Multiple-transmission-ratio transmission arrangement with gear-s

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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Details

74752D, B60K 4118, F16H 374

Patent

active

040418090

ABSTRACT:
The transmission arrangement includes first and second hydraulically activatable units. When the first and second units are activated and unactivated, respectively, the arrangement exhibits a first transmission ratio. When the first and second units are unactivated and activated, respectively, the arrangement exhibits a second transmission ratio. Electrically controllable first and second valves each connect an associated unit to a source of hydraulic fluid. A transmission-ratio changeover is effected by causing the valves to undergo opposite changes of energization state. Each valve has its own time-delay stage. Upon receipt of a signal commanding a transmission-ratio changeover, each time-delay stage delays the initiation of the change of energization state of the associated valve by a respective time-delay interval. During a changeover from the first to the second transmission ratio, the initiation of the change of energization state of the first valve can be made to either lead or lag that of the second valve, simply by making the first time-delay interval either shorter or longer than the second time-delay interval.

REFERENCES:
patent: 3640156 (1972-02-01), Mori et al.
patent: 3732755 (1973-05-01), Beig et al.
patent: 3823621 (1974-07-01), Kubo et al.
patent: 3898893 (1975-08-01), Hashimoto et al.

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