Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1996-02-16
1999-06-01
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
475168, F16H 152
Patent
active
059083727
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a gear system in accordance with the preamble to claim 1.
Such gear systems are used in particular at transmission ratios in the range of 1:6 to 1:250 with a large specific load-carrying capacity in relation to the weight and the external dimensions of the gear system. Previous gear systems with high transmission ratios are known and are for example described in U.S. Pat. No. 4,846,018. In this gear system the reduction mechanism comprises a primary and a secondary reduction stages. The primary stage comprises a central pinion and a plurality of satellite wheels with toothing on the outer circumference. The secondary stage comprises a system of crankshafts whose external portions carry rotarily mounted gear wheel tracks with an external toothing, which mesh with the internal toothing of the wheel. The crankshafts are mounted at their ends in flanges, which are connectable together in a non-rotary fashion. The central pinion operates in conjunction with the satellite wheels of the primary stage, which are located at the ends of the input crankshaft. A substantial disadvantage of this gear system resides in the low specific torque capacity which is limited by the power transmission of the bearings of the input crankshafts. Moreover, the dimensions of the roller bearings of the crankshafts are so selected that small gear systems of the order of magnitude of 50 to 100 mm cannot be manufactured without difficulty. These roller bearings also restrict the specific torque capacity of the gear system. There is further disclosed in DE 28 35 973 a further gear system which also comprises a central input shaft upon the eccentric portions of which are located rotarily mounted satellite wheels with an external toothing. These gear wheels mesh with a wheel with an internal toothing. The satellite wheels are provided with continuous axial openings. In order to avoid sliding friction in the line contact range between the pins and the satellite wheels, there are located on the pins bushes which, however, do not remove the actual sliding friction and the problems involved therewith. Due to the sliding friction and the resultant lost heat, the rated speed of the gear system is chronologically limited. This friction wears the contact surfaces and increases inaccuracies in the reduction mechanism of the gear system, which is particularly undesirable when high precision of the gear system is required. Therefore, in the known case, efforts are made to obtain a high degree of manufacturing precision of the individual components.
Proceeding from the above prior art, the purpose underlying the invention is to provide assistance here.
The purpose set is fulfilled according to the invention by the features of claim 1.
The proposed gear system comprises at least one wheel with an inner toothing (internal geared wheel), and regularly two circular and disc shaped flanges, which are rotatably mounted in relation to this wheel. The gear system has an input shaft with eccentric portions which are offset to one another by approximately 180.degree.. Rotarily mounted on these portions are wheels with an external toothing (planet wheel). The axes of the eccentric portions are offset in relation to the axis of the input shaft by the same amount (eccentricity). The wheels with external toothing mesh with the wheel with internal toothing and they are located between the output members (flanges). In many cases it is appropriate if the output members are not-rotatable relative to one another. In this case the wheels having an external toothing are provided with axial openings through which there are passed connecting elements, without contact in relation to the wheels. In this case the output members are connected so as to be releasable from one another but yet non-rotatable. Apart from this non-rotatable connection of the output members, the connecting members can also define the relative axial position of the output members. The wheels with external toothing have such a degree of freedom that they can execute orbital movem
REFERENCES:
patent: 3979167 (1976-09-01), Grove
patent: 4271726 (1981-06-01), Ryffel
patent: 4846018 (1989-07-01), Matsumoto
patent: 5468193 (1995-11-01), Yamaguchi
Kasper Horst M.
Spinea s.r.o.
Ta Khoi Q.
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