Abstract:
PROBLEM TO BE SOLVED: To restrain the deterioration of engine performance when any performance is deteriorated among a plurality of oil pumps, in an engine having a variable valve gear. SOLUTION: This variable valve gear has at least two or more of hydraulic driving parts for driving variable valve systems 10 and 12, an oil pump 3 supplying oil to a hydraulic apparatus and a lubricating part of the engine including the hydraulic driving parts, an assist pump 8 arranged other than the oil pump 3 for enhancing hydraulic fluid pressure supplied to the hydraulic driving parts from the oil pump 3, a performance deterioration determining part for determining performance deterioration in the assist pump 8, and a stopping control means for stopping the supply of a hydraulic fluid to at least one hydraulic driving part when determining the performance deterioration in the assist pump 8 by the performance deterioration determining means. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an engine variable valve gear in a simple, lightweight, compact and highly reliable construction, which allows easy setting of the valve opening characteristics of intake and exhaust valves to reduce friction loss. SOLUTION: The engine variable valve gear includes turnable camshafts 19, 20 to be turned at predetermined angles for valve opening operation of engine valves (9, 10) from a fully closed state to a fully opened state, telescopic cylinders 21, 22 each having a telescopic portion 33 at one end and a movement input portion 34 at the other end, and arranged perpendicularly to the turnable camshafts 19, 20, and cylinder moving means (23, 24) located near the movement input portions 34 of the telescopic cylinders 21, 22 for moving the telescopic cylinders 21, 22 in the axial directions, respectively. The telescopic portions 33 of the telescopic cylinders 21, 22 are crank-connected to the turnable camshafts 19, 20, respectively. By giving telescopic action to the telescopic cylinders 21, 22 at predetermined timings, the turnable camshafts 19, 20 are turned to open the engine valves 9, 10. By using the cylinder moving means (23, 24) for moving the telescopic cylinders 21, 22 in the axial directions, the maximum valve lift amounts of the engine valves (9, 10) are varied. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a variable valve system having reduced axial length and having a driving mechanism and a control axle which facilitate manufacturing and assembling work therefor, and can be connected easily. SOLUTION: The variable valve system is provided with a variable mechanism which revolves the control axle 19 with the driving mechanism 24 to change a swing position of a rocker arm, thus changing a valve lift amount of an intake valve. At an axially intermediate position on an outer circumference of the control axle, a projection section 28 with a female screw hole 28c formed on a tip side thereof is integrally provided, and a linkage plate 33 is fixed onto the projection section with a fixture bolt 48. A pin 52 inserted into a pin insertion hole in the linkage plate and a linkage arm 37 connect the control axle and a ball nut 36 of a ball screw mechanism 32. COPYRIGHT: (C)2009,JPO&INPIT