JP2007211804A - Constant velocity universal joint - Google Patents

Constant velocity universal joint Download PDF

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JP2007211804A
JP2007211804A JP2006029561A JP2006029561A JP2007211804A JP 2007211804 A JP2007211804 A JP 2007211804A JP 2006029561 A JP2006029561 A JP 2006029561A JP 2006029561 A JP2006029561 A JP 2006029561A JP 2007211804 A JP2007211804 A JP 2007211804A
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roller
ring
leg shaft
constant velocity
velocity universal
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JP2006029561A
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Japanese (ja)
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Masaru Takei
大 武井
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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    • 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
    • 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
    • F16D2003/2026—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 with trunnion rings, i.e. with tripod joints having rollers supported by a ring on the trunnion

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constant velocity universal joint capable of reducing induced thrust, capable of reducing a shudder phenomenon of a vehicle, and capable of preventing generation of an abnormal sound in a no-load state. <P>SOLUTION: This constant velocity universal joint has an outside joint member 1 forming three track grooves 6 having a roller guide surface 7 oppositely arranged in the circumferential direction, a tripod member 2 having three leg shafts 9 projecting in the radial direction, a roller 3 inserted into the track grooves 6 and a ring 12 fitted around the leg shafts 9 and rotatably supporting the roller 3, and can move a roller assembly 14 composed of the roller 3 and the ring 12 in the axial direction of the outside joint member 1 along the roller guide surface 7. An inclination of the leg shafts 9 is allowed while making the roller assembly 14 correspond to the roller guide surface 7 in a state of taking an operating angle, and an elastic body 20 is interposed in a clearance 16 for maintaining an attitude of the roller assembly 14 to the leg shafts 9 in the no-load state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、自動車や各種産業機械等の動力伝達装置に使用される等速自在継手に関し、特に摺動式トリポード型等速自在継手に関するものである。 The present invention relates to a constant velocity universal joint used for power transmission devices such as automobiles and various industrial machines, and more particularly to a sliding tripod type constant velocity universal joint.

図７と図８に示すように、等速自在継手（トリポード型等速自在継手）は、外側継手部材５１と、内側継手部材としてのトリポード部材５２と、トルク伝達部材としてのローラ５３を主要な構成要素としている。   As shown in FIGS. 7 and 8, the constant velocity universal joint (tripod type constant velocity universal joint) includes an outer joint member 51, a tripod member 52 as an inner joint member, and a roller 53 as a torque transmission member. As a component.

外側継手部材５１は一体に形成されたマウス部５４とステム部５５とからなる。マウス部５４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５６が形成してある。マウス部５４は、横断面（図８参照）で見ると、大径部５４ａと小径部５４ｂが交互に現れる非円筒形状である。すなわち、マウス部５４は、大径部５４ａと小径部５４ｂとを形成することによって、その内周面に、軸方向に延びる３本の前記トラック溝５６が形成される。各トラック溝５６の円周方向で向き合った側壁にローラ案内面５７、５７が形成される。   The outer joint member 51 includes a mouth portion 54 and a stem portion 55 that are integrally formed. The mouse portion 54 has a cup shape opened at one end, and a track groove 56 extending in the axial direction is formed at a position of the inner circumference in the circumferential direction. The mouse portion 54 has a non-cylindrical shape in which a large diameter portion 54a and a small diameter portion 54b appear alternately when viewed in a cross section (see FIG. 8). That is, the mouse portion 54 is formed with the large-diameter portion 54a and the small-diameter portion 54b, so that the three track grooves 56 extending in the axial direction are formed on the inner peripheral surface thereof. Roller guide surfaces 57 are formed on the side walls of each track groove 56 facing each other in the circumferential direction.

トリポード部材５２はボス５８と脚軸５９とを備える。ボス５８にはシャフト６０とトルク伝達可能に結合するスプラインまたはセレーション孔６１が形成してある。脚軸５９はボス５８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５２の各脚軸５９はローラ５３を担持している。   The tripod member 52 includes a boss 58 and a leg shaft 59. The boss 58 is formed with a spline or serration hole 61 that is coupled to the shaft 60 so as to be able to transmit torque. The leg shaft 59 protrudes in the radial direction from the circumferentially divided position of the boss 58. Each leg shaft 59 of the tripod member 52 carries a roller 53.

