| 摘要 |
1480676 Friction clutches MACLEANFOGG LOCK NUT CO 19 May 1975 [20 May 1974] 21278/75 Heading F2C In a centrifugal clutch for a motor vehicle accessory drive wherein segmental friction shoes 69 carried by a driven drum 61 are biased by springs 73 into engagement with a driving drum 45 and are released therefrom by centrifugal force to limit the maximum output speed, the driven drum and an end plate 63 form a sealed chamber surrounding the driving drum 45 and lubricating and cooling liquid is circulated through the chamber and additionally forms a fluid bearing between the driving and driven drums. The lubricating and cooling liquid may be supplied to the chamber from the vehicle's engine cooling system. The liquid enters the chamber through a duct 75 and leaves through a coaxial duet 79. The friction shoes 69 are made of sintered metal and have grooves 74 in their friction surface. The driven drum 45 is made of steel and may, as shown, be secured to an engine crank-shaft 13. In Figs. 5 and 6 (not shown) the driving drum is connected to the engine crank-shaft by a further centrifugally engaged friction clutch which disengages at a speed below engine idle to relieve the engine of load during starting. |
