JP2002340247A - Joint seat for air tank and air tank having it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint seat for an air tank and an air tank having it, capable of preventing clogging of air devices, air leakage due to damage of a valve seat part and air leakage due to welding failure by surely inhibiting chipping caused by a male screw part of a counterpart member even if the joint seat is deformed due to thermal stress. SOLUTION: In this joint seat 7, 71 for an air tank, the joint seat 7, 71 is joined to the surface S of the air tank 1 by welding 14, and the male screw part 8a of pipes 8 for supplying and discharging air to the air devices is screwed in a female screw part 7d formed in a screw hole 12 penetrating the joint seat 7 to connect the seat and the air tank. The female screw part 7d of the joint seat in the vicinity of the joint surface S of the air tank 1 is provided with an undercut part 13 formed to enlarge the inside diameter of the screw hole 12 by cutting a part thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a truck,
The present invention relates to an improvement of an air tank joint in an air piping system mounted on a vehicle such as a bus and an air tank provided with the joint.

[0002]

2. Description of the Related Art For example, an air tank for a vehicle is required to have high performance in various aspects such as pressure resistance, airtightness and shock resistance in order to supply and discharge high-pressure air to various air equipment. In addition to the required performance of the air tank itself, the safe and reliable operation is always ensured so that the surrounding air equipment does not break down due to the air supplied and exhausted from the viewpoint of safe operation of the vehicle. Is also required. In the conventional vehicle high-pressure air tank 1 shown in FIGS. 7 to 10, for example, high-pressure air is accumulated in the inside 3 of a cylindrical air tank body 2 (also referred to as a “drum”). The inside 2 is hermetically shielded from the outside by joining the end plates 4 and 5 (also referred to as “end plates”) by welding. 7
Is a joint sheet formed by forging.
Are fixed by welding at appropriate places. The joint sheet 7 includes a large-diameter portion 7a, a small-diameter portion 7b having a length corresponding to the thickness of the drum 2 in the direction of the axis L, and a step 7c formed between the large and small-diameter portions 7a and 7b. And a female screw portion 7d. In the screw hole of the joint sheet 7, a female screw portion 7d as a taper screw (for example, the taper amount is 1/16)
Is formed, and the male screw portion 8a of the connector 8, which is a mating member, is screwed into and connected thereto. The joint sheet 7 is fixed by welding with the small diameter portion 7b inserted into the hole 4a of the drum 2 and the step 7c is seated on the surface of the drum 2 while being welded to the female screw portion 7d of the joint sheet 7 and the male screw portion 8a of the connector 8 The connector 8 is integrated with the joint sheet 7 by applying a sealant to the joint sheet 7 and tightening it with a predetermined tightening torque (FIG. 9). Reference numeral 9 denotes a pipe made of a pipe or the like which is appropriately airtightly connected to the connector 8, and supplies air to pneumatic devices to form an air pipe system.

[0003]

However, when the conventional joint sheet 7 is welded to the drum 2 and the connector 8 is screwed into the drum 2, the screw is pushed to the back even if there is an error of only 0.1 mm between the two. Since the screw cannot be screwed in, the connector 8 has to be tightened to a specified torque or more to prevent air leakage. In addition, during welding, the female screw portion 7d of the joint sheet 7 is usually deformed by the welding heat transmitted to the joint sheet 7 as shown in FIG. That is, when the material of the joint sheet 7 is aluminum or an aluminum alloy, the joint sheet 7 is susceptible to deformation due to thermal stress, and when the joint sheet 7 is thin in the radial direction, this type of deformation is even greater. Then, the thread of the female screw portion 7d of the joint sheet 7 after the thermal deformation is deformed so as to form the projecting deformation portion 11 in the direction approaching the axis L. In such a situation, since the connector 8 is made of a material having a higher hardness than the joint sheet 7, the male screw portion 8 a of the connector 8 is forcibly screwed in despite the presence of the projecting deformed portion 11, thereby forming the projecting deformed portion 11. However, it is scraped off by the male screw portion 8a. In the unlikely event that the cut pieces are cut off, the air pipe 9
When it enters, it is conceivable that air equipment may be clogged, or air leaks due to adhesion to the valve seat portion of an air valve which is a precision machined part requiring airtightness. Further, as shown in FIG. 11, during the welding operation, the joint sheet 7 is temporarily positioned on the curved surface portion of the drum 2, but the setting by the temporary positioning requires skill, so that the axis L of the joint sheet 7 is aligned with the hole 2a. It may be difficult to match in the radius of curvature direction, and welding may be performed in a state where there is a gap at an angle θ deviating to one side. If welding is performed in this state, it is difficult to form a weld, which may cause air leakage due to poor welding.

