Sensor heat shield structure for a vehicle exhaust system
First Claim
1. An exhaust system for a vehicle comprising:
- an exhaust pipe having an outer surface;
a heat insulating cover mounted to the exhaust pipe and configured to at least partially surround the outer surface of the exhaust pipe, the cover including a body having a planar section defining a surface area, the planar section having an inner surface spaced from the outer surface of the exhaust pipe to define a gap there between;
a reinforcement separate from the cover and mounted to an outer surface of the planar section of the cover body and wherein the reinforcement is confined in the surface area defined by the planar section;
a mounting boss provided in the gap and in direct contact with the inner surface of the planar section; and
an exhaust constituent sensor releasably mounted to the exhaust pipe, a distal end portion of the exhaust constituent sensor being received in the mounting boss and projecting through an opening in the outer surface of the exhaust pipe and into a passage of the exhaust pipe, wherein the direct contact of the mounting boss with the inner surface of the planar section forms a mechanical seal preventing high temperature air from around the exhaust pipe from flowing toward a proximal end portion of the exhaust constituent sensor.
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Accused Products
Abstract
An exhaust system includes an exhaust pipe and a heat insulating cover surrounding an outer surface of the exhaust pipe. The cover includes a planar section defining a surface area. An inner surface of the planar section is spaced from the outer surface to define a gap there between. A separate reinforcement is mounted to the planar section. A mounting boss provided in the gap is in direct contact with the inner surface. An exhaust constituent sensor is mounted to the exhaust pipe. A distal end portion of the sensor is received in the mounting boss and projects through an opening in the outer surface and into an exhaust passage. The direct contact of the mounting boss with the inner surface forms a mechanical seal preventing high temperature air from around the exhaust pipe from flowing toward a proximal end portion of the sensor.
28 Citations
19 Claims
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1. An exhaust system for a vehicle comprising:
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an exhaust pipe having an outer surface; a heat insulating cover mounted to the exhaust pipe and configured to at least partially surround the outer surface of the exhaust pipe, the cover including a body having a planar section defining a surface area, the planar section having an inner surface spaced from the outer surface of the exhaust pipe to define a gap there between; a reinforcement separate from the cover and mounted to an outer surface of the planar section of the cover body and wherein the reinforcement is confined in the surface area defined by the planar section; a mounting boss provided in the gap and in direct contact with the inner surface of the planar section; and an exhaust constituent sensor releasably mounted to the exhaust pipe, a distal end portion of the exhaust constituent sensor being received in the mounting boss and projecting through an opening in the outer surface of the exhaust pipe and into a passage of the exhaust pipe, wherein the direct contact of the mounting boss with the inner surface of the planar section forms a mechanical seal preventing high temperature air from around the exhaust pipe from flowing toward a proximal end portion of the exhaust constituent sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An exhaust system for a vehicle comprising:
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an exhaust pipe having an outer surface; a heat insulating cover mounted to the exhaust pipe and configured to at least partially surround the outer surface of the exhaust pipe; and a mounting boss interconnecting the heat insulating cover and the outer surface of the exhaust pipe, the mounting boss including a first end portion and a second end portion, the first end portion having an annular flange in direct contact with an inner surface of the cover and surrounding a hole located in the cover, the second end portion received in an opening located in the outer surface of the exhaust pipe, wherein the direct contact of the annular flange with the inner surface forms a metal to metal mechanical seal between the mounting boss and the heat insulating cover, the mechanical seal transferring heat generated by the exhaust pipe by conduction to the heat insulating cover, the heat insulating cover acting as a heat sink absorbing and dissipating the transferred heat into an associated surrounding environment. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An exhaust system for a vehicle comprising:
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a heat insulating cover mounted to an exhaust pipe; a cylindrical shaped mounting boss located between an inner surface of the cover and an outer surface of the exhaust pipe, the mounting boss including a first end portion received in a hole located in the cover and having an annular flange in direct contact with the inner surface of the cover and a second end portion opposite the first end portion and received in an opening located in the outer surface of the exhaust pipe; and an exhaust constituent sensor mounted directly to the mounting boss, wherein a surface of the annular flange in direct contact with the inner surface of the heat insulating cover extends parallel to the inner surface to define a continuous metal to metal contact such that the annular flange prevents a flow of high temperature air generated by the exhaust system toward the exhaust constituent sensor, the annular flange further transferring heat generated by the exhaust pipe by conduction to the heat insulating cover, the heat insulating cover acting as a heat sink absorbing and dissipating the transferred heat into an associated surrounding environment. - View Dependent Claims (18, 19)
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Specification