A laser welding apparatus (1) includes a laser welding head (5) configured to irradiate a workpiece (10) with laser light, a welding filler feeding mechanism (6) configured to supply a welding material to a position on which laser welding is performed, and a hollow structural moving mechanism (100) configured to move a welding unit (50) including the laser welding head and the welding filler feeding mechanism. The hollow structural moving mechanism has an insertion portion (3a) through which wire materials (41 and 62) of the laser welding head and the welding filler feeding mechanism are inserted.

A speed change device comprising an inner race having an outer surface, an outer race having an inner surface, and set of orbital rollers including inner rollers in rolling contact with the outer surface of the inner race and outer rollers in rolling contact with the inner surface of the outer race.

Improved bearing roller elements are disclosed. A first disclosed improvement is the addition of vanes to a ring-roller type element which allows fluids (such as liquids or gases) to flow through the bearing assembly. The fluids can then provide convection cooling. With proper configuration, the use of such vaned ring-roller elements can even allow the creation of a pump, either as part of the larger apparatus' cooling system or as a dedicated device. A second disclosed improvement, which can be used in combination with the first or in isolation, is the use of magnetic spokes in ring-roller type elements which allows them to be driven by an electromagnetic field. The use of such magnetic elements in the bearing roller elements also allows electromagnetic braking and/or regenerative braking.

A bearing assembly incorporating the roller elements in a ring configuration and using pre-load to produce additional benefits is also disclosed.

A roller bearing comprising an inner ring, an outer ring, and a bearing cage positioned between the inner ring and the outer ring. The bearing cage includes a spine and a plurality of pins disposed one side of the spine that are coplanar or offset with a plurality of pins disposed on an opposite side of the spine. A roller is rotationally coupled to each pin such that each roller is coplanar or offset with another roller on the opposite side of the spine.

A bearing arrangement having an inner race and an outer race, between which rolling elements are disposed, the rolling elements being accommodated in a bearing cage. At least one rolling element is designed as a sensor rolling element, and the bearing cage is designed as a pin cage having multiple pin elements that at least partially accommodate the rolling elements and the at least one sensor rolling element, and a sensor rolling element for a bearing arrangement of this kind are disclosed.

A bearing arrangement having an inner race and an outer race, between which rolling elements are disposed, the rolling elements being accommodated in a bearing cage. At least one rolling element is designed as a sensor rolling element, and the bearing cage is designed as a pin cage having multiple pin elements that at least partially accommodate the rolling elements and the at least one sensor rolling element, and a sensor rolling element for a bearing arrangement of this kind are disclosed.