JP5724691B2 - Gear pump or motor - Google Patents

Gear pump or motor Download PDF

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JP5724691B2
JP5724691B2 JP2011149568A JP2011149568A JP5724691B2 JP 5724691 B2 JP5724691 B2 JP 5724691B2 JP 2011149568 A JP2011149568 A JP 2011149568A JP 2011149568 A JP2011149568 A JP 2011149568A JP 5724691 B2 JP5724691 B2 JP 5724691B2
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gear
driven
drive
shaft
drive shaft
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信雄 向井
信雄 向井
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Shimadzu Corp
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Description

本発明は、はすば歯車を利用した駆動歯車と従動歯車とを互いに噛み合わせてなる外接歯車対を備え、この外接歯車対をケーシング内部の歯車収納室に収納してなる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 including an external gear pair formed by meshing a drive gear and a driven gear using a helical gear, and storing the external gear pair in a gear storage chamber inside a casing. .

従来、駆動歯車と従動歯車とを互いに噛み合わせてなる外接歯車対を備え、この外接歯車対をケーシング内部の歯車収納室に収納してなる歯車ポンプ又はモータにおいて、駆動歯車と従動歯車は直歯が主流で周囲の歯は軸芯に平行な歯が形成されたものである。この直歯同士が噛合う場合、その噛合い点が歯幅全域で同時的に行われ、その連続波動的な噛合いとなり、振動や騒音の原因となっている。この問題を解決すべく駆動歯車と従動歯車に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, in a gear pump or motor that includes an external gear pair in which a drive gear and a driven gear mesh with each other, and the external gear pair is housed in a gear housing chamber inside the casing, the drive gear and the driven gear are straight teeth. However, the surrounding teeth are formed with teeth parallel to the axis. When these straight teeth mesh with each other, the meshing point is simultaneously performed over the entire tooth width, resulting in continuous wave meshing, which causes vibration and noise. In order to solve this problem, a contrivance has been proposed in which helical gears are used for the driving gear and the driven gear (for example, see 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、この歯車ポンプPPは、図4に示すように、歯車収納室X11aを内部に有するケーシングX1と、このケーシングX1の歯車収納室X11a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X2及び従動歯車X3と、各歯車X2、X3の両側面X2a、X3aに添接する側板X6、X6とを具備する。   Such a gear pump or motor has the following configuration, for example. That is, as shown in FIG. 4, the gear pump PP includes a casing X1 having a gear housing chamber X11a therein and an external gear pair that is housed and held in the gear housing chamber X11a of the casing X1 and meshed with each other. A driving gear X2 and a driven gear X3, and side plates X6 and X6 that are in contact with both side surfaces X2a and X3a of the gears X2 and X3 are provided.

駆動歯車X2及び従動歯車X3は、複数の歯体を外周面に沿って所定間隔で設けた周知のはすば歯車である。ここで、これら駆動歯車X2と従動歯車X3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、これらの間の噛合部から、駆動歯車X2は後方に向かう作用、従動歯車X3は前方に向かう作用をそれぞれ受けるように構成している。本実施形態では、前記駆動歯車X2の中心から駆動軸X4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X3から従動軸X5を回転軸方向に一体に延伸させて設けている。   The drive gear X2 and the driven gear X3 are well-known helical gears in which a plurality of tooth bodies are provided at predetermined intervals along the outer peripheral surface. Here, when the teeth of the drive gear X2 and the driven gear X3 are operated as a gear pump in a state in which they are engaged, the drive gear X2 acts backward from the meshing portion between them, and the driven gear X3. Is configured to receive the action of moving forward. In the present embodiment, the drive shaft X4 is integrally extended from the center of the drive gear X2 in the rotational axis direction, and the driven shaft X5 is integrally extended from the driven gear X3 in the rotational axis direction. .

ケーシングX1は、前記歯車収納室X11aを有するボディX11と、歯車収納室X11aの一開口面を閉塞するカバーたるフロントカバーX12と、このフロントカバーX12と前記駆動歯車X2及び従動歯車X3との間に配してなり前記駆動軸X4及び従動軸X5をそれぞれ嵌入可能な軸受孔X13a、X13bを有するフロントベアリングケースX13と、歯車収納室X11aの他開口面を閉塞するカバーたるリアカバーX14と、このリアカバーX14と前記駆動歯車X2及び従動歯車X3との間に配してなり前記駆動軸X4及び従動軸X5がそれぞれ嵌入可能な軸受孔X15a、X15bを有するリアベアリングケースX15とを備えている。   The casing X1 includes a body X11 having the gear housing chamber X11a, a front cover X12 serving as a cover for closing one opening surface of the gear housing chamber X11a, and the front cover X12, the drive gear X2, and the driven gear X3. A front bearing case X13 having bearing holes X13a and X13b into which the drive shaft X4 and the driven shaft X5 can be respectively inserted, a rear cover X14 as a cover for closing the other opening surface of the gear housing chamber X11a, and the rear cover X14. And a rear bearing case X15 having bearing holes X15a and X15b into which the drive shaft X4 and the driven shaft X5 can be respectively inserted.

ボディX11には、その内部に前記歯車対すなわち駆動歯車X2及び従動歯車X3を噛合状態で収容する略眼鏡状の前記歯車収納室X11aを備えているとともに、この歯車収納室X11aの前方に前記フロントベアリングケースX13を、またこの歯車収納室X11aの後方に前記リアベアリングケースX15を収納するようにしている。また、ボディX11には、図示は省略しているが、前記駆動歯車X2と従動歯車X3との噛合ピッチ円における接線方向側の所定位置、すなわち前記駆動歯車X2と従動歯車X3との噛合ピッチ円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。そして、前記吸込口と前記噛合ピッチ円との間に、吸込通路を設けている。   The body X11 is provided with the gear storage chamber X11a having a substantially glasses shape in which the gear pair, that is, the drive gear X2 and the driven gear X3 are received in mesh, and the front of the gear storage chamber X11a is in front of the front of the gear storage chamber X11a. The bearing case X13 and the rear bearing case X15 are accommodated behind the gear housing chamber X11a. Although not shown, the body X11 has a predetermined position on the tangential side of the meshing pitch circle between the drive gear X2 and the driven gear X3, that is, the meshing pitch circle between the drive gear X2 and the driven gear X3. A suction port and a discharge port are respectively opened at positions facing the surface. A suction passage is provided between the suction port and the meshing pitch circle.

前記フロントカバーX12は、例えばボディX11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X11aの開口面を閉塞する。   The front cover X12 is detachably attached to the body X11 with bolts or the like, for example, and closes the opening surface of the gear housing chamber X11a.

