Graphite self-lubricating bearing

Abstract

This invention provides a graphite self-lubricating bearing for use in the bearing industry. Compared to existing technologies where the grease is completely exposed between the outer and inner rings, this bearing, through the design of a self-lubricating cavity, can also conceal a portion of the grease. When the bearing reaches abnormally high temperatures, the grease in the self-lubricating cavity softens and becomes more fluid. At this time, the grease release strip gradually contracts, exerting a certain squeezing effect on the grease, causing some grease to gradually overflow from the self-lubricating cavity. During the rotation of the balls, this grease adheres to the balls, achieving a temporary supplementary and enhanced lubrication effect at high temperatures. Compared to existing technologies, this significantly reduces the impact of continuous high temperatures on bearing lubrication, thereby effectively preventing bearing damage and extending bearing service life.

Description

Technical Field

[0001] This application relates to the field of bearings, and in particular to a graphite self-lubricating bearing. Background Technology

[0002] Bearings are an important component in modern mechanical equipment. Their main function is to support rotating mechanical parts, reduce the coefficient of friction during their movement, and ensure their rotational accuracy.

[0003] During use, bearings generate heat due to high-speed rotation. Under high temperature and continuous friction, some of the grease may clump into particles, leading to decreased lubricity and potential damage to the bearing. Summary of the Invention

[0004] The purpose of this application is to automatically replenish a certain amount of grease when abnormal high temperatures occur, thereby alleviating the effects of high temperatures. Compared with the prior art, this application provides a graphite self-lubricating bearing, which includes an outer ring and an inner ring inside the outer ring. Multiple balls are placed between the inner ring and the inner wall of the outer ring. Both ends of the multiple balls are wrapped with binding rings. Sealing rings are inserted between the two side edges of the outer ring and the inner ring. The binding ring includes multiple evenly distributed ball-shaped pieces and multiple cavity-forming strips connected between two adjacent ball-shaped pieces. The end faces of two opposing cavity-forming strips in the two binding rings are interlocked, forming a self-lubricating cavity. An injection tube is fixedly connected to the outer end of one cavity-forming strip, and the injection tube communicates with the self-lubricating cavity. The self-lubricating cavity is filled with grease, and a grease release strip is also placed in the self-lubricating cavity, through which the grease is released.

[0005] By incorporating a self-lubricating cavity, compared to existing technologies where the grease is completely exposed between the outer and inner rings, this application, based on existing technologies, can also conceal a portion of the grease. When the bearing reaches abnormally high temperatures, the grease within the self-lubricating cavity softens and becomes more fluid. At this time, the grease release strip gradually contracts, exerting a certain squeezing effect on the grease, causing some grease to gradually overflow from the self-lubricating cavity. During the rotation of the balls, it adheres to the balls, achieving a temporary supplementary and enhanced lubrication effect at high temperatures. Compared to existing technologies, this significantly reduces the impact of continuous high temperatures on bearing lubrication, thereby effectively preventing bearing damage and extending bearing service life.

[0006] Furthermore, the ball-shaped plates and the cavity-forming strips in the two binding rings correspond to each other, and the two opposing ball-shaped plates form a binding ring that matches the ball. The binding ring can generate a binding force on the ball, so that it is in a relatively stable state between the outer ring and the inner ring. The spacing between multiple balls is not easily changed, effectively maintaining the stability of the bearing.

[0007] Furthermore, the cavity strip includes an outer bulge layer and an epitaxial layer fixedly connected to both sides of the outer bulge layer. The two opposing epitaxial layers are interlocked. The outer bulge layer has a semi-tubular structure, and the space between the two opposing outer bulge layers is the self-lubricating cavity. The planar sheet structure of the epitaxial layer makes the contact surface between the two binding rings relatively large, making the interlocking relatively stable and not easy to separate during bearing use. Both are made of heat-insulating material, which can effectively isolate some of the heat generated during bearing operation. This makes the grease in the self-lubricating space less affected by bearing temperature compared to the grease directly exposed between the outer and inner rings.

[0008] Furthermore, sealing plates are fixedly connected to both ends of the outer drum layer. The sealing plates are made of graphite with a porous structure and are attached to the surface of the ball. The sealing plates are used to intercept some of the grease, so that the grease is not easily leaked out completely at once.

