Item 0751
BUY: PT - Clutch - Soft-Start - Centrifugal - SMC Axle Clutch
Picture:
Drawing:
Specifications:
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Kart Racing Engines |
5 HP to 60 HP |
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Two Stroke or Four Stroke |
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Gear Ratios |
4.00:1 to 11.0:1 (Two Stroke engines) |
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1.50:1 to 6.0:1 (Four Stroke engines) |
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Inside (Axle) Diameters |
1.000 in, 1.250 in, 1.375 in, 1.750 in (1) |
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|
30 mm, 35 mm, 40 mm |
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Outside Diameter |
6.50 inches (165 mm) (2) |
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Width |
3.375 inches (86 mm) |
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Weight |
6.5 to 9.0 pounds (3.0 to 4.1 kg) |
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Sprocket Mount Dimensions |
4.625 in I.D., six bolts 5.250 in B.C. |
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Rotation |
Clockwise or Counterclockwise |
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Recommended Lubricant/Coolant |
SMC Racing Clutch Oil |
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Alternate Lubricant/Coolant |
Automatic Transmission Fluid |
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Oil Capacity |
10 Ounces (300 mL) |
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Adjustments |
External, no tools required |
DESIGN Modification Notes:
(1) It appears that there is a keyway in the bore. If it is a rectangular key then the bore can probably be increased to 1.970" diameter. Under the remote chance that it is a square key then the bore can probably be increased to 2.094" diameter. This may help regarding the insertion of an overrunning clutch.
(2) The outside of the clutch has fins. The clutch is engaging and disengaging very infrequently, therefor it may be possible to machine off the fins or at least crown to OD by machining off the sides. This will help a little with headroom.
Notes re Go-carting:
The cart wheel diameter is about 10" and the circumference is about 32". Sprint and Enduro are both tracks, the sprint being a shorter one; not a straight away drag race. Maximum go-cart engine speeds are 14,000 to 19,000 rpm. The horsepower of cart engine is from 5 hp to 35 hp+, but low torque because of the rpm. The largest engines are 125 cc (135 cc in Europe). The clutches engage at an engine speed of around 10,200 rpm. With given ratios this give clutch engagement rpm's of 927 to 2,372 rpm. John A. thinks that SMC might be able to make custom housings with the sheave grooves in them.
The rotors are going to be rotating at 600 - 650 rpm.
Note re Lubrication:
The original idea for power-train lubricating will probably not work since the clutch has its own self contained wet system.
Questions:
Can the clutch operate when it is horizontal?
Will the clutch handle the load?
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Last Revised: September 22, 2001