Self-lubricating retainer for thin-wall bearing of industrial robot

Abstract

The utility model belongs to the technical field of bearings, and particularly relates to a self-lubricating retainer for a thin-wall bearing of an industrial robot, which is characterized by comprising a first retainer body and a second retainer body with the same structure, the first retainer body and the second retainer body are connected through a rivet after being buckled, and the first retainer body and the second retainer body have the same structure and respectively comprise a pocket area and a connecting area. Every two adjacent pocket areas are connected through a connecting area, the multiple pocket areas and the connecting areas are connected to form an annular body, and rivet holes are formed in the connecting areas. The first frame body and / or the second frame body are / is provided with oil containing annular grooves, and the oil containing annular grooves are continuously arranged along the pocket areas and the connecting areas in a penetrating mode. A through hole is formed in the oil containing annular groove of the pocket area. The utility model has the beneficial effects that the lubricating oil continuous flowing channel structure is adopted, so that the rapid flowing of the lubricating oil can be realized, and an excellent lubricating effect is ensured; and the metal retainer is good in heat conductivity, so that local heat can be quickly taken out in time, the bearing is prevented from being damaged due to local overheating, and the problem of local temperature rise of the bearing is favorably solved.

Description

Technical Field

[0001] This utility model belongs to the field of bearing technology, and in particular relates to a self-lubricating cage for thin-walled bearings of industrial robots. Background Technology

[0002] Bearings are essential components in modern machinery. Their main function is to support moving parts, reduce the coefficient of friction during movement, and ensure motion accuracy. Metal linear bearings are a type of low-cost linear motion system. Their sleeve-like structure allows for unlimited stroke and mates with cylindrical shafts. They are widely used in sliding components of industrial machinery such as precision machine tools, textile machinery, food packaging machinery, and printing machinery.

[0003] A bearing cage (also known as a bearing retainer) is a bearing component that partially encloses all or part of the rolling elements and moves with them. It isolates the rolling elements and usually guides and holds them within the bearing. Typically, in addition to its support function, the cage also provides auxiliary lubrication; grease is often injected into the gap between the cage and the balls to keep the bearing lubricated for a period of time.

[0004] Chinese utility model patent application number 201120216810.2 discloses a bearing cage that has both oil storage and lubrication functions. It includes a bearing cage with an oil storage groove formed within the ball bearing groove. While this design allows the oil storage groove to hold a certain volume of lubricating oil, the lubricating oil has poor fluidity, making it prone to overheating and poor lubrication in certain areas.

[0005] Chinese invention patent application number 202111393241.3 discloses a multifunctional glass fiber injection molded bearing cage and its manufacturing method. The bearing cage body is made of glass fiber injection molding and includes ball seats and connecting parts. Several ball seats are connected end-to-end by the connecting parts to form a closed cage. During operation, the balls are mounted on the bearing cage and immersed in the bearing's lubricating medium. When the working shaft rotates on the bearing, it drives the bearing cage and balls to rotate. The closed cage structure formed by the ball seats and connecting parts simplifies the cage structure and reduces its weight. Additionally, the stirring assembly on the arc-shaped rod stirs the lubricating medium during rotation, ensuring sufficient lubrication of the balls on the bearing cage. While this design adds a stirring assembly on the arc-shaped rod to improve lubricant flow, the limited space within the bearing means the stirring assembly further encroaches on the lubricant's storage space and increases its flow resistance, resulting in lower thermal conductivity. In addition, glass fiber is an inorganic non-metallic material with poor thermal conductivity. If local overheating occurs, the heat cannot be transferred out quickly, which is also detrimental to the use of bearings. Utility Model Content

[0006] The purpose of this invention is to provide a self-lubricating cage for thin-walled bearings in industrial robots, overcoming the shortcomings of existing technologies. It employs a continuous flow channel structure for lubricating oil on a metal cage, increasing the storage capacity of the lubricating oil while reducing the resistance to its flow. During bearing operation, the pressure difference caused by the movement of the balls enables rapid flow of the lubricating oil, ensuring effective lubrication while also quickly dissipating localized heat, preventing damage to the bearing due to localized overheating.

[0007] To achieve the above objectives, this utility model employs the following technical solution:

[0008] A self-lubricating retainer for thin-walled bearings in industrial robots includes a first frame and a second frame with identical structures. The first frame and the second frame are fastened together and connected by rivets. The first frame and the second frame have the same structure, each including a pocket area and a connecting area. Adjacent pocket areas are connected by the connecting area, and multiple pocket areas and connecting areas are connected to form a ring. The connecting area is provided with rivet holes. The first frame and / or the second frame are provided with oil-receiving ring grooves, which are continuously provided along each pocket area and connecting area. The oil-receiving ring grooves in the pocket areas are provided with through holes.

[0009] Furthermore, the width of the oil-receiving annular groove is 25-50% of the width of the pocket area.

[0010] Furthermore, the diameter of the through hole is 2-3 mm, and the number of through holes in one pocket area is 2-3.

[0011] Furthermore, there are two rivet holes, which are respectively located on both sides of the oil-receiving ring groove.

[0012] Furthermore, the depth of the oil-containing ring groove is 1.5-3mm, and the surface is smooth and burr-free.

[0013] Furthermore, the frame one and frame two are stamped from 0.6-0.8mm thick brass plates.

