Skid Steer Door Design Critical Design Review

1
Skid Steer Door Design Critical Design Review

• MAE 416
• Senior Design
• Professor Eric Klang
• February 14, 2002
• The CatPack

2
Group Personnel

• Patrick Rorie
• Tim Goodson
• Jeff Watson
• James Busi
• Jacob Morgan

3
Outline of Presentation

• Background CAT SSL
• Design Objectives Constraints
• Four Designs
• Summary Conclusion
• Questions

4
Background CAT SSL

• Headquartered in Peoria, Il
• World's largest manufacturer of construction and
  mining equipment
• Shipped 1st skid steer loader in 1999
• Many applications, one of smallest machines in
  CAT product line

5
Design Objectives for Door

• Improve visibility
• Improve sealing
• Prevent damage to open door when arms/bucket
  lifted
• Improve aesthetics

6
Design Constraints

• Costlt300
• Tooling Costlt2K
• 1500 hr no failures
• Installationlt1 hr
• Removablelt5 min
• Cannot change head clearance or cab height.

7
Modified Door Hinge

• Satisfies 5 min. removal
• Unlocks any seizure by rotating door
• Single person can install or remove door
• No need for tools (hammer, wrench, etc.)

8
Improving Visibility

• Bottom panel eliminated
• Wiper assembly bolted to glass.
• Reservoir moved into cab
• Door extended downward 2 inches.

9
Improving Seal

• Wanted one-piece frame, impossible.
• Two-piece, but extend sides until they meet.
• Also add foam to fill gap under door frame.

10
Prevent Damage from Arms

• Install switch in door frame.
• Ties into circuit under seat.
• Circuit will tie in with power cables so when
  door is removed, arms will still operate.

11
Improve Aesthetics

• Handle moved up to side
• Glass fills almost entire door.
• Step moved down.
• Design attempts most simplistic solution,
  reflected in aesthetics.

12
Summary Conclusion

• Each design objective met with one or more
  innovation.
• In formulating detailed design, attention must be
  paid to safety guidelines stress analysis.

13
Questions

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