Self-lubricating powder metallurgical oil-impregnated bearing with micro-porous structure

Abstract

This utility model relates to a self-lubricating microporous powder metallurgy oil-impregnated bearing, comprising an outer bearing ring and a copper porous inner bearing ring. A self-lubricating mechanism is movably mounted on the outer ring. An annular groove is provided on the outer ring, and a rubber ring is engaged inside the groove. A lubrication cavity is provided inside the rubber ring, containing a hot-melt lubricant. A copper heat-conducting plate is fixedly mounted on the inner side of the rubber ring, and a connecting pipe is fixedly mounted thereon. A connecting hole is formed on the outer surface of the outer ring. This self-lubricating microporous powder metallurgy oil-impregnated bearing stores hot-melt lubricant in its lubrication cavity, forming an additional oil storage space, compensating for the limited oil storage capacity of the micropores in the copper porous inner ring. When the bearing's working oil is depleted, the hot-melt lubricant can be continuously replenished to the friction surface through the connecting pipe and connecting hole, eliminating the need for manual oiling and avoiding dry friction wear.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy bearing technology, specifically to a powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure. Background Technology

[0002] The self-lubricating performance of powder metallurgy oil-impregnated bearings relies on the microporous oil storage inside the bushing matrix. During operation, the lubricating oil seeps out to the friction surface through thermal expansion and centrifugal force. However, in the existing technology, the lubrication of the bearing depends entirely on the oil storage of the bushing itself, which has two major problems: First, the oil storage capacity is limited by the volume of the bushing, and long-term operation can easily lead to dry friction wear caused by oil depletion. Second, the lubricating oil seepage rate is uncontrollable, and it is easy to lose oil quickly under high temperature or vibration conditions, and it is impossible to replenish lubrication according to the actual wear condition.

[0003] To address the aforementioned issues, some technologies employ periodic manual oiling, but this requires machine downtime, impacting production efficiency. Other technologies utilize self-lubricating mechanisms to achieve active lubrication for powder metallurgy oil-impregnated bearings, such as the self-lubricating bearing disclosed in utility model patent CN220168371U. This utility model's self-lubricating bearing features a cover plate that shields the oil injection hole, preventing dust from entering and facilitating the installation and removal of the cover plate and outer ring. Multiple sealing elements—a third, second, and first sealing gasket—provide a superior sealing effect and enhance its future application prospects.

[0004] However, in order to achieve self-lubrication, the aforementioned utility model patent requires an additional lubricating oil supply pump and oil injection connector. This significantly increases the size and weight of the equipment due to the oil supply pump and pipeline system, making it difficult to fit into narrow installation spaces. Secondly, the oil supply pump requires an external power source or mechanical power source, which not only increases energy consumption but also increases the number of failure points, such as oil pump stalling and pipeline blockage. Therefore, a self-lubricating microporous structure powder metallurgy oil-impregnated bearing is proposed to solve the above problems. Utility Model Content

[0005] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure. It has the advantages of additional oil storage, dynamic temperature-dependent seepage adjustment, and no need for external power or oil replenishment during downtime, which can effectively solve the problems in the background technology.

[0006] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure, comprising an outer bearing ring and a copper porous inner bearing ring, wherein a self-lubricating mechanism is movably mounted on the outer bearing ring. The self-lubricating mechanism includes an annular groove, a rubber ring, a lubrication cavity, a hot-melt lubricant, a copper heat-conducting plate, a connecting pipe, and a connecting hole. The outer ring of the bearing has an annular groove on its exterior, and a rubber ring is engaged inside the annular groove. The rubber ring has a lubrication cavity inside, and a hot-melt lubricant is placed inside the lubrication cavity. A copper heat-conducting plate is fixedly installed on the inner side of the rubber ring, and a connecting pipe is fixedly installed on the inner side of the rubber ring. A connecting hole is formed on the outer surface of the bearing outer ring.

[0007] Furthermore, there are two copper heat-conducting plates, which are respectively fixedly installed on the inner left and inner right walls of the rubber ring, and the depth of the annular groove is the same as the width of the rubber ring.

[0008] Furthermore, one side of the copper heat-conducting plate is in contact with the hot-melt lubricant inside the lubrication cavity, and the other side is in contact with the outer surface of the bearing outer ring.

