JP2008180247A - Tripod type constant velocity universal joint - Google Patents

Tripod type constant velocity universal joint Download PDF

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JP2008180247A
JP2008180247A JP2007012705A JP2007012705A JP2008180247A JP 2008180247 A JP2008180247 A JP 2008180247A JP 2007012705 A JP2007012705 A JP 2007012705A JP 2007012705 A JP2007012705 A JP 2007012705A JP 2008180247 A JP2008180247 A JP 2008180247A
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joint
constant velocity
velocity universal
type constant
tripod type
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JP4943169B2 (en
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Takaaki Shibata
貴章 柴田
Tatsuro Sugiyama
達朗 杉山
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive tripod type constant velocity universal joint having advantageously high operating performance. <P>SOLUTION: The tripod type constant velocity universal joint comprises an outside joint member 1 having track grooves 2 formed in the inner diameter face at circumferentially trisected positions extending in the axial direction, and a joint internal member 4 provided to be angularly and axially displaceable relative to the outside joint member 1 under the existence of lubricant. The joint internal member 4 consists of a tripod member 5 having leg shafts 6 protruding toward the track grooves 2, and rollers 7 externally fitted to the leg shafts 6 in a rotatable manner and stored in the track grooves 2. In at least one of the outer peripheral face of the leg shaft 6 and the inner peripheral face of the roller 7 opposed to each other, a number of finely recessed voids 8 are randomly provided. <P>COPYRIGHT: (C)2008,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.

等速自在継手は、例えば自動車や各種産業機械の動力伝達機構に組み込んで用いられるもので、互いの交差角度が変化可能に設けられた入力軸と出力軸とを備え、入力軸からの回転トルクを出力軸へ等速で伝達できるように連結するものである。この等速自在継手は、角度変位のみを許容する固定式等速自在継手と、角度変位に加えて軸方向変位をも許容する摺動式等速自在継手とに大別される。   A constant velocity universal joint is used, for example, in a power transmission mechanism of an automobile or various industrial machines. The constant velocity universal joint includes an input shaft and an output shaft that can change the crossing angle of each other, and rotational torque from the input shaft. Are connected to the output shaft so that they can be transmitted at a constant speed. This constant velocity universal joint is roughly classified into a fixed type constant velocity universal joint that allows only angular displacement and a sliding type constant velocity universal joint that allows axial displacement in addition to angular displacement.

例えば、自動車には、エンジンから車輪に回転力を等速で伝達するために、摺動式等速自在継手の一種であるトリポード型等速自在継手が組み込まれる場合がある。ここで、公知のトリポード型等速自在継手の一例を図６（ａ）に示す。同図に示す等速自在継手１００は、内径面の円周方向三等分位置に、軸線方向に延在するトラック溝１０２が形成された外側継手部材１０１と、外側継手部材１０１に対して相対的に角度変位および軸方向変位可能な継手内部部材１０４とを備える。   For example, a tripod type constant velocity universal joint, which is a kind of sliding constant velocity universal joint, may be incorporated in an automobile in order to transmit a rotational force from an engine to wheels at a constant speed. Here, an example of a known tripod type constant velocity universal joint is shown in FIG. The constant velocity universal joint 100 shown in the figure is relative to the outer joint member 101 and the outer joint member 101 in which the track groove 102 extending in the axial direction is formed at the position of the inner surface in the circumferential direction. And a joint inner member 104 capable of angular displacement and axial displacement.

詳細に述べると、継手内部部材１０４は、各トラック溝１０２に向かって突出した三本の脚軸１０６を有するトリポード部材１０５と、各脚軸１０６に回転自在に外嵌されたトルク伝達部材としてのローラアセンブリ１０７とで構成される。ローラアセンブリ１０７は、図６（ｂ）にも示すように、内側ローラ１０８と外側ローラ１１０とを有し、両ローラ１０８，１１０間には多数の針状ころ１０９が配設されている。図示する形態では、さらに、針状ころ１０９の抜け止めを図るために、一対のワッシャ１１１、１１１が設けられている。外側継手部材１０１の各トラック溝１０２には円周方向で対向する一対のローラ案内面１０３，１０３が形成され、継手内部部材１０４は、これを構成するローラアセンブリ１０７（外側ローラ１１０）がローラ案内面１０３に係合されるようにして外側継手部材１０１内に収容される。トラック溝１０２も含め、外側継手部材１０１の内部には潤滑剤（例えば、グリース）が充満され、外側継手部材１０１と継手内部部材１０４とは、潤滑剤を介して相対的に角度変位および軸方向変位する（例えば、特許文献１を参照）。
特開２０００−３２０５６３号公報 More specifically, the joint inner member 104 is a tripod member 105 having three leg shafts 106 projecting toward each track groove 102, and a torque transmission member rotatably fitted on each leg shaft 106. And a roller assembly 107. As shown in FIG. 6B, the roller assembly 107 includes an inner roller 108 and an outer roller 110, and a large number of needle rollers 109 are disposed between the rollers 108 and 110. In the illustrated form, a pair of washers 111 and 111 are further provided to prevent the needle rollers 109 from coming off. Each track groove 102 of the outer joint member 101 is formed with a pair of roller guide surfaces 103 and 103 that are opposed in the circumferential direction, and the joint inner member 104 has a roller assembly 107 (outer roller 110) constituting the roller guide surface. It is accommodated in the outer joint member 101 so as to be engaged with the surface 103. The outer joint member 101 including the track groove 102 is filled with a lubricant (for example, grease), and the outer joint member 101 and the joint inner member 104 are relatively angularly displaced and axially moved through the lubricant. Displace (see, for example, Patent Document 1).
JP 2000-320563 A

