A hydraulic expansion sleeve coupling installation accuracy testing device

Abstract

This disclosure relates to the field of coupling testing technology, and provides a testing device for the installation accuracy of a hydraulic expansion sleeve coupling, including a mounting base plate, a mounting vertical plate, and a testing motor. The output shaft of the testing motor extends out of the mounting vertical plate and serves as a simulated installation shaft for the hydraulic expansion sleeve coupling. A hydraulic expansion sleeve is fitted onto the output shaft, and a transmission component is fitted onto one end of the hydraulic expansion sleeve. A testing instrument is provided on one side of the mounting vertical plate. The testing instrument is used to detect the radial offset relative to the centerline of the output shaft during the rotation of the transmission component. The radial offset is used to characterize the installation accuracy of the hydraulic expansion sleeve connection interface. By constructing a transmission link consistent with actual power transmission conditions, the device can quantitatively detect the cumulative assembly error generated during the installation of the hydraulic expansion sleeve, which can truly reflect the installation quality and rotational accuracy of the hydraulic expansion sleeve coupling under actual transmission conditions, providing a reliable basis for product design optimization, assembly process evaluation, and quality inspection.

Description

Technical Field

[0001] This disclosure relates to the field of coupling testing technology, and more specifically, to a device for testing the installation accuracy of a hydraulic expansion coupling. Background Technology

[0002] Hydraulic expansion couplings are high-precision connection devices that utilize the principle of hydraulic expansion to achieve a keyless connection between a shaft and a hub. They generate pressure through an internal hydraulic medium driven by a locking screw. Especially in the field of new energy vehicles, the high speed and fast response of the drive motor place extremely high demands on the coaxiality and balance of the transmission system. Insufficient installation precision of the coupling can easily lead to increased vibration, increased noise, abnormal bearing wear, and decreased energy transmission efficiency in the transmission system, thereby affecting the overall vehicle's operating performance and service life.

[0003] In existing technologies, to verify the installation quality of hydraulic expansion couplings, dial indicators, displacement sensors, and other testing devices are typically used to detect the radial runout of the installed coupling or hub, or specialized testing fixtures are used to measure the coaxiality error after installation. While these testing methods can obtain geometric accuracy data of the coupling after installation, the testing objects are usually the coupling body or hub components in a static installation state, and can only reflect installation deviations in local positions.

[0004] However, in actual power transmission, the hydraulic expansion sleeve forms a keyless connection with both the drive shaft and the driven component. The rotational accuracy of the drive shaft needs to be transmitted to the driven component via the hydraulic expansion sleeve. Minor deviations generated during the installation of the hydraulic expansion sleeve are transmitted and accumulated along the power transmission path, affecting the actual rotational accuracy at the end of the transmission chain. Therefore, static testing or runout testing of a single component alone is insufficient to accurately reflect the cumulative assembly error generated at the hydraulic expansion sleeve connection interface under actual power transmission conditions, and it is also difficult to accurately evaluate the overall coaxiality accuracy of the transmission chain formed after the hydraulic expansion sleeve coupling is installed.

[0005] Therefore, how to provide a hydraulic expansion sleeve coupling installation accuracy testing device to simulate the actual power transmission conditions of the hydraulic expansion sleeve coupling, construct an accuracy transmission path consistent with actual applications, and quantitatively detect the assembly cumulative error generated at the hydraulic expansion sleeve connection interface has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this disclosure is to provide a hydraulic expansion sleeve coupling installation accuracy testing device, which solves the problems mentioned in the background art.

[0007] This disclosure provides a hydraulic expansion sleeve coupling installation accuracy testing device, including a mounting base plate and a mounting vertical plate that are perpendicularly connected to each other. The mounting base plate is arranged in a horizontal state, and a test motor is vertically mounted on the mounting vertical plate. The test motor is spaced apart from the mounting base plate. The output shaft of the test motor extends out of the mounting vertical plate and serves as a simulated mounting shaft for the hydraulic expansion sleeve coupling. A hydraulic expansion sleeve is fitted onto the output shaft, and a transmission component is fitted onto the end of the hydraulic expansion sleeve away from the mounting vertical plate. The hydraulic expansion sleeve forms a keyless fixed connection with the output shaft and the transmission component respectively through its own expansion action. The test motor is used to drive the output shaft to rotate, and the transmission component is driven to rotate synchronously via the hydraulic expansion sleeve; a tester is provided on the side of the mounting plate away from the test motor, and the tester is used to detect the radial offset of the transmission component relative to the axis of the output shaft during rotation, and the radial offset is used to characterize the installation accuracy of the hydraulic expansion sleeve connection interface.

[0008] Optionally, the hydraulic tightening sleeve includes a coupling inner sleeve and a coupling outer sleeve nested together. The coupling inner sleeve is sleeved on the outer wall of the output shaft, and the transmission component is sleeved on the outer wall of the coupling outer sleeve. A hydraulic cavity for filling with hydraulic medium is formed between the coupling outer sleeve and the coupling inner sleeve. The coupling sleeve is provided with a plunger and a tightening screw. The tightening screw is threaded into the coupling sleeve and press-fitted into the plunger to seal the hydraulic chamber.

