JP2001003950A - Constant velocity joint boot - Google Patents
Constant velocity joint bootInfo
- Publication number
- JP2001003950A JP2001003950A JP11177636A JP17763699A JP2001003950A JP 2001003950 A JP2001003950 A JP 2001003950A JP 11177636 A JP11177636 A JP 11177636A JP 17763699 A JP17763699 A JP 17763699A JP 2001003950 A JP2001003950 A JP 2001003950A
- Authority
- JP
- Japan
- Prior art keywords
- constant velocity
- velocity joint
- diameter cylindrical
- joint boot
- bellows
- 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)
- Diaphragms And Bellows (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車の等速ジョ
イントの防塵や防水のために用いられる等速ジョイント
ブーツに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant velocity joint boot used for dustproofing and waterproofing a constant velocity joint of an automobile.
【０００２】[0002]
【従来の技術】従来の等速ジョイントブーツの一例につ
いて説明する。図２の（ａ）に示すように、等速ジョイ
ントブーツは、蛇腹部１０１と、蛇腹部１０１の両端に
それぞれ連設された小径筒状部１０２および大径筒状部
１０８とを有し、小径筒状部１０２を駆動軸１０６に嵌
合するとともに大径筒状部１０８を等速ジョイントのハ
ウジング１０９に嵌合し、両筒状部１０２，１０８を締
め付け金具１２０（図３に示す）により締め付けて固定
するように構成されている。そして、駆動軸１０６の複
数の突条１０７が設けられた部分が嵌挿される小径筒状
部１０２は、図２の（ｂ）に示すように、外周面に締め
付け金具が外嵌される固定用凹部１０３を有するととも
に、小径筒状部１０２に隣接する蛇腹部１０１の内径面
には位置決めのための突部１０５が突設されている。2. Description of the Related Art An example of a conventional constant velocity joint boot will be described. As shown in FIG. 2A, the constant velocity joint boot has a bellows portion 101, a small-diameter tubular portion 102 and a large-diameter tubular portion 108 respectively connected to both ends of the bellows portion 101, The small-diameter tubular portion 102 is fitted to the drive shaft 106, and the large-diameter tubular portion 108 is fitted to the constant-velocity joint housing 109, and the two tubular portions 102, 108 are fastened by fastening fittings 120 (shown in FIG. 3). It is configured to be fastened and fixed. Then, as shown in FIG. 2B, the small-diameter cylindrical portion 102 into which the portion of the drive shaft 106 provided with the plurality of protrusions 107 is fitted has a fastening fitting externally fitted to the outer peripheral surface thereof. A projection 105 for positioning is provided on the inner surface of the bellows 101 adjacent to the small-diameter cylindrical portion 102.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の技術では、
等速ジョイントに装着された等速ジョイントブーツは、
長時間使用すると、蛇腹部と小径筒状部の境界部に亀裂
が発生して破損するに至るという問題点があった。In the above prior art,
Constant velocity joint boots attached to constant velocity joints,
When used for a long time, there is a problem that a crack is generated at a boundary portion between the bellows portion and the small-diameter cylindrical portion, resulting in breakage.
【０００４】一般的に等速ジョイントブーツは、実際の
使用に際して、シール性、対磨耗性、耐久性、耐低温
性、耐膨張性（高速回転時）などの諸条件を満足させな
ければならない。In general, constant velocity joint boots must satisfy various conditions such as sealability, abrasion resistance, durability, low temperature resistance, and expansion resistance (at high speed rotation) in actual use.
【０００５】ところで、熱可塑性樹脂をプレスブロー成
形、押出しブロー成形、射出ブロー成形または射出成形
して製造される樹脂製の等速ジョイントブーツは、加硫
工程を経て製造されるゴム製の等速ジョイントブーツに
比べ、重量低減が図れ、製造工程が容易となることか
ら、各種の自動車の等速ジョイントブーツに採用される
ようになった。[0005] By the way, a constant velocity joint boot made of a resin manufactured by press blow molding, extrusion blow molding, injection blow molding or injection molding of a thermoplastic resin is made of a rubber constant velocity joint manufactured through a vulcanization step. Compared to joint boots, they have been adopted for constant velocity joint boots of various automobiles because they can reduce the weight and facilitate the manufacturing process.
