Planetary gear transmission systems or components – Planet periphery surrounds axis of interacting gear
Patent
1997-04-10
1999-09-21
Ta, Khoi Q.
Planetary gear transmission systems or components
Planet periphery surrounds axis of interacting gear
475168, 475178, 384619, 384622, F16H 132
Patent
active
059546093
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a gear system according to the preamble to claim 1.
In conventional gear systems of the type already mentioned, such for example as are described in WO 95/22017, the output members are mounted in the basic member via cylindrical elements. In this case a plurality of running spaces are provided in which there are disposed either radially or axially aligned roller members. The consequence of this is that the gear system has an unacceptable dimension in the axial direction. A further disadvantage involved in the conventional gear system consists in the fact that at least two running spaces, which must be equipped with high-precision bearings, must be present. This renders manufacture of the gear system not only complex but cost-intensive. On the other hand, e.g. in the U.S. Pat. Nos. 1,269,235, 3,275,391, 3,814,488, 4,479,683 or German Patent 859 699 there are disclosed bearings which are suitable for transmitting radial and axial forces, and comprise an outer ring, an inner ring and guide members (cages or partitions) for the cylindrical roller members mounted between the rings. The rings, which are cost-intensively produced with high precision, with defined radial and axial wall thicknesses, still have the disadvantage that they take up space even during their insertion, at the expense of the guided part. A disadvantage of previously-known bearings, finally, is to be seen in the fact that the bearings must be individually adapted to the parts. This relates in particular to the measurements (axial length and radial thickness) of the rings.
Based on the above prior art, the purpose of the invention is to provide assistance here.
The set purpose is fulfilled according to the invention by the features of claim 1.
It is recognised in any case that the invention is fulfilled if there is formed between the basic member and the output member at least one annular hollow cavity, which serves as a running space for roller members, only cylindrical roller members preferably being mounted in this running space, i.e. no additional outer ring, inner ring or cage, some of said roller members being so aligned that they absorb the forces acting in the axial direction of the gear system between the basic member and the output member, while the other roller members are aligned approximately orthogonally to the first-named roller members, and are provided in order to absorb the radial forces acting between the basic member and the output member. It is of particular advantage to provide roller members whose radial cross-section is circular. This cross-section can in this case be constant, yet may continuously increase or decrease also from the centre of the roller member towards both its ends. In the simplest construction of the invention, however, conventional roller members, manufacturable at high precision, are preferably used in the form of cylinders. In such cases a particularly precise mounting of the output member is achieved if the bearing surfaces formed in the output member and basic member are correspondingly machined and designed. This is however already possible with a minimum of technical outlay, especially as it is sufficient if a step is formed respectively in both members, said steps defining in common the necessary running space. Due to the measures proposed a bearing is provided in which the function of the previously-known bearing rings is taken over by the basic member and the output member. The gear is thus a part of the bearing, or the bearing an integral component of the gear. The bearing is not separately identified in relation to the gear, nor is it any longer necessary. The result of this however is that the roller members can be disposed in the outermost radial area of the output member, yet without the necessity to reduce the outer diameter of the disc-shaped output member. These measures are used with advantage in gears with a high transmission ratio.
Further appropriate and advantageous developments of the invention will become apparent from the secondary claims.
Some embod
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Kasper Horst M.
Spinea s.r.o.
Ta Khoi Q.
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