US20070087617A1 - Gearwheel and method for manufacturing a gearwheel - Google Patents

Gearwheel and method for manufacturing a gearwheel Download PDF

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Publication number
US20070087617A1
US20070087617A1 US11/582,555 US58255506A US2007087617A1 US 20070087617 A1 US20070087617 A1 US 20070087617A1 US 58255506 A US58255506 A US 58255506A US 2007087617 A1 US2007087617 A1 US 2007087617A1
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US
United States
Prior art keywords
insert
gearwheel
external part
connecting part
external
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.)
Abandoned
Application number
US11/582,555
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English (en)
Inventor
Stephan Oberle
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.)
IMS Gear SE and Co KGaA
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Individual
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 Individual filed Critical Individual
Assigned to IMS GEAR GMBH reassignment IMS GEAR GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OBERLE, STEPHAN
Assigned to IMS GEAR GMBH reassignment IMS GEAR GMBH RE-RECORD TO CORRECT THE ADDRESS OF THE ASSIGNEE, PREVIOUSLY RECORDED ON REEL 018614 FRAME 0812. Assignors: OBERLE, STEPHAN
Publication of US20070087617A1 publication Critical patent/US20070087617A1/en
Priority to US12/766,477 priority Critical patent/US8795569B2/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • F16H2055/065—Moulded gears, e.g. inserts therefor

