JP2010175042A - Cylinder device - Google Patents

Cylinder device Download PDF

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Publication number
JP2010175042A
JP2010175042A JP2009020761A JP2009020761A JP2010175042A JP 2010175042 A JP2010175042 A JP 2010175042A JP 2009020761 A JP2009020761 A JP 2009020761A JP 2009020761 A JP2009020761 A JP 2009020761A JP 2010175042 A JP2010175042 A JP 2010175042A
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Prior art keywords
cylinder
outer cylinder
fixing member
rod guide
piston
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JP2009020761A
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JP5403220B2 (en
Inventor
Kazunori Minoguchi
一範 美濃口
Tetsuo Yoshida
哲生 吉田
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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Priority to JP2009020761A priority Critical patent/JP5403220B2/en
Priority to CN201010103916.1A priority patent/CN101793273B/en
Priority to US12/694,619 priority patent/US8985008B2/en
Priority to DE201010006168 priority patent/DE102010006168A1/en
Publication of JP2010175042A publication Critical patent/JP2010175042A/en
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Publication of JP5403220B2 publication Critical patent/JP5403220B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder device, reduced in complicated component processing or complicated assembling operation. <P>SOLUTION: The hydraulic cylinder 1a includes an outer cylinder 2 having an opening 4 at one end, a piston 14 slidably inserted into an inner cylinder 3 disposed within the outer cylinder 2 to divide the inside of the inner cylinder 3 to two chambers, a sealing member 6 inserted to the opening 4 of the outer cylinder 2 to seal the inside of the outer cylinder 2, an annular fixing member 10a inserted to the opening 4 of the outer cylinder 2 and disposed on the open side of the outer cylinder 2 relative to the sealing member 6, and a piston rod 15 inserted into the outer cylinder 2 through the sealing member 6 and the fixing member 10a and integrally moving with the piston 14. Since the fixing member 10a is caulked to the outer cylinder 2, mixing of fine chips by complicated component processing or the like into the outer cylinder 2 can be reduced to simplify the assembling operation. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、シリンダ装置に関するものである。   The present invention relates to a cylinder device.

自動車には、走行状況に応じて、前後スタビライザの作動を最適に制御するサスペンション装置が採用されるものがあり、該サスぺンション装置には、例えば特許文献１に開示された油圧シリンダが採用される。   Some automobiles employ a suspension device that optimally controls the operation of the front and rear stabilizers according to the driving situation. For example, a hydraulic cylinder disclosed in Patent Document 1 is adopted as the suspension device. The

特開２００５−１３３９０２号公報JP 2005-133902 A

この種の油圧シリンダは、ロッドガイド及び密封部材が挿通されたピストンロッドアッセンブリをシリンダと共に外筒に挿入した後、キャップが外筒に螺着されて構成されるが、生産性、信頼性をさらに高めることが望まれている。   This type of hydraulic cylinder is configured by inserting a piston rod assembly through which a rod guide and a sealing member are inserted into the outer cylinder together with the cylinder, and then screwing the cap onto the outer cylinder. This further increases productivity and reliability. It is desired to increase.

本発明は、生産性を向上したシリンダ装置を提供することを目的とする。   An object of this invention is to provide the cylinder apparatus which improved productivity.

上記課題を解決するための手段として、本発明のうち請求項１に記載した発明は、少なくとも一端に開口部を有するシリンダと、該シリンダ内に摺動自在に挿入されシリンダ内を２室に画成するピストンと、前記シリンダの開口部に挿入されシリンダ内を密封する環状の密封部材と、前記シリンダの開口部に挿入され、前記密封部材に対して前記シリンダの開放側に配置され外周に凹部が形成された環状の固定部材と、前記シリンダ内に前記密封部材及び前記固定部材を介して挿入され、前記ピストンと一体的に移動するピストンロッドとを備え、前記シリンダの周壁を内方に突設させた突起部を前記固定部材の凹部に係合させたことを特徴とするものである。   As means for solving the above-mentioned problems, the invention described in claim 1 of the present invention includes a cylinder having an opening at at least one end, and a slidably inserted into the cylinder so that the inside of the cylinder is divided into two chambers. A piston that is formed, an annular sealing member that is inserted into the opening of the cylinder and seals the inside of the cylinder, and is inserted into the opening of the cylinder and is disposed on the open side of the cylinder with respect to the sealing member and is recessed on the outer periphery. And a piston rod that is inserted into the cylinder via the sealing member and the fixing member and moves integrally with the piston, and protrudes inwardly from the peripheral wall of the cylinder. The protruding portion provided is engaged with the concave portion of the fixing member.

本発明のシリンダ装置により、生産性を向上することができる。   Productivity can be improved by the cylinder device of the present invention.

