JP2022088918A - External gear pump - Google Patents

External gear pump Download PDF

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JP2022088918A
JP2022088918A JP2020201056A JP2020201056A JP2022088918A JP 2022088918 A JP2022088918 A JP 2022088918A JP 2020201056 A JP2020201056 A JP 2020201056A JP 2020201056 A JP2020201056 A JP 2020201056A JP 2022088918 A JP2022088918 A JP 2022088918A
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side gear
gear
driven
drive
seal body
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JP7446210B2 (en
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幹訓 打上
Mikikuni Uchigami
淳之 荒井
Atsushi Arai
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Kubota Corp
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Kubota Corp
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Abstract

To form an external gear pump which inhibits leakage of a fluid satisfactorily.SOLUTION: An external gear pump includes: a driving side gear 2 which is rotated by a driving shaft 1; a driven side gear 4 which is supported by a driven shaft 3 and engages with the driving side gear; a pump case which houses the driving side gear 2 and the driven side gear 4; and a seal unit S which prevents leakage of a fluid from side surfaces of the driving side gear 2 and the driven side gear 4. The seal unit S includes: a seal body 10 which is disposed with its inner surface contacting with the side surfaces of the driving side gear 2 and the driven side gear 4; and a biasing member 11 which exerts a biasing force for placing the inner surface of the seal body 10 in contact with the side surfaces of the driving side gear 2 and the driven side gear 4.SELECTED DRAWING: Figure 3

Description

本発明は、外接型ギヤポンプに関する。 The present invention relates to a circumscribed gear pump.

外接型ギヤポンプは、駆動側ギヤと従動側ギヤとを咬合させ、駆動側ギヤと従動側ギヤとが回転する際に一方から流体を吸引し、他方に流体を吐出するものであり、駆動側ギヤと従動側ギヤとの側面にシール部材を備えるものが、以下に説明する特許文献１に示されている。 The external gear pump engages the drive side gear and the driven side gear, and when the drive side gear and the driven side gear rotate, the fluid is sucked from one side and discharged to the other side. A seal member provided on the side surface of the driven side gear and the driven side gear is shown in Patent Document 1 described below.

つまり、特許文献１には、ケースの内部に駆動側ギヤと従動側ギヤとを収容し、これらのギヤの側面に仕切板とシール部材とを配置し、これらの外方に配置される蓋部でケースの端部を閉塞した構成が記載されている。 That is, in Patent Document 1, a drive side gear and a driven side gear are housed inside the case, a partition plate and a seal member are arranged on the side surface of these gears, and a lid portion arranged outside these gears. The configuration in which the end of the case is closed is described in.

この特許文献１では、駆動側ギヤと従動側ギヤとが駆動回転した際の吐出側の流体の一部をシール部材のループ内に流し、この流体の圧力を仕切板に作用させることにより仕切板を駆動側ギヤの側面と従動側ギヤの側面とに押圧させるように構成されている。 In Patent Document 1, a part of the fluid on the discharge side when the drive side gear and the driven side gear are driven and rotated flows into the loop of the seal member, and the pressure of this fluid is applied to the partition plate to act on the partition plate. Is configured to be pressed against the side surface of the drive side gear and the side surface of the driven side gear.

特開平１０－２８１０８１号公報Japanese Unexamined Patent Publication No. 10-281801

しかしながら、特許文献１に記載されるように流体の圧力によりシール性能を高めるものでは、ギヤが低速で回転し、流体量が少ない場合などには、流体の圧力だけでは十分なシール性能が得られないことも考えられた。 However, in the case where the sealing performance is enhanced by the pressure of the fluid as described in Patent Document 1, when the gear rotates at a low speed and the amount of the fluid is small, sufficient sealing performance can be obtained only by the pressure of the fluid. It was also considered that there was no such thing.

特に、大型の作業車では、大型のアクチュエータを駆動するため、大容量のポンプを必要とするものの、例えば、シール性能が低いポンプでは、流体の漏出量を考慮するとポンプの大型化が避けられないものであった。 In particular, a large work vehicle requires a large-capacity pump to drive a large actuator, but for example, a pump with low sealing performance cannot avoid increasing the size of the pump in consideration of the amount of fluid leakage. It was a thing.