Definitions

  • the invention concerns a gearwheel with the generic characteristics of claim 1 and a method for manufacturing a gearwheel with the generic characteristics of claim 6 .
  • EPAS Electric Power Assisted Steering
  • gearwheels are of the prior art.
  • Such gearwheels consist of a molded polyamide ring that is bonded to a large metal hub.
  • a gear rim with machine-milled teeth is then formed on the outside of the molded polyamide ring.
  • gearwheels in which a large steel hub is surrounded by injection molding are of the prior art.
  • a large steel hub or metal hub refers to a hub that is larger than half of the diameter of the gearwheel formed in such a manner.
  • gearwheels with an external part having an actual gear rim on the outer surface, and with an insert that is formed in particular as a large metal hub are of the prior art.
  • the connection is made either by these two components mechanically engaging with each another or by means of a connecting part in the manner of an intermediate ring placed between them, which is inserted between them to form a form-fitting connection between the external part and the insert.
  • Gear tooth structures located on the exterior and interior sides of the ring-shaped connecting part serve to create the form-fitting connection, since they are shaped so as to attach to corresponding opposing structures on the interior side of the external part or on the exterior side of the insert.
  • the connecting part is made of plastic, albeit relatively rigid plastic because of the required stiffness, such geared structures must be very small in the case of a snap-fastened connection in order that the components can be inserted into one another.
  • the injection-molded plastic for the gearing formed on the exterior of the external part is hindered in its ability to shrink freely. This places the plastic ring under permanent tensile stress.
  • a large insert [used] as an insert part also causes greatly reduced shrinkage stress in such a case. Shrinkage stresses are tensile stresses and increase the effective tooth root stress of the torque transfer, thus reducing tooth flank strength.
  • a small insert means that a greater proportion of plastic is required.
  • Non-reinforced plastic has very temperature-dependent mechanical properties, however. A higher proportion of plastic thus means that dimensions change greatly when the ambient temperature changes.
  • a high proportion of plastic also means highly unreliable deformation at greater driving torque, which affects the external gear rim.
  • a small metal hub as an insert means poor torque transfer between the metal hub and an external plastic gear rim.
  • the objective of the invention is to provide a gearwheel with a simple structure whose individual components are also well attached. Accordingly, a method for manufacturing a gearwheel shall also be proposed that permits the production of such a gearwheel.
  • a gearwheel with an external part, an insert, and a connecting part creating a form-fitting connection between the external part and the insert is preferred, wherein at least one connecting part is made from a material that is molded between the external part and the insert.
  • connecting part permits counter-gripping structures, which offer particularly firm engagement to oppose rotational forces and forces parallel to the axis due to a deep penetration into the external part and the insert. This permits counter-gripping structures that penetrate deeper into the external part and the insert than is possible with conventional individual components, which are inserted into one another based upon their specific manufacture.
  • the preferred embodiment is a design in which the insert is made of metal and the external part is made of plastic, and the connecting part is made of an injection molding material containing plastic.
  • the connecting part can be made from a harder material and/or more torque-proof material than a material of the external part; this permits a more stable connection between the two circumjacent parts.
  • the connecting part preferably with gear tooth structures that prevent pulling in the rotational direction and/or in a direction parallel to the axis, engages with the insert and/or the external part, which creates good rotational stability and/or stability against shifting parallel to the axis for the insert and the external part relative to one another.
  • the connecting part is preferably molded with a cone gate between the external part and the insert. This prevents transitional areas [from forming] between plastic quantities that flow together in a rotational and/or radial direction in a typical injection molding procedure. The result is increased stability, especially in the rotational and/or radial direction.
  • the external part is preferably provided with external teeth and the insert is provided with external gear tooth structures.
  • the connecting part is preferably molded from an axially parallel direction particularly as a cone mold between the external part and the insert. A lateral cone gate is then simply removed.
  • the connecting part is preferably molded under pressure that exerts outward force on the external part, so that after the molding material cools, the external part is under a desired, adjustable level of stress, particularly stress-free.
  • the connecting part is preferably molded from a reinforced plastic.
  • a steel hub In contrast to a traditional solution method for creating a two-component gearwheel, in which a steel hub is placed into a tool, a wheel body is injection molded around it, and then a gear rim is injection molded, which results in highly restricted shrinkage stresses on the gear rim, [here] a steel hub especially advantageously [used] as the insert and a separately injection molded, particularly thinner gear rim, preferably made from non-reinforced plastic, are placed into an injection molding tool, whereupon the intervening space is injected with reinforced plastic.
  • a special advantage is that instead of a known shrinkage of the gear rim through contraction and the creation of corresponding shrinkage stresses by the injection pressure, the gear rim is elastically elongated externally when the connecting part is injection molded, with the gear rim preferably resting on a wall of the surrounding tool.
