Gear machining tool

Abstract

The invention provides a gear machining tool, which is used for machining a gear, and comprises a mandrel, a first rotating shaft, a second rotating shaft, a third rotating shaft, a fourth rotating shaft and a fourth rotating shaft, at least part of the oil liquid flowing part is arranged on the surface of the mandrel and is opposite to the hole wall surface of the inner hole, the oil liquid flowing part is used for flowing pressure oil, and pressure is applied to the hole wall surface through the pressure oil, so that the mandrel is separated from the inner hole under the interaction force between the pressure oil and the hole wall surface. By means of the technical scheme, the risk that an inner hole of the gear is scratched in the core shaft dismounting process is avoided, so that the gear machining precision and quality are improved, and the problems that in the prior art, in the core shaft dismounting process after gear grinding machining, the wall face of the inner hole of the gear is prone to being damaged, and the assembly precision of the gear and a motor shaft is reduced are solved.

Description

Technical Field

[0001] This invention relates to the field of gear processing, and more specifically, to a gear processing fixture. Background Technology

[0002] As an indispensable transmission component in equipment, the machining accuracy of gears has a decisive impact on the performance of the entire system. Gear machining typically includes steps such as gear blank machining, gear tooth profile machining, heat treatment, and finish machining. Among these, the gear grinding process in the finish machining stage is crucial for improving the accuracy and performance of gears.

[0003] To simulate the on-vehicle loading condition, current gear grinding processes typically involve designing a mandrel that fits into the gear's inner bore. During the gear grinding process, the gear is inserted into the mandrel, and the mandrel is press-fitted according to the actual loading amount under the on-vehicle loading condition. After press-fitting, the mandrel and gear are integrated for gear grinding and inspection.

[0004] However, after traditional gear grinding, the mandrel is usually heated or struck during disassembly. These methods may cause scratches, deformation or other damage to the inner hole of the gear during disassembly, resulting in a reduction in the assembly accuracy between the gear and the motor shaft. Summary of the Invention

[0005] The main objective of this invention is to provide a gear machining fixture to solve the problem in the prior art that the inner wall of the gear is easily damaged during the disassembly of the mandrel after gear grinding, which reduces the assembly accuracy with the motor shaft.

[0006] To achieve the above objectives, according to one aspect of the present invention, a gear machining fixture is provided for machining gears. The gear machining fixture includes: a mandrel, which passes through the inner hole of the gear; and an oil flow section, at least a portion of which is disposed on the surface of the mandrel and opposite to the wall surface of the inner hole. The oil flow section is used to flow pressurized oil, which applies pressure to the wall surface of the hole, so that the mandrel is disengaged from the inner hole under the interaction force between the pressurized oil and the wall surface of the hole.

[0007] Furthermore, the oil flow section includes: a first flow section disposed on the surface of the mandrel and recessed toward the interior of the mandrel; the first flow section is disposed opposite to the wall surface of the inner hole; and the first flow section extends along the circumferential direction or the length direction of the mandrel.

[0008] Furthermore, there are multiple first flow sections, which are spaced apart along the circumferential direction of the mandrel, and each first flow section extends along the circumferential direction of the mandrel; or, the first flow section extends along the axial direction of the mandrel in a spiral trajectory.

[0009] Furthermore, the first flow section extends along the length direction of the mandrel, and there are multiple first flow sections, which are spaced apart along the circumferential direction of the mandrel.

[0010] Furthermore, the oil circulation section also includes a second circulation section, which is disposed on the spindle. The second circulation section is connected to the first circulation section, and pressurized oil is supplied to the first circulation section through the second circulation section.

[0011] Furthermore, a second flow section is disposed inside the mandrel, and the second flow section extends along the axial direction of the mandrel. The oil flow section also includes:

[0012] A connecting oil passage is provided inside the mandrel. The two ends of the connecting oil passage are connected to the first flow section and the second flow section, respectively. The pressurized oil in the second flow section flows into the first flow section through the connecting oil passage.

[0013] Furthermore, the first flow section is an oil passage groove that extends along the circumferential direction of the mandrel;

[0014] The second circulation section is an oil injection channel, with the bottom end of the oil injection channel located below the oil trough.

