Abstract: A gear assembly includes a first gear including first set of teeth and a first addendum circle, and a second gear having a second set of teeth meshing with the first set of teeth, The shape of the addendum flank of each first tooth and the shape of the addendum flank of each corresponding second tooth are defined by a curve of congruency which passes between the addendum circles and extends between the point of intersection of the addendum circles and the pitch point of the gears.

Abstract: A planet gear includes a toothed portion having a bore extending axially therethrough, a hub disposed within the bore such that an annular space is defined between the hub and the toothed portion, and an elastomeric element injection-molded into the annular space. The toothed portion includes a first groove circumferentially disposed in an inner surface of the toothed portion, and the hub includes a second groove circumferentially disposed in a peripheral surface of the hub. The grooves provide surfaces upon which the injection-molded elastomer can set. Holes may be disposed axially within the elastomeric element to decrease the spring rate of the elastomer, thereby providing additional radial compliancy to the planet gear. A method for manufacturing the gear includes disposing the hub within the bore of the toothed portion, injecting the elastomer in the annulus defined by the hub disposed within the bore, and curing the injected elastomer.

Abstract: A transfer ring (10) for a continously variable transmission. The transfer ring (10) includes an inner ring (12), an outer ring (18) and a spacer ring (24). The inner, outer and spacer rings are substantially coaxial with a transfer ring (10) axis. The spacer ring (24) is disposed radially between the inner and outer rings. The inner and outer rings are secured to the spacer ring (24) to substantially prevent relative movement therebetween. The spacer ring (24) has non-overlapping radially inwardly (26) and radially outwardly (27) facing slots extending respectively into inner and outer circumferences thereof. Laminar segments (42) are mounted in each of the slots and are slidably displaceable in a direction parallel to the transfer ring axis (22). The segments (42) are generally radially aligned with the transfer ring axis (22) and have upper (44) and lower (45) tabs straddling the spacer ring (24) to limit the distance which the segments (42) may be slidably displaced.

Abstract: A gear made of a resin includes a substantially cylindrical rim having a plurality of teeth formed around an outer periphery thereof, a boss formed about a rotational center of the rim, and a web connecting the boss and the rim to each other. At least one groove is defined along outer surface of each tooth to divide the tooth in a widthwise direction of the tooth. As a result, a portion of the gear, in which the grooves are defined, is deformed in a reduced amount, leading to a reduced amount of deformation such as a warpage or sink in the entire gear, thereby providing an enhancement in tooth flank accuracy. Since the grooves are defined along the outer surfaces of the teeth, a lubricant such as grease can be supplied effectively to tooth flanks by previously applying the lubricant in the grooves.

Abstract: A variable gear assembly has a cam gear with a plurality of teeth of varying size and configuration, and a rotatably mounted roller gear has a plurality of rollers for meshing engagement with the teeth. The distance of each roller from the rotation axis and the angles between adjacent rollers are predetermined such that, at any time during a rotation cycle, two rollers engage at least one currently active tooth. The assembly provides a variable gear ratio.

Abstract: The meshing of the rigid internal gear and the cup-shaped flexible external gear of a flexible meshing type gear device is simulated with racks, similarity transformation is effected on the composite curve consisting of the envelope obtained by axially projecting the movement loci of the rack teeth relative to each other from the tooth trace opening portion to the tooth trace inner extremity in sections perpendicular to the axis and the movement locus in the vicinity of the tooth trace inner extremity, and the resulting curve is adopted as the basic addendum profile of the external teeth and the internal teeth.

Abstract: A shaft/hub unit having a toothing assembly for transmitting torque, comprising a shaft (1) with shaft toothing (5) and a hub (2) with hub toothing (7), which sets of toothing engage one another, with torque being introduced by a shaft shank (4) at whose end there is provided the shaft toothing (5) and with the tooth profile of the shaft toothing (5), in the longitudinal direction, following a variable course, wherein the shaft toothing (5) comprises a major diameter which, in the longitudinal direction, follows a constant course and wherein the hub toothing (7) comprises a base diameter which, in the longitudinal direction, follows a constant course, wherein the toothing assembly comprises at least two axially extending portions (9, 10) in which each base diameter of the shaft toothing (5) follows a constant course and in which each major diameter of the hub toothing (7) follows a constant course, and wherein, of the each two adjoining portions, the portion facing the shaft shank (4) comprises the greater ba

