JP2005014640A

JP2005014640A - Wheel nut and wheel bolt

Info

Publication number: JP2005014640A
Application number: JP2003178215A
Authority: JP
Inventors: Yoshiyuki Ota; 禎之太田; Keiji Nomura; 圭史野村
Original assignee: Sugiura Seisakusho Co Ltd
Current assignee: Sugiura Seisakusho Co Ltd
Priority date: 2003-06-23
Filing date: 2003-06-23
Publication date: 2005-01-20
Anticipated expiration: 2023-06-23
Also published as: JP3905497B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel nut which does not require the adjustment for the precision of the fitting (contact) between the outer peripheral surface of the cylindrical section of the nut body and the inner peripheral surface of the cylindrical section of a washer, and can reduce the cost for the manufacture/assembly, and also, to provide a wheel bolt which does not require the adjustment for the precision of the fitting (contact) between the outer peripheral surface of the spindle-like section of the bolt body and the inner peripheral surface of the cylindrical section of the washer, and can reduce costs for the manufacture/assembly. <P>SOLUTION: The fitting (contact) position of the tapered form diameter expanded surface 2b of a bolt insertion hole 2a and the tapered outer peripheral surface 20b of the washer 20 is adjusted with the positioning between the seat surface 12a of a flange section 12 and the end surface 20a of the washer 20 when the wheel nut 100 is assembled as a reference. Thus, the fastening between a hub 1 and a disk wheel 2 is precisely performed, and slacking of the wheel nut 100 and a breakage of the wheel bolt 3 become hard to occur. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、車体側のハブとディスクホイールとを締結するために用いられるホイールナット（ハブナットとも称する）及びホイールボルト（ハブボルトとも称する）に関する。
【０００２】
【従来の技術】
例えば、ディスクホイールにハブとは反対側に向って拡径するテーパ状のボルト挿通孔を形成し、ホイールナットをナット本体とテーパ状外周面を有する座金とから構成して、均等な締付力でディスクホイールをハブに締結可能とする技術が知られている（特許文献１参照）。また、同様に、ホイールボルトをボルト本体とテーパ状外周面を有する座金とから構成して、均等な締付力でディスクホイールをハブに締結可能とする技術も知られている（特許文献２参照）。
【０００３】
【特許文献１】
実公平６−１２９６１号公報
【特許文献２】
実公平７−４３２９号公報
【０００４】
【発明が解決しようとする課題】
しかし、特許文献１のホイールナットでは、その製造・組立工程において、
▲１▼内側に雌ねじ部が形成されたナット本体の筒状部の外周面と、ナット本体の筒状部に外嵌される座金の筒状部の内周面との嵌合（接触）の精度；
▲２▼ナット本体のフランジ部の座面と座金の外側端面との嵌合（接触）の精度；
▲３▼ディスクホイールのボルト挿通孔のテーパ状拡径面と座金のテーパ状外周面との嵌合（接触）の精度；
をそれぞれ調整する必要がある。したがって、これら▲１▼〜▲３▼で示される３つの嵌合の精度が同時に満足されないとホイールボルトに曲げ力が作用し、ホイールナットに緩みを生じたり、ホイールボルトが折損したりしやすくなる。
【０００５】
また、特許文献２のホイールボルトでも、同様に製造・組立工程において、
▲４▼先端側に雄ねじ部が形成されたボルト本体の軸状部の外周面と、ボルト本体の軸状部に外嵌される座金の筒状部の内周面との嵌合（接触）の精度；
▲５▼ボルト本体のフランジ部の座面と座金の外側端面との嵌合（接触）の精度；
▲６▼ディスクホイールのボルト挿通孔のテーパ状拡径面と座金のテーパ状外周面との嵌合（接触）の精度；
をそれぞれ調整する必要がある。したがって、これら▲４▼〜▲６▼で示される３つの嵌合の精度が同時に満足されないとホイールボルトに曲げ力が作用し、ホイールボルトに緩みを生じたり、折損したりしやすくなる。
【０００６】
本発明の課題は、ナット本体の筒状部の外周面と座金の筒状部の内周面との嵌合（接触）の精度を調整せずにすみ、製造・組立のコストダウンを図ることのできるホイールナットを提供することにある。また、本発明の課題は、ボルト本体の軸状部の外周面と座金の筒状部の内周面との嵌合（接触）の精度を調整せずにすみ、製造・組立のコストダウンを図ることのできるホイールボルトを提供することにある。
【０００７】
【課題を解決するための手段及び発明の効果】
上記課題を解決するために、本発明のホイールナットは、
対向配置される車体側のハブとは反対側に向って拡径するボルト挿通孔が形成されたディスクホイールを、該ハブに締結するためのホイールナットであって、
前記ハブ側から前記ボルト挿通孔に挿通されるホイールボルトの雄ねじ部と螺合する雌ねじ部と、そのホイールボルトとの螺合による締結力を受け止めるフランジ部とを有するナット本体と、
前記ディスクホイールとナット本体との間に位置するとともに、そのナット本体のフランジ部の座面に接触する端面と前記ボルト挿通孔の拡径面に接触する外周面とを有する座金と、
それらナット本体と座金とに跨って外側から両者を係合保持する係合部材と、
を含むことを特徴とする。
【０００８】
このホイールナットによれば、係合部材がナット本体と座金とに跨って外側から両者を係合保持するので、ナット本体の筒状部の外周面と座金の筒状部の内周面とを嵌合（接触）させる必要がなくなる。つまり、
（１）ナット本体のフランジ部の座面と座金の端面との嵌合（接触）の精度と、
（２）ディスクホイールのボルト挿通孔の拡径面と座金のテーパ状外周面との嵌合（接触）の精度と、
を調整すればよくなり、製造・組立のコストダウンを図ることができる。具体的には、前述の▲１▼〜▲３▼の調整を同時複合的に実行しなくても、上記（１）及び（２）のうちのいずれか一方の嵌合を調整の基準とし、他方をそれに合わせて調整すればよいので、手順が単純化され熟練者でなくても容易に製造・組立が行なえる。したがって、ナット本体と座金との部品製造工程及び両者の組立工程において、部品（係合部材）の増加に伴う原価上昇分を上回るコストダウンが可能となる。
【０００９】
また、ホイールボルトの雄ねじ部とホイールナットの雌ねじ部とによる螺合長さが確保されていれば、ナット本体の筒状部を省略することができ、ナット本体の製造原価も抑制することができる。さらに、係合部材の採用によりナット本体と座金とのかしめを要しなくなるので、かしめ時におけるメッキ層の剥離・キズの発生等が減少し防錆効果や装飾効果も向上する。
【００１０】
次に、上記課題を解決するために、本発明のホイールボルトは、
対向配置される車体側のハブとは反対側に向って拡径するボルト挿通孔が形成されたディスクホイールを、該ハブに締結するためのホイールボルトであって、
前記ボルト挿通孔に挿通されて前記ハブに形成された雌ねじ部と螺合する雄ねじ部と、その雌ねじ部との螺合による締結力を受け止めるフランジ部とを有するボルト本体と、
前記ディスクホイールとボルト本体との間に位置するとともに、そのボルト本体のフランジ部の座面に接触する端面と前記ボルト挿通孔の拡径面に接触する外周面とを有する座金と、
それらボルト本体と座金とに跨って外側から両者を係合保持する係合部材と、
を含むことを特徴とする。
【００１１】
このホイールボルトによれば、係合部材がボルト本体と座金とに跨って外側から両者を係合保持するので、ボルト本体の軸状部の外周面と座金の筒状部の内周面とを嵌合（接触）させる必要がなくなる。つまり、
（３）ボルト本体のフランジ部の座面と座金の端面との嵌合（接触）の精度と、
（４）ディスクホイールのボルト挿通孔の拡径面と座金のテーパ状外周面との嵌合（接触）の精度と、
を調整すればよくなり、製造・組立のコストダウンを図ることができる。具体的には、前述の▲４▼〜▲６▼の調整を同時複合的に実行しなくても、上記（３）及び（４）のうちのいずれか一方の嵌合を調整の基準とし、他方をそれに合わせて調整すればよいので、手順が単純化され熟練者でなくても容易に製造・組立が行なえる。したがって、ボルト本体と座金との部品製造工程及び両者の組立工程において、部品（係合部材）の増加に伴う原価上昇分を上回るコストダウンが可能となる。
【００１２】
また、係合部材の採用によりボルト本体と座金とのかしめを要しなくなるので、かしめ時におけるメッキ層の剥離・キズの発生等が減少し防錆効果や装飾効果も向上する。
【００１３】
なお、以上のようなホイールナット又はホイールボルトにおいて、例えば、ボルト挿通孔の軸線を含む半断面において三角形状又は台形状のテーパ座金を用いる場合には、ボルト挿通孔の拡径面と座金の外周面とがテーパ状の嵌合状態（接触状態）となる。
【００１４】
このとき、これらのホイールナット又はホイールボルトにおける係合部材は、フランジ部の座面と座金の端面とを接触保持するとともに、フランジ部の外周面と座金の外周面とをそれぞれ半径方向中心側へ押圧保持している。このように、フランジ部と座金とは、係合部材によって二方向に保持されているので安定して保持される。そして、フランジ部の座面を、ボルト挿通孔の軸線方向とほぼ直交する方向に形成し座金の端面と接触させる場合には、フランジ部と座金とは、係合部材によってボルト挿通孔の軸線方向及び半径方向（軸線方向に直交する方向）の双方向に保持され、構成の簡素化が図られている。
【００１５】
さらに、上記ホイールナット又はホイールボルトにおける係合部材を、フランジ部の外周面と座金の外周面とに跨る環状部材で構成し、環状部材の内面がこれらの外周面を外側から同時に係合保持するのが望ましい。このような環状部材を用いることによって、一層のコストダウンが図れ、フランジ部と座金から外れにくくなる。なお、環状部材は、止め輪、コイルスプリング等で構成することができる。
【００１６】
【発明の実施の形態】
まず、図１３〜図１５により、本発明の前提となるホイールナットの参考例について説明する。
図１３に示すようなテーパ状の外周面を有する座金（テーパ座金）を用いる場合、ホイールナット５００の製造・組立工程では次のような調整を要する。
▲１▼ナット本体５１０のフランジ部５１２の座面５１２ａと座金５２０の外側端面５２０ａとの嵌合（接触）精度の調整；
▲２▼ディスクホイール５０２のボルト挿通孔のテーパ状拡径面５０２ｂと座金５２０のテーパ状外周面５２０ｂとの嵌合（接触）精度の調整；
▲３▼内側に雌ねじ部５１１が形成されたナット本体５１０の筒状部５１５の外周面５１５ａと、ナット本体５１０の筒状部５１５に外嵌される座金５２０の筒状部の内周面５２０ｃとの嵌合（接触）精度の調整；
【００１７】
そして、テーパ座金を用いるホイールナットでは、特に上記▲３▼の調整が不十分なため不良品となるケースが多い。そこで、図１３〜図１５に示すように、ナット本体５１０（の筒状部５１５）と座金５２０との間に係合部を設けることができる。図１３のホイールナット５００では、ナット本体５１０の筒状部５１５の外周面５１５ａ側に凹部５１５ｂを設け、座金５２０の内周面５２０ｃ側に突出する凸部５２０ｄを嵌合させて位置調整を行う。また、図１４のホイールナット５５０では、ナット本体５１０の筒状部５１５の外周面５１５ａ側にローレット、セレーション、スプライン等の凹凸部５１５ｃを形成し、座金５２０の内周面５２０ｃ側に形成された溝部５２０ｅと嵌合させる。さらに、図１５のホイールナット５６０では、ナット本体５１０の筒状部をなくし、フランジ部５１２に突起５１２ｂを設け、座金５２０の内周面５２０ｃ側に形成される凹陥部５２０ｆと嵌合させる。
【００１８】
これらのホイールナット５００，５５０，５６０において、ナット本体５１０（の筒状部５１５）と座金５２０との間に設けられる係合部の加工精度を上げることは勿論可能である。しかし、上記▲１▼〜▲３▼で示される３つの嵌合の精度が同時に満足されないとホイールボルトに曲げ力が作用し、ホイールナットに緩みを生じたり、ホイールボルトが折損したりするおそれがある。また、ナット本体５１０と座金５２０との間に、凹部５１５ｂ・凸部５２０ｄ（図１３）、凹凸部５１５ｃ・溝部５２０ｅ（図１４）、突起５１２ｂ・凹陥部５２０ｆ（図１５）で示すような係合部を設ける必要があり、従来の部品との共用化に難がある。そこで、本発明ではホイールナット（又はホイールボルト）の基本構成を、例えば以下で述べる実施例のように変更している。
【００１９】
以下、本発明の実施の形態を、図面に示す実施例を参照して説明する。
（実施例１）
図１は、本発明のホイールナットをホイールボルトと組み合わせて使用する場合の一実施例を示す正面半断面図である。図１に示すホイールナット１００は、互いに対向配置される自動車等の車体側のハブ１とディスクホイール２とを締結するために用いられる。ディスクホイール２には、ハブ１とは反対側に向って拡径するテーパ状のボルト挿通孔２ａが所定数形成されている。つまり、各ボルト挿通孔２ａは、ハブ１側に形成された円柱状の孔と、それに続いてハブ１側とは反対側（車体外側）に広がる円錐状（又は円錐台状）の孔とを有している。また、ハブ１には、ボルト挿通孔２ａと軸線Ｏを共通にする貫通孔１ａと溝部１ｂとが形成されている。ホイールボルト３は貫通孔１ａから挿入され、その軸状部３ａの基端側外周に形成された凹凸部３ｂが溝部１ｂと嵌合する。なお、ホイールボルト３の軸状部３ａに形成される凹凸部３ｂは、例えばローレット、セレーション、スプライン等であり、凹凸部３ｂを溝部１ｂに圧入することによって、ホイールボルト３はハブ１に回転不能に固定される。
【００２０】
図２に示すように、このホイールナット１００は、ナット本体１０と座金２０とＣ形止め輪３０（環状部材；係合部材）とを含んで構成されている。このうちナット本体１０は、ハブ１側からボルト挿通孔２ａに挿通されるホイールボルト３の軸状部３ａの先端側に形成された雄ねじ部３ｃ（図１参照）と螺合する雌ねじ部１１と、ホイールボルト３との螺合による締結力を受け止めるフランジ部１２とを有している。なお、ナット本体１０の内部において、雌ねじ部１１と雄ねじ部３ｃとの螺合可能長さを比較的大きくとり、それによってフランジ部１２（の座面１２ａ）からのナット本体１０の筒状部の突出をなくしている。
【００２１】
座金２０は、ボルト挿通孔２ａの軸線Ｏ（図１参照）を含む半断面において台形状に形成され、ディスクホイール２とナット本体１０との間に位置している。つまり、座金２０は、ナット本体１０のフランジ部１２の座面１２ａに接触する端面２０ａと、ボルト挿通孔２ａのテーパ状の拡径面２ｂに接触するテーパ状の外周面２０ｂとを有するテーパ座金を構成している。
【００２２】
Ｃ形止め輪３０は、ナット本体１０と座金２０とに跨って外側から両者を係合保持する機能を有している。具体的には、Ｃ形止め輪３０は、フランジ部１２の座面１２ａと座金２０の端面２０ａとを接触保持するとともに、フランジ部１２の外周面１２ｂと座金２０のテーパ状外周面２０ｂとをそれぞれ半径方向中心側へ押圧保持している。さらに詳細には、Ｃ形止め輪３０は、フランジ部１２の外周面１２ｂと座金２０のテーパ状の外周面２０ｂとに跨るように構成され、その内面３０ａがこれらの外周面１２ｂ，２０ｂを外側から同時に係合保持している。
【００２３】
なお、ナット本体１０において、フランジ部１２の座面１２ａは、ボルト挿通孔２ａの軸線Ｏ方向とほぼ直交する方向に形成されて、座金２０の端面２０ａと接触している。また、１３はスパナ等の工具と係合する六角部、１４は防塵効果又は装飾効果を付与するために雌ねじ部１１を先端開口側（車体最外側）から覆うキャップである。
【００２４】
