Cold rolling middleware of conical bearing ring

Abstract

The utility model relates to a cold rolling middleware of a conical bearing ring, which comprises a circular ring-shaped ring, a cylindrical lower flow guide surface is formed at the lower part of the inner side of the ring, a conical upper flow guide surface is formed at the upper part of the inner side of the ring, and the diameter of the inner wall of the top end of the upper flow guide surface is larger than that of the inner wall of the bottom end of the lower flow guide surface; and the upper flow guide surface in the ferrule is longer than the lower flow guide surface. The ferrule is rolled to obtain a conical bearing outer ring, and a conical assembly surface is formed in the conical bearing outer ring; the area of the upper end face of the conical bearing outer ring is larger than that of the upper end face of the ferrule, the area of the lower end face of the conical bearing outer ring is larger than that of the lower end face of the ferrule, and the areas of the upper end face and the lower end face of the ferrule are reduced by 5%-5.5% compared with those of the upper end face and the lower end face of the conical bearing outer ring. The inner wall of the ferrule is designed into the inner wall combining the conical surface and the cylindrical surface, so that the thickness of the middle of the ferrule is increased, materials in the middle of the ferrule can flow to the two ends of the ferrule in the ring rolling process, and concave surfaces are prevented from appearing on the end faces of the ring after ring rolling.

Description

Technical Field:

[0001] The utility model relates to the technical field of bearing ring forgings, and more specifically to an intermediate part for cold rotary expansion of a tapered bearing ring. Background Art:

[0002] Existing bearings generally include an outer ring, an inner ring, steel balls and a cage. The inner ring is inserted into the outer ring, and a cage is inserted between the outer ring and the inner ring. The cage is loaded with annularly distributed steel balls, and the cage is clamped between the outer ring and the inner ring. At present, there is a tapered bearing outer ring 2 with a structure as shown in the accompanying drawings of the specification Figure 1 shown. The inside of the tapered bearing outer ring 2 is conical. The tapered bearing outer ring 2 is generally forged into a ring 1 as shown in Figure 2 shown. A conical forging forming surface 11' is formed in the ring 1, and then the ring 1 is rotary expanded to obtain the required tapered bearing outer ring 2. However, it is found that after the rotary expansion process, concave surfaces appear on both end faces of some tapered bearing outer rings 2. The depth of some concave surfaces will affect the remaining amount for subsequent turning processing, and thus can only be scrapped. Therefore, it is necessary to improve the ring parts during the rotary expansion or forging process to eliminate the concave surfaces on the end faces of the tapered bearing outer rings. Summary of the Utility Model:

[0003] The purpose of the utility model is to aim at the deficiencies of the existing technology and provide an intermediate part for cold rotary expansion of a tapered bearing ring. The forging of the ring is improved, and the inner wall is designed as a combination of a conical surface and a cylindrical surface, increasing the thickness of the middle part of the ring. Thus, the material in the middle part can flow to both ends of the ring during the rotary expansion process, avoiding the appearance of concave surfaces on the end faces of the ring after rotary expansion.

[0004] An intermediate part for cold rotary expansion of a tapered bearing ring includes an annular ring. A cylindrical lower diversion surface is formed at the lower part inside the ring, and a conical upper diversion surface is formed at the upper part. The diameter of the inner wall at the top end of the upper diversion surface is larger than the diameter of the inner wall at the bottom end of the lower diversion surface;

[0005] The length of the upper diversion surface in the ring is greater than the length of the lower diversion surface.

[0006] Preferably, the ring is rotary expanded to obtain a tapered bearing outer ring, and a conical assembly surface is formed inside the tapered bearing outer ring;

[0007] The area of the upper end face of the tapered bearing outer ring is larger than the area of the upper end face of the ring, and the area of the lower end face is larger than the area of the lower end face of the ring. The areas of the upper and lower end faces of the ring are each reduced by 5% - 5.5% compared with the areas of the upper and lower end faces of the tapered bearing outer ring.

[0008] Preferably, the conical angle of the assembly surface inside the tapered bearing outer ring is less than half of the conical angle of the upper diversion surface at the upper part of the ring.

[0009] Preferably, the inner wall diameter at the lower end of the assembly surface on the inner side of the outer ring of the tapered bearing is larger than the inner wall diameter at the top end of the upper diversion surface.

[0010] Preferably, the length of the lower diversion surface inside the ferrule is equal to 46% - 47% of the total length of the ferrule.

[0011] The beneficial effects of the present utility model are as follows:

[0012] This intermediate piece is an improved forged ferrule. The inner wall of the ferrule is designed as an inner wall combining a conical surface and a cylindrical surface, increasing the thickness in the middle of the ferrule. Thus, during the ring rolling process, the material in the middle can flow to both ends of the ferrule, avoiding the appearance of concave surfaces on the end faces of the ferrule after ring rolling. BRIEF DESCRIPTION OF THE DRAWINGS:

[0013] Figure 1 is a schematic structural view of the ferrule after ring rolling of the present utility model;

[0014] Figure 2 is a schematic structural view of the ferrule before ring rolling during the current forging process;

[0015] Figure 3 is a schematic cross-sectional view of the present utility model.

