Packaging machine for bearing machining and packaging method thereof

Abstract

The invention discloses a packaging machine for bearing machining and a packaging method thereof, and relates to the field of bearing packaging.The packaging machine for bearing machining comprises an oil storage tank, a plurality of oil outlet holes are formed in the bottom of the oil storage tank, a first supporting plate is fixedly connected to one side of the oil storage tank, and an adjusting plate is arranged on the other side of the oil storage tank; the side, close to the first supporting plate, of the adjusting plate is rotationally connected with a stirring roller, and the stirring roller penetrates through the first supporting plate. A bearing is fixed between the two door-shaped plates, a motor is started to drive a first lead screw to rotate, a second lead screw rotates through mutual cooperation of a first chain wheel, a chain and a second chain wheel, rotation of the first lead screw and the second lead screw drives a connecting plate to move between the two door-shaped plates, and therefore the oil storage tank moves; in the moving process of the oil storage tank, lubricating oil in the oil storage tank falls into the surface of the bearing from the oil outlet hole, and in the process, the stirring roller evenly paves the lubricating oil on the surface of the bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing processing, and more specifically, to a packaging machine for bearing processing and a packaging method thereof. Background Art

[0002] Bearings are an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. The processing of bearings requires multiple processes, among which the packaging of bearings is the last step in the completion of a bearing. The packaging of bearings is crucial to the transportation of bearings. Bearings need lubricating oil for lubrication, so lubricating oil is indeed used when packaging bearings. Lubricating oil plays a vital role in the use and maintenance of bearings. It can reduce friction, reduce wear, and improve the life and performance of bearings. Applying a small amount of lubricating oil during packaging can not only reduce transportation friction, but also ensure that the packaging film fits tightly with the bearing, which plays a good protective role during the transportation of bearings.

[0003] The existing bearing packaging steps are to clean the surface of the bearing, then apply lubricating oil on the surface of the bearing, and finally stick a protective film on the surface of the lubricating oil. Since the existing bearing packaging steps often use manual application of lubricating oil to the bearing surface, it is difficult to centrally control the uniformity of the lubricating oil, resulting in uneven distribution of the lubricating oil on the bearing surface, thereby affecting the quality of the film pasting. Therefore, it needs to be improved. Summary of the invention

[0004] The present invention provides a packaging machine for bearing processing and a packaging method thereof, aiming to solve the above-mentioned problems in the prior art.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A packaging machine for bearing processing comprises an oil storage tank, a plurality of oil outlet holes are provided at the bottom of the oil storage tank, a first support plate is fixedly connected to one side of the oil storage tank, an adjusting plate is provided on the other side of the oil storage tank, a stirring roller is rotatably connected to the side of the adjusting plate close to the first support plate, the stirring roller passes through the first support plate, the stirring roller is slidably connected to the first support plate, a groove is provided on the side wall of the adjusting plate, a first rotating rod is rotatably connected in the groove, a rotating ball is fixedly connected to the outer wall of the first rotating rod, the rotating ball contacts with the bearing, an L-shaped plate is fixedly connected to the upper end of the adjusting plate, a sliding bar is fixedly connected to the side wall of the L-shaped plate, the sliding bar passes through one side of the oil storage tank, the sliding bar is slidably connected to the oil storage tank, and a spring is provided between the sliding bar and the oil storage tank.

[0007] As an optimal technical solution for the packaging machine for bearing processing, a ejector pin is arranged in the oil outlet hole, and a baffle plate is fixedly connected to the upper end of the ejector pin. The outer diameter of the baffle plate is larger than the inner diameter of the oil outlet hole, and the outer diameter of the ejector pin is smaller than the inner diameter of the oil outlet hole.

[0008] As an optimal technical solution for a packaging machine for bearing processing, the end of the slide bar away from the L-shaped plate is fixedly connected to a movable plate, the bottom of the movable plate is fixedly connected to a sliding block, the inner wall of the oil storage tank is fixedly connected to a second support plate, the surface of the second support plate is provided with a sliding groove, and the sliding block is slidably connected in the sliding groove.

