Self-lubricating roller bearing

Abstract

The invention relates to the technical field of bearings, in particular to a self-lubricating roller bearing which comprises an oil storage cavity, an oil discharge assembly, an adjusting assembly and an oil return assembly. The oil storage cavity is formed in the bearing inner ring; the oil discharge component is arranged on the outer ring of the oil storage cavity; the adjusting assembly is arranged in the oil storage cavity; the oil return assembly is connected between the bearing outer ring and the bearing inner ring; lubricating oil of the bearing inner ring is discharged through centrifugal force generated by rotation of the bearing inner ring, the sectional area of a lubricating oil discharging path changes along with temperature changes, the flowing speed of the discharged lubricating oil is increased, the lubricating oil is refined into small oil drops, and the lubricating oil is evenly distributed at the position where accumulation is prone to occurring under stirring of the even rotating plate; the lubricating oil can circularly flow in the bearing under the action of the oil return assembly; therefore, the problem that lubricating oil is accumulated and cannot be uniformly distributed on a friction surface due to the fact that the working clearance is enlarged due to thermal expansion of the bearing in a high-temperature state is solved.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, in particular to a self-lubricating roller bearing. Background Art

[0002] Bearings are important parts used to support mechanical rotating bodies, reduce the friction coefficient during rotation and improve rotation accuracy. Currently, bearings on the market are mainly divided into sliding bearings, rolling bearings and spherical bearings. Rolling bearings are the most widely used type of bearings in modern mechanical equipment. Traditional bearings need to be regularly lubricated with oil or grease after a period of use to maintain their good working condition. For bearings used in high temperature, high pressure or occasions where frequent maintenance is not possible, the lubricant will be consumed quickly and cannot be replenished properly. Therefore, self-lubricating bearings came into being.

[0003] In a self-lubricating roller bearing, an oil chamber is provided in the bearing structure. A self-lubricating bearing with an oil chamber usually achieves lubrication by delivering the lubricating oil in the oil chamber to the friction position through high-speed rotation of the bearing. However, when the bearing rotates at high speed, the bearing temperature will rise rapidly, causing the lubricating oil to evaporate rapidly. Lubricants such as grease will also experience oil precipitation at high temperatures, resulting in reduced lubrication effect. Under low temperature and low speed conditions, if the lubricating oil is still discharged according to the discharge volume at high temperature, it will cause excess lubricating oil, thereby causing oil leakage or eddy current friction. In response to the above problems, the prior art has proposed good solutions, such as a high-precision self-lubricating bearing with patent publication number CN116658525B, which adjusts the overlap between the oil discharge groove and the cut-off hole by transferring the temperature of the bearing to a thermal expansion medium and driving the sliding vane to move through the thermal expansion medium. After the temperature drops, the sliding vane will be gradually pulled back, reducing the amount of discharged oil. The amount of oil discharged is automatically adjusted by temperature changes to meet different oil discharge requirements at high and low temperatures.

[0004] Although the existing technology has solved the problem that self-lubricating bearings cannot adjust the oil output according to the oil demand at different temperatures, the following problems still exist: for large bearings used in heavy machinery, the temperature of the bearings will rise rapidly due to high bearing load, and when the temperature rises, the rolling elements, inner rings and outer rings of the bearings will expand under the heat, which will cause the working clearance of the bearings to increase. When the clearance increases, the lubricating oil that has flowed out will accumulate, resulting in the lubricating oil being unable to be evenly distributed on the friction surface, and the oil film thickness formed on the friction surfaces of the rolling elements and the inner and outer rings of the bearings is not enough. At this time, due to the high bearing temperature, the lubricating oil on the friction surface will be quickly consumed, exacerbating the wear of the bearing.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs a self-lubricating roller bearing. Summary of the invention

[0006] The present invention provides a self-lubricating roller bearing, which solves the problem that the working clearance becomes larger due to thermal expansion of the bearing under high temperature conditions, thereby causing the lubricating oil to accumulate and cannot be evenly distributed on the friction surface. The present invention uses the centrifugal force of the rotation of the inner ring of the bearing to discharge the lubricating oil from the inner ring of the bearing. The cross-sectional area of ​​the lubricating oil discharge path will change with the temperature, and the flow rate of the discharged lubricating oil will be increased and refined into fine oil droplets. The lubricating oil is evenly distributed in the position where it is easy to accumulate under the toggle of the uniform rotating plate. The lubricating oil will also form a circulating flow in the bearing under the action of the oil return component.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A self-lubricating roller bearing comprises a bearing outer ring, a rolling element, a bearing inner ring and a retaining frame, and also comprises an oil storage chamber, an oil discharge assembly, an adjustment assembly and an oil return assembly; the oil storage chamber is opened inside the bearing inner ring; the oil discharge assembly is arranged on the outer ring of the oil storage chamber; the adjustment assembly is arranged in the oil storage chamber; the oil return assembly is connected between the bearing outer ring and the bearing inner ring; when the bearing inner ring rotates with the shaft, the lubricating oil in the oil storage chamber is discharged from the oil storage chamber by centrifugal force, and as the temperature of the bearing inner ring changes, the adjustment assembly slides to change the cross-sectional area of ​​the lubricating oil passage path, the oil discharge assembly rotates with the retaining frame, comes into contact with the lubricating oil and shakes, and the lubricating oil flowing through the oil discharge assembly is distributed on the bearing outer ring and enters the oil return assembly through the bearing outer ring, and the oil return assembly redirects the lubricating oil back to the oil storage chamber to complete the lubricating oil circulation.

