JP2013196888A - On-vehicle electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle electronic apparatus which is used by being connected with a connector of a wiring harness, and prevents a damage at a connection between a board and a connector of the board due to a force applied to the wiring harness being transmitted to the connector of the board.SOLUTION: An upper case 50 and a separate cover 60 are prepared, and the cover is fixed to the upper case. A wiring harness contact face is formed on the cover to contact connectors 70, 75 of a wiring harness connected to connectors 40, 45 of a board so as to prohibit movement of the connectors of the wiring harness. A force applied to the wiring harness is transmitted from the connectors 70, 75 of the wiring harness to a case via the cover 60, and not transmitted to the connectors 40, 45 of the board.

Description

  In the present specification, an electronic device used in a vehicle is disclosed.

  An electric vehicle, a hybrid vehicle, a fuel cell vehicle, and the like include a traveling motor, and an electronic device that applies a driving current to the traveling motor is mounted on the vehicle. In-vehicle electronic devices are used by connecting to a large number of input / output signal lines. The input / output signal lines are bundled to form a wire harness, and a wire harness side connector is prepared at the tip thereof. The in-vehicle electronic device is used by connecting to the wire harness side connector.

  The electronic device is provided with a connector for connecting to the wire harness side connector. Patent Document 1 discloses a technique for fixing a connector on the electronic device side to a substrate. The electronic device is mounted on the substrate, and the connection relationship between the substrate and the connector is simplified if the electronic device side connector is fixed to the substrate. The substrate is accommodated in the case. In order to allow the wire harness side connector to be connected to an electronic device side connector (because it is fixed to the substrate, hereinafter referred to as a substrate side connector) fixed to the substrate accommodated in the case, Patent Document 1 In this technique, an opening is provided in the case, and the board side connector and the wire harness side connector can be connected using the opening.

  When in-vehicle, external force is applied to the wire harness. As a result, an external force propagates from the wire harness to the board side connector via the wire harness side connector, and a force may act between the board side connector and the board. As a result, the solder or the like that fixes the board and the board-side connector may be damaged, and the wiring formed on the board and the board-side connector may be poorly connected.

  Patent Document 1 discloses a technique for fixing a board-side connector to a case. If the board-side connector is fixed to the case, the external force applied to the wire harness can be received by the case. It is possible to prevent an external force applied to the wire harness from acting between the board and the board-side connector.

JP 2006-331803 A

  In the technique of Patent Document 1, the board-side connector is fixed to the board, and both the board and the board-side connector are fixed to the case. In order to realize this structure, the positional relationship between the board and the board-side connector is strictly controlled, and the relative positional relationship between the position where the board is fixed to the case and the position where the board-side connector is fixed to the case is strictly managed. There is a need. In the technique of Patent Document 1, high accuracy is required for the case shape.

In-vehicle electronic devices generally have a complicated shape because of the necessity to be mounted in a narrow space. It is difficult to finish complex shapes with high accuracy. It is necessary to ensure the shape accuracy by making cutting possible after forming. The manufacturing cost of the case increases.
In the present specification, a technique for reducing the required accuracy related to the shape of a case having a complicated shape is disclosed. For example, a technique that can be manufactured with a precision that can be manufactured by a casting technique is disclosed.

The electronic device disclosed in the present specification is mounted on a vehicle and used in a state of being connected to the wire harness side connector. The electronic device includes a board-side connector to which the wire harness-side connector is connected, a board to which the board-side connector is fixed, a case that houses the board, and a cover that is separate from the case. The cover is fixed to the case.
The case has an opening that allows the wire harness side connector to be inserted into and removed from the board side connector. The cover is also formed with an opening that allows the wire harness side connector to be inserted into and removed from the board side connector. The cover is formed with a wire harness side contact surface that prohibits the wire harness side connector from moving by contacting the wire harness side connector connected to the board side connector. Alternatively, a board-side contact surface that prohibits movement of the board-side connector in contact with the board-side connector is formed.

In the electronic device disclosed in this specification, the case and the cover are separate and can be prepared individually. The case can be manufactured with rough shape accuracy, and the cover can be manufactured with high shape accuracy.
When the cover-side contact surface is formed on the cover, even if an external force applied to the wire harness propagates to the board-side connector via the wire harness-side connector, the force is received by the case via the cover. It can suppress that the external force added to the wire harness acts between a board | substrate side connector and a board | substrate.
When the wire harness side contact surface is formed on the cover, even if an external force applied to the wire harness propagates to the wire harness side connector, the force is received by the case via the cover. Propagation of external force applied to the wire harness to the board-side connector can be suppressed.
According to the above, the required accuracy related to the case shape is relaxed, and the manufacturing cost of the case can be reduced.