前記フロントベアリングケースX13は、上述したようにフロントカバーX12と前記駆動歯車X2及び従動歯車X3との間に配してなる。駆動軸X4を挿入すべき軸受孔X13aにはブッシュX7を嵌装し、このブッシュX7に前記駆動軸X4の前端部を挿入し回転可能に軸承している。一方、従動軸X5を挿入すべき軸受孔X13bにもブッシュX7を嵌装していて、このブッシュX7に前記従動軸X5の前端部を挿入し回転可能に軸承している。これら軸受孔X13a、X13bの断面形状は、その長手方向の全域にわたって同径の円形状である。   As described above, the front bearing case X13 is disposed between the front cover X12 and the drive gear X2 and the driven gear X3. A bush X7 is fitted into the bearing hole X13a into which the drive shaft X4 is to be inserted, and a front end portion of the drive shaft X4 is inserted into the bush X7 so as to be rotatably supported. On the other hand, a bush X7 is fitted into the bearing hole X13b into which the driven shaft X5 is to be inserted, and the front end portion of the driven shaft X5 is inserted into the bush X7 so as to be rotatably supported. The cross-sectional shape of these bearing holes X13a and X13b is a circular shape having the same diameter over the entire region in the longitudinal direction.

前記リアベアリングケースX15は、上述したようにリアカバーX14と前記駆動歯車X2及び従動歯車X3との間に配してなる。駆動軸X4を挿入すべき軸受孔X15aにはブッシュX7を嵌装し、このブッシュX7に前記駆動軸X4の後端部を挿入し回転可能に軸承している。一方、従動軸X5を挿入すべき軸受孔X15bにもブッシュX7を嵌装していて、このブッシュX7に前記従動軸X5の後端部を挿入し回転可能に軸承している。これら軸受孔X15a、X15bの断面形状も、その長手方向の全域にわたって同径の円形状である。   As described above, the rear bearing case X15 is arranged between the rear cover X14 and the drive gear X2 and the driven gear X3. A bush X7 is fitted into the bearing hole X15a into which the drive shaft X4 is to be inserted, and a rear end portion of the drive shaft X4 is inserted into the bush X7 so as to be rotatably supported. On the other hand, a bush X7 is also fitted into the bearing hole X15b into which the driven shaft X5 is to be inserted, and a rear end portion of the driven shaft X5 is inserted into the bush X7 so as to be rotatably supported. The cross-sectional shapes of these bearing holes X15a and X15b are also circular with the same diameter over the entire length direction.

一方、側板X6は、前記駆動歯車X2及び従動歯車X3の両側面X2a、X3aに添接させるべく2箇所に配され、駆動歯車X2及び従動歯車X3の各側面X2a、X3aをそれぞれシールするためのものである。   On the other hand, the side plate X6 is disposed at two locations to be brought into contact with both side surfaces X2a and X3a of the drive gear X2 and the driven gear X3, and seals the side surfaces X2a and X3a of the drive gear X2 and the driven gear X3, respectively. Is.

ここで、歯車ポンプまたはモータにおける歯車をはすば歯形の歯車とすることによって歯形同士の噛合い点はその歯幅全域において軸芯方向に順次移動し、なめらかな噛合いが行われることになる。そのため、上述したような振動や騒音発生といった問題は解消される。しかしながら、両歯車の噛合い時、歯形に作用する力によって軸芯方向に分力が発生し歯車全体にスラスト方向の力が発生する。このスラスト力と液圧によるスラスト力とが合成されることにより、駆動歯車及び従動歯車がそれぞれ異なるスラスト力を受ける。このスラスト力を直歯歯車を利用した従来の歯車ポンプ又はモータのリア側の側板が受けると側板の面圧が過大となり強度的に困難となるため、例えば、図4の構成では、これら駆動歯車X2及び従動歯車X3をそれぞれ軸支する駆動軸X4及び従動軸X5の後端面にバランスピストンX8を接触させ、高圧領域にポンプとして機能する場合の吐出側から作動液圧を導入し、側板に大きなスラスト圧が作用することを防ぐようにしている。   Here, when the gear in the gear pump or the motor is a helical gear, the meshing points of the gear teeth are sequentially moved in the axial direction over the entire tooth width, and smooth meshing is performed. . Therefore, problems such as vibration and noise generation as described above are solved. However, when the two gears are engaged, a force acting on the tooth profile generates a component force in the axial direction, and a thrust force is generated in the entire gear. By combining the thrust force and the thrust force generated by the hydraulic pressure, the driving gear and the driven gear receive different thrust forces. When this thrust force is received by a side gear on the rear side of a conventional gear pump or motor that uses straight gears, the surface pressure of the side plate becomes excessive and difficult in strength. For example, in the configuration of FIG. The balance piston X8 is brought into contact with the rear end surfaces of the drive shaft X4 and the driven shaft X5 that respectively support the X2 and the driven gear X3, and hydraulic fluid pressure is introduced from the discharge side in the case of functioning as a pump in the high-pressure region. The thrust pressure is prevented from acting.

ところが、このような構成では、バランスピストンを追加する必要があるとともに、高圧領域に作動液圧を導入するための高圧通路を設ける必要があるため、リアカバーの構造が複雑なものとなる。また、高圧領域の作動液はピストン摺動面の隙間からも漏れるので、容積性能が低下するという不具合も発生する。   However, in such a configuration, it is necessary to add a balance piston, and it is necessary to provide a high-pressure passage for introducing hydraulic fluid pressure into the high-pressure region, so that the structure of the rear cover becomes complicated. Further, since the hydraulic fluid in the high pressure region also leaks from the gap between the piston sliding surfaces, there is a problem that the volume performance is lowered.

特開平5−330330号公報JP-A-5-330330

本発明は以上の点に着目したものであり、簡単な構成により、側板に大きなスラスト圧が作用することを防ぐことを所期の目的とする。   The present invention focuses on the above points, and an intended object is to prevent a large thrust pressure from acting on the side plate with a simple configuration.

