WO2020043444A1

WO2020043444A1 - Seal assembly and machine part for such a seal assembly

Info

Publication number: WO2020043444A1
Application number: PCT/EP2019/071137
Authority: WO
Inventors: Reinhold WALDEIER; Andreas Fritz
Original assignee: Parker Hannifin Emea S.A.R.L.
Priority date: 2018-08-30
Filing date: 2019-08-06
Publication date: 2020-03-05
Also published as: DE102018121255A1

Abstract

The present invention relates to a seal assembly (100) which has a first machine part (1), a second machine part (2) which is to be mounted on the first machine part (2), for example as a cover, and an annular seal (3) arranged in between. In order to improve the mounting and the sealing effect, the seal (3) and the contour of the second machine part (2) are designed such that, during mounting, the seal (3) passes by way of a rolling process from an initial installation position into a final mounting position and is held there by the specific contour of the installation space (4).

Description

Sealing arrangement and machine part for such a sealing arrangement

The present invention relates to a sealing arrangement, in particular for sealing between a first machine part and a second machine part. The present invention further relates to a machine part, in particular a cover, for mounting in or on a further machine part.

The radial seal in a bore usually requires an insertion bevel on one of the two machine parts to be sealed against each other, otherwise the seal will be destroyed during assembly. Often, however, there is no space to implement such a chamfer or chamfer on the machine part, or the existing design cannot be changed, e.g. in a flange seal. Even a seal designed as an O-ring does not remedy such designs.

The present invention has for its object to provide a seal assembly and a corresponding machine part, in particular a lid, which allow easy and non-destructive assembly of the seal with improved sealing effect. According to the invention, a sealing arrangement is provided with

a first machine part with a first end section with a first end surface and a first circumferential surface,

a second machine part with a second end section with a second end surface and a second circumferential surface for mounting in or on the first end section of the first machine part, so that in the assembled state the second end surface is opposite the first end surface and the second circumferential surface of the second circumferential surface che is opposite, and

an annular seal with a polygonal cross section for mounting in an installation space formed between the second circumferential surface and the first circumferential surface,

wherein the second circumferential surface of the second machine part has a seal mounting area, a seal seat area and a seal rolling area located therebetween, the seal seat area being closer to the second end face than the seal mounting area,

the distance between the second circumferential surface and the first circumferential surface being smaller in the region of the seal rolling region than in the region of the seal assembly region and the seal seat region,

wherein the seal seat area extends obliquely to the first circumferential surface, starting from the seal rolling area increasing distance from the first circumferential surface, and wherein the thickness of the seal in the direction transverse to the first circumferential surface is greater than the distance between the seal mounting region and the first circumferential surface.

According to the invention, a machine part, in particular a lid, is also used

Use provided in such a sealing arrangement

with a second end section with a second end surface and a second circumferential surface for mounting in or on a first end section of a first machine part with a first end surface and a first circumferential surface, so that in the assembled state the second end surface is opposite the first end surface and the second Circumferential surface opposite the first circumferential surface

wherein the second circumferential surface of the second machine part has a seal mounting area, a seal seat area and a seal roll area located therebetween the seal seat area being closer to the second end surface than the seal assembly area,

wherein the seal seat area extends obliquely to the first circumferential surface, starting at the seal rolling area increasing distance from the first circumferential surface, and wherein the second circumferential surface with the first circumferential surface forms an installation space for mounting an annular seal with a polygonal cross section.

[0006] The solution according to the invention makes a usually required lead-in chamfer or chamfer on the machine part, in or on which the further machine part to be assembled (e.g. a cover) is to be mounted, superfluous. A special contour of the sealing seat and the seal creates a snap-in function according to the invention, which brings the machine part to be assembled into the final assembly position, where it is held by the special contour of the installation space. This function thus means that the fixing of the machine part to be assembled, which is usually necessary, in order to hold it in this final assembly position, is superfluous. This makes handling very easy and eliminates the risk of incorrect assembly. Constructions without this contour show a remaining axial assembly force that tries to push the machine part to be assembled out again, which is why fastening elements are usually required to carry this additional load.

In one embodiment of the sealing arrangement it is provided that the

Sealing roll area is stepped, cone-shaped, rounded or sawtooth-shaped.

The sealing roll-off area preferably has the least on both sides of the point

Distance to the first circumferential surface obliquely to the first circumferential rolling surfaces. These make it easier to roll the seal when installing the seal without damaging it. In a further embodiment it is provided that the seal mounting area runs essentially parallel to the first circumferential surface. This makes it easier to insert and hold the seal when inserting it into the installation space.

