JPH01301976A - Screw rotor - Google Patents

Screw rotor

Info

Publication number
JPH01301976A
JPH01301976A JP13147988A JP13147988A JPH01301976A JP H01301976 A JPH01301976 A JP H01301976A JP 13147988 A JP13147988 A JP 13147988A JP 13147988 A JP13147988 A JP 13147988A JP H01301976 A JPH01301976 A JP H01301976A
Authority
JP
Japan
Prior art keywords
rotor
synthetic resin
screw
metal shaft
grooves
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.)
Granted
Application number
JP13147988A
Other languages
Japanese (ja)
Other versions
JP2645261B2 (en
Inventor
Hiroshi Fujimura
藤村　博
Satomi Murata
村田　里見
Satoru Goto
悟 後藤
Hideo Kuroda
英夫 黒田
Masumi Sekida
真澄 関田
Kazumitsu Nishioka
西岡　一光
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.)
Brother Industries Ltd
Mitsubishi Heavy Industries Ltd
Original Assignee
Brother Industries Ltd
Mitsubishi Heavy 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 Brother Industries Ltd, Mitsubishi Heavy Industries Ltd filed Critical Brother Industries Ltd
Priority to JP13147988A priority Critical patent/JP2645261B2/en
Publication of JPH01301976A publication Critical patent/JPH01301976A/en
Application granted granted Critical
Publication of JP2645261B2 publication Critical patent/JP2645261B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14311—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/082—Details specially related to intermeshing engagement type pumps
    • F04C18/084—Toothed wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Gears, Cams (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To exhibit a large resistance against a force acting in a swing direction by engraving grooves or forming protrusions, on a metallic shaft, for including lead angles opposing to the lead angle possessed by a rotor. CONSTITUTION:A male screw rotor 1 comprises a metallic shaft 2 and a synthetic resin made rotor 3 for covering the shaft 2. The synthetic resin made rotor 3 is formed on the metallic shaft 2 by injection molding and equipped with 4 lines of screw on its periphery. Four lines of grooves 4 having lead angles opposite to the direction of the lead angles possessed by the rotor 3 engraved along the total length of the portion to be covered by the rotor 3 are engraved on the surface of the metallic shaft 2. When the synthetic resin made rotor 3 is under the process of injection molding, the synthetic resin enters the grooves 4 engraved on the surface of the metallic shaft 2 and hardens there.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明はへりカルギヤ、ウオームねし、特に、スクリュ
ー型圧縮機又はポンプのスクリューロータに好適なスク
リューロータに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a helical gear, a worm gear, and particularly a screw rotor suitable for a screw rotor of a screw compressor or a pump.

（従来の技術及びその課題） 従来のスクリュー型圧縮機のスクリューロータは機械構
造用炭素鋼等の高強度鉄綱材料を機械加工することによ
って製造されており、特に、そのスクリューは専用の加
工機械を用いてシングルカッタ又はホブ等により精密に
切削加工されていた。(Prior art and its problems) The screw rotor of a conventional screw compressor is manufactured by machining high-strength steel materials such as carbon steel for machine structures, and in particular, the screw is manufactured using a special processing machine. It was precisely cut using a single cutter or hob.

従って、このスクリューロータはスクリューの加工に多
大の工数を必要とするのみならず切削誤差による精度の
ばらつきが大きい。Therefore, this screw rotor not only requires a large number of man-hours to process the screw, but also has large variations in accuracy due to cutting errors.

また、このスクリューロータはその全体が鉄鋼材料から
なるので、その重量が大きく、従って、その回転時の慣
性が大きいためスクリューロータの起動に大きな動力を
必要とする。Furthermore, since this screw rotor is entirely made of steel, it is heavy and therefore has a large inertia during rotation, requiring a large amount of power to start the screw rotor.

そこで、スクリューロータの重量を低減するため、例え
ば、特開昭５９−３２６８８号公報に示されるように、
合成樹脂を金属製シャフトを被覆するように射出成形す
ることによって外周面にねじを有する合成樹脂製ロータ
を金属製シャフトと一体化することが提案された。Therefore, in order to reduce the weight of the screw rotor, for example, as shown in Japanese Patent Application Laid-Open No. 59-32688,
It has been proposed to integrate a synthetic resin rotor with threads on the outer peripheral surface with a metal shaft by injection molding a synthetic resin to cover the metal shaft.

