JP2014218964A - Internal gear pump - Google Patents

Internal gear pump Download PDF

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JP2014218964A
JP2014218964A JP2013099901A JP2013099901A JP2014218964A JP 2014218964 A JP2014218964 A JP 2014218964A JP 2013099901 A JP2013099901 A JP 2013099901A JP 2013099901 A JP2013099901 A JP 2013099901A JP 2014218964 A JP2014218964 A JP 2014218964A
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tooth
internal
teeth
curve
internal gear
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JP6220548B2 (en
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宣尚 渡邊
Nobuhisa Watanabe
宣尚 渡邊
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Toyooki Kogyo Co Ltd
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Toyooki Kogyo Co Ltd
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    • 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

Abstract

PROBLEM TO BE SOLVED: To provide an internal gear pump which increases setting flexibility of eccentricity between an external tooth gear and an internal tooth gear and can further increase discharge amount.SOLUTION: An internal gear pump stores a ring-shaped internal tooth gear 1 having internal teeth 1A and an external tooth gear having external teeth 3A which performs inscribed engagement with the internal teeth 1A of the internal tooth gear 1 eccentrically on an inner part of the internal tooth gear 1. Therein, the number of teeth of the internal teeth 1A is more than that of the external teeth 3A by one sheet. In the internal teeth 1A, a tooth tip part 7A, a meshing part 7C and a tooth bottom part 7B are formed with curves independent to one another. In the meshing part 7C, connection portions with the tooth tip part 7A and the tooth bottom part 7B are respectively formed with curves 7H, 7I which have the same tangent as the curve of oneself and have curvatures larger than that of oneself.

Description

本発明は、内歯歯車の内歯と外歯歯車の外歯とを内接噛み合いするよう内歯歯車の内部に外歯歯車を偏心して収容し、内歯の歯数が外歯の歯数より１個多い内接歯車ポンプに関する。   In the present invention, the external gear is eccentrically accommodated inside the internal gear so that the internal teeth of the internal gear and the external teeth of the external gear are in meshed with each other, and the number of teeth of the internal teeth is the number of teeth of the external teeth. More than one internal gear pump.

この種の内接歯車ポンプは、ポンプハウジングの収容孔に、内歯を有するリング状の内歯歯車を回転自在に収容し、この内歯歯車の内歯と内接噛み合いする外歯を有する外歯歯車を内歯歯車の内部に偏心して収容し、外歯歯車の回転駆動により内歯が外歯と噛み合う内歯歯車が回転され、液体を吸入ポートから吸入して吐出ポートから吐出する。そして、外歯歯車の外歯は、歯底部と歯先部との間の噛合部をインボリュート曲線で形成し、インボリュート曲線は、外歯歯車と内歯歯車との偏心量との関連がなく、偏心量の設定に自由度が生じ、偏心量を大きくして大吐出量を可能にしている。   In this type of internal gear pump, a ring-shaped internal gear having internal teeth is rotatably accommodated in an accommodation hole of the pump housing, and an external tooth having external teeth that mesh with the internal teeth of the internal gear. The tooth gear is eccentrically housed inside the internal gear, and the internal gear meshing with the external teeth is rotated by the rotational drive of the external gear, and the liquid is sucked from the suction port and discharged from the discharge port. And, the external teeth of the external gear form an involute curve at the meshing part between the root part and the tooth tip part, and the involute curve is not related to the eccentric amount of the external gear and the internal gear, There is a degree of freedom in setting the eccentric amount, and the eccentric amount is increased to enable a large discharge amount.

特開２００５−３６７３５号公報JP 2005-36735 A

ところが、かかる従来の内接歯車ポンプでは、外歯の噛合部を形成するインボリュート曲線を、歯底部を形成するハイポサイクロイド曲線および歯先部を形成するエピサイクロイド曲線とそれぞれ直接接続しているため、歯底部を形成するハイポサイクロイド曲線および歯先部を形成するエピサイクロイド曲線が偏心量と関連し、偏心量の設定の自由度が十分ではなく、十分な大吐出量を得られなかった。   However, in such a conventional internal gear pump, the involute curve that forms the meshing part of the external teeth is directly connected to the hypocycloid curve that forms the tooth bottom part and the epicycloid curve that forms the tooth tip part, respectively. The hypocycloid curve that forms the tooth bottom part and the epicycloid curve that forms the tooth tip part are related to the amount of eccentricity, and the degree of freedom in setting the amount of eccentricity is not sufficient, and a sufficient large discharge amount cannot be obtained.

