Double-row cylindrical roller axle box bearing of power concentration motor train unit

Abstract

The utility model discloses a double-row cylindrical roller axle box bearing of a power concentration motor train unit, which comprises a first outer ring, a first retainer, a first inner ring, a plurality of first rollers, a second outer ring, a second retainer, a second inner ring and a plurality of second rollers, a second oil storage groove is formed in the end surface of the first retainer; the first inner ring is sleeved with the first retainer, and a fourth oil storage groove is formed in the peripheral surface of the first inner ring; the second retainer is sleeved with the second outer ring, a fifth oil storage groove is formed in the inner circumferential face of the second outer ring, and a sixth oil storage groove is formed in the end face of the second retainer; the second inner ring is sleeved with the second retainer, and an eighth oil storage groove is formed in the peripheral face of the second inner ring. According to the double-row cylindrical roller axle box bearing of the power concentration motor train unit, the storage capacity and the circulation channel of lubricating grease are increased, the utilization rate of the lubricating grease is increased, and the service life of the lubricating grease is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing design and manufacturing, and more specifically to a double-row cylindrical roller axle box bearing for a power-centralized EMU. Background Art

[0002] Double-row cylindrical roller bearings are one of the most widely used components in modern rails. They mainly rely on rolling contact between components to support rotation. They have the advantages of low friction resistance, low power consumption, and easy starting. Their performance plays a vital role in the effective operation and life of rail transit.

[0003] In the prior art, most double-row cylindrical roller bearings do not take into account the flow and replenishment of grease, and the storage capacity of the grease is small, the utilization rate of the grease is low, and the service life is short, which reduces its service life. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a double-row cylindrical roller axlebox bearing for a power concentrated EMU, so as to increase the storage capacity and circulation channel of the grease, and improve the utilization rate and service life of the grease.

[0005] Based on the above purpose, the utility model provides a double-row cylindrical roller axle box bearing for a power-concentrated EMU, comprising a first outer ring, a first retaining frame, a first inner ring, a plurality of first rollers, a second outer ring symmetrically arranged with the first outer ring, a second retaining frame symmetrically arranged with the first retaining frame, a second inner ring symmetrically arranged with the first inner ring, and a plurality of second rollers, wherein: the first outer ring is sleeved outside the first retaining frame, a plurality of first pockets are opened on the outer circumferential surface of the first retaining frame, a plurality of first rollers are installed in the first pockets in a one-to-one correspondence, a first oil storage groove is arranged on the inner circumferential surface of the first outer ring, a second oil storage groove is arranged on the end surface of the first retaining frame, and a third oil storage groove is arranged at the four corners of the first pocket; the first retaining frame is sleeved outside the first inner ring, and a fourth oil storage groove is arranged on the outer circumferential surface of the first inner ring Groove, the inner circumference of the first outer ring and the outer circumference of the first inner ring are both arranged in abutment with the circumferential surface of the first roller; the circumferential surface of the first roller is provided with a mesh oil storage groove; the second outer ring is sleeved outside the second retaining frame, and a plurality of second pockets are opened on the outer circumferential surface of the second retaining frame, and a plurality of second rollers are installed in the second pockets one by one, the inner circumference of the second outer ring is provided with a fifth oil storage groove, the end surface of the second retaining frame is provided with a sixth oil storage groove, and the four corners of the second pocket are provided with a seventh oil storage groove; the second retaining frame is sleeved outside the second inner ring, and the outer circumferential surface of the second inner ring is provided with an eighth oil storage groove, the inner circumferential surface of the second outer ring and the outer circumferential surface of the second inner ring are both arranged in abutment with the circumferential surface of the second roller; the circumferential surface of the second roller is provided with a mesh oil storage groove.

[0006] Optionally, it also includes a first sealing device and a second sealing device symmetrically arranged with respect to the first sealing device, wherein the first sealing device is fitted on the outer circumferential surface of the first outer ring and the end surface of the first inner ring, and the second sealing device is fitted on the outer circumferential surface of the second outer ring and the end surface of the second inner ring.

[0007] Optionally, it also includes a nylon connecting sleeve, one end of which is attached to the inner circumference of the first inner ring, and the other end of which is attached to the inner circumference of the second inner ring.

