JPH0710561U - Wide angle universal joint boot - Google Patents
Wide angle universal joint bootInfo
- Publication number
- JPH0710561U JPH0710561U JP4392093U JP4392093U JPH0710561U JP H0710561 U JPH0710561 U JP H0710561U JP 4392093 U JP4392093 U JP 4392093U JP 4392093 U JP4392093 U JP 4392093U JP H0710561 U JPH0710561 U JP H0710561U
- Authority
- JP
- Japan
- Prior art keywords
- boot
- bellows
- universal joint
- valley
- mountain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Sealing Devices (AREA)
Abstract
(57)【要約】
【目的】 屈折角４０度以上の拡角度下においても蛇腹
部は常に正しい折畳み状態となって山部、谷部等の接触
箇所は常に面接触となってブーツの耐久性の向上を図
る。
【構成】 （１）各山部１８とこれに接続する各谷部１
９との間の距離はほぼ同一であり、（２）各谷部１９と
該谷部１９から小径部１７側に接続する各山部１８との
半径方向の段差の比は（Ｄ2 −Ｄ1 ）／Ｄ2 ×１００＝
２６〜３６％であり、（３）各山部１８の肉厚は、該山
部に接続する各谷部１９の肉厚との比ｔ1／ｔ2 ×１０
０＝６０〜１００％の範囲内にある広角度自在継手用ブ
ーツ。
(57) [Abstract] [Purpose] Even under an expansion angle of 40 degrees or more, the bellows are always in the correct folded state, and contact points such as peaks and valleys are always in surface contact, and the durability of the boot To improve. [Structure] (1) Each crest 18 and each trough 1 connected thereto
The distances between the valleys 19 are substantially the same, and (2) the ratio of the step in the radial direction between the valleys 19 and the peaks 18 connected from the valleys 19 to the small diameter portion 17 side is (D 2 −D 1 ) / D 2 × 100 =
26-36%, and (3) the wall thickness of each crest 18 is the ratio t 1 / t 2 × 10 to the wall thickness of each trough 19 connected to the crest.
Boots for wide-angle universal joints in the range of 0 = 60 to 100%.
Description
【０００１】[0001]
本考案は、自在継手を覆って使用される蛇腹状ブーツに関し、更に詳しくはジ ョイント角度が３０°以上の広角度において用いられる主として自動車の自在継 手用ブーツに関する。 The present invention relates to a bellows-shaped boot used for covering a universal joint, and more particularly to a boot for a universal joint of an automobile mainly used in a wide angle of 30 ° or more.
【０００２】[0002]
自動車の車輪軸は、主として自在継手を介して駆動軸より回転駆動される。し たがって、上記自在継手を使用した自動車においては、該自在継手を収設した継 手ケースに砂塵等の異物が侵入しないよう継手ケースと前記駆動軸の連結側端部 との間をゴム製などの弾性材料で成形したいわゆる蛇腹状のブーツで覆うと共に 、該ブーツの内部にグリースを封入して自在継手の潤滑を図っている。 The wheel shaft of an automobile is rotationally driven mainly by a drive shaft via a universal joint. Therefore, in an automobile using the universal joint, a rubber member is used between the joint case and the connecting side end of the drive shaft to prevent foreign matter such as sand dust from entering the joint case housing the universal joint. It is covered with a so-called bellows-shaped boot made of an elastic material such as, and grease is sealed inside the boot to lubricate the universal joint.
【０００３】 一般的にこの種従来の自在継手用ブーツについて、その１例として、６個の山 部と、谷部で形成されている場合を説明すると、図８，９に示す如く車輪軸１側 の継手ケース２の外周に嵌着される大径部３と駆動軸４の外周に嵌着される小径 部５との間には山部２１として６個の山部２１ａ，２１ｂ，２１ｃ，２１ｄ，２ １ｅ，および２１ｆを有する一定肉厚の蛇腹部６を一体に形成したものであって 、前記大径部３および小径部５が止めバンド等の締結部材７，７′で締付け固定 されている。Generally, as an example of a conventional universal joint boot of this kind, a case where it is formed of six peaks and valleys will be described. As shown in FIGS. Between the large diameter portion 3 fitted on the outer circumference of the joint case 2 on the side and the small diameter portion 5 fitted on the outer circumference of the drive shaft 4, there are six peak portions 21a, 21b, 21c, A bellows portion 6 having a constant thickness and having 21d, 21e, and 21f is integrally formed, and the large diameter portion 3 and the small diameter portion 5 are fastened and fixed by fastening members 7, 7'such as a stop band. ing.
