A steel bowl assembly jig for a motorcycle frame head pipe and a method of using the same

Abstract

This invention discloses a jig for assembling steel cups for a motorcycle frame steering tube and its usage method. The jig includes a pull rod adapted to the inner hole of the steering tube. A first steel cup assembly is fixed to the output end of a drive element. One end of the pull rod coaxially passes through the first steel cup assembly and is coaxially fixed to the piston rod of the drive element. The other end is detachably fitted with a second steel cup assembly. A main quick-release locking mechanism is provided between the second steel cup assembly and the pull rod, which can selectively lock or release: when unlocking, the second steel cup assembly can slide or be removed along the pull rod; when locking, the second steel cup assembly is relatively fixed and locked to the pull rod. This invention uses the pull rod passing through the steering tube as a forced coaxial reference, ensuring that the two steel cup assemblies are always coaxial. This eliminates axial offset caused by frame deformation, assembly errors, or guide clearances, ensuring consistent concentricity after the upper and lower steel cups are pressed in, avoiding misalignment of the working surfaces, reducing the resistance of the steel ball rotation, preventing local plastic deformation of the steel cups, ensuring smooth steering of the steering wheel, and extending its service life.

Description

Technical Field

[0001] This invention relates to the field of vehicle frame processing equipment technology, specifically to a steel cup assembly fixture for motorcycle frame stem tubes and its usage method. Background Technology

[0002] Electric vehicles, motorcycles, and other small vehicles have a faucet tube at the front of the frame for mounting the faucet. Steel cups need to be pressed into both ends of the faucet tube so that the internal steel balls can rotate the faucet. The traditional process uses a split assembly: first, the steel cup is manually hammered into one end, and then the frame is flipped over to assemble the other end. This process has problems such as high labor intensity, low efficiency, inaccurate initial positioning of the steel cup which can easily lead to deformation, sluggish movement of the steel balls, and heavy faucet rotation.

[0003] To address this, the industry has developed dual-end synchronous pressing equipment, as shown in patents ZL201320580560.X and CN201410734517.3. This equipment significantly improves the assembly efficiency of the steel cups at both ends of the faucet tube by simultaneously applying pressure to both ends of the tube using opposing pressing heads. However, the upper and lower pressing head components of such equipment are separate, independently driven structures, each mounted on the base and horizontal plate, lacking rigid coaxial constraint. During the pressing process, due to frame deformation, assembly errors, or guide clearances, the axes of the pressing heads at both ends are prone to offset or tilting, resulting in poor concentricity of the upper and lower steel cups after they are pressed into the faucet tube. This coaxiality deviation not only affects the fitting accuracy between the steel cup and the tube opening but also causes the working surfaces of the steel cups at both ends to become non-coaxial, increasing the resistance of the steel ball rotation and even causing local overload and plastic deformation of the steel cup, ultimately affecting the smoothness and service life of the faucet's steering.

[0004] To address this issue, the present invention proposes a steel cup assembly fixture for motorcycle frame stem tubes and its usage method, aiming to overcome the problem of poor coaxial alignment of the upper and lower steel cups after they are pressed into the stem tubes due to the separate upper and lower pressure head structure in existing double-end pressing equipment. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a steel cup assembly fixture for a motorcycle frame steering tube and its usage method. By setting a pull rod that penetrates the inner hole of the steering tube, and coaxially fixing the steel cup assembly to the output end of the drive element, while a second steel cup assembly is detachably sleeved onto the other end of the pull rod, the pull rod serves as a forced rigid coaxial constraint reference, ensuring that the two steel cup assemblies are always coaxial. Simultaneously, the main quick-release locking mechanism allows the second steel cup assembly to slide freely along the pull rod or be removed during unlocking (facilitating loading and unloading), and during locking, it fixes the second steel cup assembly relative to the pull rod to transmit the pressing force. This structure effectively eliminates the axial offset or tilt of the two steel cup assemblies caused by frame deformation, assembly errors, or guide clearance, ensuring that the concentricity of the upper and lower steel cups is consistent after being pressed into both ends of the steering tube, avoiding misalignment of the working surfaces of the two steel cups, thereby significantly reducing the running resistance of the steel balls, preventing local plastic deformation of the steel cups, and ultimately ensuring smooth steering and extending the service life of the steering wheel.

[0006] One objective of this invention is to design a jig for assembling a steel cup for a motorcycle frame stem tube, comprising a pull rod, a drive element, a first steel cup pressing assembly, and a second steel cup pressing assembly. The pull rod is adapted to the inner hole of the stem tube, the first steel cup pressing assembly is adapted to the first steel cup, and the second steel cup pressing assembly is adapted to the second steel cup. The first steel cup pressing assembly is fixedly installed at the output end of the drive element. One end of the pull rod coaxially passes through the central through hole of the first steel cup pressing assembly and is coaxially fixedly connected to the piston rod end of the drive element. The other end of the pull rod is detachably fitted with the second steel cup pressing assembly. A main quick-release locking mechanism is provided between the second steel cup pressing assembly and the pull rod. The main quick-release locking mechanism is used to selectively lock the second steel cup pressing assembly onto the pull rod or release it to allow the second steel cup pressing assembly to slide along the pull rod.

[0007] The main quick-release locking mechanism has two states: unlocked and locked. When it is in the unlocked state, the second pressure cup assembly can slide along the axial direction of the pull rod or be removed from the pull rod. When it is in the locked state, the second pressure cup assembly is fixed and locked relative to the pull rod.

[0008] This invention discloses a jig for assembling steel cups for a motorcycle frame steering tube. By setting a pull rod that penetrates the inner hole of the steering tube, a steel cup assembly is coaxially fixed to the output end of a drive element, and a second steel cup assembly is detachably sleeved onto the other end of the pull rod. The pull rod serves as a forced, rigid, coaxial constraint reference, ensuring that the two steel cup assemblies are always coaxial. Simultaneously, a main quick-release locking mechanism allows the second steel cup assembly to slide freely along the pull rod or be removed during unlocking (facilitating loading and unloading), and during locking, it fixes the second steel cup assembly relative to the pull rod to transmit pressing force. This structure effectively eliminates axial offset or tilting of the two steel cup assemblies caused by frame deformation, assembly errors, or guide clearance, ensuring consistent concentricity after the upper and lower steel cups are pressed into both ends of the steering tube. This avoids misalignment of the working surfaces of the two steel cups, significantly reducing the resistance of the steel ball operation, preventing localized plastic deformation of the steel cups, and ultimately ensuring smooth steering and extending the service life of the steering wheel.

