JP2019130926A - Heat countermeasure structure of on-vehicle electronic apparatus - Google Patents

Abstract

To provide a heat countermeasure structure of an on-vehicle electronic apparatus for both of rise in an ambient temperature of an air conditioner duct and rise in a temperature due to self-heating at operation of the on-vehicle electronic apparatus.SOLUTION: A heat countermeasure structure of an on-vehicle electronic apparatus 1 comprises: an air conditioner duct 23 which is arranged at the periphery of the on-vehicle electronic apparatus 1 and introduces air conditioning wind to an air outlet provided toward a cabin; a heat insulation plate 26 which is provided at least between the air conditioner duct and the on-vehicle electronic apparatus and is arranged around a casing of the on-vehicle electronic apparatus; and radiation means K which radiates self-heating from the on-vehicle electronic apparatus on the upper surface side of the casing of the on-vehicle electronic apparatus.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a heat countermeasure structure for in-vehicle electronic devices such as audio devices and navigation system devices mounted on a vehicle instrument panel.

  An operation unit of an audio device, a navigation system device, or an air conditioner system is generally arranged on an instrument panel in the center in the vehicle width direction in a passenger car.

  In addition, an air-conditioning air outlet of the air-conditioning system is provided at the center of the instrument panel, and an air-conditioning air-conditioning duct is disposed in the instrument panel. For this reason, the ambient temperature of the air-conditioner duct rises when heating is used in winter. Due to the increase in the ambient temperature and the temperature increase due to self-heating during operation of these electronic devices, the temperature protection function is activated and reset in the electronic devices, and the internal substrate element junction temperature is exceeded and a failure occurs. There is concern about being connected.

  For example, Patent Document 1 is known as a heat countermeasure for a navigation system or the like mounted on an instrument panel. In Patent Document 1, a navigation system mounted on an instrument panel is incident from a windshield. It has been shown that a thermal protection means is provided to prevent the temperature of electronic devices of the navigation system from rising above a predetermined temperature due to solar radiation from sunlight.

  As an example of this heat protection means, a part of the air-conditioning air is branched and the navigation system electronic device is arranged and cooled in the branch duct, and heat insulation is provided above the electronic device of the navigation system. It is shown that a sheet is disposed.

JP 2002-52957 A

  However, the above-mentioned patent document 1 is only a thermal protection means for preventing the temperature of the electronic device of the navigation system from rising above a predetermined temperature due to solar radiation from sunlight incident from the windshield.

  Since an air-conditioning air-conditioning duct is arranged in the instrument panel, the ambient temperature of the air-conditioning duct rises when heating is used in winter. Also, the temperature of the electronic device rises due to self-heating during operation of the electronic device. Patent Document 1 does not suggest such a heat countermeasure that simultaneously satisfies the countermeasure against the increase in the ambient temperature of the air-conditioner duct and the temperature increase due to self-heating during operation of the electronic device.

  Accordingly, in view of such problems, at least one embodiment of the present invention provides a heat countermeasure structure for an in-vehicle electronic device against both an increase in ambient temperature of an air conditioner duct and a temperature increase due to self-heating during operation of the in-vehicle electronic device. The purpose is to provide.

  (1) Invented to achieve the above-described object, at least one embodiment of the present invention is a heat countermeasure structure for an in-vehicle electronic device mounted on an instrument panel disposed in front of a vehicle interior. An air-conditioning duct that is disposed around the vehicle-mounted electronic device and guides conditioned air to an outlet provided toward the vehicle interior, and is provided at least between the air-conditioning duct and the casing of the vehicle-mounted electronic device. A heat insulating plate disposed around a casing of the in-vehicle electronic device; and heat radiating means for radiating self-heating from the in-vehicle electronic device to the upper surface side of the casing of the in-vehicle electronic device. To do.

  According to the above configuration (1), the ambient temperature of the air conditioner duct increases at the maximum use time of heating such as in winter due to the heat insulating plate provided at least between the air conditioner duct and the casing of the in-vehicle electronic device. Prevents thermal effects on audio system equipment.

