Double-row series angular contact ball bearing

Abstract

The utility model relates to the field of bearings, and discloses a double-row series angular contact ball bearing, which comprises an outer ring (10) and an inner ring (11), two rows of rolling bodies (12) are arranged between the outer ring (10) and the inner ring (11), the outer ring (10) surrounds the outer side of the inner ring (11), at least two flanges (101) used for being connected with a supporting unit are arranged at the end part of the outer ring (10), all the flanges (101) are uniformly distributed on the outer ring (10), and the inner ring (11) is arranged on the outer ring (10). And the flange (101) is provided with a mounting hole (102) for a bolt to pass through. A flange is additionally arranged on the outer ring and connected with the end face of the supporting unit through a bolt, higher connecting strength can be provided, axial pre-tightening force can be generated, and therefore the rotating precision of the bearing is improved, the rigidity of the bearing device is improved, the number of rolling bodies borne in the bearing is increased, the rationality of load distribution in the bearing is improved, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of bearings, and more particularly to double-row tandem angular contact ball bearings. Background Technology

[0002] In applications where bearings need to withstand large radial and unidirectional axial loads, tapered roller bearings are typically used. Tapered roller bearings have a high load-carrying capacity, meeting the requirements of such applications. However, tapered roller bearings also have the following disadvantages: the rollers and raceways are in line contact, resulting in higher frictional resistance, leading to higher heat generation and vibration, which in turn affects the bearing's energy consumption, speed, and efficiency during operation.

[0003] Angular contact ball bearings effectively address the shortcomings of tapered roller bearings. In angular contact ball bearings, the steel balls and raceways make point contact, significantly reducing frictional resistance. This effectively reduces frictional losses, heat generation, and vibration, improving the energy efficiency and speed stability of bearing operation, thus meeting energy-saving and noise-reduction performance requirements. However, single-row angular contact ball bearings have limited load-bearing capacity and cannot meet the requirements when facing large combined loads. Therefore, a double-row tandem configuration is necessary to enhance their load-bearing capacity.

[0004] Traditional double-row tandem angular contact ball bearings assemble their outer rings with the support unit via an interference fit, such as the double-row tandem angular contact ball bearing disclosed in CN 114135571 A. While this structure enhances load-bearing capacity through its double-row angular contact structure and improves lubrication through oil groove design, it lacks an axial preload adjustment mechanism. This can lead to unstable axial clearance and axial movement, reducing bearing motion accuracy and impacting performance. Especially in high-precision transmission scenarios or under conditions with large load fluctuations, traditional structures struggle to guarantee stable axial positioning accuracy, limiting their application in high-end equipment and new energy fields. Therefore, there is an urgent need for a novel bearing solution that retains the low friction and high flexibility advantages of double-row tandem angular contact ball bearings while achieving precise axial preload control through structural innovation. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a double-row tandem angular contact ball bearing.

[0006] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0007] A double-row tandem angular contact ball bearing includes an outer ring and an inner ring, with two rows of rolling elements installed between the outer and inner rings. The outer ring surrounds the outer ring. The end of the outer ring is provided with a flange for connection with a support unit. There are at least two flanges, all of which are evenly distributed on the outer ring. The flanges are provided with mounting holes for bolts to pass through.

[0008] Preferably, the two rows of rolling elements are respectively mounted on the first cage and the second cage, the first cage and the second cage are interlocked, and there is a gap between the first cage and the second cage.

[0009] Preferably, the outer end of the first retainer is provided with a number of first grooves, the outer end of the second retainer is provided with a number of second grooves, the inner end of the first retainer is provided with a number of slots, and the inner end of the second retainer is provided with a number of protrusions equal to the number of slots. The first retainer is engaged with the protrusions of the second retainer through the slots.

[0010] Preferably, the outer ring is provided with a first outer groove and a second outer groove, one row of rolling elements is installed on the first outer groove, and another row of rolling elements is installed on the second outer groove. The first outer groove is provided with a first outer shoulder on both sides, and the second outer groove is provided with a second outer shoulder on the outer side.

[0011] Preferably, an outer oil groove for storing lubricating oil is provided between the first outer groove and the second outer groove.