次に、このホイールナット１００の組立方法及びハブ１とディスクホイール２との締結方法について説明する。
（１）ホイールナット１００の組立方法（図２参照）
図２に示すように、ナット本体１０、座金２０及びＣ形止め輪３０を従来と同様の工程で製造する。なお、キャップ１４は溶接、かしめ等によってナット本体１０に固着しておく。そして、ナット本体１０のフランジ部１２の座面１２ａと座金２０の端面２０ａとを位置合わせし、Ｃ形止め輪３０をフランジ部１２の外周面１２ｂと座金２０のテーパ状の外周面２０ｂとに跨るように外側から係合保持する。このとき、ナット本体１０においてフランジ部１２の座面１２ａから突出する筒状部が省略されているので、ナット本体１０の筒状部の外周面と座金２０の筒状部の内周面２０ｃとをかしめ等によって嵌合（接触）させる必要はない。
【００２５】
（２）ハブ１とディスクホイール２との締結方法（図１参照）
ホイールボルト３をハブ１の貫通孔１ａに挿入し、溝部１ｂに凹凸部３ｂを圧入・固定する。ボルト挿通孔２ａに挿通されたホイールボルト３の雄ねじ部３ｃに、ナット本体１０の雌ねじ部１１を螺合させ、ディスクホイール２のボルト挿通孔２ａのテーパ状拡径面２ｂと座金２０のテーパ状外周面２０ｂとの嵌合（接触）位置を調整する。このように、ホイールナット１００組立時のフランジ部１２の座面１２ａと座金２０の端面２０ａとの位置合わせを基準として、ボルト挿通孔２ａのテーパ状拡径面２ｂと座金２０のテーパ状外周面２０ｂとの嵌合（接触）位置を調整すればよい。これにより、ハブ１とディスクホイール２との締結が精度よく行われ、ホイールナット１００の緩みやホイールボルト３の折損等が発生しにくくなる。
【００２６】
以上の通り、Ｃ形止め輪３０は、フランジ部１２の座面１２ａと座金２０の端面２０ａとを接触保持し、フランジ部１２の外周面１２ｂと座金２０のテーパ状外周面２０ｂとをそれぞれ半径方向中心側へ押圧保持している。また、Ｃ形止め輪３０の内面３０ａがフランジ部１２の外周面１２ｂと座金２０のテーパ状外周面２０ｂとを外側から同時に係合保持している。Ｃ形止め輪３０によってフランジ部１２と座金２０とは二方向に同時に保持されているので、保持が安定し外れにくくなる。
【００２７】
（変形例１）
図３及び図４にホイールナットの変形例を示す。このホイールナット２００では、実施例１（図１及び図２）に次のような変更を加えている。
▲１▼ナット本体１１０において、フランジ部１１２の座面１１２ａがボルト挿通孔２ａの軸線Ｏ方向と直交せずホイールボルト３側に傾斜して設けられている。それに伴って座金１２０の端面１２０ａも同方向に傾斜し、座面１１２ａと接触（嵌合）している。フランジ部１１２の座面１１２ａに傾斜（テーパ）が設けられることにより、（イ）雌ねじ部１１と雄ねじ部３ｃとの螺合長さを比較的長くとることができ、ナット本体１１０とホイールボルト３との締付固定が安定する；（ロ）座面１１２ａと座金１２０の端面１２０ａとの接触面積を比較的大きくとることができ、座金１２０の回り止め効果が大きくなる。なお、座金１２０の外周面２０ｂ（又はディスクホイール２の拡径面２ｂ）のテーパ角αよりも、座金１２０の端面１２０ａ（又はフランジ部１１２の座面１１２ａ）のテーパ角βの方が大に形成されている（図４参照）。
▲２▼Ｃ形止め輪に代えてコイルスプリング１３０（環状部材；係合部材）が設けられている。コイルスプリング１３０のばね力により径の伸縮割合を大きくとれるので、ホイールナット２００の組み立てが容易となる。
【００２８】
したがって、この場合においても、ホイールナット２００組立時のフランジ部１１２の座面１１２ａと座金１２０の端面１２０ａとの位置合わせを基準として、ボルト挿通孔２ａのテーパ状拡径面２ｂと座金１２０のテーパ状外周面２０ｂとの嵌合（接触）位置を調整する。そして、コイルスプリング１３０は、フランジ部１１２の座面１１２ａと座金１２０の端面１２０ａとを接触保持し、フランジ部１１２の外周面１２ｂと座金１２０のテーパ状外周面２０ｂとをそれぞれ半径方向中心側へ押圧保持している。また、コイルスプリング１３０の内面１３０ａがフランジ部１１２の外周面１２ｂと座金１２０のテーパ状外周面２０ｂとを外側から同時に係合保持している。
【００２９】
（変形例２）
図５及び図６にホイールナットの他の変形例を示す。このホイールナット３００では、実施例１（図１及び図２）に次のような変更を加えている。
▲１▼ナット本体２１０において、フランジ部２１２の座面１２ａから筒状部２１５が突出形成され、この筒状部２１５は座金２２０の筒状部に挿入されている。フランジ部２１２の筒状部２１５の外周面２１５ａと座金２２０の筒状部の内周面２０ｃとは、かしめ等によって嵌合（接触）されてはいない。筒状部２１５が設けられることにより、雌ねじ部１１と雄ねじ部３ｃとの螺合長さを比較的長くとることができ、ナット本体２１０とホイールボルト３との締付固定が安定する。
▲２▼Ｃ形止め輪に代えて断面矩形状の円形リング２３０（環状部材；係合部材）が設けられている。円形リング２３０は、ナット本体２１０のフランジ部２１２（外周面１２ｂ）と座金２２０の外周面２０ｂとにそれぞれ形成された凹部２１２ｄ，２２０ｄ（溝部）に焼きばめ等の締まりばめによって嵌め込まれている。円形リング２３０は凹部２１２ｄ，２２０ｄに埋め込まれてその外面から突出しないので、他物と接触しにくくなる。
【００３０】
したがって、この場合においても、ホイールナット３００組立時のフランジ部２１２の座面１２ａと座金２２０の端面２０ａとの位置合わせを基準として、ボルト挿通孔２ａのテーパ状拡径面２ｂと座金２２０のテーパ状外周面２０ｂとの嵌合（接触）位置を調整する。そして、円形リング２３０は、フランジ部２１２の座面１２ａと座金２２０の端面２０ａとを接触保持し、フランジ部２１２の外周面１２ｂと座金２２０のテーパ状外周面２０ｂとをそれぞれ半径方向中心側へ押圧保持している。また、円形リング２３０の内面２３０ａがフランジ部２１２の外周面１２ｂと座金２２０のテーパ状外周面２０ｂとを外側から同時に係合保持している。
【００３１】
なお、変形例１（図３・図４）及び変形例２（図５・図６）において、実施例１（図１・図２）と共通する機能を有する部分には同一符号を付して説明を省略する。
【００３２】
（実施例２）
図７は、本発明のホイールボルトを使用する場合の一実施例を示す正面半断面図である。図７に示すホイールボルト１８０は、互いに対向配置される自動車等の車体側のハブ１とディスクホイール２とを締結するために用いられる。ディスクホイール２には、ハブ１とは反対側に向って拡径するテーパ状のボルト挿通孔２ａが所定数形成されている。つまり、各ボルト挿通孔２ａは、ハブ１側に形成された円柱状の孔と、それに続いてハブ１側とは反対側（車体外側）に広がる円錐状（又は円錐台状）の孔とを有している。また、ハブ１には、ボルト挿通孔２ａと軸線Ｏを共通にする雌ねじ部１ｃが形成されている。
【００３３】
図８に示すように、このホイールボルト１８０は、ボルト本体５０と座金６０とＣ形止め輪７０（環状部材；係合部材）とを含んで構成されている。このうちボルト本体５０は、ボルト挿通孔２ａに挿通されてハブ１に形成された雌ねじ部１ｃ（図７参照）と螺合する雄ねじ部５１と、雌ねじ部１ｃとの螺合による締結力を受け止めるフランジ部５２とを有している。なお、ボルト本体５０において、雄ねじ部５１と雌ねじ部１ｃとの螺合可能長さを比較的大きくとり、それによってフランジ部５２（の座面５２ａ）からのボルト本体５０の筒状部の突出をなくしている。
【００３４】
座金６０は、ボルト挿通孔２ａの軸線Ｏ（図７参照）を含む半断面において台形状に形成され、ディスクホイール２とボルト本体５０との間に位置している。つまり、座金６０は、ボルト本体５０のフランジ部５２の座面５２ａに接触する端面６０ａと、ボルト挿通孔２ａのテーパ状の拡径面２ｂに接触するテーパ状の外周面６０ｂとを有するテーパ座金を構成している。
【００３５】
Ｃ形止め輪７０は、ボルト本体５０と座金６０とに跨って外側から両者を係合保持する機能を有している。具体的には、Ｃ形止め輪７０は、フランジ部５２の座面５２ａと座金６０の端面６０ａとを接触保持するとともに、フランジ部５２の外周面５２ｂと座金６０のテーパ状外周面６０ｂとをそれぞれ半径方向中心側へ押圧保持している。さらに詳細には、Ｃ形止め輪７０は、フランジ部５２の外周面５２ｂと座金６０のテーパ状の外周面６０ｂとに跨るように構成され、その内面７０ａがこれらの外周面５２ｂ，６０ｂを外側から同時に係合保持している。
【００３６】
なお、ボルト本体５０において、フランジ部５２の座面５２ａは、ボルト挿通孔２ａの軸線Ｏ方向とほぼ直交する方向に形成されて、座金６０の端面６０ａと接触している。また、５３はスパナ等の工具と係合する六角部である。
【００３７】
次に、このホイールボルト１８０の組立方法及びハブ１とディスクホイール２との締結方法について説明する。
（１）ホイールボルト１８０の組立方法（図８参照）
図８に示すように、ボルト本体５０、座金６０及びＣ形止め輪７０を従来と同様の工程で製造する。そして、ボルト本体５０のフランジ部５２の座面５２ａと座金６０の端面６０ａとを位置合わせし、Ｃ形止め輪７０をフランジ部５２の外周面５２ｂと座金６０のテーパ状の外周面６０ｂとに跨るように外側から係合保持する。このとき、ボルト本体５０においてフランジ部５２の座面５２ａから突出する筒状部が省略されているので、ボルト本体５０の軸状部の外周面と座金６０の筒状部の内周面６０ｃとをかしめ等によって嵌合（接触）させる必要はない。
【００３８】
（２）ハブ１とディスクホイール２との締結方法（図７参照）
ホイールボルト１８０をボルト挿通孔２ａに挿通し、ハブ１に形成された雌ねじ部１ｃにボルト本体５０の雄ねじ部５１を螺合させ、ディスクホイール２のボルト挿通孔２ａのテーパ状拡径面２ｂと座金６０のテーパ状外周面６０ｂとの嵌合（接触）位置を調整する。このように、ホイールボルト１８０組立時のフランジ部５２の座面５２ａと座金６０の端面６０ａとの位置合わせを基準として、ボルト挿通孔２ａのテーパ状拡径面２ｂと座金６０のテーパ状外周面６０ｂとの嵌合（接触）位置を調整すればよい。これにより、ハブ１とディスクホイール２との締結が精度よく行われ、ホイールボルト１８０の緩みや折損等が発生しにくくなる。
【００３９】
以上の通り、Ｃ形止め輪７０は、フランジ部５２の座面５２ａと座金６０の端面６０ａとを接触保持し、フランジ部５２の外周面５２ｂと座金６０のテーパ状外周面２０ｂとをそれぞれ半径方向中心側へ押圧保持している。また、Ｃ形止め輪７０の内面７０ａがフランジ部５２の外周面５２ｂと座金６０のテーパ状外周面６０ｂとを外側から同時に係合保持している。Ｃ形止め輪７０によってフランジ部５２と座金６０とは二方向に同時に保持されているので、保持が安定し外れにくくなる。
【００４０】
（変形例３）
図９及び図１０にホイールボルトの変形例を示す。このホイールボルト２８０では、実施例２（図７及び図８）に次のような変更を加えている。
▲１▼ボルト本体１５０において、フランジ部１５２の座面１５２ａがボルト挿通孔２ａの軸線Ｏ方向と直交せず軸状部の先端側に傾斜して設けられている。それに伴って座金１６０の端面１６０ａも同方向に傾斜し、座面１５２ａと接触（嵌合）している。フランジ部１５２の座面１５２ａに傾斜（テーパ）が設けられることにより、座面１５２ａと座金１６０の端面１６０ａとの接触面積を比較的大きくとることができ、座金１６０の回り止め効果が大きくなる。なお、座金１６０の外周面６０ｂ（又はディスクホイール２の拡径面２ｂ）のテーパ角αよりも、座金１６０の端面１６０ａ（又はフランジ部１５２の座面１５２ａ）のテーパ角βの方が大に形成されている（図１０参照）。
▲２▼Ｃ形止め輪に代えてコイルスプリング１７０（環状部材；係合部材）が設けられている。コイルスプリング１７０のばね力により径の伸縮割合を大きくとれるので、ホイールボルト２８０の組み立てが容易となる。
【００４１】
したがって、この場合においても、ホイールボルト２８０組立時のフランジ部１５２の座面１５２ａと座金１６０の端面１６０ａとの位置合わせを基準として、ボルト挿通孔２ａのテーパ状拡径面２ｂと座金１６０のテーパ状外周面６０ｂとの嵌合（接触）位置を調整する。そして、コイルスプリング１７０は、フランジ部１５２の座面１５２ａと座金１６０の端面１６０ａとを接触保持し、フランジ部１５２の外周面５２ｂと座金１６０のテーパ状外周面６０ｂとをそれぞれ半径方向中心側へ押圧保持している。また、コイルスプリング１７０の内面１７０ａがフランジ部１５２の外周面５２ｂと座金１６０のテーパ状外周面６０ｂとを外側から同時に係合保持している。
【００４２】
（変形例４）
図１１及び図１２にホイールボルトの他の変形例を示す。このホイールボルト３８０では、実施例２（図７及び図８）に次のような変更を加えている。
▲１▼ボルト本体２５０において、フランジ部２５２の座面５２ａから軸状部２５５が突出形成され、この軸状部２５５は座金２６０の筒状部に挿入されている。フランジ部２５２の軸状部２５５の外周面２５５ａと座金２６０の筒状部の内周面６０ｃとは、かしめ等によって嵌合（接触）されてはいない。軸状部２５５が設けられることにより、ボルト本体２５０の強度が増す。
▲２▼Ｃ形止め輪に代えて断面矩形状の円形リング２７０（環状部材；係合部材）が設けられている。円形リング２７０は、ボルト本体２５０のフランジ部２５２（外周面５２ｂ）と座金２６０の外周面６０ｂとにそれぞれ形成された凹部２５２ｄ，２６０ｄ（溝部）に焼きばめ等の締まりばめによって嵌め込まれている。円形リング２７０は凹部２５２ｄ，２６０ｄに埋め込まれてその外面から突出しないので、他物と接触しにくくなる。
【００４３】
したがって、この場合においても、ホイールボルト３８０組立時のフランジ部２５２の座面５２ａと座金２６０の端面６０ａとの位置合わせを基準として、ボルト挿通孔２ａのテーパ状拡径面２ｂと座金２６０のテーパ状外周面６０ｂとの嵌合（接触）位置を調整する。そして、円形リング２７０は、フランジ部２５２の座面５２ａと座金２６０の端面６０ａとを接触保持し、フランジ部２５２の外周面５２ｂと座金２６０のテーパ状外周面６０ｂとをそれぞれ半径方向中心側へ押圧保持している。また、円形リング２７０の内面２７０ａがフランジ部２５２の外周面５２ｂと座金２６０のテーパ状外周面６０ｂとを外側から同時に係合保持している。
【００４４】
なお、変形例３（図９・図１０）及び変形例４（図１１・図１２）において、実施例２（図７・図８）と共通する機能を有する部分には同一符号を付して説明を省略する。
【００４５】
座金（テーパ座金）の半断面形状は、平座金に比して軸線方向に相対的に長いものであれば、台形状、三角形状以外に種々の形状を用いることができる。
【図面の簡単な説明】
【図１】本発明のホイールナットをホイールボルトと組み合わせて使用する場合の一実施例を示す正面半断面図。
【図２】図１のホイールナットの正面分解半断面図。
【図３】図１のホイールナットの一変形例を示す正面半断面図。
【図４】図３のホイールナットの正面分解半断面図。
【図５】図１のホイールナットの他の変形例を示す正面半断面図。
【図６】図５のホイールナットの正面分解半断面図。
【図７】本発明のホイールボルトを使用する場合の一実施例を示す正面半断面図。
【図８】図７のホイールボルトの正面分解半断面図。
【図９】図７のホイールボルトの一変形例を示す正面半断面図。
【図１０】図９のホイールボルトの正面分解半断面図。
【図１１】図７のホイールボルトの他の変形例を示す正面半断面図。
【図１２】図１１のホイールボルトの正面分解半断面図。
【図１３】本発明の前提となるホイールナットの参考例を示す正面半断面図。
【図１４】図１３に続くホイールナットの参考例を示す正面半断面図。
【図１５】図１４に続くホイールナットの参考例を示す正面半断面図。
【符号の説明】
１ハブ
２ディスクホイール
２ａボルト挿通孔
２ｂ拡径面
１０ナット本体
１１雌ねじ部
１２フランジ部
１２ａ座面
２０座金
２０ａ端面
２０ｂ外周面
３０Ｃ形止め輪（環状部材；係合部材）
１３０コイルスプリング（環状部材；係合部材）
２３０円形リング（環状部材；係合部材）
１００，２００，３００ホイールナット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wheel nut (also referred to as a hub nut) and a wheel bolt (also referred to as a hub bolt) used for fastening a hub and a disc wheel on the vehicle body side.
[0002]
[Prior art]
For example, the disc wheel is formed with a tapered bolt insertion hole that expands in the direction opposite to the hub, and the wheel nut is composed of a nut body and a washer having a tapered outer peripheral surface to provide an even tightening force. A technique is known that enables a disc wheel to be fastened to a hub (see Patent Document 1). Similarly, there is also known a technique in which a wheel bolt is composed of a bolt body and a washer having a tapered outer peripheral surface so that the disc wheel can be fastened to the hub with a uniform tightening force (see Patent Document 2). ).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 6-12961
