Shift mechanism for a manual planetary transmission
View Patent ↗A plurality of shift rails are manipulated by a manual control rod to selectively actuate one or more synchronizer mechanisms. The control rod is moved angularly and linearly during ratio selection. Each synchronizer mechanism may control two or more drive ratios in a planetary transmission. At least two of the rails are interconnected by a reversing mechanism to permit consistent movement of the rails regardless of the direction of movement of the control rod.
1. A manual control apparatus for controlling shifting of synchronizers in a planetary transmission while a manual control is manipulated through a conventional H-pattern, said control comprising:
a manual input rod;
means for manipulating said manual input rod in a neutral condition;
means for manipulating said manual input rod in a fore and aft motion wherein a shift rod is rotated angularly in a first direction during fore movement and in an opposite direction during aft movement of said manual input rod;
a plurality of shift rails aligned substantially parallel with said shift rod and wherein at least two of said shift rails are interconnected for opposite movement;
engaging means on said shift rod for engaging said shift rails to provide manipulation of said shift rails during selection of a plurality of ratios in said planetary transmission; and
said interconnected shift rails being moved in an opposite direction independently of which of said shift rails is connected with said engaging means on said shift rod.
2. The manual control apparatus for controlling shifting of synchronizers in a planetary transmission while a manual control is manipulated through a conventional H-pattern defined in claim 1 , said control further comprising:
said engaging means on said shift rod comprising a plurality of pins and each of said shift rails having a slot selectively alignable with respective one of said pins.
3. The manual control apparatus for controlling shifting of synchronizers in a planetary transmission while a manual control is manipulated through a conventional H-pattern defined in claim 2 , said control further comprising:
said pins being aligned with said respective slots during manipulation of said manual input rod in said neutral position to move said rails linearly during fore and aft motion of said manual input rod.
4. The manual control apparatus for controlling shifting of synchronizers in a planetary transmission while a manual control is manipulated through a conventional H-pattern in claim 1 , said control further comprising:
said interconnected rails being interconnected by a lever system to control opposite movement.
5. The manual control apparatus for controlling shifting of synchronizers in a planetary transmission while a manual control is manipulated through a conventional H-pattern in claim 1 , said control further comprising:
said interconnected rails being interconnected by a rack and pinion gear system to control opposite movement.