Rear wheel steering reset precision testing device and testing method

Abstract

The invention relates to the technical field of automobile testing, and discloses a rear wheel steering reset precision testing device and method, the rear wheel steering reset precision testing device comprises a rack, the rack is provided with four groups of limiting assemblies corresponding to wheels, and the outer sides of the limiting assemblies are rotatably provided with plate rolling assemblies. According to the rear wheel steering reset precision testing device and method, the rising limiting frame is used for roughly limiting the wheels, the selected position of the limiting frame is large, an experiment can be carried out as long as an operator drives the vehicle to the rough position, the rising limiting frame is used for clamping the tires through the clamping plates installed in the rising limiting frame, and therefore the accuracy of the rear wheel steering reset precision is improved. The testing mode is convenient for operators and does not cause the problem of tire sinking, the purpose that the limiting frame and the tire are kept to rotate together by fixing the tire is achieved, the steering precision of the four-wheel automobile can be detected by matching with the installed angle detector, the process of testing the steering precision of the four-wheel automobile is more convenient, and the use feeling is better.

Description

Technical Field

[0001] The invention relates to the technical field of automobile testing, in particular to a rear wheel steering reset accuracy testing device and a testing method. Background Art

[0002] The rear-wheel steering reset accuracy test is one of the important indicators for evaluating the performance of the automobile steering system. It ensures that the vehicle can automatically return to the straight-ahead state after turning, thereby improving driving safety and stability. The purpose of the rear-wheel steering reset accuracy test is to evaluate the self-centering ability of the automobile steering gear assembly, ensuring that the vehicle can automatically return to the centering state after completing the steering operation, reducing the driver's operating burden and reducing the risk of accidents. The specific test content includes detecting whether the self-centering performance of the steering gear assembly meets the requirements of regulations and standards, identifying possible performance problems, and repairing and improving them in a timely manner.

[0003] The performance of the rear-wheel steering system not only depends on its response speed and accuracy during the steering process, but is also closely related to the reset accuracy after steering. If the rear wheels cannot accurately return to the initial position after steering, it will have a negative impact on the vehicle's straight-line driving stability, leading to vehicle deviation, uneven tire wear and other problems. In severe cases, it may even affect driving safety. At present, considering that it is difficult to measure the rear-wheel steering displacement and reset accuracy in the actual vehicle environment, the vehicle needs to be disassembled and the measurement accuracy cannot be guaranteed. It is very important to conduct bench tests on the rear-wheel steering displacement and reset accuracy. Having a complete bench test environment and mature test methods can provide strong support for the test data.

[0004] The prior art publication number is CN113092140B, which provides an online turning angle test device for a two-wheeled motorcycle, comprising: a front wheel steering frame, which is supported and arranged on a horizontal plane; a turntable, which is rotatably supported and arranged on the front wheel steering frame; a front wheel placement groove; at least two front wheel clamping cylinders, which are respectively arranged on the turntable in opposite directions; a reset mechanism, one end of which is fixedly connected to the bottom of the turntable, and the other end of which is fixedly connected to the bottom of the front wheel steering frame; a wheel clamping platform frame; two rear wheel clamping plate components, which are relatively parallel and arranged on the top of the wheel clamping platform frame; at least two pairs of rear wheel clamping cylinders, the output ends of the rear wheel clamping cylinders are connected to the rear wheel clamping plate components; a synchronous clamping connecting rod mechanism, which is arranged between the two rear wheel clamping cylinders; two buffer mechanisms, which are respectively arranged at the bottom of the two rear wheel clamping plate components, and the accuracy of angle measurement is guaranteed and the test accuracy is improved through the cooperation of the steering test platform and the wheel clamping platform.

[0005] Although the above-mentioned prior art can detect the turning angle of a two-wheeled motorcycle, it is unable to detect a four-wheeled vehicle. Compared with a two-wheeled motorcycle, a four-wheeled vehicle is larger in size and heavier in weight, and has greater limitations in detection on a test bench. For example, the above-mentioned two-wheeled vehicle utilizes rectangular grooves to allow the tires to sink into the corresponding grooves and cooperates with the cylinder clamp to clamp the tires. However, if the four wheels need to sink into the corresponding grooves, it requires an experienced operator to steadily stop the four tires in the four rectangular grooves in terms of operational difficulty. If all four tires are sunk, it may result in the inability to successfully drive out later. Therefore, the above-mentioned limiting method is not suitable for four-wheeled vehicle detection.

