Abstract: A ball bearing cage has a radially encircling, annular body, on which in the circumferential direction, substantially evenly distributed, axially projecting webs having a predefinable axial length are arranged. The webs form a plurality of axially open ball pockets on one side for accommodating a corresponding number of balls having a predefinable ball diameter. At least for one web, a guide section is formed to bring same into an engagement with a running groove of a ball bearing ring. The axial length of the webs corresponds to at least the ball diameter. There is also described a ball bearing having such a ball bearing cage.

Abstract: A two-part ball bearing cage includes two, in particular at least substantially identical, cage parts forming an even-numbered plurality of ball pockets for receiving a corresponding number of balls having a predeterminable ball diameter. Each cage part has an annular body on which substantially evenly distributed webs are disposed in the circumferential direction to form the ball pockets. A distance in the circumferential direction between two webs that are adjacent in the circumferential direction approximately corresponds to the sum of twice the ball diameter and a width of the web in the circumferential direction. A ball bearing having the ball bearing cage and a method for assembly of the ball bearing are also provided.

Abstract: The dental handpiece consists of a housing with a handle and a turbine that can be operated with compressed gas or compressed air. The rotational movement of the turbine driven by compressed gas is transmitted to the dental tool via a rotor shaft and a chuck. The rotor shaft is rotatably supported by at least one axial groove ball bearing. The radial rigidity required for operating a dental handpiece is achieved by axially preloading the ball bearings. Projections on the housing and the shaft disc of the at least one axial groove ball bearing allow the axial groove ball bearing to be used as radial groove ball bearings. The proposed design of the dental handpiece exhibits little power loss or frictional loss in comparison to dental handpieces with radial groove ball bearings, and slip and drilling friction components can be virtually completely prevented in particular.

Abstract: A dental handpiece and method of turbine support therein, comprises a turbine wheel having a rotor shaft rotatably supported by a housing via ball bearings, and configured to rotationally drive a clamping chuck, at least one of the ball bearings including, an inner ring arranged on the rotor shaft, the inner ring having a raceway, an outer ring, having an outer raceway movably supported by the housing, and balls arranged between and guided by the inner and outer raceways. The raceway of the inner ring, in cross section, has a concave shape with a curvature corresponding to a radius of the balls. Optionally, the raceway of the outer ring in cross section, has, in a central area, a first curvature with a first radius and, adjoining the central area, a second curvature with a second radius, the first radius being smaller than the second. Optionally, the raceway of the outer ring has a substantially parabolic profile.

Abstract: A ball bearing cage has a radially encircling, annular body, on which in the circumferential direction, substantially evenly distributed, axially projecting webs having a predefinable axial length are arranged. The webs form a plurality of axially open ball pockets on one side for accommodating a corresponding number of balls having a predefinable ball diameter. At least for one web, a guide section is formed to bring same into an engagement with a running groove of a ball bearing ring. The axial length of the webs corresponds to at least the ball diameter. There is also described a ball bearing having such a ball bearing cage.

Abstract: A two-part ball bearing cage includes two, in particular at least substantially identical, cage parts forming an even-numbered plurality of ball pockets for receiving a corresponding number of balls having a predeterminable ball diameter. Each cage part has an annular body on which substantially evenly distributed webs are disposed in the circumferential direction to form the ball pockets. A distance in the circumferential direction between two webs that are adjacent in the circumferential direction approximately corresponds to the sum of twice the ball diameter and a width of the web in the circumferential direction. A ball bearing having the ball bearing cage and a method for assembly of the ball bearing are also provided.

Abstract: A ball bearing cage includes a plurality of ball pockets, wherein each ball pocket serves for receiving a ball, wherein each ball pocket (12, 22) has a width (B) in axial direction of the ball bearing cage (10, 20) and a length in circumferential direction of the ball bearing cage (10, 20), with the width (B) being slightly greater than a diameter of the ball (30), wherein the length is greater than the width (B) of the ball pocket (12,22) at least at an outer circumference (UA) of the ball bearing cage (10), and the length (LA) of the ball pocket (12,22) at the outer circumference (UA) of the ball bearing cage (10) is greater than the length (LI) of the ball pocket (12,22) at the inner circumference (UI) of the ball bearing cage (10,20).

