Abstract: A compliant gear assembly for a gear train of an internal combustion engine includes a hub subassembly having a first hub component and a second hub component. The first hub component defines a first axis, and the compliant gear assembly includes a gear ring rotatable relative to the hub subassembly and defining a gear ring axis of rotation. The second hub component is movable relative to the first hub component in a direction normal to the first axis between a first stop position at which the gear ring axis of rotation is co-linear with the first axis and a second stop position at which the gear ring axis of rotation is parallel to but not co-linear with the first axis. A compliance mechanism is coupled between the first hub component and the second hub component and biases the second hub component toward the first stop position.

Abstract: To render a gear arrangement for a transmission as quiet as possible but nevertheless able to handle heavy loads, a first gear made of a first material and a second gear made of a second material sit loosely next to one another on a common shaft. The elasticity of the first gear, preferably made of plastic, is chosen to be greater than that of the second gear, preferably made of metal, while the strength of the second gear is chosen to be greater than that of the first gear. Because the second gear preferably exhibits a slightly smaller toothing than the first gear, only the first gear comes into engagement with another gear in normal operation. As the load increases, the first gear made of plastic yields in the elastic range so that now the second gear made of metal also comes into engagement in order to accept the forces occurring and thereby protect the first gear against overloading and fracture. The gear arrangement is generally suitable for transmissions, for example for planetary transmissions.

Abstract: A lead screw nut support arrangement includes a wall having a width and a through hole that passes through the wall. A support bushing passes through the through hole in the axial direction, leaving an amount of play, and having a length greater than the thickness of the wall. The support bushing is supported in the through hole movably in the axial direction. A lead screw nut is also included whose end face adjoins a first end face of the support bushing on the inner side of the wall. The support arrangement also includes a mount that braces a second end face of the support bushing against the lead screw nut such that the lead screw nut is elastically loaded in the direction away from the wall.

Abstract: A power steering device includes a first gear provided on the first shaft, the first gear having a centerline axis, and a second gear operatively connected to the first gear. The second gear includes a rotational axis that is maintained substantially coplanar with the centerline axis. The power steering device further includes a compliant member operatively connected with the second gear. The compliant member allows rotational compliance of the second gear while avoiding axial and radial compliance.

Abstract: Disclosed herein is a gear for eliminating backlash. The gear includes a rotating shaft having a hollow portion. A first gear is connected to an end of the rotating shaft to be rotated in sync with the rotating shaft, and has on a central portion thereof a connecting protrusion which protrudes forwards. A hole is formed so as to communicate with the hollow portion of the rotating shaft, and a pair of first mounting holes is formed in the first gear along an arc thereof. A second gear is rotatably connected to the connecting protrusion of the first gear and has the same teeth as teeth of the first gear. A cylinder is provided in each of the first mounting holes and connected at both ends thereof to the first gear and the second gear, thus rotating the second gear in one direction. A locking cap is provided on an end of the connecting protrusion of the first gear to prevent the second gear from being eliminated from the first gear.

Abstract: A toothed mobile part (1) for play take-up in a gear, particularly in horology, having certain (7) of its teeth fixed and entirely rigid, and other (8) of its teeth each intercalated between two rigid teeth (7) and elastically deformable, is characterised in that said elastically deformable teeth (8) consist of spring blades each comprising a gear flank (9), and in that for each spring blade (8) the distance (12) measured on the pitch circle (13) of the mobile part (1), between the gear flank (9) of the spring blade (8) and the corresponding flank (10) of the one among the two adjacent rigid teeth (7) facing the gear flank (9) is smaller than the distance (14), again measured on the pitch circle (13) of mobile part (1), between the gear flank (9) and the corresponding flank (10) of the other adjacent rigid tooth (7).

Abstract: A drive system for rotating an assembly, such as an external vehicle mirror housing, about an axis is provided with a drive housing containing a worm drive assembly coupled to an axis gear mounted about the axis. The worm drive assembly is rotated by an electric motor. The axis gear is stationary with respect to the axis, such that rotation of the worm drive assembly will cause it to travel about the axis gear. Such movement of the worm drive assembly will cause the drive housing and the associated external vehicle mirror housing to rotate about the axis. Thrust transmitted to the worm drive assembly is transmitted to a central portion of the drive housing by a shaft retainer associated with the worm drive assembly. Play between the axis gear and the worm drive assembly is prevented by eliminating separation between adjacent components of the worm drive assembly.

