JP3668781B2 - Inscribed gear pump - Google Patents

Inscribed gear pump Download PDF

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Publication number
JP3668781B2
JP3668781B2 JP09025294A JP9025294A JP3668781B2 JP 3668781 B2 JP3668781 B2 JP 3668781B2 JP 09025294 A JP09025294 A JP 09025294A JP 9025294 A JP9025294 A JP 9025294A JP 3668781 B2 JP3668781 B2 JP 3668781B2
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Japan
Prior art keywords
internal gear
casing
sliding resistance
gear pump
pressure introduction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP09025294A
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Japanese (ja)
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JPH07293452A (en
Inventor
広道 上野
茂喜 萩原
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Daikin Industries Ltd
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Daikin Industries Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/101—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with a crescent-shaped filler element, located between the inner and outer intermeshing members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels

Description

【０００１】
【産業上の利用分野】
【０００２】
本願発明は、内接ギヤポンプに関するものである。
【従来の技術】
【０００３】
従来から良く知られている内接ギヤポンプとしては、特公昭６３ー５４９１１号公報に開示されているものがある。
【０００４】
この公知の内接ギヤポンプは、図６および図７に示すように、ケーシング１内に適宜のクリアランス２を介して回転自在に配設された内歯歯車３と、該内歯歯車３に対して偏心状態で噛合する外歯歯車４とを備えて構成されており、前記内歯歯車３と外歯歯車４とに囲まれる空間は、仕切板５によって吸入室６と吐出室７とに区画されている。符号８は外歯歯車４を回転駆動させるための回転軸、９は軸受である。
【発明が解決しようとする課題】
【０００５】
ところが、上記のような構造の内接ギヤポンプにおいては、内歯歯車３に作用する荷重は、内歯歯車３の外周面とケーシング１の内周面との間のクリアランス２ａに形成される油膜を介して支持することとなっている。
【０００６】
この場合、内歯歯車３とケーシング１の内側面との間にも若干のクリアランス２ｂが存在するところから、内歯歯車３を直接拘束するものはなく、内歯歯車３の傾きに対してはフリーの状態にある。
【０００７】
そのため、図７に鎖線で示すように、ケーシング１内の圧力バランスの崩れ等に起因して内歯歯車３が傾くという現象が生ずることがある。すると、内歯歯車３の外周縁がケーシング内面に対して片当たりを起こす。この片当たりにより局所的な荷重が増大し、異常摩耗や焼付きといった不具合が発生するおそれがある。この内歯歯車３の傾き現象を解消することが、内接ギヤポンプの耐久性を向上させる上で重要な課題となっている。
【０００８】
本願発明は、上記の点に鑑みてなされたもので、極めて簡易な手段によりケーシング内における内歯歯車の傾きを確実に防止し得るようにすることを目的とするものである。
【課題を解決するための手段】
【０００９】
本願発明の第１の基本構成は、ケーシング内に適宜のクリアランスを介して回転自在に配設された内歯歯車と、該内歯歯車に対して偏心状態で噛合する外歯歯車とを備えた内接ギヤポンプにおいて、前記ケーシング内側面における前記内歯歯車の一側面と対応する部分に、吐出圧力が導入される複数の圧力導入溝を形成するとともに、該圧力導入溝の開口面積を、吐出側では大きく、吸入側では小さくしたことを特徴としている。
【００１０】
本願発明の第２の基本構成は、ケーシング内に適宜のクリアランスを介して回転自在に配設された内歯歯車と、該内歯歯車に対して偏心状態で噛合する外歯歯車とを備えた内接ギヤポンプにおいて、前記内歯歯車の外周面と該内歯歯車の外周面に対応するケーシングの内周面とを、同一方向に同一角度で傾斜するテーパ面で構成したことを特徴としている。
【００１１】
