Operating force testing device for hydrostatic transmission

Abstract

The utility model discloses an operating force testing device for a hydrostatic transmission. The testing device comprises a driving module, a worm and gear transmission module I and an HST testing module II. The worm and gear transmission module I is controlled by a microcontroller in the driving module, under the control of the microcontroller, a motor is driven by a TTL-to-RS485 module and a motor driver to output power to drive a worm and gear to rotate, and the rotating angle is controlled by means of an angle sensor in a closed-loop mode; and in the HST test module II, a series of holding torque values under different loads are obtained by using a torque sensor, and the data are processed and analyzed to obtain the operating force characteristics of the hydrostatic transmission device.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the operating force test technical field, concretely relates to a kind of operating force testing device for hydrostatic transmission. BACKGROUND

[0002] Hydrostatic transmission is used to transmit power between engine and final drive of agricultural machinery. Hydrostatic transmission is mainly composed of oil pump, hydraulic motor and pipeline. Its working principle is that engine drives variable pump to make the working oil in high pressure end of closed system pressurize, and the pressure oil flows to hydraulic motor through pipeline.

[0003] During the working process of hydrostatic transmission, the variable pump part needs to change the displacement by adjusting the angle of swash plate, and then change the flow of output oil, to realize the function of hydraulic stepless speed change. Hydrostatic transmission has wide application range, and is commonly used in harvester, mining truck, loader, automatic vibrating road roller and the like. In military field, it is used in armored vehicle, self-propelled artillery and the like. Vehicles equipped with hydrostatic transmission system have high traction force under heavy load, and can have high driving speed under light load. The controllable angle of hydrostatic transmission system is usually about 45°, which includes forward, stop and reverse, three segments, and the operator needs to maintain stable operating position. However, the operating force of mechanical variable hydrostatic transmission system is large and unstable with load change, which causes large labor intensity to the driver.

[0004] Therefore, an operating force testing device for hydrostatic transmission is designed to realize the analysis and measurement of resistance characteristics of hydrostatic transmission device. By adjusting the speed of motor, the angle of swash plate is measured by angle sensor, and the corresponding torque is measured by force sensor at corresponding angle. Through the analysis of operating force, the required power, torque and working speed of electric control operating mechanism can be determined.

[0005] The operating force testing device for hydrostatic transmission designed in the application is very necessary for the application of hydrostatic transmission device. CONTENT OF UTILITY MODEL

[0006] Therefore, the utility model wants to solve the technical problem to provide a kind of operating force testing device for hydrostatic transmission, the purpose is to obtain the basic data required for changing hydrostatic transmission device (HST) from manual mechanical control to motor-driven automatic control, to avoid the problem of lack of operating force analysis device for hydrostatic transmission in the past.

[0007] In order to solve the above technical problems, the utility model discloses a kind of operating force testing device for hydrostatic transmission, it includes drive module, worm gear drive module I, HST test module II, drive module is composed of microcontroller and motor, motor output power drives worm gear drive module I;HST test module II has angle sensor and torque sensor, wherein angle sensor and torque sensor connect worm gear drive module I.

[0008] According to the utility model one embodiment, wherein the motor speed required by above-mentioned microcontroller is input, signal is given motor driver by TTL to RS485 module again, and motor output power drives worm gear rotation in worm gear drive module I.

[0009] According to the utility model one embodiment, wherein above-mentioned worm gear drive module I includes worm gear, bearing and shell;Worm wheel is connected with shell by bearing, realizes the fixation and rotation of worm wheel;Worm is connected with shell by bearing, realizes the fixation and rotation of worm.

[0010] According to the utility model one embodiment, wherein above-mentioned HST test module II also includes shaft sleeve, HST, signal amplifier, data acquisition card;Wherein angle sensor is connected with worm;Torque sensor is connected with worm wheel and shaft sleeve, and the swash plate of HST is connected with shaft sleeve;Shaft sleeve is fixed with shell and worm wheel by bearing, so that worm gear keeps relative position unchanged.

[0011] According to the utility model one embodiment, wherein above-mentioned torque sensor outputs analog signal, and signal amplifier exports analog signal into data acquisition card, and data acquisition card converts analog signal into digital signal, and then is connected with computer to obtain data.

