JP2015137682A - Constant velocity joint boot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant velocity joint boot capable of restricting occurrence of abrasion sound from bellows of the boot at the time of operation of the constant velocity joint.SOLUTION: This invention relates to a constant velocity joint boot 70 in which a bellows part is formed with several crest parts 71a and so on formed continuously in such a way that an outer diameter with a central axis line being applied as a center when a joint angle is 0° becomes small from a large diameter fitting side toward a small diameter fitting side, intermediate protrusions 74a and so on are protruded toward the crest part of the small diameter side in such a way that the outer diameters φD1 and so on of the annular surfaces 76a and so on may become the same diameter as the outer diameters φd1 and so on of the crest parts at the facing small diameter side on a slant surface at the outer circumferential side connecting the crests T1 and so on of the crest parts at the large diameter side and bottoms at trough parts between the crest parts 71a and so on of the large diameter side and crest parts 71b and so on at the small diameter side adjacent to the crest parts at the large diameter side. When the bellows part shrink, they are contacted with the slant surfaces of the outer circumferential side of the crest parts of the facing small diameter side so as to restrict a contact between a slant surface at the outer circumferential side from the top point of the crest part of the large diameter side to the intermediate protrusion and a slant surface of the outer circumferential side of the crest part at the facing small diameter side.

Description

本発明は、等速ジョイント用ブーツに関する。   The present invention relates to a constant velocity joint boot.

従来、二部材間に装着され二部材の相対移動に追従した動作を可能とするブーツという部材がある。ところで、近年、そのようなブーツのうち、特許文献１に示されるような等速ジョイント用ブーツでは、小型化が求められている。このため、等速ジョイント用ブーツの小型化を実現させるため、例えばブーツの全長は、短縮される必要がある。この場合、等速ジョイントの大きな作動角を満足させるため、ブーツには、短い全長のなかで多くの山部と谷部とが、連続して形成される必要がある。このように、多くの山部と谷部とが、連続して形成されることにより等速ジョイントが屈曲され大きな作動角度で作動された際には、屈曲部分の外側では、山部と谷部が充分伸長し、必要な長さを確保することができる。なお、このような等速ジョイント用ブーツは、通常、大径部材と小径部材とを接続するために、大径部材側から小径部材側に向かって山部の外径が徐々に縮径されて形成されている。   2. Description of the Related Art Conventionally, there is a member called a boot that is mounted between two members and enables an operation that follows the relative movement of the two members. By the way, in recent years, among such boots, the constant velocity joint boot as shown in Patent Document 1 is required to be downsized. For this reason, in order to realize downsizing of the constant velocity joint boot, for example, the entire length of the boot needs to be shortened. In this case, in order to satisfy a large operating angle of the constant velocity joint, the boot needs to be continuously formed with many peaks and valleys within a short overall length. In this way, when the constant velocity joint is bent and operated at a large operating angle by continuously forming many peaks and valleys, the peaks and valleys are outside the bent portion. Can be sufficiently stretched to ensure the required length. Such a constant velocity joint boot usually has an outer diameter gradually reduced from the large diameter member side toward the small diameter member side in order to connect the large diameter member and the small diameter member. Is formed.

特開２００３−４０６３号公報JP 2003-4063 A

しかしながら、上記で説明した小型化された等速ジョイント用ブーツは、多くの山部と谷部とを連続して有している。このため、等速ジョイントが屈曲され大きな作動角度で作動されたときの屈曲部分の内側の縮み部では、蛇腹が折り重なって収縮し、隣り合う山部を含む外周面同士が全面で接触する場合がある。このとき、隣り合う各山部は、外径が異なっているので、等速ジョイントの作動に伴って回転される際の周速が異なる。これにより、各山部同士が接触すると、当該周速差によって各山部間ですべりが生じ擦過音が発生する虞がある。   However, the downsized constant velocity joint boot described above has many peaks and valleys continuously. For this reason, when the constant velocity joint is bent and operated at a large operating angle, the bellows folds and contracts at the contracted portion inside the bent portion, and the outer peripheral surfaces including the adjacent peak portions may contact each other over the entire surface. is there. At this time, since the adjacent ridges have different outer diameters, the peripheral speeds when rotating with the operation of the constant velocity joint are different. Thereby, when each mountain part contacts, there exists a possibility that a slip may generate | occur | produce between each mountain part by the said peripheral speed difference, and a noise may generate | occur | produce.

本発明は、このような事情に鑑みてなされたものであり、等速ジョイント作動時におけるブーツの蛇腹部からの擦過音の発生を抑制可能な等速ジョイント用ブーツを提供することを目的とする。   This invention is made in view of such a situation, and it aims at providing the boot for constant velocity joints which can suppress generation | occurrence | production of the abrasion noise from the bellows part of the boot at the time of constant velocity joint operation | movement. .

（請求項１）本発明に係る等速ジョイント用ブーツは、大径部材の端部に固定される大径取付部、前記大径取付部より小径の軸部材に固定される小径取付部、および前記大径取付部と前記小径取付部との間で山部と谷部とを交互に連続して形成された蛇腹部、を備える等速ジョイント用ブーツであって、前記蛇腹部では、ジョイント角０°のときの前記蛇腹部の中心軸線を中心とする外径が前記大径取付部側から前記小径取付部側に向かって小さくなるよう、複数の前記山部が連続して形成され、前記複数の山部のうち大径側の山部と、前記大径側の山部に隣接する小径側の山部との間において、前記大径側の山部の頂点と前記谷部の谷底とを接続する外周側の斜面上に、前記蛇腹部の前記中心軸線を中心とする環状面の外径が向かい合う前記小径側の山部の外径と同じ径になるように中間突出部が前記小径側の山部に向かって突設され、前記中間突出部は、前記蛇腹部が縮んだ場合に、前記環状面が、向かい合う前記小径側の山部の外周側の斜面と接触することで、前記大径側の山部の頂点から前記中間突出部までの間の前記外周側の斜面と、前記向かい合う小径側の山部の前記外周側の斜面との接触を規制する。   (Claim 1) A boot for a constant velocity joint according to the present invention includes a large-diameter mounting portion fixed to an end portion of a large-diameter member, a small-diameter mounting portion fixed to a shaft member having a smaller diameter than the large-diameter mounting portion, and A constant velocity joint boot comprising a bellows portion formed alternately and continuously between peaks and troughs between the large diameter mounting portion and the small diameter mounting portion, wherein the bellows portion has a joint angle A plurality of the crests are continuously formed so that an outer diameter centering on the central axis of the bellows portion at 0 ° decreases from the large diameter attachment portion side toward the small diameter attachment portion side, Among the plurality of peak portions, between the peak portion on the large diameter side and the peak portion on the small diameter side adjacent to the peak portion on the large diameter side, the apex of the peak portion on the large diameter side and the bottom of the valley portion Before the outer diameter of the annular surface centering on the central axis of the bellows part on the slope on the outer peripheral side connecting An intermediate projecting portion protrudes toward the small-diameter side ridge so as to have the same diameter as the outer diameter of the small-diameter side ridge, and the intermediate projecting portion is formed on the annular surface when the bellows portion is contracted. Is in contact with the outer peripheral slope of the small-diameter ridge facing each other, the outer peripheral slope between the apex of the large-diameter ridge and the intermediate protrusion, and the opposing small-diameter side The contact with the slope on the outer peripheral side of the mountain portion is regulated.

