Electric steering gear shell shaft sleeve press-fitting device and method for drive-by-wire chassis

Abstract

The invention discloses an electric steering gear shell shaft sleeve press-fitting device for a drive-by-wire chassis, which comprises a positioning seat, a shaft sleeve press-fitting assembly and a movable sliding press-fitting assembly, the shaft sleeve press-fitting assembly comprises an upper movable positioning assembly used for positioning a shaft sleeve needing to be assembled with the upper end of the rack shell. The lower movable positioning assembly is used for positioning a shaft sleeve which needs to be assembled with the lower end of the rack shell; the middle supporting assembly is positioned between the upper movable positioning assembly and the lower movable positioning assembly and is used for fixing the rack shell; the sliding press-fitting assembly is arranged to apply downward pressure to the shaft sleeve in the upper movable positioning assembly and apply upward pressure to the shaft sleeve in the lower movable positioning assembly. According to the electric steering gear shell shaft sleeve press-fitting device for the drive-by-wire chassis, the problem that shaft sleeves at the two ends of a rack shell need to be separately and sequentially press-fitted is solved, the working procedure is simplified, the assembling efficiency and the assembling effect of the shell and the shaft sleeves are improved, and the product quality is guaranteed. The invention further discloses an electric steering gear shell shaft sleeve press-fitting method for the drive-by-wire chassis.

Description

Technical Field

[0001] This invention belongs to the technical field of vehicle steering systems. Specifically, this invention relates to a device and method for pressing together a housing bushing of an electric steering gear for a drive-by-wire chassis. Background Technology

[0002] The press-fitting process of the bushings at both ends of the rack housing in an electric steering system refers to precisely pressing the bushings into predetermined positions on the rack housing to ensure smooth operation and stable functioning of the rack and gears, preventing significant rack runout during operation. During the assembly of the housing and bushings, strict control of the press-fitting force, press-fitting depth, and fit accuracy between the bushings and housing is required.

[0003] Existing press-fitting devices have the following disadvantages:

[0004] The existing press-fitting device presses the bushings on both sides separately and sequentially. Specifically, it means that one side of the rack housing bushing is first press-fitted on a set of tooling devices. After it is completely fixed and meets the predetermined requirements, the housing is removed and placed on another set of press-fitting devices to press-fit the other side bushing.

[0005] The assembly method described above requires a step-by-step approach, with each step demanding precise press-fitting. Therefore, this method has relatively low production efficiency, and if there is mutual influence between the two bushings (e.g., positional relationship, stress conditions), separate sequential press-fitting may not completely eliminate this influence.

[0006] It is desirable to provide an improved device and method for press-fitting the housing and bushing of an electric steering gear for a drive-by-wire chassis, particularly regarding how to improve the assembly efficiency of the housing and bushing. Summary of the Invention

[0007] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a press-fitting device for the housing and bushing of an electric steering gear for a drive-by-wire chassis, with the purpose of improving the assembly efficiency of the housing and bushing.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a bushing press-fitting device for an electric steering gear housing of a drive-by-wire chassis, comprising a positioning seat, a bushing press-fitting assembly, and a movably configured sliding press-fitting assembly. The bushing press-fitting assembly includes an upper movable positioning assembly for positioning a bushing to be assembled with the upper end of a rack housing, a lower movable positioning assembly for positioning a bushing to be assembled with the lower end of a rack housing, and an intermediate support assembly located between the upper movable positioning assembly and the lower movable positioning assembly for fixing the rack housing. The sliding press-fitting assembly is configured to apply downward pressure to the bushing in the upper movable positioning assembly and upward pressure to the bushing in the lower movable positioning assembly, respectively.

[0009] The sliding pressing assembly includes an upper sliding connecting plate, an upper sliding pressing head, a lower sliding connecting plate, and a lower sliding pressing head that move synchronously. The upper sliding pressing head is inserted into the upper movable positioning assembly, and the lower sliding pressing head is inserted into the lower movable positioning assembly.

