WO2005012746A1 - Tripod-type constant velocity joint - Google Patents

Tripod-type constant velocity joint Download PDF

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Publication number
WO2005012746A1
WO2005012746A1 PCT/JP2004/010581 JP2004010581W WO2005012746A1 WO 2005012746 A1 WO2005012746 A1 WO 2005012746A1 JP 2004010581 W JP2004010581 W JP 2004010581W WO 2005012746 A1 WO2005012746 A1 WO 2005012746A1
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WO
WIPO (PCT)
Prior art keywords
roller
constant velocity
velocity universal
peripheral surface
tripod
Prior art date
Application number
PCT/JP2004/010581
Other languages
French (fr)
Japanese (ja)
Inventor
Yoji Sato
Masafumi Nakakoji
Tetsuro Kadota
Original Assignee
Ntn Corporation
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Publication date
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Publication of WO2005012746A1 publication Critical patent/WO2005012746A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/202—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints
    • F16D3/205—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
    • F16D3/2055—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part having three pins, i.e. true tripod joints

Definitions

  • the present invention relates to a sliding type constant velocity universal joint used for transmitting power to automobiles and various industrial machines.
  • a conventional general tripod type constant velocity universal joint includes an outer joint member 1, an inner joint member 2, and a roller 3, as shown in FIG.
  • the roller 3 is rotatably supported by a 21 dollar bearing structure. That is, a number of needle rollers 4 are interposed between the trunnion journal 2 a of the inner joint member 2 and the rollers 3, and a washer 5 is arranged to prevent the needle roller 4 from dropping off, and the washer 5 is disengaged.
  • a retaining ring 6 is attached to stop.
  • a roller interposed between the outer joint member and the trunnion journal to transmit the torque generally has a bearing of $ 21. The mechanism is attached.
  • a twenty-one dollar port is arranged directly on the cylindrical outer peripheral surface of the trunnion journal. Needle bearings are formed between the inner peripheral surface and the inner peripheral surface.
  • the tripod-type constant velocity universal joint disclosed in Japanese Patent No. 26323214 employs a double roller type which is relatively rotatable via a needle roller.
  • a so-called tri-knob type tripod in which a cylindrical inner peripheral surface of a roller is externally fitted to a spherical trunnion journal.
  • a type constant velocity universal joint is described. Disclosure of the invention A general tripod-type constant velocity universal joint employs a 21 dollar bearing mechanism, and therefore has the following problems.
  • the size of the outer joint member must be as large as possible. It has to be large enough to incorporate the pairing mechanism.
  • a main object of the present invention is to reduce the size and cost of a tripod type constant velocity universal joint.
  • a track groove extending in the axial direction is formed at a circumferentially equal position on the inner peripheral surface at three equally divided positions.
  • the inner peripheral surface of the roller is formed in an arc-shaped convex cross section, and the outer peripheral surface of the trunnion journal is straight in the vertical cross section, and contacts the inner peripheral surface of the roller in a direction perpendicular to the joint axis in the cross section. And a clearance is formed between the inner peripheral surface of the roller and the joint in the axial direction of the joint.
  • the trunnion journal and the roller, and the roller and the outer joint member are in direct contact with each other.
  • the resistance to the sliding movement and the rotation movement of the roller can be reduced by making the convex surfaces contact each other and reducing the contact area. Therefore, by making the inner peripheral surface of the roller externally fitted to the trunnion journal into an arc-shaped convex cross section, the roller comes into contact with a small area, and the resistance of the sliding motion and the rotational motion of the roller in the axial direction of the trunnion journal is reduced. Decrease. In that case, the number of parts is significantly smaller than that of the conventional tripod type constant velocity universal joint.
  • the trunnion journal has a substantially elliptical cross section.
  • substantially elliptical is not limited to a literal ellipse, but includes shapes generally referred to as an oval, an oval, and the like.
  • the surfaces that come into contact with each other, that is, one or both of the outer peripheral surface of the trunnion journal and the inner peripheral surface of the roller, and one or both of the outer peripheral surface of the roller and the inner surface of the roller joint outer member are resistant to It is preferable to perform a surface treatment for the purpose of improving abrasion or low friction.
  • the tripod type constant velocity universal joint of the present invention has a structure that does not use a rolling element such as a doll roller, as compared with a conventional general tripod type constant velocity universal joint, so that the number of parts can be reduced, and Costs can be reduced.
  • FIG. 1A is a front view showing a cross section of a part of a tripod type constant velocity universal joint according to a first embodiment.