[0012] Compared with prior art, the utility model can obtain including following technical effects:

[0013] Force and angle data are accurate, and the relationship between force and angle can be found by collecting and counting with computer. The data function relationship of the rotation angle of control device converted into torque output to HST can be easily researched. The data measured by the utility model can be more instantaneous and stable by replacing hand.

[0014] Of course, any product implementing the utility model does not necessarily need to achieve all the technical effects described above. DRAWINGS

[0015] The drawings explained herein are used to provide further understanding of the utility model, and constitute a part of the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute improper limitation to the utility model. In the drawings:

[0016] Figure 1 This is a perspective view of the operating force testing device for a hydrostatic transmission according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram showing the connection between the drive module and the worm gear transmission module I according to an embodiment of this utility model;

[0018] Figure 3 This is a side view of the operating force testing device for a hydrostatic transmission according to an embodiment of the present invention;

[0019] Figure 4 This is a test flowchart of an embodiment of the present invention.

[0020] Attached Figure Labels

[0021] I. Worm Gear Drive Module; II. HST Test Module; 1. Motor; 2. Worm Gear Device; 3. Torque Sensor; 4. HST. Detailed Implementation

[0022] The following will describe in detail the implementation of this utility model with reference to the accompanying drawings and embodiments, so that the implementation of this utility model can be fully understood and carried out based on how technical means are used to solve technical problems and achieve technical effects.

[0023] Please refer to Figures 1 to 4 , Figure 1 This is a perspective view of the operating force testing device for a hydrostatic transmission according to an embodiment of the present invention; Figure 2 This is a schematic diagram showing the connection between the drive module and the worm gear transmission module I according to an embodiment of this utility model; Figure 3 This is a side view of the operating force testing device for a hydrostatic transmission according to an embodiment of the present invention; Figure 4 This is a test flowchart of an embodiment of the present invention.

[0024] As shown in the figure, a device for testing the operating force of a hydrostatic transmission includes a drive module, a worm gear transmission module I, and an HST test module II.

[0025] The driving module is composed of a microcontroller, a TTL-to-RS485 module, a motor driver, and a direct-current brushless inductive motor 1 (with an angle sensor). A relevant program is written to enable the microcontroller to control the motor driver through the TTL-to-RS485 module, drive the direct-current brushless inductive motor to rotate, and drive the worm connected thereto to rotate, the worm replacing the turbine to rotate at a transmission ratio of 128, providing sufficient torque for the experiment; the angle sensor in the motor records the angle information of the worm rotation and transmits it back to the motor driver, and then to the computer through the motor driver, completing the collection of angle data. The microcontroller is a single-chip microcomputer that integrates the main parts of a microcomputer on a chip, which can be selected from conventional single-chip microcomputers on the market.

[0026] The worm gear transmission module I includes a worm gear, a worm, a housing, and a bearing. The driving module inputs power to the worm, which drives the worm gear to rotate as the driving part. The transmission ratio of the two is as high as 128:1, so the torque of the worm gear is large enough to generate sufficient torque to twist the HST, causing the change of the static hydraulic transmission ratio.

[0027] The HST test module II includes an angle sensor, a torque sensor, a shaft sleeve, an HST, a signal amplifier, and a data acquisition card. The angle sensor is connected to the worm, and the torque sensor is connected to the worm gear and the shaft sleeve. The worm gear transmission module is connected to the torque sensor and then to the HST. The torque generated by the worm gear transmission module is measured by the torque sensor, the signal is amplified by the signal amplifier, the data obtained is integrated and collected by the data acquisition card, and finally the data is transmitted to the computer. The obtained torque data and the angle data measured by the angle sensor are compared to obtain the relationship between the twisting angle and the generated torque. The obtained relationship is used to design the automatic control of the automatic shifting function of the HST static hydraulic transmission, i.e., to obtain the rotation angle required by the worm according to the required rotation angle of the shifting transmission ratio, to realize automatic control.

[0028] Specifically, the worm gear transmission module I is controlled by the microcontroller in the driving module. Under the control of the microcontroller, the motor driver drives the motor 1 to output power to drive the worm gear 2 to rotate, and the rotation angle is controlled by the angle sensor in a closed loop. In the HST test module I, a series of holding torque values under different loads are obtained by using the torque sensor 3. By processing and analyzing these data, the operating force characteristics of the static hydraulic transmission device are obtained.

