CN110529598B

CN110529598B - Sealing device

Info

Publication number: CN110529598B
Application number: CN201810517702.5A
Authority: CN
Inventors: 刘鑫; 李定
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2018-05-25
Filing date: 2018-05-25
Publication date: 2023-09-19
Anticipated expiration: 2038-05-25
Also published as: CN110529598A

Abstract

A sealing device is provided for mounting between a first member and a second member surrounding the first member to effect a seal, the sealing device comprising an elastic material having an inclined section extending obliquely relative to an axial direction of the sealing device, a free end of the inclined section forming a sealing lip. The elastic material is further formed with a grease replenishing chamber for accommodating grease, the grease replenishing chamber being located on an air side of the inclined section remote from the seal space, the seal being configured such that the grease can flow radially inward of the seal. The sealing device according to the invention improves the lubrication effect.

Description

Sealing device

Technical Field

The present invention relates to sealing of shafts and bearings, and more particularly to a sealing device for dynamic sealing between a shaft and a housing, or between an inner ring and an outer ring of a bearing.

Background

Sealing devices for shafts and bearings are known in the prior art for dynamic sealing between the shaft and the housing, or between the inner ring and the outer ring of the bearing. The seal is generally annular and includes a carcass and rubber bonded to the carcass. The backbone comprises an axially extending portion extending substantially along the axial direction of the sealing device and a radially extending portion extending substantially along the radial direction of the sealing device. The radially extending portion extends radially inward from an axial end of the axially extending portion. The rubber then follows the axially extending portion and the radially extending portion and forms a primary seal lip beyond the radially inner end of the radially extending portion.

In certain special industrial and automotive systems, the above-mentioned sealing devices are used in applications where space is limited and lubrication is a relatively high requirement. For example, since the main seal lip is generally extended obliquely as shown in fig. 1, grease located in the seal space (right side in the drawing, also referred to as grease side) hardly flows to the left side of the main seal lip, i.e., the air side of the seal device. After the shaft has been rotated, the main sealing lip lacks lubrication of the grease on the air side of the sealing device, since the pumping effect will cause a tendency for the air side to flow towards the grease side. In particular, when the shaft rotates at high speed, the air-side sealing lip may even be in the form of dry friction, which severely affects the service life and sealing effect of the sealing device.

Disclosure of Invention

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and a primary object of the present invention is to provide a sealing device which improves lubrication effects.

There is provided a sealing device for mounting between a first member and a second member surrounding the first member to effect a seal, the sealing device comprising an elastic material having an inclined section extending obliquely relative to an axial direction of the sealing device, a free end of the inclined section forming a sealing lip,

wherein, the liquid crystal display device comprises a liquid crystal display device,

the elastic material is further formed with a grease replenishing chamber for accommodating grease, the grease replenishing chamber being located on an air side of the inclined section remote from the seal space, the seal being configured such that the grease can flow radially inward of the seal.

In at least one embodiment, the first member is an inner ring of a shaft or bearing and the second member is an outer ring of a housing or bearing.

In at least one embodiment, the grease replenishment chamber is at least partially surrounded by a wall section protruding from the inclined section and the inclined section, the wall section having a through hole for grease to flow from the grease replenishment chamber to the radially inner side of the sealing device.

In at least one embodiment, the sealing lip is a primary sealing lip, and the wall section has a plurality of through holes arranged along a circumferential direction of the sealing device.

In at least one embodiment, the wall section is formed with an annular groove on a side of the wall section facing the grease replenishment chamber, and the through hole is provided at a portion of the wall section where the annular groove is formed.

In at least one embodiment, the through hole is a tapered hole, and the aperture of the tapered hole gradually decreases toward the first member.

In at least one embodiment, at least a portion of the wall section extends obliquely with respect to the axial direction.

In at least one embodiment, the through hole is disposed at a position distant from the free end of the wall section near the junction of the wall section and the inclined section.

In at least one embodiment, the oblique section has two subsections, the angle of inclination of which relative to the axial direction is different.