[0009] Optionally, the outer wall of the inner sleeve of the coupling is provided with a first groove, and the inner wall of the outer sleeve of the coupling is provided with a second groove; The coupling sleeve has a connecting cavity and a sealing cavity, and the first groove, the second groove, the connecting cavity and the sealing cavity together form the hydraulic cavity.

[0010] Optionally, the inner diameter of the sealing cavity is larger than the inner diameter of the communicating cavity, and the axis of the sealing cavity is set at an angle to the axis of the communicating cavity.

[0011] Optionally, a first mounting interface is formed between the inner sleeve of the coupling and the output shaft, and a second mounting interface is formed between the outer sleeve of the coupling and the transmission component; The radial offset detected by the tester is used to characterize the overall installation accuracy of the first installation interface and the second installation interface.

[0012] Optionally, the plunger component includes a plunger body, with a pressure ball surface at one end of the plunger body near the tightening screw, and a pressure ring and a sealing ring sequentially fitted onto the other end of the plunger body away from the tightening screw.

[0013] Optionally, the coupling sleeve is provided with a fluid injection chamber that communicates with the hydraulic chamber, and the fluid injection chamber is provided with an anti-theft screw and a sealing ball; The injection chamber is provided with a sealing ball surface that abuts against the sealing ball, and the anti-theft screw is threadedly connected to the coupling sleeve and abuts against the sealing ball.

[0014] Optionally, the anti-theft screw has an opening groove at the end away from the sealing ball, and an anti-theft post is provided in the opening groove.

[0015] Optionally, the mounting base is provided with a magnetic seat, and the magnetic seat is provided with an adjustment bracket, which is used to install the tester and adjust the current position of the tester.

[0016] Optionally, the testing instrument is any one of dial indicator, micrometer, laser displacement sensor, eddy current displacement sensor, contact displacement sensor, roundness meter, rotational accuracy measuring instrument, and visual inspection device.

[0017] As can be seen from the above technical solution, the hydraulic expansion sleeve coupling installation accuracy testing device in the exemplary embodiment of this disclosure has at least the following advantages and positive effects: This disclosure provides a hydraulic expansion sleeve coupling installation accuracy testing device. It constructs a power transmission link consistent with the actual application of the hydraulic expansion sleeve coupling by testing the motor, hydraulic expansion sleeve, and transmission components. The device uses a testing instrument to detect the radial offset of the transmission component relative to the output shaft centerline during rotation. Since the hydraulic expansion sleeve forms a keyless fixed connection with both the output shaft and the transmission component, interface deviations generated during installation will be transmitted step-by-step and accumulate at the end of the transmission component as the power is transmitted. This disclosure quantifies the cumulative assembly error of the hydraulic expansion sleeve connection interface by detecting the dynamic rotational accuracy of the transmission component. Compared to existing static testing methods targeting individual components, this disclosure not only reflects local installation deviations but also accurately characterizes the overall installation quality and accuracy transmission capability of the hydraulic expansion sleeve coupling under actual working conditions, thereby improving the authenticity of the test results and their engineering guidance value.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 A three-dimensional structural schematic diagram of a hydraulic expansion sleeve coupling installation accuracy testing device according to an embodiment of the present disclosure is shown; Figure 2 A cross-sectional structural schematic diagram of another hydraulic expansion sleeve coupling installation accuracy testing device according to an embodiment of the present disclosure is shown; Figure 3 A three-dimensional structural schematic diagram of the hydraulic expansion sleeve in a hydraulic expansion sleeve coupling installation accuracy testing device according to an embodiment of the present disclosure is shown; Figure 4 A cross-sectional structural schematic diagram of the hydraulic expansion sleeve in a hydraulic expansion sleeve coupling installation accuracy testing device according to an embodiment of the present disclosure is shown; Figure 5 This illustration shows a schematic diagram of the inner and outer sleeves of a hydraulic expansion coupling installation accuracy testing device according to an embodiment of the present disclosure. Figure 6 This diagram illustrates the structure of the anti-theft screw and sealing ball in a hydraulic expansion coupling installation accuracy testing device according to an embodiment of the present disclosure; Figure 7 This diagram illustrates the structure of the plunger and expansion screw in a hydraulic expansion coupling installation accuracy testing device according to an embodiment of the present disclosure. Figure 8 A three-dimensional structural schematic diagram of another hydraulic expansion sleeve coupling installation accuracy testing device according to an embodiment of the present disclosure is shown.

[0020] Illustration: 110. Install base plate; 120. Install vertical plate; 200. Test motor; 210. Output shaft; 300. Hydraulic expansion sleeve; 310. Coupling inner sleeve; 311. First groove; 320. Coupling outer sleeve; 321. Second groove; 322. Connecting cavity; 323. Sealing cavity; 324. Injection cavity; 325. Sealing spherical surface; 330. Plunger component; 331. Plunger body; 3311. Pressing spherical surface; 3312. Sealing groove; 332. Pressing ring; 333. Sealing ring; 340. Expansion screw; 350. Anti-theft screw; 351. Opening groove; 352. Anti-theft post; 360. Sealing ball; 400. Transmission component; 500. Magnetic base; 510. Adjustment bracket. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art.

