CN109899397B

CN109899397B - Retainer of deep groove ball bearing and deep groove ball bearing

Info

Publication number: CN109899397B
Application number: CN201910271871.XA
Authority: CN
Inventors: 郑广会; 赵培振
Original assignee: Shandong Golden Empire Precision Machinery Technology Co Ltd
Current assignee: Shandong Golden Empire Precision Machinery Technology Co Ltd
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2024-03-22
Anticipated expiration: 2039-04-04
Also published as: CN109899397A

Abstract

The retainer of the deep groove ball bearing comprises a pair of retainer bodies (11) which are of symmetrical structures, each retainer body comprises pocket portions (12) which are arranged at equal intervals along the circumferential direction of the retainer bodies and connecting portions (14) which are connected between the pocket portions, the pocket portions corresponding to the retainer bodies can form pocket holes (13) of the retainer, the corresponding connecting portions are connected through butt welding seams (16), welding grooves of the butt welding seams (16) are formed at the connecting positions of the connecting portions and the pocket portions, and groove surfaces (152) of the welding grooves are arc convex surfaces. Through welding, the retainer can not have the clearance, avoids the noise of operation, and provides the welding area in suitable position, is fit for the solder filling, ensures welding quality, keeps the appearance pleasing to the eye. In addition, the retainer can optimize the production process. The deep groove ball bearing with the retainer is also provided.

Description

Retainer of deep groove ball bearing and deep groove ball bearing

Technical Field

The invention belongs to the technical field of bearing parts, and particularly relates to a retainer of a deep groove ball bearing. The invention also relates to a deep groove ball bearing with the retainer.

Background

The rolling bearing structure generally includes an inner ring, an outer ring, a bearing retainer, and rolling elements. The bearing retainer functions as: guiding and driving the rolling bodies to roll on a correct rollaway nest; meanwhile, the rolling bodies are equidistantly spaced and uniformly distributed on the circumference of the roller path so as to prevent the rolling bodies from collision and friction during working. A deep groove ball bearing is one type of rolling bearing and is generally composed of an outer ring, an inner ring, a set of steel balls, and a cage.

The bearing retainer of the existing deep groove ball bearing is usually riveted together by two symmetrical frame bodies through rivets. Specifically, each rivet needs to be riveted one by using an electric riveting machine, and a die for riveting the rivets consists of an upper punch and a lower punch. The upper punch is a working punch and is manufactured by adopting materials such as high-speed steel or hard alloy and the like when being subjected to high temperature and high pressure during riveting. The lower punch is a supporting punch, and is required to have conductivity, and to be in good contact with a rivet head, and is manufactured from high-quality low-carbon steel or brass. During electric riveting, the upper punch is installed in a clamp below the cylinder of the electric riveting machine, and the lower punch is installed on a workbench of the electric riveting machine and corresponds to the upper punch in position. When riveting, the rivet rod is positioned on the upper punch and the lower punch, a rivet is matched with the upper punch and the lower punch, current is conducted, the upper end of the rivet rod is heated to a proper temperature, then the upper punch falls down to form a rivet head, and the retainer is riveted. The riveting process has the following disadvantages: 1. after the two frame bodies are riveted, gaps are more or less reserved between the frame bodies, so that a certain noise can be generated when the bearing works; 2. the two frame bodies are riveted, so that certain equipment and corresponding workload are needed, and the production cost is increased; 3. when the rivet is not vertical to the plane, the frame body can generate radial movement, and the rivet is easy to fall off; 4. the rivet is installed to have certain degree of difficulty, frequently takes place to fall the nail problem, influences the work progress.

Disclosure of Invention

An object of the present invention is to provide a cage for a deep groove ball bearing, which is capable of preventing working noise by welding a connecting frame body so that the cage does not have a gap, and providing a welding area at a proper position, suitable for filling with solder, ensuring welding quality, and maintaining an attractive appearance. In addition, the retainer can simplify the production process and improve the production efficiency and quality.

