Tire valve and tire valve unit

Abstract

A tire valve (11) is fitted to a wheel (200). A tire (202) is fitted to the wheel (200). The tire valve (11) is provided with a cylindrical valve stem (12). The valve stem (12) comprises: an insertion portion (14) that is inserted into a hole (201) provided in the wheel (200); a gas filling portion (21) that is located outside the wheel (200) and is configured such that a filling device for filling the tire (202) with gas can be fitted thereto; and a fitting portion (31) that is located outside the wheel (200) and is configured such that a pressure detecting device (70) for detecting the pressure inside the tire (202) can be fitted thereto. The tire valve (11) is provided with a first valve core (51) accommodated in the gas filling portion (21), and a second valve core (61) accommodated in the fitting portion (31).

Description

Tire Valve and Tire Valve Unit

[0001] The present disclosure relates to a tire valve and a tire valve unit.

[0002] The tire pressure monitoring device disclosed in Patent Document 1 is attached to a tire valve. The tire pressure monitoring device includes a cylindrical main body, an attachment portion attached to the tire valve, a chamber, and a valve accommodated in the main body. By attaching the attachment portion to the tire valve, the inside of the tire communicates with the inside of the main body. The main body is provided with a hole that connects the inside of the main body and the inside of the chamber. The hole is provided at a position between the valve and the attachment portion. The valve opens when air is filled into the tire.

[0003] The tire pressure monitoring device includes a sensor unit accommodated in the chamber. The sensor unit includes a battery, a pressure sensor, a control circuit, and an antenna. The battery serves as a power source for the sensor unit. The pressure sensor detects the pressure inside the tire. The control circuit transmits information indicating the pressure acquired from the pressure sensor from the antenna to a receiver.

[0004] Japanese Unexamined Patent Application Publication No. 2012-144246

[0005] There are cases where the sensor unit needs to be removed from the chamber due to sensor unit failure, insufficient remaining battery capacity, or maintenance of the sensor unit. In such cases, air inside the tire flows out through the hole, which may cause a decrease in pressure inside the tire.

[0006] According to a first aspect of the present disclosure, a tire valve mounted on a wheel is provided. A tire is mounted on the wheel. The tire valve comprises a cylindrical valve stem. The valve stem comprises an insertion portion inserted into a hole provided in the wheel, a gas filling portion located outside the wheel and configured to connect to a filling device for filling the tire with gas, and a mounting portion located outside the wheel and configured to mount a pressure detection device for detecting the pressure inside the tire. The tire valve comprises a first valve core housed in the gas filling portion and a second valve core housed in the mounting portion. The second valve core comprises a valve body and a shaft portion that moves integrally with the valve body. When the pressure detection device is mounted in the mounting portion, the pressure detection device presses the shaft portion, causing the valve body to move and the second valve core to open.

[0007] When the pressure detection device is removed from the mounting portion, the second valve core closes. This prevents gas from leaking out of the tire from the mounting portion. In the above tire valve, the mounting portion extends in the axial direction of the insertion portion. The gas filling portion extends in a direction intersecting the axial direction of the insertion portion.

[0008] Regarding the tire valve described above, the second valve core comprises a valve body configured to move inside the valve stem, a sealing member that seals the space between the mounting portion and the valve body, and a spring that biases the valve body toward the sealing member. The valve body comprises a contact portion that is in close contact with the sealing member and a shaft portion that extends from the contact portion. The mounting portion comprises a seal housing portion that houses the sealing member and a support portion that supports the spring.

[0009] Regarding the above tire valve, the first valve core is configured to be detachably attached to the gas filling portion. Regarding the above tire valve, the second valve core is configured to be detachably attached to the mounting portion.

[0010] A second aspect of the present disclosure provides a tire valve unit comprising a tire valve mounted on a wheel and a pressure detection device configured to detect the pressure inside a tire mounted on the wheel. The tire valve comprises a cylindrical valve stem. The valve stem comprises an insertion portion inserted into a hole provided in the wheel, a gas filling portion located outside the wheel and configured to connect to a gas filling device for filling the tire with gas, and a mounting portion located outside the wheel and configured to mount the pressure detection device. The tire valve comprises a first valve core housed in the gas filling portion and a second valve core housed in the mounting portion. The second valve core comprises a valve body and a shaft portion that moves integrally with the valve body. When the pressure detection device is mounted in the mounting portion, the pressure detection device presses against the shaft portion, causing the valve body to move and the second valve core to open.