  • FIG. 1B is a plan view of the trunnion journal and rollers in FIG. 1A.
  • FIG. 2 is a longitudinal sectional view of the tripod type constant velocity universal joint of FIG. 1A.
  • FIG. 3 is a sectional view of a roller in the tripod constant velocity universal joint of FIG. 1A.
  • FIG. 4 is a front view of a cross section of a part of a tri-board type constant velocity universal joint showing a conventional technique.
  • BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
  • This tripod-type constant velocity universal joint is composed of three types of parts, an outer joint member 10, an inner joint member 20, and a roller 30. The number of parts is significantly smaller than that of).
  • the outer joint member 10 includes a substantially cylindrical mouth portion 12 opened at one end, and a stem portion 14 having a selection shaft portion for coupling to an input or output shaft.
  • a track groove 16 extending in the axial direction is formed on the inner peripheral surface of the mouse part 12 at three equally circumferential positions.
  • the side walls of the track grooves that face each other in the circumferential direction serve as a roller guide surface 18 that provides a trajectory for a roller 30 described later to roll.
  • the roller guide surface 18 is a part of a cylindrical surface parallel to the axis of the outer joint member 10.
  • the inner joint member 20 includes a boss 22 and a projection journal 26 protruding from the boss 22 in the radial direction.
  • the boss portion 22 is formed with a selection hole 22 for coupling to an output shaft or an input shaft.
  • the trunnion journals 26 are formed on the outer peripheral surface of the boss portion 22 at three equally circumferential positions, and each trunnion journal 26 rotatably carries a roller 30.
  • the roller 30 has an inner peripheral surface 32 having an arc-shaped cross section in a convex arc shape and an outer peripheral surface 34 having a spherical shape.
  • the generatrix of the inner peripheral surface 32 of the roller 30 has a convex arc shape
  • the generatrix of the outer peripheral surface 34 has a convex arc shape having substantially the same curvature as the roller guide surface 18 of the outer joint member 10.
  • the inner peripheral surface 32 of the roller 30 is in direct contact with the outer peripheral surface 28 of the trunnion journal 26 without the rolling element such as a needle roller between the trunnion journal 26 and the roller 30.
  • the cross section of the trunnion journal 26 is elliptical, and the minor axis of the ellipse extends in the axial direction of the joint. Therefore, a predetermined gap 36 (FIG.
  • the roller 30 is capable of moving the trunnion journal 26 in the axial direction and swinging with respect to the trunnion journal 26.
  • the inner joint member 20 is located inside the outer joint member 10, and the roller 3 rotatably supported by the trunnion journal 26 of the inner joint member 20. 0 is stored in the track groove 16 of the outer joint member 10.
  • the roller 30 is disposed on the trunnion journal 26 because the tangent ellipse with the trunnion journal 26 is close to a point. Rotation and axial movement can be performed smoothly.
  • Examples of such surface treatments include lubricating J3 treatment, metal spraying, plating, and attaching a sliding material.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

A tripod-type constant velocity joint, where contact between a trunnion journal (26) and a roller (30) and contact between the roller (30) and an outer joint member (10) are directly made without rolling bodies therebetween, and elliptical contact between the trunnion journal (26) and the roller (30) is made to be almost a point-contact.