[0009] Preferably, the oil discharge assembly includes centrifugal oil holes and a uniform rotating plate; the centrifugal oil holes are arranged in a circumferential array on the outer wall of the oil storage cavity; an oil uniforming groove is arranged in a circumferential array on the retaining frame; and the uniform rotating plate is rotatably mounted on the oil uniforming groove.

[0010] In the above scheme, the centrifugal oil hole can be used to make the inner ring of the bearing rotate with the shaft to use centrifugal force to throw out the lubricating oil in the oil storage chamber, thereby realizing automatic replenishment of the lubricating oil. Moreover, since the lubricating oil is thrown from the inner ring of the bearing to the outer ring of the bearing under the action of centrifugal force, the lubricating oil can be quickly distributed on the inner ring of the bearing, the outer ring of the bearing and the surface of the rolling element, thereby improving the uniformity of the distribution of the lubricating oil. The position of the uniform plate is a position where the lubricating oil is prone to accumulate. When the rolling element drives the retaining frame to rotate, the uniform rotating plate will shake under the action of the tangential force, thereby spreading the lubricating oil at the accumulation position on the friction surface.

[0011] Preferably, an elastic torsion spring is connected between the uniform rotation plate and the retaining frame.

[0012] In the above scheme, when a deflection torque is generated between the uniform rotating plate and the lubricating oil, the elastic torsion spring can help the uniform rotating plate to rebound, and the rebound force of the elastic torsion spring can help the uniform rotating plate to shake quickly and the lubricating oil can be quickly and evenly distributed on the friction surface under the rotation of the retaining frame.

[0013] Preferably, the cross-section of the oil-distributing groove is I-shaped; and arc-shaped surfaces are provided at both ends of the oil-distributing rotating plate.

[0014] In the above scheme, when the lubricating oil passes through the oil equalizing groove, its path is first wide, then narrow and finally wide. At this time, under the pressure exerted by the shaking of the equalizing rotating plate, the lubricating oil will quickly pass through the middle section of the oil equalizing groove, and the flow rate in the middle section of the oil equalizing groove is high and the pressure is low, which will cause the excess lubricating oil on the outside of the inner ring of the bearing to be quickly diverted to the oil equalizing groove position, and because the equalizing rotating plate rotates with the retaining frame and the rolling element, it is equivalent to a centrifugal pump structure. When the lubricating oil passes through the curved surface of the equalizing rotating plate, it will cause unequal pressure on both sides of the equalizing rotating plate, thereby increasing the shaking amplitude of the equalizing rotating plate. Combined with the lubricating oil passing through the middle section of the oil equalizing groove to the outer ring of the bearing from narrow to wide, the lubricating oil can be further diffused to the inner wall surface of the outer ring of the bearing to avoid accumulation, while increasing the fluidity of the lubricating oil to further improve the lubrication effect.

[0015] Preferably, the adjustment component includes an expansion groove, an adjustment plate and a return spring; the expansion groove is symmetrically arranged on the outer ring of the oil storage cavity; the adjustment plate is slidably installed in the expansion groove, and a plurality of conducting holes are arranged on the adjustment plate; the return spring is connected between the adjustment plate and the expansion groove on one side, and the expansion groove on the other side is filled with a thermal expansion material.

[0016] In the above scheme, when the heat of the bearing rises, the thermal expansion material expands, and the extrusion adjustment plate slides at this time. The aperture of the centrifugal oil hole can be changed through the movement of the adjustment plate, so as to adapt to the temperature change to adjust the aperture of the centrifugal oil hole, thereby achieving the purpose of adjusting the discharge amount of lubricating oil.

[0017] Preferably, the centrifugal oil hole is a conical hole with the cone tip facing one side of the oil storage chamber; and the conducting hole is a conical hole with the direction opposite to the centrifugal oil hole.