The seal can basically have different cross sections. The seal preferably has a triangular cross section, in particular in the form of an equilateral or isosceles triangle. A triangular cross-section enables advantageous rolling behavior and a secure fit in the end position. Alternatively, the seal has a square, hexagonal, octagonal or round cross section.

In a further embodiment it is provided that the second end section has at its end facing away from the second end surface a projection which extends to the first circumferential surface and which adjoins the seal assembly area. This protrusion helps in particular to keep the seal in its initial assembly position and to prevent it from slipping off the machine part to be assembled during assembly.

Furthermore, it is provided in one embodiment that the seal before assembly of the

Seal arrangement is used in the seal assembly area and that the seal after assembly of the seal arrangement is arranged essentially between the seal seat area, the seal rolling area and the first circumferential surface. The seal thus rolls through the assembly over the sealing roll area and then automatically maintains its position in its end position.

[0013] The thickness of the seal in the direction transverse to the first circumferential surface is preferably in the range from 5 to 50%, in particular in the range from 10 to 30%, greater than the distance between the seal assembly region and the first circumferential surface. As a result, the seal is unrolled and pressed between the machine elements without being damaged. [0014] The cross section of the seal towards the first circumferential surface is preferably reduced.

As a result, the first machine part can grip the tapered cross section of the seal well and roll it over the seal rolling area of the second machine part.

[0015] There are basically two configurations of the first and second machine parts. In one configuration, the second machine part is designed such that it has a larger cross section in its end region and is plugged onto the first machine part, the end region of which it overlaps. In this embodiment, the first end surface is an inner end surface, the second end surface is an inner end surface, the first circumferential surface is an outer circumferential surface and the second circumferential surface is an inner circumferential surface.

In another embodiment, the second machine part is designed such that it has a smaller cross section in its end region and is inserted into the first machine part, in the end region of which it engages. In this other embodiment, the first end surface is an outer end surface, the second end surface is an outer end surface, the first peripheral surface is an inner peripheral surface and the second peripheral surface is an outer peripheral surface.

[0017] The proposed (second) according to a further aspect of the present invention

The machine part, which is designed in particular as a cover, can be further developed in a corresponding manner as explained above in relation to the sealing arrangement.

The present invention is explained below with reference to the drawings. Show it:

1 shows a cross section of a first embodiment of the seal arrangement according to the invention in an initial installation position of the seal,

2 shows a cross section of the first embodiment of the seal arrangement according to the invention shown in FIG. 1 in an end position of the seal, 3 shows an enlarged section of the first embodiment of the sealing arrangement according to the invention shown in FIGS. 1 and 2 in various positions from the installation of the seal to the final position,

4 shows a diagram of the assembly force of the machine part to be assembled over the assembly path,

5 shows a cross section of a second embodiment of the seal arrangement according to the invention in an initial installation position of the seal, and

6 shows a cross section of the second embodiment of the seal arrangement according to the invention shown in FIG. 5 in an end position of the seal.

Fig. 1 shows a cross section of a first embodiment of the invention

Sealing arrangement 100 in an initial installation position of seal 3. FIG. 2 shows a cross section of the first embodiment of sealing arrangement 100 according to the invention shown in FIG. 1 in an end position of seal 3.

[0020] The sealing arrangement 100 has a first machine part 1, a second machine part

2, which is to be mounted on the first machine part 1, for example as a cover, and an annular seal 3 arranged between them. The first machine part 1 can, for example, be a compressor (air compressor) in the automotive sector, on which the second machine part 2 is mounted as a cover.

The first machine part 1 has a first end portion 10 with a first (in this

Embodiment inner) end surface 11 and a first (in this embodiment outer) circumferential surface 12.

The second machine part 2 has a second end section 20 with a second (in this embodiment inner) end surface 21 and a second (in this embodiment inner) circumferential surface 22 for mounting on the first end section 10 of the first machine part 1. Die respective surfaces are dimensioned and shaped so that in the assembled state (see FIG. 2) the second end surface 21 is opposite the first end surface 11 and the second circumferential surface 22 is opposite the second circumferential surface 12.

The annular seal 3 has a polygonal cross section for mounting in an installation space 4 formed between the second circumferential surface 22 and the first circumferential surface 12. In this embodiment, the seal 3 has a triangular cross section, the sides being an equilateral Form a triangle.

The second circumferential surface 22 of the second machine part 2 has a seal mounting area 23, a seal seat area 24 and a seal rolling area 25 lying therebetween, the seal seat area 24 being closer to the second end face 21 than the seal mounting area 23. In the area of the Seal rolling area 25, the distance between the second circumferential surface 22 and the first circumferential surface 12 is smaller than in the area of the seal mounting area 23 and the seal seat area 24. The seal seat area 24 runs obliquely to the first circumferential surface 12, starting with the seal rolling area 25 increasing distance from the first circumferential surface 12. Furthermore the thickness of the seal 3 in the direction transverse to the first circumferential surface 12 is greater than the distance between the seal mounting region 23 and the first circumferential surface 12.

