Long-acting automatic constant pressure device for tire pressure of automobile

Abstract

The application discloses a long-acting automatic constant-pressure device for tire pressure of an automobile tire, which is used in cooperation with a tire and a rim, and is of an integrated structure without power supply, an air pump, a pipeline, a mechanical moving part, and an electric control element. A sealed shell is a fully-closed cavity made of airtight material or at least partially containing air-permeable material, and the sealed shell is free of any macroscopic opening. A multi-component gas generating material is a multi-component material capable of spontaneously performing a slow chemical reaction and continuously generating gas under normal temperature and pressure. At least a part of a shell wall of the sealed shell is an air-permeable shell wall, and gas generated by the multi-component gas generating material is released by permeating through the air-permeable shell wall. The application has an extremely simple structure, the multi-component gas generating material spontaneously reacts to generate gas under normal temperature and pressure, the gas permeates through the shell wall to the inner cavity of the tire to realize passive air supplementing, and no external energy source and manual intervention are needed. The gas generation rate is matched with the tire air leakage rate, the tire pressure is long-acting maintained, the service life is 2-3 years, the device has a small volume and a light weight, and is suitable for various pneumatic rubber tires.

Description

Technical Field

[0001] This invention relates to a long-lasting automatic constant pressure device, and more particularly to a long-lasting automatic constant pressure device for automobile tire pressure. Background Technology

[0002] During use and parking, air naturally permeates through the tire's rubber seal, causing tire pressure to gradually decrease. Prolonged underinflation can lead to increased fuel consumption, abnormal tire wear, decreased driving stability, and in severe cases, a risk of tire blowout. Therefore, maintaining tire pressure within the rated range is crucial for both driving safety and vehicle fuel economy.

[0003] To address the issue of slow, natural tire leaks, the following are the main approaches: One method is to manually inflate the tires periodically. This is the most common practice, but it requires the owner to check and replenish the tires frequently, which is inconvenient and easy to miss, leaving the vehicle often running with low tire pressure.

[0004] Second is the vehicle-mounted active inflation system. This type of system typically consists of a power supply, air pump, control valve, piping, and electronic control unit, enabling automatic inflation and pressure regulation. However, it has many components, a relatively complex structure, and higher manufacturing costs and maintenance requirements. Currently, it is mainly used in military vehicles or high-end special vehicles, and its adoption is limited.

[0005] Thirdly, there are chemical emergency inflatable products. These products are mostly canned inflatable sealants that use a chemical reaction to quickly generate gas, primarily for emergency repairs after a tire puncture. However, their gas production time is short and the process is uncontrollable, making them unsuitable for continuous compensation against slow, natural leaks.

[0006] Fourthly, there are mechanical air replenishment devices driven by wheel rotation. Some designs install a miniature air pump or piston mechanism on the wheel rim, relying on the wheel rotation to drive the mechanical parts. Although these devices do not require external circuitry, they contain moving parts, and long-term operation can lead to wear and fatigue issues, making reliability difficult to guarantee. Furthermore, the device's own weight can affect the wheel's dynamic balance. Summary of the Invention

[0007] To address the shortcomings of the aforementioned technologies, this invention provides a long-lasting automatic constant pressure device for automobile tire pressure.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is: a long-lasting automatic constant pressure device for automobile tire pressure, used in conjunction with the tire and rim. The device is an integrated structure without power supply, air pump, pipeline, any mechanical moving parts, or any electronic control components. The device consists only of a gas generating device. The gas generating device includes only a sealed shell and a multi-component gas generating material encapsulated inside the sealed shell. The sealed shell is a fully enclosed cavity made of airtight material or at least partially containing breathable material, and the sealed shell has no macroscopic openings. The multi-component gas generating material is a multi-component material that can spontaneously undergo a slow chemical reaction and continuously generate gas at normal temperature and pressure. At least a portion of the shell wall of the sealed shell is a breathable shell wall, and the gas generated by the multi-component gas generating material permeates and is released to the outside through the breathable shell wall.

[0009] Furthermore, the gas generating device is fixedly mounted on the rim, or mounted on the inner wall / sidewall of the tire.

[0010] Furthermore, the multi-component gas-generating material is a two-component, long-lasting, mild reaction system, consisting of two chemical substances that can undergo a stable and slow chemical reaction under normal temperature and low pressure conditions. The two substances are in direct contact within the sealed shell, forming a continuous reaction environment.

[0011] Furthermore, the gas generation rate of the multi-component gas-generating material is preset by adjusting at least one parameter among the chemical ratio of the components, the contact area between the components, the particle size of the components, and the total filling amount. The preset gas generation rate of the multi-component gas-generating material is matched with the natural permeation leakage rate of the tire to dynamically compensate for the tire pressure loss and achieve passive automatic air replenishment.

[0012] Furthermore, the sealed shell can be in the shape of a capsule, a sheet, or a patch.

[0013] Furthermore, the outer surface of the sealing housing is provided with an adhesive layer for attaching and fixing the gas generating device to the inner side of the rim or the inner wall of the tire.