Abstract: A rigid internal gear of a wave gear drive is comprise by a tooth-formed member having inner teeth and a circular gear body member, these two members being integrally connected with each other. The tooth-formed member is made of ferrous or copper material having a high strength and wear resistance, while the gear body member is made of lightweight material such as aluminum alloy and the like. These members are connected integrally with each other in a manner that one of these members is formed with baffle means and the other member is made by enveloped casting, or that the member having baffle means is pressed into the other member. These members are therefore surely connected with each other, so that a high torque can be transferred between these members. Also, the lightweight of the rigid internal gear can be achieved without deteriorating strength, wear resistance or the like thereof.

Abstract: A clockwork wheel (1) including a plate (3) provided with a first series of peripheral teeth (4) and a second series of teeth (5) arranged at right angles to the plate is manufactured in a strip of steel suitable for stamping and by means of a progressive forging die. In order to form the second series of teeth (5), a die perforated with a plurality of openings arranged in a circle is applied onto one face of the strip, and the flat face of a cylinder is pressed onto the other face of the strip to cause the steel to flow inside the openings of the die. The clockwork wheel is used as a setting wheel in a time or date setting mechanism.

Abstract: A sealed-type wave gear device 1 has a sealed space 13 formed by a device housing 2, first and second end plates 3 and 4 placed in openings at both the ends thereof, a hollow Input shaft 5, and first to fourth seals (8, 9, 11, 12) for sealing these members. A flat wave gear mechanism 20 is accommodated in the sealed space 13, which comprises a rigid internal gear 210, a silk-hat-shaped flexible external gear 220 inside the rigid internal gear 210, and a wave generator 230 fixed inside the flexible external gear 220. A lubricant in the wave gear mechanism 20 is completely prevented from leaking outside. Only the device housing 2, the first and second end plates 3 and 4, and both the ends of the input shaft 5 which are exposed outside need to be protected from rusting. The wave gear device 1 is suitable for being used as a speed reduction unit of a driving mechanism employed in a clean room.

Abstract: A continuously variable transmission (10) having input (12) and output (14) gearsets each having a pair of bevelled gears (16) rotatable about generally coplanar respective axes of rotation (22) and with the two bevelled faces (24) in a spaced-apart parallel relationship. The input (12) and output (14) gearsets are mounted opposite one another with the bevelled faces (24) aligned. A restorably deformable transfer ring is mounted between the input and output gearsets and a portion of the transfer ring (28) is captured between opposed teeth (24) of the bevelled gears (16). The transfer ring (28) is laterally moveable relative to the input (12) and output (14) gearsets.

Abstract: A pinion (7A) of a starter motor for an internal combustion engine, which pinion has an outer peripheral surface formed with gear teeth (7G) and an inner peripheral surface snugly fit with a bearing (8) so that the pinion can slideably move along an output shaft (6) of the starter motor through the medium of the bearing (8). The internal combustion engine is started by the starter motor through a ring gear of the engine which gear is caused to mesh with the gear teeth of the pinion upon starting of the engine. An inner diameter of a tip end portion (7a) of the pinion at which the pinion is brought into contact with the ring gear upon meshing therewith is so dimensioned as to lie between an inner diameter and an outer diameter of the bearing (8) in order to increase the strength of the pinion.

Abstract: A high addendum tooth for a spur gear that prevents interference upon engagement with other high addendum gear teeth when the engaging gears are not perfectly aligned. The gear tooth design is divided into two portions along the face width of the tooth. The first portion is located at the first end of the tooth and involves having a high tooth height. The sidewall or face surface of this first portion may be involute, flat, or some other profile. The second portion of the gear tooth is situated along the remainder of the length of the tooth extending from the first portion to the second end. The second portion does not have a high tooth height. Instead, the top of the second portion of the tooth is cut and ground to have a flat surface. The second portion is proportionally much longer and occupies a much greater portion of the face width than the first portion.

