WO2014199489A1 - Gear wheel pump or motor - Google Patents

Gear wheel pump or motor Download PDF

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Publication number
WO2014199489A1
WO2014199489A1 PCT/JP2013/066358 JP2013066358W WO2014199489A1 WO 2014199489 A1 WO2014199489 A1 WO 2014199489A1 JP 2013066358 W JP2013066358 W JP 2013066358W WO 2014199489 A1 WO2014199489 A1 WO 2014199489A1
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WO
WIPO (PCT)
Prior art keywords
gear
side plate
gasket
gears
pressure
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PCT/JP2013/066358
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French (fr)
Japanese (ja)
Inventor
光平 松田
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株式会社 島津製作所
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Priority to PCT/JP2013/066358 priority Critical patent/WO2014199489A1/en
Publication of WO2014199489A1 publication Critical patent/WO2014199489A1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12Rotary-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
    • F04C2/14Rotary-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01CROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10Outer members for co-operation with rotary pistons; Casings
    • F01C21/104Stators; Members defining the outer boundaries of the working chamber
    • F01C21/108Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082Details specially related to intermeshing engagement type machines or pumps
    • F04C2/088Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023Axial sealings for working fluid
    • F04C15/0026Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00Components
    • F04C2240/50Bearings
    • F04C2240/56Bearing bushings or details thereof

Abstract

 A gear wheel pump or a motor comprising a pair of meshing gear wheels, a side plate adjacent to the side surfaces of the gear wheels, a casing provided with a gear wheel accommodating chamber for accommodating the gear wheels and bearing holes into which shafts for supporting the gear wheels can be fitted, and a gasket mounted in a gasket-mounting groove provided to the side plate or the casing, wherein a configuration is employed in which a through-hole passing through the side plate in a thickness direction is provided at a location in the side plate that opposes the location where the pair of gear wheels mesh, and a pocket passing through the gasket in the thickness direction and forming a space sectioned off by the side plate, the casing, and the gasket is provided at a location in the gasket that faces the through-hole.

Description

歯車ポンプ又はモータGear pump or motor
 本発明は、産業車両等に用いられ、噛合する少なくとも一対の歯車の歯溝を利用して作動液を送り出す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 that is used in industrial vehicles and the like and sends out hydraulic fluid using the tooth spaces of at least a pair of gears that mesh with each other.
 従来より、噛合する少なくとも一対の歯車の歯溝を利用して作動液を送り出す外接型歯車ポンプにおいて、これら歯車の側面近傍に可動側板を配設し、作動液の側方への漏れ量を低減せしめることが知られている(例えば、特許文献1を参照)。この種の歯車ポンプにおける可動側板は、歯車a2、a3の歯及び側板a6の摺動面a6aにより区成させる空間(以下、ギア摺動部Sと称する)に閉じ込められた作動液の液圧により歯a2、a3車から離反する方向の力を受けるが、側板a6の摺動面a6aと反対側の面すなわち非摺動面と図示しないケーシングの内周面との間に形成されるシール部に高圧の作動液を導き入れることで、この力と相反する力、即ち歯車a2、a3に接近する方向の力を側板a6に付与して圧力バランスを保つようにしている。 Conventionally, in a circumscribed gear pump that feeds hydraulic fluid using the gear grooves of at least a pair of gears that mesh with each other, a movable side plate is provided near the side surface of these gears to reduce the amount of hydraulic fluid leaked to the side. It is known to cause the problem (see, for example, Patent Document 1). The movable side plate in this type of gear pump is driven by the hydraulic pressure of the working fluid confined in the space defined by the teeth of the gears a2 and a3 and the sliding surface a6a of the side plate a6 (hereinafter referred to as the gear sliding portion S). The teeth a2 and a3 receive force in the direction away from the wheel, but the seal part formed between the surface opposite to the sliding surface a6a of the side plate a6, that is, the non-sliding surface, and the inner peripheral surface of the casing (not shown) By introducing high-pressure hydraulic fluid, a force opposite to this force, that is, a force in a direction approaching the gears a2 and a3, is applied to the side plate a6 so as to maintain the pressure balance.
