JP2009002388A - Tripod constant velocity universal joint - Google Patents

Tripod constant velocity universal joint Download PDF

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JP2009002388A
JP2009002388A JP2007161501A JP2007161501A JP2009002388A JP 2009002388 A JP2009002388 A JP 2009002388A JP 2007161501 A JP2007161501 A JP 2007161501A JP 2007161501 A JP2007161501 A JP 2007161501A JP 2009002388 A JP2009002388 A JP 2009002388A
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trunnion
constant velocity
universal joint
velocity universal
trunnion journal
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Taku Itagaki
卓 板垣
Tatsuro Sugiyama
達朗 杉山
Hiroshi Murakami
裕志 村上
Takaaki Shibata
貴章 柴田
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2007161501A priority Critical patent/JP2009002388A/en
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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

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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 tripod constant velocity universal joint having a trunnion journal, which is inexpensively manufactured with small adverse effects on an environment and with high productivity by a simple device, and also is excellent in dimensional accuracy and surface roughness. <P>SOLUTION: In this tripod constant velocity universal joint, the peripheral surface 24 of the trunnion journal 22 is hardened and tempered, and subsequently subjected to dry cutting. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、トリポード型等速自在継手に関する。   The present invention relates to a tripod type constant velocity universal joint.

例えば自動車や産業機械の動力伝達装置には、駆動軸と従動軸を接続するためにトリポード型等速自在継手が用いられている。トリポード型等速自在継手は、駆動軸と従動軸が作動角をとった状態でも等速で回転トルクを伝達し、しかも、軸方向の相対変位をも許容することができる構造を備えている。   For example, a tripod type constant velocity universal joint is used in a power transmission device of an automobile or an industrial machine to connect a drive shaft and a driven shaft. The tripod type constant velocity universal joint has a structure capable of transmitting rotational torque at a constant speed even when the drive shaft and the driven shaft have an operating angle, and also allowing relative displacement in the axial direction.

図１および図２に示すように、トリポード型等速自在継手は、連結すべき二軸のうちの一方の回転軸と接続する外側継手部材１０と、他方の回転軸と接続するトリポード・ユニット（２０，３０，３２）とを主要な構成要素としている。   As shown in FIGS. 1 and 2, the tripod type constant velocity universal joint includes an outer joint member 10 connected to one rotary shaft of two shafts to be coupled, and a tripod unit ( 20, 30, 32) are the main components.

外側継手部材１０は、周方向等分位置に軸方向に延びる３本のトラック溝１２を配置した中空カップ状である。各トラック溝１２は向かい合った側壁にローラ案内面１４を形成している。このローラ案内面１４は外側継手部材１０の軸と平行な軸を有する円筒面の一部すなわち部分円筒面である。外側継手部材１０の径方向断面は、周方向に交互に現れる直径Ｄ１の小内径部１６と直径Ｄ２の大内径部１８とをローラ案内面１４で接続した花冠状を呈している。   The outer joint member 10 has a hollow cup shape in which three track grooves 12 extending in the axial direction are disposed at circumferentially equal positions. Each track groove 12 forms a roller guide surface 14 on the opposite side wall. The roller guide surface 14 is a part of a cylindrical surface having an axis parallel to the axis of the outer joint member 10, that is, a partial cylindrical surface. The cross section in the radial direction of the outer joint member 10 has a corolla shape in which small inner diameter portions 16 having a diameter D1 and large inner diameter portions 18 having a diameter D2 appearing alternately in the circumferential direction are connected by a roller guide surface 14.

トリポード・ユニットは、トラニオン２０とローラ３０と複数の針状ころ３２を有する。   The tripod unit includes a trunnion 20, a roller 30, and a plurality of needle rollers 32.

