Input-output shaft combination and method for assembling same

Abstract

An input-output shaft combination and an assembling method thereof, which relates to the technical field of automobile electric steering devices, comprises an input shaft, an output shaft, a sliding bearing and a torsion bar, the upper end of the input shaft is integrally formed with a spline shaft, the upper end of the spline shaft is provided with a blind hole for inserting the torsion bar, the output shaft is provided with a through hole along the axial direction for penetrating the torsion bar, the upper part of the spline shaft is annularly provided with a step, the lower end of the output shaft is provided with a step surface matched with the step, the peripheral surface of the upper end of the torsion bar is provided with an upper external spline, the peripheral surface of the lower end of the torsion bar is provided with a lower external spline, the inner wall of the through hole is provided with an upper positioning hole for press-fitting and clamping the upper external spline and the inner diameter of the upper positioning hole is smaller than the inner diameter of the through hole, the inner wall of the blind hole is provided with a lower positioning hole for press-fitting and clamping the lower external spline and the inner diameter of the lower positioning hole is smaller than the inner diameter of the blind hole, and the outer wall surface of the sliding bearing is connected with the inner wall surface of the through hole in an interference fit and is matched with the spline shaft in a clearance fit. The present application can reduce the number of parts, reduce the cost and facilitate the assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile electric power steering device, and particularly discloses an input-output shaft combination and an assembling method thereof. BACKGROUND

[0002] The automobile electric power steering device usually needs to be connected with the automobile steering wheel through an input-output shaft combination to receive the torque transmitted by the automobile steering wheel to complete steering. The input-output shaft combination, as a connecting transition structure, also includes a plurality of components. In the traditional input-output shaft combination, a sliding bearing gap fit and a torsion bar are used for connection. One end of the torsion bar is connected with the input shaft through a spline shaft, and the other end is fastened with the output shaft after penetrating into the output shaft and then drilled and hinged. The assembling process is complicated, the component structure is relatively more, and the processing cost is also higher. SUMMARY

[0003] The present application aims to provide an input-output shaft combination and an assembling method thereof, which can reduce the number of components, reduce the cost, and facilitate the assembly.

[0004] In order to solve the above technical problems, the present application adopts the following technical scheme: an input-output shaft combination, comprising an input shaft, an output shaft, a sliding bearing and a torsion bar, the upper end of the input shaft is integrally formed with a spline shaft, the upper end of the spline shaft is provided with a blind hole for inserting the torsion bar, the output shaft is provided with a through hole along the axial direction for penetrating the torsion bar, the upper part of the spline shaft is provided with a step, the lower end of the output shaft is provided with a step face matched with the step, the outer surface of the upper end of the torsion bar is provided with an upper external spline, and the outer surface of the lower end of the torsion bar is provided with a lower external spline, the outer diameter of the upper external spline is larger than that of the lower external spline, the inner wall of the through hole is provided with an upper positioning hole for press-fitting and clamping the upper external spline, and the inner diameter of the upper positioning hole is smaller than that of the through hole, the inner wall of the blind hole is provided with a lower positioning hole for press-fitting and clamping the lower external spline, and the inner diameter of the lower positioning hole is smaller than that of the blind hole, the upper end of the input shaft can be inserted into the lower end of the output shaft, and the two are provided with matched stepped holes, the outer wall surface of the sliding bearing is connected with the inner wall surface of the through hole in an interference fit, and the spline shaft is matched with a gap, and the center axes of the through hole, the upper positioning hole, the blind hole and the lower positioning hole are aligned after the input shaft and the output shaft are assembled.

[0005] Preferably, the interval distance between the bottom end of the step and the bottom end of the step face is L, wherein the unit of L is mm.

[0006] In addition, the present application also provides a method for assembling the above-mentioned input-output shaft combination, which comprises the following steps:

[0007] S1, the spline shaft is sleeved in the cylindrical first clamping body.

[0008] S2, the lower part of the output shaft is sleeved in a cylindrical second clamp body.

[0009] S3, the workpiece obtained in S1 is sleeved in a positioning sleeve, the outer wall surface of the first clamp body is positioned against the inner hole surface of the positioning sleeve, and the first positioning groove symmetrically arranged on the outer wall of the first clamp body is aligned with the directional key in the positioning sleeve.