【０００４】 ところが、かかる従来のブーツにおいては、車輪軸１と駆動軸４との間のジョ イント角度θが３０°以上に屈折したときには前記大径部３に接続する蛇腹部６ の第１山部２１ａが大径部３の内端部外面８に点または線接触して該部分の面圧 が大きくなり、また各山部例えば２１ａとこれに接続する谷部２２ｂとの間の距 離Ｐ2 1 a と、谷部２２ｂとこれに接続する山部２１ｂとの間の距離Ｐ2 2 b と は同一ではなく相異している。この関係は、各山部とこれに接続する各谷部間の 距離においても同じである。更に各山部２１と各谷部２２との肉厚比も等しいた めに、高速回転に伴う山部２１と谷部２２の半径差による周速度の相異および高 速回転に伴うブーツ空間内に封入したグリースの遠心力作用等によりブーツはこ れら外部応力に対する抵抗バランスが不均衡となって蛇腹部６の正確な折畳み状 態となるのが困難となり、その結果、各山部相互間、およびこれらの間に連続す る各傾斜面２３と山部２１とが点または線接触して両者間での摩擦により亀裂が 生じる可能性もあって、ブーツの寿命が短くなるという欠点がっあった。しかも 最近ではこのジョイント角度が更に広角度化傾向にあるので、上記悪影響は更に 助長される。However, in such a conventional boot, when the joint angle θ between the wheel shaft 1 and the drive shaft 4 is bent to 30 ° or more, the first peak of the bellows part 6 connected to the large diameter part 3 is formed. The portion 21a comes into point or line contact with the outer surface 8 of the inner end portion of the large-diameter portion 3 to increase the surface pressure of the portion, and the distance P between each peak portion, for example, 21a and the valley portion 22b connected thereto. The distance P 2 2 b between 2 1 a and the valley portion 22 b and the mountain portion 21 b connected thereto is not the same but different. This relationship is the same in the distance between each peak and each valley connected to it. Further, since the wall thickness ratios of the peaks 21 and the valleys 22 are equal, the difference in peripheral speed due to the difference in radius between the peaks 21 and the valleys 22 due to the high speed rotation and the inside of the boot space due to the high speed rotation. Due to the centrifugal force of the grease enclosed in the boot, the resistance balance of the boot against these external stresses becomes imbalanced, making it difficult for the bellows part 6 to fold correctly, and as a result, between the peak parts , And the slopes 23 and the peaks 21 that are continuous between them may come into point or line contact with each other to cause cracks due to friction between the two, which has the drawback of shortening the life of the boot. there were. Moreover, recently, the joint angle tends to be wider, so that the above adverse effect is further promoted.
【０００５】[0005]
本考案者等は、上述の如き実情に鑑み、上記ブーツの成形性との関連性におい てその形状、構造について根本的に鋭意検討を行った結果、従来のダイレクトブ ロー成形の場合には寸法精度を出すことは非常に困難であり、特にフレキシブル ブーツのような場合、両端の取付部の寸法精度が出せないので密封性が問題とな り、しかも蛇腹部の肉厚寸法にもバラツキが生じるため耐久性上問題となってい る。またインジエクションブロー成形の場合では、両端の取付部の寸法はパリソ ン成形時の射出成形において寸法精度が得られるため、ダイレクトブロー成形の ような問題は起こらず、また製品取出しも容易であるが蛇腹部の精度、特に肉厚 寸法精度、即ち、各山部と各谷部の肉厚のバラツキが大くなるという欠点があっ た。 In consideration of the above-mentioned circumstances, the inventors of the present invention have conducted radically diligent studies on the shape and structure of the boot in relation to the formability of the boot. It is very difficult to obtain accuracy, and especially in the case of flexible boots, the dimensional accuracy of the mounting parts at both ends cannot be obtained, so the sealing performance becomes a problem, and the wall thickness of the bellows part also varies. Therefore, it is a problem in terms of durability. In addition, in the case of injection blow molding, the dimensions of the mounting parts at both ends can be obtained with high dimensional accuracy in injection molding during parison molding, so problems such as direct blow molding do not occur, and product removal is easy. However, there was a drawback that the accuracy of the bellows part, in particular, the thickness dimensional accuracy, that is, the variation in the wall thickness of each peak and each valley became large.
【０００６】 一方、ブーツの形状、構造面での検討では、蛇腹部の山部と谷部との各ピッチ 差が大きいと後述の如くブーツの屈曲に伴う折畳み剛性が大となってブーツの組 付性が困難となり、しかも重量軽減化に伴うブーツの肉厚の薄肉化には限界があ ってせいぜい0.8 〜2.6mm が限度である。以上諸点の検討の結果、本考案者等は 従来の蛇腹部の山部と谷部における点または線接触からこれらを相互に面接触さ せることにより、面圧を下げて蛇腹部の耐久性向上をはかること、そのためには 蛇腹部が折畳み易い形状構造とすること、しかもこの観点は蛇腹部の肉厚の薄肉 化の傾向に一致する点等の知見を得、本考案を完成するに至った。On the other hand, in consideration of the shape and structure of the boot, if the pitch difference between the peak portion and the valley portion of the bellows portion is large, the folding rigidity accompanying the bending of the boot becomes large as described later, and the boot assembly It is difficult to attach, and there is a limit to the thickness reduction of the boot due to the weight reduction, and the limit is 0.8 to 2.6 mm at most. As a result of the examination of the above points, the present inventors reduced the surface pressure to improve the durability of the bellows part by making the points or line contacts of the peaks and valleys of the conventional bellows contact each other. In order to achieve this, we have obtained the knowledge that the bellows part has a shape structure that is easy to fold, and that this viewpoint corresponds to the tendency of the wall thickness of the bellows part to become thinner. .
【０００７】 かくして、本考案は上記知見に基づき、例えば３０°〜５０°のジョイントの 広角度下における屈折に際しても蛇腹部は常に正しい折畳み状態を呈し、したが って山部と山部に接続して谷部へ接続する傾斜面どうしの接触は面接触すること によって耐久性向上を図った自在継手用ブーツを提供することをその目的とする 。[0007] Thus, the present invention is based on the above findings, and the bellows portion always exhibits the correct folded state even when the joint is bent at a wide angle of 30 ° to 50 °, for example, and is therefore connected to the mountain portion and the mountain portion. The purpose of the present invention is to provide a boot for a universal joint with improved durability by contacting the inclined surfaces connecting to the troughs with each other.
