Rolling bearing unit and method for manufacturing the same

Abstract

The present invention discloses a rolling bearing unit and a manufacturing method thereof. The rolling bearing unit includes a base body and a plurality of rolling elements disposed in the base body and capable of rolling along a circular groove cavity in the base body. One side of the circular groove cavity has a window. The base body is composed of an upper base body and a lower base body that are fixedly joined together up and down. The surfaces of the upper base body and the lower base body that are butt-jointed are respectively provided with first and second circular groove bodies with a semicircular cross-section. After the first and second circular groove bodies are butt-jointed, a long circular groove cavity is formed. Moreover, a first opening on one side of the first circular groove body and a second opening on one side of the second circular groove body are butt-jointed to form a window, and part of the rolling element is exposed outside the window. In the present invention, the structure of the base body is simple. It is only a two-piece structure with few parts, easy to process, convenient to assemble, low in cost, convenient to manufacture, and more convenient to adjust. Since the base body is composed of an upper base body and a lower base body that are fixedly joined together up and down, it is convenient to design the circular groove cavity and the window, which can further reduce the manufacturing cost, simplify the manufacturing process, and optimize the manufacturing process.

Description

Technical Field:

[0001] The present invention relates to the technical field of guiding and driving, and particularly to a rolling bearing unit and a manufacturing method thereof. The rolling bearing unit is used for guiding and driving a sliding table, and a typical representative thereof is an integrated beam-rail linear motor. Background Art:

[0002] In the processing and manufacturing industry, with the increase in labor costs and the progress of science and technology, automated processing equipment has been increasingly favored by people, and linear motor products have been widely used in the field of automation.

[0003] A linear motor is a transmission device that directly converts electrical energy into mechanical energy of linear motion by expanding a closed magnetic field into an open magnetic field without any intermediate conversion mechanism. Simply put, a linear motor is an expanded rotary servo motor. For a rotating induction motor, imagine cutting it along the radial direction and unfolding the stator and rotor circumferences into a straight line, and this will obtain the simplest iron-core linear induction motor.

[0004] As an important part of a linear motor, a Chinese patent application with the publication number CN111917272A discloses a linear motor sliding table. The sliding table mainly consists of a slide rail and a slide seat. A flat linear motor stator is integrated on the slide rail, and a flat linear motor mover is integrated on the slide seat. The slide seat reciprocates on the slide rail through the electromagnetic force between the mover and the stator. There is a slide seat body on the slide seat. The slide seat body is of an n-shaped groove structure. A slide seat body raceway is designed at a position opposite to the raceway of the slide rail body on the outer side of the slide seat body. A number of steel balls are provided between the slide seat body raceway and the slide rail body raceway. Two through holes are designed at positions opposite to the slide seat body raceway inside both sides of the slide seat body. Slide seat body threaded holes are provided at both ends of the slide seat body. The slide seat body is connected to a steel ball reversing device through the slide seat body threaded holes, and the steel balls make infinite cyclic rolling between the slide seat body raceway, the steel ball reversing device, and the through holes.

[0005] That is to say, the slide body and the two steel ball reversing devices respectively arranged on both sides of the slide body serve as a base, and the base cooperates with a plurality of steel balls to form a rolling bearing unit. Therefore, the base of the rolling bearing unit in the above linear motor slide adopts a simple three-section structure of front, middle and rear, wherein the slide body located in the middle is provided with a through hole and the slide body raceway located on the outside, and the through hole is designed in parallel with the slide body raceway, and the two steel ball reversing devices are both provided with a C-shaped or U-shaped reverse rotation hole for the steel balls to pass through, and thereby realize reverse operation (i.e., turning from the through hole to the slide body raceway). The above rolling bearing unit has a complex structure and a large number of parts, especially the front, middle and rear three sections of raceways and the bearing surface, which are objectively difficult to process and have limited precision improvement, and are not convenient to install, especially in that it is extremely troublesome to set a C-shaped or U-shaped reverse rotation hole in the steel ball reversing device, so the structure also has limited processing precision and increases the production cost of the rolling bearing unit.

[0006] In view of this, the inventor proposes the following technical solution. Summary of the invention:

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a rolling bearing unit and a method for manufacturing the same. The rolling bearing unit has a simple structure, is easy to process, is convenient to install, and has a low manufacturing cost.

[0008] In order to solve the above technical problems, the present invention adopts the following first technical solution: the rolling bearing unit includes a base and a plurality of rolling bodies arranged in the base and capable of rolling along a spiral groove cavity in the base, one side of the spiral groove cavity has a window for accommodating partial exposure of the rolling body, and the base is composed of an upper base and a lower base fixed together; the docking surfaces of the upper base and the lower base are respectively provided with a first spiral groove body and a second spiral groove body with a semicircular cross-section, and the first spiral groove body and the second spiral groove body are docked to form the oblong spiral groove cavity; and the window is formed after the first opening on one side of the first spiral groove body is docked with the second opening on one side of the second spiral groove body.

[0009] Furthermore, in the above technical solution, the upper substrate and the lower substrate are both integrally formed of metal or metal oxide material; the inner wall of the vortex groove cavity is provided with a polymer functional layer for sound insulation and noise reduction, and the rolling body is in contact with the polymer functional layer; wherein the polymer functional layer is a coating, which is applied to the inner wall of the vortex groove cavity; or, the polymer functional layer is a pipe fitting, which is embedded and fixed to the inner wall of the vortex groove cavity.

[0010] Furthermore, in the above technical solution, the upper substrate and the lower substrate are both integrally formed of a polymer composite material; a hard inlaid shell is provided at the first opening of the first gyratory trough body and the second opening of the second gyratory trough body.

[0011] Furthermore, in the above technical solution, a first lip is formed at the edge of the first opening of the first turning groove body, and a second lip is formed at the edge of the second opening of the second turning groove body. The second lip is located below the first lip, and the first lip and the second lip cooperate to restrict the rolling elements to rotate within the turning groove cavity. There is a spacer between the rolling elements, and the spacer separates the rolling elements. Among them, the spacer is a flexible noise-reducing segmented chain structure.

[0012] To solve the above technical problems, the present invention adopts the following second technical solution: The rolling bearing unit includes a base body and a plurality of rolling elements disposed within the base body and capable of rolling along the turning groove cavity within the base body. One side of the turning groove cavity has a window that can accommodate a partial exposure of the rolling elements. The base body is composed of an upper base body, a middle base body, and a lower base body that are sequentially fixed together from top to bottom. A first turning groove body with a semicircular cross-section is provided on the lower end surface of the upper base body. A second turning groove body with a semicircular cross-section is provided on the upper end surface of the lower base body. A third turning groove body with a semicircular cross-section is provided on the upper end surface of the middle base body. The third turning groove body and the first turning groove body are butted to form the first turning groove cavity. The first opening on one side of the first turning groove body and the third opening on one side of the third turning groove body are butted to form the first window. The rolling elements within the first turning groove cavity partially protrude outside the first window. A fourth turning groove body with a semicircular cross-section is provided on the lower end surface of the middle base body. The fourth turning groove body and the second turning groove body are butted to form the second turning groove cavity. The second opening on one side of the second turning groove body and the fourth opening on one side of the fourth turning groove body are butted to form the second window. The rolling elements within the second turning groove cavity partially protrude outside the second window.

[0013] To solve the above technical problems, the present invention adopts the following third technical solution: The rolling bearing unit includes a base body and a plurality of rolling elements disposed within the base body and capable of rolling along the turning groove cavity within the base body. The base body is composed of a left base body and a right base body that are butted and fixed together. A ring-shaped turning groove cavity is formed between the left base body and the right base body. A convex seat that protrudes outward and is trapezoidal is formed at the lower end of the surface where the left base body and the right base body are butted. The right base body is provided with a fifth opening that penetrates the front and rear end surfaces. The convex seat is embedded in the fifth opening and exposed on the front end surface of the right base body. The turning groove cavity also communicates with the front end surface of the convex seat, so that several rolling elements are exposed on the front end surface of the convex seat, and all the rolling elements form a non-coplanar rolling chain.

