Rolling bearing wrapped with graphite

Abstract

This utility model relates to the field of rolling bearing technology and discloses a rolling bearing with a cage encased in graphite. The bearing includes a rolling bearing body, comprising an outer ring and an inner ring. A cage is fixedly disposed outside the inner ring, and multiple rolling elements are rotatably disposed outside the cage. The outer surface of the cage is encased in graphite through molding. In this utility model, the graphite layer molded onto the outer surface of the cage provides a solid lubrication effect to the bearing body, eliminating the need for subsequent addition of lubricating oil or grease, reducing maintenance costs and downtime risks. Furthermore, the graphite continuously releases and forms a lubricating film during operation. Graphite has stable chemical properties and an extremely low coefficient of friction, effectively suppressing friction and wear between the rolling elements and the cage, and between the rolling elements and the outer ring, thus effectively improving the overall service life of the bearing.

Description

Technical Field

[0001] This utility model relates to the field of rolling bearing technology, and in particular to rolling bearings with a retainer encased in graphite. Background Technology

[0002] Bearings are an important component in modern mechanical equipment. Their main function is to support rotating mechanical bodies, reduce the coefficient of friction during their movement, and ensure their rotational accuracy. Rolling bearings are precision mechanical components that convert the sliding friction between the rotating shaft and the bearing housing into rolling friction, thereby reducing friction loss. They support the rotating shaft and the parts on the shaft, and maintain the normal working position and rotational accuracy of the shaft. Rolling bearings are easy to use and maintain, reliable in operation, and have a high load-bearing capacity at medium speeds.

[0003] Most existing rolling bearings rely on external lubrication methods, requiring regular replenishment of grease or oil during operation to maintain their normal performance. However, in many practical applications, there is a problem that grease or oil cannot be replenished frequently. This results in the bearing losing its lubricating medium due to untimely or incomplete lubrication, and the metal contact surface losing its oil film protection. Consequently, the bearing's operating resistance increases, energy consumption rises, and it can even cause difficulties in starting and stopping the equipment. Moreover, the metal surface lacking lubrication will wear out rapidly, which can lead to bearing jamming and abnormal noise in severe cases, thus significantly shortening the overall service life of the bearing. Bearing failure may also cause overall equipment failure, resulting in production downtime and losses.

[0004] Therefore, those skilled in the art have provided rolling bearings with a retainer encased in graphite to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a rolling bearing with a cage encased in graphite. By molding a graphite layer onto the outer surface of the cage, the bearing body achieves a solid lubrication effect, eliminating the need for subsequent addition of lubricating oil or grease, thus reducing maintenance costs and downtime risks. Furthermore, the graphite continuously releases and forms a lubricating film during operation. Graphite has stable chemical properties and an extremely low coefficient of friction, which effectively inhibits friction and wear between the rolling elements and the cage, and between the rolling elements and the outer ring, thereby effectively improving the overall service life of the bearing.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A rolling bearing with a retainer encased in graphite includes a rolling bearing body, the rolling bearing body including an outer ring and an inner ring, a retainer fixedly disposed outside the inner ring, a plurality of rolling elements rotatably disposed outside the retainer, and graphite being molded and encased on the outer surface of the retainer.

[0008] Furthermore, the outer ring has a groove inside, and the outer surfaces of the multiple rolling elements are all disposed inside the groove.

[0009] Furthermore, the cage is externally rotatably disposed inside the outer ring.

[0010] Furthermore, the outer ring and the inner ring are coaxial.

[0011] Furthermore, the multiple rolling elements are arranged in a ring shape.

[0012] Furthermore, all of the rolling elements are made of stainless steel.

