Drive shaft tripod universal joint assembly method and assembly system

Abstract

The present invention relates to the technical field of automobile drive shafts, and specifically to an assembly method and assembly system for a drive shaft tripod joint. The method comprises: setting a unit value based on the width tolerance of the drive shaft tripod joint; obtaining a first assembly condition between the bell housing slideway and the ball ring, a second assembly condition between the ball ring and the tripod, and a third assembly condition between the slideway, the ball ring, and the tripod of the drive shaft tripod joint based on the unit value; obtaining an assembly angle range of the difference between the bell housing indexing angle and the tripod indexing angle based on the unit value; and obtaining the assembly dimensions of the drive shaft tripod joint based on the first assembly condition, the second assembly condition, the third assembly condition, and the assembly angle range. The drive shaft tripod joint assembly method of the present application can optimize the design and assembly of the drive shaft tripod joint, control the circumferential clearance and axial play of the drive shaft, and improve the problem of NVH performance degradation caused by drive shaft vibration.

Description

Technical Field

[0001] The invention relates to the technical field of automobile drive shafts, in particular to an assembly method and an assembly system for a drive shaft tripod universal joint. Background Art

[0002] The drive shaft is an important component of the automobile transmission system. When the drive shaft is in use, it will vibrate, causing vehicle NVH problems. This situation frequently occurs in the automobile power transmission system. At present, in order to solve the vehicle NVH performance problem caused by the drive shaft, there is an existing technology that proposes a constant-speed drive shaft for automobiles. This solution mainly limits the length of the left and right half-shafts. The left half-shaft is a solid rod shaft structure, the length of the right half-shaft hollow shaft tube is X, and the length of the left half-shaft solid rod shaft is Y, X>Y, the torsional stiffness of the right half-shaft is Kright, and the torsional stiffness of the left half-shaft is Kleft, Kright=Kleft. This solution mainly solves the problem of the vehicle running off the track during acceleration due to the inconsistent torsional angles of the left and right half-shafts. By limiting the length of the left and right half-shafts, the resonance phenomenon caused by different engine speed conditions is eliminated, thereby improving the NVH performance and economic performance of the vehicle.

[0003] However, in actual application, it was found that the NVH performance problem caused by the drive shaft vibration still exists. This shows that the NVH problem caused by the drive shaft vibration is not only due to the inconsistent torsion angles of the left and right half-shafts of the drive shaft, but there are other factors.

[0004] like Figure 1 As shown, the drive shaft includes an intermediate shaft, one end of which is provided with a constant velocity universal joint connected to the wheel hub side, and the other end is provided with a tripod universal joint connected to the differential. Figure 1 As shown, the bell housing 1 comprises a hollow shell structure with one end open. A tripod 2 is mounted within the bell housing 1. The tripod 2 is a cylindrical body with three cylindrical pins arranged equidistantly along the circumference of the body. A ball ring 3 is mounted on the pins. The ball ring 3 is an annular structure connected to the pins and can rotate about the pin axis. An arc-shaped slideway is provided on the inside of the bell housing 1. The ball ring 3 is mounted on the tripod 2 and assembled into the bell housing 1 together with the tripod 2. The ball ring 3 fits in the slideway.

[0005] By analyzing the drive shaft vibration phenomenon in combination with the drive shaft structure, it was found that the main reason for this phenomenon is the problem of the size and assembly of the tripod universal joint in the drive shaft. When assembling the drive shaft, the ball ring, the slideway and the tripod need to be clearance-matched, and the gap between the ball ring and the slideway cannot be too large. Inappropriate dimensions will affect the circumferential clearance and axial movement of the drive shaft, further affecting the axial derivative force, and ultimately leading to a significant reduction in the NVH performance of the drive shaft. At present, the assembly dimensions of most drive shafts are determined by empirical values ​​in the early stage of design. There is no definite method to limit the circumferential clearance. This leads to deviations in the assembly dimensions of the ball ring, slideway and tripod on many drive shafts. Finally, the assembled drive shaft vibrates during use, causing more serious NVH problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a drive shaft tripod universal joint assembly method and assembly system.

[0007] The technical solution of the present invention is: a method for assembling a driving shaft tripod universal joint, comprising:

[0008] Set the unit value based on the width tolerance of the drive shaft tripod joint;

[0009] Obtaining, based on the unit value, a first assembly condition between a bell housing slideway and a ball ring, a second assembly condition between the ball ring and the tripod, and a third assembly condition between the slideway, the ball ring, and the tripod of the drive shaft tripod universal joint;

[0010] Get the assembly angle range of the bell housing and the tripod pin based on the unit value;

[0011] The drive shaft tripod universal joint is assembled based on the first assembly condition, the second assembly condition, the third assembly condition and the assembly angle range.