 ここで、歯間に閉じ込められた作動液の液圧は、時間の経過に伴い、以下のように変化する。まず、図6の(a)及び図5の点Aに示す状態では、前記ギア摺動部Sに閉じ込められた作動液の液圧すなわちギア摺動部閉じ込み圧力が吸込圧に等しくなっているのに対し、前記シール部の圧力は吐出圧に等しいので、側板が歯車に押し付けられ、大きなロストルクが発生する。次いで、図6の(b)及び図5の点Bに示す状態と図6の(c)及び図5の点Cに示す状態との間では、前記シール部の圧力は吐出圧に等しいのに対して、ギア摺動部閉じ込み圧力は、歯間で作動液が圧縮されることから吐出圧よりも高くなる。そのため、歯車a2、a3の側面と側板a6との間に隙間が発生して歯車側面からの液漏れが発生しやすくなる。 Here, the hydraulic pressure of the hydraulic fluid confined between the teeth changes as follows with the passage of time. First, in the state shown in FIG. 6A and point A in FIG. 5, the hydraulic pressure of the working fluid confined in the gear sliding portion S, that is, the gear sliding portion closing pressure is equal to the suction pressure. On the other hand, since the pressure of the seal portion is equal to the discharge pressure, the side plate is pressed against the gear, and a large loss torque is generated. Next, between the state shown at point B in FIGS. 6B and 5 and the state shown at point C in FIGS. 6C and 5, the pressure of the seal portion is equal to the discharge pressure. On the other hand, the gear sliding portion closing pressure is higher than the discharge pressure because the hydraulic fluid is compressed between the teeth. Therefore, a clearance is generated between the side surfaces of the gears a2 and a3 and the side plate a6, and liquid leakage from the side surfaces of the gears is likely to occur.
 そこで、従来のこの種の歯車ポンプでは、シール部側すなわち非摺動面a6b側から側板a6を歯車a2,a3に押し付ける力がギア摺動部Sから側板a6を歯車2、3から離間する方向に押す力より若干大きくなるようにしつつ摺動面a6aが焼き付かない程度となるように、シール部の高圧の作動液を導き入れる部位の面積を設定している。このように設定していることにより、歯車a2、a3と側板a6との間の隙間から作動液が漏れることを抑制することができる。 Thus, in this type of conventional gear pump, the force pressing the side plate a6 against the gears a2 and a3 from the seal portion side, that is, the non-sliding surface a6b side, separates the side plate a6 from the gears 2 and 3 from the gear sliding portion S. The area of the portion into which the high-pressure hydraulic fluid in the seal portion is introduced is set so that the sliding surface a6a does not seize while being slightly larger than the pressing force. By setting in this way, it can suppress that a hydraulic fluid leaks from the clearance gap between the gearwheels a2 and a3 and the side plate a6.
 しかしながら、前段に述べたように設定すると、非摺動面a6b側から側板a6を歯車a2、a3に押し付ける力がギア摺動部Sから側板a6を歯車a2、a3から離間する方向に押す力より若干大きくなるようにしていることから、歯車a2、a3と側板a6との間に発生する摩擦力が大きくなり、ロストルクが大きくなるという不具合が発生する。 However, when set as described in the previous stage, the force pressing the side plate a6 against the gears a2 and a3 from the non-sliding surface a6b side is greater than the force pressing the side plate a6 away from the gears a2 and a3 from the gear sliding portion S. Since it is made slightly larger, the frictional force generated between the gears a2, a3 and the side plate a6 becomes larger, resulting in a problem that the loss torque becomes larger.
特開2003-83262号公報JP 2003-83262 A
 本発明は以上の点に着目し、歯車と側板との間の隙間からの作動液漏れの抑制と、ロストルクの低減とを両立できる構成の歯車ポンプ又はモータを実現することを目的とする。 The present invention pays attention to the above points, and an object thereof is to realize a gear pump or motor having a configuration capable of achieving both suppression of hydraulic fluid leakage from the gap between the gear and the side plate and reduction of loss torque.
