JP2001241554A - Sealing device of shock-absorber for vehicle - Google Patents
Sealing device of shock-absorber for vehicleInfo
- Publication number
- JP2001241554A JP2001241554A JP2000052753A JP2000052753A JP2001241554A JP 2001241554 A JP2001241554 A JP 2001241554A JP 2000052753 A JP2000052753 A JP 2000052753A JP 2000052753 A JP2000052753 A JP 2000052753A JP 2001241554 A JP2001241554 A JP 2001241554A
- Authority
- JP
- Japan
- Prior art keywords
- main body
- tube
- diameter hole
- sealing device
- inner tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は二輪車等のフロント
フォークに用いて好適な車両用緩衝器の密封装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle shock absorber sealing device suitable for use in a front fork of a motorcycle or the like.
【0002】[0002]
【従来の技術】従来、二輪車用フロントフォークの密封
装置として、特開平9-287665号公報に記載の如く、アウ
タチューブのインナチューブが挿入される開口端に設け
たオイルシールケース部の軸方向内側にオイルシールを
装填し、該オイルシールケース部の軸方向外側にダスト
シールを装填するものが開示されている。この従来技術
では、ダストシールの本体部(金属製補強環)に形成し
た係合部を、オイルシールケース部に設けた凹溝に係合
することにより、ダストシールをオイルシールケース部
に離脱することなく固定できる。また、ダストシールに
よりオイルシールを上から押さえ、オイルシールをスト
ッパリング等の固定部材を用いずに固定できる。2. Description of the Related Art Conventionally, as a sealing device for a front fork for a motorcycle, as disclosed in Japanese Patent Application Laid-Open No. 9-287665, an axially inner side of an oil seal case portion provided at an opening end of an outer tube into which an inner tube is inserted. An oil seal is mounted on the oil seal case, and a dust seal is mounted on the outside of the oil seal case in the axial direction. In this conventional technique, the engaging portion formed on the main body portion (metal reinforcing ring) of the dust seal is engaged with the concave groove provided on the oil seal case portion, so that the dust seal does not detach from the oil seal case portion. Can be fixed. Further, the oil seal is pressed from above by the dust seal, and the oil seal can be fixed without using a fixing member such as a stopper ring.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、従来技
術では、ダストシールとオイルシールが別体であり、こ
の点において部品点数が多く、組付工数も多くなるた
め、製品コストが高い。However, in the prior art, the dust seal and the oil seal are separate parts, and in this respect, the number of parts and the number of assembling steps are increased, so that the product cost is high.
【0004】本発明の課題は、アウタチューブの開口端
にオイルシール機構とダストシール機構を設けるに際
し、部品点数と組付工数を削減し、製品コストを低減す
ることにある。[0004] It is an object of the present invention to reduce the number of parts and the number of assembling steps when installing an oil seal mechanism and a dust seal mechanism at the open end of an outer tube, thereby reducing product cost.
【0005】[0005]
【課題を解決するための手段】請求項1に記載の本発明
は、アウタチューブにインナチューブを摺動自在に挿入
し、アウタチューブとインナチューブの内部に作動油を
封入して構成され、アウタチューブのインナチューブが
挿入される開口端に、第1の大径孔と、第1の大径孔よ
り軸方向外側に設けられた該第1の大径孔より大内径の
第2の大径孔と、第2の大径孔の内周に設けられた凹溝
を備え、アウタチューブの上記開口端に装着される車両
用緩衝器の密封装置であって、環状の本体部と、本体部
の軸方向外側部から径方向外方に該本体部との間に隙間
を介して折曲げ形成された、径方向に弾性的に拡縮して
第2の大径孔に嵌合し得る環状の弾性部と、弾性部から
径方向外方に折曲げ形成され、凹溝に係合し得る係合部
と、本体部の軸方向内側部を該本体部の内周側に折曲げ
形成した環状の支持部と、支持部に設けた、インナチュ
ーブの外周に摺接する内周側オイルシールリップ部と、
本体部の軸方向内側の外周部に設けた、第1の大径孔に
嵌合する外周側オイルシール部と、本体部の軸方向外側
の内周部に設けた、インナチューブの外周に摺接する内
周側ダストシールリップ部とを有してなるようにしたも
のである。According to a first aspect of the present invention, an inner tube is slidably inserted into an outer tube, and hydraulic oil is sealed inside the outer tube and the inner tube. A first large-diameter hole at an open end of the tube into which the inner tube is inserted, and a second large-diameter hole having an inner diameter larger than the first large-diameter hole provided outside the first large-diameter hole in the axial direction. A sealing device for a shock absorber for a vehicle, comprising a hole, a concave groove provided on an inner periphery of a second large-diameter hole, and mounted on the open end of the outer tube, comprising: an annular main body; An annular shape formed by bending a radially outward portion from the axially outer portion with the main body portion with a gap interposed therebetween and elastically expanding and contracting in the radial direction so as to fit into the second large-diameter hole. An elastic portion, an engaging portion bent radially outward from the elastic portion and capable of engaging with the concave groove, and an axial direction of the main body portion. A supporting portion of the annular and bent forming the inner portion on the inner peripheral side of the body portion, provided on the support portion, and the inner side oil seal lip in sliding contact with the outer periphery of the inner tube,
An outer peripheral oil seal portion fitted to the first large-diameter hole is provided on an outer peripheral portion on the inner side in the axial direction of the main body portion, and slides on an outer peripheral portion of the inner tube provided on an inner peripheral portion on the outer axial side of the main body portion. And an inner-peripheral-side dust seal lip portion in contact therewith.
【0006】請求項2に記載の本発明は、請求項1に記
載の本発明において更に、前記弾性部の外周部に設け
た、第2の大径孔に嵌合する外周側ダストシール部を有
してなるようにしたものである。According to a second aspect of the present invention, in addition to the first aspect of the present invention, there is further provided an outer peripheral side dust seal portion provided in an outer peripheral portion of the elastic portion and fitted to a second large-diameter hole. It is made to be.
【0007】請求項3に記載の本発明は、アウタチュー
ブにインナチューブを摺動自在に挿入し、アウタチュー
ブとインナチューブの内部に作動油を封入して構成さ
れ、アウタチューブのインナチューブが挿入される開口
端に、大径孔と、大径孔の内周に設けられた凹溝を備
え、アウタチューブの上記開口端に装着される車両用緩
衝器の密封装置であって、大径孔に嵌合し得る環状の本
体部と、本体部から径方向外方に切欠形成され、径方向
に弾性的に拡縮して凹溝に係合し得る係合部と、本体部
の軸方向内側部を該本体部の内周側に折曲げ形成した環
状の支持部と、支持部に設けた、インナチューブの外周
に摺接する内周側オイルシールリップ部と、本体部の軸
方向内側の外周部に設けた、大径孔に嵌合する外周側オ
イルシール部と、本体部の軸方向外側の内周部に設け
た、インナチューブの外周に摺接する内周側ダストシー
ルリップ部とを有してなるようにしたものである。According to a third aspect of the present invention, the inner tube is slidably inserted into the outer tube, and hydraulic oil is sealed inside the outer tube and the inner tube. The inner tube of the outer tube is inserted. A sealing device for a shock absorber for a vehicle, which is provided with a large-diameter hole and a concave groove provided on the inner periphery of the large-diameter hole at the open end to be attached to the open end of the outer tube. An annular main body, a notch formed radially outward from the main body, elastically expanding and contracting in the radial direction to engage with the concave groove, and an axial inner side of the main body. An annular support portion formed by bending a portion on the inner peripheral side of the main body portion; an inner peripheral side oil seal lip portion provided on the support portion for sliding contact with the outer periphery of the inner tube; and an outer peripheral portion of the main body portion in the axial direction. Outer peripheral side oil seal part fitted to the large diameter hole, Provided on the inner periphery of the axially outer, it is obtained by the so and an inner peripheral side dust seal lip portion in sliding contact with the outer periphery of the inner tube.
【0008】請求項4に記載の本発明は、請求項3に記
載の本発明において更に、前記本体部の軸方向外側の外
周部に設けた、大径孔に嵌合する外周側ダストシール部
を有してなるようにしたものである。According to a fourth aspect of the present invention, in addition to the third aspect of the present invention, an outer peripheral side dust seal portion fitted to a large-diameter hole is provided on an outer peripheral portion of the main body portion on the outer side in the axial direction. It is intended to have.
【0009】請求項5に記載の本発明は、請求項1〜4
のいずれかに記載の本発明において更に、前記支持部
が、本体部の軸方向内側端を、該本体部の内周に接する
ように折曲げ、その折曲げの先端部を径方向内方に折曲
げて形成されるようにしたものである。The present invention according to claim 5 provides the invention according to claims 1-4.
