Two-axis platform shafting structure, tooling and method for adjustable axial gap guide head

Abstract

This invention discloses a two-axis platform shaft system structure, tooling, and method for an adjustable axial clearance guide head, belonging to the field of guide head technology. In this shaft structure, the motor shaft is fixed to the right side of the inner frame; the inner ring of the right bearing is interference-fitted with the motor shaft, and the left end of the right bearing inner ring abuts against the stepped surface on the motor shaft; the outer ring of the right bearing is interference-fitted or transition-fitted with the outer frame; the boss at the left end of the bearing retainer ring fits against the right end of the right bearing outer ring; the resolver shaft is fixed to the left side of the inner frame; the inner ring of the left bearing is interference-fitted with the resolver shaft, and the right end of the left bearing inner ring abuts against the stepped surface on the resolver shaft; the outer ring of the left bearing is interference-fitted with the outer frame, and the left end of the left bearing is flush with the left end face of the left through hole; the bearing retainer plate is threaded to the right side of the outer frame, and the right end face of the bearing retainer plate fits against the end face of the left through hole and the left end of the left bearing outer ring. The required axial clearance can be adjusted at any time by turning the bearing retainer ring.

Description

Technical Field

[0001] This invention belongs to the field of seeker technology, specifically relating to a two-axis platform shaft system structure, tooling, and method for an adjustable axial clearance seeker.

[0002] Background Technology Direction axis

[0003] The structural form of the seeker stabilization platform, as the load-bearing mechanism for seeker servo stabilization, plays a crucial role in many indicators such as seeker isolation, tracking accuracy, and high and low temperature performance. Different shaft system structures and assembly methods greatly affect the axial clearance of the seeker and also influence the ease of subsequent axial clearance adjustment.

[0004] The existing shaft system structure mainly consists of bearing housings and bearing pressure plates. The axial clearance to be reserved needs to be determined before assembly, and the design requirements are met by adding or subtracting shims. This requires strict aging treatment of structural components and accurate calculation of the reserved clearance. If the performance does not meet the design requirements after subsequent assembly, multiple disassembly and reassembly adjustments are required. Summary of the Invention

[0005] In view of this, the present invention provides a guide head two-axis platform shaft system structure with adjustable axial clearance. During installation, only the axial clearance needs to be reserved. During subsequent precise adjustment, there is no need to disassemble and reassemble again. The required axial clearance can be adjusted at any time by turning the bearing pressure ring.

[0006] The present invention adopts the following technical solution:

[0007] An adjustable axial clearance guide head two-axis platform shaft system structure includes a motor-side shaft system, a resolver-side shaft system, an inner frame, and an outer frame;

[0008] The inner frame is located within the outer frame;

[0009] The right side of the outer frame is provided with a right through hole, which includes a coaxial bearing hole and a threaded hole. The bearing hole is located on the side closer to the inner frame, and the threaded hole is located on the side away from the inner frame. The diameter of the bearing hole is smaller than the diameter of the threaded hole. The left side of the outer frame is provided with a left through hole that is coaxial with the right through hole.

[0010] The motor side shaft system includes a motor shaft, a right bearing, and a bearing retaining ring; the motor shaft passes through the right through hole and is fixed to the right side of the inner frame; the inner ring of the right bearing is interference-fitted with the motor shaft, and the left end of the inner ring of the right bearing abuts against the mating surface on the motor shaft; the outer ring of the right bearing is interference-fitted or transition-fitted with the bearing hole; the bearing retaining ring is threadedly fitted with the threaded hole, and the boss at the left end of the bearing retaining ring fits against the right end of the outer ring of the right bearing.

[0011] The resolver side shaft system includes a resolver shaft, a left bearing, and a bearing pressure plate. The resolver shaft passes through the left through hole and is fixed to the left side of the inner frame. The inner ring of the left bearing is interference-fitted with the resolver shaft, and the right end of the inner ring of the left bearing abuts against the stepped surface on the resolver shaft. The outer ring of the left bearing is interference-fitted with the left through hole, and the left end of the left bearing is flush with the left end face of the left through hole. The bearing pressure plate is threaded to the right side of the outer frame, and the right end face of the bearing pressure plate is in contact with the end face of the left through hole and the left end of the outer ring of the left bearing.