図１は、本発明の第１の実施形態に係る油圧シリンダの部分断面図である。FIG. 1 is a partial cross-sectional view of a hydraulic cylinder according to a first embodiment of the present invention. 図２は、本発明の第１の実施形態に係る油圧シリンダの要部拡大図である。FIG. 2 is an enlarged view of a main part of the hydraulic cylinder according to the first embodiment of the present invention. 図３は、本発明の第１の実施形態に係る油圧シリンダに採用したロッドガイドの拡大図である。FIG. 3 is an enlarged view of the rod guide employed in the hydraulic cylinder according to the first embodiment of the present invention. 図４は、本発明の第１の実施形態に係る油圧シリンダに採用したオイルシールの拡大図である。FIG. 4 is an enlarged view of an oil seal employed in the hydraulic cylinder according to the first embodiment of the present invention. 図５は、本発明の第１の実施形態に係る油圧シリンダに採用したダストシールの拡大図である。FIG. 5 is an enlarged view of the dust seal employed in the hydraulic cylinder according to the first embodiment of the present invention. 図６は、本発明の第１の実施形態に係る油圧シリンダに採用した固定部材の拡大図である。FIG. 6 is an enlarged view of a fixing member employed in the hydraulic cylinder according to the first embodiment of the present invention. 図７は、本発明の第２の実施形態に係る油圧シリンダの要部拡大図である。FIG. 7 is an enlarged view of a main part of a hydraulic cylinder according to the second embodiment of the present invention. 図８は、本発明の第３の実施形態に係る油圧シリンダの要部拡大図である。FIG. 8 is an enlarged view of a main part of a hydraulic cylinder according to the third embodiment of the present invention.

以下、本発明を実施するための形態を図１〜図８に基いて詳細に説明する。
本発明の実施の形態に係るシリンダ装置は、作動液として作動油が採用される油圧シリンダ１ａ〜１ｃとして提供される。なお、以下の説明では、図視の通り、外筒２の開放側を下側、外筒２の底部側を上側として、適宜説明する。 Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
The cylinder device according to the embodiment of the present invention is provided as hydraulic cylinders 1a to 1c in which hydraulic oil is employed as hydraulic fluid. In the following description, as shown in the figure, the open side of the outer cylinder 2 is set as the lower side, and the bottom side of the outer cylinder 2 is set as the upper side as appropriate.

まず、本発明の第１の実施形態に係る油圧シリンダ１ａを図１〜図６に基いて説明する。
第１の実施形態に係る油圧シリンダ１ａは、図１及び図２に示すように、円筒状の内筒３の外周に、下端に開口部４を有した有底円筒状の外筒２を備えた二重筒構造で構成される。外筒２と内筒３との間に環状の連通路９が形成される。外筒２及び内筒３がシリンダに相当する。内筒３の下端で外筒２の下端開口部４には、外筒２の内周面に当接するように、ロッドガイド５ａ、密封部材６及び固定部材１０ａが上方から、すなわち、外筒２の底部側から順に配置される。これらロッドガイド５ａ、密封部材６及び固定部材１０ａは互いに当接するように配設される。なお、外筒２の上端には取付アイ１３が外筒２と一体的に備えられる。 First, a hydraulic cylinder 1a according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the hydraulic cylinder 1 a according to the first embodiment includes a bottomed cylindrical outer cylinder 2 having an opening 4 at the lower end on the outer periphery of a cylindrical inner cylinder 3. It has a double cylinder structure. An annular communication path 9 is formed between the outer cylinder 2 and the inner cylinder 3. The outer cylinder 2 and the inner cylinder 3 correspond to cylinders. In the lower end opening 4 of the outer cylinder 2 at the lower end of the inner cylinder 3, the rod guide 5 a, the sealing member 6 and the fixing member 10 a are arranged from above, that is, the outer cylinder 2 so as to contact the inner peripheral surface of the outer cylinder 2. Are arranged in order from the bottom side. The rod guide 5a, the sealing member 6 and the fixing member 10a are disposed so as to contact each other. A mounting eye 13 is provided integrally with the outer cylinder 2 at the upper end of the outer cylinder 2.

