Device for realizing caliper brake test by using tire friction force

Abstract

The utility model discloses a device for realizing a caliper brake test by using tire friction, which relates to the field of brake tests of automobile wheels and suspension systems and comprises a motor, the motor is fixedly mounted on the ground, a computer and a motor rotating speed and torque controller are fixedly mounted on a desktop and are connected through an electric wire, and the computer is connected with the motor rotating speed and torque controller through an electric wire. The motor rotating speed torque controller is connected with the motor through an electric wire, a bearing supporting seat is fixedly installed on the ground, a driving shaft is rotatably installed on the bearing supporting seat, the driving shaft is fixedly connected with an output shaft of the motor through a coupler, an inertia wheel and a simulated road surface drum are fixedly installed on the driving shaft, and a 1 / 4 suspension is fixedly installed on the table top. According to the utility model, the rotational inertia can be automatically obtained through the computer, and the caliper brake test is automatically carried out.

Description

Technical Field

[0001] The utility model relates to the field of automobile wheel and suspension system brake test, in particular to a device for realizing caliper brake test by utilizing tire friction force. Background Art

[0002] With the rapid development of the automobile industry, people have higher requirements for automobile braking safety, and the braking system test of the whole vehicle can often only be carried out during the road test stage of the vehicle, such as braking distance, braking acceleration, and the impact of braking on chassis components, etc. At present, there is a single braking performance test bench to verify the braking system, but this type of bench test has a small test range, with only brake calipers and brake discs as tested components, and the test of the entire suspension system rarely includes the braking system. Therefore, it is difficult to integrate the two systems together for testing during the component verification period. Therefore, we need a method that can add a braking control device to the wheel and suspension system test bench to realize the fusion test of the two subsystems, and a key technology for braking testing is the simulation of vehicle rotational inertia. Utility Model Content

[0003] The utility model aims to provide a device which can automatically obtain the moment of inertia through a computer and automatically perform a caliper brake test.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a device for realizing caliper brake test by using tire friction, including a motor, the motor is fixedly installed on the ground, a computer and a motor speed torque controller are fixedly installed on the desktop, the computer and the motor speed torque controller are connected by wires, the motor speed torque controller is connected to the motor by wires, a bearing support seat is fixedly installed on the ground, a drive shaft is rotatably installed on the bearing support seat, the drive shaft is fixedly connected to the output shaft of the motor by a coupling, an inertia wheel and a simulated road drum are fixedly installed on the drive shaft, and a 1 / 4 suspension is fixedly installed on the desktop. The number of inertia wheels installed is obtained by calculating the inertia through the computer, and the electrical signal is transmitted to the motor speed torque controller, and the motor speed torque controller then transmits the signal to the motor. The number of inertia wheels to be used and the output torque of the motor are calculated by inputting the rotational inertia of the vehicle to be tested into the computer, so as to obtain the most suitable rotational inertia, and the number of inertia wheels to be used needs to be manually adjusted and fixed with bolts.

[0005] Furthermore, the three wheels in the inertia wheel have different moments of inertia, and the moment of inertia of the fixed inertia wheel is 150 -200 , the rotational inertia range of the intermediate inertia wheel is 100 150 , the rotational inertia range of the outermost inertia wheel is 80 -100 When not in use, the middle inertia wheel and the outermost inertia wheel are fixed to the base. Before the test, a vertical downward pressure is applied to the 1 / 4 suspension so that the tire fits tightly with the surface of the simulated road drum. When the simulated road drum rotates, the tire will also rotate.

[0006] Furthermore, after inputting the target moment of inertia, the computer will automatically match the best inertia wheel combination according to the size of the moment of inertia. After manually adjusting the number of inertia wheels and confirming it on the computer, the test can be started.

[0007] Furthermore, taking the installation of the middle inertia wheel of the inertia wheel as an example, first use the inertia wheel hoist to clamp the edge groove of the middle inertia wheel of the inertia wheel, then take the inertia wheel out of the fixing seat, slide it to the edge of the inertia wheel fixing inertia wheel, rotate the inertia wheel fixing inertia wheel so that its threaded hole corresponds to the bolt of the middle inertia wheel of the inertia wheel, and tighten the bolts diagonally in turn.