[0012] Furthermore, the motor shaft is a stepped shaft, and the length of the section of the stepped shaft that is interference-fitted with the right bearing is less than the width of the right bearing;

[0013] The width of the right bearing is greater than the width of the right bearing bore;

[0014] The boss at the left end of the bearing ring can extend into the bearing hole.

[0015] Furthermore, a right countersunk hole is provided on the right side of the inner frame, and the left end of the motor shaft matches the shape of the right countersunk hole;

[0016] A left countersunk hole is provided on the left side of the inner frame, and the right end of the resolver shaft matches the shape of the left countersunk hole.

[0017] Furthermore, the resolver shaft is a hollow shaft, and the resolver shaft is connected to the left side of the inner frame by screws;

[0018] The motor shaft is a hollow shaft, and the motor shaft is connected to the right side of the inner frame by screws.

[0019] Furthermore, it also includes electric motors and resolvers;

[0020] The motor is connected to the motor shaft and is used to drive the inner frame to rotate around the axis of the motor shaft and the resolver shaft;

[0021] The resolver is connected to the resolver shaft and is used to measure the rotation angle of the inner frame.

[0022] The present invention also provides a stop tool for assembling a two-axis platform shaft system structure, used for assembling the above-mentioned adjustable axial clearance guide head two-axis platform shaft system structure, the stop tool including a motor shaft extension and a stop nut;

[0023] The motor shaft extension is a stepped tubular component, comprising a small section and a large section; the small section is provided with external threads; the outer diameter of the large section is smaller than the inner diameter of the bearing pressure ring.

[0024] The stop nut is provided with an internal thread, and the stop nut is threadedly engaged with the small pipe section;

[0025] The motor shaft extension can be coaxially connected to the right side of the motor shaft by screws, and after the stop nut is threaded into the small pipe section, the left end of the stop nut abuts against the right end of the inner ring of the right bearing.

[0026] Furthermore, the stop nut is provided with a radial through hole for inserting a set screw.

[0027] The present invention also provides an assembly method for an adjustable axial clearance guide head two-axis platform shaft system structure. This method utilizes the aforementioned stop fixture to assemble the aforementioned adjustable axial clearance guide head two-axis platform shaft system structure. The method includes:

[0028] Step 1: Assemble the right bearing, the motor shaft, and the stop fixture, such that the right bearing is interference-fitted onto the motor shaft, and the right end of the stop nut abuts against the right end of the inner ring of the right bearing; assemble the left bearing with the resolver shaft using an interference fit.

[0029] Step 2: Place the inner frame into the outer frame, align the right end of the resolver shaft with the left through hole, and position the left end of the left bearing outside the left end of the left through hole; then thread the bearing pressure plate to the end of the left through hole. During the threaded connection of the bearing pressure plate to the end of the left through hole, the right end face of the bearing pressure plate presses the left bearing and the right end of the resolver shaft together into the left through hole until the right end face of the bearing pressure plate is in contact with the left end face of the left through hole.

[0030] Step 3: Fix the right end of the resolver shaft to the left side of the inner frame;

[0031] Step 4: Fix the left end of the motor shaft to the right side of the inner frame, and make the right bearing interfere with or transition fit the bearing hole, and make the right end of the right bearing protrude from the bearing hole;

[0032] Step 5: Screw the bearing retainer ring into the threaded hole until the boss on the left end of the bearing retainer ring contacts the right end of the outer ring of the right bearing.

[0033] Step 6: Measure the axial clearance and slowly screw in the bearing retainer ring, so that the boss at the left end of the bearing retainer ring applies a force to the left to the right end of the outer ring of the right bearing, until the axial clearance measurement result meets the requirements.

[0034] Furthermore, during the assembly of the right bearing, the motor shaft, and the stop fixture in step one, a set screw is inserted into the radial through hole of the stop nut to fix the right bearing to the motor shaft, and a resolver shaft extension fixture is installed on the resolver shaft.

[0035] The resolver shaft extension fixture has a flat surface for measuring axial clearance using a dial indicator.

