Candidate Projects E-CVT (sign IP Agreement) –Use the same idea for fix variable transmission (100 : 1) Omni Wheels Telescoping Pole

Continuous Variable Transmission (CVT) Jerry Tang - Elite

E-CVT Principle A is rotating while it is revolving alone circle B A rotation speed is R/r -1 or (R-r)/r How can we make A revolve along circle B? This is E-CVT A B C X X R r

Example No Slippage A B C D A B C D B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ R = 2” Theta = Pi/4 r = 1” Gear Ratio = R/r -1 = 2/1 -1 = 1:1 B’ C’ D’ A’

Gear Ratio

E-CVT Prototypes 1) Vertical Piston2) Horizontal Piston 5) Driven Gear 4) Floating Gear 6) Sliding Cam 3) Fixed Cam

E-CVT Current Prototypes 1) Vertical Piston 2) Horizontal Piston 4) Driven Gear 3) Floating Gear

E-CVT Output Shaft 1) U-Joint 2) Slotted X-Y Joint 6) Outer Gear Output 4) Flexible Shaft 3) Pinned X-Y Joint 5) Inner Gear Output

X-Y Joint

The 2nd Generation of the E-CVT Prototype Project Based on the resource, time, availability, and course guidelines, work with students to define and achieve the project objectives according to the following: 1. Understand CVT and E-CVT. 2. Determine/Analyze the constraints of the E-CVT. For instance: a. Is input and output reversible? b. O/I ratio range. c. Output torque range. d. How can the O/I ratio be a function of the input torque (auto shifting)? 3. Determine the efficiency of the E-CVT. 4. Determine the E-CVT component dependencies in term of O/I ratio, O/I torque, etc. 5. Model, simulate, design, and produce the prototype if applicable. This list can be grown and shrunk as necessary.

Backup

Vertical Pistons

Drawing of Floating Gear

Drawing of Driven Gears

Horizontal Piston

Example No Slippage R = 2” Theta = Pi/4 r = 1” Gear Ratio = R/r -1 = 2/1 -1 = 1:1 A B C D A B C D B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’ B’ C’ D’ A’

Gear Ratio