JP2009228809A - Constant velocity universal joint - Google Patents

Constant velocity universal joint Download PDF

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Publication number
JP2009228809A
JP2009228809A JP2008075493A JP2008075493A JP2009228809A JP 2009228809 A JP2009228809 A JP 2009228809A JP 2008075493 A JP2008075493 A JP 2008075493A JP 2008075493 A JP2008075493 A JP 2008075493A JP 2009228809 A JP2009228809 A JP 2009228809A
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Prior art keywords
joint member
constant velocity
velocity universal
universal joint
diameter surface
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JP2008075493A
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Japanese (ja)
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Tetsuo Kadota
哲郎 門田
Toru Yamase
徹 山瀬
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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
    • F16D3/22—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 the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—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 the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D3/226—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 the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines in each coupling part lying on a cylinder co-axial with the respective coupling part
    • F16D3/227—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 the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines in each coupling part lying on a cylinder co-axial with the respective coupling part the joints being telescopic
    • 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
    • F16D3/22—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 the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—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 the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D3/2237—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 the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts where the grooves are composed of radii and adjoining straight lines, i.e. undercut free [UF] type joints

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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 having excellent workability and durability without providing such a hooking portion that damages a cage in the outer ring inner diameter surface even when continuing rotation in the case where large torque is applied at a large operating angle. <P>SOLUTION: An inner diameter surface 21 between track grooves of the outer joint member is brought in contact with the outer diameter surface 28a of the cage 28 at least at the intermediate portion 21a between the track grooves, and has a non-circular shape so as to form a gap between the outer diameter surface 28a of the cage 28 at the track groove side. The inner diameter surface 21 of the outer joint member is subjected to cutting of hardened steel after quenched. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、自動車や各種産業機械の動力伝達系等において使用される等速自在継手に関する。   The present invention relates to a constant velocity universal joint used in power transmission systems of automobiles and various industrial machines.

等速自在継手には、角度変位のみを許容する固定式等速自在継手と、角度変位のみならず軸方向変位も許容する摺動式等速自在継手とがある。固定式等速自在継手には、バーフィールド型（ＢＪ）（例えば特許文献１）やアンダーカットフリー型（ＵＪ）等があり、摺動式等速自在継手には、ダブルオフセット型等速自在継手（ＤＯＪ）（例えば、特許文献２）やクロスグルーブ型等速自在継手（ＬＪ）（例えば、特許文献５、６）等がある。また、固定式等速自在継手には、高角使用時における耐久性を好適に維持するため、円弧部と複数の直線部とを有するトラック溝を備えたもの（特許文献３）、さらには、カウンタートラックジョイント（特許文献４）等がある。   The constant velocity universal joint includes a fixed type constant velocity universal joint that allows only angular displacement and a sliding type constant velocity universal joint that allows not only angular displacement but also axial displacement. Fixed constant velocity universal joints include Barfield type (BJ) (for example, Patent Document 1) and undercut free type (UJ). Sliding constant velocity universal joints include double offset type constant velocity universal joints. (DOJ) (for example, Patent Document 2) and cross groove type constant velocity universal joint (LJ) (for example, Patent Documents 5 and 6). In addition, the fixed type constant velocity universal joint is provided with a track groove having an arc portion and a plurality of straight portions in order to suitably maintain durability at the time of high angle use (Patent Document 3), and further, a counter There is a track joint (Patent Document 4).

ＢＪタイプの固定式等速自在継手は、図７に示すように、内球面１に複数のトラック溝２が円周方向等間隔に軸方向に沿って形成された外側継手部材としての外輪３と、外球面４に外輪３のトラック溝２と対をなす複数のトラック溝５が円周方向等間隔に軸方向に沿って形成された内側継手部材としての内輪６と、外輪３のトラック溝２と内輪６のトラック溝５との間に介在してトルクを伝達する複数のボール７と、外輪３の内球面１と内輪６の外球面４との間に介在してボール７を保持するケージ８とを備えている。ケージ８には、ボール７が収容される窓部９が周方向に沿って複数配設されている。   As shown in FIG. 7, the BJ type fixed type constant velocity universal joint includes an outer ring 3 as an outer joint member in which a plurality of track grooves 2 are formed in the inner spherical surface 1 along the axial direction at equal intervals in the circumferential direction. A plurality of track grooves 5 paired with the track grooves 2 of the outer ring 3 are formed on the outer spherical surface 4 along the axial direction at equal intervals in the circumferential direction, and the track groove 2 of the outer ring 3 as an inner joint member. Between the inner ring 6 and the track groove 5 of the inner ring 6 for transmitting torque, and a cage for holding the balls 7 interposed between the inner spherical surface 1 of the outer ring 3 and the outer spherical surface 4 of the inner ring 6. 8 and. A plurality of window portions 9 in which the balls 7 are accommodated are arranged in the cage 8 along the circumferential direction.

ケージ８は外輪３の内球面及び内輪６の外球面とそれぞれ球面接触している。外輪３と内輪６のトラック溝２，５のボール中心軌跡線の曲率中心（Ｏ１，Ｏ２）はそれぞれ継手中心Ｏに対して対称な位置にある。言い換えれば、曲率中心Ｏ１と曲率中心Ｏ２は継手中心Ｏから互いに逆方向に等距離、軸方向にオフセットしている。このため、外輪３のトラック溝２と内輪６のトラック溝５とで形成されるトラックは、軸方向の一方から他方へ向かって徐々に広がったくさび形状を呈する。各ボール７はこのくさび状のトラック内に収容され、外輪３と内輪６との間でトルクを伝達する。すべてのボール７を継手平面（作動角の二等分線に垂直な平面）に保持するためケージ８が組み込まれている。   The cage 8 is in spherical contact with the inner spherical surface of the outer ring 3 and the outer spherical surface of the inner ring 6. The centers of curvature (O1, O2) of the ball center locus lines of the track grooves 2 and 5 of the outer ring 3 and the inner ring 6 are respectively symmetrical with respect to the joint center O. In other words, the center of curvature O1 and the center of curvature O2 are offset from the joint center O by an equal distance in the opposite direction and offset in the axial direction. For this reason, the track formed by the track groove 2 of the outer ring 3 and the track groove 5 of the inner ring 6 has a wedge shape that gradually spreads from one to the other in the axial direction. Each ball 7 is accommodated in this wedge-shaped track and transmits torque between the outer ring 3 and the inner ring 6. A cage 8 is incorporated to hold all the balls 7 in the joint plane (plane perpendicular to the bisector of the operating angle).