[0022] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0023] Please see Figures 1 to 8 This disclosure provides a hydraulic expansion sleeve coupling installation accuracy testing device. The testing device includes a mounting base plate 110 and a mounting vertical plate 120. The mounting base plate 110 is arranged in a horizontal state, and the mounting vertical plate 120 is fixedly connected to the mounting base plate 110. The mounting vertical plate 120 and the mounting base plate 110 are arranged perpendicular to each other, thereby forming a stable installation support structure.

[0024] A test motor 200 is mounted on the mounting vertical plate 120. The test motor 200 is located above the mounting base plate 110 and spaced apart from the mounting base plate 110. The output shaft 210 of the test motor 200 passes through the mounting vertical plate 120 horizontally and extends out of the mounting vertical plate 120. The output shaft 210 is used to simulate the drive shaft in the actual application of the hydraulic expansion sleeve coupling. The output shaft 210 can be used as a simulated mounting shaft of the hydraulic expansion sleeve coupling.

[0025] A hydraulic expansion sleeve 300 is fitted onto the outer wall of the output shaft 210, forming a keyless fixed connection between the hydraulic expansion sleeve 300 and the output shaft 210 through hydraulic expansion. A transmission component 400 is fitted onto the end of the hydraulic expansion sleeve 300 away from the mounting vertical plate 120, forming a keyless fixed connection between the hydraulic expansion sleeve 300 and the transmission component 400. In the drive system of new energy vehicles, the transmission component 400 can be a reducer input flange, a synchronous pulley, or a hub connector; this embodiment does not limit this. By testing the dynamic rotational accuracy of the transmission component 400, the impact of the hydraulic expansion sleeve coupling on the vibration performance and transmission stability of the drive system after installation can be evaluated.

[0026] A testing instrument is installed on the side of the mounting plate 120 away from the test motor 200. The testing end of the testing instrument is positioned facing the transmission component 400 and is used to detect the radial displacement change of the outer circular surface of the transmission component 400 or a preset testing position. The testing instrument can employ a dial indicator, micrometer, laser displacement sensor, eddy current displacement sensor, or other detection devices.

[0027] The testing process in this embodiment is as follows: First, the hydraulic expansion sleeve 300 is installed between the output shaft 210 and the transmission component 400, and the hydraulic expansion sleeve 300 is tightened and fixed according to the preset installation process, so that the hydraulic expansion sleeve 300 forms a keyless connection with the output shaft 210 and the transmission component 400 respectively.

[0028] The test motor 200 is then started, driving the output shaft 210 to rotate. Since the hydraulic expansion sleeve 300 is fixedly connected to both the output shaft 210 and the transmission component 400, the rotational motion of the output shaft 210 is transmitted to the transmission component 400 via the hydraulic expansion sleeve 300, thereby causing the transmission component 400 to rotate synchronously.

[0029] During the rotation of the transmission component 400, the tester detects the radial offset of the transmission component 400 relative to the axis of the output shaft 210 in real time, and records the radial displacement change data of the transmission component 400 in one or more rotation cycles.

[0030] Since the hydraulic expansion sleeve 300 forms installation interfaces with both the output shaft 210 and the transmission component 400, eccentricity errors, tilting errors, and local assembly errors generated during installation will be transmitted step-by-step to the transmission component 400 through the power transmission path. Therefore, the radial offset detected by the testing instrument not only reflects the installation deviation at a single location but also reflects the cumulative assembly error formed by the hydraulic expansion sleeve 300 under actual power transmission conditions. By analyzing the radial offset, the installation accuracy and power transmission accuracy of the hydraulic expansion sleeve 300 can be evaluated.

[0031] In one embodiment of this disclosure, the test motor 200 drives the output shaft 210 to rotate continuously.

[0032] Compared to static testing, dynamic testing subjects the hydraulic expansion sleeve 300 to centrifugal force, contact stress, and transmission loads similar to actual operating conditions. Some installation errors are difficult to detect in a static state but will manifest as periodic radial displacement changes during continuous rotation. Therefore, dynamic testing can amplify the impact of installation errors on rotational accuracy and improve testing sensitivity. Simultaneously, the data obtained from dynamic testing can more accurately reflect the transmission performance of the hydraulic expansion sleeve coupling under actual operating conditions, thereby improving the consistency between the installation accuracy evaluation results and actual operating conditions.

[0033] In one embodiment of this disclosure, please refer to Figures 3 to 5 Based on the above embodiments, this embodiment further describes the specific structure of the hydraulic expansion sleeve 300.

[0034] In this embodiment, the hydraulic expansion sleeve 300 includes a coupling inner sleeve 310 and a coupling outer sleeve 320 nested together. The coupling inner sleeve 310 is fitted onto the outer wall of the output shaft 210, and the coupling outer sleeve 320 is fitted onto the outer side of the coupling inner sleeve 310. The coupling inner sleeve 310 and the coupling outer sleeve 320 are welded and fixed together. The transmission component 400 is fitted onto the outer wall of the coupling outer sleeve 320.

