WO2015154920A1 - Dispositif de direction électromécanique comportant une roue dentée et procédé de fabrication d'une roue dentée - Google Patents

Dispositif de direction électromécanique comportant une roue dentée et procédé de fabrication d'une roue dentée Download PDF

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Publication number
WO2015154920A1
WO2015154920A1 PCT/EP2015/054594 EP2015054594W WO2015154920A1 WO 2015154920 A1 WO2015154920 A1 WO 2015154920A1 EP 2015054594 W EP2015054594 W EP 2015054594W WO 2015154920 A1 WO2015154920 A1 WO 2015154920A1
Authority
WO
WIPO (PCT)
Prior art keywords
tooth
connecting part
toothed
steering device
gear
Prior art date
Application number
PCT/EP2015/054594
Other languages
German (de)
English (en)
Inventor
Dennis FÜCHSEL
Jens Hafermalz
Original Assignee
Robert Bosch Automotive Steering 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 Automotive Steering Gmbh filed Critical Robert Bosch Automotive Steering Gmbh
Publication of WO2015154920A1 publication Critical patent/WO2015154920A1/fr

Links

Classifications

    • 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

Definitions

  • the invention relates to a gear, in particular a screw or worm wheel, which is used in an electromechanical steering device, in particular a power steering.
  • the invention further relates to a method for producing the gear.
  • Screw or worm wheels are used in worm gears, which constitute a kind of a screw gear and comprise a helical worm that rotates during rotation of an engaging in this gear or worm wheel.
  • Worm gears are thus gear transmission with generally crossed at right angles axes.
  • the generally driving screw with cylindrical or globoidischer design cooperates with the associated, meshing in the worm worm wheel with corresponding teeth.
  • the contact of worm and worm wheel takes place in lines within an intervention field.
  • screws have one or more teeth, which, like flights of screws, are wound around the screw axis at a constant pitch.
  • Such worm gears are used in steering devices, such as. Power Steering, for transmitting steering torque to the rack of the steering system.
  • Power steering are used to reduce the force required to operate the steering wheel of a motor vehicle when steering in a standing position, maneuvering or at low speeds.
  • the power steering assists the driver in steering, by the force applied by the driver by an additionally applied torque, eg. By an electric motor, is amplified.
  • Known screw or worm wheels consist, for example, of a cast polyamide ring, which are glued to a metal hub. Then the toothing is introduced by milling in the cast polyamide ring.
  • an electric steering device for motor vehicles which has a worm gear, which consists of a worm mounted in a housing and a worm wheel coupled to an input shaft.
  • the Worm wheel is part of an elastic compensating coupling whose coupling parts are coupled together only by an elastic spacer.
  • the worm wheel is constructed mirror-symmetrically and mounted on the spacer.
  • helical gears for power steering which consist of several parts.
  • This multi-part helical gears are positively and non-positively connected by connecting elements in order to transmit the torque from the ring gear to the shaft can.
  • gears which have an outer part with a toothing and have an insert as a hub or inner part, which are connected by a connecting part with a Schirmanguss.
  • the document EP 1 777 439 A1 describes such a gear and a method for producing this gear in which the outer part and the insert are positively connected to the connecting part, wherein the connecting part is poured by means of Schirmanguss.
  • the imaginary gear has an inner part a connecting part and teeth, wherein each tooth comprises a tooth body and tooth flanks, wherein the tooth body through the
  • Connecting part is formed and the tooth flanks are formed by an additional tooth cover.
  • the tooth sheath forms the two tooth flanks and one tooth head in at least one tooth. In a further embodiment, this is provided for all teeth.
  • the tooth sheaths of at least two teeth are connected to the end face of the toothed wheel. It can be provided that in at least one tooth or even all teeth in the tooth body of the connecting part in the axial direction at least one opening or a recess is provided, which is filled by the tooth sheath.
  • the connecting part forms on the circumference of the tooth body or the tooth body.
  • the tooth root is completely formed by the tooth body of the connecting part.
  • the connecting part at the periphery of the tooth body with a groove in the tooth flank and possibly the tooth head form.
  • the tooth sheath can be made of an unreinforced plastic with additives for
  • Friction reduction such as PTFE and / or molybdenum sulfite and / or graphite, and thus consist of a material without abrasive property.
