JP2006123820A - Telescopic shaft for vehicle steering - Google Patents

Telescopic shaft for vehicle steering Download PDF

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Publication number
JP2006123820A
JP2006123820A JP2004316963A JP2004316963A JP2006123820A JP 2006123820 A JP2006123820 A JP 2006123820A JP 2004316963 A JP2004316963 A JP 2004316963A JP 2004316963 A JP2004316963 A JP 2004316963A JP 2006123820 A JP2006123820 A JP 2006123820A
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Prior art keywords
shaft
spline shaft
vehicle steering
group
grease
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Hirotoshi Miyajima
裕俊 宮島
Toshiyuki Iwano
敏行 岩野
Hiromichi Komori
宏道 小森
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NSK Ltd
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NSK Ltd
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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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F16C3/03—Shafts; Axles telescopic
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles
    • F16C2326/24—Steering systems, e.g. steering rods or columns

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Steering Controls (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Lubricants (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telescopic shaft for a vehicle steering in which a sliding resistance is reduced, a stable sliding load is realized, an anti-wearing characteristic is improved and looseness of the shaft is positively prevented. <P>SOLUTION: This telescopic shaft for a vehicle steering is assembled into a steering shaft of a vehicle and both a male spline shaft and a female spline shaft are fitted to each other in such a way that they may not be rotated but slidable. This is characterized in that the surface of spline fitted part of one of the male spline shaft and female spline shaft is coated with a film of nylon resin, grease containing poly-α-olefin acting as base oil and lithium soap acting as thickening agent is placed between the male spline shaft and female spline shaft, and grease has a kinematic viscosity of 20 mm<SP>2</SP>/s or more at 40°C. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、摺動抵抗を低減して安定した摺動荷重を実現すると共に、耐摩耗性を向上してガタ付きを確実に防止した車両ステアリング用伸縮軸に関する。   The present invention relates to a telescopic shaft for vehicle steering that realizes a stable sliding load by reducing sliding resistance and that has improved wear resistance and reliably prevents rattling.

図３に、一般的な自動車の操舵機構部を示す。図中のａとｂが伸縮軸である。伸縮軸ａは、雄スプライン軸と雌スプライン軸をスプライン嵌合したものであるが、このような伸縮軸ａには自動車が走行する際に発生する軸方向の変位を吸収し、ステアリングホイール上にその変位や振動を伝えない性能が要求される。このような性能は、車体がサブフレーム構造となっていて、操舵機構上部を固定する部位ｃとステアリングラックｄが固定されているフレームｅが別体となっており、その間がゴムなどの弾性体ｆを介して締結固定されている構造の場合に要求されることが一般的である。また、その他のケースとして操舵軸継手ｇをピニオンシャフトｈに締結する際に作業者が、伸縮軸をいったん縮めてからピニオンシャフトｈに嵌合させ締結させるため伸縮機能が必要とされる場合がある。さらに、操舵機構の上部にある伸縮軸ｂも、雄スプライン軸と雌スプライン軸をスプライン嵌合したものであるが、このような伸縮軸ｂには、運転者が自動車を運転するのに最適なポジションを得るためにステアリングホイールｉの位置を軸方向に移動し、その位置を調整する機能が要求されるため、軸方向に伸縮する機能が要求される。前述のすべての場合において、伸縮軸にはスプライン部のガタ音を低減することと、ステアリングホイール上のガタ感を低減することと、軸方向摺動動作時における摺動抵抗を低減することとが要求される。   FIG. 3 shows a general automobile steering mechanism. In the drawing, a and b are telescopic axes. The telescopic shaft a is a spline-fitting of a male spline shaft and a female spline shaft. The telescopic shaft a absorbs axial displacement generated when the vehicle travels, and is placed on the steering wheel. Performance that does not transmit the displacement and vibration is required. In such a performance, the vehicle body has a sub-frame structure, and the part c for fixing the upper part of the steering mechanism and the frame e to which the steering rack d is fixed are separated, and an elastic body such as rubber between them. It is generally required in the case of a structure that is fastened and fixed via f. As another case, when the steering shaft joint g is fastened to the pinion shaft h, an operator may need to have a telescopic function so that the telescopic shaft is once contracted and then fitted and fastened to the pinion shaft h. . Further, the telescopic shaft b at the upper part of the steering mechanism is a spline-fitting of the male spline shaft and the female spline shaft. The telescopic shaft b is optimal for the driver to drive the automobile. In order to obtain the position, the function of moving the position of the steering wheel i in the axial direction and adjusting the position is required, so the function of expanding and contracting in the axial direction is required. In all the cases described above, it is possible to reduce the rattling noise of the spline portion on the telescopic shaft, to reduce the rattling on the steering wheel, and to reduce the sliding resistance during the axial sliding operation. Required.

従来、伸縮軸ａ、ｂの雄スプライン軸のスプライン部に対して、ナイロン膜をコーティングし、さらに摺動部にグリースを塗布し、金属騒音、金属打音等を吸収または緩和すると共に摺動抵抗の低減と回転方向ガタの低減とを行ってきた。この場合、ナイロン膜を形成する工程としてはシャフトの洗浄→プライマー塗布→加熱→ナイロン粉末コート→粗切削→仕上げ切削→スプライン雌軸との選択嵌合が行われている。最終の切削加工は、既に加工済みのスプライン雌軸の加工精度に合わせてダイスを選択して加工を行う。伸縮軸の摺動荷重を最小に抑えつつガタをも最小に抑えることが必要である為、最終の切削加工では数ミクロンずつオーバーピン径サイズの異なるダイスを雌スプライン軸にあわせて選び出し加工することを余儀なくされ、加工コストの高騰を招来してしまう。また、使用経過によりナイロン膜の摩耗が進展して回転方向ガタが大きくなる。   Conventionally, the spline part of the male spline shaft of the telescopic shafts a and b is coated with a nylon film, and grease is applied to the sliding part to absorb or reduce metal noise, metal hitting sound, etc., and sliding resistance Have been reduced and the play in the rotational direction has been reduced. In this case, as a process of forming the nylon film, the shaft is washed → primer applied → heated → nylon powder coating → rough cutting → finish cutting → selective fitting with the spline female shaft. The final cutting is performed by selecting a die in accordance with the processing accuracy of the spline female shaft that has already been processed. Since it is necessary to minimize the backlash while minimizing the sliding load on the telescopic shaft, it is necessary to select and process dies with different overpin diameters by several microns in accordance with the female spline shaft in the final cutting process. Will be forced to increase the processing cost. Further, wear of the nylon film progresses with the progress of use, and the rotational play is increased.