[0035] The inner sleeve 310 of the coupling forms a first mounting interface with the output shaft 210, and the outer sleeve 320 of the coupling forms a second mounting interface with the transmission component 400. The hydraulic expansion sleeve 300 acts on both the first and second mounting interfaces simultaneously through hydraulic expansion, thereby forming a stable keyless fixed connection between the output shaft 210, the hydraulic expansion sleeve 300, and the transmission component 400.

[0036] Ideally, the centerlines of the output shaft 210, the hydraulic expansion sleeve 300, and the transmission component 400 are perfectly aligned. When the test motor 200 drives the output shaft 210 to rotate, the transmission component 400 rotates stably around the centerline of the output shaft 210, at which point the radial offset detected by the tester is close to zero. However, in actual installation, due to machining errors, assembly errors, or differences in force during the hydraulic expansion process, the first and second installation interfaces may experience eccentricity errors, tilting errors, or local positional errors.

[0037] When there is an eccentricity error at the first mounting interface, the rotation center of the hydraulic tightening sleeve 300 will shift relative to the theoretical axis of the output shaft 210; when there is an eccentricity error at the second mounting interface, the rotation center of the transmission component 400 will shift relative to the theoretical axis of the hydraulic tightening sleeve 300. During power transmission, the above deviations will be transmitted step by step along the power transmission path of output shaft 210 → hydraulic tightening sleeve 300 → transmission component 400, and will manifest as a deviation of the rotation trajectory from the theoretical circumferential trajectory at the transmission component 400. Therefore, the radial offset generated during the rotation of the transmission component 400 actually includes the combined error effects formed by the first and second mounting interfaces.

[0038] Furthermore, when the installation error increases, the radial offset generated during the rotation of the transmission component 400 increases synchronously; when the installation error decreases, the radial offset decreases synchronously. Therefore, the radial offset is correlated with the installation accuracy of the hydraulic tightening sleeve 300. This disclosure indirectly quantifies the installation error of the hydraulic tightening sleeve 300 by detecting the radial offset during the rotation of the transmission component 400, thereby establishing a correlation between installation accuracy and dynamic rotation accuracy.

[0039] Compared to existing methods that directly measure the local runout of the coupling, this disclosure uses the end rotation accuracy after power transmission to evaluate the installation quality, which better reflects the overall accuracy level of the hydraulic expansion coupling under actual working conditions.

[0040] Specifically, a hydraulic cavity for containing hydraulic medium is formed between the inner sleeve 310 and the outer sleeve 320 of the coupling. The outer sleeve 320 of the coupling is provided with a plunger 330 and a tightening screw 340. The tightening screw 340 is threadedly connected to the outer sleeve 320 of the coupling, and the tightening screw 340 is press-fitted with the plunger 330.

[0041] During installation, the hydraulic chamber is pre-filled with hydraulic medium. When the expansion screw 340 is tightened, it pushes the plunger 330 towards the hydraulic chamber, thereby applying pressure to the hydraulic medium. The pressurized hydraulic medium transmits pressure to various areas within the hydraulic chamber, causing the inner coupling sleeve 310 to radially contract and the outer coupling sleeve 320 to radially expand, forming an interference fit with the output shaft 210 and the transmission component 400 respectively, thus achieving a keyless connection.

[0042] Furthermore, the outer wall of the inner sleeve 310 of the coupling is provided with a first groove 311, the inner wall of the outer sleeve 320 of the coupling is provided with a second groove 321, and the inner cavity of the outer sleeve 320 of the coupling is also formed with a connecting cavity 322 and a sealing cavity 323. The first groove 311, the second groove 321, the connecting cavity 322 and the sealing cavity 323 together form a hydraulic cavity.

[0043] By providing a first groove 311 and a second groove 321 on the inner sleeve 310 and the outer sleeve 320 of the coupling respectively, the capacity for hydraulic medium can be increased, and the hydraulic pressure can be more evenly distributed between the inner sleeve 310 and the outer sleeve 320 along the circumference, thereby improving the uniformity of the tension force distribution and reducing local stress concentration.

[0044] In this embodiment, the inner diameter of the sealing cavity 323 is larger than the inner diameter of the connecting cavity 322, and the axis of the sealing cavity 323 is set at an angle to the axis of the connecting cavity 322. By adopting this structure, a larger installation space and sealing space can be provided for the plunger component 330, and the sealing effect of the hydraulic medium can be improved, reducing the risk of hydraulic medium leakage.

[0045] In this embodiment, the radial offset of the transmission component 400 detected by the tester is used to characterize the overall installation accuracy of the first and second mounting interfaces. Since the hydraulic expansion sleeve 300 participates in the power transmission between the output shaft 210 and the transmission component 400, any installation deviation occurring at either the first or second mounting interface will be transmitted to the transmission component 400 through the hydraulic expansion sleeve 300. The radial offset detected during the test actually reflects the cumulative assembly error formed by the combined action of the two mounting interfaces, thus enabling a more realistic evaluation of the installation quality and accuracy transmission capability of the hydraulic expansion sleeve 300.

[0046] It should be noted that the specific structural forms of the inner sleeve 310 and the outer sleeve 320 of the coupling, the specific arrangement of the hydraulic chamber, and the type of hydraulic medium can all be adjusted according to actual application requirements. As long as the hydraulic tightening effect can be achieved and a keyless connection can be formed, they should all fall within the protection scope of this disclosure.

