JP5777918B2 - Joint boots - Google Patents

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JP5777918B2
JP5777918B2 JP2011075950A JP2011075950A JP5777918B2 JP 5777918 B2 JP5777918 B2 JP 5777918B2 JP 2011075950 A JP2011075950 A JP 2011075950A JP 2011075950 A JP2011075950 A JP 2011075950A JP 5777918 B2 JP5777918 B2 JP 5777918B2
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bellows
diameter side
joint boot
overhanging
inclined surface
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JP2012207768A (en
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大下 武範
武範 大下
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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本発明は、自動車のトリポートタイプの等速ジョイントなどに用いられる蛇腹状のジョイントブーツに関するものである。   The present invention relates to a bellows-shaped joint boot used for an automobile triport type constant velocity joint or the like.

車両のドライブシャフト等に用いられる等速ジョイントの一つとして、トリポートタイ
プのジョイントが知られている。
A triport type joint is known as one of constant velocity joints used for vehicle drive shafts and the like.

トリポートタイプの等速ジョイントは、例として、図5,6に示すように、入力側と出力側の一方のシャフト1に、ローラ2を持つ3本のトラニオン3を軸直角方向に突設して構成したトリポート4と、他方のシャフト5の端部に設けたアウターケース6とからなる。アウターケース6は、その内周にトリポート4に対応する軸方向の3本の摺動溝6aを有する。等速ジョイントは、トリポート4のローラ2を摺動溝6aに対して軸方向に摺動可能に嵌め合わせることにより、両シャフト1,5の角度付けを可能にしながら、回転トルクを伝達できるように構成されている。   For example, as shown in FIGS. 5 and 6, the triport type constant velocity joint has three trunnions 3 having rollers 2 protruding in a direction perpendicular to the axis on one shaft 1 on the input side and the output side. And the outer case 6 provided at the end of the other shaft 5. The outer case 6 has three sliding grooves 6 a in the axial direction corresponding to the tripart 4 on the inner periphery thereof. The constant velocity joint is capable of transmitting rotational torque while allowing the shafts 1 and 5 to be angled by fitting the roller 2 of the triport 4 with the sliding groove 6a so as to be slidable in the axial direction. It is configured.

このような等速ジョイントにおいては、ジョイント内部への塵埃や異物の侵入防止のため、あるいはまた封入されているグリースを保持するために、一般に、アウターケース6からトリポート4側のシャフト1の部分を覆うように適度に伸縮や曲げ変形が可能な蛇腹状をなすジョイントブーツ100が装着されている。ジョイントブーツ100は、軸方向の一端部がアウターケース6の外周に嵌着されてリング状バンド等の締付部材7により固定される大径側取付部101として形成され、他端部がトリポート4側のシャフト1の外周にリング状バンド等の締付部材8により固定される小径側取付部102として形成され、大径側取付部101及び小径側筒部102が蛇腹部103により一体に連結されて構成されている。蛇腹部103は、大径側取付部101側から順に、第1谷部105A、第1山部106Aを含む複数(例えば3つ)の谷部と山部とが交互に連続してなる形状に形成されている。   In such a constant velocity joint, in order to prevent dust and foreign matter from entering the joint, or to keep the sealed grease, generally, the portion of the shaft 1 on the side of the triport 4 from the outer case 6 is used. A joint boot 100 having a bellows shape that can be appropriately expanded and contracted and bent so as to cover is mounted. The joint boot 100 is formed as a large-diameter side attachment portion 101 having one end portion in the axial direction fitted on the outer periphery of the outer case 6 and fixed by a fastening member 7 such as a ring-shaped band, and the other end portion is the tripart 4. Is formed as a small-diameter side mounting portion 102 fixed to the outer periphery of the side shaft 1 by a fastening member 8 such as a ring-shaped band, and the large-diameter side mounting portion 101 and the small-diameter side cylindrical portion 102 are integrally connected by a bellows portion 103. Configured. The bellows portion 103 has a shape in which a plurality of (for example, three) trough portions and crest portions including the first trough portion 105A and the first crest portion 106A are alternately arranged in order from the large-diameter side attachment portion 101 side. Is formed.

