Electric power steering test device for light power chassis of paddy field

Abstract

The present application relates to the technical field of agricultural equipment testing, and discloses a power-assisted steering test 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 test 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 power transmission mechanism and the power-assisted steering mechanism are both connected with the test mechanism. The electric power-assisted steering system is mounted to improve the steering performance. The manual steering and the electric steering are switched, the electric steering can realize the steering action by issuing the corresponding steering angle instruction, the steering action is accurately completed, and the performance of the designed electric power-assisted steering system is further explored. The device receives real-time test data feedback on the display screen through the sensor, realizes the simulation of the real working environment, the accurate test and the evaluation of the system performance, improves the development efficiency of the EPS system of the paddy field light power chassis, and has important research value and practical significance.

Description

Technical Field

[0001] This invention relates to the technical field of agricultural equipment testing, and more particularly to an electric power steering testing device for a light-duty power chassis used in paddy fields. Background Technology

[0002] With the continuous development of agricultural mechanization, paddy field machinery has become an important piece of equipment for improving agricultural production efficiency. Among them, lightweight power chassis are widely used in paddy field operations, characterized by their portability, flexibility, and adaptability. However, due to the complex environment of paddy field operations, with slippery and muddy ground, higher requirements are placed on the operability and stability of the machinery. Especially in terms of steering systems, traditional mechanical or hydraulic steering systems often suffer from problems such as laborious operation, unresponsiveness, and fatigue, which are not conducive to long-term, efficient operation.

[0003] To address the aforementioned issues, electric power steering systems have been increasingly introduced into lightweight chassis in recent years. EPS (Electronic Power Steering) systems use an electric motor as the power source, combined with an electronic control unit to intelligently distribute steering force. This not only reduces the operator's workload but also improves vehicle handling precision and safety. However, to ensure the reliability and applicability of EPS systems in actual paddy field operations, comprehensive testing and verification are necessary.

[0004] Existing EPS system test benches are generally suitable for testing the steering systems of ordinary vehicles, but lack special designs for the special needs of paddy field light power chassis (such as high steering resistance in wet and slippery environments and multi-angle steering requirements). Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to provide an electric power steering testing device for a light-duty power chassis used in paddy fields.

[0006] The objective of this invention is achieved through the following technical solution: An electric power steering testing device for a light-duty power chassis used in paddy fields 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, which meshes with the sector gear. The sector gear is connected to the steering fork via the rotating shaft. Both sides of the steering fork are hinged to one end of each of the two steering transmission rods. The other ends of the two steering transmission rods are connected to the two front wheel power output ends of the power transmission mechanism. The steering fork is connected to the two rear wheel power output ends of the power transmission mechanism via the power control structure. Both the power transmission mechanism and the power steering mechanism are connected to the testing mechanism.

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

[0008] A better option is that the power control structure includes two tie rods, two connecting rods, two gear adjusting rods, and two power input shafts. The two sides of the steering fork are respectively hinged to one end of the two tie rods, the other end of the two tie 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 adjusting rods, the two gear adjusting rods are rotatably connected to the two power input shafts, and the bevel teeth of the two power input shafts are matched with the two rear wheel power output ends.

[0009] A better option is that the power transmission mechanism includes a counter-rotating drive shaft, two steering front axle boxes, and two impellers. The counter-rotating drive shaft has two cam gears in the middle, which are respectively matched with the bevel teeth of the two power input shafts. The two ends of the counter-rotating drive shaft are connected to the upper ends of the steering front axle boxes through the bevel teeth. The lower ends of the two steering front axle boxes are connected to the two impellers. The tops of the two steering front axle boxes are connected to the test mechanism. The sides of the two steering front axle boxes are respectively hinged to the two steering transmission rods.

[0010] A better option also includes a gearbox that engages with the counter-rotating drive shaft via gears.

[0011] A preferred option is that the testing mechanism includes a display, sensor modules, a signal acquisition system, a motor driver, a main control unit, and a frame. The power transmission mechanism is mounted on the frame. The sensor modules are respectively mounted on the power steering mechanism and the power transmission mechanism. The sensor modules are 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.

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

[0013] A better alternative is that the sensor module includes a steering angle sensor, a torque sensor, and an angle sensor. The steering 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 steering angle sensor, the torque sensor, and the angle sensor are all connected to the signal acquisition system.

[0014] A preferred option is that the frame includes a front frame, side frames, a bottom frame, bushings, and a lifting platform. The front frame is mounted on top of the bottom frame, the display is mounted on the front frame, the side frames are mounted on both sides of the front frame, the power transmission mechanism is mounted on top of the side frames via the bushings, and the lifting platform is mounted on the outside of the side frames.

