JPS63266101A - Side housing for rotary piston engine - Google Patents
Side housing for rotary piston engineInfo
- Publication number
- JPS63266101A JPS63266101A JP10028287A JP10028287A JPS63266101A JP S63266101 A JPS63266101 A JP S63266101A JP 10028287 A JP10028287 A JP 10028287A JP 10028287 A JP10028287 A JP 10028287A JP S63266101 A JPS63266101 A JP S63266101A
- Authority
- JP
- Japan
- Prior art keywords
- oxide film
- anodic oxide
- side housing
- cooling water
- water passage
- 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
Links
- 239000010407 anodic oxide Substances 0.000 claims abstract description 22
- 239000000498 cooling water Substances 0.000 claims abstract description 16
- 239000000919 ceramic Substances 0.000 claims abstract description 11
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000007751 thermal spraying Methods 0.000 abstract description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 1
- 238000011282 treatment Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 230000000873 masking effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、表面のロータシール部材の摺接部分に硬質の
セラミック層を形成して耐摩耗性を高めるようにしたア
ルミニウム合金製サイドハウジングの改良に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an aluminum alloy side housing in which a hard ceramic layer is formed on the sliding contact portion of a rotor seal member on the surface to improve wear resistance. Regarding improvements.
（従来技術及びその問題点）
従来から、ロータリエンジンの軽琶化を達成する為に、
ハウジングをアルミニウム合金により構成する方法が知
られている。しかし、アルミニウム合金は比較的軟質で
あるので、サイドハウジングを構成する場合には、ロー
タのシール部材とのＪｌ！！接部分の耐摩耗性を確保す
る為の対策が必要となる。この目的の為に、例えば実公
昭４６−２００８３号には、サイドハウジング内面の摩
耗率の高いシール部材との摺接部分に耐摩耗性に優れた
硬質の金属溶射層を形成するようにしている゛。(Prior art and its problems) Conventionally, in order to make the rotary engine lighter,
A method of constructing the housing from an aluminum alloy is known. However, since aluminum alloy is relatively soft, when configuring the side housing, Jl. ! Measures must be taken to ensure wear resistance of the contact parts. For this purpose, for example, in Japanese Utility Model Publication No. 46-20083, a hard metal sprayed layer with excellent wear resistance is formed on the inner surface of the side housing in sliding contact with the sealing member, which has a high wear rate.゛.
しかし、上記実公昭４６−２００８３号に開示されるよ
うなサイドハウジング内面のシールとの摺接部に硬質の
溶射層を形成する構造では、溶射層の表面があらすぎる
ためそのまま使用することはできず、表面あらさを緩和
するための一定の表面仕上げ処理が必要となる。また、
溶射層を形成するための硬質材料はハウジングの母材等
の他の材料に比して極めて高価であるので、溶射層は耐
摩耗性を要するシール摺接部分に限って形成することが
望ましい、このような事情を考慮して、シール摺接部分
に硬質の溶射層を形成し、次にこの溶射層をダイヤモン
ド砥石等を用いて表面仕上げを行うようにする方法が考
えられる。しかし、この方Ｊ：をアルミニウム合金製の
サイドハウジングに適用すると、砥石による溶射層の表
面仕上げの際、溶射層形成領域に隣接して露出している
軟質のアルミニウム合金母材の表面に砥石が当り、アル
ミニウム合金により砥石が目づまりを生じて砥石の作動
に悪影響が出たり、加工面にスクラッチが生じる等適正
な表面仕上げ処理が困難になるという問題が生じる。However, in the structure in which a hard sprayed layer is formed on the sliding contact area with the seal on the inner surface of the side housing as disclosed in the above-mentioned Japanese Utility Model Publication No. 46-20083, the surface of the sprayed layer is too rough and cannot be used as is. First, certain surface finishing treatments are required to reduce surface roughness. Also,
Since the hard material used to form the sprayed layer is extremely expensive compared to other materials such as the base material of the housing, it is desirable to form the sprayed layer only on the sliding contact area of the seal that requires wear resistance. Taking these circumstances into consideration, a method can be considered in which a hard sprayed layer is formed on the seal sliding contact area, and then the surface of this sprayed layer is finished using a diamond grindstone or the like. However, when this method J: is applied to an aluminum alloy side housing, when the surface of the sprayed layer is finished with a grinding wheel, the grinding wheel hits the exposed surface of the soft aluminum alloy base material adjacent to the sprayed layer forming area. The aluminum alloy causes problems such as clogging of the grinding wheel, which adversely affects the operation of the grinding wheel, and scratches on the machined surface, making it difficult to perform proper surface finishing.