 以上の課題を解決すべく、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、噛合する少なくとも一対の歯車と、これら歯車の側面に隣接する側板と、前記歯車を収納する歯車収納室及び前記歯車を支持する軸がそれぞれ嵌入可能な軸受孔を備えるケーシングと、前記側板又はケーシングに設けたガスケット装着溝に装着したガスケットとを具備する歯車ポンプまたはモータであって、前記側板の前記歯車が噛合する箇所に対向する箇所に該側板の厚さ方向に貫通する貫通孔を設けているとともに、前記ガスケットの前記貫通孔に臨む箇所に該ガスケットの厚さ方向に貫通するとともに前記側板、前記ケーシング及び該ガスケットにより区成される空間を形成するためのポケットを設けている。 In order to solve the above-described problems, the gear pump or motor according to the present invention has a configuration as described below. That is, the gear pump or motor according to the present invention includes at least a pair of meshing gears, side plates adjacent to the side surfaces of the gears, a gear storage chamber for storing the gears, and a bearing into which a shaft for supporting the gears can be fitted. A gear pump or motor comprising a casing having a hole and a gasket mounted in the side plate or a gasket mounting groove provided in the casing, wherein the thickness of the side plate is opposed to a position where the gear meshes with the side plate. A through-hole penetrating in the vertical direction is provided, and a space defined by the side plate, the casing, and the gasket is formed at a location facing the through-hole of the gasket in the thickness direction of the gasket. A pocket is provided.
 このようなものであれば、歯間で作動液が圧縮されると、前記貫通孔を経て前記ガスケットのポケット内部の空間に作動液が導かれるので、ギア摺動部の圧力を低減し、シール部側からの圧力に起因する力とバランスさせて作動液の漏れを抑制することができる。このことから、歯間に閉じ込められた作動液の液圧すなわちギア摺動部閉じ込み圧力が吸込圧に等しくなっている状態において側板を強く歯車側に押し付ける必要がなくなり、ロストルクの低減を図ることができる。 In such a case, when the hydraulic fluid is compressed between the teeth, the hydraulic fluid is guided to the space inside the pocket of the gasket through the through hole, so that the pressure of the gear sliding portion is reduced and the seal is The leakage of the hydraulic fluid can be suppressed in balance with the force resulting from the pressure from the part side. From this, it is not necessary to press the side plate strongly against the gear side when the hydraulic pressure of the working fluid confined between the teeth, that is, the gear sliding portion closing pressure is equal to the suction pressure, and the loss torque is reduced. Can do.
 また、作動液圧に起因して側板に対して作用する力をバランスさせるための設計を容易に行うようにするための構成として、前記貫通孔の前記歯車側の端部に連通させて座ぐり部を設けているものが挙げられる。 Further, as a configuration for facilitating the design for balancing the force acting on the side plate due to the hydraulic pressure, the counterbore is connected to the end of the through hole on the gear side. The thing which provides the part is mentioned.
 本発明によれば、歯車と側板との間の隙間からの作動液漏れの抑制と、ロストルクの低減とを両立できる構成の歯車ポンプ又はモータを実現できる。 According to the present invention, it is possible to realize a gear pump or motor having a configuration capable of achieving both suppression of hydraulic fluid leakage from the gap between the gear and the side plate and reduction of loss torque.
本発明の一実施形態に係る歯車ポンプを示す概略図。Schematic which shows the gear pump which concerns on one Embodiment of this invention. 同実施形態に係る歯車ポンプの側板を示す図。The figure which shows the side plate of the gear pump which concerns on the same embodiment. 図2におけるA-A断面図。FIG. 3 is a sectional view taken along line AA in FIG. 2. 同実施形態に係る歯車ポンプの作動説明図。Operation | movement explanatory drawing of the gear pump which concerns on the same embodiment. 同実施形態の歯車の回転角度と側板に作用する力との関係の経時変化を示す図。The figure which shows the time-dependent change of the relationship between the rotation angle of the gear of the embodiment, and the force which acts on a side plate. 従来の歯車ポンプの作動説明図。Operation | movement explanatory drawing of the conventional gear pump.
 本発明の一実施形態を図1~図5を参照しつつ以下に示す。 One embodiment of the present invention will be described below with reference to FIGS.
 本実施形態に係る歯車ポンプは、主として、図1に示すように、歯車収納室11xを内部に有するケーシング1と、このケーシング1の歯車収納室11x内に収納保持され互いに噛み合わせてなる外接歯車対、すなわち駆動歯車2及び従動歯車3と、各歯車2、3の両側面2a、3aに添接する可動側板6、6と、前記歯車2、3を支持する軸4、5を収納するための軸受孔12a、12b,11a、11bと前記軸4、5との間に配設されるブッシュ7と、前記側板6、6に設けたガスケット装着溝6x、6xに装着した状態で前記側板6、6と前記ケーシング1との間に位置するガスケット8、8とを具備する。 As shown in FIG. 1, the gear pump according to the present embodiment mainly includes a casing 1 having a gear housing chamber 11x therein, and an external gear that is housed and held in the gear housing chamber 11x of the casing 1 and meshes with each other. A pair, that is, a drive gear 2 and a driven gear 3, movable side plates 6 and 6 that are in contact with both side surfaces 2 a and 3 a of the gears 2 and 3, and shafts 4 and 5 that support the gears 2 and 3. The side plate 6 in a state where it is mounted in the bush 7 disposed between the bearing holes 12a, 12b, 11a, 11b and the shafts 4, 5 and the gasket mounting grooves 6x, 6x provided in the side plates 6, 6. 6 and gaskets 8, 8 located between the casing 1.