近年、等速自在継手に対する動作性能向上および低コスト化の要請が厳しさを増している。しかしながら、上記構成のトリポード型等速自在継手は、長期に亘って高い動作性能を確保できる反面、外側継手部材、トリポード部材、内側ローラ、多数の針状ころ、外側ローラ、およびワッシャといった数多くの部材で構成されているため、部品管理や組み立てに多大な工数を要し、低コスト化の要請に対応するのが困難である。   In recent years, demands for improvement in operation performance and cost reduction for constant velocity universal joints have been increasing. However, the tripod type constant velocity universal joint configured as described above can ensure high performance over a long period of time, but has many members such as an outer joint member, a tripod member, an inner roller, a large number of needle rollers, an outer roller, and a washer. Therefore, it takes a lot of man-hours for parts management and assembly, and it is difficult to meet the demand for cost reduction.

本発明の課題は、高い動作性能を誇り、かつ低コストなトリポード型等速自在継手を提供することにある。   An object of the present invention is to provide a tripod type constant velocity universal joint that boasts high operating performance and is low in cost.

上記課題を解決するため、本発明では、内径面の円周方向三等分位置に、軸線方向に延在するトラック溝が形成された外側継手部材と、潤滑剤の介在下で、外側継手部材に対して相対的に角度変位および軸方向変位可能に設けられた継手内部部材とを備えるトリポード型等速自在継手であって、継手内部部材は、トラック溝に向かって突出した脚軸を有するトリポード部材と、脚軸に回転自在に外嵌され、トラック溝に収容されたローラとからなり、かつ、相互に対向する脚軸の外周面およびローラの内周面のうち、少なくとも何れか一方に微小凹形状のくぼみがランダムに無数設けられていることを特徴とするトリポード型等速自在継手を提供する。   In order to solve the above problems, in the present invention, an outer joint member in which a track groove extending in the axial direction is formed at a circumferentially equally divided position of the inner diameter surface, and an outer joint member under the presence of a lubricant. A tripod type constant velocity universal joint provided with a joint inner member provided so as to be capable of relative angular displacement and axial displacement, wherein the joint inner member has a leg shaft protruding toward the track groove. A member and a roller that is rotatably fitted to the leg shaft and accommodated in the track groove, and at least one of the outer peripheral surface of the leg shaft and the inner peripheral surface of the roller facing each other is minute Provided is a tripod type constant velocity universal joint characterized in that an infinite number of concave recesses are randomly provided.

上記のように、本発明にかかるトリポード型等速自在継手では、これを構成する継手内部部材が、外側継手部材に形成されたトラック溝に向かって突出した脚軸を有するトリポード部材と、脚軸に回転自在に外嵌され、トラック溝に収容されたローラとからなる。そのため、トリポード部材、内側ローラ、多数の針状ころ、外側ローラ、およびワッシャという多数の部材で継手内部部材を構成していた従来構成に比べて部品点数を大幅に削減することができ、部品管理工数や組み立て工数の削減を通じて低コストなトリポード型等速自在継手を提供することができる。   As described above, in the tripod type constant velocity universal joint according to the present invention, the joint inner member constituting the tripod member has the leg shaft protruding toward the track groove formed in the outer joint member, and the leg shaft. And a roller that is rotatably fitted to the track groove and accommodated in the track groove. Therefore, the number of parts can be greatly reduced compared to the conventional configuration in which the joint internal member is composed of a large number of members such as a tripod member, an inner roller, a large number of needle rollers, an outer roller, and a washer. A low-cost tripod type constant velocity universal joint can be provided through reduction in man-hours and assembly man-hours.

