JP2020148282A - Outside joint member for constant velocity universal joint - Google Patents

Outside joint member for constant velocity universal joint Download PDF

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JP2020148282A
JP2020148282A JP2019047210A JP2019047210A JP2020148282A JP 2020148282 A JP2020148282 A JP 2020148282A JP 2019047210 A JP2019047210 A JP 2019047210A JP 2019047210 A JP2019047210 A JP 2019047210A JP 2020148282 A JP2020148282 A JP 2020148282A
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tubular portion
constant velocity
velocity universal
diameter surface
universal joint
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JP7142593B2 (en
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昌矢 井上
Masaya Inoue
昌矢 井上
輝明 藤尾
Teruaki Fujio
輝明 藤尾
雅司 船橋
Masashi Funabashi
雅司 船橋
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NTN Corp
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NTN Toyo Bearing Co Ltd
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Abstract

To provide an outside joint member that has desired torque transmission performance but can effectively prevent electric erosion in a constant velocity universal joint.SOLUTION: An outside joint member 4 includes an insulation member 33 formed of an insulation material and interposed between a first metal member 31 with a guide groove 21 and a second metal member 32 with a spline 23. The insulation member 33 is rotatable together with the first member 31 and the second member 32 while holding the first member 31 and the second member 32 in a non-contact manner.SELECTED DRAWING: Figure 2

Description

本発明は、例えば、自動車や各種産業機械などの動力伝達系に組み込んで使用され、駆動側と従動側の二軸間で回転動力を等速で伝達する等速自在継手の外側継手部材に関する。 The present invention relates to, for example, an outer joint member of a constant velocity universal joint which is used by being incorporated in a power transmission system of an automobile or various industrial machines and transmits rotational power at a constant velocity between two shafts on a driving side and a driven side.

周知のように、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、角度変位および軸方向変位を許容する摺動式等速自在継手とに大別される。等速自在継手は、固定式であるか摺動式であるかに関わらず、カップ部および軸部を有し、カップ部の内径面に複数の案内溝が設けられた外側継手部材と、上記カップ部の内周に収容される内側継手部材やトルク伝達部材などの継手内部部品とを主要な構成部材として備える。 As is well known, constant velocity universal joints are roughly classified into fixed constant velocity universal joints that allow only angular displacement and sliding constant velocity universal joints that allow angular displacement and axial displacement. The constant velocity universal joint has a cup portion and a shaft portion regardless of whether it is a fixed type or a sliding type, and has an outer joint member having a plurality of guide grooves on the inner diameter surface of the cup portion, and the above. A joint internal component such as an inner joint member and a torque transmission member housed in the inner circumference of the cup portion is provided as a main component.

ところで、自動車や各種産業機械には多くの電気機器が装着されており、電源（バッテリー）や電気系統などから漏洩した電流が等速自在継手に流れ込んでくる可能性がある。例えば図７に模式的に示すような電気自動車１００、すなわち、バッテリー１０１から供給される電流Ｅによってモータ１０２が駆動され、その回転動力を受けて動力伝達装置としてのドライブシャフト１０３、さらには駆動輪（前輪）１０４が回転駆動される電気自動車１００において、バッテリー１０１から供給される電流Ｅの一部がモータ１０２から漏洩すると、その漏洩電流Ｅ’は、図８に示すように、図示外の他部材（例えば、差動装置のサイドギヤ）を介してドライブシャフト１０３を構成する摺動式等速自在継手（図示例はトリポード型等速自在継手）１１０の外側継手部材１１１に流れ込み、以降、トルク伝達部材（ローラ）１１２→内側継手部材（トリポード部材）１１３→中間シャフト１１５→固定式等速自在継手１２０の内側継手部材１２３→トルク伝達部材（ボール）１２２→外側継手部材１２１の順に流れていく。 By the way, many electric devices are installed in automobiles and various industrial machines, and there is a possibility that current leaked from a power source (battery) or an electric system may flow into a constant velocity universal joint. For example, the electric motor 100 as schematically shown in FIG. 7, that is, the motor 102 is driven by the current E supplied from the battery 101, and the drive shaft 103 as a power transmission device and the drive wheels further receive the rotational power. In the electric vehicle 100 in which the (front wheel) 104 is rotationally driven, when a part of the current E supplied from the battery 101 leaks from the motor 102, the leak current E'is not shown in the figure, as shown in FIG. It flows into the outer joint member 111 of the sliding type constant velocity universal joint (the illustrated example is a tripod type constant velocity universal joint) 110 constituting the drive shaft 103 via a member (for example, the side gear of the differential device), and thereafter torque is transmitted. The flow flows in the order of member (roller) 112 → inner joint member (tripode member) 113 → intermediate shaft 115 → inner joint member 123 of the fixed constant velocity universal joint 120 → torque transmission member (ball) 122 → outer joint member 121.

また、図示は省略するが、例えば駆動輪に制動力を付与するためのブレーキに電動ブレーキが装着された自動車において、電動ブレーキに供給される電流の一部が漏洩すると、その漏洩電流が上記とは逆の経路を辿ってドライブシャフト内を流れるおそれがある。 Although not shown, for example, in an automobile in which an electric brake is attached to a brake for applying a braking force to the drive wheels, if a part of the current supplied to the electric brake leaks, the leaked current is as described above. May follow the opposite path and flow through the drive shaft.

上記のようにしてドライブシャフト内を漏洩電流（以下、単に「電流」という）が流れた場合には、例えば、外側継手部材と他部材との接触部や、外側継手部材（および内側継手部材）とトルク伝達部材との接触部等で発生するスパークによって電食が生じ、等速自在継手の耐久寿命が著しく低下するおそれがある。そして、近年、自動車の電動化が急速に進展し、等速自在継手に電流が流れ込む可能性が増している関係上、等速自在継手に適切な電食防止対策を講じることが急務となっている。 When a leakage current (hereinafter, simply referred to as "current") flows through the drive shaft as described above, for example, a contact portion between the outer joint member and another member, or an outer joint member (and an inner joint member). Electrolytic corrosion may occur due to sparks generated at the contact portion between the and the torque transmission member, and the durable life of the constant velocity universal joint may be significantly shortened. In recent years, the electrification of automobiles has progressed rapidly, and the possibility of current flowing into the constant velocity universal joint has increased. Therefore, it is urgent to take appropriate electrolytic corrosion prevention measures for the constant velocity universal joint. There is.

