CN215634943U - Sealing connection structure of composite material component - Google Patents

Abstract

A sealing connection structure of a composite material member is used for installing an accessory, the composite material member is provided with a connection hole, the accessory comprises a first cover plate part and an inserting part, the inserting part comprises a large neck section and a small neck section along the direction far away from the first cover plate part, a step surface is formed between the large neck section and the small neck section, and the small neck section is provided with an external thread; still include sealing washer and screw thread and compress tightly the part, the screw thread compresses tightly the part and includes screw thread portion, screw thread portion is equipped with the internal thread, under the mounted state, interlude portion alternates in the connecting hole, and offset along the axial through first apron portion and combined material component, big neck segment is located the connecting hole, big neck segment perpendicular to axial cross-section and connecting hole phase-match, the sealing washer overcoat is installed in little neck segment at least, and offset with the step face, with the clearance between the outer wall of sealed big neck segment and the pore wall of connecting hole, the screw thread compresses tightly the part and passes through screw thread portion and little neck segment threaded connection, and can compress tightly the sealing washer along the axial, the screw thread compresses tightly the part and still offsets along the axial with the combined material component.

Description

Sealing connection structure of composite material component

Technical Field

The utility model relates to the technical field of connecting structures, in particular to a sealing connecting structure of a composite material member.

Background

Composite material components such as carbon fiber are different from metal components, set up annexes such as mount pad on it, and when having the leakproofness requirement, can not directly weld, and if adopt pre-buried technology, have more restriction again to the structural style and the mounted position of annex, and be unfavorable for overhauing, changing, and if adopt the process of gluing, have the problem that the reliability is low again of connecting, especially under the application environment of relative complicacy, life is difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a sealing connection structure of a composite material member, which has high connection reliability and good sealing performance, is basically not influenced by the installation position and the installation form of accessories, and is convenient to overhaul.

In order to solve the technical problem, the utility model provides a sealing connection structure of a composite material member, which is used for installing an accessory, wherein the composite material member is provided with a connection hole, the accessory comprises a first cover plate part and an inserting part, the inserting part comprises a large neck section and a small neck section along the direction far away from the first cover plate part, a step surface is formed between the large neck section and the small neck section, and the small neck section is provided with an external thread; still include sealing washer and screw thread and compress tightly the part, the screw thread compresses tightly the part and includes screw thread portion, screw thread portion is equipped with the internal thread, under the mounted state, the portion of inserting alternate in the connecting hole, and pass through first apron portion with the combined material component offsets along the axial, big neck segment is located in the connecting hole, big neck segment perpendicular to axial cross-section with the connecting hole phase-match, the sealing washer at least overcoat install in little neck segment and with the step face offsets, in order to seal the outer wall of big neck segment with clearance between the pore wall of connecting hole, the screw thread compresses tightly the part through screw thread portion with little neck segment threaded connection, and can compress tightly along the axial the sealing washer, the screw thread compress tightly the part still with the combined material component offsets along the axial.

Adopt this kind of structure, through the setting of sealing washer, can guarantee that the problem that can not cause the leakproofness in the junction after the installation of attached spare, and simultaneously, compress tightly screw-thread fit between part and the little neck through the screw thread, the axial butt of part and first apron portion and combined material component is compressed tightly to the screw thread, a mechanical connection structure has actually been formed, this kind of connection structure is compared in general bonding process, its reliability is higher, more can deal with complicated application environment, can guarantee the life under the long-term use betterly.

More importantly, the sealing connection structure is simple in arrangement, the installation position of the accessory can be conveniently arranged according to the requirement, the sealing connection structure is basically not limited by the structure form of the accessory, and the sealing connection structure can be suitable for the installation of accessories in different forms; moreover, after the installation is completed, if the maintenance requirement or the part replacement requirement exists, the thread pressing part is directly unscrewed, the states of the parts such as the sealing ring can be checked, and the maintenance and the part replacement are both convenient.

Optionally, the threaded pressing part further includes a press-clamping portion, the press-clamping portion and the threaded portion are of a split structure, the press-clamping portion is provided with a sleeve hole, the press-clamping portion is sleeved outside the small neck section through the sleeve hole, and the threaded portion presses the sealing ring through the press-clamping portion.