[0011] When the pressure detection device is removed from the mounting part, the second valve core closes. This prevents gas from leaking out of the tire from the mounting part. The valve stem of the tire valve unit is made of metal. The pressure detection device has a metal contact part. The mounting part has a contact surface configured to be in close contact with the contact part.

[0012] In the above-mentioned tire valve unit, the pressure detection device and the mounting portion are screwed together.

[0013] Figure 1 is a cross-sectional view of a tire valve unit. Figure 2 is a cross-sectional view showing an enlarged portion of the tire valve unit of Figure 1. Figure 3 is a cross-sectional view of a comparative example tire valve unit. Figure 4 is a cross-sectional view showing an example of a modified tire valve unit.

[0014] An embodiment of a tire valve and tire valve unit will be described. As shown in Figure 1, the tire valve unit 10 is mounted on a wheel 200. The wheel 200 is, for example, a wheel of a two-wheeled vehicle. The wheel 200 may also be a wheel of a four-wheeled vehicle. The wheel 200 has a hole 201. A tire 202 is mounted on the wheel 200. When the tire 202 is mounted on the wheel 200, an internal space St surrounded by the wheel 200 and the tire 202 is defined. Inside the tire 202 means inside the internal space St. Outside the tire 202 means outside the internal space St. Outside the wheel 200 means outside the internal space St. Inside the wheel 200 means inside the internal space St.

[0015] The tire valve unit 10 comprises a tire valve 11 and a pressure detection device 70. <Tire Valve> The tire valve 11 comprises a cylindrical valve stem 12. The valve stem 12 is made of metal. The term "cylindrical" may refer to a structure that forms a loop, i.e., a continuous shape without ends. The shape of a "cylindrical" shape includes, but is not limited to, circular, elliptical, and polygonal shapes with pointed or rounded corners.

[0016] The valve stem 12 includes a base portion 13. The base portion 13 includes an insertion portion 14 and a branch portion 15. The base portion 13 is hollow. The interior of the base portion 13 is a first space S1. The insertion portion 14 is, for example, cylindrical. The size of the insertion portion 14 is set so that it can be inserted into the hole 201. For example, the outer diameter of the insertion portion 14 is smaller than the diameter of the hole 201. The insertion portion 14 may be configured to allow a nut to be fastened. For example, a male thread may be formed on the outer circumferential surface of the insertion portion 14 to allow a nut to be fastened.

[0017] The branching portion 15 is continuous with the insertion portion 14. The branching portion 15 is, for example, cylindrical. The branching portion 15 cannot be inserted into the hole 201. For example, the outer diameter of the branching portion 15 is larger than the diameter of the hole 201. The diameter of the branching portion 15 may decrease as it moves away from the insertion portion 14.

[0018] The branch portion 15 includes a wheel contact surface 16. The wheel contact surface 16 is the surface that contacts the wheel 200 when the insertion portion 14 is inserted into the hole 201. The branch portion 15 includes a groove 17 that is recessed from the wheel contact surface 16. The tire valve 11 includes a valve seal member 18 that is housed in the groove 17.

[0019] The valve stem 12 includes a gas filling section 21. The gas filling section 21 is continuous with the branch section 15. The gas filling section 21 is cylindrical. The gas filling section 21 is hollow. The inside of the gas filling section 21 is a second space S2. The second space S2 is connected to the first space S1. The gas filling section 21 is configured to be connectable to a filling device for filling the tire 202 with gas. The gas filling section 21 has an open end 22. The open end 22 is provided at the tip of the gas filling section 21. The open end 22 of the gas filling section 21 is configured as a connection port for connecting the air chuck of the filling device.

[0020] The gas filling section 21 is provided so as to extend from the branching section 15 in a direction intersecting the axial direction of the insertion section 14. For example, the gas filling section 21 is inclined so that it moves further away from the wheel 200 as it approaches the opening end 22. The tire valve 11 is equipped with a valve cap 23 that is attached to the gas filling section 21.