Abstract: A resin gear has a plurality of teeth on an outer periphery thereof. One surface of each tooth has a tooth plane which meshes with another gear. The tooth thickness is substantially uniform from a tooth tip to a tooth root. A reinforcing rib is provided on the surface of each tooth on the opposite side from the tooth plane.

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.

Abstract: A swing mechanism for a construction machine is provided with a center frame 3 having a pinion insertion hole 3c, an inner race having an internal gear and mounted on a side of an undercarriage, an outer race 1b rotatably arranged surrounding the inner race and provided with the center frame secured thereon by bolts 8a, a pinion maintained in meshing engagement with the internal gear of the inner race, and a pinion drive device. A pin fit-in hole 3d arranged in the center frame 3 such that a knock pin 6 fixed on the outer race 1b is fitted in the pin fit-in hole to position the center frame 3. To arrange the pin fit-in hole 3d in the center frame 3, a pin fit-in hole portion 20 through which the pin fit-in hole 3d is formed is locally arranged such that the pin fit-in hole portion 20 extends toward the pinion insertion hole 3c to have a center of the pin fit-in hole 3d located on a center connection line S.

Abstract: A plastic gear having a gear peripheral portion including a tooth portion is constituted by a plastic material, and a gear inner circumferential member with an annular shape or a disk shape is provided at the inner circumferential side of the gear peripheral portion. The gear peripheral portion includes an inner core and a surface layer member, the inner core being covered with the surface layer member and made of plastic with high elastic modulus and high strength, and the surface layer member being made of plastic with relatively low elastic modulus. The inner core is revolvably fitted around the gear inner circumferential member so as to revolve around the gear revolving axis, and an engaging portion is provided at an interface of the surface layer member and the gear inner circumferential member for preventing relative revolution around the gear revolving axis.

Abstract: A track system (18) of the type used to adjust the position a supported element such as vehicular seat (12) includes a pair of base rails (20) that slidably interact with a respective pair of driven rails (22). A transverse rail (24) is attached to each of the driven rails (22) so that the driven rails (22) slide together as a unit. A motor (34) is supported on the transverse rail (24) and includes a pair of drive shafts (36) emanating from either end. The drive shafts (36) carry on their distal ends' respective worm gears (38) which are contained within a transmission assembly (26). The worm gears (38) mesh with external teeth on respective drive nuts (54) which interact with a lead screw (28) that can be oriented to either remain stationary relative to the base rails (20) or can be rotatably fixed within the driven rails (22). The drive nut (54) is prevented from causing objectionable noise and premature wear in operation by the inclusion of one or two compressible washers (66).

Abstract: A steering-wheel arrangement is disclosed which comprises a steering-wheel having a first gear element. A second gear element is provided which is mounted on a steering column. The first and second gear elements inter-engage one another and the arrangement is further provided with an anti-backlash gear which is mounted on one of the gear elements. The anti-backlash gear has teeth configures to as to align substantially with the teeth of the gear element upon which it is mounted, and the anti-backlash gear is biased relative to the gear element upon which it is mounted towards a position in which the teeth of the anti-backlash gear become displaced from the corresponding teeth of the gear element. This gear arrangement has been found to provide improved “feel” for a person driving a motor vehicle.

Abstract: A compliant gear assembly includes a gear ring positioned about a hub and configured to translate responsive to a torque on the gear assembly, and biased toward co-axial alignment with the hub via at least one actuator. A method of managing loads on an idler gear in the gear train is still further provided including translating the gear ring responsive to the torque on the idler gear. A work machine includes an engine having a housing and a geartrain mounted thereon, the geartrain including a crank gear, a cam gear and a compliant idler gear assembly.

Abstract: A planetary gear train having planetary gears (8) which are rotatably mounted on a planet carrier (18) and are in toothed contact with an internally toothed ring gear (14) and a sun gear (4). For a simplified, process-safe and inexpensive backlash of the planetary gears (8) without axial displacement of the sun gear (4), the ring gear (14) and the planetary gears (8) are conically designed so that planetary gear axles (16) are retained in the planetary gear carrier (18) at an inclined angle (a) and that the planetary gears (8) are axially movably disposed upon and coordinated with the planetary gear axles (16) and the position of the planetary gears (8) can be adjusted within the planetary train by adjusting mechanisms for adjusting a backlash.

