A special sealing cover press-fitting die for railway bearing

Abstract

This utility model belongs to the field of bearing processing and manufacturing technology, and in particular to a special sealing cover press-fit mold for railway bearings, including a shell. The shell is generally a bowl-shaped shell with an open structure at the top diameter end face. The interior of the shell is stepped, with a first-stage stepped inner hole, a first-stage inner diameter step bottom surface, a second-stage stepped inner hole, and a second-stage inner diameter step bottom surface respectively provided from top to bottom. The first-stage and second-stage stepped inner holes are respectively clearance-fitted with the first and second outer diameters of the bearing sealing cover pressed within them. A weight-reducing groove is provided at the bottom end of the shell. A through hole is provided at the center of the inner bottom surface of the shell. This utility model has a reasonable structure and can solve the problems of sealing cover structural deformation, excessive or insufficient interference fit during the press-fitting process, effectively improving the uniformity of bearing sealing cover press-fitting, enhancing the accuracy of bearing sealing cover press-fitting, and improving the bearing sealing quality.

Description

Technical Field

[0001] This utility model belongs to the field of bearing processing and manufacturing technology, specifically relating to a special sealing cover press mold for railway bearings. Background Technology

[0002] The railway bearing sealing cover has the following functions: First, it effectively prevents external impurities from entering the bearing, protecting it from damage caused by the external environment; second, it ensures the bearing's sealing performance, preventing grease leakage and ensuring normal bearing operation. The bearing sealing cover is installed between the outer diameter of the bearing's outer ring and the outer diameter of its inner ring, with an interference fit to the outer diameter step. The quality of its press-fit directly affects the sealing effect of the sealing cover, thus affecting the bearing's operational quality. If the sealing cover is pressed unevenly, or if the bearing assembly is substandard, causing the sealing cover to loosen or fall off, it will not only deform the sealing cover structure but also result in excessive or insufficient interference fit in certain areas during press-fitting. This leads to a decrease in the fit between the sealing cover and the bearing's outer ring step, resulting in sealing failure. The bearing front cover will often experience accelerated wear and deformation, causing the oil seal to loosen or even fall off, leading to significant grease leakage, serious hot shaft failure, reduced transportation efficiency, and a significantly shortened bearing life. To ensure the press-fit quality of the sealing cover, a new type of railway bearing-specific sealing cover press-fitting mold is needed to solve the existing bearing sealing cover press-fitting problems. Utility Model Content

[0003] This utility model proposes a special sealing cover press-fit mold for railway bearings, which is used to solve the problems of sealing cover structure deformation, excessive or insufficient interference fit in some areas during the pressing process of bearing sealing cover.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a special sealing cover press-fit mold for railway bearings, comprising a shell; the shell is generally a bowl-shaped shell, with an open structure at the top diameter end face of the shell, and the interior of the shell is stepped, with a first-stage stepped inner hole, a first-stage inner diameter step bottom surface, a second-stage stepped inner hole, and a second-stage inner diameter step bottom surface respectively provided from top to bottom; the first-stage stepped inner hole and the second-stage stepped inner hole respectively have clearance fit with the first outer diameter and the second outer diameter of the bearing sealing cover pressed therein; a weight-reducing groove is provided at the bottom end of the shell; and a through hole is provided at the center of the inner bottom surface of the shell.

[0005] The transition points between the first-stage stepped inner hole and the second-stage stepped inner hole and the first and second outer diameters of the bearing sealing cover are all provided with rounded chamfers.

[0006] The bottom surfaces of the first-level inner diameter step and the second-level inner diameter step are provided with a face-to-face parallelism error relative to the bottom surface of the bearing seal cover.

[0007] The housing and the bearing seal cover are concentrically arranged.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] By setting two-stage stepped inner holes inside the press-fit mold, which respectively have clearance fits with the first and second outer diameters of the bearing seal cover, the bearing seal cover is guided to the outer diameter step of the bearing, facilitating press-fitting and solving the problem of excessive or insufficient interference fit of the bearing seal cover in some areas during press-fitting. At the same time, by setting the technical requirement that the bottom surface of the two-stage inner diameter step is parallel to the bottom surface of the bearing seal cover, the uniformity of the press-fitting of the bearing seal cover is effectively improved, the risk of deformation of the bearing seal cover after press-fitting is greatly reduced, the press-fitting accuracy of the bearing seal cover is improved, and the bearing sealing quality is improved. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure 2 This is a schematic diagram illustrating an embodiment of the present utility model.

