JP4894738B2 - Tail pipe lighting device - Google Patents

Description

  The present invention relates to a tail pipe illumination device that uses LED to illuminate a tail pipe that discharges exhaust gas from an engine used in vehicles such as automobiles and motorcycles, and ships such as boats.

  In recent years, in vehicles such as automobiles and motorcycles or boats such as boats, the vehicle (or vessel) located behind the vehicle (or vessel) recognizes that the vehicle (or vessel) is present during bright daytime or bad weather, or the vehicle (or vessel) In order to decorate a ship), it has come to be illuminated with LEDs. For example, in Patent Document 1 (Japanese Utility Model Publication No. 6-20145), a tail pipe finisher with illumination is used in order to appeal the location of the exhaust port of an automobile and the discharge of the exhaust gas from the exhaust port to the surroundings. It has been proposed to provide In this case, a cylindrical translucent material is fitted to the outer peripheral surface of the tail pipe finisher, and a light source such as a light emitting diode is attached to one end of the translucent material to perform an illumination function.

  Also, the exhaust pipe is directly or indirectly attached to the exhaust pipe to form a space on the outer periphery of the exhaust pipe, and when viewed from the rear of the free end of the exhaust pipe, the outer periphery of the exhaust pipe emits light and the exhaust gas is emitted. Patent Document 2 (Japanese Patent Application Laid-Open No. 2000-159005) has been proposed that includes a cylindrical body in which a light emitting body to be illuminated is incorporated in a space. In the exhaust outlet lighting device proposed in Patent Document 2, it is possible to enhance the fashionability of appealing to pedestrians and vehicles located behind, as well as enhancing visual sensation at night, as well as at night. It becomes possible.

  In this case, the tail pipe finisher with illumination as shown in Patent Document 1 and the exhaust outlet lighting device as shown in Patent Document 2 do not have a built-in power source for the light source. For this reason, it is necessary to branch the connection cable to the battery disposed in the vehicle body and to perform electrical wiring to the above-described lighting device or the like. And in providing such an electrical wiring, since the electrical wiring work is troublesome and the electrical wiring is exposed to the outside of the vehicle, there is a new problem that the electrical wiring is easily cut off and also causes a failure. .

On the other hand, an exhaust heat power generation apparatus that converts heat of exhaust gas into electrical energy by a thermoelectric conversion module is proposed in, for example, Patent Document 3 (Japanese Patent No. 3637365). Therefore, the exhaust heat power generation device proposed in Patent Document 3 is used as a power source for the tail pipe finisher with illumination as shown in Patent Document 1 and the exhaust lighting device as shown in Patent Document 2. If applied, the wiring work of wiring the connection cable to the battery arranged in the vehicle body is not necessary, and the problem that the electric wiring is cut off and the failure occurs because the electric wiring is not exposed outside the vehicle can be solved. Become.
Japanese Utility Model Publication No. 6-20145 JP 2000-159005 A Japanese Patent No. 3637365

However, in the exhaust heat power generation apparatus 40 as shown in Patent Document 3 described above, A-A section of FIGS. 7 (a) (b) (Here, FIG. 7 (b) FIGS. 7 (a) 2), an inner pipe 41 through which exhaust gas from the engine as a high-temperature heat medium passes, an outer shell 42 surrounding the inner pipe 41, and a heat dissipation member (heat dissipation) held by the outer shell 42 Heat sink) 43, a thermoelectric conversion module 44 held between the heat sink 43 and the inner tube 41, and the like. Here, the heat radiating heat sink 43 serves as a low-temperature source of the thermoelectric conversion module 44, and includes a plurality of cooling fins 43a protruding in the vertical direction and a flat shape extending in the horizontal direction at the base portion of the cooling fins 43a. It is comprised from the part 43b and the level | step-difference part 43c edged and formed in the outer peripheral part of this flat part 43b.