[0015] Furthermore, the mandrel includes a first shaft end and a second shaft end arranged opposite each other along the axial direction, and the outer diameter of the mandrel gradually increases along the direction from the first shaft end to the second shaft end;

[0016] The oil circulation section includes:

[0017] The first flow section is disposed on the surface of the mandrel and recessed toward the mandrel portion, and the first flow section is disposed opposite to the hole wall surface;

[0018] The second circulation section is located at the end of the first shaft. The second circulation section is connected to the first circulation section and pressurized oil is supplied into the first circulation section through the second circulation section.

[0019] Furthermore, the gear processing fixture also includes: a frame assembly, which includes: a base; a support member mounted on the base; a first plate detachably connected to the support member; and a second plate disposed on the support member, spaced apart from the first plate along the height direction of the support member. A receiving space for accommodating the gear is provided between the first plate and the second plate. The two end faces of the gear are respectively in contact with the first plate and the second plate to limit the gear during the process of mandrel disengagement. The first plate has a through hole, and the end of the mandrel passes through the first through hole and is clearance-fitted with the first through hole.

[0020] Furthermore, the spindle is provided with a mating step, and the frame assembly also includes a first pressing groove, which is provided on the first mating surface of the first plate, the first pressing groove surrounds the first through hole, and at least a portion of the step end face of the mating step is in contact with the groove wall surface of the first pressing groove; and a second pressing groove, which is provided on the first mating surface of the first plate, the second pressing groove surrounds the first pressing groove, and at least a portion of the end face of the gear is in contact with the groove wall surface of the second pressing groove.

[0021] By applying the technical solution of this invention, a mandrel is inserted into the inner hole of a gear, and an oil flow section is provided on the surface of the mandrel. This oil flow section is opposite to the wall surface of the inner hole and is used for the flow of pressurized oil. When it is necessary to remove the mandrel from the inner hole, the pressurized oil flows in the oil flow section, directly applying pressure to the wall surface of the inner hole. During this process, the mandrel and the wall surface of the inner hole are subjected to the expansion effect of the pressurized oil. Through the interaction force between the pressurized oil and the wall surface of the inner hole, the mandrel is driven to move within the inner hole, causing the mandrel to disengage from the gear. This effectively reduces the frictional resistance between the mandrel and the inner hole, allowing the mandrel to be smoothly and without damage detached from the inner hole under the action of pressurized oil. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 A three-dimensional structural schematic diagram of the frame assembly of the gear machining tooling according to the present invention is shown;

[0024] Figure 2 A cross-sectional view of the gear machining fixture according to the present invention is shown;

[0025] Figure 3 A schematic diagram of the mandrel structure of the gear machining fixture according to the present invention is shown;

[0026] Figure 4 A schematic diagram of the mandrel and gear assembly of the gear machining fixture according to the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 100. Gear; 110. Inner hole;

[0029] 200, mandrel; 210, first shaft end; 211, first lifting hole; 220, second shaft end; 221, second lifting hole; 230, mating step;

[0030] 300. Oil flow section; 310. First flow section; 311. Oil trough; 320. Second flow section; 321. Oil injection channel; 330. Connecting oil passage;