[0008] Optionally, an internal cavity is formed between the first inner ring and the second inner ring, and a vent is provided on the first outer ring, and the vent is communicated with the internal cavity.

[0009] Optionally, it also includes a rubber steel plate vulcanization sleeve, the inner end surface of the first outer ring is provided with a first slot, the inner end surface of the second outer ring is provided with a second slot, one end of the rubber steel plate vulcanization sleeve is snap-fitted and installed in the first slot, and the other end of the rubber steel plate vulcanization sleeve is snap-fitted and installed in the second slot.

[0010] Optionally, the inner circumferential surface of the first outer ring is provided with a first convex structure abutting against the outer circumferential surface of the first roller, and the outer circumferential surface of the first inner ring is provided with a second convex structure abutting against the outer circumferential surface of the first roller.

[0011] Optionally, the inner circumferential surface of the second outer ring is provided with a fourth convex structure abutting against the outer circumferential surface of the second roller, and the outer circumferential surface of the second inner ring is provided with a fifth convex structure abutting against the outer circumferential surface of the second roller.

[0012] Optionally, a first crossbeam is formed between every two adjacent first pockets, and a necking structure is formed between every two adjacent first crossbeams; a second crossbeam is formed between every two adjacent second pockets, and a necking structure is formed between every two adjacent second crossbeams.

[0013] Optionally, a first arc protrusion is provided on the outer side surface of the first cross beam, and a second arc protrusion is provided on the outer side surface of the second cross beam.

[0014] Optionally, the end surface of the first roller is a spherical end surface, and the end surface of the second roller is a spherical end surface.

[0015] Optionally, the end of the first sealing device is provided with a first slope inclined toward the center of the first outer ring, and the end of the second sealing device is provided with a second slope inclined toward the center of the second outer ring.

[0016] Optionally, a first observation window is provided on the first sealing device, and a second observation window is provided on the second sealing device.

[0017] The utility model provides a double-row cylindrical roller axle box bearing for a power concentrated EMU, comprising a first outer ring, a first retaining frame, a first inner ring, a plurality of first rollers, a second outer ring symmetrically arranged with the first outer ring, a second retaining frame symmetrically arranged with the first retaining frame, a second inner ring symmetrically arranged with the first inner ring, and a plurality of second rollers. Firstly, a first oil storage groove is arranged on the inner circumferential surface of the first outer ring, a second oil storage groove is arranged on the end surface of the first retaining frame, a third oil storage groove is arranged at the four corners of the first pocket hole, a fourth oil storage groove is arranged on the outer circumferential surface of the first inner ring, a mesh oil storage groove is arranged on the circumferential surface of the first roller, a fifth oil storage groove is arranged on the inner circumferential surface of the second outer ring, a sixth oil storage groove is arranged on the end surface of the second retaining frame The oil grooves are provided at the four corners of the second pocket hole with a seventh oil storage groove, the outer circumferential surface of the second inner ring is provided with an eighth oil storage groove, and the circumferential surface of the second roller is provided with a mesh oil storage groove; then, the first outer ring is sleeved outside the first retaining frame, the first retaining frame is sleeved outside the first inner ring, the second outer ring is sleeved outside the second retaining frame, and the second retaining frame is sleeved outside the second inner ring; finally, a plurality of first rollers are installed in the first pocket hole in a one-to-one correspondence, so that the inner circumferential surface of the first outer ring and the outer circumferential surface of the first inner ring are both in contact with the circumferential surface of the first roller, and a plurality of second rollers are installed in the second pocket hole in a one-to-one correspondence, so that the inner circumferential surface of the second outer ring and the outer circumferential surface of the second inner ring are both in contact with the circumferential surface of the second roller. The double-row cylindrical roller axle box bearing for a concentrated power train provided by the utility model increases the storage content and circulation channels of the grease by providing oil storage grooves on the first outer ring, the first retaining frame, the first inner ring, the first roller, the second outer ring, the second retaining frame, the second inner ring, and the second roller, so that the grease can circulate during the operation of the bearing, the utilization rate of the grease is improved, the loss of the grease content is reduced, and the service life of the grease is prolonged. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein:

