# US 2013/0152559 A1 · Tailpipe collar > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0152559 A1 - Document ID: US20130152559A1 - Status: Published application - Kind: A1 - Application number: 13/329,374 - Filed: 2011-12-19 - Published: 2013-06-20 - Earliest claimed: 2011-12-19 - Assignees: Chrysler Group LLC - Inventors: E. Timothy Pawl - Web page: https://patentgrep.com/patent/US20130152559A1 ## CPC - F01N 13/082: {of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation (F01N13/20 takes precedence)} - F01N 2470/24: Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled - 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 An exhaust system for a vehicle may include a tailpipe and a collar. The tailpipe may be adapted to receive exhaust gas from an internal combustion engine and may include an outlet. The collar may include an inner surface, an outer surface, an air-inlet, and an air-outlet. The inner surface may be radially spaced apart from the tailpipe and may at least partially surround the outlet of the tailpipe. The inner and outer surfaces may be shaped to form a profile that causes a first air-flow to accelerate upon flowing between the inner surface and the tailpipe to a first velocity that is faster than a second velocity of a second air-flow. The second air-flow may be flowing adjacent the outer surface and radially outward relative to the outer surface. ## Claims ### Claim 1 An exhaust system for a vehicle comprising: a tailpipe adapted to receive exhaust gas from an internal combustion engine and including an outlet; and a collar including an inner surface, an outer surface, an air-inlet, and an air-outlet, the inner surface being radially spaced apart from the tailpipe and at least partially surrounding the outlet of the tailpipe, the inner and outer surfaces being shaped to form a profile that causes a first air-flow to accelerate upon flowing between the inner surface and the tailpipe to a first velocity that is faster than a second velocity of a second air-flow flowing adjacent the outer surface and radially outward relative to the outer surface. ### Claim 2 (depends on 1) The exhaust system of claim 1, wherein a first pressure of fluid between the air-inlet and the air-outlet is lower than a second pressure of fluid upstream of the outlet of the tailpipe. ### Claim 3 (depends on 1) The exhaust system of claim 1, wherein the inner and outer surfaces form an annular portion that extends angularly around the entire outlet of the tailpipe. ### Claim 4 (depends on 1) The exhaust system of claim 1, wherein the inner and outer surfaces extend angularly around only a portion of the outlet of the tailpipe. ### Claim 5 (depends on 1) The exhaust system of claim 1, wherein the inner surface of the collar curves radially inward. ### Claim 6 (depends on 1) The exhaust system of claim 1, wherein the inner and outer surfaces of the collar cooperate to form an airfoil. ### Claim 7 (depends on 1) The exhaust system of claim 1, wherein an angle between a chord line of the airfoil and a longitudinal axis of the collar is about two degrees. ### Claim 8 (depends on 1) The exhaust system of claim 1, wherein the collar includes at least one support member extending radially between the tailpipe and the inner surface. ### Claim 9 (depends on 8) The exhaust system of claim 8, wherein the collar includes an inner ring attached to the at least one support member and engaging the tailpipe. ### Claim 10 (depends on 1) The exhaust system of claim 1, wherein the outlet of the tailpipe includes a nozzle portion. ### Claim 11 A tailpipe collar comprising: an outer ring configured to least partially surround a tailpipe of a vehicle, the outer ring including an inner surface and an outer surface that cooperate to form an airfoil-shaped cross section; and a spoke connected to the outer ring and extending radially inward therefrom, the spoke adapted to support the outer ring relative to the tailpipe. ### Claim 12 (depends on 11) The tailpipe collar of claim 11, further comprising an inner ring adapted to engage and at least partially surround the tailpipe, the outer ring being disposed radially outward relative to the inner ring, the spoke extending between and attached to the inner and outer rings. ### Claim 13 (depends on 11) The tailpipe collar of claim 11, wherein an outlet of the tailpipe is disposed between an air-inlet and an air-outlet defined by the outer ring and the outer ring receives exhaust gas from the outlet of the tailpipe. ### Claim 14 (depends on 13) The tailpipe collar of claim 13, wherein the outer ring receives air through the air-inlet when the vehicle is moving in a forward direction. ### Claim 15 (depends on 11) The tailpipe collar of claim 11, wherein a first pressure of fluid between the air-inlet and the air-outlet is lower than a second pressure of fluid upstream of the outlet of the tailpipe. ### Claim 16 (depends on 11) The tailpipe collar of claim 11, wherein the outer ring extends angularly around the entire outlet of the tailpipe. ### Claim 17 (depends on 11) The tailpipe collar of claim 11, wherein the outer ring extends angularly around only a portion of the outlet of the tailpipe. ### Claim 18 (depends on 11) The tailpipe collar of claim 11, wherein the inner surface of the outer ring curves radially inward. ### Claim 19 (depends on 11) The tailpipe collar of claim 11, wherein the outer ring is disposed at an angle-of-attack of about two degrees. ### Claim 20 (depends on 11) The tailpipe collar of claim 11, wherein the outer ring is substantially circular.