JPS60236810A - Air valve for tyre - Google Patents

Abstract

PURPOSE:To facilitate a work to mount and demount a tyre to and from a rim and to improve durability, by a method wherein an air valve for truck tyre is constituted such that a valve stem, in which a seal is engagedly interposed, is interposed into a valve sleeve, and is fastened by means of a nut threadedly attached to the outer periphery of the sleeve. CONSTITUTION:A valve stem 35, with which packing rings 40 and 42 are engaged, is inserted into an insertion hole 30 of a valve sleeve 33 having a large flange 31 which is buried in base rubber 32, and a nut 44 is threadedly joined with the valve sleeve 33. This causes the sleeve 33, the stem 35, and the nut 44 to be forced into contact with each other, the stem 35 is fixed, and a shoulder part 38 is forcibly pressed in with the aid of a projection part 44b of the nut 44, and is sealed by means of a packing ring 40. This constitution facilitates mounting and demounting of the tyre to and from the rim during rotation, prevents deterioration in a packing, and eliminates specification of tightening torque, resulting in easy handling.

Description

TECHNICAL FIELD The present invention relates to improvements in tire air valves, particularly tube air valves suitable for trucks.

(Prior Art) As shown in Fig. 1+a), a tube air valve for a truck that has been put into practical use has a lower part of a valve stem 1 buried in a base rubber 2, and the base rubber 2
Since the valve stem 1 is integrated with the tube rubber 3, when a tire with a tube attached is assembled on a rim, the valve opening direction of the valve stem 1 is fixed, so it is difficult to change the tire position for tire low-tension adjustment. When the tire/chi 1. - There is a problem in that each time a set of tubes is reattached to the rim, it is necessary to replace the tubes.

In contrast, as shown in FIG. 1(b), the applicant provided a valve sleeve 10 with a tapered surface 16 on the upper edge of the inner circumference, and rotated the insertion body 12 of the valve stem 11 into the valve sleeve IO. Insert the valve sleeve 1 (H: tighten the nut 14 into the valve stem 1) so that its shoulder 13 is separated from the upper end of the valve sleeve 10 by a slight gap α.
1 and the tapered surface 16 with the backing ring 15 fitted to the lower corner of the shoulder 13 of the valve stem 11, or in addition to this configuration, A backing ring 17 fitted to the insertion body 12 seals between it and the inner peripheral surface of the valve sleeve 10, so that the direction of the valve stem can be freely changed. (Special 54-64764).

This structure is similar to the conventional so-called universal tie valve and swivel valve (both of which can change the stem upward direction).
It has the excellent advantage of having a good sealing effect and no loss of strength, but when changing the tire position for a tire low-take of 9. As shown, remove the tire 21 and tube 22 set from the rim 20 (insert the valve stem 23 into the rim's valve hole 2).
4, and as shown in FIGS. 2c and 2d, turn the rim 20 180 degrees
After rotating the valve port by 180 degrees, remove the valve stem 2 in order to reinstall the tire 21 and tube 22 on the rim 20.
3 into the valve hole 24 of the rim and pull it out of the rim 20 (in either case, press the tire lever etc. against the valve opening of the valve stem 23) Since the valve stem 23 is free to rotate, it constantly wobbles and is often pushed in. This poses a problem of difficulty and poor workability. In addition, with the structure described in item 1 above, problems may occur due to the free rotation of the valve stem during use (the backing ring may deteriorate due to heat conduction due to the stem coming into contact with the rim window or brake drum), and furthermore, there is a risk that the valve stem may cause problems due to free rotation of the valve stem (backing ring deteriorates due to heat conduction). There is a problem in that the tightening torque of the nut 14 must be specified in advance in order to ensure α.

(Objective of the Invention) The present invention solves the above-mentioned conventional problems, improves workability when attaching and detaching the tire to the rim when changing the tire position for tire rotation, and reduces the deterioration of the backing ring built into the valve during use. The main object of the present invention is to provide an air valve for a tire that does not require a tightening torque specification when tightening a NAND.

