JP2013107419A - Waterproof structure of display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof structure of a display device for a vehicle suppressing deterioration of an adhesion member with excellent waterproof properties.SOLUTION: This waterproof structure includes: a liquid crystal display panel 1 for displaying vehicle information; a case 2 for storing the liquid crystal display panel 1 so that display by the liquid crystal display panel 1 can be viewed; wiring 5 for connecting to the outside of the case 2; a circuit board 3 which is stored in the case 2 and is mounted with electronic parts connected to the wiring 5 to drive the liquid crystal display panel 1 thereon; a wiring pipe 6 for inserting the wiring 5 therein; and an elastically deformable grommet 4 for covering an opening 22b of the case 2 for inserting the wiring pipe 6 therein. The grommet 4 includes a cylindrical inner wall portion 42 for fixing the wiring pipe 6 with a tape T and an outer wall portion 43 for covering the tape T.

Description

  The present invention relates to a waterproof structure of a vehicle display device that displays vehicle information.

  In this type of vehicle display device, for example, various types of indicators such as a speedometer, a fuel meter, and a thermometer for instructing with a pointer are housed and fixed in the case, and each indicator is driven. The circuit board is housed and fixed. Further, in some cases, a display device comprising a liquid crystal display device is housed and fixed in the case, and a circuit board for driving the liquid crystal display device is housed and fixed in the case.

  In addition, in order to electrically route from the circuit board to the outside of the case, it is drawn from the inside of the case to the outside through an opening provided in the case via a wiring cord connected to the circuit board. ing. At this time, for example, as described in Patent Document 1, the wiring member is inserted into a grommet made of an elastic member in order to maintain waterproofness between the wiring member and the opening of the case, thereby being watertight. It is configured to keep.

  Also, when assembling the grommet through which the wiring is inserted into the case, when guiding it from the inside of the case to the outside through the opening of the case, a tape is used as an adhesive member in order to further maintain the adhesion between the wiring and the grommet. Patent Document 2 discloses a method for closing a gap by using.

Japanese Patent Laid-Open No. 10-334982 JP-A-10-214532

  However, when the structure as in Patent Document 2 is applied to a display device for a vehicle such as a two-wheeled vehicle, the tape portion may be exposed, which is caused by exhaust heat of the vehicle, sunlight, rainwater, or aging of the tape. Due to deterioration, the adhesiveness with the tape cannot be maintained, and there is a gap between the grommet and the wiring, and there is a risk of dust and moisture entering the electronic components from the gap. There was room for improvement. In addition, there is a problem that appearance quality is impaired such as partial peeling of the tape and dirt adhering to the adhesive part.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a waterproof structure for a vehicular display device that is made by paying attention to the above-described problems and is excellent in waterproofness by suppressing deterioration of an adhesive member.

  The waterproof structure of the display device for a vehicle according to the present invention includes a display unit that displays vehicle information, a case that houses the display unit so that the display by the display unit can be visually recognized, and a wiring that is connected to the outside of the case. A circuit board that is housed in the case and connected to the wiring and on which an electronic component that drives the display means is mounted; a wiring tube that inserts the wiring; and an opening of the case that inserts the wiring tube An elastically deformable waterproof member, wherein the waterproof member is provided with a cylindrical inner wall portion for fixing the wiring tube with an adhesive member, and an outer wall portion covering the adhesive member. And

  In addition, the adhesive member, the wiring tube, and the waterproof member are provided with a fixing member that binds from the outer periphery of the outer wall portion at a position where the inner wall portion and the outer wall portion of the waterproof member are laminated.

  The present invention relates to a waterproof structure for a vehicle display device that displays vehicle information, and provides a waterproof structure for a vehicle display device that suppresses deterioration of an adhesive member and has excellent waterproof properties.

Sectional drawing which shows the indicator which is embodiment of this invention. Sectional drawing which shows the waterproofing member which penetrates wiring of the indicator same as the above.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing a display (vehicle display device) A mounted on a two-wheeled vehicle. The indicator A is installed near the center of the handle of the two-wheeled vehicle and is likely to be exposed to rainwater, etc., and includes a liquid crystal display panel (display means) 1, a case 2, a circuit board 3, a grommet (waterproof member) 4, and wiring 5 And a wiring pipe 6, a screw 7, and a fixing member 8.

