JP5169476B2 - Grinding method of track groove of tripod type constant velocity universal joint - Google Patents

Grinding method of track groove of tripod type constant velocity universal joint Download PDF

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JP5169476B2
JP5169476B2 JP2008132146A JP2008132146A JP5169476B2 JP 5169476 B2 JP5169476 B2 JP 5169476B2 JP 2008132146 A JP2008132146 A JP 2008132146A JP 2008132146 A JP2008132146 A JP 2008132146A JP 5169476 B2 JP5169476 B2 JP 5169476B2
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track groove
rotating grindstone
outer member
universal joint
constant velocity
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JP2009279676A (en
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正一郎 西
雅 佐々木
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Toyota Motor Corp
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Description

本発明は、トリポード型等速自在継手のアウタ部材の内周面に形成されているトラック溝の研削方法に関する。特に、側面が湾曲しているトラック溝の研削方法に関する。   The present invention relates to a method for grinding a track groove formed on an inner peripheral surface of an outer member of a tripod type constant velocity universal joint. In particular, the present invention relates to a method for grinding a track groove having a curved side surface.

トリポード型等速自在継手は、円筒状の内周面を有するアウタ部材と、アウタ部材の内周面に嵌合するトリポード部材から構成されている。アウタ部材の内周面には、その長手方向に沿って伸びている３本のトラック溝が形成されている。トリポード部材は、ロッドと、ロッドの周方向に略等間隔で配置されており回転軸がロッドの半径方向に伸びている３つのローラを有している。トリポード部材の３つのローラが夫々アウタ部材のトラック溝に案内されて、アウタ部材とトリポード部材が嵌合している。
トリポード型等速自在継手では、トラック溝とローラのクリアランスが重要であるため、トラック溝を高精度に研削する技術が必要とされている。
トラック溝の側面が平坦である場合、特許文献１の第１図や第２図に例示されている技術を使って、回転砥石の側平面をトラック溝の側面に当接させて研削することができる。 The tripod type constant velocity universal joint includes an outer member having a cylindrical inner peripheral surface and a tripod member fitted to the inner peripheral surface of the outer member. Three track grooves extending along the longitudinal direction are formed on the inner peripheral surface of the outer member. The tripod member has a rod and three rollers which are arranged at substantially equal intervals in the circumferential direction of the rod and whose rotation shaft extends in the radial direction of the rod. The three rollers of the tripod member are respectively guided by the track grooves of the outer member, and the outer member and the tripod member are fitted.
In the tripod type constant velocity universal joint, since the clearance between the track groove and the roller is important, a technique for grinding the track groove with high accuracy is required.
When the side surface of the track groove is flat, grinding can be performed by bringing the side surface of the rotating grindstone into contact with the side surface of the track groove using the technique illustrated in FIGS. 1 and 2 of Patent Document 1. it can.

