Governor for hydraulically controlled automatic transmission

A governor for causing governor hydraulic pressure to be generated only after a rotational speed thereof reaches a predetermined breakpoint speed to hydraulically control an automatic transmission, said governor comprising:

• a sleeve operatively connectable to the automatic transmission for being rotated by the output thereof,
• said sleeve having opposite ends, a sleeve hole extending therein and open to one of said ends, an entrance port communicable with a hydraulic pressure line through which hydraulic line pressure is supplied to the governor, and an exit port through which the governor hydraulic pressure is discharged when the breakpoint speed is reached during rotation of said sleeve by the automatic transmission;
• a flyweight rotatably supported on said one of said ends of said sleeve, said flyweight being swung outwardly with respect to said one of the ends of said sleeve under centrifugal force as the rotational speed of said sleeve is increased;
• a spool extending in an axial direction and slidably mounted to said sleeve in said spool hole,
• said spool operatively connected to said flyweight for being slid in said spool hole along said axial direction by said flyweight as said flyweight is swung outwardly once the breakpoint speed of said sleeve has been attained, and
• said spool having a pressure adjusting means for placing said entrance port in a degree of open communication with said exit port that corresponds to the amount said spool is slid in said spool hole;
• a feedback hydraulic pressure chamber disposed in series with said spool along said axial direction thereof, said feedback hydraulic pressure chamber operatively connected to said exit port for allowing the governor hydraulic pressure to be fed thereto, and said feedback hydraulic pressure chamber in operative communication with said spool in a manner in which the governor hydraulic pressure fed thereto results in a force transmitted to the spool that acts on said spool in a second direction opposite to the direction in which the spool is slid by said flyweight;
• a spring enclosing chamber disposed in series with said spool along said axial direction thereof, said spring enclosing chamber closed to said feedback hydraulic pressure chamber and open to the atmosphere outside the governor;
• and
• a spring enclosed in said spring enclosing chamber and operatively connected to said spool for exerting a preload on said spool in said second direction that establishes said breakpoint speed.