[0047] In one embodiment of this disclosure, the tester continuously acquires radial displacement data of the transmission component 400 over one or more rotational cycles. The maximum acquired radial displacement value is set to R. max The minimum radial displacement value is R min Then the radial offset ΔR can be expressed as: ΔR = R max -R min The radial offset ΔR is used to characterize the dynamic rotational error that occurs after the hydraulic expansion sleeve 300 is installed.

[0048] In some implementations, the radial offset ΔR can be compared with a preset accuracy threshold. When ΔR is less than the first threshold, the installation accuracy is deemed acceptable; when ΔR is greater than the first threshold, the installation accuracy is deemed unacceptable; or the installation can be classified into high accuracy, medium accuracy, and low accuracy levels based on the magnitude of ΔR.

[0049] By using the above methods, the test results can be transformed into quantifiable installation accuracy evaluation indicators, thereby improving the comparability of the test results and their engineering application value.

[0050] In one embodiment of this disclosure, the accumulation mechanism of installation error of hydraulic expansion coupling during power transmission is explained.

[0051] After the hydraulic expansion sleeve coupling is installed, the output shaft 210, the hydraulic expansion sleeve 300, and the transmission component 400 together form a power transmission chain. Ideally, the theoretical centerlines of the output shaft 210, the hydraulic expansion sleeve 300, and the transmission component 400 are completely coincident. When the output shaft 210 rotates, the transmission component 400 rotates around the same center of rotation.

[0052] However, in the actual assembly process, machining tolerances, geometric tolerances, and assembly errors inevitably exist between the first and second mounting interfaces.

[0053] For example, if the first mounting interface generates a radial eccentricity error E1, and the second mounting interface generates a radial eccentricity error E2, then the actual rotation center of the hydraulic tightening sleeve 300 will shift relative to the theoretical axis of the output shaft 210, and the actual rotation center of the transmission component 400 will further shift. During power transmission, E1 and E2 are not independent of each other, but act together on the transmission component 400 along the power transmission direction.

[0054] Total slewing error ≈ E1 + E2 + E c ; Where E1 represents the first installation interface error; E2 represents the second installation interface error; E c This is due to manufacturing errors and deformation errors caused by stress on the hydraulic expansion sleeve itself.

[0055] Therefore, the radial offset exhibited at the detection position of transmission component 400 is actually the result of a combined error from multiple error sources. Since transmission component 400 is located at the end of the power transmission path, all error sources are concentrated at this position. Therefore, transmission component 400 can serve as an error convergence point to reflect the overall installation accuracy of the entire transmission chain.

[0056] By detecting the dynamic rotation state of the transmission component 400, the assembly quality between the output shaft 210 and the hydraulic expansion sleeve 300, the assembly quality between the hydraulic expansion sleeve 300 and the transmission component 400, and the influence of the hydraulic expansion sleeve 300 itself on the transmission accuracy can be evaluated simultaneously; thus, a comprehensive evaluation of the overall installation accuracy of the hydraulic expansion sleeve coupling can be achieved.

[0057] In one embodiment of this disclosure, please refer to Figures 4 to 7 Based on the above embodiments, this embodiment further describes the specific structure of the plunger component 330.

[0058] In this embodiment, the plunger component 330 includes a plunger body 331. The plunger body 331 is provided with a pressure ball surface 3311 at one end near the expansion screw 340, and a pressure ring 332 and a sealing ring 333 are sequentially sleeved at the other end of the plunger body 331 away from the expansion screw 340.

[0059] Specifically, the expansion screw 340 is threaded to the inner wall of the sealing cavity 323. When the expansion screw 340 is screwed into the coupling sleeve 320, its end abuts against the pressing ball surface 3311 on the plunger body 331 and pushes the plunger body 331 to move towards the hydraulic cavity.

[0060] In this embodiment, the pressing spherical surface 3311 adopts a spherical structure design. Compared with the planar pressing structure, when there is a manufacturing error or assembly error between the tightening screw 340 and the plunger body 331, the pressing spherical surface 3311 can automatically adjust the contact position, so that the axial thrust of the tightening screw 340 is applied to the plunger body 331 more evenly, thereby reducing the off-center load phenomenon and improving the stability and force uniformity of the plunger body 331 during movement.

[0061] Furthermore, a crimping ring 332 is fitted onto the end of the plunger body 331 furthest from the tightening screw 340. The crimping ring 332 can be made of metal, and its outer diameter is adapted to the inner wall of the sealing cavity 323. When the plunger body 331 is subjected to the thrust of the tightening screw 340, the crimping ring 332 can increase the pressure-bearing area between the plunger 330 and the hydraulic medium, making the pressure distribution of the hydraulic medium applied by the plunger 330 more uniform, thereby improving the hydraulic pressure transmission efficiency.

[0062] In this embodiment, the sealing ring 333 is sleeved on the plunger body 331, and the end face of the plunger body 331 is provided with a sealing groove 3312. When the plunger body 331 is squeezed by the expansion screw 340, the plunger body 331 is more easily squeezed and deformed by the setting of the sealing groove 3312, which ensures the sealing performance of the plunger part 330 to the sealing cavity 323, thereby preventing the leakage of hydraulic medium.