[0009] A preferred technical solution is that the piston rod of the drive element extends downwards, a suspension assembly is fixedly mounted on the top of the drive element, and a downward-extending handle is also provided on the drive element. A momentary control switch for controlling the movement of the drive element is installed on the handle. The downward-extending piston rod, in conjunction with the top suspension assembly, enables a suspended online layout, saving ground space and facilitating vehicle entry and exit. The downward-extending handle and the momentary control switch allow the operator to perform close-range momentary control of the pressing action while holding the fixture. This operation is intuitive and responsive, facilitating fine-tuning of alignment at the beginning of the pressing process and preventing damage to the steel cup or pipe opening due to uncontrolled stroke.

[0010] A further preferred technical solution is that the steel cup assembly includes a straight cylinder, a core ring, and a flange. The straight cylinder is vertically fixed to the center of the lower end face of the flange. The upper end of the core ring is coaxially fixedly connected to the lower end of the straight cylinder. The core ring is fitted into the inner cavity of the steel cup. The flange is fixedly installed to the output end of the drive element by a screw assembly.

[0011] The second steel cup pressing assembly includes a second straight cylinder and a second core ring. The lower end of the second core ring is coaxially and fixedly connected to the upper end of the second straight cylinder. The second core ring is fitted into the inner cavity of the second steel cup. The main quick-release locking mechanism is provided between the second straight cylinder and the lower end of the pull rod. By fitting the first core ring into the inner cavity of the first steel cup and the second core ring into the inner cavity of the second steel cup, the force is evenly distributed on the end face of the inner cavity of the steel cup during pressing. The flange is fixed to the output end of the drive element by a screw assembly, ensuring the installation stability of the first steel cup pressing assembly. The first and second straight cylinders serve as the connecting and load-bearing bodies, respectively, so that the pressing force can be smoothly transmitted to the core ring, avoiding the steel cup from tilting during pressing, effectively improving the perpendicularity of the pressing end face, thereby ensuring that the steel cups at both ends are accurately fitted and have excellent stability when assembled with the pressing head assembly.

[0012] A further preferred technical solution is that the lower end of the pull rod is milled to form a connecting section, the outer diameter of the connecting section is smaller than the outer diameter of the main body of the pull rod, and a plurality of arc-shaped locking blocks and a plurality of longitudinal grooves are alternately arranged on the outer circumferential surface of the middle part of the connecting section, the outer convex arc surfaces of the plurality of arc-shaped locking blocks are located on the same circumference, and the outer diameter of the circumference is smaller than the inner diameter of the steel cups one and two.

[0013] The inner circumferential surface of the straight cylinder 2 is provided with a plurality of arc-shaped locking blocks 2 at intervals. The inner concave arc surfaces of the plurality of arc-shaped locking blocks 2 are located on the same circumference. The inner diameter of the circumference is smaller than the outer diameter of the circumference. A longitudinal groove 3 is formed between two adjacent arc-shaped locking blocks 2. The plurality of arc-shaped locking blocks 2, the plurality of arc-shaped locking blocks 1, and the plurality of longitudinal grooves 1 and longitudinal grooves 3 are correspondingly matched to form the main quick-release locking mechanism.

[0014] When in the unlocked state, several of the arc-shaped locking blocks 2 are aligned with several of the longitudinal grooves one by one, and several of the arc-shaped locking blocks 1 are aligned with several of the longitudinal grooves 3, allowing the pressure steel bowl assembly 2 to slide freely along the connecting section; when in the locked state, several of the arc-shaped locking blocks 2 slide through several of the longitudinal grooves 1 to the upper end of the connecting section and rotate relative to each other by a certain angle, so that several of the arc-shaped locking blocks 2 overlap one by one with the upper end face of several of the arc-shaped locking blocks 1, thereby achieving axial limiting and locking. By utilizing the arc-shaped locking block 1 and longitudinal groove 1 on the lower connecting section of the pull rod, and in conjunction with the arc-shaped locking block 2 and longitudinal groove 3 on the inner wall of the straight cylinder 2 of the steel cup assembly 2, a quick-release structure similar to a "buckle-rotary lock" is formed. When unlocking, each locking block and groove 1 are aligned, and the steel cup assembly 2 can be freely slid off. When locking, relative rotation causes the arc-shaped locking block 1 to overlap with the upper end face of the arc-shaped locking block 1. This structure can achieve quick assembly and disassembly without tools, and the overlapping surface can withstand the huge axial pressing force when the pull rod is pulled back. Compared with conventional threaded or pin connections, it has both convenient assembly and disassembly and high load-bearing pull-out resistance, which helps to ensure that the steel cups at both ends are stably and efficiently pressed into the two ends of the faucet pipe, and also greatly improves the efficiency of loading and unloading.

[0015] A further preferred technical solution is that a plurality of longitudinal grooves are provided circumferentially at intervals on the outer peripheral surface of the upper end of the connecting segment, and the plurality of longitudinal grooves are distributed one-to-one on the upper side of the middle of the plurality of arc-shaped blocks.

[0016] The straight cylinder 2 is provided with a plurality of radially spaced holes, each corresponding to one of the arc-shaped locking blocks 2. A spring plug is installed in each of the radially through holes. When the main quick-release locking mechanism is in the locked state, the ball of the spring plug engages in the corresponding longitudinal groove 2. The longitudinal grooves 2, the radially through holes, and the spring plugs together constitute a secondary quick-release locking mechanism, used for radial auxiliary positioning in the locked state. In the locked state, the ball of the spring plug automatically engages in the longitudinal groove 2, forming a radial auxiliary positioning structure. This secondary quick-release locking mechanism prevents accidental unlocking during the pressing process due to vibration or accidental contact causing circumferential rotation of the steel cup assembly 2 relative to the pull rod, effectively improving the safety of the pressing operation and the long-term reliability of the locked state, while not affecting the convenience of quick unlocking operation of the main quick-release locking mechanism.

[0017] A further preferred technical solution is that the steel cup assembly one further includes a guide cylinder one, the upper end of the guide cylinder one is coaxially and fixedly connected to the lower end of the core ring one, and the outer diameter of the guide cylinder one is smaller than the inner diameter of the steel cup one;

[0018] The steel cup assembly 2 also includes a guide cylinder 2 and a straight cylinder 3. The lower end of the guide cylinder 2 is coaxially and fixedly connected to the upper end of the core ring 2. The outer diameter of the guide cylinder 2 is smaller than the inner diameter of the steel cup 2. The straight cylinder 3 is milled from the lower end of the straight cylinder 2, and the outer diameter of the straight cylinder 3 is smaller than the outer diameter of the straight cylinder 2. By adding a guide cylinder to the outside of the free end of the core ring, and the outer diameter of the guide cylinder is smaller than the inner diameter of the steel cup, the guide cylinder first extends into the inner hole of the steel cup for pre-guidance before the steel cup is officially pressed in. This effectively corrects the slight deviation when the steel cup is fitted into the pull rod, so that the steel cup smoothly transitions to the core ring mounting position, avoiding scratches or bumps on the inner wall of the steel cup or the end of the faucet tube due to direct hard contact with the edge of the core ring, thus improving the surface quality of the finished product.

