Transmission shaft assembly method and device

Abstract

This application provides a driveshaft assembly method and apparatus, relating to the field of vehicle driveshaft technology. The method includes: measuring the dynamic balance of a spline joint and a connecting disc used on the driveshaft; identifying target spline joints and target connecting discs whose dynamic balance is greater than or equal to a preset dynamic balance; establishing a correspondence between the target spline joints and target connecting discs based on the dynamic balance; and assembling the target spline joints and target connecting discs onto the driveshaft according to the correspondence. This method, by establishing a correspondence between spline joints and connecting discs with large dynamic balance, and assembling the spline joints and connecting discs onto the driveshaft according to this correspondence, effectively improves the initial dynamic balance performance of the driveshaft without increasing its production cost, thereby enhancing the driveshaft's stability and ensuring the vehicle's smooth and comfortable operation.

Description

Technical Field

[0001] This application relates to the field of vehicle driveshaft technology, and in particular to a driveshaft assembly method and apparatus. Background Technology

[0002] In vehicle transmission systems, the spline joints and connecting discs of drive shafts often have rough, unfinished surfaces due to large forging errors, resulting in dynamic imbalances exceeding standard values. If these spline joints with imbalances exceeding the standard values ​​are arbitrarily assembled with the connecting discs, the initial dynamic balance of the drive shaft is likely to be poor, increasing abnormal vibrations during operation and potentially causing resonance between the drive shaft and the vehicle, thus affecting the vehicle's smoothness and comfort.

[0003] In existing technologies, during the production of drive shafts, balance plates are typically welded onto the drive shaft to address the issue of poor initial dynamic balance caused by excessive dynamic imbalance between the spline joint and the connecting disc. Alternatively, the dynamic balance performance of the drive shaft can be improved by enhancing the manufacturing process of the spline joint and the connecting disc to increase the precision of their components.

[0004] However, welding balance plates onto the drive shaft increases its instability. While improving the manufacturing process of spline joints and connecting discs can improve the initial dynamic balance of the drive shaft, it increases its production cost. Summary of the Invention

[0005] This application provides a driveshaft assembly method and apparatus, which establishes a correspondence between a spline joint and a connecting disc with a large dynamic balance, and assembles the spline joint and the connecting disc onto the driveshaft according to the correspondence, thereby effectively improving the initial dynamic balance performance of the driveshaft, enhancing the stability of the driveshaft, and ensuring the smoothness and comfort of vehicle operation without increasing the production cost of the driveshaft.

[0006] In a first aspect, this application provides a method for assembling a drive shaft, the method comprising:

[0007] Measure the dynamic balance of the spline joint and the connecting disc used on the drive shaft;

[0008] Select target spline joints with dynamic balance values ​​greater than or equal to preset dynamic balance values, and target connecting discs with dynamic balance values ​​greater than or equal to preset dynamic balance values. The preset dynamic balance value is positively correlated with the torque of the drive shaft.

[0009] Establish a correspondence between the target spline joint and the target connecting plate based on the dynamic balance values;

[0010] According to the corresponding relationship, assemble the target spline joint and the target connecting plate onto the drive shaft.

[0011] In one possible design, a correspondence is established between the target spline joint and the target connecting disc based on the dynamic balance values, including:

[0012] Mark the phase of the offset point corresponding to the dynamic balance on the target spline joint and the target connecting plate;

[0013] Establish the correspondence between the target spline joint and the target connecting plate based on the phase of the bias.

[0014] In one possible design, the correspondence between the target spline joint and the target connecting disc is established based on the phase of the bias point, including:

[0015] Mark the dynamic balance values ​​on the target spline joint and the target connecting plate;

[0016] For each target spline joint, select two target connecting discs corresponding to the target spline joint based on the dynamic balance and eccentricity phase of the target spline joint.

