Automatic transmission

Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive

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475282, 475283, F16H 344, F16H 366

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active

058533443

ABSTRACT:
Smooth driving of a vehicle is achieved by eliminating busy shift by providing a small gear ratio step between the two highest gear ranges while maintaining structural compactness of the transmission. In the second highest gear range or state, a first pinion P1 has a diameter smaller than that of a second pinion P2, both pinions P1 and P2 being coupled integrally and at least partially determining the second highest gear ratio. The gear ratio .lambda..sub.2 in the second highest gear range is described as 1+(Z.sub.S2 /Z.sub.R1).times.(Z.sub.P1 /Z.sub.P2). Since (Z.sub.P1 /Z.sub.P2) is always equal to 1.0 or less, the gear ratio can be made smaller without enlarging the diameter of the ring gear R1 significantly to decrease the gear ratio step to the highest gear range.

REFERENCES:
patent: 2584468 (1952-10-01), Kelbel
patent: 2827805 (1958-03-01), Miller
patent: 5006102 (1991-04-01), Takase et al.
patent: 5133697 (1992-07-01), Hattori
patent: 5224908 (1993-07-01), Nishida et al.
Patent Abstracts of Japan, vol. 950, No. 1, 20 Jan 95.
Patent Abstracts of Japan, vol. 11, No. 302, 30 Apr. 87.

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