そこで、シール部材の摺接部に溶射層を形成すると共に
、その他のハウジング部分に陽極酸化処理したものが提
案されている（特願昭６０−２４３１１１号）。Therefore, it has been proposed to form a sprayed layer on the sliding contact portion of the seal member and to anodize the other housing portions (Japanese Patent Application No. 60-243111).
これによれば、表面仕上げ処理の際に砥石のｔ」づまり
を防止でき適正な表面加工ができるようになる。According to this, it is possible to prevent the grindstone from clogging during surface finishing treatment, and to perform appropriate surface processing.
ところで、このものは摺接面を除き冷却水通路内壁を含
む全面に略均−の厚さの陽極酸化膜が形成されている。Incidentally, in this case, an anodic oxide film of approximately uniform thickness is formed on the entire surface including the inner wall of the cooling water passage except for the sliding surface.
この場合、陽極酸化膜の断熱作用によりエンジン冷間始
動時の暖機特性が向上するという効果があるものの、陽
極酸化膜をあまり薄くすると表面仕上げの際に母材のア
ルミが露出する惧れがある為膜厚が厚く（約ｘｏＯｐ）
、この為エンジン高速・高負荷領域では断熱作用が過剰
となりエンジ／の冷却性能が低下しオーバヒート現象が
起き易いという問題があった。In this case, the heat insulating effect of the anodic oxide film has the effect of improving warm-up characteristics during engine cold starting, but if the anodic oxide film is made too thin, there is a risk that the base material aluminum will be exposed during surface finishing. Because of this, the film thickness is thick (about xoOp)
For this reason, there is a problem in that in the engine high speed/high load region, the heat insulation effect becomes excessive, the cooling performance of the engine decreases, and overheating phenomenon easily occurs.
（発明の目的）
本発明は、上記の如き事情に鑑み、エンジン高負荷領域
の冷却性能を損なわず、しかも硬質セラミック層の表面
仕上げ加工性も良好なロータリピストンエンジンのサイ
ドハウジングの提供、をその目的とする。(Object of the Invention) In view of the above-mentioned circumstances, the present invention aims to provide a side housing for a rotary piston engine that does not impair the cooling performance in the high load region of the engine and also has a good surface finishing processability of the hard ceramic layer. purpose.
（発明の構成）
この為、本発明に係るロータリピストンエンジンのサイ
ドハウジングは、サイドハウジング内に形成される冷却
水通路内壁に厚さ２０μ〜５０μの陽極酸化膜を設け、
サイドハウジング表面のロータのシール部材が摺接する
摺接部に硬質セラミック層を設けると共に、摺接部に隣
接する表面部に、ハウジング表面の研磨加工前の厚さが
冷却水通路内壁の陽極酸化膜より厚い陽極酸化膜を設け
て構成されている。(Structure of the Invention) Therefore, the side housing of the rotary piston engine according to the present invention is provided with an anodized film having a thickness of 20 μm to 50 μm on the inner wall of the cooling water passage formed in the side housing.
A hard ceramic layer is provided on the sliding contact portion of the side housing surface where the rotor sealing member slides, and the anodized layer on the surface adjacent to the sliding contact portion is the same as the thickness of the inner wall of the cooling water passage before polishing of the housing surface. It is constructed with a thicker anodic oxide film.
上記の如く構成すると、冷却水通路内壁側の陽極酸化膜
が薄いのでエンジン高負荷領域の冷却性能の低下を防止
できると共に、セラミック層の表面研磨加工の際には、
母材のアルミニウムが露出することもなくなり適正な表
面仕上げを行えるようになる。With the above structure, since the anodic oxide film on the inner wall of the cooling water passage is thin, it is possible to prevent the cooling performance from deteriorating in the high load region of the engine, and when polishing the surface of the ceramic layer,
The base material aluminum is no longer exposed, making it possible to achieve a proper surface finish.
