferential direction is formed in the vicinity of the end portion. The vicinity of the boot groove 30 is referred to as a boot mounting portion of the outer joint member. The bottom surface of the boot groove 30 has a partial cylindrical shape, and is a straight line parallel to the axis in the longitudinal section. A protruding portion 32 is formed over part or all of the circumferential direction of the large diameter portion 22a. The protrusion 32 is preferably located near the end surface 38 of the outer joint member 2.

図示した実施の形態の場合、突出部32の軸方向両側はいずれも斜面34,36である。これらの斜面34,36の軸線に対する傾斜角度は25°以上60°以下、好ましくは25°以上45°以下とする。これにより、外側継手部材2の旋削加工効率を良くすると同時にブーツ10の大径取付部12を外側継手部材2に嵌合させる際の装着性を向上させ、かつ、ブーツ装着後における外側継手部材2に対するブーツ10の抜け防止作用および位置安定性も向上させることができる。   In the case of the illustrated embodiment, both sides of the protrusion 32 in the axial direction are inclined surfaces 34 and 36. The inclination angles of the inclined surfaces 34 and 36 with respect to the axis are 25 ° or more and 60 ° or less, preferably 25 ° or more and 45 ° or less. Thereby, the turning efficiency of the outer joint member 2 is improved, and at the same time, the mounting property when the large-diameter mounting portion 12 of the boot 10 is fitted to the outer joint member 2 is improved, and the outer joint member 2 after the boot is mounted. It is also possible to improve the action of preventing the boot 10 from coming off and the position stability.

第一の斜面すなわち外側継手部材2の端面38とは反対側の斜面34の角度が60°よりも大きくなると、外側継手部材2のブーツ取付部の加工性が低下してしまう。一方、25°未満の場合、外側継手部材2に嵌合させた後のブーツ10の軸方向への抜け防止作用や位置安定性が低下してしまう。また、軸方向に長い突起となることで、外側継手部材2のブーツ取付部の全幅が大きくなってしまい、スペース効率や強度上好ましくない。第二の斜面すなわち外側継手部材2の端面38側の斜面36の角度が60°よりも大きくなるとブーツ装着性が阻害される。一方、25°未満の場合、突出部32が軸方向に長くなることでブーツ取付部の全幅が大きくなってしまい、スペース効率や強度上好ましくない。   If the angle of the first inclined surface, that is, the inclined surface 34 opposite to the end surface 38 of the outer joint member 2 is larger than 60 °, the workability of the boot mounting portion of the outer joint member 2 is deteriorated. On the other hand, when the angle is less than 25 °, the action of preventing the boot 10 from coming off in the axial direction after being fitted to the outer joint member 2 and the position stability are lowered. Moreover, since it becomes a protrusion long in an axial direction, the full width of the boot attachment part of the outer joint member 2 will become large, and it is unpreferable on space efficiency or intensity | strength. When the angle of the second inclined surface, that is, the inclined surface 36 on the end surface 38 side of the outer joint member 2 is larger than 60 °, the boot mounting property is hindered. On the other hand, when the angle is less than 25 °, the protrusion 32 is elongated in the axial direction, so that the entire width of the boot mounting portion is increased, which is not preferable in terms of space efficiency and strength.