In the present invention described in any one of the above, further, the support portion may bend the axially inner end of the main body portion so as to be in contact with the inner periphery of the main body portion, and the distal end portion of the bending may be radially inward. It is formed by bending.
【0010】請求項6に記載の本発明は、請求項1〜4
のいずれかに記載の本発明において更に、前記支持部
が、本体部の軸方向内側中間部を、径方向内方に折曲げ
て形成されるようにしたものである。The present invention described in claim 6 provides the invention according to claims 1-4.
In the present invention described in any one of the above, the support portion may be formed by bending an axially intermediate portion of the main body portion inward in the radial direction.
【0011】[0011]
【作用】請求項1の発明によれば下記、の作用があ
る。 内周側オイルシールリップ部と外周側オイルシール部
と内周側ダストシールリップ部を備えた密封装置を、ア
ウタチューブの開口端に装着するに際し、弾性部の係合
部をアウタチューブの第2の大径孔にあて、弾性部を縮
径させた状態で、該係合部を第2の大径孔に滑らせて凹
溝に係合させた後、弾性部を弾性的に復元させて拡径せ
しめることにより、この密封装置をストッパリング等の
固定部材を用いることなく開口端から抜け止め可能とし
て、強固に固定できる。According to the first aspect of the present invention, the following operations are provided. When a sealing device having an inner peripheral side oil seal lip portion, an outer peripheral side oil seal portion, and an inner peripheral side dust seal lip portion is attached to the open end of the outer tube, the engaging portion of the elastic portion is connected to the second portion of the outer tube. The engaging portion is slid into the second large-diameter hole to engage the concave groove with the elastic portion reduced in diameter against the large-diameter hole, and then the elastic portion is elastically restored to expand. By making the diameter smaller, the sealing device can be securely fixed from the opening end without using a fixing member such as a stopper ring.
【0012】密封装置は、内周側オイルシールリップ
部と外周側オイルシール部と内周側ダストシールリップ
部を併せ備えるから、内周側オイルシールリップ部がイ
ンナチューブに液密に摺接し、外周側オイルシール部が
アウタチューブの第1の大径孔に液密に嵌合するオイル
シール機構と、内周側ダストシール部がインナチューブ
に摺接するダストシール機構とが別体になることなく、
部品点数と組付工数を削減し、製品コストを低減でき
る。Since the sealing device is provided with the inner peripheral oil seal lip, the outer peripheral oil seal, and the inner peripheral dust seal lip, the inner peripheral oil seal lip slides on the inner tube in a liquid-tight manner. The oil seal mechanism in which the side oil seal part is fitted in the first large-diameter hole of the outer tube in a liquid-tight manner and the dust seal mechanism in which the inner peripheral side dust seal part slides on the inner tube are not separated from each other.
The number of parts and assembly man-hours can be reduced, and product costs can be reduced.
【0013】請求項2の発明によれば下記の作用があ
る。 密封装置は、外周側ダストシール部も併せ備え、この
外周側ダストシール部がアウタチューブの第2の大径孔
に摺接するダストシール機構も一体に具備できる。According to the second aspect of the present invention, the following operations are provided. The sealing device also has an outer peripheral side dust seal portion, and the outer peripheral side dust seal portion can be integrally provided with a dust seal mechanism that slides on the second large-diameter hole of the outer tube.
【0014】請求項3の発明によれば下記、の作用
がある。 内周側オイルシールリップ部と外周側オイルシール部
と内周側ダストシールリップ部を備えた密封装置を、ア
ウタチューブの開口端に装着するに際し、本体部の係合
部を大径孔にあて、縮径させた状態で、該係合部を大径
孔に滑らせて凹溝に係合させた後、係合部を弾性的に復
元させて拡径せしめることにより、この密封装置をスト
ッパリング等の固定部材を用いることなく開口端から抜
け止め可能として、強固に固定できる。According to the third aspect of the present invention, the following operations are provided. When mounting a sealing device having an inner peripheral side oil seal lip portion, an outer peripheral side oil seal portion, and an inner peripheral side dust seal lip portion on the open end of the outer tube, the engaging portion of the main body portion is applied to the large-diameter hole, In a state where the diameter is reduced, the engaging portion is slid into the large-diameter hole to engage with the concave groove, and then the engaging portion is elastically restored to expand the diameter. It can be firmly fixed by making it possible to prevent it from falling off from the opening end without using a fixing member such as.
【0015】密封装置は、内周側オイルシールリップ
部と外周側オイルシール部と内周側ダストシールリップ
部を併せ備えるから、内周側オイルシールリップ部がイ
ンナチューブに液密に摺接し、外周側オイルシール部が
アウタチューブの大径孔に液密に嵌合するオイルシール
機構と、内周側ダストシール部がインナチューブに摺接
するダストシール機構とが別体になることなく、部品点
数と組付工数を削減し、製品コストを低減できる。Since the sealing device includes the inner peripheral side oil seal lip, the outer peripheral side oil seal and the inner peripheral side dust seal lip, the inner peripheral side oil seal lip slidingly contacts the inner tube in a liquid-tight manner, The number of parts and assembly are such that the oil seal mechanism where the side oil seal part fits into the large diameter hole of the outer tube in a liquid-tight manner and the dust seal mechanism where the inner peripheral side dust seal part slides on the inner tube do not become separate bodies. It can reduce man-hours and product cost.
【0016】請求項4の発明によれば下記の作用があ
る。 密封装置は、外周側ダストシール部も併せ備え、この
外周側ダストシール部がアウタチューブの大径孔に摺接
するダストシール機構も一体に具備できる。According to the fourth aspect of the invention, the following effects are obtained. The sealing device also has an outer peripheral side dust seal portion, and the outer peripheral side dust seal portion can be integrally provided with a dust seal mechanism in which the outer peripheral side dust seal portion slides on a large-diameter hole of the outer tube.
【0017】請求項5の発明によれば下記の作用があ
る。 密封装置は、本体部の軸方向内側端の折曲げ成形によ
り、簡易に支持部を形成できる。According to the fifth aspect of the invention, the following operations are provided. In the sealing device, the support portion can be easily formed by bending the inner end in the axial direction of the main body.
【0018】請求項6の発明によれば下記の作用があ
る。 密封装置は、本体部の軸方向内側中間部の折曲げ成形
により、簡易に支持部を形成できる。According to the sixth aspect of the invention, the following operations are provided. In the sealing device, the support portion can be easily formed by bending the intermediate portion in the axial direction of the main body.
【0019】[0019]
【発明の実施の形態】図1はフロントフォークを示す全
体断面図、図2はフロントフォークの下部拡大断面図、
図3はフロントフォークの上部拡大断面図、図4はアウ
タチューブの開口端に設けた密封装置を拡大して示す断
面図、図5は中空パイプの取付部を拡大して示す断面
図、図6は中空パイプのピストン部の製造手順を示す模
式図、図7はインナチューブのピストン部のチェック弁
の動作を示す模式図、図8は本発明の第1変形例を示す
断面図、図9は本発明の第2変形例を示す断面図であ
る。FIG. 1 is an overall sectional view showing a front fork, FIG. 2 is an enlarged sectional view of a lower portion of the front fork,
3 is an enlarged cross-sectional view of the upper portion of the front fork, FIG. 4 is a cross-sectional view showing an enlarged sealing device provided at the open end of the outer tube, FIG. 5 is a cross-sectional view showing an enlarged portion of the hollow pipe, and FIG. Is a schematic view showing a manufacturing procedure of a piston portion of a hollow pipe, FIG. 7 is a schematic view showing an operation of a check valve of a piston portion of an inner tube, FIG. 8 is a cross-sectional view showing a first modification of the present invention, and FIG. It is sectional drawing which shows the 2nd modification of this invention.
【0020】フロントフォーク10(車両用緩衝器)
は、図1〜図3に示す如く、車輪側の、一端が閉じ、他
端が開口するアウタチューブ11に車体側のインナチュ
ーブ12を挿入し、両チューブ11、12を伸縮自在に
摺動可能としている。アウタチューブ11のインナチュ
ーブ12が挿入される開口端には密封装置13が装着さ
れている。アウタチューブ11とインナチューブ12の
摺動構造と、密封装置13の構成については、それぞれ
後に詳述する。Front fork 10 (vehicle shock absorber)
As shown in FIGS. 1 to 3, a vehicle body-side inner tube 12 is inserted into an outer tube 11 having one end closed and the other end opened on the wheel side, and both tubes 11, 12 can be slidably extended and contracted. And A sealing device 13 is attached to an open end of the outer tube 11 into which the inner tube 12 is inserted. The sliding structure of the outer tube 11 and the inner tube 12 and the configuration of the sealing device 13 will be described later in detail.
