JPH0249405Y2 - - Google Patents
Info
- Publication number
- JPH0249405Y2 JPH0249405Y2 JP1984152043U JP15204384U JPH0249405Y2 JP H0249405 Y2 JPH0249405 Y2 JP H0249405Y2 JP 1984152043 U JP1984152043 U JP 1984152043U JP 15204384 U JP15204384 U JP 15204384U JP H0249405 Y2 JPH0249405 Y2 JP H0249405Y2
- Authority
- JP
- Japan
- Prior art keywords
- inner cylinder
- seat pipe
- collar
- gas chamber
- cylinder
- 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.)
- Expired
Links
- 239000006096 absorbing agent Substances 0.000 claims description 8
- 230000035939 shock Effects 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 18
- 239000010720 hydraulic oil Substances 0.000 description 5
- 238000013016 damping Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Fluid-Damping Devices (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は自動二輪車のフロントフオーク等とし
て用いる緩衝器に関する。[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a shock absorber used as a front fork of a motorcycle, etc.
（従来の技術）
自動二輪車のフロントフオークとして、内・外
筒を摺動自在に嵌合し、外筒底部に植設したシー
トパイプの拡径上端部を内筒内周面に摺接せし
め、内筒内の上部にカラーを設け、このカラー下
端部とシートパイプ上端部との間にスプリングを
介設し、更に内部に油を封入し、内筒内上部を気
体室とした型式のものが知られている。(Prior art) As a front fork for a motorcycle, an inner and an outer cylinder are slidably fitted together, and the enlarged diameter upper end of a seat pipe planted at the bottom of the outer cylinder is brought into sliding contact with the inner peripheral surface of the inner cylinder. There is a model in which a collar is provided at the upper part of the inner cylinder, a spring is interposed between the lower end of this collar and the upper end of the seat pipe, oil is further sealed inside, and the upper part of the inner cylinder is used as a gas chamber. Are known.
そして斯る型式の緩衝器にあつては、内筒の外
筒内への摺動に伴う内容積の変化を気体室の容積
の変化にて吸収するようにしている。 In this type of shock absorber, changes in internal volume caused by sliding of the inner cylinder into the outer cylinder are absorbed by changes in the volume of the gas chamber.
（考案が解決しようとする問題点）
ところで上記した型式の緩衝器にあつては、気
体室のエアー反力を抑えた方が乗心地性が向上す
る傾向がある。このためには気体室の内容積を大
きくすれば良いのであるが、緩衝器のサイズはこ
れを取付ける機種によつて定まつてしまい、気体
室のみの内容積を大きくすることは困難であり、
特に最近ではストロークアツプ化の中で内容積の
不足が問題となつている。(Problems to be Solved by the Invention) In the case of the above-mentioned type of shock absorber, the riding comfort tends to be improved by suppressing the air reaction force in the gas chamber. To achieve this, it is possible to increase the internal volume of the gas chamber, but the size of the buffer is determined by the model in which it is installed, and it is difficult to increase the internal volume of the gas chamber alone.
Particularly recently, with the increasing stroke size, the lack of internal volume has become a problem.
（問題点を解決するための手段）
上記問題点を解決すべく本考案は、スプリング
荷重を支持すべく内筒内上部に設けられる筒状の
カラーにほぼ全周にわたり前記気体室の容積を大
きくするための肉抜き穴を形成し内筒内上部に形
成される気体室の容積アツプを図つた。(Means for solving the problem) In order to solve the above problem, the present invention increases the volume of the gas chamber over almost the entire circumference of the cylindrical collar provided at the upper part of the inner cylinder to support the spring load. A hollow hole was formed to increase the volume of the gas chamber formed in the upper part of the inner cylinder.
（実施例）
以下に本考案はの実施例を添付図面に基づいて
説明する。(Example) An example of the present invention will be described below based on the accompanying drawings.
第１図は本考案に係る緩衝器を自動二輪車のフ
ロントフオークとして適用した例を示す半截断面
図である。 FIG. 1 is a half-cut sectional view showing an example in which the shock absorber according to the present invention is applied as a front fork of a motorcycle.
第１図に示すフロントフオーク１において２は
外筒であり、該外筒２の内部には上方より内筒３
が上下摺動自在に嵌合している。 In the front fork 1 shown in FIG. 1, 2 is an outer cylinder, and an inner cylinder 3 is inserted into the outer cylinder 2 from above.
are fitted so that they can slide up and down.
