JP6643869B2 - Multi-stage hydraulic cylinder - Google Patents
Multi-stage hydraulic cylinder Download PDFInfo
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- 239000012530 fluid Substances 0.000 claims description 192
- 230000002093 peripheral effect Effects 0.000 description 9
- 238000007789 sealing Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Description
本発明は、複数の流体圧シリンダを同心状に組み込んで夫々独立に作動可能にした複数段流体圧シリンダに関するものである。 The present invention relates to a multi-stage hydraulic cylinder in which a plurality of hydraulic cylinders are incorporated concentrically and can be operated independently of each other.
クレーン等の伸縮ブームは、複数のブームをテレスコープ式に伸縮自在に構成し、これら複数のブームの内部に、複数段に伸縮可能な複動形テレスコピック油圧シリンダを組み込み、複動形テレスコピック油圧シリンダを伸縮させることで、複数のブームを伸縮させるように構成してある（例えば、特許文献１参照）。 Telescopic booms such as cranes are constructed by telescopically extending a plurality of booms, and a double-acting telescopic hydraulic cylinder that can expand and contract in multiple stages is built inside these multiple booms. Is configured to extend and contract a plurality of booms (for example, see Patent Document 1).
複数段に伸縮可能な複動形テレスコピック油圧シリンダの一例について、図５（ａ）〜（ｄ）に基づいて説明する。このテレスコピック油圧シリンダ１００は、シリンダ部材１０１、第１ピストン部材１０２、第２ピストン部材１０３、シリンダ部材１０１内にこのシリンダ部材１０１と第１ピストン部材１０２とで形成された第１伸長用油室１０４及び第１退入用油室１０５、第１ピストン部材１０２内にこの第１ピストン部材１０２と第２ピストン部材１０３とで形成された第２伸長用油室１０６及び第２退入用油室１０７、第１ピストン部材１０２の第１ピストン部１０２ａから延びて第２ピストン部材１０３のピストン部１０３ａを摺動自在に貫通する油路形成管１０８、複数のポート１０９，１１０、連通油路１１１〜１１４等を備えている。 An example of a double-acting telescopic hydraulic cylinder that can expand and contract in a plurality of stages will be described with reference to FIGS. The telescopic hydraulic cylinder 100 includes a cylinder member 101, a first piston member 102, a second piston member 103, and a first extension oil chamber 104 formed in the cylinder member 101 by the cylinder member 101 and the first piston member 102. A first retraction oil chamber 105 and a second elongation oil chamber 106 and a second retraction oil chamber 107 formed in the first piston member 102 by the first piston member 102 and the second piston member 103. An oil passage forming pipe 108 extending from the first piston portion 102a of the first piston member 102 and slidably penetrating the piston portion 103a of the second piston member 103, a plurality of ports 109 and 110, and communication oil passages 111 to 114. Etc. are provided.
このテレスコピック油圧シリンダ１００においては、第１，第２伸長用油室１０４，１０６が連通し、第１，第２退入用油室１０５，１０７が連通しているため、伸長駆動させる際には、第１ピストン部材１０２の伸長動作に続いて第２ピストン部材１０３の伸長動作がなされ、退入駆動させる際には、第２ピストン部材１０３の退入動作に続いて第１ピストン部材１０２の退入動作がなされる。 In the telescopic hydraulic cylinder 100, since the first and second extension oil chambers 104 and 106 communicate with each other, and the first and second retraction oil chambers 105 and 107 communicate with each other, the extension cylinder is driven when extending. The extension operation of the second piston member 103 is performed following the extension operation of the first piston member 102, and when the second piston member 103 is driven to retract, the retraction of the first piston member 102 is performed following the retraction operation of the second piston member 103. Input operation is performed.
従来のテレスコピック油圧シリンダ１００においては、第１，第２伸長用油圧室１０４，１０６が連通し、第１，第２退入用油室１０５，１０７が連通しているため、第１，第２ピストン部材１０１，１０３を互いに独立に動作させることはできない。即ち、第１ピストン部材１０２を伸長又は退入状態に保持したまま、第２ピストン部材１０３のみを伸長又は退入させることはできず、第２ピストン部材１０３を伸長又は退入状態に保持したまま、第１ピストン部材１０２のみを伸長又は退入させることはできない。そのため、複動形テレスコピック油圧シリンダ１００の用途が限られ、汎用性の低いものであった。 In the conventional telescopic hydraulic cylinder 100, the first and second extension hydraulic chambers 104 and 106 communicate with each other, and the first and second retreat oil chambers 105 and 107 communicate with each other. The piston members 101, 103 cannot be operated independently of each other. That is, only the second piston member 103 cannot be extended or retracted while the first piston member 102 is maintained in the extended or retracted state, and the second piston member 103 is retained in the extended or retracted state. , It is not possible to extend or retract only the first piston member 102. Therefore, the use of the double-acting telescopic hydraulic cylinder 100 is limited, and the versatility is low.
