Page Comparison

Status

Status

colour	Yellow
title	In Progress

Owner

Gerard Cardenas

Contributors

Philip Bortolotti Cesar Hernandez

Approved

Due date

02 Jun 2024

Decision

On this page

Table of Contents

maxLevel	2
minLevel	2

❓ Problem statement

U-Joint setup is required to be past the 45 degrees possible for the current U Joints. Additionally, the U-Joints are two different angles => decreasing the power transmission from the steering to the rackThere are many options for components linking the steering wheel to the rack. This decision matrix is to decide the best option for each component.

💡 Research insights

📊 Solution hypothesis

🌈 Design options

Steering rack NEEDS to be extended to reduce the length of the tie rods

How are we going to positively lock the steering extender (since the rack has a blind hole)

Bolt the clevis into the steering extender (need to safety wire the bolt onto the clevis) and have the adjustable tie rod with heim joints and jam nuts at both ends

Include linear bearings mounted to the frame tubes for support at both ends and implement steering stop at ends of the extenders (as a step in the shaft) to make contact with linear bearing housings at full turn

Output Shaft to Coupler
Option 1
Option 2
Option 3
Overview
Use a 5/8” OD shaft with a through hole to fix inside of splined coupler with bolt
Use a 5/8” OD steel shaft, insert shaft into coupler, and weld side of shaft onto edge of the coupler
Use a greater diameter steel shaft and weld edge of the shaft to the edge of the coupler
Screenshot
Link
Benefits and risks
simplest solution
Need extra support which will need additional mounting tabs on frame
increase legroom for driver (makes egress easier), eliminates need for joints and gears
alters steering geometry by increasing bump steer
necessitates new steering arm to protrude above and to the side of upright
reduces angle needed for both u joints/eliminates need for two u joints
bevel gear can be tricky to keep meshing
bevel gear with correct dimensions may be difficult to obtain Relatively easy to manufacture - no need for welding
No need for a special shaft (splined shaft or DD shaft)
Constraining with a bolt going through a through hole can deform the shaft (might have to use steel)
A stronger alternative to using a bolt to constrain shaft
Need to use steel to weld onto the coupler
Coupler steel grade not specified, may be risky to weld
Opens up the opportunity to use a u joint that has a shaft diameter other than 5/8”
Coupler steel grade not specified, may be risky to weld
Criteria
U-joint
Option 1
Option 2
Option 3
Overview
Smooth Bore
Spline
DD Shaft
Screenshot
Image Added
Image Added
Image Added
Link
Benefits and risks
Can accommodate regular smooth pipes - no need for special shaft (spline shaft or D shaft)
Only way to constrain the shaft is to weld the shaft onto the u joint - shaft needs to be same material as the u joint
No need to drill extra holes
May be difficult to find a spline shaft (at least in the desired size)
Shaft cannot be hollow - adds weight
No need to drill extra holes
May be difficult to find a double d shaft (at least in the desired size)
Shaft cannot be hollow - adds weight
Criteria

✅ Follow up

Decision

Status

Next steps

Status

colour	Green
title	decided

/

Status

colour	Yellow
title	in review

/

Status

title	other

💎 Source files

Type /link to add links to design files.

Output Shaft to Coupler	Option 1	Option 2	Option 3
Overview	Use a 5/8” OD shaft with a through hole to fix inside of splined coupler with bolt	Use a 5/8” OD steel shaft, insert shaft into coupler, and weld side of shaft onto edge of the coupler	Use a greater diameter steel shaft and weld edge of the shaft to the edge of the coupler
Screenshot
Link
Benefits and risks	simplest solution Need extra support which will need additional mounting tabs on frame	increase legroom for driver (makes egress easier), eliminates need for joints and gears alters steering geometry by increasing bump steer necessitates new steering arm to protrude above and to the side of upright	reduces angle needed for both u joints/eliminates need for two u joints bevel gear can be tricky to keep meshing bevel gear with correct dimensions may be difficult to obtain Relatively easy to manufacture - no need for welding No need for a special shaft (splined shaft or DD shaft) Constraining with a bolt going through a through hole can deform the shaft (might have to use steel)	A stronger alternative to using a bolt to constrain shaft Need to use steel to weld onto the coupler Coupler steel grade not specified, may be risky to weld	Opens up the opportunity to use a u joint that has a shaft diameter other than 5/8” Coupler steel grade not specified, may be risky to weld
Criteria
Criteria

U-joint	Option 1	Option 2	Option 3
Overview	Smooth Bore	Spline	DD Shaft
Screenshot	Image Added	Image Added	Image Added
Link
Benefits and risks	Can accommodate regular smooth pipes - no need for special shaft (spline shaft or D shaft) Only way to constrain the shaft is to weld the shaft onto the u joint - shaft needs to be same material as the u joint	No need to drill extra holes May be difficult to find a spline shaft (at least in the desired size) Shaft cannot be hollow - adds weight	No need to drill extra holes May be difficult to find a double d shaft (at least in the desired size) Shaft cannot be hollow - adds weight
Criteria
Criteria

Versions Compared

Old Version 1

New Version 2

Key

❓ Problem statement

💡 Research insights

📊 Solution hypothesis

🌈 Design options

✅ Follow up

💎 Source files