[0006] It can be seen that a rear wheel steering reset accuracy test device and a test method are needed to solve the problem that the existing equipment mentioned in the above background technology is not suitable for tire steering reset accuracy detection of four-wheel vehicles. Summary of the invention

[0007] The purpose of the present invention is to provide a rear wheel steering reset accuracy testing device and a testing method to solve the problem in the above background technology that the existing equipment is not suitable for tire steering reset accuracy testing of four-wheel vehicles.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a rear wheel steering reset accuracy test device, comprising a test bench, on which four groups of limit assemblies corresponding to the wheels are arranged, and a rolling plate assembly is rotatably arranged on the outer side of the limit assemblies, a lifting assembly for driving the limit assemblies to rise and fall is installed at the bottom end of the limit assemblies, and a positioning assembly is linked to one side of the lifting assembly, and the positioning assembly is used to position the limit assemblies; The limiting assembly includes a limiting frame, and a clamping plate is symmetrically arranged on the inner side of the limiting frame; The lifting assembly includes a first pulley group, a second pulley group and a third pulley group, and one side of the second pulley group is connected to a ratchet through a shaft, a non-return mechanism is provided on the outer side of the ratchet, and one side of the ratchet is connected to a transmission gear, a large gear is meshed below the transmission gear, and a lifting gear is provided on one side of the large gear, and one side of the lifting gear is meshed with a tooth column, and the tooth column is located at the bottom of the limit frame, and the tooth column passes through the rotating table and rises and falls inside it; The positioning assembly includes a universal shaft, and one side of the end of the universal shaft is connected to a rear pulley group through a second bevel gear group, and the rear side of the rear pulley group is connected to a rotating handle and a lower slider, the lower slider penetrates the rotating rod, and the upper part of the rotating rod is connected to a positioning handle of a limited position limit frame through a second slider, and the shape of the positioning handle matches the limit frame, the rear side of the rotating rod is connected to a back plate and a front plate, and limited position grooves are provided in the back plate and the front plate.

[0009] Preferably, a bottom bin is provided at the bottom end of the stand, the lifting assembly and the positioning assembly are both installed inside the bottom bin, and a rotating table is also provided inside the bottom bin, the bottom end of the rotating table is connected to a column, the bottom end of the column is provided with a rotating base, and the rotating table rotates inside the bottom bin through the rotating base.

[0010] Preferably, a cavity is provided in the middle position of the limit frame, a filling block is provided inside the cavity, and an angle sensor is installed on the outside of the limit frame, a fixed sleeve is fixedly connected to the outside of the limit frame, and a through shaft is rotatably penetrated inside the fixed sleeve, a flat gear set is connected to the outside of the through shaft, and a connecting sleeve is sleeved on the end of the through shaft, a short shaft is sleeved on the inside of the connecting sleeve and located on the other side of the connecting sleeve, and a short shaft sleeve is connected to the end of the short shaft, and a folding plate is connected to the outside of the connecting sleeve.

[0011] Preferably, the number of the folding plates is four groups, and the four groups of folding plates are all arc plate structures, and the four groups of folding plates can be flipped and folded on the outside of the limiting frame.

[0012] Preferably, the lifting assembly includes a motor, and the output end of the motor is connected to a first pulley group, the first pulley group is vertically connected to a second pulley group via a belt, and the first pulley group is horizontally connected to a transmission pulley via a belt, one side of the transmission pulley is connected to a mounting wheel, and the mounting wheel is located at the end of the universal shaft.

[0013] Preferably, the second pulley group and the third pulley group are connected by a belt, and a non-return mechanism is provided on the outer side of the ratchet, including a fixed short column, a pressing plate, a non-return plate and a spring pressure plate, and the pressing plate and the non-return plate are both connected to the two ends of the outer side of the fixed short column through a connecting sleeve, wherein a spring pressure plate is provided above the non-return plate, and the non-return plate is pressed into the gap between the ratchet teeth by the spring pressure plate.

[0014] Preferably, one side of the third pulley group is connected to the first bevel gear group, and the first bevel gear group passes through the mounting frame and is connected to a rotating column, a spiral strip is provided on the outside of the rotating column, and a lifting column is provided on one side of the rotating column located inside the mounting frame, and a protrusion is connected to the outside of the lifting column, the protrusion is located on one side of the spiral strip, a through column is connected below the lifting column, and the through column passes through the mounting frame and extends to its outside, and a spring is sleeved on the part of the through column located on the inner side of the mounting frame.

