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JP4431435B2 - Hydraulic drive - Google Patents
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JP4431435B2 - Hydraulic drive - Google Patents

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JP4431435B2
JP4431435B2 JP2004123879A JP2004123879A JP4431435B2 JP 4431435 B2 JP4431435 B2 JP 4431435B2 JP 2004123879 A JP2004123879 A JP 2004123879A JP 2004123879 A JP2004123879 A JP 2004123879A JP 4431435 B2 JP4431435 B2 JP 4431435B2
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hydraulic
oil
closed circuit
flow path
hydraulic actuator
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JP2005308045A (en
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光晴 中沢
勝利 藤倉
晋也 山本
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Ｔｃｍ株式会社
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Description

本発明は、油圧駆動装置に関するものである。 The present invention relates to a hydraulic drive device.

油圧ポンプと、油圧シリンダや油圧モータ等のアクチュエータと、を有する閉回路を備えた油圧駆動装置において、従来、油圧アクチュエータの作動中に、油圧ポンプからの送り側流路と油圧ポンプへの戻り側流路との間に生じた差圧により、バルブ（フラッシングバルブ）を開状態として作動油を閉回路内からタンクへ流し、閉回路内の油を入れ換え、油温及び閉回路の温度を下げるものがある（例えば、特許文献１参照）。
特開２００２−２２７９９８号公報 In a hydraulic drive device having a closed circuit having a hydraulic pump and an actuator such as a hydraulic cylinder and a hydraulic motor, conventionally, during operation of the hydraulic actuator, a feed-side flow path from the hydraulic pump and a return side to the hydraulic pump A valve (flushing valve) is opened by the differential pressure generated between the flow path and hydraulic oil flows from the closed circuit to the tank, the oil in the closed circuit is replaced, and the oil temperature and the closed circuit temperature are lowered. (For example, refer to Patent Document 1).
JP 2002-227998 A

従来の油圧駆動装置は、油圧アクチュエータの停止中は、送り側流路と戻り側流路との間に差圧が生じないため、上記バルブは閉状態となり、閉回路内において作動油の入れ換えが行われず、効率よく油温、回路内の温度を下げることができないという問題点がある。つまり、従来は、油圧アクチュエータが作動中にのみ閉回路内の作動油を交換して回路内の油温を下げている。   In the conventional hydraulic drive device, when the hydraulic actuator is stopped, no differential pressure is generated between the feed-side flow path and the return-side flow path. Therefore, the valve is closed, and the hydraulic oil can be replaced in the closed circuit. There is a problem that the oil temperature and the temperature in the circuit cannot be lowered efficiently. In other words, conventionally, the hydraulic oil in the closed circuit is changed only when the hydraulic actuator is in operation to lower the oil temperature in the circuit.

本発明に係る油圧駆動装置は、油圧ポンプに一対の流路を介して油圧アクチュエータを接続させた閉回路と、上記閉回路へ作動油を補給するチャージポンプと、上記油圧アクチュエータの作動により生じた上記一対の流路の差圧により開状態となって上記閉回路から作動油をタンクへ還流させる排油バルブと、上記油圧アクチュエータの停止の際に上記閉回路と上記タンクとの間において連通状態となり上記チャージポンプにて作動油を上記閉回路から上記タンクへ流す排油流路と、を備えたものである。
また、上記排油流路は、上記油圧アクチュエータの近傍位置にて上記閉回路と接続されている。
また、上記チャージポンプは、作動油をリリーフ可能とさせる第１リリーフバルブと接続され、かつ、上記排油流路は、上記閉回路側から順に、上記油圧アクチュエータの停止の際に開状態となるソレノイドバルブと、上記第１リリーフバルブのリリーフ圧より小さいリリーフ圧に設定された第２リリーフバルブと、を有するものである。 Hydraulic drive system according to the present invention, a closed circuit is connected to the hydraulic actuator through a pair of flow paths to the hydraulic pump, a charge pump for replenishing the hydraulic fluid to the closed circuit, caused by the operation of the hydraulic actuator communicating state in between the oil discharge valve to be returned to the tank hydraulic oil from the closed circuit in the open state by pressure difference between the pair of flow paths, and the closed circuit and the tank during the stop of the hydraulic actuator the hydraulic oil in next the charge pump is obtained and an oil discharge passage to flow into the tank from the closed circuit.
Further, the oil drain passage is connected to the closed circuit at a position near the hydraulic actuator.
The charge pump is connected to a first relief valve that allows hydraulic oil to be relieved, and the drainage flow path is opened from the closed circuit side when the hydraulic actuator is stopped. A solenoid valve; and a second relief valve set to a relief pressure lower than the relief pressure of the first relief valve.

