Driving shaft tripod universal joint assembling method and system

Abstract

The invention relates to the technical field of automobile driving shafts, in particular to a driving shaft tripod universal joint assembling method and system. Comprising the steps that a unit value is set based on the width tolerance of the three-ball-pin universal joint of the driving shaft; based on the unit values, obtaining a first assembly condition between a bell housing slideway and a ball ring of the driving shaft tripod universal joint, a second assembly condition between the ball ring and a tripod, and a third assembly condition among the slideway, the ball ring and the tripod; the assembling angle range of the difference value between the bell housing indexing angle and the three-pin indexing angle is obtained based on the unit value; and the assembly size of the driving shaft tripod universal joint is obtained based on the first assembly condition, the second assembly condition, the third assembly condition and the assembly angle range. According to the driving shaft tripod universal joint assembling method, the tripod universal joint of the driving shaft can be well optimally designed and assembled, the circumferential clearance and the axial movement of the driving shaft are controlled, and the problem that the NVH performance is reduced due to shaking of the driving shaft is solved.

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 tripod universal joint of a drive shaft. 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 is mainly through limiting 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 deviation of the whole vehicle during acceleration caused by the inconsistent torsion angle of the left and right half shafts. The resonance phenomenon caused by different engine speed conditions is eliminated by limiting the length of the left and right half shafts, thereby improving the NVH performance and economic performance of the vehicle.

[0003] However, in actual application, it was found that the NVH performance problems caused by drive shaft vibration still exist. This shows that the NVH problems caused by drive shaft vibration are not only due to the inconsistent torsion angles of the left and right half shafts of the drive shaft, but also due to 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, it includes a bell-shaped housing 1, which is a hollow shell structure with one end open. A tripod pin 2 is assembled in the bell-shaped housing 1. The tripod pin 2 is a cylindrical body with three columnar pin bodies 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. An arc-shaped slideway is arranged on the inner side of the bell-shaped housing 1. The ball ring 3 is sleeved on the tripod pin 2 and assembled into the bell-shaped housing 1 together with the tripod pin 2. The ball ring 3 is assembled in the slideway.

[0005] By analyzing the jitter phenomenon of the drive shaft in combination with the drive shaft structure, it is found that the main reason for this phenomenon is that there are problems with 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 derived force, and finally causing a significant reduction in the NVH performance of the drive shaft. At present, most drive shafts determine the assembly dimensions based on empirical values ​​in the early stages of design, and there is no definite method to limit the circumferential clearance. This results in many drive shafts having deviations in the assembly dimensions of the ball ring, slideway and tripod. Finally, the assembled drive shaft shakes 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 driving 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] Based on the unit value, obtain a first assembly condition between a bell housing slideway and a ball ring, a second assembly condition between the ball ring and a tripod pin, and a third assembly condition between the slideway, the ball ring, and the tripod pin of a driving shaft tripod universal joint;

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

[0011] The driving 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 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 joint includes: using a setting value for distinguishing the width tolerance size gear of the drive shaft tripod joint as the unit value.

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

[0014] According to a method for assembling a drive shaft tripod universal joint 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 having a gap with the slide as the unit value, 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 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 in the corresponding slide is the maximum assembly angle value, and the assembly angle range is from 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] tanα=L4 / 2R

[0018] tanβ=(0.5L4+n) / R

[0019] θ0=β-α

[0020] Where: α——the second angle;

[0021] β——first angle;

[0022] θ0——maximum assembly angle value;

[0023] L4——outer diameter of ball ring;

[0024] n——unit value;

[0025] R - the distance between the center of the ball ring and the axis of the drive shaft.

[0026] The present application also provides a drive shaft tripod universal joint assembly system, the system is operated according to a drive shaft tripod universal joint assembly method according to any one of claims 1 to 6, comprising:

[0027] a unit value determination module, the unit value determination module setting the unit value based on a width tolerance of a drive shaft tripod universal joint;

[0028] An assembly clearance condition acquisition module, which acquires, 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 a tripod pin, and a third assembly condition between the slideway, the ball ring, and the tripod pin of a driving shaft tripod universal joint;

[0029] An assembly angle condition acquisition module, wherein the assembly angle condition acquisition module acquires an assembly angle range of the bell housing and the tripod pin based on a unit value;

[0030] An assembly optimization module is provided, wherein the assembly optimization module assembles the driving shaft tripod universal joint based on a first assembly condition, a second assembly condition, a third assembly condition and an assembly angle range.