Description

トリポ一ド型等速自在継手 技術分野 本発明は、 自動車や各種産業機械の動力伝達用に利用される摺動型等速自在継 手に関する。 明  TECHNICAL FIELD The present invention relates to a sliding type constant velocity universal joint used for transmitting power to automobiles and various industrial machines. Light
背景細技術 従来の一般的なトリポード型等速自在継手は、 図 4に示すように、 外側継手部 材 1と内側継手部材 2とローラ 3を具備している。 ローラ 3は二一ドルベアリン グ構造で回転自在に支持されている。 すなわち、 内側継手部材 2のトラニオンジ ャ一ナル 2 aとローラ 3との間に多数の二一ドルローラ 4を介在させ、 ニードル ローラ 4の脱落を防止するためヮヅシャ 5を配置し、 そのヮッシャ 5の抜け止め をするため止め輪 6を装着してある。 このようにトリポ一ド型等速自在継手では、 誘起力を低減するために、 外側継手部材とトラニオンジャーナルとの間に介在し てトルクを伝達する働きをするローラには一般に二一ドルべァリング機構が付カロ されている。 具体的には、 特公平 3— 1 5 2 9号公報に記載されたトリボード型 等速自在継手では、 トラニオンジャーナルの円筒形状外周面上に直接二一ドル口 —ラが並べられ、 口一ラ内周面との間でニードルべァリングが形成されている。 特許第 2 6 2 3 2 1 4号公報に記載されたトリポ一ド型等速自在継手では、 二一 ドルローラを介して相対回転自在のダブルローラタイプを採用している。 なお、 特開平 7— 3 1 7 7 8 9号公報には、 記載されたトリノブ型では、 球状 のトラニオンジャーナルにローラの円筒形状内周面を外嵌させた、 いわゆるトリ ノブ型のトリポ一ド型等速自在継手が記載されている。 発明の開示 一般的な卜リポード型等速自在継手は、 二一ドルベアリング機構を採用してい るため、 次のような問題がある。 BACKGROUND ART A conventional general tripod type constant velocity universal joint includes an outer joint member 1, an inner joint member 2, and a roller 3, as shown in FIG. The roller 3 is rotatably supported by a 21 dollar bearing structure. That is, a number of needle rollers 4 are interposed between the trunnion journal 2 a of the inner joint member 2 and the rollers 3, and a washer 5 is arranged to prevent the needle roller 4 from dropping off, and the washer 5 is disengaged. A retaining ring 6 is attached to stop. As described above, in the tripod type constant velocity universal joint, in order to reduce the induced force, a roller interposed between the outer joint member and the trunnion journal to transmit the torque generally has a bearing of $ 21. The mechanism is attached. Specifically, in the tri-board type constant velocity universal joint described in Japanese Patent Publication No. 3-1529, a twenty-one dollar port is arranged directly on the cylindrical outer peripheral surface of the trunnion journal. Needle bearings are formed between the inner peripheral surface and the inner peripheral surface. The tripod-type constant velocity universal joint disclosed in Japanese Patent No. 26323214 employs a double roller type which is relatively rotatable via a needle roller. In the case of the tri-knob type described in Japanese Patent Application Laid-Open No. Hei 7-31 779 89, a so-called tri-knob type tripod in which a cylindrical inner peripheral surface of a roller is externally fitted to a spherical trunnion journal. A type constant velocity universal joint is described. Disclosure of the invention A general tripod-type constant velocity universal joint employs a 21 dollar bearing mechanism, and therefore has the following problems.
( 1 ) ベアリングとして使われる転走面の面粗さを精度良く出すために高精度の 研削仕上げの必要があり、 結果として製作費が上がる。  (1) It is necessary to perform high-precision grinding in order to accurately obtain the surface roughness of the rolling surface used as a bearing, resulting in higher production costs.
( 2 ) ベアリングを構成する二一ドルローラと口一ラは、 継手として必要な弓蛍度 を得るためには部品の寸法をある大きさを確保しなければならず、 外側継手部材 の外径はペアリング機構を組み入れる分だけ大きくしなければならない。  (2) In order to obtain the necessary bow fluorescence as a joint, the size of the outer joint member must be as large as possible. It has to be large enough to incorporate the pairing mechanism.
だけ大きくしなければならない。 Just have to be bigger.