[0021] The valve stem 12 includes a mounting portion 31. The mounting portion 31 is continuous with the branching portion 15. Thus, the gas filling portion 21 and the mounting portion 31 branch off from the branching portion 15. The mounting portion 31 is configured to accommodate a pressure detection device 70. The mounting portion 31 extends from the branching portion 15 in the axial direction of the insertion portion 14. The mounting portion 31 includes a first portion 32 and a second portion 34. The first portion 32 is continuous with the branching portion 15. The first portion 32 is provided at the end of the branching portion 15 opposite to the end where the insertion portion 14 is provided. The first portion 32 includes a contact surface 33. The contact surface 33 is a part of the outer surface of the first portion 32. The contact surface 33 is a flat surface that extends in a direction perpendicular to the axial direction of the insertion portion 14.

[0022] The second portion 34 protrudes from the contact surface 33. The second portion 34 is cylindrical. A male thread 35 is formed on the outer circumferential surface of the second portion 34. By fastening this male thread 35 to the pressure detection device 70, the pressure detection device 70 can be attached to the mounting portion 31. The mounting portion 31 has an open end 36. The open end 36 is provided at the tip of the second portion 34.

[0023] As shown in Figure 2, the interior of the mounting portion 31 is a third space S3. The third space S3 comprises a small space Sa, a medium space Sb, and a large space Sc. The cross-sectional area of ​​the small space Sa is smaller than the cross-sectional area of ​​the medium space Sb. The cross-sectional area of ​​the medium space Sb is smaller than the cross-sectional area of ​​the large space Sc. The small space Sa, medium space Sb, and large space Sc are arranged in the order of small space Sa → medium space Sb → large space Sc as they move away from the base portion 13.

[0024] The inner surface of the first portion 32 includes a first inner surface 37, a second inner surface 38, and a support portion 39. The first inner surface 37 is the surface that forms the small space Sa. The second inner surface 38 is the surface that forms the medium space Sb. The support portion 39 is the surface that extends between the first inner surface 37 and the second inner surface 38. The support portion 39 extends between the first inner surface 37 and the second inner surface 38 in a direction perpendicular to the axial direction of the insertion portion 14. The large space Sc is formed by the inner surface of the second portion 34.

[0025] The mounting portion 31 includes a seal support portion 40. The seal support portion 40 is cylindrical. The seal support portion 40 protrudes from the first portion 32 within the valve stem 12. The seal support portion 40 is hollow. The inner surface of the seal support portion 40 is continuous with the first inner surface 37. The mounting portion 31 includes a seal housing portion 41 between the seal support portion 40 and the inner surface of the valve stem 12.

[0026] As shown in Figure 1, the tire valve 11 includes a first valve core 51. The first valve core 51 is housed in the gas filling section 21. That is, the first valve core 51 is provided in the second space S2. The first valve core 51 is detachable from the valve stem 12.

[0027] The first valve core 51 comprises a core body 52, a rod 55, and a valve body 57. The core body 52 is cylindrical. The core body 52 has a first end 53 and a second end 54. The first end 53 and the second end 54 are separated from each other in the axial direction of the core body 52.

[0028] The rod 55 penetrates the core body 52. ​​The rod 55 has a projection 56. The projection 56 is a part of the rod 55 that protrudes from the first end 53 to the outside of the core body 52.

[0029] The valve body 57 is provided integrally with the rod 55. The valve body 57 is located on the portion of the rod 55 that protrudes from the second end 54. Although not shown in the figures, the first valve core 51 is equipped with a spring that biases the rod 55 from the second end 54 toward the first end 53. As a result, the valve body 57 is pressed against the second end 54, preventing the inflow of gas into the first valve core 51.

[0030] When the rod 55 is pushed in the direction from the first end 53 toward the second end 54, the spring contracts, causing the rod 55 to move in the direction from the first end 53 toward the second end 54. This causes the valve body 57 to move away from the second end 54, thereby allowing gas to flow into the first valve core 51.

[0031] The first valve core 51 is housed in the gas filling section 21 such that its protruding portion 56 faces the open end 22 of the gas filling section 21. The tire valve 11 includes a second valve core 61. The second valve core 61 is housed in the mounting section 31. That is, the second valve core 61 is provided in the third space S3. The second valve core 61 is provided integrally with the valve stem 12. An example of the second valve core 61 will be described below. The structure of the second valve core 61 may differ from the structure described below.

