JPH0221629Y2

JPH0221629Y2 -

Info

Publication number: JPH0221629Y2
Application number: JP13517883U
Authority: JP
Priority date: 1983-08-31
Filing date: 1983-08-31
Publication date: 1990-06-11
Also published as: JPS6045197U

Description

【考案の詳細な説明】本考案は、アンチダイブ機構を備えて成るロツ
ド型油圧緩衝器の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a rod-type hydraulic shock absorber equipped with an anti-dive mechanism.

この種ロツド型油圧緩衝器においては、伸長行
程時初期、ピストンの上昇に伴い該ピストン下方
の油室に油を補給する必要があるが、従来はアン
チダイブ機構内の長い油路を経て油を補給してい
たため、伸長行程への移行が円滑に成されず、異
音を発生することすらあつた。 In this type of rod-type hydraulic shock absorber, it is necessary to supply oil to the oil chamber below the piston as the piston rises at the beginning of the extension stroke, but conventionally oil is supplied through a long oil path in the anti-dive mechanism. Because of the replenishment, the transition to the extension stroke was not smooth, and some abnormal noises were even generated.

本考案は斯かる問題を有効に解決すべく成され
たもので、その目的とする処は、伸長行程への移
行が円滑、且つ確実に成されるロツド型油圧緩衝
器を提供するにある。 The present invention was developed to effectively solve this problem, and its purpose is to provide a rod-type hydraulic shock absorber that can smoothly and reliably transition to an extension stroke.

斯かる目的を達成すべく本考案は、ロツド型油
圧緩衝器のシートパイプ外周に鍔付オイルロツク
ピースを嵌合し、シートパイプ内室とオイルロツ
クピース鍔下側室とを連通するとともに、オイル
ロツクピースにシートパイプ外室とオイルロツク
ピース鍔下側室を連通せしめる油路を穿設し、押
行程で該油路を閉じる逆止弁を設けたことをその
特徴とする。 In order to achieve such an objective, the present invention fits a flanged oil lock piece to the outer periphery of the seat pipe of a rod-type hydraulic shock absorber, communicates the inner chamber of the seat pipe with the chamber below the flange of the oil lock piece, and The piece is characterized in that an oil passage is bored in the piece to communicate the outer chamber of the seat pipe and the lower chamber of the oil lock piece flange, and a check valve is provided to close the oil passage during the pushing stroke.

以下に本考案の好適一実施例を添付図面に基づ
いて詳述する。 A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

第１図は本考案に係るロツド型油圧緩衝器の一
部破断側面図、第２図は同油圧緩衝器下部の拡大
破断側面図である。 FIG. 1 is a partially cutaway side view of a rod-type hydraulic shock absorber according to the present invention, and FIG. 2 is an enlarged cutaway side view of the lower part of the hydraulic shock absorber.

第１図に示す油圧緩衝器１において、２は外筒
であり、該外筒２内には上方より内筒３が上下摺
動自在に挿入嵌合されている。又外筒２内底部に
は図示の如くシートパイプ４が植設されており、
該シートパイプ４が植設されており、該シートパ
イプ４の上端ピストン部４ａは前記内筒３内周に
摺接している。 In the hydraulic shock absorber 1 shown in FIG. 1, 2 is an outer cylinder, and an inner cylinder 3 is inserted and fitted into the outer cylinder 2 from above so as to be vertically slidable. In addition, a seat pipe 4 is installed at the inner bottom of the outer cylinder 2 as shown in the figure.
The seat pipe 4 is installed, and the upper end piston portion 4a of the seat pipe 4 is in sliding contact with the inner periphery of the inner cylinder 3.

一方、内筒３内上端にはロツド５が固定されて
おり、該ロツド５は前記シートパイプ４内に臨
み、これの下端にはシートパイプ４内周に上下摺
動自在に嵌合するピストン６が結着されている。 On the other hand, a rod 5 is fixed to the inner upper end of the inner cylinder 3, and the rod 5 faces the inside of the seat pipe 4, and a piston 6 is fitted to the lower end of the rod 5 so as to be vertically slidable on the inner periphery of the seat pipe 4. are tied together.

又外筒２の上端内周部には内筒３の外周に摺接
するオイルシール７が嵌装されており、更に外筒
２の上端開口部には同じく内筒３外周に摺接する
ダストシール８が被冠されている。尚図中、９は
ダストブーツ、１０はコイルスプリングである。 An oil seal 7 that slides on the outer periphery of the inner cylinder 3 is fitted on the inner periphery of the upper end of the outer cylinder 2, and a dust seal 8 that also slides on the outer periphery of the inner cylinder 3 is fitted on the upper opening of the outer cylinder 2. It is crowned. In the figure, 9 is a dust boot, and 10 is a coil spring.

