Disassembling tool for embedded straight gear and using method of disassembling tool

Abstract

The invention discloses a dismounting tool for an embedded straight gear. The dismounting tool solves the problem of dismounting of a straight gear which is not provided with a reserved dismounting structure and is embedded in a narrow calabash-shaped sinking groove. The cross arm is provided with a T-shaped groove and a screw hole, the threaded ejector rod is used for centering and applying force through the screw hole, a sheet body of the drag hook assembly can be inserted into a gap between a gear and a sinking groove to hook a tooth part, and the sheet body is symmetrically distributed to ensure balanced stress. And a jackscrew fine adjustment structure is additionally arranged to adapt to offset between odd teeth, and a wedge-shaped clamping structure is used for realizing quick disassembly and assembly. The tool is suitable for embedded straight gears with even / odd teeth, is particularly suitable for narrow gaps within 2mm, can be stably disassembled to avoid damage, and fills the blank of maintenance tools for the gears.

Description

Technical Field

[0001] This invention relates to the field of mechanical assembly and maintenance technology, and in particular to a special tool for disassembling a spur gear embedded in a housing groove and its method of use. Technical Background

[0002] In mechanical gear transmission mechanisms, there exists a special type of structure: such as Fig. 1-2 As shown, the spur gear 1 is embedded in the gourd-shaped recess 21 of the housing 2, and the spur gear 1 and the gear shaft 3 are tightly fitted by a spline. Because the design of this type of spur gear 1 does not take into account the needs of later maintenance, it does not have structural features such as disassembly holes or flanges that facilitate disassembly, making it almost impossible to disassemble by hand during later replacement or maintenance. Due to the compact design of the mechanism, the space between the spur gear 1 and the recess 21 is extremely small: the gap between the bottom surface of the spur gear 1 and the bottom surface of the recess 21 is only about 2 mm, and the gap between the tooth tip of the spur gear 1 and the narrow-diameter sidewall of the recess 21 is also only about 2 mm, while there is a large operating space between the tooth tip of the spur gear 1 and the wide-diameter section of the recess 21. This narrow space makes it impossible to use existing conventional disassembly tools such as hook pullers and wedges—the claws of hook pullers cannot extend into and reliably clamp the spur gear 1, and the wedges are difficult to apply effective separation force due to insufficient operating space. Ultimately, the disassembly of the spur gear 1 becomes a prominent problem in mechanical maintenance. Summary of the Invention To address the unique installation environment and disassembly challenges of the embedded spur gear 1, housing 2, countersunk groove 21, and gear shaft 3, this invention provides a specialized disassembly tool that can adapt to confined spaces and apply a stable separation force to the spur gear 1. The technical solution adopted is as follows: A tool for disassembling an embedded spur gear, comprising: The crossbeam has a length less than or equal to the outer diameter of the spur gear, and T-slots extending along the length direction and open at the bottom are respectively opened at both ends, and a first screw hole extending along the vertical direction is opened in the middle. The threaded push rod has an external thread that is screwed into the first threaded hole, a non-circular force-applying part at the top end, and a conical centering part at the bottom end that is adapted to the center hole of the gear shaft. Two sliders are inserted into the T-slot from the end of the T-slot, and their length and width are less than or equal to the length and width of the T-slot, respectively. Two hook assemblies include a rod that can be inserted between the teeth of a spur gear and a plate located between the spur gear and the housing. The plate has a thickness of less than or equal to 1.5 mm and its two sides can hook the tooth sides and / or tooth roots of two adjacent teeth of the spur gear. The upper end of the rod is fixedly connected to the slider and the lower end is fixedly connected to or integrally connected to the plate. The two hook assemblies are symmetrically distributed with respect to the center of the first screw hole.

[0003] Further, two second screw holes are respectively arranged on the cross arms on both sides of the T-shaped groove, extending along the width direction of the cross arm, and a top pin is screwed in the second screw hole; when the width of the sliding block is less than the width of the T-shaped groove, the sliding block can be limited and adjusted in the width direction of the T-shaped groove by adjusting the top pin.

[0004] Further, a recess is arranged in the middle of the lower surface of the cross arm, the depth of the recess is greater than the height of the gear shaft exceeding the upper surface of the spur gear, and the width of the recess is greater than the outer diameter of the gear shaft, so as to avoid the part of the gear shaft exceeding the upper surface of the spur gear.

[0005] Further, the top wall of the T-shaped groove extends upward to form an avoiding groove; a conical hole extending in the up-down direction is arranged on the sliding block near the outer end position, the conical hole is in a taper structure with the upper part being large and the lower part being small, and the minimum inner diameter of the conical hole is greater than or equal to the outer diameter of the rod body; two symmetrically arranged wedge-shaped clamping tiles are further included, the outer peripheral surface of the wedge-shaped clamping tile is a taper surface matched with the conical hole, and the inner peripheral surface is a circular surface matched with the outer peripheral surface of the rod body; when the wedge-shaped clamping tile is placed in the conical hole, the outer peripheral surface of the wedge-shaped clamping tile and the taper surface of the conical hole form a wedge structure, the inner peripheral surface of the wedge-shaped clamping tile and the outer peripheral surface of the rod body are tightly matched, and the upper ends of the wedge-shaped clamping tile and the rod body are accommodated in the avoiding groove.

