Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H1/00—Toothed gearings for conveying rotary motion
  • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
  • F16H1/2809—Toothed gearings for conveying rotary motion with gears having orbital motion with means for equalising the distribution of load on the planet-wheels
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H1/00—Toothed gearings for conveying rotary motion
  • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
  • F16H2001/289—Toothed gearings for conveying rotary motion with gears having orbital motion comprising two or more coaxial and identical sets of orbital gears, e.g. for distributing torque between the coaxial sets

Definitions

• the present invention relates to an epicyclic gear comprising a sun gear having two tooth paths, at least three planet wheels, rotatably arranged in a planet carrier and having two tooth paths, an outer ring wheel with an inner gear ring having two tooth paths and a roller ring which is arranged at the inside of the ring wheel between the two tooth paths of the inner gear ring and provided with an inner cylindrical path against which the planet wheels are arranged to abut by means of a surface arranged between the tooth paths of the planet wheels.
• the invention also relates to a roller ring for an epicyclical gear, comprising a ring which has an inner cylindrical path and a recess which is provided in said path.
• Epicyclic gears comprise planet gears in which the ring wheel is stationary while the planet carrier and the sun wheel are rotating, sun gears in which the sun wheel is stationary while the planet carrier and the ring wheel are rotating, and star gears in which the planet carrier is stationary while the ring wheel and the sun wheel are rotating.
• Epicyclic gears may also be constructed such that both the sun wheel, the ring wheel and the planet carrier are arranged in order to rotate.
• each gear wheel only has one tooth path with straight teeth, that is teeth that extend in the direction of the longitudinal axis of the gear.
• epicyclic gears may comprise gear wheels with a tooth path with helical teeth.
• epicyclic gears with straight teeth, of permitting a certain axial movement of the sun wheel in relation to the planet wheels.
• Epicyclic gears with a tooth path with helical teeth give rise to forces of the same size but of opposite direction which act upon diametrically opposite teeth of each planet wheel. These forces result in a moment which tends to turn the planet wheel.
• epicyclic gears may comprise gear wheels each of which has two tooth paths that are parallel and provided axially beside each other with opposite directed helical teeth.
• Such an epicyclic gear has the disadvantage of making the assembly more complicated as the gear wheels cannot move in relation to each other in axial direction, and, accordingly, it is neither possible to assemble the gear only by pushing the gear wheels into each other, which in fact was possible with the types mentioned above.
• the ring wheel is provided in two parts with one tooth path at each part. Accordingly, during the assembly the two parts of the ring wheel can be pushed in over the sun wheel and the planet wheels from a respective direction, and thereafter the parts are connected to each other by means of any suitable joint, for example a bolt joint.
• an epicyclic gear it is well known to mount a roller ring inside the ring wheel, for example between the two inner wheel paths.
• the roller ring has a circular inner roller path against which the planet wheels take support by rolling and to a certain extent gliding upon this path.
• Such a roller ring has as its task to absorb the existing transverse forces while the moment forces are absorbed by the teeth. It contributes to reduce the risk for dynamic instability and vibrations.
• a roller ring is of essential importance.
• the object of the present invention is to provide an epicyclic gear which has a roller ring which in an effective way has the ability of absorbing all transverse forces in all operational situations.
• the epicyclic gear initially defined which is characterized in that the cylindrical inner path is designed such that it forms a continuous support path for the planet wheels, which path extends along the total inner periphery of the roller ring.
• the planet wheels will always be in contact with the inner cylindrical path of the roller ring, and, therefore, the roller ring will absorb all transverse forces in every operational moment. In that way, a stable and vibrational free rotation of the gear is obtained.
