Electric power steering testing device for paddy field light power chassis

Abstract

The invention relates to the technical field of agricultural equipment testing, and discloses an electric power-assisted steering testing device for a paddy field light power chassis, which comprises a power-assisted steering mechanism, a steering transmission mechanism, a power transmission mechanism and a testing mechanism, the power-assisted steering mechanism is connected with the steering transmission mechanism, the steering transmission mechanism is connected with the power transmission mechanism, and the testing mechanism is connected with the power transmission mechanism. The power transmission mechanism and the power-assisted steering mechanism are connected with the testing mechanism. By carrying the electric power steering system, the steering performance is improved; the switching between manual steering and electric steering is added, the electric steering can accurately complete the steering action by sending an instruction of a corresponding steering angle, and the performance of the designed electric power steering system can be further explored; the device receives real-time test data through the sensor, feeds the data back to the display screen, simulates a real working environment, accurately tests and evaluates system performance, improves the development efficiency of a paddy field light power chassis EPS system, and has important research value and practical significance.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural equipment testing, in particular to an electric power steering testing device for a paddy field light power chassis. Background Art

[0002] With the continuous development of agricultural mechanization, paddy field operation machinery has become an important equipment for improving agricultural production efficiency. Among them, light power chassis are widely used in paddy field operations, which are light, flexible and adaptable. However, due to the complex paddy field operation environment, the ground is slippery and muddy, which puts higher requirements on the operability and stability of the machinery. Especially in terms of steering systems, traditional mechanical or hydraulic steering systems often have problems such as laborious operation, insensitive response, and easy fatigue, which is not conducive to long-term and efficient operation.

[0003] In order to solve the above problems, in recent years, electric power steering systems have been gradually introduced into light power chassis. The EPS system (Electronic Power Steering, a power steering system that relies on motors to provide auxiliary torque) uses motors as the power source and combines electronic control units to intelligently distribute steering force, which can not only reduce the operator's labor intensity, but also improve the vehicle's operating accuracy and safety. However, in order to ensure the reliability and applicability of the EPS system in the actual paddy field operation environment, it needs to be fully tested and verified.

[0004] The existing EPS system test bench is usually suitable for steering system testing of ordinary vehicles, but lacks a special design for the special needs of paddy field lightweight power chassis (such as high steering resistance in slippery environments and multi-angle steering requirements). Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above prior art and to provide an electric power steering test device for a paddy field light power chassis.

[0006] The object of the present invention is achieved through the following technical scheme: an electric power steering test device for a paddy field light power chassis comprises a power steering mechanism, a steering transmission mechanism, a power transmission mechanism and a testing mechanism, wherein the steering transmission mechanism comprises a steering structure and a power control structure, wherein the steering structure comprises a steering gear shaft, a sector gear, a rotating shaft, a steering fork and two steering transmission rods, wherein the power steering mechanism is connected to the steering gear shaft, wherein the steering gear shaft is meshed with the sector gear, wherein the sector gear is connected to the steering fork through the rotating shaft, wherein both sides of the steering fork are respectively hinged to one end of the two steering transmission rods, wherein the other ends of the two steering transmission rods are respectively connected to the two front wheel power output ends of the power transmission mechanism, wherein the steering fork is respectively connected to the two rear wheel power output ends of the power transmission mechanism through the power control structure, and wherein the power transmission mechanism and the power steering mechanism are both connected to the testing mechanism.

[0007] A better choice is that the power steering mechanism includes a steering wheel, a steering motor, a steering column, an electric power-assisted motor and a power-assisted gear, the steering wheel and the steering motor are both connected to one end of the steering column, the electric power-assisted motor and the power-assisted gear are both installed on the steering column, the electric power-assisted motor is connected to the power-assisted gear, the other end of the steering column is connected to the steering structure, and the steering motor and the electric power-assisted motor are both connected to the testing mechanism.

[0008] A better choice is that the power control structure includes two pull rods, two connecting rods, two gear adjustment rods and two power input shafts, the two sides of the steering fork are respectively hinged to one end of the two pull rods, the other end of the two pull rods is hinged to one end of the two connecting rods, the other end of the two connecting rods is fixedly connected to the two gear adjustment rods, the two gear adjustment rods are rotatably connected to the two power input shafts, and the bevel teeth of the two power input shafts match the two rear wheel power output ends.