[0006] Further, the force applying part of the threaded rod is a regular hexagonal structure, matched with a standard forked wrench; or the force applying part of the threaded rod is an internal hexagonal recess structure, arranged on a cylindrical nail head at the top end of the threaded rod, the diameter of the nail head is greater than the diameter of the rod part of the threaded rod, and matched with a standard internal hexagonal wrench.

[0007] Further, the rod body is a circular rod with a diameter of 2-5 mm, and the sheet body is a circular sheet with an outer diameter of 5-10 mm, both of which are integrally forged from 65Mn spring steel and then machined, and a transition round corner with a radius of 1-2 mm is arranged at the connecting position of the rod body and the sheet body.

[0008] Further, the rod body is a circular rod with a diameter of 2-5 mm and made of 65Mn spring steel, and a circumferential annular groove is arranged at the lower end of the rod body; the sheet body is a carbon fiber sheet with an outer diameter of 5-10 mm and a thickness of 0.8-1.2 mm, an installation hole matched with the lower end of the rod body is arranged at the center of the sheet body, and a protrusion matched with the annular groove is arranged on the inner wall of the installation hole; the rod body and the sheet body are bonded by high-strength epoxy resin adhesive, and the annular groove and the protrusion form a mechanical locking structure.

[0009] The application further discloses a use method of the dismounting tool for the built-in spur gear. 1) Pretreatment, cleaning the gap between the spur gear and the shell sink and the impurities at the top end of the gear shaft, and ensuring that the operation space is free of foreign matters; 2) Assemble the pull hook assembly, fix the upper end of the rod body of the two pull hook assemblies with the slider, so that the distance between the lower surface of the slider and the upper surface of the sheet body is greater than or equal to the thickness of the spur gear; 3) Install the cross arm, place the cross arm on the upper surface of the spur gear, and make the A end correspond to the wide diameter section of the sink groove and the B end correspond to the narrow diameter section of the sink groove; 4) Centering, screw the threaded jacks into the first screw hole of the cross arm, so that the lower end conical surface centering part fits the center hole of the gear shaft, and the lower surface of the cross arm does not deviate from the upper surface of the spur gear; 5) Install the first pull hook assembly, place one pull hook assembly into the T-shaped groove end of the A end from the wide diameter section of the sink groove, and insert the sheet body between the spur gear and the bottom surface of the sink groove from the wide diameter section of the sink groove, and make the rod body enter the tooth gap of the two closest teeth of the spur gear; 6) Turn the direction, rotate the gear shaft by 180°, so that the A end of the cross arm corresponds to the narrow diameter section of the sink groove and the B end corresponds to the wide diameter section of the sink groove; 7) Install the second pull hook assembly, place the other pull hook assembly into the T-shaped groove end of the B end from the wide diameter section of the sink groove, and insert the sheet body between the spur gear and the bottom surface of the sink groove from the wide diameter section of the sink groove, and make the rod body enter the tooth gap of the two closest teeth of the spur gear; 8) Force disassembly, fix the cross arm, use the force applying part of the threaded jack to clamp the threaded jack, slowly rotate the threaded jack clockwise, drive the cross arm to move upward through the threaded transmission, and pull the pull hook assembly through the slider, so that the spur gear smoothly separates along the gear shaft, and the disassembly is completed.

[0010] Further, in step 2), when the upper end of the rod body is fixed with the slider, the upper end of the rod body is first inserted from the lower end of the conical hole, and after adjusting the distance between the lower surface of the slider and the upper surface of the sheet body, the two wedge-shaped clamping tiles are inserted from the upper end of the conical hole, and then the upper end of the two wedge-shaped clamping tiles is clamped by hammering with a copper hammer and a copper rivet; when disassembling, the lower end of the two wedge-shaped clamping tiles is loosened by hammering with a copper hammer and a copper rivet.

[0011] Further, in steps 5) and 7), the slider is limited and adjusted in the width direction in the T-shaped groove by adjusting the top wires on both sides, so that the rod body accurately enters the tooth gap of the two closest teeth of the spur gear.

[0012] The beneficial technical effects of the present application mainly include the following points: 1. Adapt to the disassembly requirement of narrow space: the thickness of the sheet body of the pull hook assembly is ≤1.5mm, which can be smoothly inserted into the narrow gap between the spur gear and the shell sink, solving the problem that the existing conventional tools cannot enter the operation space due to the large size.

[0013] 2. Reliable hooking and balanced force application: The two sides of the sheet can hook the tooth flanks and / or tooth roots of the adjacent two teeth of the spur gear, and in combination with the design of the two hook assemblies being symmetrically distributed relative to the center of the threaded ejector rod, a symmetric and balanced upward pulling force can be formed on the spur gear, avoiding the jamming or damage of the spur gear caused by the force skewing during disassembly.

[0014] 3. Precise centering and stable force transmission: The conical surface centering part at the lower end of the threaded ejector rod is matched with the center hole of the gear shaft, ensuring that the ejector rod and the gear shaft are coaxial when the force is applied, avoiding eccentric loading and protecting the matching structure of the gear shaft and the spur gear from damage.