[0014] Furthermore, in the above technical solution, the surfaces of the left base body and the right base body that are butt-jointed are respectively provided with a third swirling groove body and a fourth swirling groove body with a semi-circular cross-section. Among them, the third swirling groove body includes a first C-shaped groove formed on the surface where the left base body and the right base body are butt-jointed, a first inclined groove and a second inclined groove connected to both ends of the first C-shaped groove and respectively located on both side surfaces of the convex seat, and a first horizontal groove connected between the first inclined groove and the second inclined groove and distributed on the front end surface of the convex seat; the fourth swirling groove body includes a second C-shaped groove formed on the surface where the right base body and the left base body are butt-jointed, a third inclined groove and a fourth inclined groove connected to both ends of the second C-shaped groove and communicating with the fifth opening; the first C-shaped groove, the first inclined groove and the second inclined groove are respectively butted with the second C-shaped groove, the third inclined groove and the fourth inclined groove, and the third inclined groove and the fourth inclined groove respectively communicate with both ends of the first horizontal groove, and the convex seat is exposed in the fifth opening, so as to form a swirling groove cavity in an L-shaped ring; third lips are formed on both upper and lower edges of the first horizontal groove.

[0015] To solve the above technical problems, the present invention adopts the following fourth technical solution: The manufacturing method of the rolling bearing unit includes the following steps:

[0016] S001: Manufacturing the lower base body: Embedding a metal nut into an injection mold, injecting molten polymer composite material into the injection mold by the injection mold, and cooling to form a lower base body with a metal nut. The upper end surface of the lower base body has a second swirling groove body with a semi-circular cross-section and a second opening located on one side of the second swirling groove body, and a second inlay groove is provided in a section of the second swirling groove body corresponding to the second opening;

[0017] S002: Manufacturing the upper base body: Turning the above-mentioned lower base body by 180° as the upper base body; that is, the lower end of the upper base body has a first swirling groove body with a semi-circular cross-section and a first opening located on one side of the first swirling groove body; and a first inlay groove is provided in a section of the first swirling groove body corresponding to the first opening;

[0018] S003: Manufacturing the hard inlay shell: Using an automated device to draw an inlay tube blank from a metal material and divide and form it into a hard inlay shell, or precision pressing a hard inlay shell from a metal or metal oxide material, and at the same time grinding and polishing the load surface of the hard inlay shell;

[0019] S004: Manufacturing the rolling elements: Making the rolling elements from a metal or metal oxide material;

[0020] S005: Assembly of the rolling bearing unit: Fit the hard inlay shell into the second inlay groove of the lower base body, place a plurality of rolling elements in the second revolving groove body of the lower base body and the hard inlay shell, cover the upper base body, and fix it with screws and metal nuts to form the base body. The second revolving groove body is docked with the first revolving groove body and the hard inlay shell to form an annular revolving groove cavity for the rolling elements to move. The first opening, the second opening and the hard inlay shell are docked to form a window that can accommodate partial exposure of the rolling elements, and the rolling elements are partially exposed outside the window to make the rolling unit. Or, assemble a plurality of rolling elements in the noise reduction segmented chain in a rollable manner, then place the noise reduction segmented chain in the second revolving groove body of the lower base body and the hard inlay shell, cover the upper base body, and fix it with screws and metal nuts to form the base body. The second revolving groove body is docked with the first revolving groove body and the hard inlay shell to form an annular revolving groove cavity for the rolling elements to move. The first opening, the second opening and the hard inlay shell are docked to form a window that can accommodate partial exposure of the rolling elements, and the rolling elements are partially exposed outside the window to make the rolling bearing unit.

[0021] To solve the above technical problems, the present invention adopts the following fifth technical solution: The manufacturing method of the rolling bearing unit includes the following steps:

[0022] S001: Manufacture the lower base body: Use high-pressure precision molding of metal powder to manufacture the lower base body, tap the lower base body to form screw holes, and then perform grinding to form a second revolving groove body with a semicircular cross-section on the upper end face of the lower base body and a second opening on one side of the second revolving groove body. Then, polish the outer shape of the lower base body and the rear walls of the second revolving groove body and the second opening with a polishing device.

[0023] S002: Manufacture a polymer functional layer for noise reduction. Spray a layer of polymer composite material on the inner wall of the second revolving groove body to form the polymer functional layer, and grind and polish the polymer functional layer.

[0024] S003: Manufacture the upper base body: Turn the above-mentioned lower base body 180° to be used as the upper base body. That is, the lower end of the upper base body has a first revolving groove body with a semicircular cross-section and a first opening on one side of the first revolving groove body.

[0025] S004: Manufacture the rolling elements: The rolling elements are made of metal or metal oxide materials.

[0026] S005: Place multiple rolling elements on the polymer functional layer on the inner wall of the second revolving groove in the lower base body, cover the upper base body, and form a base body after fixing with screws through screw holes. The second revolving groove is docked with the first revolving groove to form a revolving groove cavity for the rolling elements to move and in a ring shape, and the first opening and the second opening are docked to form a window that can accommodate partial exposure of the rolling elements, thus making a rolling bearing unit; or, assemble multiple rolling elements in a noise-reducing segmented chain in a rollable manner, then place the noise-reducing segmented chain in the second revolving groove of the lower base body, cover the upper base body, and form a base body after fixing with screws through screw holes. The second revolving groove is docked with the first revolving groove to form a revolving groove cavity for the rolling elements to move and in a ring shape, and the first opening and the second opening are docked to form a window that can accommodate partial exposure of the rolling elements, thus making a rolling bearing unit.

[0027] To solve the above technical problems, the present invention adopts the following sixth technical solution: The manufacturing method of the rolling bearing unit includes the following steps:

[0028] S001: Manufacture the lower base body: High-pressure precision form the lower base body with metal powder, tap the lower base body to form screw holes, and then perform grinding processing to form a second revolving groove with a semi-circular cross-section on the upper end face of the lower base body and a second opening located on one side of the second revolving groove; then polish the outer shape of the lower base body, the second revolving groove, and the second opening with a polishing device.

[0029] S002: Manufacture the polymer functional layer for noise reduction. First, use a polymer composite material to form a thin-walled pipe fitting through an injection molding device, and fix the thin-walled pipe fitting in the inner wall of the second revolving groove by inlaying to form a polymer functional layer on the inner wall of the second revolving groove.

[0030] S003: Manufacture the upper base body: Flip the above-mentioned lower base body by 180° as the upper base body; that is, the lower end of the upper base body has a first revolving groove with a semi-circular cross-section and a first opening located on one side of the first revolving groove.

[0031] S004: Manufacture the rolling elements: Make the rolling elements with metal or metal oxide materials.

[0032] S005: Place multiple rolling elements on the polymer functional layer on the inner wall of the second revolving groove in the lower base body, cover the upper base body, and form the base body after fixing with screws through screw holes. The second revolving groove is docked with the first revolving groove to form a revolving groove cavity for the rolling elements to move and in a ring shape, and the first opening and the second opening are docked to form a window for accommodating partial exposure of the rolling elements, thus manufacturing a rolling bearing unit. Or, assemble multiple rolling elements in a rollable manner in a noise-reducing segmented chain, then place the noise-reducing segmented chain in the second revolving groove of the lower base body, cover the upper base body, and form the base body after fixing with screws through screw holes. The second revolving groove is docked with the first revolving groove to form a revolving groove cavity for the rolling elements to move and in a ring shape, and the first opening and the second opening are docked to form a window for accommodating partial exposure of the rolling elements, thus manufacturing a rolling bearing unit.

