JPS6058076B2 - motorcycle front fork - Google Patents
motorcycle front forkInfo
- Publication number
- JPS6058076B2 JPS6058076B2 JP21549281A JP21549281A JPS6058076B2 JP S6058076 B2 JPS6058076 B2 JP S6058076B2 JP 21549281 A JP21549281 A JP 21549281A JP 21549281 A JP21549281 A JP 21549281A JP S6058076 B2 JPS6058076 B2 JP S6058076B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- piston
- attachment
- fork
- front fork
- 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
Landscapes
- Axle Suspensions And Sidecars For Cycles (AREA)
- Fluid-Damping Devices (AREA)
Description
【発明の詳細な説明】
本発明はオートバイに制動をかけると慣性で搭乗者の
体重がハンドルに加えられ、これが沈み込むのを防止す
るフロントフォークに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front fork that prevents the rider's weight from sinking into the handlebars due to inertia when the motorcycle is braked.
オートバイの走行中に制動をかけると慣性で搭乗者の
体重がハンドルに加えられ、これが沈み込むために操縦
の安定性が損われる。When braking while a motorcycle is in motion, the rider's weight is added to the handlebars due to inertia, causing the rider to sink into the handlebars, impairing the stability of steering.
本発明は、このようなハンドルの沈み込みを防止し、
かつその状態で路面から衝撃を受けたときは緩衝作用を
維持し得ると共に、応答性が良好で、しかも制御機構の
油と緩衝機構の油とを確実に分離し得るフロントフォー
クを提供するものである。The present invention prevents such sinking of the handle,
To provide a front fork that can maintain a shock absorbing effect when subjected to a shock from a road surface in that state, has good response, and can reliably separate oil in a control mechanism and oil in a shock absorbing mechanism. be.
以下本発明の一実施例を図面により詳細に説明する。
図は、本発明フロントフォークの一実施例を示す要部の
縦断面図で、上端をオートバイのハンドルに取付けたフ
ォークパイプ1の下部をボトムケース2の内側に摺動自
在に嵌合し、かつボトムケース2の底面に植設したシー
トパイプ3の上端を前記フォークパイプ1の内側に摺動
自在に嵌合して、シートパイプ3上に上端とフォークパ
イプ1の上部との間に車体懸架ばね4を張架してある。An embodiment of the present invention will be described in detail below with reference to the drawings.
The figure is a vertical cross-sectional view of the essential parts of a front fork according to an embodiment of the present invention, in which the lower part of a fork pipe 1 whose upper end is attached to the handlebar of a motorcycle is slidably fitted inside a bottom case 2. The upper end of the seat pipe 3 installed on the bottom surface of the bottom case 2 is slidably fitted inside the fork pipe 1, and a vehicle body suspension spring is mounted on the seat pipe 3 between the upper end and the upper part of the fork pipe 1. 4 is strung up.
このボトムケース2内には油を充填してあり、下端の取
付孔5を前輪の軸を結着するもので、上端にはオイルシ
ール6を設けてある。また、フォークパイプ1の下端に
は逆止弁7を設け、シートパイプ3の上部にオリフィス
8を形成すると共にoリング9を嵌合したオイルロック
ピース10をパイプ3の下端に嵌合して、該パイプ3の
下部並びにオイルロックピース10に油孔11、12を
形成し、かつ該ピース10の上端に皿ばね13で押され
た環状の逆止弁14を設けてある。更にOリング15,
16を介してボトムケース2の側部に取付けられたアタ
ッチメント17に、前記シートバイブ3の内側と外側の
油室を連絡する油路18を設け、該アタッチメントの油
路開放端をケース28で閉塞されている。この油路18
には、中心に流路を備えた弁座19を摺動自在に嵌合し
、該弁座19はOリング20を有する底蓋21との間に
張架されたばね22により上向きに付勢してある。また
、下端のシール材23を上記弁座19に対向させたばね
25によつて上向きに付勢された弁部を有するピストン
24を摺動自在に嵌合して、上記ピストン24に油路1
8の油が漏洩することを防止するためのOリング26を
嵌合してある。更に、シール材23とは反対のピストン
24の上部には穴が軸方向に設けられ、その穴内に中空
の軸体27を緩挿し、その軸体27はケース28に突出
して固定され、ケース28はボルト29でアタッチメン
ト17に取外し可能に螺着される。また、中空部27a
にはばね30によつて中空部27aの弁座31を閉塞す
る球体の弁32がピストンの上端面に設けた例えばピン
のような凸起ピン33によつて弁32が押上げられ、中
空部27aを開口せしめる。そして制動時においてばね
30、弁座31及び球体の弁32とからなる逆止弁機構
を介して、前記ピストン24の背部に制動油圧を作用さ