[0018] In the above scheme, the centrifugal oil hole and the guide hole will form a Venturi nozzle structure when they are completely overlapped and overlapped. Under the action of centrifugal force, the lubricating oil will pass through the large aperture to the small aperture and then to the large aperture, so that the lubricating oil will change from coarse to fine in the middle section, thereby increasing the flow rate. At this time, the lubricating oil passing through the structure will be differentiated into fine oil droplets. Since the oil droplets are refined, they can cover a wider lubrication surface, increasing the contact area between the oil film and the friction surface, thereby improving the lubrication performance. After the lubricating oil is thrown out of the oil storage cavity under the centrifugal force, it will be further quickly dispersed under the tangential resistance on the outer side of the inner ring of the bearing and distributed on the friction surface.

[0019] Preferably, the oil return assembly includes a collecting chamber, a fixed groove, a rotating groove and an oil retaining ring; the collecting chamber is opened in the outer ring of the bearing; the fixed groove is symmetrically opened on both sides of the outer ring of the bearing; the rotating groove is symmetrically opened on both sides of the inner ring of the bearing; the outer ring of the oil retaining ring is fixedly installed on the outer ring of the bearing, and the inner ring is movably installed on the inner ring of the bearing.

[0020] In the above scheme, by setting the oil retaining ring, on the one hand, the rolling element can be isolated from the outside world, thereby preventing the lubricating oil from being thrown out of the bearing under the centrifugal action and causing loss; on the other hand, it can prevent external dust from entering the bearing to cause lubricating oil contamination and avoid damage to the rolling element.

[0021] Preferably, a reflux hole 1 is provided on the circumference of the fixed groove; a reflux hole 2 connected to the reflux hole 1 is provided on the oil retaining ring, and a reflux cavity is provided in the oil retaining ring; and reflux holes 3 are provided on both sides of the circumference of the oil storage cavity.

[0022] In the above scheme, the lubricating oil in the oil storage chamber is thrown to the outer ring of the bearing under the action of centrifugal force, and the lubricating oil collected in the outer ring of the bearing flows into the reflux chamber in the oil retaining ring through a reflux hole 1 opened on the outer ring of the bearing, and enters the rotating groove through the reflux chamber, and then returns to the oil storage chamber from the rotating groove, so that the lubricating oil can circulate inside the bearing, thereby reducing the waste of lubricating oil and avoiding the accumulation of lubricating oil. The flow circulation of lubricating oil can further improve the lubrication effect of the friction surface, and at the same time avoid excessive lubricating oil caused by continuous oil replenishment of the friction surface by the self-lubricating bearing, avoid lubricating oil overflow caused by excess lubricating oil and the formation of an oil film that is too thick, which increases the friction resistance.

[0023] Preferably, an oil suction hole is opened on the inner wall of the collecting chamber; the oil suction hole is a conical structure, and the hole is filled with silicone sponge.

[0024] In the above scheme, since the lubricating oil in the bearing occupies about 1 / 3 to 2 / 3 of the internal space of the bearing, in order to prevent the lubricating oil in the oil storage chamber from being in a released state all the time when the bearing rotates at high speed, resulting in excessive oil in the internal space of the bearing, the lubricating oil can be guided to the collection chamber of the outer ring through the oil suction hole structure. Since the bearing is under greater pressure from the outside when the bearing rotates at high speed, the oil suction hole is filled with silicone sponge. On the one hand, it can prevent the lubricating oil from exerting greater pressure on the outer ring of the bearing under the action of centrifugal force, resulting in the oil film thickness being reduced by entering the collection chamber too quickly. On the other hand, the silicone sponge can form a one-way valve under the centrifugal pressure of the lubricating oil, so that the lubricating oil can smoothly enter the collection chamber, and the silicone sponge can work normally in an environment with a temperature greater than 200 degrees.

[0025] Preferably, sealing lips are provided on both side end faces of the inner ring of the oil retaining ring; and the cross section of the sealing lips is an arc-shaped structure.

[0026] In the above scheme, since the oil retaining ring and the rotating groove of the bearing inner ring are movably connected, the oil retaining ring moves in the opposite direction to the bearing inner ring when the bearing inner ring rotates, and since the reflux chamber and the rotating groove are connected, the refluxed lubricating oil will flow to the sealing lip position, thereby forming an oil film at the sealing lip position for oil sealing. On the one hand, it can reduce the wear between the oil retaining ring and the rotating groove and increase the service life of the oil retaining ring. On the other hand, after the oil seal is formed, the sealing performance can be further improved to prevent the lubricating oil from flowing out.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Compared with the existing self-lubricating roller bearings, the present invention uses centrifugal force to evenly throw the lubricating oil onto the friction surface, thereby improving the uniformity of the distribution of the lubricating oil; between every two rolling elements is a position where the lubricating oil is prone to accumulate, and an oil equalizing groove is provided on the retaining frame so that the lubricating oil at the position where it is prone to accumulate can flow, and a uniform rotating plate is provided in the oil equalizing groove. When the lubricating oil passes through the oil equalizing groove by centrifugal force, it is accelerated under the structural action of the oil equalizing groove and passes through the arc surface of the uniform rotating plate, so that a pressure difference is formed on both sides of the uniform rotating plate, so that the uniform rotating plate can rotate significantly, thereby increasing the fluidity of the lubricating oil, and the lubricating oil reaching the outer ring position of the bearing under the swing of the uniform rotating plate is evenly diffused to avoid accumulation, thereby improving the lubrication effect.

