Gear box casting structure and gear box

Abstract

The gearbox casting structure comprises a box body and a box cover, the box body and the box cover are both independent casting parts and form a containing cavity after covering, the containing cavity comprises a first cavity body and a second cavity body, first shaft holes are symmetrically formed in the two side walls of the first cavity body, second shaft holes are symmetrically formed in the two side walls of the second cavity body, and the first shaft holes are communicated with the second shaft holes. The center distance between the first shaft hole and the second shaft hole is adjustable. The first shaft hole and the second shaft hole are formed in the corresponding positions of the first cavity and the second cavity respectively, and universal production of gear box castings is achieved through the modular casting technology and the design that the center distance of the shaft holes of the same casting can be adjusted. Different model requirements of a series of units can be met only by adjusting the positions and the sizes of the shaft holes through machining, the mold development types and the machining procedures are reduced, the production cycle is remarkably shortened, the manufacturing cost is reduced, assembly errors and deformation are reduced, and the production efficiency and the unit quality are improved.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically to a gearbox casting structure and a gearbox. Background Technology

[0002] As a core component of high-speed power equipment, the performance of multi-shaft cantilever centrifugal compressors directly depends on the reliability and efficiency of parallel-shaft gearboxes. These gearboxes need to provide precise speed increase and power transmission for high-speed rotors. Traditional manufacturing methods mainly fall into two categories: welding and casting. However, welded gearboxes require multiple processes, resulting in long production cycles, high costs, and significant limitations. While casting technology can reduce processing steps through integrated molding, traditional cast gearboxes, due to their non-standardized design, are difficult to adapt to the diverse needs of multi-shaft cantilever compressors. Furthermore, casting processes require substantial initial mold investment, and existing casting technologies cannot balance the contradiction between customized needs and large-scale production. This invention proposes a new solution to address these issues. Utility Model Content

[0003] To overcome at least one of the aforementioned drawbacks, this utility model provides a gearbox casting structure and a gearbox. The objective of this utility model can be achieved by adopting the following technical solution:

[0004] In a first aspect, this application provides a gearbox casting structure, including a gearbox body and a gearbox cover, wherein the gearbox body and the gearbox cover are both independent castings and form a receiving chamber when closed. The receiving chamber includes a first chamber and a second chamber. The first chamber has symmetrical first shaft holes on its two side walls, and the second chamber has symmetrical second shaft holes on its two side walls. The center distance between the first shaft holes and the second shaft holes is adjustable.

[0005] In one possible implementation, the cross-sections of the first chamber and the second chamber are waist-shaped, and the major axis directions of the first chamber and the second chamber are both perpendicular to the axis of the drive shaft.

[0006] In one possible implementation, both the first chamber and the second chamber include two symmetrical semicircular ends and parallel extending straight connecting segments, the two ends of which are tangentially connected to the diameter edges of the two semicircular ends, respectively.

[0007] In one possible implementation, the gearbox casting structure is made of ductile iron.

[0008] In one possible implementation, the lid includes a first half-cavity and a third half-cavity, the body includes a second half-cavity and a fourth half-cavity, the first chamber includes the first half-cavity and the second half-cavity, and the second chamber includes the third half-cavity and the fourth half-cavity.

[0009] In one possible implementation, third shaft holes corresponding to the drive shaft are symmetrically formed on both side walls of the receiving chamber. The axis of the third shaft hole is located between the first chamber and the second chamber and is parallel to the axes of the first shaft hole and the second shaft hole.

[0010] In one possible implementation, along the long axis direction of the first chamber and the second chamber, the minimum distance between the axis of the first shaft hole and the axis of the third shaft hole is A, and the maximum distance between the axis of the first shaft hole and the axis of the third shaft hole is A+Δa, where 1<A+Δa: A≤1.14;

[0011] Along the long axis of the first chamber and the second chamber, the minimum distance between the axis of the second shaft hole and the axis of the third shaft hole is B, and the maximum distance between the axis of the second shaft hole and the axis of the third shaft hole is B+△b, where 1<B+△b: B≤1.15.

[0012] A second aspect of this application provides a gearbox including the gearbox casting structure described in any one of the first aspects.