せて前記弁座19の流路を閉じるのである。また、中空
部27aの上端はケース28内に設けた油室34内と連
結し、この油室34はオートバイの油圧制動機構に連結
された油導管.(図示せず)と連結する。なお、35は
油室34に設けた空気抜き用の栓、36はブレーキ液洩
れ流路、37は作動油の洩れ流路である。上述のフロン
トフォークにおいて、常時は油圧制動機構に連結された
図示しない油導管における丁制動用の油圧が低いために
ピストン24がばね25に押されて弁座19から離隔し
、油路18が開放している。This bottom case 2 is filled with oil and is used to connect the front wheel shaft to a mounting hole 5 at the lower end, and an oil seal 6 is provided at the upper end. Further, a check valve 7 is provided at the lower end of the fork pipe 1, an orifice 8 is formed at the upper part of the seat pipe 3, and an oil lock piece 10 fitted with an O-ring 9 is fitted to the lower end of the pipe 3. Oil holes 11 and 12 are formed in the lower part of the pipe 3 and in the oil lock piece 10, and an annular check valve 14 pushed by a disc spring 13 is provided at the upper end of the piece 10. Furthermore, O-ring 15,
An oil passage 18 connecting the inner and outer oil chambers of the seat vibrator 3 is provided in an attachment 17 attached to the side of the bottom case 2 via an oil passage 16, and the open end of the oil passage of the attachment is closed with a case 28. has been done. This oil passage 18
A valve seat 19 having a flow path in the center is slidably fitted into the valve seat 19, and the valve seat 19 is urged upward by a spring 22 stretched between it and a bottom cover 21 having an O-ring 20. There is. Further, a piston 24 having a valve portion biased upward by a spring 25 with a sealing material 23 at a lower end facing the valve seat 19 is slidably fitted, and an oil passage 1 is fitted into the piston 24.
An O-ring 26 is fitted to prevent the oil from leaking. Furthermore, a hole is provided in the axial direction in the upper part of the piston 24 opposite to the sealing material 23, and a hollow shaft body 27 is loosely inserted into the hole, and the shaft body 27 protrudes and is fixed to the case 28. is removably screwed onto the attachment 17 with a bolt 29. Moreover, the hollow part 27a
The spherical valve 32 which closes the valve seat 31 of the hollow part 27a by the spring 30 is pushed up by a convex pin 33, such as a pin, provided on the upper end surface of the piston, and the valve 32 is pushed up by the protruding pin 33, which is provided on the upper end surface of the piston. 27a is opened. During braking, braking oil pressure is applied to the back of the piston 24 via a check valve mechanism consisting of a spring 30, a valve seat 31, and a spherical valve 32 to close the flow path of the valve seat 19. Further, the upper end of the hollow portion 27a is connected to the inside of an oil chamber 34 provided in the case 28, and this oil chamber 34 is an oil conduit connected to the hydraulic braking mechanism of the motorcycle. (not shown). Note that 35 is an air vent plug provided in the oil chamber 34, 36 is a brake fluid leakage path, and 37 is a hydraulic fluid leakage path. In the above-mentioned front fork, since the hydraulic pressure for braking in the oil conduit (not shown) connected to the hydraulic braking mechanism is usually low, the piston 24 is pushed by the spring 25 and separated from the valve seat 19, and the oil passage 18 is opened. are doing.
