JP2562189Y2 - Pressure vessel for air suspension - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention comprises a resin member having a cylindrical portion and a partition wall integrally provided at an axially intermediate portion inside the cylindrical portion, and the inner diameter of one end of the cylindrical portion is different from that of the other. The present invention relates to a pressure vessel for an air suspension having a smaller diameter than a portion.

[0002]

2. Description of the Related Art There has been known an air suspension pressure vessel including a resin member integrally having a cylindrical portion and a partition portion dividing the inside of the cylindrical portion at an intermediate portion in the axial center direction. For example, the one described in Japanese Patent Application Laid-Open No. 63-187745, which was filed and filed by the present applicant, is one example. In this pressure vessel for an air suspension, the resin member is integrally molded. In addition, an outer peripheral end of a diaphragm made of an elastic material is fixed to an outer peripheral surface on one end side of the cylindrical portion in a state where the outer peripheral end is clamped by a ring-shaped member. And, in such a kind of pressure vessel for air suspension, for example,
One end of the cylindrical part is narrowed to the inner peripheral side in order to secure the volume inside the cylindrical part as large as possible under the condition that the installation space at the one end of the cylindrical part at the time of assembly to the vehicle is restricted. In some cases, the inner diameter at one end of the cylindrical portion is smaller than the other portion of the cylindrical portion.

[0003]

However, in the case where a resin member having a partition portion in the cylindrical portion and having an inner diameter at one end side of the cylindrical portion smaller than that of the other portion is integrally formed as described above. However, since an undercut exists inside one end of the cylindrical portion, it was necessary to divide the core of the mold into a plurality in the circumferential direction. For this reason, when mass-producing a core in a state where the core is assembled and the core is disassembled and disassembled from a molded product by using a robot, the core is loaded, disassembled and disassembled. However, there is a problem in that the molding cycle becomes longer, the molding cycle becomes longer, and the molding apparatus becomes more complicated and more expensive, thereby increasing the cost of the pressure vessel for the air suspension. In addition, since the core is divided into a plurality of parts, abrasion or deformation occurs in the divided cores during repeated molding, which may cause burrs or the like on a molded product (resin-made member) and impair the quality thereof. there were.

[0004] On the other hand, if a core configured to be reduced in diameter is assembled into a mold and a molded product is automatically taken out by using the opening and closing operation of the mold, an undercut is formed in the cylindrical portion. Even if it has, it is not necessary to divide the core and, as a result, the work of assembling, loading and disassembling the core by the robot is required, so that the resin member can be easily and quickly molded, so that the cost of the air suspension pressure vessel can be suitably reduced. it is conceivable that. However, even in this case, if the undercut is relatively large, the following problem occurs. That is, when the core whose diameter can be reduced as described above is used, the thickness of the mold is greatly increased, and it is inevitable that the mold structure is complicated and the mold cost is greatly increased. Is not always able to be reduced appropriately. In addition, since the core configured to be reduced in diameter is difficult to obtain sufficient strength structurally, the quality of the resin member may not be sufficiently obtained due to the insufficient strength of the core, and the core may be reduced in diameter. Since it is relatively difficult to secure large dimensions, there is a disadvantage that the degree of freedom in designing the resin member cannot be sufficiently obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a resin having a cylindrical portion and a partition portion integrally provided at an axially intermediate portion inside the cylindrical portion. A pressure vessel for an air suspension having a cylindrical member having an inner diameter at one end side of the cylindrical portion smaller than that of the other portion of the cylindrical portion, while securing the quality and design flexibility of the resin member. It is to provide at low cost.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide an integral structure including a cylindrical portion and a partition portion dividing the inside of the cylindrical portion at an intermediate portion in the axial center direction. An air suspension pressure vessel of a type comprising a resin member, wherein the inner diameter of one end side of the cylindrical portion is smaller than the other portion of the cylindrical portion, and a resin cylindrical member constituting the cylindrical portion; The resin member is formed by separately molding the resin partition members constituting the partition part and welding the resin partition member to the inner peripheral surface of the resin cylindrical member.

[0007]

According to the pressure vessel for an air suspension having the above construction, the resin cylindrical member forming the cylindrical portion and the resin partition member forming the partition portion are separately formed to form the resin partition member. By welding to the inner peripheral surface of the resin cylindrical member, a resin member integrally having the cylindrical portion and the partition portion is formed, so that the inner diameter of one end of the cylindrical portion is larger than that of the other portion of the cylindrical portion. Even when the diameter is small, when molding the resin cylindrical member constituting the cylindrical portion, since there is no undercut inside the resin cylindrical member, the core of the mold is divided or reduced in diameter. A cylindrical member made of resin can be molded without using a possible core. This makes it possible to shorten the molding cycle of the resin cylindrical member and to configure the molding device at a low cost as compared with the conventional case that requires assembling, loading, disassembling and unloading of the core by a robot. Although separate molds are required for forming the partition member, the mold cost can be suitably reduced as compared with a mold using a core whose diameter can be reduced. In this case, furthermore, the molding of the resin partition member can be performed quickly, and the welding between the resin cylindrical member and the resin partition member can be performed relatively quickly, and the welding device is inexpensive compared to the robot. Can be configured. As a result, the cost of the resin member, and thus the pressure vessel for the air suspension, can be suitably reduced.