[0031] 400, Frame assembly; 410, Base; 420, Support member; 421, First nut; 422, Second nut; 430, First plate; 431, First through hole; 432, First press-in groove; 433, Second press-in groove; 434, First mating surface; 440, Second plate; 441, Second through hole; 450, Accommodation space. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] As mentioned in the background section, current gear grinding processes, in order to simulate the on-vehicle mounting condition, typically involve designing a mandrel that mates with the gear's inner bore. During the gear grinding process, the gear is inserted into the mandrel, and the mandrel is press-fitted according to the actual on-vehicle mounting amount. After press-fitting, the mandrel and gear become a single unit for gear grinding and inspection. However, in traditional gear grinding processes, the mandrel is usually disassembled by heating or hammering. These methods may cause scratches, deformation, or other damage to the gear's inner bore during disassembly, leading to a compromise in the fit between the gear and the motor shaft. Therefore, in view of the above-mentioned technical problems, this application provides a gear processing fixture for processing a gear 100. The gear processing fixture includes: a mandrel 200, which passes through the inner hole 110 of the gear 100; and an oil flow section 300, at least a portion of which is disposed on the surface of the mandrel 200 and is disposed opposite to the hole wall of the inner hole 110. The oil flow section 300 is used to flow pressurized oil, and the pressurized oil applies pressure to the hole wall so that the mandrel 200 is disengaged from the inner hole 110 under the interaction force between the pressurized oil and the hole wall. By employing the structure of the oil flow section 300, pressurized oil can be introduced between the inner hole 110 and the mandrel 200, generating an interaction force between them. As the pressure of the pressurized oil gradually increases, the reaction force on the mandrel 200 also gradually increases until the mandrel 200 is squeezed out of the inner hole 110. At the same time, the lubrication effect of the pressurized oil avoids the risk of scratching the inner hole 110 of the gear 100 during the disassembly of the mandrel 200, thereby improving the machining accuracy and quality of the gear 100 and solving the technical problem in the prior art that the mandrel 200 is difficult to disassemble without damage after gear grinding.

[0034] Please refer to Figures 1 to 4As shown, this application provides a gear machining fixture for machining a gear 100. The gear machining fixture includes: a mandrel 200, which passes through the inner hole 110 of the gear 100; and an oil flow section 300, at least a portion of which is disposed on the surface of the mandrel 200 and is disposed opposite to the hole wall of the inner hole 110. The oil flow section 300 is used to flow pressurized oil, which applies pressure to the hole wall so that the mandrel 200 is disengaged from the inner hole 110 under the interaction force between the pressurized oil and the hole wall.

[0035] In this way, by inserting the mandrel 200 into the inner hole 110 of the gear 100, and providing an oil flow section 300 on the surface of the mandrel 200, which faces the bore wall of the inner hole 110, pressure oil is allowed to flow through it. When it is necessary to remove the mandrel 200 from the inner hole 110, the pressure oil flows through the oil flow section 300, directly applying pressure to the bore wall of the inner hole 110. During this process, the mandrel 200 and the bore wall of the inner hole 110 are subjected to the expansion effect of the pressure oil. Through the interaction force between the pressure oil and the bore wall of the inner hole 110, the mandrel 200 is driven to move within the inner hole 110, causing the mandrel 200 to disengage from the gear 100. This effectively reduces the frictional resistance between the mandrel 200 and the inner hole 110, allowing the mandrel 200 to smoothly and without damage detach from the inner hole 110 under the action of the pressure oil.

[0036] In use, the mandrel 200 is first inserted into the inner hole 110 of the gear 100 to ensure smooth gear grinding of the gear 100 under simulated vehicle mounting conditions. After the gear grinding is completed, the mandrel 200 is disassembled from the gear 100. The operator uses a manual hydraulic pump assembly to inject pressurized oil into the oil flow section 300. The pressurized oil flows between the mandrel 200 and the hole wall of the gear 100, applying force to the mandrel 200 and the hole wall of the inner hole 110, driving the mandrel 200 to move within the inner hole 110, thus disengaging the mandrel 200 from the gear 100 and effectively reducing the frictional resistance between the mandrel 200 and the hole wall of the gear 100. In this way, the mandrel 200 can be smoothly disengaged from the inner hole 110 of the gear 100 without damage, avoiding the risk of scratching the inner hole 110 of the gear 100 that may be caused by traditional disassembly methods. This process not only simplifies the disassembly steps of the mandrel 200 and improves work efficiency, but also ensures the integrity of the inner hole 110 of the gear 100, which helps to improve the accuracy of subsequent processing and assembly and reduces quality problems caused by damage to the inner hole 110.

[0037] The pressure oil is either lubricating oil or hydraulic oil.

[0038] like Figure 2 and Figure 3As shown, the oil flow section 300 includes a first flow section 310, which is disposed on the surface of the spindle 200 and recessed toward the interior of the spindle 200. The first flow section 310 is disposed opposite to the wall surface of the inner hole 110, and the first flow section 310 extends along the circumferential direction or the length direction of the spindle 200.