[0015] Preferably, the universal shaft includes two disconnected shafts, the ends of the two disconnected shafts are connected with hinged joints, the two disconnected shafts are connected by a hinged joint, the lower slider is located on the rear side of the rotating handle, and grooves are provided on the upper and lower sides inside the rotating rod, the lower groove is penetrated by the lower slider, and the upper groove is penetrated by the second slider, a fixed block is provided at the bottom end of the rotating rod, and the rotating rod rotates on one side of the fixed block.

[0016] Preferably, the second slider includes a slider portion, a vertical shaft portion and a positioning column, and the slider portion is located on the front side of the vertical shaft portion, the positioning column is located on the rear side of the vertical shaft portion, and the positioning handle is located at the top end of the vertical shaft portion, a V-groove is provided in the back plate, and a straight groove is provided in the front plate, the slider portion passes through the straight groove and extends to its outside, and the positioning column passes through the V-groove and moves inside it, and the vertical shaft portion is located between the front plate and the back plate.

[0017] The testing method of the rear wheel steering reset accuracy testing device comprises the following steps: Step 1: Drive the vehicle to be tested onto the test bench. The positions of the four groups of limit assemblies correspond to the positions of the four groups of tires. Start the motor. Use the rising limit frame and the clamping plate that clamps the tire inward to keep the limit frame and the tire angle consistent. The process is that after the motor is started, it will drive the first pulley group, the second pulley group and the third pulley group to rotate. The rotation of the second pulley group will drive the ratchet and the transmission gear to rotate. When the transmission gear rotates, it will drive the large gear to rotate through meshing. The rotation of the large gear will drive the lifting gear to rotate, thereby driving the tooth column to rise. The four groups of tooth columns rise synchronously, and then drive the limit frame and the clamping plate to rise. The started clamping plate clamps the tire. When the ratchet rotates, the check plate is pressed by the spring pressure sheet to be consistently stuck in the teeth of the ratchet, so the ratchet can be prevented from reversing. Step 2: At this time, the transmission of the first pulley group and the transmission pulley group causes the positioning handle to rotate, so that it is separated from the limit frame and no longer restricts the limit frame. Therefore, the limit frame follows the rotation of the tire. In order not to interfere with the rotation of the limit frame, the motor installed on one side of the flat gear group can be started to make the flat gear group drive the through shaft to rotate, thereby driving the connecting sleeve to rotate, so that the connecting sleeve drives the short shaft sleeve to flip through the short shaft, and the short shaft sleeve drives the folding plate to flip upward. In this way, there is a space for rotation between the limit frame and the fixed part of the test stand. When the vehicle to be tested is turned off, the wheels do not return to the center, and the accuracy of the active return of the wheels is observed through the angle detector installed on the limit frame. Step 3: After the inspection is completed, start the motor on the rear side of the flat gear set first, so that the four sets of folding plates flip down to facilitate the car to drive out. After the staff manipulates the tire to return to the normal position and drive out, control the motor to rotate in the opposite direction. After starting, the first pulley set, the second pulley set, and the third pulley set rotate synchronously. The third pulley set drives the mounting frame to rotate through the first bevel gear set, so that the spiral strip on the rotating column rotates, and at the same time drives the convex block to descend, so that the convex block drives the through column to descend, and the pressing plate is supported, so that the check plate is tilted, counteracting the force of the spring in the spring pressure plate, so that the second pulley set will not be blocked by the check plate when driving the ratchet to reverse, and the ratchet drives the transmission gear to rotate normally, so that the tooth column descends; Step 4: The rotating first pulley group will drive the transmission pulley on one side to rotate through the belt, so the rotation will be transmitted to the second bevel gear group and the rear pulley group through the mounting wheel, the hinge head and the universal shaft, so that the rotating handle drives the rotating rod to rotate through the lower slider. When the rotating rod rotates, the second slider inside it is limited by the straight groove, and the positioning column is limited by the V-groove, so that the positioning handle moves and rotates at the same time, so that the positioning handle rotates to one side of the limit frame, clamps it and fixes it, so as to prevent the limit frame from rotating at will when no detection is needed at the top.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are: First, the present invention realizes the approximate limiting of the wheel by using the rising limit frame through the setting of the stand, bottom bin, limit assembly and lifting assembly. The position selected by the limit frame is relatively large, and the experiment can be carried out as long as the operator drives the car to the approximate position. The rising limit frame clamps the tire by the clamping plate installed therein. The testing method is convenient for the operator and will not cause the problem of tire sinking. The purpose of fixing the tire is to make the limit frame and the tire rotate together. The steering accuracy of the four-wheel vehicle can be tested in conjunction with the installed angle detector, making the process of testing the steering accuracy of the four-wheel vehicle more convenient and better in use.

