A tire pressure sensor

Abstract

The utility model relates to the technical field of vehicle safety, specifically relates to a tire pressure sensor, including upper casing, lower casing, PCB board, air inlet and base, base installation is in lower casing, lower casing is connected with upper casing, and the inside of lower casing and upper casing forms the installation cavity, and the PCB board sets up in the installation cavity, and the PCB board is connected with the base, and the base is provided with the air -guide hole, and the air inlet is installed in the air -guide hole, base is equipped with the sealing groove that surrounds the air -guide hole, still include first sealing washer, and first sealing washer is equipped with the sealing part for embedding sealing groove. Through the embedding of sealing groove and sealing part, can effectively prevent gas leakage, improve the air -tightness, ensure the accuracy of tire internal pressure monitoring, can block the outside dust, moisture enters the sensor inside, prolongs the sensor life, especially suitable for complex road conditions, simultaneously, the nesting design of sealing groove and sealing part optimizes the space utilization, reduces the overall volume, is convenient for installing in the narrow space of tire.

Description

Technical Field

[0001] This utility model relates to the technical field of vehicle safety, and more specifically, to a tire pressure sensor. Background Technology

[0002] As a core component of modern vehicle safety systems (TPMS), tire pressure sensors directly impact driving safety and the driving experience. Their main function is to collect and transmit real-time data on tire pressure and temperature. When excessively high or low tire pressure, or abnormal temperature rise, is detected, the vehicle's onboard system promptly alerts the driver, effectively preventing safety hazards such as tire blowouts, loss of control, and abnormal tire wear caused by abnormal tire pressure. With increasingly stringent automotive safety regulations and rising consumer demands for active safety features, tire pressure sensors have evolved from high-end features to standard equipment in passenger and commercial vehicles.

[0003] Typical tire pressure sensors are installed inside the tire, usually fixed to the valve stem base or the inside of the wheel hub, directly exposed to the high-pressure, dynamically changing tire gas environment. During vehicle operation, the sensor must continuously withstand the centrifugal force generated by high-speed rotation, severe mechanical vibration and impact caused by different road conditions, drastic temperature fluctuations caused by tire-road friction, and possible external environmental factors (such as rain, de-icing agents, and mud). This extreme and variable working environment places more stringent requirements on the sensor's structural integrity, material durability, and especially its sealing performance.

[0004] However, most existing tire pressure sensors still have significant shortcomings in their sealing structure design. Their sealing solutions typically rely on a single omnidirectional annular gasket, achieving static sealing through simple compression assembly. The limitations of this structure are becoming increasingly apparent under long-term dynamic load conditions. Under continuous high-frequency vibration, the single gasket is prone to stress relaxation, creep, or permanent deformation, leading to gaps at the sealing interface and causing slow leakage or media intrusion. In a wide temperature range, the thermal expansion coefficients of the sealing material and the metal / plastic housing do not match, easily causing seal failure during thermal cycling. Traditional radial compression sealing requires extremely high precision in parts machining and assembly consistency, making it difficult to maintain an ideal compression ratio in actual mass production and after-sales replacement. When exposed to complex chemical environments such as ozone, oil mist, and salt, conventional rubber materials may age faster, reducing seal life.

[0005] The aforementioned defects collectively lead to problems such as rapid degradation of airtightness, shortened service life, high false alarm rate, and premature failure under harsh conditions in existing tire pressure sensors. These issues not only affect driving safety but also increase maintenance costs and concerns for car owners. There is an urgent need for a tire pressure sensor with higher reliability, better sealing, stronger environmental adaptability, and a longer service life. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology in that it has only one function, and to provide a tire pressure sensor that can improve and optimize the airtightness under high air pressure conditions. It has a simple structure and low cost.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a tire pressure sensor, including an upper housing, a lower housing, a PCB board, an air inlet, and a base. The base is installed on the lower housing, and the lower housing is connected to the upper housing. An installation cavity is formed inside the lower housing and the upper housing. The PCB board is disposed in the installation cavity and connected to the base. The base has an air guide hole, and the air inlet is installed in the air guide hole. The base has a sealing groove surrounding the air guide hole. It also includes a first sealing gasket, which has a sealing part for embedding into the sealing groove.