【0021】アウタチューブ11の底部には、ボルト2
1が挿入され、中空パイプ22がこのボルト21により
固定されてアウタチューブ11の内部に立設されてい
る。ボルト21による中空パイプ22の固定構造につい
ては後に詳述する。中空パイプ22の後述するピストン
部32(又は中空パイプ22の上端面)と、インナチュ
ーブ12の上端部に設けられているばねシート23との
間には、懸架スプリング24が介装されている。ばねシ
ート23は、インナチューブ12の上端側内径部にOリ
ング25を介して封着され、ストッパリング26で保持
されている。At the bottom of the outer tube 11, a bolt 2
1 is inserted, and the hollow pipe 22 is fixed by the bolts 21 and is erected inside the outer tube 11. The structure for fixing the hollow pipe 22 with the bolts 21 will be described later in detail. A suspension spring 24 is interposed between a later-described piston portion 32 of the hollow pipe 22 (or an upper end surface of the hollow pipe 22) and a spring seat 23 provided at an upper end portion of the inner tube 12. The spring seat 23 is sealed via an O-ring 25 to the inner diameter portion on the upper end side of the inner tube 12, and is held by a stopper ring 26.
【0022】インナチューブ12の下端内径部には、中
空パイプ22の外周に臨むピストン部31が加締め保持
され、また中空パイプ22の先端部には、インナチュー
ブ12の内周に臨むピストン部32が設けられている。A piston 31 facing the outer periphery of the hollow pipe 22 is held by caulking at the inner diameter of the lower end of the inner tube 12, and a piston 32 facing the inner periphery of the inner tube 12 is provided at the tip of the hollow pipe 22. Is provided.
【0023】そして、フロントフォーク10にあって
は、インナチューブ12と中空パイプ22とピストン部
31とピストン部32により、インナチューブ12が上
昇する伸長行程時に減衰力を発生させる上油室33を構
成している。また、フロントフォーク10は、ピストン
部31の下部のアウタチューブ11と中空パイプ22と
の間に下油室34を構成し、中空パイプ22の内径部と
これに連通するインナチューブ12の内部をリザーバ室
35とし、下油室34とリザーバ室35とを連通する複
数の通孔36を中空パイプ22に設けている。リザーバ
室35には作動油が充填されており、図1は、空車1G
状態での油面Lを示している。インナチューブ12の内
部で、リザーバ室35の上部空間は気体室37である。In the front fork 10, the upper oil chamber 33 for generating a damping force during the extension stroke in which the inner tube 12 rises is constituted by the inner tube 12, the hollow pipe 22, the piston 31 and the piston 32. are doing. Further, the front fork 10 forms a lower oil chamber 34 between the outer tube 11 below the piston portion 31 and the hollow pipe 22, and forms a reservoir between the inner diameter of the hollow pipe 22 and the inner tube 12 communicating therewith. A plurality of through holes 36 communicating the lower oil chamber 34 and the reservoir chamber 35 are provided in the hollow pipe 22 as a chamber 35. The reservoir chamber 35 is filled with hydraulic oil, and FIG.
The oil level L in the state is shown. Inside the inner tube 12, the upper space of the reservoir chamber 35 is a gas chamber 37.
【0024】このとき、インナチューブ12の他端内径
部のピストン部31は、バルブハウジング41とワッシ
ャ42をインナチューブ12に加締め保持され、バルブ
ハウジング41の内部で中空パイプ22に摺接して上下
動できるチェック弁43を内蔵し、(a)圧縮行程時には
チェック弁43を上動(上油室33が下油室34より低
圧になること、及び中空パイプ22のインナチューブ1
2に対する相対的な上向き移動につれて上動する)させ
て下油室34から上油室33への油の通過をチェック弁
43の上端溝43Aにより許容する(図7(A))とと
もに、(b)伸長行程時にはチェック弁43を下動(上油
室33が高圧になること、及び中空パイプ22のインナ
チューブ12に対する相対的な下向き移動につれて下動
する)させてチェック弁43の下端面をワッシャ42に
当てて上油室33から下油室34への油の通過を阻止す
る(図7(B))。また、中空パイプ22のピストン部
32は、油の通過を常時阻止する。そして、フロントフ
ォーク10は、上油室33とリザーバ室35を連通する
オリフィス38を中空パイプ22に設け、伸長行程時
に、このオリフィス38を用いて、上油室33からリザ
ーバ室35に移動する油の通路抵抗に基づき、伸長行程
時の減衰力を発生する。この伸長行程時の減衰力発生手
段はピストン部32に設けても良い。At this time, the piston portion 31 at the inner diameter of the other end of the inner tube 12 holds the valve housing 41 and the washer 42 by caulking the inner tube 12, and slides up and down inside the valve housing 41 against the hollow pipe 22. (A) The check valve 43 is moved upward during the compression stroke (the upper oil chamber 33 has a lower pressure than the lower oil chamber 34, and the inner tube 1 of the hollow pipe 22 has
(Upward movement relative to the upward movement relative to the second oil chamber 2) to allow the passage of oil from the lower oil chamber 34 to the upper oil chamber 33 by the upper end groove 43A of the check valve 43 (FIG. 7 (A)). In the extension stroke, the check valve 43 is moved downward (as the upper oil chamber 33 becomes high pressure and as the hollow pipe 22 moves downward relative to the inner tube 12), and the lower end face of the check valve 43 is washed. 42 to prevent the passage of oil from the upper oil chamber 33 to the lower oil chamber 34 (FIG. 7B). Further, the piston portion 32 of the hollow pipe 22 always blocks the passage of oil. The front fork 10 is provided with an orifice 38 communicating the upper oil chamber 33 and the reservoir chamber 35 in the hollow pipe 22, and the oil that moves from the upper oil chamber 33 to the reservoir chamber 35 using the orifice 38 during the extension stroke. , A damping force during the extension stroke is generated based on the passage resistance. The damping force generating means during the extension stroke may be provided in the piston portion 32.
【0025】尚、フロントフォーク10では、インナチ
ューブ12に設けたピストン部31と、中空パイプ22
に設けたピストン部32の間に、最大伸長時のリバウン
ドスプリング39を設けている。In the front fork 10, a piston 31 provided on the inner tube 12 and a hollow pipe 22 are provided.
, A rebound spring 39 at the time of maximum extension is provided.
【0026】また、フロントフォーク10では、中空パ
イプ22のピストン部32を図6に示す如くに構成して
いる。中空パイプ22は、直管パイプ51の上端部を薄
肉部52としておき、この薄肉部52に上下2枚の各皿
状ピストン片53、54を背中合せで嵌挿し(図6
(A)、(B))、薄肉部52の先端部を加締め加工し
てそれらのピストン片53、54を保持する(図6
(C))。そして、両ピストン片53、54の外周の間
に形成されるリング溝55Aに樹脂製ピストンリング5
5を装填する(図6(D))。ピストンリング55は、
周方向の一部に切り口を持つ弾性リングからなり、切り
口を閉じた状態でアウタチューブ12の内周に密着する
真円をなすものであり、リング溝55Aに装填された
後、押し縮められた状態でインナチューブ12の内径に
嵌め込まれて用いられる。In the front fork 10, the piston 32 of the hollow pipe 22 is configured as shown in FIG. The hollow pipe 22 has an upper end portion of a straight pipe 51 as a thin portion 52, and two upper and lower disc-shaped piston pieces 53, 54 are fitted into the thin portion 52 back to back (FIG. 6).
(A), (B)), the tip of the thin portion 52 is crimped to hold the piston pieces 53, 54 (FIG. 6).
(C)). The resin piston ring 5 is inserted into a ring groove 55A formed between the outer circumferences of the piston pieces 53 and 54.
5 is loaded (FIG. 6D). The piston ring 55
It is made of an elastic ring having a cut in a part in the circumferential direction, and forms a perfect circle which is in close contact with the inner periphery of the outer tube 12 in a state where the cut is closed, and is compressed after being loaded into the ring groove 55A. In this state, it is used by being fitted into the inner diameter of the inner tube 12.
【0027】フロントフォーク10にあっては、車輪が
受ける衝撃を懸架スプリング24と、気体室37の空気
ばねによって吸収して緩和し、この衝撃の吸収に伴う懸
架スプリング24の振動を上油室33、下油室34で生
ずる減衰力によって抑制する。In the front fork 10, the suspension spring 24 and the air spring of the gas chamber 37 absorb and reduce the impact received by the wheels, and the vibration of the suspension spring 24 caused by the absorption of the impact is absorbed by the upper oil chamber 33. , By the damping force generated in the lower oil chamber 34.
