EP3692278A1 - Actionneur de direction, notamment pour direction d'essieu arrière d'un véhicule à moteur - Google Patents

Actionneur de direction, notamment pour direction d'essieu arrière d'un véhicule à moteur

Info

Publication number
EP3692278A1
EP3692278A1 EP18772765.6A EP18772765A EP3692278A1 EP 3692278 A1 EP3692278 A1 EP 3692278A1 EP 18772765 A EP18772765 A EP 18772765A EP 3692278 A1 EP3692278 A1 EP 3692278A1
Authority
EP
European Patent Office
Prior art keywords
spindle
actuator according
connecting member
actuator
housing
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.)
Withdrawn
Application number
EP18772765.6A
Other languages
German (de)
English (en)
Inventor
Henning Schwenke
Dirk Graeuler
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen 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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP3692278A1 publication Critical patent/EP3692278A1/fr
Withdrawn legal-status Critical Current

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
    • B62D5/0442—Conversion of rotational into longitudinal movement
    • B62D5/0445—Screw drives
    • 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
    • B62D5/0424—Electric motor acting on or near steering gear the axes of motor and final driven element of steering gear, e.g. rack, being parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/06—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins
    • B62D7/14—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering
    • B62D7/15—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering characterised by means varying the ratio between the steering angles of the steered wheels
    • B62D7/1581—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering characterised by means varying the ratio between the steering angles of the steered wheels characterised by comprising an electrical interconnecting system between the steering control means of the different axles
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2037—Actuator supports or means for fixing piston end, e.g. flanges