【０００６】等速ジョイントブーツが実際に使用された
際の耐久性を実験で予測するテストとして、各種の試験
条件が想定されるが、なかでもデファレンシャルギヤを
介してエンジンより回転駆動される駆動軸と、車輪とと
もに回転する車軸との屈曲状態を一定角度とし、その状
態で軸を回転させ等速ジョイントブーツの状態を観察す
る耐久テストがある。このテストは特に等速ジョイント
ブーツの小径部側の壁面に応力負荷を与える。As a test for predicting the durability of the constant velocity joint boot when it is actually used, various test conditions are assumed. Among them, a drive shaft that is rotationally driven from an engine via a differential gear is used. In addition, there is a durability test in which the bending state of the axle that rotates with the wheels is made a fixed angle, and the axle is rotated in that state to observe the state of the constant velocity joint boot. This test particularly applies a stress load to the wall surface on the small diameter side of the constant velocity joint boot.
【０００７】以下に応力負荷の状態を図３に基づき詳述
する。Hereinafter, the state of the stress load will be described in detail with reference to FIG.
【０００８】等速ジョイントブーツが屈曲する際、軸受
けの屈曲点は等速ジョイントブーツの中心ではなく車軸
側（大径筒状部１０８側）である。そして、屈曲状態に
おいては一般的に、角度の狭まる側（図示下方側）は圧
縮応力が作用し、角度の広がる側（図示上方側）は引張
応力が作用する。When the constant velocity joint boot bends, the bending point of the bearing is not at the center of the constant velocity joint boot but on the axle side (the large-diameter cylindrical portion 108 side). In the bent state, generally, a compressive stress acts on the side where the angle becomes narrower (lower side in the figure), and a tensile stress acts on the side where the angle becomes wider (the upper side in the figure).
【０００９】すなわち角度の狭まる側では、蛇腹部１０
１の大径部側１０１ａにおいて、山部が圧縮され谷部は
内方に引き込まれる。しかし、蛇腹部１０１の小径部側
１０１ｂにおいて、角度の狭まる側は、大径部側１０１
ａの谷部が引き込まれるために、小径筒状部１０２に隣
接する小径部側１０１ｂの第一山部１１１ａは、角度の
狭まる側であるにもかかわらず大径部側１０１ａに倒れ
込むこととなる。That is, the bellows 10
On the large-diameter portion side 101a, the peaks are compressed and the valleys are drawn inward. However, in the small-diameter portion side 101b of the bellows portion 101, the side where the angle narrows is the large-diameter portion side 101b.
Since the valley of a is drawn in, the first mountain portion 111a of the small diameter portion 101b adjacent to the small diameter cylindrical portion 102 falls down to the large diameter portion 101a even though the angle is reduced. .
【００１０】一方、角度の広がる側では、蛇腹部１０１
の大径部側１０１ａにおいて引張応力が作用するが、小
径筒状部１０２に隣接する小径部側１０１ｂの第一山部
１１１ｂは、反対側で大径部側１０１ａに倒れ込んでい
ることから角度の広がる側であるにもかかわらず小径筒
状部１０２側に倒れ込むこととなる。On the other hand, the bellows 101
Although a tensile stress acts on the large-diameter portion side 101a of the small-diameter portion 101b, the first peak portion 111b of the small-diameter portion side 101b adjacent to the small-diameter cylindrical portion 102 falls on the opposite side to the large-diameter portion side 101a. Despite being the expanding side, it falls down to the small-diameter cylindrical portion 102 side.
【００１１】上記のように、回転運動により、小径部側
１０１ｂの第一山部１１１ａ，１１１ｂは大径部側１０
１ａに倒れこむ状態と小径筒状部側に倒れ込む状態を交
互に繰り返すこととなり、その結果、小径筒状部１０２
の固定用凹部１０３の蛇腹部側隅部１０５に繰り返し応
力が作用するものと考えられる。As described above, the first ridges 111a and 111b on the small-diameter portion 101b are rotated by the rotary motion so that
1a and the state of falling into the small-diameter cylindrical portion side are alternately repeated. As a result, the small-diameter cylindrical portion 102
It is considered that stress is repeatedly applied to the bellows-side corner 105 of the fixing recess 103.
