Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1984-01-26
1986-10-14
Staab, Lawrence J.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4116
Patent
active
046165320
ABSTRACT:
An automatic transmission has first and second pressure actuated friction engaging devices to provide a lower speed stage when the first friction engaging device is engaged and the second friction engaging device is disengaged, or vice versa; a speed shift valve which changes over supplying and exhausting hydraulic fluid pressure to and from the first and second friction engaging devices; a downshift timing system which provides lower flow resistance at lower road speed and higher flow resistance at higher road speed in a passage for supplying hydraulic fluid pressure to the first friction engaging device; an upshift timing system which provides higher flow resistance to a passage for exhausting hydraulic fluid pressure from the first friction engaging device before the hydraulic fluid pressure in the second friction engaging device increases to a predetermined value and lower flow resistance to the same drain passage when the hydraulic fluid pressure in the second friction engaging device has increased to the predetermined value; and a bypass passage which incorporates a one way valve and conducts hydraulic fluid from the first friction engaging device towards the speed shift valve by bypassing the downshift timing system.
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Minemoto Isamu
Sakai Takahiro
Novais David A.
Staab Lawrence J.
Toyota Jidosha & Kabushiki Kaisha
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