Transmission shaft assembling method and device

Abstract

The invention provides a transmission shaft assembling method and device, and relates to the technical field of vehicle transmission shafts. The method comprises the steps that the dynamic balance amount of a spline connector used on a transmission shaft and the dynamic balance amount of a connecting disc are measured; target spline joints with the dynamic balance amount larger than or equal to the preset dynamic balance amount and target connecting discs with the dynamic balance amount larger than or equal to the preset dynamic balance amount are screened out; establishing a corresponding relation between the target spline joint and the target connecting disc according to the dynamic balance amount; and the target spline connector and the target connecting disc are assembled on the transmission shaft according to the corresponding relation. According to the method, the corresponding relation is established between the spline connector and the connecting disc which are large in dynamic balance amount, and the spline connector and the connecting disc are assembled to the transmission shaft according to the corresponding relation, so that on the premise that the production cost of the transmission shaft is not increased, the initial dynamic balance performance of the transmission shaft is effectively improved, and the stability of the transmission shaft is improved; and the running stability and comfort of the vehicle are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle drive shafts, and particularly to a drive shaft assembly method and device. Background Art

[0002] In a vehicle drive system, due to large forging errors, there are usually rough surfaces that have not been finely machined on the spline joints and connection plates of the drive shaft, resulting in the dynamic balance of the spline joints and connection plates usually exceeding the standard value. If the spline joints with dynamic balance greater than the standard value and the connection plates are arbitrarily assembled, it is easy to cause poor initial dynamic balance performance of the drive shaft, thereby increasing abnormal vibration during the operation of the drive shaft and even possibly causing resonance between the drive shaft and the vehicle, further affecting the running smoothness and comfort of the vehicle.

[0003] In the prior art, during the production of the drive shaft, the problem of poor initial dynamic balance performance of the drive shaft caused by the excessive dynamic balance of the spline joint and the connection plate is usually adjusted by welding balance weights on the drive shaft. Or, by improving the production process of the spline joint and the connection plate, the part accuracy of the spline joint and the connection plate is improved, thereby improving the dynamic balance performance of the drive shaft.

[0004] However, welding balance weights on the drive shaft increases the instability of the drive shaft. Although improving the production process of the spline joint and the connection plate can improve the initial dynamic balance performance of the drive shaft, it increases the production cost of the drive shaft. Summary of the Invention

[0005] The present application provides a drive shaft assembly method and device, which are used to establish a corresponding relationship between the spline joint and the connection plate with a large dynamic balance, and assemble the spline joint and the connection plate onto the drive shaft according to the corresponding relationship, so as to effectively improve the initial dynamic balance performance of the drive shaft, improve the stability of the drive shaft, and ensure the running smoothness and comfort of the vehicle without increasing the production cost of the drive shaft.

[0006] In a first aspect, the present application provides a drive shaft assembly method, which includes:

[0007] Measuring the dynamic balance of the spline joint used on the drive shaft and the dynamic balance of the connection plate;

[0008] Selecting target spline joints with a dynamic balance greater than or equal to a preset dynamic balance, and target connection plates with a dynamic balance greater than or equal to the preset dynamic balance, where the preset dynamic balance is positively correlated with the torque of the drive shaft;

[0009] Establishing a corresponding relationship for the target spline joints and the target connection plates according to the dynamic balance;

[0010] Assemble the target spline joint and the target connection disk to the transmission shaft according to the corresponding relationship.

[0011] In a possible design, establishing the corresponding relationship between the target spline joint and the target connection disk according to the dynamic balance amount includes:

[0012] Mark the phase of the unbalance point corresponding to the dynamic balance amount on the target spline joint and the target connection disk;

[0013] Establish the corresponding relationship between the target spline joint and the target connection disk according to the phase of the unbalance point.