[0031] 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 a width tolerance size gear position of the drive shaft tripod universal joint as a unit value.

[0032] According to a drive shaft tripod universal joint assembly system provided by the present application, the assembly clearance condition acquisition module includes:

[0033] 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 a unit value;

[0034] A second assembly condition acquisition module, which determines the second assembly condition according to the 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 a unit value;

[0035] A third assembly condition acquisition module is configured to determine the third assembly condition according to the requirement that the sum of the first difference and the second difference is between 0 and unity.

[0036] According to a drive shaft tripod universal joint assembly system provided by the present application, the assembly angle condition acquisition module includes:

[0037] A limit state construction module, wherein the limit state construction module constructs a limit state in which one side of the ball ring is in close contact with the corresponding slideway side wall and the other side has a clearance with the slideway as a unit value;

[0038] A first angle acquisition module, wherein the first angle acquisition module takes 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 pin in the corresponding slideway as the first angle;

[0039] A second angle acquisition module, wherein the second angle acquisition module takes the angle between the line between the end point of the corresponding side of the ball ring in the slideway and the axis of the drive shaft in the limit state and the axis of the tripod pin in the corresponding slideway as the second angle;

[0040] A maximum assembly angle value acquisition module, wherein the maximum assembly angle value acquisition module takes the difference between the first angle and the second angle as the maximum assembly angle;

[0041] The assembly angle range acquisition module uses 0 to a maximum assembly angle value as the assembly angle range.

[0042] According to a drive shaft tripod universal joint assembly system provided by the present application, the assembly optimization module includes:

[0043] 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 pin in the slideway on the same axial section is within the assembly angle range.

[0044] 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:

[0045] tanα=L4 / 2R

[0046] tanβ=(0.5L4+n) / R

[0047] θ0=β-α

[0048] Where: α——the second angle;

[0049] β——first angle;

[0050] θ0——maximum assembly angle value;

[0051] L4——outer diameter of ball ring;

[0052] n——unit value;

[0053] R - the distance between the center of the ball ring and the axis of the drive shaft.

[0054] The advantages of the present application are as follows: 1. The present application constructs a unit value based on the width tolerance of the tripod universal joint of the drive shaft, analyzes the structure of the tripod universal joint, and defines the assembly relationship of the components of the tripod universal joint that may cause abnormal noise during the vibration of the drive shaft based on the unit value, so that the assembly between the bell housing, the ball ring and the tripod pin that are most likely to affect the NVH performance is within an appropriate range, and will not cause noise problems caused by large vibration amplitude of components due to excessive clearance, can effectively reduce the periodic axial force caused by friction, can effectively control the circumferential clearance and axial movement of the drive shaft, and improve the problem of NVH performance degradation caused by the vibration of the drive shaft;

[0055] 2. This application determines the unit value based on the setting value of the width tolerance size gear of the driving shaft tripod universal joint. The unit value is closely related to the assembly requirements of the driving shaft tripod universal joint. The unit value determined in this way is based on a basis, not generated out of thin air, and does not rely on personal experience. The acquisition method is more scientific and reasonable, and can guide the subsequent design optimization operation of the assembly size;

[0056] 3. The method of constructing the first assembly condition, the second assembly condition and the third assembly condition in the present application is very simple. By determining the above three assembly conditions, the gap width between the bell housing slideway, the ball ring and the tripod pin can be effectively determined, and appropriate components can be selected so that the three can be assembled to achieve a tight fit, which is convenient for subsequent assembly operations;

[0057] 4. The present application determines the maximum allowable assembly angle by using the limit state constructed by the ball ring. In this way, the maximum assembly angle value can be obtained. The maximum assembly angle value can quickly determine the assembly angle relationship between the tripod pin and the bell housing, so that the tripod pin is in the middle position of the slide as much as possible, avoiding the collision and friction problems caused by unequal gaps between the ball ring and the slides on both sides, too large gap on one side and too small gap on the other side. The method for determining the assembly angle range is very simple;

