A low-pressure casting mold for a gearbox housing

Abstract

This invention discloses a low-pressure casting mold for a gearbox housing, comprising an inner adjustment assembly, an outer adjustment assembly, and a lifting assembly. The inner adjustment assembly is equipped with a bottom mold and a core mold assembly. Its annular array of multiple long and short-stroke inner plates allows radial movement, with the long-stroke plates having a greater stroke than the short-stroke plates. These plates are alternately distributed and drive portions of the core mold, enabling step-by-step sequential contraction and demolding of the core mold within the complex internal cavity, effectively avoiding motion interference. The outer adjustment assembly drives the outer mold to open and close synchronously through multiple radially moving outer plates, ensuring dimensional accuracy. The lifting assembly is located at the axis and is used to eject the casting. This invention solves the problems of sequential demolding, synchronous movement, and power integration by controlling all actions through a single drive source via a split-transmission system, offering advantages such as high precision, high efficiency, and high reliability.

Description

Technical Field

[0001] This invention relates to the field of automotive manufacturing technology, specifically a low-pressure casting mold for a gearbox housing. Background Technology

[0002] As a key structural component of the automotive transmission system, the gearbox housing needs to house various precision parts such as gear sets, clutches, and torque converters, and incorporates complex oil passages, reinforcing ribs, and irregularly shaped mounting holes. These housings typically have complex structures, uneven wall thicknesses, and extremely high requirements for the dimensional accuracy, surface quality, and overall mechanical properties of their internal cavities. Traditional sand casting or gravity casting methods are insufficient to meet these high precision and performance requirements. Low-pressure casting technology, due to its advantages of stable filling, good feeding effect, and high casting density, has become the preferred process for producing such complex thin-walled housings.

[0003] In low-pressure casting, mold design directly affects the molding quality and production efficiency of the casting. This is especially true for components like gearbox housings, which have deep cavities, multiple bosses, and complex internal structures. Their molds typically require a multi-piece, modular core and cavity structure for demolding. Existing low-pressure casting molds often experience difficulties in demolding during mold opening and closing due to movement interference between core components or between the core and the casting structure, leading to difficulties in demolding and even damage to the casting or mold. Furthermore, due to the complex internal structure of the gearbox housing, the large number of cores, and the significant differences in their stroke, coordinating the core-pulling sequence and stroke of each core, and achieving stable and efficient demolding within a limited space, is a key challenge in mold design.

[0004] On the other hand, existing molds mostly use independent hydraulic or pneumatic systems to control the movement of each core, which is complex, costly, and difficult to guarantee synchronization, affecting mold closing accuracy and production efficiency. Meanwhile, the casting ejection mechanism and the core drive mechanism are often independent of each other, increasing the overall structural complexity and failure rate. Therefore, there is an urgent need for a highly integrated, coordinated, and automated low-pressure casting mold capable of sequential core pulling and ejection to meet the needs of high-quality, high-efficiency production of gearbox housings.

[0005] In summary, the existing technology lacks a high-efficiency, low-pressure casting mold that can effectively coordinate the sequential movements of multiple cores, avoid motion interference, and integrate ejection functions for the precision forming of gearbox housings. Summary of the Invention

[0006] To address the aforementioned shortcomings in existing technologies, the present invention aims to provide a low-pressure casting mold for gearbox housings. This mold solves core challenges in the low-pressure casting of complex gearbox housings, such as sequential demolding, synchronous motion, power integration, and automated control. It combines the advantages of high precision, high efficiency, and high reliability, and has extremely high industrial application value.

[0007] The technical solution adopted by the present invention to achieve the above objectives is: a low-pressure casting mold for a gearbox housing, comprising:

[0008] The inner adjustment assembly includes an inner mold and a core mold assembly mounted on the inner adjustment assembly. The inner adjustment assembly includes multiple sets of long-range and short-range assembly inner plates arranged in a circular array. The long-range and short-range assembly inner plates are arranged alternately and both run radially. The radial travel of the long-range assembly inner plates is greater than that of the short-range assembly inner plates. The core mold assembly is mounted on each set of long-range and short-range assembly inner plates. The bottom mold is located at the bottom of the inner adjustment assembly and arranged around the core mold assembly.

[0009] The external adjustment assembly and the outer mold mounted on the built-in external adjustment assembly, wherein the external adjustment assembly includes multiple sets of assembly outer plates arranged in a ring array, each set of assembly outer plates running radially and arranged on the outside of the internal adjustment assembly, and each set of assembly outer plates is equipped with the outer mold.

[0010] A lifting assembly is disposed at the axis of the inner adjustment assembly and is used to push the cast gearbox housing upward.

[0011] Based on the above technical solutions, in order to ensure that the long-range assembly inner panel and the short-range assembly outer panel can achieve radial telescopic posture adjustment, the following technical solutions are provided.

[0012] The internal adjustment assembly also includes an adjustment shaft and adjustment sleeves A and B, connecting rod A and connecting rod B arranged around the adjustment shaft and moving axially. The adjustment shaft has wheel grooves A and B with non-intersecting trajectories on its periphery. The inner side of the adjustment sleeve A is equipped with a pin A that is matched with the wheel groove A, and the inner side of the adjustment sleeve B is equipped with a pin B that is matched with the wheel groove B.

[0013] Both ends of the connecting rod A are hinged to the long-range assembly inner plate and the adjusting sleeve A, respectively, and both ends of the connecting rod B are hinged to the short-range assembly inner plate and the adjusting sleeve B, respectively.

[0014] Based on the above technical solutions, in order to realize the sequential extension and retraction of the long-range assembly outer plate and the short-range assembly outer plate in time, so as to meet the requirement of efficient mold opening of the core mold assembly in a narrow space, the following technical solutions are provided.

[0015] The wheel groove A includes a spiral groove A and an circumferential groove A connected together. The wheel groove B includes a spiral groove B and an circumferential groove B connected together. When the pin A is in the spiral groove A, the pin B is exactly in the circumferential groove B. When the pin A is in the circumferential groove A, the pin B is exactly in the spiral groove B.