( 3 ) 二一ドルベアリング機構を構成する多数のニードルローラのほか、 ニード ルローラの脱落防止のための止め輪類が必要であるため、 部品点数が多い。 また、 トリポード型等速自在継手では、 継手が折り曲げ角をとつて回転すると き、 外側継手部材のトラック溝内をスライドするローラは、 トラニオンジャーナ ル上で内側継手部材の半径方向 （トラニオンジャーナルの軸方向） にも摺動しな ければならない。 その方向は従来一般のトリボード型等速自在継手が備えている ベアリングの回転方向とは直角な方向であり、 ペアリングはこの方向の運動には 機能していない。 特開平 7— 3 1 7 7 8 9号公報に示されるトリノプ型のトリポード型等速自在 継手では、 負荷容量を大きくするため線接触としているが、 それが接触面積を大 きくし、 NVH特性を悪くしている。 すなわち、 トリノブ型ジョイントでは、 継 手が折り曲げ角をとつて回転するとき、 外側継手部材のトラック溝内をスライド するローラの内径とトラニオンジャーナルとは線接触で接触面積が大きいため、 ローラの回転運動の抵抗となっている。 本発明の主要な目的は、 トリポ一ド型等速自在継手のコンパクト化と低コスト 化にある。 本発明は、 内周面の円周方向三等分位置に軸方向に延びるトラック溝を形成し た外側継手部材と、 外周面の円周方向三等分位置に半径方向に突出するトラニォ ンジャーナルを形成した内側継手部材と、 内側継手部材の各トラニオンジャーナ ルに担持され、 外側継手部材のトラヅク溝内に収容されたローラとを具備したト リポ一ド型等速自在継手において、 (3) In addition to a large number of needle rollers that compose the 21-dollar bearing mechanism, snap rings for preventing the needle rollers from dropping out are required, so the number of parts is large. Also, in the tripod type constant velocity universal joint, when the joint rotates at a bending angle, the roller that slides in the track groove of the outer joint member moves on the trunnion journal in the radial direction of the inner joint member (the axis of the trunnion journal). Direction). The direction is perpendicular to the rotation direction of the bearing provided in the conventional general tri-board type constant velocity universal joint, and pairing does not function in this direction. In the Trinop type tripod type constant velocity universal joint disclosed in Japanese Patent Application Laid-Open Publication No. Hei 7-317 789, linear contact is used to increase the load capacity, but this increases the contact area and degrades NVH characteristics. are doing. In other words, when the joint rotates at a bending angle, the inner diameter of the roller that slides in the track groove of the outer joint member and the trunnion journal have a large contact area with the trunnion journal. Resistance. A main object of the present invention is to reduce the size and cost of a tripod type constant velocity universal joint. According to the present invention, a track groove extending in the axial direction is formed at a circumferentially equal position on the inner peripheral surface at three equally divided positions. Outer joint member, an inner joint member formed with trunnion journals protruding in the radial direction at circumferentially equal positions on the outer peripheral surface, and a track of the outer joint member carried by each trunnion journal of the inner joint member. In a tripod type constant velocity universal joint having a roller housed in a groove,
ローラ内周面を円弧状凸断面に形成し、 トラニオンジャーナルの外周面を、 縦 断面においてはストレート形状とし、 かつ、 横断面においては継手の軸線と直交 する方向で前記ローラの内周面と接触するとともに継手の軸線方向で前記ローラ の内周面との間にすきまを形成するようにしており、  The inner peripheral surface of the roller is formed in an arc-shaped convex cross section, and the outer peripheral surface of the trunnion journal is straight in the vertical cross section, and contacts the inner peripheral surface of the roller in a direction perpendicular to the joint axis in the cross section. And a clearance is formed between the inner peripheral surface of the roller and the joint in the axial direction of the joint.
トラニオンジャーナルとローラ、 ローラと外側継手部材がそれそれ直接接触す ることを特徴とするものである。 ローラの摺動運動と回転運動に対する抵抗は、 凸面同士の接触とし、 接触面積 を小さくすることで下げることができる。 そこで、 トラニオンジャーナルに外嵌 するローラの内周面を円弧状凸断面とすることで、 小さな面積で接触することに なり、 トラニオンジャーナルの軸方向に対するローラの摺動運動と回転運動の抵 抗が減少する。 その場合、 部品点数は従来のトリポ一ド型等速自在継手に比べ大 幅に少なくなる。 トラニオンジャーナルは、 横断面を略楕円形状とする。 略楕円 状とは、 字義どおりの楕円に限らず、 一般に卵形、 小判形等と称される形状を含 むものとする。 相互に接触する面すなわち、 トラニオンジャ一ナルの外周面とローラの内周面 のいずれか一方または両方、 および、 ローラの外周面と外側継手部材のローラ案 内面のいずれか一方または両方に、 耐摩耗性または低摩擦化の向上を目的とする 表面処理を施すのが好ましい。 相互に接触する面すなわち、 トラニオンジャーナルの外周面とローラの内周面 のいずれか一方または両方、 および、 ローラの外周面と外側継手部材のローラ案 内面のいずれか一方または両方に、 潤滑剤の介入を促進する油溝を設けるのが好 ましい。 本発明のトリポ一ド型等速自在継手は、 従来の一般的なトリポード型等速自在 継手と比較して、 二一ドルローラ等の転動体を用いない構造であるので部品点数 を削減でき、 製造コストを下げることができる。 外側継手部材と内側継手部材と ローラといった 3種の部品のみから構成されるので、 内部にスペースが多く、 各 部品の肉厚を増大させることができ、 強度面において有利である。 また、 トラニ オンジャーナルにローラが直接接触する構成であるため、 部品点数が少なく組立 てが容易であるばかりでなく、 転動体の脱落防止のための止め輪等が不要である ためローラの幅を小さくすることができ、 その結果、 外側継手部材の外径を小さ くして継手全体をきわめて小型 ·コンパクト化することができる。 さらに、 トラ 二オンジャーナルとローラの内周面との接触楕円が点に近いものとなるため、 摺 動運動と回転運動の抵抗が小さく、 NVH特性に有利である。 図面の簡単な説明 図 1 Aは第一の実施の形態を示すトリポード型等速自在継手の一部を断面にし た正面図である。 