このような理由から、流体の漏出を良好に抑制する外接型ギヤポンプが望まれている。 For this reason, an circumscribed gear pump that satisfactorily suppresses fluid leakage is desired.

本発明に係る外接型ギヤポンプの特徴構成は、駆動軸の駆動力によって回転する駆動側ギヤと、従動軸に支持され前記駆動側ギヤに咬合することにより前記駆動側ギヤの駆動力により回転する従動側ギヤと、前記駆動側ギヤと前記従動側ギヤとを収容するポンプケースと、前記駆動側ギヤと前記従動側ギヤとの側面からの流体の漏出を防止するシールユニットとを備えると共に、前記シールユニットが、前記駆動軸が挿通する駆動軸孔と、前記従動軸が挿通する従動軸孔とを有し、内面を前記駆動側ギヤと前記従動側ギヤとの側面に接触して配置されるシール体、及び、前記シール体の前記内面を、前記駆動側ギヤと前記従動側ギヤとの側面に接触させる付勢力を作用させる付勢部材を備えている点にある。 The characteristic configuration of the external gear pump according to the present invention is a driven side gear that is rotated by the driving force of the driving shaft and a driven side that is supported by the driven shaft and is rotated by the driving force of the driving side gear by engaging with the driving side gear. It is provided with a side gear, a pump case for accommodating the drive side gear and the driven side gear, and a seal unit for preventing fluid from leaking from the side surfaces of the drive side gear and the driven side gear, and the seal. A seal in which the unit has a drive shaft hole through which the drive shaft is inserted and a driven shaft hole through which the driven shaft is inserted, and an inner surface thereof is arranged so as to be in contact with the side surface of the drive side gear and the driven side gear. The point is that the body and the inner surface of the seal body are provided with an urging member that exerts an urging force that brings the inner surface of the seal body into contact with the side surfaces of the drive side gear and the driven side gear.

この特徴構成によると、駆動側ギヤと従動側ギヤとの側面に接触するシール体が、接触方向に付勢部材で付勢されるため、駆動側ギヤと従動側ギヤとの吐出圧に拘わらず接触状態を維持し、駆動ギヤと従動側ギヤとの側面からの流体の漏出を抑制できる。
従って、流体の漏出を良好に抑制する外接型ギヤポンプが構成された。 According to this characteristic configuration, the seal body that contacts the side surfaces of the drive side gear and the driven side gear is urged by the urging member in the contact direction, so that regardless of the discharge pressure between the drive side gear and the driven side gear, It is possible to maintain the contact state and suppress the leakage of fluid from the side surfaces of the drive gear and the driven gear.
Therefore, an circumscribed gear pump that satisfactorily suppresses fluid leakage has been constructed.

上記構成に加えた構成として、前記付勢部材が、前記シール体の前記内面の反対側となる外面に配置され、前記駆動側ギヤと前記従動側ギヤとの軸芯に沿う方向視において、前記駆動軸と前記従動軸との中間位置に付勢力を作用させても良い。 As a configuration added to the above configuration, the urging member is arranged on an outer surface opposite to the inner surface of the seal body, and in a directional view along the axis of the drive side gear and the driven side gear, the said An urging force may be applied to an intermediate position between the drive shaft and the driven shaft.

これによると、単一の付勢部材を用いるものでありながら、駆動側ギヤの側面と従動側ギヤの側面とに対してシール体を均一の圧力で圧接させることが可能となり、構造の簡素化を実現する。 According to this, although a single urging member is used, the seal body can be pressed against the side surface of the drive side gear and the side surface of the driven side gear with a uniform pressure, and the structure is simplified. To realize.

上記構成に加えた構成として、前記シール体が、前記駆動側ギヤと前記従動側ギヤとの側面のうち吐出側からの流体の圧力を、前記シール体の前記内面の反対側となる外面に伝える圧力導入路を有しても良い。 As a configuration added to the above configuration, the seal body transmits the pressure of the fluid from the discharge side of the side surfaces of the drive side gear and the driven side gear to the outer surface opposite to the inner surface of the seal body. It may have a pressure introduction path.

