Abstract: The present disclosure provides an improved cogwheel permitting enhanced meshing of cogwheels when operating perpendicularly. Exemplary embodiments introduce a multi-cogwheel design with specific dimensions and tooth profiles to permit perpendicular engagement of cogwheels whilst permitting translation of such cogwheels.

Abstract: A door drive for a motor vehicle door or motor vehicle flap, which is provided with an electromotive drive, a transmission downstream of the drive, and a force-transmission element. The force-transmission element is operatively connected to a leaf of the motor vehicle door or motor vehicle flap. An output element of the transmission and the force-transmission element are coupled by a toothing with compensation for play. According to the invention, the output element and/or the force-transmission element are not only designed to be moveable for play compensation, but can also be permanently fixed after the compensation for play.

Abstract: A drive transmitter includes a first member and a second member. The first member includes an opening through which a rotary shaft passes, a wall orthogonal to an axial direction of the first member, and a drive transmitting portion by which a driving force is transmitted. The second member has a rigidity greater than the first member and is configured to be fastened to the first member. A space is between the second member and the first member, with the first member and the second member being overlaid in a fastening direction of the second member, prior to fastening of the first member and the second member. At least a part of the wall of the first member defining the space with the second member is configured to shift toward the second member to reduce a diameter of at least a part of the opening at the fastening.

Abstract: The present invention relates to a dampened gear system for reducing gear rattle. More specifically, a dampened gear system includes a first gear vibrationally isolated from a second gear. At least one damper prevents rotational engagement between the first gear and second gear until a rotational load is applied. When a rotational load is applied, the at least one damper is compressed, resulting in at least one lug on the second gear contacting an engagement surface on the first gear, allowing the rotational load to be mechanically transferred from one gear to the other gear.

Abstract: An input device includes a fixed unit, a rotary member rotatably supported by the fixed unit, a rotation-detecting unit that detects a rotation angle of the rotary member, a brake-applying unit that applies a braking force to the rotary member, a torque-applying unit that applies a driving torque to the rotary member, and a control unit that controls the brake-applying unit and the torque-applying unit. The brake-applying unit includes magnetorheological fluid, a brake-applying coil that applies a magnetic field to the magnetorheological fluid, a shaft to which braking torque that changes with viscosity of the magnetorheological fluid is applied, and a transmission gear provided on the shaft and that is in mesh with a gear provided on the rotary member. The shaft is positioned on an outer side with respect to the rotary member in a radial direction of the rotary member.

Abstract: A gear wheel, in particular an idler gear, for reducing backlash in a gear train, includes a first wheel part and a second wheel part. The first wheel part has multiple teeth that are distributed over a periphery of the first wheel part. The first wheel part may rotate about a first axis (A). The second wheel part has multiple teeth that are distributed over a periphery of the second wheel part. The second wheel part may rotate about a second axis (B) that is arranged parallel to and offset with respect to the first axis.

Abstract: An Actuating device for a bicycle is provided. The actuating device may include a static element which is positionally fixed in relation to a bicycle frame, a movable element which is movable in relation to the static element, an electromechanical drive which provides drive force for a movement of the movable element. The electromechanical drive has a motor and a gearing driven by the motor. The gearing may include a first gearing wheel and a second gearing wheel which is in engagement with the first gearing wheel.

Abstract: A throttle valve having: a valve body; an intake duct obtained in the valve body; a throttle plate arranged in the intake duct; a shaft mounted so as to rotate, supporting the throttle plate; an electric motor; a gear transmission, which couples the electric motor to the shaft and has an end gear which is integral with the shaft; a return spring, which is designed to rotate the throttle plate towards a closing position; a striking element, which is obtained in the valve body and establishes an intermediate position of partial opening; and a countering spring, mounted on the end gear, which is designed to rotate the throttle plate towards the intermediate position and has one end which is designed to rest against the striking element during the rotation of the end gear.

