CN110762218B

CN110762218B - Sealing ring

Info

Publication number: CN110762218B
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: 2024-04-12
Anticipated expiration: 2038-07-26
Also published as: CN110762218A

Abstract

The utility model relates to a sealing ring comprising an annular sealing body (3) made of an elastic material and a supporting framework (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), wherein the framework (5) extends along the shape of the sealing body (3) and the framework (5) has structural elasticity by its own structure, so that the framework (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 utility model 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 cage is often provided in the seal body so that the seal body can maintain its shape and tension. In addition, self-tightening helical springs are often provided in sealing rings for sealing shafts, for providing a radial force which presses the sealing lip of the sealing body against the shaft.

In practice, however, it is often not possible to arrange a self-tightening helical spring on the sealing lip because of the space limitation. Thus, after the sealing ring has been fitted to the housing ring and the shaft element, the sealing lip can only be pressed against the shaft element 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 poor compression resilience performance, such as Ethylene Propylene Diene Monomer (EPDM), the sealing body, particularly the compression deformation at the sealing lip, may cause leakage failure at the sealing portion, and thus, in the case where the self-tightening coil spring cannot be provided, it is necessary to make the sealing body of an elastic material having better performance, and the cost of the seal ring is increased accordingly.

In chinese patent No. CN 203686152U a sealing ring with a built-in coil spring is disclosed, wherein the coil spring is integrated at the sealing lip. However, in this case, the coil spring cannot well support the seal lip, and a separate bobbin is also required to be provided in the seal body. Furthermore, the provision of a helical spring does not advantageously reduce the size of the sealing ring, so that it is not possible to arrange such a sealing ring in a small space.

Disclosure of Invention

The utility model provides a sealing ring which has good sealing performance, can be used for sealing oil liquid, has low cost and can be particularly used under the condition of smaller arrangement space.

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 utility model, the skeleton extends along the shape of the sealing body and is structurally elastic by its own structure, i.e. the skeleton is made elastic in its entirety not by its own material properties but by its own structural characteristics, so that the skeleton can support the sealing body and at the same time can press the sealing lip against the sealing surface.

In the present utility model, the seal surface may be an outer peripheral surface of a rotary body, and the rotary body may be a cylinder, a truncated cone, a hollow cylinder, or the like. The rotor can be rotatable or stationary, as long as the sealing surface or the surface of the rotor has a circumferential movement relative to the sealing device. The sealing ring can be fixed to the housing, for example in the case of a bearing, the sealing ring being fixed to the bearing outer ring, the sealing lip of the sealing ring dynamically sealing the shaft with which the bearing is fitted. The elastic material constituting the sealing body is, for example, rubber, and even ethylene propylene diene monomer rubber which is low in cost but poor in compression resilience performance can be used. The skeleton can be composed of metal. The shape of the whole framework is matched with the shape of the sealing body. If the sealing body has, for example, a longer axial lip, so that the sealing body forms a rubber ring with a C-shaped cross section, the skeleton is entirely circumferential C-shaped, 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 skeleton is entirely circumferential L-shaped. The skeleton has structural elasticity through self structure to integrated transmission skeleton and traditional function of spinning tight spring, consequently the skeleton can support the seal body and can compress tightly sealing lip on sealed face simultaneously.

In a preferred embodiment, the carcass has a plurality of mutually spaced curved sections matching 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 elastic carcass. The curved section can extend in a plane 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 one adjacent curved section, which is connected to the radially inner free end of the other adjacent curved section, so that the individual curved sections are connected to form a closed whole, i.e. without remaining free ends. Thus, the skeleton has an even number of curved sections, and the skeleton has at least four curved sections. The thus formed structurally elastic skeleton can both support the sealing body and press the sealing lip against the sealing surface.

Advantageously, the two free ends of the curved sections are each connected with the free ends of a different adjacent curved section by a circumferential section extending in the circumferential direction of the sealing body. The circumferential section can be a straight line section or an arc section. Alternatively, the two free ends of the curved sections can also be connected directly to the free ends of different adjacent curved sections, respectively. Alternatively, the free ends of adjacent curved sections to be connected can be connected by circumferential sections on the radially outer side and the free ends of adjacent curved sections to be connected can be directly connected on the radially inner side, or the free ends of adjacent curved sections to be connected can be directly connected on the radially outer side and the free ends of adjacent curved sections to be connected can be connected by circumferential sections on the radially inner side. Therefore, reliable elastic force of the framework can be ensured, the sealing lip is further ensured to be pressed on the sealing surface at any time, and oil is reliably sealed.

In a particularly advantageous embodiment, the bending section is C-shaped, 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 bending sections by circumferential sections, respectively, so that the carcass as a whole is also circumferential C-shaped. Such a framework is suitable, for example, for sealing rings whose sealing bodies have a longer axial lip.

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

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 provided uniformly.

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

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

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

Advantageously, the skeleton is made of spring wire by winding and stamping, or by winding in one step. In the former, it is for example possible to wind a spring wire in a shape resembling a serpentine spring, then bend this serpentine spring round into a ring shape and connect the two free ends, finally press-bend into a C-ring or L-ring, for example. In the latter, the skeleton can be manufactured quickly in one process.