すなわち本発明に係る歯車ポンプ又はモータの一つは、互いに噛み合わせてなる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歯車対と、この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歯車を軸支する駆動軸及び前記従動歯車を軸支する従動軸を収納するための軸受孔を有するケーシングと、前記歯車対の各歯車の両側面に添接する側板とを具備する歯車ポンプ又はモータであって、前記駆動軸及び従動軸の運転時に発生するスラスト作用が向かう側の一端部の形状を先端側に向かうに従い小径となる形状としているとともに、前記ケーシングの軸受孔の側面を、前記駆動軸及び従動軸の一端部の側面とほぼ平行な形状としていることを特徴とする。   That is, one of the gear pumps or motors according to the present invention includes a gear pair composed of a driving gear and a driven gear using helical gears meshed with each other, and a gear housing chamber for housing the gear pair. And a casing having a drive hole for pivotally supporting the drive gear and a bearing hole for accommodating the driven shaft for pivotally supporting the driven gear, and side plates attached to both side surfaces of each gear of the gear pair. A gear pump or a motor, wherein the one end portion on the side to which the thrust action generated during operation of the drive shaft and the driven shaft is directed has a shape that becomes a smaller diameter toward the tip side, and the side surface of the bearing hole of the casing Is formed in a shape substantially parallel to a side surface of one end of the drive shaft and the driven shaft.

このような構成によれば、駆動歯車及び従動歯車が受けるスラスト力を受ける機能は、主に駆動軸及び従動軸の運転時に発生するスラスト作用が向かう側の一端部とケーシングの軸受孔の側面とが対向する部位が担うこととなるので、側板は駆動歯車及び従動歯車の一側面を被覆し作動液のシールを行う機能のみを担うものとして設計することができる。従って、特殊な部材や作動液通路を追加する必要がなく、また容積性能の低下を伴うことなく、簡単な構成で側板に大きなスラスト圧が作用することを防ぐことができる。   According to such a configuration, the function of receiving the thrust force received by the drive gear and the driven gear mainly includes the one end portion on the side to which the thrust action generated during operation of the drive shaft and the driven shaft is directed, and the side surface of the bearing hole of the casing. Therefore, the side plate can be designed to have only the function of covering one side of the drive gear and the driven gear and sealing the hydraulic fluid. Therefore, it is not necessary to add a special member or a hydraulic fluid passage, and it is possible to prevent a large thrust pressure from acting on the side plate with a simple configuration without causing a decrease in volumetric performance.

また、本発明に係る歯車ポンプ又はモータの他の一つは、互いに噛み合わせてなる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歯車対と、この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歯車を軸支する駆動軸及び前記従動歯車を軸支する従動軸を収納するための軸受孔を有するケーシングと、前記歯車対の各歯車の両側面に添接する側板とを具備する歯車ポンプ又はモータであって、前記駆動軸及び従動軸の運転時に発生するスラスト作用が向かう側の一端部と前記ケーシングの軸受孔との間に、前記駆動軸及び従動軸の一端部の側面及び端面に対向するブッシュをさらに備えていることを特徴とする。   Another one of the gear pumps or motors according to the present invention is a gear pair comprising a driving gear and a driven gear each utilizing a helical gear meshed with each other, and a gear storage chamber for storing the gear pair. And a casing having a bearing hole for housing the drive shaft for supporting the drive gear and the driven shaft for supporting the driven gear, and side plates attached to both side surfaces of each gear of the gear pair; A gear pump or a motor comprising: one end of the drive shaft and the driven shaft between one end on the side to which a thrust action generated during operation of the drive shaft and the driven shaft is directed and the bearing hole of the casing A bushing facing the side surface and the end surface is further provided.

このような構成によれば、駆動歯車及び従動歯車が受けるスラスト力を受ける機能は、主に駆動軸及び従動軸の端面とブッシュとが対向する部位が担うこととなるので、側板は駆動歯車及び従動歯車の一側面を被覆し作動液のシールを行う機能のみを担うものとして設計することができる。従って、特殊な部材や作動液通路を追加する必要がなく、また容積性能の低下を伴うことなく、簡単な構成で側板に大きなスラスト圧が作用することを防ぐことができる。   According to such a configuration, the function of receiving the thrust force received by the drive gear and the driven gear is mainly performed by the portion where the end face of the drive shaft and the driven shaft and the bush face each other. It can be designed to cover only one side of the driven gear and perform the function of sealing the hydraulic fluid. Therefore, it is not necessary to add a special member or a hydraulic fluid passage, and it is possible to prevent a large thrust pressure from acting on the side plate with a simple configuration without causing a decrease in volumetric performance.

本発明によれば、簡単な構成により、側板に大きなスラスト圧が作用することを防ぐことができる。   According to the present invention, it is possible to prevent a large thrust pressure from acting on the side plate with a simple configuration.

本発明の第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 1st embodiment of this invention. 本発明の第二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 2nd embodiment of this invention. 本発明の第三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 3rd embodiment of this invention. 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、本発明の第一実施形態を、図面を参照して説明する。   Hereinafter, a first 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、主として、歯車収納室11a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11a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に添接する側板6、6とを具備する。   As shown in FIG. 1, the gear pump P1 according to the present embodiment mainly includes a casing 1 having a gear housing chamber 11a therein and a circumscribed portion that is housed and held in the gear housing chamber 11a of the casing 1 and meshes with each other. A gear pair, that is, a drive gear 2 and a driven gear 3, and side plates 6 and 6 that are in contact with both side surfaces 2 a and 3 a of the gears 2 and 3 are provided.

