JP2006001413A - Outside air introduction structure for electronic unit storage box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outside air introduction structure for an electronic unit storage box capable of improving assembly workability in an engine room, and efficiently cooling an electronic unit stored in the electronic unit storage box. <P>SOLUTION: In the outside air introduction structure for an electronic unit storage box 3, the electronic unit 5 is stored in the interior, and an outside air introduction port part 7 introducing the outside air into the storage box 3 is provided in a protruding manner on an outside wall of the electronic unit storage box 3 mounted in the engine room 1, so as to cool the electronic unit 5 by introducing the outside air from the introduction port part 7 into the storage box 3. The outside air introduction structure is constituted so that a grommet 15 is provided in a through-hole 13 formed on a partition wall 11 partitioning the engine room 1 and a cabin 9, the outside air introduction port part 7 is inserted in the grommet 15, and the electronic unit 5 is cooled by introducing the outside air in the cabin 9 from the outside introduction port part 7 into the storage box 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an outside air introduction structure for an electronic unit storage box mounted on a vehicle.

  In the engine room of the vehicle, an electronic unit storage box called an electro box (E box) in which an electronic unit (ECU) for controlling the engine or the like is stored is mounted. The electronic unit is configured by printing a conductor circuit pattern on a circuit board and mounting an electric or electronic component to form an electronic control circuit. When the electronic unit rises above the allowable temperature due to heat generated by the electronic control circuit, the operation becomes unstable. In order to prevent the temperature from rising, air outside the engine room (hereinafter referred to as outside air) is introduced into the storage box. The electronic unit is then cooled.

  The outside air introduction structure for introducing outside air into the electronic unit storage box has an outside air introduction port portion for introducing outside air into the outer wall of the electronic unit storage box, which projects to the base end of the flexible duct. Are connected to the outside air introduction hole formed in the bottom wall of the engine room, or penetrate the outside air introduction hole to the outside. It is comprised so that it may protrude, and external air is introduce | transduced in an electronic unit storage box from an external air introduction port part via a flexible duct, and an electronic unit is cooled (refer patent document 1, 2).

JP 2002-198671 A JP 2003-163478 A

  However, according to the outside air introduction structure of the conventional electronic unit storage box, it is not easy to route the flexible duct in the narrow engine room, and there is a problem that the workability of assembling the outside air introduction structure is deteriorated. In addition, due to the fluid frictional resistance of the flexible duct, there is a problem that the amount of outside air introduced into the box is reduced and the electronic unit cannot be cooled efficiently. Furthermore, the temperature of the outside air rises to over 30 degrees in the summer (hot season), especially in the daytime, and the outside air often becomes hot air, which may make it difficult to cool the electronic unit below the desired temperature. .

  The object of the present invention is to solve the above-mentioned problems, to improve the assembly workability in the engine room, to efficiently cool the electronic unit stored in the electronic unit storage box, and further to the electronic unit even in summer. It is an object of the present invention to provide an outside air introduction structure for an electronic unit storage box storage box that can be easily cooled.

  In order to achieve the above object, according to a first aspect of the present invention, an electronic unit is housed inside, and outside air is placed on the outer wall of the electronic unit housing box mounted in the engine room. In the outside air introduction structure of the electronic unit storage box, the outside air introduction port portion to be introduced into the storage unit box is protruded, and the outside air is introduced into the storage box from the outside air introduction port portion to cool the electronic unit. A grommet that seals between the outside air inlet port and the partition wall is provided in a through hole formed in the partition wall that partitions the compartment, and the outside air inlet port portion is inserted into the grommet so that the outside air in the vehicle compartment can be stored from the outside air inlet port. The electronic unit is cooled by being introduced into the box.

  According to a second aspect of the present invention, an electronic unit is housed inside, and an outside air introduction port portion for introducing outside air into the housing box projects into an outer wall of the electronic unit housing box mounted in the engine room. In the outside air introduction structure of the electronic unit storage box, the outside air is introduced into the storage box from the outside air inlet port to cool the electronic unit, and is formed in a partition wall that partitions the engine room and the vehicle compartment. A standby sleeve is inserted into the through hole, and a grommet that seals between the outside air introduction port and the partition wall is provided on the outer periphery of the outside air introduction port, and the outside air introduction port is inserted into the standby sleeve to remove outside air in the vehicle interior. The electronic unit is cooled by being introduced into the storage box from the outside air inlet port.

