Engine suspension random vibration test clamping method

Abstract

The invention relates to the technical field of automobile engine suspension assembly random vibration tests, in particular to an engine suspension random vibration test clamping method, which comprises the following steps of data acquisition, pre-installation, coordinate reconstruction, mounting of a suspension, fixing of the suspension and mounting of an engine. Representation of suspension position data of the suspensions is realized, so that the suspensions of different models of engines or motors can completely reproduce the mounting positions, mounting heights and mounting distances on the frame, and meanwhile, the lifting arrangement of the hydraulic support assembly is matched, so that the mounting boundary conditions of the suspensions on the frame are completely and accurately simulated, and the test accuracy is improved. Test clamping, mounting and fixing of the suspension are achieved, the precision and accuracy of suspension testing are improved, and meanwhile resource waste caused by diversity of suspension clamping clamps is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of random vibration testing of automotive engine mounts, and specifically to a clamping method for random vibration testing of engine mounts. Background Art

[0002] An engine mount is an elastic support component that connects the engine to the frame / body. Its core function is to attenuate the transmission of engine vibrations to the body and support the weight of the engine.

[0003] The random vibration test of engine mounts is a test with the mount system as the core object, aiming to verify its independent performance in a complex vibration environment, rather than directly testing the engine. The test simulates the engine installation boundary conditions, applies vibration excitation to the mounts, and then evaluates key indicators such as their vibration isolation ability and fatigue life, providing data support for the design optimization of mounts and the NVH performance matching of the whole vehicle.

[0004] In addition, the random vibration test of engine mounts can be carried out on a single mount or multiple mount systems, depending on the test stage and actual requirements. Therefore, existing engine mounts require specific tooling fixtures for suspension fixation during random vibration testing to simulate the installation boundary conditions between the mounts and the frame / body and the engine. Moreover, the mounts of engines in different brands and models of vehicles are different, which results in the non-uniformity of the tooling fixtures for the corresponding engine mounts during testing.

[0005] In addition, with the development and popularization of new energy vehicles, the random vibration test of motor mounts has become more and more routine. Due to the limitations of different new energy vehicle brands and vehicle models, the tooling fixtures for motor mounts are also not unified.

[0006] For example, in the invention patent with the patent application number 202510276807.6, it specifically discloses an engine mount test bench, method, device, and storage medium, including: a vibration table for constraining and installing the engine and mounts to be tested; a support buffer member arranged below the vibration table for supporting the vibration table and the engine and mounts to be tested, so that the vibration table and the engine and mounts to be tested are in a suspended state; exciters arranged on opposite sides of the vibration table, the exciters being used to drive the vibration table to vibrate when in-phase excitation or anti-phase excitation to simulate road vibrations; a controller connected to the exciters for in-phase excitation or anti-phase excitation of the exciters. However, this test bench is only applicable to specific mounts and cannot be applied to the testing of all engine mounts or motor mounts.

[0007] Therefore, it is of great practical significance to develop a clamping method for mounts that can be used in random vibration tests for all models of engines or motor mounts. Summary of the Invention

[0008] The object of the present invention is to provide a clamping method for the random vibration test of engine mounts, so as to solve the technical problem of inconsistent clamping and fixing during the random vibration tests of engine mounts and motor mounts of different models in the above-mentioned background technology, and to realize that a clamping method can clamp and fix all engine mounts and motor mounts, and accurately simulate the installation boundary conditions of the mounts.