[0010] S4, the workpiece obtained in S2 is sleeved in the positioning sleeve, the lower end of the output shaft sleeves the spline shaft, at this time, the second clamp body extends into the positioning sleeve and abuts against the end surface of the first clamp body, the outer wall surface of the second clamp body is positioned against the inner hole surface of the positioning sleeve, and the second positioning groove symmetrically arranged on the outer wall of the second clamp body is aligned with the directional key in the positioning sleeve.

[0011] S5, the torsion rod is sleeved in the assembly obtained in S4, the lower end of the torsion rod penetrates into the through hole and extends into the blind hole, and then the obtained assembly is fixed as a whole.

[0012] S6, the assembly obtained in S5 is sleeved with a limiting sleeve, wherein the limiting sleeve is sleeved on the upper part of the output shaft, the limiting sleeve is provided with an adjusting bolt, the bottom end of the adjusting bolt extends into the through hole and abuts against the upper end surface of the torsion rod.

[0013] S7, the limiting sleeve and the adjusting bolt are pressed down by using an oil press, so that the adjusting bolt pushes the torsion rod to move downward, and the upper external spline is clamped into the upper positioning hole and the lower external spline is clamped into the lower positioning hole at the same time.

[0014] S8, the tooling obtained in S7 is unloaded, the limiting sleeve, the adjusting bolt, the positioning sleeve, the first clamp body and the second clamp body are removed, and the assembled input and output shaft combination is obtained.

[0015] Preferably, in the S1 step, first, the first clamping body is loaded from the lower end of the input shaft upwards and is abutted against the step provided on the peripheral surface of the spline shaft, and then the first angle plate is loaded from the upper end of the input shaft and is abutted against the step, wherein two first angle pins are symmetrically provided on the first angle plate on both sides of the spline shaft, a first strip-shaped through hole is provided in the center of the first angle plate and matches the profile of the peripheral surface of the spline shaft, the center line direction of the two first angle pins is consistent with the length direction of the first strip-shaped through hole, two first positioning grooves for inserting the corresponding first angle pins are symmetrically provided on the side wall of the first clamping body, a first tight screw for fixing the first clamping body on the spline shaft is radially provided on the side wall of the first clamping body, the number of the first tight screw is two and is symmetrically provided on the side wall of the first clamping body, by adjusting the first clamping body to make the first angle pins inserted into the corresponding first positioning grooves, then tightening the first tight screw, and then disassembling the first angle plate, the first clamping body can be fixed on the spline shaft at a preset assembly angle.

[0016] More preferably, in the S2 step, first, the second clamping body is loaded from the lower end of the output shaft upwards and is abutted against the second boss provided on the peripheral surface of the output shaft, and then the second angle plate is loaded from the lower end of the output shaft, the middle part of the second angle plate is provided with a directional shaft for inserting into the output shaft, and the second angle plate can be abutted against the bottom end surface of the output shaft, wherein two second angle pins are symmetrically provided on the second angle plate on both sides of the output shaft, a second strip-shaped through hole matching the first strip-shaped through hole is provided in the middle part of the second angle plate, a protruding part matching the second strip-shaped through hole is provided on the upper part of the directional shaft, the center line direction of the two second angle pins is consistent with the length direction of the second strip-shaped through hole, two second positioning grooves for inserting the corresponding second angle pins are symmetrically provided on the side wall of the second clamping body, a second tight screw for fixing the second clamping body on the output shaft is radially provided on the side wall of the second clamping body, the number of the second tight screw is two and is symmetrically provided on the side wall of the second clamping body, by adjusting the second clamping body to make the second angle pins inserted into the corresponding second positioning grooves, then tightening the second tight screw, and then disassembling the second angle plate, the second clamping body can be fixed on the output shaft at a preset assembly angle.

[0017] More preferably, the interval between the adjacent first positioning grooves and the first tight screw on the side wall of the first clamping body is 90 degrees; the interval between the adjacent second positioning grooves and the second tight screw on the side wall of the second clamping body is 90 degrees.

[0018] More preferably, the length of the positioning sleeve matches the total length of the first clamping body and the second clamping body.

