A gear tooth research method for improving the performance of high-end vehicle drive axle and the like

Abstract

The application discloses a tooth grinding method for improving the performance of a high-end vehicle drive axle, and comprises the following steps: S1, using a comprehensive testing tool to correct the standard installation distance and offset distance of a numerical control machine tool; S2, installing a driving gear and a driven gear on the numerical control machine tool; S3, starting tooth grinding; and S4, adjusting the standard installation distance and the offset distance during the tooth grinding process. The standard installation distance and the offset distance are simultaneously adjusted, which is beneficial to grinding the small-end tooth root of an equal-height tooth acceleration surface, the large-end tooth top of the equal-height tooth acceleration surface, the small-end tooth top of an equal-height tooth deceleration surface and the large-end tooth root of the equal-height tooth deceleration surface during the grinding process, the above-mentioned grinding method is used to correct the diagonal, the gear pair MTE 1st-order transmission error is less than or equal to 20 uard, the 2nd-order transmission error is less than or equal to 5 uard, the contact area length can meet the requirement of 50%-65%, the qualified rate of the drive axle NVH bench can be more than 95%, and the quality loss of after-sales can be reduced by 3 million yuan per year.

Description

Technical Field

[0001] This application relates to the field of contour tooth grinding technology, and in particular to a grinding method for improving the performance of contour teeth in the drive axle of high-end vehicle models. Background Technology

[0002] The drive axle, located at the end of the transmission system, is a mechanism that changes the speed and torque from the transmission and transmits them to the drive wheels. A drive axle typically consists of a final drive, differential, gear transmission structure, and drive axle housing; steering drive axles also include a constant velocity joint.

[0003] Equal-height bevel gears are the core transmission structure of drive axles. After heat treatment, in order to improve the transmission noise and accuracy of gears, a grinding process is required to improve the tooth surface performance of equal-height teeth. On a special CNC machine tool, a pair of gears are rotated and ground, and a certain braking force is applied at the same time to perform cutting processing, ultimately achieving the purpose of improving the quality of the tooth surface contact area and improving gear meshing and transmission performance.

[0004] In related technologies, generally only the offset distance is adjusted. Reciprocating grinding is performed on the middle of both sides of the tooth at the same height, the middle of the small end, and the middle of the large end to ensure the tooth surface is visible and the required contact area length and position. The above grinding method has the following problems: 1. The contact area length and position of the tooth surface cannot be effectively controlled within the required range; 2. The contact area will be diagonally distributed; 3. It cannot meet the NVH bench pass rate requirements.

[0005] Therefore, it is necessary to propose a gear grinding method to improve the performance of high-end vehicle drive axles and other high-speed gears, and ensure that the contact area length meets the standard requirements. This has become an important technical problem that urgently needs to be solved. Summary of the Invention

[0006] This application provides a grinding method to improve the performance of high-end vehicle drive axles and other high-speed teeth, aiming to solve the following problems existing in the grinding process: 1. The length and position of the contact area on the tooth surface cannot be effectively controlled within the required range; 2. The contact area is diagonally distributed; 3. It cannot meet the NVH test bench pass rate requirements.

[0007] To achieve the above objectives, this application proposes a gear grinding method to improve the performance of equal-height teeth on the drive axle of high-end vehicle models. The gear grinding method includes the following steps: S1, using a comprehensive inspection tool to correct the standard mounting distance and offset distance of the CNC machine tool; S2, mounting the drive gear and driven gear onto the CNC machine tool, and meshing the driven gear with the drive gear, with equal-height teeth provided on both the drive gear and the driven gear; S3, the CNC machine tool drives the drive gear to rotate and provides braking force through the driven gear to begin gear grinding; S4, during the gear grinding process, adjusting the standard mounting distance and offset distance to change the position of the contact area of ​​the equal-height tooth surfaces between the driven gear and the drive gear.

[0008] In some embodiments, the drive gear rotates forward, and the specific method for adjusting the standard mounting distance and offset distance in S4 above is as follows:

[0009] S41. Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the equal-height tooth acceleration surface of the driving gear.

