Electric drive and housing for electric drive
By designing a notch structure in the housing of the electric drive device to be integrally formed with the oil hole, the problems of high difficulty in oil hole processing and burrs are solved, achieving efficient and low-cost oil hole processing and improving oil flow efficiency.
Patent Information
- Application Number
- CN202520265654.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-02-19
AI Technical Summary
The oil holes in the housing of existing electric drive devices are difficult to machine, especially when the hole diameter is large, burrs are easily formed and difficult to remove, which affects the processing efficiency and cost.
The notch structure is designed in the housing and the oil hole is integrally formed. The oil hole connecting the motor chamber and the reducer chamber is directly formed by casting process, avoiding subsequent machining. The notch structure is sealed with a cover plate and a magnet is used to attract metal impurities.
It improves processing efficiency, reduces manufacturing costs, avoids burr formation, simplifies processing technology, enhances oil flow efficiency, and reduces drag torque.
Smart Images
Figure CN223639068U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electric drive device technical field especially, relates to a kind of electric drive device and the shell for electric drive device. BACKGROUND
[0002] Electric drive device is a kind of equipment that converts electrical energy into mechanical energy, for driving various mechanical components or executing specific actions. The shell of the electric drive device in the prior art usually includes a motor chamber, a reducer chamber, and a bottom oil passage (also referred to as a bottom oil cavity). The motor chamber is used to install a motor, and the reducer chamber is used to install a reducer.
[0003] In the electric drive device, a transmission system and a carrier assembly for supporting the transmission system are included. There is a small gap between the carrier assembly and the transmission system, which causes the oil to fill between the two components, resulting in drag torque, which affects the overall efficiency of the machine. For example, a carrier structure is provided in the reducer to fix and support the gear system, and there is a small gap between the carrier structure and the gear.
[0004] Therefore, in the prior art, an oil hole is usually made in the shell to communicate the motor chamber and the reducer chamber, respectively, to discharge the oil generated during the operation of the motor and the reducer to the bottom oil passage, in order to solve the problem of drag torque caused by oil.
[0005] In the prior art, the oil hole is usually processed in the shell after the shell is made, which results in a high processing difficulty of the oil hole, especially when the hole diameter is large, which is prone to edge burrs and difficult to remove.
[0006] It should be noted that the information disclosed in the above background section is only used to enhance the understanding of the background of the utility model, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY
[0007] In view of the problems in the prior art, the purpose of the utility model is to provide an electric drive device and a shell for the electric drive device, which overcomes the difficulties of the prior art and reduces the processing difficulty of the oil hole in the shell of the electric drive device.
[0008] The first aspect of the present disclosure provides a shell for an electric drive device, the shell having:
[0009] a motor chamber;
[0010] a reducer chamber;
[0011] a bottom oil passage;
[0012] The gap structure cast in the bottom of the housing and the two oil holes opposite to the gap structure and respectively leading to the motor chamber and the reducer chamber are both communicated with the bottom oil channel.
[0013] In an embodiment, the gap structure is formed at the bottom of the bottom oil channel, and the two oil holes are located at the top of the bottom oil channel.
[0014] In an embodiment, hollow first and second inner protrusions are respectively cast at the top of the bottom oil channel, the first inner protrusion extends into the motor chamber, and the second inner protrusion extends into the reducer chamber, and the two oil holes are respectively formed in the first and second inner protrusions.
[0015] In an embodiment, a cover plate is arranged at the position of the gap structure, and the cover plate is used to seal the gap structure.
[0016] In an embodiment, the cover plate is mounted to the housing by welding or bolt connection.
[0017] In an embodiment, a magnet is mounted on the inner side of the cover plate.
[0018] In an embodiment, the gap structure is formed at the bottom of the bottom oil channel, and an embedded groove is cast in the sidewall of the bottom oil channel, and the magnet is embedded in the embedded groove.
[0019] In an embodiment, the magnet is located below the second oil hole leading to the reducer chamber.
[0020] In an embodiment, the housing is formed with an annular outer protrusion protruding outward at the position of the gap structure, and the cover plate is mounted to the annular outer protrusion.
[0021] The second aspect of the present disclosure provides an electric drive device comprising the housing for an electric drive device of any of the above embodiments.
