CN112709760A - Bearing sealing structure and high-speed sealing bearing thereof - Google Patents

Abstract

The application relates to a bearing sealing structure and a high-speed sealing bearing thereof, wherein the bearing sealing structure comprises an inner ring, an outer ring and a sealing cover arranged between the inner ring and the outer ring, the inner ring, the outer ring and the sealing cover form a sealing cavity, the sealing cover comprises a fixing part, a connecting part and a lip part which are sequentially connected, a fixing groove for the fixing part to penetrate is arranged on the outer ring, the lip part is in sealing fit with the inner ring, a circumferential transition passage is formed between the fixing part and the outer ring, the fixing part is provided with an air inlet passage for communicating the transition passage and the sealing cavity along the radial direction of the sealing cover, and the fixing part is provided with an exhaust passage for; the air inlet channel, the transition channel and the exhaust channel are sequentially communicated to form a ventilation unit communicated with the sealed cavity and the outside. The sealing bearing has the advantages of having a good heat dissipation effect, effectively guaranteeing the highest rotating speed and the service life of the sealing bearing.

Description

Bearing sealing structure and high-speed sealing bearing thereof

Technical Field

The application relates to the field of sealing bearings, in particular to a bearing sealing structure and a high-speed sealing bearing thereof.

Background

The sealed bearing is a bearing with a sealed cover between an inner ring and an outer ring in the circumferential direction, and the sealed bearing is mainly used for reducing the entering of external dust into the bearing and reducing the leakage of lubricating grease in the bearing.

When the sealed bearing is applied to the occasion of high rotating speed, a large amount of hot gas can be generated in the process of high-speed rotation of the bearing, but due to the arrangement of the sealing cover, the hot gas cannot be effectively discharged from the cavity inside the bearing, and then the hot gas is accumulated inside the bearing, so that the whole bearing has higher temperature.

The phenomenon of heat accumulation is more prominent along with the increase of the rotating speed of the bearing, the temperature of the bearing under high-speed operation needs to be reduced in order to increase the upper limit of the rotating speed of the bearing, and the lubricating grease which is glued at normal temperature is partially vaporized along with the increase of the rotating speed of the bearing, so that the problem that how to reduce the leakage of the lubricating grease as far as possible under the condition of improving the heat dissipation effect of the sealed bearing is difficult to solve is solved.

Disclosure of Invention

In order to improve sealed bearing's radiating effect, this application provides a bearing seal structure and high-speed sealed bearing thereof.

In a first aspect, the bearing sealing structure provided by the application adopts the following technical scheme:

a bearing sealing structure comprises an inner ring, an outer ring and a sealing cover arranged between the inner ring and the outer ring, wherein a sealing cavity is formed by the inner ring, the outer ring and the sealing cover, the sealing cover comprises a fixing part, a connecting part and a lip part which are sequentially connected, a fixing groove for the fixing part to penetrate is formed in the outer ring, the lip part is in sealing fit with the inner ring, an annular transition channel is formed between the fixing part and the outer ring, an air inlet channel for communicating the transition channel with the sealing cavity is formed in the radial direction of the sealing cover by the fixing part, and an exhaust channel for communicating the transition channel with the outside is formed in the fixing;

the air inlet channel, the transition channel and the exhaust channel are sequentially communicated to form a ventilation unit communicated with the sealed cavity and the outside.

Through adopting above-mentioned technical scheme, at the high-speed pivoted in-process of bearing, because the inside of bearing produces a large amount of heats, lead to the gas temperature in the sealed cavity to rise, make it form a relative malleation for the outside environment of bearing, and the setting up of the unit of ventilating has linked together sealed cavity and external environment for the air can be because the existence of inside and outside pressure differential and arrange to the external world through the unit of ventilating, and take away partly heat, avoids the heat to pile up inside the bearing. The transition channel can increase the length of a path required by gas to travel to the outside of the bearing, and a structure similar to labyrinth seal is formed, so that the path required by the vaporized lubricating grease to flow to the outside is increased due to the arrangement of the transition channel, so that only little lubricating grease can be leaked along with the flow of the gas, and the leakage condition of the lubricating grease is reduced as much as possible on the premise of improving the heat dissipation performance of the bearing.

Preferably, the number of the air inlet channels is at least two in the circumferential direction of the sealing cover.

