Abstract:
An internal combustion engine includes a variable valve system wherein each cam opens and closes an intake valve and an exhaust valve via each rocker arm. A variable valve system of an internal combustion engine E includes rocker arms rocked by the action of valve driving force of cams with each lift quantity variable mechanism varying a maximum lift quantity of an intake valve and an exhaust valve. The lift quantity variable mechanism includes a lifter that is driven by the cam, and makes the valve driving force act on the rocker arm and a lifter holder that supports the lifter, and is driven by an electric motor and is rocked. The lifter is movably supported by the lifter holder. Maximum lift quantity is varied by varying a position in which the lifter abuts on the rocker arm according to a position in which the lifter holder is turned.
Abstract:
A built multiple cam is disclosed which can be produced at low cost and which can be used in a flexible manner and which requires a small amount of construction space in an axial direction. The built multiple cam comprises the following components: a first partial cam provided with a bore, a cam contour A and a joint contour which is arranged in axial proximity thereto and provided with an outer surface; a second partial cam provided with a bore, a cam contour A and a joint contour which is arranged in axial proximity thereto and provided with an outer surface; a ring which is provided with a cam contour B which is different from cam contour A and an inner contour having an inner surface, wherein the inner surface of the ring can be displaced towards the outer surfaces of the partial cams; and connections which act between the ring and the partial cam ensure a fixed connection between such components. Also disclosed is a method used to produce a built camshaft comprising at least one built multiple cam.
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:
An assembled camshaft (11) wherein at least one oil distributing sleeve (14, 26) for a camshaft setting device (15) is secured in a force-locking way to a plastically expanded portion of a shaft tube (12), wherein the oil distributing sleeve (14) includes a seat face (31) centered on the axis A of the shaft tube (12) and/or a radial contact face (32) for the camshaft setting device (15), which radial contact face (32) is aligned in a normal way relative to the axis A of the shaft tube (12).
Abstract:
The present invention relates to a camshaft (1) for more preferably motor vehicle engines with a termination element (2) arranged with an axial end side in or on the camshaft (1) and permanently joined to the latter which closes off the camshaft (1) in axial direction and which is designed as drive element for an auxiliary unit on the output side. Here it is essential to the invention that the termination element (2) is formed as a formed sheet metal part.
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. The present invention also relates to a method for manufacturing such a camshaft (1).
Abstract:
A method of manufacturing a cam for a camshaft, comprising the steps of continuously applying, to a billet having a volume larger by a specified volume than a final product, a plurality of cold forging steps formed of a preliminary outline upsetting, an outline drawing, a simultaneous piercing of inner and outer diameter surfaces, a press-molding forming excess amount as burrs on the inner diameter surface, a piercing of the inner diameter surface for removing the burrs from the inner diameter surface, and a simultaneous ironing of the inner and outer diameter surfaces. The final finishing (machining) of a cam (profile) surface can be eliminated, and the final product of the cam for the camshaft having a high dimensional accuracy can be provided.
Abstract:
An internal combustion engine including an engine housing having a cam chamber and an aperture providing access to the cam chamber. The engine also includes an insert at least partially made from plastic received within the aperture, a crankshaft coupled to the engine housing for rotation about a crank axis, and a cam shaft defining a cam shaft axis and at least partially made from plastic that is rotatably driven by the crankshaft. The cam shaft includes first and second ends and at least one cam lobe positioned between the ends. The first end is rotatably supported by the engine housing and the second end is rotatably supported by the insert. The engine also includes a metal portion coupled to either the insert or the cam shaft. The metal portion defines a flange having a face in contact with an adjacent surface of the other of the insert and the cam shaft.
Abstract:
An internal combustion engine including an engine housing having a cam chamber and an aperture providing access to the cam chamber. The engine also includes an insert at least partially made from plastic received within the aperture, a crankshaft coupled to the engine housing for rotation about a crank axis, and a cam shaft defining a cam shaft axis and at least partially made from plastic that is rotatably driven by the crankshaft. The cam shaft includes first and second ends and at least one cam lobe positioned between the ends. The first end is rotatably supported by the engine housing and the second end is rotatably supported by the insert. The engine also includes a metal portion coupled to either the insert or the cam shaft. The metal portion defines a flange having a face in contact with an adjacent surface of the other of the insert and the cam shaft.
Abstract:
A valve train for an internal combustion engine is comprised of a lubricating oil, and a camshaft which is made of an iron-based material and comprises a cam lobe and a camshaft journal. The camshaft slidingly moves on a counterpart thereof through the lubricating oil. A hard carbon film is formed on at least one of a sliding portion of the camshaft and the counterpart made of an iron-based material. A hydrogen amount of the hard carbon film is 10 atomic percent or less.