JP5288105B2 - Universal joint seal - Google Patents

Universal joint seal Download PDF

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JP5288105B2
JP5288105B2 JP2008105545A JP2008105545A JP5288105B2 JP 5288105 B2 JP5288105 B2 JP 5288105B2 JP 2008105545 A JP2008105545 A JP 2008105545A JP 2008105545 A JP2008105545 A JP 2008105545A JP 5288105 B2 JP5288105 B2 JP 5288105B2
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seal
universal joint
internal pressure
space
lip
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JP2009257405A (en
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忍 宗形
義宏 葛巻
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Nok Corp
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Nok Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
    • F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
    • F16D3/40—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another with intermediate member provided with two pairs of outwardly-directed trunnions on intersecting axes
    • F16D3/41—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another with intermediate member provided with two pairs of outwardly-directed trunnions on intersecting axes with ball or roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7809—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for needle roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
    • F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
    • F16D3/382—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another constructional details of other than the intermediate member
    • F16D3/385—Bearing cup; Bearing construction; Bearing seal; Mounting of bearing on the intermediate member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • F16C19/466—Needle bearings with one row or needles comprising needle rollers and an outer ring, i.e. subunit without inner ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C21/00—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement
    • F16C21/005—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement the external zone of a bearing with rolling members, e.g. needles, being cup-shaped, with or without a separate thrust-bearing disc or ring, e.g. for universal joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/08—Details or arrangements of sealings not provided for in group F16D3/84

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)

Description

本発明は、密封装置に係り、更に詳しくは、自動車等車両のステアリングジョイントやプロペラシャフト等に使用する自在継手に用いられる自在継手用シールに関するものである。   The present invention relates to a sealing device, and more particularly to a seal for a universal joint used for a universal joint used for a steering joint, a propeller shaft, or the like of a vehicle such as an automobile.

従来から、自動車等車両のステアリングジョイントやプロペラシャフト等に使用する自在継手として図３に示すものが知られており、この自在継手１には、スパイダー２、スパイダー２の端部外周を取り囲むカップ３、スパイダー２とカップ３の間に介装されるベアリング４が設けられるとともに、継手内部のグリースおよび外部の泥水等のダストをシールすべく自在継手用シール５が設けられている。   Conventionally, the universal joint shown in FIG. 3 has been known as a universal joint used for a steering joint, a propeller shaft, etc. of a vehicle such as an automobile. A bearing 4 interposed between the spider 2 and the cup 3 is provided, and a universal joint seal 5 is provided for sealing dust such as grease inside the joint and outside muddy water.

図４に拡大して示すように、自在継手用シール５には、スパイダー２に固定される固定部６と、固定部６に一体的に設けられ、カップ３に摺動自在に密接するシールリップ７と、シールリップ７の外周側に配置されるとともに固定部６に一体的に設けられ、カップ３に摺動自在に密接するダストリップ８とが設けられている（特許文献１参照）。   As shown in an enlarged view in FIG. 4, the universal joint seal 5 has a fixed portion 6 fixed to the spider 2, and a seal lip that is provided integrally with the fixed portion 6 and slidably contacts the cup 3. 7 and a dust lip 8 disposed on the outer peripheral side of the seal lip 7 and provided integrally with the fixed portion 6 and slidably in close contact with the cup 3 (see Patent Document 1).

上記構成の自在継手用シール５において、シールリップ７とダストリップ８の間には密閉状の空間９が形成されるが、この空間９内の圧力（以下、内圧とも称する）が摺動作動や温度変化等により変化し、内圧の上昇によりグリースが漏れたり、内圧の低下により泥水が浸入したりする虞がある（減圧により泥水を呼び込みやすくなる）。内圧の変化に対応するには、ダストリップ８の剛性を上げたり、しめしろを大きくしたりする対策があるが、これらによると、摺動トルクや摺動発熱が大きくなる不都合がある。   In the universal joint seal 5 having the above-described configuration, a sealed space 9 is formed between the seal lip 7 and the dust lip 8, and the pressure in the space 9 (hereinafter also referred to as internal pressure) There is a risk of grease leaking due to an increase in internal pressure, or intrusion of muddy water due to a decrease in internal pressure (which makes it easier to attract muddy water due to reduced pressure). In order to cope with the change in internal pressure, there are measures to increase the rigidity of the dust lip 8 or increase the interference, but these have the disadvantage of increasing the sliding torque and sliding heat generation.

