Abstract:
A mechanism for varying crankshaft timing on a belt/chain driven, dual crankshaft opposed-piston engine includes sprockets on corresponding ends of the two crankshafts, connected by a belt or chain which is tensioned by two or more tensioners. By changing the position of the tensioners the length of the two spans of the belt/chain are varied and thus the phase between the crankshafts is varied.
Abstract:
This invention relates to rotary valve systems. In its broadest aspect the invention provides an internal combustion engine having a rotary valve system (1), a combustion chamber (101) defined by a cylinder (102), and a piston (103) within the cylinder, the rotary valve system having a rotor (2A, 2B) of cylindrical construction located adjacent the combustion chamber for establishing timed, sequential communicaion between the combustion chamber and a manifold (105, 106), the rotor being characterised in having at least three coplanar ports (11) equi-spaced around the rotor circumference, said ports being interconnected via radially extending passageways (12) interior of the rotor.
Abstract:
A variable camshaft timing system for an internal combustion engine varies the relative angular position between the intake camshaft and the exhaust camshaft by controlling the path of the timing belt (16). First and second idler arms (18, 20), each having an idler wheel (22, 24) connected thereto, are independently pivoted around a common pivot point (42) by means of a pair of positioning cams (34, 36) operatively connected to an electric stepping motor (28). The motor is controlled from an electronic control unit (41) which receives signals indicating the engine operating parameters and through a look-up table steps the positioning cams which in turn pivots the idler arms to rotate the intake camshaft relative to the exhaust camshaft thereby changing the intake valve timing.
Abstract:
An ECU executes a program including the steps of: detecting engine speed NE (S100); and stopping power supply to an electric motor of an intake VVT mechanism (S104), if engine speed NE is equal to or lower than a threshold value NE (0) (YES at S102).
Abstract:
This invention relates to rotary valve systems. In its broadest aspect the invention provides an internal combustion engine having a rotary valve system (1), a combustion chamber (101) defined by a cylinder (102), and a piston (103) within the cylinder, the rotary valve system having a rotor (2A, 2B) of cylindrical construction located adjacent the combustion chamber for establishing timed, sequential communicaion between the combustion chamber and a manifold (105, 106), the rotor being characterised in having at least three coplanar ports (11) equi-spaced around the rotor circumference, said ports being interconnected via radially extending passageways (12) interior of the rotor.
Abstract:
A variable timing camshaft has concentric shafts for mechanically varying the valve timing of internal combustion engines and motors and air compressors and motors. By altering the rotational position of the cam lobes attached to each shaft (1, 2) relative to each other, the valve timing can be varied. This may be achieved by periodically changing the length of a timing chain or belt on one side of sprockets (7, 8). Alternatively, it may be achieved by a series of interconnected cogs which effectively rotate one shaft (1, 2) with respect to the other. The degree of valve lift may also be varied. Inverted cam lobes may act via pivoted rocker arms to open and close the valves. A cam follower spring maintains the tension which is kept to a minimum by means of a spring tensioning device, hydraulic piston lifter or air valve. Alternatively, the relative height of the rocker arm pivot shaft or camshaft can be varied.
Abstract:
Governor of the stroke, in internal combustion engines (10) of the stroke between camshafts (13), (14) and crankshaft (12) connected by a continuous belt (20) or chain, to compensate for any effects of wear, assembly errors, stresses due to movement and other factors and, when running speed changes, to set optimum timing values for each speed, comprising actuators (43), (44), operated by an electronic drive unit (50), that determines the variation in length of sections (30), (31) of the belt (20) between the crankshaft (12) and the camshafts (13), (14) and between the latter two, while an automatic belt tightener (21) maintains the tension of the belt (20) constant from one moment to the next.
Abstract:
A product for applying tension is disclosed. A block may have a first passage opening into the block. A body may have a first manifold and may be positioned against the block so that the first passage is open to the first manifold. The body may have a flow path for providing fluid from the first manifold to a second manifold and there through to a pressure chamber. The flow path may include a series of channels and may be configured to allow substantially unimpeded flow from the first manifold to the second manifold, and to impede flow from the second manifold to the first manifold. The flow path may be free of movable components.
Abstract:
Die Erfindung betrifft eine Vorrichtung zum Verändern der relativen Winkellage einer Nockenwelle (2) gegenüber einer Kurbelwelle mit Mitteln zum Herstellen und Lösen einer formschlüssigen Verbindung zur Drehmomentübertragung zwischen dem Antriebselement (1) und dem Abtriebselement (8) , wobei die Mittel mindestens einen an dem Antriebselement (1) ausgebildeten Eingriffsabschnitt (30) umfassen und das mehrteilige Abtriebselement (8) einen Trägerkörper (6) und mindestens einen Mitnehmer (8a, 8b) aufweist, welcher relativ zum Trägerkörper (6) geführt bewegbar und mit dem Eingriffsabschnitt (30) in Eingriff bringbar ist.
Abstract:
A system for continuously varying valve-opening overlap in reciprocating internal combustion engines changes the path of the timing belt (16) that drives the intake valve camshaft (26). An idler wheel (44) mounted on a pivoted arm (48) turns against the timing belt. At low engine speeds, the sprocket wheel idles against the timing belt. At higher engine speeds, increased engine oil pressure causes an hydraulic cylinder (58) to force the sprocket wheel against the timing belt, changing its path. As the path of the belt is changed, the intake valve position is advanced with respect to the position of the crankshaft (12). The exhaust valve position remains the same relative to that of the crankshaft. Thus at above-idle speeds, intake-exhaust valve overlap is present. Since the amount of belt path deviation is related to engine oil pressure, and thus cngine speed, valve overlap varies smoothly as a function of engine speed. A tensioner (30) maintains proper belt tensioning at all times.