Abstract: A linear motion drive device including a ball screw, a linear motion table driven by the ball screw to move linearly, and an abnormality detection device configured to detect a decrease in a preload applied to the ball screw. The abnormality detection device includes a vibration sensor configured to measure vibration during operation of the ball screw, a calculation processing unit configured to acquire a vibration value of a vibration signal in a specific frequency band among vibration signals measured by the vibration sensor, and an abnormality detection unit configured to determine that a decrease in the preload has occurred in the ball screw when the vibration value is less than a previously determined threshold with respect to a reference value, the reference value being a vibration value in an initial stage of the operation of the ball screw or during a normal operation of the ball screw.

Abstract: A gas turbine engine has a bearing housing mounted to structure linked to the engine mounting pads. The bearing housing has bearing housing flanges with bearing housing flange openings aligned with attachment flange openings of the structure. Some of the bearing housing flange openings are slots. A first group of fasteners extends through one of the attachment flange openings and through one of the bearing housing flange openings. A second group of fasteners extends through one of the attachment flange openings and through one of the slots. The first group of fasteners are sacrificial fasteners configured to fracture in response to a load on the bearing housing exceeding a fracture load. The bearing housing is displaceable relative to the structure after fracture of the sacrificial fasteners via the second group of the fasteners moving within and relative to respective ones of the slots.

Abstract: A bearing support includes at least one sliding bearing defined by the bearing support and/or at least one rolling-element bearing having an outer raceway defined by the bearing support. The bearing support is formed from a fiber-plastic composite and includes an integrally formed sliding surface of the sliding bearing and/or an integrally formed raceway for rolling elements of the rolling-element bearing, and the fiber-plastic composite includes a matrix into which spatially oriented sliding fibers, for example, PTFE fibers, are embedded in a region of the sliding surface of the sliding bearing and/or a region of the raceway of the rolling-element bearing.

Abstract: A rotary machine including a rotary shaft rotatably disposed in a casing is provided. The rotary machine includes an end plate disposed at one end side of the casing in the axial direction. The rotary machine includes a recess section formed in the end plate and recessed toward the inside of the casing. The rotary machine includes a through hole formed in the recess section and through which one end section of the rotary shaft is inserted. The rotary machine includes a shaft grounding device which is provided in the recess section. The shaft grounding device is brought into contact with the one end section of the rotary shaft which is inserted through the through hole, and eliminates a shaft voltage generated in the rotary shaft.

Abstract: A bearing isolator and explosion-proof current diverting device may be configured to dissipate an electrical charge from a rotating piece of equipment to ground, such as from a motor shaft to a motor housing. One aspect of an explosion-proof current diverter ring may include a stator that may be mounted to the equipment housing and a rotor that may be mounted to a shaft. The rotor may rotate with the shaft. A conductive assembly may be positioned in a radial bore formed in the stator such that the conductive assembly contacts the rotor to conduct electricity from the shaft to the housing through the explosion-proof current diverting device. The explosion-proof current diverting device may be configured to define a flame path to achieve various explosion-proof certifications.

Abstract: The present invention resides in an assembly comprising a first steel component that is joined to a second steel component by a weld joint formed in a hybrid welding process, whereby at least one of the first and second steel components comprises a through-hardened bearing steel. In the hybrid welding process, base material of the first and second steel components is melted and a moulten filler material comprising at least 90% Nickel is added. The weld joint is formed after solidification of the moulten base material and of the moulten filler material. According to the invention, the weld joint comprises a central solidified portion and a peripheral solidified portion, whereby the central solidified portion comprises at least 80% filler material and the peripheral solidified portion comprises no more than 20% filler material.

Abstract: A rotational assembly includes a mating surface and an interlocking surface disposed in driving engagement with a cooperable interlocking member of a driving mechanism. A plurality of receptors is defined in the mating surface. A bearing element is received in each of the plurality of receptors for reducing frictional interaction between the mating surface of the rotational assembly and a complementary mating surface of an interacting component. A retainer is defined in the mating surface at each of the receptors providing rotational retention of each of the bearing elements within its corresponding receptor.

Abstract: A bearing assembly cooperates with a bearing seat formed in a bearing housing. The assembly includes a bearing having an inner ring, an outer ring and a rolling element in engagement with the inner ring and the outer ring, and an anti-rotation device. The anti-rotation device engages the outer ring of the bearing and with the bearing housing to limit the rotation of the outer ring of the bearing within the bearing seat formed in the bearing housing. The anti-rotation device includes a first feature for engagement with the outer ring of the bearing and a second feature for engagement with the bearing housing.