ところで、シートパイプ４の下端部外周には第
２図に示す如く鍔付オイルロツクピース１１が嵌
合しており、該オイルロツクピース１１の鍔部１
１ａの下方には油室S₁が形成されている。又シー
トパイプ４の下端部内周にはナツト部材１２が嵌
装されており、該ナツト部材１２にはシートパイ
プ内室S₂と前記油室S₁とを連通する複数の油路１
２ａ…が穿設されている。更に前記オイルロツク
ピース１１にはシートパイプ外室S₃と油室S₁とを
連通する油路１１ｂ…が穿設されており、オイル
ロツクピース１１には押行程で上記油路１１ｂ…
を閉塞するチエツクバルブ１３がスプリング１４
にて弾発されて設けられている。 By the way, a flanged oil lock piece 11 is fitted to the outer periphery of the lower end of the seat pipe 4 as shown in FIG.
An oil chamber _S1 is formed below 1a. A nut member 12 is fitted on the inner periphery of the lower end of the seat pipe 4, and the nut member 12 has a plurality of oil passages ₁ communicating between the seat pipe inner chamber _S2 and the oil chamber S1.
2a... are drilled. Further, the oil lock piece 11 is provided with oil passages 11b that communicate the seat pipe outer chamber _S3 and the oil chamber _S1 , and the oil passages 11b are formed in the oil lock piece 11 during the pushing stroke.
The check valve 13 that closes the spring 14
It is set up with a bullet.

一方、外筒２の側部にはアンチダイブ機構２０
が固設されている。アンチダイブ機構２０におい
て、２１はケース部材であり、該ケース部材２１
内にはシートパイプ外室S₃と油室S₁とを相連通せ
しめる油路２２が形成され、該油路２２の中間に
はその中央に油孔２３ａを穿設して成る弁座部材
２３が摺動自在に嵌装されており、該弁座部材２
３はスプリング２４にて第２図中右方へ弾発され
ている。そして、通常は弁座部材２３と後述の弁
部材２５間には第２図に示す如く隙間ΔSが形成
されている。 On the other hand, an anti-dive mechanism 20 is provided on the side of the outer cylinder 2.
is permanently installed. In the anti-dive mechanism 20, 21 is a case member;
A valve seat member 23 is formed therein with an oil passage 22 that communicates the seat pipe outer chamber S ₃ with the oil chamber S ₁ , and an oil hole 23 a is bored in the middle of the oil passage 22 . is slidably fitted, and the valve seat member 2
3 is pushed to the right in FIG. 2 by a spring 24. A gap ΔS is normally formed between the valve seat member 23 and a valve member 25, which will be described later, as shown in FIG.

又ケース部材２１には横孔２１ａが形成されて
おり、該横孔２１ａ内には弁部材２５、プランジ
ヤ２６が夫々摺動自在に嵌装されている。尚弁部
材２５と前記弁座部材２３間にはスプリング２７
が介設されている。 A horizontal hole 21a is formed in the case member 21, and a valve member 25 and a plunger 26 are slidably fitted into the horizontal hole 21a. A spring 27 is provided between the valve member 25 and the valve seat member 23.
is interposed.

上記プランジヤ２６の右端鍔部２６ａはケース
部材２１内に形成される圧力室S₄内に臨んでお
り、該圧力室S₄はホース２８を介して制動装置、
例えばマスターシリンダ（図示せず）に連通して
いる。 The right end flange 26a of the plunger 26 faces the inside of the pressure chamber _S4 formed in the case member 21, and the pressure chamber _S4 is connected to the braking device via the hose 28.
For example, it communicates with a master cylinder (not shown).

而して押行程において、内筒３、ロツド５及び
ピストン６が外筒２及びシートパイプ４に対して
下動すれば、ロツド５の侵入体積分に相当する量
の油がシートパイプ内室S₂からナツト部材１２に
設けた油路１２ａ…、アンチダイブ機構２０の油
路２２、隙間ΔS及び弁座部材２３の油孔２３ａ
を経てシートパイプ外室S₃内に流入する。 In the pushing stroke, when the inner cylinder 3, rod 5, and piston 6 move downward relative to the outer cylinder 2 and the seat pipe 4, an amount of oil corresponding to the intrusion volume of the rod 5 flows into the seat pipe inner chamber S. ₂ to the oil passage 12a provided in the nut member 12..., the oil passage 22 of the anti-dive mechanism 20, the gap ΔS, and the oil hole 23a of the valve seat member 23.
It flows into the sheet pipe outer chamber _S3 through the sheet pipe.

ところで、斯かる油圧緩衝器１をフロントフオ
ークとして適用する二輪車等の車両において、走
行中制動をかけると、慣性により車体重心は前方
へ移動し、緩衝器１が圧縮されて車体前部が下方
へ沈み込もうとする。 By the way, in a vehicle such as a two-wheeled vehicle to which such a hydraulic shock absorber 1 is applied as a front fork, when braking is applied while driving, the center of gravity of the vehicle moves forward due to inertia, the shock absorber 1 is compressed, and the front of the vehicle body moves downward. Trying to sink in.