In addition, since it is not necessary to use a split core that easily generates burrs or a core whose diameter and diameter are difficult to secure sufficiently, it is difficult to reduce the quality and design freedom of the resin member. And the above effect can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, an air suspension pressure vessel (hereinafter, simply referred to as a pressure vessel) 10 has an outer cylinder portion 12 having a cylindrical shape as a whole, and an outer cylinder portion at an axially intermediate portion of the outer cylinder portion 12. A partition 16 integrally provided on the inner peripheral surface of the portion 12 and having a cylindrical projection 14 at the center.
And a metal inner cylinder which has a cylindrical shape with a bottom and is hermetically fitted to the inner peripheral surface of the cylindrical protrusion 14 of the partition 16 via an O-ring 18 on the bottom side. Part 2
0, a ring-shaped and plate-shaped portion, and a portion located on the inner peripheral side is hermetically fixed to the outer peripheral surface on the opening side of the inner cylindrical portion 20 by welding, and a portion located on the outer peripheral side is the outer cylindrical portion 12.
And a metal member 25 consisting of a metal bottom wall portion 24 airtightly crimped through an O-ring 22 at one end of the outer cylinder portion 12 with the partition wall portion 16 in the outer cylinder portion 12 interposed therebetween. A main chamber 26 is formed on the opposite side (lower side in FIG. 1) from the bottom wall 24 side, and an annular sub-chamber is formed on the bottom wall 24 side with the partition 16 in the outer cylinder 12 therebetween. 28 are formed. In the present embodiment, the outer cylindrical portion 12 forms a cylindrical portion.

A connection fitting 3 having a communication hole 30 is provided in a stepped hole 29 provided so as to penetrate in a thickness direction at a portion of the outer cylinder portion 12 located on the main chamber 26 side.
2 is buried by, for example, an ultrasonic insert, and air is supplied into the main chamber 26 through a not-shown notch of a rubber member 34 (hatching is omitted) fixed to the connection fitting 32 so as to close the communication hole 30. It is supposed to be. On the other hand, a relatively large-diameter through hole 36 is provided at the bottom of the inner cylindrical portion 20, and a pair of relatively small-diameter through holes 38 Is provided. Thus, communication between the two chambers 26 and 28 via the through holes 36 and 38 is allowed.

The pressure vessel 10 configured as described above is
For example, a plurality of bolts 40 protruding from the bottom wall 24
(Only two of them are shown in FIG. 1) to the sprung member of the vehicle, and a piston rod of a shock absorber (not shown) attached to the unsprung member of the vehicle passes through the through hole 36 from the main chamber 26 side to the inner cylinder. It is adapted to be inserted into the part 20.

At the end of the outer cylinder 12 on the side of the main chamber 26, there is provided an inward flange 41 at the tip.
A small diameter portion 42 having a smaller diameter than other portions is formed. An outer peripheral end of an annular diaphragm 44 made of an elastic material is provided on the outer peripheral surface of the small diameter portion 42.
The inner end of the diaphragm 44 is directly or indirectly fixed to the cylinder of the shock absorber. In FIG. 1, reference numeral 48 denotes a backup ring.
2 are provided integrally on the inner peripheral surface.

The resin member 17 is manufactured, for example, as follows. That is, first, as shown in FIG. 2 and FIG.
The resin cylindrical member (hereinafter abbreviated as a cylindrical member) 50 constituting the outer cylindrical portion 12 and the resin partition member (hereinafter abbreviated as the partition member) 52 constituting the partition portion 16 are made of thermoplastic resin such as nylon. Each is molded with a resin material. In this case, since there is no undercut inside the cylindrical member 50, the core of the mold for molding the same may be a single core that is not divided in the circumferential direction. The annular groove for forming the partition member 5
After the molding of No. 2, it is formed by cutting. Next, as shown in FIG. 2, after the partition member 52 is disposed at a predetermined position (the position indicated by a dashed line) in the cylindrical member 50, the partition member 52 is parallel to the axis with respect to the cylindrical member 50. By applying ultrasonic welding to the annular welded portions of the two members 50 and 52 while pressing in the direction, the welded portions are welded over the entire circumference, and the resin member 17 shown in FIG. 1 is obtained. In addition,
The backup ring 48 is pressed into a predetermined position on the inner peripheral surface of the cylindrical member 50 prior to the ultrasonic welding, and the connection fitting 32 is connected to the cylindrical member 50 or a resin member before or after the ultrasonic welding. The ultrasonic wave is inserted into the stepped hole 29 of the outer cylindrical portion 12 of the member 17. In FIG. 2, the illustration of the stepped hole 29 is omitted.

