JP4573565B2 - Fluid reservoir tank and fluid pressure equipment - Google Patents

Fluid reservoir tank and fluid pressure equipment Download PDF

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JP4573565B2
JP4573565B2 JP2004121177A JP2004121177A JP4573565B2 JP 4573565 B2 JP4573565 B2 JP 4573565B2 JP 2004121177 A JP2004121177 A JP 2004121177A JP 2004121177 A JP2004121177 A JP 2004121177A JP 4573565 B2 JP4573565 B2 JP 4573565B2
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bellows
fluid
pump
case
cylinder
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JP2005299902A (en
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義公 石崎
義彦 河野
雄一 樋口
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Takako Industries Inc
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Description

この発明は、流体溜めタンクおよび例えば小型油圧機器などの流体圧機器に関するものである。   The present invention relates to a fluid reservoir tank and a fluid pressure device such as a small hydraulic device.

従来のこの種の油圧機器で、ピストンの両側にロッドが延びたシリンダ装置では、ピストンの往復の各動作でシリンダ内容積の差はないが、ピストンの片側にのみロッドが延びた片ロッド付ピストンの場合、ピストンの各動作でシリンダ内容積に差が生じる。このため、ポンプとそれにより駆動されるシリンダ装置との間で流体を循環させる場合にシリンダ装置に流入しまたはシリンダ装置より排出する流体量の差を吸収する流体溜めタンクを設ける必要がある。   In this type of conventional hydraulic equipment, in the cylinder device in which the rod extends on both sides of the piston, there is no difference in the cylinder volume in each reciprocation of the piston, but the piston with a single rod in which the rod extends only on one side of the piston In this case, a difference occurs in the cylinder volume in each operation of the piston. For this reason, when fluid is circulated between the pump and the cylinder device driven by the pump, it is necessary to provide a fluid reservoir tank that absorbs the difference in the amount of fluid that flows into or out of the cylinder device.

従来の流体溜めタンクは、シリンダ内の体積差を吸収するためタンクにエアブリーザを設け、タンク内の流体量の変動に応じてタンク内のエアーを吸入・排気するようにしていた。   In the conventional fluid reservoir tank, an air breather is provided in the tank in order to absorb the volume difference in the cylinder, and the air in the tank is sucked and exhausted according to the change in the amount of fluid in the tank.

しかし、エアブリーザが必要であり、油漏れ防止のため取付方向に規制があり使用方法も限られ、さらに油の冷却が良好でないという欠点があった。   However, an air breather is necessary, there is a restriction that the mounting direction is restricted to prevent oil leakage, the usage method is limited, and the oil cooling is not good.

これに対して、タンク内に流体圧力によって膨張収縮する弾性体を設けるものが考えられた（特許文献１参照）。
特願２００３-０３６３２６（特開２００４−２４５３４０） On the other hand, what provided the elastic body which expands and shrinks with a fluid pressure in a tank was considered (refer patent document 1).
Japanese Patent Application No. 2003-036326 (Japanese Patent Application Laid-Open No. 2004-245340)

特許文献１によれば、エアブリーザが不要であり、タンクからの油漏れもないが、冷却が十分でなかった。   According to Patent Document 1, an air breather is unnecessary and there is no oil leakage from the tank, but cooling is not sufficient.

したがって、この発明の目的は、エアブリーザが不要であり、油漏れがなく、しかも冷却しやすい流体溜めタンクおよび流体圧機器を提供することである。   Accordingly, an object of the present invention is to provide a fluid reservoir tank and a fluid pressure device that do not require an air breather, have no oil leakage, and are easy to cool.