【００１２】本発明は、上記従来の技術の有する問題点
および上記知見に鑑みてなされたものであって、小径筒
状部と蛇腹部の境界部に応力が集中することのない耐久
性のある等速ジョイントブーツを実現することを目的と
するものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art and the above findings, and has a durable state in which stress is not concentrated on the boundary between the small-diameter cylindrical portion and the bellows portion. It is intended to realize a constant velocity joint boot.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成するた
め、本発明の等速ジョイントブーツは、蛇腹部と、前記
蛇腹部の一端側に連設された小径筒状部と、前記蛇腹部
の他端側に連設された大径筒状部を有し、少なくとも前
記小径筒状部の外周面に固定用凹部が形成された等速ジ
ョイントブーツにおいて、前記小径筒状部の外周面に形
成された前記固定用凹部における蛇腹部側隅部を湾曲面
とし、かつ前記固定用凹部の軸方向長さＬと前記湾曲面
の曲率半径ｒとの比Ｌ／ｒが７〜１５の範囲以内である
ことを特徴とするものである。To achieve the above object, a constant velocity joint boot according to the present invention comprises a bellows portion, a small-diameter tubular portion connected to one end of the bellows portion, and a bellows portion. A constant velocity joint boot having a large-diameter cylindrical portion continuously provided on the other end side and having a fixing recess formed at least on the outer peripheral surface of the small-diameter cylindrical portion, formed on the outer peripheral surface of the small-diameter cylindrical portion. The bellows-side corner portion of the fixing recess is a curved surface, and the ratio L / r between the axial length L of the fixing recess and the radius of curvature r of the curved surface is within a range of 7 to 15. It is characterized by having.
【００１４】また、熱可塑性樹脂により一体成形された
ものとする。Further, it is assumed that it is integrally formed of a thermoplastic resin.
【００１５】[0015]
【発明の実施の形態】本発明の実施の形態を図面に基づ
いて説明する。Embodiments of the present invention will be described with reference to the drawings.
【００１６】図１は一実施の形態による等速ジョイント
ブーツを示し、（ａ）はその平面図、（ｂ）は（ａ）の
円Ａで囲んだ部分の拡大部分断面図である。FIG. 1 shows a constant velocity joint boot according to an embodiment, in which (a) is a plan view thereof, and (b) is an enlarged partial sectional view of a portion surrounded by a circle A in (a).
【００１７】この等速ジョイントブーツは、熱可塑性樹
脂より一体成形されたものであって、複数の山部１ｃお
よび谷部１ｄからなる蛇腹部１と、蛇腹部１の一端側で
ある立上り壁１ａの立上り壁基部１ｂに連設された小径
筒状部２と、蛇腹部１の他端側に連設された大径筒状部
３を備えている。This constant velocity joint boot is integrally formed of a thermoplastic resin, and has a bellows portion 1 composed of a plurality of peaks 1c and valleys 1d, and a rising wall 1a at one end of the bellows portion 1. And a large-diameter cylindrical portion 3 connected to the other end of the bellows portion 1.
【００１８】本発明において、等速ジョイントブーツを
構成する熱可塑性樹脂としては、ポリエステル系、ポリ
ウレタン系、ポリアミド系、ポリオレフィン系などの熱
可塑性樹脂エラストマーの単体またはブレンド体が用い
られる。In the present invention, as the thermoplastic resin constituting the constant velocity joint boot, a simple substance or a blend of a thermoplastic resin elastomer such as polyester, polyurethane, polyamide, and polyolefin is used.
【００１９】また、等速ジョイントブーツを一体成形す
るには、プレスブロー成形、押出しブロー成形、射出ブ
ロー成形、射出成形等の公知の成形方法が用いられる。In order to integrally mold the constant velocity joint boot, known molding methods such as press blow molding, extrusion blow molding, injection blow molding, and injection molding are used.
【００２０】本実施の形態において、立上り壁１ａは立
上り壁基部１ｂの肉厚が他の部分よりも厚く、立上り壁
基部１ｂから蛇腹部１の山部１ｃへ向かって肉厚が漸減
しており、かつ立上り壁基部１ｂの内周面には位置決め
用突部６が突設されている。In the present embodiment, the rising wall 1a has a thickness of the rising wall base 1b larger than other portions, and the thickness gradually decreases from the rising wall base 1b toward the peak 1c of the bellows portion 1. A positioning projection 6 is provided on the inner peripheral surface of the rising wall base 1b.