[0014] In a possible design, establishing the corresponding relationship between the target spline joint and the target connection disk according to the phase of the unbalance point includes:

[0015] Mark the dynamic balance amount on the target spline joint and the target connection disk;

[0016] For each target spline joint, select two target connection disks corresponding to the target spline joint according to the dynamic balance amount and the phase of the unbalance point of the target spline joint.

[0017] In a possible design, the spline joint with the phase of the unbalance point in the first quadrant and / or the third quadrant corresponds to the connection disk with the phase of the unbalance point in the second quadrant and / or the fourth quadrant, and the spline joint with the phase of the unbalance point in the second quadrant and / or the fourth quadrant corresponds to the connection disk with the phase of the unbalance point in the first quadrant and / or the third quadrant.

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

[0019] In a possible design, the method further includes:

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

[0021] Determine the fit clearance between the spline hub and the target spline joint according to the difference between the internal spline dimension and the external spline dimension;

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

[0023] When the fit clearance is greater than the preset clearance, adjust the machining dimension of the spline joint, and assemble the spline joint machined with the adjusted machining dimension to the spline hub.

[0024] In a second aspect, the present application provides a transmission shaft assembly device, and the device includes: a measurement unit, a screening unit, a grouping unit, and an assembly unit;

[0025] A measuring unit for measuring the dynamic balance of a spline joint used on a transmission shaft and the dynamic balance of a connecting disc.

[0026] A screening unit for screening out target spline joints with a dynamic balance greater than or equal to a preset dynamic balance, and target connecting discs with a dynamic balance greater than or equal to the preset dynamic balance, where the preset dynamic balance is positively correlated with the torque of the transmission shaft.

[0027] A grouping unit for establishing a corresponding relationship between the target spline joints and the target connecting discs according to the dynamic balance.

[0028] An assembling unit for assembling the target spline joints and the target connecting discs onto the transmission shaft according to the corresponding relationship.

[0029] A transmission shaft assembling method and device provided by the present application. The method includes: First, measuring the dynamic balance of a spline joint used on the transmission shaft and the dynamic balance of the connecting disc; Then, screening out target spline joints with a dynamic balance greater than or equal to the preset dynamic balance, and target connecting discs with a dynamic balance greater than or equal to the preset dynamic balance, where the preset dynamic balance is positively correlated with the torque of the transmission shaft; Then, establishing a corresponding relationship between the target spline joints and the target connecting discs according to the dynamic balance; Finally, assembling the target spline joints and the target connecting discs onto the transmission shaft according to the corresponding relationship. The following technical effects are achieved: By measuring the dynamic balance of the spline joint and the connecting disc, then screening out target spline joints with a dynamic balance not less than the preset dynamic balance, and target connecting discs with a dynamic balance not less than the preset dynamic balance, and establishing a corresponding relationship between the target spline joints and the target connecting discs according to the dynamic balance, so as to accurately assemble the target spline joints and the target connecting discs onto the transmission shaft according to the corresponding relationship. Thus, there is no need to improve the production process of the spline joint and the connecting disc, nor to add additional components, realizing the effective solution of the problem of poor initial dynamic balance performance of the transmission shaft caused by excessive dynamic balance of the spline joint and excessive dynamic balance of the connecting disc without increasing the production cost of the transmission shaft, reducing the abnormal vibration of the transmission shaft during vehicle operation, thereby improving the stability of the transmission shaft, the running smoothness and comfort of the vehicle, and enhancing the driving safety; For spline joints with a dynamic balance less than the preset dynamic balance and connecting discs with a dynamic balance less than the preset dynamic balance, they are directly assembled onto the transmission shaft according to the installation process in the prior art, avoiding unnecessary redundant operations on the premise of ensuring the initial dynamic balance performance of the transmission shaft; By using an existing dynamic balancing machine to accurately measure the dynamic balance and the center of gravity position of the spline joint, as well as the dynamic balance and the center of gravity position of the connecting disc, the problem of how to measure the dynamic balance of the spline joint and the connecting disc is solved. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0031] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with this application, and are used together with the specification to explain the principles of this application.