[0010] The sliding press assembly also includes guide posts connected to the upper sliding connecting plate and the lower sliding connecting plate, and at least two guide posts are provided.

[0011] The sliding press assembly further includes an upper sensor, a lower sensor, an upper sensor connecting shaft connected to the upper sliding press head, and a lower sensor connecting shaft connected to the lower sliding press head.

[0012] The upper movable positioning component includes an upper movable base plate disposed on the positioning seat and an upper connecting positioning block disposed on the upper movable base plate. The upper connecting positioning block is provided with a positioning hole for accommodating the bushing. The upper movable base plate is located below the upper sliding connecting plate.

[0013] The lower movable positioning component includes a lower movable base plate disposed on the positioning seat and a lower connecting positioning block disposed on the lower movable base plate. The lower connecting positioning block is provided with a positioning hole for accommodating the bushing. The lower movable base plate is located above the lower sliding connecting plate.

[0014] The guide post passes through the upper movable base plate and the lower movable base plate.

[0015] The distance between the upper movable base plate and the lower movable base plate is adjustable.

[0016] A drive component is provided on the positioning seat, and the drive component is connected to the sliding press assembly.

[0017] The present invention also provides a method for press-fitting the housing bushing of an electric steering gear for a steerable chassis, which employs the aforementioned press-fitting device for the housing bushing of an electric steering gear for a steerable chassis, and includes the following steps:

[0018] S1. Place the bushing on the sliding press assembly;

[0019] S2. Fix the rack housing to the intermediate support assembly;

[0020] S3. The sliding press-fit assembly moves downward, so that the bushing on the upper movable positioning assembly is press-fitted onto the rack housing;

[0021] S4. The sliding press-fit assembly moves upward, so that the bushing on the lower movable positioning assembly is press-fitted onto the rack housing;

[0022] S5. Reset the sliding press-fit assembly and loosen the rack housing;

[0023] S6. Remove the rack housing; pressing is complete.

[0024] The electric steering gear housing bushing press-fitting device for drive-by-wire chassis of the present invention solves the problem that the bushings at both ends of the rack housing need to be pressed-fitted separately and sequentially. The device has a high degree of structural integration, which can simplify the assembly process, improve the assembly efficiency and effect of the housing and bushing, and ensure product quality. Attached Figure Description

[0025] This manual includes the following figures, which illustrate the following:

[0026] Figure 1 This is a front view of the electric steering gear housing bushing press-fitting device for drive-by-wire chassis according to the present invention;

[0027] Figure 2 This is a left view of the electric steering gear housing bushing press-fitting device for the drive-by-wire chassis of the present invention;

[0028] Figure 3 This is an isometric view of the electric steering gear housing bushing press-fitting device for the drive-by-wire chassis of the present invention;

[0029] Figure 4 It is an isometric view of the intermediate support component;

[0030] Figure 5 This is a sectional view of the electric steering gear housing bushing press-fitting device for the drive-by-wire chassis of the present invention;

[0031] Figure 6 This is a partial view of the electric steering gear housing bushing press-fitting device for the drive-by-wire chassis of the present invention;

[0032] Figure 7 This is a partial view of the electric steering gear housing bushing press-fitting device for the drive-by-wire chassis of the present invention;

[0033] The components in the diagram are labeled as follows: 1. Positioning seat; 2. Movable base; 3. Upper connecting positioning block; 4. Guide column; 5. Lower connecting positioning block; 6. Connecting seat; 7. Upper sliding connecting plate; 8. Upper sensor connecting shaft; 9. Upper sliding pressure head; 10. Intermediate support assembly; 11. Lower sliding pressure head; 12. Motor seat; 13. High-precision planetary reducer; 14. Servo motor; 15. Folding electric cylinder; 16. Upper moving base plate; 17. Lower moving base plate; 18. Rack housing; 19. Housing support seat; 20. Support base plate; 21. Support support; 22. Rotating pressure arm; 23. Rotary clamping cylinder; 24. Lower sliding connecting plate; 25. Lower sensor connecting shaft; 26. Bushing; 27. Sealing ring; 28. Force sensor. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0035] It should be noted that in the following embodiments, the terms "first," "second," and "third" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution; they are merely for the convenience of description.