この発明の流体圧機器は、流体を吸入し加圧流体を吐出するポンプと、前記加圧流体により往復駆動可能な片ロッド付ピストンを有し前記ピストンの各動作に伴って前記ポンプに前記流体を還流させるシリンダと、前記流体を収容し流体量に応じて伸縮するベローズを用いた流体溜めタンクと、前記ポンプによって前記片ロッドが後退動作するとき前記シリンダより前記ポンプに還流する前記流体の一部を前記ベローズに流入させ、かつ前記片ロッドが進出動作するときに前記ベローズより前記ポンプに流出するように切り換える弁装置とを備え、前記流体溜めタンクは前記ベローズを収容し内部に冷却液を入れたケースを有し、前記ベローズが前記ケースの内壁面に沿って移動するものであり、前記ベローズが一方向に移動するとき前記ベローズと前記ケースの内壁面との間の隙間を塞ぎ前記ベローズにより前記冷却液を移動させ、前記ベローズが反対方向に移動するとき前記隙間に前記冷却液を通過させる逆止弁を前記ベローズの先端に設け、前記ケースは、前記ベローズが前記一方向に移動するとき前記冷却液を前記ケース外に流出させる流出口を前記逆止弁に対して前記ケースの一方側に有し、前記逆止弁に対して前記ケースの他方側に、前記流出口に接続された冷却パイプを介して前記冷却液が前記ケース内に流入可能な流入口を有する。 The fluid pressure device according to the present invention includes a pump that sucks fluid and discharges pressurized fluid, and a piston with a single rod that can be reciprocally driven by the pressurized fluid, and the fluid is supplied to the pump with each operation of the piston. A cylinder for recirculating the fluid, a fluid reservoir tank using a bellows that contains the fluid and expands and contracts according to the amount of the fluid, and one of the fluid that recirculates from the cylinder to the pump when the one rod moves backward by the pump. And a valve device for switching so as to flow out from the bellows to the pump when the one rod moves forward, and the fluid reservoir tank contains the bellows and contains cooling liquid therein. The bellows moves along the inner wall surface of the case, and the bellows moves in one direction when the bellows moves in one direction. A check valve for closing the gap between the inner wall of the case and the inner wall surface of the case to move the cooling liquid by the bellows, and allowing the cooling liquid to pass through the gap when the bellows moves in the opposite direction. The case has an outlet on one side of the case with respect to the check valve, and the case has an outlet for allowing the coolant to flow out of the case when the bellows moves in the one direction. on the other side of the case with respect to the valve, the cooling liquid through the connected cooling pipe to said outlet port has an inlet capable of inlet into the casing.

上記構成において、前記ベローズは金属製である。   The said structure WHEREIN: The said bellows is metal.

この発明の流体圧機器によれば、ベローズが伸縮することによりポンプに還流する流体量の変動を吸収することができる。この場合、ベローズの周面が伸縮のため蛇腹構造となるので表面積が増大し、流体を冷却しやすく、しかも油漏れがない。さらにベローズであるため、タンクの取付方向が規制されず、タンクの部品点数も増加せず、タンク内の精度も必要でない。また、冷却手段を設けるとより一層冷却効果が高い。 According to the fluid pressure device of the present invention, it is possible to absorb fluctuations in the amount of fluid recirculated to the pump due to expansion and contraction of the bellows. In this case, since the peripheral surface of the bellows becomes a bellows structure due to expansion and contraction, the surface area is increased, the fluid is easily cooled, and there is no oil leakage. Furthermore, because of the bellows, the mounting direction of the tank is not restricted, the number of parts of the tank is not increased, and the accuracy in the tank is not required. In addition, when the cooling means is provided, the cooling effect is further enhanced.

したがって、流体圧機器に適用した場合、冷却が良好で長時間使用に耐え、取付姿勢も規制されず、軽量かつ安価にできる。   Therefore, when applied to a fluid pressure device, the cooling is good, it can be used for a long time, the mounting posture is not restricted, and the weight can be reduced.

ベローズを金属製にすると冷却効果が高い。 Cooling effect and the bellows is made of metal is not high.

この発明の第１の実施の形態を図１から図３に示す。すなわち、この小型油圧機器は、ポンプ１と、シリンダ２と、弁装置３と、流体溜めタンク４を一体に有する。   A first embodiment of the present invention is shown in FIGS. That is, this small hydraulic device integrally includes a pump 1, a cylinder 2, a valve device 3, and a fluid reservoir tank 4.

ポンプ１は、第１ポート５および第２ポート６を有し、その一方より流体を吸入し他方より吐出するものである。ポンプ１はそれに一体に設けた正逆回転モータ４２により回転する斜板型ポンプであり、モータ４２の回転軸にポンプ軸７を連結し、モータ４２の回転方向の切り換えにより第１ポート５または第２ポート６より選択的に流体を外部に吐出する。   The pump 1 has a first port 5 and a second port 6, and sucks fluid from one of them and discharges it from the other. The pump 1 is a swash plate type pump that is rotated by a forward / reverse rotating motor 42 provided integrally therewith. The pump shaft 7 is connected to the rotating shaft of the motor 42, and the first port 5 or the first port 5 is switched by switching the rotating direction of the motor 42. The fluid is selectively discharged from the 2 port 6 to the outside.