[0032] Figure 1 Structural schematic of a drive shaft provided for an embodiment of this application Figure 1 ;

[0033] Figure 2 Flow schematic of a drive shaft assembly method provided for an embodiment of this application Figure 1 ;

[0034] Figure 3 Flow schematic of a drive shaft assembly method provided for an embodiment of this application Figure 2 ;

[0035] Figure 4 Structural schematic of a drive shaft provided for an embodiment of this application Figure 2 ;

[0036] Figure 5 Flow schematic of a drive shaft assembly method provided for an embodiment of this application Figure 3 ;

[0037] Figure 6 Structural schematic of a drive shaft provided for an embodiment of this application Figure 2 。

[0038] Reference numerals:

[0039] 10 - connecting plate; 20 - universal joint; 30 - spline joint; 40 - spline hub; 50 - shaft tube; 60 - universal joint fork; 301 - sheath; 101 - specific position of the dynamic balance of the connecting plate; 302 - specific position of the dynamic balance of the spline joint; 303 - external spline. Detailed implementation manners

[0040] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with this application. Instead, they are only examples of the devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0041] In the embodiments of the present application, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and effects. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and "first", "second", etc. do not necessarily mean different. It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner. In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more.

[0042] It should be noted that "when...", in the embodiments of the present application, can be at the instant when a certain situation occurs, or within a period of time after a certain situation occurs. The embodiments of the present application do not make specific limitations on this. In addition, a drive shaft assembly method provided in the embodiments of the present application is only an example, and a drive shaft assembly method may also include more or less content.

[0043] For the convenience of clearly describing the technical solutions of the embodiments of the present application, the following briefly introduces some terms and technologies involved in the embodiments of the present application:

[0044] Dynamic balance amount: Also known as unbalance amount, it is a physical quantity used to describe the balance state of a rotating object during rotation, which reflects the degree of deviation of the object from the balanced state. Usually, in rotating machinery, in order to reduce the unbalanced force and vibration caused by the uneven mass distribution of the rotating object, when performing balance correction on the rotating object, the mass parameter that needs to be adjusted.

[0045] With the development of commercial vehicles, the running smoothness and comfort of vehicles have received more and more attention. As an important transmission component in the vehicle transmission system, the drive shaft plays the role of transmitting the power generated by the engine to the drive axle. And the drive shaft has the working characteristics of a relatively long length and high-speed rotation during operation. Therefore, when the drive shaft vibrates abnormally by itself or resonates with the vehicle, it has a greater impact on the running smoothness and comfort of the vehicle. Therefore, improving the dynamic balance performance of the drive shaft can effectively reduce the abnormal vibration of the drive shaft itself, reduce the possibility of resonance between the drive shaft and the vehicle, thereby extending the service life of the drive shaft and improving the driving safety of the vehicle.

[0046] In a vehicle drive shaft, the spline joint and the coupling disc usually have rough surfaces that are not finely processed, and there are large forging errors in these rough surfaces, resulting in the dynamic balance of the spline joint and the coupling disc usually exceeding the standard value. If the spline joint and the coupling disc with excessive dynamic balance are randomly assembled together, it is likely to lead to poor initial dynamic balance performance of the drive shaft, thereby increasing abnormal vibration during the operation of the drive shaft, and even potentially causing resonance between the drive shaft and the vehicle, affecting the running smoothness and comfort of the vehicle.

[0047] In the prior art, to solve this technical problem, mainly two methods are adopted: one is to weld balance weights on the drive shaft to adjust its dynamic balance performance; the other is to improve the initial dynamic balance performance of the drive shaft by enhancing the production process precision of the spline joint and the coupling disc.