[0008] Furthermore, a certain vertical force is applied to the 1 / 4 suspension end to make the tire fit tightly with the outer surface of the simulated road drum, and the motor drives the inertia wheel to reach the initial braking speed. The rear motor no longer provides power, and the suspension part starts to brake. Since there is a large friction between the tire and the surface of the simulated road drum, the braking of the suspension part will continue for a period of time under the combined action of the simulated drum and the inertia of the inertia wheel and the motor. The drive motor adopts torque closed-loop control. At this time, the set torque value of the motor is The suspension brake decelerates to a certain speed and stops braking. At the same time, the motor driving force is also stopped, and preparation is made for the next acceleration.

[0009] Furthermore, the fixed inertia wheel is connected to the drive shaft by a spline, the intermediate inertia wheel is connected to the fixed inertia wheel by bolts, and the outermost inertia wheel is connected to the intermediate inertia wheel by bolts.

[0010] Furthermore, one side of the fixed inertia wheel and the intermediate inertia wheel is a concave conical surface, and the taper range is between 100:1-60:1.

[0011] Furthermore, grooves are provided on both sides of the outer edges of the middle inertia wheel and the outermost inertia wheel to facilitate manual lifting.

[0012] Furthermore, the moment of inertia of the simulated road drum is 200-350 , and the friction coefficient of the outer surface in contact with the tire is greater than 0.6.

[0013] Compared with the prior art, the utility model has the following beneficial effects: (1) the utility model can automatically obtain the moment of inertia through a computer and automatically perform a caliper brake test; (2) the utility model can break away from the limitation of the whole vehicle test and use an inertia wheel and a motor to simulate the moment of inertia of the whole vehicle through tire friction; (3) the utility model requires fewer resources and consumes less energy when performing simulation tests, and has a large range of moment of inertia simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structural principle of the utility model.

[0015] Figure 2 It is a detailed structural diagram of the inertia wheel of the utility model.

[0016] Figure 3 This is a schematic diagram of the groove structure of the utility model.

[0017] Figure numbers: 1-computer; 2-motor speed torque controller; 3-motor; 4-coupling; 5-drive shaft; 6-inertia wheel; 7-simulated road drum; 8-1 / 4 suspension; 9-bearing support seat; 10-inertia wheel hoist; 6.1-fixed inertia wheel; 6.2-middle inertia wheel; 6.3-outermost inertia wheel; 6.4-inertia wheel base. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0019] Example: Figure 1-Figure 3 The device for implementing a caliper brake test using tire friction force shown in the figure comprises a motor 3, which is fixedly mounted on the ground, a computer 1 and a motor speed torque controller 2 are fixedly mounted on the desktop, the computer 1 and the motor speed torque controller 2 are connected by wires, the motor speed torque controller 2 is connected to the motor 3 by wires, a bearing support seat 9 is fixedly mounted on the ground, a drive shaft 5 is rotatably mounted on the bearing support seat 9, the drive shaft 5 is fixedly connected to the output shaft of the motor 3 by a coupling 4, an inertia wheel 6 and a simulated road surface drum 7 are fixedly mounted on the drive shaft 5, and a 8 is fixedly mounted on the desktop. The number of inertia wheels 6 installed is obtained by calculating the inertia of the computer 1, and the electrical signal is transmitted to the motor speed torque controller 2, and the motor speed torque controller 2 then transmits the signal to the motor 3.

[0020] The maximum power of the motor 3 is 80 kW, the maximum torque is 3000 Nm, and the maximum speed is 600 rpm.

[0021] The flange diameter of the coupling 4 is between 250 mm and 400 mm.

[0022] The material of the inertia wheel 6 has a density of not less than 6000 of metal.

[0023] The three wheels in the inertia wheel 6 have different moments of inertia. The moment of inertia of the fixed inertia wheel 6.1 is 150 -200 The rotational inertia range of the intermediate inertia wheel 6.2 is 100 150 The rotational inertia range of the outermost inertia wheel 6.3 is 80 -100 When not in use, the middle inertia wheel 6.2 and the outermost inertia wheel 6.3 are fixed to the base. Before the test, a vertical downward pressure is applied to the 1 / 4 suspension so that the tire fits tightly with the surface of the simulated road drum 7. When the simulated road drum 7 rotates, the tire will also rotate. When conducting the test, it is necessary to input parameters into the computer 1, which automatically calculates and uses the following set parameters: Caliper brake torque , target moment of inertia , initial speed at the start of braking .

