JP2645261B2 - Screw rotor - Google Patents

Screw rotor

Info

Publication number
JP2645261B2
JP2645261B2 JP13147988A JP13147988A JP2645261B2 JP 2645261 B2 JP2645261 B2 JP 2645261B2 JP 13147988 A JP13147988 A JP 13147988A JP 13147988 A JP13147988 A JP 13147988A JP 2645261 B2 JP2645261 B2 JP 2645261B2
Authority
JP
Japan
Prior art keywords
rotor
screw
metal shaft
synthetic resin
screw rotor
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.)
Expired - Lifetime
Application number
JP13147988A
Other languages
Japanese (ja)
Other versions
JPH01301976A (en
Inventor
悟 後藤
里見 村田
博 藤村
一光 西岡
真澄 関田
英夫 黒田
Original Assignee
ブラザー工業株式会社
三菱重工業株式会社
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 ブラザー工業株式会社, 三菱重工業株式会社 filed Critical ブラザー工業株式会社
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

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection 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
    • B29C45/14311Injection 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08Rotary-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
    • F04C18/082Details specially related to intermeshing engagement type pumps
    • F04C18/084Toothed wheels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/08Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers

Description

Description: TECHNICAL FIELD The present invention relates to a helical gear, a worm screw, and particularly to a screw rotor suitable for a screw rotor of a screw compressor or a pump.

(Conventional technology and its problems) The conventional screw rotor of a screw type compressor is manufactured by machining a high-strength steel material such as carbon steel for machine structural use. It was precisely cut with a single cutter or bob.

Therefore, this screw rotor not only requires a large number of man-hours for processing the screw, but also has a large variation in accuracy due to a cutting error.

In addition, since the screw rotor is entirely made of a steel material, its weight is large and, therefore, its inertia at the time of rotation is large, so that a large power is required for starting the screw rotor.

Therefore, in order to reduce the weight of the screw rotor, for example, as shown in JP-A-59-32688, a synthetic resin having a screw on the outer peripheral surface by injection molding so as to cover a metal shaft made of a synthetic resin. It has been proposed to integrate a resin rotor with a metal shaft.

In this screw rotor, since the synthetic resin rotor is joined to the metal shaft only by the fixing force at the time of injection molding, when the screw rotor is removed from the molding die while twisting or when the screw type compressor is operated, When a load is applied to the screw on the outer periphery of the rotor, the rotor may be detached from the shaft.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and an object of the present invention is to prevent a synthetic resin rotor from separating from a metal shaft. It is in.

In order to achieve this object, according to the present invention, in a screw rotor formed by injection molding a synthetic resin rotor on a metal shaft so as to cover the metal shaft, the metal shaft is covered by the rotor. One or more grooves or projections having a lead angle opposite to the direction of the lead angle of the rotor are engraved on the surface of the portion to be formed.

(Function) In the present invention, since the above-mentioned configuration is provided, the synthetic resin is formed so as to enclose the protrusions or the protrusions formed in the grooves formed on the surface of the metal shaft at the time of injection molding into the synthetic resin rotor. To cure. Since the groove or the projection is twisted in the direction opposite to the twisting direction of the screw, the synthetic resin which has entered the groove or has been set so as to enclose the projection twists the synthetic resin rotor and the metal shaft relatively. It exerts a large drag against the force acting in the direction.

(Embodiment) FIGS. 1 to 4 show an embodiment in which the present invention is applied to a male screw rotor of a screw compressor.

1 to 4, the male screw rotor 1
Consists of a metal shaft 2 and a synthetic resin rotor 3 covering the shaft.

The synthetic resin rotor 3 is formed on the metal shaft 2 by injection molding, and has four threads on its outer peripheral surface. On the surface of the metal shaft 2, four grooves 4 having a lead angle opposite to the direction of the lead angle of the rotor are engraved over the entire length of the portion covered by the rotor 3. The groove 4 shown has a rectangular cross section,
It is engraved over the entire length of the portion covered by the rotor 3, but the cross-sectional shape, the number, the lead angle, and the engraving range of the groove 4 can be arbitrarily selected.