[0036] like Figures 1 to 6 As shown, the present invention provides a bushing press-fitting device for an electric steering gear housing of a drive-by-wire chassis, including a positioning seat 1, a bushing press-fitting assembly, and a movably configured sliding press-fitting assembly. The bushing press-fitting assembly includes an upper movable positioning assembly for positioning a bushing 26 to be assembled with the upper end of a rack housing 18, a lower movable positioning assembly for positioning a bushing 26 to be assembled with the lower end of a rack housing 18, and an intermediate support assembly 10 located between the upper movable positioning assembly and the lower movable positioning assembly for fixing the rack housing 18. The sliding press-fitting assembly is configured to apply downward pressure to the bushing 26 in the upper movable positioning assembly and upward pressure to the bushing 26 in the lower movable positioning assembly.

[0037] Specifically, such as Figures 1 to 3 and Figure 6 As shown, the sliding press assembly is vertically movable. The sliding press assembly includes an upper sliding connecting plate 7, an upper sliding press head 9, a lower sliding connecting plate 24, and a lower sliding press head 11, which move linearly in the vertical direction simultaneously. The upper sliding press head 9 is configured to insert into the upper movable positioning assembly and apply downward pressure to the bushing 26 in the upper movable positioning assembly, so that the bushing 26 is pressed into the shaft hole at the upper end of the rack housing 18. The lower sliding press head 11 is configured to insert into the lower movable positioning assembly and apply upward pressure to the bushing 26 in the lower movable positioning assembly, so that the bushing 26 is pressed into the shaft hole at the lower end of the rack housing 18.

[0038] like Figures 1 to 3 As shown, the sliding press assembly also includes guide posts 4 fixedly connected to the upper sliding connecting plate 7 and the lower sliding connecting plate 24. At least two guide posts 4 are provided. The upper sliding connecting plate 7 is located above the lower sliding connecting plate 24. The guide posts 4 are vertically arranged. The upper movable positioning component and the lower movable positioning component are provided with guide holes for the guide posts 4 to pass through. The upper movable positioning component and the lower movable positioning component play a guiding role for the sliding press assembly, so that the sliding press assembly can only move in the vertical direction to ensure the assembly effect.

[0039] like Figures 1 to 3As shown, in this embodiment, two guide posts 4 are provided. The upper sliding head 9 and the lower sliding head 11 are located in the middle of the two guide posts 4. The upper sliding head 9 and the lower sliding head 11 are vertically arranged and coaxial.

[0040] like Figures 1 to 3 As shown, the sliding press-fit assembly also includes an upper sensor, a lower sensor, an upper sensor connecting shaft 8 connected to the upper sliding press head 9, and a lower sensor connecting shaft 25 connected to the lower sliding press head 11. The upper sensor connecting shaft 8 is mounted on the upper sliding connecting plate 7, and an upper sensor (a force sensor) is installed within it to monitor the pressing force between the rack housing 18 and the bushing 26. The lower sensor connecting shaft 25 is mounted on the lower sliding connecting plate 24, and a lower sensor (a force sensor) is installed within it to monitor the pressing force between the rack housing 18 and the bushing 26. The two sets of sensors (upper and lower) can monitor the pressing force of the bushings 26 at both ends of the rack housing 18 separately. The two sets of sensors in the same sliding press-fit assembly ensure consistency in the pressing at both ends and reduce errors that may result from individual pressing.