本願発明の第１の基本構成において、前記内歯歯車における反圧力導入溝側の側面とケーシングにおける反圧力導入溝側の内側面との摺接面のいずれか一方に、摺動抵抗を低減する摺動抵抗低減手段を設けるのが好ましく、この場合において、前記摺動抵抗低減手段を、前記内歯歯車における反圧力導入溝側の側面に形成される場合においては該内歯歯車の回転方向と反対方向に向かうに従って求心方向に向かい、前記ケーシングにおける反圧力導入溝側の内側面に形成される場合においては前記内歯歯車の回転方向と同方向に向かうに従って求心方向に向かう多数のスパイラル溝とするのがより好ましい。
【００１２】
本願発明の第２の基本構成において、前記内歯歯車における大径側の側面とケーシングにおける前記内歯歯車の大径側側面に対応する内側面との摺接面のいずれか一方には、摺動抵抗を低減する摺動抵抗低減手段を設けるのが好ましく、この場合において、前記摺動抵抗低減手段を、前記内歯歯車における大径側の側面に形成される場合においては該内歯歯車の回転方向と反対方向に向かうに従って求心方向に向かい、前記ケーシングにおける前記内歯歯車の大径側側面に対応する内側面に形成される場合においては前記内歯歯車の回転方向と同方向に向かうに従って求心方向に向かう多数のスパイラル溝とするのがより好ましい。
【作用】
【００１３】
本願発明の第１の基本構成では、圧力導入溝に導入された吐出圧力が内歯歯車の一側面に作用するため、内歯歯車がケーシングにおける反圧力導入溝側の内側面に押し付けられることとなり、内歯歯車の傾きが防止される。しかも、圧力導入溝の開口面積を、吐出側では大きく、吸入側では小さくしているので、内歯歯車にかかるスラスト方向の荷重が、吐出側で大きく、吸入側で小さくなっていることに対応でき、内歯歯車にかかる押し付け力が均一化されることとなり、有害な片当たりが発生しなくなる。
【００１４】
本願発明の第２の基本構成では、内歯歯車にかかる半径方向の荷重がスラスト方向にも配分されるため、内歯歯車をケーシングの内側面へ押し付ける力が得られることとなり、内歯歯車の傾きが防止される。
【００１５】
本願発明の第１の基本構成において、内歯歯車における反圧力導入溝側の側面とケーシングにおける反圧力導入溝側の内側面との摺接面のいずれか一方に、摺動抵抗を低減する摺動抵抗低減手段を設けた場合、押し付けられた内歯歯車における反圧力導入溝側の側面とケーシングにおける反圧力導入溝側の内側面との間の摺動抵抗が低減される。この場合において、前記摺動抵抗低減手段を、前記内歯歯車における反圧力導入溝側の側面に形成される場合においては該内歯歯車の回転方向と反対方向に向かうに従って求心方向に向かい、前記ケーシングにおける反圧力導入溝側の内側面に形成される場合においては前記内歯歯車の回転方向と同方向に向かうに従って求心方向に向かう多数のスパイラル溝とすると、潤滑油を含む流体を圧送する場合、スパイラル溝内への潤滑油の侵入により潤滑性能も良好となる。
【００１６】
本願発明の第２の基本構成において、前記内歯歯車における大径側の側面とケーシングにおける前記内歯歯車の大径側側面に対応する内側面との摺接面のいずれか一方には、摺動抵抗を低減する摺動抵抗低減手段を設けた場合、押し付けられた内歯歯車における大径側の側面とケーシングにおける前記内歯歯車の大径側側面と対応する内側面との間の摺動抵抗が低減される。この場合において、前記摺動抵抗低減手段を、前記内歯歯車における大径側の側面に形成される場合においては該内歯歯車の回転方向と反対方向に向かうに従って求心方向に向かい、前記ケーシングにおける前記内歯歯車の大径側側面に対応する内側面に形成される場合においては前記内歯歯車の回転方向と同方向に向かうに従って求心方向に向かう多数のスパイラル溝とすると、潤滑油を含む流体を圧送する場合、スパイラル溝内への潤滑油の侵入により潤滑性能も良好となる。
【発明の効果】
【００１７】
本願発明によれば、ケーシング内における内歯歯車の傾きが極めて簡易な手段（例えば、圧力導入溝の形成、内歯歯車外周面とケーシング内周面とをテーパ形状とすること）によって確実に防止できるので、内歯歯車の片当たりが防止され、異常摩耗や焼付きが発生しなくなって信頼性が向上するという優れた効果がある。しかも、圧力導入溝の開口面積を、吐出側では大きく、吸入側では小さくしているので、内歯歯車にかかるスラスト方向の荷重が、吐出側で大きく、吸入側で小さくなっていることに対応でき、内歯歯車の側面にかかる押し付け力が均一化されるところから、有害な片当たりが発生せず、さらなる信頼性の向上が図れるという効果が得られる。
【００１８】
さらに、内歯歯車における反圧力導入溝側（あるいは、大径側）の側面とケーシングにおける反圧力導入溝側（あるいは、内歯歯車の大径側側面に対応する）内側面との摺接面のいずれか一方に、摺動抵抗を低減する摺動抵抗低減手段を設けた場合、押し付けられた内歯歯車における反圧力導入溝側の側面とケーシングにおける反圧力導入溝側の内側面との間の摺動抵抗が低減されるという効果がある。この場合において、前記摺動抵抗低減手段を、前記内歯歯車における反圧力導入溝側（あるいは、大径側）の側面に形成される場合においては該内歯歯車の回転方向と反対方向に向かうに従って求心方向に向かい、前記ケーシングにおける反圧力導入溝側（あるいは、内歯歯車の大径側側面に対応する）内側面に形成される場合においては前記内歯歯車の回転方向と同方向に向かうに従って求心方向に向かう多数のスパイラル溝とすると、潤滑油を含む流体を圧送する場合、スパイラル溝内への潤滑油の侵入により潤滑性能も良好となり、駆動力の低減に寄与するという効果がある。
【実施例】
【００１９】
以下、添付の図面を参照して、本願発明の幾つかの好適な実施例を説明する。
【００２０】
実施例１
図１ないし図３には、本願発明の実施例１にかかる内接ギヤポンプが示されている。