  A shape in which only the wire harness side contact surface is formed on the cover and the substrate side contact surface is not formed is also effective. In that case, the external force applied to the wire harness propagates to the case via the wire harness side connector and the cover, and does not propagate to the board side connector. Although the board-side contact surface exists, when the contact range is narrow, it is possible to effectively suppress the external force from propagating to the board-side connector.

Both the wire harness side contact surface and the substrate side contact surface may be formed on the cover.
In this case, the cover functions as a means for adjusting the relative positional relationship between the wire harness side connector and the board side connector to a constant level, and the external force applied to the wire harness propagates to the board side connector via the wire harness side connector. It functions as a means for suppressing the force from acting between the board-side connector and the board even if an external force propagates to the board-side connector.

The case is preferably a cast product. If the case is a cast product, an electromagnetic wave shielding effect is obtained according to the metal case, and electromagnetic noise countermeasures are advantageous. Also, according to the casting case, it is easy to ensure the required strength.
On the other hand, the cover is preferably a resin molded product. Resin molded products are easy to ensure high shape accuracy. It is easy to ensure the shape accuracy capable of prohibiting the wire harness side connector and / or the board side connector from coming into contact with the connector and displacing them. Although resin molded products are disadvantageous in terms of electromagnetic noise countermeasures and strength, they can be compensated with a metal case.

When positioning the wire harness side connector with the cover, it is preferable that a sealing material is disposed between the case and the cover. Moreover, it is preferable that a sealing material is disposed between the cover and the wire harness side connector in a state where the wire harness side connector is connected to the board side connector.
In this case, water can be prevented from entering the case from between the case and the cover, and water can be prevented from entering the case from between the cover and the connector.

  According to the in-vehicle electronic device disclosed in the present specification, a case that accommodates the substrate and a cover that contacts the connector and transmits a force acting on the connector to the case can be separately prepared. Since a case suitable for the case can be prepared for the case, and a cover suitable for the cover can be prepared for the cover, it is possible to prepare lean parts for each case. In-vehicle electronic devices can be manufactured at low cost.

The disassembled perspective view of the vehicle-mounted electronic device of an Example is shown typically. FIG. 2 schematically shows a cross section taken along line II-II with respect to the cover 60 of FIG. A perspective view of the surface side of cover 60 is typically shown. A perspective view of the back side of cover 60 is typically shown.

The main features of the embodiments shown below are listed.
(Feature 1) The cover prevents the wire harness side connector from being displaced relative to the substrate by contacting the wire harness side connector.
(Feature 2) While the cover prevents the wire harness side connector from being displaced relative to the board by contacting the wire harness side connector, the area where the cover and the board side connector are in contact with each other is small. Force is difficult to propagate.
(Feature 3) The cover is positioned with reference to the board side connector, and positions the wire harness side connector. The relative positional relationship between the board side connector and the wire harness side connector is adjusted to be constant by the cover.

  FIG. 1 schematically shows an exploded perspective view of the in-vehicle electronic device 99, and includes a lower case 20, a substrate 30, substrate-side connectors 40 and 45, an upper case 50, and a cover 60. The electronic device 99 is mounted on the vehicle and used by connecting the wire harness side connectors 70 and 75.

  The board-side connectors 40 and 45 are fixed to the board 30. A plurality of pins extend from the lower surfaces of the board-side connectors 40 and 45, and each pin is connected to a wiring pattern formed on the board 30 by solder.

  The substrate 30 is fixed to the lower case 20. The upper case 50 is fixed to the lower case 20. When the upper case 50 is fixed to the lower case 20, the case is completed, and a state in which the substrate 30 is accommodated in the case is obtained. The upper case 50 is provided with an opening 56, and the board-side connectors 40 and 45 face the opening 56. The cover 60 is fixed to the upper case 50 and includes an opening 65 for receiving the wire harness side connector 70 and an opening 64 for receiving the wire harness side connector 75. When the wire harness side connector 70 is inserted into the opening 65 of the cover 60, the wire harness side connector 70 and the board side connector 40 are connected via the openings 65 and 56. When the wire harness side connector 75 is inserted into the opening 64 of the cover 60, the wire harness side connector 75 and the board side connector 45 are connected via the openings 64 and 56.

  When the wire harness side connector 70 is inserted into the opening 65 of the cover 60, the wire harness side connector 70 is restricted from contacting the cover 60 and being displaced with respect to the cover 60. The cover 60 is fixed to the case. When an external force is applied to the wire harness 90 and the wire harness side connector 70 is about to be displaced, the force is transmitted to the case. The external force applied to the wire harness 90 is prevented from acting between the board side connector 40 and the board 30 via the wire harness side connector 70 and the board side connector 40. Similarly, the cover 60 suppresses an external force applied to the wire harness 95 from acting between the board-side connector 45 and the board 30 via the wire harness-side connector 75 and the board-side connector 45.