Abstract: A flexible meshing type gear device 1 has an internal gear 2 having internal teeth 21, a flexible external gear 3 having external teeth 31, and a wave generator 4. Only the internal teeth 21 of the internal gear 2 are formed thereon with a metal plated coating 21a. Further, a tooth profile 211 of the internal teeth 21 of the rigid internal gear 2 before metal plating is modified from a desired tooth profile of the internal teeth so that a tooth profile 212 defined by a surface of the internal teeth 21 after metal plating corresponds substantially to the desired tooth profile of the internal teeth for assuring a proper meshing between the internal and external gears. Accordingly, a flexible meshing type gear device having a high wear resistance can be realized while maintaining a high fatigue strength of the external gear and a proper meshing between gears.

Abstract: A bevel gear in which the sizing can be easily effected without degrading the quality of the gear. In a sintered or forged gear having a toothed portion (1) formed on an axial end face thereof, a notched groove (4) is formed in and across an outer circumferential surface of the gear in an axial direction. The construction of the notched groove (4) is specified so that its quality is kept.

Abstract: A gear wheel is formed from a pressed and sintered powder metal blank in which the metal powder comprises an admixture of iron powder and at least one alloying addition and the gear wheel is surface hardened by applying densifying pressure only to the tooth root regions or only to the tooth flank regions in order to establish densification in the range of 90 to 100 per cent of full theoretical density to a depth of at least 380 and up to about 1,000 microns.

Abstract: A method for the manufacture of a machine part with external toothing from a circular sheet metal blank. According to this method the blank is fixed between a tool and a tail stock. Subsequently the circumferential edge of the circular sheet metal blank is bent by a first metal working roll towards the side of the tool by an angle of more than 180.degree. to form a curl. This curl is radially flattened with a second metal working roll. Subsequently the flattened curl is pressed against the tool with a gear cutting roll and shaped to form an external tooth system.

Abstract: A gear wheel is formed from a pressed and sintered powder metal blank in which the metal powder comprises an admixture of iron powder and at least one alloying addition and the gear wheel is surface hardened by densifying at least the tooth root and flank regions to establish densification in the range of 90 to 100 percent of full theoretical density to a depth of at least 380 and up to about 1,000 microns.

Abstract: A method is provided for forming a one-piece sheet metal toothed wheel including a central sheet metal wall of predetermined thickness and a series of integral teeth on the periphery of the central wall.The method comprises a combination of steps the initial one is cold-forming a circular piece of sheet metal into a preform having an outer annular section of generally uniform cross-sectional configuration and an integral sheet metal central wall.The next step is rotating (1) the rotary holding unit with the preform secured thereto about the preform axis, and (2) the tooth-forming tool unit about the rotational axis thereof in a predetermined rotational relation wherein the axes are parallel and the rotational speeds are synchronized.

Abstract: A toothed wheel for use in automobiles and a method for its manufacture are disclosed. The toothed gear is of a dish-shaped disk having a thickened peripheral edge portion in an outer and/or inner side of which gear teeth are shaped, at least the surface area of the gear teeth being of a martensite structure, the disk being made of a steel comprising a ferrite-cementite-graphite structure in which 50% or more of cementite has been changed to graphite, the steel composition of the disk consisting essentially of, by weight %:C: 0.20-0.70%, Si: 0.05-1.00%, Mn: 0.05-0.50%, sol. Al: 0.01-1.00%, N: 0.002-0.010%, B: 0.0003-0.0050%, Ca: 0-0.01%, Cu: 0-1.00%, Ni: 0-2.00%,and a balance of Fe and incidental impurities in which the content of P is restricted to not larger than 0.020% and the content of S is restricted to not larger than 0.010%.

Abstract: A transmission is provided wherein selected configurational parameters of interacting spur gearing are modified to abate the vibration levels thereof due to the effects of differential thermal expansion of the gearbox housing. The chordal addenda of the gear teeth of the interacting spur gearing are extended by a predetermined amount, based upon the computed relative radial displacement of the centerlines thereof due to the differential thermal expansion effects, to provide modified interacting spur gearing having increased outside diameters. Such modified spur gearing provides an effective centerline spacing for the transmission such that the interacting spur gearing thereof has an operating contact ratio greater than the design contact ratio at engine start up.

