JP2012148690A - Tire state acquiring device and tire state monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire state acquiring device and a tire state monitoring system capable of solving the problem caused by intrusion of foreign matter into a communicating hole of a casing.SOLUTION: This tire state acquiring device 20 is arranged in a tire cavity part, and acquires a tire state quantity. The tire state acquiring device 20 also includes the casing 26 having an opening part 261, and a plug 27 having a peripheral groove 271 and detachably inserted into the opening part 261 of the casing 26. The peripheral groove 271 of the plug 27 constitutes at least a part of the communicating hole R for communicating the inside of the casing 26 with the cavity part of a pneumatic tire in a state of inserting the plug 27 into the opening part 261 of the casing 26.

Description

  The present invention relates to a tire condition acquisition device and a tire condition monitoring system, and more particularly to a tire condition acquisition apparatus and a tire condition monitoring system that can solve a problem caused by entry of a foreign substance into a communication hole of a housing.

  Conventionally, a tire condition monitoring system for monitoring a tire condition quantity (for example, air pressure, temperature, etc.) of a pneumatic tire is known. A general tire condition monitoring system includes a tire condition acquisition device that is arranged in a hollow portion of a pneumatic tire and acquires a tire condition quantity, and monitors a tire condition quantity acquired by the tire condition acquisition apparatus to obtain a predetermined amount. And a monitoring device that performs processing.

  Further, the tire condition acquisition device is configured by housing electronic components such as a sensor and a circuit board for acquiring a tire condition in a casing. Moreover, this housing | casing has a communicating hole which connects the inside of a housing | casing and the cavity of a tire. And the sensor in a housing | casing has acquired the tire state quantity via this communicating hole.

  However, when foreign matter such as puncture repair liquid or tire strips enters the communication hole of the housing, various problems may arise due to this. For example, there may be a problem that foreign matter closes the communication hole and the tire state quantity cannot be detected, or a foreign matter enters the inside of the housing and the sensor or circuit is damaged. As a conventional tire condition acquisition device and tire condition monitoring system relating to such a problem, a technique described in Patent Document 1 is known.

JP 2008-62730 A

  It is an object of the present invention to provide a tire condition acquisition device and a tire condition monitoring system that can solve the problems caused by the entry of foreign matter into the communication holes of the housing.

  In order to achieve the above object, a tire state acquisition device according to the present invention is a tire state acquisition device that is disposed in a hollow portion of a pneumatic tire and acquires a tire state quantity, and includes a casing having an opening, A plug having a groove and detachably inserted into the opening, and the circumferential groove is formed in the housing and the cavity in a state where the plug is inserted into the opening. And at least a part of a communication hole that communicates with each other.

  A tire condition acquisition device according to the present invention is a tire condition acquisition device that is arranged in a hollow portion of a pneumatic tire and acquires a tire condition quantity, and includes a housing having an opening and an internal passage, and A plug that is detachably inserted into the opening, and the internal passage communicates the interior of the housing with the cavity in a state where the plug is inserted into the opening. It constitutes at least a part of the hole.

  Further, in the tire condition acquisition device according to the present invention, the plug has a protrusion protruding from the outer wall surface of the housing in the installed state of the plug, and the communication hole opens at the top of the protrusion. It is preferable to do.

  In the tire condition acquisition device according to the present invention, it is preferable that the communication hole has a spiral shape or a zigzag shape.

  In the tire condition acquisition device according to the present invention, it is preferable that the communication hole has a linear shape or a curved shape that extends while being inclined with respect to the wall thickness direction of the housing.

  The tire state acquisition device according to the present invention is a tire state acquisition device that is disposed in a hollow portion of a pneumatic tire and acquires a tire state quantity, and includes a housing that houses an electronic component, and the housing The body has a communication hole that allows the inside of the housing to communicate with the cavity, and the communication hole extends in a spiral shape, a zigzag shape, or an inclination with respect to the wall thickness direction of the housing. It has an existing linear shape or curved shape.

  In the tire condition acquisition device according to the present invention, it is preferable that the length L of the communication hole is in a relationship of L / W ≧ 2.0 with respect to the thickness W of the wall portion of the housing.

