A sealing structure for bearing lubrication

Abstract

The present invention discloses a sealing structure for bearing lubrication, which includes a bearing housing for installing a bearing and an outer retaining ring for preventing grease from splashing outwards. The bearing housing is provided with at least two inner grease storage chambers distributed circumferentially, and the outer retaining ring is provided with at least two outer grease storage chambers distributed circumferentially. Rib plates are provided between any two adjacent inner grease storage chambers and any two adjacent outer grease storage chambers. The rib plates in the bearing housing are provided with first through grooves for allowing grease to enter the bearing. The bearing housing is further provided with a grease injection port and a first grease injection passage communicating with the grease injection port and the first through grooves. The above-mentioned sealing structure for bearing lubrication can continuously supply base oil to the rolling bearing, thus effectively solving the problem of poor lubrication of large bearings in high-speed motors, being beneficial to extending the service life of the bearings, and realizing less maintenance or even maintenance-free of the bearings.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing lubrication, and particularly relates to a sealing structure for bearing lubrication. Background Art

[0002] A bearing is an important component of an electric motor, mainly used to support the motor rotor to ensure its normal and stable high-speed rotation. The operating state of the bearing directly affects the normal operation of the motor. Good lubrication of the bearing requires a suitable lubrication and sealing configuration to be ensured, especially for the grease-lubricated cylindrical roller bearings of high-speed motors.

[0003] In the prior art, inner and outer annular grease storage chambers are respectively provided on the inner and outer bearing covers of the bearing. However, the grease in the annular grease storage chamber is unstable due to the shearing drag effect of the bearing operation, and the grease in the upper part of the annular grease storage chamber is prone to collapse under high temperature, and a stable grease storage wall cannot be established, so that the grease in the storage chamber cannot be effectively attached and conducted to the side of the bearing, which will cause the base oil to not be continuously supplied to the bearing, thus unable to ensure good lubrication of the bearing.

[0004] Therefore, how to avoid the situation that good lubrication of the bearing cannot be ensured due to the inability to continuously supply the base oil to the bearing is a technical problem that needs to be solved by those skilled in the art at present. Summary of the Invention

[0005] The purpose of the present invention is to provide a sealing structure for bearing lubrication, which can realize continuous supply of base oil to the rolling bearing, thus effectively solving the problem of poor lubrication of large bearings in high-speed motors and being beneficial to extending the service life of the bearing.

[0006] To achieve the above purpose, the present invention provides a sealing structure for bearing lubrication, including a bearing seat for installing the bearing and an outer retaining ring for preventing the grease from splashing outwards. The bearing seat is provided with at least two inner grease storage chambers distributed circumferentially, the outer retaining ring is provided with at least two outer grease storage chambers distributed circumferentially, and there are rib plates between any two adjacent inner grease storage chambers and any two adjacent outer grease storage chambers. The rib plate in the bearing seat is provided with a first through groove for the grease to enter the bearing, and the bearing seat is also provided with a grease injection port and a first grease injection channel communicating with the grease injection port and the first through groove.

[0007] Optionally, it further includes a solid block arranged in the bearing seat and close to the top of the bearing seat.

[0008] Optionally, the solid block is provided with a second through groove for the grease to enter the bearing, and the bearing seat is also provided with a second grease injection channel communicating with the grease injection port and the second through groove.

[0009] Optionally, the first through groove and the second through groove are circumferentially spaced 180°.

[0010] Optionally, all the internal grease storage chambers, all the rib plates and the solid block in the bearing housing are integrally formed by a milling cutter.

[0011] Optionally, an arc-shaped grease discharge port is further included at the lower part of the inner retaining edge of the external grease storage chamber for discharging the grease in the bearing.

[0012] Optionally, the number of the arc-shaped grease discharge ports is two, and the two arc-shaped grease discharge ports are symmetrically distributed about the central axis of the cross-section of the outer retaining ring.

[0013] Optionally, all the external grease storage chambers, all the arc-shaped grease discharge ports and all the rib plates in the outer retaining ring are integrally formed by a milling cutter.

[0014] Optionally, an external oil seal for fixing to the outside of the bearing is further included, and the external oil seal and the outer retaining ring form a labyrinth grease discharge channel for discharging the excess grease.