このようなトリポード型等速自在継手において、作動角をとった状態で回転力を伝達するときには、図９に示すように、ローラ５３とトラック溝５６のローラ案内面５７とが互いに斜交する関係となる。この場合、ローラ５３は図７の矢印で示す方向に転がり移動しようとするのに対して、トラック溝５６は外側継手部材５１の軸線と平行な円筒面の一部であるため、ローラ５３はトラック溝５６に拘束されながら移動することになる。その結果、ローラ案内面５７とローラ５３との相互間に滑りが生じてスライド抵抗が発生し、さらに、この滑りが軸方向に誘起スラストを発生させる。このようなスライド抵抗と誘起スラストは、車体の振動や騒音の発生原因となり、自動車のＮＶＨ性能に影響を与え、車両の足回りの設計自由度を低くするため、できるだけ低減させることが望まれる。   In such a tripod type constant velocity universal joint, when the rotational force is transmitted with the operating angle taken, as shown in FIG. 9, the roller 53 and the roller guide surface 57 of the track groove 56 are obliquely crossed with each other. It becomes. In this case, the roller 53 attempts to roll and move in the direction indicated by the arrow in FIG. 7, whereas the track groove 56 is a part of a cylindrical surface parallel to the axis of the outer joint member 51. It moves while being restrained by the groove 56. As a result, a slip occurs between the roller guide surface 57 and the roller 53 to generate a slide resistance, and this slip generates an induced thrust in the axial direction. Such slide resistance and induced thrust cause vibration and noise of the vehicle body, affect the NVH performance of the automobile, and reduce the degree of freedom in designing the undercarriage of the vehicle.

このようにトリポード型等速自在継手は、回転３次の誘起スラストに起因して、車両のシャダー現象が生じていた。そして、従来では、誘起スラストの低減を図るために、ローラ（転動体）をダブルローラタイプとして、その外ローラの転がり方向をトラック溝に対して一直線に保つものがある（特許文献１及び特許文献２）。 Thus, the tripod type constant velocity universal joint has a vehicle shudder phenomenon due to the third-order induced thrust. Conventionally, in order to reduce induced thrust, a roller (rolling element) is a double roller type, and the rolling direction of the outer roller is kept in a straight line with respect to the track groove (Patent Document 1 and Patent Document). 2).

すなわち、転動体をダブルローラタイプとしたものは、図１０と図１１に示すように、その転動体は、ローラ（外側ローラ）７０と、リング（内側ローラ）７１と、外側ローラ７０と内側ローラ７１との間に介装される複数のニードルころ（針状ころ）７２とを備える。この外側ローラ７０と内側ローラ７１と針状ころ７２等でローラアセンブリを形成している。   That is, when the rolling element is of a double roller type, as shown in FIGS. 10 and 11, the rolling element is composed of a roller (outer roller) 70, a ring (inner roller) 71, an outer roller 70, and an inner roller. And a plurality of needle rollers (needle rollers) 72 interposed therebetween. The outer roller 70, the inner roller 71, the needle rollers 72 and the like form a roller assembly.

そして、トリポード部材５２の脚軸５９の横断面形状を楕円状として、トラック溝長手方向側で前記リング７１の内周面７３との間に隙間７４を形成し前記長手方向と直交するトラック幅方向側で前記リング７１の内周面７３と接触するようにしている。なお、外側ローラ７０の端部内周面に形成した環状溝には、針状ころ７２の抜け止め用のワッシャ７５が装着されている。   Then, the cross-sectional shape of the leg shaft 59 of the tripod member 52 is elliptical, and a gap 74 is formed between the inner circumferential surface 73 of the ring 71 on the track groove longitudinal direction side and perpendicular to the longitudinal direction. It is made to contact with the inner peripheral surface 73 of the ring 71 on the side. A washer 75 for preventing the needle roller 72 from coming off is attached to the annular groove formed on the inner peripheral surface of the end portion of the outer roller 70.

これによって、作動角をとった場合に、ローラアセンブリの転がり方向をトラック溝に対して一直線に保ったまま、トリポード部材は継手軸線に対して傾斜することができる。このため、誘起スラストの低減を達成できる。
特開２０００−２５７６４３号公報 特開２００１−１３２７６６号公報 As a result, when the operating angle is taken, the tripod member can be inclined with respect to the joint axis while keeping the rolling direction of the roller assembly in a straight line with respect to the track groove. For this reason, reduction of induced thrust can be achieved.
Japanese Patent Application Laid-Open No. 2000-257643 JP 2001-132766 A

しかしながら、特許文献１や特許文献２に記載のものでは、無負荷（トルクが作用しない）ときにおいても、ローラアセンブリが脚軸に対して傾くことができる。このため、ローラアセンブリが外側継手部材や脚軸と接触して異音を発生する場合がある。   However, in the ones described in Patent Document 1 and Patent Document 2, the roller assembly can be inclined with respect to the leg shaft even when there is no load (no torque acts). For this reason, the roller assembly may make contact with the outer joint member or the leg shaft to generate abnormal noise.

本発明は、上記課題に鑑みて、誘起スラストを低減して、車両のシャダー現象を低減でき、しかも無負荷状態での異音の発生を防止できる等速自在継手を提供する。   In view of the above problems, the present invention provides a constant velocity universal joint that can reduce induced thrust, reduce a vehicle's shudder phenomenon, and prevent generation of abnormal noise in an unloaded state.