The present invention has been devised in view of the above-mentioned problems in the conventional apparatus, and even if the joint sheet is deformed by receiving thermal stress, the shaving by the external thread portion of the mating member is surely prevented. Accordingly, an object of the present invention is to provide a joint sheet for an air tank that prevents clogging of air equipment and air leakage due to damage to a valve seat portion, and further, air leakage due to poor welding, and an air tank including the same. I do.

[0005]

The present invention has the following configuration to achieve the above object. That is, claim 1
The joint sheet for an air tank described above is obtained by joining a joint sheet to the surface of an air tank by welding, and screwing a male screw part of piping for supplying and exhausting air to air equipment into a female screw part formed in a screw hole penetrating the joint sheet. In the joint sheet for an air tank to be joined, a female screw part of the joint sheet near the air tank joint surface has a configuration in which a part of the female screw part is omitted to form an undercut part in which the inner diameter of the screw hole is enlarged. It is.

According to a second aspect of the present invention, there is provided the joint sheet for an air tank according to the first aspect, wherein the joint surface of the air tank of the joint sheet is fitted into a large diameter portion of the joint sheet and a hole of the air tank. The step is formed by a step between the small tank and the small diameter portion, and the step is formed in a shape along the curved surface of the air tank.

[0007] The invention according to claim 3 is the invention according to claim 1 or 2.
The joint sheet for an air tank described above is characterized in that the joint sheet is made of aluminum or an aluminum alloy.

According to a fourth aspect of the present invention, in a joint sheet which is fixed to the surface of an air tank and connects piping for supplying and exhausting air to and from the air equipment, the joint surface of the joint sheet along the curved surface of the air tank is provided. Is formed as described above.

According to a fifth aspect of the present invention, there is provided a male thread portion of piping for joining and joining a joint sheet to the surface of an air tank by welding, and for supplying air to and exhausting air from a female thread portion formed in a screw hole passing through the joint sheet. An air tank provided with an air tank joint sheet that is screwed into and combined with the female screw portion in the vicinity of the air tank joint surface,
An air tank having a joint sheet formed with an undercut portion in which an internal diameter of the screw hole is increased by omitting the female screw portion.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to FIGS. FIG.
Is a cross-sectional view of the drum 2 part, FIG. 2 is an enlarged cross-sectional view of the joint sheet, FIG. 3 is a cross-sectional view showing a state where the joint sheet is welded to the drum 2, and FIG. is there. Same parts as the conventional device,
The members are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate. A feature of the present embodiment is that an undercut portion 13 is formed in which a part of the screw hole 12 of the joint sheet 7 is omitted and the inner diameter of the screw hole 12 is enlarged. That is, in FIG. 2, the female screw portion 7d (taper female screw) of the joint sheet 7 in the portion to be joined to the air tank 1 or in the vicinity of the joining surface, and the female screw portion 7d biased to the hole 2a of the axis L on the drum 2 side is cut. An undercut portion 13 (portion shown by dotted hatching) was provided. The material of the joint sheet 7 is formed of the same material as the air tank 1 such as aluminum or aluminum alloy. Therefore, the inner diameter of the undercut portion 13 is slightly larger than the inner diameter of the thread valley of the remaining female screw portion 7d.