[0036] Beneficial effects:

[0037] 1. The inner frame is located inside the outer frame; a right through hole is provided on the right side of the outer frame, including a coaxial bearing hole and a threaded hole. The bearing hole is located near the inner frame, and the threaded hole is located away from the inner frame. The diameter of the bearing hole is smaller than the diameter of the threaded hole; a left through hole, coaxial with the right through hole, is provided on the left side of the outer frame; the motor-side shaft system includes a motor shaft, a right bearing, and a bearing retaining ring; the motor shaft passes through the right through hole and is fixed to the right side of the inner frame; the inner ring of the right bearing is interference-fitted with the motor shaft, and the left end of the inner ring of the right bearing abuts against the mating surface on the motor shaft; the outer ring of the right bearing is interference-fitted with the bearing hole or... Transition fit; the bearing retaining ring is threaded into the threaded hole, and the boss at the left end of the bearing retaining ring is in contact with the right end of the outer ring of the right bearing; the resolver side shaft system includes the resolver shaft, the left bearing, and the bearing retaining plate; the resolver shaft passes through the left through hole and is fixed to the left side of the inner frame; the inner ring of the left bearing is interference-fitted with the resolver shaft, and the right end of the inner ring of the left bearing abuts against the stepped surface on the resolver shaft; the outer ring of the left bearing is interference-fitted with the left through hole, and the left end of the left bearing is flush with the left end face of the left through hole; the bearing retaining plate is threaded to the right side of the outer frame, and the right end face of the bearing retaining plate is in contact with the end face of the left through hole and the left end of the outer ring of the left bearing.

[0038] In this way, only an axial clearance needs to be reserved during installation. During subsequent precise adjustments, there is no need to disassemble and reassemble again. The required axial clearance can be adjusted at any time by turning the bearing pressure ring.

[0039] 2. The length of the section of the stepped shaft that is interference-fitted with the right bearing is less than the width of the right bearing; the width of the right bearing is greater than the width of the right bearing bore; the boss at the left end of the bearing ring can extend into the bearing bore.

[0040] Thus, by turning the bearing retainer ring, the boss on the bearing retainer ring can apply a leftward thrust to the right end of the right bearing outer ring, thereby adjusting the axial clearance of the guide head's two-axis platform shaft system.

[0041] 3. A right countersunk hole is provided on the right side of the inner frame, and the left end of the motor shaft fits into the shape of the right countersunk hole; a left countersunk hole is provided on the left side of the inner frame, and the right end of the resolver shaft fits into the shape of the left countersunk hole. This facilitates the connection between the inner frame and the motor shaft and resolver shaft.

[0042] 4. The motor shaft extension is a stepped tubular part, including a small section and a large section; the small section is provided with external threads; the outer diameter of the large section is smaller than the inner diameter of the bearing pressure ring; the stop nut is provided with internal threads, and the stop nut is threaded with the small section; the motor shaft extension can be coaxially connected to the right side of the motor shaft by screws, and after the stop nut is threaded with the small section, the left end of the stop nut abuts against the right end of the right bearing inner ring.

[0043] In this way, the right bearing can be fixed to the motor shaft by the stop fixture during assembly, effectively avoiding the problem of relative slippage between the right bearing and the motor shaft caused by tolerance issues and non-standard assembly process.

[0044] 5. The locking nut is provided with a radial through hole for inserting the set screw. This prevents the locking nut from moving due to external forces such as vibration, making the right bearing more reliably fixed.

[0045] 6. The resolver shaft extension fixture has a flat surface, which is convenient for measuring axial clearance with a dial indicator. Furthermore, since the motor shaft extension is a stepped tubular component, it also has an end face, which is convenient for measuring axial clearance with a dial indicator. When simultaneously measuring axial clearance with a dial indicator on the flat surfaces of the resolver shaft extension fixture and the motor shaft extension, the axial clearance of the adjustable axial clearance guide head's two-axis platform shaft system can be measured simply by moving the entire assembly consisting of the motor shaft, resolver shaft, and inner frame to its limit in the left or right direction along the motor shaft axis. Attached Figure Description

[0046] Figure 1 A cross-sectional view of a guide head two-axis platform shaft system structure with adjustable axial clearance provided by the present invention;

[0047] Figure 2 for Figure 1 The side shaft system of the central motor;

