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WO2018206169A1 - Procédé de fabrication d'une roue dentée - Google Patents

Procédé de fabrication d'une roue dentée Download PDF

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Publication number
WO2018206169A1
WO2018206169A1 PCT/EP2018/054408 EP2018054408W WO2018206169A1 WO 2018206169 A1 WO2018206169 A1 WO 2018206169A1 EP 2018054408 W EP2018054408 W EP 2018054408W WO 2018206169 A1 WO2018206169 A1 WO 2018206169A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
outer part
extrudate
connecting part
plastic
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.)
Ceased
Application number
PCT/EP2018/054408
Other languages
German (de)
English (en)
Inventor
Jens-Uwe Hafermalz
Ekkehard Kneer
Dennis Fuechsel
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2018206169A1 publication Critical patent/WO2018206169A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D15/00—Producing gear wheels or similar articles with grooves or projections, e.g. control knobs
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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 relates to a method for producing a gear and such a gear, which is used in particular in a power steering.
  • a gear is a wheel that carries uniformly distributed teeth over its circumference.
  • Such gears are, for example, in power steering systems, which are formed, for example. As electric steering devices used.
  • Power steering aids the driver in steering by increasing the force applied by the driver when steering.
  • Such power steering systems reduce the force required by the driver, e.g. B. when maneuvering or at low speeds, must be applied.
  • an electric motor is used to apply an assist torque, this is also referred to as an electric steering device.
  • an electric steering device for motor vehicles has a helical gear with a helical gear, which has an inner part, a connecting part and an outer part.
  • the outer part carries teeth
  • the connecting part has spiral-shaped ribs. These ribs can run in both directions from one origin.
  • the electric steering device is advantageous due to the use of the presented helical gear in terms of cost and weight.
  • the use of plastic for the outer part causes improved damping.
  • Gears that are used in power steering for example, consist of polyamide rings that are glued to a metal hub. In these, the teeth are then brought by milling in the cast polyamide ring.
  • gears for power steering systems are known which consist of several parts.
  • These multi-part gears are positively and non-positively connected by connecting elements in order to transmit the torque from the ring gear to the shaft can.
  • toothed wheels which have an outer part with a toothing and an insert part as a hub, which are connected to one another by a connecting part.
  • the document DE 10 2014 104 284 AI describes a gear with an inner part, an outer part and a connecting part.
  • the outer part carries on the circumference teeth of the gear.
  • the connecting part connects the inner part with the outer part. It is further provided that the connecting part in the region of at least one end face encloses the teeth of the outer part at least in sections.
  • the outer part may consist of an unreinforced plastic.
  • the inner part in turn may consist of a steel material.
  • the document further describes an electromechanical steering device with such a gear.
  • the described gear wheel is characterized in that its outer part, which comprises the toothed rim or is formed as such, is produced by extrusion.
  • the outer part is made of a plastic, for example.
  • a thermoplastic material such as. For example, polyamide.
  • materials with higher viscosity can be used. So are in design Materials with a viscosity number higher than 300 can be used.
  • the extrusion does not entail a substantial reduction in the viscosity number, in contrast to the injection molding process.
  • the proposed gear can be produced by the following method steps. It is produced in a first step, an outer part with teeth on the outer periphery and thus a sprocket by means of a plastic extrusion process. During extrusion, solid to viscous curable masses are continuously extruded under pressure from a forming orifice, also referred to as die, die or mouthpiece. In this way, bodies are formed whose cross section corresponds to the shape of the opening and which are also referred to as extrudate. These bodies can theoretically have any length.
  • extruders such as, for example, piston extruders or screw extruders
  • the pressure for extruding the material is generated by means of a worm shaft. This is done in a worm cylinder. At the front end of the worm cylinder is the shaping opening.
  • the screw can be divided into three zones, namely in the rear area the so-called feed zone, then the compression zone and finally the discharge zone or metering zone.
  • the material for example a free-flowing granulate, is typically filled through a machine hopper and then heated so that the material melts and gives a moldable mass. This is then pressed through the opening.
  • the machine funnel can be fed with the material by means of corresponding upstream system components.
  • the extruder may be provided with electrical heating bands, which in different segments a different temperature control of the extruder or of the cylinder in which the material is taken up. In a particular embodiment, a temperature control is provided.
  • a plastic cylinder with a defined profile thus comes from the plastic extrusion machine, with the teeth of the toothed ring of the toothed wheel already finished and, consequently, the toothing of the finished toothed ring need not be reworked.
