Differential lock locking function test bench

Abstract

The utility model relates to the technical field of differential lock detection, and discloses a differential lock locking function test bench, which comprises an automobile rear axle, a differential lock, a magnetic powder clutch and a variable frequency motor, the differential lock is carried on the automobile rear axle and comprises an input shaft, a left half shaft and a right half shaft, the magnetic powder clutch and the variable frequency motor are fixed on the automobile rear axle, and the variable frequency motor is fixed on the input shaft. The magnetic powder clutch is connected with the left half shaft through the torque sensor, and a power shaft of the variable frequency motor is connected with the input shaft through the torque sensor. The differential lock test bench has the following beneficial effects: 1, the test bench is used for completing the test of a differential lock, the test bench is not limited by sites, the test cost can be greatly reduced, and the convenience is improved; and 2, the test of the differential lock is completed through the test bench, so that the test result is more accurate. And 3, the test bench can be used for testing in two different modes, so that the convenience of the test is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to differential lock detection technical field, concretely relates to a differential lock locking function test board. BACKGROUND

[0002] With the continuous development of automobile technology, the performance requirements such as controllability and passability of vehicles are higher and higher, and the differential lock plays an important role in improving the performance of vehicles and maintaining the stability of vehicles, so the performance of the differential lock needs to be tested and verified. The core function of the differential lock is realized through the locking mechanism, that is, the locking function of the differential lock is verified.

[0003] The significance of differential lock locking test is that whether the locking function of the differential lock under different working conditions is normal can be verified, and the safety and stability of vehicle driving are guaranteed. According to the test data, the problems of the differential lock can be found out and improved, and it is used as the basis for the performance of the differential lock.

[0004] At present, the commonly used differential lock locking test method is whole vehicle road test. The differential lock to be tested is installed on the experimental vehicle, and the necessary test equipment is installed. Different road conditions are simulated through the site, the required working conditions of the test are completed through the automobile, the corresponding data are collected to achieve the test target. This test method is limited by the site and is easily affected by other parts of the automobile and human factors. Moreover, the overall cost is too high. The overall structure of the existing differential lock locking fatigue test bench is relatively complex, the cost of the equipment is high, the maintenance and operation may be relatively difficult, the space occupied is large, and the use of the site is limited. UTILITY MODEL CONTENTS

[0005] To solve the above problems, the utility model provides a differential lock locking function test board, and the utility model is realized through the following technical schemes.

[0006] A differential lock locking function test board, comprising an automobile rear axle, a differential lock, a magnetic powder clutch and a variable frequency motor, the differential lock is carried on the automobile rear axle, the differential lock comprises an input shaft, a left half shaft and a right half shaft, the magnetic powder clutch and the variable frequency motor are fixed on the automobile rear axle, the magnetic powder clutch is connected with the left half shaft through a torque sensor, and the power shaft of the variable frequency motor is also connected with the input shaft through a torque sensor.

[0007] As a further scheme of the utility model, two rotating speed display tables are fixedly connected on the automobile rear axle, the left half shaft and the right half shaft pass through the detection through holes of one of the rotating speed display tables respectively, a temperature display table is fixedly connected on the shell of the differential lock, and the detection end of the temperature display table extends into the shell of the differential lock.

[0008] As a further scheme of the utility model, still include 220V AC mains, the 220V AC mains include fire line and zero line, the fire line passes through circuit breaker electric connection magnetic powder clutch, torque sensor, tachometer and temperature display table's anode connection terminal, magnetic powder clutch, torque sensor, tachometer and temperature display table's cathode connection terminal are electrically connected with zero line.

[0009] As a further scheme of the utility model, the three-phase connection terminal of the variable frequency motor is electrically connected with the three-phase output terminal of the frequency converter respectively, and the three-phase input terminal of the frequency converter is connected with the three-phase circuit of the 380V external power source through the AC contactor and the fuse in sequence.