Another object of the present invention is to provide a deep groove ball bearing having the above-mentioned cage.

The invention provides a retainer of a deep groove ball bearing, which comprises a pair of frame bodies in a symmetrical structure, wherein each frame body comprises pocket parts and connecting parts, the pocket parts are arranged at equal intervals along the circumferential direction of the frame bodies, the connecting parts are connected with each other, the pocket parts corresponding to the pair of frame bodies can form pockets of the retainer, the corresponding connecting parts are connected through butt welding seams, welding grooves of the butt welding seams are formed at the connecting parts of the connecting parts and the pocket parts, and the groove surfaces of the welding grooves are arc convex surfaces. The arc convex surface can provide a proper welding area, is suitable for filling solder, ensures welding quality and can keep attractive appearance. And the welding structure can avoid the existence of gaps of products and avoid the generation of working noise. In addition, after the welding structure is adopted, the structure of the retainer body can be simplified, the production process is simplified, and the production efficiency and quality are improved.

In an exemplary embodiment of the cage of the deep groove ball bearing, the angle between the connection lines between the starting position and the end position of two corresponding groove surfaces in the cross section of the butt weld is α,60 ° or more α or less than 80 °. The welding efficiency can be improved by more than 60 degrees, the problem that the heat stress is concentrated can not be caused because the heat stress is shorter in the time of being exposed to a high-temperature environment is avoided, the welding strength can be ensured by less than 80 degrees, and the service life and the reliability of the bearing are improved.

In an exemplary embodiment of the cage of the deep groove ball bearing, the angle α further satisfies the condition: alpha is 67-73 deg.

In an exemplary embodiment of the cage of the deep groove ball bearing, the thickness of the connecting portion is D, and in the cross section of the butt weld, the distance from the starting position of the groove surface to the ending position thereof is L in the height direction of the butt weld, and the height of the butt weld is H, wherein D is less than or equal to H is less than or equal to 0.8L. The ball can be guaranteed to freely rotate in the pocket, meanwhile, the firmness of the welded retainer can be guaranteed on the basis of saving welding flux, the risk that the mechanical performance is affected is reduced, and the process standard of metal welding engineering is met.

In an exemplary embodiment of the cage of the deep groove ball bearing, the thickness D of the connecting portion, the height H of the butt weld, the distance L from the starting position of the groove face to the ending position thereof in the height direction of the butt weld, further satisfy the condition: h is more than or equal to 1.1 and less than or equal to 0.7L.

In an exemplary embodiment of the cage of the deep groove ball bearing, two cage bodies which are in butt joint with each other are respectively provided with a first mark and a second mark corresponding to the first mark. The consistency of the welded retainer can be ensured.

In an exemplary embodiment of the cage of the deep groove ball bearing, the first marking and the second marking are respectively arranged on the mutually corresponding connecting parts and are located on the same side facing towards or away from the axial center of the cage. The butt joint and detection of the retainer can be more convenient.

The invention also provides a deep groove ball bearing which comprises an outer ring, an inner ring, the retainer and a plurality of balls. The retainer is received between the outer race and the inner race. The balls are respectively arranged in the pockets of the retainer.

The above features, technical features, advantages and implementation of the cage of the deep groove ball bearing and the deep groove ball bearing will be further described in a clear and understandable manner with reference to the accompanying drawings.

Drawings

The following drawings are only illustrative of the invention and do not limit the scope of the invention.

Fig. 1 is a schematic view for explaining a structure of an exemplary embodiment of a cage of a deep groove ball bearing.

FIG. 2 is a schematic A-A cross-sectional view of the cage of the deep groove ball bearing of FIG. 1.

Fig. 3 is a partially enlarged schematic view illustrating a cage of the deep groove ball bearing shown in fig. 2.

Fig. 4 is a schematic diagram illustrating an exemplary embodiment of a deep groove ball bearing.