[0013] This utility model has the following beneficial effects:

[0014] This invention proposes a rolling bearing with a cage encapsulated in graphite. The graphite is molded onto the outer surface of the cage. When the bearing body rotates, the rolling elements roll in the grooves on the inner wall of the outer ring, simultaneously contacting and sliding against the cage. As a result, the graphite layer on the cage surface gradually releases graphite particles. These particles are carried by the movement of the rolling elements into the spaces between the rolling elements and the outer ring grooves, as well as between the rolling elements and the cage. Under friction and pressure, these particles spread evenly, forming a solid lubricating film. This effectively reduces direct contact between metal surfaces, lowers the coefficient of friction, and enhances the flexibility of the rolling elements. Furthermore, the bearing achieves a self-lubricating function that allows for long-term stable operation without external oil supply, reducing subsequent maintenance costs and extending the bearing's service life. Attached Figure Description

[0015] Figure 1 This is an isometric view of the present invention near the outer ring;

[0016] Figure 2 This is an isometric schematic diagram of the entire utility model;

[0017] Figure 3 This is an isometric view of the present invention near the rolling element;

[0018] Figure 4 This is a front view schematic diagram of the present invention near the inner ring.

[0019] Legend:

[0020] 1. Rolling bearing body; 101. Outer ring; 102. Cage; 103. Inner ring; 104. Rolling elements. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figures 1-4 One embodiment provided by this utility model:

[0023] A rolling bearing with a retainer encased in graphite includes a rolling bearing body 1. The rolling bearing body 1 includes an outer ring 101 and an inner ring 103. A retainer 102 is fixedly disposed on the outside of the inner ring 103. Multiple rolling elements 104 are rotatably disposed on the outside of the retainer 102. Graphite is encased on the outer surface of the retainer 102 by molding.

[0024] The outer ring 101 has a groove inside, and multiple rolling elements 104 are all externally disposed inside the groove. The cage 102 is externally rotatably disposed inside the outer ring 101. The outer ring 101 and the inner ring 103 are coaxial. The multiple rolling elements 104 are arranged in a ring. All multiple rolling elements 104 are made of stainless steel.

[0025] Specifically, when the rolling bearing body 1 is connected to an external device, the inner ring 103 will rotate synchronously with the main shaft of the device. Since the inner ring 103 and the cage 102 are fixedly connected, the rotation of the inner ring 103 will directly drive the cage 102 to rotate synchronously. The rolling element 104 outside the cage 102 contacts the groove inside the outer ring 101. Under the drive of the cage 102 and the guidance of the groove of the outer ring 101, the rolling element 104 will rotate and move in a circle around its center with the cage 102. This rolling friction replaces the sliding friction, thereby reducing the resistance when the bearing body is running.

[0026] The outer surface of the cage 102 is coated with graphite by a molding process. The graphite coating process is a mature and publicly available technology. Therefore, its specific structure and working principle will not be described in detail here. When the rolling element 104 rolls along the groove between the cage 102 and the outer ring 101, its outer surface will continuously contact the graphite layer on the cage 102. The pressure and friction generated by the rolling will cause very fine wear on the graphite surface. The amount of wear is much lower than that of traditional metal friction. At the same time, graphite powder is formed. The graphite powder generated by the wear will be transferred between the contact interfaces between the rolling element 104 and the cage 102, and between the rolling element 104 and the groove of the outer ring 101, and gradually form a lubricating film on the contact surface.

[0027] As the bearing continues to operate, the graphite layer will continuously replenish graphite powder through micro-wear, maintaining the integrity of the lubricating film. The graphite release rate is adapted to the bearing operating parameters. At the same time, the cage 102 rotates synchronously with the inner ring 103, ensuring that the contact between the graphite layer and the rolling element 104 is always uniform, avoiding local lubrication loss. Even if the graphite layer loses a certain thickness due to long-term use, as long as it is not completely worn through, it can still achieve effective lubrication through the continuous transfer of graphite particles to the contact surfaces between the rolling element 104 and the outer ring 101, and between the rolling element 104 and the cage 102.