[0009] As an optimal technical solution for the packaging machine for bearing processing, one end of the stirring roller away from the adjustment plate is fixedly connected to the limiting disk, one end of the spring is fixedly connected to the movable plate, and the other end of the spring is fixedly connected to the oil storage tank.

[0010] As an optimal technical solution for the packaging machine for bearing processing, a rack is fixedly connected to the surface of the movable plate, a first gear is arranged in the oil storage tank, the first gear and the rack are meshed with each other, the bottom of the first gear is connected to the second gear through a second rotating rod, the second rotating rod passes through the second support plate, the second rotating rod is rotatably connected to the second support plate, the bottom of the second gear is connected to a fourth rotating rod through a driven assembly, both ends of the fourth rotating rod are rotatably connected to the oil storage tank, and a spiral plate is fixedly connected to the outer wall of the fourth rotating rod.

[0011] As an optimal technical solution for the packaging machine for bearing processing, the driven component includes a third gear meshing with the second gear, the side wall of the third gear is fixedly connected to a third rotating rod, the third rotating rod is rotatably connected to the oil storage tank, the outer wall of the third rotating rod is fixedly connected to a fourth gear, the outer wall of the fourth rotating rod is fixedly connected to a fifth gear, and the fifth gear meshes with the fourth gear.

[0012] As a preferred technical solution for the packaging machine for bearing processing, the second gear and the third gear are both bevel gears, and the transmission ratio of the fourth gear to the fifth gear is 2:1.

[0013] As an optimal technical solution for the packaging machine for bearing processing, it also includes door-shaped plates arranged symmetrically with each other, the oil storage tank is located between the two door-shaped plates, the surface of the oil storage tank is symmetrically fixedly connected with a connecting plate, the surface of the door-shaped plate is installed with a motor, the output end of the motor is fixedly connected with a first screw rod, the outer wall of the first screw rod is fixedly connected with a first sprocket, one side of the first sprocket is connected with a second sprocket through a chain transmission, the surface of the second sprocket is fixedly connected with a second screw rod, the first screw rod and the second screw rod are both rotatably connected to the door-shaped plates, the first screw rod and the second screw rod pass through the corresponding connecting plates, and the first screw rod and the second screw rod are threadedly connected to the corresponding connecting plates.

[0014] A packaging method for a bearing processing packaging machine comprises the following steps:

[0015] Step 1: Cleaning: Spray the cleaning agent on the bearing surface and wipe the bearing surface clean with a sponge, wiping in one direction each time, and then blow dry the remaining cleaning agent on the bearing surface;

[0016] Step 2: Clamping and fixing: fix the bearing at the end of the manipulator;

[0017] Step 3: Oiling: Use oiling equipment to automatically and evenly apply lubricating oil on the bearing surface;

[0018] Step 4: Laminating: Paste the packaging film on the surface of the bearing.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) Fix the bearing between two door-shaped plates, start the motor to drive the first screw to rotate, and through the cooperation between the first sprocket, the chain, and the second sprocket, the second screw rotates. The rotation of the first screw and the second screw drives the connecting plate to move between the two door-shaped plates, thereby moving the oil storage tank. During the movement of the oil storage tank, the lubricating oil in the oil storage tank falls from the oil outlet into the bearing surface. In this process, the stirring roller evenly spreads the lubricating oil on the bearing surface.

[0021] (2) When the oil tank is moving, the ejector pin in contact with the bearing moves toward the oil tank under the resistance of the bearing, so that the baffle plate moves away from the oil outlet hole, and the lubricating oil falls into the bearing surface from the oil outlet hole. The ejector pin that is not in contact with the bearing, under the action of its own gravity and the pressure of the lubricating oil, causes the baffle plate to resist the inner wall of the oil tank, thereby blocking the corresponding oil outlet hole, which can effectively reduce the waste of lubricating oil. At the same time, through the design of the ejector pin, a number of micropores are formed on the surface of the lubricating oil layer, which enhances the adhesion between the lubricating oil and the protective film and improves the pasting quality of the protective film.

