JP6498646B2 - Tire pressure detection device - Google Patents

Description

  The present invention relates to a tire pressure detection device.

  When the tire pressure (internal pressure) decreases, there is a risk of causing a decrease in fuel consumption or uneven wear in which a part of the tire is worn unevenly. For this reason, a tire pressure detection device for detecting the pressure of the tire is provided in the tire.

  For example, as described in Patent Document 1, the tire pressure detection device includes a pressure sensor that detects the pressure of the tire and a case that houses the pressure sensor. The pressure sensor includes a pressure receiving unit and detects pressure acting on the pressure receiving unit. The case includes a pressure introduction port that allows communication between the inside and the outside of the case. The pressure receiving portion of the pressure sensor is exposed to the gas in the tire through the pressure inlet. In order to prevent foreign matters such as liquid from entering the case from the pressure inlet, the tire pressure detection device includes a seal member.

  The seal member is disposed between the wall portion provided with the pressure introduction port and the pressure sensor. For example, a case is provided with the case main body of the shape where the cylindrical surrounding wall stood from the wall part which has a pressure inlet, and the lid | cover which obstruct | occludes the opening part divided by the surrounding wall. Then, the pressure sensor is pressed against the wall portion by the lid, so that the seal member is crushed and the space between the pressure sensor and the wall portion is sealed.

JP 11-2111594 A

  By the way, regarding the manufacture of the tire pressure detection device, from the viewpoint of improving the productivity, it is preferable that each part such as the case and the pressure sensor be one kind. However, there are cases where a tire pressure detection device is manufactured using a plurality of pressure sensors of different sizes due to the use of pressure sensors from a plurality of manufacturers or a change in product shape. When the direction in which the wall portion where the pressure inlet is provided and the lid face each other is the height direction, the pressure sensor cannot be pressed against the wall portion via the seal member depending on the height direction dimension of the pressure sensor. Things can happen.

  In addition, even when the same type of pressure sensor is used, if the pressure sensor is pressed against the wall via a component that is arranged in the height direction and overlapping the pressure sensor, the component that overlaps the pressure sensor The same situation may occur depending on the height dimension of the.

  The objective of this invention is providing the tire pressure detection apparatus which can press a pressure sensor on the wall part in which the pressure inlet was provided through the sealing member which has elastic force.

  A tire pressure detecting device that solves the above problems includes a case main body in which a cylindrical peripheral wall is erected from a wall portion having a pressure introduction port, a case having a lid that closes an opening of the case main body, and the pressure introduction Arranged between the pressure sensor housed in the case so that the pressure receiving part is exposed to gas outside the case through the mouth, the periphery of the pressure introduction port in the wall, and the pressure sensor, A seal member having an elastic force that seals between the periphery of the pressure introduction port in the wall and the pressure sensor, and a tire pressure detection device that is disposed in the tire and detects the pressure of the tire, Assuming that the direction in which the wall portion and the lid face each other is a height direction, the pressure sensor includes a first pressure sensor or a second pressure sensor having a height dimension shorter than that of the first pressure sensor. The case includes a first pressing portion capable of pressing the first pressure sensor against the wall portion via the seal member, and a second pressure capable of pressing the second pressure sensor against the wall portion via the seal member. A tire including a second pressing portion on the lid.

  According to this, when the first pressure sensor is used as the pressure sensor, the first pressure sensor is pressed against the wall portion by the first pressing portion via the seal member. At this time, the lid is attached to the case body in such a manner that the first pressure sensor is not pressed by the second pressing portion, and the opening is closed. When the second pressure sensor is used as the pressure sensor, the attachment mode of the lid is changed from when the first pressure sensor is pressed, and the second pressure sensor is attached to the wall portion via the seal member by the second pressing portion. The opening is closed with a lid so as to be pressed. Therefore, even when a plurality of types of pressure sensors having different height dimensions are used as the pressure sensor, the pressure sensor is pressed against the wall portion through the seal member by changing the attachment mode of the lid. Can do. It is not necessary to prepare a separate case for each pressure sensor having a different dimension in the height direction, and the number of parts can be reduced, and thus the manufacturing cost of the tire pressure detection device can be reduced.

  A tire pressure detecting device that solves the above problems includes a case main body in which a cylindrical peripheral wall is erected from a wall portion having a pressure introduction port, a case having a lid that closes an opening of the case main body, and the pressure introduction Arranged between the pressure sensor housed in the case so that the pressure receiving part is exposed to gas outside the case through the mouth, the periphery of the pressure introduction port in the wall, and the pressure sensor, When the sealing member having an elastic force for sealing between the pressure inlet and the pressure sensor in the wall portion and the direction in which the wall portion and the lid face each other are defined as a height direction, the pressure in the height direction is determined. A superposition part that is a part that overlaps the sensor, and a tire pressure detection device that is disposed in the tire and detects the pressure of the tire, wherein the superposition part is a first superposition part, or A first pressing portion that includes a second overlapping component that is shorter in height than the one overlapping component, and wherein the case can press the pressure sensor against the wall via the first overlapping component and the seal member And a second pressing part capable of pressing the pressure sensor against the wall part via the second overlapping part and the seal member, and the second pressing part is provided on the lid.

  According to this, when a 1st superposition | polymerization component is used as a superposition | polymerization component, a 1st pressure sensor is pressed on a wall part via a 1st superposition | polymerization part and a sealing member by a 1st press part. At this time, the lid is attached to the case body in such a manner that the first pressure sensor is not pressed by the second pressing portion via the first overlapping component, and the opening is closed. When the second superposed part is used as the superposed part, the mounting manner of the lid is changed from that when the first superposed part is pressed, and the second superposed part is passed through the second superposed part via the seal member by the second pressing portion. Two pressure sensors are pressed against the wall. Therefore, even if multiple types of overlapping parts with different dimensions in the height direction are used as the overlapping parts, the pressure sensor is pressed against the wall portion through the seal member by changing the attachment mode of the lid. Can do. There is no need to prepare a separate case for each of the superposed parts having different dimensions in the height direction, so that the number of parts can be reduced, and the manufacturing cost of the tire pressure detecting device can be reduced.

