Abstract:
A device provided on a internal combustion piston engine for changing the rotational relations between at least one camshaft (5) and a crankshaft (6) includes a hydraulic cylinder (4). This hydraulic cylinder (4) is acted upon by a supply unit (7, 14) which displaces gas cushions in the hydraulic cylinder (4) when the internal combustion piston engine is at a standstill and replaces the gas cushions with hydraulic cylinder, especially motor oil.
Abstract:
The invention relates in particular to a camshaft setting mechanism according to the vane cell principle, which has a drive gear (1) joined with the crankshaft through a toothed belt or a control chain. The drive gear includes a hollow space (8), and an impeller (11) is installed in the hollow space (8). The impeller is fixedly connected to and rotates with the camshaft (14). The drive gear (1) has at least one working chamber (4) on the interior of its circumferential wall (2), and each vane (12) of the impeller (11) subdivides the working chambers (4) into two pressure areas (9, 10) in each case. To avoid leakage through the slits (13) between impeller (11) and the drive gear (1) at high oil temperatures, the impeller (11) is made of a material which has a higher thermal expansion coefficient than the material of the drive gear (1), and that the pressure areas (9, 10) in the hollow space (7) of the drive gear (1) are sealed off by thermal expansion of the impeller (11) when the motor is in operation.
Abstract:
A valve timing control device (1) for varying opening and closing times of gas exchange valves of an internal combustion engine, characterized in that, in at least one of the pressure chambers (5, 6), there is arranged at least one spring means (13) whose spring force acts on the adjusting piston (4) to counteract an undesired adjusting direction (delayed opening and closing times t.sub.N+) of the adjusting piston (4) caused by a drag and frictional torque M.sub.S of the camshaft (2) during operation of the internal combustion engine, whereby the drag and frictional torque M.sub.S in a low-speed, low-load range of the internal combustion engine is substantially counteracted by an oppositely directed torque M.sub.F obtained from the spring force of the spring means (13).
Abstract:
A device for changing the control times of gas exchange valves of an internal combustion engine, including a drive wheel in driving connection with a crankshaft and a vane wheel connected to rotate with a camshaft. A plurality of hydraulic working spaces are formed within the device and are divided by the vanes of the vane wheel into respectively A and B pressure chambers. The vane wheel can be mechanically coupled to the drive wheel by a locking element, which is displaceable by a spring element into a locking position within a seat in one of the sidewalls of the drive wheel, and is hydraulically moved into an unlocked position in the vane wheel upon application of pressure to the pressure chambers. The locking element is a generally uniform cylindrical locking pin, and is arranged in an axial bore in the hub of the vane wheel. The longitudinal axis of the axial bore has a smallest possible distance from the longitudinal mid-axis of the device. The seat has a generally quadrilateral shaped contour that is larger by a play on all sides than the cross sectional area of the locking element, and includes a worm groove opening into it for supplying pressure medium.
Abstract:
The invention concerns a device for the hydraulic adjustment of the angular position of a shaft (1) relative to a drive pinion (14), said device comprising a plate (2) fixed to the shaft to cooperate with the drive pinion (14) or with a component fixed to the drive pinion. The device comprises at least one ring-segment shaped section (2a) in the plate (2) and a means (4a) arranged on the drive pinion (14) or on said component to cooperate with the shaped section (2a) so as to divide the shaped section into two separate chambers (10, 11). The device further comprises a means for a selective hydraulic pressurization of the chambers (10, 11) for adjusting the relative angular position of the drive pinion (14) and the shaft (1).
Abstract:
A device provided on a internal combustion piston engine for changing the rotational relations between at least one camshaft (5) and a crankshaft (6) includes a hydraulic cylinder (4). This hydraulic cylinder (4) is acted upon by a supply unit (7, 14) which displaces gas cushions in the hydraulic cylinder (4) when the internal combustion piston engine is at a standstill and replaces the gas cushions with hydraulic cylinder, especially motor oil.
Abstract:
An electromagnetic actuator for operating a setting member includes an electromagnet which has a housing provided with a recess having an opening; a yoke body having a surface constituting a pole face of the electromagnet; and a solenoid surrounding the yoke body. The yoke body and the solenoid are accommodated in the housing recess. An armature, to which the setting member is coupled, is guided for motions towards and away from the pole face in a space adjoining the electromagnet. The opening of the housing recess faces the space. A resetting spring exerts a force opposing a motion of the armature towards the pole face.
Abstract:
An arrangement for controlling a device for changing the control times of gas exchange valves of an internal combustion engine is provided. The device includes a hydraulic pressure cylinder with an axially movable piston the setting motions of which are transformed into relative rotation of a drive part of the pressure cylinder connected to the crankshaft in relation to a drive part of the pressure cylinder connected to the camshaft. the hydraulic pressure cylinder is subdivided by the piston into two pressure chambers (3, 4), with each being provided with a pressure medium connection (5, 6) to which a hydraulic pump (7) is connected upstream and a pressure medium reservoir (8) is connected downstream, and whose pressure medium inflow or pressure medium outflow is controlled by a hydraulic valve arrangement controlled by a motor controller (9).
Abstract:
In a device (1) for varying the opening and closing times of gas exchange valves of an internal combustion engine, an undesired start rattling occurring during the starting operation of the internal combustion engine due to an abutment of an adjusting piston (7) against its end position is to be prevented. For this purpose, the invention provides a coupling means (21) which connects a drive unit (4) and a driven unit (11) during the starting operation of the internal combustion engine.
Abstract:
A device (3) for adjusting valve timing in an internal combustion engine, disposed on a drive pinion (4) within a control gear of at least one camshaft (2) mounted in a cylinder head (1), which drive pinion (4) is in driving relationship with said camshaft (2), said device (3) comprising an adjusting piston (5) axially displaceable by a hydraulic medium and having two oppositely oriented helical gear sections (6,9), and first of said two helical gear sections (6) cooperates with a corresponding gear (7) of a driving element (8) connected to the drive pinion (4), while second of said two helical gear sections (9) cooperates with a gear (10) of a driven element (11) connected to the camshaft (2), an end region of the camshaft (2) facing the device (3) being circumferentially surrounded by a connecting bracket (14) positioned, as seen in camshaft direction, behind the device (3) and comprising at least one pressure medium connection (19) for hydraulic medium supply to the adjusting piston (5) characterized in that the connecting bracket (14) is made in one piece with a valve housing (16) of a hydraulic control valve which permits an optional feeding of hydraulic medium into one of two pressure chambers (12,13) defined on each side of the adjusting piston (5).