上記のように針状ころを排除した場合には、脚軸とローラとが滑り接触状態となるため、継手作動時に大きな摺動抵抗が発生し易くなり、ＮＶＨ性能に悪影響を及ぼすおそれが、ひいては継手の耐久寿命を低下させるおそれがある。そこで本発明では、上記構成に加え、相互に対向する脚軸の外周面およびローラの内周面のうち、少なくとも何れか一方に微小凹形状のくぼみをランダムに無数設けることとした。かかる構成とすれば、くぼみで潤滑剤が安定的に保持され、対向する両面間に潤滑膜が形成され易くなる。そのため、両面間での摩擦抵抗を軽減することができ、ＮＶＨ性能が低下するのを抑制あるいは防止することができる。また、上記構成とすることにより、潤滑不良に起因した焼付きを抑制あるいは防止することもできる。従って、長期に亘って高い動作性能を確保することができる。なお、上記構成を採用することでくぼみの形成工程が追加されることとなるが、上記の部品点数削減によるコスト低減効果が十分に勝るため、全体としては十分な低コスト化が図られる。   When the needle rollers are excluded as described above, the leg shaft and the roller are in a sliding contact state, so that a large sliding resistance is likely to occur during the operation of the joint, which may adversely affect the NVH performance. There is a risk of reducing the durability life of the joint. Therefore, in the present invention, in addition to the above-described configuration, an infinite number of minute concave recesses are randomly provided on at least one of the outer peripheral surface of the leg shaft and the inner peripheral surface of the roller facing each other. With such a configuration, the lubricant is stably held in the recesses, and a lubricating film is easily formed between both opposing surfaces. Therefore, the frictional resistance between both surfaces can be reduced, and the decrease in NVH performance can be suppressed or prevented. Further, by adopting the above configuration, seizure due to poor lubrication can be suppressed or prevented. Therefore, high operating performance can be ensured over a long period of time. In addition, although the formation process of a dent will be added by employ | adopting the said structure, since the cost reduction effect by said number of parts reduction is fully won, sufficient cost reduction is achieved as a whole.

上記のくぼみは、切削等の機械加工や、エッチング等の化学的手法で形成することも可能であるが、前者の手法は多数のくぼみを設けるのに手間がかかり、後者の手法は廃液処理等の問題があり、総じてコスト高となり易い。そのため、上記のくぼみは、バレル加工やショットブラスト等で形成するのが、コスト上および環境上好ましい。   The above indentation can be formed by machining such as cutting or chemical methods such as etching, but the former method requires time and effort to provide a large number of indentations, while the latter method is waste liquid treatment etc. As a whole, the cost tends to be high. Therefore, it is preferable in terms of cost and environment that the above-mentioned recess is formed by barrel processing or shot blasting.

上記の構成において、継手の縦断面において、相互に対向する脚軸の外周面あるいはローラの内周面の何れか一方を、相手部材側に突出した円弧状凸断面に形成すると共に、他方を脚軸の軸線と平行なストレート形状に形成することができる。かかる構成とすれば、特許文献１にも記載されているように、ローラが脚軸に対して首振り揺動自在となる。そのため、外側継手部材と継手内部部材とが作動角をとった状態で回転するときに、ローラとローラ案内面とが斜行状態となるのを回避することができる。従って、スライド抵抗等を軽減することができ、ＮＶＨ性能が低下するのを抑制あるいは防止することができる。   In the above configuration, in the longitudinal section of the joint, either the outer peripheral surface of the leg shaft or the inner peripheral surface of the roller facing each other is formed in an arc-shaped convex cross section protruding toward the counterpart member, and the other is the leg. It can be formed in a straight shape parallel to the axis of the shaft. With this configuration, as described in Patent Document 1, the roller can swing and swing with respect to the leg shaft. Therefore, when the outer joint member and the joint inner member rotate with the operating angle taken, it is possible to avoid the rollers and the roller guide surfaces from being skewed. Therefore, slide resistance and the like can be reduced, and the decrease in NVH performance can be suppressed or prevented.

この場合、脚軸の外周面とローラの内周面とは、脚軸の軸線と直交する断面で、継手の軸線と直交する方向で接触させ、継手の軸線方向で非接触とするのが望ましい。かかる構成とすれば、トルク伝達性を損なうことなく、外側継手部材と継手内部部材とが作動角をとった状態で回転するときに、ローラとローラ案内面とが斜交状態になるのを一層効果的に回避することが可能となる。なお、かかる構成は、例えば脚軸の横断面形状を、継手の軸線と直交する方向に長軸を有する略楕円状に形成することで得ることができる。   In this case, it is desirable that the outer peripheral surface of the leg shaft and the inner peripheral surface of the roller are in a cross section orthogonal to the axis of the leg shaft, contact in a direction orthogonal to the axis of the joint, and not contact in the axial direction of the joint. . With this configuration, when the outer joint member and the joint inner member rotate in the state where the operating angle is taken without impairing the torque transmission, the roller and the roller guide surface are in an oblique state. It can be effectively avoided. Such a configuration can be obtained, for example, by forming the cross-sectional shape of the leg shaft into a substantially elliptical shape having a long axis in a direction orthogonal to the axis of the joint.

以上のように、本発明によれば、部材点数の削減を通じて、低コストなトリポード型等速自在継手を提供することができる。しかも、このトリポード型等速自在継手は、摺動抵抗等の増大に起因したＮＶＨ性能の低下を抑制あるいは防止することが可能であり、長期に亘って高い動作性能を発揮し得る。   As described above, according to the present invention, a low-cost tripod type constant velocity universal joint can be provided through a reduction in the number of members. Moreover, this tripod type constant velocity universal joint can suppress or prevent a decrease in NVH performance due to an increase in sliding resistance or the like, and can exhibit high operating performance over a long period of time.