Through adopting above-mentioned technical scheme, the setting of two inlet channels can increase the gas volume that gaseous entering is to transition passageway, and then improves the radiating effect of bearing.

Preferably, the number of the exhaust passages is equal to that of the intake passages.

By adopting the technical scheme, the arrangement can increase the passage of gas discharged to the outside from the transition passage, the gas volume of hot gas discharged out of the bearing in unit time can be increased by the arrangement with the same number of the exhaust passages, the exhaust capacity of the bearing is improved, and the heat dissipation effect of the bearing is further improved.

Preferably, the air inlet channel and the air outlet channel are respectively distributed in a central symmetry manner in the circumferential direction of the sealing cover.

Preferably, the air inlet sealing cover further comprises partition blocks arranged on the fixing portion and used for partitioning the transition passage, the partition blocks are distributed in the circumferential direction of the sealing cover in a central symmetry mode, and the number of the partition blocks is the same as that of the air inlet passages.

Through adopting above-mentioned technical scheme, if do not set up the separation piece, the gas that gets into transition passageway through a plurality of inlet channels can produce at same exhaust passage department and converge and discharge from same exhaust passage again, and the crossing of two strands of air currents can improve the mobile hindrance degree of air current, influences the efficiency of gaseous exhaust bearing. And the setting of separating the piece makes the circumference of bearing form a plurality of mutually independent and the ventilation unit of mutually noninterference for gas can not intersect in the transition passageway at the in-process of bearing of discharging, improves the efficiency that gas discharged the bearing, thereby further improves the radiating effect of bearing.

Preferably, the air inlet channel, the exhaust channel and the partition block are all provided with two, and the two air inlet channels and the two exhaust channels are uniformly arranged at intervals in the circumferential direction of the sealing cover.

Preferably, the two partition blocks are positioned on a perpendicular bisector of a connecting line between any adjacent intake passage and exhaust passage.

Through adopting above-mentioned technical scheme, this kind of setting makes the mass distribution of sealed lid relatively more even, reduces the vibration that the bearing takes place at high-speed rotatory in-process.

Preferably, the periphery of the fixing portion is provided with an inclined surface for forming the transition channel on one side facing the sealed cavity, and the inclined surface and the two side groove walls of the fixing groove are matched with each other to form the transition channel.

Through adopting above-mentioned technical scheme, the shaping of convenient transition passageway on the one hand of this kind of mode of setting conveniently produces the manufacturing, and simultaneously, this kind of setting makes three side cell walls of transition passageway be the structure that the cross section is triangle-shaped each other, and stability preferred, intensity are higher. Because sealed lid can have the trend of outside expansion and improve the pressure to the outer lane at high-speed rotatory in-process, lead to the fixed part of sealed lid to be compressed and produce certain deformation, under this condition, the structure of the transition passageway of stability preferred can reduce the degree that deformation takes place, makes the air current still can the preferred circulate in the transition passageway to make and still can keep better radiating effect under the high rotational speed condition.

Preferably, exhaust passage sets up on the periphery wall of fixed part, exhaust passage's cross section is the semicircle, exhaust passage's axis direction is the same with the thickness direction of sealed lid, exhaust passage is close to the projection on the fixed slot one side cell wall of sealed cavity and falls into completely on transition channel's lateral wall.

In a second aspect, the present application provides a high-speed sealed bearing, which adopts the following technical scheme:

a high-speed sealed bearing adopts above-mentioned bearing seal structure.

In conclusion, the heat dissipation capacity of the high-speed sealed bearing can be effectively improved, meanwhile, the leakage rate of lubricating grease is low, and the bearing can be maintained at a high rotating speed.

Drawings

Fig. 1 is a cross-sectional view of a high-speed sealed bearing.

Fig. 2 is a sectional view of the high-speed seal bearing at the intake passage.

Fig. 3 is a cross-sectional view of the high-speed seal bearing at the exhaust passage.

FIG. 4 is a schematic view of a seal cap according to an embodiment.

Fig. 5 is a front view of the sealing cover in embodiment 1.

Fig. 6 is a front view of the sealing cover in embodiment 2.

Fig. 7 is a front view of the sealing cover in embodiment 3.

Fig. 8 is a front view of the sealing cover in embodiment 4.

Fig. 9 is a front view of the sealing cover in embodiment 5.