本発明の油圧駆動装置によれば、油圧アクチュエータが作動中及び停止中のいずれの場合においても閉回路内の作動油を入れ換えることができ、効率よく閉回路及び作動油を冷却することができる。
排油流路を、油圧アクチュエータの近傍位置にて接続させることで、閉回路全体にわたって作動油の入れ換えが可能となり、また、油圧アクチュエータにて発生した熱により上昇した温度も迅速に低下させることができる。 According to the hydraulic drive device of the present invention, the hydraulic oil in the closed circuit can be replaced regardless of whether the hydraulic actuator is operating or stopped, and the closed circuit and the hydraulic oil can be efficiently cooled.
By connecting the oil drainage channel in the vicinity of the hydraulic actuator, it is possible to replace the hydraulic oil over the entire closed circuit, and the temperature raised by the heat generated by the hydraulic actuator can be quickly reduced. it can.

図１は、本発明に係る油圧駆動装置の実施の一形態を示す概略構成図であり、この油圧駆動装置（の油圧回路部）は、油圧ポンプ10と油圧アクチュエータＭとを有する閉回路Ｃと、閉回路Ｃへ作動油を補給するチャージポンプ３と、油圧アクチュエータＭの作動（運転）に伴って閉回路Ｃから作動油をタンク１へ還流させる排油バルブ２と、油圧アクチュエータＭの停止の際に作動油を閉回路Ｃからタンク１へ流す（還流させる）排油流路４と、を備えている。   FIG. 1 is a schematic configuration diagram showing an embodiment of a hydraulic drive device according to the present invention. This hydraulic drive device (hydraulic circuit portion thereof) includes a closed circuit C having a hydraulic pump 10 and a hydraulic actuator M. , A charge pump 3 for supplying hydraulic oil to the closed circuit C, an oil discharge valve 2 for returning the hydraulic oil from the closed circuit C to the tank 1 when the hydraulic actuator M is operated (operation), and a stop of the hydraulic actuator M. In this case, there is provided an oil drain passage 4 for flowing (recirculating) the hydraulic oil from the closed circuit C to the tank 1.

閉回路Ｃは、油圧ポンプ10に一対の流路Ａ，Ｂを介して油圧アクチュエータＭを接続させた構成であり、図１に示すように、一対の流路Ａ，Ｂの内の一方を第１流路Ａ、他方を第２流路Ｂとする。油圧ポンプ10が作動して第１流路Ａ側を作動油の送り側流路とし、油圧アクチュエータＭを介して、第２流路Ｂ側を戻り側流路とすることで、油圧アクチュエータＭを作動させ、例えば、油圧アクチュエータＭを油圧シリンダ（図示省略）とすれば、油圧シリンダが短縮するよう構成されている。反対に、第２流路Ｂ側を送り側流路とし、油圧アクチュエータＭを介して、第１流路Ａ側を戻り側流路とすることで、油圧シリンダ（油圧アクチュエータＭ）を作動させ、油圧シリンダが伸長する。   The closed circuit C has a configuration in which a hydraulic actuator M is connected to the hydraulic pump 10 through a pair of flow paths A and B. As shown in FIG. 1, one of the pair of flow paths A and B is the first. One channel A and the other channel are second channels B. When the hydraulic pump 10 is operated, the first flow path A side is set as the hydraulic oil feed side flow path, and the second flow path B side is set as the return side flow path via the hydraulic actuator M. For example, if the hydraulic actuator M is a hydraulic cylinder (not shown), the hydraulic cylinder is shortened. On the other hand, the hydraulic cylinder (hydraulic actuator M) is operated by setting the second flow path B side as a feed-side flow path and the first flow path A side as a return-side flow path via the hydraulic actuator M, The hydraulic cylinder extends.

油圧ポンプ10は、可変容量形とされており、油圧ポンプ10の２つのポートの夫々に第１流路Ａの一端側と第２流路Ｂの一端側とが（並列状に）接続され、これらの他端側が油圧アクチュエータＭの２つのポートに夫々接続される。油圧ポンプ10は、図示省略のモータ等の駆動源と接続されて第１流路Ａ側を送り側流路とするよう、又は、第２流路Ｂ側を送り側流路とするよう、又は、停止状態となるよう切換自在とされている。   The hydraulic pump 10 is of a variable displacement type, and one end side of the first flow path A and one end side of the second flow path B are connected to each of the two ports of the hydraulic pump 10 (in parallel). These other end sides are connected to two ports of the hydraulic actuator M, respectively. The hydraulic pump 10 is connected to a drive source such as a motor (not shown) so that the first flow path A side is a feed side flow path, or the second flow path B side is a feed side flow path, or It is possible to switch to be in a stop state.

