Abstract: A gear assembly comprising two gears and a spring in the form of a C-shaped clip interconnecting the two gears. Two pins are provided on one of the two gears and the spring has two holes, one in each end thereof, whereby the spring can be carried by one gear in a pretressed state by means of the pin-and-hole connection. The other gear has a groove to cover the spring, thus the assembly work can be accomplished simply by resting the second gear to the first gear. An end wall of the groove engages with an end of the spring to create a spring force necessary to provide non-backlash mating with a third gear.

Abstract: A swivel shaft backlash correcting device for an arc welding robot in which backlash is eliminated, even if the gear teeth of the assembly are significantly worn. A spur gear is mounted at one end of a gear shaft, and an uprightly extending first pin is fixed to a flat part of the spur gear, the shaft being coupled through a speed reducer to an electric motor. A second pin is fixed to a flat part of a correcting gear having the same diameter and number of teeth as the spur gear and being mounted on the same shaft as the spur gear above the spur gear. A retaining ring is engaged with the first and second pins in one of a contracted or compressed state thereof so as to apply a force of expansion between the gear shaft and correcting gear. A center gear is secured to a stationary stand and engaged with the correcting gear and spur gear.

Abstract: A line spacing mechanism for printing machines comprises an electric motor which is operable to rotate selectively in either direction. A worm on the shaft of the motor meshes with a helicoidally toothed wheel to cause a platen roller to rotate in the clockwise direction or the anticlockwise direction. The motor is support pivotally by trunions and urged by a spring to eliminate radial play between the worm and toothed wheel. Another spring, lever and ball apply thrust to the motor shaft to take up axial play in its bearing, i.e. between the worm and the motor.

Abstract: A gear assembly for high-speed transmission between either two parallel shafts or two intersecting shafts comprising two meshing gears, one mounted to a drive shaft and the other mounted to a driven shaft, each of the gears having coaxially disposed first and second toothed portions which differ from each other in that the teeth of the first toothed portion are cut at a first inclination angle and the teeth of the second toothed portion are cut at a second inclination angle different from the first inclination angle. One of the meshing gears is fixed to its shaft so as to be non-displaceable axially, while the other is mounted so as to be axially displaceable with respect to the fixed gear.

Abstract: In a tilt steering equipment including a main bracket mounted to a vehicle body; an upper bracket with a steering wheel, which is pivoted at the main bracket around a tilt center; and a driving means supported by the main bracket to tilt the upper bracket against the main bracket, the driving means in fixed to the main bracket and has a drive center spaced from the tilt center and an engaging pin which rotates around the drive center. The upper bracket has an engaging slotted hole in which the engaging pin is inserted. According to the tilt steering equipment of this invention, the drive center of the driving means is spaced from the tilt center. Therefore, it is easy to assemble the equipment with high accuracy and a smaller torque is enough to tilt the upper bracket to the main bracket.

Abstract: A pair of pinions are mounted on a hub portion of a steering wheel in a manner to be movable toward and away from a pair of matched internal gears. The pinions are urged by a pair of leaf springs toward the internal gears to eliminate backlash therebetween.

Abstract: An internally splined rotary anti-backlash component is adapted to engage an externally splined injection-pump shaft end. Fixing pins extend radially through the component and have wedge-shaped ends which protrude into gaps between the splines of the shaft end. This inhibits backlash between the component and the shaft end for a predetermined sense of rotation of the component relative to itself. The component can be disengaged from the shaft end, turned around back-to-front, and re-engaged, to allow the sense of drive to be reversed.

Abstract: A steering wheel includes a steering shaft, column and pad sun gears mounted on the steering shaft for rotation relative thereto, a boss plate mounted on the steering shaft between the sun gears and rotatable in unison with the steering shaft, at least one bearing mounted on the boss plate and movable toward and away from a center of the boss plate, a planet shaft rotatably supported by the bearing, and column and pad planet gears mounted on opposite ends of the planet shaft and held in mesh with the column and pad sun gears, respectively, the planet gears having inner side surfaces rotatably held in contact with opposite outer side surfaces of the bearing.

