Air tap cap capable of displaying tire pressure by pressing

Abstract

The invention provides an air tap cap capable of displaying tire pressure by pressing, which relates to the technical field of air tap caps and comprises a metal shell, a metal ejector pin movably arranged in the metal shell and used for moving downwards during pressing to jack up a valve core to open the valve core for deflation and resetting after the pressing is released, and a compression spring connected with the metal ejector pin and used for pressing the metal ejector pin to display the tire pressure. The expansion sealing ring is arranged in the metal shell, is in linkage with the valve core, expands and jacks up the green cylinder during deflation, the valve core is temporarily jacked up by adopting pressing operation to measure the tire pressure, and the valve core can be automatically reset and closed after pressing is finished. The problems that a traditional tire pressure cap ejector pin jacks a valve core for a long time and cannot be closed, and airtightness is poor are solved, it is guaranteed that gas in a tire can be stably stored, normal air pressure is maintained, and the service life of the tire is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of air valve caps, and in particular to an air valve cap capable of displaying tire pressure by pressing. Background Art

[0002] With the widespread use of non-motorized vehicles (such as bicycles and electric vehicles) in daily travel, tire maintenance and tire pressure monitoring are gaining increasing attention. As a key factor affecting riding safety, comfort, and tire life, accurate monitoring of tire pressure and ensuring a good airtightness are particularly important.

[0003] Among existing products on the market, there is a common tire pressure cap, originally designed to help users understand the tire's pressure. This tire pressure cap is usually installed by screwing onto the valve cap. It has an internal ejector pin. During installation and operation, this built-in ejector pin pushes up the valve core, thereby deflating the tire and providing a certain degree of tire pressure measurement.

[0004] However, these traditional tire pressure caps have exposed problems during actual use. Their ejector pins often remain in the lifted position for a long time after lifting the valve core. This prevents the valve core from returning to its closed position, thus losing its original airtight function. Over time, the gas in the tire will gradually leak out, resulting in a poor airtightness. This poor airtightness not only affects the riding experience, such as making riding more strenuous and increasing the bumpiness, but more seriously, tires that are underinflated for a long time will wear faster, greatly shortening the tire's service life and even causing safety hazards during riding, such as blowouts and other accidents.

[0005] Therefore, we propose a valve cap that can display the tire pressure by pressing it. Summary of the Invention

[0006] The present invention aims to address the shortcomings of the existing technology. Currently, a common tire pressure cap on the market is one that screws onto the valve cap and features an internal ejector pin. While this is intended to help users understand tire pressure, in actual use, the ejector pin often remains in this position after lifting the valve core, preventing it from closing and resulting in poor airtightness. This impacts the riding experience, accelerates tire wear, and can even lead to safety hazards such as blowouts.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A valve cap for displaying tire pressure by pressing, comprising:

[0009] Metal casing;

[0010] A metal ejector pin is movably disposed in the metal housing and is used to move downward when pressed to lift the valve core to open the valve and release air, and to return to its original position by rebounding after the pressure is released;

[0011] A compression spring connected to the metal ejector pin, used to store force when pressed and drive the metal ejector pin to reset after release;

[0012] An expansion seal ring is provided in the metal housing and is linked to the valve core to expand and lift up the green cylinder when air is released;

[0013] A green tube and a yellow tube, wherein when the tire pressure is sufficient, the green tube is lifted up by the expansion seal ring to cover the yellow tube, forming a visual indication of the tire pressure status;

[0014] A PC transparent shell, covering the outside of the metal shell, is used to observe the position changes of the green tube and the yellow tube;

[0015] The O-type dynamic sealing ring and the valve nozzle mounting sealing gasket are used to ensure the airtightness between the valve cap and the valve nozzle.

[0016] As a preferred solution of the present invention, it also includes a valve core and a Schrader valve. The valve core and Schrader valve are installed on the tire of a non-motor vehicle and are connected with this product for use.

[0017] As a preferred solution of the present invention, the valve cap temporarily lifts the valve core by pressing to measure the tire pressure, and the valve core automatically returns to its original position and closes after the pressure is released.

[0018] As a preferred solution of the present invention, the end of the metal ejector pin is provided with a tapered structure for accurately triggering the opening and closing action of the valve core.

[0019] As a preferred solution of the present invention, the expansion sealing ring is made of a high-temperature resistant rubber material, and its expansion coefficient is linearly related to the change in tire pressure.

