JP3841503B2 - boots - Google Patents

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Publication number
JP3841503B2
JP3841503B2 JP00060497A JP60497A JP3841503B2 JP 3841503 B2 JP3841503 B2 JP 3841503B2 JP 00060497 A JP00060497 A JP 00060497A JP 60497 A JP60497 A JP 60497A JP 3841503 B2 JP3841503 B2 JP 3841503B2
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JP
Japan
Prior art keywords
boot
mating member
peripheral surface
thick
circular
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.)
Expired - Fee Related
Application number
JP00060497A
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Japanese (ja)
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JPH10196673A (en
Inventor
真一 杉山
Original Assignee
キーパー株式会社
Priority date (The priority date 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 date listed.)
Filing date
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Priority to JP00060497A priority Critical patent/JP3841503B2/en
Publication of JPH10196673A publication Critical patent/JPH10196673A/en
Application granted granted Critical
Publication of JP3841503B2 publication Critical patent/JP3841503B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【0001】
【発明の属する技術分野】
本発明は、軸と相手部材とが相対運動する機器に装着されるブーツ、特に相手部材の形状が非円形の場合のブーツに関する。
【0002】
【従来の技術】
自動車や産業機械等において、軸と相手部材とが相対運動する継手部分にはブーツが装着されて、内部に充填された潤滑用グリースを保持するとともに、外部からのダストや水等の侵入を防止している。ブーツは、一般にゴム材料や樹脂材料により形成され、軸に固定される部分と相手部材に固定される部分との間が蛇腹になっていて、軸と相手部材との相対変位を吸収できるようになっている。ブーツの取付部の形状は、軸や相手部材が通常は円形に形成されているため、それに倣う円形に形成されているが、トリポード型ジョイントでは、相手部材が非円形に形成されているため、その部分に対応するブーツ取付部の形状も、内周面が非円形で外周面が円形に形成されている。
【0003】
図5は従来のトリポード型ジョイントに使用されるブーツの縦断面図(a)と横断面図(b)を示している。図5において、ブーツは、軸に固定される第1の取付部1と、相手部材に固定される第2の取付部2と、両側の取付部1と2を繋ぐ蛇腹部3とからなる。取付部1と2は、その外周面をバンドで締め付けることにより、軸や相手部材に確実に固定される。第1の取付部1は、内外周面とも軸に合わせて円形であるが、第2の取付部2は、外周面は円形であるのに対し、内周面は相手部材であるジョイント外輪の外周形状に合わせて、円周上に等方向に3ヵ所の厚肉部4とこれらを繋ぐ3ヵ所の薄肉部5とが連続した形状を有する。このように、第2の取付部2を相手部材の形状に合わせて非円形とすることにより、ブーツを相手部材に気密に取り付けることができ、内部のグリースの漏れや外部からの水等の浸入を確実に防止することができる。
【0004】
【発明が解決しようとする課題】
しかしながら、従来のトリポード型ジョイントに使用されるブーツは、第2の取付部2をバンドにより相手部材に締め付けた時などに、図6に示すように、ブーツが円周方向にずれることがあり、相手部材であるジョイント6の凹部7と厚肉部4との間に隙間8、およびジョイント6と薄肉部5との間に隙間9ができてしまい、これら隙間8および9からグリースが漏れたり、外部から水等が浸入することがあった。
【0005】
本発明は、このような従来の問題を解決するものであり、相手部材が非円形であっても、確実にシールすることのできるブーツを提供することを目的とする。
【0006】
【課題を解決するための手段】
本発明は、上記目的を達成するために、ブーツを相手部材に取り付ける取付部の厚肉部と薄肉部との境界部に円周方向に延びるリップを設けたものである。本発明によれば、取付部をバンドにより締め付けて相手部材に固定した時に、たとえブーツが円周方向にずれたとしても、厚肉部および薄肉部と相手部材との間にできる隙間がリップにより塞がれるので、内部のグリースが漏れたり、外部から水等が浸入するのを防ぐことができる。
【0007】
【発明の実施の形態】