[0022] The electric drive device and the housing for an electric drive device provided by the embodiments of the present disclosure have the following beneficial effects:
[0023] In the housing, the gap structure is aligned with the first and second oil holes, so that the gap structure and the first and second oil holes can be integrally formed by a casting process, without the need for secondary processing of the oil holes after casting, directly meeting the assembly requirements, and avoiding subsequent machining processes. Compared with the traditional drilling processing method, the present embodiment significantly improves the processing efficiency, reduces the manufacturing cost, and does not form burr structures, solving the problem of difficult removal of machining burrs.
[0024] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF DRAWINGS
[0025] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof as read with the accompanying drawings.
[0026] Figure 1 is a cross-sectional view of an electric drive device of the prior art.
[0027] Figure 2 is Figure 1 is a perspective view of the housing of the electric drive device shown in
[0028] Figure 3 is Figure 1 is a perspective view of the housing of the electric drive device shown in Figure 3 and Figure 2 are perspective views of the housing from different viewing angles.
[0029] Figure 4 is a cross-sectional view of an electric drive device according to an embodiment of the present disclosure.
[0030] Figure 5 is Figure 4 is a bottom view of the electric drive device shown in
[0031] Figure 6 is Figure 4 is a perspective view of the housing of the electric drive device shown in
[0032] Figure 7 is Figure 4 is a perspective view of the housing of the electric drive device shown in Figure 7 and Figure 6 are perspective views of the housing from different viewing angles.
[0033] Figure 8 is Figure 4 is an enlarged view of the notch structure position at the bottom of the housing in the electric drive device shown in
[0034] REFERENCE NUMERALS:
[0035] 1, 4, housing; 1a, 4a, motor chamber; 1b, 4b, reducer chamber; 1c, 40a, first oil hole; 1d, 40b, second oil hole; 1e, 4c, bottom oil passage; 4d, embedded groove; 5, cover plate; 6, magnet; 10, burr structure; 11, isolation structure; 12, rotary position sensor; 40, notch structure; 41, first inner protrusion; 42, second inner protrusion; 43, annular outer protrusion. DETAILED DESCRIPTION
[0036] Example implementations are now described with reference to the drawings. Example implementations can, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these example implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example implementations to those skilled in the art. The described features, structures, or characteristics can be combined in one or more implementations.
[0037] Furthermore, the accompanying drawings are only intended to show schematic illustrations of the present disclosure and are not necessarily drawn to scale. Like reference numerals in the drawings denote like or similar parts, and thus repeated description thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities, which do not necessarily have to correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.
[0038] In the housing of the prior art electric drive device, as shown in Figure 1 A first oil hole 1c and a second oil hole 1d are formed in the housing 1, respectively, to communicate with a motor chamber 1a and a reducer chamber 1b, and both the first oil hole 1c and the second oil hole 1d lead to a bottom oil passage 1e.
[0039] As shown in Figure 1 The motor chamber 1a and the reducer chamber 1b are separated by a partition structure 11. A rotational position sensor (RPS) 12 is provided in the electric drive device, which is arranged on one side of the reducer chamber 1b to monitor the position or angle of the motor or other mechanical components. In order to prevent the induced current generated during the operation of the motor from affecting the RPS, a window cannot be opened in the partition structure 11. This results in two drilling processes for the housing 1 to process the first oil hole 1c and the second oil hole 1d, which leads to low processing efficiency. In order to communicate with the bottom oil passage 1e, a side oblique drilling process is also required, for example, the second oil hole 1d is in an inclined state, which not only increases the processing difficulty, but also increases the oil passage. In addition, the first oil hole 1c is also in a substantially horizontal state, which needs to be drilled from the side, and the machining difficulty is large, and the oil passage is also long.
[0040] As shown in Figure 2 The first oil hole 1c leads to the motor chamber 1a. As shown in Figure 3 The second oil hole 1d leads to the reducer chamber 1b. Since a mechanical drilling process is used, a burr structure 10 is formed near the second oil hole 1d, and since the second oil hole 1d is in an inclined state and the burr structure is located on one side of the reducer chamber 1b, it is difficult to remove.