【0028】即ち、フロントフォーク10は以下の如く
に減衰作用を行なう。 (圧縮行程)フロントフォーク10の圧縮行程時には、
インナチューブ12が下降して下油室34の圧力が上昇
し、インナチューブ12の断面積×ストローク分の油が
下油室34から通孔36を通ってリザーバ室35へ移動
し、この通孔36の通路抵抗による圧側減衰力を得るこ
とで、懸架スプリング24のひずみ速度を制御する。That is, the front fork 10 performs a damping action as follows. (Compression stroke) During the compression stroke of the front fork 10,
The inner tube 12 is lowered and the pressure in the lower oil chamber 34 is increased, and oil corresponding to the cross-sectional area of the inner tube 12 × the stroke moves from the lower oil chamber 34 to the reservoir chamber 35 through the through hole 36, and this through hole The strain rate of the suspension spring 24 is controlled by obtaining the compression-side damping force due to the passage resistance 36.
【0029】また、この圧縮時には、ピストン部31の
チェック弁43の前述(a)の開動作により下油室34の
油が上油室33に入り、且つ中空パイプ22のオリフィ
ス38を通ってリザーバ室35の油が上油室33に入
る。これにより、インナチューブ12が路面の凹凸によ
って高速度で下降する圧縮時にも、上油室33には下油
室34、リザーバ室35から充分な油が供給されて負圧
化することがなく、この圧縮行程に続く、伸び行程で減
衰力を発生しなくなることを防止する。At the time of this compression, the oil in the lower oil chamber 34 enters the upper oil chamber 33 by the opening operation of the check valve 43 of the piston part 31 as described above (a), and passes through the orifice 38 of the hollow pipe 22 to the reservoir. The oil in the chamber 35 enters the upper oil chamber 33. As a result, even during compression in which the inner tube 12 descends at a high speed due to unevenness of the road surface, sufficient oil is supplied to the upper oil chamber 33 from the lower oil chamber 34 and the reservoir chamber 35 to prevent a negative pressure from being generated. It is possible to prevent the damping force from no longer being generated in the extension stroke following the compression stroke.
【0030】(伸縮行程)フロントフォーク10の伸縮
行程時には、インナチューブ12が上昇して上油室33
の圧力が上昇し、上油室33の油がオリフィス38を通
ってリザーバ室35へ移動し、このオリフィス38の通
路抵抗による大きな伸び側減衰力を得ることで、懸架ス
プリング24の共振を防止する。(Telescopic stroke) During the telescopic stroke of the front fork 10, the inner tube 12 rises and the upper oil chamber 33 is raised.
, The oil in the upper oil chamber 33 moves to the reservoir chamber 35 through the orifice 38, and obtains a large extension side damping force due to the passage resistance of the orifice 38, thereby preventing resonance of the suspension spring 24. .
【0031】また、この伸長時には、インナチューブ1
2の断面積×ストローク分の油がリザーバ室35から通
孔36を通って下油室34へ移動し、ロッド体積分の作
動油が下油室34に補償される。At the time of extension, the inner tube 1
The oil corresponding to the cross-sectional area of 2 × the stroke moves from the reservoir chamber 35 to the lower oil chamber 34 through the through hole 36, and the hydraulic oil corresponding to the rod volume is compensated for in the lower oil chamber 34.
【0032】尚、この伸長時に、ピストン部31のチェ
ック弁43は前述(b)の閉動作により上油室33と下油
室34の連通を遮断し、上述の伸び側減衰力の発生に影
響を及ぼさない。At the time of the extension, the check valve 43 of the piston portion 31 cuts off the communication between the upper oil chamber 33 and the lower oil chamber 34 by the closing operation (b) described above, thereby affecting the generation of the extension side damping force. Has no effect.
【0033】然るに、フロントフォーク10にあって
は、下記(A)〜(C)の構成を具備する。 (A)アウタチューブ11とインナチューブ12の摺動構
造(図1〜図3) アウタチューブ11の開口端寄りの内周面をインナチュ
ーブ12が摺接する第1ガイド部61(長さL1)と
し、閉塞端寄りの内周面をインナチューブ12が摺接す
る第2ガイド部62(長さL2)とし、第1ガイド部6
1と第2ガイド部62の間の内周面をインナチューブ1
2が摺接しない大内径の肉抜き部63とする。However, the front fork 10 has the following configurations (A) to (C). (A) Sliding Structure of Outer Tube 11 and Inner Tube 12 (FIGS. 1 to 3) The inner peripheral surface near the opening end of the outer tube 11 is a first guide portion 61 (length L1) with which the inner tube 12 slides. The inner peripheral surface near the closed end is a second guide portion 62 (length L2) with which the inner tube 12 slides, and the first guide portion 6
The inner peripheral surface between the first and second guide portions 62 is
2 is a large-diameter lightening portion 63 that does not slide.
【0034】このとき、第2ガイド部62はアウタチュ
ーブ11の中間部から閉塞端部まで連続して形成され
る。At this time, the second guide portion 62 is formed continuously from the middle portion of the outer tube 11 to the closed end.
【0035】アウタチューブ11はアルミ等の軽合金を
鋳造して製作でき、肉抜き部63は鋳抜き(中子に予め
減肉相当部を付与し、この中子を用いて鋳抜き成形す
る)により形成し、第1ガイド部61、第2ガイド部6
2はBTA工具等を用いて形成できる。The outer tube 11 can be manufactured by casting a light alloy such as aluminum. The hollow portion 63 is cast (a portion corresponding to a reduced thickness is previously provided to the core, and the core is cast and formed using the core). And the first guide portion 61 and the second guide portion 6
2 can be formed using a BTA tool or the like.
【0036】インナチューブ12は冷間引抜き鋼管又は
冷間押出し鋼管を用いて、それらの引抜き鋼管又は押出
し鋼管の表面を研磨後、クロームメッキ等を施したもの
をアウタチューブ11の第1ガイド部61、第2ガイド
部62との摺接面とすることができる。The inner tube 12 is a cold drawn steel tube or a cold extruded steel tube, and the surface of the drawn steel tube or the extruded steel tube is polished and then chrome-plated or the like is applied to the inner tube 12 to form a first guide portion 61 of the outer tube 11. , And a sliding contact surface with the second guide portion 62.
【0037】従って、フロントフォーク10によれば、
以下の作用がある。 インナチューブ12は、アウタチューブ11の第1ガ
イド部61と第2ガイド部62により長手方向の長いス
パンを支持され、安定的に摺動できる。Therefore, according to the front fork 10,
The following operations are provided. The inner tube 12 is supported by the first guide portion 61 and the second guide portion 62 of the outer tube 11 for a long span in the longitudinal direction, and can slide stably.
【0038】アウタチューブ11は第1ガイド部61
と第2ガイド部62の間を肉抜き部63とされたから、
アウタチューブ11の軽量化、ひいてはフロントフォー
ク10の軽量化を実現し、車両の走行性能を向上でき
る。The outer tube 11 has a first guide portion 61.
Since the lightening portion 63 is formed between the second guide portion 62 and the
The weight of the outer tube 11 and the weight of the front fork 10 can be reduced, and the running performance of the vehicle can be improved.
【0039】アウタチューブ11とインナチューブ1
2の摺動のために、ブッシュを用いる必要がなくなって
部品点数を削減でき、これに伴う組付工数及び加工工数
を削減できる。Outer tube 11 and inner tube 1
The use of the bush eliminates the necessity of using a bush, thereby reducing the number of parts and the associated man-hours and processing man-hours.
【0040】(B)密封装置13の構成(図4) アウタチューブ11は、図4に示す如く、インナチュー
ブ12が挿入される開口端に、第1の大径孔71と、第
1の大径孔71より軸方向外側に設けられた、第1の大
径孔71より大内径の第2の大径孔72と、第2の大径
孔72の内周に設けられた凹溝73を備える。(B) Structure of Sealing Device 13 (FIG. 4) As shown in FIG. 4, the outer tube 11 has a first large-diameter hole 71 and a first large hole at the open end where the inner tube 12 is inserted. A second large-diameter hole 72 having an inner diameter larger than that of the first large-diameter hole 71 and a concave groove 73 provided on the inner periphery of the second large-diameter hole 72 are provided on the outer side in the axial direction from the diameter hole 71. Prepare.
【0041】密封装置13は、図4に示す如く、ばね材
等の金属製の補強環81に、ゴム状弾性体等からなる内
周側オイルシールリップ部82、外周側オイルシール部
83、内周側ダストシールリップ部84、内周側サブダ
ストシールリップ部85、外周側ダストシール部86を
接合一体化されて備える。As shown in FIG. 4, the sealing device 13 includes a metal reinforcing ring 81 such as a spring material and an inner oil seal lip 82 and an outer oil seal 83 made of a rubber-like elastic material. A peripheral dust seal lip 84, an inner peripheral sub dust seal lip 85, and an outer peripheral dust seal 86 are joined and integrated.
