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The Clutch

The Clutch. Andrew Hanna Dan Taub Danny Zirkel. Que es clutch?. Is it: A: a firm grasp? B: a handbag without handles? C: A group of eggs fertilized at the same time, typically laid in a single session and (in birds) incubated together ?

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The Clutch

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  1. TheClutch Andrew Hanna Dan Taub Danny Zirkel

  2. Quees clutch? • Is it: • A: a firm grasp? • B: a handbag without handles? • C: A group of eggs fertilized at the same time, typically laid in a single session and (in birds) incubated together? • D: a device that enables two revolving shafts to be joined or disconnected as required, esp one that transmits the drive from the engine to the gearbox in a vehicle ? • E: all of the above?

  3. Exploded!

  4. Our Exploded

  5. Back Plate / Hub • Purpose: • Connected to main shaft; transfer rotational energy from clutch basket to transmission.

  6. Basket • Purpose: • House the clutch plates; connected to the primary chain. • Specs: • 48 teeth (engine sprocket has 18 teeth) • Gear ratio of 2.67/1

  7. Friction Plate / Smooth Plates • Purpose: • Friction plate: connected to clutch basket • Smooth plate: connected to inner hub • When clutch engaged: both spin freely • When clutch not engaged: prevent slippage with surface friction between plates (allow transfer of energy between basket and hub) • Specs: • Plate thickness: 1/8 in • Plate diameter: 4.95 in

  8. Primary Chain • Purpose: • Transfer rotational energy from engine sprocket to clutch basket. • Specs: • 3/8 x 7/32 in • 62 links • Duplex

  9. Cups / Springs • Purpose: • Compress the clutch plates together when clutch is not engaged. • Specs: • Free length: 1.4 in • Compressed length (for testing): .77 in • Force applied during testing: 40lbs=177.93N • Spring constant: 761lbs/ft = 11,120.55 N/m

  10. Lever • Purpose: • Utilize mechanical advantage to lower the force needed on the handle. • Specs: • Distance from pivot to push rod: .25 in • Distance from push rod to applied force from cable: 2.5 in • Mechanical advantage: 5:1

  11. Push Rod / Adjustment Screw • Purpose: • Transfer of mechanical energy from the lever to the pressure plate. • Specs: • Length: 7.01 in • Diameter: .156 in

  12. The Science Behind • How much force is required to depress the clutch? • (Measurements based on ’58) • Force to release clutch without any mechanical advantage: ~200lbs • Divide by mechanical advantage of lever (5:1): ~40lbs • Divide by mechanical advantage of clutch handle (2.5/.6 =4.2:1): ~9.5lbs (with no friction)

  13. Slippage • Symptoms: Engine revs but no corresponding acceleration. • How: Clutch slippage is when the clutch plates are slipping across each other, rather than engaging and transferring engine torque to the drive train. • Why: The cause can be a poorly adjusted clutch, or worn springs, or worn plates. • Our clutch slips at between 6 and 9 ftlbs with well-compressed springs.

  14. ’58: The Devil’s Dance • Clutch was heavy, noisy • During testing, clutch cable “snapped” • Solution 1: We used emory paper to smooth out the teeth on the driven clutch plates, then buttoned up and attached new cable • Consequences: “Oh, well that’s just awful.”

  15. ‘58 (continued) • Solution 2: We lubed cable to stop noise; tightened adjustment screw for better push-rod connection • Consequences: “…still worse than it’s ever been.” • Solution 3: Run cable along a straighter path (reduce friction) • Consequences: “The best this clutch has ever felt!”

  16. ‘59: Re-assembly • Original parts: • Back plate / hub • Lever • Pushrod • Springs/cups/screws • Adjustment screws • New parts: • Basket • Friction plates • Driven plates • Cable

  17. Re-assembly

  18. Dis wus the best present-A-tion ah eva did see! Clutch Photoshoot ‘13

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