JPS5970279A - Generator for damping force of front fork - Google Patents
Generator for damping force of front forkInfo
- Publication number
- JPS5970279A JPS5970279A JP17928082A JP17928082A JPS5970279A JP S5970279 A JPS5970279 A JP S5970279A JP 17928082 A JP17928082 A JP 17928082A JP 17928082 A JP17928082 A JP 17928082A JP S5970279 A JPS5970279 A JP S5970279A
- Authority
- JP
- Japan
- Prior art keywords
- front fork
- damping force
- oil
- inner cylinder
- seat
- 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
- Axle Suspensions And Sidecars For Cycles (AREA)
- Fluid-Damping Devices (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
この発明は、自動二輪車等に使用されているフロントフ
ォークにおける減衰力発生装置の改良匠関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved damping force generating device for a front fork used in a motorcycle or the like.
フロントフォークは、一般に自動二輪車の前車輪等を緩
衝方式で支持する緩衝器であり、内筒と外筒が摺動自在
に嵌合され、該外筒内に挿入固定されるシートパイプの
先端に内筒内を摺動自在となす補助ピストンが設けられ
、内部に封入された作動油によシ車輪の上下方向に生じ
る衝撃が緩和される仕組みのものは公知である。A front fork is generally a shock absorber that supports the front wheel of a motorcycle using a shock absorbing method.A front fork is a shock absorber that supports the front wheel of a motorcycle, etc., and has an inner cylinder and an outer cylinder that are slidably fitted together, and a front fork that is attached to the tip of a seat pipe that is inserted and fixed into the outer cylinder. There is a known mechanism in which an auxiliary piston is provided that is slidable inside the inner cylinder, and the impact generated in the vertical direction of the wheel is alleviated by hydraulic oil sealed inside.
この種のフロントフォークは、内筒とシートパイプとの
間に形成された油室を内筒下部内周に嵌装した逆止弁に
よジ上下に区画し、フロントフォークの伸縮に伴ない収
縮側油室からシートパイプに穿設された減衰力発生用の
油孔を経てシートパイプ内油室、膨張側油室へと油を流
動せしめ、車輪の受ける衝撃を吸収緩和していた。この
ため減衰力がフロントフォークの伸縮動作速度の2乗に
比例して増大し、従って伸縮動作速度の低速域において
好ましい減衰力を設定した場合においても、高速域にお
いて減衰力が高めに発生するという不都合を生じ易く、
良好な乗心地を得ることができなかった。In this type of front fork, the oil chamber formed between the inner cylinder and the seat pipe is divided into upper and lower parts by a check valve fitted on the inner periphery of the lower part of the inner cylinder, and the oil chamber contracts as the front fork expands and contracts. Oil flows from the side oil chamber through an oil hole drilled in the seat pipe to generate damping force, to the oil chamber in the seat pipe and to the expansion side oil chamber, absorbing and mitigating the impact received by the wheels. For this reason, the damping force increases in proportion to the square of the front fork's telescopic movement speed, and therefore even if a desirable damping force is set in the low-speed range of the telescopic movement speed, a higher damping force will occur in the high-speed range. Easy to cause inconvenience,
I couldn't get a good ride.
そこで第1図に示す如く、シートパイプ(1)に摺動自
在に環状のバルブシート(2)を嵌合し、該バルブシー
ト(2)の下面中心に突設された円形突起にチェックパ
ルプ(3)を摺動自在に外嵌するとともに、内筒(4)
下端部内周に装入配設されたオイルロックカラー(5)
の上面に形成された円環状突出部(6)により上記チェ
ックパルプ(3)の下面を支持してなる減衰力発生装置
が提案された。なお、バルブシート(2)は、その上面
に半径方向の凹溝を形成し、かつその溝の底面に複数個
の油孔を設けたもので、上面を皿ばね(7)で押圧され
ている。iた(8)はスプリングシートであり内周に油
孔を有する。この減衰力発生装置においてフロントフォ
ークの伸長速度が高く々ると、チェックパルプ(3)が
下方に屈曲して開となり上方の収縮側油室から下方の膨
張側油室へと油は流動する。Therefore, as shown in Fig. 1, an annular valve seat (2) is slidably fitted onto the seat pipe (1), and check pulp ( 3) is slidably fitted on the outside, and the inner cylinder (4)
Oil lock collar (5) installed on the inner circumference of the lower end
A damping force generating device has been proposed in which the lower surface of the check pulp (3) is supported by an annular protrusion (6) formed on the upper surface. The valve seat (2) has a radial groove formed on its upper surface and a plurality of oil holes on the bottom of the groove, and the upper surface is pressed by a disc spring (7). . i (8) is a spring seat and has an oil hole on its inner periphery. In this damping force generating device, when the extension speed of the front fork increases, the check pulp (3) bends downward and opens, and oil flows from the upper contraction side oil chamber to the lower expansion side oil chamber.