本発明の等速自在継手は、円周方向に向き合って配置されたローラ案内面を有する３つのトラック溝が形成された外側継手部材と、半径方向に突出した３つの脚軸を備えたトリポード部材と、前記トラック溝に挿入されたローラと、前記脚軸に外嵌して前記ローラを回転自在に支持するリングとを備え、前記ローラとリングを含むローラアセンブリが前記ローラ案内面に沿って外側継手部材の軸方向に移動可能な等速自在継手において、前記脚軸を、縦断面においては矩形状とし、かつ、横断面においては、前記トラック溝の長手方向で前記リングの内周面との間に隙間を形成するとともに前記トラック溝の長手方向と直交する幅方向で前記リングの内周面と接触する扁平形状とし、作動角をとった状態では前記ローラアセンブリが前記ローラ案内面に対応したままの脚軸の傾きを許容し、かつ無負荷状態では脚軸に対するローラアセンブリの姿勢を維持する弾性体を、前記隙間に介装したものである。   A constant velocity universal joint according to the present invention is a tripod member including an outer joint member having three track grooves having roller guide surfaces arranged facing each other in the circumferential direction, and three leg shafts projecting in the radial direction. And a roller inserted into the track groove, and a ring that is externally fitted to the leg shaft and rotatably supports the roller, and the roller assembly including the roller and the ring is disposed outside along the roller guide surface. In the constant velocity universal joint movable in the axial direction of the joint member, the leg shaft has a rectangular shape in the longitudinal section, and in the transverse section, the leg shaft has an inner circumferential surface in the longitudinal direction of the track groove. The roller assembly has a flat shape in contact with the inner peripheral surface of the ring in the width direction perpendicular to the longitudinal direction of the track groove, and the roller assembly is in the state where the operating angle is taken. Allowing the inclination of the leg axis that remains corresponding to the guide surface, and an elastic member for maintaining the attitude of the roller assembly relative to the trunnion is in the unloaded condition, is obtained by interposing the gap.

本発明では、作動角をとった状態でローラアセンブリの脚軸に対して傾くことが可能となる。すなわち、脚軸とリングとの間に隙間に弾性体が介装されていても、作動角をとった場合に、この弾性体が弾性変形して、ローラアセンブリが脚軸に対して傾くことを許容する。このため、ローラアセンブリは、外側継手部材のトラック溝に対して平行状態を維持しつつ転動することができる。また、無負荷状態では、弾性体にて脚軸に対するローラアセンブリの姿勢を維持することができる。すなわち、無負荷状態では、弾性体がローラアセンブリと脚軸に対して与圧を与えることができ、ローラアセンブリのバタ（ガタ）つきを防止することができる。ここで、無負荷状態には、作動角をとらない状態（継手軸線に対してトリポード部材２の軸線が傾斜しない状態）と、作動角をとった状態（継手軸線に対してトリポード部材２の軸線が傾斜している状態）とを含む。   In the present invention, it is possible to incline with respect to the leg shaft of the roller assembly in a state where the operating angle is taken. That is, even if an elastic body is interposed in the gap between the leg shaft and the ring, when the operating angle is taken, the elastic body is elastically deformed and the roller assembly is inclined with respect to the leg shaft. Allow. For this reason, the roller assembly can roll while maintaining a parallel state with respect to the track grooves of the outer joint member. In the no-load state, the posture of the roller assembly with respect to the leg shaft can be maintained by the elastic body. That is, in the no-load state, the elastic body can apply pressure to the roller assembly and the leg shaft, and the roller assembly can be prevented from fluttering. Here, in the no-load state, the operating angle is not taken (the axis of the tripod member 2 is not inclined with respect to the joint axis) and the operating angle is taken (the axis of the tripod member 2 with respect to the joint axis). Are inclined).

脚軸の外周面とリングの内周面との接触部側においては、前記弾性体を介在させないようにできる。これにより、リングの脚軸との直接接触部位を確保でき、また、リングが脚軸に対して回転できる範囲を確保できる。   The elastic body can be prevented from interposing on the contact portion side between the outer peripheral surface of the leg shaft and the inner peripheral surface of the ring. Thereby, the direct contact part with the leg axis | shaft of a ring can be ensured, and the range which a ring can rotate with respect to a leg axis | shaft can be ensured.

前記弾性体が、前記リングと脚軸との接触部に浸入する潤滑材を保持するようにできる。これにより、リングと脚軸との接触部の潤滑性能が向上する。   The elastic body may hold a lubricant that enters the contact portion between the ring and the leg shaft. Thereby, the lubrication performance of the contact portion between the ring and the leg shaft is improved.

