JPH0610491B2 - Shock absorber - Google Patents

Shock absorber

Info

Publication number
JPH0610491B2
JPH0610491B2 JP26818485A JP26818485A JPH0610491B2 JP H0610491 B2 JPH0610491 B2 JP H0610491B2 JP 26818485 A JP26818485 A JP 26818485A JP 26818485 A JP26818485 A JP 26818485A JP H0610491 B2 JPH0610491 B2 JP H0610491B2
Authority
JP
Japan
Prior art keywords
pipe
seat pipe
chamber
oil
shock absorber
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 - Fee Related
Application number
JP26818485A
Other languages
Japanese (ja)
Other versions
JPS62127535A (en
Inventor
貞雄 河村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Showa Co Ltd
Original Assignee
Showa Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Showa Co Ltd filed Critical Showa Co Ltd
Priority to JP26818485A priority Critical patent/JPH0610491B2/en
Publication of JPS62127535A publication Critical patent/JPS62127535A/en
Publication of JPH0610491B2 publication Critical patent/JPH0610491B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32Details
    • F16F9/48Arrangements for providing different damping effects at different parts of the stroke
    • F16F9/49Stops limiting fluid passage, e.g. hydraulic stops or elastomeric elements inside the cylinder which contribute to changes in fluid damping

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
  • Fluid-Damping Devices (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は自動二輪車等に使用する緩衝器に関する。TECHNICAL FIELD The present invention relates to a shock absorber used in a motorcycle or the like.

(従来の技術) 従来自動二輪車の緩衝器として例えば第2図に示すよう
なものがある。
(Prior Art) As a conventional shock absorber for a motorcycle, for example, there is one as shown in FIG.

この緩衝器は、内部に作動油を充填したボトムケース
(51)内に、その下端部をオイルロックピース(53)と
共にボルト(54)で固着されたシートパイプ(52)が植
設され、このシートパイプ(52)の上端部外周面にはシ
ールリング(55)が嵌着され、上下に各々油孔(52
a)、オフィリス(52b)が形成されている。
In this shock absorber, a seat pipe (52) whose bottom end is fixed together with an oil lock piece (53) by a bolt (54) is planted in a bottom case (51) filled with hydraulic oil. A seal ring (55) is fitted on the outer peripheral surface of the upper end portion of the seat pipe (52), and the oil holes (52
a), Ophiris (52b) is formed.

そして、これ等のボトムケース(51)とシートパイプ
(52)との間には、下端部外周にスライドベアリング
(56)が嵌着されたフォークパイプ(57)が摺動自在に
挿通され、このフォークパイプ(57)の下端部内周面に
はオイルロックカラー(58)とリバウンドシート(59)
とが嵌着され、これ等のオイルロックカラー(58)とリ
バウンドシート(59)との間にはフリーバルブ(60)が
遊びを持って保持されている。
A fork pipe (57) having a slide bearing (56) fitted around the lower end is slidably inserted between the bottom case (51) and the seat pipe (52). Oil lock collar (58) and rebound seat (59) on the inner surface of the lower end of the fork pipe (57).
Are fitted and a free valve (60) is held with play between the oil lock collar (58) and the rebound seat (59).

この緩衝器は圧縮行程にあってフォークパイプ(57)が
下降するときには、室(S1)内の作動油の一部がフリー
バルブ(60)を押上げてオイルロックカラー(58)とフ
リーバルブ(60)との間の流路からリバウンドシート
(59)とフリーバルブ(60)との間の環状流路及びリバ
ウンドシート(59)の切欠部(59a)を介して室(S2
に流入すると共に、他の一部はオリフィス(52b)を介
してシートパイプ(52)の内側と通って室(S3)に流れ
る。
When the fork pipe (57) descends in the compression stroke of the shock absorber, a part of the hydraulic oil in the chamber (S 1 ) pushes up the free valve (60) to lift the oil lock collar (58) and the free valve. The chamber (S 2 ) via the annular flow path between the rebound seat (59) and the free valve (60) and the notch (59a) of the rebound seat (59) from the flow path between the rebound seat (59) and the free flow valve (60).
And a part of the other flows into the chamber (S 3 ) through the inside of the seat pipe (52) through the orifice (52b).

(発明が解決しようとする問題点) 上述した緩衝器において圧縮行程で室(S1)内からオリ
フィス(52b)を介してシートパイプ(52)の内側を通
って室(S3)に流出する作動油は、シートパイプ(52)
内の長い管路を流れるために流速が速く矢示A方向に円
筒状になって室(S3)内へ噴出する。
Flowing the through the inner through the orifice (52 b) from the chamber (S 1) in the compression stroke in the (invention Problems to be Solved) above buffer seat pipe (52) chamber (S 3) Hydraulic oil for seat pipe (52)
Since it flows through the long pipe inside, the flow velocity is high and it becomes a cylinder in the direction of arrow A and jets into the chamber (S 3 ).