[0013] In one possible implementation, the gearbox includes:

[0014] A drive shaft is disposed in a third shaft hole, and a drive gear is provided on the drive shaft;

[0015] A first driven shaft is disposed in a first shaft hole, and a first driven gear located in the first chamber is provided on the first driven shaft, and the driving gear meshes with the first driven gear;

[0016] The second driven shaft is disposed in the second shaft hole, and the second driven gear is disposed on the second driven shaft and located in the second chamber. The driving gear meshes with the second driven gear.

[0017] In one possible implementation, the housing includes a plurality of lubricating oil channels, which respectively extend to the first shaft hole, the second shaft hole, and the third shaft hole.

[0018] The beneficial technical effects of this utility model are as follows: According to the present disclosure, the gearbox casting structure and gearbox include an independently cast housing and a housing cover. After the housing and housing cover are closed, a first chamber and a second chamber are formed. As needed, a first shaft hole and a second shaft hole are respectively opened at corresponding positions in the first chamber and the second chamber. Through modular casting process and adjustable center distance design of shaft holes in the same casting, the gearbox casting can be universally produced. Only the position and size of the shaft holes need to be adjusted by machining to adapt to the different model requirements of serialized units. This reduces the types of mold development and processing steps, significantly shortens the production cycle and reduces manufacturing costs. It also reduces assembly errors and deformation, and improves production efficiency and unit quality. Attached Figure Description

[0019] The following are given by way of example and without limitation in the accompanying drawings:

[0020] Figure 1 This application provides a schematic diagram of the structure of the lid and body of the box according to an embodiment.

[0021] Figure 2 This invention provides a schematic diagram of the gearbox casting structure and a gearbox at one angle, as shown in an embodiment of this application.

[0022] Figure 3 This invention provides a schematic diagram of a gearbox casting structure and the internal structure of a gearbox at one angle, according to an embodiment of this application.

[0023] Figure 4 This invention illustrates another gearbox casting structure and a schematic diagram of the internal structure of the gearbox at one angle, provided by an embodiment of this application.

[0024] Figure 5 This invention provides a schematic diagram of the gearbox casting structure and the gearbox from another angle, as shown in an embodiment of this application.

[0025] Figure 6 The diagram shows a gearbox casting structure and a partial structural schematic of the gearbox provided in an embodiment of this application (the gearbox cover is not shown).

[0026] Figure 7 A schematic diagram of the lubrication oil passages inside the housing provided in an embodiment of this application is shown.

[0027] In the picture:

[0028] 1. Cover; 2. Housing; 3. Drive shaft; 31. Drive gear; 4. First driven shaft; 41. First driven gear; 5. Second driven shaft; 51. Second driven gear; 6. Lubricating oil passage;

[0029] 100, First chamber; 110, First half-cavity; 120, Second half-cavity; 200, Second chamber; 210, Third half-cavity; 220, Fourth half-cavity; 310, First shaft hole; 320, Second shaft hole; 330, Third shaft hole. Detailed Implementation

[0030] In the following detailed disclosure, these embodiments are fully described with reference to the accompanying drawings. In order to enable those skilled in the art to understand and clarify the technical solution of this utility model more clearly, the embodiments described below are not limited thereto. The present utility model will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0031] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] The first aspect of this application, as Figures 1-7 As shown, a gearbox casting structure is provided, including a gearbox body 2 and a gearbox cover 1. The gearbox body 2 and the gearbox cover 1 are both independent castings and form a receiving chamber after being closed. The receiving chamber includes a first chamber 100 and a second chamber 200. First shaft holes 310 are symmetrically opened on the two side walls of the first chamber 100, and second shaft holes 320 are symmetrically opened on the two side walls of the second chamber 200. The center distance between the first shaft hole 310 and the second shaft hole 320 is adjustable.

[0034] The gearbox casting structure provided in this embodiment, such as Figure 1 and Figure 2As shown, the housing 2 and the cover 1 are cast as a whole to form a modular integrated assembly. A set of casting molds is used to cast a set of gearbox castings, which avoids the misalignment problem caused by traditional welding, improves structural stability, keeps the machining reference surface of key shaft holes consistent, reduces the risk of cumulative assembly errors and deformation, ensures gear meshing accuracy, and improves the reliability of unit operation.