[0009] A clamping method for the random vibration test of engine mounts includes the following steps: Step a: Collect data. Select any mount on the engine assembly, record the installation and connection position of this mount on the vehicle frame as point M, measure the height h from point M to the horizontal ground, and take point M as the origin to establish a three-dimensional coordinate system. Sequentially collect the three-dimensional coordinates of the installation and connection positions of the remaining mounts on the engine assembly on the vehicle frame in this three-dimensional coordinate system and record them; Step b: Pre-assembly. Select a flat vibration platform, build a cross-shaped guide rail group perpendicular to each other in the X and Y axis directions on the horizontal plane of the vibration platform, and install a hydraulic support component on the cross-shaped guide rail group. The number of hydraulic support components corresponds to the number of mounts on the engine assembly; Step c: Reconstruct the coordinates. Select any installed hydraulic support component and fix it. Record the installation and connection position of the mount on this hydraulic support component as point P. Start the hydraulic support component and lift point P to a position at a height h from the vibration platform. Take this point P as the origin to establish a three-dimensional coordinate system, and move and adjust the horizontal positions of the remaining hydraulic support components and the heights of the installation and connection positions of the mounts on this hydraulic support component, so that the three-dimensional coordinates of the installation and connection positions of the mounts on the remaining hydraulic support components correspond to the three-dimensional coordinates of the mounts in step a; Step d: Install the mounts. Install the mounts on the engine assembly onto the corresponding hydraulic support components according to the corresponding coordinates; Step e: Fix the mounts. Set a rigid framework outside the hydraulic support components, and use the rigid framework to fix and rigidly support the installation and connection positions of the mounts on the hydraulic support components; Step f: Install the engine. Install the engine and fix it to the mounts through bolts.

[0010] As an improvement, in step b, the cross-shaped guide rail group includes a transverse guide rail and a longitudinal guide rail. Both the transverse guide rail and the longitudinal guide rail are horizontally arranged, and transverse guide grooves are respectively arranged along the length direction of the transverse guide rail, and longitudinal guide grooves are respectively arranged along the length direction of the longitudinal guide rail. The cross-sections of the transverse guide grooves and the longitudinal guide grooves are both convex-shaped, and the hydraulic support components respectively adjust the horizontal coordinates along the transverse guide grooves and the longitudinal guide grooves.

[0011] As an improvement, in step b, the hydraulic support assembly sequentially includes a base, a hydraulic rod, a connecting plate and a support seat from bottom to top. The base is slidably mounted on the longitudinal guide rail and is connected to the longitudinal guide rail by means of threaded fastening. The hydraulic rod stands upright on the base in the vertical direction. The connecting plate is mounted on the top of the hydraulic rod, and the support seat is mounted on the connecting plate. The corresponding suspension is mounted on the support seat.

[0012] As an improvement, the support seat is divided into a horizontal support seat, a vertical support seat and an inclined support seat; the horizontal support seat mounts the vertically arranged suspension; the vertical support seat mounts the horizontally arranged suspension; the inclined support seat mounts the inclined suspension.

[0013] As an improvement, the horizontal support seat includes a connecting flat plate, a cross wall plate and a horizontal seat which are integrally arranged. The cross wall plate connects the connecting flat plate and the horizontal seat, and the horizontally arranged suspension is mounted on the horizontal seat.

[0014] As an improvement, the vertical support seat includes a horizontally arranged cross plate and a vertically arranged vertical plate. The cross plate is horizontally arranged and is perpendicular to the vertical plate. The cross plate is connected to the connecting plate, and the horizontally arranged suspension is mounted on the vertical plate.

[0015] As an improvement, the inclined support seat includes a horizontal plate, a vertical plate and an inclined plate. The horizontal plate is horizontally arranged and is connected to the connecting plate. The vertical plate is perpendicular to the horizontal plate and stands vertically on one side of the horizontal plate. The inclined plate is inclined between the horizontal plate and the vertical plate.

[0016] As an improvement, in step e, the rigid framework includes a fixed base, a support arm and a rigid support plate. The fixed seat is arranged in a square shape and is installed and connected to the vibration platform. Slide rails are arranged on both sides inside the square of the fixed seat, and strip holes are arranged on the slide rails. The support arm moves and adjusts along the length direction of the slide rail. The support arm is telescopically adjusted in the vertical direction, and a rigid support plate is arranged at the telescopic end of the support arm. The rigid support plate supports the support seat.

[0017] As an improvement, the support arm is composed of a sliding plate at the bottom, threaded sleeves symmetrically arranged at both ends of the sliding plate, and threaded rods threadedly fitted and installed in the threaded sleeves. The threaded rods are lifted and lowered by threadedly cooperating with the threaded sleeves, and the rigid support plate is mounted on the top of the threaded rods.