[0012] According to a drive shaft tripod universal joint assembly method provided in the present application, the method for setting a unit value based on the width tolerance of the drive shaft tripod universal joint includes: using a setting value for distinguishing the width tolerance size gear of the drive shaft tripod universal joint as the unit value.

[0013] According to a drive shaft tripod universal joint assembly method provided in the present application, the method for obtaining the first assembly condition between the bell housing slide and the ball ring, the second assembly condition between the ball ring and the tripod, and the third assembly condition between the slide, the ball ring and the tripod of the drive shaft tripod universal joint based on the unit value includes: the first assembly condition refers to the first difference between the width of the bell housing slide and the corresponding ball ring outer diameter width being between 0 and the unit value; the second assembly condition refers to the second difference between the width of the ball ring inner diameter and the width of the corresponding tripod being between 0 and the unit value; the third assembly condition refers to the sum of the first difference and the second difference being between 0 and the unit value.

[0014] According to a drive shaft tripod universal joint assembly method provided in the present application, the method for obtaining the assembly angle range of the bell housing and the tripod based on the unit value includes: constructing a limit state with one side of the ball ring tightly attached to the corresponding slide side wall and the other side with the slide gap as the unit value, and the difference between the angle between the line between the end point of the slide on the gap side and the drive shaft axis and the tripod axis in the corresponding slide in the limit state and the angle between the line between the end point of the ball ring on the gap side in the slide and the drive shaft axis and the tripod axis in the corresponding slide is the maximum assembly angle value, and the assembly angle range is 0 to the maximum assembly angle value.

[0015] According to a drive shaft tripod universal joint assembly method provided in the present application, the angle between the center line of the bell housing slideway and the axis of the tripod in the slideway on the same axial section is within the assembly angle range.

[0016] According to a drive shaft tripod universal joint assembly method provided in this application, the maximum assembly angle value is calculated according to the following formula:

[0017]

[0018] Where: α——second angle;

[0019] β——first angle;

[0020] θ0——maximum assembly angle value;

[0021] L4 - outer diameter of the ball ring;

[0022] n——unit value;

[0023] R - the distance between the center of the ball ring and the axis of the drive shaft.

[0024] The present application also provides a drive shaft tripod universal joint assembly system, which operates according to the above drive shaft tripod universal joint assembly method, including:

[0025] a unit value determining module, the unit value determining module setting the unit value based on a width tolerance of a tripod universal joint of the drive shaft;

[0026] an assembly clearance condition acquisition module, the assembly clearance condition acquisition module acquiring, based on the unit value, a first assembly condition between the bell housing slideway and the ball ring, a second assembly condition between the ball ring and the tripod, and a third assembly condition between the slideway, the ball ring, and the tripod of the drive shaft tripod universal joint;

[0027] an assembly angle condition acquisition module, the assembly angle condition acquisition module acquiring an assembly angle range of the bell housing and the tripod pin based on a unit value;

[0028] An assembly optimization module is provided for assembling the driving shaft tripod universal joint based on the first assembly condition, the second assembly condition, the third assembly condition and the assembly angle range.

[0029] According to a drive shaft tripod universal joint assembly system provided by the present application, the unit value determination module uses a set value for distinguishing width tolerance size gears of the drive shaft tripod universal joint as the unit value.

[0030] According to a drive shaft tripod universal joint assembly system provided by the present application, the assembly clearance condition acquisition module includes:

[0031] a first assembly condition acquisition module, which determines a first assembly condition according to a requirement that a first difference between a bell housing slideway width and an outer diameter width of a corresponding ball ring is between 0 and unity;

[0032] a second assembly condition acquisition module, the second assembly condition acquisition module determining a second assembly condition according to a requirement that a second difference between the inner diameter width of the ball ring and the width of the corresponding tripod pin is between 0 and unity;

[0033] The third assembly condition acquisition module determines the third assembly condition according to the requirement that the sum of the first difference and the second difference is between 0 and unity.

[0034] According to a drive shaft tripod universal joint assembly system provided by the present application, the assembly angle condition acquisition module includes:

[0035] A limit state construction module, wherein the limit state construction module constructs a limit state with a gap between one side of the ball ring and the corresponding slideway side wall being in close contact with the other side of the ball ring and the slideway as a unit value;

[0036] A first angle acquisition module, wherein the first angle acquisition module uses the angle between the line between the end point of the clearance side slideway and the axis of the drive shaft in the limit state and the axis of the tripod in the corresponding slideway as the first angle;

[0037] A second angle acquisition module, wherein the second angle acquisition module uses the angle between the line between the corresponding side end point of the ball ring in the slideway and the axis of the drive shaft in the limit state and the axis of the tripod in the corresponding slideway as the second angle;

[0038] a maximum assembly angle value acquisition module, wherein the maximum assembly angle value acquisition module uses the difference between the first angle and the second angle as the maximum assembly angle;

[0039] The assembly angle range acquisition module uses 0 to the maximum assembly angle value as the assembly angle range.