そのため、押下げられたフォークパイプ(57)が伸び行
程に移り懸架バネの蓄圧エネルギーを放出する際に、上
記圧縮行程で室(S1)からシートパイプ(52)の内側を
通って室(S3)に流出した作動油が矢示A方向に慣性エ
ネルギーを持っているため、シートパイプ(52)の内側
を通って室(S1)内に直ちに戻らず、室(S1)内が負圧
状態になり、フォークパイプ(57)の上昇が遅くなる。
Therefore, when the pushed down fork pipe (57) moves to the extension stroke and releases the energy stored in the suspension spring, it passes through the inside of the seat pipe (52) from the chamber (S 1 ) to the chamber (S Since the hydraulic oil that flowed out to 3 ) has inertial energy in the direction of arrow A, it does not immediately return to the inside of the chamber (S 1 ) through the inside of the seat pipe (52) and the inside of the chamber (S 1 ) becomes negative. A pressure condition is reached and the rise of the fork pipe (57) is delayed.

更に、斯る状態から再び急激に圧縮行程に移ると、作動
油の充填が不充分な状態でフォークパイプ(57)が室
(S1)内に進入するために所要の減衰力が得られなくな
り、緩衝器の応答性が悪くなって安定した減衰力が得ら
れない。
Furthermore, when the compression stroke is suddenly changed again from such a state, the required damping force cannot be obtained because the fork pipe (57) enters the chamber (S 1 ) with insufficient hydraulic oil filling. , The responsiveness of the shock absorber is deteriorated and a stable damping force cannot be obtained.

(問題点を解決するための手段) 上記問題点を解決べく本発明は、ボトムケース内にシー
トパイプを植設し、これらボトムケースとシートパイプ
との間にフォークパイプを摺動自在に挿通してシートパ
イプ外周に油室を形成するとともにシートパイプ上方を
油溜室とした緩衝器において、前記シートパイプを上記
油溜室に開口する2つの通路を有する二重構造とし、一
方の通路には緩衝器の伸張行程でのみ開くチェックバル
ブを介設して同通路を前記油溜室からシートパイプ外周
の油室に作動油を戻す専用の通路とした。
(Means for Solving Problems) In order to solve the above problems, according to the present invention, a seat pipe is planted in a bottom case, and a fork pipe is slidably inserted between the bottom case and the seat pipe. In the shock absorber in which an oil chamber is formed on the outer circumference of the seat pipe and the upper part of the seat pipe is an oil reservoir, the seat pipe has a double structure having two passages opening into the oil reservoir, and one passage has one passage. A check valve that opens only in the extension stroke of the shock absorber is provided so that the passage is a dedicated passage for returning the working oil from the oil reservoir to the oil chamber on the outer periphery of the seat pipe.

(作用) 緩衝器の伸び行程では二重構造のシートパイプの戻り専
用の通路内にある静止状態の作動油が戻って負圧状態に
なることを防止する。
(Operation) During the extension stroke of the shock absorber, the stationary hydraulic oil in the return passage of the double-structured seat pipe is prevented from returning to a negative pressure state.

(実施例) 以下に本発明の実施例を添付図面に基づいて説明する。(Example) Below, the Example of this invention is described based on an accompanying drawing.

第1図は本発明に係る緩衝器の断面図であり、この緩衝
器は、内部に作動油を充填したボトムケース(1)内
に、シートパイプ(2)をその下端部をボルト(5)でボ
トムケース(1)底部に植設している。
FIG. 1 is a cross-sectional view of a shock absorber according to the present invention. This shock absorber has a bottom case (1) filled with hydraulic oil, a seat pipe (2), a lower end of which is a bolt (5). The bottom case (1) is planted at the bottom.

このシートパイプ(2)はシートパイプ本体(3)とサブ
パイプ(4)とからなる二重構造をなし、サブパイプ
(4)はシートパイプ本体(3)の内側に所定の間隔を置
いてシートパイプ本体(3)に対して同軸状となるよう
に下端部をシートパイプ(2)の内周面に形成した突部
(3a)に係着し内外に通路(l1),(l2)を形成してい
る。
This seat pipe (2) has a double structure consisting of a seat pipe body (3) and a sub pipe (4), and the sub pipe (4) is seated inside the seat pipe body (3) with a predetermined interval. The lower end is attached to the projection (3a) formed on the inner peripheral surface of the seat pipe (2) so as to be coaxial with (3), and the passages (l 1 ) and (l 2 ) are formed inside and outside. is doing.