[Patent Document 2]
No. 7-4329
[0004]
[Problems to be solved by the invention]
However, in the wheel nut of Patent Document 1, in the manufacturing and assembly process,
(1) The fitting (contact) between the outer peripheral surface of the cylindrical portion of the nut body with the female thread portion formed on the inner side and the inner peripheral surface of the cylindrical portion of the washer that is externally fitted to the cylindrical portion of the nut body accuracy;
(2) Accuracy of fitting (contact) between the seat surface of the flange portion of the nut body and the outer end surface of the washer;
(3) Accuracy of fitting (contact) between the tapered enlarged surface of the disc wheel bolt insertion hole and the tapered outer peripheral surface of the washer;
Need to be adjusted respectively. Therefore, if the accuracy of the three fittings shown in (1) to (3) is not satisfied at the same time, a bending force acts on the wheel bolt, and the wheel nut is easily loosened or the wheel bolt is easily broken. .
[0005]
Moreover, in the wheel bolt of patent document 2, similarly in a manufacturing and assembly process,
(4) Fitting (contact) between the outer peripheral surface of the shaft-shaped portion of the bolt body having the male threaded portion formed on the tip side and the inner peripheral surface of the tubular portion of the washer that is externally fitted to the shaft-shaped portion of the bolt body Accuracy of;
(5) Accuracy of fitting (contact) between the seat surface of the flange portion of the bolt body and the outer end surface of the washer;
(6) Accuracy of fitting (contact) between the tapered enlarged surface of the bolt insertion hole of the disc wheel and the tapered outer peripheral surface of the washer;
Need to be adjusted respectively. Therefore, if the accuracy of the three fittings shown in (4) to (6) is not satisfied at the same time, a bending force acts on the wheel bolt, and the wheel bolt is liable to be loosened or broken.
[0006]
An object of the present invention is to reduce the manufacturing and assembly costs without adjusting the accuracy of fitting (contact) between the outer peripheral surface of the cylindrical portion of the nut body and the inner peripheral surface of the cylindrical portion of the washer. It is to provide a wheel nut that can be used. Further, the object of the present invention is to eliminate the need for adjusting the accuracy of fitting (contact) between the outer peripheral surface of the shaft-shaped portion of the bolt body and the inner peripheral surface of the cylindrical portion of the washer, thereby reducing the manufacturing and assembly costs. It is to provide a wheel bolt that can be realized.
[0007]
[Means for Solving the Problems and Effects of the Invention]
In order to solve the above problems, the wheel nut of the present invention is
A wheel nut for fastening a disc wheel formed with a bolt insertion hole having a diameter expanding toward a side opposite to a hub on the vehicle body side disposed opposite to the hub,
A nut main body having a female screw portion screwed with a male screw portion of a wheel bolt inserted through the bolt insertion hole from the hub side, and a flange portion receiving a fastening force by screwing with the wheel bolt;
A washer positioned between the disk wheel and the nut body, and having an end surface that contacts a seating surface of the flange portion of the nut body and an outer peripheral surface that contacts an enlarged surface of the bolt insertion hole;
An engaging member that engages and holds both from the outside across the nut body and the washer;
It is characterized by including.
[0008]
According to this wheel nut, since the engaging member engages and holds both from the outside across the nut main body and the washer, the outer peripheral surface of the cylindrical portion of the nut main body and the inner peripheral surface of the cylindrical portion of the washer There is no need to fit (contact). That means
(1) The accuracy of fitting (contact) between the seat surface of the flange portion of the nut body and the end surface of the washer;
(2) The accuracy of fitting (contact) between the enlarged diameter surface of the bolt insertion hole of the disc wheel and the tapered outer peripheral surface of the washer;
Therefore, manufacturing and assembly costs can be reduced. Specifically, even if the above adjustments (1) to (3) are not simultaneously performed in combination, one of the above (1) and (2) is used as a reference for adjustment, Since the other one has only to be adjusted accordingly, the procedure is simplified, and manufacturing and assembly can be easily performed even by an unskilled person. Therefore, in the part manufacturing process of the nut main body and the washer and the assembly process of both, the cost can be reduced exceeding the cost increase accompanying the increase in the parts (engagement members).
[0009]
Moreover, if the screwing length by the external thread part of a wheel bolt and the internal thread part of a wheel nut is ensured, the cylindrical part of a nut main body can be abbreviate | omitted and the manufacturing cost of a nut main body can also be suppressed. . Furthermore, the use of the engaging member eliminates the need for caulking between the nut body and the washer, so that the peeling of the plating layer and the occurrence of scratches during caulking are reduced, and the rust prevention effect and decoration effect are improved.
[0010]
Next, in order to solve the above-mentioned problem, the wheel bolt of the present invention is
A wheel bolt for fastening a disc wheel formed with a bolt insertion hole having a diameter expanding toward a side opposite to a vehicle body side hub disposed opposite to the hub,
A bolt main body having a male screw portion that is inserted into the bolt insertion hole and screwed with a female screw portion formed in the hub, and a flange portion that receives a fastening force by screwing with the female screw portion;
A washer positioned between the disk wheel and the bolt body, and having an end surface that contacts a seating surface of a flange portion of the bolt body and an outer peripheral surface that contacts an enlarged surface of the bolt insertion hole;
An engagement member that engages and holds both from the outside across the bolt body and the washer;
It is characterized by including.
[0011]
According to this wheel bolt, since the engaging member engages and holds both from the outside across the bolt main body and the washer, the outer peripheral surface of the shaft-shaped portion of the bolt main body and the inner peripheral surface of the cylindrical portion of the washer. There is no need to fit (contact). That means
(3) the accuracy of fitting (contact) between the seat surface of the flange portion of the bolt body and the end surface of the washer;
(4) The accuracy of fitting (contact) between the enlarged diameter surface of the bolt insertion hole of the disc wheel and the tapered outer peripheral surface of the washer;