以下、本発明に係るトリポード型等速自在継手を図面に基づいて説明する。   Hereinafter, a tripod type constant velocity universal joint according to the present invention will be described with reference to the drawings.

図１は、本発明に係るトリポード型等速自在継手の第１実施形態を示すものである。なお、図１（ａ）は継手の横断面図（継手の軸線と直交する方向の断面図）であり、図１（ｂ）は継手の縦断面図（継手の軸線と平行な方向の断面図）である。同図に示すトリポード型等速自在継手は、外側継手部材１と、外側継手部材１の内部に充満された潤滑剤（例えば、グリース）を介して、外側継手部材１に対して相対的に角度変位および軸方向変位可能に設けられた継手内部部材４とで構成される。図示は省略しているが、外側継手部材１あるいは内部継手部材４の何れか一方に入力軸が連結され、他方に出力軸が連結される。   FIG. 1 shows a first embodiment of a tripod type constant velocity universal joint according to the present invention. 1A is a cross-sectional view of the joint (a cross-sectional view in a direction perpendicular to the axis of the joint), and FIG. 1B is a vertical cross-sectional view of the joint (a cross-sectional view in a direction parallel to the axis of the joint). ). The tripod type constant velocity universal joint shown in the figure is relatively angled with respect to the outer joint member 1 through the outer joint member 1 and a lubricant (for example, grease) filled in the outer joint member 1. It is comprised with the coupling internal member 4 provided so that a displacement and an axial direction displacement were possible. Although not shown, the input shaft is connected to either the outer joint member 1 or the inner joint member 4, and the output shaft is connected to the other.

外側継手部材１の内径面には、円周方向三等分位置に、軸線方向に延在するトラック溝２が形成されている。各トラック溝２には、凹曲面状をなし、円周方向で対向する一対のローラ案内面３，３が形成されている。なお、本実施形態では、外側継手部材１の外周面を真円形状とした場合を例示しているが、外側継手部材１の外周面は、隣接するトラック溝２間の厚肉部分を周方向の所定領域で切り欠いた非真円形状ともされる。   A track groove 2 extending in the axial direction is formed on the inner diameter surface of the outer joint member 1 at a position equally divided into three in the circumferential direction. Each track groove 2 is formed with a pair of roller guide surfaces 3 and 3 that are concavely curved and are opposed in the circumferential direction. In the present embodiment, the outer peripheral surface of the outer joint member 1 is illustrated as having a perfect circle shape. However, the outer peripheral surface of the outer joint member 1 has a thick portion between adjacent track grooves 2 in the circumferential direction. It is also considered as a non-circular shape cut out in a predetermined region.

継手内部部材４は、各トラック溝２に向かって突出した脚軸６を有するトリポード部材５と、脚軸６に対して回転自在に外嵌されたローラ７とで構成される。ローラ７の外周面はローラ案内面３形状に対応した凸曲面に形成され、各ローラ７は、対応するトラック溝２のローラ案内面３に係合するようにしてトラック溝２内に収容される。ローラ７は、脚軸６を中心に回転しながら、外側継手部材１（トラック溝２）内に充満された潤滑剤を介して、トラック溝２に沿って軸方向移動する。   The joint internal member 4 includes a tripod member 5 having a leg shaft 6 projecting toward each track groove 2 and a roller 7 that is rotatably fitted to the leg shaft 6. The outer peripheral surface of the roller 7 is formed in a convex curved surface corresponding to the shape of the roller guide surface 3, and each roller 7 is accommodated in the track groove 2 so as to engage with the roller guide surface 3 of the corresponding track groove 2. . The roller 7 moves in the axial direction along the track groove 2 through the lubricant filled in the outer joint member 1 (track groove 2) while rotating around the leg shaft 6.

トリポード部材５を構成する脚軸６の外周面には、図２にも拡大して示すように、微小凹形状（例えば、直径および深さが数μｍ程度）のくぼみ８がランダムに無数設けられている。このくぼみ８は、例えば、平滑面状に形成された脚軸６の外周面にバレル加工を施すことにより形成される。バレル加工としては、回転バレル加工、振動バレル加工、遠心バレル加工、およびジャイロ加工（スピンドル加工）等の公知の手法を採用することができ、またその方式としては乾式および湿式の何れでもよい。なお、図示例では、脚軸６の外周面の全面に亘ってくぼみ８を設けた構成としているが、くぼみ８は必ずしも脚軸６の外周面全面に亘って設ける必要はなく、ローラ７の内周面と対向する（接触する）領域にのみ設ければ足りる。   On the outer peripheral surface of the leg shaft 6 constituting the tripod member 5, an infinite number of minute recesses 8 (for example, a diameter and a depth of about several μm) are randomly provided as shown in an enlarged manner in FIG. ing. The recess 8 is formed, for example, by subjecting the outer peripheral surface of the leg shaft 6 formed in a smooth surface shape to barrel processing. As the barrel processing, known methods such as rotary barrel processing, vibration barrel processing, centrifugal barrel processing, and gyro processing (spindle processing) can be employed, and the method may be either dry or wet. In the illustrated example, the recess 8 is provided over the entire outer peripheral surface of the leg shaft 6, but the recess 8 is not necessarily provided over the entire outer peripheral surface of the leg shaft 6. It suffices to provide it only in the region facing (contacting) the peripheral surface.