[0041] The embodiments of the present disclosure provide an improved housing for an electric drive device, such as Figure 4 As shown, the housing 4 is formed with:
[0042] a motor chamber 4a;
[0043] a reducer chamber 4b;
[0044] a bottom oil channel 4c;
[0045] a notch structure 40 cast at the bottom of the housing 4, and two oil holes aligned with the notch structure 40 and leading to the motor chamber 4a and the reducer chamber 4b respectively, namely a first oil hole 40a and a second oil hole 40b, the notch structure 40, the first oil hole 40a and the second oil hole 40b all communicating with the bottom oil channel 4c.
[0046] In the embodiments of the present disclosure, in combination with Figure 5 As shown, the notch structure 40 is aligned with the first oil hole 40a and the second oil hole 40b, so that the notch structure 40 and the first oil hole 40a and the second oil hole 40b can be integrally formed by a casting process, without the need for secondary processing of the oil holes after casting, directly meeting the assembly requirements and avoiding subsequent machining processes. Compared with the traditional drilling process, the embodiments significantly improve the processing efficiency, reduce the manufacturing cost, and do not form burr structures, solving the problem of difficult removal of machining burrs.
[0047] As an embodiment, the first oil hole 40a and the second oil hole 40b correspond to a columnar body, which is connected with the corresponding solid mold structure of the notch structure 40, so as to form the notch structure 40 and the first oil hole 40a and the second oil hole 40b in the same casting process.
[0048] As shown in Figure 6 , which shows the first oil hole 40a of the embodiments, compared with Figure 6 and the first oil hole 1c shown in the prior art Figure 2 , the edge of the first oil hole 40a of the embodiments does not form a machining burr structure, and by optimizing the design of the casting mold, various hole shapes such as square can be formed to meet the oil passage function requirements. For example, the hole diameter of the first oil hole 40a is increased.
[0049] As shown in Figure 7 , which shows the second oil hole 40b of the embodiments, compared with Figure 7 and the second oil hole 1d shown in the prior art Figure 3 , it can be more obviously seen that the edge of the second oil hole 40b of the embodiments does not form a burr structure.
[0050] Further, by optimizing the design of the casting mold, the oil hole shapes of the first oil hole 40a and the second oil hole 40b can meet the oil passage function requirements, for example, the cross-sectional area and position of the oil hole are controlled by the accurate design of the casting mold to meet the fluid requirements of the oil passage. And ensure that the casting wall thickness is uniform, avoid stress concentration in the casting process.
[0051] By comparison Figure 4 With Figure 1 Because of the draft angle of the casting process, to ensure the cross-sectional area of the oil passage, the long oil passage pre-casting does not meet the boundary conditions, so the oil passage of the first oil hole 40a and the second oil hole 40b in this embodiment is short, which can be directly molded by the mold, and also saves cost.
[0052] As Figure 4 shown, in the electric drive device, the notch structure 40 is designed at the bottom of the housing 4, and the purpose is to let the oil in the motor chamber 4a and the reducer chamber 4b flow back to the bottom oil passage 4c through the first oil hole 40a and the second oil hole 40b respectively, avoiding the oil to stay in the gap, reducing the drag torque, and improving the efficiency.
[0053] In the casting design, a model structure corresponding to the notch structure 40 can be directly opened in the casting mold of the housing 1, and the notch structure 40 can be directly realized by casting.
[0054] In this embodiment, the notch structure 40 can refer to the notch in the bottom oil passage 4c area of the housing 4. For example, at the position of the bottom oil passage 4c corresponding to the motor chamber 4a and the reducer chamber 4b, the notch structure 40 is formed at the bottom of the bottom oil passage 4c, and the first oil hole 40a and the second oil hole 40b are formed at the top of the bottom oil passage 4c corresponding to the notch structure 40. In this way, the notch structure 40 is formed at the bottom of the bottom oil passage 4c, the first oil hole 40a and the second oil hole 40b are located at the top of the bottom oil passage 4c, and the top and bottom of the bottom oil passage 4c are two areas opposite in the vertical direction.
[0055] This design can cast the notch structure 40, the first oil hole 40a and the second oil hole 40b in the vertical direction at the same time, and the oil passage is short, which can be directly cast and reduce the cost.