油圧アクチュエータＭは、図１のように油圧モータや、図示省略するが油圧シリンダ等とすることができ、第１流路Ａの他端側と第２流路Ｂの他端側とが油圧アクチュエータＭの２つのポートに夫々接続される。これにより、油圧ポンプ10と油圧アクチュエータＭとを含む閉回路Ｃが構成される。   The hydraulic actuator M can be a hydraulic motor as shown in FIG. 1 or a hydraulic cylinder (not shown), and the other end side of the first flow path A and the other end side of the second flow path B are hydraulic actuators. M is connected to each of the two ports. Thus, a closed circuit C including the hydraulic pump 10 and the hydraulic actuator M is configured.

チャージポンプ３は、タンク１から作動油を閉回路Ｃ内へ補給（供給）するためのものであり、油圧アクチュエータＭの作動の際は、油圧ポンプ10とチャージポンプ３の両者から供給された作動油の一部が、閉回路Ｃ内から（後に説明する）排油バルブ２を通過してタンク１へ流れる。これにより、油圧アクチュエータＭの作動中において、作動油を閉回路Ｃとタンク１との間を循環させ、閉回路Ｃの温度及び作動油の温度を下げている。   The charge pump 3 is for replenishing (supplying) hydraulic oil from the tank 1 into the closed circuit C. When the hydraulic actuator M is operated, the operation is supplied from both the hydraulic pump 10 and the charge pump 3. Part of the oil flows from the closed circuit C to the tank 1 through the oil discharge valve 2 (described later). Thus, during the operation of the hydraulic actuator M, the hydraulic oil is circulated between the closed circuit C and the tank 1 to reduce the temperature of the closed circuit C and the temperature of the hydraulic oil.

チャージポンプ３の吐出側流路は十字路となる第１分岐部11から分岐して、夫々、第１リリーフバルブ５、第１チェックバルブ16、第２チェックバルブ17が接続されている。第１リリーフバルブ５はその下流側においてタンク１と接続され、設定圧（リリーフ圧ｐ1 ）を越えた作動油がタンク１へ排出される。第１チェックバルブ16は、第１流路Ａ側と接続されてチャージポンプ３から第１流路Ａへ作動油を通過可能とさせるものであり、また、第２チェックバルブ17は、第２流路Ｂ側と接続されてチャージポンプ３から第２流路Ｂへ作動油を通過可能とさせる。 The discharge-side flow path of the charge pump 3 branches from the first branch portion 11 that is a cross road, and the first relief valve 5, the first check valve 16, and the second check valve 17 are connected to each other. The first relief valve 5 is connected to the tank 1 on the downstream side thereof, and hydraulic oil exceeding the set pressure (relief pressure p 1 ) is discharged to the tank 1. The first check valve 16 is connected to the first flow path A side and allows hydraulic oil to pass from the charge pump 3 to the first flow path A. The second check valve 17 is connected to the second flow path A. It is connected to the path B side so that the hydraulic oil can pass from the charge pump 3 to the second flow path B.

排油バルブ２（フラッシングバルブ）は、油圧アクチュエータＭの作動により生じた一対の流路Ａ，Ｂの差圧により、図２に示すように、開状態となって閉回路Ｃから作動油をタンク１へ還流させる。つまり、排油バルブ２は、油圧アクチュエータＭが作動して第１流路Ａと第２流路Ｂとの間に生じる差圧に応じて開閉切り換わるよう構成され、所定の差圧が生じれば閉状態から開状態となる。しかも、一対の流路Ａ，Ｂのうちの低圧側の流路とタンク１側の流路とが連通状態となるよう切り換わるものであり、常に低圧側の流路から作動油をタンク１へ排油するよう構成されている。   As shown in FIG. 2, the oil drain valve 2 (flushing valve) is opened due to the differential pressure between the pair of flow paths A and B generated by the operation of the hydraulic actuator M, and tanks the hydraulic oil from the closed circuit C. Reflux to 1. That is, the oil discharge valve 2 is configured to open and close according to the differential pressure generated between the first flow path A and the second flow path B when the hydraulic actuator M is operated, and a predetermined differential pressure is generated. From the closed state to the open state. Moreover, the low pressure side flow path and the tank 1 side flow path of the pair of flow paths A and B are switched so as to be in communication with each other, and hydraulic oil is always supplied from the low pressure side flow path to the tank 1. It is configured to drain oil.

