JP2015175254A - Geared pump or geared motor - Google Patents

Geared pump or geared motor Download PDF

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JP2015175254A
JP2015175254A JP2014050748A JP2014050748A JP2015175254A JP 2015175254 A JP2015175254 A JP 2015175254A JP 2014050748 A JP2014050748 A JP 2014050748A JP 2014050748 A JP2014050748 A JP 2014050748A JP 2015175254 A JP2015175254 A JP 2015175254A
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gear
housing chamber
seal
pump
pressure side
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勇紀 萩野
Yuki Hagino
勇紀 萩野
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Shimadzu Corp
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Shimadzu Corp
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Abstract

PROBLEM TO BE SOLVED: To reduce disadvantages such as poor motion of equipment accompanied by reduction in performance due to re-wiping when a load overcoming an upper limit of a pump application range is applied to a high pressure port.SOLUTION: This invention relates to either a geared pump or a geared motor comprising circumscription gear pairs 2, 3; a casing including a body 11 formed with a gear storing chamber 11a storing circumscription gear pairs 2, 3 inside of it, a cover for closing the gear storing chamber 11a of the body 11 and a high pressure port 1Y and a low pressure port 1X each of which is communicated with the gear storing chamber 11a; and a seal surface 9a arranged near the low pressure port 1X in the gear storing chamber 11a, opposing against tips of the circumscription gear pairs 2, 3 and continuous to an inside surface 11a1 of the gear storing chamber 11a. This invention further comprises a configuration of a seal motion mechanism 10 for moving a seal block 9 toward the circumscription gear pairs 2, 3.

Description

本発明は、産業用機械等に用いられ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 used for an industrial machine or the like.

従来より、液圧回路を有する産業用機械等において、ボディの内部に外接歯車対を収納する歯車収納室を備えているとともに、この歯車収納室にそれぞれ連通する高圧側ポート及び低圧側ポートを有す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をポンプとして利用する際には、低圧側ポートから導入された作動液が歯車収納室の内壁と外接歯車対の歯との間の空間を経て高圧側ポートに導かれる(例えば、特許文献1を参照)。   2. Description of the Related Art Conventionally, an industrial machine or the like having a hydraulic circuit has a gear storage chamber that stores a pair of external gears inside a body, and has a high-pressure side port and a low-pressure side port that communicate with the gear storage chamber, respectively. Gear pumps or motors are widely used. When such a gear pump or motor is used as a pump, the working fluid introduced from the low pressure side port is guided to the high pressure side port through the space between the inner wall of the gear housing chamber and the teeth of the external gear pair. (For example, see Patent Document 1).

ここで、ポンプとしての容積効率は、歯車収納室の低圧側内壁と外接歯車対の歯先との間の隙間から漏れる作動液の量、換言すれば前記隙間の幅によって大きく左右される。この隙間の幅は、出荷前に高圧側ポートの圧力をポンプ使用範囲の上限とした状態で運転することにより外接歯車対の歯先で歯車収納室の低圧側内壁の一部を切削することにより決定される。   Here, the volumetric efficiency of the pump is greatly influenced by the amount of hydraulic fluid that leaks from the gap between the low pressure side inner wall of the gear housing chamber and the tooth tip of the external gear pair, in other words, the width of the gap. The width of the gap is determined by cutting a part of the low pressure side inner wall of the gear housing chamber at the tooth tip of the external gear pair by operating with the pressure of the high pressure side port set to the upper limit of the pump usage range before shipping. It is determined.

