JP6079976B2 - Gear pump or motor - Google Patents

Gear pump or motor Download PDF

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JP6079976B2
JP6079976B2 JP2015504028A JP2015504028A JP6079976B2 JP 6079976 B2 JP6079976 B2 JP 6079976B2 JP 2015504028 A JP2015504028 A JP 2015504028A JP 2015504028 A JP2015504028 A JP 2015504028A JP 6079976 B2 JP6079976 B2 JP 6079976B2
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driven
hydraulic
gear
drive shaft
shaft
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JPWO2014136186A1 (en
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次則 石中
次則 石中
信雄 向井
信雄 向井
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Shimadzu Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

本発明は、互いに噛み合うはすば歯車をそれぞれ利用した駆動歯車及び従動歯車からなる外接歯車対と、内部にこの外接歯車対を収納する歯車収納室を有するケーシングとを備えた歯車ポンプ又はモータに関する。   The present invention relates to a gear pump or a motor provided with an external gear pair composed of a drive gear and a driven gear each utilizing helical gears that mesh with each other, and a casing having a gear storage chamber for storing the external gear pair therein. .

従来より、互いに噛み合う駆動歯車と従動歯車とからなる外接歯車対と、この外接歯車対を収納する歯車収納室を内部に有するケーシングとを備える歯車ポンプ又はモータが広く用いられている。このような歯車ポンプ又はモータの駆動歯車及び従動歯車は、軸芯に平行な歯が周囲に形成されている平歯車が主流である。しかし、駆動歯車及び従動歯車に平歯車を使用する場合、以下のような問題が存在する。具体的には、駆動歯車の歯と従動歯車の歯とが噛み合う際には歯幅全域にわたって同時に噛み合う。また、駆動歯車の歯と従動歯車の歯との噛み合いを終了する際には歯幅全域にわたって同時に噛み合いを終了する。このことにより、騒音や振動が発生することがある。この問題を解決するために、駆動歯車と従動歯車としてはすば歯車を採用する工夫が提案されている（例えば、特許文献１参照）。   2. Description of the Related Art Conventionally, a gear pump or a motor including an external gear pair that includes a drive gear and a driven gear that mesh with each other and a casing that internally includes a gear storage chamber that stores the external gear pair has been widely used. The spur gear in which teeth parallel to the axis are formed around the drive gear and driven gear of such a gear pump or motor is the mainstream. However, when a spur gear is used for the drive gear and the driven gear, there are the following problems. Specifically, when the teeth of the drive gear and the teeth of the driven gear mesh with each other, they mesh simultaneously over the entire tooth width. Further, when the meshing between the teeth of the drive gear and the teeth of the driven gear is terminated, the meshing is simultaneously terminated over the entire tooth width. This can cause noise and vibration. In order to solve this problem, a contrivance has been proposed in which helical gears are used as the drive gear and the driven gear (see, for example, Patent Document 1).

このような歯車ポンプ又はモータは、例えば、以下に示すような構成を有する。すなわち、図４に示すように、互いに噛み合う駆動側はすば歯車Ｘ６及び従動側はすば歯車Ｘ７からなる外接歯車対Ｘ１と、この外接歯車対Ｘ１を収納する歯車収納室Ｘ２ａを内部に有するとともに前記駆動側はすば歯車Ｘ６を軸支する駆動軸Ｘ８及び前記従動側はすば歯車Ｘ７を軸支する従動軸Ｘ９を収納するための軸受を有するケーシングＸ２と、このケーシングＸ２内に収納され前記外接歯車対Ｘ１の各はすば歯車Ｘ６、Ｘ７の両側面Ｘ６ａ、Ｘ６ｂ、Ｘ７ａ、Ｘ７ｂにそれぞれ添接しそれぞれ対をなす側板を兼ねるリア側のベアリングケースＸ３ａ及びフロント側のベアリングケースＸ３ｂと、液圧室Ｘ４１ａ、Ｘ４１ｂを有しこの液圧室Ｘ４１ａ、Ｘ４１ｂに導入される液圧により前記駆動軸Ｘ８及び従動軸Ｘ９を反スラスト方向に押圧する液圧機構Ｘ４と、この液圧機構Ｘ４の液圧室Ｘ４１ａ、Ｘ４１ｂに高圧側から作動液を導く高圧作動液導入路Ｘ５とを具備してなる。前記ケーシングＸ２は、前記歯車収納室Ｘ２ａを有する筒状のボディＸ２３と、このボディＸ２３の前面側に装着されたフロントカバーＸ２２と、前記ボディＸ２３の背面側に装着されたリアカバーＸ２４とを有する。前記ボディＸ２３の内部には、一方の側板を兼ね駆動軸Ｘ８の後端側及び従動軸Ｘ９の後端側を軸支するリア側のベアリングケースＸ３ａと、他方の側板を兼ね駆動軸Ｘ８の前端側及び従動軸Ｘ９の前端側を軸支するリア側のベアリングケースＸ３ｂとを収納している。   Such a gear pump or motor has the following configuration, for example. That is, as shown in FIG. 4, an external gear pair X1 composed of a driving side helical gear X6 and a driven side helical gear X7, and a gear storage chamber X2a for storing the external gear pair X1 are internally provided. A casing X2 having a bearing for housing a drive shaft X8 for supporting the helical gear X6 on the driving side and a driven shaft X9 for supporting the driven helical gear X7 on the driving side is housed in the casing X2. And a rear-side bearing case X3a and a front-side bearing case X3b that serve as a pair of side plates that are in contact with both side surfaces X6a, X6b, X7a, and X7b of the helical gears X6 and X7, respectively. The hydraulic shafts X41a and X41b have hydraulic chambers X41a and X41b, and the drive shaft X8 and the driven shaft X9 are anti-thrusted by the hydraulic pressure introduced into the hydraulic chambers X41a and X41b. A hydraulic mechanism X4 for pressing, hydraulic chambers X41a of the hydraulic mechanism X4, formed by and a high-pressure hydraulic fluid introducing passage X5 for guiding hydraulic fluid from the high pressure side X41b. The casing X2 includes a cylindrical body X23 having the gear housing chamber X2a, a front cover X22 attached to the front side of the body X23, and a rear cover X24 attached to the rear side of the body X23. Inside the body X23, there is a bearing case X3a on the rear side that also serves as one side plate and the rear end side of the drive shaft X8 and the rear end side of the driven shaft X9, and the front end of the drive shaft X8 that also serves as the other side plate. And a rear bearing case X3b that pivotally supports the front end side of the driven shaft X9.