[0009] A better choice is that the power transmission mechanism includes a reverse rotating transmission shaft, two steering front axle boxes and two blade wheels, two convex gears are provided in the middle of the reverse rotating transmission shaft, the two convex gears are respectively matched with the bevel teeth of the two power input shafts, the two ends of the reverse rotating transmission shaft are connected to the upper end of the steering front axle boxes through bevel teeth, the lower ends of the two steering front axle boxes are connected to the two blade wheels, the tops of the two steering front axle boxes are connected to the testing mechanism, and the sides of the two steering front axle boxes are respectively hinged to the two steering transmission rods.

[0010] A more preferred option also includes a gearbox, which is meshed with the counter-rotating transmission shaft through gears.

[0011] A better choice is that the testing mechanism includes a display, a sensor module, a signal acquisition system, a motor driver, a main control unit and a frame, the power transmission mechanism is installed on the frame, the sensor module is respectively installed on the power steering mechanism and the power transmission mechanism, the sensor module is connected to the signal acquisition system, the signal acquisition system is connected to the main control unit through a communication module, the power steering mechanism is connected to the main control unit through the motor driver, and the main control unit is connected to the display.

[0012] A better option is that the signal acquisition system includes a digital communication module, a real-time processing unit and a signal acquisition module, the sensor module is connected to the real-time processing unit via the digital communication module, and the real-time processing unit is connected to the communication module.

[0013] A better choice is that the sensor module includes a rotation angle sensor, a torque sensor and an angle sensor, the rotation angle sensor is installed on the steering motor, the torque sensor is installed on the steering column, and the angle sensor is installed on the steering front axle box of the power transmission mechanism, and the rotation angle sensor, the torque sensor and the angle sensor are all connected to the signal acquisition system.

[0014] A better choice, the frame includes a front frame, a side frame, a bottom frame, a bushing and a lifting platform, the front frame is installed on the top of the bottom frame, the display is installed on the front frame, the side frames are installed on both sides of the front frame, the power transmission mechanism is installed on the top of the side frame through the bushing, and the lifting platform is installed on the outside of the side frame.

[0015] A better option is that the lifting platform includes a lifting rod, a bearing plate and a base, the lifting rod is installed on the bottom frame through the base, and the top of the lifting rod is connected to the bottom of the bearing plate.

[0016] The present invention has the following advantages and beneficial effects compared with the prior art:

[0017] The present invention can simulate the real working environment, accurately test and evaluate the system performance through the power steering mechanism, steering transmission mechanism, power transmission mechanism and testing mechanism, which has important research value and practical significance. This testing device can not only improve the development efficiency of the EPS system, but also provide reliable technical support for future intelligent paddy field operation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of an electric power steering test device for a paddy field light power chassis of the present invention;

[0019] Figure 2It is a schematic diagram of the assembly of the power steering mechanism, steering transmission mechanism and power transmission mechanism of the electric power steering test device for paddy field light power chassis of the present invention;

[0020] Figure 3 It is a left side view of the assembly of the power steering mechanism, the steering transmission mechanism and the power transmission mechanism of the electric power steering test device for the paddy field light power chassis of the present invention;

[0021] Figure 4 It is an assembly schematic diagram of the steering transmission mechanism and the power transmission mechanism of the electric power steering test device for the paddy field light power chassis of the present invention;

[0022] Figure 5 It is a schematic diagram of a steering transmission mechanism of an electric power steering test device for a paddy field light power chassis of the present invention;

[0023] Figure 6 It is a schematic diagram of a testing mechanism of an electric power steering testing device for a paddy field light power chassis of the present invention;

[0024] Figure 7 yes Figure 6 A local enlarged schematic diagram at point A;

[0025] Figure 8 It is a schematic diagram of electronic component connection of an electric power steering test device for a paddy field light power chassis of the present invention;