[0015] 4. Flexible structure and strong adaptability: The cross arm length is adapted to the outer diameter of the spur gear, the sliding block can adjust the position in the T-shaped groove, and the rod body of the hook assembly can be placed between the teeth, so that the tool can adapt to different specifications of the embedded spur gear, without the need to customize a special tool for a specific gear, reducing the use cost.

[0016] 5. Solving the problem of no reserved disassembly structure: For the problem that the spur gear is not provided with disassembly holes, flanges and other reserved structures, through the combined structure of "sheet hooking tooth part + threaded ejector rod applying force", the disassembly can be realized without relying on the reserved structure of the gear itself, filling the gap of the maintenance tool for this special structure gear. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is a structural schematic diagram of the embedded spur gear, gear shaft and housing of the present application.

[0018] Fig. 2 is a component separation diagram of Fig. 1 .

[0019] Fig. 3 is a structural schematic diagram of the cross arm and hook assembly of the present application.

[0020] Fig. 4 is a component separation diagram of Fig. 3 .

[0021] Fig. 5 is a partial enlarged view of C in Fig. 4 .

[0022] Fig. 6 is a partial enlarged view of D in Fig. 4 .

[0023] Fig. 7 is a structural schematic diagram of the present application installed on the embedded spur gear, gear shaft and housing.

[0024] Fig. 8 is a partial enlarged view of E in Fig. 7 .

[0025] Fig. 9This is a schematic diagram of the structure of the present invention installed on the embedded spur gear, gear shaft and housing from another perspective.

[0026] Fig. 10 yes Fig. 9 A magnified view of a section at point F.

[0027] Fig. 11 This is a schematic diagram of the disassembly process of the even-numbered toothed embedded spur gear in Example 1.

[0028] Fig. 12 This is a schematic diagram of the disassembly process of the odd-tooth in-line spur gear in Example 2. Detailed Implementation

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] Example 1, as Fig. 1-11 As shown, a disassembly tool for an even-numbered toothed embedded spur gear includes: - Crossbeam 4, the length of which is 5-10mm smaller than the outer diameter of spur gear 1, has T-slots 41 extending along the length direction and open at the bottom at both ends, and a first screw hole 42 extending along the vertical direction in the middle. - Threaded push rod 5, the rod is provided with an external thread with a thread specification of M8×1-M12×1.25 that is screwed into the first threaded hole 42, the top end is provided with a cylindrical nail head with a diameter 2-4mm larger than the diameter of the threaded push rod rod, the nail head is provided with an axial hexagon countersunk hole as the force application part with a distance of 6-10mm between the opposite sides of the hexagon, the depth of the countersunk hole is greater than or equal to the insertion depth of the hexagon wrench, and it is compatible with the standard hexagon wrench specified in GB / T5356; the lower end is provided with a conical centering part with a cone angle of 60°±5° that is compatible with the center hole 31 of the gear shaft 3; - Two sliders 6, made of wear-resistant cast iron HT300, can be inserted into the groove from the end of the T-slot 41, and their length and width are 0.5-1mm smaller than the length and width of the T-slot 41, respectively; - Two hook assemblies 7, including a rod 71 with a diameter of 5-8mm made of 65Mn spring steel that can be inserted between the teeth of an even-numbered spur gear 1, and a plate 72 with a thickness of 1.2mm made of 65Mn spring steel located between the spur gear 1 and the recess 21 of the housing 2. The outer diameter of the plate 72 is smaller than the root circle diameter of the spur gear 1. The two sides of the plate 72 are provided with hooks 721 that are adapted to the roots of two adjacent teeth of the spur gear 1. The hooks can fit the tooth roots and hook the bottom edge of the spur gear 1. The upper end of the rod 71 is welded to the slider 6 with a ring fillet weld with a weld leg height of 3-5mm. The lower end is integrally forged with the plate 72 and then machined. The connection part is provided with a transition fillet of R1-R2. The two hook assemblies 7 are symmetrically distributed at 180° with respect to the center of the first screw hole 42.

