Screw boss structure and in-vehicle device

Abstract

To secure a space in a depth direction and improve molding precision.SOLUTION: A screw boss structure includes: a pedestal 1 having plate-like leg parts 1A protruding from a rear surface 20C of a cluster panel 20, and a support part 1B provided at protruding ends of the leg parts 1A; and a screw boss 2 having a boss part 2A extending from the support part 1B along a protruding direction of the leg part 1A, and a lower hole 2B formed at the boss part 2A. In the screw boss 2, the boss part 2A is formed extending from the support part 1B in a direction toward the rear surface 20C and is provided connected to the leg parts 1A. The lower hole 2B is formed exceeding a thickness of the support part 1B.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a screw boss structure and an in-vehicle device.

Background Art

[0002] Conventionally, for example, Patent Document 1 discloses that a base is formed on a standing wall around a front panel, and a boss is formed on this base. Patent Document 2 discloses that a boss is provided on the back surface of a cabinet via a hollow pedestal. Patent Document 3 discloses that only the end portions at the roots of a plurality of ribs provided on the side wall of a screw boss are joined to a mother wall so that the bottom surface of the screw boss is separated from the mother wall for molding.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] When forming a screw boss on the back side of an appearance part made of a synthetic resin material, it is known not to cause sink marks on the surface (such as in Patent Document 1), and it is known to form a screw boss via a pedestal (such as in Patent Documents 2 and 3). However, in such a screw boss structure, since the depth dimension for tightening the screw is determined by the sum of the height of the screw boss and the height of the pedestal in consideration of the underhead length of the screw, there may be a case where a deeper space for tightening the screw cannot be secured further.

[0005] An object of the present invention is to provide a screw boss structure and an in-vehicle device that can secure a depth space for tightening a screw without causing sink marks on the surface.

Means for Solving the Problems

[0006] To achieve the above object, a screw boss structure according to an aspect of the present invention includes a pedestal having a plate-shaped leg portion protruding from the back surface of a panel member and a support portion provided at a protruding end of the leg portion, a boss portion extending along the protruding direction of the leg portion from the support portion, and a screw boss having a pilot hole formed in the boss portion, wherein the screw boss is formed such that the boss portion further extends in a direction toward the back surface from the support portion and is provided to be connected to the leg portion, and the pilot hole is formed to exceed the thickness of the support portion.

[0007] To achieve the above object, an in-vehicle device according to an aspect of the present invention includes the above screw boss structure.

Effects of the Invention

[0008] According to the present invention, a depth space can be secured and the molding accuracy can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments for carrying out the invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. Note that the present invention is not limited by the following embodiments. Also, the components in the following embodiments include those that can be easily assumed by those skilled in the art, substantially identical components, and those within the so-called equivalent range. Furthermore, the components disclosed in the following embodiments can be combined as appropriate.

[0011] An in-vehicle device 100 to which the boss screw structure of the embodiment is applied is mounted inside a vehicle. The in-vehicle device 100 is, for example, an AV (Audio Visual) integrated car navigation device. As shown in FIGS. 1 and 2, the in-vehicle device 100 includes an in-vehicle device 10 and a cluster panel (panel member) 20.

[0012] The in-vehicle device 10 has a display unit 12 and a sub-panel 13 on the front side of the device main body 11. The front side is the side facing the front inside the vehicle in the case of a car navigation device mounted inside the vehicle, so it is the surface facing the rear inside the vehicle. Conversely, the surface facing the front inside the vehicle is defined as the rear surface.

[0013] The device main body 11 is a housing with an open front and the other upper, lower, right, left, and rear surfaces closed by sheet metal. The device main body 11 houses drive components for moving electronic components and the display unit 12 inside the housing. Although not shown in the figure, brackets are fixed to the right and left sides of the device main body 11, and the device is fixed to the vehicle by screwing the brackets to the fixing parts on the vehicle side.

[0014] In the embodiment, the display unit 12 is formed in a rectangular shape with dimensions larger than those of the device main body 11 in the vertical and horizontal directions, and is disposed on the front side of the device main body 11. The display unit 12 is usually arranged with the display surface 12A facing the front so as to cover the front of the device main body 11. The display unit 12 is composed of, for example, a liquid crystal display (LCD) or an organic electro-luminescence (EL) display. Further, for the display unit 12, for example, a pressure-sensitive touch panel can be applied to the display surface 12A. The display unit 12 is provided movably with respect to the device main body 11. For example, the display unit 12 is provided so as to be tiltable such that the display surface 12A faces upward. Also, the display unit 12 is provided so as to be reversely tiltable such that the display surface 12A faces downward. Further, the display unit 12 is provided so as to be openable to expose a card slot for inserting a storage medium such as a memory card by opening the front of the device main body 11, or a disc slot for inserting a DVD (Digital Versatile Disc) or a CD (Compact Disc) on the front.

