Automatic transmission and speed change control method

Details Automatic transmission and speed change control method Automatic transmission and speed change control method

1990-10-25

1992-03-31

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

475276, 475281, B60K 4104

Patent

active

050997181

ABSTRACT:
An automatic transmission includes a plurality of frictional engagement means and a gear train including a plurality of rotary members and adapted to be set to a plurality of speeds of different gear ratios in accordance with the engagement/disengagement statuses of the frictional engagement means. The gear train has a plurality of kinds of combination patterns of engagement/disengagement of the frictional engagement means for setting a predetermined speed and the number of revolutions of any of its rotary members can vary according to which of the engagement/disengagement patterns is selected. Speed control means is provided for selecting one of the combination patterns of the frictional engagement means for setting the predetermined speed so as to decrease the fluctuating number of revolutions of the rotary members.

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