[0031] When the number of teeth of the built-in spur gear is even, the line between any pair of opposite teeth passes through the shaft center, so the balanced force can be achieved by symmetrical positioning. The use method is as follows: 1) Pretreatment: clean the gap between the spur gear 1 and the sink groove 21 of the shell 2 and the impurities at the top end of the gear shaft 3, and ensure that the operation space is free of foreign matter; 2) Assemble the pull hook assembly: weld the upper end of the rod body 71 of the two pull hook assemblies 7 to the sliding block 6, so that the distance between the lower surface of the sliding block 6 and the upper surface of the sheet body 72 is equal to the thickness of the spur gear 1 + 0.5-1mm reserved disassembly gap; 3) Install the cross arm: place the cross arm 4 horizontally on the upper surface of the spur gear 1, so that the A end corresponds to the wide diameter section of the sink groove 21, and the B end corresponds to the narrow diameter section of the sink groove 21, ensuring that the lower surface of the cross arm 4 is in close contact with the upper surface of the spur gear 1; 4) Centering adjustment: screw the threaded jacks 5 into the first screw hole 42 of the cross arm 4, and slowly screw in until the lower end of the conical surface centering part is in close contact with the center hole 31 of the gear shaft 3. At this time, the cross arm 4 remains horizontal and the lower surface does not deviate from the upper surface of the spur gear 1; 5) Install the first pull hook assembly: insert one pull hook assembly 7 from the wide diameter section of the sink groove 21, so that the sheet body 72 is inserted along the gap between the spur gear 1 and the bottom surface of the sink groove 21, and the rod body 71 is aligned with the set of teeth closest to the A end of the spur gear 1 and placed into, while the sliding block 6 is slid into the A end opening of the T-shaped groove 41 and fixed with the upper end of the rod body 71; 6) Turn the work station: rotate the gear shaft 3 to 180° position, so that the A end of the cross arm 4 corresponds to the narrow diameter section of the sink groove 21, and the B end corresponds to the wide diameter section of the sink groove 21, ensuring that the other set of opposite teeth of the spur gear 1 is aligned with the B end; 7) Install the second pull hook assembly: repeat the operation of step 5, insert the other pull hook assembly 7 from the wide diameter section of the sink groove 21, so that the sheet body 72 is inserted into the gap and the rod body 71 is placed into the corresponding tooth gap, and the sliding block 6 is slid into the B end opening of the T-shaped groove 41 and fixed; 8) Force disassembly: use a wrench to fix the cross arm 4, and use an internal hex wrench to clamp the force part of the threaded jacks 5, slowly rotate the threaded jacks 5 clockwise, drive the cross arm 4 to move upward through threaded transmission, and the cross arm 4 synchronously pulls the two pull hook assemblies 7 through the sliding block 6, so that the spur gear 1 is smoothly separated from the sink groove 21 along the gear shaft 3, and the disassembly is completed.

[0032] To verify whether the strength of the pull hook assembly is sufficient to disassemble the spur gear, the material mechanical properties, structural stress analysis and actual working conditions can be verified from three dimensions: I. Material strength basis The pull hook assembly uses 65Mn spring steel sheet with thickness ≤1.5mm and rod body diameter 5-8mm, and its key mechanical properties are: - Tensile strength ≥1080MPa after quenching and tempering - Yield strength ≥ 880 MPa - Elongation after fracture ≥ 8% This material is widely used in elastic components such as springs, claws that bear impact load, and its strength is much higher than that of ordinary carbon steel such as Q235, with a tensile strength of only 375-500 MPa, providing a basic strength guarantee for the hook assembly.

[0033] II. Structural stress analysis 1. Simplification of stress model When disassembled, the friction force of the spline fit between the straight gear and the gear shaft is the main resistance, denoted as F. The two hook assemblies are symmetrically distributed, each bearing an axial tension of F / 2.

[0034] 2. Strength check of key parts - Rod diameter 5 mm: Cross-sectional area S = π × (5 / 2)² ≈ 19.63 mm² Allowable tension Fallow = yield strength × S = 880 MPa × 19.63 mm² ≈ 17.27 kN The actual disassembly force is usually ≤ 5 kN, and the interference amount of the spline fit is generally ≤ 0.05 mm, corresponding to a separation force of about 3-4 kN - Connection between the sheet body and the rod: Integrally forged + transition fillet R1-R2 design is adopted to eliminate stress concentration. According to the shear strength calculation, the shear force of the connection surface τ = F / 2 ÷ (π × 5 × 1.2) ≈ F / 2 ÷ 18.85 ≈ (2 kN) / 18.85 ≈ 106 MPa, which is much smaller than the shear yield strength of 65Mn ≈ 500 MPa.

[0035] - Hook part of the sheet body: Thickness 1.2 mm, hook contact width ≥ 3 mm, shear area ≈ 3.6 mm², shear force ≈ F / 2 ÷ 2 = 500 N per side, shear stress ≈ 500 N ÷ 3.6 mm² ≈ 139 MPa < 500 MPa, meeting the strength requirements.

[0036] III. Verification of working condition adaptability 1. Strength compensation under space constraints: The sheet thickness is only 1.2 mm, which is suitable for a 2 mm gap, but through the "two-sided hook tooth root" design, the single-point force is converted into a double-tooth share, reducing the unit area load; the rod diameter is 5-8 mm, achieving a balance between strength and space in a narrow space.

[0037] 2. Actual test data: The straight gear with an interference of 0.03-0.05 mm and a weight of less than 5 kg is tested for disassembly, the maximum tension of the hook assembly is about 3.2 kN, which is much lower than the allowable tension of 17.27 kN, and there is no plastic deformation after unloading, and the change in the straightness of the rod body is less than 0.02 mm through the dial gauge detection.

[0038] Conclusion The material selection of the hook assembly 65Mn spring steel, the symmetrical force structure design, the transition fillet, and the size parameters of the rod body diameter of 5-8 mm and the thickness of the sheet body of 1.2 mm can meet the disassembly requirements, and the strength reserve safety factor of about 5 is sufficient to cope with the conventional disassembly conditions of the embedded straight gear, and will not cause fracture or plastic deformation failure.

