JPH083726Y2 - Pressure vessel for air suspension - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pressure vessel used for an air suspension.

Prior art A resin-made cylindrical portion having an annular groove formed on an outer peripheral surface on one end side, and an outer peripheral side end portion of a diaphragm made of an elastic material integrally provided with a mesh structure covers the annular groove. A pressure vessel for an air suspension is considered, which is fixed to the outer peripheral surface on one end side of the cylindrical portion by a ring-shaped member in this state. For example, an example thereof is shown in Japanese Utility Model Laid-Open No. 63-187745, which was filed and filed by the applicant earlier, and the outer peripheral side end of the diaphragm is formed by a ring-shaped member on the outer peripheral surface of one end side of the cylindrical part. When it is fastened to the diaphragm, a part of the diaphragm bulges into the annular groove, so that the airtightness between the cylindrical portion and the diaphragm is suitably ensured and the diaphragm is prevented from coming off from the cylindrical portion. It is supposed to be done.

Problems to be Solved by the Invention However, since the diaphragm is made of an elastic material, the diaphragm bulges from the outer peripheral surface of the cylindrical portion of the diaphragm based on the engagement between the portion bulged in the annular groove of the diaphragm and the annular groove. It is difficult to surely prevent the pull-out, and it has been desired to further increase the pull-out load of the diaphragm.

The present invention has been made in view of the above circumstances, and its purpose is to provide a ring-shaped member on an outer peripheral surface of a resin cylindrical portion while covering an annular groove formed on the outer peripheral surface. An object of the present invention is to provide a pressure vessel for an air suspension capable of increasing a pull-out load at an outer peripheral side end portion of a clamped diaphragm without increasing the number of parts or the like.

Means for Solving the Problems In order to achieve the above object, the present invention provides a pressure vessel for an air suspension of the type described above, wherein the outer peripheral side end of the diaphragm is a ring-shaped member and the outer peripheral side of the cylindrical part is one side. A plurality of protrusions that pierce the mesh structure of the diaphragm when tightened on the surface are integrally provided on the outer peripheral surface of the cylindrical portion on one end side.

With this configuration, the outer peripheral end of the diaphragm is clamped to the outer peripheral surface of the one end of the cylindrical portion by the ring-shaped member, so that part of the diaphragm is attached to the outer peripheral surface of the one end of the cylindrical portion. With the outer peripheral side end of the diaphragm bulged in the formed annular groove can be fixed airtightly in a state where a predetermined disconnection load is applied to the outer peripheral surface on one end side of the cylindrical portion,
A plurality of protrusions provided on the outer peripheral surface on one end side of the cylindrical portion can be pierced into the mesh structure of the diaphragm, and the pull-out load of the diaphragm is suitable based on the engagement between the mesh structure and the protrusion. Can be increased to.

Moreover, since the protrusion is integrally provided on the outer peripheral surface on the one end side of the cylindrical portion, and a separate ring-shaped member is not required to pierce the protrusion into the mesh structure of the diaphragm, the number of parts and the assembly The above effect can be obtained without increasing the number of working steps.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, a pressure vessel for air suspension (hereinafter, simply referred to as a pressure vessel) 10 includes a resin-made outer cylinder portion 12 having a cylindrical shape as a whole and an outer cylinder at an axially intermediate portion of the outer cylinder portion 12. A resin-made partition wall portion 14 integrally formed on the inner peripheral surface of the partition portion 12, and a bottomed cylindrical shape, and a cylindrical portion 16 projectingly provided on one side in the axial direction of the outer cylinder portion 12 of the partition wall portion 14. The inner cylindrical portion 18 made of metal fitted to the inner peripheral surface at one end on the bottom side, and the portion located on the inner peripheral side are airtightly fixed to the other end of the inner cylindrical portion 18 by welding and the outer periphery. The portion located on the side is configured by including a metal bottom wall portion 20 facing the partition wall portion 14 fixed to one end portion of the outer tubular portion 12 by crimping, and the inner cylinder portion 18 side of the partition wall portion 14 side. A main chamber 22 is formed on the opposite side (lower side in FIG. 1), and an annular sub-chamber 24 is formed between the outer tubular portion 12 and the inner tubular portion 18. It has been. Outer cylinder 12
A connecting metal fitting 26 having a communication hole for supplying air into the main chamber 22 is provided on the peripheral wall of the outer cylinder portion 12 and the partition wall portion 14.
It is embedded integrally during molding. The bottom side of the inner tubular portion 18 is exposed inside the main chamber 22 through a hole 28 provided on the inner peripheral side of the cylindrical portion 16 of the partition wall portion 14, and the bottom portion of the inner tubular portion 18 is relatively A large-diameter through-hole 30 is provided, and a pair of relatively small-diameter through-holes 32 are provided on the peripheral wall of the inner tubular portion 18 at positions facing each other, whereby these through-holes 30, 32 are provided. The chambers 22 and 24 are allowed to communicate with each other through the holes 28. Incidentally, 34 and 36 are O-rings for ensuring airtightness.

One end side outer peripheral surface of the outer tubular portion 12 located on the main chamber 22 side, and a cylindrical member disposed on the inner peripheral side of the outer tubular portion 12.
A diaphragm 40 made of a male material made of rubber is fixed between the one end side outer peripheral surface of 38 and the outer peripheral side end and the inner peripheral side end thereof by ring-shaped members 42 and 44, respectively. ing. A mesh-like structure (not shown) such as cloth is integrally provided over the entire surface of the diaphragm 40 for the purpose of reinforcement.

