JPS60128983A - Driven gear for rotary gear pump - Google Patents

Driven gear for rotary gear pump

Info

Publication number
JPS60128983A
JPS60128983A JP23590483A JP23590483A JPS60128983A JP S60128983 A JPS60128983 A JP S60128983A JP 23590483 A JP23590483 A JP 23590483A JP 23590483 A JP23590483 A JP 23590483A JP S60128983 A JPS60128983 A JP S60128983A
Authority
JP
Japan
Prior art keywords
driven gear
gear
rotary
sintered alloy
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
JP23590483A
Other languages
Japanese (ja)
Inventor
Yasuyoshi Saegusa
三枝　康能
Aoi Sugimoto
杉本　葵
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP23590483A priority Critical patent/JPS60128983A/en
Publication of JPS60128983A publication Critical patent/JPS60128983A/en
Pending legal-status Critical Current

Links

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
    • 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
    • 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
    • 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
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

PURPOSE:To reduce the weight of driven gear while to prevent noise when operating a gear pump, by making the driven gear of rotary pump with iron system sintered alloy while lacking the fill at the outercircumferential section. CONSTITUTION:The driven gear 3 (outer rotor) of rotary gear pump is made of ferro system sintered alloy to lack the fill directly from the outercircumferential section of driven gear 3 or through provision of a plurality of through-holes 6 at the outercircumferential section thus to reduce the weight of driven gear 3. Similar effect can be achieved when employing light alloy such as aluminum or sintered alloy such as ceramics for driven gear 3. Teflon or molybdenum coating is applied onto the surface of driven gear 3 to prevent noise.

Description

【発明の詳細な説明】 （イ）技術分野 この発明は騒音低重と運転時の動力損失の減少に効果を
発揮する回転ギヤポンプ用ドリブンギヤーに′関するも
のである。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a driven gear for a rotary gear pump that is effective in reducing noise, weight, and power loss during operation.

（ロ）技術背景 ｄ来、回転ギヤポンプにおけるドライブギヤー（インナ
ー０−ター）とドリブンギヤー（アウター０−ター）は
ともに開枠の鉄系材料よりなるものが多く用いられてい
る↓ このため回転ギヤポ□ンプの運転時における騒音および
動力損失の大きいことが難点とされている。(b) Technical background Since then, both the drive gear (inner gear) and driven gear (outer gear) in rotary gear pumps are often made of open-frame iron-based materials. □Difficulties include high noise and power loss during operation of the pump.

ここで騒音とはドリブンギヤーのドライブギヤーの噛み
合い音が特に大きいことが指摘されているのであり、ま
た動力損失は運転時の所要トルクの大きいことが原因で
ある。It has been pointed out that the noise here is particularly loud due to the meshing noise of the driven gear, and the power loss is caused by the large torque required during operation.

そしてこれらの欠点は、これまで主としてドリブンギヤ
ーとドライブギヤーの歯形状およびこれらの歯形誤差の
問題として把えられており、従ってこれらに対する対策
もそのような点からしか考えられていないので大きな解
決策とはなっていないというのが現状である。Until now, these shortcomings have been mainly understood as problems with the tooth shapes of the driven gear and drive gear and their tooth shape errors, and therefore, countermeasures for these problems have only been considered from that point of view, so there is no major solution. The current situation is that this is not the case.

（ハ）発明の開示 この発明は現状の回転ギセボンプにおける上記した騒音
および動力損失を低減せしめるべくドリブンギヤとドラ
イブギヤーの材質ならびにその重量低減について検討し
た結果、この発明に至ったものである。(C) Disclosure of the Invention This invention was developed as a result of studies on the materials of the driven gear and drive gear and on reducing their weight in order to reduce the noise and power loss described above in the current rotary gear pump.

以下この発明について詳述する。This invention will be explained in detail below.

第１図は回転ギヤポンプの一例として内接型トロコイド
歯形ポンプの平面図を示したものである。FIG. 1 shows a plan view of an internal trochoid tooth pump as an example of a rotary gear pump.

この回転ギヤポンプはドライブシャフト１によりドライ
ブギヤー（インナーローター）２が駆動され、その駆動
につれてドリブンギヤー（アウターローター）３が駆動
するのである。In this rotary gear pump, a drive gear (inner rotor) 2 is driven by a drive shaft 1, and a driven gear (outer rotor) 3 is driven as the drive gear (inner rotor) 2 is driven.

