Thrust cylindrical roller bearing solid retainer, machining method and milling cutter for machining

Abstract

The application relates to a thrust cylindrical roller bearing solid retainer, which comprises an annular body provided integrally, a plurality of square pockets are formed in the annular body, each square pocket comprises two oppositely arranged radial sides and two oppositely arranged axial sides, a rolling surface is arranged in the middle of the radial side in the radial direction, and a lock roller surface and a guide surface are sequentially arranged on both sides of the rolling surface. The lock roller surface arranged in the square pocket can prevent the rolling body from falling out, and the guide surface arranged in the square pocket facilitates the installation of the roller. The thrust cylindrical roller bearing solid retainer machining method has high machining precision, is convenient to operate and has high machining efficiency. The thrust cylindrical roller bearing solid retainer machining milling cutter can machine the structures of various surfaces in the pockets of the thrust cylindrical roller bearing solid retainer through one milling cutter, can guarantee the smooth machining of the thrust cylindrical roller bearing solid retainer and has high machining efficiency.

Description

Technical Field

[0001] This invention relates to the field of bearing cage technology, and more particularly to a solid cage for thrust cylindrical roller bearings, a machining method, and a milling cutter for machining. Background Technology

[0002] Currently, in the bearing manufacturing field, the cage structure of thrust cylindrical roller bearings is a separate structure of cover and seat. The function of the cage cover is to prevent the rollers from falling out radially after they are installed in the cage pockets. After the rolling elements are installed in the cage, a cage assembly is formed. During manufacturing, the cage cover and seat are machined separately. During final assembly, after the rollers are installed in the cage pockets, the cage cover and seat are connected together using spring pins or screws. The connection of the rolling elements, cage cover, and cage seat is called the cage assembly. This connection method suffers from instability problems during installation and use, such as rivet breakage or pin failure, which seriously affects the bearing's service life. There is an urgent need to design a new solid cage for thrust cylindrical roller bearings. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a solid cage for thrust cylindrical roller bearings, which is integrally set, has a stable structure, avoids the various instability problems caused by the existing separate cover and seat cages, and can improve the service life of the bearing.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A thrust cylindrical roller bearing solid cage includes an integrally formed annular body. The annular body has multiple square pockets. Each square pocket includes two radially arranged sides and two axially arranged sides. The two radially arranged sides are adapted to the outer peripheral surface of the cylindrical roller, and the two axially arranged sides are adapted to the end face of the cylindrical roller. A rolling surface is provided radially in the middle of the radially arranged sides, and a locking roller surface and a guide surface are respectively provided on both sides of the rolling surface.

[0006] Furthermore, both locking roller surfaces and both guide surfaces are symmetrically arranged about the rolling surface.

[0007] Furthermore, the rolling surface is a concave arc surface, which is adapted to the cylindrical roller.

[0008] Furthermore, the guide surface is an outwardly inclined slope.

[0009] Furthermore, the included angle between the two opposing inclined planes is 6 degrees.

[0010] Furthermore, the cylindrical roller is in contact with the surface line of the locking roller.

[0011] Furthermore, the cylindrical roller and the locking roller are in surface-to-surface contact.

[0012] Furthermore, the rolling surface and the locking roller surface, as well as the locking roller surface and the guide surface, all have a smooth transition, and an arc transition surface is provided at the intersection of the guide surface and the end face of the annular body.

[0013] Furthermore, the four corners of the square pocket are provided with grooves along the axial direction.

[0014] Furthermore, a crossbeam is provided between adjacent square pockets, the radial side is formed on the crossbeam, and the locking roller surface is formed on the boss on the side wall of the crossbeam and the adjacent pocket.

[0015] The advantages of the thrust cylindrical roller bearing solid cage of the present invention compared with the prior art are:

[0016] The present invention provides a thrust cylindrical roller bearing cage comprising an integrally formed annular body. The annular body has multiple square pockets, each pocket including two opposing radial sides and two opposing axial sides. The two radial sides are adapted to the outer circumferential surface of the cylindrical roller, and the two axial sides are adapted to the end face of the cylindrical roller. A rolling surface is radially arranged at the center of each radial side, and a locking roller surface and a guide surface are sequentially arranged on both sides of the rolling surface. This integrally formed structure provides structural stability and improves bearing service life. The locking roller surface within the square pockets prevents the rolling elements from falling out, and the guide surface within the square pockets facilitates roller installation.

