Road vehicle with an internal combustion engine and provided with a device for the transmission of the exhaust noise

Patent metadata

Field	Value
Publication number	US-10436085-B2
Application number	US-201715610956-A
Country	US
Kind code	B2
Filing date	Jun 1, 2017
Priority date	Jun 3, 2016
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A road vehicle comprising: a passenger compartment; an internal combustion engine; an exhaust system, which releases into the atmosphere the gases generated by the combustion, is connected to the internal combustion engine, and ends with at least one silencer having at least one outlet pipe; and an exhaust noise transmission device, which is provided with a transmission conduit, which originates close to the outlet pipe of the silencer, ends in the area of a wall of the passenger compartment, and is provided, on the inside, with at least one insulating element, which is arranged inside the transmission conduit so as to tightly seal the transmission conduit.

First claim

The invention claimed is:

1. A road vehicle comprising:
a passenger compartment;
an internal combustion engine;
an exhaust system, which releases into the atmosphere the gases generated by the combustion, is connected to the internal combustion engine, and ends with at least one silencer provided with at least one outlet pipe, through which the gases generated by the combustion flow out of the exhaust system; and
an exhaust noise transmission device, which is provided with a transmission conduit, which originates close to the outlet pipe of the silencer, ends in the area of a wall of the passenger compartment, and is provided, on the inside, with at least one insulating element, which is pneumatically insulating, acoustically permeable, and arranged inside the transmission conduit so as to pneumatically seal the transmission conduit;
wherein a decorative tubular tail pipe surrounding the outlet pipe of the silencer is provided, so that the outlet pipe of the silencer is partially inserted inside the decorative tail pipe and does not touch said decorative tail pipe;
wherein the decorative tail pipe is wider than the outlet pipe and houses, on the inside without mutual contact, a terminal end of said outlet pipe;
wherein the decorative tail pipe has, on the side, a through opening from which the transmission conduit originates; and
wherein the through opening is made through a side wall of the decorative tail pipe arranged in the area of the terminal end of the outlet pipe of the silencer.

2. The road vehicle according to claim 1 , wherein the transmission conduit is integral with the decorative tail pipe and is connected to the decorative tail pipe around the through opening.

3. The road vehicle according to claim 1 , wherein the insulating element comprises a flexible membrane, which locally seals the transmission conduit.

4. The road vehicle according to claim 1 , wherein the insulating element comprises:
a rigid membrane; and
an elastic element, which is arranged around the rigid membrane and is fixed to an inner wall of the transmission
conduit, so as to cause the rigid membrane to be suspended inside the transmission conduit.

5. The road vehicle according to claim 1 and comprising a first sound filtering device of the low-pass type, which is arranged along the transmission conduit downstream of the insulating element.

6. The road vehicle according to claim 5 , wherein the first filtering device comprises a spongy body, which is arranged along the transmission conduit.

7. The road vehicle according to claim 1 and comprising a second sound filtering device of the low-pass type, which is arranged along the transmission conduit downstream of the insulating element.

8. The road vehicle according to claim 7 , wherein the second filtering device comprises a Helmholtz resonator.

9. The road vehicle according to claim 1 and comprising an adjusting valve, which is arranged along the transmission conduit downstream of the insulating element and is designed to change the usable section for the passage through the transmission conduit.

10. The road vehicle according to claim 9 and comprising at least one sound filtering device of the low-pass type, which is arranged along the transmission conduit downstream of the insulating element and upstream of the adjusting valve.

Assignees

• Ferrari Spa

Inventors

• Pompucci Cristiano

Classifications

• F01N1/023 Primary

  Helmholtz resonators · CPC title

• F01N13/082

  of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation (F01N13/20 takes precedence) · CPC title

• F01N2260/16

  for reducing exhaust flow pulsations · CPC title

• F01N13/04

  having two or more silencers in parallel, e.g. having interconnections for multi-cylinder engines · CPC title

• G10K11/22

  for conducting sound through hollow pipes, e.g. speaking tubes · CPC title