Mcpherson front suspension assembly brake test device and test method thereof

Abstract

The application provides a MacPherson front suspension assembly brake test device and a test method thereof. The MacPherson front suspension assembly brake test device comprises a sample part to be tested, an inertia platform main shaft, an electric cylinder loading assembly, a test fixture electric cylinder fixing assembly and a test fixture sample assembly. The first end of the sample part to be tested is connected with the inertia platform main shaft, the second end is connected with the electric cylinder loading assembly, and the third end is connected with the test fixture sample assembly. The test fixture electric cylinder fixing assembly is installed on the test fixture sample assembly, and the electric cylinder loading assembly is fixed on the test fixture electric cylinder fixing assembly. The application combines a 1 / 4 front suspension brake assembly and a steering cross rod test device, and the device is designed according to the real vehicle posture. The device is simple in design, convenient to manufacture and easy to install. The test method can be used to separately test the brake fatigue strength of the MacPherson front suspension angle assembly under the brake working condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of brake test device, in particular to a McPherson front suspension assembly brake test device and a test method thereof. BACKGROUND

[0002] Currently, in order to better simulate the state of the real vehicle, the main plant will use the front suspension brake angle assembly (system level) brake test (such as shown in the figure) to replace the brake device composed of only disc / drum and caliper. The McPherson front suspension brake angle assembly (1 / 4 front suspension brake assembly) brake test has a steering knuckle, and a transverse link is installed on a fixed clamp, and the equipment of the brake test bench is borrowed to simulate high-speed braking, low-speed braking, continuous braking or alternating working condition test. Figure 1

[0003] Such conventional brake test can indirectly simulate the braking performance of the real vehicle, but the defect is that the steering link is fixed at the end of the clamp, which is not the real vehicle state.

[0004] Therefore, the present application provides a McPherson front suspension assembly brake test device and a test method thereof to overcome the above technical problems. SUMMARY

[0005] The present application provides a McPherson front suspension assembly brake test device and a test method thereof to overcome the defect that the steering link is fixed at the end of the clamp in the prior art front suspension brake angle assembly, which is not the real vehicle state.

[0006] The present application solves the above technical problems by the following technical solutions:

[0007] A McPherson front suspension assembly brake test device, characterized in that the McPherson front suspension assembly brake test device comprises a sample to be tested part, an inertia table main shaft, an electric cylinder loading assembly, a test clamp electric cylinder fixed assembly and a test clamp sample assembly, a first end of the sample to be tested part is connected with the inertia table main shaft, a second end is connected with the electric cylinder loading assembly, and a third end is connected with the test clamp sample assembly, the test clamp electric cylinder fixed assembly is installed on the test clamp sample assembly, and the electric cylinder loading assembly is fixed on the test clamp electric cylinder fixed assembly.

[0008] According to one embodiment of the present application, the sample to be tested part comprises a McPherson front suspension brake angle assembly, a transverse link, a locking nut and a rod end bearing, one end of the transverse link is connected with the lower part of the McPherson front suspension brake angle assembly, and one end of the rod end bearing is connected with the other end of the transverse link through the locking nut. ​

[0009] According to one embodiment of the present application, the inertia platform main shaft comprises a brake test bench driving part, a coupling and a bolt nut connecting mechanism, one end of the coupling is connected with the universal joint of the brake test bench driving part through the bolt nut connecting mechanism.

[0010] According to one embodiment of the present application, the electric cylinder loading assembly comprises an electric cylinder, an adapter rod and a rod end bearing clamping block connected in sequence, the rod end bearing clamping block is connected with the other end of the rod end bearing through a connecting pin.

[0011] According to one embodiment of the present application, the test fixture electric cylinder fixing assembly comprises a control arm fixing plate, an electric cylinder stabilizing frame, a pressing plate bolt and an actuator bolt, the electric cylinder stabilizing frame is fixed at the upper end of the control arm fixing plate through a plurality of pressing plate bolts, so that a mounting hole is formed between the electric cylinder stabilizing frame and the control arm fixing plate.

[0012] The adapter rod is arranged in the mounting hole, and the electric cylinder is connected with the control arm fixing plate and the electric cylinder stabilizing frame through the actuator bolt.