[0012] Preferably, the inner ring is provided with a first inner groove and a second inner groove, one row of rolling elements is installed on the first inner groove, and another row of rolling elements is installed on the second inner groove. The outer side of the first inner groove is provided with a first inner shoulder, and the inner side of the second inner groove is provided with a second inner shoulder.

[0013] Preferably, an inner oil groove for storing lubricating oil is provided between the first inner groove and the second inner groove.

[0014] Preferably, the contact angle α1 of the first row of rolling elements is in the same direction as the contact angle α2 of the second row of rolling elements.

[0015] This utility model, by adopting the above technical solution, has significant technical effects:

[0016] This bearing can reduce rotational resistance, reduce friction between rolling elements and raceways, and reduce vibration and noise, while ensuring that it can withstand large radial and axial loads to meet the needs of various applications.

[0017] Structurally, the outer ring is reinforced with a flange, which is bolted to the end face of the support unit. This provides higher connection strength and generates axial preload, thereby improving the bearing's rotational accuracy, increasing the rigidity of the bearing assembly, increasing the number of rolling elements inside the bearing, improving the rationality of the load distribution inside the bearing, and extending the bearing's service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 yes Figure 1 The diagram shows a structure without ball bearings installed.

[0020] Figure 3 This is a schematic diagram of the structure after the first and second cages are assembled.

[0021] Figure 4 This is a schematic diagram of the bearing mounted on the support unit.

[0022] Figure 5 This is a schematic diagram of a traditional bearing mounted on a support unit.

[0023] The names of the body parts referred to by the numbers in the above attached diagrams are as follows:

[0024] 10—Outer ring, 101—Flange, 102—Mounting hole, 103—First outer groove, 104—Second outer groove, 105—First outer shoulder, 106—Second outer shoulder, 107—Outer oil groove

[0025] 11—Inner ring, 111—First inner groove, 112—Second inner groove, 113—First inner shoulder, 114—Second inner shoulder, 115—Inner oil groove

[0026] 12—Rolling element

[0027] 13—First cage, 131—First roller groove, 132—Slot section

[0028] 14—Second cage, 141—Second groove, 142—Protrusion

[0029] 15—Support Unit Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 The present invention will be further described in detail with reference to the embodiments.

[0031] Example 1

[0032] A double-row tandem angular contact ball bearing includes an outer ring 10 and an inner ring 11. Two rows of rolling elements 12 are installed between the outer ring 10 and the inner ring 11. In this embodiment, the rolling elements 12 are steel balls. The outer ring 10 surrounds the outer ring 11. The end of the outer ring 10 is provided with flanges 101 for connection to a support unit. There are at least two flanges 101; in this embodiment, there are four flanges 101, evenly distributed on the outer ring 10. Each flange 101 has mounting holes 102 for bolts to pass through. The flanges 101 are bolted to the end face of the support unit 15, providing higher connection strength and generating axial preload, thereby improving the bearing's rotational accuracy, increasing the rigidity of the bearing assembly, increasing the number of bearing-bearing rolling elements 12, improving the rationality of the internal load distribution of the bearing, and extending the bearing's service life.

[0033] Two rows of rolling elements 12 are respectively mounted on a first cage 13 and a second cage 14, which are interlocked and connected with each other, with a gap between them. The interlocking action of the cages ensures that the two rows of rolling elements rotate nearly synchronously, thereby improving the smoothness of bearing operation. Simultaneously, it allows the two rows of rolling elements to be evenly distributed, resulting in a more uniform axial load distribution between them, preventing overload problems caused by concentrated loads in a single row, and improving the overall bearing reliability and stability.

