GROMMET ARRANGEMENT

Description

[0001] The invention relates to a sealing grommet arrangement with a sealing grommet designed as a corrugated tube of constant outer diameter over its length, which projects with its one end through an opening in a housing wall and on which a retaining ring for holding the sealing grommet on the housing wall is arranged, which projects with a radially inner region radially inward into a corrugation trough of the sealing grommet and which can be connected to the housing wall to close the opening in the housing wall.

[0002] In such a sealing grommet arrangement, it is known that a retaining ring with a locking lug engages in a corrugation trough of the corrugated pipe and is connected to the housing wall by means of a retaining ring, holding it in position. This sealing grommet arrangement has a complex design and can only be installed with considerable effort.

[0003] From WO 2012 / 074443 A1 a sealing grommet arrangement according to the preamble of claim 1 is known.

[0004] The object of the invention is therefore to provide a sealing grommet arrangement of the type mentioned at the outset which, with a simple structure and simple assembly, enables the same sealing grommet to be used for different lengths of the sealing grommet protruding from the opening in the housing wall.

[0005] This object is achieved according to the invention in that the retaining ring has a central through-opening with the inner contour of which the retaining ring projects into a trough of the sealing grommet, wherein the sealing grommet consists of an elastically deformable material such that the retaining ring can be moved from one trough to an adjacent trough in an elastically deforming manner by applying a certain axial minimum force.

[0006] This design allows the same grommet to be used for different required lengths of the grommet protruding from the housing wall. The retaining ring is moved along the grommet into a trough that corresponds to the desired length of the grommet protruding from the opening in the housing wall. No additional components or special tools are required.

[0007] For the same grommet, the retaining ring can also be designed with a different outer diameter, so that the same sealing grommet can be used for openings of different diameters in the housing wall.

[0008] In this way, the storage and logistics costs for the storage nozzles are significantly reduced.

[0009] Since the same sealing grommet can be used for different applications, only a single tool is required to manufacture it.

[0010] If the retaining ring is in contact with the inner contour of its through-hole in the corrugation trough of the sealing grommet, the retaining ring is held on the sealing grommet without any play.

[0011] The retaining ring can be arranged on the sealing grommet independently of its rotational position and thus facilitates assembly if the through opening of the retaining ring has a circular contour.

[0012] If the retaining ring is in contact with the outer contour of the shaft trough with the inner contour of its through-hole and pre-tensioned, the retaining ring sits tightly on the sealing grommet.

[0013] The sealing grommet can have a gripping contour at one of its end areas, at which the sealing grommet can be grasped manually, for example, and subjected to axial force.

[0014] This makes it possible to pull the retaining ring into the desired position on the sealing grommet by pulling on the gripping contour.

[0015] To secure the retaining ring to the housing wall, the retaining ring can be provided on its outer radially circumferential area with a connecting structure that can be connected to the housing wall.

[0016] In a simple design, the connecting structure can be a radially circumferential annular groove that is open radially outwards and has a groove width corresponding to the wall thickness of the housing wall and a diameter at the bottom of the annular groove that corresponds to the diameter of the opening in the housing wall.

[0017] If the retaining ring is made of an elastically deformable material and can be snapped into the opening in the housing wall with its annular groove, the retaining ring can be connected to the housing wall by simply snapping it into the opening in the housing wall.

[0018] If the retaining ring has a radially circumferential sealing lip on its radially circumferential outer periphery, it rests sealingly against the housing wall when installed.

[0019] If the sealing lip is designed to be elastic and its radially inner region is connected to the groove wall of the annular groove further away from the housing wall and its freely projecting radially outer region is inclined towards the housing wall, the retaining ring, when attached to the housing wall, rests against the housing wall with preload, increasing the sealing effect.

[0020] An embodiment of the invention is illustrated in the drawing and described in more detail below. The sole figure of the drawing shows a sealing grommet arrangement in longitudinal section.

[0021] The sealing grommet arrangement shown in the figure has a sealing grommet 1 which is designed as a corrugated tube of constant diameter over its length with alternating wave troughs 2 and wave heights 3.

[0022] The sealing grommet is made of an elastic material.

[0023] At its left end, the sealing grommet 1 is provided with a tab 4 as a gripping contour, while at its right end it has a bent nozzle 5.

[0024] It goes without saying that the nozzle can have any shape. It can extend straight to the sealing grommet or even be flexible enough to bend in any direction.

[0025] In its left end area, a retaining ring 6 with its central through-opening 7 is arranged in a corrugation trough 2, enclosing the sealing grommet 1 with its inner contour 8. The retaining ring 6 rests with the inner contour 8 of its through-opening 7 against the outer contour of the corrugation trough 2 on the sealing grommet 1 with prestress.

