Electric drive device for shock absorber test

Abstract

The utility model relates to the technical field of automobile part test equipment, and specifically discloses an electric drive device used for a shock absorber test. Comprising a bottom plate, a linear motor, a displacement sensor and an executing mechanism, the executing mechanism comprises a fixing base, a guide shaft and a tool strip, a stator of the linear motor is arranged on the bottom plate, a rotor of the linear motor is connected with the fixing base and used for driving the fixing base to slide in the vertical direction, the guide shaft is vertically arranged on the fixing base, and the tool strip is arranged at the top of the guide shaft. According to the electric drive device for the shock absorber test, the problems of aging abrasion and oil leakage of hydraulic drive of a conventional shock absorber test bench and the problems of large amplitude detection error and motion lag of electric crank connecting rod drive are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive parts testing equipment, specifically to an electric drive device for shock absorber testing. Background Technology

[0002] During the research and manufacturing process of automotive shock absorbers, it is necessary to test their performance. During testing, the shock absorber needs to be installed on a test bench, and then the test bench is used to apply reciprocating tensile and compressive forces to the shock absorber to simulate the impact force on the shock absorber when the car is driving. Then, the vibration amplitude and loading force of the shock absorber are analyzed to verify its performance.

[0003] Current shock absorber test benches mainly use two power sources: hydraulic drive and electric crank-connecting rod. Hydraulic drive relies on hydraulic oil to transmit force. Although it has strong power, the seals are prone to aging and wear, posing a risk of oil leakage. Leaking hydraulic oil can contaminate the test bench surface and interfere with data. Secondly, hydraulic drive systems have many components, making installation and debugging difficult, maintenance costs high, and operating oil consumption large, resulting in high overall costs.

[0004] The electric crank-connecting rod power source uses a motor to drive the crank in circular motion, which is then converted into linear reciprocating motion via the connecting rod. However, the crank-connecting rod mechanism has backlash, resulting in large amplitude errors during testing. Furthermore, the heavy weight of the intermediate mechanism generates a large moment of inertia during testing, making the starting and stopping of the moving structure inflexible. It also induces elastic deformation and backlash, causing motion lag and noise during operation, failing to meet the high-speed performance requirements of shock absorber indicator tests. Utility Model Content

[0005] The present invention aims to provide an electric drive device for shock absorber testing, in order to solve the problems of aging, wear and oil leakage in the hydraulic drive of the current shock absorber test bench, and the problems of large amplitude detection error and motion lag in the electric crank connecting rod drive.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an electric drive device for shock absorber testing, comprising a base plate, a linear motor, a displacement sensor, and an actuator. The actuator comprises a fixed base, a guide shaft, and a tooling strip. The stator of the linear motor is mounted on the base plate, and the mover is connected to the fixed base and used to drive the fixed base to slide vertically. The guide shaft is vertically mounted on the fixed base, and the tooling strip is mounted on the top of the guide shaft.

[0007] The beneficial effects of this plan are:

[0008] In this design, a linear motor drives the fixed base to slide, which in turn drives the tooling strip to slide via a guide shaft, providing power for the linear motion of the shock absorber. Compared to hydraulic drive methods, this design does not use hydraulic oil, thus eliminating the risk of hydraulic oil leakage. Compared to electric crank-connecting rod drive methods, because the linear motor directly drives the tooling strip to slide linearly without converting circular motion into linear motion, this design eliminates the need for structures requiring rotational motion, such as crank-connecting rods. This results in smaller gaps between moving parts and less vibration generated during operation, leading to more accurate testing of the shock absorber's vibration amplitude and significantly improved detection precision. Furthermore, by omitting structures requiring rotational motion, the overall structure of this design is simpler and its operation more reliable.

[0009] Secondly, the linear motor's mover is supported by magnetic levitation, thus maintaining a certain air gap between the mover and stator without direct contact. This eliminates frictional resistance, resulting in better sensitivity and responsiveness of the electric drive system, and faster reaction time, further improving detection accuracy. Furthermore, the absence of friction between the mover and stator minimizes mechanical losses during linear motor operation, leading to fewer malfunctions in the electric drive system, effectively reducing maintenance costs. This also extends the lifespan of the test bench and ensures safe and reliable operation.