[0017] In one possible design, the spline joint with the bias phase in the first and / or third quadrant corresponds to the connecting plate with the bias phase in the second and / or fourth quadrant, and the spline joint with the bias phase in the second and / or fourth quadrant corresponds to the connecting plate with the bias phase in the first and / or third quadrant.

[0018] In one possible design, the difference between the total dynamic balance of the two target connecting discs and the dynamic balance of the target spline joint is less than or equal to a preset difference threshold.

[0019] In one possible design, the method also includes:

[0020] Measure the internal spline dimensions of the spline hub used on the drive shaft and the external spline dimensions of the target spline joint;

[0021] Determine the fit clearance between the spline hub and the target spline joint based on the difference between the internal spline size and the external spline size;

[0022] When the fit clearance is less than or equal to the preset clearance, assemble the splined hub onto the target splined joint;

[0023] When the clearance is greater than the preset clearance, the machining dimensions of the spline joint are adjusted, and the spline joint machined with the adjusted machining dimensions is assembled with the spline hub.

[0024] Secondly, this application provides a drive shaft assembly device, which includes: a measuring unit, a screening unit, a grouping unit, and an assembly unit;

[0025] The measuring unit is used to measure the dynamic balance of the spline joint and the connecting disc on the drive shaft.

[0026] The screening unit is used to screen out target spline joints with dynamic balance values ​​greater than or equal to preset dynamic balance values, as well as target connecting discs with dynamic balance values ​​greater than or equal to preset dynamic balance values. The preset dynamic balance value is positively correlated with the torque of the drive shaft.

[0027] Grouping units are used to establish a correspondence between the target spline joint and the target connecting plate based on the dynamic balance amount;

[0028] The assembly unit is used to assemble the target spline joint and the target connecting disc onto the drive shaft according to the corresponding relationship.

[0029] This application provides a method and apparatus for assembling a drive shaft. The method includes: first, measuring the dynamic balance of the spline joint and the connecting plate used on the drive shaft; then, selecting target spline joints and target connecting plates whose dynamic balance is greater than or equal to a preset dynamic balance, wherein the preset dynamic balance is positively correlated with the torque of the drive shaft; next, establishing a correspondence between the target spline joint and the target connecting plate based on the dynamic balance; and finally, assembling the target spline joint and the target connecting plate onto the drive shaft according to the correspondence. This achieves the following technical effects: by measuring the dynamic balance of the spline joint and the connecting plate, selecting target spline joints and target connecting plates whose dynamic balance is not less than a preset dynamic balance, and establishing a correspondence between the target spline joint and the target connecting plate based on the dynamic balance, the target spline joint and the target connecting plate can be accurately assembled onto the drive shaft according to the correspondence. This eliminates the need to improve the manufacturing process of spline joints and connecting discs, and avoids the addition of extra components. It effectively solves the problem of poor initial dynamic balance performance of the driveshaft caused by excessive dynamic balance of spline joints and connecting discs, without increasing the production cost of the driveshaft. This reduces abnormal vibration of the driveshaft during vehicle operation, thereby improving the stability of the driveshaft, the smoothness and comfort of vehicle operation, and enhancing driving safety. For spline joints and connecting discs with dynamic balance values ​​less than the preset dynamic balance value, they can be directly assembled onto the driveshaft according to the existing installation process, ensuring the initial dynamic balance performance of the driveshaft while avoiding unnecessary redundant operations. By using an existing dynamic balancing machine to accurately measure the dynamic balance value and center of gravity position of the spline joints, as well as the dynamic balance value and center of gravity position of the connecting discs, the problem of how to measure the dynamic balance value of spline joints and connecting discs is solved. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0032] Figure 1 A schematic diagram of the structure of a transmission shaft provided in this application embodiment. Figure 1 ;

[0033] Figure 2 A flowchart illustrating a drive shaft assembly method provided in this application embodiment. Figure 1 ;

[0034] Figure 3 A flowchart illustrating a drive shaft assembly method provided in this application embodiment. Figure 2 ;

[0035] Figure 4 A schematic diagram of the structure of a transmission shaft provided in this application embodiment. Figure 2 ;

[0036] Figure 5 A flowchart illustrating a drive shaft assembly method provided in this application embodiment. Figure 3 ;

[0037] Figure 6 A schematic diagram of the structure of a transmission shaft provided in this application embodiment. Figure 2 .