[0010] S42. Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear and the driving gear is located at the bottom of the small end of the equal-height tooth acceleration surface of the driving gear.

[0011] S43, adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the equal-height tooth acceleration surface of the driving gear.

[0012] S44. Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear and the driving gear is located at the top of the large end of the equal-height tooth acceleration surface of the driving gear.

[0013] S45, adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the constant height tooth acceleration surface of the driving gear.

[0014] In some embodiments, the drive gear reverses direction, and the specific method for adjusting the standard mounting distance and offset distance in S4 described above is as follows:

[0015] S46. Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the equal-height reduction surface of the driving gear.

[0016] S47. Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear and the driving gear is located at the top of the small end of the equal-height reduction surface of the driving gear.

[0017] S48. Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the equal-height tooth reduction surface of the driving gear.

[0018] S49. Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear and the driving gear is located at the bottom of the large end of the equal-height reduction surface of the driving gear.

[0019] S410, the standard mounting distance and offset distance are adjusted so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the equal-height reduction surface of the driving gear.

[0020] In some embodiments, the grinding teeth in S3 above include a rough grinding process and a fine grinding process. In the rough grinding process, the grinding fluid has a mesh size of 280 mesh, and in the fine grinding process, the grinding fluid has a mesh size of 320 mesh.

[0021] In some embodiments, the roughing process includes two phases, with the first phase consisting of 2-3 cycles. The value is 0.8-1.5, with 2-3 cycles in the second phase. It is 0.5-0.8.

[0022] In some embodiments, the refining process includes one phase, repeated 1-3 times. It is 0.2-0.5.

[0023] In some embodiments, the device further includes a polishing slurry nozzle for spraying polishing slurry. The polishing slurry nozzle includes: a spray body; a polishing slurry inlet disposed at one end of the spray body; an air inlet disposed on the side of the spray body; a nozzle screwed to the other end of the spray body; a polishing slurry channel disposed on the spray body and connected to the polishing slurry inlet; a mixing channel disposed inside the nozzle and connected to the polishing slurry channel; and a plurality of air inlet holes spaced circumferentially outside the mixing channel. The mixing channel, polishing slurry channel, spray body, and nozzle enclose an air intake space, and the air inlet and air inlet holes are connected to the air intake space.

[0024] In some embodiments, the mixing channel includes: a constricted portion connected to the grinding fluid channel; a mixing portion connected to the constricted portion, and an air inlet connected to the mixing portion; and a first flared portion connected to the mixing portion.

[0025] In some embodiments, the device further includes: a connector, one end of which is connected to a nozzle; an impact head, the other end of which is connected to an impact head, the impact head being coaxially disposed with the first flared portion; and a spray nozzle, which is mounted on the other end of the connector and is coaxially disposed with the impact head.

[0026] In some embodiments, the spray nozzle further includes: a collecting portion, the inner diameter of which gradually decreases; and a second flared portion, which is integrally formed with the collecting portion.

[0027] This application proposes a gear grinding method to improve the performance of equal-height teeth in the drive axle of high-end vehicle models. The grinding method includes the following steps: S1, using a comprehensive inspection fixture to correct the standard mounting distance and offset distance of the CNC machine tool; S2, mounting the drive gear and driven gear onto the CNC machine tool, and meshing the driven gear with the drive gear, with equal-height teeth on both the drive gear and driven gear; S3, the CNC machine tool drives the drive gear to rotate and provides braking force through the driven gear to begin grinding; S4, during the grinding process, adjusting the standard mounting distance and offset distance to change the position of the contact area of ​​the equal-height teeth between the driven gear and the drive gear. Using a comprehensive inspection fixture to correct the standard mounting distance, offset distance, and assembly distance of the CNC machine tool ensures the accuracy of assembly dimensions and movement, thereby ensuring the conformity of the grinding results. Simultaneously adjusting the standard installation distance and offset distance facilitates grinding the small end tooth root, large end tooth tip, small end tooth tip, and large end tooth root of the equal-height tooth acceleration surface during the grinding process. The above grinding method corrects the diagonal and ensures that the gear pair MTE first-order transmission error is ≤20uard, the second-order transmission error is ≤5uard, the contact area length meets the 50%-65% requirement, the pass rate of the drive axle NVH test bench can reach over 95%, and the after-sales quality loss is reduced by 3 million RMB / year. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0029] Figure 1 This is a technical roadmap of a gear grinding method for improving the performance of high-end vehicle drive axles and other high-performance gears according to one embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the driving gear and driven gear in one embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the grinding path for the equal-height tooth reduction surface in one embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the grinding path for the accelerated surface of the tooth contour in one embodiment of this application;

