Abstract: A worm gear mechanism includes a worm, a torque-transmitting worm wheel meshing with the worm, and an auxiliary worm wheel disposed concentrically with the torque-transmitting worm wheel. The auxiliary worm wheel has a pitch circle diameter set to be greater than a pitch circle diameter of the torque-transmitting worm wheel and hence meshes with the worm in a meshing phase different from that of the torque-transmitting worm wheel. A screw thread provided on the worm actually meshes with teeth of the torque-transmitting worm wheel along a length defined as an actual meshing length. The screw thread has an effective length reduced to be approximately equal to the actual meshing length.

Abstract: A gear wheel includes multiple helical toothings, each having a different helical angle. A pressing method for molding a gear wheel involves introducing a compactable material into a chamber of a pressing tool, compacting the material, exposing the helical toothings of the gear wheel, and removing the molded body from the pressing tool. A pressing tool for pressing, as one part, a gear wheel, includes a matrix, cylindrical first and second molding tool parts which can be translated along and then rotated about a longitudinal axis, and a driver coupled to the molding tool parts or driving them. The molding tool parts can be moved towards and away from each other and the inner surface of the matrix delimits the chamber and is shaped to allow a linear axial sliding movement of the compactable material relative to the matrix.

Abstract: In a method of manufacturing multiple transmission units with individually selectable gear ratios that vary from unit to unit, a gear pair having a desired transmission ratio is selected from a multiplicity of interchangeable gear pairs that includes both spiroplan gears and conventional crown gear and pinion combinations. The selected gear pair is then installed into a housing having first and second bearing sections configured to support bearings in which the shafts of the selected gear pair are rotatably mounted. The bearing sections are configured such that, for every gear pair that may be selected from among the multiplicity of gear pairs, the bearing sections support the first and second shafts in such a position and orientation that teeth of the gears engage with each other and a longitudinal axis of one of the gears of the gear pair is offset by a fixed distance from a longitudinal axis of the other.

Abstract: A method of forming a powder metal forging, which includes the steps of providing a preform including a sintered powder metal composition; inserting the preform in at least one part of a die set having a top die and a bottom die, at least one of the top die and the bottom die defining a helical forge form therewithin; closing the die set wherein the top die is contacting the bottom die; and compressing the preform in the forge form using an upper punch including a core rod and a lower punch, the compressing step occurring after the closing step, the compressing step resulting in a formed part having a helical outer surface. The method and apparatus of the present invention is particularly advantageous when forming a powder metal forging helical outer surface and an inner contour such as a cylindrical inside diameter.

Abstract: A hypoid gear tooth surface design method, wherein normal lines and helical angles of two tooth surfaces are properly selected so as to position action limit curves (L3Acc) on the outer of the areas (R2t to R2h) where the tooth surfaces are formed, whereby undercut to a gear small end side can be prevented and, by setting the involute helicoids of two tooth surfaces on a pinion side to an equal lead, a pinion top land and a gear top land (z2h=0) can be made generally equal to each other in tooth lengthwise direction, such that sharpening of the top land can be prevented.

Abstract: An electric power steering apparatus includes a worm gear mechanism for transmitting the torque generated by an electric motor to a steered road wheel of the vehicle. The worm gear mechanism has a worm gear made of metal and a worm wheel formed of plastic material and meshing with the worm gear. The worm gear has a tooth profile including a dedendum part formed in an involute shape and an addendum part formed in a circular arc shape with a center located on a line of action.

Abstract: A resin worm wheel is formed by injection molding and includes a first end and a second end. The worm wheel is adapted to be driven by a worm. The worm wheel further includes: an engaging portion including a plurality of teeth engageable with the worm and a tooth space formed between the neighboring teeth; a first non-engaging portion adjacent to the engaging portion at the first end of the worm wheel and not engaging with the worm; and a first cutout portion formed at the first non-engaging portion continuously from the tooth space, the first cutout portion extending axially.

Abstract: A kitchen appliance in the form of a stand mixer has an electric motor driving a mixing implement via a gear box. The gear box includes a worm on a shaft mating with a worm gear to achieve speed reduction and a change in the axis of rotation.