本発明によるブーツは、軸と非円形の相手部材とが相対運動する機器に装着されるブーツであって、軸とほぼ相似形の内外周面を有する第1の取付部と、相手部材の非円形部分とほぼ相似形の内周面と円形の外周面とを有する第2の取付部と、第1および第2の取付部の間を繋ぐ蛇腹部とを備え、第2の取付部の内周面には、円周方向に連続する厚肉部と薄肉部とが形成され、この厚肉部と薄肉部との境界部に円周方向に延びる楔形のリップを設けたものであり、第2の取付部をトリポード型ジョイントのような非円形の相手部材にバンドにより固定した時に、たとえブーツが円周方向にずれたとしても、厚肉部および薄肉部と相手部材との間にできる隙間をリップにより塞ぐことができ、内部のグリースが漏れたり、外部から水等が浸入するのを防止することができる。特に、ブーツを比較的硬質の樹脂材料で成形した場合は、相手部材との間に隙間ができやすいので、本発明による効果は著しい。
【0008】
【実施例】
図1は本発明の一実施例を示す要部断面図である。ブーツの全体構成は図5に示した従来例と同じであり、軸に固定される第1の取付部1と、相手部材に固定される第2の取付部2と、両側取付部を繋ぐ蛇腹部3とで構成されている。第1の取付部1は、内外周面とも軸に合わせて円形であるが、第2の取付部2は、外周面は円形であるのに対し、内周面は相手部材の外周形状に合わせて、円周上に等方向に3ヵ所の厚肉部4とこれらを繋ぐ3ヵ所の薄肉部5とが連続した形状を有する。そして本発明は、このような従来例の厚肉部4と薄肉部5との境界部に、図1に示すように、薄肉部5の内側に向いたリップ10および13と、厚肉部4の内側に向いたリップ11および12とを設けたものである。それぞれのリップ10、11、12、13は、先端部が細い楔形に形成されている。そして、図2に拡大して示すように、薄肉部5の内側のリップ10の内側面aは、外側面bが薄肉部5の内周面cに圧接した時に、薄肉部5の内周面cの曲面に沿うように湾曲している。また、厚肉部4の内側のリップ11の内側面dも、外側面eが厚肉部4の内周面fに圧接した時に、厚肉部4の内周面fの曲面に沿うように湾曲している。厚肉部4の反対側の境界部に形成されたリップ12、13も同様に形成されている。
【0009】
このように構成されたブーツの取付部を相手部材に取り付けてその外周をバンドで締め付けた時、図3に示すように、取付部の厚肉部4が相手部材であるジョイント6の凹部7に正しく位置決めされている場合は、各リップ10〜13はバンド14に締め付けられてジョイント6に圧接し、取付部のジョイント6に対するシール性を確保することができる。また、図4に示すように、厚肉部4が矢印Aで示す円周方向にずれて取り付けられた場合は、従来は、図6に示すように、厚肉部4とジョイント6との間に隙間8が形成され、薄肉部5とジョイント6との間に隙間9が形成されるが、本実施の形態では、隙間8、9がそれぞれリップ11、13により埋められるので、取付部のジョイント6に対するシール性を確保することができる。厚肉部4が矢印Aとは反対側にずれた場合には、それぞれ反対側にできた隙間をリップ10、12が埋めることになる。
【0010】
上記実施の形態では、厚肉部4とその両側の薄肉部5との境界部に両方向にリップ10、11および12、13を設けたが、リップの数および位置は特に限定されるものではなく、厚肉部4がジョイント6の凹部7に対してずれる方向が決まっている場合には、例えばA方向に決まっている場合には、リップ11と13を設けるだけでもよい。また厚肉部がそれ自身のボリュームにより隙間を吸収できる場合には、薄肉部の内側のリップ10,13を設けるだけでもよい。
【0011】
また上記実施の形態は、本発明をトリポード型ジョイントに装着されるブーツに適応した例であるが、相手部材が非円形である他の機器に使用するブーツに対しても同様に適用することができる。
【0012】
さらに上記実施の形態は、本発明を比較的硬質の樹脂製ブーツに適応した例であるが、これに限定されるものではない。
【0013】
【発明の効果】
以上のように、本発明のブーツによれば、相手部材に取り付ける取付部の厚肉部と薄肉部との境界部に円周方向に延びるリップを設けたものであり、取付部をバンドにより締め付けて相手部材に固定した時に、たとえブーツが円周方向にずれたとしても、厚肉部および薄肉部と相手部材との間にできる隙間がリップにより塞がれるので、内部のグリースが漏れたり、外部から水等が浸入するのを防ぐことができる。
【図面の簡単な説明】
【図1】本発明の一実施例を示すブーツの相手部材に取り付ける部分の部分断面図。
【図2】同ブーツの拡大部分断面図。
【図3】同ブーツが相手部材に正しく取り付けられた場合の部分断面図。
【図4】同ブーツが相手部材にずれた状態で取り付けられた場合の部分断面図。
【図5】従来のブーツの縦断面図(a)と横断面図(b)。
【図6】従来のブーツが相手部材にずれた状態で取り付けられた場合の部分断面図。
【符号の説明】
1 第1の取付部
2 第2の取付部
3 蛇腹部
4 厚肉部
5 薄肉部
6 ジョイント(相手部材)
7 凹部
8、9 隙間
10、11、12、13 リップ
14 バンド
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boot that is mounted on a device in which a shaft and a mating member move relative to each other, and more particularly to a boot when the mating member has a non-circular shape.
[0002]
[Prior art]