In FIG. 1, although the shapes of the lower case 20 and the upper case 50 are simplified, they are actually complicated shapes. Since the substrate 30 needs to be electromagnetically shielded and high strength is required, it is manufactured by aluminum die casting.
The cover 60 is a resin molded product and has high shape accuracy. It has a shape accuracy sufficient to restrict displacement of the wire harness side connectors 70 and 75 relative to the cover 60 by contacting the wire harness side connectors 70 and 75.

  As will be described later with reference to FIG. 2 and the like, a seal ring is disposed between the upper case 50 and the cover 60 to prevent water from entering the case through the gap between them. When the wire harness side connector 70 is inserted into the opening 65 of the cover 60, a seal ring is disposed between the cover 60 and the wire harness side connector 70, and water is prevented from entering the case from the gap between the two. Similarly, when the wire harness side connector 75 is inserted into the opening 64 of the cover 60, a seal ring is disposed between the cover 60 and the wire harness side connector 75, thereby preventing water from entering the case 59 from the gap between the two. To do.

  As shown in FIG. 2, the lower case 20 is formed with ribs 22 that support the substrate 30. A screw hole is opened on the upper surface of the rib 22, and the screw hole extends along the rib 22. The substrate 30 is fixed to the upper surface of the rib 22 by screws 32.

A board-side connector 40 is fixed to the board 30. A plurality of pins 43 extend from the lower surface of the board-side connector 40. The substrate 30 is formed with through holes 34 for receiving the pins 43. A wiring pattern is formed on the back surface of the substrate 30, and lands are formed at the ends of the wiring pattern. The through hole 34 is located in the land. A lower pin 43 of the board side connector 40 is inserted into the through hole 34 of the board 30, and the tip of the pin 43 protrudes from the lower surface of the board 30. The protrusion and the land are connected by solder. The board-side connector 40 is mechanically fixed to the board 30 by solder. Further, the lower pin 43 of the board-side connector 40 and the wiring pattern formed on the board 30 are electrically connected by solder.
A plurality of pins 42 extend upward from the upper surface of the board-side connector 40. The pin 42 is a contact pin that is inserted into the wire harness side connector 70 to ensure conduction. A wall 41 is formed on the upper surface of the board-side connector 40 so as to go around the plurality of pins 42. Each of the upper surface side pins 42 is electrically connected to the corresponding lower surface side pin 43 inside the board side connector 40. Each of the upper surface side pins 42 is electrically connected to the wiring pattern formed on the substrate 30.
A second board side connector 45 is also fixed to the board 30. The fixing structure with respect to the board is the same as that of the board-side connector 40, and redundant description is omitted. The relationship between the upper surface side pin and the lower surface side pin is also the same, and redundant description is omitted. The reference numeral 47 is attached to the upper surface side pin of the second board side connector 45, the reference number 48 is attached to the lower surface side pin, and the reference numeral 46 is attached to the wall that goes around the upper surface side pin 47. Is attached.

  The upper case 50 is put on the lower case 20 to which the substrate 30 is fixed, and both are fixed by screws 58. As a result, the case 59 is closed, and the substrate 30 is accommodated in the case 59. In this state, a part of the board-side connectors 40 and 45 extends to the outside of the case 59 through the opening 56. The opening 56 is formed in a size and shape that allow the board-side connectors 40 and 45 to pass with a margin. The shape accuracy of the opening 56 is sufficient even if it is rough, and can be manufactured without difficulty by aluminum die casting.

  A cover 60 is fixed to the upper surface of the upper case 50. The cover 60 is a resin molded product and has high shape accuracy. The cover 60 is formed with an opening 65 through which the board-side connector 40 and the wire harness-side connector 70 can pass, and a wall 66 that goes around the opening 65. Further, an opening 64 through which the board-side connector 45 and the wire harness-side connector 75 can pass, and a wall 63 that goes around the opening 64 are formed. Further, the cover 60 is in close contact with the board-side connector 40 to adjust the relative positional relationship between them to be constant, and the cover 60 is in close contact with the wire harness-side connector 70 to adjust the relative positional relationship between them to be constant. A contact surface 66a, a contact surface 63b that is in close contact with the board-side connector 45 to adjust the relative positional relationship between them to a constant, and a contact that is in close contact with the wire harness side connector 75 to adjust the relative positional relationship between them to be constant. A surface 63a is provided. The contact surfaces 66 b and 66 a are formed on a part of the wall 66, and the contact surfaces 63 b and 63 a are formed on a part of the wall 63.