図6に示すように、アウターケース6は、内周の摺動溝6aの配置に対応して、外周には周方向に3つの均等配置された凹状部6bを備え、従って、アウターケース6の外周形状は周方向に凹凸形状をなす非円形状に形成されている。そのため、アウターケース6に取り付けられるジョイントブーツ100の大径側取付部101は、その内周形状がアウターケース6の外周形状に対応した非円形状をなしている。すなわち、大径側取付部101の内周には、アウターケース6の凹状部6bに対応して周方向の3箇所において内方に凸状に張り出した張出部104が形成されている(例えば、下記特許文献1参照)。   As shown in FIG. 6, the outer case 6 is provided with three evenly arranged concave portions 6 b in the circumferential direction on the outer periphery corresponding to the arrangement of the inner peripheral sliding grooves 6 a. The outer peripheral shape is formed in a non-circular shape having an uneven shape in the circumferential direction. Therefore, the large-diameter side attachment portion 101 of the joint boot 100 attached to the outer case 6 has a noncircular shape whose inner peripheral shape corresponds to the outer peripheral shape of the outer case 6. In other words, on the inner periphery of the large-diameter side mounting portion 101, there are formed protruding portions 104 that protrude inwardly at three locations in the circumferential direction corresponding to the concave portions 6b of the outer case 6 (for example, , See Patent Document 1 below).

特開2006−118698号公報JP 2006-118698 A

上記のように大径側取付部101の内周から張出部104が張り出している場合、蛇腹部103の屈曲変形時に最も蛇腹部103側に位置する第1谷部105Aが伸縮あるいは曲げ変形するために、大径側取付部101に設けた張出部104と蛇腹部103との連結部分に図7に示すような径方向外方へ陥没する溝部107が形成されている。この溝部107は、蛇腹部103へ向かうほど径方向内方に立ち上がる蛇腹側傾斜面107aと、張出部104へ向かうほど径方向内方に立ち上がる張出側傾斜面107bとで挟まれた略V字状をなしているため、次のような問題があることが判明した。   As described above, when the overhanging portion 104 protrudes from the inner periphery of the large-diameter side attachment portion 101, the first valley portion 105A located closest to the bellows portion 103 is expanded or contracted or bent when the bellows portion 103 is bent. For this purpose, a groove portion 107 is formed in the connecting portion between the overhanging portion 104 and the bellows portion 103 provided in the large-diameter side attachment portion 101 and is recessed outward in the radial direction as shown in FIG. The groove 107 is substantially V sandwiched between a bellows-side inclined surface 107a that rises inward in the radial direction toward the bellows portion 103 and a protruding-side inclined surface 107b that rises inward in the radial direction toward the overhanging portion 104. Since it was shaped like a letter, the following problems were found.

すなわち、上記形状のジョイントブーツ100では、溝部107がアンダーカット形状となるため、金型を大径側取付部101から抜き取る脱型時に溝部107の底部107cを起点として大径側取付部101を径方向外方に折り曲げながら脱型する。また、アウターケース6からトリポート4側のシャフト1の部分を覆うように装着されたジョイントブーツ100の使用時には、蛇腹部103の屈曲変形に伴って大径側取付部101と蛇腹部103との連結部分に設けられた溝部107の底部107cを起点として大きく折れ曲がることとなる。つまり、溝部107の底部107cには、ジョイントブーツ100の脱型時だけでなくジョイントブーツ100の使用時にも曲げ応力が作用することとなり、ジョイントブーツ100の耐久性が損なわれやすいことが判明した。   That is, in the joint boot 100 having the above shape, since the groove portion 107 has an undercut shape, the large-diameter side mounting portion 101 starts from the bottom portion 107c of the groove portion 107 when the mold is removed from the large-diameter side mounting portion 101. Demold while bending outward. Further, when the joint boot 100 mounted so as to cover the portion of the shaft 1 on the side of the triport 4 from the outer case 6 is used, the connection between the large-diameter side mounting portion 101 and the bellows portion 103 is accompanied by the bending deformation of the bellows portion 103. The bent portion 107 is bent greatly starting from the bottom 107c of the groove 107 provided in the portion. That is, it has been found that bending stress acts on the bottom 107c of the groove 107 not only when the joint boot 100 is removed but also when the joint boot 100 is used, and the durability of the joint boot 100 is likely to be impaired.