[0010] As a further scheme of the utility model, still include PLC controller, the model of PLC controller is MELSEC FX1S-20MT, and the power supply interface L and N of PLC controller are electrically connected with the fire line and zero line of 220V AC mains respectively, and the output COM end of PLC controller is connected with the X0, X1, X2, X3, X4, X5, X6, X7 and X10 interfaces of PLC controller through switches SB1-SB9 in parallel.

[0011] As a further scheme of the utility model, the switches SB1 and SB4 are connected in parallel in the control circuit of the variable frequency motor, when the switch SB1 is turned on, the variable frequency motor works at constant speed, when the switch SB4 is turned on, the speed of the variable frequency motor is increased to the predetermined test speed and maintained, the switches SB2 and SB5 are connected in parallel in the control circuit of the differential lock, when the switch SB2 or SB5 is turned on, the differential lock is powered on, when the switch SB2 or SB5 is turned off, the differential lock is powered off.

[0012] As a further scheme of the utility model, still include switching power supply, the switching power supply is used to convert 220V AC mains into 12V DC power output, the positive output end of the switching power supply is electrically connected with the Y0, Y1, Y3 and Y4 interfaces of PLC controller through relays KA1, KA2, KA3 and KA4 respectively, and the negative output end of the switching power supply is electrically connected with the input COM0, COM1, COM2, COM3 and COM4 interfaces of PLC controller.

[0013] The switches SB3 and SB6 are manual switches, and the switches SB1, SB2, SB4 and SB5 are electromagnetic switches and are controlled by the relays KA1, KA2, KA3 and KA4 respectively.

[0014] The utility model has the advantages of the following:

[0015] 1. This application completes the differential lock test through a test bench. Compared with the traditional whole vehicle test, this application is not limited by the site and can greatly reduce the test cost and improve convenience.

[0016] 2. Traditional methods of testing differential locks through whole vehicle testing are easily affected by other parts of the vehicle, resulting in inaccurate results. This application uses a test bench to test the differential locks, which can make the test results more accurate.

[0017] 3. The test bench of this application can perform two different modes of testing, which improves the convenience of testing. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 : A schematic diagram of the structure of a differential lock locking function test bench according to this utility model;

[0020] Figure 2 Schematic diagram of 220V AC mains power supply;

[0021] Figure 3 : Schematic diagram of the power connection of a variable frequency motor;

[0022] Figure 4 : Circuit connection diagram of PLC controller;

[0023] Figure 5 Flowchart for Mode 1;

[0024] Figure 6 Flowchart for Mode 2.

[0025] The attached figures are labeled as follows:

[0026] 1- Rear axle of automobile, 2- Differential lock, 21- Input shaft, 22- Left half shaft, 23- Right half shaft, 3- Magnetic powder clutch, 4- Variable frequency motor, 41- Inverter, 42- AC contactor, 43- Fuse, 44- 380V external power supply, 5- Torque sensor, 6- Tachometer, 7- Temperature display, 81- Live wire, 82- Neutral wire, 83- Circuit breaker, 9- PLC controller, 10- Switching power supply. Detailed Implementation

[0027] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0028] As shown in FIG. Figures 1-6 A differential lock locking function test bench, comprising an automobile rear axle 1, a differential lock 2, a magnetic powder clutch 3 and a variable frequency motor 4, the differential lock 2 is carried on the automobile rear axle 1, the differential lock 2 comprises an input shaft 21, a left half shaft 22 and a right half shaft 23, the magnetic powder clutch 3 and the variable frequency motor 4 are fixed on the automobile rear axle 1, the magnetic powder clutch 3 is connected with the left half shaft 22 through a torque sensor 5, and the power shaft of the variable frequency motor 4 is also connected with the input shaft 21 through the torque sensor 5.