  Further, a tire condition monitoring system according to the present invention is a tire condition acquisition device according to any one of the above, and a monitoring that performs a predetermined process by monitoring a tire condition amount acquired by the tire condition acquisition device. And a device.

  In the tire condition acquisition device and the tire condition monitoring system according to the present invention, the plug has a circumferential groove, and the circumferential groove constitutes at least a part of the communication hole when the plug is inserted into the opening of the housing. At this time, since the plug is detachably inserted into the opening of the housing, the foreign matter can be removed by replacing or cleaning the plug when the foreign matter blocks the communication hole. Thereby, there exists an advantage which can solve the subject resulting from the penetration | invasion of the foreign material to the communicating hole of a housing | casing.

  Further, in the tire condition acquisition device and the tire condition monitoring system, since the plug is detachably inserted into the opening of the housing, the foreign object is removed by replacing or cleaning the plug when the foreign object blocks the communication hole. Can be removed. Thereby, there exists an advantage which can solve the subject resulting from the penetration | invasion of the foreign material to the communicating hole of a housing | casing.

FIG. 1 is a configuration diagram showing a tire condition monitoring system according to an embodiment of the present invention. FIG. 2 is a block diagram showing a tire condition acquisition device of the tire condition monitoring system shown in FIG. FIG. 3 is a block diagram showing a monitoring device of the tire condition monitoring system shown in FIG. FIG. 4 is an explanatory diagram illustrating an installation state of the tire state acquisition device illustrated in FIG. 2. FIG. 5 is a perspective view illustrating an external configuration of the tire state acquisition device illustrated in FIG. 2. FIG. 6 is a cross-sectional view taken along line AA of the tire state acquisition device illustrated in FIG. 5. FIG. 7 is an enlarged cross-sectional view illustrating a communication hole of the housing of the tire state acquisition device illustrated in FIG. 5. FIG. 8 is a side view showing a plug of the tire condition acquisition device shown in FIG. FIG. 9 is a plan view showing a plug of the tire condition acquisition device described in FIG. 7. FIG. 10 is an explanatory view showing the process of attaching the plug shown in FIG. FIG. 11 is an explanatory view showing a modified example of the communication holes of the housing shown in FIG. FIG. 12 is an explanatory diagram illustrating a modification of the communication hole of the housing illustrated in FIG. 7. FIG. 13 is an explanatory diagram illustrating a modification of the communication hole of the housing illustrated in FIG. 7. FIG. 14 is an explanatory view showing a modification of the communication hole of the housing shown in FIG. FIG. 15 is an explanatory view showing a modified example of the communication holes of the housing shown in FIG. FIG. 16 is an explanatory diagram illustrating a modification of the communication hole of the housing illustrated in FIG. 7. FIG. 17 is an explanatory diagram illustrating a modification of the communication hole of the housing illustrated in FIG. 7. FIG. 18 is a table showing the results of the performance test of the tire condition acquisition device according to the embodiment of the present invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. Further, the constituent elements of this embodiment include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

[Tire condition monitoring system]
FIG. 1 is a configuration diagram showing a tire condition monitoring system according to an embodiment of the present invention. FIG. 2 is a block diagram showing a tire condition acquisition device of the tire condition monitoring system shown in FIG. FIG. 3 is a block diagram showing a monitoring device of the tire condition monitoring system shown in FIG.

  The tire condition monitoring system 10 is a system that monitors the amount of tire condition of the pneumatic tire 110. The tire state quantity refers to, for example, tire air pressure and temperature. Here, as an example of the tire condition monitoring system 10, a TPMS (Tire Pressure Monitoring System) for monitoring the filling air pressure of the pneumatic tire 110 attached to the vehicle will be described. In this embodiment, the vehicle 100 is a four-wheel vehicle, and a pneumatic tire 110 is mounted on each wheel.

  The tire condition monitoring system 10 includes a tire condition acquisition device 20 and a monitoring device 30 (see FIGS. 1 to 3).