[0033] Figure 5 This is a three-dimensional structural diagram of the grinding slurry nozzle in one embodiment of this application;

[0034] Figure 6 This is a cross-sectional view of an abrasive slurry nozzle in one embodiment of this application;

[0035] Figure 7 for Figure 6 Enlarged view of part A in the middle;

[0036] Figure 8 This is a cross-sectional view of the impact head in one embodiment of this application.

[0037] In the figure: driving gear 10, equal height teeth 101, reduction surface 1011, small end 1012, large end 1013, acceleration surface 1014, driven gear 20, grinding fluid nozzle 30, spray body 31, grinding fluid inlet 32, air inlet 33, reinforcing ring 34, nozzle 35, connector 36, impact head 37, spray cylinder 38, collection part 381, second flared part 382, ​​sealing gasket 39, grinding fluid flow channel 310, first sealing ring 311, second sealing ring 312, mixing flow channel 313, air inlet 314. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0040] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0041] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0042] See Figure 1 and Figure 2 As shown, this application proposes a gear grinding method to improve the performance of high-end vehicle drive axles and other high-speed gears. The gear grinding method includes the following steps:

[0043] S1. Use a comprehensive inspection fixture to calibrate the standard mounting distance and offset distance of the CNC machine tool. The CNC machine tool used for gear grinding has three basic movements: vertical movement (or offset distance V), horizontal movement (or standard mounting distance H), and backlash movement (or assembly distance J). The preferred comprehensive inspection fixture is a three-axis calibration table equipped with high-precision sensors. The three-axis calibration table is used to accurately position and calibrate the standard mounting distance, offset distance, and assembly distance of the CNC machine tool, ensuring the accuracy of movement control and assembly in the subsequent gear grinding process, thereby improving the stability and result conformity of the gear grinding process. The three-axis calibration table and the sensors on it are mature existing technologies, and no restrictions are placed on the specific structure of the three-axis calibration table and the sensors on it here.

[0044] S2. Install the driving gear 10 and driven gear 20 onto the CNC machine tool, and make the driven gear 20 mesh with the driving gear 10. Both the driving gear 10 and the driven gear 20 are provided with equal-height teeth 101. When viewed from the large end 1013 to the small end 1012, the tooth depth of the equal-height teeth 101 is the same, and the two lines of its addendum circle and pitch circle are parallel. Since the equal-height teeth 101 are machined by end face hobbing, they have better usability and impact load resistance, and can better meet the requirements of high-speed, high-ratio, low-noise, and high-stability drive axles of high-end automobiles. After the driving gear 10 and driven gear 20 are assembled onto the CNC machine tool, the driven gear 20 is made to mesh with the driving gear 10 by controlling the movement of the driven gear 20 in the V / H / J directions.

[0045] S3. The CNC machine tool drives the drive gear 10 to rotate, and provides braking force through the driven gear 20 to begin gear grinding. The speed of the drive gear 10 should be higher than 2200 r / min. The high speed of the drive gear 10 is conducive to efficient gear grinding. The CNC machine tool uses an eddy current brake to provide braking force, with a braking torque between 8 N*m and 10 N*m. Appropriate braking load during gear grinding helps to improve grinding efficiency and shorten grinding time, and also prevents over-grinding.