[0019] Figure 1 It is a cross-sectional three-dimensional structural diagram of a double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to an embodiment of the utility model;

[0020] Figure 2 It is a front cross-sectional view of a double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to an embodiment of the utility model;

[0021] Figure 3 It is a schematic structural diagram of the first retainer in the double-row cylindrical roller axlebox bearing of a power-concentrated EMU according to an embodiment of the utility model;

[0022] Figure 4It is a schematic diagram of a partial three-dimensional structure of the outer ring of a double-row cylindrical roller axlebox bearing of a power-concentrated EMU according to an embodiment of the utility model;

[0023] Figure 5 It is a front view of the first outer ring of the double-row cylindrical roller axle box bearing of a power-concentrated EMU according to an embodiment of the utility model;

[0024] Figure 6 for Figure 5 Sectional view at AA;

[0025] Figure 7 for Figure 6 A local enlarged view at point B;

[0026] Figure 8 It is a side view of the first inner ring of the double-row cylindrical roller axle box bearing of a power-concentrated EMU according to an embodiment of the utility model;

[0027] Fig. 9 for Figure 8 Cross-sectional view at CC;

[0028] Fig.10 for Fig. 9 A local enlarged view at D;

[0029] Fig.11 The present invention is a schematic structural diagram of a first roller in a double-row cylindrical roller axlebox bearing of a power-concentrated EMU according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1: first outer ring; 2: first retaining frame; 3: first inner ring; 4: first roller; 5: second outer ring; 6: second retaining frame; 7: second inner ring; 8: second roller; 9: first pocket; 10: first oil storage groove; 11: second oil storage groove; 12: third oil storage groove; 13: fourth oil storage groove; 14: first sealing device; 15: second sealing device; 16: nylon connecting sleeve; 17: vent; 18: rubber steel plate vulcanization sleeve; 19: first convex structure; 20: second convex structure; 21: first crossbeam; 22: first circular arc protrusion; 23: first slope; 24: second slope; 25: first observation window; 26: second observation window. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the embodiments. The same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0033] like Figures 1 to 11 As shown, the double-row cylindrical roller axle box bearing for a power concentrated EMU provided by the utility model comprises a first outer ring 1, a first retaining frame 2, a first inner ring 3, a plurality of first rollers 4, a second outer ring 5 symmetrically arranged with the first outer ring 1, a second retaining frame 6 symmetrically arranged with the first retaining frame 2, a second inner ring 7 symmetrically arranged with the first inner ring 3, and a plurality of second rollers 8, wherein: the first outer ring 1 is sleeved outside the first retaining frame 2, a plurality of first pockets 9 are opened on the outer peripheral surface of the first retaining frame 2, a plurality of first rollers 4 are installed in the first pockets 9 in a one-to-one correspondence, a first oil storage groove 10 is arranged on the inner peripheral surface of the first outer ring 1, a second oil storage groove 11 is arranged on the end surface of the first retaining frame 2, and third oil storage grooves 12 are arranged at the four corners of the first pocket 9; the first retaining frame 2 is sleeved outside the first inner ring 3, and the outer peripheral surface of the first inner ring 3 is provided with a plurality of first pockets 9, and the plurality of first rollers 4 are installed in the first pockets 9 in a one-to-one correspondence. A fourth oil storage groove 13 is provided on the surface, the inner circumference of the first outer ring 1 and the outer circumference of the first inner ring 3 are both arranged in abutment with the circumferential surface of the first roller 4; a mesh oil storage groove is provided on the circumferential surface of the first roller 4; the second outer ring 5 is sleeved on the outside of the second retaining frame 6, and a plurality of second pockets are opened on the outer circumferential surface of the second retaining frame 6, and a plurality of second rollers 8 are installed in the second pockets in a one-to-one correspondence, the inner circumferential surface of the second outer ring 5 is provided with a fifth oil storage groove, the end face of the second retaining frame 6 is provided with a sixth oil storage groove, and the four corners of the second pockets are provided with a seventh oil storage groove; the second retaining frame 6 is sleeved on the outside of the second inner ring 7, and the outer circumferential surface of the second inner ring 7 is provided with an eighth oil storage groove, the inner circumferential surface of the second outer ring 5 and the outer circumferential surface of the second inner ring 7 are both arranged in abutment with the circumferential surface of the second roller 8; a mesh oil storage groove is provided on the circumferential surface of the second roller 8.