[0020] As a preferred solution of the present invention, the outer surface of the PC transparent shell is provided with an anti-ultraviolet coating to delay aging and improve crack resistance.

[0021] As a preferred solution of the present invention, the inner wall of the metal shell is provided with a guide groove structure for limiting the moving paths of the green tube and the yellow tube.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the present invention, a pressing operation is adopted to temporarily lift the valve core to measure the tire pressure. After the pressing is completed, the valve core can automatically reset and close, avoiding the problem of the traditional tire pressure cap needle lifting the valve core for a long time, resulting in inability to close and poor airtightness, ensuring that the gas in the tire can be stably preserved, maintaining normal air pressure, and extending the service life of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the main structure of a valve cap for displaying tire pressure by pressing provided by the present invention;

[0025] Figure 2 A schematic diagram of a conventional air retention state of a main body cross-section of a tire pressure display provided by the present invention;

[0026] Figure 3 This is a schematic diagram of the main cross-section of a valve cap for displaying tire pressure provided by the present invention in a pressing test state.

[0027] Legend: 1. PC transparent shell; 2. Yellow tube; 3. Compression spring; 4. Green tube; 5. Expansion seal; 6. Metal shell; 7. Metal ejector pin; 8. O-ring; 9. Schrader valve; 10. Valve core; 11. Valve installation gasket. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to relevant aspects, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a central element. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] Example

[0033] like Figure 1-3 As shown, the core operation of the valve cap for displaying tire pressure using a push-button mechanism is a pressing action. When the user applies external force to the valve cap, a metal pin 7 located within the metal housing 6 moves downward along a predetermined path under the pressure. Because the position of the metal pin 7 corresponds to the valve core 10, the downward movement of the metal pin 7 precisely lifts the valve core 10, causing the valve of the valve core 10 to open, thereby deflating the tire and enabling tire pressure measurement. After the pressing is completed, the compression spring 3 connected to the metal pin 7 plays a key role. During the pressing process, the compression spring 3 accumulates force as the metal pin 7 moves downward. When the external force is removed, the compression spring 3, leveraging its stored elastic potential energy, pushes the metal pin 7 in the opposite direction, causing it to rebound along its original path. Once the metal pin 7 returns to its original position, the valve core 10 is no longer subject to the external force and automatically closes due to its own elasticity or structural properties, returning to its original airtight state.

[0034] This design utilizes the principles of force transmission and elastic potential energy conversion within mechanical structures. When pressed, external force is transmitted to metal ejector pin 7, causing it to move and lift valve core 10, while simultaneously accumulating force in compression spring 3. After the press is complete, this spring's elastic potential energy is converted into force to push metal ejector pin 7 back into its original position, thereby resetting valve core 10. This mechanical linkage allows for the temporary opening of valve core 10 for deflation measurement and automatic restoration of airtightness upon completion. This avoids the problem of conventional tire pressure caps, where the ejector pin cannot be reset, leaving valve core 10 open for extended periods and resulting in poor airtightness.

[0035] The present invention fully considers the possibility of the valve cap rupturing during use. Two key sealing components are specifically designed: an O-ring and a valve mounting gasket 11. The O-ring fits tightly around the corresponding moving parts within the valve cap, providing a dynamic seal. This effectively prevents gas from leaking through these gaps during normal operation and relative movement of the valve cap's components. The valve mounting gasket 11, installed at the junction between the valve cap and the valve, ensures airtightness at this connection through its excellent sealing properties.

[0036] The O-ring utilizes its own elasticity and annular structure to fill the tiny gap in the sealing part when squeezed, forming a reliable sealing line of defense; the valve stem mounting gasket 11 relies on its material properties (such as good flexibility, fit, etc.) to fit tightly with the valve stem to prevent gas leakage.

[0037] The end of the metal ejector pin 7 is carefully designed as a conical structure, which plays an important role in the operation of the entire valve cap. When the pressing operation is performed, when the metal ejector pin 7 moves down to lift the valve core 10, the conical structure can accurately contact the triggering part of the valve core 10. Compared with other conventionally shaped ejector pin structures, the tip of the conical structure can more accurately locate the key position where the valve core 10 needs to be triggered, and due to its gradually tapering shape, when the same amount of pressing force is applied, the force can be more concentrated on the triggering point of the valve core 10, thereby triggering the opening and closing action of the valve core 10 more reliably and accurately. Whether it is the first time use or repeated operation, it can ensure that each time the metal ejector pin 7 is pressed, the valve core 10 can accurately open the valve to deflate as expected, and can smoothly close the valve after releasing it, ensuring that the entire tire pressure measurement operation is stable and accurate.

