GB2055959A

GB2055959A - Improvements in silencers

Info

Publication number: GB2055959A
Application number: GB7938951A
Authority: GB
Original assignee: OHASHI IND
Current assignee: OHASHI IND
Priority date: 1979-08-02
Filing date: 1979-11-09
Publication date: 1981-03-11
Also published as: DE2946036A1; JPS5625012U

Abstract

A plurality of vanes 1 are accommodated in a housing 2 and extend over the full length thereof. The vanes 1 are twisted over the length of the housing and are angularly spaced around the axis of the housing. <IMAGE>

Description

SPECIFICATION Improvements in mufflers or silencers The present invention relates to a muffler or silencer to be connected to the tip of an exhaust pipe of a vehicle.

Conventional mufflers, through which the exhaust gas from internal-combustion engines passes, have only the effect of deadening the noise of exhaust gases.

It is an object of the present invention to provide a muffler which, in addition to the abovementioned effect, has also the effect of forcibly whirling the exhaust gases so that the succeeding portion of the exhaust gases may be sucked into the muffler and thereby the engine efficiency may be kept from being lowered by exhaust resistance.

With this object in view which will become apparent from the following detailed description, the present invention will be more clearly understood in connection with the accompanying drawings, in which: Fig. 1 is a partially cutaway front view of a muffler according to the present invention; Fig. 2 is a partially cutaway left-hand side view thereof; Fig. 3 is a partially cutaway right-hand side view thereof; and Fig. 4 is a right-hand side view thereof.

Referring now to the drawings, the muffler in accordance with the present invention includes six vanes 1 accommodated in a housing 2. Each of the vanes 1 is provided with tongues 3 and 4. The tongue 3 is spot-welded to a ring 6 provided on the inner wall of the housing 2 in the proximity of an inlet port 5. The vanes 1 are angularly spaced around the axis of the housing 2 and gently twisted over the total length thereof so that, when they are exposed to a flow of exhaust gas, the vanes 1 may spirally redirect the flow.

The housing 2 comprises two parts 7 and 8 which define an expansion chamber 9 and a compression chamber 10, respectively. The vanes 1 extend over the total length of these two chambers. Each of the parts 7 and 8 is in the form of a truncated cone. The smaller circular edge of the part 8 forms a discharge port 11 , while the larger circular edge of the part 8 is configured in conformity with that of the part 7 to which the former is connected as by means of a flange. In the proximity of the discharge port 1 the tip 12 of each vane 1 is steeply twisted so that the tongue 4 may be fastened to the inner wall of the part 8 with a rivet 1 3 inserted into a hole 14.

In the expansion chamber 9, the longitudinal edges of the vanes 1 close to the axis of the housing 2 abut on each other so that the exhaust gases may be subjected to centrifugal effect immediately after they are admitted into the muffler.

In the compression chamber 10, a concavity or recessed portion 1 5 is provided in the longitudinal edge of each vane 1 close to the axis of the housing 2 so that the exhuast gases may be compressed after they are expanded in the expansion chamber 9. The depth of the recessed portion 1 5 reaches substantially half of the width of the vane 1. The exhaust gases are further compressed and whirled when they reach the tips 12 of the vanes 1, so that a windspout or whiriwind of the exhaust gases may be caused without fail in the discharge port 11.

A tubular shell 1 6 provided around the discharge port 11 coaxially therewith serves to keep the exhaust gases whirling round the axis of the housing 2 so that the succeeding portion of the exhaust gas may be drawn out by the preceding portion thereof.

The muffler in accordance with the present invention serves to improve engine efficiency, reduce fuel consumption, and faciiitate the complete combustion of fuel, in addition to having the effect of deadening the noise of exhaust gas.

This muffler can be connected to the exhaust pipe of an internal-combustion engine carried by various kinds of vehicles ranging from a motorbike to a dieselized motor truck with a loading capacity of 10 tons or more, provided that the volume of the housing 2 and/or the number of vanes 1 is adjusted to the piston displacement.

This muffler can also be applied to the chimney of a bath furnace, etc. and to the exhuast pipe of a vacuum cleaner.

1. A muffler comprising a housing and a plurality of vanes accommodated in said housing and extending over the total length of said housing, said vanes being twisted over the length thereof and angularly spaced around the axis of said housing.

2. The muffler as set forth in claim 1, wherein each of said vanes is fixed to the inner wall of said housing by means of two tongues provided on the edge of each of said vanes.

3. The muffler as set forth in claim 2, wherein one of said two tongues is spot-welded to a ring provided on the inner wall of said housing in the proximity of the inlet port of said housing and the other of said two tongues is riveted to the inner wall of said housing in the proximity of the discharge port of said housing.