内筒３内には、図１に示すように、ピストン１４が摺動自在に挿入されており、該ピストン１４によって内筒３内が第１シリンダ室１６及び第２シリンダ室１７の２室に画成される。ピストン１４には、ピストンロッド１５の上端部がナット１８によって連結される。なお、ピストン１４の下部外周面に設けた環状溝部には締付リング３５が備えられる。一方、ピストンロッド１５の下端側は、ロッドガイド５ａ、密封部材６及び固定部材１０ａに挿通されて外筒２の外部に突出される。ピストンロッド１５の下端部は、カバー取付台２０を介して断面半円状の取付具２１に連結される。また、外筒２から突出したピストンロッド１５を覆うように伸縮カバー２２が配置され、該伸縮カバー２２は外筒２の下端の外周面とカバー取付台２０の外周とに連結される。なお、ピストンロッド１５の下端部にはカバー取付台２０に当接したバンプラバー２３が挿通される。   As shown in FIG. 1, a piston 14 is slidably inserted into the inner cylinder 3, and the inner cylinder 3 is divided into two chambers, a first cylinder chamber 16 and a second cylinder chamber 17, by the piston 14. Defined. An upper end portion of the piston rod 15 is connected to the piston 14 by a nut 18. The annular groove provided on the lower outer peripheral surface of the piston 14 is provided with a tightening ring 35. On the other hand, the lower end side of the piston rod 15 is inserted through the rod guide 5 a, the sealing member 6, and the fixing member 10 a and protrudes to the outside of the outer cylinder 2. A lower end portion of the piston rod 15 is connected to a fixture 21 having a semicircular cross section through a cover mount 20. An extendable cover 22 is disposed so as to cover the piston rod 15 protruding from the outer cylinder 2, and the extendable cover 22 is connected to the outer peripheral surface of the lower end of the outer cylinder 2 and the outer periphery of the cover mounting base 20. A bump rubber 23 that is in contact with the cover mounting base 20 is inserted into the lower end portion of the piston rod 15.

外筒２の上端部には、図１に示すように、第１シリンダ室１６と直接連通し、その直径が上方に向かうにつれて徐々に小径となるように上端が略半球状となった室２４が形成される。該室２４の側壁には、室２４内と連通する第１給排口２５が形成されると共に、該第１給排口２５よりも上側で室２４の最上部に連通する第１ブリード孔２６が形成される。なお、第１ブリード孔２６には、第１ブリードプラグ２７が取り付けられる。また、外筒２の上部の側壁には、連通路９に連通する第２給排口２８が形成されると共に、該第２給排口２８よりも上側で連通路９の最上部に連通する第２ブリード孔２９が形成される。なお、第２ブリード孔２９には、第２ブリードプラグ３０が取り付けられる。   As shown in FIG. 1, the outer cylinder 2 is in direct communication with the first cylinder chamber 16, and a chamber 24 whose upper end is substantially hemispherical so that the diameter gradually decreases toward the top. Is formed. A first supply / exhaust port 25 communicating with the interior of the chamber 24 is formed on the side wall of the chamber 24, and a first bleed hole 26 communicating with the uppermost portion of the chamber 24 above the first supply / exhaust port 25. Is formed. A first bleed plug 27 is attached to the first bleed hole 26. Further, a second supply / exhaust port 28 communicating with the communication passage 9 is formed in the upper side wall of the outer cylinder 2 and communicates with the uppermost portion of the communication passage 9 above the second supply / exhaust port 28. A second bleed hole 29 is formed. A second bleed plug 30 is attached to the second bleed hole 29.

ロッドガイド５ａは、図２及び図３に示すように、ピストンロッド１５が挿通される円筒状に形成される。ロッドガイド５ａの上端外周縁には、内筒３の下端が嵌合する断面Ｌ字状の環状段部３２が形成される。該環状段部３２と内筒３の下端との間には、連通路９と第２シリンダ室１７とを連通させる通路３３が形成される。また、ロッドガイド５ａの上部内周面には、円筒体３８が嵌合される。ロッドガイド５ａの下端面略中央には、密封部材６であるオイルシール部材７の一部を収容するための凹部３４が形成される。また、ロッドガイド５ａの内周面に設けた環状溝部には拡径リング３６が備えられ、拡径リング３６の内側には支持リング３７が備えられる。さらに、ロッドガイド５ａの外周面には、拡径リング３６と軸方向で同じ位置に、カシメ固定用としての断面コ字状の環状凹部３９が形成される。
このロッドガイド５ａの下端面に、密封部材６を構成するオイルシール部材７の膜状部位４１（図４参照）が当接するように配置される。
なお、第１の実施形態では、ロッドガイド５ａの外周面にカシメ固定用として環状凹部３９を形成したが、周方向に断続させた溝部を形成してもよい。また、環状凹部３９を断面Ｕ字状または断面Ｖ字状に形成してもよい。さらに、環状凹部３９を軸方向に間隔をおいて複数形成してもよい。 As shown in FIGS. 2 and 3, the rod guide 5 a is formed in a cylindrical shape through which the piston rod 15 is inserted. An annular step 32 having an L-shaped cross-section with which the lower end of the inner cylinder 3 is fitted is formed on the outer periphery of the upper end of the rod guide 5a. A passage 33 is formed between the annular step 32 and the lower end of the inner cylinder 3 to allow the communication passage 9 and the second cylinder chamber 17 to communicate with each other. A cylindrical body 38 is fitted to the upper inner peripheral surface of the rod guide 5a. A concave portion 34 for accommodating a part of the oil seal member 7, which is the sealing member 6, is formed in the approximate center of the lower end surface of the rod guide 5 a. The annular groove provided on the inner peripheral surface of the rod guide 5 a is provided with a diameter-expanding ring 36, and a support ring 37 is provided inside the diameter-expanding ring 36. Furthermore, an annular recess 39 having a U-shaped cross-section for fixing caulking is formed on the outer peripheral surface of the rod guide 5a at the same position as the diameter expansion ring 36 in the axial direction.
It arrange | positions so that the film | membrane-like site | part 41 (refer FIG. 4) of the oil seal member 7 which comprises the sealing member 6 may contact | abut to the lower end surface of this rod guide 5a.
In the first embodiment, the annular recess 39 is formed on the outer peripheral surface of the rod guide 5a for caulking, but a groove portion intermittent in the circumferential direction may be formed. Moreover, you may form the cyclic | annular recessed part 39 in a cross-sectional U shape or a cross-sectional V shape. Furthermore, a plurality of annular recesses 39 may be formed at intervals in the axial direction.