これによると、シール体の外面に吐出側からの流体の圧力と、付勢部材の圧力とを同時に作用させることが可能となり、一層良好なシール状態を作り出せる。 According to this, the pressure of the fluid from the discharge side and the pressure of the urging member can be simultaneously applied to the outer surface of the seal body, and a better sealing state can be created.

第１駆動軸と第２駆動軸とを示す外接型ギヤポンプの断面図である。It is sectional drawing of the external type gear pump which shows the 1st drive shaft and the 2nd drive shaft. 第１駆動軸を示す外接型ギヤポンプの断面図である。It is sectional drawing of the external type gear pump which shows the 1st drive shaft. 駆動側ギヤと従動側ギヤとシール体とを示す斜視図である。It is a perspective view which shows the drive side gear, the driven side gear, and a seal body.

以下、本発明の実施形態を図面に基づいて説明する。
〔基本構成〕
図１～図３に示すように、駆動軸１の駆動力で回転する駆動側ギヤ２と、駆動軸１と平行する姿勢の従動軸３に支持され駆動側ギヤ２と咬合することにより、駆動側ギヤ２の回転に伴って回転する従動側ギヤ４と、これらのギヤを収容するポンプケース５とを備えて外接型ギヤポンプＰが構成されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIGS. 1 to 3, the drive side gear 2 rotated by the drive force of the drive shaft 1 and the driven shaft 3 supported by the driven shaft 3 in a posture parallel to the drive shaft 1 are driven by engaging with the drive side gear 2. An external gear pump P is configured to include a driven side gear 4 that rotates with the rotation of the side gear 2 and a pump case 5 that accommodates these gears.

この外接型ギヤポンプＰは、トラクタやバックホー等の作業車において油圧アクチュエータに供給する作動油（流体の一例）を供給するものを示している。 The circumscribed gear pump P indicates a pump that supplies hydraulic oil (an example of a fluid) to be supplied to a hydraulic actuator in a work vehicle such as a tractor or a backhoe.

特に、この外接型ギヤポンプＰは、図１、図２に示す第１駆動側ギヤ２ａと第１従動側ギヤ４ａとで構成される第１ギヤユニットＧ１と、第２駆動側ギヤ２ｂと第２従動側ギヤ４ｂとで構成される第２ギヤユニットＧ２とを備えており、第２ギヤユニットの容量より、第１ギヤユニットの容量を大きくしている。 In particular, the external gear pump P includes a first gear unit G1 composed of a first drive side gear 2a and a first driven side gear 4a shown in FIGS. 1 and 2, a second drive side gear 2b, and a second. A second gear unit G2 composed of a driven side gear 4b is provided, and the capacity of the first gear unit is larger than the capacity of the second gear unit.

図２に示すように、ポンプケース５は、単一の吸入ポート５ＩＮが形成されると共に、第１ギヤユニットＧ１に対応する第１吐出ポート５Ｐ１と、第２ギヤユニットＧ２に対応する第２吐出ポート５Ｐ２とが形成されている。 As shown in FIG. 2, in the pump case 5, a single suction port 5IN is formed, and a first discharge port 5P1 corresponding to the first gear unit G1 and a second discharge corresponding to the second gear unit G2 are formed. A port 5P2 is formed.