トラニオン２０は、周方向等分位置に径方向に突出した３本の円柱形状のトラニオン・ジャーナル２２を有する。各トラニオン・ジャーナル２２は、外周面２４と、軸端付近に形成された環状の輪溝２６を備えている。トラニオン・ジャーナル２２の外周に複数の針状ころ３２を介して回転自在にローラ３０が外嵌している。トラニオン・ジャーナル２２の外周面２４は針状ころ３２の内側軌道面を提供する。ローラ３０の内周面は円筒形で、針状ころ３２の外側軌道面を提供する。   The trunnion 20 has three columnar trunnion journals 22 projecting radially in the circumferentially equal position. Each trunnion journal 22 includes an outer peripheral surface 24 and an annular ring groove 26 formed near the shaft end. A roller 30 is externally fitted to the outer periphery of the trunnion journal 22 via a plurality of needle rollers 32. The outer peripheral surface 24 of the trunnion journal 22 provides an inner raceway surface for the needle rollers 32. The inner peripheral surface of the roller 30 is cylindrical and provides the outer raceway surface of the needle roller 32.

針状ころ３２はトラニオン２０の径方向外方の端面にてアウタ・ワッシャ３４と接し、反対側の端面にてインナ・ワッシャ３８と接している。アウタ・ワッシャ３４は輪溝２６に装着されたサークリップ３６によって軸方向移動を規制されているため、結局、針状ころ３２も軸方向移動を規制される。アウタ・ワッシャ３４は、トラニオン・ジャーナル２２の径方向に延びた円盤部３４ａと、トラニオン・ジャーナル２２の軸方向に延びた円筒部３４ｂとからなる。アウタ・ワッシャ３４の円筒部３４ｂはローラ３０の内径より小さな外径を有し、トラニオン２０の径方向外方の端部３４ｃにてローラ３０の内径よりも大径に拡大している。したがって、アウタ・ワッシャ３４の円筒部３４ｂの外径が拡大していない範囲で、ローラ３０はトラニオン・ジャーナル２２の軸方向に移動することができる。   The needle rollers 32 are in contact with the outer washer 34 at the radially outer end face of the trunnion 20 and are in contact with the inner washer 38 at the opposite end face. Since the outer washer 34 is restricted from moving in the axial direction by a circlip 36 attached to the ring groove 26, the needle roller 32 is also restricted from moving in the axial direction. The outer washer 34 includes a disc portion 34 a extending in the radial direction of the trunnion journal 22 and a cylindrical portion 34 b extending in the axial direction of the trunnion journal 22. The cylindrical portion 34 b of the outer washer 34 has an outer diameter smaller than the inner diameter of the roller 30, and expands larger than the inner diameter of the roller 30 at the radially outer end 34 c of the trunnion 20. Therefore, the roller 30 can move in the axial direction of the trunnion journal 22 within a range where the outer diameter of the cylindrical portion 34b of the outer washer 34 is not enlarged.

ローラ３０の外周面は球面の一部すなわち部分球面状であるが、軸から径方向に離れた位置にその曲率中心を有し、ローラ案内面１４よりも僅かに曲率半径が小さくなっている。また、ローラ３０とローラ案内面１４との接触形態は、断面で見て円弧同士の接触すなわちサーキュラ・コンタクトとなる（特許文献１参照）。
特許第３６１５９８７号公報 The outer peripheral surface of the roller 30 is a part of a spherical surface, that is, a partial spherical shape, but has a center of curvature at a position radially away from the shaft, and has a slightly smaller radius of curvature than the roller guide surface 14. Further, the contact form between the roller 30 and the roller guide surface 14 is a contact between arcs, that is, a circular contact when viewed in cross section (see Patent Document 1).
Japanese Patent No. 3615987

