Bearing

A bearing is provided, which includes a non-rotary inner ring; a rotary outer ring; and a sealing structure, located in a radial clearance between the inner ring and the outer ring, and includes a static seal ring and a dynamic seal ring which are coaxial and have one encircling the other one; wherein the static seal ring is fixedly configured on an outer circumferential surface of the inner ring, and includes a contact ring; the dynamic seal ring includes a ring-shaped body section and an elastic seal element; the body section includes a resist ring and a connect ring connected with the resist ring and located on a radial inner side of the resist ring; the connect ring is located on an axial inner side of the contact ring; the resist ring, the connect ring and the contact ring form an inner chamber; the elastic seal element is fixedly configured on the connect ring and comprises a seal lip protruding into the inner chamber; when a rotation speed of the outer ring is smaller than a critical value, the seal lip of the elastic seal element is in contact with the contact ring and a radial clearance exists between the seal lip and the resist ring; and when the rotation speed of the outer ring is greater than or equal to the critical value, the seal lip departs from the contact ring and stands against the resist ring, so that the seal lip and the static seal ring form a non-contact seal. Accordingly, the problem of existing bearing seals which cannot achieve advantages of both the contact seal and the non-contact seal at the same time is solved.

The present application claims priority to Chinese patent application No. 201410258106.1, filed on Jun. 11, 2014, and entitled “BEARING”, the entire disclosure of which is incorporated herein by reference.

FIELD OF THE INVENTION

The present disclosure generally relates to a bearing.

BACKGROUND

Existing bearing seals are classified into two categories, contact seals and non-contact seals. A general standard to evaluate the performance of a bearing seal includes the seal's ability to prevent external contaminants from entering into the bearing and to prevent lubricating agent in the bearing from leaking out.

The contact seals have reliable sealing performance, but are not suitable for bearings in high-speed rotation. The reason lies in that: when a bearing rotates at high-speed, a large friction torque is produced between a sealing structure and other parts of the bearing, which not only generates large amount of heat to accelerate aging of the sealing structure, but also cause severe wear to the sealing structure. As a result, service life of the sealing structure is reduced.

The non-contact seals are suitable for providing sealing for bearings in high-speed rotation, but do not have satisfactory sealing performance.

Existing bearing seals can realize either a contact seal or a non-contact seal. However, advantages of both the contact seal and the non-contact seal can not be achieved at the same time, which is exactly contrary to expectations of some bearings applied in situations with high demanding for sealing (e.g., a motor driven hub bearing).

SUMMARY

Problems solved by the present disclosure include: existing bearing seals can not achieve advantages of both the contact seal and the non-contact seal at the same time.

In order to solve above described problem, according to one aspect of the present disclosure, a bearing is provided. The bearing includes: a non-rotary inner ring, a rotary outer ring, and a sealing structure located in a radial clearance between the inner ring and the outer ring, wherein the sealing structure seals the bearing at an axial end portion of the bearing; the sealing structure includes a static seal ring and a dynamic seal ring which are coaxial and have one encircling the other one; the static seal ring is fixedly configured on an outer circumferential surface of the inner ring, and includes a contact ring extending along a radial direction of the bearing; the dynamic seal ring includes a ring-shaped body section and an elastic seal element; the body section includes a resist ring extending along an axial direction of the bearing and fixedly configured on an inner circumferential surface of the inner ring, and a connect ring connected with the resist ring and located on a radial inner side of the resist ring; the connect ring is located on an axial inner side of the contact ring; the resist ring, the connect ring and the contact ring form an inner chamber; the elastic seal element is fixedly configured on the connect ring and includes a seal lip protruding into the inner chamber; when a rotation speed of the outer ring is smaller than a critical value, the seal lip of the elastic seal element is in contact with the contact ring and a radial clearance exists between the seal lip and the resist ring; and when the rotation speed of the outer ring is greater than or equal to the critical value, the seal lip departs from the contact ring and stands against the resist ring under a centrifugal force, so that the seal lip and the static seal ring form a first non-contact seal.