Abstract: A zero backlash device. The device includes a spring loaded bracket for providing a lateral force to the driving nut on a threaded rod. This lateral force is directed perpendicularly to the axis of the threaded shaft thus insuring continued intimate contact between the threads on the driving nut and the threads on the shaft.

Abstract: A structure providing minimum fit mounting and rigid locking of a worm and gear drive includes a gear rotatably supported to a base, a worm drivably engaging the gear and bearings supporting the worm for rotation about its axis. A housing supports the worm bearings and is itself rotatably supported to the base for rotation about a second axis, which axis is parallel to but eccentric from the worm axis. Means are provided for pivoting the bearing housing such that the eccentricity of the pivot axes causes the worm to move toward the gear for close mounting and/or rigid locking therebetween.

Abstract: A hinge for a seat, particularly a power vehicle seat, has a stationary hinge member associated with a seat part of the seat, a pivotable hinge member associated with a backrest part of the seat, a pivot axle pivotally connecting the hinge members with one another, an adjusting and fixing device arranged to determine a position of the hinge members relative to one another and formed as a wobble transmission including an eccentric member associated with a cam region of the pivot axle and rotatable together with the latter, an accumulator arranged in the cam region of the pivot axle to radially adjust an eccentricity which determines an engaging point of the wobble transmission and formed as an eccentric ring with an inner longitudinal opening in direction of eccentricity and surrounding a centric portion of the pivot axle, a pressing member located between the longitudinal opening and the centric portion of the pivot axle and arranged to be pressed by the accumulator for maintaining an extreme eccentricity in

Abstract: A bevel gear backlash adjusting mechanism is disclosed in which a bevel gear is carried by a bearing and is rotatably carried by a stationary shaft so as to be axially shiftable therewith. The stationary shaft includes a supporting portion carried by the frame of a power tool, the supporting portion having a section slotted at an angle to the axis of the shaft. An adjustable slide is also supported by the frame and extends into the angled slotted section of the stationary shaft with an edge thereof formed as a ramp at an angle corresponding to the angle of the slotted section and in engagement therewith. Motion of the adjustable slide normal to the shaft will influence axial motion of the stationary shaft and the bevel gear carried thereon so as to allow an adjustment of the mesh between the bevel gear and its associated bevel gear.

Abstract: A gear assembly for automobile transmissions includes a pair of driving and driven gears permanently in meshing engagement with each other to provide a torque transmission therebetween, and an additional gear relatively rotatable at one side of either one of the gears and being permanently in meshing engagement with the other gear to rotate at a gear ratio different from that of the driving and driven gears, and in which the additional gear is resiliently in contact with one end face of the gear adjacent thereto to restrain a relative rotation between the driving and driven gears. The toothed portion of the gear adjacent to the additional gear is formed at one end thereof with an annular stepped portion for provision of a predetermined annular gap between the additional gear and one end of the toothed portion of the gear.

Abstract: A damping system for a drive train having a cam coupling mechanism which advances an intermediate member axially along a driven shaft under high torque loads. The intermediate member is spring biased and is associated with a variable volume chamber containing fluid. Damping mechanisms are positioned concentrically within the driven shaft and are in communication with the variable chamber. The damping mechanisms include a check valve for one-way communication with the lubricant supply system of the associated engine, and a flow restricter for generating damping energy. An accumulator piston accommodates volume changes resulting from operation of the piston and allows for leakage flow from the system to insure renewal of oil without temperature build-up and oil deterioration.