Ribs 54 and 55 for fixing the cover 60 are formed in the upper case 50. The cover 60 is provided with a portion 61 for receiving the rib 54 and a portion 67 for receiving the rib 55, and the cover 60 is fixed to the upper case 50 by tightening the screws 91 and 93.
However, the fixing position of the cover 60 and the upper case 50 can be adjusted. That is, the position of the cover 60 can be adjusted with respect to the rib 54 and the rib 55. Actually, prior to tightening the screws 91 and 93, the contact surface 66b of the cover 60 is brought into close contact with the board-side connector 40, and the contact surface 63b of the cover 60 is brought into close contact with the board-side connector 45. Accordingly, the cover 60 is positioned with respect to the board-side connectors 40 and 45, and the screws 91 and 93 are tightened at the positions to fix the cover 60 to the upper case 50. As described above, when the cover 60 is fixed to the upper case 59 made of aluminum die cast having a low shape accuracy, the cover 60 is fixed in a state where the positional relationship between the cover 60 and the board side connectors 40 and 45 is adjusted to be constant. I am doing so.

When the screws 91 and 93 are tightened, the silicon seal ring 90 is disposed between the cover 60 and the upper case 50 in a compressed state. The seal ring 90 can prevent water from entering the case 59 from between the cover 60 and the upper case 50. As shown in FIG. 4, the silicon seal ring 90 is inserted into a groove 90 a formed on the back surface of the cover 60. According to the waterproof structure described above, the waterproof performance of the gap between the cover 60 and the cover 60 can be obtained even in the case 59 made of aluminum die cast having a rough shape accuracy. Since waterproofing is performed with the seal ring 90, the space between the upper case 50 and the cover 60 can be securely waterproof as long as the flatness of the upper case 50 is ensured at the portion that contacts the seal ring 90. Even in a case 59 made of aluminum die cast having a rough shape accuracy, the gap with the cover 60 can be waterproofed firmly.
In addition, 62 and 68 of illustration are metal cylinders, and are integrally molded by the cover 60. FIG. The inner diameter is larger than the diameters of the screws 91 and 93, and the position of the cover 60 can be adjusted with respect to the ribs 54 and 55.

The wire harness side connector 70 includes a block 72 having a side surface that is in close contact with the contact surface 66 a of the cover 60, and an outer wall 71 that covers the outside of the wall 66 of the cover 60. In the block 72, a plurality of receiving ports 74 in which metal is disposed on the inner wall and a plurality of wirings 73 that are electrically connected to the metal are disposed. A plurality of wirings 73 are bundled to form a wire harness 90. The plurality of receiving ports 74 are formed at positions corresponding to the plurality of upper surface side pins 42 of the board side connector 40.
When the wire harness side connector 70 is inserted into the opening 65 of the cover 60, the following event occurs.
(1) The plurality of upper surface side pins 42 of the board side connector 40 are inserted into the plurality of receiving ports 74 of the wire harness side connector 70, and the wiring 73 and the wiring pattern formed on the board 30 are electrically connected.
(2) The side surface of the block 72 of the wire harness side connector 70 is in close contact with the contact surface 66a of the cover 60, and the relative positional relationship between the wire harness side connector 70 and the cover 60 is adjusted to a desired relationship and fixed.
(3) The outer wall 71 of the wire harness side connector 70 covers the outside of the wall 66 of the cover 60.
When the wire harness side connector 70 is inserted into the opening 65 by the position adjusting function of (2), the relative positional relationship between the wire harness side connector 70 and the board side connector 40 is adjusted to a desired positional relationship, so that both can be used without difficulty. Connected.
Further, the wire harness side connector 70 connected to the board side connector 40 is fixed to the cover 60 (and thus the case 59) by the position fixing function (2), and even if an external force is applied to the wire harness 90, the wire harness The side connector 70 is restricted from being displaced with respect to the board side connector 40 (and thus the board 30). It is possible to prevent a force from acting between the board-side connector 40 and the board 30. This prevents the solder or the like that fixes the board-side connector 40 and the board 30 from being damaged.
Further, according to the above (3), it is possible to prevent rainwater from directly entering the gap between the side surface of the block 72 and the contact surface 66a of the cover 60. A seal ring 92 that goes around the block is inserted in the side surface of the block 72 to prevent water from entering the case 59 from between the side surface of the block 72 and the contact surface 66a of the cover 60. Since the outer wall 71 can also prevent the rainwater from directly spraying the gap between the side surface of the block 72 and the contact surface 66a of the cover 60, high waterproof performance can be obtained.
The relationship between the second wire harness side connector 75 and the cover 60 is also the same, and redundant description is omitted.