[0013] According to one embodiment of the present application, the test fixture sample assembly comprises a suspension fixing base frame and an adjustable shock absorber mounting support, the adjustable shock absorber mounting support is mounted on one side of the suspension fixing base frame, the third part of the sample to be tested is connected with the top of the suspension fixing base frame, and the control arm fixing plate is mounted on the suspension fixing base frame and located between the suspension fixing base frame and the adjustable shock absorber mounting support.

[0014] The present application also provides a test method of the brake test device of the McPherson front suspension assembly, which is characterized in that the test method adopts the brake test device of the McPherson front suspension assembly as described above, when the test method examines the fatigue strength of the McPherson front suspension brake angle assembly under the steering working condition, the brake test bench only rotates at a constant speed, does not brake under the braking working condition, the electric cylinder simulates the steering working condition, and loads a fixed amplitude of the equal-amplitude alternating cyclic load or a random load simulating a road load spectrum.

[0015] According to one embodiment of the present application, the test method comprises the following steps:

[0016] S1, collecting a strain signal of a transverse tie rod through a strain gauge from a test field road test of a real vehicle;

[0017] S2, in the fatigue strength test of the McPherson front suspension and brake angle assembly, the road spectrum signal, i.e. the road simulation signal, transmitted to the McPherson front suspension and brake angle assembly by the steering tie rod of the vehicle in actual driving is considered, and the signal is generally a force signal. The strain signal in step S1 is converted into a force signal through bench test calibration;

[0018] S3, after equivalent damage calculation of the force signal, a fixed-amplitude equivalent alternating cyclic load is converted, or a random load simulating a road load spectrum is formed through filtering, compression, splicing and other processing of the signal;

[0019] S4, an electric cylinder is used, the force signal is iterated or equally loaded through remote parameter control software or a signal loading control program, a driving signal is obtained to drive the electric cylinder to perform an action, so that the load in the steering condition is applied to the McPherson front suspension and brake angle assembly;

[0020] S5, while the load in the steering condition is applied to the McPherson front suspension and brake angle assembly in step S4, the brake test bench can be designed to rotate at a uniform speed alternately, but the whole process does not do the braking condition.

[0021] The application also provides a test method of the McPherson front suspension assembly brake test device, characterized in that the test method adopts the McPherson front suspension assembly brake test device as described above, when the test method examines the braking fatigue strength of the McPherson front suspension angle assembly in the braking condition, only the brake test bench works, and continuous or single braking is carried out under different rotating directions, temperatures, speeds and decelerations or braking pressures, so as to examine the braking performance under different temperatures, speeds and braking pressures.

[0022] According to one embodiment of the application, the test method comprises the following steps:

[0023] S1, during the braking condition test on a test field road of an actual vehicle, a speed sensor, an acceleration sensor, a temperature sensor and a pressure sensor are mounted to collect the speed signal, the acceleration signal and the temperature signal of the brake disc in the McPherson front suspension and brake angle assembly in the braking condition, and the braking pressure signal in the brake pipeline;

[0024] S2, after filtering, compression and splicing processing of the collected signals, effective speed, acceleration, temperature and pressure signals are formed as target signals set in the brake test bench;

[0025] S3, the speed, acceleration, temperature and pressure parameters in step S2 are set through remote parameter control software, and equivalent loading is implemented through the inertia bench main shaft 20.

[0026] The application further provides a test method of the MacPherson front suspension assembly brake test device, characterized in that the test method adopts the MacPherson front suspension assembly brake test device as described above.

[0027] According to one embodiment of the application, the test method comprises the following steps:

[0028] S1, when performing the steering brake working condition test on the test field road of an actual vehicle, the strain gauge, the rotation speed sensor, the acceleration sensor, the temperature sensor and the pressure sensor are loaded to collect the force signal of the transverse pull rod, the rotation speed signal of the brake disc, the temperature signal and the brake pressure signal;

[0029] S2, the strain signal of the step S1 is converted into the force signal through the bench test calibration;

[0030] S3, after the collected signals are filtered, compressed and spliced, the equal-amplitude alternating cyclic load is formed as the target signal applied by the electric cylinder;

[0031] S4, the step S3 is synchronized, and the rotation speed signal, the acceleration signal, the temperature signal and the brake pressure signal are collected as the target signal of the brake test bench to perform the test on the inertia bench main shaft in the MacPherson front suspension angle assembly brake test device.

