DE102016119595A1 - Steering system with single wheel actuators and common housing - Google Patents

Abstract

A steering system for a vehicle is described, comprising: a first actuator (1, 5) driving a first moving means (10), the first moving means (10) steering a first wheel, and a second actuator (1, 5) driving a second movable means (10), the second movable means (10) steering a second wheel, the first wheel being steerable independently of the second wheel, the first and second actuators (1, 5) are arranged in a housing or wherein the first and the second movable means (10) are arranged in a housing or wherein the first and the second actuator (1, 5) and the first and the second movable means (10) within a single housing (9) are arranged.

Description

FIELD OF THE INVENTION

The present invention relates to a steering system for a vehicle and a vehicle.

BACKGROUND OF THE INVENTION

In the prior art steer-by-wire steering systems and steering systems with Einzelradaktuatoren known. For example, steering systems are described in which each steered wheel an actuator is assigned. In addition, axially displaceable components are shown, on which independently act on two actuators to achieve an axial displacement of the component.

SUMMARY OF THE INVENTION

A disadvantage of the prior art is that two decoupled actuators have two separate housings. The housings must each be connected to the vehicle in question. The prerequisite for this is that the vehicle manufacturer provides receiving points for two actuator housings. Alternatively, two actuators can access the same axially displaceable component together. It follows disadvantageously that the individual wheels can be redirected redundant, but only coupled.

One object is therefore to provide a decoupled system such that each steered wheel is assigned an actuator, whereby the wheel angle can be adjusted independently. Furthermore, the system should be arranged in a single housing to the body-mounted arrangement of the steering system to the vehicle.

As a first embodiment of the invention, there is provided a steering system for a vehicle, comprising: a first actuator that drives a first moving means, the first moving means directing a first wheel, and a second actuator driving a second moving means, wherein the second movable means directs a second wheel, wherein the first wheel is steerable independently of the second wheel, wherein the first and the second actuator are arranged in a housing or wherein the first and the second movable means are arranged in a housing or the first and second actuators and the first and second movable means are disposed within a single housing.

The arrangement of the drives of the wheels within a single housing, only for a housing receiving points must be provided to the relevant body.

By arranging a decoupled system in which each wheel is assigned its own actuator, the wheel angles can be set independently. An actuator may essentially comprise an engine and a transmission, wherein the transmission may convert a rotational movement into an axial displacement movement. The gear may be a threaded spindle, a KGT (ball screw), a Wälzgewindespindel or a pinion-rack combination to convert a rotational movement of the shaft of the drive motor in a translational movement. In addition, the transmission may include a transmission precursor in the form of a belt transmission, a planetary gear or a spur gear. The engine may in particular be a hollow shaft motor. The invention has a single housing, wherein the housing is integrally formed or may comprise a plurality of parts. The individual parts are detachably or permanently connected.

By a common housing, the number of receiving points to the body-mounted arrangement on a vehicle can be kept low.

As a second embodiment of the invention, there is provided a vehicle having a front axle and a rear axle, comprising a steering system according to one of claims 1 to 7 for the wheels of the front axle and / or comprising a steering system according to any one of claims 1 to 7 for the wheels of rear axle.

Exemplary embodiments are described in the dependent claims.

According to a further embodiment of the present invention, a steering system is provided, wherein the housing comprises 2, 3, 4, 5, 6 or any number of parts which are detachably or non-detachably connected.

According to an exemplary embodiment of the invention, a steering system is provided, wherein the first movable means and / or the second movable means is a rod guide or a threaded spindle.

In a further embodiment of the invention, a steering system is provided, wherein the first and / or the second movable means by means of a circumferential development, in particular a pinion rack toothing, or a threaded screw nut or a straight-line circular crane transformation, in particular a slotted guide, is driven.

According to another embodiment of the present invention, a steering system for Made available, the housing can be mounted by receiving points on a vehicle.

The arrangement of receiving points can be a releasable fast assembly of the housing to the body.

According to an exemplary embodiment of the invention, there is provided a steering system, the steering system comprising: a third actuator driving a third moving means, the third moving means steering a third wheel, and a fourth actuator driving a fourth moving means wherein the fourth movable means steers a fourth wheel, the third wheel being steerable independently of the fourth wheel, the third and fourth actuators and the third and fourth movable means being disposed within a single housing.

In another embodiment of the invention, a steering system is provided, wherein the first and second and third and fourth actuators and the first and second and third and fourth moving means are disposed within a single housing.

According to an exemplary embodiment of the invention, a vehicle is provided, the vehicle having 2, 3, 4, 5, 6 or any number of wheels, the vehicle having a steering system according to one of claims 1 to 7.

