Abstract: An adjustable camshaft has at least one adjusting element of an adjusting system fixedly connected to inner and outer shafts that is at least partially in tight contact at the end with a connection surface which is formed by a mounting ring of the outer shaft with respect to the two shafts including the mounting ring. The connection surface is crossed by axial passages between hydraulic chambers of the adjusting system and by hydraulic liquid supply ducts which extend through the shafts, between the shafts and/or through annular gaps formed between the outer shaft and the mounting ring, from the connection surface to filling zones which are located in the peripheral surface of the mounting ring and open into circumferential ring-shaped channels associated each with a filling zone of a supply duct.

Abstract: The present invention relates to an adjustable camshaft in which an inside shaft and an outside shaft, each being fixedly connected to cams, are mounted so they are rotatable in relation to one another. To produce the relative movement, a hydraulic adjusting mechanism is provided on one of the ends thereof; in the adjusting mechanism, first and second rotatable adjusting elements are each fixedly connected to one of the two shafts opposite one another. Adjacent to the adjusting mechanism, the outside shaft is fixedly connected to a first bearing ring supporting at least the outside shaft in a stationary first abutment.

Abstract: The present invention relates to an adjustable camshaft (1) in which an inside shaft (4) is rotatably mounted with respect to an outside shaft (2). To create a relative rotational movement between the two shafts (2, 4), a hydraulic regulating device (3) is provided at one end of the camshaft (1) and a chain/belt wheel (7) that is connected to a drive, in particular to a crankshaft, via a chain or a belt is also provided. It is essential to the invention here that the chain/belt wheel (7) is designed so that it is rotatable in relation to the regulating device (3) for aligning the camshaft (1) with respect to the drive, and after successful alignment, it is connectable in a rotationally fixed manner to either the inside shaft (4) or to the outside shaft (2).

Abstract: The present invention relates to a method for grinding of cam profiles on a camshaft (1), having an inner shaft (5) and an outer shaft (4) arranged coaxially one inside the other and mounted to rotate with respect to one another. The camshaft (1) additionally has first and second cams (2, 3) that can rotate with respect to one another over a limited circumferential angle about the camshaft axis (6), the first cams (2) of which are fixedly connected to the inner shaft (5) and the second cams (3) of which are fixedly connected to the outer shaft (4). It is essential to this invention that during and/or after the grinding operation a fluid is forced under pressure into the outer shaft (4), thereby preventing penetration of grinding dust into the interspace (8) between the first cams (2) and the outer shaft (4) or flushing out any grinding dust that has already penetrated.

Abstract: The instant invention relates to a cam shaft (1) for internal combustion engines of motor vehicles, which is supported on a cylinder head housing (15) via at least one roller bearing (2), wherein provision is made for at least one thrust bearing (3), which supports the cam shaft (1) in axial direction (4) and which is embodied as ball or also as roller bearing (2).

Abstract: The aim of the invention is to provide a reliable and inexpensive camshaft wherein the inner shaft and the outer shaft can be adjusted in a low-friction manner. For this purpose, a camshaft with cams that can be rotated in relation to each other, wherein at least one first cam (3) is rotatably received on the outer shaft (1), is permanently connected to the inner shaft (2) via at least one radial opening in the outer shaft (1). Means (10) for connecting a camshaft rotational drive are provided at the axial ends of the camshaft. The camshaft is also provided with a rotational drive (9) exerting radial supporting forces onto the camshaft.

Abstract: A camshaft has contrarotating cams for automotive engines, in which an inside shaft and an outside shaft are arranged concentrically so they are contrarotating, at least one cam has at least one main cam element that can be placed radially on the outside shaft and is supported there so it can rotate. The main cam element is connected to the inside shaft in a manner that is rotationally locked via a fastener passing through a recess in the outside shaft. Further features include a fastener, a main cam element and a locking means. The fastening of the main cam element to the inside shaft is provided by widening the outside diameter of the fastener by the locking means with a resulting tightly seated connection between the fastener and the inside shaft, and the fastener and the locking means.

