JP2006321447A - Valve protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage to a valve when a safety tire of double structure is rim-assembled. <P>SOLUTION: When a tube 24 is mounted to the rim 40, the valve protector 10 is mounted to the valve 20. Thereby, a male screw 22 of the valve 20 can be protected and when it is inserted to a valve hole 42, the male screw 22 of the valve 20 is not damaged. A nut can be easily and certainly fixed to the valve 20 inserted into the valve hole 42. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a valve protector and a rim assembling method, and more particularly, to a valve protector and a rim assembling method for preventing a tube valve from being damaged when assembling a rim of a dual structure safety tire.

  A double-structured safety tire (run-flat tire) has been proposed that enables safe driving even when the internal pressure is reduced abnormally, such as when the tire is punctured.

  A general dual-structure safety tire has a tube (inner gas chamber) filled with a high-pressure gas inside the tire, and the tube expands during tire puncture so that the tire can be supported from the inner surface side. .

When assembling the tire on the rim, the valve of the tube is pulled by a drawer jig and the valve is inserted into the valve hole of the rim.
WO2004 / 109168

  However, pulling the valve with a drawer jig may damage the valve threads.

  If the valve threads are damaged, the nut will not fit when the valve is secured to the rim. Further, even if the nut is fitted, the screw thread of the valve is damaged, so that it is difficult to remove the nut (it rotates between the valve and the tube), and there is a problem that it cannot be recycled.

  Furthermore, after passing the valve through the valve hole of the rim with the drawer jig, if the drawer jig is separated from the valve, the valve may be pulled out of the valve hole, or it is difficult to fit the nut if the drawer jig is still attached. was there.

  The present invention has been made to solve the above problem, and a first object of the present invention is to provide a valve protector capable of preventing damage to the valve.

  A second object is to provide a rim assembling method that is excellent in workability while preventing damage to the valve.

  The invention according to claim 1 is a valve protector used when a valve provided on a tube is attached to a valve hole of a rim, and a portion that contacts a fixing means for fixing the valve to the valve hole. And a first engagement portion formed on the protection portion for engaging the protection portion with the valve.

  Next, the operation of the valve protector according to claim 1 will be described.

  When the tube is attached to the rim, the valve protector is engaged with the valve at the first engagement portion.

  As a result, the protection part protects the part where the fixing means for fixing the valve contacts, so that the valve is not damaged when inserted into the valve hole, and the fixing means can be easily and reliably attached to the valve inserted into the valve hole. Can be fixed to.

  Moreover, it becomes easy to remove also when removing a fixing means.

  According to a second aspect of the present invention, in the valve protector according to the first aspect, the first engaging portion is a female screw that is screwed into a male screw of the valve.

  Next, the operation of the valve protector according to claim 2 will be described.

  The valve protector can be easily attached to the valve by screwing the female screw with the male screw of the valve. Also, the valve protector can be easily removed.

  According to a third aspect of the present invention, in the valve protector according to the first or second aspect, the protective portion engages with a drawer jig for pulling out the valve from the valve hole. It has the part.

  Next, the operation of the valve protector according to claim 3 will be described.

  The valve can be easily pulled out from the valve hole by engaging and pulling the drawer jig with the second engagement of the valve protector.

  According to a fourth aspect of the present invention, in the valve protector according to any one of the first to fourth aspects, the protective portion is made of stainless steel.

  Next, the operation of the valve protector according to claim 4 will be described.

  In the valve protector according to the fourth aspect, since the protective portion is made of stainless steel, rust is not generated, it is harder to break than plastic and the durability is excellent.

  The invention according to claim 5 is a rim assembling method for assembling a tube to a rim using the valve protector according to any one of claims 1 to 4, wherein the valve protector is engaged with the valve. A first step, a second step of pulling out the valve engaged with the valve protector from the valve hole, a valve protector pulled out of the valve hole, and a fixing means for the valve pulled out of the valve hole. And a third step of attaching.

  Next, the operation of the fifth aspect of the invention will be described.

  First, in the first step, the valve protector is engaged with the valve.

  In the second step, the valve engaged with the valve protector is pulled out from the valve hole of the rim.

  In the third step, the valve protector drawn out from the valve hole is removed, and a fixing means is attached to the valve drawn out from the valve hole. Thereby, the valve is fixed to the rim.

  According to a sixth aspect of the present invention, in the rim assembling method according to the fifth aspect of the present invention, in the third step, before the valve protector is removed, a temporary stopper is used to prevent the valve from moving. The temporary fixing by the stopper is released after the fixing means is attached.

  Next, the operation of the sixth aspect of the invention will be described.

  If the valve pulls out from the valve hole and then returns to the valve hole, the valve will not move before removing the valve protector attached to the valve from the valve hole. Temporarily fix the valve using a stopper.

  Thereby, after removing a valve protector, a fixing means can be attached easily.

  As described above, according to the valve protector of the present invention, there is an excellent effect that it is possible to prevent damage to the valve when assembling the rim of the double structure safety tire.

  Moreover, according to the valve protector of this invention, it has the outstanding effect that a valve can be efficiently attached to a rim.

Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
(Configuration of valve protector)
As shown in FIG. 1, the valve protector 10 of the present embodiment has a cylindrical shape, and on the inner peripheral surface, a first female screw 12 that engages with the male screw 22 of the valve 20 and a male screw of the jig 30. A second female screw 14 that is threadedly engaged with the screw 32 is formed.

  The valve protector 10 is preferably formed of a metal material having excellent wear resistance and corrosion resistance. The valve protector 10 of this embodiment is formed from stainless steel.