[0048] Figure 3 for Figure 1 Medium-rotation variable-side shaft system;

[0049] Figure 4 for Figure 1 A three-dimensional structural diagram of the motor shaft in the diagram;

[0050] Figure 5 for Figure 1 A three-dimensional structural diagram of the bearing pressure plate in the diagram;

[0051] Figure 6 for Figure 1 A three-dimensional structural diagram of the bearing retaining ring in the image;

[0052] Figure 7 for Figure 1 A three-dimensional structural diagram of the mid-rotation variable shaft extension tooling;

[0053] Figure 8 for Figure 1 A three-dimensional structural diagram of the motor shaft extension and locking nut of the central bearing;

[0054] Among them, 1-motor side shaft system, 11-motor shaft, 12-right bearing, 13-bearing pressure ring, 2-resolver side shaft system, 21-resolver shaft, 22-left bearing, 23-bearing pressure plate, 3-inner frame, 4-outer frame, 5-stop tooling, 51-motor shaft extension, 52-stop nut, 6-resolver shaft extension tooling. Detailed Implementation

[0055] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0056] Example 1:

[0057] like Figures 1 to 8 As shown, a guide head two-axis platform shaft system structure with adjustable axial clearance includes a motor-side shaft system 1, a resolver-side shaft system 2, an inner frame 3, and an outer frame 4, wherein:

[0058] The inner frame 3 (with the guide head mounted on it) is located inside the outer frame 4. A right through hole is provided on the right side of the outer frame 4, comprising a coaxial bearing hole and a threaded hole. The bearing hole is located near the inner frame 3, and the threaded hole is located away from the inner frame 3. The diameter of the bearing hole is smaller than the diameter of the threaded hole. A left through hole, coaxial with the right through hole, is provided on the left side of the outer frame 4. The motor-side shaft system 1 includes a motor shaft 11, a right bearing 12, and a bearing retaining ring 13. The motor shaft 11 passes through the right through hole and is fixed to the right side of the inner frame 3. The inner ring of the right bearing 12 is interference-fitted with the motor shaft 11, and the left end of the inner ring of the right bearing 12 abuts against the mating surface on the motor shaft 11. The outer ring of the right bearing 12 is interference-fitted with the bearing hole or... The bearing retainer 13 is threaded into the threaded hole, and the boss at the left end of the bearing retainer 13 fits against the right end of the outer ring of the right bearing 12. The resolver side shaft system 2 includes a resolver shaft 21, a left bearing 22, and a bearing retainer plate 23. The resolver shaft 21 passes through the left through hole and is fixed to the left side of the inner frame 3. The inner ring of the left bearing 22 is interference-fitted with the resolver shaft 21, and the right end of the inner ring of the left bearing 22 abuts against the stepped surface on the resolver shaft 21. The outer ring of the left bearing 22 is interference-fitted with the left through hole, and the left end of the left bearing 22 is flush with the left end face of the left through hole. The bearing retainer plate 23 is threadedly connected to the right side of the outer frame 4, and the right end face of the bearing retainer plate 23 fits against the end face of the left through hole and the left end of the outer ring of the left bearing 22.

[0059] In this way, only an axial clearance needs to be reserved during installation. During subsequent precise adjustments, there is no need to disassemble and reassemble. The required axial clearance can be adjusted at any time by turning the bearing retainer 13 (the axial clearance needs to be measured while turning the bearing retainer 13).

[0060] It should be noted that, in this embodiment, axial clearance refers to the amount of displacement that the entire assembly consisting of the motor shaft 11, resolver shaft 21, and inner frame 3 can generate along the axial direction of the motor shaft 11 when the outer frame 4 is fixed. This displacement is visually represented as follows: when the outer frame 4 is fixed, the entire assembly consisting of the motor shaft 11, resolver shaft 21, and inner frame 3 can move to a left limit position along the axial direction of the motor shaft 11, and can also move to a right limit position along the axial direction of the motor shaft 11. The displacement of the entire assembly consisting of the motor shaft 11, resolver shaft 21, and inner frame 3 from the left limit position to the right limit position is the axial clearance. Obviously, this axial clearance is related to the axial clearance of the left bearing 22 and the right bearing 12. The larger the axial clearance of the left bearing 22 and the right bearing 12, the larger the axial clearance; conversely, the smaller the axial clearance of the left bearing 22 and the right bearing 12, the smaller the axial clearance. Moreover, in this embodiment, the reserved axial clearance can only be reduced by turning the bearing pressure ring 13 until the axial clearance meets the requirements.