[0015] Optionally, an external bearing cover fixedly connected to the bearing housing by bolts is further included, and a waste grease collection cavity communicating with the labyrinth grease discharge channel and used for collecting the waste grease discharged from the labyrinth grease discharge channel is arranged in the external bearing cover.

[0016] Compared with the above background art, the sealing structure for bearing lubrication provided by the embodiments of the present invention includes a bearing housing and an outer retaining ring. Among them, the bearing housing is used to mount the bearing, and the outer retaining ring is used to prevent the grease in the bearing from splashing outwards. The bearing housing is provided with at least two inner grease storage chambers distributed circumferentially, and the outer retaining ring is provided with at least two outer grease storage chambers distributed circumferentially. Moreover, there are rib plates between any two adjacent inner grease storage chambers, and there are also rib plates between any two adjacent outer grease storage chambers; further, the rib plate in the bearing housing is provided with a first through groove for the grease to enter the bearing, and the bearing housing is also provided with a grease injection port and a first grease injection channel, and the first grease injection channel is communicated with the grease injection port and the first through groove. The sealing structure for bearing lubrication provided by the embodiments of the present invention, on the one hand, by arranging rib plates between adjacent inner grease storage chambers and adjacent outer grease storage chambers, in this way, when the bearing rotates, the situation that the grease is unstable due to the circumferential dragging effect of the bearing can be reduced, ensuring the stable establishment of the lubricating walls in the inner and outer grease storage chambers on both sides of the bearing, so as to realize the close fitting and conduction between the grease and the side of the bearing, continuously supply base oil to the bearing, and further ensure good lubrication of the bearing; on the other hand, the new grease injected from the grease injection port of the bearing housing can directly enter the bearing through the first grease injection channel and the first through groove, so as to realize good lubrication of the bearing. The above setting method can realize continuous supply of base oil to the rolling bearing, thus effectively solving the problem of poor lubrication of large bearings in high-speed motors, being beneficial to extending the service life of the bearing, and realizing less maintenance or even maintenance-free of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0018] Figure 1 FIG. is an assembly structure schematic diagram of the sealing structure for bearing lubrication provided by the embodiments of the present invention;

[0019] Figure 2 is Figure 1 a schematic diagram of the internal structure of the bearing housing in FIG.;

[0020] Figure 3 is Figure 1 a schematic diagram of the internal structure of the outer retaining ring in FIG.

[0021] Wherein:

[0022] 1 - Rotating shaft, 2 - Outer oil seal, 3 - Outer bearing cover, 4 - Outer retaining ring, 41 - Outer grease storage chamber, 42 - Arc-shaped grease drain port, 5 - Bearing, 6 - Bearing housing, 61 - Inner grease storage chamber, 62 - Rib plate, 621 - First through groove, 63 - Solid block, 631 - Second through groove, 64 - Grease injection port, 65 - First grease injection channel, 66 - Second grease injection channel, 7 - Inner retaining ring, 8 - Labyrinth grease drain channel, 9 - Waste grease collection chamber. Detailed implementation manners

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] The core of the present invention is to provide a sealing structure for bearing lubrication, which can continuously supply base oil to the rolling bearing, thus effectively solving the problem of poor lubrication of large bearings in high-speed motors and being beneficial to extending the service life of the bearings.

[0025] In order to enable those skilled in the art of the present technology to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0026] It should be noted that the orientation terms such as "upper end, lower end, left side, right side" described below are defined based on the accompanying drawings of the specification.