本発明の等速自在継手は、作動角をとった状態で、ローラアセンブリがローラ案内面に対応したままの脚軸の傾きを許容するので、ローラアセンブリは、外側継手部材のトラック溝に対して平行状態を維持しつつ転動することができる。このため、誘起スラストを低減でき、車両のシャダー現象を抑えることができる。   The constant velocity universal joint according to the present invention allows the inclination of the leg shaft while the roller assembly is in correspondence with the roller guide surface in the state where the operating angle is taken, so that the roller assembly is in contact with the track groove of the outer joint member. It can roll while maintaining a parallel state. For this reason, the induced thrust can be reduced and the vehicle shudder phenomenon can be suppressed.

また、無負荷状態では、弾性体がローラアセンブリと脚軸に対して与圧を与えることができ、ローラアセンブリのバタ（ガタ）つき防止することができる。これにより、静粛な等速自在継手となると共に、長期に亘って等速自在継手の機能を発揮することができる。   Further, in the no-load state, the elastic body can apply pressure to the roller assembly and the leg shaft, and can prevent the roller assembly from fluttering. Thereby, while becoming a quiet constant velocity universal joint, the function of a constant velocity universal joint can be exhibited over a long period of time.

高作動角まで揺動すると、ローラアセンブリは外側継手部材の開口部近傍まで移動することになる。この状態においても、弾性体にて、ローラアセンブリの姿勢を安定させることができるので、ローラアセンブリを滑らかに移動させることができる。このため、高作動角までとったときの継手軸方向スライド抵抗を低減させることができる。   When swinging to a high operating angle, the roller assembly moves to the vicinity of the opening of the outer joint member. Even in this state, since the posture of the roller assembly can be stabilized by the elastic body, the roller assembly can be moved smoothly. For this reason, joint axial direction sliding resistance when it takes to a high operating angle can be reduced.

脚軸の外周面とリングの内周面との接触部側においては、前記弾性体を介在させないようにできる。これにより、リングの脚軸との直接接触部位を確保でき、安定したトルク伝達が可能となる。また、リングが脚軸に対して回転できる範囲を確保でき、ローラ及びリング等で構成するローラアセンブリは滑らかに回転を開始できる。   The elastic body can be prevented from interposing on the contact portion side between the outer peripheral surface of the leg shaft and the inner peripheral surface of the ring. Thereby, a direct contact portion with the leg shaft of the ring can be secured, and stable torque transmission can be achieved. In addition, a range in which the ring can rotate with respect to the leg shaft can be secured, and the roller assembly including the roller and the ring can start to rotate smoothly.

また、前記弾性体が、前記リングと脚軸との間に浸入する潤滑材を保持するようにできるので、リングと脚軸との接触部の潤滑性能が向上して、ローラアセンブリを円滑に回転させることができ、リングと脚軸との接触部における耐摩耗性の点において有利となる。   In addition, since the elastic body can hold the lubricant that enters between the ring and the leg shaft, the lubrication performance of the contact portion between the ring and the leg shaft is improved, and the roller assembly rotates smoothly. This is advantageous in terms of wear resistance at the contact portion between the ring and the leg shaft.

以下本発明の実施の形態を図１〜図６に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

等速自在継手は、図１に示すように、外側継手部材１と、内側継手部材としてのトリポード部材２と、トルク伝達部材としてのローラ３とを備える。   As shown in FIG. 1, the constant velocity universal joint includes an outer joint member 1, a tripod member 2 as an inner joint member, and a roller 3 as a torque transmission member.

外側継手部材１は一体に形成されたマウス部４とステム部１７とからなる。マウス部４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６が形成してある。マウス部４は、横断面で見ると、大径部４ａと小径部４ｂが交互に現れる非円筒形状である。すなわち、マウス部４は、大径部４ａと小径部４ｂとを形成することによって、その内周面に、軸方向に延びる３本の前記トラック溝６が形成される。各トラック溝６の円周方向で向き合った側壁にローラ案内面７、７が形成される。   The outer joint member 1 includes a mouth portion 4 and a stem portion 17 that are integrally formed. The mouse portion 4 has a cup shape opened at one end, and a track groove 6 extending in the axial direction is formed at a position of the inner circumference in three equal parts. The mouse part 4 has a non-cylindrical shape in which the large diameter part 4a and the small diameter part 4b appear alternately when viewed in cross section. That is, the mouse portion 4 is formed with the large-diameter portion 4a and the small-diameter portion 4b, whereby the three track grooves 6 extending in the axial direction are formed on the inner peripheral surface thereof. Roller guide surfaces 7 are formed on the side walls of each track groove 6 facing each other in the circumferential direction.

トリポード部材２はボス８と脚軸９とを備える。ボス８にはシャフト１０とトルク伝達可能に結合するスプラインまたはセレーション孔１1が形成してある。脚軸９はボス８の円周方向三等分位置から半径方向に突出している。   The tripod member 2 includes a boss 8 and a leg shaft 9. The boss 8 is formed with a spline or serration hole 11 connected to the shaft 10 so as to be able to transmit torque. The leg shaft 9 protrudes in the radial direction from the circumferentially divided position of the boss 8.

