A magnetic composite water-lubricated rubber bearing with impact resistance

Abstract

The present invention discloses a magnetic composite water-lubricated rubber bearing with impact resistance, which solves the problems of poor impact resistance and the need to further improve the sealing performance of the existing magnetic composite water-lubricated rubber bearings. The technical solution includes a bearing metal bushing and a bearing unit sleeved in the bearing metal bushing, wherein the bearing unit is composed of an upper magnet unit assembly and a lower water-lubricated rubber half-bearing, which are spliced ​​into a complete cylinder; the magnet unit assembly includes a magnet unit and a bearing protection assembly located at both ends of the magnet unit, and the end face of the bearing protection assembly is flush with the bearing metal bushing; the inner wall of the magnet unit and the space between the magnet unit and the water-lubricated rubber half-bearing are sealed in an integrated manner with a rubber sealing sheet. The present invention has a simple structure, is easy to manufacture and maintain, has a long service life, and takes both sealing and impact resistance into consideration.

Description

Technical Field

[0001] The invention relates to the technical field of bearing design, in particular to a magnetic composite water-lubricated rubber bearing. Background Art

[0002] Water-lubricated rubber bearings have the advantages of simple structure, low installation cost, low heat generation under high-speed conditions, clean and pollution-free, but they also have the disadvantage of low load-bearing capacity. In recent years, with the rapid development of high-performance rare earth permanent magnetic materials, products using permanent magnetic materials to form auxiliary support components have become a development direction of water-lubricated rubber bearing product design.

[0003] Existing magnetic composite water-lubricated rubber bearings are more concerned with sealing issues, while the water-lubricated rubber bearings used in the ship's stern shaft system are often in a seawater environment outside the cabin, so the shaft system will be subject to various impacts, which will damage the permanent magnets and demagnetize them, causing the permanent magnets to lose their function.

[0004] For example, patent CN201922020392.9 discloses a marine permanent magnetic suspension support water-lubricated bearing, which uses the permanent magnet inside the stator to provide an upward magnetic attraction to the rotating shaft, reduces the pressure of the rotating shaft on the bearing, and uses a gasket set between the end cover and the stator to achieve sealing between the end cover and the stator, but does not consider the impact resistance problem.

[0005] Patent CN201920936149.9 discloses a permanent magnet auxiliary support type water-lubricated bearing, including: a bearing housing, a magnet unit, a water-lubricated bearing body and a bearing end cover; the permanent magnet is located in the installation groove of the water-lubricated bearing body, and is sealed and connected to other parts of the equipment by the bearing end cover; the water-lubricated bearing body and the bearing end cover form a liquid isolation layer, which can completely isolate the corrosive liquid from the permanent magnet, thereby increasing the life of the permanent magnet. This solution also does not consider the problem of impact resistance.

[0006] In actual applications, if no impact protection structure is provided for the permanent magnet, when the propeller shaft system is subjected to various instantaneous impacts, the collision between the shaft and the permanent magnet will cause the permanent magnet to demagnetize or even break and demagnetize, thereby affecting the function of the permanent magnet to absorb the weight of the shaft. Therefore, the above technical solution is only suitable for in-cabin shaft system support in actual application. Summary of the invention

[0007] The purpose of the present invention is to solve the above technical problems and provide a magnetic composite water-lubricated rubber bearing with simple structure, easy manufacturing and maintenance, long service life, and good sealing and impact resistance.

[0008] The technical solution includes a bearing metal bushing and a bearing unit sleeved in the bearing metal bushing, wherein the bearing unit is composed of an upper magnet unit assembly and a lower water-lubricated rubber half-bearing, which are spliced ​​into a complete cylindrical shape; the magnet unit assembly includes a magnet unit and a bearing protection assembly located at both ends of the magnet unit, and the end face of the bearing protection assembly is flush with the bearing metal bushing; the inner wall of the magnet unit and the space between the magnet unit and the water-lubricated rubber half-bearing are sealed in an integrated manner using a rubber sealing sheet.

[0009] The cross section of the magnet unit assembly is sector-shaped or semi-annular.

[0010] The bearing bush protection assembly is composed of an outer end metal bush and an inner end rubber bush.

[0011] The surface height of the end rubber bearing bush is higher than the surface height of the rubber sealing sheet.

[0012] The thickness of the end rubber bearing bush should meet the requirement of ensuring that the surface height of the end rubber bearing bush is higher than the surface height of the rubber sealing sheet after being impacted.

[0013] The rubber material of the end rubber bearing bushing meets the requirements of a wear rate of no more than 0.1 mm / h and an impact strength of no less than 20 KJ / m 2 .