そこで、本発明者らは、等速自在継手のうち、継手外部からの電流の入力対象である外側継手部材で電流の流通を阻止するようにすれば、等速自在継手の電食を防止する上で有効であると考えた。なお、電流が外側継手部材を流通するのを阻止するための技術手段としては、例えば下記の特許文献１に開示されたものが公知である。すなわち、特許文献１には、外側継手部材に設けられる案内溝の表面を絶縁材料としてのセラミックス材料で形成（案内溝をセラミックス被膜で被覆）することや、外側継手部材全体をセラミックス材料で形成することなどが記載されている。 Therefore, the present inventors prevent electrolytic corrosion of the constant-velocity universal joint by blocking the current flow at the outer joint member which is the target of input of the current from the outside of the joint among the constant-velocity universal joints. I thought it was effective above. As a technical means for preventing the current from flowing through the outer joint member, for example, those disclosed in Patent Document 1 below are known. That is, in Patent Document 1, the surface of the guide groove provided in the outer joint member is formed of a ceramic material as an insulating material (the guide groove is covered with a ceramic coating), or the entire outer joint member is formed of a ceramic material. That is described.

実開平６−２８３５１号公報Jikkenhei 6-28351

しかしながら、等速自在継手の運転時（外側継手部材と内側継手部材の間でのトルク伝達時）、案内溝の表面には高い面圧が繰り返し作用する。そのため、案内溝を被覆するセラミックス被膜は損傷・剥離等し易く、等速自在継手の電食を適切に防止することができない可能性がある。また、外側継手部材全体をセラミックス材料で形成した場合、外側継手部材が著しく高コスト化する他、外側継手部材に必要とされる機械的強度が不足し、等速自在継手のトルク伝達性能に悪影響を及ぼす可能性がある。 However, during operation of the constant velocity universal joint (when torque is transmitted between the outer joint member and the inner joint member), a high surface pressure repeatedly acts on the surface of the guide groove. Therefore, the ceramic coating covering the guide groove is easily damaged or peeled off, and there is a possibility that electrolytic corrosion of the constant velocity universal joint cannot be appropriately prevented. Further, when the entire outer joint member is made of a ceramic material, the cost of the outer joint member is significantly increased, and the mechanical strength required for the outer joint member is insufficient, which adversely affects the torque transmission performance of the constant velocity universal joint. May affect.

上記の実情に鑑み、本発明の目的は、必要とされるトルク伝達性能を具備するものでありながら、等速自在継手の電食を効果的に防止し得る外側継手部材を実現し、もって等速自在継手の耐久性および信頼性向上に寄与することにある。 In view of the above circumstances, an object of the present invention is to realize an outer joint member capable of effectively preventing electrolytic corrosion of a constant velocity universal joint while providing the required torque transmission performance. This is to contribute to improving the durability and reliability of the speed universal joint.

上記の目的を達成するために創案された本発明は、内径面にトルク伝達部材が転動する複数の案内溝が設けられたカップ部と、カップ部の底部から軸方向外向きに延びた軸部とを備え、軸部に、他部材をトルク伝達可能に連結するための連結要素が設けられた等速自在継手用外側継手部材において、上記複数の案内溝を有する金属製の第１部材と、上記連結要素を有する金属製の第２部材との間に絶縁材料で形成された絶縁部材が介在しており、絶縁部材は、第１部材と第２部材とを非接触に保持した状態で、第１部材および第２部材と一体回転可能であることを特徴とする。なお、本発明でいう「連結要素」としては、軸方向に延びる凸部（歯）と凹部（歯底）が周方向に交互に形成されたスプラインやセレーションを挙げることができる。 The present invention, which was devised to achieve the above object, has a cup portion provided with a plurality of guide grooves on the inner diameter surface on which a torque transmission member rolls, and a shaft extending outward in the axial direction from the bottom portion of the cup portion. In the outer joint member for a constant velocity universal joint, which is provided with a portion and a connecting element for connecting other members so that torque can be transmitted to the shaft portion, the first metal member having a plurality of guide grooves is used. An insulating member formed of an insulating material is interposed between the metal second member having the connecting element, and the insulating member holds the first member and the second member in a non-contact manner. , It is characterized in that it can rotate integrally with the first member and the second member. Examples of the "connecting element" in the present invention include splines and serrations in which convex portions (teeth) and concave portions (tooth bases) extending in the axial direction are alternately formed in the circumferential direction.

上記構成によれば、連結要素（を有する第２部材）を介して外側継手部材に電流が入力されても、第１部材と第２部材の間に介在し、両者を非接触に保持した絶縁部材によって、第２部材から第１部材への電流伝達が阻止される。これにより、案内溝を有する第１部材からトルク伝達部材への電流伝達、さらにはトルク伝達部材から内側継手部材への電流伝達等も当然に阻止することができるので、等速自在継手の電食を効果的に防止することができる。その一方、トルク伝達部材が転動する複数の案内溝およびトルク伝達用の連結要素は金属製の第１部材および第２部材にそれぞれ設けられ、また、絶縁部材は第１部材および第２部材と一体回転可能であることから、外側継手部材に必要とされる機械的強度やトルク伝達性能は問題なく確保することができる。 According to the above configuration, even if a current is input to the outer joint member via the connecting element (the second member having the connecting element), the insulation is interposed between the first member and the second member and holds both in a non-contact manner. The member blocks the current transmission from the second member to the first member. As a result, it is possible to naturally prevent the current transmission from the first member having the guide groove to the torque transmission member, and further the current transmission from the torque transmission member to the inner joint member, so that the electrolytic corrosion of the constant velocity universal joint can be prevented. Can be effectively prevented. On the other hand, a plurality of guide grooves for rolling the torque transmission member and a connecting element for torque transmission are provided on the first and second metal members, respectively, and the insulating member is the first member and the second member. Since it can rotate integrally, the mechanical strength and torque transmission performance required for the outer joint member can be ensured without any problem.