[0016] Based on the above technical solutions, in order to ensure that all components involved in the internal adjustment assembly can be stably assembled and operate stably in the set manner, the following technical solutions are provided.

[0017] It also includes a mounting base and an inner sleeve. The mounting base is fixedly connected to a coaxially arranged assembly seat and mounting base. The mounting base is arranged on the outside of the assembly seat and is stepped. The bottom mold is fixedly installed on the assembly seat and arranged around the assembly seat. The inner sleeve is fixedly installed at the axis of the mounting base. The end of the sleeve is fixedly installed with a mounting top seat.

[0018] The adjusting shaft is arranged at the center of the inner sleeve and is rotatably connected to the mounting top and mounting base. The mounting top and mounting base are provided with radially distributed long-stroke guide grooves and short-stroke guide grooves. Both ends of the long-stroke assembly inner plate are fixedly connected to guide seats A that are slidably combined with the long-stroke guide grooves. Both ends of the short-stroke assembly inner plate are fixedly connected to guide seats B that are slidably combined with the short-stroke guide grooves.

[0019] Based on the above technical solutions, in order to ensure that the long-range assembly inner plate and the short-range assembly inner plate can be poweredly connected to the adjusting shaft in the inner sleeve, and to ensure the stable layout of the core mold assembly and to achieve the shaping of the inner cavity of the gearbox housing, the following technical solutions are provided.

[0020] Guide shaft A and guide shaft B are fixedly connected to the inner walls of the long-range assembly inner plate and the short-range assembly inner plate, respectively. Guide shaft A and guide shaft B are slidably inserted into the inner sleeve. Connecting rod A and connecting rod B are hinged to the inner ends of guide shaft A and guide shaft B, respectively.

[0021] The core mold assembly includes a top core mold and side core molds. The top core mold is fixedly installed on the mounting top seat, and the side core molds are fixedly installed on the outer walls of each group of long-range assembly inner plates and short-range assembly inner plates.

[0022] Based on the above technical solutions, in order to ensure that each group of assembly plates in the external adjustment component can be stably assembled and operated, the following technical solutions are provided.

[0023] It also includes a middle sleeve and an outer sleeve that are fixedly installed on the mounting base and coaxially arranged. The middle sleeve is arranged on the outside of the mounting base, and the outer mounting plate is arranged on the inside of the middle sleeve. The end of the middle sleeve and the mounting base are provided with radially distributed guide grooves. Both ends of the outer mounting plate are fixed with guide seats C that are slidably combined with the guide grooves.

[0024] The external adjustment assembly also includes multiple sets of upper and lower adjusting screws and drive shafts arranged in a circular array. A swivel joint is fixed to the guide seat C. The upper and lower adjusting screws are rotatably mounted on the middle sleeve and the mounting base, respectively. The swivel joints at both ends of the assembly outer plate are swivelly connected to the upper and lower adjusting screws, respectively. The drive shaft is rotatably mounted to the outside of the middle sleeve and its two ends are poweredly connected to the upper and lower adjusting screws, respectively. The lower adjusting screw is poweredly connected to the adjusting shaft.

[0025] Based on the above technical solutions, in order to ensure that the adjusting shaft can drive each set of lower adjusting screws to operate synchronously and stably when it is running, thereby realizing the stable transmission of power to the external adjusting components, the following technical solutions are provided.

[0026] A sun gear is fixedly connected to the bottom center of the adjusting shaft. Multiple sets of planetary gears arranged outside the sun gear are rotatably mounted on the bottom of the mounting base. The sun gear and planetary gears are meshed. A drive bevel gear is fixedly connected to the center of the axis of each set of planetary gears. A transmission bevel gear is fixedly connected to the inner end of the lower adjusting screw. The drive bevel gear and transmission bevel gear at the corresponding positions are meshed.

[0027] Based on the above technical solutions, in order to ensure that the lifting assembly can be stably assembled and operated at the axial position of the internal adjustment assembly, and to realize the lifting and unloading of the cast gearbox housing, the following technical solutions are provided.

[0028] The lifting assembly includes a lifting rod and a lifting seat fixed to the top of the lifting rod. The lifting rod is arranged at the axis of the adjusting shaft and extends to the outside of the mounting seat. The lifting seat is arranged at the axis of the mounting seat.

[0029] Based on the above technical solutions, in order to ensure that the lifting rod in the lifting assembly can achieve stable lifting and lowering movements, ensure that the adjusting shaft in the internal adjusting assembly can operate stably, and ensure that power is transmitted stably to both, the following technical solutions are provided.

[0030] It also includes a drive assembly, which includes a drive motor, a shunt transmission mechanism, and a matching combination of worm A, worm wheel A, worm B, and worm wheel B. The drive motor is connected to the worm A and worm B through the shunt transmission mechanism. The worm wheel A is fixed to the bottom end of the adjusting shaft. The bottom end of the lifting rod is coaxially fixed with a threaded rod. The axis of the worm wheel B is screwed to the threaded rod.

[0031] Based on the above technical solutions, in order to ensure that the power splitting transmission mechanism can stably receive the power from the drive motor and split and transmit the power to worm A and worm B, the following technical solutions are provided.

[0032] The shunt drive mechanism includes an annular electromagnet, and a driving disk and a driven disk symmetrically arranged at both ends of the annular electromagnet. The output shaft of the driving motor is coaxially fixed with a driving shaft, and the two driving disks are both fixed to the driving shaft. An end face gear A running axially is assembled in the driving disk, and an end face gear B arranged opposite to the end face gear A is fixed on the driven disk. Multiple permanent magnets that are slidably inserted into the driving disk are fixed on the end face gear A, and the two driven disks are respectively in dynamic connection with a worm A and a worm B.

[0033] Advantages of the present invention:

[0034] 1. Effectively avoids movement interference and realizes smooth demoulding of complex inner cavities. By dividing the core mold assembly into two groups respectively driven by a long-range assembly inner plate and a short-range assembly inner plate, and using special wheel grooves A and B with spiral grooves and circumferential grooves, the two groups of core molds are controlled to shrink step by step in strict chronological order. After the long-range core mold shrinks to make space, the short-range core mold shrinks, so that in the extremely complex and space-limited inner cavity of the gearbox housing, various core molds are perfectly avoided from colliding or interfering with the casting's own structure during the core pulling process, greatly improving the success rate and reliability of demoulding.

