Pouring device for die casting of electric drive housing
Patent Information
- Application Number
- CN202521960197.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-12
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-09-12
AI Technical Summary
由于电驱壳体设计时，需结合具体型号优化布局，以兼顾轻量化、散热性与NVH性能，同时具备高强度、耐腐蚀性及高致密性，所以电驱壳体的结构复杂
[0006]为了解决上述问题，本实用新型提供了电驱壳体压铸用浇注装置，包括电驱壳体浇注区1、浇注装置2和排溢装置3，电驱壳体浇注区1具有对应于电驱壳体的形状，包括主腔体11、第一腔体12、第二腔体13和第三腔体14。主腔体11、第一腔体12、第二腔体13和第三腔体14均为筒形。第一腔体12、第二腔体13和第三腔体14均设置于主腔体11的顶面上，分别与主腔体11内部连通，浇注装置2包括主浇道21和多个分浇道22，分浇道22的一端与主浇道21连接，另一端与主腔体11侧壁的底部连接，内部连通。多个分浇道22与主腔体11的连接位置不同，排溢装置3分别与第一腔体12、第二腔体13和第三腔体14连接，用于排出电驱壳体浇注区1内的空气。
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Figure CN224779314U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a casting device for die casting of electric drive housings, and more particularly to the structure of the casting device for die casting of electric drive housings. Background Technology
[0002] The electric drive housing is the core packaging structure of the electric vehicle drive system. Its main function is to protect the internal key components such as motors, controllers, and reducers from external contamination and mechanical damage, while ensuring stable operation of the system under high load conditions.
[0003] As an integrated core component, the electric drive housing comprises five major functional systems: structural support, lubrication and cooling, power transmission, control mechanism, and sealing and fixing. Because the design of the electric drive housing requires optimized layout tailored to specific models to balance lightweight, heat dissipation, and NVH performance, while also possessing high strength, corrosion resistance, and high density, the structure of the electric drive housing is complex.
[0004] The electric drive housing is made of magnesium alloy by die casting. Due to the complex structure of the housing, the flow of molten metal is unstable during die casting. Impurities and cold materials tend to accumulate in the cavity, and the gas generated in the cavity cannot be effectively discharged. There are also problems such as insufficient feeding pressure during the solidification stage. These factors make the complex cavity prone to problems such as cold shut, shrinkage cavity, porosity, sintering and undercasting during the die casting process, which affect the performance of the die-cast electric drive housing, resulting in a low yield rate and increased manufacturing costs.
[0005] The purpose of this invention is to solve the problem that cold shuts, shrinkage cavities, porosity, sintering, and undercasting phenomena easily occur during the die-casting of electric drive housings, resulting in a low yield of electric drive housings. Utility Model Content
[0006] To address the aforementioned problems, this utility model provides a casting device for die-casting an electric drive housing, comprising a casting area 1, a casting device 2, and an overflow device 3. The casting area 1 has a shape corresponding to the electric drive housing and includes a main cavity 11, a first cavity 12, a second cavity 13, and a third cavity 14. The main cavity 11, the first cavity 12, the second cavity 13, and the third cavity 14 are all cylindrical. The first cavity 12, the second cavity 13, and the third cavity 14 are all located on the top surface of the main cavity 11 and communicate with the interior of the main cavity 11. The casting device 2 includes a main gating system 21 and multiple branch gating systems 22. One end of each branch gating system 22 is connected to the main gating system 21, and the other end is connected to the bottom of the side wall of the main cavity 11, communicating internally. The multiple sub-sprues 22 are connected to the main cavity 11 at different positions. The overflow device 3 is connected to the first cavity 12, the second cavity 13 and the third cavity 14 respectively, and is used to discharge the air in the electric drive housing casting area 1.
[0007] When using this device to die-cast the electric drive housing, the main gating 21 is connected to the pressure chamber, and the overflow device 3 is connected to the vacuum system. Molten metal is poured into the pressure chamber, and the molten metal is slowly pushed into the main gating 21 by the die-casting machine's injection punch, and then enters the electric drive housing's casting area 1 at high speed through each sub-gating channel 22, uniformly filling the casting area. The cooled molten metal at the front end, the impurities washed down, and the gas in the casting area enter the overflow device 3 through the overflow port, which can effectively improve defects such as cold shut and undercasting in the electric drive housing. When the molten metal fills the electric drive housing's casting area 1, it works with the vacuum system to extract the air in the pressure chamber and the electric drive housing's casting area 1 through the overflow groove, exhaust channel, exhaust plate, and exhaust hole.
