JPH04347381A - Power recovery system of hydraulic mechanism - Google Patents
Power recovery system of hydraulic mechanismInfo
- Publication number
- JPH04347381A JPH04347381A JP11716991A JP11716991A JPH04347381A JP H04347381 A JPH04347381 A JP H04347381A JP 11716991 A JP11716991 A JP 11716991A JP 11716991 A JP11716991 A JP 11716991A JP H04347381 A JPH04347381 A JP H04347381A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- pump
- tandem mechanism
- tandem
- power recovery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000011084 recovery Methods 0.000 title claims abstract description 18
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 2
- 230000009747 swallowing Effects 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、パワーユニット等の液
圧機構に利用される動力回収装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power recovery device used in a hydraulic mechanism such as a power unit.
【０００２】0002
【従来の技術】例えば、パワーユニットの一つであるフ
ォークリフトは、ポンプ／モータから吐出される圧液で
シリンダを駆動し得るように構成されている。このうち
、ポンプ／モータが直流電動機に接続され、この直流電
動機がバッテリで駆動されるように構成されたものでは
、バッテリの放電時期を引き伸ばすための工夫が必要に
なる。そこで、従来は図３に示すように、パワーシリン
ダ等を駆動して負荷を上昇、下降させる役割を担うポン
プ／モータＣに直流機Ｍを接続し、ポンプ／モータＣが
図中Ｘ方向に正回転してポンプ作用を営むときは直流機
Ｍを電動機として使用し、ポンプ／モータＣが図中−Ｘ
方向に逆回転してモータ作用を営むときは直流機Ｍを発
電機として使用することにより、負荷のエネルギを取り
込んでバッテリを適時充電できるようにしている。2. Description of the Related Art For example, a forklift, which is one of the power units, is constructed so that a cylinder can be driven by pressurized fluid discharged from a pump/motor. Among these, in the case where the pump/motor is connected to a DC motor and the DC motor is driven by a battery, it is necessary to take measures to extend the discharge period of the battery. Therefore, conventionally, as shown in Figure 3, a DC machine M is connected to a pump/motor C that plays the role of driving a power cylinder or the like to raise and lower the load, and the pump/motor C is rotated in the X direction in the figure. When rotating to perform a pumping action, the DC machine M is used as an electric motor, and the pump/motor C is connected to -X in the diagram.
When the motor operates by rotating in the opposite direction, the direct current machine M is used as a generator so that the energy of the load can be taken in and the battery can be charged in a timely manner.
【０００３】0003
【発明が解決しようとする課題】ところが、このような
従来の動力回収装置では、ポンプ／モータＣが容積の一
定したものであるため、要求される流量に応じて１回転
あたりのポンプ吐出容積Ｑが決まると、動力回収時にも
それに等しい呑み込み容積Ｑでポンプ／モータＣにモー
タ作用を営ませる以外にない。このため、電動機Ｍの回
転数を上げて動力回収時の回収効率を向上させることが
出来ないという問題がある。However, in such a conventional power recovery device, since the pump/motor C has a constant volume, the pump discharge volume Q per rotation varies depending on the required flow rate. Once this is determined, there is no choice but to have the pump/motor C operate with a swallowing volume Q that is equal to the swallowed volume Q during power recovery. For this reason, there is a problem in that it is not possible to increase the rotation speed of the electric motor M to improve recovery efficiency during power recovery.
【０００４】本発明は、簡単な構成により、このような
課題を解決することを目的としている。The present invention aims to solve these problems with a simple configuration.
【０００５】[0005]
【課題を解決するための手段】本発明は、かかる目的を
達成するために、次のような構成を採用したものである
。[Means for Solving the Problems] In order to achieve the above object, the present invention employs the following configuration.
【０００６】すなわち、本発明に係る液圧機構の動力回
収装置は、２以上のポンプ／モータを同軸上において連
結したタンデム機構と、このタンデム機構に接続されタ
ンデム機構が正回転してポンプ作用を営むときは電動機
として機能しタンデム機構が逆回転してモータ作用を営
むときは発電機として機能する直流機と、前記タンデム
機構の正回転時に各ポンプ／モータから均等に圧液を吐
出させ逆回転時に一部のポンプ／モータにのみ圧液を呑
み込ませる切換回路とを具備してなることを特徴とする
。That is, the power recovery device for a hydraulic mechanism according to the present invention includes a tandem mechanism in which two or more pumps/motors are coaxially connected, and a tandem mechanism connected to the tandem mechanism that rotates in the forward direction to perform a pumping action. When the tandem mechanism rotates in the opposite direction, it functions as an electric motor, and when the tandem mechanism operates in the forward direction, it functions as a generator.When the tandem mechanism rotates forward, pressure fluid is discharged evenly from each pump/motor and the tandem mechanism rotates in reverse. It is characterized in that it is equipped with a switching circuit that sometimes causes only some of the pumps/motors to swallow pressurized liquid.
