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JP2005188399A - Inscribed gear pump - Google Patents

Inscribed gear pump

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Publication number
JP2005188399A
JP2005188399A JP2003431231A JP2003431231A JP2005188399A JP 2005188399 A JP2005188399 A JP 2005188399A JP 2003431231 A JP2003431231 A JP 2003431231A JP 2003431231 A JP2003431231 A JP 2003431231A JP 2005188399 A JP2005188399 A JP 2005188399A
Authority
JP
Japan
Prior art keywords
rotor
metal
outer rotor
peripheral teeth
gear pump
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.)
Pending
Application number
JP2003431231A
Other languages
Japanese (ja)
Inventor
Yoshihiro Horikawa
義広 堀川
Katsuaki Hosono
克明 細野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to JP2003431231A priority Critical patent/JP2005188399A/en
Priority to PCT/JP2004/019254 priority patent/WO2005066502A1/en
Publication of JP2005188399A publication Critical patent/JP2005188399A/en
Pending legal-status Critical Current

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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
    • F04C2/10—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
    • F04C2/102—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 the two members rotating simultaneously around their respective axes
    • 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
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F04C2230/22—Manufacture essentially without removing material by sintering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/20—Resin

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

【課題】 騒音を低減すると共に脈動等が少ない内接ギヤポンプを提供する。
【解決手段】 ケーシング１内に回転自在に装着されると共に内周歯２を有するアウターロータ３と、内周歯２に噛合させられる外周歯４を有するインナーロータ５とを備える。アウターロータ３を金属により形成すると共にインナーロータ５を合成樹脂により形成する。両ロータ３,５は鉄系焼結金属とエンジニアリングプラスチックとの接触となり、金属間接触に伴う金属接触音はなくなる。ケーシング１の円筒部１ａとアウターロータ３との間に僅かな隙間等があるような場合には、内周歯２と外周歯４との隙間Ｓの液体の圧力が高くなったときアウターロータ３が変形しようとするが、アウターロータ３は強度が大きく変形により生ずる脈動などを防止することができる。
【選択図】図１
PROBLEM TO BE SOLVED: To provide an internal gear pump that reduces noise and has less pulsation and the like.
SOLUTION: An outer rotor 3 that is rotatably mounted in a casing 1 and has inner peripheral teeth 2 and an inner rotor 5 that has outer peripheral teeth 4 meshed with the inner peripheral teeth 2 are provided. The outer rotor 3 is made of metal and the inner rotor 5 is made of synthetic resin. Both rotors 3 and 5 are in contact with the iron-based sintered metal and the engineering plastic, and there is no metal contact noise associated with metal-to-metal contact. When there is a slight gap between the cylindrical portion 1a of the casing 1 and the outer rotor 3, the outer rotor 3 is increased when the liquid pressure in the gap S between the inner peripheral teeth 2 and the outer peripheral teeth 4 is increased. However, the outer rotor 3 has high strength and can prevent pulsation caused by the deformation.
[Selection] Figure 1

Description

本発明は、自動車の燃料ポンプやオイルポンプなどに使用される内接型ギアポンプに関するものである。   The present invention relates to an internal gear pump used for a fuel pump or an oil pump of an automobile.

内接ギヤポンプは、歯を内周に有するアウターロータ内に、このアウターロータの歯に噛み合う歯を外周に有するインナーロータを所定量偏心させて組付けたものである。そしてアウターロータの歯数は、インナーロータの歯数よりも１つだけ多くなっている。このインナーロータには、駆動軸を連結するための円柱形状の中心孔が形成されており、この中心孔は、インナーロータの中心軸を貫くものである。そして、両ロータは、これら両者の中心軸を通る平面の両側に吸込口と吐出口とを各々有するケーシング内に組付けられる。そして使用時には、インナーロータを回転駆動して、歯相互の噛合によりアウターロータも回転させ、吸込口から吸込んだ液体燃料やオイルを両ロータ間で吐出口へ送り出すものである。なお、両ロータは、例えば、金属を主成分とする原料粉末を圧縮して成形し、加熱して焼結することにより製造されるものである。
特開平６−２４９７５２号公報 The internal gear pump is assembled by decentering a predetermined amount of an inner rotor having teeth that mesh with the teeth of the outer rotor in an outer rotor having teeth on the inner periphery. The number of teeth of the outer rotor is one more than the number of teeth of the inner rotor. The inner rotor is formed with a cylindrical center hole for connecting the drive shaft, and the center hole penetrates the center axis of the inner rotor. And both rotors are assembled | attached in the casing which each has a suction inlet and a discharge outlet in the both sides of the plane which passes along both these central axes. In use, the inner rotor is driven to rotate, the outer rotor is also rotated by meshing the teeth, and the liquid fuel and oil sucked from the suction ports are sent out between the rotors to the discharge ports. In addition, both rotors are manufactured by, for example, compressing and molding a raw material powder containing metal as a main component, and heating and sintering.
JP-A-6-249752