[0039] The working principle of the disassembly tool for the even-tooth embedded straight gear in the embodiment can be summarized as a synergistic mechanism of "symmetrical hooking-coaxial force application-stable separation", which is as follows: 1. Symmetrical positioning and reliable hooking By utilizing the structural characteristics of the even-tooth straight gear relative to the tooth center line, the sheet body is inserted between the straight gear and the bottom surface of the sink through two centrally symmetric hook assemblies, the two sides of the hook are in contact with the adjacent tooth root and hook the edge of the gear bottom surface, forming a two-point symmetrical mechanical lock, ensuring uniform distribution of the force transmission points and avoiding force deviation of the gear.

[0040] 2. Coaxial centering and force transmission The threaded top rod is tightly matched with the gear shaft center hole through the conical surface centering part, ensuring that the force application axis coincides with the gear shaft axis; the cross arm serves as an intermediate force transmission medium, converting the axial thrust of the threaded top rod into upward tension on the slider, and then transmitting it to the sheet body through the rod body, forming a complete force transmission chain of "top rod-cross arm-slider-hook assembly-straight gear".

[0041] 3. Screw transmission and stable separation By means of the screw pair structure of the threaded top rod and the cross arm, the rotational motion of the wrench is converted into the linear upward motion of the cross arm, and by controlling the rotation speed, the slow application of tension is achieved to avoid impact load, so that the straight gear is smoothly separated from the spline along the gear shaft axis, and finally taken out from the sink.

[0042] The whole process ensures balanced force through structural symmetry, controllable force through screw transmission, and thin sheet hooking structure adapting to narrow space, which solves the disassembly problem of even-tooth embedded straight gears without pre-reserved disassembly structure in a compact space.

[0043] In embodiment 2, as shown in Fig. 1-10 , 12, a disassembly tool for an odd-tooth embedded straight gear, which is different from embodiment 1: Two groups of second screw holes 43 are symmetrically arranged on both sides of the T-shaped groove 41 of the cross arm 4 along the length direction of the cross arm, each group having two screw holes, and the distance between the screw holes along the length direction of the T-shaped groove is 15-20 mm. The screw hole specification is M4-M6. The inner screw top wire 8 is made of 45# steel and is subjected to quenching and tempering treatment. The end part is provided with a brass wear-resistant gasket. The width of the sliding block 6 is 2-4 mm smaller than the width of the T-shaped groove 41, forming a transverse adjustment gap. By tightening / loosening the top wire 8 on both sides of the T-shaped groove, the sliding block 6 can be pushed to realize a width direction displacement of ±1-2 mm and an inclination angle adjustment of ±5° in the T-shaped groove.

[0044] The remaining structure is consistent with that of Example 1, including that the length of the cross arm 4 is 5-10 mm smaller than the outer diameter of the spur gear 1, the taper angle of the conical centering part of the threaded top rod 5 is 60°±5°, the rod body 71 of the hook assembly 7 has a diameter of 5-8 mm, and the thickness of the sheet body 72 is 1.2 mm, and the material of the sheet body 72 is 65Mn spring steel. Moreover, the two hook assemblies 7 are still symmetrically distributed relative to the center of the first screw hole 42.

[0045] The difference between the fitting operation steps of the odd-toothed gear and those of Example 1 is as follows: Installation of the first hook assembly: one hook assembly 7 is inserted from the wide diameter section of the sink groove 21, the top wire 8 on both sides of the T-shaped groove 41 at the A end is adjusted, the sliding block 6 drives the rod body 71 to be accurately placed in the target tooth gap of the spur gear 1, the sheet body 72 is inserted into the gap, the sliding block position is fixed by tightening the top wire 8 to ensure that the hook part of the sheet body is attached to the tooth root. Position rotation: the gear shaft 3 is rotated to a position of 180°. At this time, because the spur gear 1 is an odd-toothed gear, the other set of teeth to be hooked deviates from the original symmetric position by ±(180° / number of teeth) angle relative to the shaft center, resulting in that the rod body 71 at the B end cannot be directly aligned with the tooth gap. Installation of the second hook assembly: the other hook assembly 7 is inserted from the wide diameter section of the sink groove 21, and the following steps are taken to fit the offset tooth gap: ①Transverse adjustment: the top wire 8 on one side of the T-shaped groove at the B end is loosened, the top wire on the other side is tightened, the sliding block 6 is translated along the width direction, and the rod body 71 is aligned with the radial projection position of the offset tooth gap. ②Angle fine adjustment: the top wires 8 at both ends of the sliding block 6 are asymmetrically tightened, for example, the top wire at the front end is tightened and the top wire at the rear end is slightly loosened, so that the sliding block 6 drives the rod body 71 to produce a slight inclination, ensuring that the rod body 71 is consistent with the axial direction of the offset tooth gap. ③Fixed limiting: after the rod body 71 is completely placed in the offset tooth gap and the sheet body 72 hooks the gear bottom surface, the top wires 8 on both sides at the B end are simultaneously tightened, and the sliding block 6 is rigidly fixed by the counteracting force of the top wires on both sides. Force application and disassembly: consistent with step 8 of Example 1, force is applied by the threaded top rod 5. At this time, the top wires 8 on both sides form rigid limiting, ensuring that the two hook assemblies 7 correspond to different tooth gaps but can still transmit symmetric tension, so that the spur gear 1 is smoothly detached.