このスクリューロータにおいては、合成樹脂製ロータは
その射出成形時の固着力のみによって金属製シャフトに
接合しているため、スクリューロータを成形型から捩り
ながら取り出すとき又はこのスクリュー型圧縮機の運転
時にロータの外周のねじに負荷が作用したとき、ロータ
がシャフトから離脱するおそれがあった。In this screw rotor, the synthetic resin rotor is joined to the metal shaft only by the adhesion force during injection molding, so when the screw rotor is twisted out of the mold or when this screw compressor is operated, the rotor When a load was applied to the screws on the outer periphery of the rotor, there was a risk that the rotor would separate from the shaft.

（課題を解決するための手段） 本発明は上記課題を解決するためになされたものであっ
て、その目的とするところは、合成樹脂製ロータが金属
製シャフトから離脱するのを■止しようとするにある。(Means for Solving the Problems) The present invention has been made to solve the above problems, and its purpose is to prevent the synthetic resin rotor from separating from the metal shaft. There is something to do.

この目的を達成するため、本発明においては、合成樹脂
製ロータを金属製シャフト上にこれを被覆するように射
出成形することによって形成してなるスクリューロータ
において、上記金属製シャフトが上記ロータによって被
覆される部分の表面に上記ロータの有するリード角の方
向と逆方向のリード角を持った単数あるいは複数個の溝
又は突起を刻設している。In order to achieve this object, the present invention provides a screw rotor formed by injection molding a synthetic resin rotor onto a metal shaft so as to cover the rotor, wherein the metal shaft is covered with the rotor. One or more grooves or protrusions having a lead angle opposite to the direction of the lead angle of the rotor are carved on the surface of the portion where the rotor is formed.

（作用） 本発明においては、上記構成を具えているため、合成樹
脂製ロータの射出成形時、合成樹脂が金属製シャフトの
表面に刻設された溝内に入っであるいは突起を包みこむ
ように硬化する。そして、この溝又は突起はねじの捩れ
方向と反対方向に涙れているので、この溝内に入って又
は突起を包みこむように硬化した合成樹脂は合成樹脂製
ロータと金属製シャフトを相対的に捩る方向に作用する
力に対して大きな抗力を発揮する。(Function) Since the present invention has the above-mentioned configuration, during injection molding of the synthetic resin rotor, the synthetic resin hardens by entering into the grooves carved on the surface of the metal shaft or wrapping around the protrusions. do. Since this groove or protrusion runs in the opposite direction to the twisting direction of the screw, the synthetic resin that hardens into the groove or wraps around the protrusion will cause the synthetic resin rotor and metal shaft to move relative to each other. It exerts a large resistance against forces acting in the twisting direction.

（実施例） 本発明をスクリュー型圧縮機の雄スクリユーロータに適
用したｌ実施例が第１図ないし第４図に示されている。(Embodiment) An embodiment in which the present invention is applied to a male screw rotor of a screw compressor is shown in FIGS. 1 to 4.

第１図ないし第４回において、雄スクリユーロータ１は
金属製シャフト２とこれを被覆する合成樹脂製ロータ３
からなる。In Figures 1 to 4, a male screw rotor 1 includes a metal shaft 2 and a synthetic resin rotor 3 covering the metal shaft 2.
Consisting of

合成樹脂製ロータ３は射出成形によって金属製シャフト
２上に形成され、その外周面に４条のねじを具えている
。金属製シャフト２の表面には上記ロータ３によって被
覆される部分の全長に亘って上記ロータの有するリード
角の方向と逆方向のリード角を持った４本の慣４が刻設
されている。The synthetic resin rotor 3 is formed on the metal shaft 2 by injection molding, and has four threads on its outer peripheral surface. Four grooves 4 having lead angles opposite to the direction of the lead angle of the rotor are carved on the surface of the metal shaft 2 over the entire length of the portion covered by the rotor 3.

なお、図示のａ４は断面形状が方形で、ロータ３によっ
て被覆される部分の全長に亘って刻設されているが、溝
４の断面形状、本数、リード角、刻設範囲は任意に選定
できる。Note that a4 shown in the figure has a rectangular cross-sectional shape and is carved over the entire length of the portion covered by the rotor 3, but the cross-sectional shape, number, lead angle, and carved range of the grooves 4 can be arbitrarily selected. .