このような構成の歯車ポンプを運転している状態では、駆動側はすば歯車Ｘ６及び従動側はすば歯車Ｘ７に、回転トルクの分力によるスラスト荷重と液圧によるスラスト荷重とが発生する。これら回転トルクの分力によるスラスト荷重と液圧によるスラスト荷重とが合成された結果、図４に示すように、駆動側はすば歯車Ｘ６及び従動側はすば歯車Ｘ７に、それぞれ異なる大きさのスラスト荷重が、後方に向けて加えられる（以下、このスラスト荷重の方向を「スラスト方向」と呼び、その反対方向を「反スラスト方向」と呼ぶ）。   In a state where the gear pump having such a configuration is operated, a thrust load due to a component of rotational torque and a thrust load due to hydraulic pressure are generated on the driving side helical gear X6 and the driven side helical gear X7. . As a result of synthesizing the thrust load due to the component force of the rotational torque and the thrust load due to the hydraulic pressure, as shown in FIG. 4, the driving side has a helical gear X6 and the driven side has a different size. (Hereinafter, the direction of the thrust load is referred to as “thrust direction” and the opposite direction is referred to as “anti-thrust direction”).

リア側のベアリングケースＸ３ａは、前記スラスト荷重によって受ける面圧が大きくなるため、負荷を軽減させる目的で、駆動軸Ｘ８及び従動軸Ｘ９の後端側に前記液圧機構Ｘ４のバランスピストンＸ４３ａ、Ｘ４３ｂをそれぞれ接触させ、液圧力によりバランスさせている。この結果、バランスピストンＸ４３ａ、Ｘ４３ｂは液圧力に比例した押し付け力を前記スラスト荷重に対抗して作用させることが可能となる。   The bearing case X3a on the rear side receives a large surface pressure due to the thrust load. For the purpose of reducing the load, the balance pistons X43a and X43b of the hydraulic mechanism X4 are arranged on the rear end side of the drive shaft X8 and the driven shaft X9. Are brought into contact with each other and balanced by liquid pressure. As a result, the balance pistons X43a and X43b can apply a pressing force proportional to the fluid pressure against the thrust load.

しかし、前記液圧機構Ｘ４が駆動軸Ｘ８及び従動軸Ｘ９の後端側に前記液圧機構Ｘ４のバランスピストンＸ４３ａ、Ｘ４３ｂをそれぞれ接触させる構成を有することから、以下のような不具合が発生し得る。すなわち、このような構成では、駆動軸Ｘ８及び従動軸Ｘ９の回転につれてバランスピストンＸ４３ａ、Ｘ４３ｂとの間に摩擦が発生し、バランスピストンＸ４３ａ、Ｘ４３ｂが駆動軸Ｘ８及び従動軸Ｘ９から回転力の伝達を受けて回転することがある。その際に、バランスピストンＸ４３ａ、Ｘ４３ｂと駆動軸Ｘ８及び従動軸Ｘ９との間の摩擦や駆動軸Ｘ８及び従動軸Ｘ９の側面とケーシングとの間の摩擦に起因してメカロスが発生するという不具合が存在する。   However, since the hydraulic mechanism X4 has a configuration in which the balance pistons X43a and X43b of the hydraulic mechanism X4 are in contact with the rear ends of the drive shaft X8 and the driven shaft X9, the following problems may occur. . That is, in such a configuration, friction occurs between the balance pistons X43a and X43b as the drive shaft X8 and the driven shaft X9 rotate, and the balance pistons X43a and X43b transmit torque from the drive shaft X8 and the driven shaft X9. May rotate in response. At this time, there is a problem that mechanical loss occurs due to friction between the balance pistons X43a, X43b and the drive shaft X8 and the driven shaft X9 and friction between the side surfaces of the drive shaft X8 and the driven shaft X9 and the casing. Exists.