排油バルブ２は、第１流路Ａ側の第４分岐部14から分岐した流路と、第２流路Ｂ側の第５分岐部15から分岐した流路とに接続され、さらに、タンク１へと続く流路と接続され、第１流路Ａ又は第２流路Ｂと、タンク１側との間を連通・非連通切換自在とする。
そして、図２のように、第１流路Ａ側が送り側流路（高圧側）で、第２流路Ｂ側が戻り側流路（低圧側）である場合、第２流路Ｂ側から、作動油が第５分岐部15にて分流し、矢印にて示すように、排油バルブ２を通過してタンク１へ還流する（閉回路Ｃとタンク１とを排油バルブ２を介して循環する）。 The oil drain valve 2 is connected to a flow path branched from the fourth branch section 14 on the first flow path A side and a flow path branched from the fifth branch section 15 on the second flow path B side. 1 is connected to the flow path continuing to 1, and the first flow path A or the second flow path B and the tank 1 side can be switched between communication and non-communication.
Then, as shown in FIG. 2, when the first flow path A side is the feed flow path (high pressure side) and the second flow path B side is the return flow path (low pressure side), from the second flow path B side, The hydraulic oil is diverted at the fifth branch section 15 and passes through the oil discharge valve 2 and returns to the tank 1 as indicated by the arrows (circulates between the closed circuit C and the tank 1 via the oil discharge valve 2). To do).

排油バルブ２の下流側は、第３リリーフバルブ21を介してタンク１と接続されている。そして、排油バルブ２、第３リリーフバルブ21を通過した作動油は、（後述する排油流路４と合流してから）冷却用熱交換器８を介してタンク１へと戻る。
なお、油圧アクチュエータＭの作動中は、排油流路４（ソレノイドバルブ６）が非連通状態（閉状態）であり、作動油が排油流路４を流れることは無い。 The downstream side of the oil discharge valve 2 is connected to the tank 1 via a third relief valve 21. Then, the hydraulic oil that has passed through the oil discharge valve 2 and the third relief valve 21 returns to the tank 1 via the cooling heat exchanger 8 (after joining with the oil discharge passage 4 described later).
During the operation of the hydraulic actuator M, the oil drain passage 4 (solenoid valve 6) is in a non-communication state (closed state), and the hydraulic oil does not flow through the oil drain passage 4.

排油流路４は、油圧アクチュエータＭ（油圧ポンプ10）の停止の際に閉回路Ｃとタンク１との間において連通状態となり、チャージポンプ３にて作動油を閉回路Ｃからタンク１へ流すよう（逃がすよう）、閉回路Ｃに接続されている。
閉回路Ｃの油圧アクチュエータＭの停止時に、閉回路Ｃと接続させた排油流路４（が有するソレノイドバルブ６）を開いて、タンク１の作動油をチャージポンプ３から閉回路Ｃに供給し、作動油を閉回路Ｃから排油流路４を介してタンク１に戻している。なお、油圧アクチュエータＭが停止すれば、差圧が無くなって排油バルブ２は自動的に閉状態となり、作動油が排油バルブ２を流れることはない。 When the hydraulic actuator M (hydraulic pump 10) is stopped, the oil discharge passage 4 is in a communication state between the closed circuit C and the tank 1, and the charge pump 3 causes hydraulic oil to flow from the closed circuit C to the tank 1. It is connected to the closed circuit C.
When the hydraulic actuator M of the closed circuit C is stopped, the oil drain passage 4 (the solenoid valve 6) connected to the closed circuit C is opened, and the hydraulic oil in the tank 1 is supplied from the charge pump 3 to the closed circuit C. The hydraulic oil is returned from the closed circuit C to the tank 1 through the oil discharge passage 4. When the hydraulic actuator M is stopped, the differential pressure is lost, the oil discharge valve 2 is automatically closed, and the hydraulic oil does not flow through the oil discharge valve 2.

具体的な構成を説明すると、排油流路４は、第１流路Ａから第２分岐部12にて分流されかつタンク１方向へ作動油を通過可能とさせる第３チェックバルブ18を有する流路26と、第２流路Ｂから第３分岐部13にて分流されタンク１方向へ作動油を通過可能とさせる第４チェックバルブ19を有する流路27と、これら一対の流路26，27が合流した主流路28と、を有し、主流路28において、ソレノイドバルブ６と第２リリーフバルブ７と冷却用熱交換器８が設けられ、タンク１と接続されている。つまり、主流路28の途中部に、開閉切換バルブとされるソレノイドバルブ６と、第２リリーフバルブ７と、さらに、冷却用熱交換器８とが設けられている。   Explaining a specific configuration, the oil discharge passage 4 has a third check valve 18 that is diverted from the first passage A at the second branch portion 12 and allows hydraulic oil to pass in the direction of the tank 1. A flow path 26, a flow path 27 having a fourth check valve 19 that is diverted from the second flow path B at the third branch portion 13 and allows hydraulic oil to pass in the direction of the tank 1, and the pair of flow paths 26, 27 , And a solenoid valve 6, a second relief valve 7, and a cooling heat exchanger 8 are provided in the main channel 28 and connected to the tank 1. That is, the solenoid valve 6 that is an open / close switching valve, the second relief valve 7, and the cooling heat exchanger 8 are provided in the middle of the main flow path 28.