  Further, when the valve protector 10 is made of stainless steel, it is preferable that the valve protector 10 has a thickness t of at least 0.5 mm.

  Here, the thickness t is the thickness of the thinnest portion, and in the valve protector 10 of the present embodiment, is the distance between the outer circumferential surface and the valley of the first female screw 12.

Further, since the valve protector 10 allows the valve hole 42 of the rim 40 to be inserted, the outer diameter is set smaller than the inner diameter of the valve hole 42 (see FIG. 2).
(Configuration of stopper)
FIG. 3 shows a stopper 50 that presses the valve 20 when the rim is assembled.

  The stopper 50 is formed by bending a metal plate, and a groove 52 is formed on the tip side.

The width W of the groove 52 is set to be smaller than the outer diameter of the male screw 22 of the valve 20 and larger than the valley diameter, and can enter the valley portion of the male screw 22 from the direction perpendicular to the axis of the valve 20.
(Function)
Next, the operation of the valve protector 10 of this embodiment will be described.

  For example, when assembling a rim of a safety tire having a double structure, as shown in FIG. 2, the first female screw 12 of the valve protector 10 is screwed into the male screw 22 of the valve 20 of the tube 24 to attach the valve protector 10. Attach to valve 20.

  Next, the drawer jig 30 is inserted into the valve hole 42, the male screw 32 formed at the tip of the drawer jig 30 is screwed into the second female screw 14 of the valve protector 10, and the valve 20 is moved together with the valve protector 10. Pull out.

  At this time, the valve protector 10 prevents the male screw 22 of the valve 20 from coming into contact with the valve hole 42 and being damaged.

  After pulling out the valve 20, a stopper 50 is inserted into the gap between the valve protector 10 and the rim 40 as shown in FIG. 3A, and the stopper 50 is hooked on the thread of the male screw 22 of the valve 20. The valve 20 is held so as not to be pulled into the valve hole 42.

  Then, the valve protector 10 is removed from the valve 20 while the valve 20 is pressed by the stopper 50, and the nut 26 is screwed into the valve 20 as shown in FIG.

  If the nut 26 is screwed into the valve 20, the valve 20 will not be pulled into the valve hole 42, so the stopper 50 is removed and the nut 26 is tightened to the end as shown in FIG. Fix it.

Since the valve protector 10 prevents the male screw 22 of the valve 20 from being damaged, the nut 26 can be easily screwed and can be recycled.
(Test example)
In order to confirm the effect of the present invention, the valve failure rate and the working efficiency were compared with and without using the valve protector.

  Conventional example: A safety tire (pneumatic tire + tube) having a double structure was assembled without using a valve protector.

  Example: A safety tire having a double structure was assembled using a valve protector. The material of the valve protector was stainless steel.

  Valve failure rate: When a nut is attached to a failed tube valve (a thread is damaged) when a rim is actually assembled, and a force exceeding the limit (7.5 N · mm) that allows a person to tighten with a tool is required Considered a failure. 30 rims were assembled in both the conventional example and the example. The evaluation is expressed as an index with the valve failure rate of the conventional example being 100, and the smaller the numerical value, the smaller the valve failure.

  Working efficiency: The working time of the rim assembly was measured, and the working time of the conventional example was set as 100 and evaluated by an index. The smaller the index value, the better the work efficiency.

  In the rim used in the test, the diameter of the valve hole through which the valve was inserted was 20.5 mm.

  Moreover, the diameter of the male thread part of the valve | bulb of the tube used for the test was 17.8 mm.

試験の結果、バルブ穴とバルブ保護具の径差が０．２ｍｍ未満になると、バルブ穴にバルブ保護具を通し難くなり、作業性が悪化する。

As a result of the test, when the diameter difference between the valve hole and the valve protector is less than 0.2 mm, it becomes difficult to pass the valve protector through the valve hole, and the workability deteriorates.

  When the thickness of the valve protector is 0.3 mm or less, the strength of the valve protector is insufficient, and the valve protector may be cracked or the valve thread may be damaged.

It is sectional drawing of a valve protector. It is a side view of the valve periphery which shows the state which has pulled out the valve with the drawer jig. (A) is a side view of the periphery of the valve showing a state where the valve is pressed by the stopper, and (B) is a plan view of the vicinity of the tip of the stopper. It is a side view of the valve periphery which shows the state which applied the nut. It is a side view of the valve periphery which shows the state which fixed the valve | bulb to the rim with the nut.

Explanation of symbols

10 Valve protector 50 Stopper

Claims (6)

A valve protector used when attaching a valve provided on a tube to a valve hole of a rim,
A protective portion that covers a portion that contacts a fixing means for fixing the valve to the valve hole; a first engaging portion that is formed in the protective portion and engages the protective portion with the valve;
A valve protector comprising:   2. The valve protector according to claim 1, wherein the first engagement portion is an internal thread that is screwed into an external thread of the valve.   3. The valve protector according to claim 1, wherein the protector includes a second engagement portion that engages with a drawer jig for pulling out the valve from the valve hole. 4.   The valve protector according to any one of claims 1 to 4, wherein the protection portion is formed of stainless steel. A rim assembling method for assembling a tube to a rim using the valve protector according to any one of claims 1 to 4,
A first step of engaging the valve protector with the valve;
A second step of pulling out the valve engaged with the valve protector from the valve hole;
A third step of removing the valve protector drawn from the valve hole and attaching a fixing means to the valve drawn from the valve hole;
A rim assembling method characterized by comprising:   In the third step, before removing the valve protector, it is temporarily fixed using a stopper so that the valve does not move, and after the fixing means is attached, the temporary fixing by the stopper is released. The rim assembly method according to claim 5.

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