[0018] As an improvement, when adjusting the lifting and lowering of the threaded rod, the threaded rod is synchronously lifted and lowered by an adjusting assembly arranged on the sliding plate.

[0019] The beneficial effects of the present invention are as follows: (1) The clamping method of the present invention realizes the reproduction of the suspension floating position data through the steps of data acquisition and coordinate reconstruction, enabling the suspensions of different models of engines or motors to fully reproduce their installation positions, installation heights, and installation distances on the vehicle frame. Meanwhile, in conjunction with the lifting setting of the hydraulic support assembly, it can fully and accurately simulate the installation boundary conditions of the suspension on the vehicle frame, achieve the installation and fixation of the suspension during the test clamping, improve the accuracy and precision of the suspension test, and avoid the waste of resources caused by the diversity of suspension clamping fixtures. (2) Through the steps of upper-installing the suspension and fixing the suspension, the clamping method of the present invention fully fixes the suspension to the hydraulic support assembly and locks the installation position, installation height, and installation tilt angle of the suspension, ensuring that the position of the suspension does not shift at all when the engine is installed on the suspension. Meanwhile, in the step of fixing the suspension, a rigid framework is used to replace the hydraulic support, avoiding the influence of hydraulic fluctuations on the suspension support during vibration testing and improving the test accuracy of the suspension. (3) By replacing the support seat, the present invention enables the support seat to be suitable for the installation of suspensions of different models and suspensions with different installation angles, thereby reducing the number of parts that need to be replaced and changed in the tooling fixture. With the smallest change amount, it can be applicable to more models of engine suspensions and motor suspensions. Meanwhile, the structure of the support seat makes the installation of the suspension particularly stable, avoiding the influence of resonance of the tooling fixture during vibration testing on the suspension. (4) In the step of fixing the suspension, when adjusting the rigid framework to fix the suspension, the threaded rods on both sides of the rigid framework rise and fall synchronously to adjust the height of the rigid support plate, ensuring the levelness of the rigid support plate. When the rigid support plate rigidly supports the suspension, it can achieve a very stable support effect, further improving the detection accuracy of the suspension.

[0020] In summary, the present invention has the advantages of strong applicability, high test accuracy, and perfect restoration of rotational installation boundary conditions, and is particularly suitable for the field of clamping and positioning technology for engine suspension testing. Description of the Drawings

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the engine assembly in Embodiment 1 of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the vibration platform in Embodiment 1 of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the hydraulic support assembly in Embodiment 1 of the present invention; Figure 4 It is a structural schematic diagram of the hydraulic support assembly installing the suspension in the present invention; Figure 5 It is a structural schematic diagram of the rigid framework rigidly fixing the suspension in the present invention; Figure 6Schematic structural diagram of the rigid frame rigidly fixing the engine assembly of the present invention; Figure 7 Top view structural diagram of the fixing base of the present invention; Figure 8 Stereoscopic structural diagram of the support arm of the present invention; Figure 9 Stereoscopic structural diagram of the adjusting component of the present invention; Figure 10 Internal structural diagram of the adjusting component of the present invention; Figure 11 Side view structural diagram of the locknut of the present invention; Figure 12 Cross-sectional structural diagram of the horizontal guide rail of the present invention; Figure 13 Stereoscopic structural diagram of the longitudinal guide rail of the present invention; Figure 14 Stereoscopic structural diagram of the round head screw of the present invention; Figure 15 Stereoscopic structural diagram of the horizontal support seat of the present invention; Figure 16 Stereoscopic structural diagram of the vertical support seat of the present invention; Figure 17 Stereoscopic structural diagram of the inclined support seat of the present invention; Figure 18 Road spectrum - X-direction signal diagram collected during the test of the present invention; Figure 19 Road spectrum - Y-direction signal diagram collected during the test of the present invention; Figure 20 Road spectrum - Z-direction signal diagram collected during the test of the present invention.