  • This is advantageous because the teeth could possibly be damaged in a post-processing.
  • it is advantageous that the viscosity of the material used during extrusion, in contrast to the injection molding process, not significantly reduced.
  • the extrudate after pressing inside and outside is supported until it has cooled sufficiently so that it does not deform.
  • the extrudate can be tempered or cooled in a calibration region continuously or else stepwise. In this area, a temperature control can be provided. In this way it is avoided that the extrudate deforms. This is particularly important because the extrudate, which forms the basis or the starting material for the outer part or the sprocket, no longer needs to be processed.
  • the cylinder or the extrudate is then shortened to the required size, according to the intended width of the gear.
  • various processing methods can be used, such as, for example, turning, milling, water jet cutting, laser beam cutting, etc.
  • a material for the outer part is an extrusive plastic, z.
  • a highly viscous plastic such as, polyamide provided.
  • the manufacturing process used also allows the use of a very ductile plastic for the toothing of a gear.
  • the outer part can then in the screen sprue method or in Stangen proportion. Point-casting method by a connecting part with the inner part, which may be a hub or a shaft, radially enclosed.
  • the gear is thus in this embodiment of at least three parts, namely outer part, Connecting part and inner part, made. But it is also conceivable another structure of a gear with outer part.
  • the inner part can be made of a metallic material which forms a positive connection to the connecting part, which can transmit the torque and also the axial force.
  • the connecting part is made of an unreinforced or reinforced plastic with a high strength and low thermal expansion. Due to the shrinkage of the connecting part during cooling additionally creates a frictional connection to the inner part.
  • the outer part is also made of a plastic that can be unreinforced or reinforced. The outer part is fixed to the connecting part via a positive and non-positive connection.
  • the materials of the gear are preferably chosen so that the strength from outside to inside is getting bigger.
  • Figure 1 shows an extrudate
  • Figure 2 shows an embodiment of a sprocket with extrusion profile.
  • Figure 3 shows an embodiment of a gear in an exploded view.
  • Figure 4 shows an embodiment of a gear.
  • Figure 5 shows the gear of Figure 4 in a first sectional view.
  • FIG. 6 shows the gear of FIG. 4 in a second sectional view.
  • Figure 1 shows an embodiment of an extrudate, which is generally designated by the reference numeral 10.
  • This extrudate 10 represents a cylindrical body as it is extruded from an extruder.
  • the width 12 of the extrudate 10 can be chosen almost arbitrarily.
  • the cross-section of the extrudate 10 is defined by the shape of the exit orifice of the extruder.
  • the illustration shows that the extrudate 10 has a kind of zig-zag profile and thus carries radially outwardly projecting teeth 16 at its circumference.
  • This extrudate 10 represents the starting material for an outer part of a toothed wheel to be produced. For this purpose, this only has to be shortened, so that its width corresponds to the width of the toothed wheel to be produced. It should be noted that from the extrudate 10 also several outer parts can be made.
  • FIG. 2 shows an outer part 20, which was produced from the extrudate 10 from FIG. 1 by shortening.
  • This outer part 20 represents a sprocket which carries at its periphery the outwardly projecting teeth 16. Due to the zigzag profile, a recess 22, which is open inwards, is also provided between two adjacent teeth 16. This recess 22 takes in one embodiment, the material of the connecting part and thus serves to transmit the torque in the use of the gear.
  • Figure 3 shows an exploded view of an embodiment of a gear, which is designated overall by the reference numeral 30.
  • the illustration shows the outer part 20 with the radially outwardly projecting teeth 16 and the radially inwardly directed recesses 22.
  • the teeth 16 are arranged uniformly over the circumference of the outer part 20.
  • This outer part 20, which forms a sprocket, was produced by means of an extrusion process.
  • the illustration also shows a connecting part 32 and an inner part 34, which is typically made of a metallic material.
  • the inner part 34 forms a positive connection to the connecting part 32, so that the torque and also the axial force is transmitted.
  • the connecting part 32 is typically made of an unreinforced or reinforced plastic. During manufacture, the connecting part 32 is injected between the inner part 34 and the outer part 20, so that they are securely connected to each other. The recesses 22 in the outer part 20 are thereby filled with material of the connecting part 32, so that a good transmission of torque and axial force is ensured between these two components.
  • the gearwheel 30 with the outer part 20 manufactured in accordance with the presented method here has a three-part construction. But there are also other constructions, for example. A two-part construction conceivable.
  • Figure 4 shows the gear 30 of Figure 3 with the outer part 20, the connecting part 32 and the inner part 34, which is also referred to as an insert part, in the mounted state.
  • This gear 30 is used, for example, in a power steering of a motor vehicle.
  • Figure 5 shows a first sectional view of the gear 30 of Figure 4. Again, the outer part 20, the connecting part 32 and the inner part 34 are clearly visible.
  • Figure 6 shows a further sectional view of the gear 30 with the outer part 20, the connecting part 32 and the inner part 34th