したがって、自動車用操舵軸に使用される伸縮軸において、回転方向ガタによる異音の発生と操舵感の悪化を長期に渡って抑制できる構造を簡単かつ安価に提供したいといった要望がある。   Therefore, there is a demand to provide a structure that can suppress generation of noise due to backlash in the rotational direction and deterioration of steering feeling over a long period of time in a telescopic shaft used for an automobile steering shaft, simply and inexpensively.

このような要望に沿った改善策として、前述のようなナイロン膜の代わりに、雄スプライン軸及び雌スプライン軸の少なくともいずれか一方のスプライン部に二硫化モリブデンを含む薄膜を形成して、両者間の摺動抵抗を低減しつつ、ガタ付きを防止している（例えば、特許文献１参照）。しかしながら、上記改善策では、二硫化モリブデンを含む薄膜を形成する工程以前の雄スプライン軸と雌スプライン軸の加工精度管理を従来のナイロン皮膜を使ったものより厳しくしなければならない。
特開２０００−９１４８号公報 As an improvement measure in line with such a demand, instead of the nylon film as described above, a thin film containing molybdenum disulfide is formed on at least one of the male spline shaft and the female spline shaft, and the gap between the two. The sliding resistance is reduced while the backlash is prevented (see, for example, Patent Document 1). However, in the above improvement measures, the processing accuracy control of the male spline shaft and the female spline shaft before the process of forming the thin film containing molybdenum disulfide must be made stricter than that using the conventional nylon film.
JP 2000-9148 A

本発明は、上述したような事情に鑑みてなされたものであって、摺動抵抗を低減して安定した摺動荷重を実現すると共に、耐摩耗性を向上してガタ付きを確実に防止した車両ステアリング用伸縮軸を提供することを目的とする。   The present invention has been made in view of the above-described circumstances, and realizes a stable sliding load by reducing sliding resistance, and improves wear resistance and reliably prevents rattling. An object is to provide a telescopic shaft for vehicle steering.

上記の目的を達成するため、本発明に係る車両ステアリング用伸縮軸は、車両のステアリングシャフトに組込み、雄スプライン軸と雌スプライン軸を回転不能に且つ摺動自在に嵌合した車両ステアリング用伸縮軸において、前記雄スプライン軸と雌スプライン軸のいずれか一方又は双方の軸のスプライン嵌合部表面にナイロン樹脂の皮膜を形成し、且つ、少なくとも基油と増ちょう剤を含むグリースを前記雄スプライン軸と雌スプライン軸の間に介在させ、前記基油が合成炭化水素油と鉱油からなる群から選択される少なくとも１種の炭化水素油を含むと共に４０℃において２０ｍｍ2／ｓ以上の動粘度を有し、前記増ちょう剤が金属石けん又は金属複合石けんを含むことを特徴とする。 In order to achieve the above object, a telescopic shaft for vehicle steering according to the present invention is incorporated in a steering shaft of a vehicle, and a telescopic shaft for vehicle steering in which a male spline shaft and a female spline shaft are non-rotatably and slidably fitted. In this case, the male spline shaft is formed with a nylon resin film on the surface of the spline fitting portion of one or both of the male spline shaft and the female spline shaft, and grease containing at least a base oil and a thickener is added to the male spline shaft. The base oil contains at least one hydrocarbon oil selected from the group consisting of synthetic hydrocarbon oils and mineral oils, and has a kinematic viscosity of 20 mm 2 / s or more at 40 ° C. The thickener contains metal soap or metal composite soap.

本発明において、雄スプライン軸と雌スプライン軸の嵌合部表面のナイロン樹脂の皮膜は、摺動部の摩擦低減の観点で、どちらか一方の軸のスプライン嵌合部表面に形成せしめることが好ましい。   In the present invention, the nylon resin film on the surface of the fitting portion of the male spline shaft and the female spline shaft is preferably formed on the surface of the spline fitting portion of one of the shafts from the viewpoint of reducing the friction of the sliding portion. .

雄スプライン軸と雌スプライン軸の摺動時に発生する摩擦カに及ぼす要因につき考察する。 図４の左側の図に示すように、摺動する両方のスプライン軸のスプライン嵌合部面にナイロン樹脂の皮膜が形成されていると、ナイロン樹脂のアミド結合の極性に由来して、両方のスプライン軸のスプライン嵌合部表面の間に電気的な作用が生じ、摩擦が大きくなってしまう。一方、図４の右側の図に示すように、摺動する両方のスプライン軸のスプライン嵌合部表面の片側の面を金属にした場合、ナイロン樹脂のアミド結合間の相互干渉が回避されるため、摩擦力が小さくなり、摺動が滑らかになる。   The factors affecting the frictional force generated when the male and female spline shafts slide are discussed. As shown in the diagram on the left side of FIG. 4, when a nylon resin film is formed on the spline fitting surface of both sliding spline shafts, both are derived from the polarity of the amide bond of the nylon resin. An electric action is generated between the surfaces of the spline fitting portion of the spline shaft, and friction is increased. On the other hand, as shown in the diagram on the right side of FIG. 4, when one surface of the spline fitting portion surface of both sliding spline shafts is made of metal, mutual interference between amide bonds of nylon resin is avoided. , The frictional force becomes small and the sliding becomes smooth.

摺動時の摩擦カに及ぼす別の要因として、スプライン嵌合部の表面粗さが挙げられる。本発明において、摺動する両方のスプライン軸のスプライン嵌合部表面の片側の面を金属にした場合、摺動部の金属側の表面粗さが最大高さＲｙで１３μｍ以下であれば好適に使用できることを発見した。Ｒｙが１０μｍ以下であればより好ましく、８μｍ以下が最適条件である。   Another factor affecting the frictional force during sliding is the surface roughness of the spline fitting portion. In the present invention, when one side of the surface of the spline fitting portion of both sliding spline shafts is made of metal, the surface roughness on the metal side of the sliding portion is preferably 13 μm or less at the maximum height Ry. I found it usable. Ry is more preferably 10 μm or less, and 8 μm or less is the optimum condition.