[0032] The positive progress effect of the application is that:

[0033] The MacPherson front suspension assembly brake test device and the test method thereof are combined with the 1 / 4 front suspension brake assembly and the steering transverse pull rod test device, the actual vehicle posture is designed during the design of the device, the device is simple in design, convenient in manufacturing and easy to install.

[0034] The test method can not only separately examine the brake fatigue strength of the MacPherson front suspension angle assembly under the brake working condition, the fatigue strength of the MacPherson front suspension and the brake angle assembly under the steering working condition, but also examine the brake fatigue strength of the MacPherson front suspension angle assembly under the turning and emergency brake working condition. Moreover, the three can be alternately performed to make up for the separate test and the single working condition (combined working condition one or working condition two) test state. The time and economic cost are saved, and the MacPherson front suspension and brake angle assembly brake test can be widely promoted. BRIEF DESCRIPTION OF DRAWINGS

[0035] The above and other features, aspects and advantages of the present application will become more apparent from the following description of the application taken in conjunction with the accompanying drawings, wherein like reference numerals designate the same features throughout the figures, and wherein:

[0036] Figure 1 It is a structural schematic view of the prior art front suspension brake angle assembly brake test device.

[0037] Figure 2 It is a perspective view of the MacPherson front suspension assembly brake test device of the present application.

[0038] Figure 3 It is a front view of the MacPherson front suspension assembly brake test device of the present application.

[0039] Figure 4 It is a structural schematic view of the sample part in the MacPherson front suspension assembly brake test device of the present application.

[0040] Figure 5 It is a structural schematic view of the MacPherson front suspension brake angle assembly in the MacPherson front suspension assembly brake test device of the present application.

[0041] Figure 6 It is a structural schematic view of the inertia table main shaft in the MacPherson front suspension assembly brake test device of the present application.

[0042] Figure 7 It is a structural schematic view of the brake test table driving part in the MacPherson front suspension assembly brake test device of the present application.

[0043] Figure 8 It is a structural schematic view of the coupling in the MacPherson front suspension assembly brake test device of the present application.

[0044] Figure 9 It is a mounting schematic view of the electric cylinder loading assembly in the MacPherson front suspension assembly brake test device of the present application.

[0045] Figure 10 It is a structural schematic view of the electric cylinder in the MacPherson front suspension assembly brake test device of the present application.

[0046] Figure 11 It is a structural schematic view of the test fixture electric cylinder fixing assembly in the MacPherson front suspension assembly brake test device of the present application.

[0047] Figure 12 It is a structural schematic view of the control arm fixing plate in the MacPherson front suspension assembly brake test device of the present application.

[0048] Figure 13 It is a structural schematic view of the electric cylinder stabilizing frame in the MacPherson front suspension assembly brake test device of the present application.

[0049] Figure 14 The structure schematic diagram of the test fixture sample assembly of the MacPherson front suspension assembly brake test device. DETAILED DESCRIPTION

[0050] In order to make the above objectives, characteristics and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0051] Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0052] Further, although the terms used in the present application are selected from publicly-known terms, some of the terms mentioned in the specification of the present application can be selected by the applicant from his or her judgment, and the detailed meanings thereof are described in the relevant part of the description herein.

[0053] Further, the present application is to be understood not only in the sense of the actual terms used but also in the sense of the meanings of each term impliedly derived therefrom.

[0054] Figure 2 The perspective view of the MacPherson front suspension assembly brake test device of the present application. Figure 3 The front view of the MacPherson front suspension assembly brake test device of the present application.

[0055] As shown in Figure 2 and Figure 3 The present application discloses a MacPherson front suspension assembly brake test device, which comprises a sample part 10 to be tested, an inertia table main shaft 20, an electric cylinder loading assembly 30, an electric cylinder fixing assembly 40 of a test fixture, and a sample assembly 50 of a test fixture, the first end of the sample part 10 to be tested is connected with the inertia table main shaft 20, the second end is connected with the electric cylinder loading assembly 30, the third end is connected with the sample assembly 50 of the test fixture, the electric cylinder fixing assembly 40 of the test fixture is installed on the sample assembly 50 of the test fixture, and the electric cylinder loading assembly 30 is fixed on the electric cylinder fixing assembly 40 of the test fixture.