Abstract: Within the systems used to transmit power and or movement between two shafts, toothed wheels can be used. Also, pairs of screws with their complementary threads engaged can be used. A geometry is described for the thread profiles, for screws used in the transmission of power and or movement between two shafts. That geometry enables the threads to have the widest possible contact. The shafts can be in any relative position: parallel, perpendicular, neither coplanar nor perpendicular, coplanar or not.

Abstract: There are provided a resin double helical gear capable of reducing operation noises and vibrations of an image forming system, such as an ink jet printer, which is arranged in the vicinity of an operator, and a gear train using the same and having a smaller number of parts. The gear train 2 for ink jet printer 1 includes a first resin double helical gear 5 which is mounted on an output shaft 4 of a motor 3 so as to be rotatable therewith, and a second resin double helical gear 6 which is mounted on a paper feeding roller shaft 7 so as to be rotatable therewith and which meshes with the first resin double helical gear 5.

Abstract: There are provided a resin double helical gear capable of reducing operation noises and vibrations of an image forming system, such as an ink jet printer, which is arranged in the vicinity of an operator, and a gear train using the same and having a smaller number of parts. The gear train 2 for ink jet printer 1 includes a first resin double helical gear 5 which is mounted on an output shaft 4 of a motor 3 so as to be rotatable therewith, and a second resin double helical gear 6 which is mounted on a paper feeding roller shaft 7 so as to be rotatable therewith and which meshes with the first resin double helical gear 5.

Abstract: There are provided a resin double helical gear capable of reducing operation noises and vibrations of an ink jet printer, and a gear train for an ink jet printer using the same. The gear train 2 for an ink jet printer 1 includes an output gear 5 of a motor 3, a first idle gear 6 meshing with the output gear 5, a second idle gear 7 rotatable with the first idle gear 6, and a driven gear 8 which is mounted on a roller shaft 13 so as to be rotatable therewith and which meshes with the second idle gear 7, wherein a resin double helical gear 101 is used as each of the output gear and the first idle gear, and a spur gear is used as each of the second idle gear and the driven gear. The resin double helical gear may have a meshing relief portion 113 by cutting a chevron-shaped top portion 104 in a central portion 103 in face width directions, which is arranged in a butt portion 113 between a first die 108 and a second die 110, from a tooth crest to a portion near a bottom land so as to decrease a tooth thickness.

Abstract: A slide mechanism of a linear transmission apparatus includes an actuating mechanism, a guide screw and a slide mechanism. The slide mechanism includes a fixing base, a primary guide rail, left and right secondary guide rails and a slide element. The fixing base has a through hole for passing the guide screw. The primary guide rail and each secondary guide rail are engaged to the guide screw and connected to the fixing base. The primary guide rail has a top panel and two side panels. Each secondary guide rail has an extended panel protruded from a side proximate to the primary guide rail. The top of each extended panel is not lower than the bottom of the side panel, and the slide element is sheathed onto the exterior of the guide rail, and a nut secured to the guide screw is formed in each guide rail.

Abstract: In a resin double-helical gear formed by injection-molding, smooth meshing of teeth can be performed for rotation of the resin double-helical gear in both directions, and occurrences of thrust-direction load and noise can be prevented. Peak-side tooth flanks 7c and 7d and valley-side tooth flanks 7e and 7f of a tooth 7 in a resin double-helical gear 1 are formed such as to become farther away from peak-side tooth flanks 9c and 9d and valley-side tooth flanks 9e and 9f of a standard tooth 9 in an inward direction, the closer the peak-side tooth flanks 7c and 7d and the valley-side tooth flanks 7e and 7f are to a tooth width direction center section 3 from one tooth width direction end section 4a and another tooth width direction end section 4b. As a result, meshing escape sections g (g1 and g2) and h (h1 and h2) having dimensions in a tooth thickness direction that increase towards the tooth width direction center section 3 are formed on the peak-side tooth flank side and the valley-side tooth flank side.

