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XY 7 erable variation of the torque dur- ing a revolution. A high peak of the torque is reached four’ times during every engine revolution with low values of only about 10 per cent between two peaks. But as the high and low values coincide on both pin- ion contacts of the low speed gear the resulting action on the latter is always a pure turning moment which is weaving in size continually but the teeth never lose their contact. amount of tooth pressure may be considerably different on both sides yet the tooth contact will always be maintained and positive. In _ this Way one engine may take a greater load than the other and yet the op- eration of the gear unit will con- tinue to be smooth and _ noiseless. The . ATHWARTSHIP SECTION THROUGH GEARS ON THE HERMAN FALK For smooth vibrationless and noise- less operation of the geared unit, it is essential first, that the maximum tooth pressures on both sides of the low speed gear be of about the same magnitude, second, that the tooth con- tact be maintained. Nega- tive torques must be avoided. The teeth will stand up ex- ceptionally well even under occasional, extraordinary over- loads but they will show dis- tress if the tooth pressure oscillates between positive and negative values. The greatest interest in this unique installation cen- ters not in the detailed de- sign and construction of the two, eight-cylinder, four-cycle, SSOOL SSS SOOM YAN \ (ea Ios lr, y Lhd mn LEDLILLLLULLL Ny ptt da mera ON Wr a aS j Y Ali |} y Z Soe wee Ee SZ PASS Wy SS fi fol é SSS lca N % J sos olf J ye ew) SOCAL yy Saaaay br] } (; Hyp : SN j iy i P | EE | | eee NV Be ASSESS comparatively high-speed oil engine. It may be taken for granted that the engineering skill and practical ex- perience of the staff of the builder is sufficient guarantee that these en- gines will compare favorably with other similar types. The main in- terest of this installation lies un- doubtedly in the application of a practical gear reduction for recipro- cating oil engines. Most engineers apparently have a natural prejudice against the appli- cation of gearing in corinection with reciprocating engines. It is reason- able however to assume that in this instance where the builder is well known as a specialist in gearing for reduction drives that the installation supplied to the HERMAN FALK will prove to be entirely reliable and effi- cient. There are certain reasons for this belief based on experience. In his own plant the builder has a gen- erating unit driven by four, 4-cylin- der diesel engines of a combined pow- er of 2200 brake horsepower driving a generator through reduction gear- ing. The engine speed in this case N Ny y VA RSS Ny 4 es ry 9 W TY Va ime J A SSS SSSA borer S¢ SLELISEEEL A Sa _é EE ey Re ee SS by ss erase yee it ES - SSS SSS SSS SSS i SLETISOLISIL ALZZZ 22 VLALVRL eR Eee RLeLEReLeBuLpeceeeewnneenunenuuel SVaSeeee ue euaeueceuauaeuunt CLL, Pond | & S) \aee > Sirossorccrarsorrrrs a Fd V) eo wo Y & ag g y g Gee eee Oe EO EM A SECTION THROUGH MAIN GEAR PINION, FALK COUPLINGAND 8-CYLINDER. DIESEL ENGINE ON THE HERMAN FALK 22 MARINE REVIEW—December, 1927