上記構成において、第１部材、第２部材および絶縁部材は、何れも、カップ部を構成する筒状部を有するものとすることができる。この場合には、絶縁部材の筒状部の内径面を、内径面に複数の案内溝が設けられた第１部材の筒状部の外径面に嵌合し、第２部材の筒状部の内径面を、絶縁部材の筒状部の外径面に嵌合することができる。このとき、絶縁部材の筒状部の内径面およびこれに嵌合される第１部材の筒状部の外径面、並びに絶縁部材の筒状部の外径面およびこれに嵌合される第２部材の筒状部の内径面を（何れも）断面非真円形状に形成しておけば、第１部材と絶縁部材の相対回転、および絶縁部材と第２部材の相対回転を規制することができるので、安定したトルク伝達が可能となる。 In the above configuration, the first member, the second member, and the insulating member may all have a tubular portion constituting the cup portion. In this case, the inner diameter surface of the tubular portion of the insulating member is fitted to the outer diameter surface of the tubular portion of the first member provided with a plurality of guide grooves on the inner diameter surface, and the tubular portion of the second member is fitted. The inner diameter surface of the insulating member can be fitted to the outer diameter surface of the tubular portion of the insulating member. At this time, the inner diameter surface of the tubular portion of the insulating member, the outer diameter surface of the tubular portion of the first member fitted thereto, and the outer diameter surface of the tubular portion of the insulating member and the first member fitted therein. If the inner diameter surface of the tubular part of the two members is formed into a non-round cross section (both), the relative rotation of the first member and the insulating member and the relative rotation of the insulating member and the second member can be regulated. Therefore, stable torque transmission is possible.

本発明に係る外側継手部材には、第１部材の筒状部および絶縁部材の筒状部と軸方向で係合した第１係合部材と、絶縁部材の筒状部および第２部材の筒状部と軸方向で係合した第２係合部材とをさらに設けることができる。このようにすれば、第１部材と絶縁部材の軸方向の相対移動や、絶縁部材と第２部材の軸方向の相対移動を規制することができるので、等速自在継手の運転時に外側継手部材に作用する軸方向荷重により外側継手部材が分解等するのを防止することができる。 The outer joint member according to the present invention includes a first engaging member that is axially engaged with a tubular portion of the first member and a tubular portion of the insulating member, and a tubular portion of the insulating member and a cylinder of the second member. A second engaging member that is axially engaged with the shape portion can be further provided. In this way, the relative movement of the first member and the insulating member in the axial direction and the relative movement of the insulating member and the second member in the axial direction can be regulated, so that the outer joint member can be operated during the operation of the constant velocity universal joint. It is possible to prevent the outer joint member from being disassembled or the like due to the axial load acting on the outer joint member.

絶縁部材の筒状部および第２部材の筒状部の軸方向寸法は、第１部材の筒状部の軸方向寸法よりも小さくすることができる。このようにすれば、絶縁部材を設けたこと（外側継手部材を複数の部材で構成したこと）による外側継手部材の重量化を防止する上で有利となる。 The axial dimensions of the tubular portion of the insulating member and the tubular portion of the second member can be smaller than the axial dimensions of the tubular portion of the first member. In this way, it is advantageous in preventing the weight of the outer joint member from being increased due to the provision of the insulating member (the outer joint member is composed of a plurality of members).

以上から、本発明によれば、必要とされるトルク伝達性能を具備するものでありながら、等速自在継手の電食を効果的に防止し得る外側継手部材を実現することができる。これにより、等速自在継手の耐久性および信頼性を向上することができる。 From the above, according to the present invention, it is possible to realize an outer joint member capable of effectively preventing electrolytic corrosion of a constant velocity universal joint while having the required torque transmission performance. As a result, the durability and reliability of the constant velocity universal joint can be improved.

ドライブシャフトの一例を示す断面図である。It is sectional drawing which shows an example of a drive shaft. （ａ）図は、本発明の一実施形態に係る外側継手部材の横断面図[（ｂ）図のＡ−Ａ線断面図]、（ｂ）図は、同外側継手部材の縦断面図である。(A) is a cross-sectional view of the outer joint member according to the embodiment of the present invention [(b) is a cross-sectional view taken along the line AA], and (b) is a vertical cross-sectional view of the outer joint member. is there. 図２に示す外側継手部材の分解斜視図である。It is an exploded perspective view of the outer joint member shown in FIG. （ａ）図は、図２に示す外側継手部材を構成する第１部材と絶縁部材のアセンブリの縦断面図、（ｂ）図は、第２部材の縦断面図である。FIG. 2A is a vertical sectional view of an assembly of a first member and an insulating member constituting the outer joint member shown in FIG. 2, and FIG. 2B is a vertical sectional view of the second member. 本発明の他の実施形態に係る外側継手部材を構成する第１部材と絶縁部材のアセンブリの縦断面図である。It is a vertical cross-sectional view of the assembly of the 1st member and the insulating member which constitute the outer joint member which concerns on other embodiment of this invention. 本発明の他の実施形態に係る外側継手部材を構成する第２部材の縦断面図である。It is a vertical sectional view of the 2nd member which comprises the outer joint member which concerns on other embodiment of this invention. 電気自動車の概略図である。It is a schematic diagram of an electric vehicle. 従来のドライブシャフトに電流（漏洩電流）が流れる様子を説明するための図である。It is a figure for demonstrating how a current (leakage current) flows through a conventional drive shaft.

以下、本発明の実施の形態を図面（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 the drawings (FIGS. 1 to 6).