Abstract: The present invention provides a member for a rolling bearing (1) which is capable of decreasing the amount of carbon dioxide generated from a polymeric member in discarding the rolling bearing, contributing to restraint or prevention of an increase in the concentration of the carbon dioxide in the atmosphere or a decrease of the concentration thereof in the atmosphere, and allows a continuous use temperature to be high and an endurance time to be long and a rolling bearing using the member. The member for the rolling bearing (1) is composed of a molding of a polymeric elastic body or a synthetic resin composition. The member is at least one member selected from among an inner ring (2), an outer ring (3), rolling elements (4), a retainer (5), and a sealing member (6). A raw material derived from a biomass is at least partially used for a producing raw material of a polymeric matrix composing the polymeric elastic body or the synthetic resin composition.

Abstract: It is an object of the present invention to provide a resin composition whose flowability is secured when the resin composition is injection-molded into injection-molded articles such as a resin-made crown-shaped cage and a resin-made seal both for a rolling bearing and a resin-made sliding bearing and which is capable of enhancing the mechanical strengths and toughnesses of these injection-molded articles to such an extent that these injection-molded articles can be used as bearing members. The resin composition is formed into a molded article and used as a bearing member. The resin composition is composed of polyamide resin or polyester resin to which polycarbodiimide is added. The polyamide resin is at least one resin selected from among polyamide 66 resin and polyamide 11 resin. The polyester resin is polytrimethylene terephthalate resin. 0.5 to 6 wt % of the polycarbodiimide is contained in an entirety of the resin composition.

Abstract: In an embodiment, a roller bearing apparatus may include a rotor having first superhard raceway elements distributed circumferentially about an axis. Each first superhard raceway element includes a raceway surface positioned/configured to form a first portion of a raceway. The apparatus includes a stator including second superhard raceway elements generally opposed to the first superhard raceway elements. Each second superhard raceway element includes a raceway surface positioned/configured to form a second portion of the raceway. The apparatus includes rolling elements interposed between the rotor and stator and positioned and configured to roll on the raceway. One or more of the rolling elements may be configured to elastically deform on the raceway during use. At least a portion of the raceway exhibits a first modulus of elasticity greater than a second modulus of elasticity of at least a portion of the one or more of the rolling elements.

Abstract: A dust-proof housing device is adapted for a bearing assembly and includes a housing body that includes two housing-half walls, each of which has a central hole defining an axi s , and an inner peripheral end surrounding the central hole. A dust-proof cover has a fixing ring fitted in the inner peripheral end of at least one of the housing-half walls, and an annular flexible member secured to the fixing ring.

Abstract: A rotational assembly includes a mating surface and an interlocking surface disposed in driving engagement with a cooperable interlocking member of a driving mechanism. A plurality of receptors is defined in the mating surface. A bearing element is received in each of the plurality of receptors for reducing frictional interaction between the mating surface of the rotational assembly and a complimentary mating surface of an interacting component. A retainer is defined in the mating surface at each of the receptors providing rotational retention of each of the bearing elements within its corresponding receptor.

Abstract: To prevent a problem due to gas produced from an adhesive and to improve the productivity of a rolling bearing apparatus. The present invention provides a method of manufacturing a rolling bearing apparatus, including fitting a first rolling bearing and a second rolling bearing to a first member each in a pressed state, pressing the inner races of the first and second rolling bearings in a direction in which they are closer to each other in the axial direction with a second member sandwiched between outer races of the first and second rolling bearings, and welding at least a portion of a peripheral portion of the inner race of the pressed second rolling bearing in the axial direction to the outer face of the first member through irradiation with laser light.

Abstract: The present invention provides a member, for a resin-made rolling bearing, which has a low extent of a moisture absorption-caused change in its dimension and mechanical properties, keeps sufficiently high mechanical properties after the member absorbs moisture, and is excellent in its resistance to hydrolysis, grease deterioration, and heat and also provides the rolling bearing in which the member for the rolling bearing is used. A rolling bearing (7) has an inner ring (8), an outer ring (9), a plurality of rolling elements (10) interposed between the inner ring (8) and the outer ring (9), a crown-shaped cage (11) for retaining the rolling elements (10), and a seal (12) covering an opening disposed at a gap between the inner ring (8) and the outer ring (9). The cage (11) and the seal (12) are moldings of a resin composed of polyphthalamide resin.