• the roller ring has at least one recess in the cylindrical path, and closing means which are arranged to be brought between an open mounting position that releases the recess and makes it possible to insert the planet wheels between the sun wheel and ring wheel, and a closed operational position which closes the recess and makes it possible to recreate the inner cylindrical path in such a way that it extends along the total inner periphery of the roller ring.
• the closing means comprise a portion which has an inner path with the same radius of curvature as the inner cylindrical path of the roller ring and is arranged beside the roller ring and is displaceable between a closed position in which the portion extends over the recess, and an open position in which the path of the portion is located beside the recess.
• the closing means comprise a further roller ring.
• the further roller ring may comprise a recess and be arranged axially beside the roller ring, the roller rings being rotatable in relation to each other between an open position in which the recesses are in alignment, and a closed position in which the recesses are displaced in relation to each other in the peripheral direction.
• the roller rings may be fixed to each other by means of a fixing member which, in a released position, permits a relative motion in the peripheral direction of the roller rings.
• the sun wheel comprises two parts that are releasably connected to each other, and each part bears one of the two tooth paths of the sun wheel.
• Such an embodiment permits the assembly of the gear by provision of the planet wheel in place inside the ring wheel and the roller ring mounted therein, whereafter the two parts of the sun wheel are inserted between the planet wheels from a respective direction.
• the two parts of the sun wheel are connected to each other by means of a bolt joint which extends in axial direction through the two parts.
• each planet wheel comprises two parts which are releasably connected to each other, and each part bears one of the two tooth paths of the planet wheels.
• the assembly of the gear is made possible by holding the ring wheel with the roller ring mounted therein and the sun wheel in place and inserting the two parts of the planet wheels between the sun wheel and the ring wheel from a respective direction.
• the two parts of each planet wheel are connected to each other by means of bolt joints extending in axial direction through both the parts.
• the inventive gear may be a star gear, a sun gear or a planet gear. It may also constitute an epicyclic gear in which the sun wheel, the ring wheel and the planet carrier are arranged to rotate.
• the object of the invention is also obtained by the initially defined roller ring, which is characterized in that the roller ring comprises a second ring and that the rings are rotatable in relation to each other between an open position in which the recess is exposed, and a closed position in which the recess is closed.
• the second ring comprises a recess which is arranged such that the recesses are in alignment during the open position and that they are displaced in relation to each other during the closed position.
• Fig 1 shows an epicyclic gear according to a first embodiment of the invention.
• Fig 2 shows a roller ring for the gear shown in Fig 1 .
• Fig 3 shows an epicyclic gear according to a second embodiment of the invention.
• Fig 4 shows an epicyclic gear according to a third embodiment of the invention.
• the gear 1 comprises a central sun wheel 2 with two tooth paths 2a and 2b.
• a plurality of planet wheels 3 with the corresponding tooth paths 3a and 3b are arranged around the sun wheel 2.
• the planet wheels 3 are supported by a spindle 4 which is provided in a planet carrier 5.
• the planet gear 1 comprises at least three planet wheels 3, but there may also be more such ones arranged around the total periphery of the sun wheel 2.
• a ring wheel 6 is provided around the planet wheels 3, said ring wheel having an inner gear ring with two corresponding tooth paths 6a and 6b.
• the gear 1 has an outgoing shaft 7 which is fixedly connected to the sun wheel 2 and an outgoing shaft 8 which is fixedly connected to the planet carrier 5.
• the inventive gear 1 may, however, also comprise an outgoing shaft which is connected to the ring wheel 6. Accordingly, the present invention can be applied in different combinations.
• the planet carrier 5 may be fixedly arranged, the outgoing shaft which is fixedly connected to the ring wheel 6 for instance being connected to a generator, and the shaft 7 which is fixedly connected to the sun wheel 2 being connected to a turbine shaft.
• the epicyclic gear 1 is called a star gear.
