Power transmission device provided with more than two pistons and method of determining return spring force in the same
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United States of America Patent
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Oct 4, 2016
Issued Date -
N/A
app pub date -
Aug 4, 2014
filing date -
Feb 28, 2014
priority date (Note) -
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Abstract
A method of determining a return spring load in a power transmission device including two or more pistons is disclosed. The power transmission device may include: a housing configured to form a mounting space; a clutch pack configured to include a plurality of separate plates splined to the housing, and a plurality of friction disks alternately disposed with the separate plates, the separate plates and the friction disks being selectively coupled to each other by friction; a power transmission plate configured to be splined to the friction disks; two or more pistons operatively connecting the housing to the power transmission plate by selectively applying an axial force to the clutch pack by an operating hydraulic pressure supplied to the piston chamber; and at least one return spring configured to provide a return spring load against an axial force caused by the operating hydraulic pressure.
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