[0056] Figure 4 The structure schematic diagram of the sample part to be tested in the MacPherson front suspension assembly brake test device of the present application. Figure 5 The structure schematic diagram of the MacPherson front suspension brake angle assembly in the MacPherson front suspension assembly brake test device of the present application.

[0057] As shown in Figure 4 and Figure 5As shown in the figure, the sample part 10 to be tested includes a McPherson front suspension brake angle assembly 11, a transverse tie rod 12, a locking nut 13 and a rod end bearing 14, one end of the transverse tie rod 12 is connected with the lower part of the McPherson front suspension brake angle assembly 11, and one end of the rod end bearing 14 is connected with the other end of the transverse tie rod 12 through the locking nut 13. The rod end bearing 14 is connected according to the actual vehicle assembly state.

[0058] Figure 6 The structure diagram of the inertia table main shaft in the McPherson front suspension assembly brake test device of the application. Figure 7 The structure diagram of the brake test table driving part in the McPherson front suspension assembly brake test device of the application. Figure 8 The structure diagram of the coupling in the McPherson front suspension assembly brake test device of the application.

[0059] As Figures 6 to 8 shown, the inertia table main shaft 20 includes a brake test table driving part 21, a coupling 22 and a bolt nut connecting mechanism 23, one end of the coupling 22 is connected with the universal joint 211 of the brake test table driving part 21 through the bolt nut connecting mechanism 23. The brake test table driving part 21 with the universal joint 211 and the coupling 22 are connected by the bolt nut connecting mechanism 23, and the coupling 22 is connected to the brake disc part of the McPherson front suspension brake angle assembly 11 by the bolt 24.

[0060] Figure 9 The installation diagram of the electric cylinder loading assembly in the McPherson front suspension assembly brake test device of the application. Figure 10 The structure diagram of the electric cylinder in the McPherson front suspension assembly brake test device of the application.

[0061] As Figure 9 and Figure 10 shown, the electric cylinder loading assembly 30 includes an electric cylinder 31, an adapter rod 32 and a rod end bearing clamping block 33 connected in sequence, and the other end of the rod end bearing 14 is connected with the rod end bearing clamping block 33 through a connecting pin. The rod end bearing clamping block 33 and the connecting pin connect the rod end bearing 14, and drive the electric cylinder 31 to the tie rod to realize the simulation of the axial load of the tie rod.

[0062] Figure 11 The structure diagram of the test fixture electric cylinder fixing assembly in the McPherson front suspension assembly brake test device of the application. Figure 12 The structure diagram of the control arm fixing plate in the McPherson front suspension assembly brake test device of the application. Figure 13 The structure diagram of the electric cylinder stabilizing frame in the McPherson front suspension assembly brake test device of the application.

[0063] AsFigures 11 to 13 As shown, the test fixture electric cylinder fixing assembly 40 includes a control arm fixing plate 41, an electric cylinder stabilizer 42, pressure plate bolts 43, and actuator bolts 44. The electric cylinder stabilizer 42 is fixed to the upper end of the control arm fixing plate 41 by multiple pressure plate bolts 43, forming a mounting hole A between the electric cylinder stabilizer 42 and the control arm fixing plate 41. The adapter rod 32 passes through the mounting hole A, and the electric cylinder 31 is connected to the control arm fixing plate 41 and the electric cylinder stabilizer 42 by the actuator bolts 44.

[0064] The control arm mounting plate 41 connects to the control arm part of the MacPherson front suspension brake angle assembly 11. The electric cylinder stabilizer 42 is fixed to the control arm mounting plate 41 with the pressure plate bolt 43, and the actuator bolt 44 is used to fix the electric cylinder 31.

[0065] Figure 14 This is a schematic diagram of the overall structure of the test fixture sample assembly in the MacPherson strut front suspension assembly braking test device of the present invention.

[0066] like Figure 14 As shown, the test fixture sample assembly 50 is used to connect the suspension portion of the MacPherson strut front suspension brake angle assembly 11 and fix it to the brake test bench. The test fixture sample assembly 50 includes a suspension fixing base frame 51 and an adjustable shock absorber mounting bracket 52. The adjustable shock absorber mounting bracket 52 is installed on one side of the suspension fixing base frame 51. The third part of the sample part 10 to be tested is connected to the top of the suspension fixing base frame 51. The control arm fixing plate 41 is installed on the suspension fixing base frame 51 and is located between the suspension fixing base frame 51 and the adjustable shock absorber mounting bracket 52.