[0035] The gearbox casting structure provided in this embodiment, such as Figure 3 and Figure 4 As shown, the first chamber 100 and the second chamber 200 are formed by the housing 2 and the cover 1 being closed. As needed, the first shaft hole 310 and the second shaft hole 320 are respectively opened at corresponding positions in the first chamber 100 and the second chamber 200. Through modular casting process and adjustable center distance design of shaft hole of the same casting, the gearbox casting can be universally produced. Only the position and size of shaft hole need to be adjusted by machining to adapt to the different model requirements of serialized units. Only one set of casting mold is needed to produce housing 2 and cover 1 that can adapt to multiple center distance requirements, which greatly reduces the types of mold development and mold change time. The same casting can be flexibly adapted to the gear transmission parameter adjustment requirements of serialized units, significantly shorten the new product development cycle, significantly shorten the production cycle and reduce manufacturing costs. It also reduces assembly errors and deformation, and improves production efficiency and unit quality.

[0036] In one possible implementation, such as Figures 2-4 As shown, the cross-sections of the first chamber 100 and the second chamber 200 are waist-shaped, and the major axis directions of the first chamber 100 and the second chamber 200 are both perpendicular to the axis of the drive shaft 3.

[0037] The first chamber 100 and the second chamber 200 have a waist-shaped cross-section. The long axis of the waist-shaped chamber is perpendicular to the axis of the drive shaft 3, which maximizes the radial expansion of the internal space of the chamber along the gear meshing direction, provides symmetrical support space for the installation of the gear set, and provides installation freedom for large gears or complex tooth profiles. The vertical layout of the long axis of the waist-shaped chamber combined with the adjustable center distance design allows for the adaptation to different gear modules or transmission ratio requirements by adjusting the position of the shaft hole, and supports the reuse of the same casting across different series of models.

[0038] The center line connecting the first shaft hole 310 and the second shaft hole 320 is parallel to the long axis of the waist-shaped cavity. By adjusting the machining positions of the first shaft hole 310 and the second shaft hole 320 on the side wall of the waist-shaped cavity, different gear meshing center distance requirements can be met. The vertical layout of the long axis of the waist-shaped cavity makes the radial force transmission path generated by gear meshing consistent with the wall thickness direction of the straight section of the cavity, forming a continuous stress dispersion path and avoiding local deformation.

[0039] In the casting models of box body 2 and box cover 1, positioning marks can be made along the preset long axis direction, such as axis grooves, to ensure the perpendicular relationship between the machined shaft hole and the long axis of the cavity.

[0040] The cavity is formed by a separate casting process of box body 2 and box cover 1. The parting surface of box body 2 and box cover 1 is parallel to the long axis of the waist-shaped cavity, ensuring no interference during casting demolding and guaranteeing the geometric accuracy of the cavity outline.

[0041] Understandably, a flange structure matching the waist-shaped cavity can also be set on the mating surface of the box body 2 and the box cover 1. The mortise and tenon joint can achieve seamless connection when the cavity is closed, avoiding internal stress concentration caused by misalignment of the parting surface.

[0042] In one possible implementation, such as Figures 2-4 As shown, both the first chamber 100 and the second chamber 200 include two symmetrical semi-circular ends and parallel extending straight connecting segments, with the two ends of the straight connecting segments being tangentially connected to the diameter edges of the two semi-circular ends, respectively.

[0043] The first chamber 100 and the second chamber 200 are both capsule-like in shape, consisting of two symmetrical semicircular ends and a straight connecting segment. The two ends of the straight segment are tangent to the diameter edge of the semicircular ends, forming a continuous closed contour without bends.

[0044] The inner wall of the cavity can be a continuous smooth curved surface to ensure that the curvature of the connection area between the semi-circular end and the straight segment gradually changes, eliminating local convexity.

[0045] In particular, the wall thickness direction of the straight section of the waist-shaped chamber is consistent with the radial load direction of the gear. Through the continuous gradual change of wall thickness design, that is, the thickness increases from the semi-circular end to the center of the straight section, the gear meshing force is evenly transmitted to the overall structure of the housing 2, avoiding stress concentration. The vertical layout of the long axis disperses the centrifugal force of the gear along the short axis of the chamber. Combined with the high damping characteristics of ductile iron, it further suppresses vibration transmission and reduces noise radiation efficiency.

[0046] In one possible implementation, the material used to fabricate the gearbox casting structure includes ductile iron.