[0029] As shown in FIG. Figure 1 The power shaft of the variable frequency motor 4 is connected with the input shaft 21 and used for driving the input shaft 21 to rotate, the input shaft 21 drives the left half shaft 22 and the right half shaft 23 to rotate through the differential lock 2, the torque at the input shaft 21 and the left half shaft 22 can be detected through the torque sensor 5, the left half shaft 22 is loaded when the magnetic powder clutch 3 is powered on, and the rotational speed of the left half shaft 22 and the right half shaft 23 changes when the differential lock 2 is locked and disconnected, so that the locking working condition of the differential lock 2 in the actual running process of the vehicle is simulated, and the durability and stability of the differential lock 2 are detected through cycle test.

[0030] Two rotational speed display tables 6 are fixed on the automobile rear axle 1, the left half shaft 22 and the right half shaft 23 pass through the detection through holes of one of the rotational speed display tables 6 respectively, a temperature display table 7 is fixed on the shell of the differential lock 2, and a detection end of the temperature display table 7 extends into the shell of the differential lock 2.

[0031] As shown in FIG. Figure 1 The rotational speed of the left half shaft 22 and the right half shaft 23 can be detected through the rotational speed display table 6, and the temperature in the shell of the differential lock 2 can be detected through the temperature display table 7.

[0032] 220V AC mains, the 220V AC mains comprising a live wire 81 and a neutral wire 82, the live wire 81 being electrically connected to the anode connection end of the magnetic powder clutch 3, the torque sensor 5, the rotational speed display table 6 and the temperature display table 7 through a circuit breaker 83, and the cathode connection end of the magnetic powder clutch 3, the torque sensor 5, the rotational speed display table 6 and the temperature display table 7 being electrically connected to the neutral wire 82.

[0033] As shown in FIG. Figure 2 The magnetic powder clutch 3, the torque sensor 5, the rotational speed display table 6 and the temperature display table 7 are powered through the 220V AC mains.

[0034] The three-phase connection terminals of the variable frequency motor 4 are electrically connected with the three-phase output terminals of the frequency converter 41 respectively, and the three-phase input terminals of the frequency converter 41 are connected with the three-phase circuit of the 380V external power supply 44 through the AC contactor 42 and the fuse 43 respectively.

[0035] As shown in Figure 3 , the variable frequency motor 4 is powered by the 380V external power supply 44, the fuse 43 is used to protect the variable frequency motor 4, and the frequency converter 41 is used to control the rotating speed of the variable frequency motor 4.

[0036] The PLC controller 9 is also included, the model of the PLC controller 9 is MELSEC FX1S-20MT, the power supply interfaces L and N of the PLC controller 9 are electrically connected with the live wire 81 and the zero wire 82 of the 220V AC mains respectively, and the output COM terminals of the PLC controller 9 are connected with the X0, X1, X2, X3, X4, X5, X6, X7 and X10 interfaces of the PLC controller 9 through the switches SB1-SB9 respectively.

[0037] As shown in Figure 4 , the switches SB1-SB9 are controlled by the PLC controller 9.

[0038] The switches SB1 and SB4 are connected in parallel in the control circuit of the variable frequency motor 4, when the switch SB1 is turned on, the variable frequency motor 4 works at a constant rotating speed, and when the switch SB4 is turned on, the rotating speed of the variable frequency motor 4 is increased to a predetermined test rotating speed and kept; the switches SB2 and SB5 are connected in parallel in the control circuit of the differential lock 2, when the switch SB2 or SB5 is turned on, the differential lock 2 is powered, and when the switch SB2 or SB5 is turned off, the differential lock 2 is powered off.

[0039] The switching power supply 10 is also included, which is used to convert the 220V AC mains into 12V DC power output, the positive output terminals of the switching power supply 10 are electrically connected with the Y0, Y1, Y3 and Y4 interfaces of the PLC controller 9 through the relays KA1, KA2, KA3 and KA4 respectively, and the negative output terminal of the switching power supply 10 is electrically connected with the COM0, COM1, COM2, COM3 and COM4 interfaces of the PLC controller 9.

[0040] The switches SB3 and SB6 are manual switches, and the switches SB1, SB2, SB4 and SB5 are electromagnetic switches, which are controlled by the relays KA1, KA2, KA3 and KA4 respectively.