[0041] like Figures 1 to 3 As shown, the upper movable positioning assembly includes an upper movable base plate 16 mounted on the positioning seat 1 and an upper connecting positioning block 3 mounted on the upper movable base plate 16. The upper connecting positioning block 3 has an upper positioning hole for accommodating the bushing 26 and an upper positioning groove for the upper end of the rack housing 18 to be embedded. The upper positioning hole and the upper positioning groove are coaxially arranged, with the upper positioning hole located above the upper positioning groove. The upper positioning groove is an arc-shaped groove located at the lower end of the upper connecting positioning block 3. The diameter of the upper positioning groove is the same as the diameter of the outer diameter of the upper end of the rack housing 18, and the curvature of the upper positioning groove does not exceed 180 degrees to ensure accurate positioning of the rack housing 18. The upper movable base plate 16 is located below the upper sliding connecting plate 7. The upper connecting positioning block 3 is located below the upper movable base plate 16, and its upper end is fixedly connected to the upper movable base plate 16. The upper movable base plate 16 has a through hole for the upper sliding pressure head 9 to pass through. The arc-shaped groove positioning structure effectively limits the rack housing 18 that needs to be positioned or guided, preventing it from shifting during the press-fitting process. This arc-shaped design provides stable support and positioning points for the rack housing 18, thus ensuring accurate positioning.

[0042] like Figures 1 to 3As shown, the lower movable positioning assembly includes a lower movable base plate 17 mounted on the positioning seat 1 and a lower connecting positioning block 5 mounted on the lower movable base plate 17. The lower connecting positioning block 5 has a lower positioning hole for accommodating the bushing 26 and a lower positioning groove for the lower end of the rack housing 18 to be embedded. The lower positioning hole and the lower positioning groove are coaxially arranged. The lower positioning hole is located below the lower positioning groove. The lower positioning groove is an arc-shaped groove provided at the upper end of the lower connecting positioning block 5. The diameter of the lower positioning groove is the same as the diameter of the lower outer circle of the rack housing 18. The arc of the lower positioning groove does not exceed 180 degrees to ensure accurate positioning of the rack housing 18. The lower movable base plate 17 is located above the lower sliding connecting plate 24. The lower connecting positioning block 5 is located above the lower movable base plate 17. The lower end of the lower connecting positioning block 5 is fixedly connected to the lower movable base plate 17. The lower movable base plate 17 has a through hole for the lower sliding pressure head 11 to pass through. The upper connecting positioning block 3 and the lower connecting positioning block 5 are coaxially arranged. The upper and lower sets of arc-shaped groove positioning structures simplify the installation. During press-fitting, the upper and lower sets of arc-shaped groove positioning structures can help operators quickly position the rack housing 18 to the required position, making the installation more convenient and faster.

[0043] like Figures 1 to 3 , Figure 6 and Figure 7 As shown, the upper sensor connecting shaft 8 has a countersunk hole in its axial direction, and the force sensor is installed in the countersunk hole. The upper sensor connecting shaft 8 also has a countersunk hole in its radial direction. The bottom of the countersunk hole is a threaded hole, and the force sensor 28 is installed in the countersunk hole. The lower end of the upper sensor connecting shaft 8 is clearance-fitted with the upper end of the upper sliding pressure head 9. The upper end of the upper sliding pressure head 9 has a groove. The bolt is tightened into the groove of the upper sliding pressure head 9 through the radial threaded hole of the upper sensor connecting shaft 8. The tightening force should not be too large, and the width of the groove of the upper sliding pressure head 9 should be greater than the major diameter of the bolt, allowing the upper sliding pressure head 9 to slide. The top of the upper sliding pressure head 9 should contact the force sensor 28 inside the upper sensor connecting shaft 8. When pressing the bushing 26, the pressing force of the bushing 26 is transmitted to the force sensor through the upper sliding pressure head 9. The lower end of the upper sliding pressure head 9 is inserted into the center hole of the upper connecting positioning block 3. A countersunk hole is provided axially on the lower sensor connecting shaft 25, and the force sensor is installed in the countersunk hole. A countersunk hole is also provided radially on the lower sensor connecting shaft 25. The bottom of the countersunk hole is a threaded hole, and the force sensor 28 is installed in the countersunk hole. The lower end of the lower sensor connecting shaft 25 is clearance-fitted with the lower end of the lower sliding pressure head 11. The lower end of the lower sliding pressure head 11 is provided with a groove. The bolt is tightened into the groove of the lower sliding pressure head 11 through the radial threaded hole of the lower sensor connecting shaft 25. The tightening force should not be too large, and the width of the groove of the lower sliding pressure head 11 is larger than the major diameter of the bolt, so that the lower sliding pressure head 11 can slide. The top of the lower sliding pressure head 11 should contact the force sensor inside the lower sensor connecting shaft 25. When pressing the bushing 26, the pressing force of the bushing 26 is transmitted to the force sensor 28 through the lower sliding pressure head 11. The lower end of the lower sliding pressure head 11 is inserted into the center hole of the lower connecting positioning block 5.

