EP3512756A1 - Lenkvorrichtung für ein fahrzeug - Google Patents
Lenkvorrichtung für ein fahrzeugInfo
- Publication number
- EP3512756A1 EP3512756A1 EP17749446.5A EP17749446A EP3512756A1 EP 3512756 A1 EP3512756 A1 EP 3512756A1 EP 17749446 A EP17749446 A EP 17749446A EP 3512756 A1 EP3512756 A1 EP 3512756A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steering
- lever
- steering device
- push rod
- actuator
- 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- Withdrawn
Links
Classifications
-
- 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
- B62D7/08—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in a single plane transverse to the longitudinal centre line of the vehicle
- B62D7/09—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in a single plane transverse to the longitudinal centre line of the vehicle characterised by means varying the ratio between the steering angles of the steered wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
- B60G7/006—Attaching arms to sprung or unsprung part of vehicle, characterised by comprising attachment means controlled by an external actuator, e.g. a fluid or electrical motor
-
- 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
- B62D7/18—Steering knuckles; King pins
-
- 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
- B62D7/20—Links, e.g. track rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2200/00—Indexing codes relating to suspension types
- B60G2200/40—Indexing codes relating to the wheels in the suspensions
- B60G2200/44—Indexing codes relating to the wheels in the suspensions steerable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2200/00—Indexing codes relating to suspension types
- B60G2200/40—Indexing codes relating to the wheels in the suspensions
- B60G2200/462—Toe-in/out
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/14—Mounting of suspension arms
- B60G2204/148—Mounting of suspension arms on the unsprung part of the vehicle, e.g. wheel knuckle or rigid axle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
- B60G2204/423—Rails, tubes, or the like, for guiding the movement of suspension elements
- B60G2204/4232—Sliding mounts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/50—Constructional features of wheel supports or knuckles, e.g. steering knuckles, spindle attachments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/40—Steering
- B60G2500/42—Sensibility
Definitions
- the invention relates to a steering device for a vehicle, in particular for a car or commercial vehicle.
- the field of application of the invention extends to both independent and solid axles of vehicles.
- rack and pinion steering systems In the use of independent wheel suspensions in passenger cars and commercial vehicles, such as tractor units, rack and pinion steering systems are used.
- the rack and pinion steering system comprises a linear actuator which is connected via tie rods to the suspension.
- the rack-and-pinion steering system Due to the system, the rack-and-pinion steering system has a very strongly changing transmission ratio between the actuator and the wheel movement. Due to the extension in the end positions, a comparatively large actuator force is required here. Therefore, the actuator performance is designed so that the Aktuatorkraft sufficient for the initiation of a maximum steering angle, although the occurring at the steering axis of the wheel torque behaves almost constantly above the steering angle.
- DE 10 2006 052 252 A1 discloses an independent wheel suspension for a motor vehicle, in which at least one first and at least one second link are each articulatedly coupled to a wheel carrier carrying a vehicle wheel.
- the independent suspension has compensation means for correcting wheel positions, wherein at least the first and the second link have a compensation means or are connected to a compensation means and at least two compensation means of each wheel are interconnected by at least one coupling member.
- the invention has for its object to further develop a steering device for a vehicle, in particular, a steering kinematics of the steering device to be improved.
- the steering apparatus for a vehicle comprises an actuator which is provided to act on a push rod with an axial force, wherein the push rod is hingedly connected on both sides with a respective tie rod, and wherein the respective tie rod is pivotally connected to a respective toggle lever, said respective toe lever for rotating a respective wheel of a vehicle axle about a respective steering axis in accordance with an axial movement of the push rod is operatively connected to a respective wheel and at least a first and a second lever portion, wherein the two lever portions of the respective toggle lever are axially displaced from each other to a gear ratio to change the steering device during a steering of the wheels and to lower the axial force on the actuator.
- the actuator performance can be made smaller, the power reduction of the actuator is accompanied at the same time with a weight reduction and cost reduction.
- the actuator is designed to be particularly compact.
- the solution according to the invention offers greater design freedom through the selection of the respective translation. In particular, thereby also a steering angle error can be reduced.
- the first lever arm is received axially movable in the second lever arm of the respective steering lever.
- the axial length of the respective toggle lever changes. Moving the two lever arms of the respective steering lever axially apart extends the respective track lever. In contrast, shifts the displacement of the two lever arms of the respective toggle lever axially against each other the respective track lever.
- two articulated interconnected components such as the push rod and the tie rod, are movably connected to each other and have at least one degree of freedom.
- the push rod and the respective tie rod are connected to each other by means of a ball joint.
- the respective tie rod is connected by means of a ball joint or by means of a rubber bearing with the respective track lever.
- Actively connected is to be understood that two elements can be directly connected to each other, or there are other elements between two elements, for example, one or more waves, tie rods or similar elements.
- the invention includes the technical teaching that the first lever portion of the respective toggle lever has a pin, wherein the respective pin is received and guided in a groove formed on the respective wheel carrier.
- the first lever portion of the respective toggle lever is pivotally received on the respective tie rod, wherein the second lever portion of the respective toggle lever is operatively connected to the respective wheel carrier.