[0048] However, when the dynamic balance of the spline joint or the coupling disc is too large, the method of welding balance weights on the drive shaft usually cannot effectively improve the initial dynamic balance performance of the drive shaft. Moreover, the welded balance weights increase the structural complexity of the drive shaft and there is a possibility of falling off, which will increase the potential instability of the drive shaft. And by the method of improving the production process of the spline joint and the coupling disc, although it can improve the initial dynamic balance performance of the drive shaft, it increases the production cost of the drive shaft.

[0049] Based on this, the embodiments of the present application propose a drive shaft assembly method and device, which can be used in the technical field of vehicle drive shafts, aiming to solve the above technical problems in the prior art. By establishing a corresponding relationship between the spline joint with a large dynamic balance and the coupling disc with a large dynamic balance, and accurately assembling them onto the drive shaft according to this corresponding relationship. Thus, there is no need to put forward higher requirements for the production process of the spline joint and the coupling disc, nor to add additional components. That is, without increasing the production cost of the drive shaft, it effectively solves the problem of poor initial dynamic balance performance of the drive shaft caused by the excessive dynamic balance of the spline joint and the coupling disc, reduces the abnormal vibration of the drive shaft during vehicle operation, and further improves the stability of the drive shaft, the running smoothness and comfort of the vehicle, and enhances the driving safety.

[0050] The following uses specific embodiments to elaborate in detail on the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems. These several specific embodiments below can be combined with each other, and for the same or similar concepts or processes, they may not be repeated in some embodiments. The following will describe the embodiments of the present application with reference to the drawings.

[0051] Figure 1 The structural schematic diagram of a drive shaft provided by an embodiment of the present application Figure 1 . To facilitate understanding of the assembly process of each component of the drive shaft, the internal structure, and the positions, connection methods, and correlation relationships between the components in the embodiments of the present application, inFigure 1 The structural explosion diagram of the transmission shaft is given in

[0052] As Figure 1 shown, the transmission shaft includes: a connection disk 10, a universal joint 20, a spline joint 30, a spline hub 40, a shaft tube 50, and a universal joint fork 60.

[0053] Among them, the spline joint 30 includes a sheath 301. The connection disk 10 and the universal joint 20 are both located at the two ends of the transmission shaft, and the connection disk 10 is located at the outermost end of the transmission shaft. The connection disk 10 can be connected to the spline joint 30 or the universal joint fork 60 through the universal joint 20. The spline joint 30 can be connected to one end of the shaft tube 50 of the transmission shaft through the spline hub 40, and the other end of the shaft tube 50 is connected to the universal joint fork 60.

[0054] The technical solution of the present application will be described in detail below in conjunction with specific embodiments.

[0055] Figure 2 The flow chart of a transmission shaft assembly method provided by an embodiment of the present application Figure 1 . This method can be applied to assemble the transmission shaft shown in Figure 1 , as Figure 2 shown, this method includes:

[0056] S201. Measure the dynamic balance of the spline joint used on the transmission shaft and the dynamic balance of the connection disk.

[0057] Specifically, an existing dynamic balancing machine can be used to accurately measure the dynamic balance of the spline joint and its center of gravity position, as well as the dynamic balance of the connection disk and its center of gravity position. Specifically, first, the spline joint or the connection disk is respectively installed on the dynamic balancing machine to ensure firm and centered installation to avoid the influence of installation errors on the accuracy of the measurement results; then, according to the size and mass of the workpiece, the parameters of the dynamic balancing machine are set, such as rotation speed, test time, and sensitivity, etc.; then, the dynamic balancing machine is started to make the spline joint or the connection disk rotate at the set rotation speed. Thus, the vibration condition of the spline joint or the connection disk is measured to obtain the magnitude and phase information of the dynamic balance of the spline joint or the connection disk. Among them, the phase information is used to indicate the specific position of the dynamic balance on the spline joint, or to indicate the specific position of the dynamic balance on the connection disk.

[0058] In addition, in addition to using a dynamic balancing machine to measure the dynamic balance of the spline joint or the connection disk, other methods can also be used for dynamic balance detection, such as vibration analysis method, current detection method, etc. There is no specific limitation here, and a suitable detection method can be selected according to the actual situation.