[0019] Secondly, the present invention realizes that when the car enters the test bench through the plate rolling assembly, the four groups are lowered and connected to the fixed part of the test bench to avoid a large gap between the limit frame and the fixed part that affects the car's entry. When the car is ready for inspection, it is folded and turned up without affecting the rotation of the rectangular limit frame. The fixed area and the inspection area on the test bench can also be distinguished, thereby serving the purpose of reminding the operator.

[0020] Thirdly, the present invention realizes that when the lifting assembly is lifted or lowered, the positioning assembly linked with the lifting assembly drives the positioning handle to move and rotate. When the positioning handle rotates to the outside of the limit frame, the rectangular shape is clamped to keep it fixed, and the limit frame will not rotate when detection is not needed, thereby reducing the occurrence of accidents. When the limit frame rises, the positioning handle will also rotate away from the limit frame and will not restrict the rotation of the limit frame. The linkage between the lifting assembly and the positioning assembly makes the device more integrated and more linked. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional view of the present invention; Figure 3 It is a schematic diagram of the connection structure of the limit assembly and the plate rolling assembly of the present invention; Figure 4It is a schematic diagram of the disassembled structure of the limit assembly and the plate rolling assembly of the present invention; Figure 5 For the present invention Figure 3 A magnified view of the structure at A; Figure 6 It is a schematic diagram of the connection structure of the limit assembly, the plate rolling assembly, the lifting assembly and the positioning assembly of the present invention; Figure 7 This is a schematic diagram of the connection structure of the lifting assembly of the present invention; Figure 8 This is a structural breakdown diagram of the lifting assembly of the present invention; Fig. 9 This is a schematic diagram of the connection structure of the lifting assembly and the positioning assembly of the present invention; Fig.10 This is a disassembled diagram of the lifting component structure of the present invention.

[0022] Among them: 1. Stand; 2. Bottom bin; 3. Limiting assembly; 301. Limiting frame; 302. Clamping plate; 4. Plate rolling assembly; 401. Fixed sleeve; 402. Through shaft; 403. Flat gear set; 404. Connecting sleeve; 405. Short shaft; 406. Short shaft sleeve; 407. Folding plate; 5. Lifting assembly; 501. Motor; 502. First pulley set; 503. Second pulley set; 504. Third pulley set; 505. Ratchet; 5051. Fixed short column; 5052. Pressing plate; 5053. Check plate; 5054. Spring pressure plate; 506. Transmission gear; 507. Large gear; 508. Lifting gear; 509. Gear Column; 510, first bevel gear set; 511, mounting frame; 512, rotating column; 513, spiral strip; 514, lifting column; 515, convex block; 516, through column; 6, rotating table; 601, column; 602, rotating base; 7, positioning assembly; 701, universal shaft; 702, mounting wheel; 703, hinged head; 704, second bevel gear set; 705, rear pulley set; 706, rotating handle; 7061, lower slider; 707, rotating rod; 7071, fixed block; 708, second slider; 7081, positioning column; 709, positioning handle; 710, back plate; 711, V-groove; 712, front plate; 713, straight groove. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 8, a rear wheel steering reset accuracy testing device and a testing method, comprising a test bench 1, on which four groups of limit assemblies 3 corresponding to the wheels are arranged, a lifting assembly 5 for driving the limit assemblies 3 to rise and fall is installed at the bottom of the limit assemblies 3, the limit assemblies 3 include a limit frame 301, and a clamping plate 302 is symmetrically arranged on the inner side of the limit frame 301, the lifting assembly 5 includes a first pulley group 502, a second pulley group 503 and a third pulley group 504, and one side of the second pulley group 503 is connected with a ratchet 505 through an axis, a non-return mechanism is arranged on the outer side of the ratchet 505, and one side of the ratchet 505 is connected with a transmission gear 506, a large gear 507 is meshed below the transmission gear 506, and a lifting gear 508 is arranged on one side of the large gear 507, and one side of the lifting gear 508 is meshed with a tooth column 509, and the tooth column 509 is located at the bottom of the limit frame 301, and the tooth column 509 passes through the rotating table 6 and rises and falls inside it.