[0015] In the embodiment, the sub-panel 13 is formed in a rectangular frame shape with dimensions larger than those of the device main body 11 in the vertical and horizontal directions, and is disposed on the front side of the device main body 11 together with the display unit 12. The sub-panel 13 is molded from a synthetic resin material such as an ABS (acrylonitrile-butadiene-styrene) resin. The sub-panel 13 is fixed to the device main body 11. When the display unit 12 is arranged with the display surface 12A facing the front so as to cover the front of the device main body 11, the sub-panel 13 is disposed on the back side of the display unit 12 and abuts against the back side of the display unit 12 to position the display unit 12.

[0016] The cluster panel 20 is formed of a synthetic resin material such as an ABS (acrylonitrile-butadiene-styrene) resin. As shown in FIGS. 1 and 2, the cluster panel 20 is formed so as to surround the display unit 12. The cluster panel 20 has a rectangular frame portion 20A that surrounds the periphery of the display unit 12, and a rectangular window portion 20Aa that opens the display surface 12A of the display unit 12 inside the frame portion 20A. Further, the cluster panel 20 is provided with a push button 20B on the frame portion 20A. The push button 20B operates a switch element provided on the back side by a pressing operation from the front side. The cluster panel 20 is detachably provided with respect to the sub-panel 13 of the in-vehicle device 10.

[0017] The screw boss structure of the embodiment is provided, for example, to fix a predetermined member 51 by screwing a screw 50 on the back surface (rear surface) 20C side of the cluster panel (panel member) 20 in the in-vehicle device 100 described above (see FIGS. 4, 6, and 8).

[0018] As shown in FIGS. 2 to 8, the screw boss structure of the embodiment includes a pedestal 1 and a screw boss 2. These pedestal 1 and screw boss 2 are integrally molded with the cluster panel 20 made of a synthetic resin material.

[0019] The pedestal 1 is provided on the back surface 20C of the cluster panel 20. The pedestal 1 has a leg portion 1A and a support portion 1B. The leg portion 1A is formed in a plate shape (rib shape) that protrudes from the back surface 20C of the cluster panel 20 toward the back side. The leg portion 1A of the embodiment is formed in a U shape in a front-rear view as shown in FIGS. 2, 3, 5, and 7. The support portion 1B is formed in a plate shape provided along the back surface 20C of the cluster panel 20 from the protruding end of the leg portion 1A. The support portion 1B of the embodiment is provided so as to close the protruding end on the back side of the U-shaped leg portion 1A.

[0020] The pedestal 1 is formed with a height Ta on the back side from the back surface 20C of the cluster panel 20. The height Tb of the leg portion 1A is the dimension excluding the thickness Wa of the support portion 1B. The pedestal 1 of the embodiment is configured such that one location along the back surface 20C of the U-shaped leg portion 1A is open. Since this pedestal 1 is formed in a plate shape where the leg portion 1A protrudes from the back surface 20C of the cluster panel 20, it reduces the wall thickness of the synthetic resin material and prevents sink marks from occurring on the surface (front) side of the cluster panel 20. Note that the leg portion 1A of the pedestal 1 only needs to be formed in a plate shape to prevent the occurrence of sink marks, and is not limited to the U shape. Note that the height Tb of the leg portion 1A needs to be the minimum height that ensures the mold strength of the slider 200 that forms the space formed by the leg portion 1A and the support portion 1B.

[0021] The screw boss 2 is provided on the pedestal 1. The screw boss 2 has a boss portion 2A and a counterbore 2B. The boss portion 2A is formed in a column shape extending in the front-back direction, and the tip portion 2Aa is provided protruding from the support portion 1B to the back side. In the embodiment, as shown in FIGS. 2, 3, 5, and 7, the tip portion 2Aa of the boss portion 2A is formed in a cylindrical shape. The boss portion 2A is not limited to the cylindrical shape. The base end portion 2Ab of the boss portion 2A extends and is formed on the back surface 20C side (front side) of the support portion 1B. The base end portion 2Ab is molded based on the same outer shape as the tip portion 2Aa. The boss portion 2A is provided such that the base end portion 2Ab is connected to the leg portion 1A. That is, the boss portion 2A is molded such that the base end portion 2Ab is integrated with the leg portion 1A. As shown in FIGS. 3 and 7, it is desirable that the portion having the maximum diameter d of the base end portion 2Ab (tip portion 2Aa) of the boss portion 2A is integrally connected to the leg portion 1A. Also, as shown in FIG. 5, the portion having the maximum diameter d of the base end portion 2Ab (tip portion 2Aa) of the boss portion 2A may be separated from the leg portion 1A, and the portion having a diameter less than the maximum diameter d may be integrally connected to the leg portion 1A. Also, although not shown in the figure, the boss portion 2A may include the portion having the maximum diameter d of the base end portion 2Ab (tip portion 2Aa), and the portion having a diameter less than the maximum diameter d may be integrally connected to the leg portion 1A.