[0017] Another object of the present invention is to provide a method for machining the above-mentioned thrust cylindrical roller bearing solid cage, wherein the rolling surface, locking roller surface and guide surface on the radial side of the square pocket hole are machined by a forming milling cutter.

[0018] The advantages of the thrust cylindrical roller bearing solid cage machining method of the present invention compared with the prior art are:

[0019] The method for machining the solid cage of a thrust cylindrical roller bearing provided by this invention has high machining accuracy, is easy to operate, and has high machining efficiency.

[0020] Another object of the present invention is to provide a milling cutter for machining the above-mentioned thrust cylindrical roller bearing solid cage, comprising: a cutter shank, wherein the outer peripheral surface of the end of the cutter shank is provided with at least one cutting edge portion and a chip removal groove adapted to the cutting edge portion, the cutting edge portion including a rake face, a flank face, and a combined cutting edge formed by the intersection of the rake face and the flank face, the cutting edge profile curve of the combined cutting edge including an outwardly convex arc segment located in the middle, and both ends of the outwardly convex arc segment being connected in sequence by a straight line segment and an oblique line segment, wherein the end of the oblique line segment away from the straight line segment is inclined to the side away from the central axis of the cutter shank.

[0021] Furthermore, the two straight line segments and the two oblique line segments are symmetrically arranged about the convex arc segment.

[0022] Furthermore, the connection points between the convex arc segment and the straight line segment, as well as the connection points between the straight line segment and the oblique line segment, are all circular arc transitions.

[0023] Furthermore, each of the two oblique line segments is provided with a concave arc blade at one end that is far apart from each other, and each concave arc blade has a smooth transition with its corresponding oblique line segment.

[0024] Furthermore, the cutting edge consists of three circumferentially distributed blades, with the chip removal grooves provided between adjacent two cutting edges.

[0025] Furthermore, the chip removal groove is a V-shaped groove.

[0026] Furthermore, the rake face is one side wall of the chip removal groove.

[0027] Furthermore, the blade portion is entirely recessed within the outer circumferential surface of the blade holder.

[0028] Furthermore, the combined cutting edge is arranged along the axial direction of the tool holder.

[0029] Furthermore, the convex arc segment is formed on the drum-shaped segment located in the middle of the flank face, the straight segment is formed on the cylindrical segment of the flank face, and the oblique segment is formed on the conical segment of the flank face.

[0030] The advantages of the milling cutter for machining the solid cage of a thrust cylindrical roller bearing of the present invention compared with the prior art are:

[0031] The present invention provides a milling cutter for machining solid cages of thrust cylindrical roller bearings, comprising: a cutter shank, wherein the outer circumferential surface of the end of the cutter shank is provided with at least one cutting edge and a chip removal groove adapted to the cutting edge; the cutting edge includes a rake face, a flank face, and a combined cutting edge formed by the intersection of the rake face and the flank face; the cutting edge profile of the combined cutting edge includes a convex arc segment located in the middle, and straight line segments and oblique line segments connected sequentially at both radial ends of the convex arc segment; the end of the oblique line segment away from the straight line segment is inclined towards the side away from the central axis of the cutter shank. It can machine the structure of each surface inside the pocket of a solid cage of a thrust cylindrical roller bearing with a single milling cutter, ensuring smooth machining of the solid cage of the thrust cylindrical roller bearing and achieving high machining efficiency. Attached Figure Description

[0032] Figure 1 This is a schematic front view of the solid cage structure of a thrust cylindrical roller bearing according to an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram of the AA-direction structure in the diagram;

[0034] Figure 3 This is a three-dimensional structural schematic diagram of the solid cage of a thrust cylindrical roller bearing according to an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the front view structure of the milling cutter according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the left-side structure of the milling cutter according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the three-dimensional structure of the milling cutter according to an embodiment of the present invention.