本発明の基油は、合成炭化水素油と鉱油からなる群から選択される少なくとも１種の炭化水素油を必須成分として含有し、必要に応じて他の種類の油を混合する。合成炭化水素油は、例えばポリα‐オレフィン（以下、ＰＡＯとも云う。）を用いる。これらは、極性が小さくナイロン樹脂に対する、膨張、強度低下等の悪影響が少ない。但し、本発明においては、耐油性の強いナイロン樹脂を皮膜に用いているので、ナイロン樹脂に対する基油の濡れ性を改善する等の目的で、エステル油やアルキルジフェニルエ一テル油等の極性を有する潤滑油を少量基油に混合しても構わない。その場合、合成炭化水素油と鉱油からなる群から選択される少なくとも１種の炭化水素油の基油全量に対する含有量が７０重量％以上であれば、ナイロン樹脂皮膜に対する致命的な影響を何ら有することなく、好適に使用できる。本発明の基油は、動粘度が４０℃において２０ｍｍ2／ｓ以上である。基油の動粘度が４０℃において２０ｍｍ2／ｓ未満であると摩擦係数が上昇し、耐久性が劣化する。 The base oil of the present invention contains at least one hydrocarbon oil selected from the group consisting of synthetic hydrocarbon oils and mineral oils as an essential component, and other types of oils are mixed as necessary. For example, poly α-olefin (hereinafter also referred to as PAO) is used as the synthetic hydrocarbon oil. These are small in polarity and have little adverse effects such as expansion and strength reduction on the nylon resin. However, in the present invention, a highly oil-resistant nylon resin is used for the film, so that the polarity of ester oil or alkyldiphenyl ether oil or the like is improved for the purpose of improving the wettability of the base oil to the nylon resin. A small amount of the lubricating oil may be mixed with the base oil. In that case, if the content of the at least one hydrocarbon oil selected from the group consisting of synthetic hydrocarbon oil and mineral oil with respect to the total amount of the base oil is 70% by weight or more, it has any fatal effect on the nylon resin film. It can use suitably, without. The base oil of the present invention has a kinematic viscosity of 20 mm 2 / s or more at 40 ° C. When the kinematic viscosity of the base oil is less than 20 mm 2 / s at 40 ° C., the friction coefficient increases and the durability deteriorates.

本発明の増ちょう剤の金属石けん又は金属複合石けんは、図５に示すように、図５の下部に示すナイロン樹脂表面のアミド結合と上部に示す金属石けん又は金属複合石けんの極性基の極性とに由来する電気的な弱結合を形成し、ナイロン樹脂表面に金属石けん又は金属複合石けんのアルキル鎖、例えばＣＨ3（ＣＨ2）16−、ＣＨ3（ＣＨ2）5ＣＨ（ＯＨ）（ＣＨ2）10−等を主体とする金属石けん又は金属複合石けんの皮膜を形成する。また金属表面にも増ちょう剤としての金属石けんが吸着し、同様にアルキル鎖を主体とする金属石けんの皮膜を形成する。これらのアルキル鎖を主体とする金属石けん又は金属複合石けんの皮膜は表面エネルギーが小さく低摩擦である。また、この皮膜形成の結果ナイロン樹脂に対する炭化水素油等の基油の濡れ性が改善し、油膜の形成が強固となる。以上説明したように、油膜の強度を増し、また、例え油膜が破断した場合においても、アルキル鎖長を主たる構成要素とする、低摩擦の金属石けん又は金属複合石けんの皮膜を介することによって、雄軸と雌軸の間の直接接触による摩擦の増大を回避する。 As shown in FIG. 5, the thickening agent metal soap or metal composite soap of the present invention has an amide bond on the surface of the nylon resin shown at the bottom of FIG. 5 and the polarity of the polar group of the metal soap or metal composite soap shown at the top. Weakly bonded to the surface of the nylon resin, and an alkyl chain of metal soap or metal composite soap such as CH 3 (CH 2 ) 16 —, CH 3 (CH 2 ) 5 CH (OH) (CH 2 ) Form a film of metal soap or metal composite soap mainly composed of 10- etc. Also, metal soap as a thickener is adsorbed on the metal surface, and similarly, a metal soap film mainly composed of alkyl chains is formed. The metal soap or metal composite soap film mainly composed of these alkyl chains has low surface energy and low friction. In addition, as a result of this film formation, the wettability of a base oil such as hydrocarbon oil with respect to the nylon resin is improved, and the formation of the oil film is strengthened. As described above, the strength of the oil film is increased, and even when the oil film is broken, the male chain is formed by a low-friction metal soap or metal composite soap film having an alkyl chain length as a main component. Avoid increased friction due to direct contact between shaft and female shaft.

本発明の金属石けん又は金属複合石けんの金属元素の種類は任意であるが、リチウム、亜鉛、カルシウム、バリウム、アルミニウム等が特に好ましい。金属石けん又は金属複合石けんの脂肪酸基、特に高級脂肪酸基の種類は任意であるが、ステアリン酸、１２−ヒドロキシステアリン酸、アゼライン酸が特に好ましい。   The kind of metal element of the metal soap or metal composite soap of the present invention is arbitrary, but lithium, zinc, calcium, barium, aluminum and the like are particularly preferable. The type of the fatty acid group, particularly the higher fatty acid group of the metal soap or metal complex soap is arbitrary, but stearic acid, 12-hydroxystearic acid, and azelaic acid are particularly preferable.

以下、本発明の一実施形態に係る車両ステアリング用伸縮軸を、図面を参照しつつ説明する。   Hereinafter, a telescopic shaft for vehicle steering according to an embodiment of the present invention will be described with reference to the drawings.

図１は、本発明の一実施形態に係る車両ステアリング用伸縮軸の分解斜視図である。図２（ａ）は、図１に示した車両ステアリング用伸縮軸の雄スプライン軸の横断面図であり、図２（ｂ）は、同伸縮軸の雌スプライン軸の横断面図である。   FIG. 1 is an exploded perspective view of a telescopic shaft for vehicle steering according to an embodiment of the present invention. 2A is a cross-sectional view of the male spline shaft of the vehicle steering telescopic shaft shown in FIG. 1, and FIG. 2B is a cross-sectional view of the female spline shaft of the telescopic shaft.