[0022] Note that although the screw boss structure of the embodiment is not explicitly shown in the figure, the screw boss 2 is provided at the bent corner of the leg portion 1A of the pedestal 1, and the base end portion 2Ab of the boss portion 2A is connected to the bent leg portion 1A. The screw boss structure in this case, similar to the above, includes a configuration in which the boss portion 2A includes a portion having the maximum diameter d of the base end portion 2Ab (tip end portion 2Aa) and is provided connected to the leg portion 1A. Alternatively, the boss portion 2A may be provided such that the portion having the maximum diameter d of the base end portion 2Ab (tip end portion 2Aa) is separated from the leg portion 1A and the portion having a diameter less than the maximum diameter d is connected to the leg portion 1A.

[0023] As shown in FIGS. 4, 6, and 8, the boss portion 2A has a length obtained by adding the length La in the front-back direction of the tip end portion 2Aa, the length Lb in the front-back direction of the base end portion 2Ab, and the thickness Wa of the support portion 1B. The length Lb of the base end portion 2Ab of the boss portion 2A is equal to or less than the height Tb of the leg portion 1A. Therefore, the base end 2Aba of the base end portion 2Ab of the boss portion 2A is formed away from the back surface 20C of the cluster panel 20. By forming the base end 2Aba of the boss portion 2A away from the back surface 20C of the cluster panel 20, even if the base end portion 2Ab is provided connected to the leg portion 1A, the plate-like shape of the leg portion 1A can be ensured, and a configuration for preventing the occurrence of sink marks described above can be achieved.

[0024] The counterbore 2B is formed to extend in the front-back direction from the tip 2Aaa of the tip end portion 2Aa of the boss portion 2A toward the back surface 20C side (front side). The counterbore 2B is for fixing the member 51 to the boss portion 2A with a tapping screw 50. In FIGS. 4 and 6, the counterbore 2B is formed to be closed at the base end portion 2Ab in the middle of the boss portion 2A. The length (depth) Lc of the counterbore 2B is longer than the length obtained by adding the length La of the tip end portion 2Aa of the boss portion 2A and the thickness Wa of the support portion 1B. That is, the counterbore 2B reaches the base end portion 2Ab of the boss portion 2A toward the back surface 20C side (front side) and is formed to exceed the thickness Wa of the support portion 1B. In this case, for the screw 50, the length Lc of the screw portion 50B, which is under the head 50A, can be the length obtained by adding the thickness Wb of the member 51 and subtracting a predetermined extra length Le at the closing portion of the counterbore 2B from the length Lc of the counterbore 2B.

[0025] Note that in FIG. 8, the counterbore 2B may be formed to penetrate the proximal end 2Aba of the proximal end portion 2Ab of the boss portion 2A. The length (depth) Lc of the counterbore 2B is the same as the length of the boss portion 2A, and is the length obtained by adding the length La in the front-rear direction of the distal end portion 2Aa of the boss portion 2A, the length Lb in the front-rear direction of the proximal end portion 2Ab of the boss portion 2A, and the thickness Wa of the support portion 1B. That is, the counterbore 2B reaches the proximal end 2Aba of the boss portion 2A toward the back surface 20C side (front side) and is formed to exceed the thickness Wa of the support portion 1B. In this case, for the screw 50, the length Lc of the screw portion 50B, which is below the head 50A of the screw 50, can be the length obtained by adding the thickness Wb of the member 51 and the length Lc of the counterbore 2B and excluding a predetermined extra length Le from the back surface 20C of the cluster panel 20 toward the back side.

[0026] As described above, the screw boss structure of the embodiment includes a pedestal 1 having a plate-like leg portion 1A protruding from the back surface 20C of the cluster panel (panel member) 20 and a support portion 1B provided at the protruding end of the leg portion 1A, and a screw boss 2 having a boss portion 2A extending along the protruding direction of the leg portion 1A from the support portion 1B and a counterbore 2B formed in the boss portion 2A. The screw boss 2 is formed such that the boss portion 2A extends further in the direction toward the back surface 20C from the support portion 1B and is provided to be connected to the leg portion 1A, and the counterbore 2B is formed to exceed the thickness of the support portion 1B.

[0027] According to this screw boss structure, by providing the plate-like leg portion 1A to protrude from the back surface 20C and providing the boss portion 2A on the support portion 1B provided at the protruding end of the leg portion 1A, it is possible to prevent the occurrence of sink marks on the surface of the cluster panel 20.

