A hub inner ring and a manufacturing method thereof

Abstract

The present invention relates to an inner hub ring and a manufacturing method thereof, which belong to the technical field of transportation vehicle parts. The inner hub ring includes an inner ring body fixed inside a rim. One end of the inner ring body is bent outward to form a connecting edge, and a reinforcing ring is formed by bending at the edge of the connecting edge. A receiving groove is formed among the inner ring body, the connecting edge and the reinforcing ring. At least eight folding connectors are provided on the reinforcing ring. The folding connectors are located in the receiving groove and are in contact with the bottom of the receiving groove. A threaded hole penetrates through the folding connector. The folding connector is formed by bending a connecting bar and has a U-shaped structure after bending. The purpose of the present invention is to provide an inner hub ring and a manufacturing method thereof that have a simple and reasonable structure, do not require welding, liberate labor, and can reduce production costs and production difficulties.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle parts, and relates to a wheel hub, in particular to an inner ring of a wheel hub and a manufacturing method thereof. Background Art

[0002] An electric wheel hub structure is usually used on existing electric vehicles. The electric wheel hub structure combines a drive motor, a tire, etc. into an integral whole to realize the drive of the electric vehicle, and has the advantages of safety, stability, compact structure, etc. At present, all the electric wheel hub structures on the market are split type, which includes a rim, an inner ring, and aluminum alloy covers fixed on both sides by screws and used for sealing. In order to increase the connection stability between the inner ring and the aluminum alloy cover, most manufacturers will weld lugs on the inner ring, and set internal threads on the lugs. After the aluminum alloy cover is connected to the internal threads by screws, it is connected to the inner ring. The inner ring and the lugs are welded together by manual welding. The manual welding method is time-consuming and laborious, and it will also cause the situation of false welding, reducing the product qualification rate. Summary of the Invention

[0003] The purpose of the invention is to provide an inner ring of a wheel hub and a manufacturing method thereof, which have a simple and reasonable structure, do not need welding, liberate manpower, and can reduce production costs and production difficulties.

[0004] The purpose of the invention is realized as follows:

[0005] An inner ring of a wheel hub includes an inner ring body fixed in a rim. One end of the inner ring body is bent outward to form a connecting edge, and a reinforcing ring is bent and formed at the edge of the connecting edge. A receiving groove is formed between the inner ring body, the connecting edge and the reinforcing ring. At least eight folding connecting pieces are arranged on the reinforcing ring. The folding connecting pieces are located in the receiving groove and are in contact with the bottom of the receiving groove. A threaded hole penetrates through the folding connecting piece.

[0006] In the above-mentioned inner ring of the wheel hub, the folding connecting piece is formed by bending a connecting bar, and is in a U-shaped structure after being bent.

[0007] In the above-mentioned inner ring of the wheel hub, the threaded hole is located at the middle end of the folding connecting piece.

[0008] In the above-mentioned inner ring of the wheel hub, the height of the reinforcing ring is lower than the height of the inner ring body.

[0009] In the above-mentioned inner ring of the wheel hub, the folding connecting pieces are evenly distributed on the reinforcing ring, and the number of the folding connecting pieces is eight or nine or ten.

[0010] A manufacturing method of an inner ring of a wheel hub, the manufacturing method includes the following steps:

[0011] S1. Stamping and blanking: Place the flat plate into a stamping die to punch it into a strip-shaped plate with several connecting strips on one side.

[0012] S2. Curling and forming: Place the stamped plate into a curling device for curling to make the two ends of the plate approach each other.

[0013] S3. Welding and forming: Weld the two ends of the plate that approach each other to form a cylinder, which includes a cylinder body, a connecting edge, a reinforcing ring, and a connecting strip.

[0014] S4. Flanging of the cylinder: Place the cylinder with a connecting strip at one end into a flanging die for flanging, and the flanged end of the cylinder is the end with the connecting strip. When flanging, the connecting edge, the reinforcing ring, and the connecting strip are folded simultaneously.

[0015] S5. Flattening the flanged part: Place the flanged cylinder into a flattening die for flattening. When flattening, the connecting edge, the reinforcing ring, and the connecting strip are flattened simultaneously, and the connecting edge, the reinforcing ring, and the connecting strip are perpendicular to the cylinder body.

