Double-row angular contact ball bearing

Abstract

The utility model discloses a double row angular contact ball bearing, including the inner race and the outer race, be provided with two rows inner race raceway on the inner race, the inner race forms the boss between two rows inner race raceway, be provided with outer race raceway on the outer race, and two rows inner race raceway are provided with retainer respectively, the retainer includes the abutment and the pocket part, the abutment position setting and with adjacent retainer abutment abut, the pocket part cooperation has the ball, the ball and the rolling fit on outer race raceway, the inner race end face is provided with first slot on the corresponding inner race raceway position, the outer race end face is provided with second slot on the corresponding outer race raceway, first slot and second slot combination form the ball slot for adding steel ball. Its simple and compact structure, strong carrying capacity, convenient and efficient steel ball assembly simultaneously, has good use effect.

Description

Technical Field

[0001] This utility model relates to a double-row angular contact ball bearing. Background Technology

[0002] Double-row angular contact ball bearings are key transmission components in high-end and critical equipment such as aerospace, rail transportation, wind power equipment, and heavy machine tools. The bearing's load-bearing capacity and operational stability directly determine the reliability of the entire equipment. Currently, most conventional double-row angular contact ball bearings on the market are equipped with an external cage structure. This structure occupies the internal ball space of the outer ring, significantly limiting the number of steel balls that can be arranged given the fixed bearing dimensions. This results in a lower rated dynamic load, making it difficult to meet the heavy-load operating requirements of the equipment. Increasing the bearing's outer and inner diameters to improve load-bearing capacity is constrained by the compact integrated design of the entire machine, requiring modifications to the equipment mounting base and assembly structure, significantly increasing equipment modification costs and development cycles. Furthermore, traditional bearings use a single-sided, single-fill ball groove structure, resulting in a cumbersome steel ball filling process, low assembly efficiency, and uneven steel ball distribution after filling. This can easily lead to stress imbalance during high-speed, heavy-load operation, reducing transmission accuracy and bearing lifespan. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a double-row angular contact ball bearing with a simple and compact structure, strong load-bearing capacity, convenient and efficient steel ball assembly, and good performance.

[0004] To achieve the above objectives, this utility model provides a double-row angular contact ball bearing, including an inner ring and an outer ring. The inner ring has two rows of inner ring raceways, and a boss is formed between the two rows of inner ring raceways. The outer ring has an outer ring raceway. A cage is provided on each of the two rows of inner ring raceways. The cage includes an abutment portion and a pocket portion. The abutment portion is located corresponding to the boss position and abuts against the adjacent cage abutment portion. A ball is fitted in the pocket portion and rolls with the outer ring raceway. A first notch is provided on the end face of the inner ring corresponding to the inner ring raceway position, and a second notch is provided on the end face of the outer ring corresponding to the outer ring raceway. The first notch and the second notch combine to form a ball receiving groove for adding steel balls.

[0005] The advantages of this design are as follows: Traditional external cages, attached to the outer ring, have long occupied the ball space within the raceway, limiting the number of balls that can be arranged for the same dimensions. This makes it difficult to adapt the rated dynamic load to the operating conditions of heavy-duty equipment such as wind power and rail transportation. This new structure places the cage on the inner ring side, using a central boss to position the two cages against each other, completely freeing up the installation space inside the outer ring raceway. Without changing the overall outer diameter and installation dimensions of the bearing, the number of balls can be increased, effectively improving the bearing's rated dynamic load. The bearing capacity can be increased by 15% to 30%, and the original bearing can be replaced without modifying the equipment mounting base, saving on equipment modification costs. Meanwhile, the inner and outer ring notches together form an integrated ball groove, which can simultaneously complete the filling of two rows of balls. This eliminates the traditional single-sided slotted step-by-step ball filling mode, simplifies the assembly process, and greatly improves the mass production assembly efficiency. After the balls are filled, they are evenly and uniformly arranged, and the load distribution during the bearing operation is balanced. This avoids the problems of local wear and reduced transmission accuracy caused by uneven steel ball density, and effectively improves the stability of the bearing under high-speed and heavy-load conditions.

[0006] As a further feature of this invention, the inner walls of the first and second notches are respectively provided with insert grooves, and a stop block is inserted into the insert groove.

[0007] The advantages of this design are as follows: Without a stopper, the lubricating grease inside the raceway is easily thrown out through the gaps in the groove during continuous bearing rotation, causing rapid grease loss. Insufficient grease exacerbates dry friction and wear between the balls and the raceway, shortening the bearing's service life. The plug-in stopper seals the gaps in the ball groove, forming a sealed protective structure that prevents grease leakage and stabilizes the internal lubrication environment of the bearing. Simultaneously, impurities and dust can easily enter the raceway through the gaps in the ball groove during bearing operation. Hard impurities mixed between the balls can cause pitting corrosion on the raceway and scratches on the ball surface. The stopper, precisely fixed by the insert groove, can prevent external contaminants from entering the bearing cavity, improving the bearing's dustproof performance. The plug-in assembly structure is easy to assemble and disassemble. For subsequent inspection, repair, and ball addition, simply pull out the stopper to access the ball groove. Compared to welded or integrated sealing structures, this reduces the difficulty of later maintenance operations, retaining the ease of assembly of the combined ball groove while compensating for the sealing defects caused by slotting.

[0008] As a further feature of this invention, a grease reservoir is provided on the end face of the stop block facing the ball, and a grease reservoir is fitted in the grease reservoir.