ブーツ10は熱可塑性エラストマー製で、あらゆる部位が熱可塑性エラストマー材料により充足され、空隙は全く存在しない。特に取付部に空隙が存在すると、バンド13(図1参照)の締付力が外側継手部材2のブーツ取付部に十分伝わらず、シール性が損なわれる。採用し得る材料の例としては、JIS K 6253によるタイプDデュロメータ硬さが35以上50以下の熱可塑性ポリエステル系エラストマーを挙げることができる。なお、クロロプレン等のJIS K 6253によるタイプAデュロメータ硬さが50〜70で示されるゴム材であっても効果を示すが、JIS K 6253によるタイプDデュロメータ硬さが35〜50で示される熱可塑性ポリエステル系エラストマーなど、材料硬さが高い材料である場合、より効果を発揮できる。   The boot 10 is made of a thermoplastic elastomer, and every part is filled with the thermoplastic elastomer material, and there are no voids. In particular, if there is a gap in the attachment portion, the tightening force of the band 13 (see FIG. 1) is not sufficiently transmitted to the boot attachment portion of the outer joint member 2, and the sealing performance is impaired. Examples of materials that can be employed include thermoplastic polyester elastomers having a type D durometer hardness of 35 to 50 in accordance with JIS K 6253. A rubber material having a type A durometer hardness of 50 to 70 according to JIS K 6253, such as chloroprene, is effective, but a thermoplastic material having a type D durometer hardness of 35 to 50 according to JIS K 6253. In the case of a material having a high material hardness such as a polyester-based elastomer, the effect can be exhibited more.

図4に示すように、ブーツ10の全体概観は円すい台形状で、大径取付部12と小径取付部14と両者間の屈曲部16とからなる。図示した実施の形態では屈曲部16として蛇腹部が示してあるが、蛇腹タイプ以外のブーツにも適用することができる。大径取付部12を外側継手部材2に嵌合させ、小径取付部14を第二の回転軸3(図1)に嵌合させて、それぞれ、ブーツバンド13,15で締め付けて固定するようになっている。このため、各取付部の外周にブーツバンド13,15を受け入れるためのバンド溝18が形成してある。バンド溝18の底面は円筒面形状で縦断面が軸線に平行である。   As shown in FIG. 4, the overall appearance of the boot 10 has a truncated cone shape, and includes a large-diameter attachment portion 12, a small-diameter attachment portion 14, and a bent portion 16 therebetween. In the illustrated embodiment, a bellows portion is shown as the bent portion 16, but the present invention can also be applied to boots other than the bellows type. The large-diameter mounting portion 12 is fitted to the outer joint member 2, and the small-diameter mounting portion 14 is fitted to the second rotating shaft 3 (FIG. 1), and is fastened and fixed by the boot bands 13 and 15, respectively. It has become. For this reason, the band groove | channel 18 for receiving the boot bands 13 and 15 is formed in the outer periphery of each attaching part. The bottom surface of the band groove 18 has a cylindrical surface shape, and the longitudinal section is parallel to the axis.

外側継手部材2に対するブーツ10の装着性もさることながら、ブーツ10に対するバンド13,15の装着性も、等速自在継手を組み立てる上で考慮すべき重要な因子である。たとえば、バンド溝18の両側壁は全周に連続的に設けてもよいが、その場合バンドの装着性を低下させる場合がある。そこで、バンド溝18の両側壁のうち、特に図4の右端に現れている端面側の側壁を形成する突部19については、バンド13の装着性に問題がなく、しかもバンド13の位置が安定する設定として、次のような構成とするのが好ましい。すなわち、図5から分かるように、突部19を円周方向に断続的に、たとえば三等分位置に配置し、各突部19の高さを0.6mm以上1.2mm以下、軸方向寸法を0.6mm以上2.0mm以下、さらに円周方向寸法をブーツ軸心から10°以上25°以下の範囲とする。   In addition to the mountability of the boot 10 to the outer joint member 2, the mountability of the bands 13, 15 to the boot 10 is an important factor to be considered in assembling the constant velocity universal joint. For example, both side walls of the band groove 18 may be continuously provided on the entire circumference, but in that case, the band mounting property may be lowered. Therefore, among the side walls of the band groove 18, in particular, the protrusion 19 that forms the side wall on the end face side that appears at the right end in FIG. As the setting to be performed, the following configuration is preferable. That is, as can be seen from FIG. 5, the protrusions 19 are intermittently arranged in the circumferential direction, for example, at three equal positions, and the height of each protrusion 19 is 0.6 mm or more and 1.2 mm or less, and the axial dimension. Is 0.6 mm to 2.0 mm and the circumferential dimension is in the range of 10 ° to 25 ° from the boot axis.