〔第１ギヤユニットと第２ギヤユニット〕
図１に示すように、この外接型ギヤポンプＰは、駆動軸１が、外部の駆動源からの駆動力が伝えられる入力部１Ｄを有する第１駆動軸１ａと、この第１駆動軸１ａと同軸芯で配置され第１駆動軸１ａと一体的に回転する第２駆動軸１ｂとで構成されている。また、従動軸３は、第１駆動軸１ａに隣接する第１従動軸３ａと、この第１従動軸３ａと同軸芯で配置され第２駆動軸１ｂに隣接する第２従動軸３ｂとで構成されている。尚、第１駆動軸１ａの端部の入力部１Ｄは、ポンプケース５の外部に突出させている。 [1st gear unit and 2nd gear unit]
As shown in FIG. 1, in the external gear pump P, the drive shaft 1 is coaxial with the first drive shaft 1a having an input unit 1D to which a drive force from an external drive source is transmitted and the first drive shaft 1a. It is composed of a second drive shaft 1b which is arranged by a core and rotates integrally with the first drive shaft 1a. Further, the driven shaft 3 is composed of a first driven shaft 3a adjacent to the first driven shaft 1a and a second driven shaft 3b arranged coaxially with the first driven shaft 3a and adjacent to the second driven shaft 1b. Has been done. The input portion 1D at the end of the first drive shaft 1a is projected to the outside of the pump case 5.

駆動側ギヤ２は、第１駆動軸１ａと一体的に回転する第１駆動側ギヤ２ａと、第２駆動軸１ｂと一体的に回転する第２駆動側ギヤ２ｂとで構成されている。従動側ギヤ４は、第１駆動側ギヤ２ａに咬合する状態で第１従動軸３ａと一体回転する第１従動側ギヤ４ａと、第２駆動側ギヤ２ｂに咬合する状態で第２従動軸３ｂと一体回転する第２従動側ギヤ４ｂとで構成されている。 The drive-side gear 2 includes a first drive-side gear 2a that rotates integrally with the first drive shaft 1a, and a second drive-side gear 2b that rotates integrally with the second drive shaft 1b. The driven side gear 4 has a first driven side gear 4a that rotates integrally with the first driven shaft 3a in a state of engaging with the first drive side gear 2a and a second driven shaft 3b in a state of engaging with the second drive side gear 2b. It is composed of a second driven side gear 4b that rotates integrally with the gear 4b.

図１、図２に示すように、ポンプケース５は、フランジ部５ｆが一体形成された第１端部ケース５ａと、この第１端部ケース５ａの反対側に配置される第２端部ケース５ｂと、これらの間に挟み込まれる中間ケース５ｃとで構成されている。 As shown in FIGS. 1 and 2, the pump case 5 has a first end case 5a in which a flange portion 5f is integrally formed and a second end case arranged on the opposite side of the first end case 5a. It is composed of 5b and an intermediate case 5c sandwiched between them.

〔シールユニット〕
図１～図３に示すように、シールユニットＳは、シール体１０とスプリング１１（付勢部材の一例）とで構成されている。 [Seal unit]
As shown in FIGS. 1 to 3, the seal unit S is composed of a seal body 10 and a spring 11 (an example of an urging member).

つまり、外接型ギヤポンプＰは、駆動側ギヤ２（第１駆動側ギヤ２ａ、第２駆動側ギヤ２ｂ）と、従動側ギヤ４（第１従動側ギヤ４ａ、第２従動側ギヤ４ｂ）との側面に接触して配置されることで駆動側ギヤ２と従動側ギヤ４との側面からの作動油（流体）の漏出を防止するため４箇所にシール体１０を備え、このシール体１０をギヤの側面に接触させる付勢力を作用させる圧縮コイル型のスプリング１１を備えている。 That is, the external gear pump P includes the drive side gear 2 (first drive side gear 2a, second drive side gear 2b) and the driven side gear 4 (first driven side gear 4a, second driven side gear 4b). Seal bodies 10 are provided at four locations in order to prevent leakage of hydraulic oil (fluid) from the side surfaces of the drive side gear 2 and the driven side gear 4 by being arranged in contact with the side surfaces, and the seal bodies 10 are geared. It is provided with a compression coil type spring 11 that exerts an urging force in contact with the side surface of the gear.

シール体１０は、焼結金属で形成され、その外周部位がポンプケース５の内周に密接する形状に成形されている。また、図１に示すように、ポンプケース５は、シール体１０がギヤの側面から離間する方向への移動の限界を決める規制部５ｒが形成されている。 The seal body 10 is made of sintered metal, and the outer peripheral portion thereof is formed into a shape in close contact with the inner circumference of the pump case 5. Further, as shown in FIG. 1, the pump case 5 is formed with a regulating portion 5r that determines a limit of movement of the seal body 10 in a direction away from the side surface of the gear.