  Furthermore, by releasing the self-heating from the on-vehicle electronic device to the upper side of the casing of the on-vehicle electronic device, the temperature rise due to the self-heating can be prevented by releasing the heat upward to the inside of the instrument panel.

  As described above, the structure having both the heat insulating function from the air-conditioner duct by the heat insulating plate and the self-heating heat dissipation function by the heat radiating means, the temperature protection function of the in-vehicle electronic equipment is improved by the increase of the ambient temperature and the self-heating of these in-vehicle electronic equipment. It is activated and reset, and it is prevented from exceeding the junction temperature of the internal substrate element and leading to failure.

  (2) Further, in some embodiments, the heat dissipating means is configured such that the heat insulating plate is not provided on the upper surface side of the casing of the in-vehicle electronic device, and is configured in an open state.

  According to the configuration (2), since the heat insulating plate is not provided on the upper surface side of the casing of the in-vehicle electronic device and is in an open state, a heat dissipation effect by self-heating is reliably obtained.

  (3) In some embodiments, the heat dissipation means is configured by a heat dissipation opening formed in the heat insulating plate provided on the upper surface side of the casing of the in-vehicle electronic device. .

  According to the configuration (3), since the heat radiating means is constituted by the heat radiating opening formed in the heat insulating plate provided on the upper surface side of the casing of the in-vehicle electronic device, the heat radiating can be performed while maintaining the heat insulating effect. Done.

  (4) In some embodiments, a heat radiating member is interposed between the heat insulating plate and the in-vehicle electronic device, and the heat radiating member protrudes outside the heat insulating plate on the front side of the casing. It has the part.

  According to the configuration (4), since the heat dissipation member is interposed between the heat insulating plate and the vehicle-mounted electronic device, and the heat dissipation member has the heat dissipation portion protruding outside the heat insulating plate on the front side of the casing, Both the heat dissipation effect is reliably exhibited.

  (5) Further, in some embodiments, a decorative design panel is installed on the front side of the heat radiating portion.

  According to the configuration (5), since the heat radiating portion of the heat radiating member is covered with the design panel, the appearance of the heat radiating portion from the vehicle interior side is prevented from being deteriorated, and further, the front side of the in-vehicle electronic device due to the heat radiated from the heat radiating portion is prevented. High temperature can be prevented.

  According to at least one embodiment of the present invention, by the structure having both the heat insulating function from the air conditioner duct by the heat insulating plate and the self-heating heat dissipation function by the heat radiating means, due to the increase in ambient temperature and the self-heating of these in-vehicle electronic devices, The temperature protection function of the in-vehicle electronic device is activated and reset, and it is prevented from exceeding the junction temperature of the internal substrate element and leading to a failure.

It is the outline outline figure which looked at the in-vehicle electronic equipment to which the heat countermeasure structure concerning one embodiment of the present invention was applied from the vehicle interior side. 1 is a schematic perspective view of an overall configuration of a heat countermeasure structure of an in-vehicle electronic device according to an embodiment of the present invention. It is a cross-sectional schematic diagram in the AA arrow in FIG. 1 is a schematic perspective view of an overall configuration of a heat countermeasure structure of an in-vehicle electronic device according to an embodiment of the present invention. It is a cross-sectional schematic diagram in the BB arrow view in FIG. 1 is a schematic perspective view of an overall configuration of a heat countermeasure structure of an in-vehicle electronic device according to an embodiment of the present invention. It is a cross-sectional schematic diagram in the CC arrow in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
The up / down, left / right, and front / rear directions are defined in a state in which the in-vehicle electronic device is mounted and the vehicle interior side is front and the front is viewed from the inside of the in-vehicle electronic device.

A heat countermeasure structure for an in-vehicle electronic device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a schematic external view of an in-vehicle electronic device to which a heat countermeasure structure is applied as viewed from the vehicle interior side.

  An instrument panel 3 is arranged extending in the vehicle width direction in front of the driver's seat. A glove box 5 is provided on the passenger seat side of the instrument panel 3, and an instrument panel 9 is provided in front of the steering wheel 7 on the driver seat side.

