CN110762218A

CN110762218A - Sealing ring

Info

Publication number: CN110762218A
Application number: CN201810837609.2A
Authority: CN
Inventors: 刘鑫; 张岳林; 乌维·尼伯林; 吴寒
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2018-07-26
Filing date: 2018-07-26
Publication date: 2020-02-07
Anticipated expiration: 2038-07-26
Also published as: CN110762218B

Abstract

The invention relates to a sealing ring having an annular sealing body (3) made of an elastic material and a supporting web (5) embedded in the sealing body (3), wherein the sealing body (3) has a sealing lip (4) which forms a dynamic seal with a sealing surface (2), wherein the web (5) extends along the shape of the sealing body (3), and the web (5) has a structural elasticity by its own structure, so that the web (5) can support the sealing body (3) and at the same time can press the sealing lip (4) against the sealing surface (2).

Description

Sealing ring

Technical Field

The invention relates to a sealing ring for dynamic sealing, comprising an elastic sealing body and a framework embedded in the sealing body.

Background

The conventional seal ring is mainly composed of a seal body made of an elastic material such as rubber. A reinforcing skeleton is often provided in the sealing body so that the sealing body can maintain its shape and tension. In addition, in a sealing ring for sealing a shaft, a self-tightening coil spring is often provided for providing a radial force for pressing a sealing lip of a sealing body against the shaft.

In practice, however, it is often not possible to arrange a self-tightening coil spring on the sealing lip because of the limited installation space. Therefore, when the seal ring is assembled to the housing ring and the shaft member, the seal lip can be pressed against the shaft member only by its own pressure. This sealing method is only suitable for sealing grease and does not seal oil well. In addition, when the sealing body is made of an elastic material having a poor compression resilience, such as Ethylene Propylene Diene Monomer (EPDM), the sealing body, particularly, the sealing lip, is compressed to cause a leakage failure at the sealing portion, and therefore, in the case where the self-tightening coil spring cannot be provided, the sealing body is made of an elastic material having a better use performance, and the cost of the seal ring is increased.

Chinese utility model patent CN 203686152U discloses a sealing ring with a built-in coil spring, wherein the coil spring is integrated at the sealing lip. However, in this case, the coil spring cannot support the seal lip well, and a separate frame must be provided in the seal body. Furthermore, the provision of the coil spring does not advantageously reduce the size of the seal ring, so that it is not possible to arrange such a seal ring in a small space.

Disclosure of Invention

The object of the present invention is therefore to provide a sealing ring which has good sealing properties, can be used for sealing oil, is low in cost and can be used in particular in the case of small installation spaces.

The object is achieved by a sealing ring having an annular sealing body made of an elastic material and a supporting framework embedded in the sealing body, wherein the sealing body has a sealing lip which forms a dynamic seal with the sealing surface. According to the invention, the frame extends along the shape of the sealing body and the frame is structurally elastic by its own structure, i.e. the frame is made to have elastic properties as a whole not primarily by its material properties but by its own structural features, so that the frame is able to support the sealing body and at the same time to press the sealing lip against the sealing surface.

In the present invention, the sealing surface may be an outer peripheral surface of a rotating body, and the rotating body may be, for example, a cylindrical body, a circular truncated cone, a hollow cylinder, or the like. The body of revolution can be rotary or stationary, provided that the sealing surfaces or surfaces of revolution have a movement in the circumferential direction relative to the sealing device. The sealing ring can be fixed on the housing, for example in the case of a bearing, the sealing ring being fixed on the bearing outer ring, the sealing lip of the sealing ring dynamically sealing the shaft which cooperates with the bearing. The elastic material of which the sealing body is made is, for example, rubber, and even ethylene propylene diene monomer, which is inexpensive but has poor compression resilience. The skeleton can be composed of metal. The shape of the whole framework is matched with that of the sealing body. If the sealing body has, for example, a relatively long axial lip, so that the sealing body forms a rubber ring with a C-shaped cross section, the carcass is overall in a circumferential C-shape, and if the sealing lip of the sealing body extends substantially radially, so that the sealing body forms a rubber ring with an L-shaped cross section, the carcass is overall in a circumferential L-shape. The skeleton has structural elasticity through self structure to integrated transmission skeleton and the tradition function from the spring of screwing, consequently the skeleton can support the seal and can compress tightly the seal lip on sealed face simultaneously.

In a preferred embodiment, the carcass has a plurality of curved sections which are spaced apart from one another and which match the shape of the sealing body, the curved sections being distributed along the circumference of the sealing body, wherein the curved sections have two free ends which are each connected to a free end of a different adjacent curved section, forming a structurally resilient carcass. The curved portion can extend in a plane passing through the axis of rotation of the sealing ring, and can also extend obliquely to this plane. The radially outer free end of a curved section is connected to the radially outer free end of an adjacent curved section, and the radially inner free end of this curved section is connected to the radially inner free end of another adjacent curved section, so that the curved sections are connected to form a closed whole, i.e. without a remaining free end. Thus, the armature has an even number of curved sections, and the armature has at least four curved sections. The framework with structural elasticity formed in this way can both support the sealing body and press the sealing lip against the sealing surface.