[0035] 2. Realizes the linkage and synchronization of multiple sets of molds, ensuring the mold closing accuracy and casting quality: By driving the side core molds on all inner adjustment components through a set of adjusting shafts, and synchronously distributing the power to all lower adjusting lead screws through a sun gear and planetary gear system, and then driving all assembled outer plates and the outer molds thereon to move radially synchronously. This design of a single power source and multi-channel synchronous transmission ensures the high consistency and synchronization of the actions of all inner molds and outer molds during mold closing and mold opening, avoiding problems such as misalignment and flash caused by asynchronous actions, and effectively ensuring the dimensional accuracy and profile quality of the casting.

[0036] 3. High degree of integration and automation, significantly improving production efficiency. Highly integrating the three major functional modules of inner mold adjustment, outer mold adjustment, and ejection, and realizing the automatic switching of the power flow direction according to the process requirements with a single driving motor through a shunt drive mechanism. The entire mold opening and ejection process is automatically continuous, without multiple independent driving devices or frequent manual intervention, greatly shortening the production cycle and improving the casting efficiency.

[0037] 4. Stable and reliable operation. The core transmission components use a worm and worm gear mechanism for power transmission and deceleration. Its inherent reverse self-locking characteristic can automatically lock after the inner mold, outer mold, and lifting components reach the predetermined positions, effectively preventing the mold components from undergoing micro-yielding or displacement due to the metal liquid pressure during the casting pressure holding process, ensuring the stability of the mold cavity under high pressure, and thus guaranteeing the forming quality of the casting and the safety of the production process.

[0038] 5. Compact structure, reasonable layout, good rigidity and stability. The mold adopts a multi-layer concentric cylinder structure such as an installation base, an inner sleeve, a middle sleeve, and an outer sleeve as the support frame, providing a firm installation reference and accurate guidance for each moving component, ensuring the movement accuracy and overall structural rigidity of the multi-group core molds and outer plates with long strokes under frequent actions, and extending the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of the present invention;

[0040] Figure 2 It is a schematic internal structure diagram of the present invention;

[0041] Figure 3 It is a schematic structural diagram of the middle sleeve;

[0042] Figure 4 It is a schematic structural diagram of the outer adjustment component;

[0043] Figure 5 It is a schematic structural diagram of the combined matching of the inner adjustment component, the jacking component and the driving component;

[0044] Figure 6 It is a schematic structural diagram of the power connection between the adjustment shaft and the outer adjustment component;

[0045] Figure 7 It is a schematic structural diagram of the assembly of the inner adjustment component on the installation base;

[0046] Figure 8 It is a schematic structural diagram of the combined matching of each component of the inner adjustment component;

[0047] Figure 9 It is a schematic structural diagram of the power connection between the long-range assembled inner plate, the short-range assembled inner plate and the adjustment shaft;

[0048] Figure 10 It is a schematic structural diagram of the combined matching of the adjustment shaft with adjusting sleeve A and adjusting sleeve B;

[0049] Figure 11 It is a locus diagram of groove A and groove B;

[0050] Figure 12 It is a schematic structural diagram of the combined matching of the inner adjustment component, the jacking component and the driving component;

[0051] Figure 13 It is a schematic structural diagram of the combined matching of the driving component with the adjustment shaft and the threaded rod;

[0052] Figure 14 It is a sectional schematic diagram of the combined matching of the shunt transmission mechanism;

[0053] Figure 15 for Figure 14 A structural diagram of each component in its disassembled state.

[0054] In the diagram: 11 Long-stroke assembly inner plate, 111 Guide seat A, 112 Guide shaft A, 12 Short-stroke assembly inner plate, 121 Guide seat B, 122 Guide shaft B, 13 Adjusting shaft, 131 Wheel groove A, 1311 Spiral groove A, 1312 Circumferential groove A, 132 Wheel groove B, 1321 Spiral groove B, 1322 Circumferential groove B, 1331 Sun gear, 1332 Planetary gear, 1333 Drive bevel gear, 141 Adjusting sleeve A, 142 Adjusting sleeve B, 143 Connecting rod A, 144 Connecting rod B, 145 Pin A, 146 Pin B, 21 Assembly outer plate, 211 Guide seat C, 212 Rotary joint seat, 22 Upper adjusting screw, 23 Lower adjusting screw, 231 Transmission bevel gear, 24 Transmission shaft, 241 First bevel gear set, 31 Lifting rod, 311 Threaded rod, 32 lifting seat, 41 mounting base, 411 assembly seat, 412 mounting base, 413 mounting pad, 42 inner sleeve, 421 mounting top seat, 422 guide rod, 431 long-stroke guide groove, 432 short-stroke guide groove, 433 guide through groove, 44 middle sleeve, 441 upper ring seat, 442 lower ring seat, 443 operating sleeve, 45 outer sleeve, 46 lower sleeve, 47 mounting bracket, 471 guide sleeve, 5 drive assembly, 51 drive motor, 511 drive shaft, 52 split transmission mechanism, 521 ring electromagnet, 522 driving disc, 523 driven disc, 524 end face gear A, 525 end face gear B, 526 permanent magnet, 527 second bevel gear set, 531 worm A, 532 worm wheel A, 541 worm B, 542 worm wheel B. Detailed Implementation

[0055] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0056] Example 1

[0057] Please see Figure 1 , Figure 2 , Figure 5 , Figures 7-9 A low-pressure casting mold for a gearbox housing, comprising:

[0058] The internal adjustment assembly includes a bottom mold and a core mold assembly mounted on the internal adjustment assembly. The internal adjustment assembly includes multiple sets of long-range assembly inner plates 11 and short-range assembly inner plates 12 arranged in a ring array. The long-range assembly inner plates 11 and short-range assembly inner plates 12 are arranged alternately and both run radially. The radial travel of the long-range assembly inner plate 11 is greater than that of the short-range assembly inner plate 12. Each set of long-range assembly inner plates 11 and short-range assembly inner plates 12 is equipped with a core mold assembly. The bottom mold is located at the bottom of the internal adjustment assembly and arranged around the core mold assembly.