[0033] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The structure of the base body in the present invention is simple. It is only a two-piece structure with few parts, easy to process, convenient to assemble, and low in cost. In addition, since the base body is composed of an upper base body and a lower base body fixed together by upper and lower mating, it is convenient to design the revolving groove cavity and the window, especially convenient to design the internal details of the revolving groove cavity such as the force-bearing contact section, oil groove, dirt groove, and hardened force-bearing area and wear reduction and noise elimination, which can further reduce the manufacturing cost and simplify the manufacturing process, making the present invention highly competitive in the market. Description of the Drawings:

[0034] Figure 1 is a three-dimensional view of the present invention;

[0035] Figure 2 is a three-dimensional view of another perspective of the present invention;

[0036] Figure 3 is a cross-sectional view of the present invention;

[0037] Figure 4 is an exploded three-dimensional view of the present invention;

[0038] Figure 5 is a three-dimensional view of the upper base body in the present invention;

[0039] Figure 6 is an assembly drawing of the lower base body, polymer functional layer and rolling elements in the present invention;

[0040] Figure 7 is an assembly drawing of the upper base body and polymer functional layer in the present invention;

[0041] Figure 8 is a process flow chart of the manufacturing method of the first rolling bearing unit in the present invention;

[0042] Figure 9It is the process flow diagram of the manufacturing method of the second rolling bearing unit in the present invention;

[0043] Figure 10 It is the process flow diagram of the manufacturing method of the third rolling bearing unit in the present invention;

[0044] Figure 11 It is the assembly drawing of the flexible noise-reducing segmented chain structure and the cylindrical rolling elements in the present invention;

[0045] Figure 12 It is the assembly drawing of the flexible noise-reducing segmented chain structure and the spherical rolling elements in the present invention;

[0046] Figure 13 It is the structural diagram of the rolling bearing unit of the present invention equipped with the upper half tube body and the lower half tube body;

[0047] Figure 14 It is the structural diagram of the rolling bearing unit of the present invention equipped with the hard inlay shell;

[0048] Figure 15 It is the three-dimensional view of another structure of the rolling bearing unit of the present invention;

[0049] Figure 16 It is Figure 15 the sectional view of;

[0050] Figure 17 It is Figure 15 the exploded view of.

[0051] Figure 18 It is the three-dimensional view of the third structure of the rolling bearing unit of the present invention;

[0052] Figure 19 It is the three-dimensional exploded view of the third structure of the rolling bearing unit of the present invention;

[0053] Figure 20 It is the sectional view of the third structure of the rolling bearing unit of the present invention;

[0054] Figure 21 It is the three-dimensional view of the non-coplanar rolling chain in the third structure of the rolling bearing unit of the present invention;

[0055] Figure 22 It is the three-dimensional view of the right base body in the third structure of the rolling bearing unit of the present invention;

[0056] Figure 23 It is the left view of the non-coplanar rolling chain in the third structure of the rolling bearing unit of the present invention;

[0057] Figure 24 It is the usage state diagram of the third structure of the rolling bearing unit of the present invention. Specific embodiments:

[0058] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0059] As shown in Figure 1-7 Figure, there is a rolling bearing unit, which is used for guiding the driving of a slide table. A typical example is used to manufacture a beam-rail integrated linear motor.

[0060] The rolling bearing unit includes a base body 1 and a plurality of rolling elements 2 disposed within the base body 1 and capable of rolling along a circumferential groove cavity 100 within the base body 1. One side of the circumferential groove cavity 100 has a window 200 capable of accommodating a partial exposure of the rolling element 2. Among them, the plurality of rolling elements 2 form a rolling element chain to rotate / roll within the circumferential groove cavity 100, and a part of the rolling element 2 is exposed outside the window 200 to form a rollable contact with an object, thereby reducing friction and improving the running speed and smoothness.

[0061] The base body 1 is composed of an upper base body 11 and a lower base body 12 that are fixedly joined together up and down. That is, the base body 1 in the present invention is a two-piece structure, namely the upper base body 11 and the lower base body 12, and the upper base body 11 and the lower base body 12 are fixedly joined together up and down and locked by screws 10 to form a complete base body, which has few parts, a simple structure, convenient installation, and low cost.

[0062] Furthermore, the base body 1 is formed by the upper base body 11 and the lower base body 12 which are fixedly combined up and down. Its greater advantage is that it is convenient to design the swirl cavity 100, especially convenient to design the internal details of the swirl cavity such as the force-bearing contact section, oil groove, dirt groove, hardened force-bearing area, wear reduction and noise elimination, etc. Specifically, the surfaces of the upper base body 11 and the lower base body 12 that are butted are respectively provided with a first swirl groove body 111 and a second swirl groove body 121 with a semi-circular cross-section. After the first swirl groove body 111 and the second swirl groove body 121 are butted, the oval-shaped swirl cavity 100 is formed; and the first opening 112 on one side of the first swirl groove body 111 and the second opening 122 on one side of the second swirl groove body 121 are butted to form the window 200. Among them, the first swirl groove body 111 has a semi-circular cross-section and is oval-shaped as a whole, so that the first swirl groove body 111 can be directly arranged on the lower end surface of the upper base body 11, and its design / arrangement is very simple. Similarly, the second swirl groove body 121 has a semi-circular cross-section and is oval-shaped as a whole, so that the second swirl groove body 121 can be directly arranged on the upper end surface of the lower base body 12, and its design / arrangement is very simple. So that after the upper base body 11 and the lower base body 12 are fixedly combined in an up-and-down butting manner later, an oval-shaped swirl cavity 100 is formed, and the cross-section of the swirl cavity 100 is circular. To sum up, the structure of the base body 1 in the present invention is simple. It is only a two-piece structure, with few parts, easy to process, convenient to assemble, and low in cost. In addition, since the base body 1 is composed of the upper base body 11 and the lower base body 12 which are fixedly combined up and down, it is convenient to design the swirl cavity 100 and the window 200, which can further reduce the production cost and simplify the production process, making the present invention have extremely strong market competitiveness.

[0063] The structures, shapes and sizes of the upper base body 11 and the lower base body 12 are the same, and they are of a symmetrical structure, making the base body 1 in the present invention only one kind of part, namely the upper base body 11 or the lower base body 12. That is, the upper base body 11 and the lower base body 12 can be used interchangeably, which is convenient for replacement and use, so that the production of the present invention is more simple and the cost is lower. Only one set of molds needs to be opened to make the upper base body 11 or the lower base body 12, and it is more convenient to use, with stronger market competitiveness.

[0064] One side of the base body 1 is also provided with a first anti-slip guide portion 101 and a second anti-slip guide portion 102 protruding outward, and the first anti-slip guide portion 101 and the second anti-slip guide portion 102 are distributed on both sides of the window 200. The cross-sections of the first anti-slip guide portion 101 and the second anti-slip guide portion 102 are both semicircular, and the outer surface of the portion of the rolling body 2 after passing through the window 200 also protrudes outside the first anti-slip guide portion 101 and the second anti-slip guide portion 102. When the rolling body 2 is installed in the slide rail groove, the first anti-slip guide portion 101 and the second anti-slip guide portion 102 will not contact the inner wall of the slide rail groove. Only when the entire rolling bearing unit is subjected to excessive force, the first anti-slip guide portion 101 and the second anti-slip guide portion 102 may contact the inner wall of the slide rail groove, thereby enhancing the bearing capacity and preventing derailment.

[0065] The upper substrate 11 and the lower substrate 12 can be made of different materials, as follows:

[0066] The first type: the upper substrate 11 and the lower substrate 12 are both integrally formed of metal or metal oxide material. Preferably, the upper substrate 11 and the lower substrate 12 are both made of stainless steel.