Abstract: An anti-backlash mechanism for a machine drive is disclosed, wherein a shaft carries a rotary worm wheel having drive connections to the tangs of two back-to-back clutch units. The first clutch unit is connected to a rotatable shaft, concentric with the worm wheel, and having a first helical gear on its end. A second helical gear on the support shaft is torsionally and axially free to slip. The second gear is connected to the second clutch unit by a torque tube permitting relative axial movement to occur between the two. A first actuator biases the two gears apart, and a second actuator between the second helical gear and the clutch units provides clamping force to engage the mechanism. An output bull gear is in mesh with the pair of helical gears. To engage the mechanism, the second actuator is energized, impressing a snugging force on the discs of the clutch units, and driving the second helical gear in an axial direction toward the first helical gear.

Abstract: A servo-motor assembly for a machine slide having a rack and pinion drive that includes a servo-motor support with a pinion carrying output shaft all totally supported by and cantilevered on a pair of normally flat parallel springs that bias the motor support and pinion toward the rack to eliminate backlash.

Abstract: An extremely accurate and inexpensive true sidereal rate drive assembly for an astronomical telescope, the telescope including a base having a driven gear rotatable about the polar axis of the telescope, and the drive assembly including a housing mounted on one side of the base, a single low speed synchronous drive motor mounted in the housing, and a worm gear mounted on the drive shaft of the motor for directly coupling the motor to the driven gear. In addition, a thumbwheel may be provided which is coupled to the motor shaft through appropriate reduction gearing, and which serves as a fine adjustment control for the telescope.

Abstract: An adjustable mounting for a shaft on a thin metal support plate wherein a cylindrical lounting flange is punched out of the plate to form an opening, and a bearing is rotatably mounted within the opening. The bearing has a radial flange engaging the external side of the plate and has a threaded inner end extending beyond the inner end of the plate flange. A nut is threaded on the threaded end and has a bore telescoped over the plate flange. The inner end of the nut has an edge which is tightened against the internal side of the plate. The plate flange, the nut and the radial bearing flange rigidify the contiguous area of the plate to minimize deflection. A flat adjusting member lays against the outer side of the support plate and has a rectangular aperture with parallel side edges which mate with chordal edges on the radial flange of the bearing. Rotation of the adjusting member causes the bearing to rotate.

Abstract: A clutch interlocking mechanism for use in a pushbutton tuner wherein a drive gear provided on a clutch mechanism is meshed with a rack of a memory slide, a support bracket, on which the clutch mechanism is mounted, is supported, at one side thereof, by a frame on a chassis through a fulcrum pin and, at the opposite side thereof, provided with a tension spring to assure positive engagement of the drive gear with the rack. The clutch interlocking mechanism further comprises a resilient member provided for the fulcrum pin to eliminate looseness at the portion of the fulcrum pin.

Abstract: A gear assembly for an automobile gear transmission includes a pair of driving and driven gears permanently in meshing engagement with each other, an additional gear axially slidable and rotatable on a hub projection of the driven gear and being permanently in meshing engagement with the driving gear to rotate at a gear ratio different from that of the driving and driven gears, a synchronizer mechanism assembled adjacent to the additional gear and having a spline piece fixed to the hub projection, and a compression spring in surrounding relationship with the hub projection and being engaged at its one end with the additional gear and at its other end with the spline piece to be positioned in place without provision of a conventional snap ring.

Abstract: A gear arrangement is provided for precisely driving a goniometer in an X-ray apparatus with zero backlash. This arrangement involves structure for maintaining a preload between a driving pinion gear and a spiroid gear rotating an output shaft. The preload structure may be formed by way of a diaphragm, a finger diaphragm, or a roller bearing acting in combination with a finger diaphragm.

Abstract: The teeth of the sun pinion, planet wheels and hollow wheel have a profile correction changing continuously along the gear width and varying in opposite directions between the meshing gears. The sun pinion, hollow wheel and planet carrier are so mounted as to be fixed in the axial direction, whereas the planet wheels, allowed to slide individually in the axial direction on their stub shafts rigid with the planet carrier, are responsive to the axial force exerted by cup springs and mounted for swivel movement within predetermined limits on pendulum bearings. Furthermore, all the wheels, pinion and hollow wheel have crowned teeth.

