CN216815347U - A vehicle front axle toe-in value measuring device - Google Patents

Abstract

The utility model provides a device for measuring a toe-in value of an automobile front axle, which comprises a device for measuring the toe-in value by a laser displacement sensor, a brake drum rotating device, a limit limiting device, a servo motor driving device, a motor for bearing the laser displacement sensor, a brake drum rotating motor, a man-machine interaction unit, a pulse transmission unit, a real-time toe-in value detection unit, a motor origin point returning unit and an electric control system. The utility model adopts the laser displacement sensor to measure the distance between the front edge and the rear edge of the brake drums at the two ends of the front axle in real time, the actually measured toe-in value can be compared with the standard toe-in value in real time and then error correction is continuously carried out until the actually measured toe-in value reaches the standard value, the accuracy of toe-in value measurement is completely ensured, and the measurement module and the correction module are matched to work into a whole, so that the operation is clear and simple, and the measurement is accurate and reliable.

Description

A vehicle front axle toe-in value measuring device

technical field

The utility model relates to the field of automobile front axle assembly, in particular to an automobile front axle toe-in value measuring device.

Background technique

The toe-in is one of the four parameters for the positioning of the front wheel of the car. When the front axle is assembled, the two brake drums need to be inclined outward at an angle to form an "outside eight" shape. The front and rear edges of the brake drums at both ends of the front axle are The difference in distance is the toe-in value. The toe-in value is set to eliminate the bad tendency after the wheels are cambered. If the toe-in value is not up to standard, the car will run off track or the tires will be worn. In recent years, the method of measuring and detecting the toe-in value of the front axle of automobiles has become a research hotspot in the field of automobiles, and fruitful theoretical and applied research results have been obtained.

As far as the measurement technology of the toe-in value of the front axle of the automobile is concerned, there are mainly measuring methods such as tape measure method, positioning plate measurement method, and front wheel aligner.

The tape measure method is to place the front axle on the front axle measuring tool, measure the distance between the front edges of the two brake drums with a tape measure, and then use a tape measure to measure the distance between the front and rear edges of the brake drums at both ends, and measure the rear edge with the front edge. The toe-in value is obtained by the difference operation of the values, and the process is relatively simple, but the measurement of the toe-in value has low precision, time-consuming and laborious correction, high labor cost and low productivity.

The positioning plate measurement method is to use a positioning plate with a "Y" structure to be fixed on the wheel hub of the front axle of the car, and also include a detection rod for detecting the spacing of the positioning plate, and the distance between the front edge and the rear edge of the wheel hub is detected by the detection rod. The toe-in value can be obtained. This method requires complicated operations such as making a measurement positioning plate and installing the measurement positioning plate, and has the problems of low measurement accuracy and low efficiency.

The measurement method of the front wheel aligner is to use two inclination sensors, a CCD sensor and an emission light source, and another angle measurement device is required during measurement. This measurement device has a simple structure but high cost, low precision and poor automation.

So far, the above-mentioned methods still face some common problems that need to be solved urgently. For example, how to improve the measurement accuracy of the toe-in value of the front axle, how to improve the production efficiency, and how to effectively reduce the cost of construction.

Therefore, the existing technology still needs to be improved and developed.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide a vehicle front axle toe value measuring device, which aims to solve the problems of low measurement accuracy, time-consuming and laborious correction, low production efficiency and high cost in the existing vehicle front axle toe value measurement. .