上記外筒２内底部にはシートパイプ４がボルト
５及びオイルロツクピース６を介して植設されて
おり、該シートパイプ４の上端拡径部４ａは図示
の如く内筒３の内周に摺接している。尚このシー
トパイプ４の下部には複数の油孔４ｂ…が穿設さ
れている。 A seat pipe 4 is installed at the inner bottom of the outer cylinder 2 via a bolt 5 and an oil lock piece 6, and the enlarged diameter portion 4a at the upper end of the seat pipe 4 slides on the inner circumference of the inner cylinder 3 as shown in the figure. are in contact with each other. Incidentally, a plurality of oil holes 4b are bored in the lower part of the seat pipe 4.
また、前記内筒３の外周面と外筒２の内周面と
の間には油路７が形成され、内筒３の中間部には
油孔３ａが下部には油孔３ｂがそれぞれ穿設さ
れ、更に内筒３の下端部内周面にはシートパイプ
４外周面と摺接するチエツクバルブ機構８を設
け、このチエツクバルブ機構８を設け、このチエ
ツクバルブ機構８と拡径部４ａとの間にリバウン
ドスプリング９を配設している。 Further, an oil passage 7 is formed between the outer circumferential surface of the inner cylinder 3 and the inner circumferential surface of the outer cylinder 2, and an oil hole 3a is bored in the middle part of the inner cylinder 3, and an oil hole 3b is bored in the lower part. Furthermore, a check valve mechanism 8 is provided on the inner circumferential surface of the lower end of the inner cylinder 3 and is in sliding contact with the outer circumferential surface of the seat pipe 4. A rebound spring 9 is arranged in the.
また、前記外筒２の上端内周部には内筒３外周
に摺接するオイルシール１０が嵌装され、外筒２
の上端部は同じく内筒３外筒に摺接するダストシ
ール１１にて閉塞されている。 Further, an oil seal 10 that slides on the outer circumference of the inner cylinder 3 is fitted to the inner circumference of the upper end of the outer cylinder 2.
The upper end of the inner cylinder 3 is similarly closed with a dust seal 11 that slides into contact with the outer cylinder.
一方、内筒３の上端はこれに螺着されるフオー
クボルト１２にて閉塞され、且つ内筒３内の上部
には筒状のカラー１３が設けられ、このカラー１
３下端の内方へ折曲したフランジ部１３ａと前記
シートパイプ４の上端拡径部４ａとの間にスプリ
ング１４を介装している。 On the other hand, the upper end of the inner cylinder 3 is closed with a fork bolt 12 screwed thereto, and a cylindrical collar 13 is provided at the upper part of the inner cylinder 3.
A spring 14 is interposed between the inwardly bent flange portion 13a at the lower end of the seat pipe 4 and the enlarged diameter portion 4a at the upper end of the seat pipe 4.
カラー１３は第２図に示す如く、多数の肉抜き
穴１３ｂ…が形成され、スプリング１４を支持す
るに十分な強度を保持しつつ内容積の向上と軽量
化を図つている。 As shown in FIG. 2, the collar 13 is formed with a large number of lightening holes 13b, and is designed to increase internal volume and reduce weight while maintaining sufficient strength to support the spring 14.
而してフロントフオーク１の内部は図示の如く
シートパイプ内・外室S1，S2及び上部室S3に区画
されており、これら各室S1，S2，S3には作動油が
封入されており、特に上部室S3の上部は気体で占
められている気体室S′3が形成されている。 As shown in the figure, the interior of the front fork 1 is divided into seat pipe inner/outer chambers S 1 , S 2 and upper chamber S 3 , and each of these chambers S 1 , S 2 , S 3 is filled with hydraulic oil. A gas chamber S′ 3 is formed in which the upper portion of the upper chamber S 3 is filled with gas.
次に本フロートフオーク１の作用を説明する。 Next, the function of this float fork 1 will be explained.
まず圧縮工程において、内筒３が外筒２及びシ
ートパイプに対して下動すれば、シートパイプ外
室S2の容積が減少し、この容積減少分の作動油
が、その一部がシートパイプ４に穿設した油孔４
ｂを介してシートパイプ内室S1に流入し、他の一
部はチエツクバルブ機構８、油孔３ｂ、油路７及
び油孔３ａを介して上部室S3に流入し、内室S1に
流入した作動油はシートパイプ４の上端開口部か
ら上部室S3に流入する。そして、作動油が油孔４
ｂ，３ｂ，３ａを通過する際の抵抗により、減衰
力が発生し、且つ内筒３の外筒２内への侵入体積
分だけ気体室３′3の容積が減少する。 First, in the compression process, when the inner cylinder 3 moves downward relative to the outer cylinder 2 and the seat pipe, the volume of the seat pipe outer chamber S 2 decreases, and part of the hydraulic oil corresponding to this volume reduction is transferred to the seat pipe. Oil hole 4 drilled in 4
The other part flows into the upper chamber S3 through the check valve mechanism 8, oil hole 3b, oil passage 7 and oil hole 3a, and the other part flows into the upper chamber S1 through the check valve mechanism 8, oil hole 3b, oil passage 7 and oil hole 3a . The hydraulic oil that has flowed into the seat pipe 4 flows into the upper chamber S3 from the upper end opening of the seat pipe 4. Then, the hydraulic oil is in the oil hole 4.
