JP2008006883A - Valve and sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve sealing performance at an attaching portion of a valve attached to a hole formed at a wheel. <P>SOLUTION: In the valve attached to the hole 6b formed at the wheel 6 to which a tire 4 is mounted, a pressure keeping portion 10 can keep the pressure of an inside area 8 surrounded by the tire 4 and the wheel 6 higher than the outside portion, and lead in gas from the outside into the inside area 8. A suction portion 12 is formed outside the pressure keeping portion 10, and sucked to the inner surface 6c of the wheel 6 opposite to the inside area 8 to seal a clearance between the hole 6b and the inside area 8. Therefore, the suction portion 12 is pressed to the inner surface 6c of the wheel by a pressure difference, and can seal the clearance between the hole 6b and the inside area 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique of a valve attached to a wheel.

2. Description of the Related Art Conventionally, wheels used in vehicles are equipped with an air valve for maintaining tire air pressure and filling air as necessary. In recent years, in order to further improve safety, a device for wirelessly transmitting tire air pressure information to a vehicle body has been devised. As such a device, Patent Document 1 discloses a detection device in which an information detection unit for detecting information in a tire and a valve are integrated and attached to a wheel.
JP 2002-46433 A

  By the way, since the valve is normally attached to the wheel, if the sealing performance at the valve attachment portion is insufficient, the air pressure in the tire gradually decreases.

  This invention is made | formed in view of such a condition, The place made into the objective is to provide the technique which improves the sealing performance in the attaching part of the valve | bulb attached to the hole formed in the wheel.

  In order to solve the above problems, a valve according to an aspect of the present invention is a valve attached to a hole formed in a wheel on which a tire is mounted, and is a pressure in an inner region surrounded by the tire and the wheel. Is maintained higher than the outside, and a pressure maintaining unit capable of introducing gas from the outside into the internal region, and is provided outside the pressure maintaining unit, and is adsorbed on the inner surface of the wheel facing the internal region. And an adsorbing part that seals between the hole and the internal region.

  According to this aspect, with the valve attached to the wheel, the pressure in the inner region is made higher than the outside of the tire, so that the adsorbing part is pressed against the inner surface of the wheel due to the pressure difference, and between the hole and the inner region. Can be sealed. The higher the pressure in the inner region, the greater the force that is applied to the inner surface of the wheel, so that the sealing performance between the inner region and the hole that is the valve mounting portion can be improved. . Here, the suction part may be, for example, a suction cup shape.

  You may further provide the press-fit part which press-fits in the said hole part, and seals between an internal area | region and the exterior. Thereby, the valve | bulb can seal between the exterior and internal area | region of a wheel, when the inner periphery of a hole and the press-fit part closely_contact | adhere. Therefore, sealing can be performed at a plurality of locations of the suction portion and the press-fitting portion, and the sealing performance can be further improved. Further, since the valve is supported by the hole, the entire valve is difficult to tilt. Therefore, for example, even if some force is applied to the portion of the pressure maintaining portion of the valve that protrudes to the outside of the wheel, it is difficult for the force to be transmitted to the adsorption portion, and the sealing performance in the adsorption portion can be prevented from deteriorating. . On the other hand, even if some force is applied to the part of the pressure maintaining part of the valve that protrudes outside the wheel, the suction part is in surface contact with the inner surface to support the pressure maintaining part. The inclination is suppressed, and the deterioration of the sealing performance at the press-fit portion can be suppressed.

  The adsorbing part may have a concave part formed on the side in contact with the inner surface, and an end part on the side of the concave part may have an elastic part extending forward in the press-fitting direction from at least a part of the press-fitting part. Thereby, the end surface of the suction portion is pressed against the inner surface of the wheel by setting the pressure of the concave portion to a negative pressure from the inner region, so that the sealing between the inner region and the hole can be performed firmly. In addition, since the suction part has an elastic part whose end face on the concave side extends forward from at least a part of the press-fitting part in the press-fitting direction, the elastic part is inserted into the hole part before the press-fitting part is pressed into the hole part. Contact the inner surface. In this state, when the suction part is further pressed in the press-fitting direction and the press-fitting part is pressed into the hole part, the elastic part is deformed, so that the gas in the concave part is discharged into the internal area and the pressure in the concave part is negative with respect to the internal area. It becomes. As a result, the sealing between the inner region and the hole by the suction portion can be more reliably performed by the pressing force due to the deformation of the elastic portion and the pressure difference between the concave portion and the inner region.

