A combined cam shaft assembling method comprises the following steps: A, grinding the outer diameter of a steel pipe (2) to specified precision, and machining an inner hole of a cam sheet (1) and a signal disc to specified precision; B, pre-installing the cam sheet (1) and the signal disc onto the steel pipe (2) according to a specified sequence, distance and angle; C, utilizing a tension part (3) to penetrate through the steel pipe (2), ensuring the steel pipe (2) to be expanded, so as to fix the cam sheet (1) and the signal disc onto the steel pipe (2) and reach a specified torque. The method is carried out through a combined cam shaft assembling device. By adopting the tension part (3) to expand the steel pipe (2), the steel pipe (2) and the cam sheet (1) can be rapidly combined, the cam sheet (1) and the signal disc can be clamped onto the steel pipe (2) in a more reliable manner, and the strength of the entire cam shaft is relatively high.

A camshaft contains a support tube, on which components including at least one cam are arranged at predetermined locations. The support tube extends at least partially through a hole in the components, and wherein a press fit is produced between the support tube and the components by hydroforming. Accordingly, at least one locally formed material formation is provided between the support tube and the hole. Via the material formation, the component is retained at the location in a desired orientation relative to the support tube in such a way that the support tube having the mounted components can be fed for hydroforming.

A method of manufacturing an end piece for a camshaft may include forming a shape of an end piece to be coupled to a camshaft by compacting steel and powder in a net-shape manner and by sintering steel and a powder compact that are preassembled to each other.

Disclosed herein is a method for assembling a module for a motor vehicle engine, which module comprises at least one supporting structure with bearing seats and at least one camshaft which is mounted rotatably in the bearing seats, the camshaft being constructed during the assembly of the module from a support shaft which is configured at least in sections as a hollow shaft and components which are to be connected to the support shaft at predefined joining positions. The method includes providing a supporting structure having bearing seats, positioning components to be affixed to a support shaft in a preliminary position with respect to the bearing seats, pushing the support shaft through the bearing seats and through-openings of the components, enlarging portions of the outer diameter of the support shaft at defined joining positions thereof, and axially moving the components on the support shaft onto the joining positions.

Provided is a concentric camshaft and a method of manufacturing the same, in which at least one of a fixed cam and a rotatable cam is a sintered cam configured to fix the cam and an inner piece through diffusion bonding, capable of reducing a machining amount, simplifying a manufacturing process because a heat treatment process for improving cam surface hardness is unnecessary, and being applied to an engine having a small space because the weight is reduced through a weight-reducing structure of a surface of the cam and a width of the inner piece is reduced.

A device for jointing a plurality of elements, each comprising a cutout for a shaft, in a predetermined angular position on the shaft, may include a traversable guide carriage configured to push the shaft from above through the cutouts of the elements. The device may also include an electrical spindle drive and a pneumatic piston for displacing the traversable guide carriage.

A method of manufacturing a pipe member includes arranging a pre-pipe member between first and second dies, moving one of the first and second dies to be closer to another one and holding the pre-pipe member with first and second recess portions, by the moving of the one of the first and second dies, and pressing an outer peripheral surface of the pre-pipe member with first and second inner surfaces in a closed state of the dies. By the pressing of the outer peripheral surface of the pre-pipe member, reducing a diameter of a portion of the pre-pipe member and forming a reduction portion having a polygonal shape so that the reduction portion has a same number of outer surfaces as a total number of the first inner surfaces and the second inner surfaces.

A camshaft includes a carrier shaft which can be mounted rotatably along a shaft axis and at least one cam pack disposed axially displaceably on the carrier shaft. The cam pack includes at least two cams and at least one adjusting member for axial adjustment of the cam pack. The cams and the at least one adjusting member are connected to one another in an axially adjacent configuration and can be mounted axially displaceably as a composite structure in a direct configuration on the carrier shaft. A method for producing a camshaft and a cam pack are also provided.

A method for manufacturing cams for a camshaft is disclosed. The method includes finish-forging the cam with at least one chamfer. The chamfer is not reworked after finish-forging. According to an example. the cam is finish-forged with the chamfer with an angle of 540 to a cam bearing surface.