[0027] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 which is the assembly structure schematic diagram of the sealing structure for bearing lubrication provided by the embodiment of the present invention; Figure 2 is Figure 1 the internal structure schematic diagram of the bearing housing in Figure 3 is Figure 1 the internal structure schematic diagram of the outer retaining ring in Figure 1 . The arrow direction in

[0028] is the flow direction of the grease. Figure 1As shown in the figure, the sealing structure for bearing lubrication provided by the embodiments of the present invention is mainly provided in a high-speed motor, and includes: a rotating shaft 1, an outer oil seal 2, an outer bearing cover 3, an outer retaining ring 4, a rolling bearing 5, a bearing housing 6, and an inner retaining ring 7. Among them, the inner ring of the rolling bearing 5 is fixed on the rotating shaft 1, and the two sides are axially positioned by the outer oil seal 2 and the inner retaining ring 7 respectively. The bearing housing 6 is used to install the bearing 5, the outer ring of the bearing 5 is installed in the bearing housing 6, and the outer bearing cover 3 is connected to the bearing housing 6 by bolts to compress the outer retaining ring 4 and axially install it on the bearing housing 6, so as to realize the axial positioning of the outer ring of the bearing 5. The outer retaining ring 4 is used to prevent the grease in the bearing 5 from splashing outwards.

[0029] Furthermore, the bearing housing 6 is provided with at least two inner grease storage chambers 61 distributed circumferentially, the outer retaining ring 4 is provided with at least two outer grease storage chambers 41 distributed circumferentially, and a rib plate 62 is provided between any two adjacent inner grease storage chambers 61, and a rib plate 62 is also provided between any two adjacent outer grease storage chambers 41. Compared with the prior art in which a circumferentially distributed annular grease storage chamber is provided, in the embodiments of the present invention, a plurality of inner grease storage chambers 61 and outer grease storage chambers 41 are both provided circumferentially, and by providing rib plates 62 between two adjacent inner grease storage chambers 61 and between two adjacent outer grease storage chambers 41, the circumferential dragging effect of the grease from the bearing 5 can be reduced to a certain extent, which is beneficial to the stable establishment of the lubricating walls of the two-side grease storage chambers, so as to be in close contact and conduction with the side of the bearing 5, continuously supply base oil to the bearing 5, and ensure good lubrication of the bearing 5.

[0030] In order to solve the problem of poor lubrication during the later online operation of the traditional bearing 5, that is, a grease injection channel is provided on the bearing housing, the grease injection channel is communicated with the inner grease storage chamber, and the newly added grease during later maintenance mainly enters the inner annular grease storage chamber through the single-point grease injection channel, and the old grease in the grease storage chamber is squeezed into the bearing to participate in lubrication, resulting in poor lubrication of the bearing 5. In the embodiments of the present invention, the rib plate 62 in the bearing housing 6 is provided with a first through groove 621 for allowing grease to enter the bearing 5. The bearing housing 6 is also provided with a grease injection port 64 and a first grease injection channel 65, and the first grease injection channel 65 is communicated with the grease injection port 64 and the first through groove 621. It can be seen that when adding new grease during later maintenance, the newly added grease injected from the grease injection port 64 of the bearing housing 6 can directly enter the bearing 5 through the first grease injection channel 65 and the first through groove 621, so as to realize good lubrication of the bearing 5.

[0031] In this way, for the sealing structure provided by the embodiments of the present invention for lubricating the bearing 5, on the one hand, by arranging a rib plate 62 between the adjacent inner grease storage chamber 61 and the adjacent outer grease storage chamber 41, when the bearing 5 operates, the grease can be prevented from being unstable due to the circumferential dragging effect of the bearing 5, ensuring the stable establishment of the lubricating walls in the inner and outer grease storage chambers on both sides of the bearing 5, so that the grease can be closely attached to and conduct with the side of the bearing 5, continuously supplying base oil to the bearing 5, and further ensuring good lubrication of the bearing 5; on the other hand, the new grease injected from the grease injection port 64 of the bearing housing 6 can enter the bearing 5 directly through the first grease injection channel 65 and the first through groove 621, thus achieving good lubrication of the bearing 5. The above setting method can continuously supply base oil to the rolling bearing 5, effectively solving the problem of poor lubrication of large bearings 5 in high-speed motors, being beneficial to extending the service life of the bearing 5, and realizing less maintenance or even maintenance-free of the bearing 5.