In the sealing arrangement according to the invention, the seal 3 is introduced by a rolling process and not by a sliding process, as in the case of conventional comparable sealing arrangements. The proposed geometry of the seal and the installation space, which is determined in particular by the geometry of the second machine part, the desired defined positioning of the seal 3 is achieved.

Fig. 3 shows an enlarged section of the first shown in Figs. 1 and 2

Embodiment of the sealing arrangement 100 according to the invention in various positions from the installation of the seal to the final assembly. The position shown in FIG. 3A corresponds to the installation position shown in FIG. 1, the position shown in FIG. 3E corresponds to the mounting position shown in FIG. 2, and that in FIGS. 3B, 3C and 3D positions shown correspond to corresponding intermediate positions during assembly.

As can be seen in particular in Fig. 3B, the seal 3 attached at the right place in the specially designed contour begins to roll when the edge 13 of the first machine part 1 touches the contour of the inner circumferential surface 22 of the second machine part 2. This movement makes it possible to realize the radial deformation of the seal 3 which can be seen in FIGS. 3C and 3D without the seal 3 sliding and cutting. The special seal cross-section in connection with the geometry of the second machine part 2 thus allows the seal 3 to roll into the end position (assembly position).

In the end position shown in Fig. 3E, the seal 3 shows when the second

Machine part 2 touches the end face 1 1 of the first machine part 1, the compression required for proper sealing. As can be seen from the diagram shown in FIG. 4, which shows the assembly force of the second machine part over the assembly path, the force required to push the second machine part 2 onto the first machine part 1 initially increases due to the deformation of the seal 3. If the maximum assembly force is overcome, the special contour of the installation space leads to a decreasing assembly force and even converts it into a negative value, i.e. the first machine part 1 is pulled into the final position during the final assembly. With this snap-in function, the first machine part 1 can no longer fall off the second machine part 2, as a result of which other usual fastening means, such as screws or clamps, are either completely eliminated or at least with regard to them their number and / or fastening force can be reduced.

Fig. 5 shows a cross section of a second embodiment of the invention

Seal assembly 200 in an initial installation position of the seal. FIG. 6 shows a cross section of the second embodiment of the seal arrangement 200 according to the invention shown in FIG. 5 in an end position of the seal 3. Unlike the seal arrangement 100 shown in FIGS. 1-2, the first machine part 1 here has a larger one Cross-section and is designed as a bore into which the second machine part 2 is inserted. In this embodiment, the first end surface 11 is an outer one End surface, the second end surface 21 an outer end surface, the first circumferential surface 12 an inner circumferential surface and the second circumferential surface 22 an outer circumferential surface. Otherwise, the design is fundamentally identical and the mode of operation is also equivalent to the design and mode of operation of the sealing arrangement 100. In this configuration too, the assembly force is converted into a negative value by the special contour of the sealing seat, ie the second machine part 2 is in the final assembly pulled into the hole, which is perceived as snapping.

The solution according to the invention allows the first machine part to be used as it is, that is to say with an unsuitable or also without an insertion slope. The assembly forces that occur are lower than with conventional solutions. Furthermore, no lubrication is required according to the invention; however, the seal assembly can also be lubricated, i.e. work with very low coefficients of friction and fulfill the desired function.

The sealing body preferably consists of an elastomer, in particular PA, PK,

PEEK, PBT, PPS, PPA, ABS, UHMW-PE, NBR, HNBR, FKM, EPDM, CR, VMQ, FVMQ, FFKM, PU or PTFE.

The embodiments described above and shown in the figures are only to be understood as exemplary and non-restrictive embodiments of the invention. Various modifications and variants of the sealing arrangement and of the second machine part are conceivable within the scope of the invention. In particular, the dimensions and arrangements of various elements can be designed differently.

