BR112013004899B1 - SEALING SYSTEM - Google Patents

Abstract

low load displacement seal. the present invention relates to a seal that is provided for insertion in a hole in an external element and engaging an internal element received in the hole. the seal includes an outer annular insert having a first diameter and an inner annular insert having a second diameter smaller than the first diameter. an elastomeric body includes an overmoulded outer portion at the outer annular insert and an overmoulded inner seal at the inner annular insert and including an intermediate web extending between the outer portion and the inner portion. the web extends both axially and radially in relation to a central geometric axis of the external annular insertion. the inner seal includes an inner seal surface and the outer portion including an outer seal surface.

Description

Descriptive Report of the Invention Patent for SEALING SYSTEM.

CROSS REFERENCE TO RELATED ORDERS

[001] This application is partly a continuation of US patent application 12 / 861,892, filed on August 24, 2010, which claims the benefit of provisional application US 61 / 236,640, filed on August 25, 2009; and also claims the benefit of provisional application US 61 / 387,638, filed on September 29, 2010. The full descriptions of the above applications are incorporated herein by reference.

FIELD

[002] The present description refers to seals and more particularly to a low load dual insertion displacement seal.

BACKGROUND AND SUMMARY

[003] This section provides background information related to this description that is not necessarily prior art.

[004] Seals are commonly used to seal a gap arranged around an external surface of an internal element received in a bore of an external element, such as a fuel injector, a spark plug tube or an axle. Conventional seals incorporate an external rubber dimension (OD) to engage a hole and can have various internal dimension (ID) seal configurations to engage an axle or other internal element.

[005] A seal is provided for insertion in a hole in an external element and engaging an internal element received in the hole. The seal includes an outer annular insert having a first diameter and an inner annular insert having a second diameter smaller than the first diameter. An elastomeric body includes an overmoulded outer portion at the outer annular insert and a seal

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2/16 internal overmoulded at the internal annular insertion and including an intermediate web extending between the outer portion and the inner portion. The web extends both axially and radially in relation to a central geometric axis of the external annular insertion. The inner seal includes an inner seal surface and the outer portion including an outer seal surface. The seal provides reduced installation and removal force requirements and improved sealing during cycle tests and thermal cycles. DRAWINGS

[006] The drawings described here are for illustrative purposes only of selected modalities and not of all possible implementations, and are not intended to limit the scope of this description.

[007] Figure 1 is a cross-sectional view of a low load dual insertion displacement seal in accordance with the principles of the present description.

[008] Figure 2 is a cross-sectional view of a second modality of double low-load insertion displacement sealing according to the principles of the present description.

[009] Figure 3 is a perspective view of a support ring in accordance with the principles of the present description.

[0010] Figure 4 is a cross-sectional view of a third modality of the low load displacement seal according to the principles of the present description.

[0011] Figures 5A and 5B illustrate the low load displacement seal of Figure 1 with the representation of Figure 5B showing the seal in an offset position.

[0012] Figures 6A and 6B individually reveal cross-sectional views of the low load displacement seal shown in Figure 4 with the illustration of Figure 6B of the seal being in

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3/16 an offset position.

[0013] Figure 7 is a cross-sectional view of a fourth modality of a low load dual insertion displacement seal according to the principles of the present description.

[0014] Figure 8 is a cross-sectional view of a fifth modality of a low load dual insertion displacement seal according to the principles of the present description.

[0015] Figure 9 is a cross-sectional view of a sixth modality of a low load dual insertion displacement seal according to the principles of the present description, illustrated in the displaced position.

[0016] Figure 10 is a cross-sectional view of the low load double insertion displacement seal of Figure 8, illustrated in an offset position.

[0017] Figure 11 is a cross-sectional view of a seventh modality of a low load double insertion displacement seal according to the principles of the present description illustrated in an offset position; and

[0018] Figure 12 is a cross-sectional view of an eighth modality of a low load double insertion displacement seal according to the principles of the present description illustrated in an offset position.

[0019] Corresponding reference numerals indicate corresponding parts in all the various views of the drawings.

DETAILED DESCRIPTION

[0020] Example modalities will now be described more fully with reference to the attached drawings.

