WO2015062739A1 - Mécanisme de direction à plusieurs pignons - Google Patents

Mécanisme de direction à plusieurs pignons Download PDF

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Publication number
WO2015062739A1
WO2015062739A1 PCT/EP2014/002932 EP2014002932W WO2015062739A1 WO 2015062739 A1 WO2015062739 A1 WO 2015062739A1 EP 2014002932 W EP2014002932 W EP 2014002932W WO 2015062739 A1 WO2015062739 A1 WO 2015062739A1
Authority
WO
WIPO (PCT)
Prior art keywords
pinion
steering
rack
steering gear
gear according
Prior art date
Application number
PCT/EP2014/002932
Other languages
German (de)
English (en)
Inventor
Richard Hirschmann
Philippe Steck
Arne Schacht
Original Assignee
Thyssenkrupp Presta Ag
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 Thyssenkrupp Presta Ag filed Critical Thyssenkrupp Presta Ag
Publication of WO2015062739A1 publication Critical patent/WO2015062739A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • B62D3/126—Steering gears mechanical of rack-and-pinion type characterised by the rack
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0421—Electric motor acting on or near steering gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0442—Conversion of rotational into longitudinal movement

Definitions

  • the present invention relates to a steering gear for motor vehicles having the features of the preamble of claim 1.
  • a design of electrically assisted steering gear for motor vehicles is preferred in which the supporting force is introduced via a second toothing in the rack.
  • the servo drive acts on the rack via a second steering pinion and a second toothing.
  • steering gear in which in addition to the engagement of the steering pinion, a ball screw is provided on the rack, which is connected via a ball screw with a servo motor.
  • the steering power is introduced via the ball screw in the rack.
  • Tooth segment and a second driven by a servo motor pinion meshes with the second toothed segment.
  • This compact arrangement of the two pinion can be dispensed with a complex pressure piece. But since the support torque is introduced in the region of the input shaft, the space freedom is very limited.
  • a steering gear is provided, in particular for motor vehicles, with a steering housing in which a rack is longitudinally displaceable and connected for pivoting steerable wheels with these, wherein the rack is provided with a first toothed segment, which meshes with a first steering pinion of a pinion shaft and wherein the pinion shaft is indirectly connected to a steering wheel via an input shaft, and wherein the rack is provided with a second toothed segment which meshes with a second pinion, and wherein the rack is a third
  • Tooth segment the second tooth segment with respect to the
  • the required steering assist force is preferably applied by at least one electric motor, which acts on the second pinion and / or the third pinion.
  • Tooth segment are arranged in a second rack portion and the first toothed segment is arranged in a spaced from the second rack portion first rack portion. This arrangement results in an increased space freedom, since the support torque is not initiated in the region of the input shaft.
  • the second pinion are driven by a first electric motor and the third pinion by a second electric motor.
  • This embodiment is particularly advantageous in steering gears of a steer-by-wire steering.
  • This mechanical coupling of the two pinions is preferably via gears, worm wheels and / or bevel gears.
  • the axes of rotation of the two opposing pinions are arranged at an acute angle to each other and if the two rack segments which are located on the rack relative to the longitudinal axis, are arranged in mutually inclined planes, because in this way a Backlash of the teeth engagement by a bias of the rack can be achieved in the included angle into it.
  • the rack in the region of the second rack section has at least one guide which cooperates with at least one guide element for guiding the rack in the direction of the parallel or at an acute angle arranged rotational axes of the steering pinion, the steering pinion remain almost free of axial forces, the game can be set and the rack is precisely guided.
  • Rack section has at least one guide, with at least one guide element for guiding the rack in the direction of
  • Rotary axis of the first steering pinion cooperates.
  • the second toothed segment and the third toothed segment are opposite to the first
  • Longitudinal axis of the rack are offset. Preference is given to 90 degrees.
  • the at least one electric motor is controlled by a torsion sensor on the steering shaft.
  • Embodiments are provided with the same reference numerals in order to increase the clarity.
  • FIG. 1 shows a schematic arrangement of a steering gear with two pinions and two drive motors and a steering pinion