  In this case, in the exhaust heat power generation apparatus 40 as shown in Patent Document 3 described above, the cooling fins 43a of the heat dissipation heat sink 43 are oriented in a direction parallel to the traveling direction of the vehicle. For this reason, the outside air received by the cooling fins 43a of the heat dissipation heat sink 43 during traveling of the vehicle is in a direction parallel to the arrangement direction of the cooling fins 43a, and radiates heat more than when the outside air is blown perpendicular to the arrangement direction of the cooling fins 43a. The problem was that the ability was small. In addition, a windproof cover (not shown) needs to be provided in order to prevent the outside air from running on the high temperature side of the thermoelectric conversion module 44 from being blown off, and the structure is complicated. Also occurred. Further, since the structure absorbs the heat of the exhaust gas without considering the temperature of the exhaust gas, the thermoelectric conversion module 44 may be destroyed when the exhaust gas becomes high temperature.

  Accordingly, the present invention has been made to solve the above-described problems, and uses electric power obtained by converting the heat of exhaust gas into electric energy by a thermoelectric conversion module as a power source of an LED that illuminates the tail pipe. Thus, it is an object of the present invention to provide a tailpipe illumination device that eliminates the need for electrical wiring, has a simple structure, has excellent thermoelectric conversion efficiency, and has excellent durability.

The present invention is a tailpipe illumination device that illuminates a tailpipe that exhausts exhaust gas with LEDs, and is formed so that exhaust gas from the tailpipe flows in and the exhaust gas that flows in is led to a heat sink for heat absorption. A heat sink for heat absorption having a heat absorption fin disposed in the duct portion and absorbing heat of exhaust gas flowing into the duct portion, and a heat radiation fin disposed to face the heat sink for heat absorption A heat sink for heat dissipation, a thermoelectric conversion module sandwiched between the heat sink for heat absorption and the heat sink for heat dissipation, an electric circuit section having a DC / DC converter for converting the voltage generated by the thermoelectric conversion module and a protection circuit, And an illumination unit having an LED that is turned on by an output from the electric circuit unit . The duct portion includes an opening into which exhaust gas discharged from the tail pipe flows, and a flow passage formed so that the exhaust gas is perpendicular to the traveling direction, and the exhaust gas is exhausted from the heat absorption fins. The heat-absorbing fins are arranged in the flow path so that they are perpendicular to each other, and the heat-radiating fins are arranged in front of the heat-radiating fins so that the outside air is in parallel with the heat-radiating fins. The heat-absorbing fin is disposed behind the heat-radiating fin .

With such a configuration, the voltage generated by the thermoelectric conversion module is converted by the electric circuit unit, and the LED is turned on by the output. It becomes possible to decorate with. In this case, the thermoelectric conversion module can efficiently generate electric power by the heat absorption from the heat absorption heat sink and the heat dissipation from the heat sink disposed in the duct portion. Since the LED is turned on using the generated power, it is not necessary to branch out a cable connected to a battery attached to a vehicle or the like and take out the power.
This makes it possible to easily and easily illuminate the tail pipe with the LED even if it is retrofitted (not only when purchasing a new car but also after purchase) without performing complicated electrical wiring. In addition, since the power consumption of the battery attached to the vehicle or the like can be reduced, eco-energy can be achieved.

Here, the duct portion includes an opening into which exhaust gas discharged from the tail pipe flows, and a flow passage formed so that the exhaust gas is perpendicular to the traveling direction, and is exhausted from the heat absorption fins. The heat-absorbing fins are arranged in the flow path so that the gas hits vertically, the heat-radiating fins are arranged so that the outside air hits parallel to the heat-radiating fins, and the heat-radiating fins are arranged in front of the traveling direction. In addition, it is desirable that a heat absorption fin is disposed behind the heat dissipation fin. As a result, the heat sink for heat dissipation becomes a wind barrier for the outside air coming from the front in the traveling direction, so that the outside air does not escape to the heat absorption side (high temperature side) of the thermoelectric conversion module, and heat is efficiently converted. It becomes possible. Further, since the outside air coming from the front in the traveling direction is blown perpendicularly to the base plate of the heat sink for heat dissipation (see FIGS. 1A and 1C), a high heat dissipation capability is obtained.
In this case, if a cover that covers the duct part is disposed at a predetermined distance from the duct part, it is possible to prevent a hand or the like from coming into direct contact with the duct part, and to prevent the occurrence of burns or the like. become able to. Moreover, since a space part will be produced between a cover and a duct part, it will become possible to arrange | position an electric circuit part etc. in the produced space part. Furthermore, the heat insulation effect by the space part (air layer) generated between the cover and the duct part can further reduce the heat dissipated outside the duct part, so that the thermoelectric conversion can be performed more efficiently. become able to.

