High-temperature high-speed heavy load reinforced retainer needle bearing

Abstract

This invention discloses a reinforced cage needle roller bearing for high-temperature, high-speed, heavy-duty applications, belonging to the technical field of needle roller bearings. It includes a cage comprising two retaining end rings, with a pocket beam between the two end rings, forming a pocket. Each end ring has an inner surface, with an oil groove on the inner surface located at the pocket position. The pocket beam includes a side beam and a center beam, with locking edges and a center oil groove on both sides of the center beam. Locking points are provided on the outer corners of the locking edges. This invention utilizes the aforementioned reinforced cage needle roller bearing for high-temperature, high-speed, heavy-duty applications. By providing the side and center oil grooves on the cage to store lubricating oil, it continuously replenishes lubrication to the contact area between the needle rollers and the cage, reducing friction and temperature rise. Simultaneously, the locking point structure on the cage confines the needle rollers within the pocket, effectively preventing needle roller misalignment and ensuring smooth and efficient bearing operation.

Description

Technical Field

[0001] This invention relates to the field of needle roller bearing technology, and in particular to a reinforced cage needle roller bearing for high temperature, high speed and heavy load. Background Technology

[0002] Bearings are core components used to support rotating shafts, transmit loads, and ensure rotational accuracy. In power transmission and main equipment, their reliability often determines the overall lifespan and maintenance cycle of the machine. Needle roller bearings, with slender needle rollers as rolling elements, have a small radial cross-sectional height and high load-bearing capacity, and are widely used in various high-speed, heavy-duty joints.

[0003] Ideally, bearings rely on an oil film for isolation and lubrication. However, under high temperature and high speed conditions, the lubricating oil is more likely to evaporate due to heat. Once the oil film is interrupted, friction and local temperature rise increase dramatically, which accelerates the deterioration of the oil. At the same time, the strong centrifugal force and alternating impact brought by high speed will cause the needle rollers to shift in the pocket, ultimately limiting the rotational speed and load-bearing capacity.

[0004] Therefore, there is an urgent need for a needle roller bearing that can ensure oil film isolation and limit needle roller misalignment under high temperature and high speed conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a reinforced cage needle roller bearing for high-temperature, high-speed, heavy-duty applications. By providing side oil grooves and a central oil groove on the cage to store lubricating oil, when the lubricating oil is consumed due to high-temperature evaporation, the reserve lubricating oil in the oil groove can seep out in time to continuously replenish lubrication to the contact area between the needle rollers and the cage, reducing friction and temperature rise. At the same time, the locking point structure on the cage restricts the needle rollers within the pockets, effectively preventing needle roller deviation under the strong centrifugal force generated at high speeds, ensuring smooth and efficient bearing operation.

[0006] To achieve the above objectives, the present invention provides a reinforced cage needle roller bearing for high temperature, high speed, and heavy load, comprising an outer ring, a cage disposed within the outer ring, the cage comprising two retaining end rings, a pocket beam disposed between the two retaining end rings, a pocket being disposed between adjacent pocket beams, needle rollers disposed in the pocket, the retaining end rings comprising an inner surface of the end ring, an edge oil groove disposed on the inner surface of the end ring located at the pocket position, the pocket beam comprising an edge beam and a middle beam, locking edges and a middle oil groove disposed on both sides of the middle beam, and locking points disposed on the outer corners of the locking edges.

[0007] Preferably, the outer ring includes an inner ring surface and an outer ring surface, and the needle roller includes a needle roller working surface and a needle roller end, wherein the inner ring surface of the outer ring is in contact with the needle roller working surface.

[0008] Preferably, the end of the needle roller is in contact with the inner surface of the end ring at the position of the edge oil groove, and the working surface of the needle roller contacts the locking point.

[0009] Preferably, both ends of the side beam contact the working surface of the needle roller.

[0010] Preferably, a plurality of pocket beams are included between the two retaining end rings, the inner surface of the retaining end ring is connected to the side beam, and both ends of the middle beam are connected to the side beam.