Definitions

  • Actuator of a steering in particular for a rear axle steering of a motor vehicle
  • the invention relates to an actuator according to the preamble of claim 1 and a use of the actuator.
  • a servo motor also called actuator or short actuator
  • the actuator is mounted centrally on the axle of the motor vehicle and at the same time acts on the steering of the two rear wheels.
  • the actuator has a spindle drive, consisting of spindle and spindle nut, which is rotatably mounted in the housing and axially fixed.
  • the spindle nut is driven by an electric motor and causes an axial displacement of the spindle to one side or the other.
  • the spindle has an approximately centrally disposed threaded portion with a movement thread, which is in engagement with the spindle nut, and two conical spindle ends, which are each connected via a threaded sleeve with a bearing sleeve, which in turn are slidably guided in the housing.
  • joint forks are arranged for connection to a steering linkage. A problem with such actuators can occur when transverse forces act on the joint forks and thus also on the bearing pins, wherein the transverse forces can exert bending moments on the spindle, so that it comes to the spindle to increased stress.
  • An object of the present invention is to make the actuator of a steering or the spindle drive, in particular the spindle and its connection to the yoke claim more stress.
  • the invention comprises the features of the independent claims. Advantageous embodiments emerge from the subclaims.
  • an actuator has a steering, a housing and a spindle drive arranged in the housing.
  • the spindle drive has a spindle engaging with a spindle nut with at least one attachment end.
  • at least one bearing pin which is displaceably arranged in the housing and which is connected to the at least one fastening end of the spindle.
  • At least one joint connecting piece is provided, which is arranged outside the housing and connected to the at least one bearing journal, wherein within the bearing pin, which is hollow, a connecting member is arranged, which is connected on the one hand with the spindle and on the other hand with the joint connector.
  • the spindle is thus not - as in the prior art - connected via the bearing journal with the joint connector, in particular a yoke, but indirectly via the connecting member, which can be designed to claim.
  • the connecting member can be adapted in terms of its structural design to increased bending stresses.
  • the connecting member has a flexurally soft region, which is preferably designed as a cross-sectional constriction or constriction.
  • a "desired bending point" is created in which bending is permitted when bending moments which are introduced via the hinged fork occur. reduced especially in the edge fiber area, whereby the service life of the connecting member is increased.
  • the cross-sectional constriction is formed as an annular groove, preferably with a semicircular shape, whereby the cross-section is reduced continuously and voltage peaks are avoided.
  • an annular groove can be produced, for example, by forming by means of a round profile.
  • the bearing pin is cup-shaped, ie it has a bottom and a cylindrical shell and is open on the opposite side of the ground. From the open side, the connecting link can be inserted into the jacket.
  • the bottom has an opening or a through-hole, in which the spindle is received, preferably with an interference fit.
  • the spindle passes through the opening and protrudes with its threaded fastening end into the cavity of the journal.
  • the connecting member has a first threaded blind hole into which the fastening end of the spindle is screwed. For a solid connection between the spindle and the connecting member is made.
  • the connecting member coaxial with the first threaded blind hole, a second threaded blind hole, in which a fastening bolt is screwed, which connects the joint connector with the connecting member.
  • the second threaded blind hole on an annular flange, d. H. an approximately annular flat bearing surface, which is braced with a corresponding bearing surface of the joint connector.
  • This connection between the annular flange and articulated joint or joint fork by means of the fastening bolt is designed such that not only tensile and compressive forces in the axial direction, but in particular also bending moments can be transmitted.
  • the bending moments result from the introduction of force via the joint connector, preferably by a yoke, which is connected to a steering linkage.
  • the connecting member and the joint connector on the one hand and the jacket of the journal on the other hand leave a game in both the radial and in the axial direction. This ensures that the outgoing from the yoke bending moment is only introduced into the connecting member, and not in the mantle of the journal, which is thus not subjected to bending.
  • the link including joint connector and the jacket of the journal are thus decoupled with respect to the bending stress.
  • bearing journal in particular its jacket is formed rigid. This ensures that between the outer circumference of the bearing pin, which is guided in a plain bearing of the housing, a constant bearing clearance is maintained and no clamping occurs.
  • the spindle has a notch or slight cross-sectional constriction in the region between the bottom of the bearing journal and the connecting member or its screwed fastening end, whereby a further flexible point, however, is created in the spindle. In this area, therefore, a controlled bending is also allowed in order to reduce the stresses.
  • the aforementioned actuator of a steering is preferably used in a steer-by-wire steering, preferably in a rear axle steering of a motor vehicle. Since the rear axle steering in the motor vehicle is a safety-relevant system, an increased resistance to breakage and a prolonged service life of the spindle and connecting member have a particularly advantageous effect.
  • Steer-by-wire steering systems are preferably operated electromechanically and have no direct or direct mechanical connection to the steering wheel of the driver.
  • the steering is enabled via one or more actuators, which generate the steering movement due to electrical control signals. Since the steering is almost done via a cable is spoken by steer-by-wire. A faultless function of the actuator of the steering is therefore to ensure over the entire vehicle life.
  • the term cable is to be understood in this context only as a synonym, since the steering or control signals via a Bus system, such as CAN bus, or at least partially wirelessly can be transmitted.
  • Fig. 2 shows an inventive arrangement of spindle, journals and
  • Fig. 1 shows a known actuator 1, also called servomotor 1, with a housing 2 which is fixed to an axle of a motor vehicle and two diametrically opposed joint forks 3, 4, also generally referred to as joint connectors 3, 4, for connection with not Having shown track control.
  • the actuator 1 comprises a spindle drive with an axially displaceable spindle 5, which can be driven via a spindle nut 6 by an electric motor 7, d. H. is adjustable.
  • the spindle 5 has in the region of the spindle nut 6 designed as a trapezoidal thread, self-locking movement thread 5a, which is in engagement with a corresponding internal thread 6a of the spindle nut 6.
  • the spindle 5 Upon rotation of the spindle nut 6 performs the spindle 5, which is prevented in a manner not shown from twisting, an axial movement (in the drawing) to the right or left.
  • the spindle 5 has two opposite spindle or mounting ends 8, 9, which in turn are fixedly connected to bearing pins 10, 1 1.
  • the bearing pins 10, 1 1 are on the housing side guided in plain bearings 12, 13 and connected by means of bolts 14, 15 with the two joint forks 3, 4.
  • Fig. 2 shows a journal 1 10 according to the invention for an actuator of a rear axle steering for a motor vehicle.
  • the same or analogous parts in FIG. 2 are labeled with the same but increased by 100 reference numerals as in FIG.
  • the journal 1 10 is cup-shaped and has a pot bottom 1 10a, in the following short ground 1 10a called, and a cylindrical shell 1 10b, which has an inner or cavity 1 16 and is guided in a housing-side slide bearing 1 12.
  • a breakthrough 1 17 is arranged, which is penetrated by a spindle 105.
  • the spindle 105 has a mounting end 108 with a thread 108a.
  • An articulated joint 104 designed as a joint fork 104 is partially, ie shown in its fastening region - the joint fork 104 forms the connection to an unillustrated steering linkage for a rear wheel of the motor vehicle.
  • the yoke 104 has a through hole 104 a, which is penetrated by a fastening bolt 1 14.
  • a connecting member 1 18 is arranged, which has a first threaded blind hole 1 19 in a coaxial arrangement and a second threaded blind hole 120 on the opposite end.
  • the connecting member 1 18 has at its front end in the region of the second threaded blind hole 120 has an annular flange 121 with an approximately circular-shaped bearing surface 121 a.
  • the connecting member 1 18 a flexurally soft region 122, which has a reduced diameter and a reduced area moment of inertia compared to the adjacent areas.
  • the flexurally soft region 122 is formed as a constriction or circumferential notch with an approximately semi-circular profile, so that a gradual reduction in diameter is achieved.
  • the connecting member 1 18 is connected on the one hand to the fastening end 108 of the spindle 105 and on the other hand by means of the fastening bolt 1 14 with the yoke 104. In this case, the fastening region 108 is screwed into the first threaded blind hole 1 19.
  • the spindle 105 is preferably received in the through hole 1 17 of the bottom 1 10a with a press fit, so that between the spindle 105 and journal 1 10 there is a friction or adhesion.
  • the spindle 105 has a circumferential, rounded notch 105a, which acts as a flexible point.
  • the yoke 104 is firmly clamped over the bolt 1 14 with the support surface 121 a of the annular flange 121, so that there is a rigid connection.
  • a radial clearance s1 and between the end face of the shell 1 10b and the yoke 104 leave an axial clearance s2.
  • the radial play s1 and the axial play s2 have the effect that bending moments introduced by the yoke 104 are transmitted exclusively via the annular flange 121 into the connecting link 118 and are degraded there, in particular in the flexurally soft region 122 and, to a lesser extent, in the notch 105a of FIG Spindle 105.
  • the shell 1 10b which is preferably formed rigid, is thus decoupled with respect to a bending stress from the connecting member 1 18, so that between the outer periphery of the shell 1 10b and the housing-side sliding bearing 1 12 no tilting or jamming occurs.