このように、蛇腹部が縮んだ場合においては、大径側の山部の外周側の斜面上に設けられた中間突出部の環状面と、環状面と同じ外径で形成され環状面との間で回転時における周速差が生じない小径側の山部の外周側の斜面とが接触する。このため、小径側の山部の外周側の斜面と、小径側の山部の頂点における周速より大きな周速で回転する、大径側の山部の頂点から中間突出部までの間の外周側の斜面との接触を規制することができる。これにより、大きな周速差を有する、向かい合う頂点側の斜面同士が接触し、両者が周方向に相対変位する（すべる）ことで発生させる大きな擦過音の発生を抑制できる。   Thus, when the bellows portion contracts, the annular surface of the intermediate projecting portion provided on the slope on the outer peripheral side of the large-diameter mountain portion and the annular surface formed with the same outer diameter as the annular surface The slope on the outer peripheral side of the ridge on the small diameter side that does not cause a difference in peripheral speed during rotation comes into contact. For this reason, the outer circumference between the top of the large-diameter ridge and the intermediate protrusion rotates at a peripheral speed greater than the peripheral speed at the ridge of the small-diameter ridge and the apex of the small-diameter ridge. The contact with the side slope can be regulated. Accordingly, it is possible to suppress the generation of a large rubbing sound that occurs when the opposing apex-side slopes having a large peripheral speed difference come into contact with each other and both are relatively displaced (slid) in the circumferential direction.

（請求項２）また、前記中間突出部は、前記山部の頂点側から前記谷部の谷底に向かって肉厚を減少させてもよい。これにより、向かい合う大径側の山部と小径側の山部との間では、谷底を基点として屈曲され、小径側の山部の外周側の斜面と、小径側の山部と向かい合う中間突出部の環状面とが面同士で良好に接触し、安定した接触状態を維持しやすい。このため、小径側の山部の外周側の斜面と、大径側の山部の頂点から中間突出部までの間の外周側の斜面とが接触することを良好に規制することができ、延いては擦過音の発生を防止できる。また、中間突出部のうち大径側の山部の頂点に近い部分、つまり中間突出部のうち外周面側の部分ほど中間突出部の肉厚が厚く形成される。これによっても、小径側の山部の外周側の斜面と、大径側の山部の頂点から中間突出部までの間の外周側の斜面と間の接触は良好に規制され、擦過音の発生が防止される。   (Claim 2) Further, the intermediate projecting portion may be reduced in thickness from the apex side of the peak portion toward the bottom of the valley portion. As a result, between the crest on the large-diameter side and the crest on the small-diameter side facing each other, it is bent with the valley bottom as a base point, the slope on the outer peripheral side of the crest on the small-diameter side, and the intermediate protrusion facing the crest on the small-diameter side It is easy to maintain a stable contact state because the two annular surfaces are in good contact with each other. For this reason, it is possible to satisfactorily regulate the contact between the slope on the outer periphery of the small-diameter ridge and the slope on the outer periphery between the apex of the large-diameter ridge and the intermediate protrusion. Therefore, the generation of scratching noise can be prevented. Further, the portion of the intermediate protrusion that is closer to the apex of the peak portion on the large diameter side, that is, the portion of the intermediate protrusion that is on the outer peripheral surface side, is formed thicker. This also regulates the contact between the slope on the outer peripheral side of the peak portion on the small diameter side and the slope on the outer peripheral side between the apex of the peak portion on the large diameter side to the intermediate protrusion, and generates scratching noise. Is prevented.

等速ジョイント組立体を所定の作動角度作動させたときの状態を説明する図である。It is a figure explaining the state when operating the constant velocity joint assembly by the predetermined operating angle. 初期状態におけるブーツの図である。It is a figure of the boots in an initial state. 図２のＢ部の拡大図である。It is an enlarged view of the B section of FIG. 図１のＡ部を説明する拡大図である。It is an enlarged view explaining the A section of FIG. 変形態様に係る図３に対応する図である。It is a figure corresponding to FIG. 3 which concerns on a deformation | transformation aspect.

（等速ジョイント組立体の構成）
本実施形態の等速ジョイント組立体１について、図１、図２を参照して説明する。図１は、等速ジョイント組立体１を最大ジョイント角θとした状態の軸方向断面図である。図２は、図１の等速ジョイント用ブーツ７０の初期状態における軸方向断面図を示している。ここで、初期状態とは、ジョイント角０°の状態である。なお、ジョイント角とは、図１に示す外輪軸線Ｃ１と内輪軸線Ｃ２の相対角度である。最大ジョイント角とは、外輪の開口端部とシャフトの外周面が接触して、それ以上の角度を付加できないジョイント角である。通常、等速ジョイント１０の作動においては、最大ジョイント角θを下回る角度で作動される。 (Constitution of constant velocity joint assembly)
The constant velocity joint assembly 1 of this embodiment is demonstrated with reference to FIG. 1, FIG. FIG. 1 is an axial sectional view of the constant velocity joint assembly 1 with the maximum joint angle θ. FIG. 2 shows an axial sectional view of the constant velocity joint boot 70 of FIG. 1 in an initial state. Here, the initial state is a state where the joint angle is 0 °. The joint angle is a relative angle between the outer ring axis C1 and the inner ring axis C2 shown in FIG. The maximum joint angle is a joint angle at which the opening end portion of the outer ring and the outer peripheral surface of the shaft are in contact with each other and a further angle cannot be added. Normally, the constant velocity joint 10 is operated at an angle below the maximum joint angle θ.

等速ジョイント組立体１は、例えば、車両の動力伝達シャフトに用いられる。この場合、等速ジョイント組立体１は、ディファレンシャル（図示せず）と車輪（図示せず）とを連結するドライブシャフトに好適に用いられる。   The constant velocity joint assembly 1 is used for a power transmission shaft of a vehicle, for example. In this case, the constant velocity joint assembly 1 is suitably used for a drive shaft that connects a differential (not shown) and a wheel (not shown).

等速ジョイント組立体１は、図１に示すように、等速ジョイント１０と、シャフト６０（本発明の軸部材に相当する）と、等速ジョイント用ブーツ７０（以下、ブーツと称する）と、大径ブーツバンド９５と、小径ブーツバンド９６とを備える。   As shown in FIG. 1, the constant velocity joint assembly 1 includes a constant velocity joint 10, a shaft 60 (corresponding to a shaft member of the present invention), a constant velocity joint boot 70 (hereinafter referred to as a boot), A large-diameter boot band 95 and a small-diameter boot band 96 are provided.

