Brakes – Operators – Electric
Patent
1998-05-01
1999-12-14
Butler, Douglas C.
Brakes
Operators
Electric
188 111E, 188 718, 188 721, 188162, 188181T, 303 20, B60T 1374
Patent
active
060005076
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a control or adjustment system for a wheel brake operated by an electric motor.
A system of this type is described, for example, in U.S. Pat. No. 4,995,483. The brake concerned is an aircraft brake.
An application force of the wheel brake is determined to satisfy the demand for deceleration of the operator of an aircraft or a vehicle. A servo motor is actuated until a determined adjustment travel of the actuating member is reached, the measurement starting with the first contact of the brake lining with the brake disc.
This provision is not sufficient to sensitively slow down the vehicle. Admittedly, there is a basic relationship between the displacement travel of the adjusting element and the application force. However, the application force may vary due to external influences and, in addition, the brake torque to be achieved is not absolutely linked to the application force.
After it has been fixed that the brake lining is declamped from the brake disc upon release of the brake, the motor is still energized for a certain period of time so that the brake linings are further removed from the brake disc. The clearance which is caused by this action is not defined precisely because the clearance is not specifically linked with the energization time of the motor.
Therefore, the object of the present invention is to provide an improved system of sensitive braking and reliable adjustment of an accurately defined clearance.
SUMMARY OF THE INVENTION
To achieve this objective, the present invention discloses the provision of a first control circuit that adapts the actual displacement travel of the actuating element to the desired value. In addition, a value that characterizes the braking effect is adapted correspondingly to a nominal standard in a second control circuit.
The brake application is now effected by way of the second control circuit, and the clearance is adjusted by way of the first control circuit.
A switch is provided that activates either the first or the second control circuit.
The type of control permits initially adjusting a small clearance when the brake is released and adjusting the full clearance after a certain time only. Repeated brake application immediately after release of the brake will then occur rapidly because no clearance must be overcome.
The present invention will be explained in detail hereinbelow by way of the embodiments of three Figures.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an electromechanically operable floating-caliper disc brake.
FIG. 2 shows a basic electronic circuit for a brake according to the invention.
FIG. 3 shows the control circuit structure of FIG. 2 for the case when deceleration control is activated.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
FIG. 1 shows an electromechanically operable floating-caliper disc brake. Of course, the actuation of the brake that will be described hereinbelow may also be transferred to all other types of disc brakes and drum brakes.
The floating-caliper disc brake includes a brake caliper 1 that is slidably mounted with respect to the brake disc 3, and an electric motor 2 having its housing 8 attached to the brake caliper 1. One friction lining 4, 5 is arranged on either side of the brake disc. The first friction lining 4 is supported on a spindle 14 that is driven by the electric motor 2, with the result that the lining can be pressed against the brake disc 3 by the electric motor 2. The second brake lining 5 is attached to the brake caliper 1 and is pressed against the other side of the brake disc by reaction forces that are transmitted to the caliper 1 when the first lining 4 is applied to brake disc 3. The electric motor 2 is a permanently energized, electronically commutatable motor having a stator 9 rigidly mounted in the housing 8. The stator 9 is configured as a coil system in a known fashion. Rotor 10 includes a hollow shaft 15 that is rotatable in the brake caliper 1. Several permanent magnetic segments 29 are arranged on the outside of the
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Bill Karl-Heinz
Bohm Jurgen
Butler Douglas C.
ITT Manufacturing Enterprises Inc.
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