図１及び図２に示すように、車両ステアリング用伸縮軸は、相互にスプライン嵌合した雄スプライン軸１と雌スプライン軸２とからなる。雄スプライン軸１のスプライン部表面と雌スプライン軸２のスプライン部表面の何れか一方には、ナイロン樹脂の皮膜３ａ、又は３ｂが形成している。   As shown in FIGS. 1 and 2, the vehicle steering telescopic shaft includes a male spline shaft 1 and a female spline shaft 2 that are spline-fitted with each other. A nylon resin coating 3a or 3b is formed on either the surface of the spline portion of the male spline shaft 1 or the surface of the spline portion of the female spline shaft 2.

この皮膜３ａ、３ｂは、例えば、１０〜１０００μｍの範囲で適宜に設定される。   The coatings 3a and 3b are appropriately set within a range of 10 to 1000 μm, for example.

以上説明したように、本発明によれば、雄スプライン軸と雌スプライン軸のいずれか一方の軸の又は双方の軸のスプライン嵌合部表面に、ナイロン樹脂の皮膜が形成してあり、且つ、摩擦低減能に優れたグリースを雄スプライン軸と雌スプライン軸の間に介在させ、且つ、雄スプライン軸及び雌スプライン軸の形状を低摺動、高耐久性の観点から最適化しているために、ガタ付きを長期間防止し、しかも低摩擦で摺動できるスプライン構造を実現できる。   As described above, according to the present invention, a nylon resin film is formed on the surface of the spline fitting portion of either one of the male spline shaft and the female spline shaft or both shafts, and Because grease excellent in friction reducing ability is interposed between the male spline shaft and the female spline shaft, and the shape of the male spline shaft and the female spline shaft is optimized from the viewpoint of low sliding and high durability, A spline structure that can prevent backlash for a long time and can slide with low friction can be realized.

本発明において、雄スプライン軸と雌スプライン軸のスプライン嵌合部表面のナイロン樹脂の皮膜は、摺動部の摩擦低減、加工上の手間、及びコストを考慮すると、雄スプライン軸の表面にのみ形成することがより好ましい。   In the present invention, the nylon resin film on the surface of the spline fitting portion of the male spline shaft and the female spline shaft is formed only on the surface of the male spline shaft in consideration of friction reduction of the sliding portion, processing effort, and cost. More preferably.

増ちょう剤の配合量は、前記した機能を考慮すれば、ある程度多めにすることが好ましいが、そのためにグリースが硬化しすぎると取り扱いが難しくなる。したがって、金属石けん又は金属複合石けんを含む増ちょう剤の機能を補填するために油溶性の油性剤をグリース中に配合しておくことは有効な措置である。但し、油性剤の類はナイロン樹脂に対して膨潤、強度低下等の悪影響を及ぼすことがあるので、その選定には慎重を期さねばならない。   In consideration of the above-described functions, it is preferable to increase the amount of the thickener to some extent. However, if the grease is hardened too much, handling becomes difficult. Therefore, it is an effective measure to add an oil-soluble oily agent to the grease in order to compensate for the function of the thickener containing metal soap or metal composite soap. However, since oily agents may adversely affect the nylon resin such as swelling and strength reduction, it must be carefully selected.

本発明者は、油性剤として、一般式ＲＳＯ3Ｍで示されるスルフォン酸塩を含み、式中、Ｒがアルキル基と、アルキルベンゼン基と、ジノニルナフタレン基とからなる群から選ばれる少なくとも１種の基を含むと共にＭが亜鉛と、バリウムと、カルシウムとからなる群から選ばれる少なくとも１種の元素を含むことが好ましいことを見出した。油性剤として特に、ジノニルナフタレンスルフォン酸塩等が本発明の課題を満たし、好適であることを発見した。特に亜鉛、バリウム、カルシウムのスルフォン酸塩は摩擦低減に効果的である。スルフォン酸塩の添加量としては、グリース全量に対して０．０３〜４．０重量％であるのが好ましい。０．０３重量％未満であると効果に乏しく、４．０重量％よりも多いとナイロン樹脂に対する悪影響が顕著化しはじめる。 The inventor includes a sulfonate salt represented by the general formula RSO 3 M as the oily agent, wherein R is at least one selected from the group consisting of an alkyl group, an alkylbenzene group, and a dinonylnaphthalene group. It has been found that it is preferable that M contains at least one element selected from the group consisting of zinc, barium and calcium. In particular, it has been found that dinonyl naphthalene sulfonate and the like satisfy the problems of the present invention as oily agents. In particular, zinc, barium, and calcium sulfonates are effective in reducing friction. The amount of sulfonate added is preferably 0.03 to 4.0% by weight based on the total amount of grease. If it is less than 0.03% by weight, the effect is poor, and if it is more than 4.0% by weight, the adverse effect on the nylon resin starts to become noticeable.

グリースに対して、ワックス又はフッ素樹脂等を配合することも、本願発明の伸縮軸の低摩擦化に有効である。ワックスとしは、ポリエチレン、ポリプロピレン、モンタン酸部分ケン化エステルワックス、脂肪酸アマイド等を用いる。フッソ樹脂としては、ポリテトラフルオロエチレン等である。数種類のワックス、数種類のフッソ樹脂、又は数種類のワックスとフッソ樹脂を併用してもよい。これらの化合物は、固体潤滑剤として機能し、摺動面で低せん断応力で自壊、変形、へき開することによって摩擦低減を達成する。これらの固体潤滑剤の添加量はグリース全量に対して１．０〜１０．０重量％であることが好ましい。１．０重量％未満であると効果に乏しい。１０．０重量％より多くても構わないが、量に見合うだけの効果が発現せず、コスト上不利である。   It is also effective to reduce the friction of the telescopic shaft of the present invention by blending wax or fluororesin with grease. As the wax, polyethylene, polypropylene, montanic acid partially saponified ester wax, fatty acid amide and the like are used. Examples of the fluorine resin include polytetrafluoroethylene. Several types of waxes, several types of fluorine resins, or several types of waxes and fluorine resins may be used in combination. These compounds function as solid lubricants and achieve friction reduction by self-destructing, deforming and cleaving at low shear stress on the sliding surface. The amount of these solid lubricants added is preferably 1.0 to 10.0% by weight based on the total amount of grease. If it is less than 1.0% by weight, the effect is poor. Although it may be more than 10.0% by weight, an effect corresponding to the amount does not appear, which is disadvantageous in terms of cost.