図１ではモータ４２がポンプ軸７から見て例えば反時計回りに回転している。８はモータ４２を取付けたハウジング、９、１０はポンプ軸７の軸受け、１１はポンプ軸７の回りに一体に設けられた複数のシリンダ、１２はシリンダ１１群に内挿されたピストンで、シリンダ１１の一端からばねにより突出するように付勢されている。１３はピストン１２の先端が摺接する斜板であり、ポンプ軸７を貫通させる貫通孔を有し、一周縁部でポンプ軸７と直角な軸１８に軸支され、斜板１３の直径方向の軸１８と反対側が弾性体５７により付勢され、これにより斜板１３がポンプ軸７に略垂直な姿勢から所定の角度に傾斜した姿勢まで回動可能にしている。各シリンダ１１と第１ポート５または第２ポート６は、ポンプ軸７の一回転において、ピストン１２が斜板１３を昇るときのシリンダ１１群と、ピストン１２が斜板１３を下るときのシリンダ１１群にそれぞれ連通する弁板１９の一対の連通溝を介して連通している。図１の場合は、モータ４２の回転方向が反時計回りのため第１ポート５が加圧流体の吐出側となり、第２ポート６が流体の吸入側となる。モータ４２の回転方向が時計回りの場合はその反対となる。   In FIG. 1, the motor 42 rotates, for example, counterclockwise when viewed from the pump shaft 7. 8 is a housing to which a motor 42 is attached, 9 and 10 are bearings for the pump shaft 7, 11 is a plurality of cylinders integrally provided around the pump shaft 7, and 12 is a piston inserted into the cylinder 11 group. It is urged | biased so that it may protrude from the end of 11 with a spring. Reference numeral 13 denotes a swash plate with which the tip of the piston 12 is slidably contacted. The swash plate 13 has a through-hole through which the pump shaft 7 penetrates. The side opposite to the shaft 18 is urged by the elastic body 57, so that the swash plate 13 can rotate from a posture substantially perpendicular to the pump shaft 7 to a posture inclined at a predetermined angle. Each cylinder 11 and the first port 5 or the second port 6 include a cylinder 11 group when the piston 12 ascends the swash plate 13 and a cylinder 11 when the piston 12 descends the swash plate 13 in one rotation of the pump shaft 7. The valve plates 19 communicate with the groups through a pair of communication grooves. In the case of FIG. 1, since the rotation direction of the motor 42 is counterclockwise, the first port 5 is a pressurized fluid discharge side, and the second port 6 is a fluid suction side. The opposite is true when the rotation direction of the motor 42 is clockwise.

シリンダ２は、ポンプ１より圧送される加圧流体によりピストンを往復動作するものであり、片ロッド２２の付いたピストン２３を有し、ピストン２３を摺動自在に内挿したシリンダ部２４を有し、片ロッド２２の先端部がシリンダ部２４より外部に突出している。シリンダ部２４はピストン２３により片ロッド２２のあるシリンダ室２９と片ロッド２２のないシリンダ室３０に分けられる。シリンダ室２９は通路２５を通して第１ポート５に接続され、シリンダ室３０は通路２６を通して第２ポート６に接続され、シリンダ室２９、３０の流体の圧力差によりピストン２３がいずか一方に駆動される。 The cylinder 2 reciprocates the piston with the pressurized fluid pumped from the pump 1, has a piston 23 with a single rod 22, and has a cylinder portion 24 in which the piston 23 is slidably inserted. In addition, the distal end portion of the single rod 22 protrudes from the cylinder portion 24 to the outside. The cylinder portion 24 is divided by the piston 23 into a cylinder chamber 29 having a single rod 22 and a cylinder chamber 30 having no single rod 22. The cylinder chamber 29 is connected to the first port 5 through the passage 25, the cylinder chamber 30 is connected to the second port 6 through the passage 26, and the piston 23 is driven to one of them by the pressure difference between the fluid in the cylinder chambers 29 and 30. The