[0040] According to a drive shaft tripod universal joint assembly system provided by the present application, the assembly optimization module includes:

[0041] An assembly angle optimization module is assembled in such a way that the angle between the center line of the bell housing slideway and the axis of the tripod in the slideway on the same axial section is within an assembly angle range.

[0042] According to a drive shaft tripod universal joint assembly system provided by the present application, the maximum assembly angle value acquisition module calculates the maximum assembly angle value according to the following formula:

[0043]

[0044] Where: α——second angle;

[0045] β——first angle;

[0046] θ0——maximum assembly angle value;

[0047] L4 - outer diameter of the ball ring;

[0048] n——unit value;

[0049] R - the distance between the center of the ball ring and the axis of the drive shaft.

[0050] The advantages of this application are as follows: 1. This application establishes a unit value based on the width tolerance of the tripod universal joint of the drive shaft. By analyzing the structure of the tripod universal joint, the assembly relationship of the various components of the tripod universal joint that may cause abnormal noise during the vibration of the drive shaft is established based on the unit value, and the limit is set. This ensures that the assembly between the bell housing, ball ring and tripod, which are most likely to affect the NVH performance, is within an appropriate range. This eliminates the noise problem caused by large component shaking due to excessive clearance, effectively reduces the periodic axial force caused by friction, effectively controls the circumferential clearance and axial play of the drive shaft, and improves the problem of NVH performance degradation caused by drive shaft vibration.

[0051] 2. This application determines the unit value based on the setting value of the width tolerance size gear of the drive shaft tripod universal joint. The unit value is closely related to the assembly requirements of the drive shaft tripod universal joint. The unit value determined in this way is based on a basis and is not generated out of thin air or based on personal experience. Its acquisition method is more scientific and reasonable, and can guide the subsequent design optimization of assembly dimensions.

[0052] 3. The method of constructing the first, second, and third assembly conditions in this application is very simple. By determining the above three assembly conditions, the gap widths between the bell housing slideway, the ball ring, and the tripod pin can be effectively determined, and appropriate components can be selected to achieve a tight fit between the three, facilitating subsequent assembly operations.

[0053] 4. This application determines the maximum allowable assembly angle by using the limit state constructed with the ball ring. This method can obtain the maximum assembly angle value, which can quickly determine the assembly angle relationship between the tripod and the bell housing, so that the tripod is as close to the middle of the slide as possible. This avoids collision and friction caused by uneven clearance between the ball ring and the two sides of the slide, or excessive clearance on one side and insufficient clearance on the other side. The method for determining the assembly angle range is very simple.

[0054] 5. The present invention provides a very simple method for optimizing the assembly angle between the bell housing and the tripod pin. Simply by ensuring that the angle between the centerline of the bell housing slideway and the axis of the tripod pin within the slideway is within the assembly angle range, the bell housing and tripod pin can be perfectly assembled together, ensuring that the assembly angle between the two is within the appropriate range, and effectively controlling the circumferential clearance and axial play of the drive shaft.

[0055] 6. This application provides a very simple method for calculating the maximum assembly angle. By constructing a limit state and analyzing the assembly dimensional relationship between the ball ring, bell housing slideway, and tripod based on the structure of the tripod universal joint, the maximum assembly angle value is calculated based on the ideal relationship between the three. The operation is simple.

[0056] 7. The present application also relates to a drive shaft tripod universal joint assembly system. The assembly system of the present application can be integrated into the design system or assembly system of the drive shaft. Based on the aforementioned method, it can quickly guide designers to design a drive shaft tripod universal joint that meets the NVH performance requirements during the early design stage, and can also subsequently guide assemblers to assemble the tripod universal joint well.

[0057] The drive shaft tripod universal joint assembly method of the present application can optimize the design and assembly of the drive shaft tripod universal joint, and can optimize and limit the assembly dimensions of components that affect the NVH performance during the drive shaft vibration process, thereby facilitating the operation of designers and assemblers, effectively controlling the drive shaft circumferential clearance and axial movement, and improving the problem of NVH performance degradation caused by drive shaft vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 : Schematic diagram of the explosion of the tripod universal joint of the present application;

[0059] Figure 2 : Schematic diagram of the bell-shaped housing structure of the present application;

[0060] Figure 3 : Schematic diagram of the three-column pin structure of this application;

[0061] Figure 4 : Schematic diagram of the ball ring structure of this application;

[0062] Figure 5 : Schematic diagram of the assembly of the tripod pin, ball ring and bell housing under the limit state of this application;

[0063] Among them: 1—bell-shaped housing; 2—three-column pin; 3—ball ring. DETAILED DESCRIPTION

[0064] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention.