[0019] A further preferred technical solution is that both the lower end of the guide cylinder one and the upper end of the guide cylinder two are provided with a tapered guide structure that gradually tapers towards the free end, used to guide the centering and insertion of the steel cup and the corresponding core ring. The tapered guide structure (such as a chamfer or conical surface) provided at the free end of the guide cylinder acts as a "funnel" guide when the steel cup is inserted. Even if there is a slight radial misalignment between the steel cup and the core ring, it can be smoothly guided to the correct insertion position by the slope of the conical surface, thereby reducing the centering accuracy requirements for operators when manually inserting the steel cup, preventing deformation of the steel cup due to inaccurate initial positioning, and effectively improving the pressing qualification rate.

[0020] A preferred technical solution further includes a hydraulic cylinder as the driving element, which is externally connected to a hydraulic system. The suspension assembly includes a ramp, a ramp, and limiting rings. The ramp is fixedly installed on the top of the hydraulic cylinder and extends outward and upward. The high end of the ramp is fixedly installed on the ramp, and a limiting end cap is fixedly installed on the low end of the ramp. At least two adjustable limiting rings are fitted onto the ramp. The hydraulic cylinder, as the driving element, provides a stable and large pressing force. The suspension assembly suspends the fixture on the production line frame through the ramp and ramp, saving space and providing good rigidity. The ramp has at least two adjustable limiting rings, which can be used to limit the suspension height of the steel cup assembly or the frame head tube.

[0021] A further preferred technical solution is that a horizontal plate is fixedly mounted on one side of the drive element, and the upper end of the handle lever is fixedly mounted on the horizontal plate. An electrical control element is mounted on the upper surface of the horizontal plate, and the momentary control switch is electrically connected to the hydraulic system through the electrical control element. By directly integrating the electrical control element onto the side of the drive element through the horizontal plate, and fixing the handle lever to the horizontal plate, the cable path between the momentary control switch and the electrical control element is extremely short, effectively reducing the risk of loose wiring or signal delay. This ensures that the momentary control switch responds more sensitively to the control of the hydraulic system, while also making the overall structure of the fixture more compact, neat, and easy to maintain.

[0022] The second objective of this invention is to design a method for using a steel cup assembly fixture based on the aforementioned motorcycle frame stem tube, comprising the following operational steps:

[0023] S1: Preset piston rod extension stroke of the drive element, start the drive element to extend its piston rod to the preset stroke;

[0024] S2: Connect steel bowl one, faucet pipe and steel bowl two to the pull rod in sequence, with the open end of steel bowl one facing the pressing steel bowl assembly one, and connect pressing steel bowl assembly two to the end of the pull rod adjacent to steel bowl two, with the open end of steel bowl two facing the pressing steel bowl assembly two. Then switch the main quick-release locking mechanism from the unlocked state to the locked state.

[0025] S3: Activate the drive element to retract its piston rod, and drive the second steel cup assembly to move closer to the first steel cup assembly via the pull rod, so that the first and second steel cups are simultaneously pressed into both ends of the faucet tube;

[0026] S4: Switch the main quick-release locking mechanism from the locked state to the unlocked state, remove the second steel cup assembly, and then remove the pressed faucet pipe, steel cup one, and steel cup two from the pull rod to complete one pressing cycle.

[0027] The present invention discloses a method for using a steel cup assembly fixture based on the aforementioned motorcycle frame stem tube. In step S1, a piston rod is pre-set and extended to provide sufficient operating space for fitting the steel cups at both ends and the stem tube. In step S2, a pull rod is used to connect all workpieces in series and lock the second steel cup assembly. In step S3, the drive element retracts (pull rod back) instead of being pushed out for pressing, so that the pull rod bears tensile load, avoiding the risk of instability and bending of the slender rod under pressure. At the same time, the rigidity of the pull rod ensures that the steel cups at both ends are pressed in synchronously. In step S4, the material is quickly unlocked and unloaded. The entire process is simple to operate, has high pressing synchronization, and uses the pull rod's pull-back action to complete the pressing, fundamentally eliminating the skew problem caused by inconsistent thrust direction in traditional split-type press heads, significantly improving the efficiency and consistency of mass production.

[0028] The advantages and beneficial effects of this invention are as follows:

[0029] 1. The present invention provides a steel cup assembly fixture for a motorcycle frame steering tube. By setting a pull rod that penetrates the inner hole of the steering tube, a steel cup assembly is coaxially fixed to the output end of a drive element, and a second steel cup assembly is detachably sleeved onto the other end of the pull rod. The pull rod serves as a forced rigid coaxial constraint reference, ensuring that the two steel cup assemblies are always coaxial. Simultaneously, a main quick-release locking mechanism allows the second steel cup assembly to slide freely along the pull rod or be removed during unlocking (facilitating loading and unloading), and during locking, it fixes the second steel cup assembly relative to the pull rod to transmit pressing force. This structure effectively eliminates axial offset or tilting of the two steel cup assemblies caused by frame deformation, assembly errors, or guide clearance, ensuring consistent concentricity after the upper and lower steel cups are pressed into both ends of the steering tube. This avoids misalignment of the working surfaces of the two steel cups, thereby significantly reducing the resistance of the steel ball operation, preventing localized plastic deformation of the steel cups, and ultimately ensuring smooth steering and extending the service life of the steering wheel.

[0030] 2. The piston rod of the drive element extends downwards, which, together with the top suspension assembly, enables a suspended online layout that does not occupy the ground and facilitates the entry and exit of the vehicle frame. The downward-extending handle and the point control switch installed on it allow the operator to control the pressing action at close range while holding the fixture. The operation is intuitive and responsive, making it easy to fine-tune the alignment at the beginning of the pressing process and avoid damage to the steel cup or pipe opening due to uncontrolled stroke.