[0025] In this embodiment, four groups of limit frames 301 are arranged on the top of the platform 1. When not raised, the limit frames 301 including the limit frames 301 inside thereof are kept in a level state with other fixed parts on the platform 1, so that the car can remain as stable as possible when it drives onto the platform 1. When the car drives in, the folding plates 407 around the limit frames 301 are in an unfolded state and can be covered on the fixed parts, so that the load-bearing capacity of the folding plates 407 is guaranteed. The folding plates 407 covering the fixed parts are not much higher than the fixed parts, so there will not be much ups and downs when the car drives in. Corresponding lifting components 5, rotating tables 6, and positioning components 7 can be set under the four groups of limit frames 301 to measure the steering accuracy of each tire.

[0026] Specifically, a bottom bin 2 is provided at the bottom end of the stand 1, the lifting assembly 5 and the positioning assembly 7 are both installed inside the bottom bin 2, and a rotating table 6 is also provided inside the bottom bin 2, the bottom end of the rotating table 6 is connected to a column 601, and a rotating base 602 is provided at the bottom end of the column 601, and the rotating table 6 rotates inside the bottom bin 2 through the rotating base 602.

[0027] In this embodiment, when the limit frame 301 rotates with the tire, the rotating table 6 is also rotated by the tooth column 509, and the rotating base 602 below is also rotated. The rotating base 602 is installed at the bottom end of the bottom bin 2, and plays a certain supporting role for the equipment installed above. The lifting component 5 and part of the positioning component 7 are installed on the rotating table 6, and the rotating table 6 also provides support for its installation. The tooth column 509 penetrates the rotating table 6 and extends to the bottom thereof. A protrusion is provided at the end position so that it will not completely penetrate the rotating table 6. The tooth column 509 penetrates the rotating table 6 when it is lifted or lowered inside the rotating table 6.

[0028] Specifically, the lifting assembly 5 includes a motor 501, and the output end of the motor 501 is connected to a first pulley group 502, the first pulley group 502 is vertically connected to a second pulley group 503 via a belt, and the first pulley group 502 is horizontally connected to a transmission pulley via a belt, one side of the transmission pulley is connected to a mounting wheel 702, and the mounting wheel 702 is located at the end of the universal shaft 701.

[0029] In this embodiment, the number of gear columns 509 can be four groups, and the two groups of gear columns 509 can be driven to rise and fall synchronously through two coaxial groups of lifting gears 508. The two coaxial groups of gear columns 509 can each drive a group of meshing gear columns 509. The gear columns 509 in the other direction can continue to drive the gear to rotate by installing a pulley on one side of the lifting gear 508, thereby driving the two groups of gear columns 509 in the other direction to rise and fall synchronously, so that the four groups of gear columns 509 can rise and fall synchronously.

[0030] Specifically, the second pulley group 503 and the third pulley group 504 are connected by a belt, and a non-return mechanism is provided on the outer side of the ratchet 505, including a fixed short column 5051, a pressing plate 5052, a non-return plate 5053 and a spring pressure plate 5054, and the pressing plate 5052 and the non-return plate 5053 are both connected to the two ends of the outer side of the fixed short column 5051 through a connecting sleeve, wherein a spring pressure plate 5054 is provided above the non-return plate 5053, and the non-return plate 5053 is pressed into the gap between the teeth of the ratchet 505 by the spring pressure plate 5054.

[0031] In this embodiment, the fixed short column 5051, the pressing plate 5052, the non-return plate 5053 and the spring pressure plate 5054 form a non-return mechanism, which is equivalent to a pawl, which stops the ratchet 505 so that it can only operate normally in one direction. If it needs to rotate in the opposite direction, it is necessary to press the pressing plate 5052. When the pressing plate 5052 moves downward, the non-return plate 5053 will move upward. The non-return plate 5053 has enough force to lift the spring pressure plate 5054, so that the non-return plate 5053 will be disconnected from the ratchet 505, and there is no problem with the reversal of the ratchet 505. The intermediate shafts of the fixed short column 5051 and the spring pressure plate 5054 are fixedly installed inside the bottom bin 2, and a mounting plate can be extended from the bottom bin 2 to fix it.