本発明の目的は、上記に鑑み、第１，第２ピストン部材を互いに独立に伸長側と退入側へ駆動可能な複数段流体圧シリンダを提供することである。 SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a multi-stage fluid pressure cylinder capable of driving a first and a second piston member to an extension side and a retraction side independently of each other.
請求項１の複数段流体圧シリンダは、複数の流体圧シリンダを同心状に組み込んだ複数段流体圧シリンダにおいて、シリンダ部材と、このシリンダ部材内の第１シリンダ孔に摺動自在に装着され且つシリンダ部材と協働して第１伸長用流体室と第１退入用流体室を形成する第１ピストン部材と、前記第１ピストン部材内の第２シリンダ孔に摺動自在に装着され且つ第１ピストン部材と協働して第２伸長用流体室と第２退入用流体室とを形成する第２ピストン部材と、前記第１伸長用流体室と第１退入用流体室に夫々連通するように前記シリンダ部材に形成された第１伸長用流体通路と第１退入用流体通路と、前記第２伸長用流体室と第２退入用流体室に夫々連通するように且つ前記第１伸長用流体通路と第１退入用流体通路とは独立に形成された第２伸長用流体通路と第２退入用流体通路とを備え、
前記第１ピストン部材のピストン部から第１伸長用流体室とシリンダ部材とを貫通してシリンダ部材外まで延びる通路形成用ロッド部を設け、前記第２伸長用流体通路と第２退入用流体通路が前記第１ピストン部材と通路形成用ロッド部とに形成され、前記シリンダ部材の端部に内嵌螺合された第１の段付き筒体を設け、この第１の段付き筒体に前記第１ピストン部材のピストンロッド部が挿通する第１のロッド孔が形成され、前記シリンダ部材の端壁部の中央部の開口孔に内嵌螺合された第２の段付き筒体を設け、この第２の段付き筒体に前記通路形成用ロッド部が挿通する第２のロッド孔が形成されたことを特徴としている。
The multi-stage hydraulic cylinder according to claim 1 is a multi-stage hydraulic cylinder in which a plurality of hydraulic cylinders are concentrically assembled, and is slidably mounted in a cylinder member and a first cylinder hole in the cylinder member. A first piston member cooperating with a cylinder member to form a first elongation fluid chamber and a first retraction fluid chamber; a first piston member slidably mounted in a second cylinder bore in the first piston member; A second piston member forming a second extension fluid chamber and a second retraction fluid chamber in cooperation with the one piston member, and communicating with the first extension fluid chamber and the first retraction fluid chamber, respectively; The first extension fluid passage and the first retraction fluid passage formed in the cylinder member so as to communicate with the second extension fluid chamber and the second retraction fluid chamber, respectively, and The first extension fluid passage and the first retraction fluid passage are formed independently. Second and a decompression fluid passage and the second withdrawal needful fluid passageway,
A passage forming rod extending from the piston portion of the first piston member to the outside of the cylinder member through the first extension fluid chamber and the cylinder member; and providing the second extension fluid passage and the second retreat fluid. A passage is formed in the first piston member and the passage-forming rod portion, and a first stepped cylinder which is internally screwed into an end of the cylinder member is provided. A second stepped cylindrical body is formed, in which a first rod hole through which a piston rod portion of the first piston member is inserted is formed, and which is internally screwed into an opening in a central portion of an end wall of the cylinder member. A second rod hole through which the passage-forming rod portion is inserted is formed in the second stepped cylindrical body .
この複数段流体圧シリンダにおいては、第１ピストン部材は第１伸長用流体室の流体圧を受圧して伸長側へ駆動され、また、第１退入用流体室の流体圧を受圧して退入側へ駆動される。同様に、第２ピストン部材は第２伸長用流体室の流体圧を受圧して伸長側へ駆動され、また、第２退入用流体室の流体圧を受圧して退入側へ駆動される。 In this multi-stage fluid pressure cylinder, the first piston member receives the fluid pressure of the first extension fluid chamber and is driven to the extension side, and receives the fluid pressure of the first retraction fluid chamber and retreats. Driven to the entry side. Similarly, the second piston member receives the fluid pressure of the second extension fluid chamber and is driven to the extension side, and receives the fluid pressure of the second retraction fluid chamber and is driven to the entry side. .