Abstract: A forming machine (10) disclosed has an improved drive mechanism (28) for driving a pair of slides (20,22) mounted on upper and lower bases (12, 14) so as to provide forming of a workpiece for forming racks (24, 26) mounted on the slides. Upper and lower hydraulic motors (30,32) respectively drive the pair of slides whose movement is coordinated by a rotatable synchronizing gear (48) and upper and lower synchronizing racks (50,52). The synchronizing gear (48) is mounted by a connecting portion of the machine between the slides and is meshed with the synchronizing racks (50, 52) which are mounted on the slides by wedge adjusters (53) to adjust backlash of the synchronizing racks with the synchronizing gear. Both rotary and linear hydraulic motors for drivng the slides are disclosed. A pair of tie rod connections (150) preferably extend between the upper and lower bases to control deflection therebetween during the workpiece forming.

Abstract: A gear assembly includes a pair of driving and driven helical gears permanently in meshing engagement with each other to provide a torque transmission therebetween, and an additional plate-like gear formed at its outer periphery with helical teeth the helix angle of which is different from each helix angle of respective teeth of the helical gears and being resiliently deformable in an axial direction. The additional plate-like gear is coaxially and rotatably mounted in place on a hub portion of the driven helical gear and meshed at its two teeth with one tooth of the driving gear such that the additional plate-like gear is resiliently in contact with one end face of the driven gear at a place radially opposite to the meshed portion of the helical gears.

Abstract: To obtain unequal angles of turn for two-steerable wheels of a vehicle inexpensively, each wheel is turned through a gear. The two gears have a center to center distance corresponding to the track of the steerable wheels and are dimensioned to accommodate therebetween a meshing pinion mounted eccentrically on a swing arm. While driving one or each of the gears by means of a steering drive element in the same direction of rotation, the positive engagement of the two gears through the pinion and the eccentric mounting of the pinion on the swing arm produce a larger angle of turn of the wheel running inside the turn as compared to the angle of turn of the wheel running at the outside of the turn. To also ensure a steady, flutter-free straight run of the steerable wheels the swing arm end remote from the pinion is adjustable by a selected amount.

Abstract: A differential gear for automotive vehicles comprising a washer interposed between the backs of pinions and the inner surface of a differential casing and fitted to a pinion shaft. The washer has at most a thickness of l tan.alpha. wherein l represents a displacement from an uncompressed condition of a spring washer to a compressed condition thereof exhibiting a predetermined pressure against the side gears. With this arrangement, the pinions may be installed into the differential casing without applying any pressure through the spring washers to the side gears, and after installation of the pinions into the differential casing, pressure between the meshed gear teeth of the side gears and the pinions may be desirably determined.

Abstract: A printing mechanism includes a right-angle drive for imparting rotation to a rotary printing element having printing type thereon, rotation of the print element selecting a specific character to be imprinted on a printing medium. The right-angle drive permits the printing element to be moved transversely of the printing medium while receiving rotational mechanical signals for imparting the requisite rotation to the printing element. A shaft having a longitudinal keyway therein passes though a bevel gear of the right-angle drive, there being a key extending from the gear to the keyway to permit the sliding of the gear along the shaft while being controlled in rotation thereabout. A carriage carrying the rotary print element and the right-angle drive is driven in the transverse direction by a worm gear having a worm surface provided with inclined sides which mate with a pair of angled inclined rollers supported by the carriage for engagement with the worm gear.

Abstract: A scheme for accurately and quickly axially positioning a rotatable member such as the axles of a differential or a shaft supported impeller of a centrifugal pump within a housing or similar support for rotation therein with predetermined axial bearing clearance which is independent of the dimensional variations of the member and support is disclosed wherein a deformable spacing element is associated with each thrust carrying bearing with the adjacent bearing and spacing element being held axially captive between the shaft and a corresponding disc which is slidable relative to the housing and with one disc axially aligned and limited in sliding movement on one common direction opposite the direction from which the rotatable member is positioned by engagement with the housing. Typically there are two discs, one limited in movement toward the interior of the housing and the other limited in movement by the means of encapturing the rotating assembly.