[0046] S4. During the gear grinding process, adjust the standard mounting distance and offset distance to change the position of the contact area of ​​the tooth surfaces of the equal-height teeth 101 between the driven gear 20 and the driving gear 10. Adjusting the offset distance (vertical movement) will adjust the movement of the contact area of ​​the equal-height teeth 101 between the small end 1012 and the large end 1013 on the tooth surface; adjusting the standard mounting distance (horizontal movement) allows the contact area of ​​the equal-height teeth 101 to move between the tooth tip or tooth root on the tooth surface and can control diagonal contact. Adjusting the assembly distance (backlash movement) is used in conjunction with the vertical and horizontal movements to control the backlash between the driving gear 10 and the driven gear 20, ensuring that the backlash remains consistent throughout the gear grinding cycle. It is understood that after adjusting the standard mounting distance and offset distance, the assembly distance also needs to be adjusted to ensure that the backlash remains consistent throughout the gear grinding cycle. Simultaneously adjusting the standard installation distance and offset distance facilitates grinding the root of tooth 1012 at the small end of the acceleration surface 1014 of the equal-height tooth 101, the tip of tooth 1013 at the large end of the acceleration surface 1014 of the equal-height tooth 101, the tip of tooth 1012 at the small end of the deceleration surface 1011 of the equal-height tooth 101, and the root of tooth 1013 at the large end of the deceleration surface 1011 of the equal-height tooth 101. By correcting the diagonal through the above grinding method, it ensures that the contact area position length meets the standard requirements and the transmission error meets the requirements.

[0047] Specifically, a comprehensive inspection tool is used to calibrate the standard mounting distance, offset distance, and assembly distance of the CNC machine tool, ensuring the accuracy of assembly dimensions and movement, thereby ensuring the conformity of the gear grinding results. Simultaneously adjusting the standard mounting distance and offset distance facilitates grinding the root of the small end 1012 of the 1011 acceleration surface 1014, the tip of the large end 1013 of the 1011 acceleration surface 1014, the tip of the small end 1012 of the 1011 reduction surface 1011, and the root of the large end 1013 of the 1011 reduction surface 1011 during the grinding process. This grinding method corrects the diagonal and ensures that the gear pair MTE first-order transmission error is ≤20uard, the second-order transmission error is ≤5uard, the contact area length meets the 50%-65% requirement, and the pass rate of the drive axle NVH test bench reaches over 95%, reducing after-sales quality losses by 3 million RMB per year.

[0048] See Figure 3 and Figure 4As shown, in some embodiments, the driving gear 10 rotates forward. During the forward rotation of the driving gear 10, the acceleration surface 1014 of the contour teeth 101 is ground. During the grinding of the acceleration surface 1014, the specific method for adjusting the standard mounting distance and offset distance in S4 is as follows: S41, adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located in the middle of the acceleration surface 1014 of the contour teeth 101 of the driving gear 10; S42, reduce the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located in the middle of the acceleration surface 1014 of the contour teeth 101 of the driving gear 10; S43. Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located in the middle of the acceleration surface 1014 of the equal-height teeth 101 of the driving gear 10; S44. Increase the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located in the middle of the acceleration surface 1014 of the equal-height teeth 101 of the driving gear 10; S45. Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located in the middle of the acceleration surface 1014 of the equal-height teeth 101 of the driving gear 10. When the driving gear 10 reverses direction, the reduction surface 1011 of the equal-height teeth 101 is ground. During the grinding of the reduction surface 1011, the specific method for adjusting the standard mounting distance and offset distance in step S4 is as follows: S46, Adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located in the middle of the reduction surface 1011 of the equal-height teeth 101 of the driving gear 10; S47, Increase the standard mounting distance and decrease the offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located in the middle of the reduction surface 1011 of the equal-height teeth 101 of the driving gear 10. Top of end 1012; S48, adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located in the middle of the reduction surface 1011 of the equal-height teeth 101 of the driving gear 10; S49, decrease the standard mounting distance and increase the offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located at the bottom of the large end 1013 of the reduction surface 1011 of the equal-height teeth 101 of the driving gear 10; S410, adjust the standard mounting distance and offset distance so that the tooth surface contact area between the driven gear 20 and the driving gear 10 is located in the middle of the reduction surface 1011 of the equal-height teeth 101 of the driving gear 10. A mathematical model is established based on the parameters of the driven gear 20 of the driving gear 10, and the corresponding V / H / J adjustment amount is determined based on the known position of the contact point on the tooth surface. Only one adjustment strategy is provided in this application, but other adjustment strategies can be selected according to different installation conditions. During the adjustment of the standard mounting distance and offset distance, it is also necessary to adjust the assembly distance backlash motion simultaneously to coordinate with the vertical and horizontal motion, control the backlash between the driving gear 10 and the driven gear 20, and ensure that the backlash remains consistent throughout the gear grinding cycle.