  A navigation / audio unit (on-vehicle electronic device) 1 is arranged at the center of the instrument panel 3 in the vehicle width direction. The navigation / audio unit 1 has an audio and a navigation system integrated with each other, and displays various information of the audio and the navigation system to the occupant and also has a touch panel function that is touch-operated by the occupant. Is provided facing the passenger compartment.

  An air outlet 19 for blowing conditioned air from a vehicle air-conditioning system (not shown) is provided below the display 11 of the navigation / audio unit 1. An operation unit 15 of the air conditioner system is provided below the air outlet 19.

  FIG. 2 shows an outline of the internal structure of the instrument panel 3 on which the navigation / audio unit 1 is arranged, and shows a front perspective view. 3 is a schematic cross-sectional view taken along the line AA in FIG.

  As shown in FIGS. 2 and 3, the rear surface 17b of the casing 17 of the navigation / audio unit 1 (the vehicle interior side is referred to as the front surface 17a side and the opposite side is referred to as the rear surface 17b side). A rear air-conditioning duct 21 that guides conditioned air from the air-conditioning system to the air outlet 19 is arranged in the vehicle width direction, and is connected to the rear air-conditioning duct 21 on the lower surface 17c side of the casing 17 of the navigation / audio unit 1 A lower air-conditioning duct 23 having a blow-out opening 19 for blowing the conditioned air diverted from the side air-conditioning duct 21 into the vehicle interior is provided in the vehicle front-rear direction.

A heat insulating plate 25 is disposed between the rear surface 17b of the casing 17 of the navigation / audio unit 1 and the rear air conditioner duct 21 so as to cover the rear surface 17b of the casing 17 as shown in FIG. Further, a heat insulating plate 26 is disposed between the lower surface 17c of the casing 17 of the navigation / audio unit 1 and the lower air conditioner duct 23 so as to cover the lower surface 17c of the casing 17 as shown in FIG.
Further, a heat insulating plate 27 is disposed so as to cover the left and right side surfaces 17 d of the casing 17 of the navigation / audio unit 1.

The heat insulating plate 25 on the rear surface 17b side of the casing 17, the heat insulating plate 26 on the lower surface 17c side, and the heat insulating plate 27 on the side surface 17d side are connected, and as shown in FIG. The other surfaces except for the upper surface 17e side are covered with heat insulating plates 25, 26, 27.
The open portion on the front surface 17a side and the upper surface 17e side of the casing 17 that is not covered with the heat insulating plates 25, 26, and 27, in particular, the open portion K on the upper surface 17e side constitutes a heat radiation means.

  Moreover, the heat insulating plates 25, 26, and 27 are made of a heat insulating sheet having high heat insulating properties such as urethane foam. Further, the heat insulating plate 25 on the rear surface 17b side is formed to be thicker than the heat insulating plate 26 on the lower surface 17c side and the heat insulating plate 27 on the side surface 17d side.

  Due to the plate thickness relationship, when heating is used in winter, the lower air conditioner duct 23 is a duct having a structure that branches from the rear air conditioner duct 21, and the rear air conditioner duct is lower than the lower air conditioner duct. Since it is closer to the heater core than 23, the ambient temperature of the rear air conditioner duct 21 is more likely to rise than the lower air conditioner duct 23, and a heat insulating effect corresponding to the increasing tendency of the ambient temperature of such a duct can be obtained.

  Further, as shown in FIG. 3, between the heat insulating plates 25, 26, 27 and the casing 17 of the navigation / audio unit 1, between the heat insulating plate 25 and the rear air conditioner duct 21, and between the heat insulating plate 26 and the lower side. Although described in the structure in which the air layer S is interposed between the air conditioner duct 23, the heat insulating plates 25, 26, 27 and the casing 17 of the navigation / audio unit 1 are insulated without the air layer S being interposed. The plate 25 and the rear air conditioner duct 21, and the heat insulating plate 26 and the lower air conditioner duct 23 may be arranged so as to contact each other.

  Although the heat insulation effect can be improved by interposing the air layer S, it is necessary to secure the air layer S in addition to the accommodation space of the navigation / audio unit 1, and therefore the instrument panel 3 is enlarged. Such an increase in size of the instrument panel 3 can be suppressed by arranging it in direct contact without interposing the air layer S as described above.