- the respective groove is formed on the respective wheel carrier or on a respective steering knuckle, which is provided to receive the pin formed on the first lever portion of the respective toggle lever and to guide controlled.
- the respective pin protrudes radially out of the respective toggle lever and is displaceably mounted along the respective groove provided for this purpose.
- the respective groove is formed by milling.
- the groove is formed linearly on the respective wheel carrier.
- the pin received in the respective groove is guided linearly along a straight line.
- the groove is formed curved on the respective wheel carrier. Consequently, the pin received in the respective groove is guided along a curve.
- a curved trained groove changes from one linearly formed groove in an axial movement of the two lever sections not only the length of the respective toggle lever, but also the direction of the respective toggle lever.
- the respective direction is determined by the curvature of the groove and preferably at least partially describes a circular path.
- the respective track lever is linear. Furthermore, it is also conceivable to form the respective track lever curved.
- a curved trained track lever changes with respect to a linearly formed track lever in an axial movement of the two lever sections not only the length of the respective toggle lever, but also the direction of the respective toggle lever.
- the respective direction is determined by the curvature of the track lever and preferably at least partially describes a circular path.
- the curved design of the respective toggle lever or the respective groove allows a targeted adjustment of a deviation from the ideal steering difference angle according to Ackermann.
- the minimization of a so-called steering error is made possible, which goes hand in hand with an approximation of the ideal steering difference angle according to Ackermann.
- An approximation of the ideal steering differential angle according to Ackermann reduces tire wear and rolling resistance in curves.
- an increasing deviation from the steering difference angle according to Ackermann reduces the turning circle of the vehicle.
- the wheels Since the two wheels of a steering axle run on different curve radii, the wheels have different Ackermann angles.
- the steering angle on a curve-inward wheel is greater than the steering angle on a curve-outside wheel.
- the steering angle difference according to Ackermann increases with increasing steering angle.
- the respective steering angle at the respective wheel can be adjusted in a targeted manner by means of the shaping of the respective toggle lever or by means of the shaping of the respective groove on the wheel carrier, in particular independently of one another.
- the independence of the inside and outside of the bend wheel allows it to deviate specifically the outside wheel from the Ackermann angle, to improve the driving dynamics of the vehicle. Consequently, the design of the respective groove directly influences the steering movement of the respective wheel.
- the invention includes the technical teaching that the actuator is operatively connected to an input shaft, wherein the actuator is provided to convert a rotational movement of the input shaft into a translational movement of the push rod.
- a translational movement is meant a linear movement in the longitudinal direction of the push rod.
- the input shaft is at least indirectly connected to a steering handle, preferably a steering wheel.
- the steering movement of the steering handle is converted via the steering device into a steering movement of the vehicle.
- the rotational movement of the input shaft is converted via the actuator in the translational movement of the push rod, wherein the push rod on the respective articulated lever associated, the respective articulated tie rod and the respective articulated associated toe lever with the respective suspension and thus with the respective wheel of the steerable vehicle axle cooperates.
- the input shaft may be mechanically, electrically, pneumatically or hydraulically coupled to the push rod via the actuator.
- the mechanical coupling is preferably realized via a gear-rack combination due to the ease of manufacture.
- a gear-rack combination is located on the input shaft, a first gear, which meshes with a rack arranged on the rack.
- a rotation of the input shaft causes a rotation of the gear, which is in meshing engagement with the rack, whereby the rack is axially displaced together with the push rod.
- the push rod is designed as a rack and thus integrally integrated into the push rod.
- the electrical coupling of the input shaft with the push rod may be such that a sensor is arranged on the input shaft, which detects a rotation of the input shaft.
- an actuator is arranged on the push rod, which can move the push rod axially, wherein the actuator at a detection of rotation of the input shaft is driven by the sensor to move the push rod accordingly.
- one or more valves are arranged as sensors on the input shaft.
- a pressure medium is introduced into two arranged on the push rod working cylinder, whereby ever a piston rod of the working cylinder off or retracts.
- the piston rod is in turn connected to the push rod, whereby it is displaced axially when extending or retracting the piston rods.
- FIG. 1 is a greatly simplified schematic plan view of a steering device according to the invention with two length-adjustable toggle lever,
- Fig. 2 is a schematic sectional view of the toggle lever according to the invention shown in FIG. 1, and
- FIG. 3 shows a further schematic sectional view of the toggle lever according to the invention according to FIG. 1.
- a steering device for a - not shown here - vehicle on an actuator 1, which is operatively connected to an input shaft 11 and a push rod 2.
- the actuator 1 is provided to a rotational movement of the input shaft 11 in a translational movement of the
- the two wheels 8a, 8b are part of a vehicle axle 9 and are moved in accordance with a rotational movement at the input shaft 11 via the steering device at least partially rotated about a respective steering axis 13a, 13b.
- the actuator 1 is provided to pressurize the push rod 2 with an axial force.
- the push rod 2 is formed in one piece and has two distal ends.
