Continually variable transmission having torque regeneration ope

Details Continually variable transmission having torque regeneration ope Continually variable transmission having torque regeneration ope

1987-12-28

1989-08-15

Braun, Leslie A.

Machine element or mechanism

Gearing

Plural power paths to and/or from gearing

74689, 74695, 74763, 74681, F16H 3700

Patent

active

048563692

ABSTRACT:
A continually variable transmission includes a fluid coupling having an impeller driven from a power source and a turbine adapted to be driven hydrodynamically from the impeller or to be connected mechanically to the impeller by a lockup clutch. The turbine drives the shaft on which a sprocket wheel of a constant speed ratio chain drive mechanism and a sheave of a variable ratio belt drive mechanism are rotatably carried. The output sprocket of the chain drive mechanism is connected through a regeneration mode clutch to the ring gear of a dual planetary gearset. The output sheave of the belt drive mechanism is connected directly to the sun gear of the planetary gearset or through a first mode clutch to the carrier of the gearset, on which the first and second sets of planetary pinions are rotatably mounted. The reverse brake selectively holds the ring gear to produce reverse drive. The transmission accelerates the vehicle from rest by disengaging the regeneration clutch and engaging the first mode clutch. The mode of operation can be shifted by reversing the engagement of these clutches when the speeds of their components become substantially synchronous upon changing the belt ratio to the ratio of the fixed chain drive mechanism. A one-way clutch permits the chain drive mechanism to overrun in the first mode and to become locked in the second mode. The belt drive mechanism drives the ring gear from the fluid coupling turbine in the first mode and drives the input sprocket of the chain drive mechanism from the ring gear in the regeneration mode.

REFERENCES:
patent: 3340749 (1967-09-01), Magg et al.
patent: 4290320 (1981-09-01), Abbott
patent: 4458558 (1984-07-01), Frank
patent: 4539866 (1985-09-01), Koivunen
patent: 4553450 (1985-11-01), Gizard
patent: 4589303 (1986-05-01), Roberts
patent: 4624153 (1986-11-01), Itoh et al.
patent: 4633736 (1987-01-01), Sakakihara et al.
patent: 4644820 (1987-02-01), Macey et al.
patent: 4644821 (1987-02-01), Sumiyoshi et al.

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