Abstract: A roller device includes a motor and a speed reducer inside a cylindrical roller or arranged coaxially, and an electronic apparatus includes a printer using the roller device. This roller device comprises a motor (5) disposed on a cylindrical roller (2), a sun gear (7), planet gears (8), a first inner tooth gear (10) provided inside of the cylindrical roller (2), and a second inner tooth gear (11) provided inside of a bearing element (12). The rotation of the bearing element (12) is suppressed by a predetermined force. Thus the rotation of the motor (5) is decelerated, and the cylindrical roller is rotated at a reduced speed. By rotating the bearing element with a force greater than a predetermined force, the cylindrical roller can be rotated manually.

Abstract: A gear train has a sun gear with a tooth count e, n (where n is a natural number of 2 or more) planetary gears having a first gear part with a tooth count z1 meshing with the sun gear and a second gear part with a tooth count z2, a fixed internal tooth gear with a tooth count I1 meshing with the first gear part of the planetary gears, and a movable internal tooth gear with a tooth count I2 meshing with the second gear part of the planetary gears, where tooth counts e, z1, z2, I1 and I2 are each a multiple of n. Even if the gear form of each gear has a small module, a planetary gear train mechanism can be configured without raising operating or assembly problems, and it can be miniaturized more than conventional gear trains while still have a sufficient gear reduction ratio.

Abstract: An electronic drive unit assembly independently drives each drivable wheel on a heavy-duty vehicle. The drive unit assembly includes a spindle that defines an inner chamber and which is mounted to a vehicle structure. A wheel hub is mounted for rotation relative to the spindle. An electric motor is mounted within the inner chamber and has an output shaft that is operatively coupled to a reduction gear assembly that is used to drive the wheel hub. The reduction gear assembly includes an inner ring gear mounted to the spindle and an outer ring gear mounted to the wheel hub. An inner set of planet gears is in meshing engagement with the inner ring gear and an outer set of planet gears is in meshing engagement with the outer ring gear. A planetary spider assembly rigidly connects the inner and outer sets of planet gears. The inner planet gears have a different number of teeth than the outer planet gears to achieve the desired gear reduction.

Abstract: A hammer drill has a motor which drives an axially displaceable intermediate gear mounted in an intermediate gear arrangement. An impact mechanism is formed by including interacting impact cams between either the intermediate gear and the housing, or the motor armature shaft and the housing to generate a reciprocating motion on an output spindle or shaft. A spindle locking mechanism is included which causes an intermediate gear to be disengageable with respect to the output shaft, while still permitting the impact mechanism to be engaged. Such an arrangement allows the hammer drill to operate in a hammer-only or chipping mode.

Abstract: A mechanical paradox planetary speed reducer has an input shaft, a plurality of plantet gears, a pair of fixed internal sun gears, and a movable internal sun gear. The fixed internal sun gears are spaced from each other in the axial direction of the input shaft, and the movable internal sun gear is disposed between the fixed internal sun gears. The movable internal sun gear has outer flanges on opposite ends thereof and fitted over the ends of the fixed internal sun gears in sliding contact therewith, holding the movable internal sun gear and the fixed internal sun gears in concentric relation to each other.

Abstract: An electric drive axle for use in hybrid vehicles has an electric motor driving a compact gearbox. The gearbox includes a planetary reduction unit and a differential assembly. The planetary reduction unit has a sun gear driven by the electric motor, and compound planet gears supported from a planet carrier which have a first gear segment meshed with a fixed first ring gear and a second gear segment meshed with a second ring gear. The sun gear is also meshed with one of the first and second gear segments of the compound planet gears. The second ring gear drives the differential which transfer motive power to a pair of output shafts adapted for connection to one set of wheels. When used with a conventional engine-based powertrain for the other set of wheels, the electric drive axle establishes a four-wheel drive powertrain for the hybrid vehicle. The electric motor and gearbox are mounted in a common housing assembly to provide a compact drive axle assembly.