前記課題解決手段の欄に記載の構成を有するため、本願発明は次の効果を奏する。
請求項１の発明によれば、第１伸長用流体通路から第１伸長用流体室に流体圧を給排可能であり、第１退入用流体通路から第１退入用流体室に流体圧を給排可能である。同様に、第２伸長用流体通路から第２伸長用流体室に流体圧を給排可能であり、第２退入用流体通路から第２退入用流体室に流体圧を給排可能である。第２伸長用流体通路と第２退入用流体通路は、第１伸長用流体通路と第１退入用流体通路とは独立に形成されている。
Since the present invention has the configuration described in the section of the problem solving means, the present invention has the following effects.
According to the first aspect of the present invention, it is possible to supply and discharge the fluid pressure from the first extension fluid passage to the first extension fluid chamber, and to supply the fluid pressure from the first retraction fluid passage to the first retraction fluid chamber. Can be supplied and discharged. Similarly, fluid pressure can be supplied and discharged from the second extension fluid passage to the second extension fluid chamber, and fluid pressure can be supplied and discharged from the second retraction fluid passage to the second retraction fluid chamber. . The second extending fluid passage and the second retreating fluid passage are formed independently of the first extending fluid passage and the first retreating fluid passage.
それ故、第１，第２ピストン部材を、互いに独立に伸長側へ駆動したり、退入側へ駆動したりすることができる。そのため、この複数段流体圧シリンダにおいては、第１ピストン部材だけを伸長させたり、第２ピストン部材だけを伸長させたり、第１ピストン部材と第２ピストン部材の両方を伸長させたりすることができる。それ故、この複数段流体圧シリンダは、汎用性に優れた流体圧シリンダとなる。 Therefore, the first and second piston members can be independently driven to the extension side or to the retraction side. Therefore, in this multi-stage fluid pressure cylinder, only the first piston member can be extended, only the second piston member can be extended, or both the first piston member and the second piston member can be extended. . Therefore, this multi-stage fluid pressure cylinder becomes a fluid cylinder excellent in versatility.
そして、第１ピストン部材に通路形成用ロッド部を設け、第２伸長用流体通路と第２退入用流体通路を前記第１ピストン部材と通路形成用ロッド部とに形成するため、第１，第２ピストン部材が伸長していく側とは反対側から第２伸長用流体通路と第２退入用流体通路に流体圧を供給／排出可能になる。 Then, the passage-forming rod portion provided in the first piston member, since the second extending fluid passage and the second withdrawal needful fluid passage formed in said first piston member and the passage forming rod portions, the first, Fluid pressure can be supplied / discharged from the side opposite to the side where the second piston member extends to the second extending fluid passage and the second retreating fluid passage.
本発明を実施するための形態について実施例に基づいて説明する。 Embodiments for carrying out the present invention will be described based on embodiments.
本発明の実施例に係る複数段流体圧シリンダ１について説明する。
図１に示すように、この複数段流体圧シリンダ１は、複数の流体圧シリンダ1Ａ，１Ｂを同心状に組み込んだものである。
A multi-stage hydraulic cylinder 1 according to an embodiment of the present invention will be described.
As shown in FIG. 1, this multi-stage fluid pressure cylinder 1 has a plurality of fluid pressure cylinders 1A and 1B concentrically assembled.
複数段流体圧シリンダ１は、シリンダ部材２と、第１ピストン部材３と、第２ピストン部材４と、シリンダ部材２と第１ピストン部材３とで形成された第１伸長用流体室５及び第１退入用流体室６と、第１ピストン部材２と第２ピストン部材４とで形成された第２伸長用流体室７及び第２退入用流体室８と、第１伸長用流体通路９と、第１退入用流体通路１０と、第２伸長用流体通路１１と、第２退入用流体通路１２等を備えている。
尚、シリンダ部材２と、第１，第２ピストン部材３，４と、第１，第２伸長用流体室５，７と、第１，第２退入用流体室６，８は、同心状に形成されている。
The multi-stage hydraulic cylinder 1 includes a first elongating fluid chamber 5 and a first elongating fluid chamber 5 formed by a cylinder member 2, a first piston member 3, a second piston member 4, a cylinder member 2 and a first piston member 3. A first retraction fluid chamber 6, a second extension fluid chamber 7 and a second retraction fluid chamber 8 formed by the first piston member 2 and the second piston member 4, and a first extension fluid passage 9 , A first retreating fluid passage 10, a second elongating fluid passage 11, a second retreating fluid passage 12, and the like.
