JP2012177448A - Dust cover for ball joint - Google Patents

Dust cover for ball joint Download PDF

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JP2012177448A
JP2012177448A JP2011041554A JP2011041554A JP2012177448A JP 2012177448 A JP2012177448 A JP 2012177448A JP 2011041554 A JP2011041554 A JP 2011041554A JP 2011041554 A JP2011041554 A JP 2011041554A JP 2012177448 A JP2012177448 A JP 2012177448A
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ball joint
small
diameter opening
dust cover
umbrella
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Shigeyuki Ono
茂之 小野
Shinji Abe
信二 阿部
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Nok Corp
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Nok Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a dust cover for a ball joint which does not deteriorate seal performance at a small-diameter opening and does not impair flexibility even if the ball joint has a wide-angled specification, does not cause the twist of a membrane and friction damage caused by rubbing, and can maintain favorable seal performance.SOLUTION: The dust cover for the ball joint which is formed of a rubber-shaped elastic material composed of the member having a large-diameter opening which is fixedly held by an annular pressing ring at the external peripheral face of a socket of the ball joint, a small-diameter opening which is held at the axial side of the ball joint, a cylindrical part which extends toward the small-diameter part from the large-diameter part, and an umbrella-shaped part which connects the end of the cylindrical part and the small-diameter part. A plurality of ribs which radially extend to the vicinity of a connecting part between the umbrella-shaped part and the cylindrical part from the small-diameter part are equally arranged on the circumference on the surface of the umbrella-shaped part.

Description

本発明は、ボールジョイント用ダストカバーに関する。
また、本発明は、自動車懸架装置、操舵装置等に使用されるボールジョイント用ダストカバーに関する。 The present invention relates to a dust cover for a ball joint.
The present invention also relates to a ball joint dust cover used for an automobile suspension device, a steering device, and the like.

従来、ボールジョイント継ぎ手部の防塵、防水を目的としてダストカバーが装着されているボールジョイントとしては、図３に示すボールジョイント用ダストカバーが知られている。   Conventionally, a ball joint dust cover shown in FIG. 3 is known as a ball joint to which a dust cover is attached for the purpose of dustproofing and waterproofing the ball joint joint.

この種ボールジョイント用ダストカバーのシール構造は、ボールスタッド１００の一端に形成された球頭部２００がソケット３００内に保持されている。
そして、ボールスタッド１００の他端の軸４００は、ナックル５００に締め付け固定されている。
一方、ゴム状弾性材製ダストカバー６００の一端大径開口部８００が、ソケット３００の外周面に円環状押さえリング９００により固定保持され、他端小径開口部１５０が軸４００に保持された構成となっている。 In this kind of ball joint dust cover sealing structure, a ball head 200 formed at one end of a ball stud 100 is held in a socket 300.
The shaft 400 at the other end of the ball stud 100 is fastened and fixed to the knuckle 500.
On the other hand, one end large-diameter opening 800 of the rubber elastic material dust cover 600 is fixed and held on the outer peripheral surface of the socket 300 by an annular holding ring 900, and the other end small-diameter opening 150 is held on the shaft 400. It has become.

この種、従来のダストカバー６００の小径開口部１５０は、ナックル５００の下面に押し当てられ、ダストカバー８００内へのダストの侵入を阻止している。
また、ダストカバー６００の小径開口部１５０には、金属材製の補強環が埋設されている。
このことにより、小径開口部１５０の内周面を軸４００の外周面に嵌合保持して、ダストカバー６００内からのグリースの漏出を防ぐ構造になっている。 This type of small-diameter opening 150 of the conventional dust cover 600 is pressed against the lower surface of the knuckle 500 to prevent dust from entering the dust cover 800.
Further, a reinforcing ring made of a metal material is embedded in the small diameter opening 150 of the dust cover 600.
Thus, the inner peripheral surface of the small-diameter opening 150 is fitted and held on the outer peripheral surface of the shaft 400 to prevent the grease from leaking out from the dust cover 600.

近年、特にスタビラーザーのボールジョイントにおいては、車両環境に対する適用拡大の為、要求される稼働角度が年々広角になっている。
ボールジョイントの広角化とは、ボールスタッドのソケットに対する傾斜角がより大きくなる事である。
この、ボールジョイントの広角化に伴い、ボールジョイント用ダストカバーについても広角で使用出来る事が求められている。
この結果、特にゴム状弾性を喪失する低温環境においては、図３に示した形状のボールジョイント用ダストカバーでは十分な膜長を確保できないため、対応が難しくなってきている。 In recent years, especially for ball joints of stabilizers, the required operating angle has become wider year by year in order to expand the application to the vehicle environment.
The widening of the ball joint means that the inclination angle of the ball stud with respect to the socket becomes larger.
With the widening of the ball joint, it is required that the dust cover for the ball joint can be used at a wide angle.
As a result, particularly in a low temperature environment in which rubber-like elasticity is lost, it is difficult to cope with the ball joint dust cover having the shape shown in FIG.