[0014] Furthermore, the air-generating device can operate continuously and stably for 2 to 3 years, and is only used to compensate for the natural leakage loss of the tire, without participating in the adjustment of tire high pressure, low pressure, nail puncture leakage or tire blowout.

[0015] Furthermore, the preparation method includes the following steps: S1: Determine the component ratio, contact area, particle size and filling amount parameters of the multi-component gas-generating material based on the natural permeation leakage rate of the target tire. S2: The prepared multi-component gas-generating material is encapsulated in a sealed housing made of airtight material and / or breathable material to form a gas-generating device through full-closure, and at least a portion of the housing wall of the sealed housing is a breathable housing wall.

[0016] A long-lasting automatic constant pressure device for automobile tires is an integrated structure without power supply, air pump, pipelines, any moving mechanical parts, or any electronic control components. It consists only of a sealed housing and a multi-component gas-generating material encapsulated within it. The structure is extremely simple, with no mechanical or electrical failure points, ensuring high reliability and low cost. The multi-component gas-generating material spontaneously reacts at room temperature and pressure to produce gas, which permeates outwards through the microscopic permeable structure of the housing wall and is released into the tire. The inflation process is entirely passive, requiring no external energy or manual intervention. The gas generation rate of the multi-component gas-generating material matches the tire's natural leakage rate, providing long-term stable compensation for tire pressure loss and maintaining a essentially constant tire pressure. Its service life can reach 2 to 3 years, achieving long-term maintenance-free operation. The device is small in size and lightweight, can be adhesively installed on the rim or inner wall of the tire, has minimal impact on wheel dynamic balance, and is suitable for various types of pneumatic rubber tires. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] In the diagram: 1. Tire; 2. Rim; 3. Gas generating device; 4. Multi-component gas generating material; 5. Permeable shell wall. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, this embodiment relates to a long-lasting automatic constant pressure device for automobile tire pressure, which is used in conjunction with tire 1 and rim 2. The device is an integrated structure without power supply, air pump, pipeline, any mechanical moving parts, or any electronic control components. The air generating device 3 in this embodiment only includes a sealed housing and a multi-component air generating material 4 encapsulated inside the sealed housing. This minimalist structure eliminates pumps, valves, pipelines, and electronic control components, does not rely on external energy, and does not require manual operation. The device itself can operate automatically for a long time.

[0021] The sealing shell is a fully enclosed cavity made of airtight material or at least partially containing breathable material. The sealing shell has no macroscopic openings. At least part of the shell wall of the sealing shell is a breathable shell wall 5. The breathable shell wall 5 allows gas molecules to pass through through the molecular-level micropores of the material itself. The shell structure is still completely closed, which is different from drilling holes or opening channels in the shell. The gas generated by the reaction of the multi-component gas-generating material 4 inside the sealing shell permeates and is released outward through the breathable shell wall 5, directly entering the air cavity inside the tire 1 to compensate for the gas lost due to the natural permeation of the rubber airtight layer and maintain stable tire pressure.

[0022] Multi-component gas-generating material 4 is a multi-component material that can spontaneously undergo a slow chemical reaction and continuously generate gas under normal temperature and pressure. The multi-component gas-generating material 4 is a two-component, long-lasting, mild reaction system composed of two chemical substances that can undergo a stable and slow chemical reaction under normal temperature and low pressure conditions. The two substances are in direct contact within a sealed shell, forming a continuous reaction environment. The reaction process is stable and unaffected by daily fluctuations in the internal air pressure of the tire 1. The gas generation rate of the multi-component gas-generating material 4 is preset by adjusting at least one parameter among the chemical ratio of the components, the contact area between the components, the particle size of the components, and the total filling amount. Based on the natural permeation leakage rate of the target tire 1, the preset gas generation rate of the multi-component gas-generating material 4 is matched with the natural permeation leakage rate of the tire 1 to dynamically compensate for the internal air pressure loss and achieve passive automatic air replenishment. For example, if a typical passenger car tire naturally leaks about 5 to 15 kPa per month, this embodiment can be designed to replenish about 0.2 to 0.3 kPa per day, maintaining a basically constant tire pressure over a long period. The multi-component gas-generating material 4 has a mild reaction, does not release corrosive substances during use, does not generate intense heat, and does not damage the rubber layer of the tire 1 or the metal surface of the rim 2.

[0023] The sealed housing is capsule-shaped, sheet-shaped, or patch-shaped; the outer surface of the sealed housing is provided with an adhesive layer for attaching and fixing the gas generating device 3 to the inner side of the rim 2 or the inner wall of the tire 1; during installation, the gas generating device 3 is fixedly installed on the rim 2, or installed on the inner wall / tire sidewall of the tire 1; this device rotates with the wheel, is lightweight, and within a reasonable range of dynamic balance, and since each wheel needs to be equipped with this device, the overall dynamic balance remains unchanged; the gas continuously generated by the multi-component gas generating material 4 permeates into the internal air cavity of the tire 1 through the permeable housing wall 5, realizing passive automatic air replenishment. The device does not have valves or switches, and the air replenishment process is driven by the reaction characteristics of the multi-component gas generating material 4 itself.