また、ローラ３はその外径面１３が凸球面とされたリング状体からなり、このローラ３にリング１２が内嵌されている。そして、ローラ３とリング１２とが前記複数のころ５を介してユニット化され、これら等でローラアセンブリ１４を構成している。この場合、ローラ３を外側ローラと呼び、リング１２を内側ローラと呼ぶ。   The roller 3 is a ring-shaped body having an outer diameter surface 13 that is a convex spherical surface, and the ring 12 is fitted inside the roller 3. The roller 3 and the ring 12 are unitized via the plurality of rollers 5, and the roller assembly 14 is configured by these. In this case, the roller 3 is called an outer roller and the ring 12 is called an inner roller.

すなわち、内側ローラ１２は脚軸９の外周面に外嵌している。内側ローラ１２の円筒形外周面を内側軌道面とし、外側ローラ３の円筒形内周面を外側軌道面として、これらの内外軌道面間に針状ころ５が転動自在に介在する。針状ころ５は、できるだけ多くのころを入れた、保持器のない、いわゆる総ころ状態で組み込まれている。なお、外側ローラ３の端部内周面に形成した環状溝には、針状ころ５の抜け止め用のワッシャ１５が装着されている。   That is, the inner roller 12 is fitted on the outer peripheral surface of the leg shaft 9. The cylindrical outer peripheral surface of the inner roller 12 is used as the inner raceway surface, and the cylindrical inner peripheral surface of the outer roller 3 is used as the outer raceway surface, and the needle rollers 5 are movably interposed between these inner and outer raceway surfaces. The needle roller 5 is incorporated in a so-called full roller state in which as many rollers as possible are inserted and no cage is provided. A washer 15 for preventing the needle roller 5 from coming off is attached to the annular groove formed on the inner peripheral surface of the end portion of the outer roller 3.

脚軸９は、図４に示す縦断面で見ると、矩形状であり、図３に示す横断面で見ると、長軸が継手の軸線と直交する扁平形状（略楕円形状）である。脚軸９の横断面形状は、非負荷側すなわちトリポード部材２の軸方向端部側の肉厚を、負荷側に比べて減少させた略楕円形状である。すなわち、脚軸９の横断面形状は、トリポード部材２の軸方向対応部位を、仮想円筒面よりも小径としている。そのような形状の一具体例として略楕円形状が挙げられる。略楕円形状とは、字義通りの楕円形状のほか、一般に卵形、小判形などと称される形状も含まれる。これにより、脚軸９は、継手の軸線と直交する方向（トラック溝６の長手方向に直交する幅方向）で内側ローラ１２の内周面と接触し、継手の軸線方向（トラック溝６の長手方向）で内側ローラ１２の内周面との間に隙間１６、１６を形成する。   The leg shaft 9 has a rectangular shape when viewed in the longitudinal section shown in FIG. 4, and has a flat shape (substantially elliptical shape) whose major axis is orthogonal to the axis of the joint when viewed in the transverse section shown in FIG. 3. The cross-sectional shape of the leg shaft 9 is a substantially elliptical shape in which the thickness on the non-load side, that is, the axial end portion side of the tripod member 2 is reduced compared to the load side. That is, the cross-sectional shape of the leg shaft 9 is such that the portion corresponding to the axial direction of the tripod member 2 has a smaller diameter than the virtual cylindrical surface. A specific example of such a shape is a substantially elliptical shape. The substantially elliptical shape includes a shape generally called an oval shape, an oval shape, etc., in addition to the literally elliptical shape. As a result, the leg shaft 9 contacts the inner peripheral surface of the inner roller 12 in a direction perpendicular to the joint axis (the width direction perpendicular to the longitudinal direction of the track groove 6), and the joint axial direction (the longitudinal direction of the track groove 6). Gaps 16 and 16 are formed between the inner peripheral surface of the inner roller 12 in the direction).

脚軸９の横断面形状が前述のように略楕円形状であり、脚軸９と内側ローラ１２との間には所定の隙間１６、１６が設けてあることから、脚軸９に対して首振り自在である。この場合、前述したように内側ローラ１２と外側ローラ３は針状ころ５を介して相対回転自在にユニット化されているため、このローラアセンブリ１４は脚軸９に対して首振り可能な関係にある。ここで、首振りとは、脚軸９の軸線を含む平面内で、脚軸９の軸線に対してローラアセンブリ１４の軸線が傾くことを意味する（図５参照）。   The cross-sectional shape of the leg shaft 9 is substantially elliptical as described above, and predetermined gaps 16 and 16 are provided between the leg shaft 9 and the inner roller 12. Swing freely. In this case, as described above, the inner roller 12 and the outer roller 3 are unitized so as to be rotatable relative to each other via the needle rollers 5, so that the roller assembly 14 can swing with respect to the leg shaft 9. is there. Here, swinging means that the axis of the roller assembly 14 is inclined with respect to the axis of the leg shaft 9 in a plane including the axis of the leg shaft 9 (see FIG. 5).