[0067] According to the above structural description, the inertia stage spindle 20 and the electric cylinder loading assembly 30 constitute the drive part of the test. The braking test bench drive part (with universal joint) of the inertia stage spindle 20 can rotate forward to simulate service braking. The braking test bench drive part of the inertia stage spindle 20 can rotate backward to simulate reverse braking. The electric cylinder 31 in the electric cylinder loading assembly 30 can perform a reciprocating stroke, simulating the axial force of the steering tie rod in a real vehicle. The inertia stage spindle 20 is connected to the test sample part 10 with bolts and nuts. The electric cylinder loading assembly 30 is fixed to the test fixture electric cylinder fixing assembly 40 (test fixture electric cylinder fixing assembly) with bolts and nuts. The test sample part 10 and the test fixture electric cylinder fixing assembly 40 are fixedly connected with bolts and nuts. The MacPherson strut front suspension angle assembly braking test device can be used for conventional braking performance tests (wear test, brake noise test, brake vibration test, etc.), and can also be combined with the steering tie rod for joint tests to simulate the stress state of the tie rod when cornering and braking under real vehicle conditions.

[0068] The test method of the MacPherson front suspension assembly brake test device considers the following conditions:

[0069] Condition one: simulating steering condition in the driving process

[0070] The application also provides a test method of the MacPherson front suspension assembly brake test device, which adopts the MacPherson front suspension assembly brake test device as described above, when the test method examines the fatigue strength of the MacPherson front suspension brake angle assembly under the steering condition, the brake test bench only rotates at a constant speed, does not brake, the electric cylinder simulates the steering condition, and loads the fixed amplitude equal-amplitude alternating cyclic load or the random load simulating the road load spectrum.

[0071] Specific step S1: collecting the strain signal of the transverse pull rod through a strain gauge from a test field road test of an actual vehicle.

[0072] Step S2: in the fatigue strength test of the MacPherson front suspension and brake angle assembly, the road spectrum signal, i.e. the road simulation signal, of the steering transverse pull rod transmitted to the MacPherson front suspension and brake angle assembly in the actual driving of the vehicle is considered, and the signal is generally a force signal. The strain signal of step 1 is converted into a force signal through bench test calibration.

[0073] Step S3: after equivalent damage calculation of the force signal, the fixed amplitude equal-amplitude alternating cyclic load is converted, or the random load simulating the road load spectrum is formed through filtering, compression, splicing and other processing of the signal.

[0074] Step S4: using the electric cylinder, the force signal is iterated or equally loaded through the remote parameter control software or the signal loading control program, the driving signal is obtained to drive the electric cylinder to perform actions, so as to apply the load under the steering condition to the MacPherson front suspension brake angle assembly.

[0075] Step S5: while the load under the steering condition is applied to the MacPherson front suspension brake angle assembly in step S4, the brake test bench can be designed to rotate at a variable speed, but the whole process does not brake.

[0076] In this way, the MacPherson front suspension brake angle assembly 11 is tested according to the road simulation force signal, the real condition of the MacPherson front suspension brake angle assembly 11 is reproduced, and the stress condition of the MacPherson front suspension brake angle assembly 11 under the actual working state can be truly simulated.

[0077] Condition two: simulating the braking condition in the driving process

[0078] The application also provides a test method of the brake test device of the McPherson front suspension assembly, which adopts the brake test device of the McPherson front suspension assembly as described above.

[0079] The rotation speed signal, the temperature signal and the brake pressure signal of the brake disc in the McPherson front suspension brake angle assembly 11 are collected by the rotation speed sensor, the acceleration sensor, the temperature sensor and the pressure sensor while the force signal is collected, and the equivalent loading is implemented by the inertia platform main shaft 20.

[0080] Specific step S1: the rotation speed sensor, the acceleration sensor, the temperature sensor and the pressure sensor are carried during the brake working condition test on the test field road of an actual vehicle, and the rotation speed signal, the acceleration signal and the temperature signal of the brake disc in the McPherson front suspension brake angle assembly and the brake pressure signal in the brake pipeline under the brake working condition are collected.