  The liquid crystal display panel 1 is provided near the center of the steering wheel so that a user of a two-wheeled vehicle can visually recognize, remaining energy capacity (remaining fuel amount), vehicle traveling speed, indicators indicating the state of each mechanism, and alarm contents The vehicle information such as is displayed as an image. In addition, the liquid crystal display panel 1 is connected to the circuit board 3 to obtain a drive signal, and can be displayed by being transmitted and illuminated by the backlight 11 mounted on the circuit board 3.

  In this case, the turning panel 12 for covering the area other than the display area of the liquid crystal display panel 1 or the optical member 13 such as a light diffusing sheet between the liquid crystal display panel 1 and the backlight 11 is used for illumination. Unevenness is reduced to improve the visibility of the liquid crystal display panel 1.

  In this case, the liquid crystal display panel 1 is driven and controlled using thin film transistors, and can switch the screen according to the operation of a vehicle user not described in detail or the state of the vehicle and output a desired display.

  The case 2 includes a display side case 21 and a back side case 22, and holds and stores the liquid crystal display panel 1 and the circuit board 3.

  The display-side case 21 has a window portion 21a that transmits the display output of the liquid crystal display panel 1 and a fixing portion (mounting hole) 21b for connection to the rear-side case 22, and in this case, the window portion A transparent synthetic resin material 21a is insert-molded to form a light-shielding fixing portion 21b.

  The back side case 22 is formed using a light shielding (colored) synthetic resin material, and can hold the liquid crystal display panel 1 and the circuit board 3 with screws or hooks (not shown). In addition, the display-side case 21 can be assembled so that the display-side case 21 covers and covers the back-side case 22 from the liquid crystal display panel 1 side while the rear-side case 22 is fixedly held.

  In this case, the back side case 22 has a waterproof packing 22a interposed around the contact portion with the display side case 21 on the side surface, and is screwed to the fixing portion 21b so as to be watertight with the display side case 21. Connected. On the back side of the back side case 22, there are provided an opening 22b facing a connector of the circuit board 3 to be described later, an edge 22c for fitting the grommet 4, and a concave groove 22d provided concentrically with the edge 22c. ing. The edge 22c and the groove 22d are formed over a week so as to surround the opening 22b.

  The circuit board 3 is held by the back side case 22 at a position spaced apart from the liquid crystal display panel 1 by a spacer 31, and a hard print in which circuit wiring made of a copper foil pattern is printed on a board using glass epoxy resin. It consists of a wiring board.

  The circuit board 3 is connected to the liquid crystal display panel 1 via a wiring (not shown), and drives an interface circuit, a microcomputer (calculation means) for inputting vehicle information and calculating with a predetermined program, and the liquid crystal display panel 1. A driving circuit for controlling, a backlight 11 for illuminating the liquid crystal display panel 1, and a plurality of wirings 5 for inputting an external signal (vehicle information) and supplying power from the vehicle are connected. An electronic component such as a connector 33 is mounted. The connector 33 is provided at a position corresponding to the opening 22 b of the back side case 22.

  The grommet 4 is made of an elastic material made of synthetic rubber. The grommet 4 is provided with a fitting portion 41 that contacts along the shape of the edge portion 22c and the groove portion 22d of the case 2 on one end side. A cylindrical inner wall portion 42 having a small diameter is provided on the other end side. Moreover, the outer wall part 43 which covers the outer periphery of this inner wall part 42 is provided, and the outer wall part 43 can be bent and deformed as shown in FIG. Moreover, the connection part 44 which connects the fitting part 41 and the inner wall part 42 in inclined shape (conical shape) is provided. In addition, the grommet 4 can also apply the resin material which has elasticity instead of a synthetic rubber.

  In this case, the fitting portion 41 is provided with a convex portion 42 a corresponding to the shape of the groove portion 22 d of the back side case 22. Further, the grommet 4 has a cylindrical shape in which both ends of the fitting part 41 side and the inner wall part 42 side are open, and a connector 33a corresponding to the connector 33 mounted on the circuit board 3 and a plurality of connection terminals (not shown). It covers the wiring 5 connected to the. Further, in the assembled state shown in FIG. 1, the one end opening of the fitting portion 41 is watertightly fitted by the edge portion 22c and the groove portion 22d of the case 2, and the other end opening portion of the inner wall portion 42 is fitted. The tape T and the wiring pipe 6 are provided without gaps.