前記隙間１６は、図３に示すように、横断面において、三日月形状とされ、脚軸９の外周面と内側ローラ１２の内周面との一方の接触部（接触点）Ｋ１から周方向に沿って順次拡大してこの接触点Ｋ１から周方向に９０度の位置で最大となり、この９０度の位置から周方向に沿って順次縮小して他方の接触部（接触点）Ｋ２に達する。   As shown in FIG. 3, the gap 16 has a crescent shape in the cross section, and extends in a circumferential direction from one contact portion (contact point) K1 between the outer peripheral surface of the leg shaft 9 and the inner peripheral surface of the inner roller 12. The contact point K1 is gradually enlarged along the contact point K1 at a position 90 degrees in the circumferential direction, and the contact point K1 is successively reduced from the 90 degree position along the circumferential direction to reach the other contact part (contact point) K2.

各隙間１６、１６に、例えばスポンジ状のウレタンゴム等のゴム製品からなる弾性体２０を介装している。弾性体２０内部に潤滑材（グリース等）を保持している。また、脚軸９の外周面とリング１２の内周面との接触部Ｋ１、Ｋ２側においては、この弾性体２０を介在させない。すなわち、接触部Ｋ１、Ｋ２と弾性体２０、２０との間に非介在部２１を設けている。この接触部Ｋ１、Ｋ２にトルク（負荷）が作用する。なお、図３における矢印はトルクの作用方向を示している。   An elastic body 20 made of a rubber product such as sponge-like urethane rubber is interposed in each gap 16, 16. A lubricant (such as grease) is held inside the elastic body 20. Further, the elastic body 20 is not interposed on the contact portions K1 and K2 side between the outer peripheral surface of the leg shaft 9 and the inner peripheral surface of the ring 12. That is, the non-intervening part 21 is provided between the contact parts K1 and K2 and the elastic bodies 20 and 20. Torque (load) acts on the contact portions K1, K2. In addition, the arrow in FIG. 3 has shown the action direction of the torque.

このように、弾性体２０、２０を隙間１６、１６に介装することによって、無負荷状態において、脚軸９に対するローラアセンブリ１４の姿勢を維持することができる。すなわち、無負荷状態でローラアセンブリ１４を脚軸９に対してガタつかさせない。無負荷状態には、作動角をとらない状態（継手軸線に対してトリポード部材２の軸線が傾斜しない状態）と、作動角をとった状態（継手軸線に対してトリポード部材２の軸線が傾斜している状態）とを含む。   As described above, the posture of the roller assembly 14 with respect to the leg shaft 9 can be maintained in the no-load state by interposing the elastic bodies 20 and 20 in the gaps 16 and 16. That is, the roller assembly 14 is not rattled with respect to the leg shaft 9 in a no-load state. In the no-load state, the operating angle is not taken (the axis of the tripod member 2 is not inclined with respect to the joint axis) and the operating angle is taken (the axis of the tripod member 2 is inclined with respect to the joint axis). State).

また、脚軸９に対して内側ローラ１２と外側ローラ３がユニットとして首振り可能な関係にあるので、図５と図６に示すように、作動角をとった場合、ローラアセンブリ１４の脚軸９に対して傾くことになる。この際、前記弾性体２０は弾性変形して、この傾きを許容する。このため、この弾性体２０を介装していても、作動角をとった状態で、ローラアセンブリ１４がローラ案内面７に対応したままの脚軸９の傾きを許容するので、ローラアセンブリ１４は、外側継手部材１のトラック溝６に対して平行状態を維持しつつ転動することができる。なお、作動角をとった状態から作動角をとらない状態に戻った際には、弾性体２０はその復元力にて、図４等に示す状態に戻る。   Further, since the inner roller 12 and the outer roller 3 are swingable as a unit with respect to the leg shaft 9, as shown in FIGS. 5 and 6, when the operating angle is taken, the leg shaft of the roller assembly 14 is taken. Will be inclined to 9. At this time, the elastic body 20 is elastically deformed to allow the inclination. For this reason, even if the elastic body 20 is interposed, the roller assembly 14 allows the inclination of the leg shaft 9 while keeping the roller guide surface 7 in a state where the operating angle is taken. The outer joint member 1 can roll while maintaining a parallel state with respect to the track groove 6. In addition, when returning to the state which does not take an operating angle from the state which took the operating angle, the elastic body 20 returns to the state shown in FIG.4 etc. with the restoring force.

