WO1999057000A1 - Dispositif d'assistance electrique de direction - Google Patents

Dispositif d'assistance electrique de direction Download PDF

Info

Publication number
WO1999057000A1
WO1999057000A1 PCT/CH1999/000143 CH9900143W WO9957000A1 WO 1999057000 A1 WO1999057000 A1 WO 1999057000A1 CH 9900143 W CH9900143 W CH 9900143W WO 9957000 A1 WO9957000 A1 WO 9957000A1
Authority
WO
WIPO (PCT)
Prior art keywords
steering
housing
steering shaft
aid according
shaft
Prior art date
Application number
PCT/CH1999/000143
Other languages
German (de)
English (en)
Inventor
Stefan Battlogg
Original Assignee
Krupp 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 Krupp Presta Ag filed Critical Krupp Presta Ag
Publication of WO1999057000A1 publication Critical patent/WO1999057000A1/fr

Links

Classifications

    • 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
    • B62D5/0409—Electric motor acting on the steering column
    • B62D5/0412—Electric motor acting on the steering column the axes of motor and steering column being parallel
    • B62D5/0415—Electric motor acting on the steering column the axes of motor and steering column being parallel the axes being coaxial

Definitions

  • the invention relates to a steering aid according to the preamble of claim 1.
  • a steering aid with an electric drive has become known from EP 0 124 790.
  • the force is coupled in with the help of a servo motor, which acts on the steering shaft via a planetary gear.
  • the transmission and the motor are arranged coaxially with respect to the steering shaft, the steering shaft being guided centrally through the arrangement. Since the motor and the transmission are designed as a separate, assembled unit, the arrangement becomes voluminous and consists of a large number of parts, which is disadvantageous in terms of economy and reliability.
  • the voluminous design means that less installation space is available, especially in the direction of the shaft axis, which is particularly disadvantageous for the safety functions. If the handlebar hits the steering wheel, the energy must be absorbed as advantageously as possible so as not to injure the vehicle driver.
  • the object of the present invention is to eliminate the disadvantages of the aforementioned prior art.
  • the task is to realize an electric steering aid for a steering arrangement, which is extremely compact and which allows a quick response with good dynamics with responsive steering behavior for the handlebar, which works with high efficiency and is economical to manufacture.
  • a disk-shaped electric motor is combined with a planetary gear and both are installed coaxially in the shaft of a steering spindle, a steering shaft or a steering gear journal, the shaft being interrupted accordingly in the installation area of the drive unit along the steering shaft axis, or the steering shaft in this area encloses the drive unit along the steering shaft axis.
  • the rotor of the disk-shaped electric motor carries a pinion on its shaft, which is rotatably mounted about the steering shaft axis, and is designed as a sun gear for the planetary gear. -3- det. This rotor runs between the stators, which are arranged with the rotor in an enclosing housing.
  • the housing is designed as a planet gear carrier housing, on the end face of which planet carriers, preferably two, are rotatably mounted such that they are in engagement with the pinion or sun gear on the one hand and are in engagement with an internal toothing of a stationary surrounding ring gear on the other hand.
  • the steering shaft is firmly connected to the housing in the area of the planet gear bearing. This is preferably the steering shaft side in the direction of the steering wheel arrangement.
  • the opposite side of the housing in the axial shaft axis direction forms the output of the drive arrangement and accommodates fastening zones in order to be able to be connected to control shaft elements on the wheel side, for example via an articulated fork and a universal joint.
  • the housing which accommodates the drive motor and the planet gears, has openings formed radially to the shaft axis in the outer region of the planet gear carrier so that they can reach through there and engage in the internal toothing of the ring gear.
  • the ring gear is preferably designed such that it can be displaced in the axial direction of the steering shaft axis in order to take it out of engagement with the planet gears as required.
  • Magnetic devices are suitable for this purpose, for example, which pull the ring gear back, for example under spring preload.
  • the or the stators of the electric motor are thermally conductively connected in the enclosing and rotating housing, so that good heat dissipation can take place.
  • the steering shaft is at the same time part of the -4- drive or the housing, which serves as a planet carrier and at the same time part of the housing for receiving the electric motor.
  • This nested design leads to a unit of the drive which is very compact and simple.
  • There is a large degree of freedom for the design of the steering shaft it can easily have large diameters, if necessary, for example, if additional installations are required in the steering shaft, without the entire system having to be fundamentally changed.
  • a large steering shaft diameter always leads to larger sizes because then the gear parts, in particular the sun gear, must also be made correspondingly larger.
  • the arrangement also leads to high efficiencies and can also be cooled well with little effort. This leads to high economic efficiency with a compact design.