特開2000−179468号公報JP 2000-179468 A

ところが、サージ圧力の発生等によりポンプ使用範囲の上限を上回る負荷が高圧側ポートに加わると、外接歯車対が低圧側に強く押圧され、外接歯車対の歯先により歯車収納室の内壁の一部がさらに切削される。すると、それ以後の運転時において歯車収納室の内壁と外接歯車対の歯先との間の隙間が大きくなる再ワイプと呼ばれる現象が発生し、性能が低下する。さらに、性能の低下の度合いや歯車ポンプ(又はモータ)を搭載する機器の種類によっては、機器の移動が困難となる。   However, if a load exceeding the upper limit of the pump operating range is applied to the high pressure side port due to the occurrence of surge pressure, etc., the external gear pair is strongly pressed to the low pressure side, and a part of the inner wall of the gear housing chamber is caused by the tooth tip of the external gear pair. Is further cut. Then, during a subsequent operation, a phenomenon called “rewiping” occurs in which a gap between the inner wall of the gear housing chamber and the tooth tip of the external gear pair is increased, and the performance is deteriorated. Furthermore, depending on the degree of performance degradation and the type of equipment on which the gear pump (or motor) is mounted, it becomes difficult to move the equipment.

本発明は以上の点に着目し、ポンプ使用範囲の上限を上回る負荷が高圧側ポートに加わった際の再ワイプによる性能低下に伴う機器の移動困難等の不具合を軽減することを目的とする。   The present invention pays attention to the above points, and an object of the present invention is to reduce problems such as difficulty in moving equipment due to performance deterioration due to rewiping when a load exceeding the upper limit of the pump usage range is applied to the high-pressure side port.

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、外接歯車対と、内部に外接歯車対を収納する歯車収納室が形成されたボディ、ボディの歯車収納室を閉塞するカバー、前記歯車収納室にそれぞれ連通する高圧側ポート及び低圧側ポートを有するケーシングと、前記歯車収納室内における前記低圧側ポートの近傍に配され外接歯車対の歯先に対向するとともに前記歯車収納室の内側面に連続するシール面を備えたシールブロックと、このシールブロックを外接歯車対に向けて移動させるためのシール移動機構とを具備するものである。   In order to solve the above problems, a gear pump or a motor according to the present invention has a configuration as described below. That is, the gear pump or motor according to the present invention communicates with the external gear pair, the body in which the gear housing chamber for housing the external gear pair is formed, the cover for closing the gear housing chamber of the body, and the gear housing chamber. A casing having a high-pressure side port and a low-pressure side port, and a seal surface disposed in the vicinity of the low-pressure side port in the gear housing chamber, facing a tooth tip of the external gear pair and continuing to the inner surface of the gear housing chamber. And a seal moving mechanism for moving the seal block toward the external gear pair.

このようなものであれば、再ワイプによる性能低下が発生した際にはシール移動機構によりシールブロックを外接歯車対に向けて移動させ、外接歯車対の歯先とシール面との間の隙間を小さくし、性能を回復することにより、少なくとも機器を修理箇所まで移動させるまでの間、所望の性能で運転することができる。   If this is the case, when the performance deterioration due to rewiping occurs, the seal block is moved toward the external gear pair by the seal moving mechanism, and the clearance between the tooth tip of the external gear pair and the seal surface is increased. By reducing the size and restoring the performance, it is possible to operate at a desired performance at least until the device is moved to the repair point.

本発明によれば、ポンプ使用範囲の上限を上回る負荷が高圧側ポートに加わった際の再ワイプによる性能低下に伴う機器の移動困難等の不具合を軽減することができる。   ADVANTAGE OF THE INVENTION According to this invention, malfunctions, such as the difficulty of the movement of an apparatus accompanying the performance fall by the rewiping when the load exceeding the upper limit of a pump use range is added to the high voltage | pressure side port, can be reduced.

本発明の一実施形態に係る歯車ポンプの構成を示す概略図。Schematic which shows the structure of the gear pump which concerns on one Embodiment of this invention. 図1におけるA−A断面図。AA sectional drawing in FIG. 同実施形態に係る歯車及びシールブロックの側面図。The side view of the gearwheel and seal block which concern on the same embodiment.