図３に示すように、シール体１０は、駆動軸１（第１駆動軸１ａと第２駆動軸１ｂとの何れか）が挿通する駆動軸孔１０ａと、従動軸３（第１従動軸３ａと第２従動軸３ｂとの何れか）が挿通する従動軸孔１０ｂとが形成されている。 As shown in FIG. 3, the seal body 10 has a drive shaft hole 10a through which the drive shaft 1 (either the first drive shaft 1a or the second drive shaft 1b) is inserted, and the driven shaft 3 (first driven shaft 3a). And a driven shaft hole 10b through which any of the second driven shaft 3b) is inserted.

このシール体１０は、ギヤの側面に対応する内面が平坦に成形され、この内面と反対側となる外面に吐出側からの作動油が供給される圧力導入溝１０ｃが形成されている。つまり、圧力導入溝１０ｃは、吐出側に隣接する導入端１０ｄからの作動油を、分流し駆動軸孔１０ａを取り囲む領域と、従動軸孔１０ｂを取り囲む領域とに供給する領域に形成されている。 The inner surface of the seal body 10 corresponding to the side surface of the gear is formed flat, and a pressure introduction groove 10c for supplying hydraulic oil from the discharge side is formed on the outer surface opposite to the inner surface. That is, the pressure introduction groove 10c is formed in a region for supplying hydraulic oil from the introduction end 10d adjacent to the discharge side to a region surrounding the shunt drive shaft hole 10a and a region surrounding the driven shaft hole 10b. ..

尚、シール体１０の外面側に形成される圧力導入溝１０ｃは吐出側の作動油を吸入側に流す流路として形成されているが、必ずしも吸入側に流すように形成する必要はなく、導入端１０ｄから供給された作動油の圧力を受けることが可能な凹状に形成するものであっても良い。また、シール体１０の内面は、平坦に形成するものに限らず、例えば、潤滑のために作動油の一部を流す溝を形成するように構成することも可能である。 The pressure introduction groove 10c formed on the outer surface side of the seal body 10 is formed as a flow path for flowing the hydraulic oil on the discharge side to the suction side, but it is not always necessary to form the pressure introduction groove 10c so as to flow to the suction side. It may be formed in a concave shape capable of receiving the pressure of the hydraulic oil supplied from the end 10d. Further, the inner surface of the seal body 10 is not limited to the one formed flat, and for example, it can be configured to form a groove through which a part of the hydraulic oil flows for lubrication.

スプリング１１は、シール体１０の外面で、駆動軸１と従動軸３との軸芯に沿う方向視で駆動軸１と従動軸３との中間位置に付勢力を作用させている。より具体的には、本実施形態では、駆動軸１の軸芯と従動軸３との軸芯とを結ぶ直線上にスプリング１１の中心軸を配置している。４つのシール体１０のうち図１に示すように両端（同図で左右の端部）に配置されるものについては、夫々のシール体１０のスプリング１１の外面とポンプケース５の内面との間にスプリング１１が配置され、４つのシール体１０のうち、内側に配置される２つのものについては、夫々のシール体１０の外面の間に１つのスプリング１１が配置されている。 The spring 11 exerts an urging force on the outer surface of the seal body 10 at an intermediate position between the drive shaft 1 and the driven shaft 3 in a directional view along the axis of the drive shaft 1 and the driven shaft 3. More specifically, in the present embodiment, the central axis of the spring 11 is arranged on a straight line connecting the axis of the drive shaft 1 and the axis of the driven shaft 3. Of the four seal bodies 10, those arranged at both ends (left and right ends in the figure) as shown in FIG. 1 are between the outer surface of the spring 11 of each seal body 10 and the inner surface of the pump case 5. A spring 11 is arranged in the seal body 10, and one spring 11 is arranged between the outer surfaces of the respective seal bodies 10 for two of the four seal bodies 10 arranged inside.