  In the tire pressure detection device, the first pressing portion is provided on the lid, and the lid is a first surface that can be an inner surface of the case, and an inner surface of the case and is an opposite surface of the first surface. A second surface is provided, the first pressing portion is provided on the first surface, and the second pressing portion is provided on the second surface.

According to this, by inverting the lid, it is possible to easily switch between pressing the pressure sensor with the first pressing portion and pressing the pressure sensor with the second pressing portion.
About the said tire pressure detection apparatus, the said lid | cover may be provided with the identification part for identifying the said 1st surface and the said 2nd surface.

According to this, it is easy to identify the first surface and the second surface.
The tire pressure detection device includes an antenna for transmitting pressure information detected by the pressure sensor to a receiver, and a substrate to which the antenna is joined, and the antenna includes the substrate and the wall portion. The elastic deformation part which can change the dimension of the said height direction is provided in the site | part located in between.

  According to this, the dimension of the height direction of an antenna can be changed because an elastic deformation part deform | transforms according to the space | interval of a board | substrate and a wall part.

  According to the present invention, the pressure sensor can be pressed against the wall portion provided with the pressure inlet through the sealing member having elastic force.

The perspective view of the tire valve unit with which the wheel was equipped. Sectional drawing which shows the transmitter of 1st Embodiment in the case of using a 1st pressure sensor as a pressure sensor. The perspective view which shows the cover of 1st Embodiment. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 2 illustrating the transmitter according to the first embodiment. (A) is sectional drawing which shows the antenna before accommodating in a case, (b) is sectional drawing which shows the antenna in case the 1st pressure sensor is used as a pressure sensor, (c) is a 2nd pressure sensor as a pressure sensor. Sectional drawing which shows the antenna in the case of using. Sectional drawing which shows the transmitter of 1st Embodiment in the case of using a 2nd pressure sensor as a pressure sensor. Sectional drawing which shows the transmitter of 2nd Embodiment in the case of using a 1st battery as a battery. Sectional drawing which shows the transmitter of 2nd Embodiment in the case of using a 2nd battery as a battery. (A) And (b) is sectional drawing which shows the modification of a transmitter. (A) And (b) is sectional drawing which shows the transmitter of a modification. (A), (b) and (c) are top views which show the modification of a press part. Sectional drawing which shows the modification of an antenna.

(First embodiment)
Hereinafter, a first embodiment of the tire pressure detection device will be described.
As shown in FIG. 1, the tire valve unit 10 includes a tire valve 13 attached to a rim 12 of a wheel 11 and a transmitter 20 as a tire pressure detection device attached to the tire valve 13. In a state where the tire valve 13 is mounted on the rim 12, the transmitter 20 is disposed in the tire 14 mounted on the wheel 11. Although illustration is omitted, the tire valve 13 and the transmitter 20 include a fixing portion that is fixed to each other.

  As shown in FIGS. 2 and 6, the transmitter 20 includes a case 21. The transmitter 20 includes a sensor seal 41, a pressure sensor 42, a substrate (substrate 51 or substrate 81), an antenna 61, a first battery terminal 52, a second battery terminal 53, and a battery 71 in the case 21. The transmitter 20 detects the pressure (internal pressure) of the tire 14 and transmits pressure information (for example, information on the pressure value, information on pressure abnormality, etc.) that is information on the pressure of the tire 14 to the receiver. The receiver is mounted on a vehicle, for example. Moreover, the portable terminal which a vehicle user possesses can also be used as a receiver. When the receiver receives the information from the transmitter 20, the receiver displays the pressure value on the display unit, or if a pressure abnormality occurs, notifies the fact. As a result, the transmitter 20 and the receiver constitute a tire pressure monitoring system = TPMS (registered trademark).

  In the transmitter 20 of the present embodiment, the first pressure sensor 42A shown in FIG. 2 or the second pressure sensor 42B shown in FIG. 6, which is different from the first pressure sensor 42A, is used as the pressure sensor 42 described above. . The same case 21 is used when the first pressure sensor 42A is used and when the second pressure sensor 42B is used, but the mounting manner of the pressure sensor 42 is different. First, a mounting mode when the first pressure sensor 42A is used as the pressure sensor 42 will be described.

The case 21 includes a bottomed cylindrical case body 22 and a lid 27 that closes the opening 26 of the case body 22. The case main body 22 and the lid 27 are made of resin, for example.
The case body 22 includes a flat wall portion 23 and a cylindrical peripheral wall 24 erected from the wall portion 23. For example, when the wall portion 23 has a polygonal plate shape such as a square plate shape, the peripheral wall 24 has a polygonal tube shape such as a square tube shape. For example, when the wall portion 23 is disk-shaped, the peripheral wall 24 is cylindrical.

  The wall portion 23 includes a pressure inlet 25 penetrating in the thickness direction. The wall portion 23 includes a cylindrical protrusion 23 a that protrudes into the peripheral wall 24 from a position surrounding the pressure inlet 25. The protrusion 23 a has a recess 23 b that is recessed from the tip surface in the plate pressure direction of the wall 23. The recess 23 b surrounds the pressure introduction port 25. The pressure inlet 25 is open to the recess 23b. In the thickness direction of the wall 23, the peripheral wall 24 includes an opening 26 at the end opposite to the wall 23. The opening 26 is partitioned by being surrounded by the peripheral wall 24.