そこで、図３に示した形状のボールジョイント用ダストカバーの膜の長さを長く設計した場合、ボールジョイントが揺動した際、縮み側の膜が円環状押さえリング９００側に垂れ下がり、円環状押さえリング９００の角部と干渉して擦れ摩耗し、膜破断を発生した。   Therefore, when the length of the film of the dust cover for the ball joint having the shape shown in FIG. 3 is designed to be long, when the ball joint is swung, the film on the contraction side hangs down to the ring holding ring 900 side, and the ring holding The film was rubbed and worn by interference with the corners of the ring 900, and film breakage occurred.

更に、この変形を防止する為に、膜の肉厚を変更すると、局部的な圧縮歪みの増大を招来すると共に、揺動による膜変形の影響で小径開口部１５０が変形し、小径開口部１５０におけるシール性が大きく低下する問題を招来した。   Further, if the thickness of the film is changed in order to prevent this deformation, a local compressive strain is increased, and the small-diameter opening 150 is deformed due to the influence of the film deformation due to the swinging. This has caused a problem that the sealing performance of the material is greatly reduced.

この様な問題を解決する目的で、膜に放射状のリブを形成する提案がなされた。（特許文献１〜３）
しかし、これらのリブは、膜の軸方向全体に設ける態様としたり、膜の外周面側に設けたり、膜の中央に行くに従い太くなる構成としている為、ダストカバーの膜の柔軟性を阻害したり、リブの補強効果が十分得られない問題を招来した。 In order to solve such problems, proposals have been made to form radial ribs in the film. (Patent Documents 1 to 3)
However, these ribs are provided in the whole axial direction of the film, are provided on the outer peripheral surface side of the film, or are configured to become thicker toward the center of the film, so that the flexibility of the dust cover film is hindered. Or the effect of reinforcing ribs is not sufficient.

実開昭５８−１９６４６９号公報Japanese Utility Model Publication No. 58-196469 実開昭５４−５８５５６号公報Japanese Utility Model Publication No. 54-58556 実開昭５０−１１７２５５号公報Japanese Utility Model Publication No. 50-117255

本発明は、このような課題に鑑みてなされたものであり、ボールジョイントの広角化仕様においても、小径開口部におけるシール性が低下する事及び膜の柔軟性を阻害が無く、膜が捩れたり、擦れる事による摩耗損傷も無い、良好な密封性を維持出来るボールジョイント用ダストカバーを提供することを目的とする。   The present invention has been made in view of such a problem, and even in the wide angle specification of the ball joint, the sealing performance at the small-diameter opening is deteriorated and the flexibility of the film is not hindered, and the film is twisted. An object of the present invention is to provide a dust cover for a ball joint that is free from abrasion damage due to rubbing and can maintain good sealing performance.

本発明のボールジョイント用ダストカバーは、ボールジョイントのソケットの外周面に円環状押さえリングにより固定保持される大径開口部と、ボールジョイントの軸側に保持される小径開口部と、前記大径開口部から前記小径開口部に向かって伸びる円筒状部及び前記円筒状部の端部と前記小径開口部とを連結している傘状部とを備える膜部とより成るゴム状弾性材製ボールジョイント用ダストカバーにおいて、
前記傘状部の表面に、前記小径開口部側から、前記傘状部と前記円筒状部との連結部近傍まで放射状に伸びる複数本のリブを円周上等配に設けた構成とした。 The dust cover for a ball joint according to the present invention includes a large-diameter opening fixed and held on the outer peripheral surface of a ball joint socket by an annular pressure ring, a small-diameter opening held on the shaft side of the ball joint, and the large-diameter A ball made of a rubber-like elastic material comprising a cylindrical portion extending from an opening portion toward the small-diameter opening portion, and a membrane portion including an end portion of the cylindrical portion and an umbrella-like portion connecting the small-diameter opening portion. In the dust cover for joints,
On the surface of the umbrella-shaped portion, a plurality of ribs extending radially from the small-diameter opening side to the vicinity of the connecting portion between the umbrella-shaped portion and the cylindrical portion are provided on the circumference at equal intervals.