[0039] In this embodiment, this structure ensures that the pressurized oil is evenly distributed on the contact surface of the mandrel 200 and the inner hole 110 of the gear 100 during disassembly. The pressure difference generated by high-pressure oil injection overcomes the friction and interference fit between the mandrel 200 and the inner hole 110, thereby achieving smooth disassembly of the mandrel 200 while ensuring that the surface of the inner hole 110 is undamaged, meeting the process requirements for subsequent use. The introduction of the first flow section 310 not only simplifies oil management during disassembly but also improves disassembly efficiency and the protection effect of the inner hole 110.

[0040] like Figure 2 and Figure 3 As shown, there are multiple first flow portions 310, which are spaced apart along the circumferential direction of the spindle 200, and each first flow portion 310 extends along the circumferential direction of the spindle 200; or, the first flow portions 310 extend along a spiral trajectory along the axial direction of the spindle 200. In the first embodiment of this application, there are multiple first flow portions 310, which are spaced apart along the circumferential direction of the spindle 200, and each first flow portion extends along the circumferential direction of the spindle 200.

[0041] This ensures that during the pressing and disassembly of the mandrel 200, the lubricating oil or hydraulic oil can be evenly distributed and flow smoothly between the mandrel 200 and the inner hole 110 of the gear 100. Whether in the process of heating assembly or high-pressure oil injection disassembly, it can effectively reduce damage caused by local overpressure or poor lubrication, and improve the fitting accuracy and service life of the mandrel 200 and the gear 100.

[0042] In a second embodiment of this application, the first flow section 310 extends along the axial direction of the mandrel 200 in a spiral trajectory.

[0043] The flow path of the oil is extended through the spiral trajectory, which further promotes the lubrication effect and ensures the gentle separation of the mandrel 200 from the gear inner hole 110 during disassembly. This avoids the problem of scratches or deformation of the inner hole 110 that may be caused by direct forceful disassembly, thereby maintaining the geometric accuracy and surface quality of the gear 100 inner hole 110 and meeting the customer's requirements for simulating the actual application state of the gear forming process.

[0044] In the third embodiment of this application, the first flow portion 310 extends along the length direction of the mandrel 200, and there are multiple first flow portions 310, which are spaced apart along the circumferential direction of the mandrel 200.

[0045] In this embodiment, the mandrel 200 is provided with a first flow portion 310 extending along its length direction, and multiple first flow portions 310 are provided, which are spaced apart along the circumferential direction of the mandrel 200. This structure of the mandrel 200 can provide multiple lubrication and pressure release paths during gear grinding and disassembly, ensuring uniform contact and smooth separation between the gear 100 and the mandrel 200.

[0046] By providing multiple first flow sections 310 in the circumferential direction of the mandrel 200, all-round lubrication of the inner hole 110 of the gear 100 can be achieved. Thus, when the mandrel 200 is disassembled by high-pressure oil injection after machining, the disassembly force can be effectively reduced, damage to the inner hole 110 of the gear 100 can be avoided, and the subsequent assembly accuracy can be guaranteed.

[0047] like Figure 2 and Figure 3 As shown, the oil circulation section 300 further includes a second circulation section 320, which is disposed on the spindle 200. The second circulation section 320 is connected to the first circulation section 310, and pressurized oil is supplied to the first circulation section 310 through the second circulation section 320.

[0048] In this embodiment, the oil flow section 300 further includes a second flow section 320, which is disposed on the spindle 200 and communicates with the first flow section 310. Pressurized oil is supplied to the first flow section 310 through the second flow section 320. This optimizes the disassembly process of the spindle 200. By precisely injecting high-pressure oil, lubrication and pressure balance between the spindle 200 and the inner bore 110 of the gear 100 are achieved, thereby reducing the risk of damage to the inner bore 110 during disassembly.

[0049] The pressure oil is guided from the second flow section 320 to the first flow section 310, ensuring that the pressure oil is evenly distributed on the contact surface between the spindle 200 and the gear 100. This effectively reduces friction, allowing the spindle 200 to be smoothly and safely disengaged from the gear 100, while maintaining the integrity of the inner hole 110 and avoiding potential quality problems during subsequent use.