Abstract: An improved ball nut having adjustable preloading comprises a pair of ball nut halves both in threaded engagement with a ball screw. Only one of the nut halves is secured to a movable machine member, the other nut half being movable to the relative fixed nut half. Separating the two nut halves is a pair of concentric sleeves, which are each fabricated from a piezomagnetic material such as nickel or nickel alloy. The sleeves are each keyed to the nut halves to prevent one nut half from rotating independently of the other. Between the sleeves is a magnetic coil which, when energized, causes the sleeves to expand. By varying the coil excitation, the sleeve length, and hence, the force exerted on the ball nut halves by the sleeves can be varied accordingly to vary ball nut preloading.

Abstract: A method and apparatus for minimizing backlash and improving the efficiency of speed reduction mechanisms in which a series of rollers are equally spaced in a circle on a disk to perform operationally somewhat like an internal ring gear. Mounted for eccentric movement and simultaneously engaging each of the rollers is an orbital rotor having a perimeter defined by an epitrichoid curve with a number of lobes equal to one less than the number of rollers. The rotor is mounted for free rotation on an eccentric keyed to a drive shaft. Rotation of the drive shaft causes the rotor to move orbitally and to rotate with a speed reduction equal to the reciprocal of the number of lobes on the rotor. Each roller is mounted for controlled omnidirectional compliance and preloaded to provide a controlled pressure between each roller and the adjacent surface of the rotor. The outer surface of each roller is crowned to increase the efficiency and prevent binding that might be caused by angular deflection of the roller.

Abstract: A crank mechanism in a pushbutton tuner which comprises a side plate secured on associated one end of crank bars and a crank gear mounted on the outer surface of the side plate, both being supported together by a caulked shaft and one of the crank gear and the side plate being formed with a protuberance formed by deforming a part thereof while the other is formed with a hole for receiving the protuberance.

Abstract: A tilt drive is provided for a metallurgical vessel which is mounted on a large sprocket wheel driven by two or more reduction gears. The reduction gears are joined by a torque equalizing apparatus which transmits torque from the pinion of one gear to the pinion of the other, thus acting as a forced synchronizer. The torque equalizing apparatus is effective in both the dynamic and static operations of the drive.

Abstract: A load-splitting transmission has its drive shaft journaled with respect to the housing in an axial bearing and supported only by a radial bearing forming part of the clutch connecting said drive shaft to the output shaft of an engine so that the axis of the drive shaft is swingable relative to the housing. The drive shaft carries a drive gear which meshes with a pair of load-splitting gears so that the swinging movement allows torque compensation between the two drive trains of which the load-splitting gears are a part.

Abstract: Disclosed is a carrier moving mechanism for preventing occurrence of the backlash between a screw shaft and a carrier transmitted by this screw shaft. This carrier moving mechanism comprises a screw shaft and a carrier having secured thereon first and second nuts having teeth to be engaged with the lead of this screw shaft, in which the teeth of the first nut are brought into contact with one side face of the lead of the screw shaft and the teeth of the second nut are brought into contact with the other side face of the lead of the screw shaft and the carrier is moved through these first and second nuts by rotation of the screw shaft.

Abstract: An anti-backlash nut construction wherein a base portion that is adapted to be carried by a machine part, has a bore through which a lead screw can pass. The nut has a threaded portion which is connected to said base portion and which has a bore matching with the bore of the base portion, said threaded portion having a slot or slots by which it is divided into elements formed with thread formations engageable with the external threads of the screw extending through said bores. The base portion has cut-out walls forming pairs of slot ends which are located adjacent the ends of the slots of the threaded portion, so as to facilitate limited movement of the said divided elements toward and away from each other, whereby the thread formations can engage the screw with no clearance and looseness. The pairs of slot ends, together with the ends of the slots that are disposed in the threaded portion form triangles, with the slot ends being separated from each other by solid walls of the base portion.

