# US 2014/0196980 A1 · Silencing apparatus for a vehicle

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0196980 A1
- Document ID: US20140196980A1
- Status: Published application
- Kind: A1
- Application number: 13/702,183
- Filed: 2011-07-27
- Published: 2014-07-17
- Earliest claimed: 2011-07-27
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Inventors: Kazutoshi Wakatsuki
- Web page: https://patentgrep.com/patent/US20140196980A1

## CPC

- F01N 1/089: {using two or more expansion chambers in series (F01N1/083, F01N1/084, F01N1/086 take precedence)}
- F01N 2470/20: Dimensional characteristics of tubes, e.g. length, diameter
- F01N 2490/06: the gases flowing longitudinally from inlet to outlet in opposite directions
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)

## Abstract

A muffler has a flattened cross-sectional shape the width of which is greater than its height. The muffler includes therein a plurality of expansion chambers. The muffler also includes an inlet pipe, an outlet pipe and first to third communication pipes, through which the expansion chambers are open to the outside. All of an opening of the inlet pipe, an opening of the outlet pipe and openings of the first to third communication pipes formed in the muffler are arranged such that they fall between a position separated away from one end of the muffler in its width direction by a ¼ length of the width of the muffler and a position separated away from the end of the muffler by a ½ length of the width.

## Claims

### Claim 1

A silencing apparatus for a vehicle, the apparatus comprising:
a muffler having a flattened cross-sectional shape, the width of which is greater than its height;
an inlet pipe, through which exhaust is introduced into the muffler;
an outlet pipe, through which exhaust is discharged from the muffler;
a partition plate, which partitions an interior of the muffler to form a plurality of expansion chambers; and
a communication hole, which extends through the partition plate,
wherein all of an opening of the inlet pipe, an opening of the outlet pipe, and the communication hole formed in the muffler are arranged such that the openings and the hole fall between a position separated away from one end of the muffler in its width direction by a ¼ length of the width of the muffler and a position separated away from the one end of the muffler by a ½ length of the width.

### Claim 2 (depends on 1)

The silencing apparatus for a vehicle according to claim 1, wherein at least one of the opening of the inlet pipe, the opening of the outlet pipe and the communication hole is in contact with the position separated away from the one end of the muffler in the width direction by the ¼ length of the width of the muffler, and at least one of the remainder of the opening of the inlet pipe, the opening of the outlet pipe and the communication hole is in contact with the position separated away from the one end of the muffler by the ½ length of the width.

### Claim 3

A silencing apparatus for a vehicle, the apparatus comprising:
a muffler having a flattened cross-sectional shape the width of which is greater than its height;
an inlet pipe, through which exhaust is introduced into the muffler;
an outlet pipe, through which exhaust is discharged from the muffler;
a partition plate, which partitions an interior of the muffler to form a plurality of expansion chambers; and
a communication hole, which extends through the partition plate,
wherein all of the expansion chambers are formed such that the expansion chambers are open to the outside only in a region between a position separated away from one end of the muffler in its width direction by a ¼ length of the width of the muffler and a position separated away from the one end of the muffler by a ½ length of the width.