The trunnion journal and the roller, and the roller and the outer joint member are in direct contact with each other. The resistance to the sliding movement and the rotation movement of the roller can be reduced by making the convex surfaces contact each other and reducing the contact area. Therefore, by making the inner peripheral surface of the roller externally fitted to the trunnion journal into an arc-shaped convex cross section, the roller comes into contact with a small area, and the resistance of the sliding motion and the rotational motion of the roller in the axial direction of the trunnion journal is reduced. Decrease. In that case, the number of parts is significantly smaller than that of the conventional tripod type constant velocity universal joint. The trunnion journal has a substantially elliptical cross section. The term “substantially elliptical” is not limited to a literal ellipse, but includes shapes generally referred to as an oval, an oval, and the like. The surfaces that come into contact with each other, that is, one or both of the outer peripheral surface of the trunnion journal and the inner peripheral surface of the roller, and one or both of the outer peripheral surface of the roller and the inner surface of the roller joint outer member are resistant to It is preferable to perform a surface treatment for the purpose of improving abrasion or low friction. Lubricants are applied to the surfaces that come into contact with each other, that is, one or both of the outer peripheral surface of the trunnion journal and the inner peripheral surface of the roller, and one or both of the outer peripheral surface of the roller and the inner surface of the roller joint outer member. It is preferable to have an oil gutter to facilitate intervention. The tripod type constant velocity universal joint of the present invention has a structure that does not use a rolling element such as a doll roller, as compared with a conventional general tripod type constant velocity universal joint, so that the number of parts can be reduced, and Costs can be reduced. Since it is composed of only three types of parts, the outer joint member, the inner joint member, and the roller, there is a lot of internal space, and the thickness of each part can be increased, which is advantageous in terms of strength. In addition, since the rollers are in direct contact with the trunnion journal, the number of parts is small and assembly is easy.In addition, the width of the rollers is reduced because no retaining ring is required to prevent the rolling elements from falling off. As a result, the outer diameter of the outer joint member can be reduced, and the entire joint can be made extremely small and compact. Furthermore, since the contact ellipse between the transmission journal and the inner peripheral surface of the roller is close to a point, the resistance of sliding motion and rotational motion is small, which is advantageous for NVH characteristics. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a front view showing a cross section of a part of a tripod type constant velocity universal joint according to a first embodiment.
図 1 Bは図 1 Aにおけるトラニオンジャーナルとローラの平面図である。 図 2は図 1 Aのトリポード型等速自在継手の縦断面図である。  FIG. 1B is a plan view of the trunnion journal and rollers in FIG. 1A. FIG. 2 is a longitudinal sectional view of the tripod type constant velocity universal joint of FIG. 1A.
図 3は図 1 Aのトリポード型等速自在継手におけるローラの断面図である。 図 4は従来の技術を示すトリボード型等速自在継手の一部を断面にした正面図 である。 発明を実施するための最良の形態 以下、 本発明の^の形態を図面に従って説明する。 まず、 図 1 A, 1 B 3 2に従ってトリボード型等速自在継手の基本構成を説明 する。このトリポ一ド型等速自在継手は、外側継手部材 1 0、 内側継手部材 2 0、 ローラ 3 0の 3種の部品から構成されており、 従来のトリポ一ド型等速自在継手 (図 6参照） に比べて部品点数が大幅に少ない。 具体的には、 二一ドルべアリン グを構成する多数のニードルローラと、 その二一ドルローラの S兌落を防止するた めの止め輪類が省略されている。 外側継手部材 1 0は、 一端にて開口した略円筒状のマウス部 1 2と、 入力また は出力軸と結合するためのセレ一シヨン軸部を備えたステム部 1 4とを含む。 マ ウス部 1 2の内周面には円周方向の三等分位置に軸方向に延びるトラック溝 1 6 が形成されている。 円周方向で向かい合ったトラック溝の側壁が、 後述する口一 ラ 3 0が転動するための軌道を提供するローラ案内面 1 8となる。 この実施の形 態では、 ローラ案内面 1 8は外側継手部材 1 0の軸線と平行な円筒面の一部であ る。 内側継手部材 2 0はボス部 2 2とそのボス部 2 2から半径方向に突出したトラ 二オンジャーナル 2 6とからなる。 ボス部 2 2には出力軸または入力軸と結合す るためのセレ一シヨン孔 2 2を形成してある。 