[0034] The outer end of the first retainer 13 is provided with a number of first grooves 131, the outer end of the second retainer 14 is provided with a number of second grooves 141, the inner end of the first retainer 13 is provided with a number of slots 132, and the inner end of the second retainer 14 is provided with a number of protrusions 142 equal to the number of slots 132. The first retainer 13 is engaged with the protrusions 142 of the second retainer 14 through the slots 132. The first groove 131 at the outer end of the first cage 13 and the second groove 141 at the outer end of the second cage 14 provide positioning and rolling space for the two rows of steel balls, ensuring uniform distribution and smooth operation of the steel balls. The slot 132 at the inner end of the first cage 13 and the protrusion 142 at the inner end of the second cage 14 are connected by a snap-fit ​​to form a rigid linkage structure, which can force the two rows of steel balls to rotate synchronously, reduce vibration and uneven load caused by speed difference, and at the same time, through the matching accuracy of the slot and the protrusion, the axial position of the two rows of steel balls is accurately aligned, improving the overall smoothness of bearing operation and the uniformity of load distribution, and avoiding local overload or abnormal wear caused by uneven force.

[0035] The outer ring 10 is provided with a first outer groove 103 and a second outer groove 104. One row of rolling elements 12 is installed on the first outer groove 103 and another row of rolling elements 12 is installed on the second outer groove 104. The first outer groove 103 is provided with a first outer shoulder 105 on both sides and the second outer groove 104 is provided with a second outer shoulder 106 on the outer side. The outer ring 10 is provided with a first outer groove 103 and a second outer groove 104, which respectively support two rows of rolling elements 12, forming a double-row series structure. It can simultaneously bear radial and axial loads, thereby improving the overall load-bearing capacity of the bearing. The 12th outer shoulder 105 on both sides of the first outer groove 103 and the second outer shoulder 106 on the outer side of the second outer groove 104 provide axial positioning and guidance for the rolling elements 12 in the corresponding grooves, restrict the axial movement of the rolling elements 12, and ensure that the two rows of rolling elements 12 run stably in their respective grooves. At the same time, the shoulder structure enhances the rigidity of the outer ring 10, improves the uniformity of load distribution, avoids local stress concentration caused by rolling element misalignment, and improves the bearing's operational reliability and service life.

[0036] An outer oil groove 107 for storing lubricating oil is provided between the first outer raceway 103 and the second outer raceway 104. The outer oil groove 107 between the first outer raceway 103 and the second outer raceway 104 of the outer ring 10 can store lubricating oil and form a local circulation loop. During the operation of the bearing, it continuously provides lubrication to the raceways where the two rows of rolling elements 12 are located, avoiding insufficient lubrication caused by the long lubrication distance due to splashing of the main bevel gear or the difference in viscosity of the oil at low temperature. It reduces friction and wear between the raceway and the rolling elements, reduces the risk of burning, and at the same time, the flow of lubricating oil in the outer oil groove 107 can help dissipate heat, improve the stability and service life of the bearing under high load conditions.

[0037] The inner ring 11 has a first inner groove 111 and a second inner groove 112. One row of rolling elements is mounted on the first inner groove 111, and another row of rolling elements 12 is mounted on the second inner groove 112. A first inner shoulder 113 is provided on the outer side of the first inner groove 111, and a second inner shoulder 114 is provided on the inner side of the second inner groove 112. The inner ring 11 has a first inner groove 111 and a second inner groove 112, which respectively support the two rows of rolling elements 12. The double-row tandem structure enhances the bearing's combined load-bearing capacity for radial and axial loads. The first inner shoulder 113 on the outer side of the first inner groove 111 and the second inner shoulder 114 on the inner side of the second inner groove 112 provide axial restraint for the rolling elements 12 in the corresponding grooves, preventing the rolling elements from moving axially and ensuring that the two rows of rolling elements run stably in their respective grooves. At the same time, the shoulder structure improves the structural rigidity of the inner ring 11, evenly distributes the load, avoids abnormal wear or failure caused by local stress concentration, and improves the bearing's reliability and lifespan.

[0038] An inner oil groove 115 for storing lubricating oil is provided between the first inner groove 111 and the second inner groove 112. The inner oil groove 115 between the first inner groove 111 and the second inner groove 112 of the inner ring 11 can store lubricating oil and form a local circulating oil circuit. During bearing operation, it continuously provides lubrication to the grooves where the two rows of rolling elements are located, avoiding the burning problem caused by insufficient lubrication in the main cone part and reducing friction and wear between the raceway and the rolling elements. At the same time, the oil storage structure of the inner oil groove 115 can maintain the lubrication effect at low temperature or high oil viscosity, improve the reliability of the bearing under complex working conditions, and the lubricating oil can help reduce the temperature of the inner ring area during the flow process, enhance the heat dissipation performance of the bearing, and extend its service life.