  The tire state acquisition device 20 is a device that acquires or detects the tire state amount of the pneumatic tire 110 (see FIG. 1). The tire state acquisition device 20 includes a sensor unit 21, a processing unit 22, a transmitter 23, an antenna 24, and a power supply unit 25 (see FIG. 2). The sensor unit 21 includes an air pressure sensor 211 that detects and outputs a tire air pressure, and an A / D converter 212 that performs analog / digital conversion on an output signal of the air pressure sensor 211 and outputs the converted signal. The processing unit 22 generates, for example, predetermined air pressure data based on an output signal from the air pressure sensor 211 by reading and executing a predetermined program from the storage unit 221 and storing the predetermined program. And a central processing unit 222 for outputting. The transmitter 23 generates an oscillation circuit 231 that generates and outputs a carrier wave signal, a modulation circuit 232 that modulates and outputs a carrier wave signal from the oscillation circuit 231 based on an output signal from the central processing unit 222, and a modulation circuit 232. And an amplifier circuit 233 for amplifying the output signal from the output. The antenna 24 is connected to the amplifier circuit 233 of the transmitter 23. The power supply unit 25 is, for example, a secondary battery, and supplies power to the tire state acquisition device 20.

  The monitoring device 30 is a device that monitors a tire state amount acquired by the tire state acquisition device 20 and performs a predetermined process (see FIG. 1). The monitoring device 30 includes a reception unit 31, an antenna 32, a reception buffer 33, a storage unit 34, a central processing unit 35, an operation unit 361 and a switch 362, a display control unit 37, a display unit 38, And a power supply unit 39 (see FIG. 3). The receiving unit 31 receives a signal related to air pressure data (tire amount) from the tire condition acquisition device 20 via the antenna 32, and extracts and outputs the air pressure data and the identification information data. The antenna 32 is connected to the receiving unit 31. The reception buffer 33 temporarily stores the air pressure data and the identification information data from the reception unit 31. The storage unit 34 stores a predetermined program, a communication method table with the tire condition acquisition device 20, and the like. The central processing unit 35 reads a predetermined program from the storage unit 34 and executes it to perform predetermined processing based on the air pressure data and the identification information data from the reception buffer 33. This process includes, for example, a process for determining an abnormality in tire air pressure, a process for generating a determination result, and a process for displaying the determination result on the display unit 38. The operation unit 361 is an input unit for inputting various information to the monitoring device 30. The switch 362 is an ON / OFF switch for starting the monitoring device 30. The display control unit 37 controls the display content of the display unit 38 based on the output signal from the central processing unit 35. The display part 38 is arrange | positioned at the driver's seat of the vehicle 100, for example, and displays a predetermined display content. The power supply unit 39 is, for example, a battery of the vehicle 100 and supplies power to the monitoring device 30.

  In the tire condition monitoring system 10, four tire condition acquisition devices 20 are respectively installed on pneumatic tires 110 attached to four wheels of the vehicle 100 (see FIG. 1). And each tire state acquisition apparatus 20 each detects the air pressure of the pneumatic tire 110 as a tire state quantity. Specifically, the sensor unit 21 detects the tire air pressure, the processing unit 22 generates air pressure data based on the detection signal, and the transmitter 23 generates a transmission signal based on the air pressure data to generate the antenna 24. To the monitoring device 30 via Thereby, the air pressure of the pneumatic tire 110 is acquired.

  Moreover, the monitoring apparatus 30 performs abnormality determination based on the tire state amount acquired from the tire state acquisition apparatus 20, displays the determination result, and notifies the driver. Specifically, the central processing unit 35 performs abnormality determination based on the air pressure data acquired from the tire state acquisition device 20. At this time, it is used as a determination condition that the tire air pressure is equal to or lower than a predetermined threshold value, or that the tire air pressure suddenly drops in a short time. Then, the central processing unit 35 causes the display unit 38 to display information related to tire air pressure based on the determination result. At this time, information such as tire air pressure and occurrence of puncture is displayed corresponding to the tire mounting position. Thereby, the tire state quantity is appropriately monitored, and the driver is notified.

[Specific example of tire condition acquisition device]
FIG. 4 is an explanatory diagram illustrating an installation state of the tire state acquisition device illustrated in FIG. 2. FIG. 5 is a perspective view illustrating an external configuration of the tire state acquisition device illustrated in FIG. 2. FIG. 6 is a cross-sectional view taken along line AA of the tire state acquisition device illustrated in FIG. 5. These drawings show specific examples of the tire condition acquisition device.