トラック溝２，５にオフセットが付与されているため、固定式等速自在継手が作動角を取った状態でトルクを伝達するとき、ボール７に軸力が作用し、その結果ボール７は、トラック溝２，５の開口している方向、つまり、上記くさび形状トラック空間の広がった方向に飛び出そうとする。それに伴いケージ８にも軸力が作用し、ケージ８は外輪３の内球面と内輪６の外球面に強く押し当てられる。ボール７に作用する軸力は、トルクと作動角が増加するほど大きくなる特性を有する。したがって、トルクを伝達しながら継手が作動するためには、ケージ８は十分な強度が必要であり、外輪３および内輪６と接触しながら滑り運動するため、ケージ８は十分な耐磨耗性と耐熱性も具備する必要がある。また、継手平面にボールを確実に保持するため、ボール７はケージ８のポケット内に圧入されることが多く、この圧入面内でボール７は運動し、そのため、発熱とケージ８の摩耗を伴う。以上のように、ケージ８は十分な強度、耐熱性と耐摩耗性が必要である。   Since the track grooves 2 and 5 are offset, when the torque is transmitted with the fixed type constant velocity universal joint taking an operating angle, an axial force acts on the ball 7, and as a result, the ball 7 It tries to jump out in the direction in which the grooves 2 and 5 are opened, that is, in the direction in which the wedge-shaped track space is widened. Along with this, axial force also acts on the cage 8, and the cage 8 is strongly pressed against the inner spherical surface of the outer ring 3 and the outer spherical surface of the inner ring 6. The axial force acting on the ball 7 has a characteristic that it increases as the torque and the operating angle increase. Therefore, in order for the joint to operate while transmitting torque, the cage 8 needs to have sufficient strength, and since the sliding motion while contacting the outer ring 3 and the inner ring 6, the cage 8 has sufficient wear resistance. It must also have heat resistance. Further, in order to securely hold the ball on the joint plane, the ball 7 is often press-fitted into the pocket of the cage 8, and the ball 7 moves within the press-fitting surface, and thus heat generation and wear of the cage 8 are involved. . As described above, the cage 8 needs to have sufficient strength, heat resistance, and wear resistance.

また、固定式自在継手では、トラック溝２、５はオフセットを有するため、トラック溝２、５の深さは軸方向で均一ではない。それゆえ、トラック溝２，５の浅いところでボールが高負荷を伝達する時、ボール７の接触楕円が大きくなり、応力が集中するトラック溝肩部に接触楕円が乗り上げ、肩部に盛り上がりが生ずるおそれがある。これの対策として、ボール７の径やピッチ円直径を大きくして面圧を低下させることが考えられるが、外輪の外径が増加して継手が大きくなるという不具合が生じる。また、オフセット量を小さくすれば、当然トラック溝深さは軸方向でより均一になるが、作動性が低下するという問題が残り、得策ではない。ゲージ８の肉厚を薄くすればトラック溝２、５は深くなるが、ケージ８の強度が低下する。このように、通常、ケージ８の肉厚とトラック溝２、５の深さは互いに取り合いする関係にある。   In the fixed universal joint, since the track grooves 2 and 5 have an offset, the depth of the track grooves 2 and 5 is not uniform in the axial direction. Therefore, when the ball transmits a high load at a shallow depth in the track grooves 2 and 5, the contact ellipse of the ball 7 becomes large, and the contact ellipse rides on the shoulder of the track groove where stress is concentrated, and the shoulder may be raised. There is. As a countermeasure against this, it is conceivable to increase the diameter of the ball 7 or the pitch circle diameter to reduce the surface pressure. However, there arises a problem that the outer diameter of the outer ring increases and the joint becomes larger. Further, if the offset amount is reduced, the track groove depth is naturally made more uniform in the axial direction, but the problem of reduced operability remains, which is not a good idea. If the thickness of the gauge 8 is reduced, the track grooves 2 and 5 become deeper, but the strength of the cage 8 decreases. As described above, the thickness of the cage 8 and the depth of the track grooves 2 and 5 are normally in a relationship with each other.

また、ＤＯＪタイプの摺動式等速自在継手は、軸方向に延びる複数の直線状トラック溝が円筒状内周面に形成された外側継手部材と、その外側継手部材のトラック溝と対をなして軸方向に延びる直線状トラック溝が球面状外周面に形成された内側継手部材と、外側継手部材のトラック溝と内側継手部材のトラック溝との間に介在してトルクを伝達する複数のボールと、外側継手部材の円筒状内周面と内側継手部材の球面状外周面との間に介在してボールを保持するケージとを主要な構成要素として備えている。
特開２０００−１０４７４９ 特開２００３−１７６８３３ 特開２００４−１５６６９９ 特表２００４−５１８０８３ ＥＰ１５４１８８５Ａ１ ＵＳ４６７８４５３ The DOJ-type sliding constant velocity universal joint is paired with an outer joint member in which a plurality of linear track grooves extending in the axial direction are formed on a cylindrical inner peripheral surface, and a track groove of the outer joint member. A plurality of balls that transmit torque by being interposed between the track groove of the outer joint member and the track groove of the inner joint member. And a cage for holding the ball interposed between the cylindrical inner peripheral surface of the outer joint member and the spherical outer peripheral surface of the inner joint member.
JP 2000-104749 A JP2003-176833 JP 2004-156699 A Special table 2004-518083 EP1541885A1 US4678453

図７に示すような等速自在継手において、大きな作動角で大きなトルクが負荷された場合に回転が継続されると、前述のように、ボール７とトラック溝２との接触楕円（トラック溝とボールとの接触により形成される楕円形状の接触面）が外輪３のトラック溝２から外れ、エッジロード状態となるおそれがある。エッジロードにより、外輪３の内径面（内球面）のトラック溝エッジ部Ｅ（図８参照）に盛り上がりが生じることがある。   In the constant velocity universal joint as shown in FIG. 7, when rotation is continued when a large torque is applied at a large operating angle, as described above, the contact ellipse between the ball 7 and the track groove 2 (track groove and There is a possibility that an elliptical contact surface formed by contact with the ball will come off from the track groove 2 of the outer ring 3 and be in an edge load state. Due to the edge load, the track groove edge portion E (see FIG. 8) of the inner diameter surface (inner spherical surface) of the outer ring 3 may be raised.

