International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
Design of chain tensioner for FSAE car Ashish V. Dewade1, Mayuresh S. Joshi2, Shubham R. Agarwal3, Mohit D. Agrawal4, Mrs. J. P. Wagh5 1-4B.E.
Mechanical, PCCOE, Pune, Maharashtra, India Dept. of Mechanical, PCCOE, Pune, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------5Professor,
Abstract - The purpose of this paper was to design the 2017 combustion car differential mount for Team Kratos racing. The goal of this paper was to improve upon the 2016 differential mount design by reducing complexity, weight, and maintenance time. To reduce complexity the differential mount are placed on engine mount which reduces the alignment problem. These changes were able to reduce weight and the complexity of machining by making the designs simpler. The differential mount had its complexity reduced by moving to a eccentric chain tensioning design. This was chosen because it reduced the time to adjust the chain and reduced the overall part count of the system. Key Words: Chain Tensioning, Differential, Differential mount , Eccentric, Alignment Fig -1: Rigid differential mount
1. INTRODUCTION The entire FSAE car is designed around the engine. This allows us to take advantage of the strength of the engine while minimizing structural components in the frame. Despite the obvious benefits of direct engine mounting, this scheme is uncommon for FSAE teams. There are many factors outside of the load path that contribute to the mounting position. The choice of a different style differential, the chain tensioning method, interferences caused by the sprocket and chain and the manufacturing capabilities of the students and the school all play a role in the final decision. There is no specification for chain tension on a project like this FSAE (custom race ) car and while trying to also align the differential this made determining when they were finished hard. With an easy method to measure position or a discrete number of locations this problem would be eliminated.. Because of this fact, four designs were developed that deal with properly aligning and tensioning the chain and are detailed below.
2.2 Spring Tensioner Taken from many industry chain drives, the mechanism utilizes a fixed differential and takes up slack in the chain with a spring loaded idler gear. The tensioning mechanism is of the drive sprocket and differential so can be attached in a variety of convenient locations within the rear box of the vehicle. The spring mechanism can be adjustable to provide a post-installation determine preload. This tensioner is used in first car. This is simple way if your design does not allow chain tensioning. But mounting of this spring tensioner must be rigid to reduce loosening effect.
2. SELECTION OF TYPE OF CHAIN TENSIONER 2.1 Rigid Differential Mount The rigid differential mount has no moving components used to tension the chain. This arrangement provides a very robust and simple means to hold the differential in position relative to the drive sprocket, but relies on an accurately sized chain that can be difficult to attach. This is not possible because accurate manufacturing is not achievable at all at student level. Š 2017, IRJET
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Fig -2: Spring Tensioner
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