【０００８】[0008]
前記課題を解決するための本考案の構成について、実施例に対応する図１，２ および図３に基づいて詳細に説明する。 図において、ブーツ１５は、その一端に継手ケース１１の外周に嵌着固定され る大径部１６を有し、且つ他方端において前記継手ケース１１内に収設された自 在継手１４を介して接続した駆動軸１３に嵌着固定される小径部１７を有してい ると共に、前記大径部１６から小径部１７に亘り複数個の山部１８の直径が順次 小さくなるよう形成された蛇腹部２０を具備している。そして該蛇腹部２０はそ の両端部に形成されている周溝２７，２７′を有する固定部２４，２４′により 継手ケース１１と駆動軸１３に締付部材２８，２８′により締付固定されている 。 The configuration of the present invention for solving the above problems will be described in detail with reference to FIGS. 1, 2 and 3 corresponding to the embodiment. In the figure, a boot 15 has a large-diameter portion 16 fitted and fixed to the outer circumference of the joint case 11 at one end thereof, and a self-contained joint 14 housed in the joint case 11 at the other end thereof. The bellows portion has a small diameter portion 17 which is fitted and fixed to the connected drive shaft 13, and is formed such that the diameters of the plurality of peak portions 18 are gradually reduced from the large diameter portion 16 to the small diameter portion 17. Equipped with 20. The bellows portion 20 is fixedly fastened to the joint case 11 and the drive shaft 13 by the fastening members 28, 28 'by the fastening portions 24, 24' having the circumferential grooves 27, 27 'formed at both ends thereof. ing .
【０００９】 上記構成からなるブーツ１５では、各山部１８とこれに接続する各谷部１９と の間の距離はすべてほぼ同一である。即ち、各山部１８とこれに接続する各谷部 との間の距離のどこをとってもみてもその各距離は同一である。これを図１につ いて説明すると、例えば第１山部１８ａとこれに接続する第２谷部１９ｂとの間 の距離Ｐ1 は、第２谷部１９ｂとこれに接続する第２山部１８ｂとの間の距離Ｐ 2 とはほぼ同一である。そして、この関係は他の各山部，谷部の間においても同 様である。In the boot 15 configured as described above, the distances between the peaks 18 and the valleys 19 connected to the peaks 18 are substantially the same. That is, the distances between the peaks 18 and the valleys connected to the peaks 18 are the same no matter what. This will be described with reference to FIG. 1. For example, the distance P between the first mountain portion 18a and the second valley portion 19b connected to the first mountain portion 18a.1Is the distance P between the second valley portion 19b and the second mountain portion 18b connected thereto. 2 Is almost the same as. And this relationship is the same between the other mountains and valleys.
【００１０】 次に、本考案における蛇腹部２０の山の数は複数個が必要であって、その数は 特に限定はないが５〜７個が最も好適である。Next, the number of peaks of the bellows portion 20 in the present invention is required to be plural, and the number thereof is not particularly limited, but 5 to 7 is most preferable.
【００１１】 また各谷部１９の半径方向の長さとこれらの小径部１７側に延在する山部１８ の半径方向の段差の比は２６〜３６％である。即ち第１谷部１９ａの半径方向の 長さＤ1 に対し第１山部１８ａの半径方向の長さＤ2 との段差の比（Ｄ2 −Ｄ1 ）／Ｄ2 ×１００が２６〜３６％の範囲内に設定されることとなる。更に本考案 の蛇腹部２０では、各山部の肉厚ｔ1 は、これに接続する各谷部の肉厚ｔ2 に対 し６０〜９０％であることが必要である。即ち図２に示す谷部の肉厚ｔ2 と山部 の肉厚ｔ1 との比ｔ1 ／ｔ2 ×１００が６０〜１００％である。この山部と谷部 に各肉厚差を付与することにより駆動軸１３と継手ケース１１との間のジョイン ト角度θが３０°以上、特に３０°〜５０°の広角度屈折時には蛇腹部２０は正 常に折畳み状態を呈して第１山部１８ａから大径部１６側に接続する傾斜面３３ ａと大径部１６から小径部１７側に接続する内端部外面３４とは面接触可能とな る。更に、第１山部１８ａから小径部１７側に接続する傾斜面３３ｂとこれに接 続する傾斜面３３ｃとは同様に面接触可能とし、以下他の接続する傾斜面におい ても同様に相互に面接触可能ならしめた構成が採り入れらている。その結果、蛇 腹部２０の強度、摩耗性と屈曲疲労性等に関する耐久性が改良される。Further, the ratio of the radial length of each valley portion 19 to the step difference in the radial direction of the peak portion 18 extending toward the small diameter portion 17 is 26 to 36%. That step ratio between radial length D 2 of the first valley 19a of the radial length D 1 to the first crest 18a (D 2 -D 1) / D 2 × 100 is 26 to 36 It will be set within the range of%. Further, in the bellows portion 20 of the present invention, the wall thickness t 1 of each crest portion needs to be 60 to 90% of the wall thickness t 2 of each valley portion connected thereto. That is, the ratio t 1 / t 2 × 100 of the wall thickness t 2 of the valley portion and the wall thickness t 1 of the mountain portion shown in FIG. 2 is 60 to 100%. By providing a difference in wall thickness between the peak portion and the valley portion, the bellows portion 20 is provided when the joint angle θ between the drive shaft 13 and the joint case 11 is 30 ° or more, and particularly when wide angle bending is 30 ° to 50 °. Is in a normally folded state, and the inclined surface 33a connecting from the first mountain portion 18a to the large diameter portion 16 side and the inner end outer surface 34 connecting from the large diameter portion 16 side to the small diameter portion 17 surface contact can be made. Become. Further, the inclined surface 33b connecting from the first mountain portion 18a to the small diameter portion 17 side and the inclined surface 33c connected to the same can be brought into surface contact with each other, and the other connected inclined surfaces will also be mutually similar. It adopts a structure that allows surface contact. As a result, the strength of the bellows portion 20 and the durability of the bellows portion 20 with respect to wear and bending fatigue are improved.