Abstract: An electric drive axle for use in hybrid vehicles has an electric motor driving a compact gearbox. The gearbox includes a planetary reduction unit and a differential assembly. The planetary reduction unit has a sun gear driven by the electric motor, and compound planet gears supported from a planet carrier which have a first gear segment meshed with a fixed first ring gear and a second gear segment meshed with a second ring gear. The sun gear is also meshed with one of the first and second gear segments of the compound planet gears. The second ring gear drives the differential which transfer motive power to a pair of output shafts adapted for connection to one set of wheels. When used with a conventional engine-based powertrain for the other set of wheels, the electric drive axle establishes a four-wheel drive powertrain for the hybrid vehicle. The electric motor and gearbox are mounted in a common housing assembly to provide a compact drive axle assembly.

Abstract: A planetary gear transmission apparatus includes a sun gear, a first inner gear ring, a second inner gear ring and a planetary gear set constitutes a plurality of planetary gears. The first inner gear ring has increased tooth space, increased tooth root and decreased tooth thickness. The second inner gear ring has decreased tooth space, decreased tooth root and increased tooth thickness. The first and second inner gear rings have substantially same size of tooth root circles. The planetary gear is cylindrical formed with an uniform diameter. The rotational contact surfaces between the components are curved plane contact. The apparatus may be made small size at a low cost and with no stress concentration. Friction loss is less. Transmission efficiency may be increased without overheating at high rotation speed.

Abstract: A mechanical paradox planetary speed reducer has an input shaft, a plurality of plantet gears, a pair of fixed internal sun gears, and a movable internal sun gear. The fixed internal sun gears are spaced from each other in the axial direction of the input shaft, and the movable internal sun gear is disposed between the fixed internal sun gears. The movable internal sun gear has outer flanges on opposite ends thereof and fitted over the ends of the fixed internal sun gears in sliding contact therewith, holding the movable internal sun gear and the fixed internal sun gears in concentric relation to each other.

Abstract: A wind-power plant with a rotor. The rotor's hub is accommodated in a roller bearing. The roller bearing is mounted on a support and connected to a planetary gear. The planetary gear comprises two stages, specifically an input stage and an output stage. The planetary gear's output shaft is coupled by way of a clutch to a generator. The roller bearing (3) has an inner ring (7) that is attached to and can be detached from both the hub (1) and the rotating part of the planetary gear. The generator (11) has a housing that is combined with and can be removed from the planetary gear to constitute a drive-train module. The module rests on the rotor support (4) and can be dynamically separated from the overall plant.

Abstract: The planetary gear according to the invention comprises a sun gear (2) connected to a driven central shaft (20), a ring gear (12), a group of first stepped planetary gears (8, 10) and a group of second stepped planetary gears (4, 6). The large step wheels (4) of the second stepped planetary gears engage the sun gear (2), the small step wheels (6) of the second stepped planetary gears simultaneously engage a pair of adjoining large step wheels (8) of the first stepped planetary gears and all small step wheels (10) of the first stepped planetary gears engage the ring gear (12). The gear allows for high transmission ratios having a small size and low inertia moment and offers excellent properties in relation to efficiency and transmission reliability.

Abstract: A planetary gear device (20) comprises a front-stage side planetary gear mechanism (21) and a rear-stage side planetary gear mechanism (23). The rear-stage side planetary gear mechanism (23) comprises an internal gear (25), a carrier (29) rotatably supported by a pair of main guide bearings (26,27) disposed on both sides of the internal gear (25), a plurality of planetary gears (31) rotatably supported on a plurality of planetary shafts (30) extending between a pair of carrier parts (28A,28B) of the carrier (29), a sun gear (33) formed on an outer circumferential surface of a pinion shaft extending in a direction of a device axial line (20a) to pass through the carrier (29), and an output shaft (34) connected to the carrier (29) and extending in the direction of the device axial line (20a).