Therefore, manufacturing and assembly costs can be reduced. Specifically, even if the above adjustments (4) to (6) are not performed simultaneously and complexly, the fitting of any one of the above (3) and (4) is used as the adjustment reference, Since the other one has only to be adjusted accordingly, the procedure is simplified, and manufacturing and assembly can be easily performed even by an unskilled person. Therefore, in the part manufacturing process of the bolt main body and the washer and the assembly process of both, the cost can be reduced exceeding the cost increase accompanying the increase in parts (engagement members).
[0012]
In addition, the use of the engaging member eliminates the need for caulking between the bolt body and the washer, so that the peeling of the plating layer and the occurrence of scratches during caulking are reduced, and the rust prevention effect and decoration effect are improved.
[0013]
In the above-described wheel nut or wheel bolt, for example, when a triangular or trapezoidal taper washer is used in the half cross section including the axis of the bolt insertion hole, the enlarged surface of the bolt insertion hole and the outer periphery of the washer The surface is in a tapered fitting state (contact state).
[0014]
At this time, the engaging members in these wheel nuts or wheel bolts hold the seat surface of the flange portion and the end surface of the washer in contact with each other, and bring the outer peripheral surface of the flange portion and the outer peripheral surface of the washer toward the radial center. Press and hold. Thus, the flange portion and the washer are stably held because they are held in two directions by the engaging member. Then, when the seat surface of the flange portion is formed in a direction substantially orthogonal to the axial direction of the bolt insertion hole and brought into contact with the end surface of the washer, the flange portion and the washer are in the axial direction of the bolt insertion hole by the engaging member. And it is hold | maintained in both directions of a radial direction (direction orthogonal to an axial direction), and simplification of a structure is achieved.
[0015]
Furthermore, the engaging member in the wheel nut or the wheel bolt is constituted by an annular member straddling the outer peripheral surface of the flange portion and the outer peripheral surface of the washer, and the inner surface of the annular member simultaneously engages and holds these outer peripheral surfaces from the outside. Is desirable. By using such an annular member, the cost can be further reduced, and it becomes difficult to come off from the flange portion and the washer. The annular member can be constituted by a retaining ring, a coil spring or the like.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
First, a reference example of a wheel nut which is a premise of the present invention will be described with reference to FIGS.
When using a washer having a tapered outer peripheral surface (tapered washer) as shown in FIG. 13, the following adjustment is required in the manufacturing and assembling process of the wheel nut 500.
(1) Adjustment of fitting (contact) accuracy between the seating surface 512a of the flange portion 512 of the nut body 510 and the outer end surface 520a of the washer 520;
(2) Adjustment of fitting (contact) accuracy between the tapered enlarged surface 502b of the bolt insertion hole of the disc wheel 502 and the tapered outer peripheral surface 520b of the washer 520;
(3) The outer peripheral surface 515a of the cylindrical portion 515 of the nut main body 510 in which the female screw portion 511 is formed on the inner side, and the inner peripheral surface 520c of the cylindrical portion of the washer 520 fitted on the cylindrical portion 515 of the nut main body 510 Adjustment of mating (contact) accuracy with
[0017]
And in the case of a wheel nut using a tapered washer, there are many cases in which the adjustment of the above (3) is not sufficient and is a defective product. Therefore, as shown in FIGS. 13 to 15, an engaging portion can be provided between the nut main body 510 (the cylindrical portion 515 thereof) and the washer 520. In the wheel nut 500 of FIG. 13, the concave portion 515 b is provided on the outer peripheral surface 515 a side of the cylindrical portion 515 of the nut body 510, and the convex portion 520 d protruding toward the inner peripheral surface 520 c side of the washer 520 is fitted to adjust the position. . Further, in the wheel nut 550 of FIG. 14, an uneven portion 515 c such as a knurling, serration, spline or the like is formed on the outer peripheral surface 515 a side of the cylindrical portion 515 of the nut body 510, and formed on the inner peripheral surface 520 c side of the washer 520. It is made to fit with the groove part 520e. Further, in the wheel nut 560 of FIG. 15, the cylindrical portion of the nut main body 510 is eliminated, the projection 512b is provided on the flange portion 512, and the recess portion 520f formed on the inner peripheral surface 520c side of the washer 520 is fitted.
[0018]
In these wheel nuts 500, 550, and 560, it is of course possible to increase the processing accuracy of the engaging portion provided between the nut main body 510 (the cylindrical portion 515) and the washer 520. However, if the accuracy of the three fittings shown in the above (1) to (3) is not satisfied at the same time, the bending force acts on the wheel bolt, which may cause the wheel nut to loosen or break the wheel bolt. is there. Further, between the nut main body 510 and the washer 520, there are a recess 515b / projection 520d (FIG. 13), a recess / protrusion 515c / groove 520e (FIG. 14), and a protrusion 512b / depression 520f (FIG. 15). It is necessary to provide a joint, and it is difficult to share with conventional parts. Therefore, in the present invention, the basic configuration of the wheel nut (or wheel bolt) is changed, for example, as in the embodiment described below.
[0019]
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings.
(Example 1)
FIG. 1 is a front half sectional view showing an embodiment when the wheel nut of the present invention is used in combination with a wheel bolt. A wheel nut 100 shown in FIG. 1 is used to fasten a hub 1 and a disc wheel 2 on the vehicle body side of an automobile or the like that are arranged to face each other. The disc wheel 2 is formed with a predetermined number of tapered bolt insertion holes 2 a that expand toward the opposite side of the hub 1. That is, each bolt insertion hole 2a has a cylindrical hole formed on the hub 1 side, and subsequently a conical (or truncated cone-shaped) hole extending on the opposite side (the vehicle body outer side) from the hub 1 side. Have. Further, the hub 1 is formed with a through hole 1a and a groove 1b that share the bolt insertion hole 2a and the axis O. The wheel bolt 3 is inserted from the through hole 1a, and an uneven portion 3b formed on the outer periphery on the proximal end side of the shaft-shaped portion 3a is fitted to the groove portion 1b. The uneven portion 3b formed on the shaft-shaped portion 3a of the wheel bolt 3 is, for example, knurl, serration, spline, etc., and the wheel bolt 3 cannot rotate into the hub 1 by press-fitting the uneven portion 3b into the groove portion 1b. Fixed to.
[0020]
As shown in FIG. 2, the wheel nut 100 includes a nut body 10, a washer 20, and a C-shaped retaining ring 30 (annular member; engagement member). Among these, the nut body 10 includes a female screw portion 11 that is screwed with a male screw portion 3c (see FIG. 1) formed on the tip end side of the shaft-like portion 3a of the wheel bolt 3 inserted from the hub 1 side into the bolt insertion hole 2a. And a flange portion 12 for receiving a fastening force by screwing with the wheel bolt 3. In addition, in the inside of the nut main body 10, the screwable length of the female screw portion 11 and the male screw portion 3c is made relatively large, and thereby, the cylindrical portion of the nut main body 10 from the flange portion 12 (the seat surface 12a thereof). The protrusion is lost.
