Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Reexamination Certificate
1999-01-29
2001-04-10
Ta, Khoi Q. (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
C477S130000
Reexamination Certificate
active
06213915
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a modified valve body and more particularly, the present invention relates to a valve body and automatic transmission incorporating the valve body as well as a method of operating the valve body for enhanced torque capacity from an automatic transmission.
BACKGROUND OF THE INVENTION
In a conventional automatic overdrive transmission, two distinct input shafts are provided consisting of an outer and an inner input shaft. Accordingly, power train energy can be manipulated to enhance torque output. Typically, in the conventional transmission the outer input shaft is driven by the turbine of the torque converter, while the inner input shaft receives drive energy from the front cover of the torque converter. The cover rotates continuously during the operation of the engine.
The outer input shaft is responsible for operation of first gear, second gear, reverse gear and partly for third gear (60%). In contrast, the inner input shaft partly operates third gear and fourth gear entirely.
A system whereby such a transmission could be employed for enhanced torque capacity given the input shaft relationship has not been previously recognized in the art.
SUMMARY OF THE INVENTION
One object of the present invention is to provide an improved transmission and method of operation for increasing the torque capacity of a standard automatic overdrive transmission.
A further object of the present invention is to provide a method of increasing torque capacity in an automatic overdrive transmission, the transmission having a third gear and fourth gear clutch assembly, a reverse/forward clutch assembly and a torque converter with a turbine, the method comprising:
providing a valve body having a plurality of hydraulic valves for controlling up shift and downshift of transmission gears, the body having a network of fluid passages therein;
providing an automatic overdrive transmission having an inner input shaft and an outer input shaft coaxially arranged with the outer input shaft, the inner input shaft for partially operation of third gear and entire operation of fourth gear;
coupling the inner input shaft and the outer input shaft to the turbine of the torque converter; and
selectively blocking the fluid passages for redirecting hydraulic fluid flow in the passages of the valve body to operate the reverse clutch assembly in third gear whereby torque capacity of the transmission is increased.
A further object of one embodiment of the present invention is to provide a method of increasing torque in an automatic overdrive transmission, the transmission having a third gear and fourth gear clutch assembly, a reverse/forward clutch assembly and a torque converter with a turbine, the method comprising:
providing a valve body having a plurality of hydraulic valves for controlling up shift and downshift of transmission gears, the body having a network of fluid passages therein;
providing an automatic overdrive transmission having an inner input shaft and an outer input shaft coaxially arranged with the inner input shaft, the inner input shaft for partially operation of third gear and entire operation of fourth gear;
removing the inner input shaft and the outer input shaft;
coupling the single shaft to the turbine of the torque converter; and
selectively blocking the fluid passages for redirecting hydraulic fluid flow in the passages of the valve body to operate the reverse clutch assembly in third gear whereby torque output of the transmission is increased.
A still further object of one embodiment of the present invention is to provide an automatic overdrive transmission having increased torque output, comprising;
an automatic overdrive transmission including a third gear and fourth gear clutch assembly, a reverse/forward clutch assembly, a torque converter with a turbine an inner input shaft and an outer input shaft, the inner input shaft for partially operation of third gear and entire operation of fourth gear;
the inner input shaft and the outer input shaft coupled to the turbine of the torque converter; and
a valve body having a plurality of hydraulic valves for controlling up shift and downshift of transmission gears, the body having a network of fluid passages therein, at least some of the passages being blocked for redirecting hydraulic fluid flow in the passages of the valve body to operate the reverse clutch assembly in third gear whereby torque capacity of the transmission is increased.
Having thus described the invention, reference will now be made to the accompanying drawings illustrating preferred embodiments.
REFERENCES:
patent: 5142940 (1992-09-01), Hasegawa
patent: 5360487 (1994-11-01), Sepe
patent: 5536221 (1996-07-01), Lee
patent: 5540628 (1996-07-01), Younger
patent: 5624342 (1997-04-01), Younger
patent: 5730685 (1998-03-01), Younger
patent: 5743823 (1998-04-01), Younger
patent: 5768953 (1998-06-01), Younger
patent: 5820507 (1998-10-01), Younger
(Marks & Clerk)
Lentec Automatics Inc.
Sharpe Paul S.
Ta Khoi Q.
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