等速ジョイント１０は、図１においてはボール型等速ジョイントを例示するが、トリポード型等速ジョイントなどを適用することもできる。本実施形態の等速ジョイント１０は、ジョイント中心Ｏを屈曲の中心として固定し、軸方向変位を許容しない固定式ボール型等速ジョイント（「ツェッパ型等速ジョイント」とも称する）である。なお、図１に示すようにジョイント中心Ｏは、外輪軸線Ｃ１と内輪軸線Ｃ２との交点である。   The constant velocity joint 10 is exemplified by a ball type constant velocity joint in FIG. 1, but a tripod type constant velocity joint or the like can also be applied. The constant velocity joint 10 of the present embodiment is a fixed ball type constant velocity joint (also referred to as a “Zepper type constant velocity joint”) that fixes the joint center O as the center of bending and does not allow axial displacement. As shown in FIG. 1, the joint center O is an intersection of the outer ring axis C1 and the inner ring axis C2.

等速ジョイント１０は、外輪２０（本発明の大径部材に相当する）、内側部材としての内輪３０と、トルク伝達部材としての複数のボール４０と、保持器５０とを備えて構成されている。なお、トリポード型等速ジョイントを適用する場合には、内側部材がトリポードとなり、トルク伝達部材がローラとなる。   The constant velocity joint 10 includes an outer ring 20 (corresponding to a large-diameter member of the present invention), an inner ring 30 as an inner member, a plurality of balls 40 as torque transmission members, and a cage 50. . When a tripod type constant velocity joint is applied, the inner member is a tripod and the torque transmission member is a roller.

シャフト６０は、先端側（図１の右側）から順に、先端部６１と、後部６２とを有して構成される。先端部６１は、内輪３０の内周面とスプライン嵌合されている。後部６２は、図１に示すように、外輪２０に対してシャフト６０が最大ジョイント角θで傾斜した際に、後部６２の外周面と外輪２０の開口端部２５の面取部２５ａが接触する。また、後部６２の図１における左側端部には、ブーツ７０のシャフト側取付部７３を押し付けられて、ブーツ７０との間でシールされる環状溝６２ａが形成されている。   The shaft 60 includes a front end portion 61 and a rear portion 62 in order from the front end side (the right side in FIG. 1). The tip portion 61 is spline-fitted with the inner peripheral surface of the inner ring 30. As shown in FIG. 1, when the shaft 60 is inclined at the maximum joint angle θ with respect to the outer ring 20, the rear part 62 contacts the outer peripheral surface of the rear part 62 and the chamfered part 25 a of the open end 25 of the outer ring 20. . In addition, an annular groove 62 a is formed at the left end of the rear part 62 in FIG.

ブーツ７０は、上述した初期状態（ジョイント角０°）における全体形状としては、傾斜を有した筒状に形成され、外輪２０とシャフト６０との間を被覆する。ブーツ７０は、樹脂製であり、蛇腹部７１と、外輪側取付部７２（本発明の大径取付部に相当する）と、シャフト側取付部７３（本発明の小径取付部に相当する）とを有する。蛇腹部７１は、外輪側取付部７２とシャフト側取付部７３との間に設けられる。つまり、蛇腹部７１は、図２に示すように、各山部の外径が、外輪側取付部７２側からシャフト側取付部７３側に向かって徐々に縮径するように形成されている。   The boot 70 is formed in a cylindrical shape having an inclination as an overall shape in the initial state (joint angle 0 °) described above, and covers the space between the outer ring 20 and the shaft 60. The boot 70 is made of resin, and includes a bellows portion 71, an outer ring side mounting portion 72 (corresponding to the large diameter mounting portion of the present invention), and a shaft side mounting portion 73 (corresponding to the small diameter mounting portion of the present invention). Have The bellows portion 71 is provided between the outer ring side mounting portion 72 and the shaft side mounting portion 73. That is, as shown in FIG. 2, the bellows portion 71 is formed such that the outer diameter of each peak portion gradually decreases from the outer ring side attachment portion 72 side toward the shaft side attachment portion 73 side.

図２に示すように、蛇腹部７１は、本体部７７と、後に詳述する複数（本実施形態においては４つ）の中間突出部７４とを有している。図２に示すように、初期状態における本体部７７は、蛇腹部７１の中心軸線を中心とする山部の外径が、外輪側取付部７２側からシャフト側取付部７３側に向かって順次小さくなるよう山部と谷部とが、連続して交互に複数設けられている。   As shown in FIG. 2, the bellows portion 71 has a main body portion 77 and a plurality (four in this embodiment) of intermediate projecting portions 74 described in detail later. As shown in FIG. 2, the main body 77 in the initial state has an outer diameter of a mountain portion centered on the central axis of the bellows portion 71 that gradually decreases from the outer ring side mounting portion 72 side toward the shaft side mounting portion 73 side. A plurality of peaks and valleys are provided alternately in succession.

蛇腹部７１は、ブーツ７０の中心軸線方向に伸縮自在であるとともに、所定のジョイント角の変化に追従するように屈曲変形する。なお、ブーツ７０の中心軸線方向とは、上述した初期状態（ジョイント角０°）におけるブーツ７０の中心軸線方向をいい、内輪軸線Ｃ２に一致する。以降において、軸線方向とのみ説明した場合、初期状態におけるブーツ７０の中心軸線（＝内輪軸線Ｃ２）方向のことをいうものとする。   The bellows portion 71 can be expanded and contracted in the direction of the central axis of the boot 70 and bends and deforms so as to follow a change in a predetermined joint angle. The center axis direction of the boot 70 refers to the center axis direction of the boot 70 in the above-described initial state (joint angle 0 °) and coincides with the inner ring axis C2. Hereinafter, when only the axial direction is described, it means the central axis (= inner ring axis C2) direction of the boot 70 in the initial state.

ここでは、外輪２０の開口端部２５に近接する側から順に、６つの山部について符号７１ａ〜７１ｆを付し、各山部７１ａ〜７１ｆの間に位置する５つの谷部について符号７１ｇ〜７１ｋを付す。図１，図２において、この蛇腹部７１は、右側に外輪側取付部７２が設けられ、左側にシャフト側取付部７３が設けられている。   Here, in order from the side close to the opening end 25 of the outer ring 20, reference numerals 71a to 71f are assigned to the six peak parts, and reference numerals 71g to 71k are assigned to the five valley parts located between the peak parts 71a to 71f. Is attached. 1 and 2, the bellows portion 71 is provided with an outer ring side mounting portion 72 on the right side and a shaft side mounting portion 73 on the left side.

