JP2000352404A - Fluid pressure cylinder - Google Patents
Fluid pressure cylinderInfo
- Publication number
- JP2000352404A JP2000352404A JP11164635A JP16463599A JP2000352404A JP 2000352404 A JP2000352404 A JP 2000352404A JP 11164635 A JP11164635 A JP 11164635A JP 16463599 A JP16463599 A JP 16463599A JP 2000352404 A JP2000352404 A JP 2000352404A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- piston rod
- cylinder
- seat
- hole
- 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
- Actuator (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えばフォークリ
フトのリフトシリンダ等として用いられるクッション機
能を備えた流体圧シリンダの改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a hydraulic cylinder having a cushion function, which is used as, for example, a lift cylinder of a forklift.
【０００２】[0002]
【従来の技術】従来、この種の流体圧シリンダとして
は、例えば特開平９−２８０２８９号に記載されたもの
が知られている。当該流体圧シリンダは、シリンダチュ
ーブの一端を塞ぐボトムと、シリンダチューブ内を軸方
向に移動可能なピストンと、ボトムに形成した給排ポー
トと、内部が上記給排ポートと連通し、ボトムと一体に
形成した筒部と、上記ピストンに設けた筒孔と、この筒
孔の内周下方に設けた段部と、段部を介して形成した大
径部と、段部に形成し筒孔の軸に垂直なシート面と、大
径部の側面に設置するストッパと、このストッパとシー
ト面との間に装着する環状部材と、この環状部材の外周
と筒孔の内周間に形成された自由流れ流路とを備え、上
記環状部材は、内径が筒部の外形より僅かに大きく、筒
部との間に間隙を有し、軸方向に移動可能であるととも
に、ピストンの上昇時には、環状部材がシート面から離
れ、自由流れ流路が開き、ピストンが下降して環状部材
が筒部に嵌合すると、ピストンとシリンダチューブとボ
トムと環状部材とに囲まれた圧力室内の圧力上昇によっ
て環状部材がシート面に当接して、自由流れ流路を閉
じ、上記圧力室の油が環状部材と筒部との間の間隙を介
して流出するものである。2. Description of the Related Art Conventionally, as this type of fluid pressure cylinder, for example, one described in Japanese Patent Application Laid-Open No. 9-280289 is known. The fluid pressure cylinder has a bottom that closes one end of the cylinder tube, a piston that can move in the cylinder tube in the axial direction, a supply / discharge port formed in the bottom, and an inside that communicates with the supply / discharge port and is integral with the bottom. And a cylindrical hole provided in the piston, a step provided below the inner circumference of the cylindrical hole, a large diameter portion formed through the step, and a cylindrical hole formed in the step. A sheet surface perpendicular to the axis, a stopper installed on the side surface of the large diameter portion, an annular member mounted between the stopper and the sheet surface, and formed between the outer periphery of the annular member and the inner periphery of the cylindrical hole. A free flow channel, the annular member has an inner diameter slightly larger than the outer shape of the cylindrical portion, has a gap between the cylindrical portion, is movable in the axial direction, and when the piston is raised, the annular member is annular. The member moves away from the seat surface, the free flow path opens, and the piston When the annular member is lowered and fitted into the cylindrical portion, the annular member abuts on the sheet surface due to the pressure rise in the pressure chamber surrounded by the piston, the cylinder tube, the bottom and the annular member, closing the free flow passage, The oil in the pressure chamber flows out through a gap between the annular member and the cylindrical portion.
【０００３】[0003]
【発明が解決しようとする課題】ところが、この様なも
のは、ピストンの筒孔に対応する筒部をボトムに突設し
ていると共に、ピストンロッドの凹部に対応する凸部を
ピストンに突設しているので、ボトム及びピストンの材
料歩留まりが非常に悪く、これらの構造が複雑化する難
点があった。本発明は、叙上の問題点に鑑み、これを解
消する為に創案されたもので、その課題とする処は、ボ
トム及びピストンの材料歩留まりを向上させて構造の簡
素化を図る様にした流体圧シリンダを提供するにある。However, in such a case, a cylindrical portion corresponding to the cylindrical hole of the piston is projected from the bottom, and a convex portion corresponding to the concave portion of the piston rod is projected from the piston. Therefore, the yield of materials for the bottom and the piston is very poor, and there has been a problem that these structures are complicated. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in order to solve the problem. The object of the present invention is to improve the material yield of the bottom and the piston to simplify the structure. It is to provide a hydraulic cylinder.