[0063] During the operation of the hydraulic expansion sleeve 300, the expansion screw 340 continuously applies pressure to the hydraulic medium through the plunger body 331. The sealing ring 333 can effectively maintain the stability of the internal pressure of the hydraulic chamber and avoid the hydraulic pressure drop due to hydraulic medium leakage, thereby ensuring the expansion effect of the inner sleeve 310 and the outer sleeve 320 of the coupling.

[0064] Therefore, this embodiment, through the coordinated arrangement of the crimping spherical surface 3311, the crimping ring 332, and the sealing ring 333, enables the plunger component 330 to simultaneously possess the functions of stable force bearing, uniform pressure transmission, and reliable sealing. This not only improves the stability during the hydraulic pressure build-up process but also helps to ensure the connection reliability and installation accuracy of the hydraulic expansion sleeve 300 during long-term use.

[0065] It should be noted that the radius of curvature of the crimping spherical surface 3311, the structural form of the crimping ring 332, and the material of the sealing ring 333 can all be adjusted according to the specifications of the hydraulic expansion sleeve 300 and the operating conditions. For example, the sealing ring 333 can be a rubber sealing ring, a polyurethane sealing ring, a fluororubber sealing ring, or other elastic sealing elements. As long as the sealing effect between the plunger 330 and the sealing cavity 323 can be achieved, it should fall within the protection scope of this disclosure.

[0066] Please see Figures 4 to 6Based on the above embodiments, this embodiment further describes the injection structure and anti-disassembly structure of the hydraulic expansion sleeve 300.

[0067] In this embodiment, the coupling sleeve 320 is provided with a fluid injection chamber 324 that communicates with the hydraulic chamber. The fluid injection chamber 324 is used to inject hydraulic medium into the hydraulic chamber to establish the hydraulic pressure required for the hydraulic tightening sleeve 300.

[0068] Specifically, the injection chamber 324 is provided with a sealing ball 360 and an anti-theft screw 350. The coupling sleeve 320 is located on the inner side of the injection chamber 324 and forms a sealing spherical surface 325. The sealing ball 360 is matched with the sealing spherical surface 325. The anti-theft screw 350 is threaded to the inner wall of the injection chamber 324 and is located on the side of the sealing ball 360 away from the hydraulic chamber.

[0069] During the assembly of the hydraulic expansion sleeve 300, hydraulic medium can be injected into the injection chamber 324 through an external injection device. When the hydraulic chamber reaches the preset injection volume, the injection is stopped. At this time, under the pressure of the hydraulic medium and the gravity of the sealing ball 360 itself, the sealing ball 360 presses back against the sealing ball surface 325, thereby sealing the injection channel.

[0070] Furthermore, after the anti-theft screw 350 is screwed into the liquid injection chamber 324, its end abuts against the sealing ball 360. By applying axial clamping force to the sealing ball 360 through the anti-theft screw 350, the sealing ball 360 is reliably pressed against the sealing ball surface 325, thereby forming a secondary sealing structure.

[0071] Specifically, the sealing spherical surface 325 and the sealing ball 360 form the first sealing structure, and the pressing action of the anti-theft screw 350 on the sealing ball 360 forms the second sealing guarantee. When the internal pressure of the hydraulic chamber increases, the sealing ball 360 maintains a sealed state under the combined action of the hydraulic medium pressure and the pressing force of the anti-theft screw 350, thereby reducing the risk of hydraulic medium leakage and improving the sealing reliability of the hydraulic expansion sleeve 300 during long-term operation.

[0072] In this embodiment, the anti-theft screw 350 has an opening groove 351 at the end away from the sealing ball 360, and an anti-theft post 352 is provided inside the opening groove 351. The anti-theft post 352 can be formed by a cylindrical pin, an anti-tampering pin, or other protruding structures.

[0073] Because the anti-theft post 352 is located inside the opening slot 351, ordinary flathead screwdrivers, Phillips screwdrivers, and conventional hex tools cannot effectively engage with the opening slot 351, thus preventing unauthorized personnel from disassembling the anti-theft screw 350. Only specialized tools that match the structure of the anti-theft post 352 can be inserted into the opening slot 351 and drive the anti-theft screw 350 to rotate.

[0074] By setting the anti-theft post 352, on the one hand, the hydraulic medium inside the hydraulic chamber can be prevented from being released at will, thus avoiding a decrease in the tensioning force of the hydraulic expansion sleeve 300; on the other hand, it can prevent the test state from being changed by humans during the testing process, thereby ensuring the authenticity and consistency of the test results of the installation accuracy of the hydraulic expansion sleeve 300.

[0075] In this embodiment, the sealing ball 360 is preferably made of bearing steel ball, stainless steel ball or hard alloy ball to improve its wear resistance and sealing life; the anti-theft screw 350 can be made of high-strength alloy steel or stainless steel to ensure structural strength and corrosion resistance under long-term locking condition.

[0076] It should be noted that the dimensions of the sealing ball 360, the structural form of the anti-theft screw 350, and the specific anti-theft structure of the anti-theft post 352 can all be adjusted according to actual application requirements. For example, the anti-theft post 352 can adopt a single-post structure, a double-post structure, or an irregular-shaped post structure. As long as it can achieve the anti-disassembly function, it should fall within the protection scope of this disclosure.