At the time of injection molding of the synthetic resin rotor 3, the synthetic resin enters the groove 4 formed on the surface of the metal shaft 2 and hardens.

After the injection molding, the screw rotor 1 is extracted from the inside of the mold while rotating in the torsion direction of the screw. During operation of the screw compressor, the male screw rotor 1 is rotated at high speed while meshing with the female screw rotor in the casing.

Since the groove 4 is twisted in the direction opposite to the twisting direction of the screw, the hardened synthetic resin entering the groove 4 is synthesized when the screw rotor 1 is removed from the molding die or when the screw compressor is operated. A large drag is exerted against a force acting in a direction in which the resin rotor and the metal shaft are relatively twisted.

As described above, the example in which the groove having the lead angle opposite to the direction of the lead angle of the rotor is engraved has been described. However, instead of this groove, a projection may be engraved. Is hardened so as to enclose it, and exerts a large resistance to the force in the direction of relatively twisting the rotor and the metal shaft similarly to the groove.

(Effect of the Invention) In the present invention, in a screw rotor formed by injection molding a synthetic resin rotor on a metal shaft so as to cover the metal shaft, the metal shaft is covered with the rotor. Since one or more grooves or projections having a lead angle opposite to the direction of the lead angle of the rotor are engraved on the surface of the portion, the grooves or projections are engraved on the surface of the metal shaft during injection molding of synthetic resin. The synthetic resin that has been hardened so as to enter the groove or envelop the projections exerts a large resistance against the force that uses the direction in which the synthetic resin rotor and the metal shaft are relatively twisted, and the synthetic resin rotor is used. Effectively prevents detachment from the metal shaft.

In addition, since it is sufficient to engrave the surface of the metal shaft, the processing is easier and less expensive than when D-cut or low-red processing is performed, and there is no risk of deforming the metal shaft during processing. In addition, the resistance to the torsional force acting on the synthetic resin rotor also increases.

[Brief description of the drawings]

1 to 4 show an embodiment in which the present invention is applied to a screw rotor. The upper half of FIG. 1 shows a vertical section, and the lower half shows a front view. 2 is a cross-sectional view taken along the line II-II of 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 of FIG. Screw rotor 1. Metal shaft 2. Synthetic resin rotor 3. Groove 4.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoru Goto 9-35, Horita-dori, Mizuho-ku, Nagoya-shi, Aichi Prefecture Inside Brother Industries, Ltd. (72) Inventor Hideo Kuroda Character road Iwasuka-cho, Nakamura-ku, Nagoya-shi, Aichi 1st place: Nagoya Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Masumi Sekida 3-chome, Asahimachi, Nishibiwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture 1-1, Air Conditioning Works of Mitsubishi Heavy Industries, Ltd. (72) Inventor Kazumitsu Nishioka, Aichi Pref. 3-1-1, Asahicho, Nishi-Biwajima-cho, Gunsai Mitsubishi Heavy Industries, Ltd. Air Conditioner Works (56) References Special Table 62-502278

Claims (1)

(57) [Claims]
1. A screw rotor formed by injection-molding a synthetic resin rotor on a metal shaft so as to cover the metal shaft, wherein the metal shaft is provided on the surface of a portion covered by the rotor. A screw rotor characterized in that one or more grooves or projections having a lead angle opposite to the direction of the lead angle of the rotor are engraved.
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 JPH01301976A (en) 1989-12-06
JP2645261B2 true 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8308463B2 (en) 2006-09-28 2012-11-13 Kabushiki Kaisha Kobe Seiko Sho Resin screw rotor molded to a metallic shaft

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2550802Y2 (en) * 1989-08-30 1997-10-15 石川島播磨重工業株式会社 Rotor for screw compressor
FR2724990B1 (en) * 1994-09-28 1996-12-13 Valeo Systemes Dessuyage Support plate for a wiper device
US5865239A (en) * 1997-02-05 1999-02-02 Micropump, Inc. Method for making herringbone gears
US6139298A (en) * 1998-07-08 2000-10-31 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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPH01301976A (en) 1989-12-06

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