このような構成から、駆動側ギヤ２と従動側ギヤ４との側面に接触するシール体１０が、スプリング１１（付勢部材）の付勢力によって駆動側ギヤ２と従動側ギヤ４との側面に押圧されるため、駆動側ギヤ２と従動側ギヤ４との吐出圧に拘わらず、シール体１０を適切な接触状態に維持し、作動油の漏出を抑制できる。その結果として、外接型ギヤポンプＰの大型化を招くことなく、必要とする作動油の供給を可能にしている。 From such a configuration, the seal body 10 that comes into contact with the side surfaces of the drive side gear 2 and the driven side gear 4 is placed on the side surface of the drive side gear 2 and the driven side gear 4 by the urging force of the spring 11 (the urging member). Since it is pressed, the seal body 10 can be maintained in an appropriate contact state and leakage of hydraulic oil can be suppressed regardless of the discharge pressure between the drive side gear 2 and the driven side gear 4. As a result, it is possible to supply the required hydraulic oil without causing the circumscribed gear pump P to become large.

〔別実施形態〕
本発明は、上記した実施形態以外に以下のように構成しても良い（実施形態と同じ機能を有するものには、実施形態と共通の番号、符号を付している）。 [Another Embodiment]
The present invention may be configured as follows in addition to the above-described embodiments (those having the same functions as those of the embodiments are designated by the same numbers and reference numerals as those of the embodiments).

（ａ）付勢部材として圧縮コイル型のスプリング１１に代えて板状のスプリングを用いる。また、付勢部材は、１つのシール体１０に対して１だけ備える構成に限るものではなく、例えば、２以上の数を備えても良い。 (A) A plate-shaped spring is used as the urging member instead of the compression coil type spring 11. Further, the urging member is not limited to the configuration in which only one is provided for one seal body 10, and for example, two or more may be provided.

（ｂ）上述した実施形態では、シール体１０に圧力導入溝１０ｃを形成していたが、シール体１０は、必ずしも圧力導入溝１０ｃを必要とするものでない。また、シール体１０は焼結金属で形成されたものに限るものではなく、樹脂や金属材で形成されるものでも良い。 (B) In the above-described embodiment, the pressure introduction groove 10c is formed in the seal body 10, but the seal body 10 does not necessarily require the pressure introduction groove 10c. Further, the sealing body 10 is not limited to the one formed of sintered metal, but may be formed of a resin or a metal material.

（ｃ）上述した実施形態では、外接型ギヤポンプＰは、単一の駆動軸１に２つの駆動側ギヤ２を備え、単一の従動軸１に２つの従動側ギヤ４を備えた構成について説明したが、これに限るものではない。例えば、駆動軸１に備えられる駆動側ギヤ２の数は１つであってもよく、３つ以上であってもよい。同様に、従動軸２に備えられる従動側ギヤ４の数は１つであってもよく、３つ以上であってもよい。また、駆動軸２及び従動軸４を２本以上備えていてもよい。 (C) In the above-described embodiment, the external gear pump P includes two drive side gears 2 on a single drive shaft 1 and two driven side gears 4 on a single driven shaft 1. However, it is not limited to this. For example, the number of drive side gears 2 provided on the drive shaft 1 may be one or three or more. Similarly, the number of the driven side gears 4 provided in the driven shaft 2 may be one or three or more. Further, two or more drive shafts 2 and driven shafts 4 may be provided.

（ｄ）上述した実施形態では、駆動側ギヤ２及び従動側ギヤ４の一方の側面に当接するシール体１０と他方の側面に当接するシール体１０の両方をスプリング１１で付勢しているが、これに限らず、一方の側面に当接するシール体１０のみをスプリング１１で付勢する構成としてもよい。例えば、４つのシール体１０のうち両端（図１で左右の端部）に配置されるものをスプリング１１で付勢し、４つのシール体１０のうち内側に配置される２つについてはスプリング１１を配置しない構成としてもよい。あるいは、４つのシール体１０のうち両端（図１で左右の端部）に配置される２つについてはスプリング１１で付勢せず、４つのシール体１０のうち内側に配置される２つをスプリング１１で付勢するようにしてもよい。 (D) In the above-described embodiment, both the seal body 10 that abuts on one side surface of the drive side gear 2 and the driven side gear 4 and the seal body 10 that abuts on the other side surface are urged by the spring 11. However, the present invention may be limited to the configuration in which only the seal body 10 that abuts on one side surface is urged by the spring 11. For example, of the four seal bodies 10, those arranged at both ends (left and right ends in FIG. 1) are urged by the spring 11, and two of the four seal bodies 10 arranged inside are springs 11. It may be configured not to arrange. Alternatively, two of the four seal bodies 10 arranged at both ends (left and right ends in FIG. 1) are not urged by the spring 11, and two of the four seal bodies 10 arranged inside are used. It may be urged by the spring 11.