[0024] The air-generating device 3 can work continuously and stably for 2 to 3 years, covering a considerable part of the tire 1's service life. The air-generating device 3 is only used to compensate for the tire 1's natural permeation and leakage loss, and does not participate in the adjustment of tire high pressure, low pressure, nail puncture leakage or tire blowout. In case of serious leakage, the tire 1 still needs to be inspected and repaired.

[0025] The preparation method includes the following steps: S1: Determine the component ratio, contact area, particle size and filling amount parameters of the multi-component gas-generating material 4 according to the natural permeation leakage rate of the target tire 1; S2: Encapsulate the prepared multi-component gas-generating material 4 in a sealed shell made of airtight material and / or breathable material, and perform a fully enclosed encapsulation to form a gas-generating device 3, and ensure that at least a part of the shell wall of the sealed shell is a breathable shell wall 5. The finished product is obtained after the encapsulation is completed.

[0026] This application discloses a long-lasting automatic constant pressure device for automobile tires. It is an integrated structure without a power source, air pump, pipelines, any moving mechanical parts, or any electronic control components. It consists only of a sealed shell and a multi-component gas-generating material encapsulated within it. The structure is extremely simple, with no mechanical or electrical failure points, resulting in high reliability and low cost. The multi-component gas-generating material spontaneously reacts at room temperature and pressure to produce gas, which permeates outwards through the microscopic permeable structure of the shell wall and is released into the tire. The inflation process is entirely passive, requiring no external energy or manual intervention. The gas generation rate of the multi-component gas-generating material matches the tire's natural leakage rate, enabling long-term stable compensation for tire pressure loss and maintaining a essentially constant tire pressure. Its service life can reach 2 to 3 years, achieving long-term maintenance-free operation. The device is small in size and lightweight, can be adhesively installed on the rim or inner wall of the tire, has minimal impact on wheel dynamic balance, and is suitable for various types of pneumatic rubber tires.

[0027] The above embodiments are not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present invention are also within the protection scope of the present invention.

Claims

1. A long-lasting automatic constant pressure device for automobile tire pressure, used in conjunction with a tire (1) and a rim (2), characterized in that: The device is an integrated structure without power supply, air pump, pipeline, any mechanical moving parts, or any electrical control components. The device consists only of a gas generating device (3). The gas generating device (3) includes only a sealed shell and a multi-component gas generating material (4) encapsulated inside the sealed shell. The sealed shell is a fully enclosed cavity made of airtight material or at least partially containing breathable material, and the sealed shell has no macroscopic openings. The multi-component gas generating material (4) is a multi-component material that can spontaneously undergo a slow chemical reaction and continuously generate gas at room temperature and pressure. At least a part of the shell wall of the sealed shell is a breathable shell wall (5), and the gas generated by the multi-component gas generating material (4) permeates and is released to the outside through the breathable shell wall (5).

2. The long-term automatic constant pressure device for automobile tire pressure according to claim 1, characterized in that: The gas generating device (3) is fixedly installed on the rim (2) or on the inner wall / tire wall of the tire (1).

3. The long-term automatic constant pressure device for automobile tire pressure according to claim 1 or 2, characterized in that: The multi-component gas-generating material (4) is a multi-component long-lasting mild reaction system, consisting of two chemical substances that can undergo a stable and slow chemical reaction under normal temperature and low pressure conditions. The two substances are in direct contact within the sealed shell to form a continuous reaction environment.

4. The long-term automatic constant pressure device for automobile tire pressure according to claim 3, characterized in that: The gas production rate of the multi-component gas-generating material (4) is preset by adjusting at least one parameter among the chemical ratio of the components, the contact area between the components, the particle size of the components, and the total filling amount. The preset gas production rate of the multi-component gas-generating material (4) is matched with the natural permeation leakage rate of the tire (1) to dynamically compensate for the loss of tire pressure and realize passive automatic air replenishment.

5. The long-term automatic constant pressure device for automobile tire pressure according to claim 1, characterized in that: The sealed housing is in the shape of a capsule, a sheet, or a patch.

6. The long-term automatic constant pressure device for automobile tire pressure according to claim 1, characterized in that: The outer surface of the sealed housing is provided with an adhesive layer for attaching and fixing the gas generating device (3) to the inner side of the rim (2) or the inner wall of the tire (1).

7. The long-term automatic constant pressure device for automobile tire pressure according to claim 1, characterized in that: The gas generating device (3) can work continuously and stably for 2 to 3 years and is only used to compensate for the natural leakage loss of the tire (1). It does not participate in the adjustment of tire high pressure, low pressure, nail puncture leakage or tire blowout.

8. The long-term automatic constant pressure device for automobile tire pressure according to claim 1, characterized in that, The preparation method includes the following steps: S1: Based on the natural permeation leakage rate of the target tire (1), determine the component ratio, contact area, particle size and filling amount parameters of the multi-component gas-generating material (4); S2: The prepared multi-component gas-generating material (4) is encapsulated in a sealed shell made of airtight material and / or breathable material to form a gas-generating device (3) through full-closure encapsulation, and at least a portion of the shell wall of the sealed shell is a breathable shell wall (5).

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