また圧縮速度が高くなるとチェックパルプ(3)および
バルブシート(2)が上方に移動し、円環状突出部(6
)とチェックパルプ(3)との間が開となるため下方の
収縮側油室から上方の膨張側油室へと油は流動する。従
って同装置によれば、従来のような伸縮動作速度の高速
域において減衰力が高めに発生ずるという不都合はなく
なる。しかしながら、シートパイプの軸心が内外筒の軸
心とずれて組立てられた際、バルブシートはシートパイ
プに外嵌しているため、内筒内に配設されたオイルロッ
クカラー上面に形成された円環状突出部と上記バルブシ
ート下面外周とでチェックパルプを押すえる力、位置お
よび面積(叶変動し、設計上の減衰力が得られないとい
う問題があった。Furthermore, when the compression speed increases, the check pulp (3) and the valve seat (2) move upward, and the annular protrusion (6) moves upward.
) and the check pulp (3) are opened, so oil flows from the lower contraction side oil chamber to the upper expansion side oil chamber. Therefore, according to this device, there is no longer a problem that the damping force is generated at a high level in the high speed range of the telescoping operation speed as in the conventional art. However, when assembled with the axis of the seat pipe misaligned with the axes of the inner and outer cylinders, the valve seat is fitted onto the seat pipe externally, so the oil lock collar formed on the top surface of the inner cylinder There was a problem in that the force, position, and area of the check pulp pressed by the annular protrusion and the outer periphery of the lower surface of the valve seat varied, making it impossible to obtain the designed damping force.
この発明は上記問題の解消を目的とするフロントフォー
クの減衰力発生装置を提案するもので、内筒下部内周に
内筒とシートパイプとの間に形成された油室を区画する
環状のバルブシートを嵌装し、該バルブシートに油孔を
穿設するとともに伸長時に開動作するチェックパルプお
よび圧縮時に開動作するチェックパルプを設けてなるこ
とを要旨とする。This invention proposes a damping force generating device for a front fork with the aim of solving the above-mentioned problems.The present invention proposes a damping force generating device for a front fork, which includes an annular valve that partitions an oil chamber formed between the inner cylinder and the seat pipe on the inner periphery of the lower part of the inner cylinder. The gist is that a seat is fitted, an oil hole is formed in the valve seat, and a check pulp that opens when expanded and a check pulp that opens when compressed are provided.
以下、この発明の一実施例を第2図、第3図に基づいて
説明する。An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.
第2図はこの発明の一実施例装置を有するフロントフォ
ークの要部を示す縦断正面図、第3図はこの発明の一実
施例を示す拡大図である。(9)は内筒、(10)は外
筒であり、その摺動嵌合部の隙間はオイルシール(11
)によシシールされている。FIG. 2 is a longitudinal sectional front view showing essential parts of a front fork having a device according to an embodiment of the present invention, and FIG. 3 is an enlarged view showing an embodiment of the present invention. (9) is the inner cylinder, (10) is the outer cylinder, and the gap between the sliding fitting portions is the oil seal (11).
).