[0010] Furthermore, the actuator also includes a cylinder that extends vertically through the fixed seat, and the fixed seat slides in conjunction with the cylinder housing; the piston rod of the cylinder faces upward and is connected to the tooling strip.

[0011] The beneficial effects of this solution are as follows: the cylinder in the solution is not used as a power source, but as a buffer device to provide support for the tooling strip during testing, ensuring that the initial operating load of the linear motor is zero at the start of the test, which can improve the accuracy of the test.

[0012] Furthermore, the cylinder is connected to an overflow valve.

[0013] The beneficial effects of this solution are as follows: Firstly, the overflow valve allows for timely discharge of gas from the cylinder when the internal pressure is excessive, thus maintaining the cylinder pressure within a preset range throughout the testing process and preventing interference with the movement of the tooling strip. Secondly, the cylinder acts as a buffer during testing, reducing vibration of the entire test bench and preventing errors in vibration analysis of the damper caused by significant bench vibration, thereby further improving testing accuracy.

[0014] Furthermore, the cylinder is also connected to an air tank.

[0015] The beneficial effects of this solution are: the gas tank is used to store gas, and the distance between the gas tank and the cylinder is smaller, so when gas needs to be introduced into the cylinder, the gas can be introduced into the cylinder more quickly, and the response is more timely.

[0016] Furthermore, a pressure sensor is installed in the air circuit where the cylinder is located to detect the pressure inside the air circuit.

[0017] The beneficial effects of this solution are: the pressure sensor can provide timely feedback on the air pressure in the air circuit where the cylinder is located, so that it can detect when the air pressure in the cylinder is lower or higher than the preset value.

[0018] Furthermore, a sliding bearing is provided between the cylinder and the fixed base.

[0019] The beneficial effect of this solution is that the sliding bearing guides the sliding of the fixed seat.

[0020] Furthermore, multiple linear motors are provided, and all linear motors are symmetrically distributed on the sides of the fixed base.

[0021] The beneficial effects of this solution are: the linear motor in this solution can provide basically the same thrust to both sides of the fixed seat, further ensuring that the fixed seat is subjected to uniform force and slides in the vertical direction.

[0022] Furthermore, a worktable is provided above the base plate, and a housing is provided on the base plate. The worktable is installed on the housing, and the base plate, housing and worktable form an installation cavity. A linear motor is located in the installation cavity, a tooling strip is located above the worktable, and a guide shaft passes through the worktable vertically and slides with the worktable.

[0023] Furthermore, the mounting cavity is connected to a cooling mechanism.

[0024] The beneficial effects of this solution are: the cooling mechanism can cool down structures such as linear motors, ensuring that linear motors can run for a longer period of time.

[0025] Furthermore, there are two guide shafts, and the upper ends of both guide shafts are connected to the tooling strip.

[0026] The beneficial effects of this solution are: the two guide shafts can position the tooling strip and prevent it from twisting. Attached Figure Description

[0027] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0028] Figure 2 for Figure 1 A three-dimensional view of the motor and actuator. Detailed Implementation

[0029] The following detailed description illustrates the specific implementation method:

[0030] The reference numerals in the accompanying drawings include: base plate 1, air tank 11, displacement sensor 12, housing 13, cylinder 2, sliding bearing 21, linear motor base 3, stator 31, mover 32, fixed seat 4, guide shaft 41, worktable 5, tooling strip 6, cabinet air conditioner 7.

[0031] Example

[0032] The implementation examples are basically as follows Figure 1 and Figure 2 As shown, the electric drive device for shock absorber testing includes a base plate 1, a linear motor, a displacement sensor 12, a cylinder 2, and an actuator. A sheet metal housing 13 is mounted on the base plate 1 by screws. A worktable 5 is mounted on the top of the housing 13, forming a mounting cavity between the base plate 1, the worktable 5, and the housing 13. A cooling mechanism is installed inside the mounting cavity. In this embodiment, the cooling mechanism uses an existing cabinet air conditioner 7 to cool the equipment inside the mounting cavity.

