| 摘要 |
Improved rack-gear variable compression ratio engines. As compared to the one-sided piston rack of the closest prior art, the two-sided piston rack of the present invention downsizes the engine, improves the high revving capability, decreases the friction and releases the rollers, that carry the trust loads, from most of their loads. In a version with an oppositely reciprocating rack-frame-piston that balances the inertia forces per cylinder, the combination of long piston stroke to small rack-frame-piston stroke allows shorter engine height, less friction and higher rev limit. The in-line three cylinder engine, without counterbalancing shaft, is as vibration free as the conventional six in-line. The in-line five cylinder engine, without counterbalancing shaft, is as vibration free as the best V12 and the Wankel rotary engine.
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