特開２０００−１１０８４６号公報JP 2000-110846 A

本発明は以上の点に鑑みて、シールリップおよびダストリップ間の空間の内圧が変化してもシール性を維持することができ、しかも摺動トルクや摺動発熱が大きくなることもない自在継手用シールを提供することを目的とする。 In view of the above, the present invention provides a universal joint that can maintain sealing performance even if the internal pressure of the space between the seal lip and the dust lip changes, and that does not increase sliding torque or sliding heat generation. The purpose is to provide a seal for the use.

上記目的を達成するため、本発明の自在継手用シールは、スパイダー、前記スパイダーの端部外周を取り囲むカップおよび前記スパイダーとカップの間に介装されるベアリングを有する自在継手に用いられるシールであって、前記スパイダーに固定される固定部と、前記固定部に一体的に設けられ、前記カップに摺動自在に密接するシールリップと、前記シールリップの外周側に配置されるとともに前記固定部に一体的に設けられ、前記カップに摺動自在に密接するダストリップとを有し、前記両リップ間の空間の内圧が変化したときにこれを吸収する窪み状または溝状の内圧変化吸収部が前記両リップ間の空間の底部に設けられ、前記内圧変化吸収部の径方向幅は、前記両リップ間の空間の底面の径方向幅よりも小さく設定されていることを特徴とするものである。 In order to achieve the above object, the universal joint seal of the present invention is a seal used for a universal joint having a spider, a cup surrounding the outer periphery of the end of the spider, and a bearing interposed between the spider and the cup. A fixed portion fixed to the spider, a seal lip provided integrally with the fixed portion and slidably in contact with the cup, and disposed on the outer peripheral side of the seal lip and on the fixed portion A dust strip that is provided integrally and slidably in close contact with the cup, and has a hollow or groove-shaped internal pressure change absorbing portion that absorbs when the internal pressure of the space between the two lips changes. provided at the bottom of the space between the two lips, the radial width of the pressure change absorbing portion, that is smaller than the radial width of the bottom surface of the space between the two lips It is an feature.

上記構成を有する本発明の自在継手用シールにおいては、シールリップおよびダストリップ間の空間の底部（空間底面）に窪み状または溝状の内圧変化吸収部が設けられているために、この窪みまたは溝の分、両リップ間の空間の容積が増大されている。したがってリップ形状を変更することなく両リップ間の空間の容積を増大することにより内圧変動を緩和することが可能とされている。 In the universal joint seal of the present invention having the above-described configuration, a recess or groove-shaped internal pressure change absorbing portion is provided at the bottom (space bottom) of the space between the seal lip and the dust lip. The volume of the space between both lips is increased by the amount of the groove. Therefore, it is possible to mitigate internal pressure fluctuations by increasing the volume of the space between both lips without changing the lip shape.

本発明は、以下の効果を奏する。   The present invention has the following effects.

すなわち、本発明によれば上記したようにシールリップおよびダストリップ間の空間の底部に窪み状または溝状の内圧変化吸収部が設けられ、両リップ間の空間の容積が増大されて内圧変動を緩和することが可能とされているために、内圧の上昇によるグリースの漏れおよび内圧の低下による泥水の浸入を抑制することができる。また、リップの形状を変更するものでなく、内圧変化吸収部が設けられてもその径方向幅が両リップ間の空間の底面の径方向幅より小さく設定されて内圧変化吸収部を設けたことが両リップに影響しないようにされているため、リップの摺動トルクや摺動発熱が大きくなると云う不都合が生じることもない。したがって本発明初期の目的どおり、シールリップおよびダストリップ間の空間の内圧が変化してもシール性を維持することができ、しかも摺動トルクや摺動発熱が大きくなることもない自在継手用シールを提供することができる。 That is, according to the present invention, as described above, a hollow or groove-shaped internal pressure change absorbing portion is provided at the bottom of the space between the seal lip and the dust lip, and the volume of the space between both lips is increased to reduce the internal pressure fluctuation. Since it is possible to mitigate, leakage of grease due to an increase in internal pressure and infiltration of muddy water due to a decrease in internal pressure can be suppressed. In addition, the shape of the lip was not changed, and even if the internal pressure change absorption part was provided, the radial width was set smaller than the radial width of the bottom surface of the space between the two lips and the internal pressure change absorption part was provided. There has been marked as not to affect both lips, it does not cause inconvenience to say sliding torque and sliding heat generation of the lip increases. Therefore, as in the initial purpose of the present invention, the seal for the universal joint can maintain the sealing performance even if the internal pressure of the space between the seal lip and the dust lip changes, and does not increase the sliding torque and the sliding heat generation. Can be provided.