【００１２】 更に、蛇腹部２０を構成する各山部１８の内面側の曲率半径Ｒと各谷部１９の 外面側の曲率半径Ｒ′がほぼ等しければなお一層好適である。Furthermore, it is even more preferable if the radius of curvature R on the inner surface side of each peak portion 18 forming the bellows portion 20 and the radius of curvature R ′ on the outer surface side of each valley portion 19 are substantially equal.
【００１３】 本考案におけるブーツ１５を構成する合成樹脂としては、射出成形性にすぐれ た弾性体としてポリエステル系エラストマーが最適であり、成形法も射出成形法 が採用される。As the synthetic resin forming the boot 15 in the present invention, a polyester elastomer is most suitable as an elastic body having excellent injection moldability, and the injection molding method is also adopted.
【００１４】[0014]
上記のとおり、本考案の構成に係るブーツは、接続する各山部と各谷部のピッ チはほぼ同一であるので各山部と各谷部の膜剛性が小となって荷重に対して蛇腹 部は容易に折畳まれ、また各谷部と小径側に接続する各山部との半径方向の段差 の比が２６〜３６％の範囲にあるので蛇腹部の折畳みに対するバックリング作用 がなく、しかも脱型し易い形状となる。 As described above, in the boot according to the present invention, since the pitches of the connected peaks and valleys are almost the same, the film rigidity of the peaks and valleys becomes small, so that the load is not affected. The bellows are easily folded, and the ratio of the step in the radial direction between each valley and each peak connected to the small diameter side is in the range of 26 to 36%, so there is no buckling effect on the folding of the bellows. In addition, the shape is easy to remove from the mold.
【００１５】 更に、各山部の肉厚は接続する各谷部の肉厚の６０〜１００％の範囲内にある ので蛇腹部の強度，耐摩耗性，屈曲疲労性および高剛性時の折畳み性が両立作用 する。そして更に、蛇腹部の各山部内面側と各谷部外面側のそれぞれの曲率半径 がほぼ等しい条件であるので折畳み時には均等な折畳み荷重によりスムーズに折 畳まれることとなって、３０°〜５０°の広角度のジョイント角度においても正 しい折畳み状態となって、各山部・谷部は相互に面接触するので接触部の面圧が 減少して応力集中は回避され、したがって、この部分からの亀裂発生は防止され る。Furthermore, since the thickness of each crest is within the range of 60 to 100% of the thickness of each trough to be connected, the strength of the bellows, wear resistance, bending fatigue, and foldability at the time of high rigidity are obtained. Work together. Furthermore, since the radii of curvature on the inside surface of each crest of the bellows and the outside radius of each valley are almost equal, when folded, the folds will be smoothly folded due to an even fold load, and the folds will increase from 30 ° to 30 °. Even at a wide joint angle of 50 °, the folded state is correct, and the peaks and valleys are in surface contact with each other, so the surface pressure at the contact part is reduced and stress concentration is avoided. Generation of cracks from is prevented.
【００１６】[0016]
以下、本考案の実施例を添付図面に基づいて詳細に説明するが、この本考案は これらによって限定されるものではない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited thereto.
【００１７】 図１は本考案に係るブーツの一例を示す側面断面図、図２は図１におけるＡ部 拡大図および図３は同ブーツを使用した自在継手に大きなジョイント角度を付与 した状態を示す側面断面図である。FIG. 1 is a side sectional view showing an example of a boot according to the present invention, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 shows a universal joint using the boot with a large joint angle. It is a side sectional view.
【００１８】 本例においては、ブーツの山部の数は６個を選定して例示して説明する。これ らの図において、１１は車輪軸１２の端部に固着された継手ケースであって、１ ３は該継手ケース１１内に収設され、自在継手１４を介して前記車輪軸１２に対 し等速回転可能に連結された駆動軸であり、１５は前記継手ケース１１と駆動軸 １３との間に亘って設けられた合成樹脂製のブーツ１５である。そして該ブーツ １５はその一端において、前記継手ケース１１の外周に嵌挿される円筒状の大径 部１６を有し、且つ他方端側において前記駆動軸１３の外周に嵌挿される円筒状 の小径部１７を有しいてると共に、前記大径部１６と小径部１７との間には、前 記大径部１６から小径部１７に近付くに従って順次直径が小さくなる６つの山部 １８ａ，１８ｂ，１８ｃ，１８ｄ，１８ｅ、および１８ｆとこれに対応する６つ の谷部１９ａ，１９ｂ，１９ｃ，１９ｄ，１９ｅおよび１９ｆとを備えた蛇腹部 ２０が形成されている。In this example, the number of peaks of the boot is selected to be 6 and will be described as an example. In these figures, 11 is a joint case fixed to the end of the wheel shaft 12, 13 is housed in the joint case 11, and is connected to the wheel shaft 12 via a universal joint 14. Reference numeral 15 is a drive shaft connected so as to be rotatable at a constant speed, and reference numeral 15 is a boot 15 made of a synthetic resin provided between the joint case 11 and the drive shaft 13. The boot 15 has a cylindrical large-diameter portion 16 inserted into the outer periphery of the joint case 11 at one end, and a cylindrical small-diameter portion inserted into the outer periphery of the drive shaft 13 on the other end side. Between the large-diameter portion 16 and the small-diameter portion 17, there are six peaks 18a, 18b, 18c between which the diameter gradually decreases as the large-diameter portion 16 approaches the small-diameter portion 17. A bellows portion 20 having 18d, 18e, and 18f and six valley portions 19a, 19b, 19c, 19d, 19e, and 19f corresponding thereto is formed.