[0021]
The washer 20 is formed in a trapezoidal shape in a half section including the axis O (see FIG. 1) of the bolt insertion hole 2 a and is located between the disc wheel 2 and the nut body 10. That is, the washer 20 has a tapered washer having an end surface 20a that contacts the seating surface 12a of the flange portion 12 of the nut body 10 and a tapered outer peripheral surface 20b that contacts the tapered diameter-expanded surface 2b of the bolt insertion hole 2a. Is configured.
[0022]
The C-shaped retaining ring 30 has a function of engaging and holding both from the outside across the nut body 10 and the washer 20. Specifically, the C-shaped retaining ring 30 holds the bearing surface 12a of the flange portion 12 and the end surface 20a of the washer 20 in contact with each other, and connects the outer peripheral surface 12b of the flange portion 12 and the tapered outer peripheral surface 20b of the washer 20 with each other. Each is pressed and held toward the center in the radial direction. More specifically, the C-shaped retaining ring 30 is configured to straddle the outer peripheral surface 12b of the flange portion 12 and the tapered outer peripheral surface 20b of the washer 20, and the inner surface 30a extends outside these outer peripheral surfaces 12b and 20b. Are engaged and held at the same time.
[0023]
In the nut body 10, the seat surface 12 a of the flange portion 12 is formed in a direction substantially orthogonal to the direction of the axis O of the bolt insertion hole 2 a and is in contact with the end surface 20 a of the washer 20. Reference numeral 13 denotes a hexagonal portion that engages with a tool such as a spanner. Reference numeral 14 denotes a cap that covers the female screw portion 11 from the front end opening side (the outermost side of the vehicle body) in order to impart a dustproof effect or a decorative effect.
[0024]
Next, a method for assembling the wheel nut 100 and a method for fastening the hub 1 and the disc wheel 2 will be described.
(1) Assembly method of wheel nut 100 (see FIG. 2)
As shown in FIG. 2, the nut body 10, the washer 20 and the C-shaped retaining ring 30 are manufactured in the same process as before. The cap 14 is fixed to the nut body 10 by welding, caulking or the like. Then, the seat surface 12a of the flange portion 12 of the nut body 10 and the end surface 20a of the washer 20 are aligned, and the C-shaped retaining ring 30 is aligned with the outer peripheral surface 12b of the flange portion 12 and the tapered outer peripheral surface 20b of the washer 20. Engage and hold from the outside to straddle. At this time, since the cylindrical part which protrudes from the seating surface 12a of the flange part 12 in the nut main body 10 is omitted, the outer peripheral surface of the cylindrical part of the nut main body 10 and the inner peripheral surface 20c of the cylindrical part of the washer 20 It is not necessary to fit (contact) by caulking or the like.
[0025]
(2) Fastening method between hub 1 and disc wheel 2 (see FIG. 1)
The wheel bolt 3 is inserted into the through hole 1a of the hub 1, and the uneven portion 3b is press-fitted and fixed in the groove portion 1b. The female threaded portion 11 of the nut body 10 is screwed into the male threaded portion 3c of the wheel bolt 3 inserted through the bolt insertion hole 2a, and the tapered enlarged surface 2b of the bolt insertion hole 2a of the disc wheel 2 and the tapered shape of the washer 20 are formed. The fitting (contact) position with the outer peripheral surface 20b is adjusted. As described above, the tapered enlarged surface 2b of the bolt insertion hole 2a and the tapered outer peripheral surface of the washer 20 are based on the alignment between the seating surface 12a of the flange portion 12 and the end surface 20a of the washer 20 when the wheel nut 100 is assembled. What is necessary is just to adjust the fitting (contact) position with 20b. As a result, the hub 1 and the disc wheel 2 are fastened with high precision, and the wheel nut 100 is not loosened and the wheel bolt 3 is not easily broken.
[0026]
As described above, the C-shaped retaining ring 30 holds the bearing surface 12a of the flange portion 12 and the end surface 20a of the washer 20 in contact with each other, and the outer peripheral surface 12b of the flange portion 12 and the tapered outer peripheral surface 20b of the washer 20 have radii. Pressing and holding toward the center of the direction. The inner surface 30a of the C-shaped retaining ring 30 simultaneously engages and holds the outer peripheral surface 12b of the flange portion 12 and the tapered outer peripheral surface 20b of the washer 20 from the outside. Since the flange portion 12 and the washer 20 are simultaneously held in two directions by the C-shaped retaining ring 30, the holding is stable and is difficult to come off.
[0027]
(Modification 1)
3 and 4 show a modification of the wheel nut. In this wheel nut 200, the following changes are added to Example 1 (FIGS. 1 and 2).
(1) In the nut body 110, the seat surface 112a of the flange portion 112 is provided so as to be inclined toward the wheel bolt 3 side without being orthogonal to the direction of the axis O of the bolt insertion hole 2a. Accordingly, the end face 120a of the washer 120 is also inclined in the same direction and is in contact (fitted) with the seat face 112a. By providing an inclination (taper) on the seating surface 112a of the flange portion 112, (a) the screwing length between the female screw portion 11 and the male screw portion 3c can be made relatively long, and the nut body 110 and the wheel bolt 3 (B) The contact area between the seat surface 112a and the end surface 120a of the washer 120 can be made relatively large, and the effect of preventing the washer 120 from rotating is increased. The taper angle β of the end surface 120a of the washer 120 (or the seat surface 112a of the flange portion 112) is larger than the taper angle α of the outer peripheral surface 20b of the washer 120 (or the enlarged surface 2b of the disk wheel 2). It is formed (see FIG. 4).
(2) A coil spring 130 (annular member; engagement member) is provided in place of the C-shaped retaining ring. Since the expansion / contraction ratio of the diameter can be increased by the spring force of the coil spring 130, the assembly of the wheel nut 200 is facilitated.
[0028]
Accordingly, even in this case, the taper-shaped enlarged surface 2b of the bolt insertion hole 2a and the taper of the washer 120 are based on the alignment between the seating surface 112a of the flange portion 112 and the end surface 120a of the washer 120 when the wheel nut 200 is assembled. The fitting (contact) position with the outer peripheral surface 20b is adjusted. The coil spring 130 holds the seat surface 112a of the flange portion 112 and the end surface 120a of the washer 120 in contact with each other, and the outer peripheral surface 12b of the flange portion 112 and the tapered outer peripheral surface 20b of the washer 120 are moved toward the radial center. Press and hold. Further, the inner surface 130a of the coil spring 130 simultaneously engages and holds the outer peripheral surface 12b of the flange portion 112 and the tapered outer peripheral surface 20b of the washer 120 from the outside.
[0029]
(Modification 2)
5 and 6 show another modification of the wheel nut. In the wheel nut 300, the following changes are made to the first embodiment (FIGS. 1 and 2).