本発明には、以下の実施形態が含まれる。
（１）プロペラシャフトシール、ユニバーサルジョイントシールに適用するジョイントシールにおいて、ダストリップ／グリースリップ間に窪み（等配溝）または溝（円周溝）を設定する。リップ間に窪みや溝を設けることで、リップ形状は変えずに空間容積を広げて内圧変動を緩和する。内圧変動の緩和により、正圧によるグリース漏れ、負圧による泥水侵入を抑制することができる。
（２）リップの変形に影響の小さい外周リップ間の底部に窪みまたは溝を設け、その容積を大きくする。これにより、内外周リップ間にグリースが満たされず空間ができるので、熱膨張による圧力上昇を緩和できる。空気は圧縮性流体のため、グリースに比べ、熱膨張による圧力上昇は小さい。 The present invention includes the following embodiments.
(1) In joint seals applied to propeller shaft seals and universal joint seals, recesses (equal grooves) or grooves (circumferential grooves) are set between the dust strip / grease lip. By providing a recess or groove between the lips, the space volume is expanded without changing the lip shape, and the internal pressure fluctuation is alleviated. By mitigating internal pressure fluctuations, grease leakage due to positive pressure and muddy water intrusion due to negative pressure can be suppressed.
(2) A recess or groove is provided at the bottom between the outer peripheral lips, which has little influence on the deformation of the lip, and its volume is increased. As a result, grease is not filled between the inner and outer peripheral lips, and a space is created, so that an increase in pressure due to thermal expansion can be mitigated. Since air is a compressible fluid, the pressure rise due to thermal expansion is small compared to grease.

つぎに本発明の実施例を図面にしたがって説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の実施例に係る自在継手用シール５の要部断面を示している。図の右側が内周側、左側が外周側である。当該実施例に係る自在継手用シール５は、自動車等車両におけるステアリングジョイントやプロペラシャフト等に使用する自在継手にユニバーサルジョイントシールまたはプロペラシャフトシール等として用いられる。自在継手には、スパイダー２と、スパイダー２の端部外周側を取り囲むカップ３と、スパイダー２およびカップ３の間に介装されるベアリング（ニードルベアリング）４とが設けられ、継手内部のグリースおよび外部の泥水等のダストをシールすべく自在継手用シール（ジョイントシール）５が設けられている。   FIG. 1 shows a cross section of a main part of a universal joint seal 5 according to an embodiment of the present invention. The right side of the figure is the inner peripheral side, and the left side is the outer peripheral side. The universal joint seal 5 according to this embodiment is used as a universal joint seal or a propeller shaft seal for a universal joint used for a steering joint, a propeller shaft, or the like in a vehicle such as an automobile. The universal joint is provided with a spider 2, a cup 3 surrounding the outer peripheral side of the end of the spider 2, and a bearing (needle bearing) 4 interposed between the spider 2 and the cup 3. A universal joint seal (joint seal) 5 is provided to seal dust such as external muddy water.

自在継手用シール５には、スパイダー２の環状段部２ａに固定（嵌合）される環状の固定部６と、固定部６に上方へ向けて一体に成形され、カップ３に摺動自在に密接するシールリップ（グリースリップ）７と、シールリップ７の外周側に配置されるとともに固定部６に上方へ向けて一体に成形され、カップ３に摺動自在に密接するダストリップ８とが設けられている。固定部６には断面Ｕ字形の補強環１０が埋設されている。   The universal joint seal 5 is formed integrally with the annular fixing portion 6 fixed (fitted) to the annular step portion 2a of the spider 2 and the fixing portion 6 so as to be slidable on the cup 3. A close seal lip (grease lip) 7 and a dust lip 8 disposed on the outer peripheral side of the seal lip 7 and integrally formed upward with the fixed portion 6 and slidably close to the cup 3 are provided. It has been. A reinforcing ring 10 having a U-shaped cross section is embedded in the fixed portion 6.