The cylinder member 2, the first and second piston members 3, 4, the first and second extending fluid chambers 5, 7, and the first and second retreating fluid chambers 6, 8 are concentric. Is formed.
尚、第１流体圧シリンダ１Ａは、シリンダ部材２と、第１ピストン部材３と、第１伸長用流体室５及び第１退入用流体室６と、第１伸長用流体通路９及び第１退入用流体通路１０等で構成され、第２流体圧シリンダ１Ｂは、第１ピストン部材３と、第２ピストン部材４と、第２伸長用流体室７及び第２退入用流体室８と、第２伸長用流体通路１１及び第２退入用流体通路１２等で構成されている。 The first fluid pressure cylinder 1A includes a cylinder member 2, a first piston member 3, a first extension fluid chamber 5, a first retraction fluid chamber 6, a first extension fluid passage 9, and a first extension fluid chamber 9. The second hydraulic cylinder 1 </ b> B includes a first piston member 3, a second piston member 4, a second extension fluid chamber 7 and a second retraction fluid chamber 8. , A second elongating fluid passage 11 and a second retreating fluid passage 12.
シリンダ部材２は、周壁部２ａと、この周壁部２ａの下端部を閉塞する端壁部２ｂとを有するカップ状の部材であり、内部に第１シリンダ孔２ｃが形成され、第１シリンダ孔２ｃの上端部に連なるロッド孔１３ａは、周壁部２ａの上端部分に内嵌状に螺合された段付き筒体１３に形成されている。端壁部２ｂの中央部の開口孔には段付き筒体１４が螺合され、この段付き筒体１４にロッド孔１４ａが形成されている。 The cylinder member 2 is a cup-shaped member having a peripheral wall portion 2a and an end wall portion 2b for closing a lower end portion of the peripheral wall portion 2a, and has a first cylinder hole 2c formed therein, and a first cylinder hole 2c. Is formed in the stepped cylindrical body 13 which is screwed into the upper end portion of the peripheral wall portion 2a so as to be fitted into the rod hole 13a. A stepped cylinder 14 is screwed into an opening hole at the center of the end wall 2b, and a rod hole 14a is formed in the stepped cylinder 14.
第１ピストン部材３は、シリンダ部材２内の第１シリンダ孔２ｃに摺動自在に装着され且つシリンダ部材２と協働して第１伸長用流体室５と第１退入用流体室６を形成している。第１ピストン部材３はほぼカップ状に形成され、第１ピストン部材３は、第１シリンダ孔２ｃに流体密に摺動自在に装着されたピストン部３ａと、このピストン部３ａよりも小径で且つピストン部３ａから上方へ延び且つ段付き筒体１３のロッド孔１３ａを挿通してシリンダ部材２の外部まで延びるピストンロッド部３ｂとを有する。
第１伸長用流体室５は、第１シリンダ孔２ｃ内で端壁部２ｂとピストン部３ａの間に形成され、第１退入用流体室６は第１シリンダ孔２ｃ内でピストン部３ａと段付き筒体１３の間に形成されている。
The first piston member 3 is slidably mounted in the first cylinder hole 2c in the cylinder member 2 and cooperates with the cylinder member 2 to form the first extension fluid chamber 5 and the first retraction fluid chamber 6. Has formed. The first piston member 3 is formed substantially in a cup shape. The first piston member 3 has a piston portion 3a slidably mounted in the first cylinder hole 2c in a fluid-tight manner, and has a smaller diameter than the piston portion 3a. And a piston rod portion 3b extending upward from the piston portion 3a and extending to the outside of the cylinder member 2 through the rod hole 13a of the stepped cylindrical body 13.
The first elongating fluid chamber 5 is formed between the end wall 2b and the piston 3a in the first cylinder hole 2c, and the first retreating fluid chamber 6 is formed in the first cylinder hole 2c with the piston 3a. It is formed between the stepped cylindrical bodies 13.