In at least one embodiment, the sealing device further comprises a skeleton to which the elastic material is attached, the skeleton being made of metal, the elastic material comprising rubber.

According to the sealing device provided by the invention, the lubricating grease supplementing cavity is arranged on the air side of the sealing lip, and lubricating grease in the lubricating grease supplementing cavity can flow to the contact area between the sealing lip and the first component in the process of high-speed rotation of the shaft, so that the lubricating effect is improved, dry friction is avoided, and the service life of the sealing device and the sealing effect are prolonged.

Drawings

Fig. 1 shows a partial axial cross-section of a typical sealing device of the prior art.

Fig. 2 shows a partial axial cross-section of a sealing device according to a first embodiment of the invention.

Fig. 3 shows a partial perspective view of a sealing device according to a first embodiment of the invention.

Fig. 4 shows a partial axial cross-section of a sealing device according to a second embodiment of the invention.

Fig. 5 shows a partial perspective view of a sealing device according to a second embodiment of the invention.

Description of the reference numerals

1. A sealing device;

10. a skeleton; 20. an elastic material;

11. an axially extending portion; 12. a radially extending portion;

21. a primary seal lip; 22. an inclined section; 23. a wall section; 24. a grease replenishment chamber; 25. radially inward subsections; 26. a radially outer subsection; 27. a portion proximate the free end; 28. a portion distal from the free end; 29. a through hole;

30. an annular groove;

20' an elastic material;

aaxial direction; r is radial.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific illustrations are for the purpose of illustrating how one skilled in the art may practice the invention, and are not intended to be exhaustive of all of the possible ways of practicing the invention, nor to limit the scope of the invention.

In the following detailed description, unless otherwise specified, the axial direction refers to the axial direction a of the sealing device of the present invention, which coincides with the axial direction of the member to be sealed by the sealing device of the present invention, and the radial direction refers to the radial direction R of the sealing device of the present invention, which coincides with the radial direction of the member to be sealed. The side of the sealing space (or sealing medium) sealed by the sealing device is referred to as grease side, and the opposite side of the sealing space (or sealing medium) in the axial direction is referred to as air side, for example, in fig. 1-5, the right side of the sealing device is grease side, and the left side of the sealing device is air side.

It should be noted that the first member according to the present invention may be an inner ring of a shaft or a bearing, and the second member may be an outer ring of a housing or a bearing, which is applicable to all of the following embodiments.

Fig. 1 shows a partial axial cross-section of a typical sealing device of the prior art. The sealing device 1 for dynamic sealing between a first component and a second component has a carcass 10 and an elastic material 20'. Wherein the elastic material 20' is, for example, rubber; the armature 10 may be made of metal, particularly steel. The carcass 10 has an axial extension 11 and a radial extension 12, the elastomeric material 20' extending inwardly from the radially inner side of the carcass 10 and having an inclined section 22, the free end of the inclined section 22 forming a primary sealing lip 21. The right side in the drawing is sealed with grease, and due to the inclination of the inclined section 22 and the sealing lip 21 as shown in the drawing, the grease on the right side hardly flows to the left side during operation, but on the contrary, there is a tendency to flow from the left side (air side) to the right side (grease side). The left side of such a seal is therefore usually subjected to dry friction, which makes the wear of the seal very large.

The following aspects of the invention improve upon such sealing devices.

First embodiment

Fig. 2 shows a partial axial sectional view of the sealing device according to the first embodiment of the invention, and the same structural features as in fig. 1 are not repeated, only for the improvement.

Unlike prior art sealing devices, the radially inner side of the inclined section 22 of the resilient material 20 also forms a wall section 23, the wall section 23 and the inclined section 22 enclosing a grease replenishment chamber 24 for replenishing grease. A through hole 29 is formed in the end of the wall section 23 remote from the free end for grease to flow from the grease replenishment chamber 24 to the radially inner side for lubricating the main seal lip 21 and the outer peripheral surface of the first member. It is preferable to provide a plurality of through holes 29 in the circumferential direction, and in particular, to uniformly provide a plurality of through holes 29. In order to facilitate the storage of grease in the grease replenishment chamber 24, the inclined section 22 is preferably provided as shown in the drawing with two subsections, wherein the radially inner subsection 25 has a greater slope with respect to the axial direction than the radially outer subsection 26.