[0065] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0067] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0068] This application relates to a method for assembling a tripod universal joint of a drive shaft. This application mainly optimizes the assembly operation of the tripod universal joint of the drive shaft to solve the problem of NVH performance degradation caused by the mutual friction and collision of the internal components of the tripod universal joint when the drive shaft vibrates. The tripod universal joint structure of this application is as follows: Figure 1 As shown, it includes a bell housing 1, which is a hollow shell structure with one end open. A tripod pin 2 is assembled in the bell housing 1. The tripod pin 2 is a cylindrical body with three cylindrical pins arranged at equal intervals along the circumference of the body. A ball ring 3 is sleeved on the pin body. The ball ring 3 is an annular structure connected to the pin body and can rotate around the axis of the pin body. A slideway (such as Figure 2 As shown), the ball ring 3 is sleeved on the tripod pin 2 and assembled into the bell housing 1 together with the tripod pin 2, and the ball ring 3 is assembled in the slideway.

[0069] During actual assembly, the ball ring 3 is sleeved onto the tripod 2 (here, the pin body). The axis of the ball ring 3 and the tripod 2 (the pin body axis) coincide. When the tripod 2 is assembled into the bell housing 1, the axis of the tripod 2's cylindrical body coincides with the axis of the bell housing 1 and also with the axis of the drive shaft. The axis of the tripod 2 (the pin body axis) and the axis of the tripod 2's cylindrical body intersect at the center of the cylindrical body.

[0070] The ball ring 3 is mounted on the tripod 2 and then assembled into the slideway of the bell housing 1. To avoid noise caused by collision and friction during the vibration of the drive shaft, the clearance between the inner ring of the ball ring 3 and the tripod 2, as well as the clearance between the outer ring of the ball ring 3 and the slideway, must be within an appropriate range. Normally, the clearances between the two ends of the same ball ring 3 and the corresponding slideway are equal, meaning that the axis of the corresponding tripod 2 is centered within the slideway. However, this is theoretical. In actual assembly, the cylindrical body of the tripod 2 may have an angle around its axis, resulting in unequal clearances between the ball ring 3 and the inner side surfaces of the slideways on both sides.

[0071] Therefore, during the assembly process of the tripod universal joint, it is necessary to optimize the gap between the slideway of the bell housing 1 and the outer ring of the ball ring 3, the gap between the inner ring of the ball ring 3 and the tripod 2, and the assembly angle between the tripod 2 and the bell housing 1.

[0072] Specifically, such as Figures 1 to 5 As shown, a drive shaft tripod universal joint assembly method of the present application can be performed according to the following steps:

[0073] S1. Set the unit value based on the width tolerance of the tripod universal joint of the drive shaft;

[0074] The setting of unit values ​​is the basis of the entire assembly method. The unit values ​​are set according to the width tolerance of the corresponding specification and model of the drive shaft tripod universal joint. By setting the unit values ​​in this way, it can be ensured that the final limit of the clearance and assembly angle of the tripod universal joint components is in line with the requirements of the drive shaft tripod universal joint of this specification and model, and there is a theoretical basis for it.

[0075] S2. Obtaining, based on the unit value, a first assembly condition between the slideway of the bell housing 1 and the ball ring 3, a second assembly condition between the ball ring 3 and the tripod 2, and a third assembly condition between the slideway, the ball ring 3, and the tripod 2 of the drive shaft tripod universal joint;

[0076] The first, second, and third assembly conditions all correspond to the gaps between the ball ring 3, the slideway, and the tripod pin 2. By constructing the above assembly conditions in units, the assembly range between the ball ring 3, the slideway, and the tripod pin 2 is defined based on these assembly conditions, which can provide guidance in both design and assembly.

[0077] S3. Obtaining the assembly angle range of the bell housing 1 and the tripod pin 2 based on the unit value;

[0078] The assembly angle range is to determine the relative angle range between the cylindrical body of the tripod pin 2 and the bell housing 1 around the axis of the drive shaft, which reflects the angular relationship between the axis of the tripod pin 2 and the center line of the slideway of the bell housing 1. It is ensured as much as possible that the axis of the tripod pin 2 and the center line of the slideway of the bell housing 1 coincide with each other. In this way, after the ball ring 3 is assembled on the tripod pin 2, the gap between the two sides of the ball ring 3 and the two sides of the slideway is uniform, avoiding the situation where one side is larger and the other side is smaller.