[0049] In some embodiments, S3 above includes a rough grinding process and a fine grinding process. In the rough grinding process, the grinding slurry has a mesh size of 280 mesh, and in the fine grinding process, the grinding slurry has a mesh size of 320 mesh. The grinding slurry uses silicon carbide as the abrasive and also contains suspending oil. The suspending oil is used to ensure that the silicon carbide remains in a suspended state; the type of suspending oil is not specifically limited here. The grinding slurry also contains suspending thickeners, rheology modifiers, triggering agents, and other components.

[0050] In this embodiment, two CNC machine tools are used to complete the gear grinding. One CNC machine tool is used to complete the rough grinding process, and the other is used to complete the fine grinding process. The rough grinding process corrects the diagonal by grinding the root of the small end 1012 of the tooth 101 ... The contact area length and transmission error must meet the standard requirements. Furthermore, the grinding process, which combines rough and fine grinding, ensures a stable tooth surface roughness of ≤Ra1.6.

[0051] In some embodiments, the roughing process includes two phases, each comprising two stages. In both phases, the grinding path is the same as that in S4 described above, and will not be repeated here. The first phase consists of 2-3 cycles, with a midpoint dwell time of 5-10 seconds. It is 0.8-1.5. Main spindle speed For braking pressure, the second phase cycles 2-3 times, with a midpoint dwell time of 5-10 seconds. The value is 0.5-0.8. The refining process includes one phase, 1-3 cycles, with a midpoint dwell time of 15-30 seconds. The value is 0.2-0.5, and the processing time for the entire roughing process and the entire finishing process is 7-10 minutes respectively.

