Steering engine assembly puller device

Abstract

The invention discloses a puller device for steering engine assembly. The device comprises a symmetry degree tool, a hydraulic assembly, a mounting plate and a two-stage two-claw puller, wherein the hydraulic assembly comprises a hydraulic pump and a pressure head connected with the hydraulic pump; the two-stage two-claw puller comprises an outer side two-claw puller and an inner side two-claw puller; by adopting the components, the relative position precision between the output shaft and the mounting plate in the steering engine assembly is remarkably improved, and the high-precision assembly requirement that the symmetry error is controlled within an extremely small range can be met; the hand-operated hydraulic pump is matched with the pressure release valve to form a stable and reliable hydraulic driving system, stable and uniform force can be provided when a symmetry degree tool is pressed in or disassembled, and assembly errors caused by uneven stress are reduced. The outer side two-claw puller and the inner side two-claw puller are used for accurately clamping a mounting plate boss and a symmetry degree tool positioning lug respectively, multi-point fixing and guiding are achieved, and therefore the stability and repeatability of the whole assembling process are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of mechanical assembly technology, and more specifically, to a servo motor assembly puller device. Background Technology

[0002] Servo assemblies typically include a motor controller, motor assembly, angular displacement sensor, and worm gear reducer. In traditional manufacturing processes, the symmetry between the output shaft of the worm gear reducer and the mounting plate reference must be controlled within 0.15mm to ensure the connection accuracy between the servo and the servo stick. However, in existing technologies, the mounting plate and the output shaft of the worm gear reducer are fixed with M6 screws. Due to the large tolerance of the screw holes (hole diameter 6.5, hole spacing 43±0.1), direct assembly makes it difficult to guarantee the symmetry between the output shaft and the mounting plate's reference A. Therefore, a dedicated symmetry fixture is required. However, traditional methods, such as hammering or screwing, have the following drawbacks: 1. Hammering assembly can easily lead to tooling deformation or damage to servo components; 2. The tooling assembly and disassembly are inefficient and require labor-intensive operation; 3. Symmetry tolerance is difficult to control stably.

[0003] Therefore, there is an urgent need for a dedicated device that can achieve high-precision assembly and is easy to operate. Summary of the Invention

[0004] This invention provides a servo motor assembly puller device to solve the problems of non-compliant symmetry tolerances and inconvenient disassembly and assembly of symmetry tooling in the prior art.

[0005] To achieve the above objectives, the present invention provides a servo motor assembly puller device, comprising: a symmetry fixture for installation in an annular groove of the output shaft of a servo motor assembly; a hydraulic assembly including a hydraulic pump and a pressure head connected to the hydraulic pump; the pressure head for pressing the symmetry fixture into the servo motor assembly; a mounting plate for placement on the servo motor assembly and fixed connection thereto, the mounting plate having mounting holes for the symmetry fixture to pass through, thereby installing the symmetry fixture in the annular groove; and a dual-stage two-jaw puller including an outer two-jaw puller and an inner two-jaw puller; the dual-stage two-jaw puller is mounted on a fixed plate and can slide left and right along the fixed plate, for pressing and pulling the symmetry fixture out of the servo motor assembly; the fixed plate is sleeved around the extension shaft of the hydraulic pump.

[0006] Optionally, the symmetry fixture includes a cylinder and a positioning ear; the cylinder is an annular structure with a closed top and an open bottom; the positioning ear is fixedly disposed on the outer wall of the cylinder and close to the closed side of the cylinder.

[0007] Optionally, the outer diameter tolerance of the symmetry tooling is within the range of (0, -0.1) mm, and the inner diameter tolerance of the symmetry tooling is within the range of (+0.1, 0) mm.

[0008] Optionally, the inner two-jaw puller is disposed inside the outer two-jaw puller, the inner two-jaw puller being used to clamp the positioning ear of the symmetry tooling; the outer two-jaw puller being used to clamp the boss of the servo assembly on the bottom side of the mounting plate.