本発明の等速自在継手では、無負荷状態ではローラアセンブリ１４の脚軸９に対する姿勢を弾性体２０にて維持することができる。すなわち、無負荷状態では、弾性体２０がローラアセンブリ１４と脚軸９に対して与圧を与えることができ、ローラアセンブリ１４のバタ（ガタ）つきを防止することができる。このため、ローラ３と外側継手部材１との接触による異音の発生、リング１２と脚軸９との接触による異音の発生を防止することができ、静粛な等速自在継手となると共に、長期に亘って等速自在継手の機能を発揮することができる。しかも、作動角をとった場合にも、ローラアセンブリ１４は、外側継手部材１のトラック溝６に対して平行状態を維持しつつ転動することができるので、誘起スラストを低減でき、車両のシャダー現象を抑えることができる。   In the constant velocity universal joint of the present invention, the posture of the roller assembly 14 with respect to the leg shaft 9 can be maintained by the elastic body 20 in a no-load state. That is, in the no-load state, the elastic body 20 can apply pressure to the roller assembly 14 and the leg shaft 9, and the roller assembly 14 can be prevented from fluttering. For this reason, generation | occurrence | production of the noise by contact with the roller 3 and the outer joint member 1, and generation | occurrence | production of the noise by the contact with the ring 12 and the leg shaft 9 can be prevented, and it becomes a quiet constant velocity universal joint, The function of the constant velocity universal joint can be exhibited over a long period of time. Moreover, since the roller assembly 14 can roll while maintaining a parallel state with respect to the track groove 6 of the outer joint member 1 even when the operating angle is taken, the induced thrust can be reduced, and the vehicle's shudder can be reduced. The phenomenon can be suppressed.

高作動角まで揺動すると、ローラアセンブリ１４は外側継手部材１の開口部近傍まで移動することになるが、この状態においても、弾性体２０にて、ローラアセンブリ１４の姿勢を安定させることができるので、ローラアセンブリ１４を滑らかに移動させることができる。このため、高作動角までとったときの継手軸方向スライド抵抗を低減させることができる。   When the roller assembly 14 swings to a high operating angle, the roller assembly 14 moves to the vicinity of the opening of the outer joint member 1. Even in this state, the posture of the roller assembly 14 can be stabilized by the elastic body 20. Therefore, the roller assembly 14 can be moved smoothly. For this reason, joint axial direction sliding resistance when it takes to a high operating angle can be reduced.

脚軸９の外周面とリング１２の内周面との接触部側においては、前記弾性体２０を介在させないようにできる。これにより、リング１２の脚軸９との直接接触部位を確保でき、安定したトルク伝達が可能となる。また、リング１２が脚軸９に対して回転できる範囲を確保でき、ローラ３及びリング１２等で構成するローラアセンブリ１４は滑らかに回転を開始できる。   The elastic body 20 can be prevented from interposing on the contact portion side between the outer peripheral surface of the leg shaft 9 and the inner peripheral surface of the ring 12. Thereby, the direct contact site | part with the leg axis 9 of the ring 12 can be ensured, and the stable torque transmission is attained. In addition, a range in which the ring 12 can rotate with respect to the leg shaft 9 can be secured, and the roller assembly 14 including the roller 3 and the ring 12 can be smoothly rotated.

また、前記弾性体２０が、前記リング１２と脚軸９との間に浸入する潤滑材を保持するようにできるので、リング１２と脚軸９との接触部の潤滑性能が向上して、ローラアセンブリ１４を円滑に回転させることができ、リング１２と脚軸９との接触部における耐摩耗性の点において有利となる。   Further, since the elastic body 20 can hold the lubricant that enters between the ring 12 and the leg shaft 9, the lubrication performance of the contact portion between the ring 12 and the leg shaft 9 is improved, and the roller The assembly 14 can be smoothly rotated, which is advantageous in terms of wear resistance at the contact portion between the ring 12 and the leg shaft 9.

以上、本発明の実施形態につき説明したが、本発明は前記実施形態に限定されることなく種々の変形が可能であって、例えば、弾性体２０に潤滑材を保持させる方法としては、封入であっても吸着であってもよい。すなわち、潤滑材がリング１２と脚軸９との間に浸入できればよい。また、潤滑材の材質として、弾性体２０にて保持することができて潤滑性を奏することができるものであれば使用できる。さらに、弾性体２０としては全隙間１６に介装するものであってもよい。なお、弾性体２０を介装する場合、脚軸９側に弾性体２０を接着しても、逆にリング１２側に弾性体２０を接着してもよく、どちらにも接着させることなく、隙間１６に単に介装するものであってもよい。   As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, as a method for holding the lubricant in the elastic body 20, encapsulation is possible. It may be adsorption. That is, it is only necessary that the lubricant can enter between the ring 12 and the leg shaft 9. Further, any material that can be held by the elastic body 20 and exhibit lubricity can be used as the material of the lubricant. Furthermore, the elastic body 20 may be interposed in the entire gap 16. When the elastic body 20 is interposed, the elastic body 20 may be bonded to the leg shaft 9 side, or conversely, the elastic body 20 may be bonded to the ring 12 side. 16 may be simply interposed.