[0052] See Figure 5 , Figure 6 and Figure 7As shown, in some embodiments, a polishing slurry nozzle 30 is also included. The polishing slurry nozzle 30 is used to spray polishing slurry onto the tooth grooves at the meshing point of the driving gear 10 and the driven gear 20. The polishing slurry needs to be replaced periodically. This is because metal cut from the contour teeth 101, free carbon particles on the driving gear 10 and the driven gear 20, etc., can all enter the polishing slurry during polishing. In addition, silicon carbide deteriorates during polishing, and this deterioration can also contaminate the polishing slurry. In order to maintain a stable contact area and polishing parameters, a polishing slurry replacement schedule needs to be established. The grinding slurry nozzle 30 includes: a nozzle body 31; a grinding slurry inlet 32, which is located at one end of the nozzle body 31; the nozzle body 31 is the main structure of the nozzle, and other structures on the grinding slurry nozzle 30 are directly or indirectly connected to the nozzle body 31; the grinding slurry inlet 32 ​​is connected to the head of the grinding slurry discharge pipe; an air inlet 33 is located on the side of the nozzle body 31 and is connected to the head of the air intake pipe; a nozzle 35 is screwed to the other end of the nozzle body 31; the end of the nozzle 35 away from the nozzle body 31 has an opening; a grinding slurry flow channel 310 is located on the nozzle body 31 and connects to the grinding slurry inlet 32; a mixing channel 313 is located inside the nozzle 35 and connects to the grinding slurry flow channel 310; the mixing channel 313 connects to the nozzle body 31. The body 31 has an opening with multiple air inlets 314, which are spaced circumferentially on the outside of the mixing channel 313. The mixing channel 313, the polishing fluid channel 310, the spray body 31, and the nozzle 35 enclose an air intake space. The outer wall of the mixing channel 313 and the polishing fluid channel 310, together with the inner wall of the spray body 31 and the nozzle 35, form an air intake space. The air inlet 33 connects to the air intake space, and the air inlets 314 connect to the air intake space. The polishing fluid flows into the polishing fluid channel 310 from the polishing fluid inlet 32, and then flows into the mixing channel 313 from the polishing fluid channel 310. High-pressure air is discharged into the air intake space from the air inlet 33, and then into the mixing channel 313 from the air inlets 314, where it mixes with the polishing fluid in the mixing channel 313. The powerful gas-liquid shear force tears the polishing fluid into droplets, forming a polishing fluid spray. The polishing slurry is sprayed into the tooth grooves of the driving gear 10 and driven gear 20. By atomizing the polishing slurry, firstly, the slurry droplets can be evenly adhered to the surface of the driving gear 10 or driven gear 20, avoiding localized accumulation or loss of slurry due to gravity or surface tension. Secondly, it allows the polishing slurry to better penetrate the side clearances between the driving gear 10 and driven gear 20, which is beneficial for improving the polishing effect. Thirdly, by atomizing the polishing slurry and spraying it as needed, the amount of polishing slurry required for circulation can be reduced. Since the polishing slurry needs to be replaced regularly, reducing the amount of polishing slurry required can effectively reduce polishing costs. Finally, the high impact force generated by mixing the polishing slurry with high-pressure air can effectively re-stir the slurry, preventing the aggregation and precipitation of silicon carbide within the slurry, which is beneficial for improving the polishing effect.

[0053] In this embodiment, the system also includes a grinding fluid source, a spray pump, a grinding fluid recovery structure, a heat exchange and cooling mechanism, and an air compressor. The grinding fluid source provides the grinding fluid, the spray pump provides power to the grinding fluid, allowing the grinding fluid to flow from the grinding fluid inlet 32 ​​into the grinding fluid inlet. The grinding fluid recovery structure recovers the grinding fluid, which can then flow back to the grinding fluid source after passing through the heat exchange and cooling mechanism. The grinding fluid in the grinding fluid source needs to be replaced periodically. The air compressor provides high-pressure air, allowing the high-pressure air to flow from the intake pipe into the air inlet 33. Since the grinding fluid source, spray pump, grinding fluid recovery structure, heat exchange and cooling mechanism, and air compressor are all mature existing technologies and are not the inventive points of this application, their structures are not specifically limited here.

[0054] This system also includes a sealing gasket 39, which is placed between the grinding fluid channel 310 and the spray body 31. The sealing gasket 39 effectively prevents the grinding fluid from flowing into the air intake space. A first sealing ring 311 is also provided between the grinding fluid channel 310 and the spray body 31 to prevent the grinding fluid from flowing into the air intake space. A second sealing ring 312 is also provided between the spray body 31 and the nozzle 35 to prevent high-pressure air leakage and maintain the pressure of the high-pressure air, thereby ensuring the atomization effect. Due to the large air pressure in the air intake space, in order to ensure the stability of the screw connection between the spray body 31 and the nozzle 35, a reinforcing ring 34 is screwed onto the outside of the spray body 31. The reinforcing ring 34 is located at the screw connection between the spray body 31 and the nozzle 35.

[0055] See Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, the mixing channel 313 includes: a constricted section, which connects to the polishing slurry channel 310; a channel with a gradually decreasing cross-sectional area is provided within the constricted section, the maximum cross-sectional area of ​​which is equal to the cross-sectional area of ​​the channel within the polishing slurry channel 310, allowing the polishing slurry to smoothly transition into the constricted section. Because the cross-sectional area of ​​the channel within the constricted section gradually decreases, the flow velocity of the polishing slurry gradually increases within the constricted section; a mixing section, which connects to the constricted section, and an air inlet 314, which connects to the mixing section; the polishing slurry with its maximum flow velocity within the constricted section flows into the mixing section, where the high-speed polishing slurry mixes with the high-speed gas, increasing the gas-liquid shear force generated within the polishing slurry and improving the atomization effect of the polishing slurry. The air inlet 314 is located adjacent to the first flared section within the mixing section. The first flared section connects to the mixing section. The atomized grinding fluid is sprayed out from the first flared part, which has a flow channel with a gradually increasing cross-sectional area. The design of the first flared part is conducive to increasing the spraying area of ​​the atomized grinding fluid.