本発明の課題は、外歯歯車と内歯歯車との偏心量の設定の自由度を増し、吐出量をより一層増加可能とし得る内接歯車ポンプを提供するものである。   An object of the present invention is to provide an internal gear pump that can increase the degree of freedom in setting the eccentric amount of the external gear and the internal gear and can further increase the discharge amount.

かかる課題を達成すべく、本発明は次の手段をとった。即ち、
内歯を有するリング状の内歯歯車と、内歯歯車の内歯と内接噛み合いする外歯を有する外歯歯車を内歯歯車の内部に偏心して収容し、外歯よりも内歯の歯数が１枚多い内接歯車ポンプにおいて、外歯と内歯のいずれか一方は、歯先部と噛合部と歯底部とをそれぞれ独立した曲線で形成し、一方の噛合部は歯先部および歯底部との接続箇所を、自己の曲線と同一の接線を有し曲率が大きい曲線で形成したことを特徴とする内接歯車ポンプがそれである。 In order to achieve this problem, the present invention has taken the following measures. That is,
A ring-shaped internal gear having internal teeth and an external gear having external teeth that mesh with the internal teeth of the internal gear are housed in an eccentric manner inside the internal gear. In the internal gear pump having a larger number, one of the external teeth and the internal teeth forms a tooth tip portion, a mesh portion, and a tooth bottom portion with independent curves, and the one mesh portion is a tooth tip portion and The internal gear pump is characterized in that the connecting portion with the tooth bottom portion is formed by a curved line having the same tangent as its own curve and having a large curvature.

この場合、前記接続箇所の曲線は、歯先部および歯底部に向けて曲率を漸次大きくしてもよい。また、前記噛合部の曲線は、円弧で形成してもよい。   In this case, the curve of the connection portion may gradually increase the curvature toward the tooth tip portion and the tooth bottom portion. Further, the curve of the meshing portion may be formed by an arc.

以上詳述したように、請求項１に記載の発明は、外歯と内歯のいずれか一方は、歯先部と噛合部と歯底部とをそれぞれ独立した曲線で形成し、この一方の歯の噛合部は歯先部および歯底部との接続箇所を、自己の曲線と同一の接線を有し曲率が大きい曲線で接続した。このため、接続箇所を噛合部より後退させることができるから、偏心量を大きくしても他方の歯との接触を回避でき、偏心量の設定の自由度を増し、吐出量をより一層増加可能とすることができる。   As described above in detail, according to the first aspect of the present invention, any one of the external teeth and the internal teeth forms the tooth tip portion, the meshing portion, and the tooth bottom portion with independent curves, and this one tooth. The meshing part connected the connecting part of the tooth tip part and the tooth bottom part with a curve having a tangent line identical to its own curve and a large curvature. For this reason, since the connection location can be retracted from the meshing portion, contact with the other tooth can be avoided even if the amount of eccentricity is increased, the degree of freedom in setting the amount of eccentricity can be increased, and the discharge rate can be further increased It can be.

また、請求項２に記載の発明は、請求項１に記載の発明の効果に加え、接続箇所の曲線は、歯先部および歯底部に向けて曲率を漸次大きくした。このため、噛合部と接続箇所との曲率の変動を滑らかにできるから、噛合部のころがり速度、すべり速度が急変することを抑制でき、歯の接触に伴う騒音を低減することができる。   In addition to the effect of the invention of the first aspect, the invention according to the second aspect gradually increases the curvature of the curve of the connection portion toward the tooth tip portion and the tooth bottom portion. For this reason, since the fluctuation | variation of the curvature of a meshing part and a connection location can be made smooth, it can suppress that the rolling speed of a meshing part and a sliding speed change rapidly, and the noise accompanying a tooth contact can be reduced.

