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
  • F16H57/00—General details of gearing
  • F16H57/02—Gearboxes; Mounting gearing therein
  • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
  • F16H57/022—Adjustment of gear shafts or bearings
• • 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
• • 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
  • F16H1/48—Special means compensating for misalignment of axes, e.g. for equalising distribution of load on the face width of the teeth
• • 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
  • F16H57/00—General details of gearing
  • F16H57/02—Gearboxes; Mounting gearing therein
  • F16H57/028—Gearboxes; Mounting gearing therein characterised by means for reducing vibration or noise

Definitions

• the object of this invention is a planetary gear construction that consists of a sun wheel, planet wheels with carrier, and a ring wheel, the gear construction being such that at least one of the transmission shafts leading to the gearing is supported on the planetary gear region in such a way that it is able to adjust itself in such a manner that the said shaft allows the wheel or gearing that it is carrying to move freely within certain limits as a result of the centralizing power created by the gearing.
• the purpose of this invention is to improve planetary gear bearing especially in such transmission constructions in which a certain part of the gearing can move freely with respect to the other parts. It is already well known that in certain applications it is advantageous for the durability of the planetary gear to allow for example the sun wheel to move freely with respect to the planet wheels at which time it seeks such a place for itself among the planet wheels so that the load is divided equally amongst: the wheels. If the shaft is at this point heavy and its free length quite large, the shaft and at the same time the whole gearing may however tend to vibrate especially if the load on the gearing is small.
• the purpose of this invention is to eliminate the aforementioned drawback.
• the shaft: or shafts in question are fastened with bearings to the frame of the gearing at the planetary gear or in its near vicinity with the aid of an elastic part.
• the elasticity of the said part is chosen so that it is rigid enough to prevent the radial movement caused by gravity or such of the said shaft and of the wheel it is carrying with respect to the other wheels when the torque transmitted by the gearing is small, but the elasticity is chosen so that it gives way enough to allow the centralizing of said wheel with respect to the other wheels when the torque transmitted by the gearing is large.
• Figure 1 illustrates a planetary gear in accordance with the invention in which the sun wheel's shaft can adjust itself elastically with respect to the rest of the gearing.
• both the ring wheel and the sun wheel are elastically fastened with bearings to the stationary planet wheels' carrier.
• Figure 1 shows a conventional planetary gear which consists of a sun wheel 1, planet wheels 2, and ring wheel 3.
• the ring wheel 3 is connected to the frame 4 of the gearing and power is transmitted from the sun wheel 1 to the planet wheels' 2 carrier 5 or vice versa.
• the planet wheels' 2 carrier is firmly connected to its shaft 6 which is fastened with bearings in a normal manner to the frame 4. That end of the sun wheel's 1 shaft 7 that is away from the gearing is fastened directly to the frame with the aid of for example a conventional needle roller bearing 8 but at the end that is near the gearing the bearing is elastic in accordance with this invention by fastening the ball-bearing 9 to the frame with the aid of a rubber circular bushing 10.
• the rigidity of the said rubber bushing 10 is chosen so that it allows the sun wheel 1 to adjust itself with respect to the planet wheels 2 in such a way that its load is equally divided among all of the wheels when the torque transmitted by the gearing is large. This is advantegous because in this manner an even and gear-saving performance is achieved even when the tolerances given by the manufacturer for the gearing are not particularly strict or if the gearing is otherwise not quite symmetrical as is always to some extent the case in practice.
• the rubber bushing 10 is rigid enough to prevent the sun wheel 1 from falling in between the planet wheels 2 where the shaft's 7 own weight tends to press the shaft 7 within the limits set by the clearance of the toothing on the wheels.
• the manner described above can be used to prevent the tendency of the shaft 7 to vibrate when the torque transmitted by the gearing and at the same time the centralizing power that the sun wheel 1 creates is small.
• the shaft 12 of the planet wheels' carrier 11 is elastically fastened to the frame 13 with the aid of a bearing 14 and a circular rubber bushing 15.
• the construction performs in the same manner as the planetary gear in the previous example.
• the planet wheels' 16carrier 17 is stationary and the shafts 20,21 of both the ring wheel 18 and the sun wheel 19 are fastened elastically with bearings to the frame with the aid of rubber bushings 22 and 23 which are placed in connection with those bearings 24,25 of the shafts 20 and 21 that are closest to the planetary gear.
• the invention is of course not restricted to the examples whose realizations are illustrated above, on the contrary it can be applied to many different kinds of planetary gears and to their different combinations any time that a self-centralizing construction is desired without the harmful tendency of the rotating part to vibrate within the limits set by the toothed surface.

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

Applications Claiming Priority (2)

Publications (1)

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ID=8513926

Family Applications (1)

Country Status (3)

Cited By (1)

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• 1980
  • 1980-11-18 FI FI803595A patent/FI61338C/fi not_active IP Right Cessation
• 1981
  • 1981-11-16 EP EP19810903141 patent/EP0064533A1/de not_active Withdrawn
  • 1981-11-16 WO PCT/FI1981/000085 patent/WO1982001753A1/en not_active Ceased

Non-Patent Citations (1)

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