Spherical roller bearing

Abstract

The utility model discloses a kind of self-aligning roller bearings, including coaxially arranged inner ring and outer ring, two rows of inner raceways are provided on the inner ring outer wall, two rows of outer raceways are provided on the outer ring inner wall, two rows of rollers are correspondingly provided between the inner raceway and outer raceway, the roller is installed on retainer, the roller is obliquely arranged, two rows of rollers are also in the baffle ring, the baffle ring has two contact surfaces respectively with the side wall of two rows of rollers, the contact surface is set as arc surface. Its stable and reliable structure guarantees the stability of baffle ring guiding roller end face, while guiding frictional resistance is small, with lower production cost, effectively improve finished product market competitiveness.

Description

Technical Field

[0001] This utility model relates to a self-aligning roller bearing. Background Technology

[0002] Self-aligning roller bearings primarily bear radial loads, but can also withstand axial loads in any direction. They have high radial load capacity and are suitable for heavy-duty or vibration-loaded applications. They require a smooth guide ring for the rollers with low friction. Currently, the self-aligning roller bearings designed in the bearing industry use a guide ring with tapered surfaces on both sides to guide the rollers. One existing structure features a guide ring with a spherical base surface on the inner end face of the roller. The contact point between the guide ring and the inner end face of the roller is at the middle of the two end faces of the guide ring. This ensures smooth guidance of the roller end face with low frictional resistance. However, the low production efficiency of grinding the spherical base surface results in high costs for spherical base surface rollers, preventing large-scale supply and reducing the company's production efficiency. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a self-aligning roller bearing with a stable and reliable structure that ensures the smooth guidance of the roller end face by the intermediate retaining ring. At the same time, it has low guiding friction resistance, lower production costs, and effectively improves the market competitiveness of the finished product.

[0004] To achieve the above objectives, this utility model provides a self-aligning roller bearing, comprising an inner ring and an outer ring coaxially arranged. The outer peripheral wall of the inner ring is provided with two rows of inner raceways, and the inner peripheral wall of the outer ring is provided with two rows of outer raceways. Two rows of rollers are correspondingly arranged between the inner raceways and the outer raceways. The rollers are mounted on a cage. The bearing is characterized in that the rollers are inclined, and a middle retaining ring is provided between the two rows of rollers. The middle retaining ring has two contact surfaces that respectively contact the side walls of the two rows of rollers, and the contact surfaces are configured as arc-shaped surfaces.

[0005] The advantages of this design are as follows: It eliminates the high-cost structure of a straight tapered inner retaining ring and a spherical roller base. The arc-shaped contact surface of the inner retaining ring forms a line contact with the flat roller, with the contact area concentrated in the middle region of the inner retaining ring's end face. Compared to traditional point contact, the contact area is more reasonable, significantly reducing frictional resistance and minimizing wear between the roller and the inner retaining ring. The arc-shaped contact surface guides the roller smoothly from the non-stressed area to the stressed area, avoiding roller posture fluctuations caused by contact point misalignment. This adapts to the working requirements under heavy loads and vibration loads, meeting the core application scenarios of self-aligning roller bearings. Line contact reduces local stress concentration, lowers fatigue damage to the contact surface between the roller end face and the inner retaining ring, and extends the wear cycle of core components.

[0006] As a further feature of this invention, a receiving space is formed between the retainer and the inner ring, the middle retainer is disposed in the receiving space, the outer peripheral wall of the middle retainer is in contact with the retainer, and the inner peripheral wall of the middle retainer is in contact with the outer peripheral wall of the inner ring.

[0007] The beneficial effects of this design are as follows: This configuration creates a bidirectional limiting space for the inner ring and cage, preventing the intermediate retaining ring from moving radially and axially, ensuring stable contact between the arc-shaped contact surface and the rollers, and further enhancing guiding stability. The intermediate retaining ring simultaneously contacts the inner ring and cage, forming a linked support structure that reduces independent vibration of individual components and improves the overall structural rigidity of the bearing.

[0008] As a further feature of this invention, the retainer is configured in two rows and is positioned corresponding to the position of each row of rollers, and the outer peripheral wall of the middle retainer ring contacts the two retainers respectively.

[0009] The beneficial effects of this configuration are as follows: The two rows of cages provide symmetrical support to the center retaining ring from both sides, preventing unilateral force shift on the center retaining ring and ensuring uniform contact pressure between the arc-shaped contact surfaces on both sides of the center retaining ring and the two rows of rollers, resulting in stronger guidance consistency. Each row of cages corresponds to one row of rollers, and together with the guiding function of the center retaining ring, forms a dual constraint of cage limiting and center retaining ring guiding, reducing attitude deviations during roller tilting and minimizing edge wear between the rollers and the raceway.

