JP2011126387A - Method of filling tire with gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of filling gas which allows a bead section of a tire to be appropriately adhered to a rim, thereby surely exhibiting tire performance according to the performance assumed when designing the tire. <P>SOLUTION: In the method of filling the gas outputted from a gas supply source through a gas supply passage, the gas outputted from the gas supply source is vibrated by admitting the gas into a vibration generating means installed in the gas supply passage, and is filled into the tire as vibrated gas. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for filling a tire with a gas such as air, and more particularly to a tire gas filling method for filling a tire with a vibrating gas.

In general, the bead seating pressure when an automobile tire is mounted on a wheel is set, for example, as 300 kPa. The bead seating is a state in which a pair of bead portions positioned in the tire width direction are evenly ridden along a tire circumferential direction in an area called a bead seat in a wheel rim (a rim with a bump is a state in which a bead exceeds a bump) It means that.
FIG. 13A is a cross-sectional view showing the behavior of the bead portion B before and after bead seating. Immediately after the tire 3 is fitted into the wheel rim R, the bead portion B is positioned inside the rim flange R2. In addition, when the tire 3 is filled with air, the bead portion B bends outward (Z direction) by the internal pressure, and presses and slides on the surface of the bead sheet R1 to adhere to the surface of the rim flange R2. And the tire 3 can be expanded to predetermined pressure by pumping air further.
However, in the conventional air filling method, even if air is filled according to the set pressure determined for each tire, the tip of the bead part B and the bead sheet are caused by the frictional force generated between the bead sheet R1 and the bead part B. There is a possibility that the surface is caught between the surfaces, and a gap g as shown in FIG. 13B is generated between the bead portion B and the rim flange R2, and the outer peripheral surface of the bead portion B is sufficient for the rim flange R2. There is a problem that the tire 3 may not be in close contact, and the tire 3 may be sufficiently distorted so that the performance of the tire 3 assumed at the time of designing the tire, that is, steering stability, riding comfort, braking / driving performance, and the like cannot be sufficiently exhibited. .
Further, it is conceivable to prevent catching by applying potash soap or the like to the surface of bead sheet R1, but the applied potash soap is easily removed by the contact pressure between bead portion B and bead sheet R1. Therefore, it is difficult to say that the frictional force cannot be reduced and the generation of the gap g can be effectively removed.

JP 2008-207688 A

  The present invention has been made in view of the above problems, and a tire having a tire bead performance, straight running performance, steering performance, braking / driving performance, etc. should be provided by properly adhering the tire bead portion to the rim. Provided is a gas filling method capable of reliably exhibiting various performances as designed by a tire.

In order to solve the above problems, as a first embodiment according to the present invention, a method of filling a tire with a gas output from a gas supply source via a gas supply flow path, the gas output from the gas supply source being The tire is filled as a vibrating gas that is caused to flow and vibrate into a vibration generating means provided in a gas supply channel.
ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to make it fit in the state which contact | adhered the bead part of the tire with respect to the bead seat | sheet and the rim flange, and it becomes possible to exhibit tire performance reliably as a tire design.
As a second aspect of the present invention, the vibration gas is filled before the tire bead portion comes into contact with the rim flange of the rim that holds the internal pressure of the tire.
According to the present invention, since the vibration gas is filled before the tire bead portion comes into contact with the rim flange of the rim that holds the internal pressure of the tire, it can be moved to the rim flange side while vibrating the bead portion, It becomes possible to make it adhere | attach to a bead seat and a rim flange more reliably.
Further, as a third embodiment according to the present invention, the vibration gas is filled in a state where the bead portion of the tire is in contact with the bead sheet of the rim that holds the internal pressure of the tire, so that the vibration air does not leak to the outside. The bead portion can be moved to the rim flange side while reliably applying vibration, and can be more reliably brought into close contact with the bead seat and the rim flange.
Further, as a fourth embodiment according to the present invention, the vibration gas is filled after a certain amount of gas is filled in the tire.
According to the present invention, since the tire is filled with the vibration air in a state where a certain amount of gas is filled, in addition to the effects resulting from the invention, the bead portion can be securely attached to the bead seat and the rim flange with a small amount of vibration air. It becomes possible to make it contact | adhere.
Moreover, as a fifth embodiment according to the present invention, the vibration gas is filled in the tire alternately with the normal gas.
Also according to the present invention, the bead portion of the tire can be brought into close contact with the bead seat and the rim flange as described above.
In addition, in this specification, gas means air, nitrogen, or these mixed gas.
The summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