また、請求項３に記載の発明は、請求項１に記載の発明の効果に加え、噛合部の曲線は円弧で形成した。このため、噛合部の曲線を用途に応じた最適なものに容易に設計することができる。   Further, in the invention described in claim 3, in addition to the effect of the invention described in claim 1, the curve of the meshing portion is formed by an arc. For this reason, the curve of the meshing portion can be easily designed to be optimal according to the application.

本発明の一実施形態を示した内接歯車ポンプの断面図である。It is sectional drawing of the internal gear pump which showed one Embodiment of this invention. 図１の要部拡大図である。It is a principal part enlarged view of FIG.

以下、本発明の一実施形態を図面に基づき説明する。
図１において、１はリング状の内歯歯車で、１６枚の内歯１Ａを有し、回転中心Ｈを中心としてハウジング２へ回転自在に収容している。３は外歯歯車で、内歯１Ａと内接噛み合いする１５枚の外歯３Ａを有し、内歯歯車１の内部に回転中心Ｈと偏心した回転中心Ｈ１を中心として回転自在に収容している。そして、内歯歯車１と外歯歯車３との偏心量Ｅ１は、内歯歯車１の回転中心Ｈと外歯歯車３の回転中心Ｈ１との間の寸法としている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a ring-shaped internal gear, which has 16 internal teeth 1 </ b> A, and is housed in a housing 2 so as to be rotatable about a rotation center H. Reference numeral 3 denotes an external gear, which has 15 external teeth 3A that are in mesh with the internal teeth 1A. The external gear 3 is accommodated in the internal gear 1 so as to be rotatable about a rotation center H1 and an eccentric rotation center H1. Yes. The eccentricity E1 between the internal gear 1 and the external gear 3 is a dimension between the rotation center H of the internal gear 1 and the rotation center H1 of the external gear 3.

４は外歯歯車３を回転駆動する駆動軸で、外歯歯車３に係合する。５は油を吸入する吸入ポート、６は油を吐出する吐出ポートで、回転中心Ｈ、Ｈ１を通る直線を対称とする径方向の対称位置でそれぞれハウジング２に穿設している。   Reference numeral 4 denotes a drive shaft that rotationally drives the external gear 3 and engages with the external gear 3. Reference numeral 5 denotes a suction port for sucking oil, and reference numeral 6 denotes a discharge port for discharging oil, which are formed in the housing 2 at symmetrical positions in the radial direction that are symmetric with respect to straight lines passing through the rotation centers H and H1.

図２に、内歯歯車１の内歯１Ａと外歯歯車３の外歯３Ａの歯形形状の詳細を示す。
内歯１Ａは、歯先部７Ａと歯底部７Ｂと噛合部７Ｃとで構成している。歯先部７Ａは中心７Ｄを有する半径Ｒ１の円弧で形成し、点ａｂ間を結ぶ。中心７Ｄは内歯歯車１の回転中心Ｈと、歯先部７Ａの周方向中心とを通る線上に位置する。歯底部７Ｂは中心７Ｅを有する半径Ｒ２の円弧と、半径Ｒ２より小径で中心７Ｆを有する半径Ｒ３の円弧とで形成し、半径Ｒ２の円弧で点ｃｄ間を結び、半径Ｒ３の円弧で点ｄｅ間を結ぶ。半径Ｒ２の円弧は、後述詳記する外歯歯車３Ａの歯先部８Ａにより創成される包絡曲線より若干大きい円弧で形成される。中心７Ｅは内歯歯車１の回転中心Ｈと、歯底部７Ｂの周方向中心とを通る線上に位置する。噛合部７Ｃは中心７Ｇを有する半径Ｒ４の円弧と、半径Ｒ４の円弧の周方向一方側で歯先部７Ａとの接続箇所を成す曲線７Ｈと、半径Ｒ４の円弧の周方向他方側で歯底部７Ｂとの接続箇所を成す曲線７Ｉとで形成し、半径Ｒ４の円弧で点ｆｇ間を結び、曲線７Ｈで点ｂｆ間を結び、曲線７Ｉで点ｅｇ間を結ぶ。半径Ｒ４は半径Ｒ１、Ｒ２より大径に設けている。 FIG. 2 shows details of tooth profile shapes of the internal teeth 1 </ b> A of the internal gear 1 and the external teeth 3 </ b> A of the external gear 3.
The internal tooth 1A includes a tooth tip portion 7A, a tooth bottom portion 7B, and a meshing portion 7C. The tooth tip portion 7A is formed by an arc of radius R1 having a center 7D and connects the points ab. The center 7D is located on a line passing through the rotation center H of the internal gear 1 and the circumferential center of the tooth tip portion 7A. The tooth bottom portion 7B is formed by an arc of radius R2 having a center 7E and an arc of radius R3 having a diameter smaller than the radius R2 and having a center 7F. The arc radii R2 connects the points cd, and an arc of radius R3 connects the point de. Connect. The arc of radius R2 is formed as an arc that is slightly larger than the envelope curve created by the tooth tip portion 8A of the external gear 3A, which will be described in detail later. The center 7E is located on a line passing through the rotation center H of the internal gear 1 and the circumferential center of the tooth bottom portion 7B. The meshing portion 7C includes an arc of radius R4 having a center 7G, a curve 7H forming a connection point with the tooth tip portion 7A on one side in the circumferential direction of the arc of radius R4, and a tooth bottom portion on the other side in the circumferential direction of the arc of radius R4. It is formed by a curve 7I that forms a connection point with 7B, and the points fg are connected by an arc of radius R4, the points bf are connected by a curve 7H, and the points eg are connected by a curve 7I. The radius R4 is larger than the radii R1 and R2.

