RU172323U1 - Tire nipple (tire valve) with integrated autonomous inflation - Google Patents

Abstract

The invention relates to systems for pumping and monitoring the pressure in the car tires while driving and can be used in tubeless tires as the main device and in the chamber tires as nozzles on the nipple on the wheel. The technical result of the claimed invention consists in providing the possibility of pumping the car tires with help of a universal design that does not have a direct connection with the tire and works due to short-term pressure changes caused by the passage of various irregularities. The result is achieved through the use of a piston in the design, which limits the volume located in the nipple and which creates a higher pressure in this volume than in the tire, which leads to the valve opening and additional air entering the tire. In this case, the piston operates with short-term increases in tire pressure during the passage of irregularities. Also, to enhance the effect of pressure on the piston, as well as to increase the technical result, a special design can be used to increase the forces attributable to the piston from the side of the tire.

Description

The utility model relates to systems for pumping and monitoring the pressure in the tires of the car while driving and can be used in tubeless tires as the main device and in the chamber tires as a nozzle on the existing nipple on the wheel.

The prior art patent application RU 93028567, the purpose of which is to simplify the design of the nipple and increase its reliability. In this case, the nipple includes a nut, a nut bushing with an elastic sealing ring and a check valve, the sealing ring is made in the form of a glass with an opening in the bottom, the outer surface of the bottom is made in the form of a check valve seat, the check valve head is made by cold heading.

The differences of the claimed solution are that the nipple with built-in inflation has a closed internal volume limited by a piston and two valves and is able not only to provide the possibility of inflation of the tire, but also to inflate the tire independently while driving.

Patent FR 2831486 is known which describes an improved nipple with a sensor for monitoring tire pressure. In this case, the sensor is located inside the wheel rim and is structurally connected with the valve of the nipple.

The differences of the claimed solution consist in the fact that the nipple with inflation is able not only to mechanically monitor the pressure drop in the tire, but also to automatically start to pump pressure to the required value, due to the installed spring-loaded piston, which lowers and unloads the spring when the pressure drops, which creates the working volume used by the piston during short-term pressure surges in the tire during movement.

Known patent KR 101244423 describing a nipple with a built-in automatic control valve. This design allows you to set the exact pressure in the tire, as the valve pushes excess pressure back into the atmosphere.

The differences in the claimed solution consist in the fact that the nipple with pumping is not intended for bleeding, but for pumping the tire with air and increasing pressure in the event of a drop, which is ensured by the operation of the piston and compression of the air in a closed volume.

Known patent RU 2106978, describing a method of inflation of tires using located in the body of the tire tube, limited by a valve on one side and a pressure limiter on the other. In this case, the tire is inflated by squeezing the tube at the place where the wheel contacts the road surface, which causes the air blocked in the tube to tend to the valve and enter the tire. Such a solution may be ineffective in case of damage to the wheel at the location of the tube.

The differences of the claimed solution are that the wheel pumping system is located in the design of the nipple, which is located on the rim and its damage is unlikely. At the same time, the principle of operation of the nipple with inflation is to find a spring-loaded piston inside the nipple, which lowers and unclenches the spring when the pressure drops, which creates the working volume used by the piston during short-term pressure surges in the tire during movement.

The closest solution is GB1457404, which describes a tire inflation method using a pump design located inside the tire on the wheel rim. The pump consists of two telescopic cylinders that move towards each other pumping air when the part of the tire (in which the pump is located) is in contact with the road surface.

The differences of the claimed solution are that:

- the wheel swap design is located inside the nipple, which is located in the most protected part of the wheel;

- the built-in swap on the nipple works, not from the contact of the wheel with the road, but from the change in air pressure in the tire when the wheel passes rough roads (potholes, patches, waves of asphalt, etc.).

The technical result of the claimed utility model is to provide the ability to inflate the tires of the car using a universal design that does not have a direct connection with the tire and works due to short-term pressure changes due to the passage of various irregularities.

The technical result is achieved through the use of a piston in the design, which limits the volume located in the nipple and which creates a pressure in this volume higher than in the tire, which leads to the opening of the valve and additional air to the tire. In this case, the piston operates with short-term increases in tire pressure during the passage of irregularities. Also, to enhance the effect of pressure on the piston, as well as to increase the technical result, a special design can be used to increase the forces attributable to the piston from the side of the tire.

Brief Description of the Drawings:

FIG. 1 - 3D image of the nipple with pumping with a cut; FIG. 2 - Sectional view of the swappable nipple; FIG. 3 - image of the piston; FIG. 4 - A possible design of a pressure amplifier, which is an auxiliary device; FIG. 5 - Possible design of the amplifier, which is the only element acting on the piston.