排油流路４は、油圧アクチュエータＭを挟んだ両側の流路Ａ，Ｂの夫々と接続されており、しかも、排油流路４は、油圧アクチュエータＭの近傍位置にて閉回路Ｃと接続されている。つまり、油圧アクチュエータＭと接続される流路Ａ，Ｂであって油圧アクチュエータＭの近傍（油圧アクチュエータＭから流路内径の20倍の寸法の範囲内）に第２分岐部12と第３分岐部13とが設けられている。
さらに、油圧アクチュエータＭと第２分岐部12との間、及び、油圧アクチュエータＭと第３分岐部13との間は、短い流路のみとなるようされている。つまり、油圧アクチュエータＭと分岐部12，13との間は、その他のバルブや分岐部を含まない短い流路とされている。 The oil drainage channel 4 is connected to each of the channels A and B on both sides of the hydraulic actuator M, and the oil drainage channel 4 is connected to the closed circuit C at a position near the hydraulic actuator M. Has been. That is, the second branch portion 12 and the third branch portion are the flow paths A and B connected to the hydraulic actuator M and in the vicinity of the hydraulic actuator M (within a range of 20 times the inner diameter of the flow path from the hydraulic actuator M). 13 is provided.
Further, only a short flow path is provided between the hydraulic actuator M and the second branch portion 12 and between the hydraulic actuator M and the third branch portion 13. That is, a short flow path between the hydraulic actuator M and the branch portions 12 and 13 does not include other valves and branch portions.

そして、チャージポンプ３には、作動油をリリーフ可能とさせる第１リリーフバルブ５（リリーフ圧ｐ1 ）と接続され、かつ、排油流路４は、閉回路Ｃ側から順に、油圧アクチュエータＭの停止の際に開状態となるソレノイドバルブ６と、第１リリーフバルブ５のリリーフ圧ｐ1 より小さいリリーフ圧ｐ2 に設定された（ｐ1 ＞ｐ2 ）第２リリーフバルブ７と、を有する。 The charge pump 3 is connected to a first relief valve 5 (relief pressure p 1 ) that enables hydraulic oil to be relieved, and the oil discharge passage 4 is connected to the hydraulic actuator M in order from the closed circuit C side. A solenoid valve 6 that is opened when stopped, and a second relief valve 7 that is set to a relief pressure p 2 that is smaller than the relief pressure p 1 of the first relief valve 5 (p 1 > p 2 ).

第２リリーフバルブ７のリリーフ圧ｐ2 は、油圧アクチュエータＭが停止し作動油を排油流路４にて還流させている際においても、閉回路Ｃ内に所定必要圧力（背圧）を確保させるよう設定されている。つまり、閉回路Ｃ内に背圧を立て、油圧ポンプ10及び油圧アクチュエータＭ自身のケースドレン（図示省略）からもタンク１へ作動油を還流させている。これにより、油圧ポンプ10や油圧アクチュエータＭにて発生した熱により上昇した温度（閉回路Ｃの温度、油温）を、作動油の潤滑により迅速に低下させることができる。 The relief pressure p 2 of the second relief valve 7 ensures a predetermined required pressure (back pressure) in the closed circuit C even when the hydraulic actuator M is stopped and the hydraulic oil is recirculated through the oil discharge passage 4. It is set to let you. That is, back pressure is established in the closed circuit C, and hydraulic oil is recirculated to the tank 1 also from the case drain (not shown) of the hydraulic pump 10 and the hydraulic actuator M itself. Thereby, the temperature (the temperature of the closed circuit C, the oil temperature) increased by the heat generated by the hydraulic pump 10 and the hydraulic actuator M can be quickly reduced by lubricating the hydraulic oil.

排油流路４の閉状態から開状態への切換は、油圧アクチュエータＭ（油圧ポンプ10）を停止すべき停止信号に伴って行われ、開状態から閉状態への切換は、油圧アクチュエータＭの作動開始信号に伴って行われる。例えば、油圧駆動装置の運転者が、油圧アクチュエータＭの作動を停止させるために、図示省略するが、操作レバーを作動位置から停止位置へと切り換えることで、操作レバーと接続された制御手段が、排油流路４のソレノイドバルブ６に開動作信号を送信し、図３に示すように、ソレノイドバルブ６が閉から開へ切り換わる。   Switching from the closed state to the open state of the oil discharge passage 4 is performed in accordance with a stop signal to stop the hydraulic actuator M (hydraulic pump 10), and switching from the open state to the closed state is performed by the hydraulic actuator M. This is performed in accordance with the operation start signal. For example, although a driver of the hydraulic drive apparatus stops the operation of the hydraulic actuator M, the control means connected to the operation lever is switched by switching the operation lever from the operation position to the stop position. An opening operation signal is transmitted to the solenoid valve 6 of the oil discharge passage 4, and the solenoid valve 6 is switched from closed to open as shown in FIG.