図１に、動力伝達装置の一種であるドライブシャフト１の一例を示す。このドライブシャフト１は、エンジンや電動モータ等の回転駆動源から出力される回転動力（トルク）を駆動輪に伝達するものであり、インボード側（図１の紙面右側）に配置される摺動式等速自在継手３と、アウトボード側（図１の紙面左側）に配置される固定式等速自在継手１０と、両等速自在継手３，１０をトルク伝達可能に連結する中間シャフト２とを備える。 FIG. 1 shows an example of a drive shaft 1 which is a kind of power transmission device. The drive shaft 1 transmits rotational power (torque) output from a rotational drive source such as an engine or an electric motor to the drive wheels, and is arranged on the inboard side (right side of the paper in FIG. 1). A type constant velocity universal joint 3, a fixed type constant velocity universal joint 10 arranged on the outboard side (left side of the paper in FIG. 1), and an intermediate shaft 2 that connects both constant velocity universal joints 3 and 10 so as to be able to transmit torque. To be equipped.

図１に示す摺動式等速自在継手３はいわゆるトリポード型であり、カップ部５および軸部６を有する外側継手部材４と、カップ部５の内周に収容された内側継手部材としてのトリポード部材８と、トルク伝達部材としてのローラ７とを備える。トリポード部材８には径方向に延びる脚軸が周方向等間隔で３本設けられており、各脚軸の外周にローラ７が１個ずつ回転自在に嵌合されている。 The sliding constant velocity universal joint 3 shown in FIG. 1 is a so-called tripod type, and is a tripod as an outer joint member 4 having a cup portion 5 and a shaft portion 6 and an inner joint member housed in the inner circumference of the cup portion 5. A member 8 and a roller 7 as a torque transmission member are provided. The tripod member 8 is provided with three leg shafts extending in the radial direction at equal intervals in the circumferential direction, and one roller 7 is rotatably fitted to the outer periphery of each leg shaft.

図１に示す固定式等速自在継手１０はいわゆるバーフィールド型であり、カップ部１２および軸部１３を有する外側継手部材１１と、カップ部１２の内周に収容された内側継手部材１４と、カップ部１２と内側継手部材１４の間に複数個配置されたトルク伝達部材としてのボール１５と、カップ部１２の内径面と内側継手部材１４の外径面の間に配置され、ボール１５を保持する保持器１６とを備える。この固定式等速自在継手１０には、アンダーカットフリー型等、他の形式の固定式等速自在継手が用いられる場合もある。 The fixed constant velocity universal joint 10 shown in FIG. 1 is a so-called barfield type, and includes an outer joint member 11 having a cup portion 12 and a shaft portion 13, an inner joint member 14 housed in the inner circumference of the cup portion 12, and an inner joint member 14. A plurality of balls 15 as torque transmission members arranged between the cup portion 12 and the inner joint member 14, and the balls 15 are arranged between the inner diameter surface of the cup portion 12 and the outer diameter surface of the inner joint member 14 to hold the balls 15. The cage 16 is provided. For the fixed constant velocity universal joint 10, other types of fixed constant velocity universal joints such as an undercut-free type may be used.

中間シャフト２のインボード側およびアウトボード側の端部外周面には雄スプラインがそれぞれ設けられている。インボード側の雄スプライン（図示せず）は、摺動式等速自在継手３のトリポード部材８の孔部に設けられた雌スプライン（図示せず）に嵌合され、また、アウトボード側の雄スプラインは、固定式等速自在継手１０の内側継手部材１４の孔部に設けられた雌スプラインに嵌合されている。係る構成により、トリポード部材８と中間シャフト２の間、および中間シャフト２と内側継手部材１４の間でトルクが伝達される。 Male splines are provided on the outer peripheral surfaces of the ends of the intermediate shaft 2 on the inboard side and the outboard side, respectively. The male spline (not shown) on the inboard side is fitted into the female spline (not shown) provided in the hole of the tripod member 8 of the sliding constant velocity universal joint 3, and is also fitted on the outboard side. The male spline is fitted to the female spline provided in the hole of the inner joint member 14 of the fixed constant velocity universal joint 10. With such a configuration, torque is transmitted between the tripod member 8 and the intermediate shaft 2 and between the intermediate shaft 2 and the inner joint member 14.

両等速自在継手３，１０の内部にはグリース等の潤滑剤が封入されている。潤滑剤の外部漏洩や継手外部からの異物侵入を防止するため、摺動式等速自在継手３の外側継手部材４と中間シャフト２の間、および固定式等速自在継手１０の外側継手部材１１と中間シャフト２の間には、筒状のブーツ９，１７がそれぞれ装着されている。 A lubricant such as grease is sealed inside the two constant velocity universal joints 3 and 10. In order to prevent the lubricant from leaking to the outside and foreign matter from entering the joint, the outer joint member 11 between the outer joint member 4 and the intermediate shaft 2 of the sliding constant velocity universal joint 3 and the outer joint member 11 of the fixed constant velocity universal joint 10. Cylindrical boots 9 and 17, respectively, are mounted between the intermediate shaft 2 and the intermediate shaft 2.

以下、本発明が適用された外側継手部材、ここでは、摺動式等速自在継手（トリポード型等速自在継手）３の外側継手部材４について詳細に説明する。 Hereinafter, the outer joint member 4 to which the present invention is applied, here, the outer joint member 4 of the sliding constant velocity universal joint (tripod type constant velocity universal joint) 3 will be described in detail.

図２（ｂ）に示すように、外側継手部材４は、有底筒状のカップ部５と、カップ部５の底部から軸方向外向きに延びた軸部６とを備える。軸部６の自由端側の外径面には、図示しない他部材（例えば、差動装置のサイドギヤ）と外側継手部材４とをトルク伝達可能に連結するための連結要素（ここでは雄スプライン）２３が形成されている。図２（ａ）に示すように、カップ部５の内径面には、ローラ７の転動を案内するための案内溝２１が周方向に離間した三箇所に形成されている。各案内溝２１は、互いに対向する一対のローラ案内面２２，２２を有し、ローラ案内面２２，２２も含めて軸方向に延びた直線状に形成されている。本実施形態のカップ部５は、断面非真円形状、より具体的には、大径部と小径部とを周方向で交互に三つずつ配して構成される花冠状とされ、各大径部の内径面で案内溝２１の溝底面が構成されている。 As shown in FIG. 2B, the outer joint member 4 includes a bottomed tubular cup portion 5 and a shaft portion 6 extending outward in the axial direction from the bottom portion of the cup portion 5. On the outer diameter surface on the free end side of the shaft portion 6, a connecting element (here, a male spline) for connecting another member (for example, a side gear of a differential device) and an outer joint member 4 (not shown) so as to be able to transmit torque. 23 is formed. As shown in FIG. 2A, guide grooves 21 for guiding the rolling of the roller 7 are formed at three locations separated in the circumferential direction on the inner diameter surface of the cup portion 5. Each guide groove 21 has a pair of roller guide surfaces 22 and 22 facing each other, and is formed in a linear shape extending in the axial direction including the roller guide surfaces 22 and 22. The cup portion 5 of the present embodiment has a non-perfect circular cross section, and more specifically, has a flower crown shape formed by arranging three large-diameter portions and three small-diameter portions alternately in the circumferential direction. The groove bottom surface of the guide groove 21 is formed by the inner diameter surface of the diameter portion.