[0034] The utility model provides a double-row cylindrical roller axle box bearing for a power concentrated EMU, comprising a first outer ring 1, a first retaining frame 2, a first inner ring 3, a plurality of first rollers 4, a second outer ring 5 symmetrically arranged with the first outer ring 1, a second retaining frame 6 symmetrically arranged with the first retaining frame 2, a second inner ring 7 symmetrically arranged with the first inner ring 3, and a plurality of second rollers 8. Firstly, a first oil storage groove 10 is arranged on the inner circumferential surface of the first outer ring 1, a second oil storage groove 11 is arranged on the end surface of the first retaining frame 2, a third oil storage groove 12 is arranged at the four corners of the first pocket hole 9, a fourth oil storage groove 13 is arranged on the outer circumferential surface of the first inner ring 3, a mesh oil storage groove is arranged on the circumferential surface of the first roller 4, a fifth oil storage groove is arranged on the inner circumferential surface of the second outer ring 5, and a fifth oil storage groove is arranged on the end surface of the second retaining frame 6. There is a sixth oil storage groove, a seventh oil storage groove is arranged at the four corners of the second pocket hole, an eighth oil storage groove is arranged on the outer circumferential surface of the second inner ring 7, and a mesh oil storage groove is arranged on the circumferential surface of the second roller 8; then, the first outer ring 1 is sleeved on the outside of the first retaining frame 2, the first retaining frame 2 is sleeved on the outside of the first inner ring 3, the second outer ring 5 is sleeved on the outside of the second retaining frame 6, and the second retaining frame 6 is sleeved on the outside of the second inner ring 7; finally, multiple first rollers 4 are installed in the first pocket hole 9 in a one-to-one correspondence, so that the inner circumferential surface of the first outer ring 1 and the outer circumferential surface of the first inner ring 3 are both in contact with the circumferential surface of the first roller 4, and multiple second rollers 8 are installed in the second pocket hole in a one-to-one correspondence, so that the inner circumferential surface of the second outer ring 5 and the outer circumferential surface of the second inner ring 7 are both in contact with the circumferential surface of the second roller 8. The double-row cylindrical roller axle box bearing for a concentrated power train provided by the utility model increases the storage content and circulation channels of the grease by providing oil storage grooves on the first outer ring 1, the first retaining frame 2, the first inner ring 3, the first roller 4, the second outer ring 5, the second retaining frame 6, the second inner ring 7, and the second roller 8, so that the grease can be circulated during the operation of the bearing, the utilization rate of the grease is improved, the loss of the grease content is reduced, and the service life of the grease is prolonged.

[0035] like Figure 1 and Figure 2 As shown, the first sealing device 14 and the second sealing device 15 symmetrically arranged with the first sealing device 14 are also included. The first sealing device 14 is fitted on the outer circumference of the first outer ring 1 and the end face of the first inner ring 3, and the second sealing device 15 is fitted on the outer circumference of the second outer ring 5 and the end face of the second inner ring 7. In this embodiment, the first sealing device 14 and the second sealing device 15 can be iron sheets, so that the inside of the bearing is completely isolated from the external environment, effectively preventing dust, moisture and other impurities from entering the inside of the bearing, improving the service life and reliability of the bearing, reducing the frequency and cost of repairing and replacing the bearing, and increasing the reliability and availability of the EMU.

[0036] like Figure 1 and Figure 2As shown, it also includes a nylon connecting sleeve 16, one end of which is attached to the inner circumference of the first inner ring 3, and the other end of which is attached to the inner circumference of the second inner ring 7. In this embodiment, the nylon connecting sleeve 16 can support the first inner ring 3 and the second inner ring 7 to prevent the first inner ring 3 and the second inner ring 7 from falling apart during transportation, thereby improving the convenience of using the double-row cylindrical roller axlebox bearing of the power concentrated EMU.