【００２１】
本実施例の内接ギヤポンプの主要構成は、従来技術の項において説明したものと同様であり、ケーシング１内に適宜のクリアランス２を介して回転自在に配設された内歯歯車３と、該内歯歯車３に対して偏心状態で噛合する外歯歯車４とを備えて構成されている。そして、前記内歯歯車３と外歯歯車４とに囲まれる空間は、仕切板５によって吸入室６と吐出室７とに区画されている。符号８は外歯歯車４を回転駆動させるための回転軸、９は軸受である。なお、吸入口および吐出口は図示省略されている。
【００２２】
しかして、本実施例の場合、前記ケーシング１の内側面１ａにおける前記内歯歯車３の一側面３ａと対応する部分には、吐出圧力Ｐが導入される複数（本実施例の場合、３個）の圧力導入溝１０，１１，１２が同一円周上に位置して等間隔（本実施例の場合、１２０°間隔）で形成されている（図２参照）。
【００２３】
前記圧力導入溝１０，１１，１２は、共に半径方向の幅を同一とされているが、周方向長さは、吐出側の圧力導入溝１０、中間部側の圧力導入溝１１、吸入側の圧力導入溝１２の順に小さくされている。つまり、圧力導入溝１０，１１，１２の開口面積Ｓ1，Ｓ2，Ｓ3は、Ｓ1＞Ｓ2＞Ｓ3とされているのである。このことにより、圧力導入溝１０，１１，１２から導入される圧力の内歯歯車３の側面３ａへの加圧力が調整されることとなっている。
【００２４】
さらに、本実施例においては、前記ケーシング１における反圧力導入溝側の内側面１ｂと対向する内歯歯車３の側面３ｂには、内歯歯車３の回転方向Ｍと反対方向に向かうに従って求心方向に近付く多数のスパイラル溝１３，１３・・が形成されている。該スパイラル溝１３，１３・・は、内歯歯車側面３ｂとケーシング内側面１ｂとの摺動抵抗を低減する摺動抵抗低減手段として作用する。
【００２５】
上記のように構成された内接ギヤポンプは次のように作用する。
【００２６】
外歯歯車４の矢印Ｍ方向への回転に伴って内歯歯車３が回転せしめられ、外歯歯車４と内歯歯車３との間に形成される空間の容積変化により、吸入室６に吸入された流体が吐出室７を経て吐出されるが、この時、圧力導入溝１０，１１，１２に導入された吐出圧力が内歯歯車３の側面３ａに加圧力として作用する。この加圧力の作用により内歯歯車３は、ケーシング１の反圧力導入溝側の内側面１ｂへ押し付けられた状態で回転することとなり、従来生じていたような傾きを起こすことがなくなる。その結果、傾きに起因する内歯歯車３の片当たりが防止され、異常摩耗や焼付きが発生しなくなって信頼性が向上する。
【００２７】
しかも、本実施例の場合、圧力導入溝１０，１１，１２の開口面積Ｓ1，Ｓ2，Ｓ3を、吐出側では大きく、吸入側では小さく（Ｓ1＞Ｓ2＞Ｓ3と）して、内歯歯車３にかかるスラスト方向の荷重が、吐出側で大きく、吸入側で小さくなっていることに対応できるように、圧力導入溝１０，１１，１２から導入される圧力の内歯歯車３の側面３ａへの加圧力を調整できるようにしたため、内歯歯車３における反圧力導入溝側の側面３ｂにかかる押し付け力が均一化され、有害な片当たりが発生せず、さらなる信頼性の向上を図ることができる。
【００２８】
さらに、本実施例の場合、内歯歯車３の反圧力導入溝側側面３ｂに、摺動抵抗低減手段として作用する多数のスパイラル溝１３，１３・・を設けているため、押し付けられた内歯歯車３における反圧力導入溝側の側面３ｂとケーシング１における反圧力導入溝側の内側面１ｂとの間の摺動抵抗が低減されるとともに、潤滑油を含む流体を圧送する場合、スパイラル溝１３，１３・・内への潤滑油の侵入により潤滑性能も良好となり、駆動力の低減に寄与する。
【００２９】
実施例２
図４には、本願発明の実施例２にかかる内接ギヤポンプのケーシング断面が示されている。
【００３０】
本実施例の場合、摺動抵抗低減手段として作用するスパイラル溝１３，１３・・は、ケーシング１における反圧力導入溝側内側面１ｂの内歯歯車３の反圧力導入溝側側面３ｂと対応する部分に形成されている。なお、この場合、スパイラル溝１３，１３・・は、内歯歯車３の回転方向Ｍと同方向に向かうにしたがって求心方向に近付くものとされている。その他の構成および作用効果は実施例１と同様なので重複を避けて説明を省略する。
【００３１】
実施例３
図５には、本願発明の実施例３にかかる内接ギヤポンプの断面図が示されている。
【００３２】
本実施例の場合、内歯歯車３の外周面３ｃと該内歯歯車３の外周面３ｃに対応するケーシング１の内周面１ｃとは、同一方向に同一角度αで傾斜するテーパ面で構成されている。つまり、内歯歯車３の外径は、一側面３ａから他側面１ｂに向かうに従って大径とされているのである。本実施例においても、実施例１あるいは実施例２と同様に、前記内歯歯車３における大径側の側面３ｂとケーシング１における前記内歯歯車３の大径側と対応する内側面１ｂとの摺接面のいずれか一方に、摺動抵抗を低減する摺動抵抗低減手段として作用するスパイラル溝１３，１３・・（図３あるいは図４参照）を形成することが望ましい。なお、本実施例の場合、圧力導入溝は形成されない。その他の構成は実施例１と同様なので重複を避けて説明を省略する。
【００３３】
上記のように構成したことにより、内歯歯車３にかかる半径方向の荷重Ｆがスラスト方向の力Ｆｓとしても配分されるため、内歯歯車３における大径側の側面３ｂをケーシング１の一方の（即ち、大径側の）内側面１ｂへ押し付ける力が得られることとなり、内歯歯車３の傾きが防止される。その他の作用効果は実施例１と同様なので重複を避けて説明を省略する。
【００３４】
本願発明は、上記各実施例の構成に限定されるものではなく、発明の要旨を逸脱しない範囲において適宜設計変更可能なことは勿論である。