In some embodiments, the elastic seal element includes a root section fixedly configured on the connect ring, and a reduced thickness waist section connecting the root section and the seal lip; a thickness of the reduced thickness waist section is smaller than a thickness of the seal lip; and the seal lip is capable of rotating with respect to the reduced thickness waist section.

In some embodiments, the connect ring includes a first suspended ring extending along the axial direction of the bearing, and a transition ring extending along the radial direction of the bearing and connecting the resist ring and the first suspended ring; the first suspended ring and the resist ring are configured to be spaced from and opposite to each other along the radial direction of the bearing; and the root section is fixed on the first suspended ring.

In some embodiments, the static seal ring further includes a retention ring and a second suspended ring; where the retention ring extends from a radial inner periphery of the contact ring along the axial direction of the bearing and is fixedly configured on an outer circumferential surface of the inner ring; the second suspended ring extends from a radial outer periphery of the contact ring along the axial direction of the bearing; an extending direction of the second suspended ring and that of the retention ring are opposite; the first suspended ring and the retention ring are configured to be spaced from and opposite to each other along the radial direction of the bearing, and form a second non-contact seal; and the resist ring and the second suspended ring are configured to be spaced from and opposite to each other along the radial direction of the bearing, and form a third non-contact seal.

In some embodiments, the root section of the elastic seal element is configured with a first labyrinth seal ring, and the first labyrinth seal ring is located in a radial clearance between the first suspended ring and the retention ring; and the sealing structure is configured with a second labyrinth seal ring, the second labyrinth seal ring is located in a radial clearance between the resist ring and the second suspended ring, and the second labyrinth seal ring is fixed on the second suspended ring.

In some embodiments, an end of the resist ring close to the connect ring has a tapered hole, and a diameter of the tapered hole gradually increases along a direction from an axial inner end of the resist ring to an axial outer end of the resist ring.

According to another aspect of the present disclosure, a bearing is provided. The bearing includes: a rotary inner ring, a non-rotary outer ring, and a sealing structure located in a radial clearance between the inner ring and the outer ring, wherein the sealing structure seals the bearing at an axial end portion of the bearing; the sealing structure includes a static seal ring and a dynamic seal ring which are coaxial and have one encircling the other one; the static seal ring is fixedly configured on an inner circumferential surface of the outer ring, and includes a contact ring extending along a radial direction of the bearing; the dynamic seal ring includes a ring-shaped body section and an elastic seal element; the body section includes a connect ring and a resist ring, the connect ring is fixedly configured on an outer circumferential surface of the inner ring, and the resist ring is connected with the connect ring and is located on a radial outer side of the connect ring; the resist ring extends along an axial direction of the bearing and a radial clearance exists between the resist ring and the inner ring; the resist ring is located on an axial outer side of the contact ring; the connect ring, the resist ring and the contact ring form an inner chamber; the elastic seal element is fixedly configured on the connect ring and includes a seal lip protruding into the inner chamber; when a rotation speed of the outer ring is smaller than a critical value, the seal lip of the elastic seal element is in contact with the contact ring and a radial clearance exists between the seal lip and the resist ring; and when the rotation speed of the outer ring is greater than or equal to the critical value, the seal lip departs from the contact ring and stands against the resist ring under a centrifugal force, so that the seal lip and the static seal ring form a first non-contact seal.

In some embodiments, the elastic seal element includes a root section fixedly configured on the connect ring, and a reduced thickness waist section connecting the root section and the seal lip; a thickness of the reduced thickness waist section is smaller than a thickness of the seal lip; and the seal lip is capable of rotating with respect to the reduced thickness waist section.

In some embodiments, the connect ring includes a first retention ring extending along the axial direction of the bearing and fixedly configured on an outer circumferential surface of the inner ring, and a transition ring connecting the first retention ring and the resist ring; the first retention ring and the resist ring are configured to be opposite to each other along the radial direction of the bearing; and the root section of the elastic seal element is fixedly configured on the first retention ring.