また、この自在継手用シール５は、補強環１０を埋設したゴム状弾性体１１よりなるものであって、このゴム状弾性体１１によって、固定部６、シールリップ７およびダストリップ８が一体に成形されている。   The universal joint seal 5 includes a rubber-like elastic body 11 in which a reinforcing ring 10 is embedded. The rubber-like elastic body 11 allows the fixing portion 6, the seal lip 7, and the dust lip 8 to be integrated. Molded.

内周側のシールリップ７は、固定部６の上面内周部から上方へ向けて一体成形され、カップ３の筒状部３ａ下端に設けた内向きフランジ部３ｂの下面に密接して主にグリースをシールする。一方、外周側のダストリップ８は、固定部６の上面外周部から上方へ向けて一体成形され、カップ３の筒状部３ａの外周面に密接して主に泥水等のダストをシールする。シールリップ７およびダストリップ８の間には、環状を呈する密閉状の空間９が設けられることになる。   The seal lip 7 on the inner peripheral side is integrally formed upward from the inner peripheral portion of the upper surface of the fixed portion 6 and mainly in close contact with the lower surface of the inward flange portion 3b provided at the lower end of the cylindrical portion 3a of the cup 3. Seal the grease. On the other hand, the dust lip 8 on the outer peripheral side is integrally formed upward from the outer peripheral portion of the upper surface of the fixed portion 6 and is in close contact with the outer peripheral surface of the cylindrical portion 3a of the cup 3 to mainly seal dust such as muddy water. Between the seal lip 7 and the dust lip 8, a sealed space 9 having an annular shape is provided.

更に、シールリップ７およびダストリップ８間の底部であって前記空間９の底面に、両リップ７，８間の内圧が変化したときにこれを吸収するための窪み状を呈する内圧変化吸収部１２が全周に亙って設けられている。窪みは多数が円周上に並んで形成されており、窪みの径方向幅ｄ１は両リップ７，８の根元部間の径方向間隔すなわち空間９底面の径方向幅ｄ２よりも小さく設定されている（ｄ１＜ｄ２）。 Furthermore, an internal pressure change absorbing portion 12 which is a bottom portion between the seal lip 7 and the dust lip 8 and has a hollow shape for absorbing the internal pressure between the lips 7 and 8 when the internal pressure between the lips 7 and 8 changes on the bottom surface of the space 9. Is provided all around. A number of the depressions are formed side by side on the circumference, and the radial width d 1 of the depression is set smaller than the radial interval between the root portions of both lips 7, 8, that is, the radial width d 2 of the bottom surface of the space 9. (D 1 <d 2 ).

上記構成を有する自在継手用シール５においては、シールリップ７およびダストリップ８間の底部であって両リップ７，８間の空間９の底面に位置して窪み状の内圧変化吸収部１２が設けられているために、両リップ７，８間の空間９の容積が窪み状の内圧変化吸収部１２が設けられていないものと比較して増大されている。したがって空間９内の内圧変動を大きな容積で緩和することができることから、内圧の上昇によるグリースの漏れおよび内圧の低下による泥水の浸入等のシール漏れを抑制することができる。また、両リップ７，８の形状は従来と比較して同じ形状とされ、空間９底面に窪み状の内圧変化吸収部１２が設けられてもその径方向幅ｄ１は空間９底面の径方向幅ｄ２より小さく設定されて内圧変化吸収部１２を設けたことが両リップ７，８に影響しないようにされているため、両リップ７，８に摺動トルクや摺動発熱が大きくなると云った不都合を生じることもない。したがって両リップ７，８間の内圧が変化してもシール性を維持することができ、しかも摺動トルクや摺動発熱が大きくなることもない自在継手用シール５を提供することができる。 In the universal joint seal 5 having the above-described configuration, a concave internal pressure change absorbing portion 12 is provided at the bottom between the seal lip 7 and the dust lip 8 and at the bottom of the space 9 between the lips 7 and 8. For this reason, the volume of the space 9 between the lips 7 and 8 is increased as compared with the case where the hollow internal pressure change absorbing portion 12 is not provided. Therefore, since the internal pressure fluctuation in the space 9 can be relaxed with a large volume, it is possible to suppress leakage of grease due to an increase in internal pressure and seal leakage such as intrusion of muddy water due to a decrease in internal pressure. Further, the shape of both lips 7 and 8 is the same as that of the prior art, and even if a hollow internal pressure change absorbing portion 12 is provided on the bottom surface of the space 9, the radial width d 1 is the radial direction of the bottom surface of the space 9. Since the internal pressure change absorbing portion 12 is set to be smaller than the width d 2 so as not to affect both the lips 7, 8, the sliding torque and the sliding heat generation are increased in both the lips 7, 8. There will be no inconvenience. Therefore, it is possible to provide the universal joint seal 5 that can maintain the sealing performance even if the internal pressure between the lips 7 and 8 changes, and that does not increase the sliding torque and the sliding heat generation.

