EXHAUST GAS MUFFLER MEANS

• US 3,589,469 A
• Filed: 12/10/1968
• Issued: 06/29/1971
• Est. Priority Date: 12/10/1968
• Status: Expired due to Term

• Current Assignee: Hasui Hiroshi, Suyama Eizo
• Original Assignee: Hasui Hiroshi, Suyama Eizo
• Inventors: HASUI HIROSHI, SUYAMA EIZO
• Application Number:
  US04/782,607
• Time in Patent Office: 931 Days
• US Class Current: 181/232
• CPC Class Codes: F01N 1/00 Silencing apparatus characterised by method of silencing by cooling F01N3/02; using liquids F01N3/04
• CPC Class Codes: F01N 1/02 by using resonance
• CPC Class Codes: F01N 2490/20 Chambers being formed inside the exhaust pipe without enlargement of the cross section of the pipe, e.g. resonance chambers

Abstract

An exhaust gas muffler means adapted to be provided in a gas exhaust pipe of the internal combustion engine and the like, comprising a series of buffing elements arranged in and along the gas exhaust pipe. Each buffing element comprises a blind chamber, a throat and a plurality of outlets. The buffing elements are communicated with one after another intermediate a part of the gas exhaust pipe or directly. Not only the barking sounds but also low frequency noise are damped and deadened.

Claims

1. In an exhaust gas muffler means, at least one buffing element comprising a blind buffing chamber having at least a throat and a plurality of outlets, exhaust gas being introduced into said buffing chamber through said throat and expelled out of said buffing chamber through said outlets, and said outlets being positioned so as to direct said exhaust gas sidewise in connection with the direction of the incoming exhaust gas, the elastic coefficient being adjusted so as to effectively damp and absorb the energy of the pulsative dynamic pressure of the pressure waves and intermittent exhaust gas flow, by designing so as to satisfy the following formula:

f ( K X g/w) X (1/2) wherein f represents the resonance oscillation frequency of the buffing chamber, g represents the acceleration of gravity or 980 cm./sec.2, W represents the absolute pressure subjected to the buffing chamber from the throAt by the pressure waves and the intermittent flow of the exhaust gas (in unit of kg./cm.2), and K represents the elastic coefficient of the buffing chamber, or KAkPoS/Ho in which A is the proportional constant, k is the polytropic index, Po is the pressure inside the buffing chamber, S is the cross-sectional area of the throat, and Ho is the lateral length of the buffing chamber.

2. A buffing element as a component of said exhaust gas muffler means as claimed in claim 1, comprising an outer casing, an inner chamber, and an exhaust gas incoming pipe, said outer casing being jointed and communicated with a rear exhaust pipe, said inner chamber being a blind buffing chamber communicated with said exhaust gas incoming pipe through said throat only, and said exhaust gas incoming pipe being provided with a plurality of perforations, through which the same is communicated with the interior of said outer casing.

3. A buffing element as a component of said exhaust gas muffler means as claimed in claim 1, comprising an outer casing, an inner chamber, and an exhaust gas incoming pipe, said outer casing being a part of said exhaust gas incoming pipe, said inner chamber being a blind buffing chamber formed by a thin pipe having a closed tail end and arranged concentrically to said exhaust gas incoming pipe, and said thin pipe having a plurality of perforations at a part in the proximity of its opened head end forming said outlets and jointed with the tail end of a frustoconical through pipe by which said exhaust gas incoming pipe is checked.

4. A buffing element as a component of said exhaust gas muffler means as claimed in claim 1, comprising an outer casing, an inner chamber, and an exhaust gas incoming pipe, said outer casing being a part of said exhaust gas incoming pipe, said inner chamber being a blind buffing chamber formed by a longitudinally tubular space between said outer casing and a thin pipe having an opened tail end jointed with the head end of a frustoconical through pipe, by which said exhaust gas incoming pipe is checked, and said thin pipe having a plurality of perforations forming said outlets at a part in the proximity of its closed head end and being arranged concentrically to said exhaust gas incoming pipe.

5. A buffing element as a component of said exhaust gas muffler means as claimed in claim 1, comprising an outer casing, an inner chamber, and an exhaust gas incoming pipe, said outer casing being a part of said exhaust gas incoming pipe, said inner chamber being a blind buffing chamber formed by an inside pipe arranged concentrically to said exhaust gas incoming pipe and having a closed tail end, and said inside pipe being circumferentially partly jointed with and circumferentially partly disengaged from the inside of said exhaust gas incoming pipe so as to form several longitudinally through troughs between said inside pipe and said exhaust gas incoming pipe.

6. A buffing element as a component of said exhaust gas muffler means as claimed in claim 1, comprising an outer casing, an inner chamber, and an exhaust gas incoming pipe, said outer casing being arranged concentrically to and around a part of said exhaust gas incoming pipe and having a reduced head end and a reduced tail end so as to joint with said part, said part being divided into a front pipe and a rear pipe, said front pipe having a plurality of perforations in the proximity of its opened head end and a closed tail end so as to form a blind buffing chamber, and said rear pipe having an opened head end an opened tail end, so that another blind buffing chamber is formed in the form of a tube between said rear pipe and the rear part of said outer casing.

