JPH0343477Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a pressure vessel used for air suspension.

Prior Art An outer cylinder part, a partition part integrally provided with the outer cylinder part at an intermediate part in the axial direction of the outer cylinder part, and a partition part integrally provided at one end part with the partition part on one side in the axial direction of the outer cylinder part of the partition part. A type comprising an inner cylindrical portion provided with a cylindrical shape, and a bottom wall portion integrally provided between the other end of the inner cylindrical portion and one end of the outer cylindrical portion, facing the partition wall portion. A pressure vessel for air suspension is known. In such a pressure vessel, the outer cylindrical section, the partition wall section, the inner cylindrical section, and the bottom wall section are each constructed of separate metal members, and each member is fixed to each other by welding.

Problems to be solved by this invention However, when welding the members that make up such a pressure vessel, each member must be welded all the way around to ensure airtightness of the pressure vessel. It takes a relatively long time and man-hours to manufacture the container, and it is also relatively difficult to weld the members to each other in an airtight manner over the entire circumference.

Means for Solving the Problems The present invention was made against the background of the above circumstances, and its purpose is to manufacture the above-mentioned pressure vessels without welding. . In order to achieve this object, the present invention provides an air suspension pressure vessel of the type described above, in which the outer cylindrical portion and the partition wall are integrally molded from resin, and when the integral molding is performed, the inner periphery of the partition wall is A cylindrical part is formed that protrudes from the side in a direction parallel to the axis of the outer cylinder part, and an annular part is formed in the intermediate part in the direction parallel to the axis of the outer cylinder part and protrudes in the outer circumferential direction from the outer circumferential surface of the one end of the outer cylinder part. While forming an annular projection having a groove, the inner cylinder part and the bottom wall part are integrally molded from metal, and the one end of the inner cylinder part is airtightly fitted into the cylindrical part, and the annular projection is It is characterized in that a portion located on the outer peripheral side of the bottom wall portion is hermetically caulked to the annular projection so as to sandwich the projection in a direction parallel to the axis of the outer cylinder portion.

Effects of operation and invention With this structure, the outer cylinder part and the partition wall part are integrally molded from resin, the inner cylinder part and the bottom wall part are integrally molded from metal, and the metal inner cylinder part is integrally molded from metal. The one end of the part is simply airtightly fitted into the cylindrical part integrally provided on the resin partition wall part, and the annular protrusion integrally provided on the outer peripheral surface of one end of the resin outer cylinder part is connected to the outer cylinder part shaft. The pressure vessel is manufactured by simply caulking the outer circumferential side of the metal bottom wall to the annular protrusion in a direction parallel to the center.
When the partition wall part and the inner cylinder part are each airtightly fixed, the conventional welding work which takes a relatively long time is no longer necessary, and the manufacturing time of the pressure vessel can be further shortened, and the outer cylinder part and the partition part are fixed together. This eliminates the need for additional work, thereby further reducing the number of manufacturing steps, while ensuring the airtightness of the pressure vessel more reliably than in the conventional case where the pressure vessel is manufactured exclusively by welding.

Moreover, since the annular protrusion is provided with an annular groove in the middle part in the direction parallel to the axis of the outer cylinder, when caulking the outer peripheral side of the bottom wall part to the annular protrusion, The boundary between the annular projection and the part of the outer cylinder where the annular projection is not provided is caused by caulking stress causing parts located on both sides of the annular projection to approach each other with the annular groove in between. The application of caulking stress can be effectively suppressed. Thereby, it is possible to effectively prevent the outer cylinder from being damaged at the boundary portion during caulking, thereby preventing the airtightness of the pressure vessel from being impaired.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, 10 is a pressure vessel for air suspension. The pressure vessel 10 has a cylindrical shape with a bottom, and includes an outer cylinder part 12 made of resin and a partition part 14 made of resin that is integrally molded with the outer cylinder part 12 at an intermediate part in the axial direction. A partition wall portion 14 is provided at one end of the bottom side on one side in the axial direction of the outer cylinder portion 12.
A metal inner cylinder part 16 is provided integrally with the inner cylinder part 16, and the part located on the inner peripheral side is airtightly fixed to the other end of the inner cylinder part 16 by welding, and the part located on the outer peripheral side is an outer cylinder. The inner cylinder part 16 of the partition part 14 is configured to include a metal bottom wall part 18 which is integrally fixed to one end part of the partition part 12 and faces the partition part 14.
A main chamber 20 is formed on the opposite side (lower side in FIG. 1), and an annular subchamber 22 is formed between the outer cylinder part 12 and the inner cylinder part 16. The bottom side of the inner cylinder part 16 is exposed into the main chamber 20 through a hole 23 provided in the partition wall part 14, and a relatively large diameter through hole 24 is provided at the bottom of the inner cylinder part 16. In addition, a relatively small-diameter through hole 26 is provided in the peripheral wall of the inner cylindrical portion 16, so that communication between the chambers 20 and 22 is allowed through these through holes 24 and 26. It's summery. In the pressure vessel 10, for example, a shock absorber having a cylinder and a piston rod protruding from the inside thereof is inserted through the inside thereof, and a plurality of bolts 28 protruding from the bottom wall portion 18 are installed.
(only one is shown in FIG. 1) is fixed to the sprung member of the vehicle, and the end of the outer cylinder 12 opposite to the bottom wall 18 side (lower end in FIG. 1) and the vehicle A predetermined elastic membrane or the like is installed between the cylinder and the unsprung member.