[0009] Optionally, two positioning ears are provided, located on both sides of the cylinder respectively; two outer two-claw pullers are provided, installed on the left and right outer sides of the fixing plate respectively; and two inner two-claw pullers are provided, installed on the left and right inner sides of the fixing plate respectively.

[0010] Optionally, a limiting screw is provided on the positioning plate and on the outside of the outer two-jaw puller.

[0011] Optionally, the pressure head has through holes on both sides. When the symmetry tooling is pulled out of the servo assembly, the through holes correspond to the positioning ears of the symmetry tooling. When the symmetry tooling is pressed into the servo assembly, the through holes are perpendicular to the positioning ears of the symmetry tooling.

[0012] Optionally, it may also include: a placement platform; the placement platform is used to place the servo assembly.

[0013] Optionally, the mounting plate is fixedly connected to the servo assembly by a plurality of M6 screws.

[0014] Optionally, the hydraulic pump is a hand-cranked hydraulic pump; the hydraulic pump is equipped with a pressure relief valve to release the pressure of the hydraulic pump.

[0015] The beneficial effects of this invention are: This invention provides a servo motor assembly puller device. This device employs key components such as symmetrical tooling, precision-machined hydraulic components, and a two-stage two-jaw puller, significantly improving the relative positional accuracy between the output shaft and the mounting plate in the servo motor assembly. This meets the high-precision assembly requirements of controlling symmetry errors within an extremely small range (e.g., within 0.15mm). A hand-cranked hydraulic pump, combined with a pressure relief valve, forms a stable and reliable hydraulic drive system that provides smooth and uniform force when pressing in or removing the symmetrical tooling, reducing assembly errors caused by uneven force. The outer and inner two-jaw pullers precisely clamp the mounting plate boss and the symmetrical tooling positioning ears, respectively, achieving multi-point fixing and guidance, thereby greatly improving the stability and repeatability of the entire assembly process. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the servo motor assembly puller device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the assembly structure of the servo motor component and the symmetry tooling provided in the embodiment of the present invention; Figure 3 This is a schematic diagram of the symmetry tooling provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the pressure head provided in an embodiment of the present invention.

[0017] Symbol explanation: Symmetry fixture-1, hydraulic pump-2, pressure head-3, mounting plate-4, outer two-jaw puller-5, inner two-jaw puller-6, fixing plate-7, servo assembly-8, placement platform-9, M6 screw-10, cylinder-11, positioning lug-12, through hole-31, limit screw-71, annular groove-81. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0019] Figure 1 This is a schematic diagram of the servo motor assembly puller device provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the device includes: 1. Symmetry fixture 1, used for installation in the annular groove 81 of the output shaft of the servo assembly 8; Figure 2 This is a schematic diagram of the assembly of the servo motor assembly 8 and the symmetry tooling 1 provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the symmetry tooling 1 provided in an embodiment of the present invention; as shown... Figure 2 and Figure 3 As shown, the main function of the symmetry fixture 1 is to ensure that the relative position between the output shaft of the servo assembly 8 and the mounting plate 4 meets the predetermined symmetry requirements during the servo assembly process. By accurately installing the symmetry fixture 1 in the annular groove 81 of the output shaft, it can serve as a positioning reference during subsequent assembly or fastening processes, thereby ensuring the overall assembly accuracy.

[0020] The output shaft of the servo assembly 8 includes an annular groove 81 and a circular shaft. The circular shaft is located inside the annular groove 81 and has a certain distance from the annular groove 81, so that the symmetry fixture 1 can be installed between the annular groove 81 and the circular shaft. The height of the circular shaft is greater than the height of the annular groove 81.

[0021] In an optional embodiment, the symmetry fixture 1 includes a cylinder 11 and a positioning ear 12; the cylinder 11 is an annular structure with a closed top and an open bottom; the positioning ear 12 is fixedly disposed on the outer side wall of the cylinder 11 and close to the closed side of the cylinder 11.