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

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

[0017] This invention, through its power steering mechanism, steering transmission mechanism, power transmission mechanism, and testing mechanism, can simulate real-world operating environments and accurately test and evaluate system performance, possessing significant research value and practical significance. This testing device not only improves the development efficiency of EPS systems but also provides reliable technical support for future intelligent paddy field operation equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the electric power steering test device for a light-duty power chassis in paddy fields according to the present invention;

[0019] Figure 2This 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 a light-duty power chassis in paddy fields according to the present invention.

[0020] Figure 3 This is a left view of the assembly of the power steering mechanism, steering transmission mechanism and power transmission mechanism of the electric power steering test device for a light-duty power chassis in paddy fields according to the present invention.

[0021] Figure 4 This is an assembly diagram of the steering transmission mechanism and power transmission mechanism of the electric power steering test device for a light-duty power chassis in paddy fields according to the present invention.

[0022] Figure 5 This is a schematic diagram of the steering transmission mechanism of the electric power steering test device for a light-duty power chassis in paddy fields according to the present invention;

[0023] Figure 6 This is a schematic diagram of the test mechanism of the electric power steering test device for a light-duty power chassis in paddy fields according to the present invention;

[0024] Figure 7 yes Figure 6 A magnified view of a portion at point A;

[0025] Figure 8 This is a schematic diagram of the electronic component connections of the electric power steering test device for a light-duty power chassis in paddy fields according to the present invention;

[0026] The components in the attached diagram are labeled as follows: 1-Power steering mechanism; 101-Steering wheel; 102-Steering motor; 103-Steering column; 104-Electric power steering motor; 105-Power steering gear; 2-Steering transmission mechanism; 21-Steering structure; 211-Steering gear shaft; 212-Sector gear; 213-Shaft; 214-Steering fork; 215-Steering transmission rod; 22-Power control structure; 221-Tie rod; 222-Linking rod; 223-Gear adjusting rod; 224-Power transmission... 1. Input shaft; 23. Protective housing; 3. Power transmission mechanism; 301. Gearbox; 302. Reverse rotation drive shaft; 303. Steering front axle box; 304. Impeller; 4. Test mechanism; 41. Display; 42. Sensor module; 421. Angle sensor; 422. Torque sensor; 43. Frame; 431. Front frame; 432. Side frame; 433. Bottom frame; 434. Shaft sleeve; 435. Lifting platform; 435a. Bearing plate; 435b. Lifting rod; 435c. Base. Detailed Implementation

[0027] The invention's objective will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the implementation of the invention is not limited to the following embodiments.

[0028] like Figure 1 As shown, the electric power steering test device for a light-duty power chassis used in paddy fields 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, and the steering transmission mechanism is connected to the power transmission mechanism 3. The power transmission mechanism 3 is mounted on the test mechanism 4. Both the power steering mechanism 1 and the power transmission mechanism 3 are connected to the test mechanism 4.

[0029] The power steering mechanism 1 enables switching between automatic and manual driving. In automatic driving mode, commands can be issued via a host computer to drive the power steering motor, thereby executing the issued steering angle and steering force commands to ensure the accuracy and reliability of the power steering mechanism 1. The steering transmission mechanism 2 provides transmission when the operator turns. The power transmission mechanism 3 controls the transmission of power to achieve steering on the spot. The testing 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 steering motor 104, and a power steering gear 105. The steering wheel 101 and steering motor 102 are both connected to the upper end of the steering column 103. The electric power steering motor 104 and power steering gear 105 are both mounted on the steering column 103, with the electric power steering motor 104 connected to the power steering gear 105. The lower end of the steering column 103 is connected to the steering gear shaft 211 of the steering transmission mechanism 2. Both the electric power steering motor 104 and steering motor 102 are connected to the main control unit of the test mechanism 4 via motor drivers.

[0031] The steering wheel 101 is for manual rotation by the operator. The steering motor 102 is for remote control of the steering, reducing labor intensity. The electric power steering motor 104 provides assistance to the rotation of the steering column 103, reducing the operator's labor intensity. The power steering gear 105 reduces the speed of the electric power steering motor 104.

[0032] like Figures 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 housing 23. The power control structure 22 includes two tie rods 221, two connecting rods 222, two gear adjusting 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. The lower end of the steering gear shaft 211 is provided with a gear, which meshes with the sector gear 212. The rotating shaft 213 is rotatably mounted on the protective housing 23. The sector gear 212 is fixedly sleeved in the middle 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 sides of the steering fork 214 are respectively hinged to one end of two tie rods 221, and the other ends of the two tie 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 adjusting rods 223. The two gear adjusting rods 223 can rotate by themselves, thereby pushing the two rear wheel power output shafts 224 to move back and forth. The front ends of the two rear wheel power output shafts 224 are provided with bevel teeth, which are matched with two cam gears on the reverse rotating transmission shaft 302 of the power transmission mechanism 3.