[0077] Please see Figure 8 Based on the above embodiments, this embodiment further describes the installation structure and testing method of the tester.

[0078] In this embodiment, a magnetic base 500 is provided on the mounting base 110, and an adjustment bracket 510 is provided on the magnetic base 500. The tester is mounted on the adjustment bracket 510. The magnetic base 500 is a structure known in the art, and its specific structure will not be described in detail.

[0079] Specifically, the magnetic base 500 can be detachably installed at any position on the surface of the mounting base plate 110. The magnetic base 500 is fixedly connected to the mounting base plate 110 by magnetic attraction, allowing the installation position of the tester to be quickly adjusted according to actual testing needs.

[0080] Furthermore, the adjusting bracket 510 is mounted on the magnetic base 500. The adjusting bracket 510 has height adjustment, front-to-back position adjustment, and angle adjustment functions. By adjusting the bracket 510, the relative position between the testing end of the tester and the transmission component 400 can be adjusted, so that the testing end of the tester accurately corresponds to the testing position of the transmission component 400.

[0081] In actual testing, when it is necessary to detect the radial offset of the outer circular surface of the transmission component 400, the height and angle of the tester can be adjusted by adjusting the bracket 510 to make the testing end of the tester contact the outer circular surface of the transmission component 400 or maintain a preset testing distance. When it is necessary to detect the rotational error at other positions, the position can also be quickly switched by moving the magnetic base 500 and adjusting the bracket 510, thereby improving the adaptability and ease of use of the testing equipment.

[0082] In this embodiment, the tester (not shown) can be a contact detection device or a non-contact detection device.

[0083] In one implementation method, a dial indicator or micrometer is used as the testing instrument. During testing, the testing head of the dial indicator or micrometer contacts the outer circular surface of the transmission component 400, and the radial offset data is obtained by reading the pointer change during the rotation of the transmission component 400. This method has a simple structure and low cost, and is suitable for routine installation accuracy testing scenarios.

[0084] As another implementation method, the tester uses a laser displacement sensor, an eddy current displacement sensor, or a contact displacement sensor. During the testing process, the displacement sensor continuously collects displacement change data during the 400° rotation of the transmission component and outputs digital test results, thereby improving testing accuracy and efficiency.

[0085] As another implementation method, the tester uses a roundness tester or a rotational accuracy measuring instrument. The roundness tester or rotational accuracy measuring instrument can obtain parameters such as roundness error, rotational error, and coaxiality error of the transmission component 400 during rotation, thereby realizing a comprehensive evaluation of the installation quality of the hydraulic expansion sleeve 300.

[0086] As another implementation, the tester employs a vision inspection device. The vision inspection device includes an industrial camera, an image acquisition module, and an image processing module. The industrial camera acquires images of the rotation process of the transmission component 400, and the image processing module calculates the rotation trajectory and radial offset of the transmission component 400 based on the acquired images, thereby achieving non-contact inspection.

[0087] In this embodiment, different types of testing instruments can be mounted on the adjustment bracket 510. When higher detection accuracy is required, a laser displacement sensor or a rotational accuracy measuring instrument can be selected; when lower detection costs are required, a dial indicator or a micrometer can be selected; when automated detection is required, a vision inspection device can be selected. Through the above structural configuration, the testing equipment of this disclosure can be flexibly configured with detection schemes according to different detection needs, thereby improving the applicability and engineering application value of the equipment.

[0088] It should be noted that the structure of the magnetic base 500, the adjustment method of the adjustment bracket 510, and the specific model of the tester can all be selected and adjusted according to the actual testing requirements. As long as the position adjustment and radial offset detection functions of the tester can be realized, they should all fall within the protection scope of this disclosure.

[0089] In one embodiment of this disclosure, the reason for using the transmission component 400 as the detection object will be explained.

[0090] Existing methods for testing the installation accuracy of hydraulic expansion sleeve couplings typically use the coupling body, hub, or hydraulic expansion sleeve as the testing object, evaluating installation quality by measuring radial runout, roundness error, or coaxiality error. The data obtained from these methods mainly reflect the local geometric accuracy of the tested component, only indicating the error state of a single installation position. However, hydraulic expansion sleeve couplings perform power transmission during actual operation. The rotational motion of the drive shaft needs to be transmitted sequentially through the first installation interface, the hydraulic expansion sleeve 300, and the second installation interface to the transmission component 400. During power transmission, eccentricity errors, tilting errors, or local assembly errors generated at any connection interface will all contribute to accuracy transmission and affect the final transmission accuracy.

[0091] Therefore, the results of local position detection of the coupling body cannot fully reflect the overall error state after power transmission. Even if the detection results of the coupling body meet the accuracy requirements, the transmission component 400 will still exhibit a large rotational offset under the combined effect of errors at multiple connection interfaces.

[0092] This disclosure allows the testing instrument to directly detect the dynamic rotational state of the power transmission end by placing the transmission component 400 at one end of the hydraulic tightening sleeve 300 and using the transmission component 400 as the test object. Since the transmission component 400 is located at the end of the power transmission path, the errors generated by the first mounting interface, the second mounting interface, and the hydraulic tightening sleeve 300 itself will all be reflected in the rotational trajectory of the transmission component 400.