本発明の実施形態を示す等速自在継手の縦断面図である。It is a longitudinal cross-sectional view of the constant velocity universal joint which shows embodiment of this invention. 前記等速自在継手の横断面図である。It is a cross-sectional view of the constant velocity universal joint. 前記等速自在継手のローラアセンブリの簡略平面図である。It is a simplified top view of the roller assembly of the constant velocity universal joint. 前記等速自在継手のローラアセンブリの断面図である。It is sectional drawing of the roller assembly of the said constant velocity universal joint. 前記等速自在継手の作動角をとった状態の縦断面図である。It is a longitudinal cross-sectional view of the state where the operating angle of the constant velocity universal joint is taken. 前記等速自在継手の作動角をとった状態のローラアセンブリの断面図である。It is sectional drawing of the roller assembly of the state which took the operating angle of the said constant velocity universal joint. 従来の等速自在継手の縦断面図である。It is a longitudinal cross-sectional view of the conventional constant velocity universal joint. 従来の等速自在継手の横断面図である。It is a cross-sectional view of a conventional constant velocity universal joint. 従来の等速自在継手のローラとトラック溝との関係を示す簡略斜視図である。It is a simple perspective view which shows the relationship between the roller and track groove of the conventional constant velocity universal joint. 従来の等速自在継手のローラアセンブリの簡略平面図である。It is a simplified top view of the roller assembly of the conventional constant velocity universal joint. 従来の等速自在継手のローラアセンブリの断面図である。It is sectional drawing of the roller assembly of the conventional constant velocity universal joint.

符号の説明Explanation of symbols

１ 外側継手部材
２ トリポード部材
３ ローラ
６ トラック溝
７ ローラ案内面
９ 脚軸
１２ リング
１４ ローラアセンブリ
１６ 隙間
２０ 弾性体 Reference Signs List 1 outer joint member 2 tripod member 3 roller 6 track groove 7 roller guide surface 9 leg shaft 12 ring 14 roller assembly 16 gap 20 elastic body

Claims (3)

円周方向に向き合って配置されたローラ案内面を有する３つのトラック溝が形成された外側継手部材と、半径方向に突出した３つの脚軸を備えたトリポード部材と、前記トラック溝に挿入されたローラと、前記脚軸に外嵌して前記ローラを回転自在に支持するリングとを備え、前記ローラ及びリングを含むローラアセンブリが前記ローラ案内面に沿って外側継手部材の軸方向に移動可能な等速自在継手において、
前記脚軸を、縦断面においては矩形状とし、かつ、横断面においては、前記トラック溝の長手方向で前記リングの内周面との間に隙間を形成するとともに前記トラック溝の長手方向と直交する幅方向で前記リングの内周面と接触する扁平形状とし、作動角をとった状態では前記ローラアセンブリが前記ローラ案内面に対応したままの脚軸の傾きを許容し、かつ無負荷状態では脚軸に対するローラアセンブリの姿勢を維持する弾性体を、前記隙間に介装したことを特徴とする等速自在継手。 An outer joint member formed with three track grooves having roller guide surfaces arranged facing each other in the circumferential direction, a tripod member having three leg shafts projecting in the radial direction, and inserted into the track groove A roller and a ring that is externally fitted to the leg shaft and rotatably supports the roller, and the roller assembly including the roller and the ring is movable in the axial direction of the outer joint member along the roller guide surface. In constant velocity universal joints,
The leg shaft has a rectangular shape in the longitudinal section, and in the transverse section, a gap is formed between the longitudinal direction of the track groove and the inner peripheral surface of the ring and is orthogonal to the longitudinal direction of the track groove. In a state where the roller assembly has a flat shape in contact with the inner peripheral surface of the ring in the width direction, the roller assembly allows the inclination of the leg shaft to correspond to the roller guide surface when the operating angle is taken, and in the no-load state A constant velocity universal joint characterized in that an elastic body that maintains the posture of the roller assembly with respect to the leg shaft is interposed in the gap. 脚軸の外周面とリングの内周面との接触部側においては、前記弾性体を介在させないことを特徴とする請求項１の等速自在継手。   2. The constant velocity universal joint according to claim 1, wherein the elastic body is not interposed on a contact portion side between the outer peripheral surface of the leg shaft and the inner peripheral surface of the ring. 前記弾性体が、前記リングと脚軸との間に浸入する潤滑材を保持することを特徴とする請求項１又は請求項２の等速自在継手。   The constant velocity universal joint according to claim 1, wherein the elastic body holds a lubricant that enters between the ring and the leg shaft.
JP2006029561A 2006-02-07 2006-02-07 Constant velocity universal joint Withdrawn JP2007211804A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009138908A (en) * 2007-12-10 2009-06-25 Ntn Corp Constant velocity universal joint

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009138908A (en) * 2007-12-10 2009-06-25 Ntn Corp Constant velocity universal joint

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