[0033] Steering structure 21 transmits the kinetic energy of steering column 103 to steering front axle box 303 of power transmission mechanism 3, thereby controlling the steering of impeller 304. Power control structure 22 controls the two power inputs of the counter-rotating transmission shaft 302 on power transmission mechanism 3, achieving in-situ steering. Steering gear 211 transmits the kinetic energy of steering column 103 to sector gear 212. Sector gear 212 transmits the kinetic energy of steering gear 211 to shaft 213. Shaft 213 transmits the kinetic energy of sector gear 212 to steering fork 214. Steering fork 214 pulls two steering transmission rods 215 and two tie rods 221. Steering transmission rods 215 pull steering front axle box 303 to rotate, thereby adjusting the steering angle of impeller 304. Protective shell 23 protects internal parts. Tie rod 221 acts as a transmission rod, used to pull connecting rod 222. Linkage 222 is used to rotate gear adjusting rod 223. Gear adjusting rod 223, by rotating itself, pushes or releases the rear wheel power output shaft 224, thereby enabling contact and separation between the rear wheel power output shaft 224 and the counter-rotating drive shaft 302. The rear wheel power output shaft 224 is used to output power from the counter-rotating drive shaft 302 to the rear wheel (not shown in the figure) as power.

[0034] likeFigure 4 As shown, the power transmission mechanism 3 includes a gearbox 301, a counter-rotating drive shaft 302, two front steering axle boxes 303, and two impellers 304. The counter-rotating drive shaft 302 has two cam gears in its middle, which are respectively matched with the bevel teeth of the two rear wheel power output shafts 224. A large gear is located between the two cam gears and is connected to the gearbox 301, which outputs power outwards. Both ends of the counter-rotating drive shaft 302 are connected to the upper ends of the front steering axle boxes 303 via bevel teeth. The lower ends of the two front steering axle boxes 303 are connected to the two impellers 304. The tops of the two front steering axle boxes 303 are connected to the angle sensor 421 of the test mechanism 4. The sides of the two front steering axle boxes 303 are respectively hinged to two steering transmission rods 215.

[0035] The gearbox 301 is used to transmit the kinetic energy of the reverse-rotating drive shaft 302 to external equipment after speed conversion. The reverse-rotating drive shaft 302 can be purchased on the existing market. When moving in a straight line, the two rear wheel power output shafts 224 cause both rear wheels to rotate simultaneously, increasing the forward power of the equipment. When the steering wheel 101 turns left, the reverse-rotating drive shaft 302 engages with the right rear wheel power output shaft 224, providing power to the right rear wheel, allowing the equipment to turn left more quickly. When the steering wheel 101 turns right, the reverse-rotating drive shaft 302 engages with the left rear wheel power output shaft 224, providing power to the left rear wheel, allowing the equipment to turn right more quickly. The steering front axle box 303 is used to change the direction of power transmission, transmitting power to the impeller 304, and can rotate under the pull of the steering transmission rod 215, thereby driving the impeller 304 to steer. The impeller 304 is used to increase the resistance with respect to the ground.

[0036] like Figures 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 steering angle sensor, a torque sensor 422, and an angle sensor 421. The steering angle sensor is mounted on the steering motor 102, the torque sensor 422 is mounted on the steering column 103, and the angle sensor 421 is mounted on the top of the steering front axle box 303 of the power transmission mechanism 3. The steering angle sensor, torque sensor 422, and 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 via the communication module. The main control unit is connected to the display 41.

[0037] Display 41 is used to display the test results of the real-time monitoring assistance device. Sensor module 42 is used to collect steering wheel 101 angle data, steering column 103 torque, and steering front axle box 303 rotation angle. Signal acquisition system is used to collect sensor data. Frame 43 is used to fix various mechanisms. Digital communication module is used to convert sensor signals into digital data. Communication module is used to transmit information from real-time processing unit to main control unit. Real-time processing unit is used to process digital data. Steering angle sensor is used to collect steering wheel 101 angle data. Torque sensor 422 is used to collect steering column 103 torque magnitude. Angle sensor 421 is used to collect steering front axle box 303 rotation angle.