Abstract: A variety of scissors gear assemblies are disclosed that utilize integral parts or common tools to align teeth of the scissors gear assembly. Methods of use are also disclosed.

Abstract: A drive transmission device includes a drive source, a first drive transmitter and a second drive transmitter. The drive source generates a drive force. The second drive transmitter is coaxially arranged with the first drive transmitter and includes a material different from a material of the first drive transmitter. The drive force of the drive source is transmitted between the first drive transmitter and the second drive transmitter. The first drive transmitter is fastened to the second drive transmitter.

Abstract: A scissor gear oil supplying structure includes: a scissor gear that is provided on an outer the circumference of a tip end portion of a shaft; a first oil passage; a second oil passage that extends from the first oil passage in the radial direction; an extension hole that is opened at the front end surface of the shaft; a female screw that is formed in the first oil passage on the rear side of the second oil passage; a rotating member; and a bolt that is inserted into the extension hole and the first oil passage to fasten the rotating member to the shaft and is screwed into the female screw, in which lubricating oil is guided from the first oil passage to the second oil passage along a gap between thread grooves of the female screw and thread ridges of the bolt.

Abstract: A bearing assembly comprising a rotating shaft, a rolling bearing and a scissors gear. The bearing assembly further comprises an axial retaining system for the scissors gear onto the rolling bearing. A shield is arranged in a groove of an outer massive ring of the rolling bearing.

Abstract: A robot arm includes a first holder and a second holder. The first holder includes a first base portion and a first distal portion. The first distal portion has a first distal thickness smaller than a thickness of the first base portion. The second holder includes a second base and a second distal portion. The second distal portion has a second distal thickness smaller than a thickness of the second base portion. A first rotator is supported by the first distal portion and the second distal portion. A second rotator is supported by the first rotator. A first bevel gear is provided in the first distal portion. Another first bevel gear is provided in the second distal portion. A second bevel gear engages with the first bevel gear and the another first bevel gear.

Abstract: The invention relates to a device (4) for positioning meshing teeth (3, 8, 9) of a gear drive without any play, comprising a gear assembly (5), which gear assembly (5) comprises a main gear (6) having first teeth (8) and a gear (7) that is rotatable relative thereto in the circumferential direction having second teeth (9), and the main gear (6) comprises a hub part (10) on which the rotatable gear (7) is disposed, and a tolerance compensating element (12) comprising a shaft part (13) and a compensating part (14) is disposed radially underneath the main gear (6), and the compensating part (14) is connected to the shaft part (13) and to the hub part (10) of the main gear (6) so that the main gear (6) is connected exclusively via the compensating part (14) to the shaft part (13), and the compensating part (14) is made at least partially from a rubber elastic material.

Abstract: A motor coupling device for connecting a drivetrain of a hybrid vehicle to a motor and transferring a driving torque of the motor to the drivetrain, the motor coupling device comprising: a coupling plate connected to a rotation shaft of the motor and engaging with a connecting plate of the drivetrain; and a first backlash compensation unit installed at one surface of the coupling plate, interfering with the connecting plate, and compensating for backlash when a motor reverse torque is generated.

Abstract: The invention relates to a gear assembly (12) comprising a fixed gear (13) having a first radial toothing (16) and an idler (14) having a second radial toothing (17), the first radial toothing (16) being disposed at least approximately at the same radial height as the second radial toothing (17), and the fixed gear (13) further comprises a first axial end face (18) and the idler (14) comprises a second axial end face (19), and the fixed gear (13) is connected to the idler (14) by means of at least one elastic connecting element (21), for which purpose the elastic connecting element (21) is connected on the one hand to the first axial end face (18) of the fixed gear (13) and on the other hand to the second axial end face (19) of the idler (14).