駆動歯車2及び従動歯車3は、複数の歯体を外周面に沿って所定間隔で設けた周知のはすば歯車である。ここで、これら駆動歯車2と従動歯車3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、これらの間の噛合部から、駆動歯車2は後方に向かう作用、従動歯車3は前方に向かう作用をそれぞれ受けるように構成している。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。ここで、前記駆動軸4及び従動軸5のうち前記ケーシング1の後述するフロントベアリングケース13に対向する部分は、その断面形状が長手方向の全域にわたって同径の円形となる円柱状をなしている。一方、前記駆動軸4及び従動軸5のうち前記ケーシング1の後述するリアベアリングケース15に対向する部分の断面形状は、後端側に向かうに従い小径となる円形状である。換言すれば、駆動軸4及び従動軸5の後端部は、後端側に向かうに従い小径となるテーパ状をなしている。なお、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 helical gears in which a plurality of tooth bodies are provided at predetermined intervals along the outer peripheral surface. Here, when the teeth of the drive gear 2 and the driven gear 3 are operated as a gear pump in a state where they are engaged, the drive gear 2 acts backward from the meshing portion between them. Is configured to receive the action of moving forward. In the present embodiment, the drive shaft 4 is integrally extended in the direction of the rotation axis from the center of the drive gear 2, and the driven shaft 5 is extended from the driven gear 3 in the direction of the rotation axis. . Here, portions of the drive shaft 4 and the driven shaft 5 facing a later-described front bearing case 13 of the casing 1 have a cylindrical shape whose cross-sectional shape is a circle having the same diameter over the entire length direction. . On the other hand, the cross-sectional shape of the part which faces the rear bearing case 15 mentioned later of the said casing 1 among the said drive shaft 4 and the driven shaft 5 is circular shape which becomes a small diameter as it goes to the rear end side. In other words, the rear end portions of the drive shaft 4 and the driven shaft 5 have a tapered shape with a smaller diameter toward the rear end side. Note that 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、前記歯車収納室11aを有するボディ11と、歯車収納室11aの一開口面を閉塞するカバーたるフロントカバー12と、このフロントカバー12と前記駆動歯車2及び従動歯車3との間に配してなり前記駆動軸4及び従動軸5がそれぞれ嵌入可能な軸受孔13a、13bを有するフロントベアリングケース13と、歯車収納室11aの他開口面を閉塞するカバーたるリアカバー14と、このリアカバー14と前記駆動歯車2及び従動歯車3との間に配してなり前記駆動軸4及び従動軸5がそれぞれ嵌入可能な軸受孔15a、15bを有するリアベアリングケース15とを備えている。   The casing 1 includes a body 11 having the gear housing chamber 11a, a front cover 12 serving as a cover for closing one opening surface of the gear housing chamber 11a, and the front cover 12 between the driving gear 2 and the driven gear 3. A front bearing case 13 having bearing holes 13a and 13b into which the drive shaft 4 and the driven shaft 5 can be respectively fitted; a rear cover 14 serving as a cover for closing the other opening surface of the gear housing chamber 11a; and the rear cover 14 And a rear bearing case 15 having bearing holes 15a and 15b into which the drive shaft 4 and the driven shaft 5 can be respectively inserted.

ボディ11には、その内部に前記歯車対すなわち駆動歯車2及び従動歯車3を噛合状態で収容する略眼鏡状の前記歯車収納室11aを備えているとともに、この歯車収納室11aの前方に前記フロントベアリングケース13を、またこの歯車収納室11aの後方に前記リアベアリングケース15を収納するようにしている。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との噛合ピッチ円における接線方向側の所定位置、すなわち前記駆動歯車2と従動歯車3との噛合ピッチ円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。そして、前記吸込口と前記噛合ピッチ円との間に、吸込通路を設けている。   The body 11 is provided with a substantially glasses-like gear storage chamber 11a for accommodating the gear pair, that is, the drive gear 2 and the driven gear 3 in an engaged state, and the front of the front of the gear storage chamber 11a. The bearing case 13 and the rear bearing case 15 are accommodated behind the gear housing chamber 11a. Although not shown, the body 11 has a predetermined position on the tangential side of the meshing pitch circle between the driving gear 2 and the driven gear 3, that is, the meshing pitch circle between the driving gear 2 and the driven gear 3. A suction port and a discharge port are respectively opened at positions facing the surface. A suction passage is provided between the suction port and the meshing pitch circle.

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11aの前側開口面を閉塞する。   The front cover 12 is detachably attached to the body 11 with a bolt or the like, for example, and closes the front opening surface of the gear housing chamber 11a.

前記フロントベアリングケース13は、上述したようにフロントカバー12と前記駆動歯車2及び従動歯車3との間に配してなる。駆動軸4を挿入すべき軸受孔13aには第1のブッシュ7を嵌装し、この第1のブッシュ7に前記駆動軸4の前端部を挿入し回転可能に軸承している。一方、従動軸5を挿入すべき軸受孔13bにも第1のブッシュ7を嵌装していて、この第1のブッシュ7に前記従動軸5の前端部を挿入し回転可能に軸承している。これら軸受孔13a、13bの断面形状は、その長手方向の全域にわたって同径の円形状である。   As described above, the front bearing case 13 is arranged between the front cover 12 and the drive gear 2 and the driven gear 3. A first bush 7 is fitted in the bearing hole 13a into which the drive shaft 4 is to be inserted, and a front end portion of the drive shaft 4 is inserted into the first bush 7 so as to be rotatably supported. On the other hand, the first bush 7 is also fitted into the bearing hole 13b into which the driven shaft 5 is to be inserted, and the front end portion of the driven shaft 5 is inserted into the first bush 7 so as to be rotatably supported. . The cross-sectional shape of these bearing holes 13a and 13b is a circular shape having the same diameter over the entire area in the longitudinal direction.

前記リアカバー14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11aの後側開口面を閉塞する。   The rear cover 14 is detachably mounted on the body 11 with bolts or the like, for example, and closes the rear opening surface of the gear housing chamber 11a.

前記リアベアリングケース15は、上述したようにリアカバー14と前記駆動歯車2及び従動歯車3との間に配してなる。駆動軸4を挿入すべき軸受孔15aには第2のブッシュ8を嵌装し、この第2のブッシュ8に前記駆動軸4の後端部を挿入し回転可能に軸承している。一方、従動軸5を挿入すべき軸受孔15bにも第2のブッシュ8を嵌装していて、この第2のブッシュ8に前記従動軸5の後端部を挿入し回転可能に軸承している。これら軸受孔15a、15bの断面形状は、本実施形態では、後方に向かうにつれ小径となる円形状である。換言すれば、軸受孔15a、15bは、後端側に向かうに従い小径となるテーパ状をなしている。そして、前記軸受孔15a、15bの側面は、駆動軸4及び従動軸5の後端部の側面と平行、換言すれば駆動軸4及び従動軸5の後端部の側面と等間隔の隙間を隔てて対向していて、この隙間に前記第2のブッシュ8を挿入している。この第2のブッシュ8の断面形状も、後方に向かうにつれ小径となる円形状である。すなわち、第2のブッシュ8も、後端側に向かうに従い小径となるテーパ状をなしている。   As described above, the rear bearing case 15 is arranged between the rear cover 14 and the drive gear 2 and the driven gear 3. A second bush 8 is fitted into the bearing hole 15a into which the drive shaft 4 is to be inserted, and a rear end portion of the drive shaft 4 is inserted into the second bush 8 so as to be rotatably supported. On the other hand, the second bush 8 is also fitted into the bearing hole 15b into which the driven shaft 5 is to be inserted, and the rear end portion of the driven shaft 5 is inserted into the second bush 8 so as to be rotatably supported. Yes. In the present embodiment, the cross-sectional shape of the bearing holes 15a and 15b is a circular shape having a smaller diameter toward the rear. In other words, the bearing holes 15a and 15b have a tapered shape with a smaller diameter toward the rear end side. The side surfaces of the bearing holes 15a and 15b are parallel to the side surfaces of the rear end portions of the drive shaft 4 and the driven shaft 5, in other words, the gaps are equidistant from the side surfaces of the rear end portions of the drive shaft 4 and the driven shaft 5. The second bush 8 is inserted into the gap. The cross-sectional shape of the second bush 8 is also a circular shape having a smaller diameter as it goes rearward. That is, the second bush 8 also has a taper shape with a smaller diameter toward the rear end side.