The technical scheme of the present utility model is as follows:

An automobile front axle toe value measuring device, including a laser displacement sensor to measure the toe value, a brake drum rotating device, a limit limit device, a servo motor drive device, a motor bearing the laser displacement sensor, a brake drum rotating motor, a human a computer interaction unit, a pulse transmission unit, a real-time detection unit for toe-in value, a motor return-to-origin unit and an electrical control system; the device for measuring the toe-in value of the laser displacement sensor is connected to the motor of the bearing laser displacement sensor, and the bearing laser displacement sensor is connected to the motor. The sensor device is respectively connected with the laser displacement sensor and the servo motor driving device, and is used to measure the distance value between the front edge and the rear edge of the brake drum to obtain the toe-in value, and the brake drum rotating motor is respectively connected with the servo motor driving device and the brake drum. Connection, used to complete the position rotation of the brake drum to match the correction and measurement of the toe-in value, the limit limit device is respectively connected with the laser displacement sensor measurement device and the brake drum rotation device, used to control the limit position of the motor movement As well as the search operation of origin return, the servo motor driver device is respectively connected with the bearing laser displacement sensor motor and the brake drum rotating motor for sending drive commands and receiving servo motor feedback information, and the electrical control system is respectively connected with the laser displacement sensor. The device for measuring the toe-in value, the drive device for the servo motor, the motor carrying the laser displacement sensor, the rotating motor for the brake drum, the drive device for the servo motor, the human-computer interaction unit, the pulse transmission unit, and the motor return-to-origin unit are electrically connected.

In the vehicle front axle toe-in value measuring device, wherein the human-computer interaction unit communicates with the system control board via the MODBUS RTU protocol. The user sets the standard toe-in value, the left and right measuring points of the brake drum, the standard of left turn and the standard of right turn, the model of the front axle, the button for returning to the origin, the button for releasing the alarm and the button for selecting the motor through the human-computer interaction unit. At the same time, the measured value of the left-end laser displacement sensor, the measured value of the right-end laser displacement sensor and the actually measured toe-in value are displayed in real time. Measurement of beam value. Through the friendly human-computer interaction interface, users can choose the corresponding front axle model according to actual needs. The system control board is an ARM Cortex-M series microprocessor, in this embodiment, an ARM Cortex-M3 series microprocessor.

The device for measuring the toe-in value of the front axle of an automobile, wherein the pulse transmission unit includes a pulse signal generator, a pulse signal differential drive circuit, and a pulse signal differential circuit receiving circuit, and the pulse signal generator uses a motion control chip As a processor, MCX314AL is connected to the system control board and the pulse signal differential drive circuit respectively for the transmission of pulse signals and the reception of motor feedback information. The pulse information differential drive circuit adopts AM26LS31CD chip to connect with MCX314AL and servo motor driver respectively. , used for the outgoing driving pulse, the pulse signal differential circuit receiving circuit is respectively connected with the servo motor driver and MCX314AL to receive the motor feedback information, the signal after passing through the differential circuit always maintains the differential form, so that the pulse signal is more Stable and accurate.

The device for measuring the toe-in value of the front axle of an automobile, wherein the real-time detection unit of the toe-in value adopts the laser displacement sensor to collect the positions of the front edge and the rear edge of the brake drum at both ends of the front axle of the automobile in real time, and the brake The drum rotation motor rotates the brake drum device to correct the position of the brake drum to obtain the standard toe-in value. After the toe-in value collected by the laser displacement sensor is processed by the data processing module, the actual toe-in value is transmitted in real time. information to the electrical control system.

In the vehicle front axle toe-in value measurement device, wherein the data processing module includes a level conversion unit, a data bidirectional asynchronous transmission unit, and an analog-to-digital conversion (ADC) unit, and the level conversion unit is connected to a motion control chip , used to convert 24V voltage into 3.3V voltage, the data bidirectional asynchronous transmission unit is respectively connected with the control board and the laser displacement sensor, the analog-to-digital conversion unit is respectively connected with the control board and the laser displacement sensor, used for the laser displacement The digital signal of the toe-in value collected by the sensor is converted into an electrical signal.

In the vehicle front axle toe-in value measurement device, wherein the motor returning to the origin unit includes the motor returning to the origin carrying the laser displacement sensor and the motor returning to the rotating brake drum, and the motor carrying the laser displacement sensor returns to the origin. It is the motor that carries the laser displacement sensor is connected to the limit limit device. When the shading plate on the laser displacement sensor passes near the origin, the motor decelerates and continues to move to the origin and stops. This point is the origin of the motor that carries the laser displacement sensor. Rotating the brake drum motor returns to the origin, after the distance between the laser displacement sensor and the brake drum is compared with the distance set by the system after the carrying laser displacement sensor returns to the origin, the error is corrected to make the rotating brake drum motor return to the original point. point.