[0016] S6. Vertical folding of the flanged part: Place the flattened cylinder into a vertical edge die for vertical edging. When vertical edging, the reinforcing ring and the connecting strip are folded simultaneously and are perpendicular to the connecting edge. After folding, a receiving groove is formed between the connecting edge, the reinforcing ring, and the connecting strip.

[0017] S7. Rolling the vertical edge into a circle: Place the cylinder with a vertical edge into a rolling die for rolling the edge into a circle. When rolling the edge into a circle, the connecting strip is rolled into a circle, and its end is bent towards the space between the connecting edge and the reinforcing ring.

[0018] S8. Flattening the rolled circle: Turn the cylinder with a rolled circle into a flattening die for flattening. When flattening, the flattening die flattens the curled connecting strip between the connecting edge and the reinforcing ring, and finally form a threaded hole on the folded connecting strip, and the threaded hole penetrates the connecting edge.

[0019] In the above manufacturing method of the inner ring of the wheel hub, the stamping die includes a matching stamping punch and a stamping die block. The stamping die block is provided with a first strip-shaped groove, and one side of the first strip-shaped groove communicates with several second strip-shaped grooves, and the second strip-shaped grooves are perpendicular to the first strip-shaped groove.

[0020] In the above manufacturing method of the inner ring of the wheel hub, the flanging die includes a flanging pressing seat and a flanging placing seat. The flanging pressing seat is located above the flanging placing seat, and the upper end of the flanging placing seat is provided with a cylinder placing table. There is a flanging arc surface between the cylinder placing table and the flanging placing seat. The flattening die includes a flattening pressing seat and a flattening placing seat. The flattening placing seat is provided with a flattening placing table, and the flattening pressing seat is provided with a flattening receiving groove adapted to the flattening placing table, and there is a gap between the flattening receiving groove and the flattening placing table.

[0021] In the manufacturing method of the inner ring of the hub described above, the vertical side die includes a vertical side pressing seat and a vertical side placing seat that cooperate with each other. A vertical side placing table is provided on the vertical side placing seat, and a vertical side groove surrounding the vertical side placing table is provided on the vertical side placing seat. A vertical side pressing ring for inserting into the vertical side groove is provided on the vertical side pressing seat. The curling die includes a curling pressing seat and a curling placing seat that cooperate with each other. A curling placing table is provided on the curling placing seat, and a limiting step is provided on the periphery of the curling placing table. A curling receiving groove and a curling groove are provided on the curling pressing seat. The curling groove is provided around the periphery of the curling receiving groove, and the bottom of the curling groove is an arc structure. The lower end surface of the curling pressing seat contacts the upper end surface of the limiting step.

[0022] In the manufacturing method of the inner ring of the hub described above, the flattening die includes a flattening seat and a flattening placing seat. The flattening seat is located above the flattening placing seat, and a flattening placing table is provided above the flattening placing seat. A guiding bevel is provided on the flattening placing table. A flattening receiving groove for accommodating the cylinder body is provided on the flattening placing seat. The flattening receiving groove is provided around the flattening placing table, and a pressing ring for extending into the receiving groove to flatten the connecting strip is formed at the lower end of the flattening seat.

[0023] The prominent and beneficial technical effects of the present invention compared with the prior art are:

[0024] In the present invention, a connecting edge and a reinforcing ring are bent and formed on the inner ring body, and a folding connecting piece is bent and formed on the reinforcing ring towards the receiving groove. By using the folding connecting piece instead of the tab, the production difficulty is reduced while ensuring normal use. The present invention is formed by stamping with a stamping machine, without manual welding, and no virtual welding will occur, improving the yield rate. Brief Description of the Drawings

[0025] Figure 1 is one of the structural diagrams of the present invention.

[0026] Figure 2 is another structural diagram of the present invention.

[0027] Figure 3 is the top view of the present invention.

[0028] Figure 4 is the rotating cross-sectional view of the top view of the present invention.

[0029] Figure 5 is the structural schematic diagram of a rim fixed with one inner ring.