  According to a third aspect of the present invention, in the outside air introduction structure of the electronic unit storage box according to the second aspect, the standby sleeve is restrained from moving in the longitudinal direction of the sleeve by the through hole of the partition wall. A locking projection is formed in the outside air introduction port portion of the storage box to be engaged with the standby sleeve, and the outside air introduction port portion is formed by the locking projection and a grommet, so that the standby sleeve has a longitudinal direction of the introduction port portion. It is inserted so that a movement is restrained, It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, in the outside air introducing structure for the electronic unit storage box according to the second or third aspect, a silencer is interposed between the partition wall, the standby sleeve and the grommet. It is what.

  According to the outside air introduction structure described in claim 1 of the present invention, since the outside air introduction port portion of the electronic unit storage box is directly inserted into the grommet provided in the through hole of the partition wall, it is flexible in a narrow engine room. This eliminates the need to route the duct and improves the workability of assembling the outside air introduction structure. In addition, since the flexible duct is not necessary and the distance between the passenger compartment and the electronic unit storage box is shortened, the fluid friction resistance of the outside air is reduced, and the outside air is smoothly introduced into the storage box. Can be efficiently cooled. Furthermore, since the vehicle interior is often air-conditioned and cooled to a constant temperature in summer, it is possible to introduce the cooled outside air in the vehicle interior into the storage box. Therefore, the electronic unit can be easily cooled even in summer.

  According to the outside air introduction structure described in claim 2 of the present invention, the outside air introduction port portion of the electronic unit storage box is directly inserted into the standby sleeve inserted into the through hole formed in the partition wall. As in the case of 1, the assembly workability of the outside air introduction structure can be improved, the electronic unit 5 can be efficiently cooled, and the electronic unit 5 can be easily cooled even in summer. Further, the grommet is provided not on the through hole of the partition wall but on the outer periphery of the outside air introduction port portion of the storage box. Therefore, when assembling the outside air introduction structure, it is not necessary to insert the outside air introduction port portion into the grommet with an excessive insertion force, and the outside air introduction port portion is inserted into the standby sleeve with a light insertion force. As a result, it is possible to further improve the assembly workability of the outside air introduction structure. Furthermore, even after the outside air introduction structure is assembled, even if the position of the storage box is shifted due to vibration or the like, the sealing performance between the outside air introduction port portion and the partition wall is hardly lowered, so that the water stopping property can be improved with certainty.

  According to the outside air introduction structure described in claim 3 of the present invention, since the locking projection to be locked to the standby sleeve is formed at the outside air introduction port portion of the storage box, the locking projection is formed on the standby sleeve. When locked, the operator can easily recognize the stroke completion point until the outside air inlet port is inserted into the standby sleeve by a locking sound or the like. Therefore, the insertion failure such as the semi-insertion state of the outside air introduction port portion is reduced, the assembling workability of the outside air introduction structure is improved, and the outside air in the vehicle interior can be reliably introduced into the storage box. The temperature rise of the electronic unit can be accurately prevented.

  According to the outside air introduction structure described in claim 4 of the present invention, since the silencer is interposed between the partition wall, the standby sleeve and the grommet, noise and vibration generated from the engine room are absorbed by the silencer, and the grommet, Transmission to the vehicle interior through the outside air inlet and the standby sleeve is suppressed, and sound insulation can be improved. In addition, the water stoppage of the grommet can be further increased by the buffering action of the silencer.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of an outside air introduction structure for an electronic unit storage box according to the present invention. (A) is an exploded sectional view of the state before assembling the outside air introduction structure, and (b) is an assembled state. It is sectional drawing.

  In an engine room 1 of an automobile or other vehicle, as shown in FIGS. 1A and 1B, an electronic unit called an electro box (E box) in which an electronic unit (ECU) 5 for controlling the engine and the like is housed. The storage box 3 is mounted, and in order to prevent the temperature of the electronic unit 5 from rising, outside air is introduced into the storage box 3 to cool the electronic unit 5.