[0037] like Figure 2 As shown, an internal cavity is formed between the first inner ring 3 and the second inner ring 7, and a vent 17 is provided on the first outer ring 1, and the vent 17 is connected to the internal cavity. In this embodiment, specifically, there can be multiple vents 17, and the vent 17 is connected to the internal cavity of the bearing, so that the atmosphere is connected to the internal cavity of the bearing. When the internal pressure of the bearing is too high, the gas can be discharged to the outside through the vent 17, or when the internal temperature of the bearing is too high, the hot gas can be discharged to the outside to dissipate the heat of the bearing, thereby improving the reliability of the double-row cylindrical roller axle box bearing of the power concentrated EMU.

[0038] like Figure 1 and Figure 2 As shown, it also includes a rubber steel plate vulcanized sleeve 18, a first slot is formed on the inner end surface of the first outer ring 1, a second slot is formed on the inner end surface of the second outer ring 5, one end of the rubber steel plate vulcanized sleeve 18 is snap-fitted into the first slot, and the other end of the rubber steel plate vulcanized sleeve 18 is snap-fitted into the second slot. In this embodiment, the rubber steel plate vulcanized sleeve 18 can stably connect the first outer ring 1 and the second outer ring 5 together, thereby improving the structural stability of the double-row cylindrical roller axle box bearing of the power-concentrated EMU.

[0039] like Figure 6 , Figure 7 , Fig. 9 and Fig.10 As shown, the inner circumference of the first outer ring 1 is provided with a first convex structure 19 that is arranged to abut against the outer circumference of the first roller 4, and the outer circumference of the first inner ring 3 is provided with a second convex structure 20 that is arranged to abut against the outer circumference of the first roller 4. In this embodiment, the first convex structure 19 is the same as the second convex structure 20, that is, the two ends are curved and the middle is a straight line, and the curve and the straight line transition smoothly. Compared with the traditional arc structure, this increases the fit between the first outer ring 1 and the first roller 4 and between the first inner ring 3 and the first roller 4, reduces stress distribution, avoids stress concentration, improves the bearing capacity of the bearing, and improves the structural stability of the double-row cylindrical roller axle box bearing of the power-concentrated EMU.

[0040] In one embodiment of the utility model, the inner circumference of the second outer ring 5 is provided with a fourth convex structure abutting against the outer circumference of the second roller 8, and the outer circumference of the second inner ring 7 is provided with a fifth convex structure abutting against the outer circumference of the second roller 8. The fourth convex structure is the same as the first convex structure 19, and the fifth convex structure is the same as the second convex structure 20, that is, the two ends are curved and the middle is a straight line, and the curve and the straight line transition smoothly. Compared with the traditional arc structure, this increases the fit between the second outer ring 5 and the second roller 8 and between the second ring and the second roller 8, reduces stress distribution, avoids stress concentration, and improves the bearing capacity of the bearing, thereby improving the structural stability of the double-row cylindrical roller axle box bearing of the power-concentrated EMU.

[0041] like Figure 3 As shown, a first crossbeam 21 is formed between each two adjacent first pockets 9, and a constriction structure is formed between each two adjacent first crossbeams 21. A second crossbeam is formed between each two adjacent second pockets, and a constriction structure is formed between each two adjacent second crossbeams. In this embodiment, the first retainer 2 and the second retainer 6 are both injection molded parts. The constriction structure between the two adjacent first crossbeams 21 can effectively prevent the first roller 4 from sliding out after being installed into the first pocket 9, and the constriction structure between the two adjacent second crossbeams can effectively prevent the second roller 8 from sliding out after being installed into the first pocket 9, thereby improving the structural stability of the double-row cylindrical roller axle box bearing of the power concentrated EMU.

[0042] like Figure 3 As shown, the outer side surface of the first cross beam 21 is provided with a first arc protrusion 22, and the outer side surface of the second cross beam is provided with a second arc protrusion. In this embodiment, the first arc protrusion 22 increases the structural strength of the first cross beam 21, and the second arc protrusion increases the structural strength of the second cross beam, thereby improving the structural strength of the first retainer 2 and the second retainer 6, and further improving the structural strength of the double-row cylindrical roller axle box bearing of the power concentrated EMU.