【００２１】また、小径筒状部２の外周面には、開口端
部２ａの近傍に突設された開口縁部２ｂと立上り壁基部
１ｂとの間に固定用凹部４が形成されている。そして、
この小径筒状部２の固定用凹部４の蛇腹部側隅部５を湾
曲面とし、かつ固定用凹部４の軸方向長さＬと湾曲面の
曲率半径ｒとの比Ｌ／ｒが７〜１５の範囲以内に設定さ
れている。On the outer peripheral surface of the small-diameter cylindrical portion 2, a fixing recess 4 is formed between an opening edge 2b protruding near the opening end 2a and a rising wall base 1b. And
The bellows-side corner 5 of the fixing recess 4 of the small-diameter cylindrical portion 2 is a curved surface, and the ratio L / r of the axial length L of the fixing recess 4 to the radius of curvature r of the curved surface is 7 to 7. It is set within the range of 15.
【００２２】本発明において、小径筒状部の固定用凹部
における蛇腹部側隅部の湾曲面の曲率半径ｒは、固定用
凹部の軸方向長さＬとの比Ｌ／ｒで特定される。In the present invention, the radius of curvature r of the curved surface at the bellows-side corner of the fixing concave portion of the small-diameter cylindrical portion is specified by the ratio L / r to the axial length L of the fixing concave portion.
【００２３】すなわち、発明者の知見によれば、小径筒
状部における固定用凹部の軸方向長さＬは、実質的に等
速ジョイントブーツ全体の長さにかわらず締め付けバン
ドの幅によって規定され、湾曲面の曲率半径ｒは等速ジ
ョイントブーツの大きさにかかわらず小径筒状部におけ
る固定用凹部の軸方向の長さＬとの相関関係によって規
定される。That is, according to the knowledge of the inventor, the axial length L of the fixing recess in the small-diameter cylindrical portion is defined by the width of the tightening band regardless of substantially the entire length of the constant velocity joint boot. The curvature radius r of the curved surface is defined by the correlation with the axial length L of the fixing concave portion in the small-diameter cylindrical portion regardless of the size of the constant velocity joint boot.
【００２４】そして、発明者の実験の結果、Ｌ／ｒを特
定の範囲に規定することにより、締め付けバンドにて締
め付けられた固定用凹部の蛇腹部側隅部に作用する繰返
し応力の状態を抑制することが見いだされた。As a result of the experiment by the inventor, the condition of the repetitive stress acting on the bellows-side corner of the fixing recess tightened by the tightening band is suppressed by defining L / r to a specific range. It was found to do.
【００２５】さらに、等速ジョイントブーツは、回転運
動により蛇腹部の小径部側第一山部は大径部側に倒れ込
む状態と小径筒状部側に倒れ込む状態を交互に繰り返す
こととなるが、上記の倒れ込む状態は蛇腹部の小径部側
第一山部の構成によっても影響される。発明者の実験に
よれば、蛇腹部の小径部側第一山部の外径Ｄ1 を固定用
凹部外径Ｄ2 の１．７倍とし、蛇腹部の小径部側第一山
部の立上がり角度θを４５度以上に構成することによ
り、倒れ込みが抑制できることが見いだされた。Further, the constant velocity joint boot alternately repeats a state in which the first peak portion on the small diameter portion side of the bellows portion falls down toward the large diameter portion side and a condition where it falls down on the small diameter cylindrical portion side by the rotational motion. The above-mentioned falling state is also affected by the configuration of the first peak portion on the small diameter portion side of the bellows portion. According to the experiments of the inventors, the outer diameter D 1 of the small diameter portion side first crest portion of the bellows part and 1.7 times the fixing recesses outer diameter D 2, the rising of the small diameter portion side first crest portion of the bellows portion It has been found that by configuring the angle θ to be 45 degrees or more, the fall can be suppressed.
【００２６】本発明は、耐久テストを行なって試行錯誤
によってその有効性が確認されたものであり、以下にそ
の実験結果について説明する。The effectiveness of the present invention has been confirmed by trial and error through a durability test. The experimental results will be described below.