[0061] Specifically, the motor shaft 11 is a stepped shaft, and the length of the section of the stepped shaft that is interference-fitted with the right bearing 12 is less than the width of the right bearing 12; the width of the right bearing 12 is greater than the width of the right bearing bore; the boss at the left end of the bearing ring 13 (see...) Figure 1 and Figure 6 An annular boss is provided on one end face of the bearing ring 13. In actual operation, the boss can be evenly distributed circumferentially on one end face of the bearing ring 13 and can extend into the bearing hole. More specifically, the motor shaft 11 is a hollow stepped shaft with a through hole in the middle. The motor shaft 11 is divided into three sections by the steps, which are respectively connected to the stop fixture 5, the right bearing 12, and the inner frame 3. The motor-side stop fixture 5 is fixedly connected to the motor shaft 11 with screws, and the inner frame 3 is fixedly connected to the motor shaft 11 with screws. Moreover, the resolver shaft 21 is also a hollow stepped shaft with a through hole in the middle. The resolver shaft 21 is divided into three sections by the steps, which are respectively connected to the resolver shaft extension fixture 6 (the resolver shaft extension fixture 6 has a flat surface for measuring the axial clearance with a dial indicator and can be removed after measuring the axial clearance), the left bearing 22, and the inner frame 3. The resolver shaft extension fixture 6 is fixedly connected to the resolver shaft 21 with screws, and the inner frame 3 is fixedly connected to the resolver shaft 21 with screws.

[0062] Thus, by turning the bearing retaining ring 13, the boss on the bearing retaining ring 13 can apply a leftward thrust to the right end of the outer ring of the right bearing 12, thereby adjusting the axial clearance of the guide head's two-axis platform shaft system.

[0063] More specifically, a right countersunk hole is provided on the right side of the inner frame 3, and the left end of the motor shaft 11 is fitted with the shape of the right countersunk hole; a left countersunk hole is provided on the left side of the inner frame 3, and the right end of the resolver shaft 21 is fitted with the shape of the left countersunk hole. In this way, it is convenient to connect the inner frame 3 with the motor shaft 11 and the resolver shaft 21.

[0064] In addition, a motor and a resolver can be designed; the motor is connected to the motor shaft 11 and is used to drive the inner frame 3 to rotate around the axis of the motor shaft 11 and the resolver shaft 21; the resolver is connected to the resolver shaft 21 and is used to measure the rotation angle of the inner frame 3.

[0065] Example 2:

[0066] Based on Embodiment 1, this embodiment provides a stop tool 5 for assembling a two-axis platform shaft system structure. This stop tool is used for assembling a guide head two-axis platform shaft system structure with adjustable axial clearance as described in Embodiment 1.

[0067] See appendix Figures 1 to 8 The stop fixture 5 includes a motor shaft extension 51 and a stop nut 52. The motor shaft extension 51 is a stepped tubular part, including a small section and a large section. The small section is provided with external threads. The outer diameter of the large section is smaller than the inner diameter of the bearing pressure ring 13. The stop nut 52 is provided with internal threads and is threaded with the small section. The motor shaft extension 51 can be coaxially connected to the right side of the motor shaft by screws. After the stop nut 52 is threaded with the small section, the left end of the stop nut 52 abuts against the right end of the inner ring of the right bearing 12.

[0068] Thus, during assembly, the right bearing can be fixed to the motor shaft 11 by the stop fixture 5, effectively preventing relative slippage between the right bearing 12 and the motor shaft 11 caused by tolerance issues or non-standard assembly processes. Furthermore, the stop nut 52 is provided with a radial through hole for inserting a set screw, thereby preventing the stop nut 52 from moving due to external forces such as vibration, making the fixing of the right bearing 12 more reliable. It should be noted that... Figure 1 The stop fixture 5 will be removed after the guide head two-axis platform shaft system structure with adjustable axial clearance is assembled, and the right end of the motor shaft 11 will be connected to the motor.