In the vehicle front axle toe-in value measuring device, wherein the electrical control system includes a system control board, a servo motor drive circuit, a power supply circuit, a reset circuit, a limit limit circuit, a servo motor drive circuit, a power supply circuit, a reset circuit, a limit limit circuit, a data processing module, a laser displacement sensor, a human-computer interaction unit, and a motor return-to-origin unit; the motor drive circuit is respectively connected with the carrying laser displacement sensor motor and the brake drum rotating motor, and the power circuit is connected with the control system, It is used to supply power to the system. The reset circuit is connected to the control board for power-on reset of the system. The limit limit circuit is respectively connected to the bearing motor of the laser displacement sensor and the rotating device of the brake drum. The laser displacement sensor is connected to the laser displacement sensor. The displacement sensor carries the motor, and the human-computer interaction unit communicates with the system control board via the MODBUS RTU protocol.

The device for measuring the toe-in value of the front axle of an automobile further includes a system protection unit, and the system protection unit includes an overvoltage protection circuit connected with the control board and the motion control chip MCX314AL, and an optocoupler isolation chip PS2805- 4. Perform optocoupler electrical isolation and level conversion to prevent high level from burning out the control board and motion control chip.

The beneficial effects of the utility model are as follows: the toe-in value measuring device of the front axle of the automobile provided by the utility model adopts the laser displacement sensor to measure the distance between the front edge and the rear edge of the brake drums at both ends of the front axle in real time, and the actually measured toe-in value can be After the real-time comparison with the standard toe-in value, the error correction is continuously performed until the standard value is reached, which fully guarantees the accuracy of the toe-in value measurement, and the measurement module and the correction module work together to make the operation clear and simple, and the measurement is accurate and reliable; in addition, Through the system, various product types, front axle toe-in value standards and other corresponding buttons are designed in advance and set on the touch screen. The user only needs to call up the model of the front axle on the human-computer interaction interface, and the device can automatically measure, Correct the position of the brake drum to obtain the required toe-in value. The operator only needs to power on the system and select front axle products at the beginning. The entire measurement process is automatically completed by the equipment. The degree of automation is high, and it can be used without very professional training, which simplifies the operation to the greatest extent and saves labor costs. Improved production efficiency.

Description of drawings

FIG. 1 is a schematic structural diagram of a vehicle front axle toe-in value measuring device provided by the present invention.

FIG. 2 is a schematic structural diagram of an electrical control system provided by the present invention.

FIG. 3 is a structural diagram of the pulse transmission unit of the front axle toe-in value measuring equipment provided by the present invention.

4 is a flow chart of a method for measuring the toe-in value of a front axle of an automobile provided by the present invention.

Description of the drawings: 1. Brake drum at the left end of the front axle; 2. Limit photoelectric switch; 3. Ball screw at the left end; 4. Laser displacement sensor; 5. Limit photoelectric switch; 6. The left end carries a laser displacement sensor servo motor ;7. Brake drum rotating device sleeve point; 8. Brake drum rotating device pull rod; 9. Sector plate; 10. Bearing; 11. Rotating brake drum motor; 12. Servo motor with laser displacement sensor on the right end; 13. Limit position photoelectric switch; 14, laser displacement sensor; 15, limit photoelectric switch; 16, ball screw at the right end; 17, brake drum at the left end of the front axle.

Detailed ways:

In order to make the purpose, technical solutions and advantages of the present utility model more clear and definite, the present utility model is further described in detail below with reference to the accompanying drawings and examples.