タンク４は、流体を収容する流体溜めタンクであって、ピストン２３の動作によりシリンダ２からポンプ１に還流する流体の一部を収容し、流体の量の変動を吸収するベローズ４０を有する。ベローズ４０は胴部が流体の圧力により軸方向に伸縮する蛇腹構造であり、例えば金属、合成樹脂およびゴム等により製造されている。ベローズ４０の軸方向の一端をハウジング８に設けた接続口４５に連結し、他端には流体注入口４７を設け栓４６により閉じている。タンク４はベローズ４０に被せるように、ケース４８をハウジング８に着脱可能に取付けている。またベローズ４０の伸縮方向の先端とこれに対向するケース４８の内面との間にばね４９を介在し、ベローズ４０を収縮する方向に付勢するとともにケース４８に通気孔５０を形成している。接続口４５は通路３３に連通し弁装置３を介して通路２５、２６と連通する。   The tank 4 is a fluid reservoir tank that contains a fluid, and has a bellows 40 that accommodates a part of the fluid that is returned from the cylinder 2 to the pump 1 by the operation of the piston 23 and absorbs fluctuations in the amount of fluid. The bellows 40 has a bellows structure in which a body portion expands and contracts in the axial direction by a fluid pressure, and is manufactured from, for example, metal, synthetic resin, rubber, or the like. One end of the bellows 40 in the axial direction is connected to a connection port 45 provided in the housing 8, and a fluid injection port 47 is provided at the other end and is closed by a plug 46. A case 48 is detachably attached to the housing 8 so that the tank 4 covers the bellows 40. In addition, a spring 49 is interposed between the distal end of the bellows 40 in the expansion / contraction direction and the inner surface of the case 48 facing the bellows 40 to urge the bellows 40 in a contracting direction and to form a vent hole 50 in the case 48. The connection port 45 communicates with the passage 33 and communicates with the passages 25 and 26 via the valve device 3.

弁装置３は、通路２５と通路３３との間に介在された第１の弁３２と、通路２６と通路３３との間に介在された第２の弁３４とを有し、弁３２、３４が相互に連結部３６により連結されている。弁装置３の第１の弁３２および第２の弁３４はパイロットリリースバルブを用い、弁装置３はポンプ１のハウジング８に一体に取付けたマニホールド５１に設けられている。通路２５または通路２６の流体が加圧流体であるときその圧力により第１の弁３２または第２の弁３４が閉弁し、その閉弁動作で連結部３６に押されて他方が開弁する。   The valve device 3 includes a first valve 32 interposed between the passage 25 and the passage 33 and a second valve 34 interposed between the passage 26 and the passage 33. Are connected to each other by a connecting portion 36. The first valve 32 and the second valve 34 of the valve device 3 use pilot release valves, and the valve device 3 is provided in a manifold 51 that is integrally attached to the housing 8 of the pump 1. When the fluid in the passage 25 or the passage 26 is a pressurized fluid, the first valve 32 or the second valve 34 is closed by the pressure, and the other valve is opened by being pushed by the connecting portion 36 by the valve closing operation. .

動作について、説明する。図１は、シリンダ２の片ロッド２２が後退動作すなわち引く方向に負荷がかけられピストン２３が移動を完了した状態であり、モータ４２に連結されたポンプ軸７は反時計回りに回転し、ポンプ２は流体を第２ポート６から吸い込み第１ポート５へ吐出し、第１ポート５に発生した流体圧により、第１の弁３２を閉じ上記のように強制的に第２の弁３４を開く。この弁装置３の動作により、通路２５と通路３３が遮断され、通路２６と通路３３が連通し、ハウジング８内およびベローズ４０内が第２ポート６およびシリンダ２の反負荷側となるシリンダ室３０と連通する。このため、第１ポート５より吐出された流体はシリンダ室２９に流入してピストン２３の背後に圧力を加え、シリンダ２のピストン２３に負荷を加える。   The operation will be described. FIG. 1 shows a state in which one rod 22 of the cylinder 2 is retracted, that is, a load is applied in the pulling direction, and the piston 23 has finished moving, and the pump shaft 7 connected to the motor 42 rotates counterclockwise. 2 sucks fluid from the second port 6 and discharges it to the first port 5, and the fluid pressure generated at the first port 5 closes the first valve 32 and forcibly opens the second valve 34 as described above. . By the operation of the valve device 3, the passage 25 and the passage 33 are blocked, the passage 26 and the passage 33 communicate with each other, and the cylinder chamber 30 in which the inside of the housing 8 and the inside of the bellows 40 are on the non-load side of the second port 6 and the cylinder 2. Communicate with. For this reason, the fluid discharged from the first port 5 flows into the cylinder chamber 29, applies pressure behind the piston 23, and applies a load to the piston 23 of the cylinder 2.