第１ピストン部材３のピストン部３ａの下端中央部から第１伸長用流体室５とシリンダ部材２の端壁部２ｂを貫通して下方へ突出する通路形成用ロッド部１５が第１ピストン部材３に一体形成されている。 The first piston member 3 has a passage-forming rod portion 15 that projects downward from the center of the lower end of the piston portion 3a through the first elongating fluid chamber 5 and the end wall portion 2b of the cylinder member 2. Are integrally formed.
ピストン部３ａの外周部には第１伸長用流体室５と第１退入用流体室６間をシールするシール部材１６ａが装着されている。段付き筒体１３の内周部には、第１退入用流体室６から流体圧が漏れないようにシールするシール部材１６ｂが装着されている。通路形成用ロッド部１５は段付き筒体１４のロッド孔１４ａに流体密に摺動自在に挿入されてシリンダ部材２の下方まで突出している。段付き筒体１４の内周部には、第１伸長用流体室５から流体圧が漏れないようにシールするシール部材１４ｂが装着されている。 A seal member 16a for sealing between the first elongating fluid chamber 5 and the first retreating fluid chamber 6 is mounted on the outer peripheral portion of the piston portion 3a. A seal member 16b that seals so that fluid pressure does not leak from the first retraction fluid chamber 6 is mounted on the inner peripheral portion of the stepped cylindrical body 13. The passage-forming rod portion 15 is slidably inserted into the rod hole 14 a of the stepped cylindrical body 14 in a fluid-tight manner and protrudes below the cylinder member 2. A seal member 14b for sealing the inner peripheral portion of the stepped cylindrical body 14 so that fluid pressure does not leak from the first elongating fluid chamber 5 is mounted.
第１シリンダ孔２ｃ内において、ピストン部３ａの下側に第１伸長用流体室５が形成され、ピストン部３ａの上側に第１退入用流体室６が形成されている。第１伸長用流体室５に連通する第１伸長用流体通路９が端壁部２ｂに形成され、第１退入用流体室６に連通する第１退入用流体通路１０が端壁部２ｂと周壁部２ａに形成されている。第１伸長用流体通路９と第１退入用流体通路１０は、ホースや配管により流体圧供給源（図示略）に夫々接続される。 In the first cylinder hole 2c, a first extension fluid chamber 5 is formed below the piston portion 3a, and a first retraction fluid chamber 6 is formed above the piston portion 3a. A first extension fluid passage 9 communicating with the first extension fluid chamber 5 is formed in the end wall 2b, and a first retreat fluid passage 10 communicating with the first retraction fluid chamber 6 is formed in the end wall 2b. And the peripheral wall 2a. The first elongating fluid passage 9 and the first retreating fluid passage 10 are respectively connected to a fluid pressure supply source (not shown) by a hose or a pipe.
第１ピストン部材３の内部に第２シリンダ孔１７が形成され、第２シリンダ孔１７の上端部分に連なるロッド孔１８ａは、第１ピストン部材３の上端部分に内嵌螺合された段付き筒体１８に形成されている。第２ピストン部材４は、第１ピストン部材３内の第２シリンダ孔１７に摺動自在に装着され且つ第１ピストン部材３と協働して第２伸長用流体室７と第２退入用流体室８とを形成している。 A second cylinder hole 17 is formed inside the first piston member 3, and a rod hole 18 a connected to an upper end portion of the second cylinder hole 17 is a stepped cylinder screwed into the upper end portion of the first piston member 3. Formed on body 18. The second piston member 4 is slidably mounted in the second cylinder hole 17 in the first piston member 3 and cooperates with the first piston member 3 to provide the second elongating fluid chamber 7 and the second retreating member. And a fluid chamber 8.
第２ピストン部材４は、ピストン部４ａと、このピストン部４ａよりも小径で且つピストン部４ａから上方へ延びるピストンロッド部４ｂとを有し、ピストン部４ａが第２シリンダ孔１７に流体密に摺動自在に装着されている。第２シリンダ孔１７において、ピストン部４ａの下側に第２伸長用流体室７が形成され、ピストン部４ａと段付き筒体１８の間に第２退入用流体室８が形成されている。 The second piston member 4 has a piston portion 4a and a piston rod portion 4b having a smaller diameter than the piston portion 4a and extending upward from the piston portion 4a. It is slidably mounted. In the second cylinder hole 17, a second extension fluid chamber 7 is formed below the piston portion 4a, and a second retreat fluid chamber 8 is formed between the piston portion 4a and the stepped cylinder 18. .