7. A buffing element as a component of said exhaust gas muffler means as claimed in claim 1, comprising an outer casing, an innEr chamber, and an exhaust gas incoming pipe, said outer casing being a laterally expanded frontward extension of a rear exhaust pipe having a closed head end, said inner chamber being a blind buffing chamber formed by an expanded part having a closed tail end, of said exhaust gas incoming pipe extended into said outer casing, and said exhaust gas incoming pipe having a plurality of perforations between said closed head end and said expanded part.

8. A buffing element as a component of said exhaust gas muffler means as claimed in claim 1, comprising an outer casing, an inner chamber, and an exhaust gas incoming pipe, said outer casing comprising a front chamber and a blind buffing chamber in which said exhaust gas incoming pipe extended through said front chamber has an opened tail end, said inner chamber being said blind buffing chamber, and said exhaust gas incoming pipe having a plurality of perforations in its part arranged in said front chamber so as to communicate with a rear exhaust pipe which has an opened head end in said front chamber.

9. A buffing element as a component of said exhaust gas muffler means as claimed in claim 1, comprising an outer casing, an inner chamber, and an exhaust gas incoming pipe, said outer casing comprising a front chamber, said inner chamber being a blind buffing chamber comprising a blind tail end of said exhaust gas incoming pipe extended through said front chamber and out thereof, and said exhaust gas incoming pipe having a plurality of perforations in its part arranged in said front chamber so as to communicate with a rear exhaust pipe which has an opened head end in said front chamber.

10. A buffing element as a component of said exhaust gas muffler means as claimed in claim 1, comprising an outer casing, an inner chamber, and an exhaust gas incoming pipe, said outer casing being a spheroidal chamber extended from a rear pipe, said inner chamber being a blind buffing chamber arranged inside said spheroidal chamber, and said exhaust gas incoming pipe being extended into said inner chamber and provided with an opened tail end in said inner chamber and a plurality of perforations in said spheroidal chamber so as to communicate with said rear pipe.

11. A group of buffing elements as components of said exhaust gas muffler means as claimed in claim 1, comprising parts of said exhaust gas pipe itself, each of said parts being formed by dividing a length of said exhaust gas pipe into some longitudinal compartments by longitudinal partitions and then dividing each of said longitudinal compartments into a series of subcompartments by lateral partitions extended only within said respective compartment, said lateral partition of any compartment being zigzag arranged to another lateral partition of any other compartment, and said longitudinal partition of any subcompartment being provided with several perforations serving as said throat for said subcompartment and as said outlets for an adjoining subcompartment and another several perforations serving as said outlets for the first-named subcompartment and as said throat for another adjoining subcompartment, whereby said exhaust gas is passed through said part along a generally coiled passage.

12. A group of buffing elements as claimed in claim 11, in which said longitudinal compartments are two.

13. A group of buffing elements as claimed in claim 11, in which said longitudinal compartments are three.

14. A group of buffing elements as claimed in claim 11, in which said longitudinal compartments are four.

15. In an exhaust gas muffler means, at least one buffing element comprising a blind buffing chamber having at least a throat and a plurality of outlets, exhaust gas being introduced into said buffing chamber through said throat and expelled out of said buffing chamber through said outlets, and said outlets being positioned so as to direct said exhaust gas sidewise in connection with the direction of the incoming exhaust gas, said buffing element including an outer casing, an inner chamber, an exhaust gas incoming pipe, and a semispherical gas guide, said outer casing being arranged concentrically to said exhaust gas incoming pipe and jointed with the rear end thereof intermediate a reducer and a rear exhaust pipe intermediate another reducer, said inner chamber being a blind buffing chamber formed between said outer casing and a frontward extension of said rear exhaust pipe, and said semispherical gas guide being arranged inside the first-named reducer in such a manner that an opened head end of said frontward extension forming said outlets is partially covered thereby and that said exhaust gas incoming pipe is communicated with said inner chamber outside said gas guide and said inner chamber is communicated with said opened head end inside gas guide.

16. A buffing element as a component of said exhaust gas muffler means as claimed in claim 15, which is bent in whole in accordance with a curved longitudinal axis.

17. In an exhaust gas muffler means, at least one buffing element comprising a blind buffing chamber having at least a throat and a plurality of outlets, exhaust gas being introduced into said buffing chamber through said throat and expelled out of said buffing chamber through said outlets, and said outlets being positioned so as to direct said exhaust gas sidewise in connection with the direction of the incoming exhaust gas, said buffing element comprising an outer casing, an inner chamber, an exhaust gas incoming pipe, and a semispheroidal gas guide, said outer casing being arranged concentrically to said exhaust gas incoming pipe and having a head reduced part jointed with the rear end of said exhaust gas incoming pipe and a tail reduced part jointed with a rear exhaust pipe, said inner chamber being a blind buffing chamber formed between the rear half of said outer casing and an inner pipe having an opened tail end and jointed with said tail reduced part, and said semispheroidal gas guide having several axial ribs jointed with said outer casing in such a manner that an opened head end of said inner pipe forming said outlets in partially covered thereby and that said exhaust gas incoming pipe is communicated with said inner chamber outside said gas guide and said inner chamber is communicated with said opened head end inside said gas guide.