ブーツ10の大径取付部の内周面は、図5に示すように、外側継手部材2のマウス部22の外周面形状に沿う形状となっている。すなわち、マウス部22の大径部22aに対応する薄肉部12aと、小径部22bに対応する厚肉部12bとが交互に現れる。   As shown in FIG. 5, the inner peripheral surface of the large-diameter mounting portion of the boot 10 has a shape that follows the outer peripheral surface shape of the mouth portion 22 of the outer joint member 2. That is, the thin part 12a corresponding to the large diameter part 22a of the mouse part 22 and the thick part 12b corresponding to the small diameter part 22b appear alternately.

大径取付部12の薄肉部12aの内周面は、縦断面で見ると、図6に示すように、端面側から面取り部A、軸線に平行な直線部B、窪みC、肩当てDが連続して形成してある。   As shown in FIG. 6, the inner peripheral surface of the thin portion 12a of the large-diameter mounting portion 12 includes a chamfered portion A from the end surface side, a straight portion B parallel to the axis, a recess C, and a shoulder pad D as shown in FIG. It is formed continuously.

面取り部Aは、軸線に対して20°以上60°以下の角度で端面から1mm以上設ける。このような面取り部Aを設けることにより、上述のブーツ装着性をさらに向上させることができる。面取り部Aの端面側径は、外側継手部材2の突出部32の端面側斜面36の最小径よりも大きく設定してある。外側継手部材2の突出部32の端面側斜面36と端面38との会合部分は丸みを付けて滑らかにつないである。これにより、ブーツ10を装着するとき、当該丸み部分によってブーツ10の面取り部Aが案内されるため、一層円滑にブーツ10の装着を行うことができる。   The chamfered portion A is provided at least 1 mm from the end surface at an angle of 20 ° to 60 ° with respect to the axis. By providing such a chamfered portion A, the above-described boot mounting property can be further improved. The end surface side diameter of the chamfered portion A is set larger than the minimum diameter of the end surface side inclined surface 36 of the protruding portion 32 of the outer joint member 2. The meeting part of the end surface side slope 36 and the end surface 38 of the protrusion 32 of the outer joint member 2 is rounded and smoothly connected. Thus, when the boot 10 is mounted, the chamfered portion A of the boot 10 is guided by the rounded portion, so that the boot 10 can be mounted more smoothly.

窪みCは、外側継手部材2の突出部32を受け入れるため、突出部32の斜面34,36と接する斜面C1,C2を有する。これらを第三の斜面C1、第四の斜面C2とすると、第三の斜面C1が突出部32の第一の斜面34に対応し、第四の斜面C2が突出部32の第二の斜面36に対応する。このような構成であるため、窪みCは外側継手部材2の突出部32と嵌合して軸方向への抜け防止作用を発生させる。 The recess C has slopes C 1 and C 2 that contact the slopes 34 and 36 of the protrusion 32 in order to receive the protrusion 32 of the outer joint member 2. Assuming that these are the third slope C 1 and the fourth slope C 2 , the third slope C 1 corresponds to the first slope 34 of the protrusion 32, and the fourth slope C 2 is the first slope of the protrusion 32. Corresponds to the second slope 36. Since it is such a structure, the hollow C fits with the protrusion part 32 of the outer joint member 2, and generates the removal | prevention action to an axial direction.

ブーツ10の大径取付部12は、外側継手部材2のブーツ取付部に容易に装着でき、かつ、バンド13で締め付けられた際に十分なシール性を発揮することが求められる。そのため、ブーツ10の大径取付部12の内面に設けた窪みCは、外側継手部材2の突出部32に沿う形状で、肩当てDは外側継手部材2の端面38と当接することで軸方向の位置決めをする。   The large-diameter attachment portion 12 of the boot 10 is required to be easily attached to the boot attachment portion of the outer joint member 2 and exhibit a sufficient sealing property when tightened with the band 13. Therefore, the recess C provided on the inner surface of the large-diameter mounting portion 12 of the boot 10 has a shape along the protruding portion 32 of the outer joint member 2, and the shoulder pad D comes into contact with the end surface 38 of the outer joint member 2 in the axial direction. Positioning.