[0012] In the diagram: 1. Housing, 2. First-stage stepped inner hole, 3. Bottom surface of the first-stage inner diameter step, 4. Second-stage stepped inner hole, 5. Bottom surface of the second-stage inner diameter step, 6. Bearing seal cover, 7. Bearing outer ring, 8. Weight reduction groove, 9. Through hole, 10. Rounded chamfer, 11. Bearing inner ring, 12. Cage, 13. Roller. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: as shown in the attached drawings Figure 1 , Figure 2 The diagram shows a special press-fit mold for a railway bearing sealing cover, comprising a housing 1. The housing 1 is generally a bowl-shaped shell, with an open structure at the top diameter end face. The interior of the housing 1 is stepped, with a first-stage stepped inner hole 2, a first-stage inner diameter step bottom surface 3, a second-stage stepped inner hole 4, and a second-stage inner diameter step bottom surface 5 respectively arranged from top to bottom. The first-stage stepped inner hole 2 and the second-stage stepped inner hole 4 are respectively clearance-fitted with the first and second outer diameters of the bearing sealing cover 6 pressed therein. The housing 1 and the bearing sealing cover 6 are concentrically arranged. This is designed to guide the bearing sealing cover 6 to the outer diameter step of the bearing outer ring 7 before press-fitting, facilitating press-fitting and avoiding the problem of excessive or insufficient interference fit of the bearing sealing cover 6 in some areas, thus ensuring the quality of press-fitting.

[0014] A weight-reducing groove 8 is provided at the bottom end of the housing 1; the weight-reducing groove 8 is provided here to reduce the weight of the housing 1 to facilitate installation and reduce the labor intensity of the operator; a through hole 9 is provided at the center of the inner bottom surface of the housing 1; the through hole 9 is provided here to facilitate handling during use and reduce the overall weight of the mold, making it convenient to use; the transition between the first-stage stepped inner hole 2 and the second-stage stepped inner hole 4 and the first and second outer diameters of the bearing seal cover is provided with a rounded chamfer 10; the rounded chamfer 10 is provided here to avoid interference with the dimensions of the bearing seal cover 6 during the pressing process, which would affect the pressing depth; the bottom surface 3 of the first-stage inner diameter step and the bottom surface 5 of the second-stage inner diameter step are provided with a face-to-face parallelism error relative to the bottom surface of the bearing seal cover 6.

[0015] In use, this invention first places the bearing seal cover 6 vertically on the outer diameter of the bearing outer ring 7 to be press-fitted, ensuring that the bearing seal cover 6 and the bearing outer ring 7 are concentric. Then, the housing 1 of the pressing mold is placed vertically on the first step of the outer diameter of the bearing seal cover 6, ensuring that the housing 1 of the pressing mold and the bearing seal cover 6 are concentric. At this time, the press head of the press machine is activated to apply a certain pressure to the housing 1 of the pressing mold, ensuring that the mold presses onto the step of the outer diameter of the bearing outer ring 7, so that the bearing seal cover 6 achieves the required size and accuracy after pressing, thus completing the pressing process of the bearing seal cover 6. This invention can solve the problems of seal cover structure deformation, excessive or insufficient interference fit in some areas during the pressing process of bearing seal cover pressing.

[0016] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A special sealing cover press-fit mold for railway bearings, comprising a housing (1); characterized in that: The shell (1) is a bowl-shaped shell with an open structure on the top diameter end face. The interior of the shell (1) is stepped, and from top to bottom, there are a first-stage stepped inner hole (2), a first-stage inner diameter step bottom surface (3), a second-stage stepped inner hole (4), and a second-stage inner diameter step bottom surface (5). The first-stage stepped inner hole (2) and the second-stage stepped inner hole (4) are respectively clearance-fitted with the first outer diameter and the second outer diameter of the bearing seal cover (6) pressed therein. The bottom end of the shell (1) is provided with a weight-reducing groove (8). The center of the inner bottom surface of the shell (1) is provided with a through hole (9).

2. The railway bearing special sealing cover press-fit mold according to claim 1, characterized in that: The first-stage stepped inner hole (2) and the second-stage stepped inner hole (4) are provided with rounded chamfers (10) at the transition points with the first outer diameter and the second outer diameter of the bearing seal cover (6).

3. The railway bearing special sealing cover press-fit mold according to claim 1, characterized in that: The bottom surfaces of the first-level inner diameter step (3) and the second-level inner diameter step (5) are provided with a face-to-face parallelism error relative to the bottom surface of the bearing seal cover (6).

4. The railway bearing special sealing cover press-fit mold according to claim 1, characterized in that: The housing (1) and the bearing seal cover (6) are arranged concentrically.

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