The sealing ring according to the utility model thus advantageously saves costs, saves installation space, improves sealing properties and even seals oil without additional springs.

Drawings

Preferred embodiments of the present utility model are schematically illustrated below with reference to the accompanying drawings. The attached drawings are as follows:

figure 1 is a half cross-sectional view of a seal ring according to a first preferred embodiment of the utility model,

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 utility model, an

Fig. 4 is a perspective view of a skeleton of a gasket according to a third preferred embodiment of the present utility model.

Detailed Description

Fig. 1 shows a half cross-section of a seal ring according to a first preferred embodiment of the utility model. The sealing ring is used for sealing the bearing. The sealing ring is entirely circumferential C-shaped and has an annular sealing body 3 and a skeleton 5 which is embedded in the sealing body 3 by a vulcanization process, wherein the sealing body is made of rubber and has a sealing lip 4. The sealing ring is fixed on the bearing outer ring 1 through a sealing body 3 thereof, and a sealing lip 4 of the sealing ring dynamically seals the outer peripheral surface 2 of the shaft matched with the bearing, namely a sealing surface.

Fig. 2 shows a perspective view of the skeleton of the sealing ring according to fig. 1. As shown, the skeleton 5 is entirely C-shaped around and made of 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 apart. 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 curved section is connected to the free end of the outer axial section of one adjacent curved section by an outer axial section 9, and the free end of the inner axial section 8 of the curved section is connected to the free end of the inner axial section of the other adjacent curved section by an inner circumferential section 10. The frame 5 can thus support the sealing body 3 and at the same time 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 utility model. 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 a circumferential C-shape overall, so that the framework 5' has a circumferential C-shape overall. However, in the present embodiment, the bobbin 5' is made of a spring wire having a square cross section. The frame 5' can likewise support the sealing body 3 and at the same time press the sealing lip 4 against the sealing surface 2.

Fig. 4 shows a perspective view of a skeleton of a seal ring according to a third preferred embodiment of the present utility model. As shown, the armature 5 "is generally L-shaped in surrounding fashion and is made of spring wire having a circular cross section. In further alternatives, other shapes of cross-sections are also possible. Such a skeleton 5 "can be used for a sealing ring with a sealing lip extending substantially radially. The carcass 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 apart. The curved section has an outer axial section 6″ and a radial section 7″ wherein the radial section 7″ is connected to the outer axial section 6″ at its radially outer end. 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 one adjacent curved section by an outer axial section 9", and the free end of the radial section 7 "of the curved section is connected to the free end of the radial section of another adjacent curved section by an inner circumferential section 10". The frame 5″ can thus support the sealing body and at the same time press the sealing lip against the sealing surface.

While possible embodiments are exemplarily described in the above description, it should be understood that there are numerous variations of the embodiments still through all known and furthermore easily conceivable combinations of technical features and embodiments by the skilled person. 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 utility model in any way. The technical teaching for converting at least one exemplary embodiment is provided more in the foregoing description to the skilled person, wherein various changes may be made without departing from the scope of the claims, in particular with regard to the function and structure of the components.

List of reference numerals

1. Bearing outer ring

2. Shaft

3. Sealing body

4. Sealing lip

5, a step of; 5'; 5' skeleton

6, preparing a base material; 6'; 6' outboard axial section

7, preparing a base material; 7'; 7' radial segment

8, 8;8' inboard axial section

9, a step of performing the process; 9'; 9' outer circumferential section

10;10';10 "inner circumferential section

Claims

1. A sealing ring, characterized in that the sealing ring has 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) which forms a dynamic seal with a sealing surface (2),

the skeleton (5; 5'; 5') extends along the shape of the sealing body (3), and the skeleton (5; 5 ') has structural elasticity by its own structure, so that the skeleton (5; 5') can support the sealing body (3) and at the same time can press the sealing lip (4) against the sealing surface (2);

the frame has a plurality of curved sections which are spaced apart from one another and which are adapted to the shape of the sealing body (3), said curved sections being distributed in the circumferential direction of the sealing body (3), wherein the curved sections have two free ends which are each connected to the free ends of different adjacent curved sections, forming a frame with structural elasticity.

2. A sealing ring according to claim 1, characterized in that the two free ends of the curved sections are each connected with the free ends of a different adjacent curved section by a circumferential section (9, 10;9',10';9", 10") extending in the circumferential direction of the sealing body (3).

3. A sealing ring according to claim 2, 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 with the free ends of the axial sections of different adjacent bending sections, respectively, by means of the circumferential sections (9, 10;9',10 '), such that the skeleton (5; 5') as a whole is also circumferential C-shaped.

4. A sealing ring according to claim 2, 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 of different adjacent bending sections, respectively, by means of the circumferential sections (9 ", 10"), such that the skeleton (5 ") as a whole is also circumferential L-shaped.

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

6. Sealing ring according to claim 1, characterized in that the skeleton (5; 5') is embedded in the sealing body (3) by means of a vulcanization process.

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

8. The seal ring of claim 7, wherein the spring wire is circular or square in cross-section.

9. A sealing ring according to claim 7, characterized in that the skeleton (5; 5';5 ") is made of spring wire by winding and stamping, or by winding in one step.