Next, as shown in FIG.
The small-diameter portion 7b of the joint sheet 7 in which the joint 3 is formed is inserted into the hole 2a until the step 7c hits the surface of the drum 2, and the outer periphery of the large-diameter portion 7a of the joint sheet 7 is fixed to the drum 2 by welding 14. . Thus, the joint sheet 7 is hermetically joined to the drum 2 by the welding 14.

The operation of the first embodiment will be described. In FIG. 4, when the connector 8 is screwed into the joint sheet 7 welded to the drum 2 and an air pipe is routed, the male thread 8a of the connector 8 is screwed into the female thread 7d. At this time, even if some heat deformation occurs in the portion of the joint sheet 7 where the undercut portion 13 has been applied due to welding heat at the time of welding, the undercut portion 13 functions as a relief, and therefore enters while being screwed in. The coming male screw portion 8a does not interfere with the undercut portion 13. Therefore, when the connector 8 is screwed, the thermally deformed female screw portion 7d of the joint sheet 7 is not scraped off as in the related art, and the occurrence of cuts can be satisfactorily avoided. For this reason, it is possible to prevent clogging of each pneumatic device and air leakage due to damage to the valve seat portion due to the cut pieces entering the air pipe 9.

Embodiment 2 FIG. Embodiment 2 will be described with reference to FIG. The difference from the first embodiment is that the step 7c in the joint sheet 7 of the first embodiment is
Although the surface exists in a plane in a direction substantially perpendicular to the axis L, in the second embodiment, the surface is formed on a step 7c having a curved surface along the joint surface S of the air tank 1. Other configurations are the same as those of the first embodiment.

According to the second embodiment, when welding the joint sheet 7 to the air tank 1, the joint sheet 7 can be temporarily positioned and seated without any gap between the tank surface and the joint sheet 7, so that the skilled Thus, the welding 14 can be easily made without the need for the air, and the occurrence of air leakage can be reliably prevented. In the second embodiment, the undercut portion 13 is provided in the female screw portion 7d. However, it is needless to say that the female screw portion may be provided in the entire region.

Although the present embodiment has been described in detail, the specific configuration is not limited to this embodiment, and even if there is a design change or the like within a range not departing from the gist of the present invention. Included in the invention. For example, Embodiments 1 and 2
In the above, the female screw portion 7d of the joint sheet 7 is a tapered screw. However, it goes without saying that the present invention can be applied to a straight screw. The joint sheet 7 of the first and second embodiments has a shape having a large-diameter portion 7a and a small-diameter portion 7b, and the small-diameter portion 7b is formed in the hole 2a of the air tank 1.
However, the joint sheet 71 may have a shape having no step 7c as shown in FIG. 6, and may simply be seated on the outer surface of the hole 2a and welded. Further, the case where the air tank 1 is a high-pressure air tank has been described, but it goes without saying that a vacuum tank may be used. In the above description, the air tank is used for a vehicle. However, the present invention can be applied to an air piping system used in other industrial machine plants.

[0016]

As described above, according to the first aspect of the present invention, a joint sheet is joined to the surface of an air tank by welding, and a female screw portion formed in a screw hole passing through the joint sheet is used for air equipment and the like. In the joint sheet for an air tank, which is screwed and connected with a male screw part of piping for supplying and exhausting air, the female screw part of the joint sheet near the air tank joining surface has a part of the female screw part which is absent so that the inner diameter of the screw hole is reduced. It has a configuration in which an expanding undercut portion is formed. With such a configuration, even if the female screw portion is deformed by the heat of welding the joint sheet to the air tank, the deformed portion is cut by screwing the air pipe connector, and the air equipment is clogged. Or
This has the effect of reliably preventing air leakage due to adhesion to the seat portion of the air valve.

According to a second aspect of the present invention, the joint surface of the joint sheet with the air tank is connected to the large diameter portion of the joint sheet.
The step was formed by a step between the small diameter portion fitted into the hole of the air tank, and the step was formed in a shape along the curved surface of the air tank. For this reason, when welding the joint sheet to the air tank, there is no gap between the surface of the air tank and the joint sheet, so that welding can be easily performed and an effect of preventing air leakage can be obtained.

