US2457890A

US2457890A - Muffler

Info

Publication number: US2457890A
Application number: US501874A
Authority: US
Inventors: Gale H Hedrick
Original assignee: MAREMONT AUTOMOTIVE PRODUCTS I
Current assignee: MAREMONT AUTOMOTIVE PRODUCTS I; MAREMONT AUTOMOTIVE PRODUCTS Inc
Priority date: 1943-09-10
Filing date: 1943-09-10
Publication date: 1949-01-04
Anticipated expiration: 1966-01-04

Description

Jan. 4, 1949. H. HEDRICK MUFFLER Filed Sept. 10. 1943 Patented Jan. 4, 1949 MUFFLER Gale H. Hedriek, Chicago, 111., assignor to Maremont Automotive, Products, Inc., Chicago, 111., a corporation of Illinois Applieation.September 10, 1943;.Serial No. 501,874-

9. Claims. 1

The. present invention relates to improvements in mufflers for internal combustion engines.

The primary object of the present invention consists in providing a muiiler with means. for reducing the velocity of the exhaust gases discharged to the atmosphere. This means comprises forming the mufller with an inlet opening and an elongated outlet opening or slot. These openings are so proportioned that the cross-sectional area of the outlet opening is always equal to or greater than the cross-sectional area of. the inlet opening or openings to insure the exhaust gases discharging at low velocity from the muffler.

Another object comprehends the provision of a muffler of any suitable shape having an elongated outlet opening with which coacts baflle means positioned within the muffler for reducing the velocity of the gases as they enter the atmosphere.

A further object is to provide a muflier in which the velocity of gases introduced to the atmosphere is so markedly reduced as to (1) prevent flaming of the exhaust, (2) dilute and cool the exhaust gases to preclude condensation, (3) eliminate the blowing of oil particles and carbon out of the, exhaust and (4) preclude the discharge of obnoxious odors.

The mufiier is arranged to be used with any type of internal combustion engine and when associated with a vehicle or an airplane is preferably positioned so that the, exhaust gases are liberated to the atmosphere in: the slip stream to create. a suction efiect upon the exhaust line which substantially reduces back pressure. The improved form of muflier also materially increases the efiiciency of a supercharger and in. some instances dispenses with the use of the same.

Other objects and advantages of the invention will become apparent from the following description when taken in conjunction with the accompanying claims and drawings.

Referring to the drawings in which are shown several preferred embodiments the invention may assume:

Figure 1 is an elevation of a further modification of the mufiier;

Figure 2 is an end view of Figure 1, partly in section;

Figure 3 is a sectional view taken substantially along the line Ill-l8 of Figure 1.;

Figure 4 is an elevation of another modification;

Figure is an end view of Figure 4, partlyin section, and.

Figure 6 is a sectional view taken substantially along the line 2l2| of Figure 4.

Referring to: the drawings, and particularly Figures; 1, 2 and 3, the muflier is constructed and arranged to be associated with the exhaust pipe leading from a Diesel motor (not shown) of the type used on power shovel-s. The elongated casing 65 is preferably of cylindrical shape in cross-section and is provided with a: series of spaced depending tubular inlet nipples 66. Six of. these inlets are shown, but the number may bevaried and each inlet nipple 66 is preferably formed at its. outer end with slots 61 so asto telescopically receive the adjacent end of an exhaust pipe and be firmly secured thereto by suitable clamping means, such as shown at 68. The ends of the muffler 65 are closed bythe walls 69 and the mufller is provided with an elongatedopening or slot 10 preferably co;-extensive in length with the muiiler; The length of the muffler 65 and the, cross-sectional area of the opening M are. such that the area of the opening Hi is equaltc. or greater than the combined crossrsectional areaaof the inlet 66. The opposite sides oftheopening 10 may be provided with outwardly extending flanges 1 I; formed by angle ironsiand. providing. an outwardly flaring passage directing theexhaust gases to the atmosphere.

Withinthe-m-uiiler t5 and extending the, length thereof are a pair of curved or arcuate radially extending metal partition members inthe, form of: sheets, or plates 12- and 1.3(Fig. L7) which are positioned so; that they curve in opposite directions and have their central portions disposed tangential to each other as shown at 14. These bafilemembers extend throughout the length of the muffler and have their edges suitably, connected to the interior wall thereof asshown. The; member 1 2' is positioned to comprehend the inlets 66;. The arcua-te portion of the baffle member l2, extending from the point of tangency 14 to; the wallet the muiiler adjacent the outlet 10 continuous, i. e. not perforated, as shown at 15,,while the arcuate portion of the member 121 remote fromthe. outlet 10 and extendin 'from the point ct tangency 14 to the mufller wall is perforated, a shown. at 1.6. The member 13 is perforated throughout its area. In this manner, gases en.- tie-ring the compartment 11 defined by the mem-- ber 12 pass through the perforations 18 into the communicating compartment 18, and thence into the. communicating compartment 19 defined by themember 13. From this latter compartmenhthe gases pass intothe communicating compartment 802 from. which they discharge into the atmosphere through the opening Ill. Not only is the velocity of the gas from the exhaust reduced, but it is expanded and cooled in such a manner as to leave the outlet 10 in a. smooth continuous stream having a favorable low velocity. The mufller shown in Figures 1, 2, and 3, having the baffle members 12, 13, has been found highly efficient when used in conjunction with the exhaust of a Diesel engine, such as is employed on road machinery, e. g. power shovels.