  As shown in FIGS. 2 and 3, the lid 27 includes a plate-shaped main body 28, a first pressing portion 35, and a second pressing portion 36. The main body 28 has a shape matched to the peripheral wall 24. If the peripheral wall 24 is a polygonal cylinder, the main body 28 has a polygonal plate shape. If the peripheral wall 24 is a cylindrical shape, the main body 28 has a disk shape. The main body 28 includes a first surface 29 and a second surface 30. In the present embodiment, the first surface 29 and the second surface 30 are both surfaces of the main body 28 in the plate thickness direction, and the opposite surface of the first surface 29 is the second surface 30. The main body 28 includes an identification unit 31 in which the center of the main body 28 is recessed in a truncated cone shape from the first surface 29 toward the second surface 30. The main body 28 includes an annular peripheral edge 32 at a portion surrounding the identification part 31. It can be said that the identification unit 31 has a shape in which the center of the main body 28 protrudes from the first surface 29 toward the second surface 30.

  The identification unit 31 includes a bottom 33 and an inclined portion 34 that connects the edge of the peripheral edge 32 and the edge of the bottom 33. The lid 27 includes a first pressing portion 35 on the first surface 29 and a second pressing portion 36 on the second surface 30. Each pressing part 35, 36 is provided in the identification part 31. In the present embodiment, the pressing portions 35 and 36 are provided on the inclined portion 34 of the identification portion 31, but may be provided on the bottom portion 33. The first pressing portion 35 is a cylindrical protruding portion that protrudes from the first surface 29 in the plate thickness direction of the main body 28. The second pressing portion 36 is a cylindrical protruding portion that protrudes from the second surface 30 in the plate thickness direction of the main body 28. Each pressing part 35, 36 includes a notch 37 that communicates the inside and outside of the pressing part 35, 36. The protruding length L1 of the first pressing portion 35 from the first surface 29 of the peripheral portion 32 in the plate thickness direction of the main body 28 is the second pressing portion 36 from the second surface 30 of the peripheral portion 32 in the plate thickness direction of the main body 28. Is shorter than the protruding length L2.

  A peripheral edge 32 of the lid 27 is welded to the peripheral wall 24. When the first pressure sensor 42 </ b> A is used as the pressure sensor 42, the lid 27 is welded so that the first surface 29 faces the case body 22 side. The first surface 29 becomes the inner surface of the case 21, and the first pressing portion 35 protrudes into the case 21. The second surface 30 becomes the outer surface of the case 21, and the second pressing portion 36 protrudes outside the case 21.

Next, components housed in the case 21 will be described. In the following description, the direction in which the wall 23 and the lid 27 face each other is defined as a height direction.
As shown in FIG. 2, the sensor seal 41 is an annular seal member. The sensor seal 41 is made of a material having an elastic force such as rubber, for example. The sensor seal 41 is provided in the recess 23b so as to cover the periphery of the pressure inlet 25. The inner side of the sensor seal 41 communicates with the pressure inlet 25.

  The first pressure sensor 42 </ b> A includes a pressure receiving unit 43. 42 A of 1st pressure sensors detect the pressure of the space where the pressure receiving part 43 is exposed by converting the magnitude | size (distortion of the pressure receiving part 43) of the pressure which acts on the pressure receiving part 43 into an electrical signal. 42 A of 1st pressure sensors are arrange | positioned so that the pressure receiving part 43, the inner side of the sensor seal | sticker 41, and the pressure inlet 25 may communicate. Thereby, the pressure receiving part 43 is exposed to the gas in the tire 14 that is a gas outside the case 21 through the pressure inlet 25.

  The sensor seal 41 seals between the first pressure sensor 42 </ b> A and the wall portion 23 by being sandwiched between the first pressure sensor 42 </ b> A and the wall portion 23. This prevents foreign substances such as water from entering the case 21 through the pressure inlet 25.

  The substrate 51 includes a wiring pattern (not shown) for connecting electronic components including the first pressure sensor 42 </ b> A, the battery terminals 52 and 53, and the antenna 61. The electronic component described above includes a transmission circuit that modulates data indicating pressure information detected by the first pressure sensor 42A and generates a data signal in a predetermined frequency band, and a transmitter for controlling the transmitter 20 A control unit is included. The data signal generated by the transmission circuit is transmitted to the receiver via the antenna 61.

  As shown in FIG. 4, the antenna 61 is made of a leaf spring, and is a loop antenna manufactured by bending one rectangular metal plate. The antenna 61 is made of, for example, stainless steel. The antenna 61 includes a base portion 62, an extension portion 63 projecting in the same direction from both ends of the base portion 62, and an extension portion of each extension portion 63 extending from an end portion opposite to the base portion 62. And a terminal 64 protruding in a direction approaching the portion 63. The terminal 64 is bonded to the substrate 51.

  As shown in FIG. 5A, the base portion 62 of the antenna 61 before being housed in the case 21 has an arc shape that is convex in a direction away from the substrate 51. Each extending portion 63 of the antenna 61 before being accommodated in the case 21 has an arc shape that is convex in a direction away from each other.

  As shown in FIGS. 4 and 5B, the base portion 62 of the antenna 61 is in contact with the wall portion 23 while being accommodated in the case 21. The antenna 61 is sandwiched between the substrate 51 and the wall portion 23. A force directed from the wall 23 toward the substrate 51 acts on the base 62 of the antenna 61. A force from the substrate 51 toward the wall portion 23 acts on the terminal 64 of the antenna 61. Due to these forces, the base portion 62 of the antenna 61 is elastically deformed so as to be linear along the inner surface of the wall portion 23. Each extending portion 63 of the antenna 61 is elastically deformed so that the protruding amount in the direction away from each other is larger than that before being accommodated in the case 21. Due to the elastic deformation of the base portion 62 and each extending portion 63, the dimension h10 in the height direction of the antenna 61 becomes shorter than before being accommodated in the case 21. That is, the base portion 62 and each extending portion 63 function as an elastic deformation portion located between the wall portion 23 and the substrate 51, so that the dimension h <b> 10 of the antenna 61 in the height direction is the substrate 51 and the wall portion 23. It is the size according to the interval. The height dimension h10 of the antenna 61 refers to the longest dimension among the height dimensions from the terminal 64 to the base 62.