[0058] 5. The optimization method for the assembly angle of the bell housing and the tripod pin in the present application is very simple. It only needs to ensure that the angle between the center line of the bell housing slideway and the axis of the tripod pin in the slideway is within the assembly angle range, so that the bell housing and the tripod pin can be assembled together intact, so that the assembly angle of the two is within the appropriate range, and the circumferential clearance and axial movement of the drive shaft can be effectively controlled;

[0059] 6. The method for calculating the maximum assembly angle in this application is very simple. This application constructs a limit state, analyzes the assembly dimension relationship of the ball ring, bell housing slideway and tripod pin based on the structure of the tripod universal joint, and calculates the maximum assembly angle value based on the ideal relationship between the three, which is simple to operate;

[0060] 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.

[0061] The drive shaft tripod universal joint assembly method of the present application can optimize the design and assembly of the tripod universal joint of the drive shaft, and can optimize and limit the assembly dimensions of the components that affect the NVH performance during the drive shaft vibration, thereby facilitating the operation of designers and assemblers, effectively controlling the drive shaft circumferential clearance and axial play, and improving the problem of NVH performance degradation caused by drive shaft vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 : Schematic diagram of the explosion of the tripod universal joint of the present application;

[0063] Figure 2 : Schematic diagram of the bell-shaped housing structure of the present application;

[0064] Figure 3 : Schematic diagram of the three-column pin structure of this application;

[0065] Figure 4 : Schematic diagram of the ball ring structure of the present application;

[0066] Figure 5 : Schematic diagram of the assembly of the tripod pin, ball ring and bell housing under the limit state of the present application;

[0067] Among them: 1—bell-shaped housing; 2—three-column pin; 3—ball ring. DETAILED DESCRIPTION

[0068] 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 with 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, and should not be construed as limiting the present invention.

[0069] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0072] The present application relates to a method for assembling a tripod universal joint of a drive shaft. The present application mainly optimizes the assembly operation of the tripod universal joint of the drive shaft, so as to solve the problem of NVH performance degradation caused by mutual friction and collision of the internal components of the tripod universal joint when the drive shaft vibrates. Figure 1 As shown, it includes a bell-shaped housing 1, which is a hollow shell structure with one end open. A tripod pin 2 is assembled in the bell-shaped housing 1. The tripod pin 2 is a cylindrical body with three columnar pin bodies 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.

[0073] During actual assembly, the ball ring 3 is sleeved onto the tripod pin 2 (here, the pin body), the axis of the ball ring 3 and the tripod pin 2 (the pin body axis) are coincident, the tripod pin 2 is assembled into the bell housing 1, the axis of the cylindrical body of the tripod pin 2 is coincident with the axis of the bell housing 1, and also coincident with the axis of the drive shaft. The axis of the tripod pin 2 (the pin body axis) and the axis of the cylindrical body of the tripod pin 2 intersect at the center of the cylindrical body.

[0074] The ball ring 3 is sleeved on the tripod pin 2 and then assembled into the slideway of the bell housing 1. In order to avoid the noise caused by the collision and friction between the driving shaft during the shaking process, the gap between the inner ring of the ball ring 3 and the tripod pin 2 and the gap between the outer ring of the ball ring 3 and the slideway are required to be within a suitable range. Under normal circumstances, the gaps between the two ends of the same ball ring 3 and the corresponding slideway are equal, that is, the axis of the corresponding tripod pin 2 is in the middle position of the slideway at this time, but this is a theoretical situation. In the actual assembly situation, the cylindrical body of the tripod pin 2 may have an angle around the axis, resulting in unequal gaps between the ball ring 3 and the inner side surfaces of the slideways on both sides.

[0075] 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 pin 2, and the assembly angle between the tripod pin 2 and the bell housing 1.