[0014] Furthermore, the rivet is a flat-headed or flat-round-headed rivet made of brass.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1) The continuous flow channel structure of lubricating oil is adopted, which increases the storage volume of lubricating oil on the one hand, and reduces the resistance of lubricating oil flow on the other hand. When the bearing is running, the pressure difference driven by the movement of the balls enables the lubricating oil to flow rapidly and ensure excellent lubrication effect.

[0017] 2) The metal cage has good thermal conductivity, which can quickly remove local heat and prevent the bearing from being damaged due to local overheating, thus helping to solve the problem of localized bearing overheating. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of frame one or frame two in the embodiments of this utility model;

[0019] Figure 2 This is a schematic diagram illustrating the application state of an embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the lubricating oil flow state in an embodiment of this utility model.

[0021] In the diagram: 1-Frame 1, 2-Frame 2, 3-Rivet, 4-Pocket area, 5-Connecting area, 6-Rivet hole, 7-Oil ring groove, 8-Through hole, 9-Inner ring, 10-Outer ring, 11-Ball bearing. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0024] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0025] See Figure 1-3This is a schematic diagram of an embodiment of a self-lubricating retainer for thin-walled bearings of an industrial robot according to the present invention. It includes two identical frames, a first frame 1 and a second frame 2, which are connected by rivets 3 after being fastened together. Frames 1 and 2 have the same structure, each including a pocket area 4 and a connecting area 5. Adjacent pocket areas 4 are connected by the connecting area 5, and multiple pocket areas 4 and connecting areas 5 are connected to form a ring. The connecting area 5 has rivet holes 6. Frames 1 and / or 2 have oil-receiving ring grooves 7, which are continuously provided along each pocket area 4 and connecting area 5. The oil-receiving ring grooves 7 in the pocket areas 4 have through holes 8. There are two rivet holes 6, respectively located on both sides of the oil-receiving ring groove 7. The depth of the oil-receiving ring groove 7 is 1.5-3mm, preferably 2mm, and the surface is polished smooth without burrs.

[0026] The width of the oil-receiving ring groove 7 is 25-50% of the width of the pocket 4, preferably 33%. The diameter of the through hole 8 is 2-3 mm, and there are 2-3 through holes 8 in one pocket 4. For bearings with ball diameters less than 3 mm, the through hole diameter is 2 mm, and there is one through hole. For bearings with ball diameters between 3-5 mm, the through hole diameter is 3 mm, and there are 2-3 through holes.

[0027] In this embodiment, frame 1 and frame 2 are stamped from 0.6-0.8mm thick brass sheets. Stamped brass cages are widely used in small and medium-sized bearings, offering good formability and moderate weight, making them an ideal choice for such bearings. Rivet 3 is a flat-head or flat-round-head brass rivet, which offers the advantage of moderate hardness, preventing damage to the frame during riveting.

[0028] Before using this embodiment of the invention, machine grease can be applied to the oil ring groove 7, then the balls 11 are filled into the pocket area, the first frame 1 and the second frame 2 are fastened together and fixed with rivets 3, and then the cage is placed between the inner ring 9 and the outer ring 10 to complete the bearing assembly. During normal use, part of the mechanical energy of the bearing is converted into heat energy, causing the bearing to heat up. The machine grease is melted into liquid. As the balls 11 rotate within the cage and revolve around the inner ring, the machine grease in the pocket area is squeezed out from the gap between the cage and the outer and inner rings. The loss of grease in the pocket area creates a local negative pressure. At this time, the machine grease on the outside of the cage is replenished through the through hole 8, thereby forming an effective flow of machine grease, ensuring the lubrication effect. At the same time, the flow of machine grease can help to distribute local heat to the entire bearing, thereby avoiding damage due to local overheating.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An industrial robot thin-walled bearing self-lubricating cage, characterized by, The rack body one and the rack body two are connected by rivets after buckling, and the rack body one and the rack body two are the same in structure and comprise a pocket area and a connecting area, two adjacent pocket areas are connected by the connecting area, a plurality of pocket areas and connecting areas are connected to form an annular body, and a rivet hole is arranged on the connecting area; an oil containing ring groove is arranged on the rack body one and / or the rack body two, and the oil containing ring groove is arranged continuously through each pocket area and the connecting area; and a through hole is arranged on the oil containing ring groove of the pocket area.

2. A thin-walled bearing cage for an industrial robot according to claim 1, characterized in that The width of the oil containing ring groove is 25-50% of the width of the pocket area.

3. An industrial robot thin wall bearing self-lubricating cage according to claim 1, characterized in that, The diameter of the through hole is 2-3 mm, and the number of the through holes in one pocket area is 2-3.

4. An industrial robot thin wall bearing self-lubricating cage according to claim 1, characterized in that, The rivet hole is two, and is arranged on both sides of the oil containing ring groove.

5. An industrial robot thin wall bearing self-lubricating cage according to claim 1, characterized in that, The depth of the oil containing ring groove is 1.5-3 mm, and the surface is smooth without burrs.

6. An industrial robot thin wall bearing self-lubricating cage according to claim 1, characterized in that, The rack body one and the rack body two are punched from a 0.6-0.8 mm thick brass plate.

7. An industrial robot thin wall bearing self-lubricating cage according to claim 1, characterized in that, The rivet is a flat head or a flat round head rivet made of brass.

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