Abstract: The invention relates to a planet gear having a planet carrier rotatable around an axis of rotation, comprising at least one planet wheel arranged on the planet carrier, a sun wheel and a ring gear, wherein the planet wheel is arranged in a movable manner at least radially with respect to the axis of rotation of the planet carrier. To minimize the backlash of a planet gear of this type, it is further provided that the ring gear is formed in two pieces on a plane perpendicular to the axis of rotation of the planet carrier, wherein the two halves of the ring gears can be rotated against each other and thereby effect a radial shift of the planet wheel in the direction towards the sun wheel in order to reduce backlash.

Abstract: A multistage spur-type gearing for small and miniature electric motors having a gearing housing and at least two gear shafts or axles held in the gearing housing, with spur gears of different diameters arranged on the gear shafts or axles. To achieve an extremely small construction at maximum reduction ratios in comparison with conventional spur-type gearings, at least two spur gears are fixedly connected to one another and combined to form a dual gear set, with the dual gear set rotatably supported on a gear axle made from a hard material, such as ceramics. At least one of the gear shafts should fixedly be held as a gear axle in the housing. An input shaft opening through which a motor shaft projects into the gearings is arranged to be substantially coaxial to the center axis of the gearing housing with which the gear shafts also extend in parallel and at some distance. Such a gearing makes it possible to arrange several reduction stages on one gear axle. Preferably, only two gear shafts or axles are used.

Abstract: The invention relates to a planet gear having a planet carrier rotatable around an axis of rotation, comprising at least one planet wheel arranged on the planet carrier, a sun wheel and a ring gear, wherein the planet wheel is arranged in a movable manner at least radially with respect to the axis of rotation of the planet carrier. To minimize the backlash of a planet gear of this type, it is further provided that the ring gear is formed in two pieces on a plane perpendicular to the axis of rotation of the planet carrier, wherein the two halves of the ring gears can be rotated against each other and thereby effect a radial shift of the planet wheel in the direction towards the sun wheel in order to reduce backlash.

Abstract: Methods for fabricating a friction bearing, in particular for ceramic shafts, made of metallic hardenable sintered material having an open pore volume of at least 15%, wherein the sintered material is brought into a predetermined shape and is subsequently sintered. For improving the known friction bearings in that a local wear and tear of shaft and bearing is avoided or at least considerably reduced in the region of mixed friction with high lateral forces, it is provided to harden the friction bearing after the sintering.

Abstract: A method of producing a composite material, in particular for sintered slide bearings and slide bearings.Composite materials for sintered slide bearings consist of at least one ceramic sintered material and at least one metallic sintered material and have a short service life during operation at low speeds of the shaft and in the case of a simultaneously high radial load because the lubricant stored in the bearing cracks. The novel sintered bearing is to have a long service life under such operating conditions.In the novel bearing use is made of ceramic sintered materials which have a high thermal conductivity, e.g. boron nitride.The novel composite material and the novel slide bearing are particularly suited for electric miniature motors comprising a ceramic shaft.

Abstract: The present invention refers to a planetary gearing comprising a planet carrier which is adapted to be rotated about an axis of rotation, a sun gear, at least one planetary gear, and a ring gear, at least one axle end projecting beyond one end face of said planet carrier and said planetary gear being rotatably supported on said axle end by means of its axle-reception opening. Especially in small-size planetary gearings making use of sintered components, the service life is to be improved. For this purpose, it is suggested that the planetary gear should be constructed such that it is at least radially displaceable with regard to the axis of rotation of the said planet carrier.

Abstract: A variable dashpot for motor vehicles A cylinder (2) full of vibration-suppressing fluid accommodates a piston (3). The piston is provided with vibration-suppressing valves, is fastened to a piston rod (8), and separates the cylinder into two compartments. The compartments communicate through a bypass. The cross-section of the bypass can be adjusted with a component (11) comprising a stator (12) with windings (13) and an electric motor (10) with a rotor (17). The improvement comprises making it possible to continuously and highly dynamically vary the cross-section of the bypass in a dashpot of the same size. This is attained in that the stator windings are accommodated directly in a recess (9) in the piston rod, which is made out of a material that can be magnetized, and the rotor is provided with permanent magnets (22), activates the adjusting component (11), and is accommodated in a bore in the stator (12).

