A sliding bearing with replaceable inner liner

Abstract

This utility model discloses a replaceable inner liner sliding bearing, including a bearing housing, a bearing sleeve, an inner liner, and a pressure indicator assembly. The bearing sleeve is fixed to the bearing housing, and the inner liner is nested inside the bearing sleeve and slides with a guide shaft. The outer wall of the inner liner has an circumferential groove and an axial groove, forming a sealed cavity filled with high-pressure gas. The pressure indicator assembly includes a piston seat, an indicator rod, and a support spring. The indicator rod is driven to extend and retract by changes in air pressure to monitor the wear status of the inner liner in real time. When the inner liner wears to a critical value, the sealed cavity loses pressure, and the indicator rod retracts to indicate replacement. This utility model integrates wear warning and modular quick-release, and has the advantages of convenient maintenance, efficient lubrication, and long service life. It is suitable for precision machinery, automated equipment, and heavy-duty transmission fields.

Description

Technical Field

[0001] This utility model relates to the field of sliding bearing technology, specifically a sliding bearing with replaceable inner liner. Background Technology

[0002] As a key component in mechanical transmission systems, sliding bearings are widely used in guiding and supporting various linear or rotary motion applications. Traditional sliding bearings typically consist of a bearing housing and a wear-resistant inner liner, transmitting motion through a sliding fit with a guide shaft or journal. However, during long-term operation, frictional wear between the inner liner and moving parts is inevitable. Once the wear exceeds the allowable range, it will lead to decreased bearing precision, increased vibration, or even failure, severely affecting the operational stability and lifespan of the equipment.

[0003] Currently, most common sliding bearing liners are integral structures, requiring complete replacement after wear, resulting in high maintenance costs and cumbersome operations. Although some improvement solutions employ removable liner designs, they lack effective wear monitoring methods and often rely on periodic disassembly and inspection or experience-based judgment, making it difficult to detect liner wear in a timely manner and easily leading to delayed or premature replacement. Utility Model Content

[0004] In view of the above-mentioned shortcomings in the existing technology, the purpose of this utility model is to provide a sliding bearing with a replaceable inner liner, which realizes wear warning, convenient maintenance, and efficient lubrication, significantly improving the service life and operational reliability of the bearing, and is suitable for high-end industrial fields such as precision machinery, automated equipment, and heavy-duty transmission.

[0005] The technical solution adopted by this utility model to achieve the above objectives is: a sliding bearing with a replaceable inner liner, comprising:

[0006] A bearing housing, on which a bearing sleeve is fixedly connected, and the bearing sleeve is fitted with a guide shaft that slides along an axis;

[0007] The inner bushing is nested and installed in the bearing sleeve. The guide shaft is slidably fitted with the inner wall of the inner bushing. The outer wall of the inner bushing is provided with evenly arranged circumferential grooves. The outer wall of the inner bushing is also provided with multiple sets of axial grooves that connect the circumferential grooves. The circumferential grooves and axial grooves form a sealing cavity, which is filled with high-pressure gas.

[0008] A pressure-indicating assembly is assembled onto the bearing sleeve and maintains communication with the sealed cavity. The pressure-indicating assembly includes a piston seat, an indicator rod, and a support spring connected to the piston seat. The two ends of the piston seat are respectively connected to the external environment and the sealed cavity, and the indicator rod is fixed to the outer end of the piston seat.

[0009] Based on the above technical solutions, in order to ensure that the inner bushing can be stably assembled in the bearing sleeve and can be easily replaced, while ensuring the airtightness of the formed sealing cavity, the following technical solutions are provided.

[0010] The bearing sleeve is provided with a positioning ring and a connecting flange at both ends. The positioning ring and the connecting flange are respectively arranged on the inner and outer sides of the bearing sleeve. The connecting flange is connected to the end cap by a bolt assembly. The two ends of the inner bushing are respectively in contact with the positioning ring and the end cap.