[0069] Example 3:

[0070] Based on Embodiments 1 and 2, this embodiment provides an assembly method for an adjustable axial clearance guide head two-axis platform shaft system structure. This method utilizes the stop fixture 5 from Embodiment 2 to assemble the adjustable axial clearance guide head two-axis platform shaft system structure from Embodiment 1. The assembly method includes:

[0071] Step 1: Assemble the right bearing 12, motor shaft 11, and stop fixture 5, so that the right bearing 12 is interference-fitted onto the motor shaft 11, and the right end of the stop nut 52 abuts against the right end of the inner ring of the right bearing 12; assemble the left bearing 22 with the resolver shaft 21 in an interference fit.

[0072] Step 2: Place the inner frame 3 into the outer frame 4, align the right end of the resolver 21 with the left through hole, and position the left end of the left bearing 22 outside the left end of the left through hole; then thread the bearing pressure plate 23 to the end of the left through hole. During the threaded connection between the bearing pressure plate 23 and the end of the left through hole, the right end face of the bearing pressure plate 23 presses the left bearing 22 and the right end of the resolver 21 together into the left through hole until the right end face of the bearing pressure plate 23 is in contact with the left end face of the left through hole.

[0073] Step 3: Fix the right end of the resolver shaft 21 to the left side of the inner frame 3;

[0074] Step 4: Fix the left end of the motor shaft 11 to the right side of the inner frame 3, and make the right bearing 12 interference fit or transition fit with the bearing hole, and make the right end of the right bearing 12 protrude from the bearing hole;

[0075] Step 5: Screw the bearing retainer ring 13 into the threaded hole until the boss at the left end of the bearing retainer ring 13 contacts the right end of the outer ring of the right bearing 12.

[0076] Step 6: Measure the axial clearance and slowly screw in the bearing retainer ring 13, so that the boss at the left end of the bearing retainer ring 13 applies a force to the right end of the outer ring of the right bearing 12 to the left, until the axial clearance measurement result meets the requirements.

[0077] Specifically, during the assembly of the right bearing 12, motor shaft 11, and stop fixture 5 in step one above, a set screw can be inserted into the radial through hole of the stop nut 52 to fix the right bearing 12 to the motor shaft 11, and a resolver shaft extension fixture 6 can be installed on the resolver shaft 21; the resolver shaft extension fixture 6 has a flat surface (see...). Figure 7 The end of the resolver extension fixture 6 is flat and can be used to measure the axial clearance with a dial indicator. Furthermore, after step six above, the stop fixture 5 is removed to connect the right end of the motor shaft 11 to the motor, and the resolver shaft extension fixture 5 is removed to connect the left end of the resolver shaft 21 to the resolver.

[0078] See Figure 7Because the resolver shaft extension fixture 6 has a flat surface, it is convenient to use dial indicators to measure the axial clearance. Furthermore, since the motor shaft extension 51 is a stepped tubular shape and also has an end face (a flat end), it is also convenient to use dial indicators to measure the axial clearance. When simultaneously measuring the axial clearance using dial indicators on the flat surfaces of the resolver shaft extension fixture 6 and the motor shaft extension 51, it is only necessary to move the entire assembly consisting of the motor shaft 11, resolver shaft 21, and inner frame 3 to its limit in the left or right axial direction of the motor shaft 11. The axial clearance of the adjustable axial clearance guide head's two-axis platform shaft system can then be measured by reading the data from the two dial indicators.

[0079] It should be noted that the resolver shaft extension fixture 6 is used to measure the axial clearance by using a dial indicator on its plane. In actual assembly, the resolver shaft extension fixture 6 may not be used, and the dial indicator may be used only on the end of the motor shaft extension 51 of the stop fixture 5. Alternatively, a convenient position for dial indicator can be found in the existing structure or other structures that facilitate dial indicator measurement can be designed.