[0019] More preferably, in the S7 step, when the upper outer spline and the lower outer spline are completely clamped into the corresponding upper positioning hole and the lower positioning hole, the bottom end of the limiting sleeve can abut against the shaft shoulder of the output shaft.

[0020] The present application has the beneficial effects that: by integrally forming the spline shaft with the input shaft, and by using the outer spline at both ends of the torsion bar to cooperate with the input shaft and the output shaft, the drilling and reaming processes are omitted, thereby reducing the number of parts, tools and assembly processes, reducing the cost, and improving the production efficiency; and by first installing the first clamping body and the second clamping body on the input shaft and the output shaft respectively, and then assembling the two assemblies into the positioning sleeve, the torsion bar can be easily pressed and assembled, so that the assembly process also becomes more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of the overall structure of the input shaft in the embodiment;

[0023] Figure 3 It is a schematic diagram of the top view structure of the input shaft in the embodiment;

[0024] Figure 4 It is a schematic diagram of the overall structure of the output shaft in the embodiment;

[0025] Figure 5 It is a schematic diagram of the overall structure of the sliding bearing in the embodiment;

[0026] Figure 6 It is a schematic diagram of the overall structure of the torsion bar in the embodiment;

[0027] Figure 7 It is a schematic diagram of the structure when the input shaft installs the first clamping body and the first angle fixing plate in the embodiment;

[0028] Figure 8 It is a schematic diagram of the structure when the input shaft installs the first clamping body and the first angle fixing plate in the embodiment from another perspective;

[0029] Figure 9 It is a schematic diagram of the structure when the output shaft installs the second clamping body and the second angle fixing plate in the embodiment;

[0030] Figure 10 It is a schematic diagram of the structure when the output shaft installs the second clamping body and the second angle fixing plate in the embodiment from another perspective;

[0031] Figure 11 It is a schematic diagram of the structure when the input shaft with the first clamping body and the output shaft with the second clamping body are assembled into the positioning sleeve, and the torsion bar is pressed to form an assembly in the embodiment

[0032] Figure 12 For Figure 11 The schematic view of the sectional structure of A-A direction.

[0033] The reference signs are:

[0034] 1 - input shaft 2 - output shaft 2a - through hole

[0035] 2b - stepped surface 2c - shaft shoulder 3 - torsion bar

[0036] 3a - upper outer spline 3b - lower outer spline 4 - spline shaft

[0037] 4a - blind hole 4b - step 5 - upper positioning hole

[0038] 6 - lower positioning hole 7 - sliding bearing 8 - first clamping body

[0039] 8a - first positioning groove 8b - first set screw 9 - second clamping body

[0040] 9a - second positioning groove 9b - second set screw 10 - positioning sleeve

[0041] 11 - limiting sleeve 12 - adjusting bolt 13 - first angular plate

[0042] 13a - first angular pin 14 - second angular plate

[0043] 14a - second angular pin 14b - directional shaft 15 - worm wheel

[0044] 16 - directional key. DETAILED DESCRIPTION

[0045] For the convenience of the understanding of those skilled in the art, the present application is further described below in conjunction with the embodiments and the drawings, and the content mentioned in the embodiments is not a limitation to the present application.

