JP6147703B2 - Tire condition detection device - Google Patents

Description

  The present invention relates to a tire condition detection device having an electronic component including a sensor that detects a condition of a tire.

  As a device for enabling a driver to check the state of a plurality of tires provided in a vehicle, a wireless communication type tire state monitoring device has been proposed. In a wireless communication type tire condition monitoring device, a tire condition detection device provided on a vehicle wheel detects a tire condition and transmits the detected tire condition to a receiver provided on a vehicle body or the like. The receiver issues a warning to the driver when there is an abnormality in the tire condition transmitted from the tire condition detection device.

  In the tire state detection device of Patent Document 1, an inner bottom surface (bottom plate) of a bottomed box type case is a component mounting surface, and a wiring pattern is formed on the inner bottom surface of the case. A pressure sensor for detecting the tire air pressure is mounted on the inner bottom surface, and tire air pressure information detected by the pressure sensor is transmitted to the receiver. In Patent Document 1, an electronic component is not mounted on a substrate, but an electronic component is mounted on a bottom plate of a case, so that the bottom plate is also used as a substrate. For this reason, in patent document 1, it is not necessary to ensure the area | region which accommodates a board | substrate in a case, and size reduction of the tire state detection apparatus is achieved.

JP 2007-278761 A

  By the way, in the tire state detection device of Patent Document 1, as a method of mounting the electronic component on the inner bottom surface of the case, for example, there is reflow soldering. When reflow soldering is performed, a metal mask is disposed on the inner bottom surface of the case, and cream solder is applied to the inner bottom surface of the case by pouring cream solder into a hole formed in the metal mask. However, when applying cream solder to the inner bottom surface of the case, the movement of the squeegee that moves along the metal mask is obstructed by the side wall of the case, and the application of the cream solder is very troublesome, and mounting of electronic components is difficult. Have difficulty.

  An object of the present invention is to provide a tire state detection device in which electronic components can be easily mounted.

A tire condition detection device that solves the above problems includes an electronic component that includes a sensor that detects the condition of a tire, and an opening of a bottomed cylindrical case body that is closed with a flat lid as a substrate, and the electronic component is And a housing case, wherein the electronic component is mounted on the lid.

  According to this, for example, when an electronic component is mounted on the lid by soldering, the lid is not provided with a wall or the like around it unlike the case body. For this reason, the movement of the instrument for mounting with respect to the lid is not hindered, and the operation using the instrument is easy to perform. For this reason, an electronic component can be easily mounted on the lid.

About the said tire state detection apparatus, it is preferable that the said electronic component is embed | buried under the said cover.
According to this, since the electronic component can be provided within the thickness of the lid, the tire state detection device can be reduced in size as compared with the case where the electronic component protrudes outside the lid.

  About the tire condition detecting device, a battery having an electrode terminal extending toward a wiring pattern provided on an inner surface of the lid and electrically connected to the wiring pattern is provided in the case, and the electrode terminal is It is preferable that the cover is pressed toward the bottom of the case.

  According to this, since the electrode terminal is pressed to the wiring pattern by being pressed by the lid, the electrical connection can be maintained without connecting the electrode terminal to the wiring pattern by solder or the like. For this reason, manufacture of a tire condition detection apparatus becomes easy.

In the tire condition detection device, it is preferable that one of the case main body and the lid has a groove, and the other has a protruding portion inserted into the groove.
According to this, the case body and the lid can be positioned by inserting the protruding portion into the groove.

About the said tire state detection apparatus, it is preferable that the said lid | cover is laser-welded to the said case main body.
According to this, the sealing performance between the two can be ensured by welding the case main body and the lid. Therefore, in order to prevent the electronic components in the case from being exposed to the outside air, it is not necessary to fill the case with potting resin, and the weight of the tire state detection device can be reduced.

  According to the present invention, mounting of electronic components is facilitated.

The perspective view which shows the tire valve unit attached to the wheel for vehicles. Sectional drawing which shows a tire condition detection apparatus. The disassembled perspective view which shows a tire state detection apparatus. The perspective view which shows the electronic component mounted in the lid | cover. Sectional drawing which shows the tire state detection apparatus before a lid | cover is fixed to a case main body. Sectional drawing which shows a state when cream solder is apply | coated to a lid | cover.

