Brakes – Vehicle – Railway
Patent
1982-04-20
1984-09-25
Reger, Duane A.
Brakes
Vehicle
Railway
188 718, 188 724, B61H 1320
Patent
active
044731361
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a rail vehicle disc brake arrangement, including a disc brake yoke to be suspended from an underframe or bogie of the vehicle in the vicinity of the disc or discs to be braked, the yoke being provided with a fluid operated brake cylinder, a slack adjuster, and associated pad holders with brake pads on either side of the disc or discs.
BACKGROUND ART
Most disc brake arrangements for rail vehicles are of a type in the art usually referred to as the caliper type and having two legs connected to each other at an intermediate portion. The free end of each leg is provided with a pad holder and a brake pad, whereas the opposite ends thereof are actuated by a brake cylinder often incorporating a built-in slack adjuster. The slack adjuster may, however, in certain cases be arranged somewhere else in the disc brake arrangement, for example as shown in U.S. Pat. No. 3,645,364, where it constitutes the connection link between the two legs or levers of the caliper.
Although many intermediate variations may be found a second but still less usual main type of rail vehicle disc brake arrangement is the yoke type, where a substantially stiff yoke extends around the disc to be braked and a brake force is applied from said yoke, for example by means of a brake cylinder on the yoke at the disc. A relatively recent and typical example of such an arrangement is shown in GB No. 2 018 918 but also GB No. 1 236 877 is illustrative.
The known arrangements suffer from different disadvantages, some of them having regard to specific applications, and it is of utmost importance to improve the versatility of the arrangement so as to allow the use of a certain arrangement with only relatively minor modifications for a great variety of applications. In other words: it is desirable to obtain an arrangement consisting of relatively few interchangeable components usable for a great variety of applications on different kinds of vehicles and bogies with a low space requirement, low price, low maintenance cost and so on.
THE INVENTION
All the different requirements are according to the invention fulfilled and the disadvantages with prior arrangements obviated if the slack adjuster is arranged to act between two telescoping yoke parts--a fixed part and a movable part--of which the yoke is comprised, if one pad holder with its brake pad, in a way known per se, is arranged on the fixed yoke part, and if a yoke lever with the second pad holder and its brake pad is pivotally attached at an intermediate portion thereof to the movable yoke part, is connected to the brake cylinder mounted on the movable yoke part, and is arranged to control the slack adjuster.
If the available space axially from the disc is limited, which it often is, and if a force amplification from the brake cylinder is desirable, the brake cylinder may be connected to the yoke lever at its end opposite to the pad holder and brake pad, the yoke lever thus acting as a force transmitting means.
In such a case the slack adjuster preferably is of the axial type, is arranged within the yoke, is attached to the movable yoke part and is anchored to the fixed yoke part, the yoke lever coacting with a control member protruding from the slack adjuster.
In a modified embodiment, which is of special interest if it is desired to use a well tested and comparatively cheap slack adjuster made in very large series, the slack adjuster is of the automatic brake lever type, primarily intended for automotive S-cam drum brakes, is attached on the movable yoke part, and with its outgoing work wheel is connected to a cam-shaft, which is rotatably arranged in the movable yoke part and has a cam engaging a corresponding hole in the fixed yoke part.
In such a case a control arm of the automatic brake lever may be connected to a transmission arm pivotally attached to the yoke lever.
If there is more space axially than radially around the disc and if other special requirements are to be fulfilled, the brake cylinder may be connected to the yoke lever at its conne
REFERENCES:
patent: 2713400 (1955-07-01), Coskun
patent: 3645364 (1972-02-01), Otto et al.
patent: 3692152 (1972-09-01), Larsson
patent: 3908803 (1975-09-01), Otto et al.
patent: 3997035 (1976-12-01), Zeilder
Emilsson Fred S.
Severinsson Lars M.
Stensson Bo G.
Brown Laurence R.
Gilday M. P.
Reger Duane A.
SAB Industri AB
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