[0011] A sealing ring A is provided between the inner bushing and the positioning ring, a sealing ring B is provided between the inner bushing and the end cover, and a sealing ring C is provided between the end cover and the connecting flange.

[0012] Based on the above technical solutions, in order to ensure that the inner bushing can be stably inserted and slid with the guide shaft, and thus ensure the lubrication effect of the guide shaft and the inner bushing, the following technical solutions are provided.

[0013] The inner diameter of the inner liner is smaller than the inner diameter of the positioning ring and the end cap. The inner wall of the inner liner is provided with evenly distributed circumferential oil grooves, which are arranged alternately with the circumferential through grooves.

[0014] Based on the above technical solutions, in order to ensure that the pressure indicator assembly can be stably assembled on the bearing sleeve and achieve communication with the sealing cavity, and to ensure that the piston seat and indicator rod can operate under pressure difference, the following technical solutions are provided.

[0015] The bearing sleeve is provided with a connection port that communicates with the sealing cavity. The pressure indicator assembly also includes a connecting pipe, an assembly pipe, and an assembly cover. The connecting pipe is screwed into the connection port in a sealed manner. The assembly pipe is connected to the side wall of the connecting pipe. The piston seat is slidably installed in the assembly pipe. The assembly cover is screwed to the end of the assembly pipe. The indicator rod is slidably inserted into the assembly cover and extends to the outside of the assembly cover. The support spring is sleeved around the indicator rod and its two ends are respectively in contact with the assembly cover and the piston seat.

[0016] Based on the above technical solutions, in order to ensure the stable installation of the piston seat in the assembly tube, to ensure that the piston seat can be connected to the standard gas pressure of the external environment, and to facilitate the filling of the sealed cavity with high-pressure gas, the following technical solutions are provided.

[0017] The inner end of the assembly tube is provided with a limit ring, the piston seat is arranged outside the limit ring, the assembly cover is provided with a connecting hole, and the end of the connecting tube is equipped with a one-way valve.

[0018] The beneficial effects of this utility model are:

[0019] 1. Real-time wear monitoring enables precise and efficient maintenance. By creating a sealed cavity with circumferential and axial through grooves on the outer wall of the inner bushing and filling it with high-pressure gas, combined with a pressure indicator component, the wear status of the inner bushing can be monitored in real time. When the inner bushing wears to the critical thickness, the sealed cavity loses pressure due to damage, and the indicator rod automatically retracts, providing a clear indication to replace the inner bushing. This avoids the lag issues of traditional manual disassembly and inspection, improving maintenance accuracy.

[0020] 2. Modular and replaceable design, easy to disassemble and assemble. The inner liner adopts an independent nested structure and is fixed by the end cap and positioning ring. With the sealing ring, airtightness is ensured. The inner liner can be quickly replaced by simply removing the bolts. There is no need to adjust the bearing seat, which greatly reduces maintenance time and cost.

[0021] 3. Multiple sealing guarantees stable and reliable operation. The triple sealing design ensures that the sealing cavity does not leak during long-term operation, maintaining a stable gas pressure monitoring environment. The one-way valve design facilitates high-pressure gas filling and prevents gas backflow, ensuring long-term stable system pressure.

[0022] 4. Optimize the lubrication structure to reduce friction loss. The inner wall of the inner bushing is equipped with annular oil grooves to store grease or lubricating oil, forming a long-lasting lubricating film, further reducing the coefficient of friction and improving the bearing's load-bearing capacity and smoothness of movement. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model combined with the guide shaft;

[0024] Figure 2 This is a schematic diagram of the structure of the present invention in cross-section.

[0025] Figure 3 This is a schematic diagram of the inner liner.

[0026] Figure 4 This is a schematic diagram of the structure after the various components of the pressure-indicating assembly are assembled.