[0081] Step S2: the effective rotation speed, acceleration, temperature and pressure signals are formed after the collected signals are processed by filtering, compression and splicing, and are used as the target signals arranged in the brake test platform.

[0082] Step S3: the rotation speed, acceleration, temperature and pressure parameters in step S2 are set by the remote parameter control software, and the equivalent loading is implemented by the inertia platform main shaft 20.

[0083] The test working condition of the McPherson front suspension brake angle assembly 11 on the inertia platform main shaft 20 is determined according to the rotation speed, acceleration, temperature and brake pressure collected according to the actual vehicle real working condition, so that the loading of the McPherson front suspension brake angle assembly 11 in the test process is highly consistent with the actual vehicle working condition.

[0084] Working condition three: simulate the brake steering working condition in the driving process

[0085] The application also provides a test method of the brake test device of the McPherson front suspension assembly, which adopts the brake test device of the McPherson front suspension assembly as described above.

[0086] Specific step S1: in the test field road of a real vehicle, strain gauges, speed sensors, acceleration sensors, temperature sensors and pressure sensors are loaded when the steering brake working condition test is carried out, and the force signal of the transverse pull rod 12, the speed signal of the brake disc, the temperature signal and the brake pressure signal are collected.

[0087] Step S2: the strain signal of step S1 is converted into a force signal through bench test calibration.

[0088] Step S3: after the collected signals are processed through filtering, compression and splicing, etc., an equal-amplitude alternating cyclic load is formed as the target signal of the electric cylinder 31;

[0089] Step S4: synchronizing with step S3, the collected speed, acceleration, temperature and brake pressure signals are used as the target signals of the brake test bench. The inertia bench main shaft 20 is tested in the front suspension corner assembly brake test device.

[0090] The output method and process of the electric cylinder 31 target signal are the same as working condition one, and the output method and process of the target signal used when the inertia bench main shaft 20 is tested are the same as working condition two, the difference lies in that the signal characteristics collected by the real vehicle are different, and the components used for implementing the load are different.

[0091] The MacPherson front suspension assembly brake test device and the test method thereof of the present application are designed in combination with the 1 / 4 front suspension brake assembly and the steering transverse pull rod test, which is closer to the system level brake performance in the real vehicle state. The present application simulates the real vehicle state, and the brake test performance test method under various working conditions is designed, and the appropriate tooling is used to realize it.

[0092] In summary, the MacPherson front suspension assembly brake test device and the test method thereof of the present application are designed in combination with the 1 / 4 front suspension brake assembly and the steering transverse pull rod test device, the real vehicle posture is designed when the device is designed, which is simple in design, convenient in manufacturing and easy to install.

[0093] The test method can not only separately examine the brake fatigue strength of the MacPherson front suspension corner assembly under the brake working condition, the fatigue strength of the MacPherson front suspension and the brake corner assembly under the steering working condition, but also examine the brake fatigue strength of the MacPherson front suspension corner assembly under the turning and emergency brake working condition. Moreover, the three can be alternately performed, which makes up for the present separate test, single working condition (combination of working condition one or working condition two) test state. Time and economic cost are saved, and the MacPherson front suspension and brake corner assembly brake test can be widely promoted.

[0094] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that these are merely illustrative, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and the essence of the present application, and such changes and modifications fall within the scope of protection of the present application.