[0059] S202. Select target spline joints with a dynamic balance greater than or equal to a preset dynamic balance, and target connection plates with a dynamic balance greater than or equal to the preset dynamic balance.

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

[0061] For spline joints with a dynamic balance less than the preset dynamic balance and connection plates with a dynamic balance less than the preset dynamic balance, they can be directly assembled onto the transmission shaft according to the installation process in the prior art.

[0062] S203. Establish a corresponding relationship for the target spline joints and target connection plates based on the dynamic balance.

[0063] Specifically, for the selected target spline joints with a dynamic balance not less than the preset dynamic balance and target connection plates with a dynamic balance not less than the preset dynamic balance, a corresponding relationship can be established based on the measured dynamic balance. For example, establish a corresponding relationship according to the magnitude of the dynamic balance; or establish a corresponding relationship based on the magnitude and phase information of the dynamic balance, etc.

[0064] S204. Assemble the target spline joints and target connection plates onto the transmission shaft according to the corresponding relationship.

[0065] Specifically, after determining the corresponding relationship between the target spline joints and target connection plates, the target spline joints and target connection plates can be assembled onto the transmission shaft according to this corresponding relationship to balance the initial dynamic balance performance of the transmission shaft.

[0066] A transmission shaft assembly method provided in this embodiment includes: First, measure the dynamic balance of the spline joints used on the transmission shaft and the dynamic balance of the connection plates; Next, select target spline joints with a dynamic balance greater than or equal to a preset dynamic balance, and target connection plates with a dynamic balance greater than or equal to the preset dynamic balance, where the preset dynamic balance is positively correlated with the torque of the transmission shaft; Then, establish a corresponding relationship for the target spline joints and target connection plates based on the dynamic balance; Finally, assemble the target spline joints and target connection plates onto the transmission shaft according to the corresponding relationship.

[0067] The following technical effects are achieved: By measuring the dynamic balance of the spline joint and the dynamic balance of the connecting disk, then screening out the target spline joint with a dynamic balance not less than the preset dynamic balance, and the target connecting disk with a dynamic balance not less than the preset dynamic balance, and establishing a corresponding relationship between the target spline joint and the target connecting disk according to the dynamic balance, so as to accurately assemble the target spline joint and the target connecting disk onto the transmission shaft according to the corresponding relationship. Thus, there is no need to improve the production process of the spline joint and the connecting disk, nor to add additional components, achieving the effective solution of the problem of poor initial dynamic balance performance of the transmission shaft caused by the excessive dynamic balance of the spline joint and the excessive dynamic balance of the connecting disk without increasing the production cost of the transmission shaft, reducing the abnormal vibration of the transmission shaft during vehicle operation, thereby improving the stability of the transmission shaft and the running smoothness and comfort of the vehicle, and enhancing the driving safety; for the spline joint with a dynamic balance less than the preset dynamic balance and the connecting disk with a dynamic balance less than the preset dynamic balance, they are directly assembled onto the transmission shaft according to the installation process in the prior art, avoiding unnecessary redundant operations on the premise of ensuring the initial dynamic balance performance of the transmission shaft; by using the existing dynamic balancing machine to accurately measure the dynamic balance and the center of gravity position of the spline joint, as well as the dynamic balance and the center of gravity position of the connecting disk, the problem of how to measure the dynamic balance of the spline joint and the dynamic balance of the connecting disk is solved.

[0068] Figure 3 Flow schematic of a transmission shaft assembly method provided by an embodiment of the present application Figure 2 As Figure 3 shown, on the basis of the Figure 2 embodiment, a further detailed description is made on how to establish a corresponding relationship between the target spline joint and the target connecting disk according to the dynamic balance. As Figure 3 shown, the method includes:

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

[0070] S302. Screen out the target spline joint with a dynamic balance greater than or equal to the preset dynamic balance, and the target connecting disk with a dynamic balance greater than or equal to the preset dynamic balance.

