Planetary gear transmission systems or components – Planetary gearing or element – Plural planet carriers in series move at different speeds
Patent
1983-07-29
1990-05-22
Diehl, Dwight G.
Planetary gear transmission systems or components
Planetary gearing or element
Plural planet carriers in series move at different speeds
74410, 475331, 475344, 475346, F16H 5710
Patent
active
049267159
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a planetary gear train of the type having at least two planetary gear sets arranged coaxially one behind the other and drivingly connected with one another, wherein each gear set comprises a sun gear, a ring gear and a plurality of intermediate planet gears.
More particularly, the invention is concerned with a planetary gear train having two planetary gear sets arranged coaxially, one behind the other, and drivingly connected with one another. In this type of prior art planetary gear train, both planetary gear sets have the same number of planet gears. If both planetary gear sets are designed for the transmission of the same driving power, then the planet gear cone running at a lower r.p.m. must nevertheless, because of the resulting high torques, be constructed for a higher load and, thus, more strongly. In prior art gearings, this is achieved by using planet gears with a large cross section or large width or large diameter and large width and correspondingly large sun gears and large ring gears. This leads to large and heavy, as well as more expensive, gearings, because the price is essentially determined by the weight. Due to the need for stable construction, it is not possible to provide the sun gears with axial through-holes through which additional components could be passed.
The object of the invention is to provide planetary gear trains of the type mentioned above which are lighter and smaller, as well as less expensive and more versatile in use.
This object is solved by a combination of features wherein, in a planetary gear train of the type described, one of the sets contains less planet gears than the other set, all planet gears of both sets and their respective bearings are constructed identical to each other, each planetary gear set is arranged in a transverse plane perpendicular to the common axis of the planetary gear train, the pitch diameter of the sun and ring gears of the planetary gear set having more planet gears being larger than the corresponding pitch diameter of the other set, and wherein both sets are designed for approximately the same line loading. The invention can lead to savings of up to 50% in weight compared with prior art planetary gear trains. Furthermore, the sun gears of the planetary gear sets can be provided with axial through-holes, because the sun gears have a sufficiently large diameter and, as a result of the force distribution over a large number of gears than is customary in gearings of known construction, a through-hole does not adversely weaken the sun gear.
One embodiment of the invention is shown in the accompanying drawing given by way of illustrative example and will be described below, wherein:
FIG. 1 is an axial section through a gear train embodying the invention, and
FIG. 2 is a schematic front view of the large planetary gear set.
On the driving side of the planetary gear train, one of two gear rims 2 of a tubular clutch piece 1 engages with internal toothing 3 of the hollow sun gear 4 of a planetary gear set 5. Planet gears 7 are provided between this sun gear 4 and a ring gear 6 of the planetary gear set 5. These planet gears 7 are pivotally mounted by means of a self-aligning radial roller bearings 8 on bearing pins 9 of a (planetary gear carrier 10.
The carrier 10 of one planetary gear set 5 has an axial through-hole 11 with internal toothing 12 in which engages one gear rim 13 of a tubular clutch piece 14 of a double articulated gear-tooth clutch, the other gear rim 13 of which engages in the internal toothing 15 of a sun gear 16 of another planetary gear set 17, and which is provided with an axial through-hole. The planetary gears 7 of this other planet gear set 17 are in mesh with the external toothing of the sun gear 16 and with the ring toothing of the internal gear 18 of this set 17. The planet gears 17 of this set 7 are pivotally mounted by means of self-aligning radial roller bearings 8 on bearing pins 22 of a planetary gear carrier 23 of this set 17. This carrier is provided with an axial through-hole 24 and, on i
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"Anordnung mehrerer Umlaufrader bei Planetengetrieben", Bruno, Meier, Konstrukion, 3/10/61, pp. 67-69.
Arndt Heinrich
Hirt Manfred
Diehl Dwight G.
Zahnraderfabrik Renk AG
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