実開平３−８８６５３号公報Japanese Utility Model Publication No. 3-88653

図２に、トリポード型等速自在継手１００の断面図を示し、図３にトラック溝１２とローラ５２の嵌合部分の拡大図を示す。自在継手１００は、アウタ部材１０の内面に形成された３本のトラック溝１２の夫々に、トリポード部材５０の３つのローラ５２が案内されて、アウタ部材１０とトリポード部材５０が嵌合している。
図２、３に示したトリポード型等速自在継手１００では、アウタ部材１０の長手方向に交差する断面（横断面）から観測するとトラック溝１２の側面１４が湾曲している。ローラ５２も、ローラの回転軸を含む断面から観測してその外周面が湾曲している。自在継手１００では、湾曲した側面１４にローラ５２の外周面が当接する。アウタ部材１０の軸線とトリポード部材５０の軸線が一直線に並んでいるときは、ローラ５２の側面とトラック溝の底面１６の間に間隙が生じている。アウタ部材１０の軸線とトリポード部材５０の軸線が傾斜すると、ローラ５２の外周面とトラック溝１２の側面１４が当接するとともに、ローラ５２の側平面がトラック溝１２の底面１６に当接する。
アウタ部材１０の軸線とトリポード部材５０の軸線が傾斜しながら継手全体が円滑に回転するためには、ローラ５２の外周面とトラック溝１２の側面１４が適切に当接するとともに、ローラ５２の側平面とトラック溝１２の底面１６が適切に当接する必要がある。そのためには、トラック溝１２の側面１４と底面１６の幾何学的関係、特に図３の距離Ｌ（トラック溝１２の溝幅が最大となる位置Ｐとトラック溝１２の底面１６との間の距離）の精度が重要である。
図に示すように、トラック溝１２の側面１４が湾曲している場合、回転砥石の側平面でそのような側面１４を研削することができない。特許文献１に開示された研削方法は、断面が湾曲しているトラック溝の研削には適していない。
本発明は、横断面において側面が湾曲しているトラック溝に好適な研削方法を提供することを目的とする。 2 is a cross-sectional view of the tripod constant velocity universal joint 100, and FIG. 3 is an enlarged view of a fitting portion between the track groove 12 and the roller 52. In the universal joint 100, the three rollers 52 of the tripod member 50 are guided in the three track grooves 12 formed on the inner surface of the outer member 10, and the outer member 10 and the tripod member 50 are fitted. .
In the tripod type constant velocity universal joint 100 shown in FIGS. 2 and 3, the side surface 14 of the track groove 12 is curved when observed from a cross section (cross section) intersecting the longitudinal direction of the outer member 10. The roller 52 also has an outer peripheral surface that is curved as observed from a cross section including the rotation axis of the roller. In the universal joint 100, the outer peripheral surface of the roller 52 contacts the curved side surface 14. When the axis of the outer member 10 and the axis of the tripod member 50 are aligned, a gap is generated between the side surface of the roller 52 and the bottom surface 16 of the track groove. When the axis of the outer member 10 and the axis of the tripod member 50 are inclined, the outer peripheral surface of the roller 52 and the side surface 14 of the track groove 12 abut and the side plane of the roller 52 abuts the bottom surface 16 of the track groove 12.
In order for the entire joint to rotate smoothly while the axis of the outer member 10 and the axis of the tripod member 50 are inclined, the outer peripheral surface of the roller 52 and the side surface 14 of the track groove 12 are in proper contact with each other, and the side plane of the roller 52 It is necessary that the bottom surface 16 of the track groove 12 abuts properly. For this purpose, the geometrical relationship between the side surface 14 and the bottom surface 16 of the track groove 12, particularly the distance L in FIG. 3 (the distance between the position P at which the groove width of the track groove 12 is maximum and the bottom surface 16 of the track groove 12). ) Accuracy is important.
As shown in the figure, when the side surface 14 of the track groove 12 is curved, such a side surface 14 cannot be ground on the side surface of the rotating grindstone. The grinding method disclosed in Patent Document 1 is not suitable for grinding a track groove having a curved cross section.
An object of the present invention is to provide a grinding method suitable for a track groove whose side surface is curved in a cross section.

本発明は、円板状の回転砥石を、回転砥石の側平面をトラック溝の底面に対向させて配置し、回転砥石の外周面でトラック溝の側面を研削することを特徴とする。回転軸を含む断面における回転砥石の外周面をトラック溝の望ましい側面形状とすることによって、トラック溝の側面を所望の湾曲形状に研削することができる。   The present invention is characterized in that a disk-shaped rotating grindstone is disposed with the side surface of the rotating grindstone facing the bottom surface of the track groove, and the side surface of the track groove is ground by the outer peripheral surface of the rotating grindstone. By setting the outer peripheral surface of the rotating grindstone in the cross section including the rotation shaft to the desired side surface shape of the track groove, the side surface of the track groove can be ground into a desired curved shape.