[0038] The tapered structure, based on the principle of pressure in mechanics, has a smaller tip area, generating greater pressure at the same pressure. This creates a more significant force on the trigger point of the valve core 10, making it easier to overcome the resistance of the valve core 10 and open or close it. Furthermore, the positioning precision provided by its shape further enhances operational accuracy and ensures the valve cap's reliable control of the valve core 10 when measuring tire pressure.

[0039] The expansion seal ring 5 used in the present invention is carefully selected and designed. It is made of high-temperature resistant rubber material and has special physical properties. When the valve cap is deflated to measure the tire pressure, as the gas flows from the valve core 10 into the interior of the valve cap, the gas pressure will act on the expansion seal ring 5. Since the expansion coefficient of the seal ring is linearly related to the change in tire pressure, this means that as the gas in the tire continues to flow into the valve cap, the gas pressure gradually increases, and the expansion seal ring 5 will expand according to a fixed linear law based on this pressure change. For example, when the tire pressure is sufficient, the corresponding gas pressure will cause the expansion seal ring 5 to expand to a certain extent, thereby lifting the green tube 4; when the tire pressure is insufficient, the gas pressure is small, the expansion degree of the expansion seal ring 5 is also correspondingly small, and the position of the green tube 4 will change accordingly.

[0040] Based on the principles of thermal expansion and contraction, as well as elastic deformation, high-temperature-resistant rubber materials undergo corresponding changes in their internal molecular structure when subjected to varying air pressures, resulting in a change in volume. Through material formulation and process control, a linear correlation is established between the degree of expansion and changes in tire pressure. This transforms the invisible pressure changes within the tire into visible changes in the expansion seal ring 5, which in turn provides a visual indication of the tire pressure status through interaction with the green cylinder 4.

[0041] The PC transparent shell is the external visible component of the entire valve cap. In order to ensure that it can maintain good performance in long-term outdoor use environments, its outer surface is provided with an anti-ultraviolet coating. This coating is evenly covered on the surface of the PC transparent shell. When the valve cap is exposed to sunlight, the ultraviolet rays will first irradiate the coating. The coating can absorb, reflect or scatter most of the ultraviolet rays, preventing the ultraviolet rays from directly penetrating the PC transparent shell, thereby reducing the damage of ultraviolet rays to the polymer material structure inside the PC transparent shell. With such protection, the PC transparent shell can delay the aging phenomenon caused by ultraviolet radiation, such as yellowing, brittleness, cracking, etc., and can improve its overall crack resistance, so that it can still maintain structural integrity and good transparency when facing various external force impacts, temperature changes and other factors in daily use, making it convenient for users to continuously observe the position changes of the green tube 4 and the yellow tube 2 through it to judge the tire pressure.

[0042] The UV protection coating material has a chemical structure that interacts with ultraviolet light. It absorbs the energy of ultraviolet light and converts it into other harmless forms (such as heat), or redirects the ultraviolet light through reflection and scattering, preventing it from damaging the base material of the PC transparent shell. This UV protection fundamentally slows the aging process of the material and ensures the durability and functionality of the PC transparent shell.

[0043] The inner wall of the metal shell 6 is provided with a guide groove structure, which is specially designed for the movement of the green tube 4 and the yellow tube 2. The green tube 4 and the yellow tube 2 need to accurately change their positions inside the valve cap according to the expansion of the expansion seal 5 to achieve a visual indication of the tire pressure status. The guide groove structure is like a track tailored for them, strictly limiting the movement path of the green tube 4 and the yellow tube 2. When the expansion seal 5 expands or contracts due to changes in tire pressure, it pushes the green tube 4 to move in the guide groove in a predetermined direction and range. The yellow tube 2 will also accurately appear covered or exposed in the corresponding position relationship under the constraints of the guide groove, ensuring that their position changes can accurately reflect the actual tire pressure in the tire, avoiding inaccurate position due to external interference or shaking of the components themselves, and thus causing misjudgment of tire pressure.

