Abstract:
A valve train device for an engine is configured to pivot a rocker arm supported on a rocker arm support shaft to drive a valve which opens and closes a valve opening formed in a combustion chamber. The device comprises a valve drive device and a swing member pivotally supported on a swing member support shaft and driven to pivot about the swing member support shaft by the valve drive device. A control arm is disposed between a swing cam surface formed on the swing member and a rocker-side surface formed on the rocker arm. The control arm is configured for transferring motion of the swing cam surface to the rocker-side surface. A displacement mechanism is provided for displacing a contact point between the control arm and the swing cam surface and a contact point between the control arm and the rocker-side surface. The rocker-side surface has an arcuate shape which arcs about a center of pivoting motion of the swing member and wherein the rocker-side surface or an extension of the rocker-side surface about said center of pivoting motion of the swing member passes in substantially near a center of swing of the rocker arm.
Abstract:
A camshaft for automotive engines in particular, comprising at least one first cam (5′) and at least one cam segment (6) which is rotatable to a limited extent with respect to the first cam (5′) and exercises the full or partial function of a second cam (4), with which an inner shaft (3) and an outer shaft (2) are arranged concentrically one inside the other and also rotatably with respect to one another, the first cam (5′) and the cam element (6) surround the outer shaft (2) on the periphery at least in part, the first cam (5′) is fixedly connected to the outer shaft (2), and the respective cam segment (6) is connected to the inner shaft (3) in a rotationally fixed manner, the cam segment (6) is provided with an inside circumferential surface extending over only a section of the circle running concentrically in a circular cylindrical pattern with respect to the inner shaft (3) and the outer shaft (2), the inside circumferential surface of the cam segment (6) is supported on a guide area (2′) formed by the outer shaft (2) or fixedly connected to it, is to be assembled from completely machined parts to form a finished camshaft which does not need to be post-machined, such that there is no change in geometry on the completely machined parts. To this end, such a camshaft is characterized by the following features: the cam segment (6) is mounted on the guidance area (2′) provided for the outer shaft (2) by means of a tongue-and-groove connection (8, 9) running on a circular section that is limited at the circumference, whereby the circular section is designed to be coaxial with the outer shaft (2) and the inner shaft (3), the cam segment (6) which is connected to the inner shaft in a rotationally fixed manner is displaceable with respect to the inner shaft (3) to a limited extend radially.
Abstract:
A cam gear is formed from a resinous material containing 100 parts by weight of polyamide and 5 to 20 parts by weight of modified polyolefin.
Abstract:
A valve actuation system and method for use in an internal combustion engine including at least one combustion cylinder having a piston and an engine valve. The valve actuation system includes a hydraulic pump, a high-pressure reservoir, and an electro-hydraulic valve actuator. The hydraulic pump is configured to produce a hydraulic output based on a valve-piston clearance profile of at least one cylinder of the combustion engine. The high-pressure reservoir is coupled with the hydraulic pump. The electro-hydraulic valve actuator is coupled with the high-pressure reservoir via a first control valve and configured to actuate at least one engine valve of the combustion engine according to an output of the hydraulic pump.
Abstract:
Systems and methods for actuating engine valves are disclosed. The systems may include primary and auxiliary rocker arms disposed adjacent to each other on a rocker arm shaft. The primary rocker arm may actuate an engine valve for primary valve actuation motions, such as main exhaust events, in response to an input from a first valve train element, such as a cam. The auxiliary rocker arm may receive one or more auxiliary valve actuation motions, such as for engine braking, exhaust gas recirculation, and/or brake gas recirculation events, from a second valve train element. A hydraulic actuator piston may be disposed between the auxiliary rocker arm and the primary rocker arm. The actuator piston may be selectively locked into an extended position between the primary and auxiliary rocker arms so as to selectively transfer the one or more auxiliary valve actuation motions from the auxiliary rocker arm to the primary rocker arm.
Abstract:
A method and device for achieving complete combustion and greater efficiency throughout a broad range of power outputs in a four-stroke internal combustion engine intended for use mostly at sea level by providing a means of controlling the amount of air to be compressed in a fixed ratio to the amount of fuel to be injected together with a means of controlling of the volume to which the fuel-to-air mixture is to be compressed prior to ignition in a fixed optimum ratio to the volume of air taken in with an ability to use different octane fuels and a power stroke that is always longer than the adjusted compression stroke in order to yield greater work output at lower exhaust pressure than engines designed for equal compression and power stroke operation. This reduces fuel consumption, noise and pollution and improves total engine efficiency to 35-40%.
Abstract:
A method and a device for operating an internal combustion engine improve the response of the internal combustion engine and increase its torque. An exhaust valve of the combustion chamber of the internal combustion engine is opened during a discharge phase of the internal combustion engine for discharging exhaust gas, generated via combustion, from a combustion chamber into an exhaust system of the internal combustion engine. The exhaust valve is closed again and re-opened during this discharge phase.
Abstract:
Engines and methods of controlling an engine may involve at least one fluid actuators associated with one or more engine intake and/or exhaust valves. Timing of valve closing/opening and use of an air supply system may enable engine operation according to a Miller cycle.
Abstract:
A lobe-less cam for use in a springless poppet valve system is disclosed including a cam shaft having at least one surrounding region, at least one asymmetrical cam groove formed in the at least one surrounding region, and wherein the at least one asymmetrical cam groove has a lift portion and a descent portion.
Abstract:
A forced opening and closing valve operating system for changing the operating characteristics of an engine valve according to low speed running conditions and high speed running conditions of the engine, includes a low-speed free rocker arm that swings by following a low speed valve-opening cam and a low speed valve-closing cam, a high-speed free rocker arm that swings by following a high speed valve-opening cam and a high speed valve-closing cam, and a valve operating rocker arm that is sandwiched between the low-speed and high-speed free rocker arms and is connected to an engine valve for driving the engine valve in both valve-opening and valve-closing directions. The rocker arms are swingably supported on a rocker shaft. Connection switching means switches alternatively connecting the valve operating rocker arm to the low-speed and high-speed free rocker arms. Thus, the valve operating system is compact, and noise generation is prevented.