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US 4,711,140 AGranted
Throttle valve system for automatic transmissions
OwnerGilbert W. Youngerinventor
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OwnerGilbert W. Youngerinventor
Estimating the term…
The present invention provides an improved throttle valve regulating system for automatic transmissions for motor vehicles. In such automatic transmissions, the throttle valve reciprocates in a bore as a result of the action of a plunger and a throttle valve spring to control the flow and pressure of transmission fluid or oil to effect gear shifting. The present improvement provides a rigid spacing element of predetermined length received within the throttle valve spring for urging the valve towards a full throttle position in the event that the valve sticks in the bore in a lower throttle position. The system further includes a high rate spring located in the full throttle position in the bore to prevent sticking of the valve in that position, and a low rate spring similarly positioned in the bore to counteract the force of the throttle valve spring for returning the throttle valve to a low throttle or zero position. The reciprocating throttle valve includes at least one land or circumferential flange having sharpened edges for shearing large particles or other impurities introduced into the bore with the transmission fluid which might otherwise become wedged between the valve and the bore and cause sticking of the valve in a fixed position in the bore.
A throttle valve system for automatic transmissions including a throttle valve member movable within a bore between two predetermined positions, a plunger for driving the throttle valve member in said bore, a throttle valve spring disposed between the plunger and the valve member for transmitting the force exerted by the plunger to the throttle valve member, and
A throttle valve system for automatic transmissions including a throttle valve member movable in a bore, a plunger for driving said throttle valve member in said bore, a throttle valve compression spring disposed between said plunger and said bore for transmitting forces from said plunger to said throttle valve member, and a rigid spacer element disposed within said throttle valve spring, said rigid spacer element having a length less than the length of said throttle valve spring in its non-compressed state and directly abutting against said valve member and applying a force thereagainst under the urging of said plunger only if said valve member sticks in said bore and does not move with said throttle valve spring, said spacer element not directly abutting against said valve member during normal operation of said throttle valve system, the outer surface of said throttle valve member and the inner surface of said bore defining a clearance therebetween, the outer surface of said throttle valve member having at least one sharpened edge for shearing particles wedged in said clearance.
Dependencies are inferred from the claim text.