一方、側板6は、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。   On the other hand, the side plate 6 is disposed at two locations so as to be in contact with both side surfaces 2a and 3a of the drive gear 2 and the driven gear 3, and seals the side surfaces 2a and 3a of the drive gear 2 and the driven gear 3, respectively. Is.

この歯車ポンプP1は、一端を外部に延出させてなる前記駆動軸4を介して前記駆動歯車2及び従動歯車3を同期逆回転駆動した場合に、前記吸込口と前記吐出口との間で高低圧差が生じ、前記駆動歯車2及び従動歯車3の歯体同士が漸次離反する側のボディ11内空間、つまり前記吸込口11d側が低圧領域になるとともに、歯体同士が漸次噛合する側のボディ11内空間、つまり吐出口側が高圧領域になる。そして、吸込口より導入した作動液を、前記駆動歯車2及び従動歯車3の歯先とケーシング1の内周との間に閉成される容積空間に閉じ込めて吐出口にまで導き吐出するポンプ作用を営むようにしている。なお、この歯車ポンプP1は、吐出口11eより高圧の作動液を導入し、これにより前記駆動軸4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11d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。   When the drive gear 2 and the driven gear 3 are driven synchronously and reversely via the drive shaft 4 having one end extended to the outside, the gear pump P1 is interposed between the suction port and the discharge port. A body 11 on the side where the tooth bodies of the drive gear 2 and the driven gear 3 are gradually separated from each other, that is, the suction port 11d side becomes a low pressure region, and the body on the side where the tooth bodies gradually mesh with each other. 11 space, that is, the discharge port side becomes a high pressure region. Then, the pumping action is such that the hydraulic fluid introduced from the suction port is confined in a volume space closed between the tooth tips of the drive gear 2 and the driven gear 3 and the inner periphery of the casing 1 and led to the discharge port to be discharged. To run. The gear pump P1 introduces high-pressure hydraulic fluid from the discharge port 11e, thereby taking out rotational torque from the drive shaft 4 and driving an external load, and at the same time, reducing the low-pressure hydraulic fluid to the suction port 11d. Needless to say, it can also be made to function as a gear motor that performs the motor action of discharging from the nozzle.

ここで、この歯車ポンプP1をポンプとして作動させた場合、上述したように、駆動歯車2と従動歯車3との間の噛合部から、駆動歯車2は後方に向かう作用、従動歯車3は前方に向かう作用をそれぞれ受ける。また、これら駆動歯車2及び従動歯車3は、作動液の液圧を受けて後方に向かう作用を受ける。これら噛合部から受ける作用及び作動液の液圧による作用を合わせて、駆動歯車2は後方に向かう大きなスラスト力、従動歯車3は駆動歯車2が受けるものよりは小さな後方に向かうスラスト力をそれぞれ受ける。   Here, when this gear pump P1 is operated as a pump, as described above, the driving gear 2 acts backward from the meshing portion between the driving gear 2 and the driven gear 3, and the driven gear 3 moves forward. Receiving each action. In addition, the drive gear 2 and the driven gear 3 are subjected to an action directed rearward under the hydraulic pressure of the hydraulic fluid. The driving gear 2 receives a large thrust force toward the rear, and the driven gear 3 receives a thrust force toward the rear that is smaller than that received by the driving gear 2 by combining the effects received from the meshing portion and the hydraulic pressure of the hydraulic fluid. .

そして、これら駆動歯車2及び従動歯車3が受けるスラスト力は、駆動軸4及び従動軸5の後端部、第2のブッシュ8、及びリアベアリングケース15の軸受孔15a、15bがいずれもテーパ形状をなしているので、駆動軸4及び従動軸5の後端部の側面から第2のブッシュ8に伝達され、第2のブッシュ8からさらにリアベアリングケース15を経てリアカバー14に伝達される。そして、このリアカバー14をボディ11に装着するためのボルトBが最終的にスラスト力を受ける。   The thrust force received by the drive gear 2 and the driven gear 3 is such that the rear end portions of the drive shaft 4 and the driven shaft 5, the second bush 8, and the bearing holes 15 a and 15 b of the rear bearing case 15 are all tapered. Therefore, the signal is transmitted from the side surfaces of the rear end portions of the drive shaft 4 and the driven shaft 5 to the second bush 8 and further transmitted from the second bush 8 to the rear cover 14 via the rear bearing case 15. The bolt B for attaching the rear cover 14 to the body 11 finally receives a thrust force.

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、駆動軸4及び従動軸5の後端部、第2のブッシュ8、及びリアベアリングケース15の軸受孔15a、15bがいずれもテーパ形状をなしているので、これらが互いに接する部位が担うこととなり、後側の側板6は駆動歯車2及び従動歯車3の後側面を被覆し作動液のシールを行う機能のみを担うものとして設計することができる。従って、特殊な部材や作動液通路を追加する必要がなく、また容積性能の低下を伴うことなく、簡単な構成で側板6に大きなスラスト圧が作用することを防ぐことができる。   As described above, according to the configuration of the gear pump P <b> 1 according to the present embodiment, the rear end portions of the drive shaft 4 and the driven shaft 5, the second bush 8, and the bearing holes 15 a and 15 b of the rear bearing case 15. Since both of them are tapered, the parts where they are in contact with each other are responsible, and the rear side plate 6 covers only the rear surfaces of the drive gear 2 and the driven gear 3 and seals the hydraulic fluid only. Can be designed as a thing. Therefore, it is not necessary to add a special member or a hydraulic fluid passage, and it is possible to prevent a large thrust pressure from acting on the side plate 6 with a simple configuration without causing a decrease in volume performance.

次いで、本発明の第二実施形態を、図面を参照して説明する。なお、前述した第一実施形態に係るものに対応する各部位には、同一の名称及び符号を付している。   Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, the same name and code | symbol are attached | subjected to each site | part corresponding to what concerns on 1st embodiment mentioned above.