本発明は上記の点に鑑みてなされたものであり、大径側取付部と蛇腹部との連結部分に設けられた溝部において、金型から脱型する際に曲げ応力が作用する位置と、ジョイントブーツの使用時に曲げ応力が作用する位置を異ならせ、耐久性に優れるジョイントブーツを提供することを目的とする。   The present invention has been made in view of the above points, and in the groove portion provided in the connecting portion between the large-diameter side attachment portion and the bellows portion, a position where bending stress acts when demolding from the mold, and An object of the present invention is to provide a joint boot having excellent durability by changing the position where bending stress acts when using the joint boot.

本発明に係るジョイントブーツは、シャフトに取り付けられる小径側取付部と、アウターケースに取り付けられ前記小径側取付部より大径筒状の大径側取付部と、前記小径側取付部と前記大径側取付部とを連結する蛇腹部とを備え、前記大径側取付部の内周には、径方向内方に張り出した張出部が周方向に複数箇所設けられたジョイントブーツにおいて、前記張出部と前記蛇腹部とを連結する連結部の内面には、前記張出部より径方向外方に陥没する溝部が形成され、前記溝部は、その底部に設けられたジョイントブーツの軸方向に延びる平坦面と、前記平坦面の蛇腹部側端部から前記蛇腹部へ向かうほど径方向内方に立ち上がる蛇腹側傾斜面と、前記平坦面の張出部側端部から前記張出部へ向かうほど径方向内方に立ち上がる張出側傾斜面とを備え、前記連結部は、前記平坦面における肉厚が、前記蛇腹部の肉厚よりも厚いことを特徴とする。 The joint boot according to the present invention includes a small-diameter side attaching portion attached to a shaft, a large-diameter side attaching portion attached to an outer case and having a larger diameter than the small-diameter side attaching portion, the small-diameter side attaching portion, and the large-diameter A joint boot provided with a plurality of bellows portions extending inward in the radial direction on an inner periphery of the large-diameter side attachment portion. On the inner surface of the connecting portion that connects the protruding portion and the bellows portion, a groove portion that is recessed radially outward from the protruding portion is formed, and the groove portion is formed in the axial direction of the joint boot provided on the bottom portion thereof. A flat surface extending, a bellows-side inclined surface rising radially inward from the bellows-side end portion of the flat surface toward the bellows portion, and a heading from the overhanging portion-side end portion of the flat surface toward the overhanging portion Overhang side inclined surface that rises inward in the radial direction Wherein the coupling portion, the thickness of the flat surface, and wherein the thicker than the wall thickness of the bellows part.

本発明に係るジョイントブーツでは、大径側取付部に設けられた張出部と蛇腹部とを連結する連結部の内面に、ジョイントブーツの軸方向に延びる平坦面と、平坦面の蛇腹部側端部から蛇腹部へ向かうほど径方向内方に立ち上がる蛇腹側傾斜面と、平坦面の張出部側端部から張出部へ向かうほど径方向内方に立ち上がる張出側傾斜面とが設けられているため、脱型時には張出側傾斜面と平坦面との境界部分に、使用時には蛇腹側傾斜面と平坦面との境界部分に、それぞれ曲げ応力が異なる位置に作用することとなり、耐久性に優れる。   In the joint boot according to the present invention, a flat surface extending in the axial direction of the joint boot, and a bellows portion side of the flat surface on the inner surface of the connecting portion connecting the projecting portion and the bellows portion provided in the large-diameter side attachment portion A bellows-side inclined surface that rises inward in the radial direction as it goes from the end to the bellows portion, and a protruding-side inclined surface that rises inward in the radial direction from the end portion of the flat surface to the overhanging portion are provided As a result, bending stress acts on the boundary between the overhanging inclined surface and the flat surface during demolding, and on the boundary between the bellows inclined surface and the flat surface during use, at different positions. Excellent in properties.