Abstract

L'invention concerne un actionneur comprenant : un boîtier ; un entraînement à vis qui est disposé dans le boîtier et qui présente une vis (105) en prise avec un écrou et dotée d'au moins une extrémité de fixation (108) ; au moins un tourillon (110) qui est disposé mobile dans le boîtier et qui est relié à au moins une extrémité de fixation (108) de la vis (105) ; au moins une pièce de liaison articulée (104) qui est disposée à l'extérieur du boîtier et est reliée à au moins un tourillon (110). Selon l'invention, l'au moins un tourillon (110) comporte une cavité (116), un organe de liaison (118) est logé dans la cavité (116) et l'organe de liaison (118) est relié d'une part à l'extrémité de fixation (108) de la vis (105), et d'autre part à la pièce de liaison articulée (104).
EP18772765.6A 2017-10-04 2018-09-11 Actionneur de direction, notamment pour direction d'essieu arrière d'un véhicule à moteur Withdrawn EP3692278A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017217629.6A DE102017217629B4 (de) 2017-10-04 2017-10-04 Aktuator einer Lenkung, insbesondere für eine Hinterachslenkung eines Kraftfahrzeuges
PCT/EP2018/074357 WO2019068423A1 (fr) 2017-10-04 2018-09-11 Actionneur de direction, notamment pour direction d'essieu arrière d'un véhicule à moteur

Publications (1)

Publication Number Publication Date
EP3692278A1 true EP3692278A1 (fr) 2020-08-12

Family

ID=63637873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18772765.6A Withdrawn EP3692278A1 (fr) 2017-10-04 2018-09-11 Actionneur de direction, notamment pour direction d'essieu arrière d'un véhicule à moteur

Country Status (3)

Country Link
EP (1) EP3692278A1 (fr)
DE (1) DE102017217629B4 (fr)
WO (1) WO2019068423A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022115460A1 (de) 2022-06-21 2023-12-21 Ewellix AB Linearaktuator und Lenksystem

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014206934B4 (de) 2014-04-10 2022-05-12 Zf Friedrichshafen Ag Stellmotor
DE102015219198B4 (de) * 2015-10-05 2018-05-17 Zf Friedrichshafen Ag Aktuator, insbesondere für eine Hinterachslenkung eines Kraftfahrzeuges
DE102016200101A1 (de) 2016-01-07 2017-07-13 Zf Friedrichshafen Ag Aktuator, insbesondere für die Hinterachslenkung eines Kraftfahrzeuges
DE102016204568A1 (de) * 2016-03-18 2017-09-21 Zf Friedrichshafen Ag Schraubverbindung zwischen einem ersten und einem zweiten Bauteil

Also Published As

Publication number Publication date
DE102017217629B4 (de) 2020-06-04
DE102017217629A1 (de) 2019-04-04
WO2019068423A1 (fr) 2019-04-11

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