[0031] 3. By embedding the first core ring into the inner cavity of the first steel cup and the second core ring into the inner cavity of the second steel cup, the force is evenly distributed on the inner end face of the steel cup during pressing. The flange is fixed to the output end of the drive element by the screw assembly, ensuring the installation stability of the first steel cup assembly. The first and second straight cylinders serve as the connecting and load-bearing bodies, respectively, so that the pressing force can be smoothly transmitted to the core ring, avoiding the steel cup from tilting during pressing, effectively improving the perpendicularity of the pressing end face, thereby ensuring that the steel cups at both ends are accurately matched and have excellent stability when assembled with the pressing head assembly.

[0032] 4. By utilizing the arc-shaped locking block 1 and longitudinal groove 1 on the lower connecting section of the pull rod, and in conjunction with the arc-shaped locking block 2 and longitudinal groove 3 on the inner wall of the straight cylinder 2 of the steel cup assembly 2, a quick-release structure similar to a "buckle-rotary lock" is formed. When unlocking, each locking block and groove 1 are aligned, and the steel cup assembly 2 can be freely slid off. When locking, relative rotation causes the arc-shaped locking block 1 to overlap with the upper end face of the arc-shaped locking block 1. This structure can achieve quick assembly and disassembly without tools, and the overlapping surface can withstand the huge axial pressing force when the pull rod is pulled back. Compared with conventional threaded or pin connections, it has both convenient assembly and disassembly and high load-bearing pull-out resistance, which helps to ensure that the steel cups at both ends are stably and efficiently pressed into the two ends of the faucet pipe, and also greatly improves the efficiency of loading and unloading.

[0033] 5. In the locked state, the spring ball plug automatically engages in the longitudinal groove 2, forming a radial auxiliary positioning structure. This quick-release locking mechanism can prevent the steel cup assembly 2 from rotating circumferentially relative to the pull rod due to vibration or accidental contact during the pressing process, thus preventing accidental unlocking. This effectively improves the safety of the pressing operation and the long-term reliability of the locked state, while not affecting the convenience of quick unlocking operation of the main quick-release locking mechanism.

[0034] 6. By adding a guide tube to the outside of the free end of the core ring, and the outer diameter of the guide tube is smaller than the inner diameter of the steel cup, the guide tube first extends into the inner hole of the steel cup for pre-alignment before the steel cup is officially pressed in. This effectively corrects the slight deviation when the steel cup is fitted into the tie rod, so that the steel cup can smoothly transition to the core ring mounting position. This avoids scratches or bumps on the inner wall of the steel cup or the end of the faucet tube due to direct hard contact with the edge of the core ring, thus improving the surface quality of the finished product.

[0035] 7. Both the lower end of guide cylinder one and the upper end of guide cylinder two are provided with a tapered guide structure that gradually tapers towards the free end, used to guide the centering and insertion of the steel cup and the corresponding core ring. The tapered guide structure (such as a chamfer or conical surface) provided at the free end of the guide cylinder acts as a "funnel" guide when the steel cup is inserted. Even if there is a slight radial misalignment between the steel cup and the core ring, it can be smoothly guided to the correct insertion position by the slope of the conical surface, thereby reducing the centering accuracy requirements for operators when manually inserting the steel cup, preventing deformation of the steel cup due to inaccurate initial positioning, and effectively improving the pressing qualification rate.

[0036] 8. The hydraulic cylinder provides a stable and large pressing force as the driving element; the suspension assembly suspends the fixture on the production line frame through the inclined plate and inclined rod, which saves space and has good rigidity; at least two adjustable limit rings are set on the inclined rod, which can be used to limit the suspension height position of the steel cup assembly or the frame head tube.

[0037] 9. The electrical control components are directly integrated and installed on the side of the drive components via a horizontal plate, and the handle is also fixed to the horizontal plate. This makes the cable path between the point control switch and the electrical control components extremely short, effectively reducing the risk of loose wiring or signal delay. This ensures that the point control switch responds more sensitively to the control of the hydraulic system, while also making the overall structure of the fixture more compact, neat, and easy to maintain.

[0038] 10. A method for using the steel cup assembly fixture based on the above-described motorcycle frame stem tube of the present invention includes the following steps: In step S1, a piston rod is pre-set and extended to provide sufficient operating space for fitting the steel cups and stem tube at both ends; In step S2, a pull rod is used to connect all workpieces in series and lock the second steel cup assembly; In step S3, the drive element retracts (pull rod back) instead of being pushed out for pressing, so that the pull rod bears tensile load, avoiding the risk of instability and bending of the slender rod under pressure, while relying on the rigidity of the pull rod to ensure that the steel cups at both ends are pressed in synchronously; In step S4, the material is quickly unlocked and unloaded; The entire process is simple to operate, has high pressing synchronization, and uses the pull rod's pull-back action to complete the pressing, fundamentally eliminating the skew problem caused by inconsistent thrust direction in traditional split-type press heads, significantly improving the efficiency and consistency of mass production. Attached Figure Description

[0039] Figure 1 This is a perspective view of a steel cup assembly fixture for a motorcycle frame handlebar tube according to the present invention.

[0040] Figure 2 This is an exploded view of a steel cup assembly fixture for a motorcycle frame stem tube according to the present invention.

[0041] Figure 3 It is a partial 3D view of the lower end of the tie rod;

[0042] Figure 4 This is a 3D view of the second component of the steel pressure bowl;

[0043] Figure 5 This is a top view of the second steel cup assembly;

[0044] Figure 6 yes Figure 5 Longitudinal sectional view of the medium-pressure steel cup assembly II along the AA direction;

[0045] Figure 7 This is a bottom view of the second steel pressure bowl assembly;

[0046] Figure 8 This is a diagram showing the usage state of the steel cup assembly fixture for the motorcycle frame handle tube of the present invention when loading the workpiece;

[0047] Figure 9 yes Figure 8 A magnified view of a section at point S1;

[0048] Figure 10 yes Figure 8 A bottom view of the assembly relationship between the tie rod of the middle assembly fixture and the pressure cup assembly 2 (unlocked state);

[0049] Figure 11 yes Figure 10 A longitudinal sectional view along the BB direction of the assembled tie rod and pressure cup assembly 2 (unlocked state);

[0050] Figure 12 This is a diagram showing the usage state of the steel cup assembly fixture for the motorcycle frame handlebar tube when the steel cup is pressed in.

[0051] Figure 13 yes Figure 12 A magnified view of a section at point S2;

[0052] Figure 14 yes Figure 12 A bottom view (locked state) showing the assembly relationship between the tie rod of the middle assembly fixture and the pressure cup assembly 2.