[0059] The external adjustment assembly and the outer mold mounted on the built-in external adjustment assembly. The external adjustment assembly includes multiple sets of assembly outer plates 21 arranged in a ring array. Each set of assembly outer plates 21 runs radially and is arranged on the outside of the internal adjustment assembly. Each set of assembly outer plates 21 is equipped with an outer mold.

[0060] The lifting assembly is located at the axis of the inner adjustment assembly and is used to push the cast gearbox housing upward.

[0061] The core mold assembly mounted on the inner adjustment assembly is used to shape the inner cavity contour of the gearbox housing, while the outer mold mounted on the outer adjustment assembly is used to shape the outer contour of the gearbox housing, and the bottom mold is set at the bottom of the core mold assembly and the outer mold and is used to shape the port contour of the gearbox housing.

[0062] By setting both the core mold assembly and the outer mold as a multi-segment splicing combination structure, it is possible to ensure accurate adaptation of the inner and outer contours of the gearbox housing while facilitating the demolding operation of the core mold assembly and the outer mold.

[0063] Because the inner cavity and outer wall of the gearbox housing usually need to be equipped with various reinforcing ribs, internal oil passages, irregularly shaped mounting holes and other components according to the installation requirements and structural rigidity of components such as gear assemblies, hydraulic torque converters, and clutches.

[0064] By assembling the outer molds onto each assembly outer plate 21 and performing synchronous radial movement, each outer mold can synchronously expand outward to open the mold, thus avoiding spatial movement interference between the outer molds and the external structure of the cast gearbox housing during the mold opening process.

[0065] The core mold assembly is assembled onto each long-stroke assembly inner plate 11 and short-stroke assembly inner plate 12. During the core mold assembly opening stage, the long-stroke assembly inner plate 11 is first controlled to drive the core mold on it to retract inward by a longer stroke, so as to make room for the short-stroke assembly inner plate 12 and the core mold assembled on it to retract. Then, the short-stroke assembly inner plate 12 is controlled to retract inward by a shorter stroke, which enables the core mold assembly to achieve fast and stable opening operation within the limited space inside the gearbox housing.

[0066] After the core mold assembly and outer mold have completed the mold opening operation, the lifting assembly is controlled to lift the cast gearbox housing axially and detach it from the bottom mold, facilitating the subsequent unloading operation of the gearbox housing.

[0067] It should also be noted that the bottom mold, along with each core mold component and the outer mold, form a complete mold cavity structure after being assembled. Continuous pressure is applied to each mold to ensure that the molten metal is cast in a restricted manner using low-pressure casting, so that the molten metal fills all the gaps in the mold cavity structure.

[0068] Each mold is also equipped with a circulation pipeline for heat dissipation or preheating. By circulating heat exchange medium into the pipeline, the mold can be preheated or the shaping speed of the gearbox housing can be effectively increased.

[0069] Example 2

[0070] Please see Figure 2 , Figure 5 , Figure 7 , Figure 8 To ensure that the long-range assembly inner panel 11 and the short-range assembly outer panel 21 can achieve radial telescopic posture adjustment, the following technical solution is provided.

[0071] The internal adjustment assembly also includes an adjustment shaft 13 and adjustment sleeves A141, B142, connecting rod A143, and connecting rod B144 arranged around the adjustment shaft 13 and moving axially. The adjustment shaft 13 has wheel grooves A131 and B132 with non-intersecting trajectories on its outer periphery. The inner side of the adjustment sleeve A141 is fitted with a pin A145 that is matched with the wheel groove A131. The inner side of the adjustment sleeve B142 is fitted with a pin B146 that is matched with the wheel groove B132.

[0072] Both ends of connecting rod A143 are hinged to the long-range assembly inner plate 11 and the adjusting sleeve A141, respectively, and both ends of connecting rod B144 are hinged to the short-range assembly inner plate 12 and the adjusting sleeve B142, respectively.

[0073] When the adjusting shaft 13 is running, its wheel grooves A131 and B132 move synchronously, and then, through the cooperation with pins A145 and B146, drive the adjusting sleeves A141 and B142 to move axially along the adjusting shaft 13. In turn, through connecting rods A143 and B144, the connected long-range assembly inner plate 11 and short-range assembly inner plate 12 move radially.

[0074] Since each long-range assembly inner plate 11 is connected to the adjusting sleeve A141 via a connecting rod A143, the synchronous radial movement of each group of long-range assembly inner plates 11 can be achieved when the adjusting sleeve A141 moves axially. And since each short-range assembly inner plate 12 is connected to the adjusting sleeve B142 via a connecting rod B144, the synchronous radial movement of each group of short-range assembly inner plates 12 can be achieved when the adjusting sleeve B142 moves axially.

[0075] To ensure stable power transmission, multiple sets of axially arranged wheel grooves A131 and B132 can be provided on the adjusting shaft 13, and multiple sets of adjusting sleeves A141 and B142 are also provided accordingly, so as to ensure that the power of the adjusting shaft 13 can be stably transmitted to the adjusting sleeves A141 and B142, and drive the long-range assembly inner plate 11 and the short-range assembly inner plate 12 and the core mold assembly provided thereon to be stably extended and retracted.

[0076] To achieve the sequential extension and retraction of the long-range assembly outer plate 21 and the short-range assembly outer plate 21 in time, so as to enable the core mold assembly to achieve efficient mold opening in a narrow space, the following technical solution is provided.

[0077] Wheel groove A131 includes a spiral groove A1311 and an circumferential groove A1312 connected together. Wheel groove B132 includes a spiral groove B1321 and an circumferential groove B1322 connected together. When pin A145 is in spiral groove A1311, pin B146 is exactly in circumferential groove B1322. When pin A145 is in circumferential groove A1312, pin B146 is exactly in spiral groove B1321.