図３にも示すように、本実施形態の外側継手部材４は、第１部材３１、第２部材３２および絶縁部材３３のアセンブリからなり、絶縁材料で形成された絶縁部材３３を介して金属製の第１部材３１と第２部材３２との間でトルクを伝達可能とした点に主たる特徴がある。上記の絶縁材料としては、高硬度で耐熱性や耐食性に優れたセラミックスが好ましく使用され、また、第１部材３１および第２部材３２を形成するための金属材料としては、例えば、加工性や焼入性が良好な炭素含有量０．２０〜０．６０ 質量％の鋼材（浸炭鋼、中炭素鋼、合金鋼など）が好ましく使用される。 As shown in FIG. 3, the outer joint member 4 of the present embodiment is composed of an assembly of the first member 31, the second member 32, and the insulating member 33, and is made of metal via the insulating member 33 formed of the insulating material. The main feature is that torque can be transmitted between the first member 31 and the second member 32. As the above-mentioned insulating material, ceramics having high hardness and excellent heat resistance and corrosion resistance are preferably used, and as the metal material for forming the first member 31 and the second member 32, for example, workability and quenching are used. Steel materials (carburized steel, medium carbon steel, alloy steel, etc.) having a carbon content of 0.25 to 0.60% by mass with good permeability are preferably used.

図２（ｂ）および図４（ａ）に示すように、第１部材３１は、内径面に案内溝２１が設けられた筒状部３１ａと、底部３１ｂとを一体に有する有底筒状に形成され、また、絶縁部材３３は、筒状部３３ａおよび底部３３ｂを一体に有する有底筒状に形成されている。図２（ａ）に示すように、第１部材３１の筒状部３１ａおよび絶縁部材３３の筒状部３３ａは、何れも、カップ部５の断面形状に倣った断面非真円形状（花冠状）に形成されており、同種の非真円形状に形成された筒状部３１ａの外径面に筒状部３３ａの内径面が嵌合されている。これにより、第１部材３１と絶縁部材３３が周方向（外側継手部材４の回転方向）で係合するので、両部材３１，３３が一体回転可能となる。なお、等速自在継手３の運転時における第１部材３１と絶縁部材３３の相対回転や軸方向の相対移動によるトルク伝達性能の低下を防止するため、絶縁部材３３の筒状部３３ａの内径面を、第１部材３１の筒状部３１ａの外径面に対して適宜の手段（例えば、圧入、接着、圧入接着等）で固定するようにしても良い。 As shown in FIGS. 2 (b) and 4 (a), the first member 31 has a bottomed tubular shape having a tubular portion 31a provided with a guide groove 21 on the inner diameter surface and a bottom portion 31b integrally. The insulating member 33 is formed in a bottomed tubular shape having a tubular portion 33a and a bottom portion 33b integrally. As shown in FIG. 2A, both the tubular portion 31a of the first member 31 and the tubular portion 33a of the insulating member 33 have a non-round cross-sectional shape (flower crown shape) that follows the cross-sectional shape of the cup portion 5. ), And the inner diameter surface of the tubular portion 33a is fitted to the outer diameter surface of the tubular portion 31a formed in the same type of non-perfect circular shape. As a result, the first member 31 and the insulating member 33 are engaged in the circumferential direction (rotational direction of the outer joint member 4), so that both members 31 and 33 can rotate integrally. In addition, in order to prevent deterioration of torque transmission performance due to relative rotation and axial relative movement of the first member 31 and the insulating member 33 during operation of the constant velocity universal joint 3, the inner diameter surface of the tubular portion 33a of the insulating member 33 May be fixed to the outer diameter surface of the tubular portion 31a of the first member 31 by an appropriate means (for example, press-fitting, bonding, press-fitting bonding, etc.).

図２（ｂ）および図４（ｂ）に示すように、第２部材３２は、筒状部３２ａおよび底部３２ｂを一体に有するカップ状部３２ｃと、軸部６とを一体に有する。図２（ａ）に示すように、筒状部３２ａは、カップ部５の断面形状に倣った断面非真円形状（花冠状）に形成されており、同種の非真円形状に形成された絶縁部材３３の筒状部３３ａの外径面に第２部材３２の筒状部３２ａの内径面が嵌合されている。これにより、絶縁部材３３と第２部材３２が周方向で係合するので、第２部材３２と絶縁部材３３、さらには第１部材３１、第２部材３２および絶縁部材３３が一体回転可能となる。なお、等速自在継手３の運転時における第２部材３２と絶縁部材３３の相対回転や軸方向の相対移動によるトルク伝達性能の低下を防止するため、第２部材３２の筒状部３２ａの内径面を、絶縁部材３３の筒状部３３ａの外径面に対して適宜の手段（例えば、圧入、接着、圧入接着等）で固定するようにしても良い。 As shown in FIGS. 2 (b) and 4 (b), the second member 32 integrally has a cup-shaped portion 32c having a tubular portion 32a and a bottom portion 32b, and a shaft portion 6. As shown in FIG. 2A, the tubular portion 32a is formed in a non-round cross-sectional shape (flower crown shape) that follows the cross-sectional shape of the cup portion 5, and is formed in the same non-round shape. The inner diameter surface of the tubular portion 32a of the second member 32 is fitted to the outer diameter surface of the tubular portion 33a of the insulating member 33. As a result, the insulating member 33 and the second member 32 are engaged with each other in the circumferential direction, so that the second member 32 and the insulating member 33, and further, the first member 31, the second member 32, and the insulating member 33 can rotate integrally. .. In addition, in order to prevent a decrease in torque transmission performance due to relative rotation or axial relative movement of the second member 32 and the insulating member 33 during operation of the constant velocity universal joint 3, the inner diameter of the tubular portion 32a of the second member 32 is prevented. The surface may be fixed to the outer diameter surface of the tubular portion 33a of the insulating member 33 by an appropriate means (for example, press-fitting, bonding, press-fitting bonding, etc.).