[0022] The cylinder 11 has an annular structure, which makes the entire symmetry fixture 1 have a continuous circular appearance, matching the annular groove 81 of the output shaft of the servo assembly 8, ensuring accurate insertion during assembly. The top of the cylinder 11 is closed, which provides stable support during pressing and prevents impurities or liquids from entering the interior of the symmetry fixture 1, thereby maintaining the structural integrity and working accuracy of the symmetry fixture 1. The bottom of the cylinder 11 is open, which facilitates the smooth insertion of the symmetry fixture 1 into the annular groove 81 of the output shaft of the servo assembly 8, ensuring that the symmetry fixture 1 can smoothly enter the predetermined position during pressing, and also facilitating subsequent removal operations.

[0023] In one optional embodiment, the outer diameter tolerance of the symmetry tooling is in the range of (0, -0.1) mm, and the inner diameter tolerance of the symmetry tooling is in the range of (+0.1, 0) mm.

[0024] “(0, -0.1) mm, (+0.1, 0) mm” indicates that the allowable deviation of the dimensions of the symmetry fixture 1 is asymmetrical. That is, after processing, the actual inner and outer diameters of the symmetry fixture 1 shall not exceed the design nominal values, and the allowable limit dimensions may be lower than the nominal values ​​by a maximum of 0.1 mm.

[0025] Since the servo assembly 8 requires a high degree of symmetry between the output shaft and the mounting plate 4, i.e., it must be controlled within 0.15mm, the inner and outer diameters of the symmetry fixture 1 directly affect the fit between the mounting plate 4 and the annular groove 81 of the output shaft. If the dimensions of the symmetry fixture 1 exceed the nominal value, it may be too tight to be inserted properly; if it is more than 0.1mm below the nominal value, the positioning accuracy may be affected due to excessive clearance.

[0026] 2. A hydraulic assembly, including: a hydraulic pump 2 and a pressure head 3 connected to the hydraulic pump 2; the pressure head 3 is used to press the symmetry tooling 1 into the servo assembly 8; The hydraulic pump 2, as a power-providing component, is characterized by its ability to generate sufficiently stable hydraulic pressure. The hydraulic pump 2 has a stroke of 55mm and a rated force of 5 tons, thereby ensuring that the applied force is stable and uniform when pressing in the symmetry tooling 1.

[0027] The pressure head 3 is connected to the hydraulic pump 2 and is used to accurately and smoothly press the symmetry fixture 1 into the servo assembly 8. With the constant pressure generated by the hydraulic pump 2, the pressure head 3 can overcome the resistance caused by assembly gaps or friction of the fixture itself, so that the symmetry fixture 1 reaches the predetermined depth when inserted.

[0028] Furthermore, the bottom of the extension shaft of the hydraulic pump 2 is provided with a threaded hole for the screw at the top of the pressure head 3 to pass through, thereby making the pressure head 3 and the hydraulic pump 2 threadedly fixedly connected.

[0029] 3. Mounting plate 4, used to be placed on the servo assembly 8 and fixedly connected to the servo assembly 8. The mounting plate 4 is provided with mounting holes for the symmetry tooling 1 to pass through so that the symmetry tooling 1 is installed in the annular groove 81. Mounting plate 4 has pre-set mounting holes to allow the symmetry fixture 1 to pass through the mounting holes and ultimately be installed in the annular groove 81 of the output shaft of the servo assembly 8. This design not only serves a positioning function but also ensures a clear insertion path for the symmetry fixture 1, reducing errors that may be caused by manual operation.

[0030] In an optional embodiment, the mounting plate 4 is fixedly connected to the servo assembly 8 by a plurality of M6 screws 10. The M6 ​​screws 10 generally conform to the GB / T70.1 standard, with a common specification of M6×16, i.e., a screw diameter of 6mm and a length of 16mm. The screw material is typically stainless steel, ensuring sufficient mechanical strength and good corrosion resistance to meet the various operating conditions required for the servo assembly 8 during long-term operation.

