CN113357270B

CN113357270B - A bearing sealing ring and a sealing rotary system including the sealing ring

Info

Publication number: CN113357270B
Application number: CN202110510533.4A
Authority: CN
Inventors: 章呈杰; 陆利强; 杨锦章; 顾伟; 王飚; 王杰; 孙海平
Original assignee: Xingguang Agricultural Machine Co Ltd
Current assignee: Xingguang Agricultural Machine Co Ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2024-11-22
Anticipated expiration: 2041-05-11
Also published as: CN113357270A

Abstract

The invention aims to provide a bearing sealing ring which can play an effective sealing effect on a rotary bearing and simultaneously control the pressure of oil at the rotary bearing when the oil is replenished into a system, and a sealing rotary system comprising the bearing sealing ring, wherein the bearing sealing ring passes through an annular lip structure formed by the bearing sealing ring, when the internal oil pressure is overlarge, part of lubricating oil and dust and impurities accumulated at the clearance are discharged outwards, so that the viscosity of the oil is prevented from being increased when the oil pressure is overlarge, the resistance of a rotating part to be overcome in the moving process is increased, and the rotary bearing is ensured to operate stably and reliably under proper lubricating oil pressure all the time.

Description

Bearing sealing ring and sealing rotary system comprising same

Technical Field

The invention relates to the field of bearing sealing protection, in particular to a sealing ring and a sealing rotary system comprising the sealing ring.

Background

Bearings are "parts for assisting the rotation of objects" which are supported in the interior of a machine to constantly rotate, and machines using the bearings include automobiles, airplanes, generators, and even household appliances which are used every day, such as refrigerators, cleaners, air conditioners, and the like. Bearings support the rotating shafts of wheels, gears, turbines, rotors, etc. in these machines, ensuring a smoother rotation of the various parts. In the actual use process, the end face of the rotary bearing is generally provided with a sealing device with a dust cover and a sealing ring, so that dust and sealing are carried out, lubricating grease in the bearing can not outwards run off in use, the rotating part of the bearing is always in a stable lubrication state, and dust or harmful gas outside the bearing can not enter the bearing cavity to damage the bearing. As a most common bearing sealing mode, a bearing sealing ring is fixedly installed on the end face of a bearing and is widely applied to various mechanical equipment, and various different structures are formed by improving and evolving the bearing sealing ring according to different use environment conditions and use requirements so as to solve the problems in practical use.

The bearing sealing ring comprises a framework and a sealing ring body wrapped around the framework, wherein the sealing ring body comprises a body wrapped on the framework, an outer lip and an inner lip which are arranged at two ends of the body, an inclined plane facing to the outer ring of the bearing is arranged on one side edge of the outer lip, a contact lip which protrudes outwards obliquely and contacts with the inner ring of the bearing and a non-contact lip which does not contact with the inner ring of the bearing are arranged on the inner side edge of the outer lip in a downward extending mode, and a buffer groove is formed between the non-contact lip and the contact lip. The dustproof, waterproof and grease leakage preventing performances of the sealing ring are improved, the friction moment of the sealing ring is reduced, and the service life is prolonged; meanwhile, the structure of the sealing ring is simplified, the processing technology of the sealing ring is simpler, and the production cost is reduced.

The bearing sealing ring disclosed in the Chinese patent application document with the application number of CN201822214788.2 comprises a sealing ring body and a framework, wherein the framework is embedded in the sealing ring body; one side of the sealing ring body is provided with a sealing block, the other side of the sealing ring body is provided with a sealing lip, the sealing ring body comprises a first sealing lip, a second sealing lip and a third sealing lip, the first sealing lip protrudes towards the bearing direction, and the second sealing lip and the third sealing lip are located below the first sealing lip and are connected with the first sealing lip through a waist. According to the bearing sealing ring, 3 sealing lips are adopted for sealing, wherein the first sealing lip has an auxiliary sealing effect, the second sealing lip and the third sealing lip form interference fit with the inner ring, and a main sealing effect is achieved; the design of the waist can adjust the starting moment of the bearing, reduce the friction moment and reduce the energy loss of the bearing; the end of the third sealing lip is enlarged to be thickened, so that the sealing effect can be enhanced, and the service life of the bearing can be prolonged.