トラニオンジャーナル 2 6は、 ボ ス部 2 2の外周面に円周方向三等分位置に形成してあり、 各トラニオンジャーナ ル 2 6がローラ 3 0を回転可能に担持する。 ローラ 3 0は、 図 3に示すように、 軸方向断面が凸円弧形状の内周面 3 2と、 球面状の外周面 3 4を有する。 ローラ 3 0の内周面 3 2の母線は凸円弧形状で、 外周面 3 4の母線は外側継手部材 1 0のローラ案内面 1 8とほぼ同じ曲率の凸円 弧形状である。 トラニオンジャーナル 2 6とローラ 3 0とは、 ニードルローラ等 の転動体を介することなく、 ローラ 3 0の内周面 3 2はトラニオンジャーナル 2 6の外周面 2 8と直接、 接触する。 この第一の実施の形態では、 トラニオンジャーナル 2 6の横断面が楕円形状で あり、 その楕円の短径が継手の軸方向に延びている。 したがって、 トラニオンジ ヤーナル 2 6とローラ 3 0との間に所定のすきま 3 6 (図 2 ) が形成される。 こ れにより、 ローラ 3 0はトラニオンジャーナル 2 6の軸方向への移動とトラニォ ンジャーナル 2 6に対する首振り揺動運動が可能である。 このトリボード型等速自在継手は、 組み立てた状態では、 外側継手部材 1 0の 内側に内側継手部材 2 0が位置し、 内側継手部材 2 0のトラニオンジャーナル 2 6に回転自在に担持されたローラ 3 0が外側継手部材 1 0のトラック溝 1 6に収 容される。 継手が折り曲げ角 （作動角） をとつた状態でトルクを伝達するとき、 ローラ 3 0は、 トラニオンジャーナル 2 6との接角虫楕円が点に近いものとなるこ とから、 トラニオンジャーナル 2 6に対する回転と軸方向移動を円滑に行うこと ができる。 そして、 内側継手部材を入力側とすると、 トラニオンジャ一ナル 2 6 とローラ 3 0との接触部分を介して内側継手部材 2 0からローラ 3 0にトルクが 伝達され、 さらに、 ローラ 3 0とローラ案内面 1 8との接触部分を介してローラ 3 0から外側継手部材 1 0にトルクが伝達される。 上述の実施の形態において、 接触部の耐摩耗性を向上させ、 あるいは低摩擦化 を図るため、 トラニオンジャーナル 2 6の外周面 2 8とローラ 3 0の内周面 3 2 のいずれか一方または両方、 ローラ 3 0の外周面 3 4とローラ案内面 1 8のいず れか一方または両方に、 適当な表面処理を施すことが好ましい。 そのような表面 処理の例としては、 潤滑被 J3莫処理、 金属溶射、 めっき、 すべり材を貼り付けるこ と等が挙げられる。 また、 トラニオンジャーナル 2 6の外周面 2 8とローラ 3 0の内周面 3 2のい ずれか一方または両方、 ローラ 3 0の外周面 3 4とローラ案内面 1 8のいずれか 一方または両方に、 当該接触面間への潤滑剤の介入を促進するため、 油溝を設け るのが好ましい。 FIG. 3 is a sectional view of a roller in the tripod constant velocity universal joint of FIG. 1A. FIG. 4 is a front view of a cross section of a part of a tri-board type constant velocity universal joint showing a conventional technique. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a basic configuration of Toribodo type constant velocity universal joint according to FIG. 1 A, 1 B 3 2. This tripod-type constant velocity universal joint is composed of three types of parts, an outer joint member 10, an inner joint member 20, and a roller 30. The number of parts is significantly smaller than that of). Specifically, 21 dollar bears A large number of needle rollers and the retaining rings for preventing the 21 dollar rollers from falling into S are omitted. The outer joint member 10 includes a substantially cylindrical mouth portion 12 opened at one end, and a stem portion 14 having a selection shaft portion for coupling to an input or output shaft. A track groove 16 extending in the axial direction is formed on the inner peripheral surface of the mouse part 12 at three equally circumferential positions. The side walls of the track grooves that face each other in the circumferential direction serve as a roller guide surface 18 that provides a trajectory for a roller 30 described later to roll. In this embodiment, the roller guide surface 18 is a part of a cylindrical surface parallel to the axis of the outer joint member 10. The inner joint member 20 includes a boss 22 and a projection journal 26 protruding from the boss 22 in the radial direction. The boss portion 22 is formed with a selection hole 22 for coupling to an output shaft or an input shaft. The trunnion journals 26 are formed on the outer peripheral surface of the boss portion 22 at three equally circumferential positions, and each trunnion journal 26 rotatably carries a roller 30. As shown in FIG. 3, the roller 30 has an inner peripheral surface 32 having an arc-shaped cross section in a convex arc shape and an outer peripheral surface 34 having a spherical shape. The generatrix of the inner peripheral surface 32 of the roller 30 has a convex arc shape, and the generatrix of the outer peripheral surface 34 has a convex arc shape having substantially the same curvature as the roller guide surface 18 of the outer joint member 10. The inner peripheral surface 32 of the roller 30 is in direct contact with the outer peripheral surface 28 of the trunnion journal 26 without the rolling element such as a needle roller between the trunnion journal 26 and the roller 30. In the first embodiment, the cross section of the trunnion journal 26 is elliptical, and the minor axis of the ellipse extends in the axial direction of the joint. Therefore, a predetermined gap 36 (FIG. 2) is formed between the trunnion journal 26 and the roller 30. As a result, the roller 30 is capable of moving the trunnion journal 26 in the axial direction and swinging with respect to the trunnion journal 26. In this assembled state, the inner joint member 20 is located inside the outer joint member 10, and the roller 3 rotatably supported by the trunnion journal 26 of the inner joint member 20. 