【００１９】 前記大径部１６および小径部１７は継手ケース１１および駆動軸１３にそれぞ れ固定する固定部２４，２４′を有し、その内周面に形成された断面三角形状の リブ状突起２５，２５′を前記継手ケース１１および駆動軸１３の外周面に周設 した凹溝２６，２６′にそれぞれ嵌入し，且つ外周面に形成した周溝２７，２７ ′に嵌着した締付部材２８，２８′で固定部２４，２４′を締付けることにより 蛇腹部２０内の空間に封入したグリースが漏出しないよう液密的に固着されてい る。The large-diameter portion 16 and the small-diameter portion 17 have fixing portions 24 and 24 ′ that are fixed to the joint case 11 and the drive shaft 13, respectively, and are rib-shaped with a triangular cross section formed on the inner peripheral surfaces thereof. Tightening by fitting the projections 25, 25 'into the concave grooves 26, 26' provided on the outer peripheral surfaces of the joint case 11 and the drive shaft 13, respectively, and by fitting them in the peripheral grooves 27, 27 'formed on the outer peripheral surfaces. By tightening the fixing portions 24 and 24 'with the members 28 and 28', the grease enclosed in the space in the bellows portion 20 is liquid-tightly fixed so as not to leak out.
【００２０】 ところで、本考案の構成になるブーツ１５の蛇腹部２０は、各山部１８とこれ に接続する各谷部１９との距離は同一であることが必要である。即ち、図４に示 す如く硬度，肉厚共に同一の場合における距離同一（ＬA ≒ＬA ′) の場合のＡ 形状（イ）と、距離のみが同一でない（ＬB ≠ＬB ′）場合のＢ形状（ロ）の両 方について、それぞれ軸方向（矢印方向）に荷重を加えた場合の荷重・たわみ量 を測定し、その結果をグラフ（ハ）に示した。即ち、Ａ形状（イ）の方が小荷重 に対してもたわみ量（δ）が大であるに対し、Ｂ形状（ロ）の方は同じ荷重に対 してδは小となる。その結果Ａ形状の場合では蛇腹部の膜剛性が小となるので荷 重に対して蛇腹部がスムーズに折畳まれることとなる。By the way, in the bellows portion 20 of the boot 15 having the configuration of the present invention, it is necessary that the distance between each crest portion 18 and each trough portion 19 connected thereto is the same. That is, as shown in FIG. 4, when the hardness and the wall thickness are the same, the distance is not the same (L A ≈L A ′) and the shape A is the same (L B ≠ L B ′). In both cases of B shape (b) in the case, the load and the amount of deflection when a load was applied in the axial direction (arrow direction) were measured, and the results are shown in graph (c). That is, the A shape (a) has a larger amount of deflection (δ) even under a small load, whereas the B shape (b) has a smaller δ for the same load. As a result, in the case of the A shape, the membrane rigidity of the bellows portion becomes small, so that the bellows portion can be smoothly folded with respect to the load.
【００２１】 次に、本考案に係るブーツ１５の蛇腹部２０は、各谷部１９の半径方向の長さ Ｄ1 とこれの小径側１７に接続する各山部１８の半径方向の長さＤ2 との段差の 比、即ち（Ｄ2 −Ｄ1 ）／Ｄ2 ×１００は２６〜３６％に設定される。この理由 は、ブーツ１５の折畳み易さと射出成形時の脱型の仕易さを考慮したためである 。Next, the bellows portion 20 of the boot 15 according to the present invention has a radial length D 1 of each valley portion 19 and a radial length D of each mountain portion 18 connected to the small diameter side 17 thereof. The ratio of the level difference with 2 , that is, (D 2 −D 1 ) / D 2 × 100 is set to 26 to 36%. The reason for this is that the easiness of folding the boot 15 and the ease of removing the mold at the time of injection molding are taken into consideration.
【００２２】 図５は、蛇腹部２０を構成する膜長（ｍｍ）と山・谷部の半径方向の段差の比 率（％）との関係を示したグラフである。これより分かるとおり上記比率が２６ ％未満ではジョイント角度θが３０°以上の広角度域になった場合には蛇腹部の バックリング作用が働いて折畳みが困難となり、一方３６％を越えると脱型時に おける谷部１９が金型コアーを越えるに際し弾性率が低下して塑性変形となるの で脱型が困難となる。したがって本考案では斜線部分の２６〜３６％の範囲が設 定される。FIG. 5 is a graph showing the relationship between the film length (mm) forming the bellows portion 20 and the ratio (%) of the step difference in the radial direction between the peaks and troughs. As can be seen from the above, when the above ratio is less than 26%, the buckling action of the bellows part makes it difficult to fold when the joint angle θ is in the wide angle range of 30 ° or more. When the valleys 19 in some cases pass over the mold core, the elastic modulus decreases and plastic deformation occurs, so that demolding becomes difficult. Therefore, in the present invention, the range of 26 to 36% of the shaded area is set.