（発明の実施例）
第１図及２図示のサイドハウジングｌには、中心部に、
ロータ偏心軸が挿入される挿入穴２が形成されている。(Embodiment of the invention) The side housing l shown in FIGS. 1 and 2 has a
An insertion hole 2 into which the rotor eccentric shaft is inserted is formed.
この挿入穴２の周囲には、ロータハウジング３と一体で
ロータ４を収容するロータチャンバ５を形成するととも
に、ロータ４のシール部材に摺接する摺接面６が形成さ
れている。又、ハウジング１には、この摺接面６に開口
するようにサイド吸気ポート７が形成される。更に、摺
接面６の外側にはロータハウジング３との接合面８が設
けられ、該接合面８には冷却水を流通させる為の冷却水
通路９、テンションポルト挿通穴１０及び位置決めボル
ト挿通穴１１が夫々形成される。また、ロータハウジン
グ３には、排気ボート１２が形成されると共に２つの点
火プラグ１３．１４が挿入される。Around this insertion hole 2, a rotor chamber 5 that is integral with the rotor housing 3 and accommodates the rotor 4 is formed, and a sliding surface 6 that slides into contact with a sealing member of the rotor 4 is formed. Further, a side intake port 7 is formed in the housing 1 so as to open onto the sliding surface 6. Furthermore, a joint surface 8 with the rotor housing 3 is provided on the outside of the sliding surface 6, and the joint surface 8 has a cooling water passage 9 for circulating cooling water, a tension port insertion hole 10, and a positioning bolt insertion hole. 11 are formed respectively. Furthermore, an exhaust boat 12 is formed in the rotor housing 3, and two spark plugs 13, 14 are inserted therein.
そして、第３図に示すように冷却水通路９内壁には、厚
さ２０ル〜５０路の範囲で陽極酸化膜２１を形成し、摺
接面６には、例えばクロムカーバイド（Ｃｒ３Ｇ２−２
５ Ｎ１Ｃｒ）の溶射により硬質のセラミ−／り層２２
を形成し、更に、摺接面６に隣接する接合面８に、研磨
加工後、前記陽極酸化Ｉｔ！２２１と略同等の厚さを有
する陽極酸化膜２３を形成しである。As shown in FIG. 3, an anodic oxide film 21 is formed on the inner wall of the cooling water passage 9 to a thickness of 20 to 50 mm, and the sliding surface 6 is coated with, for example, chromium carbide (Cr3G2-2).
5 N1Cr) hard ceramic/layer 22 by thermal spraying.
Furthermore, after polishing, the anodic oxidation It! is applied to the bonding surface 8 adjacent to the sliding surface 6. An anodic oxide film 23 having substantially the same thickness as 221 is formed.
次に、このサイトハウジングの製造工程につい述べる。Next, the manufacturing process of this site housing will be described.
アルミニウム合金（ＡＣ４ＡＴ６）で成形したサイドハ
ウジング１の摺接面６及び接合面８に耐酸性マスキング
塗料を塗布してｌ？ｌ接面６及び接合面８のマスキング
を行った後に、第１の陽極耐化処理（冷却水通路９に対
する）を行なう。処理条件としては、浴組成１５ｖａ１
％硫酸、浴温度−５℃、電流密度１．５Ａ／ｄ■２゜処
理時間３０分とし厚さ約２０島の陽極酸化膜２１を形成
する。Apply acid-resistant masking paint to the sliding surface 6 and joint surface 8 of the side housing 1 made of aluminum alloy (AC4AT6). After masking the contact surface 6 and the joint surface 8, a first anodic resistance treatment (for the cooling water passage 9) is performed. The treatment conditions include a bath composition of 15 val.
% sulfuric acid, a bath temperature of -5 DEG C., a current density of 1.5 A/d2 DEG and a processing time of 30 minutes to form an anodic oxide film 21 having a thickness of about 20 islands.
次に陽極酸化膜２１の電気絶縁性及び耐食性を高めるた
めに、沸騰水（蒸留水）中に約３０分侵漬することによ
り封孔処理する。尚、この際に熱によりマスキング塗料
も同時に除去される。Next, in order to improve the electrical insulation and corrosion resistance of the anodic oxide film 21, it is sealed by immersing it in boiling water (distilled water) for about 30 minutes. Incidentally, at this time, the masking paint is also removed by heat at the same time.