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 gear wheel includes multiple helical toothings, each having a different helical angle. A pressing method for molding a gear wheel involves introducing a compactable material into a chamber of a pressing tool, compacting the material, exposing the helical toothings of the gear wheel, and removing the molded body from the pressing tool. A pressing tool for pressing, as one part, a gear wheel, includes a matrix, cylindrical first and second molding tool parts which can be translated along and then rotated about a longitudinal axis, and a driver coupled to the molding tool parts or driving them. The molding tool parts can be moved towards and away from each other and the inner surface of the matrix delimits the chamber and is shaped to allow a linear axial sliding movement of the compactable material relative to the matrix.

Abstract: A ball-worm transmission is provided which replaces the sliding friction of the classic worm mechanism with the rolling friction of spherical balls. The ball-worm transmission assembly includes a worm which defines a recirculation path, and a gear coupled to the worm via a plurality of spherical balls. The gear includes a plurality of teeth each having a thickness in a central plane of the gear and a lesser thickness towards both sides of the gear, so that a gap is defined between the teeth is larger towards both sides of the gear than in the central plane of the gear.

Abstract: Enveloping worm threads with less than one revolution have on one side concave surface and on another side convex surface. This makes generation of concave and convex enveloping worm surfaces simultaneously and makes modification of surfaces by individual machining of each surface. Proposed method uses cutting edges that have rotation radius according with radius of curvature of machining surface. Another variation simultaneously cuts several threads, where enveloping worm blank has rotation around its own axis of rotation and relative motion to helical cutter around tooling axis. This reduces production cost and makes manufacturing easily.

Abstract: A method of manufacturing herringbone gears starting with non-hardened cylindrical stock material, establishing a relief notch for each tooth in the cylindrical stock where the two helices meet, roughing the double helical teeth, and case-hardening the gear teeth. The teeth are then finished using high accuracy Cubic Borzon Nitride (CBN)-faced cutters with the relief notch allowing run-out of the cutters.

Abstract: Present invention provides a single screw compressor from which only a small amount of gas to be compressed leaks and which can be manufactured at low costs. There are provided a screw rotor 1 having six grooves 2, 2, . . . and a gate rotor 4 having 12 teeth 5, 5, . . . which are installed in a casing. Since six, which is the number of the grooves of the screw rotor 2, and twelve, which is the number of the teeth 5 of the gate rotor, have a common divisor, only predetermined teeth 6 are engaged with a groove 2. Therefore, engagement combinations of the grooves 2 and the teeth 5 are divided into six groups. In each of these groups, dimension accuracy is controlled so that the grooves 2 and the teeth 5 engaged each other have appropriate clearances. Since manufacture is easier when dimension accuracy is controlled within each group than when dimension accuracy of all grooves 2 and teeth 5 is controlled at one time as in a conventional case, this single screw compressor becomes inexpensive.

Abstract: The size, weight, and cost of a full-traction differential are significantly reduced by the synergism of several interrelated design features of a cartridge-like gear complex: (1) Each combination gear has only a shallow journal hole in each end of an otherwise solid gear body, being supported on mating hubs fixed to mounting plates slipped into a one-piece differential housing. (2) The solid worm-wheel portion of the combination gears has a deeper hour-glass shape. (3) Mating worm/worm-wheel teeth have a broad “supra-enveloping” contact pattern on only the drive side of the mesh. (4) The side-gear worms have closed-end teeth. (5) Both diameter and axial length of the side-gear worms are reduced by a special cutting process. The efficiency of the differential is increased by a thrust plate supported in the mounting plates and positioned between inner ends of the side-gear worms.

Abstract: A worm/worm gear assembly comprises a worm having teeth defined by at least one thread disposed thereon and a worm gear having teeth protruding from a surface thereof. At least one of the worm and the worm gear is fabricated from a resilient material. The teeth of the worm and the teeth of the worm gear are interengaged and in a compressive relationship with each other to maintain double flank contact therebetween. At low- or no-load conditions, the double flank contact is made at the opposing outer edges of each of the teeth. At moderate-load conditions, the contact extends from the opposing outer edges of each of the teeth toward the center of each of the teeth. A method for delashing a gear system comprises disposing the worm in mechanical communication with the worm gear and loading the worm gear to cause the worm gear to compressively engage the worm.