[0031] 4. A double-stage two-jaw puller, comprising: an outer two-jaw puller 5 and an inner two-jaw puller 6; the double-stage two-jaw puller is mounted on a fixed plate 7 and can slide left and right along the fixed plate 7, used to press the symmetry tooling 1 into and pull out of the servo assembly 8; the fixed plate 7 is sleeved around the extension shaft of the hydraulic pump 2.

[0032] In one optional embodiment, the fixing plate 7 has a circular ring structure in the middle and rectangular plate structures on both sides; the fixing plate 7 is an integral structure.

[0033] The extension shaft of the hydraulic pump 2 passes through the annular structure in the middle of the fixed plate 7 and is fixedly connected to the pressure head 3. The outer two-jaw puller 5 and the inner two-jaw puller 6 are mounted on the rectangular plate structure of the fixed plate 7 and can slide left and right along the fixed plate 7.

[0034] In an optional embodiment, the inner two-jaw puller 6 is disposed inside the outer two-jaw puller 5, and the inner two-jaw puller 6 is used to clamp the positioning ear 12 of the symmetry tooling 1; the outer two-jaw puller 5 is used to clamp the boss of the servo assembly 8 on the bottom side of the mounting plate 4.

[0035] When pressing the symmetry fixture 1 into the servo assembly 8, the outer two-jaw puller 5 is slid inward so that it clamps the boss of the servo assembly 8 on the bottom side of the mounting plate 4. The clamping action of the outer two-jaw puller 5 causes the hydraulic pump 2 to work so that the pressure head 3 presses the symmetry fixture 1 into the servo assembly 8.

[0036] When the symmetry fixture 1 is to be pulled out of the servo assembly 8, slide the outer two-jaw puller 5 outward to the outside of the mounting plate 4 and stop using it. Then, clamp the positioning ear 12 of the symmetry fixture 1 with the inner two-jaw puller 6 and pull the symmetry fixture 1 out of the annular groove 81 of the output shaft of the servo assembly 8 safely and smoothly.

[0037] Through the coordinated action of the inner two-jaw puller 6 and the outer two-jaw puller 5, the entire device can ensure that the symmetry tooling 1 is accurately pressed into the servo assembly 8 during operation, and can also ensure that the symmetry tooling 1 is pulled out of the servo assembly 8 stably without damaging the servo assembly 8, and ensures convenient disassembly and assembly.

[0038] In an optional embodiment, a limiting screw 71 is provided on the positioning plate and on the outside of the outer two-jaw puller 5. When the outer two-jaw puller 5 slides outward during operation, its sliding path is blocked by the limiting screw 71, thereby preventing the outer two-jaw puller 5 from moving outward excessively and keeping it within the preset working position.

[0039] In one optional embodiment, two positioning ears 12 are provided, located on both sides of the cylinder 11 respectively; two outer two-claw pullers 5 are provided, respectively installed on the left and right outer sides of the fixing plate 7; and two inner two-claw pullers 6 are provided, respectively installed on the left and right inner sides of the fixing plate 7.

[0040] The cylindrical tube 11 of the symmetry fixture 1 is provided with two positioning ears 12, located on the left and right sides of the cylindrical tube 11 respectively. These two positioning ears 12 have the same structure and size, are symmetrically distributed on the outer wall of the cylindrical tube 11, and are both close to the closed top side of the cylindrical tube 11. Two outer two-jaw pullers 5 are provided, respectively installed on the outer sides of the left and right rectangular plate structures of the fixing plate 7. The outer two-jaw pullers 5 have an L-shaped structure. Two inner two-jaw pullers 6 are provided, respectively installed on the inner sides of the left and right rectangular plate structures of the fixing plate 7. The inner two-jaw pullers 6 also have an L-shaped structure; the length of the outer two-jaw pullers 5 is longer than the length of the inner two-jaw pullers 6.