このような盛り上がりが生じれば、その盛り上がり部がケージ８の外球面８ａに局部的な摩擦を増加させ発熱を増加させたり、さらにはその盛り上がり部が、ケージの外球面上のケージポケット９との角部に引っ掛かり、その盛り上がり部自体が欠けたり、あるいはケージ８を損傷（破損）させることになる。   If such a bulge occurs, the bulge increases the local friction on the outer spherical surface 8a of the cage 8 to increase heat generation. Further, the bulged portion is connected to the cage pocket 9 on the outer spherical surface of the cage. The raised portion itself is missing or the cage 8 is damaged (broken).

他の固定式等速自在継手であっても、ダブルオフセット型等速自在継手（ＤＯＪ）等の摺動式等速自在継手であっても、このように、外輪の内径面に盛り上がりが生じるおそれがある。   Whether it is another fixed type constant velocity universal joint or a sliding type constant velocity universal joint such as a double offset type constant velocity universal joint (DOJ), the inner ring surface of the outer ring may be swelled in this way. There is.

本発明は、上記課題に鑑みて、大きな作動角で大きなトルクが負荷された場合に回転が継続されても、ケージに局部的な摩擦・発熱を増大させたり、さらには損傷（破損）させるような、外輪内径面の引っ掛かり部が生じることなく、作動性及び耐久性に優れた等速自在継手を提供する。   In view of the above problems, the present invention is intended to increase local friction and heat generation, or even damage (break) the cage even when rotation is continued when a large torque is applied at a large operating angle. A constant velocity universal joint excellent in operability and durability is provided without the occurrence of a catching portion on the inner surface of the outer ring.

本発明の第１の等速自在継手は、内径面に複数のトラック溝が形成された外側継手部材と、外径面に複数のトラック溝が形成された内側継手部材と、前記外側継手部材のトラック溝と内側継手部材のトラック溝との間に介在してトルクを伝達する複数のボールと、前記外側継手部材と内側継手部材との間に介在してボールを保持するケージとを備えた等速自在継手であって、外側継手部材の内径面が焼入れ後に切削を行う焼入鋼切削してなるとともに、外側継手部材のトラック溝間の内径面を、少なくともトラック溝間の中間部がケージの外径面と接触するとともにトラック溝側においてケージの外径面との間に隙間を形成する非円形形状としたものである。焼入鋼切削は、単に切削のことであり、切削は通常生材の状態で行うので、熱処理後（焼入れ後）の切削であることを明確にするために焼入鋼切削と称した。   A first constant velocity universal joint of the present invention includes an outer joint member having a plurality of track grooves formed on an inner diameter surface, an inner joint member having a plurality of track grooves formed on an outer diameter surface, and the outer joint member. Provided with a plurality of balls that transmit torque by being interposed between the track grooves and the track grooves of the inner joint member, and a cage that is interposed between the outer joint member and the inner joint member to hold the balls. This is a quick universal joint, and the inner surface of the outer joint member is cut by quenching steel, which is cut after quenching, and the inner surface between the track grooves of the outer joint member is at least the intermediate portion between the track grooves. A non-circular shape is formed in contact with the outer diameter surface and forming a gap with the outer diameter surface of the cage on the track groove side. Hardened steel cutting is simply cutting, and since cutting is usually performed in the state of raw material, it was referred to as hardened steel cutting in order to clarify that the cutting was after heat treatment (after quenching).

本発明の等速自在継手では、外側継手部材の内径面において、トラック溝側においてケージの外径面との間に隙間を形成するので、大きな作動角で大きなトルクが負荷された場合に回転が継続されて、外側継手部材の内径面（内球面）のトラック溝エッジ部に盛り上がり部が形成されても、この盛り上がり部が隙間に吸収される。このため、この盛り上がり部がケージの外径面に干渉することを防止することができる。   In the constant velocity universal joint of the present invention, a gap is formed between the inner diameter surface of the outer joint member and the outer diameter surface of the cage on the track groove side, so that rotation is performed when a large torque is applied at a large operating angle. Even if the raised portion is formed at the track groove edge portion of the inner diameter surface (inner spherical surface) of the outer joint member, the raised portion is absorbed by the gap. For this reason, it can prevent that this bulging part interferes with the outer-diameter surface of a cage.

本発明の等速自在継手は、角度変位のみを許容する固定式であっても、角度変位及び軸方向変位を許容する摺動式であってもよい。   The constant velocity universal joint of the present invention may be a fixed type that allows only angular displacement or a sliding type that allows angular displacement and axial displacement.

外側継手部材の中心軸線に直交する断面において、前記隙間はトラック溝間の中間部からトラック溝に向かって拡大するのが好ましい。この隙間によって、エッジロードによる外輪内径面（外輪の内径面のトラック溝エッジ部）に生じる盛り上がり部を安定して吸収することができる。   In the cross section orthogonal to the central axis of the outer joint member, the gap preferably expands from the intermediate portion between the track grooves toward the track groove. By this gap, it is possible to stably absorb the raised portion generated on the inner surface of the outer ring by the edge load (the track groove edge portion of the inner surface of the outer ring).

前記内側継手部材及び外側継手部材のトラック溝ボール中心軌跡線が単一の円弧部からなるものであったり、複数の円弧部からなるものであったり、円弧部とストレート部とを備えたものであったりする。さらには、外側継手部材及び内側継手部材の円周方向に隣り合うトラック溝の向きを交互に対称となるように配置したものであってもよい。   The track groove ball center locus line of the inner joint member and the outer joint member consists of a single arc portion, a plurality of arc portions, or an arc portion and a straight portion. There is. Further, the outer joint member and the inner joint member may be arranged so that the directions of the track grooves adjacent to each other in the circumferential direction are alternately symmetrical.