ブーツ10の大径取付部12のうち厚肉部12bの内周面は、図7に示すように、端面側から、面取り部Aと軸線に平行な直線部Fが連続して形成してある。面取り部Aは既に述べた薄肉部のそれと同じである。   As shown in FIG. 7, the inner peripheral surface of the thick-walled portion 12b of the large-diameter mounting portion 12 of the boot 10 is continuously formed with a chamfered portion A and a linear portion F parallel to the axis from the end surface side. . The chamfered portion A is the same as that of the thin portion already described.

ブーツ10の大径取付部12の内周面に全周にわたって連続した突起Eが形成してある。この突起Eは薄肉部および厚肉部における上記直線部B,Fに位置する。突起Eの断面形状は半円や半楕円等でもよいが、三角形がより好ましい。図示する実施の形態では、突起Eの横断面は三角形で、頂点がブーツの半径方向内側つまり軸心側に向いている。突起Eは外側継手部材2のブーツ溝30と接触してシール機能を発揮する。突起Eは二条以上設けてもよい。あるいは、この突起Eとは別の不連続な突起を設けてもよい。バンド13で締め付けることにより、突起Eが外側継手部材2の非円筒形状からなるブーツ取付部のブーツ溝30に対して円周上均一に密着して十分なシール性を発揮する。その突起Eが密着する外側継手部材2のブーツ溝30の底面は平滑である。ブーツ溝30の底面は突起を設ける等の種々形状が考えられるが、外側継手部材2の加工工数の点から平滑であることが好ましい。   Protrusions E that are continuous over the entire circumference are formed on the inner circumferential surface of the large-diameter mounting portion 12 of the boot 10. This protrusion E is located in the said linear part B and F in a thin part and a thick part. The cross-sectional shape of the protrusion E may be a semicircle or a semi-ellipse, but a triangle is more preferable. In the illustrated embodiment, the protrusion E has a triangular cross section, and the apex is directed radially inward of the boot, that is, toward the axial center. The protrusion E contacts the boot groove 30 of the outer joint member 2 and exhibits a sealing function. Two or more protrusions E may be provided. Alternatively, a discontinuous protrusion different from the protrusion E may be provided. By tightening with the band 13, the protrusion E uniformly adheres to the boot groove 30 of the non-cylindrical boot mounting portion of the outer joint member 2 on the circumference and exhibits a sufficient sealing property. The bottom surface of the boot groove 30 of the outer joint member 2 with which the protrusion E is in close contact is smooth. The bottom surface of the boot groove 30 may have various shapes such as providing a protrusion, but is preferably smooth from the viewpoint of the processing man-hour of the outer joint member 2.

ブーツ10の大径取付部12における突起Eは、薄肉部12aと厚肉部12bの境界部においては凹円弧状に丸みをつけて滑らかにつないである。これにより、図10に示すように、外側継手部材2のブーツ溝30の円周方向端部の、異なる二曲面の接合部において、通常の締めしろの他の部位よりもブーツが外側継手部材に食い込むことが可能となってシール性が向上する。ただし、曲率半径が大きすぎると中央部が「担ぐ」ことになってすきまが生じてしまい、シール性が低下する。したがって、当該丸みの曲率半径は0.5mm以上5mm以下が好ましい。   The protrusion E in the large-diameter mounting portion 12 of the boot 10 is smoothly connected by rounding in a concave arc shape at the boundary between the thin portion 12a and the thick portion 12b. As a result, as shown in FIG. 10, the boot is connected to the outer joint member more than other portions of the normal tightening margin at the joint portion of the two different curved surfaces at the circumferential end portion of the boot groove 30 of the outer joint member 2. It becomes possible to bite in and the sealing performance is improved. However, if the radius of curvature is too large, the central portion is “bearing” and a gap is generated, resulting in a decrease in sealing performance. Therefore, the radius of curvature of the roundness is preferably 0.5 mm or more and 5 mm or less.