  According to the configuration of the above embodiment, the ambient temperature of the rear air-conditioner duct 21 and the lower air-conditioner duct 23 is increased by the heat insulating plates 25, 26, and 27 at the maximum use time of heating in winter or the like, and the navigation / audio unit 1 can be prevented from being affected by heat.

  Further, since no heat insulating plates are provided on the front surface 17a side and the upper surface 17e side of the casing 17 of the navigation / audio unit 1, self-heating from the navigation / audio unit 1 is caused by the front surface 17a side and the upper surface 17e side. Can dissipate heat. As a result, temperature rise due to self-heating can also be prevented.

  In this way, the rear air conditioner has a heat insulating function by the heat insulating plates 25, 26, 27 and a heat dissipation function from the front surface 17a and the upper surface 17e of the casing 17 where the heat insulating plates 25, 26, 27 are not provided. The temperature protection function is activated and reset by the increase in the ambient temperature of the duct 21 and the lower air conditioner duct 23 and the self-heating during the operation of the navigation / audio unit 1, and the breakdown exceeds the junction temperature of the internal substrate element. Can be prevented.

Next, an embodiment is shown in FIGS.
FIG. 4: shows the general | schematic perspective view of the whole structure of the heat countermeasure structure of the vehicle-mounted electronic device which concerns on one Embodiment. 5 is a schematic cross-sectional view taken along the line BB in FIG.

  In the embodiment shown in FIGS. 4 and 5, the heat radiation means is constituted by the front surface 17 a and the upper surface 17 e of the casing 17 not covered with the heat insulating plates 25, 26, 27. The upper surface 17e side of the casing 17 is also covered with a heat insulating plate 28, and a heat radiation opening 29 is provided in the heat insulating plate 28 on the upper surface 17e side. Other configurations are the same as those of the embodiment of FIGS.

  As shown in FIGS. 4 and 5, the heat radiation opening 29 is formed in a circular shape by providing two on the front side and two on the rear side. The number, size (size), shape, and arrangement of the heat radiation openings 29 are not limited.

  Thus, the heat-insulating plates 25, 26, 27, and 28 provide a heat-insulating effect from the ambient temperature by the heat-dissipating openings 29 formed in the heat-insulating plate 28 provided on the upper surface side of the casing 17 of the navigation / audio unit 1. While maintaining, the heat radiation opening 29 can radiate the self-heating of the navigation / audio unit 1.

Next, an embodiment is shown in FIGS.
FIG. 6: shows the general | schematic perspective view of the whole structure of the heat countermeasure structure of the vehicle-mounted electronic device which concerns on one Embodiment. 7 is a schematic cross-sectional view taken along the line CC in FIG. Other configurations are the same as those of the embodiment of FIGS.

  In the embodiment of FIGS. 6 and 7, as a heat radiating means, the upper surface 17 e side of the casing 17 of the navigation / audio unit 1 is also covered with a heat insulating plate 28, and a heat radiating opening 29 is provided in the heat insulating plate 28 on the upper surface 17 e side. However, in this embodiment, the upper surface 17e side of the casing 17 of the navigation / audio unit 1 is also covered with the heat insulating plate 30, and the heat insulating plate 30 is provided with two heat radiation openings 33 on the rear surface side. The heat radiation opening 33 may not be formed.

  A heat radiating member 35 is interposed between the heat insulating plates 26, 27, 30 and all the surfaces of the upper surface 17 e, the lower surface 17 c, and the side surfaces 17 d on both sides, and the heat radiating member 35 is disposed on the front surface of the casing 17. 26, 27, and 30 have a heat radiating portion 37 projecting outward.

  The heat radiating member 35 is made of a metal having high thermal conductivity such as copper or aluminum. The heat radiating portion 37 of the heat radiating member 35 is disposed at the front end portion of the heat insulating plates 26, 27, and 30 and is provided in an annular shape over the entire circumference of the casing 17.

