Punched cage for tapered roller bearing, machining method and punch for machining

Abstract

The present application relates to a stamping retainer for tapered roller bearing, a processing method and a punch for processing, the stamping retainer for tapered roller bearing comprises an annular body provided integrally, a plurality of pockets are formed on the annular body, each pocket comprises two radially opposite sides and two axially opposite sides, each axially opposite side is sequentially provided with a lock roller surface and a rolling surface from outside to inside, which can ensure the rotation accuracy and dynamic balance accuracy of the bearing during use. The processing method of the stamping retainer for tapered roller bearing cancels the stretching process, and solves the problem of machining precision that the pocket punched by the retainer is damaged in the stretching process. The punch for processing the stamping retainer for tapered roller bearing can punch the structure of each surface in the pocket of the stamping retainer for tapered roller bearing at one time through the symmetrically arranged stamping surfaces, and has high machining precision and high processing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearings, in particular to a stamping retainer for tapered roller bearings, a processing method and a punch for processing. BACKGROUND

[0002] The conventional process of the existing tapered bearing stamping retainer is cutting material-forming-punching-pressing slope-extending to obtain the product, which is widely used. There is almost no problem in using such bearings for ordinary equipment. However, when such structure bearing retainers are used in important equipment such as precision machine tools, high-speed rail and steel mill rolling mills, the quality problems of high temperature rise, bearing damage, small end fracture of bearing retainer, commonly known as bottom drop, often occur. The quality problem of bearing rotation clockwise jamming and counterclockwise rotation in the assembly of the railway stamping tapered retainer often occurs. After research, it is found that the root cause of the quality problem of the stamping tapered retainer is the stretching process of the stamping process. The stretching process of the stamping retainer is to expand the root of the very qualified product, and the standard of expansion is to enable the rolling body to be loaded into all pockets from the inner diameter of the retainer and then loaded into the inner sleeve. The test amount of movement needs to be contracted back when the bearing is assembled, and the amount of movement reaches the design standard of the bearing. The actual purpose of the stretching of the stamping tapered retainer is to enable the rolling body to be loaded into the pocket of the retainer, and the rolling body is contracted on the inner ring of the bearing by the contraction of the retainer to form an inner assembly, so that the rolling body is kept in the rotation position of the inner raceway. However, various factors such as the expansion force of the expansion position, the manufacturing precision of the die, etc. can affect the uniformity of the expansion of each pocket of the retainer, especially the stretching process destroys the original window machining precision, the parallel precision of the bottom width, the conical angle precision, etc. of the retainer. During the assembly and riveting of the bearing, the precision of the stretching process cannot be restored to the original machining precision, and only the contraction can ensure that the clearance is qualified, because the stamping retainer is divided into many parts, and if one rolling body is not contracted in place or is contracted too much, it will cause the rolling body to be jammed, the bearing to rotate flexibly, etc. The assembly process can only provide a little external force to make the jammed rolling body rotate. Therefore, during the use of the user, the bearing rotation precision problem and the bearing rotation dynamic balance problem often occur.

[0003] In order to solve the problem of bearing rotation precision and bearing rotation dynamic balance during use, it is necessary to design a new tapered roller bearing retainer without stretching. SUMMARY

[0004] In view of the shortcomings of the prior art, the purpose of the present application is to provide a stamping retainer for tapered roller bearings, which is simple in structure, safe and reliable, and can ensure that the rotation precision and the bearing rotation dynamic balance of the bearing during use meet the use standard.

[0005] In order to achieve the above object, the present application adopts the following technical solutions:

[0006] The stamping retainer for the tapered roller bearing comprises an annular body provided integrally, a plurality of pockets are formed on the annular body, each pocket comprises two oppositely arranged radial sides and two oppositely arranged axial sides, wherein the two axial sides are matched with the outer circumferential surface of the tapered roller, the two radial sides are matched with the end surface of the tapered roller, and each axial side is sequentially provided with a roller locking surface and a rolling surface from outside to inside.