  As shown in FIG. 2, the battery 71 includes a disk-shaped exterior 72 and a power generation element 73 accommodated in the exterior 72. The exterior 72 includes projecting portions 75 having a shape projecting on both sides in the axial direction. The exterior 72 includes a peripheral edge 74 that surrounds the protrusion 75. One protrusion 75 functions as a positive terminal of the battery 71, and the other protrusion 75 functions as a negative terminal. The battery 71 is disposed so that the axial direction of the exterior 72 and the height direction coincide with each other. One protrusion 75 protrudes toward the substrate 51, and the other protrusion 75 protrudes toward the lid 27. The battery 71 is disposed at a position overlapping the substrate 51 with a slight gap. The tip of the first pressing portion 35 is in contact with the surface near the lid 27 of the peripheral edge portion 74 of the battery 71.

  One end of the first battery terminal 52 is in contact with the protruding portion 75 located closer to the substrate 51 among the protruding portions 75. One end of the first battery terminal 52 is joined to the protrusion 75 by welding or the like. The other end of the first battery terminal 52 is in contact with the wiring pattern of the substrate 51. One end of the second battery terminal 53 is in contact with the protruding portion 75 located near the lid 27 among the protruding portions 75. One end of the second battery terminal 53 is joined to the protrusion 75 by welding or the like. The other end of the second battery terminal 53 is in contact with the wiring pattern of the substrate 51. The second battery terminal 53 enters the region surrounded by the protruding portion 75 of the battery 71 and the first pressing portion 35 via the notch 37.

The first battery terminal 52, the second battery terminal 53, and the battery 71 are superposed parts that overlap the first pressure sensor 42A in the height direction.
The peripheral portion 74 of the battery 71 is pushed into the case 21 toward the wall portion 23 by the first pressing portion 35 of the lid 27. The force applied from the first pressing portion 35 is applied to the first pressure sensor 42 </ b> A via the battery 71, the first battery terminal 52, the second battery terminal 53, and the substrate 51. The first pressure sensor 42 </ b> A is pressed against the wall portion 23 via the sensor seal 41. The sensor seal 41 is crushed in the height direction under the force from the first pressure sensor 42A.

  Assuming that the first pressure sensor 42A and the overlapped part that overlaps the first pressure sensor 42A are the first unit U1, the first pressing portion 35 can be regarded as pressing the first unit U1 against the wall portion 23. A dimension L3 from a portion of the first pressing portion 35 that contacts the first unit U1 to a portion of the wall portion 23 that contacts the first unit U1 (in this embodiment, the bottom of the recess 23b) is accommodated in the case 21. It is slightly shorter than the dimension in the height direction of the first unit U1 before being performed. The dimension in the height direction of the first pressing portion 35 (the protruding length from the first surface 29) can be held in a state where the first pressure sensor 42A is pressed against the wall portion 23, and the wall portion 23 and the first pressure sensor It is set to a dimension that can secure the amount of collapse of the sensor seal 41 that can seal the gap with 42A.

  Next, an attachment aspect when the second pressure sensor 42B is used as the pressure sensor 42 will be described. When the second pressure sensor 42B is used as the pressure sensor 42, the case body 22, the lid 27, the battery 71, and the sensor seal 41 are the same as those used when the first pressure sensor 42A is used. As the substrate 81, a substrate different from the case where the first pressure sensor 42A is used is used. The outer shape of the substrate 81 is the same as that of the substrate 51 when the first pressure sensor 42A is used as the pressure sensor 42, but the dimension of the wiring pattern of the substrate 81 corresponds to the second pressure sensor 42B. .

  As shown in FIGS. 2 and 6, the height dimension h2 of the second pressure sensor 42B is shorter than the height dimension h1 of the first pressure sensor 42A. Similar to the first pressure sensor 42A, the second pressure sensor 42B includes a pressure receiving unit 44. If the lid 27 is welded to the case main body 22 with the first pressing portion 35 protruding into the case 21, the sensor seal 41 and the wall portion 23 are in a state where the first unit U 1 is supported by the first pressing portion 35. The second pressure sensor 42 </ b> B cannot be pressed against the wall portion 23. Even if the second pressure sensor 42B can be pressed against the wall 23, the amount of collapse of the sensor seal 41 is insufficient, and the airtightness between the second pressure sensor 42B and the wall 23 may be insufficient. If the case 21 corresponding to the first pressure sensor 42A and the case 21 corresponding to the second pressure sensor 42B are separately prepared, it is necessary to prepare a plurality of types of cases 21.

  In the present embodiment, the second pressure sensor 42 </ b> B can be pressed against the wall portion 23 by the second pressing portion 36 provided on the second surface 30 of the lid 27. 42 can be held.

  As shown in FIG. 6, when the second pressure sensor 42 </ b> B is used as the pressure sensor 42, the lid 27 is welded to the peripheral wall 24 of the case body 22 so that the second surface 30 of the lid 27 faces the case body 22. Yes. In this case, the second surface 30 of the lid 27 becomes a part of the inner surface of the case 21. Therefore, the first surface 29 and the second surface 30 of the lid 27 can be the inner surface of the case 21.

  The tip of the second pressing portion 36 is in contact with the surface near the lid 27 of the peripheral edge portion 74 of the battery 71. The second battery terminal 53 enters the region surrounded by the protruding portion 75 of the battery 71 and the second pressing portion 36 via the notch 37.

  When the first surface 29 faces the case body 22, the identification unit 31 is recessed so as to be away from the wall 23. On the other hand, when the second surface 30 faces the case body 22, the identification part 31 protrudes toward the wall part 23. For this reason, if the 1st press part 35 is provided in the 1st surface 29 in the identification part 31, and the 2nd press part 36 is provided in the 2nd surface 30 in the identification part 31, the dimension of the height direction of the press parts 35 and 36 mutually. Are the same, or when the dimension of the first pressing part 35 in the height direction is slightly longer than the dimension of the second pressing part 36 in the height direction, the distance between the tip of the first pressing part 35 and the wall part 23 The dimension in the height direction between the tip of the second pressing part 36 and the wall part 23 is shorter than the dimension in the height direction. Thereby, the difference between the height direction dimension of the first pressure sensor 42 </ b> A and the height direction dimension of the second pressure sensor 42 </ b> B can be compensated by the second pressing portion 36 and the identification portion 31.