[0022] Reference numerals in the figure: Engine assembly 000, Mount 10, Vibration platform 1, Cross-shaped guide rail group 2, Horizontal guide rail 21, Horizontal guide groove 211, Longitudinal guide rail 22, Longitudinal guide groove 221, Countersunk screw hole 222, Round head screw 223, Hexagonal nut 224, Hydraulic support assembly 3, Base 31, Hydraulic rod 32, Connecting plate 33, Support seat 34, Horizontal support seat 341, Connecting flat plate 3411, Cross-shaped wall panel 3412, Horizontal seat 3413, Vertical support seat 342, Horizontal plate 3421, Vertical plate 3422, Inclined support seat 343, Horizontal plate 3431, Vertical plate 3432, Inclined plate 3433, Rigid frame 5, Locknut 500, Fixed base 51, Slide rail 511, Strip-shaped hole 512, Support arm 52, Sliding plate 521, Threaded sleeve 522, Threaded rod 523, Rigid support plate 53, Adjusting component 54, Sprocket group 541, Rotating shaft 542, Handle 543. Detailed implementation manners

[0023] The endpoints and any values within the ranges disclosed in this document are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in this document.

[0024] The following is a detailed description of the specific embodiments of the present invention. However, it should be noted that the protection scope of the present invention is not limited by these specific embodiments, but is determined by the appended claims.

[0025] All publications, patent applications, patents, and other references mentioned in this specification are hereby incorporated by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In case of conflict, the definitions in this specification shall prevail.

[0026] When this specification uses prefixes such as "known to those skilled in the art", "prior art", or similar terms to derive materials, substances, methods, steps, devices, or components, etc., the objects derived by these prefixes cover those commonly used in the art at the time when the present invention is proposed, but also include those that are not commonly used at present but will become recognized by the art as suitable for similar purposes.

[0027] It should be specifically noted that two or more aspects (or embodiments) disclosed in the context of this specification can be combined with each other arbitrarily. The technical solutions (such as methods or systems) thus formed belong to a part of the original disclosure of this specification and also fall within the protection scope of the present invention.

[0028] Unless otherwise specified, all percentages, parts, ratios, etc. mentioned in this specification are based on weight, unless it does not conform to the common understanding of those skilled in the art when based on weight.

[0029] Example 1: As Figures 1 to 6 shown, a clamping method for random vibration test of engine mounts includes the following steps: Step a, collect data. Select any mount on the engine assembly, record the installation and connection position of this mount on the vehicle frame as point M, measure the height h from point M to the horizontal ground, and establish a three-dimensional coordinate system with point M as the origin. Sequentially collect the three-dimensional coordinates of the installation and connection positions of the remaining mounts on the engine assembly on the vehicle frame in this three-dimensional coordinate system and record them; Step b, pre-installation: Select a flat vibration platform, build a cross-shaped guide rail group perpendicular to each other in the X and Y axis directions on the horizontal plane of the vibration platform, and install a hydraulic support component on the cross-shaped guide rail group. The number of hydraulic support components corresponds to the number of mounts on the engine assembly; Step c, coordinate reconstruction: Select any one of the installed hydraulic support components and fix it. Denote the installation connection position of the mount on this hydraulic support component as point P. Start the hydraulic support component, lift point P to a position at a height h from the vibration platform, and establish a three-dimensional coordinate system with this point P as the origin. Then move and adjust the horizontal positions of the other hydraulic support components and the heights of the installation connection positions of the mounts on this hydraulic support component, so that the three-dimensional coordinates of the installation connection positions of the mounts on the other hydraulic support components correspond to the three-dimensional coordinates of the mounts in step a; Step d, install the mounts: Install the mounts on the engine assembly onto the corresponding hydraulic support components according to the corresponding coordinates; Step e, fix the mounts: Set a rigid framework outside the hydraulic support component, and use the rigid framework to fix and rigidly support the installation connection positions of the mounts on the hydraulic support component; Step f, install the engine: Install the engine and fix it to the mounts by bolts.