In the modification shown in Figures 4, 5, and

6, the muffler 82 is arranged to be connected with the exhaust of an engine of the type used on "Jeeps and other similar motor vehicles. The mufiler 82 is of cylindrical shape and has two spaced inlet nipples 83 arranged to be connected by any suitable clamping means to the exhaust pipe of the motor (not shown). ends 84 and an elongated narrow exhaust outlet 85 which extends the length of the mufiler and may be provided with a downwardly inclined discharge nozzle 88, shown disposed at an acute angle relative to the inlets 83, but which may be at any other desirable angle. Within the muflier are four radially extending baflle members or partition plates 88, 89, 98, and 9| which divide the interior of the casing into four separate compartments. The member 88 which is disposed between the inlets 83 and the outlet 85 is con-- tinuous i. e. not perforated so as to cut off the entrant gases from direct communication with the outlet. The members 89, 9D, and SI are perforated so that the exhaust gases discharged into the muffler are required to circulate through each of the four compartments defined by the baffle plates between the continuous member 88 and the perforated member 89. The length of the muliler 82 and the cross-sectional area of the outlet 85 are such that the area of the opening 85 is equal to or greater than the total cross-sectional areas of the inlets 83 so as to reduce the velocity of the exhaust gas discharged to the atmosphere. The muffler is connected to any suitable part of the Jeep; it may be positioned under one of the front mud guards.

It will be observed that in all forms of the invention the length and width of the exhaust outlet in the mufiler has a cross-sectional area equal to or greater than the cross-sectional area of the inlet or inlets, so that the exhaust gases will discharge at low velocity to the atmosphere. Moreover, each of the mufilers is provided with baffle means for causing the exhaust gases to lose velocity while circulating through the mufiler and also the gases are permitted to expand and cool before being discharged to the atmosphere at low velocity. The gases introduced to the atmosphere are subjected to dilution, due to the nature of the outlet, whereby the exhaust gases are more readily mixed with the atmosphere than if they were exhausted through a round pipe at high velocity. Also, the several muiliers with their baffle structures form, in efiect, resonating chambers to eliminate noise. Further, the shape and size of the exhaust outlet is such that when the mufller is associated with a motor vehicle or an airplane, it may be positioned in the slipstream, so as to produce a low pressure area about the outlet and eliminate back pressure, thereby increasing the efiiciency of the motor.

It will be understood that the several forms of the invention shown are merely illustrative of preferred embodiments, and that such changes may be made as fall within the purview of one skilled in the art without departing from the The mufller has I 4 spirit of the invention and the scope of the appended claims.

Iclaim:

l. A mufller comprising a casing having an inlet and an elongated outlet of reduced Width with respect to the inlet, the cross-sectional area of the outlet being at least equal to the cross-sectional area of theinlet, and means within the casin separating the same in-to compartments, said means including plates having perforations, one of said plates having a non-perforated portion, the non-perforated portion being disposed between the inlet and outlet so that the exhaust gases circulate through the separate compartments before discharging through the outlet to the atmosphere.

2. A muffler comprising a casing having an inlet and an elongated outlet Of reduced width with respect to the inlet, the cross-sectional area of the outlet being at least equal to the cross-sectional area of the inlet, and means within the casing separating the same into compartments, said means including oppositely curved plates having perforations, one' of said plates having a nonperforated portion, the non-perforated portion being disposed between the inlet and outlet so that the exhaust gases circulate through the separate compartments before discharging through the outlet to the atmosphere.

3. A muiiler comprising a casing having an inlet and an elongated outlet of reduced width with respect to the inlet. the cross-sectional area of the outlet being at least equal to that of the inlet so to reduce the velocity of the gas discharged through the outlet, spaced radially extending plateswithin. the casing, one of said plates being continuous and positioned between the inlet and outlet and other of said plates being perforated, said plates dividing the interior of the casing into compartments through which the exhaust gases circulate prior to being discharged through the outlet to the atmosphere.

4. A muiiler comprising a cylindrical casing having spaced inlet openings and an elongated outlet opening of reduced Width with respect to the inlet disposed at an acute angle to the inlet openings, the c1Oss-secti0nal area of the outlet being at least equal to that of the inlet so as to reduce the velocity of the gas discharged through the outlet, spaced radially extending plate within the casing. one of said plates being continuous and positioned between the inlet and outlet and. other of said plates being perforated, said plates dividing the interior of the easing into compartments through which the exhaust gases circulate prior to being discharged through the outlet to the atmosphere.

5. A muffler comprising a casing having an inlet opening in one end and an elongated outlet opening in the side thereof and means within the casing separating the same into compartments, said means including radially extending partition members, one of said members having a non-pen forated portion disposed between the inlet and outlet of the muflier.

6. A mufiier comprising a casing having an inlet opening in one end and an outlet opening in the side thereof and means within the casing separatin the same into compartments, said means including radially extending partition members, one of said members having a non-perforated portion disposed between the inlet and outlet of the rnuiller.

'7. Amuifier comprising a casing having an inlet opening in one end and an outlet opening of 5 an area at least equal to that of the inlet opening in the side thereof and means within the casin separating the same into compartments, said means including radially extending partition members, one 01' said members having a non-perforated portion disposed between the inlet and outlet of the mufiier.

8. A mufller comprising a casing having an inlet opening in one end and an outlet opening of an area greater than that of the inlet opening in the side thereof and means within the casing separating the same into compartments, said means including radially extending partition members, one of said members having a non-perforated portion disposed between the inlet and outlet of the muflier.

9. A mufller comprising a casing having an inlet opening in one end and an elongated outlet opening in the side thereof, and means within the casing separating the same into compartments, said means including radially extending oppositely curved partition members having tangential engagement, one of said members having a nonperforated portion disposed between the inlet and outlet of the mufiier.

GALE H. HEDRICK.

REFERENCES CITED UNITED STATES PATENTS 15 Number Name Date 2,270,115 E1101; Jan. 13, 1942 2,343,371 Fisher Mar. '7, 1944