As shown in FIG. 1, the utility model provides a vehicle front axle toe-in value measuring device, including a brake drum 1 at the left end of the front axle, a limit photoelectric switch 2, a ball screw at the left end 3, a laser displacement sensor 4, a limit Photoelectric switch 5, left end carrying laser displacement sensor servo motor 6, brake drum rotating device sleeve 7, brake drum rotating device pull rod 8, sector plate 9, bearing 10, rotating brake drum motor 11, right end carrying laser displacement sensor servo Motor 12, limit photoelectric switch 13, laser displacement sensor 14, limit photoelectric switch 15, ball screw 16 at the right end, brake drum 17 at the left end of the front axle, human-computer interaction unit (not shown in the figure) and electrical control system ( Figure 2). The laser displacement sensors 4 and 14 are respectively connected with the carrying laser displacement sensor motors 6 and 12, and the carrying laser displacement sensor devices 3 and 16 are respectively connected with the laser displacement sensors 6 and 12 and the servo motor driving device (not shown in the figure). shown), used to measure the distance value between the front edge and the rear edge of the brake drum to obtain the toe-in value, and the brake drum rotating motor 11 is respectively connected with the servo motor drive devices 10, 9, 8 and 7 to complete the brake drum rotation. The position of the moving drum is rotated to match the correction and measurement of the toe-in value. The limit limit devices 2, 5, 13 and 15 are respectively connected with the laser displacement sensor measurement devices 4 and 14 for controlling the limit position of the motor movement and the motor. For the search operation of returning to the origin, the servo motor driver device is respectively connected with the carrying laser displacement sensor motors 6 and 12 and the brake drum rotating motor 11 for sending drive commands and receiving servo motor feedback information. The electrical control systems are respectively Toe-in value measurement device with laser displacement sensor (2, 3, 4, 5 and 13, 14, 15, 16), servo motor driver device (not shown in the figure), carrying laser displacement sensor motor (6 and 12), The brake drum rotating motor 11, the servo motor drive device (not shown in the figure), the human-computer interaction unit (not shown in the figure), and the pulse transmission unit (Figure 3) are electrically connected.

As shown in FIG. 2 , in another embodiment of the present invention, the electrical control system includes a system control board and a servo motor drive circuit, a power supply circuit, a reset circuit, a limit limit A bit circuit, a data processing module, a laser displacement sensor and a human-computer interaction unit; preferably, the system control board is an ARM Cortex-M series microprocessor, in this embodiment, an ARM Cortex-M3 series microprocessor. The motor drive circuit is respectively connected with the carrying laser displacement sensor motor and the brake drum rotating motor, the power circuit is connected with the control system and used to supply power to the system, and the reset circuit is electrically connected with the control board for the system Power-on reset, the limit limit circuit is respectively connected with the laser displacement sensor bearing motor and the brake drum rotating device, the laser displacement sensor is on the laser displacement sensor bearing motor, and the human-computer interaction unit communicates with all of them via the MODBUS RTU protocol. system control board communication. The user sets the model of the vehicle front axle and the toe-in value standard through the human-computer interaction unit. After the system control panel receives the user's operation instruction and meets the starting conditions, it starts the device and measures the toe-in value. Through the friendly human-computer interaction interface, users can choose the standard toe-in value corresponding to the type of front axle according to their own needs. In actual production, the standard toe-in value selection range is 1-3mm.

Preferably, the vehicle front axle toe-in value measurement device further includes a system protection unit, the system protection unit includes an overvoltage protection circuit connected to the control board and the motion control chip MCX314AL, using an optocoupler isolation chip PS2805- 4. Perform optocoupler electrical isolation and level conversion to prevent high level from burning out the control board and motion control chip.

Preferably, the vehicle front axle toe-in value measurement device further includes a data processing module, the data processing module includes a level conversion unit, a data bidirectional asynchronous transmission unit, and an analog-to-digital conversion (ADC) unit, the level conversion unit The unit is connected with the motion control chip for converting 24V voltage into 3.3V voltage, the data bidirectional asynchronous transmission unit is respectively connected with the control board and the laser displacement sensors 4 and 14, and the analog-to-digital conversion unit is respectively connected with the control board and the laser The displacement sensor is connected to convert the digital signal of the front beam value collected by the laser displacement sensor into an electrical signal.