[0078] Both wheel groove A131 and wheel groove B132 are configured as interconnected spiral grooves and circumferential grooves. When pin A145 engages with spiral groove A1311, the rotating adjusting shaft 13 can drive adjusting sleeve A141 to move axially. At this time, pin B146 engages with circumferential groove B1322. At this time, the rotating adjusting shaft 13 cannot drive adjusting sleeve B142 to move axially. When adjusting shaft 13 continues to run so that pin A145 engages with circumferential groove A1312, pin B146 engages with spiral groove B1321. When adjusting shaft 13 runs, it can drive adjusting sleeve B142 to move axially, while adjusting sleeve A141 does not move axially due to its engagement with circumferential groove A1312.

[0079] The above method can realize the sequential retraction and expansion of the long-range assembly inner plate 11 and the short-range assembly inner plate 12 in terms of timing, thereby avoiding the spatial motion interference of each core mold component caused by synchronous retraction and expansion. Both wheel groove A131 and wheel groove B132 are set as unclosed assembly, that is, the two ends of the wheel groove are not connected to achieve a closed loop. The retraction or expansion posture of each long-range assembly inner plate 11 and short-range assembly inner plate 12 can be realized by controlling the forward and reverse rotation of the adjustment shaft 13.

[0080] Example 3

[0081] Please see Figure 2 , Figure 5 , Figures 7-11 To ensure that all components involved in the internal adjustment assembly can be stably assembled and operate stably in the set manner, the following technical solution is provided.

[0082] It also includes a mounting base 41 and an inner sleeve 42. The mounting base 41 is fixedly connected to a coaxially arranged assembly seat 411 and a mounting base 412. The mounting base 412 is arranged on the outside of the assembly seat 411 and is stepped. The bottom mold is fixedly installed on the assembly seat 411 and arranged on the periphery of the assembly seat 411. The inner sleeve 42 is fixedly installed at the axis of the mounting base 412, and a mounting top seat 421 is fixedly installed at the end of the sleeve.

[0083] The adjusting shaft 13 is arranged at the axis of the inner sleeve 42 and is rotatably connected to the mounting top seat 421 and the mounting base 412. The mounting top seat 421 and the mounting base 412 are both provided with radially distributed long-stroke guide grooves 431 and short-stroke guide grooves 432. Both ends of the long-stroke assembly inner plate 11 are fixedly connected to guide seats A111 that are slidably combined with the long-stroke guide grooves 431. Both ends of the short-stroke assembly inner plate 12 are fixedly connected to guide seats B121 that are slidably combined with the short-stroke guide grooves 432.

[0084] The mounting base 41 provides a stable platform for the installation of various components. The assembly seat 411 on it ensures the stable assembly of the bottom mold and shapes the port part of the gearbox housing. The inner sleeve 42, the mounting top seat 421, and the mounting base 412 ensure the stable installation of various components involved in the internal adjustment assembly.

[0085] The mounting top 421 and mounting base 412 ensure that the adjusting shaft 13 is stably installed in a relative rotational manner, and ensure that the guide seats A111 and B121 matched with the long-range assembly inner plate 11 and the short-range assembly inner plate 12 are stably assembled in a radial sliding manner.

[0086] To ensure that the adjusting sleeves A141 and B142 can operate stably along the axial direction, a guide rod 422 is fixedly connected in the inner sleeve 42. The adjusting sleeves A141 and B142 are slidably installed on the guide rod 422.

[0087] To ensure that the long-range assembly inner plate 11 and the short-range assembly inner plate 12 can be connected to the adjusting shaft 13 in the inner sleeve 42, and to ensure the stable layout of the core mold assembly and to achieve the shaping of the inner cavity of the gearbox housing, the following technical solution is provided.

[0088] Guide shafts A112 and B122 are fixedly connected to the inner walls of the long-range assembly inner plate 11 and the short-range assembly inner plate 12, respectively. Guide shafts A112 and B122 are slidably inserted into the inner sleeve 42. Connecting rods A143 and B144 are hinged to the inner ends of guide shafts A112 and B122, respectively.

[0089] The core mold assembly includes a top core mold and side core molds. The top core mold is fixedly installed on the mounting top seat 421, and the side core molds are fixedly installed on the outer side walls of each long-range assembly inner plate 11 and short-range assembly inner plate 12.

[0090] Guide shafts A112 and B122 can achieve sliding engagement with the inner sleeve 42, further ensuring the stability of the long-range assembly inner plate 11 and the short-range assembly inner plate 12 in radial movement. At the same time, they can achieve hinged connection with the connecting rods A143 and B144 provided inside the inner sleeve 42.

[0091] The top core mold is used to shape the top of the inner cavity of the gearbox housing, while the side core mold is used to shape the side walls of the inner cavity of the gearbox housing. The top core mold and the side core mold are spliced ​​together to form a complete inner cavity outline.

[0092] Example 4

[0093] Please see Figures 1-6 To ensure that each assembly panel 21 in the external adjustment component can be stably assembled and operated, the following technical solution is provided.

[0094] It also includes a middle sleeve 44 and an outer sleeve 45, which are fixedly installed on the mounting base 41 and coaxially arranged. The middle sleeve 44 is arranged on the outside of the mounting base 411, and the mounting outer plate 21 is arranged on the inside of the middle sleeve 44. The ends of the middle sleeve 44 and the mounting base 41 are provided with radially distributed guide grooves 433. Both ends of the mounting outer plate 21 are fixedly connected with guide seats C211 that are slidably combined with the guide grooves 433.

[0095] The external adjustment assembly also includes multiple sets of upper adjustment screws 22, lower adjustment screws 23, and drive shafts 24 arranged in a ring array. A swivel joint seat 212 is fixedly connected to the guide seat C211. The upper adjustment screws 22 and lower adjustment screws 23 are rotatably mounted on the middle sleeve 44 and the mounting base 41, respectively. The swivel joint seats 212 provided at both ends of the outer plate 21 are swivelly connected to the upper adjustment screws 22 and lower adjustment screws 23, respectively. The drive shaft 24 is rotatably mounted to the outside of the middle sleeve 44 and its two ends are poweredly connected to the upper adjustment screws 22 and lower adjustment screws 23, respectively. The lower adjustment screw 23 is poweredly connected to the adjustment shaft 13.