Abstract: A driving unit (1), comprising: a motor (10), a driven shaft (2) driven by the motor, and a transmission device (20) coupled between the motor and the output shaft and having one input shaft (21) and two rotational output members (22) and (23), wherein the ratio of transmission from the input shaft (21) to the first rotational output member (22) differs from the ratio of transmission from the input shaft (21) to the second rotational output member (23). The first rotational output member (22) is coupled to the motor housing (11) via a slip coupling (30). A helical spring (60) arranged so as to be coaxial to the motor presses the first rotational output member (23) against the motor housing (11), wherein that helical spring (60) engages the motor housing (11) via a pressure ring (50). This pressure ring (50) has a helical channel (52) for receiving the helical spring (60). The pressure ring (50) is rotatable to enable setting the maximum value of the moment that can be supplied to the output shaft (2).

Abstract: A planetary gear (1) in the form of a Wolfrom gear with a high transmission ratio. Such gears are preferentially used in handling gear engineering. In order to reduce the number of components required and improve the overall efficiency of the planetary gear, the step wheels (4, 6) of the step planet wheels (5) or the hollow wheels (11, 12) are conically toothed and have opposite conical inclinations. The planet carrier (10) is floating, that is, without a separate bearing. The planetary gear is used especially in industrial robots.

Abstract: A drive train for transmitting torque produced by a motor to a load comprises a planetary gear arrangement mounted concentrically with respect to a tubular shaft. The planetary gear arrangement cooperates with a pair of driven gears which are also coaxial with the tubular shaft, the planetary gear arrangement and the pair of gears being located within an outer housing. The tubular shaft provides an unobstructed, large diameter passage through the drive train, the passage being available for the routing to a load connected to one of the driven gears of movable shafts, conduits or electrical conductors.

Abstract: A position detecting device includes a ring gear that is disposed on an outer side of an output shaft of a motor and rotates with the rotation of the output shaft, fixed contact terminals fixed to a cover plate, and a rotary contact terminal provided on a ring gear. As the ring gear rotates, the fixed contact terminals and the rotary contact terminal are brought into contact with each other, thereby detecting a rotational position of the output shaft. The position detecting device further includes a clutch mechanism for preventing the rotation of the ring gear by more than a predetermined degree while permitting the rotation of the output shaft of the motor in the state of contact. Hence, even if the output shaft of the motor is rotated sufficiently, this state of contact is maintained.

Abstract: An angular adjustment mechanism for adjusting the angular displacement of a seat back relative to a seat cushion has first and second internal toothed ring gears, the first and second ring gears being interconnected and adapted to be secured to the seat back, a third internally toothed ring gear being mounted intermediate of and rotatable relative to the first and second ring gears, said third ring gear being adapted to be secured to the seat cushion frame, the first, second and third ring gears being of the same diameter, the first and second ring gears having equal numbers of teeth and the third ring gear having a different number of teeth; a control gear being located axially within the first, second and third ring gears, and at least one planet gear being located in meshing engagement with the control gear and with the first, second and third ring gears, a tooth on each of the first and second ring gears being aligned with a tooth on the third ring gear at the point of meshing of the planet gear.

Abstract: A drive train for transmitting torque produced by a load comprises a planetary gear arrangement mounted concentrically with respect to a tubular shaft. The planetary gear arrangement cooperates with a pair of driven gears which are also coaxial with the tubular shaft, the planetary gear arrangement and the pair of gears being located within an outer housing. The tubular shaft provides an unobstructed, large diameter passage through the drive train, the passage being available for the routing to a load connected to one of the driven gears of movable shafts, conduits or electrical conductors.