【図面の簡単な説明】
【００３５】
【図１】 本願発明の実施例１にかかる内接ギヤポンプの断面図である。
【図２】 図１のＩＩ−ＩＩ断面図である。
【図３】 図１のＩＩＩ−ＩＩＩ断面図である。
【図４】 本願発明の実施例２にかかる内接ギヤポンプにおけるケーシングの断面図である。
【図５】 本願発明の実施例３にかかる内接ギヤポンプの断面図である。
【図６】 従来公知の内接ギヤポンプの断面図である。
【図７】 図６のＶＩＩ−ＶＩＩ断面図である。
【符号の説明】
【００３６】
１はケーシング、１ａ，１ｂは内側面、１ｃは内周面、２はクリアランス、３は内歯歯車、３ａ，３ｂは側面、３ｃは外周面、４は外歯歯車、１０，１１，１２は圧力導入溝、１３は摺動抵抗低減手段（スパイラル溝）。[0001]
[Industrial application fields]
[0002]
The present invention relates to an internal gear pump.
[Prior art]
[0003]
A well-known internal gear pump has been disclosed in Japanese Patent Publication No. 63-54911.
[0004]
As shown in FIGS. 6 and 7, this known internal gear pump includes an internal gear 3 that is rotatably arranged in a casing 1 via an appropriate clearance 2, and the internal gear 3. The external gear 4 meshes in an eccentric state, and a space surrounded by the internal gear 3 and the external gear 4 is divided into a suction chamber 6 and a discharge chamber 7 by a partition plate 5. ing. Reference numeral 8 is a rotating shaft for driving the external gear 4 to rotate, and 9 is a bearing.
[Problems to be solved by the invention]
[0005]
However, in the internal gear pump having the above structure, the load acting on the internal gear 3 is caused by an oil film formed on the clearance 2 a between the outer peripheral surface of the internal gear 3 and the inner peripheral surface of the casing 1. It is supposed to be supported through.
[0006]
In this case, since there is a slight clearance 2b between the internal gear 3 and the inner side surface of the casing 1, there is nothing that directly restrains the internal gear 3, and with respect to the inclination of the internal gear 3. It is in a free state.
[0007]
For this reason, as indicated by a chain line in FIG. 7, a phenomenon may occur in which the internal gear 3 is inclined due to a collapse of the pressure balance in the casing 1 or the like . Then, the outer peripheral edge of the internal gear 3 causes a single contact with the casing inner surface. This partial contact increases the local load, which may cause problems such as abnormal wear and seizure. Eliminating the inclination phenomenon of the internal gear 3 is an important issue in improving the durability of the internal gear pump.
[0008]
The present invention has been made in view of the above points, and an object thereof is to reliably prevent the inclination of the internal gear in the casing by an extremely simple means.