Hereinafter, an embodiment of the tire state detection device will be described.
As shown in FIG. 1, the tire valve unit 10 is attached to a tire valve 13 attached to a rim 12 of a vehicle wheel 11, and attached to the tire valve 13, and in a tire 14 attached to the vehicle wheel 11. It is comprised from the tire state detection apparatus 20 arrange | positioned.

  As shown in FIG.2 and FIG.3, the tire state detection apparatus 20 has the case 21 which makes a box shape. The case 21 has a bottomed square cylindrical case main body 30 and a square flat plate-like lid 40 that closes the opening 31 of the case main body 30. The case main body 30 has a square plate-like bottom portion 32 and four side walls 33 to 36 erected from the periphery of the bottom portion 32. Of the four side walls 33 to 36, one of the pair of opposing side walls 33, 34 is a first side wall 33 and the other is a second side wall 34, and a pair of side walls 35 different from the first side wall 33 and the second side wall 34, When one side of 36 is the third side wall 35 and the other side is the fourth side wall 36, a concave portion 37 that is recessed in the thickness direction is formed on the inner surface of the first side wall 33. The recessed portion 37 extends over the entire standing direction from the bottom portion 32 of the first side wall 33. The second side wall 34 is formed with a protruding portion 38 that protrudes from the front end surface in the standing direction from the bottom portion 32. The protruding portion 38 extends linearly in the opposing direction of the third side wall 35 and the fourth side wall 36.

  Electronic components such as a temperature sensor 41, a transmitter 42, a pressure sensor 43, and an IC chip 44 are mounted on the lid 40. In the present embodiment, each electronic component is mounted on the lid 40 by reflow soldering. Hereinafter, the lid 40 will be described in detail.

  A wiring pattern 45 is provided on the mounting surface 40 a that is one surface in the thickness direction of the lid 40. The mounting surface 40a is a flat surface. In the wiring pattern 45, the temperature sensor 41 and the transmitter 42 are joined to the surface opposite to the surface in contact with the lid 40 by solder.

  A pressure sensor 43 and an IC chip 44 are embedded in the lid 40. The state in which the electronic component is accommodated in the case 21 includes a state in which the electronic component is embedded in the lid 40. The pressure sensor 43 and the IC chip 44 are provided with bumps 46 extending toward the mounting surface 40a. The bump 46 and the wiring pattern 45 are joined by solder. Thereby, the pressure sensor 43 and the IC chip 44 are joined to the wiring pattern 45. A pressure introduction port 47 extending toward the pressure sensor 43 is formed on the surface 40 b of the lid 40 opposite to the mounting surface 40 a. The pressure inlet 47 is open to the pressure sensor 43. The pressure sensor 43 has a pressure receiving portion exposed at the pressure inlet 47 and detects the pressure in the tire 14.

As shown in FIG. 4, the mounting surface 40 a of the lid 40 is provided with a groove 48 that opens in the thickness direction of the lid 40. The groove 48 extends linearly along one side of the four sides of the lid 40.
The lid 40 is fixed to the case main body 30 so that the mounting surface 40 a becomes the inner surface of the case 21, and the case 21 is configured by the case main body 30 and the lid 40 fixed to each other. A protrusion 38 of the case body 30 is inserted into the groove 48 of the lid 40. The lid 40 is laser welded to the case body 30.

  As shown in FIG. 2, a battery 50 is accommodated inside the case 21. The battery 50 has a cylindrical shape. When the direction in which the central axis of the cylinder extends is the axial direction of the battery 50, the metal first electrode terminal 52 is connected to the first end surface 50a of both surfaces in the axial direction of the battery 50, and the second end surface 50b is connected to the second end surface 50b. Is connected to a second electrode terminal 56 made of metal.

  The first electrode terminal 52 includes a plate-shaped first fixing portion 53 fixed to the first end surface 50a, and a plate-shaped first fixing portion 53 extending from the first fixing portion 53 to a position exceeding the second end surface 50b of the battery 50. The first extending portion 54 and the plate-like first connecting portion 55 folded back from the first extending portion 54 so as to face the first fixed portion 53 are provided.