[0038] Figure label:

[0039] 10-Connecting disc; 20-Universal joint; 30-Splined joint; 40-Splined hub; 50-Shaft tube; 60-Universal joint fork; 301-Sheath; 101-Specific location of the dynamic balance of the connecting disc; 302-Specific location of the dynamic balance of the splined joint; 303-External spline. Detailed Implementation

[0040] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0041] In the embodiments of this application, the terms "first" and "second" are used to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that "first" and "second" do not necessarily imply difference. It should be noted that in the embodiments of this application, the words "exemplary" or "for example" are used to indicate that something is being used as an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in this application should not be construed as being better or more advantageous than other embodiments or design schemes. Specifically, the use of "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner. In the embodiments of this application, "at least one" refers to one or more, and "more than one" refers to two or more.

[0042] It should be noted that the phrase "at...time" in the embodiments of this application can refer to the instant at which a certain situation occurs, or to a period of time after the occurrence of a certain situation; the embodiments of this application do not specifically limit this. Furthermore, the drive shaft assembly method provided in the embodiments of this application is merely an example; a drive shaft assembly method may include more or fewer elements.

[0043] To facilitate a clear description of the technical solutions in the embodiments of this application, some terms and technologies involved in the embodiments of this application will be briefly introduced below:

[0044] Dynamic balance quantity, also known as unbalance quantity, is a physical quantity used to describe the equilibrium state of a rotating object during rotation. It reflects the degree to which the object deviates from its equilibrium state. In rotating machinery, it typically refers to the mass parameter that needs to be adjusted during balancing to reduce unbalanced forces and vibrations caused by uneven mass distribution.

[0045] With the development of commercial vehicles, vehicle smoothness and comfort have received increasing attention. As a crucial transmission component in the vehicle's drivetrain, the driveshaft transmits power from the engine to the drive axle. Due to its relatively long length and high-speed rotation during operation, abnormal vibration of the driveshaft or resonance with the vehicle significantly impacts vehicle smoothness and comfort. Therefore, improving the dynamic balance of the driveshaft can effectively reduce abnormal vibration, decrease the possibility of resonance between the driveshaft and the vehicle, thereby extending the driveshaft's service life and improving vehicle safety.

[0046] In vehicle driveshafts, spline joints and connecting discs typically have rough, unfinished surfaces. These rough surfaces often have significant forging errors, causing the dynamic balance of the spline joint and connecting disc to exceed standard values. If spline joints and connecting discs with excessive dynamic balance are arbitrarily assembled, it can easily lead to poor initial dynamic balance of the driveshaft, increasing abnormal vibrations during operation and potentially even causing resonance between the driveshaft and the vehicle, affecting the vehicle's smoothness and comfort.

[0047] In the existing technology, two main methods are adopted to solve this technical problem: one is to weld balance plates onto the drive shaft to adjust its dynamic balance performance; the other is to improve the initial dynamic balance performance of the drive shaft by improving the manufacturing process precision of the spline joint and connecting disc.

[0048] However, when the dynamic balance of the spline joint or connecting disc is too large, welding balance plates to the drive shaft usually cannot effectively improve the initial dynamic balance performance of the drive shaft. Moreover, welded balance plates increase the structural complexity of the drive shaft and are prone to falling off, increasing the potential instability of the drive shaft. While improving the manufacturing process of spline joints and connecting discs can improve the initial dynamic balance performance of the drive shaft, it increases the production cost of the drive shaft.

