A component for the transmission and absorption of mechanical forces and moments includes at least one dimensionally stable component element having at least one hollow-profiled section extending along a longitudinal axis of the dimensionally stable component element, and at least one hollow-profiled component element consisting of fibre-reinforced plastic extending along a longitudinal axis of the hollow-profiled component element. The hollow-profiled component element is partially received by the hollow-profiled section of the dimensionally stable component element in a form-fitting manner. The component is produced by a method that includes the steps of inserting one end of the one hollow-profiled component element into the hollow-profiled section of the dimensionally stable component element and pressing the outer circumference (26) of the hollow-profiled component element (16) against the inner circumference (24) of the hollow-profiled section (14) by an inflatable element.

A hammer drive mechanism is provided for converting rotary drive from a motor to reciprocatory movement of an impact member of a hammer drill. The mechanism comprises a rotatable plate adapted to be rotated by the motor, an input drive member associated with the rotatable plate in an eccentric position with respect to the axis of rotation of the rotatable plate, an output drive member associated with the impact member, and a crank shaft having a respective driver adjacent each of its ends. Each driver engages with, and is complementary to a respective one of the drive members. At least one end portion of the crank shaft comprises a lubricating aperture which opens into the adjacent driver to provide a lubrication path to the engaging surfaces of the drivers and the drive members.

An apparatus includes a connecting rod having a surface that defines an opening to receive a pin for coupling the connecting rod to a piston at a first end of the connecting rod. The surface includes a groove arrangement to collect, retain and distribute lubrication fluid in the space between the pin and the inner surface. The surface can be formed by the connecting rod or a bushing in an opening of the connecting rod.

The invention relates to a component for absorbing and/or transmitting mechanical forces and/or moments, comprising at least one dimensionally stable component element (12, 12, 12, 2, 12), which has at least one hollow-profiled section (14), and at least one hollow-profiled component element (16) consisting of fiber-reinforced plastic, which can be partially received by the hollow-profiled section (14) of the dimensionally stable component element (12, 12, 12, 12, 12), and can be arranged in a form-fitting manner in the hollow-profiled section (14) of the dimensionally stable component element (12, 12, 12, 12, 12) by means of raised portions (32, 32) which extend radially inwards and/or depressions (38, 38), recesses or holes which extend radially outwards, wherein the inner circumference (24) of the hollow-profiled section (14) of the dimensionally stable component element (12, 12, 12, 12, 12) and the outer circumference (26) of the hollow-profiled component element (16) consisting of fiber-reinforced plastic correspond to each other or at least substantially correspond to each other. The invention further relates to a method for the production thereof and the use thereof.