本発明のグリースは、少なくとも基油と増ちょう剤を含むが、油性剤、固体潤滑剤の他に、必要に応じて耐摩耗剤、酸化防止剤、錆止め剤、粘着剤、及び構造安定剤等を含んでもよい。   The grease of the present invention contains at least a base oil and a thickener, but in addition to an oily agent and a solid lubricant, if necessary, an antiwear agent, an antioxidant, a rust inhibitor, an adhesive, a structural stabilizer, etc. May be included.

本発明のグリースを雄スプライン軸と雌スプライン軸の間に介在させる場合、グリースの量は、従来から採用されている量であり、特に限定されない。   When the grease of the present invention is interposed between the male spline shaft and the female spline shaft, the amount of grease is an amount conventionally employed and is not particularly limited.

図２に示した雄スプライン軸の断面図の外形は、歯車状であるが、本発明においてはこの形を必ずしも踏襲する必要はない。雄スプライン軸と雌スプライン軸の間の軸方向の摺動を阻害せず、且つ動力伝達がスムーズに実行できる形状であればよいのである。当業者は、本発明に好適に使用できる種々の雄スプライン軸の断面図を示すことができる。    The outer shape of the sectional view of the male spline shaft shown in FIG. 2 is a gear shape, but in the present invention, it is not always necessary to follow this shape. Any shape can be used as long as it does not hinder axial sliding between the male spline shaft and the female spline shaft and the power can be transmitted smoothly. One skilled in the art can show cross-sectional views of various male spline shafts that can be suitably used in the present invention.

雄スプライン軸の外接円の直径Ｒｏと断面図の中心を中心とする内接円の直径Ｒｉの比Ｒｉ／Ｒｏは０．５〜０．９９であるのが好ましい（図６参照）。０．５よりも小さいと、捻り応力等に対する雄スプライン軸の強度が低下してしまい好ましくない。更に、削り加工の場合、加工時の削り代が増大するので製造コスト上も不利である。Ｒｉ／Ｒｏが０．９９より大きいと十分な負荷容量が得られず過大なトルクを伝達するときに破損する可能性があり、最悪の場合、雄スプライン軸と雌スプライン軸の間の動力伝達が実現できず空転する（図６参照）。   The ratio Ri / Ro between the diameter Ro of the circumscribed circle of the male spline shaft and the diameter Ri of the inscribed circle centered on the center of the sectional view is preferably 0.5 to 0.99 (see FIG. 6). If it is smaller than 0.5, the strength of the male spline shaft against torsional stress or the like is lowered, which is not preferable. Further, in the case of machining, the machining cost at the time of machining increases, which is disadvantageous in terms of manufacturing cost. If Ri / Ro is greater than 0.99, sufficient load capacity cannot be obtained and damage may occur when transmitting excessive torque. In the worst case, power transmission between the male spline shaft and the female spline shaft is not possible. It cannot be realized and runs idle (see FIG. 6).

雄スプライン軸の軸方向に垂直に見て、雄スプライン軸の断面外径におけるスプライン嵌合部が、雄スプライン軸外形上に６０°未満の鋭角形状が存在しないようにすることが好ましい。同様に、雌スプライン軸の軸方向に垂直に見て、雌スプライン軸の断面内径におけるスプライン嵌合部が、雌スプライン軸の外形上に６０°未満の鋭角形状が存在しないようにすることが好ましい。スプライン嵌合部にその様な鋭角形状部位が存在すると応力集中が発生し、該部位にてナイロン樹脂皮膜が破損する可能性がある。   When viewed perpendicular to the axial direction of the male spline shaft, it is preferable that the spline fitting portion at the outer diameter of the cross section of the male spline shaft does not have an acute angle shape of less than 60 ° on the outer shape of the male spline shaft. Similarly, it is preferable that the spline fitting portion at the inner diameter of the cross section of the female spline shaft does not have an acute angle shape of less than 60 ° on the outer shape of the female spline shaft when viewed perpendicularly to the axial direction of the female spline shaft. . If such a sharp-angled portion exists in the spline fitting portion, stress concentration occurs, and the nylon resin film may be damaged at the portion.

さらに、雄スプライン軸の軸方向に垂直に見て、雄スプライン軸外径においてスプライン嵌合部を形成する部分の全長が２πＲｉ×５以下であるとより好適である。雄スプライン軸外径の全長が２πＲｉ×５よりも大きいと接触面積の増大から摩擦力が増してしまう。   Furthermore, it is more preferable that the total length of the portion forming the spline fitting portion at the male spline shaft outer diameter is 2πRi × 5 or less when viewed perpendicular to the axial direction of the male spline shaft. If the total length of the male spline shaft outer diameter is larger than 2πRi × 5, the frictional force increases due to the increase in the contact area.

図２に示す断面形状を有するスプライン嵌合部にグリースを塗布し、軸方向に往復摺動を為さしめたときの摩擦係数を機器により測定した。また、摺動回数５０００回毎に雄スプライン軸と雌スプライン軸の間のガタ付きを測定し、ガタ付きが１００μｍを超えた時点における経過時間を耐久寿命とした。得られた結果を表１と表２に示す。表１と表２に摩擦係数と耐久寿命の測定結果を、比較例１の測定結果で得られたこれらの値に対する比として示した。   Grease was applied to the spline fitting portion having the cross-sectional shape shown in FIG. 2, and the friction coefficient when the reciprocating sliding was performed in the axial direction was measured with an instrument. Further, the backlash between the male spline shaft and the female spline shaft was measured every 5000 times of sliding, and the elapsed time when the backlash exceeded 100 μm was defined as the endurance life. The obtained results are shown in Tables 1 and 2. Tables 1 and 2 show the measurement results of the coefficient of friction and the durability life as a ratio to these values obtained from the measurement result of Comparative Example 1.