Advantageously, the two free ends of a curved section are each connected to the free ends of different adjacent curved sections by a circumferential section extending in the circumferential direction of the sealing body. The circumferential section can be a straight or an arc section. Alternatively, the two free ends of a curved section can also be directly connected to the free ends of different adjacent curved sections, respectively. Alternatively, the free ends of adjacent curved sections to be connected can be connected radially on the outside by a circumferential section and directly on the inside, or the free ends of adjacent curved sections to be connected can be connected radially on the outside and directly on the inside by a circumferential section. Therefore, reliable elastic force of the framework can be guaranteed, the sealing lip is further guaranteed to be pressed on the sealing surface constantly, and oil liquid is reliably sealed.

In a particularly advantageous embodiment, the curved section has a C-shape with two axial sections and a radial section connecting the two axial sections, the free ends of the two axial sections being connected to the free ends of the axial sections of different adjacent curved sections by a circumferential section, so that the carcass as a whole also has a circumferential C-shape. Such a framework is suitable, for example, for sealing rings whose sealing body has a relatively long axial lip.

In a further particularly advantageous embodiment, the curved section is L-shaped, the curved section has only one axial section and one radial section, and the radial section is connected to the axial section at a radially outer end, the free ends of the axial section and of the radial section being connected to the free ends of the axial section and of the radial section of different adjacent curved sections, respectively, by means of a circumferential section, so that the carcass as a whole also has a circumferential L-shape. Such a frame is suitable, for example, for a sealing ring whose sealing lips extend substantially in the radial direction.

In another preferred embodiment, the spacing between adjacent curved sections is equal. So that the radial force pressing the sealing lip against the sealing surface can be uniformly provided.

In another preferred embodiment, the skeleton is embedded in the seal by a vulcanization process. The sealing body and the framework can be reliably and tightly connected through the vulcanization process. In addition, the framework has a complex structure, and the vulcanization process can meet the requirement of reliable connection without additionally increasing excessive cost.

In another preferred embodiment, the skeleton is made of spring wire. Therefore, the sealing performance of the sealing ring is improved and the service life of the sealing ring is prolonged through the good comprehensive performance of the spring wire.

Advantageously, the cross-section of the spring wire is circular or square. Thereby facilitating manufacture.

Advantageously, the skeleton is made of spring wire by winding and punching, or by one step of winding. In the former, it is possible, for example, to wind a spring wire into a serpentine-like shape, then to bend this serpentine spring circumferentially into a loop and connect the two free ends, and finally to punch and bend it into, for example, a C-or L-shaped loop. In the latter, the skeleton can be rapidly manufactured in one process.

Thus, the seal ring according to the present invention can advantageously save costs, save layout space, improve sealing performance, and even seal oil without an additional spring.

Drawings

Preferred embodiments of the present invention are schematically illustrated in the following with reference to the accompanying drawings. The attached drawings are as follows:

figure 1 is a semi-sectional view of a seal ring according to a first preferred embodiment of the invention,

figure 2 is a perspective view of the skeleton of the sealing ring according to figure 1,

FIG. 3 is a perspective view of a skeleton of a seal ring according to a second preferred embodiment of the present invention, an

Fig. 4 is a perspective view of a skeleton of a seal ring according to a third preferred embodiment of the present invention.

Detailed Description

Fig. 1 shows a half-sectional view of a seal ring according to a first preferred embodiment of the present invention. The seal ring is used for sealing the bearing. The sealing ring is overall in the form of a circumferential C and has an annular sealing body 3, which is made of rubber and has a sealing lip 4, and a carcass 5 embedded in the sealing body 3 by means of a vulcanization process. The seal ring is fixed to the bearing outer ring 1 by its seal body 3, and the seal lip 4 of the seal ring dynamically seals the outer peripheral surface 2, i.e., the seal face, of the shaft that is fitted to the bearing.

Fig. 2 shows a perspective view of the skeleton of the sealing ring according to fig. 1. As shown, the skeleton 5 is entirely in the shape of a surrounding C and is made of a spring wire having a circular cross section. The carcass 5 has a plurality of curved sections distributed along the circumference of the sealing body 3, the curved sections being spaced apart from each other and equally spaced. The curved section matches the shape of the sealing body 3 and is thus C-shaped. The curved section has an outer axial section 6, an inner axial section 8 and a radial section 7 connecting the two

axial sections

6, 8. The curved section has two free ends on the outer axial section 6 and the inner axial section 8, respectively. The free end of the outer axial section 6 of a bend is connected to the free end of the outer axial section of an adjacent bend by an outer axial section 9, and the free end of the inner axial section 8 of the bend is connected to the free end of the inner axial section of another adjacent bend by an inner circumferential section 10. The framework 5 can thus support the sealing body 3 and at the same time can press the sealing lip 4 against the sealing surface 2.