またシートパイプ本体(3)にはサブパイプ(4)との間
で形成される通路(l1)に臨む部位の上下に各々油孔
(6),(7)を形成すると共に、サブパイプ(4)を装
着した部位よりも下方に戻り通路(8)を形成し、更に
シートパイプ本体(3)の外周に伸び側のときに戻り通
路(8)を開くオイルロックピースを兼ねたチェックバ
ルブ(9)を摺動可能に嵌着し、このチェックバルブ
(9)の摺動を規制する部材を兼ねたストッパリング(1
0)をシートパイプ本体(3)に嵌着している。
Further, in the seat pipe body (3), oil holes (6) and (7) are respectively formed above and below the portion facing the passage (l 1 ) formed between the seat pipe body (3) and the sub pipe (4). Check valve (9) that also forms a return passage (8) below the part where the seat is attached and that also serves as an oil lock piece that opens the return passage (8) on the outer periphery of the seat pipe body (3) on the extension side. Stopper ring (1 which also serves as a member that restricts sliding of the check valve (9).
0) is fitted to the seat pipe body (3).

また、シートパイプ本体(3)の上端部に形成したフラ
ンジ部(3b)の外周にはシールリング(11)を嵌着して
いる。
Further, a seal ring (11) is fitted around the outer periphery of a flange portion (3b) formed at the upper end of the seat pipe body (3).

一方、ボトムケース(1)とシートパイプ本体(3)との
間には、下端部外周にスライドベアリング(12)を嵌着
したフォークパイプ(13)を摺動自在に挿通し、このフ
ォークパイプ(13)の下端部内周面にはオイルロックカ
ラー(14)と切欠部(15a)を形成したバウンドシート
(15)とを嵌着して、これ等のオイルロックカラー(1
4)とリバウンドシート(15)との間にフリーバルブ(1
6)をシートパイプ本体(3)に対して遊びを持って保持
している。
On the other hand, a fork pipe (13) having a slide bearing (12) fitted around the lower end is slidably inserted between the bottom case (1) and the seat pipe body (3). An oil lock collar (14) and a bound seat (15) having a cutout (15a) are fitted on the inner peripheral surface of the lower end of (13).
4) Between the rebound seat (15) and the free valve (1
6) is held with play against the seat pipe body (3).

以上の如き構成からなる緩衝器の作用を説明する。The operation of the shock absorber having the above structure will be described.

緩衝器が圧縮行程にあってフォークパイプ(13)が下降
するときには、室(S1)内の作動油の一部はフリーバル
ブ(16)を押上げてオイルロックカラー(14)とフリー
バルブ(16)との間の流路からリバウンドシート(15)
とフリーバルブ(16)との間の環状流路及びリバウンド
シート(15)の切欠部(15a)を介して室(S2)に流入
し、油孔(6)を通って室(S3)に流出し、他の一部は
油孔(7)及び通路(l1)を通って室(S3)内に流れ
る。
When the shock absorber is in the compression stroke and the fork pipe (13) descends, part of the hydraulic oil in the chamber (S 1 ) pushes up the free valve (16) and the oil lock collar (14) and the free valve (13). Rebound seat from the flow path between (16) (15)
Flows into the chamber (S 2 ) through the annular flow path between the free valve (16) and the notch (15a) of the rebound seat (15), and passes through the oil hole (6) to the chamber (S 3 ). And a part of the other flows into the chamber (S 3 ) through the oil hole (7) and the passage (l 1 ).

このとき、通路(l1)を通って室(S3)に流出する作動
油は、長い管路を流れるために流速が速く矢示A方向に
噴出して室(S3)に流出する。
At this time, the hydraulic oil flowing out into the chamber (S 3 ) through the passage (l 1 ) flows through the long pipe line and has a high flow velocity and is ejected in the direction of arrow A to flow out into the chamber (S 3 ).

尚、フォークパイプ(13)はオイルロックカラー(14)
がオイルロックピースを兼ねたチェックバルブ(9)に
当接したときに停止する。
The fork pipe (13) is an oil lock collar (14).
Stops when it comes into contact with the check valve (9) that also functions as an oil lock piece.

そして、押下げられたフォークパイプ(13)が内蔵され
たバネに溜ったエネルギーを放出するために上昇を開始
して伸び行程に移ると室(S1)が減圧状態になる。
Then, when the pushed down fork pipe (13) starts rising to release the energy stored in the built-in spring and moves to the extension stroke, the chamber (S 1 ) is in a decompressed state.