The schematic block diagram which shows a gas filling apparatus and the gas filling method. The perspective view which shows a vibration generation means. The perspective view and sectional drawing which show the state which sends vibration air from a vibration generation means to a tire. Sectional drawing which shows the relationship between a tire and a rim | limb. The perspective view which shows a rim assembly machine. Sectional drawing which shows the state which assembled | attached the tire to the rim | limb. The figure showing the pressure fluctuation of vibration air. The figure showing the feeling evaluation in a comparative example. The figure showing the feeling evaluation in a comparative example. Sectional drawing (other forms) of a vibration generation means. The schematic block diagram (other form) which shows a gas filling apparatus and the gas filling method. The figure showing the pressure fluctuation of vibration air (other forms). The elements on larger scale which show the difference at the time of the assembly | attachment of the bead part by this invention and the conventional method.

Embodiment 1
FIG. 1 is a schematic block diagram of a gas filling apparatus A in which a tire gas filling method according to the present invention is employed. In the figure, the gas filling apparatus A mainly includes an air pressure setting means 1 and an air supply source 2. The air supply source 2 is, for example, an air compressor, and the air output from the air supply source 2 is filled into the tire 3 via a valve V provided in an air flow path 11 and a rim 31 described later. The air pressure setting means 1 includes a keyboard 1a, a display unit 1b for displaying a set pressure, completion of air filling, and the like.

8 is a pressure regulator, and this pressure regulator 8 adjusts the pressure so that the output pressure becomes constant even if the pressure (input) supplied from the air supply source 2 side fluctuates. A structure is adopted in which the output pressure is automatically controlled by a regulating valve that is detected by the diaphragm and linked to the diaphragm.
Reference numeral 4 denotes a direction switching valve. By controlling the direction switching valve 4 to open and close, a predetermined pressure of air can be supplied to the tire 3. The direction switching valve 4 is controlled by the control device 5, and when the start button provided in the air pressure setting means 1 is pressed, the initial pressure of the tire 3 before the air is supplied by the CPU of the control device 5 is not shown. It is read from a measuring device such as a sensor and is filled with air until the tire internal pressure becomes a set pressure compared with a preset set pressure of the tire.

  A vibration generator 9 is a feature of the present application. The vibration generator 9 is inserted into an air flow path 11 that connects the direction switching valve 4 and the tire 3. In this example, the air flow path 11 is constituted by a pressure-resistant tube capable of supplying air pumped from the air supply source 2, and includes the air supply source 2, the regulator 8, the regulator 8, the direction switching valve 4, and the direction switching valve 4. The flow path connecting the air vibration generator 9 and the air vibration generator 9 is also constituted by a pressure resistant tube. The air supplied from the air supply source 2 is converted into vibration air by the air vibration generator 9 and then filled into the tire 3 via the valve V.

2 and 3 are an exploded perspective view and a cross-sectional view showing the vibration generator 9, in which the vibration generator 9 is inserted into a cylindrical body 12 having both ends opened and a central portion of the cylindrical body 12. And a washer 14 having a throttle hole 13 serving as a passage hole for air flowing in from the upstream side, and a collar 16 and a collar 18 sandwiching the washer 14 from the upstream side and the downstream side. The collars 16 and 18 have holes 15 and 17 having a diameter larger than that of the throttle hole 13, and a plurality of layers are stacked in the extending direction of the cylindrical body 12 to constitute the color stacked portions 19 and 20.
As shown in FIG. 3 (a), the pressure-resistant tube forming the air flow path 11 has insertion ports 11m and 11n at the tip, the insertion port 11m is inserted into the inlet opening 23a, and 11n is an outlet described later. It is inserted into the opening 24a. In addition, 23m is an O-ring.