本実施形態に係る歯車ポンプP2は、図2に示すように、主として、歯車収納室11a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11a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に添接する側板6、6とを具備する。   As shown in FIG. 2, the gear pump P <b> 2 according to the present embodiment mainly includes a casing 1 having a gear housing chamber 11 a therein and a circumscribed portion that is housed and held in the gear housing chamber 11 a of the casing 1 and meshes with each other. A gear pair, that is, a drive gear 2 and a driven gear 3, and side plates 6 and 6 that are in contact with both side surfaces 2 a and 3 a of the gears 2 and 3 are provided.

以下、前述した第一実施形態に係る歯車ポンプP1との相違点についてのみ述べる。   Hereinafter, only differences from the gear pump P1 according to the first embodiment will be described.

本実施形態に係るケーシング1は、例えば、前記歯車収納室11aを有するとともにこの歯車収納室11aの後側他開口面を閉塞するボディ11と、歯車収納室11aの前側開口面を閉塞するカバーたるフロントカバー12とを備えている。   The casing 1 according to the present embodiment is, for example, a body 11 that has the gear housing chamber 11a and closes the other opening surface on the rear side of the gear housing chamber 11a, and a cover that blocks the front opening surface of the gear housing chamber 11a. A front cover 12 is provided.

ボディ11には、その内部に前記歯車対すなわち駆動歯車2及び従動歯車3を噛合状態で収容する略眼鏡状の前記歯車収納室11aを備えている。また、この歯車収納室11aの後方には、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11x、11yを設けている。前記駆動軸4を挿入すべき軸受孔11xには第2のブッシュ8を嵌装し、この第2のブッシュ8に前記駆動軸4の後端部を挿入し回転可能に軸承している。一方、従動軸5を挿入すべき軸受孔11yにも第2のブッシュ8を嵌装していて、この第2のブッシュ8に前記従動軸5の後端部を挿入し回転可能に軸承している。これら軸受孔11x、11yの断面形状は、本実施形態では、後方に向かうにつれ小径となる円形状である。そして、前記軸受孔11x、11yの側面は、駆動軸4及び従動軸5の後端部の側面と平行、換言すれば駆動軸4及び従動軸5の後端部の側面と等間隔の隙間を隔てて対向していて、この隙間に前記第2のブッシュ8を挿入している。そして、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との噛合ピッチ円における接線方向側の所定位置、すなわち前記駆動歯車2と従動歯車3との噛合ピッチ円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。そして、前記吸込口と前記噛合ピッチ円との間に、吸込通路を設けている。すなわち、このボディ11は、前述した第一実施形態に係るボディ11、リアカバー14及びリアベアリングケース15を一体に構成したものである。   The body 11 is provided with a substantially glasses-shaped gear housing chamber 11a for housing the gear pair, that is, the driving gear 2 and the driven gear 3 in an engaged state. Further, bearing holes 11x and 11y into which the drive shaft 4 and the driven shaft 5 can be respectively inserted are provided behind the gear housing chamber 11a. A second bush 8 is fitted into the bearing hole 11x into which the drive shaft 4 is to be inserted, and a rear end portion of the drive shaft 4 is inserted into the second bush 8 so as to be rotatably supported. On the other hand, the second bush 8 is fitted into the bearing hole 11y into which the driven shaft 5 is to be inserted, and the rear end portion of the driven shaft 5 is inserted into the second bush 8 so as to be rotatably supported. Yes. In the present embodiment, the cross-sectional shapes of the bearing holes 11x and 11y are circular shapes that become smaller in diameter toward the rear. The side surfaces of the bearing holes 11x and 11y are parallel to the side surfaces of the rear end portions of the drive shaft 4 and the driven shaft 5, in other words, the gaps are equidistant from the side surfaces of the rear end portions of the drive shaft 4 and the driven shaft 5. The second bush 8 is inserted into the gap. Although not shown, the body 11 has a predetermined position on the tangential side of the meshing pitch circle between the driving gear 2 and the driven gear 3, that is, the meshing pitch circle between the driving gear 2 and the driven gear 3. A suction port and a discharge port are respectively opened at positions facing the surface. A suction passage is provided between the suction port and the meshing pitch circle. That is, the body 11 is configured by integrally forming the body 11, the rear cover 14, and the rear bearing case 15 according to the first embodiment described above.

一方、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11aの開口面を閉塞するとともに、駆動軸4及び従動軸5を挿入すべき軸受孔12x、12yを有する。駆動軸4を挿入すべき軸受孔12xには第1のブッシュ7を嵌装し、この第1のブッシュ7に前記駆動軸4の前端部を挿入し回転可能に軸承している。一方、従動軸5を挿入すべき軸受孔12yにも第1のブッシュ7を嵌装していて、この第1のブッシュ7に前記従動軸5の前端部を挿入し回転可能に軸承している。これら軸受孔12x、12yの断面形状は、その長手方向の全域にわたって同径の円形状である。すなわち、このフロントカバー12は、前述した第一実施形態に係るフロントカバー12及びフロントベアリングケース13を一体に構成したものである。   On the other hand, the front cover 12 is detachably attached to the body 11 with bolts or the like, for example, closes the opening surface of the gear housing chamber 11a, and bearing holes 12x and 12y into which the drive shaft 4 and the driven shaft 5 are to be inserted. Have A first bush 7 is fitted in the bearing hole 12x into which the drive shaft 4 is to be inserted, and a front end portion of the drive shaft 4 is inserted into the first bush 7 so as to be rotatably supported. On the other hand, the first bush 7 is also fitted into the bearing hole 12y into which the driven shaft 5 is to be inserted, and the front end portion of the driven shaft 5 is inserted into the first bush 7 so as to be rotatably supported. . The cross-sectional shape of these bearing holes 12x and 12y is a circular shape having the same diameter over the entire region in the longitudinal direction. That is, the front cover 12 is configured by integrating the front cover 12 and the front bearing case 13 according to the first embodiment described above.

ここで、この歯車ポンプP2をポンプとして作動させた場合、上述したように、駆動歯車2と従動歯車3との間の噛合部から、駆動歯車2は後方に向かう作用、従動歯車3は前方に向かう作用をそれぞれ受ける。また、これら駆動歯車2及び従動歯車3は、作動液の液圧を受けて後方に向かう作用を受ける。これら噛合部から受ける作用及び作動液の液圧による作用を合わせて、駆動歯車2は後方に向かう大きなスラスト力、従動歯車3は駆動歯車2が受けるものよりは小さな後方に向かうスラスト力をそれぞれ受ける。   Here, when this gear pump P2 is operated as a pump, as described above, the driving gear 2 acts backward from the meshing portion between the driving gear 2 and the driven gear 3, and the driven gear 3 moves forward. Receiving each action. In addition, the drive gear 2 and the driven gear 3 are subjected to an action directed rearward under the hydraulic pressure of the hydraulic fluid. The driving gear 2 receives a large thrust force toward the rear, and the driven gear 3 receives a thrust force toward the rear that is smaller than that received by the driving gear 2 by combining the effects received from the meshing portion and the hydraulic pressure of the hydraulic fluid. .