つまり、この操作レバーの停止への切換により、油圧ポンプ10が吐出ゼロとなり、油圧アクチュエータＭが停止し、かつ、排油流路４のソレノイドバルブ６が開となり、作動油を、チャージポンプ３による吐出圧でもってチャージポンプ３から閉回路Ｃ内を経て、排油流路４を通過させタンク１へ還流させる（閉回路Ｃとタンク１とをチャージポンプ３により排油流路４を介して循環させる）。
または、図示省略するが、油圧アクチュエータＭの動作に応じて位置センサ（図示省略）が働き、制御手段から停止信号が自動的に送信され、ソレノイドバルブ６が閉から開に切り換わるようしてもよい。 That is, by switching to the stop of the operation lever, the hydraulic pump 10 becomes zero discharge, the hydraulic actuator M is stopped, the solenoid valve 6 of the oil discharge passage 4 is opened, and the hydraulic oil is supplied by the charge pump 3. With the discharge pressure, the charge pump 3 passes through the closed circuit C, passes through the oil drain passage 4 and is returned to the tank 1 (the closed circuit C and the tank 1 are circulated through the oil drain passage 4 by the charge pump 3). )
Alternatively, although not shown, a position sensor (not shown) works according to the operation of the hydraulic actuator M, a stop signal is automatically transmitted from the control means, and the solenoid valve 6 is switched from closed to open. Good.

そして、油圧アクチュエータＭの作動を停止させる停止信号が入力されると、図３に示すように、排油流路４のソレノイドバルブ６が閉から開となり、また、油圧アクチュエータＭが停止して第１流路Ａと第２流路Ｂとの間の差圧が無くなって排油バルブ２が閉となる。そして、チャージポンプ３から吐出される作動油は、図３の矢印に示すように、第１分岐部11から第１チェックバルブ16と第２チェックバルブ17の夫々を通過し、第１流路Ａと第２流路Ｂとの双方を流れ、（排油バルブ２側へは流れずに）第１流路Ａにおいて第２分岐部12から排油流路４へ作動油が流れ、かつ、第２流路Ｂにおいて第３分岐部13から排油流路４へ作動油が流れ、合流部25から開状態のソレノイドバルブ６及び第２リリーフバルブ７とを通過し、さらに、冷却用熱交換器８を経てタンク１へと流れる。   When a stop signal for stopping the operation of the hydraulic actuator M is input, as shown in FIG. 3, the solenoid valve 6 of the oil discharge passage 4 is opened from the closed state, and the hydraulic actuator M is stopped and The pressure difference between the first flow path A and the second flow path B disappears, and the oil discharge valve 2 is closed. The hydraulic oil discharged from the charge pump 3 passes through the first check valve 16 and the second check valve 17 from the first branch portion 11 as shown by the arrows in FIG. And the second flow path B (without flowing to the oil discharge valve 2 side), the hydraulic oil flows from the second branch portion 12 to the oil discharge flow path 4 in the first flow path A, and In the two flow paths B, the hydraulic oil flows from the third branch part 13 to the oil discharge flow path 4, passes through the solenoid valve 6 and the second relief valve 7 in the open state from the merging part 25, and further, the cooling heat exchanger It flows to the tank 1 through 8.

なお、本発明に係る油圧駆動装置は、油圧アクチュエータＭを有する装置において適用することができ、例えば、図示省略するが油圧シリンダを有し吊荷を昇降させる昇降装置や、油圧ウインチ等に用いることができる。   The hydraulic drive apparatus according to the present invention can be applied to an apparatus having a hydraulic actuator M. For example, although not shown, the hydraulic drive apparatus is used for an elevating apparatus that has a hydraulic cylinder and lifts a suspended load, a hydraulic winch, or the like. Can do.