• the gear 1 may also be constructed as a sun gear, the sun wheel 2 being fixedly arranged while the outgoing shaft 8 of the planet carrier 5 and the outgoing shaft of the ring wheel 6 rotate. Furthermore, the gear 1 may be constructed in such a way that all outgoing shafts are arranged to rotate. Finally, the shaft 1 may also be constructed as a planet gear, the ring wheel 6 being fixedly arranged while the outgoing shaft 8 of the planet carrier 5 and the outgoing shaft 7 of the sun wheel 2 rotate.
• the groove 9 Between the tooth paths 3a and 3b of the planet wheels 3 there is a groove 9 which extends fully around the planet wheels 3 in the peripheral direction thereof.
• the grooves 9 have a precision- machined bottom surface.
• a roller ring 10 is arranged between the tooth paths 6a and 6b of the ring wheel 6 .
• the roller ring 10 has an inner cylindrical path 1 1 which extends around the inner periphery of the roller ring 10.
• the planet wheels 3 are arranged to bear on the inner cylindrical path 1 1 of the roller ring 10 by means of the bottom surface of the grooves 9.
• the planet wheels 3 will rotate on the inner path 1 1 in approximately the same way as the balls are rotating in a ball bearing, that is the planet wheels 3 are moving in relation to the roller ring 10 by a combined rolling and, to a certain extent, gliding motion.
• the roller ring 10 shown in Figs 1 and 2 is comprised by two rings 10a and 10b arranged axially beside each other. Each one of these rings has an inner cylindrical path 1 1 a and 1 1 b and a recess 12a and 12b in these inner cylindrical paths 1 1 a and 1 1 b.
• the rings 10a and 10b are concentric and may be rotated in relation to each other in such a way that both the recesses 12a and 12b will be in alignment, opposite to each other. This position is called the mounting position, and in this position it is possible to assemble the gear 1 by lowering the roller ring 10 downwards over the sun wheel 2 and a planet wheel 3.
• a further planet wheel 3 may be inserted between the roller ring 10 and the sun wheel 2 through the two aligned recesses 12a and 12b. Subsequently, this second planet wheel 3 is rolled aside and a further planet wheel 3 can be inserted between the sun wheel 2 and the aligned recesses 12a and 12b. In that way a required number of planet wheels 3 can be arranged, and when this has been done the two rings 10a and 10b of the roller ring 10 are rotated in relation to each other in such a way that the recesses become displaced in relation to each other, for example by 180°.
• each ring 10a and 10b has axially directed openings 13 which define the position that closes the recesses as they are located opposite to each other.
• the gear 1 comprises a sun wheel 2 which is divided in two parts 16 and 17 along the line 15.
• the parts 16 and 17 are kept together by means of a joint, for example by means of the screw joints 18 suggested in Fig 3.
• the epicyclic gear 1 is assembled by putting the roller ring 10 and the two tooth paths 6a and 6b of the ring wheel 6 together, whereafter the planet wheels 3 are put in place and into engagement with the tooth paths 6a and 6b of the ring wheel 6.
• the two parts 16 and 17 of the sun wheel 2 are inserted from a respective direction and are subsequently screwed together by means of the screw joints 18.
• the roller ring 10 accordingly is in one piece and has no recess at the inner cylindrical path 11.
• the planet wheels 3 instead comprise two separate parts 20 and 21 along the line 19. Also by this embodiment the two parts 20 and 21 of the planet wheels 3 are held together by some kind of joint, for example a screw joint 22. In this case the epicyclic gear 1 is mounted by holding the ring wheel
• roller ring 10 which is connected to the roller ring 10, and the sun wheel 2 in a correct position, whereafter the two parts 20 and 21 of the planet wheels 3 are inserted from a respective direction and are connected to each other by means of the screw joints 22. Also in this third embodiment the roller ring 10 is thus in one piece and does not have any recess at the inner cylindrical path 1 1 .

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Retarders (AREA)

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Publications (1)

Family

ID=20400252

Family Applications (1)

Country Status (2)

Cited By (3)

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Citations (4)

• 1995
  • 1995-11-16 SE SE9504091A patent/SE509878C2/sv not_active IP Right Cessation
• 1996
  • 1996-11-15 WO PCT/SE1996/001482 patent/WO1997018407A1/en active Application Filing

Patent Citations (4)

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