[0096] The guide slot 433 is matched with the guide seat C211 on the outer assembly plate 21 to ensure that the outer assembly plate 21 runs stably in the radial direction. The upper adjusting screw 22 and the lower adjusting screw 23 transmit power through the transmission shaft 24, thereby driving the rotating seats 212 at both ends of the outer assembly plate 21 to run radially, so as to realize the radial transmission operation of the outer assembly plate 21.

[0097] Upper ring seat 441 and lower ring seat 442 are fixedly connected to the outer edges of the two ends of the middle sleeve 44, respectively, to ensure that the two ends of the transmission shaft 24 can be rotatably mounted on the upper ring seat 441 and lower ring seat 442. Both ends of the transmission shaft 24 are connected to the upper adjusting screw 22 and lower adjusting screw 23 through the first bevel gear set 241. That is, matching bevel gears are fixedly connected to the ends of the transmission shaft 24 and the upper adjusting screw 22 and lower adjusting screw 23 to achieve stable power transmission.

[0098] Due to the power transmission characteristics of bevel gears, the upper adjusting screw 22 and the lower adjusting screw 23 will maintain the same speed and reverse rotation. Therefore, by setting the thread grooves on the upper adjusting screw 22 and the lower adjusting screw 23 to opposite positions, the screw seats 212 at both ends and the guide seat C211 can drive the assembly outer plate 21 to achieve stable outward expansion or inward contraction.

[0099] The outer sleeve 45 is arranged outside the middle sleeve 44 to cover the upper adjusting screw 22, the drive shaft 24 and related components, thereby providing effective protection for the external adjusting components.

[0100] An operating sleeve 443 is fixedly connected to the top end of the middle sleeve 44, while an outer sleeve 45 is arranged on the outside of the operating sleeve 443. The operating sleeve 443 is designed to facilitate the low-pressure injection of molten material into the mold cavity, as well as the vacuuming and pressurizing of the mold cavity. It also facilitates the ejection and unloading of the cast gearbox housing from the operating sleeve 443.

[0101] To ensure that the adjusting shaft 13 can drive each set of lower adjusting screws 23 to operate synchronously and stably when it is running, thereby achieving stable power transmission to the external adjusting components, the following technical solution is provided.

[0102] A sun gear 1331 is fixedly connected to the bottom axis of the adjusting shaft 13. Multiple sets of planetary gears 1332 arranged outside the sun gear 1331 are rotatably mounted on the bottom of the mounting base 41. The sun gear 1331 and the planetary gears 1332 are meshed. A drive bevel gear 1333 is fixedly connected to the axis of each set of planetary gears 1332. A transmission bevel gear 231 is fixedly connected to the inner end of the lower adjusting screw 23. The drive bevel gear 1333 and the transmission bevel gear 231 are meshed at the corresponding positions.

[0103] When the adjusting shaft 13 is running, it can drive the sun gear 1331 to run synchronously, which in turn drives each set of planetary gears 1332 and drive bevel gears 1333 to run synchronously. Then, through the combination of drive bevel gears 1333 and transmission bevel gears 231, power is transmitted to each set of lower adjusting screws 23, and the synchronous operation of each set of lower adjusting screws 23 is achieved.

[0104] A mounting pad 413 is detachably mounted on the bottom of the mounting base 41 so that the sun gear 1331 and planet gear 1332 are arranged on the inner side, thereby ensuring that the planet gear 1332 and the drive bevel gear 1333 are stably assembled in a relative rotational posture.

[0105] An outer mold is fixed to the inner wall of the outer assembly plate 21. After the outer mold is assembled, it can shape the outer wall and top of the gearbox housing. The outer assembly plate 21, the side core molds and the outer molds set on the long-range inner assembly plate 11 and the short-range inner assembly plate 12 are all closed or opened in the same process under the adjustment of the adjusting shaft 13 and the lead screw, so as to shorten the efficiency of mold opening and closing.

[0106] Example 5

[0107] Please see Figures 12-13 To ensure that the lifting assembly can be stably assembled and operated at the axial position of the internal adjustment assembly, and to realize the lifting and unloading of the cast gearbox housing, the following technical solution is provided.

[0108] The lifting assembly includes a lifting rod 31 and a lifting seat 32 fixed to the top of the lifting rod 31. The lifting rod 31 is arranged at the axis of the adjusting shaft 13 and extends to the outside of the mounting seat 421. The lifting seat 32 is arranged at the axis of the mounting seat 421.

[0109] The top core mold consists of two parts, an inner and an outer layer, which are spliced ​​together. The outer top core mold is fixedly installed on the mounting top seat 421, while the inner top core mold is fixedly installed on the lifting seat 32. The two parts are spliced ​​together to shape the top of the inner cavity of the gearbox housing.

[0110] When the lifting rod 31 drives the lifting seat 32 and the inner core mold on it to lift upward, the cast gearbox housing can be lifted upward together and unloaded from the top of the operating sleeve 443.

[0111] Example 6

[0112] Please see Figures 12-15 To ensure that the lifting rod 31 in the lifting assembly can achieve stable lifting and lowering movement, to ensure the stable operation of the adjusting shaft 13 in the internal adjusting assembly, and to ensure the stable transmission of power to both, the following technical solutions are provided.

[0113] It also includes a drive assembly 5, which includes a drive motor 51, a flow divider transmission mechanism 52, and a matching combination of worm A531, worm wheel A532, worm B541, and worm wheel B542. The drive motor 51 is connected to the worm A531 and worm B541 through the flow divider transmission mechanism 52. The worm wheel A532 is fixed to the bottom end of the adjusting shaft 13. The bottom end of the lifting rod 31 is coaxially fixed with a threaded rod 311. The axis of the worm wheel B542 is screwed to the threaded rod 311.

[0114] A lower sleeve 46 is also fixed to the bottom of the mounting base 41 to cover the drive assembly 5 and the components of the inner adjustment assembly, outer adjustment assembly, and lifting assembly located below the mounting base 41 for effective protection.