【0042】このとき、密封装置13の補強環81は、
環状の本体部81Aと、本体部81Aの軸方向外側部か
ら径方向外方に該本体部81Aとの間に隙間を介して折
曲げ形成され、径方向に弾性的に拡縮して第2の大径孔
72に嵌合し得る環状の弾性部81Bと、弾性部81B
から径方向外方に折曲げ形成され、凹溝73に係合し得
る係合部81Cと、本体部81Aの軸方向内側部を該本
体部81Aの内周側に折曲げ形成した環状の支持部81
Dとを備える。支持部81Dは、本体部81Aの軸方向
内側端を、該本体部81Aの内周に接するように折曲
げ、その折曲げの先端部を径方向内方に折曲げて形成さ
れる。At this time, the reinforcing ring 81 of the sealing device 13
An annular main body portion 81A is bent from the axially outer portion of the main body portion 81A outward in the radial direction with a gap between the main body portion 81A and elastically expanded and contracted in the radial direction to form the second main body portion 81A. An annular elastic portion 81B that can be fitted into the large-diameter hole 72;
An engaging portion 81C that is formed to be bent outward in the radial direction and that can be engaged with the concave groove 73, and an annular support that is formed by bending an inner side portion of the main body portion 81A in the axial direction toward an inner peripheral side of the main body portion 81A. Part 81
D. The support portion 81D is formed by bending the axially inner end of the main body portion 81A so as to be in contact with the inner periphery of the main body portion 81A, and bending the distal end of the bent radially inward.
【0043】そして、内周側オイルシールリップ部82
は、補強環81の支持部81Dに設けられ、スプリング
87により縮径習性を付与されてインナチューブ12の
外周に液密に摺接する。外周側オイルシール部83は、
補強環81の本体部81Aの軸方向内側の外周部に設け
られ、第1の大径孔71に液密に嵌合する。The inner peripheral oil seal lip 82
Is provided on the support portion 81 </ b> D of the reinforcing ring 81, is provided with a diameter reducing behavior by a spring 87, and comes into sliding contact with the outer periphery of the inner tube 12 in a liquid-tight manner. The outer peripheral oil seal portion 83 is
The reinforcing ring 81 is provided on the outer peripheral portion on the inner side in the axial direction of the main body portion 81A, and is fitted in the first large-diameter hole 71 in a liquid-tight manner.
【0044】また、内周側ダストシールリップ部84
は、補強環81の本体部81Aの軸方向外側の内周部に
設けられ、インナチューブ12の外周に摺接する。内周
側サブダストシールリップ部85は、補強環81の支持
部81Dにおいて、内周側オイルシールリップ部82の
外側(且つ内周側ダストシールリップ部84の内側)に
設けられ、インナチューブ12の外周に摺接する。外周
側ダストシール部86は、補強環81の弾性部81Bの
外周部に設けられ、第2の大径孔72に嵌合する。The inner peripheral side dust seal lip 84
Is provided on the inner peripheral portion of the main body portion 81 </ b> A of the reinforcing ring 81 in the axial direction, and is in sliding contact with the outer periphery of the inner tube 12. The inner peripheral side sub dust seal lip portion 85 is provided outside the inner peripheral side oil seal lip portion 82 (and inside the inner peripheral side dust seal lip portion 84) in the support portion 81 </ b> D of the reinforcing ring 81. In sliding contact with The outer peripheral side dust seal portion 86 is provided on the outer peripheral portion of the elastic portion 81 </ b> B of the reinforcing ring 81, and fits in the second large-diameter hole 72.
【0045】尚、内周側オイルシールリップ部82と内
周側サブダストシールリップ部85は一体化され、内周
側ダストシールリップ部84と外周側ダストシール部8
6は一体化されて良い。The inner peripheral oil seal lip 82 and the inner peripheral sub dust seal lip 85 are integrated, and the inner peripheral dust seal lip 84 and the outer peripheral dust seal 8 are integrated.
6 may be integrated.
【0046】従って、フロントフォーク10によれば、
以下の作用がある。 内周側オイルシールリップ部82と外周側オイルシー
ル部83と内周側ダストシールリップ部84と内周側サ
ブダストシールリップ部85と外周側ダストシール部8
6を備えた密封装置13を、アウタチューブ11の開口
端に装着するに際し、弾性部81Bの係合部81Cをア
ウタチューブ11の第2の大径孔72にあて、弾性部8
1Bを縮径させた状態で、該係合部81Cを第2の大径
孔72に滑らせて凹溝73に係合させた後、弾性部81
Bを弾性的に復元させて拡径せしめることにより、この
密封装置13をストッパリング等の固定部材を用いるこ
となく開口端から抜け止め可能として、強固に固定でき
る。Therefore, according to the front fork 10,
The following operations are provided. Inner peripheral oil seal lip 82, outer peripheral oil seal 83, inner peripheral dust seal lip 84, inner peripheral sub dust seal lip 85, and outer peripheral dust seal 8
When the sealing device 13 provided with the outer tube 6 is attached to the open end of the outer tube 11, the engaging portion 81C of the elastic portion 81B is placed in the second large-diameter hole 72 of the outer tube 11, and the elastic portion 8
After the engagement portion 81C is slid into the second large-diameter hole 72 and engaged with the concave groove 73 in a state where the diameter of the elastic portion 1B is reduced, the elastic portion 81
By resiliently restoring B and expanding the diameter, the sealing device 13 can be prevented from coming off from the opening end without using a fixing member such as a stopper ring, and can be firmly fixed.
【0047】密封装置13は、内周側オイルシールリ
ップ部82と外周側オイルシール部83と内周側ダスト
シールリップ部84と内周側サブダストシールリップ部
85と外周側ダストシール部86を併せ備えるから、内
周側オイルシールリップ部82がインナチューブ12に
液密に摺接し、外周側オイルシール部83がアウタチュ
ーブ11の第1の大径孔71に液密に嵌合するオイルシ
ール機構と、内周側ダストシールリップ部84及び内周
側サブダストシールリップ部85がインナチューブ12
に摺接し、外周側ダストシール部86がアウタチューブ
11の第2の大径孔72に摺接するダストシール機構と
が別体になることがなく、部品点数と組付工数を削減
し、製品コストを低減できる。The sealing device 13 includes the inner peripheral oil seal lip 82, the outer peripheral oil seal 83, the inner peripheral dust seal lip 84, the inner peripheral sub dust seal lip 85, and the outer peripheral dust seal 86. An oil seal mechanism in which the inner peripheral side oil seal lip portion 82 is in sliding contact with the inner tube 12 in a liquid-tight manner, and the outer peripheral side oil seal portion 83 is fitted in the first large-diameter hole 71 of the outer tube 11 in a liquid-tight manner; The inner peripheral side dust seal lip 84 and the inner peripheral side sub dust seal lip 85
, And the dust seal mechanism in which the outer peripheral side dust seal portion 86 slides in contact with the second large-diameter hole 72 of the outer tube 11 does not become a separate body, thereby reducing the number of parts and the number of assembling steps, and reducing the product cost. it can.
【0048】密封装置13は、補強環81の本体部8
1Aの軸方向内側端の折曲げ成形により、簡易に支持部
81Dを形成できる。The sealing device 13 includes a main body 8 of the reinforcing ring 81.
The supporting portion 81D can be easily formed by bending the inner end in the axial direction of 1A.
【0049】(C)ボルト21による中空パイプ22の固
定構造(図5) アウタチューブ11の底部に取付孔91を設け、中空パ
イプ22の基端部に小径部92を設け、中空パイプ22
の小径部92をアウタチューブ11の取付孔91に嵌挿
し、アウタチューブ11の底部に外方から係着されるボ
ルト21の先端ねじ部まわりに樹脂等からなるシール剤
を塗布した上で、該ボルト21の先端ねじ部を中空パイ
プ22の小径部92の内径のねじ部92Aに螺着する。
これにより、中空パイプ22の基端部の側の外周面93
をアウタチューブ11の底部の側の内周面94に衝合し
て該中空パイプ22を引寄せ固定する。(C) Fixing Structure of Hollow Pipe 22 with Bolt 21 (FIG. 5) A mounting hole 91 is provided at the bottom of the outer tube 11, and a small-diameter portion 92 is provided at the base end of the hollow pipe 22.
The small-diameter portion 92 is inserted into the mounting hole 91 of the outer tube 11, and a sealing agent made of resin or the like is applied around a threaded end of the bolt 21 which is engaged with the bottom of the outer tube 11 from outside. The threaded end of the bolt 21 is screwed into the threaded portion 92 </ b> A having the inner diameter of the small diameter portion 92 of the hollow pipe 22.
As a result, the outer peripheral surface 93 on the base end side of the hollow pipe 22 is formed.
Against the inner peripheral surface 94 on the bottom side of the outer tube 11 to draw and fix the hollow pipe 22.