[0022] (3) Since the rotating ball contacts the side wall of the bearing, the adjusting plate automatically moves along the outer wall of the bearing during the movement of the oil storage tank. The second rotating rod rotates through the cooperation between the rack and the first gear. The rotation of the second rotating rod drives the second gear to rotate. The rotation of the second gear drives the third gear to rotate. The rotation of the third gear drives the third rotating rod to rotate. The fourth rotating rod rotates through the cooperation between the fourth gear and the fifth gear. The rotation of the fourth rotating rod drives the spiral plate to rotate, so that the lubricating oil in the oil storage tank is in a flowing state during the oiling process, which facilitates the lubricating oil to flow out of the oil outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic diagram of the three-dimensional structure of the oil coating device in the embodiment of the present invention from a first viewing angle;

[0024] Figure 2 Schematic diagram of the oil storage tank structure in an embodiment of the present invention;

[0025] Figure 3 For the present invention Figure 1 A schematic diagram of the structure enlargement at point A;

[0026] Figure 4 A schematic diagram of the three-dimensional structure of the oil coating device in the embodiment of the present invention from a second viewing angle;

[0027] Figure 5 For the present invention Figure 4 A schematic diagram of the structure at B in FIG.

[0028] Figure 6 It is a partial structural schematic diagram of the oil coating equipment in an embodiment of the present invention;

[0029] Figure 7 It is a schematic diagram of the process flow of the present invention.

[0030] Description of the numbers in the figure:

[0031] 1. Oil storage tank; 2. Oil outlet; 3. Agitating roller; 4. First support plate; 5. Limiting plate; 6. Adjusting plate; 7. First rotating rod; 8. Rotating ball; 9. L-shaped plate; 10. Sliding bar; 11. Moving plate; 12. Spring; 13. Groove; 14. Second support plate; 15. Sliding groove; 16. Sliding block; 17. Ejector pin; 18. Baffle plate; 19. Rack; 20. First gear; 21. Second rotating rod; 22. Second gear; 23. Third gear; 24. Third rotating rod; 25. Fourth gear; 26. Fifth gear; 27. Fourth rotating rod; 28. Screw plate; 29. ​​Door plate; 30. Motor; 31. First screw rod; 32. Second screw rod; 33. Connecting plate; 34. First sprocket; 35. Second sprocket; 36. Chain. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] For example, see Figure 1-3, a packaging machine for bearing processing, comprising an oil storage tank 1, a plurality of oil outlet holes 2 are opened at the bottom of the oil storage tank 1, a first support plate 4 is fixedly connected to one side of the oil storage tank 1, an adjusting plate 6 is arranged on the other side of the oil storage tank 1, a stirring roller 3 is rotatably connected to the side of the adjusting plate 6 close to the first support plate 4, the stirring roller 3 is made of soft silicone material, the stirring roller 3 penetrates the first support plate 4, the stirring roller 3 is slidably connected to the first support plate 4, a groove 13 is opened on the side wall of the adjusting plate 6, a first rotating rod 7 is rotatably connected in the groove 13, a rotating ball 8 is fixedly connected to the outer wall of the first rotating rod 7, the rotating ball 8 is in contact with the bearing, an L-shaped plate 9 is fixedly connected to the upper end of the adjusting plate 6, a sliding bar 10 is fixedly connected to the side wall of the L-shaped plate 9, the sliding bar 10 penetrates one side of the oil storage tank 1, the sliding bar 10 is slidably connected to the oil storage tank 1, a spring 12 is arranged between the sliding bar 10 and the oil storage tank 1, and the design of the spring 12 facilitates the movement and automatic reset of the adjusting plate 6.