Abstract: A device to prevent wobbling of cog wheels (3) arranged on a main shaft (6) in a transmission train with two countershafts (1, 2), which has at the minimum, a disk (7) for one of the cog wheels that is connected with the respective cog wheel (3) and/or is supported on the face side of a gearing (8) of the countershafts (1, 2) or on intermediate shafts (12) for the reverse gears, whereby the respective cog wheel (3) is pushed by the spring action against the disk (7).

Abstract: An optical module includes a first optics group, a second optics group, and an image sensor, wherein the first optics group and second optics group are configured to provide an image having a focus and a magnification to the image sensor. In some embodiments of the present invention, a first optics assembly includes a first optics group coupled to a threaded portion of a first lead screw so that rotation of the first lead screw results in translation of the first optics group along an axis of the first lead screw, a first actuator for rotating the first lead screw; and a first sensing target configured to permit detection of rotation of the first lead screw.

Abstract: A positioning device without backlash includes a table and at least one gear operatively associated with the table. At least one worm gear is connected to the gear and the gear is driven in a desired direction with a primary motor and a synchronized slave motor. The synchronized slave motor is then reversible to remove the backlash in the positioning device thereby permitting an actual position to correspond with a dialed-in position.

Abstract: The present invention relates to a sliding screw arrangement (14) for transformation of the rotational movement of a threaded axis (13) into a linear movement of the sliding screw providing minimized tolerances for variations of the screw position in both radial and axial direction and providing minimized friction when moving the sliding screw arrangement along said threaded axis. The screw arrangement consists preferably of two parts (20, 30) and comprises a first resilient part, e.g. a spring (143), to compensate tolerances axial direction and a second resilient part, e.g. a resilient tongue (25), and tracks (28) to compensate tolerances in radial direction. The screw hollowness through which the threaded axis is guided is at its inside is equipped with semi-spheres (21,31) that follow the turn of a thread of the axis.

Abstract: A power tool includes an impact damping mechanism for damping an impact in a direction of rotation of a speed reduction mechanism portion 8.

Abstract: A camera system incorporating a seamless lens-drive switching mechanism includes a lens drive ring, a manual operation ring, a motor, a first one-way rotational transfer mechanism preventing the manual operation ring and the lens drive ring from being connected with each other in a first neutral state, and maintains the first neutral state even if the lens drive ring is rotated by the motor; a second one-way rotational transfer mechanism which prevents the motor and the lens drive ring connecting with each other in a second neutral state, connects the motor with the lens drive ring when the motor rotates from the second neutral state, and maintains the second neutral state even if the lens drive ring is rotated by the manual operation ring; and a controller which stops and reverses the motor to bring the second one-way rotational transfer mechanism into the second neutral state.

Abstract: An encoder shaft assembly includes a drive shaft having a drive gear, and an array of encoder units each having an encoder shaft and anti-backlash gears which engage the drive gear.

Abstract: A plastic molded gear capable of reducing teeth knocking noises due to backlash during engagement. A protruding portion 5 for eliminating backlash is formed so as to protrude from both end portions in facewidth directions on one tooth flank 6 of each tooth 2, and the protruding portion 5 is not formed on the other tooth flank 12 of the tooth 2. If the protruding portion 5 is elastically deformed so as to absorb backlash, the protruding portion 5 has the same plane as that of the one tooth flank 6, and the other tooth flank 12 of the tooth 2 serves as a main power transmission surface. With this construction, the protruding portion 5 elastically contacts the tooth flank of a companion gear engaged with the plastic molded gear, so that the elastic deformation of the protruding portion 5 absorbs rotational energy of the companion gear during intermittent rotation.

Abstract: A gear arrangement includes a first section having a first plurality of teeth and at least a portion of the first section is made of a compliant material. There is also a second section having a second plurality of teeth. The second section is made of a stiff material. The first section is arranged axially adjacent to the second section and each of the first plurality of teeth has a tooth flank that changes axially across the tooth flank. A method for manufacturing a gear arrangement includes fabricating a first gear, which includes a first plurality of teeth, and a bearing from a compliant material. The method also includes mounting a second gear, which includes a second plurality of teeth, to the bearing, aligning the first plurality of teeth with the second plurality of teeth, and coupling the first gear with the second gear.

