JP4822320B2 - Variable displacement bidirectional rotary pump and hydraulic circuit using the pump - Google Patents

Variable displacement bidirectional rotary pump and hydraulic circuit using the pump Download PDF

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JP4822320B2
JP4822320B2 JP2005336994A JP2005336994A JP4822320B2 JP 4822320 B2 JP4822320 B2 JP 4822320B2 JP 2005336994 A JP2005336994 A JP 2005336994A JP 2005336994 A JP2005336994 A JP 2005336994A JP 4822320 B2 JP4822320 B2 JP 4822320B2
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discharge
rotary pump
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JP2007138894A (en
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博一 平出
達士 寺沢
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Yuken Kogyo Co Ltd
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Description

本発明は、圧油等の液体を２つの吐出口から対応する各作動部へぞれぞれ供給する可変容量形双方向回転ポンプに関するものである。   The present invention relates to a variable displacement bidirectional rotary pump that supplies a liquid such as pressure oil from two discharge ports to corresponding operating parts.

双方向回転ポンプは、２つの吐出口を有し、正逆回転方向によって何れかの吐出口から圧油を吐出するものであり、例えば図４の油圧回路に示すような両吐出流路を油圧シリンダに接続するだけで油圧制御システムを簡便に構成することができる。このような双方向回転ポンプにおいては、正逆回転方向の切換で吐出方向を変更することによって、作動油の方向制御を行い油圧シリンダの移動方向を変更することができる。また回転数を制御することによって所望の流量、圧力等の条件が得られる（例えば、特許文献１参照。）。   The bidirectional rotary pump has two discharge ports, and discharges pressure oil from one of the discharge ports depending on the forward and reverse rotation directions. For example, both discharge flow paths as shown in the hydraulic circuit of FIG. The hydraulic control system can be simply configured simply by connecting to the cylinder. In such a bi-directional rotary pump, by changing the discharge direction by switching between the forward and reverse rotation directions, the direction of hydraulic oil can be controlled to change the movement direction of the hydraulic cylinder. Moreover, conditions, such as desired flow volume and a pressure, are obtained by controlling rotation speed (for example, refer patent document 1).

このような双方向回転ポンプの回転数制御システムにおいては、固定斜板を用いた低容量形が採用されている。この場合、ポンプは圧力制御時、回路の漏れ補償分の微小回転数で運転している。   In such a rotational speed control system of the bidirectional rotary pump, a low capacity type using a fixed swash plate is employed. In this case, the pump is operated at a minute speed corresponding to the leakage compensation of the circuit during pressure control.

特開２００２−２６６７７０号公報JP 2002-266770 A

一方、モータにかかる負荷トルクは吐出圧力×ポンプ押しのけ容積で表されるが、流量制御時に大流量を必要とする場合には、ポンプ押しのけ容積の大きいものが必要とされる。しかしながら、ポンプ押しのけ容積が大きいものを用いる場合、圧力制御時に負荷トルクも大きなものとなってしまうため、モータも大容量用を選択する必要があり、装置全体が大型化すると共に非効率的であった。   On the other hand, the load torque applied to the motor is expressed by discharge pressure × pump displacement. When a large flow rate is required during flow rate control, a large pump displacement volume is required. However, when a pump with a large displacement is used, the load torque becomes large during pressure control, so it is necessary to select a motor with a large capacity, which increases the overall size of the apparatus and is inefficient. It was.

本発明の目的は、上記問題点に鑑み、流量制御時の大流量を可能としながらも高圧を要する圧力制御時にモータにかかる負荷トルクを小さく抑えてモータの小型化を可能とし、従来より効率的な双方向回転ポンプを提供することにある。   The object of the present invention is to reduce the load torque applied to the motor during pressure control that requires a high pressure while enabling a large flow rate during flow control, and to reduce the size of the motor, in view of the above problems, and is more efficient than before. Is to provide a simple bidirectional rotary pump.

上記目的を達成するため、請求項１に記載の発明に係る可変容量形双方向回転ポンプは、２つの液体吐出口を有し、原動機による回転駆動で液体を吸引し、且つその液体を回転方向によって選択的に特定される前記２つの吐出口のうちのいずれかから吐出する双方向回転ポンプ機構と、受圧部に作用するパイロット圧力の増減に応じて機械的に変位することにより前記ポンプ機構の単位回転当たりの吐出容量を変化させる容量可変機構と、該容量可変機構を大容量側に変位させるときは前記受圧部を低圧側流路に接続して前記パイロット圧力を低下させる第１の回路接続を形成すると共に容量可変機構を小容量側に変位させるときは前記パイロット圧力として前記ポンプ機構の自己の吐出圧力を前記受圧部に導く第２の回路接続を形成する切換弁と、を備え、前記切換弁が第２の回路接続を形成しているときに前記受圧部側から前記ポンプ機構の２つの吐出口にそれぞれ連通する第１と第２の吐出側流路への液体の流出を阻止して前記受圧部に作用しているパイロット圧力を封じ込める液体流出阻止手段をさらに備えているものである。 In order to achieve the above object, a variable displacement bidirectional rotary pump according to the first aspect of the present invention has two liquid discharge ports, sucks liquid by rotational driving by a prime mover, and rotates the liquid in the rotational direction. A bidirectional rotary pump mechanism that discharges from either one of the two discharge ports that is selectively specified by a mechanical displacement of the pump mechanism by mechanically displacing the pilot pressure that acts on the pressure receiving portion A variable capacity mechanism for changing the discharge capacity per unit rotation, and a first circuit connection for lowering the pilot pressure by connecting the pressure receiving portion to the low pressure side flow path when the variable capacity mechanism is displaced to the large capacity side And a second circuit connection for guiding the discharge pressure of the pump mechanism to the pressure receiving portion as the pilot pressure. And the valve, wherein the switching valve to the first and second discharge-side flow paths respectively communicating with two outlet of the pump mechanism from the pressure receiving portion side when forming the second circuit connection Liquid outflow prevention means for containing the pilot pressure acting on the pressure receiving portion by preventing the liquid outflow .