Abstract: A dental handpiece and method of turbine support therein, comprises a turbine wheel having a rotor shaft rotatably supported by a housing via ball bearings, and configured to rotationally drive a clamping chuck, at least one of the ball bearings including, an inner ring arranged on the rotor shaft, the inner ring having a raceway, an outer ring, having an outer raceway movably supported by the housing, and balls arranged between and guided by the inner and outer raceways. The raceway of the inner ring, in cross section, has a concave shape with a curvature corresponding to a radius of the balls. Optionally, the raceway of the outer ring, in cross section, has, in a central area, a first curvature with a first radius and, adjoining the central area, a second curvature with a second radius, the first radius being smaller than the second. Optionally, the raceway of the outer ring has a substantially parabolic profile.

Abstract: In order to make a bearing, such as a roller bearing, insensitive to a lack of maintenance lubrication or irregular maintenance lubrication while at the same time retaining its mechanical performance, at least one bearing part of the bearing is provided at least partially with an oleophilic adhesion promoter layer. The adhesion promoter layer binds a lubricant layer of the bearing to the bearing part provided with the adhesion promoter layer. The adhesion promoter layer is bonded to an elemental-iron-free surface of a bearing part body. The removal of free iron from the bearing part body surface is carried out with nitric acid, chromate solution and/or citric acid. The treated bearing part has an oleophilic anti-corrosion adhesion promoter layer. The bearing may be used in pressure-operated devices, in particular in turbine handpieces used by dentists, because the loss of the lubricant layer during operation of the device was particularly high.

Abstract: In order to make a bearing, such as a roller bearing, insensitive to a lack of maintenance lubrication or irregular maintenance lubrication while at the same time retaining its mechanical performance, at least one bearing part of the bearing is provided at least partially with an oleophilic adhesion promoter layer. The adhesion promoter layer binds a lubricant layer of the bearing to the bearing part provided with the adhesion promoter layer. The adhesion promoter layer is bonded to an elemental-iron-free surface of a bearing part body. The removal of free iron from the bearing part body surface is carried out with nitric acid, chromate solution and/or citric acid. The treated bearing part has an oleophilic anti-corrosion adhesion promoter layer. The bearing may be used in pressure-operated devices, in particular in turbine handpieces used by dentists, because the loss of the lubricant layer during operation of the device was particularly high.

Abstract: The present invention relates to a cage for a rolling bearing, in particular for a ball bearing, to a rolling bearing with a cage and to the use of a cage in a high-speed rolling bearing with a characteristic speed value n×dm>1,000,000 mm/min, in particular for industrial spindle-bearing applications and in the medical sector, in particular in dental technology.

Abstract: A ball bearing cage includes a plurality of ball pockets, wherein each ball pocket serves for receiving a ball, wherein each ball pocket (12, 22) has a width (B) in axial direction of the ball bearing cage (10, 20) and a length in circumferential direction of the ball bearing cage (10, 20), with the width (B) being slightly greater than a diameter of the ball (30), wherein the length is greater than the width (B) of the ball pocket (12,22) at least at an outer circumference (UA) of the ball bearing cage (10), and the length (LA) of the ball pocket (12,22) at the outer circumference (UA) of the ball bearing cage (10) is greater than the length (LI) of the ball pocket (12,22) at the inner circumference (UI) of the ball bearing cage (10,20).

Abstract: The present invention relates to a cage for a rolling bearing, in particular for a ball bearing, to a rolling bearing with a cage and to the use of a cage in a high-speed rolling bearing with a characteristic speed value n×dm>1,000,000 mm/min, in particular for industrial spindle-bearing applications and in the medical sector, in particular in dental technology.