[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 bushings 434, and two lifting platforms 435; each lifting platform 435 includes four lifting rods 435b, a support plate 435a, and a base 435c. The front frame 431 is mounted on the top front of the bottom frame 433, and the display 41 is mounted on the top of the front frame 431. The two side frames 432 are respectively mounted on the left and right sides of the bottom frame 433, and the two ends of the reverse rotation drive shaft 302 of the power transmission mechanism 3 are mounted on the top of the side frames 432 through bushings 434. The two bases 435c are respectively mounted on the top left and right sides of the bottom frame 433, located outside the two side frames 432. Eight lifting rods 435b are respectively mounted on the top of the two bases 435c, and the top of every four lifting rods 435b is connected to a support plate 435a.

[0039] The front frame 431 is used to mount and fix the display 41. The side frame 432 is used to support the power transmission mechanism 3. The bottom frame 433 is used for load-bearing and increasing the force-bearing area. The bushing 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 between the impeller 304 and the simulation device, realize the resistance of paddy fields 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 a light-duty power chassis used in paddy fields in this embodiment has the following advantages:

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

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

[0043] 3. Currently, there is no test device for the steering system of the lightweight power chassis in paddy fields. Designing such a test device will help carry out future research on power chassis and will also allow for joint research with other aspects such as suspension.

[0044] 4. This testing device can simulate steering resistance torque under different working conditions such as road surface, paddy field and dry land, and can be used to conduct testing experiments in a more convenient way, reducing costs.

[0045] 5. This test device adds the ability to switch between manual steering and electric steering. The electric steering can accurately complete the steering action by issuing the corresponding steering angle command, which is convenient for further investigation of the performance of the designed electric power steering system.

[0046] The above-described specific embodiments are preferred embodiments of the present invention and are not intended to limit the present invention. Any other changes or equivalent substitutions made without departing from the technical solution of the present invention are included within the protection scope of the present invention.

Claims

1. A test device for electric power assisted steering of a light power chassis for paddy field, characterized in that: The power steering mechanism, the steering transmission mechanism, the power transmission mechanism and the test mechanism, the steering transmission mechanism comprises steering structure and power control structure, the steering structure comprises steering pinion, sector gear, rotating shaft, steering yoke and two steering transmission rods, the power steering mechanism is connected with the steering pinion, the steering pinion is engaged with the sector gear, the sector gear is connected with the steering yoke through the rotating shaft, the two sides of the steering yoke are respectively hinged with the one end of two steering transmission rods, the other end of two steering transmission rods is respectively connected with the two front wheel power output ends of the power transmission mechanism, the steering yoke is respectively connected with the two rear wheel power output ends of the power transmission mechanism through the power control structure, the power transmission mechanism and the power steering mechanism are connected with the test mechanism; The power steering mechanism comprises steering wheel, steering motor, steering column, electric power steering motor and power steering gear, the steering wheel and steering motor are connected with the one end of the steering column, the electric power steering motor and the power steering gear are installed on the steering column, the electric power steering motor is connected with the power steering gear, the other end of the steering column is connected with the steering structure, the steering motor and the electric power steering motor are connected with the test mechanism; The power control structure comprises two pull rods, two connecting rods, two gear adjusting rods and two power input shafts, the two sides of the steering yoke are respectively hinged with the one end of two pull rods, the other end of two pull rods is hinged with the one end of two connecting rods, the other end of two connecting rods is fixedly connected with two gear adjusting rods, two gear adjusting rods are rotationally connected with two power input shafts, the bevel gears of two power input shafts are matched with two rear wheel power output ends; The power transmission mechanism comprises reverse rotation transmission shaft, two steering front axle boxes and two vane wheels, the middle part of the reverse rotation transmission shaft is provided with two convex gears, two convex gears are respectively matched with the bevel gears of two power input shafts, the two ends of the reverse rotation transmission shaft are connected with the upper ends of the steering front axle boxes through bevel gears, the lower ends of two steering front axle boxes are connected with two vane wheels, the top of two steering front axle boxes is connected with the test mechanism, the side of two steering front axle boxes is respectively hinged with two steering transmission rods.

2. The electric power assisted steering test device for a light power chassis of a paddy field according to claim 1, characterized in that: It also comprises a gearbox, which is engaged with the reverse rotation transmission shaft through a gear.

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

4. The electric power assisted steering test device for light power chassis of paddy field according to claim 3, 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 with the real-time processing unit through the digital communication module, and the real-time processing unit is connected with the communication module.

5. The electric power assisted steering test device for light power chassis of paddy field according to claim 3, characterized in that: The sensor module comprises 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 connected with the signal acquisition system.

6. The electric power assisted steering test device for light power chassis of paddy field according to claim 3, characterized in that: The rack comprises a front frame, side frames, 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 frames through the shaft sleeve, and the lifting platform is installed outside the side frames.

7. The electric power assisted steering test device for light power chassis of paddy field according to claim 6, 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 with the bottom of the bearing plate.

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