Damping device

Abstract

A damping device, including: a wedge assembly having a wedge including a vertical surface and an inclined surface; a primary friction board disposed on the vertical surface; and a secondary friction board disposed on the inclined surface; and a damping spring assembly disposed underneath the wedge assembly. The wedge assembly has the following structure parameters: α=16-30°, and μ<tgα<μ+μ₁, where α represents an included angle between a friction surface of the secondary friction board and a vertical plane, μ represents a friction coefficient of the primary friction board, and μ₁ represents a friction coefficient of the secondary friction board.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of International Patent Application No. PCT / CN2010 / 079610 with an international filing date of Dec. 9, 2010, designating the United States, now pending, and further claims priority benefits to Chinese Patent Application No. 201010162237.1 filed Apr. 27, 2010. The contents of all of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference. Inquiries from the public to applicants or assignees concerning this document or the related applications should be directed to: Matthias Scholl P. C., Attn.: Dr. Matthias Scholl Esq., 14781 Memorial Drive, Suite 1319, Houston, Tex. 77079.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a damping device, and more particularly to a damping device for a wedge of a wheel truck of a railroad freight car.[0004]2. Description of the Related Art[0005]As a critical part of...

AI Technical Summary

Benefits of technology

[0016]First of all, the wedge assembly of the damping device not only assures a free movement of the wedge assembly when the bolster moves in a vertical direction, but also prevents the wedge assembly from moving when the bolster moves in a horizontal direction. Thus, the wheel truck has an enough high diamond resistant rigidity and good dynamic performance even without a crossed supporting device or a spring plank. Furthermore, the design of the width of the wedge assembly which is 1.3 times longer than that of the conventional also improves the diamond resistant rigidity and the dynamic performance, thereby highly improving the critical speed of the freight car, the capacity of crossing curved tracks, and the running performance. Finally, the wheel truck has a simple structure, light weight, and low production and maintenance costs, which is applicable to the new railroad freight car having a running speed of 120 km / h, and meets the requirements of the diamond resistant rigidity for the speed-raising trains.

Problems solved by technology

Supposing that, the angle α is too small and approximates to the friction angle of the primary friction board of the wedge assembly, the wedge assembly will be self-limited once the bolster assembly moves downwards relative to the side frame assembly, thereby lowering the dynamic performance of the wheel truck.

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