[0044] like Figures 1 to 4 As shown, the upper connecting positioning block 3 and the lower connecting positioning block 5 are used to position the outer circle of the bushing 26 hole of the rack housing 18. The intermediate support assembly 10 is located between the upper connecting positioning block 3 and the lower connecting positioning block 5. The intermediate support assembly 10 includes a support base 21, a support base plate 20 disposed on the support base 21, a housing support seat 19 disposed on the support base plate 20, and a clamping device disposed on the housing support seat 19 for pressing and fixing the rack housing 18 onto the housing support seat 19. The support base is fixedly connected to the positioning base 1. The clamping device consists of a rotary clamping cylinder 23 and a rotary pressure arm 22. The rotary clamping cylinder 23 is fixedly disposed on the support base plate 20 and connected to the rotary pressure arm 22. The rotary pressure arm 22 contacts the rack housing 18. The rotary clamping cylinder 23 controls the rotary pressure arm 22 to apply pressure to the rack housing 18, thereby fixing the rack housing 18 onto the housing support seat 19. The rotary clamping cylinder 23 and the rotary pressure arm 22 can fix the rack housing 18 on the housing support 19, preventing the rack housing 18 from rotating along its axis during press-fitting and also preventing it from falling off during the press-fitting process.

[0045] like Figures 1 to 3 As shown, a drive assembly is installed on the positioning base 1, and the drive assembly is connected to the sliding pressing assembly. The drive assembly is used to control the sliding pressing assembly to move linearly in the vertical direction. The drive assembly includes a motor base 12, a reducer, a servo motor 14, and a reciprocating electric cylinder 15. The servo motor 14 is mounted on the motor base 12, which is fixedly installed. The reducer is a high-precision planetary reducer 13. The output end of the servo motor 14 is connected to the input end of the reducer, and the output end of the reducer is connected to the input end of the reciprocating electric cylinder 15. The output end of the reciprocating electric cylinder 15 is fixedly connected to the connecting seat 6. The cylinder body of the reciprocating electric cylinder 15 is fixedly connected to the upper end of the positioning base 1. The sliding pressing assembly is raised and lowered by the extension and retraction of the reciprocating electric cylinder 15. The guide column 4 passes through the upper moving base plate 16 and the lower moving base plate 17. A connecting seat 6 is installed on the uppermost upper sliding connecting plate 7. The connecting seat 6 is connected to the reciprocating electric cylinder 15 and moves with the reciprocating electric cylinder 15.

