| 摘要 |
PURPOSE:To aim at reducing the cost of an engine and as well at enhancing the efficiency of energy, by arranging, in an auxiliary intake-air passage, a mechanical supercharger which is driven at a speed equal to a multiple of the speed of a crankshaft, and as well by providing a balancer in a certain amount on the rotary section of the supercharger to constitute a secondary balancer for the engine. CONSTITUTION:Upon low speed rotation of an engine a positive displacement type mechanical supercharger 23 disposed in an auxiliary intake-air passage 8 is effective to supply fresh air from the auxiliary intake-air passage in a sufficient compressed condition. Then, even if throttle valves 13, 22 are fully opened by a link 25 associated thereto to increase the rotational speed of the engine, no turbo-lag is brought about since the supercharger 23 is driven by a crank shaft 5. Meanwhile upon high speed rotation of the engine a usual supercharger 15 disposed in a main intake-air passage 7 is effective. At this time a rotor 26 eccentric from the rotating center of the supercharger 23 and a balancer 27 arranged in parallel thereto are rotated at a speed equal to a multiple of the speed of the crank shaft 5, and therefore the secondary vibration of the engine may be absorbed. |