Description of reference numerals: 1. an outer ring; 2. an inner ring; 3. a sealing cover; 4. a rolling body; 5. a holder; 31. a rubber body; 32. reinforcing the framework; 33. a lip portion; 34. a connecting portion; 35. a fixed part; 11. fixing grooves; 6. a transition passage; 7. an air intake passage; 8. an exhaust passage; 36. an inclined surface; 9. and (5) separating the blocks.

Detailed Description

The present application is described in further detail below with reference to figures 1-9.

The embodiment of the application discloses a high-speed sealed bearing. Referring to fig. 1, the bearing comprises an outer ring 1, an inner ring 2 and a sealing cover 3 arranged between the outer ring 1 and the inner ring 2, wherein rolling bodies 4 and a retainer 5 for keeping a gap between adjacent rolling bodies 4 are arranged between the outer ring 1 and the inner ring 2, and a sealing cavity is formed between the outer ring 1, the inner ring 2 and the sealing cover 3. The sealing cover 3 comprises a rubber body 31 and a reinforcing framework 32 embedded in the rubber body 31, the sealing cover 3 is provided with a lip part 33, a connecting part 34 and a fixing part 35 which are sequentially connected from inside to outside in the radial direction, wherein the connecting part 34 protrudes to one side far away from the sealing cavity relative to the lip part 33 and the fixing part 35. The outer ring 1 is provided with a fixing groove 11 for interference installation of a fixing part 35, and the lip part 33 is in sealing fit with the inner ring 2. The fixing groove 11 is formed to enable the inner side wall of the bearing to form two areas with different inner diameters, wherein the inner diameter of one section in the sealing cavity is smaller, and the inner diameter of one section outside the sealing cover 3 is larger.

Referring to fig. 2 and 3, an annular transition channel 6 is formed between a portion of the fixing portion 35 penetrating through the fixing groove 11 and the outer ring 1, an air inlet channel 7 communicating the transition channel 6 with the sealing cavity is arranged on the fixing portion 35 along the radial direction of the sealing cover 3, and an air outlet channel 8 communicating the transition channel 6 with the outside is arranged on the fixing portion 35. The air inlet channel 7, the transition channel 6 and the air outlet channel 8 are communicated in sequence to form a ventilation unit for communicating the sealed cavity with the outside, and the ventilation unit forms a sealed channel similar to a labyrinth type. As the temperature in the sealed cavity increases, there is a tendency for the temperature in the sealed cavity to transition to a positive pressure, thereby forcing the heat flow in the sealed cavity to exit the bearing through the vent unit.

Referring to fig. 1 and 4, the outer circumference of the fixing portion 35 and the side facing the sealed cavity are provided with an inclined surface 36 for forming the transition passage 6, and the inclined surface 36 and the groove walls of the two sides of the fixing groove 11 are matched with each other to form the transition passage 6. Wherein, the cross section of transition passageway 6 is the triangle-shaped and arranges under the effect of inclined plane 36, and this kind of structural setting makes transition passageway 6 have stronger intensity.

Referring to fig. 2 and 4, one side of the air inlet passage 7 is opened to the inclined surface 36, and the other end is extended radially toward the axis of the sealing cover 3 and penetrates the inside of the fixing portion 35 to communicate with the sealing cavity. In this embodiment, the air inlet channel 7 further penetrates through a side wall of the fixing portion 35 facing the sealed cavity.

Referring to fig. 3 and 4, the exhaust passage 8 is provided on the outer peripheral wall of the fixing portion 35. The cross section of the exhaust passage 8 is arranged in a semicircular arc shape, and the axial direction of the exhaust passage is the same as the thickness direction of the sealing cover 3. In order to avoid the direct connection of the exhaust channel 8 to the sealed cavity, the projection of the exhaust channel 8 on the wall of the fixing groove 11 on the side close to the sealed cavity needs to completely fall on the side wall of the transition channel 6.

It should be noted that the air flow needs to pass through the intake passage 7, the transition passage 6 and the exhaust passage 8 in sequence to exit the bearing, and therefore the effective transition passage 6 needs to connect the adjacent intake passage 7 and exhaust passage 8. The number and distribution of the intake passages 7 and the exhaust passages 8 have a certain influence on the heat dissipation effect of the bearing, and thus, various embodiments are provided.