[0043] like Fig.11 As shown, the end face of the first roller 4 is a spherical end face, and the end face of the second roller 8 is a spherical end face. In this embodiment, the first roller 4 with a spherical end face can form a point contact with the first outer ring 1 and the first inner ring 3 to reduce the friction between them. Similarly, the second roller 8 with a spherical end face can form a point contact with the second outer ring 5 and the second inner ring 7 to reduce the friction between them, thereby improving the service life of the double-row cylindrical roller axle box bearing of the power concentrated EMU.

[0044] like Figure 2As shown, the end of the first sealing device 14 is provided with a first slope 23 inclined toward the center of the first outer ring 1, and the end of the second sealing device 15 is provided with a second slope 24 inclined toward the center of the second outer ring 5. In this embodiment, the first slope 23 structure helps the grease to flow back into the bearing, reducing the friction between the first roller 4 and the first outer ring 1 and the first inner ring 3, and the second slope 24 structure helps the grease to flow back into the bearing, reducing the friction between the second roller 8 and the second outer ring 5 and the second inner ring 7, thereby improving the motion performance of the double-row cylindrical roller axle box bearing of the power concentrated EMU.

[0045] like Figure 2 As shown, a first observation window 25 is provided on the first sealing device 14, and a second observation window 26 is provided on the second sealing device 15. In this embodiment, both the first observation window 25 and the second observation window 26 can be used to observe the distribution of the grease, and to sample and detect the performance status of the grease, thereby reducing the number of times the bearing is disassembled and increasing the service life of the double-row cylindrical roller axlebox bearing of the power concentrated EMU.

[0046] The utility model provides a double-row cylindrical roller axle box bearing for a power concentrated EMU, comprising a first outer ring 1, a first retaining frame 2, a first inner ring 3, a plurality of first rollers 4, a second outer ring 5 symmetrically arranged with the first outer ring 1, a second retaining frame 6 symmetrically arranged with the first retaining frame 2, a second inner ring 7 symmetrically arranged with the first inner ring 3, and a plurality of second rollers 8. Firstly, a first oil storage groove 10 is arranged on the inner circumferential surface of the first outer ring 1, a second oil storage groove 11 is arranged on the end surface of the first retaining frame 2, a third oil storage groove 12 is arranged at the four corners of the first pocket hole 9, a fourth oil storage groove 13 is arranged on the outer circumferential surface of the first inner ring 3, a mesh oil storage groove is arranged on the circumferential surface of the first roller 4, a fifth oil storage groove is arranged on the inner circumferential surface of the second outer ring 5, and a fifth oil storage groove is arranged on the end surface of the second retaining frame 6. There is a sixth oil storage groove, a seventh oil storage groove is arranged at the four corners of the second pocket hole, an eighth oil storage groove is arranged on the outer circumferential surface of the second inner ring 7, and a mesh oil storage groove is arranged on the circumferential surface of the second roller 8; then, the first outer ring 1 is sleeved on the outside of the first retaining frame 2, the first retaining frame 2 is sleeved on the outside of the first inner ring 3, the second outer ring 5 is sleeved on the outside of the second retaining frame 6, and the second retaining frame 6 is sleeved on the outside of the second inner ring 7; finally, multiple first rollers 4 are installed in the first pocket hole 9 in a one-to-one correspondence, so that the inner circumferential surface of the first outer ring 1 and the outer circumferential surface of the first inner ring 3 are both in contact with the circumferential surface of the first roller 4, and multiple second rollers 8 are installed in the second pocket hole in a one-to-one correspondence, so that the inner circumferential surface of the second outer ring 5 and the outer circumferential surface of the second inner ring 7 are both in contact with the circumferential surface of the second roller 8. The double-row cylindrical roller axle box bearing for a concentrated power train provided by the utility model increases the storage content and circulation channels of the grease by providing oil storage grooves on the first outer ring 1, the first retaining frame 2, the first inner ring 3, the first roller 4, the second outer ring 5, the second retaining frame 6, the second inner ring 7, and the second roller 8, so that the grease can be circulated during the operation of the bearing, the utilization rate of the grease is improved, the loss of the grease content is reduced, and the service life of the grease is prolonged.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A double-row cylindrical roller axlebox bearing for a power-concentrated EMU, characterized in that: The invention comprises a first outer ring, a first retaining frame, a first inner ring, a plurality of first rollers, a second outer ring symmetrically arranged with the first outer ring, a second retaining frame symmetrically arranged with the first retaining frame, a second inner ring symmetrically arranged with the first inner ring, and a plurality of second rollers, wherein: The first outer ring is sleeved on the outside of the first retaining frame, a plurality of first pockets are formed on the outer circumferential surface of the first retaining frame, a plurality of the first rollers are mounted in the first pockets in a one-to-one correspondence, a first oil storage groove is formed on the inner circumferential surface of the first outer ring, a second oil storage groove is formed on the end surface of the first retaining frame, and third oil storage grooves are formed at the four corners of the first pockets; The first retaining frame is sleeved outside the first inner ring, the outer circumferential surface of the first inner ring is provided with a fourth oil storage groove, and the inner circumferential surface of the first outer ring and the outer circumferential surface of the first inner ring are both arranged in contact with the circumferential surface of the first roller; The circumferential surface of the first roller is provided with a mesh oil storage groove; The second outer ring is sleeved on the outside of the second retainer, a plurality of second pockets are formed on the outer circumferential surface of the second retainer, a plurality of second rollers are mounted in the second pockets in a one-to-one correspondence, a fifth oil storage groove is formed on the inner circumferential surface of the second outer ring, a sixth oil storage groove is formed on the end surface of the second retainer, and seventh oil storage grooves are formed at the four corners of the second pockets; The second retainer is sleeved outside the second inner ring, an eighth oil storage groove is provided on the outer circumferential surface of the second inner ring, and the inner circumferential surface of the second outer ring and the outer circumferential surface of the second inner ring are both arranged in contact with the circumferential surface of the second roller; The circumferential surface of the second roller is provided with a mesh-shaped oil storage groove.

2. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 1, characterized in that: It also includes a first sealing device and a second sealing device symmetrically arranged with the first sealing device, wherein the first sealing device is fitted on the outer circumferential surface of the first outer ring and the end surface of the first inner ring, and the second sealing device is fitted on the outer circumferential surface of the second outer ring and the end surface of the second inner ring.

3. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 1, characterized in that: It also includes a nylon connecting sleeve, one end of which is attached to the inner circumference of the first inner ring, and the other end of which is attached to the inner circumference of the second inner ring.

4. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 1, characterized in that: An internal cavity is formed between the first inner ring and the second inner ring, and a vent is provided on the first outer ring, and the vent is communicated with the internal cavity.

5. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 1, characterized in that: It also includes a rubber steel plate vulcanization sleeve, the inner end surface of the first outer ring is provided with a first slot, the inner end surface of the second outer ring is provided with a second slot, one end of the rubber steel plate vulcanization sleeve is snap-fitted and installed in the first slot, and the other end of the rubber steel plate vulcanization sleeve is snap-fitted and installed in the second slot.

6. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 1, characterized in that: The inner circumferential surface of the first outer ring is provided with a first convex structure abutting against the outer circumferential surface of the first roller, and the outer circumferential surface of the first inner ring is provided with a second convex structure abutting against the outer circumferential surface of the first roller.

7. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 1, characterized in that: The inner circumferential surface of the second outer ring is provided with a fourth convex structure abutting against the outer circumferential surface of the second roller, and the outer circumferential surface of the second inner ring is provided with a fifth convex structure abutting against the outer circumferential surface of the second roller.

8. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 1, characterized in that: A first crossbeam is formed between every two adjacent first pockets, and a necking structure is formed between every two adjacent first crossbeams. A second crossbeam is formed between every two adjacent second pockets, and a necking structure is formed between every two adjacent second crossbeams.

9. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 8, characterized in that: The outer side surface of the first cross beam is provided with a first arc protrusion, and the outer side surface of the second cross beam is provided with a second arc protrusion.

10. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 8, characterized in that: The end surface of the first roller is a spherical end surface, and the end surface of the second roller is a spherical end surface.

11. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 2, characterized in that: The end of the first sealing device is provided with a first slope inclined toward the center of the first outer ring, and the end of the second sealing device is provided with a second slope inclined toward the center of the second outer ring.

12. The double-row cylindrical roller axlebox bearing for a power-concentrated EMU according to claim 2, characterized in that: The first sealing device is provided with a first observation window, and the second sealing device is provided with a second observation window.

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