For some bearing structures which are inconvenient to disassemble and replace parts, after a certain service time, the lubricating oil is volatilized and leaked, so that the internal oil at the bearing is reduced, the condition of poor lubricating effect can be caused at the moment, and the relative rotation between the inner ring and the outer ring of the bearing is influenced. The common slewing bearing guarantees through filling fluid to inside regularly that lubricating oil is full of inside, and at this in-process, if the too big condition of inside oil pressure appears, can lead to the viscosity grow of lubricating fluid, makes the part starting torque grow of installation bearing department, influences the normal work of slewing system and even leads to the condition emergence that bearing seal structure damaged. The bearing sealing ring and the corresponding sealing structure realize an effective sealing effect on the bearing, but can not realize the regulation and control effect on the oil in the bearing so as to control the pressure of the oil in the bearing in a certain proper range.

In view of the above, the present invention provides a bearing seal ring capable of preventing excessive internal lubricating oil pressure when lubricating oil is injected into a bearing seal structure, and a seal rotary system including the same.

Disclosure of Invention

The invention provides a bearing sealing ring capable of controlling lubricating oil pressure at a bearing while having an effective sealing effect on the bearing and a sealing rotary system comprising the sealing ring.

The technical aim of the invention is realized by the following technical scheme:

A bearing seal ring is made of rubber materials, and a main body of the bearing seal ring is circular ring-shaped and comprises a front end face far away from one side of a bearing and a rear end face close to one side of the bearing during installation, an inner bonding face contacted with an inner rotating member and an outer bonding face contacted with an outer rotating member, and is characterized in that: the bearing sealing ring is provided with an annular lip, the annular lip extends outwards from the outer end face of the sealing ring to be protruded, and an abutting part for abutting against the inner surface of a protective cover arranged on the front side of the bearing sealing ring is formed on the outer side of the annular lip.

Preferably, the inner side surface of the annular lip is a conical surface with the radial dimension gradually increasing from the joint of the annular lip and the sealing ring main body to the outer end of the annular lip.

The sealing rotary system comprises an inner rotary member, an outer rotary member, a rotary bearing arranged between the inner rotary member and the outer rotary member, a bearing sealing ring and a protective cover arranged at the front side of the bearing sealing ring, wherein the abutting end part of an annular lip on the bearing sealing ring abuts against the inner wall surface of the protective cover and generates radial outward-turning expansion deformation under the effect of abutting acting force, so that a space between the bearing sealing ring and the protective cover in the sealing rotary system is divided into an inner oil cavity communicated with the rotary bearing at one side of the inner rotary member and an outer oil cavity communicated with the outside at one side of the outer rotary member; when the acting force of the oil in the inner oil cavity on the annular lip is enough to overcome the elastic resistance generated by deformation of the annular lip, the abutting part of the annular lip is separated from the inner surface of the protective cover, at the moment, the inner oil cavity is communicated with the outer oil cavity, the oil flows out from inside to outside, the oil pressure in the inner oil cavity falls back, and at the moment, the abutting part of the annular lip is in abutting contact with the protective cover again and separates the inner oil cavity and the outer oil cavity again.

Preferably, the inner rotating member is provided with an oil injection groove for injecting lubricating oil into the rotating bearing.

In a preferred aspect of the present invention, the oil-filling groove penetrates from the end of the inner rotary member inward to the rotary bearing, and a ball plunger is provided at the end of the oil-filling groove outside.

As the preference of the ball plunger, a protective sleeve for covering and protecting the ball plunger is fixedly sleeved on the outer side of the end part of the inner rotary member.