  • Fig. 1 schematically, in the form of an exploded view, the arrangement from the front, with the output side at the bottom left and the steering shaft connection side at the top right in the direction of the steering wheel
  • FIG. 3 shows schematically and in a sectional view an arrangement of a steering aid according to the invention -5-
  • the steering shaft 1, which is connected to the steering wheel, is rotatably connected to the housing 3, which receives the electric motor 30 on the one hand and the sun gear 14 and the planet gears 8, 8 'on the other hand, which together with the ring gear 6 the planetary gear 40 form.
  • the housing 3 connected to the steering shaft 1 thus rotates about the shaft axis 1 a, with the built-in motor drive 30 and the planetary gear 40 coupling in force as required.
  • This force coupling is carried out correspondingly via control electronics, which forms a servo control loop with the sensors (not shown in the illustration).
  • the planetary gear 40 consists of a pinion arranged in the shaft axis la, which is designed as a sun gear and at the same time receives the rotor 17 of the drive motor 30 at one end of the axis.
  • This sun gear 14 is mounted on both sides coaxially in the housing 3 or in the region of the connection of the steering shaft 1 and the housing 3 with bearings 11, 15, which are preferably designed as rolling, for example as ball bearings.
  • the planet gear 8, preferably two planet gears 8, 8 ', are mounted radially to the shaft axis la in the front housing part 3 with bearing axles 9, 9' in such a way that these gears are in engagement with the sun gear 14.
  • thrust washers 23, 23' can advantageously be provided and additionally slide bearing bushes 24, 24 'mounted on the axles around the bearing friction -6- to keep it small.
  • the bearing axles 9, 9 ' can for example be arranged in the housing 3 via bores or housing recesses 25, 25'.
  • the planet gears 8, 8 ′ engage in the peripheral area in an internally toothed ring gear 6, which is fixed in place, preferably with respect to the body.
  • the fixation can take place, for example, on a tube piece which is arranged coaxially to the shaft 1 and is connected to the ring gear 6 on outer fastening zones 7, or else on the end face on the outside of the ring gear.
  • the rotating steering shaft 1 or the housing 3 is rotatably mounted relative to the torsion-fixed ring gear 6 via a further bearing 10.
  • the bearing 10 is also preferably designed as a rolling bearing, for example as a ball bearing.
  • the coaxial pipe section 26 is additionally and advantageously mounted with a slide bearing 12 relative to the steering shaft 1.
  • the surface of the steering shaft 1 can be provided with a bearing bush 20 in the bearing area.
  • the housing 3 must be designed in the radial direction to the shaft axis la so that the planet gears 8, 8 'freely emerge from the peripheral part of the housing 3 in order to be able to engage with the internal toothing 19 of the ring gear 6.
  • the housing 3 is designed such that corresponding recesses in the radial 22 in the housing 22 enable this passage of the planet wheels 8, 8 '.
  • the steering shaft 1 together with the housing 3 surrounds the shaft axis 1 a in this way, or in this way the tubular steering shaft 1 is interrupted in the area of the drive unit 30, 40 until it continues with the output means 2.
  • the arrangement relative to the steering shaft 1 is provided with a clutch, so that if the -7- Steering aid or if this is not in operation, normal steering is possible without great effort.
  • the arrangement according to the invention allows a coupling to be implemented in a simple manner. If the ring gear is arranged to be displaceable in the axial direction with respect to the shaft axis la in the direction of the steering wheel, the engagement of the ring gear 6 with the planet wheels 8, 8 'can be separated in a simple manner. This is possible in a simple manner if the ring gear 6 is displaceably mounted in the axial direction and is provided with appropriate drive means. For example, these can be mechanical adjustment means or, preferably, electrical adjustment means, such as lifting magnets, which, for example, retract the ring gear biased by a spring.
  • the sun gear or the pinion of the planetary gear 40 is arranged on the rotor shaft 13 of the drive motor 30 and is rotatably mounted 11, 15 in the direction of the shaft axis la.
  • the rotor 17 of the electric motor 30 is fastened to the rotor shaft 13, for example with a holding flange.
  • the rotor shaft 13 is advantageously axially secured with a thrust bearing 21 with respect to the housing cover 4.
  • the rotor rotates between two stators 18, 18 'arranged in the housing 3 and preferably accommodates permanent magnets. High torques, quick response and a small design can be achieved in particular if the drive motor is designed as a disc rotor motor.
  • a brushless or an electronically commutated DC motor ensures the high level of operational safety required by steering aids.
  • Disk rotor motors which contain permanent magnets of high energy density in particular on the rotor disk 17, are particularly suitable for the present application.
  • permanent magnets are -8- Rarely earth magnets like cobalt samarium or neodymium.
  • the motor drive is operated, for example, via modern chopper controls, which, for example, allow the response behavior to be adapted to the needs of the vehicle driver.
  • Such systems can be operated with extremely high efficiency.