このドリブンギヤー３はポンプケース４内に作られたス
ペースに入っており、ドライブギヤー２、ドリブンギヤ
ー３の回転により流体が吸込口（図示せず）から吸いこ
まれ、吐出口より吐出される。This driven gear 3 is placed in a space created within a pump case 4, and as the drive gear 2 and driven gear 3 rotate, fluid is sucked in from a suction port (not shown) and discharged from a discharge port.

この運転状態において、ドライブギヤー２とドリブンギ
ヤー３の噛み合い時の衝突により、騒音が生じ、またポ
ンプ運転のための所要回転トルクも大きくなるのである
。In this operating state, noise is generated due to collision between the drive gear 2 and the driven gear 3 when they mesh, and the required rotational torque for pump operation also increases.

この発明は上記のような状態で生ずる騒音および動力損
失を改善するものであり、即ちこれをドリブンギヤ−３
自体の重量軽減によって解決せんとするものである。This invention aims to improve the noise and power loss that occur in the above-mentioned situation, that is, by reducing the noise and power loss caused by the driven gear 3.
The solution is to reduce the weight of the problem itself.

本発明者らの実験によれば、騒音レベルはドリブンギヤ
ーの重量にほぼ比例していることが確認された。According to experiments conducted by the present inventors, it has been confirmed that the noise level is approximately proportional to the weight of the driven gear.

従ってこのドリブンギヤーの重量軽減によって、歯形変
更あるいは歯形精度の向上など、従来行なわれてきてい
る対策に比べてはるかに大きな効果を得ることができる
のである。Therefore, by reducing the weight of the driven gear, it is possible to obtain much greater effects than conventional measures such as changing the tooth profile or improving tooth profile accuracy.

しかして、この発明においてドリブンギヤーの重量軽減
の具体策としては、 （１）従来の鉄系焼結合金を材料とする時は、形状的に
第２図（Ａ）の従来のドリブンギヤーに対して第２図（
Ｂ）のようにドリブンギヤー３の外周余肉部分５の肉取
り（除去）を行なうか、または第２図（Ｃ）に示すよう
に外周部分に複数の貫通孔６を設けることによって肉取
りすること。Therefore, in this invention, the specific measures for reducing the weight of the driven gear are as follows: (1) When using a conventional iron-based sintered alloy as a material, the shape is different from that of the conventional driven gear shown in Fig. 2 (A). Figure 2 (
The excess thickness 5 on the outer periphery of the driven gear 3 is removed (removed) as shown in B), or by providing a plurality of through holes 6 in the outer periphery as shown in FIG. 2(C). thing.

（２）　ドリブンギヤー３の材質としてアルミニウム等
の軽合金やセラミックスなど比重の小さな焼結合金材料
を用いること。(2) As the material of the driven gear 3, a light alloy such as aluminum or a sintered alloy material with low specific gravity such as ceramics should be used.

（３）　上記（１）あるいは（２）の材料にあらかじめ
テフロン、モリブデン等のコーティングを施してさらに
大きく騒音を減少させること。(3) The material of (1) or (2) above is coated with Teflon, molybdenum, etc. in advance to further reduce noise.

などを行なうものである。etc.

このようにしてドリブンギヤーの重量軽減をはかること
により騒音を低下せしめることができるのである。By reducing the weight of the driven gear in this way, noise can be reduced.

上記のうち焼結合金材料としてテフロン系やモリブデン
系のコーティングを表面に施したものは、この処理を施
さないものに比べて約１０％程度も騒音レベルをさらに
低減させることができるのである。Among the above-mentioned sintered alloy materials, those whose surfaces are coated with Teflon-based or molybdenum-based coatings can further reduce the noise level by about 10% compared to those without this treatment.

従ってアルミニウム等の軽合金やセラミックスなど材料
そのものを軽量化させたうえに、さらにその上に上記の
ようなコーティングを施せば騒音レベルは一段と低下改
善が可能となるのである。Therefore, by reducing the weight of the material itself, such as light alloys such as aluminum or ceramics, and then applying a coating as described above, it is possible to further reduce the noise level.

