Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1993-10-12
1996-12-24
Ballato, Josie
Brakes
Wheel
Axially movable brake element or housing therefor
188 729, F16D 6556, F16D 6516
Patent
active
055866239
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a brake motor comprising: an essentially cylindrical body filled with a hydraulic fluid subjected to a variable pressure; a mechanical actuator comprising a control member which can be accessed from outside this body; a brake piston shutting off the body in leaktight fashion and capable of sliding therein under the effect of the actuator in order to actuate, in turn, at least one friction member; and an automatic adjustment device arranged inside the body between the mechanical actuator and the piston in order to take up the play resulting from the wear of the friction member, this device itself comprising a rotationally fixed elongate nut a first of whose two ends receives a selectively rotary screw which is engaged therein by a first of its two ends, the second end of the nut being capable of receiving a thrust from the mechanical actuator, and the second end of the screw passing through the piston in leaktight fashion in order to be subjected to atmospheric pressure and having a tapered shoulder capable of being selectively rotationally blocked by an internal tapered surface of the piston, rotationally fixed, against which this shoulder is pressed with a force which increases with the pressure of the hydraulic fluid.
BACKGROUND OF THE INVENTION
A brake motor of this type is, for example, known in the prior art from the document EP-A-0,249,522, and is particularly illustrated by FIG. 4 of this document.
Moreover, document FR-A-2 638 214 discloses a brake motor comprising: an essentially cylindrical body filled with a hydraulic fluid subjected to a variable pressure; a mechanical actuator comprising a control member which can be accessed from outside this body; a brake piston shutting off the body in leaktight fashion and capable of sliding therein under the effect of the actuator in order to actuate, in turn, at least one friction member; and an automatic adjustment device arranged inside the body between the mechanical actuator and the piston in order to take up the play resulting from the wear of the friction member, this device itself comprising a selectively rotatable nut in which a rotationally fixed screw is engaged, one end of the screw being capable of receiving a thrust from the mechanical actuator, and the other end of the screw passing through the piston in leaktight fashion in order to be subjected to atmospheric pressure, one end of the nut having a tapered shoulder capable of being selectively rotationally blocked by an internal tapered surface of the piston, rotationally fixed, against which this shoulder is pressed with a force which increases with the pressure of the hydraulic fluid, the mechanical actuator being of the type of actuators which comprise two plates capable of relative rotation, one plate being securely fastened to one end of the screw, and the other plate being fastened to a spindle passing through the body in leaktight fashion.
The design of brake motors, regardless of their structure, their bulk and their functional specifications, permanently seeks to reduce the number of components, simplify the manufacture, reduce the bulk and increase, if still possible, the reliability of these devices, which are mass produced.
SUMMARY OF THE INVENTION
The invention is located within this context and proposes a very compact, highly reliable brake motor of very simple construction, production essentially characterised in that the mechanical actuator is of the type of those which comprise two plates capable of relative rotation, in that the first plate is securely fastened to the second end of the elongate nut, and in that the second plate is connected to a spindle passing through the body in leaktight fashion.
By virtue of this design, the elongate nut and the first plate together form a single dual-function component and the mechanical actuator, immersed in the hydraulic fluid, is both lubricated and protected from the effects of external contamination.
According to a very advantageous feature of the invention, the spindle of the second plate i
REFERENCES:
patent: 3404756 (1968-10-01), Swift
patent: 3638763 (1972-02-01), Laverdant
patent: 4784245 (1988-11-01), Fabbro et al.
patent: 5038895 (1991-08-01), Evans
patent: 5219047 (1993-06-01), Fouilleux et al.
AlliedSignal Europe Services Techniques
Ballato Josie
McCormick Jr. Leo H.
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