  • FIG. 5 is a perspective view of a steering gear with two pinions and a drive motor
  • Fig. 6 a three-dimensional representation of another steering gear with two
  • Fig. 7 is a perspective view of another steering gear with two of a drive motor by means of a worm shaft and two
  • Fig. 8 a spatial representation of another steering gear with two
  • Fig. 10 schematic representations of a steering gear with
  • worm gear 11, 12 schematic representations of a steering gear with gear transmission, as well
  • Fig. 13, 14 schematic representations of a steering gear
  • FIG. 1 shows a steering system for a motor vehicle with a steering wheel 1, which is rotatably coupled to an upper steering shaft 2 and a lower steering shaft 3.
  • the lower steering shaft 3 is in turn rotatably coupled to a first steering pinion 4.
  • the steering pinion 4 meshes in a known manner with a toothed segment 5 of a rack 6.
  • the rack 6 is in one
  • Steering housing slidably mounted in the direction of its longitudinal axis.
  • the rack 6 is connected to tie rods 7 via ball joints, not shown.
  • the tie rods 7 themselves are in a known manner via steering knuckle, each with a steered wheel 8 of the
  • a rotation of the steering wheel 1 leads via the connection of the steering shaft 2 and 3 and the pinion 4 to a
  • Torque on the steering wheel 1 is required.
  • Two servomotors 10, 11 are provided to assist the driver in this steering movement.
  • the direction of rotation and the torque of the servomotors 10, 11 are controlled by a torsion sensor 12 on the steering shaft.
  • the servomotors 10, 11 conduct the steering assist force to the rack 6 via a second pinion 13 engaged with a second sector gear 14 and a third pinion 15 engaged with a third sector gear 16, respectively.
  • the first toothed segment 5 lies in a first toothed rack section 17 and the second and third toothed segments 14, 16 are arranged in a second toothed rack section 18 which is spaced apart from the first toothed rack section.
  • the second and third toothed segments 14, 16 are arranged on opposite sides of the rack 6, wherein the third toothed segment 16 is provided on the same rack side as the first toothed segment 5.
  • the transmission range of the power steering analogous to Figure 1 is shown in Figure 2 and Figure 3 in more detail.
  • the rack 6 is provided in the region of the opposing tooth segments 14 and 16 with an approximately square cross-section.
  • the toothed segments 14 and 16 are arranged on two opposite side surfaces of the rack 6.
  • the toothed segments 14 and 16 are inclined relative to each other at an acute angle of about 10 °, so that the planes defined by the toothed segments 14 and 16 converge towards each other as seen by the servomotors 10, 11. Accordingly, the axis of rotation 131 of the second pinion 13 and the axis of rotation 151 of the third pinion 15, in
  • Tooth segments 14 and 16 In the guides 19 with respect to the
  • Guide elements 20 which guide the rack 6.
  • the rack 6 is fixed by the guide elements 20 in their vertical orientation, ie in their relative position to the axes of rotation of the pinion 13 and 15. In this way, the backlash of the gearing engagement between the second
  • the setting uses the approximately V-shaped Orientation of the pinion 13 and 15 to each other. With elastic elements, not shown, a corresponding bias to reduce the backlash can be formed.
  • the second pinion 13 and the third pinion 15 must be in operation
  • the two pinions 13, 15 are driven by two separate drive motors.
  • the pinions 13, 15 are coupled via a reduction gear, in particular a harmonic drive gear, a planetary gear or a cycloidal gear with the respective servo motor 10, 11.
  • the torsion sensor 12 is provided with a torsion bar 21 which is arranged between the steering shaft and the first steering pinion 4.
  • a rotation of the steering wheel 1 leads to a rotation of the steering shaft and thus to the rotation of the torsion bar 21.
  • This torsion is detected by the Torsionssensor and fed to the steering control unit.
  • Control unit determines therefrom the correct control variable for the servomotors 10, 11.
  • the power steering assistance is dimensioned as a function of the torsion of the torsion bar 21.
  • Figures 5, 6 and 7 show three embodiments with only a single servo motor.
  • the servo motor 11 drives the third pinion 15, wherein the second pinion 13 is driven via a toothing of a gear transmission.
  • the pinion 13 is rotatably connected to a first gear 22, while the second
  • Steering pinion 15 is rotatably connected to a second gear 23.
  • the gears 22 and 23 are engaged with each other. They have the same circumference, so that the rotational angular velocity of the pinions 13 and 15 is identical. This is required for identically formed interventions between the pinion 13 and the toothed segment 14 on the one hand and the pinion 15 and the toothed segment 16 on the other. It can be in others