Abstract: A universal power operator for shifting a movable barrier, such as a gate, and a circuit control system for operation thereof, is shown that allows the operator to be assembled for both a left-hinged or right-hinged movable barrier. The universal power operator includes generally an actuator arm, a housing assembly, a gear assembly, and a modular drive motor. The housing assembly contains generally symmetrical portions allowing the user to interchangeably assemble the motor in one of two positions for use with a left-hinged or right-hinged movable barrier.

Abstract: An electric power steering apparatus comprising a rack shaft having two racks, a first rack-and-pinion mechanism for transferring a steering torque to the rack shaft, and a second rack-and-pinion mechanism for transferring an assist torque to the rack shaft. The second rack-and-pinion mechanism includes a pinion and a rack both being helical gears so that a large torque can be transmitted to the rack shaft. Teeth of the pinion and rack are arc profiled. The arc profiled teeth mesh with each other through a large contact area of concave and convex surfaces thereof and hence with a reduced contact pressure compared to involute profiled teeth. The arc profiled teeth thus have increased surface fatigue strength, bending strength and bending fatigue strength and can transmit an assist torque sufficiently to the rack shaft. Moreover, they have durability sufficient to withstand a torque load of a motor inertia.

Abstract: A pumping device in connection with saw chain lubrication, especially in connection with a hand-held device, e.g. a chain saw, the pumping device including a pumping house, a piston that is received in the pumping house and means to bring the piston to rotate and simultaneously perform a reciprocating motion in its longitudinal direction, the means including on one hand a worm pinion having means for driving cooperation with a prime mover and on the other hand a gear pinion mounted on the piston. The invention further relates to a worm pinion, preferably included in a device for saw chain lubrication. The invention is characterized in that the worm gear on one hand includes a spirally shaped element, prefabricated as a separate detail, and intended to cooperate with the gear pinion and on the other hand a sleeve shaped element that supports the spirally shaped element.

Abstract: An inspection apparatus (40) for remote inspection of the trepan radius area (34) of the inlet sleeve (24) of a steam turbine (10). The apparatus (40) provides a sealed volume (50) between a pair of inflatable bladders (46,48) for the introduction of a liquid couplant for the immersion of ultrasonic transducers (42,44). A laser line generator (62) generates a beam of light visible through camera (60) which impinges upon the inlet bell seal (30) when the apparatus (40) is in a proper inspection position within the inlet sleeve (24). Guide vanes (56) provide centering and generate an insertion force during air assisted insertion of apparatus (40). Transducers (42,44) are indexed axially and circumfretially by the independent rotation of axial drive gear (72) and longitudinal drive gear (70) engaged with a pattern of gear teeth (69) formed as a combination of circumferential spur gear teeth and axial rack gear teeth cut into a single surface of a spline shaft (68).

Abstract: An electric power steering apparatus includes a worm wheel having an annular tooth portion made of synthetic resin and a boss portion made of metal. The annular tooth portion has teeth that engage with a worm, and the boss portion is fitted to the annular tooth portion. One of an inside peripheral surface of the annular tooth portion and an outside peripheral surface of the boss portion has concaves disposed on both axial ends thereof, and the other has convexes fitted into the concaves. The radial length of these concaves and convexes is 1 to 2.5 times as large as the axial length of the concaves and convexes.

Abstract: This invention relates to a single screw compressor comprising a body housing a spindle, a screw and two pinions for engaging the screw, wherein both said pinions and said screw have unequal-width teeth, the diameter along said screw in an outer profile is varied, and the range of the closing angle formed when one of said pinion teeth engages,, with and is in close contact with one of the grooves of said screw is from 60° to 66°. The compressor according to the present invention has advantages such as high gas discharge volume, high Energy Efficiency Ratio, smallbulk, high rigidity with the pinion stand and durability.

Abstract: An electric power assist apparatus for motor vehicle power steering including an electric motor and a speed reducer. The speed reducer includes a worm and a molded plastic worm gear on an output shaft of the speed reducer. The polymer from which the worm gear and the integral worm gear teeth thereon is molded has substantial structural rigidity after becoming cured. A plastic tooth ring is insert molded on the worm gear from a polymer having substantially greater resilience after becoming cured. The plastic tooth ring includes a plurality of resiliently flexible gear teeth having flanks which circumferentially overlap the flanks of the worm gear teeth. When the electric motor is off, the gear teeth on the worm mesh with the resiliently flexible gear teeth on the tooth ring with zero clearance to suppress noise attributable to rattling between the worm and resilient flexure of the flexible gear teeth on the tooth ring until the worm teeth engage the structurally more rigid worm gear teeth.