[0026] The markings of the components in the attached drawings are as follows: 1-power steering mechanism; 101-steering wheel; 102-steering motor; 103-steering column; 104-electric power motor; 105-power gear; 2-steering transmission mechanism; 21-steering structure; 211-steering gear shaft; 212-sector gear; 213-rotating shaft; 214-steering fork; 215-steering transmission rod; 22-power control structure; 221-pull rod; 222-connecting rod; 223-gear adjustment rod; 224-power output Into the shaft; 23-protective shell; 3-power transmission mechanism; 301-gearbox; 302-reverse rotation drive shaft; 303-steering front axle box; 304-blade wheel; 4-testing mechanism; 41-display; 42-sensor module; 421-angle sensor; 422-torque sensor; 43-frame; 431-front frame; 432-side frame; 433-bottom frame; 434-sleeve; 435-lifting platform; 435a-carrying plate; 435b-lifting rod; 435c-base. DETAILED DESCRIPTION

[0027] The purpose of the present invention is further described in detail below with reference to the accompanying drawings and specific examples. The examples cannot be described one by one here, but the implementation methods of the present invention are not therefore limited to the following examples.

[0028] like Figure 1 As shown, the electric power steering test device for a paddy field light power chassis includes a power steering mechanism 1, a steering transmission mechanism 2, a power transmission mechanism 3 and a test mechanism 4. The lower end of the power steering mechanism 1 is connected to the steering transmission mechanism 2, the rotation transmission mechanism is connected to the power transmission mechanism 3, and the power transmission mechanism 3 is installed on the test mechanism 4. The power steering mechanism 1 and the power transmission mechanism 3 are both connected to the test mechanism 4.

[0029] The power steering mechanism 1 can realize the switching between automatic driving and manual driving. In the automatic driving mode, the host computer can issue instructions to drive the power steering motor to execute, so as to complete the steering angle and steering force instructions issued to ensure the accuracy and reliability of the power steering mechanism 1. The steering transmission mechanism 2 is used to play a transmission role when the operator turns. The power transmission mechanism 3 is used to control the transmission of power to achieve in-situ steering. The test mechanism 4 is used to collect test data and control the power steering mechanism 1.

[0030] like Figure 2 and 3 As shown, the power steering mechanism 1 includes a steering wheel 101, a steering motor 102, a steering column 103, an electric power motor 104 and a power gear 105. The steering wheel 101 and the steering motor 102 are both connected to the upper end of the steering column 103, the electric power motor 104 and the power gear 105 are both installed on the steering column 103, and the electric power motor 104 is connected to the power gear 105. The lower end of the steering column 103 is connected to the steering gear shaft 211 of the steering transmission mechanism 2. The electric power motor 104 and the steering motor 102 are both connected to the main control unit of the test mechanism 4 through the motor driver.

[0031] The steering wheel 101 is used for manual rotation by the operator. The steering motor 102 is used to realize remote control of driving steering, reducing labor intensity. The electric power motor 104 is used to provide power for the rotation of the steering column 103, reducing the labor intensity of the operator. The power gear 105 is used to reduce the rotation speed of the electric power motor 104.

[0032] like Figure 2-4As shown, the steering transmission mechanism 2 includes a steering structure 21 and a power control structure 22. The steering structure 21 includes a steering gear shaft 211, a sector gear 212, a rotating shaft 213, a steering fork 214, two steering transmission rods 215 and a protective shell 23. The power control structure 22 includes two pull rods 221, two connecting rods 222, two gear adjustment rods 223 and two rear wheel power output shafts 224. The lower end of the steering column 103 of the power steering mechanism 1 is connected to the upper end of the steering gear shaft 211. A gear is provided at the lower end of the steering gear shaft 211, and the gear is meshed with the sector gear 212. The rotating shaft 213 is rotatably mounted on the protective shell 23. The sector gear 212 is fixedly sleeved on the middle part of the rotating shaft 213, and the lower end of the rotating shaft 213 is fixedly connected to the steering fork 214. The front two sides of the steering fork 214 are respectively hinged to one end of the two steering transmission rods 215. The other ends of the two steering transmission rods 215 are respectively connected to the two front wheel power output ends (i.e., the two steering front axle boxes 303) of the power transmission mechanism 3. The rear two sides of the steering fork 214 are respectively hinged through one end of two pull rods 221, the other ends of the two pull rods 221 are respectively hinged to one end of two connecting rods 222, the other ends of the two connecting rods 222 are respectively fixedly connected to the lower ends of two gear adjustment rods 223, the two gear adjustment rods 223 can rotate by themselves, thereby respectively pushing the two rear wheel power output shafts 224 to move forward and backward, and the front ends of the two rear wheel power output shafts 224 are both provided with bevel teeth, and the two bevel teeth match the two convex gears on the reverse rotating transmission shaft 302 of the power transmission mechanism 3.