According to the third aspect of the present invention, since the joint sheet is formed of aluminum or an aluminum alloy, the joint sheet can be integrally fixed to the air tank by welding, so that the workability of welding can be improved.

According to a fourth aspect of the present invention, in a joint sheet which is fixed to the surface of an air tank and connects piping for supplying and exhausting air to and from the air equipment, the joint surface of the joint sheet along the curved surface of the air tank. It is a configuration formed as described above. With such a configuration, the joint sheet can be temporarily positioned and welded to the air tank in a state where there is no gap, and as a result, welding can be easily performed, and an effect of preventing air leakage can be obtained.

According to a fifth aspect of the present invention, there is provided a male thread portion of piping for joining and joining a joint sheet to the surface of an air tank by welding, and supplying and discharging air to and from pneumatic devices through a female thread portion formed in a screw hole passing through the joint sheet. An air tank provided with an air tank joint sheet that is screwed into and combined with the female screw portion in the vicinity of the air tank joint surface,
This is a configuration having a joint sheet formed with an undercut portion in which the female screw portion is omitted and the inner diameter of the screw hole is enlarged. Therefore, there is an effect that an air tank without air leakage can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a mounting positional relationship of a joint sheet on a drum 2 according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view of a joint sheet.

FIG. 3 is a cross-sectional view showing a state where a joint sheet is welded to a drum 2;

FIG. 4 is a cross-sectional view in a state where a connector is screwed and connected.

FIG. 5 is a side view of a main part according to the second embodiment.

FIG. 6 is a sectional view showing a modification of the first and second embodiments.

FIG. 7 is a schematic sectional view of a conventional device.

FIG. 8 is a sectional view showing a relationship between a joint sheet and a connector in a conventional device.

FIG. 9 is a cross-sectional view of a conventional device.

FIG. 10 is a cross-sectional view illustrating a defect of a joint sheet in a conventional device.

FIG. 11 is a cross-sectional view illustrating another problem in the conventional device.

[Explanation of symbols]

1 ... Air tank, 2 ... Drum, 4 ... End plate, 4
a: hole, 7: joint sheet, 7a: large diameter part, 7b
... Small diameter part, 7c ... Step, 7d ... Female screw part, 8 ... Connector, 8b ... Male screw part, 9 ... Air piping, 11 ... Protrusion deformation part, 12 ... Screw hole, 13 ... Undercut part, 14 ...
Welding, 71: joint sheet, L: axis, S: joint surface,

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H013 GA03 GA08 3H019 DA03 DA06 DA19 3J046 AA08 BA01 BA08 BC13 BD05 CA02 DA05

Claims (5)

[Claims] 1. An air tank in which a joint sheet is joined to the surface of an air tank by welding, and a male screw section of piping for supplying and exhausting air to air equipment is screwed into a female screw section formed in a screw hole passing through the joint sheet. In the joint sheet for an air tank, the female screw portion of the joint sheet near the air tank joint surface has an undercut portion in which the inside diameter of the screw hole is enlarged by removing a part of the female screw portion. Joint sheet. 2. The air tank joining surface of the joint sheet is formed by a step between a large diameter portion of the joint sheet and a small diameter portion fitted into a hole of the air tank, and the step is formed by the step. The joint sheet for an air tank according to claim 1, wherein the joint sheet is formed along a curved surface of the air tank. 3. The joint sheet for an air tank according to claim 1, wherein the joint sheet is made of aluminum or an aluminum alloy. 4. A joint sheet which is fixed to the surface of an air tank and connects pipes for supplying and exhausting air to and from air devices, wherein the joint surface of the joint sheet is formed along the curved surface of the air tank. Characteristic joint sheet for air tanks. 5. An air tank in which a joint sheet is joined to the surface of the air tank by welding, and a male screw part of piping for supplying and exhausting air to air equipment is screwed into a female screw part formed in a screw hole passing through the joint sheet. An air tank provided with a joint sheet for use in the present invention, characterized in that the female screw portion near the air tank joining surface has a joint sheet formed with an undercut portion in which the internal diameter of the screw hole is enlarged by omitting the female screw portion. And the air tank.