Ring-shaped lids 23 and 24 are attached to the upstream opening 21 and the downstream opening 22 of the cylindrical body 12. The lid bodies 23, 24 have screw holes 27, 28, and male screws corresponding to the screw holes 27, 28 are screwed into both ends of the cylindrical body 12, so that the lid bodies 23, 24 are opened to the upstream side opening 21 and It fits into the downstream opening 22.
When the lids 23 and 24 are fitted into the cylinder 12, the ends of the lids 23 and 24 sandwich the collar laminated portions 19 and 20 from both sides, and the washer 14 is sandwiched by the color laminated portions 19 and 20. It becomes a state. In this state where the washer 14, the color laminate portion 19, and the color laminate portion 20 are inserted, the washer 14 and the color laminate portions 19 and 20 are arranged along the extending direction of the cylindrical body 12. The throttle hole 13 is positioned so that the central axes of the holes 15 and 17 of the collars 16 and 18 coincide.
As an example of specifications, the outer diameters 25 and 26 of the lid bodies 23 and 24 are 61 mm, the inner diameter of the lid bodies 23 and 24 is 17 mm, the inner diameter of the collars 16 and 18 is 17 mm, and the inner diameter of the washer 14 is 3 mm (5 mm or 10 mm). The width (thickness) of the washer 14 and the collars 16 and 18 is set to about 2.5 mm.
Then, as shown in FIGS. 3A and 3B, the inlets 11m and 11n of the pressure-resistant tubes are respectively provided in the inlet opening 23a opened in the lid 23 and the outlet opening 24a opened in the lid 24. When the air is connected and air is pumped from the air supply source 2, the air flowing into the vibration generating space formed by the lid bodies 23 and 24, the color laminated portions 19 and 20, and the washer 14 becomes a hole in the color laminated portion 19. 15, turbulent flow is generated in the process of passing through the throttle hole 13 of the washer 14 and the hole 17 of the collar stacking portion 20, and air vibration K is generated that periodically repeats pressure fluctuations around the set pressure Ka as shown in FIG. To do.

That is, the compressed air 11 a that has entered from the inlet opening 23 a of the lid 23 is once throttled by the hole 15 of the collar 16, further throttled by the throttle hole 13 of the washer 14, and then released by the hole 17 of the collar 18. After that, since it is further opened at the outlet opening 24a of the lid 24, a periodic vortex as shown by an arrow in FIG. 3B is generated in the compressed air 11a, and an air vibration K is generated.
It should be noted that the vibration frequency of the air vibration K has various dimensions and positions such as the size relationship between the diameters of the throttle holes 13 and 15 or the size relationship between the diameters of the throttle holes 13 and 17 and the center axis of each hole being offset. Since it depends on the relationship, a desired vibration frequency can be obtained by appropriately setting various dimensions. Further, the vibration generator 9 is not limited to the above configuration, and may be a diaphragm type vibration generator.
FIG. 10 is a cross-sectional view showing another form of the vibration generator 9, and the vibration generator 9 in this embodiment is a form in which a washer 14 and a collar 18 are additionally provided. The frequency can be obtained.

That is, normal air output from the air supply source 2 is converted into vibration air having a predetermined vibration frequency by the vibration generator 9 interposed in the air flow path 11, and output from the outlet opening 24a to the tire 3 side. Is done.
As described above, since the air vibration generator 9 can generate air vibration by the combination of the washer 14 and the collars 16 and 18, vibration can be generated in the air with a simple configuration.