[0049] Based on this, this application proposes a driveshaft assembly method and apparatus, applicable to the field of vehicle driveshaft technology, aiming to solve the aforementioned technical problems of the prior art. By establishing a correspondence between a spline joint with a large dynamic balance and a connecting disc with an equally large dynamic balance, and precisely assembling them onto the driveshaft according to this correspondence, higher requirements are eliminated for the manufacturing processes of the spline joint and connecting disc, and no additional components are needed. That is, without increasing the production cost of the driveshaft, the problem of poor initial dynamic balance performance of the driveshaft caused by excessive dynamic balance of the spline joint and connecting disc is effectively solved. This reduces abnormal vibration of the driveshaft during vehicle operation, thereby improving the stability of the driveshaft, the smoothness and comfort of vehicle operation, and enhancing driving safety.

[0050] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0051] Figure 1 A schematic diagram of the structure of a transmission shaft provided in this application embodiment. Figure 1 To facilitate understanding of the assembly process, internal structure, and positions, connections, and relationships between the various components of the drive shaft in the embodiments of this application, in Figure 1 The exploded view of the drive shaft structure is shown in the figure.

[0052] like Figure 1 As shown, the drive shaft includes: a connecting disc 10, a universal joint 20, a spline joint 30, a spline hub 40, a shaft tube 50, and a universal joint fork 60.

[0053] The spline joint 30 includes a sheath 301. The connecting disc 10 and the universal joint 20 are located at both ends of the drive shaft, with the connecting disc 10 located at the outermost end of the drive shaft. The connecting disc 10 can be connected to the spline joint 30 or the universal joint fork 60 via the universal joint 20. The spline joint 30 can be connected to one end of the drive shaft tube 50 via the spline hub 40, and the other end of the tube 50 is connected to the universal joint fork 60.

[0054] The technical solution of this application will be described in detail below with reference to specific embodiments.

[0055] Figure 2 A flowchart illustrating a drive shaft assembly method provided in this application embodiment. Figure 1 This method can be applied to... Figure 1 Assemble the drive shaft as shown, such as Figure 2 As shown, the method includes:

[0056] S201. Measure the dynamic balance of the spline joint and the connecting disc used on the drive shaft.

[0057] Specifically, existing dynamic balancing machines can be used to accurately measure the dynamic balance of spline joints and their center of gravity, as well as the dynamic balance of connecting discs and their center of gravity. The process involves: first, mounting the spline joint or connecting disc onto the dynamic balancing machine, ensuring a secure and centered installation to avoid installation errors affecting the accuracy of the measurement results; next, setting the parameters of the dynamic balancing machine according to the size and weight of the workpiece, such as rotation speed, test time, and sensitivity; then, starting the dynamic balancing machine to rotate the spline joint or connecting disc at the set speed. This allows for the measurement of the vibration of the spline joint or connecting disc, obtaining the magnitude and phase information of the dynamic balance. The phase information indicates the specific position of the dynamic balance on the spline joint or the connecting disc.

[0058] In addition to using a dynamic balancing machine to measure the dynamic balance of spline joints or connecting discs, other methods can be used to detect the dynamic balance, such as vibration analysis and current detection. There are no specific restrictions here, and the appropriate detection method can be selected according to the actual situation.

[0059] S202. Select target spline joints whose dynamic balance is greater than or equal to the preset dynamic balance, and target connecting discs whose dynamic balance is greater than or equal to the preset dynamic balance.

[0060] Specifically, the preset dynamic balance value is positively correlated with the torque of the drive shaft. The greater the torque of the drive shaft, the greater the preset dynamic balance value of the drive shaft.

[0061] For spline joints and connecting discs with dynamic balance values ​​less than the preset dynamic balance value, they can be directly assembled onto the drive shaft according to the installation process in the existing technology.

[0062] S203. Establish a correspondence between the target spline joint and the target connecting plate based on the dynamic balance.

[0063] Specifically, for the selected target spline joints and target connecting discs whose dynamic balance is not less than the preset dynamic balance, a correspondence can be established based on the measured dynamic balance. For example, a correspondence can be established based on the magnitude of the dynamic balance; or a correspondence can be established based on the magnitude and phase information of the dynamic balance, etc.