 駆動歯車2及び従動歯車3は、図1に示すように、複数の歯体を外周面に沿って所定間隔で設けた周知のものである。なお、本実施形態では、前記駆動歯車2の中心から駆動軸4を回転軸方向に一体に延伸させて設けているとともに、従動歯車3から従動軸5を回転軸方向に一体に延伸させて設けているが、駆動歯車2と駆動軸4とを別体に構成してもよく、また、従動歯車3と従動軸5とを別体に構成してもよい。 The drive gear 2 and the driven gear 3 are well-known ones provided with a plurality of tooth bodies at predetermined intervals along the outer peripheral surface as shown in FIG. In the present embodiment, the drive shaft 4 is integrally extended from the center of the drive gear 2 in the rotational axis direction, and the driven shaft 5 is integrally extended from the driven gear 3 in the rotational axis direction. However, the drive gear 2 and the drive shaft 4 may be configured separately, and the driven gear 3 and the driven shaft 5 may be configured separately.
 ケーシング1は、図1に示すように、前記歯車収納室11xを有するボディ11と、この歯車収納室11xの開口面を閉塞するカバーたるフロントカバー12とから構成したものである。ボディ11には、前記歯車対すなわち駆動歯車2及び従動歯車3を噛合状態で収納する略眼鏡状の歯車収納室11xと、歯車収納室11xに連通し前記駆動軸4及び従動軸5がそれぞれ嵌入可能な軸受孔11a、11bとが形成されている。駆動歯車2を挿入すべき位置寄りの軸受孔11aにはブッシュ7を嵌装し、このブッシュ7に前記駆動軸4の一端部を回転可能な状態で嵌入している。一方、従動歯車3を挿入すべき位置寄りの軸受孔11bにもブッシュ7を嵌装していて、このブッシュ7に前記従動軸5の一端部を回転可能な状態で嵌入している。また、ボディ11には、図示は省略しているが、前記駆動歯車2と従動歯車3との噛合部位に臨む位置に吸込口及び吐出口をそれぞれ開口させてある。前記フロントカバー12は、例えばボディ11にボルト等によって着脱可能に装着されて前記歯車収納室11xの前側開口面を閉塞するものであり、前記駆動軸4及び従動軸5がそれぞれ嵌入可能な軸受孔12a、12bが形成さている。駆動歯車2を挿入すべき位置寄りの軸受孔12aにはブッシュ7を嵌装し、このブッシュ7に前記駆動軸4の一端部を挿入し回転可能に軸承している。一方、従動歯車3を挿入すべき位置寄りの軸受孔12bにもブッシュ7を嵌装していて、このブッシュ7に前記従動軸5の一端部を挿入し回転可能に軸承している。 As shown in FIG. 1, the casing 1 is composed of a body 11 having the gear housing chamber 11x and a front cover 12 serving as a cover for closing the opening surface of the gear housing chamber 11x. The body 11 is fitted with the substantially spectacle-shaped gear storage chamber 11x that stores the gear pair, that is, the drive gear 2 and the driven gear 3 in mesh, and the drive shaft 4 and the driven shaft 5 that communicate with the gear storage chamber 11x. Possible bearing holes 11a and 11b are formed. A bush 7 is fitted into the bearing hole 11a near the position where the drive gear 2 is to be inserted, and one end of the drive shaft 4 is fitted into the bush 7 in a rotatable state. On the other hand, a bush 7 is also fitted in the bearing hole 11b near the position where the driven gear 3 is to be inserted, and one end of the driven shaft 5 is fitted in this bush 7 in a rotatable state. Although not shown, the body 11 is provided with a suction port and a discharge port at positions facing the meshing portion of the drive gear 2 and the driven gear 3. The front cover 12 is detachably mounted on the body 11 with bolts or the like, for example, and closes the front opening surface of the gear housing chamber 11x, and a bearing hole into which the drive shaft 4 and the driven shaft 5 can be respectively inserted. 12a and 12b are formed. A bush 7 is fitted into the bearing hole 12a near the position where the drive gear 2 is to be inserted, and one end of the drive shaft 4 is inserted into the bush 7 so as to be rotatably supported. On the other hand, a bush 7 is fitted into the bearing hole 12b near the position where the driven gear 3 is to be inserted, and one end of the driven shaft 5 is inserted into the bush 7 so as to be rotatably supported.