[0029] 2. The present invention sets an oil return assembly, and the lubricating oil in the oil storage chamber is thrown to the outer ring of the bearing under the action of centrifugal force. The lubricating oil collected by the outer ring of the bearing is returned to the oil storage chamber through the oil retaining ring, so that the lubricating oil circulates inside the bearing. On the one hand, the waste of lubricating oil flowing out can be avoided by the oil retaining ring. On the other hand, the reflux channel formed by the oil retaining ring can help the lubricating oil to form a flow circulation, increase the fluidity of the lubricating oil and avoid the accumulation of the lubricating oil. The circulating lubricating oil can help to further improve the lubrication effect of the friction surface, and at the same time avoid the continuous injection of lubricating oil into the self-lubricating bearing, resulting in excess lubricating oil, which causes the lubricating oil to overflow, or the formation of an oil film that is too thick, which increases the friction resistance.

[0030] 3. The present invention provides an adjustment plate, which can slide as the temperature rises, so that the overlap between the centrifugal oil hole and the conducting hole on the adjustment plate increases, thereby achieving the purpose of adjusting the lubricating oil discharge amount. While the discharge amount is adjusted, the cross-section of the lubricating oil outflow path formed between the centrifugal oil hole and the conducting hole gradually decreases and then gradually increases, so that the flow rate of the lubricating oil can be increased, the fluidity of the lubricating oil is improved, and the accumulation of the lubricating oil is avoided. The lubricating oil that flows out will be differentiated into fine oil droplets, which can cover a wider friction surface and improve the lubrication performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is an exploded view of the overall structure of the present invention;

[0033] Figure 2 is a three-dimensional cross-sectional view of the present invention;

[0034] Figure 3 is an axial cross-sectional view of the present invention;

[0035] Figure 4 is a radial cross-sectional view of the present invention;

[0036] Figure 5 It is a schematic diagram of the uniform rotating plate structure of the present invention;

[0037] Figure 6 for Figure 3 A magnified view of the structure at center;

[0038] Figure 7 for Figure 3 A magnified view of the structure at B in the middle;

[0039] Figure 8 for Figure 4 A magnified view of the structure at C in the middle;

[0040] Fig. 9 This is a schematic diagram of the lubricating oil flow of the present invention;

[0041] In the figure: 1. bearing outer ring; 2. rolling element; 3. bearing inner ring; 4. retaining frame; 41. oil uniform groove; 5. oil storage chamber; 51. reflux hole three; 6. oil discharge assembly; 61. centrifugal oil hole; 62. uniform rotating plate; 621. elastic torsion spring; 622. arc surface; 7. adjustment assembly; 71. expansion groove; 72. adjustment plate; 721. conduction hole; 73. reset spring; 8. oil return assembly; 81. collection chamber; 811. oil suction hole; 812. silicone sponge; 82. fixed groove; 821. reflux hole one; 83. rotating groove; 84. oil retaining ring; 841. reflux hole two; 842. reflux chamber; 843. sealing lip. DETAILED DESCRIPTION

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] See also Figures 1 to 9 The present invention provides a self-lubricating roller bearing, and the technical solution is as follows:

[0044] As a specific embodiment of the present invention, refer to Figure 1 and Figure 2 A self-lubricating roller bearing comprises a bearing outer ring 1, rolling elements 2, a bearing inner ring 3 and a retaining frame 4, and also comprises an oil storage chamber 5, an oil discharge assembly 6, an adjustment assembly 7 and an oil return assembly 8; the oil storage chamber 5 is opened inside the bearing inner ring 3; the oil discharge assembly 6 is arranged on the outer ring of the oil storage chamber 5; the adjustment assembly 7 is arranged in the oil storage chamber 5; the oil return assembly 8 is connected between the bearing outer ring 1 and the bearing inner ring 3; when the bearing inner ring 3 rotates with the shaft, the lubricating oil in the oil storage chamber 5 is discharged from the oil storage chamber 5 by centrifugal force, and the adjustment assembly 7 slides with the temperature change of the bearing inner ring 3 The cross-sectional area of ​​the lubricating oil passage path is dynamically changed, thereby achieving the purpose of adjusting the lubricating oil outflow according to the temperature. The oil discharge component 6 rotates with the retaining frame 4, contacts the lubricating oil and shakes, so that the fluidity of the lubricating oil at the position where the lubricating oil is prone to accumulate is increased, and the lubricating oil is evenly distributed on the friction surface to avoid accumulation. The lubricating oil flowing through the oil discharge component 6 is distributed on the bearing outer ring 1 and enters the oil return component 8 through the bearing outer ring 1. The oil return component 8 redirects the lubricating oil back to the oil storage chamber 5 to complete the lubricating oil circulation, thereby avoiding the waste of lubricating oil and surplus accumulation.