[0064] S204. Assemble the target spline joint and the target connecting disc onto the drive shaft according to the corresponding relationship.

[0065] Specifically, after determining the correspondence between the target spline joint and the target connecting plate, the target spline joint and the target connecting plate can be assembled onto the drive shaft according to the correspondence to balance the initial dynamic balance performance of the drive shaft.

[0066] This embodiment provides a drive shaft assembly method, which includes: first, measuring the dynamic balance of the spline joint and the connecting plate used on the drive shaft; then, selecting target spline joints and target connecting plates whose dynamic balance is greater than or equal to a preset dynamic balance, wherein the preset dynamic balance is positively correlated with the torque of the drive shaft; then, establishing a correspondence between the target spline joint and the target connecting plate based on the dynamic balance; and finally, assembling the target spline joint and the target connecting plate onto the drive shaft according to the correspondence.

[0067] The following technical effects are achieved: by measuring the dynamic balance of the spline joint and the dynamic balance of the connecting plate, target spline joints with dynamic balance not less than the preset dynamic balance and target connecting plates with dynamic balance not less than the preset dynamic balance are selected, and a correspondence is established between the target spline joint and the target connecting plate according to the dynamic balance, so as to accurately assemble the target spline joint and the target connecting plate onto the drive shaft according to the correspondence. This eliminates the need to improve the manufacturing process of spline joints and connecting discs, and avoids the addition of extra components. It effectively solves the problem of poor initial dynamic balance performance of the driveshaft caused by excessive dynamic balance of spline joints and connecting discs, without increasing the production cost of the driveshaft. This reduces abnormal vibration of the driveshaft during vehicle operation, thereby improving the stability of the driveshaft, the smoothness and comfort of vehicle operation, and enhancing driving safety. For spline joints and connecting discs with dynamic balance values ​​less than the preset dynamic balance value, they can be directly assembled onto the driveshaft according to the existing installation process, ensuring the initial dynamic balance performance of the driveshaft while avoiding unnecessary redundant operations. By using an existing dynamic balancing machine to accurately measure the dynamic balance value and center of gravity position of the spline joints, as well as the dynamic balance value and center of gravity position of the connecting discs, the problem of how to measure the dynamic balance value of spline joints and connecting discs is solved.

[0068] Figure 3 A flowchart illustrating a drive shaft assembly method provided in this application embodiment. Figure 2 .like Figure 3 As shown, in this embodiment... Figure 2 Based on the embodiments, this paper provides a more detailed explanation of how to establish a correspondence between the target spline joint and the target connecting disc based on the dynamic balance. For example... Figure 3 As shown, the method includes:

[0069] S301. Measure the dynamic balance of the spline joint and the connecting disc used on the drive shaft.

[0070] S302. Select the target spline joints whose dynamic balance is greater than or equal to the preset dynamic balance, and the target connecting discs whose dynamic balance is greater than or equal to the preset dynamic balance.

[0071] S301-S302 are similar to S201-S202, and will not be described again in this embodiment.

[0072] S303. Mark the phase of the offset point corresponding to the dynamic balance on the target spline joint and the target connecting plate.

[0073] Specifically, for a target spline joint with a dynamic balance amount not less than a preset dynamic balance amount, and a target connecting plate with a dynamic balance amount not less than a preset dynamic balance amount, the phase of the offset point corresponding to the dynamic balance amount can be marked on the target spline joint and the target connecting plate according to the phase information of the measured dynamic balance amount.

[0074] Figure 4 A schematic diagram of the structure of a transmission shaft provided in this application embodiment. Figure 2 .like Figure 4 As shown, the specific position 101 of the dynamic balance of the connecting plate 10 and its phase can be marked on the connecting plate 10; and the specific position 302 of the dynamic balance of the spline joint 30 and its phase can be marked on the spline joint 30.