[0030] Figure 6 is the structural schematic diagram of a rim fixed with two inner rings.

[0031] Figure 7 It is one of the structural schematic diagrams of the stamping die of the present invention.

[0032] Figure 8 It is the second of the structural schematic diagrams of the stamping die of the present invention.

[0033] Figure 9 It is the structural schematic diagram of the sheet material cut by the present invention.

[0034] Figure 10 It is the schematic diagram of the winding shaft of the curling device of the present invention.

[0035] Figure 11 It is the cross-sectional view of the flanging die of the present invention.

[0036] Figure 12 It is the cross-sectional view of the flattening die of the present invention.

[0037] Figure 13 It is the cross-sectional view of the vertical edge die of the present invention.

[0038] Figure 14 It is the cross-sectional view of the curling die of the present invention.

[0039] Figure 15 It is the cross-sectional view of the flattening die of the present invention.

[0040] 1 - inner ring body; 2 - connecting edge; 3 - reinforcing ring; 4 - receiving groove; 10 - stamping punch;

[0041] 20 - stamping die; 30 - flanging pressure seat; 31 - folding connecting piece; 32 - threaded hole; 40 - flattening pressure seat; 50 - vertical edge pressure seat; 60 - curling pressure seat; 70 - flattening seat; 100 - rim; 101 - strip groove one;

[0042] 102 - strip groove two; 301 - flanging placement seat; 302 - cylinder placement table; 303 - flanging arc surface;

[0043] 401 - flattening placement seat; 402 - flattening placement table; 403 - flattening receiving groove; 501 - vertical edge placement seat; 502 - vertical edge placement table; 503 - vertical edge groove; 504 - vertical edge pressure ring; 601 - curling placement seat;

[0044] 602 - curling placement table; 603 - limiting step; 604 - curling receiving groove; 605 - curling groove;

[0045] 701 - flattening placement seat; 702 - flattening placement table; 703 - guiding bevel; 704 - flattening receiving groove;

[0046] 705 - pressure ring. Specific embodiments

[0047] The present invention will be further described below with reference to the accompanying drawings in specific embodiments:

[0048] As shown in Figures 1 - 6 the figure: A hub inner ring includes an inner ring body 1 fixed inside a rim 100. One end of the inner ring body 1 is bent outward to form a connecting edge 2. A reinforcing ring 3 is formed by bending at the edge of the connecting edge 2. A receiving groove 4 is formed between the inner ring body 1, the connecting edge 2 and the reinforcing ring 3. At least eight folding connectors 31 are provided on the reinforcing ring 3. The folding connectors 31 are located in the receiving groove 4 and are in contact with the bottom of the receiving groove 4. A threaded hole 32 penetrates through the folding connector 31. Specifically, the hub inner ring of the present invention uses folding connectors instead of lugs, which reduces the production difficulty while ensuring the normal use of the inner ring. Moreover, the inner ring is formed by stamping with a stamping machine, without manual welding, and there will be no occurrence of false welding, improving the yield rate and reducing the production difficulty.

[0049] In the above-mentioned hub inner ring, the folding connector 31 is formed by bending a connecting strip and has a U-shaped structure after bending. Specifically, the folding connector is folded in the receiving groove, playing the same role as a lug. Compared with welding, the folding method is simpler and can be completed only by the cooperation of a stamping die and a stamping machine, which can liberate manpower, reduce production costs and production difficulty.

[0050] In the above-mentioned hub inner ring, the threaded hole 32 is located at the middle end of the folding connector 31, which can ensure the stable connection between the cover plate and the inner ring.

[0051] In the above-mentioned hub inner ring, the height of the reinforcing ring 3 is lower than that of the inner ring body 1, which is to facilitate the connection between the inner ring body and the hub and the cover plate.

[0052] In the above-mentioned hub inner ring, the folding connectors 31 are evenly distributed on the reinforcing ring 3, and the number of the folding connectors 31 is eight or nine or ten, which can meet different types of cover plates.

