Pedal performance detection equipment

Abstract

The utility model discloses pedal performance detection equipment, which comprises a base, an environmental box and a rack, the environmental box and the rack are fixed on the base, a sample piece mounting table is arranged in the environmental box, and a loading mechanism is arranged on the rack; the loading mechanism structurally comprises a bracket, an electric cylinder, a connecting seat, a guide rod, a longitudinal displacement sensor, a pressure sensor, a loading rod and a pedal piece clamping jaw; the loading mechanism is used for applying force to a test sample piece; the performance detection of the pedal is completed in the environment box, and the temperature and humidity loss cannot be caused in the test process; a sensor for testing is arranged outside the environment box, and the sensor is not in contact with an extreme environment in the whole detection process, so that the problem of distortion of the sensor due to high and low temperatures is avoided; according to the utility model, the accuracy of the test and the credibility of data are improved, and the device is suitable for wide popularization.

Description

A pedal performance testing device Technical Field

[0001] This utility model belongs to the field of automotive pedal testing, and in particular, it is a pedal performance testing device. Background Technology

[0002] Automotive pedals are categorized into brake pedals, clutch pedals, and accelerator pedals. Pedal performance testing is the most fundamental test for pedal products, and as a crucial safety component of a car, the performance of the pedal directly impacts driving safety. In real-vehicle simulations, it's essential to simulate not only the force-displacement relationship of the pedal but also the external environment. Based on pedal performance testing requirements, current methods for determining pedal performance can be broadly categorized into two types: 1) Environment-first, performance-second: The pedal is first placed in an environmental chamber for preheating until it reaches the required testing temperature, then quickly removed and installed on a performance testing bench for force-displacement relationship testing; 2) Walk-in environmental performance: A conventional environmental chamber is modified into a walk-in environmental chamber, and the performance testing bench is installed inside to meet the requirements for testing pedal performance under high and low temperatures. 3) Both types of testing equipment have certain drawbacks: In the environmental testing method, where the sample is removed from the environmental chamber and then installed on the performance testing bench until the test begins, rapid heat exchange occurs between the sample and the external environment. During the actual performance test, due to temperature and humidity losses, the actual temperature and humidity conditions will inevitably fail to meet the standard requirements. In the walk-in environmental performance testing method, all sensors on the performance testing bench are exposed inside the environmental chamber. Extreme high and low temperatures can cause sensor distortion, affecting the accuracy and stability of the sensors. Summary of the Invention

[0003] This invention proposes a pedal performance testing device, which aims to avoid the drawbacks of existing testing equipment, make the testing method more in line with standards, and improve the accuracy of the test.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a pedal performance testing device, including a base and an environmental chamber and a frame fixed on the base. The environmental chamber is provided with a sample mounting platform, and the frame is provided with a loading mechanism; characterized in that: the structure of the loading mechanism includes a bracket, an electric cylinder, a connecting seat, a guide rod, a longitudinal displacement sensor, a pressure sensor, a loading rod, a pedal clamp, the electric cylinder being fixed on the bracket, the piston rod of the electric cylinder passing through the connecting seat and being fixedly connected to the connecting seat, one end of the guide rod being fixedly connected to the connecting seat, and the other end of the guide rod being slidably connected to a guide hole on the bracket, the longitudinal displacement sensor being fixed on the bracket, the detection end of the longitudinal displacement sensor being connected to the connecting seat, the pressure sensor being fixed on the connecting seat, one end of the loading rod being connected to the pressure sensor, and the other end of the loading rod being connected to the pedal clamp.

[0005] Further defining the above technical solution, the structure of the pedal clip claw includes a clamping seat, a hinge hole at the upper end of the clamping seat, horizontal screws on the left and right sides of the lower end of the clamping seat, a slider and a slider limiting nut on each screw, an upper boss bent inward at the upper end of the slider, a pedal clip clamping bolt at the upper boss, and a lower boss bent inward at the lower end of the slider, the lower boss being used for pedal clip limiting.

[0006] Further defining the above technical solution, the base is provided with a sliding bracket, and a pull rope displacement sensor is fixed on the sliding bracket. The rope of the pull rope displacement sensor is guided by a guide wheel fixed on the sliding bracket, and the rope of the pull rope displacement sensor is connected to the pedal plate of the sample by magnetic attraction or adhesive.