内圧変化吸収部１２の形状については、その機能を果たすかぎり、様々なものが考えられる。上記実施例では、多数が円周上に並べられた窪みとされたが、これに代えて例えば、全周に亙る円周溝（環状溝）であっても良く、図２の他の例では、円周溝が３本同心状に形成されている。   Various shapes of the internal pressure change absorbing portion 12 are conceivable as long as they fulfill their functions. In the above embodiment, the depressions are arranged in a large number on the circumference. However, instead of this, for example, a circumferential groove (annular groove) extending over the entire circumference may be used. In another example of FIG. Three circumferential grooves are formed concentrically.

本発明の実施例に係る自在継手用シールの要部断面図Sectional drawing of the principal part of the universal joint seal which concerns on the Example of this invention. 本発明の他の実施例に係る自在継手用シールの要部断面図Sectional drawing of the principal part of the universal joint seal which concerns on the other Example of this invention. 自在継手の説明図Illustration of universal joint 従来例に係る自在継手用シールの断面図Sectional view of a universal joint seal according to a conventional example

符号の説明Explanation of symbols

１ 自在継手
２ スパイダー
３ カップ
３ａ 筒状部
３ｂ フランジ部
４ ベアリング
５ 自在継手用シール
６ 固定部
７ シールリップ
８ ダストリップ
９ 空間
１０ 補強環
１１ ゴム状弾性体
１２ 内圧変化吸収部 DESCRIPTION OF SYMBOLS 1 Universal joint 2 Spider 3 Cup 3a Cylindrical part 3b Flange part 4 Bearing 5 Universal joint seal 6 Fixed part 7 Seal lip 8 Dustrip 9 Space 10 Reinforcement ring 11 Rubber-like elastic body 12 Internal pressure change absorption part

Claims (1)

スパイダー、前記スパイダーの端部外周を取り囲むカップおよび前記スパイダーとカップの間に介装されるベアリングを有する自在継手に用いられるシールであって、
前記スパイダーに固定される固定部と、前記固定部に一体的に設けられ、前記カップに摺動自在に密接するシールリップと、前記シールリップの外周側に配置されるとともに前記固定部に一体的に設けられ、前記カップに摺動自在に密接するダストリップとを有し、
前記両リップ間の空間の内圧が変化したときにこれを吸収する窪み状または溝状の内圧変化吸収部が前記両リップ間の空間の底部に設けられ、
前記内圧変化吸収部の径方向幅は、前記両リップ間の空間の底面の径方向幅よりも小さく設定されていることを特徴とする自在継手用シール。 A seal used for a universal joint having a spider, a cup surrounding an outer periphery of an end of the spider, and a bearing interposed between the spider and the cup,
A fixing portion fixed to the spider; a seal lip provided integrally with the fixing portion and slidably in contact with the cup; and disposed on an outer peripheral side of the seal lip and integrated with the fixing portion A dust lip slidably in close contact with the cup,
The recess-shaped or groove-shaped pressure change absorbing portion absorbs this when the internal pressure of the space has changed between the two lips are provided at the bottom of the space between the two lips,
The universal joint seal according to claim 1, wherein a radial width of the internal pressure change absorbing portion is set smaller than a radial width of a bottom surface of a space between the lips .
JP2008105545A 2008-04-15 2008-04-15 Universal joint seal Active JP5288105B2 (en)

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JP5978647B2 (en) * 2012-02-23 2016-08-24 日本精工株式会社 Cross shaft type universal joint

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JPS62151629A (en) * 1985-12-25 1987-07-06 Nippon Seiko Kk Thrust receiving device serving as seal for bearing for cross joint

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