噛合部７Ｃの接続箇所を成す曲線７Ｈ、７Ｉは、半径Ｒ４の円弧と同一の接線を有し、かつ曲率を大きく設け、曲線７Ｈは歯先部７Ａに向けて曲率が漸次大きくなる曲線とし、曲線７Ｉは歯底部７Ｂに向けて曲率が漸次大きくなる曲線としている。   Curves 7H and 7I forming the connection portion of the meshing portion 7C have the same tangent as the arc of radius R4 and a large curvature, and the curve 7H is a curve in which the curvature gradually increases toward the tooth tip portion 7A. The curve 7I is a curve in which the curvature gradually increases toward the root portion 7B.

外歯３Ａは、歯先部８Ａと歯底部８Ｂと噛合部８Ｃとで構成し、歯先部８Ａと噛合部８Ｃとの間を第１接続部８Ｄで接続し、歯底部８Ｂと噛合部８Ｃとの間を第２接続部８Ｅで接続している。歯先部８Ａは、内歯１Ａの歯先部７Ａを形成する半径Ｒ１の円弧により創成される包絡曲線で形成し、点ＣＤ間を結ぶ。歯底部８Ｂは、内歯１Ａの歯先部７Ａを形成する半径Ｒ１の円弧により創成される包絡曲線より若干大きい曲線で形成し、点ＡＢ間を結ぶ。噛合部８Ｃは、内歯１Ａの噛合部７Ｃを形成する半径Ｒ４の円弧により創成される包絡曲線で形成し、点ＥＦ間を結ぶ。第１接続部８Ｄは、歯先部８Ａと噛合部８Ｃとの間を丸めて接続するもので、半径Ｒ５の円弧で形成し、点ＤＥ間を結ぶ。第２接続部８Ｅは、歯底部８Ｂと噛合部８Ｃとの間を丸めて接続するもので、半径Ｒ６の円弧で形成し、点ＢＦ間を結ぶ。   The external tooth 3A includes a tooth tip portion 8A, a tooth bottom portion 8B, and a meshing portion 8C. The tooth tip portion 8A and the meshing portion 8C are connected by a first connection portion 8D, and the tooth bottom portion 8B and the meshing portion 8C. Are connected by the second connecting portion 8E. The tooth tip portion 8A is formed by an envelope curve created by an arc having a radius R1 that forms the tooth tip portion 7A of the internal tooth 1A, and connects the points CD. The tooth bottom portion 8B is formed by a curve slightly larger than the envelope curve created by the arc of radius R1 forming the tooth tip portion 7A of the internal tooth 1A, and connects the points AB. The meshing portion 8C is formed by an envelope curve created by an arc of radius R4 that forms the meshing portion 7C of the internal tooth 1A, and connects the points EF. The first connection portion 8D is formed by connecting the tip portion 8A and the meshing portion 8C by rounding, and is formed by an arc having a radius R5 and connecting the points DE. The second connection portion 8E is formed by rounding and connecting between the tooth bottom portion 8B and the meshing portion 8C, and is formed by an arc having a radius R6 and connecting the points BF.