[0009] Furthermore, the grease release strip includes two grease-pressing balls and a grease-controlling rope fixedly connected between the two grease-pressing balls. The grease-pressing balls have multiple grooves that are parallel to the cavity-forming strip. The diameter of the grease-pressing balls is the same as the inner diameter of the self-lubricating cavity, so that gaps are not easily formed between the grease-pressing balls and the self-lubricating cavity, making it difficult for the internal grease to flow out on its own. The grease-controlling rope is made of a two-way shape memory alloy material. When subjected to high temperature, the grease-controlling rope can contract, thereby squeezing the internal grease, allowing it to gradually be squeezed out.

[0010] Optionally, the grease control cord is composed of multiple interconnected two-way shape memory alloys, and the deformation critical temperature of the multiple two-way shape memory alloys gradually increases along the direction away from the grease pressure ball. This allows the shortening of the entire grease control cord to vary stepwise with the increase of temperature, rather than shortening completely when the critical temperature is reached. This allows the grease to overflow in multiple stages, rather than being squeezed out all at once.

[0011] Optionally, the grease control rope is further wrapped with an inner pressure bladder filled with air. The grease control rope includes a thermodynamic section inside the inner pressure bladder and two connecting ball sections outside the inner pressure bladder. The thermodynamic section is made of a two-way memory alloy material, and the connecting ball sections are made of a high-toughness material. The diameter of the grease-pressing ball is slightly smaller than the inner diameter of the self-lubricating cavity. Under the high temperature of the bearing during operation, the middle part begins to contract, which in turn drives the grease-pressing ball to move towards the middle, so that some grease can be squeezed out from the self-lubricating cavity and transferred to the ball surface along the pores on the sealing plate to complete self-lubrication. In addition, after the inner pressure bladder is heated, when the temperature has not reached the critical temperature, the air inside the inner pressure bladder expands due to heat, which can exert a certain squeezing effect on the grease from the inside, so that the grease can also be slowly released to the outside to assist lubrication.

[0012] Compared to existing technologies, the advantages of this application are:

[0013] By incorporating a self-lubricating cavity, compared to existing technologies where the grease is completely exposed between the outer and inner rings, this application, based on existing technologies, can also conceal a portion of the grease. When the bearing reaches abnormally high temperatures, the grease within the self-lubricating cavity softens and becomes more fluid. At this time, the grease release strip gradually contracts, exerting a certain squeezing effect on the grease, causing some grease to gradually overflow from the self-lubricating cavity. During the rotation of the balls, it adheres to the balls, achieving a temporary supplementary and enhanced lubrication effect at high temperatures. Compared to existing technologies, this significantly reduces the impact of continuous high temperatures on bearing lubrication, thereby effectively preventing bearing damage and extending bearing service life. Attached Figure Description

[0014] Figure 1 This is an exploded view of this application;

[0015] Figure 2 This is a perspective view of the present application;

[0016] Figure 3 This is a perspective view of the application after the sealing ring has been removed;

[0017] Figure 4 This is a perspective view of multiple balls in this application when they are restrained by a retaining ring.

[0018] Figure 5 This is a perspective view of the restraint ring of this application;

[0019] Figure 6 This is a schematic diagram of the self-lubricating cavity in this application;

[0020] Figure 7 This is a schematic diagram of the grease being squeezed out of the self-lubricating cavity in Embodiment 2 of this application;

[0021] Figure 8 This is a schematic diagram of the end of the grease trap in this application;

[0022] Figure 9 This is a schematic diagram of the grease strip in Embodiment 3 of this application.

[0023] Explanation of the labels in the diagram:

[0024] 1 Outer ring, 2 Inner ring, 3 Sealing ring, 4 Binding ring, 41 Beaded strip, 42 Cavity strip, 421 Outer bulge layer, 422 Outer extension layer, 5 Ball bearing, 6 Injection tube, 7 Sealing plate, 81 Pressure ball, 82 Pressure rope, 821 Hot section, 822 Connecting ball section, 9 Inner push bag. Detailed Implementation

[0025] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0026] Example 1:

[0027] A graphite self-lubricating bearing, please refer to Figure 1-3 It includes an outer ring 1, an inner ring 2 on the inner side of the outer ring 1, a plurality of balls 5 placed between the inner ring 2 and the inner wall of the outer ring 1, and a binding ring 4 wrapped around both ends of the plurality of balls 5. A sealing ring 3 is inserted between the two side edges of the outer ring 1 and the inner ring 2.