Referring to fig. 5, in embodiment 1, only one intake passage 7 and only one exhaust passage 8 are provided. At this time, two effective transition passages 6 between the intake passage 7 and the exhaust passage 8 are correspondingly formed, and the heat flow entering from the intake passage 7 can be exhausted from the same exhaust passage 8 through the transition passages 6 on both sides, that is, the two ventilation units share the same intake passage 7 and exhaust passage 8.

Referring to fig. 6, in embodiment 2, two intake passages 7 are provided, and one exhaust passage 8 is provided. In this case, the effective transition duct 6 is also correspondingly divided into two, and the heat flow enters the transition ducts 6 on both sides through the two inlet ducts 7 and is discharged through the same outlet duct 8, i.e. the two aeration units share the same outlet duct 8.

Referring to fig. 7, in embodiment 3, two intake passages 7 and two exhaust passages 8 are provided, wherein a perpendicular bisector of a line connecting the two intake passages 7 coincides with a perpendicular bisector of a line connecting the two exhaust passages 8. At this time, two effective transition passages 6 are provided, and two air inlet passages 7 and two air outlet passages 8 are respectively communicated with the corresponding transition passages 6, so that two ventilation units which are symmetrically arranged relative to the diameter of the sealing cover 3 are formed.

Referring to fig. 8, in embodiment 4, two intake passages 7 and two exhaust passages 8 are provided, wherein the intake passages 7 and the exhaust passages 8 are respectively arranged in the circumferential direction of the seal cover 3 in a centrosymmetric manner. The arrangement is such that the sealing cover 3 is divided in the circumferential direction to form four effective transition passages 6, the air flow entering any one air inlet passage 7 passes through the transition passages 6 on two adjacent sides and is discharged to the outside from two air outlet passages 8, and meanwhile, any one air outlet passage 8 also receives the air flow of the transition passages 6 on two adjacent sides.

However, in this embodiment, the airflow of the adjacent two transition passages 6 flows in opposite directions with any one of the exhaust passages 8 as a reference system, so that the airflow is converged at the exhaust passage 8 to be restricted with each other and cause certain interference, which affects the efficiency of the airflow discharging from the bearing.

Referring to fig. 4 and 9, therefore, in order to shield two of the transition passages 6, so that any one of the exhaust passages 8 can only receive the airflow flowing through the transition passage 6 on one side, a partition block 9 for partitioning the transition passage 6 is disposed on the sealing gasket and in the circumferential direction of the fixing portion 35, the partition block 9 is disposed on the inclined surface 36 and abuts against the other two groove walls of the transition passage 6 and fills the transition passage 6, and the two partition blocks 9 are distributed in central symmetry in the circumferential direction of the sealing cover 3. The arrangement of the partition block 9 enables two completely independent ventilation units which are arranged in a centrosymmetric manner to be formed in the circumferential direction of the sealing cover 3, and it can also be seen that two sides of any partition block 9 are two completely independent ventilation units.

Preferably, the two air inlet channels 7 and the two air outlet channels 8 are arranged at equal intervals in the circumferential direction of the seal cover 3, that is, if the air inlet channels 7 and the air outlet channels 8 are regarded as independent mass points, the connection lines of the four mass points and the circle centers thereof are in a state of being substantially perpendicular to each other. Meanwhile, the two partition blocks 9 are positioned on a perpendicular bisector of a connecting line of any adjacent intake passage 7 and exhaust passage 8.

Therefore, according to this embodiment, the number of the exhaust passages 8 and the intake passages 7 may be any natural number greater than two, but the number of the exhaust passages 8 and the number of the intake passages 7 need to be the same, and the number of the block pieces 9 also needs to be the same as the number of the exhaust passages 8. However, in spite of the arrangement of the exhaust passage 8 and the intake passage 7, the plurality of independent ventilation units formed by the partition block 9 are required to be approximately centrally symmetrically distributed in the circumferential direction of the seal cover 3.

It should be noted that the number of vent units is proportional to the heat dissipation effect, but the leakage effect of the grease is related to the length of the transition passage 6, and the longer the length of the transition passage 6, the less the grease is prone to leakage. Therefore, the number of the vent units is not too large, and more vent units will shorten the length of the transition passage 6 in each vent unit, resulting in excessive leakage of the grease. The specific number of the ventilation units needs to be configured according to the actual application environment, and in this embodiment, it is preferable that the number of the ventilation units is two and the ventilation units are distributed in central symmetry.

