DE2712719A1 - INJECTION MOLDED SPUR WHEEL MADE OF THERMOPLASTIC PLASTIC - Google Patents

INJECTION MOLDED SPUR WHEEL MADE OF THERMOPLASTIC PLASTIC

Info

Publication number
DE2712719A1
DE2712719A1 DE19772712719 DE2712719A DE2712719A1 DE 2712719 A1 DE2712719 A1 DE 2712719A1 DE 19772712719 DE19772712719 DE 19772712719 DE 2712719 A DE2712719 A DE 2712719A DE 2712719 A1 DE2712719 A1 DE 2712719A1
Authority
DE
Germany
Prior art keywords
spur gear
width
injection molded
thermoplastic plastic
injection
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
DE19772712719
Other languages
German (de)
Inventor
Werner Ing Grad Friedrich
Vinzenz Haberzett
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.)
Scheubeck GmbH and Co
Original Assignee
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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 Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG filed Critical Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
Priority to DE19772712719 priority Critical patent/DE2712719A1/en
Priority to JP3180978A priority patent/JPS53137359A/en
Priority to FR7808541A priority patent/FR2385006A1/en
Publication of DE2712719A1 publication Critical patent/DE2712719A1/en
Pending 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
    • B29C45/14819—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 the inserts being completely encapsulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • 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
    • B29L2015/00—Gear wheels or similar articles with grooves or projections, e.g. control knobs
    • B29L2015/003—Gears

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Gears, Cams (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

Maschinenfabrik Reinhausen Regensburg, den 21 Gebrüder Scheubeck GmbH & Co KG 219Ma/Gl RegensburgMaschinenfabrik Reinhausen Regensburg, 21 Gebrüder Scheubeck GmbH & Co KG 219Ma / Gl regensburg

Spritzgegossenes Stirnrad aus thermoplastischen Kunststoff S injection-molded spur gear made of thermoplastic material

Die Erfindung bezieht sich auf ein spritzgegossenes Stirnrad, wie es im Oberbegriff des Anspruches 1 näher bezeichnet ist.The invention relates to an injection-molded spur gear as described in more detail in the preamble of claim 1.

Es ist bekannt, die Zähne von Zahnrädern breitenballig auszuführen, d.h. die Zähne werden an den Stirnseiten dünner als in der Zahnmitte ausgebildet. Mit derartigen Zähnen werden sogenannte Kantenträger vermieden, es erfolgt ein definierter Kraftangriff beim Abwälzen, was wiederum die Dauerfestigkeit der Zahnräder erhöht. Auch laufen derartig ausgebildete Zahnräder geräuscharm. Allerdings ist die Herstellung der Breitenballigkeit sehr aufwendig. Läßt sich die Breitenballigkeit z.B. bei spritzgegossenen Kegelrädern noch durch entsprechendes Ausarbeiten der Form erzielen, so ist dies bei spritzgegossenen Stirnrädern nicht möglich, da das Stirnrad nicht mehr aus dem Werkzeug entformt werden könnte.It is known to design the teeth of gears with broad crowns, i.e. the teeth are made thinner on the end faces than in the center of the teeth. With such teeth, so-called edge carriers are avoided, there is a defined force application when Rolling, which in turn increases the fatigue strength of the gears. Gearwheels designed in this way also run with little noise. However the production of the crowning is very complex. Can the crowning be measured e.g. in the case of injection-molded bevel gears can still be achieved by appropriately working out the shape, this is not possible with injection-molded spur gears because the spur gear could no longer be removed from the mold.

Aufgabe der Erfindung ist es, ein spritzgegossenes Stirnrad aus thermoplastischen Kunststoff mit breitenballigen Zähnen anzugeben, das einfach und billig herzustellen ist. Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Patentanspruches 1 angegebenen Mittel gelöst.The object of the invention is to provide an injection-molded spur gear made of thermoplastic material with broad-crowned teeth, that is easy and cheap to manufacture. This object is achieved according to the invention solved by the means specified in the characterizing part of claim 1.

Die Erfindung macht sich hierbei eine Eigenschaft des Kunststoffes zu Nutzen, die darin liegt, daß der thermoplastische Kunststoff beim Erkalten ein starkes Schrumpfverhalten besitzt. Dieses Schrumpfen des thermoplastischen Kunststoffes kann bis zu einigen Prozenten seines ursprünglichen Volumens betragen. Durcfi den erfindungsgemäß eingespritzten Metallring wird nun das Schrumpfen des Kunststoffes so gesteuert, daß die Stirnseiten der Zähne mehr zur Nabe hin schrumpfen, während die Zahnmitte sich beim Schrumpfvorgang am*Metallring staut. Hierdurch entsteht die gewünschte Breitenballigkeit.The invention makes this a property of the plastic to benefit, which is that the thermoplastic material has a strong shrinkage behavior when it cools. This shrinking of the thermoplastic material can be up to a few percent of its original volume. Performed according to the invention injected metal ring, the shrinkage of the plastic is now controlled so that the front sides of the teeth shrink more towards the hub, while the center of the tooth accumulates on the * metal ring during the shrinking process. This creates the desired crowning shape.