  • the tooth sheath can consist of a carbon fiber reinforced plastic. This is also economically feasible due to the small amount of material required for the dental sheath. By the abrasion of the carbon fibers, a lubricating effect is achieved. Likewise, a thermal expansion coefficient can be achieved, which corresponds to that of possibly also reinforced material of the connecting part.
  • the inner part may consist of a steel material.
  • the method described is used to produce a gear, in particular a gear of the type described above.
  • a connecting part is molded onto an inner part in a first method step. This is the
  • the connecting part is injection-molded by means of an injection molding process.
  • the connecting part is molded in such a way that grooves are formed in the tooth bodies.
  • the tooth sheaths can be molded on the front side.
  • the dental shells are over at least one Grooved in the connection part molded.
  • the tooth sheaths can also be injected radially. There is a material connection and / or positive connection between the connecting part and the toothed sheaths.
  • an insert which may be a hub or a shaft, is radially enclosed in the umbrella gate or rod or point gate method by a connecting part. On this connecting part will be on everyone
  • Tooth body molded on a tooth sheath in the rod or NOTEanguss vide.
  • the tooth sheath can be injection-molded on the front side or radially on the periphery by one injection point each. These tooth sheaths form the tooth flanks.
  • the gear described consists in an embodiment of an inner part, which is a hub or a shaft and usually consists of a steel material, a connecting part which receives the inner part and on the circumference of teeth or
  • Toothed body without tooth flanks has.
  • the toothed bodies can have a groove in the region of the tooth flanks.
  • the connecting part consists of a reinforced plastic and can be produced by injection molding and forms the tooth body with the fully executed tooth root of the toothing. On the tooth body of the connecting part, a tooth cover is applied.
  • the groove in the tooth body of the connecting part is filled in an embodiment in the injection molding process by an unreinforced plastic so that it forms the tooth flank of the tooth. This is called a dental sheath.
  • the described method produces a toothed wheel with high tooth root strength and tooth shear strength, since the tooth bodies consist of a reinforced plastic.
  • the gear In the field of rolling with the pinion or in meshing engagement, the gear consists of an unreinforced plastic.
  • the unreinforced plastic in the tooth flank does not have to be designed for high strength, but can be such
  • the connecting part of the reinforced plastic shows a slight shrinkage, and can therefore be manufactured in close tolerances.
  • the gear quality of the gear is particularly good. Since the gear is largely made of reinforced plastic, the influence of thermal expansion and conditioning is very low. In this way, the transmission tolerances can be improved, resulting in Noise reduction contributes. Because the gear for the most part of reinforced
  • the tooth sheath can be molded laterally into the groove of the connecting part and forms in design only the tooth flanks.
  • the tooth head and the tooth base is formed by the reinforced plastic of the connecting part.
  • the tooth sheath can also be injected in the tooth tip.
  • the tooth head is also formed by the tooth sheath. This embodiment of the tooth sheath does not form a weld line in the unreinforced plastic and is favorable for the life.
  • Figure 1 shows a basic structure of an embodiment of the gear.
  • FIG. 2 shows a section through the gear from FIG. 1.
  • FIG. 3 shows a further embodiment of the toothed wheel.
  • Figure 4 shows the gear of Figure 3 in a sectional view.
  • FIG. 5 shows a detail of the gear from FIGS. 1, 2, 3 and 4.
  • FIG. 5a shows an illustration corresponding to FIG. 5 in an exploded view.
  • Figure 6 shows a further embodiment of the gear in a sectional view.
  • FIG. 7 shows a section through a further embodiment of the gear.
  • FIG. 8 shows a section through the gear from FIG. 7.
  • FIG. 9 shows a section from FIG. 8.
  • FIG. 10 shows a connecting part with toothed bodies and inner part.
  • Figure 1 1 shows a section of another gear with a cut tooth.
  • Figure 12 shows the gear of Figure 1 1 in another illustration.
  • Figure 13 shows a gear
  • Figure 14 shows a section of a connecting part.
  • Figure 15 shows a section of a connecting part.
  • FIG. 16 shows a further detail of a connecting part.
  • Figure 1 shows the basic structure of an embodiment of the gear, which is generally designated by the reference numeral 10.
  • the gear 10 is shown in a plan view and in two sectional views.
  • the gear 10 comprises an inner part 12, a
  • Figure 2 shows a section through the gear 10. To recognize the inner part 12, the connecting part 14, on whose circumference toothed body 20 formed on the lateral