Claims

1. A test method for a MacPherson strut front suspension assembly braking test device, characterized in that, The test method employs a MacPherson strut front suspension assembly braking test device, comprising a test sample, an inertia stage spindle, an electric cylinder loading assembly, a test fixture electric cylinder fixing assembly, and a test fixture sample assembly. The first end of the test sample is connected to the inertia stage spindle, the second end is connected to the electric cylinder loading assembly, and the third end is connected to the test fixture sample assembly. The test fixture electric cylinder fixing assembly is mounted on the test fixture sample assembly, and the electric cylinder loading assembly is fixed on the test fixture electric cylinder fixing assembly. The sample to be tested includes a MacPherson strut front suspension brake angle assembly, a tie rod, a lock nut, and a rod end bearing. One end of the tie rod is connected to the lower part of the MacPherson strut front suspension brake angle assembly, and one end of the rod end bearing is connected to the other end of the tie rod through the lock nut. The electric cylinder loading assembly includes an electric cylinder, an adapter rod, and a rod end bearing clamping block connected in sequence. The rod end bearing clamping block is connected to the other end of the rod end bearing via a connecting pin. The test fixture electric cylinder fixing assembly includes a control arm fixing plate, an electric cylinder stabilizer, pressure plate bolts, and actuator bolts. The electric cylinder stabilizer is fixed to the upper end of the control arm fixing plate by multiple pressure plate bolts, so that a mounting hole is formed between the electric cylinder stabilizer and the control arm fixing plate. The adapter rod passes through the mounting hole, and the electric cylinder is connected to the control arm fixing plate and the electric cylinder stabilizer through the actuator bolt; When the test method is used to assess the fatigue strength of the MacPherson strut front suspension brake angle assembly under steering conditions, the brake test bench rotates at a constant speed without braking conditions. The electric cylinder simulates the steering conditions and applies a fixed amplitude constant amplitude alternating cyclic load or a random load simulating the road load spectrum.

2. The test method of the MacPherson strut front suspension assembly braking test device as described in claim 1, characterized in that, The experimental method includes the following steps: S1. Strain signals of the transverse tie rod are collected using strain gauges during a road test of a real vehicle at a test track. S2. In the fatigue strength test of the MacPherson strut front suspension and brake angle assembly, the road spectrum signal transmitted by the steering tie rod to the MacPherson strut front suspension and brake angle assembly during actual vehicle driving is taken into account. This road simulation signal is generally a force signal. The strain signal in step S1 above is converted into a force signal through bench test calibration. S3. After performing equivalent damage calculation on the force signal, it is converted into a constant amplitude alternating cyclic load with a fixed amplitude, or a random load simulating a road load spectrum is formed by filtering, compressing and splicing the signal. S4. Using an electric cylinder, the force signal is iteratively or applied at a constant amplitude through remote parameter control software or signal loading control program to obtain a drive signal to drive the electric cylinder to perform an action, thereby applying a load under steering conditions to the MacPherson front suspension brake angle assembly. S5. While performing step S4 above to apply the steering load to the MacPherson front suspension brake angle assembly, the brake test bench is designed to rotate at a constant speed, but the braking condition is not applied throughout the process.

3. A test method for a MacPherson strut front suspension assembly braking test device, characterized in that, The test method employs a MacPherson strut front suspension assembly braking test device, comprising a test sample, an inertia stage spindle, an electric cylinder loading assembly, a test fixture electric cylinder fixing assembly, and a test fixture sample assembly. The first end of the test sample is connected to the inertia stage spindle, the second end is connected to the electric cylinder loading assembly, and the third end is connected to the test fixture sample assembly. The test fixture electric cylinder fixing assembly is mounted on the test fixture sample assembly, and the electric cylinder loading assembly is fixed on the test fixture electric cylinder fixing assembly. The sample to be tested includes a MacPherson strut front suspension brake angle assembly, a tie rod, a lock nut, and a rod end bearing. One end of the tie rod is connected to the lower part of the MacPherson strut front suspension brake angle assembly, and one end of the rod end bearing is connected to the other end of the tie rod through the lock nut. The electric cylinder loading assembly includes an electric cylinder, an adapter rod, and a rod end bearing clamping block connected in sequence. The rod end bearing clamping block is connected to the other end of the rod end bearing via a connecting pin. The test fixture electric cylinder fixing assembly includes a control arm fixing plate, an electric cylinder stabilizer, pressure plate bolts, and actuator bolts. The electric cylinder stabilizer is fixed to the upper end of the control arm fixing plate by multiple pressure plate bolts, so that a mounting hole is formed between the electric cylinder stabilizer and the control arm fixing plate. The adapter rod passes through the mounting hole, and the electric cylinder is connected to the control arm fixing plate and the electric cylinder stabilizer through the actuator bolt; When the test method is used to assess the braking fatigue strength of the MacPherson strut front suspension assembly under braking conditions, only the brake test bench is used. The test bench continuously or in single braking under different rotation directions, temperatures, speeds, decelerations, or braking pressures to assess the braking performance under different temperatures, speeds, and braking pressures.