特表２０１２−５１９７９８号公報Special table 2012-519798 gazette

本発明は以上の点に着目したものであり、互いに噛み合う駆動側はすば歯車及び従動側はすば歯車からなる外接歯車対を備えた歯車ポンプ又はモータにおいて、ピストンを駆動軸及び従動軸に接触させた状態で駆動軸及び従動軸を反スラスト方向に押圧することに伴いメカロスが発生するという不具合を解消することを所期の目的とする。   The present invention focuses on the above points, and in a gear pump or motor having a pair of external gears composed of a helical gear on the driving side and a helical gear on the driven side that mesh with each other, the piston is used as the driving shaft and the driven shaft. The intended purpose is to eliminate the problem that mechanical loss occurs when the drive shaft and the driven shaft are pressed in the anti-thrust direction in the contacted state.

すなわち本発明に係る歯車ポンプ又はモータは、以下に述べるような構成を有する。すなわち本発明に係る歯車ポンプ又はモータは、互いに噛み合う駆動側はすば歯車及び従動側はすば歯車からなる外接歯車対と、この外接歯車対を収納する歯車収納室を内部に有するとともに前記駆動側はすば歯車を軸支する駆動軸及び前記従動側はすば歯車を軸支する従動軸を収納するための軸受を有するケーシングと、液圧室を有しこの液圧室に導入される液圧により前記駆動軸及び従動軸を反スラスト方向に押圧する液圧機構と、この液圧機構の液圧室に高圧側から作動液を導く高圧作動液導入路とを具備してなる歯車ポンプ又はモータであって、前記液圧機構が、前記駆動軸又は従動軸に対向し前記駆動側はすば歯車又は従動側はすば歯車と反対側に位置し内部に導入された作動液圧により前記駆動軸又は従動軸を反スラスト方向に押圧するための液圧室と、この液圧室内にスライド可能に嵌装されたシューとを備え、前記シューが、一部が前記液圧室内に配され液圧室の内壁に内接する主部と、この主部よりも大径でかつ前記主部よりも前記駆動軸又は従動軸に近い側に配された鍔部とを備えているとともに、前記シューが、このシューと前記駆動軸又は従動軸との間に形成される隙間に前記液圧室内から作動液を導入するためのオリフィスと、前記駆動軸又は従動軸に向かう面の外周部に形成され前記鍔部からさらに前記駆動軸又は従動軸に向けて突出したシールランドとを備えている。 That is, the gear pump or motor according to the present invention has the following configuration. That is, the gear pump or motor according to the present invention has an external gear pair composed of a driving side helical gear and a driven side helical gear meshing with each other, and a gear storage chamber for storing the external gear pair, and the drive. A casing having a drive shaft for supporting the helical gear on the side and a bearing for housing the driven shaft for supporting the driven helical gear on the driven side, and a hydraulic chamber are introduced into the hydraulic chamber. A gear pump comprising: a hydraulic mechanism that presses the drive shaft and the driven shaft in the anti-thrust direction by hydraulic pressure; and a high-pressure hydraulic fluid introduction passage that guides hydraulic fluid from the high-pressure side to the hydraulic pressure chamber of the hydraulic mechanism. Or a motor, wherein the hydraulic pressure mechanism is opposed to the drive shaft or the driven shaft, and the drive side is located on the opposite side of the helical gear or the driven side is located on the opposite side of the helical gear. The drive shaft or driven shaft in the anti-thrust direction A liquid chamber for pressurizing slidably a fitted to shoe to the hydraulic pressure chamber, wherein the shoe includes a main portion partially inscribed in the inside wall of the arranged are liquid chamber to the liquid pressure chamber And a flange portion that is larger in diameter than the main portion and disposed closer to the drive shaft or driven shaft than the main portion, and the shoe is connected to the shoe and the drive shaft or driven shaft. An orifice for introducing hydraulic fluid into the gap formed between the hydraulic chamber and an outer peripheral portion of the surface facing the drive shaft or driven shaft, and further from the flange portion to the drive shaft or driven shaft And a seal land protruding toward the surface.

このような構成によれば、前記液圧室内に導入された作動液圧のみにより前記駆動軸及び前記従動軸を反スラスト方向に押圧するようにしているので、ピストンを前記駆動軸又は前記従動軸に接触させることによる不具合の発生を防止することができる。その上で、前記駆動軸又は従動軸に向かう面の外周部に前記駆動軸又は従動軸に向けて突出したシールランドを設けていることにより、前記駆動軸又は従動軸の回転に伴いこのシールランドと前記駆動軸又は前記従動軸との空間に緩やかな圧力勾配を有する流体被膜が発生し、前記隙間の中央部に導入された液圧が保たれるので、この液圧機構をスラスト方向の軸受として利用することができる。   According to such a configuration, the drive shaft and the driven shaft are pressed in the anti-thrust direction only by the hydraulic fluid pressure introduced into the hydraulic pressure chamber, so that the piston is connected to the drive shaft or the driven shaft. It is possible to prevent the occurrence of problems due to contact with the. In addition, by providing a seal land protruding toward the drive shaft or the driven shaft on the outer peripheral portion of the surface toward the drive shaft or the driven shaft, the seal land is rotated along with the rotation of the drive shaft or the driven shaft. Since a fluid film having a gentle pressure gradient is generated in the space between the drive shaft and the driven shaft and the fluid pressure introduced into the central portion of the gap is maintained, this fluid pressure mechanism is used as a thrust bearing. Can be used as

