Abstract: A lubricating device for a bearing across which a gas pressure gradient exists includes a piezoelectric tubule operating as a pump receiving a lubricant and introducing the lubricant into a propellant gas stream passing through the bearing due to a pressure gradient across the bearing. At least one sensor determines the operating state of the bearing and an electric current supply is connected between the at least one sensor and the piezoelectric tubule.

Abstract: For generating liquid droplets which may pass into the lungs of a person, a resonance system is used which contains a rotation-symmetrical metal body with a disc-shaped base plate, a working plate, a neck connecting the working plate to the base plate as well as a piezoceramic vibrator. The vibrator is coupled to the plane base surface which extends perpendicularly to the symmetry axis of the metal body. The base plate is also provided with a parabolic reflector surface. The center of the working plate is in the vicinity of the reflector focal point, optionally mirrored with respect to the base area of the base plate, of the parabolic reflector surface. In this design, ultrasound waves excited by the vibrator are focused into the region of the working plate, thereby atomizing a liquid which is held by the working plate.