Optionally, the sleeve hole is a non-circular hole, and a cross section of the small neck section perpendicular to the axial direction is matched with the sleeve hole.

Optionally, the number of the socket holes is several.

Optionally, the crimping portion includes an insertion section and a second cover plate portion, in an installation state, the insertion section is inserted into the connecting hole, a cross section of the insertion section perpendicular to the axial direction matches with the connecting hole, the crimping portion compresses the sealing ring through the insertion section, and the second cover plate portion is axially abutted against the composite material member.

Optionally, one end of the insertion section, which is close to the large neck section, is provided with a second chamfer, in an installation state, a second clamping groove is formed between the second chamfer and the hole wall of the connecting hole, and the sealing ring is further located in the second clamping groove.

Optionally, the cross section perpendicular to the axial direction of the connecting hole and the large neck section is in a non-circular shape.

Optionally, the non-circular figure includes several edges, and two adjacent edges are connected by an arc line segment in a transition manner.

Optionally, at least the outer edge of the step surface is provided with a first chamfer, in an installation state, the first chamfer and the hole wall of the connecting hole form a first clamping groove, and the sealing ring is located in the first clamping groove.

Optionally, the connecting hole is provided with a connecting hole wall, and the connecting hole is provided with a connecting hole which is connected with the first cover plate part and the second cover plate part.

Optionally, the accessory is an axial through-piece provided with a through-hole penetrating in the axial direction.

Optionally, the composite material member is a beam wall with a spring chamber portion integrated in a beam of a bogie of a railway vehicle, and the accessory is an air faucet.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a sealing joint structure for composite material structural members provided in the present invention;

FIG. 2 is a schematic view of the attachment, seal and threaded compression member;

FIG. 3 is a schematic structural view of another embodiment of a sealing joint structure for composite structural members provided in accordance with the present invention;

fig. 4 is a partially enlarged view of the connection portion of the insertion section, the large neck portion, the hole wall of the connection hole and the sealing ring in fig. 3.

The reference numerals in fig. 1-4 are illustrated as follows:

1 composite material member, 11 connecting hole;

2 accessories, 21 a first cover plate part, 22 insertion parts, 221 large neck sections, 222 small neck sections, 223 step surfaces, 223a first chamfer and 23 through holes;

3, sealing rings;

4 screw pressing parts, 41 screw parts, 42 crimping parts, 421 sleeving holes, 422 inserting sections, 422a second chamfer and 423 second cover plate parts;

5 glue layer.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

As used herein, the term "plurality" refers to an indefinite number of plural, usually more than two; and when the term "plurality" is used to indicate a quantity of a particular element, it does not indicate a quantitative relationship between such elements.

The terms "first," "second," and the like, herein are used for convenience in describing two or more structures or components that are identical or similar in structure and/or function and do not denote any particular limitation in order and/or importance.

Referring to fig. 1 to 4, fig. 1 is a schematic structural view of an embodiment of a sealing connection structure of a composite material member according to the present invention, fig. 2 is a schematic structural view of an accessory, a sealing member and a thread pressing part, fig. 3 is a schematic structural view of another embodiment of a sealing connection structure of a composite material member according to the present invention, and fig. 4 is a partially enlarged view of a connection portion of an insertion section, a large neck portion, a hole wall of a connection hole and a sealing ring in fig. 3.

As shown in fig. 1 and 2, the present invention provides a sealing connection structure of a composite material member, which is used for installing an accessory 2, wherein the composite material member 1 is provided with a connection hole 11, the accessory 2 includes a first cover plate portion 21 and an insertion portion 22, the insertion portion 22 includes a large neck section 221 and a small neck section 222 along a direction away from the first cover plate portion 21, a step surface 223 is formed between the large neck section 221 and the small neck section 222, and the small neck section 222 is provided with an external thread; still include sealing washer 3 and screw thread and compress tightly part 4, screw thread compresses tightly part 4 and includes screw portion 41, and screw portion 41 is equipped with the internal thread that matches with the external screw thread.