【００２７】（実験に用いた等速ジョイントブーツの構
成） 形状：図１に示したものと同様の形状 樹脂：ポリエステル系エラストマー（ＤＳＭ社製「アニ
テル」） 蛇腹部の平均肉厚：１．７ｍｍ 重量：４５ｇ 成形品の長さ：１１１ｍｍ 立上り壁の傾斜角度θ：６３度 蛇腹部の小径部側第一山部の外径Ｄ1 と小径筒状部の固
定用凹部の外径Ｄ2 との比（Ｄ1 ／Ｄ2 ）：２．１ 蛇腹部の山数：６山 蛇腹部の最大山部の外径：８０ｍｍ 蛇腹部の最小山部の外径：４７ｍｍ 蛇腹部の谷部：略Ｕ字状の溝部を有する 大径筒状部の固定用凹部の長さ ：１０．５ｍｍ 小径筒状部の固定用凹部の長さＬ：１０．５ｍｍ 小径筒状部の固定用凹部の内径 ：１９．４ｍｍ 小径筒状部の固定用凹部の肉厚 ：２ｍｍ 小径筒状部の立上り基部の肉厚 ：３．６ｍｍ(Construction of constant velocity joint boot used in experiment) Shape: Same shape as that shown in FIG. 1 Resin: Polyester elastomer (“anitel” manufactured by DSM) Average thickness of bellows: 1.7 mm Weight: 45 g Molded product length: 111 mm Inclination angle θ of the rising wall: 63 degrees The outer diameter D 1 of the first hill portion on the small diameter side of the bellows portion and the outer diameter D 2 of the fixing concave portion of the small diameter cylindrical portion. Ratio (D 1 / D 2 ): 2.1 Number of bellows peaks: 6 peaks Outer diameter of the largest peak of bellows: 80 mm Outer diameter of minimum peak of the bellows: 47 mm Valley of bellows: approximately U Length of the fixing recess of the large-diameter tubular portion having a U-shaped groove portion: 10.5 mm Length of the fixing recess of the small-diameter tubular portion L: 10.5 mm Inner diameter of the fixing recess of the small-diameter tubular portion: 19 .4 mm Thickness of fixing recess of small-diameter cylindrical part: 2 mm Thickness of rising base of small-diameter cylindrical part: 3.6 m
【００２８】（実験条件）上記構成の等速ジョイントブ
ーツを小径筒状部の固定用凹部における蛇腹部隅部の湾
曲面の曲率半径ｒを表１に示すとおりに設定した８種類
のサンプルを準備しておき、各サンプルを等速ジョイン
トに装着し、等速ジョイントブーツ内部にグリースを充
填した状態で、大径筒状部および小径筒状部のそれぞれ
の固定用凹部をバンドで締め付けて固定した。なお、装
着時における等速ジョイントブーツの全長は８４ｍｍに
設定した。(Experimental Conditions) Eight types of samples were prepared in which the constant velocity joint boot having the above-described configuration was set as shown in Table 1 with the radius of curvature r of the curved surface of the bellows corner in the fixing recess of the small-diameter cylindrical portion. Then, each sample was mounted on a constant velocity joint, and the grease was filled inside the constant velocity joint boot, and the fixing concave portions of the large-diameter tubular portion and the small-diameter tubular portion were fastened and fixed with a band. . The total length of the constant velocity joint boot at the time of mounting was set to 84 mm.
【００２９】そして、等速ジョイントのハウジングと駆
動軸との間の屈曲角度を２５度に設定した状態で、２３
℃の環境温度の雰囲気中で、１０００ｒｐｍの回転速度
で、１０００時間連続回転後の等速ジョイントブーツの
状態を評価した。各サンプルの評価結果を表１に示す。Then, with the bending angle between the housing of the constant velocity joint and the drive shaft set at 25 degrees, 23
The state of the constant velocity joint boot after continuous rotation for 1000 hours at a rotation speed of 1000 rpm in an atmosphere at an environmental temperature of ° C was evaluated. Table 1 shows the evaluation results of each sample.
【００３０】[0030]
【表１】 [Table 1]
【００３１】次に、表１に示す評価について後述する。Next, the evaluation shown in Table 1 will be described later.
【００３２】サンプル１〜サンプル３の場合、小径筒状
部における固定用凹部における蛇腹側隅部から開口縁部
にかけて延びる小さな亀裂が、等速ジョイントブーツの
外周に多く発生する。そのまま試験を続行した場合に、
その亀裂が成長し、ついには、立上り基部まで達成する
場合がある。その亀裂が肉厚方向に成長していき、破損
に至る場合がある。In the case of Samples 1 to 3, small cracks extending from the bellows-side corner to the opening edge of the fixing recess in the small-diameter cylindrical portion often occur on the outer periphery of the constant velocity joint boot. If you continue the test,
The crack may grow and eventually reach the base of the rise. The crack may grow in the thickness direction and may be damaged.