Abstract: By utilizing a mechanical backlash generated between an electric actuator and a shift range switching mechanism, a specific region is obtained, in which a variation in the output shaft angle is relatively small with respect to a variation in rotor angle. In this specific range, an actual shift range position is calculated, whereby the rotor angle that the motor controller recognizes is corrected so as to relate the actual shift range position. A deviation between the rotor angle and the actual shift range is corrected, so that the shift range switching is precisely performed.

Abstract: This braking system (S) is adapted to be used with a mechanism having one or several turning members (34), and comprises a toothed wheel (6), connected in rotation with at least one turning member (34) to be braked, and an endless screw (8), driven in rotation by a motor (5) during rotation of the turning member (34), this screw (8) being in permanent engagement with the toothed wheel (6). The screw (8) is contained in a bore of a diameter slightly greater than that of the screw (8).

Abstract: The invention concerns a gear for precision devices comprising at least two mutually co-operating toothed wheels (10, 14). The teeth (12, 16) of the two wheels have the same thickness (e) and the teeth of one of them (10) are provided with a radial slot (26) which divides them into half-teeth (22, 24). On of said half-tooth (24) comprises a recess (28) enabling its elastic deformation in case of overloading.

Abstract: An endplay structure is provided for controlling endplay of a shaft 25 of a motor 19. The endplay structure includes a body 22 including a generally elliptically shaped recess 26 therein. The recess is constructed and arranged to be disposed generally adjacent to an end of the shaft. An engagement member 28 has a generally spherical portion constructed and arranged to be received in a press-fit arrangement with the recess. The engagement member has a surface 32 constructed and arranged to contact the end of the shaft. Whereby, when the surface of the engagement member is contacted by the end of the shaft, the spherical portion of the engagement member is press-fitted into the recess to control endplay of the shaft.

Abstract: A gearing radius of a worm wheel is set corresponding to a neighborhood region of a steering neutral position, in such a way as to be relatively large. Thus, backlash is made to be relatively small. This prevents noises from being produced when an automobile travels straight on a bad road. Conversely, the backlash is set corresponding to most of regions of steering angles, which are within the remaining region thereof, in such a manner as to be relatively large. Thus, increase in resistance torque is suppressed. This is realized by a simple configuration in which a bias portion is provided in a part of the profile of teeth. In a case where power is transmitted from an electric motor by a worm shaft and a worm wheel during a steering operation, noises are hard to be produced even when the automobile travels on a bad road.

Abstract: A moving member fixing apparatus includes a stationary gear, rotary gear, press member, and first and second flat inclined surfaces. The rotary gear is movably provided to the stationary gear. The press member presses the rotary gear to fix the rotary gear to the stationary gear, and cancels pressing the rotary gear so that the rotary gear is released from the stationary gear. The first flat inclined surface is formed to be associated with the stationary gear.

Abstract: A controller for motor activation providing accurate and repeatable position changes by pressing and releasing a push button switch. Repeatable position changes are made in an advance direction by triggering a digital counter for a predetermined number of cycles of a reference clock signal. Backlash in retard motion of the motor is reduced by similarly asserting a retard motor input for an amount of time determined by another digital counter with a following advance correction made automatically after the retard signal is applied, by applying a predetermined retard-advance movement amount, as again counted by a digital counter. The advance binary amount, the retard binary amount and the retard-advance binary amount of set through binary switch inputs to respective counters to count the respective time periods (TG3, TG1, and TG2).

Abstract: A transmission apparatus includes a gear having a plurality of gear teeth and a rack having a plurality of rack teeth to mesh with the gear teeth. The rack further has an end formed as a cantilever beam structure. In an initial contact of the gear teeth with the rack teeth at the cantilever beam structure of the rack, the cantilever beam structure can deflect to buffer an impact resulted from the contact so that the meshing of the gear teeth and the rack teeth can be much smoother and possible collision in between can also be avoided.

Abstract: A meshing gear assembly includes a toothed disk that is supported on a first gear so as to be frictionally engaged therewith, but rotationally and radially movable relative thereto. The circumferential width of each tooth formed on the toothed disk is preferably larger than the circumferential width of each tooth formed on the first gear, and the outer diameter of the toothed disk can be larger than the outer diameter of the first gear. The first gear and the toothed disk mesh with a second gear such that as the second gear rotates, the toothed disk and the first gear also rotate. However, the toothed disk and the first gear rotate at different speeds because the difference in the number of teeth formed thereon. Because the teeth formed on the toothed disk have a larger circumferential thickness and a larger outer diameter than the teeth formed on the first gear, a tight meshing engagement with the second gear is provided.