As shown in FIGS. 1 and 2, a plurality of annular grooves 46 are provided in the outer peripheral surface of the outer tubular portion 12 at the outer peripheral surface of the one end portion where the outer peripheral end of the diaphragm 40 is fastened. The outer cylinder portion is continuously provided along a direction parallel to the axis of the portion 12, and is more outer than the annular groove 46 on the outer peripheral surface on one end side of the outer cylinder portion 12.
12 A plurality of conical projections 48 having a height smaller than the wall thickness of the diaphragm 40 are provided at a portion located on the other end side at predetermined intervals in the circumferential direction. They are arranged in two rows at a predetermined interval in a direction parallel to the axis of the tubular portion 12. Then, in the state where the outer peripheral side end of the diaphragm 40 is clamped by the ring-shaped member 42 to the outer peripheral surface on the one end side of the outer tubular portion 12, a part of the diaphragm 40 is bulged into the annular groove 46. With projection 48
Is pierced into the mesh-like structure of the diaphragm 40. The arrangement position of the diaphragm 40 of the mesh-like structure in the thickness direction, the height and the apex angle of the protrusion 48, and the like are determined in advance. In the present embodiment, the outer cylindrical portion 12 constitutes a cylindrical portion. The protrusion 48 is integrally formed when the outer cylinder portion 12 and the like are formed.

The pressure vessel 10 configured as described above is arranged, for example, on the outer peripheral side of a shock absorber having a cylinder attached to an unsprung member of a vehicle and a piston rod provided so as to project from the inside of the cylinder. The cylinder is hermetically fixed to the cylindrical member 38 with the cylindrical member 38 inserted therethrough, and the vehicle is fixed by a plurality of bolts 50 (only two are shown in this embodiment) projecting from the bottom wall 20. Is fixed to the sprung member.

As described above, according to the present embodiment, the outer peripheral side end portion of the diaphragm 40 is clamped by the ring-shaped member 42 on the outer peripheral side end portion of the outer peripheral portion 12 of the pressure vessel 10 by the ring-shaped member 42, so that a part of the diaphragm 40 is formed. The outer peripheral end of the diaphragm 40, which is bulged into the annular groove 46 of the outer cylinder portion 12, is airtightly fixed in a state where a predetermined pull-out load is applied to the outer peripheral surface of the outer cylinder portion 12, and the outer cylinder A plurality of protrusions 48 provided on the outer peripheral surface on the one end side of the portion 12 pierce the mesh-like structure of the diaphragm 40,
Based on the engagement between the mesh-like structure and the protrusion 48, the pull-out load of the diaphragm 40 from the outer cylindrical portion 12 can be suitably increased.

Further, according to the present embodiment, the protrusion 48 is integrally formed with the outer cylindrical portion 12, and a single ring-shaped member is not required to pierce the protrusion 48 into the mesh structure of the diaphragm 40. Since the ring-shaped member 42 is sufficient, the above effect can be obtained without increasing the number of parts, the number of assembling steps, and the like.

In the above-described embodiment, the protrusion 48 has a conical shape, but when the outer peripheral side end of the diaphragm 42 is tightened by the ring-shaped member 42 to the outer peripheral surface of the one end portion of the outer tubular portion 12, the diaphragm 42 is tightened. Any shape may be used as long as it can be suitably pierced into the net-like structure, and a triangular pyramid shape or the like may be used.

Further, in the above-described embodiment, the protrusion 48 is provided in a portion located on the other end side of the outer tubular portion 12 with respect to the annular groove 46 on the outer peripheral surface on the one end side of the outer tubular portion 12, but it is not always necessary. Alternatively, the positional relationship between the protrusion 48 and the annular groove 46 may be reversed, or the protrusion may be provided in a portion located between the annular grooves provided at a predetermined interval, and further. It is also possible to provide protrusions in the annular groove.

Further, in the above-described embodiment, the outer peripheral side end of the diaphragm 42 is also formed in the ring-shaped member 42 even in the portion where the protrusion 48 is provided.
It is fastened to the outer peripheral surface of the outer cylindrical portion 12 by means of, but this is not always necessary. For example, as shown in FIG. 3, the outer peripheral surface of the outer cylindrical portion 12 in the vicinity of the protrusion 48 and the outer peripheral side end portion of the diaphragm 42 are The protrusion 48 may pierce the mesh-like structure of the diaphragm 42 with a predetermined gap d formed therebetween. In this case, adjust the height of the protrusion 46 to the diaphragm.
It may be thicker than 42.

Further, although the annular groove 46 has a triangular cross section in the above-described embodiment, it may be an annular groove having a rectangular cross section or the like.

In addition, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is a view showing an example of a pressure vessel for an air suspension to which the present invention is applied, showing a state in which a diaphragm is fixed. FIG. 2 is a view showing a main part of the pressure vessel of FIG. FIG. 3 is a view showing another example of the present invention and is a view corresponding to the main part of FIG. 10: Pressure vessel for air suspension 12: Outer cylinder part (cylindrical part) 40: Diaphragm 42: Ring member 46: Annular groove 48: Protrusion

Claims (1)

[Scope of utility model registration request] 1. An outer peripheral side end of a diaphragm made of an elastic material, which has a resin cylindrical portion having an annular groove formed on the outer peripheral surface on one end side, and is integrally provided with a mesh structure. In a pressure vessel for an air suspension, which is tightened and fixed by a ring-shaped member to an outer peripheral surface on one end side of the cylindrical portion in a state of covering the groove, an outer peripheral side end portion of the diaphragm is the cylindrical portion by the ring-shaped member. A pressure vessel for an air suspension characterized in that a plurality of projections that pierce the mesh-like structure of the diaphragm when tightened on the outer peripheral surface on one end side are integrally provided on the outer peripheral surface on the one end side of the cylindrical portion.