本発明の一実施形態を、図1〜図3を参照しつつ以下に述べる。   An 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P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に添接する可動側板6、6とを具備する。   As shown in FIG. 1, the gear pump P 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 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 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 in which a plurality of tooth bodies are provided at predetermined intervals along the outer peripheral surface. 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、例えば、前記歯車収納室11aを有するボディ11と、この歯車収納室11aの開口面を閉塞するカバーたるフロントカバー12と、前記歯車収納室11aの開口面を閉塞するカバーたるリアカバー13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を噛合状態で収容する歯車収納室11aが形成されている。また、ボディ11には、前記歯車収納室にそれぞれ連通する低圧側ポート1X及び高圧側ポート1Y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11a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が形成されている。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。同様に、前記リアカバー13も、前記ボディ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13a、13b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13a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の他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13b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の他端部を挿入し回転可能に軸承している。   The casing 1 includes, for example, a body 11 having the gear housing chamber 11a, a front cover 12 serving as a cover for closing the opening surface of the gear housing chamber 11a, and a rear cover 13 serving as a cover for closing the opening surface of the gear housing chamber 11a. It is composed of The body 11 is formed with a gear housing chamber 11a for housing the gear pair, that is, the driving gear 2 and the driven gear 3 in an engaged state. The body 11 is opened with a low-pressure side port 1X and a high-pressure side port 1Y respectively communicating with the gear housing chamber. 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, and a bearing hole into which the drive shaft 4 and the driven shaft 5 can be respectively fitted. 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. Similarly, the rear cover 13 is also detachably attached to the body 11 with a bolt or the like and closes the rear opening surface of the gear housing chamber 11a, and the drive shaft 4 and the driven shaft 5 can be respectively inserted thereinto. Bearing holes 13a and 13b are formed. A bush 7 is fitted in the bearing hole 13a near the position where the drive gear 2 is to be inserted, and the other 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 also fitted in the bearing hole 13b near the position where the driven gear 3 is to be inserted, and the other 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。また、この可動側板6の駆動歯車2及び従動歯車3と反対側を向く非摺動面6bにはガスケット溝6yを設けていて、このガスケット溝6yにガスケット8を嵌め入れるようにしている。   As shown in FIG. 1, the movable side plate 6 is disposed at two locations so as to be brought into contact with both side surfaces 2 a and 3 a of the drive gear 2 and the driven gear 3, and the side surfaces 2 a and 3 a of the drive gear 2 and the driven gear 3. It is for sealing each. Further, a gasket groove 6y is provided on the non-sliding surface 6b of the movable side plate 6 facing away from the drive gear 2 and the driven gear 3, and the gasket 8 is fitted into the gasket groove 6y.