【００３３】この原因は、屈曲角度を一定の値に固定し
た状態で連続回転すると、大径筒状部側に比べ小径筒状
部側に圧縮応力と引張り応力の歪みが著しく作用し、小
径筒状部に覆い被さるように蛇腹部の一部である立上り
壁が繰り返し変形し固定用凹部の蛇腹部側隅部から立上
り壁基部にかけて歪み応力が集中するものと推定され
る。この歪み応力の集中は等速ジョイントブーツがコン
パクトになればなるほど大きくなる傾向にある。また、
発明者の知見によれば、屈曲角度を変化させながら回転
耐久実験を行なった場合より、一定の屈曲角度を維持し
ながら回転耐久実験を行なった場合のほうが、顕著に現
れる。This is because, when the bending angle is fixed at a fixed value and the continuous rotation is performed, the distortion of the compressive stress and the tensile stress acts remarkably on the small-diameter cylindrical portion as compared with the large-diameter cylindrical portion, and the small-diameter cylindrical portion is distorted. It is presumed that the rising wall, which is a part of the bellows portion, is repeatedly deformed so as to cover the shape-like portion, and the strain stress is concentrated from the bellows side corner of the fixing recess to the rising wall base. The concentration of the strain stress tends to increase as the constant velocity joint boot becomes more compact. Also,
According to the knowledge of the inventor, the case where the rotation endurance experiment is performed while maintaining a constant bending angle appears more remarkably than the case where the rotation endurance experiment is performed while changing the bending angle.
【００３４】サンプル４〜サンプル７の場合、亀裂およ
び破損は認められなかった。また、シール性やバンド装
着性も良好であった。In the case of Samples 4 to 7, cracks and breakage were not observed. In addition, the sealing property and the band mounting property were also good.
【００３５】サンプル８の場合、充填されたグリースが
小径筒状部より漏れた。この原因はバンドにて等速ジョ
イントブーツを固定する際、蛇腹部側隅部の曲率半径が
大きすぎるため、バンドが駆動軸に対して平行に取付け
られず、バンドに正常な締付け力（固定力）が得られな
かったことによりシール性能が失われたものと推定され
る。In the case of Sample 8, the filled grease leaked from the small-diameter cylindrical portion. The cause is that when fixing the constant velocity joint boot with the band, the radius of curvature of the bellows side corner is too large, so that the band cannot be mounted parallel to the drive shaft, and the band has a normal tightening force (fixing force). ) Was not obtained, it is estimated that the sealing performance was lost.
【００３６】また、蛇腹部側隅部とバンドとが干渉する
ことによりバンドの装着作業性にも問題が発生した。Further, the interference between the bellows-side corner and the band caused a problem in the band mounting workability.
【００３７】[0037]
【発明の効果】本発明は上述のとおり構成されているた
め、次に記載するような効果を奏する。Since the present invention is configured as described above, the following effects can be obtained.
【００３８】小径筒状部の固定用凹部における蛇腹部側
隅部に応力が集中しないため、亀裂が発生して破損する
に至るおそれがなく、シール性が維持されるとともに耐
久性が著しく向上する。Since stress is not concentrated on the bellows-side corner of the fixing recess of the small-diameter cylindrical portion, there is no possibility of cracking and breakage, and the sealing performance is maintained and the durability is significantly improved. .
【図１】一実施の形態による等速ジョイントブーツを示
し、（ａ）は模式平面図、（ｂ）は（ａ）の円Ａで囲ん
だ部分の模式部分断面図である。1A and 1B show a constant velocity joint boot according to an embodiment, wherein FIG. 1A is a schematic plan view, and FIG. 1B is a schematic partial cross-sectional view of a portion surrounded by a circle A in FIG.
【図２】従来の等速ジョイントブーツの一例を示し、
（ａ）は等速ジョイントに装着した状態を示す模式断面
図、（ｂ）は（ａ）の円Ａで囲んだ部分の模式部分断面
図である。FIG. 2 shows an example of a conventional constant velocity joint boot,
(A) is a schematic sectional view showing a state of being attached to a constant velocity joint, and (b) is a schematic partial sectional view of a portion surrounded by a circle A in (a).