(1) In the nut main body 210, a cylindrical portion 215 is formed so as to protrude from the seating surface 12 a of the flange portion 212, and this cylindrical portion 215 is inserted into the cylindrical portion of the washer 220. The outer peripheral surface 215a of the cylindrical portion 215 of the flange portion 212 and the inner peripheral surface 20c of the cylindrical portion of the washer 220 are not fitted (contacted) by caulking or the like. By providing the cylindrical portion 215, the screwing length between the female screw portion 11 and the male screw portion 3c can be made relatively long, and the fastening of the nut body 210 and the wheel bolt 3 is stabilized.
(2) A circular ring 230 (annular member; engagement member) having a rectangular cross section is provided instead of the C-shaped retaining ring. The circular ring 230 is fitted into recesses 212d and 220d (groove portions) formed on the flange portion 212 (outer peripheral surface 12b) of the nut body 210 and the outer peripheral surface 20b of the washer 220 by an interference fit such as shrink fitting. Yes. Since the circular ring 230 is embedded in the recesses 212d and 220d and does not protrude from the outer surface, the circular ring 230 is difficult to come into contact with other objects.
[0030]
Therefore, also in this case, the taper-shaped enlarged surface 2b of the bolt insertion hole 2a and the taper of the washer 220 are based on the alignment between the seat surface 12a of the flange portion 212 and the end surface 20a of the washer 220 when the wheel nut 300 is assembled. The fitting (contact) position with the outer peripheral surface 20b is adjusted. The circular ring 230 holds the bearing surface 12a of the flange portion 212 and the end surface 20a of the washer 220 in contact with each other, and the outer peripheral surface 12b of the flange portion 212 and the tapered outer peripheral surface 20b of the washer 220 are respectively directed toward the center in the radial direction. Press and hold. The inner surface 230a of the circular ring 230 simultaneously engages and holds the outer peripheral surface 12b of the flange portion 212 and the tapered outer peripheral surface 20b of the washer 220 from the outside.
[0031]
In Modification 1 (FIGS. 3 and 4) and Modification 2 (FIGS. 5 and 6), parts having the same functions as those in Embodiment 1 (FIGS. 1 and 2) are denoted by the same reference numerals. Description is omitted.
[0032]
(Example 2)
FIG. 7 is a front half sectional view showing an embodiment in which the wheel bolt of the present invention is used. The wheel bolt 180 shown in FIG. 7 is used for fastening the hub 1 and the disc wheel 2 on the vehicle body side of an automobile or the like, which are arranged to face each other. The disc wheel 2 is formed with a predetermined number of tapered bolt insertion holes 2 a that expand toward the opposite side of the hub 1. That is, each bolt insertion hole 2a has a cylindrical hole formed on the hub 1 side, and subsequently a conical (or truncated cone-shaped) hole extending on the opposite side (the vehicle body outer side) from the hub 1 side. Have. Further, the hub 1 is formed with a female screw portion 1c that shares the bolt insertion hole 2a with the axis O.
[0033]
As shown in FIG. 8, the wheel bolt 180 includes a bolt body 50, a washer 60, and a C-shaped retaining ring 70 (annular member; engagement member). Among these, the bolt main body 50 receives the fastening force by the screwing of the female screw part 1c with the male screw part 1c (see FIG. 7) inserted into the bolt insertion hole 2a and screwed with the female screw part 1c (see FIG. 7). And a flange portion 52. In the bolt main body 50, the threadable length between the male threaded portion 51 and the female threaded portion 1c is made relatively large, thereby projecting the cylindrical portion of the bolt main body 50 from the flange portion 52 (the seating surface 52a). It is lost.
[0034]
The washer 60 is formed in a trapezoidal shape in a half section including the axis O (see FIG. 7) of the bolt insertion hole 2a, and is located between the disc wheel 2 and the bolt main body 50. That is, the washer 60 has a tapered washer having an end surface 60a that contacts the seating surface 52a of the flange portion 52 of the bolt body 50 and a tapered outer peripheral surface 60b that contacts the tapered diameter-expanded surface 2b of the bolt insertion hole 2a. Is configured.
[0035]
The C-shaped retaining ring 70 has a function of engaging and holding both from the outside across the bolt body 50 and the washer 60. Specifically, the C-shaped retaining ring 70 holds the bearing surface 52a of the flange portion 52 and the end surface 60a of the washer 60 in contact with each other, and connects the outer peripheral surface 52b of the flange portion 52 and the tapered outer peripheral surface 60b of the washer 60. Each is pressed and held toward the center in the radial direction. More specifically, the C-shaped retaining ring 70 is configured to straddle the outer peripheral surface 52b of the flange portion 52 and the tapered outer peripheral surface 60b of the washer 60, and the inner surface 70a extends outside these outer peripheral surfaces 52b and 60b. Are engaged and held at the same time.
[0036]
In the bolt body 50, the seating surface 52a of the flange portion 52 is formed in a direction substantially orthogonal to the direction of the axis O of the bolt insertion hole 2a and is in contact with the end surface 60a of the washer 60. Reference numeral 53 denotes a hexagonal portion that engages with a tool such as a spanner.
[0037]
Next, a method for assembling the wheel bolt 180 and a method for fastening the hub 1 and the disc wheel 2 will be described.
(1) Assembly method of wheel bolt 180 (see FIG. 8)
As shown in FIG. 8, the bolt body 50, the washer 60, and the C-shaped retaining ring 70 are manufactured in the same process as in the prior art. Then, the bearing surface 52a of the flange portion 52 of the bolt body 50 and the end surface 60a of the washer 60 are aligned, and the C-shaped retaining ring 70 is aligned with the outer peripheral surface 52b of the flange portion 52 and the tapered outer peripheral surface 60b of the washer 60. Engage and hold from the outside to straddle. At this time, since the cylindrical portion protruding from the seating surface 52a of the flange portion 52 is omitted in the bolt main body 50, the outer peripheral surface of the shaft-shaped portion of the bolt main body 50 and the inner peripheral surface 60c of the cylindrical portion of the washer 60 It is not necessary to fit (contact) by caulking or the like.
[0038]
(2) Fastening method between hub 1 and disc wheel 2 (see FIG. 7)
The wheel bolt 180 is inserted into the bolt insertion hole 2a, the male screw portion 51 of the bolt main body 50 is screwed into the female screw portion 1c formed in the hub 1, and the tapered enlarged surface 2b of the bolt insertion hole 2a of the disc wheel 2 The fitting (contact) position of the washer 60 with the tapered outer peripheral surface 60b is adjusted. Thus, with reference to the alignment between the seating surface 52a of the flange portion 52 and the end surface 60a of the washer 60 when the wheel bolt 180 is assembled, the tapered enlarged surface 2b of the bolt insertion hole 2a and the tapered outer peripheral surface of the washer 60. What is necessary is just to adjust the fitting (contact) position with 60b. As a result, the hub 1 and the disc wheel 2 are fastened with high accuracy, and the wheel bolt 180 is less likely to be loosened or broken.
