Brakes – Wheel – Axially movable brake element or housing therefor
Reexamination Certificate
1999-10-22
2001-08-21
Oberleitner, Robert J. (Department: 3613)
Brakes
Wheel
Axially movable brake element or housing therefor
C188S156000, C188S343000, C188S1960BA
Reexamination Certificate
active
06276497
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a brake actuator for delivering a brake force through a brake block or the like to a rotating member to be braked, the actuator comprising in a housing a service brake arrangement, including an electric motor and means for transforming its rotary movement into an axial movement of a push rod, and a safety brake arrangement, including at least one powerful spring, acting in a brake application direction, means for tensioning the spring by the reaction at a service brake application, and mechanical means for locking the spring to the housing in a tensioned state, which locking means can be released at will for accomplishing a safety brake application.
BACKGROUND OF THE INVENTION
A brake actuator of this kind is shown in applicant's WO 96/12634. Special reference is made to FIG. 12 therein with accompanying description, which deals with a disc brake actuator embodying the invention according to said patent publication.
Generally speaking, there is a growing interest in the art of rail vehicle braking to make use of electrical power in one way or another instead of air pressure or hydraulic pressure for the brake application. More specifically, the technique diclosed in said publication with an electrical service brake arrangement and a safety arrangement with a powerful spring may be of interest not only for disc braking as disclosed in the publication but also for block braking, where a brake block or brake shoe is to be brakingly applied against the tread of a rotating wheel.
One of the major problems with present rail vehicle bogie designs is the extremely limited space available for a brake actuator, which has been detrimental to earlier attempts with block brake actuators of the kind referred to.
The main object of the invention is accordingly to accomplish a brake actuator of the kind referred to with a minimum space requirement but yet fulfilling all other requirements posed thereon.
THE INVENTION
This is according to the invention attained in that the spring of the safety brake arrangement is arranged substantially transverse of the push rod and is arranged to act thereon over at least one wedge.
The wedge preferably cooperates with rollers, of which a first one is rotatable on a push rod sleeve, surrounding the push rod, and a second one is rotatable in the housing.
Preferably, two wedges connected to a cup for supporting the spring extend astraddle of the push rod sleeve, and first rollers cooperating therewith are arranged on a force transmitting ring on the push rod sleeve.
An especially advantageous layout may be obtained if the service brake arrangement and the safety brake arrangement are disposed at either side of the push rod, substantially in the same longitudinal plane.
As the application of the brake by means of the electric motor, it is important to obtain a signal, when the desired brake force has been reached.
In the actuator according to the invention the push rod sleeve with its force transmitting ring may for this purpose be provided with a device for emitting such a force-related signal.
Practically, a collar of an elastic material may be disposed between two ring members, of which the force transmitting ring is composed, the collar being surrounded by a closed metal sleeve provided with a strain gauge or the like.
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patent: 3572478 (1971-03-01), Nagle et al.
patent: 3627081 (1971-12-01), Santos
patent: 3712181 (1973-01-01), Swander et al.
patent: 3756354 (1973-09-01), Clark
patent: 3797613 (1974-03-01), Nehr
patent: 3966028 (1976-06-01), Anderson et al.
patent: 4194596 (1980-03-01), Garrett et al.
patent: 4351419 (1982-09-01), Garrett et al.
patent: 4354582 (1982-10-01), Severinsson
patent: 4699256 (1987-10-01), Severinsson
patent: 4784244 (1988-11-01), Carre et al.
patent: 4953668 (1990-09-01), Severinsson
patent: 4953669 (1990-09-01), Severinsson
patent: 5103944 (1992-04-01), Severinsson
patent: 4403740 (1995-10-01), None
Breiner & Breiner L.L.C.
Kramer Devon
Oberleitner Robert J.
SAB WABCO AB
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