図１に示すように、外輪側取付部７２は、外輪２０の外周面端部に形成された環状溝２４に取り付けられ、外周面を大径ブーツバンド９５により径方向内方へ押し付けられることにより外輪２０の外周面との間でシールする。シャフト側取付部７３は、シャフト６０の後部６２の環状溝６２ａに取り付けられ、外周面を小径ブーツバンド９６により径方向内方へ押し付けられることによりシャフト６０の外周面との間でシールする。大径ブーツバンド９５および小径ブーツバンド９６は、例えばΩ形ブーツバンド、折返し式（ワンタッチ式）ブーツバンドなどが適用される。   As shown in FIG. 1, the outer ring side attachment portion 72 is attached to the annular groove 24 formed at the outer peripheral surface end of the outer ring 20, and the outer peripheral surface is pressed radially inward by the large-diameter boot band 95. Sealing with the outer peripheral surface of the outer ring 20 is performed. The shaft side attaching portion 73 is attached to the annular groove 62 a of the rear portion 62 of the shaft 60, and seals between the outer peripheral surface of the shaft 60 by pressing the outer peripheral surface radially inward by the small-diameter boot band 96. As the large-diameter boot band 95 and the small-diameter boot band 96, for example, an Ω-type boot band, a folded (one-touch) boot band, or the like is applied.

（等速ジョイント１０の作動時における蛇腹部７１の変形状態の説明）
ここで、後の説明の為に必要となる、等速ジョイント１０の作動時における蛇腹部７１の変形状態について説明しておく。なお、前述したように、等速ジョイント１０は、通常、図１に示す最大ジョイント角θを下回るジョイント角で屈曲された状態で回転作動するが、今回、便宜的に最大ジョイント角θの状態を示す図１を参照しながら変形状態について説明する。 (Description of the deformation state of the bellows portion 71 when the constant velocity joint 10 is operated)
Here, the deformation state of the bellows portion 71 when the constant velocity joint 10 is operated, which is necessary for the following description, will be described. As described above, the constant velocity joint 10 normally rotates in a state bent at a joint angle less than the maximum joint angle θ shown in FIG. 1, but this time, the state of the maximum joint angle θ is set for convenience. The deformation state will be described with reference to FIG.

この状態において蛇腹部７１は、図１の下方に示す縮み側の縮み部と、上方に示す伸長側の伸長部とを同時に有している。このような状態で外輪２０に接続される連結軸２１とシャフト６０とが回転されると、やがて縮み部は１８０度回転した伸長側位置で伸長部となり、伸長部は１８０度回転した縮み側位置で縮み部となる。このように蛇腹部７１では、等速ジョイント１０の回転に伴って縮み部と伸長部とが１８０度毎に繰り返し出現する作動を行なう。なお、伸長部と縮み部との中間の位相では、蛇腹部７１は初期状態と同様の状態となっている。   In this state, the bellows portion 71 simultaneously has a contraction portion on the contraction side shown in the lower part of FIG. 1 and an extension portion on the extension side shown in the upper part. When the connecting shaft 21 connected to the outer ring 20 and the shaft 60 are rotated in such a state, the contraction part eventually becomes an extension part at an extension side position rotated 180 degrees, and the extension part is a contraction side position rotated 180 degrees. It becomes a shrinking part. As described above, the bellows portion 71 performs an operation in which the contraction portion and the extension portion repeatedly appear every 180 degrees as the constant velocity joint 10 rotates. Note that the bellows portion 71 is in a state similar to the initial state in an intermediate phase between the extension portion and the contraction portion.

（中間突出部７４の詳細形状について）
図２に示すように、各中間突出部７４は、蛇腹部７１の本体部７７が有する複数の各山部７１ａ〜７１ｆのうち、大径側の各山部７１ａ〜７１ｄと、大径側の各山部７１ａ〜７１ｄと隣接する小径側の各山部７１ｂ〜７１ｅとの間において、後述する大径側の各山部７１ａ〜７１ｄの各斜面Ｇ上にそれぞれ設けられている。 (About the detailed shape of the intermediate protrusion 74)
As shown in FIG. 2, each of the intermediate protrusions 74 includes a plurality of peak portions 71 a to 71 f included in the main body 77 of the bellows portion 71, and the peak portions 71 a to 71 d on the large diameter side, Between each peak part 71a-71d and each small-diameter side peak part 71b-71e adjacent, it is each provided on each slope G of each large-diameter side peak part 71a-71d mentioned later.

なお、各山部は、隣接する山部同士の組み合わせによって、大径側の山部にもなるし、小径側の山部にもなり得る。例えば、山部７１ａと山部７１ｂとの組み合わせにおいては、山部７１ａが、大径側の山部となり、山部７１ｂが、小径側の山部となる。また、山部７１ｂと山部７１ｃとの組み合わせにおいては、山部７１ｂが、大径側の山部となり、山部７１ｃが、小径側の山部となる。   Each peak can be a large-diameter peak or a small-diameter peak depending on the combination of adjacent peaks. For example, in the combination of the peak portion 71a and the peak portion 71b, the peak portion 71a becomes a large-diameter side peak portion, and the peak portion 71b becomes a small-diameter side peak portion. Moreover, in the combination of the peak part 71b and the peak part 71c, the peak part 71b becomes a peak part on the large diameter side, and the peak part 71c becomes a peak part on the small diameter side.

詳細には、各中間突出部７４は、小径側の各山部７１ｂ〜７１ｅとそれぞれ向かい合う、大径側の各山部７１ａ〜７１ｄの外周側の各斜面Ｇ（図２，図３中、破線参照）上にそれぞれ突設されている。このとき、外周側の各斜面Ｇとは、各山部７１ａ〜７１ｄの各頂点Ｔ１〜Ｔ４と各谷部７１ｇ〜７１ｊの各谷底Ｂｏ１〜Ｂｏ４とを接続する斜面である。   More specifically, each intermediate protrusion 74 faces each slope G on the outer peripheral side of each of the large-diameter ridges 71a to 71d facing each of the small-diameter ridges 71b to 71e (broken lines in FIGS. 2 and 3). (See below). At this time, each slope G on the outer peripheral side is a slope connecting each vertex T1 to T4 of each peak 71a to 71d and each bottom Bo1 to Bo4 of each valley 71g to 71j.

なお、以後、上記の各山部７１ａ〜７１ｄの各頂点Ｔ１〜Ｔ４と各谷部７１ｇ〜７１ｊの各谷底Ｂｏ１〜Ｂｏ４とを接続する斜面Ｇを、「外周側の斜面Ｇ」とのみ称する場合がある。このとき、各中間突出部７４は、各中間突出部７４が設けられた各外周側の斜面Ｇとそれぞれ隣接し向かい合う小径側の各山部７１ｂ〜７１ｅの外周側の各斜面に向かってそれぞれ突設されている。なお、説明の便宜上、大径側の各山部７１ａ〜７１ｄの外周側の各斜面Ｇ上にそれぞれ設けられる各中間突出部７４には、それぞれ符号７４ａ〜７４ｄを付与する。各中間突出部７４ａ〜７４ｄは、ほぼ同じ形状を呈し、それぞれが設けられる蛇腹部７１の本体部７７と同一部材によって一体的に形成されている。   In addition, hereinafter, the slope G connecting the vertices T1 to T4 of the peak portions 71a to 71d and the valley bottoms Bo1 to Bo4 of the valley portions 71g to 71j will be referred to as “slope G on the outer peripheral side” only. There is. At this time, each intermediate protrusion 74 protrudes toward each outer peripheral slope of each of the small-diameter ridges 71b to 71e adjacent to and opposite to each outer peripheral slope G on which each intermediate protrusion 74 is provided. It is installed. For convenience of explanation, reference numerals 74a to 74d are respectively given to the intermediate protrusions 74 provided on the slopes G on the outer peripheral side of the ridges 71a to 71d on the large diameter side, respectively. Each of the intermediate projecting portions 74a to 74d has substantially the same shape, and is integrally formed by the same member as the main body portion 77 of the bellows portion 71 provided with each of the intermediate projecting portions 74a to 74d.