[0034] See also Figure 4 , and also includes door-shaped plates 29 arranged symmetrically with each other, the oil storage tank 1 is located between the two door-shaped plates 29, and the surface of the oil storage tank 1 is symmetrically fixedly connected with a connecting plate 33, and a motor 30 is installed on the surface of the door-shaped plate 29, and the output end of the motor 30 is fixedly connected with a first screw rod 31, and the outer wall of the first screw rod 31 is fixedly connected with a first sprocket 34, and one side of the first sprocket 34 is connected to a second sprocket 35 through a chain 36. The surface of the second sprocket 35 is fixedly connected with a second screw rod 32, and the first screw rod 31 and the second screw rod 32 are both rotatably connected to the door-shaped plate 29, and the first screw rod 31 and the second screw rod 32 pass through the corresponding connecting plate 33, and the first screw rod 31 and the second screw rod 32 are threadedly connected to the corresponding connecting plate 33.

[0035] In this embodiment:

[0036] The bearing is fixed between the two door-shaped plates 29, and the motor 30 is started to drive the first screw rod 31 to rotate. The rotation of the first screw rod 31 drives the first sprocket 34 to rotate. Under the transmission action of the chain 36, the rotation of the first sprocket 34 drives the second sprocket 35 to rotate. The rotation of the second sprocket 35 drives the second screw rod 32 to rotate. The rotation of the first screw rod 31 and the second screw rod 32 drives the connecting plate 33 to move between the two door-shaped plates 29. The movement of the connecting plate 33 drives the oil storage tank 1 to move. During the movement of the oil storage tank 1, the lubricating oil in the oil storage tank 1 falls into the bearing surface from the oil outlet 2. Since the rotating ball 8 conflicts with the side wall of the bearing, during the movement of the oil storage tank 1, the adjusting plate 6 automatically moves according to the appearance characteristics of the bearing. During this process, the stirring roller 3 evenly spreads the lubricating oil on the bearing surface.

[0037] Embodiment 2: This embodiment is an improvement made on the basis of Embodiment 1. Figure 3 .

[0038] Since the bearing surface is circular, in order to reduce the waste of lubricating oil, an ejector pin 17 is arranged in the oil outlet hole 2, and a baffle plate 18 is fixedly connected to the upper end of the ejector pin 17. The outer diameter of the baffle plate 18 is larger than the inner diameter of the oil outlet hole 2, and the outer diameter of the ejector pin 17 is smaller than the inner diameter of the oil outlet hole 2. When the oil storage tank 1 moves, the ejector pin 17 in contact with the bearing moves toward the oil storage tank 1 under the resistance of the bearing, thereby making the baffle plate 18 away from the oil outlet hole 2, and then making the lubricating oil fall into the bearing surface from the oil outlet hole 2. The ejector pin 17 that is not in contact with the bearing, under the action of its own gravity and the pressure of the lubricating oil, makes the baffle plate 18 resist against the inner wall of the oil storage tank 1, thereby blocking the corresponding oil outlet hole 2, which can effectively reduce the waste of lubricating oil. At the same time, through the design of the ejector pin 17, a number of micropores are formed on the surface of the lubricating oil layer, thereby enhancing the adhesion between the lubricating oil and the protective film, and improving the pasting quality of the protective film.

[0039] Embodiment 3: This embodiment is a supplementary explanation based on Embodiment 1. Figure 5-6 .

[0040] One end of the slide bar 10 away from the L-shaped plate 9 is fixedly connected to a movable plate 11, and a slider 16 is fixedly connected to the bottom of the movable plate 11. The inner wall of the oil storage tank 1 is fixedly connected to a second support plate 14, and a slide groove 15 is opened on the surface of the second support plate 14. The slider 16 is slidably connected in the slide groove 15. The mutual cooperation between the slide groove 15 and the slider 16 facilitates the movement of the slide bar 10, and at the same time, the movement range of the slide bar 10 can be limited.

[0041] One end of the stirring roller 3 away from the adjusting plate 6 is fixedly connected to the limiting plate 5. Through the design of the limiting plate 5, the moving range of the stirring roller 3 is conveniently limited to prevent the stirring roller 3 from completely separating from the first support plate 4 during the movement. One end of the spring 12 is fixedly connected to the moving plate 11, and the other end of the spring 12 is fixedly connected to the oil storage tank 1.