[0010] As a further feature of this invention, the retainer is configured in two rows and is positioned corresponding to the position of each row of rollers, and the middle retaining ring is positioned between the retainer and the outer ring.

[0011] The advantages of this configuration are: with this configuration, the outer ring, as the fixed component of the bearing, has higher rigidity than the inner ring. The middle retaining ring is supported and positioned by the outer ring side, resulting in higher positioning accuracy and less impact from the displacement of the inner ring, such as self-aligning movements. The contact between the middle retaining ring and the outer ring allows frictional heat to be quickly dissipated to the external environment through the outer ring, preventing the accumulation of high temperatures inside the bearing.

[0012] As a further feature of this invention, the outer peripheral wall of the middle retaining ring is in contact with the inner wall of the outer ring, and the inner peripheral wall of the middle retaining ring is in contact with the two retainers respectively.

[0013] The advantages of this design are as follows: With this configuration, the center retainer ring achieves dual radial and axial positioning through bidirectional contact with the outer ring cage. This positioning accuracy far exceeds that of single-contact positioning, completely preventing center retainer ring movement and ensuring extremely smooth roller guidance. The bidirectional contact forms a rigid connection between the center retainer ring, cage, and outer ring, reducing relative movement between components and lowering vibration and noise.

[0014] As a further feature of this invention, a space is formed between the outer peripheral wall of the middle retaining ring and the inner wall of the outer ring, and the inner peripheral wall of the middle retaining ring contacts the two retainers respectively.

[0015] The benefits of this design are as follows: The space between the intermediate and outer rings provides a buffer against thermal expansion, preventing the intermediate and outer rings from seizing due to thermal expansion during bearing operation and ensuring normal bearing operation. The space also serves as a grease reservoir, continuously replenishing grease to the contact areas between the intermediate ring, cage, and rollers, extending the effective lubrication cycle and reducing the frequency of lubrication maintenance. The non-contact design between the intermediate and outer rings avoids frictional wear between them, reducing energy consumption and component wear. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the first embodiment of the present utility model; Figure 2 This is a cross-sectional structural diagram of the second embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of the third embodiment of the present utility model; Figure 4 This is a cross-sectional structural diagram of the fourth embodiment of the present utility model; Detailed Implementation

[0017] This utility model provides a first embodiment of a self-aligning roller bearing, such as... Figure 1 As shown, it includes an inner ring 1 and an outer ring 2 arranged coaxially. The outer peripheral wall of the inner ring 1 is provided with two rows of inner raceways, and the inner peripheral wall of the outer ring 2 is provided with two rows of outer raceways. Two rows of rollers 3 are correspondingly arranged between the inner raceways and the outer raceways. The rollers 3 are mounted on a cage 4 and are inclined. There is also a middle retaining ring 5 between the two rows of rollers 3. The middle retaining ring 5 has two contact surfaces that respectively contact the side walls of the two rows of rollers 3. The contact surfaces are set as arc surfaces.

[0018] As a further feature of this embodiment, a receiving space is formed between the retainer 4 and the inner ring 1, the middle retainer 5 is disposed in the receiving space, the outer peripheral wall of the middle retainer 5 is in contact with the retainer 4, and the inner peripheral wall of the middle retainer 5 is in contact with the outer peripheral wall of the inner ring 1.

[0019] This utility model provides a second embodiment of a self-aligning roller bearing, such as... Figure 2As shown, it includes an inner ring 1 and an outer ring 2 arranged coaxially. The outer peripheral wall of the inner ring 1 is provided with two rows of inner raceways, and the inner peripheral wall of the outer ring 2 is provided with two rows of outer raceways. Two rows of rollers 3 are correspondingly arranged between the inner raceways and the outer raceways. The rollers 3 are mounted on a cage 4 and are inclined. There is also a middle retaining ring 5 between the two rows of rollers 3. The middle retaining ring 5 has two contact surfaces that respectively contact the side walls of the two rows of rollers 3. The contact surfaces are set as arc surfaces.

[0020] As a further feature of this embodiment, a receiving space is formed between the retainer 4 and the inner ring 1, the middle retainer 5 is disposed in the receiving space, the outer peripheral wall of the middle retainer 5 is in contact with the retainer 4, and the inner peripheral wall of the middle retainer 5 is in contact with the outer peripheral wall of the inner ring 1.