前記ピストン部４ａの外周部には、第２伸長用流体室７と第２退入用流体室８間をシールするシール部材１９が装着されている。段付き筒体１８の内周部には第２退入用流体室８から流体圧が漏れないようにシールするシール部材２０が装着されている。 A seal member 19 for sealing between the second elongating fluid chamber 7 and the second retreating fluid chamber 8 is mounted on an outer peripheral portion of the piston portion 4a. A seal member 20 for sealing so that fluid pressure does not leak from the second retraction fluid chamber 8 is mounted on the inner peripheral portion of the stepped cylindrical body 18.
第２伸長用流体室７に連通する第２伸長用流体通路１１が通路形成用ロッド部１５と端壁部３ａとに形成され、第２退入用流体室８に連通する第２退入用流体通路１２が通路形成用ロッド部１５と端壁部３ａとピストンロッド部３ｂに形成されている。尚、第２伸長用流体通路１１と第２退入用流体通路１２は、第１伸長用流体通路９と第１退入用流体通路１０とは独立に形成されている。そのため、第１，第２伸長用流体室５，７は連通しておらず、第１，第２退入用流体室６，８は連通してない。尚、第２伸長用流体通路１１と第２退入用流体通路１２は、ホース又は配管により流体圧供給源（図示略）に接続されている。 A second elongating fluid passage 11 communicating with the second elongating fluid chamber 7 is formed in the passage forming rod portion 15 and the end wall 3a, and a second retreating fluid communicating with the second retreating fluid chamber 8 is formed. The fluid passage 12 is formed in the passage forming rod 15, the end wall 3a, and the piston rod 3b. The second extending fluid passage 11 and the second retreating fluid passage 12 are formed independently of the first extending fluid passage 9 and the first retreating fluid passage 10. Therefore, the first and second extending fluid chambers 5 and 7 are not in communication, and the first and second retreating fluid chambers 6 and 8 are not in communication. The second extending fluid passage 11 and the second retreating fluid passage 12 are connected to a fluid pressure supply source (not shown) by a hose or a pipe.
次に、以上説明した複数段流体圧シリンダ１の作用、効果について説明する。
この複数段流体圧シリンダ１においては、第１ピストン部材３は第１伸長用流体室５の流体圧を受圧して伸長側（上方）へ駆動され、また、第１退入用流体室６の流体圧を受圧して退入（下方）側へ駆動される。同様に、第２ピストン部材４は第２伸長用流体室７の流体圧を受圧して伸長側（上方）へ駆動され、また、第２退入用流体室８の流体圧を受圧して退入側（下方）へ駆動される。
Next, the operation and effect of the above-described multi-stage fluid pressure cylinder 1 will be described.
In the multi-stage fluid pressure cylinder 1, the first piston member 3 receives the fluid pressure of the first extending fluid chamber 5 and is driven toward the extending side (upward). It is driven to the retreat (downward) side by receiving the fluid pressure. Similarly, the second piston member 4 receives the fluid pressure of the second extension fluid chamber 7 and is driven to the extension side (upward), and receives the fluid pressure of the second retraction fluid chamber 8 to retreat. It is driven to the entry side (downward).
第１伸長用流体通路９から第１伸長用流体室５に流体圧を供給／排出可能であり、第１退入用流体通路１０から第１退入用流体室６に流体圧を供給／排出可能である。同様に、第２伸長用流体通路１１から第２伸長用流体室７に流体圧を供給/排出可能であり、第２退入用流体通路１２から第２退入用流体室８に流体圧を供給/排出可能である。しかも、第２伸長用流体通路１１と第２退入用流体通路１２は、第１伸長用流体通路９と第１退入用流体通路１０とは独立に形成されている。 Fluid pressure can be supplied / discharged from the first extension fluid passage 9 to the first extension fluid chamber 5, and fluid pressure can be supplied / discharged from the first retraction fluid passage 10 to the first retraction fluid chamber 6. It is possible. Similarly, it is possible to supply / discharge fluid pressure from the second extension fluid passage 11 to the second extension fluid chamber 7, and to apply fluid pressure from the second retraction fluid passage 12 to the second retraction fluid chamber 8. Can be supplied / discharged. Moreover, the second extending fluid passage 11 and the second retreating fluid passage 12 are formed independently of the first extending fluid passage 9 and the first retreating fluid passage 10.