The implementation principle of the high-speed sealing bearing in the embodiment of the application is as follows:

when the bearing rotates at a high speed, a large amount of heat is generated inside the bearing, so that the sealed cavity has a tendency of converting to positive pressure, and heat flow is further discharged out of the bearing through the ventilation unit. At this time, the partially vaporized grease may enter the transition passage 6 through the vent passage 8, but since the length of the transition passage 6 is long, a structure similar to a labyrinth seal is formed, and the grease is less likely to leak out from the vent passage 8 more.

When the bearing is cooled, the inside of the sealing cavity has a tendency of negative pressure transformation, so that the airflow can reversely flow into the sealing cavity of the bearing. At this time, part of the grease in the transition passage 6 is cooled as the bearing is cooled, so that the liquefied grease is condensed into a solid state. And the backflow of the outside air can be blocked at the moment, and a large amount of outside air can not enter the sealed cavity.

It should be noted, however, that the drawings in this embodiment are only for convenience of description and the deep groove ball bearing is adopted. It can also be applied to any type of different sealed bearing, for example to a tapered roller bearing, without departing from the inventive concept of the present invention.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The utility model provides a bearing seal structure, includes inner circle (2), outer lane (1) and sets up sealed lid (3) between inner circle (2) and outer lane (1), inner circle (2), outer lane (1) and sealed lid (3) form sealed cavity, its characterized in that: the sealing cover (3) comprises a fixing part (35), a connecting part (34) and a lip part (33) which are sequentially connected, a fixing groove (11) for the fixing part (35) to penetrate through is formed in the outer ring (1), the lip part (33) is in sealing fit with the inner ring (2), a circumferential transition channel (6) is formed between the fixing part (35) and the outer ring (1), an air inlet channel (7) for communicating the transition channel (6) with a sealing cavity is formed in the radial direction of the sealing cover (3) of the fixing part (35), and an air exhaust channel (8) for communicating the transition channel (6) with the outside is formed in the fixing part (35);

the air inlet channel (7), the transition channel (6) and the exhaust channel (8) are sequentially communicated to form a ventilation unit for communicating the sealed cavity with the outside.

2. The bearing seal structure according to claim 1, wherein: the number of the air inlet channels (7) is at least two in the circumferential direction of the sealing cover (3).

3. The bearing seal structure according to claim 2, wherein: the number of the exhaust passages (8) is at least two in the circumferential direction of the sealing cover (3), and the number of the exhaust passages (8) is the same as that of the air inlet passages (7).

4. The bearing seal structure according to claim 3, wherein: the air inlet channel (7) and the air outlet channel (8) are respectively distributed in the circumferential direction of the sealing cover (3) in a central symmetry manner.

5. The bearing seal structure according to claim 4, wherein: the sealing structure is characterized by further comprising partition blocks (9) arranged on the fixing portion (35) and used for partitioning the transition passage (6), wherein the partition blocks (9) are distributed in a central symmetry mode in the circumferential direction of the sealing cover (3), and the number of the partition blocks (9) is the same as that of the air inlet passages (7).

6. The bearing seal structure according to claim 5, wherein: intake passage (7), exhaust passage (8) and separate break block (9) and all be provided with two intake passage (7) and two exhaust passage (8) are even interval in the circumference of sealed lid (3) and set up.

7. The bearing seal structure according to claim 6, wherein: the two partition blocks (9) are positioned on a perpendicular bisector of a connecting line of any adjacent air inlet channel (7) and exhaust channel (8).

8. The bearing seal structure according to any one of claims 1 to 7, wherein: the periphery of fixed part (35) just is located one side towards sealed cavity and is provided with inclined plane (36) that are used for shaping transition passageway (6), inclined plane (36) and the both sides cell wall of fixed slot (11) mutually support and form transition passageway (6).

9. The bearing seal structure according to claim 1, wherein: exhaust passage (8) set up on the periphery wall of fixed part (35), the transversal semicircle of personally submitting of exhaust passage (8), the axis direction of exhaust passage (8) is the same with the thickness direction of sealed lid (3), exhaust passage (8) fall into on the lateral wall of transition passageway (6) completely in fixed slot (11) near the projection on the one side cell wall of sealed cavity.

10. A high speed sealed bearing characterized by: a bearing seal structure according to any one of claims 1 to 9 is employed.

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