[0041] Positioning ears 12, outer two-claw pullers 5 and inner two-claw pullers 6 are all set in pairs and arranged symmetrically from left to right to ensure that the force distribution of each component is uniform during assembly or disassembly operations, thereby effectively avoiding deviations or deformations caused by unilateral force.

[0042] In an optional embodiment, through holes 31 are provided on the left and right sides of the pressure head 3. When the symmetry tool 1 is pulled out from the servo assembly 8, the through holes 31 correspond to the positioning ears 12 of the symmetry tool 1. When the symmetry tool 1 is pressed into the servo assembly 8, the through holes 31 are perpendicular to the positioning ears 12 of the symmetry tool 1.

[0043] Figure 4 This is a schematic diagram of the structure of the pressure head 3 provided in an embodiment of the present invention, as shown below. Figure 4 As shown, each side of the pressure head 3 has a through hole 31. These through holes 31 are evenly distributed in the horizontal direction in the structure of the pressure head 3 to ensure left and right symmetry.

[0044] Pull-out state: When the symmetry fixture 1 needs to be pulled out from the servo assembly 8, the through holes 31 on both sides of the pressure head 3 and the positioning ears 12 of the symmetry fixture 1 are on the same plane or in the same extending direction, that is, they correspond to each other. This correspondence allows the inner two-jaw puller 6 to accurately identify and clamp onto the positioning ears 12 through the through holes 31 during the pull-out process, thereby ensuring that the symmetry fixture 1 can be pulled out smoothly and evenly during disassembly.

[0045] Press-in state: When the symmetry fixture 1 needs to be pressed into the servo assembly 8, the through hole 31 of the pressure head 3 and the positioning ear 12 are arranged perpendicularly, that is, the direction of the through hole 31 is orthogonal to the extension direction of the positioning ear 12. This design ensures that the positioning ear 12 will not directly connect with the through hole 31 during the pressing process, avoiding interference between the two and affecting the smooth pressing of the symmetry fixture 1. At the same time, it also allows the hydraulic pressure to be evenly transmitted to the symmetry fixture 1, ensuring the accuracy of the pressing depth.

[0046] In an optional embodiment, the servo assembly puller further includes a placement platform 9; the placement platform 9 is used to place the servo assembly 8. The placement platform 9 is typically designed with positioning holes for fixing the angular displacement sensor of the servo assembly 8 and preventing the servo assembly 8 from shaking during assembly.

[0047] In one optional embodiment, the hydraulic pump 2 is a hand-cranked hydraulic pump 2; the hydraulic pump 2 is equipped with a pressure relief valve for releasing the pressure of the hydraulic pump 2.

[0048] The hydraulic pump 2 is operated manually. When the operator cranks the handle of the hydraulic pump 2, the piston reciprocates within the cylinder, drawing in hydraulic oil, compressing it, and then delivering it to the hydraulic system through the outlet. This process converts mechanical energy into hydraulic energy, providing sufficient thrust to the pressure head 3, thereby enabling accurate pressing into or assisted removal of the symmetry tooling 1. Because the hand-cranked hydraulic pump 2 is simple to operate, compact in structure, and easy to maintain, it is highly suitable for assembling steering gear components 8 where high assembly precision is required.

[0049] The pressure relief valve is typically integrated into the outlet end of the hydraulic pump 2 or inside the pump body, and is designed as a critical safety component of the same class as the hydraulic pump 2. During operation, if it is necessary to stop pressing or start tool removal, the operator can actively or automatically adjust the pressure relief valve to release the pressure in the hydraulic system quickly and smoothly, ensuring that the pressure head 3 can rise smoothly during unloading and avoiding violent impact forces.