  The peripheral edge portion 74 of the battery 71 is pushed into the case 21 toward the wall portion 23 by the second pressing portion 36 of the lid 27. The force applied from the second pressing portion 36 is applied to the second pressure sensor 42 </ b> B via the battery 71, the first battery terminal 52, the second battery terminal 53, and the substrate 51. The second pressure sensor 42 </ b> B is pressed against the wall portion 23 via the sensor seal 41. The sensor seal 41 is crushed in the height direction under the force from the second pressure sensor 42B.

  Assuming that the second pressure sensor 42B and the overlapped part arranged overlapping the second pressure sensor 42B are the second unit U2, the dimension in the height direction of the second unit U2 is the height direction of the first unit U1. Shorter than dimensions. The second pressing part 36 can also be understood as pressing the second unit U2 against the wall part 23. A dimension L4 from a portion of the second pressing portion 36 that contacts the second unit U2 to a portion of the wall portion 23 that contacts the second unit U2 (the bottom of the recess 23b in this embodiment) is accommodated in the case 21. It is slightly shorter than the dimension in the height direction of the second unit U2 before being performed. The dimension in the height direction of the second pressing portion 36 (projection length from the second surface 30) can be held in a state where the second pressure sensor 42B is pressed against the wall portion 23, and the wall portion 23 and the first pressure sensor. It is set to a dimension that can secure the amount of collapse of the sensor seal 41 that can seal the gap with 42A.

  In this embodiment, the dimension of the height direction of the 1st press part 35 and the dimension of the 2nd press part 36 are set so that the dimension L3 and the dimension L4 may correspond. Thereby, even when the 1st pressure sensor 42A is used as the pressure sensor 42, even when the 2nd pressure sensor 42B is used, the crushing amount of the sensor seal 41 becomes constant.

  As shown in FIGS. 5C and 6, when the second pressure sensor 42 </ b> B is used as the pressure sensor 42, the distance between the substrate 81 and the wall portion 23 is shorter than when the first pressure sensor 42 </ b> A is used. . When the distance between the substrate 81 and the wall portion 23 is shortened, the force applied to the base portion 62 of the antenna 61 and the terminal 64 of the antenna 61 is increased.

  As shown in FIG. 5C, when the second pressure sensor 42B is used as the pressure sensor 42, the amount of elastic deformation of each extending portion 63 of the antenna 61 is larger than when the first pressure sensor 42A is used. (The amount of protrusion of each extending portion 63 in the direction away from each other is greater than when the first pressure sensor 42A is used). Then, as compared with the case where the first pressure sensor 42A is used, the height dimension of each extending portion 63 is shortened, and the height dimension h10 of the antenna 61 is shortened accordingly.

Next, the operation of the transmitter 20 will be described.
The lid 27 includes a first pressing part 35 and a second pressing part 36. Which of the first surface 29 and the second surface 30 of the lid 27 is used as the inner surface of the case 21, the pressure sensor 42 is pressed against the wall portion 23 by the first pressing portion 35 via the sensor seal 41, or It is possible to select whether to press the wall portion 23 with the two pressing portions 36.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) When the first pressure sensor 42 </ b> A is used as the pressure sensor 42, the first pressure sensor 42 </ b> A can be pressed against the wall portion 23 via the sensor seal 41 by the first pressing portion 35. When the second pressure sensor 42 </ b> B is used as the pressure sensor 42, the second pressure sensor 42 </ b> B can be pressed against the wall portion 23 via the sensor seal 41 by the second pressing portion 36. Even if it is the single case 21 by providing the 1st press part 35 and the 2nd press part 36 in the lid | cover 27, and changing the attachment aspect of the lid | cover 27 according to the kind of the pressure sensor 42, it is a pressure sensor. The pressure sensor 42 can be pressed against the wall 23 while maintaining the sealing performance between the wall 42 and the wall 23. Therefore, compared with the case where different cases are used for the plurality of types of pressure sensors 42, the number of parts can be reduced, and thus the manufacturing cost of the transmitter 20 can be reduced.

  In addition, by providing the second pressing portion 36 on the lid 27, when the first pressure sensor 42 </ b> A is used as the pressure sensor 42, the second pressing portion 36 can be directed to the outside of the case 21. Thereby, the 2nd press part 36 does not interfere with 42 A of 1st pressure sensors, etc.

  (2) The lid 27 includes a first pressing portion 35 on the first surface 29 and a second pressing portion 36 on the second surface 30. By simply inverting the lid 27, it is possible to easily switch between pressing the pressure sensor 42 with the first pressing portion 35 and pressing the pressure sensor 42 with the second pressing portion 36.

  (3) The lid 27 includes an identification unit 31 that is recessed from the first surface 29 toward the second surface 30. When the lid 27 is inverted, the direction in which the identification unit 31 is recessed changes, so that the first surface 29 and the second surface 30 can be identified. Therefore, even after the lid 27 is welded to the case body 22, it can be identified which of the first surface 29 and the second surface 30 faces the case body 22. Furthermore, as the pressure sensor 42, it can be grasped whether the first pressure sensor 42A or the second pressure sensor 42B is used.