[0021] The sample modalities are provided so that this description is complete, and will fully convey the scope to those who are versed in the technique. Numerous specific details

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4/16 physics are set out as examples of specific components, devices and methods, to provide a complete understanding of the modalities of the present description. It will be evident to those skilled in the art that specific details do not need to be employed, that example modalities can be incorporated in many different ways and that none should be construed as limiting the scope of the description. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0022] The terminology used here is for the purpose of describing specific example modalities only and is not intended to be limiting. As used here, singular forms one, one and o, a may be intended to include plural forms as well, unless the context clearly indicates otherwise. The terms comprise, comprising, including and having are inclusive and therefore specify the presence of aspects, integers, steps, operations, elements and / or components mentioned, but do not prevent the presence or addition of one or more other aspects, integers , stages, operations, elements, components and / or groups thereof. The method steps, processes, and operations described here are not to be construed as necessarily requiring their execution in the specific order discussed or illustrated, unless specifically identified as an order of execution. It should also be understood that alternative or additional steps can be employed.

[0023] When an element or layer is mentioned as being in, coupled with, connected to or coupled to another element or layer, it can be directly in engaged, connected or coupled to the other element or layer, or intermediate elements or layers may be present . On the contrary, when one he

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5/16 ment is mentioned as being directly in, directly engaged in, directly connected in, or directly coupled to another element or layer, there can be no intermediate elements or layers present. Other words used to describe the relationship between elements must be interpreted in a similar way (for example, between versus directly between, adjacent versus directly adjacent, etc.). As used herein, the term and / or includes any and all combinations of one or more of the associated listed items.

[0024] While the terms first, second, third, etc., can be used here to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by those terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Terms such as first, second and other numeric terms when used here do not indicate a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be called a second element, component, region, layer or section without departing from the teachings of the example modalities.

[0025] Spatially relative terms, such as internal, external, below, below, lower, above, upper and similar, can be used here for ease of description to describe an element or aspect relation with other element (s) or aspect (s) as illustrated in the Figures. Especially relative terms may be intended to cover orientations other than the device in use or operation in addition to the orientation represented in the Figures. For example, if the device in the Figures is turned, elements described as

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6/16 below or below other elements or aspects would then be oriented above the other elements or aspects. Thus, the example term below can cover both an upward and downward orientation. The device can be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially related descriptors used here interpreted accordingly.

[0026] With initial reference to Figures 1, 5A and 5B, an arrangement to seal an annular space is shown. The arrangement generally includes a seal 12 arranged in a defined annular space between an inner element 16 and an outer element 18. During operation, the seal 12 engages respective sealing surfaces 22 and 24 with the inner and outer elements 16 and 18, respectively, in an assembled position. For purposes of discussion, the inner element 16 will be mentioned here as an axis, while the outer element 18 will be mentioned here as a hole. It is recognized that although the specific examples provided here refer to an axis and bore arrangement, the teachings may be similarly applicable to other sealing arrangements and are not limited to an axis and bore arrangement, as described here.

[0027] With specific reference now to Figure 1, seal 12 will be described in more detail. In general, the seal 12 includes an outer portion 30, an inner seal 32 and an intermediate web 34 extending between the outer portion 30 and the inner seal 32. The outer portion 30 is radially displaced outwardly with respect to the inner seal 32. The outer portion 30 defines an outer sealing surface 36 for engaging the sealing surface 24 of the hole 18 in an installed position. Similarly, the inner seal 32 defines an inner seal surface 38 to engage the seal surface 22 of the shaft or other element 16 in an installed position. The outer and inner sealing surfaces 36 and 38 of the seal 12 can be

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7/16 made of an elastomeric material such as rubber, although other materials can be used. The outer sealing surface 36 of the seal 12 generally defines a cylindrical face. The sealing surface 36 can include sealing ribs 40 therein to increase its sealing and retaining properties. The inner sealing surface 38 of the seal 12 can be arranged on a flap 42 which will be described in more detail here. The weft portion 34 is adapted to flex to accommodate the inner seal being radially displaced with respect to the outer portion 30 so that the inner seal 32 can maintain contact with the inner element 16 after movement of the inner element 16 with respect to the outer element 18 .