[0007] Further, the roller locking surface is provided with a guide surface away from the rolling surface.

[0008] Further, the rolling surface is a plane, and the plane is in linear contact with the tapered roller.

[0009] Further, the rolling surface is an inner concave arc surface, and the inner concave arc surface is in contact with the tapered roller surface.

[0010] Further, the roller locking surface is a straight surface, and the roller locking surface is in linear contact with the outer circumferential surface of the tapered roller.

[0011] Further, the guide surface is an inclined surface inclined away from the roller locking surface.

[0012] Further, the rolling surface and the roller locking surface are smoothly connected.

[0013] Further, the rolling surface and the roller locking surface are smoothly connected.

[0014] Further, the four corners of the pocket are provided with a circular arc transition in the radial direction.

[0015] Further, a cross beam is arranged between adjacent pockets, the axial side is formed on the cross beam, and the roller locking surface and a boss are formed on the outer diameter side of the cross beam.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The stamping retainer for the tapered roller bearing comprises an annular body provided integrally, a plurality of pockets are formed on the annular body, each pocket comprises two oppositely arranged radial sides and two oppositely arranged axial sides, wherein the two axial sides are matched with the outer circumferential surface of the tapered roller, the two radial sides are matched with the end surface of the tapered roller, and each axial side is sequentially provided with a roller locking surface and a rolling surface from outside to inside. Its structure is simple, safe and reliable, and can ensure the rotation accuracy and dynamic balance accuracy of the bearing during use.

[0018] Another object of the present application is to provide the above-mentioned stamping cage machining method for tapered roller bearings, which punches the pockets on the annular body of the cage by using a forming pressure punch after the punching process, so that not only the circular arc slope for guiding the rolling body is punched, but also the convex boss for locking the rolling body in a linear type is punched at the outer end of the circular arc slope, so that the rolling body can be directly loaded into the circular arc slope of the cage from the outer diameter of the cage and contacted with the raceway of the inner ring, thereby ensuring the accurate rotational play.

[0019] The present application provides a stamping cage machining method for tapered roller bearings, which has a simple process flow, cancels the stretching process, solves the problem of machining precision that the pockets punched in the cage are damaged in the stretching process, and especially eliminates the need for making a die to shrink the cage in the bearing assembly process.

[0020] Another object of the present application is to provide the above-mentioned stamping cage machining method for tapered roller bearings, which punches the pockets on the annular body of the cage by using a forming pressure punch after the punching process, so that not only the circular arc slope for guiding the rolling body is punched, but also the convex boss for locking the rolling body in a linear type is punched at the outer end of the circular arc slope, so that the rolling body can be directly loaded into the circular arc slope of the cage from the outer diameter of the cage and contacted with the raceway of the inner ring, thereby ensuring the accurate rotational play.

[0021] Further, the first inclined surface and the straight surface are smoothly connected, the straight surface and the convex circular arc surface are smoothly connected, the convex circular arc surface and the second inclined surface are smoothly connected, and the front surface and the small end surface are connected by a circular arc.

[0022] Further, the front end of the rod body is provided with a relief groove corresponding to the front surface of the punch, and the rod body is provided with a relief surface corresponding to the punching surface of the two punches.

[0023] The punch for stamping cage machining for tapered roller bearings of the present application can punch the structure of each surface in the pocket of the stamping cage for tapered roller bearings at one time through the symmetrically arranged punching surfaces, has high machining precision and high machining efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the AA-direction structure;

[0026] Figure 3 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the main structure of the punch according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the left-side structure of the punch according to an embodiment of the present invention;

[0029] Figure 6 This is a top view of the punch according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the three-dimensional structure of the punch according to an embodiment of the present invention.