[0027] In the diagram: 11 Bearing housing, 111 Mounting through hole, 12 Bearing sleeve, 121 Positioning ring, 122 Connecting flange, 123 Connecting port, 125 Bolt assembly, 13 End cap, 141 Sealing ring A, 142 Sealing ring B, 143 Sealing ring C, 2 Inner bushing, 21 Circumferential through groove, 22 Axial through groove, 23 Circumferential oil groove, 3 Pressure indicator assembly, 31 Piston seat, 32 Indicator rod, 33 Support spring, 34 Connecting pipe, 35 Assembly pipe, 36 Assembly cover, 37 Limiting ring, 38 Connecting hole, 39 Check valve, 4 Guide shaft. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0029] Please see Figure 1-4 A sliding bearing with a replaceable liner, comprising:

[0030] Bearing housing 11, bearing sleeve 12 is fixedly connected to bearing housing 11, and bearing sleeve 12 is equipped with guide shaft 4 that slides along the axis.

[0031] The inner bushing 2 is nested in the bearing sleeve 12. The guide shaft 4 is slidably fitted with the inner wall of the inner bushing 2. The outer wall of the inner bushing 2 is provided with evenly arranged circumferential grooves 21. The outer wall of the inner bushing 2 is also provided with multiple sets of axial grooves 22 that connect the circumferential grooves 21. The circumferential grooves 21 and the axial grooves 22 form a sealing cavity, which is filled with high-pressure gas.

[0032] Pressure indicator assembly 3 is assembled onto bearing sleeve 12 and maintains communication with the sealing cavity. Pressure indicator assembly 3 includes piston seat 31, indicator rod 32 and support spring 33 connected to piston seat 31. Both ends of piston seat 31 are connected to the external environment and the sealing cavity, respectively. Indicator rod 32 is fixed to the outer end of piston seat 31.

[0033] The bearing housing 11 and the bearing sleeve 12 are integrally cast, and the ends and inner walls of the bearing sleeve 12 are machined to ensure a precise fit with the inner bushing 2. The bearing housing 11 is provided with a mounting through hole 111 to ensure that the bearing housing 11 is fixedly installed on the frame of the relevant equipment by bolts passing through the mounting through hole 111, and linear sliding is achieved with the cooperation of the inner bushing 2 and the guide shaft 4.

[0034] The inner bushing 2 is made of composite materials through processes such as die casting, sintering, electroplating, and spraying. The specific materials can be Babbitt alloy, copper-based alloy, or aluminum-based alloy as the matrix, combined with carbon-based materials and ceramic materials to reflect its structural strength and lubrication and wear resistance, so that the inner bushing 2 can cooperate with the guide shaft 4, thereby providing a stable guiding and lubrication effect for the guide shaft 4.

[0035] The guide shaft 4 and the inner bushing 2 are fitted with a clearance fit so that they can be assembled and slide relative to each other. During the long-term sliding operation of the guide shaft 4 and the inner bushing 2, wear between the guide shaft 4 and the inner bushing 2 is inevitable. After the inner bushing 2 is worn to a certain thickness, the material in the circumferential groove 21 will collapse and break beforehand, so that the high-pressure gas in the sealing cavity (usually stable nitrogen) will leak from the break to the inside of the inner bushing 2, causing the sealing cavity to lose pressure to the normal pressure state.

[0036] Under normal operating conditions of the sliding bearing, the high-pressure gas in the sealed cavity enables the piston seat 31 to overcome the resistance of the support spring 33 and slide outward, thereby causing the indicator rod 32 to be pushed out, indicating that the inner bushing 2 can be used normally.

[0037] After the sealing cavity loses pressure due to the damage of the inner liner 2, the air pressure in the sealing cavity returns to the normal level of the outside. At this time, the support spring 33 can push the piston seat 31 to move inward, thereby retracting the indicator rod 32 to indicate that the inner liner 2 needs to be replaced immediately.

[0038] To ensure that the inner bushing 2 can be stably assembled in the bearing sleeve 12 and can be easily replaced, while ensuring the airtightness of the formed sealing cavity, the following technical solution is provided.