密封部材６は、図２、図４及び図５に示すように、ピストンロッド１５が挿入されて該ピストンロッド１５の外周面を圧接するオイルシール部材７及びダストシール部材８からなり、ロッドガイド５ａの下端面にオイルシール部材７が当接されると共に、該オイルシール部材７の下端面にダストシール部材８が当接されて配置される。これらオイルシール部材７及びダストシール部材８は開口部４の内壁と接する環状の座金４０、４５とその内周に焼き付けた合成樹脂とで構成される。   As shown in FIGS. 2, 4 and 5, the sealing member 6 includes an oil seal member 7 and a dust seal member 8 into which the piston rod 15 is inserted and press-contacts the outer peripheral surface of the piston rod 15. The oil seal member 7 is in contact with the lower end surface, and the dust seal member 8 is in contact with the lower end surface of the oil seal member 7. The oil seal member 7 and the dust seal member 8 are composed of annular washers 40 and 45 in contact with the inner wall of the opening 4 and synthetic resin baked on the inner periphery thereof.

オイルシール部材７は、座金４０とシール部からなり、シール部は座金４０の外周面と外筒２の内周面との間をシールする外周シール部４２が膜状部位４１を介して一体形成される。また、オイルシール部材７の上部内周面にはピストンロッド１５の外周面を圧接するシールリップ４３が内方に向かって突設される。オイルシール部材７の下部内周面には支持リング５０が備えられる。なお、シールリップ４３が形成される部位の外周には、シールリップ４３の広がりを抑えるバックアップリング４４が備えられる。   The oil seal member 7 includes a washer 40 and a seal portion, and the seal portion is integrally formed with an outer peripheral seal portion 42 that seals between the outer peripheral surface of the washer 40 and the inner peripheral surface of the outer cylinder 2 via a film-like portion 41. Is done. Further, a seal lip 43 that presses the outer peripheral surface of the piston rod 15 protrudes inward from the upper inner peripheral surface of the oil seal member 7. A support ring 50 is provided on the lower inner peripheral surface of the oil seal member 7. A backup ring 44 that suppresses the spread of the seal lip 43 is provided on the outer periphery of the portion where the seal lip 43 is formed.

ダストシール部材８は、座金４５とシール部からなり、シール部は座金４５の外周面と外筒２の内周面との間をシールする外周シール部４７が膜状部位４６を介して一体形成される。また、ダストシール部材８の下部内周面にはピストンロッド１５の外周面を圧接するシールリップ４８が内方に向かって突設される。なお、シールリップ４８が形成される部位の外周には、シールリップ４８の広がりを抑えるバックアップリング４９が備えられる。
このダストシール部材８の下端面、すなわち、ダストシール部材８の膜状部位４６に固定部材１０ａが当接される。 The dust seal member 8 includes a washer 45 and a seal portion. The seal portion is integrally formed with an outer peripheral seal portion 47 that seals between the outer peripheral surface of the washer 45 and the inner peripheral surface of the outer cylinder 2 via a film-like portion 46. The Further, a seal lip 48 that presses the outer peripheral surface of the piston rod 15 protrudes inward from the lower inner peripheral surface of the dust seal member 8. A backup ring 49 that suppresses the spread of the seal lip 48 is provided on the outer periphery of the portion where the seal lip 48 is formed.
The fixing member 10 a comes into contact with the lower end surface of the dust seal member 8, that is, the film-like portion 46 of the dust seal member 8.

