| 摘要 |
1,094,877. Intake and exhaust systems for engines. J.S. KOPPER. Jan. 6, 1965 [Jan. 23, 1964], No.544/65. Headings F1B and F1J. The intake and/or exhaust pipes of a piston engine or pulse type jet engine have means for varying their effective acoustical lengths to produce resonance in the pipes assisting the charging and removal of exhaust at varying engine speeds. In Fig. 1 the effective length of the intake pipe 6, opening into a plenum chamber 8, is varied by a slide 11 movable manually to open holes 9a . . . 9f in the pipe. The exhaust pipe 3 opens into a telescopic sliding sleeve 15 opening into an expansion chamber 16, the effective length of pipe 3 being varied by moving the sleeve by means of control rod 17. The resonance effects in the pipes 6, 3, may be amplified by Helmholtz resonators 7, 14, connected thereto. Alternatively or in addition, each pipe may have a pulse producing device (7a), Fig. 5 (not shown), connected thereto to increase the pulse effects in the pipes. The device (7a) comprises a diaphragm (55) operated by an electromagnet (51) energized by a switch (21) actuated by an engine-driven cam (23). In a modification Fig.6 (not shown) the slides (11), (15), are adjusted automatically by an engine driven centrifugal governor operating a master hydraulic piston actuating slave pistons attached to the slides.
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