  • the injection molded wheel body then shrinks onto the particularly small steel hub.
  • the gear rim that was elastically elongated during the injection molding contracts once again.
  • the elongation can preferably be calculated so that the gear rim is nearly stress-free when cool.
  • connection between gear rim and wheel body is preferably made by means of form closure, e.g. by in-mold lamination, and/or an adhesive bond, for example in the form of a surface fusing, e.g. of the gear rim made from reinforced polyamide with wheel body casts made from fiber-reinforced polyamide.
  • the gear rim can also be brought under compressive stress if necessary, which creates a higher tooth root capacity.
  • a high-quality, temperature-consistent gear rim material e.g. Peek
  • the inexpensive wheel body material can also be combined with the inexpensive wheel body material. This can result in reduced heat expansion because the gear rim can be made thin and constitutes only a small portion of the entire body of the gearwheel.
  • FIG. 1 A section through a gearwheel
  • FIG. 2 Three separate individual components of such a gearwheel in a lateral sectional view
  • FIG. 3 Three separate individual components of such a gearwheel in a perspective sectional view
  • FIG. 4 Two separate initial individual components of such a gearwheel in a lateral sectional view during an initial manufacturing step
  • FIG. 5 The two individual components according to FIG. 4 connected by means of injected material in a lateral sectional view during a second manufacturing step and in a perspective lateral view after this second manufacturing step;
  • FIG. 6 Two views of a gearwheel manufactured in this manner in a lateral sectional view after a final manufacturing step.
  • an exemplary gearwheel 1 consists of several individual components, wherein a gearwheel 1 consisting of three components is shown as an example.
  • Gearwheel 1 has an external part 2 on the outside that forms the actual gear rim. This external part 2 is preferably very thin or does not extend very far.
  • Gearwheel 1 has an insert 3 on the inside, typically an insert 3 that is in the form of a hub. Whereas the external part 2 is preferably made from a relatively soft plastic material, which is typical for gearwheels, the insert 3 is preferably in the form of a metal hub, for example a metal hub, which is also typical.
  • the external circumference of the insert 3 is spatially removed from the internal circumference of the external part 2 , so that the one can be loosely inserted into the other in a tool.
  • the insert 3 is connected to the external part 2 by means of a connecting part 4 used to create a form-fitting connection between the external part 2 and the insert 3 .
  • the connecting part 4 is molded between the external part 2 and the insert 3 so that the connecting part of the finished gearwheel 1 is formed from a molded material.
  • the external part and the insert can also be connected by interposing other, particularly ring-shaped, elements, then followed by several similarly molded connecting parts.
  • a gearwheel is especially preferred which has only a single connecting part, as opposed to many connecting parts, between a single insert and a single external part.
  • both the inside and outside of the connecting part 4 preferably have gear tooth structures 42 and 43 that engage the corresponding gear tooth structures 32 and 23 of the insert 3 and/or the external part 2 .
  • the gear tooth structures 32 , 42 , 23 , and 43 are preferably formed so as to create a connection between the external part 2 , the connecting part 4 , and the insert 3 that is both non-rotating as well as fixed in the axial and radial directions of a rotation axis X.
  • FIGS. 4 through 6 provide exemplary descriptions of a manufacturing process for manufacturing such a gearwheel 1 .
  • the same reference numbers as in the other figures, especially FIGS. 1 through 3 refer to the same or similarly acting components or functional characteristics, so that reference is made in this regard to other sections of the specification.
  • FIG. 4 shows an initial manufacturing step in which the external part 2 and the insert 3 located within it are arranged on a supporting surface 50 of a tool 5 in their desired relative positions.
  • the external part 2 and the insert 3 are set in a fixed position relative to one another with the aid of the tool 5 .
  • the external part 2 in particular can be surrounded by a circumferential wall (not shown) that can exert pressure on the outside of the external part 2 to counteract any injection molding pressure on the inside.
  • a tool upper part 51 is attached to this arrangement from the top so that plastic injected through an injection molding channel 52 fills the space between the insert 3 and the external part 2 with the molded material, as shown in FIG. 5 .
  • a tool insert 53 is placed into the open space of the insert 3 before injection and in particular before the tool upper part 51 is placed on top.
  • Such an injection molding procedure from the side seen from axial direction X creates a gearwheel with a lateral cone gate 46 that extends in the form of a cone from the side wall of the gearwheel and the formed connecting part up to the sprue part 45 .
  • the cone mold allows the material to be injected into the intermediate space between the insert 3 and the external part 2 without forming transitions in the circumferential or rotational direction of the subsequent gearwheel as a result of material that has run together. Seams acting as break-off points are thus avoided, and thus stability is optimized in the rotational and radial direction.
  • the cone gate 46 formed in this manner is removed, e.g. cut off or removed by machining, so that ultimately a gearwheel 1 as shown in FIG. 6 is formed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Gears, Cams (AREA)
  • Gear Transmission (AREA)
US11/582,555 2005-10-19 2006-10-18 Gearwheel and method for manufacturing a gearwheel Abandoned US20070087617A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/766,477 US8795569B2 (en) 2005-10-19 2010-04-23 Method for manufacturing a gearwheel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005050439.6 2005-10-19
DE102005050439 2005-10-19