次に、かかる構成の作動を説明する。
駆動軸４により外歯歯車３を回転方向Ａに回転駆動すると、外歯歯車３と内接噛み合いする内歯歯車１が回転駆動され、吸入ポート５より吸入された油が吐出ポート６より吐出される。 Next, the operation of this configuration will be described.
When the external gear 3 is rotationally driven in the rotational direction A by the drive shaft 4, the internal gear 1 in mesh with the external gear 3 is rotationally driven, and the oil sucked from the suction port 5 is discharged from the discharge port 6. The

かかる作動で、内歯１Ａは、歯先部７Ａと噛合部７Ｃと歯底部７Ｂとをそれぞれ独立した曲線で形成し、噛合部７Ｃは歯先部７Ａおよび歯底部７Ｂとの接続箇所を、自己の曲線と同一の接線を有し曲率が大きい曲線７Ｈ、７Ｉで接続した。このため、接続箇所を噛合部７Ｃより後退させることができるから、偏心量Ｅ１を大きくしても外歯３Ａとの接触を回避でき、偏心量Ｅ１の設定の自由度を増し、吐出量をより一層増加可能とすることができる。   With this operation, the inner tooth 1A forms the tooth tip portion 7A, the meshing portion 7C, and the tooth bottom portion 7B with independent curves, and the meshing portion 7C defines the connection point between the tooth tip portion 7A and the tooth bottom portion 7B. They were connected by curves 7H and 7I having the same tangent as the curve No. 1 and having a large curvature. For this reason, since the connection location can be retracted from the meshing portion 7C, contact with the external teeth 3A can be avoided even if the eccentric amount E1 is increased, the degree of freedom in setting the eccentric amount E1 is increased, and the discharge amount is further increased. It can be increased further.

また、噛合部７Ｃの接続箇所の曲線７Ｈ、７Ｉは、歯先部７Ａおよび歯底部７Ｂに向けて曲率を漸次大きくした。このため、噛合部７Ｃと接続箇所との曲率の変動を滑らかにできるから、噛合部７Ｃのころがり速度、すべり速度が急変することを抑制でき、内歯１Ａと外歯３Ａとの歯の接触に伴う騒音を低減することができる。   In addition, the curves 7H and 7I of the connecting portions of the meshing portion 7C gradually increased the curvature toward the tooth tip portion 7A and the tooth bottom portion 7B. For this reason, since the fluctuation | variation of the curvature of the meshing part 7C and a connection location can be made smooth, it can suppress that the rolling speed of the meshing part 7C and a sliding speed change suddenly, and the tooth contact of the internal tooth 1A and the external tooth 3A The accompanying noise can be reduced.

また、噛合部７Ｃの曲線は中心７Ｇを有する半径Ｒ４の円弧で形成した。このため、噛合部７Ｃの曲線を中心７Ｇや半径Ｒ４を変更することで簡単に変更できるから、噛合部７Ｃの曲線を用途に応じた最適なものに容易に設計することができる。   Further, the curve of the meshing portion 7C was formed by an arc having a center 7G and a radius R4. For this reason, since the curve of the meshing portion 7C can be easily changed by changing the center 7G and the radius R4, the curve of the meshing portion 7C can be easily designed to be optimal according to the application.

