US2037102A - Muffler - Google Patents

Description

B. L. VlPOND MUFFLER April 14, 1936.

Filed July 1, 1953 Patented Apr. 114, 1936 Benjamin Leslie Vipond. Remington, Md.

Application July l, 1933, Serial No. $18,687

it Claims. (@l. ath-Mill) My invention relates to improvements in mufflers for the exhausts of internal combustion engines or the like.

An important object of my invention is the provision of a mufiler which will effectively silence the exhaust without setting up any appreciable back pressure. on the motor or the like.

A further object of my'invention is the provision of a muflier which is of simple and durable construction and which does not have parts subject to wear and breakage, such as the bafiles in use in many mufllers.

Other objects and advantages oi my invention will be apparent during the course oi the iollow= ing description.

In the accompanying drawing which forms a part of this specification and wherein like characters of reference denote like parts throughout the same, I

Figure 1 is a longitudinal sectional view of a mufller. embodying my invention,

Figure 2 ispa transverse section through the inlet end thereof,

Figure 3 is a transverse section through a mui "fier formed in two parts.

Figure 4 11s a fragmentary longitudinal section of amodifled form of mufiler, and,

Figure 5 is a longitudinal section of a still iur= ther modified form of mufiler.

In the drawing, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral l0 designates the muffler casing which is substantially conical in shape and is open at its small discharge end which opens into the usual tail pipe H. The large inlet end of the muflier casing is closed and is preferably dished inwardly as seen at l2 in Figure l. The exhaust pipe l3 enters the mufier casing tangentially immediately adjacent the closed end 62 and discharges the exhaust gases against the side of the casing. The inwardly dished end of the casing forces the gases to follow the casing in a whirling path, as shown by the arrows in Figure 2 and also prevents the drumming sound which would. be set up by the exhaust gases causing vibration of the end of the casing were it not dished. Thisdrumming sound can also be pre vented by dishing the casing end outwardly as shown by dotted lines in Figure l.

The muifler casing is provided with a series oi spaced circumferential grooves i i arranged a intervals and throughout the length of the ca ing. Each successive groove is of less diameter approaching the discharge end of the casing due Y to the tapering of the casing. The portions oi the casing between the grooves ll' taper toward the discharge end of the tube and are preferably, but not necessarily, dished inwardly as indicated at it in Figure l. The grooves l4 therefore divide the casing into a series of successive substantially frusto-conical sections connected with the smaller end of each section merging into the larger end oi the next adjacent section in the direction of the discharge end of the casing, to form a curved shoulder I6 in front of each groove.

The grooves id, shoulders l6 and connecting portions i 5 are curved to merge into one another thereby producing a muiiier casing having a smooth wave like contour with no abrupt turns or shoulders.

In operation, the exhaust gases enter the large end of the muffler casing through the tangentially disposed exhaust pipe i3 and impinge against the wall of the casing. The wall of the casing and the bulged end wall i2 cause the gases to assume a whirling or substantially circular' path around the casing, and this whirling path gradually decreases in diameter, with successive increases in diameter, as the gas approaches the discharge end of the muilier. This whirling motion of the gases together with the rolling of the gases over the rounded ridges and grooves of the casing neutralizes the sound waves and thoroughly silences the exhaust gases without setting up any.appreciable back pressure.

The casing may be formed in any convenient manner. For convenience of manufacture the muflier casing may be formed in two half sections withthe joints overlapped and welded together as shown in Figure .3. With this construcand a plain substantially cone shaped casing provided as in;- Figure 5. In this form of my invention the tangentially disposed exhaust pipe l3 and the inwardly bulged inlet end wall H are upon to produce the whirling or the gases through the casing.

While I have shown and described the preferred embodiment of my invention, is to he understood various changes in the size, shape and arrangement of parts may he resorted to wit-hoot departing from the spirit oi. my inventin or the scope of the suhjoined claims.

Having thus described my invention, what I claim and desire to protect by Letters Patent is:

l. A muilier comprising a substantially co cal casing having a discharge opening at its smaller end, and an inlet pipe extending tangentially through the casing wall at the larger end thereof, said casing having circumferential grooves spaced along its length.

2. A mufiier comprising a substantially corneal shell having a discharge opening at its smaller end, and an inlet pipe extending tangentially through the casing wall at the larger end thereof, said casing having a helical circumferential groove extending longitudinally thereoi'.

3. A muffler comprising a substantially conical casing having a discharge opening at its sine end, an inwardly bulged end wall closing t o larger end of the casing, and an inlet pipe on tending tangentially through the casing wall ad jacent the bulged end wall thereof, said casing having circumferential grooves spaced along its length.

l. A mufiier compiising a substantially conical casing having a discharge opening at its smaller end, an inwardly bulged end wall closing ii larger end of the casing, and an inlet pipe tending tangentially through the casing wall a iacent the bulged end wall thereof, said 0 being provided with helical circumferential groove extending longitudinally thereof.

5. A. muffler comprising a substantially conics" casing having a discharge opening sm end, and an inlet pipe extending tangent l through the casing wall at the larger end there of, said casing having a series of spaced circumferential grooves and rounded shoulders merg' into each groove at the inlet side thereo who by the casing is divided. into a series co aoevgioe substantially fmsto=corlcai sections, the smaller discharge end oi each section opening into the larger inlet end of the adjacent section.

6. A muflier comprising a substantially conical casing having a discharge opening at its smaller end, an inlet pipe extending tangentially through the casing wall at the larger end thereof, said casing having a series of spaced circumferential grooves and rounded shoulders merging into each groove at the inlet side thereof, whereby the casing is divided into a series of connected substantially irusto-conioal sections, the smaller discharge end of each section opening into the larger inlet end of the next adjacent section, and an inwardly bulged end wall at the larger end of the casing.

l. A muffler comprising a substantially conical casing having a discharge opening at its smaller end, an inwardly bulged en wall closing the larger end of the casing, an let pipe extending tangentially through the casing wall adjacent the bulged end wall thereof, said casing provided with a helical circuirn i'ential groove extending longitudinally thereof, and a helical rounded shoulder merging nto said groove throughout its length on the inlet side thereof.

8. .[L rnufier comprising a substantially conical casing having a discharge opening at its smaller end, an inwardly bulged end wall closing the large oi the casing, and an inlet pipe exd tending tangentially through the peripheral wall of the casing at its intersection with the in vlardly bulged end wall whereby gas passing through said inlet pipe will be discharged be twee and the peripheral wall of the casing, said casing be grooved to provide longitudinal cross section a series of restricted portions gradually niergi" I into the other portions of the casing by means of rounded suriac he bulged portion of the casing end well n

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