Abstract: A bicycle sprocket includes a sprocket body, and a plurality of sprocket teeth. At least one of the sprocket teeth includes a first layered member, a second layered member and a third layered member. The first layered member has a first axial surface and a second axial surface. The second layered member is attached to the first axial surface such that the first and second layered members overlap each other in an axial direction as viewed parallel to a rotational axis of the sprocket body. The third layered member is attached to the second axial surface such that the first and third layered members overlap each other in the axial direction as viewed parallel to the rotational axis of the sprocket body. The first layered member has a specific gravity that is less than those of the second layered member and the third layered member.

Abstract: In a wobble removal shaft coupling device including a wobble removal gear having an internal gear with a first central axial line and an external gear meshing with the wobble removal gear and having a second central axial line. The first and second central axial lines are in parallel with and offset from each other, and the external gear teeth are identical in number to the internal gear teeth of the wobble removal gear. At least one of the two sets of the gear teeth are resiliently deformable in a circumferential and/or radial direction so as to allow the two gears to be meshing with each other while permitting an eccentric wobbling movement of the external gear relative to the internal gear without requiring a play or a sliding engagement. The wobble removal shaft coupling device can be incorporated in a hypocycloid reduction gear device.

Abstract: A split ring planetary drive of an electric phaser includes at least one planet gear adjuster and at least one load generator. The load generator biases the planet gear adjuster, such that at a low rotational speed, the planet gear adjuster applies a force on the planet gear to take up the backlash between the planet gear and the ring gears. As the rotational speed increases, the inertia of a mass of the planet gear adjuster generates an increasing force opposing the force of the load generator, causing the planet gear adjuster to move at least one planet gear to a position where the at least one planet gear no longer takes up the backlash. In some embodiments, the planet gear adjuster includes an eccentric pin and an extension arm. In other embodiments, the planet gear adjuster includes a pivot support for a pair of inner and outer planet gears.

Abstract: A bicycle sprocket includes a sprocket body, and a plurality of sprocket teeth. At least one of the sprocket teeth includes a first layered member, a second layered member and a third layered member. The first layered member has a first axial surface and a second axial surface. The second layered member is attached to the first axial surface such that the first and second layered members overlap each other in an axial direction as viewed parallel to a rotational axis of the sprocket body. The third layered member is attached to the second axial surface such that the first and third layered members overlap each other in the axial direction as viewed parallel to the rotational axis of the sprocket body. The first layered member has a specific gravity that is less than those of the second layered member and the third layered member.

Abstract: A gear arrangement has a split spur gear toothing, including a main gear and a gear rotatable relative to it in the circumferential direction, and the main gear has a hub on which the rotatable gear is mounted, and a spring element is disposed between the main gear and the rotatable gear and biases the rotatable gear in the circumferential direction towards the main gear, and a first spur gear toothing part is provided on the main gear and a second spur gear toothing part is provided on the rotatable gear. The rotatable gear is guided by at least one at least approximately annular guide web in the region of the spur gear toothing.

Abstract: The invention relates to a gear system (1) comprising a main gear (2) and a gear (4) rotatable relative thereto in circumferential direction (3), comprising spring elements (8), by means of which the rotatable gear (4) is pretensioned in circumferential direction (3) against the main gear (2), wherein the spring elements (8) are connected on the one hand to the main gear (2) and on the other hand to the rotatable gear (4), and wherein the spring elements (8) each have a longitudinal middle axis (19) running obliquely relative to an axial end face (18) of the rotatable gear (4).

Abstract: The invention relates to a gear arrangement (1), comprising a main gear (2) and a gear (4) that can be rotated relative to the main gear in the circumferential direction (3), wherein the main gear (2) or the rotatable gear (4) has at least one supporting web (12) that protrudes in the axial direction (7) and the rotatable gear (4) or the main gear (2) has at least one opening (16), in which the supporting web (12) is at least partially accommodated, wherein the opening (16) has a dimension in the circumferential direction (3) that is greater than the dimension of the supporting web (12) in the same direction, and comprising at least one spring element (10), which acts in the circumferential direction (3) of the main gear (2) and which is arranged on a lateral surface (13) of the supporting web (12) or on a lateral surface (17) of the opening (16) and at least partially within the opening (16). The spring element (10) is connected to the supporting web (12) or the lateral surface (17) of the opening (16).