以上のように、本発明によれば、油圧ポンプ10に一対の流路Ａ，Ｂを介して油圧アクチュエータＭを接続させた閉回路Ｃと、閉回路Ｃへ作動油を補給するチャージポンプ３と、油圧アクチュエータＭの作動により生じた一対の流路Ａ，Ｂの差圧により開状態となって閉回路Ｃから作動油をタンク１へ還流させる排油バルブ２と、油圧アクチュエータＭの停止の際に閉回路Ｃとタンク１との間において連通状態となりチャージポンプ３にて作動油を閉回路Ｃからタンク１へ流す排油流路４と、を備えたものであるため、油圧アクチュエータＭが作動中及び停止中のいずれの場合においても閉回路Ｃ内の作動油を入れ換えることができ、効率よく閉回路Ｃ及び作動油を冷却することができる。   As described above, according to the present invention, the closed circuit C in which the hydraulic actuator M is connected to the hydraulic pump 10 through the pair of flow paths A and B, and the charge pump 3 that supplies hydraulic oil to the closed circuit C, When the hydraulic actuator M is stopped, the oil discharge valve 2 is opened by the differential pressure between the pair of flow paths A and B generated by the operation of the hydraulic actuator M and returns the hydraulic oil from the closed circuit C to the tank 1. In addition, the hydraulic actuator M is actuated because it is provided with a drainage flow path 4 that is in a communication state between the closed circuit C and the tank 1 and that allows the charge pump 3 to flow hydraulic oil from the closed circuit C to the tank 1. The hydraulic oil in the closed circuit C can be exchanged in both cases of middle and stopped, and the closed circuit C and the hydraulic oil can be efficiently cooled.

排油流路４は、油圧アクチュエータＭの近傍位置にて閉回路Ｃと接続されているため、閉回路Ｃ全体にわたって作動油の入れ換えが可能となり、また、油圧アクチュエータＭにて発生した熱により上昇した温度も迅速に低下させることができる。   The oil drain passage 4 is connected to the closed circuit C at a position near the hydraulic actuator M, so that the hydraulic oil can be replaced over the entire closed circuit C, and the oil drain passage 4 is raised by the heat generated by the hydraulic actuator M. The reduced temperature can also be quickly reduced.

チャージポンプ３は、作動油をリリーフ可能とさせる第１リリーフバルブ５と接続され、かつ、排油流路４は、閉回路Ｃ側から順に、油圧アクチュエータＭの停止の際に開状態となるソレノイドバルブ６と、第１リリーフバルブ５のリリーフ圧ｐ1 より小さいリリーフ圧ｐ2 に設定された第２リリーフバルブ７と、を有するため、油圧アクチュエータＭが停止された状態で、作動油を排油流路４にてタンク１へ確実に還流させることができる。 また、油圧アクチュエータＭを停止すべき停止信号に伴って電気的にソレノイドバルブ６を開動作させることで、確実に油圧アクチュエータＭの停止時に排油流路４を機能させることができる。 The charge pump 3 is connected to a first relief valve 5 that enables hydraulic oil to be relieved, and the oil discharge passage 4 is a solenoid that is opened when the hydraulic actuator M is stopped in order from the closed circuit C side. Since the valve 6 and the second relief valve 7 set to a relief pressure p 2 smaller than the relief pressure p 1 of the first relief valve 5 are provided, the hydraulic oil is drained while the hydraulic actuator M is stopped. The flow path 4 can reliably return to the tank 1. In addition, by electrically opening the solenoid valve 6 in response to a stop signal for stopping the hydraulic actuator M, the oil discharge passage 4 can be functioned reliably when the hydraulic actuator M is stopped.

さらに、第２リリーフバルブ７により、油圧アクチュエータＭが停止し作動油を排油流路４にて還流させている際においても、チャージポンプ３の吐出圧にて閉回路Ｃ内に所定必要圧力（背圧）を確保させることができる。これにより、油圧アクチュエータＭが停止している際においても、閉回路Ｃ内に背圧を立て、油圧ポンプ10及び油圧アクチュエータＭ自身のケースドレンからもタンク１へ作動油を還流させることができる。従って、油圧ポンプ10や油圧アクチュエータＭにて発生した熱により上昇した温度を、作動油の潤滑により迅速に低下させることができる。   Further, even when the hydraulic actuator M is stopped by the second relief valve 7 and the hydraulic oil is recirculated in the oil discharge passage 4, a predetermined required pressure (closed in the closed circuit C by the discharge pressure of the charge pump 3 ( Back pressure) can be secured. Thereby, even when the hydraulic actuator M is stopped, back pressure can be raised in the closed circuit C, and the hydraulic oil can be recirculated to the tank 1 from the case drain of the hydraulic pump 10 and the hydraulic actuator M itself. Therefore, the temperature increased by the heat generated by the hydraulic pump 10 and the hydraulic actuator M can be quickly reduced by the lubrication of the hydraulic oil.

本発明の油圧駆動装置の実施の一形態を示す概略構成図である。It is a schematic block diagram which shows one Embodiment of the hydraulic drive device of this invention. 油圧アクチュエータが作動状態にある油圧駆動装置の概略構成図である。It is a schematic block diagram of the hydraulic drive device which a hydraulic actuator is in an operation state. 油圧アクチュエータが停止状態にある油圧駆動装置の概略構成図である。It is a schematic block diagram of the hydraulic drive device in which a hydraulic actuator is in a stopped state.