[0031] In the figure: 1. Annular body, 2. Pocket, 3. Rolling surface, 4. Locking roller surface, 5. Guide surface, 6. Crossbeam, 7. Boss, 9. Punch, 91. Front surface, 92. Rear surface, 93. Stamping surface, 94. Small end face, 95. Large end face, 96. Arc transition, 97. First inclined surface, 98. Outwardly convex arc surface, 99. Second inclined surface, 100. Straight surface, 10. Rod, 11. Clearance slot, 12. Clearance surface. Detailed Implementation

[0032] 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.

[0033] Example 1

[0034] like Figures 1-3 As shown, a stamped cage for tapered roller bearings includes an integrally formed annular body 1. The small-diameter end of the annular body 1 is provided with an inwardly protruding radial flange. The annular body 1 is provided with a plurality of pockets 2 adapted to the tapered rollers. Each pocket 2 includes two radially arranged sides and two axially arranged sides, wherein the two axial sides are adapted to the outer peripheral surface of the tapered rollers, and the two radial sides are adapted to the end face of the tapered rollers. Each axial side is provided with a locking roller surface 4 and a rolling surface 3 from the outside to the inside.

[0035] It should be noted that the punched retainer for the tapered roller bearing of the present embodiment has a simple structure, is safe and reliable, the cage hole 2 is provided with a roller locking surface 4, which can lock the roller in the rolling surface 3, prevent the rolling body from falling from the outside, and can ensure the rotation accuracy and dynamic balance of the bearing during use.

[0036] Specifically, the rolling surface 3 of the present embodiment is a plane, and the plane is in line contact with the tapered roller. It has a simple structure and is easy to process.

[0037] In another embodiment, the rolling surface 3 is a concave arc surface, which is in contact with the tapered roller surface. When in use, the rolling surface 3 and the tapered roller surface are in contact to improve the stability of the bearing operation.

[0038] The roller locking surface 4 is a straight surface. The roller locking surface 4 is in line contact with the outer peripheral surface of the tapered roller. It has a simple structure and is easy to process, and can improve the stability of the bearing operation when in use.

[0039] In order to facilitate the installation of the tapered roller from the outside into the cage hole 2, the guide surface 5 is provided on the side of the roller locking surface 4 away from the guide surface 5. Specifically, the guide surface 5 is an inclined surface inclined away from the roller locking surface 4. The guide angle is formed between the two opposite guide surfaces in the cage hole.

[0040] In order to ensure the rapid installation of the tapered roller and avoid scratching during installation, the rolling surface 3 and the roller locking surface 4 are smoothly transitioned.

[0041] In order to ensure the free rolling of the tapered roller and the stable operation of the bearing, the four corners of the cage hole 2 of the present embodiment are provided with a circular arc transition in the radial direction.

[0042] It should be noted that the present embodiment is provided with a cross beam 6 between adjacent cage holes 2, the axial side is formed on the cross beam 6, and the roller locking surface 4 is formed on the boss on the outer diameter side of the cross beam 6. The width of the roller locking boss of the present embodiment is 0.5mm, and the locking amount is 0.15~0.2mm. The rolling body is pressed into the cage hole 2 window by the elastic deformation of the retainer, which ensures that the roller is installed from the outer diameter and does not fall out from the outer diameter, which is convenient and fast.