ところで、トラニオン２０のトラニオン・ジャーナル２２は、針状ころ３２と接触する箇所であり、継手が回転駆動する際に垂直荷重と共に転動や滑りの影響等大きな負荷を受ける。また、耐久性や振動特性の面から、トラニオン・ジャーナル２２の外周面２４と針状ころ３２は所定の隙間を設けて管理する必要がある。このために、トラニオン・ジャーナル２２の外周面２４の表面性状や寸法精度を良好にするために、外周面２４は研削加工で仕上げることが一般的である。これは、トラニオン・ジャーナル２２の外周面２４にインナーリングと呼ばれる部材が接触するタイプのトリポード型等速自在継手の場合でも同様である。   By the way, the trunnion journal 22 of the trunnion 20 is a portion in contact with the needle roller 32, and receives a large load such as the influence of rolling and slipping along with the vertical load when the joint is rotationally driven. Further, from the viewpoint of durability and vibration characteristics, it is necessary to manage the outer peripheral surface 24 of the trunnion journal 22 and the needle rollers 32 with a predetermined gap. Therefore, in order to improve the surface properties and dimensional accuracy of the outer peripheral surface 24 of the trunnion journal 22, the outer peripheral surface 24 is generally finished by grinding. The same applies to a tripod type constant velocity universal joint in which a member called an inner ring is in contact with the outer peripheral surface 24 of the trunnion journal 22.

研削加工では、粉状の研削屑が生じ、研削屑は研削油と共に研削スラッジとして排出される。研削スラッジは、研削屑を濾過したうえで一部が研削油に再利用される一方、濾過により得られた高濃度スラッジは廃棄処分される。このように、研削加工は、研削油の供給装置や濾過装置が必要となるので装置構成が複雑になる。更に、研削油の消費及び研削油の供給電力消費は多大なものとなり、コスト高になる。また、廃棄されたスラッジが環境に悪影響を与えるおそれがある。また、加工作業において研削油の供給のための前準備が必要であり、作業に手間がかかって生産性が低いという問題がある。   In the grinding process, powdery grinding waste is generated, and the grinding waste is discharged as grinding sludge together with the grinding oil. The grinding sludge is partly reused as grinding oil after filtering the grinding waste, while the high-concentration sludge obtained by filtration is discarded. As described above, the grinding process requires a grinding oil supply device and a filtration device, so that the device configuration is complicated. Furthermore, the consumption of the grinding oil and the power consumption of the grinding oil become enormous and the cost increases. In addition, the discarded sludge may adversely affect the environment. In addition, preparation for supplying the grinding oil is necessary in the machining operation, and there is a problem that the operation takes time and productivity is low.

本発明は、上記事情に鑑み、環境への悪影響が少なく、高い生産性かつ低コストで簡易な装置により製造可能であると共に寸法精度及び表面粗さの良好なトラニオン・ジャーナルを有するトリポード型等速自在継手を提供することを課題とする。   In view of the above circumstances, the present invention has a tripod type constant velocity having a trunnion journal that has a small adverse effect on the environment, can be manufactured by a simple device with high productivity and low cost, and has good dimensional accuracy and surface roughness. It is an object to provide a universal joint.

前記課題を解決するため、本発明は、内周に軸方向の三本のトラック溝を有し、各トラック溝の向かい合った側壁にローラ案内面を形成した外側継手部材と、径方向に突出した三本の円柱形状のトラニオン・ジャーナルを有するトラニオンと、各トラニオン・ジャーナルに回転自在に外嵌し、前記トラック溝内に収容されたローラとを備え、前記ローラがその外周面において前記ローラ案内面によって案内されるようにしたトリポード型等速自在継手において、前記トラニオン・ジャーナルの外周面をドライ切削したことを特徴とする。   In order to solve the above-mentioned problems, the present invention has an outer joint member having three track grooves in the axial direction on the inner periphery and having a roller guide surface formed on opposite side walls of each track groove, and protruding in the radial direction. A trunnion having three cylindrical trunnion journals, and a roller externally fitted to each trunnion journal and accommodated in the track groove, and the roller guide surface on the outer circumferential surface thereof. In the tripod type constant velocity universal joint guided by the above, the outer peripheral surface of the trunnion journal is dry-cut.