窪みCと突起Eの部位と外側継手部材2のブーツ取付部に対する締めしろは、突起Eの部位が弾性変形により外側継手部材2の突出部32を乗り越え、かつ、突起Eと外側継手部材2のブーツ溝30との間において十分なシール性を保つことができる設定が必要である。   The area of the recess C and the protrusion E and the tightening margin of the outer joint member 2 with respect to the boot mounting portion is such that the protrusion E part overcomes the protrusion 32 of the outer joint member 2 due to elastic deformation, and the protrusion E and the outer joint member 2 The setting which can maintain sufficient sealing performance between the boot grooves 30 is required.

ブーツ材質が熱可塑性エラストマー、特にJIS K 6253によるタイプDデュロメータ硬さが35以上50以下で示される熱可塑性ポリエステル系エラストマーである場合など、材料硬さが高い場合にはこの締めしろ設定が重要である。これに装着されるブーツ10の大径取付部12に窪みCの突出部32に対する締めしろが半径で0.1mm以上1.0mm以下であり、かつ、突起Eの先端のブーツ溝30に対する締めしろが半径で0.1mm以上1.5mm以下であることが好ましい。さらに、突起Eの高さは0.3mm以上1.0mm以下が好ましい。   When the material of the boot is high, such as when the material of the boot is a thermoplastic elastomer, especially a thermoplastic polyester elastomer with a type D durometer hardness of 35 or more and 50 or less according to JIS K 6253, this tightening setting is important. is there. The tightening margin for the protrusion 32 of the recess C in the large-diameter mounting portion 12 of the boot 10 attached thereto is 0.1 mm or more and 1.0 mm or less in radius, and the tightening margin for the boot groove 30 at the tip of the protrusion E Is preferably from 0.1 mm to 1.5 mm in radius. Furthermore, the height of the protrusion E is preferably 0.3 mm or greater and 1.0 mm or less.

述べたような締めしろ設定であれば、突起Eに外側継手部材2の突出部32を越えさせてブーツ10の大径取付部12を装着することができ、その後、バンド13で締め付けることによって、外側継手部材2のブーツ取付部にブーツ10の大径取付部12を強固に密着させて取り付けることができる。上述の締めしろよりも小さく設定した場合、バンド13を締めた時点でブーツ10が変形することにより局部的にすきまを生じる可能性がある。一方、上述の締めしろよりも大きい設定とすると、ブーツ装着が困難となる。また、突起Eの高さが0.3mm未満の場合、外側継手部材2の溝30に対する密着性が低くなり、十分なシール性が得られない。突起Eの高さが1.0mmを越える場合は、突起部の体積が大きくなりすぎて設計的にもシール性の面でも効率的でない。   With the tightening setting as described above, the large-diameter mounting portion 12 of the boot 10 can be attached to the protrusion E beyond the protruding portion 32 of the outer joint member 2, and then tightened with the band 13, The large-diameter attachment portion 12 of the boot 10 can be attached in close contact with the boot attachment portion of the outer joint member 2. If it is set to be smaller than the above-mentioned tightening margin, there is a possibility that a gap is locally generated by the deformation of the boot 10 when the band 13 is tightened. On the other hand, if the setting is larger than the above-described tightening margin, it is difficult to attach the boot. Moreover, when the height of the protrusion E is less than 0.3 mm, the adhesion of the outer joint member 2 to the groove 30 is lowered, and sufficient sealing performance cannot be obtained. When the height of the protrusion E exceeds 1.0 mm, the volume of the protrusion becomes too large, which is not efficient in terms of design and sealing properties.

