Large tapered roller bearing retainer shrinkage die
By improving the material and structure of the upper die and adopting a combination structure of nylon inner ring and steel outer ring, the problem of indentation during cage assembly was solved, thereby improving the lifespan of the cage and bearing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-04-10
AI Technical Summary
During the assembly process of existing large tapered roller bearings, indentations are easily formed when the upper die presses against the upper end face of the cage, which increases the internal stress of the cage, reduces its service life, and affects the bearing quality.
The upper mold structure consists of a nylon inner ring and a steel outer ring. The nylon inner ring serves as the working part, while the steel outer ring provides support to prevent indentations. Uniform shrinkage is achieved through the frustoconical cavity of the lower shrink mold, forming an inseparable inner component.
It eliminates indentations on the cage end face, improves the overall lifespan of the cage and bearing, and enhances the quality of the bearing.
Smart Images
Figure CN224107574U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to bearing retainer, concretely is a large -scale tapered roller bearing retainer contraction mould. BACKGROUND
[0002] Large -scale tapered roller bearings generally adopt steel plate stamping basket -shaped retainer, before bearing assembly, first, the retainer's pocket hole is loaded with roller, then is loaded into the inner ring, and the inner assembly is formed, generally, the tapered roller bearing designs non - working small curb on the inner ring, the function of small curb is to make the inner ring, roller and retainer become an inseparable assembly, so as to facilitate the installation and use of bearing, this assembly is the inner assembly, but due to the existence of small curb, the retainer manufactured according to product drawing cannot directly carry out bearing assembly, for this reason, the basket -shaped retainer must be expanded after stamping forming and before assembly, after the expansion of the retainer, the roller and the inner ring are loaded, should guarantee the assembly clearance, the total clearance should not exceed 0.4mm, and the expansion should be uniform, in this way, after loading the roller, the roller can be smoothly loaded into the inner ring with small curb, then the contraction mould is used to contract it to the product drawing specified finished product size.
[0003] The contraction mould used in the prior art is as shown in Figure 3 The working principle is that the upper die head is given force by the press, the upper die is stressed, the upper die makes the retainer stressed deformation, due to the cavity of the lower contraction mould, the retainer is contracted to the size before expansion, that is, the product drawing size, and the retainer, the inner ring and the roller become inseparable inner assembly, but analyzing the prior art can find that when the upper die presses the upper end surface of the retainer, the retainer is prone to indentation, these indentations can increase the internal stress of the retainer, causing the service life of the retainer to be reduced, in the railway bearing industry, the service life of the bearing is the key index of bearing quality, based on this, it is necessary to improve it. UTILITY MODEL CONTENTS
[0004] In view of the problems in the background art, the utility model aims at providing a large -scale tapered roller bearing retainer contraction mould, which improves the material and structure of the upper die to avoid the indentation of the retainer during the assembly of the bearing inner assembly, thereby further improving the overall quality of the bearing.
[0005] To achieve the above object, the utility model adopts the following technical scheme:
[0006] A large taper roller bearing cage assembly shrinkage mold, comprising an upper die and a lower shrinkage mold, the upper die comprises a nylon inner ring and a steel outer ring, the nylon inner ring is composed of a ring flat plate, an inner pressing ring and an external ring, the ring flat plate is connected with an upper die pressing head on the upper end face, the inner pressing ring is integrally connected outside the lower end hole of the inner hole of the ring flat plate, and the external ring is integrally connected at the lower end face of the ring flat plate, wherein the inner diameter and the outer diameter of the inner pressing ring are consistent with the large end of the pressed cage; the steel outer ring is fixedly sleeved outside the external ring; and the lower shrinkage mold is arranged below the upper die.
[0007] The shrinkage cavity of the lower shrinkage mold is a truncated cone cavity with a large upper end and a small lower end.
[0008] The lower end of the side wall of the inner hole of the steel outer ring is provided with an annular stopper, and the upper end face of the annular stopper covers and is fixedly connected with the lower end face of the external ring.
[0009] The upper end face of the steel outer ring is flush with the upper end face of the ring flat plate.
[0010] The height of the inner pressing ring is greater than the height of the external ring.
[0011] The lower end face of the inner pressing ring is provided with a rounded corner on both sides, and the radius R of the rounded corner is greater than or equal to 5mm.
[0012] The utility model has the following beneficial effects: the utility model improves the material and structure of the upper die, the nylon inner ring and the steel outer ring are used in the working part of the upper die, the nylon inner ring is prevented from warping and deforming, the service life of the upper die is ensured, the die eliminates the indentation on the end face of the bearing inner assembly during assembly, and the overall service life of the cage and the bearing is correspondingly improved. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is the overall structure front view of the utility model.
[0014] Figure 2 It is the front view of the upper die.
[0015] Figure 3 It is the front view of the shrinkage mold used in the prior art.
[0016] In the drawing, 1 is a lower shrinkage mold, 2 is an upper die, 3 is a cage, 4 is a taper roller, 5 is a bearing inner ring, 6 is a nylon inner ring, 7 is a ring flat plate, 8 is an inner pressing ring, 9 is an external ring, 10 is a steel outer ring, and 11 is an upper die pressing head. DETAILED DESCRIPTION
[0017] The technical scheme of the utility model will be further described in detail below with reference to the drawings and embodiments.