[0046] It needs to be stated in advance that, in the present application, unless there is an explicit provision and limitation, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0047] Furthermore, in the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. The first feature is "below", "under" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature. The terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0048] As shown in Figures 1-6 An input-output shaft combination includes an input shaft 1, an output shaft 2, a sliding bearing 7 and a torsion bar 3. The upper end of the input shaft 1 is integrally formed with a spline shaft 4. The upper end of the spline shaft 4 is provided with a blind hole 4a for inserting the torsion bar 3. The output shaft 2 is provided with a through hole 2a along the axial direction for the torsion bar 3 to pass through. The upper part of the spline shaft 4 is annularly provided with a step 4b. The lower end of the output shaft 2 is provided with a step surface 2b matched with the step 4b. The peripheral surface of the upper end of the torsion bar 3 is provided with an upper external spline 3a, and the peripheral surface of the lower end of the torsion bar 3 is provided with a lower external spline 3b. The outer diameter of the upper external spline 3a is larger than the outer diameter of the lower external spline 3b. The inner wall of the through hole 2a is provided with an upper positioning hole 5 for press-fitting and clamping the upper external spline 3a, and the inner diameter of the upper positioning hole 5 is smaller than the inner diameter of the through hole 2a. The inner wall of the blind hole 4a is provided with a lower positioning hole 6 for press-fitting and clamping the lower external spline 3b, and the inner diameter of the lower positioning hole 6 is smaller than the inner diameter of the blind hole 4a. The upper end of the input shaft 1 can be inserted into the lower end of the output shaft 2, and both are provided with matched stepped holes. The outer wall surface of the sliding bearing 7 is connected with the inner wall surface of the through hole 2a by interference fit and is in clearance fit with the spline shaft 4. After the input shaft 1 and the output shaft 2 are assembled, the center axes of the through hole 2a, the upper positioning hole 5, the blind hole 4a and the lower positioning hole 6 are aligned.

[0049] The input-output shaft combination provided by the above-mentioned embodiment can reduce the number of parts, tools and assembly processes, reduce costs and improve production efficiency by integrally forming the spline shaft 4 with the input shaft 1 and using external splines at both ends of the torsion bar 3 to match with the input shaft 1 and the output shaft 2, thereby eliminating drilling and reaming processes.

[0050] Preferably, the interval distance between the bottom end of the step 4b and the bottom end of the step surface 2b is L, wherein the unit of L is mm.

[0051] As more preferably, the outer diameter of the upper external spline 3a is D and the outer diameter of the lower external spline 3b is d, wherein d:D = 1:1.0375.

[0052] In addition, as shown in Figures 7-12 the embodiment also provides a method for assembling the input-output shaft combination, comprising the following steps:

[0053] S1, sleeving the spline shaft 4 in the cylindrical first clamping body 8.

[0054] S2, sleeving the lower part of the output shaft 2 in the cylindrical second clamping body 9.

[0055] S3, loading the workpiece obtained in the S1 step into a positioning sleeve 10, so that the outer wall surface of the first clamping body 8 abuts against the inner hole surface of the positioning sleeve 10 for positioning, and the first positioning groove 8a symmetrically arranged on the outer wall of the first clamping body 8 is aligned with the directional key 16 in the positioning sleeve 10 for angular positioning.

[0056] S4, loading the workpiece obtained in the S2 step into the positioning sleeve 10, so that the lower end of the output shaft 2 sleeves the spline shaft 4, at this time the second clamping body 9 extends into the positioning sleeve 10 and abuts against the end surface of the first clamping body 8, and the outer wall surface of the second clamping body 9 abuts against the inner hole surface of the positioning sleeve 10 for positioning, and the second positioning groove 9a symmetrically arranged on the outer wall of the second clamping body 9 is aligned with the directional key 16 in the positioning sleeve 10 for angular positioning.

[0057] S5, loading the torsion bar 3 into the assembly obtained in the S4 step, the lower end of the torsion bar 3 penetrates into the through hole 2a and extends into the blind hole 4a, and then the obtained assembly is fixed as a whole.

[0058] S6, sleeving the limiting sleeve 11 to the assembly obtained in the S5 step, wherein the limiting sleeve 11 is sleeved on the upper part of the output shaft 2, the limiting sleeve 11 is provided with an adjusting bolt 12, the bottom end of the adjusting bolt 12 extends into the through hole 2a and abuts against the upper end surface of the torsion bar 3.

[0059] S7, using an oil press to press the limiting sleeve 11 and the adjusting bolt 12, so that the adjusting bolt 12 pushes the torsion bar 3 to move downward, and then the upper external spline 3a is clamped into the upper positioning hole 5 and at the same time the lower external spline 3b is clamped into the lower positioning hole 6.

[0060] S8, discharging the workpiece obtained in the S7 step, and removing the limiting sleeve 11, the adjusting bolt 12, the positioning sleeve 10, the first clamping body 8 and the second clamping body 9, so as to obtain the assembled input-output shaft combination.