ブーツ10の窪みCと突起Eはバンド溝18の幅の範囲内に位置させるのが好ましい。このような構成とすることにより、突起Eにバンドの締付け力が垂直方向に伝達され、かつ、突出部32と嵌合する窪みCの軸方向への拘束が強化されるため、より安定したシール性が得られる。   The recess C and the protrusion E of the boot 10 are preferably positioned within the range of the width of the band groove 18. With such a configuration, the band tightening force is transmitted to the protrusion E in the vertical direction, and the restraint in the axial direction of the recess C fitted to the protrusion 32 is strengthened. Sex is obtained.

以上の説明ではトリポードタイプ型等速自在継手を例にとったが、本発明は外側継手部材のブーツ取付部が非円筒形状であるすべての等速自在継手に適用することができる。例えば、図11ないし図13に示すように、トリポードタイプのうち外側継手部材のブーツ取付部が円筒形状ではないものにも適用できる。また、トリポードタイプ以外の、例えばダブルオフセットタイプ(図14ないし図16参照)やツェッパタイプ(図17参照)などのトルク伝達部材としてボールを用いた等速自在継手にも適用できる。   In the above description, the tripod type constant velocity universal joint is taken as an example, but the present invention can be applied to all constant velocity universal joints in which the boot mounting portion of the outer joint member has a non-cylindrical shape. For example, as shown in FIG. 11 thru | or FIG. 13, it can apply also to the thing where the boot attachment part of an outer joint member is not cylindrical shape among tripod type. Further, it can be applied to a constant velocity universal joint using a ball as a torque transmitting member other than the tripod type, for example, a double offset type (see FIGS. 14 to 16) or a zepper type (see FIG. 17).

トリポード型等速自在継手の縦断面図である。It is a longitudinal cross-sectional view of a tripod type constant velocity universal joint. 図1のトリポード型等速自在継手の横断面図である。It is a cross-sectional view of the tripod type constant velocity universal joint of FIG. 図1における外側継手部材の要部拡大図である。It is a principal part enlarged view of the outer joint member in FIG. ブーツの縦断面図である。It is a longitudinal cross-sectional view of boots. 図4のブーツの右側面図である。It is a right view of the boot of FIG. 図4のブーツの薄肉部の拡大図である。It is an enlarged view of the thin part of the boot of FIG. 図4のブーツの厚肉部の拡大図である。It is an enlarged view of the thick part of the boot of FIG. 変形例を示すブーツの要部断面図であって、(A)は図6に対応し、(B)は図7に対応する。It is principal part sectional drawing of the boot which shows a modification, Comprising: (A) respond | corresponds to FIG. 6, (B) respond | corresponds to FIG. 別の変形例を示すブーツの要部断面図であって、(A)は図6に対応し、(B)は図7に対応する。It is principal part sectional drawing of the boot which shows another modification, Comprising: (A) respond | corresponds to FIG. 6, (B) respond | corresponds to FIG. 外側継手部材とブーツの接触部の詳細図であって、(A)は両者を別々に示し、(B)は外側継手部材にブーツを嵌合させた状態を示す。It is detail drawing of the contact part of an outer joint member and a boot, Comprising: (A) shows both separately and (B) shows the state which fitted the boot to the outer joint member. 別の実施の形態を示す外側継手部材の斜視図である。It is a perspective view of the outer joint member which shows another embodiment. 図11の外側継手部材の横断面図である。It is a cross-sectional view of the outer joint member of FIG. 図12の外側継手部材のX−O−Y断面図である。FIG. 13 is an X-O-Y cross-sectional view of the outer joint member of FIG. 12. さらに別の実施の形態を示す外側継手部材の斜視図である。It is a perspective view of the outer joint member which shows another embodiment. 図14の外側継手部材の横断面図である。It is a cross-sectional view of the outer joint member of FIG. 図15の外側継手部材の縦断面図である。It is a longitudinal cross-sectional view of the outer joint member of FIG. さらに別の実施の形態を示す外側継手部材の斜視図である。It is a perspective view of the outer joint member which shows another embodiment.