[0008] This utility model discloses a tire pressure sensor that effectively prevents gas leakage and improves airtightness by fitting a sealing groove and a sealing part together, ensuring the accuracy of tire internal pressure monitoring. It also prevents external dust and moisture from entering the sensor, extending its lifespan, and is particularly suitable for complex road conditions (such as muddy or wet environments). The nested design of the sealing boss and sealing groove optimizes space utilization, reduces overall volume, and facilitates installation in the confined space of the tire.

[0009] The air intake is mounted on the air duct and directly contacts the valve core. It is mechanically secured at the air duct to prevent breakage or detachment due to tire rotation or bumps. The PCB board directly contacts the tire's internal pressure, collecting data in real time and avoiding errors from indirect measurements (such as estimating tire pressure via wheel speed sensors). The PCB board is directly linked to tire pressure, providing independent tire pressure information even in the event of malfunctions in other vehicle systems. It is compatible with various vehicle models and supports standardized direct tire pressure monitoring requirements.

[0010] Furthermore, the base is provided with a sealing boss, a sealing groove is provided inside the sealing boss, and a retaining ring is provided on the outer periphery of the sealing part for embedding the sealing boss. When the sealing part is embedded in the sealing groove, the sealing boss is simultaneously embedded in the retaining ring, further improving the sealing performance.

[0011] Furthermore, it also includes a waterproof ring, which is installed at the connection between the lower and upper housings. The waterproof ring forms a second layer of sealing protection, further enhancing the tire pressure sensor's water resistance and preventing rainwater and car wash water penetration. In high-temperature, low-temperature, or high-humidity environments (such as coastal areas), the waterproof ring effectively prevents internal components from getting damp or freezing, ensuring long-term stable operation of the sensor. If the waterproof ring is damaged, it can be replaced individually without disassembling the entire sensor, reducing maintenance costs.

[0012] Furthermore, it also includes a battery, which is installed in the mounting cavity and electrically connected to the PCB board. The battery provides an independent power source for the PCB board, avoiding reliance on the vehicle's power supply system and ensuring continuous monitoring even after the vehicle is turned off. The independent power supply design also reduces electromagnetic interference and improves the stability of signal transmission on the PCB board.

[0013] Furthermore, it also includes a mounting bracket for securing the battery, which is inserted into the PCB board. The PCB board is connected to the base, and the mounting bracket, inserted into the PCB board, prevents the battery from shifting within the mounting cavity, ensuring the reliability of the electrical connection. The mounting bracket connects the battery and the PCB board respectively, and also serves as a conductor. In addition, the mounting bracket can be pre-installed with the battery and PCB board, reducing on-site installation steps and improving production efficiency.

[0014] Furthermore, the mounting bracket is equipped with cushioning material. The mounting bracket absorbs vibrations from the tires during driving through the cushioning material, preventing damage to the battery and PCB board due to vibration.

[0015] Furthermore, the base is equipped with a mounting bracket, on which the PCB board is mounted. The mounting bracket ensures that the PCB board is precisely aligned with the air vent, avoiding air pressure monitoring errors caused by installation deviations.

[0016] Furthermore, the base is equipped with a copper insert for connecting the valve core, and the copper insert has internal threads. The copper insert is directly threaded to the valve core, requiring no additional tools and simplifying the installation process. The internal thread specifications are standardized to accommodate valve cores from different tire brands.

[0017] Furthermore, a second sealing gasket is installed between the copper insert and the air intake. The second sealing gasket works in conjunction with the first sealing gasket to form a "double seal," and the internal threads of the copper insert connect with the valve core threads, creating multiple seals and significantly improving air leakage resistance. The second sealing gasket is made of an elastic material, which can adapt to minor deformations during threaded connections, preventing seal failure due to vibration or temperature changes. The second sealing gasket compensates for thread wear, reducing the risk of air leakage due to long-term use.