また、本発明に係るジョイントブーツにおいて、前記張出側傾斜面が、径方向に対する傾斜角度が30°以上60°以下に設けられてもよく、これにより、金型をジョイントブーツから引き抜く方向に対して張出側傾斜面の傾きを緩やかに設けることができ、脱型しやすくなる。   Further, in the joint boot according to the present invention, the overhanging inclined surface may be provided with an inclination angle with respect to the radial direction of 30 ° or more and 60 ° or less, whereby the mold is pulled out from the joint boot. Thus, the slope of the overhanging inclined surface can be gently provided, and the mold can be easily removed.

また、本発明に係るジョイントブーツにおいて、前記大径側取付部は、前記張出部以外の肉厚xに対する前記張出部の肉厚yの比y/xが1.9以上3.2以下に設けられてもよい。   Further, in the joint boot according to the present invention, the large-diameter side attachment portion has a ratio y / x of the thickness y of the overhanging portion to the wall thickness x other than the overhanging portion of 1.9 or more and 3.2 or less. May be provided.

本発明では、大径側取付部と前記蛇腹部とを連結する連結部の内周が径方向外方に陥没するジョイントブーツの耐久性を向上させることができる。   In the present invention, it is possible to improve the durability of the joint boot in which the inner periphery of the connecting portion that connects the large-diameter side attaching portion and the bellows portion is depressed radially outward.

本発明の一実施形態に係るジョイントブーツの断面図である。It is sectional drawing of the joint boot which concerns on one Embodiment of this invention. 図1に示すジョイントブーツを大径側取付部側から見た正面図である。It is the front view which looked at the joint boot shown in FIG. 1 from the large diameter side attaching part side. 図1の要部拡大図である。It is a principal part enlarged view of FIG. 図1に示すジョイントブーツの斜視図である。It is a perspective view of the joint boot shown in FIG. 従来のジョイントブーツを取り付けたトリポートタイプの等速ジョイントを示す断面図である。It is sectional drawing which shows the triport type constant velocity joint which attached the conventional joint boot. 図5に示す等速ジョイントの側面図である。It is a side view of the constant velocity joint shown in FIG. 図5の要部拡大図である。It is a principal part enlarged view of FIG.

以下、本発明の一実施形態について、図面を参照して説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

本発明の一実施形態に係るジョイントブーツ10は、上記した図5,6に示す自動車用のトリポートタイプの等速ジョイントに装着されるジョイントブーツであり、一端側の小径側取付部12と、この小径側取付部12と離間して同軸的に配置された他端側の大径側取付部14と、小径側取付部12と大径側取付部14とを一体に連結する中空状の蛇腹部16とを備えており、インジェクション成形などの公知の成形方法により一体に形成されている。   A joint boot 10 according to an embodiment of the present invention is a joint boot that is attached to the above-described automobile triport type constant velocity joint shown in FIGS. 5 and 6, and includes a small-diameter side mounting portion 12 on one end side, A hollow bellows integrally connecting the small-diameter side mounting portion 12 and the large-diameter side mounting portion 14, and the large-diameter side mounting portion 14 on the other end side disposed coaxially with the small-diameter side mounting portion 12. And is integrally formed by a known molding method such as injection molding.

小径側取付部12は、トリポート4側のシャフト1に外嵌固定される短円筒状をなしており、外周面にリング状の締付部材8を受け入れるための周方向に延びる固定用凹部18が設けられている。小径側取付部12の内周には全周にわたって環状のシール突起13が設けられており、シール突起13において小径側取付部12とシャフト1との面圧を高めてシール性を高めている。   The small-diameter side mounting portion 12 has a short cylindrical shape that is fitted and fixed to the shaft 1 on the triport 4 side, and a fixing concave portion 18 that extends in the circumferential direction for receiving the ring-shaped fastening member 8 on the outer peripheral surface. Is provided. An annular seal protrusion 13 is provided on the entire inner periphery of the small diameter side mounting portion 12, and the seal protrusion 13 increases the surface pressure between the small diameter side mounting portion 12 and the shaft 1 to improve the sealing performance.