それ故、第１，第２ピストン部材３，４を、互いに独立に伸長側へ駆動したり、退入側へ駆動したりすることができる。そのため、この複数段流体圧シリンダ１においては、図１に示すように第１，第２ピストン部材3，４を両方とも退入状態に保持したり、図２に示すように第１ピストン部材３だけを伸長させたり、図３に示すように第２ピストン部材４だけを伸長させたり、図４に示すように第１，第２ピストン部材３，４の両方を伸長させたりすることができる。その結果、この複数段流体圧シリンダ１は、汎用性に優れた流体圧シリンダとなる。 Therefore, the first and second piston members 3 and 4 can be independently driven to the extension side or to the retraction side. Therefore, in the multi-stage fluid pressure cylinder 1, both the first and second piston members 3, 4 are held in a retracted state as shown in FIG. 3 or only the second piston member 4 as shown in FIG. 3, or both the first and second piston members 3 and 4 as shown in FIG. As a result, the multi-stage fluid pressure cylinder 1 is a fluid pressure cylinder excellent in versatility.
第１ピストン部材３に通路形成用ロッド部１５を設け、第２伸長用流体通路１１と第２退入用流体通路１２を第１ピストン部材３と通路形成用ロッド部１５とに形成するため、第１，第２ピストン部材３，４が伸長していく側とは反対側に第２伸長用流体通路１１と第２退入用流体通路１２の通路端を形成することができる。 In order to provide the first piston member 3 with the passage forming rod portion 15 and to form the second elongating fluid passage 11 and the second retreating fluid passage 12 in the first piston member 3 and the passage forming rod portion 15, The passage ends of the second extension fluid passage 11 and the second retraction fluid passage 12 can be formed on the side opposite to the side where the first and second piston members 3 and 4 extend.
第１伸長用流体通路９と第１退入用流体通路１０をシリンダ部材２に形成したため、第１，第２ピストン部材３，４が伸長していく側とは反対側に第１伸長用流体通路９と第２退入用流体通路１０の通路端を形成することができる。
この複数段流体圧シリンダ１は、部材や物体を移動させたり、伸縮させたりする種々の産業上の用途に適用することができる。
Since the first elongating fluid passage 9 and the first retreating fluid passage 10 are formed in the cylinder member 2, the first elongating fluid is located on the side opposite to the side where the first and second piston members 3, 4 extend. A passage end of the passage 9 and the second retreating fluid passage 10 can be formed.
The multi-stage fluid pressure cylinder 1 can be applied to various industrial uses for moving or expanding and contracting members and objects.
次に、前記実施例を部分的に変更する変更例について説明する。
（１）複数段流体圧シリンダは、複数段油圧シリンダにも適用でき、複数段エアシリンダにも適用でき、その他の複数段流体圧シリンダにも適用できる。
（２）第１，第２ピストン部材の最大伸長量は同じでもよく、異なってもよい。
Next, a description will be given of a modification in which the embodiment is partially changed.
(1) The multi-stage fluid pressure cylinder can be applied to a multi-stage hydraulic cylinder, a multi-stage air cylinder, and also applicable to other multi-stage fluid pressure cylinders.
(2) The maximum extension amounts of the first and second piston members may be the same or different.
（３）前記通路形成用ロッド部を省略し、第１伸長用流体通路と第１退入用流体通路を第１ピストン部材に形成してもよく、この場合第１ピストン部材の上端側に第１伸長用流体通路と第１退入用流体通路の通路端を形成してもよい。 (3) The passage forming rod portion may be omitted, and the first elongating fluid passage and the first retreating fluid passage may be formed in the first piston member. The passage ends of the first extension fluid passage and the first retraction fluid passage may be formed.
（４）第２伸長用流体通路と第２退入用流体通路を第２ピストン部材に形成し、第２ピストンの上端側に、第２伸長用流体通路と第２退入用流体通路の通路端を形成してもよい。
（５）その他、当業者ならば、前記実施例に種々の変更を付加した形態で実施可能であり、本発明はそのような変更形態も包含するものである。
(4) A second extension fluid passage and a second retraction fluid passage are formed in the second piston member, and a second extension fluid passage and a second retraction fluid passage are provided at the upper end side of the second piston. An edge may be formed.
(5) In addition, those skilled in the art can implement the present invention in a form in which various modifications are added to the above-described embodiment, and the present invention includes such modifications.