本発明の研削方法では、回転砥石をアウタ部材の開口部から奥へ移動させながらトラック溝の底面を研削し、回転砥石をアウタ部材の奥から開口部へ移動させながら回転砥石の側平面でトラック溝の側面を研削することが好ましい。トラック溝の湾曲した側面だけでなく、平坦な底面も研削することができる。回転砥石の外周面と側平面に同時に負荷が加わらないので、トラック溝を高精度に研削することができる。即ち、上記した距離Ｌを高精度に仕上げることができる。さらに、回転砥石の１往復でトラック溝の側面と底面を研削することができるので、短時間でトラック溝の側面と底面を研削することができる。   In the grinding method of the present invention, the bottom surface of the track groove is ground while moving the rotating grindstone from the opening of the outer member to the back, and the track is moved on the side plane of the rotating grindstone while moving the rotating grindstone from the back of the outer member to the opening. It is preferable to grind the side surface of the groove. Not only the curved side surface of the track groove but also the flat bottom surface can be ground. Since no load is simultaneously applied to the outer peripheral surface and the side plane of the rotating grindstone, the track grooves can be ground with high accuracy. That is, the above-described distance L can be finished with high accuracy. Furthermore, since the side surface and bottom surface of the track groove can be ground by one reciprocation of the rotating grindstone, the side surface and bottom surface of the track groove can be ground in a short time.

本発明によれば、トリポード型等速自在継手のアウタ部材において、横断面において側面が湾曲しているトラック溝を精密に研削することができる。   According to the present invention, in the outer member of the tripod type constant velocity universal joint, the track groove whose side surface is curved in the cross section can be precisely ground.

図面を参照して、本発明に係る研削方法を説明する。図１は、研削装置２０を使ってアウタ部材１０の内面に形成されたトラック溝１２を研削する様子を示している。図１（Ａ）は、アウタ部材１０の長手方向に交差する断面、即ち横断面を示しており、図１（Ｂ）はアウタ部材１０の長手方向に沿った断面、即ち縦断面を示している。   A grinding method according to the present invention will be described with reference to the drawings. FIG. 1 shows a state in which the track groove 12 formed on the inner surface of the outer member 10 is ground using the grinding device 20. FIG. 1A shows a cross section that intersects the longitudinal direction of the outer member 10, that is, a transverse section, and FIG. 1B shows a cross section that follows the longitudinal direction of the outer member 10, that is, a longitudinal section. .

アウタ部材１０の内面に、３本のトラック溝１２が形成されている。夫々のトラック溝１２は、アウタ部材１０の内面に長手方向に伸びている。夫々のトラック溝１２は、図１（Ａ）（横断面）において湾曲している側面１４ａ、１４ｂと、平坦な底面１６から形成されている。底面１６のうち、溝幅方向の中央部１７は側方よりも窪んでいる。なお、一方の側面１４ａと他方の側面１４ｂとの間の距離を溝幅と称する。   Three track grooves 12 are formed on the inner surface of the outer member 10. Each track groove 12 extends in the longitudinal direction on the inner surface of the outer member 10. Each track groove 12 is formed of side surfaces 14a and 14b which are curved in FIG. 1A (cross section) and a flat bottom surface 16. Of the bottom surface 16, the central portion 17 in the groove width direction is recessed from the side. The distance between one side surface 14a and the other side surface 14b is referred to as a groove width.

研削装置２０は、ホルダ２２と、ホルダ２２の先端に取り付けられている円板状の回転砥石２４を備えている。ホルダ２２は、図示しないスライド装置によって、長手方向にスライドすることができる。スライド装置は、長手方向だけでなく、長手方向に交差する方向にもホルダ２２を移動させることができる。即ち、スライド機構は、ホルダ２２を直交する３軸方向に移動させることができる。   The grinding device 20 includes a holder 22 and a disk-shaped rotating grindstone 24 attached to the tip of the holder 22. The holder 22 can be slid in the longitudinal direction by a slide device (not shown). The slide device can move the holder 22 not only in the longitudinal direction but also in a direction crossing the longitudinal direction. That is, the slide mechanism can move the holder 22 in three orthogonal directions.