[0039] The contact angle α1 of the first row of rolling elements 12 and the contact angle α2 of the second row of rolling elements 12 are in the same direction. In this embodiment, the contact angle α1 of the first row of rolling elements 12 and the contact angle α2 of the second row of rolling elements 12 are the same size. The fact that the contact angle α1 of the first row of rolling elements 12 and the contact angle α2 of the second row of rolling elements 12 are in the same direction allows the two rows of rolling elements to form axial force in the same direction when bearing axial load, which works together to resist external axial force and enhance the overall axial load-bearing capacity of the bearing. At the same time, the same contact angle design facilitates the adjustment of axial preload during bearing installation, ensures that the two rows of rolling elements are subjected to uniform force, avoids uneven load distribution or axial movement caused by differences in contact angle direction, improves the smoothness of bearing operation and the retention of precision, and is suitable for working conditions such as main reduction parts that need to stably bear unidirectional axial load.

[0040] Example 2

[0041] Example 2 is basically the same as Example 1, except that the contact angle α1 of the first row of rolling elements 12 and the contact angle α2 of the second row of rolling elements 12 are different.

Claims

1. A double-row tandem angular contact ball bearing, comprising an outer ring (10) and an inner ring (11), wherein two rows of rolling elements (12) are mounted between the outer ring (10) and the inner ring (11), and the outer ring (10) surrounds the outer side of the inner ring (11), characterized in that: The outer ring (10) has a flange (101) at its end for connecting with the support unit. There are at least two flanges (101), and all flanges (101) are evenly distributed on the outer ring (10). The flanges (101) have mounting holes (102) for bolts to pass through.

2. The double-row tandem angular contact ball bearing according to claim 1, characterized in that: Two rows of rolling elements (12) are respectively mounted on the first cage (13) and the second cage (14). The first cage (13) and the second cage (14) are interlocked and connected, and a gap is provided between the first cage (13) and the second cage (14).

3. The double-row tandem angular contact ball bearing according to claim 2, characterized in that: The first retainer (13) has a number of first grooves (131) at its outer end, and the second retainer (14) has a number of second grooves (141) at its outer end. The first retainer (13) has a number of slots (132) at its inner end, and the second retainer (14) has a number of protrusions (142) equal to the number of slots (132) at its inner end. The first retainer (13) is engaged with the protrusions (142) of the second retainer (14) through the slots (132).

4. The double-row tandem angular contact ball bearing according to claim 1, characterized in that: The outer ring (10) is provided with a first outer groove (103) and a second outer groove (104). One row of rolling elements (12) is installed on the first outer groove (103) and another row of rolling elements (12) is installed on the second outer groove (104). The first outer groove (103) is provided with a first outer shoulder (105) on both sides and the second outer groove (104) is provided with a second outer shoulder (106) on the outer side.

5. The double-row tandem angular contact ball bearing according to claim 4, characterized in that: An outer oil trough (107) for storing lubricating oil is provided between the first outer channel (103) and the second outer channel (104).

6. The double-row tandem angular contact ball bearing according to claim 1, characterized in that: The inner ring (11) is provided with a first inner groove (111) and a second inner groove (112). One row of rolling elements is installed on the first inner groove (111), and another row of rolling elements (12) is installed on the second inner groove (112). A first inner shoulder (113) is provided on the outer side of the first inner groove (111), and a second inner shoulder (114) is provided on the inner side of the second inner groove (112).

7. The double-row tandem angular contact ball bearing according to claim 6, characterized in that: An inner oil trough (115) for storing lubricating oil is provided between the first inner channel (111) and the second inner channel (112).

8. The double-row tandem angular contact ball bearing according to any one of claims 1-7, characterized in that: The contact angle α1 of the first row of rolling elements (12) is in the same direction as the contact angle α2 of the second row of rolling elements (12).

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