そして第２の陽極酸化処理を行い摺動面６及び接面８に
加工性改Ｈのための陽極酸化膜２３を形成する。処理条
件は第１の陽極酸化処理と同じであるが処理時間は約２
．５時間として厚さ７０μ〜１５０ｐＬ、好ましくは約
ｉｏ。Then, a second anodic oxidation treatment is performed to form an anodic oxide film 23 on the sliding surface 6 and the contact surface 8 for improving workability. The treatment conditions are the same as the first anodization treatment, but the treatment time is approximately 2
．． 70 μ to 150 pL thickness for 5 hours, preferably about io.
井程度の陽極酸化膜２３を形成する。An anodic oxide film 23 of about the same size as a well is formed.
次に、摺動面６のみを約２００ｇの深さに研削処理する
。そして、形成された四部を脱脂し、次にショツトブラ
ストをかけた後、プラズマ溶射機（メチコン社製、？１
ＩＩＢ型装置）でＧｒａＣｚ−２５ＮｉＣｒの溶射材料
を溶射して摺接面６に約２５０終の厚さのセラミック層
２２を形成する。Next, only the sliding surface 6 is ground to a depth of about 200 g. Then, after degreasing the formed four parts and then shot blasting, a plasma spraying machine (manufactured by Methicon, ?1
A ceramic layer 22 having a thickness of about 250 mm is formed on the sliding contact surface 6 by thermal spraying a thermal spray material of GraCz-25NiCr using a type IIB apparatus.
次に２粗研削用、精密研削用の２種類のダイヤモンド砥
石（日立製、粗密平面研削盤、５ＤＣ２０ＯＮ７５ＢＷ
４ 及び５ＤＣ７００）１７５ＢＷ４ ）を用イテ粗
研削及び精密研削を行い１５０μ厚さのセラミック層２
２に仕上げた。この場合、ローターハウジング３との接
合面８の陽極酸化膜は、約５０、研削して摺接面６と面
一になるよう仕上げた。Next, two types of diamond grinding wheels for rough grinding and precision grinding (manufactured by Hitachi, coarse and fine surface grinder, 5DC20ON75BW)
4 and 5DC700) 175BW4) was used for rough grinding and precision grinding to form a ceramic layer 2 with a thickness of 150μ.
I finished it in 2. In this case, the anodic oxide film on the joint surface 8 with the rotor housing 3 was ground by about 50 mm to make it flush with the sliding surface 6.
この研削処理において使用したダイヤモンド砥石に目づ
まり等の支障は全く生じず、又、仕上面もスクラ２・千
等の発生はなく極めて良好であった。The diamond grindstone used in this grinding process did not cause any problems such as clogging, and the finished surface was extremely good with no scratches or the like.
第４及５図には、エンジン性能について従来と本発明と
の比較を示しである。FIGS. 4 and 5 show a comparison between the conventional engine performance and the present invention in terms of engine performance.
第４図は、エンジン回転数と出力との関係。Figure 4 shows the relationship between engine speed and output.
第５図は平均有効圧と燃費率との関係を夫々示したもの
であり、これから明らかなように本発明のもの（図中実
線で示す）は、従来のもの（図中点線で示す）に比べて
高速・高負荷領域において優れている。尚、従来のもの
の冷却水通路内壁の陽極酸化膜の厚さは１００ｐとした
。Figure 5 shows the relationship between average effective pressure and fuel efficiency, and as is clear from this, the product of the present invention (indicated by the solid line in the figure) is superior to the conventional one (indicated by the dotted line in the figure). It is superior in high speed and high load areas. In addition, the thickness of the anodic oxide film on the inner wall of the cooling water passage in the conventional one was 100p.
（発明の効果）
上記の如き、本発明に係るロータリピストンエンジンの
サイドハウジングによれば、冷却水通路内壁の陽極酸化
１模の厚さを２０ｇ〜５０舊と％、％ｉ＜したので、エ
ンジン高速・高負荷領域でのエンジン性能を向丘できる
と共に、研磨加工前の接合面の陽極酸化膜を厚くしたの
で、セラミック層の表面仕上げ処理も砥石に［１づまり
等を）１ユじることなく良好に出来る。(Effects of the Invention) According to the side housing of the rotary piston engine according to the present invention as described above, the thickness of the anodized layer on the inner wall of the cooling water passage is set to 20 g to 50 g, %, %i<, so that the engine In addition to improving engine performance at high speeds and high loads, the anodic oxide film on the joint surface before polishing is thickened, so surface finishing of the ceramic layer can be done without any damage to the grindstone (such as jamming). It can be done well.