[0053] Figure 15 yes Figure 14 A longitudinal sectional view along the CC direction of the assembled tie rod and pressure cup assembly 2 (locked state);

[0054] Figure 16 yes Figure 14 A longitudinal sectional view along the DD direction of the assembled tie rod and pressure cup assembly 2 (locked state).

[0055] In the diagram: 1. Pull rod; 2. Drive element; 3. Steel cup assembly one; 4. Steel cup assembly two; 5. Handle rod; 6. Point control switch; 7. Electrical control element; 8. Horizontal plate; 9. Suspension assembly; 10. Steel cup one; 11. Faucet pipe; 12. Steel cup two; 1-1. Connecting section; 1-2. Conical guide head structure; 1-3. Arc-shaped locking block one; 1-4. Longitudinal groove one; 1-5. Longitudinal groove two; 3-1. Straight cylinder one; 3-2. Core ring one; 3-3. Guide... 1. Cylinder 1; 3-4. Flange; 4-1. Straight Cylinder 2; 4-2. Core Ring 2; 4-3. Guide Cylinder 2; 4-4. Straight Cylinder 3; 4-5. Arc-shaped Block 2; 4-6. Longitudinal Groove 3; 4-7. Radial Through Hole; 4-8. Center Hole 1; 4-9. Center Hole 2; 4-10. Spring Ball Plug; 5-1. Mounting Groove; 9-1. Inclined Plate; 9-2. Inclined Rod; 9-2a. Limiting End Cap; 9-2b. Threaded Connector; 9-3. Limiting Ring; 9-4. Nut. Detailed Implementation

[0056] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0057] Example 1

[0058] like Figures 1-7 As shown, a jig for assembling a steel cup for a motorcycle frame stem tube includes a pull rod 1, a drive element 2, a first steel cup assembly 3, and a second steel cup assembly 4. The pull rod 1 is adapted to the inner hole of the stem tube 11, the first steel cup assembly 3 is adapted to the first steel cup 10, and the second steel cup assembly 4 is adapted to the second steel cup 12. The first steel cup assembly 3 is fixedly installed at the output end of the drive element 2. One end of the pull rod 1 coaxially passes through the central through hole of the first steel cup assembly 3 and is coaxially fixedly connected to the piston rod end of the drive element 2. The other end of the pull rod 1 is detachably fitted with the second steel cup assembly 4. A main quick-release locking mechanism is provided between the second steel cup assembly 4 and the pull rod 1. The main quick-release locking mechanism is used to selectively lock the second steel cup assembly 4 onto the pull rod 1 or release it to allow the second steel cup assembly 4 to slide along the pull rod 1.

[0059] The main quick-release locking mechanism has two states: unlocked and locked. When it is in the unlocked state, the pressure cup assembly 2 4 can slide along the axial direction of the pull rod 1 or be removed from the pull rod 1. When it is in the locked state, the pressure cup assembly 2 4 is fixed and locked relative to the pull rod 1.

[0060] The method of using a steel cup assembly fixture for a motorcycle frame steering tube in Example 1 includes the following steps:

[0061] S1: Preset the piston rod extension stroke of the drive element 2, and start the drive element 2 to extend its piston rod to the preset stroke;

[0062] S2: Connect the steel bowl 10, the faucet tube 11, and the steel bowl 2 12 to the pull rod 1 in sequence, with the open end of the steel bowl 10 facing the pressing steel bowl assembly 3. Connect the pressing steel bowl assembly 2 4 to the end of the pull rod 1 adjacent to the steel bowl 2 12, with the open end of the steel bowl 2 12 facing the pressing steel bowl assembly 2 4. Then switch the main quick-release locking mechanism from the unlocked state to the locked state.

[0063] S3: Start the drive element 2 to retract its piston rod, and drive the steel cup assembly 2 4 to move towards the side close to the steel cup assembly 3 via the pull rod 1, so that the steel cup 1 10 and the steel cup 2 12 are pressed into the two ends of the faucet tube 11 simultaneously;

[0064] S4: Switch the main quick-release locking mechanism from the locked state to the unlocked state, remove the steel cup assembly 4, and then remove the pressed faucet pipe 11, steel cup 10, and steel cup 2 12 from the pull rod 1 to complete one pressing cycle.

[0065] The present invention discloses a method for using a steel cup assembly fixture based on the aforementioned motorcycle frame stem tube. In step S1, a piston rod is pre-set and extended to provide sufficient operating space for fitting the steel cups at both ends and the stem tube. In step S2, a pull rod is used to connect all workpieces in series and lock the second steel cup assembly. In step S3, the drive element retracts (pull rod back) instead of being pushed out for pressing, so that the pull rod bears tensile load, avoiding the risk of instability and bending of the slender rod under pressure. At the same time, the rigidity of the pull rod ensures that the steel cups at both ends are pressed in synchronously. In step S4, the material is quickly unlocked and unloaded. The entire process is simple to operate, has high pressing synchronization, and uses the pull rod's pull-back action to complete the pressing, fundamentally eliminating the skew problem caused by inconsistent thrust direction in traditional split-type press heads, significantly improving the efficiency and consistency of mass production.

[0066] Example 2

[0067] like Figures 1-7 As shown, a steel cup assembly fixture for a motorcycle frame handlebar differs from the steel cup assembly fixture for a motorcycle frame handlebar in that: the piston rod of the drive element 2 extends downwards, a suspension assembly 9 is fixedly mounted on the top of the drive element 2, and a downwardly extending handle rod 5 is also provided on the drive element 2. A momentary control switch 6 for controlling the movement of the drive element 2 is installed on the handle rod 5. Specifically, a mounting groove 5-1 is provided on the lower outer circumferential surface of the handle rod 5, and the momentary control switch 6 is embedded and fixed inside the mounting groove 5-1 by a screw assembly.

[0068] Preferably, the steel cup assembly 3 includes a straight cylinder 3-1, a core ring 3-2, and a flange 3-4. The straight cylinder 3-1 is vertically fixed to the center of the lower end face of the flange 3-4. The upper end of the core ring 3-2 is coaxially fixedly connected to the lower end of the straight cylinder 3-1. The core ring 3-2 is fitted into the inner cavity of the steel cup 10. The flange 3-4 is fixedly installed to the output end of the drive element 2 by a screw assembly.

[0069] The pressure cup assembly 2 4 includes a straight cylinder 2 4-1 and a core ring 2 4-2. The lower end of the core ring 2 4-2 is coaxially and fixedly connected to the upper end of the straight cylinder 2 4-1. The core ring 2 4-2 is fitted into the inner cavity of the steel cup 2 12. The main quick-release locking mechanism is provided between the straight cylinder 2 4-1 and the lower end of the pull rod 1.