Abstract: A method of forming a one-piece sheet metal toothed wheel comprising the steps of rotating (1) a rotary holding unit with the preform secured thereto about the preform axis and an inner portion of an outer annular section of the preform within a back-up space provided by the holding unit, and (2) a tooth-forming tool unit about the rotational axis thereof in a predetermined rotational relation wherein the axes are parallel and the rotational speeds are synchronized, and then while the rotary holding unit with the preform secured thereto and the tooth-forming tool unit are in the predetermined rotational relation affecting relative movement between the units and the axes thereof in a direction toward one another to engage the tooth-forming periphery fo the tooth-forming tool unit in cooperation metal-deforming relation with the outer portion of the outer annular section inwardly of the exterior periphery the preform until the sheet metal of the outer portion of the annular section is cold-formed into the serie

Abstract: Cast iron gears, such as those used as cam gears on engines and as used for fuel injection gear pumps, which have a hub and a rim that are thick in comparison to the relatively thin web used to interconnect the hub with the rim and a process by which such iron gears can be cast, especially in a vertical orientation. To eliminate porosity problems, single flow channel of substantial thickness is incorporated into the mold cavity which forms a flow rib that runs radially between the hub and rim of the gear being formed. To compensate for both the added weight of the rib that is produced on the web of the resultant gear, as well as to counterbalance the effect caused by the presence of a single rib, at least one opening is formed in the web at each side of the rib.

Abstract: A cold-formed gear made from a single circular sheet of sheet metal. The gear is formed to have a central wall and a series of gear teeth surrounding the central wall. The teeth are formed in a outer annular section of the steel sheet by rolling contact with a cold-forming gear member. Extending from the outer annular section is a radial surface that supports the gear on a preform unit and then can be formed into a pulse ring for the gear.

Abstract: The peripheral teeth of a gear body are made of alloy tool steel and coated with a manganese-phosphate-treated layer and then with a solid lubricating film. The alloy tool steel of which the teeth of the gear body cooperates with the manganese phosphate layer to act on the solid lubricating film. The taking-in force of the solid lubricating film can be thus increased at the surface thereof. The bonding strength of the solid lubricating film can be increased as well. This can prevent the solid lubricating films on teeth of the two gear bodies engaged from being separated from each other.

Abstract: A method of forming a toothed wheel comprising the steps of cold-forming a circular piece of sheet metal of predetermined thickness into a preform, rotating (1) a rotary holding unit with the preform secured thereto about the preform axis and with a control surface of the holding unit underlying at least a portion of an annular section of the preform and (2) a tooth-forming tool unit in a predetermined rotational relation wherein the axes of rotation are parallel and the rotational speeds are synchronized, and while in the predetermined rotational relation affecting a relative movement between the units and the axes thereof in a direction toward one another to engage a tooth-forming periphery of the tooth-forming tool unit in cooperating metal-deforming relation with the annular section inwardly of the exterior periphery thereof until the sheet metal of the annular section is cold-formed into the series of teeth, the peripheries of which are cold-formed by rolling contact with the tooth-forming periphery of t

Abstract: A cold-formed ring gear is made from a relatively thin circular metal body, the outer peripheral edge of which is preformed to define a radially inwardly opening U-shaped channel in the outer surface of which the gear tooth pattern is subsequentially cold rolled using a known method and tooling. The unique preformed plate body obviates the need for a grooved interior supporting mandrel and results in a toothed rim of substantially enhanced strength and rigidity. The gear tooth pattern which is cold rolled in the preform provides tooth faces of substantially enhanced width and depth relative to the width and thickness of the base material from which they are formed. All of the other known advantages of cold formed teeth, as opposed to conventional cut teeth, are also realized.

Abstract: In a planetary gear apparatus according to the present invention, a first shaft and a second shaft are rotatably supported in a casing. A sun gear is fixed to the first shaft. A fixed internal gear located in the casing is arranged concentric with the sun gear. A rotary internal gear connected to the second shaft is arranged coaxially with the fixed internal gear, and the rotary internal gear has the difference M in the number of teeth with respect to the number of the teeth of the fixed internal gear. N (M.noteq.N, N.noteq.1) planet gears, which revolve around the sun gear, are disposed at equal intervals circumferentially. Each planet gear has a first portion, engaged with the fixed internal gear, and a second portion, engaged with the rotary internal gear. Either one of the first and second portions of the planet gear is engaged with the sun gear. When the number of planet gears is designated circumferentially by i=1, 2, . . .