[0071] S301 - S302 is similar to S201 - S202, and will not be elaborated in this embodiment.

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

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

[0074] Figure 4 Structural schematic of a drive shaft provided by an embodiment of the present application Figure 2 As Figure 4 shown, the specific position 101 of the dynamic balance amount of the connecting disk and its corresponding phase can be marked on the connecting disk 10; and the specific position 302 of the dynamic balance amount of the spline joint and its corresponding phase can be marked on the spline joint 30.

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

[0076] In the embodiment of the present application, the corresponding relationship between the target spline joint and the target connecting disk can be established according to the phase points of the overweight points.

[0077] Specifically, first, the specific numerical value of the dynamic balance amount can also be marked on the target spline joint and the target connecting disk.

[0078] In a possible implementation manner, all target spline joints or all target connecting disks can be grouped according to the numerical value of the dynamic balance amount. For example, divided by a unit interval of 10 grams, for the five target spline joints with dynamic balance amounts of 50 grams, 53 grams, 58 grams, 64 grams, and 68 grams respectively, the three target spline joints with dynamic balance amounts of 50 grams, 53 grams, and 58 grams and a difference within 10 grams can be divided into one group, and the two target spline joints with dynamic balance amounts of 64 grams and 68 grams and a difference within 10 grams can be divided into one group.

[0079] For the six target connecting disks with dynamic balance amounts of 20 grams, 25 grams, 31 grams, 36 grams, 38 grams, and 42 grams respectively, the two target connecting disks with dynamic balance amounts of 20 grams and 25 grams and a difference within 10 grams can be divided into one group, the three target connecting disks with dynamic balance amounts of 31 grams, 36 grams, and 38 grams and a difference within 10 grams can be divided into one group, and the target connecting disk with 42 grams can be separately divided into one group.

[0080] S305. For each target spline joint, select two target connecting disks corresponding to the target spline joint according to the dynamic balance amount and the phase points of the overweight points of the target spline joint.

[0081] Specifically, for a target spline joint with a focus phase in the first quadrant and / or the third quadrant, a target connecting disk with a focus phase in the second quadrant and / or the fourth quadrant can be correspondingly selected; for a target spline joint with a focus phase in the second quadrant and / or the fourth quadrant, a target connecting disk with a focus phase in the first quadrant and / or the third quadrant can be correspondingly selected.

[0082] Further, the difference between the total dynamic balance of the two target connecting disks and the dynamic balance of the target spline joint is less than or equal to a preset difference threshold. Thereby, the initial dynamic balance performance of the drive shaft after assembly can be improved, and abnormal vibration during the operation of the drive shaft can be reduced.

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

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

[0085] A drive shaft assembly method provided by an embodiment of the present application marks the focus phase corresponding to the dynamic balance and the numerical value of the dynamic balance on the target spline joint and the target connecting disk, and selects two target connecting disks corresponding to the target spline joint according to the dynamic balance and the focus phase of the target spline joint. For a target spline joint with a focus phase in the first quadrant and / or the third quadrant, a target connecting disk with a focus phase in the second quadrant and / or the fourth quadrant is correspondingly selected; for a target spline joint with a focus phase in the second quadrant and / or the fourth quadrant, a target connecting disk with a focus phase in the first quadrant and / or the third quadrant is correspondingly selected. By making the focus phase of the target spline joint and the focus phase of the target connecting disk form an angle close to 180 degrees correspondingly, the dynamic balance between the target spline joint and the target connecting disk is balanced. By making the difference between the total dynamic balance of the two target connecting disks and the dynamic balance of the target spline joint 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 during the operation of the drive shaft is reduced.