Abstract: A bearing cage (10) for a rolling-element bearing is split in the circumferential direction along at least one cutting line (11-1; 11-2) between a first and a second bearing cage section (12-1; 12-2). A projection (14) and a corresponding opening (15) are respectively formed on opposing bordering surfaces (13-1; 13-2) of the cutting line between the first and second bearing cage sections, and are configured to fix the bordering surfaces to each other in three directions upon meshing of the projection with the opening. A main axis (17-1; 17-2) of projection and opening extends at an angle (?) oblique to the rotational axis (16) of the bearing cage.

Abstract: Bearing component (10) comprising steel and at least one flash butt weld joint. The steel comprises, by weight, max 20 ppm S and max 15 ppm O and in that said steel includes sulphide inclusions and less than 5% of the sulphide inclusions contain encapsulated or embedded oxide inclusions.

Abstract: Method for manufacturing a bearing ring (14, 34, 36) from at least one steel bar (12) having ends. The method comprises the steps of forming said at least one steel bar (12) into at least one ring segment and flash butt welding the ends (12a, 12b) of said at least one ring segment to make a ring. The method also comprises the step of carburizing at least part (C) of a surface (12c, 12d) of said at least one steel bar (12) which is adjacent to said surface (12a, 12b) that is to be flash butt welded prior to said flash butt welding.

Abstract: A rolling element bearing comprises a groove with preferably an indentation in the bottom down the middle of the groove all around the bearing. The groove is to both accommodate a Bragg grated optical fibre and to increase the perceived sensitivity of the optical fibre by weakening the bearing and thereby creating larger deformation for specific loads/vibrations than if the groove was not there.

Abstract: The present invention provides a grease composition having an excellent fretting wear resistance in a wide temperature region from low to high temperatures and particularly even at low temperatures and a rolling bearing in which the grease composition is packed. A grease composition (7) is packed inside a grease-packed bearing (1). The grease composition (7) contains base oil, a thickener, and an additive. The additive contains at least, one kind selected from among a phosphite ester shown by a chemical formula (1) or a phosphite ester shown by a chemical formula (2). The content of the phosphite ester is 0.5 to 4 parts by weight for 100 parts by weight which is the total of the amount of the base oil and that of the thickener. (In the chemical formulas (1) and (2), R1, R2, R3, R4, and R5 denote a methyl group or an ethyl group respectively. R1 and R2 are the same group or different groups. R3, R4, and R5 are the same group or different groups).

Abstract: A bearing arrangement 2 comprising an outer race 10, a shaft 4 arranged to rotate with respect to the outer race 10 thereby defining an axis of rotation 8 of the shaft 4. The shaft 4 and the outer race 10 are arranged to define a region of overlap between the shaft 4 and the outer race 10 along the axis of rotation. An inner race 12 is disposed between the outer race 10 and the shaft 4 in the region of overlap and coupled for rotation with the shaft 4, the inner race 12 and the shaft 4 defining an annular reservoir 40 between them for accommodating radial expansion of the shaft 4 or radial displacement of the shaft 4 with respect to the axis of rotation 8.

Abstract: A bearing is provided having a first race, a second race and one or more rolling elements. The bearing includes an alternate load path for extreme loads, and the alternate load path is formed between the first race and the second race. At least a portion of the extreme loads is diverted away from the rolling elements.

Abstract: A bearing and housing assembly for irregular shaped housings including a circular extension, retention and distortion relief features that can mitigate shape distortion of bearings.

Abstract: A rolling bearing having an outer ring, an inner ring and rolling bodies which roll on raceways of the rings. The raceway of the inner and/or outer ring and/or the surface of the rolling bodies has a burnishing layer, and the inner and/or the outer ring and/or the rolling bodies are formed of a steel which has a hardness of at least 58 HRC at least below the burnishing layer and which, at least below the burnishing layer, has: a nitrogen content at least in the marginal layer of 0.03-0.8%, the nitrogen being at least partially dissolved, a carbon content at least in the marginal layer of 0.1-1.2%, a nickel content of ?0.4%, a silicon content of 0.2-1.0%, a chromium content of ?1.0%, a sulfur content of ?0.008%, an oxygen content of ?15 ppm, and a titanium content of ?50 ppm.