The tire nipple (tire valve) with built-in automatic autonomous inflation consists of the following elements (according to the drawings):

Directly nipple:

1. Nipple body;

2. Step piston;

3. The valve is a membrane (has a hole in the center and is designed for easy air flow into the closed over-piston volume);

4. The main spring;

5. The ball of the second valve;

6. The second valve (designed to let air into the tire when the pressure in the above-piston space exceeds the pressure in the tire);

7. Valve spring;

8. Fastener (designed to support the design of the second valve inside the piston);

9. O-rings;

10. Air duct (for air passage to the membrane valve);

11. Spool valve (for manual pumping);

12. The lower part of the body;

13. Nut (for fixing to the wheel rim)

14. The cap of the nipple is a special shape (to reduce the likelihood of moisture and dirt);

15. Intake air ducts;

16. Working air channels (for air to enter directly into the tire);

17. The upper diameter of the piston;

18. The piston stage with a transition diameter;

19. A groove for the installation of o-rings;

20. The lower diameter of the piston.

Pressure booster (possible design):

21. The housing of the amplifier;

22. The drive piston of the amplifier (with a small hole for the gradual equalization of pressure inside and outside the amplifier);

23. Lever;

24. The spring;

25. Liquid piston;

26. fluid;

27. Working emphasis;

28. Fixing eye (for attaching directly to the nipple on the back of the wheel rim);

29. Circlip;

30. The pins;

31. Elastic cone;

Direct pressure amplifier (possible design):

32. Rod with a piston;

33. Bypass valve;

34. Closed volume;

35. Inlet valve;

36. Air intake to the tire;

37. Atmospheric air, atmospheric pressure.

The work of the nipple itself is constructed as follows:

When the car wheel is hit by an unevenness inside the tire, pressure rises abruptly, which, through the working air channel (16), presses on the step piston (2) from below. In order to compensate for the increased pressure, the piston is forced to move upward by compressing the main spring (4), increasing the pressure in the supra-piston space and pressing the valve-membrane (3) against the upper part of the supra-piston space using increased pressure.

At the same time, the piston stage (18) is connected to the atmosphere by means of air channels (15) and does not create additional resistance to the movement of the piston, and since the upper diameter of the piston (17) is larger than the lower diameter of the piston (20), the compensating pressure in the above-piston space should be greater than increased tire pressure.

When the pressure in the above-piston space begins to exceed the pressure in the tire, a second valve (6) sealed by a ball (5) opens, which allows air to enter the tire through the working air channels (16) and equalize the pressure.

After unevenness travels, the tire pressure decreases, the second valve (6) closes with the help of the valve spring (7) and the piston (2) with the main spring (4) drops to the position corresponding to the tire pressure. When the piston is lowered, the pressure in the above-piston space decreases until a vacuum occurs, which leads to the deformation of the valve-membrane (3) in the central part and the possibility of atmospheric air passing through the air channels (15) into the above-piston space. Next, the cycle repeats.

Design Features:

1. In the nipple housing, it is possible to install a separate spool valve (11) designed for manual inflation of the tire. At the same time, air entering through the spool valve will create pressure in the above-piston space, which will lead to the opening of the second valve (6) and air to the tire.

2. The design of the second valve is installed in the piston by means of a fastening element (8), and the piston itself is sealed by means of o-rings (9).

3. The nipple cap (14) has an inlet for atmospheric air only on one side, in order to avoid unnecessary swirls of air and accumulation of dirt. At the same time, a closed space is provided in the cap into which the ball element can be placed to create microvibrations that destroy the accumulated dirt.

4. The operation of the piston (2) is possible only if the tire has a minimum working pressure determined by the main spring (4). Depending on the pressure in the tire, the pressure force and the amount of compression of the main spring, the location of the piston inside the nipple body (1) and the volume of the over-piston space are different. In this case, when the maximum pressure in the tire is reached, the piston (2) reaches its upper point at which the spring (4) is fully compressed, and the piston volume is absent. Further inflation and pumping of the tire is not possible.

5. After each work of the piston (2), atmospheric pressure is created in the above-piston space. At the same time, the volume of the over-piston space is important. So, with a maximum volume, the piston stroke by 1 mm will increase the pressure in the above-piston space (conditionally) by 10%, if the tire is half-inflated and the piston is in the middle position, then reducing the volume by 1 mm will increase the pressure in the above-piston space by 20%. Thus, despite the fact that atmospheric pressure is created in the above-piston space after the working cycle, the piston with each subsequent working cycle is able to create more pressure than in the tire due to the gradual reduction of the above-piston space as the tire is inflated. That is, the pressure in the tire, increasing, moves the piston up, reducing the over-piston volume and creating opportunities for further inflation.

