Design of a Geared Transmission for the Basic Utility Vehicle

Photo of David Halbrook, Guillermo Hernandez, Christopher Lin, Ruiz, Daniel Students: David Halbrook, Guillermo Hernandez, Christopher Lin, Ruiz, Daniel

Sponsor: Institute for Affordable Transportation

Date: Spring 2012

Requirements:
The transmission must withstand the torque output from the BUV's continuously variable transmission. It must use planetary gear sets in series and must cost no more than $350. The transmission must use off-the-shelf parts, and the overall part count should be minimized (<40). The transmission must also fit within the current size constraints posed by the parts with which it will mate.

Problem:
The Institute for Affordable Transportation is seeking to replace the current transmission used in the Basic Utility Vehicle (BUV) with a high torque transmission based using planetary gear sets. This transmission should provide two forward speeds and one neutral gear.

Solution:
The team designed a transmission using two planetary gear sets in series. By alternating the second transmission between normal operation, free spinning, and direct drive, the BUV gearshifts between low, neutral, and high speeds, respectively. The design The cost constraint was not met; however, the design also included a number of other alternatives that allow the vehicle to work in the intended manner while still meeting the budget.

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