[Means for Solving the Problems]
[0009]
A first basic configuration of the present invention includes an internal gear that is rotatably disposed in a casing with an appropriate clearance, and an external gear that meshes with the internal gear in an eccentric state. In the internal gear pump, a plurality of pressure introduction grooves into which discharge pressure is introduced are formed in a portion corresponding to one side surface of the internal gear on the inner side surface of the casing, and the opening area of the pressure introduction groove is set to a discharge side. Is characterized by being large and small on the inhalation side .
[0010]
A second basic configuration of the present invention includes an internal gear that is rotatably disposed in a casing via an appropriate clearance, and an external gear that meshes with the internal gear in an eccentric state. The internal gear pump is characterized in that the outer peripheral surface of the internal gear and the inner peripheral surface of the casing corresponding to the outer peripheral surface of the internal gear are configured by tapered surfaces inclined at the same angle in the same direction.
[0011]
In the first basic structure of the present invention, in one of the sliding contact surface with the inner surface of the counter-pressure introduction groove side of the side surface and the casing of the counter-pressure introduction groove side in the internal gear, to reduce the sliding resistance rather is preferably of Ru provided a sliding resistance reducing hand stage, in this case, the internal gear in the case where the sliding resistance reducing means are formed on the side surface of the counter-pressure introduction groove side in the internal gear In the case of being formed on the inner surface of the casing on the side opposite to the counter pressure introducing groove, the direction toward the centripetal direction is increased in the same direction as the rotation direction of the internal gear. of not more preferable that the spiral groove.
[0012]
In the second basic configuration of the present invention, either one of a sliding contact surface between the large-diameter side surface of the internal gear and the inner surface of the casing corresponding to the large-diameter side surface of the internal gear has a sliding surface. It is preferable to provide a sliding resistance reducing means for reducing the dynamic resistance. In this case, when the sliding resistance reducing means is formed on the large-diameter side surface of the internal gear, the internal gear In the case of being formed on the inner side surface corresponding to the large-diameter side surface of the internal gear in the casing as it goes in the direction opposite to the rotation direction, in the same direction as the rotation direction of the internal gear It is more preferable to use a large number of spiral grooves toward the centripetal direction.
[Action]
[0013]
In the first basic configuration of the present invention, since the discharge pressure introduced into the pressure introduction groove acts on one side surface of the internal gear, the internal gear is pressed against the inner side surface of the casing on the counter pressure introduction groove side. Inclination of the internal gear is prevented. Moreover, since the opening area of the pressure introducing groove is large on the discharge side and small on the suction side, the load in the thrust direction on the internal gear is large on the discharge side and small on the suction side. Thus, the pressing force applied to the internal gear is made uniform, and no harmful piece contact occurs.
[0014]
In the second basic configuration of the present invention, since the radial load applied to the internal gear is also distributed in the thrust direction, a force for pressing the internal gear against the inner surface of the casing is obtained. Tilt is prevented.
[0015]
In the first basic configuration of the present invention, a slide that reduces sliding resistance is provided on one of the sliding contact surfaces of the internal gear on the side opposite to the reaction pressure introduction groove and the inner surface on the reaction pressure introduction groove side of the casing. case in which the dynamic resistance reducing hand stage, the sliding resistance between the inner surface of the counter-pressure introduction groove side of the lateral surface of the counter-pressure introduction groove side of an internal gear is pressed against the casing is reduced. In this case, when the sliding resistance reducing means is formed on the side surface of the internal gear on the side opposite to the counter pressure introducing groove, the centripetal direction is directed toward the direction opposite to the rotational direction of the internal gear, In the case of being formed on the inner surface of the casing on the side opposite to the pressure introducing groove, when a number of spiral grooves are formed in the centripetal direction toward the same direction as the rotation direction of the internal gear , a fluid containing lubricating oil is pumped The lubrication performance is also improved by the penetration of the lubricating oil into the spiral groove.
[0016]
In the second basic configuration of the present invention, either one of a sliding contact surface between the large-diameter side surface of the internal gear and the inner surface of the casing corresponding to the large-diameter side surface of the internal gear has a sliding surface. When sliding resistance reduction means for reducing dynamic resistance is provided, sliding between the large-diameter side surface of the pressed internal gear and the large-diameter side surface of the internal gear in the casing and the corresponding inner side surface Resistance is reduced. In this case, when the sliding resistance reducing means is formed on the side surface on the large-diameter side of the internal gear, the centripetal direction goes in the direction opposite to the rotation direction of the internal gear, In the case of being formed on the inner side surface corresponding to the large-diameter side surface of the internal gear, a fluid containing lubricating oil is formed with a large number of spiral grooves going in the centripetal direction toward the same direction as the rotation direction of the internal gear. When pressure is fed, the lubricating performance is also improved by the penetration of the lubricating oil into the spiral groove.