4. The test method for the MacPherson strut front suspension assembly braking test device as described in claim 3, characterized in that, The experimental method includes the following steps: S1. When conducting braking condition tests on a test track of a real vehicle, a speed sensor, an acceleration sensor, a temperature sensor, and a pressure sensor are installed to collect the speed signal, acceleration signal, and temperature signal of the brake disc in the MacPherson front suspension brake angle assembly, as well as the brake pressure signal in the brake line under braking conditions. S2. After filtering, compressing and splicing the collected signals, effective speed, acceleration, temperature and pressure signals are formed, which are used as the target signals set in the braking test bench. S3. Set the rotational speed, acceleration, temperature and pressure parameters in step S2 using remote parameter control software, and implement equivalent loading through the spindle of the inertia stage.

5. A test method for a MacPherson strut front suspension assembly braking test device, characterized in that, The test method employs a MacPherson strut front suspension assembly braking test device, comprising a test sample, an inertia stage spindle, an electric cylinder loading assembly, a test fixture electric cylinder fixing assembly, and a test fixture sample assembly. The first end of the test sample is connected to the inertia stage spindle, the second end is connected to the electric cylinder loading assembly, and the third end is connected to the test fixture sample assembly. The test fixture electric cylinder fixing assembly is mounted on the test fixture sample assembly, and the electric cylinder loading assembly is fixed on the test fixture electric cylinder fixing assembly. The sample to be tested includes a MacPherson strut front suspension brake angle assembly, a tie rod, a lock nut, and a rod end bearing. One end of the tie rod is connected to the lower part of the MacPherson strut front suspension brake angle assembly, and one end of the rod end bearing is connected to the other end of the tie rod through the lock nut. The electric cylinder loading assembly includes an electric cylinder, an adapter rod, and a rod end bearing clamping block connected in sequence. The rod end bearing clamping block is connected to the other end of the rod end bearing via a connecting pin. The test fixture electric cylinder fixing assembly includes a control arm fixing plate, an electric cylinder stabilizer, pressure plate bolts, and actuator bolts. The electric cylinder stabilizer is fixed to the upper end of the control arm fixing plate by multiple pressure plate bolts, so that a mounting hole is formed between the electric cylinder stabilizer and the control arm fixing plate. The adapter rod passes through the mounting hole, and the electric cylinder is connected to the control arm fixing plate and the electric cylinder stabilizer through the actuator bolt; When the test method is used to assess the braking fatigue strength of the MacPherson strut front suspension assembly under turning and emergency braking conditions, it combines multiple low-speed turns and a few high-speed turns, along with different temperatures and multiple combinations of braking pressures to simulate braking conditions, and uses an electric cylinder to simulate steering conditions, applying a constant amplitude alternating cyclic load.

6. The test method for the MacPherson strut front suspension assembly braking test device as described in claim 5, characterized in that, The experimental method includes the following steps: S1. When conducting steering and braking tests on a test track of a real vehicle, strain gauges, speed sensors, acceleration sensors, temperature sensors, and pressure sensors are installed to collect force signals from the lateral tie rod, speed signals from the brake disc, temperature signals, and braking pressure signals. S2. The strain signal from step S1 above is converted into a force signal through bench testing and calibration. S3. After filtering, compressing and splicing the collected signals, a constant amplitude alternating cyclic load is formed, which serves as the target signal applied by the electric cylinder. S4. Synchronize with the above step S3, and use the collected speed, acceleration, temperature and braking pressure signals as target signals for the braking test bench, and perform the test on the inertia stage spindle in the MacPherson strut front suspension angle assembly braking test device.

7. The test method for the MacPherson strut front suspension assembly braking test device as described in claim 1, 3, or 5, characterized in that, The inertia stage spindle includes a brake test bench drive unit, a coupling, and a bolt and nut connection mechanism. One end of the coupling is connected to the universal joint of the brake test bench drive unit through the bolt and nut connection mechanism.

8. The test method for the MacPherson strut front suspension assembly braking test device as described in claim 1, 3, or 5, characterized in that, The test fixture sample assembly includes a suspension fixing base frame and an adjustable shock absorber mounting bracket. The adjustable shock absorber mounting bracket is installed on one side of the suspension fixing base frame. The third part of the sample to be tested is connected to the top of the suspension fixing base frame. The control arm fixing plate is installed on the suspension fixing base frame and located between the suspension fixing base frame and the adjustable shock absorber mounting bracket.

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