[0024] The relationship between the motor drive torque and the simulated moment of inertia is as follows:

[0025]

[0026] In the formula computer 1: Provides torque value for the motor, is the braking torque value, is the moment of inertia of the inertia wheel, is the target moment of inertia.

[0027] After inputting the target moment of inertia, the computer will automatically match the best inertia wheel combination according to the size of the moment of inertia. After manually adjusting the number of inertia wheels and confirming it on the computer, the test can be started.

[0028] Taking the installation of the middle inertia wheel 6.2 as an example, first use the inertia wheel hoist to clamp the edge groove of the middle inertia wheel 6.2, then take the inertia wheel out of the fixing seat, slide it to the edge of the inertia wheel fixing inertia wheel 6.1, rotate the inertia wheel fixing inertia wheel 6.1 so that its threaded hole corresponds to the bolt of the middle inertia wheel 6.2, and tighten the bolts diagonally in turn.

[0029] A certain vertical force is applied to the end face of the 1 / 4 suspension 8, so that the tire fits tightly with the outer surface of the simulated road drum, and the motor drives the inertia wheel to reach the initial braking speed. The rear motor no longer provides power, and the suspension part starts to brake. Since there is a large friction between the tire and the surface of the simulated road drum, the braking of the suspension part will continue for a period of time under the combined action of the simulated drum and the inertia of the inertia wheel and the motor. The drive motor adopts torque closed-loop control. At this time, the set torque value of the motor is The suspension brake decelerates to a certain speed and stops braking. At the same time, the motor driving force is also stopped, and preparation is made for the next acceleration.

[0030] The fixed inertia wheel 6.1 is connected to the drive shaft 5 by means of a spline, the intermediate inertia wheel 6.2 is connected to the fixed inertia wheel 6.1 by means of bolts, and the outermost inertia wheel 6.3 is connected to the intermediate inertia wheel 6.2 by means of bolts.

[0031] One side of the fixed inertia wheel 6.1 and the intermediate inertia wheel 6.2 is a concave conical surface, and the taper range is between 100:1-60:1.

[0032] There are grooves on both sides of the outer edges of the middle inertia wheel 6.2 and the outermost inertia wheel 6.3 to facilitate manual lifting.

[0033] The moment of inertia of the simulated road drum 7 is 200-350 , and the friction coefficient of the outer surface in contact with the tire is greater than 0.6.

Claims

1. A device for implementing a caliper brake test using tire friction, characterized in that: The invention comprises a motor (3), wherein the motor (3) is fixedly mounted on the ground, a computer (1) and a motor speed torque controller (2) are fixedly mounted on the desktop, the computer (1) and the motor speed torque controller (2) are connected via electric wires, the motor speed torque controller (2) and the motor (3) are connected via electric wires, a bearing support seat (9) is fixedly mounted on the ground, a drive shaft (5) is rotatably mounted on the bearing support seat (9), the drive shaft (5) is fixedly connected to the output shaft of the motor (3) via a coupling (4), an inertia wheel (6) and a simulated road surface drum (7) are fixedly mounted on the drive shaft (5), and a 1 / 4 suspension is fixedly mounted on the desktop.

2. The device for implementing a caliper brake test using tire friction according to claim 1, characterized in that: The three wheels in the inertia wheel (6) have different moments of inertia. The moment of inertia of the fixed inertia wheel (61) is 150 -200 The rotational inertia range of the intermediate inertia wheel (62) is 100 150 The moment of inertia of the outermost inertia wheel (63) is 80 -100 When not in use, the middle inertia wheel (62) and the outermost inertia wheel (63) are fixed on the base. Before the test, a vertical downward pressure is applied to the 1 / 4 suspension so that the tire is tightly fitted with the surface of the simulated road drum (7). When the simulated road drum (7) rotates, the tire also rotates.

3. The device for implementing a caliper brake test using tire friction according to claim 2, characterized in that: The fixed inertia wheel (61) is connected to the drive shaft (5) by means of a spline, the intermediate inertia wheel (62) is connected to the fixed inertia wheel (61) by means of bolts, and the outermost inertia wheel (63) is connected to the intermediate inertia wheel (62) by means of bolts.

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