一方、シリンダ室３０に存在した流体がポンプ１に還流するとともにその一部がベローズ４０に流れ込みベローズ４０はばね４９に抗して伸長する。片口ッドタイプのシリンダ２においては引き側（シリンダ室２９）と押し側（シリンダ室３０）の体積を比較すると体積差（押し側＞引き側）がある。この体積差を吸収するため、ベローズ４０に余剰の流体が流れ込み、ベローズ４０はばね４９に抗して伸長している。図１ではピストン２３はシリンダ室３０がほとんど０に近くなる状態まで移動し停止しているが、モータ４２は回転を続けており、このとき流体の圧力の上昇で斜板１３が傾斜姿勢から弾性体５７に抗してポンプ軸７にほぼ垂直な姿勢に回動することによりピストン２３に対する駆動力を保持している。   On the other hand, the fluid existing in the cylinder chamber 30 returns to the pump 1 and a part thereof flows into the bellows 40, and the bellows 40 extends against the spring 49. In the single-ended cylinder 2, there is a volume difference (push side> pull side) when the volumes of the pull side (cylinder chamber 29) and the push side (cylinder chamber 30) are compared. In order to absorb this volume difference, excess fluid flows into the bellows 40, and the bellows 40 extends against the spring 49. In FIG. 1, the piston 23 has moved and stopped until the cylinder chamber 30 is almost close to 0, but the motor 42 continues to rotate. The driving force for the piston 23 is maintained by rotating the body 57 in a posture substantially perpendicular to the pump shaft 7 against the body 57.

図３は、図１と正反対の動作であり、シリンダ２の片ロッド２２が進出方向となる押し方向に負荷をかけてピストン２３の移動を完了した状態であるが、モータ４２はポンプ軸７を時計回りに回転させている。このため、ポンプ１は流体を第１ポート５から吸い込み第２ポート６へ吐出し、第２ポート６に発生した流体圧により第２の弁３４を閉じ強制的に第１の弁３２が開く。この弁装置３の動作により、ハウジング８内およびベローズ４０内が第１ポート５およびシリンダ２の反負荷側となるシリンダ室２９と連通し、シリンダ室３０に加圧流体が流入することによりピストン２３が進出移動し、シリンダ室２９に存した流体がピストン２３の移動の過程で第１ポート５よりポンプ１内に吸入され、シリンダ室３０との体積差により足らなくなった流体はベローズ４０より流れ込み、ベローズ４０は収縮する。このときベローズ４０に加わるばね４９のばね力により管路内が負圧になることが防止される。図３ではピストン２３はシリンダ室２９がほとんど０ちかくなる状態まで移動し停止しているが、モータ４２は時計方向の回転を続けており、このとき流体の圧力の上昇で斜板１３が図３に示すようにポンプ軸７にほぼ垂直姿勢になることによりピストン２３に対する駆動力を保持している。   FIG. 3 shows the operation opposite to that in FIG. 1 and shows a state in which the movement of the piston 23 is completed by applying a load in the pushing direction in which the single rod 22 of the cylinder 2 moves forward. It is rotating clockwise. For this reason, the pump 1 sucks fluid from the first port 5 and discharges it to the second port 6. The fluid pressure generated at the second port 6 closes the second valve 34 and forcibly opens the first valve 32. By the operation of the valve device 3, the inside of the housing 8 and the inside of the bellows 40 communicate with the first chamber 5 and the cylinder chamber 29 on the anti-load side of the cylinder 2, and the pressurized fluid flows into the cylinder chamber 30, thereby causing the piston 23. And the fluid existing in the cylinder chamber 29 is sucked into the pump 1 from the first port 5 in the course of the movement of the piston 23, and the fluid that has become insufficient due to the volume difference from the cylinder chamber 30 flows into the bellows 40. The bellows 40 contracts. At this time, the inside of the pipe is prevented from becoming negative pressure by the spring force of the spring 49 applied to the bellows 40. In FIG. 3, the piston 23 has moved and stopped until the cylinder chamber 29 becomes almost zero, but the motor 42 continues to rotate in the clockwise direction. As shown in FIG. 2, the driving force for the piston 23 is maintained by being substantially perpendicular to the pump shaft 7.

