Project Title

YZ250 LHRB

Document Type

Dissertation/Thesis

Date of Degree Completion

Spring 2018

Department

Mechanical Engineering Technology

Committee Chair

Dr. Craig Johnson

Second Committee Member

Professor Roger Beardsley

Third Committee Member

Professor Charles Pringle

Abstract

YZ250 LHRB

A Left Hand Rear Brake (LHRB) means that a motorcycle can not only have the rear brake operated by the foot pedal that comes standard on all bikes, but it can be actuated by a lever located on the handlebar as well. The purpose of this engineering project is to design a bracket that can hold two brake calipers while not hindering stock handling. It should also add braking usability and power.

The device is to be made of mild steel for the first models, this will allow for ease of prototyping, fitment testing, and finalized design testing. The bracket needs to be functional, holding two brake calipers, be crash resistant and resistant to the elements.

The testing methods will be both in the field and in the lab. It will be bench tested for weight and deflection requirements. Then it will be tested in real world situations to see how well it will hold up in maximum conditions.

The predicted results of the steel version of the bracket is to be: 1) The device should not weigh more than 150% of the original bracket for a single brake caliper. 2) No arm of the bracket should deflect more than ten-thousands of an inch under the maximum braking force. 3) The brake lever should be able to complete a full lock of up the rear brakes with a 10lb force pull on the hand lever. After testing sequences are completed an aluminum version is the end goal of the project.

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