[0053] A manufacturing method of a hub inner ring, as shown in Figures 7 - 15 the figure, the manufacturing method includes the following steps:

[0054] S1. Stamping and blanking: Putting a flat plate into a stamping die to punch out a strip-shaped plate with a plurality of connecting strips on one side;

[0055] S2. Curling and forming: Putting the stamped plate into a curling device for curling to make the two ends of the plate approach each other;

[0056] S3. Welding and forming: Welding the two ends of the plate that approach each other together to form a cylinder, and the cylinder includes a cylinder body, a connecting edge, a reinforcing ring and a connecting strip;

[0057] S4. Cylinder flanging: Place the cylinder with a connecting strip at one end into the flanging die for flanging. The flanging end of the cylinder is the end with the connecting strip. During flanging, the connecting edge, the reinforcing ring, and the connecting strip are folded simultaneously.

[0058] S5. Flanging flattening: Place the flanged cylinder into the flattening die for flattening. During flattening, the connecting edge, the reinforcing ring, and the connecting strip are flattened simultaneously, and the connecting edge, the reinforcing ring, and the connecting strip are perpendicular to the cylinder body.

[0059] S6. Flanging vertical folding: Place the flattened cylinder into the vertical edge die for vertical edging. During vertical edging, the reinforcing ring and the connecting strip are folded simultaneously and are perpendicular to the connecting edge. After folding, a receiving groove is formed between the connecting edge, the reinforcing ring, and the connecting strip.

[0060] S7. Vertical edging curling: Place the vertically edged cylinder into the curling die for curling. During curling, the connecting strip is curled, and its end is bent towards the space between the connecting edge and the reinforcing ring.

[0061] S8. Curling flattening: Turn the curled cylinder into the flattening die for flattening. During flattening, the flattening die flattens the curled connecting strip between the connecting edge and the reinforcing ring. Finally, a formed threaded hole is made in the folded connecting strip, and the threaded hole penetrates the connecting edge.

[0062] In the above manufacturing method of the inner ring of the wheel hub, the stamping die includes a matching stamping punch 10 and a stamping die 20. A first strip-shaped groove 101 is provided on the stamping die 20, and a plurality of second strip-shaped grooves 102 communicate with one side of the first strip-shaped groove 101. The second strip-shaped grooves 102 are perpendicular to the first strip-shaped groove 101. Specifically, the connecting strips are evenly distributed on the plate, and the connecting strips are located at both ends of the plate. After curling and forming, the connecting strips at both ends of the plate are welded together during welding, which can improve the overall strength and prepare for the next process.

[0063] In the above manufacturing method of the inner ring of the wheel hub, the flanging die includes a flanging press seat 30 and a flanging placement seat 301. The flanging press seat 30 is located above the flanging placement seat 301. An upper end portion of the flanging placement seat 301 is provided with a cylinder placement table 302. A flanging arc surface 303 is provided between the cylinder placement table 302 and the flanging placement seat 301. Specifically, during flanging, one end with a connecting strip is placed on the cylinder placement table. The cylinder is pressed by the flanging press seat, causing the cylinder to move downward. While the cylinder moves downward, it will be guided by the flanging arc surface, and the connecting strip and part of the cylinder will bend outward. The flattening die includes a flattening press seat 40 and a flattening placement seat 401. A flattening placement table 402 is provided on the flattening placement seat 401. A flattening receiving groove 403 adapted to the flattening placement table 402 is provided on the flattening press seat 40. A gap is left between the flattening receiving groove 403 and the flattening placement table 402. Specifically, the bent cylinder is placed on the flattening placement table. The bent part of the cylinder and the connecting strip are perpendicular to the cylinder through the cooperation between the flattening press seat and the flattening placement seat. This gap is used to accommodate the cylinder to ensure that it will not be deformed.