本発明は、以下に記載されるような効果を奏する。
請求項１記載の発明のボールジョイント用ダストカバーによれば、ボールジョイントの広角化仕様においても、小径開口部におけるシール性が低下する事及び膜の柔軟性を阻害することが無く、膜が捩れたり、擦れる事による摩耗損傷も無い、良好な密封性を維持出来る
更に、請求項２記載の発明のボールジョイント用ダストカバーによれば、膜の柔軟性を阻害する事が無く、より広角化仕様に対応出来ると共に、膜部にしわが生じ、ボールジョイントの揺動回転運動により、膜が捩れを発生する問題も回避出来る。 The present invention has the following effects.
According to the dust cover for a ball joint of the first aspect of the invention, even in the ball joint widening specification, the sealing performance at the small-diameter opening is not deteriorated and the flexibility of the film is not hindered, and the film is twisted. In addition, the ball joint dust cover according to the second aspect of the present invention can maintain a good sealing performance without causing damage to the film, and can prevent widening of the film. In addition, it is possible to avoid the problem that the film portion is wrinkled and the film is twisted by the swinging and rotating motion of the ball joint.

更に、請求項３記載の発明のボールジョイント用ダストカバーによれば、膜の柔軟性を阻害する事が無く、より広角化仕様に対応出来ると共に、小径開口部におけるシール性を低下させる心配が無い。
更に、請求項４記載の発明のボールジョイント用ダストカバーによれば、リブの補強効果を高められ、傘状部の変形をより効果的に抑止出来る。 Furthermore, according to the dust cover for a ball joint of the invention described in claim 3, the flexibility of the film is not hindered, it is possible to cope with a wider angle specification, and there is no fear of reducing the sealing performance in the small diameter opening. .
Furthermore, according to the dust cover for a ball joint of the invention described in claim 4, the rib reinforcing effect can be enhanced, and the deformation of the umbrella-shaped portion can be more effectively suppressed.

本発明に係る、第１の実施態様のボールジョイント用ダストカバーの縦断面図。The longitudinal cross-sectional view of the dust cover for ball joints of the 1st embodiment based on this invention. 本発明に係る、第２の実施態様のボールジョイント用ダストカバーの縦断面図。The longitudinal cross-sectional view of the dust cover for ball joints of the 2nd embodiment based on this invention. 従来技術に係る、ダストカバーをボールジョイントに装着した縦断面図。The longitudinal cross-sectional view which attached the dust cover to the ball joint based on a prior art.

以下、本発明を実施するための形態について説明する。
図１に示される様に、本発明に係るゴム状弾性材製のボールジョイント用ダストカバーの第１の実施態様は、ボールジョイントのソケットの外周面に円環状押さえリング１１により固定保持される大径開口部１と、ボールジョイントの軸側に保持される小径開口部２と、この大径開口部１から小径開口部２に向かって伸びる円筒状部３１及びこの円筒状部３１の端部と小径開口部２とを連結している傘状部３２とを備える膜部３とより構成されている。 Hereinafter, modes for carrying out the present invention will be described.
As shown in FIG. 1, the first embodiment of the dust cover for ball joint made of rubber-like elastic material according to the present invention is large-sized and fixed to the outer peripheral surface of the socket of the ball joint by an annular pressing ring 11. A diameter opening 1, a small diameter opening 2 held on the axial side of the ball joint, a cylindrical portion 31 extending from the large diameter opening 1 toward the small diameter opening 2, and an end of the cylindrical portion 31 It is comprised from the film | membrane part 3 provided with the umbrella-shaped part 32 which has connected the small diameter opening part 2. As shown in FIG.

そして、この傘状部３２の内周面側表面には、小径開口部２側から、傘状部３２と円筒状部３１との連結部３３近傍まで放射状に伸びる複数本のリブ４を円周上等配に設けている。
また、このリブ４の形状は、小径開口部２側から連結部３３側に向かって、その厚みが減少する楔形状に設計されている。 A plurality of ribs 4 extending radially from the small-diameter opening 2 side to the vicinity of the connection portion 33 between the umbrella-shaped portion 32 and the cylindrical portion 31 are circumferentially provided on the inner peripheral surface side surface of the umbrella-shaped portion 32. It is set up in the same level.
Further, the shape of the rib 4 is designed in a wedge shape in which the thickness decreases from the small diameter opening 2 side toward the connecting portion 33 side.