本発明によれば、互いに噛み合う駆動側はすば歯車及び従動側はすば歯車からなる外接歯車対を備えた歯車ポンプ又はモータにおいて、ピストンを駆動軸及び従動軸に接触させた状態で駆動軸及び従動軸を反スラスト方向に押圧することに伴いメカロスが発生する不具合を解消することができる。   According to the present invention, in a gear pump or motor having a pair of external gears composed of a helical gear on the driving side and a helical gear on the driven side that mesh with each other, the driving shaft in a state where the piston is in contact with the driving shaft and the driven shaft. And the malfunction which mechanical loss generate | occur | produces by pressing a driven shaft to an anti-thrust direction can be eliminated.

本発明の一実施形態に係る歯車ポンプ又はモータを示す概略図。Schematic which shows the gear pump or motor which concerns on one Embodiment of this invention. 図１におけるＺ−Ｚ断面図。ZZ sectional drawing in FIG. 図１における要部の拡大図。The enlarged view of the principal part in FIG. 従来の歯車ポンプ又はモータを示す概略図。Schematic which shows the conventional gear pump or motor.

以下、本発明の一実施形態を、図面を参照して説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

本実施形態に係る歯車ポンプＰ１は、図１に示すように、互いに噛み合う駆動側はすば歯車６及び従動側はすば歯車７からなる外接歯車対１と、この外接歯車対１を収納する歯車収納室２ａを内部に有するとともに前記駆動側はすば歯車６を軸支する駆動軸８及び前記従動側はすば歯車７を軸支する従動軸９を収納するための軸受を有するケーシング２と、このケーシング２内に収納され前記外接歯車１対の各はすば歯車６、７の両側面６ａ、６ｂ、７ａ、７ｂにそれぞれ添接する対をなす後側板３ａ及び前側板３ｂと、液圧室４１ａ、４１ｂを有しこの液圧室４１ａ、４１ｂに導入される液圧により前記駆動軸８及び従動軸９を反スラスト方向に押圧する液圧機構４と、この液圧機構４の液圧室４１ａ、４１ｂに高圧側から作動液を導く高圧作動液導入路５とを具備する。   As shown in FIG. 1, the gear pump P <b> 1 according to the present embodiment accommodates an external gear pair 1 including a driving-side helical gear 6 and a driven-side helical gear 7 that mesh with each other, and the external gear pair 1. A casing 2 having a gear housing chamber 2a therein and a bearing for housing the drive shaft 8 that supports the helical gear 6 on the driving side and the driven shaft 9 that supports the helical gear 7 on the driven side. A rear plate 3a and a front plate 3b, which are housed in the casing 2 and make a pair respectively contacting the both side surfaces 6a, 6b, 7a, 7b of the helical gears 6, 7; A hydraulic mechanism 4 having pressure chambers 41a and 41b and pressing the drive shaft 8 and the driven shaft 9 in the anti-thrust direction by the hydraulic pressure introduced into the hydraulic chambers 41a and 41b; High pressure leading hydraulic fluid from the high pressure side to the pressure chambers 41a, 41b Comprising a hydraulic fluid introducing passage 5.

前記外接歯車対１を構成する駆動側はすば歯車６及び従動側はすば歯車７は、この種の歯車ポンプに用いられるものとして周知のはすば歯車である。ここで、前記駆動側はすば歯車６の歯及び従動側はすば歯車７の歯は、これらを噛み合わせた状態で歯車ポンプとして作動させる際に、回転トルクの分力により、駆動側はすば歯車６は後方に向かうスラスト荷重、従動側はすば歯車７は前方に向かうスラスト荷重をそれぞれ受ける。また、これら駆動側はすば歯車６及び従動側はすば歯車７は、歯車ポンプとして作動している状態で、液圧により、後方に向かうスラスト荷重をそれぞれ受ける。これら回転トルクの分力によるスラスト荷重と液圧によるスラスト荷重とが合成された結果、図２に示すように、駆動側はすば歯車６及び従動側はすば歯車７に、それぞれ異なる大きさのスラスト荷重が、後方に向けて加えられる。本実施形態では、前記駆動側はすば歯車６と駆動軸８とを一体に設けている。前記駆動軸８は、前記駆動側はすば歯車６の中心から回転軸心方向に延伸している。この駆動軸８は、一端がケーシング２の外部に延出している。また、従動側はすば歯車７と従動軸９とも一体に設けている。前記従動軸９は、前記従動側はすば歯車７の中心から回転軸心方向に延伸している。   The driving-side helical gear 6 and the driven-side helical gear 7 constituting the external gear pair 1 are helical gears that are well-known for use in this type of gear pump. Here, the teeth on the driving side of the helical gear 6 and the teeth on the driven side of the helical gear 7 are operated as a gear pump in a state where they are engaged with each other. The helical gear 6 receives a thrust load going backward, and the driven gear 7 receives a thrust load going forward. The helical gear 6 on the driving side and the helical gear 7 on the driven side receive thrust loads directed rearward by the hydraulic pressure while operating as a gear pump. As a result of the combination of the thrust load due to the component force of the rotational torque and the thrust load due to the hydraulic pressure, as shown in FIG. 2, the driving side is different in the helical gear 6 and the driven side is different in the helical gear 7. The thrust load is applied toward the rear. In the present embodiment, the drive side is provided with the helical gear 6 and the drive shaft 8 integrally. The drive shaft 8 extends from the center of the helical gear 6 on the drive side in the rotational axis direction. One end of the drive shaft 8 extends to the outside of the casing 2. Further, the driven side is provided integrally with the helical gear 7 and the driven shaft 9. The driven shaft 9 extends from the center of the driven helical gear 7 in the direction of the rotational axis.