[0028] like Figure 4-5 The binding ring 4 includes multiple evenly distributed beaded pieces 41 and multiple cavity-forming strips 42 respectively connected between two adjacent beaded pieces 41. The end faces of two opposing cavity-forming strips 42 in the two binding rings 4 are interlocked, and the two opposing cavity-forming strips 42 form a self-lubricating cavity. An injection tube 6 is fixedly connected to the outer end of one of the cavity-forming strips 42, and the injection tube 6 communicates with the self-lubricating cavity. The beaded pieces 41 and cavity-forming strips 42 in the two binding rings 4 correspond to each other, and a binding ring matching the ball 5 is formed between two opposing beaded pieces 41. The binding ring can generate a binding force on the ball 5, so that it is in a relatively stable state between the outer ring 1 and the inner ring 2. The spacing between the multiple balls 5 is not easily changed, effectively maintaining the stability of the bearing.

[0029] The cavity strip 42 includes an outer bulging layer 421 and an outer extension layer 422 fixedly connected to both sides of the outer bulging layer 421. The two opposite outer extension layers 422 are interlocked with each other. The outer bulging layer 421 has a semi-tubular structure. The space between the two opposite outer bulging layers 421 is the self-lubricating cavity. The planar sheet structure of the outer extension layer 422 makes the contact surface between the two binding rings 4 relatively large, making the interlocking relatively stable and not easy to separate during bearing use. Both are made of heat insulation material, which can effectively isolate part of the heat generated during bearing operation. This makes the grease in the self-lubricating space less affected by bearing temperature compared to the grease directly exposed between the outer ring 1 and the inner ring 2.

[0030] Both ends of the outer drum layer 421 are fixedly connected with sealing plates 7. The sealing plates 7 are porous structures made of graphite, and the sealing plates 7 are attached to the surface of the ball 5. The sealing plates 7 are used to intercept some of the grease, so that the grease is not easily leaked out completely at one time. At the same time, the sealing plates 7 themselves can act as a lubricant and provide some lubrication when they come into contact with the ball 5.

[0031] Please see Figure 6The self-lubricating cavity is filled with grease, and a grease release strip is also placed inside the self-lubricating cavity. The grease release strip passes through the grease and includes two grease-pressing balls 81 and a grease-controlling rope 82 fixedly connected between the two grease-pressing balls 81. Multiple grease-pressing balls 81 are cut with multiple 83 parallel to the cavity-forming strip 42. The diameter of the grease-pressing balls 81 is the same as the inner diameter of the self-lubricating cavity, so that it is not easy for gaps to form between the grease-pressing balls 81 and the self-lubricating cavity, so that the grease inside is not easy to flow out on its own. The grease-controlling rope 82 is made of a two-way memory alloy material. When subjected to high temperature, the grease-controlling rope 82 can contract, thereby squeezing the grease inside, so that it can be gradually squeezed out along the 83.

[0032] Furthermore, the grease ball 81 is made of a non-insulating material, which makes the grease near the grease ball 81 relatively fluid when the bearing is operating at high temperatures, and it is easily squeezed out at high temperatures. Through the self-lubricating cavity, compared to the existing technology where the grease is completely exposed between the outer ring 1 and the inner ring 2, this application can hide part of the grease. When the bearing reaches abnormally high temperatures, the grease in the self-lubricating cavity softens and becomes more fluid. At this time, the grease release strip gradually contracts, exerting a certain squeezing effect on the grease, causing some grease to gradually overflow from the self-lubricating cavity. During the rotation of the ball 5, it adheres to the ball 5, achieving a temporary supplementary and enhanced lubrication effect at high temperatures. Compared to the existing technology, this significantly reduces the impact of continuous high temperatures on bearing lubrication, thereby effectively preventing bearing damage and extending bearing service life.

[0033] Example 2:

[0034] Please see Figure 7-8 The grease control rope 82 is composed of multiple interconnected two-way memory alloys. Along the direction away from the grease-pressing ball 81, the deformation critical temperature of the multiple two-way memory alloys gradually increases, so that the shortening range of the entire grease control rope 82 can show a step-like change with the increase of temperature, instead of shortening completely when the critical temperature is reached. This allows the grease to overflow in multiple times, instead of being squeezed out all at once.

[0035] This solution replaces the fat-controlling rope 82 in Example 1, while the rest remains the same as in Example 1.