従来技術においては、両ロータを金属により形成したものであるが、このような金属製のアウターロータ及びインナーロータにおいては、インナーロータを回転駆動して、歯相互の噛合によりアウターロータも回転させたとき、両歯の接触の際に金属接触音が発生し、多少の騒音が生ずる虞がある。この多少の騒音を低減するには例えば防音材等を使用すればよいが、内接ギヤポンプの回りが大きくなってしまう等の問題がある。   In the prior art, both rotors are made of metal. In such a metal outer rotor and inner rotor, the inner rotor is driven to rotate, and the outer rotor is also rotated by meshing teeth. At the time of contact between both teeth, a metal contact sound is generated, and there is a possibility that some noise is generated. In order to reduce this slight noise, for example, a soundproof material or the like may be used. However, there is a problem that the circumference of the internal gear pump becomes large.

本発明の解決しようとする問題点は、騒音を低減すると共に脈動等が少ない内接ギヤポンプを提供する点である。   The problem to be solved by the present invention is to provide an internal gear pump that reduces noise and reduces pulsation and the like.

請求項１の発明は、ケーシング内に回転自在に装着されると共に内周歯を有するアウターロータと、前記アウターロータの内周歯に噛合させられる外周歯を有するインナーロータとを備えた内接型ギアポンプにおいて、前記アウターロータを金属により形成すると共に前記インナーロータを合成樹脂で形成したことを特徴とする内接型ギアポンプである。   The invention according to claim 1 is an inscribed type including an outer rotor that is rotatably mounted in a casing and has inner peripheral teeth, and an inner rotor that has outer peripheral teeth meshed with the inner peripheral teeth of the outer rotor. In the gear pump, the inner rotor is formed of metal, and the inner rotor is formed of synthetic resin.

請求項２の発明は、前記金属を鉄系焼結金属とし、前記合成樹脂をエンジニアリングプラスチックとしたことを特徴とする請求項１記載の内接型ギアポンプである。   The invention according to claim 2 is the internal gear pump according to claim 1, wherein the metal is an iron-based sintered metal and the synthetic resin is an engineering plastic.

請求項１の発明によれば、アウターロータとインナーロータは金属製内周歯と合成樹脂製外周歯との接触となるので、金属接触音を一掃することができると共に、アウターロータを金属製とすることで強度を確保でき、液体圧に抗することができるので脈動などが発生しにくくなる。   According to the invention of claim 1, since the outer rotor and the inner rotor are in contact with the metal inner peripheral tooth and the synthetic resin outer peripheral tooth, the metal contact sound can be eliminated and the outer rotor is made of metal. By doing so, the strength can be ensured and the liquid pressure can be resisted, so that pulsation or the like hardly occurs.

請求項２の発明によれば、アウターロータを鉄系焼結金属により形成することにより、内周歯等を比較的容易に形成することができ、さらにインナーロータをエンジニアリングプラスチックにより形成することにより強度等を確保することができる。   According to the invention of claim 2, by forming the outer rotor from an iron-based sintered metal, the inner peripheral teeth and the like can be formed relatively easily, and further, the inner rotor is formed from an engineering plastic to increase the strength. Etc. can be secured.

本発明における好適な実施の形態について、添付図面を参照して説明する。尚、以下に説明する実施の形態は、特許請求の範囲に記載された本発明の内容を限定するものではない。また、以下に説明される構成の全てが、本発明の必須要件であるとは限らない。   Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

