VALVE PISTON REPOSITIONING APPARATUS AND METHOD
First Claim
1. A method for extending the life of an automatic transmission booster valve, the method comprising:
- partially disassembling the automatic transmission;
disassembling a booster valve assembly from the automatic transmission;
removing an original booster valve spring of the booster valve assembly;
replacing the original booster valve spring with a replacement booster valve spring configured to shift an operating range of a booster valve piston from a worn portion of a booster valve passage to an unworn portion of the booster valve passage;
reassembling the booster valve assembly into the automatic transmission; and
reassembling the automatic transmission.
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Accused Products
Abstract
Apparatus and method for extending the life of a booster valve in an automatic transmission. The booster valve commonly resides in the pump stator body and is modulated by reverse oil pressure and pressure control solenoid pressure signals. Pressure signals from the reverse oil pressure and the pressure control solenoid force a booster valve piston towards a pressure regulator valve piston also generally residing in the pump stator body. The booster valve piston slides inside a booster valve sleeve, and over time, the booster valve sleeve wears and the performance of the booster valve degrades or fails. The present invention replaces an original inner booster valve spring with a longer (or in some cases shorter) replacement booster valve spring to shift the operating range of the booster valve piston to an unworn portion of the booster valve sleeve to extend the life of the booster valve.
50 Citations
9 Claims
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1. A method for extending the life of an automatic transmission booster valve, the method comprising:
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partially disassembling the automatic transmission; disassembling a booster valve assembly from the automatic transmission; removing an original booster valve spring of the booster valve assembly; replacing the original booster valve spring with a replacement booster valve spring configured to shift an operating range of a booster valve piston from a worn portion of a booster valve passage to an unworn portion of the booster valve passage; reassembling the booster valve assembly into the automatic transmission; and reassembling the automatic transmission. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for extending the life of an automatic transmission booster valve, the method comprising:
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partially disassembling the automatic transmission to access a pump stator body of the automatic transmission; removing a booster valve sleeve and a booster valve piston from the pump stator body; removing an original inner booster valve spring normally residing between the booster valve piston and a pressure regulator valve piston inside an outer spring; replacing the original inner booster valve spring with a replacement inner booster valve spring having a longer length L and higher spring rate than the original inner booster valve spring, the replacement inner booster valve spring configured to shift an operating range of the booster valve piston from a worn portion of a booster valve passage in the booster valve sleeve to an unworn portion of the booster valve passage; reassembling the booster valve assembly into the pump stator body; and reassembling the automatic transmission. - View Dependent Claims (8)
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9. A method for repairing an automatic transmission booster valve, the method comprising:
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partially disassembling the automatic transmission to access a pump stator body of the automatic transmission; removing a booster valve sleeve and a booster valve piston from the pump stator body; removing an original inner booster valve spring normally residing between the booster valve piston and a pressure regulator valve piston inside an outer spring; replacing the original inner booster valve spring with a replacement inner booster valve spring having a longer length L and higher spring rate than the original inner booster valve spring, the replacement inner booster valve spring configured to shift an operating range of the booster valve piston approximately ⅛
inches;inserting a bumper shim inside the replacement inner booster valve spring; reassembling the booster valve assembly into the pump stator body; and reassembling the automatic transmission.
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Specification