[0043] Embodiment 2

[0044] As Figures 4-6As shown, the punch for machining the stamping retainer of the tapered roller bearing is used for machining the stamping retainer of the tapered roller bearing in Example 1, and includes a rod body 10 and a punch head 9 arranged at the front end of the rod body 10. The rod body 10 is in the shape of a cuboid, and the punch head 9 includes a front surface 91 and a rear surface 92 arranged oppositely and in the shape of a trapezoid, two stamping surfaces 93 connected to the long sides of the front surface 91 and the rear surface 92 respectively, and two end surfaces connected to the short sides of the front surface 91 and the rear surface 92 respectively. The two end surfaces include a small end surface 94 away from the rod body 10 and a large end surface 95 close to the rod body 10. The front surface 91 is inclined from the small end surface 94 to the large end surface 95. Each stamping surface 93 is inclined from the front surface 91 to the rear surface 92, i.e., the area of the front surface 91 is larger than that of the rear surface 92. Each stamping surface 93 is sequentially provided with a first inclined surface 97, a straight surface 100, an outward convex arc surface 98, and a second inclined surface 99 from the front surface 91 to the rear surface 92. The outward convex arc surface 98 corresponds to an axis parallel to the rear surface 92. The two first inclined surfaces 97 are away from the ends of the outward convex arc surface 98, and the two second inclined surfaces 99 are away from the ends of the outward convex arc surface 98. It should be noted that the first inclined surface is matched with the guide surface of the pocket, the straight surface is formed on the straight platform between the first inclined surface and the outward convex arc surface, the straight surface is matched with the roller locking surface of the pocket, and the outward convex arc surface is matched with the rolling surface of the pocket.

[0045] In order to ensure the accuracy of the axial side surface of the pocket after machining, the first inclined surface 97, the straight surface 100, the outward convex arc surface 98, and the second inclined surface 99 are smoothly connected. The front surface 91 and the outer end surface 94 are smoothly connected at the connection position 96.

[0046] It should be noted that the arc transition 96 in this embodiment is an arc chamfer to ensure that the punch can smoothly enter the small end of the retainer window. The first inclined surface is designed to allow the small end of the punch to enter the small end of the retainer window first and then allow the large end of the punch to enter the large end of the retainer window. The structure is relatively reasonable, facilitating stamping, and is conducive to improving the accuracy of stamping.

[0047] In order to facilitate stamping, the front end of the rod body 10 and the corresponding surface of the front surface 91 are provided with a clearance groove 11, the front end of the rod body 10 and the corresponding surface of the front surface 91 of the punch head 9 are provided with a clearance groove 11, and the sides of the rod body 10 corresponding to the stamping surfaces 93 of the two punch heads 9 are provided with clearance surfaces 12. Each clearance surface 12 extends obliquely from the front end of the rod body 10 to the tail end of the rod body 10. It should be noted that the second inclined surface 99 is also a clearance surface to facilitate stamping.

[0048] The punch for processing the stamping retainer of the tapered roller bearing of the present application punches out the guide surface of the pocket hole through the symmetrically arranged first inclined surface 97, punches out the locking roller surface of the pocket hole through the straight surface 100, and punches out the rolling surface of the pocket hole through the outward convex circular arc surface 98, that is, the punch can punch out the structure of each surface in the pocket hole of the stamping retainer of the tapered roller bearing at one time, the machining precision is high, the machining efficiency is high, one stretching process for processing the retainer is reduced, the manufacturing cost of the retainer is reduced, the original machining precision of the retainer is ensured, the stamping shrinking process in the finished product assembly workshop can be cancelled, the finished product can be removed from the press, precise assembly, bearing detection and inspection can be performed, and the bearing quality is improved.

[0049] Embodiment 3

[0050] The present embodiment provides the processing method for the stamping retainer of the tapered roller bearing in embodiment 1, after the punching process, the pocket hole on the annular body of the retainer is punched by the forming pressure slope punch, so that not only the circular arc slope surface for guiding the rolling body is pressed out, but also the linear locking rolling body boss can be pressed out at the outer end of the circular arc slope surface, so that the rolling body can be directly assembled into the circular arc slope of the retainer from the outer diameter of the retainer and contact with the inner ring raceway, and the accurate rotation play is ensured. The original stretching process is cancelled, so that the retainer does not need to be shrunk by the press during bearing assembly, not only the process is shortened, but also the accurate bearing play is ensured, and the static rotation accuracy and dynamic rotation accuracy of the bearing are ensured.