本実施形態においては、蛇腹部７１の本体部７７が有する各山部７１ａ〜７１ｆ、各谷部７１ｇ〜７１ｋ、および各山部７１ａ〜７１ｆと各谷部７１ｇ〜７１ｋとを接続する、外周側の各斜面Ｇを有する直線部の肉厚は、図３に示すように、全て均一な肉厚ｔ１によって形成されているが、不均一な肉厚でもよい。なお、前記直線部の肉厚は、外周側の各斜面Ｇから法線方向内側に向かう部分の厚みをいう。そして、中間突出部７４ａを代表として記載する図３に示すように、中間突出部７４ａ（７４）は、山部７１ａの頂点Ｔ１側から谷部７１ｇの谷底Ｂｏ１に向かって肉厚ｔ２が漸次減少するよう形成されている。ここで、肉厚ｔ２は、本体部７７の外周側の斜面Ｇからの厚みであり、本体部７７の肉厚ｔ１と平行な方向における厚みとする。   In this embodiment, the outer peripheral side which connects each peak part 71a-71f which each main body part 77 of the bellows part 71 has, each valley part 71g-71k, and each peak part 71a-71f, and each valley part 71g-71k. As shown in FIG. 3, the thickness of each straight line portion having the slopes G is formed with a uniform thickness t1, but may be a non-uniform thickness. In addition, the thickness of the said linear part means the thickness of the part which goes to the normal line direction inner side from each slope G on the outer peripheral side. And as shown in FIG. 3 which describes the intermediate protrusion 74a as a representative, the intermediate protrusion 74a (74) gradually decreases in thickness t2 from the apex T1 side of the peak 71a toward the valley bottom Bo1 of the valley 71g. It is formed to do. Here, the thickness t2 is a thickness from the inclined surface G on the outer peripheral side of the main body portion 77, and is a thickness in a direction parallel to the thickness t1 of the main body portion 77.

中間突出部７４ａ以外の各中間突出部７４ｂ〜７４ｄについては、中間突出部７４ａと同様の形状であるので説明を省略する。以降においても、図３に基づき、各中間突出部７４ａ〜７４ｄを代表して中間突出部７４ａのみについて説明する。   The intermediate projecting portions 74b to 74d other than the intermediate projecting portion 74a have the same shape as the intermediate projecting portion 74a, and thus the description thereof is omitted. Hereinafter, based on FIG. 3, only the intermediate protrusion 74 a will be described on behalf of the intermediate protrusions 74 a to 74 d.

中間突出部７４ａは、外周面７５ａと、環状面７６ａと、を備えている。図３に示すように、外周面７５ａは、山部７１ａの外周側の斜面Ｇから肉厚ｔ２だけ突出した点Ｐと外周側の斜面Ｇとが接続されて形成される面である。図３に示す点Ｐは、中心軸線を中心とした外径φＤ１で形成された図略の円（以後、便宜上、円ｐと称す）の一点を示している。よって、円ｐと外周側の斜面Ｇとが接続されて形成された外周面７５ａは、中心軸線周りに筒状に形成されている。このとき、外周面７５ａと斜面Ｇとの為す角度は任意に設定可能である。   The intermediate protrusion 74a includes an outer peripheral surface 75a and an annular surface 76a. As shown in FIG. 3, the outer circumferential surface 75a is a surface formed by connecting a point P projecting from the slope G on the outer circumference side of the peak portion 71a by a thickness t2 and the slope G on the outer circumference side. A point P shown in FIG. 3 indicates one point of an unillustrated circle (hereinafter referred to as a circle p for convenience) formed with an outer diameter φD1 centered on the central axis. Therefore, the outer peripheral surface 75a formed by connecting the circle p and the outer peripheral slope G is formed in a cylindrical shape around the central axis. At this time, the angle formed between the outer peripheral surface 75a and the inclined surface G can be arbitrarily set.

なお、上記において、円ｐの外径φＤ１は、初期状態における大径側の山部７１ａに隣接する小径側の山部７１ｂの外径φｄ１と同じになるよう設定される（φＤ１＝φｄ１）。外径φｄ１も中心軸線を中心とした外径寸法である。   In the above, the outer diameter φD1 of the circle p is set to be the same as the outer diameter φd1 of the small-diameter crest 71b adjacent to the large-diameter crest 71a in the initial state (φD1 = φd1). The outer diameter φd1 is also an outer diameter dimension around the central axis.

環状面７６ａは、点Ｐを含む円ｐと、大径側の山部７１ａの外周側の斜面Ｇと、が接続され中心軸線周りに円環状に形成されている。つまり、外径φＤ１である円ｐが環状面７６ａの外周を形成している。このとき、環状面７６ａは、円ｐから外周側の斜面Ｇの谷部７１ｇの谷底Ｂｏ１に向かって斜面Ｇに接近し、斜面Ｇと接続される。つまり、中間突出部７４ａは、円ｐ（点Ｐ）における肉厚ｔ２を最大肉厚とし、斜面Ｇの谷底Ｂｏ１に向かって肉厚ｔ２が漸次減少するよう形成されている。   The annular surface 76a is formed in an annular shape around the central axis line by connecting the circle p including the point P and the slope G on the outer peripheral side of the large-diameter mountain portion 71a. That is, the circle p having the outer diameter φD1 forms the outer periphery of the annular surface 76a. At this time, the annular surface 76a approaches the slope G toward the bottom Bo1 of the valley 71g of the slope G on the outer peripheral side from the circle p, and is connected to the slope G. That is, the intermediate protrusion 74a is formed such that the thickness t2 in the circle p (point P) is the maximum thickness, and the thickness t2 gradually decreases toward the valley bottom Bo1 of the slope G.

なお、これを、言い換えると、中間突出部７４ａの肉厚ｔ２と、大径側の山部７１ａの外周側の斜面Ｇの法線方向内側に向かう均一な肉厚ｔ１との合計肉厚（ｔ１＋ｔ２）が、環状面７６ａの外周（円ｐ）から、山部７１ａの外周側の斜面Ｇの谷部７１ｇの谷底Ｂｏ１に向かって漸次減少するよう形成されているとも言える。   In other words, in other words, the total thickness (t1 + t2) of the thickness t2 of the intermediate projecting portion 74a and the uniform thickness t1 toward the inner side in the normal direction of the slope G on the outer peripheral side of the large-diameter side peak portion 71a. ) Is formed so as to gradually decrease from the outer periphery (circle p) of the annular surface 76a toward the valley bottom Bo1 of the valley portion 71g of the slope G on the outer periphery side of the peak portion 71a.