[0047] The high fluidity and low solidification shrinkage of ductile iron are utilized to achieve precise forming of the complex geometry of the inner cavity of the housing 2 and the cover 1. The high strength and toughness of ductile iron enable it to withstand the centrifugal force, meshing impact and additional force of shaft adjustment of high-speed gears, avoiding the risk of brittle fracture of traditional gray cast iron. The overall rigidity of the cast housing 2 suppresses gear shaft deflection, reduces additional vibration caused by shaft asymmetry, and extends the service life of bearings and seals.

[0048] Among them, the high damping coefficient of ductile iron significantly reduces the transmission efficiency of high-frequency vibration energy in gear transmission. Compared with welded steel structure housing 2, it can reduce broadband noise radiation, especially the suppression effect on gear meshing order noise. Ductile iron housing 2 is not sensitive to surface scratches and corrosion, and can still maintain long-term noise reduction performance under harsh working conditions, reduce maintenance frequency, and ensure that housing 2 meets the requirements of noise reduction and load bearing at the same time.

[0049] In one possible implementation, such as Figure 2 and Figure 6 As shown, the box cover 1 includes a first half-cavity 110 and a third half-cavity 210, the box body 2 includes a second half-cavity 120 and a fourth half-cavity 220, the first chamber 100 includes a first half-cavity 110 and a second half-cavity 120, and the second chamber 200 includes a third half-cavity 210 and a fourth half-cavity 220.

[0050] The lid 1 and the body 2 are made using a split-molding process. The lid 1 integrates the first half-cavity 110 and the third half-cavity 210, corresponding to the upper half of the first chamber 100 and the upper half of the second chamber 200. The body 2 integrates the second half-cavity 120 and the fourth half-cavity 220, corresponding to the lower half of the first chamber 100 and the lower half of the second chamber 200. By fitting the lid together, the first chamber 100 and the second chamber 200 are formed, which reduces the mold complexity of individual castings, reduces the risk of casting shrinkage and deformation, and improves the dimensional consistency of the chamber contour. The independent half-cavity design of the lid 1 and the body 2 shortens the overall assembly cycle.

[0051] The parting surface is designed on a symmetrical plane along the long axis of the chamber, ensuring that the geometric contours of each half of the chamber are seamlessly connected after the cover 1 and the body 2 are closed, thus avoiding misalignment that could lead to displacement of the internal flow channels or support structures.

[0052] In particular, by combining the damping characteristics of ductile iron, the independent first chamber 100 and second chamber 200 limit the propagation range of gear meshing vibration within the housing 2, further reducing overall noise radiation.

[0053] In one possible implementation, such as Figure 3 , Figure 4 and Figure 6 As shown, symmetrical third shaft holes 330 corresponding to the drive shaft 3 are opened on both sides of the receiving chamber. The axis of the third shaft hole 330 is located between the first chamber 100 and the second chamber 200 and is parallel to the axis of the first shaft hole 310 and the second shaft hole 320.

[0054] Specifically, a third axial hole 330 is provided symmetrically on both sides of the receiving chamber, and the axis of the third axial hole 330 is located in the middle dividing area between the first chamber 100 and the second chamber 200.

[0055] Furthermore, the third shaft hole 330 can be parallel to the first shaft hole 310 and the second shaft hole 320 to form a multi-axis coplanar layout. The approximately symmetrical layout of the first shaft hole 310 and the second shaft hole 320 relative to the third shaft hole 330 enables the radial forces of the first driven shaft 4 and the second driven shaft to form a force couple balance through the driving shaft 3, reducing the risk of deformation of the housing 2 under unilateral stress and extending the bearing life. The parallelism between the shaft holes reduces the off-center load friction during gear meshing, further suppressing high-frequency vibration and noise.

[0056] In one possible implementation, such as Figures 2-4 As shown, along the major axis of the first chamber 100 and the second chamber 200, the minimum distance between the axis of the first shaft hole 310 and the axis of the third shaft hole 330 is A, and the maximum distance between the axis of the first shaft hole 310 and the axis of the third shaft hole 330 is A+△a, where 1<A+△a: A≤1.14; along the major axis of the first chamber 100 and the second chamber 200, the minimum distance between the axis of the second shaft hole 320 and the axis of the third shaft hole 330 is B, and the maximum distance between the axis of the second shaft hole 320 and the axis of the third shaft hole 330 is B+△b, where 1<B+△b: B≤1.15.