回転砥石２４は、ホルダ２２の先端に片持ち支持されている。回転砥石２４は、ベルト（不図示）によってホルダ２２の根元に配置されたモータ（不図示）に係合している。回転砥石２４は、モータによって、ホルダ２２の長手方向に交差する軸の周りに回転する。回転砥石２４は、その外周面２６と側平面２８でトラック溝１２を研削する。外周面２６は、回転砥石の軸線を含む断面において、トラック溝１２の側面１４ａ、１４ｂの望ましい湾曲形状に形成されている。回転砥石２４の側平面２８は平坦である。   The rotating grindstone 24 is cantilevered at the tip of the holder 22. The rotating grindstone 24 is engaged with a motor (not shown) disposed at the base of the holder 22 by a belt (not shown). The rotating grindstone 24 is rotated around an axis that intersects the longitudinal direction of the holder 22 by a motor. The rotary grindstone 24 grinds the track groove 12 with the outer peripheral surface 26 and the side plane 28. The outer peripheral surface 26 is formed in a desired curved shape of the side surfaces 14a and 14b of the track groove 12 in a cross section including the axis of the rotating grindstone. The side plane 28 of the rotating grindstone 24 is flat.

研削装置２０を用いた研削方法について説明する。
まず、アウタ部材１０を、研削装置２０の支持部（不図示）に固定する。このとき、アウタ部材１０の開口部１０ａが、回転砥石２４の前方（ホルダ２２の長手方向の前方）に位置する。また、回転砥石２４の回転軸がトラック溝１２の底面１６に直交するようにアウタ部材１０は配置される。
次に、モータによって回転砥石２４を回転させる。そして、スライド機構によって、回転砥石２４を回転させながら開口部１０ａから奥（図１（Ｂ）の左側）へと移動させる。このとき、回転砥石２４の側平面２８をトラック溝１２の底面１６に対向させながら、回転砥石２４を移動させる。さらに、研削装置２０は、回転砥石２４の外周面２６をトラック溝１２の一方の側面１４ａに押し当てながら回転砥石２４を移動させる。回転砥石２４がトラック溝１２の一方の側面１４ａを研削しながらトラック溝１２を奥へと移動していく。トラック溝１２の側面１４ａは、回転砥石２４によって、回転砥石２４の外周面２６の湾曲形状と同じ形状に研削されていく。なお、回転砥石２４が開口部１０ａから奥へと移動する間は、回転砥石２４の側平面２８はトラック溝１２の底面１６に接触していない。 A grinding method using the grinding apparatus 20 will be described.
First, the outer member 10 is fixed to a support portion (not shown) of the grinding device 20. At this time, the opening 10a of the outer member 10 is located in front of the rotating grindstone 24 (front in the longitudinal direction of the holder 22). Further, the outer member 10 is disposed so that the rotation axis of the rotating grindstone 24 is orthogonal to the bottom surface 16 of the track groove 12.
Next, the rotating grindstone 24 is rotated by a motor. Then, the rotating grindstone 24 is rotated by the slide mechanism from the opening 10a to the back (left side in FIG. 1B). At this time, the rotating grindstone 24 is moved while the side plane 28 of the rotating grindstone 24 is opposed to the bottom surface 16 of the track groove 12. Further, the grinding device 20 moves the rotating grindstone 24 while pressing the outer peripheral surface 26 of the rotating grindstone 24 against one side surface 14 a of the track groove 12. The rotating grindstone 24 moves the track groove 12 back while grinding one side surface 14 a of the track groove 12. The side surface 14 a of the track groove 12 is ground by the rotating grindstone 24 into the same shape as the curved shape of the outer peripheral surface 26 of the rotating grindstone 24. Note that the side plane 28 of the rotating grindstone 24 is not in contact with the bottom surface 16 of the track groove 12 while the rotating grindstone 24 moves from the opening 10 a to the back.