[0008] This invention, by setting a main gating system 21 and multiple sub-gating systems 22, connects one end of the multiple sub-gating systems 22 to the main gating system 21 and the other end to the bottom of the side wall of the main cavity 11, thus creating internal communication. The connection positions of the multiple sub-gating systems 22 and the main cavity 11 are set according to the structural distribution of the electric drive housing casting area 1, guiding the molten metal liquid to flow smoothly and synchronously fill the electric drive housing casting area 1. This ensures smooth and synchronous filling into the electric drive housing casting area 1, thereby effectively reducing defects such as cold shuts, shrinkage cavities, porosity, sintering, and undercasting during the casting process, improving the yield of electric drive housings, and enhancing the performance of die-cast electric drive housing products.
[0009] Preferably, the overflow device 3 includes a first overflow trough 31, a second overflow trough 32, a third overflow trough 33, a first overflow pipe 34, and a second overflow pipe 35. The first overflow trough 31 is located at the top of the side wall of the first cavity 12 and communicates with the interior of the first cavity 12. Multiple first overflow troughs 31 are provided. These multiple first overflow troughs 31 are arranged along the outer periphery of the first cavity 12. The second overflow trough 32 is located at the top of the side wall of the second cavity 13 and communicates with the interior of the second cavity 13. The third overflow trough 33 is located at the top of the side wall of the third cavity 14 and communicates with the interior of the third cavity 14. One end of the first overflow pipe 34 communicates with multiple first overflow troughs 31, second overflow troughs 32, and third overflow troughs 33 on the first cavity 12 near the second cavity 13, and the other end is provided with a first overflow plate 36. One end of the second overflow pipe 35 is connected to a plurality of first overflow grooves 31 located on the other side of the first cavity 12, and the other end is provided with a second overflow plate 37.
[0010] Therefore, the overflow device 3 can collect the cold material at the front end of the molten metal and the impurities washed down from the mold when the molten metal fills the casting area 1 of the electric drive housing. The exhaust channel is connected to each overflow groove, and the gas in the casting area 1 of the electric drive housing is extracted by the vacuum system, so that the exhaust channel and the exhaust plate form an efficient exhaust path, avoid gas retention, effectively reduce porosity defects, reduce filling risk, and improve density.
[0011] Preferably, the overflow device 3 further includes a plurality of fourth overflow channels 38, a third overflow pipe 39, and a fourth overflow pipe 310. The fourth overflow channels 38 are disposed at the bottom of the side wall of the main cavity 11 and communicate with the interior of the main cavity 11. The plurality of fourth overflow channels 38 are evenly arranged along the side wall of the main cavity 11 away from the casting device 2. The first overflow pipe 34 is also connected to the plurality of fourth overflow channels 38 located on one side of the main cavity 11 near the casting device 2, and they are internally connected. The second overflow pipe 35 is also connected to the plurality of fourth overflow channels 38 located on the other side of the main cavity 11 near the casting device 2, and they are internally connected. The two ends of the third overflow pipe 39 are respectively connected to the first overflow plate 36 and the plurality of fourth overflow channels 38 near the first overflow plate 36, and they are internally connected. The two ends of the fourth overflow pipe 310 are respectively connected to the first overflow plate 36 and the plurality of fourth overflow channels 38 near the first overflow plate 36, and they are internally connected.
[0012] By setting multiple fourth overflow grooves 38 at the bottom of the side wall of the main cavity 11, the gas in the main cavity 11 can be discharged, thereby further reducing porosity defects during casting, reducing filling risk, increasing density, and improving the quality of the electric drive housing.
[0013] Preferably, both the first overflow plate 36 and the second overflow plate 37 are provided with overflow holes. The overflow holes can be connected to the vacuum system to avoid gas retention, further reduce porosity defects during the casting of the electric drive housing, reduce filling risks, and improve density.