In some embodiments, the static seal ring further includes a second retention ring and a suspended ring; the second retention ring extends from a radial outer periphery of the contact ring along the axial direction of the bearing and is fixedly configured on an inner circumferential surface of the outer ring; the suspended ring extends from a radial inner periphery of the contact ring along the axial direction of the bearing; an extending direction of the suspended ring and that of the second retention ring are opposite; the first retention ring and the suspended ring are configured to be spaced from and opposite to each other along the radial direction of the bearing, and form second non-contact seal; and the resist ring and the second retention ring are configured to be spaced from and opposite to each other along the radial direction of the bearing, and form a third non-contact seal.

In some embodiments, the sealing structure further includes: a first labyrinth seal ring, which is located in a radial clearance between the first retention ring and the suspended ring, and is fixed on the suspended ring; and a second labyrinth ring, which is located in a radial clearance between the resist ring and the second retention ring, and is fixed on the resist ring.

In some embodiments, the resist ring has a tapered hole, and a diameter of the tapered hole gradually reduces along a direction from an axial inner end of the resist ring to an axial outer end of the resist ring.

In comparison with existing technologies, technical solutions provided by the present disclosure possess following advantages.

When the bearing rotates at a low speed, that is, when a rotation speed of the outer ring or the inner ring is smaller than a critical value, the seal lip is in contact with the contact ring and a radial clearance exists between the seal lip and the resist ring, so that the elastic seal element and the static seal ring form a contact seal. Therefore, the resulted bearing has a reliable sealing performance without producing a large friction torque. When the bearing rotates at a high speed, that is, when the rotation speed of the outer ring or the inner ring is greater than or equal to the critical value, the seal lip departs from the contact ring and stands against the resist ring under a centrifugal force, so that the elastic seal element and the static seal ring form a non-contact seal which is suitable for providing sealing for a bearing in high rotation speed. Accordingly, the sealing structure in the present disclosure can achieve advantages of both the contact seal and the non-contact seal.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Interpretation of Technical Terms

An axial outer end and an axial inner end refer to: two ends of a ring-shaped component located on an axial end portion of a bearing along an axial direction of the bearing. The bearing includes an outer ring, an inner ring and rolling elements (not textually described in the following embodiments and not shown in the drawings) located between the inner ring and the outer ring. Wherein, the axial outer end refers to an end farther from the rolling elements along the axial direction of the bearing; and the axial inner end refers to an end nearer to the rolling elements along the axial direction of the bearing.

An axial outer side refers to a side farther from the rolling elements along the axial direction of the bearing; and an axial inner side refers to a side nearer to the rolling elements along the axial direction of the bearing.

In order to clarify the objects, characteristics and advantages of the present disclosure, embodiments of the present disclosure will be described in detail in conjunction with the accompanying drawings.

First Embodiment

Referring toFIG. 1, a bearing with a rotary outer ring according to one embodiment is illustrated. The bearing includes: a non-rotary inner ring1; a rotary outer ring2; and a sealing structure3located in a radial clearance (not labeled) defined between the inner ring1and the outer ring2, wherein the sealing structure3seals the bearing at an axial end portion of the bearing. The sealing structure3includes a static seal ring31and a dynamic seal ring32which are coaxial and with one encircling the other one.

The static seal ring31includes: a contact ring311extending along a radial direction of the bearing; a retention ring312extending from a radial inner periphery of the contact ring311along an axial direction of the bearing and fixedly configured on an outer circumferential surface of the inner ring1; and a second suspended ring313extending from a radial outer periphery of the contact ring311along the axial direction of the bearing, wherein an extending direction of the second suspended ring313is opposite to an extending direction of the retention ring312. In some embodiments, the contact ring311, the retention ring312and the second suspended ring313may be formed into one piece and be made of metal (e.g., stainless steel).

The dynamic seal ring32includes: a ring-shaped body section321and an elastic seal element322. In the present embodiment, the elastic seal element322is made of rubber. The body section321includes: a resist ring321aextending along the axial direction of the bearing and fixedly configured on an inner circumferential surface of the outer ring2; and a connect ring321bconnected with the resist ring321aand located on a radial inner side of the resist ring321a. The connect ring321bis located on an axial inner side of the contact ring311. The resist ring321a, the connect ring321band the contact ring311form an inner chamber G.