Further, the duct section is formed of a metal member, the or at least one of the inside or outside is coated with a highly heat-resistant resin sheet, or when the whole is formed of a high heat-resistant resin sheet, the exhaust gas The heat can be blown to the heat-absorbing fins without escaping outside the duct portion. Thereby, thermoelectric conversion can be performed efficiently. Further, when the electric circuit portion is covered with the high heat-resistant resin sheet, the electric circuit portion can be protected from a high temperature.

In this case, as the high heat resistant resin sheet, it is desirable to select and use any one of a polyimide sheet, a polyetherimide sheet, and a polyethersulfone sheet.
Further, when a flow rate switching mechanism made of bimetal or shape memory alloy is provided in the duct portion, when the exhaust gas becomes high temperature (for example, 300 ° C. or more) by this flow rate switching mechanism, the high temperature exhaust gas is moved outside the duct portion. As a result, the thermoelectric conversion module can be prevented from being destroyed due to high temperature.

  If a connector for supplying the output from the electric circuit section to an external device is provided, a cable connected to the external device such as a lighted license plate frame or a sub-battery is connected to such a connector. The thermoelectric conversion module can be used as a power source for an external device such as a lighted license plate frame or a sub-battery.

In the tailpipe lighting device of the present invention, since the electric power obtained by thermoelectrically converting the heat of the exhaust gas by the thermoelectric conversion module is supplied to the lighting device, it is not necessary to branch the cable connected to the battery and take out the power. . For this reason, it is possible to turn on the lighting device only by integrating the thermoelectric conversion module unit and the lighting unit, that is, by simply attaching the main body to the tail pipe without exposing the electrical wiring to the outside. Accordingly, excellent design, and it is possible to provide a tail pipe illumination device to help visibility heightened accident prevention I from the surroundings.

  Hereinafter, an embodiment in which the tailpipe lighting device of the present invention is applied to a tailpipe of an automobile will be described. However, the present invention is not limited to this embodiment, and the object of the present invention is not changed. It is possible to implement by appropriately changing within the range. 1 is a diagram schematically showing the tail pipe illumination device of the first embodiment, and FIG. 1 (a) is a sectional view schematically showing a transverse section of the tail pipe illumination device, and FIG. FIG. 1A is a cross-sectional view schematically showing an AA cross section (longitudinal cross section) of FIG. 1A, and FIG. 1C is a schematic view of a BB cross section (vertical cross section) of FIG. FIG. FIG. 2 is a cross-sectional view schematically showing a main part of the thermoelectric conversion module shown in FIG. FIG. 3 is a side view showing a side surface of the tail pipe illuminating device according to the first embodiment shown in FIG. FIG. 4 is a cross-sectional view schematically showing a state in which a flow rate switching mechanism is provided in the tailpipe illumination device of the first embodiment shown in FIG.

1. Example 1
The tailpipe lighting device 10 according to the first embodiment is arranged so as to face the duct part 11 attached to the tailpipe 20, the heat sink 12 for heat absorption disposed in the duct part 11, and the heat sink 12 for heat absorption. A heat sink 13 for heat dissipation, a thermoelectric conversion module 14 sandwiched between the heat sink 12 for heat absorption and the heat sink 13 for heat dissipation, and a cover 15 disposed so as to surround the duct portion 11. Further, in the space between the duct portion 11 and the cover 15, an electric circuit portion 16 having a DC / DC converter and a protection circuit for converting a voltage generated by the thermoelectric conversion module 14, and an electric circuit portion 16. And an illuminating unit 17 having an LED that is lit by the output of.