図２は、片ロッド２２が押し方向に進んでいる途中の行程を示し、シリンダ２のピストン３はシリンダ部２４の中間点を移動し、片ロッド分の体積差のためベローズ４０も縮む方向に移動している。またポンプ１の斜板１３は図１のポンプ軸７にほぼ垂直な姿勢から例えば４５度に近い角度に傾斜しており、第２ポート６よりシリンダ室３０に加圧流体を供給し、片ロッド２２を外部へ押し出している。   FIG. 2 shows a process in which the single rod 22 is moving in the pushing direction. The piston 3 of the cylinder 2 moves in the middle point of the cylinder portion 24, and the bellows 40 also contracts due to the volume difference of the single rod. Has moved. Further, the swash plate 13 of the pump 1 is inclined at an angle close to, for example, 45 degrees from a posture substantially perpendicular to the pump shaft 7 in FIG. 1, and pressurized fluid is supplied from the second port 6 to the cylinder chamber 30, 22 is pushed out.

実施の形態によれば、ベローズ４０の伸縮によりシリンダ室２９、３０の体積差を吸収するため、タンク４はエアブリーザが不要でノンリークが可能となる。またベローズ４０の蛇腹構造により表面積が大きくなるので、加圧により温度上昇した流体を冷却し温度を下げることができる。またベローズ４０の伸縮動作に伴ってケース４８内の容積が変化しそれに伴って外部と通気孔５０を通して空気が出入りするので、自然空冷を促進する。   According to the embodiment, since the volume difference between the cylinder chambers 29 and 30 is absorbed by the expansion and contraction of the bellows 40, the tank 4 does not require an air breather and can be non-leakable. Further, since the surface area is increased by the bellows structure of the bellows 40, the fluid whose temperature has been increased by pressurization can be cooled and the temperature can be decreased. Further, as the bellows 40 expands and contracts, the volume in the case 48 changes, and accordingly, air enters and exits through the outside and the vent hole 50, thereby promoting natural air cooling.

タンク４内にばね４９を設けてベローズ４０を収縮する方向に付勢し、あるいはベローズ４０自体を収縮する方向に復元作用を付与することにより、ポンプ１およびシリンダ２につながる管路内が負圧になることを防止することができる。   A spring 49 is provided in the tank 4 to urge the bellows 40 in a contracting direction, or by applying a restoring action in a contracting direction of the bellows 40 itself, a negative pressure is generated in the pipe line connected to the pump 1 and the cylinder 2. Can be prevented.

この発明の第２の実施の形態を図４に示す。すなわち、第２の実施の形態は第１の実施の形態において、冷却手段としてケース４８の先端にファン装置５５を設け、ベローズを強制空冷する。ファン装置５５の動力はモータを用いるが、モータ４２の動力を利用してもよい。   A second embodiment of the present invention is shown in FIG. That is, in the second embodiment, the fan device 55 is provided at the tip of the case 48 as a cooling means in the first embodiment, and the bellows is forcibly air-cooled. The motor of the fan device 55 uses a motor, but the power of the motor 42 may be used.

この発明の第３の実施の形態を図５に示す。すなわち、第３の実施の形態は第１の実施の形態のケースに変えて、冷却手段として、水などの冷却液を入れたケース４８′内にベローズ４０を収納してベローズ４０を液冷するもので、ケース４８′に流入口６０と流出口６１とを設けている。冷却液は送液ポンプ（図示せず）から供給され、ケース４８′との間で冷却液を循環させる。なおケース４８′から送液ポンプにつながる外部経路に熱交換器等を設けて冷却液を冷却してもよい。   A third embodiment of the present invention is shown in FIG. That is, in the third embodiment, instead of the case of the first embodiment, the bellows 40 is housed in a case 48 'containing a coolant such as water as a cooling means, and the bellows 40 is liquid cooled. The case 48 ′ is provided with an inlet 60 and an outlet 61. The cooling liquid is supplied from a liquid feed pump (not shown) and circulates the cooling liquid between the case 48 '. It should be noted that a heat exchanger or the like may be provided in an external path leading from the case 48 'to the liquid feed pump to cool the coolant.