Claims

claims

1. Sealing arrangement (100) with:

a first machine part (1) with a first end section (10) with a first end surface (1 1) and a first circumferential surface (12),

a second machine part (2) with a second end section (20) with a second end surface (21) and a second circumferential surface (22) for mounting in or on the first end section of the first machine part, so that in the assembled state the second end surface (21) the first end face (1 1) is opposite and the second circumferential surface (22) the second circumferential surface (12) is opposite, and

an annular seal (3) with a polygonal cross-section for mounting in an installation space (4) formed between the second peripheral surface (22) and the first peripheral surface (12),

wherein the second circumferential surface (22) of the second machine part (2) has a seal mounting area (23), a seal seat area (24) and an intermediate seal roll area (25), the seal seat area (24) closer to the second end face (21) lies as the seal mounting area (23),

the distance between the second circumferential surface (22) and the first circumferential surface (12) being smaller in the region of the sealing rolling region (25) than in the region of the sealing mounting region (23) and the sealing seat region (24),

wherein the sealing seat area (24) extends obliquely to the first circumferential surface (12) with increasing distance from the first circumferential surface (12) starting with the sealing rolling region (25), and

the thickness of the seal (3) in the direction transverse to the first circumferential surface (12) being greater than the distance between the seal mounting area (23) and the first circumferential surface (12).

2. Sealing arrangement according to claim 1,

characterized in that the sealing roll-off area (25) is designed step-like, cone-shaped, rounded or sawtooth-shaped.

3. Sealing arrangement according to one of the preceding claims, characterized in that the sealing roll area (25) has rolling surfaces (27, 28) running on both sides of the point (26) at the smallest distance from the first circumferential surface (12) obliquely to the first circumferential surface (12).

4. Sealing arrangement according to one of the preceding claims,

characterized in that the seal mounting area (23) extends substantially parallel to the first circumferential surface (12).

5. Sealing arrangement according to one of the preceding claims,

characterized in that the seal (3) has a triangular cross section.

6. Sealing arrangement according to claim 5,

characterized in that the seal (3) has a cross section in the form of an equilateral or isosceles triangle.

7. Sealing arrangement according to one of claims 1 to 4,

characterized in that the seal (3) has a square, hexagonal, octagonal or round cross section.

8. Sealing arrangement according to one of the preceding claims,

characterized in that the second end section (20) has at its end facing away from the second end face (21) a projection (29) extending to the first circumferential face (12) and adjoining the seal mounting area (23).

9. Sealing arrangement according to one of the preceding claims,

characterized in that the seal (3) is inserted in the seal assembly area (24) before assembly of the seal arrangement and that the seal after assembly of the seal assembly essentially between the seal seat area (24), the seal rolling area (25) and the first circumferential surface (12) is arranged.

10. Sealing arrangement according to one of the preceding claims, characterized in that the thickness of the seal (3) in the direction transverse to the first circumferential surface (12) in the range from 5 to 50%, in particular in the range from 10 to 30%, is greater than the distance between the seal mounting area (23) and the first circumferential surface (12).

1 1. Sealing arrangement according to one of the preceding claims,

characterized in that the cross-section of the seal (3) decreases towards the first circumferential surface (12).

12. Sealing arrangement according to one of the preceding claims,

characterized in that the first end surface (11) is an inner end surface, the second end surface (21) is an inner end surface, the first peripheral surface (12) is an outer peripheral surface and the second peripheral surface (22) is an inner peripheral surface.

13. Sealing arrangement according to one of claims 1 to 1 1,

characterized in that the first end surface (11) is an outer end surface, the second end surface (21) is an outer end surface, the first peripheral surface (12) is an inner peripheral surface and the second peripheral surface (22) is an outer peripheral surface.

14. Machine part (2), in particular cover, for use in a sealing arrangement according to one of the preceding claims with a second end section (20) with a second end surface (21) and a second peripheral surface (22) for mounting in or on a first End section (10) of a first machine part with a first end surface (11) and a first circumferential surface (12), so that in the assembled state the second end surface (21) is opposite the first end surface (11) and the second circumferential surface (22) lies opposite the first circumferential surface (12),

the distance between the second circumferential surface (22) and the first circumferential surface (12) being smaller in the region of the seal rolling region (25) than in the region of the seal mounting region (23) and the seal seat region (24), wherein the seal seat area (24) extends obliquely to the first circumferential surface (12), starting from the seal roll region (25) increasing distance from the first circumferential surface (12), and

the second circumferential surface (22) forms an installation space (4) with the first circumferential surface (12) for the assembly of an annular seal (3) with a polygonal cross section.

15. Machine part according to claim 14,

16. Machine part according to one of claims 14 and 15,

characterized in that the sealing roll area (25) has rolling surfaces (27, 28) running on both sides of the point (26) at the smallest distance from the first circumferential surface (12) obliquely to the first circumferential surface (12).

17. Machine part according to one of claims 14 to 16,

18. Machine part according to one of claims 14 to 17,

characterized in that the second end surface (21) is an inner end surface and the second circumferential surface (22) is an inner circumferential surface.

19. Machine part according to one of claims 14 to 17,

characterized in that the second end surface (21) is an outer end surface and the second circumferential surface (22) is an outer circumferential surface.