Abstract: An electrically insulating bearing ring, in particular of a roller bearing, including a base body (2) and an electrically insulating layer (3) which is secured to the base body (2). The problem of providing an electrically insulating bearing ring, in particular of a roller bearing, with only a small layer thickness of the electrically insulating layer, is achieved according to the invention in that the electrically insulating layer (3) includes a polyamide, that the electrically insulating layer (3) has a thickness of approximately 20 microns to approximately 200 microns and that the electrically insulating layer (3) is securely arranged on the base body (2) by an intermediate layer (9).

Abstract: To prevent a problem due to gas produced from an adhesive and to improve the productivity of a rolling bearing apparatus. The present invention provides a method of manufacturing a rolling bearing apparatus, including fitting a first rolling bearing and a second rolling bearing to a first member each in a pressed state, pressing the inner races of the first and second rolling bearings in a direction in which they are closer to each other in the axial direction with a second member sandwiched between outer races of the first and second rolling bearings, and welding at least a portion of a peripheral portion of the inner race of the pressed second rolling bearing in the axial direction to the outer face of the first member through irradiation with laser light.

Abstract: A rolling bearing assembly includes an inner ring and an outer ring, and a plurality of rolling elements interposed between the inner ring and the outer ring. A sealing device having a base end fixed to the inner ring and also having a tip end held in contact with the outer ring to thereby seal a bearing space delimited between the inner ring and the outer ring is provided in the bearing assembly. The sealing device referred to above has a portion thereof that is in the form of a foreign matter intrusion preventing member made of a material capable of permitting lubricating oil to pass therethrough, but preventing an intrusion of a solid foreign matter.

Abstract: By incorporating a pump for sucking and discharging lubricating oil in a tank for storing the lubricating oil on an outside of a rolling bearing, for example, on a spacer for an outer ring in a housing for accommodating the rolling bearing and a nozzle in which an lubricating oil outlet communicating with a discharging port of the pump to supply the lubricating oil discharged from the pump to the rolling bearing is opened in an annular-shaped space between a fixed ring and a rolling ring in the rolling bearing, a cost is reduced by using a general-purpose rolling bearing, and at the same time, external devices and pipes for a lubrication are not required wholly or partially and problems of a noise made by compressed air are eliminated.

Abstract: The present invention provides a rolling bearing capable of suppressing the generation of retainer noise and abnormal vibration by specifying the circumferential width of axial grooves formed on the guide face of an outer ring guide retainer or an inner ring guide retainer. In a rolling bearing 1 according to the present invention, axial grooves 13 are formed on the outer circumferential face of the outer ring guide type retainer 10 thereof.

Abstract: A bearing assembly comprises a bearing support having at least one receptacle for a bearing. The bearing support also has at least one attachment segment for abutment and attachment of the bearing support onto an attachment portion of another component, such as a housing. At least one centering element protrudes in the axial direction and is disposed on the side of the attachment segment of the bearing support that faces towards the attachment portion of the other component. The at least one centering element is configured to at least partially enter into a corresponding opening in the attachment portion of the other component.

Abstract: An alloy, in particular for an anti-friction coating, includes elements which form a matrix and at least a soft phase and/or a hard phase, which soft phase elements and/or hard phase elements form a solid solution or a bond with the matrix element. The soft phase and/or hard phase is dispersed in the matrix and the solid solution or bond is formed only in the region of the phase boundary of the matrix with the soft phase and/or with the hard phase.

Abstract: A gas turbine engine comprising first and second rotor shafts and an intershaft rolling element bearing arranged between the shafts. The first rotor shaft has a stator stage and a rotor stage; the second rotor shaft has only a rotor stage and is arranged to contra-rotate relative to the first shaft. The intershaft bearing is arranged between the first and second shafts such that the relative speeds of the shafts minimise a cage speed of the intershaft bearing.

Abstract: A method and system for magnetically detecting thermal degradation of a component. A multiple of ferrous metal segments are attached to a component not within a lubrication circuit of a lubrication system with a thermally-affected bonding agent. The thermally-affected bonding agent is operable to detach at a threshold temperature at least one of the multiple of ferrous metal segments such that the at least one of the multiple of detached ferrous metal segments enters the lubrication circuit of the lubrication system. The at least one of the multiple of ferrous metal segments which detached are then detected within the lubrication system.