[0079] S4. Assemble the driving shaft tripod universal joint based on the first assembly condition, the second assembly condition, the third assembly condition, and the assembly angle range.

[0080] In some embodiments of the present application, this embodiment optimizes the above-mentioned step S1, and the specific method of setting the unit value based on the width tolerance of the drive shaft tripod universal joint is: the setting value used to distinguish the width tolerance size gear of the drive shaft tripod universal joint is used as the unit value n.

[0081] The set value reflects the machining accuracy of the tripod joint of the drive shaft. For example, the width tolerance of the tripod joint of the drive shaft is divided into grades according to the machining accuracy. Assuming that it is divided into one grade according to 5 wires (0.05mm), then the set value of the tripod joint of the drive shaft should be 0.05mm, and the unit value is 0.05mm.

[0082] The setting of the unit value is determined based on the machining tolerance of the drive shaft tripod universal joint and is directly related to the machining accuracy. The unit value obtained based on this method can accurately reflect the machining accuracy of the drive shaft tripod universal joint, greatly facilitating subsequent assembly operations.

[0083] In a further embodiment of the present application, this embodiment optimizes the above-mentioned step S2. Specifically, the method for obtaining the first assembly condition between the bell housing 1 slide and the ball ring 3 of the drive shaft tripod universal joint, the second assembly condition between the ball ring 3 and the tripod 2, and the third assembly condition between the slide, the ball ring 3 and the tripod 2 based on the unit value is: the first assembly condition refers to the first difference between the width of the bell housing 1 slide and the corresponding outer diameter width of the ball ring 3 is between 0 and the unit value n; the second assembly condition refers to the second difference between the inner diameter width of the ball ring 3 and the width of the corresponding tripod 2 is between 0 and the unit value n; the third assembly condition refers to the sum of the first difference and the second difference is between 0 and the unit value n.

[0084] like Figure 2 As shown, the width of the slideway of the bell housing 1 of this embodiment is Figure 2 The L1 shown is actually the distance between the end points on both sides of the slide. The end points on both sides of the slide refer to the two outermost points of the slide, i.e. Figure 2 a and b in the figure); the width of the tripod pin 2 refers to Figure 3 L2 shown (actually the width of the pin body); the outer diameter of the ball ring 3 refers to Figure 4 L4 (i.e. outer diameter of ball ring 3) is shown, and inner diameter of ball ring 3 is Figure 4 L3 (i.e., the inner diameter of ball ring 3) is shown. The first difference (L14) between the width of the bell housing 1's slideway and the corresponding outer diameter of the ball ring 3 is L1-L4. The second difference (L32) between the inner diameter of the ball ring 3 and the width of the tripod pin 2 is L3-L2. The dimensional chain tolerance ΔL between the bell housing 1, ball ring 3, and tripod pin 2 is L14+L32.

[0085] Before assembling the universal joint, select the size of the universal joint to be assembled (because even products of the same model and specification may have dimensional errors on the components. By selecting appropriate components for assembly, the noise problem caused by component friction and collision caused by the vibration of the drive shaft during subsequent use can be eliminated to the greatest extent). Select the components for assembly according to the following method:

[0086] 0 <L14<n

[0087] 0 <L32<n

[0088] 0<ΔL <n

[0089] Among them, 0 < L14 < n and 0 < L32 < n are used to select the bell housing 1, the spherical ring 3, and the three-pin 2 on a large scale, which can narrow the range of the bell housing 1, the spherical ring 3, and the three-pin 2 to be adapted from the universal joint to be assembled. Then, based on 0 < ΔL < n, the narrowed range is further screened, and finally, the bell housing 1, the spherical ring 3, and the three-pin 2 that meet the clearance installation requirements are obtained. As long as the above-mentioned dimensional assembly requirements are met, it is considered that the current bell housing 1, spherical ring 3, and three-pin 2 can be assembled together and meet the assembly requirements.

[0090] In a further embodiment of the present application, this embodiment optimizes the above step S3. Specifically, the method for obtaining the assembly angle range between the bell housing 1 and the three-pin 2 based on the unit value is as follows: Construct a limit state with the clearance between one side of the spherical ring 3 against the side wall of the corresponding slideway and the other side against the slideway as the unit value. The difference between the angle between the connection line between the end point of the clearance side slideway and the axis of the driving shaft and the axis of the three-pin 2 in the corresponding slideway and the angle between the connection line between the end point of the spherical ring 3 on the clearance side and the axis of the driving shaft and the axis of the three-pin 2 in the corresponding slideway in the limit state is the maximum assembly angle value, and the assembly angle range is from 0 to the maximum assembly angle value.