上記構成により、第１部材３１の筒状部３１ａと第２部材３２の筒状部３２ａとの間には絶縁部材３３の筒状部３３ａが介在し、第１部材３１の底部３１ｂと第２部材３２の底部３２ｂとの間には絶縁部材３３の底部３３ｂが介在するので、第１部材３１と第２部材３２は非接触の状態に保持される。 According to the above configuration, the tubular portion 33a of the insulating member 33 is interposed between the tubular portion 31a of the first member 31 and the tubular portion 32a of the second member 32, and the bottom portion 31b and the second portion of the first member 31 Since the bottom portion 33b of the insulating member 33 is interposed between the bottom portion 32b of the member 32, the first member 31 and the second member 32 are held in a non-contact state.

以上を小括すると、外側継手部材４においては、案内溝２１を有する金属製の第１部材３１と、他部材と外側継手部材４とをトルク伝達可能に連結するための連結要素（雄スプライン）２３を有する金属製の第２部材３２との間に絶縁材料で形成された絶縁部材３３が介在し、絶縁部材３３は、第１部材３１と第２部材３２とを非接触に保持した状態で第１部材３１および第２部材３２と一体回転可能とされている。 To summarize the above, in the outer joint member 4, a connecting element (male spline) for connecting the first metal member 31 having the guide groove 21 and the other member and the outer joint member 4 so as to be able to transmit torque. An insulating member 33 formed of an insulating material is interposed between the second member 32 made of metal having 23, and the insulating member 33 holds the first member 31 and the second member 32 in a non-contact manner. It is made rotatable integrally with the first member 31 and the second member 32.

このような構成によれば、他部材を介して外側継手部材４（を構成する第２部材３２）に電流が入力されても、第１部材３１と第２部材３２の間に介在する絶縁部材３３によって、第２部材３２から第１部材３１への電流伝達が阻止される。これにより、案内溝２１を有する第１部材３１からローラ７への電流伝達、さらにはローラ７からトリポード部材へ８の電流伝達等も阻止することができるので、等速自在継手４の電食を効果的に防止することができる。その一方、ローラ７が転動する案内溝２１および連結要素２３は金属製の第１部材３１および第２部材３２にそれぞれ設けられ、また、絶縁部材３３は第１部材３１および第２部材３２と一体回転可能であることから、外側継手部材４に必要とされる機械的強度やトルク伝達性能は問題なく確保することができる。 According to such a configuration, even if a current is input to the outer joint member 4 (the second member 32 constituting the outer joint member 4) via another member, the insulating member interposed between the first member 31 and the second member 32. By 33, the current transmission from the second member 32 to the first member 31 is blocked. As a result, the current transmission from the first member 31 having the guide groove 21 to the roller 7 and the current transmission from the roller 7 to the tripod member 8 can be prevented, so that the electrolytic corrosion of the constant velocity universal joint 4 can be prevented. It can be effectively prevented. On the other hand, the guide groove 21 on which the roller 7 rolls and the connecting element 23 are provided on the first metal member 31 and the second member 32, respectively, and the insulating member 33 is the first member 31 and the second member 32, respectively. Since it can rotate integrally, the mechanical strength and torque transmission performance required for the outer joint member 4 can be ensured without any problem.

従って、本発明によれば、必要とされるトルク伝達性能を具備するものでありながら、等速自在継手３の電食を効果的に防止し得る外側継手部材４を実現することができる。これにより、等速自在継手３の耐久性および信頼性を向上することができる。 Therefore, according to the present invention, it is possible to realize an outer joint member 4 capable of effectively preventing electrolytic corrosion of the constant velocity universal joint 3 while having the required torque transmission performance. Thereby, the durability and reliability of the constant velocity universal joint 3 can be improved.

図２（ｂ）、図３および図４（ａ）に示すように、本実施形態の外側継手部材４は、第１部材３１の筒状部３１ａおよび絶縁部材３３の筒状部３３ａと軸方向で係合した第１係合部材３４と、絶縁部材３３の筒状部３３ａおよび第２部材３２の筒状部３２ａと軸方向で係合した第２係合部材３５とをさらに有する。 As shown in FIGS. 2 (b), 3 and 4 (a), the outer joint member 4 of the present embodiment has the tubular portion 31a of the first member 31 and the tubular portion 33a of the insulating member 33 in the axial direction. Further has a first engaging member 34 engaged with the above, a tubular portion 33a of the insulating member 33, and a second engaging member 35 axially engaged with the tubular portion 32a of the second member 32.

第１係合部材３４は、周方向で有端のクリップ（いわゆるＣ型クリップ）で構成され、第１部材３１の筒状部３１ａの外径面に設けられた環状溝３１ｃと、環状溝３１ｃと対向するように絶縁部材３３の筒状部３３ａの内径面に設けられた環状溝３３ｃとで画成される環状の空隙に嵌合固定されている。また、第２係合部材３５は、第１係合部材３４と同様のＣ型クリップで構成され、絶縁部材３３の筒状部３３ａの外径面に設けられた環状溝３３ｄと、環状溝３３ｄと対向するように第２部材３２の筒状部３２ａの内径面に設けられた環状溝３２ｄとで画成される環状の空隙に嵌合固定されている。 The first engaging member 34 is composed of a clip having an end in the circumferential direction (so-called C-shaped clip), and has an annular groove 31c and an annular groove 31c provided on the outer diameter surface of the tubular portion 31a of the first member 31. It is fitted and fixed in an annular gap defined by an annular groove 33c provided on the inner diameter surface of the tubular portion 33a of the insulating member 33 so as to face the above. Further, the second engaging member 35 is composed of the same C-shaped clip as the first engaging member 34, and has an annular groove 33d and an annular groove 33d provided on the outer diameter surface of the tubular portion 33a of the insulating member 33. It is fitted and fixed in an annular gap defined by an annular groove 32d provided on the inner diameter surface of the tubular portion 32a of the second member 32 so as to face the surface.