Abstract: An epicyclic roller gear (100) has two rings (1 and 4) provided with an inner profile. One ring (1) is fixed and the other ring (4) is parallel or coaxial to the first ring (1) and is rotatably mounted with respect thereto. The number of teeth on the two rings is different. Both rings (1 and 4) have at least two parallel internal profiles (1.1, 1.2, 4.1 and 4.2) which are offset in the circumferential direction by a fraction of the pitch of the profile or teeth. When each ring has two mutually offset internal profiles, they are mutually offset by half the pitch of the teeth, so that in this case the gaps of the one tooth system are occupied by the teeth of the second, adjacent tooth system. This results in a high contact ratio with the corresponding complementary profiles of a rolling element, preferably a roller carrier (5) with rotatable rollers which roll in the gaps between the teeth of the internal profiles.

Abstract: The object of the present invention is to provide a speed changer having a simple structure and great speed changing ratio. In the speed changer of the present invention, a movable gear section has a first pinion gear and a second pinion gear, which are coaxially integrated and which are capable of spinning about their common axis. A motor moves the movable gear section on a circular orbit. A fixed ring gear fixedly encompasses the circular orbit, the fixed ring gear has a first inner gear section, which is formed on an inner circumferential face, wherein the first pinion gear is capable of engaging with the first inner gear section and rolling thereon. An output ring gear rotatably encompasses the circular orbit, the output ring gear is coaxial to the fixed ring gear, the output ring gear has a second inner gear section, which is formed on an inner circumferential face, wherein the second pinion gear is capable of engaging with the second inner gear section and rolling thereon.

Abstract: The invention concerns a setting device for adjustment of the angular relative position of two components that are pivotable with respect to one another by means of planet wheels distributed along fear tracks formed is said pivotable components and arranged to roll on said gear tracks, the engagement of the teeth of said planet wheels being so adapted that upon the rolling of said planet wheels on said tracks the two pivotable components will be imparted a relative turning movement. In accordance with the invention the planet wheels are supported so as to be allowed radial movement and means are provided to urge the planet wheels radially into contact with the gear tracks.

Abstract: A jam-tolerant rotary actuator 70 through the incorporation of shear lugs 84,92 formed on an inner input sun gear member 82 and on an inner movable output ring gear member 90 which correspond to recesses 88,96 formed in an outer input sun gear member 86 and in an outer movable output ring gear member 94, respectively, where, upon application of a maximum torque to either the inner input sun gear member 82 or the outer movable output ring gear member 94, the shear lugs 84,92 will shear thereby allowing the inner input sun gear member 82 to be movable independent of the outer input sun gear member 86 or the outer movable output ring gear member 94 to be movable independent of the inner movable output ring gear member 90, respectively.

Abstract: The invention concerns a device, preferably arranged for setting inclination of a backrest of a seat, primarily a vehicle seat, comprising components which are interconnected in pairs for mutual rotational movement and which are arranged to be associated with the back rest and the seat face, respectively, of the seat. Each component of the pair is formed with a gear rim, the rims positioned adjacent one another in mutual concentric relationship, with the rim teeth meshing with the teeth of a number of planet wheel pairs, the latter rolling in mesh with the associated gear rim, thus causing the two gear rims and their associated component of the joint to turn relatively to one another, and consequently the back rest of the seat to pivot with respect to the seat part.

Abstract: A carrier-less, anti-backlash planetary gear system that has an input sun gear, a force-balancing and planet-alignment "speeder" gear above the sun gear, a split ring gear that has a fixed lower ring gear coaxial with the sun gear and a rotating upper ring gear also coaxial with the sun gear. A preload bolt is used for securing the split ring gears together. Within the split ring gear is an even number of planet gears between the split ring gear and the sun gear. Each planet gear consists of an upper planet gear, and lower planet gear with the upper and lower planet gears splined together and pushed apart by a spring which causes separation and relative twist between the upper and lower planet gears. The lower planet gear meshes with the input sun gear and the fixed ring gear while the upper planet gear is driven by the lower planet gear and meshes with the rotating ring gear.