[0067] In order to reduce the large noise generated by the rolling body 2 in the whirlpool groove cavity 100, the present invention provides a polymer functional layer 3 for silencing and noise reduction on the inner wall of the whirlpool groove cavity 100, and the rolling body 2 is in contact with the polymer functional layer 3. Since the polymer functional layer 3 is a non-rigid material and a soft layer, the rolling body 2 and the polymer functional layer 3 are in rolling contact, so that the function of silencing and noise reduction can be effectively achieved. Among them, the design of the polymer functional layer 3 does not affect the normal use of the window 200, that is, the polymer functional layer 3 will not cover or block the window 200, ensuring the normal use of the window 200.

[0068] At present, polymer composite materials include many types such as plastics, rubber, fiber, film, adhesive and coating, among which plastic, synthetic rubber and synthetic fiber are called the three major modern polymer composite materials. They are light in texture, rich in raw materials, easy to process, good in performance and widely used, so their development speed has greatly surpassed the three traditional basic materials.

[0069] The polymer functional layer 3 is a coating, i.e., a polymer composite coating, which is coated on the inner wall of the whirlpool trough cavity 100. Alternatively, the polymer functional layer 3 is a pipe, i.e., a polymer composite pipe, which is embedded and fixed on the inner wall of the whirlpool trough cavity 100. The pipe is C-shaped, and a gap is formed at the position corresponding to the window 200. Figure 13As shown, the pipe fitting includes an upper half tube body 301 and a lower half tube body 302 formed by dividing in half, and the upper half tube body 301 and the lower half tube body 302 are respectively embedded and fixed in the first gyroscopic trough body 111 and the second gyroscopic trough body 121. When the upper substrate 11 and the lower substrate 12 are fixed together in an up-down manner, the upper half tube body and the lower half tube body are docked to form a complete pipe fitting. Of course, the pipe fitting can also be an integrated structure. This embodiment is a preferred embodiment, and the scheme adopted is that the polymer functional layer 3 is a coating, which is applied to the inner wall of the gyroscopic trough cavity 100. It is simple to set up, and the structure is more stable and not easy to fall off. Among them, the thickness of the coating is 0.01-1mm.

[0070] The second type: the upper substrate 11 and the lower substrate 12 are integrally formed of a polymer composite material, so that the upper substrate 11 and the lower substrate 12 themselves have the effect of silencing and reducing noise, so that there is no need to add the above-mentioned polymer functional layer to the inner wall of the vortex groove cavity 100.

[0071] In order to ensure the strength of the gyratory groove cavity 100 at the window 200, it is avoided that the rolling body 2 is squeezed and cracked due to contact with the outside.

[0072] A hard inlaid shell 1010 is provided at the first opening 112 of the first gyratory trough 111 and at the second opening 122 of the second gyratory trough 121. Figure 14 As shown, the load surface of the hard inlaid shell 1010 is smoothly connected with the first gyroscopic groove body 111 and the second gyroscopic groove body 121, and the strength of the entire window 200 can be increased, thereby avoiding the phenomenon of extrusion and cracking caused by the contact between the rolling body 2 and the outside world, and improving the service life of the product. Wherein, the hard inlaid shell 1010 is integrally formed of metal or metal oxide material. Preferably, the hard inlaid shell 1010 is made of stainless steel. Furthermore, the hard inlaid shell 1010 is made of high-hardness stainless steel, which has greater strength and longer service life.

[0073] In order to prevent the rolling body 2 from falling out of the swirling groove cavity 100, the following design is also made: the first swirling groove body 111 is formed with a first lip body 110 at the edge of the first opening 112, and correspondingly, the second swirling groove body 121 is formed with a second lip body 120 at the edge of the second opening 122, the second lip body 120 is placed below the first lip body 110, and the first lip body 110 and the second lip body 120 cooperate to constrain the rolling body 2 to rotate in the swirling groove cavity 100. Among them, the distance between the second lip body 120 and the first lip body 110 is smaller than the diameter of the rolling body 2, so that the rolling body 2 can be effectively prevented from accidentally falling out and the rolling body 2 can be constrained to rotate in the swirling groove cavity 100.

[0074] The rolling body 2 is integrally formed of metal or metal oxide material. Preferably, the rolling body 2 is made of stainless steel, such as a steel ball or a stainless steel cylinder.

[0075] There is a spacer 4 between the rolling elements 2, which separates the rolling elements 2 to avoid direct contact between the rolling elements 2, thereby reducing the collision friction between the rolling elements, reducing wear, maintaining accuracy and reducing noise. The spacer 4 is a flexible noise reduction segmentation chain structure, i.e., a retainer, combined with Figure 12 As shown, the isolating member 4 has a plurality of connected frames, each of which has a spherical cavity, and the spherical rolling body 2 is placed in the spherical cavity and can move in the spherical cavity, and the rolling body 2 partially protrudes out of the frame. Figure 11 As shown, the rolling body 2 is a cylindrical body, which is rotatably installed inside the flexible noise reduction segmentation chain structure through a rotating shaft. The cylindrical rolling body partially protrudes outside the flexible noise reduction segmentation chain structure to contact the inner wall of the spiral groove cavity 100.

[0076] In summary, the structure of the base 1 in the present invention is simple, it is only a two-piece structure, it has few parts, is easy to process, convenient to assemble, and has low cost. In addition, since the base 1 is composed of an upper base 11 and a lower base 12 that are fixed together, it is convenient to design the convoluted groove cavity 100 and the window 200, which can further reduce the production cost and simplify the production process, making the present invention extremely competitive in the market.

[0077] Combination Figure 8 As shown, the present invention also discloses a first method for manufacturing a rolling bearing unit, the manufacturing method comprising the following steps:

[0078] S001: manufacturing the lower base 12: embedding the metal nut into the injection mold, and injecting the polymer composite material into the injection mold after melting, and forming the lower base 12 with the metal nut after cooling, wherein the upper end surface of the lower base 12 has a second spiral groove 121 with a semicircular cross section and a second opening 122 located at one side of the second spiral groove 121, and a section of the second spiral groove 121 corresponding to the second opening 122 has a second inlay groove 123;

[0079] S002: Making the upper substrate 11: Flipping the lower substrate 12 by 180° to form the upper substrate 11; that is, the lower end of the upper substrate 11 has a first spiral groove 111 with a semicircular cross section and a first opening 112 located on one side of the first spiral groove 111; and a section of the first spiral groove 111 corresponding to the first opening 112 has a first inlay groove 113;

[0080] S003: Manufacturing the hard inlay shell 1010: The inlay body tube blank is drawn from a metal material by an automated device and divided and formed into the hard inlay shell 1010, or the hard inlay shell 1010 is precision molded by pressing a metal or metal oxide material. At the same time, the load surface of the hard inlay shell 1010 is ground and polished. Finally;

[0081] S004: Manufacturing the rolling elements: The rolling elements 2 are made of a metal or metal oxide material;

[0082] S005: Assembly of the rolling bearing unit: As shown in Figure 14 , the hard inlay shell 1010 is installed in the second inlay groove 123 of the lower base 12. A plurality of rolling elements 2 are placed in the second revolving groove body 121 of the lower base 12 and the hard inlay shell 1010, and the upper base 11 is covered. After being fixed by screws and metal nuts, the base 1 is formed. The second revolving groove body 121, the first revolving groove body 111 and the hard inlay shell 1010 are butted to form a revolving groove cavity 100 for the rolling elements 2 to move and in a ring shape. The first opening 112, the second opening 122 and the hard inlay shell 1010 are butted to form a window 200 that can accommodate partial exposure of the rolling elements 2, and the rolling elements 2 are partially exposed outside the window 200 to form a rolling unit; or a plurality of rolling elements 2 are assembled in the noise reduction segmented chain in a rollable manner, and then the noise reduction segmented chain is placed in the second revolving groove body 121 of the lower base 12 and the hard inlay shell 1010, and the upper base 11 is covered. After being fixed by screws and metal nuts, the base 1 is formed. The second revolving groove body 121, the first revolving groove body 111 and the hard inlay shell 1010 are butted to form a revolving groove cavity 100 for the rolling elements 2 to move and in a ring shape. The first opening 112, the second opening 122 and the hard inlay shell 1010 are butted to form a window 200 that can accommodate partial exposure of the rolling elements 2, and the rolling elements 2 are partially exposed outside the window 200 to form a rolling bearing unit.