(12)は外筒(10)内に挿入され、その基端部をボ
ルト(13)にて外筒(10)底部に固定されるととも
に、先端に内筒(9)内を摺動自在となす補助ピストン
(14)を固定してなるシートパイプである。また、該
シートパイプ(12)の基端部にオイルロックピース(
15)を外嵌固着している。一方、内筒(9)下端部内
周に、複数個の油孔(16)を有する円環状のスプリン
グシー)(17)、その内周面とシートパイプ(12)
外周面との間に円環状油路(18)を形成し、かつその
外周側に複数個の油孔(19)を穿設してなるバルブシ
ート(20)、該パルプシー)(20)の下面に当接1
7て油孔(19)を開閉する環状板ばねよりなるチェッ
クパルプ(21)、オイルロックカラー(22)を順次
、装入配設している。々お(23)は円環状油路(18
)を開閉するチェックパルプであシ、スプリング(24
)によって同油路(18)上面に押圧されている。また
(25) (26)はシートパイプ(12)に穿設され
た油孔である。(12) is inserted into the outer cylinder (10), its base end is fixed to the bottom of the outer cylinder (10) with a bolt (13), and the tip is slidable inside the inner cylinder (9). This is a seat pipe with a fixed auxiliary piston (14). Additionally, an oil lock piece (
15) is fitted and fixed on the outside. On the other hand, an annular spring seat (17) having a plurality of oil holes (16) on the inner periphery of the lower end of the inner cylinder (9), and a seat pipe (12) on its inner periphery.
A valve seat (20) having an annular oil passage (18) formed between the valve seat and the outer peripheral surface, and a plurality of oil holes (19) formed on the outer peripheral side of the valve seat, the lower surface of the pulp seat (20). Contact 1
A check pulp (21) made of an annular leaf spring and an oil lock collar (22) which open and close the oil hole (19) are sequentially installed. (23) is a circular oilway (18)
) with check pulp to open and close, spring (24
) is pressed against the upper surface of the oil passage (18). Further, (25) and (26) are oil holes bored in the seat pipe (12).
上記構成よりなるフロントフォークにおいて、フロント
フォークが縮まる圧縮工程では内筒(9)が外筒(10
)内に進入することによシ、外筒内油室の油が油孔(2
6)を経てシートパイプ(12)内へ流入し圧縮速度の
2乗に比例した減衰力が発生する。このとき第3図に示
す如く、内筒(9)とシートパイプ(12)との間に形
成された上・下池室は遮断されているが、圧縮速度が高
くなると下池室の内圧が上がり、スプリング(24)の
弾性力に打ち勝ってチェックパルプ(23)を上方へ押
しやり円環状油路(18)を開くため、下池室から主油
室へと油は流動し、減衰力が極端に上昇することはない
。また伸長工程では補助ピストン(14)の下部油室の
油が油孔(25)を経てシートパイプ(12)内へ流入
するが、伸長速度が高くなるとチェックパルプ(21)
が下方に屈曲して油孔(19)は開となり、主油室から
下池室へと油は流動し、圧縮時同様に減衰力が極端に上
昇することはない。In the front fork having the above configuration, in the compression process in which the front fork is contracted, the inner cylinder (9) is compressed by the outer cylinder (10).
), the oil in the oil chamber inside the outer cylinder flows into the oil hole (2).
6) into the sheet pipe (12), and a damping force proportional to the square of the compression speed is generated. At this time, as shown in Fig. 3, the upper and lower reservoir chambers formed between the inner cylinder (9) and the sheet pipe (12) are blocked, but as the compression speed increases, the internal pressure of the lower reservoir chamber increases. In order to overcome the elastic force of the spring (24) and push the check pulp (23) upward to open the annular oil passage (18), the oil flows from the lower reservoir chamber to the main oil chamber, and the damping force increases extremely. There's nothing to do. In addition, during the extension process, oil in the lower oil chamber of the auxiliary piston (14) flows into the sheet pipe (12) through the oil hole (25), but as the extension speed increases, the check pulp (21)
is bent downward, the oil hole (19) is opened, and the oil flows from the main oil chamber to the lower reservoir chamber, and the damping force does not increase extremely as in the case of compression.
