Патент USA US2108671код для вставки
Feb.-l5\,\_i1938. K. KATO MUFFLER OF INTERNAL COMBUSTION ENGINES Filed Dec. 27, 1934 ~ ... .- ,1xk:.u,?kyui 2,108,671 Patented ‘- Feb. 15, 1938 2,108,671 UNITED STATES PATENT OFFICE 2,l08,671 ' - ' MUFFLER OF INTERNAL COMBUSTION ENGINES Kihachi Kato, Tokyo, Japan, assignm- of seven tenths to Gonsahuro Ishibashi, Tokyo, Japan Application December 27, 1934; Serial No. 759,334 In Japan December 27, 1933 1 Claim. ((3. 181-649) The present invention relates to an improved mu?ier which is designedto receive. the discharge gases from internal combustion engines and the like and to discharge them noiselessly, the muffler 5 comprising an’ elongated hollow cylindrical mem ‘ber with a corrugated helical plate therein. In the drawing: ' Figure 1 is a section through a muffler con structed in accordance with the principles of the present'invention; ' Figure 2 is a back view of this muffler; Figure 3 is a section alongthe line A_—B of The principal object of my invention is to pro ‘ Figure 1; and vide a corrugated helical plate which produces Figure 51 shows the muiller in- a front view. _ an interference with high sound waves to ex-' The drawing shows a central pipe i connected 10 tinguish the noise of high frequency sound by to the exhaust pipe of the engine. A corrugated its unevenness of corrugations, and which re duces the pressure of the exhaust gas by its ' helical plate 2 is inserted in the plate. I, said consisting of a central shaft 3 around which whirling motion to extinguish the noise of low aplate corrugated iron band or plate is wound. The frequency sound, and, O?ering minimum resist corrugations on. this band are concentrated at 15 ance to the passage of exhaust gas, ‘avoids the the central portions thereof, the peripheral por accumulation of back pressure in ‘the mufller, which causes a serious loss of power. _ tions being substantially smooth._ A chamber. ' 8 surrounds the central pipe I and is provided A further object of the invention is to pro with several holes 1 which are situated at the vide an apparatus in which the parts thereof. are front side 'of the chamber.-, The gas passes closely assembled and combined, thereby taking V20 up a minimum amount of space and rendering through these holes from the chamber 6 to an outer chamber 8 which concentrically surrounds the device especially applicable for operation in connection with automobiles. A still further object of the invention is to 25 provide a corrugated helical plate which is easily taken out from the cylindrical hollow chamber for removing all foreign matter from said chain ber and corrugated spiral plate.‘ In prior art engines, loud explosions take place 30 when the exhaust valve is opened directly to the atmosphere, the reason being that the pressure in the cylinder is much higher than atmospheric the middle chamber 5. The device is also pro— ‘ vided with a cover 4 which closes the outlet of the central pipe I and which carries one- end of the central shaft 3. The cover 4 is provided with several long channels 5-used for breaking up the gas as it flows into the air. The exhaust gas coming from the exhaust pipe enters the central pipe I and is caused to carry out a revolving motion in the passages formed by the corrugated helical plate 2. pressure and that therefore a sudden discharge , from one to the other will produce a loud re 35 port. The more suddenly this charge takes place and the greater the difference in pressure, the more violent is the explosion. ‘ In accordance with the present invention, means are provided to decrease the pressure and 40 to cause the exhaust gas to ?ow uniformly be ‘The outer diameters of the helical plate decrease con tinuously on the front side to reduce the impact pressure to which the plate is subjected. The revolving gas in the central pipe reaches the partition 8 and flows through comparatively N 5 . large holes l0 into the middle compartment 8. The gas expands in this compartment and flows through the forward end of the device, passing through the holes ‘i into the outer chamber '8, fore it escapes into the atmosphere. The con The gas ?owing rearward in the outer chamber struction and arrangement of the various parts 8 passes through several holes ll back into the central pipe I, which contains ‘a ‘second cor of the apparatus will be brought out more in de rugated helical plate or band 2'. Finally, the V45 tail in the description to follow, which, for a clear gas is discharged into the atmosphere through understanding of the invention, should be con sidered in connection with the accompanying the channel holes 5. The exhaust gas having a high pressure at drawing forming a part thereof, and wherein are the entrance to this muiiier will strike the cor disclosed, for the purpose of illustration, con 50 venient and satisfactory embodiments of the in _ rugated helical plate 2, but this impact pres vention. It is to be noted in this connection sure will be reduced greatly due to the fact that 50 the plate is small in diameter at the point of that minor changes in the construction and ar rangement of the parts may be made without entry and is inclined to the direction of ?ow of departing from the spirit of the invention or the the gas. Consequently,‘ the back pressure of the exhaust gas will be greatly reduced. In the 55 principle of operation of the various parts. course of the backward flow of the gas, it car 55 2 2,108,671 ries out a whirling or revolving motion and theory, therefore, according to the invention the noise may be extinguished without increasing thereby its revolving inertia is increased, so that the high pressure gas will be mixed substan the back pressure of the exhaust gas. tially uniformly with the low pressure gas, the pressure of which approximates that of the at mosphere. Thus, the high frequency sound waves comprising 3000 to 10,000 cycles per second ~ I claim: An exhaust mu?ier comprising an elongated 5 cylindrical tube, a rod in said elongated tube, a helical plate, around said rotatable rod, said. helical plate being centrally corrugated adjacent and which emanate from the exhaust manifold said rod and having a substantially smooth pe are reduced by their impact against the corruga riphery, whereby the high frequency sound waves 10 mix with the low ; emanating from the exhaust manifold are re» tions of the helical band and 10 frequency waves comprising 50 to 440 cycles duced and the noise extinguished. per second, which emanate from the outlet of the muf?er, the reduciton resulting in substantial ex“ - tinction of the noise. Contrary to the general KIHACHI KATO.