その上で本実施形態では、図2に示すように、歯車収納室11a内の低圧側ポート1X近傍に設けられ、駆動歯車2又は従動歯車3の歯先に対向するとともに前記歯車収納室11aの内側面11a1に連続するシール面9aを備えたシールブロック9を配している。ここで、図3に示すように、ボディ11の幅寸法、シールブロック9の幅寸法並びに駆動歯車2及び前記従動歯車3の歯幅は等しい値d1に設定している。また、シールブロック9の背面と歯車収納室11aとの間には、液漏れを抑制すべくシール部材91を配している。さらに、図2に示すように、このシールブロック9のシール面9aが駆動歯車2又は従動歯車3の歯先によって切削されることによりシール面9aと歯先との間の隙間が大きくなる再ワイプが発生した際にシールブロック9を駆動歯車2及び従動歯車3に向けて移動させるためのシール移動機構10も設けている。このシール移動機構10は、ボディ11に設けられ歯車収納室11aに連通する雌ねじ孔11xと、この雌ねじ孔11xに螺合するとともに先端部がシールブロック9に接し基端部に操作部であるレンチ穴101aを有する雄ねじ部材101と、ボディ11の外側において雄ねじ部材101に螺合可能なナット102とを備えている。前記雄ねじ部材101は、レンチ穴101aを備えナット102と螺合する第1の雄ねじ部102bと、第1の雄ねじ部102bから軸方向に離間し雌ねじ孔11xに螺合する第2の雄ねじ部102cと、これら第1及び第2の雄ねじ部102b、102cの間に設けられ外径が第1及び第2の雄ねじ部102b、102cより小さいくびれ部104dとを備えている。雄ねじ部材101のくびれ部104dと雌ねじ孔11xとの間には、雌ねじ孔11xを介した作動液の漏出を抑制するための作動液漏出抑制部材103を配している。作動液漏出抑制部材103としては、Oリング等を採用できる。そして、前記レンチ穴101a内に六角レンチを差し込み、雄ねじ部材101を雌ねじ孔11xに螺着させるための回転操作を加えることにより、雄ねじ部材101の先端によりシールブロック9を駆動歯車2及び従動歯車3に向けて押圧し、シール面9aと歯先との隙間を小さくすることができる。   In addition, in the present embodiment, as shown in FIG. 2, it is provided in the vicinity of the low-pressure side port 1X in the gear housing chamber 11a, faces the tooth tip of the drive gear 2 or the driven gear 3, and the gear housing chamber 11a. A seal block 9 having a seal surface 9a continuous with the inner surface 11a1 is disposed. Here, as shown in FIG. 3, the width dimension of the body 11, the width dimension of the seal block 9, and the tooth widths of the drive gear 2 and the driven gear 3 are set to the same value d1. Further, a seal member 91 is disposed between the back surface of the seal block 9 and the gear housing chamber 11a so as to suppress liquid leakage. Further, as shown in FIG. 2, the wiping process in which the clearance between the seal surface 9 a and the tooth tip is increased by cutting the seal surface 9 a of the seal block 9 by the tooth tip of the drive gear 2 or the driven gear 3. A seal moving mechanism 10 is also provided for moving the seal block 9 toward the drive gear 2 and the driven gear 3 when this occurs. The seal moving mechanism 10 includes a female screw hole 11x provided in the body 11 and communicating with the gear housing chamber 11a, and a wrench that is screwed into the female screw hole 11x and that has a distal end portion in contact with the seal block 9 and an operation portion at the proximal end portion. A male screw member 101 having a hole 101a and a nut 102 that can be screwed to the male screw member 101 outside the body 11 are provided. The male screw member 101 includes a first male screw portion 102b having a wrench hole 101a and screwed into the nut 102, and a second male screw portion 102c spaced axially from the first male screw portion 102b and screwed into the female screw hole 11x. And a constricted portion 104d provided between the first and second male screw portions 102b and 102c and having an outer diameter smaller than the first and second male screw portions 102b and 102c. Between the constricted portion 104d of the male screw member 101 and the female screw hole 11x, a hydraulic fluid leakage suppressing member 103 for suppressing leakage of the hydraulic fluid through the female screw hole 11x is disposed. As the hydraulic fluid leakage suppressing member 103, an O-ring or the like can be employed. Then, a hexagon wrench is inserted into the wrench hole 101a, and a rotation operation for screwing the male screw member 101 into the female screw hole 11x is applied, so that the seal block 9 is driven by the tip of the male screw member 101 with the drive gear 2 and the driven gear 3 The gap between the seal surface 9a and the tooth tip can be reduced.

なお、本実施形態の歯車ポンプPは、高圧側ポート1Yから作動液を導入し、作動液圧により駆動歯車2及び従動歯車3を駆動しつつ作動液を低圧側ポート1Xから吐出する歯車モータとしても使用可能である。   The gear pump P of the present embodiment is a gear motor that introduces hydraulic fluid from the high-pressure side port 1Y and discharges the hydraulic fluid from the low-pressure side port 1X while driving the drive gear 2 and the driven gear 3 with hydraulic fluid pressure. Can also be used.

以上に述べたように、本実施形態によれば、再ワイプによる性能低下が発生した際に、シール移動機構10によりシールブロック9を駆動歯車2及び従動歯車3に向けて移動させ、駆動歯車2及び従動歯車3の歯先とシール面9aとの間の隙間を小さくし、性能を回復することにより、少なくとも機器を修理箇所まで移動させるまでの間、所望の性能で運転することができる。   As described above, according to the present embodiment, when the performance deterioration due to rewiping occurs, the seal moving mechanism 10 moves the seal block 9 toward the drive gear 2 and the driven gear 3 to thereby reduce the drive gear 2. Further, by reducing the gap between the tooth tip of the driven gear 3 and the seal surface 9a and restoring the performance, it is possible to operate at a desired performance at least until the device is moved to the repair location.