[0064] In the above manufacturing method of the inner ring of the wheel hub, the vertical edge die includes a mutually cooperating vertical edge press seat 50 and a vertical edge placement seat 501. A vertical edge placement table 502 is provided on the vertical edge placement seat 501. A vertical edge groove 503 surrounding the vertical edge placement table 502 is provided on the vertical edge placement seat 501. A vertical edge pressing ring 504 for inserting into the vertical edge groove 503 is provided on the vertical edge press seat 50. Specifically, after the connecting strip and part of the cylinder are flattened, the cylinder is placed on the vertical edge placement table for vertical edge treatment. After the cylinder is placed, the vertical edge pressing ring moves downward and cooperates with the vertical edge groove to erect the connecting strip and part of the cylinder. The width of the vertical edge pressing ring is smaller than the width of the vertical edge groove. In this way, when pressing downward, the connecting strip and part of the cylinder can be bent upward along the vertical edge placement seat. The curling die includes a mutually cooperating curling press seat 60 and a curling placement seat 601. A curling placement table 602 is provided on the curling placement seat 601. A limiting step 603 is provided on the circumferential side of the curling placement table 602. A curling receiving groove 604 and a curling groove 605 are provided on the curling press seat 60. The curling groove 605 is provided around the circumferential side of the curling receiving groove 604, and the bottom of the curling groove 605 is an arc structure. The lower end surface of the curling press seat 60 contacts the upper end surface of the limiting step 603. Specifically, after the vertical edge treatment is completed, the cylinder is sleeved on the curling placement table. The curling press seat moves downward. Since the bottom of the curling groove is an arc structure, the connecting strip is curled through the curling groove after being extruded by the curling press seat, and the curling direction is downward.

[0065] In the manufacturing method of the inner ring of the wheel hub described above, the flattening die includes a flattening seat 70 and a flattening placement seat 701. The flattening seat 70 is located above the flattening placement seat 701, and a flattening placement table 702 is provided above the flattening placement seat 701. A guiding bevel 703 is provided on the flattening placement table 702. A flattening receiving groove 704 for receiving the cylinder is provided on the flattening placement seat 701. The flattening receiving groove 704 is arranged around the flattening placement table 702, and a pressing ring 705 for extending into the receiving groove to flatten the connecting strip is formed at the lower end of the flattening seat 70. Specifically, after curling, the cylinder is sleeved on the flattening placement table, and the partially bent cylinder is located in the flattening receiving groove. When the flattening seat moves downward, the pressing ring can squeeze the curled connecting strip again, and the squeezed connecting strip is located between the connecting edge, the reinforcing ring and the inner ring body.

[0066] The above embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A manufacturing method of a hub inner ring, characterized in that, The inner ring of the wheel hub includes an inner ring body (1) fixed inside the rim. One end of the inner ring body (1) is bent outward to form a connecting edge (2). A reinforcing ring (3) is formed by bending at the edge of the connecting edge (2). A receiving groove (4) is formed between the inner ring body (1), the connecting edge (2), and the reinforcing ring (3). At least eight folding connectors (31) are provided on the reinforcing ring (3). The folding connectors (31) are located inside the receiving groove (4) and are in contact with the bottom of the receiving groove (4). A threaded hole (32) penetrates through the folding connector (31). The manufacturing method includes the following steps: S1. Stamping and blanking: Place a flat sheet into a stamping die to stamp out a strip-shaped sheet with several connecting strips on one side; S2. Curling and forming: Place the stamped sheet into a curling device for curling to make the two ends of the sheet approach each other; S3. Welding and forming: Weld the two ends of the sheet that approach each other together to form a cylinder. The cylinder includes a cylinder body, a connecting edge, a reinforcing ring, and a connecting strip; S4. Flanging of the cylinder: Place the cylinder with a connecting strip at one end into a flanging die for flanging. The flanging end of the cylinder is the end with the connecting strip. When flanging, the connecting edge, the reinforcing ring, and the connecting strip are folded simultaneously; S5. Flattening the flanged part: Place the flanged cylinder into a flattening die for flattening. When flattening, the connecting edge, the reinforcing ring, and the connecting strip are flattened simultaneously, and the connecting edge, the reinforcing ring, and the connecting strip are perpendicular to the cylinder body; S6. Vertical folding of the flanged part: Place the flattened cylinder into a vertical edge die for vertical edging. When vertical edging, the reinforcing ring and the connecting strip are folded simultaneously and are perpendicular to the connecting edge. After folding, a receiving groove is formed between the connecting edge, the reinforcing ring, and the connecting strip; S7. Rolling the vertical edge into a circle: Place the cylinder with a vertical edge into a circular rolling die for circular rolling. When circular rolling, the connecting strip is rolled into a circle, and its end is bent towards the space between the connecting edge and the reinforcing ring; S8. Flattening the rolled circle: Turn the cylinder with a rolled circle into a flattening die for flattening. When flattening, the flattening die flattens the curled connecting strip between the connecting edge and the reinforcing ring. Finally, a threaded hole is formed on the folded connecting strip, and the threaded hole penetrates through the connecting edge.

