Brakes – Vehicle – Railway
Patent
1997-09-24
2000-10-31
Mar, Michael
Brakes
Vehicle
Railway
188 70R, 1882191, 1882256, B61H 1300
Patent
active
061388009
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a braking device for a railroad vehicle, and such a device, more particularly, includes traction means arranged to apply a braking pad on a braking surface affixed to a wheel of the vehicle.
2. Description of Background and Relevant Information
Devices of the aforementioned type are already known which are more particularly used on railroad freight cars. The braking pad acts by friction on the tire of the wheel to cause the braking. The traction means are generally constituted by a triangular member made of metallic bars and referred to as a brake triangle. This is an isosceles triangle, with its apex in the plane of symmetry of the car and its other two angles in the vicinity of two wheels of the car mounted on the same axle.
The braking force is applied at the apex of the triangle in the aforementioned plane of symmetry, and this force is also distributed between the two pads to apply them to the corresponding tire to cause the braking of the car.
Disk brakes, of the same type as those used in automobiles, are also known and are generally used on the motor coaches or passenger coaches. These brakes have the advantage of providing a very energetic braking, of being quieter and of generating less vibrations than the conventional brakes acting on the tires. However, they are very expensive and function in a total different manner. Therefore, they cannot be adapted to railroad vehicles provided with brake triangles.
Finally, a device is known from the document U.S. Pat. No. 4,008,789. However, this device comprises a complex hinged assembly.
SUMMARY OF THE INVENTION
The present invention aims at providing improved braking means for railroad vehicles. More particularly, it aims at providing a braking device combining the simplicity and robustness of the conventional brakes with a more efficient braking. It also has the object of providing such a device that can utilize the conventional braking chain having a brake triangle. In addition, it aims at increasing the braking capacity of such braking chains without increasing the braking force applied to the brake triangle.
To this end, the object of the invention is a braking device for a railroad vehicle including traction means arranged to apply a braking pad on a braking surface affixed to a wheel of the vehicle, a reaction member, at least one lever arranged to cooperate with said reaction member, connecting means between said traction means and said lever, characterized in that said braking pad is borne by said lever to be applied on said braking surface by pivoting of said lever under the action of said traction means and of said reaction member.
The lever device according to the invention makes it possible to increase the braking force while maintaining the same braking control chain as in the conventional devices.
In a particular embodiment of the invention, said reaction member is constituted by the tire of a wheel of the vehicle, said lever cooperating with said tire by means of a support element.
More particularly, said support element can form a braking pad, said braking surface then forming a complementary braking surface.
The complementary braking surface makes it possible to increase the braking capacity with respect to a conventional triangle braking device. Nevertheless, as has been previously indicated, the braking control chain is the same as in these conventional devices.
In an alternative embodiment, the support element does not participate in the braking and is constituted, for example, by a roller rolling on the tire.
In another embodiment of the invention, the reaction member is affixed to the structure of the vehicle. Of course, in the case where the vehicle is a bogie coach, the reaction member is in fact affixed to the bogie structure.
This embodiment makes it possible to avoid involving the tire of the wheel in the braking process, and therefore to avoid damaging it. As a result, noise and vibrations are reduced.
Still in a particular embodiment o
REFERENCES:
patent: 595496 (1897-12-01), Pickles
patent: 2359788 (1944-10-01), Pierce
patent: 2359806 (1944-10-01), Tack
patent: 2581746 (1952-01-01), Baselt
patent: 3791491 (1974-02-01), Tickle
patent: 4008789 (1977-02-01), Clemmons
patent: 4193479 (1980-03-01), Quilici
Caron Bernard
Deramaux Jean-Michel
Mar Michael
Societe des Forges de Fresnes
Williams Thomas
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