[0032] As shown in Figure 2, the second valve core 61 includes a sealing member 62. The sealing member 62 is housed in a sealing housing 41. The second valve core 61 includes a valve body 63. The valve body 63 includes a sealing portion 64 and a shaft portion 65. The sealing portion 64 is, for example, disc-shaped. The shaft portion 65 extends from the sealing portion 64. The shaft portion 65 is, for example, cylindrical. The shaft portion 65 is insertable into the third space S3. The shaft portion 65 is part of the valve body 63. Therefore, by moving the shaft portion 65, the entire valve body 63 moves. That is, the shaft portion 65 moves together with the valve body 63.

[0033] The contact portion 64 faces the sealing member 62 housed in the sealing housing portion 41. The shaft portion 65 is inserted into the third space S3. More specifically, the shaft portion 65 is inserted from the small space Sa toward the large space Sc. The tip of the shaft portion 65 is located in the large space Sc.

[0034] The second valve core 61 comprises a fixing member 66 and a spring 69. The fixing member 66 is fixed to one end of the spring 69. The fixing member 66 has a hole 67. The fixing member 66 may also have a protruding piece 68. Multiple protruding pieces 68 are provided arranged in the circumferential direction of the hole 67.

[0035] The tip of the shaft portion 65 is press-fitted into the hole 67 of the fixing member 66. This fixes the fixing member 66 to the valve body 63. The spring 69 is provided so as to surround the shaft portion 65. The spring 69 is located between the fixing member 66 and the support portion 39. The spring 69 is supported by the support portion 39. As the fixing member 66 is fixed to the shaft portion 65, the elastic force of the spring 69 is applied from the fixing member 66 to the valve body 63. The spring 69 biases the valve body 63 toward the seal member 62. In detail, the spring 69 biases the valve body 63 toward the open end 36 of the mounting portion 31 so that the contact portion 64 and the seal member 62 are in close contact. As the contact portion 64 and the seal member 62 are in close contact, the seal member 62 seals the space between the mounting portion 31 and the valve body 63.

[0036] As the spring 69 contracts, the valve body 63 moves towards the first space S1 inside the valve stem 12. This causes the contact portion 64 to separate from the sealing member 62. <Pressure detection device> The pressure detection device 70 detects the pressure inside the tire 202 and transmits data indicating the detected pressure to the receiver. The receiver may be mounted on the vehicle or may be a portable terminal owned by the user. The receiver monitors the pressure of the tire 202 and notifies the user if an abnormality occurs in the pressure of the tire 202.

[0037] As shown in Figure 1, the pressure detection device 70 includes a housing 71. The housing 71 includes a base 72. The base 72 is plate-shaped. The base 72 includes a first surface 73 and a second surface 74. The first surface 73 and the second surface 74 are opposite to each other.

[0038] The housing 71 includes a retaining portion 75. The retaining portion 75 is cylindrical. The retaining portion 75 is hollow. The retaining portion 75 protrudes from the first surface 73. The housing 71 also includes a housing portion 76. The housing portion 76 is cylindrical. The housing portion 76 is hollow. The housing portion 76 protrudes from the second surface 74.

[0039] The housing 71 is provided with a protruding portion 77. The protruding portion 77 is columnar in shape. The protruding portion 77 is integrally provided with the base portion 72. The protruding portion 77 protrudes from the first surface 73 of the base portion 72. The protruding portion 77 protrudes into the holding portion 75.

[0040] As shown in Figure 2, the pressure detection device 70 includes a fastening portion 80. The fastening portion 80 is made of metal. The fastening portion 80 includes a wall portion 81 and a female thread portion 83. The wall portion 81 is, for example, plate-shaped. The wall portion 81 has a through hole 82. The size of the through hole 82 is set so that the protruding portion 77 can be inserted. For example, the diameter of the through hole 82 is larger than the diameter of the protruding portion 77. The female thread portion 83 is cylindrical. The female thread portion 83 protrudes from the periphery of the wall portion 81. A female thread 84 is formed on the inner surface of the female thread portion 83. The female thread portion 83 has an open end 85. The open end 85 is provided at the tip of the female thread portion 83.

[0041] The fastening portion 80 is held by the holding portion 75. The wall portion 81 is in contact with the first surface 73. The protruding portion 77 penetrates the through hole 82 and protrudes into the female screw portion 83. The female screw portion 83 is provided along the inner surface of the holding portion 75.