[0018] Furthermore, the upper and lower housings are threaded together, which allows for a quick and convenient sealing connection.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] (1) The fitting of the sealing groove and sealing part, along with the design of the sealing boss and retaining ring, effectively prevents gas leakage, improves airtightness, and ensures the accuracy of tire internal pressure monitoring. It can block external dust and moisture from entering the sensor, extending the sensor's lifespan, and is especially suitable for complex road conditions (such as muddy or wet environments). The nested design of the sealing boss and sealing groove optimizes space utilization, reduces the overall volume, and facilitates installation in the narrow space of the tire;

[0021] (2) The waterproof ring forms a second layer of sealing protection, further improving the water resistance of the tire pressure sensor and preventing rainwater and car wash water from penetrating. In high temperature, low temperature, or high humidity environments (such as coastal areas), the waterproof ring can effectively prevent internal components from getting damp or freezing, ensuring long-term stable operation of the sensor. When the waterproof ring is damaged, it can be replaced separately without disassembling the entire sensor, reducing maintenance costs;

[0022] (3) The copper insert is equipped with a second sealing gasket. The second sealing gasket works in conjunction with the first sealing gasket to form a "double seal," significantly improving the air leakage resistance. The second sealing gasket is made of elastic material, which can adapt to the slight deformation during threaded connection, avoiding seal failure due to vibration or temperature changes. The second sealing gasket compensates for thread wear, reducing the risk of air leakage due to long-term use. Attached Figure Description

[0023] Figure 1 This is a perspective view of the tire pressure sensor in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the tire pressure sensor in an embodiment of the present invention from a first-view perspective;

[0025] Figure 3 This is a schematic diagram of the internal structure of the tire pressure sensor in an embodiment of the present invention from a second perspective.

[0026] Figure 4 This is a schematic diagram of the base structure in an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the first sealing gasket in an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the air inlet installation in an embodiment of this utility model.

[0029] In the attached diagram: 1-Upper housing; 2-Lower housing; 3-Base; 31-Air vent; 32-Sealing boss; 33-Sealing groove; 34-Fixing seat; 35-First sealing gasket; 351-Sealing part; 4-Waterproof ring; 5-PCB board; 6-Battery; 7-Fixing bracket; 8-Air inlet. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] Example 1

[0033] like Figures 1 to 5 As shown, a tire pressure sensor includes an upper housing 1, a lower housing 2, a PCB board 5, an air inlet 8, and a base 3. The base 3 is mounted on the lower housing 2, and the lower housing 2 is threadedly connected to the upper housing 1. An installation cavity is formed inside the lower housing 2 and the upper housing 1. The PCB board 5 is disposed in the installation cavity and connected to the base 3. The base 3 has an air guide hole 31, and the air inlet 8 is installed in the air guide hole 31. The base 3 has a sealing groove 33 surrounding the air guide hole 31. It also includes a first sealing gasket 35, which has a sealing part 351 for embedding into the sealing groove 33. In this embodiment, the base 3 is provided with a sealing boss 32, and a sealing groove 33 is provided within the sealing boss 32. A retaining ring is provided on the outer periphery of the sealing part 351 for embedding into the sealing boss 32. During installation, the sealing part 351 is embedded into the sealing groove 33, and the sealing boss 32 is embedded into the retaining ring, achieving a full fit between the first sealing gasket 35 and the base 3. This effectively prevents gas leakage, improves airtightness, and ensures the accuracy of tire internal pressure monitoring. It can also prevent external dust and moisture from entering the sensor, extending the sensor's lifespan, and is especially suitable for complex road conditions (such as muddy or humid environments). The nested design of the sealing boss 32 and the sealing groove 33 optimizes space utilization, reduces the overall volume, and facilitates installation in the confined space of the tire.

[0034] The air intake 8 directly contacts the valve core, reducing interference in the signal transmission path and improving the stability of wireless communication. Installed in the air duct 31, the air intake 8 allows the PCB board to directly contact the tire's internal air pressure, eliminating the need for additional wiring, saving space and reducing manufacturing costs. The air intake 8 is mechanically supported at the air duct 31 to prevent breakage or detachment due to tire rotation or bumps. The PCB board 5 directly contacts the tire's internal air pressure, collecting data in real time and avoiding errors from indirect measurements (such as estimating tire pressure using wheel speed sensors). The PCB board 5 is directly linked to tire pressure, providing independent tire pressure information even if other vehicle systems malfunction. It is compatible with various vehicle models and supports the standardized requirements of direct tire pressure monitoring.