Abstract: A gear for use as the pinion in a rack and pinion gear includes spur gear teeth that have an upper portion of the face cut in a worm cut so the gear is effective as a worm wheel for a worm gear while retaining involute curved faces so it is effective as the pinion for the rack. The rack, pinion, and worm driver are connected. When the worm gear connected to a shaft, power is transmitted from the shaft to the rack via the worm driver and pinion with all gears making line contact instead of point contact. This improvement turns one gear piece into two gears. The rack pinion can be geared to a worm gear while it is also matched up with a straight cut rack. In this way the gear translates force between the two different types of gears.

Abstract: A drive gear engages a driven gear with non-intersecting axes of rotation making an angle of approximately 90° with respect to one another. A shaft has a first portion with a predetermined diameter, and a second portion has an enveloped worm gear with at least one roll-formed helical tooth formed thereon with an outer diameter greater than the diameter of the first portion of the shaft. The extra envelopment achieves an overall smaller package size for competitive advantage. When the shaft is rolled, the outside teeth exceed the shaft diameter by a predetermined amount allowing more teeth to be in contact with the driven gear. An outer bearing can be placed at the end of the shaft to allow the teeth to be of a larger diameter than the shaft. The pitch of the teeth can vary. Preferably, the bearing groove is roll formed simultaneously with the teeth of the worm gear since the centroid of the enveloped teeth must be located with the gear center line.

Abstract: Helical or spur gear drive comprising a driven gear and driving gear wherein the driving gear has double crowned teeth defined as (i) an envelope to a family of surfaces generated by a skew or straight rack-cutter having a parabolic tooth profile in normal section and then (ii) as an envelope to a family of tool surfaces that are generated while the tool performs a plunging motion with respect to the driving gear in the direction of the shortest distance between the axes of rotation of the tool and the driving gear and tool plunging motion is varied by a parabolic function, whose variable is displacement of the tool in a direction parallel to the rotational axis of the driving gear. The driven gear has a tooth surface defined as the envelope to a family of surfaces generated by a rack-cutter which surface is parabolic cylinder or a plane.

Abstract: The invention relates to an adjustment device for motor vehicle seats which contains a gearing part which meshes with a gearing member to limit backlash, the gearing part is formed by a main part consisting of a main gearing and a compensation part with an elastic member arrange between the parts. A swiveling axis connects the parts. The degree of backlash of the two parts is restricted to a circular movement based on the connection through the swiveling axis.

Abstract: The present invention relates to a variable tooth worm of worm gear sets used for a gear transmission mechanism. It comprises a shaft body with thread teeth. Its tip surface is a cylinder or a crowning surface, and the reference circle of the tooth flank is a revolution of a curved line. The worm product is made with variable tooth thickness and variable tooth height. During the meshing period, its loading capacity and transmission efficiency are increased and the transmission performance approaches a more ideal state because it has a greater number of simultaneously-meshing teeth than a cylindrical worm and also gradually gets into and out of mesh. It has a lower number of simultaneously-meshing teeth than a toroidal worm during the transmission period so that it has the advantages of lower heat value, lower oil-agitating loss, lower requirements for center distance and adjustment of axial position, easier manufacture as well as better economy.

Abstract: Zero clearance screw rotor profiles are modified by determining clearance requirements at spaced points on the profiles and varying the clearance distribution between adjacent points using a non-linear distribution. Additionally, when the clearances are put in the rotors, zero clearance is maintained between the rotors in the contact band which is maintained near the pitch circle.

Abstract: A worm/worm gear transmission, particularly for use in a helicopter, and which includes an enveloping-type worm gear (3) having less than 24 teeth which are generated by an enveloping thread (1). The angle of one revolution of the thread has more than 15 degree. Different profiles of the worm gear are generated by a modified worm thread (9).