Description of the reference numerals

10. Retainer

11. Frame body

12. Pocket portion

13. Pocket hole

14. Connecting part

15. Weld groove

152. Groove surface

16. Butt weld

17. First sign

18. Second sign

20. Outer ring

30. Inner ring

40. Ball bearing

Detailed Description

For a clearer understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals refer to identical or structurally similar but functionally identical components throughout the separate views.

In this document, "schematic" means "serving as an example, instance, or illustration," and any illustrations, embodiments described herein as "schematic" should not be construed as a more preferred or advantageous solution.

For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. In addition, for simplicity and ease of understanding, components having the same structure or function in some of the figures are shown schematically only one of them, or only one of them is labeled.

In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

Fig. 1 is a schematic view for explaining a structure of an exemplary embodiment of a cage of a deep groove ball bearing. FIG. 2 is a schematic A-A cross-sectional view of the cage of the deep groove ball bearing of FIG. 1. As shown in fig. 1 and 2, the cage 10 of the deep groove ball bearing includes a pair of cage bodies 11 having a symmetrical structure. Each frame 11 includes pocket portions 12 disposed equidistantly along the circumferential direction thereof and connection portions 14 connected between the pocket portions 12, i.e., as shown in fig. 1, the pocket portions 12 are disposed equidistantly along the circumferential direction of the frame 11, and the connection portions 14 are also disposed equidistantly.

As shown in fig. 2, in the pair of frame bodies 11, the corresponding pocket portions 12 can form pockets 13 of the cage, and the pockets 13 can be used for mounting and holding balls 40 (see fig. 4) of the deep groove ball bearing; the corresponding connection portions 14 are connected by butt welds 16, and the connection portions 14 and the pocket portion 13 form weld grooves 15 of the butt welds 16 (the butt welds are omitted in the position marked with the weld grooves 15 for clarity of the structure of the holder), and the groove surfaces 152 of the weld grooves 15 are arc convex surfaces. (see also FIG. 3)

Since the weld groove 15 of the butt weld 16 is formed at the connection portion of the connection portion 14 and the pocket portion 13, and the groove surface 152 of each weld groove 15 is a circular arc convex surface, that is, a circular bead transition, a welding area is formed between two opposite circular arc convex surfaces, that is, as shown in fig. 3, the welding area (an area surrounded by a connection line between two O points and two groove surfaces 152 in the drawing) can be formed from the starting position O to the ending position F (the meeting and positions of two corresponding groove surfaces 152) of the two groove surfaces 152, and the butt weld 16 can be set in the range of the welding area in the welding process. Since the bonding area is approximately V-shaped, it is particularly suitable for filling with solder, and the bonding quality can be ensured. Meanwhile, the design is less influenced by the size of the retainer, and the practicability is high. And the butt weld 16 is positioned in the welding area, so that the appearance of the retainer is not affected, and the overall aesthetic property of the product is facilitated.

And the whole retainer is not connected by adopting rivets, but is connected together in a welding mode, so that no gap exists between the retainer bodies 11, the noise of the bearing in working is reduced, and the problem that the retainer bodies 11 move radially and the rivets fall off to cause the disassembly of the retainer can be avoided.

In addition, the frame 11 has a completely symmetrical structure and a simple structure, and the corresponding manufacturing mold is also simple in structure. For example, in some embodiments, the frame body may be in an integrally formed structure, so that the stamping operation of the frame body 11 can be completed by using one set of die, which simplifies the processing technology, improves the production efficiency, ensures the production progress, reduces the production cost, and increases the production benefit. And each part of the integrally formed frame body 11 is in curve transition, and structures such as any protrusion, groove or through hole are not arranged, so that the whole frame body 11 has no stress dead angle, deformation, crack and even fracture of the frame body 11 at the stress concentration position are avoided, and the yield of part production is ensured.