[0028] The outer portion 30 of the seal 12 includes an outer annular insertion ring 44 disposed thereon. The inner seal 32 of the seal 12 includes an inner annular insertion ring 46 disposed thereon. Annular insertion rings 44 and 46 can be made of a rigid material such as metal, although other rigid materials can be used. Annular insertion rings 44 and 46 provide rigidity to the respective outer portion 30 and inner seal 32 and seal 12 as a whole.

[0029] The flap 42 of the inner seal 32, in an un-installed condition, can extend at an angle relative to the overmolded insertion ring 46 and in a mounted position, is arranged in a gap 48 between a spring portion 49 defined by the ring overmolded insert 46 and shaft 16. The insert ring 46 partially loads the spring portion 49 and flap 42 in the assembled position, generically illustrated in Figure 5A. The angle and thickness of the flap 42 can vary depending on the required sealing force as well as the loading forces required for installation on the shaft 16. The geometry of the flap 42 can allow easy filling during the molding process and for removing the mold. In addition, the flap 42 can include multiple friezes of

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8/16 50 seal which may vary in shape and size. The clearance 48 disposed between the spring portion 49 and the shaft 16 provides limited space for compression of the flap 42 between them. The flap 42 allows a reduction in the rubber tension compared to a solid rubber crimp and allows the inner seal 32 to follow the axis 16 under a thermal cycle from hot to cold and vice versa and due to another movement such as vibration and part displacement for part. This provides improved axis tracking capability compared to previous designs. Flap 42 lowers the material's elastomer stress limit by creating two separate spring elements (i.e., two elastomer elements), compared to current designs with a spring element.

[0030] With continuous reference to Figures 1, 5A and 5B, the weft portion 34 of the seal 12 extends both axially and radially with respect to a central geometric axis A1 of the outer portion 30 to accommodate angular and lateral movement of the axis 16 with respect to to a geometric axis of the hole 18 while maintaining a seal at an interface between the inner sealing surface 38 of the seal 12 and the sealing surface 22 of the axis 16. In Figure 5B, the axis 16 is shown moved from a central geometric axis A1 laterally to the right for an offset A2 axis. The inner seal 32 of the seal 12 moves complementary to the movement of the shaft 16. To maintain an interface between the seal 12 and the shaft 16, the intermediate web 34 stretches in a first portion and deforms in an opposite portion. It is recognized that the intermediate web 34 may comprise a fine web between the outer portion 30 and the inner seal 32 to accommodate additional deflection and / or rotation of the shaft 16. Although the seal 12 is shown deflected laterally it is recognized that the seal 12 can experience one of lateral deflection or possibly rotation in the installed position or alternatively, do not experiment

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9/16 no movement. The design of the present application allows for greater movement or misalignment between the shaft and the bore compared to current designs while still maintaining low installation forces. The seal 12 can be compactly designed with the inner seal 32 being arranged entirely axially between opposite ends of the outer annular insert 44.

[0031] With reference now to Figure 2, an arrangement for sealing an annular space in accordance with additional aspects is shown. The arrangement generally includes a seal 112 arranged in a defined annular space between an inner element 16 and an outer element 18. During operation, the seal 112 engages respective sealing surfaces 22 and 24 with the inner and outer elements 16 and 18, respectively, in an assembled position.

[0032] With specific reference now to Figure 2, seal 112 will be described in more detail. In general, seal 112 includes an outer portion 130, an inner seal 132, and an intermediate weft portion 134 extending between outer portion 130 and inner seal 132. Outer portion 130 is radially displaced outwardly relative to the inner seal 132. The outer portion 130 defines an outer sealing surface 136 for engaging the sealing surface 24 of hole 18 in an installed position. Similarly, the inner seal 132 defines an inner seal surface 138 to engage the seal surface 22 of the shaft 16 in an installed position. The intermediate web 134 generally defines a web portion extending between the outer portion 130 and an inner seal 132. The inner and inner seal surfaces 136 and 138 of the seal 112 may be made of an elastomeric material such as rubber, although other materials may be used. The outer sealing surface 136 of the seal 112 generally defines a cylindrical face. The sealing surface 136 may include sealing moldings 140 in the same

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10/16 ma. The inner sealing surface 138 of the seal 112 is arranged on a flap 142 which will be described in more detail here. The intermediate web 134 and inner seal 132 are adapted to deflect with the inner element 16 and maintain contact with the inner element 16 after movement of the inner element 16 in relation to the outer element 18.