[0033] The steering structure 21 is used to transmit the kinetic energy of the steering column 103 to the steering front axle box 303 of the power transmission mechanism 3, so as to control the steering of the blade wheel 304. The power control structure 22 is used to control the two power inputs of the counter-rotating transmission shaft 302 on the power transmission mechanism 3, so as to realize the in-situ steering. The steering gear shaft 211 is used to transmit the kinetic energy of the steering column 103 to the fan gear 212. The fan gear 212 is used to transmit the kinetic energy of the steering gear shaft 211 to the rotating shaft 213. The rotating shaft 213 is used to transmit the kinetic energy of the fan gear 212 to the steering fork 214. The steering fork 214 is used to pull two steering transmission rods 215 and two pull rods 221. The steering transmission rod 215 is used to pull the steering front axle box 303 to rotate, so as to adjust the steering angle of the blade wheel 304. The protective shell 23 is used to protect the internal parts. The pull rod 221 plays a transmission role and is used to pull the connecting rod 222. The connecting rod 222 is used to rotate the gear adjustment rod 223. The gear adjustment rod 223 is used to push or release the rear wheel power output shaft 224 by rotating itself, so as to achieve contact and separation between the rear wheel power output shaft 224 and the reverse rotation transmission shaft 302. The rear wheel power output shaft 224 is used to output the power of the reverse rotation transmission shaft 302 to the rear wheel (not shown in the figure) as power.

[0034] like Figure 4 As shown, the power transmission mechanism 3 includes a gearbox 301, a reverse rotating transmission shaft 302, two steering front axle boxes 303 and two blade wheels 304. Two convex gears are provided in the middle of the reverse rotating transmission shaft 302, and the two convex gears are matched with the bevel teeth of the two rear wheel power output shafts 224 respectively. A large gear is provided between the two convex gears, and the large gear is connected to the gearbox 301, and the gearbox 301 is used to output power outward. The two ends of the reverse rotating transmission shaft 302 are connected to the upper end of the steering front axle box 303 through bevel teeth, and the lower ends of the two steering front axle boxes 303 are connected to the two blade wheels 304. The tops of the two steering front axle boxes 303 are connected to the angle sensor 421 of the testing mechanism 4. The sides of the two steering front axle boxes 303 are respectively hinged to the two steering transmission rods 215.

[0035] The gearbox 301 is used to change the speed of the kinetic energy of the reverse rotating transmission shaft 302 and transmit it to the external device for use. The reverse rotating transmission shaft 302 can be purchased in the existing market. When moving in a straight line, the two rear wheel power output shafts 224 allow the two rear wheels to rotate at the same time, thereby increasing the forward power of the device; when the steering wheel 101 turns left, the reverse rotating transmission shaft 302 engages with the rear wheel power output shaft 224 on the right side, providing power for the rear wheel on the right side, allowing the device to turn left faster; when the steering wheel 101 turns right, the reverse rotating transmission shaft 302 engages with the rear wheel power output shaft 224 on the left side, providing power for the rear wheel on the left side, allowing the device to turn right faster. The steering front axle box 303 is used to change the transmission direction of power, transmit power to the blade wheel 304, and can rotate under the pull of the steering transmission rod 215, thereby driving the blade wheel 304 to turn. The blade wheel 304 is used to increase the resistance with the ground.