[0050] The present invention will be described below through a specific embodiment: 1. Place the product In use, first place the servo assembly 8 on the placement platform 9, then place the angular displacement sensor of the servo assembly 8 into the positioning hole of the placement platform 9 and position it. Place the mounting plate 4 on the servo assembly 8.

[0051] 2. Assemble the fixing plate 7, double-stage two-jaw puller and pressure head 3 The fixing plate 7 is fitted around the extension shaft of the hydraulic pump 2. The double-stage two-jaw puller is installed on the fixing plate 7, and the pressure head 3 is assembled into the corresponding threaded hole of the extension shaft of the hydraulic pump 2. The through hole 31 of the pressure head 3 is kept perpendicular to the extension direction of the fixing plate 7.

[0052] 3. Press in symmetry fixture 1 The operator first manually places the symmetry fixture 1 into the annular groove 81 of the output shaft of the servo assembly 8. At this time, the cylindrical part 11 of the symmetry fixture 1 is roughly located in the annular groove 81, but only the bottom end of the cylindrical part 11 is located in the annular groove 81. After the symmetry fixture 1 is placed, the outer two-jaw puller 5 is slid outward along the fixing plate 7 so that the clamping stop edge of the outer two-jaw puller 5 is ready to contact the pre-reserved boss on the servo assembly 8; then, the outer two-jaw puller 5 is slid inward so that it stably clamps the boss of the servo assembly 8 on the bottom side of the mounting plate 4, thereby providing a stable support and guiding reference for the subsequent tooling pressing. The operator starts to manually crank the hydraulic pump 2, so that the pressure head 3 moves slowly downward. During the downward movement, the pressure head 3 first contacts the symmetry fixture 1 and applies uniform pressure, causing the symmetry fixture 1 to begin to move downward. As the hydraulic components generate constant pressure, the symmetry fixture 1 is gradually pressed into the annular groove 81 in the servo assembly 8. When the symmetry fixture 1 is pressed in about 12mm, the bottom ends of the positioning ears 12 on both sides of the symmetry fixture 1 are exactly aligned with the stop edge of the inner secondary puller, that is, the inner two-jaw puller 6 clamps the positioning ears 12 of the symmetry fixture 1. At this point, the assembly of the symmetry fixture 1 is completed. Eight GB / T70.1 M6×16 screws are then sequentially assembled into the screw holes of the servo assembly 8 and the mounting plate 4, and the M6 ​​screws 10 are tightened using an Allen wrench.

[0053] 4. Take out symmetry fixture 1 The operator first loosens the pressure relief valve on hydraulic pump 2 to gradually release the pressure in the hydraulic system. As the internal pressure decreases, the pressure head 3 begins to rise along the inner shaft of hydraulic pump 2, preparing for the disassembly of the fixture. During the rise of pressure head 3, the operator slides the outer two-jaw puller 5 along the fixed plate 7 to the outside of the mounting plate 4, so that it no longer clamps the fixture. This step creates space for the subsequent rotation of pressure head 3 and prevents the outer mechanism from interfering with the inner clamping action. After pressure head 3 rises above the symmetry fixture 1, the operator then rotates pressure head 3 by 90° so that the direction of the through hole 31 of pressure head 3 is on the same plane or in the same extension direction as the positioning ear 12 of the symmetry fixture 1, i.e., they correspond to each other. At this time, the operator manually cranks hydraulic pump 2 again to slowly move pressure head 3 downward. Pressure head 3 gradually passes through the symmetry fixture 1 until the lower end face of pressure head 3 presses against the mounting plate 4, at which point the inner two-jaw puller 6 clamps the positioning ear 12 of the symmetry fixture 1. Continue to crank the hydraulic pump 2, with the pressure head 3 pressing against the mounting plate 4, forcing the inner two-jaw puller 6 to pull the symmetry tooling 1 evenly out of the annular groove 81 in the servo assembly 8 through a stable clamping action.