Preferably, the device for measuring the toe-in value of the front axle of the vehicle further includes a motor return-to-origin unit, and the motor-to-origin unit includes a motor return-to-origin carrying a laser displacement sensor and a rotary brake drum motor return-to-origin. The origin point of the motor carrying the laser displacement sensor is that the motor carrying the laser displacement sensor is connected to the limit limit device. When the shading plate on the laser displacement sensor passes near the origin, the motor decelerates and continues to move to the origin, which is the point of the carrying laser The origin of the displacement sensor motor, the origin of the rotating brake drum motor is to compare the distance between the laser displacement sensor and the brake drum with the distance set by the system after the carrying laser displacement sensor returns to the origin, as shown in Figure 1. The left end measurement distance L1 is compared with the system setting distance L3, the right end measurement distance L2 is compared with the system setting distance L4, and then the brake drum motor is rotated to continuously correct the error to satisfy L1=L3; when L2=L4, the motor position is Rotate the motor origin for the brake drum.

As shown in FIG. 3, in another embodiment of the present utility model, the pulse transmission unit includes a pulse signal generator, a pulse signal differential driving circuit, and a pulse signal differential circuit receiving circuit, and the pulse signal generator uses The motion control chip MCX314AL is used as a processor, which is connected with the system control board and the pulse signal differential drive circuit respectively for the transmission of pulse signals and the reception and processing of motor feedback information. The pulse information differential drive circuit adopts the AM26LS31CD chip and the MCX314AL and It is connected to the servo motor driver for outgoing driving pulses. The pulse signal differential circuit receiving circuit is respectively connected to the servo motor driver and MCX314AL for receiving motor feedback information. The signal after passing through the differential circuit always maintains the differential form. Make the pulse signal more stable and accurate.

Preferably, the device for measuring the toe-in value of the front axle of the vehicle further includes a real-time detection unit for the toe-in value, and the real-time detection unit for the toe-in value adopts the laser displacement sensors (4 and 14) to collect the two ends of the front axle of the vehicle in real time. The position of the front edge and the rear edge of the brake drum, the brake drum rotating motor 11 rotates the brake drum rotating device to correct the actual toe-in value, and the toe-in value collected by the laser displacement sensor is processed by the data After the module performs data processing, it transmits the actual toe-in value information to the electrical control system in real time.

The utility model also provides a work flow corresponding to the vehicle front axle toe-in value measuring device described in the above solution, as shown in FIG. 4 , which specifically includes the following steps:

Step 1: Power on the system and start the system;

Step 2: The three servo motors are returned to the origin, and subsequent operations can be performed only after the servo motors return to the origin;

Step 3: Measure the toe-in value in real time, tighten the lock nut when the set standard toe-in value is met, and the measurement process is over. If the set condition is not met, the brake drum needs to be rotated to continue to measure the toe-in value until the set toe-in value is met. set conditions.

It should be understood that the application of the present utility model is not limited to the above-mentioned examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above descriptions. All these improvements and transformations should belong to the protection of the appended claims of the present utility model. scope.

Claims (8)