[0042] The pressure detecting device 70 includes a packing 86. The packing 86 is accommodated in the fastening portion 80. The packing 86 is provided along the wall portion 81. The protruding portion 77 penetrates the packing 86.

[0043] As shown in Fig. 1, the pressure detecting device 70 includes a cover 87. The cover 87 is fixed to the accommodating portion 76. For example, the cover 87 may be fixed to the accommodating portion 76 by fastening a male screw provided on an outer surface of the accommodating portion 76 and a female screw provided on the cover 87. A space surrounded by the cover 87 and the accommodating portion 76 is an accommodating space S4.

[0044] The pressure detecting device 70 includes a sensor unit 90. The sensor unit 90 is accommodated in the accommodating space S4. The sensor unit 90 includes a pressure sensor 91, a battery 92, and a transmission circuit 93.

[0045] The pressure sensor 91 includes a pressure receiving portion 94. The pressure sensor 91 detects pressure applied to the pressure receiving portion 94. Although not illustrated, the pressure detecting device 70 includes an introduction path that introduces the pressure of the third space S3 to the pressure receiving portion 94. Thereby, the pressure sensor 91 detects the pressure of the third space S3.

[0046] The battery 92 serves as a power source for the sensor unit 90. For example, the battery 92 serves as a power source for the pressure sensor 91 and the transmission circuit 93. The transmission circuit 93 is a circuit for transmitting the detection result of the pressure sensor 91 to a receiver. When the detection result of the pressure sensor 91 is transmitted to the receiver by the transmission circuit 93, pressure monitoring is performed by the receiver.

[0047] When the female screw portion 83 is fastened to the second portion 34, the pressure detecting device 70 is attached to the tire valve 11. That is, the pressure detecting device 70 and the attachment portion 31 are screwed together. The opening end 85 of the female screw portion 83 is in close contact with the contact surface 33. The opening end 85 is an example of a metal contact portion.

[0048] The protruding portion 77 presses the tip end of the shaft portion 65. When the shaft portion 65 is pressed, the gap between the fixing member 66 and the support portion 39 is narrowed, and the spring 69 is contracted. The contact portion 64 is separated from the seal member 62 by an amount corresponding to the contraction of the spring 69. In this way, when the pressure detection device 70 is mounted on the mounting portion 31, the pressure detection device 70 presses the shaft portion 65, which causes the valve body 63 to move, thereby opening the second valve core 61. Accordingly, the first space S1 and the third space S3 are connected to the aforementioned introduction passage. That is, the first space S1, the third space S3, and the introduction passage have the same pressure. Accordingly, the pressure sensor 91 detects the pressure in the internal space St, that is, the pressure inside the tire 202. The open end 36 of the second portion 34 presses the packing 86. Accordingly, the crushing amount of the packing 86 is secured, and the sealing performance between the pressure detection device 70 and the tire valve 11 is ensured.

[0049] The tire valve unit 10 is mounted to the wheel 200 by inserting the insertion portion 14 into the hole 201 of the wheel 200. For example, by fastening a nut to the insertion portion 14 inserted into the hole 201 of the wheel 200, the wheel 200 is sandwiched between the nut and the branching portion 15, whereby the tire valve 11 is mounted to the wheel 200. The wheel contact surface 16 and the valve seal member 18 are in contact with the wheel 200. In a state where the tire valve unit 10 is mounted to the wheel 200, the first space S1 and the internal space St are communicated with each other. Accordingly, the pressure sensor 91 detects the pressure of the internal space St. The gas filling portion 21 and the mounting portion 31 are located outside the wheel 200.

[0050] [Operation of this embodiment] If the sensor unit 90 malfunctions, the pressure detection device 70 may be removed from the tire valve 11 for the purpose of repairing or replacing the sensor unit 90. If the battery 92 runs out of charge, the pressure detection device 70 may be removed from the tire valve 11 for the purpose of replacing the battery 92 or the sensor unit 90. When the pressure detection device 70 is removed from the tire valve 11 in this way, the protruding part 77 no longer presses against the valve body 63, causing the second valve core 61 to close. Therefore, even if the pressure detection device 70 is removed, gas is less likely to be discharged from the tire 202.

[0051] In this embodiment, the tire valve 11 has contact between the open end 85 of the fastening portion 80 and the contact surface 33. This prevents the pressure detection device 70 from loosening due to metal-to-metal contact.