  Further, as shown in FIGS. 6 and 7, a decorative design panel 39 is attached to the front surface of the heat radiating portion 37 in order to improve the appearance from the passenger compartment. The design panel 39 is formed in a quadrangular annular shape so as to hide the heat radiating portion 37 so as to cover the heat radiating portion 37 and prevent the heat radiating portion 37 from being visually recognized from the vehicle interior side. Further, the design panel 39 is bonded to the heat radiating portion 37 with an adhesive, for example.

  In addition, the design panel 39 is colored for decoration in the passenger compartment and is attached in contact with the heat radiating portion 37, so that the design panel 39 is preferably formed of a heat-resistant material.

  According to the present embodiment, the heat radiating member 35 is interposed between the heat insulating plates 26, 27, 30 and the casing 17 of the navigation / audio unit 1, and the heat radiating member 35 protrudes outside the heat insulating plates 26, 27, 30. Since the heat radiating portion 37 is provided, the heat radiating member 35 and the heat radiating portion 37 can surely release the self-heating of the navigation / audio unit 1 to the outside of the heat insulating plates 26, 27, 30, and the heat insulating plates 25, 26, 27 and 30 can reliably insulate the ambient air temperature rise from the rear air conditioner duct 21 and the lower air conditioner duct 23.

In addition, since the heat radiation opening 33 is formed on the heat insulating plate 30 on the upper surface 17e side as shown in FIGS. It can be done reliably.
Further, the heat radiating member 35 may be installed on the rear surface 17b side of the casing 17.

  Moreover, according to this embodiment, since the thermal radiation part 37 of the thermal radiation member 35 is covered with the design panel 39, the appearance of the thermal radiation part 37 from the vehicle interior side can be prevented from deteriorating. Furthermore, it is possible to prevent a high temperature on the front surface 17a side of the navigation / audio unit 1 due to heat radiation from the heat radiation portion 37.

  According to at least one embodiment of the present invention, since the heat countermeasure of the in-vehicle electronic device can be obtained for both the increase in the ambient temperature of the air conditioner duct and the temperature increase due to self-heating during the operation of the in-vehicle electronic device, Suitable for use in electronic equipment.

1 Navi / Audio unit (on-vehicle electronic equipment)
3 Instrument panel 11 Display 17 Casing 17a Casing front surface 17b Casing rear surface 17c Casing lower surface 17d Casing side surface 17e Casing upper surface 19 Air outlet 21 Rear air conditioning duct (air conditioning duct)
23 Lower air conditioner duct (air conditioner duct)
25, 26, 27, 28, 30 Heat insulating plate 35 Heat radiating member (heat radiating means)
37 Heat radiation part 29, 33 Heat radiation opening (heat radiation means)
39 Design panel K Opening part (heat dissipation means)
S air layer

Claims (5)

A heat countermeasure structure for an in-vehicle electronic device mounted on an instrument panel arranged in front of the vehicle interior,
An air conditioner duct disposed around the vehicle-mounted electronic device and guiding the conditioned air to an air outlet provided toward the vehicle interior;
A heat insulating plate provided at least between the air conditioning duct and the in-vehicle electronic device, and disposed around a casing of the in-vehicle electronic device;
Heat radiating means for radiating self-heating from the in-vehicle electronic device to the upper surface side of the casing of the in-vehicle electronic device;
A heat countermeasure structure for in-vehicle electronic devices characterized by comprising:   2. The heat countermeasure structure for an in-vehicle electronic device according to claim 1, wherein the heat radiating means is configured by an open state without the heat insulating plate being provided on an upper surface side of the casing of the in-vehicle electronic device.   2. The heat countermeasure for an in-vehicle electronic device according to claim 1, wherein the heat radiating means includes a heat radiating opening formed in the heat insulating plate provided on an upper surface side of a casing of the in-vehicle electronic device. Construction.   The heat dissipation member is interposed between the heat insulating plate and the in-vehicle electronic device, and the heat dissipating member has a heat dissipating part protruding outside the heat insulating plate on the front side of the casing. 3. A heat countermeasure structure for an in-vehicle electronic device according to 3.   The heat countermeasure structure for an in-vehicle electronic device according to claim 4, wherein a decorative design panel is installed on a front side of the heat radiating portion.

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