In the installation state, the penetrating part 22 penetrates through the connecting hole 11 and is abutted against the composite material member 1 along the axial direction through the first cover plate part 21, the large neck section 221 is positioned in the connecting hole 11, the section of the large neck section 221, which is vertical to the axial direction, is matched with the connecting hole 11, wherein the matching refers to the basic consistency of the shape and the size, so that the large neck section 221 can be inserted into the connecting hole 11, and meanwhile, a relatively small gap or a basic gap is formed between the outer wall of the large neck section 221 and the hole wall of the connecting hole 11; the sealing ring 3 is at least externally sleeved on the small neck section 222 and abuts against the step surface 223 to seal a gap between the outer wall of the large neck section 221 and the hole wall of the connecting hole 11, the thread pressing part 4 is in threaded connection with the small neck section 222 through the threaded part 41 and can press the sealing ring 3 along the axial direction, and the thread pressing part 4 also abuts against the composite material member 1 along the axial direction.

Adopt this kind of structure, through the setting of sealing washer 3, can guarantee that the problem of leakproofness can not be aroused in connecting hole 11 department after the installation of annex 2, simultaneously, through the screw-thread fit between screw-thread hold-down part 4 and the little neck 222, the axial butt of screw-thread hold-down part 4 and first apron portion 21 and combined material component 1, a mechanical connection structure has actually been formed, this kind of connection structure is compared in general glueing technology, its reliability is higher, more can deal with complicated application environment, can guarantee the life under the long-term use betterly.

More importantly, the sealing connection structure is simple in arrangement, the installation position of the accessory 2 can be conveniently arranged according to the requirement, the sealing connection structure is basically not limited by the structural form of the accessory 2, and the sealing connection structure can be suitable for the installation of the accessories 2 in various forms; moreover, after the installation is completed, if there is the maintenance demand or the part replacement demand, the screw thread is directly unscrewed and the part 4 is compressed, so that the states of the parts such as the sealing ring 3 can be checked, and the maintenance and the part replacement are both convenient.

The threaded pressing part 4 may include only the threaded portion 41, and in this case, the maximum radial dimension of the threaded portion 41 may be larger than the connecting hole 11, so that the threaded portion 41 may be axially abutted against the composite material member 1 after being screwed to the small neck portion 222.

Specifically, the threaded portion 41 may be a nut member, and the external configuration thereof may be designed with reference to the existing nut structure, which will not be described in detail herein; alternatively, the threaded portion 41 may be a cylindrical member, and the inner hole thereof may be internally threaded only in a partial region in the axial direction, which does not affect the connection of the threaded portion 41 and the small neck portion 222.

Further, the threaded pressing part 4 may further include a press-clamping portion 42, the press-clamping portion 42 and the threaded portion 41 may be a split structure, the press-clamping portion 42 may be provided with a socket hole 421, the press-clamping portion 42 may be externally sleeved on the small neck section 222 through the socket hole 421, and the threaded portion 41 may press the sealing ring through the press-clamping portion 42.

According to the arrangement, the threaded pressing part 4 can be detached in terms of functions and action forms, the threaded part 41 can mainly bear the functions of threaded connection, when the sealing ring 3 is installed, the threaded part 41 rotates relative to the small neck section 222 and performs axial displacement to provide pressing force, the pressing part 42 bears the functions of directly contacting with the sealing ring 3 and pressing the sealing ring 3, when the sealing ring 3 is pressed through the pressing part 42, the pressing part 42 can only perform axial displacement, and therefore when the sealing ring 3 is pressed through the pressing part 42, the sealing ring 3 can be prevented from being stressed to rotate or be deviated, the installation position and the use state of the sealing ring 3 can be guaranteed, sealing performance can be improved, and the sealing ring 3 has positive significance for guaranteeing the service life of the sealing ring 3.

Further, the socket hole 421 may be a non-circular hole, and the cross section perpendicular to the axial direction of the small neck section 222 may match (substantially conform to the shape and size of) the socket hole 421, that is, the small neck section 222 may also be a non-cylindrical body. By adopting the structure, after the crimping part 42 is sleeved on the small neck section 222, the rotation of the crimping part 42 relative to the small neck section 222 can be limited through the matching of the hole wall of the sleeving hole 421 and the outer wall of the small neck section 222, so that the crimping part 42 can only perform axial displacement relative to the small neck section 222, and the sealing ring 3 only bears axial pressure in the use process, as mentioned above, in the installation form, the installation position, the use state, the stress performance and the like of the sealing ring 3 can be ensured, and the service life is long.