この発明によれば上記の如く、伸縮動作速度の高速域に
おいても減衰力が極端に上昇することはなく、中・大型
車のオンロード車に供される場合、乗心地は大幅に改善
される。またスプリングの強さや板ばねの枚数、厚さ等
によりチェックパルプの開閉、つ′I!、#)減衰力を
任意に調整可能である。According to the present invention, as described above, the damping force does not increase excessively even in the high speed range of the telescopic operation speed, and the ride comfort is significantly improved when used for medium-sized and large-sized on-road vehicles. . Also, the opening and closing of the check pulp depends on the strength of the spring, the number of leaf springs, the thickness, etc. , #) The damping force can be adjusted arbitrarily.
更に、シートパイプの軸心が内外筒の軸心とずれて組立
てられた場合でも、チェックパルプを押さえる力、位置
および面積は変動せず、安定した減衰力を得ることがで
きる。Furthermore, even if the sheet pipe is assembled with its axial center misaligned with the axes of the inner and outer cylinders, the force, position, and area for pressing the check pulp do not change, and a stable damping force can be obtained.
第1図は従来のフロントフォークの減衰力発生装置を示
す拡大図、第2図はこの発明の一実施例装置を有するフ
ロントフォークの要部を示す縦断正面図、第3図はこの
発明の一実施例を示す拡大図である。
図中、9・・・内筒、10・・・外筒、12・・・シー
トパイプ、14・・・補助ピストン、15・・・オイル
ロックピース、16.19.25.26・・・油孔、1
7・・・スプリングシート、18・・・円墳状油路、2
o・・・バルブシート、21.23・・・チェックパル
プ、24・・・スプリング。
特許出願人 株式会社昭和製作所Fig. 1 is an enlarged view showing a conventional damping force generating device for a front fork, Fig. 2 is a longitudinal sectional front view showing the main parts of a front fork having an embodiment of the device of the present invention, and Fig. 3 is an enlarged view showing a damping force generating device of a conventional front fork. It is an enlarged view showing an example. In the figure, 9...Inner cylinder, 10...Outer cylinder, 12...Seat pipe, 14...Auxiliary piston, 15...Oil lock piece, 16.19.25.26...Oil Hole, 1
7... Spring seat, 18... Circular oilway, 2
o...Valve seat, 21.23...Check pulp, 24...Spring. Patent applicant Showa Seisakusho Co., Ltd.
Claims (1)
されるシートパイプの先端に内筒内を摺動自在となす補
助ピストンを設けるととも釦、内部に作動油を封入して
なるフロントフォークにおいて、内筒下部内周に内筒と
シートパイプとの間に形成された油室を区画する環状の
バルブシートを嵌装し、該バルブシートに油孔を穿設す
るとともに伸長時に開動作するチェックバルブおよび圧
縮時に開動作するチェックバルブを設けてなることを特
徴とするフロントフォークの減衰力発生装置。The inner cylinder and the outer cylinder are slidably fitted together, and an auxiliary piston is provided at the tip of a seat pipe that is inserted and fixed into the outer cylinder to allow the inner cylinder to slide freely. In the enclosed front fork, an annular valve seat is fitted on the inner periphery of the lower part of the inner cylinder to partition an oil chamber formed between the inner cylinder and the seat pipe, and an oil hole is bored in the valve seat. A damping force generating device for a front fork, comprising: a check valve that opens during extension; and a check valve that opens during compression.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17928082A JPS5970279A (en) | 1982-10-13 | 1982-10-13 | Generator for damping force of front fork |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17928082A JPS5970279A (en) | 1982-10-13 | 1982-10-13 | Generator for damping force of front fork |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5970279A true JPS5970279A (en) | 1984-04-20 |
JPH0321771B2 JPH0321771B2 (en) | 1991-03-25 |
Family
ID=16063076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17928082A Granted JPS5970279A (en) | 1982-10-13 | 1982-10-13 | Generator for damping force of front fork |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5970279A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5276050U (en) * | 1975-12-04 | 1977-06-07 |
-
1982
- 1982-10-13 JP JP17928082A patent/JPS5970279A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5276050U (en) * | 1975-12-04 | 1977-06-07 |
Also Published As
Publication number | Publication date |
---|---|
JPH0321771B2 (en) | 1991-03-25 |
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