Abstract: An automatic transmission apparatus comprising, a first member rotating integrally with an input shaft and including a first cylindrical portion having an inner spline at an inner peripheral surface, a second member including a second cylindrical portion having an outer spline for engaging with the inner spline of the first member and a depressed portion formed on the second member and a clearance, which establishes a communication between an inner portion surrounded by the first and the second members and an outer portion of the first and the second members, is formed between the depressed portion of the second member and the inner surface of the first member.

Abstract: A gear mechanism includes a driving gear, a driven gear, and an idler gear which is in mesh with the driving gear and the driven gear, wherein rotation of the driving gear is transferred to the driven gear via the idler gear. The idler gear includes first and second spur gears which are positioned adjacent to each other in an axial direction and are generally centered about a common axis, radial teeth of the first and second spur gears each being the same in shape, pitch and the number of teeth, and the first and second spur gears being biased to rotate in opposite directions. The first and second spur gears are connected so as to be relatively movable in a radial direction normal to the axial direction while maintaining the first and second spur gears in mesh with the driving gear and the driven gear.

Abstract: A worm 1 is composed of an annular tooth body 11 having a tooth 10 on the outer surface thereof, a core body 12 inserted inside the annular tooth body 11; and an elastic coupler 13, which can be transformed in the radial direction, for coupling the core body 12 with the annular tooth body 11. The worm 1 is engaged with the worm wheel with the elastic coupler 13 being transformed in the radial direction in such a manner that a negative amount of backlash is generated at the engagement portion. This can be also employed for the worm wheel. With a reduction gear combination having this structure, the backlash amount at the engagement portion can be adjusted to a proper amount without selecting elements such as the worm and the worm wheel to be assembled.

Abstract: A final control element for superimposed steering engagement of a vehicle steering system with a superposition gear having two input shafts and one output shaft, in order to attain a radial freedom from play, the superposition gear is provided with a two-stage, modified planetary gear, having a planet carrier, at least one stepped planet comprising two axially aligned planet wheels connected to one another fixed against relative rotation, and two sun wheels or ray wheels; the first input shaft is connected to one sun or ray wheel, and the output shaft is connected to the other sun or ray wheel, fixed against relative rotation, while the planet carrier is drivable via the second input shaft, and the at least one stepped planet and the sun wheels are biasing toward provided for suppressing a tooth flank play that occurs between.

Abstract: A mechanism for de-lashing a gear assembly includes a first gear rotatable about a first axis and a first center rotatably fixed to the first axis and a first conical teeth portion. The gear assembly includes a second gear rotatable about a second axis and a second center rotatably fixed to said second axis and a second conical teeth portion configured to meshingly engage first conical teeth portion when the first and second gears are aligned substantially coplanarly. A biasing means operably biases the second conical teeth portion of the second gear against the first conical teeth portion of the first gear to reduce any lash therebetween. The biasing means is configured to bias the second gear in an axial direction while maintaining a fixed center distance between the first and second axes. The first gear is rotatably fixed about the fixed first axis such that the first gear is prevented from translation along the fixed first axis.

Abstract: A gear wheel comprises a first gear wheel portion, including first half-teeth, which can be coupled to a second gear wheel portion, including second half-teeth, by adjustable coupling means, so that the first and second half-teeth form by pairs the teeth of the gear wheel. The second gear wheel portion can be turned with respect to the first gear wheel portion about the rotary axis of the gear wheel, and can be locked by the adjustable coupling, so as to change the distance of the first and second half-teeth in each pair.

Abstract: The moving part has a hub (2) turning on its axis (A) and a transmission or working zone (4) intended to come into contact with a moving or fixed element, an elastic zone (3) likely to undergo a deformation being placed in between the hub (2) and the transmission or working zone (4).