Wherein, the connect ring321bincludes a first suspended ring321b1and a transition ring321b2. The first suspended ring321b1extends along the axial direction of the bearing. The transition ring321b2connects the resist ring321aand the first suspended ring321b1, and extends along the radial direction of the bearing. The first suspended ring321b1and the resist ring321aare configured to be spaced from and opposite to each other along the radial direction of the bearing. The elastic seal element322is located in the inner chamber G, and a root section322bof the elastic seal element322is fixed on the first suspended ring321b1. The elastic seal element322and the resist ring321aare configured to be opposite to each other along the radial direction of the bearing. The elastic seal element322further includes a seal lip322aprotruding into the inner chamber G.

The first suspended ring321b1and the resist ring321aare configured to be spaced from and opposite to each other along the radial direction of the bearing refers to that: the first suspended ring321b1and the resist ring321aare arranged at intervals along the radial direction of the bearing, and have an area facing each other. In some embodiments, the resist ring321a, the first suspended ring321b1and the transition ring321b2are formed into one piece and are made of metal (e.g., stainless steel). The elastic seal element322and the resist ring321aare configured to be opposite to each other along the radial direction of the bearing refers to that: the elastic seal element322and the resist ring321ahave an area facing each other along the radial direction of the bearing.

When the outer ring2of the bearing rotates, the seal ring32is driven to rotate along with the outer ring2. When the bearing rotates at a low speed, that is, a rotation speed of the outer ring2is smaller than a critical value, the seal lip322aof the elastic seal element322is in contacts with the contact ring311and a radial clearance (not labeled) exists between the seal lip322aand the resist ring321a, so that the elastic seal element322and the static seal ring31form a contact seal that has a reliable sealing performance. In addition, as the elastic seal element322and the static seal ring31form the contact seal when the bearing rotates at the low speed, a large friction torque will not be produced.

When the bearing rotates at a high speed, that is, the rotation speed of the outer ring2is greater than or equal to the critical value, the seal lip322departs from the contact ring311and stands against the resist ring321aunder a centrifugal force, so that the seal lip322aand the static seal ring31form a non-contact seal. The non-contact seal will not generate any friction torque, and is suitable for providing sealing for the bearing that rotates at the high speed.

The critical value of the rotation speed of the outer ring2can be selected by comprehensively taking an application situation, and demands of the bearing to the sealing performance and to the service life of the sealing structure into consideration. And a structure of the elastic seal element322is designed accordingly.

In the present embodiment, the bearing is a motor-driven hub bearing. Even a rotation speed of the motor-driven hub bearing reaches up to 40 m/s, the sealing structure still has a reliable sealing performance.

In technical solutions of the present disclosure, lubricating agent applied by the bearing is lubricating grease.

The first suspended ring321b1and the retention ring312are configured to be spaced from and opposite to each other along the radial direction of the bearing. The root section322bof the elastic seal element322is configured with a first labyrinth seal ring33located in a radial clearance between the first suspended ring321b1and the retention ring312. Therefore, with configuration of the first labyrinth seal ring33, the first suspended ring321b1and the retention ring312form a labyrinth seal (one type of non-contact seal).

The resist ring321aand the second suspended ring313are configured to be spaced from and opposite to each other along the radial direction of the bearing. The second suspended ring313is fixedly configured with a second labyrinth seal ring34located in a radial clearance between the resist ring321aand the second suspended ring313. Therefore, with configuration of the second labyrinth seal ring34, the resist ring321aand the second suspended ring313form a labyrinth seal. The first labyrinth seal ring33and the second labyrinth seal ring34are made of rubber.

The first suspended ring321b1and the contact ring311are spaced from each other along the axial direction of the bearing, and form a non-contact seal.