この事により、膜の柔軟性を阻害する事が無く、より広角化仕様に対応出来ると共に、小径開口部２におけるシール性を低下させる心配が無い。
この実施態様においては、リブ４の数は、傘状部３２の内周面に４個等配に設ける態様としたが、使用条件により３個以上の数のリブ４が適宜選択して用いられる。
この様に、円筒状部３１にリブ４を設ける事無く、円筒状部３１に近付くに従いリブ４の肉厚を薄くしている為、膜部３の柔軟性を損なう事が無いと共に、小径開口部２近傍においては、リブ４の肉厚が厚くなっている為、小径開口部２の変形を効果的に阻止出来ることにより、小径開口部２内周面に設けたシールリップ２１の機能を長期間良好に維持出来る。 As a result, the flexibility of the film is not hindered, it is possible to cope with a wider angle specification, and there is no fear that the sealing performance in the small-diameter opening 2 is lowered.
In this embodiment, the number of the ribs 4 is an embodiment in which four ribs 4 are equally arranged on the inner peripheral surface of the umbrella-shaped portion 32, but three or more ribs 4 are appropriately selected and used depending on use conditions. .
Thus, without providing the rib 4 in the cylindrical part 31, the thickness of the rib 4 is reduced as it approaches the cylindrical part 31, so that the flexibility of the film part 3 is not impaired and the small-diameter opening is provided. Since the rib 4 is thick in the vicinity of the portion 2, the function of the seal lip 21 provided on the inner peripheral surface of the small-diameter opening 2 can be increased by effectively preventing the deformation of the small-diameter opening 2. Good period can be maintained.

ついで、図２に基づき、本発明に係るゴム状弾性材製のボールジョイント用ダストカバーの第２の実施態様を説明する。
第１の実施態様と相違する点は、リブ４の形状である。
このリブ４の形状は、小径開口部２と連結部３３との略中央でその厚み及び幅が最大となる船底形状に設計されている。
この事により、膜部３の柔軟性を阻害する事が無く、より広角化仕様に対応出来ると共に、膜部３にしわが生じ、ボールジョイントの揺動回転運動により、膜が捩れを発生する問題も回避出来る。 Next, a second embodiment of the dust cover for ball joint made of rubber-like elastic material according to the present invention will be described with reference to FIG.
The difference from the first embodiment is the shape of the rib 4.
The shape of the rib 4 is designed to be a ship bottom shape having the maximum thickness and width at the approximate center between the small-diameter opening 2 and the connecting portion 33.
As a result, the flexibility of the film part 3 is not obstructed, and it is possible to cope with a wider angle specification, and the film part 3 is wrinkled, and the film is twisted due to the swinging and rotating motion of the ball joint. Can be avoided.

尚、ダストカバーの材質は、クロロプレン等のゴム状弾性材や、ポリエステル系エラストマー、熱可塑性ポリウレタン等の熱可塑性エラストマーから、適宜用途に合わせ選択して使用される。
また、小径開口部２には、ナックルと弾性接触しているダストリップ２２を設けている。
このため、外部からダストカバー内へのダストの侵入を阻止出来る。 In addition, the material of the dust cover is appropriately selected from a rubber-like elastic material such as chloroprene, or a thermoplastic elastomer such as a polyester-based elastomer or a thermoplastic polyurethane.
The small-diameter opening 2 is provided with a dust lip 22 in elastic contact with the knuckle.
Therefore, it is possible to prevent dust from entering the dust cover from the outside.

第１の実施態様のリブ４は、小径開口部２近傍において、リブ４の肉厚が最大になる様に設計されている為、小径開口部２の変形を抑止出来、小径開口部２内周面に設けたシールリップ２１の機能を長期間良好に維持出来る。
一方、第２の実施態様のリブ４は、傘状部３２の略中央で肉厚及び幅が最大となる設計としている為、傘状部３２を補強する効果が大きく、傘状部３２の過大な変形を効果的に抑止出来る。 Since the rib 4 of the first embodiment is designed so that the thickness of the rib 4 is maximized in the vicinity of the small-diameter opening 2, the deformation of the small-diameter opening 2 can be suppressed, and the inner periphery of the small-diameter opening 2 can be suppressed. The function of the seal lip 21 provided on the surface can be maintained well for a long period of time.
On the other hand, since the rib 4 of the second embodiment is designed to have the maximum thickness and width at the approximate center of the umbrella-shaped portion 32, the effect of reinforcing the umbrella-shaped portion 32 is great, and the umbrella-shaped portion 32 is excessively large. Effective deformation can be effectively suppressed.