１ 複数段流体圧シリンダ
２ シリンダ部材
２ｃ 第１シリンダ孔
３ 第１ピストン部材
４ 第２ピストン部材
５ 第１伸長用流体室
６ 第１退入用流体室
７ 第２伸長用流体室
８ 第２退入用流体室
９ 第１伸長用流体通路
１０ 第１退入用流体通路
１１ 第２伸長用流体通路
１２ 第２退入用流体通路
１３ 段付き筒体（第１の段付き筒体）
１３ａ ロッド孔（第１のロッド孔）
１４ 段付き筒体（第２の段付き筒体）
１４ａ ロッド孔（第２のロッド孔）
１５ 通路形成用ロッド部
１７ 第２シリンダ孔
DESCRIPTION OF SYMBOLS 1 Multistage hydraulic cylinder 2 Cylinder member 2c 1st cylinder hole 3 1st piston member 4 2nd piston member 5 1st extension fluid chamber 6 1st retreat fluid chamber 7 2nd extension fluid chamber 8 2nd retreat Input fluid chamber 9 First extension fluid passage 10 First retraction fluid passage 11 Second extension fluid passage 12 Second retraction fluid passage
13 stepped cylinder (first stepped cylinder)
13a rod hole (first rod hole)
14 stepped cylinder (second stepped cylinder)
14a rod hole (second rod hole)
15 Rod part 17 for passage formation 2nd cylinder hole
Claims (1)
シリンダ部材と、
このシリンダ部材内の第１シリンダ孔に摺動自在に装着され且つシリンダ部材と協働して第１伸長用流体室と第１退入用流体室を形成する第１ピストン部材と、
前記第１ピストン部材内の第２シリンダ孔に摺動自在に装着され且つ第１ピストン部材と協働して第２伸長用流体室と第２退入用流体室とを形成する第２ピストン部材と、
前記第１伸長用流体室と第１退入用流体室に夫々連通するように前記シリンダ部材に形成された第１伸長用流体通路と第１退入用流体通路と、
前記第２伸長用流体室と第２退入用流体室に夫々連通するように且つ前記第１伸長用流体通路と第１退入用流体通路とは独立に形成された第２伸長用流体通路と第２退入用流体通路とを備え、
前記第１ピストン部材のピストン部から第１伸長用流体室とシリンダ部材とを貫通してシリンダ部材外まで延びる通路形成用ロッド部を設け、
前記第２伸長用流体通路と第２退入用流体通路か゛前記第１ピストン部材と通路形成用ロッド部とに形成され、
前記シリンダ部材の端部に内嵌螺合された第１の段付き筒体を設け、
この第１の段付き筒体に前記第１ピストン部材のピストンロッド部が挿通する第１のロッド孔が形成され、
前記シリンダ部材の端壁部の中央部の開口孔に内嵌螺合された第２の段付き筒体を設け、
この第２の段付き筒体に前記通路形成用ロッド部が挿通する第２のロッド孔が形成された
ことを特徴とする複数段流体圧シリンダ。 In a multi-stage hydraulic cylinder in which a plurality of hydraulic cylinders are incorporated concentrically,
A cylinder member,
A first piston member slidably mounted in a first cylinder hole in the cylinder member and forming a first elongation fluid chamber and a first retraction fluid chamber in cooperation with the cylinder member;
A second piston member slidably mounted in a second cylinder bore in the first piston member and forming a second elongation fluid chamber and a second retraction fluid chamber in cooperation with the first piston member; When,
A first elongation fluid passage and a first evacuation fluid passage formed in the cylinder member so as to communicate with the first elongation fluid chamber and the first evacuation fluid chamber, respectively;
A second elongation fluid passage formed so as to communicate with the second elongation fluid chamber and the second evacuation fluid chamber, respectively, and independently of the first elongation fluid passage and the first evacuation fluid passage. And a second retreat fluid passage ,
A passage forming rod portion extending from the piston portion of the first piston member to the outside of the cylinder member through the first elongation fluid chamber and the cylinder member is provided,
The second elongating fluid passage and the second retreating fluid passage are formed in the first piston member and the passage forming rod portion;
Providing a first stepped cylindrical body which is screwed into the end of the cylinder member,
A first rod hole through which the piston rod portion of the first piston member is inserted is formed in the first stepped cylindrical body,
A second stepped cylinder is screwed into an opening in the center of the end wall of the cylinder member.
A multi-stage fluid pressure cylinder , wherein a second rod hole through which the passage-forming rod portion is inserted is formed in the second stepped cylindrical body .
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