このようにこの発明のドリブンギヤーを用いることによ
り該ドリブンギヤーの軽量化によって■運転時の騒音レ
ベルの低下、■運転時の所要トルクの減少、■材料費低
減によるコストダウン、など大きなメリットを発揮する
ことができるのである。As described above, by using the driven gear of this invention, the weight of the driven gear is reduced, which brings about great benefits such as: - lower noise level during operation, - reduced torque required during operation, and - cost reduction due to lower material costs. It is possible.

なおアルミニウム等の軽合金やセラミックスなどの焼結
合金材料を使用する時は、鉄系焼結合金に比べてそれだ
けでもかなりの重［１減となって騒音も大きく改善でき
るので、該材料表面にテフロンやモリブデン等を施さな
くてもかまわない。Furthermore, when using sintered alloy materials such as light alloys such as aluminum or ceramics, it is necessary to reduce the weight by 1 compared to iron-based sintered alloys, which can greatly improve noise. There is no need to apply Teflon, molybdenum, etc.

以下この発明を実施例により詳述する。This invention will be explained in detail below using examples.

実施例 （１）外径がφ８８ｍｍ、肉厚９ｎ＋ｍ、り聞１３０２
の鉄系焼結合金よりなるドリブンギヤーにおいて、４０
００ｒｐｍで運転時の騒音は８０ｄＢであったものが、
（２）　第２図（Ｂ）のようにその外周部分を肉取りし
て重量を１１５牙にしたところ、４００Ｏｒｐｍで騒音
は７８ｄＢまで低下することが認められた。Example (1) Outer diameter is φ88mm, wall thickness is 9n+m, and the diameter is 1302mm.
In a driven gear made of iron-based sintered alloy, 40
Although the noise during operation at 00 rpm was 80 dB,
(2) When the outer periphery was thinned to make the weight 115 teeth as shown in FIG. 2(B), it was observed that the noise decreased to 78 dB at 400 rpm.

（３）　また（１）における鉄系焼結合金材料に代えて
アルミニウム焼結合金材料を用いたところ、その重量は
５０ｃ＃と一般と軽聞化され、騒音レベルは４０００ｒ
ｐｍで３５」と低下した。(3) Also, when an aluminum sintered alloy material was used instead of the iron-based sintered alloy material in (1), the weight was 50c#, which is considered common, and the noise level was 4000r
pm decreased to 35''.