Abstract: The invention relates to a contoured body having an additional cam contour for effecting a valve control of a piston combustion engine that is used, in particular, for an internal exhaust gas recirculation.

Abstract: The present invention relates to an adjustable camshaft in which an inside shaft and an outside shaft, each being fixedly connected to cams, are mounted so they are rotatable in relation to one another. To produce the relative movement, a hydraulic adjusting mechanism is provided on one of the ends thereof; in the adjusting mechanism, first and second rotatable adjusting elements are each fixedly connected to one of the two shafts opposite one another. Adjacent to the adjusting mechanism, the outside shaft is fixedly connected to a first bearing ring supporting at least the outside shaft in a stationary first abutment.

Abstract: The present invention relates to an adjustable camshaft (1) in which an inside shaft (4) is rotatably mounted with respect to an outside shaft (2). To create a relative rotational movement between the two shafts (2, 4), a hydraulic regulating device (3) is provided at one end of the camshaft (1) and a chain/belt wheel (7) that is connected to a drive, in particular to a crankshaft, via a chain or a belt is also provided. It is essential to the invention here that the chain/belt wheel (7) is designed so that it is rotatable in relation to the regulating device (3) for aligning the camshaft (1) with respect to the drive, and after successful alignment, it is connectable in a rotationally fixed manner to either the inside shaft (4) or to the outside shaft (2).

Abstract: The present invention relates to a camshaft (1) having an inner shaft (3) arranged coaxially in an outer shaft (2) and mounted to rotate with respect to the outer shaft (2). The camshaft (1) has a first phase adjuster (7) and a second phase adjuster (8), the first phase adjuster (7) adjusting a phase relation of the inner shaft (3) and thus of the first cams in relation to a drive, in particular a crankshaft, while the second phase adjuster (8) adjusts a phase relation of the outer shaft (2) in relation to the drive. Thus the first and second phase adjusters (7, 8) each have a switchable hydraulic valve (9, 10), both being arranged inside the inner shaft (3).

Abstract: The invention relates to a valve control for actuating at least one valve, especially an inlet or outlet valve of an internal combustion engine, wherein the dimension of the valve lift of the at least one valve corresponds to a superposition of two cam profiles which can be adjusted in phases in relation to each other and are displaced synchronously. The aim of the invention is to improve the construction and functioning of the valve control. As a result, a guiding means between an intermediate element and the first cam profile is embodied as third cam profile which is formed in a complementary manner with respect to the first cam profile and rotates in a synchronous manner therewith.

Abstract: The present invention relates to a method for grinding of cam profiles on a camshaft (1), having an inner shaft (5) and an outer shaft (4) arranged coaxially one inside the other and mounted to rotate with respect to one another. The camshaft (1) additionally has first and second cams (2, 3) that can rotate with respect to one another over a limited circumferential angle about the camshaft axis (6), the first cams (2) of which are fixedly connected to the inner shaft (5) and the second cams (3) of which are fixedly connected to the outer shaft (4). It is essential to this invention that during and/or after the grinding operation a fluid is forced under pressure into the outer shaft (4), thereby preventing penetration of grinding dust into the interspace (8) between the first cams (2) and the outer shaft (4) or flushing out any grinding dust that has already penetrated.

Abstract: A camshaft for automotive engines in particular having contra-rotating cams capable of rotating over a limited circumferential angle about the camshaft axis in which an inside shaft (2) and an outside shaft (1) are arranged concentrically one inside the other, the contra-rotating cams (3, 4) consists of first and second cams, of which the first cam (4) is fixedly connected to the inside shaft, and the second cam (3) is fixedly connected to the outside shaft (1), the outside shaft (1) and the inside shaft (2) are mounted with respect to one another, is to be manufacturable economically and with a high manufacturing precision.