  The outside air introduction structure for introducing outside air into the storage box 3 in the present embodiment introduces outside air into the storage box 3 on the outer wall of the electronic unit storage box 3, for example, a cylindrical outside air introduction port 7 projects. A grommet 15 is provided in a partition wall 11 that partitions the engine room 1 and the vehicle compartment 9, for example, a circular through hole 13 formed in the dash panel, for sealing the space between the outside air inlet 7 and the partition wall 11. It is provided and the outside air inlet 7 is configured by being inserted into the grommet 15. Then, the outside air in the passenger compartment 9 is introduced into the storage box 3 from the outside air introduction port portion 7 to cool the electronic unit 5, and the storage box 3 is provided at a location different from the outside air introduction port portion 7. The air is exhausted out of the box 3 from an outside air outlet (not shown).

  The grommet 15 is made of, for example, an annular rubber or plastic annular body that can be elastically deformed, and a circular outside air introduction hole 15a into which the outside air introduction port portion 7 is inserted is formed on the inner side. An annular groove 15b into which the through hole 13 of the partition wall 11 is fitted is formed concentrically at substantially the center.

  According to the outside air introduction structure of the first embodiment, the outside air introduction port portion 7 of the electronic unit storage box 3 is directly inserted into the grommet 15 provided in the through hole 13 of the partition wall 11. There is no need to route the flexible duct, and the assembly workability of the outside air introduction structure can be improved. In addition, since a flexible duct is not necessary and the distance between the vehicle compartment 9 and the electronic unit storage box 3 is shortened, the fluid friction resistance (pressure loss) of the outside air is reduced, and the outside air enters the storage box 3. It is smoothly introduced and the electronic unit 5 can be efficiently cooled. Further, since the interior of the passenger compartment 9 is often air-conditioned and cooled to a constant temperature in summer, it becomes possible to introduce the outside air cooled in the passenger compartment 9 into the storage box 3. Therefore, the electronic unit 5 can be easily cooled even in summer. If an electric fan (not shown) is provided in the electronic unit storage box 3 to actively introduce, circulate, or exhaust outside air into the storage box 3, the space between the outside air and the electronic unit 5 can be reduced. Heat exchange is further promoted, and the electronic unit 5 can be cooled more efficiently.

  FIG. 2 is an exploded sectional view showing a state before the outside air introduction structure is assembled in the second embodiment of the present invention, and FIG. 3 is an enlarged sectional view showing a state where the outside air introduction structure is assembled. As shown in FIGS. 2 and 3, the outside air introduction structure of the present embodiment has a standby sleeve 17 inserted in the through hole 13 of the partition wall 11, and an outside air introduction port on the outer periphery of the outside air introduction port portion 7 of the storage box 3. A grommet 19 that seals between the portion 7 and the partition wall 11 in a liquid-tight manner is provided, and the outside air introduction port portion 7 is configured to be inserted into the standby sleeve 17, so that the outside air in the passenger compartment 9 is drawn from the outside air introduction port portion 7. The electronic unit 5 is cooled by being introduced into the storage box 3.

  The standby sleeve 17 is a cylindrical inner holder 21, a cylindrical outer holder 23 having a U-shaped longitudinal section, and an inner holder 21 and an outer holder 23 that are coaxially connected to each other on the front side of the holders 21 and 23. For example, it is formed by molding a hard plastic. A circular outside air introduction hole 21 a into which the outside air introduction port 7 is inserted is formed inside the inner holder 21. Further, an annular locking projection (locking claw) 21 b that is locked to the side surface of the partition wall 11 on the engine room 1 side is formed at the front portion of the inner holder 21. Note that a plurality of the locking protrusions 21b may be formed intermittently at intervals in the circumferential direction. Further, a through hole 13 of the partition wall 11 is fitted between the locking protrusion 21b on the outer peripheral surface of the inner holder 21 and the front portion of the outer holder 23, and a concave groove 21c in which the partition wall 11 is interposed is formed. It is formed in an annular shape continuously in the circumferential direction. Thus, the standby sleeve 17 is inserted into the through hole 13 of the partition wall 11 so that the movement of the sleeve 17 in the longitudinal direction is restricted.

  The grommet 19 can be elastically deformed similarly to the grommet 15, and is made of, for example, an annular rubber or plastic annular body, and on the inside, a through hole 19 a that fits with the outer peripheral surface on the base side of the outside air inlet portion 7, An annular slit 19b extending radially outward is formed on the inner peripheral surface of the through hole 19a. In addition, an annular tongue piece 19 c that is pressed against the side surface of the partition wall 11 on the side of the engine room 1 and liquid-tightly seals between the outside air inlet 7 and the partition wall 11 is formed on the side surface facing the partition wall 11. The grommet 19 is provided by insertion or the like in the outside air introduction port portion 7 by inserting and engaging an annular rib 7a protruding from the outer peripheral surface of the base side of the outside air introduction port portion 7 into the slit 19b. The space between the grommet 19 and the outside air inlet 7 is sealed in a liquid-tight manner.