[0033] The outer portion 130 of the seal 112 includes an outer annular insertion ring 144 disposed thereon. The inner seal 132 of the seal 112 includes a second annular insertion ring 146 disposed thereon. Ring rings 144 and 146 can be made of a rigid material such as metal. Annular rings 144 and 146 provide rigidity for the respective outer portion 130 and the inner seal 132 and for the seal 112 as a whole. The inner annular insertion ring 146 may include an axially extended cylindrical leg 146a and a radially inward extended leg 146b that extends towards axis 16 and having an inner diameter that prevents excessive internal sealing movement at extreme displacement. The radially inward extended leg 146b may include a series of spaced tabs 156. The radially inward extended leg 146b may include a series of spaced tabs 156. The radially inward extended leg 146b can be axially spaced from flap 142 and limits movement of the internal seal 132 in relation to the axis 16 to avoid excessive load on the flap 142.

[0034] The flap 142 of the inner seal 132 can extend at an angle to the cylindrical leg 146a of the overmolded insertion ring 146 and in an assembled position, is arranged in a gap 148 between a spring portion 149 defined by the overmolded cylindrical leg 146a and the axis 16. The axially extended leg 146a partially bears the spring portion 149 and flap 142 in the assembled position. The angle of the flap 142 (shown in the unmounted position in Figure

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11/16

2) may vary depending on the required sealing force as well as the loading forces required for installation on the shaft 16. The geometry of the flap 142 can allow ease of filling during the molding process and for mold removal. In addition, flap 142 may include multiple sealing strips 150 which may vary in shape and size. The gap 148 disposed between the spring portion 149 and the shaft 16 provides limited space for compression of the flap 142 between them. The flap 142 allows a reduction in the rubber tension compared to a solid rubber crimp and allows the internal seal 132 to follow the axis 16 under a thermal cycle from hot to cold and vice versa and due to other movements such as vibration and part displacement for part. This design provides the same benefits as the design in Figure 1 while limiting the amount of compression of the spring elements.

[0035] With continuous reference to Figure 2, the seal 112 accommodates lateral and angular movement of the axis 16 with respect to a geometric axis of the hole 18 while maintaining a seal at an interface between the inner seal surface 138 of the seal 112 and the surface seal 22 of shaft 16. As shown in Figure 5B, the inner seal 132 of seal 112 moves complementary to the movement of shaft 16. To maintain an interface between seal 112 and shaft 16, the intermediate web 134 stretches into a first portion and deforms in an opposite portion. It is recognized that the intermediate web 134 may comprise a fine web between the outer portion 130 and the inner seal 132 to accommodate additional deflection and / or possibly rotation of the axis 16.

[0036] With reference now to Figure 4, an arrangement for sealing an annular space in accordance with additional aspects is shown. The arrangement generally includes a seal 212 arranged in a defined annular space between an inner element 16 and an outer element

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12/16

18. During operation, seal 212 engages respective sealing surfaces 22 and 24 to the inner and outer elements 16 and 18, respectively, in an assembled position.

[0037] With specific reference now to Figure 4, the seal 212 will be described in more detail. In general, seal 212 includes an outer portion 230, an inner seal 232, and an intermediate web 234 extending between outer portion 230 and inner seal 232. The outer portion 230 is radially displaced outwardly with respect to inner seal 232. The outer portion 230 defines an outer sealing surface 236 for engaging the sealing surface 24 of the hole 18 in an installed position. Similarly, the inner seal 232 defines an inner seal surface 238 to engage the seal surface 22 of the shaft 16 in an installed position. The intermediate portion 234 generically defines a frame extending between the outer portion 230 and inner seal 232.

