Composite double-row angular contact bearing for automotive fan support

Abstract

The utility model relates to bearing field, specifically disclose a kind of composite double-row angular contact bearing for automobile fan support. The composite double-row angular contact bearing includes the inner ring, intermediate sleeve ring and outer ring sequentially arranged from inside to outside along radial direction, and first rolling element is equipped between the inner ring and intermediate sleeve ring, and second rolling element is equipped between the intermediate sleeve ring and outer ring;The first rolling element and second rolling element are both double-row arrangement, and the axial spacing of two rows of first rolling elements is recorded as L1, and the axial spacing of two rows of second rolling elements is recorded as L2, then there is L1>L2;The axial center of two rows of second rolling elements is arranged offset relative to the axial center of two rows of first rolling elements, and offset distance is less than 0.5L1. The composite double-row angular contact bearing described above can simultaneously adapt axial load, radial load and eccentric load working condition, and the working demand of automobile fan is well satisfied.

Description

Technical Field

[0001] This utility model relates to the field of bearings, specifically to a composite double-row angular contact bearing for automotive fan brackets. Background Technology

[0002] The car fan is a key supporting component of the engine cooling system, primarily used to dissipate heat and cool the engine. Common car fans can be categorized by their drive method into electric drive and engine drive. Engine drive fans draw power directly from the car engine and connect directly to the fan. The car fan bracket is an important component of the car fan, used to secure the fan and ensure its precise alignment with the radiator.

[0003] The automotive fan and its bracket require bearings for support and connection. In addition to radial forces, the fan's own weight, centrifugal force, and rotational deflection torque, the bearings mounted on the fan bracket must also withstand the high temperatures near the engine and the corrosive effects of dust and sediment. In such harsh operating conditions, the bearings must possess high load-bearing capacity, resistance to rotational deflection torque, withstand high temperatures, and maintain high sealing performance.

[0004] In conventional bearings, angular contact ball bearings can withstand both axial and radial loads simultaneously, but a single bearing is difficult to adapt to the off-center load conditions of automotive fans. While using multiple bearings together can meet the needs of automotive fans, it inevitably leads to increased assembly difficulty, higher costs, and excessive weight, making it unsuitable for widespread application. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a composite double-row angular contact bearing for automotive fan brackets, which can simultaneously adapt to axial load, radial load and off-center load conditions, and well meet the working requirements of automotive fans.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: A composite double-row angular contact bearing for an automotive fan bracket includes an inner ring, a middle ring, and an outer ring arranged radially from the inside to the outside. A first rolling element is provided between the inner ring and the middle ring, and a second rolling element is provided between the middle ring and the outer ring. The first and second rolling elements are both arranged in two rows. The axial distance between the two rows of first rolling elements is denoted as L1, and the axial distance between the two rows of second rolling elements is denoted as L2. Then, L1 > L2. The axial center of the two rows of second rolling elements is offset from the axial center of the two rows of first rolling elements, and the offset distance is less than 0.5L1.

[0007] In use, the inner ring of this application is fitted around the engine's output shaft and rotates synchronously with it. The outer ring is connected to the car fan and rotates synchronously with it. The middle ring is connected to the clutch and does not rotate. When the engine is running, the output shaft rotates continuously. When the clutch is disengaged, the car fan does not rotate, and the outer ring of the bearing does not rotate. When the clutch is engaged, the car fan, the outer ring, and the inner ring rotate in the same direction.

[0008] Double-row angular contact ball bearings can simultaneously withstand axial and radial loads. The load-bearing capacity of an automotive fan can be met by appropriately increasing the axial spacing between the two rows of bearings. The internal and external distribution of the first and second rolling elements effectively improves load-bearing capacity. The different spacing and offset axial centers of the first and second rolling elements allow for better adaptation to off-center load conditions and smoother operation by selecting a suitable installation direction.

[0009] Preferably, the inner ring is divided into two inner sections along the axial direction, and each of the two inner sections has a raceway corresponding to the first rolling element on its outer side.

[0010] Preferably, the opposite sides of the two inner sections are the inner sides, and the inner side of the raceway of each inner section is not provided with a retaining edge, or the inner retaining edge is lower than the outer retaining edge.

[0011] Preferably, two first sealing covers are provided between the inner ring and the intermediate sleeve ring, and the first rolling element is disposed between the two first sealing covers. The first sealing covers move synchronously with the intermediate sleeve ring and slide in contact with the outer side of the inner ring.