[0056] In this embodiment, the first oil hole 40a and the second oil hole 40b directly lead to the bottom oil passage 4c and face the notch structure 40. This direct interconnection structure can simplify the design difficulty and cost of the casting mold of the housing 4.
[0057] In this case, the first oil hole 40a and the second oil hole 40b respectively extend into the motor chamber 4a and the reducer chamber 4b. As an implementation, a hollow first inner protrusion 41 and a hollow second inner protrusion 42 are respectively cast on the top of the bottom oil channel 4c, the first inner protrusion 41 extends into the motor chamber 4a, and the second inner protrusion 42 extends into the reducer chamber 4b. The first oil hole 40a is formed in the first inner protrusion 41, and the second oil hole 40b is formed in the second inner protrusion 42, so that the first oil hole 40a and the second oil hole 40b respectively extend into the motor chamber 4a and the reducer chamber 4b.
[0058] In this embodiment, the hollow first inner protrusion 41 and the hollow second inner protrusion 42 can be integrally cast with the shell 4, so that the bottom oil channel 4c and its notch structure 40, the first oil hole 40a and the second oil hole 40b can be made by the same casting process.
[0059] In the embodiments of the present disclosure, as shown in Figure 4 A cover plate 5 is provided at the position of the notch structure 40, and the cover plate 5 is used to seal the notch structure 40. The cover plate 5 is a separate structure from the shell 4. After the shell 4 is cast, the cover plate 5 is assembled to seal the notch structure 40.
[0060] In an embodiment, the cover plate 5 is mounted on the shell 4 by welding or bolting. Welding achieves fixed mounting between the cover plate 5 and the shell 4. The welding method is, for example, friction stir welding (FSW), which is a solid-state joining technique. A high-speed rotating stir head is inserted into the to-be-welded part of the welded material, and heat is generated between the stir head and the welded material. The welded material reaches a plastic state under the action of heat and mechanics, and then the plastic state of the material is stirred and mixed by moving the stir head along the welding joint. A dense weld is formed at the junction between the cover plate 5 and the notch structure 40.
[0061] Bolting can achieve detachable mounting between the cover plate 5 and the shell 4, which facilitates replacement of the cover plate 5 and facilitates maintenance and cleaning of the bottom oil channel 4c.
[0062] In the embodiments of the present disclosure, as shown in Figure 4 and Figure 8 A magnet 6 is mounted on the inner side of the cover plate 5. Here, the magnet 6 can adsorb metal impurities in the oil in the bottom oil channel 4c, so as to avoid the metal impurities flowing back to the corresponding chamber through the bottom oil channel 4c.
[0063] In this case, the cover plate 5 and the shell 4 are connected by bolting, achieving detachable connection, so that the metal impurities adsorbed on the magnet 6 can be cleaned periodically.
[0064] In the embodiment of the present disclosure, the magnet 6 can be fixed on the inner side of the notch structure 40 by magnetic attraction. As described above, the notch structure 40 is formed on the bottom of the bottom oil channel 4c, the embedded groove 4d can be cast on the side wall of the bottom oil channel 4c, the magnet 6 is embedded in the embedded groove 4d, and after the cover plate 5 is assembled, the magnet 6 is pre-tightened in the embedded groove 4d, so that the magnet 6 is fixed in the corresponding position in a more secure manner, and it is ensured that the magnet 6 will not be displaced or fall off due to vibration or external force.
[0065] In this embodiment, as shown in Figure 5 and Figure 8 , two magnets 6 are respectively installed on the two side walls of the bottom oil channel 4c, which is an example. The shape and number of the magnet 6 are not limited in this embodiment.
[0066] In one embodiment, as shown in Figure 8 , when the cover plate 5 is connected with the shell 4 by bolts, the bolt mounting position and the embedded groove 4d can be integrally formed when the shell 4 is cast, which improves the production efficiency of the product and avoids additional processing process. After casting, the magnet 6 and the cover plate 5 are respectively assembled, and the cover plate 5 and the shell 4 are fixed and connected by bolts.