大径側取付部14は、アウターケース6に外嵌固定される短円筒状をなしており、小径側取付部12と同軸的に、即ち共通の中心軸Oを持つように配置されている。大径側取付部14にも、外周面にはリング状の締付部材7を受け入れるための周方向に延びる固定用凹部20が設けられている。また、大径側取付部14の内周には全周にわたって環状のシール突起15が設けられており、シール突起15において大径側取付部14とアウターケース6との面圧を高めてシール性を高めている。   The large-diameter side attachment portion 14 has a short cylindrical shape that is fitted and fixed to the outer case 6, and is arranged coaxially with the small-diameter side attachment portion 12, that is, has a common central axis O. The large-diameter mounting portion 14 is also provided with a fixing recess 20 extending in the circumferential direction for receiving the ring-shaped fastening member 7 on the outer peripheral surface. An annular seal protrusion 15 is provided on the inner periphery of the large-diameter side mounting portion 14 over the entire circumference. Is increasing.

蛇腹部16は、両端に口径差のある断面円形の蛇腹体であり、その内部にグリース封入空間を形成する。蛇腹部16は、大径側取付部14側から順に、第1谷部21A、第1山部23Aを含む複数(例えば3つ)の谷部21A,21B,21Cと複数(例えば3つ)山部23A,23B,23Cとが交互に連なり、大径側取付部14から小径側取付部12へと順次に小径となるテーパ状に形成されている。   The bellows portion 16 is a bellows body having a circular cross section with a difference in diameter at both ends, and forms a grease filled space therein. The bellows portion 16 includes a plurality of (for example, three) valley portions 21A, 21B, and 21C and a plurality of (for example, three) peaks including the first valley portion 21A and the first peak portion 23A in order from the large-diameter side attachment portion 14 side. The portions 23A, 23B, and 23C are alternately connected to each other, and are formed in a tapered shape having a small diameter sequentially from the large diameter side mounting portion 14 to the small diameter side mounting portion 12.

図2に示すように、大径側取付部14は、外周形状が円形状をなしており、内周形状が周方向の複数箇所(例えば3箇所)において内方に湾曲面状に張り出した非円形状をなしている。これにより、大径側取付部14には、アウターケース6の円弧状の外周面に対向配置される円弧状部22と、アウターケース6の凹状部6bに嵌合される張出部24とが周方向に交互に設けられている。本実施形態では、円弧状部22の肉厚xに対する張出部24の肉厚(つまり、最も内方に突出する位置における張出部24の肉厚)yの比y/xが1.9〜3.2の範囲内に設定されている。   As shown in FIG. 2, the large-diameter side mounting portion 14 has a circular outer peripheral shape, and the inner peripheral shape is a non-circular surface projecting inward at a plurality of circumferential positions (for example, three locations). It has a circular shape. As a result, the large-diameter side attachment portion 14 has an arc-shaped portion 22 disposed opposite to the arc-shaped outer peripheral surface of the outer case 6 and an overhang portion 24 fitted to the concave portion 6b of the outer case 6. They are provided alternately in the circumferential direction. In this embodiment, the ratio y / x of the wall thickness x of the arcuate portion 22 to the wall thickness of the overhang portion 24 (that is, the wall thickness of the overhang portion 24 at the most inward projecting position) y is 1.9. It is set within the range of ~ 3.2.