  In this embodiment, the pneumatic tire 110 is a pneumatic radial tire for a vehicle and is attached to the rim 120 (see FIG. 4). And the tire condition acquisition apparatus 20 is accommodated and arrange | positioned in the cavity X of the tire 110. FIG. The hollow portion X is a sealed space partitioned into an inner peripheral surface of the tire 110 and an outer peripheral surface of the rim 120. By filling the cavity X with air, an internal pressure is applied to the tire 110.

  The tire condition acquisition device 20 includes a rectangular casing 26, and the sensor unit 21, the processing unit 22, the transmitter 23, the antenna 24, and the power supply unit 25 are accommodated in the casing 26. (See FIGS. 5 and 6). Further, the tire condition acquisition device 20 is attached to the insertion side end of the tire valve 130 and integrated with the tire valve 130. And the tire condition acquisition apparatus 20 is inserted in the cavity part X of a tire with the tire valve 130, and is fixed on the outer peripheral surface of the rim | limb 120 (refer FIG. 4).

  Moreover, the tire state acquisition apparatus 20 has the communication hole R in the housing | casing 26 (refer FIG. 5 and FIG. 6). The communication hole R is a hole that communicates the inside of the housing 26 with the tire cavity X, and is used here to detect tire state quantities such as tire air pressure and temperature. The communication hole R is always in an open state when the tire state quantity is detected. In this embodiment, the communication hole R is formed on the upper surface of the casing 26 having a rectangular shape. The structure of the communication hole R will be described later.

  In this embodiment, the air pressure sensor 211 for detecting the tire filling air pressure is housed in the casing 26 of the tire condition acquisition device 20 (see FIG. 6). However, the present invention is not limited to this, and a sensor that detects other tire state quantities, for example, a temperature sensor may be housed in the housing 26. In addition, the casing 26 can be accommodated in an exposed state of electronic components and circuit boards that constitute the sensor unit 21, the processing unit 22, the transmitter 23, and the like.

  The tire condition acquisition device 20 is applied to, for example, a pneumatic tire 110 having the following structure (not shown). That is, the pneumatic tire 110 includes a bead core, a carcass layer, a belt layer, a tread rubber, and a sidewall rubber. Further, the bead core has an annular structure and is configured as a pair of left and right. The carcass layer is bridged in a toroidal shape between the left and right bead cores to form a tire skeleton. The belt layer includes a plurality of stacked belt plies, and is disposed on the outer periphery in the tire radial direction of the carcass layer. Moreover, tread rubber is arrange | positioned at the tire radial direction outer periphery of a carcass layer and a belt layer, and comprises the tread part of a tire. Further, the side wall rubber is configured as a pair of left and right, and is disposed on the outer side in the tire width direction of the carcass layer to form the side wall portion of the tire.

[Communication hole in the chassis of the tire condition acquisition device]
FIG. 7 is an enlarged cross-sectional view illustrating a communication hole of the housing of the tire state acquisition device illustrated in FIG. 5. 8 and 9 are a side view (FIG. 8) and a plan view (FIG. 9) showing the plug of the tire condition acquisition device shown in FIG. FIG. 10 is an explanatory view showing the process of attaching the plug shown in FIG.

  A general tire state acquisition device is arranged in a hollow portion of a pneumatic tire and acquires a tire state amount. Moreover, the housing | casing which accommodates electronic components, such as a sensor for acquiring a tire state, and a circuit board, is provided. Moreover, this housing | casing has a communicating hole which connects the inside of a housing | casing and the cavity of a tire. And the sensor in a housing | casing has acquired the tire state quantity via this communicating hole.

  However, when foreign matter such as puncture repair liquid or tire strips enters the communication hole of the housing, various problems may arise due to this. For example, there may be a problem that foreign matter closes the communication hole and the tire state quantity cannot be detected, or a foreign matter enters the inside of the housing and the sensor or circuit is damaged.

  Therefore, the tire state acquisition device 20 employs the following configuration in order to solve the problems caused by the entry of foreign matter into the communication hole R (see FIGS. 7 to 10).