符号の説明Explanation of symbols

1 トリポード型等速自在継手
2 外側継手部材
22 マウス部
22a 大径部
22b 小径部
24 トラック溝
30 ブーツ溝
32 突出部
38 端面
26 ステム部
28 スプライン軸
4 トリポード部材
42 ボス
44 スプライン穴
46 脚軸
6 ローラ
8 針状ころ
10 ブーツ
12 大径取付部
12a 薄肉部
12b 厚肉部
13 ブーツバンド
14 小径取付部
15 ブーツバンド
16 蛇腹部(屈曲部)
18 バンド溝
19 突部
DESCRIPTION OF SYMBOLS 1 Tripod type constant velocity universal joint 2 Outer joint member 22 Mouse | mouth part 22a Large diameter part 22b Small diameter part 24 Track groove 30 Boot groove 32 Projection part 38 End surface 26 Stem part 28 Spline shaft 4 Tripod member 42 Boss
44 Spline hole 46 Leg shaft 6 Roller 8 Needle roller 10 Boot 12 Large diameter mounting portion 12a Thin portion 12b Thick portion 13 Boot band 14 Small diameter mounting portion 15 Boot band 16 Bellow portion (bending portion)
18 Band groove 19 Projection

Claims (1)

第一の回転軸と第二の回転軸を連結する等速自在継手であって、第一の回転軸とトルク伝達可能に結合する外側継手部材と、第二の回転軸とトルク伝達可能に結合する内側継手部材と、外側継手部材と内側継手部材との間に介在してトルクを伝達するトルク伝達部材と、外側継手部材と第二の回転軸との間に装着して継手内部に充填したグリースの漏洩および外部からの異物の侵入を防止するための熱可塑性エラストマー製ブーツとを具備した等速自在継手において、
外側継手部材のブーツ取付部の外周面は、横断面で見ると、大径部と小径部が交互に現れる非円筒形状であって、縦断面で見ると、大径部は、ブーツ溝と、外側継手部材の端面側に位置し前記ブーツ溝よりも大径の突出部とを有し、突出部は、端面から漸次拡径した第一の斜面と、端面から遠ざかるにつれて漸次縮径した第二の斜面とを有し、小径部は直線状であり、
ブーツは、外側継手部材のブーツ取付部と嵌合する大径取付部と、第二の回転軸と嵌合する小径取付部と、大径取付部と小径取付部との間の屈曲部とからなり、大径取付部は、横断面で見ると、外周面が円形で、内周面が外側継手部材のブーツ取付部の外周面形状に沿う、薄肉部と厚肉部が交互に現れる形状であり、大径取付部のすべてが材料により充足され、縦断面で見ると、外周にブーツバンドを受け入れるためのバンド溝が形成してあり、内周は、薄肉部では端面から面取り部、軸線に平行な直線部、窪み、肩当てが連続して形成してあり、厚肉部では面取り部と軸線に平行な直線部が連続して形成してあり、
前記薄肉部の面取り部の端面側径は、前記第一の斜面の最小径よりも大きく、
前記窪みは、外側継手部材の前記突出部を受け入れるため、前記突出部の第一の斜面および第二の斜面と接する第三の斜面および第四の斜面を有し、
ブーツの大径取付部の内周面に全周にわたって突起が形成してあり、
前記突起および前記窪みを前記バンド溝の幅の範囲内に位置させた、ブーツ付き等速自在継手。
A constant velocity universal joint that connects the first rotary shaft and the second rotary shaft, the outer joint member that is coupled to the first rotary shaft so as to be able to transmit torque, and the second rotary shaft that is coupled so as to be able to transmit torque The inner joint member, the torque transmission member that transmits the torque interposed between the outer joint member and the inner joint member, and the outer joint member and the second rotating shaft are mounted to fill the inside of the joint. In a constant velocity universal joint equipped with a thermoplastic elastomer boot for preventing leakage of grease and entry of foreign matter from the outside,
The outer peripheral surface of the boot mounting portion of the outer joint member is a non-cylindrical shape in which a large diameter portion and a small diameter portion appear alternately when viewed in a cross section, and when viewed in a vertical cross section, the large diameter portion is a boot groove, The outer joint member is located on the end face side and has a protruding portion having a diameter larger than that of the boot groove. The protruding portion has a first slope gradually expanding from the end face and a second slope gradually reducing in diameter as the distance from the end face increases. And the small diameter portion is linear,
The boot includes a large-diameter attachment portion that fits into the boot attachment portion of the outer joint member, a small-diameter attachment portion that fits into the second rotating shaft, and a bent portion between the large-diameter attachment portion and the small-diameter attachment portion. The large-diameter mounting portion is a shape in which the outer peripheral surface is circular and the inner peripheral surface conforms to the outer peripheral surface shape of the boot mounting portion of the outer joint member, and the thin-walled portion and the thick-walled portion appear alternately when viewed in cross section. Yes, all of the large-diameter mounting parts are filled with material, and when viewed in a longitudinal section, a band groove for receiving the boot band is formed on the outer periphery, and the inner periphery is from the end face to the chamfered part and the axis in the thin part Parallel straight portions, depressions, shoulder pads are formed continuously, and in the thick wall portion, chamfered portions and straight portions parallel to the axis are formed continuously,
The end surface side diameter of the chamfered portion of the thin portion is larger than the minimum diameter of the first slope,
The recess has a third slope and a fourth slope contacting the first slope and the second slope of the protrusion to receive the protrusion of the outer joint member;
A protrusion is formed on the inner peripheral surface of the large-diameter mounting portion of the boot over the entire circumference.
A constant velocity universal joint with a boot, wherein the protrusion and the depression are positioned within the width of the band groove.
JP2005042495A 2005-02-14 2005-02-18 Constant velocity universal joint with boots Active JP4794867B2 (en)