そして、これら駆動歯車及び従動歯車が受けるスラスト力は、駆動軸4及び従動軸5の後端部、第2のブッシュ8、及びボディ11の軸受孔11x、11yがいずれもテーパ形状をなしているので、駆動軸4及び従動軸5の後端部の側面から第2のブッシュ8に伝達され、第2のブッシュ8からさらにボディ11に伝達される。そして、このボディ11とフロントカバー12とを結合するためのボルトBが最終的にスラスト力を受ける。   The thrust force received by the drive gear and the driven gear is such that the rear end portions of the drive shaft 4 and the driven shaft 5, the second bush 8, and the bearing holes 11x and 11y of the body 11 are all tapered. Therefore, it is transmitted from the side surface of the rear end portion of the drive shaft 4 and the driven shaft 5 to the second bush 8 and further transmitted from the second bush 8 to the body 11. Then, the bolt B for connecting the body 11 and the front cover 12 finally receives a thrust force.

以上に述べたように、本実施形態に係る歯車ポンプP2の構成によれば、駆動軸4及び従動軸5の後端部、第2のブッシュ8、及びボディ11の軸受孔11x、11yがいずれもテーパ形状をなしているので、これらが互いに接する部位が担うこととなり、後側の側板6は駆動歯車2及び従動歯車3の後側面を被覆し作動液のシールを行う機能のみを担うものとして設計することができる。従って、特殊な部材や作動液通路を追加する必要がなく、また容積性能の低下を伴うことなく、簡単な構成で側板6に大きなスラスト圧が作用することを防ぐことができる。   As described above, according to the configuration of the gear pump P2 according to the present embodiment, the rear end portions of the drive shaft 4 and the driven shaft 5, the second bush 8, and the bearing holes 11x and 11y of the body 11 are Since these are also tapered, the parts where they are in contact with each other are responsible, and the rear side plate 6 covers only the rear side surfaces of the drive gear 2 and the driven gear 3 and serves only to seal the hydraulic fluid. Can be designed. Therefore, it is not necessary to add a special member or a hydraulic fluid passage, and it is possible to prevent a large thrust pressure from acting on the side plate 6 with a simple configuration without causing a decrease in volume performance.

以下、本発明の第三実施形態を、図面を参照して説明する。なお、前述した第一実施形態に係るものに対応する各部位には、同一の名称及び符号を付している。   Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. In addition, the same name and code | symbol are attached | subjected to each site | part corresponding to what concerns on 1st embodiment mentioned above.

本実施形態に係る歯車ポンプP3は、図3に示すように、主として、歯車収納室11a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11a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に添接する側板6、6とを具備する。   As shown in FIG. 3, the gear pump P <b> 3 according to the present embodiment mainly includes a casing 1 having a gear housing chamber 11 a therein, and a circumscribed portion that is housed and held in the gear housing chamber 11 a of the casing 1 and meshes with each other. A gear pair, that is, a drive gear 2 and a driven gear 3, and side plates 6 and 6 that are in contact with both side surfaces 2 a and 3 a of the gears 2 and 3 are provided.

以下、前述した第一実施形態に係る歯車ポンプP1との相違点についてのみ述べる。   Hereinafter, only differences from the gear pump P1 according to the first embodiment will be described.

前記駆動軸4及び従動軸5は、その断面形状が長手方向の略全域にわたって同径の円形となる円柱状をなしている。   The drive shaft 4 and the driven shaft 5 have a cylindrical shape whose cross-sectional shape is a circle having the same diameter over substantially the entire region in the longitudinal direction.

一方、前記リアベアリングケース15の駆動軸4を挿入すべき軸受孔15a、及び従動軸5を挿入すべき軸受孔15bにはそれぞれ第2のブッシュ9を嵌装し、この第2のブッシュ9に前記駆動軸4の後端部及び前記従動軸5の後端部を挿入し回転可能に軸承している。これら軸受孔15a、15bの断面形状は、本実施形態では、その長手方向の全域にわたって同径の円形状である。そして、前記第2のブッシュ9は、駆動軸4及び従動軸5の後端部の側面と等間隔の隙間を隔てて対向しているとともに、これら駆動軸4及び従動軸5の後端部の側面、及びこれら駆動軸4及び従動軸5の後端面を被覆している。   On the other hand, a second bush 9 is fitted into the bearing hole 15a into which the drive shaft 4 of the rear bearing case 15 is to be inserted and the bearing hole 15b into which the driven shaft 5 is to be inserted. A rear end portion of the drive shaft 4 and a rear end portion of the driven shaft 5 are inserted and rotatably supported. In the present embodiment, the cross-sectional shape of the bearing holes 15a and 15b is a circular shape having the same diameter over the entire region in the longitudinal direction. The second bush 9 is opposed to the side surfaces of the rear end portions of the drive shaft 4 and the driven shaft 5 with an equal gap therebetween, and at the rear end portions of the drive shaft 4 and the driven shaft 5. The side surfaces and the rear end surfaces of the drive shaft 4 and the driven shaft 5 are covered.

ここで、この歯車ポンプP3をポンプとして作動させた場合、上述したように、駆動歯車2と従動歯車3との間の噛合部から、駆動歯車2は後方に向かう作用、従動歯車3は前方に向かう作用をそれぞれ受けるように構成している。また、これら駆動歯車2及び従動歯車3は、作動液の液圧を受けて後方に向かう作用を受ける。これら噛合部から受ける作用及び作動液の液圧による作用を合わせて、駆動歯車2は後方に向かう大きなスラスト力、従動歯車3は駆動歯車2が受けるものよりは小さな後方に向かうスラスト力をそれぞれ受ける。   Here, when this gear pump P3 is operated as a pump, as described above, the driving gear 2 acts backward from the meshing portion between the driving gear 2 and the driven gear 3, and the driven gear 3 moves forward. It is configured to receive each action. In addition, the drive gear 2 and the driven gear 3 are subjected to an action directed rearward under the hydraulic pressure of the hydraulic fluid. The driving gear 2 receives a large thrust force toward the rear, and the driven gear 3 receives a thrust force toward the rear that is smaller than that received by the driving gear 2 by combining the effects received from the meshing portion and the hydraulic pressure of the hydraulic fluid. .