[0038] The outer and inner sealing surfaces 236 and 238 of seal 212 may be made of an elastomeric material such as rubber, although other materials may be used. The outer sealing surface 236 of the seal 212 generally defines a cylindrical face. The sealing surface 236 may include sealing ribs 240 thereon. The inner sealing surface 238 of seal 212 includes an angularly arranged sealing ferrule 242a and a sealing lip 242b. The intermediate web 234 and the inner seal 232 are adapted to deflect with the inner element 16 and maintain contact with the inner element 16 after movement of the inner element 16 in relation to the outer element 18.

[0039] The outer portion 230 of the seal 212 includes an external annular insertion ring 244 disposed thereon. The inner seal 232 of the seal 212 includes an inner annular insert ring 246 disposed thereon. The annular insertion rings 244 and 246 can be of one

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13/16 rigid material, such as metal, although other rigid materials can be used. Annular rings 244 and 246 provide rigidity to the respective outer portion 230 and inner seal 232 and to seal 212 as a whole. The inner annular insertion ring 246 can include an axially extending cylindrical leg 246a and a radially inward extending leg 246b that extends towards axis 16 and having an inner diameter that prevents internal sealing movement at extreme displacement. The radially inwardly extended leg 246b may include a series of spaced tabs in the same manner as shown in Figure 3. The radially inwardly extended leg 246b limits movement of the inner seal 232 with respect to the axis 16 to avoid excessive load on the sealing ferrule at an angle arranged 242a and sealing lip 242b. The radially inwardly extended leg 246b can be arranged axially between the angularly arranged sealing ferrule 242a and the sealing lip 242b.

[0040] The angled sealing ferrule 242a of the inner seal 232 can extend at an angle to the cylindrical leg 246a of the overmoulded insert ring 246. The angle of the sealing ferrule 242a can vary depending on the required sealing force as well as the loading forces required for installation on the shaft 16. The sealing lip 242b can be arranged radially into the axially extended leg 246a of the insert ring 246 and can have a geometry to allow ease of filling during the molding process and for removal of mold. The sealing lip 242b is partially loaded by the axially extended leg 246a and is located radially outwardly therefrom.

[0041] With continuous reference to Figures 4, 6A and 6B, the seal 212 accommodates lateral and angular movement of the axis 16 in relation to a geometric axis of the hole 18 while maintaining a seal at an interface between the inner seal surface 238 of the seal 212 and

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14/16 the sealing surface 22 of the shaft 16. As shown in Figure 6B, the inner seal 232 of the seal 212 moves complementary to the movement of the shaft 16. To maintain an interface between seal 212 and shaft 16, the intermediate web 234 stretches in a first portion and deforms in an opposite portion. It is recognized that the intermediate web 234 may comprise a fine web between the outer portion 230 and the inner seal 232 to accommodate additional deflection and / or rotation of the shaft 16. Although seal 212 is shown deflected laterally it is recognized that seal 212 may experience one with lateral deflection or possibly rotation in the installed position or alternatively, do not experience any movement.

[0042] Figure 7 is a cross-sectional view of a 312 low load dual insert displacement seal according to the principles of the present description. The seal 312 includes an inner and an outer seal 330, 332 connected by a weft portion 334. The inner and outer seals each include an annular insert ring 336, 338. The inner seal includes a flap 342 having a smooth inner surface ( although an annular or textured ribbed surface can be used) that engages the outer surface 22 of the inner element 16 to be sealed. The inner annular insertion ring 336 may be provided with a radially inwardly extended flange 340 located adjacent to a pivot point of the flap 342. The outer surface 344 of the flap 342 may be provided with one or more raised grooves 352 which provide a spring effect to prop the flap 342 against the inner element 16 being sealed. The web 334 can accommodate radial displacement between the internal and external elements 16, 18.