[0046] Preferably, the distance between the upper movable base plate 16 and the lower movable base plate 17 is adjustable. The upper movable base plate 16 and the lower movable base plate 17 have multiple mounting positions on the positioning seat 1. The upper movable base plate 16 and the lower movable base plate 17 are connected to the positioning seat 1 by bolts. The positioning seat 1 is provided with mounting holes for the bolts to pass through; multiple mounting holes are provided. By changing the height position of the upper movable base plate 16 and / or the lower movable base plate 17, the vertical distance between the upper movable base plate 16 and the lower movable base plate 17 can be adjusted to accommodate rack housings 18 of different lengths, thereby improving the versatility of the pressing device. For example, increasing the vertical distance between the upper movable base plate 16 and the lower movable base plate 17 can accommodate the pressing of longer rack housings 18; decreasing the vertical distance between the upper movable base plate 16 and the lower movable base plate 17 can accommodate the pressing of shorter rack housings 18.

[0047] like Figure 6 As shown, a sealing ring groove is provided on the upper sliding pressure head 9, and a sealing ring 27 is provided in the groove. When the bushing 26 is installed on the upper sliding pressure head 9, the sealing ring 27 generates a certain amount of compression, so that the bushing 26 will not fall off.

[0048] The present invention also provides a method for press-fitting a bushing of an electric steering gear housing for a drive-by-wire chassis, using the above-described structure of a press-fitting device for a bushing of an electric steering gear housing for a drive-by-wire chassis, and comprising the following steps:

[0049] S1. Place the bushing 26 on the upper movable positioning component and the lower movable positioning component;

[0050] S2. Fix the rack housing 18 to the intermediate support assembly 10;

[0051] S3. The sliding press assembly moves downward, so that the bushing 26 on the upper movable positioning assembly is press-fitted onto the rack housing 18.

[0052] S4. The sliding press assembly moves upward, so that the bushing 26 on the lower movable positioning assembly is press-fitted onto the rack housing 18.

[0053] S5. Reset the sliding press assembly and loosen the rack housing 18;

[0054] S6. Remove rack housing 18, pressing complete.

[0055] In step S1 above, the bushing 26 that needs to be assembled with the upper end of the rack housing 18 is put on the upper sliding pressure head 9, and the bushing 26 that needs to be assembled with the lower end of the rack housing 18 is put on the lower sliding pressure head 11.

[0056] In step S2 above, the rack housing 18 is positioned on the upper connecting positioning block 3 and the lower connecting positioning block 5. The clamping device works and applies pressure in the horizontal direction to the rack housing 18, pressing and fixing the rack housing 18 to the housing support base 19.

[0057] In step S3 above, the drive assembly starts to work. Through the pre-set program, the reversing electric cylinder 15 first pushes the sliding pressing assembly downward, so that the bushing 26 on the upper sliding press head 9 is pressed onto the rack housing 18. At this time, the pressing force can be read through the force sensor in the upper sensor connected shaft 8.

[0058] In step S4 above, the reversible electric cylinder 15 pulls the sliding pressing assembly upward, so that the bushing 26 on the lower sliding pressing head 11 is pressed onto the rack housing 18. At this time, the pressing force can be read through the force sensor 28 in the lower sensor connecting shaft 25.

[0059] In step S5 above, the final reversing electric cylinder 15 returns to its origin, and the clamping device releases the rack housing 18.

[0060] The present invention provides a press-fitting device and method for a housing bushing of an electric steering gear for a drive-by-wire chassis, which has the following advantages:

[0061] 1) Improved production efficiency: Traditional bushing press-fitting methods may involve pressing one bushing at a time, while this device significantly reduces press-fitting time and improves the efficiency of the entire production line. This parallel processing method allows more production tasks to be completed in the same amount of time, thereby reducing production costs.

[0062] 2) Ensuring Press-fit Quality: The press-fitting process of this device helps ensure consistency in the press-fitting at both ends. Under the control of automated or high-precision equipment, the bushings 26 at both ends can be subjected to the same or similar pressure, thereby reducing errors and imbalances that may occur due to individual press-fitting. This helps improve the overall accuracy of the rack housing 18.

[0063] 3) Simplified production process: By optimizing the press-fitting process, the press-fitting steps of the two end bushings 26 are combined into one step, which simplifies the production process and reduces waiting time and operational complexity in intermediate stages. This helps to reduce the error rate in the production process and improve overall production efficiency.