[0033] The actuator includes a fixed base 4, a guide shaft 41, and a tooling strip 6. Six linear motors are provided. The fixed base 4 and all the linear motors are located within the mounting cavity. The six linear motors are evenly divided into two groups, one group located on the left side of the fixed base 4 and the other group on the right side, with each group of linear motors corresponding to the others. Each linear motor includes a linear motor base 3, a mover 32, and a stator 31. Specifically, this embodiment uses existing linear motors, and their specific structure will not be described in detail here. The stators 31 are mounted back-to-back on the linear motor base 3, which is mounted on the base plate 1. The movers 32 are all connected to the fixed base 4 and simultaneously drive the fixed base 4 to slide vertically. The displacement sensor 12 is mounted on the linear motor base 3 and faces the fixed base 4.

[0034] Two guide shafts 41 are provided, with their lower ends located within the mounting cavity and their upper ends penetrating the worktable 5 and extending above it. The lower ends of the guide shafts 41 are mounted on the fixed seat 4 and slide synchronously vertically with the fixed seat 4. The outer shell 13 of the cylinder 2 is located within the mounting cavity. The two guide shafts 41 are located on the front and rear sides of the cylinder 2, respectively, and the bottom of the cylinder 2 is mounted on the base plate 1. The outer shell 13 of the cylinder 2 penetrates vertically through the fixed seat 4, and the fixed seat 4 slides in conjunction with the cylinder 2. The piston rod of the cylinder 2 faces upward and penetrates vertically through the worktable 5. In this embodiment, sliding bearings 21 are provided between the guide shafts 41 and the worktable 5, and between the outer shell 13 of the cylinder 2 and the fixed seat 4. The tooling strip 6 is located above the worktable 5, and the tops of the piston rod and the guide shafts 41 are connected to the tooling strip 6. The cylinder 2 is connected to an air tank 11 and an overflow valve, and a pressure sensor is provided in the air path of the cylinder 2 to detect the air pressure in the air path.

[0035] The specific implementation process is as follows:

[0036] Adjust the preset value of the air pressure inside cylinder 2 until, in the initial state when the linear motor is not running, the force provided by cylinder 2 to tooling strip 6 just neutralizes the gravity of the actuator, thereby ensuring that the initial load of the linear motor is zero when it is running.

[0037] During testing, the linear motor is activated, which drives the shock absorber to move up and down repeatedly. In this embodiment, the combined thrust of the six linear motors enables the load to reach 25KN, the corresponding frequency to reach 100HZ, and the maximum speed to reach 4m / s.

[0038] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An electric drive device for shock absorber testing, characterized in that: The device includes a base plate, a linear motor, a displacement sensor, and an actuator. The actuator includes a fixed base, a guide shaft, and a tooling strip. The stator of the linear motor is mounted on the base plate, and the mover is connected to the fixed base and used to drive the fixed base to slide vertically. The guide shaft is vertically mounted on the fixed base, and the tooling strip is located on top of the guide shaft.

2. The electric drive device for shock absorber testing according to claim 1, characterized in that: The actuator also includes a cylinder that extends vertically through a fixed seat, and the fixed seat is slidably fitted with the cylinder housing; the piston rod of the cylinder faces upward and is connected to a tooling strip.

3. The electric drive device for shock absorber testing according to claim 2, characterized in that: The cylinder is connected to an overflow valve.

4. The electric drive device for shock absorber testing according to claim 3, characterized in that: The cylinder is also connected to an air tank.

5. The electric drive device for shock absorber testing according to claim 4, characterized in that: The cylinder is equipped with a pressure sensor in the air circuit to detect the pressure inside the air circuit.

6. The electric drive device for shock absorber testing according to claim 2, characterized in that: A sliding bearing is provided between the cylinder and the fixed base.

7. The electric drive device for shock absorber testing according to claim 1, characterized in that: There are multiple linear motors, and all of them are symmetrically distributed on the side of the fixed base.

8. The electric drive device for shock absorber testing according to claim 1, characterized in that: A worktable is provided above the base plate, and a housing is provided on the base plate. The worktable is installed on the housing, and the base plate, housing and worktable form a mounting cavity. The linear motor is located in the mounting cavity, the tooling strip is located above the worktable, and the guide shaft passes through the worktable vertically and slides with the worktable.

9. The electric drive device for shock absorber testing according to claim 8, characterized in that: The mounting cavity is connected to a cooling mechanism.

10. The electric drive device for shock absorber testing according to claim 8, characterized in that: There are two guide shafts, and the upper ends of both guide shafts are connected to the tooling strip.

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