Air intake silencer

Abstract

An air intake silencer includes a box-shaped expansion chamber constructed of identically dimensioned, separable halves respectively connected to a carburetor intake system and a tubular intake member. In a basic form of the silencer, the tubular intake member includes a metal tube mounted in the expansion chamber and having a single elongate opening in communication with the interior of the chamber, the tube being connected so as to form a continuation of a hose located exteriorly of the chamber. For obtaining more effective silencing, air distribution and filtering the basic form of the silencer may be altered by dividing the expansion chamber in half with a perforated baffle plate and/or by substituting a perforated metal tube for the aforedescribed metal tube.

We claim: 
     
       1. An expansion chamber for an air intake silencer, comprising: upper and lower identically dimensional and configured chamber halves; said upper chamber half including a closed top wall joined to a depending wall means having a lower end defined by a first flange and terminating in first plane inclined upwardly from a rear location to a front location of the lower end; said lower chamber half including a closed bottom wall joined to an upright wall means having an upper end defined by a second flange and terminating in a second plane which is parallel to the first plane; said first and second flanges defining respective connection surface means which cooperate to form a telescopic joint whereby the lower and upper ends respectively of the depending and upright wall means are releasably joined together; an air inlet opening means being provided in the depending wall means of the upper chamber for connection to a tubular inlet member; and an air outlet opening means, for connection to carburetor intake means, being provided at a forward location in the upright wall means of the lower chamber at a level which places at least a portion of the outlet opening means at a level above a rear location of the second flange whereby easy access may be had to the air outlet opening means, when the upper chamber half has been disconnected from the lower chamber half, so that carburetor adjustments may be made by inserting a tool through the outlet opening means. 
     
     
       2. The expansion chamber defined in claim 1 wherein a baffle plate containing perforations is supported in the expansion chamber such that one side of the plate cooperates with the upper chamber half to form a first compartment while another side of the plate cooperates with the lower chamber half to form a second compartment. 
     
     
       3. The expansion chamber defined in claim 2 wherein said perforations are positioned in a plurality of rows; each perforation having a louvre extending thereabove and located on said other side of the plate; and the louvres of adjacent rows of said perforations being inclined toward each other. 
     
     
       4. The expansion chamber defined in claim 1 wherein the depending and upright wall means respectively of the upper and lower chamber halves each include a plurality of interior stiffener ribs; and certain ribs of the upper chamber half extending from the closed top wall and being respectively aligned with and connected to certain ribs of the second chamber half extending from the closed bottom wall whereby the expansion chamber includes stiffener ribs which traverse the telescopic joint. 
     
     
       5. The expansion chamber defined in claim 4 wherein said certain ribs of the upper and lower chamber halves each have end surfaces which are located adjacent the telescopic joint; the end surfaces of the certain ribs of the upper chamber half being coplanar with each other, and the surfaces of the certain ribs of the lower chamber half being coplanar with each other and parallel to the end surfaces of the certain ribs of the upper chamber half; and a perforated baffle plate mounted in said expansion chamber in sandwiched relationship between the end surfaces of the certain ribs of the upper chamber half and the end surfaces of the certain ribs of the lower chamber half. 
     
     
       6. The expansion chamber defined in claim 5 wherein the end surfaces of some of the certain ribs of the upper chamber half are provided with pins projecting therefrom which are respectively received in holes located in some of the end surfaces of some of the certain ribs of the lower chamber half, and vice-versa, and said baffle plate including passages respectively having the pins of the upper and lower chamber halves extending therethrough. .Iadd. 7. An air intake silencer for an internal combustion engine, comprising: an expansion chamber of a generally rectangular box configuration including top and bottom walls joined by front, rear and opposite sidewalls; an air inlet opening provided in one of the walls at an upper location in the box; an air outlet opening provided in the front wall at a lower location in the box; and said box being made up of upper and lower sections releasably joined at a joint which, in side view, is inclined upwardly from a rear location, at a level below that of at least a portion of the air outlet opening, to a front location at a level above that of the air outlet opening. .Iaddend..Iadd. 8. The air intake silencer defined in claim 7 wherein a baffle plate containing perforations is supported in the expansion chamber such that one side of the plate cooperates with the upper section to form a first compartment while another side of the plate cooperates with the lower section to form a second compartment. .Iaddend..Iadd. 9. The air intake silencer defined in claim 7 wherein the joint is composed of cooperating interior surfaces; and said baffle plate being sandwiched between and supported by said surfaces. .Iaddend.