The outer periphery of the hole 23 of the partition wall 14 is provided with a bottom wall 18 in a direction parallel to the axis of the outer cylinder 12.
A cylindrical portion 30 protruding toward the side is integrally formed, and one end (bottom side end) of the inner cylindrical portion 16 is attached to the inner peripheral surface of the cylindrical portion 30.
6. They are airtightly fitted via a rubber seal member 32 fixed to the outer peripheral surface. On the other hand, the outer cylinder part 12
As shown in FIGS. 1 and 2, an annular projection 34 projecting toward the outer periphery is integrally formed on the outer circumferential surface of the side end of the bottom wall 18. An annular groove 35 is formed in the middle portion in a direction parallel to the 12-axis center. A rubber seal is attached to the annular projection 34 at a portion located on the outer peripheral side of the bottom wall 18 so as to sandwich the annular projection 34 in a direction parallel to the axis of the outer cylinder 12. It is crimped airtightly via a member 36. The depth and width of the annular groove 35 are such that when the bottom wall portion 18 is caulked onto the annular projection 34, the portions of the annular projection 34 located on both sides of the annular groove 35 are moved close to each other while maintaining their strength. It is predetermined in relation to the material, etc., so that it can be made to extend as necessary and sufficiently in the direction of

As described above, according to this embodiment, when the outer cylinder part 12, the bottom wall part 18, the partition wall part 14, and the inner cylinder part 16 are hermetically fixed, the welding work that takes a relatively long time as in the conventional case is not required. , the manufacturing time of the pressure vessel 10 is further shortened, and foreign matter such as spatter generated during welding is effectively prevented from remaining in the chamber.
4 is not necessary, and the manufacturing man-hours are further reduced. On the other hand, the outer cylinder part 12 and the partition wall part 14 are integrally molded, and the partition wall part is formed between the outer cylinder part 12 and the bottom wall part 18. 14 and the inner cylindrical portion 16 are sealed by seal members 36 and 32, respectively, instead of by welding, the airtightness of the pressure vessel 10 is more reliably ensured than in the past.

Further, according to this embodiment, since the annular groove 35 is provided in the annular protrusion 34, when caulking the bottom wall portion 18 to the annular protrusion 34, the annular groove 35 of the annular protrusion 34 should be used in between. As a result, the portions located on both sides are bent in the direction toward each other, and caulking stress acts on the boundary portion between the annular projection 34 and the portion of the outer cylinder portion 12 where the annular projection 3 is not provided. is effectively suppressed. This effectively prevents the outer cylindrical portion 12 from being damaged at the boundary portion and the airtightness within the subchamber 22 from being impaired. In this case, even if a crack occurs in a part of the circumferential direction at the base of the annular projection 34 as shown by the dotted line in FIG. There is almost no risk of damage.

Further, according to this embodiment, although the annular protrusion 34 is provided at one end of the outer cylindrical portion 12, the wall thickness of the one end of the outer cylindrical portion 12 is made substantially uniform due to the presence of the annular groove 35. Therefore, there is an advantage that the provision of the annular protrusion 34 effectively prevents air from entering into one end of the outer cylindrical portion 12 during molding.