[0012] Preferably, the inner side of the intermediate ring has two annular first slots, and the outer side of the inner ring has two annular sealing grooves. The bottom surface of the sealing groove is the first sealing surface, and the side near the first rolling element is the second sealing surface. The groove is opened on one side of the first rolling element. The outer edge of the first sealing cover is embedded in the first slot, and the inner edge is provided with three inner sealing lips. The first inner sealing lip slides in contact with the first sealing surface, the second inner sealing lip slides in contact with the second sealing surface, and the third sealing lip extends toward the first rolling element and forms a throttling sealing channel with the second sealing surface or the outer side of the inner ring.

[0013] A reliable sealing space is formed between the inner ring and the middle ring, preventing external impurities from entering and internal grease from flowing out. This creates a relatively stable operating environment for the first rolling element, adapting to the high temperature and dusty environment of the automotive fan and improving its service life.

[0014] Preferably, two second sealing covers are provided between the intermediate ring and the outer ring, and the second rolling element is disposed between the two second sealing covers. The second sealing covers move synchronously with the outer ring and slide in contact with the outer side of the intermediate ring.

[0015] Preferably, the inner side of the outer ring has two annular rings disposed in the second slot; the outer ring of the second sealing cover is embedded in the second slot, and the inner edge is provided with two outer sealing lips, which are distributed sequentially along the axial direction and respectively slide in contact with the outer side of the middle ring.

[0016] A reliable sealing space is formed between the outer ring and the middle ring, preventing external impurities from entering and internal grease from flowing out. This creates a relatively stable operating environment for the second rolling element, adapting to the high temperature and dusty environment of the automotive fan and improving its service life.

[0017] Preferably, the two end faces of the intermediate ring protrude from the corresponding end faces of the inner ring and the corresponding end faces of the outer ring, respectively.

[0018] Preferably, the two end faces of the intermediate collar are provided with a plurality of threaded holes.

[0019] The two ends of the middle collar are used to connect with external components, and the protruding design can avoid interference with the inner and outer collars. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the composite double-row angular contact bearing used in the automotive fan bracket of this embodiment; Figure 2 This is a half-sectional view of the composite double-row angular contact bearing used in the automotive fan bracket of this embodiment; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 2 A magnified view of a section at point B in the middle. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example

[0022] like Figure 1 and Figure 2As shown, a composite double-row angular contact bearing for an automotive fan bracket includes an inner ring 3, a middle ring 2, and an outer ring 1 arranged radially from the inside to the outside. A first rolling element 7 is provided between the inner ring 3 and the middle ring 2, and a second rolling element 4 is provided between the middle ring 2 and the outer ring 1.

[0023] like Figure 1 and Figure 2 As shown, the first rolling element 7 and the second rolling element 4 are both arranged in two rows. The axial distance between the two rows of the first rolling element 7 is denoted as L1, and the axial distance between the two rows of the second rolling element 4 is denoted as L2, so L1 > L2. The axial center of the two rows of the second rolling element 4 is offset from the axial center of the two rows of the first rolling element 7, and the offset distance is less than 0.5L1.

[0024] Specifically, such as Figure 1 and Figure 2 As shown, the two end faces of the intermediate collar 2 protrude from the corresponding end faces of the inner ring 3 and the outer ring 1, respectively. The two end faces of the intermediate collar 2 are each provided with a plurality of threaded holes 8. The two ends of the intermediate collar 2 are used for connection with external components, and the protruding design avoids interference with the inner ring 3 and the outer ring 1.

[0025] Specifically, such as Figure 1 and Figure 2 As shown, the inner ring 3 is divided into two inner sections along the axial direction, and each of the two inner sections has a raceway corresponding to the first rolling element 7 on its outer side. The opposite sides of the two inner sections are the inner sides, and the inner side of the raceway on each inner section is not provided with a retaining edge, or the inner retaining edge is lower than the outer retaining edge.

[0026] Double-row angular contact ball bearings can simultaneously withstand axial and radial loads. The load-bearing capacity of an automotive fan can be met by appropriately increasing the axial spacing between the two rows of bearings. The internal and external distribution of the first rolling element 7 and the second rolling element 4 effectively improves the load-bearing capacity. The different spacing between the first rolling element 7 and the second rolling element 4, and their offset axial centers, allow for better adaptation to off-center load conditions and smoother operation by appropriately selecting the installation direction.

[0027] Furthermore, such as Figure 2 and Figure 4 As shown, two first sealing covers 6 are provided between the inner ring 3 and the middle sleeve ring 2. The first rolling element 7 is disposed between the two first sealing covers 6. The first sealing covers 6 move synchronously with the middle sleeve ring 2 and slide in contact with the outer side of the inner ring 3.

