Abstract:
A drive valve for an internal combustion engine comprising a variable hub profile for a valve having a lever supported on a variable support point by means of a switchable support element which provides possibilities for influencing the hub profile and alternatively and cumulatively, the cam is axially displaced such that various cam paths are active on the lever.
Abstract:
A shaft (1a-d) is provided that is rotatably mounted by a journal (2) in a housing (4) in which lubricant mist is provided. One or several outward-extending ribs (6) extend between the journal and shaft sections (5a, 5b) adjacent to the journal. The shaft is mounted by the journal in the housing using a rolling bearing (3) that is lubricated exclusively by the lubricant mist. At least one of the ribs associated with the journal extends at a certain angle of attack (11, 12) to the axis of rotation of the shaft and is used as a blade for conveying the lubricant mist into the rolling bearing.
Abstract:
Cam for actuating a valve mechanism of an internal combustion engine, having a cam base circle (33), a main cam region (32) and a pre-cam region (31), which is formed between the cam base circle (33) and main cam region and directly precedes a rising section (32a) of the main cam region (32), wherein the pre-cam region (31) has a profile which effects an increase in the cam lift speed followed by a decrease in the cam lift speed followed by a further increase in the cam lift speed.
Abstract:
The cam follower has a roller, which is movable, between a first axial position and a second axial position and which alternately transmits elevations, which are different from one another. The cam has a cylinder-piston unit, which has a pressure medium space for moving the roller from the first axial position into the second axial position, and a spring means for moving the roller from the second axial position into the first axial position. The piston of the cylinder-piston unit is the roller and the roller has an end wall, which delimits the pressure medium space, and an annular collar which extends from said end wall and whose outer lateral surface serves as a cam pick-off surface. The inner lateral surface of the annular collar surrounds an outer section of the cylinder of the cylinder-piston unit.
Abstract:
A finger lever or a rocker arm (4,25,39) for a valve actuating mechanism (1) of an internal combustion piston engine comprising a roller (5) which rolls against the periphery of a cam (3) and is rotatably mounted on a pin (17) guided in side walls (18,19) of the finger lever or the rocker arm (4,25,39) which is provided with a bore (23) directed towards the periphery of the roller (5) and communicating with a lubricant duct (38), characterized in that the bore (23,27,43) has a diameter of .ltoreq.0.5 mm in the region of its smallest cross-section.
Abstract:
A sleeve-like element (14) is arranged inside a hydraulic support element to secure against drainage. In axial direction, the sleeve-like inner element (14) bears a shoulder (13) of a piston (4), formed by a rolled-in step (12). In this manner, the inner element (14) can be secured while the piston (4) maintains a uniform wall thickness.
Abstract:
A device for the simultaneous actuation of two gas exchange valves (10) of an internal combustion engine by a camshaft (11) rotatably supported in a camshaft bearing (15,16), said device comprising a bridge (3) which, with the interposition of hydraulic valve clearance compensation elements (7), is in contact with valve shaft ends (9) of the gas exchange valves (10), and a guide rail (2) on which the bridge (3) is guided for longitudinal displacement by a linear bearing (5), said guide rail (2) comprising a first oil duct (18) which opens into the linear bearing (5) and a second oil duct (22) implemented in the bridge (3), which connects the valve clearance compensation elements (7) to the linear bearing (5), and the oil passes phase-wise from the first oil duct (18) into the second oil duct (22), characterized in that a third oil duct (21) branches from the first oil duct (18) and opens into the camshaft bearing (15,16).
Abstract:
A shaft (1a-d) is provided that is rotatably mounted by a journal (2) in a housing (4) in which lubricant mist is provided. One or several outward-extending ribs (6) extend between the journal and shaft sections (5a, 5b) adjacent to the journal. The shaft is mounted by the journal in the housing a rolling bearing (3) that is lubricated exclusively by the lubricant mist. At least one of the ribs associated with the journal extends at a certain angle of attack (11, 12) to the axis of rotation of the shaft and is used as a blade for conveying the lubricant mist into the rolling bearing.
Abstract:
The invention proposes a lever-type cam follower (1) which, for mounting a pin (7) for a cam roller, comprises bores (5, 6) in the region of its side walls (2, 3). The diameter of the bore (5) is larger than the diameter of the bore (6). Corresponding ends (8, 9) of the pin (7) are configured so that when mounted, the pin (7) is fixed in the bores (5, 6) by a press fit. Thus, the pin (7) can be inserted with its second end (8) at first through the larger bore (5) without causing damage to its raceway (8a) during assembly. At the same time, the press fit guarantees an excellent fixture of the pin (7) in the cam follower (1) with an all-round contact.
Abstract:
The fluid friction clutch has a clutch cover mounted rotatably in relation to a rotatingly driven input shaft, which cover is divided by a partition into a reservoir for shear fluid and a working chamber. In the working chamber there is arranged a rotor driven in rotation by the input shaft, which rotor together with the partition and the cover defines shear gaps. A valve device controls the inflow of shear fluid in the working chamber. From the internal circumference of the working chamber a baffle body of the cover protrudes inwards into an annular chamber between the internal circumference and the external circumference of the rotor. Behind the baffle body in the drive direction of rotation of the rotor, a transfer opening is provided in the partition. On the side of the baffle body facing the rotation axis (1) an elevated portion of the partition adjoins, which constricts the shear gap between the partition and the rotor. In the circumferential direction the elevated portion overlaps with the transfer opening and prevents the shear fluid built up by the baffle body from flowing radially inwards into the shear gap. The elevated portion increases the pump performance of the baffle body, so that even residual quantities of shear fluid can be pumped away better out of the working chamber and the idling rotation rate of the clutch can be lowered.