【０００４】[0004]
【課題を解決するための手段】本発明の流体圧シリンダ
は、基本的には、シリンダチューブと、シリンダチュー
ブの一端を塞ぐボトムと、シリンダチューブに摺動可能
に設けられてボトム室とロッド室とに区分するピストン
と、ピストンを貫通して連結されたピストンロッドと、
ボトムに形成されてボトム室に連通する給排ポートと、
給排ポートのボトム室側に形成されたシートと、ピスト
ンロッドに形成されてボトム室に連通する筒孔と、筒孔
に移動可能に設けられてシートに当座し得る弁子と、か
ら構成した事に特徴が存する。The fluid pressure cylinder of the present invention is basically provided with a cylinder tube, a bottom for closing one end of the cylinder tube, and a bottom chamber and a rod chamber slidably provided in the cylinder tube. And a piston rod that is connected through the piston,
A supply / discharge port formed at the bottom and communicating with the bottom chamber;
A seat formed on the bottom chamber side of the supply / discharge port, a cylindrical hole formed in the piston rod and communicating with the bottom chamber, and a valve element movably provided in the cylindrical hole and capable of abutting on the seat. There is a characteristic in the thing.
【０００５】ピストンにピストンロッドを貫通して設け
ると共に、ピストンロッドに筒孔を形成してここに弁子
を移動可能に設けたので、ボトム及びピストンの体積が
減少される。[0005] Since the piston rod is provided through the piston rod and a cylindrical hole is formed in the piston rod so that the valve element is movably provided therein, the volume of the bottom and the piston is reduced.
【０００６】[0006]
【発明の実施の形態】以下、本発明の実施の形態を、図
面に基づいて説明する。図１は、本発明の流体圧シリン
ダの要部を示す縦断面図。図２は、ピストン及びピスト
ンロッドの上昇過程を示す図１と同様図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a main part of a fluid pressure cylinder according to the present invention. FIG. 2 is a view similar to FIG. 1 showing a process of raising a piston and a piston rod.
【０００７】流体圧シリンダ１は、シリンダチューブ
２、ボトム３、ピストン４、ピストンロッド５、給排ポ
ート６、シート７、筒孔８、弁子９とからその主要部が
構成されて居り、この例では、フォークリフトのリフト
シリンダに適用している。The main part of the fluid pressure cylinder 1 is composed of a cylinder tube 2, a bottom 3, a piston 4, a piston rod 5, a supply / discharge port 6, a seat 7, a cylindrical hole 8, and a valve 9. In the example, the present invention is applied to a lift cylinder of a forklift.
【０００８】シリンダチューブ２は、流体圧シリンダ１
の基本部分を為すもので、この例では、上下方向に長尺
で円筒状を呈している。[0008] The cylinder tube 2 is a fluid pressure cylinder 1
In this example, it is elongated in the vertical direction and has a cylindrical shape.
【０００９】ボトム３は、シリンダチューブ２の一端を
塞ぐもので、この例では、略円柱状を呈し、上面がフラ
ットでシリンダチューブ２との嵌め合せ部が形成されて
居らず、シリンダチューブ２の底部を閉塞すべくシリン
ダチューブ２の下端が単に突き合わされて溶接箇所１０
が溶接されている。The bottom 3 closes one end of the cylinder tube 2. In this example, the bottom 3 has a substantially cylindrical shape, has a flat top surface, and does not have a fitting portion with the cylinder tube 2. The lower end of the cylinder tube 2 is simply abutted to close the bottom, and
Are welded.
【００１０】ピストン４は、シリンダチューブ２に摺動
可能に設けられてボトム室１１とロッド室１２とに区分
するもので、この例では、シリンダチューブ２に摺動可
能に嵌挿され、中心には貫孔１３が穿設されて円環状を
呈し、外周にはシリンダチューブ２との間でシールを司
るシール材１４が設けられている。The piston 4 is slidably provided in the cylinder tube 2 and is divided into a bottom chamber 11 and a rod chamber 12. In this example, the piston 4 is slidably fitted in the cylinder tube 2 and is centered. Is provided with a through-hole 13 and has an annular shape, and a seal member 14 for providing a seal between the cylinder tube 2 and the cylinder tube 2 is provided on the outer periphery.