  The tire state acquisition device 20 includes a housing 26 having an opening 261 and a plug 27 having a circumferential groove 271 and detachably inserted into the opening 261 of the housing 26 (see FIG. 7). In the state where the plug 27 is inserted into the opening 261 of the housing 26, at least a part of the communication hole R through which the circumferential groove 271 of the plug 27 communicates the inside of the housing 26 and the cavity X of the tire 110. Configure.

  For example, in this embodiment, the housing 26 has a rectangular shape, and has a circular opening 261 on the upper surface thereof (see FIGS. 5 and 6). Moreover, the plug 27 is comprised from the insertion part 272 and the flange part 273 (refer FIG. 8 and FIG. 9). Moreover, the insertion part 272 has a cylindrical shape and has a spiral circumferential groove 271 on the outer peripheral surface thereof. The circumferential grooves 271 are opened at both ends of the insertion portion 272 in the axial direction. The flange portion 273 has an annular structure, and is fitted and fixed to the outer periphery of the end portion of the insertion portion 272. Then, the plug 27 inserts and inserts the insertion portion 272 into the opening portion 261 of the housing 26, and the flange portion 273 is brought into contact with and engaged with the outer wall surface of the housing 26. It is attached to 261 and fixed (see FIGS. 7 and 10). At this time, in order to fix the plug 27 to the housing 26, the insertion portion 272 may be press-fitted into the opening 261 of the housing 26, or the flange portion 273 may be engaged with a locking piece or You may fix to the wall surface of the housing | casing 26 by fixing means, such as a screw (illustration omitted). And the helical communication hole R is formed when the circumferential groove 271 of the insertion part 272 opens in the inside of the housing | casing 26, and the cavity part X of the tire 110, respectively.

  In such a configuration, since the plug 27 is detachably inserted into the opening 261 of the housing 26, the plug 27 can be replaced or cleaned when a foreign object blocks the communication hole R. Therefore, when the foreign matter blocks the communication hole R, the foreign matter can be removed by replacing or cleaning the plug 27. Further, when the plug 27 is removed from the housing 26 and cleaned, the circumferential groove 271 is exposed to the insertion portion 272, so that the cleaning becomes easy. Further, since the plug 27 side has the circumferential groove 271 serving as the communication hole R, the structure of the opening 261 on the housing 26 side can be simplified.

[Modification]
11-17 is explanatory drawing which shows the modification of the communicating hole of the housing | casing described in FIG.

  In the embodiment of FIG. 7, the flange portion 273 has an annular structure and is fitted and fixed to the outer periphery of the end portion of the insertion portion 272 (see FIGS. 7 to 9).

  However, the present invention is not limited thereto, and the flange portion 273 may have a sleeve structure formed by extending the inner diameter portion into a cylindrical shape (see FIG. 11). The plug 27 is configured by inserting and inserting the insertion portion 272 having the circumferential groove 271 into the flange portion 273. As a result, a spiral internal passage (a portion partitioned by the circumferential groove 271 of the insertion portion 272 and the inner peripheral surface of the flange portion 273) is formed inside the plug 27. When the plug 27 is attached to the opening 261 of the housing 26, a spiral communication hole R is formed by the internal passage of the plug 27 (see FIG. 12).

  In the embodiment of FIG. 7, the flange portion 273 has an annular structure and is fitted and fixed to the outer periphery of the end portion of the insertion portion 272 (see FIGS. 7 to 9). For this reason, the top part (end surface by the side of the flange part 273) of the plug 27 becomes flat, and the circumferential groove 271 of the insertion part 272 is opened in this flat top part.

However, the present invention is not limited thereto, and the plug 27 has a protrusion 274 that protrudes from the outer wall surface of the housing 26 in a state where the plug 27 is attached to the opening 261 of the housing 26, and the communication hole R You may open to the top part of the projection part 274 (refer FIG. 13 and FIG. 14). At this time, the height H of the protrusion 274 is preferably H ≧ 1 [mm]. Moreover, it is preferable that the opening area (cross-sectional area of the hole 275) S of the communication hole R in the top part of the projection part 274 is S <= 0.4 [mm < ² >]. In such a configuration, since the communication hole R opens at the top of the protrusion 274, foreign matter is less likely to enter the communication hole R compared to a configuration in which the plug 27 has a flat top (see FIG. 7). Thereby, the penetration | invasion of the foreign material to the communicating hole R is suppressed effectively.