従つて路面から受ける衝撃でフォークバイブ1が下方へ
移動すると逆止弁7が上昇し、該バイブの下部の油が弁
7の上面に形成した−半径方向の凹溝を通つてその上部
へ移動すると共に前記油路18を通つてシートバイブ3
の内部へ流入し、更に該バイブを通つてその上部へ流出
する。このため比較的小さい減衰力によつてフロントフ
ォークは容易に圧縮される。次に、そのフォークがばね
4の力で伸長し始めると逆止弁7が図のように閉じるか
らフォークバイブ1の下部とシートバイブ3の上部との
間の油がオリフィス8から該シートバイブの内部へ噴出
して大きな減衰力が発生し、かつ弁14が上昇するから
油孔11を通つてフォークバイブ1の下部へ油が補給さ
れる。また図の状態で走行中に制動をかけると、その制
動機構の油圧が上昇し、該油圧が油導管を介jして油室
34に伝達される。従つて軸体27の中空部27aを介
しての油圧によつてピストン24が図の下方へ移動し、
ばね25が圧縮されてピストン24のシール材23が弁
座19に圧接するから、油路18が閉じられる。このた
め搭乗者の慣性によつてハンドルに加わる荷重でフォー
クバイブ1が下方へ移動すると、該バイブの下部の油が
逆止弁7の上面の溝を通つてその上部へ移動すると共に
油の中へ侵入したフォークバイブの体積に相当する油は
オリフィス8からシートバイブ3の内部へ噴出する。す
なわち極めて大きな減衰力が発生するから、フロントフ
ォークの圧縮が阻止されてハンドルの沈み込みが防止さ
れ、安定な操縦性を維持することができる。かつこの状
態て路面から衝撃を受けると、フォークバイブ1に更に
荷重が加わつて、その下部の油圧が著しく上昇するため
に、弁座19がはね22の弾力に抗して下降し、シール
材23と該弁座との間に間隙ができる。すなわち油路1
8が開放するから、シートバイブ3の外側の油がこの油
路18及び油孔11,12を通つてその内側へ移動し、
フォークバイブ1が比較的容易に圧縮されて、前記衝撃
を吸収する。また上昇行程では弁14が開いてフォーク
バイブ1の下部へ油が容易に補給されるから、路面の凹
凸による衝撃に対しては有効に緩衝作用が得られる。以
上実施例について説明したように本発明のフロントフォ
ークは制動をかけた場合におけるハンドルの沈み込みを
防止して、しかもその状態で路面から受ける衝撃に対し
ては有効に緩衝作用を維持する。Therefore, when the fork vibrator 1 moves downward due to the impact received from the road surface, the check valve 7 rises, and the oil in the lower part of the vibrator moves to the upper part through the radial groove formed on the upper surface of the valve 7. At the same time, the seat vibrator 3 passes through the oil passage 18.
The liquid flows into the inside of the vibrator and further flows out through the vibrator to the upper part thereof. Therefore, the front fork is easily compressed by a relatively small damping force. Next, when the fork starts to extend due to the force of the spring 4, the check valve 7 closes as shown in the figure, so oil between the lower part of the fork vibrator 1 and the upper part of the seat vibrator 3 flows from the orifice 8 to the seat vibrator. Since the oil is ejected inward and a large damping force is generated, and the valve 14 is raised, oil is supplied to the lower part of the fork vibrator 1 through the oil hole 11. Furthermore, when braking is applied while the vehicle is running in the state shown in the figure, the hydraulic pressure of the braking mechanism increases, and this hydraulic pressure is transmitted to the oil chamber 34 via the oil conduit j. Therefore, the piston 24 is moved downward in the figure by the hydraulic pressure through the hollow part 27a of the shaft body 27,
Since the spring 25 is compressed and the sealing material 23 of the piston 24 comes into pressure contact with the valve seat 19, the oil passage 18 is closed. Therefore, when the fork vibrator 1 moves downward due to the load applied to the handle due to the inertia of the rider, the oil in the lower part of the vibrator moves to the upper part through the groove on the upper surface of the check valve 7, and inside the oil. The oil corresponding to the volume of the fork vibrator that has entered into the fork vibrator is ejected from the orifice 8 into the interior of the seat vibrator 3. In other words, since an extremely large damping force is generated, compression of the front fork is prevented, the steering wheel is prevented from sinking, and stable maneuverability can be maintained. In addition, when an impact is received from the road surface in this state, an additional load is applied to the fork vibrator 1, and the oil pressure at the bottom of the fork vibrator increases significantly, causing the valve seat 19 to descend against the elasticity of the spring 22, causing the sealing material to fall. A gap is created between 23 and the valve seat. That is, oil path 1
8 opens, the oil on the outside of the seat vibrator 3 moves to the inside through this oil passage 18 and oil holes 11 and 12,
The fork vibrator 1 is compressed relatively easily and absorbs the impact. Further, in the upward stroke, the valve 14 opens and oil is easily replenished to the lower part of the fork vibrator 1, so that an effective buffering effect can be obtained against shocks caused by unevenness of the road surface. As described above with respect to the embodiments, the front fork of the present invention prevents the steering wheel from sinking when braking is applied, and also maintains an effective buffering effect against the impact received from the road surface in this state.