  • Embodiments also be provided that the toothing interventions are formed differently on both sides of the rack 6, in particular the two pinions have a different circumference or pitch circle. Then the synchronization must be done via appropriately adapted gears or other synchronization means.
  • the single servo motor 11 drives a third pinion 15, wherein the second pinion 13 is connected via a toothing of a toothed gear
  • the opposing tooth segments of the two pinions 13, 15 are offset by 90 degrees about the longitudinal axis of the rack 6 relative to a toothed segment, which is in engagement with the steering shaft coupled to the steering pinion 4.
  • the arrangement of the pinion on separate rack sections it is possible to arrange the teeth in different angular positions and thus adapt the steering gear to different vehicles and their space individually.
  • FIGS. 5 and 6 show a first one
  • the guide element 20 is here in the region of the engagement of the first pinion 4 in the rack 6 also has a guide 24 with respect to the transmission housing fixed in the
  • Steering gear arranged guide member 25 is provided, as well as a
  • the guide 26 may also be formed as a pressure piece, as is known in the art. However, there may be embodiments in which it can be dispensed with a complex pressure piece for adjusting the game of engagement pinion / rack.
  • a further embodiment of the transmission according to Figures 5 and 6 provides that the gear 22 with the second pinion 13 rigid in the
  • Gear housing mounted and connected to the pinion 13, while the bearing of the second gear 23 and the third pinion 15 is designed to be movable within narrow limits, so that a variable center distance between the pinion 13 and the pinion 15 is ensured.
  • Fig. 8 shows a further possible arrangement of the second and third pinion, in which the pinions are oriented in opposite directions. The ones shown here
  • FIG. 9 illustrates a schematic transmission view, as corresponds to FIG.
  • FIG. 10 shows an exemplary embodiment with a worm gear, wherein the drive has a first worm wheel 31 via a worm shaft 30
  • Worm 31 is driven via a corresponding gear stage.
  • Figures 9 and 10 illustrate corresponding gear transmission in each of which a pinion with a gear 33, 34 is fixedly connected, which is driven via a shaft 35 of the servomotor 11.
  • Figures 13 and 14 show schematic bevel gear. About one
  • Bevel gear which is connected to the servo motor 11 via a shaft 36, the two pinions (13, 15) via a respective gear 37, 38th
  • the two can be fixed with one pinion in each case
  • a first gear 37 in the bevel gear and a second gear 38 are in engagement with the first gear.
  • the preceding figures are intended to illustrate that the object according to the invention is not limited to specific types of gearboxes and drives.
  • the second and third pinion can be driven by any type of transmission, with one or two servomotors are provided.
  • the steering gear according to the invention makes it possible to choose a power steering with one or two servomotors in the range of a second spaced from the engagement of the steering pinion in the rack rack section, so that the steering gear particularly high support torque at flexible
  • the steering gear according to the invention is suitable for use in a steer-by-wire steering system in which no mechanical coupling between the steering wheel and the steering gear is present.
  • the other electric motor can thus ensure emergency operation. This is particularly relevant, in the light of the fact that the full drive power of the steering system is needed preferably when parking and thus at low vehicle speeds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne un mécanisme de direction destiné en particulier à des véhicules automobiles et comportant un carter de direction dans lequel est montée mobile longitudinalement une crémaillère (6) qui est reliée aux roues directrices pour leur pivotement. La crémaillère (6) est munie d'un premier segment denté (5) qui est en prise avec un premier pignon de direction (4) d'un arbre à pignon et l'arbre à pignon est relié à une roue directrice (1) indirectement par l'intermédiaire d'un arbre d'entrée (2). La crémaillère (6) est munie d'un deuxième segment denté (14) qui vient en prise avec un deuxième pignon (13), et la crémaillère (6) est munie d'un troisième segment denté (16) qui est opposé au deuxième segment denté (14) par rapport à l'axe longitudinal de la crémaillère (6), et un troisième pignon (15) est en prise avec le troisième segment denté (16).
PCT/EP2014/002932 2013-11-04 2014-11-03 Mécanisme de direction à plusieurs pignons WO2015062739A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013018436.3 2013-11-04
DE102013018436.3A DE102013018436B4 (de) 2013-11-04 2013-11-04 Lenkgetriebe mit mehreren Ritzeln