【The invention's effect】
[0017]
According to the present invention, the inclination of the internal gear in the casing is reliably prevented by means of extremely simple means (for example, formation of a pressure introduction groove, and the outer peripheral surface of the internal gear and the inner peripheral surface of the casing are tapered). Therefore, there is an excellent effect that the internal gear is prevented from hitting and abnormal wear or seizure does not occur and reliability is improved. Moreover, corresponding to the opening area of the pressure introducing groove, greater in the discharge side, is made smaller in the suction side, the thrust direction load exerted on the internal gear is greater at the discharge side, it is smaller in the suction side In addition, since the pressing force applied to the side surface of the internal gear is made uniform, no harmful piece hitting occurs, and the effect of further improving the reliability can be obtained.
[0018]
Furthermore, the anti-pressure introduction groove side of the internal gear (or larger diameter) reaction pressure introduction groove side of the side surface and the casing (or, corresponding to the large diameter side of the internal gear) sliding surface between the inner surface of either one, case in which the sliding resistance reducing means to reduce the sliding resistance, the anti-pressure introduction groove side of the lateral surface of the counter-pressure introduction groove side of an internal gear is pressed against the casing and the inner surface There is an effect that the sliding resistance is reduced . In this case, when the sliding resistance reducing means is formed on the side surface of the internal gear on the side opposite to the pressure introducing groove (or on the large diameter side), the direction is opposite to the rotational direction of the internal gear. In the case of being formed on the inner surface of the casing on the side opposite to the pressure introduction groove (or corresponding to the large-diameter side surface of the internal gear), the direction of rotation is the same as the rotational direction of the internal gear. Accordingly, when a large number of spiral grooves directed in the centripetal direction are used, when a fluid containing lubricating oil is pumped, the lubricating performance is improved by the penetration of the lubricating oil into the spiral groove, which contributes to a reduction in driving force.
【Example】
[0019]
Hereinafter, some preferred embodiments of the present invention will be described with reference to the accompanying drawings.
[0020]
Example 1
1 to 3 show an internal gear pump according to a first embodiment of the present invention.
[0021]
The main configuration of the internal gear pump of the present embodiment is the same as that described in the section of the prior art, and an internal gear 3 that is rotatably disposed in the casing 1 via an appropriate clearance 2, The external gear 4 is configured to be engaged with the internal gear 3 in an eccentric state. A space surrounded by the internal gear 3 and the external gear 4 is partitioned into a suction chamber 6 and a discharge chamber 7 by a partition plate 5. Reference numeral 8 is a rotating shaft for driving the external gear 4 to rotate, and 9 is a bearing. The suction port and the discharge port are not shown.
[0022]
Therefore, in the case of the present embodiment, a plurality of discharge pressures P are introduced into the portion corresponding to the one side surface 3a of the internal gear 3 on the inner surface 1a of the casing 1 (three in the case of this embodiment). ) Pressure introduction grooves 10, 11, and 12 are formed on the same circumference at regular intervals (in the present embodiment, 120 ° intervals) (see FIG. 2).
[0023]
The pressure introduction grooves 10, 11, and 12 have the same radial width, but the circumferential lengths thereof are the pressure introduction groove 10 on the discharge side, the pressure introduction groove 11 on the intermediate side, and the suction introduction groove 11 on the suction side. The pressure introduction grooves 12 are made smaller in order. That is, the opening areas S 1 , S 2 , S 3 of the pressure introducing grooves 10, 11, 12 are S 1 > S 2 > S 3 . As a result, the pressure applied to the side surface 3a of the internal gear 3 by the pressure introduced from the pressure introduction grooves 10, 11, 12 is adjusted.
[0024]
Further, in this embodiment, the prior SL side 3b of the internal gear 3 that faces the inner surface 1b of contact Keru anti pressure introduction groove side to the casing 1, toward the direction opposite to the rotating direction M of the internal gear 3 Accordingly, a large number of spiral grooves 13, 13... Approaching the centripetal direction are formed. The spiral grooves 13, 13,... Act as sliding resistance reducing means for reducing the sliding resistance between the internal gear side surface 3b and the casing inner side surface 1b.
[0025]
The internal gear pump configured as described above operates as follows.
[0026]
As the external gear 4 rotates in the direction of arrow M, the internal gear 3 is rotated, and the suction chamber 6 is sucked into the suction chamber 6 due to the change in volume of the space formed between the external gear 4 and the internal gear 3. The discharged fluid is discharged through the discharge chamber 7. At this time, the discharge pressure introduced into the pressure introducing grooves 10, 11, 12 acts on the side surface 3 a of the internal gear 3 as an applied pressure. The internal gear 3 by the action of the pressure becomes a rotating while being pressed against the inner surface 1 b of the anti-pressure introduction groove side of the casing 1, there is no to cause inclination as has conventionally occurred. As a result, the contact of the internal gear 3 due to the inclination is prevented, and abnormal wear and seizure do not occur, improving the reliability.