本発明では、外側継手部材の内径面に盛り上がりが生じても、ケージの外径面と外側継手部材の内径面との間に形成される隙間にこの盛り上がりが吸収される。このため、この盛り上がり部がケージの外径面に干渉することを防止することができ、ケージの損傷を回避することができる。しかも、この隙間によってケージの外径面と外側継手部材の内径面との間へのグリースの介入性が向上し、作動性及び耐久性に優れる等速自在継手となる。   In the present invention, even if a bulge occurs on the inner diameter surface of the outer joint member, the bulge is absorbed by the gap formed between the outer diameter surface of the cage and the inner diameter surface of the outer joint member. For this reason, it can prevent that this bulging part interferes with the outer diameter surface of a cage, and damage to a cage can be avoided. Moreover, the gap improves the intervening property of the grease between the outer diameter surface of the cage and the inner diameter surface of the outer joint member, so that a constant velocity universal joint excellent in operability and durability is obtained.

外側継手部材の内径面が焼入れ後に切削を行う焼入鋼切削してなるので、外側継手部材の内径面においては、仕上げに研削加工を行う必要がなくなる。このため、環境上好ましくない研削クーラントの使用を控えることができ、環境にやさしい加工が可能であって、しかも低コスト化を図ることができる。硬化層が形成された部位が耐摩耗性、耐寿命性等に優れ、高品質の等速自在継手となる。   Since the inner surface of the outer joint member is cut by quenching steel that performs cutting after quenching, the inner surface of the outer joint member does not need to be ground for finishing. For this reason, it is possible to refrain from using environmentally unfavorable grinding coolant, enabling environmentally friendly processing and reducing costs. The portion where the hardened layer is formed is excellent in wear resistance, life resistance and the like, and becomes a high-quality constant velocity universal joint.

隙間がトラック溝間の中間部からトラック溝に向かって拡大するものであれば、この隙間によって、エッジロードによる外輪内径面に生じる盛り上がり部を安定して吸収することができ、ケージへの損傷防止機能が安定する。しかも、隙間形成のための加工は、旋盤において、加工物（外輪）のトラック溝位置の回転位相と同期して、工具の突き出し位置を、カム又は数値制御により制御することにより、可能であり、生産性の向上を図ることができる。   If the gap expands from the middle part between the track grooves toward the track groove, the gap can stably absorb the bulging part generated on the inner surface of the outer ring due to the edge load, and prevent damage to the cage. Function is stable. Moreover, the machining for forming the gap is possible by controlling the protruding position of the tool by a cam or numerical control in a lathe in synchronization with the rotational phase of the track groove position of the workpiece (outer ring). Productivity can be improved.

等速自在継手としては、固定式であっても摺動式であってもよく、特に固定式である場合に、内側継手部材および外側継手部材のトラック溝ボール中心軌跡線が円弧部とストレート部とを備えたものであれば、継手作動角の高角化を図ることができる。特に、トラック溝ボール中心軌跡線が円弧部とテーパ部とを備えたものであれば、より一層の高角化が可能である。   The constant velocity universal joint may be a fixed type or a sliding type. In particular, in the case of the fixed type, the track groove ball center locus line of the inner joint member and the outer joint member is an arc portion and a straight portion. The joint operating angle can be increased. In particular, if the track groove ball center locus line has an arc portion and a tapered portion, the angle can be further increased.

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.

この等速自在継手は、図１に示すように内径面（内球面）２１に複数（例えば６個）のトラック溝２２が軸方向に沿って形成された外側継手部材としての外輪２３と、外径面（外球面）２４に外輪２３のトラック溝２２と対をなす複数（例えば６個）のトラック溝２５が軸方向に沿って形成された内側継手部材としての内輪２６と、外輪２３のトラック溝２２と内輪２６のトラック溝２５との間に介在してトルクを伝達する複数（６個）のボール２７と、外輪２３の内球面２１と内輪２６の外球面２４との間に介在してボール２７を保持する窓部２９を有するケージ２８とを備えている。この場合、窓部２９は円周方向に沿って等ピッチ（例えば６０°ピッチ）で６個配設されている。この図１の等速自在継手は、バーフィールド型（ＢＪ）の固定式等速自在継手である。   As shown in FIG. 1, the constant velocity universal joint includes an outer ring 23 as an outer joint member in which a plurality of (for example, six) track grooves 22 are formed on an inner diameter surface (inner spherical surface) 21 along the axial direction, An inner ring 26 as an inner joint member in which a plurality of (for example, six) track grooves 25 that are paired with the track grooves 22 of the outer ring 23 are formed in the radial surface (outer spherical surface) 24 along the axial direction, and the track of the outer ring 23 A plurality of (six) balls 27 that are interposed between the groove 22 and the track groove 25 of the inner ring 26 and transmit torque, and are interposed between the inner spherical surface 21 of the outer ring 23 and the outer spherical surface 24 of the inner ring 26. And a cage 28 having a window 29 for holding the ball 27. In this case, six window portions 29 are arranged at an equal pitch (for example, 60 ° pitch) along the circumferential direction. The constant velocity universal joint of FIG. 1 is a Barfield type (BJ) fixed type constant velocity universal joint.

この固定式等速自在継手では、大きな作動角を取り得る構造とするため、外輪２３のトラック溝２２の曲率中心Ｏ１と内輪２６のトラック溝２５の曲率中心Ｏ２とを、ボール中心を含む継手中心Ｏに対して等距離ｆだけ軸方向に逆向きにオフセットさせている。このようにトラックオフセットを設けたことにより、両トラック溝２２，２５のそれぞれは、その軸方向中央から外輪底側で浅く、外輪開口側で深くなっており、その結果、外輪２３の底側から開口側へ向けて径方向間隔が徐々に増加する楔状のボールトラックが形成されている。   Since this fixed type constant velocity universal joint has a structure capable of taking a large operating angle, the center of curvature O1 of the track groove 22 of the outer ring 23 and the center of curvature O2 of the track groove 25 of the inner ring 26 are the center of the joint including the ball center. The offset is offset in the axial direction by an equal distance f with respect to O. By providing the track offset in this way, each of the track grooves 22 and 25 is shallow from the axial center to the outer ring bottom side and deep from the outer ring opening side, and as a result, from the bottom side of the outer ring 23. A wedge-shaped ball track in which the radial interval gradually increases toward the opening side is formed.