The non-contact seal formed by the resist ring321aand the second suspended ring313, the contact seal ring formed by the seal lip322aand the static seal ring31when the bearing rotates at the low speed (or the non-contact seal ring formed when the bearing rotates at the high speed), the non-contact seal formed by the first suspended ring321b1and the contact ring311, and the non-contact seal formed by the first suspended ring321b1and the retention ring312can successively serve as a first, a second, a third and a fourth defensive line for preventing external contaminants from entering into the bearing. The non-contact seal formed by the first suspended ring321b1and the retention ring312, the non-contact seal formed by the first suspended ring321b1and the contact ring311, the contact seal ring formed by the seal lip322aand the static seal ring31when the bearing rotates at the low speed (or the non-contact seal ring formed when the bearing rotates at the high speed), and the non-contact seal formed by the resist ring321aand the second suspended ring313can successively serve as a first, a second, a third and a fourth defensive line for preventing lubricating agent in the bearing from leaking out.

From above, it can be seen that, through adding the non-contact seal formed by the resist ring321aand the second suspended ring313, the non-contact seal formed by the first suspended ring321b1and the contact ring311, and the non-contact seal formed by the first suspended ring321b1and the retention ring321into the sealing structure3, a sealing performance of the sealing structure3is improved.

In an alternative embodiment, along the axial direction of the bearing, a clearance may exist between the first suspended ring321b1and the contact ring311, but a non-contact seal is not formed. In this case, the sealing structure3is configured with three defensive lines for realizing sealing.

When the bearing rotates at the low speed, the elastic seal element322and the static seal ring31form a contact seal, and the inner chamber G is divided into two inner chamber units which do not communicate with each other, wherein the two inner chamber units are respectively a first inner chamber unit G1and a second inner chamber unit G2. The first inner chamber unit G1communicates with the radial clearance between the resist ring321aand the second suspended ring313, and the second inner chamber unit G2communicates with the radial clearance between the first suspended ring321baand the retention ring312. When the bearing rotates at the high speed, the second inner chamber unit G2communicates with the radial clearance between the resist ring321aand the second suspended ring313, thus even there are external contaminations entering into the radial clearance between the resist ring321aand the second suspended ring313, it is hard for the external contaminations entering into the inner chamber unit G2because of the centrifugal force, and it is harder for the external contaminations entering into the radial clearance between the first suspended ring321b1and the retention ring312. Therefore, the external contaminations can be prevented from entering into the bearing, and the sealing performance of the sealing structure3is further improved.

The first labyrinth seal ring33has four ring-shaped seal teeth330, and the second labyrinth seal ring34has three ring-shaped seal teeth340. It should be noted that, number of the ring-shaped seal teeth330in the first labyrinth seal ring33and number of the ring-shaped seal teeth340in the second labyrinth seal ring34are not limited to the present embodiment and can be adjusted according to sealing requirements. The more the number of the ring-shaped seal teeth330and the number of the ring-shaped seal teeth340, the better the sealing performance.

Both an axial cross-section of the ring-shaped seal teeth330and that of the ring-shaped seal teeth340are in a shape of semicircular cylinder. However, a shape of the ring-shaped seal teeth330and that of the ring-shaped seal teeth340are not limited to the present embodiment, and they may be configured into other shapes.

In an alternative embodiment, the first labyrinth seal ring33and the second labyrinth seal ring34may not be configured. In this case, through the radial clearance between the first suspended ring321b1and the retention ring312, and the radial clearance between the resist ring321aand the second suspended ring313, the non-contact seal formed by the first suspended ring321b1and the retention ring312, and the non-contact formed by the resist ring321aand the second suspended ring313also can be realized, respectively.

In an alternative embodiment, the first labyrinth seal ring33may not be configured on the root section322bof the elastic seal element322, but be fixedly configured on the retention ring312. The second labyrinth seal ring34may be fixedly configured on the resist ring321a.