2. The manufacturing method of the inner hub as claimed in claim 1, wherein: The stamping die includes a matching stamping punch (10) and a stamping die block (20). A first strip-shaped groove (101) is provided on the stamping die block (20), and several second strip-shaped grooves (102) communicate with one side of the first strip-shaped groove (101). The second strip-shaped grooves (102) are perpendicular to the first strip-shaped groove (101).

3. The manufacturing method of the inner ring of the wheel hub according to claim 1, characterized in that: The flanging die includes a flanging pressure seat (30) and a flanging placement seat (301). The flanging pressure seat (30) is located above the flanging placement seat (301). The upper end of the flanging placement seat (301) is provided with a cylinder placement table (302). A flanging arc surface (303) is provided between the cylinder placement table (302) and the flanging placement seat (301). The flattening die includes a flattening pressure seat (40) and a flattening placement seat (401). A flattening placement table (402) is provided on the flattening placement seat (401). A flattening receiving groove (403) adapted to the flattening placement table (402) is provided on the flattening pressure seat (40). A gap is left between the flattening receiving groove (403) and the flattening placement table (402).

4. The manufacturing method of the inner ring of the wheel hub according to claim 1, characterized in that: The vertical edge die includes a mutually cooperating vertical edge pressure seat (50) and a vertical edge placement seat (501). A vertical edge placement table (502) is provided on the vertical edge placement seat (501). A vertical edge groove (503) surrounding the vertical edge placement table (502) is provided on the vertical edge placement seat (501). A vertical edge pressing ring (504) for inserting into the vertical edge groove (503) is provided on the vertical edge pressure seat (50). The curling die includes a mutually cooperating curling pressure seat (60) and a curling placement seat (601). A curling placement table (602) is provided on the curling placement seat (601). A limiting step (603) is provided on the circumferential side of the curling placement table (602). A curling receiving groove (604) and a curling groove (605) are provided on the curling pressure seat (60). The curling groove (605) is provided around the circumferential side of the curling receiving groove (604), and the bottom of the curling groove (605) is an arc structure. The lower end surface of the curling pressure seat (60) contacts the upper end surface of the limiting step (603).

5. The manufacturing method of the inner ring of the wheel hub according to claim 1, characterized in that: The flattening die includes a flattening seat (70) and a flattening placement seat (701). The flattening seat (70) is located above the flattening placement seat (701). A flattening placement table (702) is provided above the flattening placement seat (701). A guiding bevel (703) is provided on the flattening placement table (702). A flattening receiving groove (704) for accommodating the cylinder is provided on the flattening placement seat (701). The flattening receiving groove (704) is provided around the flattening placement table (702). A pressing ring (705) for extending into the receiving groove to flatten the connecting strip is formed at the lower end of the flattening seat (70).

6. The manufacturing method of the inner ring of the wheel hub according to claim 1, characterized in that: The folding connecting piece (31) is formed by bending a connecting strip and is in a U-shaped structure after bending.

7. The manufacturing method of the inner ring of the wheel hub according to claim 1, characterized in that: The threaded hole (32) is located at the middle end of the folding connecting piece (31).

8. The manufacturing method of the inner ring of the wheel hub according to claim 1, characterized in that: The height of the reinforcing ring (3) is lower than the height of the inner ring body (1).

9. The manufacturing method of the inner ring of the wheel hub according to claim 1 or 6 or 7 or 8, characterized in that: The folding connecting pieces (31) are evenly distributed on the reinforcing ring (3), and the number of the folding connecting pieces (31) is eight or nine or ten.

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