  Here, the duct portion 11 includes an opening portion 11a into which the exhaust gas discharged from the tail pipe 20 flows, and a flow passage 11b in which the traveling direction of the exhaust gas is perpendicular to the traveling direction of the automobile. I have. And the heat sink 12 for heat absorption is arrange | positioned in the duct part 11 so that the heat absorption fin 12b of the heat sink 12 for heat absorption may become a perpendicular | vertical direction with respect to the advancing direction of exhaust gas. Since the duct portion 11 is formed of a high heat-resistant resin sheet such as a polyimide sheet, the heat of the exhaust gas can be blown to the heat-absorbing fins 12b of the heat-absorbing heat sink 12 without releasing the heat of the exhaust gas to the outside. Has been made.

  In this case, as shown in FIG. 4, some of the duct members in the duct portion 11 may have an opening 11 d formed in a part of the duct member when the exhaust gas reaches a high temperature (for example, 300 ° C. or higher). A flow rate switching mechanism 11c made of bimetal or shape memory alloy is provided. In addition, a large number of exhaust ports 15a are disposed in a part of the cover 15 disposed at a position facing the flow rate switching mechanism 11c. By providing such a flow rate switching mechanism 11c, when the exhaust gas becomes a high temperature (for example, 300 ° C. or more), the bimetal or the shape memory alloy that becomes the flow rate switching mechanism 11c is deformed by the high temperature exhaust gas, and the opening 11d is formed. The high temperature exhaust gas is discharged to the outside through the exhaust port 15 a formed in the duct portion 15. Thereby, it can prevent that the thermoelectric conversion module 14 becomes high temperature and is destroyed.

  The high heat-resistant resin sheet is not limited to the polyimide sheet described above, and a polyetherimide sheet or a polyethersulfone sheet may be used instead of the polyimide sheet. Further, instead of the high heat-resistant resin sheet, the duct portion 11 is formed of a metal member such as iron or stainless steel, and the inside or outside of these metal members is formed of a polyimide sheet, a polyetherimide sheet, a polyethersulfone sheet, or the like. You may make it use by coat | covering with a high heat resistant resin sheet.

  The endothermic heat sink 12 includes an endothermic heat sink base plate 12a and a number of endothermic fins 12b erected in a direction perpendicular to the endothermic heat sink base plate 12a. An endothermic heat sink 12 is disposed in the duct portion 11 so that the endothermic fins 12b are perpendicular to the exhaust gas traveling direction, and the endothermic heat sink base plate 12a is disposed on the endothermic side of the thermoelectric conversion module 14. It is joined to. In this case, the endothermic heat sink base plate 12a is disposed behind the heat sink 13 (behind the traveling direction of the automobile). Thereby, the heat sink 13 for heat radiation becomes a wind barrier for the outside air coming from the front in the traveling direction of the automobile. As a result, since heat does not escape due to outside air hitting the heat absorption side (high temperature side) of the thermoelectric conversion module 14, thermoelectric conversion can be performed efficiently.

  On the other hand, the heat sink 13 for heat dissipation is composed of a heat sink base plate 13a and a large number of heat radiation fins 13b erected in the vertical direction from the heat sink base plate 13a. A heat sink base plate 13 a is joined to the heat dissipation side of the thermoelectric conversion module 14. In this case, the heat sink 13 for heat dissipation is disposed so as to be in front of the heat sink 12 for heat absorption (forward with respect to the traveling direction of the automobile), and a large number of heat dissipating fins 13b are provided. In addition, the heat sink 13 for heat dissipation is arrange | positioned so that many radiation fins 13b may become a direction parallel to the advancing direction of a motor vehicle. As a result, the outside air coming from the front in the traveling direction of the vehicle is blown perpendicularly to the heat sink base plate 13a of the heat sink 13 when the vehicle is traveling, so that a high heat dissipation capability is obtained.

  As shown in FIG. 2, the thermoelectric conversion module 14 includes an upper substrate 14a made of ceramics, a lower substrate 14b made of ceramics, and electrodes 14c made of copper films formed on the substrates 14a and 14b. 14d, a p-type semiconductor compound element (thermoelectric element) 14e bonded to these electrodes 14c and 14d, and an n-type semiconductor compound element (thermoelectric element) 14f. A plurality of these two types of thermoelectric elements 14e and 14f are arranged and formed so as to be electrically connected in series alternately by the electrodes 14c and 14d.