このような構成によれば、ドライ切削は、切削油等の加工流体を使用しない加工方法であるため、従来の研削で必要であった供給装置や濾過装置が不要になり切削装置の構成を簡易に出来る。更に、研削油の消費及び研削油の供給電力消費がなくなり、コスト削減ができる。スラッジが廃棄されることもなくなり、環境に悪影響を与えるおそれがなくなる。また、加工作業において研削油の供給のための前準備が不要になり、生産性が向上する。   According to such a configuration, since dry cutting is a processing method that does not use a processing fluid such as cutting oil, the supply device and the filtering device that are necessary in conventional grinding are not required, and the configuration of the cutting device is simplified. I can do it. Furthermore, the consumption of grinding oil and the power consumption of the grinding oil are eliminated, and the cost can be reduced. Sludge is no longer discarded and there is no risk of adverse environmental effects. In addition, the preparation for supplying the grinding oil is not necessary in the machining operation, and the productivity is improved.

上記構成において、前記トラニオン・ジャーナルの外周面に対して複数の針状ころが直接転動することにより、前記トラニオン・ジャーナルに対して前記ローラが回転自在であり、前記トラニオン・ジャーナルの外周面において、少なくとも前記針状ころが直接転動する領域をドライ切削することが好ましい。   In the above configuration, the plurality of needle rollers rolls directly with respect to the outer peripheral surface of the trunnion journal, so that the roller is rotatable with respect to the trunnion journal. It is preferable to dry-cut at least a region where the needle rollers directly roll.

このような構成によれば、ドライ切削により得られるトラニオン・ジャーナルの外周面に対して針状ころが滑らかに転動すると共に、トラニオン・ジャーナルの転動疲労寿命と継手回転駆動中の振動特性を良好なものとすることができる。   According to such a configuration, the needle rollers smoothly roll with respect to the outer peripheral surface of the trunnion journal obtained by dry cutting, and the rolling fatigue life of the trunnion journal and the vibration characteristics during joint rotation driving are reduced. It can be good.

上記構成において、前記ドライ切削されたトラニオン・ジャーナルの外周面の表面粗さをＲａ１.０以下とすることが好ましい。   In the above configuration, it is preferable that the dry-cut trunnion journal has a surface roughness Ra of 1.0 or less.

このような構成によれば、上記の作用及び効果がより効果的に得られる。   According to such a structure, said effect | action and effect are acquired more effectively.

上記構成において、前記ドライ切削されるトラニオン・ジャーナルを有するトラニオンを予め浸炭焼き入れ焼き戻しすることが好ましい。   In the above configuration, it is preferable that the trunnion having the trunnion journal to be dry-cut is previously carburized, quenched, and tempered.

このような構成によれば、トラニオンに硬化層が形成されトラニオンの耐久性が向上する。   According to such a configuration, a cured layer is formed on the trunnion, and the durability of the trunnion is improved.

上記構成において、前記ドライ切削されるトラニオン・ジャーナルを有するトラニオンを予め浸炭窒化焼き入れ焼き戻しすることが好ましい。   In the above-described configuration, it is preferable that the trunnion having the trunnion journal to be dry-cut is preliminarily carbonitrided, quenched, and tempered.

このような構成によれば、上記と同様の作用及び効果が得られる。   According to such a configuration, the same operations and effects as described above can be obtained.

上記構成において、前記ドライ切削されるトラニオン・ジャーナルを有するトラニオンを予め高周波焼き入れ焼き戻しすることが好ましい。   In the above configuration, it is preferable that the trunnion having the trunnion journal to be dry-cut is tempered and tempered in advance.

このような構成によれば、上記と同様の作用及び効果が得られる。   According to such a configuration, the same operations and effects as described above can be obtained.

上記構成において、前記ドライ切削されるトラニオン・ジャーナルを有するトラニオンにおいて、少なくとも前記トラニオン・ジャーナルの外周面及び根元部を、予め高周波焼き入れ焼き戻しすることが好ましい。   In the above configuration, in the trunnion having the trunnion journal to be dry-cut, it is preferable that at least the outer peripheral surface and the root portion of the trunnion journal are induction hardened and tempered in advance.