[0045] As a specific embodiment of the present invention, refer to Figure 2, Figure 3 , Figure 4 , Figure 5 and Figure 8 The oil discharge assembly 6 includes a centrifugal oil hole 61 and a uniform rotating plate 62; the centrifugal oil holes 61 are arranged in a circumferential array on the outer wall of the oil storage chamber 5, so that the lubricating oil can flow out from the bearing inner ring 3 when flowing out under the action of centrifugal force, thereby reducing the possibility of lubricating oil accumulation; the retaining frame 4 is provided with a circumferential array of uniform oil grooves 41; the uniform rotating plate 62 is rotatably mounted on the uniform oil groove 41. The centrifugal oil hole 61 can make the inner ring 3 of the bearing rotate with the shaft to use centrifugal force to throw out the lubricating oil in the oil storage chamber 5, so as to realize automatic replenishment of the lubricating oil. In addition, since the lubricating oil is thrown from the inner ring 3 of the bearing to the outer ring 1 of the bearing under the action of centrifugal force, the lubricating oil can be quickly distributed on the surfaces of the inner ring 3 of the bearing, the outer ring 1 of the bearing and the rolling element 2, thereby improving the uniformity of the distribution of the lubricating oil. The position of the uniform plate is a position where the lubricating oil is prone to accumulate. When the rolling element 2 drives the retaining frame 4 to rotate, the uniform rotating plate 62 will shake under the action of the tangential force, thereby diffusing the lubricating oil at the accumulation position on the friction surface. An elastic torsion spring 621 is connected between the uniform rotating plate 62 and the retaining frame 4. When a deflection torque is generated between the uniform rotating plate 62 and the lubricating oil, the elastic torsion spring 621 can help the uniform rotating plate 62 to rebound, and the elastic torsion spring 621 can help the uniform rotating plate 62 to shake quickly, thereby improving the fluidity of the lubricating oil, and under the rotation of the retaining frame 4, the lubricating oil is quickly and evenly distributed on the friction surface. Since the uniform rotating plate 62 can evenly distribute the lubricating oil to the friction surfaces of the bearing outer ring 1 and the bearing inner ring 3 when shaking, the overall lubrication effect is guaranteed. The cross section of the oil uniforming groove 41 is I-shaped; arc surfaces 622 are provided at both ends of the uniform rotating plate 62. When the lubricating oil passes through the oil equalizing groove 41, its path is first wide, then narrow, and finally wide. At this time, under the pressure exerted by the shaking of the uniform rotating plate 62, the lubricating oil will quickly pass through the middle section of the oil equalizing groove 41, and the flow rate in the middle section of the oil equalizing groove 41 is high and the pressure is low, which will cause the excess lubricating oil on the outside of the bearing inner ring 3 to be quickly diverted to the oil equalizing groove 41. In addition, since the uniform rotating plate 62 rotates with the retaining frame 4 and the rolling element 2, it is equivalent to a centrifugal pump structure. When the lubricating oil passes through the arc surface 622 on the surface of the uniform rotating plate 62, it will cause unequal pressure on both sides of the uniform rotating plate 62, thereby increasing the shaking amplitude of the uniform rotating plate 62. Combined with the lubricating oil passing through the middle section of the oil equalizing groove 41 to the bearing outer ring 1 from narrow to wide, the lubricating oil can be further diffused to the inner wall surface of the bearing outer ring 1 to avoid accumulation. At the same time, the fluidity of the lubricating oil is increased to further improve the lubrication effect.

[0046] As a specific embodiment of the present invention, refer to Figure 3 and Figure 6The adjustment assembly 7 includes an expansion slot 71, an adjustment plate 72 and a reset spring 73; the expansion slot 71 is symmetrically arranged on the outer ring of the oil storage chamber 5; the adjustment plate 72 is slidably installed in the expansion slot 71, and a plurality of conducting holes 721 are arranged on the adjustment plate 72; the reset spring 73 is connected between the adjustment plate 72 and the expansion slot 71 on one side, and the expansion slot 71 on the other side is filled with a thermal expansion material. When the heat of the bearing rises, the thermal expansion material expands, and at this time, the adjustment plate 72 is pressed to slide. The aperture of the centrifugal oil hole 61 can be changed through the movement of the adjustment plate 72, so as to adjust the aperture of the centrifugal oil hole 61 to adapt to the temperature change, thereby achieving the purpose of adjusting the discharge amount of the lubricating oil.