外輪２３の内径面には硬化層が形成され、この硬化層は焼入れ後に切削を行う焼入鋼切削されてなる。焼入鋼切削は、単に切削のことであり、切削は通常生材の状態で行うので、熱処理後（焼入れ後）の切削であることを明確にするために焼入鋼切削と称した。焼き入れ後に切削を行うため、素材の熱処理変形をこの切削過程で除去することができる。   A hardened layer is formed on the inner diameter surface of the outer ring 23, and this hardened layer is formed by cutting hardened steel that performs cutting after quenching. Hardened steel cutting is simply cutting, and since cutting is usually performed in the state of raw material, it was referred to as hardened steel cutting in order to clarify that the cutting was after heat treatment (after quenching). Since cutting is performed after quenching, the heat treatment deformation of the material can be removed in this cutting process.

硬化処理としては、高周波焼入れや浸炭焼入れ等にて行われる。高周波加熱による焼き入れとは、高周波電流の流れているコイル中に焼入れに必要な部分を入れ、電磁誘導作用により、ジュール熱を発生させて、伝導性物体を加熱する原理を応用した焼入れ方法である。浸炭焼入れとは、炭素を多く含むガス、液体、固体などの浸炭剤中で鋼を長時間加熱することにより、表面層から炭素を含浸させる処理（浸炭処理）を行い、この浸炭した鋼に対して、焼入れ焼もどしを行う方法である。このため、外輪２３は、高周波焼入れ又は浸炭焼入れ等による硬化処理が可能な鋼材、例えば機械構造用炭素鋼又は機械構造用はだ焼き鋼で製作されている。   As the curing process, induction hardening, carburizing and quenching are performed. Quenching by high-frequency heating is a quenching method that applies the principle of heating a conductive object by placing Joule heat in a coil through which high-frequency current flows, and generating Joule heat by electromagnetic induction. is there. Carburizing and quenching is a process in which carbon is impregnated from the surface layer (carburizing treatment) by heating the steel for a long time in a carburizing agent such as carbon-rich gas, liquid or solid. This is a method of quenching and tempering. For this reason, the outer ring 23 is made of a steel material that can be hardened by induction hardening or carburizing quenching, for example, carbon steel for machine structure or case hardening steel for machine structure.

切削工具として、このような切削が可能なバイト使用する。焼入鋼切削の可能なバイトとして、例えばＣＢＮ（立方晶窒化硼素）に特殊セラミックス結合材を加えた焼結体工具等を使用することができる。   A cutting tool capable of such cutting is used as a cutting tool. As a cutting tool capable of cutting hardened steel, for example, a sintered tool obtained by adding a special ceramic binder to CBN (cubic boron nitride) can be used.

この場合、図２に示すように、外輪２３のトラック溝２２，２２間の内径面２１を、少なくともトラック溝間の中間部２１ａがケージ２８の外径面（外球面）２８ａと接触するとともにトラック溝側においてケージ２８の外径面２８ａとの間に隙間Ｓ，Ｓを形成する非円形形状としている。なお、ケージ２８の内径面２８ｂは内輪２６の外径面２４に摺接する。   In this case, as shown in FIG. 2, the inner diameter surface 21 between the track grooves 22 and 22 of the outer ring 23 and at least the intermediate portion 21a between the track grooves is in contact with the outer diameter surface (outer spherical surface) 28a of the cage 28 and the track. On the groove side, a non-circular shape is formed in which gaps S, S are formed between the outer diameter surface 28 a of the cage 28. The inner diameter surface 28 b of the cage 28 is in sliding contact with the outer diameter surface 24 of the inner ring 26.

具体的には、例えば、外輪２３のトラック溝２２、２２間の内径面２１を単一円弧とする場合には、ケージ２８の外球面２８ａの外径半径（ケージ外径半径）をＲｃとし、外輪２３の内径面２１の内径半径（焼入鋼切削面の内径半径）をＲとしたときに、Ｒｃ＜Ｒとする。これによって、外輪２３の中心軸線に直交する断面において、隙間Ｓ、Ｓはそれぞれトラック溝間の中間部２１ａからトラック溝２２に向かって拡大する。   Specifically, for example, when the inner diameter surface 21 between the track grooves 22 of the outer ring 23 is a single arc, the outer diameter radius (cage outer diameter radius) of the outer spherical surface 28a of the cage 28 is Rc, Rc <R, where R is the inner radius of the inner diameter surface 21 of the outer ring 23 (the inner radius of the hardened steel cutting surface). As a result, in the cross section perpendicular to the central axis of the outer ring 23, the gaps S and S expand from the intermediate portion 21a between the track grooves toward the track groove 22, respectively.

次に、図３は隙間Ｓの変形例を示し、この場合、接触部（中間部）２１ａの内径面の内径を、外輪中心をして半径Ｒｃ（ケージ２８の外径面２８ａの外径半径）とした場合に、非接触部（端部）２１ｂ（ケージ２８の外径面２８ａと接触しない範囲）の内径面を平面状としている。これによって、接触部２１ａの範囲（焼入鋼切削円弧面の範囲）をＨとし、非接触部（端部）２１ｂの範囲（焼入鋼切削直線部）をＨ１としている。なお、Ｈ１は、冷間鍛造であらかじめ形成しておくこともできる。   Next, FIG. 3 shows a modified example of the gap S. In this case, the inner diameter of the inner surface of the contact portion (intermediate portion) 21a is set to the radius Rc (the outer diameter radius of the outer diameter surface 28a of the cage 28) with the outer ring center. ), The inner diameter surface of the non-contact portion (end portion) 21b (the range not in contact with the outer diameter surface 28a of the cage 28) is flat. Thereby, the range of the contact portion 21a (the range of the hardened steel cutting arc surface) is H, and the range of the non-contact portion (end portion) 21b (the hardened steel cutting straight line portion) is H1. H1 can also be formed in advance by cold forging.