[0070] More preferably, the lower end of the pull rod 1 is milled to form a connecting section 1-1, the outer diameter of the connecting section 1-1 is smaller than the outer diameter of the main body of the pull rod 1, and a plurality of arc-shaped locking blocks 1-3 and a plurality of longitudinal grooves 1-4 are alternately arranged circumferentially on the outer peripheral surface of the middle part of the connecting section 1-1, the outer convex arc surfaces of the plurality of arc-shaped locking blocks 1-3 are located on the same circumference, and the outer diameter of the circumference is smaller than the inner diameter of the steel cup 10 and the steel cup 2 12;

[0071] The inner circumferential surface of the straight cylinder 4-1 is provided with a plurality of arc-shaped locking blocks 4-5 spaced circumferentially. The inner concave arc surfaces of the plurality of arc-shaped locking blocks 4-5 are located on the same circumference. The inner diameter of the circumference is smaller than the outer diameter of the circumference. A longitudinal groove 4-6 is formed between two adjacent arc-shaped locking blocks 4-5. The plurality of arc-shaped locking blocks 4-5, the plurality of arc-shaped locking blocks 1-3, and the plurality of longitudinal grooves 1-4 and 4-6 are correspondingly matched to form a main quick-release locking mechanism.

[0072] When in the unlocked state, several of the arc-shaped locking blocks 4-5 are aligned with several of the longitudinal grooves 1-4, and several of the arc-shaped locking blocks 1-3 are aligned with several of the longitudinal grooves 4-6. The pressure cup assembly 4 can slide freely along the connecting section 1-1. When in the locked state, several of the arc-shaped locking blocks 4-5 slide through several of the longitudinal grooves 1-4 to the upper end of the connecting section 1-1 and rotate relative to each other by a certain angle, so that several of the arc-shaped locking blocks 4-5 overlap one-to-one with the upper end face of several of the arc-shaped locking blocks 1-3 to achieve axial limiting and locking. Specifically, the lower end of the connecting section 1-1 is provided as a tapered guide head structure 1-2, which is used to guide the steel bowl and faucet tube to be centered and sleeved on the pull rod 1; the steel bowl assembly 2 4 is an integrally machined part, the upper end of the straight cylinder 2 4-1, the core ring 2 4-2 and the guide cylinder 2 4-3 have a central hole 1 4-8 inside, the lower end of the straight cylinder 2 4-1 and the straight cylinder 3 4-4 have a central hole 2 4-9 inside, the central hole 1 4-8 and the central hole 2 4-9 are coaxially connected to form the central through hole inside the steel bowl assembly 2 4, and the inner diameter of the central hole 1 4-8 is smaller than the inner diameter of the central hole 2 4-9.

[0073] More preferably, a plurality of longitudinal grooves 1-5 are provided circumferentially on the outer peripheral surface of the upper end of the connecting segment 1-1, and the plurality of longitudinal grooves 1-5 are distributed one-to-one on the upper side of the middle of the plurality of arc-shaped blocks 1-3;

[0074] The straight cylinder 4-1 is provided with a plurality of radial through holes 4-7 spaced circumferentially. Each of the radial through holes 4-7 is correspondingly located in the middle of a plurality of arc-shaped locking blocks 4-5. A spring ball plug 4-10 is installed in each radial through hole 4-7. When the main quick-release locking mechanism is in the locked state, the spring ball of the spring ball plug 4-10 engages with the corresponding longitudinal groove 1-5. The longitudinal grooves 1-5, the radial through holes 4-7, and the spring ball plugs 4-10 together constitute a secondary quick-release locking mechanism for radial auxiliary positioning in the locked state. Specifically, the arc-shaped locking block 1-3, the longitudinal groove 1-4, the arc-shaped locking block 4-5, the longitudinal groove 4-6, the radial through holes 4-7, and the spring ball plugs 4-10 are all arranged in a cross shape in four units. In practical applications, other quantities can be flexibly set according to requirements.

[0075] More preferably, the steel cup assembly 3 further includes a guide cylinder 3-3, the upper end of the guide cylinder 3-3 being coaxially and fixedly connected to the lower end of the core ring 3-2, and the outer diameter of the guide cylinder 3-3 being smaller than the inner diameter of the steel cup 10;

[0076] The steel cup assembly 2 4 further includes a guide cylinder 2 4-3 and a straight cylinder 3 4-4. The lower end of the guide cylinder 2 4-3 is coaxially and fixedly connected to the upper end of the core ring 2 4-2. The outer diameter of the guide cylinder 2 4-3 is smaller than the inner diameter of the steel cup 2 12. The straight cylinder 3 4-4 is milled from the lower end of the straight cylinder 2 4-1, and the outer diameter of the straight cylinder 3 4-4 is smaller than the outer diameter of the straight cylinder 2 4-1. Milling the lower end of the straight cylinder 2 4-1 into a straight cylinder 3 4-4 with a narrower outer diameter helps to improve the grip of the steel cup assembly 2 4, and also helps to reduce the overall weight of the steel cup assembly 2 4, improving its ease of use.

[0077] More preferably, the lower end of the guide cylinder 3-3 and the upper end of the guide cylinder 4-3 are both provided with a tapered guide structure that gradually tapers towards the free end, which is used to guide the centering and embedding of the steel cup with the corresponding core ring.

[0078] More preferably, the driving element 2 is a hydraulic cylinder, which is externally connected to a hydraulic system. The suspension assembly 9 includes a sloping plate 9-1, a sloping rod 9-2, and a limiting ring 9-3. The sloping plate 9-1 is fixedly installed on the top of the hydraulic cylinder and extends outward and upward. The high end of the sloping rod 9-2 is fixedly installed on the sloping plate 9-1, and the low end of the sloping rod 9-2 is fixedly installed with a limiting end cap 9-2a. At least two adjustable limiting rings 9-3 are sleeved on the sloping rod 9-2. Specifically, the high end of the sloping rod 9-2 is provided with a threaded connector 9-2b, the outer diameter of which is smaller than the outer diameter of the main body of the sloping rod 9-2. The sloping plate 9-1 has a through-hole for mounting. The threaded connector 9-2b passes through the mounting hole on the sloping plate 9-1 and is fixedly locked to the sloping plate 9-1 by a nut 9-4 screwed to the end of the threaded connector 9-2b.