(Structure of the Invention) In order to achieve the above object, the first aspect of the present invention includes a valve sleeve in which a lower large-diameter flange portion is embedded in a base rubber, and 1- an air passage hole that can be inserted into the valve sleeve. a valve stem having a body portion and a shoulder portion, the upper end of the valve sleeve coming into contact with the shoulder portion when the cough body portion is inserted into the valve sleeve; , with the lower end separated from the upper surface of the flange portion of the valve sleeve by a predetermined gap, the upper end protruding portion is provided with a nut for pressing and fixing the shoulder portion of the valve stem against the upper end of the valve sleeve, and tightening the nut. The main feature is that at least one backing ring is fitted between the body of the valve stem and the valve sleeve to seal the gap between the valve stem and the valve sleeve when the valve stem is inserted into the valve sleeve. In the second invention, the lower large-diameter flange is embedded in the base rubber, and
The valve sleeve has a tapered surface formed on the inner circumferential edge of the upper end, and a body portion and a shoulder portion having an air passage hole that can be inserted into the valve sleeve, and when the body portion is inserted into the valve sleeve. , the upper end of the valve stem is tightened into the outer peripheral male thread of the valve sleeve, and the upper end protrudes with the lower end being separated from the upper surface of the flange part of the valve sleeve by a predetermined gap. The part is provided with a nut that presses and fixes the shoulder of the valve stem against the upper end of the valve sleeve, and when the nut is tightened into the lower corner of the shoulder of the valve stem, the lower corner of the shoulder and the The main feature is that a banking ring is fitted which is sandwiched between the tapered surface of the valve sleeve and seals between the valve stem and the valve sleeve.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3, the tire air valve of the first invention includes a valve sleeve 33 having an insertion hole 30 and a lower large-diameter flange portion 31 embedded in a base rubber 32. A threaded portion 34 is provided on the outer peripheral surface.

The valve stem 35 is provided with an insertion body portion 37 having an air passage hole 36, and has a protruding shoulder portion 38 that comes into contact with the upper end of the valve sleeve 33 when the body portion 37 is inserted into the insertion hole 30 of the valve sleeve 33. do. Above shoulder part 3
A ring groove 39 is provided on the outer periphery near 8, and a backing ring 40 is fitted therein to seal between the body 37 of the valve stem and the valve sleeve 33. In addition to the power king ring 40, a ring groove 41 is provided on the outer periphery of the lower part of the insertion body 37 in the axial direction, into which a power king ring 42 is fitted, and the valve stem 35 is inserted into the ring groove 41. Torso 3
7 and the valve sleeve 33 may be double sealed. By using this double backing, the dimension A in Figure 3
The advantage of being able to reduce the machining accuracy of the part and dimension B part to some extent and double seal safety is obtained.

Next, a screw 44 having a female thread 43 that is screwed into the male threaded portion 34 of the valve sleeve 33 is externally fitted,
The nut 44 is tightened so that the lower end 44a is separated from the upper surface of the flange portion 31 of the valve sleeve 33 by a predetermined gap β, and the protruding portion 44b at the upper end is attached to the valve stem 35.
Attach the shoulder 38 of the valve stem 33 to the upper end of the valve sleeve 33 so that the valve stem 33 does not wobble (tightening torque example is 40 to 50).
kg).

A washer 46 such as a spring washer or a split washer is fitted into the gap β between the lower end 44a of the nut 44 and the upper surface of the flange portion 31 of the valve sleeve 33, and the nut 44
may be tightened against this washer 46. Due to the elasticity of this washer 46, the nut 44
This prevents the danger of the joint rotating with the stem 35 and prevents the throat from becoming loose.

The tire air valve of the second invention is the same as the first invention except for the following points.
The structure is almost the same as that of the invention. That is, in FIG.
A tapered surface 4 is formed on the inner peripheral edge of the upper end of the valve sleeve 33.
5, and the valve stem 35 is connected to the valve stem 35.
A packing ring 40 is fitted between the ring groove 39 provided on the outer periphery of the lower corner portion of the ring 40 to seal the gap with the tapered surface 45.

Other points are basically the same as the first invention. That is, the air valve has an insertion hole 30 and a lower large diameter flange portion 3.
1 was embedded in the base rubber 32. t<t A valve sleeve 33 is provided, and a threaded portion 34 is provided on the upper outer peripheral surface of the valve sleeve 33. The tit rev stem 35 is provided with an insertion body portion 37 having an air passage hole 36, and also includes a body portion 37! <) When inserted into the insertion hole 30 of the rev sleeve 33, a protruding shoulder portion 38 is provided which comes into contact with the upper end of the /ll jib 33.

In addition to the backing ring 40, a ring groove 41 may be provided on the outer periphery of the lower portion of the insertion body 37 in the axial direction, and a backing ring 42 may be fitted into the ring groove 41 for a 2'-fold seal.

Next, a nut 44 having a female thread 43 that is screwed into the male threaded portion 34 of the valve sleeve 33 is fitted onto the outside, and the nut 44 is tightened so that the lower end 44a is separated from the upper surface of the flange portion 31 of the valve sleeve by a predetermined gap. In this state, the protrusion 44b at the upper end presses the shoulder 38 of the valve stem 35 against the upper end of the valve sleeve 33 to the extent that the valve stem 35 does not wobble (example tightening torque: 40 to 50 kg).
Fixed to.

A washer 46 such as a spring washer or a split washer is fitted into the gap β between the lower end 44a of the 44 and the upper surface of the flange portion 31 of the valve sleeve 33, and the nut 44 is tightened against the washer 46. You can also do this. The resilience of this washer prevents the risk of the nut 44 co-rotating with the stem 35.