[0050] like Figure 2 and Figure 3 As shown, the second flow section 320 is disposed inside the spindle 200 and extends along the axial direction of the spindle 200. The oil flow section 300 also includes a connecting oil passage 330 disposed inside the spindle 200. The two ends of the connecting oil passage 330 are respectively connected to the first flow section 310 and the second flow section 320. The pressurized oil in the second flow section 320 flows into the first flow section 310 through the connecting oil passage 330.

[0051] In this embodiment, the second flow section 320 is disposed inside the mandrel 200. Oil communication between the first flow section 310 and the second flow section 320 is achieved through the connecting oil passage 330, allowing pressurized oil in the second flow section 320 to flow smoothly into the first flow section 310, ensuring uniform oil pressure distribution and efficient transmission during disassembly. After oil accumulates in the second flow section 320, it is released to the first flow section 310 via the connecting oil passage 330, thereby forming a uniform pressure field throughout the mandrel 200. This effectively promotes the safe separation of the mandrel 200 and the gear 100, avoiding unnecessary damage to the inner bore 110 during disassembly, while also ensuring disassembly efficiency and ease of operation.

[0052] like Figure 2 and Figure 3 As shown, the first circulation section 310 is an oil groove 311, which extends along the circumferential direction of the spindle 200; the second circulation section 320 is an oil injection channel 321, with the bottom end of the oil injection channel 321 located below the oil groove 311.

[0053] In this embodiment, the oil groove 311 extends along the circumferential direction of the mandrel 200, providing a uniformly distributed lubrication path for high-pressure oil injection during the disassembly process of the mandrel 200. This ensures smooth separation between the mandrel 200 and the inner hole 110 of the gear 100, while avoiding the possibility of damage to the inner hole 110 due to local overpressure. The bottom end of the oil injection channel 321 is located below the oil groove 311. Pressurized oil reaches the bottom end of the oil injection channel 321 along the oil injection channel 321, causing the pressurized oil to flow in the opposite direction, thereby forming a countercurrent. This provides a buffering effect for the pressurized oil injected from the oil injection channel 321, increasing the smoothness of oil injection.

[0054] Furthermore, multiple oil injection channels 321 are provided, spaced apart along the circumferential direction of the mandrel 200. This allows multiple oil injection channels 321 to simultaneously inject pressurized oil, accelerating the penetration speed of the pressurized oil, shortening the disassembly time, and improving work efficiency. In addition, multiple oil injection channels 321 help distribute the pressurized oil more evenly across the entire contact surface, ensuring uniform application of disassembly force, reducing localized stress concentration, and preventing damage to the workpiece or mandrel 200.

[0055] like Figure 2 and Figure 3As shown, the mandrel 200 includes a first shaft end 210 and a second shaft end 220 disposed opposite to each other along the axial direction. The outer diameter of the mandrel 200 gradually increases along the direction from the first shaft end 210 to the second shaft end 220. The oil flow section 300 includes: a first flow section 310 disposed on the surface of the mandrel 200 and recessed toward the interior of the mandrel 200, the first flow section 310 being disposed opposite to the bore wall; and a second flow section 320 disposed on the first shaft end 210, the second flow section 320 communicating with the first flow section 310, through which pressurized oil is supplied to the first flow section 310.

[0056] In this embodiment, the outer diameter of the mandrel 200 gradually increases from the first shaft end 210 to the second shaft end 220, which is beneficial for accurately controlling the pressing amount during the press-fitting process and ensuring the accuracy and stability of gear grinding under simulated actual vehicle loading conditions. During the process of injecting pressurized oil to disengage the mandrel 200 from the gear 100, the tapered mating surface allows the mandrel 200 to easily disengage from the inner hole 110. The oil circulation section 300 includes: a first circulation section 310, which is disposed on the surface of the spindle 200 and recessed towards the interior of the spindle 200, and is disposed opposite to the bore wall; and a second circulation section 320, which is disposed on the first shaft end 210 and communicates with the first circulation section 310. High-pressure oil is injected through the second circulation section 320 and can diffuse along the first circulation section 310, thereby reducing the friction between the spindle 200 and the gear 100, thus achieving efficient disassembly of the spindle 200, while ensuring the integrity of the inner bore 110 of the gear 100 and avoiding wear and damage during processing or disassembly.