符号の説明Explanation of symbols

１ タンク
２ 排油バルブ
３ チャージポンプ
４ 排油流路
５ 第１リリーフバルブ
６ ソレノイドバルブ
７ 第２リリーフバルブ
10 油圧ポンプ
Ａ （第１）流路
Ｂ （第２）流路
Ｃ 閉回路
Ｍ 油圧アクチュエータ
ｐ1 リリーフ圧
ｐ2 リリーフ圧 DESCRIPTION OF SYMBOLS 1 Tank 2 Oil drain valve 3 Charge pump 4 Oil drain flow path 5 1st relief valve 6 Solenoid valve 7 2nd relief valve
10 Hydraulic pump A (first) flow path B (second) flow path C closed circuit M hydraulic actuator p 1 relief pressure p 2 relief pressure

Claims (3)

油圧ポンプ（10）に一対の流路（Ａ）（Ｂ）を介して油圧アクチュエータ（Ｍ）を接続させた閉回路（Ｃ）と、上記閉回路（Ｃ）へ作動油を補給するチャージポンプ（３）と、上記油圧アクチュエータ（Ｍ）の作動により生じた上記一対の流路（Ａ）（Ｂ）の差圧により開状態となって上記閉回路（Ｃ）から作動油をタンク（１）へ還流させる排油バルブ（２）と、上記油圧アクチュエータ（Ｍ）の停止の際に上記閉回路（Ｃ）と上記タンク（１）との間において連通状態となり上記チャージポンプ（３）にて作動油を上記閉回路（Ｃ）から上記タンク（１）へ流す排油流路（４）と、を備えたことを特徴とする油圧駆動装置。 A pair of flow paths to the hydraulic pump (10) and (A) closed circuit is connected to the hydraulic actuator (M) through (B) (C), a charge pump for replenishing the hydraulic fluid above the closed circuit to the (C) ( and 3), the pair of the channel caused by operation of the hydraulic actuator (M) to (a) (tank hydraulic oil from the closed circuit (C) in the open state due to the pressure difference B) (1) and the oil discharge valve (2) for recirculating said closed circuit when the stop of the hydraulic actuator (M) (C) and the hydraulic oil in the charge pump becomes a communicating state (3) between the said tank (1) the hydraulic drive apparatus characterized by comprising a an oil discharge passage (4) to flow the closed circuit from (C) to the tank (1). 上記排油流路（４）は、上記油圧アクチュエータ（Ｍ）の近傍位置にて上記閉回路（Ｃ）と接続されている請求項１記載の油圧駆動装置。   The hydraulic drive unit according to claim 1, wherein the oil discharge passage (4) is connected to the closed circuit (C) at a position near the hydraulic actuator (M). 上記チャージポンプ（３）は、作動油をリリーフ可能とさせる第１リリーフバルブ（５）と接続され、かつ、上記排油流路（４）は、上記閉回路（Ｃ）側から順に、上記油圧アクチュエータ（Ｍ）の停止の際に開状態となるソレノイドバルブ（６）と、上記第１リリーフバルブ（５）のリリーフ圧（ｐ１）より小さいリリーフ圧（ｐ２）に設定された第２リリーフバルブ（７）と、を有する請求項１又は２記載の油圧駆動装置。 The charge pump (3) is connected to a first relief valve (5) that enables hydraulic oil to be relieved, and the oil discharge passage (4) is arranged in order from the closed circuit (C) side. A solenoid valve (6) that is opened when the actuator (M) is stopped, and a second relief set to a relief pressure (p 2 ) smaller than the relief pressure (p 1 ) of the first relief valve (5). The hydraulic drive device according to claim 1, further comprising a valve (7).
JP2004123879A 2004-04-20 2004-04-20 Hydraulic drive Expired - Fee Related JP4431435B2 (en)

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JP2008101636A (en) * 2006-10-17 2008-05-01 Kayaba Ind Co Ltd Hydraulic drive device with flushing circuit
CN103047203B (en) * 2013-01-05 2015-09-09 三一重工股份有限公司 A kind of hydraulic driving system and engineering machinery
JP6161930B2 (en) * 2013-03-22 2017-07-12 住友重機械工業株式会社 Hydraulic circuit, hydraulic cylinder, processing machine equipped with the hydraulic cylinder, and hydraulic circuit control method
CN120346861A (en) * 2025-06-23 2025-07-22 福建德睿工业科技集团有限公司 Single cylinder cone crusher hydraulic pressure station fluid replenishing device

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