In one embodiment of the cage of the deep groove ball bearing shown in fig. 3, the angle between the lines between the starting and ending positions of two corresponding beveled surfaces 152 is alpha, such that 60 deg. alpha. 80 deg. in the cross section of the butt weld 16. Since the pair of frame bodies of the retainer are in a symmetrical structure, a connecting line between the starting position and the ending position of the two corresponding groove surfaces 152 and a connecting line between the starting positions of the two corresponding groove surfaces 152 can form an isosceles triangle, and the top foot regions of the isosceles triangle form the filling portion of the solder. In the deep groove ball bearing with the same specification, the size of the steel ball is definite, and correspondingly, the diameter of the ball pocket matched with the steel ball is also fixed, which means that the bottom edge position and the bottom edge length of the isosceles triangle are unchanged. The magnitude of the apex angle α thus directly influences the depth of the weld zone 5: the top angle becomes larger, and the depth of the corresponding welding area becomes shallower; the apex angle becomes smaller and the depth of the corresponding welded area becomes deeper. Due to the varying depth of the weld area, there is a resultant variation in the solder fillable amount and height of the butt weld 16. The crown angle becomes larger, the fillable amount of solder decreases, and the height of the butt weld 16 decreases; the apex angle becomes smaller, the fillable amount of solder increases, and the height of the butt weld 16 increases.

Meanwhile, the height of the welding seam 16 is low, the welding time is short in the welding process, the retainer has smaller penetration under the premise of ensuring penetration, and correspondingly, the high-temperature influence area of the retainer is small, so that the maintenance of the metal performance and the dimensional parameters of the retainer is facilitated. Of course, too little solder, and the solder firmness is correspondingly reduced. The height of the weld 16 is high, and the welding flux is much, so that the welding time is long in the welding process, and the retainer has larger penetration under the premise of ensuring penetration, and correspondingly, the high-temperature influence area of the retainer is enlarged, so that the maintenance of the metal performance and the dimensional parameters of the retainer is not facilitated. Of course, the solder increases, and the soldering firmness is correspondingly improved. Therefore, the selection of the alpha being more than or equal to 60 degrees and less than or equal to 80 degrees is quite proper, the welding efficiency can be improved by more than 60 degrees, the problem of heat stress concentration can not be caused due to shorter exposure time in a high-temperature environment, the welding strength can be ensured by less than 80 degrees, and the service life and the reliability of the bearing can be improved. Wherein, in one embodiment, the conditions may be further preferred: the angle range is 67 degrees or more and 73 degrees or less, the welding flux dosage is moderate, the height of the butt welding seam 16 is proper, and the welding efficiency is high; the effect on the performance and parameters of the retainer is small due to the proper welding time; meanwhile, the welding firmness is optimal, and the bearing is ensured to have good operation reliability.

Referring to fig. 3, the thickness of the connecting portion is D, and in the cross section of the butt weld 16, the distance from the start position of the groove surface 152 to the end position thereof is L, and the height of the butt weld 16 is H, along the height direction of the butt weld 16. Considering that the balls need to be ensured to freely rotate in the pocket 13 after the cage is welded, the butt weld 16 can never exceed the welding area to interfere with the ball moving space in the pocket 13; meanwhile, the firmness of the welded retainer is ensured, the use principle of saving welding flux is also needed, the possibility of aggravation of risks of influenced mechanical properties of the retainer caused by overhigh height of the butt welding seam 16 is also considered, and the process standard of metal welding engineering is combined, wherein the scheme needs to meet the following conditions: d is more than or equal to H and less than or equal to 0.8L. In a preferred embodiment, the conditions may further be: h is more than or equal to 1.1 and less than or equal to 0.7L.