[0007] Beneficial effects: The performance testing of the pedal is completed inside the environmental chamber, and there is no loss of temperature and humidity during the test; the sensor used for the test is set outside the environmental chamber, and the sensor does not come into contact with the extreme environment throughout the test, avoiding the problem of sensor distortion due to high and low temperature; this utility model technology improves the accuracy of the test and the reliability of the data, and is suitable for widespread application. Attached Figure Description

[0008] Figure 1 is a structural diagram of this utility model.

[0009] Figure 2 is a three-dimensional view of Figure 1.

[0010] Figure 3 is a structural diagram of the loading mechanism.

[0011] Figure 4 is a structural diagram of the pedal plate clamp.

[0012] Figure 5 is a three-dimensional view of Figure 4.

[0013] Figure 6 is a schematic diagram of the installation structure of the rope displacement sensor.

[0014] Figure 7 is a side view of Figure 6.

[0015] Figure 8 is a structural diagram of the guide wheel. Detailed Implementation

[0016] As shown in Figures 1 and 2, a pedal performance testing device includes a base 1, an environmental chamber 2 and a frame 3 fixed on the base, a sample mounting platform 4 inside the environmental chamber, and a loading mechanism 5 on the frame.

[0017] As shown in Figures 1 and 2, the environmental chamber 2, also known as a climate chamber or environmental test chamber, is a device used to simulate and control specific environmental conditions. The platform 3 is an electric or manual multi-axis slide table. The platform, mounted on a base, can drive a loading mechanism to move forward and backward, left and right, and adjust its height. The loading mechanism is fixed to the height adjustment slider of the platform. The sample mounting platform 4 is used to fix the pedal arm assembly sample and can also drive the pedal arm assembly sample to rotate horizontally. The pedal arm assembly includes a pedal arm 10, a pedal plate 11, and a shaft tube. The pedal plate is fixedly connected to one end of the pedal arm, and the shaft tube is fixedly connected to the other end of the pedal arm. The shaft tube end of the pedal arm is fixed to the sample mounting platform to prevent the pedal plate from rotating around the shaft tube. The environmental chamber, platform, and sample mounting platform are all existing technologies in this field.

[0018] As shown in Figure 3, the loading mechanism 5 includes a bracket 501, an electric cylinder 502, a connecting seat 503, a guide rod 504, a longitudinal displacement sensor 505, a pressure sensor 506, a loading rod 507, and a pedal clamp 508. The bracket is fixed to the height adjustment slider of the platform. The electric cylinder is fixed to the bracket. The piston rod of the electric cylinder passes through the connecting seat and is fixedly connected to the connecting seat. One end of the guide rod is fixedly connected to the connecting seat, and the other end of the guide rod is slidably connected to the guide hole on the bracket. The longitudinal displacement sensor is a linear displacement sensor, fixed to the bracket, and its detection end is connected to the connecting seat. The pressure sensor is fixed to the connecting seat. One end of the loading rod is fixedly connected to the pressure sensor, and the other end of the loading rod is hinged to the pedal clamp. The longitudinal displacement sensor and the pressure sensor are integrated with the electric cylinder, which improves the accuracy of the sensors.

[0019] As shown in Figures 4 and 5, the structure of the pedal clamp 508 includes a clamping base 5081, with a hinge hole at the upper end of the clamping base. A pivot pin 5082, which is hinged to the loading rod, is provided in the hinge hole. Horizontal screws 5083 are provided on the left and right sides of the lower end of the clamping base. Each screw is fitted with a slider 5084 and a slider limiting nut 5085. The upper end of the slider is bent inward with an upper boss, and a pedal clamping bolt 5086 is provided at the upper boss. The lower end of the slider is bent inward with a lower boss 5087, which is used for limiting the pedal. The slider is provided with a waist-shaped hole for sliding connection. This structure is simple, can flexibly clamp the pedal, meets the requirements of stiffness and strength tests, has strong versatility, and can clamp the pedal laterally or longitudinally.

[0020] As shown in Figures 6, 7, and 8, the base is equipped with a sliding bracket 6, on which a pull-rope displacement sensor 7 is fixed. The rope of the pull-rope displacement sensor is guided by a guide wheel 8 fixed to the sliding bracket. The rope 701 of the pull-rope displacement sensor is connected to the back or front of the pedal plate of the sample by magnetic attraction, adhesion, or screws, without interfering with the pedal plate clamps. The sliding bracket mainly consists of a bracket and a slide rail, and the bracket can slide horizontally on the base via the slide rail. The guide wheel is fixed to the sliding bracket by a connecting pin 9 and a guide wheel washer, and the guide wheel can rotate. The use of a sliding pull-rope displacement sensor avoids the problem of having to place the lateral displacement sensor in an environmental chamber in existing test methods. This structure is simple, allows for flexible adjustment of the position of the pull-rope displacement sensor, meets the requirements of strength testing, and has strong versatility.