  • Regions are the tooth sheath 16, which form the tooth flanks 18, which are performed by the connection 19 at both end faces to a closed ring, are provided.
  • FIG. 3 shows a further embodiment of the gear, which is designated overall by the reference numeral 30.
  • the gear 30 comprises an inner part 32, a connecting part 34 and a tooth sheath 36.
  • toothed bodies 40 are formed at the periphery of the connecting part.
  • the tooth sheath 36 which forms the tooth flanks 38, arranged. Tooth heads 42 of the tooth body 40 are not covered with the tooth sheath 36.
  • FIG. 4 shows the toothed wheel 30 from FIG. 3 in an end section. It can be seen that the tooth sheath 36, which forms the tooth flanks 38, only covers the flanks of the toothed bodies 40, which are formed on the circumference of the connecting part 34. The tooth heads 42 are not covered.
  • Figure 5 shows a section in section of the embodiment of the gear 10 and 30 of Figures 1 to 4.
  • the illustration illustrates that the tooth flanks 38 are injected into recesses or grooves 44 in the tooth body 40 of the connecting part 34.
  • 40 grooves 46 are introduced into the Zahngropern, in which the tooth sheaths 36, the
  • tooth flanks 38 are injected. In this way, a secure connection between the connecting part 34 and tooth sheath 36 is ensured.
  • the tooth bodies 40 completely form a tooth root 41. Thus, the material with the greatest strength absorbs the large stresses in the tooth root area.
  • FIG. 5a shows an illustration corresponding to FIG. 5 in an exploded view.
  • the tooth sheath 36 includes the tooth flanks 38.
  • the tooth tips 42 are formed by the toothed body 40 of the connecting part 34.
  • a rear end face 45 is also formed by the tooth sheath 36, d. H. the tooth body is covered on both end faces by the end faces 45 of the tooth sheath 36.
  • the front face is through the
  • the two tooth flanks 38 and the two end faces 45 form a ring around the tooth body 40. This ring is the tooth sheath 36.
  • FIG. 6 shows, in an end section, a further embodiment of the toothed wheel 50 with an inner part 52, a connecting part 54 and a tooth sheath 56
  • Connecting parts 54 tooth body 60 are formed.
  • the connecting parts 54 tooth body 60 are formed.
  • the tooth heads 62 are part of the toothed body 60.
  • FIG. 1 An axial section through the gear 70 is shown in FIG. The diagram illustrates that the tooth sheath 76 also includes the tooth head 82, the tooth head 82 is thus part of the tooth sheath 76.
  • the complete tooth sheath 76 thus consists of the
  • FIG. 8 shows an end section of the toothed wheel 70 from FIG. 7 with the inner part 72, the connecting part 74, which includes spokes, and the tooth sheath 76.
  • This tooth sheath 76 includes tooth flanks 78, tooth tips 82 and the end faces 79, which are not shown in this section.
  • the tooth sheath 76 encloses the tooth body 80.
  • FIG. 8 A section of FIG. 8 is shown in FIG. It can be seen that the tooth sheath 76 is injected with tooth flanks 78 and tooth tips 82 in recesses 84 and in grooves 86 of the tooth body 80 of the connecting part 74.
  • FIG. 10 shows a connecting part 90, which is injection-molded onto an inner part 92. At the periphery of the connecting part 90 tooth body 94 are formed. The illustration shows the embodiment after the first method step of the presented method.
  • a further gear 100 is shown in a section. This comprises an inner part 102, a connecting part 104 and tooth shells 106 which cover the tooth bodies 110. To this end, the tooth shells 106 form tooth flanks 108 of teeth 120. A tooth 120a is shown in section, so that it can be seen that the tooth sheath 106 completely surrounds the tooth body 110.
  • Figure 12 shows the gear 100 of Figure 1 1 with the tooth 120a shown in section in a different perspective.
  • the teeth 120 are each formed from the tooth body 1 10, which is completely surrounded by the tooth sheath 106.
  • the tooth flanks 108 and the end faces 109 form the tooth sheath 106.
  • FIG. 13 shows a further toothed wheel 121 with an inner part 122, a connecting part 124 and tooth sheaths 126. It can be seen that adjacent tooth sheaths 126 are each connected to one another via a sprue channel 125. In the illustration, three tooth sheaths 126 are each connected to the sprue channel 125.
  • Figure 14 shows a section of a connecting part, the total with the
  • Reference numeral 150 is designated. This connecting part 150 forms on the periphery of a series of toothed body 152. It can be seen that in front sides 154 of the toothed body 152 openings 156 are provided. These openings 156 are filled by the material of the tooth sheath, not shown here. In this way, the connection between the tooth body 152 and the tooth sheath is strengthened.
  • FIG. 15 shows a section of a further connecting part 160 with toothed bodies 162.
  • a toothed body 162a is shown in a section. It can be seen that in both End faces 164a and 164b, respectively, an opening 166a and 166b is provided. These two openings 166a and 166b are not interconnected,