図２及び図６に示すように、固定部材１０ａは円筒状に形成され、その厚みはロッドガイド５ａの厚みに対して略半分程度で、オイルシール部材７の座金４０やダストシール部材８の座金４５の厚みに対して略３倍程度に設定される。また、固定部材１０ａの外径は外筒２の内径に一致し、固定部材１０ａの内径は、オイルシール部材７の座金４０の内径よりも若干大径に形成される。この固定部材１０ａの外周面には、その軸方向略中間部位にカシメ固定用としての断面コ字状の環状凹部５１が形成される。
なお、第１の実施形態では、固定部材１０ａの外周面にカシメ固定用として環状凹部５１を形成したが、周方向に断続させた溝部を形成してもよい。また、環状凹部５１を断面Ｕ字状または断面Ｖ字状に形成してもよい。さらに、環状凹部５１を軸方向に間隔をおいて複数形成してもよい。 As shown in FIGS. 2 and 6, the fixing member 10 a is formed in a cylindrical shape, and its thickness is about half of the thickness of the rod guide 5 a, and the washer 40 of the oil seal member 7 and the washer 45 of the dust seal member 8. Is set to about three times the thickness of the film. Further, the outer diameter of the fixing member 10 a coincides with the inner diameter of the outer cylinder 2, and the inner diameter of the fixing member 10 a is slightly larger than the inner diameter of the washer 40 of the oil seal member 7. On the outer peripheral surface of the fixing member 10a, an annular recess 51 having a U-shaped cross section for fixing caulking is formed at a substantially intermediate portion in the axial direction.
In the first embodiment, the annular recess 51 is formed on the outer peripheral surface of the fixing member 10a for fixing caulking. However, grooves that are intermittent in the circumferential direction may be formed. Moreover, you may form the cyclic | annular recessed part 51 in a cross-sectional U shape or a cross-sectional V shape. Furthermore, a plurality of annular recesses 51 may be formed at intervals in the axial direction.

そして、第１の実施形態に係る油圧シリンダ１ａを構成する際には、図１に示すように、ピストンロッド１５にロッドガイド５ａ、オイルシール部材７、ダストシール部材８及び固定部材１０ａを挿入して、ピストンロッド１５の上端をピストン１４にナット１８により固定しロッドアッセンブリを構成する。続いて、該ロッドアッセンブリを内筒３内に挿入する。続いて、ロッドアッセンブリを内筒３と共に外筒２内に挿入した後、内筒３にがたつきが発生しないように、固定部材１０ａの下端面を受け面として、内筒３を上方から軸方向に加圧する。
その後、この状態を保持した状態で、図２に示すように、外筒２の外周でロッドガイド５ａに設けた環状凹部３９の位置を刃物（図示略）により外方から加圧することにより、外筒２の周壁を内方に突設させた突起部５２をロッドガイド５ａの環状凹部３９に係合させ、ロッドガイド５ａを外筒２にカシメ固定する。さらに、外筒２の外周で固定部材１０ａに設けた環状凹部５１の位置を刃物（図示略）により外方から加圧することにより、外筒２の周壁を内方に突設させた突起部５３を固定部材１０ａの環状凹部５１に係合させ、固定部材１０ａを外筒２にカシメ固定して油圧シリンダ１ａが構成される。 When the hydraulic cylinder 1a according to the first embodiment is configured, the rod guide 5a, the oil seal member 7, the dust seal member 8 and the fixing member 10a are inserted into the piston rod 15 as shown in FIG. The upper end of the piston rod 15 is fixed to the piston 14 with a nut 18 to constitute a rod assembly. Subsequently, the rod assembly is inserted into the inner cylinder 3. Subsequently, after the rod assembly is inserted into the outer cylinder 2 together with the inner cylinder 3, the inner cylinder 3 is pivoted from above using the lower end surface of the fixing member 10a as a receiving surface so that the inner cylinder 3 does not rattle. Pressurize in the direction.
Thereafter, with this state maintained, as shown in FIG. 2, the position of the annular recess 39 provided in the rod guide 5a on the outer periphery of the outer cylinder 2 is pressurized from the outside by a cutter (not shown), thereby The projecting portion 52 with the peripheral wall of the cylinder 2 protruding inward is engaged with the annular recess 39 of the rod guide 5 a, and the rod guide 5 a is caulked and fixed to the outer cylinder 2. Further, the annular recess 51 provided in the fixing member 10a on the outer periphery of the outer cylinder 2 is pressed from the outside by a cutter (not shown) to project the peripheral wall of the outer cylinder 2 inwardly. Is engaged with the annular recess 51 of the fixing member 10a, and the fixing member 10a is caulked and fixed to the outer cylinder 2 to constitute the hydraulic cylinder 1a.

次に、第１の実施形態に係る油圧シリンダ１ａの作用を説明する。
第１及び第２給排口２５、２８に、作動油の給排装置（図示せず）が接続され、第１給排口２５から室２４を介して第１シリンダ室１６内へ作動油を供給すると共に、第２シリンダ室１７内の作動油を通路３３及び連通路９を介して第２給排口２８から排出することにより、ピストンロッド１５が伸長される。
一方、第２給排口２８から通路３３及び連通路９を介して第２シリンダ室１７へ作動油を供給すると共に、第１シリンダ室１６内の作動油を、室２４を介して第１給排口２５から排出することにより、ピストンロッド１５が短縮される。なお、第１及び第２給排口２５、２８を閉じれば、ピストンロッド１５が固定される。 Next, the operation of the hydraulic cylinder 1a according to the first embodiment will be described.
A hydraulic oil supply / discharge device (not shown) is connected to the first and second supply / discharge ports 25, 28, and hydraulic oil is supplied from the first supply / discharge port 25 into the first cylinder chamber 16 through the chamber 24. The piston rod 15 is extended by supplying the hydraulic oil in the second cylinder chamber 17 from the second supply / discharge port 28 via the passage 33 and the communication passage 9 while supplying the hydraulic oil.
On the other hand, the hydraulic oil is supplied from the second supply / discharge port 28 to the second cylinder chamber 17 via the passage 33 and the communication passage 9, and the hydraulic oil in the first cylinder chamber 16 is supplied to the first supply via the chamber 24. By discharging from the outlet 25, the piston rod 15 is shortened. Note that the piston rod 15 is fixed when the first and second supply / discharge ports 25 and 28 are closed.