As the preference for the invention, the outer joint surface of the bearing sealing ring is fixedly connected with the inner side surface of the outer rotary member so that the bearing sealing ring moves along with the outer rotary member, and the protective cover is fixedly arranged on the inner rotary member and moves along with the inner rotary member.

As a preferable mode of the invention, the outer edge of the protective cover is bent and extended to one side of the slewing bearing along the axial direction of the central axis of the slewing bearing to form an annular bulge, the outer surface of the outer slewing member is inwards recessed to form an annular groove for accommodating the annular bulge, and the annular bulge is embedded into the annular groove to form a labyrinth sealing structure.

In a preferred aspect of the present invention, a recessed guide groove is formed in the inner mating surface of the bearing seal ring, and a slope is formed on a side of a cross section of the guide groove closer to the slewing bearing.

Preferably, the bearing sealing rings are mounted at the front end and the rear end of the slewing bearing.

In summary, the invention can realize the following beneficial effects:

1. The bearing sealing ring and the sealed rotary system comprising the same can control the oil pressure in the system, avoid the condition that the viscosity of the lubricating oil is increased due to the fact that the sealing performance of the bearing is damaged due to the fact that the oil pressure in the bearing is too high when the oil is filled, and the starting torque required by the rotary system and the resistance in the rotating process are increased due to the fact that the oil pressure in the bearing is too high, and can control the pressure of the lubricating oil in the rotary system within a certain range.

2. According to the bearing sealing ring and the sealing rotary system comprising the same, the thickness, the shape or the material of the annular lip part on the sealing ring can be selected and adjusted in a targeted manner, so that the elastic deformation of the annular lip part is correspondingly controlled, and the pressure required by switching between an opening state and a closing state is correspondingly controlled, so that the pressure of oil in the system is controlled.

3. The bearing sealing ring and the sealing rotary system comprising the same can be used for filling lubricating oil into the system after a certain time, and simultaneously discharging fine debris impurities formed by part abrasion in the use process or a small amount of dust entering from outside to inside, so that the sealing rotary system is effectively cleaned, and the working stability of the rotary system is ensured.

4. According to the bearing sealing ring and the sealed rotary system comprising the same, the guide groove formed in the bearing sealing ring can reduce the resistance when oil moves from the rotary bearing to the oil cavity through the gap between the bearing sealing ring and the inner rotary member, meanwhile, the contact between the inner side of the bearing sealing ring and the inner rotary member is reduced, and the friction resistance of the rotary system during rotary operation is reduced.

5. The bearing sealing ring and the sealing rotary system comprising the same are simple in structure, convenient to install, capable of controlling the oil pressure in the bearing without high-cost precise complex parts, and convenient to maintain and replace.

Drawings

FIG. 1 is a schematic view of the bearing seal ring;

FIG. 2 is a schematic cross-sectional view of a bearing seal ring;

FIG. 3 is a cross section of a bearing seal ring a partial enlarged schematic view of the structure;

FIG. 4 is a schematic cross-sectional view of a seal swivel system;

FIG. 5 is an enlarged schematic view of a part of a cross-sectional structure of the seal rotary system;

FIG. 6 is an enlarged schematic view of the relationship between the bearing seal ring and other components.

In the figure:

1-bearing sealing ring, 1 a-front end face, 1 b-rear end face, 1 c-inner joint face, 1 d-outer joint face, 1 ca-guiding groove;

2-annular lip, 2 a-abutting joint part, 2 b-conical surface;

3-a slewing bearing;

4-inner rotating member, 4 a-oil injection groove;

5-an outer rotating member;

6-a protective cover;

7, an external oil cavity;

8-an inner oil cavity;

9-labyrinth seal structure, 9 a-annular groove, 9 b-annular protrusion;

10-ball plunger;

11-protective sleeve.