[0014] Preferably, the casting device 2 further includes a connecting plate 23, which is disposed at the front end of the main gating system 21. The connecting plate 23 is used to connect with the pressure chamber, so that under the pushing action of the injection punch, the molten metal liquid enters the main gating system 21 and enters the electric drive housing casting area 1 through the sub-gating system 22. Attached Figure Description
[0015] Figure 1 Schematic diagram of the left front side structure of the casting device for die casting of electric drive housing; Figure 2 Schematic diagram of the right rear side structure of the casting device for die casting of electric drive housing; Figure 3 Schematic diagram of the left rear side structure of the casting device for die casting of electric drive housing; Figure 4 Schematic diagram of the front structure of the casting device for die casting of electric drive housing; Figure 5 Schematic diagram of the bottom structure of the casting device for die casting of electric drive housing.
[0016] In the figure, 1. Electric drive housing casting area, 11. Main cavity, 12. First cavity, 13. Second cavity, 14. Third cavity, 2. Casting device, 21. Main runner, 22. Sub-runner, 23. Connecting plate, 3. Overflow device, 31. First overflow trough, 32. Second overflow trough, 33. Third overflow trough, 34. First overflow pipe, 35. Second overflow pipe, 36. First overflow plate, 37. Second overflow plate, 38. Fourth overflow trough, 39. Third overflow pipe, 310. Fourth overflow pipe. Detailed Implementation
[0017] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0018] like Figure 1 and Figure 2 As shown, the casting device for die casting of electric drive housing includes an electric drive housing casting area 1, a casting device 2, and an overflow device 3.
[0019] The electric drive housing casting area 1 has a shape corresponding to the electric drive housing, including a main cavity 11, a first cavity 12, a second cavity 13 and a third cavity 14.
[0020] The main cavity 11, the first cavity 12, the second cavity 13, and the third cavity 14 are all cylindrical. The first cavity 12, the second cavity 13, and the third cavity 14 are all located on the top surface of the main cavity 11 and are connected to the interior of the main cavity 11 (see reference). Figure 5 ).
[0021] The casting device 2 is located in front of the casting area 1 of the electric drive housing, and includes a main gating 21, a connecting plate 23 and thirteen branch gating 22. One end of the branch gating 22 is connected to the main gating 21, and the other end is connected to the bottom of the side wall of the main cavity 11, and the interior is connected.
[0022] Among them, five sub-sprues 22 are respectively connected to the bottom of the front side wall of the main cavity 11, four sub-sprues 22 are respectively connected to the bottom of the left side wall near the front end, and four sub-sprues 22 are respectively connected to the bottom of the right side wall near the front end (see reference). Figure 4 ).
[0023] The connecting plate 23 is located at the front end of the main gating system 21. The connecting plate 23 is used to connect with the pressure chamber, so that under the pushing action of the injection punch, the molten metal liquid enters the main gating system 21 and enters the electric drive housing casting area 1 through the sub-gating system 22.
[0024] By setting multiple sub-sprues 22 and setting the connection positions of the multiple sub-sprues 22 and the main cavity 11 according to the structural distribution of the electric drive housing casting area 1, the molten metal liquid is guided to flow smoothly and fill the electric drive housing casting area 1 synchronously, ensuring smooth and synchronous filling into the electric drive housing casting area 1, thereby effectively reducing defects such as cold shuts, shrinkage cavities, porosity, sintering, and undercasting during the casting process.
[0025] The overflow device 3 is connected to the first cavity 12, the second cavity 13 and the third cavity 14 respectively, and is used to discharge the air in the casting area 1 of the electric drive housing.
[0026] like Figure 1 and Figure 4 As shown, the overflow device 3 includes a first overflow trough 31, a second overflow trough 32, a third overflow trough 33 and a fourth overflow trough 38, as well as a first overflow pipe 34, a second overflow pipe 35, a third overflow pipe 39 and a fourth overflow pipe 310.
[0027] The first overflow trough 31 is located at the top of the side wall of the first cavity 12 and communicates with the interior of the first cavity 12. There are eleven first overflow troughs 31, of which two first overflow troughs 31 are located at the top of the left side wall of the first cavity 12, four first overflow troughs 31 are located at the top of the front side wall of the first cavity 12, and five first overflow troughs 31 are located at the top of the right side wall of the first cavity 12.
[0028] The four first overflow channels 31 located at the top of the front side wall of the first cavity 12 are interconnected.