[0032] Specifically, one side of the third pulley group 504 is connected to the first bevel gear group 510, and the first bevel gear group 510 passes through the mounting frame 511 and is connected to the rotating column 512, a spiral bar 513 is arranged on the outer side of the rotating column 512, and one side of the rotating column 512 is located inside the mounting frame 511 and a lifting column 514 is arranged, and a protrusion 515 is connected to the outer side of the lifting column 514, and the protrusion 515 is located on one side of the spiral bar 513, a through column 516 is connected below the lifting column 514, and the through column 516 passes through the mounting frame 511 and extends to its outer side, and the through column 516 is located on the inner side of the mounting frame 511 and is sleeved with a spring.

[0033] In this embodiment, the first bevel gear set 510, the mounting frame 511, the rotating column 512, the spiral strip 513, the lifting column 514, the protrusion 515 and the through column 516 are arranged to press the pressing plate 5052 downward. When the third pulley set 504 drives the first bevel gear set 510 to rotate, it will also drive the rotating column 512 to rotate inside the mounting frame 511. The spiral spiral strip 513 will carry the protrusion 515 to rise and fall, thereby driving the through column 516 to rise and fall, and then penetrate the mounting frame 511 to press the pressing plate 5052. The mounting frame 511 is also fixedly installed inside the bottom bin 2.

[0034] See also Figure 3-Figure 5 , a rear wheel steering reset accuracy testing device and testing method, a rolling plate component 4 is rotated on the outer side of the limit component 3.

[0035] In this embodiment, the limit frame 301 is a rectangular structure, and four groups of arc-shaped folding plates 407 are added to its outside so that the limit frame 301 can not only make up the gap between it and the fixed part of the stand 1, but also ensure that the limit frame 301 will not be affected when rotating. The folding plates 407 need to be made of metal material with strong pressure resistance. The rotation direction of the folding plates 407 can be flipped from top to bottom or from bottom to top. When flipping from top to bottom, it can cover the part of the fixed part of the stand 1, and the force can be borne by the fixed part. However, the folding plates 407 cannot be too large and need to be determined according to the height of the car chassis. When flipping from bottom to top, the force is on the motor driving the flat gear set 403, but the height of the car chassis can be ignored. Both flipping methods are possible and are determined according to actual needs.

[0036] Specifically, a cavity is provided in the middle position of the limit frame 301, a filling block is provided inside the cavity, and an angle sensor is installed on the outside of the limit frame 301, a fixed sleeve 401 is fixedly connected to the outside of the limit frame 301, and a through shaft 402 is rotated inside the fixed sleeve 401, a flat gear set 403 is connected to the outside of the through shaft 402, and a connecting sleeve 404 is sleeved on the end of the through shaft 402, a short shaft 405 is sleeved on the other side of the connecting sleeve 404, and a short shaft sleeve 406 is connected to the end of the short shaft 405, and a folding plate 407 is connected to the outside of the connecting sleeve 404.

[0037] In this embodiment, the filling block will not rise or fall with the limit frame 301. The filling block is the position of the tire landing point and provides support for the tire. It can be installed on the inner wall of the bottom bin 2, or it can be installed on the top of the rotating base 602 to penetrate the rotating table 6 and extend upward. The flat gear set 403 includes two sets of meshing gears and an axis and a motor installed behind the axis. The motor drives the shaft to rotate, and the axis drives a set of gears to rotate. The gears drive the gears arranged on the outside of the through-shaft 402 to rotate, thereby driving the through-shaft 402 to rotate. The through-shaft 402 rotates inside the fixed sleeve 401. Since the installation position of the through-shaft 402 is not the center point of the connecting sleeve 404, it will drive the connecting sleeve 404 to rotate around the through-shaft 402 as the center. The short shaft 405 is connected and moved in the through-hole sleeve in the connecting sleeve 404. The short shaft 405 and the short shaft sleeve 406 can be connected to the connecting sleeves 404 in other directions to rotate together, thereby driving the folding plates 407 in the other three directions to rotate, so as to achieve the purpose of synchronous rotation.

[0038] Specifically, there are four groups of folding plates 407 , and the four groups of folding plates 407 are all arc plate structures. The four groups of folding plates 407 can be flipped and folded outside the limiting frame 301 .