  The second electrode terminal 56 includes a plate-like second fixing portion 57 fixed to the second end surface 50b, and a plate-like second extension extending from the second fixing portion 57 so as to be separated from the second end surface 50b. Part 58 and a plate-like second connection part 59 folded back from the second extending part 58 so as to face the second fixing part 57. The dimension of the second extending portion 58 in the extending direction is shorter than the dimension of the first extending portion 54 in the extending direction. The battery 50 is disposed in the case 21 with the first extending portion 54 inserted into the recess 37. The first connection part 55 and the second connection part 59 are in contact with the wiring pattern 45.

  As shown in FIG. 5, before the lid 40 is fixed, the first connection portion 55 and the second connection portion 59 protrude from the opening 31 of the case body 30 to the outside and have the same height. The dimensions of the first extending portion 54 and the second extending portion 58 are set.

  In the case 21, the first electrode terminal 52 and the second electrode terminal 56 are pressed toward the bottom portion 32 by the lid 40, and the first extending portion 54 and the second extending portion 58 are pressed. It is elastically deformed. The first connection part 55 and the second connection part 59 are pressed toward the wiring pattern 45 by the restoring force of the first extension part 54 and the second extension part 58. Accordingly, the first connection portion 55 and the second connection portion 59 are in close contact with the wiring pattern 45.

  The tire condition detection device 20 described above calculates and amplifies the output detected by the pressure sensor 43 by the IC chip 44 and detects the air pressure of the tire 14. Then, the detected air pressure of the tire 14 is transmitted from the transmitter 42 to a receiver provided on the vehicle body or the like. Similarly, the tire condition detection device 20 transmits the temperature in the tire 14 detected by the temperature sensor 41 from the transmitter 42 to the receiver. When an abnormality occurs in the state (air pressure and temperature) of the tire 14, the receiver notifies the driver to that effect.

Next, the operation of the tire condition detection device 20 of the present embodiment will be described.
As shown in FIG. 6, when reflow soldering an electronic component on the lid 40, a metal mask 61 is disposed on the lid 40 (wiring pattern 45), and cream solder 62 provided on the metal mask 61 is used for mounting. By moving the squeegee 63 which is an instrument of the above, it is poured into the hole 64 of the metal mask 61. Thereby, the cream solder 62 is applied to a designated position on the wiring pattern 45. Then, the electronic component is placed on the lid 40 by placing the electronic component by a mounting machine and melting and solidifying the cream solder 62 in a furnace.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) By mounting an electronic component on the lid 40, the lid 40 is also used as a substrate. The lid 40 has a flat plate shape, and no walls or the like are erected around it. For this reason, the movement of the instrument for mounting is not hindered. For example, when the cream solder 62 is applied, the movement of the squeegee 63 is not hindered. Moreover, an electronic component can be arrange | positioned using a general mounting machine. Therefore, it is possible to easily mount the electronic component as compared with the case where the electronic component is mounted on the bottom 32 of the case body 30.

  (2) The pressure sensor 43 and the IC chip 44 are embedded in the lid 40. For this reason, the pressure sensor 43 and the IC chip 44 can be provided within the thickness of the lid 40, and the tire state detection device 20 can be further downsized.

  (3) The first electrode terminal 52 and the second electrode terminal 56 are pressed toward the bottom 32 of the case body 30 by the lid 40, and the first extending portion 54 and the second extending portion 58 are elastically deformed. ing. The first connecting portion 55 and the second connecting portion 59 are pressed against the wiring pattern 45 by elastically deforming the first extending portion 54 and the second extending portion 58. Therefore, the first connection portion 55 and the second connection portion 59 can be brought into close contact with the wiring pattern 45 by the pressing force of the lid 40, and the first electrode terminal 52 and the second electrode terminal 56 are connected to the wiring pattern by soldering or the like. No need to connect to 45. Therefore, manufacture of the tire condition detection apparatus 20 becomes easy.

  (4) The case body 30 and the lid 40 can be positioned by inserting the protruding portion 38 of the case body 30 into the groove 48 of the lid 40. For this reason, when fixing the lid | cover 40 to the case main body 30, it is suppressed that the wiring pattern 45, the 1st connection part 55, and the 2nd connection part 59 are connected in the incorrect position. In particular, by providing the case body 30 with the protruding portion 38, the movement of the squeegee 63 is not hindered by the protruding portion 38.

  (5) Since the case body 30 and the lid 40 are laser-welded, the sealing property between the case body 30 and the lid 40 is ensured. For this reason, in order to suppress that an electronic component touches external air, it is not necessary to fill the case 21 with potting resin, and weight reduction of the tire condition detection apparatus 20 is achieved. In laser welding, since the heating range is narrow, the electronic component is hardly heated even when the case body 30 and the lid 40 are welded, and deterioration of the electronic component due to welding is suppressed.