合成樹脂製ロータ３の射出成形時、合成樹脂が金属製シ
ャフト２の表面に刻設された溝４内に入って硬化する。During injection molding of the synthetic resin rotor 3, the synthetic resin enters the grooves 4 carved on the surface of the metal shaft 2 and hardens.

そして、このスクリューロータ１は射出成形後、成形型
内からねしの候れ方向に回転させながら抜き取られる。After injection molding, the screw rotor 1 is removed from the mold while being rotated in the direction of the molding.

また、スクリュー型圧縮機の運転時、この雄スクリユー
ロータ１はケーシング内で雌スクリユーロータと噛合し
ながら高速で回転される。When the screw compressor is in operation, the male screw rotor 1 is rotated at high speed while meshing with the female screw rotor within the casing.

しかして、溝４はねじの鎖れ方向と反対方向に捩れてい
るので、この溝４内に入って硬化した合成樹脂はスクリ
ューロータ１を成形型から抜き取る際やスクリュー型圧
縮機の運転時等合成樹脂製ロータと金属製シャフトとを
相対的に捩る方向に作用する力に対して大きな抗力を発
揮する。Since the groove 4 is twisted in the opposite direction to the chaining direction of the screw, the synthetic resin that has entered the groove 4 and hardened may be removed when the screw rotor 1 is removed from the mold or when the screw compressor is operated. It exerts a large resistance against the force that acts in a direction that twists the synthetic resin rotor and the metal shaft relative to each other.

以上、ロータの有するリード角の方向と逆方向のリード
角を持った溝を刻設した例について説明したが、この溝
に代えて突起を刻設してもよく、この場合は合成樹脂は
突起を包みこむように硬化し、溝と同様ロータと金属製
シャフトを相対的に捩じる方向の力に対して大きな抗力
を発揮する。Above, we have explained an example in which a groove is carved with a lead angle opposite to the direction of the lead angle of the rotor, but instead of this groove, a protrusion may be carved, and in this case, the synthetic resin has a protrusion. It hardens in a way that envelops the metal shaft, and, like the grooves, exerts a large resistance against forces that twist the rotor and metal shaft relative to each other.

（発明の効果） 本発明においては、合成樹脂製ロータを金属製シャフト
上にこれを被覆するように射出成形することによって形
成してなるスクリューロータにおいて、上記金属製シャ
フトが上記ロータによって被覆される部分の表面に上記
ロータの有するリード角の方向と逆方向のリード角を持
った単数あるいは複数個の溝又は突起を刻設したため、
合成樹脂の射出成形時に金属製シャフトの表面に刻設さ
れた溝内に入って又は突起を包みこむように硬化した合
成樹脂は合成樹脂製ロータと金属製シャフトを相対的に
捩じる方向に作用する力に対して大きな抗力を発揮して
合成樹脂製ロータが金属製シャフトから離脱するのを効
果的に防止する。(Effects of the Invention) In the present invention, in a screw rotor formed by injection molding a synthetic resin rotor onto a metal shaft so as to cover the rotor, the metal shaft is covered by the rotor. Because one or more grooves or protrusions with a lead angle opposite to the direction of the lead angle of the rotor are carved on the surface of the part,
During synthetic resin injection molding, the synthetic resin hardens by entering the grooves carved into the surface of the metal shaft or surrounding the protrusions, and acts in a direction that twists the synthetic resin rotor and the metal shaft relative to each other. This effectively prevents the synthetic resin rotor from separating from the metal shaft by exerting a large resistance force against the force exerted by the synthetic resin rotor.

また、金属製シャフトの表面を刻設すれば足りるので、
Ｄカ・７トやローレット加工を施す場合に比しその加工
が容易、かつ、安価であるのみならず加工時に金属製シ
ャフトを変形させるおそれもなく、また、合成樹脂製ロ
ータに作用する捩れ方向の力に対する抗力も大きくなる
。Also, since it is sufficient to engrave the surface of the metal shaft,
Not only is the processing easier and cheaper than D-shaped or knurling, there is no risk of deforming the metal shaft during processing, and the torsion direction that acts on the synthetic resin rotor is The resistance to the force of will also increase.