[0042] Embodiment 4: This embodiment is an improvement made on the basis of Embodiment 1. Figure 6 .

[0043] A rack 19 is fixedly connected to the surface of the movable plate 11, and a first gear 20 is arranged in the oil storage tank 1. The first gear 20 and the rack 19 are meshed with each other. The bottom of the first gear 20 is connected to the second gear 22 through a second rotating rod 21. The second rotating rod 21 penetrates the second support plate 14, and the second rotating rod 21 is rotatably connected to the second support plate 14. The bottom of the second gear 22 is connected to a fourth rotating rod 27 through a driven assembly. Both ends of the fourth rotating rod 27 are rotatably connected to the oil storage tank 1, and the outer wall of the fourth rotating rod 27 is fixedly connected to a spiral plate 28.

[0044] The driven assembly includes a third gear 23 meshing with the second gear 22, a third rotating rod 24 is fixedly connected to the side wall of the third gear 23, the third rotating rod 24 is rotatably connected to the oil storage tank 1, a fourth gear 25 is fixedly connected to the outer wall of the third rotating rod 24, a fifth gear 26 is fixedly connected to the outer wall of the fourth rotating rod 27, and the fifth gear 26 meshes with the fourth gear 25.

[0045] The second gear 22 and the third gear 23 are both bevel gears, and the transmission ratio between the fourth gear 25 and the fifth gear 26 is 2:1.

[0046] In this embodiment:

[0047] When the adjusting plate 6 moves along the side wall of the bearing, the moving plate 11 moves, and the movement of the moving plate 11 drives the rack 19 to move, and the movement of the rack 19 drives the first gear 20 to rotate, and the rotation of the first gear 20 drives the second rotating rod 21 to rotate, and the rotation of the second rotating rod 21 drives the second gear 22 to rotate, and the rotation of the second gear 22 drives the third gear 23 to rotate, and the rotation of the third gear 23 drives the third rotating rod 24 to rotate, and the fourth rotating rod 27 rotates through the mutual cooperation between the fourth gear 25 and the fifth gear 26, and the rotation of the fourth rotating rod 27 drives the spiral plate 28 to rotate, so that the lubricating oil in the oil storage tank 1 is in a flowing state during the oiling process, which facilitates the lubricating oil to flow out of the oil outlet 2.

[0048] See also Figure 1 , a packaging method for a bearing processing packaging machine, comprising the following steps:

[0049] Step 1: Cleaning: Spray the cleaning agent on the bearing surface and wipe the bearing surface clean with a sponge, wiping in one direction each time, and then blow dry the remaining cleaning agent on the bearing surface;

[0050] Step 2: Clamping and fixing: fix the bearing at the end of the manipulator;

[0051] Step 3: Oiling: Use oiling equipment to automatically and evenly apply lubricating oil on the bearing surface;

[0052] Step 4: Laminating: Paste the packaging film on the surface of the bearing.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A packaging machine for bearing processing, characterized in that: The invention comprises an oil storage tank (1), characterized in that: a plurality of oil outlet holes (2) are provided at the bottom of the oil storage tank (1); a first support plate (4) is fixedly connected to one side of the oil storage tank (1); an adjustment plate (6) is provided on the other side of the oil storage tank (1); a stirring roller (3) is rotatably connected to the side of the adjustment plate (6) close to the first support plate (4); the stirring roller (3) passes through the first support plate (4); the stirring roller (3) is slidably connected to the first support plate (4); a groove ( 13), a first rotating rod (7) is rotatably connected in the groove (13), a rotating ball (8) is fixedly connected to the outer wall of the first rotating rod (7), the rotating ball (8) is in contact with the bearing, an L-shaped plate (9) is fixedly connected to the upper end of the adjustment plate (6), a sliding bar (10) is fixedly connected to the side wall of the L-shaped plate (9), the sliding bar (10) passes through one side of the oil storage tank (1), the sliding bar (10) is slidably connected to the oil storage tank (1), and a spring (12) is provided between the sliding bar (10) and the oil storage tank (1).