Abstract: A hybrid gear drive suitable for the transformation of motion and power between an involute worm and a face gear wherein the axis of the face gear and the worm may be crossed or intersected. The gear drive includes a multi-thread involute worm in meshing engagement with a face gear having helical teeth. The multi-thread involute worm threads each have a driving surface and a coasting surface formed in the profiles of the involutes of a pair of base circles having different radii. The gear drive allows practical gear ratios up to about ten for high speed, high load applications such as helicopter or automobile gearboxes.

Abstract: A drive axle assembly for a vehicle receives input torque from an engine via an input shaft. The input shaft drives a worm which in turn drives a worm gear. The worm gear includes teeth which engage and drive an axle shaft which in turn drives a vehicle wheel. The teeth of the worm gear are defined by a tooth profile which has two pressure angles, one on each side of the tooth. The worm includes a thread with a thread profile that also has two pressure angles, one on each side of the thread. One of the pressure angles on the thread of the worm is greater than its other pressure angle and one of the pressure angles on the worm gear teeth is greater than its other pressure angle.

Abstract: An improved sliding feed mechanism having a worm gear is disclosed can prevent a locking state from occurring between the worm and the worm wheel. The sliding feed mechanism includes a motor having a rotational shaft with an output end, a worm fixedly mounted to the rotational shaft and formed with a left-hand thread, a worm wheel which meshes with the worm, a driven member which is adapted to slidably move according to the rotation of the worm wheel. In this connection, the lead angle of the worm wheel is set so as to be larger than the lead angle of the worm, and the motor is mounted so that the output end of the rotational shaft is upwardly tilted so as to provide a proper engagement between the worm and the worm wheel having said lead angle.

Abstract: A drive for adjusting parts of seating and reclining furniture, preferably for adjustable chairs, consisting of a basic housing for accepting a mechanism for driving a spindle fixed in position in the basic housing in a rotating manner, and a motor flanged to the side of the basic housing and connected to the mechanism, an accepting device for connection to a holding device and an adjuster for adjusting the movable part of the seating or reclining furniture being provided on the basic housing.

Abstract: A reduction gear with two reduction stages including a first reduction stage consisting of a wheel and worm screw system. The system has a screw and a first wheel. A second stage includes a pinion meshing with a second toothed wheel. The wheel of the wheel and worm screw system includes two lateral parts spaced axially and equipped with teeth adapted to mate with the thread of the screw. A center part is located between the lateral parts, and includes teeth with an outside diameter less than the diameter of the teeth of the first wheel, this center part forming the pinion of the second reduction stage.

Abstract: This invention deals with a system and method for manufacturing a drive gear having a plurality of teeth in cross section where the teeth are situated on a drive shaft in a substantially parallel manner. The drive gear is characterized in that the teeth are substantially parallel to each other and contact mating driven teeth at points which define an arc which is not concentric about an axis of the driven gear. The drive gear is characterized in that it has multi-tooth contact points which do not contact the teeth of the mating gear at exactly the same contact point on the mating teeth, thereby lengthening the life of the driven gear as well as distributing the torque load to a plurality of teeth. A method and procedure for generating a drive gear having the features of the present invention is also disclosed.

Abstract: An apparatus for forging a ring gear having inner and outer helical gears formed with a predetermined phase relation therebetween is described. The apparatus is composed of a fixed outer die, a movable inner die, a mandrel carrying the inner die on its top and a knockout cylinder for ejecting a ring gear from dies after the forging process is completed. A material to be forged is charged in a space defined between the outer and inner dies and forged into the helical ring gear. The forged ring gear is first ejected from the outer die by pushing up the knockout cylinder and the mandrel while rotating the mandrel according to a lead of the helical gear of the outer die. Then, the forged ring gear is ejected from the inner die by further pushing up the knockout cylinder while rotating the knockout cylinder according to a lead of the helical gear of the inner die. In this manner the helical ring gear can be ejected smoothly from both outer and inner dies.

Abstract: The present invention is a ball worm and worm gear device which is a ball worm structure consisting of an arbor, a helix body and a housing where the said helix body further consists of a back-flow socket pipe that encase the arbor and a helical socket pipe that further encase the said back-flow socket pipe; Both the two socket pipes possess a back-flow channel and a helical channel respectively, having helical shapes but in opposite directions with their inlets and outlets connected each other, to form inner and outer channels of the helix body; These channels contain many balls which are constrained in the channels of the helix body to keep them from dropping off by encasing the housing around the helix body.