Abstract: Provided is a scissors gear device having a structure which is simplified so as to reduce its overall size and thereby expand the range of application and simplify its assembly process. A scissors gear device 100 includes a main gear 101 and a sub-gear 104. The main gear 101 has three curved-surface protrusions 102 formed at a peripheral edge of one side surface thereof. The curved-surface protrusions 102 are arranged in the circumferential direction and each have an arcuate shape. The sub-gear 104 has three sloped surfaces 105 formed at a peripheral edge of its side surface facing the main gear 101. The sloped surfaces 105 are arranged in the circumferential direction. The sloped surfaces 105 are provided at positions corresponding to the curved-surface protrusions 102 formed on the side surface of the main gear 101. Each sloped surface 105 is a flat surface which extends in the circumferential direction and slopes toward the interior of the sub-gear 104 at a predetermined angle ?.

Abstract: A gear assembly including a main gear including a first hub, a first gear ring positioned about the first hub, and a first helically splined region. The gear assembly further includes a sub-gear co-axially disposed relative to the main gear with a resilient member disposed therebetween. The sub-gear including a second hub, a second gear ring positioned about the second hub, and a second helically splined region complementary to the first helically splined region.

Abstract: An instrumental unit includes: a step motor; a gear including: a gear body rotated by torque of the step motor, the gear body including a first surface formed with a recess and a second surface opposite to the first surface; and a rotary shaft projecting from the first and second surfaces; a controlling spring accommodated in the recess, a center of the controlling spring through which the rotary shaft projects, the controlling spring having lengths in long and short axis directions orthogonal to each other and having a line-symmetric shape with respect to each of the long and short axis directions; and a case accommodating the step motor, the gear body and the controlling spring, an inner surface of the case including: a first portion supporting the second surface; and a second portion pressing the controlling spring in the recess of the first surface.

Abstract: The present disclosure relates generally to an anti-backlash component. In one embodiment, the anti-backlash component includes a housing, the housing comprising a first threaded opening and a second opening, a bolt coupled to the housing through the first threaded opening and the second opening, the bolt comprising a spherical end, a nut coupled to the bolt and an exterior side of the second opening of the housing and a socket coupled to the spherical end of the bolt.

Abstract: Backlash take-up timepiece wheel (10), for meshing with a second toothing (21) formed of second teeth (23) of given width (24) arranged consecutively with a second constant pitch (P2) on a second pitch diameter (22) of an opposing mobile component. This backlash take-up wheel (10) comprises, arranged to mesh with this second toothing (21), a first toothing (11) on a first pitch circle (12) comprising a series of identical pairs (2) of teeth arranged consecutively with a first constant pitch (P1) on the first pitch circle (12). Each such pair (2) comprises, on either side of a radial axis (3), a first flexible tooth (4) and a second tooth (5). Each second tooth (5) is a flexible tooth, and the distances (91, 92) measured on the first pitch circle (12) between a successive first tooth (4) and second tooth (5) are different in pairs.

Abstract: A compliant gear assembly includes a hub subassembly including a first hub component defining a first axis and a second hub component movable relative to the first hub component in a controlled direction perpendicular to the first axis. A gear ring, which is rotatably mounted on the hub subassembly and defines a gear ring axis of rotation, is coupled to move with the second hub component between a biased position in which the gear ring axis of rotation is coaxial with the first axis and a translated intermediate stop position in which the gear ring axis of rotation is parallel to but not coaxial with the first axis. A spring component is coupled between the first and second hub components, biases the second hub component toward the biased position, and provides a variable spring force that increases as the second hub component is moved toward the translated intermediate stop position.