The elastic seal element322further includes a reduced thickness waist section322cconnecting the root section322band the seal lip322a. The reduced thickness waist section322chas a thickness smaller than a thickness of the seal lip322a, so as to make a center of gravity of the elastic seal element322be located on the seal lip322a. Through configuring the reduced thickness waist section322cin the elastic seal element322, the seal lip322acan rotate with respect to the reduced thickness waist section322cwhen the bearing rotates at the high speed, so as to make it easy for the seal lip322adeparting from the static seal ring31. Further, when the bearing rotates at the high speed, the seal lip322aitself will not deform due to the rotation. Further, when the bearing switches from the high-speed rotation into the low-speed rotation, it is easier for the seal lip322a, which stands against the resist ring321, recovering to the state of being in contact with the contact ring311.

The reduced thickness waist section322chas a thickness smaller than a thickness of the seal lip322arefers to that: if sectioning the elastic seal element322using an axial surface, in a cross-section of the elastic seal element322obtained, a size of the reduced thickness waist section322calong the axial direction of the bearing is smaller than a size of the seal lip322aalong the axial direction of the bearing, and an axis of the bearing is located on the axial surface.

In the present embodiment, an end of the resist ring321aclose to the connect ring321bhas a tapered hole (not labeled) whose diameter gradually increases along a direction from an axial inner end of the resist ring321ato an axial outer end of the resist ring321a, so as to make the end of the resist ring321aclose to the connect ring321bhave a shape of slope. When the seal lip322adeparts from the static seal ring31, the slope is able to prevent the seal lip322afrom radially and inwardly bending. Therefore, the seal lip322ais able to be prevented from being unable to recovering to the state of being in contact with the contact ring311, when the bearing switches from the high-speed rotation to the low-speed rotation. In addition, even there are external contaminations (e.g., waste water) entering into the inner chamber G, the external contaminations will slide along the slope in effect of gravity itself, thus the external contaminations can easily leak out from the inner chamber G.

When the rotation speed of the outer ring2is smaller than the critical value, part of the elastic seal element322and part of the contact ring311, which are located on a radial inner side of a contact position of the elastic seal element322and the contact ring311, form an axial clearance S. In the present embodiment, a dimension of the axial clearance S between the elastic seal element322and the contact ring311gradually reduces along an outward radial direction B of the bearing. When the seal lip322adeparts from the static seal ring31under the centrifugal force, even there are external contaminations entering into the second inner chamber unit G2, the external contaminations in the second inner chamber unit G2is prone to be thrown out from the axial clearance S in effect of the centrifugal force.

In the present embodiment, a seal ring O is configured between part of the resist ring321afacing the resist ring321aand the outer ring2, so as to prevent lubricating agent in the bearing from leaking out between the resist ring321and the outer ring2. In the present embodiment, the seal ring O is made of rubber.

Second Embodiment

As shown inFIG. 2, a bearing with a rotary inner ring according to one embodiment is illustrated. The bearing includes: a rotary inner ring4; a non-rotary outer ring5; a sealing structure6located in a radial clearance between the inner ring4and the outer ring5, wherein the sealing structure6seals the bearing at an axial end portion of the bearing. The sealing structure6includes a static seal ring61and a dynamic seal ring62which are coaxial and with one encircling the other one.

The static seal ring61includes: a contact ring611extending along a radial direction of the bearing; a second retention ring612extending from a radial outer periphery of the contact ring611along an axial direction of the bearing and fixedly configured on an inner circumferential surface of the outer ring5; and a suspended ring613extending from a radial inner periphery of the contact ring611along the axial direction of the bearing, wherein an extending direction of the suspended ring613is opposite to an extending direction of the second retention ring612.

The dynamic seal ring62includes: a ring-shaped body section621and an elastic seal element622. The body section621includes: a connect ring621afixedly configured on an outer circumferential surface of the inner ring4, and a resist ring621bconnected with the connect ring621band located on a radial outer side of the connect ring621b. The resist ring621aextends along the axial direction of the bearing and a radial clearance exists between the resist ring621aand the inner ring4. The resist ring621ais located on an axial outer side of the contact ring611. The connect ring621b, the resist ring621aand the contact ring611form an inner chamber G.