0 is stored in the track groove 16 of the outer joint member 10. When the joint transmits a torque at a bending angle (operating angle), the roller 30 is disposed on the trunnion journal 26 because the tangent ellipse with the trunnion journal 26 is close to a point. Rotation and axial movement can be performed smoothly. Then, assuming that the inner joint member is on the input side, torque is transmitted from the inner joint member 20 to the roller 30 via a contact portion between the trunnion journal 26 and the roller 30, and furthermore, the roller 30 and the roller Torque is transmitted from the roller 30 to the outer joint member 10 via a contact portion with the guide surface 18. In the above-described embodiment, in order to improve the wear resistance of the contact portion or to reduce the friction, one or both of the outer peripheral surface 28 of the trunnion journal 26 and the inner peripheral surface 32 of the roller 30 are used. Preferably, one or both of the outer peripheral surface 34 of the roller 30 and the roller guide surface 18 are subjected to an appropriate surface treatment. Examples of such surface treatments include lubricating J3 treatment, metal spraying, plating, and attaching a sliding material. In addition, one or both of the outer peripheral surface 28 of the trunnion journal 26 and the inner peripheral surface 32 of the roller 30, and / or one or both of the outer peripheral surface 34 of the roller 30 and the roller guide surface 18. However, it is preferable to provide an oil groove in order to facilitate the intervention of the lubricant between the contact surfaces.

Claims

請求の範囲 The scope of the claims
1 . 内周面の円周方向三等分位置に軸方向に延びるトラック溝を形成した外側 継手部材と、 外周面の円周方向三等分位置に半径方向に突出するトラニオンジャ —ナルを形成した内側継手部材と、 内側継手部材の各トラニオンジャーナルに担 持され、 外側継手部材のトラヅク溝内に収容されたローラとを具備したトリポー ド型等速自在継手において、 1. An outer joint member with a track groove extending in the axial direction at the circumferentially equal position on the inner peripheral surface, and a trunnion journal projecting radially at the circumferentially equal position on the outer peripheral surface. A tripod-type constant velocity universal joint comprising: an inner joint member formed as described above; and a roller supported by each trunnion journal of the inner joint member and housed in a track groove of the outer joint member.
口一ラ内周面を円弧状凸断面に形成し、 トラニオンジャーナルの外周面を、 縦 断面においてはストレート形状とし、 かつ、 横断面においては継手の軸線と直交 する方向で前記口一ラ内周面と接触するとともに継手の軸線方向で前記ローラの 内周面との間にすきまを形成するようにしてなり、  The inner peripheral surface of the mouth roller is formed in an arc-shaped convex cross-section, and the outer peripheral surface of the trunnion journal is straight in a vertical cross-section, and in a cross-section in a direction perpendicular to the axis of the joint. And a clearance is formed between the roller and the inner peripheral surface of the roller in the axial direction of the joint.
トラニオンジャーナルとローラ、 口一ラと外側継手部材がそれそれ直接接触す るトリボード型等速自在継手。  A tri-board type constant velocity universal joint in which the trunnion journal and roller, the outer joint and the outer joint member are in direct contact with each other.
2 . トラニオンジャーナルの横断面を長軸が継手の軸線に直交する略楕円形状 とした請求項 1のトリポード型等速自在継手。 2. The tripod-type constant velocity universal joint according to claim 1, wherein the cross section of the trunnion journal is formed in a substantially elliptical shape whose major axis is orthogonal to the axis of the joint.