  Another aspect of the present invention is a sealing structure. This sealing structure is a sealing structure for sealing an inner region surrounded by a tire and a wheel on which the tire is mounted, and includes a hole formed in the wheel and a valve mounted in the hole. And comprising. The valve is provided outside the pressure maintaining unit, a pressure maintaining unit capable of maintaining the pressure in the internal region higher than the outside and introducing gas from the outside into the internal region, An adsorbing portion that adsorbs to the inner surface of the opposing wheel and seals between the hole and the internal region, a press-fitting portion that is press-fitted into the hole and seals between the internal region and the outside, Have The pressure in the sealing region formed between the adsorption portion and the press-fitting portion is lower than the pressure in the internal region.

  According to this aspect, with the valve attached to the wheel, the pressure in the inner region is made higher than the outside of the tire, so that the adsorbing part is pressed against the inner surface of the wheel due to the pressure difference between the hole and the inner region. It can be sealed. The higher the pressure in the inner area, the greater the force that is applied to the inner surface of the wheel. Therefore, even if the pressure is high, the sealing between the inner area and the hole that is the mounting part of the valve The performance can be improved. Moreover, the valve | bulb can seal between the exterior and internal area | region of a wheel, when the inner periphery of a hole and the press-fit part closely_contact | adhere. Therefore, sealing can be performed at a plurality of locations of the suction portion and the press-fitting portion, and the sealing performance can be further improved. Further, since the valve is supported by the hole, the entire valve is difficult to tilt. Therefore, for example, even if some force is applied to the portion of the pressure maintaining portion of the valve that protrudes to the outside of the wheel, it is difficult for the force to be transmitted to the adsorption portion, and the sealing performance in the adsorption portion can be prevented from deteriorating. . On the other hand, even if some force is applied to the part of the pressure maintaining part of the valve that protrudes outside the wheel, the suction part is in surface contact with the inner surface to support the pressure maintaining part. The inclination is suppressed, and the deterioration of the sealing performance at the press-fit portion can be suppressed.

  Here, the press-fit portion may be, for example, an annular groove that is similar to the shape of the inner periphery of the hole and has a slightly larger outer shape than the inner periphery of the hole. More preferably, the shapes of the inner periphery of the hole and the outer periphery of the press-fit portion are each circular. Moreover, you may form a press-fit part with an elastic body. Then, the press-fit portion can be brought into close contact with the inner periphery of the hole portion by press-fitting into the hole portion while deforming the press-fit portion and utilizing the restoring force of the elastic body. Moreover, it can prevent that the press-fitted part press-fitted remove | deviates from a hole part by making locations other than a press-fitting part into the outer peripheral shape larger than a press-fitting part. Further, the press-fitting direction is preferably a direction passing through the hole and going from the inner region side of the wheel toward the outside of the wheel. Thereby, workability | operativity at the time of attaching a valve | bulb to a wheel can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing performance in the attaching part of the valve | bulb attached to the hole formed in the wheel can be improved.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate.

(First embodiment)
FIG. 1 is a cross-sectional view schematically showing a main part of a wheel to which a valve according to a first embodiment is attached. As shown in FIG. 1, the valve 2 according to the present embodiment is attached to a hole 6b formed so as to penetrate the rim 6a of the wheel 6 on which the tire 4 is mounted from the inside of the wheel toward the outside. ing.

  FIG. 2 is an overall side view of the valve 2 shown in FIG. The valve 2 maintains a pressure in the inner region 8 surrounded by the tire 4 and the wheel 6 higher than the outside of the wheel 6, and a pressure maintaining unit 10 that can introduce gas into the inner region 8 from the outside, and a pressure An adsorbing portion 12 that is provided outside the maintaining portion 10 and adsorbs to the inner surface 6 c of the wheel 6 that faces the internal region 8 and seals between the hole 6 b and the internal region 8. For example, the pressure maintaining unit 10 is provided with a check valve. In the normal state, this check valve is closed by the pressure in the internal region that is higher than the outside air, and can maintain the pressure in the internal region 8.

  The suction part 12 is pressed against the inner surface 6 c of the wheel 6 by the pressure difference by increasing the pressure in the inner region 8 from the outside of the tire 4 with the valve 2 attached to the wheel 6. As a result, the suction part 12 can seal between the hole 6b and the internal region 8. By providing such a suction portion 12 on the valve 2, it is possible to easily attach the valve 2 in comparison with a case where the valve is mounted in a screw hole formed in the wheel. Moreover, since the force pressed against the inner surface 6c of the wheel 6 increases as the pressure in the inner region 8 increases, the sealing performance between the hole 6b to which the valve 2 is attached and the inner region 8 is improved. Can do.

  FIG. 3 is a cross-sectional view of the main part of the sealing structure in the vicinity of the hole 6b of the wheel 6 shown in FIG. A mounting method for attaching the valve 2 to the wheel 6 will be described with reference to FIG.