[0064] 4) Adapting to large-scale production needs: In scenarios requiring large-scale production of rack housing 18, the press-fitting process of this device can meet production needs more quickly, shorten delivery cycle, and enhance market competitiveness.

[0065] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A device for press fitting an electric power steering gear housing bushing for a by-wire chassis, characterized in that, The device comprises a positioning seat, a shaft sleeve press-fitting assembly and a movable sliding press-fitting assembly. The shaft sleeve press-fitting assembly comprises an upper movable positioning assembly for positioning a shaft sleeve to be assembled with the upper end of a rack housing, a lower movable positioning assembly for positioning a shaft sleeve to be assembled with the lower end of the rack housing, and an intermediate support assembly between the upper and lower movable positioning assemblies for fixing the rack housing. The sliding press-fitting assembly is arranged to apply downward pressure to the shaft sleeve in the upper movable positioning assembly and upward pressure to the shaft sleeve in the lower movable positioning assembly, respectively.

2. The by-wire chassis electric power steering gear housing bush press fitting device according to claim 1, characterized in that, The sliding press-fitting assembly comprises synchronously movable upper and lower sliding connecting plates, upper and lower sliding press heads, and guide columns connected to the upper and lower sliding connecting plates. The upper sliding press head is inserted into the upper movable positioning assembly, and the lower sliding press head is inserted into the lower movable positioning assembly.

3. The by-wire chassis electric power steering gear housing bush press fitting device according to claim 2, characterized in that, The sliding press-fitting assembly further comprises at least two guide columns connected to the upper and lower sliding connecting plates.

4. The by-wire chassis electric power steering gear housing bush press fitting device according to claim 2, characterized by, The sliding press-fitting assembly further comprises upper and lower sensors, and upper and lower sensor connecting shafts connected to the upper and lower sliding press heads, respectively.

5. A by-wire chassis electric power steering gear housing bush press fitting device according to claim 3 or 4, characterised in that, The upper movable positioning assembly comprises an upper movable base plate arranged on the positioning seat and upper connecting positioning blocks arranged on the upper movable base plate. The upper connecting positioning blocks are provided with positioning holes for accommodating the shaft sleeves. The upper movable base plate is located below the upper sliding connecting plate.

6. The by-wire chassis electric power steering gear housing bush press fitting device according to claim 5, characterized in that, The lower movable positioning assembly comprises a lower movable base plate arranged on the positioning seat and lower connecting positioning blocks arranged on the lower movable base plate. The lower connecting positioning blocks are provided with positioning holes for accommodating the shaft sleeves. The lower movable base plate is located above the lower sliding connecting plate.

7. The by-wire chassis electric power steering gear housing bush press fitting device of claim 6, wherein, The guide columns pass through the upper and lower movable base plates.

8. The by-wire chassis electric power steering gear housing bushing press fitting device according to claim 6, characterized by, The distance between the upper and lower movable base plates is adjustable.

9. The by-wire chassis electric power steering gear housing bushing press fitting device according to any one of claims 1 to 8, characterized by, A driving assembly is arranged on the positioning seat and connected to the sliding press-fitting assembly.

10. A method of press fitting an electric power steering gear housing bushing for a by-wire chassis, characterized in that, The device for press-fitting a shaft sleeve of a rack housing of a by-wire chassis according to any one of claims 1 to 9 comprises the following steps: S1, placing the shaft sleeve on the sliding press-fitting assembly; S2, fixing the rack housing to the intermediate support assembly; S3, moving the sliding press-fitting assembly downward to press-fit the shaft sleeve on the upper movable positioning assembly to the rack housing; S4, moving the sliding press-fitting assembly upward to press-fit the shaft sleeve on the lower movable positioning assembly to the rack housing; S5, resetting the sliding press-fitting assembly and releasing the rack housing; S6, removing the rack housing, and completing the press-fitting.

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