そして、大径側取付部14に設けられた張出部24と蛇腹部16とを連結する連結部26の内側には、径方向外方へ陥没する溝部28が形成されている。溝部28の底部は中心軸O方向に沿って延びる平坦面28cをなしており、平坦面28cの蛇腹部側端部から蛇腹部16へ向かうほど径方向内方に立ち上がる蛇腹側傾斜面28aが設けられ、また、平坦面28cの張出部側端部から張出部24へ向かうほど径方向内方に立ち上がる張出側傾斜面28bが設けられている。これにより、連結部26の内側には、蛇腹側傾斜面28aと平坦面28cと張出側傾斜面28bからなる溝部28が連結部26の内側に設けられている。   A groove portion 28 that is recessed outward in the radial direction is formed inside the connecting portion 26 that connects the overhang portion 24 and the bellows portion 16 provided on the large-diameter side attachment portion 14. The bottom of the groove portion 28 forms a flat surface 28c extending along the direction of the central axis O, and a bellows-side inclined surface 28a that rises inward in the radial direction from the bellows-side end of the flat surface 28c toward the bellows portion 16 is provided. In addition, an overhanging inclined surface 28b that rises inward in the radial direction from the overhanging portion side end of the flat surface 28c toward the overhanging portion 24 is provided. As a result, a groove portion 28 including a bellows-side inclined surface 28 a, a flat surface 28 c, and an overhang-side inclined surface 28 b is provided inside the connecting portion 26.

ここで、張出側傾斜面28bは、径方向rに対する傾斜角度θが30°〜60°の範囲であることが好ましい。張出側傾斜面28bの傾斜角度θが30°より小さくなると、金型をジョイントブーツ10から引き抜く方向に対する張出側傾斜面28bの傾きが大きくなり脱型しにくく成形性が損なわれ、傾斜角度θが60°より大きくなると、大径側取付部14の中心軸O方向の長さLが短くなりアウターケース6との間のシール性が損なわれる。   Here, the overhanging inclined surface 28b preferably has an inclination angle θ with respect to the radial direction r in a range of 30 ° to 60 °. When the inclination angle θ of the overhanging inclined surface 28b is smaller than 30 °, the inclination of the overhanging inclined surface 28b with respect to the direction in which the mold is pulled out from the joint boot 10 is increased, and it is difficult to remove the mold and the moldability is impaired. When θ is greater than 60 °, the length L in the direction of the central axis O of the large-diameter side attachment portion 14 is shortened, and the sealing performance with the outer case 6 is impaired.

以上のような構成を備えた本実施形態のジョイントブーツ10では、大径側取付部14に設けられた張出部24と蛇腹部16とを連結する連結部26の内側に径方向外方へ陥没する溝部28を設けたので、蛇腹部16の屈曲変形時に谷部21B,21C及び山部23A,23B,23Cだけでなく、最も大径側取付部14側に設けられた第1谷部21Aも伸縮あるいは曲げ変形することとなり、屈曲しやすさを確保することができる。   In the joint boot 10 of the present embodiment having the above-described configuration, radially outward to the inside of the connecting portion 26 that connects the overhanging portion 24 and the bellows portion 16 provided in the large-diameter side attachment portion 14. Since the recessed groove portion 28 is provided, not only the valley portions 21B and 21C and the mountain portions 23A, 23B and 23C but also the first valley portion 21A provided on the largest diameter side attachment portion 14 side when the bellows portion 16 is bent and deformed. Also, it will be expanded and contracted or bent, and it is possible to ensure the ease of bending.

また、連結部26に設けられた溝部28の底部が、中心軸O方向に沿って延びる平坦面28cをなしており、蛇腹部16に繋がる蛇腹側傾斜面28aと張出部24に繋がる張出側傾斜面28bとが平坦面28cの異なる位置で連結されているため、大径側取付部14を径方向外方に折り曲げながら金型を溝部28より脱型するジョイントブーツ10を脱型時と、蛇腹部16が屈曲変形するジョイントブーツ10の使用時とで、それぞれ異なる位置に曲げ応力が作用することとなり、ジョイントブーツ10の耐久性を向上させることができる。   Further, the bottom portion of the groove portion 28 provided in the connecting portion 26 forms a flat surface 28c extending along the central axis O direction, and the bellows-side inclined surface 28a connected to the bellows portion 16 and the overhanging portion connected to the overhanging portion 24. Since the side inclined surface 28b is connected to the flat surface 28c at a different position, the joint boot 10 for releasing the mold from the groove portion 28 while bending the large-diameter side mounting portion 14 radially outward is taken out of the mold. When the joint boot 10 in which the bellows portion 16 is bent and deformed, bending stress acts at different positions, and the durability of the joint boot 10 can be improved.