[0075] S304. Mark the dynamic balance on the target spline joint and the target connecting plate.

[0076] In this embodiment of the application, the correspondence between the target spline connector and the target connecting plate can be established based on the bias phase.

[0077] Specifically, the first step is to mark the specific values ​​of the dynamic balance on the target spline joint and the target connecting plate.

[0078] In one possible implementation, all target spline joints or target connecting discs can be grouped according to the magnitude of their dynamic balance values. For example, dividing the range into 10-gram intervals, for the five target spline joints with dynamic balance values ​​of 50 grams, 53 grams, 58 grams, 64 grams, and 68 grams, the three target spline joints with dynamic balance values ​​of 50 grams, 53 grams, and 58 grams, where the difference in dynamic balance value is within 10 grams, can be grouped into one group, and the two target spline joints with dynamic balance values ​​of 64 grams and 68 grams, where the difference in dynamic balance value is within 10 grams, can be grouped into another group.

[0079] For the six target connecting plates with dynamic balance values ​​of 20g, 25g, 31g, 36g, 38g and 42g respectively, the target connecting plates with dynamic balance values ​​of 20g and 25g, which have a difference of less than 10g, can be grouped into one group. The target connecting plates with dynamic balance values ​​of 31g, 36g and 38g, which have a difference of less than 10g, can be grouped into another group. The target connecting plate with a dynamic balance value of 42g can be grouped into a separate group.

[0080] S305. For each target spline joint, select two target connecting discs corresponding to the target spline joint based on the dynamic balance and eccentricity phase of the target spline joint.

[0081] Specifically, for a target spline connector with a biased phase in the first and / or third quadrant, a target connecting plate with a biased phase in the second and / or fourth quadrant can be selected accordingly; for a target spline connector with a biased phase in the second and / or fourth quadrant, a target connecting plate with a biased phase in the first and / or third quadrant can be selected accordingly.

[0082] Furthermore, the difference between the total dynamic balance of the two target connecting discs and the dynamic balance of the target spline joint is less than or equal to a preset difference threshold. This improves the initial dynamic balance performance of the drive shaft after assembly and reduces abnormal vibrations during operation.

[0083] S306. Assemble the target spline joint and the target connecting disc onto the drive shaft according to the corresponding relationship.

[0084] S305 is similar to S204, and will not be described again in this embodiment.

[0085] This application provides a drive shaft assembly method. By marking the phase of the eccentricity and the magnitude of the dynamic balance on the target spline joint and the target connecting plate, and selecting two target connecting plates corresponding to the target spline joint based on the dynamic balance and eccentricity phase, for target spline joints with eccentricity phases in the first and / or third quadrants, target connecting plates with eccentricity phases in the second and / or fourth quadrants are selected; conversely, for target spline joints with eccentricity phases in the second and / or fourth quadrants, target connecting plates with eccentricity phases in the first and / or third quadrants are selected. By aligning the eccentricity phase of the target spline joint with the eccentricity phase of the target connecting plate at approximately 180 degrees, the dynamic balance between the target spline joint and the target connecting plate is balanced. By ensuring that the difference between the total dynamic balance of the two target connecting plates and the dynamic balance of the target spline joint is less than or equal to a preset difference threshold, the initial dynamic balance performance of the drive shaft after assembly is improved, and abnormal vibration of the drive shaft during operation is reduced.

[0086] Figure 5 A flowchart illustrating a drive shaft assembly method provided in this application embodiment. Figure 3 .like Figure 5 As shown, in this embodiment... Figure 3 Based on the embodiments, the assembly of the spline joint and spline hub is described in detail. Figure 5 As shown, the method includes:

[0087] S501. Measure the internal spline dimensions of the spline hub used on the drive shaft and the external spline dimensions of the target spline joint.

[0088] Specifically, the external splines of a spline connector are usually precision machined, and the spline hub is also usually precision machined. However, after the spline hub is precision machined, it is usually coated with nylon. This coating of nylon causes the internal spline dimensions of the spline hub to change, which may result in a mismatch with the external spline dimensions of the target spline connector.