【０００７】[0007]
【作用】このような構成により、要求される流量に応じ
てタンデム機構がポンプ作用を営むときの１回転あたり
の吐出容積が決まると、タンデム機構がモータ作用を営
むときの１回転あたりの呑み込み容積はその吐出容積よ
りも小さいものとなる。このため、全ポンプ／モータが
均等に圧液を呑み込んでモータ作用を営む場合に比べて
、同量の呑み込み量を消化するためにタンデム機構はよ
り高回転で回転駆動されることになる。この結果、発電
時の直流機の回転数が上がり、これに比例して発電出力
が増加することになる。[Operation] With this configuration, if the discharge volume per rotation when the tandem mechanism performs a pump action is determined according to the required flow rate, the swallowed volume per revolution when the tandem mechanism performs a motor action is determined. is smaller than its discharge volume. For this reason, compared to a case where all the pumps/motors equally swallow pressurized liquid to operate the motor, the tandem mechanism is driven to rotate at a higher rotation speed in order to absorb the same amount of liquid. As a result, the rotational speed of the DC machine during power generation increases, and the power generation output increases in proportion to this.
【０００８】[0008]
【実施例】以下、本発明の一実施例を図面を参照して説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【０００９】この実施例に係る液圧機構の動力回収装置
は、図１に示すように、一対のポンプ／モータＡ、Ｂを
同軸上において連結した構造のタンデム機構１と、この
タンデム機構１に接続されタンデム機構１が図中Ｘ方向
に正回転してポンプ作用を営むときは電動機として機能
しタンデム機構１が図中−Ｘ方向に逆回転してモータ作
用を営むときは発電機として機能する直流機Ｍとを備え
ている。そして、これらのポンプ／モータＡ、Ｂに切換
回路２を接続している。切換回路２は、前記タンデム機
構１の両ポンプ／モータＡ、Ｂを共通の吸込口ＩＮおよ
び吐出口ＯＵＴに並列に接続するとともに、ポンプ／モ
ータＢから吐出口ＯＵＴに向かう流路２ａの途中に正回
転時のみに流体の流れを許容する逆止弁２ｂを設けてい
る。また、この逆止弁２ｂを設けると、タンデム機構１
が逆回転した時にポンプ／モータＢへの圧液の流れが阻
止されることになるが、この際にポンプモータＢはポン
プ／モータＡとともに同期回転するため、引きづり抵抗
が増大するとともに回路やポンプ／モータの破損等につ
ながる恐れがある。そこで、ポンプ／モータＢの吐出側
と吸込側とを逆止弁２ｃを有した短絡回路２ｄによって
接続し、ここで流体が無負荷に近い状態で自己循環し得
るようにしている。As shown in FIG. 1, the power recovery device for a hydraulic mechanism according to this embodiment includes a tandem mechanism 1 having a structure in which a pair of pumps/motors A and B are coaxially connected, and a tandem mechanism 1 that is connected to the tandem mechanism 1. When the tandem mechanism 1 is connected and rotates forward in the X direction in the figure and performs a pump action, it functions as an electric motor, and when the tandem mechanism 1 rotates backward in the -X direction in the figure and performs a motor action, it functions as a generator. It is equipped with a DC machine M. A switching circuit 2 is connected to these pumps/motors A and B. The switching circuit 2 connects both pumps/motors A and B of the tandem mechanism 1 in parallel to a common suction port IN and a common discharge port OUT, and also connects the pumps/motors A and B of the tandem mechanism 1 in parallel to a common suction port IN and a discharge port OUT. A check valve 2b is provided that allows fluid to flow only during forward rotation. Moreover, if this check valve 2b is provided, the tandem mechanism 1
When the pump/motor B rotates in the opposite direction, the flow of pressure fluid to the pump/motor B is blocked, but since the pump/motor B rotates synchronously with the pump/motor A, the drag resistance increases and the circuit and This may lead to damage to the pump/motor. Therefore, the discharge side and the suction side of the pump/motor B are connected by a short circuit 2d having a check valve 2c, so that the fluid can self-circulate in a state close to no load.