また、第１及び第２シリンダ室１６、１７に作動油を充填する際には、第１及び第２ブリードプラグ２７、３０を開くことによって、エア抜きを行うようにしている。そこで、このエア抜きに際しては、上述したように、第１ブリード孔２６を室２４の最上部に、第２ブリード孔２９を連通路９の最上部にそれぞれ接続しているため、取付アイ１３を上方に向けて被取付対象に取り付けることにより、効率よくエア抜きを行うことができるようになる。   In addition, when the first and second cylinder chambers 16 and 17 are filled with hydraulic oil, the first and second bleed plugs 27 and 30 are opened to release air. Therefore, when removing the air, as described above, the first bleed hole 26 is connected to the uppermost part of the chamber 24 and the second bleed hole 29 is connected to the uppermost part of the communication path 9. By attaching it to the attached object facing upward, it is possible to perform air bleeding efficiently.

次に、第２の実施形態に係る油圧シリンダ１ｂを図７に基いて説明する。
第２の実施形態に係る油圧シリンダ１ｂを説明する際には、第１の実施形態に係る油圧シリンダ１ａとの相違点のみを説明する。
第２の実施形態に係る油圧シリンダ１ｂでは、ロッドガイド５ｂが上下に２分割されて、上部ロッドガイド５５と下部ロッドガイド５６とから構成される。下部ロッドガイド５６の外周面が外筒２の内周面に当接しており、上部ロッドガイド５５の外径は下部ロッドガイド５６の外径よりも小径で、内筒３の外径と一致するように形成される。
上部ロッドガイド５５は上部大径部５５ａと下部小径部５５ｂとからなり、上部大径部５５ａの外径が内筒３の外径に一致し、該上部大径部５５ａの上端外周縁には、内筒３の下端が嵌合する断面Ｌ字状の環状段部５７が形成される。該環状段部５７と内筒３の下端との間の周方向の一部に、連通路９と第２シリンダ室１７とを連通させる通路３３が形成される。
一方、下部ロッドガイド５６は、その上端面略中央に上部ロッドガイド５５の下部小径部５５ｂを収容する収容部が形成される。該収容部の底部に設けた環状溝部に拡径リング３６及び支持リング３７が備えられる。
なお、第２の実施形態に係る油圧シリンダ１ｂでは、第１の実施形態に係る油圧シリンダ１ａにて行ったロッドガイド５ａの外筒２へのカシメ固定を行わず、固定部材１０ａの外筒２へのカシメ固定だけが行われている。また、第２の実施形態ではロッドガイド５ａを二体で形成している。第１実施形態のロッドガイド５ａも同様に二体で形成してもよい。 Next, a hydraulic cylinder 1b according to a second embodiment will be described with reference to FIG.
When describing the hydraulic cylinder 1b according to the second embodiment, only differences from the hydraulic cylinder 1a according to the first embodiment will be described.
In the hydraulic cylinder 1b according to the second embodiment, the rod guide 5b is divided into two parts in the vertical direction, and is composed of an upper rod guide 55 and a lower rod guide 56. The outer peripheral surface of the lower rod guide 56 is in contact with the inner peripheral surface of the outer cylinder 2, and the outer diameter of the upper rod guide 55 is smaller than the outer diameter of the lower rod guide 56 and matches the outer diameter of the inner cylinder 3. Formed as follows.
The upper rod guide 55 includes an upper large-diameter portion 55a and a lower small-diameter portion 55b. The outer diameter of the upper large-diameter portion 55a matches the outer diameter of the inner cylinder 3, and the upper outer periphery of the upper large-diameter portion 55a An annular step portion 57 having an L-shaped cross section is formed in which the lower end of the inner cylinder 3 is fitted. A passage 33 that connects the communication passage 9 and the second cylinder chamber 17 is formed in a part in the circumferential direction between the annular step portion 57 and the lower end of the inner cylinder 3.
On the other hand, the lower rod guide 56 is formed with an accommodating portion for accommodating the lower small-diameter portion 55b of the upper rod guide 55 at the approximate center of the upper end surface. An enlarged ring 36 and a support ring 37 are provided in an annular groove provided at the bottom of the housing.
In the hydraulic cylinder 1b according to the second embodiment, the rod guide 5a is not fixed to the outer cylinder 2 by the hydraulic cylinder 1a according to the first embodiment, but the outer cylinder 2 of the fixing member 10a. Only the caulking is fixed. In the second embodiment, two rod guides 5a are formed. Similarly, the rod guide 5a of the first embodiment may be formed of two bodies.