請求項２に記載の発明に係る可変容量形双方向回転ポンプは、請求項１に記載の可変容量形双方向回転ポンプにおいて、前記液体流出阻止手段が、前記受圧部からの前記第１および第２の吐出側流路への液体の逆流を阻止する逆止弁によって構成されているものである。 A variable displacement bidirectional rotary pump according to a second aspect of the present invention is the variable displacement bidirectional rotary pump according to the first aspect , wherein the liquid outflow prevention means includes the first and the first from the pressure receiving portion. It is comprised by the non-return valve which prevents the back flow of the liquid to 2 discharge side flow paths.

請求項３に記載の発明に係る可変容量形双方向回転ポンプは、請求項２に記載の可変容量形双方向回転ポンプは、前記ポンプ機構の第１と第２の吐出側流路から分岐して一部の自己圧をパイロット圧力として前記切換弁に導入するパイロット流路中に、絞り弁を配置したものである。 Variable displacement bidirectional rotary pump according to the invention of claim 3, variable displacement bidirectional rotary pump according to claim 2, it branched from the first and second discharge-side flow path of the pump mechanism Thus, a throttle valve is arranged in a pilot flow path that introduces a part of the self-pressure as a pilot pressure into the switching valve.

請求項４に記載の発明に係る前記請求項１〜３の何れかに記載の可変容量形双方向回転ポンプを用いた油圧回路は、前記可変容量形双方向回転ポンプからアクチュエータ駆動用油圧シリンダへ圧油を導入する油圧回路であって、前記容量可変機構を小容量側に変位させるための前記切換弁による第２の回路接続の形成が、前記油圧シリンダへの圧油導入流量制御における高速側への変位となり、前記容量可変機構を大容量側に変位させるための前記切換弁による第１の回路接続の形成が、前記油圧シリンダへの圧油導入圧力制御における高圧側への変位となることを特徴とするものである。 A hydraulic circuit using the variable displacement bidirectional rotary pump according to any one of claims 1 to 3 according to the invention described in claim 4 is configured to change from the variable displacement bidirectional rotary pump to an actuator driving hydraulic cylinder. In the hydraulic circuit for introducing pressure oil, the formation of the second circuit connection by the switching valve for displacing the capacity variable mechanism to the small capacity side is a high speed side in the pressure oil introduction flow control to the hydraulic cylinder. Therefore, the formation of the first circuit connection by the switching valve for displacing the capacity variable mechanism to the large capacity side becomes the displacement to the high pressure side in the pressure oil introduction pressure control to the hydraulic cylinder. It is characterized by.

本発明は、双方向回転ポンプ機構に２容量可変機構を切換弁を介して備え、この切換弁によって第１の回路接続を形成することにより容量可変機構の受圧部を低圧側流路に接続して受圧部に作用するパイロット圧力を低下させて大容量側に変位させると共に第２の回路接続を形成することによりポンプ機構の自己の吐出圧力をパイロット圧力として前記受圧部に導いて容量可変機構を小容量側に変位させるものであるため、本発明による可変容量形双方向回転ポンプを用いれば、流量制御時にはポンプ容量を大容量とすることができると共に高圧を要する圧力制御時には大容量から小容量へ切り換えることができるため、モータは負荷トルクが小さく抑えられるので小型のもので済み、ポンプの装置構成は大型化することなく作業効率が向上するという効果がある。   In the present invention, the bidirectional rotary pump mechanism is provided with a two-capacity variable mechanism via a switching valve, and the first circuit connection is formed by this switching valve to connect the pressure receiving portion of the variable capacity mechanism to the low-pressure side flow path. The pilot pressure acting on the pressure receiving part is lowered and displaced to the large capacity side, and the second circuit connection is formed, so that the self discharge pressure of the pump mechanism is guided to the pressure receiving part as the pilot pressure, and the variable capacity mechanism is Since the variable displacement bi-directional rotary pump according to the present invention is used for displacement of the small capacity side, the pump capacity can be increased during flow control, and from large capacity to small capacity during pressure control requiring high pressure. Since the load torque of the motor can be kept small, the motor can be small, and the pump configuration is improved without increasing the size of the pump. There is an effect that that.