[0089] Therefore, the internal spline dimensions of the spline hub used on the drive shaft and the external spline dimensions of the target spline joint can be further measured.

[0090] Figure 6 A schematic diagram of the structure of a transmission shaft provided in this application embodiment. Figure 2 .like Figure 6 As shown, the spline joint 30 also has an external spline 303 that is connected to the internal spline of the spline hub 40.

[0091] S502. Determine the fit clearance between the spline hub and the target spline joint based on the difference between the internal spline size and the external spline size.

[0092] Specifically, the difference between the dimensions of the internal spline and the external spline is related to the tooth thickness and tooth groove width of the internal spline, as well as the tooth thickness and tooth groove width of the external spline.

[0093] S503. When the mating clearance is less than or equal to the preset clearance, assemble the splined hub onto the target splined joint.

[0094] Specifically, the preset clearance can be set according to the actual situation, such as 0.2 mm or 0.1 mm, etc., without specific limitations. When the mating clearance between the splined hub and the target splined joint is less than or equal to the preset clearance, the splined hub can be directly assembled onto the target splined joint.

[0095] S504. When the mating clearance is greater than the preset clearance, the machining dimensions of the spline joint are adjusted, and the spline joint machined with the adjusted machining dimensions is assembled with the spline hub.

[0096] Specifically, when the clearance between the spline hub and the target spline joint is greater than the preset clearance, the machining dimensions of the target spline joint can be adjusted, and the external spline of the target spline joint can be further machined using the adjusted machining dimensions. After machining, the spline hub can be assembled onto the target spline joint.

[0097] This application provides a drive shaft assembly method that measures the inner spline dimensions of the spline hub used on the drive shaft and the outer spline dimensions of the target spline joint. Based on the difference between the inner and outer spline dimensions, the fitting clearance between the spline hub and the target spline joint is determined. When the fitting clearance is greater than a preset clearance, the machining dimensions of the target spline joint are adjusted. The target spline joint, machined using the adjusted machining dimensions, is then assembled with the spline hub. By adjusting the machining dimensions of the target spline joint to match the spline hub, waste caused by mismatch between the spline hub and the target spline joint is reduced, thereby saving the production cost of the drive shaft.

[0098] The following is a concrete example illustrating a driveshaft assembly method. First, the dynamic balance of multiple connecting discs and multiple spline joints is measured. Next, one spline joint is selected (e.g., the offset point phase is in the first quadrant, and the dynamic balance value is 54 grams). Then, two connecting discs with offset points in the second or fourth quadrant are selected, and the sum of their dynamic balance values ​​is close to the dynamic balance value of the selected spline joint (e.g., one selected connecting disc with an offset point phase in the second quadrant has a dynamic balance value of 25 grams; the other selected connecting disc also has an offset point phase in the second quadrant, and a dynamic balance value of 31 grams). Finally, based on whether the fit clearance between the spline hub and the selected spline joint is less than or equal to a preset clearance (e.g., 0.2 mm), a suitable spline hub and spline joint are selected for connection. Furthermore, when assembling the connecting disc and the spline joint, the offset points of these two components can be aligned at a 180-degree angle to balance the dynamic balance between the spline joint and the connecting disc. After assembly, the initial dynamic balance value of the drive shaft at the spline joint end is measured to be 18.7 grams, and the initial dynamic balance value at the connecting disc end is 10.2 grams. For this type of drive shaft, if assembled using conventional methods, the average initial dynamic balance value at the spline joint end is typically around 75 grams, and the average initial dynamic balance value at the connecting disc end is typically around 60 grams. Therefore, compared with conventional assembly methods, the drive shaft assembly method in this embodiment can effectively improve the initial dynamic balance performance of the drive shaft.