ところが、制動時マスターシリンダに発生する
圧油はホース２８を介してアンチダイブ機構２０
の圧力室S₄に供給され、ここでプランジヤ２６の
右端面に作用して該プランジヤ２６を第２図中左
動せしめる。このプランジヤ２６は弁部材２５を
同方向へ移動せしめ、該弁部材２５をして弁座部
材２３の油孔２３ａを閉塞せしめる。この結果、
押行程時のシートパイプ内室S₂からシートパイプ
外室S₃への油の流動は遮断され、内筒３、ロツド
５及びピストン６の下動は阻止され、ここにアン
チダイブ機構が発揮され、車体前部の沈み込みは
有効に阻止され、車両の換縦安定性が害されるこ
とがない。 However, the pressure oil generated in the master cylinder during braking is transferred to the anti-dive mechanism 20 via the hose 28.
The pressure is supplied to the pressure chamber _S4 , where it acts on the right end surface of the plunger 26 to move the plunger 26 to the left in FIG. This plunger 26 moves the valve member 25 in the same direction, causing the valve member 25 to close the oil hole 23a of the valve seat member 23. As a result,
During the pushing stroke, the flow of oil from the seat pipe inner chamber _S2 to the seat pipe outer chamber _S3 is blocked, and the downward movement of the inner cylinder 3, rod 5, and piston 6 is prevented, and the anti-dive mechanism is activated. The front part of the vehicle body is effectively prevented from sinking, and the longitudinal stability of the vehicle is not impaired.

次に緩衝器１が伸長行程に移行する場合、シー
トパイプ内室S₂内にはロツド５の退出体積分の量
の油が補給されねばならない。従来はシートパイ
プ内室S₂への油の補給は、シートパイプ外室S₃か
ら油路２２，１２ａ…を介して成されていたが、
油路２２の長さが長く、従つて油の補給はロツド
５及びピストン６の上動に迅速に追従して成され
ず、前述の如き不都合が生じていた。 Next, when the shock absorber 1 moves to an extension stroke, the interior of the seat pipe _S2 must be replenished with oil in an amount equivalent to the volume of the rod 5 withdrawn. Conventionally, oil was supplied to the seat pipe inner chamber S ₂ from the seat pipe outer chamber S ₃ via oil passages 22, 12a, etc.
Since the length of the oil passage 22 is long, oil replenishment cannot quickly follow the upward movements of the rod 5 and piston 6, resulting in the above-mentioned inconvenience.

ところが、本考案によれば、シートパイプ外室
S₃の油はオイルロツクピース１１に設けた油路１
１ｂ…、逆止弁１３、油路１２ａ…の最短経路を
経てシートパイプ内室S₂に迅速、且つ確実に補給
されるため、伸長行程への移行が円滑、且つ確実
に成され、又異音が発生することもない。 However, according to the present invention, the seat pipe outer chamber
The oil in _S3 is in oil passage 1 provided in oil lock piece 11.
1b..., the check valve 13, and the oil passage 12a..., the sheet pipe interior chamber _S2 is quickly and reliably replenished through the shortest route, so that the transition to the extension stroke is smooth and reliable, and no abnormality occurs. No sound is generated.

以上の説明で明らかな如く本考案によれば、伸
長行程移行時の油の補給を最短油路を介して成す
ようにしたため、伸長行程への移行が円滑、且つ
確実に成される。 As is clear from the above description, according to the present invention, oil is supplied via the shortest oil path at the time of transition to the extension stroke, so that the transition to the extension stroke is achieved smoothly and reliably.

[Brief explanation of the drawing]

図面は本考案の一実施例を示すものであり、第
１図は本考案に係るロツド型油圧緩衝器の一部破
断側面図、第２図は同緩衝器下部の拡大破断側面
図である。尚図面中、１はロツド型油圧緩衝器、２は外
筒、３は内筒、４はシートパイプ、５はロツド、
１１は鍔付オイルロツクピース、１１ｂは油路、
１３は逆止弁、２０はアンチダイブ機構である。 The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway side view of a rod-type hydraulic shock absorber according to the present invention, and FIG. 2 is an enlarged cutaway side view of the lower part of the shock absorber. In the drawing, 1 is a rod-type hydraulic shock absorber, 2 is an outer cylinder, 3 is an inner cylinder, 4 is a seat pipe, 5 is a rod,
11 is a flanged oil lock piece, 11b is an oil path,
13 is a check valve, and 20 is an anti-dive mechanism.

Claims

[Scope of utility model registration request]

The inner and outer cylinders are slidably fitted together, and the upper end piston part of the seat pipe implanted in the inner bottom of the outer cylinder is brought into sliding contact with the inner periphery of the inner cylinder, and the rod implanted in the upper end of the inner cylinder is inserted into the seat. A rod-type hydraulic shock absorber that is inserted into a pipe, has a piston attached to its lower end that slides on the inner periphery of the seat pipe, and has an anti-dive mechanism attached to the side of the outer cylinder that blocks the oil passage when the vehicle is braking. , a flanged oil lock piece is fitted to the outer periphery of the seat pipe, and the inner chamber of the seat pipe and the chamber below the flange of the oil lock piece communicate with each other, and the outer chamber of the seat pipe and the chamber below the flange of the oil lock piece are communicated with the oil lock piece. 1. A rod-type hydraulic shock absorber, characterized in that an oil passage is drilled through which the rod is pushed, and a check valve is provided to close the oil passage during a pushing stroke.