Abstract: A gear hobbing machine is provided with a hypoid gear set and a spur gear set for reducing the final drive to its work spindle. As a result of this arrangement, a wide range of machine speeds are available and reverse hand hobbing can be carried out.

Abstract: An elephant nose type arm for a programme controlled manipulator, comprises gears meshing with each other, connecting members for connecting the gears to each other and actuator for rotating the one of the gears to bend said arm.

Abstract: An elevator apparatus comprising a reduction gear unit having reduction mechanism of rotary parts of parallel axial gears, an input shaft and an output shaft as main parts; a main rope suspending a car and a counterweight; a traction sheave which is directly connected to said output shaft and on which said main rope is wound; and a traction motor for rotating said input shaft of said reduction gear unit comprises a friction device for imparting pushing force to said rotary parts of said reduction gear unit.

Abstract: An anti-backlash nut assembly is disclosed for longitudinal movement along a screw which has an external thread thereon, in response to relative rotational movement between the nut assembly and the screw. The assembly includes a first nut part having an internal thread complementary to the external thread of the screw, and a second nut part also having an internal thread complementary to the external thread of the screw. A coil spring is interconnected between the first and second nut parts for applying torque thereto and rotatably biasing the nut parts together to eliminate backlash therebetween and improve the positional accuracy of the nut assembly along the screw. A cylindrical collar is sandwiched between a pair of opposed portions of the nut parts and surrounds the coil spring. With this structural combination, the anti-backlash nut assembly can be adjustably preloaded by relatively rotating the nut parts to selectively preload the coil spring to a desired torque.

Abstract: A pressure control valve including a valve, a spring for pressing the valve, and a power input means for compressing the spring further comprises a backup force-generating mechanism for producing and directing a backup force counter to the direction in which the reaction force due to the compression of the spring is exerted on the input means, so as to impart the backup force to the input means.

Abstract: A novel load proportional antibacklash gear drive system is provided wherein each portion of a split pinion gear is provided with a pressure chamber connected to a torque sensor and servo control unit for controlling the pressure applied individually to each split gear portion, against opposing tooth faces of the driven gear. The servo control unit provides high pressure (hydraulic or pneumatic) to a first split gear portion for drive in one direction while providing low pressure to the second split gear portion in the opposing rotational sense to maintain contact of the split gear with both faces of the driven gear at all times, thereby eliminating backlash. Upon reversal of the direction of rotation of the gear system, the servo unit provides high pressure to the second split gear portion which then acts as the driving gear, and maintains low pressure to the first split gear portion to maintain it in contact with the driven gear to prevent backlash upon reversal of the direction of drive of the gear system.

Abstract: A marine drive is shown in which a reverse pinion, which is in continuous mesh with a bull gear, is provided with a detuner to prevent vibration while it idles. The detuner includes a ring gear detuner pinion disposed about the reverse pinion shaft. The detuner pinion has helical teeth as do the reverse pinion and bull gear. One end of the detuner pinion is slidably mounted on a ring which encircles the reverse pinion shaft adjacent the reverse pinion, and the other end of the detuner pinion is supported by a diaphragm assembly which prevents torsional and radial motion but permits axial movement of the detuner pinion. The diaphragm assembly is mounted on a sleeve which is secured to the pinion shaft and extends through, but out of contact with, the detuner pinion.

Abstract: A method and apparatus for adjusting tooth flank play between two sun gears and at least two planetary gears of a bevel gear differential drive is provided in which, after establishing the operating positions of both sun gears on their sun gear shaft, each planetary gear is shifted on its shaft, previously inserted into a transverse bore of the sun gear shaft, after which the planet gears are brought into their precise operating positions relative to the sun gears and perpendicular to the sun gear shaft and are stopped there with the maintenance of an equal tooth flank play to the sun gears, by first inserting the planetary shaft into the transverse bore of the sun gear shaft in an axially displaceable manner, then placing each planetary gear on its planetary gear shaft with a previously calculated axial distance from the sun gear shaft, and then adjusting an equal tooth flank play by axial displacement of the planetary gears with their planetary gear shafts in the transverse bore and finally fixing planetary

Abstract: The meshing bevel gears used to drive the vertical axis looptaker of a sewing machine are preloaded with a compressed resilient member which is prevented from deflecting to a position beyond its elastic limit during the running of the gears.