本発明は、原動機による回転駆動で液体を吸引してその液体を回転方向によって選択的に特定される２つの吐出口のうちのいずれかから吐出する双方向回転ポンプ機構に、切換弁を介して、受圧部に作用するパイロット圧力の増減に応じて機械的に変位することにより前記ポンプ機構の単位回転当たりの吐出容量を変化させる容量可変機構を備えて２容量切換形としたものである。   The present invention relates to a bidirectional rotary pump mechanism that sucks a liquid by rotational driving by a prime mover and discharges the liquid from one of two discharge ports that are selectively specified by the rotational direction via a switching valve. A two-capacity switching type is provided with a variable capacity mechanism that changes the discharge capacity per unit rotation of the pump mechanism by mechanically displacing in accordance with the increase or decrease of the pilot pressure acting on the pressure receiving portion.

即ち、切換弁は、容量可変機構を大容量側に変位させるときは前記受圧部を低圧側流路に接続してパイロット圧力を低下させる第１の回路接続を形成すると共に容量可変機構を小容量側に変位させるときはパイロット圧力としてポンプ機構の自己の吐出圧力を前記受圧部に導く第２の回路接続を形成するものである。   That is, the switching valve forms a first circuit connection for lowering the pilot pressure by connecting the pressure receiving portion to the low-pressure side flow path when displacing the variable capacity mechanism to the large capacity side, and the small capacity of the variable capacity mechanism. When displacing to the side, a second circuit connection is formed that guides the discharge pressure of the pump mechanism to the pressure receiving portion as a pilot pressure.

従って、本発明によれば、このような切換弁によって、流量制御時にはポンプ容量を大容量とすることができると共に、高圧を要する圧力制御時には大容量から小容量へ切り換えることができるため、モータに係る負荷トルクを小さく抑えることができ、モータは小型のもので済み、装置が大型化することなく効率的な双方向回転ポンプが得られる。   Therefore, according to the present invention, such a switching valve can increase the pump capacity during flow control, and can switch from large capacity to small capacity during pressure control requiring high pressure. Such load torque can be kept small, the motor can be small, and an efficient bidirectional rotary pump can be obtained without increasing the size of the apparatus.

なお、容量可変機構としては、例えば図１に示すような斜板式を用いるのが簡便である。この場合には、容量可変機構７の受圧部８はパイロット圧力に応じて斜板９の傾斜角度を変えるものとなる。即ち、切換弁６が第２の回路接続を形成した状態（図１のポートＰＡ接続状態）にて、双方向回転ポンプ機構１の２つの吐出口にそれぞれ連通する第１の吐出側流路２Ｘ又は第２の吐出側流路２Ｙから一部の自己圧が第１または第２のパイロット流路（３Ｘ，３Ｙ）を介して導かれてなるパイロット圧力が受圧部８へ作用し、該受圧部８が斜板９を押圧してその傾斜角度を小さくし、ポンプ機構１の吐出量が小容量側に切り換えられ、また、切換弁６が第１の回路接続を形成した状態（ポートＢＴ接続状態）にてパイロット圧油の導入を止め、パイロット圧力が小さくなるに従って受圧部８への作用が軽減され、斜板９の押圧が解除されつつ傾斜角度が大きくなり、ポンプ機構１の吐出量が大容量側に切り換えられる。 For example, a swash plate type as shown in FIG. In this case, the pressure receiving portion 8 of the variable capacity mechanism 7 changes the inclination angle of the swash plate 9 according to the pilot pressure. That is, in a state where the switching valve 6 forms the second circuit connection (port PA connection state in FIG. 1), the first discharge-side flow path 2X that communicates with the two discharge ports of the bidirectional rotary pump mechanism 1 respectively. Alternatively, a pilot pressure obtained by introducing a part of the self-pressure from the second discharge side flow passage 2Y through the first or second pilot flow passage (3X, 3Y) acts on the pressure receiving portion 8, and the pressure receiving portion. 8 presses the swash plate 9 to reduce its inclination angle, the discharge amount of the pump mechanism 1 is switched to the small capacity side, and the switching valve 6 forms the first circuit connection (port BT connection state) ), The introduction of the pilot pressure oil is stopped, and the action on the pressure receiving portion 8 is reduced as the pilot pressure decreases, the inclination angle increases while releasing the pressing of the swash plate 9, and the discharge amount of the pump mechanism 1 increases. Switch to the capacity side.

このような切換弁によって２容量切換となる容量可変機構を備えたことによって、本発明による双方向回転ポンプでは、流量制御時には大容量側に切換えて大流量とすることができると共に、圧力制御時には小容量側に切り換えてモータにかかる負荷トルクを小さく抑えることができるため、モータは小型のもので済み、装置構成が大型化することなく効率的な双方向回転ポンプを実現できる。   By providing a capacity variable mechanism that switches between two capacities by such a switching valve, the bidirectional rotary pump according to the present invention can switch to a large capacity side at the time of flow rate control and can increase the flow rate, and at the time of pressure control. Since the load torque applied to the motor can be kept small by switching to the small capacity side, the motor can be small, and an efficient bidirectional rotary pump can be realized without increasing the size of the apparatus.

なお、上記図１に示すような斜板式の可変容量形ポンプでは、斜板角制御を自己圧で行うものであるため、小容量側に切り換え、吐出し圧力がポンプ最低調整圧力以下になると、容量可変機構７は斜板９を押すためのパイロット圧を確保できずに斜板角を小さい状態に維持することが困難となり、斜板９が勝手に動く無制御状態になることがある。よって、低圧領域において吐出し量を一定に保つのは非常に難しくなる。   In the swash plate type variable displacement pump as shown in FIG. 1, since the swash plate angle control is performed by the self-pressure, switching to the small capacity side, and when the discharge pressure is below the pump minimum adjustment pressure, The capacity variable mechanism 7 cannot secure a pilot pressure for pushing the swash plate 9 and it is difficult to maintain the swash plate angle in a small state, and the swash plate 9 may move freely. Therefore, it is very difficult to keep the discharge amount constant in the low pressure region.