なお、本発明は以上に述べた実施形態に限らない。   The present invention is not limited to the embodiment described above.

例えば、シール移動機構は、上述したようなネジ機構を利用したものに限らず、先端部をシールブロックに衝き当てたピストンと、このピストンの基端部を収納するシリンダと、このシリンダ内に作動液圧を供給する液圧供給路を備えた液圧ピストン機構等、他の構成のものを用いてもよい。   For example, the seal moving mechanism is not limited to the one using the screw mechanism as described above, and a piston having a tip end abutted against the seal block, a cylinder for storing the base end portion of the piston, and an operation in the cylinder. Other configurations such as a hydraulic piston mechanism having a hydraulic pressure supply path for supplying hydraulic pressure may be used.

また、歯車ポンプ又は歯車モータのうち一方としてのみ使用可能なものに本発明を適用してももちろんよい。   Of course, the present invention may be applied to only one of the gear pump and the gear motor that can be used.

加えて、シールブロックの幅寸法と駆動歯車及び従動歯車の歯幅は、上述した実施形態のように等しい値に設定するのが望ましいが、必ずしも等しい値に設定する必要はない。   In addition, it is desirable to set the width dimension of the seal block and the tooth widths of the drive gear and the driven gear to the same value as in the above-described embodiment, but it is not always necessary to set the same value.

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。   In addition, various changes may be made without departing from the spirit of the present invention.

1…ケーシング
11a…歯車収納室
11…ボディ
12、13…カバー
2、3…外接歯車対
1X…低圧側ポート
1Y…高圧側ポート
9…シールブロック
10…シール移動機構
DESCRIPTION OF SYMBOLS 1 ... Casing 11a ... Gear storage chamber 11 ... Body 12, 13 ... Cover 2, 3 ... External gear pair 1X ... Low pressure side port 1Y ... High pressure side port 9 ... Seal block 10 ... Seal movement mechanism

Claims (1)

外接歯車対と、内部に外接歯車対を収納する歯車収納室が形成されたボディ、ボディの歯車収納室を閉塞するカバー、前記歯車収納室にそれぞれ連通する高圧側ポート及び低圧側ポートを有するケーシングと、前記歯車収納室内における前記低圧側ポートの近傍に配され外接歯車対の歯先に対向するとともに前記歯車収納室の内側面に連続するシール面を備えたシールブロックと、このシールブロックを外接歯車対に向けて移動させるためのシール移動機構とを具備する歯車ポンプ又はモータ。 Body having a gear housing chamber in which a gear housing chamber for housing the external gear pair is formed, a cover for closing the gear housing chamber of the body, a casing having a high pressure side port and a low pressure side port respectively communicating with the gear housing chamber A seal block provided in the vicinity of the low-pressure side port in the gear housing chamber and having a seal surface facing the tooth tips of the external gear pair and continuing to the inner surface of the gear housing chamber; A gear pump or motor comprising a seal moving mechanism for moving toward a gear pair.
JP2014050748A 2014-03-13 2014-03-13 Geared pump or geared motor Pending JP2015175254A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107178497A (en) * 2017-06-06 2017-09-19 中国北方车辆研究所 A kind of integrated flow oil circuit casting of conjuncted hydraulic pump motor
CN107228179A (en) * 2017-04-13 2017-10-03 天津市汇晶丰精密机械有限公司 A kind of deep-sea detecting motor
CN111173736A (en) * 2019-08-30 2020-05-19 重庆红宇精密工业有限责任公司 Gear pump with axial clearance compensation device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107228179A (en) * 2017-04-13 2017-10-03 天津市汇晶丰精密机械有限公司 A kind of deep-sea detecting motor
CN107178497A (en) * 2017-06-06 2017-09-19 中国北方车辆研究所 A kind of integrated flow oil circuit casting of conjuncted hydraulic pump motor
CN111173736A (en) * 2019-08-30 2020-05-19 重庆红宇精密工业有限责任公司 Gear pump with axial clearance compensation device

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