Actuator for generating an additional steering angle for road vehicles
First Claim
Patent Images
1. A vehicle steering system comprising:
- components for setting a primary steering angle of a vehicle in response to manual operation by a driver; and
an actuator for generating an additional steering angle for the vehicle, said actuator comprising;
a microprocessor;
an electric motor connected to be controlled by said microprocessor and functioning as a drive; and
a gear driven by said electric motor to apply the additional steering angle to at least one axle of the vehicle, wherein said actuator generates the additional steering angle independently of any manual operation by the driver, wherein said gear is a constant-pitch planetary rolling-contact threaded-spindle gear (12) and comprises a spindle rod (16), a spindle nut (14) surrounding the spindle rod, and a plurality of rollers (18) placed around the spindle rod (16), said rollers (18) having a groove profile (19) matching a thread (17) of the spindle (16), said rollers (18) being run on a plurality of guide rings (20) and interposed bearings (22), said rollers (18) being arranged at a fixed distance relative to the spindle nut (14) and from one another.
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Accused Products
Abstract
To create an additional steering angle for a vehicle, an actuator having a microprocessor-controlled electric motor functioning as the drive and a gear driven by said electric motor, is used to apply to the wheels the additional steering angle at the vehicle axle. The gear is a known constant-pitch planetary rolling-contact threaded-spindle gear (constant-pitch PRCTS gear) (12), consisting of a spindle rod (16), a spindle nut (14) surrounding the former, and a number of interposed rollers or rolling elements (18) with a groove profile (19) matching the thread (17) of the spindle rod (16). The rollers or rolling elements (18) are run on a number of guide rings (20) and interposed bearings (20), and placed at a fixed predetermined distance relative to the spindle nut (14) and to one another.
The spindle rod (16) concurrently functions as the axis of the electric motor and is placed inside an electric motor rotor (9′). The constant-pitch PRCTS gear (12) furthermore has assigned sensor means with control-engineering type feedback to determine the position of the spindle rod (12).
33 Citations
4 Claims
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1. A vehicle steering system comprising:
-
components for setting a primary steering angle of a vehicle in response to manual operation by a driver; and
an actuator for generating an additional steering angle for the vehicle, said actuator comprising;
a microprocessor;
an electric motor connected to be controlled by said microprocessor and functioning as a drive; and
a gear driven by said electric motor to apply the additional steering angle to at least one axle of the vehicle, wherein said actuator generates the additional steering angle independently of any manual operation by the driver, whereinsaid gear is a constant-pitch planetary rolling-contact threaded-spindle gear (12) and comprises a spindle rod (16), a spindle nut (14) surrounding the spindle rod, and a plurality of rollers (18) placed around the spindle rod (16), said rollers (18) having a groove profile (19) matching a thread (17) of the spindle (16), said rollers (18) being run on a plurality of guide rings (20) and interposed bearings (22), said rollers (18) being arranged at a fixed distance relative to the spindle nut (14) and from one another. - View Dependent Claims (2, 4)
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3. A vehicle steering system comprising:
-
components for setting a primary steering angle of a vehicle in response to manual operation by a driver; and
an actuator for generating an additional steering angle for the vehicle, said actuator comprising;
a microprocessor;
an electric motor connected to be controlled by said microprocessor and functioning as a drive; and
a gear driven by said electric motor to apply the additional steering angle to at least one axle of the vehicle, wherein said actuator generates the additional steering angle independently of any manual operation by the driver, whereinsaid gear is a planetary rolling-contact threaded-spindle gear (12′
), comprising;
a spindle rod (16′
) with a thread (17′
), which is surrounded by a spindle nut (14′
) with a guide profile (13″
) and a plurality of interposed rollers (18′
) respectively having a first groove profile (19′
) matching the thread (17′
) of the spindle rod (16′
), and a second profile (13′
) matching the guide profile (13″
) of the spindle nut (14′
), each said groove profile overlapping one another and being formed in alternating sections and said rollers (18′
) being placed at a fixed distance relative to the spindle nut and to one another, andsaid actuator further comprises a sensor means with control-engineering type feedback assigned to the planetary rolling-contact spindle gear (12′
) to determine a position of the spindle rod (16′
).
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Specification
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- Resources
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Current AssigneeDeutsches Zentrum Fur Luft- und Raumfahrt EV
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Original AssigneeDeutsches Zentrum Fã¼R Luft- Und Raumfahrt E.V.
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InventorsWillberg, Bertram, Ackermann, Jürgen, Bünte, Tilmann, Dietrich, Johannes, Gombert, Bernd
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Primary Examiner(s)Olszewski, Robert P.
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Assistant Examiner(s)CUFF, MICHAEL A
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Application NumberUS09/192,491Time in Patent Office1,176 DaysField of Search180/444, 180/443, 74/891.5, 744/248.R, 744/59US Class Current180/444CPC Class CodesB62D 1/166 Means changing the transfer...B62D 3/02 mechanicalB62D 5/008 Changing the transfer ratio...B62D 5/0451 Roller spindle drivesB62D 6/04 responsive only to forces d...B62D 7/20 Links, e.g. track rods mean...F16H 25/2252 Planetary rollers between n...