[0086] Figure 5 It is a flow schematic of a drive shaft assembly method provided by an embodiment of the present application Figure 3 As Figure 5 shown, on the basis of the Figure 3 embodiment, how to assemble the spline joint and the spline hub is described in detail. As Figure 5 shown, the method includes:

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

[0088] Specifically, the external splines of the spline joint are usually finish-machined, and the spline hub is usually also finish-machined. However, after the spline hub is finish-machined, nylon is usually coated on it, resulting in changes in the internal spline dimensions of the spline hub after coating, which may cause matching errors with the external spline dimensions of the corresponding target spline joint.

[0089] Therefore, it is possible to further measure the internal spline dimensions of the spline hub used on the drive shaft and the external spline dimensions of the target spline joint.

[0090] Figure 6 Structural schematic of a drive shaft provided by an embodiment of the present application Figure 2 As Figure 6 shown, the spline joint 30 also has an external spline 303 that is correspondingly 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 according to the difference between the internal spline dimensions and the external spline dimensions.

[0092] Specifically, the difference between the internal spline dimensions and the external spline dimensions is specifically also 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 fit clearance is less than or equal to the preset clearance, assemble the spline hub onto the target spline joint.

[0094] Specifically, the preset clearance can be set according to the actual situation, and can be specifically set to 0.2 mm or 0.1 mm, etc., without specific limitation here. When the fit clearance between the spline hub and the target spline joint is less than or equal to the preset clearance, the spline hub can be directly assembled onto the target spline joint.

[0095] S504. When the fit clearance is greater than the preset clearance, adjust the machining dimensions of the spline joint, and assemble the spline hub with the spline joint machined with the adjusted machining dimensions.

[0096] Specifically, when the fit 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 with the adjusted machining dimensions, and after the machining is completed, the spline hub can be assembled onto the target spline joint.

[0097] A drive shaft assembly method provided by an embodiment of the present application measures the internal spline dimensions of a spline hub used on a drive shaft and the external spline dimensions of a target spline joint, determines the fit clearance between the spline hub and the target spline joint according to the difference between the internal spline dimensions and the external spline dimensions, adjusts the machining dimensions of the target spline joint when the fit clearance is greater than a preset clearance, and assembles the target spline joint machined with the adjusted machining dimensions with the spline hub, so as to match it with the spline hub by adjusting the machining dimensions of the target spline joint, reducing the waste caused by the mismatch between the spline hub and the target spline joint, and thus saving the production cost of the drive shaft.

[0098] Next, a specific example is used to illustrate a drive shaft assembly method. First, for a plurality of connecting plates and a plurality of spline joints, the dynamic balance amounts are measured respectively. Then, a spline joint is selected therefrom (for example, the phase of the unbalanced point is in the first quadrant, and the specific numerical value of the dynamic balance amount is 54 grams). Then, two connecting plates with the phases of the unbalanced points both in the second quadrant or the fourth quadrant are selected, and the sum of the numerical values of the dynamic balance amounts of these two connecting plates is close to the numerical value of the dynamic balance amount of the selected spline joint (for example, the phase of the unbalanced point of one of the selected connecting plates is in the second quadrant, and the specific numerical value of the dynamic balance amount is 25 grams; the phase of the unbalanced point of the other selected connecting plate is also in the second quadrant, and the specific numerical value of the dynamic balance amount is 31 grams). Furthermore, taking whether the fit clearance between the spline hub and the selected spline joint is less than or equal to a preset clearance (for example, 0.2 mm) as a judgment criterion, a spline hub and a spline joint that meet the requirements are selected for connection. In addition, when the connecting plate and the spline joint are assembled, the phases of the unbalanced points of these two components can be made to correspond to an included angle of 180 degrees to balance the dynamic balance amount between the spline joint and the connecting plate. After the assembly is completed, the initial dynamic balance value of the drive shaft at the spline joint end can be measured to be 18.7 grams, and the initial dynamic balance value of the drive shaft at the connecting plate end is 10.2 grams. For this type of drive shaft, if the traditional assembly method is used for assembly, the average value of the initial dynamic balance value of this type of drive shaft at the spline joint end is usually about 75 grams, and the average value of the initial dynamic balance value of this type of drive shaft at the connecting plate end is usually about 60 grams. Therefore, compared with the traditional assembly method, the drive shaft assembly method in the embodiment of the present application can effectively improve the initial dynamic balance performance of the drive shaft.