[0057] Furthermore, such as Figure 2 and Figure 3 As shown, the first shaft end 210 is provided with a first lifting hole 211, which is located on the axis of the first shaft end 210, to facilitate the lifting of the mandrel 200. The second shaft end 220 is provided with a second lifting hole 221, which is located on the axis of the second shaft end 220, to facilitate the lifting of the mandrel 200.

[0058] Furthermore, the mandrel 200 is located within the inner hole 110 of the gear 100, and the mandrel 200 abuts against the gear 100. As a support member, the mandrel 200 ensures the accurate position and stability of the gear 100 during machining, preventing positional displacement due to the weight of the gear 100 itself or cutting forces during machining. The abutment between the mandrel 200 and the gear 100 also provides additional support, preventing deformation of the gear 100 during machining.

[0059] Furthermore, both the first shaft end 210 and the second shaft end 220 are provided with alignment belts in the circumferential direction, which are used to position and calibrate during the gear grinding process to ensure machining accuracy and gear quality.

[0060] In other embodiments, the mandrel 200 includes a first shaft end 210 and a second shaft end 220 disposed opposite each other along the axial direction, and the outer diameter of the mandrel 200 remains unchanged along the direction from the first shaft end 210 to the second shaft end 220;

[0061] like Figure 1 , Figure 2 and Figure 3 As shown, the gear processing fixture also includes: a frame assembly 400, which includes: a base 410; a support member 420 mounted on the base 410; a first plate 430 detachably connected to the support member 420; and a second plate 440 disposed on the support member 420 and spaced apart from the first plate 430 along the height direction of the support member 420. A receiving space 450 for accommodating the gear 100 is provided between the first plate 430 and the second plate 440. The two end faces of the gear 100 are respectively in contact with the first plate 430 and the second plate 440 to limit the gear 100 during the process of the mandrel 200 disengaging. The first plate 430 is provided with a through hole 431, and the end of the mandrel 200 passes through the first through hole 431 and is clearance-fitted with the first through hole 431.

[0062] In this embodiment, the frame assembly 400 includes a base 410, a support member 420, a first plate 430, and a second plate 440, which together constitute a device for disassembling the mandrel 200. The base 410 provides a stable foundation for the entire tooling, and the support member 420 is mounted on the base 410 to support the first plate 430 and the second plate 440. The first plate 430 is detachably connected to the support member 420, while the second plate 440 is disposed on the support member 420 and spaced a certain distance from the first plate 430 along the height direction of the support member 420, forming a receiving space 450 for placing the gear 100. After the gear grinding is completed, during the disassembly of the mandrel 200, the first plate 430 and the second plate 440 limit the gear 100 by fitting the two end faces of the gear 100, ensuring that the gear 100 remains stable when the mandrel 200 is removed. This avoids displacement or damage to the gear 100 that may occur due to the removal of the mandrel 200, thereby ensuring that the inner hole 110 of the gear 100 remains undamaged after the mandrel 200 is removed, meeting the requirements for subsequent assembly and use.

[0063] Furthermore, the second plate 440 is provided with a through second hole 441, and the spindle 200 passes through the second hole 441 during the process of disengaging from the gear 100.

[0064] Furthermore, such as Figure 1As shown, the support member 420 is a column with threads on its outer periphery. The frame assembly 400 also includes multiple first nuts 421 and multiple second nuts 422. The first nuts 421 are threaded to the column. The first plate 430 and the second plate 440 are both inserted through the column. The multiple first nuts 421 are located above the first plate 430, and the multiple second nuts 422 are located below the second plate 440. By screwing the first nuts 421 and the second nuts 422, the first plate 430 and the second plate 440 are driven to clamp the gear 100, thereby limiting the position of the gear 100.

[0065] like Figure 2 and Figure 4 As shown, the spindle 200 is provided with a mating step 230, and the frame assembly 400 also includes a first pressing groove 432, which is provided on the first mating surface 434 of the first plate 430. The first pressing groove 432 is provided around the first through hole 431, and at least a portion of the step end face of the mating step 230 is in contact with the groove wall surface of the first pressing groove 432; a second pressing groove 433 is provided on the first mating surface 434 of the first plate 430, and the second pressing groove 433 is provided around the first pressing groove 432. At least a portion of the end face of the gear 100 is in contact with the groove wall surface of the second pressing groove 433.