そこで、切換弁６に、第２の回路接続を形成しているときに前記受圧部８側からポンプ機構１の第１および第２の吐出側流路（２Ｘ，２Ｙ）への液体の流出を阻止して受圧部８に作用しているパイロット圧力を封じ込める液体流出阻止手段をさらに備えることによって、容量可変機構７を小容量側に切り換えた際に、ポンプ機構１の吐出し圧力が最低調整圧力以下となっても、この液体流出阻止手段により封じ込められたパイロット圧力が受圧部８に作用し続けることができるため、低圧領域でも安定な制御状態が維持できる。   Therefore, when the second circuit connection is formed in the switching valve 6, the liquid flows out from the pressure receiving unit 8 side to the first and second discharge side flow paths (2X, 2Y) of the pump mechanism 1. By further including a liquid outflow prevention means for blocking and confining the pilot pressure acting on the pressure receiving portion 8, when the capacity variable mechanism 7 is switched to the small capacity side, the discharge pressure of the pump mechanism 1 is the lowest adjustment pressure. Even in the following case, the pilot pressure enclosed by the liquid outflow prevention means can continue to act on the pressure receiving portion 8, so that a stable control state can be maintained even in the low pressure region.

液体流出阻止手段としては、まず、受圧部８からポンプ機構１の第１および第２の吐出側流路（２Ｘ，２Ｙ）への液体の逆流を阻止する逆止弁を用いるのが最も簡便で効率的な構成として好ましい。具体的には、第１の吐出側流路２Ｘおよび第２の吐出側流路２Ｙと切換弁６との間、即ち第１の吐出側流路２Ｘから分岐する第１のパイロット流路３Ｘ中、第２の吐出側流路２Ｘから分岐する第２のパイロット流路３Ｙ中のそれぞれに逆止弁（４Ｘ，４Ｙ）を配置することができる。   As the liquid outflow prevention means, first of all, it is most convenient to use a check valve for preventing the backflow of liquid from the pressure receiving portion 8 to the first and second discharge side flow paths (2X, 2Y) of the pump mechanism 1. This is preferable as an efficient configuration. Specifically, between the first discharge side flow path 2X and the second discharge side flow path 2Y and the switching valve 6, that is, in the first pilot flow path 3X branched from the first discharge side flow path 2X. A check valve (4X, 4Y) can be disposed in each of the second pilot flow paths 3Y branched from the second discharge side flow path 2X.

また、切換弁の構成部品の隙間で生じる小さな液体リークが封じ込めたパイロット圧力を幾らか減じることが考えられるため、より確実にパイロット圧力を確保するために、切換弁６内に逆止弁を設けてノンリーク機構としてもよい。   In addition, since a small liquid leak generated in the gap between the components of the switching valve may reduce the trapped pilot pressure somewhat, a check valve is provided in the switching valve 6 to ensure the pilot pressure more reliably. A non-leak mechanism may be used.

また、パイロット流路中に絞り弁８を設けることにより、容量可変機構７での切換時における挙動を低減させ、ショックレス機構として機能させることができる。   Further, by providing the throttle valve 8 in the pilot flow path, the behavior at the time of switching in the variable capacity mechanism 7 can be reduced, and it can function as a shockless mechanism.

さらに、以上のような可変容量形双方向回転ポンプを用いてその圧油をアクチュエータ駆動用油圧シリンダへ導入する油圧回路では、切換弁による容量可変機構の変位を、高速切換形と高圧切換形との切換に設定するなど、所望の回路構成を容易に得ることができる。例えば、容量可変機構を小容量側に変位させるための前記切換弁による第２の回路接続の形成を、油圧シリンダへの圧油導入流量制御における低速から高速側への変位とすることができ、容量可変機構を大容量側に変位させるために受容部を低圧側流路に接続する前記切換弁による第１の回路接続の形成を、油圧シリンダへの圧油導入圧力制御における低圧から高圧側への変位とすることができる。   Furthermore, in the hydraulic circuit that introduces the pressure oil into the actuator-driven hydraulic cylinder using the variable displacement bidirectional rotary pump as described above, the displacement of the variable displacement mechanism by the switching valve is changed between a high-speed switching type and a high-pressure switching type. It is possible to easily obtain a desired circuit configuration, such as setting to switching. For example, the formation of the second circuit connection by the switching valve for displacing the capacity variable mechanism to the small capacity side can be a displacement from the low speed to the high speed side in the pressure oil introduction flow control to the hydraulic cylinder, In order to displace the capacity variable mechanism to the large capacity side, the first circuit connection is formed by the switching valve that connects the receiving portion to the low pressure side flow path from the low pressure to the high pressure side in the pressure oil introduction pressure control to the hydraulic cylinder. Displacement.

以上のような本発明による可変容量形双方向回転ポンプは、各種油圧回路に採用することができ、装置全体の小型化、効率化に寄与する。   The variable displacement bidirectional rotary pump according to the present invention as described above can be employed in various hydraulic circuits and contributes to downsizing and efficiency of the entire apparatus.