Abstract: A backlash eliminating device for helical gears is provided for a gear transmission system which includes a transmission shaft, two helical gears and a match gear. A sleeve mounted on the transmission shaft has an outer wall, an inner wall and at least two sections of spiral grooves penetrating through the outer wall and the inner wall. The sleeve includes a transmission part and two extremity parts. The transmission part is disposed between the spiral grooves, and is fixedly connected to the transmission shaft. The extremity parts are disposed outside of the spiral grooves. The helical gears are fixedly connected to the two extremity parts. The sleeve having the spiral grooves provides a preload spring force along an axial direction of the transmission shaft, so that the two helical gears are tightly engaged with the match gear.

Abstract: A device for pressing a rack onto a pinion engaging the rack, more particularly for a steering system of a motor vehicle, comprises a pressure piece which is slidably guided in a housing and which is loaded in the direction of the rack, and an adjusting device. Devices made of metal are known from the prior art, which, however, generate excessive noise emissions during operation. Therefore, the pressure piece is made of plastic and the adjusting device is made of metal and/or plastic.

Abstract: A transmission gear assembly, including: at least two gearwheels fitted with teeth on their periphery and connected together. One of the at least two gearwheels is a main gearwheel. Another of the at least two gearwheels is an auxiliary gearwheel. The teeth of the auxiliary gearwheel are formed resilient in a radial direction.

Abstract: In a molded plastic part 1 including a body 2 constituting a design surface 2a and a reinforcing structure 3 projectingly provided on a design back surface 2b of the body 2, the body 2 and the reinforcing structure 3 being integrally molded by injection molding, the reinforcing structure 3 is formed by a combined body of a plurality of transverse ribs 7a, 7b, 7c and 7d which are arranged at appropriate intervals in the resin flow direction at the time of injection molding in the direction intersecting with the resin flow and longitudinal ribs 6p and 6q which extend at right angles to the transverse ribs and connect the transverse ribs to each other. The transverse ribs are connected to the design back surface 2b, and a gate 8 for injection molding is set on one of the transverse ribs. The longitudinal ribs are disposed so as to be separated from the design back surface 2b.

Abstract: The invention relates to a gear system (1) comprising a main gear (2) and a gear (4) rotatable relative thereto in circumferential direction (3), comprising spring elements (8), by means of which the rotatable gear (4) is pretensioned in circumferential direction (3) against the main gear (2), wherein the spring elements (8) are connected on the one hand to the main gear (2) and on the other hand to the rotatable gear (4), and wherein the spring elements (8) each have a longitudinal middle axis (19) running obliquely relative to an axial end face (18) of the rotatable gear (4).

Abstract: A gearbox assembly for all electric power steering apparatus comprises an input shaft which carries a worm gear and is supported relative to the housing at one end by a first bearing assembly and at the other by a second bearing assembly, an output shaft which carries a wheel gear which is fixed relative to a housing and which meshes with a worm gear on the input shaft, and a spring assembly which acts between the housing and the first bearing assembly, and the spring assembly applying a biasing force onto the second bearing in a first direction away from the neutral position so as to ensure that the worm and wheel are fully engaged.

Abstract: A component pairing comprises a first component with a first component toothing and comprises a second component with a second component toothing which is in engagement with the first component toothing in order to be able to transmit a drive force in a drive direction via the component toothings. The first component is also assigned a first anti-rattle toothing. An anti-rattle component is fastened to the second component, which anti-rattle component has a second anti-rattle toothing which is in engagement with the first anti-rattle toothing. The anti-rattle component is mounted so as to be displaceable relative to the second component in the drive direction. The second component and the anti-rattle component are assigned in each case one friction section. The friction sections are in frictional engagement with one another.

