An evaluation test method for flaking caused by hydrogen embrittlement includes: preparing a rolling bearing having a first bearing ring, a second bearing ring, and a rolling element, the first bearing ring being a rotation ring including a first raceway surface, the second bearing ring being a stationary ring including a second raceway surface facing the first raceway surface, the rolling element being disposed between the first raceway surface and the second raceway surface; and applying a rotation around a central axis onto the first bearing ring in a state in which a load is applied between the first raceway surface and the second raceway surface through the rolling element. Each of the first bearing ring, the second bearing ring, and the rolling element is composed of a steel. The first raceway surface and the second raceway surface are always entirely immersed in lubricating oil during the rotation.

Wear detection in a plain bearing is proposed, with a first component comprising at least one sliding element of plastics material, which has a sliding surface for mobile guidance of a second component relative to the first component. The first component, in particular the sliding element, has a device for detecting wear in a critical region of the sliding element, in particular at the sliding surface thereof, with a transponder and with a detector element which cooperates with the transponder and is arranged on the sliding element. The detector element changes the behavior of the transponder when a predetermined degree of wear is reached in the critical region of the plastics sliding element, such that the wear-induced change is wirelessly detectable. The system and detection method are particularly advantageous for plain bearings for a lubricant-free bearing arrangement.

Wear detection in a plain bearing is proposed, with a first component comprising at least one sliding element of plastics material, which has a sliding surface for mobile guidance of a second component relative to the first component. The first component, in particular the sliding element, has a device for detecting wear in a critical region of the sliding element, in particular at the sliding surface thereof, with a transponder and with a detector element which cooperates with the transponder and is arranged on the sliding element. The detector element changes the behavior of the transponder when a predetermined degree of wear is reached in the critical region of the plastics sliding element, such that the wear-induced change is wirelessly detectable. The system and detection method are particularly advantageous for plain bearings for a lubricant-free bearing arrangement.

A measuring device with a crankshaft and a load cell for determining a radial force acting on the crankshaft having a receiving sleeve for receiving a bearing ring and a fastening ring for attaching the load cell in a transmission housing. Axial support areas are provided on the fastening ring for axially supporting the outer ring of the first bearing. Moreover, measuring regions for receiving radial forces of the receiving sleeve are provided which connect the receiving sleeve with the fastening ring. Strain sensors are attached to at least two of the measuring regions. An evaluation electronics is connected to the strain sensors.

A measuring device with a crankshaft and a load cell for determining a radial force acting on the crankshaft having a receiving sleeve for receiving a bearing ring and a fastening ring for attaching the load cell in a transmission housing. Axial support areas are provided on the fastening ring for axially supporting the outer ring of the first bearing. Moreover, measuring regions for receiving radial forces of the receiving sleeve are provided which connect the receiving sleeve with the fastening ring. Strain sensors are attached to at least two of the measuring regions. An evaluation electronics is connected to the strain sensors.

The present invention discloses a compilation method for a reliability test load spectrum of a high-speed bearing of an electric drive system. The method comprises the following steps: based on load data of a whole life cycle of an electric drive system, correlating a leading failure load of a high-speed bearing; counting an action frequency of each load level by a multi-dimensional load joint counting method; constructing a bearing mechanical balance equation; determining a reliability test load level by damage contribution distribution and cumulative damage contribution distribution of different load levels; according to a principle of a consistent overall frequency and consistent damage, determining a time of the reliability test load level; and in combination with extreme load working conditions, finally constructing a reliability test load spectrum of the high-speed bearing. The constructed reliability test load spectrum is correlated to an actual failure mode, which can effectively verify a reliability level of the high-speed bearing, shorten reliability test time and provide support for high-quality development of the high-speed bearing.

The present invention discloses a compilation method for a reliability test load spectrum of a high-speed bearing of an electric drive system. The method comprises the following steps: based on load data of a whole life cycle of an electric drive system, correlating a leading failure load of a high-speed bearing; counting an action frequency of each load level by a multi-dimensional load joint counting method; constructing a bearing mechanical balance equation; determining a reliability test load level by damage contribution distribution and cumulative damage contribution distribution of different load levels; according to a principle of a consistent overall frequency and consistent damage, determining a time of the reliability test load level; and in combination with extreme load working conditions, finally constructing a reliability test load spectrum of the high-speed bearing. The constructed reliability test load spectrum is correlated to an actual failure mode, which can effectively verify a reliability level of the high-speed bearing, shorten reliability test time and provide support for high-quality development of the high-speed bearing.

A rotary electric machine includes a bearing that holds a rotation shaft and is capable of rotating the rotation shaft, a housing accommodating the bearing, a rotor that is fixed to the rotation shaft and rotates, and a stator that is fixed to the housing. The stator includes a stator core including a tooth portion protruding toward the rotor and extending along the rotation shaft, a winding wound around the stator core, and magnetic detectors attached to an end portion of the stator core in a direction in which the rotation shaft extends while being separated from each other in a rotation direction of the rotation shaft.

A rotary electric machine includes a bearing that holds a rotation shaft and is capable of rotating the rotation shaft, a housing accommodating the bearing, a rotor that is fixed to the rotation shaft and rotates, and a stator that is fixed to the housing. The stator includes a stator core including a tooth portion protruding toward the rotor and extending along the rotation shaft, a winding wound around the stator core, and magnetic detectors attached to an end portion of the stator core in a direction in which the rotation shaft extends while being separated from each other in a rotation direction of the rotation shaft.

A sensor system for monitoring a device, the sensor system including a housing, a base configured to attach the sensor system to the device to be monitored, a sensor configured to obtain data related to at least one operating parameter of the device, and an integral energy harvesting device configured to provide at least a portion of the energy required to operate the sensor system.