[0041] The on-off of the switches SB1, SB2, SB4 and SB5 can be controlled by controlling the on-off of the relays KA1, KA2, KA3 and KA4 through programming the PLC controller 9, and the on time of the switches SB1, SB2, SB4 and SB5 can be controlled by controlling the relay time of the relays KA1, KA2, KA3 and KA4, thereby controlling the variable frequency motor 4 and the differential lock 2.

[0042] The differential lock 2 locking function test method has two test modes, mode one and mode two, and the switches SB3 and SB6 are mode selection switches.

[0043] As shown in Figure 5 , preferably, the flow of mode one is as follows:

[0044] S1, mode selection, the switch SB3 is closed, and mode one is selected for testing;

[0045] When the switch SB3 is on, it indicates that mode one is used for testing, and at this time the relays KA1 and KA2 control the on-off of the switches SB1 and SB2.

[0046] S2, the variable frequency motor 4 works at a constant speed, and the magnetic powder clutch 3 applies a load to the left half shaft 22;

[0047] First, the relay KA1 controls the switch SB1 to be on, the variable frequency motor 4 works at a constant speed, and the magnetic powder clutch 3 applies a load to the left half shaft 22;

[0048] S3, the differential lock 2 is unlocked by being powered off, the left half shaft 22 and the right half shaft 23 form a speed difference, and run for a preset time;

[0049] In the initial state, the switch SB2 is off, the left half shaft 22 forms a speed difference with the right half shaft 23 under the load of the magnetic powder clutch 3, and runs for a period of time.

[0050] S4, the differential lock 2 is locked by being powered on, the left half shaft 22 and the right half shaft 23 rotate synchronously, and run for a preset time;

[0051] Then the relay KA2 controls the switch SB2 to be on, the differential lock 2 is locked by being powered on, the left half shaft 22 and the right half shaft 23 rotate synchronously, and run for a period of time.

[0052] S5, repeat steps S3 and S4.

[0053] Mode one can verify the life fatigue test of the differential lock 2 when the variable frequency motor 4 is at a fixed speed.

[0054] As shown in Figure 6 , the flow of mode two is as follows:

[0055] T1, mode selection, switch SB6 is closed, mode two is selected for testing;

[0056] When switch SB6 is on, it indicates that testing is performed in mode two, at which time relays KA3 and KA4 control the on-off of switches SB4 and SB5.

[0057] T2, the magnetic powder clutch 3 applies a load to the left half shaft 22;

[0058] T3, the differential lock 2 is powered to be locked, the left half shaft 22 and the right half shaft 23 rotate synchronously, the rotating speed of the variable frequency motor 4 is increased to a predetermined test rotating speed and runs for a preset time;

[0059] First, the relay KA4 controls the switch SB5 to be closed, the differential lock 2 is powered to be locked, then the relay KA3 controls the switch SB4 to be closed, the rotating speed of the variable frequency motor 4 is increased to a predetermined test rotating speed and runs for a preset time.

[0060] T4, the differential lock is powered off to be unlocked, the left half shaft 22 and the right half shaft 23 generate a rotating speed difference and run for a preset time;

[0061] After a period of time, the relay KA4 controls the switch SB5 to be opened, the differential lock 2 is powered off to be unlocked, the left half shaft 22 and the right half shaft 23 generate a rotating speed difference.

[0062] T5, the variable frequency motor 4 is powered off, and the rotating speed of the variable frequency motor 4 is reduced to zero;

[0063] After a period of time, then the relay KA3 controls the switch SB4 to be opened, the variable frequency motor 4 is powered off, and the rotating speed of the variable frequency motor 4 is reduced to zero.

[0064] T6, steps T3-T5 are repeated.

[0065] The cycle test, the test mode two is used for simulating the working condition that the automobile can automatically unlock after the rotating speed is increased to a certain stage under the condition that the differential lock 2 is locked and the automobile passes through complex road conditions.

[0066] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details and limit the utility model to the specific implementation. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and use the utility model. The utility model is limited by the claims and the whole scope and equivalents.

