Brakes – Elements – Locks
Reexamination Certificate
2000-07-14
2001-11-13
Oberleitner, Robert J. (Department: 3613)
Brakes
Elements
Locks
C188S071900, C188S072100, C188S072800, C188S162000
Reexamination Certificate
active
06315092
ABSTRACT:
This invention relates to a disc brake for motor vehicles which can be actuated by means of an electric motor with the interconnection of a reduction gear, provided with an axially movable part, and which includes a brake caliper, two friction linings, each of them cooperating with one lateral surface each of a brake disc and arranged within the brake caliper so as to be displaceable therein to a limited extent, with one of the friction linings being engageable with the brake disc directly by the axially movable part and the other friction lining by the action of a reaction force applied by the brake caliper.
Such an electromechanically actuatable disc brake is known, e.g., from DE 195 11 287 A1. The actuating unit of this known disc brake consists of an electric motor, an actuating element as well as of a reduction gear arranged between electric motor and actuating element. This reduction gear is designed as a threaded roller drive with threaded roller recoil. The axial displacement of the spindle of the threaded roller drive brings the friction lining associated with the actuating element in engagement with the disc brake. The actuating element of the prior-art disc brake is formed by the spindle of the threaded roller drive the threaded nut of which is driven by the electric motor in order to generate a corresponding clamping force. A large-diameter cross-roll bearing arranged within the brake caliper serves to support the threaded nut. What is considered a disadvantage in the known electromechanically actuatable disc brake of prior art is the fact that it does not enable any parking brake function to be realized.
An electrically actuatable disc brake, combined with a parking brake, is known from DE 196 01 983 C1. The electromagnetic actuator of this prior-art disc brake takes care both of the service brake and parking brake functions. The clamping or arresting function of this brake is realized in that a metal pin actuatable by means of an electric magnet is provided with a friction head pressed against the spindle nut of a reduction gear, whereby a friction force is formed which leads to a self-locking action of the clamping device and, hence, to the brake linings' being fixed.
What is to be considered less advantageous in this prior-art brake is the rather large constructional space required to generate a force acting laterally on the threaded nut. A further disadvantage is the fact that the amount of increase of the internal friction is varying a great deal and depends on various environmental conditions such as wear and tear and temperature or the like.
It is thus an object of the present invention to improve an electromagnetically actuatable disc brake of the type mentioned above in that the constructional space required for realizing the clamping or arresting function is kept small while using parts manufacturable at low cost. Moreover, the parking brake function is to be completely independent of environmental conditions as wear and tear and temperature or the like or rather to depend on them to a very small extent, only.
According to this invention, this task is solved in that, a clamping or arresting device is provided which cooperates with a rotating part of the reduction gear or with a part having a power-transmitting connection to the reduction gear so as to lock the latter.
A further reduction of the constructional space and of energy requirements is achieved in an advantageous further development in that the parts cooperating with the clamping or arresting device are parts which transmit small torques when the brake is applied.
In giving the inventive idea a concrete form, it is provided that the clamping or arresting device is constructed as a friction brake or as a locking unit.
A particularly beneficial further development of the subject matter of this invention is characterized in that the clamping or arresting device is formed by a tappet which can be actuated by means of an electromechanical transmitter, preferably by means of an electric lifting magnet, and which cooperates with the rotating part and, preferably in the de-energized condition, cooperates with the rotating part under the prestress of a spring.
In another beneficial further development of this invention, a planetary gear is arranged between electric motor and reduction gear, with the rotating part being a planet carrier carrying the planet wheels of the planetary gear. The planet carrier is provided with at least one recess which the tappet can be introduced into.
Another advantageous embodiment of this invention provides that the rotating part is a threaded nut cooperating with the threaded spindle.
In the first-mentioned embodiment, wherein the clamping or arresting device is constructed as a friction brake, it is particularly advantageous if both the tappet and the rotating part are provided with a friction surface.
In an advantageous further development of the subject matter of this invention, the tappet features a conical design and cooperates with a conical surface provided on the end of the threaded nut which is averted from the friction linings.
In the second-mentioned embodiment, wherein the clamping or arresting device has the design of a locking unit, it is a particular advantage if the tappet is clamped within a recess provided in the rotating part.
In a particularly compact-construction embodiment of the abovementioned type, the tappet includes an angular portion which cooperates with at least one slope surface provided on the rotating part and confining the recess. This measure, in particular, minimizes the stroke and the energy requirements of the abovementioned electric lifting magnet.
REFERENCES:
patent: 3627087 (1971-12-01), Eskridge
patent: 4567967 (1986-02-01), Crossman
patent: 4635491 (1987-01-01), Yamano et al.
patent: 4809824 (1989-03-01), Fargier et al.
patent: 4895227 (1990-01-01), Grenier et al.
patent: 5090518 (1992-02-01), Schenk et al.
patent: 5148894 (1992-09-01), Eddy, Jr.
patent: 5219049 (1993-06-01), Unterborn
patent: 5388674 (1995-02-01), Severinsson
patent: 5549183 (1996-08-01), Buchanan, Jr. et al.
patent: 5829845 (1998-11-01), Maron et al.
patent: 5949168 (1999-09-01), Dieckmann et al.
patent: 5971110 (1999-10-01), Martin
patent: 6000507 (1999-12-01), Bohm et al.
patent: 6059076 (2000-05-01), Dietrich et al.
patent: 6112864 (2000-09-01), Suzuki et al.
patent: 6139460 (2000-10-01), Drennen et al.
patent: 6230855 (2001-05-01), Holding
patent: 195 11 287 (1996-01-01), None
patent: 196 01 983 (1997-07-01), None
patent: 196 21 533 (1997-12-01), None
patent: 196 28 804 (1998-01-01), None
patent: 0 334 434 (1989-09-01), None
patent: 0 398 531 (1990-11-01), None
patent: 89 10 495 (1989-11-01), None
Search Report of the German Patent Office for Application No. 198 04 454.2.
Continental Teves AG & Co. oHG
Oberleitner Robert J.
Pezzlo Benjamin A
Rader & Fishman & Grauer, PLLC
LandOfFree
Electromechanically actuated disc brake does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electromechanically actuated disc brake, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromechanically actuated disc brake will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2576439