[0036] Example 3:

[0037] Please see Figure 9The grease control rope 82 is wrapped around an inner push bladder 9, which is filled with air. The grease control rope 82 includes a thermodynamic section 821 inside the inner push bladder 9 and two connecting ball sections 822 outside the inner push bladder 9. The thermodynamic section 821 is made of a two-way memory alloy material, and the connecting ball sections 822 are made of a high-toughness material. The diameter of the grease compression ball 81 is slightly smaller than the inner diameter of the self-lubricating cavity. Under the high temperature of the bearing during operation, the middle part of 821 begins to contract, which in turn drives the grease compression ball 81 to move towards the middle, so that some grease can be squeezed out from the self-lubricating cavity and transferred to the surface of the ball 5 along the gap on the sealing plate 7, thus completing self-lubrication. In addition, when the inner push bladder 9 is heated, if the temperature has not reached the critical temperature, the air inside the inner push bladder 9 expands due to heat, which can exert a certain squeezing effect on the grease from the inside, so that the grease can also be slowly released to the outside, thus assisting lubrication.

[0038] The internal bladder 9 is made of elastic material, which allows it to adapt to the expansion of air at high temperatures.

[0039] The same effect as in Embodiment 1 can be achieved in this embodiment. In specific implementation, those skilled in the art can choose a method to implement it as needed.

[0040] The above description is only the best implementation method adopted in this application in combination with current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A graphite self-lubricating bearing, comprising an outer ring (1), characterized in that, The outer ring (1) is provided with an inner ring (2) on its inner side. Multiple balls (5) are placed between the inner ring (2) and the inner wall of the outer ring (1). Both ends of the multiple balls (5) are wrapped with binding rings (4). Sealing rings (3) are inserted between the two side edges of the outer ring (1) and the inner ring (2). The binding ring (4) includes multiple evenly distributed beaded pieces (41) and multiple cavity strips (42) respectively connected between two adjacent beaded pieces (41). The end faces of two cavity strips (42) in the two binding rings (4) are close to each other and interlocked. The two cavity strips (42) form a self-lubricating cavity. An injection tube (6) is fixedly connected to the outer end of one cavity strip (42). The injection tube (6) communicates with the self-lubricating cavity. The self-lubricating cavity is filled with grease. A grease release strip is also placed in the self-lubricating cavity. The grease release strip penetrates the grease. The fat release strip includes two fat-pressing balls (81) and a fat-controlling rope (82) fixedly connected between the two fat-pressing balls (81). The fat-pressing balls (81) have multiple (83) cut out parallel to each other with the cavity strip (42). The diameter of the grease-pressing ball (81) is the same as the inner diameter of the self-lubricating cavity, and the grease-controlling rope (82) is made of a two-way memory alloy material; The fat control rope (82) is composed of multiple interconnected two-way memory alloys, and the deformation critical temperature of the multiple two-way memory alloys gradually increases along the direction away from the fat pressure ball (81). The fat control rope (82) is also wrapped with an inner push bladder (9) in the middle. The inner push bladder (9) is filled with air. The fat control rope (82) includes a thermodynamic section (821) located inside the inner push bladder (9) and two ball-shaped sections (822) located outside the inner push bladder (9).

2. The graphite self-lubricating bearing according to claim 1, characterized in that, In the two binding rings (4), the beaded pieces (41) correspond to each other, and the cavity strips (42) correspond to each other, and the two opposing beaded pieces (41) form a binding ring that matches the ball (5).

3. The graphite self-lubricating bearing according to claim 1, characterized in that, The cavity strip (42) includes an outer bulging layer (421) and an epitaxial layer (422) fixedly connected to both sides of the outer bulging layer (421), with the two opposing epitaxial layers (422) interlocked with each other.

4. A graphite self-lubricating bearing according to claim 3, characterized in that, The outer drum layer (421) has a semi-tubular structure, and the outer extension layer (422) has a planar sheet structure, both of which are made of heat-insulating material.

5. A graphite self-lubricating bearing according to claim 4, characterized in that, Both ends of the outer drum layer (421) are fixedly connected with sealing pieces (7). The sealing pieces (7) are porous structures made of graphite, and the sealing pieces (7) are attached to the surface of the ball (5).

6. A graphite self-lubricating bearing according to claim 1, characterized in that, The thermal section (821) is made of a two-way memory alloy material, and the ball-connecting section (822) is made of a high-toughness material.

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