 可動側板6は、図1~図3に示すように、前記駆動歯車2及び従動歯車3の両側面2a、3aに添接させるべく2箇所に配され、駆動歯車2及び従動歯車3の各側面2a、3aをそれぞれシールするためのものである。ここで、可動側板6の摺動面6a側のうち、高圧側の領域に吐出口から高圧の作動液が導入され、ケーシング1に前記駆動歯車2、従動歯車3及びこの可動側板6、6を収納した状態で、この可動側板6の非摺動面6bとケーシング1との間に高圧流体を導き入れることが可能なシール部6b1が形成される。さらに、この側板6には、前記駆動軸4又は従動軸5を通過させるための軸孔6cを設けている。そして、この側板6の摺動面6aのうち吸込口及び吐出口にそれぞれ臨む部位には、厚さ寸法を減じて切込み6d、6eがそれぞれ設けてある。加えて、前記摺動面6aにおける前記切込み6d、6e間の部位の中央部と、前記一対の歯車2、3とにより区画される空間を非摺動面側に開放すべく、厚さ方向に貫通する貫通孔6xをこの側板6に設けている。その上、貫通孔6xの摺動面6a側すなわち前記歯車2、3側の端部には座ぐり部6yを設けており、この座ぐり部6yが前記貫通孔6xに連通している。 As shown in FIGS. 1 to 3, the movable side plate 6 is disposed at two locations so as to be in contact with both side surfaces 2 a and 3 a of the drive gear 2 and the driven gear 3, and each side surface of the drive gear 2 and the driven gear 3. It is for sealing 2a and 3a, respectively. Here, high-pressure hydraulic fluid is introduced from the discharge port into the high-pressure side region on the sliding surface 6 a side of the movable side plate 6, and the drive gear 2, the driven gear 3 and the movable side plates 6, 6 are connected to the casing 1. A sealed portion 6b1 capable of introducing a high-pressure fluid is formed between the non-sliding surface 6b of the movable side plate 6 and the casing 1 in the housed state. Further, the side plate 6 is provided with a shaft hole 6c for allowing the drive shaft 4 or the driven shaft 5 to pass therethrough. Further, in the sliding surface 6a of the side plate 6, the portions facing the suction port and the discharge port are provided with cuts 6d and 6e with reduced thickness dimensions, respectively. In addition, in order to open a space defined by the central portion of the portion between the notches 6d and 6e and the pair of gears 2 and 3 in the sliding surface 6a to the non-sliding surface side in the thickness direction. A penetrating through hole 6 x is provided in the side plate 6. In addition, a counterbore 6y is provided at the end of the through hole 6x on the sliding surface 6a side, that is, on the side of the gears 2 and 3, and the counterbore 6y communicates with the through hole 6x.
 前記ブッシュ7は、上述したように、また図1及び図2に示すように、前記駆動軸4と前記ボディ11及び前記フロントカバー12の軸受孔11a、12aとの間、及び前記従動軸5と前記ボディ11及び前記フロントカバー12の軸受孔11b、12bとの間との間に配設されている。 As described above and as shown in FIGS. 1 and 2, the bush 7 is provided between the drive shaft 4 and the bearing holes 11 a and 12 a of the body 11 and the front cover 12, and the driven shaft 5. It is disposed between the body 11 and the bearing holes 11b, 12b of the front cover 12.