[0039] The bearing sleeve 12 has a positioning ring 121 and a connecting flange 122 at both ends. The positioning ring 121 and the connecting flange 122 are respectively arranged on the inner and outer sides of the bearing sleeve 12. The connecting flange 122 is connected to the end cap 13 by bolt assembly 125. The two ends of the inner bushing 2 are in contact with the positioning ring 121 and the end cap 13 respectively.

[0040] A sealing ring A141 is provided between the inner bushing 2 and the positioning ring 121, a sealing ring B142 is provided between the inner bushing 2 and the end cover 13, and a sealing ring C143 is provided between the end cover 13 and the connecting flange 122.

[0041] The connection flange 122 ensures that the end cover 13 is stably installed on it, and facilitates disassembly and assembly for replacement of the inner bushing 2. At the same time, the positioning ring 121 and the end cover 13 enable precise positioning of the inner bushing 2.

[0042] The sealing rings A141, B142, and C143 are designed to fully seal the connections at both ends of the inner bushing, thereby ensuring the airtightness of the sealing cavity.

[0043] To ensure that the inner bushing 2 can be stably inserted and slid with the guide shaft 4, thereby ensuring the lubrication effect of the guide shaft 4 and the inner bushing 2, the following technical solution is provided.

[0044] The inner diameter of the inner bushing 2 is smaller than the inner diameter of the positioning ring 121 and the end cap 13. The inner wall of the inner bushing 2 is provided with evenly arranged circumferential oil grooves 23, and the circumferential oil grooves 23 and the circumferential through grooves 21 are arranged alternately.

[0045] By designing the inner diameter of the inner bushing 2 to be smaller than the inner diameter of the positioning ring 121 and the end cap 13, it is possible to ensure that the guide shaft 4 and the inner bushing 2 maintain a stable sliding connection and avoid spatial movement interference from the positioning ring 121 and the end cap 13.

[0046] The circumferential oil groove 23 can be filled with lubricating oil or grease so that it fills the gap between the guide shaft 4 and the inner bushing 2, thereby providing lubrication for the movement of the guide shaft 4 and the inner bushing 2.

[0047] To ensure that the pressure indicator assembly 3 can be stably assembled on the bearing sleeve 12 and communicate with the sealing cavity, and to ensure that the piston seat 31 and the indicator rod 32 can operate under pressure difference, the following technical solution is provided.

[0048] The bearing sleeve 12 is provided with a connection port 123 that communicates with the sealing cavity. The pressure indicator assembly 3 also includes a connecting pipe 34, an assembly pipe 35, and an assembly cover 36. The connecting pipe 34 is screwed into the connection port 123. The assembly pipe 35 is connected to the side wall of the connecting pipe 34. The piston seat 31 is slidably installed in the assembly pipe 35. The assembly cover 36 is screwed into the end of the assembly pipe 35. The indicator rod 32 is slidably inserted into the assembly cover 36 and extends to the outside of the assembly cover 36. The support spring 33 is sleeved around the indicator rod 32 and its two ends are respectively in contact with the assembly cover 36 and the piston seat 31.

[0049] The connection port 123 ensures that the connecting pipe 34 is stably installed on it. The connecting pipe 34 and the connection port 123 are connected by threads, and PTFE tape is wrapped around the thread groove to ensure the sealing effect of the connection position.

[0050] The assembly pipe 35 is connected to the connecting pipe 34, and the piston seat 31 can operate stably under the action of the air pressure difference at both ends and the action of the support spring 33, so as to control the extension and retraction posture of the indicator rod 32.

[0051] The assembly cover 36 is also screwed onto the end of the assembly tube 35. After the indicator rod 32, piston seat 31, and support spring 33 are assembled onto the assembly tube 35, the assembly cover 36 is then assembled to ensure the stable operation of the indicator rod 32, piston seat 31, and support spring 33.

[0052] To ensure the stable installation of the piston seat 31 in the assembly tube 35, to ensure that the piston seat 31 can be connected to the standard gas pressure of the external environment, and to facilitate the filling of the sealed cavity with high-pressure gas, the following technical solution is provided.