このように、くぼみ８の形成手法としてバレル加工を採用すれば、この種の多数のくぼみ８を切削やエッチング等で形成する場合に懸念される加工コストや環境負荷の増大を抑制することができる。なお、くぼみ８の形成手法は、バレル加工に限定されるものではなく、この他にも、例えばショットブラスト加工で形成することもできる。   Thus, if barrel processing is adopted as a method for forming the depressions 8, it is possible to suppress an increase in processing cost and an environmental load that are a concern when a large number of such depressions 8 are formed by cutting or etching. . In addition, the formation method of the hollow 8 is not limited to barrel processing, but can also be formed by, for example, shot blast processing.

以上に示すように、本発明に係るトリポード型等速自在継手では、継手内部部材４が、トリポード部材５およびローラ７のみで構成される。そのため、トリポード部材、内側ローラ、多数の針状ころ、外側ローラ、およびワッシャといった数多くの部材で継手内部部材を構成していた従来構成に比べ、部品点数を大幅に削減することができ、部品管理工数や組み立て工数の削減を通じて低コストなトリポード型等速自在継手を提供することができる。   As described above, in the tripod type constant velocity universal joint according to the present invention, the joint inner member 4 is composed only of the tripod member 5 and the roller 7. Therefore, the number of parts can be greatly reduced compared to the conventional configuration in which the joint internal member is composed of a large number of members such as tripod members, inner rollers, many needle rollers, outer rollers, and washers. A low-cost tripod type constant velocity universal joint can be provided through reduction in man-hours and assembly man-hours.

このように、針状ころを廃止した本発明にかかるトリポード型等速自在継手では、脚軸６とローラ７とが滑り接触状態となるため、継手作動時に大きな摺動抵抗や転がり抵抗が発生し易くなる。このような抵抗の増大は振動や騒音等の発生原因となり、自動車のＮＶＨ性能に悪影響を及ぼすおそれが、ひいては継手の耐久寿命を低下させるおそれがある。   Thus, in the tripod type constant velocity universal joint according to the present invention in which the needle rollers are eliminated, the leg shaft 6 and the roller 7 are in a sliding contact state, so that a large sliding resistance or rolling resistance is generated during the operation of the joint. It becomes easy. Such an increase in resistance causes generation of vibrations, noises, and the like, which may adversely affect the NVH performance of the automobile, and thus may reduce the durability life of the joint.

この点、本実施形態に係るトリポード型等速自在継手では、脚軸６の外周面に、微小凹形状のくぼみ８をランダムに無数設けているので、くぼみ８で潤滑剤が安定的に保持され、両面間に潤滑膜が形成され易くなる。そのため、両面間での摩擦抵抗を軽減することができ、ＮＶＨ性能に悪影響が及ぶのを抑制あるいは防止することができる。また、潤滑不良に起因した焼付きの発生を防止することもできる。かかる構成を採用することでくぼみ８の形成工程が追加されることとなるが、部品点数削減によるコスト低減効果が十分に勝るため、全体としては十分な低コスト化が図られる。   In this regard, in the tripod type constant velocity universal joint according to the present embodiment, an infinite number of minute concave recesses 8 are provided on the outer peripheral surface of the leg shaft 6, so that the lubricant is stably held in the recesses 8. A lubricating film is easily formed between both surfaces. Therefore, frictional resistance between both surfaces can be reduced, and adverse effects on NVH performance can be suppressed or prevented. Moreover, the occurrence of seizure due to poor lubrication can also be prevented. By adopting such a configuration, the step of forming the recess 8 is added, but the cost reduction effect due to the reduction in the number of parts is sufficiently superior, so that the cost can be sufficiently reduced as a whole.

ところで、この種のトリポード型等速自在継手は、図３（ａ）に示すように外側継手部材１と継手内部部材４とが作動角をとった状態で回転力を伝達する場合があり、この場合、図１に示すトリポード型等速自在継手の構成では、ローラ７とローラ案内面３とが、図３（ｂ）に示すように相互に斜交する関係となる。このとき、ローラ７は、図３（ａ）に矢印ｔ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２は継手の軸線と平行な円筒面の一部であるため、ローラ７はトラック溝２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３とローラ７の相互間に発生する滑りに起因してスライド抵抗、さらには誘起スラストが発生し、自動車のＮＶＨ性能を低下させるおそれがある。かかる事態は、対向する脚軸６の外周面およびローラ７の内周面の双方が、脚軸６の軸線と平行なストレート形状に形成されているために生じる。   By the way, this kind of tripod type constant velocity universal joint may transmit a rotational force in a state where the outer joint member 1 and the joint inner member 4 take an operating angle as shown in FIG. In this case, in the configuration of the tripod type constant velocity universal joint shown in FIG. 1, the roller 7 and the roller guide surface 3 are in an oblique relationship with each other as shown in FIG. At this time, the roller 7 tries to roll in the direction indicated by the arrow t in FIG. 3A, whereas the track groove 2 is a part of a cylindrical surface parallel to the axis of the joint. Moves while being restrained by the track groove 2. As a result, sliding resistance and further induced thrust are generated due to the slip generated between the roller guide surface 3 and the roller 7, and there is a possibility that the NVH performance of the automobile is deteriorated. Such a situation occurs because both the outer peripheral surface of the leg shaft 6 and the inner peripheral surface of the roller 7 that are opposed to each other are formed in a straight shape parallel to the axis of the leg shaft 6.