[0080] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stop fixture for assembling a two-axis platform shaft system, characterized in that, The guide head two-axis platform shaft system structure is used for assembly of adjustable axial clearance. The guide head two-axis platform shaft system structure includes a motor-side shaft system, a resolver-side shaft system, an inner frame, and an outer frame. The inner frame is located inside the outer frame. A right through hole is provided on the right side of the outer frame. The right through hole includes a coaxial bearing hole and a threaded hole. The bearing hole is located on the side closer to the inner frame, and the threaded hole is located on the side away from the inner frame. The diameter of the bearing hole is smaller than the diameter of the threaded hole. A left through hole coaxial with the right through hole is provided on the left side of the outer frame. The motor side shaft system includes a motor shaft, a right bearing, and a bearing retaining ring; the motor shaft passes through the right through hole and is fixed to the right side of the inner frame; the inner ring of the right bearing is interference-fitted with the motor shaft, and the left end of the inner ring of the right bearing abuts against the stepped surface on the motor shaft; the outer ring of the right bearing is interference-fitted or transition-fitted with the bearing hole; the bearing retaining ring is threadedly fitted with the threaded hole, and the boss at the left end of the bearing retaining ring fits against the right end of the outer ring of the right bearing. The resolver side shaft system includes a resolver shaft, a left bearing, and a bearing pressure plate. The resolver shaft passes through the left through hole and is fixed to the left side of the inner frame. The inner ring of the left bearing is interference-fitted with the resolver shaft, and the right end of the inner ring of the left bearing abuts against the stepped surface on the resolver shaft. The outer ring of the left bearing is interference-fitted with the left through hole, and the left end of the left bearing is flush with the left end face of the left through hole. The bearing pressure plate is threaded to the left side of the outer frame, and the right end face of the bearing pressure plate is in contact with the end face of the left through hole and the left end of the outer ring of the left bearing. The stop tooling includes a motor shaft extension and a stop nut; The motor shaft extension is a stepped tubular component, comprising a small section and a large section; the small section is provided with external threads; the outer diameter of the large section is smaller than the inner diameter of the bearing pressure ring. The stop nut is provided with an internal thread, and the stop nut is threadedly engaged with the small pipe section; The motor shaft extension can be coaxially connected to the right side of the motor shaft by screws, and after the stop nut is threaded into the small pipe section, the left end of the stop nut abuts against the right end of the inner ring of the right bearing.

2. The stop fixture for assembling a two-axis platform shaft system according to claim 1, characterized in that, The stop nut is provided with a radial through hole for inserting a set screw.

3. An assembly method for a guide head two-axis platform shaft system structure with adjustable axial clearance, characterized in that, The method of assembling the guide head two-axis platform shaft system structure using the stop fixture as described in claim 1 or 2 includes: Step 1: Assemble the right bearing, the motor shaft, and the stop fixture, such that the right bearing is interference-fitted onto the motor shaft, and the right end of the stop nut abuts against the right end of the inner ring of the right bearing; assemble the left bearing with the resolver shaft using an interference fit. Step 2: Place the inner frame into the outer frame, align the right end of the resolver shaft with the left through hole, and position the left end of the left bearing outside the left end of the left through hole; then thread the bearing pressure plate to the end of the left through hole. During the threaded connection of the bearing pressure plate to the end of the left through hole, the right end face of the bearing pressure plate presses the left bearing and the right end of the resolver shaft together into the left through hole until the right end face of the bearing pressure plate is in contact with the left end face of the left through hole. Step 3: Fix the right end of the resolver shaft to the left side of the inner frame; Step 4: Fix the left end of the motor shaft to the right side of the inner frame, and make the right bearing interfere with or transition fit the bearing hole, and make the right end of the right bearing protrude from the bearing hole; Step 5: Screw the bearing retainer ring into the threaded hole until the boss on the left end of the bearing retainer ring contacts the right end of the outer ring of the right bearing. Step 6: Measure the axial clearance and slowly screw in the bearing retainer ring, so that the boss at the left end of the bearing retainer ring applies a force to the left to the right end of the outer ring of the right bearing, until the axial clearance measurement result meets the requirements.

4. The assembly method of the adjustable axial clearance guide head two-axis platform shaft system structure according to claim 3, characterized in that, During the assembly of the right bearing, the motor shaft, and the stop fixture in step one, a set screw is inserted into the radial through hole of the stop nut to fix the right bearing to the motor shaft, and a resolver shaft extension fixture is installed on the resolver shaft. The resolver shaft extension fixture has a flat surface for measuring axial clearance using a dial indicator.

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