[0028] Also, according to this screw boss structure, the base end portion 2Ab of the boss portion 2A extends further in the direction toward the back surface 20C from the support portion 1B, and the counterbore 2B is formed to exceed the thickness of the support portion 1B, so that a screw 50 with a long underhead length Ld can be applied. In a general screw boss structure, in order to apply a screw 50 with a long underhead length Ld, it is necessary to extend the length La of the tip end portion 2Aa of the boss portion 2A from the support portion 1B. However, in the screw boss structure of the embodiment, such a necessity does not exist. This screw boss structure can secure a depth space for tightening the screw 50.

[0029] Also, according to this screw boss structure, the boss portion 2A is formed to extend from the support portion 1B toward the back surface 20C and is provided so as to be connected to the leg portion 1A, thereby preventing an undercut portion 3 (FIGS. 9 and 10) from occurring between the boss portion 2A and the leg portion 1A on the back surface 20C side of the support portion 1B.

[0030] Here, in the screw boss structure of the reference example shown in FIGS. 9 and 10, in the screw boss 21, since the base end portion 2Ab of the boss portion 2A is formed to be separated from the leg portion 1A, the undercut portion 3 occurs. The undercut portion 3 is a region where die extraction cannot be performed when removing the slider 200 that forms the space formed by the leg portion 1A and the support portion 1B, and is a portion where the volume of the synthetic resin material increases. As a result, in the screw boss structure of the reference example, in the screw boss 21, in the region P surrounded by the dashed-dotted line in FIG. 10, a sink mark occurs in the portion near the undercut portion 3 of the base end portion 2Aa of the boss portion 2A. In the screw boss structure of the reference example, if a sink mark occurs in this portion, the counterbore 2B may have a molding defect, and the tightening strength of the screw 50 may decrease.

[0031] In this regard, in the screw boss structure of the embodiment shown in FIGS. 3 to 8, since the boss portion 2A is provided so as to be connected to the leg portion 1A, the undercut portion 3 is less likely to occur significantly (see FIGS. 5 and 6), or the undercut portion 3 does not occur (see FIGS. 3, 4, 7, and 8). As a result, this screw boss structure can improve the molding accuracy of the screw boss 2.

[0032] Further, in the screw boss structure of the embodiment, the screw boss 2 includes a portion having the maximum diameter d of the boss portion 2A and is provided so as to be connected to the leg portion 1A.

[0033] According to this screw boss structure, as shown in FIGS. 3, 4, 7, and 8, since the screw boss 2 includes a portion having the maximum diameter d of the boss portion 2A and is provided so as to be connected to the leg portion 1A, an undercut portion 3 does not occur. As a result, this screw boss structure can further improve the molding accuracy of the screw boss 2.

[0034] Further, in the screw boss structure of the embodiment, the screw boss 2 is formed by closing the counterbore 2B in the middle of the boss portion 2A.

[0035] According to this screw boss structure, the inner wall of the counterbore 2B will be scraped when the screw 50 is tightened, but this scrap can be retained inside the boss portion 2A. As a result, this screw boss structure prevents the situation where the chips of the screw 50 spread around.

[0036] Further, in the screw boss structure of the embodiment, the screw boss 2 is formed by the counterbore 2B penetrating the boss portion 2A.

[0037] According to this screw boss structure, the counterbore 2B can be penetrated when the screw 50 is tightened. As a result, this screw boss structure can increase the scraping area of the screw 50, so that the tightening strength of the screw 50 can be improved.

[0038] The in-vehicle device 100 of the embodiment has the above-described screw boss structure.

[0039] According to this in-vehicle device 100, a depth space for tightening the screw 50 can be secured, and the molding accuracy of the portion for tightening the screw 50 can be improved.

Explanation of Reference Numerals

[0040] 1 pedestal 1A leg portion 1B support portion 2 screw boss 2A boss portion Lower acupuncture point 2B 100 Vehicle-mounted device

Claims

1. A pedestal having a plate-shaped leg portion protruding from the back surface of the panel member and a support portion provided at the protruding end of the leg portion, A screw boss having a boss portion extending along the protruding direction of the leg portion from the support portion and a counterbore formed in the boss portion, Comprising, The screw boss is formed such that the boss portion extends further in a direction from the support portion toward the back surface and is provided connected to the leg portion, and the counterbore is formed longer than the length of the tip portion of the boss portion plus the thickness of the support portion, a screw boss structure.

2. The screw boss is provided connected to the leg portion including a portion having the maximum diameter of the boss portion, the screw boss structure according to claim 1.

3. The screw boss is the screw boss structure according to claim 1 or 2, wherein the counterbore is formed by closing in the middle of the boss portion.

4. The screw boss is the screw boss structure according to claim 1 or 2, wherein the counterbore is formed through the boss portion.

5. An in-vehicle device comprising the screw boss structure according to any one of claims 1 to 4.

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