[0067] The embedded groove 4d and the bolt mounting position are adjacent, which on the one hand makes the magnet 6 not to block the bolt assembly, and on the other hand makes the bolt to pre-tighten the magnet 6, for example, the magnet 6 can be connected with the surface of the side wall of the bottom oil channel 4c by magnetic attraction, and the bolt can fix the magnet 6 in the predetermined position by pressing or tightening.
[0068] Alternatively, the bolt does not directly fix the magnet 6 itself, but by pre-setting a space in the bottom oil channel 4c, the bolt is used to place the magnet 6 in the appropriate position.
[0069] As shown in Figure 4 , the magnet 6 is located below the second oil hole 40b and can directly attract metal impurities in the oil discharged during the operation of the speed reducer. This arrangement is considered to provide the required magnet mounting space at this position, and the gap between the corresponding support structure and the transmission structure in the speed reducer is small, which is more likely to be filled with oil. The oil is thrown out and the metal impurities in the oil can be directly attracted by the magnet 6.
[0070] In the embodiment of the present disclosure, as shown in Figure 4 and Figure 8 , the shell 4 is formed with an annular outward protruding portion 43 at the position of the notch structure 40, and the cover plate 5 is installed with the annular outward protruding portion 43 to seal the notch structure 40.
[0071] In this embodiment, the annular protrusion 43 is a part of the housing 4 and can be made in the same casting process. The annular protrusion 43 is located at the bottom of the housing 4 and is advantageous for the oil from the first oil hole 40a and the second oil hole 40b to be deposited and be collected in time.
[0072] Thus, as described above, when the cover plate 5 is bolted to the annular protrusion 43, the annular protrusion 43 can serve as an oil drain. By removing the bolts and the cover plate 5, the oil deposited in the annular protrusion 43 can be released.
[0073] The embodiments of the present disclosure also provide an electric drive device using the housing 4 of any of the above embodiments.
[0074] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure that come within known or customary practice within the art to which the application pertains. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the application are indicated by the appended claims.
Claims
1. A housing (4) for an electric drive device, characterized in that The following are formed in the housing (4): Motor chamber (4a); Reducer chamber (4b); Bottom oil passage (4c); The notch structure (40) cast at the bottom of the housing (4) and the two oil holes (40a, 40b) opposite to the notch structure (40) and respectively leading to the motor chamber (4a) and the reducer chamber (4b) are both connected to the bottom oil passage (4c).
2. Housing (4) for an electric drive arrangement according to claim 1, characterized in that The notch structure (40) is formed at the bottom of the bottom oil passage (4c), and the two oil holes (40a, 40b) are located at the top of the bottom oil passage (4c).
3. Housing (4) for an electric drive arrangement according to claim 2, characterized in that Hollow first inner protrusion (41) and second inner protrusion (42) are respectively cast on the top of the bottom oil passage (4c). The first inner protrusion (41) extends into the motor chamber (4a) and the second inner protrusion (42) extends into the reducer chamber (4b). The two oil holes (40a, 40b) are formed in the first inner protrusion (41) and the second inner protrusion (42) respectively.
4. Housing (4) for an electric drive arrangement according to claim 1, characterized in that A cover plate (5) is provided at the location of the notch structure (40), and the cover plate (5) is used to seal the notch structure (40).
5. Housing (4) for an electric drive arrangement according to claim 4, characterized in that The cover plate (5) is installed to the housing (4) by welding or bolting.
6. Housing (4) for an electric drive arrangement according to claim 4, characterized in that A magnet (6) is installed on the inside of the cover plate (5).
7. Housing (4) for an electric drive arrangement according to claim 6, characterized in that The notch structure (40) is formed at the bottom of the bottom oil passage (4c), and an embedded groove (4d) is cast on the side wall of the bottom oil passage (4c), and the magnet (6) is embedded in the embedded groove (4d).
8. Housing (4) for an electric drive arrangement according to claim 6, characterized in that The magnet (6) is located below the second oil hole (40b) leading to the reducer chamber (4b).
9. Housing (4) for an electric drive arrangement according to claim 4, characterized in that The housing (4) has an outwardly protruding annular protrusion (43) at the position of the notch structure (40), and the cover plate (5) is installed with the annular protrusion (43).
10. An electric drive device, characterized by The housing (4) for an electric drive device includes any one of claims 1-9.