Dynamic performance testing device for mechanical resonance type vehicle suspension

Abstract

The utility model discloses a mechanical resonance type vehicle suspension dynamic performance testing device which comprises a mechanical excitation device, a wheel fixing device and a bottom plate, the mechanical excitation device is installed on the bottom plate and generates displacement excitation, and the wheel fixing device is installed on the mechanical excitation device and fixes vehicle wheels. Displacement excitation generated by the mechanical excitation device acts on vehicle wheels through the wheel fixing device, and displacement excitation is generated on a vehicle suspension. The mechanical shock excitation device is reasonable in structural design, the mechanical shock excitation device adopts an inner and outer eccentric wheel structure and has the characteristics of large load, adjustable amplitude and frequency and compact structure, and the wheel fixing device is simple in structure, reliable in fixation, lower in manufacturing cost, simple to maintain and convenient to arrange and use in a production field.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle dynamic performance test technical field especially relates to mechanical resonance type vehicle suspension dynamic performance testing device. BACKGROUND

[0002] Suspension is the key component of supporting vehicle and realizing damping, directly influences the ride comfort, the control stability and the safety of vehicle. Suspension is mainly composed of three core components of elastic element, guiding device and shock absorber. Among them, stiffness, damping ratio, natural frequency and other parameters are the key to affect the dynamic performance of suspension, and appropriate dynamic performance parameters can improve the comfort and dynamic response ability of vehicle, relieve the impact caused by uneven road, especially in bad road conditions, can effectively reduce the body vibration, ensure the smoothness and stability of automobile running, improve the transportation safety. Therefore, the dynamic performance parameters of vehicle suspension need to be accurately designed and measured. According to the different excitation modes, the suspension dynamic performance measurement system can be divided into four kinds of pressing type, drop type, flat plate braking type and resonance type. Among them, the resonance type is the most widely used, and is more suitable for heavy trucks. The vibration table is used to apply a certain frequency and amplitude of excitation displacement to the wheel, and the response of the suspension system is measured to determine the resonance frequency and resonance amplitude. Through the analysis of resonance test data, the dynamic performance of suspension is evaluated.

[0003] The excitation device can be divided into mechanical type, hydraulic type and electric type. The electric type vibration table is suitable for laboratory and research and development stage due to its high precision and flexibility. The hydraulic type vibration table is used in industry requiring large load. The mechanical type vibration table is usually used in low frequency and small amplitude, which is consistent with the characteristics of truck. However, the load of traditional mechanical type vibration table is not large enough, and the service life is not long enough. Therefore, the mechanical resonance type vehicle suspension dynamic performance testing device is designed to solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model discloses a mechanical resonance type vehicle suspension dynamic performance testing device, which adopts inner and outer eccentric wheel structure for the mechanical excitation device, has the characteristics of large load, adjustable amplitude and frequency, compact structure, simple structure and reliable fixation of wheel fixing device, low manufacturing cost, simple maintenance, and convenient production site arrangement and use.

[0005] In order to realize the above purpose, the utility model adopts the following technical scheme:

[0006] The mechanical resonance type vehicle suspension dynamic performance testing device comprises a mechanical exciting device, a wheel fixing device and a bottom plate, the mechanical exciting device is installed on the bottom plate to generate displacement excitation, the wheel fixing device is installed on the mechanical exciting device to fix the vehicle wheel, and the displacement excitation generated by the mechanical exciting device acts on the vehicle wheel through the wheel fixing device to generate displacement excitation on the vehicle suspension.

[0007] Preferably, the mechanical exciting device comprises a box body, four linear bearings, a transmission shaft, a pair of rolling bearings, an inner eccentric wheel, an outer eccentric wheel and a tension sleeve, the transmission shaft is installed on the box body through the pair of rolling bearings, the inner eccentric wheel and the outer eccentric wheel are fixed by the tension sleeve and are connected to the middle part of the transmission shaft through a key.

[0008] Preferably, the four linear bearings are fixedly installed on the top of the box body.

[0009] Preferably, the transmission shaft is driven to rotate by a variable frequency motor.

[0010] Preferably, the wheel fixing device comprises four guide columns installed on a mounting plate, an excitation boss, a wedge fixing assembly and a transverse clamping assembly, the excitation boss is installed on the bottom of the mounting plate and is opposite to the outer eccentric wheel, the excitation boss drives the wheel fixing device to reciprocate up and down under the pushing of the outer eccentric wheel to realize displacement excitation on the vehicle wheel.

[0011] Preferably, the four guide columns are installed on the bottom of the mounting plate, and the four guide columns extend into the four linear bearings respectively and cooperate with the linear bearings to ensure the stability of movement.

[0012] Preferably, the wedge fixing assembly and the transverse clamping assembly are installed above the mounting plate, the wedge fixing assembly clamps four corners of the vehicle tire, the transverse clamping assembly clamps the side surface of the vehicle tire, and the wedge fixing assembly and the transverse clamping assembly are both driven by a gas cylinder.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1. The utility model can directly place the vehicle on the mounting plate without disassembling the vehicle chassis, fix the vehicle wheel through the wheel fixing device, generate displacement excitation through the mechanical exciting device, act on the vehicle wheel through the wheel fixing device, and realize the testing of the dynamic performance of the vehicle suspension, thereby laying a foundation for the development and modification of the vehicle.