＋４１　Ｆ２１および（３）の材料に対してその表面に
テフロン系、モリブデン系のコーティングを施したもの
を用いると、それらの場合よりもさらに約１０％程痕の
騒音レベル低下がはかれた。+41 When using F21 and (3) materials whose surfaces were coated with Teflon or molybdenum, the noise level was further reduced by about 10% compared to those cases.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は内接型トロコイド歯形ポンプの平面図、第２図
（Ａ）は従来のドリブンギヤの形状を示す平面図、第２
図（Ｂ）および（Ｃ）はこの発明になるドリブンギヤの
形状を示す平面図である。 ３・・・ドリブンギヤー　５・・・余肉部分６・・・貫
通孔 代　埋　人　弁理士　和　１）　昭 手続ネ…正書（自発） 昭和５９年２月２９日 昭和５８年特許願第２３５９０４号 ２、発明の名称 回転ギヤポンプ用ドリブンギヤー 住　所　大阪市東区北浜５丁目１５番地名　称　（２１
３）住友電気工業株式会社明細書の「特許請求の範囲」
の欄 特許請求の範囲 （１）回転ギヤポンプに用いる焼結合金材ｉ１１からな
るドリブンギヤーにおいて、鉄系焼結合金材料よりなる
ドリブンギヤーの外周余肉部を肉取りし−（該ドリブン
ギヤーの軽量化と運転時の騒音を低下せしめたことを特
徴どする回転ギヤポンプ用ドリブンギヤー。 （２）　ドリブンギヤーの外周余肉部の肉取りを該余肉
部の部分的な貫通孔形成によって行うことを特徴とする
特許請求の範囲第一１項記載の回転ギヤポンプ用ドリブ
ンギヤー。 （３）表面をテフロン系またはモリブデン系材料にてコ
ーティングした鉄系焼結合金材料を用いることを特徴と
する特許請求の範囲第１項記載の回転ギヤポンプ用ドリ
ブンギヤー。 （４）　回転ギＡ／ポンプに用いる焼結合金拐料からな
るドリブンギヤーにおいて、アルミ系軽合金、セラミッ
クス等の焼結合金月利を用いて該ドリブンギヤーの軽量
化と運転時の騒音を低下げしめたことを特徴とする回転
ギヤポンプ用ドリブンギヤー。 （５）　表面をテフロン系またはモリブデン系材１１＋
１にてコーティングしたアルミ系軽合金、セラミックス
等の焼結合金材料を用いることを特徴とする特許請求の
範囲第４項記載の回転ギヤポンプ用ドリブンギψ−０ 手続ネ…正１１　（自発） 昭和５９年９月１７日 特許庁長官　殿 回転ギヤポンプ用ドリブンギヤー （１）明細書の「発明の詳細な説明」の欄（２）図面 ６、補正の内容 別紙の通り 補正の内容 １．明細書第６頁１７行目〜第７頁１行目［なおアルミ
ニウム・・・・・・施さなくてもがまねない。」を削除
します。 ２、図面のうち第２図（Ｂ）を別紙の通り訂正します。 第２ｙＡ （Ｂ）Fig. 1 is a plan view of an internal trochoid tooth pump, Fig. 2 (A) is a plan view showing the shape of a conventional driven gear,
Figures (B) and (C) are plan views showing the shape of the driven gear according to the present invention. 3...Driven gear 5...Extra thickness 6...Through hole fee Filled by Kazu, Patent Attorney 1) Showa Proceedings Negotiations...Author (spontaneous) February 29, 1981 Patent Application No. 235904 No. 2, Name of the invention Driven gear for rotary gear pump Address 5-15 Kitahama, Higashi-ku, Osaka Name (21)
3) “Claims” of Sumitomo Electric Industries, Ltd. specification
Column Claims (1) In a driven gear made of a sintered metal material i11 used in a rotary gear pump, the excess thickness on the outer periphery of the driven gear made of an iron-based sintered metal material is removed (to reduce the weight of the driven gear). A driven gear for a rotary gear pump that is characterized by reduced noise during operation and reduced noise during operation. A driven gear for a rotary gear pump according to claim 11. (3) A driven gear for a rotary gear pump according to claim 11. (3) A driven gear for a rotary gear pump according to claim 11. Driven gear for a rotary gear pump according to scope 1. (4) In a driven gear made of a sintered alloy material used in the rotary gear A/pump, a sintered alloy material made of aluminum-based light alloy, ceramics, etc. is used. A driven gear for a rotary gear pump that is characterized by a lighter driven gear and lower noise during operation. (5) The surface is made of Teflon-based or molybdenum-based material 11+
Driven gear ψ-0 for a rotary gear pump according to claim 4, characterized in that a sintered alloy material such as an aluminum-based light alloy or ceramics coated with September 17, 2016 Director General of the Japan Patent Office Driven gear for rotary gear pumps (1) "Detailed Description of the Invention" section of the specification (2) Drawing 6, Contents of the Amendment Contents of the Amendment as shown in the attached sheet 1. Specification page 6, line 17 to page 7, line 1 [Aluminum...... may not be applied. ”. 2.Amend Figure 2 (B) of the drawings as shown in the attached sheet. 2nd yA (B)

Claims (4)