[0039] In this embodiment, the angle sensor installed outside the limit frame 301 is electrically connected to the computer, and the current rotation angle can be displayed through the matching software in the computer to intuitively show the accuracy of tire rotation.

[0040] See also Figure 9-10, a rear wheel steering reset accuracy testing device and a testing method, a positioning assembly 7 is linked to one side of the lifting assembly 5, and the positioning assembly 7 is used to position the limit assembly 3. The positioning assembly 7 includes a universal shaft 701, and one side of the end of the universal shaft 701 is connected to a rear pulley group 705 through a second bevel gear group 704, and the rear side of the rear pulley group 705 is connected to a rotating handle 706 and a lower slider 7061, and the lower slider 7061 passes through a rotating rod 707, and the upper part of the rotating rod 707 is connected to a positioning handle 709 of a limited limit frame 301 through a second slider 708, and the shape of the positioning handle 709 matches the limit frame 301, and the rear side of the rotating rod 707 is connected to a back plate 710 and a front plate 712, and limited grooves are provided in the back plate 710 and the front plate 712.

[0041] In this embodiment, the pulley that drives the mounting wheel 702 to rotate extends from the first pulley group 502. The first pulley group 502 is a multi-groove pulley. One group of belts is connected to the second pulley group 503 in the vertical direction, and another group of belts is connected to the transmission pulley in the horizontal direction, thereby providing power for the rotation of the mounting wheel 702, and also enabling the lifting component 5 and the positioning component 7 to be linked. There are two groups of mounting wheels 702, which are located at both ends of the universal shaft 701. There are four groups of universal shafts 701, which are equidistantly distributed on the circumferential ring on one side of the mounting wheel 702.

[0042] Specifically, the universal joint 701 includes two disconnected shafts, the ends of the two disconnected shafts are connected with hinge joints 703, the two disconnected shafts are connected by the hinge joints 703, the lower slider 7061 is located on the rear side of the rotating handle 706, and grooves are provided on the upper and lower sides of the rotating rod 707. The lower groove is penetrated by the lower slider 7061, and the upper groove is penetrated by the second slider 708. A fixed block 7071 is provided at the bottom end of the rotating rod 707, and the rotating rod 707 rotates on one side of the fixed block 7071.

[0043] In this embodiment, as the rotating table 6 rotates, the universal joint 701 installed on the rotating table 6 is designed with a middle disconnect hinge so that the rotation transmission is not affected by the rotating table 6. As long as the motor 501 is started, the second bevel gear set 704 will be driven to rotate, thereby driving the overall positioning assembly 7 to operate.

[0044] Specifically, the second slider 708 includes a slider portion, a vertical shaft portion and a positioning column 7081, and the slider portion is located on the front side of the vertical shaft portion, the positioning column 7081 is located on the rear side of the vertical shaft portion, and the positioning handle 709 is located at the top of the vertical shaft portion, a V-groove 711 is opened in the back plate 710, and a straight groove 713 is opened in the front plate 712, the slider portion passes through the straight groove 713 and extends to the outside thereof, and the positioning column 7081 passes through the V-groove 711 and moves inside it, and the vertical shaft portion is located between the front plate 712 and the back plate 710.

[0045] In this embodiment, when the rotating rod 707 swings, it will drive the second slider 708 to move. The second slider 708 is affected by the trajectory of the straight groove 713, and the positioning column 7081 on the rear side of the second slider 708 is affected by the trajectory of the V-groove 711, so it will drive the vertical part of the positioning handle 709 to move back and forth, and it will also flip back and forth while moving. After the clamping part at the end of the positioning handle 709 flips over and reaches one side of the limit frame 301, it will clamp the side of the rectangular limit frame 301, thereby controlling the limit frame 301 to avoid the limit frame 301 from rotating when rotation detection is not required. When the positioning handle 709 is away from the limit frame 301, the clamping part in the positioning handle 709 will not control the limit frame 301, thereby not affecting the rotation of the limit frame 301. This happens when the limit frame 301 is raised and needs to rotate according to the rotation of the tire.