【００１１】ピストンロッド５は、ピストン４を貫通し
て連結されたもので、この例では、上下方向に長尺でボ
トム側（下側）にはピストン４の貫孔１３に嵌入される
小径部１５を備えている。而して、ピストン４とピスト
ンロッド５の間には、シールを司るシール材１６が介設
されていると共に、抜け止め用のストッパ１７が設けら
れている。ピストンロッド５の底端（下端）は、ボトム
３の上面に当合し得ると共に、ピストンロッド５の底部
（下部）には、ピストンロッド５の底端がボトム３の上
面に当合した際でも給排ポート６とボトム室１１とを連
通させるスリット１８が形設されている。The piston rod 5 is connected through the piston 4. In this example, the piston rod 5 is elongated in the vertical direction and has a small-diameter portion fitted into the through hole 13 of the piston 4 on the bottom side (lower side). 15 are provided. Thus, between the piston 4 and the piston rod 5, a seal member 16 for controlling the seal is interposed, and a stopper 17 for retaining is provided. The bottom end (lower end) of the piston rod 5 can abut on the upper surface of the bottom 3, and the bottom (lower) of the piston rod 5 can be placed even when the bottom end of the piston rod 5 abuts on the upper surface of the bottom 3. A slit 18 that connects the supply / discharge port 6 and the bottom chamber 11 is formed.
【００１２】給排ポート６は、ボトム３に形成されてボ
トム室１１に連通するもので、この例では、ボトム３の
側面（左面）から上面に亘って略鉤状に穿設されてい
る。The supply / discharge port 6 is formed in the bottom 3 and communicates with the bottom chamber 11. In this example, the supply / discharge port 6 is formed in a substantially hook shape from the side surface (left surface) to the upper surface of the bottom 3.
【００１３】シート７は、給排ポート６のボトム室１１
側に形成されたもので、この例では、給排ポート６のボ
トム３の上面に臨む箇所をテーパ状に削除して形成され
ている。The seat 7 is provided in the bottom chamber 11 of the supply / discharge port 6.
In this example, the portion facing the upper surface of the bottom 3 of the supply / discharge port 6 is formed in a tapered shape.
【００１４】筒孔８は、ピストンロッド５に形成されて
ボトム室１１に連通するもので、この例では、ピストン
ロッド５の小径部１５に下端が開放すべく穿設されてい
る。The cylindrical hole 8 is formed in the piston rod 5 and communicates with the bottom chamber 11. In this example, the cylindrical hole 8 is formed in the small diameter portion 15 of the piston rod 5 so that the lower end is opened.
【００１５】弁子９は、筒孔８に移動可能に設けられて
シート７に当座し得るもので、この例では、筒孔８に移
動可能に嵌挿されて略栓状を呈し、上側に形成された鍔
部１９と、下側に形成されてシート７に当離座されるテ
ーパ状の座部２０と、上下方向（軸線方向）に貫通され
た縦孔２１と、これに直交して左右方向（軸線直角方
向）に貫通されて座部２０がシート７に当座した際には
スリット１８を介してボトム室１１に連通される横孔２
２とを備えて居り、下側より上側の受圧面積が大きくさ
れている。而して、弁子９は、ピストンロッド５の筒孔
８側に設けられたストッパ２３に依りその鍔部１９が当
合されてピストンロッド５からの抜け出しが阻止されて
いる。The valve 9 is movably provided in the cylindrical hole 8 and can abut on the seat 7. In this example, the valve 9 is movably fitted into the cylindrical hole 8 and has a substantially plug-like shape. The formed flange portion 19, a tapered seat portion 20 formed on the lower side and abutted on the seat 7, a vertical hole 21 penetrated in the up-down direction (axial direction), and When the seat portion 20 is seated on the seat 7 through the left and right direction (perpendicular to the axis), the lateral hole 2 communicates with the bottom chamber 11 through the slit 18.
2, and the pressure receiving area on the upper side is larger than that on the lower side. Thus, the valve element 9 is prevented from falling out of the piston rod 5 by the engagement of the flange 19 by the stopper 23 provided on the cylinder hole 8 side of the piston rod 5.
【００１６】次に、この様な構成に基づいてその作用を
述解する。図１は、ピストン４及びピストンロッド５が
最下降されて流体圧シリンダ１が最収縮された状態であ
り、ピストンロッド５がボトム３に当合されていると共
に、弁子９の座部２０がシート７に当座されている。Next, the operation will be described based on such a configuration. FIG. 1 shows a state in which the piston 4 and the piston rod 5 are lowered most and the hydraulic cylinder 1 is contracted most, and the piston rod 5 is brought into contact with the bottom 3 and the seat 20 of the valve 9 is It is seated on the seat 7.