このとき、上記圧縮行程で室(S3)へ流出した作動油は
矢印A方向に慣性エネルギーを持っているためにオフィ
リス(7)を介して室(S1)内に直ちに戻らないが、サ
ブパイプ(4)の内側の通路(l2)内の作動油は静止状
態になっているので、フォークパイプ(13)の上昇によ
る室(S1)の減圧によって直ちに矢印B方向に流れてシ
ートパイプ本体(3)の戻り通路(8)を介してチェック
バルブ(9)を押上げて室(S1)に流入する。
At this time, the hydraulic oil that has flown into the chamber (S 3 ) in the compression stroke does not immediately return to the chamber (S 1 ) through the offillis (7) because it has inertial energy in the direction of arrow A, but the subpipe Since the hydraulic oil in the passage (l 2 ) inside the (4) is in a static state, the pressure in the chamber (S 1 ) due to the rise of the fork pipe (13) immediately causes it to flow in the direction of the arrow B, and the seat pipe main body. The check valve (9) is pushed up through the return passage (8) of (3) and flows into the chamber (S 1 ).

(発明の効果) 以上説明した如く本発明によれば、シートパイプを二重
構造にして、伸び側のときの作動油の戻り専用の通路を
形成したので、伸び側では圧縮のときに流出する流路と
は別の通路から静止状態の作動油が戻るために負圧状態
になることがなく、素早くフォークパイプが上昇し、緩
衝器の応答性が良くなって安定した減衰力が得られる。
(Effects of the Invention) According to the present invention as described above, since the seat pipe has a double structure and the passage for exclusive use for returning the hydraulic oil on the extension side is formed, the sheet flows out during compression on the extension side. Since the stationary hydraulic oil returns from a passage different from the flow passage, a negative pressure state does not occur, the fork pipe rises quickly, the responsiveness of the shock absorber is improved, and a stable damping force is obtained.

【図面の簡単な説明】[Brief description of drawings]

第1図は本発明に係る緩衝器の断面図、第2図は従来の
緩衝器の断面図である。 尚、図面中(1)はボトムケース、(2)はシーウートパイプ
(二重構造)、(3)はシートパイプ本体、(4)はサブパイ
プ、(8)は戻り通路、(9)はチェックバルブ、(13)はフォ
ークパイプ、(S1)は下側油室、(S2)は上側油室、(S3)は
油溜室である。
FIG. 1 is a sectional view of a shock absorber according to the present invention, and FIG. 2 is a sectional view of a conventional shock absorber. In the drawing, (1) is the bottom case, (2) is the sea-out pipe (double structure), (3) is the seat pipe body, (4) is the sub pipe, (8) is the return passage, and (9) is the check. A valve, (13) is a fork pipe, (S1) is a lower oil chamber, (S2) is an upper oil chamber, and (S3) is an oil reservoir.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】ボトムケース内にシートパイプを植設し、
これらボトムケースとシートパイプとの間にフォークパ
イプを摺動自在に挿通してシートパイプ外周に油室を形
成するとともにシートパイプ上方を油溜室とした緩衝器
において、前記シートパイプを上記油溜室に開口する2
つの通路を有する二重構造とし、一方の通路には緩衝器
の伸張行程でのみ開くチェックバルブを介設して同通路
を前記油溜室からシートパイプ外周の油室に作動油を戻
す専用の通路としたことを特徴とする緩衝器。
1. A seat pipe is planted in a bottom case,
In a shock absorber in which a fork pipe is slidably inserted between the bottom case and the seat pipe to form an oil chamber on the outer periphery of the seat pipe and the upper part of the seat pipe is an oil reservoir chamber, the seat pipe is replaced by the oil reservoir. Open to the room 2
It has a double structure with two passages, and one passage is provided with a check valve that opens only in the extension stroke of the shock absorber, and the passage is dedicated to return the hydraulic oil from the oil reservoir to the oil chamber around the seat pipe. A shock absorber characterized by being used as a passage.
JP26818485A 1985-11-28 1985-11-28 Shock absorber Expired - Fee Related JPH0610491B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26818485A JPH0610491B2 (en) 1985-11-28 1985-11-28 Shock absorber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26818485A JPH0610491B2 (en) 1985-11-28 1985-11-28 Shock absorber

Publications (2)

Publication Number Publication Date
JPS62127535A JPS62127535A (en) 1987-06-09
JPH0610491B2 true JPH0610491B2 (en) 1994-02-09

Family

ID=17455085

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26818485A Expired - Fee Related JPH0610491B2 (en) 1985-11-28 1985-11-28 Shock absorber

Country Status (1)

Country Link
JP (1) JPH0610491B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4703981B2 (en) * 2004-06-30 2011-06-15 カヤバ工業株式会社 Front fork

Also Published As

Publication number Publication date
JPS62127535A (en) 1987-06-09

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