図４は、上記の問題点を解消し得るトリポード型等速自在継手の一構成例を示すものであり、本発明に係るトリポード型等速自在継手の第２実施形態を示すものである。   FIG. 4 shows an example of the configuration of a tripod type constant velocity universal joint that can solve the above-mentioned problems, and shows a second embodiment of the tripod type constant velocity universal joint according to the present invention.

同図に示すトリポード型等速自在継手が、図１に示すものと異なる主な点は、図４（ａ）に示す継手の縦断面において、トリポード部材５の脚軸１６の外周面が、対向するローラ７の内周面側に突出した円弧状凸断面に形成されている（脚軸１６の外周面の母線が凸円弧に形成されている）点、および図４（ｂ）に示すように、脚軸１６の横断面（脚軸１６の軸線と直交する断面）形状が、継手の軸線と直交する方向に長軸を有する略楕円形状に形成され、脚軸１６の外周面とローラ７の内周面とが、継手の軸線と直交する方向で接触し、継手の軸線方向で非接触とされている点にある。   The main difference of the tripod type constant velocity universal joint shown in FIG. 1 from that shown in FIG. 1 is that the outer peripheral surface of the leg shaft 16 of the tripod member 5 is opposed to the longitudinal section of the joint shown in FIG. As shown in FIG. 4 (b), it is formed in an arcuate convex cross section projecting toward the inner peripheral surface side of the roller 7 (the generatrix of the outer peripheral surface of the leg shaft 16 is formed in a convex arc). The cross section of the leg shaft 16 (cross section orthogonal to the axis of the leg shaft 16) is formed into a substantially elliptical shape having a long axis in the direction orthogonal to the axis of the joint. The inner peripheral surface is in contact with the joint in the direction orthogonal to the joint axis, and is not in contact with the joint in the axial direction.

かかる構成を採用することにより、ローラ７が脚軸１６に対して首振り揺動自在（ローラ７が脚軸１６に対して傾動および軸方向変位自在）となる。そのため、図３（ａ）に示す態様で外側継手部材１と継手内部部材４とが作動角をとった状態で回転力伝達を行うとき、ローラ７とローラ案内面３とが図３（ｂ）に示す斜交状態となることを回避することができ、ローラ７は外側継手部材１の軸線と平行な姿勢を保つようにしてローラ案内面３によって案内され、そのままの姿勢でローラ案内面３上を正しく転動する。従って、作動角運転時における滑り抵抗が軽減され、スライド抵抗と誘起スラストの発生が効果的に抑制あるいは防止される。   By adopting such a configuration, the roller 7 can swing and swing with respect to the leg shaft 16 (the roller 7 can be tilted and axially displaced with respect to the leg shaft 16). Therefore, when the outer joint member 1 and the joint inner member 4 perform the rotational force transmission in the state shown in FIG. 3A, the roller 7 and the roller guide surface 3 are connected to each other as shown in FIG. The roller 7 is guided by the roller guide surface 3 so as to maintain a posture parallel to the axis of the outer joint member 1, and remains on the roller guide surface 3 as it is. Roll correctly. Accordingly, slip resistance during operation angle operation is reduced, and generation of slide resistance and induced thrust is effectively suppressed or prevented.

なお、本実施形態では、ローラ７の内周面と対向する脚軸１６の外周面に、微小凹形状のくぼみ８がランダムに無数設けられている。また、本実施形態では、脚軸１６の横断面形状を、継手の軸線と直交する方向に長軸を有する略楕円形に形成しているが、脚軸１６の横断面形状は真円形状に形成することもできる（図示省略）。これ以外の構成は、図１に示す実施形態に準ずるので、共通の参照番号を付して重複説明を省略する。   In this embodiment, an infinite number of minute concave recesses 8 are randomly provided on the outer peripheral surface of the leg shaft 16 facing the inner peripheral surface of the roller 7. Further, in this embodiment, the cross-sectional shape of the leg shaft 16 is formed in a substantially elliptical shape having a long axis in a direction orthogonal to the axis of the joint, but the cross-sectional shape of the leg shaft 16 is a perfect circle shape. It can also be formed (not shown). Since the configuration other than this is in accordance with the embodiment shown in FIG. 1, a common reference number is assigned and redundant description is omitted.