Hereinafter, the procedure in the case of filling the tire 3 with air using the gas filling apparatus A having the above configuration will be described.
First, as shown in FIG. 4, the tire 3 is pressed downward so as to cover the rim 31 so that the entire circumference of the lower bead portion Bm is brought into contact with the surface of the lower bead sheet R1. Next, the upper bead portion Bn is brought into contact with the surface of the upper bead sheet R1 using the rim assembly machine 30 shown in FIG.
Specifically, the range from the bead portion Ba to the bead portion Bb, which is a part of the bead portion Bn, is dropped along the rim edge R3 of the rim 31, and the tip of the lever 33 of the rim assembly machine 30 is moved to the bead portion Bn. By inserting between the dropped part and the rim flange R2 and rotating along the circumferential direction of the tire 3, after gradually dropping the entire circumference of the bead part Bn along the rim edge part R3, the lever 33 is removed and The entire circumference of the bead portion Bn is brought into contact with the surface of the upper bead sheet R1.
6, when the tire 3 is assembled to the rim 31 by the rim assembling machine 30, the bead portions Bm and Bn of the tire 3 are in contact with the upper and lower bead sheets R1 of the rim 31 and are filled. The vibration air can be held. Then, after removing the cap attached to the valve V and inserting the tip of the pressure-resistant tube into the valve V, the predetermined pressure of the filling air is set by the air pressure setting means 1, and the direction switching valve 4 is controlled by the control device 5. By controlling, the tire 3 can be filled with vibration air having a predetermined vibration frequency.

Hereinafter, the behavior of the bead portions Bm and Bn when the vibration air is filled in the tire 3 will be described. When the tire 3 is filled with vibration air, the internal pressure holding surface of the tire 3 vibrates while causing fine contraction and expansion by the vibration air.
Further, the bead portions Bm and Bn slide on the bead sheet R1 in the direction of the rim flange R2 while causing fine contraction and expansion by vibration air, and as shown by the phantom lines in FIG. 6, the bead portions Bm and Bn The outer peripheral surface is surrounded by the bead seat R1 and the rim flange R2 without causing a gap, and stops in a state of being in close contact with the bead seat R1 and the rim flange R2.
As a mechanism that the gap is not generated when the vibration air is filled, it is considered that the action of hitting the peripheral surfaces of the bead portions Bm and Bn repeatedly from the inside to the outside occurs when the vibration air is filled. Even if friction occurs between the sheet R1 and the bead part B, the bead sheet R1 can be smoothly slid to the rim flange R2 side without being caught, and the bead parts Bm and Bn can be rim flanged without causing a gap. It is thought that it can be pressed against the R2 side.
And since the gap does not occur, the tire performance assumed at the time of design can be surely exhibited. The reason for this is that, as shown in FIG. 13 (b), conventionally, the tire assembled on the wheel is often in contact with the bead seat R 1 and the rim flange R 2 on the rim edge R 3 side. Since the wall is assembled in the state of extending in the width direction of the wheel, if the load acts on the tire, the side wall must be supported in the radial direction and bent Rather, the load is supported substantially depending on the air pressure.
On the other hand, as shown in FIG. 13 (a), in the tire supplied with air by the method according to the present invention, the bead portions Bm and Bn are in close contact with the rim flange R2, so that the sidewalls are stretched in the width direction of the wheel. It does not come out, stands up with respect to the rim, supports the load acting on the tire almost linearly without bending the sidewall, and loads in a state close to the ideal tire shape assumed at the time of design Therefore, it is considered that a favorable evaluation was obtained in the feeling test described later.

As shown in FIG. 1, reference numeral 7 denotes a direction switching valve for extracting air. Under the control of the control device 5, the direction switching valve 7 is controlled to release air. The air venting operation is performed, for example, by once removing the air of a tire filled with normal air, then lowering the internal pressure of the tire and then refilling the vibration air again, thereby re-adhering the beads Bm and Bn to the rim flange R2 side. This is done when fitting.
For example, even in the case of a tire mounted on a rim with a gap generated by normal air, the tire is filled with a certain amount of gas without going through the work of removing the bead part from the bead seat. If the original internal pressure is restored by filling the vibration air corresponding to the extracted amount, the gap that has already been generated can be efficiently eliminated with a small amount of vibration air filling, and the bead portion can be reliably removed. It becomes possible to make it contact | adhere with respect to a rim flange.