本発明の一実施例として、斜板式可変容量機構を備えた双方向回転ポンプを用いた油圧回路を図２に示す。図２（ａ）は可変容量機構を小容量側に変位させる第２の回路接続が形成された状態を示す油圧回路図であり、（ｂ）は可変容量機構を大容量側に変位させる第１の回路接続が形成された状態を示す油圧回路図である。   As an embodiment of the present invention, a hydraulic circuit using a bidirectional rotary pump having a swash plate type variable displacement mechanism is shown in FIG. FIG. 2A is a hydraulic circuit diagram showing a state in which a second circuit connection for displacing the variable capacity mechanism to the small capacity side is formed, and FIG. 2B is a first circuit diagram for displacing the variable capacity mechanism to the large capacity side. It is a hydraulic circuit diagram which shows the state in which the circuit connection of was formed.

本実施例による油圧回路は、図１に示したものと同様の構成を備えた可変容量形双方向回転ポンプの二つの吐出口を直列的に油圧シリンダに接続してなる油圧制御回路を示すものである。即ち、本可変容量形双方向回転ポンプは、双方向回転ポンプ機構１１に電磁切換弁１６を介して容量可変機構１７が備えられたものである。ポンプの２つの吐出口にそれぞれ連通する第１の吐出側流路１２Ｘと第２の吐出側流路１２Ｙとが、アクチュエータ駆動用の油圧シリンダ２０に直列的に接続されるものである。   The hydraulic circuit according to this embodiment is a hydraulic control circuit in which two discharge ports of a variable displacement bidirectional rotary pump having the same configuration as that shown in FIG. 1 are connected in series to a hydraulic cylinder. It is. That is, this variable displacement bidirectional rotary pump is obtained by providing a variable displacement mechanism 17 to the bidirectional rotary pump mechanism 11 via the electromagnetic switching valve 16. A first discharge-side flow path 12X and a second discharge-side flow path 12Y that communicate with the two discharge ports of the pump are connected in series to the hydraulic cylinder 20 for driving the actuator.

双方向回転ポンプ機構１１は、正逆双方向に圧油を供給でき、その正逆回転方向によって圧油の吐出方向が選択され、回転数の制御によって吐出量、吐出圧力が制御されるものであるため、油圧シリンダ２０との直列ライン中に、方向切換弁、圧力制御弁、流量制御弁を必要としないシンプルな油圧制御回路となっている。   The bi-directional rotary pump mechanism 11 can supply pressure oil in both forward and reverse directions, the discharge direction of the pressure oil is selected according to the forward / reverse rotation direction, and the discharge amount and discharge pressure are controlled by controlling the rotation speed. Therefore, a simple hydraulic control circuit that does not require a direction switching valve, a pressure control valve, and a flow rate control valve in the series line with the hydraulic cylinder 20 is provided.

双方向回転ポンプ機構１１は、第１と第２の吐出側流路（１２Ｘ，１２Ｙ）からそれぞれ分岐した第１のパイロット流路１３Ｘおよび第２のパイロット流路１３Ｙと、これらパイロット流路によって各吐出口から作動油の一部がパイロット圧力として導かれる電磁切換弁１６を介して斜板式の可変容量機構１７が接続されている。   The bidirectional rotary pump mechanism 11 includes a first pilot flow path 13X and a second pilot flow path 13Y branched from the first and second discharge side flow paths (12X, 12Y), respectively. A swash plate type variable displacement mechanism 17 is connected through an electromagnetic switching valve 16 through which a part of the hydraulic oil is introduced as a pilot pressure from the discharge port.

この容量可変機構１７は、受圧部１８がパイロット圧力に応じて斜板１９に対して押し引きを行うことにより斜板１９の傾斜角度を変えて双方向回転ポンプ機構１１の押し出し容量を変位させるものである。   The capacity variable mechanism 17 is a mechanism in which the pressure receiving portion 18 pushes and pulls the swash plate 19 in accordance with the pilot pressure to change the tilt angle of the swash plate 19 to displace the pushing capacity of the bidirectional rotary pump mechanism 11. It is.

具体的には、図２（ａ）に示すように、電磁切換弁１６が第２の回路接続としてポートＰＡ接続（ポートＢプラグ）を形成した状態にて、双方向回転ポンプ機構１１から第１の吐出側流路１２Ｘ又は第２の吐出側流路１２Ｙから一部の自己圧が第１のパイロット流路１３Ｘまたは第２のパイロット流路１３Ｙを介して導かれてなるパイロット圧力が受圧部１８へ作用し、該受圧部１８が斜板１９を押圧してその傾斜角度を小さくし、双方向回転ポンプ機構１１の吐出量が小容量側に切り換えられる。 Specifically, as shown in FIG. 2A, in the state where the electromagnetic switching valve 16 forms the port PA connection (port B plug) as the second circuit connection, the bidirectional rotary pump mechanism 11 makes the first The pilot pressure obtained by introducing a part of the self-pressure from the discharge side flow path 12X or the second discharge side flow path 12Y through the first pilot flow path 13X or the second pilot flow path 13Y is the pressure receiving portion 18. The pressure receiving portion 18 presses the swash plate 19 to reduce the inclination angle, and the discharge amount of the bidirectional rotary pump mechanism 11 is switched to the small capacity side.