[0015] 2. The utility model adopts the inner and outer eccentric wheel structure, can significantly improve the efficiency of the dynamic performance measurement of the vehicle, is convenient to adjust the excitation amplitude and frequency, has compact overall structure, low cost and wide applicability. DRAWINGS

[0016] Figure 1 The structural schematic diagram of the mechanical resonance type vehicle suspension dynamic performance testing device is provided in the utility model.

[0017] Figure 2 The structural schematic diagram of the mechanical resonance type vehicle suspension dynamic performance testing device is provided in the utility model.

[0018] Figure 3 The structural schematic diagram of the mechanical resonance type vehicle suspension dynamic performance testing device is provided in the utility model.

[0019] Figure 4 The structural schematic diagram of the mechanical resonance type vehicle suspension dynamic performance testing device is provided in the utility model.

[0020] In the figure: 1, mechanical excitation device; 11, box; 12, linear bearing; 13, transmission shaft; 14, rolling bearing; 15, inner eccentric wheel; 16, outer eccentric wheel; 17, expansion sleeve; 2, wheel fixing device; 3, bottom plate; 21, mounting plate; 22, guide column; 23, excitation boss; 24, wedge-shaped fixing assembly; 25, transverse clamping assembly. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0022] Referring to Figures 1-4 , the mechanical resonance type vehicle suspension dynamic performance testing device comprises a mechanical excitation device 1, a wheel fixing device 2 and a bottom plate 3, the mechanical excitation device 1 is installed on the bottom plate 3 to generate displacement excitation, referring to Figure 2 and Figure 4 , the mechanical excitation device 1 comprises a box 11, four linear bearings 12, a transmission shaft 13, a pair of rolling bearings 14, an inner eccentric wheel 15, an outer eccentric wheel 16 and an expansion sleeve 17, the transmission shaft 13 is installed on the box 11 through the pair of rolling bearings 14, the box 11 is provided with a cavity, the pair of rolling bearings 14 are respectively installed on the front and rear sides of the box 11, so that the transmission shaft 13 can be installed on the box 11 in a front-to-back penetrating mode, the inner eccentric wheel 15 and the outer eccentric wheel 16 are fixed by the expansion sleeve 17 and are connected to the middle part of the transmission shaft 13 through a key, the inner eccentric wheel 15, the outer eccentric wheel 16 and the expansion sleeve 17 are located inside the box 11, the transmission shaft 13 is driven to rotate by a variable frequency motor, and then the transmission shaft 13 can drive the inner eccentric wheel 15 and the outer eccentric wheel 16 to rotate, the four linear bearings 12 are fixedly installed on the top of the box 11, and the four linear bearings 12 are distributed in a cross shape;

[0023] With reference to Figure 1 And Figure 3 The wheel fixing device 2 is installed on the mechanical excitation device 1 and fixes the vehicle wheel, and the wheel fixing device 2 comprises four guide columns 22, an excitation boss 23, a wedge-shaped fixing assembly 24 and a transverse clamping assembly 25 installed on the mounting plate 21, the excitation boss 23 is installed at the bottom of the mounting plate 21 and opposite to the outer eccentric wheel 16, the upper end of the box body 11 is provided with a through opening, the excitation boss 23 extends into the box body 11 through the through opening and is opposite to the outer eccentric wheel 16, when the outer eccentric wheel 16 rotates, the excitation boss 23 can be pushed to reciprocatingly move up and down, and then the excitation boss 23 can drive the wheel fixing device 2 to reciprocatingly move up and down under the pushing of the outer eccentric wheel 16, so that displacement excitation of the vehicle wheel is realized.

[0024] The four guide columns 22 are installed at the bottom of the mounting plate 21, the four guide columns 22 extend into the four linear bearings 12 respectively, and cooperate with the linear bearings 12, so that the mounting plate 21 can only move up and down, thereby ensuring the stability of movement.

[0025] The wedge-shaped fixing assembly 24 and the transverse clamping assembly 25 are installed above the mounting plate 21, the wedge-shaped fixing assembly 24 clamps four corners of the vehicle tire, and the transverse clamping assembly 25 clamps the side surface of the vehicle tire, so as to prevent the vehicle tire from falling off, the wedge-shaped fixing assembly 24 and the transverse clamping assembly 25 are both driven by air cylinders, the wedge-shaped fixing assembly 24 is composed of four groups of air cylinders and wedge-shaped blocks and is located at four corners of the mounting plate 21, the air cylinders drive the corresponding wedge-shaped blocks to move, so that the wedge-shaped blocks can clamp the vehicle tire, so that the wedge-shaped fixing assembly 24 clamps four corners of the vehicle tire, the transverse clamping assembly 25 is composed of two groups of clamping blocks and air cylinders arranged in front and back, the two air cylinders drive the corresponding clamping blocks to move, so that the two clamping blocks can move close to each other and clamp the front and back sides of the vehicle tire, so that the transverse clamping assembly 25 clamps the side surface of the vehicle tire.