図１は第１実施例を示しており、内接型ギアポンプは、ケーシング１の円筒部１ａ内に同軸状に回転自在に設けられ内周歯２を備えた回転体であるアウターロータ３と、このアウターロータ３の内周歯２に噛合させられる外周歯４を有する回転体であるインナーロータ５と、このインナーロータ５を支持すると共に、このインナーロータ５の回転中心Ｏ2を前記アウターロータ３の回転中心Ｏ1から所定方向へ偏心させて保持する駆動軸（図示せず）の挿入孔６を備えている。そして、一対のロータ３,５の各歯２,４の歯面間に区画して隙間Ｓが形成される。また、前記ケーシング１の両ロータ３,５の端面と対向する部分には、前記隙間Ｓ内に液体燃料、作動油等の液体を供給する吸入口７と、前記隙間Ｓに吸入・密閉された液体が吐出され、この液体をケーシング１の外部へ導く吐出口８が形成されている。 FIG. 1 shows a first embodiment, wherein an inscribed gear pump includes an outer rotor 3 that is a rotating body that is provided coaxially within a cylindrical portion 1a of a casing 1 and is provided with inner peripheral teeth 2. An inner rotor 5, which is a rotating body having outer peripheral teeth 4 meshed with the inner peripheral teeth 2 of the outer rotor 3, and supports the inner rotor 5, and the rotation center O 2 of the inner rotor 5 is used as the outer rotor 3. and a insertion hole 6 of the drive shaft (not shown) which is eccentric from the rotation center O 1 in a predetermined direction and holds. A gap S is formed by partitioning between the tooth surfaces of the teeth 2 and 4 of the pair of rotors 3 and 5. Further, a portion of the casing 1 facing the end faces of the rotors 3 and 5 is sucked and sealed in the gap S with a suction port 7 for supplying liquid such as liquid fuel or hydraulic oil into the gap S. A discharge port 8 is formed for discharging the liquid and guiding the liquid to the outside of the casing 1.

さらに、前記アウターロータ３は鉄系焼結金属等の金属により形成されている。鉄系焼結金属、好ましくはステンレス鋼系焼結金属はステンレス鋼系金属を主成分とする原料粉末を成形型に挿入した後にこれを圧縮して成形し、その後加熱して焼結することにより形成したものである。前記インナーロータ５は、工業的な分野で、主に金属に代わり使用されるエンジニアリングプラスチックにより形成される。エンジニアリングプラスチックとしては、ポリカーボネートやポリアミドなどの他に特にＰＥＥＫ（ポリエーテルエーテルケトン）やＰＰＳ（ポリフェニレンサルファイド）等の耐油性、耐薬品性、耐硫黄性に優れ、さらには高強度で耐久性に優れるものが好ましい。エンジニアリングプラスチックの成形は、成形型のキャビティに溶融した樹脂を射出した後に冷却、固化して成形したものである。尚、前記挿入孔６を成形時に同時に成形するものである。   Further, the outer rotor 3 is made of a metal such as an iron-based sintered metal. An iron-based sintered metal, preferably a stainless steel-based sintered metal, is formed by inserting a raw material powder mainly composed of a stainless steel-based metal into a mold and then compressing and molding it, followed by heating and sintering. Formed. The inner rotor 5 is formed of an engineering plastic used mainly in place of metal in the industrial field. As engineering plastics, in addition to polycarbonate, polyamide, etc., especially PEEK (polyetheretherketone) and PPS (polyphenylene sulfide) are excellent in oil resistance, chemical resistance, sulfur resistance, and high strength and durability. Those are preferred. In engineering plastic molding, molten resin is injected into a cavity of a mold and then cooled and solidified. The insertion hole 6 is formed at the same time as molding.

次に前記構成についてその作用を説明する。内接型ギアポンプは、両ロータ３,５の相対回転により、鉄系焼結金属により形成された内周歯２とエンジニアリングプラスチックにより形成された外周歯４とが接触し噛合してこれら内周歯２と外周歯４の間に形成される隙間Ｓの容積を変化させることにより、隙間Ｓの増加時において吸入口７から液体を吸引し、この吸引した液体を両ロータ３,５の回転によって搬送し、さらに、前記隙間Ｓの減少時において前記液体を吐出口８から排出するようになっている。   Next, the operation of the above configuration will be described. In the internal gear pump, due to the relative rotation of the rotors 3 and 5, the inner peripheral teeth 2 formed of iron-based sintered metal and the outer peripheral teeth 4 formed of engineering plastic come into contact and mesh with each other. By changing the volume of the gap S formed between the outer teeth 4 and the outer peripheral teeth 4, the liquid is sucked from the suction port 7 when the gap S is increased, and the sucked liquid is conveyed by the rotation of the rotors 3 and 5. Further, when the gap S is reduced, the liquid is discharged from the discharge port 8.

以上のように、前記内周歯２と外周歯４とが接触した際、内周歯２は鉄系焼結金属により形成されているものの、外周歯４はエンジニアリングプラスチックにより形成されているので、両ロータ３,５は鉄系焼結金属とエンジニアリングプラスチックとの接触となり、金属間接触に伴う金属接触音はなくなる。   As described above, when the inner peripheral tooth 2 and the outer peripheral tooth 4 are in contact with each other, the inner peripheral tooth 2 is formed of an iron-based sintered metal, but the outer peripheral tooth 4 is formed of an engineering plastic. Both rotors 3 and 5 are in contact with the iron-based sintered metal and the engineering plastic, and there is no metal contact noise associated with metal-to-metal contact.