【0050】このとき、アウタチューブ11は前述の如
くアルミ(例えば表1のAC2B−F)の軽合金にて構
成し、中空パイプ22は鋼管等(例えば表1のSTKM
11A)にて構成することにより、アウタチューブ11
の硬度を例えば表1の如くに中空パイプ22より軟質と
なる材料にて構成し、更に、中空パイプ22の外周面9
3とアウタチューブ11の内周面94とを互いにくさび
結合(テーパ結合)するテーパ面とする。At this time, the outer tube 11 is made of a light alloy of aluminum (for example, AC2BF of Table 1) as described above, and the hollow pipe 22 is made of a steel pipe or the like (for example, STKM of Table 1).
11A), the outer tube 11
Is made of a material which is softer than the hollow pipe 22 as shown in Table 1, for example.
3 and the inner peripheral surface 94 of the outer tube 11 are tapered surfaces that are wedge-coupled (taper-coupled) to each other.
【0051】[0051]
【表1】 [Table 1]
【0052】従って、フロントフォーク10によれば以
下の作用がある。 アウタチューブ11における中空パイプ22の取付部
では、ボルト21の締結力により、中空パイプ22のテ
ーパ状外周面93がアウタチューブ11のテーパ状外周
面94にテーパ嵌合して強固にくさび結合する。Accordingly, the front fork 10 has the following operation. At the mounting portion of the hollow pipe 22 in the outer tube 11, the tapered outer peripheral surface 93 of the hollow pipe 22 is taperedly fitted to the tapered outer peripheral surface 94 of the outer tube 11 by the fastening force of the bolt 21 and is strongly wedge-coupled.
【0053】アウタチューブ11のテーパ状内周面9
4は中空パイプ22のテーパ状外周面93より軟質であ
り、両者は上述の強固なくさび結合下で良くなじんで
密着し、パッキン類を用いることを必須としない簡易な
構成でも、一定のシール作用を確保し、アウタチューブ
11の内部の油室34を確実にシールできる。尚、中空
パイプ22の内部のリザーバ室35はボルト21の先端
ねじ部まわりのシール材によりシールされる。The tapered inner peripheral surface 9 of the outer tube 11
Numeral 4 is softer than the tapered outer peripheral surface 93 of the hollow pipe 22, and both are well fitted and adhered to each other under the above-mentioned strong wedge connection. Even with a simple structure that does not require the use of packings, a certain sealing action is obtained. And the oil chamber 34 inside the outer tube 11 can be reliably sealed. The reservoir chamber 35 inside the hollow pipe 22 is sealed by a sealing material around the threaded end of the bolt 21.
【0054】尚、フロントフォーク10にあっては、ア
ウタチューブ11おける中空パイプ22の上述の取付部
において、ボルト21の首下部に銅パッキン等を嵌挿
し、ボルト21の頭部とアウタチューブ11の取付孔9
1の周囲の外側端面との間でその銅パッキン等を挟むこ
とにより、アウタチューブ11の内部の油室34をより
確実にシールできる。In the front fork 10, a copper packing or the like is inserted under the neck of the bolt 21 in the above-mentioned mounting portion of the hollow pipe 22 in the outer tube 11, and the head of the bolt 21 and the outer tube 11 are connected to each other. Mounting hole 9
By sandwiching the copper packing or the like between the outer peripheral surface of the outer tube 1 and the outer peripheral surface of the outer tube 11, the oil chamber 34 inside the outer tube 11 can be more reliably sealed.
【0055】図8の第1変形例が図4の実施例と異なる
点は、密封装置13を構成する補強環81の支持部81
Dが、本体部81Aの軸方向内側中間部を、径方向内方
に折曲げて形成されたことにある。それによれば、密封
装置13は、本体部81Aの軸方向内側中間部の折曲げ
成形により、簡易に支持部81Dを形成できる。The first modification of FIG. 8 is different from the embodiment of FIG. 4 in that a supporting portion 81 of a reinforcing ring 81 constituting the sealing device 13 is provided.
D is formed by bending the axially inner middle portion of the main body portion 81A inward in the radial direction. According to this, the sealing device 13 can easily form the support portion 81D by bending the axially intermediate portion of the main body portion 81A.
【0056】図9の第2変形例が図4の実施例と異なる
点は、以下の通りである。即ち、アウタチューブ11
は、インナチューブ12が挿入される開口端に、大径孔
101と、大径孔101の内周に設けられた凹溝102
を備える。密封装置110は、ばね材等の金属製の補強
環111に、ゴム状弾性体等からなる内周側オイルシー
ルリップ部112、外周側オイルシール部113、内周
側ダストシールリップ部114、内周側サブダストシー
ルリップ部115、外周側ダストシール部116を接合
一体化されて備える。The difference between the second modification of FIG. 9 and the embodiment of FIG. 4 is as follows. That is, the outer tube 11
A large-diameter hole 101 and a concave groove 102 provided on the inner periphery of the large-diameter hole 101 are formed at the open end into which the inner tube 12 is inserted.
Is provided. The sealing device 110 includes a metal reinforcing ring 111 such as a spring material, and an inner peripheral oil seal lip 112, an outer peripheral oil seal 113, an inner peripheral dust seal lip 114, and an inner peripheral The side sub dust seal lip 115 and the outer peripheral side dust seal 116 are joined and integrated.
【0057】このとき、密封装置110の補強環111
は、大径孔101に嵌合し得る環状の本体部111A
と、本体部111Aから径方向外方に切欠形成され、径
方向に弾性的に拡縮して凹溝102に係合し得る係合部
111Bと、本体部111Aの軸方向内側部を該本体部
111Aの内周側に折曲げ形成した環状の支持部111
Cとを備える。支持部111Cは、本体部111Aの軸
方向内側端を、該本体部111Aの内周に接するように
折曲げ、その折曲げの先端部を径方向内方に折曲げて形
成される。At this time, the reinforcing ring 111 of the sealing device 110
Is an annular main body 111A that can be fitted into the large-diameter hole 101.
And an engaging portion 111B which is radially outwardly cut out from the main body portion 111A and elastically expands and contracts in the radial direction to be able to engage with the concave groove 102; and an axially inner portion of the main body portion 111A An annular support portion 111 bent on the inner peripheral side of 111A
C. The support portion 111C is formed by bending the axially inner end of the main body 111A so as to be in contact with the inner periphery of the main body 111A, and bending the distal end of the bend radially inward.
【0058】そして、内周側オイルシールリップ部11
2は、補強環111の支持部111Dに設けられ、スプ
リング117により縮径習性を付与されてインナチュー
ブ12の外周に液密に摺接する。外周側オイルシール部
113は、補強環111の本体部111Aの軸方向内側
の外周部に設けられ、大径孔101に液密に嵌合する。Then, the inner peripheral side oil seal lip 11
Numeral 2 is provided on the support portion 111 </ b> D of the reinforcing ring 111, and is provided with the property of reducing the diameter by the spring 117, and comes into liquid-tight sliding contact with the outer periphery of the inner tube 12. The outer peripheral side oil seal portion 113 is provided on the outer peripheral portion of the main body 111 </ b> A of the reinforcing ring 111 in the axial direction, and is fitted in the large-diameter hole 101 in a liquid-tight manner.
【0059】また、内周側ダストシールリップ部114
は、補強環111の本体部111Aの軸方向外側の内周
部に設けられ、インナチューブ12の外周に摺接する。
内周側サブダストシールリップ部115は、補強環11
1の支持部111Cにおいて、内周側オイルシールリッ
プ部112の外側(且つ内周側ダストシールリップ部1
14の内側)に設けられ、インナチューブ12の外周に
摺接する。外周側ダストシール部116は、補強環11
1の本体部111Aの外周部に設けられ、大径孔101
に嵌合する。The inner peripheral side dust seal lip 114
Is provided on the inner peripheral portion of the main body 111 </ b> A of the reinforcing ring 111 on the outside in the axial direction, and slides on the outer periphery of the inner tube 12.
The inner peripheral side sub dust seal lip 115 is
1 outside the inner peripheral oil seal lip 112 (and the inner peripheral dust seal lip 1
14 (inside of the inner tube 14), and is in sliding contact with the outer periphery of the inner tube 12. The outer peripheral side dust seal portion 116 is
1 is provided on the outer periphery of the main body 111A, and the large-diameter hole 101 is provided.
Fits.
【0060】尚、内周側オイルシールリップ部112と
内周側サブダストシールリップ部115は一体化され、
内周側ダストシールリップ部114と外周側ダストシー
ル部116は一体化されて良い。The inner peripheral oil seal lip 112 and the inner peripheral sub dust seal lip 115 are integrated,
The inner peripheral side dust seal lip portion 114 and the outer peripheral side dust seal portion 116 may be integrated.