[0021] As a further feature of this embodiment, the retainer 4 is configured in two rows and is positioned corresponding to the position of each row of rollers 3, and the outer peripheral wall of the middle retainer ring 5 contacts the two retainers 4 respectively.

[0022] This utility model provides a third embodiment of a self-aligning roller bearing, such as... Figure 3 As shown, it includes an inner ring 1 and an outer ring 2 arranged coaxially. The outer peripheral wall of the inner ring 1 is provided with two rows of inner raceways, and the inner peripheral wall of the outer ring 2 is provided with two rows of outer raceways. Two rows of rollers 3 are correspondingly arranged between the inner raceways and the outer raceways. The rollers 3 are mounted on a cage 4 and are inclined. There is also a middle retaining ring 5 between the two rows of rollers 3. The middle retaining ring 5 has two contact surfaces that respectively contact the side walls of the two rows of rollers 3. The contact surfaces are set as arc surfaces.

[0023] As a further feature of this embodiment, the retainer 4 is configured in two rows and is positioned corresponding to the position of each row of rollers 3, and the middle retaining ring 5 is disposed between the retainer 4 and the outer ring 2.

[0024] As a further feature of this embodiment, the outer peripheral wall of the middle retaining ring 5 is in contact with the inner wall of the outer ring 2, and the inner peripheral wall of the middle retaining ring 5 is in contact with the two retainers 4 respectively.

[0025] This utility model provides a fourth embodiment of a self-aligning roller bearing, such as... Figure 4 As shown, it includes an inner ring 1 and an outer ring 2 arranged coaxially. The outer peripheral wall of the inner ring 1 is provided with two rows of inner raceways, and the inner peripheral wall of the outer ring 2 is provided with two rows of outer raceways. Two rows of rollers 3 are correspondingly arranged between the inner raceways and the outer raceways. The rollers 3 are mounted on a cage 4 and are inclined. There is also a middle retaining ring 5 between the two rows of rollers 3. The middle retaining ring 5 has two contact surfaces that respectively contact the side walls of the two rows of rollers 3. The contact surfaces are set as arc surfaces.

[0026] As a further feature of this embodiment, the retainer 4 is configured in two rows and is positioned corresponding to the position of each row of rollers 3, and the middle retaining ring 5 is disposed between the retainer 4 and the outer ring 2.

[0027] As a further feature of this embodiment, a space is formed between the outer peripheral wall of the middle baffle ring 5 and the inner wall of the outer ring 2, and the inner peripheral wall of the middle baffle ring 5 contacts the two retainers 4 respectively.

[0028] 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 self-aligning roller bearing, comprising an inner ring and an outer ring coaxially arranged, wherein two rows of inner raceways are provided on the outer peripheral wall of the inner ring, and two rows of outer raceways are provided on the inner peripheral wall of the outer ring, wherein two rows of rollers are correspondingly arranged between the inner raceways and the outer raceways, and the rollers are mounted on a cage, characterized in that: The rollers are inclined, and there is a middle retaining ring between the two rows of rollers. The middle retaining ring has two contact surfaces that respectively contact the side walls of the two rows of rollers, and the contact surfaces are set as arc surfaces.

2. The self-aligning roller bearing according to claim 1, characterized in that: A receiving space is formed between the cage and the inner ring, and the middle retaining ring is disposed in the receiving space. The outer peripheral wall of the middle retaining ring is in contact with the cage, and the inner peripheral wall of the middle retaining ring is in contact with the outer peripheral wall of the inner ring.

3. The self-aligning roller bearing according to claim 2, characterized in that: The cages are arranged in two rows and are positioned corresponding to the positions of the rollers in each row. The outer peripheral wall of the middle retainer ring contacts the two cages respectively.

4. The self-aligning roller bearing according to claim 1, characterized in that: The cage is configured in two rows and is positioned corresponding to the position of each row of rollers, and the middle retaining ring is positioned between the cage and the outer ring.

5. The self-aligning roller bearing according to claim 4, characterized in that: The outer peripheral wall of the middle retainer ring is in contact with the inner wall of the outer ring, and the inner peripheral wall of the middle retainer ring is in contact with the two retainers respectively.

6. The self-aligning roller bearing according to claim 4, characterized in that: A gap is formed between the outer peripheral wall of the middle retainer ring and the inner wall of the outer ring, and the inner peripheral wall of the middle retainer ring contacts the two retainers respectively.

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