この発明の第４の実施の形態を図６に示す。すなわち、第３の実施の形態において、流入口６０と流出口６１を冷却パイプ６２でつなぎ、ベローズ４０の先端に逆止弁６３を設けている。したがって、ベローズ４０が伸長するときは逆止弁６３とケース内壁面との間の隙間を液体６５が流れることができるが、ベローズ４０が収縮するときは逆止弁６３がケース４８′の内壁面を摺接して冷却液６５を矢印の方向に押し、これにより冷却液６５が流出口６１より冷却パイプ６２を流れて流入口６０に循環する。この場合、冷却パイプ６２にフィンその他の熱交換器を設けると冷却効果が高い。また逆止弁６３の向きを逆にして、ベローズ４０か伸長するとき冷却液６５を押し矢印と反対向きに循環させることができる。   A fourth embodiment of the present invention is shown in FIG. That is, in the third embodiment, the inlet 60 and the outlet 61 are connected by the cooling pipe 62, and the check valve 63 is provided at the tip of the bellows 40. Therefore, when the bellows 40 is extended, the liquid 65 can flow through the gap between the check valve 63 and the inner wall surface of the case. However, when the bellows 40 is contracted, the check valve 63 is connected to the inner wall surface of the case 48 '. And the coolant 65 is pushed in the direction of the arrow, so that the coolant 65 flows from the outlet 61 through the cooling pipe 62 and circulates to the inlet 60. In this case, if the cooling pipe 62 is provided with fins or other heat exchangers, the cooling effect is high. Further, the direction of the check valve 63 is reversed, and the cooling liquid 65 can be circulated in the direction opposite to the arrow when the bellows 40 extends.

なお、この発明において、ベローズ４０は収縮方向に復元作用を有するものにしてもよく、その場合ばね４９を省略してもよい。   In the present invention, the bellows 40 may have a restoring action in the contraction direction, and in that case, the spring 49 may be omitted.

（ａ）は本発明の第１の実施の形態の片ロッドの後退状態の断面図、（ｂ）はそのときの弁装置の断面図である。(A) is sectional drawing of the retraction state of the single rod of the 1st Embodiment of this invention, (b) is sectional drawing of the valve apparatus at that time. （ａ）は片ロッドの進出途中の状態の断面図、（ｂ）はそのときの弁装置の断面図である。(A) is sectional drawing of the state in the middle of advancement of a single rod, (b) is sectional drawing of the valve apparatus at that time. （ａ）は片ロッドの進出状態の断面図、（ｂ）はそのときの弁装置の断面図である。(A) is sectional drawing of the advancing state of a single rod, (b) is sectional drawing of the valve apparatus at that time. 第２の実施の形態のタンク部分の断面図である。It is sectional drawing of the tank part of 2nd Embodiment. 第３の実施の形態のタンク部分の断面図である。It is sectional drawing of the tank part of 3rd Embodiment. 第４の実施の形態のタンク部分の断面図である。It is sectional drawing of the tank part of 4th Embodiment.

符号の説明Explanation of symbols

１ ポンプ
２ シリンダ
３ 弁装置
４ タンク
５ 第１ポート
６ 第２ポート
７ ポンプ軸
１３ 斜板
２２ 片ロッド
２３ ピストン
２４ シリンダ部
２５ 通路
２６ 通路
２９ シリンダ室
３０ シリンダ室
３２ 第１の弁
３３ 通路
３４ 第２の弁
４０ ベローズ
４５ 接続口
４８ ケース
４８′ ケース
５０ 通気孔
５５ ファン装置
６５ 冷却液 DESCRIPTION OF SYMBOLS 1 Pump 2 Cylinder 3 Valve apparatus 4 Tank 5 1st port 6 2nd port 7 Pump shaft 13 Swash plate 22 Single rod 23 Piston 24 Cylinder part 25 Passage 26 Passage 29 Cylinder chamber 30 Cylinder chamber 30 Cylinder chamber 32 First valve 33 Passage 34 First 2 valve 40 bellows 45 connection port 48 case 48 'case 50 vent hole 55 fan device 65 coolant

Claims (2)

