Adjustable fully automatic vacuum modulator control for automatic transmission having a vacuum modulator
This patent describes a multispeed automatic transmission system for vehicles having transmission gears which shift from low to high to low in response to the acceleration and deceleration of the vehicle wherein a vacuum modulator control is mounted in the vacuum line between the vacuum modulator and the intake manifold. The improvement described here is in the vacuum modulator control. The control is adapted for mounting at any desired location in the engine compartment comprising a cylinder, a piston slidably positioned in the cylinder. The cylinder has a front end face and a rear end face and a peripheral surface. A resilient means is in the cylinder for urging the piston toward one of the end faces and a stop means in the cylinder remote from the resilient means limits the amount of movement of the piston in the cylinder. A first port communicates with the interior of the cylinder through the peripheral surface, the first port communicating with the vacuum modulator, second and third ports communicating with the interior of the cylinder through the peripheral surface. The second and third ports communicate with the intake manifold whereby during deceleration air flows into the cylinder through the first port and exits from the cylinder through the second and third ports with the piston being urged against the resilient means and whereby during acceleration air flows into the cylinder through the second and third ports and exits from the first port with the piston being urged away from the resilient means.
- Assignee:
- Tran-Saver, Inc., Cleveland, OH
- Patent Number(s):
- US 4621544
- OSTI ID:
- 7068531
- Resource Relation:
- Patent File Date: Filed date 28 Jun 1984
- Country of Publication:
- United States
- Language:
- English
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