Claims

1. A differential lock locking function test bench, comprising an automobile rear axle (1), a differential lock (2), a magnetic powder clutch (3) and a variable frequency motor (4), characterized in that, The differential lock (2) is mounted on the automobile rear axle (1), the differential lock (2) includes an input shaft (21), a left half shaft (22) and a right half shaft (23), the magnetic powder clutch (3) and the variable frequency motor (4) are fixed on the automobile rear axle (1), the magnetic powder clutch (3) is connected with the left half shaft (22) through the torque sensor (5), and the power shaft of the variable frequency motor (4) is also connected with the input shaft (21) through the torque sensor (5).

2. A differential lock (2) blocking function test bench according to claim 1, characterized in that Two rotating speed display tables (6) are fixed on the automobile rear axle (1), the left half shaft (22) and the right half shaft (23) pass through the detection through holes of one of the rotating speed display tables (6) respectively, and a temperature display table (7) is fixed on the shell of the differential lock (2), and the detection end of the temperature display table (7) extends into the shell of the differential lock (2).

3. A differential lock (2) blocking function test bench according to claim 2, characterized in that 220V AC mains is further included, the 220V AC mains includes a live wire (81) and a zero wire (82), the live wire (81) is electrically connected with the anode connection end of the magnetic powder clutch (3), the torque sensor (5), the rotating speed display table (6) and the temperature display table (7) through the circuit breaker (83), and the cathode connection end of the magnetic powder clutch (3), the torque sensor (5), the rotating speed display table (6) and the temperature display table (7) is electrically connected with the zero wire (82).

4. A differential lock (2) blocking function test bench according to claim 3, characterized in that The three-phase connection end of the variable frequency motor (4) is electrically connected with the three-phase output end of the frequency converter (41) respectively, the three-phase input end of the frequency converter (41) is connected with the three-phase circuit of the 380V external power source through the AC contactor (42) and the fuse (43) respectively in sequence.

5. A differential lock (2) blocking function test bench according to claim 4, characterized in that A PLC controller (9) is further included, the model of the PLC controller (9) is MELSEC FX1S-20MT, the power supply interfaces L and N of the PLC controller (9) are electrically connected with the live wire (81) and the zero wire (82) of the 220V AC mains respectively, and the output COM end of the PLC controller (9) is connected with the X0, X1, X2, X3, X4, X5, X6, X7 and X10 interfaces of the PLC controller (9) through switches SB1-SB9 in parallel.

6. A differential lock (2) blocking function test bench according to claim 5, characterized in that The switches SB1 and SB4 are connected in parallel in the control circuit of the variable frequency motor (4), when the switch SB1 is turned on, the variable frequency motor (4) works at a constant rotating speed, when the switch SB4 is turned on, the rotating speed of the variable frequency motor (4) is increased to a predetermined test rotating speed and is kept, the switches SB2 and SB5 are connected in parallel in the control circuit of the differential lock (2), when the switch SB2 or SB5 is turned on, the differential lock (2) is powered on, when the switch SB2 or SB5 is turned off, the differential lock (2) is powered off.

7. A differential lock (2) blocking function test bench according to claim 6, characterized in that A switching power supply (10) is further included, the switching power supply (10) is used for converting the 220V AC mains into 12V DC power supply output, the positive output end of the switching power supply (10) is electrically connected with the Y0, Y1, Y3 and Y4 interfaces of the PLC controller (9) through relays KA1, KA2, KA3 and KA4 respectively, and the negative output end of the switching power supply (10) is electrically connected with the input COM0, COM1, COM2, COM3 and COM4 interfaces of the PLC controller (9). The switches SB3 and SB6 are manual switches, and the switches SB1, SB2, SB4 and SB5 are electromagnetic switches, and are controlled by the relays KA1, KA2, KA3 and KA4, respectively. The switches SB3 and SB6 are manual switches, and the switches SB1, SB2, SB4 and SB5 are electromagnetic switches, and are controlled by the relays KA1, KA2, KA3 and KA4, respectively.

Images