[0091] The limit state of this embodiment is that when one side of the spherical ring 3 is in close contact with one side of the slideway of the bell housing 1, the clearance between the other side and the other side of the slideway of the bell housing 1 is just the unit value n. That is, at this time, simply from the assembly dimensions between the bell housing 1 and the spherical ring 3, it meets the requirements of step S2, that is, it meets the assembly clearance requirements. However, if assembled according to this situation at this time, the spherical ring 3 is in contact with the slideway, and the required clearance installation requirements cannot be achieved. Therefore, the assembly angle between the three-pin 2 and the slideway of the bell housing 1 needs to be limited.

[0092] By constructing the limit state, the maximum assembly angle between the three-pin 2 and the slideway can be determined, and the feasible assembly angle range can be determined based on the maximum assembly angle. Figure 5 is the cross-section of the driving shaft in the axial direction of the three-ball pin universal joint. Taking point O as the center of the three-pin 2, at this time, the three-pin 2 and the bell housing 1 are coaxially arranged. Taking point A as the center of the spherical ring 3, the connection line between the center of the three-pin 2 and the center of the spherical ring 3 is the axis of the three-pin 2. Figure 5 Point B in is the end point of the clearance side slideway, Figure 5 Point C in is the end point of the spherical ring 3 on the clearance side. The distance between the end point C of the spherical ring 3 on the clearance side and the center A of the spherical ring 3 is known, which is 0.5L4. In the limit state, the clearance between the end point B of the clearance side slideway and the end point C of the spherical ring 3 on the clearance side is the unit value n. At this time, the angle between the connection line BO between the end point B of the clearance side slideway and the center O point of the three-pin 2 and the connection line AO between the center A of the spherical ring 3 and the center O point of the three-pin 2 is β, that is, the first angle, as shown in Figure 5As shown, the angle between the line CO between the end point C of the gap side ball ring 3 and the center point O of the tripod 2 and the line AO ​​between the center point A of the ball ring 3 and the center point O of the tripod 2 is α, which is the second angle. The difference between α and β is equivalent to the axis of the tripod 2 in the limit state (i.e., Figure 5 AO shown) and the slide centerline (the slide centerline refers to the center line between the end points on both sides of the slide. The end points on both sides of the slide are arranged symmetrically with the slide centerline as the center. Figure 2 The angle between the connecting line of points d and c (point d is the center point of the bell housing 1, and point c is the midpoint of the side of the slideway away from the center point) can be easily calculated by constructing α and β, that is, the angle between the axis of the tripod 2 and the center line of the slideway in the limit state, that is, the maximum assembly angle value.

[0093] According to the above method, the maximum assembly angle value is calculated according to the following formula:

[0094]

[0095] Where: α——second angle;

[0096] β——first angle;

[0097] θ0——maximum assembly angle value;

[0098] L4——outer diameter of ball ring 3;

[0099] n——unit value;

[0100] R - the distance between the center of the ball ring 3 and the axis of the drive shaft.

[0101] During actual assembly, when the maximum assembly angle value is obtained, the assembly angle range can be set from 0 to the maximum assembly angle value. Assembly within the assembly angle range can make the tripod 2 as close to the middle position of the slide as possible, and make the axis of the tripod 2 coincide with the center line of the slide as much as possible, ensuring that the ball ring 3 is in the middle position of the slide as much as possible, and the gap between the two sides of the ball ring 3 and the two sides of the slide is within an appropriate range.

[0102] During assembly, the angle between the center line of the slideway of the bell housing 1 and the axis of the tripod pin 2 in the slideway on the same axial section is within the assembly angle range.

[0103] In actual application, the set value used to distinguish the width tolerance size gear of the driving shaft tripod universal joint is used as the unit value; based on the unit value, the first assembly condition between the bell housing 1 slideway and the ball ring 3, the second assembly condition between the ball ring 3 and the tripod 2, and the third assembly condition between the slideway, the ball ring 3 and the tripod 2 of the driving shaft tripod universal joint are obtained, the first assembly condition refers to the first difference between the width of the bell housing 1 slideway and the width of the corresponding ball ring 3 outer diameter is between 0 and the unit value, the second assembly condition refers to the second difference between the width of the inner diameter of the ball ring 3 and the width of the corresponding tripod 2 is between 0 and the unit value, and the third assembly condition refers to the sum of the first difference and the second difference is between 0 and the unit value; a construction is constructed with one side of the ball ring 3 tightly attached to the corresponding slideway side wall and the other side tightly attached to the slide The limit state of the track clearance being a unit value, the difference between the angle between the line between the end point of the clearance side slideway and the axis of the drive shaft and the axis of the tripod 2 in the corresponding slideway under the limit state and the angle between the line between the end point of the clearance side ball ring 3 in the slideway and the axis of the drive shaft and the axis of the tripod 2 in the corresponding slideway is the maximum assembly angle value, and the assembly angle range is from 0 to the maximum assembly angle value; the bell shell 1, tripod 2 and ball ring 3 of the tripod universal joint that meet the first assembly condition, the second assembly condition and the third assembly condition are selected, and the bell shell 1, tripod 2 and ball ring 3 are assembled in a manner that the angle between the center line of the bell shell 1 slideway on the same axial section and the axis of the tripod 2 in the slideway is within the assembly angle range to complete the assembly operation.

