摘要:
A variable timing duration camshaft has an outer shaft (1) and coaxial inner shaft (2) adapted so that the shafts (1, 2) are relatively slidable but not rotatable about each other. The outer shaft (1) has valve control lobes located on its outer surface and a valve control lobe modifying segments (4) is located on the inner shaft (2) and is slidingly fitted into a mating slot (5) in the outer shaft and in the valve control lobe whereby longitudinal axial movement of the inner shaft (2) relative to the outershaft by a control means (13, 14) causes the modifying segment (4) to move longitudinally and circumferentially relative to the valve control lobes thereby varying the duration.
摘要:
A valve timing control device for an internal combustion engine, comprises a drive rotary member rotated by a crankshaft of the engine, a driven rotary member to rotate a camshaft of the engine upon rotation of the drive rotary member; a rotational phase control mechanism having an intermediate rotary member rotated relative to the drive and driven rotary members to cause relative rotation between the drive and driven rotary members and an braking mechanism having a hysteresis brake that generates a braking force to cause the intermediate rotary member to rotate relative to the drive and driven rotary members.
摘要:
A variable valve timing apparatus rotatably receives a rotor in a housing. The rotor can rotate within a predetermined angular range. In some cases, the rotor is locked by a lock pin at an intermediate position within the angular range. In this manner, it is possible to realize a suitable valve timing even when an engine is restarted after it is stopped. In some case, the rotor is prevented from moving to the largest delay angle position by a restricting pin. In this manner, it is possible to prevent the rotor from reaching the largest delay angle position before the engine is stopped. On the other hand, while the engine is operated, it is possible to rotate the rotor to the largest delay angle position and to realize a valve timing responsive to the state of operation.
摘要:
A valve stroke control for an internal combustion engine of a motor vehicle has a control device for adjusting a valve stroke. It interacts with a camshaft and a control shaft. The control device is actuated by a hydraulic medium and has a first control element and a second control element movable relative to one another. The first control element is sleeve-shaped and the second control element is received in the first control element. A rocker lever is acted on by the camshaft. The first control element is supported on the rocker lever and the second control element is supported on the control shaft.
摘要:
In an internal combustion engine with two camshafts arranged next to one another and each mounted in a radial bearing in the cylinder head and hydraulic device for rotary angle adjustment of each camshaft with respect to a crankshaft. The supply and discharge of hydraulic pressure medium to and from the devices are controlled separately in each case by an electromagnetic hydraulic valve comprised of an electromagnet and of a valve housing capable of being plugged into a valve receptacle. Each valve housing on its circumference has a plurality of annular grooves with a plurality of radial orifices and on its free end face has a further orifice, via which the hydraulic valves are fluidically connected to the radial bearings of the camshafts and to a pressure connection and to a tank connection. Valve receptacles are passage bores which are fluidically connected via horizontal transverse ducts to the radial bearings of the camshafts and to the pressure connection. The separation of individual fluid streams is caused by an adapter sleeve plugged axially onto each valve housing and having a plurality of radial bores.
摘要:
The invention concerns a rotary piston adjuster for adjusting the angular position of the camshaft of an internal combustion engine, said adjuster comprising an outer rotor having at least one hydraulic chamber, and an inner rotor comprising at least one pivoting vane that can pivot hydraulically in the hydraulic chamber between a retard stop position and an advance stop position. A locking device suitable for detachably connecting the outer and inner rotors to each other and at least one compression spring acting in opposition to the frictional torque of the camshaft are arranged between the two rotors. A liberal design of the compression spring and a low-wear operation with this spring are enabled by the fact that the compression spring (27, 27′) is arranged in an attachment (4) that is connected to the rotary piston adjuster, and the components of the attachment have a wear-resistant configuration and support the compression spring (27, 27′) at least pointwise over its entire length.
摘要:
The present invention provides an improvement over conventional engine controls by providing a method and system that operates a variable valve system immediately subsequent to engine start, and disengages the variable valve system when engine performance is unacceptable. If the variable valve system is disengaged after engine start due to poor engine performance, a time delay occurs to allow the engine to create a sufficient amount of oil pressure to operate the variable valve system.
摘要:
An electronically controlled engine management system for adjusting camshaft timing, taking into account mechanical deficiencies of a variable camshaft timing mechanism and compensating the mechanical deficiencies by manipulating the amount and/or timing of the fuel injection. The engine management system enables the operator to enjoy high torque and good fuel efficiency representative of the compensated adjustable camshaft timing system.
摘要:
A variable camshaft phase adjustment device (phaser) for an internal combustion engine having at least one camshaft. The phaser has a housing having an outer circumference for accepting a drive force, and a rotor connected to a camshaft coaxially located within the housing. The housing and the rotor are capable of rotation to shift the relative angular position of the camshaft and the crankshaft. The spool valve comprising a spool slidably mounted within a bore in the rotor. In the spool a chamber is present that has an input communicating with the bore the spool is mounted in, an output communicating with the outside, and an air flow restriction. Hydraulic fluid from the input communicating with the bore is prevented from communicating with the outside by the air flow restriction. The air flow restriction is either in the input communicating with the bore or the output communicating with the outside.
摘要:
A valve control mechanism for an internal combustion engine includes a camshaft carrying cams which cooperate with and thereby actuate valves which control the induction of fluids into, and the exhaustion of fluids from, a combustion cylinder during the operating cycle of an engine. The camshaft is axially movable within a predetermined range of movement. At least one of the cams has a profile which, when viewed in a plane perpendicular to the axis of the camshaft, varies as a function of the position along the camshaft axis and is such that, when the camshaft is moved axially to one extreme of its permitted movement, interaction between the cam and the valve with which it is associated generates no valve movement when the cam is rotated.