In automobiles and industrial machines, boots are attached to the joints where the shaft and the mating member move relative to hold the lubricating grease filled inside, and prevent dust and water from entering from the outside. is doing. The boot is generally formed of a rubber material or a resin material, and has a bellows between the portion fixed to the shaft and the portion fixed to the mating member so that the relative displacement between the shaft and the mating member can be absorbed. It has become. The shape of the mounting part of the boot is usually formed in a circular shape following the shaft and the mating member, but in the tripod type joint, the mating member is formed in a non-circular shape. The shape of the boot mounting portion corresponding to that portion is also formed such that the inner peripheral surface is non-circular and the outer peripheral surface is circular.
[0003]
FIG. 5 shows a longitudinal sectional view (a) and a transverse sectional view (b) of a boot used in a conventional tripod type joint. In FIG. 5, the boot includes a first mounting portion 1 that is fixed to the shaft, a second mounting portion 2 that is fixed to the mating member, and a bellows portion 3 that connects the mounting portions 1 and 2 on both sides. The attaching portions 1 and 2 are securely fixed to the shaft and the mating member by tightening the outer peripheral surface with a band. The first mounting portion 1 has a circular shape on the inner and outer peripheral surfaces in accordance with the axis, while the second mounting portion 2 has a circular outer peripheral surface, whereas the inner peripheral surface is a joint outer ring as a counterpart member. In accordance with the outer peripheral shape, three thick portions 4 and three thin portions 5 connecting these in the same direction on the circumference have a continuous shape. In this way, by making the second mounting portion 2 non-circular according to the shape of the mating member, the boot can be hermetically mounted to the mating member, leaking internal grease or intrusion of water or the like from the outside Can be reliably prevented.
[0004]
[Problems to be solved by the invention]
However, the boot used in the conventional tripod type joint may be displaced in the circumferential direction as shown in FIG. 6 when the second mounting portion 2 is fastened to the mating member by a band. A gap 8 is formed between the concave portion 7 of the joint 6 which is the counterpart member and the thick portion 4, and a gap 9 is formed between the joint 6 and the thin portion 5. Grease leaks from these gaps 8 and 9, In some cases, water or the like entered from the outside.