As an idea of the invention may be considered to provide a steering system having two actuators each moving an axially displaceable member operatively connected to a steered wheel. The actuators and the axially displaceable components are arranged in a housing. By arranging in a single housing, the number of necessary attachment points to the body of the vehicle in question can be minimized. An actuator essentially comprises a motor and a transmission, wherein the transmission converts a rotational movement into an axial displacement movement. The actuator provides the axial position of an axially displaceable component which is operatively connected to at least one steered wheel. The transmission makes a conversion from a rotation to a translation. In particular, a threaded spindle, a KGT (ball screw), a Wälzgewindespindel, a combination of pinion with a rack are used. There may be provided an additional gear that translates the rotational motion of the engine. The additional transmission can be designed as a belt transmission, as a planetary gear or as a spur gear.

Of course, the individual features can also be combined with each other, which can also be partially beneficial effects that go beyond the sum of the individual effects.

list of figures

• 1 eine Lenkung mit Spindel und gekoppelten Spurstangen,
• 2 eine weitere Lenkung mit Spindel und gekoppelten Spurstangen,
• 3 eine Lenkung mit Spindel und unabhängig voneinander gekoppelten Spurstangen und einem gemeinsamen Gehäuse,
• 4 eine Lenkung mit Spindel und mit in Grenzen unabhängig voneinander gekoppelten Spurstangen,
• 5 eine weitere Lenkung mit Spindel und mit in Grenzen unabhängig voneinander gekoppelten Spurstangen,
• 6 eine schematische Darstellung einer Umwandlung einer Rotation in eine Translation durch eine Umfangsabwicklung,
• 7 eine schematische Darstellung einer Umwandlung einer Rotation in eine Translation in einer Draufsicht durch eine Umfangsabwicklung,
• 8 eine schematische Darstellung einer Umwandlung einer Rotation in eine Translation mit einer Schraubenlinie,
• 9 eine schematische Darstellung einer Umwandlung einer Rotation in eine Translation in einer Draufsicht mit einer Schraubenlinie,
• 10 eine schematische Darstellung einer Umwandlung einer Rotation in eine Translation mit einer Geraden-/Kreistransformation,
• 11 eine schematische Darstellung einer Umwandlung einer Rotation in eine Translation in einer Draufsicht mit einer Geraden-/Kreistransformation und
• 12 eine schematische Darstellung einer Lenkung mit APA-Riementrieb und mit in Grenzen unabhängig voneinander lenkbaren Rädern und gemeinsamen Gehäuse, wobei das Gehäuse aus mehreren Teilen 19, 20, 21, 22 und 23 zusammengesetzt ist.

Further details and advantages of the invention will become apparent from the embodiments illustrated in the drawings. Show it

• 1 a steering with spindle and coupled tie rods,
• 2 another steering with spindle and coupled tie rods,
• 3 a steering with spindle and independently coupled tie rods and a common housing,
• 4 a steering with spindle and with independently coupled to each other tie rods,
• 5 Another steering with spindle and with independently independently coupled tie rods,
• 6 a schematic representation of a conversion of a rotation in a translation by a circumferential processing,
• 7 a schematic representation of a conversion of a rotation in a translation in a plan view by a peripheral processing,
• 8th a schematic representation of a conversion of a rotation in a translation with a helix,
• 9 a schematic representation of a conversion of a rotation in a translation in a plan view with a helix,
• 10 a schematic representation of a conversion of a rotation into a translation with a straight line / circle transformation,
• 11 a schematic representation of a conversion of a rotation in a translation in a plan view with a straight line / circle transformation and
• 12 a schematic representation of a steering with APA belt drive and with independently steerable within limits wheels and common housing, wherein the housing is composed of several parts 19, 20, 21, 22 and 23.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

1 shows a steering with spindle and coupled tie rods, wherein a common rod guide 3 is provided for the steering of two wheels. There is provided an electric motor, which is a stator 1 and a rotor 5 includes, wherein the rotor 5 A mother 6 a threaded spindle 7 drives. The rod guide 3 is through a rod bearing with twist-lock 8th suspended. The electric motor with rotor 5 and stator 1 and the rod guide 3 is in a common housing 2 accommodated. By arranging only a single housing 2 The number of necessary recording points can be kept low.

2 shows another steering with spindle and coupled tie rods 4 where a tie rod 4 a wheel directly on the threaded spindle 7 is articulated. Advantageously, only one rod bearing is necessary in this embodiment. In addition, this embodiment is compact.

3 shows a steering with spindle and independently coupled tie rods 4 and a common housing 9 wherein the embodiment has two separate rod guides 10 has as moving parts. There will also be two electric motors with rotors 5 and stators 1 provided that the threaded spindle 10 each by means of a mother 6 drive. According to the invention, the two electric motors and the rod guides 10 in a single housing 9 accommodated. Advantageously, therefore, only a few receiving points must be provided so that the Einzelradaktuatoren can be arranged on a body or detachably or permanently attached.

4 shows a steering with spindle and with independently coupled independently of each other tie rods 4 ,

5 shows a further steering with spindle and with independently coupled independently of each other tie rods 4 where a guide rod 12 within a threaded spindle 13 is arranged. This results in a compact design.