[0104] In addition, the present application also provides a drive shaft tripod universal joint assembly system, including a unit value determination module, an assembly clearance condition acquisition module, an assembly angle condition acquisition module and an assembly optimization module, wherein the unit value determination module sets a unit value based on the width tolerance of the drive shaft tripod universal joint; the assembly clearance condition acquisition module acquires a first assembly condition between the bell housing 1 slideway and the ball ring 3, a second assembly condition between the ball ring 3 and the tripod 2, and a third assembly condition between the slideway, the ball ring 3 and the tripod 2 of the drive shaft tripod universal joint based on the unit value; the assembly angle condition acquisition module acquires an assembly angle range between the bell housing 1 and the tripod 2 based on the unit value; and the assembly optimization module assembles the drive shaft tripod universal joint based on the first assembly condition, the second assembly condition, the third assembly condition and the assembly angle range.

[0105] The unit value determination module uses the set value used to distinguish the width tolerance size gear of the driving shaft tripod universal joint as the unit value.

[0106] The assembly clearance condition acquisition module includes a first assembly condition acquisition module, a second assembly condition acquisition module and a third assembly condition acquisition module. The first assembly condition acquisition module determines the first assembly condition according to the requirement that the first difference between the width of the bell housing 1 slideway and the width of the corresponding ball ring 3 outer diameter is between 0 and the unit value; the second assembly condition acquisition module determines the second assembly condition according to the requirement that the second difference between the width of the inner diameter of the ball ring 3 and the width of the corresponding tripod pin 2 is between 0 and the unit value; the third assembly condition acquisition module determines the third assembly condition according to the requirement that the sum of the first difference and the second difference is between 0 and the unit value

[0107] The assembly angle condition acquisition module includes a limit state construction module, a first angle acquisition module, a second angle acquisition module, a maximum assembly angle value acquisition module and an assembly angle range acquisition module. The limit state construction module constructs a limit state with one side of the ball ring 3 tightly attached to the corresponding slide side wall and the other side having a gap with the slide as a unit value; the first angle acquisition module takes the angle between the line between the end point of the gap side slide and the axis of the drive shaft in the limit state and the axis of the three-column pin 2 in the corresponding slide as the first angle; the second angle acquisition module takes the angle between the line between the corresponding side end point of the ball ring 3 in the slide and the axis of the drive shaft and the axis of the three-column pin 2 in the corresponding slide in the limit state as the second angle; the maximum assembly angle value acquisition module takes the difference between the first angle and the second angle as the maximum assembly angle; and the assembly angle range acquisition module takes the assembly angle range from 0 to the maximum assembly angle.

[0108] The assembly optimization module includes an assembly angle optimization module, which is assembled in such a way that the angle between the center line of the bell housing 1 slideway and the axis of the tripod 2 in the slideway on the same axial section is within the assembly angle range.

[0109] The maximum assembly angle value acquisition module calculates the maximum assembly angle value according to the following formula:

[0110]

[0111] Where: α——second angle;

[0112] β——first angle;

[0113] θ0——maximum assembly angle value;

[0114] L4——outer diameter of ball ring 3;

[0115] n——unit value;

[0116] R - the distance between the center of the ball ring 3 and the axis of the drive shaft.