[0093] In other words, the radial offset generated during the rotation of transmission component 400 is not the error of a single component, but the combined result of the combined effects of various error sources in the entire power transmission chain. By detecting the dynamic rotational accuracy of transmission component 400, the overall accuracy state formed after the hydraulic expansion sleeve coupling is installed can be obtained.

[0094] Therefore, this disclosure shifts the detection location from the coupling body to the transmission component 400 at the end of the power transmission, realizing the transformation from local geometric accuracy detection to overall transmission accuracy detection. This allows for a more realistic reflection of the installation quality and accuracy transmission capability of the hydraulic expansion coupling under actual working conditions, improving the consistency between the detection results and the actual working conditions.

[0095] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0096] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A testing device for the installation accuracy of a hydraulic expansion sleeve coupling, characterized in that, It includes a mounting base plate and a mounting vertical plate that are perpendicularly connected to each other. The mounting base plate is arranged in a horizontal state, and a test motor is vertically mounted on the mounting vertical plate. The test motor is spaced apart from the mounting base plate. The output shaft of the test motor extends out of the mounting vertical plate and serves as a simulated mounting shaft for the hydraulic expansion sleeve coupling. A hydraulic expansion sleeve is fitted onto the output shaft, and a transmission component is fitted onto the end of the hydraulic expansion sleeve away from the mounting vertical plate. The hydraulic expansion sleeve forms a keyless fixed connection with the output shaft and the transmission component respectively through its own expansion action. The test motor is used to drive the output shaft to rotate, and the transmission component is driven to rotate synchronously via the hydraulic expansion sleeve; a tester is provided on the side of the mounting plate away from the test motor, and the tester is used to detect the radial offset of the transmission component relative to the axis of the output shaft during rotation, and the radial offset is used to characterize the installation accuracy of the hydraulic expansion sleeve connection interface.

2. The hydraulic expansion sleeve coupling installation accuracy testing equipment according to claim 1, characterized in that, The hydraulic expansion sleeve includes an inner coupling sleeve and an outer coupling sleeve nested together. The inner coupling sleeve is fitted onto the outer wall of the output shaft, and the transmission component is fitted onto the outer wall of the outer coupling sleeve. A hydraulic cavity for filling with hydraulic medium is formed between the outer coupling sleeve and the inner coupling sleeve. The coupling sleeve is provided with a plunger and a tightening screw. The tightening screw is threaded into the coupling sleeve and press-fitted into the plunger to seal the hydraulic chamber.

3. The hydraulic expansion sleeve coupling installation accuracy testing equipment according to claim 2, characterized in that, The outer wall of the inner sleeve of the coupling has a first groove, and the inner wall of the outer sleeve of the coupling has a second groove. The coupling sleeve has a connecting cavity and a sealing cavity, and the first groove, the second groove, the connecting cavity and the sealing cavity together form the hydraulic cavity.

4. The hydraulic expansion sleeve coupling installation accuracy testing equipment according to claim 3, characterized in that, The inner diameter of the sealed cavity is larger than the inner diameter of the communicating cavity, and the axis of the sealed cavity is set at an angle to the axis of the communicating cavity.

5. The hydraulic expansion sleeve coupling installation accuracy testing equipment according to claim 2, characterized in that, The inner sleeve of the coupling forms a first mounting interface with the output shaft, and the outer sleeve of the coupling forms a second mounting interface with the transmission component; The radial offset detected by the tester is used to characterize the overall installation accuracy of the first installation interface and the second installation interface.

6. The hydraulic expansion sleeve coupling installation accuracy testing equipment according to any one of claims 2 to 4, characterized in that, The plunger component includes a plunger body, with a pressure ball surface at one end of the plunger body near the tightening screw, and a pressure ring and a sealing ring sequentially fitted at the other end of the plunger body away from the tightening screw.

7. The hydraulic expansion sleeve coupling installation accuracy testing equipment according to claim 6, characterized in that, The coupling sleeve has a fluid injection chamber that communicates with the hydraulic chamber, and the fluid injection chamber is equipped with an anti-theft screw and a sealing ball; The injection chamber is provided with a sealing ball surface that abuts against the sealing ball, and the anti-theft screw is threadedly connected to the coupling sleeve and abuts against the sealing ball.

8. The hydraulic expansion sleeve coupling installation accuracy testing equipment according to claim 7, characterized in that, The anti-theft screw has an opening groove at the end away from the sealing ball, and an anti-theft post is provided in the opening groove.

9. The hydraulic expansion sleeve coupling installation accuracy testing equipment according to claim 1, characterized in that, The mounting base is provided with a magnetic seat, and the magnetic seat is provided with an adjustment bracket. The adjustment bracket is used to install the tester and adjust the current position of the tester.

10. The hydraulic expansion sleeve coupling installation accuracy testing equipment according to claim 1 or 9, characterized in that, The testing instrument is any one of the following: dial indicator, micrometer, laser displacement sensor, eddy current displacement sensor, contact displacement sensor, roundness meter, rotational accuracy measuring instrument, and visual inspection device.

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