Brakes – Vehicle – Railway
Patent
1982-05-28
1984-06-19
Stoner, Jr., Bruce H.
Brakes
Vehicle
Railway
188206R, 267 3, B61H 1338
Patent
active
044549326
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to suspension means for a rail vehicle disc brake unit, which includes a yoke or caliper, brake pad holders associated therewith, and a brake cylinder for applying brake pads on the brake pad holders against a brake disc,
the suspension means comprising suspension links, pivotally connected to the brake pad holders and, indirectly or directly, to a suspension console or framework, which is attached to a bogie or underframe of the vehicle, and a further supporting connection between the console or framework and the brake unit.
BACKGROUND ART
Suspension means with consoles or frameworks for unit-type disc brake arrangements are known, for example through U.S. Pat. No. 2,873,004, GB No. 1,256,713 and DE No. 2 615 243. Advantages with such a console or framework are that the original mounting of the disc brake unit on the bogie or underframe is greatly facilitated in that only simple mounting arrangements are required on the vehicle and that a completely prefabricated disc brake is mounted by means of for example a few bolts. The corresponding advantage is obtained at a replacement or repair, when a new disc brake may be fitted in a very short time.
Movements in different directions of a wheel-set relative to the vehicle part in its vicinity on which a disc brake suspension console or framework is mounted will always occur, and there is presently a tendency to deliberately enhance this freedom of movement.
For obtaining a satisfactory brake operation it is therefore of increasing importance to enable the suspension means to follow the movements of the brake disc on the wheel-set also during braking, such movements being both translational and angular.
THE INVENTION
This is according to the invention attained in that the suspension means include connection means, which are stiff in the normal brake force transmission direction but comparatively resilient in other directions.
It is preferred that a connection means according to the invention comprises a joint, mainly consisting of a screw, which is to be attached to a fixed member and loosely extends through a hole in a member to be conditionally movable relative to the fixed part, a bell-shaped cover arranged on each side of the movable part around the screw, and a ring-shaped rubber cushion filling the compartment defined by each cover, the movable member and the screw.
In this joint a force transmitting tube is preferably arranged around the screw, and a sealing ring preferably of a plastic material is arranged around the rubber cushion in sealing contact with the movable member and slidable against the cover.
In an embodiment preferred for an axle-mounted brake disc, where it is possible to have arrangements close to the disc, the joint is arranged between a console, which is to be attached to the bogie or underframe of the vehicle and is the fixed member, and a cradle, to which the suspension links are pivotally attached and which is the movable member.
Such an advantageous cradle design is per se known through DE No. 1 800 595 and U.S. Pat. No. 3,624,765, but in those cases there are no mounting consoles or joints as in the present case.
It is not possible to take advantage of the positive properties of the cradle and joint, if the further supporting connection between the console and the brake unit is non-resilient.
This connection is therefore according to a further feature of the invention in the form of a resilient guide block, into which a tongue of the console extends and which is loosely clamped between the brake unit and a bracket mounted thereon.
The normal brake reaction force is tangential to the brake disc, i.e. substantially in the direction of the suspension links. However, when a vehicle is just about to come to a stand-still, the brake reaction force may turn over to being radial to the brake disc or perpendicular to the normal reaction force. This momentary direction change is due to the resiliency in the vehicle suspension and the mass forces.
The otherwise required reinforcement of the cradle
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patent: 2445723 (1948-07-01), Brown
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patent: 2908341 (1959-10-01), Nallinger
patent: 3122219 (1964-02-01), Altherr
patent: 3624765 (1971-11-01), Hauth
patent: 3712246 (1973-01-01), Lich
patent: 3957318 (1976-05-01), Wiebe
Emilsson Fred S.
Severinsson Lars M.
Stensson Bo G.
Brown Laurence R.
Oberleitner Robert J.
SAB Industri AB
Stoner Jr. Bruce H.
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