[0029] The second overflow groove 32 is located at the top of the side wall of the second cavity 13 and communicates with the interior of the second cavity 13.
[0030] The third overflow trough 33 is located at the top of the side wall of the third cavity 14 and communicates with the interior of the third cavity 14. There are two third overflow troughs 33.
[0031] The fourth overflow groove 38 is located at the bottom of the side wall of the main cavity 11 and communicates with the interior of the main cavity 11. There are eight fourth overflow grooves 38, of which two are located at the bottom of the left side wall of the main cavity 11 near the rear, two are located at the bottom of the right side wall of the main cavity 11 near the rear, two are located at the bottom of the rear side wall of the main cavity 11 near the left side, and two are located at the bottom of the rear side wall of the main cavity 11 near the right side.
[0032] The first overflow pipe 34 is located on the left side of the casting area 1 of the electric drive housing. One end is connected to the two first overflow grooves 31 located on the top of the left side wall of the first cavity 12, the two fourth overflow grooves 38 located at the bottom of the left side wall of the main cavity 11 near the rear, as well as the second overflow groove 32 and the two third overflow grooves 33. The other end is provided with a first overflow plate 36.
[0033] The second overflow pipe 35 is located on the right side of the electric drive housing casting area 1. One end is connected to the five first overflow grooves 31 located on the top of the right side wall of the first cavity 12 and the two fourth overflow grooves 38 located at the bottom of the right side wall of the main cavity 11 near the rear. The other end is provided with a second overflow plate 37.
[0034] One end of the third overflow pipe 39 is connected to two fourth overflow troughs 38 located at the bottom of the rear side wall of the main cavity 11 near the left side, and the other end is connected to the first overflow plate 36.
[0035] One end of the fourth overflow pipe 310 is connected to two fourth overflow grooves 38 located at the bottom of the rear side wall of the main cavity 11 near the right side, and the other end is connected to the second overflow plate 37.
[0036] Both the first overflow plate 36 and the second overflow plate 37 are provided with overflow holes. These overflow holes can be connected to a vacuum system to prevent gas retention, further reduce porosity defects during the casting of the electric drive housing, lower filling risks, and improve density.
[0037] The positions of the overflow troughs are reasonably arranged according to the end position of the flow path of the molten metal filling the electric drive housing casting area 1. Specifically, the first overflow trough 31 is set at the top of the side wall of the first cavity 12, the second overflow trough 32 is set at the top of the side wall of the second cavity 13, the third overflow trough 33 is set at the top of the side wall of the third cavity 14, and the fourth overflow trough 38 is set at the bottom of the side wall of the main cavity 11. This can discharge the cold material at the front end of the molten metal, the impurities washed down from the mold when the molten metal fills the electric drive housing casting area 1, and the gas in the electric drive housing casting area 1. This makes the exhaust channel and the exhaust plate form an efficient exhaust path, avoids gas retention, effectively reduces porosity defects, lowers filling risk, increases density, and improves the quality of the electric drive housing.
[0038] In use, the main gating 21 is connected to the pressure chamber, and the overflow device 3 is connected to the vacuum system. During casting, the molten metal is poured into the pressure chamber. The molten metal is slowly pushed into the main gating 21 by the die-casting machine's injection punch, and then enters the electric drive housing casting area 1 at high speed through each sub-gating channel 22, uniformly filling the casting area. The molten metal cooled at the front end, the impurities washed down, and the gas in the casting area are discharged through the first overflow channel 31, the second overflow channel 32, the third overflow channel 33, and the fourth overflow channel 38, and enter the overflow device 3 until the casting is completed.
[0039] This invention sets up a main gating system 21 and multiple sub-gating systems 22. One end of each sub-gating system 22 is connected to the main gating system 21, and the other end is connected to the bottom of the side wall of the main cavity 11, with internal communication. The connection positions of the multiple sub-gating systems 22 and the main cavity 11 are set according to the structural distribution of the electric drive housing casting area 1. This guides the molten metal to flow smoothly and fill the electric drive housing casting area 1 synchronously, ensuring smooth and synchronous filling into the electric drive housing casting area 1. This effectively reduces defects such as cold shuts, shrinkage cavities, porosity, sintering, and undercasting during the casting process, and improves the yield and performance of the electric drive housing.