本発明によれば、外輪２３の内径面２１において、トラック溝側においてケージ２８の外径面２８ａとの間に隙間Ｓ，Ｓを形成するので、大きな作動角で大きなトルクが負荷された場合に回転が継続されて、外輪２３の内径面（内球面）２１のトラック溝エッジ部Ｅに盛り上がり部が形成されても、この盛り上がり部が隙間Ｓ，Ｓに吸収される。このため、この盛り上がり部がケージ２８の外径面２８ａに干渉することを防止することができ、ケージ２８の損傷を回避することができる。しかも、この隙間Ｓ，Ｓによってケージ２８の外径面２８ａと外輪２３の内径面２１との間へのグリースの介入性が向上し、作動性及び耐久性に優れる等速自在継手となる。   According to the present invention, the gaps S, S are formed between the inner diameter surface 21 of the outer ring 23 and the outer diameter surface 28a of the cage 28 on the track groove side, so that a large torque is applied at a large operating angle. Even if the rotation is continued and a raised portion is formed at the track groove edge portion E of the inner diameter surface (inner spherical surface) 21 of the outer ring 23, the raised portion is absorbed by the gaps S and S. For this reason, it is possible to prevent the raised portion from interfering with the outer diameter surface 28a of the cage 28, and damage to the cage 28 can be avoided. In addition, the gaps S and S improve the intervention of grease between the outer diameter surface 28a of the cage 28 and the inner diameter surface 21 of the outer ring 23, so that a constant velocity universal joint excellent in operability and durability is obtained.

外輪２３の内径面２１においては、仕上げに研削加工を行う必要がなくなる。このため、環境上好ましくない研削クーラントの使用を控えることができ、環境にやさしい加工が可能であって、しかも低コスト化を図ることができる。硬化層が形成された部位が耐摩耗性、耐寿命性等に優れ、高品質の等速自在継手となる。   On the inner diameter surface 21 of the outer ring 23, it is not necessary to perform grinding for finishing. For this reason, it is possible to refrain from using environmentally unfavorable grinding coolant, enabling environmentally friendly processing and reducing costs. The portion where the hardened layer is formed is excellent in wear resistance, life resistance and the like, and becomes a high-quality constant velocity universal joint.

隙間Ｓがトラック溝間の中間部からトラック溝２２に向かって拡大するものであれば、この隙間Ｓによって、エッジロードによる外輪内径面（外輪２３の内径面２１のトラック溝エッジ部Ｅ）に生じる盛り上がり部を安定して吸収することができ、ケージ２８への損傷防止機能が安定する。しかも、隙間形成のための加工は、旋盤において、加工物（外輪）のトラック溝位置の回転位相と同期して、工具の突き出し位置を、カム又は数値制御により制御することにより、可能であり、生産性の向上を図ることができる。   If the gap S expands from the intermediate portion between the track grooves toward the track groove 22, this gap S causes an outer ring inner diameter surface (track groove edge portion E of the inner diameter surface 21 of the outer ring 23) due to edge loading. The raised portion can be stably absorbed, and the function of preventing damage to the cage 28 is stabilized. Moreover, the machining for forming the gap is possible by controlling the protruding position of the tool by a cam or numerical control in a lathe in synchronization with the rotational phase of the track groove position of the workpiece (outer ring). Productivity can be improved.

次に、図４は他の実施形態を示し、この場合、内輪２６及び外輪２３のトラック溝ボール中心軌跡線が円弧部とストレート部とを備えたアンダーカットフリー型の等速自在継手である。すなわち、前記外輪２３のトラック溝２２は、トラック溝ボール中心軌跡線が円弧部となる奥側トラック溝２２ａと、トラック溝ボール中心軌跡線が外輪軸線と平行なストレート部となる開口側トラック溝２２ｂとからなる。奥側トラック溝２２ａは、その曲率中心Ｏ１を継手中心Ｏから軸方向に外輪２３の開口側にずらしている。また、内輪２６のトラック溝２５は、トラック溝ボール中心軌跡線が内輪軸線と平行なストレート部となる奥側トラック溝２５ａと、トラック溝ボール中心軌跡線が円弧部となる開口側トラック溝２５ｂとからなる。開口側トラック溝２５ｂの曲率中心Ｏ２を継手中心Ｏから軸方向に外輪２３の奥側トラック溝２２ａの曲率中心Ｏ１と反対側の奥側に等距離ｆ１だけ離して設けている。   Next, FIG. 4 shows another embodiment. In this case, the track groove ball center locus line of the inner ring 26 and the outer ring 23 is an undercut-free constant velocity universal joint having an arc portion and a straight portion. That is, the track groove 22 of the outer ring 23 includes a back-side track groove 22a in which the track groove ball center locus line is an arc portion, and an opening-side track groove 22b in which the track groove ball center locus line is a straight portion parallel to the outer ring axis. It consists of. The back side track groove 22 a has its center of curvature O 1 shifted from the joint center O in the axial direction toward the opening side of the outer ring 23. The track groove 25 of the inner ring 26 includes a back-side track groove 25a in which the track groove ball center locus line is a straight portion parallel to the inner ring axis, and an opening-side track groove 25b in which the track groove ball center locus line is an arc portion. Consists of. The center of curvature O2 of the opening side track groove 25b is provided from the joint center O in the axial direction at an equal distance f1 on the far side opposite to the center of curvature O1 of the back side track groove 22a of the outer ring 23.

この場合も、外輪２３のトラック溝間の内径面２１を、少なくともトラック溝間の中間部２１ａがケージ２８の外径面２８ａと接触するとともにトラック溝側においてケージ２８の外径面２８ａとの間に隙間Ｓを形成する非円形形状としている。すなわち、外輪２３の中心軸線に直交する断面において、隙間Ｓ，Ｓはトラック溝間の中間部２１ａからトラック溝２２に向かって拡大する。   Also in this case, the inner diameter surface 21 between the track grooves of the outer ring 23 is at least between the outer diameter surface 28a of the cage 28 on the track groove side and at least the intermediate portion 21a between the track grooves is in contact with the outer diameter surface 28a of the cage 28. The non-circular shape that forms the gap S is formed. That is, in the cross section orthogonal to the central axis of the outer ring 23, the gaps S and S expand from the intermediate portion 21a between the track grooves toward the track groove 22.

この等速自在継手の他の構成は前記図１に示した等速自在継手と同様の構成であるので、同一の部材については図１と同一の符号を付してそれらの説明を省略する。このため、この等速自在継手であっても、図１に示した等速自在継手と同様の作用効果を奏する。   Since the other configuration of this constant velocity universal joint is the same as that of the constant velocity universal joint shown in FIG. 1, the same members are denoted by the same reference numerals as those in FIG. 1 and their description is omitted. Therefore, even this constant velocity universal joint has the same effects as the constant velocity universal joint shown in FIG.