As described above, according to this embodiment, the partition member 5
2 is ultrasonically welded to the inner peripheral surface of the cylindrical member 50 to manufacture the resin member 17 in which the partition 16 is provided integrally with the outer cylinder 12. Even if the small diameter portion 42 is formed and the inside diameter of the small diameter portion 42 is smaller than the other portion of the outer cylinder portion 12, the outer cylinder portion 1
When the cylindrical member 50 constituting the second member 2 is formed, since there is no undercut inside the cylindrical member 50, the core of the mold for forming the cylindrical member 50 can be divided or reduced in diameter. Cylindrical member 5 without using
0 can be molded. Thereby, the molding cycle of the cylindrical member 50 can be shortened and the molding apparatus can be configured at low cost as compared with the conventional case that requires the assembling, loading, disassembling and unloading of the core by the robot, and the cylindrical member 50 and the Although separate molds are required for forming the partition member 52, the mold cost can be reduced more preferably than a mold using a core whose diameter can be reduced. In this case, furthermore, the partition member 52 can be formed quickly, and the ultrasonic welding of the cylindrical member 50 and the partition member 52 can be performed relatively quickly, for example, within 10 seconds, and the ultrasonic welding device can be formed. Can be configured at a lower cost than the above-described robot, so that the cost of the resin member 17 and thus the pressure vessel 10 can be suitably reduced.

Further, according to the present embodiment, it is not necessary to use a split core that easily generates burrs or a core whose diameter and diameter are hardly sufficiently reduced to reduce the quality and design of the resin member 17. The above effects can be obtained without lowering the degree of freedom.

While the embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other embodiments.

For example, in the above embodiment, the partition member 52
The resin member 17 is manufactured by ultrasonic welding to the inner peripheral surface of the cylindrical member 50, but it is not always necessary. For example, the resin member 17 is circumferentially or radially And friction welding such as vibration welding in which the members 50 and 52 are vibrated and welded at a predetermined amplitude, spin welding in which the members 50 and 52 are rotated in opposite directions to be welded in a pressurized state, or one of the members 50 and 52 Are welded by hot plate welding in which the two members 50, 52 are welded by heating and pressing the two members 50, 52 together, or hot air welding in which the two members 50, 52 are welded using a resin welding bead softened by hot air. Alternatively, welding may be performed by generating heat in a high-frequency magnetic field with a magnetic body such as a high-frequency induction heating mesh or a wire sandwiched between the welding surfaces.

Further, in the above-described embodiment, the small diameter portion 42 having the inward flange 41 at the end is provided at one end side of the outer cylindrical portion 12, but it is not always necessary.
The inward flange 41 may not be provided, or the inward flange 41 may be provided at one end of the outer cylindrical portion 12 without being narrowed at one end of the outer cylindrical portion 12 like the small-diameter portion 42. It may be. In short, the effect of the present invention can be obtained if the inside diameter of one end of the cylindrical part is smaller than the other part of the cylindrical part.

Further, in the above embodiment, the backup ring 48 is press-fitted on the inner peripheral surface of the small diameter portion 42 of the outer cylinder portion 12, but the backup ring 48 may be formed integrally with the outer cylinder portion 12, It may not be provided.

Although the partition 16 has the cylindrical projection 14 in the above embodiment, it may be a plate having no cylindrical projection.

In addition, it goes without saying that the present invention can be carried out in various modified forms without departing from the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an air suspension pressure vessel of the present invention.

FIG. 2 is a cross-sectional view showing a resin cylindrical member constituting an outer cylindrical portion of the pressure vessel of FIG.

FIG. 3 is a cross-sectional view showing a resin partition member constituting a partition section of the pressure vessel of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pressure container for air suspension 12 Outer cylinder part (cylindrical part) 16 Partition part 17 Resin member 50 Resin cylindrical member 52 Resin partition member

Claims (1)

(57) [Scope of request for utility model registration] 1. A resin member integrally comprising a cylindrical portion and a partition portion dividing the inside of the cylindrical portion at an intermediate portion in the axial center direction, wherein the inner diameter of one end of the cylindrical portion is other than that of the cylindrical portion. A pressure vessel for an air suspension having a diameter smaller than that of the resin partition, wherein the resin cylindrical member forming the cylindrical portion and the resin partition member forming the partition portion are separately molded to form the resin partition. A pressure vessel for an air suspension, wherein the resin member is formed by welding a member to an inner peripheral surface of the resin cylindrical member.