[0029] The driving module is controlled by the microcontroller, signals are transmitted to the motor driver, power is generated by the motor 1, and the worm gear 2 is driven to rotate; the swash plate of the HST 4 is connected with the torque sensor 3 through the shaft sleeve, and then the experimental power is provided by driving the worm gear 2 through the motor 1; the HST test module II utilizes the angle sensor and the torque sensor 3 to obtain a series of swash plate angles and the data of the holding torque, processes the data, and analyzes to obtain the operating force characteristics of the hydrostatic transmission device; the worm gear module I is fixed by the bearing and the shell, the worm gear is fixed by the bearing and the shell and the shaft sleeve, and the relative position of the worm gear is kept unchanged; the angle sensor of the driving module is in the motor 1; the swash plate of the HST 4 of the HST test module II is connected with the shaft sleeve.

[0030] The worm gear rotation module I has the worm gear device 2, bearings and a shell; the worm gear is connected with the shell through the bearing, so that the fixation and rotation of the worm gear are realized; the worm is connected with the shell through the bearing, so that the fixation and rotation of the worm are realized. The shell is divided into an upper shell and a lower shell, and the upper shell and the lower shell are connected and fixed through screws. The HST test module II comprises an angle sensor, a torque sensor 3, a shaft sleeve, an HST 4, a signal amplifier and a data acquisition card; the angle sensor is connected with the worm; the torque sensor is connected with the worm gear and the shaft sleeve, and measures the holding torque; the swash plate of the HST 4 is connected with the shaft sleeve. The torque sensor is connected with the signal amplifier to output an analog signal, the signal amplifier outputs the analog signal to the data acquisition card, the data acquisition card converts the analog signal into a digital signal, and then the digital signal is connected with a computer to obtain data.

[0031] The specific operation process is that the force sensor is fixed on the operating part, the output signal of the force sensor is calibrated, the operator applies force, the size and change curve of the operating force are recorded in real time, and the operating performance (such as the peak value, average value and dynamic response of the force) is evaluated through data analysis.

[0032] In conclusion, the force and angle data measured by the utility model are accurate, the relationship between the force and the angle can be found by collecting and counting the data by the computer, the function relationship of the rotation angle of the control device converted into the torque output to the HST can be conveniently researched, and the data measured by the utility model can be more timely and stable.

[0033] The above description shows and describes several preferred embodiments of the utility model, but as described above, it should be understood that the utility model is not limited to the forms disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified by the above-mentioned teaching or related technical or knowledge within the scope of the utility model concept described herein. The modification and change made by the person skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the protection scope of the claims attached to the utility model.

Claims

1. A kind of operating force testing device for hydrostatic transmission, comprising drive module, worm gear drive module I, HST test module II, it is characterized in that: The driving module is composed of a microcontroller and a motor, the motor outputs power to drive the worm gear transmission module I; the HST test module II is provided with an angle sensor and a torque sensor, wherein the angle sensor and the torque sensor are connected to the worm gear transmission module I.

2. A handling force testing device for a hydrostatic transmission according to claim 1, characterized in that The microcontroller inputs the required motor rotating speed, and then the signal is transmitted to the motor driver through a TTL to RS485 module, and the motor outputs power to drive the worm gear in the worm gear transmission module I to rotate.

3. A handling force testing device for a hydrostatic transmission according to claim 1, characterized in that The worm gear transmission module I comprises a worm gear, a bearing and a shell, the worm gear is connected to the shell through the bearing to realize the fixation and rotation of the worm gear, and the worm is connected to the shell through the bearing to realize the fixation and rotation of the worm.

4. A handling force testing device for a hydrostatic transmission according to claim 3, characterized in that The HST test module II further comprises a shaft sleeve, an HST, a signal amplifier and a data acquisition card, the angle sensor is connected to the worm, the torque sensor is connected to the worm gear and the shaft sleeve, the swash plate of the HST is connected to the shaft sleeve, and the shaft sleeve is fixed to the shell and the worm gear through the bearing to keep the relative position of the worm gear unchanged.

5. A handling force testing device for a hydrostatic transmission according to claim 4, characterized in that The torque sensor outputs an analog signal, the signal amplifier inputs the analog signal into the data acquisition card, the data acquisition card converts the analog signal into a digital signal, and then the digital signal is connected to a computer to obtain data.

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