bicycle mechanics and repair decal mechanical engineering ... · bicycle mechanics and repair decal...
TRANSCRIPT
![Page 1: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/1.jpg)
Bicycle Mechanics and Repair DecalMechanical Engineering 98/198
Spring 11
Lecture 10Lecture 10Aleksey Shepelev
Jim GaoNick KooHenry Yi
Allen Gurdus
![Page 2: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/2.jpg)
High Tech Bikes
The latest and greatest in bike technology
![Page 3: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/3.jpg)
Outline
• Frame design• Frame materials• Electronic shifting• Electronic shifting• Bamboo bikes?!• Formula racing
![Page 4: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/4.jpg)
![Page 5: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/5.jpg)
![Page 6: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/6.jpg)
Example of frame loading
Frame deformation is largely due to:
•Material construction- Steel, aluminum, or carbon fiber?carbon fiber?
- High or low modulus- Composite materials
• Frame design - Aero or low weight- FEA and CFD analysis
![Page 7: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/7.jpg)
High Modular Carbon Fiber
Higher Young’s Modulus = Stiffer Material
Problem: You don’t want your CF to be too stiff!
- Ride quality- Ride quality- Need deformations toabsorb shock
- Beware of marketing gimmicks
![Page 8: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/8.jpg)
Integrated seatpostAero center tube
Reinforced headtube,Airfoil design
Reinforced bottom bracket
![Page 9: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/9.jpg)
Electronic Shifting
Shimano Di2 Dura Ace- Electronically-assisted
shifting- No cable friction or
contaminationcontamination- Shifters are series of
electrical switches- No chain rub- $4,700 component group
![Page 10: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/10.jpg)
Bamboo Bikes
Improved weight and vibration-damping:
- Heat-treated bamboo- Hemp lugs- Hemp lugs- Flexible frame geometry- Unparalleled bad-assery
![Page 11: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/11.jpg)
The World’s Most Advanced Bicycle?
Built by British firm BERU F1 Systems:
- Carbon composite chassis- Twin-bladed fork design- Carbon ceramic or steel - Carbon ceramic or steel disc brakes
- Integrated biometric performance monitor withLCD touchscreen display
- Shimano Di2 shifters
![Page 12: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/12.jpg)
Components
PedalsBottom Bracket
![Page 13: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/13.jpg)
Reverse ThreadReverse/Left thread
Normal/Right thread
Other places with reverse threads- Left Pedal- Right side of adjustable bottom bracket- Left side of one-piece crank bottom bracket- Lockring on single rear cog
Righty-tighty, Lefty-looseyDon’t get confused; double check to make sure you’re turning the right way!
![Page 14: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/14.jpg)
Removing Pedals
• Tools: 15mm long handle wrench– Longer handles will make it
easier. τ=rF
• Left pedals are left-threaded • Left pedals are left-threaded (reverse) and Right pedals are right-threaded (normal)
![Page 15: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/15.jpg)
Removing Pedals
• Rule of thumb – When loosening pedals, always turn wrench towards the back of the bike!
Towards the back à
ßTowards the back
Right pedalLeft pedal
Towards the back à
![Page 16: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/16.jpg)
Inserting Pedals
• Remember that left pedals are left-threaded and right pedals are right-threaded. – Always turn wrench towards the front!
ßTowards the front Towards the frontà
Right pedalLeft pedal
ßTowards the front Towards the frontà
![Page 17: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/17.jpg)
Cranks!
![Page 18: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/18.jpg)
Cranks can be attached…Different bottom brackets call for cranks with different tapered fits
![Page 19: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/19.jpg)
Tools for Crank Removal
![Page 20: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/20.jpg)
The crank puller
Threaded screw within a threaded screw
![Page 21: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/21.jpg)
Installing and Removing
Different cranks = different tools
![Page 22: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/22.jpg)
Removing
1. Remove dust caps (if you have any)
2. Remove the crankbolt
![Page 23: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/23.jpg)
3. Thread on the large threaded barrel of the crankpuller
TIGHT
FIRST
SECOND
4. Tighten the crankpullerarm until the
crankarms fall off!
![Page 24: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/24.jpg)
Exceptions
Cranks with attached spindles
built-in crank remover
![Page 25: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/25.jpg)
Exceptions
BMX cranks
…use a hammer
![Page 26: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/26.jpg)
Bottom Brackets
Definition 1: Part of the frame that houses the mechanism allowing the crank arms to rotate.
Definition 2: Mechanism the fits in the frame allowing the crank arms to rotate
![Page 27: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/27.jpg)
Adjustable Bottom Bracket• Bearings can be accessed and re-greased
Adjustable Bottom Bracket
accessed and re-greased or replaced•Bearings are adjustable•Found on older bikes and some current low-end bikes
![Page 28: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/28.jpg)
Cartridge Bottom Bracket• Usually cheaper• Cannot be adjusted or disassembled• Found on newer bikes
Cartridge Bottom Bracket
![Page 29: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/29.jpg)
One-Piece Crank Bottom Bracket
One-Piece Bottom Bracket: Axle and crank arms are a single pieceFound on old American bikes and some department store bikes
![Page 30: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/30.jpg)
External Bottom Brackets• allows for bearings and spindle to be larger•more durability and more stiffness• hollow through center è lighter
External Bottom Bracket
Bearings are housed outside frame.
![Page 31: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/31.jpg)
Adjustable Bottom Bracket
Non-adjustable CupMay Be Reverse
Threaded
Crank Arm
Adjustable Cup
Axle
Cap
Bolt
Crank Arm
Lock Ring
Bearings
![Page 32: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/32.jpg)
Cutaway View
Crank Arm
Adjustable CupNon-adjustable Cup
May Be Reverse Threaded
Bolt
Lock Ring Bearings
Axle
![Page 33: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/33.jpg)
One-Piece Crank (Ashtabula) BB
Cups
Chainwheel(may be removable)
Cone Reverse Thread
Lock Nut Reverse Thread
Washer
Bearings
Cups
Crank
![Page 34: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/34.jpg)
Cutaway View
Washer
Bearings
Cone Reverse Thread
Lock Nut Reverse Thread
Crank
![Page 35: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/35.jpg)
Primary Differences
Cups face outwards and are not adjustable
Cups face inwards and one of them is adjustable
The entire crank consists of one piece
The two crankarms and axle are separate
components
![Page 36: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/36.jpg)
Cartridge Type Bottom Bracket
Cartridge (Does not come apart)Reverse Thread
Crank Arm
Lockring
Cap
Bolt
![Page 37: Bicycle Mechanics and Repair Decal Mechanical Engineering ... · Bicycle Mechanics and Repair Decal Mechanical Engineering 98 ... Definition 1: Part of the frame ... Bicycle Mechanics](https://reader031.vdocuments.mx/reader031/viewer/2022020104/5ad5e3bd7f8b9a0d2d8e3d36/html5/thumbnails/37.jpg)
View Through FrameLockring
CartridgeReverse Thread
There is no way to adjust this type of bottom bracket. It is replaced as a unit as soon as a malfunction appears.
Frame goes here
Bearings are not accessible