Abstract: Since the true power density of gearing is a function of the dynamic load, maximization of this critical performance property can be achieved only if both the static component and the dynamic increment of load are minimized. The invention discloses how these two objectives may be achieved in the same gear set. Both static and dynamic tooth stresses are minimized by forming the gears to have an optimum load distribution, a feature realized by using a new type of modification that minimizes the tooth surface relief area. The second requirement, of minimizing the dynamic increment, is accomplished in helical and spiral bevel gearing by proportioning the teeth to have a fully elastic "self-complementary" tooth pair stiffness curve, which gives a mesh stiffness characteristic that remains substantially constant throughout the entire tooth pair engagement angle at all loads and all speeds.

Abstract: A steering gear apparatus of the rack-and-pinion type including a pinion formed with helical teeth and a rack member formed with helical teeth which are brought into meshing engagement with the helical teeth of the pinion in such a manner that a steering effort is applied to the meshed portion of the helical teeth of the pinion and rack member at a predetermined angle relative to an axis line of the rack member, the rack member being resiliently biased toward the pinion, wherein the helical teeth of the pinion or the rack member each are formed with a tip portion to be brought into engagement with each root of the helical teeth of the rack member or the pinion.

Abstract: In a screw fluid machine including male and female rotors which are engaged with each other, a casing for accommodating both the male and female rotors, fluid working rooms which are formed by the male and female rotors and the casing, and fluid inlet and outlet ports which are provided in the casing so as to intercommunicate with one end portion and the other end portion of the working rooms, the helix angle of the screw gear constituting each of the male and female rotors is set to be continuously varied in a helix advance direction. Further, the screw gear is designed so that the peripheral length of a pitch cylinder in a helix advance direction on a development of a tooth-trace rolling curve on the pitch cylinder of the screw gear can be expressed by a substantially monotonically increasing function.

Abstract: A worm type reduction gear mechanism includes a worm, a multiplicity of balls, a ball receiving outer cylinder, a body casing and a worm wheel. A worm shaft is formed with at least one helical ball race and therein with a ball circulation passage extending therethrough and communicating with the ball race to form a circulation circuit. The balls are arrayed in the ball race and the ball circulation passage of the worm shaft and are allowed to run therein and circulate therethrough. The ball receiving outer cylinder is formed with meshing holes and fits the worm rotatably so that the balls may contact with the inner face of the ball receiving outer cylinder. The worm wheel is rotatably supported in the body casing and formed in its circumference with ball meshing teeth which are cut at the pitch or lead interval of the ball race. The balls of the worm are arranged so as to mesh with the ball meshing teeth of the worm wheel in the meshing holes of the ball receiving outer cylinder thereby to transmit the power.

Abstract: There is disclosed a globoid worm gear generating method in which the surface of a globoid worm generating tool is defined as the tooth surface of an intermediate gear by an inverted conical surface whose semivertical angle .gamma. is 90.degree.<.gamma.<180.degree., a relational movement similar to that of a globoid worm wheel is given to the tool so as to generate a globoid worm, and the worm wheel is generated by a wheel generating tool having a contour wholly or partially similar to that of the globoid worm, or in which the surfaces of a globoid worm generating tool are defined wholly or partially by two inverted conical surfaces whose semivertical angles .gamma. are 90.degree.<.gamma.<180.degree., and the major axes as well as bottoms of the two inverted conical surfaces are coincident with each other so that both tooth surfaces of a worm may be simultaneously generated. By this method of the invention, the globoid worm gears can be generated within a short period of time.

Abstract: An apparatus is responsive to a reaction force of intermeshing gear members that transmit force through an angle. The gear members include an elongated enveloped worm with a longitudinally extending axis of rotation and an output gear with an axis of rotation offset from and perpendicular to the longitudinally extending axis of the worm gear. The worm gear is movable axially in response to a predetermined reaction force or predetermined torque force. At least one biasing member is disposed adjacent one end of the worm gear, and preferably both ends of the worm gear, for centering the worm gear with respect to the output gear when subjected to a force below the predetermined reaction force or predetermined torque force.