[0039]
As described above, the C-shaped retaining ring 70 holds the bearing surface 52a of the flange portion 52 and the end surface 60a of the washer 60 in contact with each other, and the outer peripheral surface 52b of the flange portion 52 and the tapered outer peripheral surface 20b of the washer 60 have radii, respectively. Pressing and holding toward the center of the direction. The inner surface 70a of the C-shaped retaining ring 70 simultaneously engages and holds the outer peripheral surface 52b of the flange portion 52 and the tapered outer peripheral surface 60b of the washer 60 from the outside. Since the flange 52 and the washer 60 are simultaneously held in two directions by the C-shaped retaining ring 70, the holding is stable and is difficult to come off.
[0040]
(Modification 3)
9 and 10 show a modification of the wheel bolt. In the wheel bolt 280, the following changes are added to the second embodiment (FIGS. 7 and 8).
(1) In the bolt main body 150, the seat surface 152a of the flange portion 152 is provided so as to be inclined to the tip side of the shaft-like portion without being orthogonal to the direction of the axis O of the bolt insertion hole 2a. Accordingly, the end face 160a of the washer 160 is also inclined in the same direction and is in contact (fitted) with the seat face 152a. By providing the seating surface 152a of the flange portion 152 with an inclination (taper), the contact area between the seating surface 152a and the end surface 160a of the washer 160 can be made relatively large, and the effect of preventing the washer 160 from rotating is increased. Note that the taper angle β of the end surface 160a of the washer 160 (or the seat surface 152a of the flange 152) is larger than the taper angle α of the outer peripheral surface 60b of the washer 160 (or the enlarged diameter surface 2b of the disc wheel 2). It is formed (see FIG. 10).
(2) A coil spring 170 (annular member; engaging member) is provided instead of the C-shaped retaining ring. Since the expansion / contraction ratio of the diameter can be increased by the spring force of the coil spring 170, the wheel bolt 280 can be easily assembled.
[0041]
Therefore, also in this case, the taper-shaped enlarged surface 2b of the bolt insertion hole 2a and the taper of the washer 160 are based on the alignment between the seating surface 152a of the flange portion 152 and the end surface 160a of the washer 160 when the wheel bolt 280 is assembled. The fitting (contact) position with the outer peripheral surface 60b is adjusted. The coil spring 170 holds the bearing surface 152a of the flange portion 152 and the end surface 160a of the washer 160 in contact with each other, and the outer peripheral surface 52b of the flange portion 152 and the tapered outer peripheral surface 60b of the washer 160 are respectively directed toward the radial center. Press and hold. Further, the inner surface 170a of the coil spring 170 simultaneously engages and holds the outer peripheral surface 52b of the flange portion 152 and the tapered outer peripheral surface 60b of the washer 160 from the outside.
[0042]
(Modification 4)
11 and 12 show another modification of the wheel bolt. In the wheel bolt 380, the following changes are added to the second embodiment (FIGS. 7 and 8).
(1) In the bolt main body 250, a shaft-shaped portion 255 is formed so as to protrude from the seating surface 52 a of the flange portion 252, and this shaft-shaped portion 255 is inserted into the tubular portion of the washer 260. The outer peripheral surface 255a of the shaft-shaped portion 255 of the flange portion 252 and the inner peripheral surface 60c of the cylindrical portion of the washer 260 are not fitted (contacted) by caulking or the like. By providing the shaft-shaped portion 255, the strength of the bolt body 250 is increased.
(2) A circular ring 270 (annular member; engagement member) having a rectangular cross section is provided instead of the C-shaped retaining ring. The circular ring 270 is fitted into recesses 252d and 260d (groove portions) formed on the flange portion 252 (outer peripheral surface 52b) of the bolt body 250 and the outer peripheral surface 60b of the washer 260 by an interference fit such as shrink fitting. Yes. Since the circular ring 270 is embedded in the recesses 252d and 260d and does not protrude from the outer surface, the circular ring 270 does not easily come into contact with other objects.
[0043]
Accordingly, even in this case, the tapered enlarged surface 2b of the bolt insertion hole 2a and the taper of the washer 260 are based on the alignment between the seating surface 52a of the flange portion 252 and the end surface 60a of the washer 260 when the wheel bolt 380 is assembled. The fitting (contact) position with the outer peripheral surface 60b is adjusted. The circular ring 270 holds the seating surface 52a of the flange portion 252 and the end surface 60a of the washer 260 in contact with each other, and the outer peripheral surface 52b of the flange portion 252 and the tapered outer peripheral surface 60b of the washer 260 are moved toward the center in the radial direction. Press and hold. Also, the inner surface 270a of the circular ring 270 engages and holds the outer peripheral surface 52b of the flange portion 252 and the tapered outer peripheral surface 60b of the washer 260 simultaneously from the outside.
[0044]
In Modification 3 (FIGS. 9 and 10) and Modification 4 (FIGS. 11 and 12), parts having the same functions as those in Embodiment 2 (FIGS. 7 and 8) are denoted by the same reference numerals. Description is omitted.
[0045]
As long as the half cross-sectional shape of the washer (tapered washer) is relatively long in the axial direction as compared with the flat washer, various shapes other than the trapezoidal shape and the triangular shape can be used.
[Brief description of the drawings]
FIG. 1 is a front half sectional view showing an embodiment when the wheel nut of the present invention is used in combination with a wheel bolt.
2 is a front exploded half sectional view of the wheel nut of FIG. 1. FIG.
FIG. 3 is a front half sectional view showing a modified example of the wheel nut of FIG. 1;
4 is a front exploded half sectional view of the wheel nut of FIG. 3;
FIG. 5 is a front half sectional view showing another modification of the wheel nut of FIG. 1;
6 is a front exploded half sectional view of the wheel nut of FIG. 5;
FIG. 7 is a front half sectional view showing an embodiment when the wheel bolt of the present invention is used.
8 is a front exploded half sectional view of the wheel bolt of FIG. 7;
9 is a front half sectional view showing a modification of the wheel bolt of FIG. 7;
10 is a front exploded half sectional view of the wheel bolt of FIG. 9;
11 is a front half sectional view showing another modified example of the wheel bolt of FIG. 7;
12 is a front exploded half sectional view of the wheel bolt of FIG. 11;
FIG. 13 is a front half sectional view showing a reference example of a wheel nut as a premise of the present invention.
FIG. 14 is a front half sectional view showing a reference example of the wheel nut following FIG. 13;
15 is a front half sectional view showing a reference example of the wheel nut following FIG. 14;
[Explanation of symbols]
1 Hub
2 Disc wheel
2a Bolt insertion hole
2b Expanded surface
10 Nut body
11 Female thread
12 Flange
12a Seat
20 washer
20a end face
20b outer peripheral surface
30 C-shaped retaining ring (annular member; engaging member)
130 Coil spring (annular member; engagement member)
230 Circular ring (annular member; engagement member)
100, 200, 300 Wheel nut