[0061] As preferred, in the S1 step, the first clamping body 8 is first assembled from the lower end of the input shaft 1 upwards and abuts against the step 4b provided on the peripheral surface of the spline shaft 4, and the spacing between the upper end surface of the first clamping body 8 and the upper end surface of the step 4b is also L, then the first angular plate 13 is assembled from the upper end of the input shaft 1, and the first angular plate 13 abuts against the step 4b, wherein two first angular pins 13a are symmetrically provided on the first angular plate 13 located on both sides of the spline shaft 4, a first strip-shaped through hole is provided in the center of the first angular plate 13 and matches the profile of the peripheral surface of the spline shaft 4, the center line direction of the two first angular pins 13a is consistent with the length direction of the first strip-shaped through hole, two first positioning grooves 8a are symmetrically provided on the side wall of the first clamping body 8 for the corresponding first angular pins 13a to be inserted, and first tightening screws 8b are radially provided on the side wall of the first clamping body 8 for fixing the first clamping body 8 on the spline shaft 4, the number of the first tightening screws 8b is two and they are symmetrically provided on the side wall of the first clamping body 8, by adjusting the first clamping body 8 so that the first angular pins 13a are inserted into the corresponding first positioning grooves 8a, then the first tightening screws 8b are tightened, and then the first angular plate 13 is disassembled, the first clamping body 8 can be fixed on the spline shaft 4 at a predetermined assembly angle.

[0062] As more preferred, in the S2 step, the second clamping body 9 is first assembled from the lower end of the output shaft 2 upwards and abuts against the second boss provided on the peripheral surface of the output shaft 2, then the second angular plate 14 is assembled from the lower end of the output shaft 2, the directional shaft 14b is provided in the middle of the second angular plate 14 for insertion into the output shaft 2, and the second angular plate 14 can abut against the bottom end surface of the output shaft 2, wherein two second angular pins 14a are symmetrically provided on the second angular plate 14 located on both sides of the output shaft 2, a second strip-shaped through hole is provided in the middle of the second angular plate 14 and matches the first strip-shaped through hole, the upper part of the directional shaft 14b is provided with a protruding part matched with the second strip-shaped through hole, the center line direction of the two second angular pins 14a is consistent with the length direction of the second strip-shaped through hole, two second positioning grooves 9a are symmetrically provided on the side wall of the second clamping body 9 for the corresponding second angular pins 14a to be inserted, and second tightening screws 9b are radially provided on the side wall of the second clamping body 9 for fixing the second clamping body 9 on the output shaft 2, the number of the second tightening screws 9b is two and they are symmetrically provided on the side wall of the second clamping body 9, by adjusting the second clamping body 9 so that the second angular pins 14a are inserted into the corresponding second positioning grooves 9a, then the second tightening screws 9b are tightened, and then the second angular plate 14 is disassembled, the second clamping body 9 can be fixed on the output shaft 2 at a predetermined assembly angle.

[0063] By the positioning mode, the first and second clamping bodies 8 and 9 can be easily fixed at a preset assembly angle, so that the input shaft 1 and the output shaft 2 can be quickly connected after alignment.

[0064] As more preferably, the first positioning groove 8a and the first fastening screw 8b on the side wall of the first clamping body 8 are spaced 90 degrees apart; the second positioning groove 8a and the second fastening screw 9b on the side wall of the second clamping body 9 are spaced 90 degrees apart.

[0065] As more preferably, the length of the positioning sleeve 10 matches the total length of the first and second clamping bodies 8 and 9.

[0066] In addition, in the embodiment, as more preferably, when the upper and lower outer splines 3a and 3b are completely clamped into the corresponding upper and lower positioning holes 5 and 6, the bottom end of the limiting sleeve 11 can abut against the shaft shoulder 2c of the output shaft 1, so that the function of prompting the completion of the press fitting is achieved, and the over-pressing of the outer splines is prevented.

[0067] The method for assembling the input and output shaft combination provided in the above embodiment can easily press the torsion bar 3 by first installing the first and second clamping bodies 8 and 9 on the input shaft 1 and the output shaft 2 respectively, and then assembling the two assemblies into the positioning sleeve 10, so that the assembly process is more convenient.

