Abstract: A measuring device for arranging in tubular cavities of machine elements has a deformation body with a deformation region. A respective press-in ring element is secured to two opposite ends of the deformation body. The deformation body can be introduced into a tubular cavity of a machine element through a press-in opening using a press-in force such that mechanical effects acting on the machine element can extend to the deformation region by the press-in ring elements and can be detected by a sensor secured to the deformation region. The press-in ring elements have a ring element thickness that is so low that the deformation body can be reliably introduced into the tubular cavity and can be stored therein in a force-fitting manner while the cavity circumference of the tubular cavity is designed to have a non-circular shape, or has high tolerance variations, such as those found in pipes for example.

Abstract: A machine element includes a sensor device for detecting mechanical stresses affecting a hollow cylindrical shaft section. The sensor device is arranged in the hollow cylindrical shaft section positively connected with axial pretension between a first radially inwardly protruding formation and a second radially inwardly protruding formation. The machine element can be produced by first forming a first radially inwardly protruding formation in the hollow shaft section of the machine element. In a subsequent sensor arrangement step, a sensor device is fitted positively in the hollow shaft section on the first radially inwardly protruding formation. Then the second radially inwardly projecting formation is produced in the hollow shaft section in a subsequent joining step. Thereby, the sensor device is joined positively with an axial pretension between the first radially inwardly protruding formation and the second inwardly protruding formation.