[0043] Figure 8 is a cross-sectional view of a second low load dual insert displacement seal type 412 (in an unmounted state) according to the principles

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15/16 principles of this description. The seal 412 includes an inner and an outer seal 430, 432 connected by a weft portion 434. The inner and outer seals 430, 432 each include an annular insert ring 436, 438. The inner seal 430 includes a flap 442 having a smooth inner surface (although an angular or textured ribbed surface can be used) that engages the outer surface 22 of an annular element 16 to be sealed. The inner annular insertion ring 436 may be provided with a radially inwardly extended flange 440 located distal from a pivot point of the flap 442. The outer surface of the flap 442 may be provided with one or more embossed strips 452 which provide an effect spring-loaded to prop the flap against the inner element being sealed. Figure 10 shows the seal of Figure 8 in an assembled condition that accommodates a displacement between an internal and an external element being sealed. Figure 9 shows a seal similar to the seal in Figures 8 and 10 with a single frieze 452 on the outer surface of the flap 442. The web 434 can accommodate radial displacement between the inner and outer elements 16, 18.

[0044] Figure 11 is a cross-sectional view of a third modality of the low load displacement seal 512 (in an assembled state) according to the principles of the present description. Seal 512 includes an inner and an outer seal 530, 532 connected by a weft portion 534. Weft portion 534 extends diagonally between opposite ends of the inner and outer seals 530, 532. The inner and outer seals 530, 532 each include an annular insertion ring 536, 538. Inner seal 530 includes a tab 542 having a smooth inner surface (although an annular or textured ribbed surface 548 can be used, as shown in Figure 12) that engages outer surface 22 of a inner element 16 to be sealed. The inter annular insertion ring

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16/16 no 536 can optionally be provided with a flange extending radially inward 550 (Figure 6) located distal to or adjacent to the pivot point of the flap 542. Omitting the flange 550, as shown in Figure 5 can reduce the force of assembly required on the inner element 16. The outer surface of the flap 542 can be provided with one (Figure 5) or more (Figure 6) embossed ribs 552 that provide a spring effect to prop the flap 542 against the inner element 16 being sealed . The web 534 can accommodate radial displacement between the internal and external elements 16, 18.

[0045] The above description of the modalities has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention. Individual elements or aspects of a specific modality are not generally limited to that specific modality, however, where applicable, they are interchangeable and can be used in a selected modality even if not specifically shown or described. It can also be varied in many ways. Such variations should not be considered a departure from the invention and all such modifications are intended to be included in the scope of the invention.

Claims (17)