[0076] Specifically, Figures 1 to 5 As shown, a driving shaft tripod universal joint assembly method of the present application can be performed according to the following steps:

[0077] S1, setting unit value based on width tolerance of tripod universal joint of drive shaft;

[0078] The setting of the unit value is the basis of the entire assembly method. The unit value is set according to the width tolerance of the drive shaft tripod universal joint of the corresponding specification and model. By setting the unit value 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 the specification and model, and there is a theoretical basis.

[0079] S2, obtaining 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 pin 2, and a third assembly condition between the slideway, the ball ring 3 and the tripod pin 2 of the driving shaft tripod universal joint based on the unit value;

[0080] The first assembly condition, the second assembly condition and the third assembly condition 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 form a guiding significance in both design and assembly.

[0081] S3, obtaining the assembly angle range of the bell housing 1 and the tripod pin 2 based on the unit value;

[0082] 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 angle relationship between the axis of the tripod pin 2 and the center line of the slideway of the bell housing 1, and to ensure that the axis of the tripod pin 2 and the center line of the slideway of the bell housing 1 coincide as much as possible, so that 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 slideways on both sides is uniform, avoiding the situation where one side is larger and the other side is smaller;

[0083] 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.

[0084] 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 joint is: the setting value used to distinguish the width tolerance size gear of the drive shaft tripod joint is used as the unit value n.

[0085] The set value reflects the machining accuracy of the tripod joint of the drive shaft. For example, the width tolerance size 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.

[0086] The setting of the unit value is determined based on the machining tolerance of the drive shaft tripod joint and is directly related to the machining accuracy. The unit value obtained in this way can accurately reflect the machining accuracy of the drive shaft tripod joint and greatly facilitate subsequent assembly operations.

[0087] 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 slideway of the bell housing 1 and the ball ring 3, the second assembly condition between the ball ring 3 and the tripod pin 2, and the third assembly condition between the slideway, the ball ring 3 and the tripod pin 2 of the driving shaft tripod universal joint based on the unit value is: the first assembly condition refers to the first difference between the width of the slideway of the bell housing 1 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 corresponding width of the tripod pin 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.

[0088] like Figure 2 As shown, the width of the slideway of the bell housing 1 of this embodiment refers to Figure 2 The L1 shown is actually the distance between the two end points of the slide. The two end points of the slide refer to the two outermost points of the slide. Figure 2 a and b); 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., the outer diameter of the ball ring 3) is shown, and the inner diameter of the ball ring 3 is Figure 4 L3 (i.e., the inner diameter of the ball ring 3) is shown. The first difference L14 between the width of the bell housing 1 slideway and the width of the corresponding outer diameter of the ball ring 3 is L1-L4; the second difference L32 between the width of the inner diameter of the ball ring 3 and the width of the corresponding tripod pin 2 is L3-L2; the dimensional chain tolerance ΔL between the bell housing 1, the ball ring 3 and the tripod pin 2 is L14+L32.

[0089] Before assembling the universal joint, size selection is carried out on the universal joint to be assembled (because even for products of the same model and specification, there are dimensional errors on the components. By selecting appropriate components for assembly, the noise problem caused by component friction and collision due to drive shaft jitter during subsequent use is eliminated to the greatest extent). The components for assembly are selected according to the following method:

[0090] 0 < L14 < n

[0091] 0 < L32 < n

[0092] 0 < ΔL < n

[0093] Among them, 0 < L14 < n and 0 < L32 < n are used to select the bell housing 1, ball ring 3 and three-pin 2 on a large scale, which can narrow the range of the bell housing 1, ball ring 3 and 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, ball ring 3 and 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, ball ring 3 and three-pin 2 can be assembled together and meet the assembly requirements.

[0094] 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 an extreme state with the unit value being the clearance between one side of the ball ring 3 and the corresponding slideway side wall and the other side being in contact with the slideway. The difference between the angle between the connection line between the end point of the clearance side slideway and the drive shaft axis 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 ball ring 3 on the clearance side in the corresponding slideway and the drive shaft axis and the axis of the three-pin 2 in the corresponding slideway is taken as the maximum assembly angle value, and the assembly angle range is from 0 to the maximum assembly angle value.