Abstract: A device for compensating for the tooth backlash between two toothed gears in engagement with one another, with a toothed disk, which is connected in parallel with one of the toothed gears and provided with the same gear pitch, and which is held such that it can be hydraulically adjusted relative thereto until it bears against the non-force-transmitting tooth flanks of the mating toothed gear. In order to achieve a design that is as simple as possible and requires little mounting space, there must be provided at least one hydraulic adjusting element, which exerts an adjusting force in circumferential direction on the toothed gear and which is equipped with a steel piston held adjustably in a housing and urged by a spring as well as by pressurized fluid supplied via a check valve.

Abstract: A gear stage assembly having a gear stage with two meshing gearwheels for mechanically transmitting a torque includes individual magnets arranged in the form of a ring on each of the gearwheels in a manner corresponding to that of the teeth of the gearwheels, for producing magnetic forces in the gear stage, individual magnets of respective ones of the magnets formed in a ring being arranged with alternating polarity in the direction of rotation and forming a stage of magnets in a ring disposed parallel to the gear stage, for producing a preload torque in the gear stage; and a varnishing unit including the gear stage assembly.

Abstract: The gear mechanism for minimizing backlash may include a convoluted spring positioned between an external spline of a gear or shaft and an internal spline of a gear. The gear mechanism may include a cam and cam follower arrangement upon two adjacent gears positioned on the same shaft. Two stacked gears may include a U-shaped backlash eliminating element passing through both gears. The gear mechanism may include rollers which may be conically shaped.

Abstract: An axial adjusting device comprising two discs which are rotatable relative to one another, which are supported coaxially relative to one another and between which there are guided balls in pairs of ball grooves whose depth varies across the circumference. Of the discs, one is axially supported and one is axially displaceable against resilient returning forces of spring means. At least one of the discs is rotatingly drivable by a driving motor. For load reducing purposes, at least two balls are guided in each of the pairs of ball grooves.

Abstract: To provide a backlash-free rack simple in structure and small in size, still assuring that no backlash is caused in reciprocating a movable part in an electronic device toy, or watch et al, the rack structure comprises first and second toothed bars both integrally connected to each other by an intermediate joint made of a soft resin material to provide a linear toothed bar object. The linear toothed bar object is so folded about the intermediate joint that the first and second toothed bars are somewhat staggered and laid on each other with their teeth out of phase, thereby preventing the backlash which otherwise, would be caused between the teeth of the rack and those of the pinion.

Abstract: Apparatus and method for reducing backlash in a gear wheel (10) including at least two interacting gear rims (11, 12) that can rotate in relation to one another. At least one adjusting means (15) is located between the gear rims for adjusting the relative angle of rotation of the gear rims about a common axis of rotation. The adjusting means (15) includes an hydraulic cylinder which is connected to a pressure medium source and is arranged so as to act between two gear rims (11, 12). In this connection, a force arises, which tends to displace one gear rim in relation to the other about the axis of rotation.

Abstract: A vibration reduction gear structure of an image input and output device includes a first gear supporting a second gear, and a vibration reduction portion made of vibration reduction material mounted on at least one of the first gear and the second gear. The other gear is rested on the vibration reduction portion. In such a manner, when the first gear and the second gear are rotated synchronously, the vibration between the first gear and the second gear may be reduced by the vibration reduction portion.

Abstract: A torque transmitting device having a rotating shaft and a gear connected to the shaft. The gear transmits the torque between the rotating shaft and the gear. A splined portion and a centering inner circumferential surface portion formed in the inner periphery of the gear are engaged with the splined portion and the centering outer circumferential surface portion formed on the outer periphery of the rotating shaft. This arrangement minimizes noise due to gear runout, and reduces wear in the gear.

Abstract: In a gear train having a first gear, a second gear in mesh with the first gear, and a third gear in mesh with the second gear, an anti-backlash mechanism having a first anti-backlash gear positioned in operative relationship with the first gear and the second gear, a second anti-backlash gear positioned in operative relationship with the second gear and the third gear, whereby the first anti-backlash gear controls backlash between the first gear and the second gear, and the second anti-backlash gear controls backlash between the second gear and the third gear.

Abstract: An electric power steering apparatus in which steering assistance is achieved by transmitting a rotary motion of an electric motor for steering assistance to a steering shaft on which a worm wheel is mounted through a worm shaft on which a worm is mounted, wherein the worm shaft is deflectable toward the worm wheel and equipped with a biasing member biasing the worm shaft in the deflective direction thereof, or alternatively, the worm wheel is deflectable toward the worm shaft and equipped with a biasing member biasing the worm wheel in the deflective direction thereof.