[0046] In another preferred embodiment, a recess 45 is arranged in the middle of the lower surface of the cross arm 4, the depth of the recess 45 is greater than the height of the gear shaft 3 protruding above the upper surface of the spur gear 1, and the width of the recess 45 is greater than the outer diameter of the gear shaft 3, so as to avoid the part of the gear shaft 3 protruding above the upper surface of the spur gear 1. Through the targeted design of the depth and width of the recess 45, the part of the gear shaft protruding above the upper surface of the spur gear can be accurately avoided, and the problem that the cross arm cannot be placed flat due to the protrusion of the gear shaft is solved. The lower surface of the cross arm is always in contact with the upper surface of the spur gear, avoiding the inclination of the cross arm and the generation of partial load during force application, and at the same time, sufficient space is reserved for the gear shaft to prevent interference between the cross arm and the gear shaft during disassembly, thereby ensuring the linearity and stability of the force transmission path.

[0047] In another preferred embodiment, the top wall of the T-shaped groove 41 extends upward to form an avoidance groove 44; the sliding block 6 is provided with a conical hole 61 extending in the up-down direction near the outer end position, the conical hole 61 has a taper structure with a large upper part and a small lower part, and the minimum inner diameter of the conical hole 61 is greater than or equal to the outer diameter of the rod body 71; and two symmetrically arranged wedge-shaped clamping tiles 9 are further included, the outer peripheral surface of the wedge-shaped clamping tile 9 is a tapered surface matched with the conical hole 61, and the inner peripheral surface is a circular arc surface matched with the outer peripheral surface of the rod body 71; when the wedge-shaped clamping tile 9 is placed in the conical hole 61, the outer peripheral surface and the tapered surface of the conical hole 61 form a wedge-tight structure, the inner peripheral surface is tightly matched with the outer peripheral surface of the rod body 71, and the upper ends of the wedge-shaped clamping tile 9 and the rod body 71 are accommodated in the avoidance groove 44. The avoidance groove 44 provides installation space for the upper ends of the wedge-shaped clamping tile 9 and the rod body 71, avoiding interference of exposed components; the tapered surface of the conical hole 61 and the wedge-shaped clamping tile 9 form a self-locking wedge-tight structure, which can quickly realize reliable clamping of the rod body and the sliding block, and the clamping force can be adjusted by knocking the tile to adapt to the fixing needs of rod bodies of different diameters. This structure takes into account the connection strength and the convenience of disassembly, and is convenient for adjusting the distance between the sliding block and the tile according to the thickness of the spur gear, thereby improving the adaptability of the tool to different specifications of the spur gear.

[0048] In another preferred embodiment, the force applying part of the threaded jacking rod 5 is a regular hexagonal structure, which is matched with a standard forked wrench. Compared with an inner hexagonal structure, the clamping area of the forked wrench is larger, and when disassembling a gear that is tightly matched, a larger torque can be transmitted without slipping. The fit between the wrench and the force applying part is more stable during the force applying process, which is especially suitable for scenes that require repeated tightening of the force, reduces the operation fatigue, and improves the operation safety in heavy load working conditions.

[0049] In another preferred embodiment, the rod body 71 is a circular rod with a diameter of 2-5 mm, and the sheet body 72 is a circular sheet with an outer diameter of 5-10 mm, both of which are machined after being integrally forged from 65Mn spring steel, and the connecting part of the rod body 71 and the sheet body 72 is provided with a transition round corner with a radius of 1-2 mm. The rod body 71 and the sheet body 72 are machined after being integrally forged from 65Mn spring steel, combined with the design of the transition round corner, which significantly improves the structural integrity and fatigue resistance. The high tensile strength and elasticity of 65Mn ensure that the assembly is not easily broken when subjected to large tension, and the transition round corner effectively eliminates the stress concentration at the connecting part of the rod body and the sheet body. The one-piece forming process avoids the weak point of separate connection, is suitable for long-term repeated use, and is suitable for disassembly scenes with high strength requirements for the pull hook.

[0050] In another preferred embodiment, the rod body 71 is a circular rod with a diameter of 2-5 mm and made of 65Mn spring steel, and the lower end of the rod body is provided with a circumferential annular groove. The sheet body 72 is a carbon fiber sheet with an outer diameter of 5-10 mm and a thickness of 0.8-1.2 mm, and a mounting hole adapted to the lower end of the rod body is formed in the center of the sheet body, and a protrusion cooperating with the annular groove is provided on the inner wall of the mounting hole. Both are bonded by high-strength epoxy resin adhesive, and the annular groove and the protrusion form a mechanical locking structure. The carbon fiber sheet 72 has a thickness of only 0.8-1.2 mm, which can adapt to the gap between the straight gear and the sink of ≤1 mm. Its lightweight and high-strength characteristics can reduce the weight of the pull hook assembly and improve the operation flexibility. The annular groove of the rod body 71 and the protrusion of the sheet body mounting hole form a mechanical locking, combined with high-strength epoxy resin adhesive, to realize "mechanical locking + chemical bonding" double fixation, solve the problem of easy disengagement of dissimilar materials metal and carbon fiber connection, and balance the connection reliability and thin wall adaptability, especially suitable for narrow gap or weight sensitive working conditions.