[0079] More preferably, a horizontal plate 8 is fixedly mounted on one side of the drive element 2, the upper end of the handle rod 5 is fixedly mounted on the horizontal plate 8, an electrical control element 7 is mounted on the upper surface of the horizontal plate 8, and the point control switch 6 is electrically connected to the hydraulic system through the electrical control element 7. Specifically, the suspension assembly 9 is located above the horizontal plate 8.

[0080] The method of using a steel cup assembly fixture for a motorcycle frame steering tube in Example 2 includes the following steps:

[0081] T1: Preset piston rod extension stroke of drive element 2, start drive element 2 to extend its piston rod to the preset stroke;

[0082] T2: Connect steel bowl 10, faucet pipe 11, and steel bowl 2 12 sequentially from bottom to top onto pull rod 1, ensuring the open end of steel bowl 10 is adjacent to the upward-facing pressing steel bowl assembly 3. Connect pressing steel bowl assembly 2 4 to the lower end of pull rod 1, adjacent to the area below steel bowl 2 12, with the open end of steel bowl 2 12 facing downwards towards pressing steel bowl assembly 2 4 (see appendix). Figures 8-11 At this point, the main quick-release locking mechanism is in the unlocked state (i.e., several arc-shaped locking blocks 4-5 are aligned with several longitudinal grooves 1-4, several arc-shaped locking blocks 1-3 are aligned with several longitudinal grooves 4-6, and the spring balls of each spring plug 4-10 abut against the upper outer circumferential surface of the connecting section 1-1). Then, the pressure cup assembly 4 is rotated relative to the connecting section 1-1 by a certain angle, so that the main quick-release locking mechanism switches from the unlocked state to the locked state (i.e., several arc-shaped locking blocks 4-5 are correspondingly overlapped on the upper end surfaces of several arc-shaped locking blocks 1-3, and the spring balls of each spring plug 4-10 are inserted into the corresponding longitudinal grooves 1-5 to achieve axial limiting locking, see Appendix). Figures 14-16 );

[0083] T3: Activate drive element 2 to retract its piston rod, which drives the steel cup assembly 2 4 upward via pull rod 1 and gradually approaches the steel cup assembly 1 3, simultaneously pressing the steel cup 1 10 and steel cup 2 12 into the upper and lower ends of the faucet tube 11 (see appendix). Figures 12-13 );

[0084] T4: Rotate the steel cup assembly 2 4 relative to the connecting section 1-1 by a certain angle to switch the main quick-release locking mechanism from the locked state to the unlocked state, remove the steel cup assembly 2 4, and then remove the faucet pipe 11, steel cup 1 10, and steel cup 2 12 that have been pressed together from the pull rod 1 to complete one pressing cycle.

[0085] This invention designs a jig for assembling steel cups for a motorcycle frame steering tube. A pull rod is installed through the inner hole of the steering tube, and a second steel cup assembly is coaxially fixed to the output end of the drive element. The third steel cup assembly is detachably sleeved onto the other end of the pull rod. The pull rod serves as a forced, rigid, coaxial constraint reference, ensuring that the two steel cup assemblies are always coaxial. Simultaneously, a main quick-release locking mechanism allows the second steel cup assembly to slide freely along the pull rod or be removed during unlocking (facilitating loading and unloading). During locking, the second steel cup assembly is fixed and locked relative to the pull rod to transmit the pressing force. This structure effectively eliminates axial offset or tilting of the two steel cup assemblies caused by frame deformation, assembly errors, or guide clearances, ensuring consistent concentricity after the upper and lower steel cups are pressed into both ends of the steering tube. This avoids misalignment of the working surfaces of the two steel cups, significantly reducing the resistance of the steel ball operation, preventing localized plastic deformation of the steel cups, and ultimately ensuring smooth steering and extending the service life of the steering wheel.

[0086] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A steel cup assembly jig for a motorcycle frame handlebar, characterized in that, The device includes a pull rod (1), a drive element (2), a steel cup assembly one (3), and a steel cup assembly two (4). The pull rod (1) is adapted to the inner hole of the faucet tube (11). The steel cup assembly one (3) is adapted to the steel cup one (10). The steel cup assembly two (4) is adapted to the steel cup two (12). The steel cup assembly one (3) is fixedly installed at the output end of the drive element (2). One end of the pull rod (1) coaxially passes through the steel cup assembly one (3). The center through hole of the pull rod (1) is coaxially fixedly connected to the piston rod end of the drive element (2). The other end of the pull rod (1) is detachably sleeved with a pressure steel cup assembly two (4). A main quick-release locking mechanism is provided between the pressure steel cup assembly two (4) and the pull rod (1). The main quick-release locking mechanism is used to selectively lock the pressure steel cup assembly two (4) on the pull rod (1) or release the lock so that the pressure steel cup assembly two (4) can slide along the pull rod (1). The main quick-release locking mechanism has two states: unlocked and locked. When it is in the unlocked state, the pressure cup assembly 2 (4) can slide along the axial direction of the pull rod (1) or be removed from the pull rod (1). When it is in the locked state, the pressure cup assembly 2 (4) is fixed and locked relative to the pull rod (1).

2. The steel cup assembly fixture for the motorcycle frame stem tube as described in claim 1, characterized in that, The piston rod of the drive element (2) extends downward, and a suspension assembly (9) is fixed on the top of the drive element (2). The drive element (2) is also provided with a handle rod (5) extending downward, and a point control switch (6) for controlling the action of the drive element (2) is installed on the handle rod (5).

3. The steel cup assembly fixture for the motorcycle frame steering tube as described in claim 2, characterized in that, The pressure cup assembly (3) includes a straight cylinder (3-1), a core ring (3-2), and a flange (3-4). The straight cylinder (3-1) is vertically fixed at the center of the lower end face of the flange (3-4). The upper end of the core ring (3-2) is coaxially fixedly connected to the lower end of the straight cylinder (3-1). The core ring (3-2) is fitted into the inner cavity of the pressure cup (10). The flange (3-4) is fixedly installed at the output end of the drive element (2) by a screw assembly. The pressure cup assembly 2 (4) includes a straight cylinder 2 (4-1) and a core ring 2 (4-2). The lower end of the core ring 2 (4-2) is coaxially and fixedly connected to the upper end of the straight cylinder 2 (4-1). The core ring 2 (4-2) is fitted into the inner cavity of the steel cup 2 (12). The main quick-release locking mechanism is provided between the lower end of the straight cylinder 2 (4-1) and the pull rod (1).