次に、第３の実施形態に係る油圧シリンダ１ｃを図８に基いて説明する。
第３の実施形態に係る油圧シリンダ１ｃを説明する際には、第１の実施形態に係る油圧シリンダ１ａとの相違点のみを説明する。
第３の実施形態に係る油圧シリンダ１ｃでは、固定部材１０ｂの厚みが、オイルシール部材７の座金４０やダストシール部材８の座金４５の厚みと略一致している。
そして、第３の実施形態に係る油圧シリンダ１ｃを構成する際には、ピストンロッド１５にロッドガイド５ａ、オイルシール部材７、ダストシール部材８及び固定部材１０ｂを挿入して、ピストンロッド１５の上端をピストン１４にナット１８により固定したロッドアッセンブリを、内筒３と共に外筒２内に挿入した後、固定部材１０ｂの下端面を、外筒２の開口部４内に設置された２分割可能な受け治具（図示略）上に当接させて、内筒３を上方から軸方向に加圧する。 Next, a hydraulic cylinder 1c according to a third embodiment will be described with reference to FIG.
When describing the hydraulic cylinder 1c according to the third embodiment, only differences from the hydraulic cylinder 1a according to the first embodiment will be described.
In the hydraulic cylinder 1c according to the third embodiment, the thickness of the fixing member 10b substantially matches the thickness of the washer 40 of the oil seal member 7 and the washer 45 of the dust seal member 8.
When the hydraulic cylinder 1c according to the third embodiment is configured, the rod guide 5a, the oil seal member 7, the dust seal member 8 and the fixing member 10b are inserted into the piston rod 15, and the upper end of the piston rod 15 is moved. After the rod assembly fixed to the piston 14 with the nut 18 is inserted into the outer cylinder 2 together with the inner cylinder 3, the lower end surface of the fixing member 10 b is received in the opening 4 of the outer cylinder 2 and can be divided into two parts. The inner cylinder 3 is pressed in the axial direction from above by being brought into contact with a jig (not shown).

その後、この状態を保持した状態で、外筒２の外周でロッドガイド５ａに設けた環状凹部３９の位置を刃物（図示略）により外方から加圧することにより、外筒２の周壁を内方に突設させた突起部５２をロッドガイド５ａの環状凹部３９に係合させて、ロッドガイド５ａを外筒２にカシメ固定する。さらに、外筒２の外周で固定部材１０ｂの下端面、すなわち固定部材１０ｂの、外筒２の開放側端面よりも若干下方の位置を刃物（図示略）により外方から加圧することにより、外筒２の周壁を内方に突設させた突起部５３を固定部材１０ｂの下端面に係合させて、固定部材１０ｂを外筒２にカシメ固定する。最後に受け治具を外筒２の開口部４から抜き、分割して油圧シリンダ１ｃから取り外す。第３の実施形態でも第１実施形態とほぼ同等の耐圧を有することができるが、受け冶具の機能も兼ねている第１実施形態とは組付作業性の観点では劣る。   After that, in this state, the position of the annular recess 39 provided in the rod guide 5a on the outer periphery of the outer cylinder 2 is pressurized from the outside by a cutter (not shown), so that the peripheral wall of the outer cylinder 2 is inward. The projecting portion 52 projecting from is engaged with the annular recess 39 of the rod guide 5 a, and the rod guide 5 a is caulked and fixed to the outer cylinder 2. Further, the outer end of the outer cylinder 2 is pressurized by pressing a lower end surface of the fixing member 10b, that is, a position slightly below the end surface of the fixing member 10b on the open side of the outer cylinder 2 from the outside with a blade (not shown). The protrusion 53 with the peripheral wall of the cylinder 2 protruding inward is engaged with the lower end surface of the fixing member 10 b, and the fixing member 10 b is caulked and fixed to the outer cylinder 2. Finally, the receiving jig is pulled out from the opening 4 of the outer cylinder 2, divided and removed from the hydraulic cylinder 1c. The third embodiment can have a pressure resistance substantially equal to that of the first embodiment, but is inferior to the first embodiment also serving as a receiving jig from the viewpoint of assembly workability.