[0009] Furthermore, there are two connecting holes, located on the top and bottom outer surfaces of the bearing outer ring, respectively, and both connecting holes extend from the outer surface of the bearing outer ring to the inner side of the bearing outer ring.

[0010] Furthermore, there are two connecting tubes, one end of which extends into the interior of the lubrication cavity, and the other end of which passes through two connecting holes respectively.

[0011] Furthermore, the outer surface of the connecting pipe is interference-fitted with the inner wall of the connecting hole, and an elastic sealing ring is fitted on the section of the connecting pipe located inside the connecting hole; a uniformly distributed heat-conducting groove is provided on the side of the copper heat-conducting plate that is in contact with the outer surface of the bearing outer ring.

[0012] (III) Beneficial Effects Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. The powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure has a rubber ring that is snapped onto the outside of the bearing outer ring through an annular groove. The internal lubrication cavity stores hot melt lubricant, forming an additional oil storage space, which makes up for the limited oil storage capacity of the micropores in the inner ring of the copper porous bearing. When the bearing working oil is exhausted, the hot melt lubricant can be continuously replenished to the friction surface through the connecting pipe and connecting hole, without the need for manual oiling after machine shutdown, thus avoiding dry friction wear.

[0013] 2. This powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure has a copper heat-conducting plate attached to the outer surface of the bearing ring and in contact with the hot-melt lubricant, which can quickly conduct the working heat of the bearing. When the temperature rises or the vibration intensifies, the hot-melt lubricant melts faster and seeps out as needed through the connecting pipe. When the temperature is stable, the seepage slows down, realizing dynamic seepage adjustment. This solves the problem of uncontrollable lubricant seepage rate and easy rapid loss, and does not require an external power source, reducing the number of failure points.

[0014] 3. The powder metallurgy oil-impregnated bearing with this self-lubricating microporous structure has an elastic rubber ring that engages with the outer ring of the bearing via an annular groove. When the hot melt lubricant in the lubrication cavity is depleted, the rubber ring can easily disengage from the annular groove due to its elastic deformation, simultaneously pulling the connecting tube out of the connecting hole. The rubber ring can be quickly disassembled and a new self-lubricating mechanism can be replaced without complicated tools to replenish the lubricant, solving the problem of cumbersome disassembly of traditional oil replenishment structures and improving oil replenishment efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the powder metallurgy oil-impregnated bearing structure of this utility model; Figure 2 This is a schematic diagram of the inner ring structure of the copper porous bearing of this utility model; Figure 3 This is a schematic diagram of the self-lubricating mechanism of this utility model; Figure 4 This is a side view of the bearing outer ring structure of this utility model; Figure 5 This is a schematic diagram of the cross-section of the rubber ring of this utility model.

[0016] In the diagram: 1. Bearing outer ring; 2. Copper porous bearing inner ring; 3. Self-lubricating mechanism; 301. Annular groove; 302. Rubber ring; 303. Lubrication cavity; 304. Hot melt lubricant; 305. Copper heat-conducting plate; 306. Connecting pipe; 307. Connecting hole. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1-5 In this embodiment, a powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure includes an outer bearing ring 1 and a copper porous bearing inner ring 2. A self-lubricating mechanism 3 is movably mounted on the outside of the outer bearing ring 1. The self-lubricating mechanism 3 includes an annular groove 301, a rubber ring 302, a lubrication cavity 303, a hot melt lubricant 304, a copper heat-conducting plate 305, a connecting pipe 306, and a connecting hole 307. The annular groove 301 is provided on the outside of the bearing outer ring 1. The rubber ring 302 is engaged inside the annular groove 301. The lubrication cavity 303 is provided inside the rubber ring 302. The hot melt lubricant 304 is provided inside the lubrication cavity 303. The copper heat-conducting plate 305 is fixedly installed on the inner side of the rubber ring 302. The connecting pipe 306 is fixedly installed on the inner side of the rubber ring 302. The connecting hole 307 is opened on the outer surface of the bearing outer ring 1.