Claims

A wheel nut for fastening a disc wheel formed with a bolt insertion hole having a diameter expanding toward a side opposite to a hub on the vehicle body side disposed opposite to the hub,
A nut main body having a female screw portion screwed with a male screw portion of a wheel bolt inserted through the bolt insertion hole from the hub side, and a flange portion receiving a fastening force by screwing with the wheel bolt;
A washer positioned between the disk wheel and the nut body, and having an end surface that contacts a seating surface of the flange portion of the nut body and an outer peripheral surface that contacts an enlarged surface of the bolt insertion hole;
An engaging member that engages and holds both from the outside across the nut body and the washer;
Wheel nut characterized by including.

The engaging member holds the seat surface of the flange portion and the end surface of the washer in contact with each other, and presses and holds the outer peripheral surface of the flange portion and the outer peripheral surface of the washer toward the radial center. Item 14. A wheel nut according to Item 1.

The wheel nut according to claim 1 or 2, wherein a seating surface of the flange portion is formed in a direction substantially orthogonal to an axial direction of the bolt insertion hole and is in contact with an end surface of the washer.

The said engaging member is comprised by the annular member straddling the outer peripheral surface of the said flange part, and the outer peripheral surface of the said washer, and the inner surface of this annular member is engaging and holding these outer peripheral surfaces simultaneously from the outer side. The wheel nut of any one of thru | or 3.

The wheel nut according to claim 4, wherein the annular member is configured by a retaining ring.

The wheel nut according to claim 4, wherein the annular member is configured by a coil spring.

A wheel bolt for fastening a disc wheel formed with a bolt insertion hole having a diameter expanding toward a side opposite to a vehicle body side hub disposed opposite to the hub,
A bolt main body having a male screw portion that is inserted into the bolt insertion hole and screwed with a female screw portion formed in the hub, and a flange portion that receives a fastening force by screwing with the female screw portion;
A washer positioned between the disk wheel and the bolt body, and having an end surface that contacts a seating surface of a flange portion of the bolt body and an outer peripheral surface that contacts an enlarged surface of the bolt insertion hole;
An engagement member that engages and holds both from the outside across the bolt body and the washer;
A wheel bolt characterized by including.

The engaging member holds the seat surface of the flange portion and the end surface of the washer in contact with each other, and presses and holds the outer peripheral surface of the flange portion and the outer peripheral surface of the washer toward the radial center. Item 8. The wheel bolt according to Item 7.

The wheel bolt according to claim 7 or 8, wherein a seating surface of the flange portion is formed in a direction substantially orthogonal to an axial direction of the bolt insertion hole and is in contact with an end surface of the washer.

The said engaging member is comprised by the annular member straddling the outer peripheral surface of the said flange part, and the outer peripheral surface of the said washer, and the inner surface of this annular member engages and holds these outer peripheral surfaces simultaneously from the outer side. The wheel bolt of any one of thru | or 9.

The wheel bolt according to claim 10, wherein the annular member is configured by a retaining ring.

The wheel bolt according to claim 10, wherein the annular member is configured by a coil spring.