図５は、本発明に係るトリポード型等速自在継手の第３実施形態を示すものである。同図に示すトリポード型等速自在継手が図１に示すものと異なる主な点は、図５（ａ）に示すように、ローラ２７の内周面が、対向する脚軸２６の外周面側に突出した円弧状凸断面に形成されている（ローラ２７の内周面の母線が凸円弧に形成されている）点、および図５（ｂ）に示すように、脚軸２６の横断面（脚軸２６の軸線と直交する断面）形状が、継手の軸線と直交する方向に長軸を有する略楕円形状に形成され、脚軸２６の外周面とローラ２７の内周面とが継手の軸線と直交する方向で接触し、継手の軸線方向で非接触とされている点にある。かかる構成であっても、図４に示す構成と同様に、外側継手部材１と継手内部部材４とが作動角をとった状態で回転力伝達を行うときに懸念されるスライド抵抗と誘起スラストの発生が効果的に抑制あるいは防止される。   FIG. 5 shows a third embodiment of a tripod type constant velocity universal joint according to the present invention. The main difference between the tripod type constant velocity universal joint shown in FIG. 1 and that shown in FIG. 1 is that the inner peripheral surface of the roller 27 is on the outer peripheral surface side of the opposing leg shaft 26 as shown in FIG. And the cross section of the leg shaft 26 (as shown in FIG. 5 (b)). The cross-section perpendicular to the axis of the leg shaft 26 is formed into a substantially elliptical shape having a long axis in a direction perpendicular to the axis of the joint, and the outer peripheral surface of the leg shaft 26 and the inner peripheral surface of the roller 27 are the axis of the joint. It is in the point which is made to contact in the direction orthogonal to and non-contact in the axial direction of the joint. Even in such a configuration, similar to the configuration shown in FIG. 4, the slide resistance and induced thrust that are concerned when the outer joint member 1 and the joint inner member 4 transmit the rotational force with the operating angle taken. Generation is effectively suppressed or prevented.

なお、ローラ２７の内周面と対向する脚軸２６の外周面には、微小凹形状のくぼみ８がランダムに無数設けられている。また、上記同様に、脚軸２６の横断面形状は真円形状に形成することもできる（図示省略）。これ以外の構成は、図１に示す実施形態に準ずるので、共通の参照番号を付して重複説明を省略する。   It should be noted that an infinite number of minute concave recesses 8 are randomly provided on the outer peripheral surface of the leg shaft 26 facing the inner peripheral surface of the roller 27. Similarly to the above, the cross-sectional shape of the leg shaft 26 can also be formed in a perfect circle shape (not shown). Since the configuration other than this is in accordance with the embodiment shown in FIG. 1, a common reference number is assigned and redundant description is omitted.

以上の説明では、微小凹形状のくぼみ８を脚軸の外周面にランダムに無数設けた構成を例示しているが、くぼみ８は、脚軸の外周面に対向するローラの内周面に設けてもよい。またくぼみ８は、相互に対向する脚軸の外周面およびローラの内周面の双方に設けることもできる。   In the above description, a configuration in which a myriad of minute concave recesses 8 are randomly provided on the outer peripheral surface of the leg shaft is illustrated. However, the recess 8 is provided on the inner peripheral surface of the roller facing the outer peripheral surface of the leg shaft. May be. The recesses 8 can also be provided on both the outer peripheral surface of the leg shaft and the inner peripheral surface of the roller facing each other.

以上、本発明について説明を行ったが、本発明は上述した実施形態に何ら限定されるものでなく、本発明の要旨を逸脱しない範囲において、さらに種々なる形態で実施し得ることは勿論のことである。本発明の範囲は、特許請求の範囲によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内の全ての変更を含む。   The present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can of course be implemented in various forms without departing from the gist of the present invention. It is. The scope of the present invention is defined by the terms of the claims, and includes the equivalent meanings recited in the claims and all modifications within the scope.

本発明に係るトリポード型等速自在継手の第１実施形態を示すもので、（ａ）図は継手の横断面図、（ｂ）図は継手の縦断面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of a tripod constant velocity universal joint according to the present invention, wherein (a) is a cross-sectional view of the joint, and (b) is a longitudinal cross-sectional view of the joint. 図１のトリポード部材を示す図である。It is a figure which shows the tripod member of FIG. （ａ）図は図１に示すトリポード型等速自在継手が作動角をとった状態の縦断面図、（ｂ）図は（ａ）図におけるローラとローラ案内面との相互関係を示す模式的斜視図である。(A) is a longitudinal sectional view of the tripod type constant velocity universal joint shown in FIG. 1 at an operating angle, and (b) is a schematic diagram showing the mutual relationship between the roller and the roller guide surface in FIG. It is a perspective view. 本発明に係るトリポード型等速自在継手の第２実施形態を示すもので、（ａ）図は継手の縦断面図、（ｂ）図は（ａ）図におけるローラと脚軸の横断面図である。2 shows a second embodiment of the tripod type constant velocity universal joint according to the present invention, wherein (a) is a longitudinal sectional view of the joint, and (b) is a transverse sectional view of the roller and the leg shaft in FIG. is there. 本発明に係るトリポード型等速自在継手の第３実施形態を示すもので、（ａ）図は継手の縦断面図、（ｂ）図は（ａ）図におけるローラと脚軸の横断面図である。FIG. 3 shows a third embodiment of the tripod type constant velocity universal joint according to the present invention, wherein (a) is a longitudinal sectional view of the joint, and (b) is a transverse sectional view of the roller and the leg shaft in FIG. is there. 従来構成のトリポード型等速自在継手の一例を示すもので、（ａ）図は継手の横断面図、（ｂ）図は（ａ）図におけるローラアセンブリの横断面図である。An example of the tripod type constant velocity universal joint of the conventional structure is shown, (a) A figure is a cross-sectional view of a joint, (b) A figure is a cross-sectional view of the roller assembly in (a) figure.