[0032] In addition, in order to prevent the grease in the upper part of the original annular grease storage chamber from being prone to collapse at high temperatures, a solid block 63 is further provided in the bearing housing 6. The solid block 63 is arranged at a position close to the top in the bearing housing 6, and the solid block 63 can be specifically set as an arc-shaped solid block 63. In the prior art, since the position of the solid block 63 is part of the grease storage chamber, the grease here is prone to collapse at high temperatures, so that a stable lubricating wall cannot be established in the grease storage chamber. In the embodiments of the present invention, the structure of the solid block 63 is used to fill the grease storage chamber at this place to avoid the high-temperature collapse and unloading of the grease in the upper part of the grease storage chamber, so that the collapsed and unloaded grease re-enters the bearing 5 and is stirred, resulting in abnormal temperature rise of the bearing 5.

[0033] As Figure 2 shown, in order to further ensure good lubrication of the bearing 5, a second through groove 631 is provided on one side of the solid block 63 close to the grease injection port 64. The second through groove 631 has the same function as the first through groove 621 and is used for allowing the grease to enter the bearing 5. Correspondingly, the bearing housing 6 is further provided with a second grease injection channel 66, and the second grease injection channel 66 is communicated with the grease injection port 64 and the second through groove 631.

[0034] In this way, when replenishing new grease during later maintenance, the new grease injected from the grease injection port 64 of the bearing housing 6 can also enter the bearing 5 directly through the second grease injection channel 66 and the second through groove 631, thus achieving good lubrication of the bearing 5.

[0035] Certainly, according to actual needs, the second through groove 631 and the first through groove 621 can be set to be 180° apart in the circumferential direction, and the first through groove 621 and the second through groove 631 include structures such as U-shaped and strip-shaped that are all beneficial for the grease to enter the bearing 5.

[0036] In this way, when replenishing new grease during later maintenance, the new grease injected through the grease injection port 64 of the bearing housing 6 can enter the bearing 5 directly through the first grease injection channel 65 and the second grease injection channel 66 and respectively through the first through groove 621 and the second through groove 631, thus realizing bidirectional grease replenishment, which is beneficial to the good lubrication of the bearing 5. Of course, according to actual lubrication needs, grease injection channels and corresponding through grooves can be additionally provided, and specific limitations are not made herein.

[0037] It should be noted that all the internal grease storage chambers 61, all the rib plates 62 and the solid blocks 63 provided in the bearing housing 6 can be integrally formed by a milling cutter, which is beneficial to batch production and thus improves production efficiency.

[0038] To optimize the above embodiment, an arc-shaped grease discharge port 42 is further included at the lower part of the inner edge of the outer grease storage chamber 41, and the arc-shaped grease discharge port 42 is used for discharging the grease in the bearing 5.

[0039] Specifically, since the grease in the bearing 5 will be discharged through the gap between the outer oil seal 2 and the outer retaining ring 4, if this gap is too large, excessive grease in the bearing 5 will be discharged, resulting in poor lubrication effect of the bearing 5; if this gap is too small, it is not conducive to the discharge of the grease in the bearing 5 and is likely to cause too high temperature inside the bearing 5. Therefore, by setting the arc-shaped grease discharge port 42, the gap between the outer oil seal 2 and the outer retaining ring 4 can be effectively optimized, so that the grease in the bearing 5 can be discharged from the bearing 5 on the premise of being more conducive to the lubrication of the bearing 5 and preventing the temperature inside the bearing 5 from being too high.

[0040] As Figure 3 shown, preferably, the number of the above arc-shaped grease discharge ports 42 is two, and the two arc-shaped grease discharge ports 42 are symmetrically distributed about the central axis of the cross-section of the outer retaining ring 4. The above setting method can enhance the discharge capacity of the grease in the bearing 5 to solve the problem of difficult grease discharge in the prior art, and at the same time can avoid excessive grease discharge like the centrifugal oil-slinging grease discharge structure, so as to ensure the effective matching and balance of the temperature rise and lubrication of the bearing 5.

[0041] It should be noted that the number of the arc-shaped grease discharge ports 42 can also be increased to more than two, and specific limitations are not made herein for the number and size of the arc-shaped grease discharge ports 42, provided that the configuration is based on the principle of achieving the optimal matching of temperature rise and lubrication.

[0042] That is to say, the above configuration can, on the basis of ensuring that the bearing 5 can be continuously supplied with grease to keep good lubrication, also timely discharge the excess grease in the bearing 5, so as to achieve a good balance between the lubrication and temperature rise of the high-speed motor bearing 5, thus greatly prolonging the service life of the bearing 5 and realizing less maintenance or even maintenance-free of the bearing 5.