4. The muffler as set forth in claim 1, 2 or 3, wherein said housing comprises two parts which define an expansion chamber on the inlet port side and a compression chamber on the discharge port side respectively.

5. The muffler as set forth in claim 4, wherein each of said two parts of said housing is in the form of a truncated cone, the larger circular edges of said two truncated cones being configured in conformity with each other and connected to each other.

6. The muffler as set forth in claim 4 or 5, wherein in said expansion chamber, the longitudinal edges of said vanes close to the axis of said housing abut on each other and, in said compression chamber, a recessed portion is provided in the longitudinal edge of each of said vanes close to the axis of said housing.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in mufflers or silencers The present invention relates to a muffler or silencer to be connected to the tip of an exhaust pipe of a vehicle. Conventional mufflers, through which the exhaust gas from internal-combustion engines passes, have only the effect of deadening the noise of exhaust gases. It is an object of the present invention to provide a muffler which, in addition to the abovementioned effect, has also the effect of forcibly whirling the exhaust gases so that the succeeding portion of the exhaust gases may be sucked into the muffler and thereby the engine efficiency may be kept from being lowered by exhaust resistance. With this object in view which will become apparent from the following detailed description, the present invention will be more clearly understood in connection with the accompanying drawings, in which: Fig. 1 is a partially cutaway front view of a muffler according to the present invention; Fig. 2 is a partially cutaway left-hand side view thereof; Fig. 3 is a partially cutaway right-hand side view thereof; and Fig. 4 is a right-hand side view thereof. Referring now to the drawings, the muffler in accordance with the present invention includes six vanes 1 accommodated in a housing 2. Each of the vanes 1 is provided with tongues 3 and 4. The tongue 3 is spot-welded to a ring 6 provided on the inner wall of the housing 2 in the proximity of an inlet port 5. The vanes 1 are angularly spaced around the axis of the housing 2 and gently twisted over the total length thereof so that, when they are exposed to a flow of exhaust gas, the vanes 1 may spirally redirect the flow. The housing 2 comprises two parts 7 and 8 which define an expansion chamber 9 and a compression chamber 10, respectively. The vanes 1 extend over the total length of these two chambers. Each of the parts 7 and 8 is in the form of a truncated cone. The smaller circular edge of the part 8 forms a discharge port 11 , while the larger circular edge of the part 8 is configured in conformity with that of the part 7 to which the former is connected as by means of a flange. In the proximity of the discharge port 1 the tip 12 of each vane 1 is steeply twisted so that the tongue 4 may be fastened to the inner wall of the part 8 with a rivet 1 3 inserted into a hole 14. In the expansion chamber 9, the longitudinal edges of the vanes 1 close to the axis of the housing 2 abut on each other so that the exhaust gases may be subjected to centrifugal effect immediately after they are admitted into the muffler. In the compression chamber 10, a concavity or recessed portion 1 5 is provided in the longitudinal edge of each vane 1 close to the axis of the housing 2 so that the exhuast gases may be compressed after they are expanded in the expansion chamber 9. The depth of the recessed portion 1 5 reaches substantially half of the width of the vane 1. The exhaust gases are further compressed and whirled when they reach the tips 12 of the vanes 1, so that a windspout or whiriwind of the exhaust gases may be caused without fail in the discharge port 11. A tubular shell 1 6 provided around the discharge port 11 coaxially therewith serves to keep the exhaust gases whirling round the axis of the housing 2 so that the succeeding portion of the exhaust gas may be drawn out by the preceding portion thereof. The muffler in accordance with the present invention serves to improve engine efficiency, reduce fuel consumption, and faciiitate the complete combustion of fuel, in addition to having the effect of deadening the noise of exhaust gas. This muffler can be connected to the exhaust pipe of an internal-combustion engine carried by various kinds of vehicles ranging from a motorbike to a dieselized motor truck with a loading capacity of 10 tons or more, provided that the volume of the housing 2 and/or the number of vanes 1 is adjusted to the piston displacement. This muffler can also be applied to the chimney of a bath furnace, etc. and to the exhuast pipe of a vacuum cleaner. CLAIMS

7. The muffler as set forth in claim 6, wherein the depth of said recessed portion is substantially half of the width of said vane.

8. The muffler as set forth in any preceding claim, wherein the tip of each of said vanes is steeply twisted in the proximity of the discharge port of said housing.

9. The muffler as set forth in any preceding claim, wherein a tubular shell is provided around the discharge port of said housing coaxially therewith.

10. A muffler constructed substantially as hereinbefore described with reference to the accompanying drawings.