[0030] As Figure 1 shown, Figure 1 in the engine assembly 000, there are three groups of different mounts 10. Among them, two groups of mounts 10 are vertically arranged mounts, and one group of mounts 10 is a horizontal mount. Select any one group of mounts 10, denote the installation connection position of this mount on the frame as point M, record the height from point M to the ground as h, and then establish a three-dimensional coordinate system with point M as the origin. Denote the coordinates of the installation connection positions of the other two groups of mounts on the frame as X1, Y1, Z1 / X2, Y2, Z2 respectively.

[0031] After that, as Figure 2 shown, select a flat vibration platform, build a cross-shaped guide rail group 2 perpendicular to each other in the X and Y axis directions on the horizontal plane of the vibration platform 1, and install a hydraulic support component 3 on the cross-shaped guide rail group 2. The number of hydraulic support components 3 corresponds to the number of mounts 10 on the engine assembly, that is, one group of mounts 10 is installed on each hydraulic support component 3.

[0032] Immediately after that, as Figure 3As shown, select any installed hydraulic support assembly 3, fix its horizontal position on the cross-shaped guide rail group 2, and mark the suspension installation connection position on this hydraulic support assembly 3 as point P. Start the hydraulic support assembly 3, lift point P to a position at a height h from the vibration platform, and establish a three-dimensional coordinate system with this point P as the origin. Install the suspension 10 located at the origin in step a at point P, and move and adjust the horizontal positions of the remaining hydraulic support assemblies, as well as the heights of the suspension installation connection positions on this hydraulic support assembly, so that the three-dimensional coordinates of the suspension installation connection positions on the remaining hydraulic support assemblies correspond to the three-dimensional coordinates of the suspension in step a, that is, reach X1, Y1, Z1 / X2, Y2, Z2. Then install the remaining suspensions 10 onto the corresponding hydraulic support assemblies according to the coordinates. The installation effect is as Figure 4 shown.

[0033] Finally, as Figure 5 shown, on the vibration platform 1, install a rigid framework 5 around the hydraulic support assembly 3. The rigid framework 5 fixes and rigidly supports the suspension installation connection positions on each group of hydraulic support assemblies 3. Finally, install the engine 001 onto the corresponding suspension 10. The installation diagram is as Figure 6 shown. After the engine 001 is installed, arrange a three-direction acceleration sensor at the engine suspension. Collect the road spectrum signal by driving the test vehicle through the Belgian road. Among them, driving the test vehicle through the Belgian road is simulated by vibration excitation, that is, the real stress state when the vehicle passes through the Belgian road is simulated by three-direction (X / Y / Z) vibration coupling, and then test the performance such as the durability, vibration and noise (NVH) of the suspension, as Figures 18 to 20 shown, which is the road spectrum signal diagram collected during the suspension test of the present invention.

[0034] As Figures 6 to 10 shown, specifically, the rigid framework 5 includes a fixed base 51, a support arm 52 and a rigid support plate 53. The fixed seat 51 is arranged in a square shape, and this fixed seat 51 is installed and connected to the vibration platform 1. Slide rails 511 are arranged on both inner sides of the square of the fixed seat 51, and strip holes 512 are arranged on these slide rails 511. The support arm 52 moves and adjusts along the length direction of the slide rail 511, and the support arm 52 is telescopically adjusted in the vertical direction. And a rigid support plate 53 is arranged at the telescopic end of the support arm 52. This rigid support plate 53 supports the support seat 34 in the hydraulic support assembly 3. Among them, the rigid support plate 53 is made of a material with the same stiffness as the vehicle frame, and the modal frequency is 2-3 times higher than the highest test frequency to avoid resonance with the suspension.

[0035] Further, the support arm 52 is composed of a sliding plate 521 at the bottom, threaded sleeves 522 symmetrically arranged at both ends of the sliding plate, and threaded rods 523 threadedly fitted into the threaded sleeves. The threaded rod 523 is adjusted in height by being threadedly engaged with the threaded sleeve 522. The rigid support plate 53 is installed at the top of the threaded rod 523. When the rigid support plate 53 is installed and connected to the threaded steel 523, a locknut 500 is used for tightening and locking connection. The structure of the locknut 500 is as Figure 11 shown.