  At the front end (free end) of the outside air introduction port portion 7 of the storage box 3, an annular locking projection 7 b that is engaged with the rear portion of the inner holder 21 of the standby sleeve 17 is formed, and the outside air introduction port portion 7 is engaged. The stop projection 7b and the grommet 19 are inserted into the inner holder 21 of the standby sleeve 17 so that the movement of the introduction port portion 7 in the longitudinal direction is restricted. Note that a plurality of the locking protrusions 7b may be formed intermittently at intervals in the circumferential direction. Further, the locking projection 7 b may be formed not on the tip of the outside air introduction port 7 but on the outer peripheral surface in the middle of the outside air introduction port 7. In this case, a locking groove (not shown) that engages with the locking projection 7b is formed on the inner surface of the inner holder 21 of the waiting sleeve 17 corresponding to the locking projection 7b. Since other structures are the same as the outside air introduction structure of the first embodiment, description thereof is omitted.

  When assembling the outside air introduction structure of the second embodiment, a grommet 19 is provided in the outside air introduction port portion 7 of the electronic unit storage box 3, and a standby sleeve 17 is inserted into the through hole 13 of the partition wall 11. The assembly is completed by pressing the part 7 against the standby sleeve 17 and inserting it.

  According to the outside air introduction structure of the second embodiment, the outside air introduction port 7 of the electronic unit storage box 3 is directly attached to the standby sleeve 17 that is inserted into the through hole 13 formed in the partition wall 11. As in the embodiment, the assembling workability of the outside air introduction structure can be improved, the electronic unit 5 can be efficiently cooled, and the electronic unit 5 can be easily cooled even in summer. The grommet 19 is provided not on the through hole 13 of the partition wall 11 but on the outer periphery of the outside air inlet 7 of the storage box 3. Therefore, when the outside air introduction structure is assembled, there is no need to insert the outside air introduction port 7 into the conventional grommet with an excessive insertion force, and the insertion force of the outside air introduction port 7 to the standby sleeve 17 can be reduced. Thus, it is possible to further improve the assembly workability of the outside air introduction structure. Furthermore, even after the assembly of the outside air introduction structure, even if the position of the storage box 3 is shifted due to vibration or the like, the sealing performance between the outside air introduction port portion 7 and the partition wall 11 is hardly lowered, so that the water stopping property is reliably improved. Can do.

  Further, when the locking projection 7b locked to the standby sleeve 17 is formed at the outside air inlet 7 of the storage box 3 as in the present embodiment, the locking projection 7b is locked to the standby sleeve 17. When this is done, the operator can easily recognize the stroke completion time until the outside air inlet 7 is inserted into the standby sleeve 17 due to a locking sound or the like. Therefore, the insertion failure such as the semi-insertion state of the outside air introduction port portion 7 is reduced, the workability of assembling the outside air introduction structure is improved, and the outside air in the passenger compartment 9 is reliably introduced into the storage box 3. It is possible to prevent the temperature rise of the electronic unit 5 with high accuracy.

  FIG. 4 is an exploded sectional view showing a state before the outside air introduction structure is assembled in the third embodiment of the present invention, and FIG. 5 is an enlarged sectional view showing a state where the outside air introduction structure is assembled. As shown in FIGS. 4 and 5, the outside air introduction structure of the present embodiment is configured such that silencers 31 and 33 are interposed between the side portion near the through hole 13 of the partition wall 11 and the standby sleeve 27 and the grommet 29. It has become. The standby sleeve 27 includes a flange portion 23a that presses the side portion of the silencer 33 on the outer peripheral surface of the rear portion of the outer holder 23 of the standby sleeve 17, and a locking tab that is engaged with the silencer 33 on the outer periphery of the front portion of the flange portion 23a. 23b protrudes. Further, the grommet 29 is formed by protruding a tongue piece 19 d that is pressed against the outer peripheral surface of the grommet 19 against the side portion of the silencer 31 and seals between the outside air inlet 7 and the partition wall 11. Further, the silencers 31 and 33 are formed using a resin foam such as urethane foam or a sound absorbing material such as felt. Since other configurations are the same as those of the second embodiment, description thereof is omitted.