 前記ガスケット8は、弾性を有する材料により形成されている。また、このガスケット8は、上述したように、また、図1~図3に示すように、前記側板6の非摺動面6bに設けたガスケット装着突起6gに添接した状態で装着されて前記非摺動面6b及びケーシング1と圧着しており、前記シール部を低圧側Yすなわち吸込口側と高圧側Xすなわち吐出口側とに区画する。このガスケット8の前記側板6の貫通孔に臨む箇所には、該ガスケット8の厚さ方向に貫通するとともに前記側板6、前記ケーシング1及び該ガスケット8により区成される空間を形成するためのポケット8xを設けている。ここで、このガスケット8を前記駆動軸4及び従動軸5が伸びる方向から見た際の前記ポケット8xの面積は、後述するように、このポケット8x内に導入された作動液の圧力に起因して前記側板6が受ける力と、前記歯車2、3及び前記側板6の摺動面6aにより区画される領域及び前記座ぐり部6y(以下、前記領域及び座ぐり部6yを併せてギア摺動部Sと称する)に閉じ込められた作動液の圧力に起因して前記側板6が受ける力とが略バランスするように設定している。そして、前記ポケットの直径d2は、前記側板6の摺動面6aに設けた座ぐり部6yの長径d1よりも大きく設定している。 The gasket 8 is made of an elastic material. Further, as described above and as shown in FIGS. 1 to 3, the gasket 8 is mounted in a state of being attached to the gasket mounting protrusion 6g provided on the non-sliding surface 6b of the side plate 6. The seal portion is crimped to the non-sliding surface 6b and the casing 1, and the seal portion is divided into a low pressure side Y, that is, a suction port side, and a high pressure side X, that is, a discharge port side. A pocket for forming a space defined by the side plate 6, the casing 1, and the gasket 8 while penetrating in the thickness direction of the gasket 8 at a location facing the through hole of the side plate 6 of the gasket 8. 8x is provided. Here, the area of the pocket 8x when the gasket 8 is viewed from the direction in which the drive shaft 4 and the driven shaft 5 extend is caused by the pressure of the working fluid introduced into the pocket 8x, as will be described later. The sliding force applied to the side plate 6 and the region defined by the gears 2, 3 and the sliding surface 6a of the side plate 6 and the counterbore portion 6y (hereinafter, the region and the counterbore portion 6y are combined). The force applied to the side plate 6 due to the pressure of the working fluid confined in the portion S) is set so as to be substantially balanced. And the diameter d2 of the said pocket is set larger than the major axis d1 of the spot facing part 6y provided in the sliding face 6a of the said side plate 6. FIG.
 ここで、本実施形態に係る歯車ポンプPを運転した場合の歯車が噛合する箇所に対向する箇所の圧力及びシール部の圧力の経時変化について、図4及び図5を参照しつつ以下に述べる。 Here, with reference to FIG. 4 and FIG. 5, description will be given below with respect to temporal changes in the pressure at the location facing the location where the gear meshes and the pressure at the seal portion when the gear pump P according to this embodiment is operated.
 図4の(b)及び図5の点bに示す状態、並びに図4の(c)及び図5の点cに示す状態では、ギア摺動部S内の作動液は圧縮されるが、該ギア摺動部Sから作動液が前記ポケット8xに排出される。このとき、ギア摺動部S内の作動液の圧力に起因する押し付け力と、前記シール部6b1に導入された吐出圧及び前記ポケット8x内の作動液の圧力に起因する押し付け力とが打ち消し合い、側板6は歯車2、3に軽く接した状態に維持される。一方、図4の(a)及び図5の点aに示す状態では、前記ギア摺動部Sは吸込口側に開放されており、その内部の圧力は吸込圧と等しくなっているが、前記貫通孔6xを介して前記ポケット8xも吸込口側に開放されており、その結果、この状態においても前記シール6b1部に導入された吐出圧及び前記ポケット8x内の作動液の圧力に起因する押し付け力とギア摺動部S内の作動液の圧力に起因する押し付け力とが打ち消し合い、側板6は歯車2、3に軽く接した状態に維持される。 In the state shown at point b in FIG. 4B and FIG. 5 and the state shown at point c in FIG. 4C and FIG. 5, the hydraulic fluid in the gear sliding portion S is compressed. The hydraulic fluid is discharged from the gear sliding portion S to the pocket 8x. At this time, the pressing force caused by the pressure of the hydraulic fluid in the gear sliding portion S cancels out the pressing force caused by the discharge pressure introduced into the seal portion 6b1 and the pressure of the hydraulic fluid in the pocket 8x. The side plate 6 is kept in light contact with the gears 2 and 3. On the other hand, in the state shown at (a) in FIG. 4 and point a in FIG. 5, the gear sliding portion S is opened to the suction port side, and the internal pressure is equal to the suction pressure. The pocket 8x is also opened to the suction port side through the through hole 6x. As a result, even in this state, the pressure caused by the discharge pressure introduced into the seal 6b1 portion and the pressure of the working fluid in the pocket 8x The force and the pressing force resulting from the pressure of the hydraulic fluid in the gear sliding portion S cancel each other, and the side plate 6 is maintained in a state where it is in light contact with the gears 2 and 3.
