CN202903410U - Braking force test bench based on free drums - Google Patents

Abstract

The utility model discloses a braking force test bench based on a free roller. The motor and sensor device are installed on the left side of the basic frame of the utility model, and the display control device is installed in the middle of the basic frame. The driven roller, the free front roller and the free rear roller are installed on the right side of the foundation frame. The utility model is based on the original counter force roller test bench, according to the principle of the counter force roller brake test bench to measure the braking force, and based on the consideration of the driving form and wheels of the multi-axis drive vehicle with a through-type transmission shaft Rotation principle, changing one side of the roller to a free roller to realize the detection of the braking force, making the detection of the braking force of the multi-axis drive vehicle more convenient, fast and accurate.

Description

Braking Force Test Bench Based on Free Roller

technical field

The utility model relates to the field of automobile braking performance detection equipment, in particular to a braking force test bench based on a free roller.

Background technique

The braking performance of a car is one of the most important performances of a car. When the car is subjected to an external force opposite to the direction of travel, it can brake from a certain speed to a smaller speed or until it stops. This external force is mainly provided by the ground, which is called ground braking force. The greater the ground braking force, the greater the braking deceleration and the shorter the braking distance, so the ground braking force has a decisive impact on the braking performance of the vehicle. According to the provisions of GB18565-2001 "Comprehensive Performance Requirements and Inspection Methods for Commercial Vehicles", the detection of automobile braking performance is divided into two methods: brake test bench detection and road test detection. Under normal circumstances, the brake performance can be detected by a brake test bench, and if the result is in dispute, the road test can be used for re-inspection. According to the national standard (GB7258-2004) "Technical Conditions for Safe Operation of Motor Vehicles", when using the brake test bench for testing, the percentage of braking force and vehicle weight should not be less than 60, and the percentage of front axle braking force and axle load should not be less than 60 , the percentage of rear axle braking force to axle load is not less than 20.

According to the different forms of supporting wheels, the brake test bench can be divided into two types: drum type and flat type. According to different measurement principles, the roller test bench can be divided into two types: reaction force type and inertia type. When using the flat brake test bench, the vehicle under test adopts emergency braking on the test flat to detect the magnitude of the braking force. However, because the direction of the vehicle driving on the flat plate is not easy to grasp, the error of the braking force is relatively large, and the repeatability of the detection is relatively low. When the reaction force and inertia roller test benches are in use, the wheels are placed on the main and driven rollers, and the motor drives the rollers to drive the wheels to rotate. The difference is that the reaction brake test bench measures the braking force under the emergency braking of the vehicle, while the inertia brake test bench simulates the driving conditions of the vehicle on the road by adding a flywheel, and detects Braking distance, braking time and braking deceleration for each wheel.

However, the scope of use of the drum-type brake test bench is relatively limited, and four-wheel drive vehicles cannot be detected on the usual safety inspection line. First of all, the detected data cannot truly reflect the value of the braking force. In addition, the differential device of the vehicle may be damaged. Therefore, the detection of the braking performance of these vehicle models cannot be completed using the above two braking test benches.

Utility model content

The problem to be solved by the utility model is to solve the braking force detection of a multi-axis drive vehicle with through shafts. In order to make up for the limitations of the common reaction roller braking test bench, a braking force test bench based on the free roller is provided.

The utility model is a braking force test bench based on free rollers. A motor and a sensor device are installed on the left side of the base frame, and a display control device is installed in the middle of the base frame. Connect the motor, the power roller shaft is connected to the driven roller through the transmission chain, and the free front roller and the free rear roller are installed on the right side of the foundation frame.

With the increase of four-wheel drive vehicles and multi-axle drive trucks, the detection of their safety performance is the guarantee of vehicle safety and the premise of vehicle travel. However, it is difficult to detect the braking force of each wheel of a vehicle with a through-type transmission shaft on a common reaction roller braking force detection platform. The utility model is based on the original counter force roller test bench, according to the principle of the counter force roller brake test bench to measure the braking force, based on consideration of the drive form and wheels of the multi-axis drive vehicle with a through-type transmission shaft Rotation principle, changing one side of the roller to a free roller to realize the detection of the braking force, making the detection of the braking force of the multi-axis drive vehicle more convenient, fast and accurate.

Description of drawings

Figure 1 is a schematic structural view of the utility model;

Figure 2 is a comparison chart of the values obtained by testing the left and right wheels of each axle of a full-time four-wheel drive vehicle and the values tested by a common test bench.

Detailed ways

Below in conjunction with accompanying drawing 1 the utility model is described further.

As shown in Figure 1, the motor 2 and the sensor device 1 are installed on the left side of the foundation frame of the present utility model, the display control device 6 is installed in the middle of the foundation frame, the power roller 5 and the driven roller 4 are installed on the left side of the foundation frame, and the power roller shaft is connected to the motor. The power roller shaft is connected with the driven roller through the transmission chain 3, and the free front roller 7 and the free rear roller 8 are installed on the right side of the base frame.

When inspecting the vehicle, put the car on the inspection table, place the wheel of the inspected axle on the roller, start the forward and reverse motors at the same time, the left and right rollers turn in opposite directions, and the speed is equal. The driver brakes the vehicle and measures the braking force. In this way, the parking space is changed, and the braking forces of other axes are detected in sequence. the

Test data verification

The utility model detects the left and right wheels of each axle of a time-sharing four-wheel drive vehicle, a full-time four-wheel drive vehicle and a time-sharing six-wheel drive vehicle, and obtains a numerical value and compares it with the numerical value detected by a common test bench, so that the method is feasible. A set of test data is described below.

         Table 1 Test data of Warriors (full-time four-wheel drive)

the 1 time 2 times 3 times 4 times 5 times 6 times 7 times 8 times Ordinary drum left wheel braking force 5800 6100 6550 6100 5900 6000 6350 5950 Braking force of free roller left wheel 6340 6820 6090 6550 5950 6430 6040 6000

According to the collected data, it can be seen from the above table 1 to Fig. 2 that after repeated tests, the data obtained by the test results of the utility model meet the data obtained by the braking force detection method stipulated by the state of my country, and the allowable error within range. For a multi-axis drive vehicle, when the braking test is performed, if one side is changed to a free roller, the detected braking force is consistent with the result of the ordinary roller test. The test bench of the utility model is feasible that one side is a free roller, and it is also a good method for detecting the braking force of a time-sharing four-wheel drive vehicle and a through-drive vehicle during full drive.

Claims (1)

1. The braking force test bench based on the free roller, the motor and the sensor device are installed on the left side of the base frame, and the display control device is installed in the middle of the base frame. The motor and the power roller shaft are connected to the driven roller through the transmission chain, and the free front roller and the free rear roller are installed on the right side of the foundation frame.