[0051] In another preferred embodiment, in step 2), when the upper end of the rod body 71 is fixed with the sliding block 6, the upper end of the rod body 71 is first inserted from the lower end of the conical hole 61, the distance between the lower surface of the sliding block 6 and the upper surface of the sheet body 72 is adjusted, then the two wedge-shaped clamping tiles 9 are inserted from the upper end of the conical hole 61, and then the upper end of the two wedge-shaped clamping tiles 9 is clamped by hammering with a copper hammer and a copper drill. When disassembling, the lower end of the two wedge-shaped clamping tiles 9 is loosened by hammering with a copper hammer and a copper drill. This step realizes self-locking fixation by the taper surface cooperation of the conical hole and the wedge-shaped clamping tile through the operation process of "rod body insertion → distance adjustment → tile insertion → clamping by hammering", which ensures that the connection strength of the rod body and the sliding block is controllable. The greater the hammering force, the stronger the clamping force. The use of copper hammer and copper drill avoids the damage to the parts caused by the knocking of iron tools, such as deformation of wedge-shaped tiles and scratches on the surface of the rod body, and the reverse hammering can loosen the disassembly, which balances the connection reliability and disassembly convenience. At the same time, the distance between the sliding block and the sheet body can be adjusted flexibly according to the thickness of the straight gear, which improves the adaptability of the tool to gears of different thicknesses.

[0052] In another preferred embodiment, in steps 5) and 7), the slide 6 is limited and adjusted in the width direction in the T-shaped groove 41 by adjusting the top wire 8 on both sides respectively, so that the rod body 71 accurately enters the interdental space of the two closest teeth of the straight gear 1. By adjusting the top wire on both sides respectively, the displacement and small inclination angle of the slide in the width direction of the T-shaped groove can be accurately controlled, ensuring that the rod body is accurately aligned with the target interdental space of the straight gear, especially in the case of odd tooth gears which are difficult to naturally align due to interdental offset. The fine adjustment characteristics of the top wire, such as 0.7-1mm per circle, can compensate for processing or assembly errors, so that the two hook assemblies always maintain a symmetrical force state relative to the center of the threaded rod, avoiding single-sided force on the gear and tooth damage caused by rod body misalignment, significantly improving the stability and accuracy of the disassembly process.

[0053] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A disassembly tool for an embedded spur gear, characterized in that, include The crossbeam (4) has a length less than or equal to the outer diameter of the spur gear (1), and T-slots (41) extending along the length direction and open at the bottom are respectively opened at both ends, and a first screw hole (42) extending along the vertical direction is opened in the middle. The threaded push rod (5) has an external thread that is screwed into the first threaded hole (42) on the rod part, a non-circular force-applying part at the top end, and a conical centering part at the bottom end that is adapted to the center hole (31) of the gear shaft (3). Two sliders (6) can be inserted into the T-slot (41) from the end of the T-slot (41), and their length and width are less than or equal to the length and width of the T-slot (41); Two hook assemblies (7) include a rod (71) that can be inserted between the teeth of a spur gear (1) and a plate (72) located between the spur gear (1) and the recess (21) of the housing (2). The plate (72) has a thickness of less than or equal to 1.5 mm and can hook the tooth sides and / or tooth roots of two adjacent teeth of the spur gear (1) on both sides. The upper end of the rod (71) is fixed to the slider (6) and the lower end is fixed to or integrated with the plate (72). The two hook assemblies (7) are symmetrically distributed with respect to the center of the first screw hole (42).

2. The disassembly tool for an embedded spur gear according to claim 1, characterized in that, Two second screw holes (43) extending along the width direction of the crossarm (4) are respectively opened on the crossarm (4) on both sides of the T-slot (41). The set screw (8) is screwed into the second screw hole (43). When the width of the slider (6) is less than the width of the T-slot (41), the slider (6) can be limited and its position in the width direction of the T-slot (41) can be adjusted by adjusting the set screw (8).

3. The disassembly tool for an embedded spur gear according to claim 1, characterized in that, The lower surface of the crossarm (4) is provided with a recess (45) in the middle. The depth of the recess (45) is greater than the height of the gear shaft (3) extending beyond the upper surface of the spur gear (1), and the width is greater than the outer diameter of the gear shaft (3) so as to avoid the portion of the gear shaft (3) extending beyond the upper surface of the spur gear (1).

4. The disassembly tool for an embedded spur gear according to claim 1, characterized in that, The top wall of the T-slot (41) extends upward to form a clearance groove (44); the slider (6) has a conical hole (61) extending in the vertical direction near its outer end. The conical hole (61) has a conical structure that is larger at the top and smaller at the bottom, and its minimum inner diameter is greater than or equal to the outer diameter of the rod (71); it also includes two symmetrically arranged wedge-shaped clamping tiles (9). The outer circumferential surface of the wedge-shaped clamping tile (9) is a conical surface that matches the conical hole (61), and the inner circumferential surface is an arc surface that fits the outer circumferential surface of the rod (71); when the wedge-shaped clamping tile (9) is placed in the conical hole (61), its outer circumferential surface and the conical surface of the conical hole (61) cooperate to form a wedge-tight structure, and its inner circumferential surface and the outer circumferential surface of the rod (71) are tightly fitted together, and the upper ends of the wedge-shaped clamping tile (9) and the rod (71) are both accommodated in the clearance groove (44).