いずれの例の場合も、雄スプライン軸にのみナイロン樹脂の皮膜を形成した。雌スプライン軸のスプライン嵌合部の表面粗さは、最大高さＲｙで１０μｍである。雄スプライン軸の軸方向に垂直に見て、前記雄スプライン軸の外接円の直径Ｒｏと断面中心を中心とする内接円の直径Ｒｉの比Ｒｉ／Ｒｏは０．８である。 雄スプライン軸の軸方向に垂直に見て、前記雄スプライン軸の断面外径における前記スプライン嵌合部が、全長２×π×４０×５ｍｍ以下である。また、いずれの測定条件も摺動速度は０．５ｍ／ｓ、雰囲気温度は室温である。動粘度は、ＪＩＳのＫ２２８３の方法に従って測定した。摩擦係数は、雄軸端面に取り付けたロードセルで摩擦力を検出することによって測定した。   In any case, a nylon resin film was formed only on the male spline shaft. The surface roughness of the spline fitting portion of the female spline shaft is 10 μm at the maximum height Ry. When viewed perpendicular to the axial direction of the male spline shaft, the ratio Ri / Ro between the diameter Ro of the circumscribed circle of the male spline shaft and the diameter Ri of the inscribed circle centering on the center of the cross section is 0.8. When viewed perpendicular to the axial direction of the male spline shaft, the spline fitting portion at the outer diameter of the cross section of the male spline shaft has a total length of 2 × π × 40 × 5 mm or less. Also, in any measurement conditions, the sliding speed is 0.5 m / s, and the ambient temperature is room temperature. The kinematic viscosity was measured according to the method of JIS K2283. The friction coefficient was measured by detecting the friction force with a load cell attached to the end face of the male shaft.

実施例に用いたＰＡＯは、全てモービル・ケミカル・プロダクツ・インターナショナル・インク社製である。実施例１〜４、７〜２１、比較例１、３のＰＡＯは、Ｍｏｂｉｌ ＳＨＦ１０１とＭｏｂｉｌ ＳＨＦ８２の混合物である。実施例５のＰＡＯは、Ｍｏｂｉｌ ＳＨＦ４０３とＭｏｂｉｌ ＳＨＦ１０１の混合物である。実施例６のＰＡＯは、Ｍｏｂｉｌ ＳＨＦ６１とＭｏｂｉｌ ＳＨＦ４１の混合物である。比較例２のＰＡＯは、Ｍｏｂｉｌ ＳＨＦ２０とＭｏｂｉｌ ＳＨＦ４１の混合物である。鉱油は、ＳＵＮ１００Ｎ（日本サン石油製）とＳＵＮ５００Ｎ（日本サン石油製）の混合物である。   The PAOs used in the examples are all manufactured by Mobil Chemical Products International Inc. The PAOs of Examples 1 to 4, 7 to 21, and Comparative Examples 1 and 3 are a mixture of Mobil SHF101 and Mobil SHF82. The PAO of Example 5 is a mixture of Mobile SHF403 and Mobile SHF101. The PAO of Example 6 is a mixture of Mobile SHF61 and Mobile SHF41. The PAO of Comparative Example 2 is a mixture of Mobil SHF20 and Mobil SHF41. Mineral oil is a mixture of SUN100N (manufactured by Nippon San Oil) and SUN500N (manufactured by Nippon Sun Oil).

実施例に用いた増ちょう剤は以下の通りである。リチウム石けんは、実施例１、５〜１９、比較例２、３では、ステアリン酸リチウムを、実施例２０では、１２ヒドロキシステアリン酸リチウムである。実施例２１のリチウム複合石けんは、１２ヒドロキシステアリン酸リチウム７５重量部とアゼライン酸リチウム２５重量部である。実施例２のアルミニウム石けんは、ステアリン酸アルミニウムである。実施例３のカルシウム石けんは、ステアリン酸カルシウムである。実施例４のナトリウム石けんはいずれもステアリン酸ナトリウムである。   The thickeners used in the examples are as follows. The lithium soap is lithium stearate in Examples 1 to 5 to 19 and Comparative Examples 2 and 3, and lithium hydroxystearate in Example 20. The lithium composite soap of Example 21 is 75 parts by weight of lithium 12 hydroxystearate and 25 parts by weight of lithium azelate. The aluminum soap of Example 2 is aluminum stearate. The calcium soap of Example 3 is calcium stearate. All of the sodium soaps of Example 4 are sodium stearate.

実施例に用いた油性剤は、いずれもキング工業（KING INDUSTRIES）社で製造された商品を使用した。実施例８、１２、２１、比較例３のスルフォン酸バリウムは、同社の商品名Ｎａ−ｓｕｌ ＢＳＮである。実施例９のスルフォン酸亜鉛は、同社の商品名Ｎａ−ｓｕｌ ＺＳである。実施例１０、１９、２０のスルフォン酸カルシウムは、同社の商品名Ｎａ−ｓｕｌ ７２９である。実施例１１のスルフォン酸ナトリウムは、同社の商品名Ｎａ−ｓｕｌ ＳＳである。   As the oily agent used in the examples, products manufactured by KING INDUSTRIES were used. The barium sulfonate of Examples 8, 12, and 21 and Comparative Example 3 is the company's trade name Na-sul BSN. The zinc sulfonate of Example 9 is the company's trade name Na-sul ZS. The calcium sulfonate of Examples 10, 19, and 20 is the company's trade name Na-sul 729. The sodium sulfonate of Example 11 is the company's trade name Na-sul SS.

各実施例と比較例のグリースの塗布量は、嵌合部全域に０．０２ｇ／ｃｍ2となるように調整した。 The amount of grease applied in each example and comparative example was adjusted to 0.02 g / cm 2 over the entire fitting portion.

混和ちょう度は、調製したグリースのちょう度のことであり、ＪＩＳのＫ２２２０（５・３）の方法により測定した。   The blending consistency is the consistency of the prepared grease, and was measured by the method of JIS K2220 (5.3).

Figure 2006123820
Figure 2006123820

Figure 2006123820
実施例１〜４と比較例１との比較によって、金属石けんを増ちょう剤とするグリースが低摩擦化、耐久寿命向上に効果を奏することがわかる。スプライン嵌合部の摩擦が低減されると、ナイロン樹脂の皮膜にかかる負荷が軽減されるため、ナイロン樹脂の摩耗,剥離が抑制される。
Figure 2006123820
 From comparison between Examples 1 to 4 and Comparative Example 1, it can be seen that the grease using metal soap as a thickener is effective in reducing friction and improving durability. When the friction at the spline fitting portion is reduced, the load applied to the nylon resin film is reduced, so that wear and peeling of the nylon resin are suppressed.