  For example, in the embodiment of FIGS. 13 and 14, the plug 27 includes a hollow member having a frustum shape (here, a truncated cone shape) and a hole 275 at the bottom (see FIG. 13). And the insertion part 272 which has the circumferential groove 271 is inserted and inserted in the opening part of this hollow member, and the plug 27 is comprised. In this plug 27, the edge of the opening of the hollow member (the fitting portion with the insertion portion 272) becomes the flange portion 273. Further, the frustum-shaped portion of the hollow member is referred to as a protrusion 274. At this time, the circumferential groove 271 of the insertion portion 272 and the internal space of the projection 274 communicate with each other, whereby the circumferential groove 271 and the hole 275 at the top of the projection 274 communicate with each other. When the plug 27 is attached to the opening 261 of the housing 26, the outside of the housing 26 is passed from the inside of the housing 26 through the peripheral groove 271 of the insertion portion 272, the internal space of the projection 274, and the hole 275. A communication hole R that communicates with is formed. Further, the protrusion 274 of the plug 27 has a diameter narrowed in the protruding direction, and has a hole 275 at the top. This makes it difficult for foreign matter to enter from the hole 275.

  In the embodiment of FIG. 7, the communication groove R has a spiral shape because the circumferential groove 271 of the plug 27 has a spiral shape (see FIGS. 7 and 8).

  However, not limited to this, the communication hole R may have a zigzag shape (not shown). As described above, in the configuration in which the communication hole R has a spiral shape or a zigzag shape, the foreign matter that has entered the communication hole R is likely to stay in the communication hole R compared to the configuration in which the communication hole R has a linear shape. As a result, the entry of foreign matter into the interior of the housing 26 is suppressed. In addition, the communication hole R may have a linear shape or a curved shape that extends while being inclined with respect to the wall thickness direction of the housing 26 (not shown). In such a configuration, the total length of the communication holes R can be extended as compared with a configuration in which the communication holes R extend in the wall thickness direction of the housing 26. Thereby, there exists an advantage by which the penetration | invasion of the foreign material to the inside of the housing | casing 26 is suppressed.

  In the embodiment of FIG. 7, the housing 26 has an opening 261, and the plug 27 having the circumferential groove 271 is fitted into the opening 261, so that the communication hole R of the housing 26 is formed. (See FIGS. 7 and 8). Such a configuration is preferable in that the plug 27 can be attached and detached, so that the plug 27 can be replaced or cleaned.

  However, the present invention is not limited to this, and the opening 261 and the plug 27 of the housing 26 may be omitted, and the communication hole R may be directly formed in the wall portion of the housing 26 (see FIGS. 15 to 17). At this time, the communication hole R has a spiral shape (see FIG. 15), a zigzag shape (see FIG. 16), or a linear shape that extends while inclining with respect to the wall thickness direction of the housing 26 (see FIG. 17). Alternatively, it preferably has a curved shape (not shown). As a result, the entry of foreign matter into the interior of the housing 26 is suppressed.

  In this tire state acquisition device 20, the length L of the communication hole R may have a relationship of L / W ≧ 2.0 with respect to the thickness W of the wall portion of the housing 26 (see FIG. 7). preferable. Thereby, since the length L of the communication hole R is optimized, the entry of foreign matter into the housing 26 is suppressed.

[effect]
As described above, the tire condition acquisition device 20 is arranged in the tire cavity X and acquires the tire condition quantity (see FIG. 4). The tire condition acquisition device 20 includes a housing 26 having an opening 261, and a plug 27 having a circumferential groove 271 and detachably inserted into the opening 261 of the housing 26 (FIGS. 7 to 7). (See FIG. 10). Then, in a state where the plug 27 is inserted into the opening 261 of the housing 26, at least one of the communication holes R through which the circumferential groove 271 of the plug 27 communicates the inside of the housing 26 and the cavity X of the tire 110. Parts.