[0035] In addition, a waterproof ring 4 is included, which is installed at the threaded connection between the lower housing 2 and the upper housing 1. The waterproof ring 4 forms a second layer of sealing protection, further enhancing the water resistance of the tire pressure sensor and preventing rainwater and car wash water from penetrating. In high-temperature, low-temperature, or high-humidity environments (such as coastal areas), the waterproof ring 4 can effectively prevent internal components from getting damp or freezing, ensuring long-term stable operation of the sensor. If the waterproof ring 4 is damaged, it can be replaced separately without disassembling the entire sensor, reducing maintenance costs.

[0036] Example 2

[0037] In this embodiment, apart from the parts that are the same as in Embodiment 1 above, the difference is as follows: Figure 2 , Figure 3 As shown, it also includes a battery 6, which is installed in the mounting cavity and electrically connected to the PCB board 5. The battery 6 provides an independent power supply to the PCB board 5, avoiding reliance on the vehicle's power supply system and ensuring that the sensor can continue monitoring even after the vehicle is turned off. This independent power supply design also reduces electromagnetic interference and improves the stability of sensor signal transmission.

[0038] In addition, a mounting bracket 7 for securing the battery 6 is included, which is inserted into the PCB board 5. The PCB board 5 is connected to the base 3, and the mounting bracket 7, inserted into the PCB board 5, prevents the battery 6 from shifting within the mounting cavity, ensuring the reliability of the electrical connection. Both ends of the mounting bracket 7 are mounted to the power interfaces of the PCB board 5, and the top of the mounting bracket 7 contacts the battery 6, acting as a conductor. Furthermore, the mounting bracket 7 can be pre-installed with the battery 6 and the PCB board 5, reducing on-site installation steps and improving production efficiency. In this embodiment, the mounting bracket 7 is equipped with cushioning material. The mounting bracket 7 absorbs vibrations during tire movement through the cushioning material, preventing damage to the battery 6 and the PCB board 5 due to vibration.

[0039] Furthermore, the base 3 is provided with a fixing seat 34, on which the PCB board 5 is mounted. The fixing seat 34 ensures that the PCB board 5 is precisely aligned with the air inlet 8, avoiding air pressure monitoring errors caused by installation deviations.

[0040] Example 3

[0041] In this embodiment, apart from the parts that are the same as in Embodiments 1 and 2 above, the difference in this embodiment is as follows: Figure 6 As shown, base 3 is equipped with a copper insert for connecting the valve core, and the copper insert has internal threads. The copper insert is directly threaded to the valve core, requiring no additional tools and simplifying the installation process. The internal thread specification is standardized to adapt to valve cores of different tire brands.

[0042] A second sealing gasket is installed between the copper insert and the air inlet 8. The second sealing gasket works in conjunction with the first sealing gasket 35 to form a "double seal," and the internal thread of the copper insert connects with the valve core thread, creating multiple seals and significantly improving air leakage resistance. The second sealing gasket is made of an elastic material, which can adapt to minor deformations during threaded connection, preventing seal failure due to vibration or temperature changes. The second sealing gasket compensates for thread wear, reducing the risk of air leakage due to long-term use.

[0043] The upper housing 1 and the lower housing 2 are threaded together, which allows for a quick and convenient sealing connection.

[0044] The working principle of this invention is as follows: The tire pressure sensor of this invention is threadedly connected to the tire valve core via a copper insert in the base 3. During the connection process, the second sealing gasket is in close contact with the valve core, forming the first airtight barrier; simultaneously, the sealing part 351 of the base 3 is embedded in the sealing groove 33, and the sealing boss 32 is embedded in the retaining ring, forming the second airtight barrier, ensuring that the internal tire pressure will not leak through the connection between the PCB board 5 and the valve core. The waterproof ring 4 at the connection between the lower housing 2 and the upper housing 1 provides a third layer of sealing protection, preventing external moisture and dust from entering the sensor.