また、電磁切換弁１６が第１の回路接続としてポートＢＴ接続（ポートＡプラグ）を形成した状態にて、パイロット圧油の導入を止めることによってパイロット圧力が小さくなっていく。これに従って受圧部１８への作用が軽減され、斜板１９に対する押圧が解除されつつ傾斜角度が大きくなり、双方向回転ポンプ機構１１の吐出量が大容量側に切り換えられる。 In addition, in a state where the electromagnetic switching valve 16 forms the port BT connection (port A plug) as the first circuit connection, the pilot pressure is reduced by stopping the introduction of the pilot pressure oil. Accordingly, the action on the pressure receiving portion 18 is reduced, the inclination angle is increased while the pressure on the swash plate 19 is released, and the discharge amount of the bidirectional rotary pump mechanism 11 is switched to the large capacity side.

また、本実施例においては、図２（ｂ）に示す大容量側の第１の回路接続を形成しているときに受圧部１８側から第１の吐出側流路１２Ｘまたは第２の吐出側流路１２Ｙへの液体の流出を阻止して受圧部１８に作用しているパイロット圧力を封じ込める液体流出阻止手段として、第１のパイロット流路１３Ｘ中および第２のパイロット流路１３Ｙ中のそれぞれに逆止弁（１４Ｘ，１４Ｙ）を配置した。 Further, in this embodiment, when the first circuit connection on the large capacity side shown in FIG. 2B is formed, the first discharge side flow path 12X or the second discharge side from the pressure receiving portion 18 side. As a liquid outflow prevention means for preventing the liquid outflow to the flow path 12Y and containing the pilot pressure acting on the pressure receiving portion 18, it is provided in each of the first pilot flow path 13X and the second pilot flow path 13Y. Check valves (14X, 14Y) were arranged.

これによって、容量可変機構１７を小容量側に切り換えた際に、双方向回転ポンプ機構１１の吐出し圧力が最低調整圧力以下となっても、この逆止弁（１４Ｘ，１４Ｙ）により封じ込められたパイロット圧力が受圧部１８に作用し続けることができるため、低圧領域でも安定な制御状態が維持できる。   As a result, when the capacity variable mechanism 17 is switched to the small capacity side, even if the discharge pressure of the bidirectional rotary pump mechanism 11 is less than the minimum adjustment pressure, it is contained by the check valves (14X, 14Y). Since the pilot pressure can continue to act on the pressure receiving portion 18, a stable control state can be maintained even in a low pressure region.

さらに、これら第１と第２のパイロット流路（１３Ｘ，１３Ｙ）には、各逆止弁（１４Ｘ，１４Ｙ）よりも電磁切換弁１６寄りに絞り弁１５をショックレス機構として設けることにより、容量可変機構１７での切換時における挙動を低減できるものとした。   Further, in these first and second pilot flow paths (13X, 13Y), a throttle valve 15 is provided as a shockless mechanism closer to the electromagnetic switching valve 16 than the check valves (14X, 14Y), thereby providing a capacity. The behavior at the time of switching with the variable mechanism 17 can be reduced.

以上の構成により、流量制御時にはポンプ容量を大容量とすることができると共に、高圧を要する圧力制御時には大容量から小容量へ切り換えることができるため、モータに係る負荷トルクを小さく抑えることができ、ポンプに装備されるモータは小型のもので済み、装置構成の大型化を防いで効率的な可変容量形双方向回転ポンプが得られる。   With the above configuration, the pump capacity can be increased during flow control, and can be switched from large capacity to small capacity during pressure control that requires high pressure, so the load torque associated with the motor can be kept small. The motor installed in the pump can be small, and an efficient variable capacity bidirectional rotary pump can be obtained without increasing the size of the apparatus.

また、上記構成の可変容量形双方向回転ポンプは、油圧シリンダ２０への圧油導入における電磁切換弁１６によるポート接続の変更を他の仕様に適用した回路構成に容易に変更できる。例えば、切換弁１６による容量可変機構１７の変位を、高速切換形と高圧切換形との切換とするなど、所望の回路構成を容易に得ることができる。   In the variable displacement bidirectional rotary pump having the above-described configuration, the port connection change by the electromagnetic switching valve 16 in introducing the pressure oil to the hydraulic cylinder 20 can be easily changed to a circuit configuration applied to other specifications. For example, it is possible to easily obtain a desired circuit configuration such that the displacement of the variable capacity mechanism 17 by the switching valve 16 is switched between a high-speed switching type and a high-pressure switching type.

例えば、容量可変機構１７を小容量側に変位させるための電磁切換弁１６による第２の回路接続の形成（図２（ａ））を、油圧シリンダへの圧油導入流量制御における低速から高速側への変位とし、容量可変機構を大容量側に変位させるために受容部を低圧側流路に接続する前記切換弁による第１の回路接続の形成（図２（ｂ））を、油圧シリンダへの圧油導入圧力制御における低圧から高圧側への変位とすることができる。   For example, the formation of the second circuit connection (FIG. 2 (a)) by the electromagnetic switching valve 16 for displacing the capacity variable mechanism 17 to the small capacity side is changed from the low speed to the high speed side in the control flow of pressure oil introduced into the hydraulic cylinder. In order to displace the variable capacity mechanism toward the large capacity side, the first circuit connection is formed by the switching valve that connects the receiving part to the low pressure side flow path (FIG. 2B) to the hydraulic cylinder. The displacement from the low pressure to the high pressure side in the pressure oil introduction pressure control.