[0038] In the figure: 1. Annular body, 2. Square pocket, 3. Rolling surface, 4. Boss, 4.1. Locking roller surface, 5. Guide surface, 6. Crossbeam, 7. Circular transition surface, 8. Groove, B. Angle between two opposing inclined surfaces, 9. Tool holder, 10. Chip removal groove, 11. Rake face, 12. Back face, 13. Outwardly convex arc segment, 14. Straight line segment, 15. Inclined line segment, 16. Inwardly concave arc cutting edge. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] Example 1

[0041] like Figure 1-3As shown, the thrust cylindrical roller bearing solid cage includes an integrally formed annular body 1. The annular body 1 has multiple square pockets 2 for mounting cylindrical rollers. The multiple square pockets 2 are evenly distributed around the central axis of the annular body 1. Each square pocket 2 includes two radially arranged sides and two axially arranged sides. The two radially arranged sides are adapted to the outer circumferential surface of the cylindrical roller, and the two axially arranged sides are adapted to the end face of the cylindrical roller. A rolling surface 3 is arranged radially in the middle of the radially arranged sides. On both sides of the rolling surface 3, a locking roller surface 4.1 for preventing the roller from falling out of the rolling surface 3 and a guide surface 5 for facilitating the installation of the roller into the rolling surface 3 are respectively arranged.

[0042] It should be noted that the integrated cage design in this embodiment solves the problem of spring pins or screws frequently falling off during bearing installation and use, which seriously affects the bearing's service life. The square pocket 2 is equipped with a locking roller surface 4.1, which locks the rollers within the rolling surface 3, preventing the rolling elements from falling out. A guide surface 5 is also provided within the square pocket 2 to facilitate the installation of cylindrical rollers, thereby ultimately improving the bearing's service life.

[0043] To improve the rationality of the structure and facilitate the installation of the cylindrical rollers from the inside or outside, the two locking roller surfaces 4.1 and the two guide surfaces 5 in this embodiment are symmetrically arranged about the rolling surface 3.

[0044] To improve the smooth operation of the cylindrical roller, the rolling surface 3 is a concave arc surface that matches the outer circumference of the cylindrical roller.

[0045] In this embodiment, the guide surface 5 is an outwardly inclined surface. Preferably, the included angle between the two opposing inclined surfaces inside the pocket is 6 degrees. It should be noted that the inclined design of the guide surface 5 in this embodiment results in a more reasonable structure, which facilitates the smooth installation of the cylindrical roller and avoids damage during installation.

[0046] To improve the performance of the cylindrical roller bearing, in this embodiment, the contact surface 4.1 between the cage and the rolling elements is changed from a point-locked rolling element to a line-locked rolling element. This change from point contact to line contact stabilizes and guides the rolling elements to rotate concentrically along the axial direction, improving the bearing's rotational accuracy. Furthermore, the line contact has high strength, is less prone to wear, and is also easier to manufacture.

[0047] It should be noted that in another embodiment, the cylindrical roller contacts the locking roller surface 4.1 during operation. This contact between the cylindrical roller and the locking roller surface 4.1 improves the roller's operational stability, provides a large contact area, reduces wear, and extends the bearing's service life.

[0048] To ensure rapid installation of the cylindrical rollers and prevent scratches during installation, the rolling surface 3 and the locking roller surface 4.1, as well as the locking roller surface 4.1 and the guide surface 5, are smoothly transitioned. A rounded transition surface 7 (i.e., a chamfered corner) is provided at the intersection of the guide surface 5 and the end face of the annular body 1. During installation, a small external force is applied to the cylindrical rollers, and the cage elastically deforms to allow them to enter the rolling surface 3 within the pocket. Specifically, this external force can be applied by gently tapping and pressing the cylindrical rollers with a rubber mallet. This creates a locking surface with the boss 4, ensuring the cylindrical rollers do not fall out of the pocket. The smooth transition surface also prevents the cage from shedding debris and the rollers from being scratched during bearing assembly.