[0014] The two ends of the rubber sealing sheet are bent downward and inserted into the gap between the water-lubricated rubber half-bearing shell and the bearing metal bushing.

[0015] The water-lubricated rubber half-bearing bush is composed of an outer metal lining bush and an inner rubber bearing bush.

[0016] In view of the problems in the background technology, the inventors have made the following improvements:

[0017] (1) The upper magnet unit assembly and the lower water-lubricated rubber half-bearing are spliced ​​into a complete cylinder, and a rubber sealing sheet is used to achieve an integrated seal on the inner wall of the magnet unit and between the magnet unit and the water-lubricated rubber half-bearing. At the same time, the magnet unit is wrapped and limited to prevent seawater from leaking into the magnet unit assembly from the rotating shaft and the water-lubricated rubber half-bearing, thereby ensuring the radial sealing effect; a bearing protection assembly is provided at both ends of the magnet unit, and the bearing protection assembly is used to achieve the axial sealing of the magnet unit. Preferably, the two ends of the rubber sealing sheet are bent downward and inserted into the gap between the water-lubricated rubber half-bearing and the bearing metal bushing, which can also effectively prevent seawater from leaking into the magnet unit from the above-mentioned gap. At the same time, the bending and then inserting method also applies a pressing force to the rubber sealing sheet, further improving its sealing performance and avoiding the occurrence of its thermal expansion and contraction or deformation after being subjected to a force.

[0018] (2) The bearing protection assembly is composed of an outer end metal lining and an inner end rubber bearing, wherein the end metal lining plays the role of a rigid support and the end rubber bearing is elastic. When the shaft system is subjected to various instantaneous impacts, since the surface height of the end rubber bearing is higher than the surface height of the rubber sealing sheet, all impact forces will be absorbed by the end rubber bearings at both ends. Therefore, it is possible to well avoid the collision between the magnet unit (i.e., permanent magnet) and the rotating shaft, better protect the magnet unit from the impact force, and greatly improve the service life of the magnet unit. Since the end metal lining and the end rubber bearing are both located at both ends, they can also be easily maintained or replaced. Preferably, the thickness of the end rubber bearing should meet the requirement that the surface height of the end rubber bearing can still be higher than the surface height of the rubber sealing sheet after being impacted, and the material should meet the requirement that the wear rate is not greater than 0.1 mm / h and the impact strength is not less than 20 KJ / m 2 Further preferably, the low-noise nano / polymer composite material described in Patent No. CN201110271115.0 can be used, which has low noise, low friction coefficient, low wear, long life, and excellent impact resistance.

[0019] The invention has a simple structure, is easy to manufacture and maintain, has a long service life, and has excellent sealing and impact resistance properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axial cross-sectional view of the present invention.

[0021] Figure 2 for Figure 1 A partial enlarged view of part A in the middle.

[0022] Figure 3 It is a radial cross-sectional view of the present invention.

[0023] Among them, 1-bearing metal bushing, 2-metal lining, 3-water-lubricated rubber half-bearing, 4-end metal lining, 5-end rubber bearing, 6-magnet unit, 7-rubber sealing sheet, 7.1-arch section, 7.2-plane section, 7.3-bend section. DETAILED DESCRIPTION

[0024] The present invention will be further explained below in conjunction with the accompanying drawings:

[0025] See also Figure 1 The present invention comprises a bearing metal bushing 1 and a bearing unit sleeved in the bearing metal bushing, wherein the bearing unit is composed of an upper magnet unit assembly and a lower water-lubricated rubber half-bearing 3, and the two can be spliced ​​into a complete cylindrical shape;

[0026] The magnet unit assembly includes a magnet unit 6 (i.e., a permanent magnet) and a bearing bush protection assembly located at both ends of the magnet unit 6, wherein the end surface of the bearing bush protection assembly is flush with the bearing metal bushing 1; the inner wall of the magnet unit 6 and the end surface of the magnet unit 6 and the water-lubricated rubber half bearing 3 are sealed in an integrated manner using a rubber sealing sheet 7.

[0027] See also Figure 1 The bearing bush protection assembly is composed of an outer end metal bush 4 and an inner end rubber bush 5, wherein the end metal bush 4 is fixedly connected to the bearing metal bush 1 (such as bolted connection); preferably, see Figure 2 , the surface height of the end rubber bearing 5 is higher than the surface height of the rubber sealing sheet 7. The thickness of the end rubber bearing 5 is sufficient to meet the requirement that the surface height of the end rubber bearing 5 can still be higher than the surface height of the rubber sealing sheet 7 after being impacted. Preferably, the rubber material of the end rubber bearing 5 meets the requirements of a wear rate of no more than 0.1 mm / h and an impact strength of no less than 20 KJ / m 2 The low noise nano / polymer composite material described in patent number CN201110271115.0 is further preferred. The water lubricated rubber half bearing is composed of an outer metal liner 2 and an inner rubber bearing 3, wherein the metal liner 2 is fixedly connected to the bearing metal bushing 1 (eg, bolted).