[0027]
Moreover, in this embodiment, the opening areas S 1 , S 2 , S 3 of the pressure introducing grooves 10, 11, 12 are made large on the discharge side and small on the suction side (S 1 > S 2 > S 3 ). Thus, the internal gear of the pressure introduced from the pressure introducing grooves 10, 11, 12 can cope with the fact that the thrust load applied to the internal gear 3 is large on the discharge side and small on the suction side. 3 because of to be able to adjust the pressure applied to the side surface 3a of, such pressing force to the side surface 3 b of the anti-pressure introduction groove side is made uniform in the internal gear 3, it does not occur per harmful piece, additional reliability Can be improved.
[0028]
Further, in the case of the present embodiment, the spiral tooth 13, 13,... Acting as a sliding resistance reducing means is provided on the side surface 3b on the counter pressure introducing groove side of the internal gear 3, so that the pressed internal teeth When the sliding resistance between the side surface 3b on the counter pressure introducing groove side of the gear 3 and the inner side surface 1b on the counter pressure introducing groove side of the casing 1 is reduced, and when fluid containing lubricating oil is pumped, the spiral groove 13 , 13,... Lubricating oil intrudes into the interior to improve lubrication performance and contribute to reduction of driving force.
[0029]
Example 2
FIG. 4 shows a casing cross section of the internal gear pump according to the second embodiment of the present invention.
[0030]
In the present embodiment, the spiral grooves 13, 13... Acting as the sliding resistance reducing means correspond to the counter pressure introducing groove side surface 3 b of the internal gear 3 of the counter pressure introducing groove side inner surface 1 b of the casing 1. It is formed in the part to be. In this case, the spiral grooves 13, 13... Approach the centripetal direction as they go in the same direction as the rotation direction M of the internal gear 3. Other configurations and operational effects are the same as those of the first embodiment, and thus description thereof is omitted to avoid duplication.
[0031]
Example 3
FIG. 5 shows a sectional view of the internal gear pump according to the third embodiment of the present invention.
[0032]
In the case of the present embodiment, the outer peripheral surface 3c of the internal gear 3 and the inner peripheral surface 1c of the casing 1 corresponding to the outer peripheral surface 3c of the internal gear 3 are configured by tapered surfaces that are inclined at the same angle α in the same direction. Has been. That is, the outer diameter of the internal gear 3 is made larger as it goes from the one side surface 3a to the other side surface 1b. Also in the present embodiment, as in the first embodiment or the second embodiment, a side surface 3b on the large diameter side of the internal gear 3 and an inner surface 1b corresponding to the large diameter side of the internal gear 3 in the casing 1 are provided . It is desirable to form spiral grooves 13, 13,... (See FIG. 3 or FIG. 4) that act as sliding resistance reducing means for reducing sliding resistance on either one of the sliding contact surfaces. In this embodiment, no pressure introducing groove is formed. Other configurations are the same as those of the first embodiment, and thus the description is omitted to avoid duplication.
[0033]
With the above configuration, since the radial load F applied to the internal gear 3 is also distributed as the thrust force Fs, the large-diameter side surface 3b of the internal gear 3 is connected to one of the casings 1. A force to be pressed against the inner surface 1b (that is, on the large diameter side) is obtained, and the inclination of the internal gear 3 is prevented. Other functions and effects are the same as those of the first embodiment, and thus the description is omitted to avoid duplication.
[0034]
The invention of the present application is not limited to the configuration of each of the above embodiments, and it is needless to say that the design can be appropriately changed without departing from the gist of the invention.
[Brief description of the drawings]
[0035]
FIG. 1 is a cross-sectional view of an internal gear pump according to a first embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view taken along the line III-III in FIG.
FIG. 4 is a sectional view of a casing in an internal gear pump according to a second embodiment of the present invention.
FIG. 5 is a sectional view of an internal gear pump according to a third embodiment of the present invention.
FIG. 6 is a cross-sectional view of a conventionally known internal gear pump.
7 is a cross-sectional view taken along the line VII-VII in FIG.
[Explanation of symbols]
[0036]
1 is a casing, 1a and 1b are inner surfaces, 1c is an inner peripheral surface, 2 is a clearance, 3 is an internal gear, 3a and 3b are side surfaces, 3c is an outer peripheral surface, 4 is an external gear, 10, 11 and 12 are A pressure introducing groove 13 is a sliding resistance reducing means (spiral groove).