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/766,477 Division US8795569B2 (en) 2005-10-19 2010-04-23 Method for manufacturing a gearwheel

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US20070087617A1 true US20070087617A1 (en) 2007-04-19

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US11/582,555 Abandoned US20070087617A1 (en) 2005-10-19 2006-10-18 Gearwheel and method for manufacturing a gearwheel
US12/766,477 Active US8795569B2 (en) 2005-10-19 2010-04-23 Method for manufacturing a gearwheel

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Country Status (6)

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US (2) US20070087617A1 (zh)
EP (1) EP1777439B1 (zh)
CN (1) CN100578043C (zh)
AT (1) ATE491903T1 (zh)
DE (1) DE502006008499D1 (zh)
ES (1) ES2354369T3 (zh)

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US20120000307A1 (en) * 2009-03-17 2012-01-05 Quadrant Epp Ag Composite gear blank and method for manufacturing same
US20150345615A1 (en) * 2014-05-28 2015-12-03 Skf Lubrication Systems Germany Gmbh Lubrication pinion module, lubrication pinion, and method for manufacturing a lubrication pinion module
EP3078706A1 (en) 2015-04-08 2016-10-12 Jtekt Corporation Sliding member, method of manufacturing sliding member, and gear
US20190093748A1 (en) * 2017-09-25 2019-03-28 Ims Gear Se & Co. Kgaa Spur gear for use in a spur gear unit, gearwheel pair for a spur gear unit, spur gear unit having such a gearwheel pair, and method for producing a spur gear and its use in spur gear units
CN114945761A (zh) * 2020-01-15 2022-08-26 Ｋｙｂ株式会社 齿轮的制造方法以及齿轮
US11680632B2 (en) * 2019-10-01 2023-06-20 Ims Gear Se & Co. Kgaa Gear ring carrier part for a two- or multi-component gear and two- or multi-component gear with such a gear ring carrier part