[0066] In this embodiment, the first plate 430 is provided with a first pressing groove 432 and a second pressing groove 433, both located on the upper surface and arranged around the first through hole 431. The first pressing groove 432 directly surrounds the first through hole 431, while the second pressing groove 433 surrounds the first pressing groove 432. This double-groove structure provides precise pressing amount control when the mandrel 200 is pressed into the inner hole 110 of the gear 100, ensuring more accurate gear grinding under simulated vehicle loading conditions. Through the structure of the first pressing groove 432 and the second pressing groove 433, the device can effectively control the pressing depth of the mandrel 200, avoiding damage to the gear 100 or the mandrel 200 due to improper pressing amount, while ensuring the consistency and stability of gear grinding under simulated actual application conditions. In the subsequent disassembly process, this design also helps to ensure that the mandrel 200 is smoothly removed from the inner hole 110, reducing the potential impact of disassembly operations on the inner hole 110, thereby maintaining the integrity and accuracy of the inner hole 110 after processing.

[0067] When assembling the mandrel 200 and gear 100, the gear 100 is heated using an electromagnetic induction heater. A temperature sensor is used to measure the temperature near the inner hole 110 until it reaches 120±5℃. This temperature is maintained for 10 minutes, and the tooth surface temperature must not exceed 120℃. The heated gear 100 is then placed on the first plate 430 with the second shaft end 220 facing upwards, ensuring a close fit between the gear 100 and the gear machining fixture. Lubricating oil is then evenly applied to the outer circumference of the mandrel 200. The first shaft end 210 of the mandrel 200 is placed downwards into the inner hole 110 of the heated gear 100. The end of the second shaft end 220 is tapped with a nylon hammer to ensure the mandrel 200 extends into the appropriate position within the inner hole 110 of the gear 100. After the gear 100 returns to normal temperature, the depth of the mandrel 200's insertion into the gear 100 is re-measured using a depth gauge, and then gear grinding is performed.

[0068] After the gear grinding is completed, when disassembling the mandrel 200 from the gear 100, place the ground gear 100 onto the second plate 440, install the first plate 430 onto the gear 100, and press the gear 100 firmly. Install a conversion joint and a manual hydraulic pump assembly in the oil injection channel 321 of the mandrel 200, and pressurize the manual hydraulic pump to inject oil into the mandrel 200 until the mandrel 200 is dislodged. After confirming that the mandrel 200 is dislodged, confirm that the pressure of the hydraulic pump for injecting oil into the mandrel 200 is zero. If it is not zero, manually release the pressure, disassemble the conversion joint, remove the first nut 421 on the column, and remove the first plate 430. Then remove the gear 100 and check whether there are scratches on the inner hole 110.

[0069] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0070] By inserting a mandrel 200 into the inner bore 110 of the gear 100, and providing an oil flow section 300 on the surface of the mandrel 200, which faces the bore wall of the inner bore 110, pressure oil is allowed to flow through it. When it is necessary to remove the mandrel 200 from the inner bore 110, pressure oil flows through the oil flow section 300, directly applying pressure to the bore wall of the inner bore 110. During this process, the mandrel 200 and the bore wall of the inner bore 110 are subjected to the expansion effect of the pressure oil. Through the interaction force between the pressure oil and the bore wall of the inner bore 110, the mandrel 200 is driven to move within the inner bore 110, causing the mandrel 200 to disengage from the gear 100. This effectively reduces the frictional resistance between the mandrel 200 and the inner bore 110, allowing the mandrel 200 to smoothly and without damage detach from the inner bore 110 under the action of pressure oil.

[0071] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0072] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0073] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0074] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gear machining tooling for machining a gear (100), characterized by, The gear machining tool includes: a mandrel (200) arranged in the inner hole (110) of the gear (100); an oil flow passage (300) arranged on the surface of the mandrel (200) and opposite to the hole wall surface of the inner hole (110), the oil flow passage (300) being used for flowing pressure oil, the pressure oil being used for applying pressure to the hole wall surface so that the mandrel (200) is separated from the inner hole (110) under the interaction force between the pressure oil and the hole wall surface.