【0061】従って、第2変形例によれば、以下の作用
がある。 内周側オイルシールリップ部112と外周側オイルシ
ール部113と内周側ダストシールリップ部114と内
周側サブダストシールリップ部115と外周側ダストシ
ール部116を備えた密封装置110を、アウタチュー
ブ11の開口端に装着するに際し、本体部111Aの係
合部111Bをアウタチューブ11の大径孔101にあ
て、縮径させた状態で、該係合部111Bを大径孔10
1に滑らせて凹溝102に係合させた後、係合部111
Bを弾性的に復元させて拡径せしめることにより、この
密封装置110をストッパリング等の固定部材を用いる
ことなく開口端から抜け止め可能として、強固に固定で
きる。Therefore, according to the second modification, the following operation is provided. The sealing device 110 including the inner peripheral side oil seal lip portion 112, the outer peripheral side oil seal portion 113, the inner peripheral side dust seal lip portion 114, the inner peripheral side sub dust seal lip portion 115, and the outer peripheral side dust seal portion 116 At the time of attachment to the open end, the engaging portion 111B of the main body 111A is placed in the large-diameter hole 101 of the outer tube 11 and the diameter of the engaging portion 111B is reduced.
1 to engage with the concave groove 102,
By resiliently restoring B and expanding the diameter, the sealing device 110 can be prevented from coming off from the opening end without using a fixing member such as a stopper ring, and can be firmly fixed.
【0062】密封装置110は、内周側オイルシール
リップ部112と外周側オイルシール部113と内周側
ダストシールリップ部114と内周側サブダストシール
リップ部115と外周側ダストシール部116を併せ備
えるから、内周側オイルシールリップ部112がインナ
チューブ12に液密に摺接し、外周側オイルシール部1
13がアウタチューブ11の大径孔101に液密に嵌合
するオイルシール機構と、内周側ダストシールリップ部
114及び内周側サブダストシールリップ部115がイ
ンナチューブ12に摺接し、外周側ダストシール部11
6がアウタチューブ11の大径孔101に摺接するダス
トシール機構とが別体になることがなく、部品点数と組
付工数を削減し、製品コストを低減できる。The sealing device 110 includes the inner peripheral oil seal lip 112, the outer peripheral oil seal 113, the inner peripheral dust seal lip 114, the inner peripheral sub dust seal lip 115, and the outer peripheral dust seal 116. The inner peripheral side oil seal lip portion 112 is in sliding contact with the inner tube 12 in a liquid-tight manner, and the outer peripheral side oil seal portion 1
An oil seal mechanism 13 is fitted in the large-diameter hole 101 of the outer tube 11 in a liquid-tight manner, and an inner-peripheral-side dust seal lip 114 and an inner-peripheral sub-dust seal lip 115 slidably contact the inner tube 12. 11
The dust seal mechanism 6 that slides on the large-diameter hole 101 of the outer tube 11 does not become a separate body, so that the number of parts and the number of assembling steps can be reduced, and the product cost can be reduced.
【0063】密封装置110は、補強環111の本体
部111Aの軸方向内側端の折曲げ成形により、簡易に
支持部111Cを形成できる。In the sealing device 110, the support portion 111C can be easily formed by bending the inner end in the axial direction of the main body portion 111A of the reinforcing ring 111.
【0064】以上、本発明の実施の形態を図面により詳
述したが、本発明の具体的な構成はこの実施の形態に限
られるものではなく、本発明の要旨を逸脱しない範囲の
設計の変更等があっても本発明に含まれる。Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to the embodiments, and the design can be changed within a range not departing from the gist of the present invention. The present invention is also included in the present invention.
【0065】[0065]
【発明の効果】以上のように本発明によれば、アウタチ
ューブの開口端にオイルシール機構とダストシール機構
を設けるに際し、部品点数と組付工数を削減し、製品コ
ストを低減することができる。As described above, according to the present invention, when providing the oil seal mechanism and the dust seal mechanism at the opening end of the outer tube, the number of parts and the number of assembling steps can be reduced, and the product cost can be reduced.
【図1】図1はフロントフォークを示す全体断面図であ
る。FIG. 1 is an overall sectional view showing a front fork.
【図2】図2はフロントフォークの下部拡大断面図であ
る。FIG. 2 is an enlarged sectional view of a lower portion of a front fork.
【図3】図3はフロントフォークの上部拡大断面図であ
る。FIG. 3 is an enlarged cross-sectional view of an upper portion of a front fork.
【図4】図4はアウタチューブの開口端に設けた密封装
置を拡大して示す断面図である。FIG. 4 is an enlarged sectional view showing a sealing device provided at an open end of an outer tube.
【図5】図5は中空パイプの取付部を拡大して示す断面
図である。FIG. 5 is an enlarged sectional view showing a mounting portion of the hollow pipe.
【図6】図6は中空パイプのピストン部の製造手順を示
す模式図である。FIG. 6 is a schematic view showing a procedure for manufacturing a piston portion of a hollow pipe.
【図7】図7はインナチューブのピストン部のチェック
弁の動作を示す模式図である。FIG. 7 is a schematic view showing an operation of a check valve of a piston portion of the inner tube.
【図8】図8は本発明の第1変形例を示す断面図であ
る。FIG. 8 is a sectional view showing a first modification of the present invention.
【図9】図9は本発明の第2変形例を示す断面図であ
る。FIG. 9 is a sectional view showing a second modification of the present invention.
10 フロントフォーク(車両用緩衝器) 11 アウタチューブ 12 インナチューブ 13、110 密封装置 71 第1の大径孔 72 第2の大径孔 73、102 凹溝 81A、111A 本体部 81B 弾性部 81C、111B 係合部 81D、111C 支持部 82、112 内周側オイルシールリップ部 83、113 外周側オイルシール部 84、114 内周側ダストシールリップ部 86、115 外周側ダストシール部 101 大径孔 DESCRIPTION OF SYMBOLS 10 Front fork (vehicle shock absorber) 11 Outer tube 12 Inner tube 13, 110 Sealing device 71 First large-diameter hole 72 Second large-diameter hole 73, 102 Concave groove 81A, 111A Main body portion 81B Elastic portion 81C, 111B Engagement part 81D, 111C Support part 82, 112 Inner peripheral side oil seal lip part 83, 113 Outer peripheral side oil seal part 84, 114 Inner peripheral side dust seal lip part 86, 115 Outer peripheral side dust seal part 101 Large diameter hole
Claims (6)
自在に挿入し、アウタチューブとインナチューブの内部
に作動油を封入して構成され、 アウタチューブのインナチューブが挿入される開口端
に、第1の大径孔と、第1の大径孔より軸方向外側に設
けられた該第1の大径孔より大内径の第2の大径孔と、
第2の大径孔の内周に設けられた凹溝を備え、 アウタチューブの上記開口端に装着される車両用緩衝器
の密封装置であって、 環状の本体部と、 本体部の軸方向外側部から径方向外方に該本体部との間
に隙間を介して折曲げ形成された、径方向に弾性的に拡
縮して第2の大径孔に嵌合し得る環状の弾性部と、 弾性部から径方向外方に折曲げ形成され、凹溝に係合し
得る係合部と、 本体部の軸方向内側部を該本体部の内周側に折曲げ形成
した環状の支持部と、 支持部に設けた、インナチューブの外周に摺接する内周
側オイルシールリップ部と、 本体部の軸方向内側の外周部に設けた、第1の大径孔に
嵌合する外周側オイルシール部と、 本体部の軸方向外側の内周部に設けた、インナチューブ
の外周に摺接する内周側ダストシールリップ部とを有し
てなる車両用緩衝器の密封装置。An inner tube is slidably inserted into an outer tube, and hydraulic oil is sealed inside the outer tube and the inner tube. A first end of the outer tube is inserted into an opening end of the inner tube into which the inner tube is inserted. A large-diameter hole, and a second large-diameter hole having an inner diameter larger than the first large-diameter hole provided outside of the first large-diameter hole in the axial direction;
A sealing device for a shock absorber for a vehicle, comprising a concave groove provided on an inner periphery of a second large-diameter hole, the sealing device being mounted on the open end of an outer tube, wherein an annular main body portion and an axial direction of the main body portion are provided. An annular elastic portion that is bent outward from the outer portion in the radial direction with a gap between the main body portion and the elastic portion and is elastically expandable and contractible in the radial direction and can be fitted into the second large-diameter hole; An engaging portion formed radially outward from the elastic portion and capable of engaging with the concave groove; and an annular support portion formed by bending an axially inner portion of the main body portion on the inner peripheral side of the main body portion. An inner oil seal lip portion provided on the support portion and slidably contacting the outer circumference of the inner tube; and an outer oil portion fitted on the first large-diameter hole provided on the outer peripheral portion on the inner side in the axial direction of the main body portion. A seal portion, and an inner peripheral side dust seal lip portion provided on an axially outer inner peripheral portion of the main body portion and slidably contacting the outer periphery of the inner tube. Sealing device for a vehicle shock absorber comprising a.