[0009] The beneficial effects of this design are as follows: By pre-installing grease reservoirs within the retainer, the grease reservoirs can absorb and store a large amount of lubricating grease. As the bearing heats up and grease slowly leaks out, the grease reservoirs can slowly and continuously release grease, replenishing the lubrication to the ball and raceway friction pairs. This achieves long-term self-lubrication, significantly extending the bearing relubrication cycle, reducing the frequency of equipment downtime for grease replenishment, and improving the efficiency of continuous equipment operation. The grease reservoirs are integrated into the retainer, requiring no additional modifications to the inner and outer raceway structures, not occupying ball arrangement space, and not affecting the bearing's load-bearing capacity or external installation dimensions, thus adapting to the installation requirements of compact equipment. Long-term lubrication significantly reduces the coefficient of friction between the balls, raceways, and cage, reducing operational friction losses and temperature rise.

[0010] As a further feature of this invention, the outer wall of the stop block is provided with pressing texture.

[0011] The beneficial effects of this design are: the pressing texture on the outer wall increases the coefficient of friction between the hand and the outer wall of the stop, allowing for a firm gripping of the stop by hand, and enabling quick insertion and removal without the need for additional tools. This simplifies the assembly and disassembly process, shortens bearing assembly and subsequent maintenance time, and improves production and maintenance efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model; Figure 2 This is a cross-sectional structural diagram of the first embodiment of the present utility model; Figure 3 This is a structural schematic diagram of the second embodiment of the present utility model. Detailed Implementation

[0013] The first embodiment of the double-row angular contact ball bearing of this utility model is, for example... Figure 1 and Figure 2 As shown: It includes an inner ring 1 and an outer ring 2. The inner ring 1 is provided with two rows of inner ring raceways 11. A boss 12 is formed between the two rows of inner ring raceways 11 on the inner ring 1. The outer ring 2 is provided with an outer ring raceway 21. A retainer 3 is provided on each of the two rows of inner ring raceways 11. The retainer 3 includes an abutment portion and a pocket portion. The abutment portion is located at the position corresponding to the boss 12 and abuts against the abutment portion of the adjacent retainer 3. A ball 4 is fitted in the pocket portion. The ball 4 rolls with the outer ring raceway 21. A first notch 13 is provided on the end face of the inner ring 1 at the position corresponding to the inner ring raceway 11. A second notch 22 is provided on the end face of the outer ring 2 at the position corresponding to the outer ring raceway 21. The first notch 13 and the second notch 22 are combined to form a ball receiving groove for adding steel balls.

[0014] A second embodiment of the double-row angular contact ball bearing of this utility model is as follows: Figure 3As shown: It includes an inner ring 1 and an outer ring 2. The inner ring 1 is provided with two rows of inner ring raceways 11. A boss 12 is formed between the two rows of inner ring raceways 11 on the inner ring 1. The outer ring 2 is provided with an outer ring raceway 21. A retainer 3 is provided on each of the two rows of inner ring raceways 11. The retainer 3 includes an abutment portion and a pocket portion. The abutment portion is located at the position corresponding to the boss 12 and abuts against the abutment portion of the adjacent retainer 3. A ball 4 is fitted in the pocket portion. The ball 4 rolls with the outer ring raceway 21. A first notch 13 is provided on the end face of the inner ring 1 at the position corresponding to the inner ring raceway 11. A second notch 22 is provided on the end face of the outer ring 2 at the position corresponding to the outer ring raceway 21. The first notch 13 and the second notch 22 are combined to form a ball receiving groove for adding steel balls.

[0015] As a further feature of this embodiment, the inner walls of the first notch 13 and the second notch 22 are respectively provided with insert grooves, and a stop block 5 is inserted into the insert groove.

[0016] As a further feature of this embodiment, a grease reservoir is provided on the end face of the stop block 5 facing the ball 4, and a grease reservoir is fitted in the grease reservoir.

[0017] As a further feature of this embodiment, the outer wall of the stop 5 is provided with pressing texture.

[0018] The above examples are merely one preferred embodiment of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution are all included within the protection scope of this utility model.

Claims

1. A double-row angular contact ball bearing, comprising an inner ring and an outer ring, characterized in that: The inner ring has two rows of inner ring raceways, and a boss is formed between the two rows of inner ring raceways on the inner ring. The outer ring has an outer ring raceway, and a retainer is provided on each of the two rows of inner ring raceways. The retainer includes an abutment portion and a pocket portion. The abutment portion is located at the position corresponding to the boss and abuts against the abutment portion of the adjacent retainer. A ball is fitted in the pocket portion and rolls with the outer ring raceway. A first notch is provided on the end face of the inner ring corresponding to the position of the inner ring raceway, and a second notch is provided on the end face of the outer ring corresponding to the outer ring raceway. The first notch and the second notch combine to form a ball receiving groove for adding steel balls.

2. The double-row angular contact ball bearing according to claim 1, characterized in that: The inner walls of the first and second notches are respectively provided with insert grooves, and a stop block is inserted into the insert groove.

3. The double-row angular contact ball bearing according to claim 2, characterized in that: The end face of the stop block facing the ball has a grease reservoir, and grease reservoir is fitted with grease reservoir foam.

4. The double-row angular contact ball bearing according to claim 3, characterized in that: The outer wall of the stop block is provided with pressing texture.

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