[0043] On the above basis, an outer oil seal 2 fixed to the outside of the bearing 5 and an outer retaining ring 4 form a labyrinth grease drainage channel 8 for discharging excess grease. In addition, a waste grease collection cavity 9 is provided in the outer bearing cover 3, and the waste grease collection cavity 9 communicates with the labyrinth grease drainage channel 8 for collecting the waste grease discharged from the labyrinth grease drainage channel 8. The waste grease discharged through the labyrinth grease drainage channel 8 can be collected in the waste grease collection cavity 9, and when the waste grease collection cavity 9 is full, it can be discharged to the outside through the waste grease discharge port.

[0044] In summary, the direction of the oil path in the device is as Figure 1 shown by the arrows in. Specifically, when replenishing new grease during later maintenance, the new grease injected through the grease injection port 64 of the bearing housing 6 can enter the bearing 5 directly through the first grease injection channel 65 and the second grease injection channel 66 and respectively through the first through groove 621 and the second through groove 631. The lubricated grease can then enter the waste grease collection cavity 9 through the arc-shaped grease drainage port 42 and the labyrinth grease drainage channel 8, and then be discharged to the outside through the waste grease discharge port.

[0045] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0046] The above has introduced in detail the sealing structure for bearing lubrication provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the solution and core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A sealing structure for bearing lubrication, comprising a bearing housing (6) for mounting a bearing (5) and an outer retaining ring (4) for preventing grease from splashing outwards, characterized in that, The bearing seat (6) is provided with at least two inner grease storage chambers (61) distributed circumferentially, the outer retaining ring (4) is provided with at least two outer grease storage chambers (41) distributed circumferentially, and there are rib plates (62) between any two adjacent inner grease storage chambers (61) and any two adjacent outer grease storage chambers (41). The rib plate (62) in the bearing seat (6) is provided with a first through groove (621) for allowing grease to enter the bearing (5). The bearing seat (6) is further provided with a grease injection port (64) and a first grease injection channel (65) communicating with the grease injection port (64) and the first through groove (621); It further includes a solid block (63) arranged in the bearing seat (6) and close to the top of the bearing seat (6); The solid block (63) is provided with a second through groove (631) for allowing grease to enter the bearing (5). The bearing seat (6) is further provided with a second grease injection channel (66) communicating with the grease injection port (64) and the second through groove (631); It further includes an arc-shaped grease discharge port (42) arranged at the lower part of the inner retaining edge of the outer grease storage chamber (41) for discharging the grease in the bearing (5).

2. The sealing structure for bearing lubrication according to claim 1, characterized in that, The first through groove (621) and the second through groove (631) are 180° apart circumferentially.

3. The sealing structure for bearing lubrication according to claim 1, characterized in that, All the inner grease storage chambers (61), all the rib plates (62) and the solid block (63) in the bearing seat (6) are integrally formed by a milling cutter.

4. The sealing structure for bearing lubrication according to claim 1, characterized in that, The number of the arc-shaped grease discharge ports (42) is two, and the two arc-shaped grease discharge ports (42) are symmetrically distributed about the central axis of the cross-section of the outer retaining ring (4).

5. The sealing structure for bearing lubrication according to claim 4, wherein, All the outer grease storage chambers (41), all the arc-shaped grease discharge ports (42) and all the rib plates (62) in the outer retaining ring (4) are integrally formed by a milling cutter.

6. The sealing structure for bearing lubrication according to claim 1, characterized in that, It further includes an outer oil seal (2) fixed to the outside of the bearing (5), and the outer oil seal (2) and the outer retaining ring (4) form a labyrinth grease discharge channel (8) for discharging excess grease.

7. The sealing structure for bearing lubrication according to claim 6, characterized in that, It further includes an outer bearing cover (3) fixedly connected to the bearing seat (6) by bolts. A waste grease collection cavity (9) communicating with the labyrinth grease discharge channel (8) and used for collecting the waste grease discharged from the labyrinth grease discharge channel (8) is arranged in the outer bearing cover (3).

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