Abstract: A sprocket unit comprising: a damper mounted on the first shaft with a first face defining a recess and a second face defining chambers for receiving spring loaded weights; a sprocket mounted to the first shaft with a hub defining an aperture and a slot; a front end plate mounted on the shaft with a hub defining an aperture aligned with the aperture of the sprocket; and a spring received within the aperture of the sprocket, the aperture of the front end plate, and the recess of the damper. When the first shaft rotates and firing frequency of the engine coincides with a resonant frequency of the first shaft, the spring loaded weights slide in the chambers of the damper, dampening out the resonant frequency in the first shaft and when the sprocket rotates the spring compresses and extends, reducing torsional load of the first shaft on the second shaft.

Abstract: A transmission installed between a drive machine and a unit to be driven, the transmission being fitted with a drive shaft and a driven shaft, wherein the drive shaft is in driving connection with the driven shaft for speed/torque conversion, and wherein the driven shaft is supported in the transmission using at least one primary axial bearing. The transmission including a starting unit absorbing axial loads of the driven shaft, wherein the starting unit comprises a secondary axial bearing, and wherein the starting unit is formed in such a way that when the unit is actuated, the axial loads of the driven shaft are substantially completely absorbed by the secondary axial bearing.

Abstract: A divided toothed wheel having two toothed wheel halves which are tensioned in relation to each other. The first toothed wheel half includes a hollow cylindrical collar with a groove, to which the second toothed wheel half is secured in a form-fitting engagement by a securing element inserted into the groove. The divided tooth wheel takes up a minimum amount of space from the axial direction and has two halves which are permanently connected together. The second toothed wheel half has a radially extending recess and the securing element is designed as an elastically shapeable ring which is arranged in a receiving chamber defined by the groove and the recess and the two toothed wheel halves are permanently joined together.

Abstract: Described in this application is a zero-backlash preload gear assembly. The assembly is specifically described for use with a positioning system in order to significantly reduce or eliminate mechanical error and improve tolerances. Furthermore, the assembly allows for infinite positioning of a work surface in order to facilitate improved efficiency of an automated system.

Abstract: The present gear mechanism includes a base body member, a first gear supported on the base body member so as to rotate about a first rotational axis, a second gear capable of being meshed with the first gear, a support member supporting the second gear so as to rotate about a second rotational axis and placed on the base body member so as to be movable in approaching and leaving directions respectively toward and away from the first rotational axis, and a retaining member engaged in a threaded hole formed in the base body member and capable of being turned so as to move in the approaching and leaving directions, and directly or indirectly engaged with the support member to restrain the support member from moving in the leaving direction away from the first rotational axis.

Abstract: A backlash adjustment mechanism includes a first cylindrical gear fixed in an axial position, a second cylindrical gear moveable along the axis and meshed with the first cylindrical gear, and an elastic member biasing the second cylindrical gear towards the first cylindrical gear. The addendum modification coefficients in the first and second cylindrical gears are linearly changed along their axes, respectively, an end of the first cylindrical gear with higher addendum modification coefficient meshes with an end of the second cylindrical gear with correspondingly lower addendum modification coefficient, and an end of the first cylindrical gear with lower addendum modification coefficient meshes with an end of the second cylindrical gear with correspondingly higher addendum modification coefficient.

Abstract: Certain embodiments of a system for reducing backlash include a mechanical input, a mechanical output, and first and second mechanical couplers each connected to the mechanical input and the mechanical output. An exemplary system includes an elastic element connected in series between the first mechanical coupler and the mechanical output to bias the first mechanical coupler in a first direction and an elastic element connected in series between the second mechanical coupler and the mechanical output to bias the second mechanical coupler in a second direction, where the second direction is opposite from the first direction.