[0052] As shown in Figure 3, the comparative example tire valve 100 is a snap-in valve. The tire valve 100 comprises a body 101, a valve stem 102, and a valve core 104. The body 101 is made of rubber. The body 101 covers the outer circumference of the valve stem 102. The snap-in valve is mounted on the wheel 200 by press-fitting the body 101 into the hole 201.

[0053] The valve stem 102 has a tip portion 103 that protrudes from the body 101. A male thread is formed on the outer circumferential surface of the tip portion 103. The valve core 104 is similar to, for example, the first valve core 51 in the embodiment.

[0054] In this type of tire valve 100, the length of the tip portion 103 varies depending on the product. Also, the position of the tip of the rod 55 varies depending on the product. If the length of the tip portion 103 is not constant, the open end 85 of the fastening portion 80 cannot be brought into contact with the valve stem 102. To prevent the pressure detection device 70 from loosening, it is preferable to bring metals into contact with each other. For this reason, in the comparative example tire valve 100, a nut 105 is fastened to the tip portion 103, and the open end 85 of the fastening portion 80 is brought into contact with this nut 105, thereby bringing metals into contact. This prevents the pressure detection device 70 from loosening.

[0055] If the pressure detection device 70 is to be prevented from loosening by using the nut 105, then when removing the pressure detection device 70 from the mounting part 31, the nut 105 must be loosened. Therefore, it is necessary to remove the nut 105, which is time-consuming. Furthermore, a tool is required to remove the nut 105.

[0056] If the position of the tip of the rod 55 is not constant, the rod 55 may be pushed more than necessary to ensure that the valve core 104 opens properly. In this case, if the pressure detection device 70 loosens, the open end 36 will separate from the packing 86 before the protrusion 77 stops pushing the rod 55, causing gas to leak from the internal space St. Also, excessive pushing of the rod 55 may reduce the elastic force of the spring that biases the rod 55.

[0057] In contrast, the mounting portion 31 of this embodiment adjusts the length of the second portion 34 so that when the pressure detection device 70 is mounted, the open end 85 of the fastening portion 80 and the contact surface 33 come into contact. As a result, there is no need to use a nut 105 to prevent the pressure detection device 70 from loosening, and the hassle of attaching and detaching the nut 105 is eliminated. Furthermore, no tools are required for attaching or detaching the nut 105.

[0058] Furthermore, by designing the second valve core 61 as a dedicated part for the valve stem 12, the position of the tip of the shaft portion 65 can be kept constant. This prevents the shaft portion 65 from being pushed more than necessary by the protruding portion 77.

[0059] [Effects of this embodiment] (1) The mounting part 31 is equipped with a second valve core 61. When the pressure detection device 70 is removed from the mounting part 31, the second valve core 61 closes. This prevents gas from leaking out of the tire 202 when the pressure detection device 70 is removed from the mounting part 31.

[0060] (2) The mounting portion 31 extends in the axial direction of the insertion portion 14. When the pressure detection device 70 is mounted, the pressure detection device 70 is less likely to interfere with the wheel 200. The gas filling portion 21 extends in a direction intersecting the axial direction of the insertion portion 14. Therefore, it is easy to connect the air chuck of the filling device.

[0061] (3) The second valve core 61 comprises a valve body 63, a sealing member 62, and a spring 69. The sealing member 62 is housed in the sealing housing portion 41. The spring 69 is supported by the support portion 39. In this way, the sealing member 62 can be housed and the spring 69 can be supported by utilizing a part of the valve stem 12. That is, the second valve core 61 is incorporated into the valve stem 12. For this reason, the second valve core 61 can be made smaller compared to the case in which a detachable valve core is used.

[0062] (4) The open end 85 and the contact surface 33 are in close contact. This prevents the pressure detection device 70 from loosening. (5) The first valve core 51 is detachable from the valve stem 12. When gas is to be discharged from the tire 202, the gas can be discharged from the tire 202 in a short time by removing the first valve core 51 from the valve stem 12.

[0063] (6) The pressure detection device 70 is located outside the wheel 200. Compared to the case where the pressure detection device 70 is located inside the wheel 200, this reduces the attenuation of radio waves caused by the tire 202.

[0064] (7) The pressure detection device 70 is located outside the wheel 200. Therefore, when removing the pressure detection device 70 from the mounting part 31, it is not necessary to remove the tire 202 from the wheel 200.