[0011] Preferably, the retaining end ring has a circular structure, and the pocket beams are arranged in a circular array along the retaining end ring.

[0012] Preferably, the oil groove is formed on the locking edge.

[0013] Preferably, the side beam has an outer peripheral surface facing the outer ring, the outer peripheral surface of the side beam is flush with the outer peripheral cylindrical surface of the retaining end ring, and the outer peripheral surface of the middle beam is located radially inside the outer peripheral surface of the side beam.

[0014] Preferably, the retainer is made of low-carbon alloy steel, and the retainer as a whole is subjected to carbonitriding, quenching and low-temperature tempering treatment. The inner surface of the end ring that contacts the needle roller, the two ends of the side beam and the locking edge surface of the retainer are provided with a silver plating layer.

[0015] Preferably, the needle roller is subjected to quenching and low-temperature tempering treatment, and the hardness of the needle roller is 60-66 HRC.

[0016] Therefore, the present invention adopts the above-mentioned high-temperature, high-speed, heavy-duty reinforced cage needle roller bearing. By setting side oil grooves and middle oil grooves on the cage to store lubricating oil, when the lubricating oil is consumed due to high temperature evaporation, the reserve lubricating oil in the oil grooves can seep out in time to continuously replenish lubrication to the contact area between the needle rollers and the cage, reducing friction and temperature rise. At the same time, the locking point structure on the cage restricts the needle rollers in the pocket, effectively preventing the needle rollers from deviating under the strong centrifugal force generated by high speed, ensuring smooth and efficient operation of the bearing.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of a reinforced cage needle roller bearing for high temperature, high speed and heavy load according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the outer ring of an embodiment of a reinforced cage needle roller bearing for high temperature, high speed and heavy load according to the present invention; Figure 3 This is a schematic diagram of the outer ring structure of an embodiment of a reinforced cage needle roller bearing for high temperature, high speed and heavy load according to the present invention; Figure 4This is a schematic diagram of the needle roller structure of an embodiment of a reinforced cage needle roller bearing for high temperature, high speed and heavy load according to the present invention; Figure 5 This is a schematic diagram of the cage structure of an embodiment of a reinforced cage needle roller bearing for high temperature, high speed and heavy load according to the present invention; Figure 6 This is an enlarged structural schematic diagram of section A of an embodiment of a reinforced cage needle roller bearing for high temperature, high speed and heavy load of the present invention; Figure 7 This is a schematic cross-sectional view of the cage structure of an embodiment of a reinforced cage needle roller bearing for high temperature, high speed and heavy load according to the present invention.

[0019] Figure Labels 1. Outer ring; 2. Cage; 3. Needle roller; 4. Outer ring outer surface; 5. Outer ring inner surface; 6. End ring inner surface; 7. Needle roller working surface; 8. Needle roller end; 9. Cage end ring; 10. Side oil groove; 11. Side beam; 12. Middle beam; 13. Pocket; 14. Locking edge; 15. Locking point; 16. Middle oil groove. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Example 1 This invention provides a reinforced cage needle roller bearing for high temperature, high speed, and heavy load applications, such as... Figures 1-7 As shown, it includes an outer ring 1, which is the outermost annular part of the needle roller bearing. The outer ring surface 4 of the outer ring 1 is used for positioning with external structures such as the housing. The inner ring surface 5 of the outer ring 1 is used for contact with the needle roller 3.

[0023] A retainer 2 is provided inside the outer ring 1. The retainer 2 is a cage-like component that separates and positions a ring of needle rollers 3. The retainer 2 includes two retaining end rings 9, which are circular ring structures. Several pocket beams are provided between the two retaining end rings 9. The pocket beams are arranged in a circular array along the retaining end rings 9. There are pockets 13 between the pocket beams, and the needle rollers 3 are disposed in the pockets 13. The needle rollers 3 include a needle roller working surface 7 and a needle roller end 8. The retaining end rings 9 include an inner ring surface 6, and the inner ring surface 5 of the outer ring is in contact with the needle roller working surface 7.