なお、一実施形態では、内歯１Ａは歯先部７Ａと噛合部７Ｃと歯底部７Ｂとをそれぞれ独立した曲線で形成し、外歯３Ａの歯底部８Ｂと噛合部８Ｃとをそれぞれ内歯１Ａの歯先部７Ａと噛合部７Ｃとで創成される包絡曲線を基準として形成したが、これとは逆に、外歯３Ａを歯先部８Ａと噛合部８Ｃと歯底部８Ｂとをそれぞれ独立した曲線で形成し、内歯１Ａの歯底部７Ｂと噛合部７Ｃとをそれぞれ外歯３Ａの歯先部８Ａと噛合部８Ｃとで創成される包絡曲線を基準として形成しても良い。また、噛合部７Ｃの曲線を半径Ｒ４の円弧で形成したが、これに限定されるものではなく、サイクロイド曲線で形成しても良いことは勿論である。   In one embodiment, the inner tooth 1A has a tip portion 7A, a meshing portion 7C, and a tooth bottom portion 7B formed by independent curves, and the tooth bottom portion 8B and the meshing portion 8C of the external tooth 3A are respectively connected to the inner tooth 1A. In contrast to this, the outer teeth 3A are formed independently of the tooth tip portion 8A, the meshing portion 8C, and the tooth bottom portion 8B, respectively, with reference to the envelope curve created by the tooth tip portion 7A and the meshing portion 7C. It may be formed by a curve, and the root part 7B and the meshing part 7C of the inner tooth 1A may be formed on the basis of the envelope curves created by the tooth tip part 8A and the meshing part 8C of the external tooth 3A, respectively. Further, although the curve of the meshing portion 7C is formed by an arc having a radius R4, the present invention is not limited to this and may be formed by a cycloid curve.

１：内歯歯車
１Ａ：内歯
３：外歯歯車
３Ａ：外歯
７Ａ、８Ａ：歯先部
７Ｂ、８Ｂ：歯底部
７Ｃ、８Ｃ：噛合部
７Ｈ、７Ｉ：曲線 1: Internal gear 1A: Internal gear 3: External gear 3A: External gear 7A, 8A: Top part 7B, 8B: Bottom part 7C, 8C: Engagement part 7H, 7I: Curve

Claims (3)

内歯を有するリング状の内歯歯車と、内歯歯車の内歯と内接噛み合いする外歯を有する外歯歯車を内歯歯車の内部に偏心して収容し、外歯よりも内歯の歯数が１枚多い内接歯車ポンプにおいて、外歯と内歯のいずれか一方は、歯先部と噛合部と歯底部とをそれぞれ独立した曲線で形成し、一方の噛合部は歯先部および歯底部との接続箇所を、自己の曲線と同一の接線を有し曲率が大きい曲線で形成したことを特徴とする内接歯車ポンプ。   A ring-shaped internal gear having internal teeth and an external gear having external teeth that mesh with the internal teeth of the internal gear are housed in an eccentric manner inside the internal gear. In the internal gear pump having a larger number, one of the external teeth and the internal teeth forms a tooth tip portion, a mesh portion, and a tooth bottom portion with independent curves, and the one mesh portion is a tooth tip portion and An internal gear pump characterized in that a connecting portion with a tooth bottom portion is formed by a curved line having the same tangent as its own curve and having a large curvature. 前記接続箇所の曲線は、歯先部および歯底部に向けて曲率を漸次大きくしたことを特徴とする請求項１に記載の内接歯車ポンプ。   2. The internal gear pump according to claim 1, wherein the curve of the connection portion has a gradually increased curvature toward the tooth tip portion and the tooth bottom portion. 前記噛合部の曲線は、円弧で形成したことを特徴とする請求項１に記載の内接歯車ポンプ。   The internal gear pump according to claim 1, wherein the curve of the meshing portion is formed by an arc.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10205458A (en) * 1997-01-27 1998-08-04 Mitsubishi Motors Corp Inscribed gear pump
JP2011017318A (en) * 2009-07-10 2011-01-27 Sumitomo Electric Sintered Alloy Ltd Rotor for pumps and internal gear pump using the same
US20130112028A1 (en) * 2011-11-08 2013-05-09 Yamada Manufacturing Co., Ltd. Pump rotor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10205458A (en) * 1997-01-27 1998-08-04 Mitsubishi Motors Corp Inscribed gear pump
JP2011017318A (en) * 2009-07-10 2011-01-27 Sumitomo Electric Sintered Alloy Ltd Rotor for pumps and internal gear pump using the same
US20130112028A1 (en) * 2011-11-08 2013-05-09 Yamada Manufacturing Co., Ltd. Pump rotor

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