[0053] A limit ring 37 is provided on the inner end of the assembly tube 35, the piston seat 31 is arranged on the outer side of the limit ring 37, a connecting hole 38 is provided on the assembly cover 36, and a one-way valve 39 is installed at the end of the connecting tube 34.

[0054] The limiting ring 37 can limit the piston seat 31 to ensure that the piston seat 31 operates stably in the assembly tube 35. The connecting hole 38 on the assembly cover 36 can connect the outer end of the piston seat 31 to the atmospheric environment. The one-way valve 39 can ensure that high-pressure gas is injected into the sealing cavity from here, thereby preventing high-pressure gas leakage.

[0055] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sliding bearing with a replaceable inner liner, characterized in that, include: A bearing housing (11) is fixedly connected to a bearing sleeve (12), and the bearing sleeve (12) is equipped with a guide shaft (4) that slides along the axis. The inner bushing (2) is nested in the bearing sleeve (12). The guide shaft (4) is slidably fitted with the inner wall of the inner bushing (2). The outer wall of the inner bushing (2) is provided with evenly arranged circumferential grooves (21). The outer wall of the inner bushing (2) is also provided with multiple sets of axial grooves (22) that connect the circumferential grooves (21). The circumferential grooves (21) and the axial grooves (22) form a sealing cavity, which is filled with high-pressure gas. The pressure indicator assembly (3) is assembled onto the bearing sleeve (12) and maintains communication with the sealing cavity. The pressure indicator assembly (3) includes a piston seat (31), an indicator rod (32), and a support spring (33) connected to the piston seat (31). The two ends of the piston seat (31) are respectively connected to the external environment and the sealing cavity. The indicator rod (32) is fixed to the outer end of the piston seat (31).

2. The sliding bearing with a replaceable inner liner according to claim 1, characterized in that: The bearing sleeve (12) is provided with a positioning ring (121) and a connecting flange (122) at both ends. The positioning ring (121) and the connecting flange (122) are respectively arranged on the inner and outer sides of the bearing sleeve (12). The connecting flange (122) is connected to an end cap (13) by a bolt assembly (125). The two ends of the inner bushing (2) are respectively in contact with the positioning ring (121) and the end cap (13). A sealing ring A (141) is provided between the inner bushing (2) and the positioning ring (121), a sealing ring B (142) is provided between the inner bushing (2) and the end cap (13), and a sealing ring C (143) is provided between the end cap (13) and the connecting flange (122).

3. A sliding bearing with a replaceable inner liner according to claim 2, characterized in that: The inner diameter of the inner bushing (2) is smaller than the inner diameter of the positioning ring (121) and the end cap (13). The inner wall of the inner bushing (2) is provided with evenly arranged circumferential oil grooves (23), and the circumferential oil grooves (23) and the circumferential through grooves (21) are arranged alternately.

4. A sliding bearing with a replaceable inner liner according to claim 1, characterized in that: The bearing sleeve (12) is provided with a connection port (123) that communicates with the sealing cavity. The pressure indicator assembly (3) also includes a connecting pipe (34), an assembly pipe (35), and an assembly cover (36). The connecting pipe (34) is screwed into the connection port (123) in a sealed manner. The assembly pipe (35) is connected to the side wall of the connecting pipe (34). The piston seat (31) is slidably installed in the assembly pipe (35). The assembly cover (36) is screwed into the end of the assembly pipe (35). The indicator rod (32) is slidably inserted into the assembly cover (36) and extends to the outside of the assembly cover (36). The support spring (33) is sleeved around the indicator rod (32) and its two ends are respectively in contact with the assembly cover (36) and the piston seat (31).

5. A sliding bearing with a replaceable inner liner according to claim 4, characterized in that: The inner end of the assembly tube (35) is provided with a limiting ring (37), the piston seat (31) is arranged on the outside of the limiting ring (37), the assembly cover (36) is provided with a connecting hole (38), and the end of the connecting tube (34) is equipped with a one-way valve (39).

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