[0117] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for assembling a drive shaft tripod universal joint, characterized in that: include, Set the unit value based on the width tolerance of the drive shaft tripod joint; Obtaining, based on the unit value, a first assembly condition between a bell housing slideway and a ball ring, a second assembly condition between the ball ring and the tripod, and a third assembly condition between the slideway, the ball ring, and the tripod of the drive shaft tripod universal joint; Get the assembly angle range of the bell housing and the tripod pin based on the unit value; Assembling the drive shaft tripod universal joint based on the first assembly condition, the second assembly condition, the third assembly condition and the assembly angle range; The method for setting a unit value based on the width tolerance of the driving shaft tripod universal joint includes: using a setting value for distinguishing the width tolerance size gear of the driving shaft tripod universal joint as the unit value; The method for obtaining a first assembly condition between a bell housing slideway and a ball ring, a second assembly condition between the ball ring and a tripod, and a third assembly condition between the slideway, the ball ring, and the tripod of a drive shaft tripod universal joint based on unit values ​​includes: the first assembly condition refers to a first difference between a width of the bell housing slideway and an outer diameter width of the corresponding ball ring being between 0 and the unit value; the second assembly condition refers to a second difference between an inner diameter width of the ball ring and a width of the corresponding tripod being between 0 and the unit value; and the third assembly condition refers to a sum of the first difference and the second difference being between 0 and the unit value; The method for obtaining the assembly angle range of the bell housing and the tripod pin based on the unit value includes: constructing a limit state with one side of the ball ring tightly attached to the corresponding slide side wall and the other side of the slide with a gap as the unit value, and taking the difference between the angle between the line between the end point of the slide on the gap side and the axis of the drive shaft and the axis of the tripod pin in the corresponding slide in the limit state and the angle between the line between the end point of the ball ring on the gap side in the slide and the axis of the drive shaft and the axis of the tripod pin in the corresponding slide as the maximum assembly angle value, and the assembly angle range is from 0 to the maximum assembly angle value.

2. A drive shaft tripod universal joint assembly method according to claim 1, characterized in that: The angle between the center line of the bell housing slideway and the axis of the three-column pin in the slideway on the same axial section is within the assembly angle range.

3. The drive shaft tripod universal joint assembly method according to claim 1, characterized in that: The maximum assembly angle value is calculated according to the following formula: Where: α——second angle; β——first angle; θ0——maximum assembly angle value; L4 - outer diameter of the ball ring; n——unit value; R - the distance between the center of the ball ring and the axis of the drive shaft.

4. A drive shaft tripod universal joint assembly system, characterized by: The system is operated according to a drive shaft tripod universal joint assembly method according to any one of claims 1 to 3, comprising: a unit value determining module, the unit value determining module setting the unit value based on a width tolerance of a tripod universal joint of the drive shaft; an assembly clearance condition acquisition module, the assembly clearance condition acquisition module acquiring, based on the unit value, a first assembly condition between the bell housing slideway and the ball ring, a second assembly condition between the ball ring and the tripod, and a third assembly condition between the slideway, the ball ring, and the tripod of the drive shaft tripod universal joint; an assembly angle condition acquisition module, the assembly angle condition acquisition module acquiring an assembly angle range of the bell housing and the tripod pin based on a unit value; An assembly optimization module is provided for assembling the driving shaft tripod universal joint based on the first assembly condition, the second assembly condition, the third assembly condition and the assembly angle range.

5. The drive shaft tripod universal joint assembly system according to claim 4, characterized in that: The unit value determination module uses the set value used to distinguish the width tolerance size gear of the driving shaft tripod universal joint as the unit value.

6. The drive shaft tripod universal joint assembly system according to claim 4, characterized in that: The assembly clearance condition acquisition module includes: a first assembly condition acquisition module, which determines a first assembly condition according to a requirement that a first difference between a bell housing slideway width and an outer diameter width of a corresponding ball ring is between 0 and unity; a second assembly condition acquisition module, the second assembly condition acquisition module determining a second assembly condition according to a requirement that a second difference between the inner diameter width of the ball ring and the width of the corresponding tripod pin is between 0 and unity; A third assembly condition acquisition module is configured to determine a third assembly condition according to a requirement that the sum of the first difference and the second difference is between 0 and unity.

7. The drive shaft tripod universal joint assembly system according to claim 4, characterized in that: The assembly angle condition acquisition module includes: A limit state construction module, wherein the limit state construction module constructs a limit state with a gap between one side of the ball ring and the corresponding slideway side wall being in close contact with the other side of the ball ring and the slideway as a unit value; A first angle acquisition module, wherein the first angle acquisition module uses the angle between the line between the end point of the clearance side slideway and the axis of the drive shaft in the limit state and the axis of the tripod in the corresponding slideway as the first angle; A second angle acquisition module, wherein the second angle acquisition module uses the angle between the line between the corresponding side end point of the ball ring in the slideway and the axis of the drive shaft in the limit state and the axis of the tripod in the corresponding slideway as the second angle; a maximum assembly angle value acquisition module, wherein the maximum assembly angle value acquisition module uses the difference between the first angle and the second angle as the maximum assembly angle; The assembly angle range acquisition module uses 0 to the maximum assembly angle value as the assembly angle range.

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