【００２３】 更に、各山部の肉厚ｔ1 は接続する各谷部の肉厚ｔ2 に対しｔ1 ／ｔ2 ×１０ ０が６０〜１００％であることが必要である。図６（イ）は蛇腹部の山部の肉厚 ｔ1 と谷部の肉厚ｔ2 との対比において、その適正範囲を決定すべくこれに用い た試験用のモデル形状であり、また（ロ）はこのモデル形状の山部の両端部を試 験機にセットして矢印方向に荷重を加え、この場合の谷部の歪の状況について有 限要素法を活用して２次元解析を行って歪（ε）を計算し、更にこれと摩耗性、 成形性、耐久試験結果との相関性についてその結果をグラフ化したものである。 それによると、山部と谷部の肉厚比においてｔ1 ／ｔ2 の比が0.6 未満では蛇腹 部２０の耐摩耗性および射出成形における脱型性に限界があり、また1.0 を越え ると谷部の強度低下が現れて摩耗性、屈曲疲労性に関する耐久試験上不適である ことが分かった。そこで適正範囲は６０〜１００％が決定された。Further, the wall thickness t 1 of each crest portion needs to be 60 to 100% of t 1 / t 2 × 100 with respect to the wall thickness t 2 of each valley portion to be connected. FIG. 6 (a) shows the model shape for the test used for determining the appropriate range of the comparison between the wall thickness t 1 of the ridge of the bellows and the wall thickness t 2 of the valley, and ( B) sets both ends of the peak of this model shape on the tester and applies a load in the direction of the arrow. In this case, the two-dimensional analysis is performed using the finite element method for the situation of the strain in the valley. The strain (ε) was calculated by using the graph, and the results were plotted in a graph showing the correlation between the strain (ε) and the wearability, moldability, and durability test results. According to the report, there is a limit to the demolding properties in wear resistance and injection molding of t 1 / t 2 ratio is the bellows portion 20 is less than 0.6 in the peaks and the thickness ratio of the valley, also when Ru exceeds 1.0 It was found that the strength of the valleys decreased and it was unsuitable for the endurance test concerning wear and bending fatigue. Therefore, the appropriate range was determined to be 60 to 100%.
【００２４】 そして更に、本考案の蛇腹部２０を構成する各山部１８の内面側の曲率半径Ｒ と各谷部１９の外面側の曲率半径Ｒ′とがほぼ等しければ好適である。即ち、山 部と谷部の間においてＲが相異するとこの部分の剛性が不均衡となって折畳み時 には特に山部の折畳みが困難となる。また、折畳み時には均等な折畳み荷重が得 られず、スムーズな折畳み状態とすることは困難である。なお、山部と谷部のＲ が等しい場合であって、そのＲが大に過ぎると剛性が大となって折畳み荷重が大 きくなる。反対に、そのＲが小に過ぎると折畳み荷重は小となるが成形時の脱型 がやや困難となるのでＲの選定は重要である。Further, it is preferable that the radius of curvature R on the inner surface side of each crest 18 and the radius of curvature R'on the outer surface side of each trough 19 which constitute the bellows portion 20 of the present invention are substantially equal. That is, if the R is different between the mountain portion and the valley portion, the rigidity of this portion becomes unbalanced, and it becomes particularly difficult to fold the mountain portion when folding. In addition, it is difficult to obtain a smooth folding state because a uniform folding load cannot be obtained during folding. It should be noted that when the R 2 of the mountain portion is equal to that of the valley portion, and if the R 2 is too large, the rigidity becomes large and the folding load becomes large. On the other hand, if R is too small, the folding load will be small, but demolding at the time of molding will be somewhat difficult, so the selection of R is important.
【００２５】 次に、同様に本考案の構成になるブーツ１５（図１参照）と従来のブーツ９（ 図８参照）を比較例としてそれぞれ射出成形し（使用合成樹脂；ポリエステル系 エラストマー）、これについて車輪軸１のジョイント角度θとの関係において耐 久試験を行った結果のグラフを図７に示す。本試験は雰囲気８０℃、４００r.p. m で行った。本グラフから分かるように、本考案のブーツＣでは、耐久性の点で すぐれており、従来品Ｄに比較して広角度において寿命が長いことを示している 。Next, similarly, the boot 15 (see FIG. 1) and the conventional boot 9 (see FIG. 8) each having the configuration of the present invention are respectively injection-molded (synthetic resin used: polyester-based elastomer) as comparative examples. Fig. 7 shows a graph of the result of the endurance test performed on the wheel shaft 1 in relation to the joint angle θ. This test was carried out in an atmosphere of 80 ° C. and 400 rpm. As can be seen from this graph, the boot C of the present invention is superior in durability and shows that the boot C has a long life at a wide angle as compared with the conventional product D.
【００２６】 本考案の自在継手ブーツは、叙上の構成を有するものであるが、この取付け方 法としてはブーツ１５を自在継手１４に被着する場合は、小径部１７を駆動軸１ ３に、大径部１６を継手ケース１１にそれぞれ嵌着し、蛇腹部２０に外力が加わ らないよう大径部１６の固定部２４および小径部１７の固定部２４′を締付け部 材２７，２７′で固定し、これと同時にブーツ１５内の空間にグリース等の潤滑 剤を封入する。The universal joint boot of the present invention has the above-mentioned structure. As a mounting method, when the boot 15 is attached to the universal joint 14, the small diameter portion 17 is attached to the drive shaft 13. The large diameter portion 16 is fitted into the joint case 11, and the fixing portion 24 of the large diameter portion 16 and the fixing portion 24 'of the small diameter portion 17 are tightened to prevent external force from being applied to the bellows portion 20. At the same time, a lubricant such as grease is sealed in the space inside the boot 15.