[0019] Specifically, the outer ring 1 of the bearing has a pre-set annular groove 301 that matches the width of the rubber ring 302. The rubber ring 302 is securely engaged with the outer ring 1 of the bearing through the annular groove 301. An independent lubrication cavity 303 is formed inside to store hot melt lubricant 304, which constitutes an additional oil storage unit to supplement the insufficient microporous oil storage of the inner ring 2 of the copper porous bearing. Two connecting pipes 306 fixed inside the rubber ring 302 extend one end into the lubrication cavity 303, and the other end passes through two connecting holes 307 at the top and bottom of the outer ring 1 of the bearing, respectively. The connecting pipes 306 and the inner walls of the connecting holes 307 are press-fitted. At the same time, an elastic sealing ring is fitted on the section of the connecting pipes 306 inside the connecting holes 307 to ensure sealing performance. When the lubricating oil in the micropores of the inner ring 2 of the copper porous bearing is exhausted, the hot melt lubricant 304 in the lubrication cavity 303 can be continuously delivered to the friction surface through the connecting pipes 306 and the connecting holes 307 to achieve uninterrupted lubrication. Specifically, a copper heat-conducting plate 305 is fixedly installed on the inner left and inner right walls of the rubber ring 302. One side of the copper heat-conducting plate 305 is in direct contact with the hot melt lubricant 304 in the lubrication cavity 303, and the other side is tightly attached to the outer surface of the bearing outer ring 1. The contact surface is provided with uniformly distributed heat-conducting grooves to improve heat conduction efficiency. The heat generated during bearing operation is quickly transferred to the copper heat-conducting plate 305 through the outer ring 1 of the bearing, and then conducted to the hot melt lubricant 304. When the operating temperature rises or the vibration intensifies, the hot melt lubricant 304 melts faster and the seepage rate increases accordingly to meet the lubrication requirements under high load. When the temperature is stable, the melting rate of the hot melt lubricant 304 slows down and the seepage amount decreases accordingly, realizing the dynamic control of the lubricating oil seepage rate.

[0020] Specifically, the disassembly and replacement of the self-lubricating mechanism 3 is achieved through the elastic deformation of the rubber ring 302, without the need for complex tools; When the hot melt lubricant 304 in the lubrication cavity 303 is exhausted, an external force is applied to the rubber ring 302 to cause it to deform elastically, so that it can be disengaged from the annular groove 301 on the outer ring 1 of the bearing, and at the same time, the connecting pipe 306 is pulled out from the connecting hole 307. When replacing the new self-lubricating mechanism 3, align the rubber ring 302 with the annular groove 301 and press it tightly to ensure that the copper heat-conducting plate 305 is fully in contact with the outer surface of the bearing outer ring 1. The connecting pipe 306 should be accurately passed through the connecting hole 307 and kept sealed to complete the lubricant replenishment and restore the self-lubricating function.

[0021] Specifically, the hot melt lubricant 304, as the core lubricating medium of the self-lubricating mechanism 3, is sealed and stored in the lubrication cavity 303 inside the rubber ring 302. Its physical state and seepage behavior are fully adapted to the working conditions of the bearing. Under normal temperature or low load conditions, the hot melt lubricant 304 is solid or semi-solid and can be stably retained in the lubrication cavity 303 to avoid leakage and waste when not in operation. At the same time, it can continuously sense the temperature change transmitted by the outer ring 1 of the bearing through continuous contact with the copper heat-conducting plate 305 inside the rubber ring 302. When the bearing enters the working state, the heat generated by friction is conducted through the outer ring 1 of the bearing to the copper heat-conducting plate 305, and then quickly transferred to the hot melt lubricant 304, causing it to gradually melt into a liquid state as the temperature rises. At this time, the liquid hot melt lubricant 304, with its own fluidity, slowly penetrates into the connecting hole 307 of the outer ring 1 of the bearing through the connecting pipe 306 extending to the lubrication cavity 303, and finally replenishes the friction surface between the inner ring 2 of the copper porous bearing and the shaft, filling the lubrication gap after the microporous oil storage is exhausted.

[0022] In addition, the melting temperature and exudation rate of hot melt lubricant 304 are adapted to precisely match the common operating temperature range of bearings. This ensures sufficient lubrication and prevents dry friction under high temperature and high load conditions, while avoiding lubricant waste due to excessive exudation under low temperature and low load conditions, thereby further improving the overall lubrication stability and service life of the bearing.