このような構成によれば、少なくともトラニオン・ジャーナルの外周面及び根元部に上記と同様の作用及び効果が得られる。   According to such a configuration, the same operation and effect as described above can be obtained at least on the outer peripheral surface and the root portion of the trunnion journal.

本発明によれば、環境への悪影響が少なく、高い生産性かつ低コストで簡易な装置により製造可能であると共に寸法精度及び表面粗さの良好なトラニオン・ジャーナルを有するトリポード型等速自在継手を提供することができる。   According to the present invention, there is provided a tripod type constant velocity universal joint having a trunnion journal that has a small adverse effect on the environment, can be manufactured by a simple device with high productivity and low cost, and has good dimensional accuracy and surface roughness. Can be provided.

以下、本発明を実施するための最良の形態について説明する。   Hereinafter, the best mode for carrying out the present invention will be described.

本実施形態のトリポード型等速自在継手の構造は、図１及び図２を用いて説明したトリポード型等速自在継手と同一であるので、図１及び図２に基づいて説明する。また、構造については既に説明した通りなので説明を省略し、加工方法等の相違点のみを説明する。   Since the structure of the tripod type constant velocity universal joint of this embodiment is the same as that of the tripod type constant velocity universal joint described with reference to FIGS. 1 and 2, the structure will be described with reference to FIGS. 1 and 2. Further, since the structure has already been described, the description thereof will be omitted, and only differences in processing methods and the like will be described.

トラニオン２０は、円柱形状のトラニオン・ジャーナル２２に仕上げ加工を行なう前に予め、浸炭焼き入れ焼戻し、浸炭窒化焼き入れ、高周波焼き入れ焼戻しのいずれかを行なう。これにより、トラニオン２０の表面に焼き入れ硬化層が形成され、耐久性が向上する。尚、高周波焼き入れ焼戻しについては、少なくともトラニオン・ジャーナル２２の外周面２４及び継手回転駆動時に曲げ応力が働く根元部に焼き入れ硬化層が形成されることが望ましい。   The trunnion 20 performs any one of carburizing quenching tempering, carbonitriding quenching quenching, and induction quenching tempering before finishing the cylindrical trunnion journal 22. Thereby, a hardening hardening layer is formed in the surface of trunnion 20, and durability improves. For induction quenching and tempering, it is desirable that a hardened hardened layer is formed at least on the outer peripheral surface 24 of the trunnion journal 22 and the root portion where bending stress is applied when the joint is driven to rotate.

上記熱処理の後に、トラニオン・ジャーナル２２の外周面２４をドライ切削により仕上げる。ドライ切削には、例えば立方晶窒化硼素（ＣＢＮ）に特殊セラミックス結合剤を加えた焼結体からなるバイトが用いられる。   After the heat treatment, the outer peripheral surface 24 of the trunnion journal 22 is finished by dry cutting. For dry cutting, for example, a cutting tool made of a sintered body obtained by adding a special ceramic binder to cubic boron nitride (CBN) is used.

ドライ切削は、切削油等の加工流体を使用しない加工方法であるため、従来の研削で必要であった供給装置や濾過装置が不要になり切削装置の構成を簡易に出来る。更に、研削油の消費及び研削油の供給電力消費がなくなり、コスト削減ができる。スラッジが廃棄されることもなくなり、環境に悪影響を与えるおそれがなくなる。また、加工作業において研削油の供給のための前準備が不要になり、生産性が向上する。   Since dry cutting is a processing method that does not use a processing fluid such as cutting oil, a supply device and a filtration device that are necessary in conventional grinding are not required, and the configuration of the cutting device can be simplified. Furthermore, the consumption of grinding oil and the power consumption of the grinding oil are eliminated, and the cost can be reduced. Sludge is no longer discarded and there is no risk of adverse environmental effects. In addition, the preparation for supplying the grinding oil is not necessary in the machining operation, and the productivity is improved.