【特許請求の範囲】[Claims] （１）　回転ギヤポンプに用いる焼結合金材料からなる
ドリブンギヤーにおいて、鉄系焼結合金材料よりなるド
リブンギヤーの外周余肉部を肉取りして該ドリブンギヤ
ーの軽量化と運転時の騒音を低下せしめたことを特徴と
する回転ギヤポンプ用ドリブンギヤー。(1) In a driven gear made of a sintered alloy material used in a rotary gear pump, the excess thickness on the outer periphery of the driven gear made of an iron-based sintered alloy material is removed to reduce the weight of the driven gear and noise during operation. A driven gear for a rotary gear pump that is characterized by the following characteristics: （２）　ドリブンギヤーの外周余肉部の肉取りを該余肉
部の部分的な貫通孔形成によって行うことを特徴とする
特許請求の範囲第１項記載の回転ギヤポンプ用ドリブン
ギセ一二(2) The driven gear 12 for a rotary gear pump according to claim 1, wherein the excess thickness on the outer periphery of the driven gear is removed by partially forming a through hole in the excess thickness. （３）表面をテトロン系またはモリブデン系材料にてコ
ーティングした鉄系焼結合金材料を用いることを特徴と
する特許請求の範囲第１項記載の回転ギヤポンプ用ドリ
ブンギヤー。(3) The driven gear for a rotary gear pump according to claim 1, wherein the driven gear is made of an iron-based sintered alloy material whose surface is coated with a tetron-based or molybdenum-based material. （４）回転ギヤポンプに用いる焼結合金材料からなるド
リブンギヤーにおいて、アルミ系軽合金、セラミックス
等の焼結合金材料を用いて該ドリブンギヤーの軽量化と
運転時の騒音を低下せしめたことを特徴とする回転ギヤ
ポンプ用ドリブンギヤー。 （５１表面をテトロン系またはモリブデン系材料にてコ
ーティング１したアルミ系軽合金、セラミックス等の焼
結合金材料を用いることを特徴とする特許請求の範囲第
４項記載の回転ギヤポンプ用ドリブンギヤー。(4) A driven gear made of a sintered alloy material used in a rotary gear pump is characterized by using a sintered alloy material such as an aluminum light alloy or ceramics to reduce the weight of the driven gear and the noise during operation. Driven gear for rotary gear pump. (51) The driven gear for a rotary gear pump according to claim 4, characterized in that a sintered alloy material such as an aluminum-based light alloy or ceramics whose surface is coated with a tetron-based or molybdenum-based material is used.
JP23590483A 1983-12-13 1983-12-13 Driven gear for rotary gear pump Pending JPS60128983A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23590483A JPS60128983A (en) 1983-12-13 1983-12-13 Driven gear for rotary gear pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23590483A JPS60128983A (en) 1983-12-13 1983-12-13 Driven gear for rotary gear pump

Publications (1)

Publication Number Publication Date
JPS60128983A true JPS60128983A (en) 1985-07-10

Family

ID=16992953

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23590483A Pending JPS60128983A (en) 1983-12-13 1983-12-13 Driven gear for rotary gear pump

Country Status (1)

Country Link
JP (1) JPS60128983A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02169881A (en) * 1988-12-19 1990-06-29 Sumitomo Electric Ind Ltd Component for rotary gear pump
JPH0449680U (en) * 1990-08-30 1992-04-27
US5618171A (en) * 1994-01-21 1997-04-08 Cerasiv Gmbh Innovatives-Keramik-Engineering Supply unit with a ceramic internal gear pump
KR19980078907A (en) * 1997-04-30 1998-11-25 김영귀 Rotor structure of oil pump for automatic transmission
EP0907023A1 (en) 1997-10-03 1999-04-07 Sumitomo Electric Industries, Ltd. Sliding member made of sintered aluminum alloy and oil pump
US20100266435A1 (en) * 1998-07-31 2010-10-21 The Texas A&M University System Gerotor Apparatus for a Quasi-Isothermal Brayton Cycle Engine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02169881A (en) * 1988-12-19 1990-06-29 Sumitomo Electric Ind Ltd Component for rotary gear pump
JPH0449680U (en) * 1990-08-30 1992-04-27
US5618171A (en) * 1994-01-21 1997-04-08 Cerasiv Gmbh Innovatives-Keramik-Engineering Supply unit with a ceramic internal gear pump
KR19980078907A (en) * 1997-04-30 1998-11-25 김영귀 Rotor structure of oil pump for automatic transmission
EP0907023A1 (en) 1997-10-03 1999-04-07 Sumitomo Electric Industries, Ltd. Sliding member made of sintered aluminum alloy and oil pump
US6089843A (en) * 1997-10-03 2000-07-18 Sumitomo Electric Industries, Ltd. Sliding member and oil pump
US20100266435A1 (en) * 1998-07-31 2010-10-21 The Texas A&M University System Gerotor Apparatus for a Quasi-Isothermal Brayton Cycle Engine
US8821138B2 (en) * 1998-07-31 2014-09-02 The Texas A&M University System Gerotor apparatus for a quasi-isothermal Brayton cycle engine
US9382872B2 (en) 1998-07-31 2016-07-05 The Texas A&M University System Gerotor apparatus for a quasi-isothermal Brayton cycle engine

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