[0036] like Figure 6-8 As shown, the test mechanism 4 includes a display 41, a sensor module 42, a signal acquisition system and a frame 43. The signal acquisition system includes a digital communication module, a real-time processing unit and a signal acquisition module. The sensor module 42 includes a rotation angle sensor, a torque sensor 422 and an angle sensor 421. The rotation angle sensor is installed on the steering motor 102, the torque sensor 422 is installed on the steering column 103, and the angle sensor 421 is installed on the top of the steering front axle box 303 of the power transmission mechanism 3. The rotation angle sensor, the torque sensor 422 and the angle sensor 421 are all connected to the digital communication module. The digital communication module is connected to the real-time processing unit. The real-time processing unit is connected to the main control unit through the communication module. The main control unit is connected to the display 41.

[0037] The display 41 is used to display the test results of the real-time monitoring auxiliary device. The sensor module 42 is used to collect the angle data of the steering wheel 101, the torque of the steering column 103 and the rotation angle of the steering front axle box 303. The signal acquisition system is used to collect the data of the sensor. The frame 43 is used to fix each mechanism. The digital communication module is used to convert the signal of the sensor into digital data. The communication module is used to transmit the information of the real-time processing unit to the main control unit. The real-time processing unit is used to process digital data. The angle sensor is used to collect the angle data of the steering wheel 101. The torque sensor 422 is used to collect the torque size of the steering column 103. The angle sensor 421 is used to collect the rotation angle of the steering front axle box 303.

[0038] like Figure 6 and 7 As shown, the frame 43 includes a front frame 431, two side frames 432, a bottom frame 433, two shaft sleeves 434 and two lifting platforms 435; each lifting platform 435 includes four lifting rods 435b, a bearing plate 435a and a base 435c. The front frame 431 is installed at the top front of the bottom frame 433, and the display 41 is installed on the top of the front frame 431. The two side frames 432 are respectively installed on the left and right sides of the bottom frame 433, and the two ends of the reverse rotation transmission shaft 302 of the power transmission mechanism 3 are installed on the top of the side frames 432 through the shaft sleeves 434. The two bases 435c are respectively installed on the left and right sides of the top of the bottom frame 433, and are located on the outside of the two side frames 432. Eight lifting rods 435b are respectively installed on the top of the two bases 435c, and the tops of every four lifting rods 435b are connected to a bearing plate 435a.

[0039] The front frame 431 is used to install and fix the display 41. The side frame 432 is used to support the power transmission mechanism 3. The bottom frame 433 is used to bear weight and increase the force-bearing area. The shaft sleeve 434 is used to fix the power transmission mechanism 3. The lifting platform 435 is used to lift the simulation device to increase the resistance of the blade wheel 304 and the simulation device, realize the resistance of the paddy field or dry land, and thus realize the function of simulating the steering resistance torque under different working conditions.

[0040] The electric power steering test device for paddy field light power chassis in this embodiment has the following advantages:

[0041] 1. This test device reduces energy consumption. Compared with traditional hydraulic power steering, electric power steering can reduce energy consumption and protect the environment.

[0042] 2. This test device can improve the performance of the steering system. Traditional mechanical or hydraulic steering systems often have problems such as laborious operation, slow response, and easy fatigue, which are not conducive to long-term and efficient operation. The electric power steering system can make up for this shortcoming.

[0043] 3. In the current existing research, there is no test device for the paddy field light power chassis steering system. The design of this test device can help to carry out future research related to the power chassis, and it can also be combined with other aspects such as suspension for joint research.

[0044] 4. The test device can simulate the steering resistance torque under different working conditions such as road surface, paddy field and dry land, and can conduct test experiments more conveniently and reduce costs.

[0045] 5. This test device adds the switching between manual steering and electric steering. The electric steering can achieve the desired steering angle by issuing instructions and accurately completing the steering action, which facilitates further exploration of the performance of the designed electric power steering system.

[0046] The above specific implementation modes are preferred embodiments of the present invention and cannot be used to limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. Electric power steering test device for paddy field light power chassis, characterized by: It includes a power steering mechanism, a steering transmission mechanism, a power transmission mechanism and a testing mechanism. The steering transmission mechanism includes a steering structure and a power control structure. The steering structure includes a steering gear shaft, a sector gear, a rotating shaft, a steering fork and two steering transmission rods. The power steering mechanism is connected to the steering gear shaft, the steering gear shaft is meshed with the sector gear, the sector gear is connected to the steering fork through the rotating shaft, the two sides of the steering fork are respectively hinged to one end of the two steering transmission rods, the other ends of the two steering transmission rods are respectively connected to the two front wheel power output ends of the power transmission mechanism, the steering fork is respectively connected to the two rear wheel power output ends of the power transmission mechanism through the power control structure, and the power transmission mechanism and the power steering mechanism are both connected to the testing mechanism.