  In such a configuration, the plug 27 has the circumferential groove 271 and the plug 27 is inserted into the opening 261 of the housing 26, whereby the circumferential groove 271 constitutes at least a part of the communication hole R (see FIG. 10). . At this time, since the plug 27 is detachably inserted into the opening 261 of the housing 26, when the foreign matter blocks the communication hole R, the foreign matter can be removed by replacing or cleaning the plug 27. Thereby, there exists an advantage which can solve the subject resulting from the penetration | invasion of the foreign material to the communication hole R of the housing | casing 26. FIG.

  Further, the tire state acquisition device 20 includes a casing 26 having an opening 261 and an internal passage (a portion partitioned by the circumferential groove 271 of the insertion portion 272 and the inner peripheral surface of the flange portion 273) and the casing. The plug 27 is detachably inserted into the opening 261 of the 26 (see FIGS. 11 and 12). In a state where the plug 27 is inserted into the opening 261 of the housing 26, at least a part of the communication hole R through which the internal passage of the plug 27 communicates with the inside of the housing 26 and the cavity X of the tire 110 is formed. Constitute. In such a configuration, since the plug 27 is detachably inserted into the opening 261 of the housing 26, the foreign matter can be removed by replacing or cleaning the plug 27 when the foreign matter blocks the communication hole R. Thereby, there exists an advantage which can solve the subject resulting from the penetration | invasion of the foreign material to the communication hole R of the housing | casing 26. FIG.

  Further, in the tire condition acquisition device 20, the plug 27 has a protrusion 274 that protrudes from the outer wall surface of the housing 26 in the installed state, and the communication hole R opens at the top of the protrusion 274 ( (See FIG. 14). In such a configuration, since the communication hole R opens at the top of the protrusion 274, foreign matter is less likely to enter the communication hole R compared to a configuration in which the plug 27 has a flat top (see FIG. 7). Thereby, there exists an advantage by which the penetration | invasion of the foreign material to the communicating hole R is suppressed effectively.

  Further, in the tire state acquisition device 20, the communication hole R has a spiral shape or a zigzag shape (see FIGS. 15 and 16). In such a configuration, compared to a configuration in which the communication hole R has a linear shape, foreign matter that has entered the communication hole R is likely to stay in the middle of the communication hole R. Thereby, since the intrusion of foreign matter into the inside of the housing 26 is suppressed, for example, there is an advantage that the electronic components accommodated in the housing 26 are appropriately protected.

  Further, in the tire state acquisition device 20, the communication hole R has a linear shape or a curved shape that extends while being inclined with respect to the wall thickness direction of the housing 26 (see FIG. 17). In such a configuration, the total length of the communication holes R can be extended as compared with a configuration in which the communication holes R extend in the wall thickness direction of the housing 26. Thereby, there exists an advantage by which the penetration | invasion of the foreign material to the inside of the housing | casing 26 is suppressed.

  The tire condition acquisition device 20 includes a housing 26 that houses electronic components (for example, a sensor unit 21, a processing unit 22, a transmitter 23, etc., not shown), and the housing 26 includes a housing. A communication hole R for communicating the inside of the body 26 with the cavity X of the tire 110 is provided (see FIGS. 15 to 17). And this communication hole R is helical shape (refer FIG. 15), zigzag shape (refer FIG. 16), or the linear shape extended while inclining with respect to the wall thickness direction of the housing | casing 26 (refer FIG. 17). Alternatively, it has a curved shape (not shown). Even with such a configuration, there is an advantage that entry of foreign matter into the inside of the housing 26 is suppressed.

  Further, in the tire state acquisition device 20, the length L of the communication hole R is in a relationship of L / W ≧ 2.0 with respect to the thickness W of the wall portion of the housing 26 (see FIG. 7). In such a configuration, since the length L of the communication hole R is optimized, there is an advantage that entry of foreign matter into the housing 26 is suppressed.

  FIG. 18 is a table showing the results of the performance test of the tire condition acquisition device according to the embodiment of the present invention.