ケーシング２は、前方に開口する歯車収納室２ａを有するボディ２１と、このボディ２１の前面側に装着されたフロントカバー２２と、前記ボディ２１の後面側に装着されたリアカバー２３とを備えている。   The casing 2 includes a body 21 having a gear storage chamber 2a that opens forward, a front cover 22 attached to the front side of the body 21, and a rear cover 23 attached to the rear side of the body 21. .

ボディ２１は、その内部に前記外接歯車対１すなわち駆動側はすば歯車６及び従動側はすば歯車７を噛合状態で収容する略眼鏡状の前記歯車収納室２ａと、この歯車収納室２ａを外部に連通させる図示しない作動液吸入口及び作動液吐出口２ｂとを備えており、筒状をなしている。   The body 21 has a substantially eyeglass-shaped gear housing chamber 2a for housing the external gear pair 1, that is, the driving-side helical gear 6 and the driven-side helical gear 7 in an engaged state, and the gear housing chamber 2a. Is provided with a hydraulic fluid suction port and a hydraulic fluid discharge port 2b (not shown) that communicate with the outside, and has a cylindrical shape.

前記フロントカバー２２は、ボディ２１にボルト等によって着脱可能に装着され、前記歯車収納室２ａの前側の開口面を閉塞する。また、このフロントカバー２２は、前記駆動軸８及び従動軸９の前端側を軸支する軸受２６を備えている。各軸受２６は、前記駆動軸８及び従動軸９の前端側がそれぞれ嵌入可能な軸受穴２６ｘと、この軸受穴２６ｘの内周に設けられ前記駆動軸８及び従動軸９をそれぞれ摺動可能に軸支するブッシュ２６ｙとを備えたものである。駆動軸８の前端は、前記軸受穴２６ｘを貫通してケーシング２の外部に突出させてある。   The front cover 22 is detachably attached to the body 21 with bolts or the like, and closes the opening surface on the front side of the gear housing chamber 2a. The front cover 22 includes a bearing 26 that pivotally supports the front end sides of the drive shaft 8 and the driven shaft 9. Each bearing 26 is provided with a bearing hole 26x in which the front end sides of the drive shaft 8 and the driven shaft 9 can be respectively fitted, and an inner periphery of the bearing hole 26x so that the drive shaft 8 and the driven shaft 9 can slide. A supporting bush 26y is provided. The front end of the drive shaft 8 passes through the bearing hole 26x and protrudes to the outside of the casing 2.

前記リアカバー２３も、ボディ２１にボルト等によって着脱可能に装着され、前記歯車収納室２ａの後側の開口面を閉塞する。また、前記このリアカバー２３は、前記駆動軸８及び従動軸９の後端側を軸支する軸受２５を備えている。各軸受２５は、前記駆動軸８及び従動軸９の後端側がそれぞれ嵌入可能な軸受穴２５ｘと、この軸受穴２５ｘの内周に設けられ前記駆動軸８及び従動軸９をそれぞれ摺動可能に軸支するブッシュ２５ｙとを備えたものである。   The rear cover 23 is also detachably attached to the body 21 with a bolt or the like, and closes the opening surface on the rear side of the gear housing chamber 2a. The rear cover 23 includes a bearing 25 that pivotally supports the rear end sides of the drive shaft 8 and the driven shaft 9. Each bearing 25 is provided with a bearing hole 25x into which the rear end sides of the drive shaft 8 and the driven shaft 9 can be respectively fitted, and is provided on the inner periphery of the bearing hole 25x so that the drive shaft 8 and the driven shaft 9 can slide. A bush 25y that supports the shaft is provided.

また、本実施形態では、駆動側はすば歯車６の後側の側面６ａ及び従動側はすば歯車７の後側の側面７ａに、後側板３ａを添接させて設けている。また、駆動側はすば歯車６の前側の側面６ｂ及び従動側はすば歯車７の前側の側面７ｂに、前側板３ｂを添接させて設けている。   In the present embodiment, the drive side is provided with the rear side plate 3 a attached to the rear side surface 6 a of the helical gear 6 and the driven side helical gear 7. Further, the driving side is provided with a front side plate 3b attached to the front side surface 6b of the helical gear 6 and the driven side helical surface 7b.