In this case, the P-type semiconductor compound element uses, for example, a material composed of three elements of Bi—Sb—Te (specifically, for example, one having a composition represented by Bi _0.5 Sb _1.5 Te ₃ ). It is formed by a hot press sintering method so as to have a size of 1 mm × 1 mm. On the other hand, the N-type semiconductor compound element uses, for example, a material composed of four elements of Bi—Sb—Te—Se (specifically, for example, a composition represented by Bi _1.9 Sb _0.1 Te _2.6 Se _0.4 ). It is formed by a hot press sintering method so as to have a size of 1 mm × 1 mm × 1 mm. Each of these two types of thermoelectric elements 14e and 14f is used to form a size of 40 mm × 40 mm × 4 mm.

  The cover 15 is disposed so as to surround the duct portion 11 with a predetermined interval, and prevents a hand or the like from coming into direct contact with the duct portion 11 to prevent the occurrence of burns or the like. I have to. Further, by providing the cover 15, a space portion is generated between the cover 15 and the duct portion 11, so that the electric circuit portion 16 and the like can be arranged in the generated space portion. Furthermore, the heat insulation effect by the space part (air layer) generated between the cover 15 and the duct part 11 makes it possible to further reduce the heat dissipated out of the duct part 11, so that the thermoelectric conversion can be performed more efficiently. Will be able to do.

  The electric circuit unit 16 includes a DC / DC converter that converts the voltage generated by the thermoelectric conversion module 14 and a protection circuit (not shown). The electric circuit unit 16 is provided in the illumination unit 17 by an output from the electric circuit unit 16. The lighted LED is turned on. In this case, the electric circuit portion 16 is covered with a high heat-resistant resin sheet 16a made of a polyimide sheet, a polyetherimide sheet, a polyether sulfone sheet, etc., and is designed to protect the electric circuit portion 16 from high temperatures. Yes. And the electric circuit part 16 and the thermoelectric conversion module 14 are connected by the cable 16b.

  A part of the cover 15 around the electric circuit unit 16 is provided with a connector (not shown) for supplying the output from the electric circuit unit 16 to an external device. By providing such a connector and connecting a lead wire connected to an external device such as an illuminated license plate frame or sub-battery to the connector, the thermoelectric conversion module 14 is connected to an illuminated license plate frame or sub-battery (this In this case, it can be used as a power source for an external device such as a battery used for outdoor use.

  The illuminating unit 17 is disposed behind the electric circuit unit 16 (with respect to the traveling direction of the automobile), and includes an LED that is turned on by an output from the electric circuit unit 16. In part, a window portion 17a for lighting is provided. And the electrical wiring connected to the electric circuit part 16 is connected to LED. As a result, the electrical wiring can be connected to the LED without being exposed to the outside. The light window 17a is a transparent window so that light emitted from the LED is emitted to the outside of the cover 15. A lens may be provided in the lamp window 17a. In this case, the mounting position of the illumination unit 17 may be any position of the cover 15, but it is necessary to provide the lighting unit 17 at a position behind the automobile (relative to the traveling direction of the automobile) for visual recognition from the following vehicle.

<Attaching the tailpipe lighting device to the tailpipe>
Next, an example in which the tail pipe lighting device 10 according to the first embodiment as described above is attached to the tail pipe 20 of the automobile will be described below with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view schematically showing a state in which the tailpipe illumination device 10 of the first embodiment is attached to the tailpipe 20 of the automobile using an example fixture. FIG. 6 shows a fixture using another example and a state where the fixture is used. FIG. 6A shows the tail pipe lighting device 10 according to the first embodiment attached to the tail pipe 20 using this fixture. FIG. 6B is a front view schematically showing the fixture.

  The fixture 18 shown in FIG. 5 is a plug-in fixture, and has a fixed portion 18a formed in a rectangular shape in plan view, and a fitting groove having a U-shaped cross section on the end side from the fixed portion 18a. An attachment portion 18b in which 18c is formed, and a bolt 18d that is inserted into a screw hole formed in the attachment portion 18b and fixes the attachment portion 18b to the tail pipe 20. In this case, the tip of the tail pipe 20 is fitted into a fitting groove 18c having a U-shaped cross section of the attachment portion 18b.