[0083] The manufacturing method of the first rolling bearing unit described above is extremely simple. When manufacturing the base body 1, only the lower base body 12 needs to be manufactured. That is, the upper base body 11 and the lower base body 12 can be used interchangeably, making the manufacturing easier, reducing the process / method steps, having a lower cost, and only one set of molds is required to manufacture the upper base body 11 or the lower base body 12, which is more convenient to use. The manufacturing method of the first rolling bearing unit uses a polymer composite material to form the upper base body 11 and the lower base body 12, so that the upper base body 11 and the lower base body 12 themselves have the effect of noise reduction, so that there is no need to additionally provide a noise reduction structure on the inner wall of the swirling groove cavity 100, making the product structure simpler and the manufacturing process / method steps fewer. In addition, the manufacturing method of the rolling bearing unit of the present invention also inserts and fixes the hard inlay shell 1010 into the second inlay groove 123 of the lower base body 12 and the first inlay groove 113 of the upper base body 11, and the load surface of the hard inlay shell 1010 is smoothly connected with the first swirling groove body 111 and the second swirling groove body 121, so as to ensure the strength of the swirling groove cavity 100 at the window 200, avoid the phenomenon of cracking due to extrusion when the rolling element 2 contacts the outside, and improve the service life of the product.

[0084] Combined Figure 9 As shown, the present invention also discloses a manufacturing method of a second rolling bearing unit, and the manufacturing method includes the following steps:

[0085] S001: Manufacture the lower base body 12: The lower base body 12 is formed by high-pressure precision molding of metal powder, and the lower base body 12 is tapped to form a screw hole, and then the upper end surface of the lower base body 12 is ground to form a second swirling groove body 121 with a semicircular cross-section and a second opening 122 located on one side of the second swirling groove body 121; then the outer shape of the lower base body 12 and the rear walls of the second swirling groove body 121 and the second opening 122 are polished by a polishing device;

[0086] S002: Manufacture the polymer functional layer 3 for noise reduction. A layer of polymer composite material is sprayed on the inner wall of the second swirling groove body 121 to form the polymer functional layer 3, and the polymer functional layer is ground and polished;

[0087] S003: Manufacture the upper base body 11: The above-mentioned lower base body 12 is turned over 180° to be used as the upper base body 11; that is, the lower end of the upper base body 11 has a first swirling groove body 111 with a semicircular cross-section and a first opening 112 located on one side of the first swirling groove body 111;

[0088] S004: Manufacture the rolling element: The rolling element 2 is made of metal or metal oxide material;

[0089] S005: Place multiple rolling elements 2 on the polymer functional layer 3 on the inner wall of the second circumferential groove 121 in the lower base 12, cover the upper base 11, and form the base 1 by fixing with screws and screw holes. The second circumferential groove 121 is docked with the first circumferential groove 111 to form a circumferential groove cavity 100 for the rolling elements 2 to move and in a ring shape, and the first opening 112 and the second opening 122 are docked to form a window 200 that can accommodate partial exposure of the rolling elements 2, thus manufacturing a rolling bearing unit; or, assemble multiple rolling elements 2 in a noise-reducing segmented chain in a rollable manner, then place the noise-reducing segmented chain in the second circumferential groove 121 of the lower base 12, cover the upper base 11, and form the base 1 by fixing with screws and screw holes. The second circumferential groove 121 is docked with the first circumferential groove 111 to form a circumferential groove cavity 100 for the rolling elements 2 to move and in a ring shape, and the first opening 112 and the second opening 122 are docked to form a window 200 that can accommodate partial exposure of the rolling elements 2, thus manufacturing a rolling bearing unit.

[0090] The manufacturing method of the second type of rolling bearing unit above is extremely simple. When manufacturing the base 1, only the lower base 12 needs to be manufactured, that is, the upper base 11 and the lower base 12 can be used interchangeably, making the manufacturing more simple, reducing the process / method steps, having a lower cost, and only one set of molds needs to be opened to manufacture the upper base 11 or the lower base 12, making it more convenient to use; the manufacturing method of the second type of rolling bearing unit enables the upper base 11 and the lower base 12 to be made of metal materials, and their strength is sufficient, so that in the later stage, there is no need to manufacture a hard inlay shell and inlay the hard inlay shell as a hard layer as in the manufacturing method of the first type of rolling bearing unit, thus making the product structure simpler and having fewer manufacturing process / method steps; in addition, the manufacturing method of the rolling bearing unit of the present invention also sprays a layer of polymer composite material on the inner wall of the second circumferential groove 121 in the lower base 12 to form the polymer functional layer 3, which is very simple to manufacture, and the effect of noise reduction and noise elimination is achieved through the polymer functional layer 3.

[0091] Combined Figure 10 As shown in

[0092] S001: Manufacture the lower base 12: Use high-pressure precision forming of metal powder to manufacture the lower base 12, tap the lower base 12 to form screw holes, and then perform grinding processing to form a second circumferential groove 121 with a semi-circular cross-section on the upper end surface of the lower base 12 and a second opening 122 located on one side of the second circumferential groove 121; then polish the outer shape of the lower base 12 and the second circumferential groove 121 and the second opening 122 through a polishing device;

[0093] S002: Fabricate the polymer functional layer 3 for noise reduction. First, use a polymer composite material to fabricate a thin-walled pipe fitting through an injection molding device. The thin-walled pipe fitting is fixed to the inner wall of the second swirling groove body 121 by means of inlaying to form the polymer functional layer 3 on the inner wall of the second swirling groove body 121.

[0094] S003: Fabricate the upper base 11: Flip the above-mentioned lower base 12 by 180° to serve as the upper base 11. That is, the lower end of the upper base 11 has a first swirling groove body 111 with a semi-circular cross-section and a first opening 112 located on one side of the first swirling groove body 111.

[0095] S004: Fabricate the rolling elements: The rolling elements 2 are made of metal or metal oxide materials.

[0096] S005: Place multiple rolling elements 2 on the polymer functional layer 3 on the inner wall of the second swirling groove body 121 in the lower base 12, and cover the upper base 11. After fixing by screws in cooperation with screw holes, the base 1 is formed. And the second swirling groove body 121 is docked with the first swirling groove body 111 to form a swirling groove cavity 100 for the rolling elements 2 to move and in a ring shape. And the first opening 112 and the second opening 122 are docked to form a window 200 that can accommodate partial exposure of the rolling elements 2, thus fabricating a rolling bearing unit. Or, assemble multiple rolling elements 2 in a noise reduction segmented chain in a rollable manner, then place the noise reduction segmented chain in the second swirling groove body 121 of the lower base 12, and cover the upper base 11. After fixing by screws in cooperation with screw holes, the base 1 is formed. And the second swirling groove body 121 is docked with the first swirling groove body 111 to form a swirling groove cavity 100 for the rolling elements 2 to move and in a ring shape. And the first opening 112 and the second opening 122 are docked to form a window 200 that can accommodate partial exposure of the rolling elements 2, thus fabricating a rolling bearing unit.