6. The main spring (4) returns the piston (2) to the working position after each working cycle, but it should be noted that the spring due to its own elasticity creates additional resistance to the piston, which translates into a loss of approximately 50% efficiency.

Example of calculating the operation of the nipple:

Under conditional values of the main spring (4):

Maximum deormation - 40 N;

Maximum working stroke - 9 mm.

The lower diameter of the piston is 16 mm;

The maximum volume of the over-piston space is 716 mm ³

If the wheel has a pressure of 1.2 atmospheres (0.12 MPa) then a force of 24.13 N falls on the lower part of the piston, which leads to compression of the spring by 5.43 mm to 3.57 mm of stroke and a decrease in volume to 431.93 mm ³ . We will consider these values to be the main ones for calculating our example of the operation of the nipple.

Assume that the wheel runs into roughness of the road, as a result of which the pressure inside the wheel increases sharply by 0.27 atmospheres (0.017 MPa) to 0.147 atmospheres (0.147 MPa), and the pressure force on the piston increases by 5.43 N to 29.56 N, which leads to further compression of the spring by 1.22 mm and a reduction in the above-piston closed volume to 284.32 mm ³ , and the pressure in the above-piston space rises from unity to 1.52 atm (0.152 MPa). As you can see, the pressure in the closed volume at a certain point in time exceeded the pressure in the tire, and it became possible to pump the tire.

As can be seen from the example, in order for the pressure in the above-piston space to become higher than in the tire, a sufficiently strong increase in pressure in the tire is necessary. The reason for this is the work of the spring, without which the design will not work at all. Pumping at lower pressure surges in the tire can be achieved using springs capable of accumulating pressure during compression, which will increase the piston stroke during pressure surges, or you can install any design of the pressure amplifier on the piston on the nipple.

The work of the alleged pressure amplifier is constructed as follows:

When the tire hits a roughness, the tire rises in pressure, which acts not only on the nipple piston, but also on the amplifier piston (22), which presses the lever (23), which has a liquid piston (25) on the other hand, which in turn presses on the fluid (26) which moves the working stop (27), which in turn abuts against the piston of the nipple, which moves at a greater distance and, accordingly, the pressure in the above-piston space increases more.

A feature of such an amplifier is:

- The presence of a piston spring, which is designed to return the piston (22) to its original state;

- The piston (22) has a small hole designed to gradually equalize the pressure on the outside and inside the amplifier (which eliminates the spring of high elasticity).

- The design provides for a cap made of elastic material (31), intended for pressure squeezing, which will increase the fluid pressure (26) and move the stop (27) into working condition (the stop should be in contact with the nipple piston).

An example of a nipple with an amplifier:

The diameter of the nipple piston is 16 mm;

The piston diameter of the amplifier is 30 mm;

The volume of the nadpore nadporshne space is 716 mm ³ ;

The stroke of the nipple piston spring is 9 mm.

The spring force is 40 N.

Distance from central lever mount to:

The main piston - 18 mm;

Liquid piston - 12 mm.

Conditional initial indicators:

Pressure - 0.12MPa;

Spring length at a pressure of 3.57 mm;

The volume of the over-piston space at a pressure of 431.93 mm ³ .

Suppose that when bumping over a bump, the pressure increases by only 0.005 MPa, which equals a force of 1.005 Newtons per nipple piston and 3.53 N per amplifier piston.

At the same time, since the lever is used in the amplifier, the force on the liquid piston will be 5.3 N. This force is transmitted through the liquid to the stop and then to the nipple piston.

The total force on the piston of the nipple is equal in this case 6,305 N.

The piston will move 1.42 mm to 2.15 mm, and the volume will be reduced to 260.13 mm ³ . The pressure in the above-piston space in this case will increase to 0.166 MPa.

It is also possible to use amplifiers of other designs that can be installed on the nipple from the outside, and can be built into the design of the nipple.

Claims (2)

1. Nipple - a valve of a car tire with built-in automatic self-inflation, comprising a housing in which a spring-loaded piston and valves limiting the over-piston space are located, characterized in that said piston is stepwise and spring-loaded with a main spring, which presses the valve-membrane to the upper end part of the over-piston space, with one of the sides of the larger stage, the piston is connected to the atmosphere, in addition, a valve is provided in the piston cavity for inlet air in the tire when the pressure in the above-piston space exceeds the pressure in the tire with an abrupt increase in pressure inside. 2. Nipple - the valve of a car tire according to claim 1, characterized in that it is equipped with a working amplifier.

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