1. A vehicle front axle toe-in value measuring device is characterized in that, comprising a laser displacement sensor to measure the toe-in value device, a brake drum rotating device, a limit limit device, a servo motor drive device, a load-bearing laser displacement sensor motor, a system Drum rotating motor, human-computer interaction unit, pulse transmission unit, real-time detection unit of toe-in value, motor returning to origin unit and electrical control system; the device for measuring toe-in value of the laser displacement sensor is connected with the motor carrying the laser displacement sensor , the carrying laser displacement sensor device is respectively connected with the laser displacement sensor and the servo motor drive device, and is used to measure the distance value between the front edge and the rear edge of the brake drum to obtain the toe value, and the brake drum rotating motor is respectively connected with the servo motor The driving device is connected with the brake drum device to complete the position rotation of the brake drum to match the correction and measurement of the toe-in value, and the limit limit device is respectively connected with the laser measuring device and the brake drum rotating device for controlling The limit position of the motor movement and the search operation of the origin return, the servo motor driving device is respectively connected with the bearing laser displacement sensor motor and the brake drum rotating motor, for sending driving instructions and receiving servo motor feedback information, the electrical control system It is electrically connected with the laser displacement sensor toe-in value measuring device, the servo motor drive device, the bearing laser displacement sensor motor, the brake drum rotation motor, the servo motor drive device, the human-computer interaction unit, the pulse transmission unit, and the motor returning to the origin. 2. The vehicle front axle toe-in value measuring device according to claim 1, wherein the human-computer interaction unit communicates with the electrical control system via the MODBUS RTU protocol, and the electrical control system is an ARM Cortex-M3 A series of microprocessor STM32F103ZET6 chips. 3. The vehicle front axle toe-in value measuring device according to claim 1, wherein the pulse transmission unit comprises a pulse signal generator, a pulse signal differential drive circuit, and a pulse signal differential circuit receiving circuit, the The pulse signal generator uses the motion control chip MCX314AL as the processor, which is respectively connected with the system control board and the pulse signal differential drive circuit for the transmission of the pulse signal and the reception of the motor feedback information. The pulse signal differential drive circuit adopts the AM26LS31CD chip. It is respectively connected with MCX314AL and servo motor driver for driving pulse transmission, and the pulse signal differential circuit receiving circuit is respectively connected with servo motor driver and MCX314AL for receiving motor feedback information. 4. The vehicle front axle toe value measuring device according to claim 1, wherein the toe value real-time detection unit adopts the laser displacement sensor to collect the front edge and the rear of the brake drum at both ends of the vehicle front axle in real time. The position of the edge, the brake drum rotation motor rotates the brake drum device for correcting the actual toe value. 5. The vehicle front axle toe-in value measuring device according to claim 4, further comprising a data processing module, the data processing module comprising a level conversion unit, a data bidirectional asynchronous transmission unit, an analog-to-digital conversion (ADC) ) unit, the level conversion unit is connected with the motion control chip for converting 24V voltage into 3.3V voltage, the data bidirectional asynchronous transmission unit is respectively connected with the control board and the laser displacement sensor, and the analog-to-digital conversion unit is respectively It is connected with the control board and the laser displacement sensor, and is used to convert the digital signal of the front beam value collected by the laser displacement sensor into an electrical signal. 6. The vehicle front axle toe-in value measuring device according to claim 1, wherein the electrical control system comprises a system control board and a servo motor drive circuit, a power supply circuit, a reset circuit, a limit limit circuit, a data processing module, a laser displacement sensor and a human-computer interaction unit; the motor drive circuit is respectively connected with the motor carrying the laser displacement sensor and the rotating motor of the brake drum, and the power circuit is connected with the control system connected to supply power to the system, the reset circuit is connected to the control board for power-on reset of the system, the limit limit circuit is respectively connected with the laser displacement sensor carrying motor and the brake drum rotating device, the laser displacement sensor On the laser displacement sensor carrying motor. 7. The vehicle front axle toe-in value measuring device according to claim 6, further comprising a system protection unit, the system protection unit comprising an overvoltage protection circuit connected to the control board and the motion control chip MCX314AL , Use optocoupler isolation chip PS2805-4 for optocoupler electrical isolation and level conversion. 8 . The device for measuring the toe-in value of the front axle of an automobile according to claim 7 , further comprising a motor return-to-origin unit, and the motor-to-origin unit includes a motor-to-origin carrying a laser displacement sensor and a rotational brake. 9 . The drum motor returns to the origin, and the return-to-origin of the carrying laser displacement sensor motor is that the carrying laser displacement sensor motor is connected to the limit limiting device.

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