【００１７】この様な状態に於て、圧力流体が給排ポー
ト６から供給されると、これが弁子９の縦孔２１→横孔
２２→ピストンロッド５のスリット１８を経てボトム室
１１に達するので、ピストン４が上昇される。この時、
給排ポート６からの圧力流体が弁子９の縦孔２１を経て
筒孔８内に於ける弁子９の上側に達すると共に、弁子９
の上側が下側より受圧面積が大きく、然も弁子９の自重
が働くので、弁子９の座部２０がシート７に当座された
ままピストン４が上昇される。そして、弁子９は、図２
に示す如く、鍔部１９がストッパ２３に当合されてピス
トンロッド５の下方へ突出した状態に保たれたままピス
トン４と一緒に上昇される。その後、弁子９の座部２０
がシート７から離座されるので、これらの間に形成され
た流路から圧力流体がボトム室１１に供給される事に依
りピストン４が上昇される。In such a state, when the pressure fluid is supplied from the supply / discharge port 6, the pressure fluid reaches the bottom chamber 11 via the vertical hole 21 → the horizontal hole 22 → the slit 18 of the piston rod 5. Therefore, the piston 4 is raised. At this time,
The pressure fluid from the supply / discharge port 6 reaches the upper side of the valve 9 in the cylindrical hole 8 via the vertical hole 21 of the valve 9 and
Since the pressure receiving area is larger on the upper side than on the lower side and the weight of the valve 9 works, the piston 4 is raised while the seat portion 20 of the valve 9 is seated on the seat 7. The valve 9 is shown in FIG.
As shown in (2), the flange 19 is abutted against the stopper 23 and rises together with the piston 4 while keeping the state protruding below the piston rod 5. Then, the seat 20 of the valve 9
Is separated from the seat 7, and the piston 4 is raised by supplying the pressurized fluid to the bottom chamber 11 from the flow path formed therebetween.
【００１８】ピストン４が上昇された後に、ボトム室１
１の圧力流体が給排ポート６から排出されると、ピスト
ン４が下降される。そして、ピストン４がボトム３に近
づくと、図２に示す如く、弁子９の座部２０がシート７
に当座してこれらの間の流路が遮断されるので、ボトム
室１１の圧力流体が弁子９の横孔２２→縦孔２１→給排
ポート６を経て排出され、ピストン４が下降されながら
弁子９が筒孔８内に収納されて行き、図１に示す如く、
ピストン４が最下降状態になる。この時、ボトム室１１
の圧力流体が弁子９の横孔２２と縦孔２１とに依り所謂
絞られるので、クッション機能が発揮される。After the piston 4 is raised, the bottom chamber 1
When one pressure fluid is discharged from the supply / discharge port 6, the piston 4 is lowered. When the piston 4 approaches the bottom 3, as shown in FIG.
And the flow path therebetween is cut off, so that the pressure fluid in the bottom chamber 11 is discharged through the horizontal hole 22 → the vertical hole 21 → the supply / discharge port 6 of the valve 9 and the piston 4 is lowered. The valve 9 is housed in the cylindrical hole 8, and as shown in FIG.
The piston 4 comes to the lowest position. At this time, the bottom chamber 11
Is narrowed by the horizontal hole 22 and the vertical hole 21 of the valve 9, so that a cushion function is exhibited.
【００１９】ピストン４にピストンロッド５を貫通して
設けると共に、ピストンロッド５に筒孔８を形成してこ
こに弁子９を移動可能に設けたので、ボトム３及びピス
トン４の体積が減少される。この為、ボトム３及びピス
トン４の材料歩留まりが向上されてコストの低減と構造
の簡素化を図る事ができる。Since the piston 4 is provided with the piston rod 5 penetrating therethrough, and the cylindrical hole 8 is formed in the piston rod 5 and the valve 9 is movably provided therein, the volume of the bottom 3 and the piston 4 is reduced. You. For this reason, the material yield of the bottom 3 and the piston 4 is improved, so that the cost can be reduced and the structure can be simplified.
【００２０】尚、弁子９は、先の例では、自重で下方に
移動するする様にしたが、これに限らず、例えばピスト
ンロッド５と弁子９との間に弁子９を下方に付勢する圧
縮スプリング等の弾性体を介設しても良い。この様にす
れば、弁子９が確実に下方に移動される。In the above example, the valve 9 moves downward by its own weight. However, the present invention is not limited to this. For example, the valve 9 moves downward between the piston rod 5 and the valve 9. An elastic body such as a compression spring may be interposed. By doing so, the valve 9 is reliably moved downward.