[0068] The above embodiment is a preferred implementation scheme of the present application, in addition to this, the present application can also be implemented in other ways, and any obvious replacement without departing from the technical scheme concept is within the protection scope of the present application.

[0069] In order to make the person skilled in the art more conveniently understand the improvement of the present application over the prior art, some drawings and descriptions of the present application have been simplified, and some other elements have been omitted in the present application file for the sake of clarity, and the person skilled in the art should be aware that these omitted elements can also constitute the content of the present application.

Claims

1. An input-output shaft combination comprising an input shaft (1), an output shaft (2), a plain bearing (7) and a torsion bar (3), characterized in that: The upper end of the input shaft (1) is integrally formed with a spline shaft (4), the upper end of the spline shaft (4) is provided with a blind hole (4a) for inserting a torsion bar (3), the output shaft (2) is provided with a through hole (2a) for penetrating the torsion bar (3) along the axial direction, the upper part of the spline shaft (4) is annularly provided with a step (4b), the lower end of the output shaft (2) is provided with a step face (2b) matched with the step (4b), the peripheral surface of the upper end of the torsion bar (3) is provided with an upper external spline (3a), the peripheral surface of the lower end of the torsion bar (3) is provided with a lower external spline (3b), the outer diameter of the upper external spline (3a) is larger than the outer diameter of the lower external spline (3b), the inner wall of the through hole (2a) is provided with an upper positioning hole (5) for press-fitting and clamping the upper external spline (3a) and the inner diameter of the upper positioning hole (5) is smaller than the inner diameter of the through hole (2a), the inner wall of the blind hole (4a) is provided with a lower positioning hole (6) for press-fitting and clamping the lower external spline (3b) and the inner diameter of the lower positioning hole (6) is smaller than the inner diameter of the blind hole (4a), the upper end of the input shaft (1) can be inserted into the lower end of the output shaft (2) and both are provided with matched stepped holes, the outer wall surface of the sliding bearing (7) is connected with the inner wall surface of the through hole (2a) in an interference fit and is in clearance fit with the spline shaft (4), the center axes of the through hole (2a), the upper positioning hole (5), the blind hole (4a) and the lower positioning hole (6) are aligned after the input shaft (1) and the output shaft (2) are assembled; When assembled, the following steps are included: S1, a first clamping body (8) in a cylindrical shape is sleeved on the spline shaft (4); S2, a second clamping body (9) in a cylindrical shape is sleeved on the lower part of the output shaft (2); S3, the workpiece obtained in the step S1 is loaded into a positioning sleeve (10), so that the outer wall surface of the first clamping body (8) is positioned against the inner hole surface of the positioning sleeve (10), and the first positioning groove (8a) symmetrically arranged on the outer wall of the first clamping body (8) is aligned with the directional key (16) in the positioning sleeve (10) to determine the angular direction; S4, the workpiece obtained in the step S2 is loaded into the positioning sleeve (10), so that the lower end of the output shaft (2) sleeves the spline shaft (4), at this time, the second clamping body (9) extends into the positioning sleeve (10) and abuts against the end face of the first clamping body (8), and the outer wall surface of the second clamping body (9) is positioned against the inner hole surface of the positioning sleeve (10), and the second positioning groove (9a) symmetrically arranged on the outer wall of the second clamping body (9) is aligned with the directional key (16) in the positioning sleeve (10) to determine the angular direction; S5, the torsion bar (3) is loaded into the assembly obtained in the step S4, the lower end of the torsion bar (3) penetrates the through hole (2a) and extends into the blind hole (4a), and then the obtained assembly is fixed as a whole. S6, limit the assembly set obtained in the S5 step, wherein the limit sleeve (11) is sleeved on the upper part of the output shaft (2), the limit sleeve (11) is provided with an adjusting bolt (12), the bottom end of the adjusting bolt (12) extends into the through hole (2a) and abuts against the upper end surface of the torsion bar (3); S7, using an oil press to press down the limit sleeve (11) and the adjusting bolt (12), so that the adjusting bolt (12) pushes the torsion bar (3) to move downward, and the upper outer spline (3a) is clamped into the upper positioning hole (5), and the lower outer spline (3b) is clamped into the lower positioning hole (6) at the same time; S8, the workpiece obtained in the S7 step is unloaded, and the limit sleeve (11), the adjusting bolt (12), the positioning sleeve (10), the first clamping body (8) and the second clamping body (9) are removed, that is, the assembled input and output shaft combination is obtained.