4. The steel cup assembly fixture for the motorcycle frame stem tube as described in claim 3, characterized in that, The lower end of the pull rod (1) is milled to form a connecting section (1-1). The outer diameter of the connecting section (1-1) is smaller than the outer diameter of the main body of the pull rod (1). Several arc-shaped locking blocks (1-3) and several longitudinal grooves (1-4) are alternately arranged on the outer circumferential surface of the middle part of the connecting section (1-1). The outer convex arc surfaces of several arc-shaped locking blocks (1-3) are located on the same circumference. The outer diameter of the circumference is smaller than the inner diameter of the steel cup (10) and the steel cup (12). The inner circumferential surface of the straight cylinder 2 (4-1) is provided with a plurality of arc-shaped locking blocks 2 (4-5) spaced circumferentially. The inner concave arc surfaces of the plurality of arc-shaped locking blocks 2 (4-5) are located on the same circumference. The inner diameter of the circumference is smaller than the outer diameter of the circumference. A longitudinal groove 3 (4-6) is formed between two adjacent arc-shaped locking blocks 2 (4-5). The plurality of arc-shaped locking blocks 2 (4-5), the plurality of arc-shaped locking blocks 1 (1-3), and the plurality of longitudinal grooves 1 (1-4) and longitudinal grooves 3 (4-6) are correspondingly matched to form the main quick-release locking mechanism. When in the unlocked state, several of the arc-shaped locking blocks 2 (4-5) are aligned with several of the longitudinal grooves 1 (1-4), and several of the arc-shaped locking blocks 1 (1-3) are aligned with several of the longitudinal grooves 3 (4-6). The pressure steel bowl assembly 2 (4) can slide freely along the connecting section (1-1). When in the locked state, several of the arc-shaped locking blocks 2 (4-5) slide through several of the longitudinal grooves 1 (1-4) to the upper end of the connecting section (1-1) and rotate relative to each other by a certain angle, so that several of the arc-shaped locking blocks 2 (4-5) overlap one-to-one with the upper end face of several of the arc-shaped locking blocks 1 (1-3) to achieve axial limiting and locking.

5. The steel cup assembly fixture for the motorcycle frame stem tube as described in claim 4, characterized in that, The outer circumferential surface of the upper end of the connecting segment (1-1) is provided with a plurality of longitudinal grooves (1-5) spaced apart in a circumferential manner, and the plurality of longitudinal grooves (1-5) are distributed one-to-one on the upper side of the middle of the plurality of arc-shaped blocks (1-3); The straight cylinder 2 (4-1) is provided with a plurality of radial through holes (4-7) spaced circumferentially. The plurality of radial through holes (4-7) are opened one-to-one in the middle of the plurality of arc-shaped locking blocks 2 (4-5). Each radial through hole (4-7) is equipped with a spring ball plug (4-10). When the main quick-release locking mechanism is in the locked state, the ball of the spring ball plug (4-10) is inserted into the corresponding longitudinal groove 2 (1-5). The plurality of longitudinal groove 2 (1-5), the plurality of radial through holes (4-7) and the spring ball plug (4-10) together constitute the secondary quick-release locking mechanism, which is used for radial auxiliary positioning in the locked state.

6. The steel cup assembly fixture for the motorcycle frame stem tube as described in claim 3, characterized in that, The steel cup assembly (3) further includes a guide cylinder (3-3), the upper end of which is coaxially and fixedly connected to the lower end of the core ring (3-2), and the outer diameter of the guide cylinder (3-3) is smaller than the inner diameter of the steel cup (10). The steel cup assembly 2 (4) further includes a guide cylinder 2 (4-3) and a straight cylinder 3 (4-4). The lower end of the guide cylinder 2 (4-3) is coaxially and fixedly connected to the upper end of the core ring 2 (4-2). The outer diameter of the guide cylinder 2 (4-3) is smaller than the inner diameter of the steel cup 2 (12). The straight cylinder 3 (4-4) is milled from the lower end of the straight cylinder 2 (4-1), and the outer diameter of the straight cylinder 3 (4-4) is smaller than the outer diameter of the straight cylinder 2 (4-1).

7. The steel cup assembly fixture for the motorcycle frame stem tube as described in claim 6, characterized in that, The lower end of the first guide cylinder (3-3) and the upper end of the second guide cylinder (4-3) are both provided with a tapered guide structure that gradually tapers towards the free end, which is used to guide the steel cup and the corresponding core ring to be aligned and fitted.

8. The steel cup assembly fixture for the motorcycle frame steering tube as described in claim 2, characterized in that, The driving element (2) is a hydraulic cylinder, which is connected to an external hydraulic system. The suspension assembly (9) includes a ramp (9-1), a ramp (9-2), and a limiting ring (9-3). The ramp (9-1) is fixedly installed on the top of the hydraulic cylinder and extends outward and upward. The high end of the ramp (9-2) is fixedly installed on the ramp (9-1). The low end of the ramp (9-2) is fixedly installed with a limiting end cap (9-2a). At least two adjustable limiting rings (9-3) are sleeved on the ramp (9-2).

9. The steel cup assembly fixture for the motorcycle frame stem tube as described in claim 8, characterized in that, A horizontal plate (8) is fixedly installed on one side of the drive element (2), and the upper end of the handle rod (5) is fixedly installed on the horizontal plate (8). An electrical control element (7) is installed on the upper surface of the horizontal plate (8), and the point control switch (6) is electrically connected to the hydraulic system through the electrical control element (7).

10. A method of using a steel cup assembly fixture for a motorcycle frame stem tube according to any one of claims 1 to 9, characterized in that, The following steps are included: S1: Preset the piston rod extension stroke of the drive element (2), start the drive element (2) to extend its piston rod to the preset stroke; S2: Connect the steel bowl one (10), the faucet pipe (11) and the steel bowl two (12) to the pull rod (1) in sequence, and make the open end of the steel bowl one (10) face the pressure steel bowl assembly one (3). Connect the pressure steel bowl assembly two (4) to the end of the pull rod (1) that is adjacent to the steel bowl two (12), and make the open end of the steel bowl two (12) face the pressure steel bowl assembly two (4). Then switch the main quick-release locking mechanism from the unlocked state to the locked state. S3: Start the drive element (2) to retract its piston rod, and drive the steel cup assembly 2 (4) to move closer to the steel cup assembly 1 (3) through the pull rod (1), so that the steel cup 1 (10) and steel cup 2 (12) are pressed into the two ends of the faucet tube (11) simultaneously; S4: Switch the main quick-release locking mechanism from the locked state to the unlocked state, remove the steel cup assembly 2 (4), and then remove the faucet pipe (11), steel cup 1 (10), and steel cup 2 (12) that have been pressed and installed from the pull rod (1) to complete one pressing cycle.

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