Abstract: A planetary reduction gear comprising pairs of partial planetary gears, two partial internal gears and a sun gear or comprising pairs of partial planetary gears, two partial sun gears and an internal gear in which partial planetary gears mesh with partial internal gears or with partial sun gears independently. One of the partial gears is fixed to the input shaft or to the casing. The other partial gear is loosely connected to the input shaft or to the casing by a spiral coupling which allows the partial gear to move in spiral direction. A pressing means pushes the partial gear in the axial direction. Force of the pressing means moves the partial gear in the spiral direction. The partial gear slightly rotates relatively to the other partial gear. Relative rotation of the partial gears cancels backlashes. In the case of helical gears, the spiral coupling can be replaced by an axial coupling.

Abstract: Door operator for commercial and domestic use with swing-mounted doors are disclosed. Each operator employs a variable-speed d.c. motor as prime mover, and a vertically oriented door-driving operator output shaft journalled in a transmission having a compact transmission housing which includes shock mounts for mounting of the transmission housing and operator within structure associated with the door. The transmission provides speed reduction coupling of the motor drive shaft to the operator output shaft with substantially right-angled relationship between their axes of rotation. The transmission includes a drive gear, to which the motor drive shaft is coupled by miter gear arrangement of different types, with the drive gear in coaxial relation with the operator output shaft but independently rotatable about it.

Abstract: A miniature reduction gear includes a sun gear, a fixed inner gear and a movable inner gear and at least one planetary gear. The planetary gear is formed of three stages of outer teeth. Each outer tooth stage separately engages one of a sun gear, fixed inner gear and movable inner gear. The sun gear provides an input to the miniature reduction gear and the movable inner gear provides an output. The number of teeth of the planetary gear which engage with the sun gear is greater than the number of teeth which engage with either of the fixed inner gear or movable inner gear.

Abstract: The problem of reducing the number of parts and reducing the manufacturing costs of actuator arms in a power driven actuator system of a type including a planetary gear train (42), is solved by providing an elongate torque shaft (40) coupled to the gear train. A pair of ring gears (56a, 56b) are spaced longitudinally of the torque shaft (40) as part of the planetary gear train (42). Each ring gear (56a, 56b) has identical actuator arm mounting portions (64) facing in opposite axial directions of the torque shaft (40). A pair of asymmetrical actuator arms (16) project radially outwardly of the torque shaft. Each actuator arm has identical mounting portions (66) on opposite axial sides thereof complementary to the mounting portions (64) on either ring gear (56a, 56b) for interchangeably mounting either asymmetrical actuator arm on either ring gear to be driven thereby.

Abstract: A geared rotary actuator (1) including a compound input stage (3, 5) and a compound output stage (4, 6) with the input stage (3, 5) including a sun gear (24) with gear portions (24a, 24b) respectively meshing with a drive gear (23) and further gear (25). Input/output link members (28, 29) connect the input stage (3, 5) with planet gears (26, 27) of the output stage (4, 6) so as to provide uninterrupted controlled speed, torque and power delivery to an output (31, 32) and through shaft (S) of the geared rotary actuator (1) even upon an occurrence of a jam in the geared rotary actuator (1).

Abstract: A geared rotary actuator (1 or 1') and method of assembling the same, with the geared rotary actuator (1 or 1') including a plurality of one-piece planetary gears (12 or 12'), each including a first set of gear teeth (19) meshing with a sun gear (11), and at least two additional sets of gear teeth (17, 18 or 17') respectively forming an inboard set of gear teeth and an outboard set of gear teeth respectively adapted to mesh with sets of gear teeth (13 or 13', 14 or 14'), of outboard and inboard ring gears. At least one tooth of the sets of gears (17, 18, 19 or 17', 19') are axially aligned along a length of the one-piece planetary gears (12 or 12') so as to enable the inboard ring to be moved axially past the outboard set of gear teeth (17 or 17') to mesh with the inboard set of gear teeth (18 or 17').