Detailed Description

The following specific examples are intended to be illustrative of the invention and are not intended to be limiting, as modifications of the invention will be apparent to those skilled in the art upon reading the specification without inventive contribution thereto, and are intended to be protected by the patent law within the scope of the appended claims.

The scheme is realized by the following technical means:

Example 1: the bearing sealing ring 1 made of rubber is integrally in a ring shape and is sleeved and mounted between the inner rotary member 4 and the outer rotary member 5 together with the rotary bearing 3. The bearing sealing ring 1 is arranged on one side of the rotary bearing 3, and an inner bonding surface 1c which is close to the inner side and is used for bonding with the inner rotary member 4 and an outer bonding surface 1d which is close to the outer side and is used for bonding with the outer rotary member 5 are formed along the radial direction of the bearing sealing ring; along the axial direction of the rotation center axis of the rotating member, the bearing seal ring 1 is formed with a front end surface 1a on the side far from the rotating bearing 3 and a rear end surface 1b on the side near the rotating bearing 3. An annular lip 2 is formed in a ring shape by extending and protruding forward from the front end surface 1a of the bearing seal ring 1. One end of the annular lip 2 is connected with the main body of the bearing seal ring 1, and the other end extends to the front end to form an abutting part 2a for abutting with a protective cover 6 arranged on the outer side of the bearing seal ring 1. The inner side surface of the annular lip 2 presents a conical surface 2b, and the radial dimension of the annular lip 2 gradually increases while extending from the joint of the annular lip 2 and the main body of the bearing seal ring 1 to the front end. When the annular lip 2 is subjected to inward extrusion force along the central axis when the outer protective cover 6 is installed, the bearing sealing ring 1 is made of rubber material and has good elastic deformation capability, so that the abutting joint part 2a at the front end of the annular lip 2 can generate eversion and expansion deformation and be tightly jointed with the inner wall surface of the protective cover 6 to generate corresponding abutting force.

Example 2: the sealing rotary system comprises the bearing sealing ring 1 in the embodiment 1, wherein an inner rotary member 4 is a fixed central shaft, and an outer rotary member 5 is a rotary wheel which is sleeved on the central shaft to rotate. A rotary bearing 3 is fixedly arranged between the central shaft and the rotating wheel, the outer ring of the rotary bearing 3 is fixedly connected with the inner side surface of the rotating wheel and rotates along with the rotating wheel, and the inner ring of the rotary bearing 3 is tightly attached to the outer side surface of the central shaft and is fixedly connected into a whole. The bearing sealing rings 1 are arranged on the two side surfaces of the rotary bearing 3 along the axis direction on the central shaft, the protective cover 6 is arranged on the outer side of the bearing sealing rings 1, and the protective cover 6 is fixedly connected with the central shaft into a whole under the action of an outer pressing piece and does not move along the axial direction of the central shaft. The inner side of the protective cover 6, facing the annular lip 2 of the bearing seal ring 1, generates an axially inward pressing force while the protective cover 6 is mounted. Because the rear end face 1b of the bearing seal ring 1 is propped against and fixed with the rotary bearing 3 and does not move along the axial direction, the annular lip 2 generates outward expansion elastic deformation under the action of extrusion force, the propping and attaching part 2a at the front end of the annular lip is tightly attached to the inner side face of the protective cover 6, and meanwhile, the space between the bearing seal ring 1 and the protective cover 6 is divided into an inner oil cavity 8 and an outer oil cavity 7. An oil injection groove 4a for injecting lubricating oil into the bearing is formed in the central shaft, an opening of the oil injection groove 4a communicated with the outside is located at the end of the central shaft, and the oil injection groove 4a penetrates inwards to the bearing.