実施例６と比較例２の比較から、基油動粘度が４０℃において２０ｍｍ2／ｓ未満であると摩擦係数が上昇し、耐久性が劣化することがわかる。油膜の構成が不充分となるためであると考えられる。 From a comparison between Example 6 and Comparative Example 2, it can be seen that if the base oil kinematic viscosity is less than 20 mm 2 / s at 40 ° C., the friction coefficient increases and the durability deteriorates. This is thought to be because the oil film structure is insufficient.

実施例１２と比較例３の比較から、スルフォン酸塩の添加量がグリース全量に対して４．０重量％よりも多くなると、スルフォン酸塩のナイロン樹脂に対する攻撃性が顕在化して耐久寿命が低下することがわかる。   From the comparison between Example 12 and Comparative Example 3, when the amount of sulfonate added exceeds 4.0% by weight with respect to the total amount of grease, the aggressiveness of the sulfonate to the nylon resin becomes obvious and the durability life decreases. I understand that

実施例１の組成のグリースを潤滑用途に使用して、雌スプライン軸のスプライン嵌合部の表面粗さを変化させた場合の摩擦係数の変化を観察した。雄スプライン軸にはナイロン樹脂の皮膜を形成してある。結果を図７に示す。但し、図７においては、最大高さＲｙが２５μｍである場合の摩擦係数を基準に各測定値を比として示してある。図７から、スプライン嵌合部の表面粗さがＲｙで、１３μｍ以下であることが低摺動性を実現せしめる上で必要な条件であると判断できる。   The grease having the composition of Example 1 was used for lubrication, and the change in the friction coefficient was observed when the surface roughness of the spline fitting portion of the female spline shaft was changed. A nylon resin film is formed on the male spline shaft. The results are shown in FIG. However, in FIG. 7, each measured value is shown as a ratio based on the friction coefficient when the maximum height Ry is 25 μm. From FIG. 7, it can be determined that the surface roughness of the spline fitting portion is Ry and is 13 μm or less is a necessary condition for realizing low slidability.

本発明の一実施の形態に係る車両ステアリング用伸縮軸の分解斜視図である。1 is an exploded perspective view of a telescopic shaft for vehicle steering according to an embodiment of the present invention. （ａ）は、図１に示した車両ステアリング用伸縮軸の雄スプライン軸の横断面図であり、（ｂ）は、同伸縮軸の雌スプライン軸の横断面図である。(A) is a cross-sectional view of the male spline shaft of the telescopic shaft for vehicle steering shown in FIG. 1, and (b) is a cross-sectional view of the female spline shaft of the telescopic shaft. 一般的な自動車の操舵機構部の側面図である。It is a side view of a general automobile steering mechanism. 摺動面の両面がナイロン樹脂である場合（左側図）と片面がナイロン樹脂であり他方の片面が金属である場合（右側図）との摺動面のアミド結合の電気的作用を示す。It shows the electrical action of the amide bond on the sliding surface when both surfaces of the sliding surface are nylon resin (left side view) and when one side is nylon resin and the other side surface is metal (right side view). 下部にナイロン樹脂膜の化学式を上部に金属石けんの化学式をいずれも模式的に示し、アミド結合と極性に由来する電気的な結びつきを示す。The chemical formula of the nylon resin film is schematically shown at the bottom, and the chemical formula of the metal soap is schematically shown at the top, showing the electrical connection derived from the amide bond and polarity. 雄スプライン軸の外接円と内接円の直径を示す。Indicates the diameter of the circumscribed circle and the inscribed circle of the male spline shaft. 雄スプライン軸にナイロン樹脂の皮膜を形成し、雌スプライン軸の金属の表面粗さを変化させた場合の摩擦係数を示す。The coefficient of friction when a nylon resin film is formed on the male spline shaft and the metal surface roughness of the female spline shaft is changed is shown.

符号の説明Explanation of symbols

１ 雄スプライン軸（雄軸）
２ 雌スプライン軸（雌軸）
３ａ、３ｂ ナイロン樹脂の皮膜 1 Male spline shaft (male shaft)
2 Female spline shaft (Female shaft)
3a, 3b Nylon resin coating

Claims (12)