流体を吸入し加圧流体を吐出するポンプと、前記加圧流体により往復駆動可能な片ロッド付ピストンを有し前記ピストンの各動作に伴って前記ポンプに前記流体を還流させるシリンダと、前記流体を収容し流体量に応じて伸縮するベローズを用いた流体溜めタンクと、前記ポンプによって前記片ロッドが後退動作するとき前記シリンダより前記ポンプに還流する前記流体の一部を前記ベローズに流入させ、かつ前記片ロッドが進出動作するときに前記ベローズより前記ポンプに流出するように切り換える弁装置とを備え、前記流体溜めタンクは前記ベローズを収容し内部に冷却液を入れたケースを有し、前記ベローズが前記ケースの内壁面に沿って移動するものであり、前記ベローズが一方向に移動するとき前記ベローズと前記ケースの内壁面との間の隙間を塞ぎ前記ベローズにより前記冷却液を移動させ、前記ベローズが反対方向に移動するとき前記隙間に前記冷却液を通過させる逆止弁を前記ベローズの先端に設け、前記ケースは、前記ベローズが前記一方向に移動するとき前記冷却液を前記ケース外に流出させる流出口を前記逆止弁に対して前記ケースの一方側に有し、前記逆止弁に対して前記ケースの他方側に、前記流出口に接続された冷却パイプを介して前記冷却液が前記ケース内に流入可能な流入口を有する流体圧機器。 A pump that sucks fluid and discharges pressurized fluid, a cylinder having a single-rod piston that can be reciprocally driven by the pressurized fluid, and causes the pump to recirculate to the pump with each operation of the piston; And a fluid reservoir tank using a bellows that expands and contracts according to the amount of fluid, and a part of the fluid recirculated from the cylinder to the pump when the one rod moves backward by the pump, flows into the bellows, And a valve device for switching so as to flow out from the bellows to the pump when the one rod is advanced, the fluid reservoir tank has a case containing the bellows and containing a coolant therein, The bellows moves along the inner wall surface of the case, and when the bellows moves in one direction, the bellows and the inner wall of the case A check valve is provided at the tip of the bellows to allow the coolant to move by the bellows, and to pass the coolant through the gap when the bellows moves in the opposite direction. The bellows has an outlet on one side of the case with respect to the check valve that allows the coolant to flow out of the case when the bellows moves in the one direction, and the other side of the case with respect to the check valve. A fluid pressure device having an inlet on the side through which the coolant can flow into the case via a cooling pipe connected to the outlet . 前記ベローズは金属製である請求項１記載の流体圧機器。 The fluid pressure device according to claim 1, wherein the bellows is made of metal .
JP2004121177A 2004-04-16 2004-04-16 Fluid reservoir tank and fluid pressure equipment Expired - Fee Related JP4573565B2 (en)

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ITCO20110033A1 (en) 2011-08-25 2013-02-26 Nuovo Pignone Spa INTEGRATED HEAT EXCHANGER WITH PRESSURE COMPENSATION AND METHOD
TW201727052A (en) 2015-09-25 2017-08-01 Mitsubishi Heavy Ind Ltd Hydraulic oil tank for power generation system and method for sealing hydraulic oil in said hydraulic oil tank

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JPS508389U (en) * 1973-05-09 1975-01-28
JPS507413Y1 (en) * 1970-06-13 1975-03-04
JPS60103228U (en) * 1983-12-15 1985-07-13 昭和電線電纜株式会社 Oil amount control device for bellows type oil tank
JPS62102001U (en) * 1985-12-18 1987-06-29
JPH0285003U (en) * 1988-12-22 1990-07-03
JPH02119501U (en) * 1989-03-14 1990-09-26
JP2001349302A (en) * 2000-06-02 2001-12-21 Kayaba Ind Co Ltd Hydraulic power package
JP2004245340A (en) * 2003-02-14 2004-09-02 Takako:Kk Cylinder device with fluid storage tank and pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS507413Y1 (en) * 1970-06-13 1975-03-04
JPS508389U (en) * 1973-05-09 1975-01-28
JPS60103228U (en) * 1983-12-15 1985-07-13 昭和電線電纜株式会社 Oil amount control device for bellows type oil tank
JPS62102001U (en) * 1985-12-18 1987-06-29
JPH0285003U (en) * 1988-12-22 1990-07-03
JPH02119501U (en) * 1989-03-14 1990-09-26
JP2001349302A (en) * 2000-06-02 2001-12-21 Kayaba Ind Co Ltd Hydraulic power package
JP2004245340A (en) * 2003-02-14 2004-09-02 Takako:Kk Cylinder device with fluid storage tank and pump

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