  In this example, a performance test on the ease of entry of foreign matter into the housing was performed on a plurality of different tire state acquisition devices (see FIG. 18). In this performance test, a pneumatic tire having a tire size of 195 / 65R15 is assembled to an applicable rim stipulated by JATMA, and an air pressure of 200 [kPa] and a maximum load capacity stipulated by JATMA are given to the pneumatic tire. Further, the tire condition acquisition device is integrated with the tire valve and installed in the hollow portion between the pneumatic tire and the rim. Then, this tire is set in a drum testing machine, and a puncture repair solution is injected into the tire to run at a running speed of 30 [km / h]. Moreover, it is observed every 30 minutes whether the repair liquid has entered the housing of the tire condition acquisition device. And evaluation is performed on the basis of the point of time when the repair liquid enters the housing of the conventional tire state acquisition device.

  In the tire state acquisition devices 20 of the first to fifth embodiments, the communication hole R of the housing 26 extends while inclining with respect to the wall thickness direction of the housing 26 as shown in FIG. 1) A curved shape (Example 2) extending while being inclined with respect to the wall thickness direction of the casing 26, or a spiral shape (Examples 3 to 5) as shown in FIG. . On the other hand, in the conventional tire state acquisition device, the communication hole of the housing has a linear shape extending in the wall thickness direction of the housing.

  As shown in the test results, it can be seen that the tire condition acquisition devices 20 of Examples 1 to 5 are less likely to intrude foreign substances into the housing than the conventional tire condition acquisition devices.

  DESCRIPTION OF SYMBOLS 10 Tire condition monitoring system, 20 Tire condition acquisition apparatus, 21 Sensor unit, 211 Air pressure sensor, 212 A / D converter, 22 Processing unit, 221 Memory | storage part, 222 Central processing part, 23 Transmitter, 231 Oscillation circuit, 232 Modulation Circuit, 233 amplifier circuit, 24 antenna, 25 power supply unit, 26 housing, 261 opening, 27 plug, 271 circumferential groove, 272 insertion unit, 273 flange unit, 274 projection unit, 275 hole, 30 monitoring device, 31 receiving unit , 32 antenna, 33 reception buffer, 34 storage unit, 35 central processing unit, 361 operation unit, 362 switch, 37 display control unit, 38 display unit, 39 power supply unit, 100 vehicle, 110 pneumatic tire, 120 rim, 130 tire Valve, R communication hole, X cavity

Claims (8)

A tire condition acquisition device that is arranged in a hollow portion of a pneumatic tire and acquires a tire condition quantity,
A housing having an opening; and a plug having a circumferential groove and detachably inserted into the opening; and the circumferential groove is inserted into the opening. A tire condition acquisition device comprising at least a part of a communication hole for communicating the inside of the casing with the hollow portion. A tire condition acquisition device that is arranged in a hollow portion of a pneumatic tire and acquires a tire condition quantity,
A housing having an opening, and an internal passage and a plug that is detachably inserted into the opening, and the internal passage is in a state in which the plug is inserted into the opening. A tire condition acquisition device comprising at least a part of a communication hole for communicating the inside of the casing with the hollow portion.   The tire condition acquisition according to claim 1 or 2, wherein the plug has a protrusion protruding from an outer wall surface of the housing in the installed state of the plug, and the communication hole opens at a top of the protrusion. apparatus.   The tire condition acquisition device according to any one of claims 1 to 3, wherein the communication hole has a spiral shape or a zigzag shape.   The tire condition acquisition device according to any one of claims 1 to 3, wherein the communication hole has a linear shape or a curved shape extending while being inclined with respect to a wall thickness direction of the housing. A tire condition acquisition device that is arranged in a hollow portion of a pneumatic tire and acquires a tire condition quantity,
A housing that houses an electronic component, and the housing has a communication hole that communicates the inside of the housing with the cavity, and the communication hole has a spiral shape, a zigzag shape, or the A tire condition acquisition device having a linear shape or a curved shape extending while being inclined with respect to a wall thickness direction of a housing.   The tire condition acquisition device according to any one of claims 1 to 6, wherein a length L of the communication hole is in a relationship of L / W ≧ 2.0 with respect to a thickness W of the wall portion of the housing. .   A tire state acquisition device according to any one of claims 1 to 7, and a monitoring device that monitors a tire state amount acquired by the tire state acquisition device and performs a predetermined process. Tire condition monitoring system.

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