6 shows a schematic representation of a conversion of a rotation in a translation in the form of a circumferential development. The electric motor drives the pinion 15 at. The pinion 15 meshes with a toothing of the rack 16 , The rack 16 is moved axially. The rack 16 is operatively connected to at least one steered wheel and moves this according to the degree of freedom provided by the vehicle manufacturer. The electric motor is a hollow shaft motor, wherein its axis of rotation is formed concentrically to the axis of the axially displaceable component. Alternatively, the axis of rotation of the electric motor can be formed axially parallel to the axis of the axially displaceable component (APA). In a further alternative embodiment, the axis of rotation of the electric motor can be arranged askew to the axis of the axially displaceable component (pinion). The translation of the motor to the axially displaceable element may for example be between 0.2 mm / revolution to 10 mm / revolution.

7 shows a schematic representation of a conversion of a rotation in a translation in a plan view in the form of a circumferential development.

8th shows a schematic representation of a conversion of a rotation in a translation in the form of a helix.

9 shows a schematic representation of a conversion of a rotation in a translation in a plan view in the form of a helix.

10 shows a schematic representation of a conversion of a rotation into a translation in the form of a straight line / circle transformation by means of a slotted guide.

11 shows a schematic representation of a conversion of a rotation into a translation in a plan view by means of a straight line / circle transformation.

12 shows a schematic representation of a steering with APA belt drive and with limits independently steerable wheels and common housing 19, 20, 21, 22, 23. From the individual parts 19, 20, 21, 22 and 23 results in a single housing. The individual housing parts 19, 20, 21, 22 and 23 are detachably or non-detachably connected, so that only a few connections to a corresponding body of a vehicle are necessary in order to connect the housing to the vehicle. They are actuators 17 . 18 shown as an engine 18 and straps 17 are formed. In addition, moving means are shown as a ball screw nut 6 , Ball screw 7 and rod guides 3 are formed. The actuators 17 . 18 and the moving means 3 . 6 . 7 are arranged within a housing, which consists of several parts 19, 20, 21, 22 and 23.

The housing may be formed in one piece or assembled. The inventive device may be formed with two actuators for Vorderachs- or rear-axle steering or be formed with four actuators for Vorderachs- and Hinterachslenkung. In an alternative embodiment, the device according to the invention may have three, four, five, six or any number of actuators, each actuator is associated with a steered wheel.

It should be noted that the term "comprising" does not exclude other elements or method steps, just as the term "a" and "an" does not exclude multiple elements and steps.

The reference numerals used are for convenience of reference only and are not to be considered as limiting, the scope of the invention being indicated by the claims.

LIST OF REFERENCE NUMBERS

1

stator

2

casing

3

rod guide

4

tie rod

5

rotor

6

Ball screw nut

7

Ball screw

8th

Bar bearing and anti-rotation lock

9

common housing for two actuators and two moving means

10

mobile means

11

traverse

12

guide rod

13

screw

14

screw

15

pinion

16

rack

17

belt

18

engine

Claims (9)

A steering system for a vehicle, comprising: a first actuator (1, 5) driving a first moving means (10), the first moving means (10) directing a first wheel, and a second actuator (1, 5) engaging second movable means (10) drives, wherein the second movable means (10) steers a second wheel, the first wheel being steerable independently of the second wheel, characterized in that the first and the second actuator (1, 5) in one Housing are arranged or wherein the first and the second movable means (10) are arranged in a housing or wherein the first and the second actuator (1, 5) and the first and the second movable means (10) within a single housing (9 ) are arranged. Steering system after Claim 1 , characterized in that the housing 2, 3, 4, 5, 6 or any number of parts (19, 20, 21, 22, 23) comprises, which are releasably or permanently connected. Steering system according to one of Claims 1 or 2 , characterized in that the first movable means (10) and / or the second movable means (10) is a bar guide or a threaded spindle. Steering system according to one of the preceding claims, characterized in that the first and / or the second movable means (10) by means of a circumferential development, in particular a pinion rack toothing, or a threaded screw nut or a straight-line circular crane transformation, in particular a slotted guide, is driven , Steering system according to one of the preceding claims, characterized in that the housing (9) can be mounted on a vehicle by receiving points. Steering system according to one of the preceding claims, characterized in that the steering system comprises: a third actuator which drives a third moving means, wherein the third moving means steers a third wheel, and a fourth actuator which drives a fourth moving means, wherein the fourth movable means steers a fourth wheel, wherein the third wheel is steerable independently of the fourth wheel, wherein the third and the fourth actuator and the third and the fourth movable means are arranged within a single housing. Steering system after Claim 6 characterized in that the first and second and third and fourth actuators (1, 5) and the first and second and third and fourth moveable means (10) are disposed within a single housing (9). A vehicle having a front axle and a rear axle comprising a steering system according to one of the preceding claims for the wheels of the front axle and / or comprising a steering system according to one of the preceding claims for the wheels of the rear axle. Vehicle after Claim 8 , characterized in that the vehicle 2, 3, 4, 5, 6 or any number of wheels, wherein the vehicle a Steering system according to one of Claims 1 to 7 having.

Images