【００２７】 以上のようにして組立てられたブーツは、車輪軸１２と駆動軸１３との間のジ ョイント角度θが３０°以上、特に最高５０°の角度に屈折したとき、図３に示 す如く大径部１６側から延出した蛇腹部２０が鋭角的に全体が屈折し、第１山部 １８ａの大径部１６側に接続する傾斜面３３ａと大径部１６側から小径部１７側 に延出した内端部外面３４とが面接触して該接触部分の面圧を低下させると共に 、この面接触の傾向は他の傾斜面３３どうしの接触また他の傾斜面３３と山部１ ８との面接触にも同様に見ることができる。The boot thus assembled is shown in FIG. 3 when the joint angle θ between the wheel shaft 12 and the drive shaft 13 is bent at an angle of 30 ° or more, particularly at an angle of up to 50 °. Thus, the bellows portion 20 extending from the large diameter portion 16 side is entirely bent at an acute angle, and the inclined surface 33a connected to the large diameter portion 16 side of the first mountain portion 18a and the large diameter portion 16 side to the small diameter portion 17 side. The inner surface and the outer surface 34 of the inner end portion extending in contact with each other reduce the surface pressure of the contact portion, and the tendency of this surface contact is such that the other inclined surfaces 33 contact each other or the other inclined surface 33 and the mountain portion 1. The same can be seen for surface contact with 8.
【００２８】[0028]
本考案は以上説明したように構成されているので、以下記載されるような効果 を奏する。 即ち、本考案に係るブーツの蛇腹部は、各山部とこれに接続する各谷部との間 の距離はほぼ同一であり、また各谷部と小径側に接続する各山部との半径方向の 段差の比および各山部と各谷部の肉厚比も特定範囲に選定したので、蛇腹部の折 畳み容易性、成形時における脱型操作の容易性等の改良をはかると共に、広角度 の屈折時における蛇腹部の各傾斜面どうしの接触は面接触となるので、接触部分 の面圧が大幅に低下し、且つ接触部分の相対周速度が近似して摩耗による亀裂発 生を未然に防止してブーツの耐久性、寿命を大幅に延長させると同時に生産工程 上における品質の向上をはかることができる。 Since the present invention is configured as described above, it has the following effects. That is, in the bellows portion of the boot according to the present invention, the distance between each crest portion and each trough portion connected thereto is substantially the same, and the radius between each trough portion and each crest portion connected to the small diameter side is the same. Since the ratio of the step difference in the direction and the wall thickness ratio of each crest and each trough were also selected in a specific range, the ease of folding the bellows part, the ease of demolding operation at the time of molding, etc. were improved and wide The contact between the inclined surfaces of the bellows part at the time of bending the angle is a surface contact, so the surface pressure of the contact part is drastically reduced, and the relative peripheral velocity of the contact part is approximated to cause cracking due to wear. In addition, the durability and life of the boot can be significantly extended, and at the same time, the quality of the production process can be improved.
【図１】本考案に係る自在継手用ブーツの一例を示す側
面断面図である。FIG. 1 is a side sectional view showing an example of a universal joint boot according to the present invention.
【図２】図１のＡ部拡大図である。FIG. 2 is an enlarged view of part A in FIG.
【図３】図１のブーツを適用した自在継手に３０度以上
のジョイント角度を付与した状態を示す側面断面図であ
る。3 is a side sectional view showing a state in which a universal joint to which the boot of FIG. 1 is applied is provided with a joint angle of 30 degrees or more.
【図４】（イ）および（ロ）は、図１の蛇腹部の山部と
これに接続する谷部との間の距離異同を説明するための
要部拡大断面図であり、（ハ）は（イ），（ロ）の荷重
−たわみ量の試験結果を示すグラフである。4 (a) and (b) are enlarged cross-sectional views of a main part for explaining the difference in distance between the crest part of the bellows part and the trough part connected thereto in FIG. Is a graph showing the load-deflection amount test results of (a) and (b).
【図５】図１の蛇腹部の蛇腹膜長と山・谷部の半径方向
の長さの比率との関係を示したグラフである。5 is a graph showing the relationship between the bellows length of the bellows part and the ratio of the lengths of the peaks and valleys in the radial direction of FIG. 1. FIG.
【図６】（イ）および（ロ）は、蛇腹部の山部と谷部の
肉厚比と物性との関係のモデル断面形状と計算結果のグ
ラフである。6A and 6B are graphs of a model cross-sectional shape and a calculation result of the relationship between the wall thickness ratio of the peak portion and the valley portion of the bellows portion and the physical properties.
【図７】図１の本考案に係るブーツと図８の従来のブー
ツを適用した自在継手のジョイント角度と各ブーツの寿
命との関係を対比したグラフである。7 is a graph comparing the relationship between the joint angle of the universal joint to which the boot according to the present invention of FIG. 1 and the conventional boot of FIG. 8 are applied and the life of each boot.
【図８】従来のブーツの一例を示す側面断面図である。FIG. 8 is a side sectional view showing an example of a conventional boot.
【図９】図８のブーツを適用した自在継手に３０度以上
のジョイント角度を付与した状態を示す側面断面図であ
る。9 is a side sectional view showing a state in which a universal joint to which the boot of FIG. 8 is applied is provided with a joint angle of 30 degrees or more.