【００１０】このような構成からなる本装置を、例えば
フォークリフトに適用し、先ず直流機Ｍを電動機として
作動させると、前記タンデム機構１が正回転して吸込口
ＩＮから図示矢印（実線）に沿って両ポンプ／モータＡ
、Ｂに吸い込んだ流体を圧液として吐出口ＯＵＴから吐
出することになる。次に、負荷のエネルギを吸収して動
力回収する場合は、吐出口ＯＵＴの負荷圧力によってタ
ンデム機構１のポンプ／モータＡが逆回転方向に駆動さ
れ、吐出口ＯＵＴから流入した圧液を図示矢印（破線）
に沿ってこのポンプ／モータＡに呑み込み、吸込口ＩＮ
に排出することになる。また、排出された流体の一部は
短絡回路２ｄに流入し、逆止弁２ｃを介してポンプ／モ
ータＢに流れた後、再び吐出口ＯＵＴへ向かう流れに合
流して自己循環を繰り返す。When this device having such a configuration is applied to, for example, a forklift and the DC machine M is first operated as an electric motor, the tandem mechanism 1 rotates in the forward direction from the suction port IN along the arrow (solid line) shown in the figure. Both pumps/motor A
, B will be discharged from the discharge port OUT as a pressure liquid. Next, when power is recovered by absorbing the energy of the load, the pump/motor A of the tandem mechanism 1 is driven in the reverse rotation direction by the load pressure at the discharge port OUT, and the pressurized liquid flowing from the discharge port OUT is (dashed line)
into this pump/motor A along the suction port IN
It will be discharged to Further, a part of the discharged fluid flows into the short circuit 2d, flows to the pump/motor B via the check valve 2c, and then joins the flow toward the discharge port OUT again to repeat self-circulation.
【００１１】しかして、この構成において正回転時の１
回転あたりの吐出口ＯＵＴからの吐出量Ｑを図３に示し
た従来の動力回収装置の吐出量Ｑに等しく設定すると、
各々のポンプ／モータＡ、Ｂが受け持つ吐出容積はそれ
ぞれＱ／２になり、逆回転時はこの容積Ｑ／２でポンプ
／モータＡのみが全容量Ｑをまかなわなければならなく
なる（ポンプ／モータＢはモータとして作用しない）。
しかし、このときポンプ／モータＢを通過する流体は無
負荷に近い状態で自己循環するため、直流機Ｍにかかる
引きづり抵抗は軽減されている。このため、負荷が等し
ければタンデム機構１は２倍の回転数で回転できること
になる。この結果、この動力回収装置を利用すると、直
流機１において従来の約２倍の発電量を得ることができ
、上述したフォークリフトがバッテリ駆動方式である場
合等にバッテリ放電時期を有効に引き伸ばすことが可能
になる。[0011] However, in this configuration, 1 during forward rotation
If the discharge amount Q from the discharge port OUT per revolution is set equal to the discharge amount Q of the conventional power recovery device shown in FIG.
The discharge volume handled by each pump/motor A and B is Q/2, and during reverse rotation, only pump/motor A has to cover the entire volume Q with this volume Q/2 (pump/motor B does not act as a motor). However, at this time, the fluid passing through the pump/motor B self-circulates under almost no load, so the drag resistance applied to the DC machine M is reduced. Therefore, if the loads are equal, the tandem mechanism 1 can rotate at twice the rotation speed. As a result, by using this power recovery device, it is possible to obtain approximately twice the amount of power generated by the DC machine 1 compared to the conventional one, and it is possible to effectively extend the battery discharge period when the above-mentioned forklift is a battery-driven type. It becomes possible.