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PCT/JP2005/022763 WO2006085418A1 (en) 2005-02-14 2005-12-12 Constant velocity universal joint and boot for the same
US11/791,841 US8348774B2 (en) 2005-02-14 2005-12-12 Constant velocity joint and constant velocity joint boot
EP05814222A EP1850024B1 (en) 2005-02-14 2005-12-12 Constant velocity universal joint and boot for the same

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JP2009068510A (en) 2007-09-10 2009-04-02 Ntn Corp Constant velocity universal joint
JP5012771B2 (en) * 2008-11-28 2012-08-29 豊田合成株式会社 Constant velocity joint boots
JP5573211B2 (en) * 2010-02-05 2014-08-20 株式会社ジェイテクト Manufacturing method of outer ring of sliding type constant velocity joint and sliding type constant velocity joint
JP7415699B2 (en) * 2020-03-18 2024-01-17 セイコーエプソン株式会社 optical devices and projectors

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JP2550966Y2 (en) * 1991-04-30 1997-10-15 エヌティエヌ株式会社 Boots for constant velocity joints
JP2000079634A (en) * 1998-09-07 2000-03-21 Nok Corp Boot and molding die therefor
JP4550986B2 (en) * 1999-10-06 2010-09-22 東洋紡績株式会社 Constant velocity joint boots
JP2001106885A (en) * 1999-10-06 2001-04-17 Toyobo Co Ltd Polyester elastomer resin composition
JP2002213484A (en) * 2001-01-15 2002-07-31 Ntn Corp Boot for constant velocity universal joint
JP4189648B2 (en) * 2003-02-25 2008-12-03 Nok株式会社 Constant velocity joint boots
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