前記液圧機構４は、図１及び図３に示すように、前記駆動軸８及び前記従動軸９にそれぞれ対応させてリアカバー２３の内部、さらに詳述すると前記軸受穴２５ｘの後方に形成した対をなす液圧室４１ａ、４１ｂと、前記液圧室４１ａ、４１ｂ内にそれぞれスライド可能に嵌装された対をなすシュー４２ａ、４２ｂとを具備してなるものである。前記シュー４２ａ、４２ｂは、一部が前記液圧室４１ａ、４１ｂ内に配され液圧室４１ａ、４１ｂの内壁に内接する主部と、この主部よりも大径でかつ前記主部よりも前記駆動軸８又は従動軸９に近い側に配された鍔部とを備えている、また、前記シュー４２ａ、４２ｂは、このシュー４２ａ、４２ｂと前記駆動軸８又は従動軸９との間に形成される隙間Ｓａ、Ｓｂに前記液圧室４１ａ、４１ｂ内から作動液を導入するためのオリフィス４２ａ１、４２ｂ１と、前記駆動軸８又は従動軸９に向かう面の外周部に形成され前記鍔部からさらに前記駆動軸８又は従動軸９に向けて突出したシールランド４２ａ２、４２ｂ２とを備えている。 As shown in FIGS. 1 and 3, the hydraulic mechanism 4 is formed in a rear cover 23 corresponding to the drive shaft 8 and the driven shaft 9, respectively, more specifically, a pair formed behind the bearing hole 25x. And hydraulic pressure chambers 41a and 41b, and pairs of shoes 42a and 42b slidably fitted in the hydraulic pressure chambers 41a and 41b, respectively. The shoes 42a, 42b are partly arranged in the hydraulic chambers 41a, 41b, a main portion inscribed in the inner walls of the hydraulic chambers 41a, 41b, a larger diameter than the main portion, and larger than the main portion. The shoe 42a, 42b is provided between the shoe 42a, 42b and the drive shaft 8 or the driven shaft 9. The orifices 42a1 and 42b1 for introducing hydraulic fluid from the hydraulic pressure chambers 41a and 41b into the gaps Sa and Sb, and the flanges formed on the outer peripheral portion of the surface toward the drive shaft 8 or the driven shaft 9 further comprising a seal land 42a2,42b2 projecting said toward the drive shaft 8 or the driven shaft 9.

前記高圧作動液導入路５は、液圧機構４の液圧室４１ａ、４１ｂに高圧側から作動液を導くためのもので、図２に示すように、リアカバー２３内に形成されている。   The high-pressure hydraulic fluid introduction path 5 is for guiding the hydraulic fluid from the high-pressure side to the hydraulic chambers 41a and 41b of the hydraulic mechanism 4, and is formed in the rear cover 23 as shown in FIG.

ここで、この歯車ポンプＰ１の前記駆動軸８を介して前記駆動側はすば歯車６及び従動側はすば歯車７を同期逆回転駆動した場合に、前記作動液吸入口と前記作動液吐出口２ｂとの間で高低圧差が生じる。このとき、ボディ２１内部の空間のうち、前記駆動側はすば歯車６及び従動側はすば歯車７の歯同士が漸次離反する側、つまり前記作動液吸込口側の空間が低圧領域になるとともに、歯同士が漸次噛合する側、つまり作動液吐出口２ｂ側の空間が高圧領域になる。その際、作動液吐出口２ｂ側から液圧室４１ａ、４１ｂに作動液が導かれ、さらに、シュー４２ａ、４２ｂに形成したオリフィス４２ａ１、４２ｂ１を介してシュー４２ａ、４２ｂと前記駆動軸８又は従動軸９との間に形成される隙間Ｓａ、Ｓｂにも作動液が導入される。この作動液の液圧に由来する力により前記駆動軸８及び従動軸９が反スラスト方向に押圧される。一方、前記隙間Ｓａ、Ｓｂの外周部すなわち前記シールランド４２ａ２、４２ｂ２と前記駆動軸８又は従動軸９とが対向する部分は、他の部分と比較して隙間Ｓａ、Ｓｂの幅が狭い。そのため、前記駆動軸８及び従動軸９が回転している際には、この部分に緩やかな圧力勾配を有する流体被膜が形成され、前記隙間Ｓａ、Ｓｂの他の部分の液圧は略保たれ、前記液圧機構４がスラスト軸受として機能する。   Here, when the driving-side helical gear 6 and the driven-side helical gear 7 are driven synchronously and reversely through the driving shaft 8 of the gear pump P1, the hydraulic fluid suction port and the hydraulic fluid discharge are driven. A high and low pressure difference is generated between the outlet 2b. At this time, in the space inside the body 21, the side where the teeth of the helical gear 6 on the driving side and the helical gear 7 on the driven side are gradually separated from each other, that is, the space on the hydraulic fluid suction port side is a low pressure region. At the same time, the space where the teeth gradually mesh, that is, the space on the hydraulic fluid discharge port 2b side, becomes a high pressure region. At that time, the hydraulic fluid is guided from the hydraulic fluid discharge port 2b side to the hydraulic chambers 41a and 41b, and the shoes 42a and 42b and the drive shaft 8 or the driven shaft are further connected through the orifices 42a1 and 42b1 formed in the shoes 42a and 42b. The working fluid is also introduced into the gaps Sa and Sb formed between the shaft 9. The drive shaft 8 and the driven shaft 9 are pressed in the anti-thrust direction by a force derived from the hydraulic pressure of the hydraulic fluid. On the other hand, the outer peripheral portions of the gaps Sa and Sb, that is, the portions where the seal lands 42a2 and 42b2 face the drive shaft 8 or the driven shaft 9 are narrower than the other portions. Therefore, when the drive shaft 8 and the driven shaft 9 are rotating, a fluid film having a gentle pressure gradient is formed in this portion, and the fluid pressure in the other portions of the gaps Sa and Sb is substantially maintained. The hydraulic mechanism 4 functions as a thrust bearing.