  The wiring 5 is a plurality of coated wire cords connected to the connector 33a, and is used as a power supply line or various signal lines. In this case, the wiring 5 is bundled in the vicinity of the connector 33a, and the grommet 4 and the wiring tube 6 are inserted to make electrical connection between the display A and the external device. Further, the connector 33 a side of the wiring 5 is covered with the grommet 4 in particular.

  The wiring tube 6 is made of synthetic rubber, and in a state of being fitted on the inner wall portion 42 of the grommet 4, the tape T is wound together with the inner wall portion 42 to prevent moisture and the like from entering the interior, and the connected state is maintained. The At this time, the operation of winding the tape T can be easily performed by bending the outer wall portion 43. In addition, by forming a slit in the outer wall portion 43, the bending work can be facilitated. The wiring tube 6 is preferably made of a flexible member such as synthetic rubber so as not to impair the bending of the wiring 5. However, the wiring tube 6 is waterproof and has a cylindrical shape through which the wiring 5 is inserted. It can be replaced if there is. For example, when the wiring 5 does not need to be bent, a hard material made of synthetic resin or the like can be applied.

  In addition, after fixing the wiring pipe 6 to the grommet 4 with the tape T, the outer wall part 43 is returned to the original and the end part of the wiring pipe 6 wound with the tape T is covered. In this case, the tape T is entirely covered by the outer wall portion 43, and the irradiation with sunlight and the adhesion of water and dust are reduced, and the tape T is hidden in appearance.

  The screw 7 is connected to the pair of connectors 33 and 33a from the state shown in FIG. 1, the fitting portion 41 is fitted into the edge portion 22c, and a part of the fitting portion is inserted into the groove portion 22d of the back side case 22. It is an attachment tool for assembling the display A to the vehicle in the state where The screw 7 is screwed together with the display monitor A together with a metal frame (frame member) B into a fixing portion (mounting hole) 22e provided in the rear case 22, and is displayed on the metal frame B as shown in FIG. Device A is assembled.

  The metal frame B is inserted through the fitting portion 41 of the grommet 4 and the notch (hole) B1 for holding the fitting portion 41 in the opening 2b of the case 2 and the fixing member similar to the screw 7 described above. A plurality of holes B2 are prepared. In this case, the cutout portion B1 is provided so that the metal frame B hits the fitting portion 41 over one round. In addition, a plurality of holes B2 and corresponding fixing portions 22e are provided around the opening 22b, and at least one of them is provided in the vicinity of the fitting portion 41. Can be deformed by strongly compressing.

  Therefore, by assembling the display A with the screw 7, the periphery of the notch B1 can be fixed and held in a state where the grommet 4 is compressed and elastically deformed as part of the grommet 4 as a restraining part, and further watertight Can be obtained. Further, since the grommet 4 is sandwiched between the case 2 and the metal frame B, and the grommet 4 is difficult to be removed by the fitting portion 41 that has entered the groove 22d, strong vibration of the vehicle body and the wiring 5 A waterproof structure can be secured even if some extrusion occurs. When the indicator A is removed from the vehicle body, the connector can be easily attached and detached simply by releasing the fitting of the grommet 4 with the case 2. Further, the metal frame B is continuously provided with an arm portion B3 for holding the grommet by the fixing member 8.

  A binding band or a clamp can be applied to the fixing member 8, and the portion where the wiring tube 6 and the tape T are laminated between the inner wall portion 42 and the outer wall portion 43 is bundled and fixed from the outer periphery of the outer wall portion 43. At this time, by interposing the arm portion B between the fixing member 8 and the outer wall portion 43, the positions of the deformable grommet 4, the wiring 5, and the wiring tube 6 can be regulated.

  In particular, bundling including the wiring tube 6 is advantageous for preventing the wiring tube 6 from coming off. Further, the tape T is covered with the outer wall 43 of the grommet 4 so as to prevent the irradiation of sunlight and the attachment of water, dust, etc., so that the tape T can not only suppress deterioration but also a fixing member. It is possible to prevent peeling due to bundling from the outside by 8. Further, since the tape T and the wiring 5 are covered with the grommet 4 and the wiring pipe 6, the appearance is not complicated and an orderly impression can be given.