【図３】等速ジョイントに装着された等速ジョイントブ
ーツの屈曲状態を示す模式斜視図である。FIG. 3 is a schematic perspective view showing a bent state of a constant velocity joint boot attached to the constant velocity joint.
１ 蛇腹部 １ａ 立上り壁 １ｂ 立上り壁基部 １ｃ 山部 １ｄ 谷部 ２ 小径筒状部 ２ａ 開口端部 ２ｂ 開口縁部 ３ 大径筒状部 ４，７ 固定用凹部 ５ 蛇腹部側隅部 ６ 位置決め用突部 DESCRIPTION OF SYMBOLS 1 Bellows part 1a Rise wall 1b Rise wall base 1c Crest part 1d Valley part 2 Small diameter cylindrical part 2a Open end 2b Open edge 3 Large diameter cylindrical part 4,7 Fixing recess 5 Bellows side corner 6 Positioning Protrusion
Claims (2)
れた小径筒状部と、前記蛇腹部の他端側に連設された大
径筒状部を有し、少なくとも前記小径筒状部の外周面に
固定用凹部が形成された等速ジョイントブーツにおい
て、 前記小径筒状部の外周面に形成された前記固定用凹部に
おける蛇腹部側隅部を湾曲面とし、かつ前記固定用凹部
の軸方向長さＬと前記湾曲面の曲率半径ｒとの比Ｌ／ｒ
が７〜１５の範囲以内であることを特徴とする等速ジョ
イントブーツ。A bellows portion, a small-diameter tubular portion connected to one end of the bellows portion, and a large-diameter tubular portion connected to the other end of the bellows portion; In a constant velocity joint boot in which a fixing concave portion is formed on an outer peripheral surface of a cylindrical portion, a bellows side corner portion of the fixing concave portion formed on an outer peripheral surface of the small-diameter cylindrical portion is a curved surface, and the fixing is performed. Ratio L / r between the axial length L of the concave portion for use and the radius of curvature r of the curved surface.
The constant velocity joint boot, wherein is within a range of 7 to 15.
を特徴とする請求項１記載の等速ジョイントブーツ。2. The constant velocity joint boot according to claim 1, wherein the constant velocity joint boot is integrally formed of a thermoplastic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11177636A JP2001003950A (en) | 1999-06-24 | 1999-06-24 | Constant velocity joint boot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11177636A JP2001003950A (en) | 1999-06-24 | 1999-06-24 | Constant velocity joint boot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001003950A true JP2001003950A (en) | 2001-01-09 |
Family
ID=16034468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11177636A Pending JP2001003950A (en) | 1999-06-24 | 1999-06-24 | Constant velocity joint boot |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001003950A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7422717B2 (en) | 2002-04-08 | 2008-09-09 | Toyo Tire & Rubber Co., Ltd. | Method of producing joint boot made of resin |
| JP2009097630A (en) * | 2007-10-17 | 2009-05-07 | Ntn Corp | Boot mounting structure for constant velocity universal joint and silicone boot for constant velocity universal joint |
| US7753380B2 (en) | 2007-03-29 | 2010-07-13 | Toyoda Gosei Co., Ltd. | Boot for constant-velocity universal joint |
| JP2012207767A (en) * | 2011-03-30 | 2012-10-25 | Toyo Tire & Rubber Co Ltd | Rubber boot for constant velocity joint |
-
1999
- 1999-06-24 JP JP11177636A patent/JP2001003950A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7422717B2 (en) | 2002-04-08 | 2008-09-09 | Toyo Tire & Rubber Co., Ltd. | Method of producing joint boot made of resin |
| US7753380B2 (en) | 2007-03-29 | 2010-07-13 | Toyoda Gosei Co., Ltd. | Boot for constant-velocity universal joint |
| JP2009097630A (en) * | 2007-10-17 | 2009-05-07 | Ntn Corp | Boot mounting structure for constant velocity universal joint and silicone boot for constant velocity universal joint |
| JP2012207767A (en) * | 2011-03-30 | 2012-10-25 | Toyo Tire & Rubber Co Ltd | Rubber boot for constant velocity joint |
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