Landscapes

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

Abstract

L'invention concerne un dispositif d'assistance de direction pour véhicules automobiles, comportant une unité d'entraînement (30, 40) disposée coaxialement par rapport à l'axe d'arbre de direction (1a) et constituée d'une association d'un moteur électrique (30) discoïde avec un engrenage planétaire (40), lequel assure une liaison active entre le rotor (17) du moteur (30) et l'arbre de direction (1), l'arbre de direction (1) étant interrompu le long de son axe par l'unité d'entraînement (30, 40), ou bien l'arbre de direction (1) entourant l'unité d'entraînement. Cette conception imbriquée autorise une structure extrêmement compacte qui permet un rendement élevé et est économique à réaliser, et qui permet également, dans le sens axial par rapport à l'axe d'arbre de direction (1a), une course de déplacement supplémentaire pour des moyens d'absorption d'énergie en cas de collision.
PCT/CH1999/000143 1998-05-01 1999-04-08 Dispositif d'assistance electrique de direction WO1999057000A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH989/98 1998-05-01
CH98998 1998-05-01

Publications (1)

Publication Number Publication Date
WO1999057000A1 true WO1999057000A1 (fr) 1999-11-11

Family

ID=4199882

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1999/000143 WO1999057000A1 (fr) 1998-05-01 1999-04-08 Dispositif d'assistance electrique de direction

Country Status (1)

Country Link
WO (1) WO1999057000A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3042330A1 (fr) * 2015-10-12 2017-04-14 Whylot Direction assistee de vehicule automobile avec un moteur electromagnetique a flux magnetique axial et une alimentation electrique des stators du moteur se faisant en parallele a redondance
EP3225506A1 (fr) * 2016-03-29 2017-10-04 Showa Corporation Dispositif de direction

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124790A1 (fr) * 1983-05-05 1984-11-14 The Bendix Corporation Mécanisme de direction à assistence électrique
WO1998012097A1 (fr) * 1996-09-18 1998-03-26 Krupp Presta Ag Dispositif de direction electriquement assistee

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124790A1 (fr) * 1983-05-05 1984-11-14 The Bendix Corporation Mécanisme de direction à assistence électrique
WO1998012097A1 (fr) * 1996-09-18 1998-03-26 Krupp Presta Ag Dispositif de direction electriquement assistee

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3042330A1 (fr) * 2015-10-12 2017-04-14 Whylot Direction assistee de vehicule automobile avec un moteur electromagnetique a flux magnetique axial et une alimentation electrique des stators du moteur se faisant en parallele a redondance
FR3042329A1 (fr) * 2015-10-12 2017-04-14 Whylot Direction assistee de vehicule automobile avec un moteur electromagnetique a flux magnetique axial
WO2017064375A1 (fr) 2015-10-12 2017-04-20 Whylot Sas Direction assistée de véhicule automobile avec un moteur électromagnétique à flux magnétique axial et une alimentation électrique des stators du moteur se faisant en parallèle à redondance
CN108141122A (zh) * 2015-10-12 2018-06-08 万络机电公司 具有轴向磁通量电磁电动机以及用于电动机的定子的并联冗余电源的机动车辆的动力转向系统
EP3225506A1 (fr) * 2016-03-29 2017-10-04 Showa Corporation Dispositif de direction

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