2. The input-output shaft combination of claim 1, wherein: The interval distance between the bottom end of the step (4b) and the bottom end of the step surface (2b) is L, wherein the unit of L is mm.

3. The input-output shaft combination of claim 1, wherein: In the S1 step, the first clamping body (8) is first loaded from the lower end of the input shaft (1) upward and abuts against the step (4b) arranged on the peripheral surface of the spline shaft (4), and then the first angle plate (13) is loaded from the upper end of the input shaft (1) and abuts against the step (4b), wherein two first angle pins (13a) are symmetrically arranged on the first angle plate (13) located on both sides of the spline shaft (4), a first strip-shaped through hole is arranged in the center of the first angle plate (13) and matched with the contour of the peripheral surface of the spline shaft (4), the center line direction of the two first angle pins (13a) is consistent with the length direction of the first strip-shaped through hole, two first positioning grooves (8a) are symmetrically arranged on the side wall of the first clamping body (8) for inserting the corresponding first angle pins (13a), and a first locking screw (8b) is arranged on the side wall of the first clamping body (8) for fixing the first clamping body (8) on the spline shaft (4), the number of the first locking screw (8b) is two and symmetrically arranged on the side wall of the first clamping body (8), by adjusting the first clamping body (8) to make the first angle pins (13a) inserted into the corresponding first positioning grooves (8a), then the first locking screw (8b) is tightened, and then the first angle plate (13) is removed, the first clamping body (8) can be fixed on the spline shaft (4) at a preset assembly angle.

4. The input-output shaft combination of claim 3, wherein: In the S2 step, the second clamping body (9) is first loaded from the lower end of the output shaft (2) upwards and abuts against the second boss provided on the peripheral surface of the output shaft (2), and then the second angular orientation plate (14) is continuously loaded from the lower end of the output shaft (2), the middle part of the second angular orientation plate (14) is provided with a directional shaft (14b) for insertion into the output shaft (2), the second angular orientation plate (14) can abut against the bottom end surface of the output shaft (2), wherein two second angular orientation pins (14a) are symmetrically provided on the second angular orientation plate (14) on both sides of the output shaft (2), the middle part of the second angular orientation plate (14) is provided with a second strip-shaped through hole matched with the first strip-shaped through hole, the upper part of the directional shaft (14b) is provided with a protrusion matched with the second strip-shaped through hole, the center line direction of the two second angular orientation pins (14a) is consistent with the length direction of the second strip-shaped through hole, two second positioning grooves (9a) for inserting the corresponding second angular orientation pins (14a) are symmetrically provided on the side wall of the second clamping body (9), the second clamping body (9) is further provided with two second locking screws (9b) for fixing the second clamping body (9) on the output shaft (2) in the radial direction, the number of the second locking screws (9b) is two and they are symmetrically provided on the side wall of the second clamping body (9), by adjusting the second clamping body (9) to make the second angular orientation pins (14a) inserted into the corresponding second positioning grooves (9a), then the second locking screws (9b) are tightened, and then the second angular orientation plate (14) is disassembled, the second clamping body (9) can be fixed on the output shaft (2) at a preset assembled angular orientation.

5. The input-output shaft combination of claim 4, wherein: The interval between the first positioning groove (8a) and the first locking screw (8b) adjacent to each other on the side wall of the first clamping body (8) is 90 degrees; the interval between the second positioning groove (8a) and the second locking screw (9b) adjacent to each other on the side wall of the second clamping body (9) is 90 degrees.

6. The input-output shaft combination of claim 4, wherein: The length of the positioning sleeve (10) matches the total length of the first clamping body (8) and the second clamping body (9).

7. The input-output shaft combination of claim 4, wherein: In the S7 step, when the upper external spline (3a) and the lower external spline (3b) are completely clamped into the corresponding upper positioning hole (5) and the lower positioning hole (6), the bottom end of the limiting sleeve (11) can abut against the shaft shoulder (2c) of the output shaft (2).

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