When the inside of the sealed rotary system is filled with the lubricating oil, the end part of the opening of the central shaft is filled with the lubricating oil inwards through the oil filling groove 4a, the lubricating oil flows to the inner oil cavity 8 after flowing through the rotary bearing 3, and at the moment, the lubricating oil does not continuously flow forwards and continuously accumulates at the inner oil cavity 8 due to the abutting and attaching part 2a of the annular lip 2 abuts against the protective cover 6. When the oil pressure in the inner oil cavity 8 rises to a certain extent, the acting force of the oil on the annular lip 2 is enough to overcome the elastic force of the annular lip 2, the annular lip 2 is opened at the moment, the lubricating oil flows and is discharged from the inner oil cavity 8 to the outer oil cavity 7, the lubricating oil in the inner oil cavity 8 and the rotary bearing 3 descends, and the annular lip 2 resets and is abutted against the inner side surface of the protective cover 6 again to separate the inner oil cavity 7 from the outer oil cavity 7.

In the process, the opening and closing of the sealing ring with the annular lip 2 effectively controls the pressure of the lubricating oil at the rotary bearing 3, and avoids the condition that the viscosity of the lubricating oil rises due to overlarge pressure when the lubricating oil is filled, and the starting torque which needs to be overcome when the inner rotary member and the outer rotary member 5 rotate to work rises. In the process, as a tiny gap channel is formed between the external oil cavity 7 and the outside, the oil discharged from the inside to the outside can simultaneously extrude and discharge dust impurities remained at the gap outwards, so that the impurities are prevented from further moving inwards to enter the bearing to affect the normal operation of the bearing, and meanwhile, an effective cleaning and protecting effect is achieved on the sealed rotary system.

The structure of the sealing rotary system is optimized, a ball plunger 10 structure is arranged at the end part, close to the outer side, of the central shaft serving as the inner rotary member 4, steel balls in the ball plunger 10 move inwards against the acting force of a spring under the action of external extrusion force, and the ball plunger 10 is opened to fill lubricating oil from outside to inside; when the external extrusion force is removed, the steel balls move outwards again under the action of the springs and are abutted against and attached to the inner wall of the opening end of the central shaft, so that the sealing effect on the internal lubricating oil liquid is achieved.

Further preferably, the protection sleeve 11 is fixedly arranged outside the end part of the central shaft of the ball plunger 10 through a threaded structure, the ball plunger 10 is covered and protected through the protection sleeve 11, and the situation that the external parts mistakenly touch or collide the end part of the ball plunger 10 to cause the plunger to open so that the internal lubricating oil leaks outwards to further cause the internal oil pressure value of the sealed rotary system to drop rapidly is effectively avoided, so that the working stability of the sealed rotary system is ensured.

It is further preferred that a labyrinth seal 9 is also provided between the protective cover 6 and the outer swivel member 5. Specifically, the outer edge of the inner side surface of the protective cover 6 is bent inwards to form an annular groove 9a, and the position of the outer rotary member 5 opposite to the protective cover 6 is recessed inwards to form an annular protrusion 9b for accommodating the annular groove 9 a. After the protective cover 6 is fixedly installed on the central shaft, the annular grooves 9a are embedded into the annular protrusions 9b and are staggered with each other to form a zigzag gap channel. The labyrinth seal structure 9 can effectively limit the internal oil and the external impurities in the clearance channel and separate the internal oil and the external impurities from each other, meanwhile, the oil is leaked outwards and the impurities move inwards to play a role in blocking, and the tightness and the durability of the sealing rotary system are further improved.

Further preferably, a guide groove 1ca recessed inward is formed in the inner contact surface 1c of the bearing seal ring 1, and the guide groove 1ca has a triangular cross-sectional shape and is inclined on the side of the slewing bearing 3. Under the effect of the guide groove 1ca of the structure, the lubricating oil in the sealed rotary structure conveniently flows from one side of the rotary bearing 3 to the inner oil cavity 8, and the reverse flow of the lubricating oil is blocked, so that a certain control lubricating oil unidirectional flow effect is achieved, and the sealing effect of preventing external impurities from entering the rotary bearing 3 is further improved.