車両のステアリングシャフトに組込み、雄スプライン軸と雌スプライン軸を回転不能に且つ摺動自在に嵌合した車両ステアリング用伸縮軸において、前記雄スプライン軸と雌スプライン軸のいずれか一方又は双方の軸のスプライン嵌合部表面にナイロン樹脂の皮膜を形成し、且つ、少なくとも基油と増ちょう剤を含むグリースを前記雄スプライン軸と雌スプライン軸の間に介在させ、前記基油が合成炭化水素油と鉱油からなる群から選択される少なくとも１種の炭化水素油を含むと共に４０℃において２０ｍｍ2／ｓ以上の動粘度を有し、前記増ちょう剤が金属石けん又は金属複合石けんを含むことを特徴とする車両ステアリング用伸縮軸。 In a telescopic shaft for vehicle steering that is incorporated in a steering shaft of a vehicle and has a male spline shaft and a female spline shaft that are non-rotatable and slidably fitted, one or both of the male spline shaft and the female spline shaft A nylon resin film is formed on the surface of the spline fitting portion, and grease containing at least a base oil and a thickener is interposed between the male spline shaft and the female spline shaft, and the base oil is a synthetic hydrocarbon oil. It contains at least one hydrocarbon oil selected from the group consisting of mineral oils and has a kinematic viscosity of 20 mm 2 / s or more at 40 ° C., and the thickener contains metal soap or metal composite soap, Telescopic shaft for vehicle steering. 前記グリース中に前記合成炭化水素油と鉱油からなる群から選択される少なくとも１種の炭化水素油を前記基油全量に対して７０重量％以上含有することを特徴とする、請求項１記載の車両ステアリング用伸縮軸。 2. The grease according to claim 1, wherein the grease contains at least one hydrocarbon oil selected from the group consisting of the synthetic hydrocarbon oil and mineral oil in an amount of 70% by weight or more based on the total amount of the base oil. Telescopic shaft for vehicle steering. 前記金属石けん又は金属複合石けんが、ステアリン酸と、１２−ヒドロキシステアリン酸と、アゼライン酸とからなる群から選択される少なくとも１つの高級脂肪酸基と、リチウムと、亜鉛と、カルシウムと、バリウムと、アルミニウムとからなる群から選択される少なくとも１種の金属元素とからなることを特徴とする、請求項１又は２のいずれか１項記載の車両ステアリング用伸縮軸。 The metal soap or metal composite soap is at least one higher fatty acid group selected from the group consisting of stearic acid, 12-hydroxystearic acid, and azelaic acid, lithium, zinc, calcium, and barium; The telescopic shaft for vehicle steering according to claim 1 or 2, comprising at least one metal element selected from the group consisting of aluminum. 前記雄スプライン軸と雌スプライン軸の一方の軸の前記スプライン嵌合部表面に前記ナイロン樹脂の皮膜を形成し、且つ、前記ナイロン樹脂の皮膜を形成していない他方の軸の前記スプライン嵌合部の表面粗さが最大高さＲｙで１３μｍ以下であることを特徴とする、請求項１〜３のいずれか１項記載の車両ステアリング用伸縮軸。 The nylon resin film is formed on the surface of the spline fitting part of one of the male spline shaft and the female spline shaft, and the spline fitting part of the other shaft not formed with the nylon resin film The telescopic shaft for vehicle steering according to any one of claims 1 to 3, wherein the surface roughness of the vehicle is 13 µm or less at the maximum height Ry. 前記一方の軸が雄スプライン軸であることを特徴とする、請求項４記載の車両ステアリング用伸縮軸。 The telescopic shaft for vehicle steering according to claim 4, wherein the one shaft is a male spline shaft. 前記雄スプライン軸の軸方向に垂直に見て、前記雄スプライン軸の外接円の直径Ｒｏと断面中心を中心とする内接円の直径Ｒｉの比Ｒｉ／Ｒｏが０．５〜０．９９であることを特徴とする、請求項１〜５のいずれか１項記載の車両ステアリング用伸縮軸。 When viewed perpendicular to the axial direction of the male spline shaft, the ratio Ri / Ro of the diameter Ro of the circumscribed circle of the male spline shaft and the diameter Ri of the inscribed circle centering on the cross-sectional center is 0.5 to 0.99. The telescopic shaft for vehicle steering according to any one of claims 1 to 5, wherein the telescopic shaft for vehicle steering is provided. 前記雄スプライン軸の軸方向に垂直に見て、前記雄スプライン軸の断面外径における前記スプライン嵌合部が、全長で２πＲｉ×５以下であり、且つ、前記雌スプライン軸の外形上に６０°未満の鋭角形状を有しないことを特徴とする、請求項１〜６のいずれか１項記載の車両ステアリング用伸縮軸。 When viewed perpendicular to the axial direction of the male spline shaft, the spline fitting portion at the outer diameter of the cross section of the male spline shaft is 2πRi × 5 or less in total length, and 60 ° on the outer shape of the female spline shaft. The telescopic shaft for vehicle steering according to any one of claims 1 to 6, wherein the telescopic shaft for a vehicle steering has no acute-angled shape. 前記雌スプライン軸の軸方向に垂直に見て、前記雌スプライン軸の断面内径における前記スプライン嵌合部が、前記雌スプライン軸の外形上に６０°未満の鋭角形状を有しないことを特徴とする、請求項１〜７のいずれか１項記載の車両ステアリング用伸縮軸。 When viewed perpendicular to the axial direction of the female spline shaft, the spline fitting portion at the cross-sectional inner diameter of the female spline shaft does not have an acute angle shape of less than 60 ° on the outer shape of the female spline shaft. The telescopic shaft for vehicle steering according to any one of claims 1 to 7. 前記グリースが、油性剤として、一般式ＲＳＯ3Ｍが示すスルフォン酸塩を含有し、式中、Ｒがアルキル基と、アルキルベンゼン基と、ジノニルナフタレン基とからなる群から選ばれる少なくとも１種の基を含むと共にＭが亜鉛と、バリウムと、カルシウムとからなる群から選ばれる少なくとも１種の元素を含むことを特徴とする、請求項１〜８のいずれか１項記載の車両ステアリング用伸縮軸。 The grease contains a sulfonate represented by the general formula RSO 3 M as an oil agent, wherein R is at least one selected from the group consisting of an alkyl group, an alkylbenzene group, and a dinonylnaphthalene group. The telescopic shaft for vehicle steering according to any one of claims 1 to 8, characterized in that it includes a group and M includes at least one element selected from the group consisting of zinc, barium, and calcium. . 前記グリースが、油性剤として、一般式ＲＳＯ3Ｍが示すスルフォン酸塩を含有し、式中、Ｒがジノニルナフタレン基である、請求項９記載の車両ステアリング用伸縮軸。 The telescopic shaft for vehicle steering according to claim 9, wherein the grease contains a sulfonate represented by the general formula RSO 3 M as an oily agent, wherein R is a dinonylnaphthalene group. 前記グリースが、油性剤として、前記一般式ＲＳＯ3Ｍが示すスルフォン酸塩を前記グリース全量に対して０．０３〜４．０重量％含有することを特徴とする、請求項９又は１０のいずれか１項記載の車両ステアリング用伸縮軸。 11. The grease according to claim 9, wherein the grease contains 0.03 to 4.0 wt% of a sulfonate represented by the general formula RSO 3 M based on the total amount of the grease as an oily agent. The telescopic shaft for vehicle steering according to claim 1. 前記グリースが、ワックスとフッ素樹脂からなる群から選択される少なくとも１つの固体湿潤剤を前記グリース全量に対して１．０〜１０．０重量％含有することを特徴とする、請求項１〜１１のいずれか１項記載の車両ステアリング用伸縮軸。

The grease comprises 1.0 to 10.0% by weight of at least one solid wetting agent selected from the group consisting of wax and fluororesin, based on the total amount of the grease. The telescopic shaft for vehicle steering according to any one of the above.

JP2004316963A 2004-10-29 2004-10-29 Telescopic shaft for vehicle steering Pending JP2006123820A (en)

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JP2013173956A (en) * 2013-06-10 2013-09-05 Ntn Corp Grease-filled bearing
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JPWO2018070180A1 (en) * 2016-10-11 2019-07-18 日立オートモティブシステムズ株式会社 Propeller shaft and method of manufacturing the same
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