[0045] When the tire is operating normally, the internal tire pressure enters the sensor mounting cavity through the air inlet 8. The PCB board 5 contains a chip for detecting tire pressure; the chip directly contacts the internal tire pressure to detect pressure changes in real time. Because the PCB board 5 is mounted on the mounting base 34, precise alignment with the air inlet 8 is ensured, making pressure detection more accurate.

[0046] PCB board 5 is powered by battery 6, which is fixedly connected to PCB board 5 via bracket 7 to prevent poor electrical contact caused by vibration. Battery 6 adopts a low-power design, and through intelligent power management by the microcontroller, it ensures that PCB board 5 continues to operate during vehicle operation, while extending the battery 6's lifespan. The electrical connection between battery 6 and PCB board 5 ensures a stable power supply for signal processing and wireless transmission.

[0047] In summary, this tire pressure sensor, through the design of the sealing boss 32 and sealing groove 33, effectively prevents gas leakage and improves airtightness by fitting with the first sealing gasket 35, ensuring the accuracy of tire internal pressure monitoring. It can prevent external dust and moisture from entering the sensor, extending its lifespan, and is particularly suitable for complex road conditions (such as muddy or wet environments). The nested design of the sealing boss 32 and sealing groove 33 optimizes space utilization, reduces the overall volume, and facilitates installation in the confined space of the tire. The waterproof ring 4 forms a second layer of sealing protection, further enhancing the water resistance of the tire pressure sensor and preventing rainwater and car wash water penetration. In high-temperature, low-temperature, or high-humidity environments (such as coastal areas), the waterproof ring 4 effectively prevents internal components from getting damp or freezing, ensuring long-term stable operation of the sensor. The waterproof ring 4 can be replaced individually when damaged, without disassembling the entire sensor, reducing maintenance costs. A second sealing gasket is installed on the internal thread. The second sealing gasket works synergistically with the first sealing gasket 35 to form a "double seal," significantly improving air leakage resistance. The second sealing gasket is made of elastic material, which can adapt to minor deformations during threaded connections, preventing seal failure due to vibration or temperature changes. The second sealing gasket compensates for thread wear, reducing the risk of air leakage due to long-term use.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A tire pressure sensor, comprising an upper housing (1), a lower housing (2), a PCB board (5), an air inlet (8), and a base (3), wherein the base (3) is mounted on the lower housing (2), the lower housing (2) is connected to the upper housing (1), and an installation cavity is formed inside the lower housing (2) and the upper housing (1), the PCB board (5) is disposed in the installation cavity, the PCB board (5) is connected to the base (3), the base (3) has an air guide hole (31), and the air inlet (8) is mounted on the air guide hole (31); characterized in that, The base (3) is provided with a sealing groove (33) surrounding the air guide hole (31); it also includes a first sealing gasket (35), which is provided with a sealing part (351) for embedding into the sealing groove (33).

2. A tire pressure sensor according to claim 1, characterized in that, The base (3) is provided with a sealing boss (32), the sealing groove (33) is provided in the sealing boss (32), and the outer periphery of the sealing part (351) is provided with a retaining ring for embedding the sealing boss (32).

3. A tire pressure sensor according to claim 1, characterized in that, It also includes a waterproof ring (4), which is installed at the connection between the lower housing (2) and the upper housing (1).

4. A tire pressure sensor according to claim 3, characterized in that, It also includes a battery (6), which is installed in the mounting cavity and is electrically connected to the PCB board (5).

5. A tire pressure sensor according to claim 4, characterized in that, It also includes a mounting bracket (7) for fixing the battery (6), the mounting bracket (7) being inserted into the PCB board (5).

6. A tire pressure sensor according to claim 5, characterized in that, The fixing frame (7) is equipped with cushioning cotton.

7. A tire pressure sensor according to claim 1, characterized in that, The base (3) is provided with a fixing seat (34), and the PCB board (5) is mounted on the fixing seat (34).

8. A tire pressure sensor according to claim 1, characterized in that, The base (3) is provided with a copper insert for connecting the valve core, and the copper insert is provided with an internal thread.

9. A tire pressure sensor according to claim 8, characterized in that, A second sealing gasket is installed between the copper insert and the air inlet (8).

10. A tire pressure sensor according to any one of claims 1 to 9, characterized in that, The upper housing (1) is threadedly connected to the lower housing (2).

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