2. The gear machining tooling fixture of claim 1, wherein, The oil flow passage (300) includes: a first flow passage (310) arranged on the surface of the mandrel (200) and recessed towards the inside of the mandrel (200), the first flow passage (310) being arranged opposite to the hole wall surface of the inner hole (110), the first flow passage (310) extending along the circumferential direction of the mandrel (200) or extending along the length direction.

3. The gear machining tooling fixture of claim 2, wherein, The first flow passage (310) is a plurality of first flow passages (310) arranged at intervals along the circumferential direction of the mandrel (200), and each first flow passage (310) extends along the circumferential direction of the mandrel (200); or The first flow passage (310) extends along the axial direction of the mandrel (200) in a spiral trajectory.

4. The gear machining tooling fixture of claim 2, wherein, The first flow passage (310) extends along the length direction of the mandrel (200), and the first flow passage (310) is a plurality of first flow passages (310) arranged at intervals along the circumferential direction of the mandrel (200).

5. The gear machining tooling fixture of claim 2, wherein, The oil flow passage (300) further includes: a second flow passage (320) arranged on the mandrel (200), the second flow passage (320) being communicated with the first flow passage (310), and the pressure oil being supplied into the first flow passage (310) through the second flow passage (320).

6. The gear machining tooling fixture of claim 5, wherein, The second flow passage (320) is arranged inside the mandrel (200), and the second flow passage (320) extends along the axial direction of the mandrel (200), and the oil flow passage (300) further includes: a communication oil channel (330) arranged in the mandrel (200), two ends of the communication oil channel (330) being communicated with the first flow passage (310) and the second flow passage (320) respectively, and the pressure oil in the second flow passage (320) flowing into the first flow passage (310) through the communication oil channel (330).

7. The gear machining tooling fixture of claim 5, wherein, The first flow passage (310) is an oil passing groove (311) extending along the circumferential direction of the mandrel (200); The second flow passage (320) is an oil injection channel (321), and the bottom end of the oil injection channel (321) is located below the oil passing groove (311).

8. The gear machining tooling fixture of claim 1, wherein, The mandrel (200) includes a first shaft end (210) and a second shaft end (220) arranged opposite along the axial direction, and the outer diameter of the mandrel (200) gradually increases in the direction from the first shaft end (210) to the second shaft end (220). The oil flow passage (300) comprises: A first flow passage (310) is arranged on the surface of the mandrel (200) and recessed towards the inside of the mandrel (200), and the first flow passage (310) is arranged opposite to the hole wall surface; A second flow passage (320) is arranged on the first shaft end (210), and the second flow passage (320) is in communication with the first flow passage (310), and the second flow passage (320) is used to supply pressure oil into the first flow passage (310).

9. The gear machining tooling fixture of claim 1, wherein, The gear machining tool further comprises a frame assembly (400), and the frame assembly (400) comprises: A base (410); A support (420) is installed on the base (410); A first plate body (430) is detachably connected with the support (420); A second plate body (440) is arranged on the support (420) and is spaced apart from the first plate body (430) along the height direction of the support (420), and a containing space (450) for containing the gear (100) is arranged between the first plate body (430) and the second plate body (440), and the two end surfaces of the gear (100) are respectively attached to the first plate body (430) and the second plate body (440) to limit the gear (100) during the disengagement of the mandrel (200); A first through hole (431) is provided on the first plate body (430), and the end portion of the mandrel (200) is arranged in the first through hole (431) and is in clearance fit with the first through hole (431).

10. The gear machining tooling fixture of claim 9, wherein, The mandrel (200) is provided with a matching step (230), and the frame assembly (400) further comprises, A first pressing groove (432) is arranged on the first attachment surface (434) of the first plate body (430), the first pressing groove (432) surrounds the first through hole (431), and at least part of the step end surface of the matching step (230) is attached to the groove wall surface of the first pressing groove (432); A second pressing groove (433) is arranged on the first attachment surface (434) of the first plate body (430), the second pressing groove (433) surrounds the first pressing groove (432), and at least part of the end surface of the gear (100) is attached to the groove wall surface of the second pressing groove (433).

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