[0024] The purlin includes a side beam 11 and a middle beam 12. The inner surface 6 of the end ring 9 is connected to the side beam 11, and the two ends of the middle beam 12 are connected to the side beam 11.

[0025] An oil groove 10 is provided on the inner surface 6 of the end ring located at the pocket 13. The needle roller end 8 fits against the inner surface 6 of the end ring at the position of the oil groove 10. The oil groove 10 is a groove formed on the inner surface 6 of the end ring to store lubricating oil, so that when the lubricating oil is insufficient, it can be continuously supplied to the contact friction area between the needle roller end 8 and the inner surface 6 of the end ring.

[0026] Locking edges 14 are provided on both sides of the central beam 12, and locking points 15 are provided on the outer corners of the locking edges 14. The locking points 15 contact the working surface 7 of the needle roller to prevent the needle roller 3 from being thrown or deviated from the pocket 13. The two ends of the side beam 11 contact the working surface 7 of the needle roller to support the rotation of the needle roller 3.

[0027] The center beam 12 is also provided with oil grooves 16 at both ends. The oil grooves 16 are located at the locking edge 14 of the center beam 12. The oil grooves 16 are used to store lubricating oil so that when the lubricating oil is insufficient, it can be continuously supplied to the contact friction area between the needle roller working surface 7 and the cage 2.

[0028] The side beam 11 has an outer peripheral surface facing the outer ring 1, which is flush with the outer peripheral cylindrical surface of the retaining end ring 9. The outer peripheral surface of the middle beam 12 is located radially inside the outer peripheral surface of the side beam 11. This structural arrangement is used to ensure that the needle roller 3 can be locked in the retainer 2.

[0029] The cage 2 is made of low-carbon alloy steel. The entire cage 2 is treated with carbonitriding, quenching and low-temperature tempering to obtain a high-carbon tempered martensite structure in the infiltrated layer, while the core maintains high toughness. In this embodiment, the material of the cage 2 is 15CrMo, the surface hardness of the cage 2 is >475HV, and the core hardness is 300HV-450HV.

[0030] The inner surface 6 of the end ring where the cage 2 contacts the needle roller 3, both ends of the side beam 11, and the surface of the locking edge 14 are provided with a silver plating layer. In this embodiment, the cage 2 has a hard and wear-resistant surface, a strong and tough core, and a silver plating layer that reduces friction and conducts heat, making it particularly suitable for high-speed, high-temperature, and heavy-load needle roller bearing cage conditions.

[0031] The needle roller 3 is subjected to quenching and low-temperature tempering treatment, and the hardness of the needle roller 3 is 60-66HRC.

[0032] The high-temperature, high-speed, heavy-duty reinforced cage needle roller bearing described in this embodiment operates as follows: After the bearing is installed, the outer ring surface 4 is fixed to the housing, and the shaft passes through the central area of ​​the needle roller 3. Initially, the bearing is filled with lubricating oil, and a certain amount of lubricating oil is stored in the side oil groove 10 on the inner surface 6 of the end ring of the cage 2 and the central oil groove 16 at the locking edge 14 of the center beam 12. When the bearing operates under high temperature and high speed conditions, the lubricating oil gradually decreases due to heat evaporation, and the oil film tends to be interrupted.

[0033] At this time, the lubricating oil stored in the side oil groove 10 slowly seeps out, continuously replenishing the contact friction area between the needle roller end 8 and the inner surface 6 of the end ring; at the same time, the lubricating oil in the middle oil groove 16 seeps out to the contact area between the needle roller working surface 7 and the locking edge 14 and the two ends of the side beam 11. This dual oil replenishment mechanism effectively maintains oil film isolation and significantly reduces frictional heat generation and local temperature rise.