[0021] Pedal stiffness test: The brake pedal assembly sample is fixed on the prototype mounting platform according to the actual vehicle condition. It is connected and fixed to the thrust rod at the midpoint of the pedal's working stroke via a pin / ball joint. The electric cylinder in the loading mechanism applies a longitudinal force of (500±10) N perpendicular to the pedal surface and passing through the geometric center point of the pedal surface via the loading rod. The longitudinal force is maintained for 1 minute and then released. This process is repeated 4 times. Before the 5th test, the longitudinal displacement measurement point of the pedal is determined. For the 5th test, the specified longitudinal force of (500±10) N is applied and maintained for 1 minute. Then, the displacement of the connecting seat is measured by the longitudinal displacement sensor in the loading mechanism. This displacement is the longitudinal displacement of the pedal, which should be ≤5.0 mm. Pedal strength test: The brake pedal assembly sample is fixed on the prototype mounting platform according to the actual vehicle condition. A longitudinal force of (2000±50) N is applied perpendicular to the pedal surface and passing through the geometric center point of the pedal surface. The longitudinal force is maintained for 30 seconds and then released. Repeat the above steps 5 times, then measure the longitudinal permanent deformation and lateral permanent deformation of the original measurement points on the pedal. The longitudinal permanent deformation of the pedal surface should be ≤5.0mm, and the lateral permanent deformation should be ≤4.0mm, with no cracks or damage defects. Rotate the sample mounting table so that the side of the pedal plate is opposite to the loading mechanism. After the pedal plate and the pedal plate clamp are connected, the loading mechanism applies a lateral force of ±320N at the center of the pedal surface, with a loading speed ≤200N / s, and releases the lateral force after 30s. Repeat the above steps 5 times and record the force-displacement curve for the last time. The force-displacement curve should not show a yield point and should be free of cracks or damage defects. The longitudinal displacement sensor is a linear displacement sensor used to collect the longitudinal displacement of the pedal; the pressure sensor is a pressure sensor for stiffness testing used to collect the longitudinal or lateral force values ​​of the pedal; the rope displacement sensor is used to collect the lateral displacement of the pedal. The loading rod in the loading mechanism and the rope of the rope displacement sensor enter the environmental chamber from the environmental chamber test window.

[0022] In this manual, "longitudinal" refers to the direction of pedal rotation, while "lateral" is perpendicular to the direction of pedal rotation.

Claims

1. A pedal performance testing device, comprising a base and an environmental chamber and a frame fixed on the base, wherein the environmental chamber is provided with a sample mounting platform and the frame is provided with a loading mechanism; characterized in that: The loading mechanism comprises a bracket, an electric cylinder, a connecting seat, a guide rod, a longitudinal displacement sensor, a pressure sensor, a loading rod, and a pedal clamp. The electric cylinder is fixed to the bracket, and its piston rod passes through the connecting seat and is fixedly connected thereto. One end of the guide rod is fixedly connected to the connecting seat, and the other end is slidably connected to a guide hole on the bracket. The longitudinal displacement sensor is fixed to the bracket, and its detection end is connected to the connecting seat. The pressure sensor is fixed to the connecting seat, and one end of the loading rod is connected to the pressure sensor.

2. The pedal performance testing device according to claim 1, characterized in that: The structure of the pedal clip gripper includes a clamping base, with a hinge hole at the upper end of the clamping base. Horizontal screws are provided on the left and right sides of the lower end of the clamping base. Each screw is fitted with a slider and a slider limiting nut. The upper end of the slider is bent inward with an upper boss, and a pedal clip clamping bolt is provided at the upper boss. The lower end of the slider is bent inward with a lower boss, which is used for limiting the pedal clip.

3. The pedal performance testing device according to claim 1 or 2, characterized in that: The base is equipped with a sliding bracket, on which a pull rope displacement sensor is fixed. The rope of the pull rope displacement sensor is guided by a guide wheel fixed on the sliding bracket, and the rope of the pull rope displacement sensor is connected to the pedal plate of the sample by magnetic attraction or adhesive.

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