【００１２】なお、本発明は上記実施例のみに限定され
るものではない。例えば、図２に示す動力回収装置を構
成する切換回路３は、一対のポンプ／モータＡ、Ｂを共
通の吸込口ＩＮおよび吐出口ＯＵＴに並列に接続し逆止
弁３ａを設けた点で前記実施例と同様であるが、この装
置は短絡回路を設ける代わりにタンデム機構１のポンプ
／モータＡ、Ｂをワンウェイクラッチ４を介して連結し
ている。すなわち、このワンウェイクラッチ４は図中Ｘ
方向に正回転する時のみ動力伝達を行い、図中−Ｘ方向
に逆回転する時は空転するように構成されたもので、逆
回転時にはポンプ／モータＢを回転させないようにして
いる。このような構成によっても、前記実施例と全く同
様の作用効果を得ることができる。また、図１および図
２の実施例はポンプ／モータＡ、Ｂの容積比を１：１に
設定したが、これらを互いに異ならせた場合には、動力
回収効率を直流機の特性に応じて従来比で２倍以上ある
いは２倍未満の適宜の値に設定することが可能になる。
さらに、タンデム機構を構成するポンプ／モータの数を
３個以上とすることもでき、その他、切換機構の構成な
ども本発明の趣旨を逸脱しない範囲で種々変形が可能で
ある。It should be noted that the present invention is not limited to the above embodiments. For example, the switching circuit 3 constituting the power recovery device shown in FIG. Although similar to the embodiment, this device connects the pump/motors A and B of the tandem mechanism 1 via a one-way clutch 4 instead of providing a short circuit. That is, this one-way clutch 4 is
The pump/motor B is configured to transmit power only when rotating in the forward direction, and idle when rotating in the -X direction in the figure, so that the pump/motor B does not rotate during the reverse rotation. Even with such a configuration, the same effects as those of the embodiment described above can be obtained. In addition, in the embodiments shown in Figs. 1 and 2, the volume ratio of pump/motor A and B is set to 1:1, but if these are made different, the power recovery efficiency can be adjusted according to the characteristics of the DC machine. It becomes possible to set the value to an appropriate value that is more than twice or less than twice the conventional value. Furthermore, the number of pumps/motors constituting the tandem mechanism can be increased to three or more, and the configuration of the switching mechanism can also be modified in various ways without departing from the spirit of the present invention.
【００１３】[0013]
【発明の効果】本発明に係る液圧機構の動力回収装置は
、以上説明したように、シリンダ等を駆動するポンプ／
モータにタンデム機構を採用し、そのタンデム機構がポ
ンプとして機能する場合とモータとして機能する場合と
で容積比を異ならせた構成により、動力回収時の直流機
の回転数を従来に比べて高回転化し、高い動力回収効率
を実現できる効果が得られる。Effects of the Invention As explained above, the power recovery device for a hydraulic mechanism according to the present invention has a pump/
By adopting a tandem mechanism for the motor and having a configuration in which the volume ratio is different when the tandem mechanism functions as a pump and when it functions as a motor, the rotation speed of the DC machine during power recovery is higher than before. , and achieves the effect of realizing high power recovery efficiency.
【図面の簡単な説明】[Brief explanation of the drawing]
【図１】本発明の一実施例を示す回路図。FIG. 1 is a circuit diagram showing one embodiment of the present invention.
【図２】本発明の他の実施例を示す図１に対応した回路
図。FIG. 2 is a circuit diagram corresponding to FIG. 1 showing another embodiment of the present invention.
【図３】従来例を示す図１および図２に対応した回路図
。FIG. 3 is a circuit diagram corresponding to FIGS. 1 and 2 showing a conventional example.