  The valve 2 includes a press-fit portion 14 that is press-fitted into the hole 6b and seals between the inner region 8 and the outside, and a cap 16 that is attached to the tip of the valve 2 so that foreign matter does not enter the pressure maintaining portion 10. In addition. Then, as shown in FIG. 3, the valve 2 is pushed into the hole 6 b of the wheel 6 in the press-fitting direction A from the inner region 8 toward the outside of the wheel 6. Thereby, workability | operativity at the time of attaching a valve | bulb to a wheel can be improved. After the cap 16 passes through the hole 6b, the valve 2 passes through the hole 6b while the tapered portion 18 whose diameter increases from the cap 16 to the press-fit portion 14 is deformed. Finally, the press-fitting portion 14 of the valve 2 is press-fitted into the hole 6b while being deformed, and is brought into close contact with the inner periphery of the hole 6b by the restoring force of the elastic body. The gap can be sealed.

  The press-fitting portion 14 of the valve 2 according to the present embodiment is a circular annular groove that is similar in shape to the inner periphery of the hole 6b and has an outer peripheral shape slightly larger than the inner periphery of the hole 6b. Moreover, the press-fit portion 14 and the taper portion 18 can be made compatible with both mounting properties and sealing properties by being formed of an elastic body such as rubber or resin. Moreover, since the outer diameter of the area | region adjacent to the press-fit part 14 is larger than the outer diameter of the press-fit part 14, the taper part 18 can prevent the press-fit press-fit part 14 from coming off from the hole 6b.

  Next, a process in which the suction portion 12 is attracted to the inner surface 6c in the mounting method of the above-described valve 2 will be described. As shown in FIGS. 2 and 3, the suction portion 12 according to the present embodiment has an umbrella-like structure in which a recess 12 a is formed on the side in contact with the inner surface 6 c of the wheel 6. Further, the end surface on the concave portion 12a side has an elastic portion 12b extending forward in the press-fitting direction A from at least a part of the press-fit portion 14. Therefore, when the valve 2 is press-fitted into the hole 6b, the elastic part 12b comes into contact with the inner surface 6c of the wheel 6 before the aforementioned press-fitting part 14 is press-fitted into the hole 6b.

  In this state, when the suction portion 12 is further pressed in the press-fitting direction A and the press-fit portion 14 is press-fitted into the hole 6b, the elastic portion 12b is deformed, so that the gas in the recess 12a is discharged to the inner region 8 and On the other hand, the pressure in the recess 12a becomes negative. As described above, by setting the pressure of the concave portion 12a to be a negative pressure from the inner region 8, the end surface of the adsorption portion 12 is pressed against the inner surface 6c of the wheel 6 due to the pressure difference, and between the inner region 8 and the hole 6b. Can be firmly sealed. In addition to the pressing force due to the pressure difference, the adsorbing portion 12 can more reliably perform the sealing between the inner region 8 and the hole 6b by the pressing force due to the deformation of the elastic portion 12b.

  The valve 2 attached to the hole 6b as described above further improves the sealing performance by sealing the inner region 8 at a plurality of locations of the suction portion 12 and the press-fit portion 14, and suppresses air leakage. Can do. Moreover, since the valve | bulb 2 is supported by the hole 6b, the whole valve | bulb becomes difficult to incline. That is, when the tire 4 rotates in the arrow B direction, even if the centrifugal force C is applied to the portion of the pressure maintaining portion 10 of the valve 2 that protrudes outside the wheel 6, the suction portion 12 comes into surface contact with the inner surface 6c. Since the pressure maintaining unit 10 is supported, it is possible to suppress a decrease in sealing performance due to the inclination of the entire valve in the press-fitting unit 14. On the other hand, even if some force is applied to the portion of the pressure maintaining portion 10 of the valve 2 that protrudes outside the wheel 6, the force is hardly transmitted to the adsorption portion 12 because the valve 2 is supported by the press-fit portion 14. It can suppress that the sealing performance in the adsorption | suction part 12 falls.

  The valve 2 according to the present embodiment can constitute a sealing structure with improved sealing performance by combining with the wheel 6 on which the tire 4 is mounted. This sealing structure is a structure that seals the inner region 8 surrounded by the tire 4 and the wheel 6 to which the tire 4 is mounted. And the hole 6b formed in the wheel 6 and the valve | bulb 2 with which the hole 6b was mounted | worn are provided. The valve 2 is provided outside the pressure maintaining unit 10, a pressure maintaining unit 10 capable of maintaining the pressure in the internal region 8 higher than the outside and introducing gas from the outside into the internal region 8. Is adsorbed on the inner surface 6c of the wheel 6 opposite to the suction portion 12 and seals between the hole 6b and the inner region 8, and press-fitted into the hole b to seal between the inner region 8 and the outside. Part 14. The pressure in the concave portion 12 a that is a sealing region formed between the suction portion 12 and the press-fitting portion 14 is lower than the pressure in the inner region 8. In this sealing structure, the suction portion 12 is pressed against the inner surface 6c of the wheel 6 due to the pressure difference by increasing the pressure in the inner region 8 from the outside of the tire 4 with the valve 2 attached to the wheel 6. The space between the portion 6b and the inner region 8 can be sealed.