[0054] The entire process ensures that the symmetry fixture 1 will not tilt or be damaged due to uneven force during installation and disassembly, while ensuring that the internal structure of the servo assembly 8 is not disturbed, providing good conditions for subsequent assembly or maintenance work.

[0055] The beneficial effects of this invention are: By employing symmetry fixture 1 and precision-machined hydraulic components, as well as key components such as two-stage two-jaw pullers, the relative positional accuracy between the output shaft and mounting plate 4 in the servo assembly 8 is significantly improved, meeting the high-precision assembly requirements of controlling symmetry error within a very small range (e.g., within 0.15mm). The hand-cranked hydraulic pump 2, in conjunction with the pressure relief valve, constitutes a stable and reliable hydraulic drive system, providing smooth and uniform force when pressing in or removing the symmetry fixture 1, reducing assembly errors caused by uneven force. The outer and inner two-jaw pullers 6 precisely clamp the boss of the mounting plate 4 and the positioning ears 12 of the symmetry fixture 1, respectively, achieving multi-point fixation and guidance, thereby greatly improving the stability and repeatability of the entire assembly process.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A servo motor mounting puller device, characterized in that, include: Symmetry fixture, used for mounting in the annular groove of the output shaft of the servo motor assembly; The hydraulic assembly includes: a hydraulic pump and a pressure head connected to the hydraulic pump; the pressure head is used to press a symmetry tooling into the steering gear assembly; A mounting plate is provided for placing on the servo assembly and fixing it to the servo assembly. The mounting plate is provided with mounting holes for the symmetry tooling to pass through so that the symmetry tooling is installed in the annular groove. A dual-stage two-jaw puller includes an outer two-jaw puller and an inner two-jaw puller; the dual-stage two-jaw puller is mounted on a fixed plate and can slide left and right along the fixed plate, used to press the symmetry tooling into and pull out of the servo assembly; the fixed plate is sleeved around the extension shaft of the hydraulic pump.

2. The apparatus according to claim 1, characterized in that: The symmetry fixture includes a cylinder and a positioning ear; the cylinder is an annular structure with a closed top and an open bottom; the positioning ear is fixedly disposed on the outer wall of the cylinder and close to the closed side of the cylinder.

3. The apparatus according to claim 1, characterized in that: The outer diameter tolerance of the symmetry fixture is within the range of (0, -0.1) mm, and the inner diameter tolerance of the symmetry fixture is within the range of (+0.1, 0) mm.

4. The apparatus according to claim 2, characterized in that: The inner two-jaw puller is located inside the outer two-jaw puller. The inner two-jaw puller is used to clamp the positioning ear of the symmetry tooling; the outer two-jaw puller is used to clamp the boss of the servo assembly on the bottom side of the mounting plate.

5. The apparatus according to claim 4, characterized in that: Two positioning ears are provided, located on both sides of the cylinder respectively; two outer two-claw pullers are provided, installed on the left and right outer sides of the fixing plate respectively; two inner two-claw pullers are provided, installed on the left and right inner sides of the fixing plate respectively.

6. The apparatus according to claim 5, characterized in that: A limiting screw is provided on the positioning plate and on the outside of the outer two-jaw puller.

7. The apparatus according to claim 1, characterized in that: The pressure head has through holes on both sides. When the symmetry tooling is pulled out of the servo assembly, the through holes correspond to the positioning ears of the symmetry tooling. When the symmetry tooling is pressed into the servo assembly, the through holes are perpendicular to the positioning ears of the symmetry tooling.

8. The apparatus according to claim 1, characterized in that, Also includes: Placement platform; The placement platform is used to place the servo motor assembly.

9. The apparatus according to claim 1, characterized in that: The mounting plate is fixedly connected to the servo assembly by a plurality of M6 screws.

10. The apparatus according to claim 1, characterized in that: The hydraulic pump is a hand-cranked hydraulic pump; the hydraulic pump is equipped with a pressure relief valve to release the pressure of the hydraulic pump.

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