[0005]
The present invention solves such a conventional problem, and an object of the present invention is to provide a boot that can be surely sealed even if the mating member is non-circular.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is provided with a lip extending in the circumferential direction at the boundary between the thick part and the thin part of the attachment part for attaching the boot to the mating member. According to the present invention, when the mounting portion is tightened with the band and fixed to the mating member, even if the boot is displaced in the circumferential direction, the gap between the thick portion and the thin portion and the mating member is formed by the lip. Since it is blocked, it is possible to prevent internal grease from leaking and water from entering from the outside.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A boot according to the present invention is a boot that is attached to a device in which a shaft and a non-circular mating member move relative to each other, and includes a first attachment portion having an inner and outer peripheral surface substantially similar to the shaft, A second mounting portion having an inner peripheral surface substantially similar to the circular portion and a circular outer peripheral surface, and a bellows portion connecting the first mounting portion and the second mounting portion; A thick wall portion and a thin wall portion that are continuous in the circumferential direction are formed on the peripheral surface, and a wedge-shaped lip extending in the circumferential direction is provided at a boundary portion between the thick wall portion and the thin wall portion. Even if the boot is displaced in the circumferential direction when the mounting part 2 is fixed to a non-circular mating member such as a tripod type joint with a band, a gap formed between the thick part and the thin part and the mating member Can be closed by a lip, causing internal grease to leak or water to enter from the outside. It is possible to prevent the. In particular, when the boot is formed of a relatively hard resin material, a gap is easily formed between the boot member and the effect of the present invention is remarkable.
[0008]
【Example】
FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the present invention. The overall configuration of the boot is the same as that of the conventional example shown in FIG. 5. The first mounting portion 1 fixed to the shaft, the second mounting portion 2 fixed to the mating member, and the bellows connecting both side mounting portions. Part 3. The first mounting portion 1 has a circular shape along the axis on both the inner and outer peripheral surfaces, whereas the second mounting portion 2 has a circular outer peripheral surface, whereas the inner peripheral surface matches the outer peripheral shape of the mating member. Thus, the three thick portions 4 and the three thin portions 5 connecting the three thick portions 4 are connected in the same direction on the circumference. In the present invention, at the boundary between the thick portion 4 and the thin portion 5 of the conventional example, the lips 10 and 13 facing the inside of the thin portion 5 and the thick portion 4 as shown in FIG. Are provided with lips 11 and 12 facing inward. Each lip 10, 11, 12, 13 is formed in a wedge shape with a thin tip. As shown in FIG. 2 in an enlarged manner, the inner surface a of the lip 10 on the inner side of the thin portion 5 has an inner peripheral surface of the thin portion 5 when the outer surface b is in pressure contact with the inner peripheral surface c of the thin portion 5. It is curved along the curved surface of c. Further, the inner side surface d of the lip 11 on the inner side of the thick portion 4 is also along the curved surface of the inner peripheral surface f of the thick portion 4 when the outer surface e is pressed against the inner peripheral surface f of the thick portion 4. It is curved. The lips 12 and 13 formed at the boundary portion on the opposite side of the thick portion 4 are also formed in the same manner.
[0009]
When the mounting portion of the boot configured in this way is attached to the mating member and the outer periphery thereof is tightened with a band, as shown in FIG. 3, the thick portion 4 of the mounting portion is in the concave portion 7 of the joint 6 which is the mating member. When correctly positioned, each of the lips 10 to 13 is fastened to the band 14 and pressed against the joint 6, and the sealing performance of the mounting portion with respect to the joint 6 can be ensured. In addition, as shown in FIG. 4, when the thick portion 4 is attached while being displaced in the circumferential direction indicated by the arrow A, conventionally, as shown in FIG. In this embodiment, the gaps 8 and 9 are filled with the lips 11 and 13, respectively. 6 can be secured. When the thick part 4 is shifted to the opposite side to the arrow A, the lips 10 and 12 fill the gaps formed on the opposite side.
[0010]
In the above embodiment, the lips 10, 11 and 12, 13 are provided in both directions at the boundary between the thick portion 4 and the thin portions 5 on both sides thereof, but the number and position of the lips are not particularly limited. When the direction in which the thick portion 4 is displaced with respect to the concave portion 7 of the joint 6 is determined, for example, when the direction is determined in the A direction, only the lips 11 and 13 may be provided. If the thick portion can absorb the gap by its own volume, it is only necessary to provide the lips 10 and 13 inside the thin portion.