(Second Embodiment)
In the present embodiment, a valve provided with a tire pressure monitoring system (hereinafter referred to as TPMS) and a sealing structure using the same will be described. FIG. 4 is a cross-sectional view of a main part of the sealing structure according to the second embodiment.

  The valve 20 according to the present embodiment is a snap-in type valve integrally provided with a TPMS 22. The TPMS 22 measures the air pressure and temperature of the tire 4 and transmits the information as a high-frequency wireless signal to a receiving device provided in the vehicle body. As shown in FIG. 4, the TPMS 22 occupies a relatively large volume in the main body of the valve 20. Therefore, when the tire 4 rotates in the arrow B direction, a large force is applied to the TPMS 22 in the outer circumferential direction D of the tire 4.

  Even in such a case, the valve 20 according to the present embodiment is sealed not only by the press-fit portion 14 but also by the suction portion 12, and the pressure of the recess 12a is negative with respect to the internal region 8. By setting the pressure, the end surface of the suction portion 12 is pressed against the inner surface 6c of the wheel 6 due to the pressure difference, and the sealing between the inner region 8 and the hole portion 6b can be performed firmly.

  For example, when an external force in the direction of arrow E is applied to the tip of the valve 2, a moment M is generated in the suction portion 12 c of the suction portion 12 in a direction away from the inner surface 6 c with the press-fit portion 14 as a fulcrum. However, as described above, the suction portion 12 is pressed against the inner surface 6c by the pressure difference between the concave portion 12a and the inner region 8, and thus the suction portion 12 is difficult to move. Therefore, the force applied to the press-fit portion 14 can be reduced, and air leakage from the press-fit portion 14 can be suppressed.

  Even if an external force is applied in the direction of the arrow F parallel to the press-fitting direction of the valve 2, a reaction force is generated in the entire suction portion 12, so that the suction portion 12 hardly moves and the sealing in the suction portion 12 is performed. Performance does not decrease.

  According to this embodiment, even when a valve integrated with an accessory such as TPMS is attached to the wheel, the suction portion is pressed against the inner surface of the wheel by the pressure difference, so that the hole portion and the inner region And the air leakage from the tire can be suppressed.

  As described above, the present invention has been described with reference to the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and the configurations of the embodiments are appropriately combined or replaced. Those are also included in the present invention.

It is sectional drawing which showed typically the principal part of the wheel with which the valve | bulb which concerns on 1st Embodiment was attached. It is a whole side view of the valve | bulb shown in FIG. It is principal part sectional drawing of the sealing structure of the hole vicinity vicinity of the wheel shown in FIG. It is principal part sectional drawing of the sealing structure which concerns on 2nd Embodiment.

Explanation of symbols

  2 valve, 4 tire, 6 wheel, 6a rim, 6b hole, 6c inner surface, 8 inner region, 10 pressure maintaining part, 12 adsorption part, 12a recess, 12b elastic part, 12c adsorption part, 14 press-in part, 16 cap, 18 Taper, 20 Valve, 22 TPMS.

Claims (4)

A valve attached to a hole formed in a wheel to which a tire is attached,
While maintaining the pressure in the inner region surrounded by the tire and the wheel higher than the outside, a pressure maintaining unit capable of introducing gas from the outside into the inner region;
An adsorption part that is provided outside the pressure maintaining part, adsorbs to the inner surface of the wheel facing the internal area, and seals between the hole and the internal area;
A valve comprising:   The valve according to claim 1, further comprising a press-fitting portion that is press-fitted into the hole and seals between the inner region and the outside.   The suction part has a concave part formed on a side in contact with the inner surface, and an end part on the side of the concave part has an elastic part extending forward in the press-fitting direction from at least a part of the press-fitting part. 2. The valve according to 2. A sealing structure for sealing an inner region surrounded by a tire and a wheel on which the tire is mounted,
A hole formed in the wheel;
A valve mounted in the hole,
The valve is
While maintaining the pressure of the internal region higher than the outside, a pressure maintaining unit capable of introducing gas from the outside into the internal region;
An adsorption part that is provided outside the pressure maintaining part, adsorbs to the inner surface of the wheel facing the internal area, and seals between the hole and the internal area;
A press-fit portion that is press-fitted into the hole and seals between the inner region and the outside,
The sealing structure, wherein a pressure in a sealing region formed between the suction portion and the press-fitting portion is lower than a pressure in the inner region.

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