Water ingress preventing structure for tailpipe

Patent metadata

Field	Value
Publication number	US-10309288-B2
Application number	US-201615521024-A
Country	US
Kind code	B2
Filing date	Jan 22, 2016
Priority date	Jan 26, 2015
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

Disclosed is a water ingress preventive structure for a tailpipe which discharges exhaust gas outside of a vehicle at a terminal of an exhaust passage system. A curved shape is imparted to the tailpipe. A partition is mounted on an inner periphery of a curved portion outward of a curved direction so as to be gradually spaced apart from the inner periphery toward downstream in a direction of flow of the exhaust gas. Thus, a dead end portion is defined by the partition and the inner periphery of the curved portion outward of the curved direction.

First claim

The invention claimed is:

1. A tailpipe for discharge of exhaust gas outside of a vehicle at a terminal of an exhaust passage system, the tailpipe including a water ingress preventive structure, and a curved shape being imparted to said tailpipe, the tailpipe comprising:
a partition mounted on an inner periphery of a curved portion, outward of a curved direction, of said tailpipe so as to be gradually spaced apart from said inner periphery toward downstream in a flow direction of the exhaust gas,
wherein a dead end portion is defined by said partition and said inner periphery of the curved portion outward of the curved direction,
wherein the curved shape is vertically imparted to the tailpipe such that a flow of the exhaust gas from upward to downward is curved into a horizontal direction and is directed to an outlet of the tailpipe, and
wherein a particulate sensor is disposed upstream of the partition in the flow direction of the exhaust gas.

2. The tailpipe as claimed in claim 1 , wherein said curved portion is distended outward of the curved direction such that, in a condition without the partition, a flow passage cross-sectional area at a defined position of the dead end portion is larger than that upstream of the curved portion.

3. The tailpipe as claimed in claim 2 , wherein the flow passage cross-sectional area decreased by the partition is larger than an opening cross-sectional area of an outlet of the tailpipe.

4. The tailpipe as claimed in claim 1 , wherein the flow passage cross-sectional area decreased by the partition is larger than an opening cross-sectional area of an outlet of the tailpipe.

5. The tailpipe according to claim 1 , wherein an upper end of the partition abuts an inner portion of the tailpipe upstream of the curved portion in the flow direction of the exhaust gas, and a lower end of the partition is aligned with the curved portion in the flow direction of the exhaust gas.

6. A tailpipe for discharge of exhaust gas outside of a vehicle at a terminal of an exhaust passage system, the tailpipe including a water ingress preventive structure, and a curved shape being imparted to the tailpipe, the tailpipe comprising:
a drainage opening on a curved portion of the tailpipe at a position outward of a curved direction and opposite to an outlet of said tailpipe; and
a cover for covering, in a spaced-apart relationship, an outer periphery of said curved portion outward of the curved direction so as not to block said drainage opening, said cover extending upstream in a scroll shape from a downstream end of said drainage opening to open a drainage port upstream of said drainage opening,
wherein the curved shape is vertically imparted to the tailpipe such that the flow of the exhaust gas from upward to downward is curved into a horizontal direction and is directed to the outlet, and
wherein a particulate sensor is disposed upstream of the drainage opening in a flow direction of the exhaust gas.

7. The tailpipe as claimed in claim 6 , wherein the flow passage cross-sectional area of the curved portion is gradually reduced toward the outlet of the tailpipe such that ambient air can be taken into the tailpipe through the drainage port due to an effect of reduced pressure resulting from increase in flow rate of the exhaust gas directed to said outlet.

8. The tailpipe as claimed in claim 6 , wherein the flow passage cross-sectional area of the curved portion is gradually reduced toward the outlet of the tailpipe such that ambient air can be taken into the tailpipe through the drainage port due to an effect of reduced pressure resulting from increase in flow rate of the exhaust gas directed to said outlet.

Assignees

• Hino Motors Ltd

Inventors

• Endo Hiroshi
• Tsukisaka Hiroshi

Classifications

• F01N13/085

  having means preventing foreign matter from entering exhaust conduit · CPC title

• F01N2470/30

  Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow · CPC title

• F01N2470/20

  Dimensional characteristics of tubes, e.g. length, diameter · CPC title

• F01N2270/08

  for evacuation of exhaust gases, e.g. in tail-pipes · CPC title

• F01N13/008

  Mounting or arrangement of exhaust sensors in or on exhaust apparatus (sensor arrangements for engine control F02D41/1439) · CPC title