  In the waterproof structure of such a vehicle display device (display), a liquid crystal display panel 1 that displays vehicle information, and a case 2 that houses the liquid crystal display panel 1 so that the display by the liquid crystal display panel 1 can be visually recognized, A wiring 5 for connecting to the outside of the case 2, a circuit board 3 that is housed in the case 2, is connected to the wiring 5, and mounts an electronic component that drives the liquid crystal display panel 1, and a wiring that passes through the wiring 5 The tube 6 and an elastically deformable grommet 4 that covers the opening 22 b of the case 2 through which the wiring tube 6 is inserted. The grommet 4 has a cylindrical inner wall portion 42 for fixing the wiring tube 6 with the tape 4. And an outer wall 43 that covers the tape 4.

  Therefore, for example, even when applied to a display that is easily exposed to raindrops mounted on a two-wheeled vehicle or the like, the tape portion is prevented from being exposed, and the exhaust heat of the vehicle, sunlight, rainwater, tape aging Deterioration due to changes, etc. can be suppressed, adhesiveness with tape can be maintained, deterioration of the adhesive member is suppressed, and dust and moisture are less likely to enter through the gaps in the grommet 4, so that the vehicle has excellent waterproof properties. A waterproof structure of the display device is provided. Further, it is possible to prevent the appearance quality from being deteriorated, such as partial peeling of the tape and dirt adhering to the adhesive portion.

  Further, the fixing member 8 that binds from the outer periphery of the outer wall portion 43 is provided at the position where the inner wall portion 42 and the outer wall portion 43 of the tape T, the wiring pipe 6 and the grommet 4 are laminated, so that the outer wall portion 43 and the tape are provided. Adhesiveness with T and the wiring pipe 6 can be improved, and the above-described effects can be enhanced.

  The waterproof structure of the display device for a vehicle according to the present invention has been described as an example in the configuration of the above-described embodiment, but the present invention is not limited to this, and the gist of the present invention is also achieved in other configurations. It goes without saying that various improvements and display changes can be made without departing from the scope of the invention. For example, although the example which applied the tape T as an adhesive member was given, you may substitute for what apply | coats a resin adhesive and performs joining by hardening. In this case, not only the inner wall portion of the grommet and the wiring tube are joined, but also the waterproof property can be enhanced by joining the wiring tube and the outer wall portion of the grommet. In particular, damage due to heat of the adhesive can be reduced, deterioration of the bonding state can be suppressed, and the same effects as those of the above-described embodiment can be obtained.

  The present invention relates to a vehicle display device that is mounted on a vehicle and displays various vehicle information, and can be applied, for example, as a waterproof structure for a display device mounted on a mobile body including an automobile, a motorcycle, an agricultural machine, or a construction machine. In particular, it is suitable as a waterproof structure for a special vehicle such as a construction machine, a watercraft such as a water bike, a snowmobile, a ship, or a motorcycle, or a meter that is used in an environment exposed to raindrops.

1 Liquid crystal display panel (display means)
2 Case 3 Circuit board 4 Grommet (waterproof material)
5 Wiring 6 Wiring pipe 7 Screw 8 Fixing member A Indicator (vehicle display device)
T tape (adhesive member)

Claims (2)

Display means for displaying vehicle information;
A case for storing the display means so that the display by the display means can be visually recognized;
Wiring to connect to the outside of this case,
A circuit board that is housed in the case and is mounted with electronic components that are connected to the wiring and drive the display means;
A conduit tube through which the wiring is inserted;
An elastically deformable waterproof member that covers the opening of the case through which the wiring tube is inserted, and
The waterproof structure for a display device for a vehicle, wherein the waterproof member includes a cylindrical inner wall portion for fixing the wiring tube with an adhesive member, and an outer wall portion covering the adhesive member.   The fixing member that binds from the outer periphery of the outer wall portion is provided at a position where the inner wall portion and the outer wall portion of the adhesive member, the wiring pipe, and the waterproof member are laminated. The waterproof structure of the display apparatus for vehicles as described.

Images