Further, according to this embodiment, since the outer cylinder part 12 and the partition wall part 14 are molded from resin, the pressure vessel 10 is made smaller than the conventional case in which the outer cylinder part and the partition wall part are molded from metal. There are advantages that the weight is relatively reduced and that corrosion of the pressure vessel 10 can be effectively prevented because the outer cylinder portion 12 exposed to the outside is made of resin.

In addition, in the above-mentioned embodiment, the annular projection 34
The outer circumferential surface of the outer cylindrical portion 12 is inclined so that the diameter becomes smaller as the distance from the partition wall portion 14 increases, but this is not necessarily the case. For example, as shown in FIG. It's okay to be forced to do so.

Further, in the above-mentioned embodiment, airtightness between the outer cylinder part 12 and the bottom wall part 18 is ensured by the seal member 36 fixed to the bottom wall part 18, but this is not necessarily necessary. Groove 35
A sealing member such as an O-ring may be inserted inside.

Further, in the above-mentioned embodiment, the seal member 32 fixed to the outer peripheral surface of one end of the inner cylinder part 16 ensures airtightness between the partition wall part 14 and the cylindrical part 30, but this is not necessarily necessary. For example, ,
An O-ring may be inserted between the annular groove formed on the inner peripheral surface of the cylindrical portion 30 and the outer peripheral surface of the inner cylindrical portion 16.

Furthermore, although the seal members 32 and 36 have regular shapes in the above-mentioned embodiments, they are not necessarily necessary, and may be of an irregular shape such as a paste, or the bottom wall portion 18 can be formed into an annular shape. By caulking the projection 34 onto the annular projection 34 while elastically deforming the projection 34 in a direction parallel to the axis of the outer cylinder portion 12,
Alternatively, if necessary and sufficient airtightness can be ensured by fitting one end of the inner cylindrical portion 16 into the cylindrical portion 30 while elastically deforming it in the outer circumferential direction, the seal member may not be provided.

Further, in the above embodiment, the bottom portion is provided at the end of the inner cylinder portion 16 on the partition wall portion 14 side.
If the inner cylinder part is not provided with such a bottom, it is also possible to fit the inner circumferential surface of the inner cylinder part to the outer circumferential surface of the cylindrical part.

Further, in the above-described embodiment, the inner cylinder part 16 and the bottom wall part 18 are constructed of separate members and are integrally fixed to each other by welding, but the inner cylinder part 16 and the bottom wall part 18 may be integrally molded from a single plate. This has the advantage that welding work between the inner cylinder part 16 and the bottom wall part 18 is not necessary.

In addition, various changes may be made to the present invention without departing from the spirit thereof.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of an air suspension pressure vessel to which the present invention is applied. FIG. 2 is an enlarged view of the main part of FIG. 1. FIG. 3 is a diagram showing another example of the present invention, and corresponds to FIG. 2. 10: Pressure vessel, 12: Outer cylinder part, 14: Partition wall part, 16: Inner cylinder part, 18: Bottom wall part, 30: Cylindrical part, 34: Annular projection, 35: Annular groove.

Claims (1)

[Claims for Utility Model Registration] An outer cylindrical portion, a partition portion integrally provided with the outer cylindrical portion at an axially intermediate portion thereof, and a partition wall portion on one side of the outer cylindrical portion in the axial direction of the partition portion. an inner cylindrical portion integrally provided at one end with the partition; and an integrally provided opposite end of the partition between the other end of the inner cylindrical portion and one end of the outer cylindrical portion. In a pressure vessel for air suspension of a type having a bottom wall portion, the outer cylinder portion and the partition wall portion are integrally molded from resin, and when the integral molding is performed, the outer cylinder portion is removed from the inner peripheral side of the partition wall portion. a cylindrical part protruding in a direction parallel to the axis of the outer cylinder part, and an annular groove protruding outward from the outer circumferential surface of the one end of the outer cylinder part in a middle part in a direction parallel to the axis of the outer cylinder part; The inner cylindrical part and the bottom wall are integrally molded of metal, the one end of the inner cylindrical part is airtightly fitted into the cylindrical part, and the annular protrusion A pressure vessel for air suspension, characterized in that a portion located on the outer peripheral side of the bottom wall portion is hermetically caulked to the annular protrusion so as to sandwich the bottom wall portion in a direction parallel to the axis of the outer cylinder portion.