Brakes – Operators – Electric
Patent
1982-07-16
1984-11-06
Stoner, Jr., Bruce H.
Brakes
Operators
Electric
188 41, F16D 6534
Patent
active
044807279
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an electromagnetic track brake to be mounted on a railway vehicle for cooperation with a rail and comprising an elongate brake energizing coil, a rigid frame, and a plurality of U-shaped braking shoes mounted in a row in the frame around the lower branch of the coil and having braking surfaces disposed beneath the coil to frictionally engage the rail when the coil is energized.
BACKGROUND ART
Electromagnetic track brakes of this type are well known in the art. Typical for the prior art brakes is that the frame for the elongate brake energizing coil is suspended from the vehicle, viz. the bogie or truck frame, over the rail in such a way that the braking force is transmitted from the braking shoes to the vehicle over the coil and its normally enclosing frame. Accordingly, the coil frame partakes in the force transmission between the braking shoes and the vehicle and therefore has to be of a sturdy and reliable construction. Moreover, the transmission of braking forces over the coil frame provides a less favourable taking-up of the torque and forces involved, so that uneven wear of the braking shoes may occur.
DISCLOSURE OF INVENTION
The disadvantages mentioned above are obviated by the invention which provides an electromagnetic track brake of the type referred to, in which each braking shoe is individually movable in a vertical direction relative to the frame and is lightly biased upwards towards a rest position, preferably by means of springs.
Further, the track brake has a tie rod extending along the lower branch of the coil and a covering therefor and engaging each of the braking shoes for the transmission of braking reaction forces from the shoes to the tie rod, and also has means rigid with the frame of the vehicle and operatively connected to the end of said tie rod to take up the braking reaction forces transmitted to the tie rod.
In this way the coil will be relieved from the transmission of the braking reaction forces and accordingly can be of a simple and cheap construction. No normal coil frame will be required, only a protective covering.
A further advantage is that the mounting of the coil to the vehicle is facilitated due to the fact that no braking reaction forces are carried over such mounting. Preferably, the brake is suspended from the journal boxes of the vehicle.
The means operatively connected to one end of the tie rod can easily be integrated with the bogie or truck frame of the vehicle and preferably consists of a sturdy bracket supporting a substantially vertical rod which is engaged by an eye at the end of the tie rod, said eye being displaceable along the rod.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in further detail below, reference being made to the accompanying drawings in which
FIG. 1 is a side view, partly a longitudinal cross-sectional view, of an electromagnetic track brake according to the invention,
FIG. 2 is a cross-sectional view taken along line II--II in FIG. 1, and
FIG. 3 is a cross-sectional view taken along line III--III in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The total length of the electromagnetic track brake illustrated in the drawings is chosen, within the limits set by the space available in the underframe of a railway vehicle, according to the requirements as to the braking capacity. However, in the drawing the brake is partly cut away and is not shown in its full length, which normally may be of the order of 1 meter.
The brake comprises an elongate energizing coil 1 of a slightly different type than the one conventionally used in electromagnetic track brakes. It is enclosed by a substantially oval covering 2, which is only protective and not force-transmitting and may be made of epoxy resin. The coil covering with the coil enclosed therein lies protected in a U-shaped bracket 3, mounted by screw connections 5 to the lower side of a non-magnetic channel 4 open downwards.
Cables 6 for the electrical connection of the coil are extended from the covering 2 through bushing
REFERENCES:
patent: 3723795 (1973-03-01), Baerman
patent: 3768607 (1973-10-01), Marzocco
patent: 4299312 (1981-11-01), Bengtsson et al.
Bengtsson Nils K.
Ljung Egil K.
Brown Laurence R.
Oberley Alvin
SAB Industri AB
Stoner Jr. Bruce H.
LandOfFree
Electromagnetic track brake for a railway vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electromagnetic track brake for a railway vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetic track brake for a railway vehicle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1038676