[0036] Among them, when adjusting the lifting of the threaded rod 523, the threaded rod 523 is synchronously adjusted in height through an adjusting assembly 54 provided on the sliding plate 521.

[0037] As Figures 9 to 10 shown, specifically, the adjusting assembly 54 includes two sets of sprocket groups 541, a rotating shaft 542, and a handle 543. The threaded sleeve 522 is rotatably installed on the sliding plate 521. The outside of the threaded sleeve 522 is wrapped with a housing to prevent the threaded sleeve 522 from coming off. A set of sprocket groups 541 are respectively arranged at the bottom of the threaded sleeve 522. The sprocket groups 541 are drivingly connected to the rotating shaft 542. The rotating shaft 542 is located at the middle position of the sliding plate 521. When the rotating shaft 542 rotates through the sprocket groups 541, the two sets of threaded sleeves 522 can be driven to rotate. Since the top of the threaded rod 523 passing through the threaded sleeve 522 is connected and locked by the rigid support plate 53, the threaded rod 523 only has axial freedom, and the circumferential freedom is locked, that is, the threaded rod 523 cannot rotate and can only achieve the lifting effect through the rotation of the threaded sleeve 522. It should be emphasized that the threads of the two sets of threaded rods 523 and the threaded sleeves 522 are arranged in reverse, just corresponding to the forward and reverse rotations of the threaded sleeve 522. In addition, after the threaded rod 523 is in place in terms of lifting, at the connection part of the threaded rod 523 and the threaded sleeve 522, it is also locked by the locknut 500 to prevent vibration interference between the threaded rod 523 and the threaded sleeve 522 during the vibration test and affect the test results. The handle 543 is installed at the top of the rotating shaft 542, and the handle 543 is foldable at the top of the rotating shaft 542, that is, the handle 543 is hinged to the rotating shaft 542, and a rotation angle limit is set at the hinged position of the handle 543 and the rotating shaft 542, that is, the handle 543 can only be rotated and switched between the vertical state and the horizontal state, so that the threaded rod 523 can be quickly lifted and retracted by operating the handle 543 in a narrow space.

[0038] Embodiment 2: Referring to Embodiment 1, the difference between Embodiment 2 and Embodiment 1 of the present invention is: As Figure 4 、 Figures 12 to 17As shown, the cross-shaped guide rail group 2 includes a transverse guide rail 21 and a longitudinal guide rail 22. Both the transverse guide rail 21 and the longitudinal guide rail 22 are horizontally arranged. Among them, the transverse guide rail 21 is installed and connected to the vibration platform 1. The longitudinal guide rail 22 is erected on the transverse guide rail 21 and can be horizontally adjusted along the transverse guide rail 21. The transverse guide rail 21 is respectively provided with transverse guide grooves 211 along its own length direction, and the longitudinal guide rail 22 is respectively provided with longitudinal guide grooves 221 along its own length direction. The cross-sections of the transverse guide grooves 211 and the longitudinal guide grooves 221 are both convex. A countersunk screw hole 222 is opened downward on the longitudinal guide rail 22, and a round head screw 223 is inserted into the countersunk screw hole 222. The round head screw 223 is inserted into the transverse guide groove 211, and a hexagonal nut 224 is horizontally movably arranged in the transverse guide groove 211. A set of parallel opposite sides of the hexagonal nut 224 just abut and fit with the two side walls at the bottom of the transverse guide groove 211, that is, the transverse guide groove 211 limits the circumferential freedom of the hexagonal nut 224, and the hexagonal nut 224 is in threaded cooperation with the round head screw 223. After the round head screw 223 and the hexagonal nut 224 are tightened, the relative fixation of the longitudinal guide rail 22 on the transverse guide rail 21 is realized, that is, the X-axis coordinate of the corresponding hydraulic support assembly 3 is locked.