[0026] The displacement excitation generated by the mechanical excitation device 1 acts on the vehicle wheel through the wheel fixing device 2, so as to generate displacement excitation of the vehicle suspension, after the wheel fixing device 2 fixes the vehicle wheel, the variable frequency motor drives the transmission shaft 13 to rotate, so that the outer eccentric wheel 16 rotates and pushes the excitation boss 23 to reciprocatingly move up and down, thereby driving the wheel fixing device 2 to reciprocatingly move up and down, so as to act on the vehicle wheel and generate displacement excitation of the vehicle suspension.

[0027] The utility model can be described by the following operation mode to explain its function principle:

[0028] Suppose that a truck chassis needs to be refitted into an oil tank truck, the chassis is provided by a main engine factory, and the dynamic performance parameters are not very detailed, therefore, the dynamic performance parameters of the chassis need to be tested and matched with the overall performance of the oil tank truck.

[0029] (1) Adjust the relative position of the inner eccentric wheel 15 and the outer eccentric wheel 16 according to the measurement excitation demand, ensure that the excitation displacement amplitude meets the requirements, and use the expansion sleeve 17 to fix, specifically, ensure that the excitation displacement amplitude is 15mm;

[0030] (2) Drive the vehicle to the test device, drive the truck chassis to the test area, and align the measured wheel with the middle part of the mounting plate 21 on the wheel fixing device 2;

[0031] (3) Control the air cylinder of the wedge-shaped fixing assembly 24 and the transverse clamping assembly 25, so that the wedge-shaped fixing assembly 24 and the transverse clamping assembly 25 clamp the four corners and the side of the vehicle tire respectively, to prevent falling off;

[0032] (4) Adjust the motor speed according to the frequency demand of the measurement excitation, ensure that the excitation displacement frequency meets the requirements, specifically, sweep excitation from 120r / min to 1200r / min;

[0033] (5) Start the variable frequency motor to drive the transmission shaft 13 to rotate, start the measurement, record the change rule of displacement and force with time, and then calculate the dynamic performance parameters such as stiffness, damping ratio and natural frequency of the corresponding suspension.

[0034] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A mechanical resonance type vehicle suspension dynamic performance testing device comprising a mechanical excitation device (1), a wheel fixing device (2) and a base plate (3), characterized in that, The mechanical vibration device (1) is installed on the bottom plate (3) to generate displacement excitation, the wheel fixing device (2) is installed on the mechanical vibration device (1) to fix the vehicle wheel, and the displacement excitation generated by the mechanical vibration device (1) acts on the vehicle wheel through the wheel fixing device (2) to generate displacement excitation on the vehicle suspension.

2. The mechanical resonant vehicle suspension dynamic performance test device of claim 1, wherein, The mechanical vibration device (1) comprises a box (11), four linear bearings (12), a transmission shaft (13), a pair of rolling bearings (14), an inner eccentric wheel (15), an outer eccentric wheel (16) and a tension sleeve (17), the transmission shaft (13) is installed on the box (11) through the pair of rolling bearings (14), the inner eccentric wheel (15) and the outer eccentric wheel (16) are fixed by the tension sleeve (17) and are connected to the middle part of the transmission shaft (13) through a key.

3. The mechanical resonant vehicle suspension dynamic performance test device of claim 2, wherein, Four linear bearings (12) are fixedly installed on the top of the box (11).

4. The mechanical resonant vehicle suspension dynamic performance test device of claim 2, wherein, The transmission shaft (13) is driven to rotate by a variable frequency motor.

5. The mechanical resonant vehicle suspension dynamic performance test device of claim 3, wherein, The wheel fixing device (2) comprises four guide columns (22), an excitation boss (23), a wedge fixing assembly (24) and a transverse clamping assembly (25) installed on the mounting plate (21), the excitation boss (23) is installed on the bottom of the mounting plate (21) and opposite to the outer eccentric wheel (16), the excitation boss (23) drives the wheel fixing device (2) to reciprocate up and down under the push of the outer eccentric wheel (16), so as to realize displacement excitation on the wheel.

6. The mechanical resonant vehicle suspension dynamic performance test device of claim 5, wherein, Four guide columns (22) are installed on the bottom of the mounting plate (21), and four guide columns (22) extend into four linear bearings (12) respectively, cooperate with the linear bearings (12) and ensure the stability of movement.

7. The mechanical resonant vehicle suspension dynamic performance test device of claim 5, wherein, The wedge fixing assembly (24) and the transverse clamping assembly (25) are installed above the mounting plate (21), the wedge fixing assembly (24) clamps four corners of the vehicle tire, the transverse clamping assembly (25) clamps the side of the vehicle tire, and the wedge fixing assembly (24) and the transverse clamping assembly (25) are driven by a gas cylinder.

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