上記トラニオン・ジャーナル２２の外周面２４に対するドライ切削は、外周面２４において少なくとも針状ころ３２が接触する領域に行なえばよい。また、ドライ切削を行なった外周面２４の領域の表面粗さはＲａ１．０以下とし、望ましくはＲａ０．５以下とする。このような表面粗さであれば、ドライ切削により得られる外周面２４の寸法精度と相俟って、針状ころ３２と接触する外周面２４に対して針状ころ３２が滑らかに転動する。また、トラニオン・ジャーナル２２の転動疲労寿命と継手回転駆動中の振動特性を良好なものとすることができる。   What is necessary is just to perform the dry cutting with respect to the outer peripheral surface 24 of the said trunnion journal 22 to the area | region where the needle-shaped roller 32 contacts in the outer peripheral surface 24 at least. Further, the surface roughness of the outer peripheral surface 24 subjected to dry cutting is Ra 1.0 or less, and preferably Ra 0.5 or less. With such surface roughness, in combination with the dimensional accuracy of the outer peripheral surface 24 obtained by dry cutting, the needle rollers 32 roll smoothly with respect to the outer peripheral surface 24 in contact with the needle rollers 32. . Further, the rolling fatigue life of the trunnion journal 22 and the vibration characteristics during joint rotation driving can be improved.

上記実施形態は、本発明をトラニオン・ジャーナルに針状ころが直接接触するタイプのトリポード型等速自在継手に適用したものであるが、本発明はこれ以外のトリポード型等速自在継手にも適用可能である。例えば、トラニオン・ジャーナルにインナーリングが直接接触するタイプのトリポード型等速自在継手にも適用可能である。   In the above embodiment, the present invention is applied to a tripod type constant velocity universal joint in which the needle roller is in direct contact with the trunnion journal. However, the present invention is also applied to other tripod type constant velocity universal joints. Is possible. For example, the invention can also be applied to a tripod type constant velocity universal joint in which an inner ring is in direct contact with a trunnion journal.

（Ａ）はトリポード型等速自在継手の縦断正面図、（Ｂ）はトリポード型等速自在継手の縦断側面図である。(A) is a longitudinal front view of a tripod type constant velocity universal joint, and (B) is a longitudinal side view of the tripod type constant velocity universal joint. （Ａ）はトリポード型等速自在継手の外側継手部材の縦断正面図、（Ｂ）はトリポード型等速自在継手のトラニオン・ジャーナル周辺の縦断正面図、（Ｃ）は（Ｂ）の部分拡大図である。(A) is a longitudinal front view of the outer joint member of the tripod type constant velocity universal joint, (B) is a longitudinal front view of the periphery of the trunnion journal of the tripod type constant velocity universal joint, and (C) is a partially enlarged view of (B). It is.

符号の説明Explanation of symbols

１０ 外側継手部材
１２ トラック溝
１４ ローラ案内面
２０ トラニオン
２２ トラニオン・ジャーナル
２４ トラニオン・ジャーナルの外周面
３０ ローラ
３２ 針状ころ 10 outer joint member 12 track groove 14 roller guide surface 20 trunnion 22 trunnion journal 24 outer surface of trunnion journal 30 roller 32 needle roller

Claims (7)