[0039] Further, the hydraulic support assembly 3 sequentially includes a base 31, a hydraulic rod 32, a connecting plate 33 and a support seat 34 from bottom to top. The base 31 is slidably installed on the longitudinal guide rail 22 and is connected to the longitudinal guide rail 22 by means of threaded fastening (it should be emphasized here that the fixed connection method between the base 31 and the longitudinal guide rail 22 is the same as the fixed connection method between the longitudinal guide rail 22 and the transverse guide rail 21. After the hydraulic support assembly 3 and the longitudinal guide rail 22 are relatively fixed by means of threaded fastening, that is, the coordinates of the hydraulic support assembly 3 in the X-axis direction and the Y-axis direction are all locked). The hydraulic rod 32 stands upright on the base 31 in the vertical direction (i.e., the Z-axis direction). The connecting plate 33 is installed at the top of the hydraulic rod 32, and the support seat 34 is installed on the connecting plate 33. The support seat 34 installs the corresponding suspension 10. After the X-axis coordinate and the Y-axis coordinate of the hydraulic support assembly 3 are both locked, the coordinate in the Z-axis direction is determined by adjusting the lifting height of the hydraulic rod 32. Specifically, the hydraulic rod 32 adopts the method of hydraulic lifting, that is, the hydraulic rod 32 is connected to an external hydraulic station, and the hydraulic station fills or discharges liquid into the hydraulic rod 32 to change the pressure inside the hydraulic rod 32, so that the hydraulic rod 32 rises or falls.

[0040] Among them, the support seat 34 is divided into a horizontal support seat 341, a vertical support seat 342 and an inclined support seat 343; the horizontal support seat 341 installs a vertically arranged suspension; the vertical support seat 342 installs a horizontally arranged suspension; the inclined support seat 343 installs an inclinedly arranged suspension.

[0041] Specifically, the horizontal support base 341 includes a connecting flat plate 3411, a cross wall plate 3412 and a horizontal base 3413 which are integrally arranged. The cross wall plate 3412 connects the connecting flat plate 3411 and the horizontal base 3413, and the vertical suspension 10 is installed on the horizontal base 3413 which is vertically arranged.

[0042] The vertical support base 342 includes a horizontal plate 3421 and a vertical plate 3422 which are integrally arranged. The horizontal plate 3421 is horizontally arranged and is perpendicular to the vertical plate 3422. The horizontal plate 3421 is connected to the connecting plate 33, and the vertical suspension 10 is installed on the vertical plate 3422 which is horizontally arranged.

[0043] The inclined support base 343 includes a horizontal plate 3431, a vertical plate 3432 and an inclined plate 3433. The horizontal plate 3431 is horizontally arranged and is connected to the connecting plate 33. The vertical plate 3432 is perpendicular to the horizontal plate 3431 and stands vertically on one side of the horizontal plate 3431. The inclined plate 3433 is inclined between the horizontal plate 3431 and the vertical plate 3432 to form a triangular structure, and the inclined vertical suspension 10 is installed on the inclined plate 3433.

[0044] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A clamping method for random vibration test of engine mounts, characterized in that, The method includes the following steps: Step a: Collect data. Select any mount on the engine assembly, mark the installation and connection position of this mount on the vehicle frame as point M, measure the height h from point M to the horizontal ground, and take point M as the origin to establish a three-dimensional coordinate system. Sequentially collect and record the three-dimensional coordinates of the installation and connection positions of the remaining mounts on the engine assembly on the vehicle frame in this three-dimensional coordinate system; Step b: Pre-assembly. Select a flat vibration platform, build a cross-shaped guide rail group that is vertically staggered in the X and Y axis directions on the horizontal plane of the vibration platform, and install a hydraulic support assembly on the cross-shaped guide rail group. The number of hydraulic support assemblies corresponds to the number of mounts on the engine assembly; Step c: Reconstruct coordinates. Select any installed hydraulic support assembly, fix it, mark the installation and connection position of the mount on this hydraulic support assembly as point P, start the hydraulic support assembly, lift point P to a position at a height h from the vibration platform, and take this point P as the origin to establish a three-dimensional coordinate system. Move and adjust the horizontal positions of the remaining hydraulic support assemblies and the heights of the installation and connection positions of the mounts on this hydraulic support assembly so that the three-dimensional coordinates of the installation and connection positions of the mounts on the remaining hydraulic support assemblies correspond to the three-dimensional coordinates of the mounts in step a; Step d: Install the mounts. Install the mounts on the engine assembly onto the corresponding hydraulic support assemblies according to the corresponding coordinates; Step e: Fix the mounts. Set a rigid frame outside the hydraulic support assembly, and use the rigid frame to fix and rigidly support the installation and connection positions of the mounts on the hydraulic support assembly; Step f: Install the engine. Install the engine and fix it to the mounts by bolts.