8098 3 9/^)348098 3 9 / ^) 34

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung
dargestellt und wird im folgenden näher beschrieben:An embodiment of the invention is shown in the drawing
and is described in more detail below:

Der Stirnradkörper 1 besitzt ein Nabenteil 2 sowie ein die Zähne 3 tragendes verstärkt ausgeführtes äußeres Teil 4. In diesem äußeren Teil 4 ist ein Metallring 5 eingespritzt, dessen äußerer Radius 6
nur wenig kleiner ist als der Fußkreis 7 des Stirnrades. Die
Breite b des Metallringes 5 ist etwa halb so groß wie die Breite B des Zahnkranzes. Das verstärkte Schrumpfverhalten des Kunststoffes um den Metallring herum ist durch Pfeile angedeutet. Je nach dem
Verhältnis der Breite B der Verzahnung zur Breite b des Metallringes läßt sich eine unterschiedliche Breitenballigkeit erzielen.The spur gear body 1 has a hub part 2 and a reinforced outer part 4 carrying the teeth 3. In this outer part 4, a metal ring 5 is injected, the outer radius 6 of which
is only slightly smaller than the root circle 7 of the spur gear. the
Width b of the metal ring 5 is about half as large as the width B of the ring gear. The increased shrinkage behavior of the plastic around the metal ring is indicated by arrows. Depending on
The ratio of the width B of the toothing to the width b of the metal ring can be used to achieve a different crowning.

809839/03^7809839/03 ^ 7

e e r s e tiee e r s e tie

Claims (1)

PatentansprücheClaims (1. Spritzgegossenes Stirnrad aus thermoplastischen Kunststoff mit breitenballig geformten Zähnen, dadurch gekennzeichnet, daß im Stirnradkörper (1) mittig zur Verzahnung (3) ein die Schrumpfung des Kunststoffes steuernder Metallring (5) eingespritzt ist, dessen Außendurchmesser (6) nur wenig kleiner ist als der Fußkreis (7) des Stirnrades und dessen Breite (b) kleiner als die Zahnbreite (B) ist.(1. Injection-molded spur gear made of thermoplastic material with broad-crowned teeth, thereby characterized in that in the spur gear body (1) in the middle of the toothing (3) a shrinkage of the plastic control metal ring (5) is injected, the outer diameter (6) of which is only slightly smaller than the base circle (7) of the spur gear and its width (b) is smaller than the face width (B). Spritzgegossenes Stirnrad nach Anspruch 1, dadurch gekennzeichnet, daß sich die Breite (B) der Verzahnung (3) zur Breite (b) des Metallringes (5) etwa verhält wie 2:1.Injection-molded spur gear according to Claim 1, characterized in that the width (B) is the The toothing (3) to the width (b) of the metal ring (5) is roughly 2: 1. 809839/0347809839/0347
DE19772712719 1977-03-23 1977-03-23 INJECTION MOLDED SPUR WHEEL MADE OF THERMOPLASTIC PLASTIC Pending DE2712719A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19772712719 DE2712719A1 (en) 1977-03-23 1977-03-23 INJECTION MOLDED SPUR WHEEL MADE OF THERMOPLASTIC PLASTIC
JP3180978A JPS53137359A (en) 1977-03-23 1978-03-22 Injection molded spur gear of thermoplastic synthetic resin
FR7808541A FR2385006A1 (en) 1977-03-23 1978-03-23 Thermoplastics injection-moulded spur gear with bulging teeth - has embedded metal ring to control shrinkage of moulding compound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772712719 DE2712719A1 (en) 1977-03-23 1977-03-23 INJECTION MOLDED SPUR WHEEL MADE OF THERMOPLASTIC PLASTIC

Publications (1)

Publication Number Publication Date
DE2712719A1 true DE2712719A1 (en) 1978-09-28

Family

ID=6004424

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19772712719 Pending DE2712719A1 (en) 1977-03-23 1977-03-23 INJECTION MOLDED SPUR WHEEL MADE OF THERMOPLASTIC PLASTIC

Country Status (3)

Country Link
JP (1) JPS53137359A (en)
DE (1) DE2712719A1 (en)
FR (1) FR2385006A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332146A (en) * 1980-11-24 1982-06-01 Hitachi, Ltd. Drive force transmitting device for ice-making tray of automatic ice-making machine
US5852951A (en) * 1994-10-04 1998-12-29 Briggs & Stratton Corporation Composite gear and method of making same
CN109228208A (en) * 2018-09-20 2019-01-18 昆山弘正电子科技有限公司 The injection mold of router base and the Shooting Technique of router base

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2487772B1 (en) * 1980-08-04 1987-01-09 Haubtmann A Sa Ets MONOBLOCK ASSEMBLY COMPRISING AT LEAST ONE TRAY WITH OR WITHOUT CHAIN PROTECTOR FOR CRIMPING ON HANDLES, USEFUL FOR BICYCLES AND SIMILAR VEHICLES, AND MANUFACTURING METHOD THEREOF
FR3021576B1 (en) * 2014-06-03 2016-06-24 Jtekt Europe Sas METHOD FOR MANUFACTURING A WHEEL WITH REINFORCING STRAP

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332146A (en) * 1980-11-24 1982-06-01 Hitachi, Ltd. Drive force transmitting device for ice-making tray of automatic ice-making machine
US5852951A (en) * 1994-10-04 1998-12-29 Briggs & Stratton Corporation Composite gear and method of making same
US6014808A (en) * 1994-10-04 2000-01-18 Briggs & Stratton Corporation Method of making a composite gear
US6064027A (en) * 1994-10-04 2000-05-16 Briggs & Stratton Corporation Method of making a composite gear
US6077063A (en) * 1994-10-04 2000-06-20 Briggs & Stratton Corporation Tool for making a composite gear
CN109228208A (en) * 2018-09-20 2019-01-18 昆山弘正电子科技有限公司 The injection mold of router base and the Shooting Technique of router base

Also Published As

Publication number Publication date
JPS53137359A (en) 1978-11-30
FR2385006A1 (en) 1978-10-20

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