Abstract:
A valve actuation system is described containing a collapsible pushrod device for use in a reciprocating piston machine cylinder such as an engine. The collapsible pushrod device replaces a conventional pushrod. The system can include a driver base, plunger, and a deactivation pin assembly. In normal operation, the pins lock the driver base and plunger together thereby providing regular valve motion. Under selected conditions, the pin assembly controller unlocks the driver base from the plunger. Valve lift is reduced or eliminated. When eliminated, the cylinder is deactivated. The system can vary the effective compression ratio between higher for cold starting and other selected operating conditions and lower for warmed-up running, as well as trap additional exhaust residuals to assist starting and light load. This is especially useful for Diesel engines. Various means may be used to unlock the pins including oil pressure, bi-metal spring temperature, or electromagnetic activation. The telescoping motion which limits the motion of the valve may occur in one or more steps.
Abstract:
A camshaft rotates in forward and reverse directions in conjunction with a rotation of a crankshaft in the forward and reverse directions. An intake cam and a sub-intake cam are provided at the camshaft. The intake cam acts on an intake valve within a range of a crank angle corresponding to an intake process by integrally rotating with the camshaft. The sub-intake cam is rotatable within a constant angular range with respect to the camshaft, thereby being movable between a normal position and a start-up position in a circumferential direction of the camshaft. During the rotation of the crankshaft in the reverse direction, the sub-intake moves to the start-up position by rotating with a delay relative to the intake cam.
Abstract:
The invention relates to a valve drive device for an internal combustion engine, having an axially displaceable cam element (10) and having an adjusting device (11) which comprises a first engagement element (12) which is provided to displace the cam element (10) axially into a first switching position, and which comprises a second engagement element (13) which is provided to displace the cam element (10) axially into a second switching position, wherein the adjusting device (11) has a first slotted guide track (14), in which the first engagement element (12) is guided in the first switching position, and has a second slotted guide track (15), in which the second engagement element (13) is guided in the second switching position, wherein the first engagement element (12) is configured so as to be positively coupled to the second engagement element (13), and wherein the adjusting device (11) comprises a triggering device (16) which is provided to hold the first engagement element (12) fixedly in the second switching position counter to a restoring force, and to a method for axial displacement of a rotating cam element (10) from a first switching position into a second switching position, having an adjusting device (11), wherein a first engagement element (12) is positively coupled to a second engagement element (13), and wherein the first engagement element (12) is held fixedly in the second switching position by a triggering device (16) counter to a restoring force.
Abstract translation:本发明涉及一种用于内燃机的气门驱动装置,该气门驱动装置具有可轴向移动的凸轮元件(10)并具有调节装置(11),该调节装置包括第一接合元件(12),该第一接合元件设置成使凸轮元件 )轴向地切换到第一切换位置,并且所述调节装置(11)包括第二接合元件(13),所述第二接合元件设置成使所述凸轮元件(10)轴向移动到第二切换位置,其中所述调节装置(11)具有第一开槽导轨 其中第一接合元件(12)在第一切换位置中被引导,并且具有第二槽形引导轨道(15),其中第二接合元件(13)在第二切换位置中被引导,其中, 第一接合元件(12)构造成可靠地联接到第二接合元件(13),并且其中调节装置(11)包括设置用于保持第一接合元件(12)的触发装置(16) F (10)从第一切换位置轴向移动到具有调节装置(11)的第二切换位置的方法,其中第一接合 (12)与第二接合元件(13)形锁合地连接,并且其中所述第一接合元件(12)通过触发装置(16)固定地保持在所述第二切换位置中以克服复位力。
Abstract:
The present invention provides a variable valve mechanism of an internal combustion engine, which includes a rocker arm that is driven by a cam so as to swing to drive a valve, a switching pin that is attached to the rocker arm so as to be shifted between a first position and a second position, a shift device that shifts the switching pin from the first position to the second position, and a return spring that returns the switching pin. In the variable valve mechanism, a drive state of the valve is switched by shifting the switching pin, the rocker arm is formed to have such a dimension that one end of the switching pin is exposed while projecting outward from the rocker arm, and the return spring is externally fitted to the one end of the switching pin so as to be exposed outside the rocker arm.
Abstract:
A valve actuation system is described containing a collapsible pushrod device for use in a reciprocating piston machine cylinder such as an engine. The collapsible pushrod device replaces a conventional pushrod. The system can include a driver base, plunger, and a deactivation pin assembly. In normal operation, the pins lock the driver base and plunger together thereby providing regular valve motion. Under selected conditions, the pin assembly controller unlocks the driver base from the plunger. Valve lift is reduced or eliminated. When eliminated, the cylinder is deactivated. The system can vary the effective compression ratio between higher for cold starting and other selected operating conditions and lower for warmed-up running, as well as trap additional exhaust residuals to assist starting and light load. This is especially useful for Diesel engines. Various means may be used to unlock the pins including oil pressure, bi-metal spring temperature, or electromagnetic activation. The telescoping motion which limits the motion of the valve may occur in one or more steps.
Abstract:
A valve train assembly comprises: a rocker arm (2) comprising: a first body (10) supporting a first axle (24) on which a first roller (22a, 22b) for engaging a first rotatable cam surface (34, 36) is mounted, whereby at least part of the rocker arm (2) can be pivoted by at least the first rotatable cam surface (34, 36) acting on the first roller (22a, 22b) to move a valve (4) to cause a first valve even. The rocker arm (2) further comprises a second body (8) supporting a second axle (43) on which a further roller (26) for engaging a further rotatable cam surface (38) is mounted, whereby at least part of the rocker arm (10) can be pivoted by the further rotatable cam surface (38) to move the valve (4) to cause a second valve event. One of the first (10) and second (8) bodies is pivotally mounted with respect to the other of the first (10) and second (8) bodies. The rocker arm (2) is configurable in a first mode of operation in which one of the first and second valve events occurs and a second mode of operation in which both the first and second valve events occur or the other of the first and second valve events occurs. The rocker arm (2) further comprises a latching mechanism (40) for latching and unlatching the first (10) and second (8) bodies together and wherein which of the first and second modes the rocker arm (2) is configured in depends upon whether the first (10) and second (8) bodies are latched or are unlatched. The latching mechanism (40) comprises a latch member (80) moveable between a latched position wherein it latches the first (10) and second (8) bodies together and an unlatched position in which the first (10) and second (8) bodies are unlatched The valve train assembly further comprises a latching actuator (94) for moving the latch member (80) between the latched position and the unlatched position and wherein the latching actuator (94) comprises a rotatable shaft (96) attached to a biasing means (98), wherein rotating the rotatable shaft (96) from a first position to a second position causes the biasing means (98) to move the latch member (80) between the latched position and the unlatched position.