  Then, one end of the fixture 18 is attached to the opening 11a of the duct portion 11 of the tailpipe illumination device 10 (note that although not shown, a member for attaching the fixture is provided in the opening 11a) and bolts Alternatively, after fixing by welding, the tail pipe 20 is fitted into the fitting groove 18c of the attachment portion 18b formed at the other end. Thereafter, the tail pipe lighting device 10 can be fixedly attached to the tail pipe 20 by screwing the bolt 18d into the screw hole formed in the attachment portion 18b. By using such a fixture 18, even if the inner diameter (or outer diameter) of the opening 11a of the duct portion 11 and the outer diameter (or inner diameter) of the tail pipe 20 do not completely coincide with each other, the tail pipe illumination device is provided. 10 can be attached to the tail pipe 20.

  On the other hand, the fixture 19 shown in FIG. 6 is a hose band type fixture, and includes a main body portion 19a that is attached and fixed to the opening 11a of the duct portion 11 of the tailpipe illumination device 10, and a fastening band 19b. Here, a housing 19c is formed at the distal end of the main body 19a, and claws that are engaged with locking grooves formed at appropriate intervals at the distal end of the fastening band 19b in the housing 19c are formed on the lower surface. A protruding locking piece 19d is accommodated. In this case, the inner diameter of the tightening band 19 b is formed to be larger than the outer diameter of the tail pipe 20.

  Then, one end of the main body portion 19a of the fixture 19 is attached to the opening 11a of the duct portion 11 of the tailpipe lighting device 10 (note that although not shown, a member for attaching the fixture is provided in the opening 11a. ) And fixed by bolts or welding, and then the fastening band 19b formed at the other end is fitted into the tail pipe 20. Thereafter, the tail pipe lighting device 10 can be fixedly attached to the tail pipe 20 by rotating the locking piece 19d to reduce the diameter of the fastening band 19b. By using such a fixture 19, even if the inner diameter (or outer diameter) of the opening 11a of the duct portion 11 and the outer diameter (or inner diameter) of the tail pipe 20 do not completely coincide with each other, the tail pipe illumination device is provided. 10 can be attached to the tail pipe 20.

  In the above-described first embodiment, the example in which the heat sink 12 for heat absorption, the heat sink 13 for heat dissipation, and the thermoelectric conversion module 14 are provided on both sides of the duct portion 11 centering on the tail pipe 20 has been described. The heat sink 12 for heat absorption, the heat sink 13 for heat dissipation, and the thermoelectric conversion module 14 may be disposed only on one side of the duct portion 11.

As described above, Oite tailpipe illumination apparatus 1 0 of the present invention, for applying electric power in the thermoelectric conversion module 1 4 is obtained by the heat of the exhaust gas is converted thermoelectric the LED lighting unit 1 7, battery It is no longer necessary to branch out the cable connected to the cable and take out the power. For this reason, it is possible to light the LED without exposing the electrical wiring to the outside simply by attaching the tail pipe lighting device 10 of the present invention to the tail pipe 20. As a result, it is possible to provide a tailpipe illumination device that is excellent in design and has high visibility from the surroundings and is useful for preventing accidents.