かつ制動機構の油圧を利用してハンドルの沈み込みを防
止するから、応答性が高く確実に動作する。またフロン
トフォークの油と制動機構の油とは完全に分離され、そ
の上ケースとアタッチメントは取外しが自由で且それぞ
れの作動油が洩れ出ることもなく、従つて保守、整備な
どの作業性が優れている等の効果がある。Moreover, since the hydraulic pressure of the braking mechanism is used to prevent the handle from sinking, the handle is highly responsive and operates reliably. In addition, the oil in the front fork and the oil in the braking mechanism are completely separated, and the case and attachments can be removed freely, and each hydraulic oil does not leak, making maintenance and servicing easier. There are effects such as
図は本発明に係るオートバイのフロントフォークの一実
施例を示す縦断面図である。
1・・・・・フォークバイブ、2・・・・・ボトムケー
ス、3・・・・・・シートバイブ、4・・・・・・車体
懸架ばね、7・・・・・・逆止弁、8・・・・・オリフ
ィス、10・・・・・・オイルロックピース、11,1
2・・・・・油孔、14・・・・・・弁、17・・・・
・・アタッチメント、18・・・・・油路、19・・・
・・弁座、22・・・・・・ばね、23・・・・・・シ
ール材、24・・・・ピストン、25・・・・・・ばね
、26・・・・・0リング、27・・・・・軸体、28
・・・・・・ケース、30・・・・・・ばね、31・・
・・・・弁座、32・・・・・・球体の弁、33・・ピ
ン、34・・・・・・油室。The figure is a longitudinal cross-sectional view showing an embodiment of the front fork of a motorcycle according to the present invention. 1...Fork vibe, 2...Bottom case, 3...Seat vibe, 4...Vehicle suspension spring, 7...Check valve, 8... Orifice, 10... Oil lock piece, 11,1
2...Oil hole, 14...Valve, 17...
... Attachment, 18... Oil path, 19...
... Valve seat, 22 ... Spring, 23 ... Seal material, 24 ... Piston, 25 ... Spring, 26 ... 0 ring, 27 ...Shaft body, 28
...Case, 30...Spring, 31...
... Valve seat, 32 ... Ball valve, 33 ... Pin, 34 ... Oil chamber.
Claims (1)
、該ボトムケースの底面に植設したシートパイプの上端
を上記フォークパイプの内側に嵌合し、該ボトムケース
の側部にアタッチメントを取付け、上記ボトムケースと
アタッチメントに前記シートパイプの内側と外側の油室
を連絡する油路を設け、このアタッチメントの上壁開口
部をケースで閉塞してなるオートバイのフロントフォー
クにおいて、ばねで上向きに付勢され且つ中心に流路を
備える弁座と、該弁座に対向して弁部を有しばねで上向
きに付勢され且つアタッチメントの上壁と係合するピス
トンとを上記油路に摺動自在に嵌合し、該ピストンの上
端面には突起を形成し、前記ケースをアタッチメントか
ら分離した時には閉じられ、アタッチメントに装着した
時には前記ピストンの突起により開く逆止弁と中央を貫
通する中空部とを備えた軸体を前記ケースに固定すると
共に、前記軸体の中空部を油導管を介して油圧制動機構
に連絡し、該中空部及び逆止弁を介して前記ピストンの
背部に制御油圧を作用させて前記弁座の流路を閉じるこ
とができるように構成したことを特徴とするオートバイ
のフロントフォーク。1. Fit the fork pipe slidably into the bottom case, fit the upper end of the seat pipe planted on the bottom of the bottom case inside the fork pipe, and attach the attachment to the side of the bottom case, In a front fork of a motorcycle, an oil passage connecting the inner and outer oil chambers of the seat pipe is provided in the bottom case and the attachment, and the upper wall opening of the attachment is closed with the case, and the front fork is biased upward by a spring. A valve seat having a flow path in the center thereof, and a piston having a valve portion facing the valve seat, biased upward by a spring, and engaging with the upper wall of the attachment are slidable into the oil path. a check valve that is fitted into the piston, a protrusion is formed on the upper end surface of the piston, which is closed when the case is separated from the attachment, and opened by the protrusion of the piston when the case is attached to the attachment; and a hollow portion that passes through the center. At the same time, the hollow part of the shaft body is connected to a hydraulic braking mechanism via an oil conduit, and control hydraulic pressure is applied to the back of the piston through the hollow part and a check valve. A front fork for a motorcycle, characterized in that the front fork of a motorcycle is configured to be able to act to close the flow path of the valve seat.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21549281A JPS6058076B2 (en) | 1981-12-28 | 1981-12-28 | motorcycle front fork |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21549281A JPS6058076B2 (en) | 1981-12-28 | 1981-12-28 | motorcycle front fork |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58116285A JPS58116285A (en) | 1983-07-11 |
JPS6058076B2 true JPS6058076B2 (en) | 1985-12-18 |
Family
ID=16673274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21549281A Expired JPS6058076B2 (en) | 1981-12-28 | 1981-12-28 | motorcycle front fork |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6058076B2 (en) |
-
1981
- 1981-12-28 JP JP21549281A patent/JPS6058076B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS58116285A (en) | 1983-07-11 |
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