[0028] Specifically, such as Figure 2 and Figure 4As shown, the inner side of the intermediate ring 2 has two annular first slots, and the outer side of the inner ring 3 has two annular sealing grooves. The bottom surface of the sealing groove is the first sealing surface, and the side near the first rolling element 7 is the second sealing surface. The sealing grooves are opened on one side of the first rolling element 7. The outer edge of the first sealing cover 6 is embedded in the first slot, and the inner edge has three inner sealing lips 61. The first inner sealing lip 61 slides in contact with the first sealing surface, the second inner sealing lip 61 slides in contact with the second sealing surface, and the third sealing lip extends towards the first rolling element 7 and forms a throttling sealing channel with the second sealing surface or the outer side of the inner ring 3.

[0029] A reliable sealing space is formed between the inner ring 3 and the intermediate ring 2 to prevent external impurities from entering and to prevent internal grease from flowing out. This creates a relatively stable operating environment for the first rolling element 7, adapting to the high temperature and dust environment of the automotive fan and improving its service life.

[0030] Furthermore, such as Figure 2 and Figure 3 As shown, two second sealing covers 5 are provided between the middle ring 2 and the outer ring 1. The second rolling element 4 is disposed between the two second sealing covers 5. The second sealing covers 5 move synchronously with the outer ring 1 and slide in contact with the outer side of the middle ring 2.

[0031] Specifically, such as Figure 2 and Figure 3 As shown, the inner side of the outer ring 1 has two annular openings in the second slot; the outer ring 1 of the second sealing cover 5 is embedded in the second slot, and the inner edge is provided with two outer sealing lips 51. The two outer sealing lips 51 are distributed sequentially along the axial direction and respectively slide in contact with the outer side of the middle ring 2.

[0032] A reliable sealing space is formed between the outer ring 1 and the middle ring 2 to prevent external impurities from entering and to prevent internal grease from flowing out. This creates a relatively stable operating environment for the second rolling element 4, adapting to the high temperature and dust environment of the automotive fan and improving its service life.

[0033] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite double-row angular contact bearing for automotive fan brackets, characterized in that: It includes an inner ring, a middle ring and an outer ring arranged radially from the inside to the outside, wherein a first rolling element is provided between the inner ring and the middle ring, and a second rolling element is provided between the middle ring and the outer ring; The first and second rolling elements are both arranged in two rows. The axial distance between the two rows of first rolling elements is denoted as L1, and the axial distance between the two rows of second rolling elements is denoted as L2. Then, L1 > L2. The axial center of the two rows of second rolling elements is offset from the axial center of the two rows of first rolling elements, and the offset distance is less than 0.5L1.

2. The composite double-row angular contact bearing according to claim 1, characterized in that: The inner ring is divided into two inner sections along the axial direction, and each of the two inner sections has a raceway corresponding to the first rolling element on its outer side.

3. The composite double-row angular contact bearing according to claim 2, characterized in that: The opposite sides of the two inner sections are the inner sides, and the inner side of the raceway of each inner section is not provided with a retaining edge, or the inner retaining edge is lower than the outer retaining edge.

4. The composite double-row angular contact bearing according to claim 1, characterized in that: Two first sealing covers are provided between the inner ring and the intermediate sleeve ring. The first rolling element is disposed between the two first sealing covers. The first sealing covers move synchronously with the intermediate sleeve ring and slide in contact with the outer side of the inner ring.

5. The composite double-row angular contact bearing according to claim 4, characterized in that: The inner side of the intermediate ring has two annular first slots, and the outer side of the inner ring has two annular sealing grooves. The bottom surface of the sealing groove is the first sealing surface, and the side near the first rolling element is the second sealing surface. The groove is opened on one side of the first rolling element. The outer edge of the first sealing cover is embedded in the first slot, and the inner edge is provided with three inner sealing lips. The first inner sealing lip slides in contact with the first sealing surface, the second inner sealing lip slides in contact with the second sealing surface, and the third sealing lip extends toward the first rolling element and forms a throttling sealing channel with the second sealing surface or the outer side of the inner ring.

6. The composite double-row angular contact bearing according to claim 1, characterized in that: Two second sealing covers are provided between the middle ring and the outer ring. The second rolling element is disposed between the two second sealing covers. The second sealing covers move synchronously with the outer ring and slide in contact with the outer side of the middle ring.

7. The composite double-row angular contact bearing according to claim 6, characterized in that: The inner side of the outer ring has two annular openings in the second slot; the outer ring of the second sealing cover is embedded in the second slot, and the inner edge is provided with two outer sealing lips, which are distributed sequentially along the axial direction and slide in contact with the outer side of the middle ring respectively.

8. The composite double-row angular contact bearing according to any one of claims 1-7, characterized in that: The two end faces of the intermediate collar protrude from the corresponding end faces of the inner ring and the outer ring, respectively.

9. The composite double-row angular contact bearing according to claim 8, characterized in that: The two end faces of the intermediate collar are respectively provided with several threaded holes.

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