上記において、円ｐ（点Ｐ）における肉厚ｔ２は、本体部７７が縮んだ場合の縮み部において、小径側の山部７１ｂの外周側の頂点Ｔ２側斜面と、大径側の山部７１ａの頂点Ｔ１側斜面Ｇｔ１（Ｇｔ）との接触を十分規制可能とする肉厚であればよい。これらは、実験等により求めればよい。   In the above description, the thickness t2 of the circle p (point P) is such that the apex T2 side slope on the outer peripheral side of the small-diameter peak 71b and the large-diameter peak 71a in the contraction when the main body 77 contracts. Any thickness may be used as long as the contact with the apex T1 side slope Gt1 (Gt) can be sufficiently regulated. These may be obtained by experiments or the like.

（蛇腹部７１の屈曲部内側の縮み部での状態について）
所定のジョイント角で屈曲された等速ジョイント組立体１の作動中における、等速ジョイント１０の屈曲部の内側の蛇腹部７１の縮み部では、蛇腹部７１が、図４の拡大図に示すように折りたたまれた状態となる。 (About the state in the contraction part inside the bending part of the bellows part 71)
In the contracted portion of the bellows portion 71 inside the bent portion of the constant velocity joint 10 during operation of the constant velocity joint assembly 1 bent at a predetermined joint angle, the bellows portion 71 is as shown in the enlarged view of FIG. It will be in the folded state.

このとき、中間突出部を有さない従来の蛇腹部であれば、隣接する各山部の各外周側の向かい合う斜面同士は、各山部および各山部間の谷部のいずれかの点を基点として折りたたまれ斜面同士が全面で接触する場合がある。この場合、隣り合う山部同士は、各頂点における外径が異なっているので、各頂点近傍では等速ジョイントの作動に伴って回転される際の周速が異なり大きな周速差が生じる。このため、隣接する各山部の頂点近傍同士が接触すると、周速差によって山部間にすべりが生じ擦過音が発生する虞がある。   At this time, if it is a conventional bellows portion having no intermediate projecting portion, the slopes facing each other on the outer peripheral side of each adjacent peak portion are either points of the peak portions or the valley portions between the peak portions. In some cases, the slopes that are folded as the base point contact each other over the entire surface. In this case, since the adjacent ridges have different outer diameters at the respective vertices, the peripheral speeds when rotating in accordance with the operation of the constant velocity joint are different in the vicinity of the respective vertices, resulting in a large peripheral speed difference. For this reason, when the apex vicinity of each adjacent peak part contacts, there exists a possibility that a slip may generate | occur | produce between peak parts by a peripheral speed difference, and a noise may generate | occur | produce.

これに対し、本実施形態にかかる蛇腹部７１では、例えば、中間突出部７４ａが、大径側の山部７１ａの頂点Ｔ１と谷部７１ｇの谷底Ｂｏ１とを接続する外周側の斜面Ｇ上に、突設されている。このような状態で、蛇腹部７１が縮んだ場合、蛇腹部７１の縮み部では、山部７１ａおよび山部７１ｂが、谷部７１ｇを基点として折りたたまれる。   On the other hand, in the bellows portion 71 according to the present embodiment, for example, the intermediate projecting portion 74a is on the slope G on the outer peripheral side connecting the vertex T1 of the peak portion 71a on the large diameter side and the valley bottom Bo1 of the valley portion 71g. , Has been projecting. In such a state, when the bellows portion 71 is contracted, at the contracted portion of the bellows portion 71, the peak portion 71a and the peak portion 71b are folded with the valley portion 71g as a base point.

そして、山部７１ａの外周側の斜面Ｇ上に突設された中間突出部７４ａの環状面７６ａが、小径側の山部７１ｂの外周側の斜面と当接する。このとき、小径側の山部７１ｂの外径φｄ１は、中間突出部７４ａの環状面７６ａの外径φＤ１と等しい（図３参照）。このため、接触した中間突出部７４ａの環状面７６ａと小径側の山部７１ｂの外周側の斜面との間に周速差は発生しない。また、このとき、周速の大きな山部７１ａの頂点Ｔ１から中間突出部７４ａの外周面７５ａまでの間における山部７１ａの外周側の斜面Ｇｔ（Ｇｔ１）は、中間突出部７４ａが設けられたことによって、小径側の山部７１ｂの外周側の斜面と接触することを規制されている。   And the annular surface 76a of the intermediate | middle protrusion part 74a protrudingly provided on the slope G of the outer peripheral side of the peak part 71a contact | abuts the slope of the outer peripheral side of the small diameter side peak part 71b. At this time, the outer diameter φd1 of the peak portion 71b on the small diameter side is equal to the outer diameter φD1 of the annular surface 76a of the intermediate protrusion 74a (see FIG. 3). For this reason, a circumferential speed difference does not occur between the annular surface 76a of the intermediate projecting portion 74a and the inclined surface on the outer peripheral side of the small-diameter mountain portion 71b. At this time, the intermediate protrusion 74a is provided on the slope Gt (Gt1) on the outer peripheral side of the peak 71a between the apex T1 of the peak 71a having a high peripheral speed and the outer peripheral surface 75a of the intermediate protrusion 74a. Thus, contact with the slope on the outer peripheral side of the small-diameter ridge 71b is restricted.

なお、上記実施形態においては、各中間突出部７４ａ〜７４ｄが、ブーツ７０（蛇腹部７１）と同じ材質で一体形成されたがこれには限らない。例えば、異なる各種樹脂材で蛇腹部７１と一体的に形成してもよい。また、各種ゴム材で蛇腹部７１と一体的に形成してもよい。   In the above-described embodiment, the intermediate projecting portions 74a to 74d are integrally formed of the same material as the boot 70 (the bellows portion 71), but the present invention is not limited thereto. For example, you may form integrally with the bellows part 71 with various different resin materials. Moreover, you may form integrally with the bellows part 71 with various rubber materials.