本発明は、外接型ギヤポンプに利用することができる。 The present invention can be used for a circumscribed gear pump.

１ 駆動軸
２ 駆動側ギヤ
３ 従動軸
４ 従動側ギヤ
５ ポンプケース
１０ シール体
１０ａ 駆動軸孔
１０ｂ 従動軸孔
１０ｃ 圧力導入溝
１１ スプリング（付勢部材）
Ｓ シールユニット
1 Drive shaft 2 Drive side gear 3 Driven shaft 4 Driven side gear 5 Pump case 10 Seal body 10a Drive shaft hole 10b Driven shaft hole 10c Pressure introduction groove 11 Spring (urgency member)
S seal unit

Claims (3)

駆動軸の駆動力によって回転する駆動側ギヤと、
従動軸に支持され前記駆動側ギヤに咬合することにより前記駆動側ギヤの駆動力により回転する従動側ギヤと、
前記駆動側ギヤと前記従動側ギヤとを収容するポンプケースと、
前記駆動側ギヤと前記従動側ギヤとの側面からの流体の漏出を防止するシールユニットとを備えると共に、
前記シールユニットが、前記駆動軸が挿通する駆動軸孔と、前記従動軸が挿通する従動軸孔とを有し、内面を前記駆動側ギヤと前記従動側ギヤとの側面に接触して配置されるシール体、及び、前記シール体の前記内面を、前記駆動側ギヤと前記従動側ギヤとの側面に接触させる付勢力を作用させる付勢部材を備えている外接型ギヤポンプ。 The drive side gear that is rotated by the drive force of the drive shaft,
A driven side gear that is supported by a driven shaft and is rotated by the driving force of the drive side gear by engaging with the drive side gear.
A pump case accommodating the drive side gear and the driven side gear,
A seal unit for preventing fluid leakage from the side surfaces of the drive side gear and the driven side gear is provided, and the seal unit is provided.
The seal unit has a drive shaft hole through which the drive shaft is inserted and a driven shaft hole through which the driven shaft is inserted, and the inner surface is arranged in contact with the side surfaces of the drive side gear and the driven side gear. An external gear pump comprising a seal body and an urging member that exerts an urging force to bring the inner surface of the seal body into contact with the side surfaces of the drive side gear and the driven side gear. 前記付勢部材が、前記シール体の前記内面の反対側となる外面に配置され、前記駆動側ギヤと前記従動側ギヤとの軸芯に沿う方向視において、前記駆動軸と前記従動軸との中間位置に付勢力を作用させる請求項１に記載の外接型ギヤポンプ。 The urging member is arranged on an outer surface opposite to the inner surface of the seal body, and the drive shaft and the driven shaft are arranged in a directional view along the axis of the drive side gear and the driven side gear. The external gear pump according to claim 1, wherein an urging force is applied to an intermediate position. 前記シール体が、前記駆動側ギヤと前記従動側ギヤとの側面のうち吐出側からの流体の圧力を、前記シール体の前記内面の反対側となる外面に伝える圧力導入路を有している請求項２に記載の外接型ギヤポンプ。 The seal body has a pressure introduction path that transmits the pressure of the fluid from the discharge side of the side surfaces of the drive side gear and the driven side gear to the outer surface opposite to the inner surface of the seal body. The external gear pump according to claim 2.
JP2020201056A 2020-12-03 2020-12-03 external gear pump Active JP7446210B2 (en)

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