Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
1997-12-22
2003-05-06
Wachsman, Hal (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
C702S033000, C073S862080, C073S862191, C073S862230, C073S862270
Reexamination Certificate
active
06560549
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to a drive train of an earth moving machine, and more particularly, to a method for determining the torque of a drive shaft of an earth moving machine.
BACKGROUND ART
Earth moving machines such as front wheel loaders are used generally for digging operations and for transferring bulk material from a stock pile onto transport vehicles such as trucks or railroad cars. In such machine loading applications, the front and rear axle may experience excessive torque which will effect the life of the axle. If accurate front and rear driveshaft torques can be calculated, then the possibility exists to determine a cumulative axle life. The ability to determine a cumulative axle life would enable prognostic information to be provided to the operator of the machine regarding how much life was left on the loader axles. Knowing the remaining life would enable the operator to schedule an axle overhaul or replacement and thus greatly reduce downtime due to axle failure. In addition, the ability to determine transmission output torque and axle life will enable a mine manager to evaluate the effects of different blast techniques, material types, and operators on axle and drivetrain life.
The present invention is directed to overcome one or more of the problems set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention, a method for determining a torque of a driveshaft is disclosed. The driveshaft is connected to a drivetrain having an engine, a torque converter, a front and rear axle, and a transmission. The method includes the steps of determining an output torque of the converter, and a gear reduction of the transmission. The total driveshaft torque is then determined in response to the converter output torque and the transmission gear reduction.
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Fonkalsrud Andrew O.
Kough Bradford A.
Reiners Eric A.
Caterpillar Inc
McPherson W Bryan
Wachsman Hal
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