[0056] See Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, in some embodiments, the device further includes: a connector 36, one end of which is connected to a nozzle 35; the connector 36 includes a first bend and a second bend connected to each other, the first bend of the connector 36 is welded to the nozzle 35, and the nozzle 35 is also provided with a corresponding welding groove; an impact head 37, the other end of the connector 36 is connected to the impact head 37, the impact head 37 is coaxially arranged with the first flared portion; the impact head 37 is welded to one side of the second bend, the impact head 37 is a rotating body, and along the direction away from the nozzle 35, the cross-sectional area of ​​the impact head 37 gradually increases and then gradually decreases; and a spray nozzle 38, which is installed at the other end of the connector 36 and is coaxially arranged with the impact head 37. The spray nozzle 38 is welded to the other side of the second bend. The atomized grinding slurry spray impacts the impact head 37. Under the action of the impact head 37, firstly, the spray area of ​​the grinding slurry is increased, allowing it to better cover the driving gear 10 and the driven gear. Secondly, the impact force helps form smaller grinding slurry droplets, allowing the grinding slurry to penetrate more deeply into the side gap between the driving gear 10 and the driven gear 20, thus improving the grinding effect. Finally, the impact force helps to disperse the abrasive more evenly into the suspended oil droplets, preventing abrasive aggregation within the droplets. When the atomized grinding slurry spray impacts the impact head 37, most of the spray impacts and splashes away after impact. A small portion of the spray, guided by the impact head 37, flows into the spray nozzle 38 and is sprayed from the nozzle 38 onto the driving gear 10 or the driven gear 20. The design of the spray nozzle 38 helps to prevent insufficient distribution of grinding slurry droplets at the axis of the nozzle 35, thus avoiding uneven distribution of the grinding slurry.

[0057] See Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, in some embodiments, the spray nozzle 38 further includes: a collecting portion 381, the inner diameter of which gradually decreases; the grinding slurry spray flowing into the spray nozzle 38 is collected in the middle by the collecting portion 381, and the grinding slurry droplets collide in the middle, thereby dispersing silicon carbide more evenly into the suspended oil droplets and preventing silicon carbide from agglomerating in the suspended oil droplets. A second flared portion 382 is integrally formed with the collecting portion 381. After the collision, the grinding slurry droplets are sprayed onto the driving gear 10 or the driven gear 20 through the second flared portion 382, ​​which helps to increase the spraying area of ​​the grinding slurry droplets. The arrangement of the collecting portion 381 and the impact head 37 in the spray nozzle 38 helps the grinding slurry droplets to be affected by secondary impact force, thereby making the silicon carbide distribution in the grinding slurry droplets more uniform and improving the grinding effect.

[0058] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A method for improving the performance of high-speed gears such as drive axles in high-end vehicle models, characterized in that, The tooth grinding method includes the following steps: S1. Use a comprehensive inspection tool to calibrate the standard mounting distance and offset distance of the CNC machine tool; S2. Install the driving gear and the driven gear onto the CNC machine tool, and make the driven gear mesh with the driving gear. Both the driving gear and the driven gear are provided with teeth of equal height. S3. The CNC machine tool drives the driving gear to rotate and provides braking force through the driven gear to start grinding. S4. During the gear grinding process, adjust the standard mounting distance and the offset distance to change the position of the contact area of ​​the same height tooth surface between the driven gear and the driving gear; When the drive gear rotates forward, the specific method for adjusting the standard mounting distance and the offset distance in S4 is as follows: S41. Adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the constant height tooth acceleration surface of the driving gear. S42. Adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located at the bottom of the small end of the equal-height tooth acceleration surface of the driving gear; S43. Adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the constant height tooth acceleration surface of the driving gear; S44. Adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located at the top of the large end of the equal-height tooth acceleration surface of the driving gear. S45. Adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the constant height tooth acceleration surface of the driving gear.