また、両ロータ３,５の相対回転により、内周歯２と外周歯４の間に形成される隙間Ｓの容積を変化して液体圧力が高くなるに伴いアウターロータ３の吐出口８側ではアウターロータ３をケーシング１に押し付ける圧力が高くなり、アウターロータ３が変形しやすい、この結果ケーシング１の円筒部１ａとアウターロータ３との間に僅かな隙間等があるような場合には、アウターロータ３が変形しようとするが、アウターロータ３は鉄系焼結金属により形成されているので、強度が大きく液体の圧力に抗し変形を阻止して変形により生ずる脈動などを防止することができる。しかも、アウターロータ３を鉄系焼結金属により形成したので、アウターロータ３の外周から内周歯２の歯底までの厚みを薄くできる。   In addition, the relative rotation of the rotors 3 and 5 changes the volume of the gap S formed between the inner peripheral tooth 2 and the outer peripheral tooth 4 to increase the liquid pressure. When the pressure that presses the outer rotor 3 against the casing 1 is increased and the outer rotor 3 is likely to be deformed. As a result, there is a slight gap between the cylindrical portion 1a of the casing 1 and the outer rotor 3. Although the rotor 3 tends to be deformed, the outer rotor 3 is made of an iron-based sintered metal, so that the strength is high and the pressure of the liquid is resisted and the deformation is prevented to prevent pulsation caused by the deformation. . In addition, since the outer rotor 3 is formed of iron-based sintered metal, the thickness from the outer periphery of the outer rotor 3 to the root of the inner peripheral teeth 2 can be reduced.

さらに、アウターロータ３を鉄系焼結金属により形成することにより、内周歯２等を成形型を利用して比較的容易に形成することができ、さらにインナーロータをエンジニアリングプラスチックにより形成することにより強度等を確保することができる。   Furthermore, by forming the outer rotor 3 from an iron-based sintered metal, the inner peripheral teeth 2 and the like can be formed relatively easily using a molding die, and the inner rotor is formed from engineering plastic. Strength etc. can be secured.

以上のように本発明にかかる内接型ギアポンプは、自動車の燃料ポンプやオイルポンプなどの他に産業用機器や家庭用機器の各種用途にも適用できる。   As described above, the inscribed gear pump according to the present invention can be applied to various uses of industrial equipment and household equipment in addition to automobile fuel pumps and oil pumps.

本発明の第１実施例を示す断面図である。It is sectional drawing which shows 1st Example of this invention.

符号の説明Explanation of symbols

１ ケーシング
２ 内周歯
３ アウターロータ
４ 外周歯
５ インナーロータ 1 Casing 2 Inner peripheral teeth 3 Outer rotor 4 Outer peripheral teeth 5 Inner rotor

Claims (2)

ケーシング内に回転自在に装着されると共に内周歯を有するアウターロータと、前記アウターロータの内周歯に噛合させられる外周歯を有するインナーロータとを備えた内接型ギアポンプにおいて、前記アウターロータを金属により形成すると共に前記インナーロータを合成樹脂で形成したことを特徴とする内接型ギアポンプ。   An internal gear pump comprising an outer rotor rotatably mounted in a casing and having inner peripheral teeth, and an inner rotor having outer peripheral teeth meshed with the inner peripheral teeth of the outer rotor. An internal gear pump characterized in that it is made of metal and the inner rotor is made of synthetic resin. 前記金属を鉄系焼結金属とし、前記合成樹脂をエンジニアリングプラスチックとしたことを特徴とする請求項１記載の内接型ギアポンプ。   2. The internal gear pump according to claim 1, wherein the metal is an iron-based sintered metal and the synthetic resin is an engineering plastic.
JP2003431231A 2003-12-25 2003-12-25 Inscribed gear pump Pending JP2005188399A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2003431231A JP2005188399A (en) 2003-12-25 2003-12-25 Inscribed gear pump
PCT/JP2004/019254 WO2005066502A1 (en) 2003-12-25 2004-12-22 Internal gear pump

Applications Claiming Priority (1)

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JP2003431231A JP2005188399A (en) 2003-12-25 2003-12-25 Inscribed gear pump

Publications (1)

Publication Number Publication Date
JP2005188399A true JP2005188399A (en) 2005-07-14

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WO (1) WO2005066502A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
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CN102654125A (en) * 2011-03-03 2012-09-05 Ti集团自动推进系统有限责任公司 Positive displacement fluid pump
WO2013171630A1 (en) * 2012-05-15 2013-11-21 Sabic Innovative Plastics Ip B.V. Polyetherimide pump

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* Cited by examiner, † Cited by third party
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