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

The invention is a damping device for a wheel truck that has a simple structure, low production and maintenance costs, and meets the requirements of diamond resistant rigidity for speed-raising trains. The device includes a wedge assembly with a low angle of up to 30 degrees, which prevents the wedge assembly from moving downwards when the bolster assembly moves in a horizontal direction. The wedge assembly has a width design that increases the length of the torque arm to resist the diamond deformation between the bolster assembly and the side frame assembly, and improves the diamond resistant rigidity between the bolster assembly and the side frame assembly. The damping spring meets a specific rigidity formula to prevent frictions during movements in vertical and horizontal directions. The secondary friction board is connected to the inclined surface of the bolster via a spherical structure, which ensures good contact and reduces damages on the inclined surface of the bolster. The wheel truck has an enough high diamond resistant rigidity and good dynamic performance even without a crossed supporting device or a spring plank. The damping device has a simple structure, light weight, and low production and maintenance costs.

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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