径孔に嵌合する外周側ダストシール部を有してなる請求
項1記載の車両用緩衝器の密封装置。2. The sealing device for a shock absorber for a vehicle according to claim 1, further comprising an outer peripheral side dust seal portion provided on an outer peripheral portion of the elastic portion and fitted to the second large-diameter hole.
自在に挿入し、アウタチューブとインナチューブの内部
に作動油を封入して構成され、 アウタチューブのインナチューブが挿入される開口端
に、大径孔と、大径孔の内周に設けられた凹溝を備え、 アウタチューブの上記開口端に装着される車両用緩衝器
の密封装置であって、 大径孔に嵌合し得る環状の本体部と、 本体部から径方向外方に切欠形成され、径方向に弾性的
に拡縮して凹溝に係合し得る係合部と、 本体部の軸方向内側部を該本体部の内周側に折曲げ形成
した環状の支持部と、 支持部に設けた、インナチューブの外周に摺接する内周
側オイルシールリップ部と、 本体部の軸方向内側の外周部に設けた、大径孔に嵌合す
る外周側オイルシール部と、 本体部の軸方向外側の内周部に設けた、インナチューブ
の外周に摺接する内周側ダストシールリップ部とを有し
てなる車両用緩衝器の密封装置。3. An inner tube is slidably inserted into an outer tube, and hydraulic oil is sealed inside the outer tube and the inner tube. A large diameter is provided at an open end of the outer tube into which the inner tube is inserted. A sealing device for a shock absorber for a vehicle, comprising a hole and a concave groove provided on an inner periphery of the large-diameter hole, the annular body being fitted to the large-diameter hole. And a notch formed radially outward from the main body, and capable of elastically expanding and contracting in the radial direction and engaging with the concave groove; and an inner peripheral portion of the main body in the axial direction. An annular support portion bent on the side, an inner peripheral oil seal lip portion provided on the support portion for sliding contact with the outer periphery of the inner tube, and a large-diameter hole provided on an outer peripheral portion on the inner side in the axial direction of the main body portion. Outer side oil seal part that fits with the inside of the body part on the outside in the axial direction Provided, the vehicle shock absorber of a sealing device comprising a and an inner peripheral side dust seal lip portion in sliding contact with the outer periphery of the inner tube.
た、大径孔に嵌合する外周側ダストシール部を有してな
る請求項3記載の車両用緩衝器の密封装置。4. The sealing device for a shock absorber for a vehicle according to claim 3, further comprising an outer peripheral side dust seal portion provided in an outer peripheral portion of the main body portion on the outer side in the axial direction and fitted to a large-diameter hole.
を、該本体部の内周に接するように折曲げ、その折曲げ
の先端部を径方向内方に折曲げて形成された請求項1〜
4のいずれかに記載の車両用緩衝器の密封装置。5. The support portion is formed by bending an axially inner end of a main body portion so as to be in contact with an inner periphery of the main body portion, and bending a tip end of the bend radially inward. Claim 1
The sealing device for a shock absorber for a vehicle according to any one of Claims 4.
部を、径方向内方に折曲げて形成された請求項1〜4の
いずれかに記載の車両用緩衝器の密封装置。6. The sealing device for a shock absorber for a vehicle according to claim 1, wherein the support portion is formed by bending an intermediate portion in the axial direction of the main body portion inward in the radial direction.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000052753A JP3813782B2 (en) | 2000-02-29 | 2000-02-29 | Vehicle shock absorber sealing device |
IDP20000932D ID29364A (en) | 2000-02-29 | 2000-10-30 | EQUIPMENT REDUCING SHOCK VEHICLE FOR VEHICLES |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000052753A JP3813782B2 (en) | 2000-02-29 | 2000-02-29 | Vehicle shock absorber sealing device |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2001241554A true JP2001241554A (en) | 2001-09-07 |
JP2001241554A5 JP2001241554A5 (en) | 2005-07-28 |
JP3813782B2 JP3813782B2 (en) | 2006-08-23 |
Family
ID=18574220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000052753A Expired - Fee Related JP3813782B2 (en) | 2000-02-29 | 2000-02-29 | Vehicle shock absorber sealing device |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP3813782B2 (en) |
ID (1) | ID29364A (en) |
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JP2005054943A (en) * | 2003-08-06 | 2005-03-03 | Showa Corp | Front fork of motorcycle or the like |
JP2005308204A (en) * | 2004-03-26 | 2005-11-04 | Nok Corp | Oil seal |
JP2006300312A (en) * | 2005-03-24 | 2006-11-02 | Nok Corp | Sealing device |
JP2011513658A (en) * | 2008-02-29 | 2011-04-28 | アクツィエブーラゲート エスケイエフ | sticker |
JP2011126383A (en) * | 2009-12-16 | 2011-06-30 | Nissin Kogyo Co Ltd | Negative pressure booster and method for manufacturing the same |
WO2013044504A1 (en) * | 2011-09-30 | 2013-04-04 | 长沙中联重工科技发展股份有限公司 | Sealing structure |
WO2017122539A1 (en) * | 2016-01-13 | 2017-07-20 | Nok株式会社 | Sealing device |
CN114667404A (en) * | 2019-11-22 | 2022-06-24 | Kyb摩托车减震器株式会社 | Buffer device |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102348134B1 (en) * | 2019-12-16 | 2022-01-06 | 평화오일씰공업 주식회사 | Oil seal and apparatus with the same |
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JPS57187291U (en) * | 1981-05-25 | 1982-11-27 | ||
JPS6065422U (en) * | 1983-10-14 | 1985-05-09 | 日産自動車株式会社 | Bearing device with bearing and grease seal |
JPS6281765U (en) * | 1985-11-06 | 1987-05-25 | ||
JPS6356338U (en) * | 1986-09-30 | 1988-04-15 | ||
JPH02114262U (en) * | 1989-02-28 | 1990-09-12 | ||
JPH0341263U (en) * | 1989-08-30 | 1991-04-19 | ||
JPH08193661A (en) * | 1995-01-13 | 1996-07-30 | Jatco Corp | Oil seal device and discharge valve |
JPH09287665A (en) * | 1996-04-22 | 1997-11-04 | Nok Corp | Dust seal and seal structure of front fork for two-wheeler |
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2000
- 2000-02-29 JP JP2000052753A patent/JP3813782B2/en not_active Expired - Fee Related
- 2000-10-30 ID IDP20000932D patent/ID29364A/en unknown
Patent Citations (8)
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JPS57187291U (en) * | 1981-05-25 | 1982-11-27 | ||
JPS6065422U (en) * | 1983-10-14 | 1985-05-09 | 日産自動車株式会社 | Bearing device with bearing and grease seal |
JPS6281765U (en) * | 1985-11-06 | 1987-05-25 | ||
JPS6356338U (en) * | 1986-09-30 | 1988-04-15 | ||
JPH02114262U (en) * | 1989-02-28 | 1990-09-12 | ||
JPH0341263U (en) * | 1989-08-30 | 1991-04-19 | ||
JPH08193661A (en) * | 1995-01-13 | 1996-07-30 | Jatco Corp | Oil seal device and discharge valve |
JPH09287665A (en) * | 1996-04-22 | 1997-11-04 | Nok Corp | Dust seal and seal structure of front fork for two-wheeler |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005054943A (en) * | 2003-08-06 | 2005-03-03 | Showa Corp | Front fork of motorcycle or the like |
JP4492999B2 (en) * | 2003-08-06 | 2010-06-30 | 株式会社ショーワ | Front forks such as motorcycles |
JP2005308204A (en) * | 2004-03-26 | 2005-11-04 | Nok Corp | Oil seal |
JP2006300312A (en) * | 2005-03-24 | 2006-11-02 | Nok Corp | Sealing device |
JP2011513658A (en) * | 2008-02-29 | 2011-04-28 | アクツィエブーラゲート エスケイエフ | sticker |
JP2011126383A (en) * | 2009-12-16 | 2011-06-30 | Nissin Kogyo Co Ltd | Negative pressure booster and method for manufacturing the same |
WO2013044504A1 (en) * | 2011-09-30 | 2013-04-04 | 长沙中联重工科技发展股份有限公司 | Sealing structure |
WO2017122539A1 (en) * | 2016-01-13 | 2017-07-20 | Nok株式会社 | Sealing device |
CN114667404A (en) * | 2019-11-22 | 2022-06-24 | Kyb摩托车减震器株式会社 | Buffer device |
CN114667404B (en) * | 2019-11-22 | 2024-03-29 | Kyb摩托车减震器株式会社 | Buffer device |
Also Published As
Publication number | Publication date |
---|---|
JP3813782B2 (en) | 2006-08-23 |
ID29364A (en) | 2001-08-30 |
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