Fig. 3 shows a perspective view of the skeleton of a seal ring according to a second preferred embodiment of the present invention. As shown, the framework 5 'is similar to the framework 5 of the first preferred embodiment, and is also used for a seal ring having an overall circumferential C-shape, so that the framework 5' has an overall circumferential C-shape. However, in the present embodiment, the bobbin 5' is made of a spring wire having a square cross section. The framework 5' can also support the sealing body 3 and at the same time can press the sealing lip 4 against the sealing surface 2.

Fig. 4 shows a perspective view of the skeleton of a seal ring according to a third preferred embodiment of the present invention. As shown, the skeleton 5 "is entirely in the shape of a surrounding L and is made of a spring wire having a circular cross section. In further alternatives, other shapes of cross-section are also possible. Such a skeleton 5 "can be used for sealing rings with sealing lips extending substantially radially. The skeleton 5 "has a plurality of curved sections distributed along the circumference of the sealing body, the curved sections being spaced apart from each other and equally spaced. The bending section has an outer axial section 6 ″ and a radial section 7 ″, wherein the radial section 7 ″ is connected at its radially outer end to the outer axial section 6 ″. The curved section has two free ends on the outer axial section 6 "and the radial section 7", respectively. The free end of the outer axial section 6 "of a curved section is connected to the free end of the outer axial section of an adjacent curved section by an outer axial section 9", and the free end of the radial section 7 "of this curved section is connected to the free end of the radial section of another adjacent curved section by an inner circumferential section 10". The framework 5 "is thus able to support the sealing body and at the same time to press the sealing lip against the sealing surface.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.

List of reference numerals

1 bearing outer ring

2 axle

3 sealing body

4 sealing lip

5; 5'; 5' framework

6; 6'; 6' outer axial section

7; 7'; 7' radial segment

8; 8' inner axial section

9; 9'; 9' outer circumferential section

10; 10'; 10' inner circumferential section

Claims

1. A sealing ring having an annular sealing body (3) made of an elastic material and a supporting framework (5; 5') embedded in the sealing body (3), wherein the sealing body (3) has a sealing lip (4) forming a dynamic seal with a sealing surface (2),

the sealing element is characterized in that the framework (5; 5 ') extends along the shape of the sealing body (3), and the framework (5; 5 ') has a structural elasticity due to its own structure, so that the framework (5; 5 ') can support the sealing body (3) and at the same time can press the sealing lip (4) against the sealing surface (2).

2. A sealing ring according to claim 1, characterized in that the carcass has a plurality of mutually spaced curved sections matching the shape of the sealing body (3), said curved sections being distributed along the circumference of the sealing body (3), wherein the curved sections have two free ends, which are connected to the free ends of different adjacent curved sections, respectively, forming a carcass having structural elasticity.

3. A seal ring according to claim 2, characterized in that the two free ends of the curved sections are each connected with the free end of a different adjacent curved section by a circumferential section (9, 10; 9 ', 10'; 9 ", 10") extending in the circumferential direction of the seal body (3).

4. A ring seal according to claim 3, characterized in that the bending section is C-shaped, having two axial sections (6, 8; 6 ', 8') and a radial section (7; 7 ') connecting the two axial sections (6, 8; 6', 8 '), the free ends of the two axial sections (6, 8; 6', 8 ') being connected to the free ends of the axial sections of different adjacent bending sections by the circumferential section (9, 10; 9', 10 '), so that the carcass (5; 5') is overall also C-shaped in a circumferential manner.

5. A ring seal according to claim 3, characterized in that the bending section is L-shaped, the bending section having only one axial section (6 ") and one radial section (7"), and the radial section (7 ") being connected to the axial section (6") at a radially outer end, the free ends of the axial section (6 ") and the radial section (7") being connected to the free ends of the axial section and the radial section, respectively, of different adjacent bending sections by means of the circumferential sections (9 ", 10"), so that the skeleton (5 ") as a whole also has a surrounding L-shape.

6. The seal ring of claim 1, wherein the spacing between adjacent curved segments is equal.

7. A seal ring according to claim 1, characterized in that the skeleton (5; 5'; 5 ") is embedded in the seal body (3) by means of a vulcanization process.

8. A seal ring according to claim 1, characterized in that the skeleton (5; 5'; 5 ") is made of spring wire.

9. The seal ring of claim 8, wherein the cross-section of the spring wire is circular or square.

10. A ring seal according to claim 8, characterized in that the skeleton (5; 5') is made of spring wire by winding and punching, or by one winding step.