2. The gear grinding method for improving the performance of high-end vehicle drive axles and other high-speed gears according to claim 1, characterized in that, The specific method for adjusting the standard mounting distance and the offset distance in S4, as described above, is as follows: When the drive gear reverses, the method is as follows: S46. Adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the equal-height reduction surface of the driving gear. S47. Adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located at the top of the small end of the equal-height reduction surface of the driving gear. S48. Adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the equal-height tooth reduction surface of the driving gear; S49. Adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located at the bottom of the large end of the equal-height reduction surface of the driving gear. S410, adjust the standard mounting distance and the offset distance so that the tooth surface contact area between the driven gear and the driving gear is located in the middle of the equal-height reduction surface of the driving gear.

3. The gear grinding method for improving the performance of high-end vehicle drive axles and other high-speed gears according to claim 1, characterized in that, In the above S3, the grinding teeth include a rough grinding process and a fine grinding process. In the rough grinding process, the grinding fluid has a mesh size of 280 mesh, and in the fine grinding process, the grinding fluid has a mesh size of 320 mesh.

4. The gear grinding method for improving the performance of high-end vehicle drive axles and other high-speed gears according to claim 3, characterized in that, The roughing process includes two phases, with the first phase consisting of 2-3 cycles. The value is 0.8-1.5, with 2-3 cycles in the second phase. It is 0.5-0.

8.

5. The gear grinding method for improving the performance of high-end vehicle drive axles and other high-speed gears according to claim 3, characterized in that, The refining process includes one phase, with 1-3 cycles. It is 0.2-0.

5.

6. A gear grinding method for improving the performance of high-end vehicle drive axles and other high-speed gears according to any one of claims 1-5, characterized in that, It also includes a polishing slurry nozzle (30) for spraying polishing slurry, the polishing slurry nozzle (30) comprising: The nozzle (31); A grinding fluid inlet (32) is provided at one end of the spray body (31); An air inlet (33) is provided on the side of the nozzle (31); The nozzle (35) is screwed to the other end of the nozzle body (31); A grinding fluid channel (310) is provided on the spray body (31) and the grinding fluid channel (310) is connected to the grinding fluid inlet (32). A mixing channel (313) is disposed within the nozzle (35) and the mixing channel (313) is connected to the grinding fluid channel (310). Multiple air inlet holes (314) are arranged circumferentially on the outside of the mixing channel (313). The mixing channel (313), the grinding fluid channel (310), the spray body (31) and the nozzle (35) enclose an air intake space. The air inlet (33) is connected to the air intake space. The air inlet holes (314) are connected to the air intake space.

7. The gear grinding method for improving the performance of high-end vehicle drive axles and other high-speed gears according to claim 6, characterized in that, The mixing channel (313) includes: The constricted portion is connected to the grinding fluid channel (310). A mixing section, the mixing section being connected to the constricted section, and the air inlet (314) being connected to the mixing section; A first flared portion, which is connected to the mixing portion.

8. The gear grinding method for improving the performance of high-end vehicle drive axles and other high-speed gears according to claim 7, characterized in that, Also includes: A connector (36), one end of which is connected to the nozzle (35); Impact head (37), the other end of the connector (36) is connected to the impact head (37), and the impact head (37) is coaxially arranged with the first flared part; The spray nozzle (38) is installed at the other end of the connector (36) and is coaxially arranged with the impact head (37).

9. The gear grinding method for improving the performance of high-end vehicle drive axles and other high-speed gears according to claim 8, characterized in that, The spray nozzle (38) also includes: The inner diameter of the collecting part (381) gradually decreases; The second flared portion (382) is integrally formed with the gathering portion (381).

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