  For example, when the main body 28 is formed in a flat plate shape without the identification unit 31, in order to press a plurality of types of pressure sensors 42 against the wall 23, the height of the first pressing unit 35 and the second pressing unit 36 are measured. Different dimensions in the height direction. In this case, before the lid 27 is welded, it is necessary to identify the first surface 29 and the second surface 30 from the dimensional difference between the first pressing portion 35 and the second pressing portion 36 in the height direction. However, the dimensional difference between the first pressing part 35 and the second pressing part 36 based on the dimensional difference between the first pressure sensor 42A and the second pressure sensor 42B is slight. For this reason, it is difficult to distinguish the first surface 29 and the second surface 30 from the dimensional difference between the first pressing portion 35 and the second pressing portion 36 in the height direction. On the other hand, by providing the identification unit 31, the first surface 29 and the second surface 30 can be easily identified before the lid 27 is welded.

  (4) As for the antenna 61, the dimension h10 in the height direction changes depending on the amount of elastic deformation of each extending portion 63 and the base portion 62. The space (height dimension h10) between the substrates 51 and 81 and the wall 23 varies depending on whether the first pressure sensor 42A or the second pressure sensor 42B is used as the pressure sensor 42. By changing the height h10 of the antenna 61 in accordance with this change, the common antenna 61 can be used when the first pressure sensor 42A is used and when the second pressure sensor 42B is used. For this reason, compared with the case where different types of antennas 61 are used for each of the plurality of types of pressure sensors 42, the number of parts can be reduced, and thus the manufacturing cost of the transmitter 20 can be reduced.

  An antenna whose height dimension does not change depending on the distance between the substrates 51 and 81 and the wall portion 23 can also be used. In this case, when the first pressure sensor 42A and the second pressure sensor 42B are used and a common antenna is used, the substrate 81 and the wall 23 when the second pressure sensor 42B is used are used. It is necessary to use an antenna whose dimension in the height direction is shorter than the distance. That is, among the pressure sensors 42 that can be accommodated in the case 21, it is necessary to set the height dimension of the antenna in accordance with the pressure sensor 42 having the shortest height dimension.

  In this case, a gap is generated between the base portion of the antenna and the wall portion 23. That is, the dimension in the height direction of the antenna cannot be increased to the limit in contact with the wall portion 23. In particular, when the first pressure sensor 42 </ b> A is used, the distance between the substrate 51 and the wall portion 23 is increased, and the gap between the base portion of the antenna and the wall portion 23 is increased. For the purpose of increasing the transmission output of the transmitter 20 or the like, it is desirable to secure the height of the antenna 61 from the substrate 51 as much as possible, and the above gap becomes a dead space.

  Each extending portion 63 and base portion 62 can be elastically deformed so that the dimension in the height direction of the antenna 61 changes in accordance with the distance between the substrates 51 and 81 and the wall portion 23, whereby the first pressure sensor 42A. Even when the second pressure sensor 42B is used, the height of the antenna 61 can be increased to the limit.

(Second Embodiment)
Next, a second embodiment of the tire pressure detection device will be described. In addition, in the following description, about the structure similar to the tire pressure detection apparatus of 1st Embodiment, the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  As shown in FIGS. 7 and 8, in the present embodiment, one type of pressure sensor 42 is used as the pressure sensor 42. In the present embodiment, it is assumed that the first pressure sensor 42A in the first embodiment is used as an example. On the other hand, as the battery 71 which is one of the overlapping parts, the first battery 71A as the first overlapping part or the second battery 71B as the second overlapping part of a different type from the first battery 71A is used. It is done. The dimension h22 in the height direction of the second battery 71B is shorter than the dimension h21 in the height direction of the first battery 71A. In the first embodiment, there is a difference in the height dimension of the unit due to the height dimension difference of the pressure sensor 42, whereas in the present embodiment, the height dimension of the battery 71 in the present embodiment. Due to the difference, a difference occurs in the height dimension of the unit. First, an attachment aspect in the case where the first battery 71A is used as the battery 71 will be described. The superposed part including the pressure sensor 42 and the first battery 71A is referred to as a third unit U3.

  As shown in FIG. 7, the lid 91 includes an identification portion 95 having a shape in which the main body 92 is recessed from the first surface 93 toward the second surface 94. Similar to the identification unit 31, the identification unit 95 includes a bottom portion 96 and an inclined portion 97. The identification portion 95 includes a terminal recess 98 that is recessed from the first surface 93 toward the second surface 94 in a part of the inclined portion 97.

  The lid 91 presses one protrusion 75 with the first surface 93 of the inclined portion 97 and pushes it into the case 21. That is, the first surface 93 of the inclined portion 97 functions as a first pressing portion. The pressure sensor 42 is pressed against the wall portion 23 via the superposed part including the first battery 71 </ b> A and the sensor seal 41. The dimension L11 in the height direction from the portion of the inclined portion 97 that contacts the third unit U3 to the portion of the wall portion 23 that contacts the third unit U3 (the bottom of the recess 23b in the present embodiment) is the case 21 is slightly shorter than the dimension in the height direction of the third unit U3 before being accommodated in the unit 21. The second battery terminal 53 enters a region surrounded by the bottom portion 96 and the protruding portion 75 via the terminal recess 98.

  Next, an attachment aspect when the second battery 71B is used as the battery 71 will be described. In addition, let the superposition | polymerization components containing the pressure sensor 42 and the 2nd battery 71B be the 4th unit U4.

  As shown in FIG. 8, when the second battery 71 </ b> B is used as the battery 71, the second surface 94 of the lid 91 is welded to the case body 22 so as to face the case body 22. The second battery 71 </ b> B is in contact with the second surface 94 of the bottom 96. The lid 91 pushes one protrusion 75 into the case 21 on the second surface 94 of the bottom 96. Accordingly, the second surface 94 functions as a second pressing portion. The pressure sensor 42 is pressed against the wall portion 23 via the overlapped part including the second battery 71 </ b> B and the sensor seal 41. The dimension L12 in the height direction from the portion of the second surface 94 that contacts the protruding portion 75 to the portion of the wall portion 23 that contacts the fourth unit U4 (in this embodiment, the bottom of the recess 23b) is It is slightly shorter than the dimension in the height direction of the fourth unit U4 before housing.