  Reference numeral 80 in FIG. 2 indicates a locking member. The lock member is pushed down toward the cover 60 from the upper part of the wire harness side connectors 70 and 75. Then, the tip part engages with a retaining member 69 formed on the cover 60. As a result, the wire harness side connectors 70 and 75 are firmly positioned with respect to the board side connectors 40 and 45. The wire harness side connectors 70 and 75 do not come out of the board side connectors 40 and 45 unintentionally. Openings 71 a and 76 a are formed in the outer walls 71 and 76 of the wire harness side connectors 70 and 75 to allow the lock member 80 to engage with the stopper 69 of the cover 60.

As shown in FIGS. 3 and 4, the cover 60 is required to have the following various functions and has a complicated shape.
(1) The cover 60 is positioned by the board-side connectors 40 and 45.
(2) The wire harness side connectors 70 and 75 are positioned by the cover 60.
(3) The positioned wire harness side connectors 70 and 75 are fixed at the position and not displaced.
(4) Waterproofing the gap with the case 59 (5) Waterproofing the gap with the wire harness side connectors 70 and 75 (6) Preventing rainwater from directly covering the gap of (5) (7) Engage with the lock member.
When the shape necessary for the above function is manufactured by aluminum die casting, complicated cutting or the like is required, and the manufacturing cost increases. In this embodiment, since the case 59 and the cover 60 are separated, it is possible to manufacture parts suitable for each at low cost.

  In the above-described embodiment, the cover 60 contacts the board-side connectors 40 and 45, adjusts and fixes the relative position to be fixed, and contacts the wire harness-side connectors 70 and 75. Both contact surfaces 63a and 66a that fix the target position to be fixed are formed. However, while the contact areas of the contact surfaces 63b and 66b are narrow, the contact areas of the contact surfaces 63a and 66a are widely secured. For this reason, the external force acting on the wire harness side connectors 70 and 75 is transmitted to the cover 60, but is difficult to be transmitted from the cover 60 to the board side connectors 40 and 45.

In the above embodiment, the cover 60 fixed to the case 59 restricts both the wire harness side connectors 70 and 75 and the board side connectors 40 and 45 from being displaced with respect to the board 30. Instead of this, the cover 60 fixed to the case 59 may restrict the displacement of the wire harness side connectors 70 and 75 relative to the cover 60. The contact surfaces 63b and 66b that contact the board-side connectors 40 and 45 may be removed. Alternatively, displacement of the board-side connectors 40 and 45 relative to the cover 60 may be restricted by the cover 60 fixed to the case 59. In any case, the board-side connectors 40 and 45 can be finally restricted from being displaced with respect to the board 30.
In the above embodiment, the case where two board-side connectors and two wire harness-side connectors are prepared has been described, but the number of connectors is not limited. One or three or more may be used.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

20: Lower case 22: Rib 30: Board 34: Through hole 40, 45: Board side connector 41, 46: Round wall 42, 47: Upper side pin 43, 48: Lower side pin 50: Upper case 54, 55: Boss 56: Opening 59: Case 60: Cover 63, 66: One-round wall 64, 65: Opening 63a, 63b, 66a, 66b: Contact wall 69: Claw 70, 75: Wire harness side connector 71, 76: Outer wall 72, 77 : Blocks 73 and 78: Wiring 74 and 79: Receiving part 80: Lock member 90 and 95: Wire harness

Claims (4)

It is an in-vehicle electronic device to which the wire harness side connector is connected,
A board-side connector to which the wire harness-side connector is connected;
A board to which the board-side connector is fixed, and
A case containing a substrate,
It has a cover fixed to the case,
The case has an opening that allows the wire harness side connector to be inserted into and removed from the board side connector.
The cover is also formed with an opening that allows the wire harness side connector to be inserted into and removed from the board side connector, and is in contact with the wire harness side connector connected to the board side connector. At least one of a wire harness-side contact surface that prohibits movement and a substrate-side contact surface that contacts the substrate-side connector and prohibits movement of the substrate-side connector is formed.   The in-vehicle electronic device according to claim 1, wherein both the wire harness side contact surface and the substrate side contact surface are formed on the cover.   The in-vehicle electronic device according to claim 1, wherein the case is a cast product and the cover is a resin molded product.   The in-vehicle electronic device according to any one of claims 1 to 3, wherein a sealing material is disposed between the case and the cover, and the sealing material is disposed between the cover and the wire harness side connector. machine.

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