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

[0100] The measurement unit is used to measure the dynamic balance amount of the spline joint used on the drive shaft and the dynamic balance amount of the connecting plate;

[0101] A screening unit for screening target spline joints with a dynamic balance greater than or equal to a preset dynamic balance, and target connection discs with a dynamic balance greater than or equal to the preset dynamic balance, where the preset dynamic balance is positively correlated with the torque of the transmission shaft;

[0102] A grouping unit for establishing a corresponding relationship between the target spline joints and the target connection discs according to the dynamic balance;

[0103] An assembly unit for assembling the target spline joints and the target connection discs onto the transmission shaft according to the corresponding relationship.

[0104] The foregoing transmission shaft assembly device can be used to implement the foregoing transmission shaft assembly method, and its implementation principle and technical effects are similar, which will not be elaborated here in this embodiment.

[0105] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A transmission shaft assembly method, characterized in that: include: Measure the dynamic balance of the spline joints and the dynamic balance of the connecting discs used on the transmission shaft; Screening out a target spline joint whose dynamic balance is greater than or equal to a preset dynamic balance, and a target connecting disk 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 transmission shaft; Establishing a corresponding relationship between the target spline joint and the target connection disk according to the dynamic balancing amount; The target spline joint and the target connecting plate are assembled onto the transmission shaft according to the corresponding relationship.

2. The method according to claim 1, characterized in that The establishing a corresponding relationship between the target spline joint and the target connection disk according to the dynamic balancing amount includes: Marking the eccentric point phase corresponding to the dynamic balancing amount on the target spline joint and the target connection plate; A corresponding relationship between the target spline joint and the target connection disk is established according to the eccentric point phase.

3. The method according to claim 2, characterized in that The establishing of a corresponding relationship between the target spline joint and the target connection disk according to the eccentric point phase includes: marking the dynamic balancing amount on the target spline joint and the target connection plate; For each of the target spline joints, two target connecting plates corresponding to the target spline joint are selected according to the dynamic balance amount of the target spline joint and the eccentric point phase.

4. The method according to claim 3, characterized in that The spline joint with the eccentric point phase in the first quadrant and / or the third quadrant corresponds to the connecting disk with the eccentric point phase in the second quadrant and / or the fourth quadrant, and the spline joint with the eccentric point phase in the second quadrant and / or the fourth quadrant corresponds to the connecting disk with the eccentric point phase in the first quadrant and / or the third quadrant.

5. The method according to claim 3, characterized in that: A difference between a total dynamic balance of the two target connection plates and a 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 comprises: Measuring the internal spline size of the spline hub used on the transmission shaft and the external spline size of the target spline joint; Determining the fit clearance between the spline hub and the target spline joint according to 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, assembling the spline hub onto the target spline joint; When the fitting clearance is larger than the preset clearance, the processing size of the spline joint is adjusted, and the spline joint processed with the adjusted processing size is assembled with the spline hub.

7. A transmission shaft assembly device, characterized in that: include: Measuring units, screening units, grouping units and assembly units; The measuring unit is used to measure the dynamic balance of the spline joint and the dynamic balance of the connecting plate used on the transmission shaft; The screening unit is used to screen out a target spline joint whose dynamic balance is greater than or equal to a preset dynamic balance, and a target connecting disk 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 transmission shaft; A grouping unit, used for establishing a corresponding relationship between the target spline joint and the target connection plate according to the dynamic balancing amount; An assembling unit is used to assemble the target spline joint and the target connecting disk onto the transmission shaft according to the corresponding relationship.

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