2. The electric power steering test device for paddy field light power chassis according to claim 1, characterized in that: The power steering mechanism includes a steering wheel, a steering motor, a steering column, an electric power-assisted motor and a power-assisted gear. The steering wheel and the steering motor are both connected to one end of the steering column. The electric power-assisted motor and the power-assisted gear are both installed on the steering column. The electric power-assisted motor is connected to the power-assisted gear. The other end of the steering column is connected to the steering structure. The steering motor and the electric power-assisted motor are both connected to the testing mechanism.

3. The electric power steering test device for paddy field light power chassis according to claim 1, characterized in that: The power control structure includes two pull rods, two connecting rods, two gear adjustment rods and two power input shafts. The two sides of the steering fork are respectively hinged to one end of the two pull rods, the other end of the two pull rods is hinged to one end of the two connecting rods, the other end of the two connecting rods is fixedly connected to the two gear adjustment rods, the two gear adjustment rods are rotatably connected to the two power input shafts, and the bevel teeth of the two power input shafts match the two rear wheel power output ends.

4. The electric power steering test device for paddy field light power chassis according to claim 3, characterized in that: The power transmission mechanism includes a reverse rotating transmission shaft, two steering front axle boxes and two blade wheels. Two convex gears are provided in the middle of the reverse rotating transmission shaft. The two convex gears are respectively matched with the bevel teeth of the two power input shafts. The two ends of the reverse rotating transmission shaft are connected to the upper end of the steering front axle boxes through bevel teeth, the lower ends of the two steering front axle boxes are connected to the two blade wheels, the tops of the two steering front axle boxes are connected to the testing mechanism, and the sides of the two steering front axle boxes are respectively hinged to the two steering transmission rods.

5. The electric power steering test device for paddy field light power chassis according to claim 4, characterized in that: Also included is a gearbox meshed with the counter-rotating drive shafts via gears.

6. The electric power steering test device for a paddy field light power chassis according to claim 1, characterized in that: The testing mechanism includes a display, a sensor module, a signal acquisition system, a motor driver, a main control unit and a frame. The power transmission mechanism is installed on the frame. The sensor module is respectively installed on the power steering mechanism and the power transmission mechanism. The sensor module is connected to the signal acquisition system. The signal acquisition system is connected to the main control unit through a communication module. The power steering mechanism is connected to the main control unit through the motor driver. The main control unit is connected to the display.

7. The electric power steering test device for a paddy field light power chassis according to claim 6, characterized in that: The signal acquisition system comprises a digital communication module, a real-time processing unit and a signal acquisition module. The sensor module is connected to the real-time processing unit via the digital communication module, and the real-time processing unit is connected to the communication module.

8. The electric power steering test device for a paddy field light power chassis according to claim 6, characterized in that: The sensor module includes a rotation angle sensor, a torque sensor and an angle sensor. The rotation angle sensor is installed on the steering motor, the torque sensor is installed on the steering column, and the angle sensor is installed on the steering front axle box of the power transmission mechanism. The rotation angle sensor, the torque sensor and the angle sensor are all connected to the signal acquisition system.

9. The electric power steering test device for a paddy field light power chassis according to claim 6, characterized in that: The frame includes a front frame, a side frame, a bottom frame, a shaft sleeve and a lifting platform. The front frame is installed on the top of the bottom frame, the display is installed on the front frame, the side frames are installed on both sides of the front frame, the power transmission mechanism is installed on the top of the side frame through the shaft sleeve, and the lifting platform is installed on the outside of the side frame.

10. The electric power steering test device for paddy field light power chassis according to claim 9, characterized in that: The lifting platform comprises a lifting rod, a bearing plate and a base, the lifting rod is installed on the bottom frame through the base, and the top of the lifting rod is connected to the bottom of the bearing plate.

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