[0097] The fabrication method of the above-mentioned third rolling bearing unit is extremely simple. When fabricating the base 1, only the lower base 12 needs to be fabricated. That is, the upper base 11 and the lower base 12 can be used interchangeably, making the fabrication more simple, reducing the process / method steps, having a lower cost, and only one set of molds needs to be opened to fabricate the upper base 11 or the lower base 12, which is more convenient to use. The fabrication method of the third rolling bearing unit enables the upper base 11 and the lower base 12 to be made of metal materials, with sufficient strength, so that later there is no need to fabricate a hard inlay shell as in the fabrication method of the first rolling bearing unit and inlay the hard inlay shell as a hard layer, thus making the product structure simpler and having fewer fabrication process / method steps. In addition, the fabrication method of the rolling bearing unit of the present invention also inlays a thin-walled pipe fitting of a polymer composite material on the inner wall of the second swirling groove body 121 in the lower base 12 to form the polymer functional layer 3, and the effect of noise reduction is achieved through the polymer functional layer 3.

[0098] The present invention may also be a rolling bearing unit with another structure, in combination with Figure 15-17 As shown, it includes a base body 1 and a plurality of rolling elements 2 disposed within the base body 1 and capable of rolling along a swirling groove cavity 100 within the base body 1. One side of the swirling groove cavity 100 has a window 200 that can accommodate a partial exposure of the rolling element 2. The base body 1 is composed of an upper base body 11, a middle base body 13, and a lower base body 12 that are sequentially butted and fixed together from top to bottom. The lower end surface of the upper base body 11 is provided with a first swirling groove body 111 having a semi-circular cross-section. The upper end surface of the lower base body 12 is provided with a second swirling groove body 121 having a semi-circular cross-section. The upper end surface of the middle base body 13 is provided with a third swirling groove body 131 having a semi-circular cross-section. The third swirling groove body 131 and the first swirling groove body 111 are butted to form the first swirling groove cavity. And a first opening 112 on one side of the first swirling groove body 111 and a third opening 133 on one side of the third swirling groove body 131 are butted to form the first window, and a part of the rolling elements in the first swirling groove cavity extends out of the first window. The lower end surface of the middle base body 13 is provided with a fourth swirling groove body 132 having a semi-circular cross-section. The fourth swirling groove body 132 and the second swirling groove body 121 are butted to form the second swirling groove cavity. And a second opening 122 on one side of the second swirling groove body 121 and a fourth opening 134 on one side of the fourth swirling groove body 132 are butted to form the second window. A part of the rolling elements in the second swirling groove cavity extends out of the second window.

[0099] In the present invention, the structure of the base body 1 is simple, being a three-piece up-and-down stacked structure similar to the structure of a hamburger. It has few parts, is easy to process, convenient to assemble, low in cost, and has two layers of rolling elements, thereby forming a stable rolling support to ensure more stable operation. Additionally, since it is composed of the upper base body 11, the middle base body 13, and the lower base body 12 that are sequentially butted and fixed together from top to bottom, it is convenient to design the swirling groove cavity 100 and the window 200, which can further reduce the manufacturing cost and simplify the manufacturing process, making the present invention highly competitive in the market.

[0100] The rolling bearing unit of the present invention may also be the following third structure.

[0101] In combination with Figure 18-24As shown, the rolling bearing unit includes a base body 1 and a plurality of rolling elements 2 disposed within the base body 1 and capable of rolling along a swirling groove cavity 100 within the base body 1. The base body 1 is composed of a left base body 14 and a right base body 15 that are fixed together by left-right mating. A ring-shaped and L-shaped swirling groove cavity 100 is formed between the left base body 14 and the right base body 15. At the lower end of the mating surface of the left base body 14 and the right base body 15, a convex seat 142 that protrudes outward and is trapezoidal is formed. The right base body 15 is provided with a fifth opening 152 that penetrates the front and rear end faces. The convex seat 142 is embedded in the fifth opening 152 and exposed on the front end face of the right base body 15. The swirling groove cavity 100 also communicates with the front end face of the convex seat 142, so that a number of rolling elements 2 are exposed on the front end face of the convex seat 142, and all the rolling elements 2 form a non-coplanar rolling chain.

[0102] The structure of the above base body 1 is simple, being a two-piece left-right stacking / mating structure. It has few parts, is easy to process, convenient to assemble, low in cost, and has two layers of rolling elements, thus forming a stable rolling support to ensure more stable operation. In addition, since it is composed of a left base body 14 and a right base body 15 that are sequentially fixed together by left-right mating, it is convenient to design the swirling groove cavity 100, which can further reduce the manufacturing cost and simplify the manufacturing process, making the present invention highly competitive in the market. In addition, since the convex seat 142 of the left base body 14 is embedded in the fifth opening 152 of the right base body 15 and exposed on the front end face of the right base body 15, the swirling groove cavity 100 is ring-shaped and L-shaped, that is, a non-coplanar ring structure, and thereby all the rolling elements 2 installed in the swirling groove cavity 100 form a non-coplanar rolling chain, and a number of rolling elements 2 are exposed on the front end face of the convex seat 142, that is, exposed on the front end face of the right base body 15. Combining Figure 24 As shown, the rolling bearing unit 1000 of this structure can be installed on both sides of the sliding table 51. Later, the two rolling bearing units 1000 are respectively placed outside both sides of the rail beam 52. The rolling elements 2 exposed on the front end face of the right base body 15 of the rolling bearing unit 1000 are partially embedded in the rail grooves 521 on both sides of the rail beam 52 to complete the assembly. And the width of this assembly structure becomes smaller, and the assembly structure is stable and has great strength, with stronger load-bearing capacity, and can be applied to optimize linear motor application scenarios, such as reducing the height of the entire linear motor. On both sides of the front end face of the right base body 15, guiding convex portions 153 corresponding to the first horizontal grooves 1414 are formed. The guiding convex portions 153 and the rolling elements 2 exposed on the front end face of the convex seat 142 are on the same straight line. The guiding convex portions 153 generally do not contact the inner wall of the rail groove 521. Only when the entire rolling bearing unit is subjected to excessive force, the guiding convex portions 153 may contact the inner wall of the slide rail groove, thereby enhancing the load-bearing capacity and preventing derailment.

[0103] The specific structure is as follows: the butting surfaces of the left base 14 and the right base 15 are respectively provided with a third gyroscopic groove body 141 and a fourth gyroscopic groove body 151 with semicircular cross-sections. The third gyroscopic groove body 141 and the fourth gyroscopic groove body 151 are both open structures, which are easy to open / manufacture.

[0104] The third gyroscopic groove body 141 includes a first C-shaped groove 1411 formed on the surface where the left base 14 and the right base 15 are connected, a first inclined groove 1412 and a second inclined groove 1413 connected to both ends of the first C-shaped groove 1411 and respectively on the two sides of the convex seat 142, and a first horizontal groove 1414 connected between the first inclined groove 1412 and the second inclined groove 1413 and distributed on the front end surface of the convex seat 142; the fourth gyroscopic groove body 151 includes a second C-shaped groove 1511 formed on the surface where the right base 15 and the left base 14 are connected, The third inclined groove 1512 and the fourth inclined groove 1513 are at both ends of the second C-shaped groove 1511 and connected to the fifth opening 152; the first C-shaped groove 1411, the first inclined groove 1412 and the second inclined groove 1413 are respectively connected to the second C-shaped groove 1511, the third inclined groove 1512 and the fourth inclined groove 1513, and the third inclined groove 1512 and the fourth inclined groove 1513 are respectively connected to both ends of the first horizontal groove 1414, and the boss 142 is exposed in the fifth opening 152, so as to form an L-shaped annular spiral groove cavity 100.

[0105] The upper and lower edges of the first horizontal groove 1414 are both formed with a third lip 1415 , and the third lip 1520 can wrap the rolling body 2 to prevent the rolling body 2 from escaping from the first horizontal groove 1414 , that is, to prevent the rolling body 2 from escaping from the base 1 .