そして、これら駆動歯車2及び従動歯車3が受けるスラスト力は、駆動軸4及び従動軸5の後端面からそれぞれ第2のブッシュ9を経てリアリアベアリングケース15に作用し、さらにリアカバー14に伝達される。そして、このリアカバー14をボディ11とに装着するためのボルトBが最終的にスラスト力を受ける。   The thrust forces received by the drive gear 2 and the driven gear 3 act on the rear rear bearing case 15 from the rear end surfaces of the drive shaft 4 and the driven shaft 5 through the second bushes 9 and are further transmitted to the rear cover 14. . Then, the bolt B for attaching the rear cover 14 to the body 11 finally receives a thrust force.

以上に述べたように、本実施形態に係る歯車ポンプP3の構成によれば、第2のブッシュ9が駆動軸4及び従動軸5の後端面を被覆しているので、駆動歯車2及び従動歯車3が受けるスラスト力を受ける機能は、第2のブッシュ9と対向する部位が担うこととなる。従って、後側の側板6は駆動歯車2及び従動歯車3の後側面を被覆し作動液のシールを行う機能のみを担うものとして設計することができる。このことにより、特殊な部材や作動液通路を追加する必要がなく、また容積性能の低下を伴うことなく、簡単な構成で側板6に大きなスラスト圧が作用することを防ぐことができる。   As described above, according to the configuration of the gear pump P3 according to the present embodiment, the second bush 9 covers the rear end surfaces of the drive shaft 4 and the driven shaft 5, and thus the drive gear 2 and the driven gear. The function of receiving the thrust force received by 3 is borne by the portion facing the second bush 9. Therefore, the rear side plate 6 can be designed to cover only the rear side surfaces of the drive gear 2 and the driven gear 3 and perform the function of sealing the hydraulic fluid. As a result, it is not necessary to add a special member or hydraulic fluid passage, and it is possible to prevent a large thrust pressure from acting on the side plate 6 with a simple configuration without lowering the volume performance.

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、上述した第一及び第二実施形態では、駆動軸及び従動軸の双方の後端部をテーパ状に形成し、第三実施形態では駆動軸及び従動軸の双方の後端面をブッシュにより被覆しているが、駆動軸及び従動軸のうち一方の後端部をテーパ状に形成し、他方の後端面をブッシュにより被覆する態様を採用してもよい。   For example, in the first and second embodiments described above, the rear ends of both the drive shaft and the driven shaft are tapered, and in the third embodiment, the rear end surfaces of both the drive shaft and the driven shaft are covered with a bush. However, a mode in which one rear end portion of the drive shaft and the driven shaft is tapered and the other rear end surface is covered with a bush may be employed.

また、上述した第一及び第三実施形態において、フロントカバーとフロントベアリングケースとを一体に形成してもよく、リアカバーとリアベアリングケースとを一体に形成してもよい。   In the first and third embodiments described above, the front cover and the front bearing case may be formed integrally, or the rear cover and the rear bearing case may be formed integrally.

さらに、駆動軸及び従動軸のうち少なくとも一方の後端部をテーパ状に形成した上で、テーパ状に形成した軸の後端面をブッシュにより被覆する態様を採用してもよい。   Further, a mode in which at least one rear end portion of the drive shaft and the driven shaft is formed in a tapered shape, and the rear end surface of the tapered shaft is covered with a bush 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.

P1、P2、P3…歯車ポンプ
1…ケーシング
11a…歯車収納室
11x、11y…軸受孔
15a、15b…軸受孔
2…駆動歯車
3…従動歯車
4…駆動軸
5…従動軸
6…側板
8、9…(第2の)ブッシュ
P1, P2, P3 ... gear pump 1 ... casing 11a ... gear housing chamber 11x, 11y ... bearing hole 15a, 15b ... bearing hole 2 ... drive gear 3 ... driven gear 4 ... drive shaft 5 ... driven shaft 6 ... side plate 8, 9 ... (second) bush

Claims (2)

互いに噛み合わせてなる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歯車対と、この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歯車を軸支する駆動軸及び前記従動歯車を軸支する従動軸を収納するための軸受孔を有するケーシングと、前記歯車対の各歯車の両側面に添接する側板とを具備する歯車ポンプ又はモータであって、
前記駆動軸及び従動軸の運転時に発生するスラスト作用が向かう側の一端部の形状を先端側に向かうに従い小径となる形状としているとともに、前記ケーシングの軸受孔の側面を、前記駆動軸及び従動軸の一端部の側面とほぼ平行な形状としていることを特徴とする歯車ポンプ又はモータ。
A gear pair consisting of a drive gear and a driven gear each utilizing helical gears meshed with each other, a gear housing chamber for housing the gear pair, and a drive shaft and a driven shaft for supporting the drive gear. A gear pump or motor comprising a casing having a bearing hole for housing a driven shaft that supports a gear, and side plates that are in contact with both side surfaces of each gear of the gear pair,
The shape of the one end portion on the side toward which the thrust action that occurs during operation of the drive shaft and the driven shaft is reduced is a shape that becomes smaller in diameter toward the distal end side, and the side surface of the bearing hole of the casing is the drive shaft and the driven shaft A gear pump or motor characterized by having a shape substantially parallel to a side surface of one end of the motor.
互いに噛み合わせてなる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歯車対と、この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歯車を軸支する駆動軸及び前記従動歯車を軸支する従動軸を収納するための軸受孔を有するケーシングと、前記歯車対の各歯車の両側面に添接する側板とを具備する歯車ポンプ又はモータであって、
前記駆動軸及び従動軸の運転時に発生するスラスト作用が向かう側の一端部と前記ケーシングの軸受孔との間に、前記駆動軸及び従動軸の一端部の側面及び端面に対向するブッシュをさらに備えていることを特徴とする歯車ポンプ又はモータ。
A gear pair consisting of a drive gear and a driven gear each utilizing helical gears meshed with each other, a gear housing chamber for housing the gear pair, and a drive shaft and a driven shaft for supporting the drive gear. A gear pump or motor comprising a casing having a bearing hole for housing a driven shaft that supports a gear, and side plates that are in contact with both side surfaces of each gear of the gear pair,
A bush is provided between one end of the drive shaft and the driven shaft and a bearing hole of the casing, which faces the thrust action generated during operation of the drive shaft and the driven shaft. A gear pump or motor.
JP2011149568A 2011-07-05 2011-07-05 Gear pump or motor Active JP5724691B2 (en)

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