外側継手部材４が上記の第１および第２係合部材３４，３５をさらに備えていることにより、外側継手部材４の組立時に必要となる第１部材３１と絶縁部材３３の軸方向の位置決め、および絶縁部材３３と第２部材３２の軸方向の位置決めを容易にかつ正確に行うことができ、また、外側継手部材４の組立完了後には、第１部材３１と絶縁部材３３、および絶縁部材３３と第２部材３２が軸方向に相対移動するのを効果的に防止することができる。これにより、複数部材からなる外側継手部材４のトルク伝達性能を向上することができるので、等速自在継手３の信頼性を一層高めることができる。 Since the outer joint member 4 further includes the above-mentioned first and second engaging members 34 and 35, the axial positioning of the first member 31 and the insulating member 33, which is required when assembling the outer joint member 4, Axial positioning of the insulating member 33 and the second member 32 can be easily and accurately performed, and after the assembly of the outer joint member 4 is completed, the first member 31, the insulating member 33, and the insulating member 33 can be easily and accurately positioned. And the second member 32 can be effectively prevented from moving relative to each other in the axial direction. As a result, the torque transmission performance of the outer joint member 4 composed of a plurality of members can be improved, so that the reliability of the constant velocity universal joint 3 can be further improved.

なお、本発明に係る外側継手部材４は、金属製の第１部材３１と第２部材３２の間に絶縁部材３３を介在させている関係上、絶縁部材３３を有さない金属製の外側継手部材に比べて重量化する可能性がある。外側継手部材が重量化すると、等速自在継手、さらにはドライブシャフトの重量化を招き、自動車の燃費（電費）を悪化させる懸念がある。そこで、本実施形態の外側継手部材４では、第２部材３２の筒状部３２ａおよび絶縁部材３３の筒状部３３ａの軸方向寸法を、第１部材３１の筒状部３１ａの軸方向寸法よりも小さくすることによって重量化を抑えている。 The outer joint member 4 according to the present invention is a metal outer joint that does not have the insulating member 33 because the insulating member 33 is interposed between the first metal member 31 and the second member 32. It may be heavier than the member. If the outer joint member becomes heavier, the constant velocity universal joint and the drive shaft become heavier, and there is a concern that the fuel consumption (electricity cost) of the automobile may be deteriorated. Therefore, in the outer joint member 4 of the present embodiment, the axial dimension of the tubular portion 32a of the second member 32 and the tubular portion 33a of the insulating member 33 is set from the axial dimension of the tubular portion 31a of the first member 31. The weight is suppressed by making it smaller.

以上、本発明の一実施形態に係る外側継手部材４について説明を行ったが、本発明の実施の形態はこれに限られない。 Although the outer joint member 4 according to the embodiment of the present invention has been described above, the embodiment of the present invention is not limited to this.

例えば、第１部材３１および絶縁部材３３は、図５に示すように、底部３１ｂ，３３ｂにその両端面に開口した孔部（貫通孔）を有するものに置き換えることが可能である。また、第２部材３２は、図６に示すように、底部３２ｂの内底面および軸部６の端面（自由端側の端面）に開口した孔部（貫通孔）を有し、等速自在継手３（外側継手部材４）と他部材とをトルク伝達可能に連結する連結要素２３が軸部６の内径面（孔部の内壁面）に設けられたものに置き換えることが可能である。 For example, as shown in FIG. 5, the first member 31 and the insulating member 33 can be replaced with those having holes (through holes) opened on both end surfaces of the bottoms 31b and 33b. Further, as shown in FIG. 6, the second member 32 has a hole (through hole) opened in the inner bottom surface of the bottom portion 32b and the end surface (end surface on the free end side) of the shaft portion 6, and is a constant velocity universal joint. The connecting element 23 for connecting the 3 (outer joint member 4) and the other member so as to be able to transmit torque can be replaced with one provided on the inner diameter surface (inner wall surface of the hole portion) of the shaft portion 6.

また、以上では、有底筒状に形成した絶縁部材３３を用いるようにしたが、絶縁部材３３は、第１部材３１と第２部材３２とを非接触の状態に保持しつつ、第１部材３１および第２部材３２と一体回転可能である限り、任意形状をとることが可能である。従って、図示は省略するが、絶縁部材３３は例えば円盤状に形成することも可能である。 Further, in the above, the insulating member 33 formed in the shape of a bottomed cylinder is used, but the insulating member 33 is the first member while keeping the first member 31 and the second member 32 in a non-contact state. As long as it can rotate integrally with the 31 and the second member 32, it can take any shape. Therefore, although not shown, the insulating member 33 can be formed in a disk shape, for example.

以上では、摺動式等速自在継手３のうち、トリポード型等速自在継手の外側継手部材４に本発明を適用した場合について説明したが、本発明は、他の形式の摺動式等速自在継手、例えばダブルオフセット型等速自在継手やクロスグルーブ型等速自在継手の外側継手部材に適用することも可能である。さらに、本発明は、摺動式等速自在継手の外側継手部材のみならず、固定式等速自在継手（例えば、図１に示すバーフィールド型やアンダーカットフリー型）の外側継手部材に適用することも可能である。 In the above, the case where the present invention is applied to the outer joint member 4 of the tripod type constant velocity universal joint among the sliding type constant velocity universal joint 3 has been described, but the present invention has described another type of sliding constant velocity universal joint. It can also be applied to a universal joint, for example, an outer joint member of a double offset type constant velocity universal joint or a cross groove type constant velocity universal joint. Further, the present invention is applied not only to the outer joint member of a sliding constant velocity universal joint, but also to the outer joint member of a fixed constant velocity universal joint (for example, Barfield type or undercut free type shown in FIG. 1). It is also possible.