Abstract: A pivot drive for interconnecting a pair of members that are relatively pivotal about a pivot axis has a torsion rod extending along a rod axis and rotatable by an appropriate drive relative to one of the members. This rod has outer ends carrying input gears of respective constant-mesh gear trains having output gears at least one of which is limitedly rotatable about the pivot axis on the other member. This one output gear can be limitedly rotated and locked in place in the other member so as torsionally to prestress the rod, thereby eliminating play from the drive by bringing the gears of one of the gear trains into snug contact in one direction and the gears of the other gear train into snug contact in the opposite directions.

Abstract: A flying ram cutoff machine for severing successive lengths of an elongated workpiece continuously moving in the direction of its longitudinal axis employs a bevel gear drive for swinging a ram in synchronization with movement of the workpiece. A motor drive fly wheel and clutch assembly power a drive shaft which extends parallel to the longitudinal axis of the workpiece, at the rear of the machine. A pair of bevel gears disposed at spaced locations along the drive shaft form power take-offs for transmitting power from the drive shaft to a pair of input shafts which extend perpendicularly away from the drive shaft and toward the swingable ram. A pair of crank assemblies couple the input shafts with the ram to produce swinging movement of the ram upon rotation of the drive shaft. Backlash of the drive system is controlled by interposing a stabilizing spacer between one of the bevel gears and a stationary support.

Abstract: A method and apparatus for eliminating axial thrust and consequently the need for thrust bearings in parallel shaft and crossed-axis helical drive arrangements is disclosed. According to this invention, a gear with helically cut teeth which maintain a constant profile but have a uniformally tapered top land and bottom land, the top land of which increases in width as the bottom land decreases in width is mounted on a shaft. This tapered tooth helical gear is meshed with a second similar gear mounted in meshing proximity on a second shaft. During operation the axial forces associated with helical gears are resisted by the compressive interfacing, with zero backlash, of the tapered teeth. Thus, the need for thrust bearings is eliminated.

Abstract: A precision power gear train assembly particularly adaptable for use with vehicles having a 360.degree. rotatable turret mounted thereon. The assembly embodies novel spring and stop means to minimize backlash and to limit gear tooth disengagement of the enmeshed output pinion and ring gears of such an assembly. More specifically a pinion-ring gear assembly mounts a gear box to oscillate about an axis parallel to the pinion axis of rotation such that the tooth pressure between pinion and ring gear biases the teeth apart, increasing backlash. A preloaded spring biases the gear teeth into tight mesh to eliminate backlash until the tooth pressure force exceeds a predetermined maximum. Thereafter, further increases in the tooth pressure force separates the teeth by compression of the spring beyond its preloaded compression. A stop limits tooth separation.

Abstract: A gear system adapted to eliminate backlash between a set of reversible gears. The gears are also arranged to perform without backlash when their center distances are changed. One gear of the double helical type fixed to a first shaft is in engagement with a single adjustably secured first helical gear on a second shaft. A biased helical gear is slidably arranged on the second shaft adjacent the first helical gear, forcing the teeth of the biased gear against corresponding teeth of the double helical gear, automatically removing any clearance between them thus eliminating any backlash therewith, which is desirable for gears driving matched rolls.

Abstract: In a gear train where there is backlash, the backlash is prevented by a gear drive which includes an anti-backlash driven pinion which is mounted on, or is otherwise connected to, a torsion spring shaft that is adjustable for twisting, and thereby, loading the anti-backlash driven gear.