If the air valve is configured as described above, when the valve steno 35 fitted with the backing rings 40 and 42 is inserted into the insertion hole of the valve sleeve 33 and the nut 44 is screwed onto the valve sleeve 33, the valve sleeve 33 and the valve stem are connected. 35 and the nut 44 come into contact with each other, and the valve stem 35 is fixed, and the shoulder 38 of the valve stem 35 is pressed down by the protrusion 44b of the nut 44.
The backing ring 40 is located between the body 37 of the valve stem and the upper inner peripheral surface of the valve sleeve 33 or at the tapered surface 45.
The insertion body 37 of the valve stem is pressed between
The seal between the valve sleeve 33 and the valve sleeve 33 is doubled. Further, the elasticity of the washer 45 sufficiently prevents the nut 44 from loosening.

When rotating a tube and tire set that has an air valve structure as described above, after removing the tire/tube from the rim (Fig. 2b), rotate the rim 180° for reinstallation. When turning over the valve stem and changing the direction of the valve opening (Fig. 2 C), loosen the NAND L to allow the valve stem to rotate and change the direction 180°, then tighten the NAND again to remove the wobble. This fixes the valve stem to a certain degree. As described above, in the air valve of the present invention, the valve stem is made rotatable only when rotation of the valve stem is necessary during reinstallation for tire low-chip replacement, and is otherwise fixed with a nut.

(Effects of the Invention) As is clear from the above explanation, the valve stem of the air valve of the present invention is fixed so that it cannot rotate at all times except when it is particularly required. When attaching and detaching the tube cent to the rim,
There is no wobble when pushing the valve stem into the valve hole of the rim, making it easier to work, there is no problem of deterioration of the banking ring due to free rotation of the valve stem during use, and the center of the tire/tube is firmly attached to the rim. When installing, there is no need to specify the tightening torque of the NAND in advance, just tighten it with regular pliers to the extent that the valve steno does not wobble.Furthermore, by using a washer, you can prevent the Nand from loosening sufficiently. It has extremely excellent practical effects in that it can be prevented.

In addition, with the present invention, a reliable seal can be obtained by using one or two banking rings, and the valve stem can be rotated and the valve opening direction can be freely changed by loosening the nozzle, making it easy to change the tire position. Needless to say, this has the original effect of eliminating the need for tube replacement work.

It goes without saying that the basic configuration of the present invention can be applied to tubeless valves.

[Brief explanation of drawings]