10…ジョイントブーツ
12…小径側取付部
13…シール突起
14…大径側取付部
15…シール突起
16…蛇腹部
18…固定用凹部
20…固定用凹部
21A…第1谷部
22…円弧状部
23A…第1山部
24…張出部
26…連結部
28…溝部
28a…蛇腹側傾斜面
28b…張出側傾斜面
28c…平坦面
O…中心軸
DESCRIPTION OF SYMBOLS 10 ... Joint boot 12 ... Small diameter side attaching part 13 ... Sealing protrusion 14 ... Large diameter side attaching part 15 ... Sealing protrusion 16 ... Bellows part 18 ... Fixing recessed part 20 ... Fixing recessed part 21A ... 1st trough part 22 ... Arc-shaped part 23A ... 1st peak part 24 ... Overhang part 26 ... Connection part 28 ... Groove part 28a ... Bellows side inclined surface 28b ... Overhang side inclined surface 28c ... Flat surface O ... Center axis

Claims (3)

シャフトに取り付けられる小径側取付部と、アウターケースに取り付けられ前記小径側取付部より大径筒状の大径側取付部と、前記小径側取付部と前記大径側取付部とを連結する蛇腹部とを備え、前記大径側取付部の内周には、径方向内方に張り出した張出部が周方向に複数箇所設けられたジョイントブーツにおいて、
前記張出部と前記蛇腹部とを連結する連結部の内面は、前記張出部より径方向外方に陥没する溝部が形成され、
前記溝部は、その底部に設けられたジョイントブーツの軸方向に延びる平坦面と、前記平坦面の蛇腹部側端部から前記蛇腹部へ向かうほど径方向内方に立ち上がる蛇腹側傾斜面と、前記平坦面の張出部側端部から前記張出部へ向かうほど径方向内方に立ち上がる張出側傾斜面とを備え
前記連結部は、前記平坦面における肉厚が、前記蛇腹部の肉厚よりも厚いことを特徴とするジョイントブーツ。
A small-diameter side attachment portion attached to the shaft, a large-diameter side attachment portion attached to the outer case and having a larger diameter than the small-diameter side attachment portion, and a bellows connecting the small-diameter side attachment portion and the large-diameter side attachment portion. In the joint boot provided with a plurality of projecting portions projecting radially inward in the inner periphery of the large-diameter side mounting portion,
On the inner surface of the connecting portion that connects the overhang portion and the bellows portion, a groove portion that is recessed outward in the radial direction from the overhang portion is formed,
The groove portion has a flat surface extending in the axial direction of the joint boot provided at the bottom thereof, a bellows-side inclined surface that rises inward in the radial direction from the bellows portion side end portion of the flat surface toward the bellows portion, and A projecting side inclined surface that rises inward in the radial direction as it goes from the projecting part side end of the flat surface to the projecting part ,
The joint boot is characterized in that a thickness on the flat surface is thicker than a thickness of the bellows portion .
前記張出側傾斜面が、径方向に対する傾斜角度が30°以上60°以下に設けられていることを特徴とする請求項1に記載のジョイントブーツ。   The joint boot according to claim 1, wherein the overhanging inclined surface is provided with an inclination angle with respect to a radial direction of 30 ° or more and 60 ° or less. 前記大径側取付部は、前記張出部以外の肉厚xに対する前記張出部の肉厚yの比y/xが1.9以上3.2以下に設けられていることを特徴とする請求項1又は2に記載のジョイントブーツ。   The large-diameter side attachment portion is provided such that a ratio y / x of a thickness y of the overhanging portion to a thickness x other than the overhanging portion is 1.9 or more and 3.2 or less. The joint boot according to claim 1 or 2.
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