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une roue dentée (30) et une telle roue dentée. Ladite roue dentée comprend une partie extérieure (20) obtenue au moyen d'un procédé d'extrusion.
PCT/EP2018/054408 2017-05-11 2018-02-22 Procédé de fabrication d'une roue dentée Ceased WO2018206169A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017207951.7A DE102017207951A1 (de) 2017-05-11 2017-05-11 Verfahren zum Herstellen eines Zahnrads
DE102017207951.7 2017-05-11

Publications (1)

Publication Number Publication Date
WO2018206169A1 true WO2018206169A1 (fr) 2018-11-15

Family

ID=61616956

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/054408 Ceased WO2018206169A1 (fr) 2017-05-11 2018-02-22 Procédé de fabrication d'une roue dentée

Country Status (2)

Country Link
DE (1) DE102017207951A1 (fr)
WO (1) WO2018206169A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109695697A (zh) * 2019-01-25 2019-04-30 上海创率复合材料有限公司 齿轮及齿轮制造方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337672A (en) * 1980-05-15 1982-07-06 Samuel Shiber Speed changing floating power transmission ring
WO2005104692A2 (fr) * 2004-04-16 2005-11-10 Quadrant Epp Ag Vis sans fin de direction a assistance electronique
EP1777439A1 (fr) * 2005-10-19 2007-04-25 IMS Gear GmbH Roue dentée et procédé de fabrication associée
DE102008045847A1 (de) * 2008-09-05 2010-03-11 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Zahnrad
WO2013122282A1 (fr) * 2012-02-13 2013-08-22 남양공업주식회사 Engrenage à vis sans fin de direction assistée commandée par moteur (mdps)
DE102012102777A1 (de) 2012-03-30 2013-10-02 Zf Lenksysteme Gmbh Schraubrad für eine elektromechanische lenkvorrichtung
CN104534057A (zh) * 2014-12-19 2015-04-22 广东特固力士工业皮带有限公司 一种同步带齿轮及其轮齿条和制备方法
DE102014104284A1 (de) 2014-03-27 2015-10-01 Robert Bosch Automotive Steering Gmbh Zahnrad

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101091067B1 (ko) * 2011-02-18 2011-12-08 주식회사 광덕에이앤티 기어 휠 및 기어 휠의 제조방법

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337672A (en) * 1980-05-15 1982-07-06 Samuel Shiber Speed changing floating power transmission ring
WO2005104692A2 (fr) * 2004-04-16 2005-11-10 Quadrant Epp Ag Vis sans fin de direction a assistance electronique
EP1777439A1 (fr) * 2005-10-19 2007-04-25 IMS Gear GmbH Roue dentée et procédé de fabrication associée
DE102008045847A1 (de) * 2008-09-05 2010-03-11 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Zahnrad
WO2013122282A1 (fr) * 2012-02-13 2013-08-22 남양공업주식회사 Engrenage à vis sans fin de direction assistée commandée par moteur (mdps)
DE102012102777A1 (de) 2012-03-30 2013-10-02 Zf Lenksysteme Gmbh Schraubrad für eine elektromechanische lenkvorrichtung
DE102014104284A1 (de) 2014-03-27 2015-10-01 Robert Bosch Automotive Steering Gmbh Zahnrad
CN104534057A (zh) * 2014-12-19 2015-04-22 广东特固力士工业皮带有限公司 一种同步带齿轮及其轮齿条和制备方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109695697A (zh) * 2019-01-25 2019-04-30 上海创率复合材料有限公司 齿轮及齿轮制造方法
CN109695697B (zh) * 2019-01-25 2023-09-22 上海创率复合材料有限公司 齿轮及齿轮制造方法

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