While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. A sealed rotary system, comprising an inner rotary member (4), an outer rotary member (5), and a rotary bearing (3) mounted between the inner and outer rotary members, and further comprising a bearing seal ring (1) and a protective cover (6) mounted on the front side of the bearing seal ring (1), characterized in that:

The bearing seal ring (1) is made of rubber material, and its main body is in the shape of a ring, comprising a front end face (1a) away from the bearing side and a rear end face (1b) close to the bearing side during installation, as well as an inner fitting surface (1c) in contact with the inner rotating member (4) and an outer fitting surface (1d) in contact with the outer rotating member (5), characterized in that: an annular lip (2) is formed on the bearing seal ring (1), the annular lip (2) protrudes outwardly from the front end face (1a) on the seal ring, and a contact fitting portion (2a) is formed at the front end of the annular lip (2) for fitting with the inner surface of a protective cover (6) installed on the front side of the bearing seal ring (1);

The inner side surface of the annular lip (2) is a conical surface (2b) whose radial dimension gradually increases from the connection point with the sealing ring body to the outer end thereof;

The abutting and fitting portion (2a) of the annular lip (2) on the bearing seal ring (1) abuts against the inner wall surface of the protective cover (6), and under the effect of the abutting force, the annular lip (2) is deformed to expand outward along its own radial direction, and at the same time, the space between the bearing seal ring (1) and the protective cover (6) inside the sealed rotary system is divided into an inner oil chamber (8) connected to the rotary bearing (3) on the side of the inner rotary member (4) and an outer oil chamber (7) connected to the outside on the side of the outer rotary member (5); when the inner oil chamber (8) is closed, the inner oil chamber (8) is closed. When the force exerted by the oil in the cavity (8) on the annular lip (2) is sufficient to overcome the elastic resistance generated by the deformation of the annular lip (2), the abutting and fitting portion of the annular lip (2) is separated from the inner surface of the protective cover (6), and the inner oil cavity (8) is connected to the outer oil cavity (7), and the oil flows out from the inside to the outside. The oil pressure inside the inner oil cavity (8) drops, and the abutting and fitting portion (2a) of the annular lip (2) is again in contact with the protective cover (6) and the inner oil cavity (8) and the outer oil cavity (7) are separated again;

An oil filling groove (4a) for filling lubricating oil into the slewing bearing (3) is provided on the inner slewing member (4);

A recessed guide groove (1ca) is formed on the inner fitting surface (1c) of the bearing seal ring (1), and the cross section of the guide groove (1ca) is an inclined surface on the side close to the slewing bearing (3).

2. The sealed rotary system according to claim 1 is characterized in that: the oil filling groove (4a) penetrates inward from the end of the inner rotating part (4) to the rotary bearing (3), and a ball head plunger (10) is provided at the outer end of the oil filling groove (4a).

3. The sealed rotary system according to claim 2, characterized in that a protective sleeve (11) for covering and protecting the ball plunger (10) is also sleeved and fixedly installed on the outer side of the end of the inner rotary member (4).

4. The sealed rotary system according to claim 1 is characterized in that: the outer fitting surface (1d) of the bearing sealing ring (1) is fixedly connected to the inner side surface of the outer rotating part (5) so that the bearing sealing ring (1) moves with the outer rotating part (5), and the protective cover (6) is fixedly installed on the inner rotating part (4) and moves with the inner rotating part (4).

5. The sealed rotary system according to claim 1 is characterized in that: the outer edge of the protective cover (6) is bent and extended along the central axis of the rotary bearing (3) toward one side of the rotary bearing (3) to form an annular protrusion (9b), and the outer surface of the outer rotary member (5) is recessed inward to form an annular groove (9a) for accommodating the annular protrusion (9b), and the annular protrusion (9b) is embedded in the annular groove (9a) to form a labyrinth sealing structure (9).

6. The sealed rotary system according to claim 1, characterized in that the bearing sealing rings (1) are installed at both the front and rear ends of the rotary bearing (3).