≪Comparative example≫
Hereinafter, the overall feeling of maneuverability and ride comfort in the case of “tires filled with compressed air and fitted to the rim” and “tires filled with vibration air and fitted to the rim” The evaluation will be described.
The “normal compressed air” in this case is a case where air is directly filled from the air compressor without using the air vibration generator 9.
Comparative Example 1
The tire was 205 / 55R16, radial tire, internal pressure: 230 kPa, and the results are shown in FIG. As shown in the figure, tires fitted with normal air have a worse feeling score when the toe angle of the vehicle decreases, whereas tires fitted with vibration air have been found to have less deterioration in feeling score. did. On the other hand, it was confirmed that the tire fitted with vibration air is robust with respect to the alignment of the vehicle (low performance degradation).
Also, when examining the alignment of a total of 144 models currently on the market, there are 141 models with a front toe angle of 20 minutes or less, accounting for 98% of the total. In other words, tires fitted with vibration air are desired to have superior performance even in many vehicles because the performance is less when the toe angle of the vehicle is smaller.

Comparative Example 2
In order to confirm the universality of oscillating pneumatic tires, a comprehensive feeling evaluation of maneuverability and ride comfort was performed in three vehicle types with different vehicle sizes.
The tires are initially mounted tires, and the internal pressure: vehicle recommended internal pressure is shown in FIG. As shown in the figure, in three vehicle types with different vehicle sizes, it was confirmed that the tires fitted with vibration air compared to the tires fitted with normal compressed air improved the feeling score, and the vehicles were different. Even in such a case, the effect of improving the performance of the tire supplied with the internal pressure by the vibration air was confirmed.

Embodiment 2
FIG. 11 shows another embodiment of the gas filling method according to the present invention. In the above embodiment, as shown in FIG. 7, it has been described that the vibration air is filled from the start time t0 of the vibration air until the internal pressure in the tire 3 reaches a predetermined pressure. However, as shown in FIG. 9 is provided with a bypass 9a, and the air flow path 11 from the direction switching valve 4 side can be switched between the vibration generator 9 and the bypass 9a by the direction switching valve 9q. As shown in FIG. Until time t2 before the air reaches a predetermined pressure or until time t1 before t2 as shown in FIG. 12B, normal air is pumped through the bypass 9a, and vibrations occur at times t2 and t1. The air flow path 11 may be switched to the generator 9 so that air is used as vibration air, and the vibration air may be filled until the tire 3 reaches a predetermined pressure.
Alternatively, as shown in FIG. 12C, the bypass 9a and the vibration generator 9 may be alternately switched by the direction switching valve 9q to perform normal air filling and vibration air filling alternately.

1 air pressure setting means, 2 air supply source, 3 tires, 4 direction switching valve,
9 vibration generator, 11 air flow path, 11a pressurized air, 12 cylinder, 13 throttle hole,
14 washers, 15, 17 holes, 16, 18 collars, 23, 24 lids,
F Pressure direction, V valve.

Claims (5)

A method of filling a tire with gas output from a gas supply source via a gas supply channel,
A tire gas filling method comprising filling a tire with a vibration gas that is caused to flow by vibrating a gas output from the gas supply source into vibration generation means provided in the gas supply flow path.   2. The tire gas filling method according to claim 1, wherein the vibration gas is filled before a bead portion of the tire abuts against a rim flange of a rim that maintains an internal pressure of the tire.   2. The tire gas filling method according to claim 1, wherein the vibration gas is filled in a state in which a bead portion of the tire is in contact with a bead sheet of a rim that maintains an internal pressure of the tire.   The tire gas filling method according to any one of claims 1 to 3, wherein the vibration gas is filled after the tire is filled with a certain amount of gas.   The tire gas filling method according to any one of claims 1 to 4, wherein the vibration gas is filled into the tire alternately with a normal gas.

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