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US 2017/0370270 A1Published application
Water ingress preventing structure for tailpipe
AssigneeHino Motors, Ltd.
InventorsHiroshi ENDO, Hiroshi TSUKISAKA
Life of this patent
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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.
Claims8
1:
- A water ingress preventive structure for a tailpipe for discharge of exhaust gas outside of a vehicle at a terminal of an exhaust passage system, a curved shape being imparted to said 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 direction of flow of the exhaust gas, whereby a dead end portion is defined by said partition and said inner periphery of the curved portion outward of the curved direction.
2:
- The water ingress preventive structure for 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 water ingress preventive structure for 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.
4:
- A water ingress preventive structure for a tailpipe for discharge of exhaust gas outside of a vehicle at a terminal of an exhaust passage system, a curved shape being imparted to 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.
5:
- The water ingress preventive structure for the tailpipe as claimed in claim 4, 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.
6:
- The water ingress preventive structure for the tailpipe as claimed in claim 4, 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.
7:
- The water ingress preventive structure for 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.
8:
- The water ingress preventive structure for the tailpipe as claimed in claim 5, 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.