【図面の簡単な説明】
第１図は本発す１の一実施例を示すサイドハウジングの
詳細図、第２図は同上サイドハウジングを使用するロー
タリピストンエンジンの断面図、ｔｊＳ３図は同上サイ
ドハウジングの断面図、第４及５図は夫々本発明と従来
とのエンジン性能の比較を示す図である。
１・・・サイトハウジング
６・・・摺接面 ８・・・接合面９・・・冷却水
通路
２１．２３・・・陽極酸化膜
２２・・・セラミック層[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a detailed view of a side housing showing one embodiment of the present invention, Fig. 2 is a sectional view of a rotary piston engine using the same side housing, and Fig. The sectional view and FIGS. 4 and 5 are diagrams showing a comparison of engine performance between the present invention and the conventional engine. 1... Site housing 6... Sliding surface 8... Joint surface 9... Cooling water passage 21.23... Anodic oxide film 22... Ceramic layer
Claims (1)
ハウジングにおいて、サイドハウジング内に形成される
冷却水通路内壁に厚さ ２０〜５０μの陽極酸化膜を設け、サイドハウジング表
面のロータのシール部材が摺接する摺接部に硬質セラミ
ック層を設けると共に、前記摺接部に隣接する表面部に
、ハウジング表面の研磨加工前の厚さが冷却水通路内壁
の陽極酸化膜よりも厚い陽極酸化膜を設けたことを特徴
とするロータリエンジンのサイドハウジング。[Claims] In an aluminum alloy side housing for a rotary piston engine, an anodized film with a thickness of 20 to 50 μm is provided on the inner wall of the cooling water passage formed in the side housing, and the rotor sealing member on the surface of the side housing is A hard ceramic layer is provided on the sliding contact portion, and an anodic oxide film is provided on the surface portion adjacent to the sliding contact portion, the thickness of which is thicker before polishing of the housing surface than the anodic oxide film on the inner wall of the cooling water passage. The side housing of a rotary engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10028287A JPS63266101A (en) | 1987-04-23 | 1987-04-23 | Side housing for rotary piston engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10028287A JPS63266101A (en) | 1987-04-23 | 1987-04-23 | Side housing for rotary piston engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63266101A true JPS63266101A (en) | 1988-11-02 |
Family
ID=14269839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10028287A Pending JPS63266101A (en) | 1987-04-23 | 1987-04-23 | Side housing for rotary piston engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63266101A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5073387A (en) * | 1990-01-24 | 1991-12-17 | Lafayette Applied Chemistry, Inc. | Method for preparing reduced calorie foods |
| WO2000014396A1 (en) * | 1998-09-04 | 2000-03-16 | Tadashi Yoshida | Adiabatic internal combustion engine |
| EP1048676A2 (en) † | 1999-04-28 | 2000-11-02 | Rohm And Haas Company | Polymer compositions |
| RU182138U1 (en) * | 2018-02-22 | 2018-08-03 | Федеральное государственное унитарное предприятие "Центральный институт авиационного моторостроения им. П.И. Баранова" | Housing of a rotary piston internal combustion engine |
-
1987
- 1987-04-23 JP JP10028287A patent/JPS63266101A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5073387A (en) * | 1990-01-24 | 1991-12-17 | Lafayette Applied Chemistry, Inc. | Method for preparing reduced calorie foods |
| WO2000014396A1 (en) * | 1998-09-04 | 2000-03-16 | Tadashi Yoshida | Adiabatic internal combustion engine |
| EP1048676A2 (en) † | 1999-04-28 | 2000-11-02 | Rohm And Haas Company | Polymer compositions |
| EP1048676B2 (en) † | 1999-04-28 | 2009-07-22 | Rohm And Haas Company | Polymer compositions |
| RU182138U1 (en) * | 2018-02-22 | 2018-08-03 | Федеральное государственное унитарное предприятие "Центральный институт авиационного моторостроения им. П.И. Баранова" | Housing of a rotary piston internal combustion engine |
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