次に図５と図６は別の実施形態を示し、ダブルオフセット型等速自在継手（ＤＯＪ）の摺動式等速自在継手である。この等速自在継手は、円筒状の内径面３１に複数の直線状のトラック溝３２を軸方向に形成した外側継手部材としての外輪３３と、球面状の外径面３４に複数の直線状のトラック溝３５を軸方向に形成した内側継手部材としての内輪３６と、外輪３３のトラック溝３２と内輪３６のトラック溝３５との間に介在してトルクを伝達するボール３７と、外輪３３の内径面３１と内輪３６の外径面３４との間に介在してボール３７を保持するケージ３８とを備える。   Next, FIGS. 5 and 6 show another embodiment, which is a double offset type constant velocity universal joint (DOJ) sliding type constant velocity universal joint. This constant velocity universal joint includes an outer ring 33 as an outer joint member in which a plurality of linear track grooves 32 are formed in an axial direction on a cylindrical inner diameter surface 31, and a plurality of linear shapes on a spherical outer diameter surface 34. An inner ring 36 as an inner joint member in which the track groove 35 is formed in the axial direction, a ball 37 that is interposed between the track groove 32 of the outer ring 33 and the track groove 35 of the inner ring 36, and an inner diameter of the outer ring 33 A cage 38 is provided between the surface 31 and the outer diameter surface 34 of the inner ring 36 to hold the ball 37.

ケージ３８は、ボール３７を収容する複数（この場合、８個）のポケット３９とを備えた環体であり、球面状の外周面（外径面）３８ａが外輪３３の内径面３１に接触案内され、球面状の内周面（内径面）３８ｂが内輪３６の外径面３４に接触案内される。外径面３８ａの曲率中心Ｏ４と内径面３８ｂの曲率中心Ｏ５とは、ボール中心を含む継手中心面Ｐに対して軸方向の反対側にｆ２だけオフセットされている。   The cage 38 is an annulus provided with a plurality of (in this case, eight) pockets 39 for accommodating the balls 37, and a spherical outer peripheral surface (outer diameter surface) 38 a contacts and guides the inner diameter surface 31 of the outer ring 33. Then, the spherical inner circumferential surface (inner diameter surface) 38 b is contacted and guided to the outer diameter surface 34 of the inner ring 36. The curvature center O4 of the outer diameter surface 38a and the curvature center O5 of the inner diameter surface 38b are offset by f2 on the opposite side in the axial direction with respect to the joint center plane P including the ball center.

この場合も、外輪３３のトラック溝間の内径面３１を、少なくともトラック溝間の中間部３１ａがケージ３８の外径面３８ａと接触するとともにトラック溝側においてケージ３８の外径面３８ａとの間に隙間Ｓ（図示省略）を形成する非円形形状としている。すなわち、外輪３３の中心軸線に直交する断面において、隙間Ｓ，Ｓはトラック溝間の中間部３１ａからトラック溝３２に向かって拡大する。   Also in this case, the inner diameter surface 31 between the track grooves of the outer ring 33 is at least between the outer diameter surface 38a of the cage 38 on the track groove side and at least the intermediate portion 31a between the track grooves is in contact with the outer diameter surface 38a of the cage 38. A non-circular shape is formed in which a gap S (not shown) is formed. That is, in the cross section orthogonal to the central axis of the outer ring 33, the gaps S, S expand from the intermediate portion 31a between the track grooves toward the track groove 32.

この場合も、外輪３３の内径面（内円筒面）３１のトラック溝エッジ部Ｅに盛り上がり部が形成されても、この盛り上がり部が隙間Ｓ，Ｓに吸収される。このため、図５に示すような等速自在継手であっても、図１に示す等速自在継手と同様の作用効果を奏する。   Also in this case, even if a raised portion is formed in the track groove edge portion E of the inner diameter surface (inner cylindrical surface) 31 of the outer ring 33, the raised portion is absorbed by the gaps S and S. Therefore, even the constant velocity universal joint as shown in FIG. 5 has the same effect as the constant velocity universal joint shown in FIG.

本発明の他の実施形態としては、トラック溝ボール中心軌跡線が複数の円弧部からなるものであっても、トラック溝ボール中心軌跡線が円弧部とテーパ部（奥側から開口側に向かって拡径するテーパ部）とを備えたものであってもよい。また、外輪及び内輪の円周方向に隣り合うトラック溝の向きを交互に対称となるように配置したものであってもよい。   As another embodiment of the present invention, even if the track groove ball center locus line is composed of a plurality of arc portions, the track groove ball center locus line is formed of the arc portion and the taper portion (from the back side toward the opening side). The taper part which expands diameter) may be provided. Also, the track grooves adjacent to each other in the circumferential direction of the outer ring and the inner ring may be arranged so as to be alternately symmetrical.

このように、等速自在継手としては、固定式であっても摺動式であってもよく、特に固定式である場合に、内側継手部材および外側継手部材のトラック溝ボール中心軌跡線が円弧部とストレート部とを備えたものであれば、継手作動角の高角化を図ることができる。特に、トラック溝ボール中心軌跡線が円弧部とテーパ部とを備えたものであれば、より一層の高角化が可能である。   As described above, the constant velocity universal joint may be a fixed type or a sliding type. In particular, in the case of the fixed type, the track groove ball center locus line of the inner joint member and the outer joint member is an arc. If a part and a straight part are provided, the joint operating angle can be increased. In particular, if the track groove ball center locus line has an arc portion and a tapered portion, the angle can be further increased.

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、等速自在継手として、軸線に対して互いに逆方向に傾いたボール溝を円周方向に交互に形成した外周面を有する内輪と、軸線に対して互いに逆方向に傾いたボール溝を円周方向に交互に形成した内周面を有する外輪と、軸線に対して互いに逆方向に傾いた内輪のボール溝と外輪のボール溝との交差部に組み込んだトルク伝達ボールと、内輪の外周面と外輪の内周面との間に介在してトルク伝達ボールを円周方向で所定間隔に保持するケージとを有するクロスグルーブ型等速自在継手であってもよい。   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 constant velocity universal joint, they are inclined in opposite directions with respect to the axis. An inner ring having an outer peripheral surface in which the ball grooves are alternately formed in the circumferential direction, an outer ring having an inner peripheral surface in which the ball grooves inclined in opposite directions with respect to the axis are alternately formed in the circumferential direction, and an axis On the other hand, a torque transmission ball incorporated at the intersection of the inner ring ball groove and the outer ring ball groove inclined in opposite directions, and a torque transmission ball interposed between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. It may be a cross groove type constant velocity universal joint having a cage held at a predetermined interval in the circumferential direction.