A damping force is generated due to the resistance when passing through b, 3b, and 3a, and the volume of the gas chamber 3' 3 is reduced by the amount of intrusion of the inner cylinder 3 into the outer cylinder 2.
一方、伸長行程においては、外室S2の容積が増
大するため、この容積増大分だけ上部室S3内の作
動油が、内室S1及び油孔４ａを介して外室S2内に
流入し、油孔４ａを通過する際の抵抗により減衰
力を発生する。 On the other hand, in the extension stroke, the volume of the outer chamber S 2 increases, so the hydraulic oil in the upper chamber S 3 flows into the outer chamber S 2 through the inner chamber S 1 and the oil hole 4a. A damping force is generated due to resistance when the oil flows in and passes through the oil hole 4a.
第３図はカラー１３の別実施例を示すものであ
り、この実施例にあつては肉抜き穴１３ｂを円形
とせず、カラー１３の軸方向に沿つた長孔状とし
ている。 FIG. 3 shows another embodiment of the collar 13. In this embodiment, the lightening hole 13b is not circular but is shaped like a long hole along the axial direction of the collar 13.
（考案の効果）
以上に説明した如く本考案によれば内筒を外筒
に対し摺動自在とするとともに内筒内の上部にス
プリング支持用の筒状のカラーを設け、且つ内筒
内の上部を気体室とした緩衝器において、該カラ
ーにほぼ全周にわたり前記気体室の容積を大きく
するための肉抜き穴を設けたので、緩衝器全体の
軽量化を図れ、且つ気体室の容積を大きくするこ
とができるため、乗心地性が向上する。(Effects of the invention) As explained above, according to the invention, the inner cylinder is made to be slidable relative to the outer cylinder, a cylindrical collar for spring support is provided at the upper part of the inner cylinder, and In a shock absorber with a gas chamber in the upper part, a hollow hole is provided in the collar almost all around the circumference to increase the volume of the gas chamber, so that the overall weight of the shock absorber can be reduced, and the volume of the gas chamber can be reduced. Since it can be made larger, riding comfort improves.
第１図は本考案に係る緩衝器の半截断面図、第
２図及び第３図はカラーの全体斜視図である。
尚、図面中１はフロントフオーク、２は外筒、
３は内筒、S′３は気体室、４はシートパイプ、１
３はカラー、１３ｂは肉抜き穴、１４はスプリン
グである。
FIG. 1 is a half-cut sectional view of a shock absorber according to the present invention, and FIGS. 2 and 3 are overall perspective views of the collar. In addition, in the drawing, 1 is the front fork, 2 is the outer cylinder,
3 is the inner cylinder, S'3 is the gas chamber, 4 is the seat pipe, 1
3 is a collar, 13b is a hollow hole, and 14 is a spring.
Claims (1)
設したシートパイプ上端部を内筒内周面に摺接せ
しめ、このシートパイプ上端にその下端が支持さ
れるスプリングの上端と、内筒上端との間に筒状
のカラーを介設し、このカラーの内側に気体室を
形成した緩衝器において、前記カラーには前記気
体室に連通するための肉抜き穴が形成されている
ことを特徴とする緩衝器。 The inner cylinder and the outer cylinder are slidably fitted together, and the upper end of a seat pipe planted in the bottom of the outer cylinder is brought into sliding contact with the inner peripheral surface of the inner cylinder, and the upper end of the spring is supported by the upper end of the seat pipe. In a shock absorber in which a cylindrical collar is interposed between the inner cylinder and the upper end of the inner cylinder, and a gas chamber is formed inside the collar, a hollow hole is formed in the collar to communicate with the gas chamber. A buffer characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984152043U JPH0249405Y2 (en) | 1984-10-08 | 1984-10-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984152043U JPH0249405Y2 (en) | 1984-10-08 | 1984-10-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6167092U JPS6167092U (en) | 1986-05-08 |
| JPH0249405Y2 true JPH0249405Y2 (en) | 1990-12-26 |
Family
ID=30710131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984152043U Expired JPH0249405Y2 (en) | 1984-10-08 | 1984-10-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0249405Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58157887U (en) * | 1982-04-16 | 1983-10-21 | 株式会社昭和製作所 | Front fork gas spring characteristic adjustment mechanism |
| JPS59131392U (en) * | 1983-02-23 | 1984-09-03 | 株式会社昭和製作所 | front fork |
-
1984
- 1984-10-08 JP JP1984152043U patent/JPH0249405Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6167092U (en) | 1986-05-08 |
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