１１ 継手ケース １２ 車輪軸 １３ 駆動軸 １４ 自在継手 １５ ブーツ １６ 大径部 １７ 小径部 １８ 山部 １８ａ 第１山部 １８ｂ 第２山部 １８ｃ 第３山部 １８ｄ 第４山部 １８ｅ 第５山部 １８ｆ 第６山部 １９ 谷部 １９ａ 第１谷部 １９ｂ 第２山部 １９ｃ 第３山部 １９ｄ 第４山部 １９ｅ 第５山部 １９ｆ 第６山部 ２０ 蛇腹部 ２４，２４′ 固定部 ２５，２５′ リブ状突起 ２６，２６′ 凹溝 ２７，２７′ 周溝 ２８，２８′ 締付部材 ３３，３３ａ，３３ｂ，３３ｃ 傾斜面 ３４ 内端部外面 Ｒ 山部の内面側の曲率半径 Ｒ′ 谷部の外面側の曲率半径 11 joint case 12 wheel shaft 13 drive shaft 14 universal joint 15 boot 16 large diameter portion 17 small diameter portion 18 mountain portion 18a first mountain portion 18b second mountain portion 18c third mountain portion 18d fourth mountain portion 18e fifth mountain portion 18f 6th mountain part 19 Valley part 19a 1st valley part 19b 2nd mountain part 19c 3rd mountain part 19d 4th mountain part 19e 5th mountain part 19f 6th mountain part 20 Bellows part 24, 24 'Fixed part 25, 25' Rib-shaped projection 26, 26 'Recessed groove 27, 27' Circumferential groove 28, 28 'Tightening member 33, 33a, 33b, 33c Inclined surface 34 Inner end portion outer surface R Curvature radius R'on the inner surface side of the mountain portion Radius of curvature on the outer surface side
───────────────────────────────────────────────────── フロントページの続き (72)考案者 大野 宏 愛知県西加茂郡三好町大字打越字生賀山３ 番地 東洋ゴム工業株式会社自動車部品技 術センター内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Ono 3rd Ikagayama, Uchikoshi, Miyoshi-cho, Nishikamo-gun, Aichi Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center
Claims (2)
継手ケースとにわたり前記自在継手を被覆して取付けら
れ、該継手ケースとの固定部を有する大径部から前記駆
動軸との固定部を有する小径部にわたってこれら複数個
の各山部の直径が順次小さくなるように形成された蛇腹
部を有する広角度自在継手用ブーツにおいて、 （１）各山部とこれに接続する各谷部との間の距離はほ
ぼ同一であり、 （２）各谷部と該谷部から小径側に接続する各山部との
半径方向の段差の比は２６〜３６％の範囲内にあって、 （３）各山部の肉厚は、該山部に接続する各谷部の肉厚
の６０〜１００％の範囲内にある ことを特徴とする広角度自在継手用ブーツ。1. A drive shaft connected through a universal joint,
The diameter of each of the plurality of peaks is sequentially extended from a large diameter portion having a fixed portion to the joint case to a small diameter portion having a fixed portion to the drive shaft. In a boot for a wide-angle universal joint having a bellows portion formed to be small, (1) the distance between each crest portion and each trough portion connected thereto is substantially the same, (2) each trough portion And the ratio of the step difference in the radial direction between the valley portion and each mountain portion connected to the small diameter side is in the range of 26 to 36%, and (3) the wall thickness of each mountain portion is connected to the mountain portion. A boot for a wide-angle universal joint, which is in the range of 60 to 100% of the wall thickness of each valley.
側のそれぞれの曲率半径がほぼ等しくなるように形成し
たことを特徴とする請求項１記載の広角度自在継手用ブ
ーツ。2. The boot for a wide-angle universal joint according to claim 1, wherein the bellows portion is formed so that the respective radii of curvature on the inner surface side of each crest and on the outer surface side of each trough are substantially equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4392093U JPH0710561U (en) | 1993-07-16 | 1993-07-16 | Wide angle universal joint boot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4392093U JPH0710561U (en) | 1993-07-16 | 1993-07-16 | Wide angle universal joint boot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0710561U true JPH0710561U (en) | 1995-02-14 |
Family
ID=12677154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4392093U Pending JPH0710561U (en) | 1993-07-16 | 1993-07-16 | Wide angle universal joint boot |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0710561U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007032301A1 (en) | 2005-09-16 | 2007-03-22 | Ntn Corporation | Boot for constant velocity universal joint |
| KR20180115301A (en) * | 2016-03-31 | 2018-10-22 | 게케엔 드리펠린 인터나쇼날 게엠베하 | Boot with ventilation |
-
1993
- 1993-07-16 JP JP4392093U patent/JPH0710561U/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007032301A1 (en) | 2005-09-16 | 2007-03-22 | Ntn Corporation | Boot for constant velocity universal joint |
| KR20180115301A (en) * | 2016-03-31 | 2018-10-22 | 게케엔 드리펠린 인터나쇼날 게엠베하 | Boot with ventilation |
| CN109312861A (en) * | 2016-03-31 | 2019-02-05 | Gkn动力传动国际有限公司 | Casing with air-breather |
| JP2019513209A (en) * | 2016-03-31 | 2019-05-23 | ゲーカーエン ドライブライン インターナショナル ゲゼルシャフト ミト ベシュレンクテル ハフツングＧｋｎ Ｄｒｉｖｅｌｉｎｅ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｇｍｂｈ | Boots with ventilation means |
| CN109312861B (en) * | 2016-03-31 | 2020-10-27 | Gkn动力传动国际有限公司 | Cannula with venting means |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19991130 |