[0057] It is understandable that, based on the asymmetric transmission characteristics of the gear speed-increasing compressor, the shaft hole spacing can be designed differently along the long axis of the first chamber 100 and the second chamber 200. The gradual design of the shaft hole spacing allows for differentiated arrangement of the gear sets in the first chamber 100 and the second chamber 200, which is suitable for the dynamic characteristics of the speed-increasing compressor, such as low inertia start-up and high speed stable operation.

[0058] The distance between the first shaft hole 310 and the third shaft hole 330 gradually increases from a minimum value A to A+△a, where △a is the increment, and the ratio of A to △a is within 1:0.14. The distance between the second shaft hole 320 and the third shaft hole 330 gradually increases from a minimum value B to B+△b, where △b is the increment, and the ratio of B to △b is within 1:0.15. The proportional constraints of the distance increment △a≤14% and △b≤15% ensure that the centrifugal coupling effect of the drive shaft 3, the first driven shaft 4, and the second driven shaft 5 is controllable under the asymmetric layout, and suppresses the lateral vibration of the high-speed gear.

[0059] It is understandable that the ratio of △a to △b is not limited to the above range. By adjusting the incremental ratio of △a to △b, the same cavity structure can adapt to various growth rate requirements and meet the needs of rapid product iteration.

[0060] The second aspect of this application, as Figures 1-7 As shown, a gearbox is provided, including a gearbox casting structure according to any one of the first aspects.

[0061] In this embodiment, the gearbox is manufactured using a modular casting process of independent housing 2 and housing cover 1, which enables the standardized prefabrication of the first chamber 100 and the second chamber 200. The same casting can be adapted to the shaft hole center distance requirements of different models of units by only adjusting the processing parameters, which greatly reduces the cost of mold development and production line transformation. It also allows for flexible adjustment of shaft hole position and diameter through subsequent machining, supports rapid response to customized needs, and shortens the product delivery cycle.

[0062] The integration of the gear set and bearing system into an independent chamber reduces external connecting parts, lowers the overall volume and weight, and meets the requirements of cantilever impeller centrifugal compressors for lightweighting and space efficiency. The precision casting fit between the housing 2 and the cover 1 also simplifies the assembly process and significantly improves assembly efficiency.

[0063] In one possible implementation, such as Figure 3 and Figure 4 As shown, the gearbox includes a drive shaft 3, a first driven shaft 4, and a second driven shaft 5. The drive shaft 3 is disposed in a third shaft hole 330 and is provided with a drive gear 31. The first driven shaft 4 is disposed in a first shaft hole 310 and is provided with a first driven gear 41 located in a first chamber 100. The drive gear 31 meshes with the first driven gear 41. The second driven shaft 5 is disposed in a second shaft hole 320 and is provided with a second driven gear 51 located in a second chamber 200. The drive gear 31 meshes with the second driven gear 51.

[0064] The drive shaft 3 is installed in the third shaft hole 330. The drive shaft 3 in the third shaft hole 330 is designed to support bidirectional power input and is compatible with external connection methods such as direct drive of motor or belt drive. The drive gear 31 on the drive shaft 3 meshes with the first driven gear 41 of the first chamber 100 and the second driven gear 51 of the second chamber 200 to form a dual power transmission path and realize the splitting of input power to two independent driven shafts.

[0065] The first driven shaft 4 and the second driven shaft 5 are positioned through the first shaft hole 310 and the second shaft hole 320, respectively. The axis of the first shaft hole 310 and the axis of the second shaft hole 320 can be parallel to the axis of the third shaft hole 330 to ensure that the gear meshing lines are coplanar and reduce off-center load friction.

[0066] Understandably, by replacing the first driven gear 41 and the second driven gear 51 with different numbers of teeth, the same gearbox can quickly adapt the gear ratio combination to meet the needs of different working conditions.

[0067] In one possible implementation, such as Figure 7 As shown, the housing 2 includes a plurality of lubricating oil channels 6, which extend to the first shaft hole 310, the second shaft hole 320 and the third shaft hole 330 respectively.

[0068] The main oil passage and branch oil passage network can be pre-embedded during the casting of the housing 2. The main oil passage and branch oil passage are connected. The branch oil passage is connected to the bearing chamber of the first shaft hole 310, the second shaft hole 320 and the third shaft hole 330 in a radial or tree-like structure. This realizes the delivery of lubricating oil from one end to multiple lubrication points of the gearbox, and the pipeline layout is simple and saves space.