It should be noted that the above-mentioned solution that the cross-section of the socket hole 421 and the small neck section 222 perpendicular to the axial direction is set to be non-circular is merely an exemplary illustration of the embodiment of the present invention, which cannot be taken as a limitation to the implementation range of the sealing connection structure of the composite material member provided by the present invention, and in fact, the socket hole 421 may also be a circular hole, and correspondingly, the small neck section 222 may also be a cylinder, which does not affect the implementation of the pressing function; as to the specific non-circular shape, the embodiment of the present invention is not limited, and in practical applications, a person skilled in the art may select the non-circular shape according to actual needs as long as the use requirements can be met, or may design the non-circular shape with rounded corners according to the scheme of the attached drawings, as shown in fig. 2, where the non-circular shape in the attached drawings is a square shape with rounded corners, and the aforementioned external threads may be disposed in the rounded corner regions.

In a specific practice, there may be one or more accessories 2, and even for one accessory 2, there may be a plurality of insertion portions 22, in this case, a plurality of pressure-bonding portions 42 and a plurality of screw portions 41 may be respectively arranged for installation, or a plurality of socket holes 421 may be arranged in one pressure-bonding portion 42 to meet the installation requirement.

It can be understood that, when one crimping portion 42 is configured with a plurality of socket holes 421, and each socket hole 421 is plugged with one inserting portion 22, the inserting portions 22 are matched with the corresponding socket holes 421 to play a good role in limiting the rotation of the crimping portion 42, and at this time, there is no excessive requirement on the shape of the socket holes 421.

With reference to fig. 1 and fig. 2, at least an outer edge of the step surface 223 may be provided with a first chamfer 223a, in an installation state, the first chamfer 223a and a hole wall of the connection hole 11 may form a first slot, and the sealing ring 3 may be located in the first slot.

In this way, the installation position of the seal ring 3 can be conveniently located, and the first chamfer 223a provided on the step surface 223 has a certain guiding function for the seal ring 3 itself, which can guide the seal ring 3 to move toward the gap between the large neck portion 221 and the connection hole 11, and especially when the thread pressing part 4 presses, which has a positive significance for ensuring the sealing effect of the seal ring 3.

The crimping portion 42 may be a plate, and this structure can be seen in fig. 1, in which case, the pressing plate portion 42 cannot extend into the connecting hole 11, and the axial dimension of the large neck portion 221 needs to be close to the connecting hole 11 to ensure that the crimping portion 42 can be pressed against the sealing ring 3.

Besides, the crimping portion 42 may also be provided with an insertion section 422, the insertion section 422 may be inserted into the connecting hole 11 in the installed state, a cross section perpendicular to the axial direction of the insertion section 422 may be matched with (substantially identical in shape and size to) the connecting hole 11, and the crimping portion 42 may compress the seal ring 3 through the insertion section 422.

In this case, as shown in fig. 3 and 4, one end of the insertion section 422 close to the large neck section 221 may be provided with a second chamfer 422a, and in an installation state, a second slot may be formed between the second chamfer 422a and a hole wall of the connection hole 11, and the sealing ring 3 may be further located in the second slot. That is to say, sealing washer 3 can be located first draw-in groove and second draw-in groove simultaneously, if the draw-in groove of saying "half V type" with solitary first draw-in groove, second draw-in groove, then first draw-in groove and second draw-in groove can make up the draw-in groove that forms "full V type", this kind of draw-in groove of "full V type" can lead sealing washer 3 better to press sealing washer 3 to the pore wall of connecting hole 11, thereby seal the clearance between the outer wall of major neck section 221 and the pore wall of connecting hole 11 and handle.

The first and second engaging grooves are formed by providing chamfers on the corresponding components, and in fact, in addition to this manner, an annular notch may be provided on the end surface of the corresponding component, and at this time, the cross-sectional shape of the formed engaging groove may be rectangular, trapezoidal, or the like.

