Chain drive opportunity
From DDL Wiki
(→User Study) |
(→Competitor Products) |
||
| Line 15: | Line 15: | ||
|[[Image:CompDiff.jpeg|300px|thumb|center| Pivot Plates for Fomula Ford Differential]] | |[[Image:CompDiff.jpeg|300px|thumb|center| Pivot Plates for Fomula Ford Differential]] | ||
|[[Image:Radical.jpeg|300px|thumb|center| Radial SR1 with chain drive]] | |[[Image:Radical.jpeg|300px|thumb|center| Radial SR1 with chain drive]] | ||
| + | |[[Image:Radicalover.jpg|300px|thumb|center| Radial SR1 with turnbuckle pretension system]] | ||
|} | |} | ||
Revision as of 22:02, 4 October 2012
Contents |
Executive Summary
Market Research
In order to ascertain the market in which this product would exist we looked into the needs of small scale racing teams, such as Formula SAE teams and more widespread amateur racing series. This includes entry level series such as the Radical SR1 cup and other racing cars built to use motorcycle engines. In order to determine stakeholder needs we performed a user study and interview, Interviews with professionals and survey results.
Stakeholder Needs
Competitor Products
Before deciding on a path for the rest of the market research we first came up with a market space and found competitor products.
 |  |  |  |
User Study
We designed a study to identify normal issues with the pretension and function of maintenance on the drivetrain of the Carnegeie Mellon Racing Formula SAE car. This vehicle is representative of the set up used both in the FSAE series but also in other low cost racing series where chain drive is prefered. Two mechanically inclined individuals who did not have prior knowledge of the car’s design were asked to loosen the chain completely and re-tighten the driveline. This procedure allows us to artificially create a situation of a loose chain.
The first thing observed in this study was that access to adjustment turnbuckles was very limited. This was compounded by the fact that tools were not common between the separate locking nuts and the turnbuckles. The lack of access and direct line of sight also made finding the position desired for the plates was hard. The users attempted to gauge position of the plate via number of turns on the turn buckles. This concept could be used in the future to help locate differential plate position. However, on the current set up the number of turns did not create the same movement between the two sides, making this method useless.
Towards the end of the work we noticed a lot of confusion in determining how tight the chain needed to be and whether the differential housing was indeed aligned properly. This meant a lot of time wasted trying to figure out how to determine these specifications and also how to indicate if they were within spec. “When are we done here?” was the common phrase used. This shows a key flaw in the system, there is no way to indicate alignment and tension on the plates. They ended up just pulling on the chain to determine tension (a feeler method) and then standing back a bit and closing one eye to gauge alignment. It seemed as though they got a grasp on the whole process fairly well but had no idea if they met the end criteria. There is no specification for chain tension on a project like this (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.
 |  |  |
User Interviews
Expert Interview
Design Concepts
 |  |  |
 |  |  |