- the push rod 2 is articulated at the respective distal end with a respective tie rod 5a, 5b, wherein between the respective tie rod 5a, 5b and the push rod 2, a respective ball joint 12a, 12b is arranged.
- the respective tie rod 5a, 5b is pivotally connected to a respective track lever 6a, 6b, wherein between the respective tie rod 5a, 5b and the respective track lever 6a, 6b, a respective ball joint 12c, 12d is arranged.
- the respective track lever 6a, 6b is operatively connected to a respective wheel carrier 7a, 7b for rotating a respective wheel 8a, 8b of a vehicle axle 9 about the respective steering axle 13a, 13b in accordance with an axial movement of the push rod 2. Furthermore, the respective track lever 6a, 6b on a first and a second lever portion 10a, 10b, 10a ', 10b', wherein the two lever portions 10a, 10b, 10a ', 10b' of the respective toggle lever 6a, 6b are axially against each other, to to change a gear ratio of the steering device during a steering of the wheels 8 a, 8 b and to lower the axial force on the actuator 1.
- the respective length-adjustable track lever 6a, 6b generates a planar transmission ratio, which is constant over an entire steering angle, on the steering device. The steering kinematics of the steering device is significantly improved.
- FIGS. 2 and 3 show an enlarged view of the track levers 6a, 6b, which are shown only greatly simplified in FIG. Although only one of the two track levers 6a, 6b is shown in FIGS. 2 and 3, the description applies to both track levers 6a, 6b.
- the two track levers 6a, 6b are identical and thus constructed identical. According to FIGS.
- the first lever section 10a, 10a 'of the respective toggle lever 6a, 6b has a pin 3a, 3b, the pin 3a, 3b being received and guided in a groove 4a, 4b formed on the respective wheel carrier 7a, 7b ,
- the respective wheel carrier 7a, 7b rotates in accordance with an axial movement of the push rod 2 about the respective steering axis 13a, 13b.
- the respective groove 4a, 4b on the respective wheel carrier 7a, 7b is curved. Due to the curved configuration of the respective groove 4a, 4b, a steering error is minimized, and associated therewith also the tire wear and the rolling resistance of the vehicle are lowered.
- the respective track lever 6a, 6b is linear.
- both the first lever portion 10a, 10a 'of the respective toggle lever 6a, 6b and the second lever portion 10b, 10b' of the respective toggle lever 6a, 6b linear and thus formed straight.
- the invention is not limited to the preceding embodiment. Further training opportunities can be found in the description and the claims.
- individual articulated connections can also be realized via rubber bearings.
- other articulated connection possibilities are conceivable which have at least one degree of freedom.
- the groove 4a, 4b may be formed linearly on the respective wheel carrier 7a, 7b.
- the respective track lever 6a, 6b may be curved.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016217782.6A DE102016217782A1 (de) | 2016-09-16 | 2016-09-16 | Lenkvorrichtung für ein Fahrzeug |
PCT/EP2017/069983 WO2018050359A1 (de) | 2016-09-16 | 2017-08-08 | Lenkvorrichtung für ein fahrzeug |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3512756A1 true EP3512756A1 (de) | 2019-07-24 |
Family
ID=59564183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17749446.5A Withdrawn EP3512756A1 (de) | 2016-09-16 | 2017-08-08 | Lenkvorrichtung für ein fahrzeug |
Country Status (5)
Country | Link |
---|---|
US (1) | US20190359255A1 (de) |
EP (1) | EP3512756A1 (de) |
JP (1) | JP2019531960A (de) |
DE (1) | DE102016217782A1 (de) |
WO (1) | WO2018050359A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019219393B4 (de) * | 2019-12-11 | 2021-12-02 | Robert Bosch Gmbh | Radlenkwinkelstellvorrichtung zur Änderung eines Radlenkwinkels eines Fahrzeugrads |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004053725A1 (de) * | 2004-11-06 | 2006-05-11 | Zf Friedrichshafen Ag | Fahrzeug mit wenigstens einer lenkbar ausgeführten Fahrzeugachse |
DE102006052252A1 (de) | 2006-11-03 | 2008-05-08 | Zf Friedrichshafen Ag | Einzelradaufhängung |
DE102007023907A1 (de) * | 2007-05-23 | 2008-12-04 | Kreyer, Norbert, Dipl.-Ing. | Radaufhängung mit Sturzverstellung |
-
2016
- 2016-09-16 DE DE102016217782.6A patent/DE102016217782A1/de not_active Withdrawn
-
2017
- 2017-08-08 EP EP17749446.5A patent/EP3512756A1/de not_active Withdrawn
- 2017-08-08 WO PCT/EP2017/069983 patent/WO2018050359A1/de unknown
- 2017-08-08 US US16/332,883 patent/US20190359255A1/en not_active Abandoned
- 2017-08-08 JP JP2019515285A patent/JP2019531960A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
DE102016217782A1 (de) | 2018-03-22 |
JP2019531960A (ja) | 2019-11-07 |
WO2018050359A1 (de) | 2018-03-22 |
US20190359255A1 (en) | 2019-11-28 |
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