[0026] In the left end area of ​​the sealing grommet 1, the retaining ring 6 is shown in a state attached to a housing wall 10, while to the right of it, identical retaining rings 6' and 6" are shown in two other possible positions on the sealing grommet 1.

[0027] The retaining ring 6, 6', 6" has on its outer radially circumferential area a radially circumferential, radially outwardly open annular groove 9, which has a groove width corresponding to the wall thickness of the housing wall 10.

[0028] At the bottom 11 of the annular groove 9, this has a diameter that corresponds to the diameter of an opening 12 in the housing wall 10.

[0029] The retaining ring 6.6' 6" is made of an elastic material and is positioned on the sealing grommet 1 by snapping over several wave heights 3 of the latter. By snapping its annular groove 9 into the opening 12 of the housing wall 10, the retaining ring 6 is fastened together with the sealing grommet 1 to the housing wall 10.

[0030] On its radially outer periphery, the retaining ring 6, 6' 6" is provided with a radially encircling sealing lip 13, which is connected by its radially inner region 14 to the groove wall 15 of the annular groove 9, which is further away from the housing wall 10. With its freely projecting radially outer region 16, the sealing lip 13 is inclined towards the housing wall 10 when not installed in the housing wall 10.

[0031] When the retaining ring 6 is installed in the housing wall 10, the sealing lip 13 is deformed outwards in the radial direction and rests against the housing wall 10 with sealing preload. List of reference symbols

[0032] 1 Sealing grommet 2 Wave troughs 3 Wave heights 4 Tab 5 Connector 6 Retaining ring 7 Through opening 8 Inner contour 9 Annular groove 10 Housing wall 11 Base 12 Opening 13 Sealing lip 14 Radial inner area 15 Groove wall 16 Radial outer area

Claims

1. A sealing grommet arrangement having a sealing grommet (1) which is designed as a corrugated tube of constant external diameter over its length, a. which projects with its one end through an opening (12) in a housing wall (10) and b. on which a retaining ring (6) for retaining the sealing grommet (1) on the housing wall (10) is arranged, wherein the retaining ring (6) projects with the inner contour of its through-opening (7) radially inwards into a corrugation trough (2) of the sealing grommet (1) and wherein the retaining ring (6) can be connected to the housing wall (10) so as to close the opening (12) in the housing wall (10), c. wherein the retaining ring (6) has a central through-opening (7) with the inner contour (8) of which the retaining ring (6) projects into a corrugation trough (2) of the sealing grommet (1), d. wherein the sealing grommet (1) consists of an elastically deformable material such that the retaining ring (6) can be moved elastically deforming the sealing grommet (1) from one corrugation trough (2) into an adjacent corrugation trough (2) by applying a certain minimum axial force, e. wherein the retaining ring (6) has a radially surrounding sealing lip (13) on its radially surrounding outer periphery, f. wherein the sealing lip (13) is elastic, and the sealing lip (13) is connected with its radially inner region (14) to the groove wall (15) of the annular groove (9) which is remote from the housing wall (10), characterised in that g. the sealing lip (13) is inclined with its freely projecting radially outer region towards the housing wall (10) when the retaining ring (6) is not installed in the housing wall (10), and h. that the sealing lip (13) is deformed radially outwards and bears against the housing wall (10) with sealing preload when the retaining ring (6) is installed in the housing wall (10).

2. The sealing grommet arrangement according to one of the preceding claims, characterised in that the retaining ring (6) is in contact with the inner contour (8) of its through-opening (7) in the corrugation trough (2) of the sealing grommet (1).

3. The sealing grommet arrangement according to claim 2, characterised in that the through-opening (7) of the retaining ring (6) has a circular contour.

4. The sealing grommet arrangement according to one of claims 2 and 3, characterised in that the retaining ring (6) bears with the inner contour (8) of its through-opening (7) with prestress against the outer contour of the corrugation trough (2).

5. The sealing grommet arrangement according to one of the preceding claims, characterised in that the sealing grommet (1) has a gripping contour at one of its end regions, on which the sealing grommet (1) can be gripped and axially force-loaded.

6. The sealing grommet arrangement according to one of the preceding claims, characterised in that the retaining ring (6) is provided on its outer radially surrounding region with a connecting structure which can be connected to the housing wall (10).

7. The sealing grommet arrangement according to claim 6, characterised in that the connecting structure is a radially surrounding, radially outwardly open annular groove (9) which has a groove width corresponding to the wall thickness of the housing wall (10) and a diameter at the bottom (11) of the annular groove (9) corresponding to the diameter of the opening (12) in the housing wall (10).

8. The sealing grommet arrangement according to claim 7, characterised in that the retaining ring (6) consists of an elastically deformable material, and the retaining ring (6) can be latched with its annular groove (9) into the opening (12) of the housing wall (10).