5. The disassembly tool for an embedded spur gear according to claim 1, characterized in that, The force-applying part of the threaded push rod (5) is a regular hexagonal structure, which is compatible with a standard fork wrench; or the force-applying part of the threaded push rod (5) is an internal hexagon countersunk structure, with the internal hexagon countersunk located on the cylindrical nail head at the top of the threaded push rod, and the diameter of the nail head being larger than the diameter of the threaded push rod, which is compatible with a standard internal hexagon wrench.

6. The disassembly tool for an embedded spur gear according to claim 1, characterized in that, The rod (71) is a round rod with a diameter of 2-5mm, and the plate (72) is a round plate with an outer diameter of 5-10mm. Both are made of 65Mn spring steel and are integrally forged and machined. The connection between the rod (71) and the plate (72) is provided with a transition fillet with a radius of 1-2mm.

7. The disassembly tool for an embedded spur gear according to claim 1, characterized in that, The rod (71) is a round rod with a diameter of 2-5mm and made of 65Mn spring steel. The lower end of the rod is provided with a circumferential annular groove. The sheet (72) is a carbon fiber sheet with an outer diameter of 5-10mm and a thickness of 0.8-1.2mm. The center of the sheet is provided with an installation hole that matches the lower end of the rod. The inner wall of the installation hole is provided with a protrusion that matches the annular groove. The two are bonded together with a high-strength epoxy resin adhesive, and the annular groove and the protrusion form a mechanical locking structure.

8. A method of using a disassembly tool for an embedded spur gear according to any one of claims 1-7, characterized in that, It includes the following steps: 1) Pre-treatment: clean the gap between the spur gear (1) and the sink groove (21) of the housing (2) and remove impurities from the top of the gear shaft (3) to ensure that there are no foreign objects in the operating space; 2) Assemble the hook assembly and fix the upper end of the rod (71) of the two hook assemblies (7) to the slider (6) so that the distance between the lower surface of the slider (6) and the upper surface of the plate (72) is greater than or equal to the thickness of the spur gear (1); 3) Install the crossbeam and place the crossbeam (4) on the upper surface of the spur gear (1) so that its A end corresponds to the wide diameter section of the countersink (21) and its B end corresponds to the narrow diameter section of the countersink (21); 4) Centering: Screw the threaded push rod (5) into the first threaded hole (42) of the crossarm (4) so ​​that the centering part of the lower conical surface fits into the center hole (31) of the gear shaft (3) and the lower surface of the crossarm (4) does not detach from the upper surface of the spur gear (1). 5) Install the first hook assembly, insert one hook assembly (7) from the wide diameter section of the sinker (21) toward the end of the T-slot (41) at end A, and insert the plate (72) from the wide diameter section of the sinker (21) between the spur gear (1) and the bottom surface of the sinker (21), and insert the rod (71) into the space between the two closest teeth of the spur gear (1); 6) Reverse the direction and rotate the gear shaft (3) 180° so that the A end of the crossarm (4) corresponds to the narrow section of the sinker (21) and the B end corresponds to the wide section of the sinker (21); 7) Install the second hook assembly, insert another hook assembly (7) from the wide diameter section of the sinker (21) toward the end of the T-slot (41) at end B, and insert the plate (72) from the wide diameter section of the sinker (21) between the spur gear (1) and the bottom surface of the sinker (21), and insert the rod (71) into the space between the two closest teeth of the spur gear (1); 8) Apply force to disassemble, fix the crossarm (4), use the appropriate wrench to clamp the force application part of the threaded top rod (5), slowly rotate the threaded top rod (5) clockwise, drive the crossarm (4) to move upward through the threaded transmission, the crossarm (4) pulls the hook assembly (7) through the slider (6), so that the spur gear (1) is smoothly disengaged along the gear shaft (3) axially, and the disassembly is completed.

9. A method of using a disassembly tool for an embedded spur gear according to claim 8, characterized in that, In step 2), when fixing the upper end of the rod (71) to the slider (6), first insert the upper end of the rod (71) through the lower end of the conical hole (61), adjust the distance between the lower surface of the slider (6) and the upper surface of the plate (72), then insert the two wedge-shaped clamping tiles (9) from the upper end of the conical hole (61), and then use a copper hammer and copper chisel to wedge the upper end of the two wedge-shaped clamping tiles (9) tightly; when removing, use a copper hammer and copper chisel to knock the lower end of the two wedge-shaped clamping tiles (9) to loosen them.

10. A method of using a disassembly tool for an embedded spur gear according to claim 8, characterized in that, In steps 5) and 7), the slider (6) is limited and its position in the width direction within the T-slot (41) is adjusted by adjusting the set screws (8) on both sides respectively, so that the rod (71) accurately enters the space between the two closest teeth of the spur gear (1).

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