1A and 1A are vertical sectional views showing a conventional air valve, FIG. 2A is a state in which the tire/tube is attached to the rim, and FIG. 2 is a state in which the tire/tube is removed from the rim. Figure 2C shows the rim with the rim turned inside out and the tire/tube /zH rubber stem rotated 180 degrees to change the valve opening direction. Figure 2d shows the rim and tire/tube in Figure 2C. A schematic cross-sectional view showing a combined state of the
FIG. 3 is a longitudinal cross-sectional view showing one embodiment of the air valve for a tire with a tube according to the present invention, and FIG. 4 is a longitudinal cross-sectional view showing another embodiment of the air valve for a tire with a tube according to the present invention. 31... Flange part of valve sleeve. 33... Valve sleeve. 35... Valve stem. 37...The body of the valve stem. 38...Shoulder of valve stem. 40...Backing ring. 45...Tapered surface. 46.--Washer. b ・ ゛°De°Isukul Patent Applicant Sumitomo Rubber Industries, Ltd. Figure 1 (0) Figure 1 (b) 1. Indication of the incident S No θ/Complete S Submitted on May 9, 1980 Patent application 2 Name of the invention Air valve for tires 6 Person making the amendment (voluntary) 5 Column for detailed explanation of the invention in the specification to be amended. Page 11, line 12 of the statement of contents of the 6 amendment [(Tightening torque example 40~
50kQ)] should be corrected to [(Tightening torque example: return torque is 40 to 50#fα)). Kazuo Wakasugi, Commissioner of the Japan Patent Office Patent application 2 filed on May 9, 1980 Name of the invention Tire air valve 6 Relationship with the case of the person making the amendment Patent applicant Figures 3 and 4 are attached as attached. I will correct it. Procedural amendment (voluntary) June 1, 1980 Director General of the Patent Office Kazuo Wakasugi 2. Name of the invention Air valve for tires 3. Person making the amendment (voluntary) 5. Details of the invention in the specification to be amended Description field. 6. Page 9, line 14 of the statement of contents of the amendment “(Tightening torque example 40-50
kf) J is "(Tightening torque example, return torque is 4.
0~50 kgf+cm)) Correct to J. Lines 1 and 2 of page 10 of the specification, "The danger of joint rotation of the gutter 44 with the wall stem 35 is prevented. The loosening of the gutter 44 is eliminated.".'' Page 11 of the specification, lines 19-20 ``Su'7) 44 power (
The risk of co-rotation with the stem 35 is prevented. " is corrected by δ1 to "Loosening of the nut 44 is prevented." Written amendment to the above procedure (October 308, 1981, own ship 1, Indication of the case 1982 Patent Application No. 93465 2, Name of the invention Air valve for tires 3, Person making the amendment Relationship to the case Patent applicant address Kobe City 5, 1-1-1 Tsutsui-cho, Chuo-ku, I will add the following to the detailed description of the invention and the brief description of the drawings in the specification subject to amendment. The flange portion 31 of the valve sleeve 33 has a polygonal cross section, such as a hexagonal shape (FIG. 6), or a Q-shape (FIG. 7) having at least a pair of mutually parallel plane portions, and the spanner 50 engages with the flange portion 31 of the valve sleeve 33. At the same time, the outer circumferential surface 44C of the nut 44 is
The spanner 50 has a polygonal cross section, for example, a hexagonal shape (FIG. 8).
The cross-sectional distance FD of the stepped portion 48 of the flange portion 31 of the valve sleeve 33 is formed such that the nut 44 can be engaged with the nut 44.
It is particularly desirable to design the FD and ND to be equal to or greater than the cross-sectional distance Nu).For example, FD = 14 m,
Make the amount the same, such as ND = 14 amount. The height SH of the stepped portion is, for example, 5M. Further, the height NH of the nut is somewhat lower than the conventional height due to the relationship with the step portion 48. In addition, when attaching a valve to the valve tube 5l having the stepped portion 48 having the cross-sectional shape shown in FIG. It is necessary to install them so that they are aligned. With the above configuration, when fixing the valve stem 35 to the valve sleeve 33 with the nut 44, a nozzle spanner is engaged with the stepped portion 48 to prevent the valve sleeve 33 from wobbling and fixed in advance, and the nut 44 is also tightened. ．． The nut 44 can be tightened by engaging the spanner, and the work of fixing the valve stem 35 to the nut can be done easily and quickly. (2) Figures 5 to 9 will be added as shown in the attached sheet. (3) Add the following to the brief explanation column of the drawing. Fig. 5 is a vertical sectional view of a valve with a stepped part for tightening with a wrench according to the present invention, Fig. 6 is a sectional view taken along line X-X of the stepped part in Fig. 5, and Fig. 7 is a longitudinal sectional view of the stepped part in Fig. 5. FIG. 8 is a sectional view taken along the line X-X of another embodiment, FIG. 8 is a cross-sectional view taken along the Y-Y line of the polygonal nut of the present invention, and FIG. FIG. Figure 7 above

Claims (1)

[Scope of Claims] (11) A valve sleeve having a lower large-diameter flange portion embedded in a base rubber, and a body portion and a shoulder portion having an air passage hole that can be inserted into the valve sleeve; When the valve stem is inserted into the valve sleeve, the upper end and shoulder of the valve sleeve come into contact with each other, and the outer thread of the valve sleeve is tightened so that the lower end is at a predetermined gap with the upper surface of the flange part of the valve sleeve. In the separated state, the upper end protrusion is provided with a nand that presses and fixes the shoulder of the valve stem against the upper end of the valve sleeve, and when the nut is tightened, the body of the valve stem and the valve sleeve are A tire air valve characterized by fitting at least one banking ring sandwiched between the valve stem and the valve sleeve to seal between the valve stem and the valve sleeve. (2) The lower end of the nand and the upper surface of the flange portion of the valve sleeve. An air valve for a tire according to claim 1, in which a washer is fitted in the gap.(3) The valve has a lower large diameter flange part buried in the base rubber, and a tapered surface is formed on the inner peripheral edge of the upper end. The sleeve has a body portion having an air passage hole and a shoulder portion that can be inserted into the valve sleeve, and when the body portion is inserted into the valve sleeve, the upper end and shoulder portion of the valve sleeve are inserted into the valve sleeve. is in contact with the valve stem and the external male thread of the valve sleeve, and with the lower end separated from the upper surface of the flange portion of the valve sleeve by a predetermined gap, the upper end protrusion touches the shoulder of the valve stem. A Nand is provided to press and fix the upper end of the valve sleeve, and when the Nand is tightened into the lower corner of the shoulder of the valve stem, the Nand is sandwiched between the lower corner of the shoulder and the tapered surface of the valve sleeve. An air valve for a tire, characterized in that a backing ring is fitted to seal between the valve stem and the valve sleeve. (4) A washer is fitted into the gap between the lower end of the Nano 11 and the upper surface of the flange part of the valve sleeve. An air valve for a tire according to claim 3.