Brakes – Operators – Electric
Patent
1996-05-29
1998-11-03
Oberleitner, Robert J.
Brakes
Operators
Electric
188 721, 188 727, 310 83, F16D 5516, F16D 5508, H02K 516
Patent
active
058295577
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to disc brakes and more particularly relates to actuated disc brake systems for motor vehicles with brake calipers and an actuating unit.
BACKGROUND OF THE INVENTION
A disc brake of this particular type is known from EP-D394 238 B1. Here, the actuating unit consists of an electric motor working with a planetary gear, and its planetary wheels powering a ring wheel. The ring wheel's rotational motion is transmitted, via bearing elements, to an actuating bush, thus causing its axial displacement or shift which, in return, causes the actuating element's respective friction lining to interact with the disc brake. The electric motor and planetary gear are positioned side by side in the disc brake's path of actuation. One disadvantage of all known, electromechanically actuated, disc brakes is the considerable axial extension of the actuating unit.
It is the intent of the submitted invention to improve on an electromechanical disc brake of the type mentioned above, with special emphasis put on reducing the axial dimensions of the actuating mechanism.
Its conceptual problem is solved in that the electric motor's rotor is of ring-shaped design, radially surrounding the reducing gear. The functionality of such an electromechanically actuated disc brake is unique in its strong dynamics of brake actuation and extremely compact design, allowing the transmission of high-density, mass-intensive braking power.
Practical application of the invention calls for the reducing gear to be a threaded roller pinion, with its threaded nut transmitting power to the rotor. An economically advantageous refinement has the threaded roller pinion designed as one featuring axial return of the rollers. It is of special convenience to have the actuating element represented by the spindle of the threaded roller pinion.
In order to achieve a considerable reduction in the electric motor's required torque, the power exchange between rotor and threaded nut is conducted by means of a planetary gear, with its sun wheel deployed at the rotor, while the planetary wheels are located at the threaded nut. The internal toothing of the brake calipers represents the hollow wheel of the planetary gears, interacting with the planetary wheels. It is of advantage to have available, between rotor and gear nut, a needle bearing and ball bearing configuration, under which the radial external track of the ball bearing is situated in the rotor and the radial internal track is, at least partially, situated in the threaded nut. Such arrangement makes possible a reduction in electric waste and an enlargement of the rotor's angle--quite advantageous for deployment of the threaded spindle as a requirement for the lining's positioning.
The smooth transmission of the electric motor's actuating power is achieved through cooperation of the spindle with a power transmission plate which is installed on the direct-actuated side of the friction lining.
A substantial reduction in efficiency loss, due to friction being present in the threaded roller pinion, is realized by installing a plunger rod (or pressure bar) between the threaded spindle and power transmission plate.
An even transmission of compressive forces between threaded spindle and power transmission plate is achieved by partially installing the plunger rod inside the threaded spindle, and securing it by way of two spherical caps. The first of these is intended to be mounted in the threaded spindle, with the other on the axial extension of the power transmission plate. Ideally, the first of the spherical caps should be mounted at the center point of the threaded spindle's axial length, and/or within the space defined by the spindle's thread rollers.
A further characteristic is the establishment of a connection of torsional strength between thread spindle and the power transmission plate, allowing smooth transmission of torsional momentum resulting from brake application force. It is achieved through the deployment of a metallic bellows between the threaded spindle and power tra
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Balz Jurgen
Bill Karlheinz
Halasy-Wimmer Georg
Kunze Lothar
Schmitt Stefan
ITT Automotive Europe GmbH
Lewis J. Gordon
Oberleitner Robert J.
Schwartz Chris
Twomey Thomas N.
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