  According to the outside air introduction structure of the third embodiment, since the silencers 31 and 33 are interposed between the partition wall 11 and the standby sleeve 27 and the grommet 29, noise and vibration generated from the engine room 1 are generated in the silencers 31 and 33. Absorption and transmission to the interior of the passenger compartment 9 through the grommet 29, the outside air inlet 7 and the standby sleeve 27 are suppressed, and sound insulation can be improved. In addition, the water stopping property of the grommet 29 can be further increased by the buffering action of the silencers 31 and 33.

  In the first to third embodiments, the outside air introduction port portion 7 for introducing outside air into the electronic unit storage box 3 and the outside air discharge port portion for exhausting outside air to the outside of the storage box 3 are provided at different locations. Although it is provided, the outside air introduction port portion 7 is formed in an inside / outside double cylinder type (not shown), and outside air is introduced into the storage box 3 from the inside of the outside air introduction port portion 7, for example, into the storage box 3. The air may be exhausted out of the box 3 through an annular gap between the inner cylinder and the inner cylinder. Such a configuration of the outside air introduction port portion 7 is preferable because the outside air introduction structure of the storage box 3 is simpler and miniaturized and can be easily mounted in the engine room 1.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of an outside air introduction structure for an electronic unit storage box according to the present invention, where (a) is an exploded sectional view of the state before assembling the outside air introduction structure, and (b) is a sectional view of the assembled state. is there. In 2nd Embodiment of this invention, it is an exploded sectional view which shows the state before assembling an external air introduction structure. It is an expanded sectional view which shows the state which assembled | attached the external air introduction structure of FIG. In 2nd Embodiment of this invention, it is an exploded sectional view which shows the state before assembling an external air introduction structure. It is an expanded sectional view which shows the state which assembled | attached the external air introduction structure of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine room 3 Electronic unit storage box 5 Electronic unit 7 Outside air introduction part 7a Rib 7b Locking protrusion 9 Car compartment 11 Bulkhead 13 Through hole 15 Grommet 15a Outside air introduction hole 15b Annular groove 17 Waiting sleeve 19 Grommet 19a Through hole 19b Slit 19c Tongue piece 19d tongue piece 21 inner holder 21a outside air introduction hole 21b locking projection 21c concave groove 23 outer holder 23a collar 23b locking tab 25 connecting piece 27 standby sleeve 29 grommet 31 silencer 33 silencer

Claims (4)

  An electronic unit is stored inside, and an external air introduction port for introducing outside air into the storage box is projected from the outer wall of the electronic unit storage box mounted in the engine room. In the outside air introduction structure of the electronic unit storage box that is introduced into the inside and cools the electronic unit, the space between the outside air inlet and the partition is sealed in the through hole formed in the partition that partitions the engine room and the passenger compartment. A grommet is provided, the outside air introduction port portion is inserted into the grommet, and the outside air is introduced into the storage box from the outside air introduction port portion to cool the electronic unit. Box outside air introduction structure.   An electronic unit is stored inside, and an external air introduction port for introducing outside air into the storage box is projected from the outer wall of the electronic unit storage box mounted in the engine room. In the outside air introduction structure of the electronic unit storage box that is introduced into the electronic unit and cools the electronic unit, a standby sleeve is inserted into a through hole formed in a partition wall that partitions the engine room and the passenger compartment, and the outside air introduction A grommet that seals between the outside air inlet and the partition wall is provided on the outer periphery of the mouth, the outside air inlet is inserted into the standby sleeve, and the outside air in the vehicle compartment is introduced into the storage box from the outside air inlet. An outside air introduction structure for an electronic unit storage box, wherein the electronic unit is cooled.   The standby sleeve is inserted into the through hole of the partition so that the movement of the sleeve in the longitudinal direction is restrained, and a locking projection to be locked to the standby sleeve is formed at the outside air introduction port of the storage box. 3. The outside air introduction of the electronic unit storage box according to claim 2, wherein the introduction port portion is inserted into the standby sleeve by the locking projection and the grommet so that the movement of the introduction port portion in the longitudinal direction is restricted. Construction.   4. The outside air introduction structure for an electronic unit storage box according to claim 2, wherein a silencer is interposed between the partition wall, the standby sleeve and the grommet.

Images