Publications (1)

Publication Number Publication Date
WO2015062739A1 true WO2015062739A1 (fr) 2015-05-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/002932 WO2015062739A1 (fr) 2013-11-04 2014-11-03 Mécanisme de direction à plusieurs pignons

Country Status (2)

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DE (1) DE102013018436B4 (fr)
WO (1) WO2015062739A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111232050A (zh) * 2018-11-29 2020-06-05 Trw有限公司 转向柱组件
CN112606898A (zh) * 2020-12-10 2021-04-06 东风汽车集团有限公司 一种轴式电动助力转向装置及机动车
US20210300461A1 (en) * 2020-03-25 2021-09-30 Steering Solutions Ip Holding Corporation Pinion electric power steering system
US11433940B2 (en) 2017-10-05 2022-09-06 Thyssenkrupp Presta Ag Electromechanical power steering system having a helical gear mechanism and having a compensation device for supporting a floating bearing on the gear housing
WO2023046355A1 (fr) * 2021-09-27 2023-03-30 Robert Bosch Gmbh Boîtier de direction pour système de direction d'un véhicule utilitaire

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019119128A1 (de) * 2019-07-15 2021-01-21 Ford Global Technologies Llc Lenkgetriebe für ein Kraftfahrzeug
DE102020212788A1 (de) * 2020-10-09 2022-04-14 Thyssenkrupp Ag Wellenkupplung mit Notkupplungseigenschaft sowie Lenkgetriebe und Hilfskraftlenkung mit einer solchen Wellenkupplung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11182637A (ja) * 1997-12-19 1999-07-06 Koyo Seiko Co Ltd ウォームギヤ伝動装置及び電動パワーステアリング装置
US20060278466A1 (en) * 2005-06-13 2006-12-14 Bo Cheng Electric power steering systems
DE102009027468A1 (de) * 2009-07-06 2011-01-13 Robert Bosch Gmbh Kraftübertragungsanordnung
DE102010027553A1 (de) * 2010-07-19 2012-01-19 Thyssenkrupp Presta Ag Doppelritzel-Lenkgetriebe

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6705421B2 (en) * 2002-05-31 2004-03-16 Visteon Global Technologies, Inc. Assisted steering system with out-of-phase driver and assist pinions
US20040045387A1 (en) * 2002-09-06 2004-03-11 Visteon Global Technologies, Inc. Barrel-shaped pinion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11182637A (ja) * 1997-12-19 1999-07-06 Koyo Seiko Co Ltd ウォームギヤ伝動装置及び電動パワーステアリング装置
US20060278466A1 (en) * 2005-06-13 2006-12-14 Bo Cheng Electric power steering systems
DE102009027468A1 (de) * 2009-07-06 2011-01-13 Robert Bosch Gmbh Kraftübertragungsanordnung
DE102010027553A1 (de) * 2010-07-19 2012-01-19 Thyssenkrupp Presta Ag Doppelritzel-Lenkgetriebe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11433940B2 (en) 2017-10-05 2022-09-06 Thyssenkrupp Presta Ag Electromechanical power steering system having a helical gear mechanism and having a compensation device for supporting a floating bearing on the gear housing
CN111232050A (zh) * 2018-11-29 2020-06-05 Trw有限公司 转向柱组件
US20210300461A1 (en) * 2020-03-25 2021-09-30 Steering Solutions Ip Holding Corporation Pinion electric power steering system
CN112606898A (zh) * 2020-12-10 2021-04-06 东风汽车集团有限公司 一种轴式电动助力转向装置及机动车
WO2023046355A1 (fr) * 2021-09-27 2023-03-30 Robert Bosch Gmbh Boîtier de direction pour système de direction d'un véhicule utilitaire

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Publication number Publication date
DE102013018436A1 (de) 2015-05-07
DE102013018436B4 (de) 2020-10-08

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