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KR101091067B1 (ko) * 2011-02-18 2011-12-08 주식회사 광덕에이앤티 기어 휠 및 기어 휠의 제조방법
DE102011051386A1 (de) * 2011-06-28 2013-01-03 Zf Lenksysteme Gmbh Verfahren zur Herstellung eines Zahnrades
DE102011079423A1 (de) 2011-07-19 2013-01-24 Zf Friedrichshafen Ag Verbund-Zahnrad
ITMI20112336A1 (it) * 2011-12-21 2013-06-22 Amer Spa Componente meccanico e metodo per la realizzazione di detto componente meccanico
KR101346347B1 (ko) * 2012-02-13 2013-12-31 남양공업주식회사 Ｍｄｐｓ 웜휠 및 제조방법
DE102012102776A1 (de) 2012-03-30 2013-10-02 Zf Lenksysteme Gmbh Schraubrad für eine elektromechanische lenkvorrichtung
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DE102012102777B4 (de) 2012-03-30 2019-08-14 Robert Bosch Automotive Steering Gmbh Schraubrad für eine elektromechanische lenkvorrichtung
DE102012102778A1 (de) 2012-03-30 2013-10-02 Zf Lenksysteme Gmbh Verfahren zum herstellen eines schraubrads
DE102012102775B4 (de) 2012-03-30 2020-10-22 Robert Bosch Gmbh Schraubrad für eine elektromechanische Lenkvorrichtung
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EP2899430B1 (de) 2014-01-23 2017-10-25 IMS Gear SE & Co. KGaA Mehrkomponentenzahnrad
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JP6610413B2 (ja) * 2016-04-26 2019-11-27 中西金属工業株式会社 インサート成形品の製造方法
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DE102017131180A1 (de) * 2017-12-22 2019-06-27 Thyssenkrupp Ag Schneckenrad für ein Schneckenradgetriebe einer Kraftfahrzeuglenkung mit einem eingespritzten Trägerring
DE102017131173A1 (de) * 2017-12-22 2019-06-27 Thyssenkrupp Ag Schneckenrad für ein Schneckenradgetriebe einer Kraftfahrzeuglenkung mit einem zwischen einer Nabe und einem Zahnkranz eingespritzten Trägerring
DE102018205006A1 (de) 2018-04-04 2019-10-10 Robert Bosch Gmbh Zahnrad
CN108858907B (zh) * 2018-06-25 2023-11-07 英瑟泰科精密注塑（苏州）有限公司 汽车进气阀门半齿产品的吸料模具及其吸料模块的加工工艺
CN109854709B (zh) * 2018-12-19 2024-04-09 博世华域转向系统有限公司 一种eps齿轮
CN110005783A (zh) * 2019-04-19 2019-07-12 浙江美亚特精密机械有限公司 一种复合式金属/树脂齿轮及其制造工艺和用途
CN110030364A (zh) * 2019-04-19 2019-07-19 浙江美亚特精密机械有限公司 一种多层式金属/树脂齿轮及其制造工艺和用途
DE102019210668A1 (de) * 2019-07-18 2021-01-21 Robert Bosch Gmbh Lenkgetriebe mit mehrteiligem Zahnrad aus Kunststoff, das mittels Laserdurchstrahlschweißens hergestellt wird
EP3789635B1 (de) 2019-09-03 2022-06-01 IMS Gear SE & Co. KGaA Zahnrad
WO2021045493A1 (ko) * 2019-09-03 2021-03-11 주식회사 만도 조향장치 감속기의 웜휠 및 이의 제조방법
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US20120000307A1 (en) * 2009-03-17 2012-01-05 Quadrant Epp Ag Composite gear blank and method for manufacturing same
US9205611B2 (en) * 2009-03-17 2015-12-08 Quadrant Epp Ag Composite gear blank
US20150345615A1 (en) * 2014-05-28 2015-12-03 Skf Lubrication Systems Germany Gmbh Lubrication pinion module, lubrication pinion, and method for manufacturing a lubrication pinion module
US9816602B2 (en) * 2014-05-28 2017-11-14 Skf Lubrication Systems Germany Gmbh Lubrication pinion module, lubrication pinion, and method for manufacturing a lubrication pinion module
EP3078706A1 (en) 2015-04-08 2016-10-12 Jtekt Corporation Sliding member, method of manufacturing sliding member, and gear
US9896637B2 (en) 2015-04-08 2018-02-20 Jtekt Corporation Sliding member, method of manufacturing sliding member, and gear
US20190093748A1 (en) * 2017-09-25 2019-03-28 Ims Gear Se & Co. Kgaa Spur gear for use in a spur gear unit, gearwheel pair for a spur gear unit, spur gear unit having such a gearwheel pair, and method for producing a spur gear and its use in spur gear units
KR20210080315A (ko) * 2017-09-25 2021-06-30 이엠에스 기어 에스에 운트 코. 카케아아 스퍼 기어 유닛에 사용되는 스퍼 기어, 스퍼 기어 유닛용 기어 휠 쌍, 이러한 기어 쌍을 구비한 스퍼 기어 유닛, 및 스퍼 기어의 제조 방법 및 이의 스퍼 기어 유닛에서의 사용
US11754164B2 (en) * 2017-09-25 2023-09-12 Ims Gear Se & Co. Kgaa Gear, gearwheel pair, and method for producing a gear
KR102592864B1 (ko) * 2017-09-25 2023-10-23 이엠에스 기어 에스에 운트 코. 카케아아 스퍼 기어 유닛에 사용되는 스퍼 기어, 스퍼 기어 유닛용 기어 휠 쌍, 이러한 기어 쌍을 구비한 스퍼 기어 유닛, 및 스퍼 기어의 제조 방법 및 이의 스퍼 기어 유닛에서의 사용
US11680632B2 (en) * 2019-10-01 2023-06-20 Ims Gear Se & Co. Kgaa Gear ring carrier part for a two- or multi-component gear and two- or multi-component gear with such a gear ring carrier part
CN114945761A (zh) * 2020-01-15 2022-08-26 Ｋｙｂ株式会社 齿轮的制造方法以及齿轮
US20230058996A1 (en) * 2020-01-15 2023-02-23 Kyb Corporation Gear manufacturing method and gear
US11959538B2 (en) * 2020-01-15 2024-04-16 Kyb Corporation Gear manufacturing method and gear

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EP1777439B1 (de) 2010-12-15
US20100201030A1 (en) 2010-08-12
EP1777439A1 (de) 2007-04-25
ATE491903T1 (de) 2011-01-15
CN101016944A (zh) 2007-08-15
ES2354369T3 (es) 2011-03-14
DE502006008499D1 (de) 2011-01-27
US8795569B2 (en) 2014-08-05
CN100578043C (zh) 2010-01-06

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