[0044] The guide groove structure utilizes the principle of mechanical limitation. By limiting the movement trajectory of the green tube 4 and the yellow tube 2 in space, they can only move on the path that meets the design requirements, ensuring the accuracy of their linkage with the expansion sealing ring 5 and the accuracy of the tire pressure display, making the entire visual indication system more stable and reliable.

[0045] Workflow Summary

[0046] Installation phase: First, install the valve mounting gasket 11 on the corresponding valve, and then install the entire valve cap to the valve through a suitable connection method (such as threaded connection, etc.), ensuring that the O-ring fits tightly to achieve good initial air tightness.

[0047] During tire pressure measurement, the user presses the top of the valve cap, forcing metal ejector pin 7 downward. Its tapered tip precisely lifts valve core 10, which opens and deflates air. This air enters the valve cap, compressing spring 3 and accumulating pressure. As air flows in, expansion seal 5 expands linearly with tire pressure, pushing green cylinder 4 within the confines of the guide grooves in the metal housing 6. The positional changes of green cylinder 4 and yellow cylinder 2 can be observed through the transparent PC housing to determine adequate tire pressure.

[0048] Reset phase: After pressing, compression spring 3 releases its stored force, pushing metal ejector pin 7 back to its original position. Valve core 10 automatically closes, and the valve cap returns to its initial position, ready for the next measurement. Throughout use, regardless of any unexpected circumstances, such as rupture of the valve cap, the O-ring and valve mounting gasket 11 maintain airtightness at the valve, ensuring stable tire pressure.

[0049] Through the coordinated work of the above components and the corresponding principle guarantees, the valve cap for pressing to display tire pressure of the present invention realizes convenient, accurate and reliable tire pressure measurement and display functions, while effectively solving the problems such as poor airtightness existing in the prior art, and providing a practical solution for non-motor vehicle tire maintenance.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A valve cap for displaying tire pressure by pressing, characterized in that: include: Metal casing (6); A metal ejector pin (7) is movably disposed in the metal housing (6) and is used to move downward when pressed to lift up the valve core (10) to open the valve and release air, and to return to its original position by rebounding after the pressure is released; A compression spring (3) connected to the metal ejector pin (7) and used to store force when pressed and drive the metal ejector pin (7) to reset after being released; An expansion seal ring (5) is arranged in the metal shell (6) and is linked with the valve core (10) to expand and lift up the green cylinder (4) when air is released; A green tube (4) and a yellow tube (2), wherein when the tire pressure is sufficient, the green tube (4) is lifted up by the expansion seal ring (5) to cover the yellow tube (2), thereby forming a visual indication of the tire pressure status; A PC transparent shell (1) covers the outside of the metal shell (6) and is used to observe the position changes of the green tube (4) and the yellow tube (2); The O-type dynamic sealing ring (8) and the valve nozzle mounting sealing pad (11) are used to ensure the air tightness between the valve cap and the valve nozzle.

2. The valve cap for displaying tire pressure by pressing according to claim 1, characterized in that: It also includes a valve core (10) and a Schrader valve (9), wherein the valve core (10) and the Schrader valve (9) are installed on a tire of a non-motor vehicle and are connected to the product for use.

3. The valve cap for displaying tire pressure by pressing according to claim 2, characterized in that: The valve cap temporarily lifts up the valve core (10) through a pressing operation to measure tire pressure, and the valve core (10) automatically returns to its original position and closes after the pressing is released.

4. The valve cap for displaying tire pressure by pressing according to claim 3, characterized in that: The end of the metal ejector pin (7) is provided with a conical structure for accurately triggering the opening and closing action of the valve core (10).

5. The valve cap for displaying tire pressure by pressing according to claim 4, characterized in that: The expansion seal ring (5) is made of high temperature resistant rubber material, and its expansion coefficient is linearly related to the change of tire pressure.

6. The valve cap for displaying tire pressure by pressing according to claim 5, characterized in that: The outer surface of the PC transparent shell (1) is provided with an anti-ultraviolet coating for delaying aging and improving anti-cracking performance.

7. The valve cap for displaying tire pressure by pressing according to claim 6, characterized in that: The inner wall of the metal shell (6) is provided with a guide groove structure for limiting the moving paths of the green cylinder (4) and the yellow cylinder (2).

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