Abstract: A shaft bearing assembly, particularly for a miniature electric motor. In the case of the present shaft bearing assembly, an oil-impregnated dampening disc made of an absorbent material the capillary action of which is greater than that of the porous bearing block is disposed between the thrust collar of the shaft and the axial end face of the bearing block. The shaft bearing assembly is particularly suitable for electric motors of smaller size and is effective in reducing motor noise.

Abstract: A fastening device by which a thermoplastic cover may be fixed to a tubular component. The cover fits tightly into the tubular component which is provided in the region of the cover with bores through which a lost pin is pressed after heating into the constituent material of the cover. The pin has a smaller diameter than the bore so that material displaced by the hot pin is able to flow into the bore.

Abstract: An electric motor construction is described in which the permanent magnet and a flux return element are embedded in a molded structure serving as a face plate and including seats for bearings as well as a bore for the motor shaft.

Abstract: A method for assembling a stator for an electric machine having a permanent magnet for generating a magnetic field in an air gap. Assembly of the stator is performed with the aid of a plunger, the cross section of which corresponds to the cross section of the air gap. The permanent magnet is slid into the interior of the plunger, whereas the flux return ring is slid over the same. The so formed sub-assembly is put into a casting mold adapted to be filled with a plastic material, which in its cured or hardened state forms a casing intimately surrounding the outer surface of the flux return ring and forming a face plate, to which the permanent magnet adheres. When the plastic material has set, the casting mold is opened and the plunger is retracted from the sub-assembly, resulting in a close toleranced cylindrical air gap space. After insertion of a bell-shaped rotor, a brush cover is assembled opposite the face plate.

Abstract: A stator having a plurality of permanent magnets with a cylindrically shaped outer surface and with at least one planar opposite surface is manufactured to close tolerances of the air gap with the aid of a plurality of ferromagnetic link members, equal in number to the number of permanent magnets and adapted to come into planar contact with those surfaces of said permanent magnets which are pointing away from the air gap. The permanent magnets are placed into a cylindrically shaped sleeve, the inner diameter of which corresponds to the desired inner diameter of the air gap of the stator. A sleeve of a ferromagnetic material may be used for holding said permanent magnets in intimate contact with the sleeve. The link members are shaped so as to be brought into generally planar contact with at least part of the inner surface of two adjacent ones of the permanent magnets. An adhesive is used to secure the link members to the permanent magnets.

Abstract: A method for assembling a stator for an electric machine having a permanent magnet for generating a magnetic field in an air gap. Assembly of the stator is performed with the aid of a plunger, the cross-section of which corresponds to the cross-section of the air gap. The permanent magnet is slid into the interior of the plunger, whereas the flux return ring is slid over the same. The so formed sub-assembly is put into a casting mold adapted to be filled with a plastics material, which in its cured or hardened state forms a casing intimately surrounding the outer surface of the flux return ring and forming a face plate, to which the permanent magnet adheres. When the plastics material has set, the casting mold is opened and the plunger is retracted from the sub-assembly, resulting in a close toleranced cylindrical air gap space. After insertion of a bell-shaped rotor, a brush cover is assembled opposite the face plate.

Abstract: A stator for an electrical machine, comprising an outer ferromagnetic flux return ring, a permanent magnet system arranged inside the flux return ring, and a face plate supporting the flux return ring and the permanent magnet system. The latter comprises at least four permanent magnets, each of which is shaped cylindrically at its outer surface, and an equal number of magnetically conductive link means, each of which abutts the inner surface of two adjacent permanent magnets. The link means serve to support the permanent magnets and may be bonded to the same. The stator is easy to manufacture with a low toleranced air gap and is of a rigid construction.