[0115] A mounting bracket 47 is fixedly connected to the bottom of the lower sleeve 46 to ensure that the drive assembly 5, the lifting assembly, and the internal adjustment assembly are stably assembled and operated on it. A guide sleeve 471 is fixedly connected to the mounting bracket 47. A guide groove is provided on the threaded rod 311. The threaded rod 311 passes through the guide sleeve 471 and slides with the guide groove, which can ensure that the threaded rod 311 and the lifting rod 31 rise and fall stably in the vertical direction.

[0116] The power splitting mechanism 52 can receive power from the drive motor 51 and selectively split the power to drive the worm A531 and worm B541 to operate independently. When the worm A531 operates independently, it can drive the worm wheel A532 and the adjusting shaft 13 to operate stably, thereby driving the inner and outer adjusting components to adjust their opening and closing postures. After the mold opening process, the power is transmitted to the worm B541 and drives the worm wheel B542 to operate independently, which can drive the threaded rod 311, the lifting rod 31, and the lifting seat 32 to move upward synchronously, so as to push the cast gearbox housing upward.

[0117] Because the combination of worm gear and worm has the characteristics of speed reduction and torque amplification and one-way self-locking, it can amplify the power and drive the adjusting shaft 13 and threaded rod 311 to run stably. The self-locking effect of the worm on the worm gear can ensure that the worm gear is self-locked when the power is cut off and the worm is stationary, thereby ensuring that the lifting assembly, the inner adjusting assembly, and the outer adjusting assembly are all maintained in the corresponding posture, so as to ensure the stability and accuracy of mold opening, mold closing, and lifting operations.

[0118] To ensure that the power splitting transmission mechanism 52 can stably receive the power from the drive motor 51 and split the power to the worm A531 and worm B541, the following technical solution is provided.

[0119] The diversion transmission mechanism 52 includes an annular electromagnet 521 and a driving disk 522 and a driven disk 523 symmetrically arranged at both ends of the annular electromagnet 521. The output shaft of the drive motor 51 is coaxially fixed to the drive shaft 511. Both sets of driving disks 522 are fixed to the drive shaft 511. An axially running end face gear A524 is installed in the driving disk 522. An end face gear B525 is fixed on the driven disk 523 and is arranged opposite to the end face gear A524. Multiple sets of permanent magnets 526 are fixed on the end face gear A524 and are slidably inserted into the driving disk 522. The two sets of driven disks 523 are dynamically connected to the worm gear A531 and the worm gear B541, respectively.

[0120] The permanent magnets 526 on the two sets of end face gears A524 have a columnar structure and their magnetic poles are symmetrically arranged. By applying current in different directions to the annular electromagnet 521, its magnetic poles can be changed. This drives one set of end face gears to move toward the annular electromagnet 521 via the permanent magnets 526. The corresponding end face gear A524 remains in a non-meshing state with the end face gear B525 on the corresponding follower disk, thus cutting off the power transmission to the driven disk 523. The other set of end face gears moves away from the annular electromagnet 521 via its permanent magnets 526, so that the end face gear A524 meshes with the end face gear B525 on the corresponding follower disk, thereby ensuring that the power on the driving disk 522 can be transmitted to the driven disk 523.

[0121] Driven disc 523 and corresponding worm A531 or worm B541 are connected by a second bevel gear set 527. That is, both driven disc 523 and worm A531 or worm B541 are provided with meshing bevel gears to ensure that the power of driven disc 523 can be stably transmitted to worm A531 or worm B541.

[0122] Through the power diversion transmission mechanism 52, the internal adjustment component, external adjustment component and lifting component can be driven to operate independently, which meets the process requirements of low-pressure casting of the gearbox housing.

[0123] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0124] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low pressure casting mold for a transmission case, characterized by, The application relates to a device for casting a transmission case shell, which comprises the following parts: an inner adjusting assembly and a bottom die and a core die assembly mounted on the inner adjusting assembly, the inner adjusting assembly comprises a plurality of groups of long-range assembly inner plates (11) and short-range assembly inner plates (12) arranged in an annular array, the long-range assembly inner plates (11) and the short-range assembly inner plates (12) are arranged alternately and run along the radial direction, the radial stroke of the long-range assembly inner plates (11) is larger than that of the short-range assembly inner plates (12), the core die assembly is mounted on each group of the long-range assembly inner plates (11) and the short-range assembly inner plates (12), and the bottom die is arranged at the bottom of the inner adjusting assembly and is arranged at the periphery of the core die assembly; an outer adjusting assembly and an outer die mounted on the inner adjusting assembly, the outer adjusting assembly comprises a plurality of groups of assembly outer plates (21) arranged in an annular array, each group of the assembly outer plates (21) runs along the radial direction and is arranged outside the inner adjusting assembly, and the outer die is mounted on each group of the assembly outer plates (21); a jacking assembly arranged at the shaft center of the inner adjusting assembly and used for jacking the transmission case shell upwards; the inner adjusting assembly further comprises an adjusting shaft (13), an adjusting sleeve A (141) and an adjusting sleeve B (142) arranged at the periphery of the adjusting shaft (13) and moving along the axial direction, and a connecting rod A (143) and a connecting rod B (144), the periphery of the adjusting shaft (13) is provided with a wheel groove A (131) and a wheel groove B (132) which do not intersect with each other, the inner side of the adjusting sleeve A (141) is provided with a pin shaft A (145) matched with the wheel groove A (131), and the inner side of the adjusting sleeve B (142) is provided with a pin shaft B (146) matched with the wheel groove B (132); the two ends of the connecting rod A (143) are hingedly connected with the long-range assembly inner plate (11) and the adjusting sleeve A (141) respectively, and the two ends of the connecting rod B (144) are hingedly connected with the short-range assembly inner plate (12) and the adjusting sleeve B (142) respectively; the wheel groove A (131) comprises a spiral groove A (1311) and a ring groove A (1312) arranged in connection, the wheel groove B (132) comprises a spiral groove B (1321) and a ring groove B (1322) arranged in connection, when the pin shaft A (145) runs in the spiral groove A (1311), the pin shaft B (146) runs in the ring groove B (1322) at the same time, and when the pin shaft A (145) runs in the ring groove A (1312), the pin shaft B (146) runs in the spiral groove B (1321) at the same time; and the device further comprises a mounting base (41) and an inner sleeve (42), the mounting base (41) is fixedly connected with an assembly seat (411) and a mounting base (412) arranged in coaxial connection, the mounting base (412) is arranged outside the assembly seat (411) and is arranged in a stepped mode, the bottom die is fixedly mounted on the assembly seat (411) and arranged at the periphery of the assembly seat (411), and the inner sleeve (42) is fixedly mounted on the shaft center of the mounting base (412), and the end of the sleeve is fixedly connected with a mounting top base (421). ​ ​ ​ ​ ​ ​ 2. A low pressure casting mold for a transmission case according to claim 1, characterized in that: ​ The adjusting shaft (13) is arranged at the axis of the inner sleeve (42) and is rotationally connected with the mounting top base (421) and the mounting bottom base (412), the mounting top base (421) and the mounting bottom base (412) are provided with long-range guide grooves (431) and short-range guide grooves (432) distributed in the radial direction, the two ends of the long-range assembly inner plate (11) are fixedly connected with guide seats A (111) in sliding combination with the long-range guide grooves (431), and the two ends of the short-range assembly inner plate (12) are fixedly connected with guide seats B (121) in sliding combination with the short-range guide grooves (432).