なお、本発明による可変容量形双方向回転ポンプは、上記図２に示すような油圧回路に限らず、各種油圧制御システムに用いることができる。例えば図３（ａ）に示すような油圧シリンダ室内のヘッド側容積とロッド側容積との差が大きいなど、慣性負荷等の反制御方向に負荷が作用する場合に対応した双方向回転ポンプの回転数制御システム用の油圧回路、また図３（ｂ）に示すように両側ロッドシリンダの使用に対応した双方向回転ポンプの回転数制御システム用の油圧回路、また図３（ｃ）に示す双方向回転ポンプの回転数制御システムにおいて、正逆回転方向の切換時の応答性改善を目的とした油圧回路、さらには図３（ｄ）に示すような油圧シリンダのヘッド側室内に一方向負荷が作用する場合に対応した双方向回転ポンプの回転数制御システム用の油圧回路等、各種油圧回路に用いてシンプルな油圧制御システムを構成することができる。   The variable displacement bidirectional rotary pump according to the present invention is not limited to the hydraulic circuit as shown in FIG. 2 but can be used in various hydraulic control systems. For example, the rotation of the bi-directional rotary pump corresponding to a case where a load acts in a counter-control direction such as an inertia load, such as a large difference between the head side volume and the rod side volume in the hydraulic cylinder chamber as shown in FIG. The hydraulic circuit for the number control system, the hydraulic circuit for the rotational speed control system of the bidirectional rotary pump corresponding to the use of the double rod cylinder as shown in FIG. 3 (b), and the bidirectional circuit shown in FIG. 3 (c). In the rotational speed control system of the rotary pump, a one-way load is applied to the hydraulic circuit for the purpose of improving the responsiveness at the time of switching between the forward and reverse rotational directions, and further to the head side chamber of the hydraulic cylinder as shown in FIG. A simple hydraulic control system can be configured using various hydraulic circuits such as a hydraulic circuit for a rotational speed control system of a bidirectional rotary pump corresponding to the case.

本発明の一実施形態によるに可変容量形双方向回転ポンプの概略構成回路図である。1 is a schematic circuit diagram of a variable displacement bidirectional rotary pump according to an embodiment of the present invention. 本発明の一実施例による図１に示した可変容量形双方向回転ポンプを用いた油圧制御システムを示す油圧回路図であり、（ａ）は容量可変機構の小容量側への変位状態を示す油圧回路図であり、（ｂ）は容量可変機構の大容量側への変位状態を示す油圧回路図である。FIG. 2 is a hydraulic circuit diagram showing a hydraulic control system using the variable displacement bidirectional rotary pump shown in FIG. 1 according to an embodiment of the present invention, wherein (a) shows a displacement state of the variable capacity mechanism toward the small capacity side. It is a hydraulic circuit diagram, (b) is a hydraulic circuit diagram showing a displacement state to the large capacity side of the capacity variable mechanism. 図１に示した可変容量形双方向回転ポンプを用いた他の油圧制御システムを例示する油圧回路図であり、（ａ）は油圧シリンダ室内のヘッド側容積とロッド側容積との差が大きくて慣性負荷が作用する場合に対応した双方向回転ポンプの回転数制御システム用油圧回路図であり、（ｂ）は両側ロッドシリンダの使用した場合に対応した双方向回転ポンプの回転数制御システム用の油圧回路図であり、（ｃ）は正逆回転方向の切換時の応答性改善を目的とした双方向回転ポンプの回転数制御システム用油圧回路図であり、（ｄ）は油圧シリンダのヘッド側室内に一方向負荷が作用する場合に対応した双方向回転ポンプの回転数制御システム用の油圧回路図である。FIG. 2 is a hydraulic circuit diagram illustrating another hydraulic control system using the variable displacement bidirectional rotary pump shown in FIG. 1, wherein (a) shows a large difference between a head side volume and a rod side volume in a hydraulic cylinder chamber. It is a hydraulic circuit diagram for the rotational speed control system of the bidirectional rotary pump corresponding to the case where the inertial load is applied, and (b) is for the rotational speed control system of the bidirectional rotary pump corresponding to the case where the double-sided rod cylinder is used. It is a hydraulic circuit diagram, (c) is a hydraulic circuit diagram for a rotational speed control system of a bi-directional rotary pump for the purpose of improving responsiveness at the time of switching between forward and reverse rotational directions, (d) is a hydraulic cylinder head side It is a hydraulic circuit diagram for the rotational speed control system of the bidirectional rotary pump corresponding to the case where a unidirectional load acts on the room. 従来の双方向回転ポンプを用いた油圧制御システムの一例を示す油圧回路図である。It is a hydraulic circuit diagram which shows an example of the hydraulic control system using the conventional bidirectional | two-way rotary pump.