第１の実施態様のリブ４と第２の実施態様のリブ４の何れかを選択するかは、使用環境、使用条件に合わせ適宜選択して用いられる。
尚、リブ４の形状は、これらに限らず、三角形状等適宜選択して用いられる。
また、リブ４は、傘状部３２の内周面に設ける態様としたが、外周面に設ける態様としても、一定の効果は期待出来るが、内周面に設ける方がリブ４の補強効果等の観点から好ましい。 Whether to select the rib 4 of the first embodiment or the rib 4 of the second embodiment is appropriately selected according to the use environment and use conditions.
In addition, the shape of the rib 4 is not limited to these, and a triangular shape or the like is appropriately selected and used.
In addition, the rib 4 is provided on the inner peripheral surface of the umbrella-shaped portion 32. However, as the aspect provided on the outer peripheral surface, a certain effect can be expected. From the viewpoint of

また、本発明は上述の発明を実施するための最良の形態に限らず本発明の要旨を逸脱することなくその他種々の構成を採り得ることはもちろんである。   Further, the present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

自動車の懸架装置及び操舵装置等に使用されるボールジョイントに使用できる。   It can be used for ball joints used in automobile suspension systems and steering systems.

１ 大径開口部
２ 小径開口部
３ 膜部
４ リブ
１１ 押えリング
２１ シールリップ
２２ ダストリップ
３１ 円筒状部
３２ 傘状部
３３ 連結部 DESCRIPTION OF SYMBOLS 1 Large diameter opening part 2 Small diameter opening part 3 Membrane part 4 Rib 11 Holding ring 21 Seal lip 22 Dustrip 31 Cylindrical part 32 Umbrella part 33 Connection part

Claims (4)

ボールジョイントのソケットの外周面に円環状押さえリング（１１）により固定保持される大径開口部（１）と、ボールジョイントの軸側に保持される小径開口部（２）と、前記大径開口部（１）から前記小径開口部（２）に向かって伸びる円筒状部（３１）及び前記円筒状部（３１）の端部と前記小径開口部（２）とを連結している傘状部（３２）とを備える膜部（３）とより成るゴム状弾性材製ボールジョイント用ダストカバーにおいて、
前記傘状部（３２）の表面に、前記小径開口部（２）側から、前記傘状部（３２）と前記円筒状部（３１）との連結部（３３）近傍まで放射状に伸びる複数本のリブ（４）を円周上等配に設けたことを特徴とするボールジョイント用ダストカバー。 A large-diameter opening (1) fixed and held on the outer peripheral surface of the socket of the ball joint by an annular holding ring (11), a small-diameter opening (2) held on the shaft side of the ball joint, and the large-diameter opening A cylindrical part (31) extending from the part (1) toward the small-diameter opening (2) and an umbrella-like part connecting the end of the cylindrical part (31) and the small-diameter opening (2) In a dust cover for a ball joint made of a rubber-like elastic material comprising a membrane part (3) comprising (32),
A plurality of pieces extending radially on the surface of the umbrella-shaped portion (32) from the small-diameter opening (2) side to the vicinity of the connecting portion (33) between the umbrella-shaped portion (32) and the cylindrical portion (31). The ball joint dust cover is characterized in that the ribs (4) are provided at equal intervals on the circumference. 前記リブ（４）が、前記小径開口部（２）側から前記連結部（３３）側に向かってその厚みが減少する楔形状に設計されていることを特徴とする請求項１記載のボールジョイント用ダストカバー。   The ball joint according to claim 1, wherein the rib (4) is designed in a wedge shape whose thickness decreases from the small-diameter opening (2) side toward the connecting portion (33) side. Dust cover. 前記リブ（４）が、前記小径開口部（２）と前記連結部（３３）との略中央でその厚み及び幅が最大となる船底形状に設計されていることを特徴とする請求項１記載のボールジョイント用ダストカバー。   The rib (4) is designed to have a bottom shape that maximizes its thickness and width at the approximate center between the small-diameter opening (2) and the connecting portion (33). Dust cover for ball joints. 前記リブ（４）が、前記傘状部（３２）の内周面側に設けられていることを特徴とする請求項１〜３のいずれか一項に記載のボールジョイント用ダストカバー。   The dust cover for a ball joint according to any one of claims 1 to 3, wherein the rib (4) is provided on an inner peripheral surface side of the umbrella-shaped portion (32).
JP2011041554A 2011-02-28 2011-02-28 Dust cover for ball joint Withdrawn JP2012177448A (en)

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