[0011]
Moreover, although the said embodiment is an example which applied this invention to the boot with which a tripod type joint is mounted | worn, it can apply similarly also to the boot used for the other apparatus with which the other member is non-circular. it can.
[0012]
Furthermore, although the said embodiment is an example which applied this invention to the comparatively hard resin boots, it is not limited to this.
[0013]
【The invention's effect】
As described above, according to the boot of the present invention, the lip extending in the circumferential direction is provided at the boundary between the thick part and the thin part of the attachment part to be attached to the mating member, and the attachment part is tightened by the band. Even when the boot is displaced in the circumferential direction, the gap formed between the thick wall portion and the thin wall portion and the mating member is closed by the lip, so that the internal grease leaks, It is possible to prevent water from entering from the outside.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a portion attached to a mating member of a boot according to an embodiment of the present invention.
FIG. 2 is an enlarged partial cross-sectional view of the boot.
FIG. 3 is a partial cross-sectional view when the boot is correctly attached to the mating member.
FIG. 4 is a partial cross-sectional view when the boot is attached to the counterpart member in a shifted state.
FIG. 5 is a longitudinal sectional view (a) and a transverse sectional view (b) of a conventional boot.
FIG. 6 is a partial cross-sectional view when a conventional boot is attached in a state of being shifted to a counterpart member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st attachment part 2 2nd attachment part 3 Bellows part 4 Thick part 5 Thin part 6 Joint (mating member)
7 Recess 8, 9 Gap 10, 11, 12, 13 Lip 14 Band

Claims (3)

軸と非円形の相手部材とが相対運動する機器に装着されるブーツであって、軸とほぼ相似形の内外周面を有する第1の取付部と、相手部材の非円形部分とほぼ相似形の内周面と円形の外周面とを有する第2の取付部と、第1および第2の取付部の間を繋ぐ蛇腹部とを備え、第2の取付部の内周面には、円周方向に連続する厚肉部と薄肉部とが形成され、この厚肉部と薄肉部との境界部に円周方向に延びる楔形のリップを備えたブーツ。A boot that is mounted on a device in which a shaft and a non-circular mating member move relative to each other, the first mounting portion having an inner and outer peripheral surface substantially similar to the shaft, and a non-circular portion of the mating member approximately similar A second mounting portion having an inner peripheral surface and a circular outer peripheral surface, and a bellows portion connecting the first and second mounting portions, and the inner peripheral surface of the second mounting portion has a circular shape. A boot having a thick-walled portion and a thin-walled portion that are continuous in the circumferential direction, and a wedge-shaped lip extending in the circumferential direction at a boundary portion between the thick-walled portion and the thin-walled portion. トリポード型ジョイントに装着される請求項1に記載のブーツ。The boot of Claim 1 with which a tripod type joint is mounted | worn. ブーツの材質が樹脂であることを特徴とする請求項1または2に記載のブーツ。The boot according to claim 1 or 2, wherein the boot is made of resin.
JP00060497A 1997-01-07 1997-01-07 boots Expired - Fee Related JP3841503B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP00060497A JP3841503B2 (en) 1997-01-07 1997-01-07 boots

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP00060497A JP3841503B2 (en) 1997-01-07 1997-01-07 boots

Publications (2)

Publication Number Publication Date
JPH10196673A JPH10196673A (en) 1998-07-31
JP3841503B2 true JP3841503B2 (en) 2006-11-01

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010045044A (en) * 1999-11-02 2001-06-05 김재복 Bellows for secession prevention to spider die of uniform joint
JP2004169726A (en) * 2002-11-15 2004-06-17 Toyo Tire & Rubber Co Ltd Boot for constant velocity joint, and mounting device
US7775891B2 (en) 2004-11-19 2010-08-17 Honda Motor Co., Ltd. Boot for joint
US8348774B2 (en) 2005-02-14 2013-01-08 Ntn Corporation Constant velocity joint and constant velocity joint boot
JP2006258122A (en) * 2005-03-15 2006-09-28 Ntn Corp Slide type constant velocity universal joint

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