 なお、この歯車ポンプPは、前記吐出口より高圧の作動液を導入し、これにより前記駆動軸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 P introduces high-pressure hydraulic fluid from the discharge port, thereby taking out rotational torque from the drive shaft to drive an external load and discharging low-pressure hydraulic fluid from the suction port. It goes without saying that it can also be made to function as a gear motor that performs the motor action.
 以上に述べたように、本実施形態では、前記ギア摺動部Sを非摺動面6b側に開放すべく側板6に厚さ方向に貫通する貫通孔6xを設けているとともに、前記ガスケット8の前記貫通孔6xに臨む箇所に該ガスケット8の厚さ方向に貫通するとともに前記側板6、前記ケーシング1及び該ガスケット8により区成される空間を形成するためのポケット8xを設けているので、ギア摺動部S内の作動液が圧縮された場合であっても、前記貫通孔6xを経て前記ガスケット8のポケット8x内部の空間に作動液が導かれる。従って、シール部6b1側からの液圧に起因する力とバランスさせて側板6が歯車2、3に軽く接した状態を維持することにより、作動液の漏れを抑制することができる。このことから、ギア摺動部S内の液圧が吸込圧に等しくなっている状態において側板6を強く歯車2、3側に押し付ける必要がなくなり、ロストルクの低減を図ることができる。 As described above, in this embodiment, the side plate 6 is provided with the through hole 6x penetrating in the thickness direction so as to open the gear sliding portion S to the non-sliding surface 6b side, and the gasket 8 is provided. Since a pocket 8x is formed at a location facing the through hole 6x in the thickness direction of the gasket 8 and forms a space defined by the side plate 6, the casing 1 and the gasket 8, Even when the hydraulic fluid in the gear sliding portion S is compressed, the hydraulic fluid is guided to the space inside the pocket 8x of the gasket 8 through the through hole 6x. Therefore, the leakage of the hydraulic fluid can be suppressed by maintaining the state in which the side plate 6 is in light contact with the gears 2 and 3 in balance with the force caused by the hydraulic pressure from the seal portion 6b1 side. Therefore, it is not necessary to strongly press the side plate 6 against the gears 2 and 3 in a state where the hydraulic pressure in the gear sliding portion S is equal to the suction pressure, and loss torque can be reduced.
 また、前記貫通孔6xの前記歯車2、3側の端部に連通させて座ぐり部6yを設けているので、この座ぐり部6y及び前記ポケット8xの寸法を調節することにより、側板6にギア摺動部S側すなわち摺動面6a側とシール部6b1側すなわち非摺動面6b側とからそれぞれ作用する作動液圧に起因する力をバランスさせるための設計を容易に行うことができる。 Further, since the counterbore 6y is provided in communication with the end of the through hole 6x on the side of the gears 2, 3, the side plate 6 can be adjusted by adjusting the size of the counterbore 6y and the pocket 8x. It is possible to easily perform a design for balancing the forces caused by the hydraulic fluid pressure acting from the gear sliding portion S side, that is, the sliding surface 6a side, and the seal portion 6b1 side, that is, the non-sliding surface 6b side.
 加えて、ガスケット8を弾性を有する材料により形成し、このガスケット8により前記ポケット8xを形成しているので、このポケット8xに閉じ込められる作動液の液圧に変動が生じた際に、ガスケット8が弾性変形して作動液の液圧の変化を吸収する緩衝作用を得ることができる。 In addition, since the gasket 8 is formed of an elastic material and the pocket 8x is formed by the gasket 8, when the hydraulic pressure of the working fluid confined in the pocket 8x fluctuates, It is possible to obtain a buffering action that elastically deforms and absorbs a change in hydraulic pressure of the working fluid.
 なお、本実施形態は上述した実施形態に限らない。 In addition, this embodiment is not restricted to embodiment mentioned above.