[0016] In the figure: 1, ferrule; 11, lower diversion surface; 12, upper diversion surface; 11', forged forming conical surface; 2, outer ring of tapered bearing; 21, assembly surface. DETAILED DESCRIPTION OF THE EMBODIMENTS:

[0017] Embodiment: As shown in Figure 3 , a cold ring rolling intermediate piece for a tapered bearing ferrule includes an annular ferrule 1. A cylindrical lower diversion surface 11 is formed at the lower part inside the ferrule 1, and a conical upper diversion surface 12 is formed at the upper part. The inner wall diameter at the top end of the upper diversion surface 12 is larger than the inner wall diameter at the bottom end of the lower diversion surface 11;

[0018] The length of the upper diversion surface 12 inside the ferrule 1 is greater than the length of the lower diversion surface 11, but the difference in length is not much. The connection between the upper diversion surface 12 and the lower diversion surface 11 is generally located in the middle of the ferrule 1.

[0019] As shown in Figure 2 and 3 , the ferrule 1 is ring rolled to obtain the outer ring 2 of the tapered bearing. A conical assembly surface 21 is formed inside the outer ring 2 of the tapered bearing. The ferrule 1 of the present application mainly increases the wall thickness in the middle of the ferrule 1, but the dimensional control thereof needs to refer to the outer ring 2 of the tapered bearing after ring rolling;

[0020] The area of the upper end face of the outer ring 2 of the tapered bearing is larger than that of the upper end face of the ring 1, and the area of the lower end face is larger than that of the lower end face of the ring 1. The areas of the upper and lower end faces of the ring 1 are each reduced by 5% to 5.5% compared with the upper and lower end faces of the outer ring 2 of the tapered bearing. Its dimensional control is mainly defined based on the ratio of the two end faces of the ring 1 and the two end faces of the outer ring 2 of the tapered bearing, so that the relevant dimensions of the ring 1 can be set based on the dimensions of the outer ring 2 of the tapered bearing; the total weight of the ring 1 is the same as that of the outer ring 2 of the tapered bearing, and no material waste is caused during the ring rolling process.

[0021] The taper angle of the assembly surface 21 on the inner side of the outer ring 2 of the tapered bearing is less than half of the taper angle of the upper diversion surface 12 on the upper part of the ring 1.

[0022] The inner wall diameter at the lower end of the assembly surface 21 on the inner side of the outer ring 2 of the tapered bearing is larger than the inner wall diameter at the top of the upper diversion surface 12.

[0023] The length of the lower diversion surface 11 inside the ring 1 is equal to 46% to 47% of the total length of the ring 1.

[0024] Working principle: This solution is an intermediate part for cold ring rolling of the tapered bearing ring. The principle is to increase the wall thickness in the middle of the ring 1, and then rectify the conical forging forming cone surface 11' into a conical upper diversion surface 12 and a cylindrical lower diversion surface 11;

[0025] At the same time, based on the dimensions of the finished outer ring 2 of the tapered bearing after ring rolling, the areas of the upper and lower end faces of the ring 1 before ring rolling are each reduced by 5% to 5.5% compared with the upper and lower end faces of the outer ring 2 of the tapered bearing after ring rolling, so as to facilitate setting the dimensions of the ring 1.

[0026] During ring rolling, the excess material in the middle of the ring 1 flows to both ends of the ring 1, and the material in the middle is used to fill the original concave surfaces at both ends, thereby eliminating the concave surfaces at both ends of the outer ring 2 of the tapered bearing.

[0027] The described embodiments are used to illustrate the present invention by way of example, rather than to limit the present invention. Any person skilled in the art can modify the described embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of the rights protection of the present invention should be as listed in the claims of the present invention.

Claims

1. A cold ring rolling intermediate for a tapered bearing race, comprising an annular race (1), characterized in that: The lower part inside the ferrule (1) is formed with a cylindrical lower flow guiding surface (11), and the upper part is formed with a conical upper flow guiding surface (12). The diameter of the inner wall at the top end of the upper flow guiding surface (12) is larger than the diameter of the inner wall at the bottom end of the lower flow guiding surface (11). The length of the upper flow guiding surface (12) inside the ferrule (1) is larger than the length of the lower flow guiding surface (11).

2. The cold ring rolling intermediate part of a tapered bearing raceway according to claim 1, characterized in that: The ferrule (1) is used to obtain the outer ring (2) of a tapered bearing through ring rolling. A conical assembly surface (21) is formed inside the outer ring (2) of the tapered bearing. The area of the upper end surface of the outer ring (2) of the tapered bearing is larger than the area of the upper end surface of the ferrule (1), and the area of the lower end surface is larger than the area of the lower end surface of the ferrule (1). The areas of the upper and lower end surfaces of the ferrule (1) are each reduced by 5% - 5.5% compared with the areas of the upper and lower end surfaces of the outer ring (2) of the tapered bearing.

3. The cold-rolling intermediate part of a tapered bearing ring according to claim 2, characterized in that: The conical angle of the assembly surface (21) inside the outer ring (2) of the tapered bearing is less than half of the conical angle of the upper flow guiding surface (12) at the upper part of the ferrule (1).

4. The cold ring rolling intermediate of a tapered bearing ring according to claim 3, characterized in that: The inner wall diameter at the lower end of the assembly surface (21) inside the outer ring (2) of the tapered bearing is larger than the inner wall diameter at the top end of the upper flow guiding surface (12).

5. The cold ring rolling intermediate part of a tapered bearing raceway according to claim 1, characterized in that: The length of the lower flow guiding surface (11) inside the ferrule (1) is equal to 46% - 47% of the total length of the ferrule (1).

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