In one embodiment of the cage of the deep groove ball bearing shown in fig. 3, a first mark 17 and a second mark 18 corresponding to the first mark 17 are respectively provided on two mutually abutting cage bodies 11. Because the holder is formed by welding two symmetrical frame bodies 11 which are mutually butted, in order to ensure the consistency of the welded holder, the two frame bodies 11 are required to be accurately butted before welding, the accuracy of the butt joint can be ensured by arranging the first mark 17 and the second mark 18, and the detection after welding is convenient. To further facilitate docking and inspection, the first and second markers 17, 18 can be provided on the mutually docked connection portions 14 on the same side towards or away from the cage axis, respectively. After the abutment, the end of the first sign 17 and the second sign 18 are closely fitted toward the end of the first sign 17. In this embodiment, the first mark 17 is disposed on the connection portion 14 of the left frame 11, and the second mark 18 is disposed on the connection portion 14 of the right frame 11, which are bar-shaped marks with distinct colors. After the left frame body is in butt joint with the right frame body, the two connecting parts 14 are attached, whether the first mark 17 and the second mark 18 are aligned or not is observed, and then the accuracy of the butt joint of the two frame bodies 11 can be easily judged. After welding, quality inspection personnel can also rapidly and accurately judge whether the welding result of the two frame bodies 1 is qualified according to whether the first mark 17 and the second mark 18 are aligned. Of course, those skilled in the art will appreciate that the first identifier 17 and the second identifier 18 may be provided by any known means of identification and are not limited to those shown in the figures.

The invention also provides a deep groove ball bearing, which comprises an outer ring 20, an inner ring 30, a retainer 10 and a plurality of balls 40, wherein the retainer 10 is received between the outer ring 20 and the inner ring 30. The balls 40 are respectively disposed in the pockets 13 of the cage 10.

It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The above list of detailed descriptions is only specific to practical examples of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications, such as combinations, divisions or repetitions of features, without departing from the technical spirit of the present invention are included in the scope of the present invention.

Claims

1. The cage of deep groove ball bearing, its characterized in that, it includes:

a pair of frame bodies (11) with symmetrical structures, wherein each frame body (11) comprises pocket portions (12) which are equidistantly arranged along the circumferential direction of the frame body and connecting portions (14) which are connected between the pocket portions (12), the pocket portions (12) corresponding to the pair of frame bodies (11) can form the pocket (13) of the retainer, the corresponding connecting portions (14) are connected through butt welding seams (16), welding grooves (15) of the butt welding seams (16) are formed at the connecting positions of the connecting portions (14) and the pocket portions (12), and groove surfaces (152) of the welding grooves (15) are arc-shaped convex surfaces;

in the cross section of the butt welding seam (16), an included angle between connecting lines between the starting position and the ending position of two corresponding groove surfaces (152) is alpha, and alpha is more than or equal to 60 degrees and less than or equal to 80 degrees; the frame body (11) is of an integrated structure.

2. The cage of claim 1 wherein the included angle α further satisfies the condition: alpha is 67-73 deg.

3. Cage according to claim 1, wherein the connecting portion has a thickness D and, in the cross section of the butt weld (16), the distance from the starting position of the bevel face (152) to its ending position is L in the height direction of the butt weld (16), the height of the butt weld (16) is H,

wherein, D is more than or equal to H and less than or equal to 0.8L.

4. A cage according to claim 3, wherein the thickness D of the connecting portion, the height H of the butt weld, the distance L from the start position of the groove surface to the end position thereof in the height direction of the butt weld, further satisfy the condition: h is more than or equal to 1.1 and less than or equal to 0.7L.

5. Cage according to claim 1, characterized in that the two frames (11) abutting against each other are provided with a first marking (17) and a second marking (18) corresponding to the position of the first marking (17), respectively.

6. Cage according to claim 5, characterized in that the first marking (17) and the second marking (18) are provided on the mutually corresponding connecting portions (14) on the same side facing or facing away from the cage axis.

7. The deep groove ball bearing, its characterized in that includes:

an outer race (20);

an inner ring (30);

a cage (10) according to any one of claims 1 to 6, which is received between said outer ring (20) and said inner ring (30); and

and a plurality of balls (40), wherein each ball (40) is respectively arranged in each pocket (13) of the retainer (10).