Wherein, the connect ring621bincludes a first retention ring621b1and a transition ring621b2. The first retention ring621b1extends along the axial direction of the bearing and is fixedly configured on an outer circumferential of the inner ring4. The transition ring621b2connects the first retention ring621b1and the resist ring621a. The first retention ring621b1and the resist ring621aare configured to be opposite to each other along the radial direction of the bearing. The elastic seal element622is located in the inner chamber G, and a root section622bof the elastic seal element is fixedly configured on the first retention ring621b1. The elastic seal element622and the resist ring621aare configured to be opposite to each other along the radial direction of the bearing. The elastic seal element622includes a seal lip622aprotruding into the inner chamber G.

When the inner ring4of the bearing rotates, the seal ring62is driven to rotate along with the inner ring4. When the bearing rotates at a low speed, that is, a rotation speed of the inner ring4is smaller than a critical value, the seal lip622aof the elastic seal element622is in contact with the contact ring611and a radial clearance (not labeled) exists between the seal lip622aand the resist ring621a, so that the elastic seal element622and the static seal ring61form a contact seal which has a reliable sealing performance.

When the bearing rotates at a high speed, that is, the rotation speed of the inner ring4is greater than or equal to the critical value, the seal lip622departs from the contact ring611and stands against the resist ring621aunder a centrifugal force, so that the seal lip622aand the static seal ring61form a non-contact seal. The non-contact seal will not produce any friction torque, and is suitable for providing sealing for the bearing that rotates at the high speed.

The first retention ring621b1and the suspended ring613are configured to be spaced from and opposite to each other along the radial direction of the bearing. A first labyrinth seal ring63is fixedly configured on the suspended ring613, and the first labyrinth seal ring63is located in a radial clearance between the first retention ring621b1and the suspended ring613. The resist ring621aand the second retention ring612are configured to be spaced from and opposite to each other along the radial direction of the bearing. A second labyrinth seal ring64is fixedly configured on the resist ring621a, and the second labyrinth seal ring64is located in a radial clearance between the resist ring621aand the second retention ring612. The resist ring621aand the contact ring611are spaced from each other along the axial direction of the bearing, and form a non-contact seal.

Functions of non-contact seals formed by the first labyrinth seal ring63, the second labyrinth seal ring64and the resist ring621awith the contact ring611can refer to the first embodiment, which will not be described in detail.

Similar to the first embodiment, in an alternative embodiment of the second embodiment, the first labyrinth seal ring63and the second labyrinth seal ring64may not be configured, so that the first retention ring621b1and the suspended ring613directly form a non-contact seal, and the resist ring621aand the second retention ring612form a non-contact seal.

Similar to the first embodiment, in an alternative embodiment of the second embodiment, the resist ring621aand the contact ring611are spaced from each other along the axial direction of the bearing, but do not form a non-contact seal.

Structure of the elastic seal element622in the dynamic seal ring62can refer to the first embodiment, which will not be described in detail.

In the present embodiment, a dimension of the axial clearance S between the elastic seal element622and the contact ring611gradually reduces along an outward radial direction B of the bearing. Advantages brought by this configuration can refer to the first embodiment, which will not be described in detail.

In the present embodiment, the resist ring621ahas a tapered hole (not labeled) whose diameter gradually reduces along a direction from an axial inner end of the resist ring621ato an axial outer end of the resist ring621a, so as to make the resist ring621ahave a shape of slope. In the present embodiment, advantages of the shape of the resist ring621acan refer to the first embodiment, which will not be described in detail.

It should be noted that, in the technical solutions of the present disclosure, a shape of the dynamic seal ring, a shape of the connect ring in the ring-shaped body section, a shape of the elastic seal element, and a position on the connect ring for fixedly configuring the elastic seal element thereon are not limited to the above recited embodiments.

In the present disclosure, each embodiment is described by a progressive way, and differences from previous embodiments are the emphasis. Identical portions of different embodiments can refer to each other.

Although the present disclosure has been disclosed above with reference to preferred embodiments thereof, it should be understood by those skilled in the art that various changes may be made without departing from the spirit or scope of the disclosure. Accordingly, the present disclosure is not limited to the embodiments disclosed.