| 摘要 |
An improved piston ring assembly comprises a double-offset expander spring and a piston ring. The expander spring has a first wave portion that is continuously engaged in an annular groove of a piston body, the wave portion having an axial extent that is nearly identical to that of the groove. The spring also has a second wave portion with an axial extent less than that of the first wave portion. The second wave portion is adapted to engage a mating slot of the piston ring. The expander spring, rather than the piston ring, is primarily relied upon to engage the groove of the piston body to eliminate assembly slippage and provide axial centering. Thus, the radial thickness of the piston ring may be greatly reduced to improve conformability and reduce oil consumption.
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