以上説明した、本発明の第１〜第３の実施形態に係る油圧シリンダ１ａ〜１ｃでは、固定部材１０ａ、１０ｂを外筒２とカシメ固定することで外筒２の開口部４を閉塞しているので、雌ねじ加工を施したキャップを外筒２の外周に螺着して開口部４を閉塞する従来技術と比較すると、部品加工において雌ねじ加工を必要とせず非常に細かい切り屑等が外筒２内に混入するのを抑制することができ、しかも、締付トルク管理等の煩雑な組付作業を行わずに済み作業効率が向上する。
そこで、第１〜第３の実施形態に係る油圧シリンダ１ａ〜１ｃのうち第１の実施形態に係る油圧シリンダ１ａが耐圧及び組付作業性の観点から最も好ましく、内圧による外筒２の変形が少ないものであれば、第２または第３の実施形態に係る油圧シリンダ１ｂまたは１ｃを採用することができる。 In the hydraulic cylinders 1a to 1c according to the first to third embodiments of the present invention described above, the fixing member 10a and 10b are caulked and fixed to the outer cylinder 2 to close the opening 4 of the outer cylinder 2. Therefore, compared with the prior art in which a cap subjected to female threading is screwed onto the outer periphery of the outer cylinder 2 and the opening 4 is closed, internal thread machining is not required for parts processing, and very fine chips etc. 2 can be suppressed, and complicated work such as tightening torque management is not performed and work efficiency is improved.
Therefore, among the hydraulic cylinders 1a to 1c according to the first to third embodiments, the hydraulic cylinder 1a according to the first embodiment is most preferable from the viewpoints of pressure resistance and assembly workability, and deformation of the outer cylinder 2 due to internal pressure. If there are few, the hydraulic cylinder 1b or 1c which concerns on 2nd or 3rd embodiment is employable.

なお、本発明の第１〜第３の実施形態に係る油圧シリンダ１ａ〜１ｃは、サスペンション装置の前後スタビライザの作動を制御すべく採用されるが、他の複動式の油圧シリンダやシリンダの両端が開口しており、それぞれの開口部からピストンロッドが突出している両ロッドの油圧シリンダにも同様に適用することができる。   The hydraulic cylinders 1a to 1c according to the first to third embodiments of the present invention are adopted to control the operation of the front and rear stabilizers of the suspension device, but other double-acting hydraulic cylinders and both ends of the cylinders are used. Can be similarly applied to the hydraulic cylinders of both rods in which the piston rods protrude from the respective openings.

１ａ〜１ｃ 油圧シリンダ（シリンダ装置），２ 外筒（シリンダ），３ 内筒（シリンダ），４ 開口部，５ａ、５ｂ ロッドガイド，６ 密封部材，７ オイルシール部材，８ ダストシール部材，１０ａ、１０ｂ 固定部材，１４ ピストン，１５ ピストンロッド，１６ 第１シリンダ室，１７ 第２シリンダ室，３９、５１ 環状凹部（カシメ用），５２、５３ 突起部   DESCRIPTION OF SYMBOLS 1a-1c Hydraulic cylinder (cylinder apparatus), 2 outer cylinder (cylinder), 3 inner cylinder (cylinder), 4 opening part, 5a, 5b rod guide, 6 sealing member, 7 oil seal member, 8 dust seal member, 10a, 10b Fixed member, 14 piston, 15 piston rod, 16 first cylinder chamber, 17 second cylinder chamber, 39, 51 annular recess (for caulking), 52, 53 protrusion

Claims (2)

少なくとも一端に開口部を有するシリンダと、該シリンダ内に摺動自在に挿入されシリンダ内を２室に画成するピストンと、前記シリンダの開口部に挿入されシリンダ内を密封する環状の密封部材と、前記シリンダの開口部に挿入され、前記密封部材に対して前記シリンダの開放側に配置され外周に凹部が形成された環状の固定部材と、前記シリンダ内に前記密封部材及び前記固定部材を介して挿入され、前記ピストンと一体的に移動するピストンロッドとを備え、前記シリンダの周壁を内方に突設させた突起部を前記固定部材の凹部に係合させたことを特徴とするシリンダ装置。   A cylinder having an opening at at least one end; a piston that is slidably inserted into the cylinder and that defines the inside of the cylinder in two chambers; and an annular sealing member that is inserted into the opening of the cylinder and seals the cylinder An annular fixing member that is inserted into the opening of the cylinder, is disposed on the open side of the cylinder with respect to the sealing member and has a recess formed on the outer periphery thereof, and the sealing member and the fixing member are interposed in the cylinder. And a piston rod that moves integrally with the piston, and a projecting portion in which a peripheral wall of the cylinder projects inwardly engages with a recessed portion of the fixing member. . 前記シリンダの開口部に挿入され、前記密封部材に対してシリンダの底部側に配置されるロッドガイドを備え、該ロッドガイドの外周に凹部を設け、シリンダの周壁を内方に突設させた突起部を前記ロッドガイドの凹部に係合させることを特徴とする請求項１に記載のシリンダ装置。   A projection that is inserted into the opening of the cylinder and includes a rod guide disposed on the bottom side of the cylinder with respect to the sealing member, a recess is provided on the outer periphery of the rod guide, and a peripheral wall of the cylinder is projected inward. The cylinder device according to claim 1, wherein a portion is engaged with a concave portion of the rod guide.
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