Abstract: A digital clock construction, a pinion gear therefor and methods of making the same are provided, the clock construction comprising a frame, first and second time indicating drums each being rotatably carried by the frame, and a pinion gear rotatably carried by the frame and having driving gear teeth disposed in meshing relation with an annular internal gear of the second drum whereby rotation of the pinion gear causes rotation of the second drum, the pinion gear having locking teeth extending from certain of the driving teeth thereof, the first drum having an annular internal locking surface that is adapted to slide against a pair of locking teeth to hold the pinion gear from rotation thereof while the first drum is being rotated through certain timed increments of movement thereof, the first drum having a pair of kicker teeth for meshing with the driving teeth of the pinion gear to rotate the pinion gear when the first drum is being rotated through a particular one of the timed increments of movement thereo

Abstract: Face-gear transmissions have been used hitherto only for secondary applications, with little running hours and low loads. They form a type of underdeveloped angle transmissions. When analyzing said underdevelopment, it was surprisingly found that well-known gear theory had not been applied correctly. Especially the teeth-tip-height can be increased considerably in the region where the face-gear teeth have increased pressure angles, resulting in considerably increased loading capacity and meshing quotient, all based on meshing cooperation with standard cylindrical gears with either straight (spur) or helical teeth. The angle between the transmission shafts may be 90.degree., less or over, the shafts may intersect or cross.

Abstract: A method and an apparatus for the chamfering of the axially facing ends of toothed cylindrical or conical workpieces in which a cutting tool arranged on a rocking lever is moved back and forth in response to the peripheral speed of the workpiece which constantly rotates about its axis. The cutting edge of the tool acts chip-removingly during each stroke that is directed onto or toward the axially facing surface of each tooth of the workpiece. The cutting edge moves along a circular segment path, the axis of which extends at least approximately parallel to a radial of the workpiece, which radial starts out from the workpiece axis and extends through the tooth which is to be worked or machined.

Abstract: A starter with a gear reduction mechanism including an internal ring gear formed of synthetic resin and a reinforcing member. The internal ring gear has a cylindrical portion and a toothed portion formed on an inner peripheral surface of the cylindrical portion. The reinforcing member is secured around an outer surface of the cylindrical portion.

Abstract: A spur gear system wherein each gear comprises two gear sections; gear te in the respective sections are staggered a one half tooth pitch distance. The effect is to achieve a relatively high contact ratio with relatively small diameter gears. Teeth on mating gears are of positive (convex) curvature and negative (concave) curvature to provide an enlarged contact area.

Abstract: A forged metal spur gear is configured with one lateral face extremity portion extended to the addendum circle of the gear teeth for proving increased load carrying capacity to a gear of a given size.

Abstract: A gear having a good balance of mechanical characteristics such as shock resistance, wear resistance, and flexible strength is molded from nylon resin containing 3-10 wt % of carbon fibers and 20-40 wt % of glass fibers.

Abstract: A sliding gear for a speed-changing transmission, idling on an output shaft, has a set of external running teeth in permanent mesh with a driving gear and a set of internal clutch teeth engageable with mating teeth on a coupling member carried by that shaft. The two sets of teeth have centerlines inclined to the axial direction by angles so related as to exert balanced axial forces upon the sliding gear in the engaged position of the latter. The clutch teeth have flanks diverging from their centerlines at small angles, in the direction of the engagement shift, to hold the sliding gear in contact with the coupling member.

Abstract: Gear for chain drives comprising a gear body of cast material having a hub section, a gear rim section with spur teeth, and a web section joining said hub and gear rim sections, and a ring plate of metal embedded in the web section, the outer edge of said plate being near the bottom of the areas between the spur teeth and having axial openings filled with casting material around its periphery, said ring plate having at its outer radial edge, radially outwardly directed projections, which are located in each case in a tooth, and which are embedded in the casting material of the gear body, said projections extending beyond the bottom of the spaces between adjacent spur teeth, and an axial opening formed in the ring plate adjacent each projection and radially below it.

Abstract: The invention discloses means to reduce the noise and vibration that result from gear transmission error produced by variations in the mesh stiffness at different phases of tooth engagement. A substantially constant mesh stiffness is achieved by proportioning the teeth and the field of contact so that the product of incremental tooth length and tooth load per unit length at a given torque load integrated over the field of contact does not vary significantly as the tooth contact lines move across the field. To minimize deviations from the mean mesh stiffness, the teeth are made as flexible as possible and the total contact ratio as large as possible.