[0028] See also Figure 3 The cross section of the magnet unit assembly is fan-shaped or semi-circular. The technicians in this field can select the magnet unit of the qualified size according to the needs and adapt the corresponding shape of the bearing protection assembly. The rubber sealing sheet 7 is pressed as a whole, including the arch section 7.1 covering the magnet unit 6, the flat section 7.2 on both sides of the arch section 7.1 located between the magnet unit 6 and the end face of the water-lubricated rubber half bearing 3, and the bent section 7.3 bent downward and inserted into the gap between the metal liner 2 and the bearing metal bushing 1. The rubber sealing sheet 7 with the above structure can achieve the purpose of efficient integrated sealing and preheating deformation failure.

[0029] Comparative experiment:

[0030] A comparative test of the impact resistance of the magnet unit of the magnetic composite water-lubricated bearing with and without the end bearing protection component, and a comparative test of the corrosion resistance with and without the rubber sealing sheet were conducted.

[0031] The magnetic composite water-lubricated bearings sealed with a rubber sealing sheet 7 (an embodiment of the present application) and without a rubber sealing sheet 7 were immersed in seawater for 45 days, and the magnetic force generated by the magnet unit was measured. The results are shown in the following table. Before and after immersion in seawater, the magnetic force of the unsealed magnet unit was attenuated by 10 KN, while the magnetic force of the sealed magnet unit was only attenuated by 0.5 KN. The results show that the rubber sealing sheet can protect the magnet unit from magnetic attenuation in a corrosive environment.

[0032] Bearing magnetic force before immersion in seawater (kN) Bearing magnetic force after immersion in seawater (kN) With seal 30 29.5 No seal 30 20

[0033] The impact device generates a radial impact force of 20KN and applies it to the magnet units of the magnetic composite water-lubricated bearings with and without end protection components. The magnetic force generated by the magnet units is measured after the impact. The results are shown in the following table. The magnetic force of the magnet unit without the end protection component is reduced by 14KN, and the magnetic force of the magnet unit with the end protection component is not reduced. The results show that the end protection component can protect the magnet unit from a reduction in magnetic force under radial impact.

[0034] Bearing magnetic force before impact (kN) Bearing magnetic force after impact (kN) With protection components 30 30 No protection components 30 16

Claims

1. A magnetic composite water-lubricated rubber bearing with impact resistance, comprising a bearing metal bushing and a bearing unit sleeved in the bearing metal bushing, characterized in that: The bearing unit is composed of an upper magnet unit assembly and a lower water-lubricated rubber half-bearing bush, which are spliced ​​into a complete cylindrical shape; the magnet unit assembly includes a magnet unit and a bearing bush protection assembly located at both ends of the magnet unit, and the end surface of the bearing bush protection assembly is flush with the bearing metal bushing; the inner wall of the magnet unit and the space between the magnet unit and the end rubber bearing bush are sealed in an integrated manner with a rubber sealing sheet; The bearing protection assembly consists of an outer end metal lining and an inner end rubber bearing; the two ends of the rubber sealing sheet are bent downward and inserted into the gap between the water-lubricated rubber half bearing and the bearing metal bushing; the water-lubricated rubber half bearing consists of an outer metal lining and an inner rubber bearing.

2. The magnetic composite water-lubricated rubber bearing with impact resistance as claimed in claim 1, characterized in that: The cross section of the magnet unit assembly is semi-annular.

3. The magnetic composite water-lubricated rubber bearing with impact resistance as claimed in claim 2, characterized in that: The surface height of the end rubber bearing bush is higher than the surface height of the rubber sealing sheet.

4. The magnetic composite water-lubricated rubber bearing with impact resistance as claimed in claim 3, characterized in that: The thickness of the end rubber bearing bush should meet the requirement of ensuring that the surface height of the end rubber bearing bush is higher than the surface height of the rubber sealing sheet after being impacted.

5. The magnetic composite water-lubricated rubber bearing with impact resistance according to claim 3 or 4, characterized in that: The rubber material of the end rubber bearing bushing meets the requirements of a wear rate of no more than 0.1 mm / h and an impact strength of no less than 20 KJ / m 2 .

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