[0028] The outer ring 101 groove restricts the radial displacement of the rolling element 104 through its two side walls, preventing the rolling element 104 from leaving the bearing area and providing a stable rolling track for the rolling element 104. The cage 102 is provided with a rolling element 104 mounting groove, which is used to accommodate the rolling element 104 and restrict the displacement of the rolling element 104, ensuring that all rolling elements 104 are evenly distributed in a ring, sharing the load transmitted by the equipment and avoiding component damage caused by local overload. The inner ring 103 is fixed to the cage 102 with an interference fit, ensuring that the inner ring 103 can drive the cage 102 to rotate synchronously when it rotates, avoiding additional wear caused by relative sliding between the two. The outer ring 101 is provided with an arc-shaped cross-section groove, ensuring that the rolling element 104 rolls smoothly in the groove, while avoiding radial movement caused by excessive clearance.

[0029] Graphite itself has an extremely low coefficient of friction. The graphite lubricating film formed during operation can effectively isolate the rolling element 104 from the metal contact between the cage 102 and the outer ring 101, thereby minimizing the rolling friction resistance during bearing operation. At the same time, the amount of micro-wear of graphite is extremely small, and the thickness of the molded graphite layer can be designed according to requirements.

[0030] The rolling element 104 is made of stainless steel, which can withstand the radial load and impact load during bearing operation. At the same time, it has good corrosion resistance, which complements the corrosion resistance of graphite. Graphite has good corrosion resistance and does not require lubrication medium. It can be used in humid and dusty environments, avoiding bearing lubrication failure. The bearing adopts a modular structure. The graphite on the cage 102 is pre-wrapped by molding process, which eliminates the need to apply additional lubrication medium or install lubrication components during assembly. The assembly process is relatively simple. Moreover, there is no need for regular grease replenishment or oil change. Only the wear of the graphite layer needs to be checked periodically. When the graphite layer wears to the limit, only the cage 102 needs to be replaced.

[0031] It should be noted that the outer side of the roller of the rolling bearing, which is wrapped with graphite in the retainer of this utility model, is not covered with graphite material, thereby giving the roller better flexibility.

[0032] Working principle: The outer surface of the cage 102 is coated with graphite through a molding process. The molding process ensures that the graphite is firmly attached to the surface of the cage 102, forming a self-lubricating layer. When the bearing body is running, the rolling element 104 will roll in the groove inside the outer ring 101, and at the same time, it will contact the cage 102 and undergo sliding friction. During this process, the graphite layer on the surface of the cage 102 slowly releases fine graphite particles under the action of friction. These particles gradually attach to the groove between the rolling element 104 and the outer ring 101, as well as the friction contact surface between the rolling element 104 and the cage 102, forming a uniform and stable solid lubricating film. The formed lubricating film effectively reduces the coefficient of friction between the metal contact surfaces, reduces wear, and achieves a self-lubricating function that can operate stably for a long time without external lubrication. Furthermore, the chemical stability and lubrication continuity of graphite ensure the reliable operation of the rolling bearing body 1.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., 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. Rolling bearing wrapped in graphite, comprising a rolling bearing body (1), characterized in that: The rolling bearing body (1) includes an outer ring (101) and an inner ring (103). A cage (102) is fixedly provided on the outside of the inner ring (103). Multiple rolling elements (104) are rotatably provided on the outside of the cage (102). Graphite is provided on the outer surface of the cage (102) by molding.

2. The retainer-wrapped rolling bearing according to claim 1, characterized in that: The outer ring (101) has a groove inside, and the outer surfaces of the multiple rolling elements (104) are all disposed inside the groove.

3. The retainer-wrapped rolling bearing according to claim 1, characterized in that: The cage (102) is externally rotatably disposed inside the outer ring (101).

4. The retainer-wrapped rolling bearing according to claim 1, characterized in that: The outer ring (101) and the inner ring (103) are coaxial.

5. The retainer-wrapped rolling bearing according to claim 1, characterized in that: The multiple rolling elements (104) are arranged in a ring.

6. The rolling bearing with a graphite-encased retainer according to claim 1, characterized in that: All of the rolling elements (104) are made of stainless steel.

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