Abstract: The invention relates to a gear arrangement (1), comprising a main gear (2) and a gear (4) that can be rotated relative to the main gear in the circumferential direction (3), wherein the main gear (2) or the rotatable gear (4) has at least one supporting web (12) that protrudes in the axial direction (7) and the rotatable gear (4) or the main gear (2) has at least one opening (16), in which the supporting web (12) is at least partially accommodated, wherein the opening (16) has a dimension in the circumferential direction (3) that is greater than the dimension of the supporting web (12) in the same direction, and comprising at least one spring element (10), which acts in the circumferential direction (3) of the main gear (2) and which is arranged on a lateral surface (13) of the supporting web (12) or on a lateral surface (17) of the opening (16) and at least partially within the opening (16). The spring element (10) is connected to the supporting web (12) or the lateral surface (17) of the opening (16).

Abstract: A scissors gear may include a main gear and a sub-gear co-axially combined by a scissors spring therebetween to integrally rotate, a first oil supply hole formed in the main gear or the sub-gear to supply oil from the outside, an oil groove formed in the sub-gear or the main gear to receive the oil by being selectively communicated with the first oil supply hole, and a check valve that is disposed in the main gear or the sub-gear to open/close the oil groove.

Abstract: To enhance durability of a gear transmission mechanism by eliminating play in a gear engagement due to the backlash between the gears (gear clearance) of the gear transmission mechanism in a variable pitch mechanism of blades or a nacelle turning mechanism and further to reduce damages to a gear tooth surface caused by slide of the tooth surface or impact thereon due to slight vibration, the gear transmission mechanism is constructed such that a first pinion gear 20a and a second pinion gear 20b are provided to mesh with a gear wheel 18 respectively and rotated by a first drive motor 32a and a second drive motor 32b respectively, and a controller 36 controls so as to eliminate play in the engagement of the internal gear and the pinion gear due to backlash between the internal gear 18 and the first pinion gear 20a, thereby avoiding generation of a slide and impact force on the gear transmission mechanism even when the external force or the wind acts on the blade 16.

Abstract: The invention relates to a transmission device comprising a first gear wheel and a second gear wheel that is rotatably coupled thereto, wherein a damping element acting in the circumferential direction is provided axially between the gear wheels. According to the invention it is provided that the damping element can be tensioned by the gear wheels during the operation of the transmission device.

Abstract: A gear including a gear shaft, and a gear wheel made of a resin material, the gear wheel being fixed to the gear shaft by molding. The gear having a plurality of concave portions and convex portions that repeat in a circumferential direction. The plurality of concave and convex portions are arranged such that they extend in the axial direction of the gear shaft, and arranged such that the convex portions of one concave and convex group are adjacent to the concave portions of the other concave and convex group. Due to the relative displacement of the concave portions and the convex portions, stepped portions are formed at a boundary between the concave and convex groups in the circumferential direction of the gear shaft.

Abstract: To enhance durability of a gear transmission mechanism by eliminating play in a gear engagement due to the backlash between the gears (gear clearance) of the gear transmission mechanism in a variable pitch mechanism of blades or a nacelle turning mechanism and further to reduce damages to a gear tooth surface caused by slide of the tooth surface or impact thereon due to slight vibration, the gear transmission mechanism is constructed such that a first pinion gear 20a and a second pinion gear 20b are provided to mesh with a gear wheel 18 respectively and rotated by a first drive motor 32a and a second drive motor 32b respectively, and a controller 36 controls so as to eliminate play in the engagement of the internal gear and the pinion gear due to backlash between the internal gear 18 and the first pinion gear 20a, thereby avoiding generation of a slide and impact force on the gear transmission mechanism even when the external force or the wind acts on the blade 16.

Abstract: A scissor gear assembly may include first and second gears, a friction plate, and a biasing member. The first gear may have a first number (n) of gear teeth extending from a perimeter thereof. The second gear may have a second number (m) of gear teeth extending from a perimeter thereof and may be concentrically mounted relative to the first gear and rotatable relative to the first gear. The second number (m) of gear teeth may be greater than the first number (n) of gear teeth. The friction plate may be rotationally fixed relative to the first gear. The biasing member may have a first end axially fixed relative to the first gear and a second end axially biasing the second gear and the friction plate into engagement with one another.