[0023] In summary, in this powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure, the rubber ring 302 is snapped onto the outside of the bearing outer ring 1 via an annular groove 301. The internal lubrication cavity 303 stores hot-melt lubricant 304, forming an additional oil storage space, which compensates for the limited oil storage capacity of the micropores in the inner ring 2 of the copper porous bearing. When the bearing working oil is exhausted, the hot-melt lubricant 304 can be continuously replenished to the friction surface through the connecting pipe 306 and the connecting hole 307, eliminating the need for manual oiling and avoiding dry friction wear.

[0024] Furthermore, in this powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure, the copper heat-conducting plate 305 is attached to the outer surface of the bearing outer ring 1 and in contact with the hot melt lubricant 304, which can quickly conduct the working heat of the bearing. When the temperature rises or the vibration intensifies, the hot melt lubricant 304 melts faster and seeps out as needed through the connecting pipe 306. When the temperature is stable, the seepage slows down, realizing dynamic seepage adjustment. This solves the problem of uncontrollable lubricating oil seepage rate and easy rapid loss, and no external power source is required, reducing the number of failure points.

[0025] Furthermore, in this powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure, the rubber ring 302 is elastic and is engaged with the outer ring 1 of the bearing through an annular groove 301. When the hot melt lubricant 304 in the lubrication cavity 303 is exhausted, it can easily disengage from the annular groove 301 by means of the elastic deformation of the rubber ring 302, and at the same time drive the connecting tube 306 to be pulled out from the connecting hole 307. The rubber ring 302 can be quickly disassembled and a new self-lubricating mechanism 3 can be replaced without complicated tools to replenish the lubricant, which solves the problem of cumbersome disassembly of traditional oil replenishment structures and improves the oil replenishment efficiency.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A powder metallurgy oil-impregnated bearing with a self-lubricating microporous structure, comprising an outer bearing ring (1) and a copper porous inner bearing ring (2), characterized in that: The outer ring (1) of the bearing is externally mounted with a self-lubricating mechanism (3); The self-lubricating mechanism (3) includes an annular groove (301), a rubber ring (302), a lubrication cavity (303), a hot melt lubricant (304), a copper heat-conducting plate (305), a connecting pipe (306), and a connecting hole (307). The outer ring (1) of the bearing is provided with an annular groove (301). The annular groove (302) is engaged with the rubber ring (302). The rubber ring (302) is provided with a lubrication cavity (303). The lubrication cavity (303) is provided with a hot melt lubricant (304). The inner side of the rubber ring (302) is fixedly installed with a copper heat-conducting plate (305). The inner side of the rubber ring (302) is fixedly installed with a connecting pipe (306). The outer surface of the outer ring (1) of the bearing is provided with a connecting hole (307).

2. A powder metallurgy self-lubricating porous structured bearing according to claim 1, characterized in that: There are two copper heat-conducting plates (305), which are fixedly installed on the inner left and inner right walls of the rubber ring (302) respectively. The depth of the annular groove (301) is the same as the width of the rubber ring (302).

3. A powder metallurgy self-lubricating porous structured oil-impregnated bearing according to claim 1, characterized in that: One side of the copper heat-conducting plate (305) is in contact with the hot melt lubricant (304) inside the lubrication cavity (303), and the other side is in contact with the outer surface of the bearing outer ring (1).

4. A powder metallurgy self-lubricating porous structured oil-impregnated bearing according to claim 1, characterized in that: There are two connecting holes (307), which are located on the top outer surface and bottom outer surface of the bearing outer ring (1), respectively. Both connecting holes (307) extend from the outer surface of the bearing outer ring (1) to the inner side of the bearing outer ring (1).

5. A powder metallurgy self-lubricating porous structured oil-impregnated bearing according to claim 1, characterized in that: There are two connecting tubes (306), one end of which extends into the interior of the lubrication cavity (303), and the other end of which passes through two connecting holes (307) respectively.

6. A powder metallurgy self-lubricating porous structured bearing according to claim 1, wherein: The outer surface of the connecting pipe (306) and the inner wall of the connecting hole (307) are interference fit, and the section of the connecting pipe (306) located inside the connecting hole (307) is fitted with an elastic sealing ring; the copper heat-conducting plate (305) is provided with uniformly distributed heat-conducting grooves on the side that is in contact with the outer surface of the bearing outer ring (1).

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