Fig. 3 shows a partial perspective view of a sealing device according to a first embodiment of the invention. It can be seen in this figure that the wall section 23 preferably has two parts, a part 27 near the free end and a part 28 remote from the free end, which are also inclined at different angles with respect to the axial direction. The portion 27 near the free end has a greater slope than the portion 28 remote from the free end, the portion 28 remote from the free end being substantially parallel to the axial direction a, thereby facilitating the storage and flow of grease. The through hole 29 is provided in the portion 28 remote from the free end.

It should be understood that the grease replenishment chamber of the present embodiment may be provided to other sealing lips than the main sealing lip. The sealing device of the present embodiment may include two or more sealing lips, or two or more grease replenishment chambers.

By way of example and not limitation, grease may be added to the grease replenishment chamber prior to assembly of the seal of the present embodiment to the shaft and housing or to the bearing.

Second embodiment

Fig. 4 shows a partial axial cross-section of a sealing device according to a second embodiment of the invention. The same structural features as in fig. 2 of the present embodiment will not be repeated, and only the differences will be described.

Unlike the wall section 23 of the sealing device of the first embodiment, the radially outer side of the portion 28 remote from the free end has an annular groove 30, the annular groove 30 facilitating the flow of grease in the grease replenishment chamber to the through hole 29. The through-hole 29 is here arranged conically, whereby the grease outflow speed is slowed down, so that a longer grease replenishment is achieved.

Fig. 5 shows a partial perspective view of a sealing device according to a second embodiment of the invention. Wherein the wall section 23 is seen to have a plurality of through holes 29 distributed in the circumferential direction.

It should be understood that the second embodiment and the first embodiment may be appropriately combined. For example, the through-hole 29 in the first embodiment may also be a conical hole, or the wall section 23 of the first embodiment may also be provided with an annular groove 30.

The scope of the present invention is not limited to the specific examples described in the above-described specific embodiments, but falls within the scope of the present invention as long as the combination of technical features of the claims of the present invention is satisfied.

Claims

1. A sealing device for mounting between a first member and a second member surrounding the first member to effect a seal, the sealing device comprising an elastic material having an inclined section extending obliquely relative to an axial direction of the sealing device, a free end of the inclined section forming a sealing lip,

it is characterized in that the method comprises the steps of,

the elastic material is further formed with a grease replenishment chamber for accommodating grease, the grease replenishment chamber being located on an air side of the inclined section remote from the sealing space, the sealing device being configured such that the grease can flow radially inward of the sealing device, the grease replenishment chamber being at least partially surrounded by a wall section protruding from the inclined section and the inclined section, the wall section having a through hole for flowing grease from the grease replenishment chamber to the radially inward side of the sealing device.

2. The sealing device of claim 1, wherein the first member is an inner ring of a shaft or bearing and the second member is an outer ring of a housing or bearing.

3. The sealing device of claim 1, wherein the sealing lip is a primary sealing lip and the wall section has a plurality of through holes arranged along a circumferential direction of the sealing device.

4. The sealing device according to claim 1, characterized in that the wall section is formed with an annular groove, which is located on the side of the wall section facing the grease replenishment chamber, the through-hole being provided at the location of the wall section where the annular groove is formed.

5. The sealing device of claim 1, wherein the through hole is a tapered hole having a diameter that tapers in a direction toward the first member.

6. The sealing device of claim 1, wherein at least a portion of the wall section extends obliquely relative to the axial direction.

7. The sealing device of claim 1, wherein the through hole is disposed proximate to a junction of the wall section and the angled section and distal to a free end of the wall section.

8. A sealing device according to claim 1 or 2, wherein the inclined section has two subsections, the inclination angles of the two subsections with respect to the axial direction being different.

9. The sealing device of claim 1 or 2, further comprising a skeleton to which the resilient material is attached, the skeleton being made of metal, the resilient material comprising rubber.