1. Sealing system characterized by the fact that it comprises: an outer element (18) defining a hole; an internal element (16) received in the hole; an external annular insert having a first diameter; an internal annular insert having a second diameter smaller than said first diameter; and a unitary elastomeric body including an outer portion (30, 130) overmoulded at said external annular insert and an inner portion defining an overmoulded seal at said internal annular insert and including an intermediate web (34) extending between said outer portion (30 , 130) and said internal portion, said intermediate web (34) extending both axially and radially with respect to a central geometric axis of said external annular insert, said sealing of said internal portion of said elastomeric body including a surface of inner seal (38) in direct engagement with the inner element (16) and said outer portion (30, 130) of said elastomeric body including an outer seal surface (36) in direct engagement with an inner surface of the bore of the outer element (18), in which an annular space is defined between said overmoulded internal annular insert and said internal element (16), wherein said internal seal includes an annular flap (42, 142 ) which, in an un-installed condition, extends at an angle relative to said annular insertion and, in an installed position, is arranged in the annular space between the annular insertion and said internal element (16), and the annular space provides space limited so that an entire circumference of the annular flap (42, 142) is compressed by said internal annular insert against the inner element (16), said annular flap (42, 142) including at least one embossed rib on an outer surface the same. Petition 870190074415, of 08/02/2019, p. 20/28 2/5 2. Sealing system according to claim 1, characterized in that said external portion (30, 130) of said elastomeric body includes at least one sealing lip (40, 50, 140, 150) extending radially out from it. 3. Sealing system according to claim 1, characterized by the fact that said annular flap (42, 142) includes at least one sealing strip (40, 50, 140, 150) on an internal surface thereof. 4. Sealing system according to claim 3, characterized in that said annular flap (42, 142) includes a hinge portion connected at a junction between said overmolded internal annular insert and said intermediate web (34 ). 5. Sealing system according to claim 1, characterized in that said internal annular insertion includes an axially extended leg and a radially extended inward leg extending from one end of said axially extended leg. 6. Sealing system according to claim 5, characterized in that said leg extended radially into said internal annular insert is disposed adjacent to a distal end of said annular flap (42, 142). 7. Sealing system characterized by the fact that it comprises: an outer element (18) defining a hole; an internal element (16) received in the hole; an external annular insert (44) having a first diameter; an internal annular insert having a second diameter smaller than the first diameter; and a unitary elastomeric body including an external portion 870190074415, of 8/2/2019, p. 21/28 3/5 in the overmoulded (30, 130) at said outer annular insert (44) and an overmoulded internal seal at said inner annular insert and including an intermediate web (34) extending between said outer portion (30, 130) and the said inner portion, said web extending both axially and radially with respect to a central geometric axis of said outer annular insert (44), said inner seal including an inner sealing surface (38) and said outer portion (30, 130) including an external sealing surface (36), in which an annular space is defined between said overmolded internal annular insert and said internal element (16), in which said internal seal includes an annular flap (42, 142) which in an installed position is arranged in the annular space between the inner annular insert and the inner element (16), and the annular space provides limited space so that an entire circumference of the annular flap (42, 142) is compressed between said insertion internal annul and the inner element (16), said inner annular insert includes an axially extending leg (146a) and a radially inward extending leg (146b) extending from one end of said axially extending leg, said radially extending leg said internal annular insert is disposed adjacent to a distal end of said annular flap (42, 142). Sealing system according to claim 7, characterized in that said outer portion (30, 130) of said elastomeric body includes at least one sealing lip (40, 50, 140, 150) extending radially out from it. 9. Sealing system according to claim 7, characterized in that said annular flap (42, 142) includes at least one frieze on an internal surface thereof. 10. Sealing system according to claim 9, characterized by the fact that said annular flap (42, 142) includes a Petition 870190074415, of 08/02/2019, p. 22/28 4/5 portion of articulation connected at a junction between said overmolded internal annular insert and said intermediate frame (34). 11. Sealing system characterized by the fact that it comprises: an outer element (18) defining a hole; an internal element (16) received in the hole; an external annular insert (44) having a first diameter; an internal annular insert having a second diameter smaller than the first diameter; and a unitary elastomeric body including an outer portion (30, 130) overmoulded at said external annular insert (44) and an internal overmolded seal at said internal annular insert and including an intermediate web (34) extending between said outer portion (30 , 130) and said inner portion, said web extending both axially and radially with respect to a central geometric axis of said outer annular insert (44), said inner seal including an inner seal surface (38) and said outer portion (30, 130) including an outer sealing surface (36), wherein an annular space is defined between said overmolded inner annular insert and said inner element (16), wherein said inner seal includes an annular flap (42, 142) which in an installed position is arranged in the annular space between the inner annular insert and the inner element (16), and the annular space provides limited space so that an entire circumference of the annular flap (42, 142) is compressed between said internal annular insert and the internal element (16), said intermediate web (34) extending diagonally between opposite ends of the external and internal seals. 12. Sealing system, according to claim 11, characterized by the fact that said external portion (30, 130) of said Petition 870190074415, of 08/02/2019, p. 23/28 5/5 elastomeric body includes at least one sealing lip (40, 50, 140, 150) extending radially outwardly thereto. 13. Sealing system according to claim 11, characterized in that said annular flap (42, 142) includes at least one sealing lip (40, 50, 140, 150) on an internal surface thereof. 14. Sealing system according to claim 11, characterized by the fact that said annular flap (42, 142) includes at least one embossed frieze on an external surface thereof. 15. Sealing system according to claim 11, characterized in that said annular flap (42, 142) includes a hinge portion connected at a junction between said overmolded inner annular insert and said intermediate web (34 ). 16. Sealing system according to claim 11, characterized in that said internal annular insert includes an axially extending leg (146a) and a radially inward extending leg (146b) extending from one end of said axially extended leg (146a). 17. Sealing system according to claim 16, characterized in that said leg radially extended inwards (146b) of said internal annular insert is disposed adjacent to an end close to said annular flap (42, 142).