[0099] This application also provides a drive shaft assembly device, which includes: a measuring unit, a screening unit, a grouping unit, and an assembly unit;

[0100] The measuring unit is used to measure the dynamic balance of the spline joint and the connecting disc on the drive shaft.

[0101] The screening unit is used to screen out target spline joints with dynamic balance values ​​greater than or equal to preset dynamic balance values, as well as target connecting discs with dynamic balance values ​​greater than or equal to preset dynamic balance values. The preset dynamic balance value is positively correlated with the torque of the drive shaft.

[0102] Grouping units are used to establish a correspondence between the target spline joint and the target connecting plate based on the dynamic balance amount;

[0103] The assembly unit is used to assemble the target spline joint and the target connecting disc onto the drive shaft according to the corresponding relationship.

[0104] The aforementioned drive shaft assembly device can be used to implement the aforementioned drive shaft assembly method. Its implementation principle and technical effect are similar, and will not be described again in this embodiment.

[0105] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for assembling a drive shaft, characterized in that, include: Measure the dynamic balance of the spline joint and the connecting disc used on the drive shaft; Select target spline joints whose dynamic balance is greater than or equal to a preset dynamic balance, and target connecting discs whose dynamic balance is greater than or equal to a preset dynamic balance, wherein the preset dynamic balance is positively correlated with the torque of the drive shaft; Establish a correspondence between the target spline joint and the target connecting plate based on the dynamic balance value; According to the correspondence, the target spline joint and the target connecting disc are assembled onto the drive shaft.

2. The method according to claim 1, characterized in that, The step of establishing a correspondence between the target spline joint and the target connecting plate based on the dynamic balance value includes: Mark the phase of the offset point corresponding to the dynamic balance amount on the target spline joint and the target connecting plate; The correspondence between the target spline connector and the target connecting plate is established based on the phase of the bias point.

3. The method according to claim 2, characterized in that, The step of establishing the correspondence between the target spline connector and the target connecting plate based on the bias phase includes: The dynamic balance amount is marked on the target spline joint and the target connecting plate; For each target spline joint, two target connecting discs corresponding to the target spline joint are selected based on the dynamic balance of the target spline joint and the phase of the offset point.

4. The method according to claim 3, characterized in that, The spline joint of the bias phase in the first quadrant and / or the third quadrant corresponds to the connection plate of the bias phase in the second quadrant and / or the fourth quadrant, and the spline joint of the bias phase in the second quadrant and / or the fourth quadrant corresponds to the connection plate of the bias phase in the first quadrant and / or the third quadrant.

5. The method according to claim 3, characterized in that, The difference between the total dynamic balance of the two target connecting discs and the dynamic balance of the target spline joint is less than or equal to a preset difference threshold.

6. The method according to any one of claims 1 to 5, characterized in that, The method further includes: Measure the internal spline dimensions of the spline hub used on the drive shaft and the external spline dimensions of the target spline joint; The fit clearance between the spline hub and the target spline joint is determined based on the difference between the internal spline size and the external spline size. When the fitting clearance is less than or equal to the preset clearance, the spline hub is assembled onto the target spline joint; When the mating clearance is greater than the preset clearance, the machining dimensions of the spline joint are adjusted, and the spline joint machined with the adjusted machining dimensions is assembled with the spline hub.

7. A drive shaft assembly device, characterized in that, include: Measurement unit, screening unit, grouping unit, and assembly unit; The measuring unit is used to measure the dynamic balance of the spline joint and the dynamic balance of the connecting disc on the drive shaft. The screening unit is used to screen out target spline joints whose dynamic balance is greater than or equal to a preset dynamic balance, and target connecting discs whose dynamic balance is greater than or equal to a preset dynamic balance, wherein the preset dynamic balance is positively correlated with the torque of the drive shaft. A grouping unit is used to establish a correspondence between the target spline joint and the target connecting plate based on the dynamic balance amount; An assembly unit is used to assemble the target spline joint and the target connecting disc onto the drive shaft according to the correspondence.

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