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)

Abstract

L'invention porte sur une roue dentée et sur un procédé de fabrication de la roue dentée. La roue dentée (10) comprend une partie intérieure (12), une partie de liaison (14) et des dents, chaque dent comprenant un corps de dent (20) et des flancs de dent (18), le corps de dent (20) étant formé par la partie de liaison (14) et les flancs de dents (18) par une enveloppe de dent supplémentaire (16).
PCT/EP2015/054594 2014-04-08 2015-03-05 Dispositif de direction électromécanique comportant une roue dentée et procédé de fabrication d'une roue dentée WO2015154920A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014104949.7A DE102014104949B4 (de) 2014-04-08 2014-04-08 Zahnrad
DE102014104949.7 2014-04-08

Publications (1)

Publication Number Publication Date
WO2015154920A1 true WO2015154920A1 (fr) 2015-10-15

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PCT/EP2015/054594 WO2015154920A1 (fr) 2014-04-08 2015-03-05 Dispositif de direction électromécanique comportant une roue dentée et procédé de fabrication d'une roue dentée

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DE (1) DE102014104949B4 (fr)
WO (1) WO2015154920A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020216511A1 (fr) * 2019-04-26 2020-10-29 Zf Friedrichshafen Ag Procédé de fabrication d'un module de crémaillère ainsi que module de crémaillère et servofrein
US11255420B2 (en) 2017-12-22 2022-02-22 Thyssenkrupp Presta Ag Worm gear for a worm gear system in a motor vehicle steering device having an injection-moulded support ring

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102395672B1 (ko) 2015-12-15 2022-05-11 주식회사 만도 전동식 조향장치의 감속기
DE102017223305B4 (de) 2017-12-20 2021-01-28 Technische Universität Dresden Zahnrad aus endlosfaserverstärktem Kunststoff und Verfahren zu dessen Herstellung
EP3756802A1 (fr) * 2019-06-26 2020-12-30 Hilti Aktiengesellschaft Roue dentée composite pour un marteau de forage électropneumatique
US11300190B1 (en) * 2020-09-29 2022-04-12 GM Global Technology Operations LLC Gear assembly with optimized configuration for mesh stiffness

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US857144A (en) * 1906-12-20 1907-06-18 Erhard T Alber Antifriction gear-tooth.
DE19911432A1 (de) * 1999-03-05 2000-09-21 Brose Fahrzeugteile Schnecken- oder Spindelgetriebe
DE10119235A1 (de) * 2000-04-20 2001-10-31 Unisia Jecs Corp Kunststoffzahnrad und Verfahren zu dessen Herstellung
WO2002038432A1 (fr) * 2000-11-13 2002-05-16 Zf Lenksysteme Gmbh Mecanisme de direction electrique destine a des vehicules automobiles
EP1777439A1 (fr) * 2005-10-19 2007-04-25 IMS Gear GmbH Roue dentée et procédé de fabrication associée
DE102012102776A1 (de) * 2012-03-30 2013-10-02 Zf Lenksysteme Gmbh Schraubrad für eine elektromechanische lenkvorrichtung

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DE667565C (de) * 1936-12-10 1938-11-14 Roemmler Akt Ges H Zahnrad
US6071204A (en) * 1998-07-10 2000-06-06 Sealtek Fabrications Ltd. Sprocket with replaceable wear-absorbing inserts
JP2005140221A (ja) * 2003-11-06 2005-06-02 Juki Corp 歯車
US20070089555A1 (en) * 2005-10-21 2007-04-26 Koji Tomoda Composite gear
FR2978222B1 (fr) * 2011-07-21 2014-01-10 Jtekt Europe Sas Roue d'engrenage d'un reducteur a vis sans fin

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US857144A (en) * 1906-12-20 1907-06-18 Erhard T Alber Antifriction gear-tooth.
DE19911432A1 (de) * 1999-03-05 2000-09-21 Brose Fahrzeugteile Schnecken- oder Spindelgetriebe
DE10119235A1 (de) * 2000-04-20 2001-10-31 Unisia Jecs Corp Kunststoffzahnrad und Verfahren zu dessen Herstellung
WO2002038432A1 (fr) * 2000-11-13 2002-05-16 Zf Lenksysteme Gmbh Mecanisme de direction electrique destine a des vehicules automobiles
EP1777439A1 (fr) * 2005-10-19 2007-04-25 IMS Gear GmbH Roue dentée et procédé de fabrication associée
DE102012102776A1 (de) * 2012-03-30 2013-10-02 Zf Lenksysteme Gmbh Schraubrad für eine elektromechanische lenkvorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11255420B2 (en) 2017-12-22 2022-02-22 Thyssenkrupp Presta Ag Worm gear for a worm gear system in a motor vehicle steering device having an injection-moulded support ring
WO2020216511A1 (fr) * 2019-04-26 2020-10-29 Zf Friedrichshafen Ag Procédé de fabrication d'un module de crémaillère ainsi que module de crémaillère et servofrein

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Publication number Publication date
DE102014104949A1 (de) 2015-10-08
DE102014104949B4 (de) 2022-11-03

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