[0047] As a specific embodiment of the present invention, refer to Figure 6 The centrifugal oil hole 61 is a conical hole with the cone tip facing the oil storage chamber 5; the conducting hole 721 is a conical hole in the opposite direction to the centrifugal oil hole 61. The centrifugal oil hole 61 and the guide hole 721 will form a Venturi nozzle structure when they are completely overlapped and in the overlap process. Under the action of centrifugal force, the lubricating oil will pass through the large aperture to the small aperture and then to the large aperture, so that the lubricating oil will change from coarse to fine in the middle section, thereby increasing the flow rate. At this time, the lubricating oil passing through the structure will be differentiated into fine oil droplets. Since the oil droplets are refined, they can cover a wider friction surface, increase the contact area between the oil film and the friction surface, and thus improve the lubrication performance; and when the temperature is low, since the overlap between the centrifugal oil hole 61 and the guide hole 721 is low, the amount of lubricating oil passing through will be reduced, and since the overlapping position area is small, the oil droplets differentiated into by the lubricating oil will be smaller, thereby ensuring that the lubricating oil outflow can also be evenly distributed on the friction surface when the amount is small. After the lubricating oil is thrown out of the oil storage cavity 5 under the centrifugal force, it will be further quickly dispersed and distributed on the friction surface under the tangential resistance on the outer side of the bearing inner ring 3.

[0048] As a specific embodiment of the present invention, refer to Figure 3 , Figure 6 , Figure 7 and Fig. 9The oil return assembly 8 includes a collecting chamber 81, a fixed groove 82, a rotating groove 83 and an oil retaining ring 84; the collecting chamber 81 is provided in the outer ring 1 of the bearing; the fixed groove 82 is symmetrically provided on both sides of the outer ring 1 of the bearing; the rotating groove 83 is symmetrically provided on both sides of the inner ring 3 of the bearing; the outer ring of the oil retaining ring 84 is fixedly installed with the outer ring 1 of the bearing, and the inner ring is movably installed with the inner ring 3 of the bearing. By setting the oil retaining ring 84, on the one hand, the rolling body 2 can be isolated from the outside world, thereby preventing the lubricating oil from being thrown out of the bearing under the centrifugal action and causing loss; on the other hand, it can prevent external dust from entering the bearing to cause lubricating oil pollution and avoid damage to the rolling body 2. A reflux hole 1 821 is provided on the circumference of the fixed groove 82; a reflux hole 2 841 connected to the reflux hole 1 821 is provided on the oil retaining ring 84, and a reflux chamber 842 is provided in the oil retaining ring 84; and reflux holes 3 51 are provided on both sides of the circumference of the oil storage chamber 5. The lubricating oil in the oil storage chamber 5 is thrown to the position of the bearing outer ring 1 under the action of centrifugal force. The lubricating oil collected in the bearing outer ring 1 flows into the reflux chamber 842 in the oil retaining ring 84 through a reflux hole 821 opened on the bearing outer ring 1, and enters the rotating groove 83 through the reflux chamber 842, and then returns to the oil storage chamber 5 through the rotating groove 83, so that the lubricating oil can circulate inside the bearing, thereby reducing the waste of lubricating oil and avoiding the accumulation of lubricating oil. The flow circulation of lubricating oil can further improve the lubrication effect of the friction surface, and at the same time avoid excessive lubricating oil caused by continuous oil replenishment of the friction surface by the self-lubricating bearing, avoid lubricating oil overflow caused by excess lubricating oil and the formation of an oil film that is too thick, which increases the friction resistance.

[0049] As a specific embodiment of the present invention, refer to Figure 7 An oil suction hole 811 is opened on the inner wall of the collecting chamber 81; the oil suction hole 811 is a conical structure, and the hole is filled with a silicone sponge 812. Since the lubricating oil in the bearing occupies about 1 / 3 to 2 / 3 of the internal space of the bearing, in order to prevent the lubricating oil in the oil storage chamber 5 from being in a released state when the bearing rotates at high speed, resulting in excessive oil in the internal space of the bearing, the lubricating oil can be guided to the collection chamber 81 of the outer ring through the oil suction hole 811 structure. Since the bearing is under great pressure from the outside when the bearing rotates at high speed, the oil suction hole 811 is filled with a silicone sponge 812. On the one hand, it can prevent the lubricating oil from exerting a large pressure on the outer ring 1 of the bearing under the action of centrifugal force, resulting in the oil film thickness being reduced by entering the collection chamber 81 too fast. On the other hand, the silicone sponge 812 can form a one-way valve under the centrifugal pressure of the lubricating oil, so that the lubricating oil can smoothly enter the collection chamber 81, and the silicone sponge 812 can work normally in an environment with a temperature greater than 200 degrees. At the same time, at the location where the lubricating oil accumulates, since the lubricating oil does not circulate here, the flow rate of the lubricating oil at the accumulation location is low and the pressure is high. When the pressure is high, the lubricating oil can accelerate the flow rate from the oil suction hole 811, thereby preventing the accumulation of lubricating oil from continuing to increase.