Abstract: The invention relates to a component (1) with an axis (A) consisting of at least a first layer (2) in the form of a tubular body and at least a second layer (3) which is arranged outside and/or inside of the tubular body (2) and which is firmly connected with the first layer (2). To make the element lightly and abrasive resistant simultaneously, the first layer (2) consists of a composite material, wherein the second layer (3) consists of a hard material. Furthermore, the invention relates to a method for the production of such an element.

Abstract: A device for axially fixing a rotatable part of a wheel bearing to a rotatable drive part of a drive shaft. The device provides a mounting auxiliary which enables inspection of the tooth position of a spur gearing. The device has a substantially cylindrical or ring-shaped attachment part and a locking element. Either the substantially cylindrical or ring-shaped attachment part is provided for attachment on the rotatable drive part, and the locking element is provided for locking to the rotatable wheel bearing part, or the substantially cylindrical or ring-shaped attachment part is provided for attachment to the rotatable wheel bearing part and the locking element is provided for locking to the rotatable drive part.

Abstract: A circular arc slide apparatus that achieves improved precision and a reduction in costs is provided. The circular arc slide apparatus comprises a lower plate, an upper plate, and a circular arc track provided between the lower plate and upper plate. Guide rail portions are provided in an upper surface of the lower plate and a lower surface of the upper plate, and circular arc curve-shaped guide grooves that constitute the circular arc track are provided in opposing planar surfaces of the guide rail portions. The guide groove cross-section describes a circular arc-shape, and a plurality of balls are rollably fitted between the opposing guide grooves in a preloading state. The lower plate and upper plate are integrally machined from a plate-like material and formed in a shape comprising the guide rail portions and guide grooves, and the inner surface of each guide groove is configured as a machined face produced by an end mill.

Abstract: The invention relates to an alloy, in particular for an anti-friction coating, comprising elements which form a matrix (2) and at least a soft phase (3) and/or a hard phase (5), which soft phase elements and/or hard phase elements form a solid solution or a bond with the matrix element. The soft phase (3) and/or hard phase (5) is dispersed in the matrix (2) and the solid solution or bond is formed only in the region of the phase boundary (4) of the matrix (2) with the soft phase (3) and/or with the hard phase (5).

Abstract: The present invention provides a member for a rolling bearing (1) which is capable of decreasing the amount of carbon dioxide generated from a polymeric member in discarding the rolling bearing, contributing to restraint or prevention of an increase in the concentration of the carbon dioxide in the atmosphere or a decrease of the concentration thereof in the atmosphere, and allows a continuous use temperature to be high and an endurance time to be long and a rolling bearing using the member. The member for the rolling bearing (1) is composed of a molding of a polymeric elastic body or a synthetic resin composition. The member is at least one member selected from among an inner ring (2), an outer ring (3), rolling elements (4), a retainer (5), and a sealing member (6). A raw material derived from a biomass is at least partially used for a producing raw material of a polymeric matrix composing the polymeric elastic body or the synthetic resin composition.

Abstract: The present invention relates to a bearing assembly, having at least one first bearing element and a second bearing element being movable relative to the first bearing element, wherein at least one of the bearing elements is made of ELTIMID.

Abstract: A bearing includes an inner bearing ring on which a raceway is formed. The ring includes at least a first component of light metal material and at least a second component of fully dense ceramic material, where the first component and the second component are separate entities joined together, and where the second component forms at least part of the raceway. The first component includes two lightweight metal parts interconnected by a screw thread which can be tightened to induce compressive pre-stress in the second component to compensate for low tensile strength of the ceramic material.

Abstract: An antifriction bearing (A) for accommodating rotation about an axis (X) comprises an inner race (2) having a raceway (12), an outer race (4) having a raceway (22), rolling elements (6) positioned between the inner and outer races (2, 4) and contacting the raceways (12, 22) of those races (2, 4) so that when relative rotation occurs between the races (2, 4) the rolling elements (6) roll along the raceways (12, 22), a cage (8) positioned between the inner and outer races (2, 4) and having pockets (40) in which the rolling elements (6) are received with the cage (8) being rotatable between the races (2, 4) as the rolling elements (6) roll along the raceways (12, 22), the outer race (4) having a power transmitting coil (50) and a receiver (60), the cage (8) having a power receiving coil (52), a sensing unit (D) for sensing a condition of the bearing (A), and a transmitter (54) for sending a signal indicative of the sensed condition of the bearing (A) to the receiver (60).