（効果）
上述の説明から明らかなように、本実施形態によれば、等速ジョイントの作動時において、蛇腹部７１が縮んだ場合、縮み部では、大径側の各山部７１ａ〜７１ｄの外周側の各斜面Ｇ上に設けられた各中間突出部７４ａ〜７４ｄと、大径側の山部７１ａ〜７１ｄと隣接し向かい合う小径側の山部７１ｂ〜７１ｅの外周側の斜面とがそれぞれ接触する。このとき、各中間突出部７４ａ〜７４ｄの環状面７６ａ〜７６ｄの外径φＤ（φＤ１〜φＤ４）と、隣接する小径側の山部７１ｂ〜７１ｅの外径φｄ（φｄ１〜φｄ４）とはそれぞれ同じ外径で形成されている。このため、各中間突出部７４ａ〜７４ｄの各環状面７６ａ〜７６ｄと小径側の各山部７１ｂ〜７１ｅの外周側の各斜面との間に周速差は発生しない。これにより、両者の間に周方向への相対変位（すべり）が生じず、擦過音が発生する虞もない。 (effect)
As is apparent from the above description, according to the present embodiment, when the bellows portion 71 contracts during the operation of the constant velocity joint, the contraction portion has an outer peripheral side of each of the large-diameter portions 71a to 71d. The intermediate protrusions 74a to 74d provided on the slopes G are in contact with the slopes on the outer peripheral sides of the small-diameter ridges 71b to 71e that are adjacent to and face the large-diameter ridges 71a to 71d. At this time, the outer diameters φD (φD1 to φD4) of the annular surfaces 76a to 76d of the intermediate projecting portions 74a to 74d are the same as the outer diameters φd (φd1 to φd4) of the adjacent ridges 71b to 71e on the small diameter side. It is formed with an outer diameter. For this reason, a peripheral speed difference does not occur between the annular surfaces 76a to 76d of the intermediate projecting portions 74a to 74d and the slopes on the outer peripheral side of the small-diameter ridges 71b to 71e. As a result, there is no relative displacement (slip) in the circumferential direction between the two, and there is no possibility of scratching.

また、各中間突出部７４ａ〜７４ｄを設けたので、小径側の山部７１ｂ〜７１ｅの外周側の斜面と、当該斜面より大きな周速で回転する大径側の山部７１ａ〜７１ｄの頂点Ｔ１〜Ｔ４から中間突出部７４ａ〜７４ｄの外周面７５ａ〜７５ｄまでの間の外周側の各斜面Ｇｔとの接触は良好に規制される。これにより、大きな周速差を有する、大径側の山部７１ａ〜７１ｄの外周側の各斜面Ｇｔと、小径側の山部７１ｂ〜７１ｅの頂点近傍の斜面とが接触し両者が周方向に相対変位する（すべる）ことで発生させる大きな擦過音の発生を抑制できる。   Further, since the intermediate projecting portions 74a to 74d are provided, the slopes on the outer peripheral side of the small-diameter side ridges 71b to 71e and the apex T1 of the large-diameter side ridges 71a to 71d rotating at a peripheral speed larger than the slope. The contact with the inclined surfaces Gt on the outer peripheral side between T4 and the outer peripheral surfaces 75a to 75d of the intermediate protrusions 74a to 74d is well regulated. Thereby, each slope Gt on the outer peripheral side of the large-diameter ridges 71a to 71d and a slope near the apex of the small-diameter ridges 71b to 71e are in contact with each other in the circumferential direction. It is possible to suppress the generation of a large rubbing sound that occurs due to relative displacement (sliding).

また、本実施形態によれば、各中間突出部７４ａ〜７４ｄは、各山部７１ａ〜７１ｄの各頂点Ｔ１〜Ｔ４側から各谷部７１ｇ〜７１ｊの各谷底Ｂｏ１〜Ｂｏ４に向かって肉厚ｔ２、または肉厚（ｔ１＋ｔ２）が漸次減少されている。これにより、隣接し向かい合う大径側の各山部７１ａ〜７１ｄと小径側の各山部７１ｂ〜７１ｅとの間では、各谷部７１ｇ〜７１ｊを基点として屈曲され、小径側の各山部７１ｂ〜７１ｅの外周側の斜面と、小径側の山部と向かい合う各中間突出部７４ａ〜７４ｄの環状面７６ａ〜７６ｄとが面同士で良好に接触し、安定した接触状態を維持しやすい。   Moreover, according to this embodiment, each intermediate | middle protrusion part 74a-74d is thickness t2 toward each trough bottom Bo1-Bo4 of each trough part 71g-71j from each vertex T1-T4 side of each peak part 71a-71d. Or the wall thickness (t1 + t2) is gradually decreased. As a result, between the adjacent ridges 71a to 71d on the large diameter side and the ridges 71b to 71e on the small diameter side, the ridges 71g to 71j are bent as base points, and the ridges 71b on the small diameter side are bent. The slopes on the outer peripheral side of ˜71e and the annular surfaces 76a to 76d of the intermediate projecting portions 74a to 74d facing the small-diameter side ridges are in good contact with each other, and it is easy to maintain a stable contact state.

このため、小径側の各山部７１ｂ〜７１ｅの外周側の斜面と、大径側の各山部７１ａ〜７１ｄの頂点Ｔ１〜Ｔ４から各中間突出部７４ａ〜７４ｄまでの間の外周側の各斜面Ｇｔとが接触することを良好に規制することができ、延いては擦過音の発生を防止できる。また、中間突出部７４ａ〜７４ｄのうち大径側の各山部７１ａ〜７１ｄの各頂点Ｔ１〜Ｔ４に近い部分、つまり各中間突出部７４ａ〜７４ｄのうち外周面７５ａ〜７５ｄ側の部分ほど中間突出部７４ａ〜７４ｄの肉厚ｔ２が厚く形成される。これによっても、小径側の各山部７１ｂ〜７１ｅの外周側の斜面と、大径側の各山部７１ａ〜７１ｄの各頂点Ｔ１〜Ｔ４から各中間突出部７４ａ〜７４ｄまでの間の外周側の各斜面Ｇｔとの間の接触は良好に規制され、擦過音の発生が防止される。   Therefore, the outer peripheral slopes of the small-diameter side ridges 71b to 71e and the outer peripheral sides between the apexes T1 to T4 of the large-diameter ridges 71a to 71d to the intermediate protrusions 74a to 74d. The contact with the slope Gt can be well controlled, and thus the generation of scratching noise can be prevented. Further, the intermediate protrusions 74a to 74d are closer to the vertices T1 to T4 of the large-diameter peak portions 71a to 71d, that is, the intermediate protrusions 74a to 74d are closer to the outer peripheral surfaces 75a to 75d. The protrusions 74a to 74d are formed with a large thickness t2. Even by this, the outer peripheral side between the slopes on the outer peripheral side of the small-diameter ridges 71b to 71e and the vertices T1 to T4 of the large-diameter ridges 71a to 71d to the intermediate protrusions 74a to 74d. The contact with each of the slopes Gt is well regulated, and the generation of scratching noise is prevented.

（実施形態の変形態様）
次に、変形態様について図５に基づき説明する。図５は、上記実施形態を説明する図３に対応する図である。変形態様のブーツ９７は、上記実施形態のブーツ７０に対して各中間突出部の形状のみが異なる。形状以外は、全て上記実施形態の各中間突出部７４ａ〜７４ｄと同様である。よって異なる部分についてのみ説明し、同様部分については、説明を省略する。 (Modification of Embodiment)
Next, a deformation | transformation aspect is demonstrated based on FIG. FIG. 5 is a diagram corresponding to FIG. 3 for explaining the embodiment. The deformed boot 97 differs from the boot 70 of the above embodiment only in the shape of each intermediate protrusion. Except for the shape, they are all the same as the intermediate protrusions 74a to 74d of the above embodiment. Therefore, only different parts will be described, and description of similar parts will be omitted.