なお、この歯車ポンプＰ１は、作動液吐出口２ｂより高圧の作動液を導入し、これにより前記駆動軸８から回転トルクを取り出して外部負荷を駆動するとともに、低圧となった作動液を前記作動液吸込口から吐出するというモータ作用を営む歯車モータとして機能させることもできるものであることはいうまでもない。   The gear pump P1 introduces high-pressure hydraulic fluid from the hydraulic fluid discharge port 2b, thereby taking out rotational torque from the drive shaft 8 and driving an external load, and at the same time, operating the hydraulic fluid at low pressure in the operation. It goes without saying that it can also function as a gear motor that performs the motor action of discharging from the liquid suction port.

以上に述べたように、本実施形態に係る歯車ポンプＰ１の構成によれば、前記液圧室４１ａ、４１ｂ内に導入された作動液圧のみにより前記駆動軸８及び前記従動軸９を反スラスト方向に押圧するようにしているので、ピストンを前記駆動軸８又は前記従動軸９に接触させることによる不具合の発生を防止することができる。その上で、前記駆動軸８又は従動軸９に向かう面の外周部に形成され前記駆動軸８又は従動軸９に向けて突出したシールランド４２ａ２、４２ｂ２を設けていることにより、前記駆動軸８及び従動軸９の回転に伴いこのシールランド４２ａ２、４２ｂ２と前記駆動軸８又は前記従動軸９との空間に緩やかな圧力勾配を有する流体被膜が発生し、前記隙間の他の部分に導入された液圧が保たれ、この液圧機構４をスラスト方向の軸受として利用することができる。   As described above, according to the configuration of the gear pump P1 according to this embodiment, the driving shaft 8 and the driven shaft 9 are anti-thrusted only by the hydraulic pressure introduced into the hydraulic pressure chambers 41a and 41b. Since the pressure is pressed in the direction, it is possible to prevent the occurrence of problems caused by bringing the piston into contact with the drive shaft 8 or the driven shaft 9. In addition, by providing seal lands 42a2 and 42b2 formed on the outer peripheral portion of the surface toward the drive shaft 8 or the driven shaft 9 and projecting toward the drive shaft 8 or the driven shaft 9, the drive shaft 8 As the driven shaft 9 rotates, a fluid film having a gradual pressure gradient is generated in the space between the seal lands 42a2 and 42b2 and the drive shaft 8 or the driven shaft 9, and is introduced into other portions of the gap. The hydraulic pressure is maintained, and this hydraulic mechanism 4 can be used as a bearing in the thrust direction.

なお、本発明は以上に述べた実施形態に限らず、種々に変形してよい。   The present invention is not limited to the embodiment described above, and may be variously modified.

例えば、上述した実施形態においては、外接歯車対を収納する歯車収納室を備えたボディと、このボディの前端を閉塞するフロントカバーと、このボディの後端を閉塞するリアカバーとをそれぞれ別体に形成しているが、前記ボディと前記フロントカバーとを一体に構成したものや、前記ボディと前記リアカバーとを一体に構成したものに本発明を適用してもよい。   For example, in the above-described embodiment, the body including the gear housing chamber that houses the external gear pair, the front cover that closes the front end of the body, and the rear cover that closes the rear end of the body are separately provided. Although formed, the present invention may be applied to a configuration in which the body and the front cover are integrated, or a configuration in which the body and the rear cover are integrated.

加えて、上述した実施形態において、フロントカバーが前側板を兼ねる構成や、リアカバーが後側板を兼ねる構成を採用してもよい。   In addition, in the above-described embodiment, a configuration in which the front cover also serves as the front side plate or a configuration in which the rear cover also serves as the rear side plate may be employed.

その他、本発明の趣旨を損ねない範囲で種々に変形してよい。   In addition, various modifications may be made without departing from the spirit of the present invention.