[0050] As a specific embodiment of the present invention, refer to Figure 3 and Figure 6 , sealing lips 843 are provided on both side end faces of the inner ring of the oil retaining ring 84; the cross section of the sealing lips 843 is an arc-shaped structure. Since the oil retaining ring 84 and the rotating groove 83 of the bearing inner ring 3 are movably connected, when the bearing inner ring 3 rotates, the oil retaining ring 84 moves in the opposite direction to the bearing inner ring 3, and since the reflux cavity 842 and the rotating groove 83 are in a connected state, the refluxed lubricating oil will flow to the sealing lip 843 position, thereby forming an oil film at the sealing lip 843 position for oil sealing, which can reduce the wear between the oil retaining ring 84 and the rotating groove 83 and increase the service life of the oil retaining ring 84 on the one hand, and can further improve the sealing performance after the oil seal is formed to prevent the lubricating oil from flowing out on the other hand.

[0051] Working principle: the inner ring 3 of the bearing rotates with the shaft, and the lubricating oil in the oil storage chamber 5 is thrown out under the action of centrifugal force. The amount of lubricating oil discharged will increase with the increase of temperature, and the lubricating oil will be refined into fine oil droplets by the regulating component 7 and evenly distributed on the friction surface. The position where the thrown-out lubricating oil is prone to accumulation will be accelerated by the shaking action of the uniform rotating plate 62, and the lubricating oil accumulated on the inner wall of the outer ring 1 of the bearing will also enter the outer ring 1 of the bearing under pressure and return to the oil storage chamber 5 through the oil return component 8.

[0052] Specifically, when the bearing inner ring 3 rotates with the shaft, the lubricating oil in the oil storage chamber 5 will be thrown out to the outside of the bearing inner ring 3 under the action of centrifugal force. As the temperature of the bearing increases, the thermal expansion material in the expansion groove 71 will expand, causing the adjustment plate 72 to slide. At this time, the overlap between the guide hole 721 on the adjustment plate 72 and the centrifugal oil hole 61 gradually increases, thereby achieving the purpose of adjusting the lubricating oil discharge amount according to the temperature. When the lubricating oil passes through the channel formed by the guide hole 721 and the centrifugal oil hole 61, the lubricating oil flow area changes from large to small and then to large. When the flow area changes from large to small, the flow rate of the lubricating oil is improved. In the process of changing the flow area from small to large, the lubricating oil is divided into fine oil droplets, and when the bearing inner ring 3 rotates, the resistance formed on its outside will collide tangentially with the discharged fine oil droplets, thereby atomizing the fine oil droplets and evenly distributing them on the bearing inner ring 3, the rolling element 2 and the bearing outer ring 1, so that an oil film is evenly formed on the friction surface, thereby achieving the purpose of improving the lubrication effect.