For the crimping section 42 provided with the insertion section 422, it may further comprise a second cover plate portion 423, which second cover plate portion 423 may axially abut against the composite material component 1 in the mounted state. Thus, the length of the part of the crimping part 42 entering the connecting hole 11 can be limited, so that the compression amount of the sealing ring 3 can be regulated and controlled, the sealing ring 3 is prevented from being crushed due to over-compression of the sealing ring 3, and the service life of the sealing ring 3 can be ensured.

The installation position of the sealing ring 3 is not limited to the above position, and in practical applications, the sealing ring 3 may be disposed at other positions, such as between the second cover plate portion 423 and the composite material member 1, between the end surface of the insertion section 422 and the step surface 223, and for the sealing ring 3 disposed at other positions, a corresponding installation groove may be disposed to fix the sealing ring 3, and here, the shape of the installation groove is not limited in the embodiment of the present invention.

Further, the cross-sections of the connection hole 11 and the large neck section 221 perpendicular to the axial direction may be non-circular patterns. In this way, when the accessory 2 is inserted into the connecting hole 11 through the large neck section 221, the anti-rotation design of the accessory 2 can be achieved by matching the outer contour of the large neck section 221 with the hole wall of the connecting hole 11, which can avoid relative rotation between the first cover plate portion 21 and the composite material member 1. Correspondingly, the cross section perpendicular to the axial direction of the aforementioned insertion section 422 may also be non-circular in shape to achieve a similar technical purpose.

Specifically, the non-circular figure may include several edges, and adjacent edges may be transitionally connected by an arc segment. So set up, obvious edges and corners can not exist in the contact position of big neck section 221 and connecting hole 11, and in the installation, even if annex 2 and combined material component 1 produce the trend of relative rotation, also be difficult for causing the destruction to the pore wall of connecting hole 11, can form better protection to combined material component 1.

Further, a glue layer 5 can be included, and the glue layer 5 can be located between the first cover plate part 21 and the composite material member 1 and/or between the outer wall of the large neck part 221 and the hole wall of the connecting hole 11, and is used for performing glue fixation on the accessory 2 and the composite material member 1.

In practical application, the gluing fixation can be used as a pre-connection mode, namely, the accessory 2 is connected with the composite material member 1 through the glue layer 5, so that when the screw thread pressing part 4 is screwed, the accessory 2 is not easy to rotate, relative rotation between the accessory 2 and the composite material member 1 can be avoided, and meanwhile, the installation of the screw thread pressing part 4 can be relatively easy because the accessory 2 does not need to be operated.

In addition, the glue layer 5 can play a certain sealing role and can better ensure the sealing performance by matching with the sealing ring 3. It should be noted that, corresponding to the scheme of being equipped with glue film 5, when dismantling, changing annex 2, can clear away remaining glue film 5 earlier to avoid influencing the gas tightness after the change.

To facilitate understanding of the application of the sealing connection structure provided by the present invention in practice, the following embodiments of the present invention may be described in conjunction with a practical application scenario.

In the rail train field, based on the lightweight product demand of present vehicle, the application of the bogie of combined material preparation such as carbon fiber is gradually increased, and to this form of bogie, its air spring air chamber generally is integrated inside the crossbeam of bogie, but the attached 2 of some forms such as mount pad, air cock of installation on the crossbeam is required again to the realistic condition, as background art said, welding, pre-buried technology, cementing technology all have technical defect or can't implement, and if directly beat the screw hole at the roof beam wall of crossbeam, influence the gas tightness of air spring air chamber again.

Therefore, the sealing connection structure provided by the embodiment of the utility model can be produced at the same time, can better solve the technical problems in the background technology, has high connection reliability, can adapt to complex stress conditions and environmental conditions required by a railway vehicle bogie, can ensure the service life, can meet the sealing requirement of the air spring air chamber, and can be convenient to overhaul.

Specifically, in the rail train field, the above-described attachment 2 may be an axial penetration member, and the axial penetration member may be provided with a through hole 23 penetrating in the axial direction. More specifically, the composite material member 1 may be a beam wall having a spring chamber portion integrated in a beam of a bogie of a railway vehicle, and the accessory 2 may be an air nozzle for communicating the air spring chamber with an air spring provided in the beam.