回転砥石２４がアウタ部材１０の奥まで移動すると、研削装置２０は、回転砥石２４を他方の側面１４ｂの方へ僅かに移動させる。即ち、回転砥石２４の外周面２６とトラック溝１２の側面１４ａを離間させる。
次に研削装置２０は、回転砥石２４の側平面２８がトラック溝１２の底面１６に当接するまで回転砥石２４を移動させる。研削装置２０は、回転砥石２４の側平面２８をトラック溝１２の底面１６に当接させながら、アウタ部材１０の奥から開口部１０ａに向けて回転砥石２４を移動させる。回転砥石２４がアウタ部材１０の奥から開口部１０ａに向けて移動する間に、回転砥石２４の側平面２８によって、トラック溝１２の底面１６が平坦に研削されていく。なお、回転砥石２４が奥から開口部１０ａへと移動する間は、回転砥石２４の外周面２６はトラック溝１２に接触していない。
以上の動作を、トラック溝１２の他方の側面１４ｂについて繰り返す。さらに他の２本のトラック溝１２についても同じ動作を繰り返す。 When the rotating grindstone 24 moves to the back of the outer member 10, the grinding device 20 slightly moves the rotating grindstone 24 toward the other side surface 14b. That is, the outer peripheral surface 26 of the rotating grindstone 24 and the side surface 14a of the track groove 12 are separated.
Next, the grinding device 20 moves the rotating grindstone 24 until the side plane 28 of the rotating grindstone 24 contacts the bottom surface 16 of the track groove 12. The grinding device 20 moves the rotating grindstone 24 from the back of the outer member 10 toward the opening 10 a while bringing the side plane 28 of the rotating grindstone 24 into contact with the bottom surface 16 of the track groove 12. While the rotating grindstone 24 moves from the back of the outer member 10 toward the opening 10a, the bottom surface 16 of the track groove 12 is ground flat by the side plane 28 of the rotating grindstone 24. Note that the outer peripheral surface 26 of the rotating grindstone 24 is not in contact with the track groove 12 while the rotating grindstone 24 moves from the back to the opening 10a.
The above operation is repeated for the other side surface 14 b of the track groove 12. Further, the same operation is repeated for the other two track grooves 12.

上記の研削方法の利点を図２と図３を用いて説明する。図２は、トリポード型等速自在継手１００の長手方向に交差する断面図、即ち横断面を示す。図３は、トラック溝１２とローラ５２の嵌合部分の拡大図を示す。
前述したように、回転砥石２４の回転軸線を含む断面において外周面２６が湾曲している回転砥石２４の外周面２６でトラック溝１２の側面１４を研削する。回転砥石２４の外周面２６の断面は、ローラ５２の断面と同じ形状に湾曲している。これにより、トラック溝１２の側面１４を、横断面から見てローラ５２の外周面と同じ湾曲面に研削することが可能となる。
円板状の回転砥石２４の平坦な側平面２８によってトラック溝１２の底面１６を研削する。これにより、トラック溝１２の底面１６を平坦に研削することができる。湾曲した側面１４と平坦な底面１６を夫々研削することによって、図３に示す距離Ｌ（トラック溝１２の溝幅が最大となる位置Ｐとトラック溝１２の底面１６との間の距離）の公差を小さくすることができる。
回転砥石２４をアウタ部材１０の開口部から奥へ移動させながら回転砥石２４の外周面２６でトラック溝１２の側面１４を研削し、回転砥石２４を奥から開口部１０ａへ移動させながら回転砥石２４の側平面２８でトラック溝１２の底面１６を研削する。トラック溝１２の側面１４と底面１６を別々に研削するので、両者とも高精度に仕上げることができる。さらに、回転砥石２４の１往復でトラック溝１２の側面１４と底面１６を研削することができるので、研削時間を短縮することができる。 The advantages of the above grinding method will be described with reference to FIGS. FIG. 2 is a cross-sectional view that intersects the longitudinal direction of the tripod type constant velocity universal joint 100, that is, a cross-section. FIG. 3 shows an enlarged view of a fitting portion between the track groove 12 and the roller 52.
As described above, the side surface 14 of the track groove 12 is ground by the outer peripheral surface 26 of the rotating grindstone 24 whose outer peripheral surface 26 is curved in the cross section including the rotation axis of the rotating grindstone 24. The cross section of the outer peripheral surface 26 of the rotating grindstone 24 is curved in the same shape as the cross section of the roller 52. As a result, the side surface 14 of the track groove 12 can be ground to the same curved surface as the outer peripheral surface of the roller 52 as viewed from the cross section.
The bottom surface 16 of the track groove 12 is ground by the flat side plane 28 of the disk-shaped rotating grindstone 24. Thereby, the bottom surface 16 of the track groove 12 can be ground flat. By grinding the curved side surface 14 and the flat bottom surface 16 respectively, the tolerance of the distance L shown in FIG. 3 (the distance between the position P at which the groove width of the track groove 12 is maximum and the bottom surface 16 of the track groove 12) is shown. Can be reduced.
The side surface 14 of the track groove 12 is ground by the outer peripheral surface 26 of the rotating grindstone 24 while moving the rotating grindstone 24 from the opening of the outer member 10, and the rotating grindstone 24 is moved while moving the rotating grindstone 24 from the back to the opening 10 a. The bottom surface 16 of the track groove 12 is ground by the side plane 28. Since the side surface 14 and the bottom surface 16 of the track groove 12 are ground separately, both can be finished with high accuracy. Furthermore, since the side surface 14 and the bottom surface 16 of the track groove 12 can be ground by one reciprocation of the rotating grindstone 24, the grinding time can be shortened.