[0069] Among them, the oil injection interface design in the gear meshing area can be a multi-stage manifold structure, with inclined injection holes set at the end of the branch oil passages, the direction of which is aligned with the gear meshing contact line to ensure that the lubricating oil covers the full width of the tooth surface.

[0070] Among them, the lubrication channel 6 ensures that a stable oil film can be formed in the bearing rollers and gear meshing area during low-speed start-up and high-speed operation, reducing the risk of dry friction. The uniform oil film can also suppress gear meshing impact noise, and atomized lubrication further attenuates the transmission of high-frequency vibration. Sufficient lubrication of the bearing rollers reduces abnormal vibration caused by local lack of oil and improves transmission smoothness.

[0071] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0073] In view of the detailed description above, these and other changes can be made to these embodiments. This written description includes embodiments of the best mode disclosed in this utility model. The patent scope of this utility model is defined by the claims, which are not limited by this disclosure. The protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in this utility model, based on the technical solution and concept of this utility model, are within the protection scope of this utility model.

Claims

1. A gearbox casting structure, characterized in that, The device includes a housing (2) and a lid (1). The housing (2) and the lid (1) are both independent castings and form a receiving chamber when closed. The receiving chamber includes a first chamber (100) and a second chamber (200). The first chamber (100) has symmetrical first shaft holes (310) on its two side walls, and the second chamber (200) has symmetrical second shaft holes (320) on its two side walls. The center distance between the first shaft hole (310) and the second shaft hole (320) is adjustable.

2. The gearbox casting structure according to claim 1, characterized in that, The cross-sections of the first chamber (100) and the second chamber (200) are waist-shaped, and the major axis directions of the first chamber (100) and the second chamber (200) are perpendicular to the axis of the drive shaft (3).

3. The gearbox casting structure according to claim 2, characterized in that, Both the first chamber (100) and the second chamber (200) include two symmetrical semicircular ends and parallel extending straight connecting segments, the two ends of which are tangentially connected to the diameter edges of the two semicircular ends, respectively.

4. The gearbox casting structure according to claim 3, characterized in that, The gearbox casting structure is made of ductile iron.

5. The gearbox casting structure according to claim 2, characterized in that, The lid (1) includes a first half-cavity (110) and a third half-cavity (210), the box body (2) includes a second half-cavity (120) and a fourth half-cavity (220), the first chamber (100) includes the first half-cavity (110) and the second half-cavity (120), and the second chamber (200) includes the third half-cavity (210) and the fourth half-cavity (220).

6. The gearbox casting structure according to claim 2, characterized in that, The two side walls of the receiving chamber are symmetrically provided with third shaft holes (330) corresponding to the drive shaft (3). The axis of the third shaft hole (330) is located between the first chamber (100) and the second chamber (200) and is parallel to the axes of the first shaft hole (310) and the second shaft hole (320).

7. The gearbox casting structure according to claim 6, characterized in that, Along the long axis of the first chamber (100) and the second chamber (200), the minimum distance between the axis of the first shaft hole (310) and the axis of the third shaft hole (330) is A, and the maximum distance between the axis of the first shaft hole (310) and the axis of the third shaft hole (330) is A+△a, where 1<A+△a: A≤1.14; Along the long axis of the first chamber (100) and the second chamber (200), the minimum distance between the axis of the second shaft hole (320) and the axis of the third shaft hole (330) is B, and the maximum distance between the axis of the second shaft hole (320) and the axis of the third shaft hole (330) is B+△b, where 1<B+△b: B≤1.

15.

8. A gearbox, characterized in that, Includes the gearbox casting structure as described in any one of claims 1-7.

9. The gearbox according to claim 8, characterized in that, include: A drive shaft (3) is provided, the drive shaft (3) is disposed in a third shaft hole (330), and a drive gear (31) is provided on the drive shaft (3); A first driven shaft (4) is provided in a first shaft hole (310). A first driven gear (41) is provided on the first driven shaft (4) in the first chamber (100). The driving gear (31) meshes with the first driven gear (41). The second driven shaft (5) is disposed in the second shaft hole (320). The second driven shaft (5) is provided with a second driven gear (51) located in the second chamber (200). The driving gear (31) meshes with the second driven gear (51).

10. The gearbox according to claim 9, characterized in that, The housing (2) includes a plurality of lubricating oil channels (6), which extend to the first shaft hole (310), the second shaft hole (320) and the third shaft hole (330) respectively.

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