内周に軸方向の三本のトラック溝を有し、各トラック溝の向かい合った側壁にローラ案内面を形成した外側継手部材と、径方向に突出した三本の円柱形状のトラニオン・ジャーナルを有するトラニオンと、各トラニオン・ジャーナルに回転自在に外嵌し、前記トラック溝内に収容されたローラとを備え、前記ローラがその外周面において前記ローラ案内面によって案内されるようにしたトリポード型等速自在継手において、
前記トラニオン・ジャーナルの外周面をドライ切削したことを特徴とするトリポード型等速自在継手。 It has three axial groove tracks on the inner circumference, outer joint members with roller guide surfaces formed on opposite side walls of each track groove, and three cylindrical trunnion journals projecting in the radial direction A tripod type constant velocity comprising a trunnion and a roller that is rotatably fitted to each trunnion journal and accommodated in the track groove, and the roller is guided by the roller guide surface on the outer peripheral surface thereof. In universal joints,
A tripod type constant velocity universal joint, wherein the outer peripheral surface of the trunnion journal is dry cut. 前記トラニオン・ジャーナルの外周面に対して複数の針状ころが直接転動することにより、前記トラニオン・ジャーナルに対して前記ローラが回転自在であり、前記トラニオン・ジャーナルの外周面において、少なくとも前記針状ころが直接転動する領域をドライ切削したことを特徴とする請求項１に記載のトリポード型等速自在継手。   When a plurality of needle rollers rolls directly with respect to the outer peripheral surface of the trunnion journal, the roller is rotatable with respect to the trunnion journal, and at least the needles on the outer peripheral surface of the trunnion journal The tripod type constant velocity universal joint according to claim 1, wherein a region where the roller is directly rolled is dry-cut. 前記ドライ切削されたトラニオン・ジャーナルの外周面の表面粗さをＲａ１.０以下としたことを特徴とする請求項１又は２のいずれか１項に記載のトリポード型等速自在継手。   The tripod constant velocity universal joint according to claim 1 or 2, wherein the dry-cut trunnion journal has a surface roughness Ra of 1.0 or less. 前記ドライ切削されるトラニオン・ジャーナルを有するトラニオンを予め浸炭焼き入れ焼き戻ししたことを特徴とする請求項１〜３のいずれか１項に記載のトリポード型等速自在継手。   The tripod constant velocity universal joint according to any one of claims 1 to 3, wherein the trunnion having the trunnion journal to be dry-cut is carburized, quenched, and tempered in advance. 前記ドライ切削されるトラニオン・ジャーナルを有するトラニオンを予め浸炭窒化焼き入れ焼き戻ししたことを特徴とする請求項１〜３のいずれか１項に記載のトリポード型等速自在継手。   The tripod constant velocity universal joint according to any one of claims 1 to 3, wherein the trunnion having the trunnion journal to be dry-cut is carbonitrided and quenched and tempered in advance. 前記ドライ切削されるトラニオン・ジャーナルを有するトラニオンを予め高周波焼き入れ焼き戻ししたことを特徴とする請求項１〜３のいずれか１項に記載のトリポード型等速自在継手。   The tripod type constant velocity universal joint according to any one of claims 1 to 3, wherein the trunnion having the trunnion journal to be dry-cut is induction hardened and tempered in advance. 前記ドライ切削されるトラニオン・ジャーナルを有するトラニオンにおいて、少なくとも前記トラニオン・ジャーナルの外周面及び根元部を、予め高周波焼き入れ焼き戻ししたことを特徴とする請求項１〜３のいずれか１項に記載のトリポード型等速自在継手。   4. The trunnion having a trunnion journal to be dry-cut, wherein at least an outer peripheral surface and a root portion of the trunnion journal are preliminarily induction-hardened and tempered. Tripod type constant velocity universal joint.
JP2007161501A 2007-06-19 2007-06-19 Tripod constant velocity universal joint Pending JP2009002388A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017206973A1 (en) * 2016-06-03 2017-12-07 Schaeffler Technologies AG & Co. KG Carbonitriding of universal joint bushes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62171525A (en) * 1986-01-23 1987-07-28 Toyota Motor Corp Manufacture of universal coupling
JP2001193752A (en) * 2000-01-12 2001-07-17 Ntn Corp Constant velocity universal joint
JP2002188653A (en) * 2000-12-20 2002-07-05 Ntn Corp Uniform motion universal joint

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62171525A (en) * 1986-01-23 1987-07-28 Toyota Motor Corp Manufacture of universal coupling
JP2001193752A (en) * 2000-01-12 2001-07-17 Ntn Corp Constant velocity universal joint
JP2002188653A (en) * 2000-12-20 2002-07-05 Ntn Corp Uniform motion universal joint

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017206973A1 (en) * 2016-06-03 2017-12-07 Schaeffler Technologies AG & Co. KG Carbonitriding of universal joint bushes

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