3 . 前記ローラの外周面が球状に形成され、 外側継手部材のトラック溝とアン ギユラコンタクトする請求項 1のトリポード型等速自在継手。 3. The tripod-type constant velocity universal joint according to claim 1, wherein the outer peripheral surface of the roller is formed in a spherical shape, and is in angular contact with the track groove of the outer joint member.
4 . トラニオンジャーナルの外周面のうちローラ内周面と接触する領域のみ研 削加工されている請求項 1のトリポード型等速自在継手。 4. The tripod type constant velocity universal joint according to claim 1, wherein only a region of the outer peripheral surface of the trunnion journal that comes into contact with the inner peripheral surface of the roller is ground.
5 . トラニオンジャーナルに耐摩耗性の向上を目的とする表面処理を施した請 求項 1ないし 4のいずれかのトリポード型等速自在継手。 5. The tripod constant velocity universal joint according to any one of claims 1 to 4, wherein the trunnion journal has been subjected to a surface treatment for improving wear resistance.
6 . ローラの内周面に耐摩耗性または低摩擦ィ匕の向上を目的とする表面処理を 施した請求項 1ないし 5のいずれかのトリポ一ド型等速自在継手。 6. The tripod constant velocity universal joint according to any one of claims 1 to 5, wherein the inner peripheral surface of the roller is subjected to a surface treatment for improving abrasion resistance or low friction.
7 . ローラの外周面に耐摩耗性または低摩擦化の向上を目的とする表面処理を 施した請求項 1ないし 6のいずれかのトリポ一ド型等速自在継手。 7. Apply a surface treatment to the outer surface of the roller to improve wear resistance or low friction. The tripod type constant velocity universal joint according to any one of claims 1 to 6, wherein:
8 . 外側継手部材のローラ案内面に耐摩耗性または低摩擦化の向上を目的とす る表面処理を施した請求項 1ないし 7のいずれかのトリポ一ド型等速自在継手。 8. The tripod constant velocity universal joint according to any one of claims 1 to 7, wherein the roller guide surface of the outer joint member is subjected to a surface treatment for improving abrasion resistance or low friction.
9 . トラニオンジャーナルに潤滑剤の介入を促進する油溝を設けた請求項 1な いし 8のいずれかのトリポ一ド型等速自在継手。 9. The tripod constant velocity universal joint according to any one of claims 1 to 8, wherein an oil groove is provided in the trunnion journal to facilitate the intervention of the lubricant.
1 0 . ローラの内周面に潤滑剤の介入を促進する油溝を設けた請求項 1ないし 9のいずれかのトリポード型等速自在継手。 10. The tripod-type constant velocity universal joint according to any one of claims 1 to 9, wherein an oil groove is provided on an inner peripheral surface of the roller to facilitate the intervention of a lubricant.
1 1 . ローラの外周面に潤滑剤の介入を促進する油溝を設けた請求項 1ないし 1 0のいずれかのトリポ一ド型等速自在継手。 11. The tripod constant velocity universal joint according to any one of claims 1 to 10, wherein an oil groove is provided on an outer peripheral surface of the roller to facilitate the intervention of a lubricant.
1 2 . 外側継手部材のローラ案内面に潤滑剤の介入を促進する油溝を設けた請 求項 1ないし 1 1のいずれかのトリポード型等速自在継手。 12. The tripod constant velocity universal joint according to any one of claims 1 to 11, wherein an oil groove is provided on the roller guide surface of the outer joint member to facilitate the intervention of the lubricant.
PCT/JP2004/010581 2003-07-31 2004-07-16 Tripod-type constant velocity joint WO2005012746A1 (en)

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JP4943169B2 (en) * 2007-01-23 2012-05-30 Ｎｔｎ株式会社 Tripod type constant velocity universal joint
JP2010090937A (en) * 2008-10-06 2010-04-22 Ntn Corp Tripod-type constant velocity universal joint
WO2011114505A1 (en) * 2010-03-19 2011-09-22 Ntn株式会社 Tripod constant velocity universal joint
US10174793B2 (en) 2013-10-30 2019-01-08 Steering Solutions Ip Holding Corporation Tripot constant velocity joint
KR101884926B1 (en) * 2014-10-30 2018-08-02 스티어링 솔루션즈 아이피 홀딩 코오포레이션 Tripot constant velocity joint
KR102222279B1 (en) * 2019-01-29 2021-03-04 서한산업(주) Constant velocity joint assembly having integrated roller

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