[0095] The extreme state of this embodiment is that when one side of the ball ring 3 is in close contact with one side of the slideway of the bell housing 1 and 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 ball ring 3, the requirements of step S2 are met, that is, the assembly clearance requirements are met. However, if assembled in this situation, the ball ring 3 is in contact with the slideway, and the required clearance installation requirements cannot be achieved. Therefore, it is necessary to limit the assembly angle between the three-pin 2 and the slideway of the bell housing 1.

[0096] By constructing the extreme state, the maximum assembly angle between the three-pin 2 and the slideway can be determined, and based on the maximum assembly angle, the feasible assembly angle range can be determined. Figure 5It is the cross section of the driving shaft in the axial direction of the tripod universal joint, with point O as the center of the tripod 2. At this time, the tripod 2 and the bell housing 1 are coaxially arranged, with point A as the center of the ball ring 3, and the line connecting the center of the tripod 2 and the center of the ball ring 3 is the axis of the tripod 2. Figure 5 Point B in the figure is the end point of the gap side slide. Figure 5 Point C in the figure is the end point of the gap side ball ring 3. The distance between the end point C of the gap side ball ring 3 and the center point A of the ball ring 3 is known, that is, 0.5L4. Under the limit state, the gap between the end point B of the gap side slideway and the end point C of the gap side ball ring 3 is a unit value n. At this time, the angle between the line BO between the end point B of the gap side slideway 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 β, that is, the first angle, such as Figure 5 As shown in the figure, the angle between the line BO between the end point C of the gap side ball ring 3 and the center point O of the tripod pin 2 and the line AO ​​between the center point A of the ball ring 3 and the center point O of the tripod pin 2 is α, i.e., the second angle. The difference between α and β is equivalent to the axis of the tripod pin 2 in the limit state (i.e., Figure 5 AO) and the slideway centerline (the slideway centerline refers to the centerline between the end points on both sides of the slideway. The end points on both sides of the slideway are arranged symmetrically with the slideway centerline as the center. Figure 2 The angle between the connecting line of point d and point c shown in the figure, 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), by constructing α and β, the angle between the axis of the tripod pin 2 and the center line of the slideway under the limit state, that is, the maximum assembly angle value, can be easily calculated.

[0097] As described above, calculate the maximum assembly angle value according to the following formula:

[0098] tanα=L4 / 2R

[0099] tanβ=(0.5L4+n) / R

[0100] θ0=β-α

[0101] Where: α——the second angle;

[0102] β——first angle;

[0103] θ0——maximum assembly angle value;

[0104] L4——outer diameter of ball ring 3;

[0105] n——unit value;

[0106] R - the distance between the center of ball ring 3 and the axis of drive shaft.

[0107] 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. Assembling within the assembly angle range can make the tripod pin 2 as close to the middle position of the slide as possible, make the axis of the tripod pin 2 coincide with the center line of the slide as much as possible, ensure that the ball ring 3 is finally 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.

[0108] 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.

[0109] 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 pin 2, and the third assembly condition between the slideway, the ball ring 3 and the tripod pin 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 corresponding outer diameter width of the ball ring 3 is between 0 and the unit value, the second assembly condition refers to the second difference between the inner diameter width of the ball ring 3 and the corresponding width of the tripod pin 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 in which one side of the ball ring 3 is in close contact with the corresponding slideway side wall, and the other side is in close contact with the slide The limit state in which the clearance between the slideways is 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 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 housing 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 housing 1, tripod 2 and ball ring 3 are assembled in a manner that the angle between the center line of the slideway of the bell housing 1 and the axis of the tripod 2 in the slideway on the same axial section is within the assembly angle range to complete the assembly operation.

[0110] 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.

[0111] 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.

[0112] 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 slideway of the bell housing 1 and the width of the outer diameter of the corresponding ball ring 3 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

[0113] 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 in the limit state and the axis of the three-column pin 2 in the corresponding slide 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.

[0114] 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 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.