[0065] (8) The tire valve 11 includes a gas filling section 21 and a mounting section 31. When filling the tire 202 with gas, the gas is filled from the gas filling section 21. Therefore, the tire 202 can be filled with gas without removing the pressure detection device 70 from the tire valve 11.

[0066] [Examples of Modifications] The embodiment can be implemented with the following modifications. The embodiment and the following examples of modifications can be combined with each other to the extent that they do not contradict each other technically.

[0067] The second valve core 61 may have a different structure from that of the embodiment. For example, as shown in Figure 4, the second valve core 61 may be the same as that of the first valve core 51. In this case, the second valve core 61 is detachable from the mounting portion 31. The shape of the mounting portion 31 may be changed to match the structure of the second valve core 61. When the second valve core 61 has the same structure as the first valve core 51, the rod 55 is the shaft portion.

[0068] The first valve core 51 may have a different structure from that of the embodiment. For example, the first valve core 51 may have the same structure as the second valve core 61. In this case, the shape of the gas filling section 21 may be changed to match the structure of the first valve core 51.

[0069] - The gas filling section 21 and the mounting section 31 may extend in any direction as long as the filling device and pressure detection device 70 do not interfere with the wheel 200. - The tire valve 11 may be a snap-in valve.

[0070] 10... Tire valve unit, 11... Tire valve, 12... Valve stem, 14... Insertion part, 21... Gas filling part, 31... Mounting part, 33... Contact surface, 39... Support part, 41... Seal housing part, 51... First valve core, 61... Second valve core, 62... Seal member, 63... Valve body, 64... Contact part, 65... Shaft part, 69... Spring, 70... Pressure detection device, 85... Open end which is an example of a contact part, 200... Wheel, 201... Hole, 202... Tire.

Claims

1. A tire valve mounted on a wheel, wherein a tire is mounted on the wheel, the tire valve comprises a cylindrical valve stem, the valve stem comprises an insertion portion inserted into a hole provided in the wheel, a gas filling portion located outside the wheel and configured to connect to a gas filling device for filling the tire with gas, and a mounting portion located outside the wheel and configured to mount a pressure detection device for detecting the pressure inside the tire, the tire valve comprises a first valve core housed in the gas filling portion, and a second valve core housed in the mounting portion, the second valve core comprises a valve body and a shaft portion that moves integrally with the valve body, and the pressure detection device is mounted in the mounting portion so that the pressure detection device presses the shaft portion, causing the valve body to move and the second valve core to open.

2. The tire valve according to claim 1, wherein the mounting portion extends in the axial direction of the insertion portion, and the gas filling portion extends in a direction intersecting the axial direction of the insertion portion.

3. The tire valve according to claim 1, wherein the second valve core comprises a valve body configured to move inside the valve stem, a sealing member for sealing the space between the mounting portion and the valve body, and a spring for biasing the valve body toward the sealing member, the valve body comprises a contact portion for contacting the sealing member and a shaft portion extending from the contact portion, and the mounting portion comprises a seal housing portion for housing the sealing member and a support portion for supporting the spring.

4. The tire valve according to claim 1, wherein the first valve core is configured to be detachably attached to the gas-filled portion.

5. The tire valve according to claim 1, wherein the second valve core is configured to be detachably attached to the mounting portion.

6. A tire valve unit comprising a tire valve mounted on a wheel, and a pressure detection device configured to detect the pressure inside a tire mounted on the wheel, wherein the tire valve comprises a cylindrical valve stem, the valve stem comprises an insertion portion inserted into a hole provided in the wheel, a gas filling portion located outside the wheel and configured to connect to a gas filling device for filling the tire with gas, and a mounting portion located outside the wheel and configured to mount the pressure detection device, the tire valve comprises a first valve core housed in the gas filling portion, and a second valve core housed in the mounting portion, the second valve core comprises a valve body and a shaft portion that moves integrally with the valve body, and the pressure detection device is mounted in the mounting portion, causing the pressure detection device to press the shaft portion, thereby moving the valve body and opening the second valve core, in a tire valve unit.

7. The tire valve unit according to claim 6, wherein the valve stem is made of metal, the pressure detection device has a metal contact portion, and the mounting portion has a contact surface configured to be in close contact with the contact portion.

8. The tire valve unit according to claim 6, wherein the pressure detection device and the mounting portion are screwed together.

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