上記実施形態のブーツ７０では、各中間突出部７４ａ〜７４ｄは、環状面７６ａ〜７６ｄの外周を形成する各円ｐから谷部７１ｇ〜７１ｊの谷底Ｂｏ１〜Ｂｏ４に向かって肉厚ｔ２が漸次減少するよう形成されている。しかし、この態様には限らず変形態様として、ブーツを図５に示すブーツ９７とし、中間突出部７４を中間突出部９４としてもよい。具体的には、中間突出部９４ａの環状面９６ａを、谷部７１ｇまで到達させず、点Ｐを含む円ｐから谷部７１ｇに向かって、少しの区間だけ設けるようにしてもよい。このとき、谷部７１ｇに向かって設ける長さは任意であり、これによっても相応の効果は得られる。なお、中間突出部９４ａは、代表として説明したものであり、他の各中間突出部９４も同様に設けられるものとする。   In the boot 70 of the above embodiment, the thickness t2 of each intermediate protrusion 74a to 74d gradually decreases from each circle p forming the outer periphery of the annular surfaces 76a to 76d toward the valley bottoms Bo1 to Bo4 of the valleys 71g to 71j. It is formed to do. However, the present invention is not limited to this mode, and as a modified mode, the boot may be the boot 97 shown in FIG. 5 and the intermediate protrusion 74 may be the intermediate protrusion 94. Specifically, the annular surface 96a of the intermediate projecting portion 94a may be provided only for a few sections from the circle p including the point P toward the valley portion 71g without reaching the valley portion 71g. At this time, the length provided toward the valley portion 71g is arbitrary, and a corresponding effect can be obtained also by this. The intermediate projecting portion 94a has been described as a representative, and the other intermediate projecting portions 94 are also provided in the same manner.

なお、上記実施形態および変形態様においては、発明に係るブーツ７０、９７を固定式のボール型等速ジョイントに適用するよう例示して説明した。しかし、これに限らず、ブーツ７０、９７は、摺動式のボール型等速ジョイントにも適用できる。また、各種トリポード型等速ジョイントにも適用できる。このような構成においても同様の効果を奏する。   In the above-described embodiments and modifications, the boots 70 and 97 according to the invention have been illustrated and described as being applied to a fixed ball-type constant velocity joint. However, the present invention is not limited to this, and the boots 70 and 97 can also be applied to a sliding ball type constant velocity joint. It can also be applied to various tripod type constant velocity joints. Even in such a configuration, the same effect can be obtained.

１：等速ジョイント組立体、 １０：等速ジョイント、 ２０：外輪、 ２５：開口端部、 ３０：内輪、 ４０：ボール、 ５０：保持器、 ６０：シャフト、 ７０，９７：等速ジョイント用ブーツ（ブーツ）、 ７１：蛇腹部、 ７１ａ〜７１ｆ：山部、 ７１ａ〜７１ｄ：大径側の山部、 ７１ｂ〜７１ｅ：小径側の山部、 ７１ｇ〜７１ｋ：谷部、 ７４，７４ａ〜７４ｄ，９４ａ：中間突出部、 ７５ａ〜７５ｄ，９５ａ：外周面、 ７６ａ〜７６ｄ，９６ａ：環状面、 Ｂｏ１〜Ｂｏ４：谷底、 Ｇｔ，Ｇｔ１：頂点側斜面、 Ｔ１〜Ｔ４：頂点。   1: constant velocity joint assembly, 10: constant velocity joint, 20: outer ring, 25: open end, 30: inner ring, 40: ball, 50: cage, 60: shaft, 70, 97: boot for constant velocity joint (Boots), 71: bellows part, 71a-71f: peak part, 71a-71d: peak part on large diameter side, 71b-71e: peak part on small diameter side, 71g-71k: valley part, 74, 74a-74d, 94a: intermediate projecting part, 75a to 75d, 95a: outer peripheral surface, 76a to 76d, 96a: annular surface, Bo1 to Bo4: valley bottom, Gt, Gt1: apex side slope, T1 to T4: apex.

Claims (2)

大径部材の端部に固定される大径取付部、前記大径取付部より小径の軸部材に固定される小径取付部、および前記大径取付部と前記小径取付部との間で山部と谷部とを交互に連続して形成された蛇腹部、を備える等速ジョイント用ブーツであって、
前記蛇腹部では、ジョイント角０°のときの前記蛇腹部の中心軸線を中心とする外径が前記大径取付部側から前記小径取付部側に向かって小さくなるよう、複数の前記山部が連続して形成され、
前記複数の山部のうち大径側の山部と、前記大径側の山部に隣接する小径側の山部との間において、前記大径側の山部の頂点と前記谷部の谷底とを接続する外周側の斜面上に、前記蛇腹部の前記中心軸線を中心とする環状面の外径が向かい合う前記小径側の山部の外径と同じ径になるように中間突出部が前記小径側の山部に向かって突設され、
前記中間突出部は、前記蛇腹部が縮んだ場合に、前記環状面が、向かい合う前記小径側の山部の外周側の斜面と接触することで、前記大径側の山部の頂点から前記中間突出部までの間の前記外周側の斜面と、前記向かい合う小径側の山部の前記外周側の斜面との接触を規制する等速ジョイント用ブーツ。 A large-diameter mounting portion fixed to an end of the large-diameter member, a small-diameter mounting portion fixed to a shaft member having a smaller diameter than the large-diameter mounting portion, and a mountain portion between the large-diameter mounting portion and the small-diameter mounting portion A constant velocity joint boot comprising a bellows portion formed by alternately and continuously forming a valley portion,
In the bellows portion, the plurality of peak portions are formed such that an outer diameter centering on a central axis of the bellows portion at a joint angle of 0 ° decreases from the large diameter attachment portion side toward the small diameter attachment portion side. Formed continuously,
Between the peak part of the large diameter side and the peak part of the small diameter side adjacent to the peak part of the large diameter side among the plurality of peak parts, the apex of the peak part of the large diameter side and the bottom of the valley part The intermediate protrusion is on the outer peripheral slope connecting the two and the intermediate projecting portion so that the outer diameter of the annular surface centering on the central axis of the bellows portion is the same as the outer diameter of the small-diameter side peak portion facing each other. Projected toward the small-diameter mountain,
When the bellows portion is contracted, the intermediate projecting portion comes into contact with the inclined surface on the outer peripheral side of the small-diameter side ridge facing each other, so that the intermediate projecting portion from the apex of the large-diameter side ridge A boot for a constant velocity joint that regulates contact between the inclined surface on the outer peripheral side up to the protruding portion and the inclined surface on the outer peripheral side of the crest portion on the small diameter side facing each other. 前記中間突出部は、前記山部の頂点側から前記谷部の谷底に向かって肉厚が減少していく、請求項１に記載の等速ジョイント用ブーツ。   2. The constant velocity joint boot according to claim 1, wherein the thickness of the intermediate projecting portion decreases from the apex side of the peak portion toward the bottom of the valley portion.

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