[0049] To ensure the free rolling of the cylindrical rollers and the smooth operation of the bearing, the square pocket 2 in this embodiment has grooves 8 at its four corners along the axial direction. Preferably, the cross-section of the grooves 8 is arc-shaped. In use, the grooves 8 can also store lubricating oil to facilitate the lubrication of the rollers.

[0050] It should be noted that in this embodiment, a crossbeam 6 is provided between adjacent pockets 2, a radial side is formed on the crossbeam 6, and a locking roller surface 4.1 is formed on the boss 4 on the side wall of the crossbeam 6 and the adjacent pocket. The inner surface of the boss 4 is a plane, and the radial edge of the plane near the arc surface smoothly transitions with the arc surface, and the radial edge of the plane near the inclined surface smoothly transitions with the inclined surface.

[0051] Example 2

[0052] like Figure 4-6 As shown, a milling cutter for machining the solid cage of a thrust cylindrical roller bearing is used to machine the solid cage of the thrust cylindrical roller bearing in Embodiment 1. It includes a cutter shank 9, with at least one cutting edge and a chip removal groove 10 adapted to the cutting edge on the outer circumferential surface of the end of the cutter shank 9. Specifically, in this embodiment, there are three circumferentially distributed cutting edges, and a chip removal groove 10 is provided between two adjacent cutting edges. Its structure is more reasonable, with higher strength and machining accuracy.

[0053] The cutting edge is concave within the outer circumference of the tool holder. Specifically, the cutting edge includes a rake face 11, a flank face 12, and a combined cutting edge formed by the intersection of the rake face 11 and the flank face 12. The combined cutting edge is arranged along the axial direction of the tool holder. The cutting edge profile of the combined cutting edge includes a convex arc segment 13 located in the middle, with straight line segments 14 and oblique line segments 15 connected sequentially to both radial ends of the convex arc segment 13. The oblique line segment 15 is inclined away from the straight line segment 14 towards the side away from the central axis of the tool holder. The two straight line segments 14 and the two oblique line segments 15 are symmetrical about the convex arc segment 13.

[0054] To ensure the accuracy of the radial side of the hole after machining, the connection between the convex arc segment 13 and the straight segment 14, as well as the connection between the straight segment 14 and the oblique segment 15, are all rounded. To facilitate the installation of the cylindrical rolling element, each of the two oblique segments 15 is provided with a concave arc blade 16 at the ends that are far apart from each other, and each concave arc blade 16 has a smooth transition with its corresponding oblique segment 15.

[0055] To facilitate chip removal, the chip removal groove 10 in this embodiment is a V-shaped groove. The rake face 11 is one side wall of the chip removal groove 10.

[0056] In one specific embodiment, the convex arc segment 13 is formed on the drum-shaped segment located in the middle of the flank face 12, the straight segment 14 is formed on the cylindrical segment on the flank face 12, the oblique segment 15 is formed on the conical segment on the flank face 12, and the concave arc cutting edge 16 is formed on the arc groove on the flank face 12.

[0057] During machining, the rolling surface 3 on the pocket is machined through the outwardly convex arc segment 13, the locking roller surface 4.1 on the pocket is machined through the straight line segment 14, the guide surface 5 on the pocket is machined through the oblique line segment 15, and the arc transition surface 7 is provided at the intersection of the guide surface 5 and the end face of the annular body 1, which is machined through the inwardly concave arc cutting edge 16. Its structure is simple, capable of machining all structures on the radial side of the pocket in one operation, with high machining accuracy and efficiency, ensuring the smooth machining of the solid cage of the thrust cylindrical roller bearing.

[0058] Example 3

[0059] This embodiment provides a method for machining the solid cage of the thrust cylindrical roller bearing in Embodiment 1. Specifically, the rolling surface, locking roller surface and guide surface on the radial side of the square pocket hole are machined by a forming milling cutter. The forming milling cutter simultaneously machines a smooth transition structure between the rolling surface 3 and the locking roller surface 4.1, and between the locking roller surface 4.1 and the guide surface 5, and an arc transition surface 7 (i.e., rounded corner) is provided at the intersection of the guide surface 5 and the end face of the annular body 1.