2. A bearing processing packaging machine according to claim 1, characterized in that: An ejector pin (17) is arranged in the oil outlet hole (2), and a baffle plate (18) is fixedly connected to the upper end of the ejector pin (17). The outer diameter of the baffle plate (18) is larger than the inner diameter of the oil outlet hole (2), and the outer diameter of the ejector pin (17) is smaller than the inner diameter of the oil outlet hole (2).

3. The bearing processing packaging machine according to claim 1, characterized in that: The end of the slide bar (10) away from the L-shaped plate (9) is fixedly connected to a movable plate (11), the bottom of the movable plate (11) is fixedly connected to a sliding block (16), the inner wall of the oil storage tank (1) is fixedly connected to a second support plate (14), the surface of the second support plate (14) is provided with a sliding groove (15), and the sliding block (16) is slidably connected in the sliding groove (15).

4. A bearing processing packaging machine according to claim 3, characterized in that: One end of the stirring roller (3) away from the adjustment plate (6) is fixedly connected to the limit plate (5), one end of the spring (12) is fixedly connected to the moving plate (11), and the other end of the spring (12) is fixedly connected to the oil storage tank (1).

5. The bearing processing packaging machine according to claim 3, characterized in that: A rack (19) is fixedly connected to the surface of the movable plate (11); a first gear (20) is arranged in the oil storage tank (1); the first gear (20) and the rack (19) are meshed with each other; the bottom of the first gear (20) is connected to a second gear (22) via a second rotating rod (21); the second rotating rod (21) passes through the second supporting plate (14); the second rotating rod (21) is rotatably connected to the second supporting plate (14); the bottom of the second gear (22) is connected to a fourth rotating rod (27) via a driven component; both ends of the fourth rotating rod (27) are rotatably connected to the oil storage tank (1); and a spiral plate (28) is fixedly connected to the outer wall of the fourth rotating rod (27).

6. A bearing processing packaging machine according to claim 5, characterized in that: The driven assembly comprises a third gear (23) meshing with the second gear (22); a third rotating rod (24) is fixedly connected to a side wall of the third gear (23); the third rotating rod (24) is rotatably connected to the oil storage tank (1); a fourth gear (25) is fixedly connected to an outer wall of the third rotating rod (24); a fifth gear (26) is fixedly connected to an outer wall of the fourth rotating rod (27); the fifth gear (26) meshes with the fourth gear (25).

7. A bearing processing packaging machine according to claim 6, characterized in that: The second gear (22) and the third gear (23) are both bevel gears, and the transmission ratio between the fourth gear (25) and the fifth gear (26) is 2:

1.

8. The bearing processing packaging machine according to claim 1, characterized in that: The invention also comprises door-shaped plates (29) which are arranged symmetrically with each other, the oil storage tank (1) is located between the two door-shaped plates (29), a connecting plate (33) is symmetrically fixedly connected to the surface of the oil storage tank (1), a motor (30) is installed on the surface of the door-shaped plate (29), a first screw rod (31) is fixedly connected to the output end of the motor (30), a first sprocket (34) is fixedly connected to the outer wall of the first screw rod (31), a second sprocket (35) is connected to one side of the first sprocket (34) by a chain (36), a second screw rod (32) is fixedly connected to the surface of the second sprocket (35), the first screw rod (31) and the second screw rod (32) are both rotatably connected to the door-shaped plate (29), the first screw rod (31) and the second screw rod (32) penetrate the corresponding connecting plate (33), and the first screw rod (31) and the second screw rod (32) are threadedly connected to the corresponding connecting plate (33).

9. A packaging method for a bearing processing packaging machine according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: Cleaning: Spray the cleaning agent on the bearing surface and wipe the bearing surface clean with a sponge, wiping in one direction each time, and then blow dry the remaining cleaning agent on the bearing surface; Step 2: Clamping and fixing: fix the bearing at the end of the manipulator; Step 3: Oiling: Use oiling equipment to automatically and evenly apply lubricating oil on the bearing surface; Step 4: Laminating: Paste the packaging film on the surface of the bearing.

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