Abstract: A reclining device for a vehicular seat with which position of a seat back is inclinably adjusted by rotating a rotation shaft. A control gear integral with the rotation shaft engages with planetary gears which are located around the rotation shaft. The planetary gears engage with both internal gears formed in base and arm frames in a manner to rotate the arm frame relative to the base frame. A disc section is integrally connected with the control gear to be coaxial with the rotation shaft. The disc section is fitted into a hollow formed in the base frame, so that the control gear is rotatably supported to have a sufficient supporting strength with no play.

Abstract: A reduction unit includes a sun gear (2) which is integral with the driving shaft (1), and is equipped at the two ends of the shaft with two identical toothings (3, 4) which mesh with three free planetary gears (7) which in turn mesh with the fixed (10) and rotary (11) internal ring gears; between these ring gears there is a difference of three teeth.

Abstract: Gearing mechanism comprising alike two stages of known planetary gearing arrangement with inner rotational members (1) and (4) mounted to common shaft (a) and the planetary gears (3) and (6) to one common carrier plate (10) and (11). The rotational input being provided by shaft (a), rotational output from outer rotational member (5) to shaft (b) and torque reaction means applied by connection of the outer rotational member (2) to a gearbox housing. Transmission ratio being determined by difference in ratio between the two alike planetary gearing stages.

Abstract: An actuator (10) comprises a housing (40) with movable actuating arms (22, 27, 28) adapted to be attached to a part to be moved. A reduction gear mechanism (14, 15) is held within the housing (40) in such a manner that it is axially and radially retained in the proper operative position without the need for a center through-shaft at the center (25) of the housing (40). The housing (40) is provided with openings at axial ends (31, 32). Z-shaped annular flanges (33, 34) are fixed to the housing (40) and securely receive dust covers (35) when the actuator (10) is shipped for installation. A seal land (36) is formed at the inner periphery of each flange (33, 34) adapted to engage with a drive shaft (11) which is inserted into one of the axial ends (31, 32) after removal of the appropriate dust cover (35).

Abstract: To restrict and further promote differential rotation between first and second output shafts, the power transmission apparatus for differentially transmitting a rotative power supplied to an input shaft to two output shafts comprises a differential gear mechanism coupled between the two output shafts; a multiplying mechanism associated with the differential gear mechanism, for detecting and multiplying a differential rotation; a motor coupled to the multiplying gear mechanism, for restricting or promoting the differential rotation by driving the multiplying gear mechanism in either direction; and a controller for controlling rotative direction and torque of the motor by adjusting supply voltage polarity and motor current magnitude. The multiplying mechanism is a strange gear mechanism or a planetary gear mechanism.

Abstract: The present invention discloses a differential planet gear unit, in which a sun gear is engaged with first and second ring gears coaxially aligned through planet gears interposed therebetween, and the tooth number of the first ring gear is different from the tooth number of the second ring gear, in which the first and second ring gears engage with first and second portions of each planet gear, and the diameters of the addendum circles of the teeth of the first ring gear and the first tooth portion of each planet gear are different from those of the second ring gear and the second tooth portion of each planet gear, respectively, to reduce a difference between an approaching contact length and a receding contact length along a contact action line. The first ring gear and the second tooth portion of each planet gear may be formed with first and second chamfers, respectively, in both sides of the addendum of the teeth to reduce the difference between the approaching and receding contact lengths.

Abstract: A rotary hinge actuator, for instance for rotating a wing flap relative to a wing in an aircraft, has a sun gear, several spindle gears around the sun gear and several annular gear sleeves around the sun gear and spindle gears. Each spindle gear has sections with external helical gear teeth which are slanted in the same direction and which respectively mesh with internal helical gear teeth on the annular gear sleeves. At least one of the sleeves is connected to the wing and at least another to the wing flap. Upon rotating the spindle gears the wing flap is rotated relative to the wing.