【００２１】[0021]
【発明の効果】以上、既述した如く、本発明に依れば、
次の様な優れた効果を奏する事ができる。 （１） シリンダチューブ、ボトム、ピストン、ピスト
ンロッド、給排ポート、シート、筒孔、弁子とで構成
し、とりわけピストンにピストンロッドを貫通して設け
ると共に、ピストンロッドに筒孔を形成してここに弁子
を移動可能に設けたので、ボトム及びピストンの材料歩
留まりを向上させて構造の簡素化を図る事ができる。As described above, according to the present invention,
The following excellent effects can be obtained. (1) It is composed of a cylinder tube, a bottom, a piston, a piston rod, a supply / discharge port, a seat, a cylinder hole, and a valve. In particular, a piston hole is provided through the piston, and a cylinder hole is formed in the piston rod. Since the valve is movably provided here, the material yield of the bottom and the piston can be improved, and the structure can be simplified.
【図１】本発明の流体圧シリンダの要部を示す縦断面
図。FIG. 1 is a longitudinal sectional view showing a main part of a fluid pressure cylinder of the present invention.
【図２】ピストン及びピストンロッドの上昇過程を示す
図１と同様図。FIG. 2 is a view similar to FIG. 1, showing a process of raising a piston and a piston rod.
１…流体圧シリンダ、２…シリンダチューブ、３…ボト
ム、４…ピストン、５…ピストンロッド、６…給排ポー
ト、７…シート、８…筒孔、９…弁子、１０…溶接箇
所、１１…ボトム室、１２…ロッド室、１３…貫孔、１
４…シール材、１５…小径部、１６…シール材、１７…
ストッパ、１８…スリット、１９…鍔部、２０…座部、
２１…縦孔、２２…横孔、２３…ストッパ。DESCRIPTION OF SYMBOLS 1 ... Fluid pressure cylinder, 2 ... Cylinder tube, 3 ... Bottom, 4 ... Piston, 5 ... Piston rod, 6 ... Supply / discharge port, 7 ... Seat, 8 ... Cylindrical hole, 9 ... Valve, 10 ... Welding point, 11 ... Bottom chamber, 12 ... Rod chamber, 13 ... Through hole, 1
4 ... Seal material, 15 ... Small diameter part, 16 ... Seal material, 17 ...
Stopper, 18 slit, 19 flange, 20 seat,
21 ... vertical hole, 22 ... horizontal hole, 23 ... stopper.
Claims (1)
の一端を塞ぐボトムと、シリンダチューブに摺動可能に
設けられてボトム室とロッド室とに区分するピストン
と、ピストンを貫通して連結されたピストンロッドと、
ボトムに形成されてボトム室に連通する給排ポートと、
給排ポートのボトム室側に形成されたシートと、ピスト
ンロッドに形成されてボトム室に連通する筒孔と、筒孔
に移動可能に設けられてシートに当座し得る弁子と、か
ら構成した事を特徴とする流体圧シリンダ。A piston rod slidably provided in the cylinder tube to divide the cylinder tube into a bottom chamber and a rod chamber, and a piston rod connected through the piston. When,
A supply / discharge port formed at the bottom and communicating with the bottom chamber;
A seat formed on the bottom chamber side of the supply / discharge port, a cylindrical hole formed in the piston rod and communicating with the bottom chamber, and a valve element movably provided in the cylindrical hole and capable of abutting on the seat. Fluid pressure cylinder characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16463599A JP3659839B2 (en) | 1999-06-11 | 1999-06-11 | Fluid pressure cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16463599A JP3659839B2 (en) | 1999-06-11 | 1999-06-11 | Fluid pressure cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000352404A true JP2000352404A (en) | 2000-12-19 |
| JP3659839B2 JP3659839B2 (en) | 2005-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16463599A Expired - Fee Related JP3659839B2 (en) | 1999-06-11 | 1999-06-11 | Fluid pressure cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3659839B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008267514A (en) * | 2007-04-20 | 2008-11-06 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Cushion device for hydraulic cylinder |
-
1999
- 1999-06-11 JP JP16463599A patent/JP3659839B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008267514A (en) * | 2007-04-20 | 2008-11-06 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Cushion device for hydraulic cylinder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3659839B2 (en) | 2005-06-15 |
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