[0018] As Figure 1 ,Figure 2 The utility model provides a large -scale tapered roller bearing cage shrinkage mould, including upper compression mould 2 and lower shrinkage mould 1, the contraction cavity of lower shrinkage mould 1 is the taper platform cavity of big down small, upper compression mould 2 includes nylon inner ring 6 and steel outer ring 10, and nylon inner ring 6 is made of annular flat plate 7, inner compression ring 8 and external ring 9, and annular flat plate 7 upper end surface connects upper mould pressing head 11, and inner compression ring 8 is integrally fixedly connected at the lower end hole mouth outside of annular flat plate 7 inner hole, and external ring 9 is integrally fixedly connected at the lower end surface circumference of annular flat plate 7, wherein, the inside diameter of inner compression ring 8, the outside diameter are consistent with the big end of the pressed cage 3, steel outer ring 10 is fixedly covered in the outside of external ring 9, lower shrinkage mould 1 is set in the below of upper compression mould 2, the side wall lower end of the inner hole of steel outer ring 10 has annular baffle, and the upper end surface of annular baffle covers the lower end surface of external ring 9, and is integrally connected with the lower end surface of external ring 9.
[0019] In the above structure, the inner compression ring 8 is the working part of the upper compression mould 2, which is made of nylon material to avoid indentation during the pressing of the cage. However, the ring body made of nylon material is prone to deformation and size change over time. Therefore, the upper compression mould 2 is designed as a whole with a nylon inner ring 6 and a steel outer ring 10. The nylon inner ring 6 is designed in three parts. The double-ring structure of the external ring 9 and the inner compression ring 8 ensures the overall structural strength. The steel outer ring 10 is fixedly covered outside and at the lower end of the external ring 9. The annular flat plate 7 is connected to the upper mould pressing head, which can be used with a press machine or directly by hand. When used by hand, the pressure should be directly applied to the steel outer ring 10 to avoid damaging the nylon inner ring 6.
[0020] Specifically, when assembling the tapered roller bearing inner assembly, the cage 3 filled with tapered rollers 4 is placed into the upper part of the contraction cavity of the lower shrinkage mould 4, and then the bearing inner ring 5 is placed downward. The lower end of the bearing inner ring 5 passes over the lower end of the tapered roller 4, and the tapered roller 4 enters the raceway. The inner compression ring 8 of the upper compression mould 2 is aligned with the large end surface of the cage 3. Under the external force of the press machine, the inner compression ring 8 forces the cage 3 to move downward along the contraction cavity of the lower shrinkage mould 4, and the force is evenly distributed. Due to the effect of the contraction cavity, the cage 3 produces plastic deformation, and the divided window beams uniformly shrink inward, making the cage 3, the bearing inner ring 5, and the tapered roller 4 become an inseparable inner assembly.
[0021] The upper end surface of the steel outer ring 10 is flush with the upper end surface of the annular flat plate 7.
[0022] The height of the inner compression ring 8 is greater than the height of the external ring 9.
[0023] The lower end surface of the inner compression ring 8 has rounded corners on both sides, and the radius R of the rounded corners is greater than or equal to 5mm.
[0024] The parts not detailed in the utility model are prior art.
Claims
1. A large size tapered roller bearing cage collapsing die comprising an upper pressing die (2) and a lower collapsing die (1), characterized in that: The upper pressing die (2) comprises a nylon inner ring (6) and a steel outer ring (10), the nylon inner ring (6) is composed of a ring-shaped flat plate (7), an inner pressing ring (8) and an outer connecting ring (9), the upper end surface of the ring-shaped flat plate (7) is connected with an upper die pressing head (11), the inner pressing ring (8) is integrally and fixedly connected outside the lower end hole of the inner hole of the ring-shaped flat plate (7), and the outer connecting ring (9) is integrally and fixedly connected at the lower end surface periphery of the ring-shaped flat plate (7), wherein the inner diameter and the outer diameter of the inner pressing ring (8) are consistent with the large end of the pressed retainer (3); the steel outer ring (10) is fixedly sleeved outside the outer connecting ring (9); and the lower shrinkage die (1) is arranged below the upper pressing die (2).
2. A large conical roller bearing cage collapsing die according to claim 1, characterized in that: The shrinkage cavity of the lower shrinkage die (1) is a tapered cavity with the upper end being larger and the lower end being smaller.
3. A large conical roller bearing cage collapsing die according to claim 1, characterized in that: The lower end of the side wall of the inner hole of the steel outer ring (10) is provided with an annular stopper, the upper end surface of the annular stopper covers the lower end surface of the outer connecting ring (9), and is fixedly connected with the lower end surface of the outer connecting ring (9).
4. A large conical roller bearing cage collapsing die according to claim 1 characterized by: The upper end surface of the steel outer ring (10) is flush with the upper end surface of the ring-shaped flat plate (7).
5. A large conical roller bearing cage collapsing die according to claim 1 characterized by: The height of the inner pressing ring (8) is greater than the height of the outer connecting ring (9).
6. A large conical roller bearing cage shrink mold as set forth in claim 1, characterized by: The lower end surface of the inner pressing ring (8) is provided with rounded corners on both sides, and the radius R of the rounded corners is greater than or equal to 5mm.