  In the above-described embodiment, the example in which the tailpipe lighting device of the present invention is mounted on an automobile has been described. However, the tailpipe lighting device of the present invention is not limited to a car, and a vehicle such as a motorcycle or a ship such as a boat. It is obvious that the present invention can be applied to a tail pipe that exhausts exhaust gas from an engine used for the above.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the tail pipe illuminating device of Example 1 of this invention, Fig.1 (a) is sectional drawing which shows the cross section of a tail pipe illuminating device typically, FIG.1 (b) is shown. It is sectional drawing which shows typically the AA cross section (vertical cross section) of Fig.1 (a), FIG.1 (c) shows typically the BB cross section (vertical cross section) of Fig.1 (a). It is sectional drawing. It is sectional drawing which shows typically the principal part of the thermoelectric conversion module shown in FIG. It is the side view which shows the side surface which looked at the tail pipe illuminating device of Example 1 shown in FIG. 1 from the tail pipe side, and the partially broken side surface. It is sectional drawing which shows typically the state which provided the flow volume switching mechanism in the tailpipe illuminating device of Example 1 shown in FIG. It is sectional drawing which shows typically the state which attached the tailpipe illuminating device 10 of Example 1 to the tailpipe 20 using the fixture of an example. FIG. 6A schematically shows a state in which the tailpipe lighting device 10 of the first embodiment is attached to the tailpipe 20 using this fixture. FIG. 6B is a cross-sectional view schematically showing the fixture. FIG. 7 (a) is a perspective view schematically showing a waste heat power generation apparatus, and FIG. 7 (b) is a perspective view schematically showing the conventional exhaust heat power generation apparatus. It is sectional drawing which shows an AA cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Tail pipe lighting device, 11 ... Duct part, 11a ... Opening part, 11b ... Flow path, 11c ... Flow rate switching mechanism, 11d ... Opening, 12 ... Heat sink for heat absorption, 12a ... Base plate for heat absorption heat sink, 12b ... Radiation fin, DESCRIPTION OF SYMBOLS 13 ... Heat sink for heat dissipation, 13a ... Base plate for heat sink heat sink, 13b ... Radiation fin, 14 ... Thermoelectric conversion module, 14a ... Upper substrate, 14b ... Lower substrate, 14c ... Electrode, 14e ... Thermoelectric element, 14f ... Thermoelectric element, 15 ... Cover, 15a ... Exhaust port, 16 ... Electric circuit part, 16a ... High heat resistant resin sheet, 16b ... Cable, 17 ... Lighting part, 17a ... Lighting window part, 18 ... Fitting, 18a ... Fixing part, 18b ... Attachment Part, 18c ... fitting groove, 18d ... bolt, 19 ... fixture, 19a ... main body part, 19b ... band, 19c ... Ujingu, 19d ... locking pieces, 20 ... tail pipe

Claims (7)

A tail pipe lighting device that illuminates the tail pipe that discharges exhaust gas with LEDs,
A duct portion formed so that the exhaust gas from the tail pipe flows in and the exhaust gas flowing in is led to the heat sink for heat absorption;
An endothermic heat sink having an endothermic fin that is disposed in the duct portion and absorbs heat of the exhaust gas flowing into the duct portion;
A heat dissipating heat sink having heat dissipating fins arranged to face the heat absorbing heat sink;
A thermoelectric conversion module sandwiched between the heat sink for heat absorption and the heat sink for heat dissipation;
An electric circuit unit having a DC / DC converter and a protection circuit for converting a voltage generated by the thermoelectric conversion module;
Rutotomoni an illumination portion having a LED that lights by the output from the electric circuit portion,
The duct portion includes an opening into which the exhaust gas discharged from the tail pipe flows, and a flow passage formed so that the exhaust gas is perpendicular to the traveling direction,
The endothermic fin is disposed in the flow passage so that the exhaust gas hits the endothermic fin perpendicularly;
The heat dissipating fins are arranged so that the outside air is parallel to the heat dissipating fins, and
The tailpipe illumination device according to claim 1, wherein the heat radiating fin is disposed in front of the traveling direction, and the heat absorbing fin is disposed behind the heat radiating fin .   The tail pipe illumination device according to claim 1, wherein a cover that covers the duct portion is disposed at a predetermined interval from the duct portion. Said duct portion is formed of a metal member, characterized in that the or inside or at least one of the outside is coated with a highly heat-resistant resin sheet, or all of which is formed of a high heat-resistant resin sheet The tailpipe illumination device according to claim 1 or 2.   The tail pipe illumination device according to any one of claims 1 to 3, wherein the electric circuit portion is covered with a high heat resistant resin sheet.   The tail pipe illumination device according to claim 3 or 4, wherein the high heat-resistant resin sheet is any one of a polyimide sheet, a polyetherimide sheet, and a polyether sulfone sheet.   A flow rate switching mechanism made of bimetal or shape memory alloy is disposed in the duct portion, and when the exhaust gas becomes higher than a predetermined temperature by the flow rate switching mechanism, the high temperature exhaust gas is discharged out of the duct portion. The tailpipe lighting device according to any one of claims 1 to 5, wherein the tailpipe lighting device is configured as described above. The tailpipe illumination device according to any one of claims 1 to 6 , further comprising a connector for supplying an output from the electric circuit unit to an external device.

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