[0034] At high speeds, the strong centrifugal force can cause the needle roller 3 to tend to shift outwards from the pocket 13. However, the locking points 15 on the outer corners of the locking edge 14 are in close contact with the working surface 7 of the needle roller, forming a mechanical constraint that firmly confines the needle roller 3 within the pocket 13, preventing axial or radial shift and ensuring that the needle roller 3 always stays on the correct rolling trajectory. In addition, the inner surface 6 of the end ring 2 that contacts the needle roller 3, both ends of the side beam 11, and the surface of the locking edge 14 are plated with silver. The good thermal conductivity and low coefficient of friction of silver further promote heat dissipation and reduce sliding friction resistance.

[0035] Therefore, the present invention adopts the above-mentioned high-temperature, high-speed, heavy-duty reinforced cage needle roller bearing. By setting side oil grooves and middle oil grooves on the cage to store lubricating oil, when the lubricating oil is consumed due to high temperature evaporation, the reserve lubricating oil in the oil grooves can seep out in time to continuously replenish lubrication to the contact area between the needle rollers and the cage, reducing friction and temperature rise. At the same time, the locking point structure on the cage restricts the needle rollers in the pocket, effectively preventing the needle rollers from deviating under the strong centrifugal force generated by high speed, ensuring smooth and efficient operation of the bearing.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high-temperature high-speed heavy-load reinforced retainer needle bearing, characterized by: The device includes an outer ring, within which a retainer is provided. The retainer includes two retaining end rings, with a pocket beam between the two retaining end rings. Adjacent pocket beams have pockets, and needle rollers are provided in the pockets. Each retaining end ring includes an inner surface, and an edge oil groove is provided on the inner surface of the end ring located at the pocket position. The pocket beam includes an edge beam and a middle beam, with locking edges and a middle oil groove provided on both sides of the middle beam. Locking points are provided on the outer corners of the locking edges.

2. The high-temperature high-speed heavy-load reinforced retainer needle bearing according to claim 1, characterized in that: The outer ring includes an inner ring surface and an outer ring surface, and the needle roller includes a needle roller working surface and a needle roller end. The inner ring surface of the outer ring is in contact with the needle roller working surface.

3. The high-temperature high-speed heavy-load reinforced retainer needle bearing according to claim 2, characterized in that: The end of the needle roller is in contact with the inner surface of the end ring at the position of the side oil groove, and the working surface of the needle roller contacts the locking point.

4. The high-temperature high-speed heavy-load reinforced retainer needle bearing of claim 2, wherein: Both ends of the side beam contact the working surface of the needle roller.

5. The high-temperature high-speed heavy-load reinforced retainer needle bearing of claim 1, wherein: The two retaining end rings are connected by a plurality of pocket beams, the inner surface of the retaining end rings is connected to the side beams, and the two ends of the middle beam are connected to the side beams.

6. The high-temperature high-speed heavy-load reinforced retainer needle bearing of claim 5, wherein: The retaining end ring has a circular structure, and the pocket beams are arranged in a circular array along the retaining end ring.

7. The high-temperature high-speed heavy-load reinforced retainer needle bearing of claim 1, wherein: The oil groove is formed on the locking edge.

8. The high-temperature high-speed heavy-load reinforced retainer needle bearing of claim 1, wherein: The side beam has an outer peripheral surface facing the outer ring, the outer peripheral surface of the side beam is flush with the outer peripheral cylindrical surface of the retaining end ring, and the outer peripheral surface of the middle beam is located radially inside the outer peripheral surface of the side beam.

9. The high-temperature high-speed heavy-load reinforced retainer needle bearing of claim 1, wherein: The cage is made of low-carbon alloy steel. The entire cage is treated with carbonitriding, quenching, and low-temperature tempering. The inner surface of the end ring that contacts the needle roller, the two ends of the side beam, and the surface of the locking edge are provided with a silver plating layer.

10. The high-temperature high-speed heavy-load reinforced retainer needle bearing of claim 1, wherein: The needle rollers are subjected to quenching and low-temperature tempering treatment, and the hardness of the needle rollers is 60-66 HRC.

Images