[0053] As the temperature rises, the working clearance of the bearing increases. Since the flow channel formed by the oil-distributing groove 41 is from wide to thin and then to wide again, and the uniform rotating plate 62 is squeezed with the lubricating oil as the retaining frame 4 rotates, the flow rate of the lubricating oil in the middle section of the oil-distributing groove 41 increases and the pressure decreases, thereby generating a negative pressure zone. The lubricating oil at the position where the inner ring 3 of the bearing is prone to accumulation is guided to the position of the outer ring 1 of the bearing under the action of centrifugal force and negative pressure, and a centrifugal pump-like action is formed under the shaking action of the uniform rotating plate 62 and the rotation of the retaining frame 4, further increasing the lubricating oil in the outer ring 1 of the bearing. The fluidity of the lubricating oil at the accumulation position and the position where the lubricating oil is easy to accumulate on the bearing inner ring 3. The excess lubricating oil on the inner wall of the bearing outer ring 1 will enter the collecting chamber 81 in the bearing outer ring 1 from the oil suction hole 811 through the silicone sponge 812 under the pressure generated by the centrifugal force. The lubricating oil in the collecting chamber 81 will flow back to the oil storage chamber 5 through the reflux chamber 842 of the oil retaining ring 84 to complete the flow cycle. In the process of flowing back, part of the lubricating oil will form an oil seal at the sealing lip 843, so as to achieve the purpose of improving the sealing effect of the oil retaining ring 84 and extending the service life of the oil retaining ring 84.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A self-lubricating roller bearing, comprising a bearing outer ring (1), rolling elements (2), a bearing inner ring (3) and a cage (4), characterized in that: The bearing also comprises an oil storage chamber (5), an oil discharge assembly (6), an adjustment assembly (7) and an oil return assembly (8); the oil storage chamber (5) is provided inside the inner ring (3) of the bearing; the oil discharge assembly (6) is arranged on the outer ring of the oil storage chamber (5); the adjustment assembly (7) is arranged in the oil storage chamber (5); the oil return assembly (8) is connected between the outer ring (1) of the bearing and the inner ring (3); when the inner ring (3) of the bearing rotates with the shaft, the lubricating oil in the oil storage chamber (5) is discharged from the oil storage chamber (5) by centrifugal force; as the temperature of the inner ring (3) of the bearing changes, the adjustment assembly (7) slides to change the cross-sectional area of ​​the lubricating oil passage path; the oil discharge assembly (6) rotates with the retaining frame (4) and contacts the lubricating oil and shakes; the lubricating oil flowing through the oil discharge assembly (6) is distributed on the outer ring (1) of the bearing and enters the oil return assembly (8) through the outer ring (1) of the bearing; the oil return assembly (8) redirects the lubricating oil back to the oil storage chamber (5) to complete the lubricating oil circulation.

2. A self-lubricating roller bearing according to claim 1, characterized in that: The oil discharge assembly (6) comprises centrifugal oil holes (61) and a uniform rotating plate (62); the centrifugal oil holes (61) are arranged in a circumferential array on the outer wall of the oil storage cavity (5); the retaining frame (4) is provided with a circumferential array of oil uniforming grooves (41); and the uniform rotating plate (62) is rotatably mounted on the oil uniforming grooves (41).

3. A self-lubricating roller bearing according to claim 2, characterized in that: An elastic torsion spring (621) is connected between the uniform rotating plate (62) and the retaining frame (4).

4. A self-lubricating roller bearing according to claim 3, characterized in that: The cross section of the oil-distributing groove (41) is I-shaped; and arc-shaped surfaces (622) are provided at both ends of the oil-distributing rotating plate (62).

5. The self-lubricating roller bearing according to claim 2, characterized in that: The adjustment component (7) comprises an expansion groove (71), an adjustment plate (72) and a return spring (73); the expansion groove (71) is symmetrically arranged on the outer ring of the oil storage chamber (5); the adjustment plate (72) is slidably installed in the expansion groove (71), and a plurality of conducting holes (721) are arranged on the adjustment plate (72); the return spring (73) is connected between the adjustment plate (72) and the expansion groove (71) on one side, and the expansion groove (71) on the other side is filled with a thermal expansion material.

6. A self-lubricating roller bearing according to claim 5, characterized in that: The centrifugal oil hole (61) is a conical hole with the cone tip facing one side of the oil storage chamber (5); and the conducting hole (721) is a conical hole with a direction opposite to the centrifugal oil hole (61).

7. The self-lubricating roller bearing according to claim 1, characterized in that: The oil return assembly (8) comprises a collecting chamber (81), a fixed groove (82), a rotating groove (83) and an oil retaining ring (84); the collecting chamber (81) is arranged in the outer ring (1) of the bearing; the fixed groove (82) is symmetrically arranged on both sides of the outer ring (1) of the bearing; the rotating groove (83) is symmetrically arranged on both sides of the inner ring (3) of the bearing; the outer ring of the oil retaining ring (84) is fixedly mounted on the outer ring (1) of the bearing, and the inner ring is movably mounted on the inner ring (3) of the bearing.

8. A self-lubricating roller bearing according to claim 7, characterized in that: The fixing groove (82) is provided with a reflux hole 1 (821) on the circumference; the oil deflector ring (84) is provided with a reflux hole 2 (841) connected to the reflux hole 1 (821); a reflux cavity (842) is provided in the oil deflector ring (84); and the oil storage cavity (5) is provided with reflux holes 3 (51) arranged in a row on both sides of the circumference.

9. A self-lubricating roller bearing according to claim 8, characterized in that: An oil suction hole (811) is provided on the inner wall of the collecting chamber (81); the oil suction hole (811) is a conical structure, and is filled with a silica gel sponge (812).

10. The self-lubricating roller bearing according to claim 8, characterized in that: Sealing lips (843) are provided on both side end surfaces of the inner ring of the oil retaining ring (84); the cross section of the sealing lips (843) is an arc-shaped structure.

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