2. A clamping method for random vibration test of engine mounts according to claim 1, characterized in that: In step b, the cross-shaped guide rail group includes a transverse guide rail and a longitudinal guide rail. Both the transverse guide rail and the longitudinal guide rail are horizontally arranged, and transverse guide grooves are respectively arranged along the length direction of the transverse guide rail, and longitudinal guide grooves are respectively arranged along the length direction of the longitudinal guide rail. The interfaces of the transverse guide grooves and the longitudinal guide grooves are both convexly arranged, and the hydraulic support assemblies respectively adjust the horizontal coordinates along the transverse guide grooves and the longitudinal guide grooves.

3. A clamping method for random vibration test of engine mounts according to claim 2, characterized in that: In step b, the hydraulic support assembly sequentially includes a base, a hydraulic rod, a connecting plate and a support seat from bottom to top. The base is slidably installed on the longitudinal guide rail and is connected to the longitudinal guide rail by means of screw fastening. The hydraulic rod stands vertically on the base in the vertical direction. The connecting plate is installed at the top of the hydraulic rod, and the support seat is installed on the connecting plate, and the corresponding mount is installed on this support seat.

4. A clamping method for random vibration test of engine mounts according to claim 3, characterized in that: The support seat is divided into a horizontal support seat, a vertical support seat and an inclined support seat; the horizontal support seat installs a vertically arranged mount; the vertical support seat installs a horizontally arranged mount; the inclined support seat installs an inclinedly arranged mount.

5. A clamping method for random vibration test of engine mounts according to claim 4, characterized in that: The horizontal support base includes a connecting flat plate, a cross wall plate and a horizontal base which are integrally arranged. The cross wall plate connects the connecting flat plate and the horizontal base, and the horizontal base is used to install the vertically arranged mount.

6. A clamping method for random vibration test of engine mounts according to claim 4, characterized in that: The vertical support base includes a horizontally arranged cross plate and a vertically arranged vertical plate. The cross plate is horizontally arranged and is perpendicular to the vertical plate. The cross plate is connected to the connecting plate, and the vertical plate is used to install the horizontally arranged mount.

7. A clamping method for random vibration test of engine mounts according to claim 4, characterized in that: The inclined support base includes a horizontal plate, a vertical plate and an inclined plate. The horizontal plate is horizontally arranged and is connected to the connecting plate. The vertical plate is perpendicular to the horizontal plate and stands vertically on one side of the horizontal plate. The inclined plate is inclined between the horizontal plate and the vertical plate.

8. A clamping method for random vibration test of engine mounts according to claim 3, characterized in that: In step e, the rigid framework includes a fixed base, a support arm and a rigid support plate. The fixed seat is arranged in a square shape and is installed and connected to the vibration platform. Slide rails are arranged on both inner sides of the square of the fixed seat, and strip-shaped holes are arranged on the slide rails. The support arm moves and adjusts along the length direction of the slide rail, and the support arm is telescopically adjusted in the vertical direction. A rigid support plate is arranged at the telescopic end of the support arm, and the rigid support plate supports the support base.

9. A clamping method for random vibration test of engine mounts according to claim 8, characterized in that: The support arm is composed of a sliding plate at the bottom, threaded sleeves symmetrically arranged at both ends of the sliding plate, and threaded rods threadedly installed in the threaded sleeves. The threaded rods are lifted and lowered by threadedly cooperating with the threaded sleeves, and the rigid support plate is installed at the top of the threaded rods.

10. A clamping method for random vibration test of engine mounts according to claim 9, characterized in that: When adjusting the lifting and lowering of the threaded rod, the threaded rod is synchronously lifted and lowered through an adjusting component arranged on the sliding plate.

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