3. A low pressure casting mold for a transmission case according to claim 2, characterized in that: The inner side walls of the long-range assembly inner plate (11) and the short-range assembly inner plate (12) are fixedly connected with guide shafts A (112) and guide shafts B (122) respectively, the guide shafts A (112) and the guide shafts B (122) are in sliding insertion with the inner sleeve (42), and the connecting rods A (143) and the connecting rods B (144) are hingedly connected with the inner side ends of the guide shafts A (112) and the guide shafts B (122) respectively. The core mold assembly comprises a top core mold and a side core mold, the top core mold is fixedly installed on the mounting top base (421), and the side core mold is fixedly installed on the outer side walls of each group of long-range assembly inner plates (11) and short-range assembly inner plates (12).

4. A low pressure casting mold for a transmission case according to claim 2, characterized in that: The middle sleeve (44) and the outer sleeve (45) are fixedly installed on the mounting base (41) and are coaxially arranged, the middle sleeve (44) is arranged outside the assembly seat (411), the assembly outer plate (21) is arranged inside the middle sleeve (44), the ends of the middle sleeve (44) and the mounting base (41) are provided with radially distributed guide grooves (433), and the two ends of the assembly outer plate (21) are fixedly connected with guide seats C (211) in sliding combination with the guide grooves (433). The outer adjusting assembly further comprises a plurality of groups of upper adjusting lead screws (22), lower adjusting lead screws (23) and transmission shafts (24) arranged in an annular array, the guide seat C (211) is fixedly connected with a threaded seat (212), the upper adjusting lead screws (22) and the lower adjusting lead screws (23) are rotationally installed on the middle sleeve (44) and the mounting base (41) respectively, the threaded seats (212) provided at the two ends of the assembly outer plate (21) are rotationally connected with the upper adjusting lead screws (22) and the lower adjusting lead screws (23) respectively, the transmission shafts (24) are rotationally installed outside the middle sleeve (44) and are power-connected with the upper adjusting lead screws (22) and the lower adjusting lead screws (23) at the two ends respectively, and the lower adjusting lead screws (23) are power-connected with the adjusting shaft (13).

5. A low pressure casting mold for a transmission case according to claim 4, characterized in that: The bottom shaft of the adjusting shaft (13) is fixedly connected with a sun gear (1331), a plurality of groups of planetary gears (1332) arranged outside the sun gear (1331) are rotatably arranged on the bottom of the mounting base (41), the sun gear (1331) is in engagement with the planetary gears (1332), the shaft of each group of planetary gears (1332) is fixedly connected with a driving bevel gear (1333), the inner side end of the lower adjusting lead screw (23) is fixedly connected with a transmission bevel gear (231), and the driving bevel gear (1333) at the corresponding position is in engagement with the transmission bevel gear (231).

6. A low pressure casting mold for a transmission case according to claim 2, characterized in that: The jacking assembly comprises a jacking rod (31) and a jacking seat (32) fixed to the top end of the jacking rod (31), the jacking rod (31) is arranged at the shaft of the adjusting shaft (13) and extends to the outside of the mounting top seat (421), and the jacking seat (32) is arranged at the shaft of the mounting top seat (421).

7. A low pressure casting mold for a transmission case according to claim 6, characterized in that: The driving assembly (5) comprises a driving motor (51), a shunt transmission mechanism (52), and a matched combination of a worm A (531), a worm wheel A (532) and a worm B (541), and a worm wheel B (542), the driving motor (51) is in power connection with the worm A (531) and the worm B (541) through the shunt transmission mechanism (52), the worm wheel A (532) is fixed to the bottom end of the adjusting shaft (13), the bottom end of the jacking rod (31) is coaxially fixedly connected with a threaded rod (311), and the shaft of the worm wheel B (542) is in rotation connection with the threaded rod (311).

8. A low pressure casting mold for a transmission case according to claim 7, characterized in that: The shunt transmission mechanism (52) comprises a ring-shaped electromagnet (521), a driving disc (522) and a driven disc (523) symmetrically arranged at both ends of the ring-shaped electromagnet (521), the output shaft of the driving motor (51) is coaxially fixedly connected with a driving shaft (511), two groups of driving discs (522) are fixedly connected to the driving shaft (511), an end face gear A (524) running in the axial direction is arranged in the driving disc (522), an end face gear B (525) in opposite arrangement with the end face gear A (524) is fixedly connected to the driven disc (523), a plurality of groups of permanent magnets (526) in sliding insertion with the driving disc (522) are fixedly connected to the end face gear A (524), and two groups of driven discs (523) are in driving connection with the worm A (531) and the worm B (541) respectively.

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