[0106] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A rolling bearing unit, comprising a base body (1) and a plurality of rolling elements (2) arranged in the base body (1) and capable of rolling along a spiral groove cavity (100) in the base body (1). One side of the spiral groove cavity (100) has a window (200) that can accommodate a partial exposure of the rolling element (2). Characterized in that: On one side of the base body (1), there are also provided a first anti - detachment guiding part (101) and a second anti - detachment guiding part (102) protruding outward. The first anti - detachment guiding part (101) and the second anti - detachment guiding part (102) are distributed on both sides of the window (200), and the outer surface of the part of the rolling element (2) after passing through the window (200) also protrudes outside the first anti - detachment guiding part (101) and the second anti - detachment guiding part (102). When the rolling element (2) is installed in the slide rail groove, the first anti - detachment guiding part (101) and the second anti - detachment guiding part (102) do not contact the inner wall of the slide rail groove. Only when the entire rolling bearing unit is under excessive force, the first anti - detachment guiding part (101) and the second anti - detachment guiding part (102) will contact the inner wall of the slide rail groove, thereby enhancing the bearing capacity and preventing derailment; The base body (1) is composed of an upper base body (11) and a lower base body (12) fixed together by upper - lower mating. The mating surfaces of the upper base body (11) and the lower base body (12) are respectively provided with a first spiral groove body (111) and a second spiral groove body (121) with a semi - circular cross - section. After the first spiral groove body (111) and the second spiral groove body (121) are mated, the spiral groove cavity (100) in the shape of an oval is formed; and the first opening (112) on one side of the first spiral groove body (111) and the second opening (122) on one side of the second spiral groove body (121) are mated to form the window (200).

2. The rolling bearing unit according to claim 1, Characterized in that: Both the upper base body (11) and the lower base body (12) are integrally formed of a metal or metal oxide material; a polymer functional layer (3) for noise reduction is provided on the inner wall of the spiral groove cavity (100), and the rolling element (2) contacts the polymer functional layer (3). Among them, the polymer functional layer (3) is a coating, which is coated on the inner wall of the spiral groove cavity (100); or the polymer functional layer (3) is a pipe fitting, which is inlaid and fixed on the inner wall of the spiral groove cavity (100).

3. The rolling bearing unit according to claim 1, Characterized in that: Both the upper base body (11) and the lower base body (12) are integrally formed of a polymer composite material; hard inlay shells (1010) are provided at the first opening (112) of the first spiral groove body (111) and the second opening (122) of the second spiral groove body (121).

4. The rolling bearing unit according to claim 1, Characterized in that: The first circumferential groove body (111) is formed with a first lip (110) at the edge of the first opening (112), and the second circumferential groove body (121) is formed with a second lip (120) at the edge of the second opening (122). The second lip (120) is placed below the first lip (110), and the first lip (110) and the second lip (120) cooperate to restrict the rolling elements (2) to rotate within the circumferential groove cavity (100). There is a spacer (4) between the rolling elements (2), and the spacer (4) spaces the rolling elements (2) apart. Among them, the spacer (4) is a flexible noise-reducing segmented chain structure.

5. A rolling bearing unit, which includes a base body (1) and a plurality of rolling elements (2) arranged in the base body (1) and capable of rolling along the circumferential groove cavity (100) in the base body (1). One side of the circumferential groove cavity (100) has a window (200) that can accommodate a partial exposure of the rolling elements (2). It is characterized in that: One side of the base body (1) is also provided with a first anti-disengagement guiding part and a second anti-disengagement guiding part that protrude outward. The first anti-disengagement guiding part and the second anti-disengagement guiding part are distributed on both sides of the window (200), and the outer surface of the part of the rolling element (2) after passing through the window (200) also protrudes outside the first anti-disengagement guiding part and the second anti-disengagement guiding part. When the rolling element (2) is installed in the slide rail groove, the first anti-disengagement guiding part and the second anti-disengagement guiding part will not contact the inner wall of the slide rail groove. Only when the entire rolling bearing unit is subjected to excessive force, the first anti-disengagement guiding part and the second anti-disengagement guiding part will contact the inner wall of the slide rail groove, so as to enhance the bearing capacity and prevent derailment. The base body (1) is composed of an upper base body (11), a middle base body (13), and a lower base body (12) that are fixedly joined together in sequence from top to bottom. The lower end surface of the upper base body (11) is provided with a first circumferential groove body (111) with a semicircular cross-section. The upper end surface of the lower base body (12) is provided with a second circumferential groove body (121) with a semicircular cross-section. The upper end surface of the middle base body (13) is provided with a third circumferential groove body (131) with a semicircular cross-section. The third circumferential groove body (131) and the first circumferential groove body (111) are butted to form the first circumferential groove cavity as described above. And the first opening (112) on one side of the first circumferential groove body (111) and the third opening (133) on one side of the third circumferential groove body (131) are butted to form the first window as described above. A part of the rolling elements in the first circumferential groove cavity protrude outside the first window. The lower end surface of the middle base body (13) is provided with a fourth circumferential groove body (132) with a semicircular cross-section. The fourth circumferential groove body (132) and the second circumferential groove body (121) are butted to form the second circumferential groove cavity as described above. And the second opening (122) on one side of the second circumferential groove body (121) and the fourth opening (134) on one side of the fourth circumferential groove body (132) are butted to form the second window as described above. A part of the rolling elements in the second circumferential groove cavity protrude outside the second window.

6. A rolling bearing unit, which includes a base body (1) and a plurality of rolling elements (2) arranged in the base body (1) and capable of rolling along the circumferential groove cavity (100) in the base body (1). It is characterized in that: The base body (1) is composed of a left base body (14) and a right base body (15) which are fixedly joined together in a left-right opposed manner, and a ring-shaped swirling groove cavity (100) is formed between the left base body (14) and the right base body (15). A convex seat (142) which protrudes outward and is trapezoidal is formed at the lower end of the surface where the left base body (14) and the right base body (15) are butted. The right base body (15) is provided with a fifth opening (152) penetrating through the front and rear end faces. The convex seat (142) is embedded in the fifth opening (152) and exposed on the front end face of the right base body (15), and the swirling groove cavity (100) is also communicated with the front end face of the convex seat (142), so that a plurality of rolling elements (2) are exposed on the front end face of the convex seat (142), and all the rolling elements (2) form a non-coplanar rolling chain; The rolling elements (2) exposed on the front end face of the right base body (15) in the rolling bearing unit are partially embedded in the rail grooves (521) on both sides of the rail beam (52). Guide convex parts (153) corresponding to the first horizontal grooves (1414) of the third swirling groove body (141) are formed on both sides of the front end face of the right base body (15). The guide convex parts (153) and the rolling elements (2) exposed on the front end face of the convex seat (142) are located on the same straight line. The guide convex parts (153) generally do not contact the inner wall of the rail groove (521). Only when the whole rolling bearing unit is overloaded, the guide convex parts (153) may contact the inner wall of the slide rail groove, thereby enhancing the bearing capacity and preventing derailment.

7. The rolling bearing unit according to claim 6, It is characterized in that: The surfaces of the left base body (14) and the right base body (15) that are butted are respectively provided with a third revolving groove body (141) and a fourth revolving groove body (151) with a semi-circular cross-section. Among them, the third revolving groove body (141) includes a first C-shaped groove (1411) formed on the butting surface of the left base body (14) and the right base body (15), a first inclined groove (1412) and a second inclined groove (1413) connected to both ends of the first C-shaped groove (1411) and respectively on both side surfaces of the convex seat (142), and a first horizontal groove (1414) connected between the first inclined groove (1412) and the second inclined groove (1413) and distributed on the front end surface of the convex seat (142); the fourth revolving groove body (151) includes a second C-shaped groove (1511) formed on the butting surface of the right base body (15) and the left base body (14), a third inclined groove (1512) and a fourth inclined groove (1513) connected to both ends of the second C-shaped groove (1511) and communicating with the fifth opening (152); the first C-shaped groove (1411), the first inclined groove (1412) and the second inclined groove (1413) are respectively butted with the second C-shaped groove (1511), the third inclined groove (1512) and the fourth inclined groove (1513), and the third inclined groove (1512) and the fourth inclined groove (1513) respectively communicate with both ends of the first horizontal groove (1414), and the convex seat (142) is exposed in the fifth opening (152), so as to form a revolving groove cavity (100) in an L-shaped ring; third lips (1415) are formed on both the upper and lower edges of the first horizontal groove (1414).