  The area of the second surface 94 of the bottom portion 96 is smaller than the area of the end surface of the protruding portion 75 in the axial direction. For this reason, when the bottom portion 96 presses the protruding portion 75, a position where the second battery terminal 53 is in contact with the outer peripheral side of the protruding portion 75 with respect to the portion where the bottom portion 96 contacts is secured. Different types of second battery terminals 53 are used when the first battery 71A is used and when the second battery 71B is used.

Therefore, according to the above embodiment, in addition to the effects (2), (3), and (4) of the first embodiment, the following effects can be obtained.
(5) The pressure sensor 42 can be pressed toward the wall portion 23 via the first battery 71A by the second surface 94 of the inclined portion 97 of the lid 91, and the second battery 71B can be pushed by the bottom portion 96 of the lid 91. Thus, the pressure sensor 42 can be pressed against the wall portion 23. For this reason, even if it is the single case 21 by selecting the press part according to the kind of battery 71, several types of batteries 71 are maintained, maintaining the sealing performance between the pressure sensor 42 and the wall part 23. FIG. The pressure sensor 42 can be pressed toward the wall portion 23 via the. Therefore, compared with the case where different types of cases 21 are used for each of the plurality of types of batteries 71, the number of parts can be reduced, and thus the manufacturing cost of the transmitter 20 can be reduced.

In addition, you may change embodiment as follows.
-In 1st Embodiment, the case main body 22 may be provided with the 1st press part. For example, as shown in FIG. 9A, the first pressing portion 101 has a pair of arm portions 102 that extend from the wall portion 23 of the case main body 22 toward the opening portion 26 and a direction in which the arm portions 102 approach each other. And a support portion 103 extending in the direction. In this case, the lid 27 includes a plate-like main body 28 and one cylindrical second pressing portion 110 that protrudes in the plate thickness direction of the main body 28. When the first pressure sensor 42 </ b> A is pressed against the wall portion 23 by the first pressing portion 101, the first pressure sensor 42 </ b> A is pushed into the case 21 toward the wall portion 23 via the battery 71 by the support portion 103. The dimension L21 in the height direction from the portion of the support portion 103 in contact with the first unit U1 to the portion of the wall portion 23 in contact with the first unit U1 is the height of the first unit U1 before being accommodated in the case 21. Slightly shorter than the vertical direction. In this case, the lid 27 is welded to the case body 22 so that the second pressing portion 110 faces the outside of the case 21.

  9B, when the second pressure sensor 42B is pressed against the wall 23 by the second pressing portion 110, the lid 27 is placed on the case main body 22 so that the second pressing portion 110 protrudes into the case 21. Welded. The second pressing part 110 enters between the pair of support parts 103 and extends to the wall part 23 side than the support part 103. Thereby, the second pressing part 110 presses the second pressure sensor 42 </ b> B against the wall part 23 via the battery 71. The dimension L22 in the height direction from the portion of the second pressing portion 110 that contacts the second unit U2 to the portion of the wall that contacts the second unit U2 is that of the second unit U2 before being accommodated in the case 21. Slightly shorter than the height direction. As shown in FIGS. 10A and 10B, the first pressing portion 120 may be a pair of protrusions extending from the peripheral wall 24 in a direction orthogonal to the height direction.

  Note that the case 21 shown in FIGS. 9 and 10 can be used even when one type of pressure sensor 42 is pressed against the wall portion 23 via a plurality of types of batteries 71 (overlapping parts).

  -In each embodiment, as shown to Fig.11 (a), each press part 35 and 36 does not need to be provided with the notch 37. FIG. Moreover, as shown in FIG.11 (b), each press part may be what a plurality of plate-shaped protrusions 130 protrude. As shown in FIG. 11 (c), each pressing portion may be one in which a plurality of columnar protruding pieces 140 protrude. As shown in FIG. 11A, when the area of the pressing portion in contact with the battery 71 is increased, the stress concentration of the battery 71 and the pressing portion is small, and the pressure sensor 42 is stably placed over the wall for a long period of time. 23 can be pressed. Moreover, as shown in FIG.11 (b) and FIG.11 (c), reducing the area of the press part which contacts the battery 71 can contribute to weight reduction of the transmitter 20. FIG. The shape of each pressing part may be determined in consideration of these balances.

  -In each embodiment, although the superposition | polymerization components were piled up in the height direction of the pressure sensor 42 and the pressure sensor 42 was hold | maintained via the superposition | polymerization components, it is not restricted to this. Each pressing part 35, 36 may directly press the pressure sensor 42 toward the wall part 23. In this case, components other than the pressure sensor 42 and the sensor seal 41 accommodated in the case 21 are provided side by side with the pressure sensor 42 in a direction intersecting the height direction.

The lid 27 of the first embodiment may be used for the transmitter 20 of the second embodiment, and the lid 91 of the second embodiment may be used for the transmitter 20 of the first embodiment.
In the first embodiment, the lid 27 may not include the identification unit 31. In this case, the dimension in the height direction of the second pressing part 36 is made longer than the dimension in the height direction of the first pressing part 35. Thereby, even if the identification part 31 is not provided, the space | interval of the front-end | tip of the 2nd press part 36 and the board | substrate 51 should be made shorter than the space | interval of the front-end | tip of the 1st press part 35, and the board | substrate 51. Can do.

  -In 1st Embodiment, it may replace with the identification part 31 of the lid | cover 27, and may provide another identification part. For example, the first surface 29 and the second surface 30 may be identified by making the shapes of the first pressing portion 35 and the second pressing portion 36 different, or the first surface 29 and the second surface 30 may be identified. You may attach | subject a visible mark.

  -As shown in Drawing 12, each extension part 63 of antenna 61 may be curving in the shape of a circle in the direction which approaches mutually. Even in this case, each extending portion 63 functions as an elastic deformation portion.

  -Any one of each extended part 63 and the base 62 is good also as an elastic deformation part. In this case, before the antenna 61 is accommodated in the case 21, the one that functions as the elastic deformation portion is arcuate, and the one that does not function as the elastic deformation portion is linear.