Abstract: A camshaft of an automotive engine includes two concentric contra-rotating shafts mounted one inside the other, namely an inside shaft and an outside shaft, at least one cam rotatably mounted on the outside shaft, fixedly connected to the inside shaft radially through the outside shaft via a fastening mechanism, a sleeve gripped by the fastening mechanism and inserted fixedly into aligned boreholes in the inside shaft and in the cam, a core that widens the material of the sleeve within its elasticity limits in the area of the inside shaft and is inserted into the sleeve after insertion of the sleeve into the shaft mechanism. To improve mountability, the core extends over the entire length of the sleeve and widens it beyond the area limited by the inside shaft without exceeding the upper limit of elasticity of the material of the sleeve in comparison with its uninstalled starting state.

Abstract: An adjustable camshaft, in particular for an internal combustion engine for a motor vehicle, wherein two shafts, namely one inner shaft and one outer shaft (2, 1), each fixedly connected to the cams, are rotatable in relation to one another, to create this relative movement, a hydraulic adjusting device (5) is provided at one of its ends, in the adjusting device (5), oppositely rotatable adjusting elements (6, 7) are each fixedly connected to one of the two shafts (1, 2), and the outer shaft (1) adjacent to the adjusting device (5) is at least fixedly connected to a bearing ring (3) that is supporting the shafts (1, 2) in a stationary abutment (4), is to be designed with respect to the hydraulic fluid supply devices so as to yield a small design space.

Abstract: With a camshaft for an automotive internal combustion engine in particular, having two concentrically arranged shafts mounted to rotate in opposite directions, namely an inside shaft (3) and an outside shaft (4), at least one single cam (1) fixedly connected to the inside shaft (3) by a pin (5) passing radially through the outside shaft (4) and passing radially through the outside shaft (4), a bearing of the pin (5) in the respective pin receptacles (6), each running radially, in the cam and the inside shaft (3), a lateral projection as the receptacle (6) on the cams (1), a space-saving design of the at least one adjustable single cam should be achieved. To this end, various space-saving pin receptacle designs are proposed. A space-saving measure is also provided with respect to an arrangement of an adjustable cam in close proximity to a cam fixedly connected to the outside shaft by adjustment of the shaft of the neighboring cam to the pin receptacle of the adjustable single cam.

Abstract: The present invention relates to a camshaft (1) having cams (3 and 4) rotatable with respect to one another about the camshaft axis (2) over limited circumferential angles, whereby an inside shaft (5) and an outside shaft (6) are arranged coaxially one inside the other. The cams (3 and 4) that are rotatable with respect to one another each consist of first cams (3) and second cams (4), whereby the first cams (3) are fixedly connected to the inside shaft (5) and the second cams (4) are fixedly connected to the outside shaft (6), each by means of a fixation device (8). It is essential to this invention that the first cams (3) each have a first through-bore (11) which is aligned with a respective second through-bore (12) in the inside shaft (5) when the first cam (3) is installed. In addition, the fixation device (8) is formed by two essentially identical fixation pins (10 and 10?) with respect to their axial longitudinal extent.

Abstract: A joined prefabricated individual cam (1, 2), comprising multiple cams for an adjustable camshaft in particular for an internal combustion engine of a motor vehicle, whereby the camshaft has two shafts mounted concentrically one inside the other, namely an inner shaft and an outer shaft, and the joined multiple cam is fixedly pinned to the inner shaft via radial openings provided in the outer shaft with a rotatable bearing on the outer shaft, should be easy and inexpensive to manufacture. To this end, such a multiple cam is characterized in that at least one prefabricated individual cam (1, 2) is placed as a cam ring on the outside circumference of a carrier pipe (3?) at an axial distance from the neighboring individual cams (1, 2) and is fixedly connected to this carrier pipe (3?) at a predetermined angle of rotation and axial distance assignment.

Abstract: A camshaft has contrarotating cams for automotive engines, in which an inside shaft and an outside shaft are arranged concentrically so they are contrarotating, at least one cam has at least one main cam element that can be placed radially on the outside shaft and is supported there so it can rotate. The main cam element is connected to the inside shaft in a manner that is rotationally locked via a fastener passing through a recess in the outside shaft. Further features include a fastener, a main cam element and a locking means. The fastening of the main cam element to the inside shaft is provided by widening the outside diameter of the fastener by the locking means with a resulting tightly seated connection between the fastener and the inside shaft, and the fastener and the locking means.