また、各実施形態において、トルク伝達手段としてボール数は任意に設定できる。ボールの周方向配設ピッチとしても等ピッチであっても、不等ピッチであってもよい。   In each embodiment, the number of balls can be arbitrarily set as the torque transmission means. The pitches arranged in the circumferential direction of the balls may be equal pitches or unequal pitches.

本発明の実施形態を示す等速自在継手の断面図である。It is sectional drawing of the constant velocity universal joint which shows embodiment of this invention. 前記図１の外輪の要部拡大断面図である。It is a principal part expanded sectional view of the outer ring | wheel of the said FIG. 本発明の実施形態を示す他の等速自在継手の断面図である。It is sectional drawing of the other constant velocity universal joint which shows embodiment of this invention. 本発明の実施形態を示す別の等速自在継手の断面図である。It is sectional drawing of another constant velocity universal joint which shows embodiment of this invention. 本発明の実施形態を示す別の等速自在継手の断面図である。It is sectional drawing of another constant velocity universal joint which shows embodiment of this invention. 前記図５の等速自在継手の横断面図である。FIG. 6 is a cross-sectional view of the constant velocity universal joint of FIG. 5. 従来の固定式等速自在継手の断面図である。It is sectional drawing of the conventional fixed type constant velocity universal joint. 前記図７の外輪の横断面図である。FIG. 8 is a cross-sectional view of the outer ring of FIG. 7.

符号の説明Explanation of symbols

２１ 内球面
２１ａ 接触部
２１ｂ 非接触部
２２，２５ トラック溝
２４ 外球面
２７ ボール
２８ ケージ
２８ａ 外径面
３１ 内径面
３１ａ 中間部
３２ トラック溝
３４ 外径面
３５ トラック溝
３７ ボール
３８ ケージ
３８ａ 外径面
Ｓ 隙間 21 inner spherical surface 21a contact portion 21b non-contact portion 22, 25 track groove 24 outer spherical surface 27 ball 28 cage 28a outer diameter surface 31 inner diameter surface 31a intermediate portion 32 track groove 34 outer diameter surface 35 track groove 37 ball 38 cage 38a outer diameter surface S clearance

Claims (8)

内径面に複数のトラック溝が形成された外側継手部材と、外径面に複数のトラック溝が形成された内側継手部材と、前記外側継手部材のトラック溝と内側継手部材のトラック溝との間に介在してトルクを伝達する複数のボールと、前記外側継手部材と内側継手部材との間に介在してボールを保持するケージとを備えた等速自在継手であって、
外側継手部材の内径面が焼入れ後に切削を行う焼入鋼切削してなるとともに、外側継手部材のトラック溝間の内径面を、少なくともトラック溝間の中間部がケージの外径面と接触するとともにトラック溝側においてケージの外径面との間に隙間を形成する非円形形状としたことを特徴とする等速自在継手。 An outer joint member having a plurality of track grooves formed on the inner diameter surface, an inner joint member having a plurality of track grooves formed on the outer diameter surface, and between the track grooves of the outer joint member and the track grooves of the inner joint member. A constant velocity universal joint comprising a plurality of balls that transmit torque by being interposed therebetween, and a cage that holds the balls interposed between the outer joint member and the inner joint member,
The inner surface of the outer joint member is cut by quenching steel that performs cutting after quenching, and the inner surface between the track grooves of the outer joint member is at least in contact with the outer diameter surface of the cage. A constant velocity universal joint having a non-circular shape that forms a gap with the outer diameter surface of the cage on the track groove side. 外側継手部材の中心軸線に直交する断面において、前記隙間はトラック溝間の中間部からトラック溝に向かって拡大することを特徴とする請求項１に記載の等速自在継手。   2. The constant velocity universal joint according to claim 1, wherein in the cross section orthogonal to the central axis of the outer joint member, the gap expands from an intermediate portion between the track grooves toward the track groove. 角度変位のみを許容する固定式であることを特徴とする請求項１又は請求項２に記載の等速自在継手。   The constant velocity universal joint according to claim 1, wherein the constant velocity universal joint is a fixed type that allows only angular displacement. 角度変位及び軸方向変位を許容する摺動式であることを特徴とする請求項１又は請求項２に記載の等速自在継手。   The constant velocity universal joint according to claim 1, wherein the constant velocity universal joint is a sliding type that allows angular displacement and axial displacement. 前記内側継手部材及び外側継手部材のトラック溝ボール中心軌跡線が単一の円弧部からなることを特徴とする請求項３に記載の等速自在継手。   4. The constant velocity universal joint according to claim 3, wherein the track groove ball center locus line of the inner joint member and the outer joint member is formed of a single arc portion. 前記内側継手部材及び外側継手部材のトラック溝ボール中心軌跡線が複数の円弧部からなることを特徴とする請求項３に記載の等速自在継手。   4. The constant velocity universal joint according to claim 3, wherein the track groove ball center locus line of the inner joint member and the outer joint member includes a plurality of arc portions. 内側継手部材及び外側継手部材のトラック溝ボール中心軌跡線が円弧部とストレート部とを備えたことを特徴とする請求項３に記載の等速自在継手。   The constant velocity universal joint according to claim 3, wherein the track groove ball center locus line of the inner joint member and the outer joint member includes an arc portion and a straight portion. 外側継手部材及び内側継手部材の円周方向に隣り合うトラック溝の向きを交互に対称となるように配置したことを特徴とする請求項３又は請求項５〜請求項７のいずれか１項に記載の等速自在継手。   8. The outer joint member and the inner joint member are arranged so that the directions of the track grooves adjacent to each other in the circumferential direction are alternately symmetric, according to claim 3 or any one of claims 5 to 7. The constant velocity universal joint described.
JP2008075493A 2008-03-24 2008-03-24 Constant velocity universal joint Withdrawn JP2009228809A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011040504A1 (en) 2009-09-30 2011-04-07 凸版印刷株式会社 Nucleic acid analyzer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011040504A1 (en) 2009-09-30 2011-04-07 凸版印刷株式会社 Nucleic acid analyzer

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