[0060] It should be noted that the forming milling cutter in this embodiment is the milling cutter for machining the solid cage of the thrust cylindrical roller bearing in Embodiment 2.

[0061] It should be noted that this embodiment has all the beneficial effects of Embodiments 1 and 2. In addition, the machining method of the thrust cylindrical roller bearing solid cage of this embodiment can complete the machining of the rolling surface, locking roller surface, guide surface and the arc transition structure between each surface on the radial side of the square pocket hole in one step by using a forming milling cutter. It has high machining efficiency, high machining accuracy and is easy to operate.

[0062] It should be noted that the parts of this invention not described in detail are prior art.

[0063] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "joining," "fixing," and "screw-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0067] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0068] In the description of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] Although embodiments of the present invention have been shown and described above, 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A solid cage for a thrust cylindrical roller bearing, characterized in that: The device includes an integrally formed annular body, on which multiple square pockets are provided. Each square pocket includes two radially arranged sides and two axially arranged sides. The two radially arranged sides are adapted to the outer peripheral surface of the cylindrical roller, and the two axially arranged sides are adapted to the end face of the cylindrical roller. A rolling surface is provided radially in the middle of the radially arranged sides, and a locking roller surface and a guide surface are respectively provided on both sides of the rolling surface. The two locking roller surfaces and the two guide surfaces are symmetrically arranged about the rolling surface. The rolling surface is a concave arc surface that is adapted to the cylindrical roller. The guide surface is an outwardly inclined slope. The included angle between the two opposing inclined surfaces is 6 degrees; the rolling surface and the locking roller surface, and the locking roller surface and the guide surface are all smoothly transitioned; an arc transition surface is provided at the intersection of the guide surface and the end face of the annular body; grooves are provided at the four corners of the square pocket along the axial direction; A crossbeam is provided between adjacent square pockets, the radial side is formed on the crossbeam, and the locking roller surface is formed on the boss on the side wall of the crossbeam and the adjacent pocket; The cage is configured to allow cylindrical rollers to be inserted into the square pocket from either the outer diameter side or the inner diameter side.

2. The milling cutter for machining the solid cage of a thrust cylindrical roller bearing according to claim 1, characterized in that: The tool includes: a tool holder, wherein the outer peripheral surface of the end of the tool holder is provided with at least one cutting edge and a chip removal groove adapted to the cutting edge, the cutting edge includes a rake face, a flank face and a combined cutting edge formed by the intersection of the rake face and the flank face, the cutting edge curve of the combined cutting edge includes an outwardly convex arc segment located in the middle, and both ends of the outwardly convex arc segment are connected in sequence by a straight line segment and an oblique line segment, the end of the oblique line segment away from the straight line segment is inclined to the side away from the central axis of the tool holder; The combined cutting edge is arranged along the axial direction of the tool holder, the cutting edge portion is entirely concave within the outer circumferential surface of the tool holder, and the two straight line segments and the two oblique line segments are symmetrically arranged about the convex arc segment. The connection between the convex arc segment and the straight line segment, as well as the connection between the straight line segment and the oblique line segment, are all rounded. Each of the two oblique line segments has a concave arc blade at one end that is far apart from each other, and each concave arc blade has a smooth transition with its corresponding oblique line segment. The convex arc segment is formed on the drum-shaped segment located in the middle of the flank face, the straight segment is formed on the cylindrical segment of the flank face, and the oblique segment is formed on the conical segment of the flank face. The milling cutter processes the rolling surface, locking roller surface, and guide surface on the radial side of the square hole.

3. The milling cutter for machining the solid cage of a thrust cylindrical roller bearing according to claim 2, characterized in that: The cutting edge consists of three circumferentially distributed blades, with a chip removal groove provided between two adjacent cutting edges; the chip removal groove is a V-shaped groove; the rake face is one side wall of the chip removal groove.

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