8. A manufacturing method of a rolling bearing unit as described in claim 1, characterized in that: The manufacturing method includes the following steps: S001: Manufacturing the lower base body (12): Embedding a metal nut into an injection mold, injecting molten polymer composite material into the injection mold by the injection mold, and cooling to form a lower base body (12) with a metal nut. The upper end surface of the lower base body (12) has a second revolving groove body (121) with a semi-circular cross-section and a second opening (122) located on one side of the second revolving groove body (121), and a second inlay groove (123) is provided in a section of the second revolving groove body (121) corresponding to the second opening (122); S002: Manufacturing the upper base body (11): Turning the above-mentioned lower base body (12) by 180° as the upper base body (11); that is, the lower end of the upper base body (11) has a first revolving groove body (111) with a semi-circular cross-section and a first opening (112) located on one side of the first revolving groove body (111); and a first inlay groove (113) is provided in a section of the first revolving groove body (111) corresponding to the first opening (112); S003: Manufacturing the hard inlay shell (1010): Using an automated device to draw an inlay tube blank from a metal material and divide and form it into a hard inlay shell (1010), or, alternatively, precision pressing a hard inlay shell (1010) using a metal or metal oxide material, and at the same time grinding and polishing the load surface of the hard inlay shell (1010); S004: Manufacturing rolling elements: The rolling elements (2) are made of metal or metal oxide materials; S005: Assembly of the rolling bearing unit: The hard inlay shell (1010) is inserted into the second inlay groove (123) of the lower base (12). A plurality of rolling elements (2) are placed in the second revolving groove body (121) of the lower base (12) and the hard inlay shell (1010), and the upper base (11) is covered. After being fixed by screws and metal nuts, a base body (1) is formed. The second revolving groove body (121), the first revolving groove body (111), and the hard inlay shell (1010) are butted to form a revolving groove cavity (100) for the rolling elements (2) to move and in a ring shape. The first opening (112), the second opening (122), and the hard inlay shell (1010) are butted to form a window (200) that can accommodate a partial exposure of the rolling elements (2), and the rolling elements (2) are partially exposed outside the window (200) to make a rolling unit; or, a plurality of rolling elements (2) are assembled in the noise reduction segmented chain in a rollable manner, and then the noise reduction segmented chain is placed in the second revolving groove body (121) of the lower base (12) and the hard inlay shell (1010), and the upper base (11) is covered. After being fixed by screws and metal nuts, a base body (1) is formed. The second revolving groove body (121), the first revolving groove body (111), and the hard inlay shell (1010) are butted to form a revolving groove cavity (100) for the rolling elements (2) to move and in a ring shape. The first opening (112), the second opening (122), and the hard inlay shell (1010) are butted to form a window (200) that can accommodate a partial exposure of the rolling elements (2), and the rolling elements (2) are partially exposed outside the window (200) to make a rolling bearing unit.

9. A manufacturing method of a rolling bearing unit as claimed in claim 1, characterized in that: the manufacturing method includes the following steps: S001: Manufacturing the lower base (12): The lower base (12) is manufactured by high-pressure precision forming of metal powder, and tapping is performed on the lower base (12) to form screw holes. Then, through grinding, a second revolving groove body (121) with a semi-circular cross-section and a second opening (122) located on one side of the second revolving groove body (121) are formed on the upper end surface of the lower base (12); then, the outer shape of the lower base (12), the inner wall of the second revolving groove body (121), and the rear wall of the second opening (122) are polished by a polishing device; S002: Manufacturing the polymer functional layer (3) for noise reduction and silencing, spraying a layer of polymer composite material on the inner wall of the second revolving groove body (121) to form the polymer functional layer (3), and grinding and polishing the polymer functional layer; S003: Manufacturing the upper base (11): The above-mentioned lower base (12) is turned 180° to be used as the upper base (11); that is, the lower end of the upper base (11) has a first revolving groove body (111) with a semi-circular cross-section and a first opening (112) located on one side of the first revolving groove body (111); S004: Manufacturing rolling elements: The rolling elements (2) are made of metal or metal oxide materials; S005: Place multiple rolling elements (2) on the polymer functional layer (3) on the inner wall of the second circumferential groove body (121) in the lower base body (12), cover the upper base body (11), and form the base body (1) after fixing by screwing into the screw holes. The second circumferential groove body (121) is docked with the first circumferential groove body (111) to form a circumferential groove cavity (100) for the rolling elements (2) to move and in a ring shape, and the first opening (112) and the second opening (122) are docked to form a window (200) that can accommodate partial exposure of the rolling elements (2), thus making a rolling bearing unit; or, assemble multiple rolling elements (2) in a noise-reducing segmented chain in a rollable manner, then place the noise-reducing segmented chain in the second circumferential groove body (121) of the lower base body (12), cover the upper base body (11), and form the base body (1) after fixing by screwing into the screw holes. The second circumferential groove body (121) is docked with the first circumferential groove body (111) to form a circumferential groove cavity (100) for the rolling elements (2) to move and in a ring shape, and the first opening (112) and the second opening (122) are docked to form a window (200) that can accommodate partial exposure of the rolling elements (2), thus making a rolling bearing unit.

10. A manufacturing method of a rolling bearing unit as claimed in claim 1, characterized in that: the manufacturing method includes the following steps: S001: Manufacture the lower base body (12): Use high-pressure precision forming of metal powder to manufacture the lower base body (12), tap the lower base body (12) to form screw holes, and then perform grinding machining to form a second circumferential groove body (121) with a semi-circular cross-section on the upper end surface of the lower base body (12) and a second opening (122) located on one side of the second circumferential groove body (121); then polish the outer shape of the lower base body (12) and the second circumferential groove body (121) and the second opening (122) through a polishing device; S002: Manufacture the polymer functional layer (3) for noise reduction and silencing. First, use a polymer composite material to manufacture a thin-walled pipe through an injection molding device, and fix the thin-walled pipe to the inner wall of the second circumferential groove body (121) by inlaying to form the polymer functional layer (3) on the inner wall of the second circumferential groove body (121); S003: Manufacture the upper base body (11): Flip the above-mentioned lower base body (12) by 180° as the upper base body (11); that is, the lower end of the upper base body (11) has a first circumferential groove body (111) with a semi-circular cross-section and a first opening (112) located on one side of the first circumferential groove body (111); S004: Manufacture the rolling elements: Manufacture the rolling elements (2) using metal or metal oxide materials; S005: Place multiple rolling elements (2) on the polymer functional layer (3) on the inner wall of the second revolving groove body (121) in the lower base body (12), cover the upper base body (11), and form the base body (1) after fixing by screwing into the screw holes. The second revolving groove body (121) is docked with the first revolving groove body (111) to form a revolving groove cavity (100) for the rolling elements (2) to move and in a ring shape, and the first opening (112) and the second opening (122) are docked to form a window (200) that can accommodate partial exposure of the rolling elements (2), thus manufacturing a rolling bearing unit; alternatively, assemble multiple rolling elements (2) in a noise-reducing segmented chain in a rollable manner, then place the noise-reducing segmented chain in the second revolving groove body (121) of the lower base body (12), cover the upper base body (11), and form the base body (1) after fixing by screwing into the screw holes. The second revolving groove body (121) is docked with the first revolving groove body (111) to form a revolving groove cavity (100) for the rolling elements (2) to move and in a ring shape, and the first opening (112) and the second opening (122) are docked to form a window (200) that can accommodate partial exposure of the rolling elements (2), thus manufacturing a rolling bearing unit.

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