Claims (6)

ケーシング内に適宜のクリアランスを介して回転自在に配設された内歯歯車と、該内歯歯車に対して偏心状態で噛合する外歯歯車とを備えた内接ギヤポンプであって、前記ケーシング内側面における前記内歯歯車の一側面と対応する部分には、吐出圧力が導入される複数の圧力導入溝を形成するとともに、該圧力導入溝の開口面積を、吐出側では大きく、吸入側では小さくしたことを特徴とする内接ギヤポンプ。An internal gear pump comprising an internal gear rotatably disposed in a casing with an appropriate clearance and an external gear meshing with the internal gear in an eccentric state, wherein the internal gear pump A portion of the side surface corresponding to one side surface of the internal gear is formed with a plurality of pressure introduction grooves into which discharge pressure is introduced, and the opening area of the pressure introduction groove is large on the discharge side and small on the suction side. An internal gear pump characterized by that. 前記内歯歯車における反圧力導入溝側の側面とケーシングにおける反圧力導入溝側の内側面との摺接面のいずれか一方には、摺動抵抗を低減する摺動抵抗低減手段を設けたことを特徴とする前記請求項１記載の内接ギヤポンプ。On one of the sliding contact surface with the inner surface of the counter-pressure introduction groove side of the side surface and the casing of the counter-pressure introduction groove side in the internal gear is the provision of the sliding resistance reducing means for reducing the sliding resistance claim 1 Symbol placement of gerotor pump and said. 前記摺動抵抗低減手段は、前記内歯歯車における反圧力導入溝側の側面に形成される場合においては該内歯歯車の回転方向と反対方向に向かうに従って求心方向に向かい、前記ケーシングにおける反圧力導入溝側の内側面に形成される場合においては前記内歯歯車の回転方向と同方向に向かうに従って求心方向に向かう多数のスパイラル溝とされていることを特徴とする前記請求項２記載の内接ギヤポンプ。In the case where the sliding resistance reducing means is formed on the side surface of the internal gear on the reaction pressure introduction groove side , the sliding resistance reduction means proceeds in the centripetal direction toward the direction opposite to the rotation direction of the internal gear, and the reaction pressure in the casing. 3. The inner surface according to claim 2 , wherein when formed on the inner surface on the introduction groove side , a plurality of spiral grooves are formed in a centripetal direction toward the same direction as the rotation direction of the internal gear . Contact gear pump. ケーシング内に適宜のクリアランスを介して回転自在に配設された内歯歯車と、該内歯歯車に対して偏心状態で噛合する外歯歯車とを備えた内接ギヤポンプであって、前記内歯歯車の外周面と該内歯歯車の外周面に対応するケーシングの内周面とを、同一方向に同一角度で傾斜するテーパ面で構成したことを特徴とする内接ギヤポンプ。  An internal gear pump comprising an internal gear rotatably disposed in a casing with an appropriate clearance and an external gear meshing with the internal gear in an eccentric state, wherein the internal gear An internal gear pump characterized in that an outer peripheral surface of a gear and an inner peripheral surface of a casing corresponding to the outer peripheral surface of the internal gear are formed by tapered surfaces inclined at the same angle in the same direction. 前記内歯歯車における大径側の側面とケーシングにおける前記内歯歯車の大径側側面に対応する内側面との摺接面のいずれか一方には、摺動抵抗を低減する摺動抵抗低減手段を設けたことを特徴とする前記請求項４記載の内接ギヤポンプ。Sliding resistance reducing means for reducing sliding resistance is provided on any one of the sliding surfaces of the large-diameter side surface of the internal gear and the inner surface of the casing corresponding to the large-diameter side surface of the internal gear. The internal gear pump according to claim 4, wherein the internal gear pump is provided. 前記摺動抵抗低減手段は、前記内歯歯車における大径側の側面に形成される場合においては該内歯歯車の回転方向と反対方向に向かうに従って求心方向に向かい、前記ケーシングにおける前記内歯歯車の大径側側面に対応する内側面に形成される場合においては前記内歯歯車の回転方向と同方向に向かうに従って求心方向に向かう多数のスパイラル溝とされていることを特徴とする前記請求項５記載の内接ギヤポンプ。When the sliding resistance reducing means is formed on the side surface on the large-diameter side of the internal gear, the sliding resistance decreases in the centripetal direction toward the direction opposite to the rotation direction of the internal gear, and the internal gear in the casing In the case of being formed on the inner side surface corresponding to the large-diameter side surface, a plurality of spiral grooves are formed in the centripetal direction toward the same direction as the rotation direction of the internal gear. 5. An internal gear pump according to 5.
JP09025294A 1994-04-27 1994-04-27 Inscribed gear pump Expired - Fee Related JP3668781B2 (en)

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JP3668781B2 true JP3668781B2 (en) 2005-07-06

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JP6311644B2 (en) * 2015-04-28 2018-04-18 株式会社Ｓｏｋｅｎ Gear pump device
CN114320880A (en) * 2021-11-10 2022-04-12 浙江环誉泵业科技有限公司 Gear end face communication backflow groove with self-lubricating and self-cooling functions

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