Abstract: Bearing cage, in particular for rolling bearings, with a first cage portion and a second cage portion. According to the invention, the first cage portion has at least one first engagement element, and the second cage portion has at least one second engagement element, and these engagement elements can be brought into engagement with one another by means of a relative movement of the first cage portion with respect to the second cage portion in such a way that an at least form-fit connection is established between the first cage portion and the second cage portion.

Abstract: Among other things, for wind-driven generation of electricity, a main shaft is rotated by a wind-driven rotor. A wheel having a diameter of at least 5 meters is mounted to rotate with the main shaft. An electrical generator is driven by the wheel. A yaw ring defines a plane around which the main shaft and rotor yaw. The wheel intersects the plane of the yaw ring.

Abstract: A cutting or sawing machine (1) comprising a machine body (3), at least one disc shaped, rotatable tool (16a, 16b), an elongated tool carrier (14) having the substantial shape of a flat bar having a front end and a rear end, two opposite broad sides and two opposite edge sides, said rear end being connected to the machine body. The tool carrier comprises at least two elongated side walls (24, 25), a first elongated side wall (24) on one broad side of the tool carrier, a second elongated side wall (25) on the opposite broad side, said first and second side walls being essentially parallel with each other, and the front part of either one of the side walls or of a possible central elongated member (25) between the first and second side walls is provided with a bearing hole (28a) intended to carry a bearing of sliding contact type or of rolling contact type, i.e.

Abstract: The invention describes a bearing element (1), comprising a protective layer (2), a bearing metal layer (3) applied over the protective layer (2) and a sliding layer (4) applied by sputtering over the bearing metal layer (3). A sliding paint layer (5) is applied onto the sliding layer (4).

Abstract: A precision machine tool, comprising a table which is suspended so that it is substantially a swivelable table; a driving element for driving a tood during machining of a part; and a device for orienting said table, said orienting device including at least three orienting elements, each including a plurality of rolling bodies which are brought successively into a contact with a surface of said table on which work pieces to be machined are located.

Abstract: A hitch assembly (1) commonly used between an accessory (such as a front end bucket) and a tractor or prime mover (such as a skid steer loader). The hitch assembly (1) includes a bearing arrangement, partly integral with one of two frame members (2, 3), which allows the two frame members (2, 3) to rotate relative to one another. The two frame members (2, 3) are attached to the tractor via adaptor (61) and the rear of the accessory (eg bucket 60). The bearing portion thus enables rotation of the accessory (60) about an axis substantially parallel to the longitudinal axis of the tractor. Automatic control in conjunction with laser type levelling systems or GPS contouring of sloped surfaces is also possible.

Abstract: In a fixture (1) for spatial positioning of a device (2), in particular a device for medical application, that is supported in a pivoting arrangement on a holding device (5) or the like by means of an arm (6), quick and easy alignment of the device (2) in relation to a person's treatment area should be guaranteed. This is achieved in that a ring-shaped holding body (11) is attached to the free end of the arm (6), that a spherical cup-shaped outer jacket surface (13) is provided on the device (2) with the surface enclosed wholly or in part by the holding body (11) and that the outer jacket surface (13) of the device (2) is held in the holding body (11) and can be pivoted relative to the holding body (11).

Abstract: An axle disconnect assembly comprises a shaft extending axially along a central axis, a universal joint including an outer drive member having a substantially annular axial flange extending axially outwardly from the outer drive member coaxially with the central axis so as to form an annular space between the axial flange and the shaft, and a directional roller clutch disposed in the annular space. The directional roller clutch is provided for selectively drivingly coupling the shaft to the outer drive member of the universal joint. The directional roller clutch includes a plurality of rolling elements provided between the outer and inner race members. The rolling elements of the directional roller clutch radially support the outer drive member of the universal joint for rotation about to the shaft.

Abstract: The invention relates to a wind turbine including at least two pitch controlled wind turbine blades. Each blade has pitch bearings including two or more bearing rings, and pitch controlling means for pitching the blades by means of the bearings. The blades are mounted on a hubs via the pitch bearings and the pitch bearings include separate flexibility enhancing means for controlling loads in the bearings.