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

第１図ないし第４図は本発明をスクリューロータに適用
した１実施例を示し、第１図の上半は縦断面を、下半ば
正面を示す。第２図は第１図の■−ｎ線に沿う横断面図
、第３図は金属製シャフトの正面図、第４図は第３図の
ＩＶ−ＩＶ線に沿う横断面図である。 スクリューローター１、金属製シャフト−・−２、合第
１図1 to 4 show an embodiment in which the present invention is applied to a screw rotor, with the upper half of FIG. 1 showing a longitudinal section and the lower half showing a front view. 2 is a cross-sectional view taken along the line ■-n in FIG. 1, FIG. 3 is a front view of the metal shaft, and FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. 3. Screw rotor 1, metal shaft--2, combined Figure 1

Claims (1)

【特許請求の範囲】[Claims] 合成樹脂製ロータを金属製シャフト上にこれを被覆する
ように射出成形することによって形成してなるスクリュ
ーロータにおいて、上記金属製シャフトが上記ロータに
よって被覆される部分の表面に上記ロータの有するリー
ド角の方向と逆方向のリード角を持った単数あるいは複
数個の溝又は突起を刻設したことを特徴とするスクリュ
ーロータ。In a screw rotor formed by injection molding a synthetic resin rotor onto a metal shaft so as to cover it, a lead angle of the rotor is formed on the surface of the portion of the metal shaft covered by the rotor. 1. A screw rotor characterized by having one or more grooves or protrusions carved therein having a lead angle opposite to the direction of.
JP13147988A 1988-05-31 1988-05-31 Screw rotor Expired - Lifetime JP2645261B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13147988A JP2645261B2 (en) 1988-05-31 1988-05-31 Screw rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13147988A JP2645261B2 (en) 1988-05-31 1988-05-31 Screw rotor

Publications (2)

Publication Number Publication Date
JPH01301976A true JPH01301976A (en) 1989-12-06
JP2645261B2 JP2645261B2 (en) 1997-08-25

Family

ID=15058939

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13147988A Expired - Lifetime JP2645261B2 (en) 1988-05-31 1988-05-31 Screw rotor

Country Status (1)

Country Link
JP (1) JP2645261B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0342083U (en) * 1989-08-30 1991-04-22
FR2724990A1 (en) * 1994-09-28 1996-03-29 Valeo Systemes Dessuyage SUPPORT PLATE FOR A WIPER DEVICE
US6139298A (en) * 1998-07-08 2000-10-31 Hokuetsu Industries Co., Ltd. Shaft structure in screw rotor of screw fluid assembly
FR2855565A1 (en) * 1997-02-05 2004-12-03 Micropump Inc GEAR PUMP WITH CHEVRON TEETH
JP2006348919A (en) * 2005-06-20 2006-12-28 Yamada Seisakusho Co Ltd Rotor device for pump
US8308463B2 (en) * 2006-09-28 2012-11-13 Kabushiki Kaisha Kobe Seiko Sho Resin screw rotor molded to a metallic shaft

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0342083U (en) * 1989-08-30 1991-04-22
FR2724990A1 (en) * 1994-09-28 1996-03-29 Valeo Systemes Dessuyage SUPPORT PLATE FOR A WIPER DEVICE
EP0704356A1 (en) * 1994-09-28 1996-04-03 Valeo Systemes D'essuyage Support frame for a windscreen-wiper mechanism
FR2855565A1 (en) * 1997-02-05 2004-12-03 Micropump Inc GEAR PUMP WITH CHEVRON TEETH
US6139298A (en) * 1998-07-08 2000-10-31 Hokuetsu Industries Co., Ltd. Shaft structure in screw rotor of screw fluid assembly
US6186756B1 (en) 1998-07-08 2001-02-13 Hokuetsu Industries Co., Ltd. Shaft structure in screw rotor of screw fluid assembly
JP2006348919A (en) * 2005-06-20 2006-12-28 Yamada Seisakusho Co Ltd Rotor device for pump
US8308463B2 (en) * 2006-09-28 2012-11-13 Kabushiki Kaisha Kobe Seiko Sho Resin screw rotor molded to a metallic shaft

Also Published As

Publication number Publication date
JP2645261B2 (en) 1997-08-25

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