[0040] The overflow troughs are strategically positioned according to the end of the flow path of the molten metal filling the casting zone 1 of the electric drive housing. These troughs collect cold material and impurities from the front of the molten metal. The overflow troughs are interconnected and then connected to an exhaust channel. A vacuum system is used to extract air from the cavity, effectively reducing porosity defects. During the pressurization and compaction stage, the molten metal solidifies under high pressure, improving product density and reducing defects such as shrinkage cavities and porosity. This effectively ensures the quality of the electric drive housing, guarantees a stable and efficient production process, improves production efficiency, and reduces manufacturing costs.
[0041] It should be noted that the above embodiments are illustrative of the present invention and not intended to limit the present invention.
Claims
1. A casting apparatus for die-casting an electric drive housing, characterized in that, It includes the electric drive housing casting area (1), the casting device (2) and the overflow device (3). The electric drive housing casting area (1) has a shape corresponding to the electric drive housing, including a main cavity (11), a first cavity (12), a second cavity (13) and a third cavity (14). The main cavity (11), the first cavity (12), the second cavity (13) and the third cavity (14) are all cylindrical; The first cavity (12), the second cavity (13) and the third cavity (14) are all located on the top surface of the main cavity (11) and are connected to the interior of the main cavity (11); The casting device (2) includes a main gating system (21) and multiple sub-gating systems (22). One end of the sub-sprue (22) is connected to the main sprue (21), and the other end is connected to the bottom of the side wall of the main cavity (11), and the interior is connected; The connection positions of the multiple sub-sprues (22) to the main cavity (11) are different; The overflow device (3) is connected to the first cavity (12), the second cavity (13) and the third cavity (14) respectively, and is used to discharge the air in the casting area (1) of the electric drive housing.
2. The casting apparatus for die casting an electric drive housing according to claim 1, characterized in that, The overflow device (3) includes a first overflow trough (31), a second overflow trough (32), a third overflow trough (33), a first overflow pipe (34), and a second overflow pipe (35). The first overflow trough (31) is located at the top of the side wall of the first cavity (12) and communicates with the interior of the first cavity (12). Multiple first overflow troughs (31) are provided. Multiple first overflow channels (31) are arranged along the outer periphery of the first cavity (12); The second overflow trough (32) is located at the top of the side wall of the second cavity (13) and communicates with the interior of the second cavity (13); The third overflow trough (33) is located on the top of the side wall of the third cavity (14) and communicates with the interior of the third cavity (14); One end of the first overflow pipe (34) is connected to a plurality of first overflow grooves (31), second overflow grooves (32), and third overflow grooves (33) on the first cavity (12) near the second cavity (13), and the other end is provided with a first overflow plate (36). One end of the second overflow pipe (35) is connected to a plurality of first overflow grooves (31) located on the other side of the first cavity (12), and the other end is provided with a second overflow plate (37).
3. The casting apparatus for die casting an electric drive housing according to claim 2, characterized in that, The overflow device (3) also includes multiple fourth overflow channels (38), third overflow pipes (39) and fourth overflow pipes (310). The fourth overflow trough (38) is located at the bottom of the side wall of the main cavity (11) and communicates with the interior of the main cavity (11); Multiple fourth overflow grooves (38) are evenly arranged along the side of the main cavity (11) away from the pouring device (2); The first overflow pipe (34) is also connected to a plurality of fourth overflow channels (38) located on one side of the main cavity (11) near the casting device (2), and the internal communication is maintained. The second overflow pipe (35) is also connected to a plurality of fourth overflow channels (38) located on the other side of the main cavity (11) near the casting device (2), and the interior is connected; The third overflow pipe (39) is connected at both ends to the first overflow plate (36) and a plurality of fourth overflow grooves (38) near the first overflow plate (36), and is internally connected; The fourth overflow pipe (310) is connected at both ends to the first overflow plate (36) and a plurality of fourth overflow grooves (38) near the first overflow plate (36), and is internally connected.
4. The casting apparatus for die casting an electric drive housing according to claim 3, characterized in that, Both the first overflow plate (36) and the second overflow plate (37) are provided with overflow holes.
5. The casting apparatus for die casting an electric drive housing according to claim 4, characterized in that, The casting device (2) also includes a connecting plate (23). The connecting plate (23) is located at the front end of the main gating system (21).