  (6) The first side wall 33 of the case body 30 is provided with a concave portion 37, and the first extending portion 54 of the battery 50 is inserted into the concave portion 37. For this reason, when the battery 50 is accommodated in the case 21, the battery 50 can be positioned by arranging the battery 50 so that the first extending portion 54 is inserted into the recess 37. Therefore, it can suppress that the 1st electrode terminal 52 and the 2nd electrode terminal 56, and the wiring pattern 45 are connected in the incorrect position, or a contact failure arises.

In addition, you may change embodiment as follows.
-Although the temperature sensor 41 and the pressure sensor 43 were provided as a sensor which detects the state of the tire 14, you may provide another sensor.

All the electronic components may be embedded in the lid 40.
The electronic component may not be embedded in the lid 40.
The case body 30 may be provided with a groove 48, and the lid 40 may be provided with a protrusion 38. When the protrusions 38 are provided on the lid 40, the protrusions 38 are provided at positions that do not hinder the movement of the squeegee 63. In this case, positioning is performed by inserting the protruding portion 38 of the lid 40 into the groove 48 of the case body 30.

The protrusion 38 may not be provided on the case body 30, and the groove 48 may not be provided on the lid 40.
The case body 30 may have a bottomed cylindrical shape or a bottomed pentagonal cylindrical shape. That is, any shape may be used as long as the cylindrical side wall is erected from the bottom 32. Further, the shape of the lid 40 is changed to a disc shape, a pentagonal plate shape, or the like in accordance with the shape of the case body 30.

The mounting surface 40a of the lid 40 may have some undulations as long as the electronic component can be mounted.
The first connection part 55 and the second connection part 59 may be joined to the wiring pattern 45 by solder or the like. In this case, the first connecting portion 55 and the second connecting portion 59 may be pressed against the wiring pattern 45 by the restoring force of the first extending portion 54 and the second extending portion 58, or may not be pressed.

The tire condition detection device 20 may not be integrated with the tire valve 13 and may be provided separately from the tire valve 13.
The pressure sensor 43 and the IC chip 44 may be connected to the wiring pattern 45 by wire bonding.

The lid 40 may be fixed to the case body 30 with an adhesive.
-The recessed part 37 does not need to be formed.
The shape of the first electrode terminal 52 and the second electrode terminal 56 may be changed.

-The shape of the protrusion part 38 and the groove | channel 48 may be changed suitably.
-The lid | cover 40 should just be fixed to the case main body 30, and the sealing performance between the lid | cover 40 and the case main body 30 does not need to be ensured. In this case, it is preferable to fill the case 21 with potting resin.

  The electronic component may be mounted on the lid 40 by a method other than reflow soldering. Even in this case, since the movement of the mounting tool is not hindered, the electronic component can be easily mounted on the lid 40.

  DESCRIPTION OF SYMBOLS 14 ... Tire, 20 ... Tire condition detection apparatus, 21 ... Case, 30 ... Case main body, 31 ... Opening part, 38 ... Projection part, 40 ... Cover, 41 ... Temperature sensor, 42 ... Transmitter, 43 ... Pressure sensor, 44 ... IC chip, 45 ... wiring pattern, 48 ... groove, 50 ... battery, 52 ... first electrode terminal, 56 ... second electrode terminal.

Claims (5)

An electronic component including a sensor for detecting the condition of the tire;
A case in which an opening of a bottomed cylindrical case body is closed with a flat lid as a substrate and the electronic component is accommodated, and a tire state detection device comprising:
A tire condition detection device in which the electronic component is mounted on the lid.   The tire state detection device according to claim 1, wherein the electronic component is embedded in the lid. A battery having an electrode terminal extending toward the wiring pattern provided on the inner surface of the lid and electrically connected to the wiring pattern is provided in the case.
The tire state detection device according to claim 1, wherein the electrode terminal is pressed toward the bottom of the case by the lid.   4. The tire state detection device according to claim 1, wherein one of the case main body and the lid has a groove, and the other has a protrusion that is inserted into the groove. .   The tire state detection device according to any one of claims 1 to 4, wherein the lid is laser-welded to the case body.