Ａ、Ｂ…ポンプ／モータ Ｍ…直流機 １…タンデム機構 ２、３…切換回路 A, B...Pump/motor M...DC machine 1...Tandem mechanism 2, 3...Switching circuit
Claims (1)
連結したタンデム機構と、このタンデム機構に接続され
タンデム機構が正回転してポンプ作用を営むときは電動
機として機能しタンデム機構が逆回転してモータ作用を
営むときは発電機として機能する直流機と、前記タンデ
ム機構の正回転時に各ポンプ／モータから均等に圧液を
吐出させ逆回転時に一部のポンプ／モータにのみ圧液を
呑み込ませる切換回路とを具備してなることを特徴とす
る液圧機構の動力回収装置。Claim 1: A tandem mechanism in which two or more pumps/motors are coaxially connected, and when the tandem mechanism connected to this tandem mechanism rotates in the forward direction to perform a pumping action, it functions as an electric motor and the tandem mechanism rotates in the reverse direction. When operating a motor, the tandem mechanism has a DC machine that functions as a generator, and when the tandem mechanism rotates in the forward direction, pressure fluid is discharged evenly from each pump/motor, and when the tandem mechanism rotates in the reverse direction, only some of the pumps/motors swallow the pressure fluid. A power recovery device for a hydraulic mechanism, characterized in that it is equipped with a switching circuit that allows
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11716991A JP2611566B2 (en) | 1991-05-22 | 1991-05-22 | Hydraulic power recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11716991A JP2611566B2 (en) | 1991-05-22 | 1991-05-22 | Hydraulic power recovery system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04347381A true JPH04347381A (en) | 1992-12-02 |
| JP2611566B2 JP2611566B2 (en) | 1997-05-21 |
Family
ID=14705154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11716991A Expired - Fee Related JP2611566B2 (en) | 1991-05-22 | 1991-05-22 | Hydraulic power recovery system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2611566B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1006143C2 (en) * | 1997-05-28 | 1998-12-01 | Innas Free Piston Bv | Hydraulic system with constant pressure in pressure line. |
| WO2006090655A1 (en) * | 2005-02-25 | 2006-08-31 | Mitsubishi Heavy Industries, Ltd. | Load handling regeneration method and load handling regeneration system of battery type industrial vehicle |
| WO2006090709A1 (en) * | 2005-02-25 | 2006-08-31 | Mitsubishi Heavy Industries, Ltd. | Load handling regeneration system for battery type industrial vehicle |
| US8642392B2 (en) | 2009-01-23 | 2014-02-04 | Nichia Corporation | Semiconductor device and production method therefor |
| US8679898B2 (en) | 2009-01-23 | 2014-03-25 | Nichia Corporation | Semiconductor device and production method therefor |
| US8836130B2 (en) | 2009-01-23 | 2014-09-16 | Nichia Corporation | Light emitting semiconductor element bonded to a base by a silver coating |
-
1991
- 1991-05-22 JP JP11716991A patent/JP2611566B2/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1006143C2 (en) * | 1997-05-28 | 1998-12-01 | Innas Free Piston Bv | Hydraulic system with constant pressure in pressure line. |
| WO1998054450A1 (en) * | 1997-05-28 | 1998-12-03 | Innas Free Piston B.V. | Hydraulic drive system with constant pressure in pressure conduit |
| WO2006090655A1 (en) * | 2005-02-25 | 2006-08-31 | Mitsubishi Heavy Industries, Ltd. | Load handling regeneration method and load handling regeneration system of battery type industrial vehicle |
| WO2006090709A1 (en) * | 2005-02-25 | 2006-08-31 | Mitsubishi Heavy Industries, Ltd. | Load handling regeneration system for battery type industrial vehicle |
| JPWO2006090655A1 (en) * | 2005-02-25 | 2008-07-24 | 三菱重工業株式会社 | Cargo handling and regeneration method for battery-powered industrial vehicles and cargo handling and regeneration system |
| JPWO2006090709A1 (en) * | 2005-02-25 | 2008-07-24 | 三菱重工業株式会社 | Battery-powered industrial vehicle cargo handling regeneration system |
| US7770696B2 (en) | 2005-02-25 | 2010-08-10 | Mitsubishi Heavy Industries, Ltd. | Energy recovering system of hydraulic lift device for battery operated industrial trucks |
| US7770697B2 (en) | 2005-02-25 | 2010-08-10 | Mitsubishi Heavy Industries, Ltd. | Energy recovering method and system in hydraulic lift device of battery operated industrial trucks |
| JP4681600B2 (en) * | 2005-02-25 | 2011-05-11 | 三菱重工業株式会社 | Battery-powered industrial vehicle cargo handling regeneration system |
| JP4727653B2 (en) * | 2005-02-25 | 2011-07-20 | 三菱重工業株式会社 | Cargo handling and regeneration method for battery-powered industrial vehicles and cargo handling and regeneration system |
| US8642392B2 (en) | 2009-01-23 | 2014-02-04 | Nichia Corporation | Semiconductor device and production method therefor |
| US8679898B2 (en) | 2009-01-23 | 2014-03-25 | Nichia Corporation | Semiconductor device and production method therefor |
| US8836130B2 (en) | 2009-01-23 | 2014-09-16 | Nichia Corporation | Light emitting semiconductor element bonded to a base by a silver coating |
| US8927341B2 (en) | 2009-01-23 | 2015-01-06 | Nichia Corporation | Semiconductor device and production method therefor |
| US9018664B2 (en) | 2009-01-23 | 2015-04-28 | Nichia Corporation | Semiconductor device and production method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2611566B2 (en) | 1997-05-21 |
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