本発明は前述した実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得る。すなわち、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、および範囲内のすべての変更を含む。 The present invention is not limited to the above-described embodiments, and can be further implemented in various forms without departing from the gist of the present invention. That is, the scope of the present invention is indicated by the scope of claims, and further includes the equal meaning described in the scope of claims, and all modifications within the scope.

１ ドライブシャフト
３ 摺動式等速自在継手
４ 外側継手部材
５ カップ部
６ 軸部
７ ローラ（トルク伝達部材）
３１ 第１部材
３１ａ 筒状部
３２ 第２部材
３２ａ 筒状部
３３ 絶縁部材
３３ａ 筒状部
３４ 第１係合部材
３５ 第２係合部材 1 Drive shaft 3 Sliding constant velocity universal joint 4 Outer joint member 5 Cup part 6 Shaft part 7 Roller (torque transmission member)
31 First member 31a Cylindrical part 32 Second member 32a Cylindrical part 33 Insulating member 33a Cylindrical part 34 First engaging member 35 Second engaging member

Claims (5)

内径面にトルク伝達部材が転動する複数の案内溝が設けられたカップ部と、該カップ部の底部から軸方向外向きに延びた軸部とを備え、該軸部に、他部材をトルク伝達可能に連結するための連結要素が設けられた等速自在継手用外側継手部材において、
前記複数の案内溝を有する金属製の第１部材と、前記連結要素を有する金属製の第２部材との間に絶縁材料で形成された絶縁部材が介在しており、
前記絶縁部材は、前記第１部材と前記第２部材とを非接触に保持した状態で、前記第１部材および前記第２部材と一体回転可能であることを特徴とする等速自在継手用外側継手部材。 A cup portion provided with a plurality of guide grooves on the inner diameter surface on which a torque transmission member rolls, and a shaft portion extending outward in the axial direction from the bottom portion of the cup portion are provided, and other members are torqued on the shaft portion. In the outer joint member for a constant velocity universal joint provided with a connecting element for transmittingly connecting
An insulating member formed of an insulating material is interposed between the first metal member having the plurality of guide grooves and the second metal member having the connecting element.
The insulating member is capable of integrally rotating with the first member and the second member in a state where the first member and the second member are held in a non-contact manner, and is an outer side for a constant velocity universal joint. Joint member. 前記第１部材、前記第２部材および前記絶縁部材は、何れも、前記カップ部を構成する筒状部を有し、
前記絶縁部材の筒状部の内径面が、内径面に前記複数の案内溝が設けられた前記第１部材の筒状部の外径面に嵌合され、前記第２部材の筒状部の内径面が、前記絶縁部材の筒状部の外径面に嵌合されている請求項１に記載の等速自在継手用外側継手部材。 The first member, the second member, and the insulating member all have a tubular portion that constitutes the cup portion.
The inner diameter surface of the tubular portion of the insulating member is fitted to the outer diameter surface of the tubular portion of the first member provided with the plurality of guide grooves on the inner diameter surface, and the tubular portion of the second member The outer joint member for a constant velocity universal joint according to claim 1, wherein the inner diameter surface is fitted to the outer diameter surface of the tubular portion of the insulating member. 前記絶縁部材の筒状部の内径面およびこれに嵌合される前記第１部材の筒状部の外径面、並びに前記絶縁部材の筒状部の外径面およびこれに嵌合される前記第２部材の筒状部の内径面が断面非真円形状に形成されている請求項２に記載の等速自在継手用外側継手部材。 The inner diameter surface of the tubular portion of the insulating member and the outer diameter surface of the tubular portion of the first member fitted thereto, and the outer diameter surface of the tubular portion of the insulating member and the fitting to be fitted thereto. The outer joint member for a constant velocity universal joint according to claim 2, wherein the inner diameter surface of the tubular portion of the second member is formed in a non-perfect circular cross section. 前記第１部材の筒状部および前記絶縁部材の筒状部と軸方向で係合した第１係合部材と、前記絶縁部材の筒状部および前記第２部材の筒状部と軸方向で係合した第２係合部材とをさらに備える請求項２又は３に記載の等速自在継手用外側継手部材。 Axial with the tubular portion of the first member, the first engaging member axially engaged with the tubular portion of the insulating member, the tubular portion of the insulating member, and the tubular portion of the second member. The outer joint member for a constant velocity universal joint according to claim 2 or 3, further comprising an engaged second engaging member. 前記絶縁部材の筒状部および前記第２部材の筒状部の軸方向寸法が、前記第１部材の筒状部の軸方向寸法よりも小さい請求項２〜４の何れか一項に記載の等速自在継手用外側継手部材。 The item according to any one of claims 2 to 4, wherein the axial dimension of the tubular portion of the insulating member and the tubular portion of the second member is smaller than the axial dimension of the tubular portion of the first member. Outer joint member for constant velocity universal joint.
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JPH03272322A (en) * 1990-02-19 1991-12-04 Ntn Corp Outer wheel for vibration isolating constant speed joint
JP2009293728A (en) * 2008-06-06 2009-12-17 Ntn Corp Constant velocity universal joint
JP2011226589A (en) * 2010-04-21 2011-11-10 Ntn Corp Tripod type constant velocity universal joint and outside joint member for the same
JP2016038048A (en) * 2014-08-08 2016-03-22 本田技研工業株式会社 Constant velocity joint and manufacturing method therefor

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Publication number Priority date Publication date Assignee Title
US6197656B1 (en) 1998-03-24 2001-03-06 International Business Machines Corporation Method of forming planar isolation and substrate contacts in SIMOX-SOI.

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH03272322A (en) * 1990-02-19 1991-12-04 Ntn Corp Outer wheel for vibration isolating constant speed joint
JP2009293728A (en) * 2008-06-06 2009-12-17 Ntn Corp Constant velocity universal joint
JP2011226589A (en) * 2010-04-21 2011-11-10 Ntn Corp Tripod type constant velocity universal joint and outside joint member for the same
JP2016038048A (en) * 2014-08-08 2016-03-22 本田技研工業株式会社 Constant velocity joint and manufacturing method therefor

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