Abstract: A motor-driven rotary actuator includes an electric drive motor adapted to be configured for providing one of a plurality of output torques. A power transmission is coupled to the drive motor and includes a rotatable output shaft and drive elements adapted to be formed of disparate materials selected for transmitting one of the output torques. An electric controller is coupled to the motor for providing rotation positioning control of the output shaft in response to digital command signals.

Abstract: A motor-driven rotary actuator includes an electric drive motor adapted to be configured for providing one of a plurality of output torques. A power transmission is coupled to the drive motor and includes a rotatable output shaft and drive elements adapted to be formed of disparate materials selected for transmitting one of the output torques. An electric controller is coupled to the motor for providing rotation positioning control of the output shaft in response to digital command signals.

Abstract: A self-aligning gear train of enhanced load transmitting capacity comprises a pair of cylindrical gear wheels having intermeshing teeth with concavo-convex side surfaces. The opposed, peripheral surfaces of the intermeshing cylindrical gear wheels are square providing increased surface contact between meshing gear teeth from the base to the edges of the teeth with the convex tooth surface of one gear engaging a concave tooth surface of the other gear to provide self alignment of one cylindrical wheel with the other.

Abstract: This invention relates to a starting motor with planetary gear reduction gears having a spur gear provided at the front end of the rotational shaft of the starting motor, an internal gear secured fixedly to the front end of the yoke of the motor, a planetary gear for engaging the spur gear with the internal gear, an output rotational shaft for transmitting the rotary force of the motor to the planetary gear, and a pair of collars provided on the internal gear at both ends of the teeth of the internal gear.

Abstract: A sprocket construction for a zero caternary chain. In a zero caternary chain, a tensioning system is utilized to prevent caternary or slack in the chain and as a result of the high degree of tensioning, the bushings of the chain ride against the roots of the sprocket teeth. To prevent erosion of the sprocket teeth and bushings, the root diameter is modified to provide an enlarged operating pitch diameter for a predetermined increase in pitch length of the link. The pitch line clearance is enlarged so that it is equal to 2% to 25% of the working pitch diameter and produces a pressure angle of 20.degree. to 40.degree..

Abstract: An improved non-metallic sprocket, such as the phenolic laminate type, one improvement consisting of sprocket teeth molded from continuous layers of material laminated in a corrugated, sprocket tooth forming construction about the periphery of the sprocket. Another improvement consists of the inclusion of a non-metallic hub fashioned from a length of resin pre-impregnated material, in particular, fiberglass cloth, wound into a tube. During the molding of the sprocket the layers of material forming the tube are laminated into a solid hub.

Abstract: An improved drive mechanism for rotating a sweep arm in a storage structure that contains a free-flowing stored material. The inner end of the sweep arm is mounted on a turntable that is disposed in the inner end of a radially extending trough in the foundation of the storage structure. The turntable is provided with a pair of spaced, concentric, downwardly extending flanges, and a plurality of ribs connect the upper portions of the spaced flanges. The spaces between the ribs define upwardly diverging passages. A drive pin is positioned beneath each rib and extends between the spaced flanges. The teeth of a drive sprocket are engageable with the drive pins, and rotation of the sprocket acts to rotate the turntable and thus rotate the sweep arm around the structure to dislodge the stored material. As the drive sprocket is rotated, any stored material in the vicinity of the drive pins is extruded upwardly through the passages by the sprocket teeth to prevent possible jamming of the drive mechanism.

Abstract: A gear wheel is provided with a split damping ring on each side having a close fit with the inside of the rim of the gear wheel. The rings are anchored at points remote from their split ends to the web of the wheel. A tapered bolt and nut assembly cooperate to wedge the ringsagainst the gear rim. Elastomer type ring washers associated with such bolt and nut assembly are pinched tightly thereby to the gear rim.

Abstract: The present invention has for object a mechanism of transmission comprising two toothed wheels meshing with each other.

Abstract: A lifting apparatus wherein a cone rack mechanism having cone pieces interlocked to driving gears is driven by such driving gears, which are connected and controlled by a special friction clutch mechanism, a latch mechanism, and a centrifugal brake, for continuing the lifting and lowering of a body, such as a water gate.