| 摘要 |
A Roots supercharger has an extended cavity with 103 mm diameter rotors having chambers defined by interleaved helical lobes with equal angular face offsets exceeding 60 degrees from inlet to outlet end faces angled in directions opposite to directions of rotor rotation. The chambers have angular seal times of less than 67 degrees of rotation. A preferred embodiment has a displacement of 122 cu mm/revolution, rotor length of 208 mm, face offsets of 65.3 degrees and seal time of 58.6 degrees. The rotor lobe helix angle is essentially 0.314 deg/mm, equal to the helix angle of a prior art supercharger with rotors of common diameter, displacement of 112 cubic inch/revolution, rotor length of 191 mm, previously considered maximum, 60 degree face offset, previously considered optimum, and seal time of 67 degrees. Both flow volumes and efficiency of the new configuration are improved from the prior art wherein the 60 degree face offset was considered optimum.
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