互いに噛み合う駆動側はすば歯車及び従動側はすば歯車からなる外接歯車対を備えた歯車ポンプ又はモータにおいて、本発明の歯車ポンプ又はモータの構成を採用すれば、ピストンを駆動軸及び従動軸に接触させた状態で駆動軸及び従動軸を反スラスト方向に押圧することに伴いメカロスが発生する不具合を解消することができる。   In the gear pump or motor having a pair of external gears composed of a helical gear on the driving side and a helical gear on the driven side that are meshed with each other, if the configuration of the gear pump or motor of the present invention is adopted, the piston is driven and driven. It is possible to eliminate a problem that mechanical loss occurs due to pressing of the drive shaft and the driven shaft in the anti-thrust direction in a state where they are in contact with each other.

Ｐ１…歯車ポンプ
１…外接歯車対
２…ケーシング
２ａ…歯車収納室
３…側板
４…液圧機構
４１…液圧室
４２…シュー
５…高圧作動液導入路
６…駆動側はすば歯車
７…従動側はすば歯車
８…駆動軸
９…従動軸P1 ... gear pump 1 ... external gear pair 2 ... casing 2a ... gear housing chamber 3 ... side plate 4 ... hydraulic mechanism 41 ... hydraulic chamber 42 ... shoe 5 ... high pressure hydraulic fluid introduction path 6 ... drive side helical gear 7 ... Helical gear on the driven side 8 ... Drive shaft 9 ... Drive shaft

Claims (1)

互いに噛み合う駆動側はすば歯車及び従動側はすば歯車からなる外接歯車対と、この外接歯車対を収納する歯車収納室を内部に有するとともに前記駆動側はすば歯車を軸支する駆動軸及び前記従動側はすば歯車を軸支する従動軸を収納するための軸受を有するケーシングと、液圧室を有しこの液圧室に導入される液圧により前記駆動軸及び従動軸を反スラスト方向に押圧する液圧機構と、この液圧機構の液圧室に高圧側から作動液を導く高圧作動液導入路とを具備してなる歯車ポンプ又はモータであって、
前記液圧機構が、前記駆動軸又は従動軸に対向し前記駆動側はすば歯車又は従動側はすば歯車と反対側に位置し内部に導入された作動液圧により前記駆動軸又は従動軸を反スラスト方向に押圧するための液圧室と、この液圧室内にスライド可能に嵌装されたシューとを備え、前記シューが、一部が前記液圧室内に配され液圧室の内壁に内接する主部と、この主部よりも大径でかつ前記主部よりも前記駆動軸又は従動軸に近い側に配された鍔部とを備えているとともに、前記シューが、このシューと前記駆動軸又は従動軸との間に形成される隙間に前記液圧室内から作動液を導入するためのオリフィスと、前記駆動軸又は従動軸に向かう面の外周部に形成され前記鍔部からさらに前記駆動軸又は従動軸に向けて突出したシールランドとを備えていることを特徴とする歯車ポンプ又はモータ。 A drive shaft that has an external gear pair composed of a helical gear and a driven helical gear that mesh with each other, and a gear housing chamber that houses the external gear pair, and that supports the helical gear on the drive side. And a casing having a bearing for housing a driven shaft for supporting the helical gear on the driven side, and a hydraulic chamber having a hydraulic pressure chamber, the drive shaft and the driven shaft being counteracted by the hydraulic pressure introduced into the hydraulic pressure chamber. A gear pump or motor comprising a hydraulic mechanism for pressing in the thrust direction, and a high-pressure hydraulic fluid introduction path for introducing hydraulic fluid from the high-pressure side to the hydraulic chamber of the hydraulic mechanism,
The hydraulic pressure mechanism is opposed to the drive shaft or driven shaft, the drive side is located on the opposite side of the helical gear or the driven side is located on the opposite side of the helical gear, and the drive shaft or driven shaft is driven by the hydraulic pressure introduced inside. And a shoe slidably fitted in the hydraulic chamber, the shoe being partly disposed in the hydraulic chamber, and an inner wall of the hydraulic chamber A main part that is inscribed in the main part, and a flange part that is larger in diameter than the main part and disposed closer to the drive shaft or the driven shaft than the main part. and an orifice for introducing the hydraulic fluid from the hydraulic pressure chamber in a gap formed between the drive shaft or the driven shaft, are formed on the outer peripheral portion of the surface facing the drive shaft or the driven shaft further from the flange portion A seal land protruding toward the drive shaft or the driven shaft Gear pump or motor, characterized in Rukoto.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102009908B1 (en) * 2018-05-15 2019-08-14 김범열 Helical gear pump
KR102454935B1 (en) * 2021-04-26 2022-10-18 주식회사 진성정밀 Helical gear pump

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Publication number Priority date Publication date Assignee Title
JPS4716424Y1 (en) * 1969-11-18 1972-06-09
JPS5114161B2 (en) * 1971-10-28 1976-05-07
JPS542407Y1 (en) * 1973-07-12 1979-02-01
JPS5339801U (en) * 1976-09-10 1978-04-06
JP2538658Y2 (en) * 1989-04-29 1997-06-18 株式会社島津製作所 Gear pump
JP5724691B2 (en) * 2011-07-05 2015-05-27 株式会社島津製作所 Gear pump or motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102009908B1 (en) * 2018-05-15 2019-08-14 김범열 Helical gear pump
KR102454935B1 (en) * 2021-04-26 2022-10-18 주식회사 진성정밀 Helical gear pump

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