 例えば、上述した実施形態では、側板の貫通孔の前記歯車側の端部に連通させて座ぐり部を設けているが、例えば、貫通孔の径を歯車から遠ざかるにつれ小さくなる形状のものとする等、他の手段により歯車の歯と側板の摺動面との間の空間に閉じ込められた作動液を逃がすための空間を形成してもよく、このような空間を省略してもよい。 For example, in the above-described embodiment, the counterbore portion is provided in communication with the end portion on the gear side of the through hole of the side plate. For example, the diameter of the through hole is reduced as the distance from the gear decreases. For example, a space for releasing the working fluid confined in the space between the gear teeth and the sliding surface of the side plate by other means may be formed, and such a space may be omitted.
 また、上述した実施形態のように、ケーシング内に歯車を一対のみ設けたものに限らず、ケーシング内に歯車を二対以上設けた歯車ポンプ又はモータに本発明を適用してもよい。 Further, as in the above-described embodiment, the present invention is not limited to the case where only a pair of gears are provided in the casing, but may be applied to a gear pump or motor in which two or more pairs of gears are provided in the casing.
 その他、本発明の趣旨を損ねない範囲で種々に変更してよい。 Other various modifications may be made without departing from the spirit of the present invention.
 噛合する一対の歯車と、これら歯車の側面に隣接する側板と、前記歯車を収納する歯車収納室及び前記歯車を支持する軸がそれぞれ嵌入可能な軸受孔を備えるケーシングと、前記側板又はケーシングに設けたガスケット装着溝に装着したガスケットとを具備する歯車ポンプまたはモータにおいて、歯車と側板との間の隙間からの作動液漏れの抑制と、ロストルクの低減とを両立できる構成の歯車ポンプ又はモータを実現できる。 A pair of meshing gears, side plates adjacent to the side surfaces of these gears, a gear housing chamber for housing the gears, a casing having a bearing hole into which a shaft for supporting the gears can be fitted, and a side plate or a casing. In a gear pump or motor equipped with a gasket mounted in a gasket mounting groove, a gear pump or motor configured to achieve both suppression of hydraulic fluid leakage from the gap between the gear and the side plate and reduction of loss torque is realized. it can.
 P…歯車ポンプ
 1…ケーシング
 2、3…歯車
 6…側板
 6x…貫通孔
 8…ガスケット
 8x…ポケット
P: Gear pump 1 ... Casing 2, 3 ... Gear 6 ... Side plate 6x ... Through hole 8 ... Gasket 8x ... Pocket

Claims (2)

  1. 噛合する少なくとも一対の歯車と、これら歯車の側面に隣接する側板と、前記歯車を収納する歯車収納室及び前記歯車を支持する軸がそれぞれ嵌入可能な軸受孔を備えるケーシングと、前記側板又はケーシングに設けたガスケット装着溝に装着したガスケットとを具備する歯車ポンプまたはモータであって、
    前記側板の前記歯車が噛合する箇所に対向する箇所に該側板の厚さ方向に貫通する貫通孔を設けているとともに、前記ガスケットの前記貫通孔に臨む箇所に該ガスケットの厚さ方向に貫通するとともに前記側板、前記ケーシング及び該ガスケットにより区成される空間を形成するためのポケットを設けていることを特徴とする歯車ポンプ又はモータ。
    At least a pair of gears that mesh with each other, side plates adjacent to the side surfaces of these gears, a gear housing chamber that houses the gears, a casing that includes a bearing hole into which a shaft that supports the gears can be fitted, and the side plates or the casings. A gear pump or motor comprising a gasket mounted in the provided gasket mounting groove,
    A through-hole penetrating in the thickness direction of the side plate is provided at a location facing the location where the gear of the side plate meshes, and the gasket is penetrated in a location facing the through-hole in the gasket in the thickness direction of the gasket. A gear pump or motor comprising a pocket for forming a space defined by the side plate, the casing, and the gasket.
  2. 前記貫通孔の前記歯車側の端部に連通させて座ぐり部を設けている請求項1記載の歯車ポンプ又はモータ。 The gear pump or motor according to claim 1, wherein a counterbore portion is provided in communication with an end portion of the through hole on the gear side.
PCT/JP2013/066358 2013-06-13 2013-06-13 Gear wheel pump or motor WO2014199489A1 (en)

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JPWO2019073602A1 (en) * 2017-10-13 2020-04-02 株式会社島津製作所 Gear pump or motor

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JPWO2019073602A1 (en) * 2017-10-13 2020-04-02 株式会社島津製作所 Gear pump or motor

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