The antenna 61 does not have to include an elastically deforming portion whose dimension in the height direction changes depending on the distance between the substrate 51 and the wall portion 23.
-Each extension part of the antenna 61 is good also as a coil spring. In this case, the height dimension of the antenna 61 changes due to the elastic deformation of the coil spring.

The antenna 61 may be configured with a metal wire.
As the pressure sensor 42, three or more types of pressure sensors may be accommodated in the case 21. That is, the second pressure sensor is a general term for the pressure sensor 42 having a dimension in the height direction shorter than that of the first pressure sensor 42A, and may be one type or two or more types. In this case, the case 21 is provided with as many pressing portions as the types of pressure sensors 42 that can be accommodated in the case 21.

Of the superposed parts other than the battery 71, the first superposed part or the second superposed part having different height dimensions may be used for the superposed part that receives the force from the pressing portions 35 and 36.
In each embodiment, each pressing portion may press the substrates 51 and 81 and the second battery terminal 53 toward the wall portion 23. In this case, the pressure sensor 42 is pressed against the wall 23 via the substrates 51 and 81 and the second battery terminal 53. In other words, each pressing portion only needs to press one of the plurality of overlapping parts toward the wall portion 23.

The pressure sensor 42 may be pressed against the wall portion 23 via one overlapping component among the plurality of overlapping components, or may be pressed against the wall portion 23 via a plurality of overlapping components.
The transmitter 20 may not be integrated with the tire valve 13. In this case, the transmitter 20 is directly fixed to the tire 14 or the wheel.

The battery may be a primary battery or a secondary battery. A capacitor may be used instead of the battery.
The crushing amount of the sensor seal 41 only needs to be able to seal between the pressure sensor 42 and the wall portion 23. As the pressure sensor 42, the first pressure sensor 42A and the second pressure sensor 42B are used. Thus, the amount of crushing of the sensor seal 41 may be different.

  -The wall part 23 does not need to be provided with the hollow 23b. In this case, the sensor seal 41 is pressed against the tip surface of the protrusion 23a. Moreover, the wall part 23 does not need to be provided with the protrusion 23a. In this case, the recess 23b may or may not be provided in the wall portion 23.

  DESCRIPTION OF SYMBOLS 14 ... Tire, 20 ... Transmitter (tire pressure detection apparatus), 21 ... Case, 23 ... Wall part, 24 ... Perimeter wall, 25 ... Pressure inlet, 26 ... Opening part, 27, 91 ... Lid, 29, 93 ... No. 1 surface, 30, 94 ... 2nd surface, 31, 95 ... identification part, 35, 101, 120 ... 1st press part, 36, 110 ... 2nd press part, 41 ... sensor seal (seal member), 42 ... pressure Sensor, 42A ... 1st pressure sensor, 42B ... 2nd pressure sensor, 43, 44 ... Pressure receiving part, 51, 81 ... Board | substrate (polymerization component), 52, 53 ... Battery terminal (polymerization component), 61 ... Antenna, 62 ... Base part (elastic deformation part), 63 ... Extension part (elastic deformation part), 71 ... Battery (polymerized part), 71A ... First battery (first polymerized part), 71B ... Second battery (second polymerized part).

Claims (5)

A case main body in which a cylindrical peripheral wall is erected from a wall portion having a pressure inlet, and a case having a lid for closing an opening of the case main body,
A pressure sensor housed in the case so that the pressure receiving part is exposed to the gas outside the case through the pressure inlet;
A seal member disposed between the pressure introduction port in the wall and the pressure sensor, and having an elastic force to seal between the pressure introduction port in the wall and the pressure sensor; A tire pressure detecting device that is disposed in the tire and detects the pressure of the tire,
When the direction in which the wall portion and the lid face each other is a height direction, the pressure sensor includes a first pressure sensor or a second pressure sensor having a dimension in the height direction shorter than that of the first pressure sensor.
The case includes a first pressing portion capable of pressing the first pressure sensor against the wall portion via the seal member, and a second pressure capable of pressing the second pressure sensor against the wall portion via the seal member. A pressing portion,
A tire pressure detection device comprising the second pressing portion on the lid. A case main body in which a cylindrical peripheral wall is erected from a wall portion having a pressure inlet, and a case having a lid for closing an opening of the case main body,
A pressure sensor housed in the case so that the pressure receiving part is exposed to the gas outside the case through the pressure inlet;
A seal member disposed between the pressure introduction port in the wall and the pressure sensor, and having an elastic force to seal between the pressure introduction port in the wall and the pressure sensor;
A tire pressure that is disposed in a tire and detects the pressure of the tire, and a superposition part that is a part that overlaps the pressure sensor in the height direction when the direction in which the wall and the lid face each other is a height direction A detection device,
As the superposition part, the first superposition part or the second superposition part whose dimension in the height direction is shorter than the first superposition part,
The case includes a first pressing part capable of pressing the pressure sensor against the wall part through the first overlapping part and the sealing member, and the pressure sensor through the second overlapping part and the sealing member. A second pressing part that can be pressed against the wall part,
A tire pressure detection device comprising the second pressing portion on the lid. The first pressing portion is provided on the lid,
The lid includes a first surface that can be an inner surface of the case, and a second surface that can be an inner surface of the case and is an opposite surface of the first surface,
The tire pressure detection device according to claim 1, wherein the first pressing portion is provided on the first surface, and the second pressing portion is provided on the second surface.   The tire pressure detection device according to claim 3, wherein the lid includes an identification unit for identifying the first surface and the second surface. An antenna for transmitting pressure information detected by the pressure sensor to a receiver;
A substrate to which the antenna is bonded,
The tire according to any one of claims 1 to 4, wherein the antenna includes an elastically deformable portion having a changeable dimension in the height direction at a portion located between the substrate and the wall portion. Pressure detection device.

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