[0051] The processing method for the stamping retainer of the tapered roller bearing provided by the present application has a simple process flow, cancels the stretching process, solves the problem of machining precision that the pocket hole punched by the retainer is damaged in the stretching process, and especially the stretching process is not needed to make a shoe to shrink the retainer during the bearing assembly process. The present application is convenient to operate, has high machining efficiency and high precision.

[0052] It should be noted that the forming pressure slope punch of the present embodiment is the punch for processing the stamping retainer of the tapered roller bearing in embodiment 2. In addition, the present embodiment has the beneficial effects of embodiment 1 and embodiment 2.

[0053] It should be noted that the part not described in detail in the present application is prior art.

[0054] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0055] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0056] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "connecting", "fixing", "screwed", and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the first feature is lower in horizontal height than the second feature.

[0058] It is to be understood that the terms "including", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0059] In the description of the present application, the terms "including" and / or "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0060] While the above-described embodiments of the application have shown and described, it is to be understood that the application can be embodied in various other forms, and that the embodiments described herein are to be considered in all respects as illustrative only, rather than restrictive. The scope of the application is indicated by the appended claims, and all changes which come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. A punch for processing a punched cage for a tapered roller bearing, characterized by: The punch includes a rod body and a punch head arranged at the front end of the rod body, the punch head includes oppositely arranged trapezoidal front and rear surfaces, two stamping surfaces connected with the long sides of the front and rear surfaces respectively, and two end surfaces connected with the short sides of the front and rear surfaces respectively, the two end surfaces include a small end surface away from the rod body and a large end surface close to the rod body, the front surface is inclined from the small end surface to the large end surface, each stamping surface is inclined from the front surface to the rear surface, and each stamping surface is sequentially provided with a first inclined surface, a straight surface, an outward convex arc surface and a second inclined surface from the front surface to the rear surface, the two first inclined surfaces are large ends away from the straight surface, and the two second inclined surfaces are small ends away from the outward convex arc surface.

2. The punch for processing the stamped retainer for a tapered roller bearing according to claim 1, characterized by: The first inclined surface and the straight surface and the straight surface and the outward convex arc surface are smoothly connected, the outward convex arc surface and the second inclined surface are smoothly connected, and the front surface and the small end surface are connected by an arc.

3. The punch for processing the stamping cage for a tapered roller bearing according to claim 1, characterized in that: The front end of the rod body is provided with a relief notch on the surface corresponding to the front surface of the punch head, and the rod body is provided with a relief surface on the side surface corresponding to the stamping surface of the two punch heads, and each relief surface is inclined and extended from the front end of the rod body to the tail end of the rod body.

4. A stamped retainer for a tapered roller bearing, characterized by: The punch is manufactured by using the punch according to any one of claims 1 to 3, and includes an annular body provided integrally, a plurality of pockets are formed in the annular body, each pocket includes two oppositely arranged radial sides and two oppositely arranged axial sides, the two axial sides are matched with the outer circumferential surface of the tapered roller, the two radial sides are matched with the end surface of the tapered roller, each axial side is sequentially provided with a lock roller surface and a rolling surface from outside to inside, and the lock roller surface is provided with a guide surface away from the rolling surface.

5. The stamped retainer for a tapered roller bearing according to claim 4, characterized in that: The rolling surface is a plane, and the plane is in line contact with the tapered roller.

6. The stamped retainer for a tapered roller bearing according to claim 4, characterized in that: The rolling surface is an inwardly recessed arc surface, and the inwardly recessed arc surface is in surface contact with the tapered roller.

7. The stamped retainer for a tapered roller bearing according to claim 4, characterized in that: The lock roller surface is a straight surface, and the lock roller surface is in line contact with the outer circumferential surface of the tapered roller; and the guide surface is an inclined surface inclined away from the lock roller surface.

8. The stamped retainer for a tapered roller bearing according to claim 7, characterized in that: The rolling surface and the lock roller surface are smoothly connected, the rolling surface and the lock roller surface are smoothly connected, and the four corners of the pocket are provided with arc transitions in the radial direction.

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