符号の説明Explanation of symbols

１，１１：双方向回転ポンプ機構
２Ｘ，１２Ｘ：第１の吐出側流路
２Ｙ，１２Ｙ：第２の吐出側流路
３Ｘ，１３Ｘ：第１のパイロット流路
３Ｙ，１３Ｙ：第２のパイロット流路
４Ｘ，４Ｙ，１４Ｘ，１４Ｙ：逆止弁
５，１５：絞り弁
６，１６：電磁切換弁
７，１７：容量可変機構
８，１８：受圧部
９，１９：斜板
２０：油圧シリンダ 1, 11: Bidirectional rotary pump mechanism 2X, 12X: First discharge flow path 2Y, 12Y: Second discharge flow path 3X, 13X: First pilot flow path 3Y, 13Y: Second pilot flow Paths 4X, 4Y, 14X, 14Y: Check valve 5, 15: Throttle valve 6, 16: Electromagnetic switching valve 7, 17: Variable displacement mechanism 8, 18: Pressure receiving portion 9, 19: Swash plate 20: Hydraulic cylinder

Claims (4)

２つの液体吐出口を有し、原動機による回転駆動で液体を吸引し、且つその液体を回転方向によって選択的に特定される前記２つの吐出口のうちのいずれかから吐出する双方向回転ポンプ機構と、
受圧部に作用するパイロット圧力の増減に応じて機械的に変位することにより前記ポンプ機構の単位回転当たりの吐出容量を変化させる容量可変機構と、
該容量可変機構を大容量側に変位させるときは前記受圧部を低圧側流路に接続して前記パイロット圧力を低下させる第１の回路接続を形成すると共に容量可変機構を小容量側に変位させるときは前記パイロット圧力として前記ポンプ機構の自己の吐出圧力を前記受圧部に導く第２の回路接続を形成する切換弁と、を備え、
前記切換弁が第２の回路接続を形成しているときに前記受圧部側から前記ポンプ機構の２つの吐出口にそれぞれ連通する第１と第２の吐出側流路への液体の流出を阻止して前記受圧部に作用しているパイロット圧力を封じ込める液体流出阻止手段をさらに備えていることを特徴とする可変容量形双方向回転ポンプ。 A bi-directional rotary pump mechanism having two liquid discharge ports, sucking liquid by rotational driving by a prime mover, and discharging the liquid selectively from either of the two discharge ports specified by the rotation direction When,
A capacity variable mechanism that changes the discharge capacity per unit rotation of the pump mechanism by mechanically displacing in accordance with the increase or decrease of the pilot pressure acting on the pressure receiving portion;
When the variable capacity mechanism is displaced to the large capacity side, the pressure receiving portion is connected to the low pressure side flow path to form a first circuit connection for lowering the pilot pressure, and the variable capacity mechanism is displaced to the small capacity side. A switching valve that forms a second circuit connection that guides the discharge pressure of the pump mechanism as the pilot pressure to the pressure receiving part .
When the switching valve forms the second circuit connection, the liquid is prevented from flowing out from the pressure receiving portion side to the first and second discharge side flow paths communicating with the two discharge ports of the pump mechanism, respectively. A variable displacement bidirectional rotary pump , further comprising a liquid outflow prevention means for containing the pilot pressure acting on the pressure receiving portion . 前記液体流出阻止手段が、前記受圧部からの前記第１および第２の吐出側流路への液体の逆流を阻止する逆止弁によって構成されていることを特徴とする請求項１に記載の可変容量形双方向回転ポンプ。 The liquid outflow blocking means, according to claim 1, characterized in that it is constituted by a check valve to prevent backflow of liquid into said first and second discharge-side flow path from the pressure receiving portion Variable displacement bidirectional rotary pump. 前記ポンプ機構の第１と第２の吐出側流路から分岐して一部の自己圧をパイロット圧力として前記切換弁に導入するパイロット流路中に、絞り弁を配置したことを特徴とする請求項２に記載の可変容量形双方向回転ポンプ。 A throttle valve is disposed in a pilot flow path that branches from the first and second discharge flow paths of the pump mechanism and introduces a part of the self-pressure as a pilot pressure to the switching valve. Item 3. The variable displacement bidirectional rotary pump according to Item 2. 前記可変容量形双方向回転ポンプからアクチュエータ駆動用油圧シリンダへ圧油を導入する油圧回路であって、
前記容量可変機構を小容量側に変位させるための前記切換弁による第２の回路接続の形成が、前記油圧シリンダへの圧油導入流量制御における高速側への変位となり、前記容量可変機構を大容量側に変位させるための第１の回路接続の形成が、前記油圧シリンダへの圧油導入圧力制御における高圧側への変位となることを特徴とする前記請求項１〜３の何れかに記載の可変容量形双方向回転ポンプを用いた油圧回路。 A hydraulic circuit for introducing pressure oil from the variable displacement bidirectional rotary pump to a hydraulic cylinder for driving an actuator;
The formation of the second circuit connection by the switching valve for displacing the variable capacity mechanism to the small capacity side results in the displacement to the high speed side in the flow control of the pressure oil introduction to the hydraulic cylinder, and the large capacity variable mechanism is increased. forming the first circuit connection for displacing the capacity side, according to any of the claims 1-3, characterized in that the displacement of the high pressure side of the hydraulic oil introduced pressure control to the hydraulic cylinder Hydraulic circuit using a variable displacement bidirectional rotary pump.
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JP2007138894A (en) 2007-06-07
CN1971042B (en) 2010-07-28

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