符号の説明Explanation of symbols

１ 外側継手部材
２ トラック溝
３ ローラ案内面
４ 内部継手部材
５ トリポード部材
６，１６，２６ 脚軸
７，２７ ローラ
８ くぼみ DESCRIPTION OF SYMBOLS 1 Outer joint member 2 Track groove 3 Roller guide surface 4 Internal joint member 5 Tripod member 6, 16, 26 Leg shaft 7, 27 Roller 8 Indentation

Claims (5)

内径面の円周方向三等分位置に、軸線方向に延在するトラック溝が形成された外側継手部材と、潤滑剤の介在下で、前記外側継手部材に対して相対的に角度変位および軸方向変位可能に設けられた継手内部部材とを備えるトリポード型等速自在継手であって、
前記継手内部部材は、前記トラック溝に向かって突出した脚軸を有するトリポード部材と、前記脚軸に回転自在に外嵌され、前記トラック溝に収容されたローラとからなり、
かつ、相互に対向する前記脚軸の外周面および前記ローラの内周面のうち、少なくとも何れか一方に微小凹形状のくぼみがランダムに無数設けられていることを特徴とするトリポード型等速自在継手。 An outer joint member in which a track groove extending in the axial direction is formed at a position equally divided in three in the circumferential direction of the inner diameter surface, and an angular displacement and a shaft relative to the outer joint member with the presence of a lubricant. A tripod type constant velocity universal joint provided with a joint internal member provided so as to be capable of directional displacement,
The joint inner member includes a tripod member having a leg shaft protruding toward the track groove, and a roller that is rotatably fitted to the leg shaft and is accommodated in the track groove.
In addition, at least one of the outer peripheral surface of the leg shaft and the inner peripheral surface of the roller facing each other is provided with an infinite number of minute concave recesses, and the tripod type constant velocity free Fittings. 前記くぼみを、バレル加工で形成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。   The tripod type constant velocity universal joint according to claim 1, wherein the recess is formed by barrel processing. 前記くぼみを、ショットブラストで形成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。   The tripod type constant velocity universal joint according to claim 1, wherein the recess is formed by shot blasting. 継手の縦断面において、相互に対向する前記脚軸の外周面あるいは前記ローラの内周面の何れか一方を、相手部材側に突出した円弧状凸断面に形成すると共に、他方を前記脚軸の軸線と平行なストレート形状に形成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。   In the longitudinal cross section of the joint, either the outer peripheral surface of the leg shaft or the inner peripheral surface of the roller facing each other is formed in an arc-shaped convex cross section protruding toward the counterpart member, and the other is formed on the leg shaft. The tripod type constant velocity universal joint according to claim 1, wherein the tripod type constant velocity universal joint is formed in a straight shape parallel to the axis. 前記脚軸の外周面と前記ローラの内周面とが、前記脚軸の軸線と直交する断面で、継手の軸線と直交する方向で接触し、継手の軸線方向で非接触であることを特徴とする請求項４に記載のトリポード型等速自在継手。   The outer peripheral surface of the leg shaft and the inner peripheral surface of the roller are in a cross section orthogonal to the axis of the leg shaft, contact in a direction orthogonal to the joint axis, and non-contact in the joint axial direction. The tripod type constant velocity universal joint according to claim 4.
JP2007012705A 2007-01-23 2007-01-23 Tripod type constant velocity universal joint Expired - Fee Related JP4943169B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4950642A (en) * 1972-09-21 1974-05-16
JP2005054835A (en) * 2003-07-31 2005-03-03 Ntn Corp Tripod type constant velocity universal joint
JP2006275238A (en) * 2005-03-30 2006-10-12 Ntn Corp Tripod type constant velocity universal joint

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4950642A (en) * 1972-09-21 1974-05-16
JP2005054835A (en) * 2003-07-31 2005-03-03 Ntn Corp Tripod type constant velocity universal joint
JP2006275238A (en) * 2005-03-30 2006-10-12 Ntn Corp Tripod type constant velocity universal joint

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