It should be noted that the above description of the application of the sealing connection structure provided by the present invention in the field of rail trains is only an exemplary description of the embodiment of the present invention, and it is not intended to limit the implementation scope of the sealing connection structure of the composite material member provided by the present invention, in other words, the sealing connection structure provided by the present invention is not limited to the above application field, and may also be applied in other similar application scenarios.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims (12)

1. A sealing connection structure of a composite material member is used for installing an accessory (2), and is characterized in that a connection hole (11) is formed in the composite material member (1), the accessory (2) comprises a first cover plate portion (21) and an inserting portion (22), the inserting portion (22) comprises a large neck section (221) and a small neck section (222) along the direction far away from the first cover plate portion (21), a step surface (223) is formed between the large neck section and the small neck section, and an external thread is formed on the small neck section (222);

still include sealing washer (3) and screw thread hold down part (4), screw thread hold down part (4) are including screw thread portion (41), screw thread portion (41) are equipped with the internal thread, under the installation, interlude portion (22) interlude in connecting hole (11), and pass through first apron portion (21) with combined material component (1) offsets along the axial, big neck section (221) are located in connecting hole (11), big neck section (221) perpendicular to axial cross-section with connecting hole (11) phase-match, sealing washer (3) overcoat at least install in little neck section (222) and with step face (223) offset to seal the outer wall of big neck section (221) with the clearance between the pore wall of connecting hole (11), screw thread hold down part (4) through screw thread portion (41) with little neck section (222) threaded connection, the sealing ring (3) can be pressed in the axial direction, and the thread pressing part (4) is also abutted against the composite material component (1) in the axial direction.

2. The sealing connection structure of the composite material component according to claim 1, wherein the threaded compression part (4) further comprises a crimping part (42), the crimping part (42) and the threaded part (41) are of a split structure, the crimping part (42) is provided with a socket hole (421), the crimping part (42) is sleeved on the small neck section (222) through the socket hole (421), and the threaded part (41) compresses the sealing ring (3) through the crimping part (42).

3. The sealing connection structure of the composite material member as claimed in claim 2, wherein the socket hole (421) is a non-circular hole, and a cross section perpendicular to an axial direction of the small neck section (222) is matched with the socket hole (421).

4. The sealing connection structure of composite material members according to claim 2, wherein the number of the socket holes (421) is several.

5. The sealing connection structure of the composite material member according to claim 2, wherein the crimping portion (42) includes an insertion section (422) and a second cover plate portion (423), the insertion section (422) is inserted into the connection hole (11) in an installation state, a cross section of the insertion section (422) perpendicular to an axial direction is matched with the connection hole (11), the crimping portion (42) compresses the seal ring (3) through the insertion section (422), and the second cover plate portion (423) is axially abutted against the composite material member (1).

6. The sealing connection structure of the composite material member according to claim 5, wherein one end of the insertion section (422) close to the large neck section (221) is provided with a second chamfer (422a), and in an installation state, a second clamping groove is formed between the second chamfer (422a) and the hole wall of the connecting hole (11), and the sealing ring (3) is further positioned in the second clamping groove.

7. The sealing connection structure of composite material members according to claim 1, wherein the cross-sections perpendicular to the axial direction of the connection hole (11) and the large neck section (221) are non-circular patterns.

8. The sealing connection structure of composite material members as claimed in claim 7, wherein said non-circular pattern includes a plurality of sides, and adjacent sides are connected by an arc transition.

9. The sealing connection structure of the composite material member as claimed in any one of claims 1 to 8, wherein at least an outer edge portion of the step surface (223) is provided with a first chamfer (223a), and in a mounted state, the first chamfer (223a) and a hole wall of the connection hole (11) form a first clamping groove, and the sealing ring (3) is positioned in the first clamping groove.

10. The sealing connection structure of the composite material member according to any one of claims 1 to 8, further comprising a glue layer (5), wherein the glue layer (5) is located between the first cover plate portion (21) and the composite material member (1) and/or between the outer wall of the large neck section (221) and the hole wall of the connection hole (11).

11. A sealing connection of composite material elements according to any of claims 1-8, characterised in that the attachment (2) is an axial through-piece provided with a through-hole (23) running through in axial direction.

12. Sealing connection structure of composite material elements according to claim 11, characterised in that the composite material element (1) is a beam wall with a hollow spring chamber portion integrated in the beam of a bogie of a railway vehicle and the accessory (2) is an air tap.

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