[0115] The maximum assembly angle value acquisition module calculates the maximum assembly angle value according to the following formula:

[0116] tanα=L4 / 2R

[0117] tanβ=(0.5L4+n) / R

[0118] θ0=β-α

[0119] Where: α——the second angle;

[0120] β——first angle;

[0121] θ0——maximum assembly angle value;

[0122] L4——outer diameter of ball ring 3;

[0123] n——unit value;

[0124] R - the distance between the center of ball ring 3 and the axis of drive shaft.

[0125] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for assembling a driving shaft tripod universal joint, characterized in that: include, Set the unit value based on the width tolerance of the drive shaft tripod joint; Based on the unit value, obtain a first assembly condition between a bell housing slideway and a ball ring, a second assembly condition between the ball ring and a tripod pin, and a third assembly condition between the slideway, the ball ring, and the tripod pin of a driving shaft tripod universal joint; Obtain the assembly angle range of the bell housing and the tripod pin based on the unit value; The driving 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.

2. A driving shaft tripod universal joint assembly method as claimed in claim 1, characterized in that: The method for setting a unit value based on the width tolerance of the driving shaft tripod joint includes: using a setting value for distinguishing a size gear of the width tolerance of the driving shaft tripod joint as the unit value.

3. A driving shaft tripod universal joint assembly method as claimed in claim 1, characterized in that: 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 three-pin, and the third assembly condition between the slide, the ball ring and the three-pin of the driving 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 is 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 corresponding tripod width is between 0 and the unit value; the third assembly condition refers to the sum of the first difference and the second difference is between 0 and the unit value.

4. A driving shaft tripod universal joint assembly method as claimed in claim 1, characterized in that: 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 having a gap with the slide as the unit value, 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 taking 0 to the maximum assembly angle value as the assembly angle range.

5. A driving shaft tripod universal joint assembly method as claimed in claim 4, characterized in that: Make 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 within the assembly angle range.

6. A driving shaft tripod universal joint assembly method as claimed in claim 4, characterized in that: The maximum assembly angle value is calculated according to the following formula: tanα=L4 / 2R tanβ=(0.5L4+n) / R θ0=β-α Where: α——the second angle; β——first angle; θ0——maximum assembly angle value; L4——outer diameter of ball ring; n——unit value; R - the distance between the center of the ball ring and the axis of the drive shaft.

7. A drive shaft tripod universal joint assembly system, characterized in that: The system is operated according to a drive shaft tripod universal joint assembly method as claimed in any one of claims 1 to 6, comprising: a unit value determination module, the unit value determination module setting the unit value based on a width tolerance of a drive shaft tripod universal joint; An assembly clearance condition acquisition module, which acquires, 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 a tripod pin, and a third assembly condition between the slideway, the ball ring, and the tripod pin of a driving shaft tripod universal joint; An assembly angle condition acquisition module, wherein the assembly angle condition acquisition module acquires an assembly angle range of the bell housing and the tripod pin based on a unit value; An assembly optimization module is provided, wherein the assembly optimization module assembles the driving shaft tripod universal joint based on a first assembly condition, a second assembly condition, a third assembly condition and an assembly angle range.

8. A drive shaft tripod universal joint assembly system as claimed in claim 7, 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 joint as the unit value.

9. A drive shaft tripod universal joint assembly system as claimed in claim 7, 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 a unit value; A second assembly condition acquisition module, which determines the second assembly condition according to the 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 a unit value; A third assembly condition acquisition module is configured to determine a third assembly condition according to the requirement that the sum of the first difference and the second difference is between 0 and unity.

10. A drive shaft tripod universal joint assembly system as claimed in claim 7, 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 in which one side of the ball ring is in close contact with the corresponding slideway side wall and the other side has a clearance with the slideway as a unit value; A first angle acquisition module, wherein the first angle acquisition module takes 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 pin in the corresponding slideway as the first angle; A second angle acquisition module, wherein the second angle acquisition module takes the angle between the line between the end point of the corresponding side of the ball ring in the slideway and the axis of the drive shaft in the limit state and the axis of the tripod pin in the corresponding slideway as the second angle; A maximum assembly angle value acquisition module, wherein the maximum assembly angle value acquisition module takes the difference between the first angle and the second angle as the maximum assembly angle; The assembly angle range acquisition module uses 0 to a maximum assembly angle value as the assembly angle range.

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