以上、本発明の具体例を詳細に説明したが、これらは例示に過ぎず、特許請求の範囲を限定するものではない。特許請求の範囲に記載の技術には、以上に例示した具体例を様々に変形、変更したものが含まれる。
本明細書または図面に説明した技術要素は、単独であるいは各種の組合せによって技術的有用性を発揮するものであり、出願時請求項記載の組合せに限定されるものではない。また、本明細書または図面に例示した技術は複数目的を同時に達成し得るものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。 Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

トラック溝の研削方法を説明する図である。It is a figure explaining the grinding method of a track groove. トリポード型等速自在継手の横断面図である。It is a cross-sectional view of a tripod type constant velocity universal joint. トラック溝とローラの嵌合部分の拡大図である。It is an enlarged view of the fitting part of a track groove and a roller.

符号の説明Explanation of symbols

１０：アウタ部材
１２：トラック溝
１４ａ、１４ｂ：トラック溝の側面
１６：トラック溝の底面
２０：研削装置
２２：ホルダ
２４：回転砥石
２６：回転砥石の外周面
２８：回転砥石の側平面
１００：トリポード型等速自在継手 10: Outer member 12: Track groove 14a, 14b: Side surface of track groove 16: Bottom surface of track groove 20: Grinding device 22: Holder 24: Rotary grindstone 26: Outer peripheral surface of rotary grindstone 28: Side plane of rotary grindstone 100: Tripod Type constant velocity universal joint

Claims (1)

トリポード型等速自在継手のアウタ部材のトラック溝であり長手方向に交差する断面において側面が湾曲しているトラック溝の研削方法であり、
円板状の回転砥石を、回転砥石の側平面をトラック溝の底面に対向させて配置し、回転砥石をアウタ部材の開口部から奥へ移動させながら回転砥石の側平面でトラック溝の底面を研削し、回転砥石をアウタ部材の奥から開口部へ移動させながら回転砥石の外周面でトラック溝の側面を研削することを特徴とするトリポード型等速自在継手のトラック溝の研削方法。 A track groove of an outer member of a tripod type constant velocity universal joint, and a grinding method of a track groove whose side surface is curved in a cross section intersecting with a longitudinal direction,
A disc-shaped rotating grindstone is placed with the side surface of the rotating grindstone facing the bottom surface of the track groove, and while moving the rotating grindstone from the opening of the outer member to the back, the bottom surface of the track groove is aligned with the side surface of the rotating grindstone. A method for grinding a track groove of a tripod type constant velocity universal joint, characterized in that the side surface of the track groove is ground on the outer peripheral surface of the rotating grindstone while grinding and moving the rotating grindstone from the back of the outer member to the opening .
JP2008132146A 2008-05-20 2008-05-20 Grinding method of track groove of tripod type constant velocity universal joint Expired - Fee Related JP5169476B2 (en)

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JPH01126421A (en) * 1987-11-10 1989-05-18 Tsubakimoto Seiko:Kk Bearing for linear motion and method for processing bearing body thereof
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