[0046] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A rear wheel steering reset accuracy testing device, comprising a test stand (1), characterized in that: The platform (1) is provided with four groups of limit assemblies (3) corresponding to the wheels, and a plate rolling assembly (4) is rotatably mounted on the outer side of the limit assemblies (3), a lifting assembly (5) for driving the limit assemblies (3) to rise and fall is mounted on the bottom end of the limit assemblies (3), and a positioning assembly (7) is linked to one side of the lifting assembly (5), and the positioning assembly (7) is used to position the limit assemblies (3); The limiting assembly (3) comprises a limiting frame (301), and a clamping plate (302) is symmetrically arranged on the inner side of the limiting frame (301); The lifting assembly (5) comprises a first pulley group (502), a second pulley group (503) and a third pulley group (504), and one side of the second pulley group (503) is connected to a ratchet (505) via a shaft, a non-return mechanism is provided on the outer side of the ratchet (505), and one side of the ratchet (505) is connected to a transmission gear (506), a large gear (507) is meshed below the transmission gear (506), and a lifting gear (508) is provided on one side of the large gear (507), and one side of the lifting gear (508) is meshed with a tooth column (509), and the tooth column (509) is located at the bottom of the limit frame (301), and the tooth column (509) passes through the rotating platform (6) and is lifted and lowered inside the rotating platform (6); The positioning assembly (7) comprises a universal shaft (701), and one side of the end of the universal shaft (701) is connected to a rear pulley group (705) via a second bevel gear group (704), and the rear side of the rear pulley group (705) is connected to a rotating handle (706) and a lower slider (7061), the lower slider (7061) passes through a rotating rod (707), and the upper part of the rotating rod (707) is connected to a positioning handle (709) of a limited position limiting frame (301) via a second slider (708), and the shape of the positioning handle (709) matches that of the limited position limiting frame (301), and the rear side of the rotating rod (707) is connected to a back plate (710) and a front plate (712), and limited position grooves are provided in both the back plate (710) and the front plate (712).

2. The rear wheel steering reset accuracy testing device according to claim 1, characterized in that: A bottom bin (2) is arranged at the bottom end of the stand (1), the lifting assembly (5) and the positioning assembly (7) are both installed inside the bottom bin (2), and a rotating platform (6) is also arranged inside the bottom bin (2), the bottom end of the rotating platform (6) is connected to a column (601), the bottom end of the column (601) is provided with a rotating base (602), and the rotating platform (6) rotates inside the bottom bin (2) via the rotating base (602).

3. The rear wheel steering reset accuracy testing device according to claim 2, characterized in that: A cavity is provided at the middle position of the limit frame (301), a filling block is provided inside the cavity, and an angle sensor is installed on the outside of the limit frame (301); a fixing sleeve (401) is fixedly connected to the outside of the limit frame (301), and a through shaft (402) is rotatably penetrated inside the fixing sleeve (401); a spur gear set (403) is connected to the outside of the through shaft (402), and a connecting sleeve (404) is sleeved at the end of the through shaft (402); a short shaft (405) is sleeved inside the connecting sleeve (404) and located on the other side of the connecting sleeve (404), and a short shaft sleeve (406) is connected to the end of the short shaft (405); and a folding plate (407) is connected to the outside of the connecting sleeve (404).

4. The rear wheel steering reset accuracy testing device according to claim 3, characterized in that: The number of the folding plates (407) is four, and the four folding plates (407) are all arc plate structures. The four folding plates (407) can be turned over and folded outside the limiting frame (301).

5. The rear wheel steering reset accuracy testing device according to claim 4, characterized in that: The lifting assembly (5) comprises a motor (501), and the output end of the motor (501) is connected to a first pulley group (502), the first pulley group (502) is connected to a second pulley group (503) via a belt in a vertical direction, and the first pulley group (502) is connected to a driving pulley via a belt in a horizontal direction, one side of the driving pulley is connected to a mounting wheel (702), and the mounting wheel (702) is located at the end of the universal shaft (701).

6. The rear wheel steering reset accuracy testing device according to claim 5, characterized in that: The second pulley group (503) and the third pulley group (504) are connected by a belt, and a non-return mechanism is arranged on the outer side of the ratchet (505) and includes a fixed short column (5051), a pressing plate (5052), a non-return plate (5053) and a spring pressing plate (5054), and the pressing plate (5052) and the non-return plate (5053) are both connected to the two ends of the outer side of the fixed short column (5051) through a connecting sleeve, wherein a spring pressing plate (5054) is arranged above the non-return plate (5053), and the non-return plate (5053) is pressed by the spring pressing plate (5054) into the gap between the teeth of the ratchet (505).

7. The rear wheel steering reset accuracy testing device according to claim 6, characterized in that: One side of the third pulley group (504) is connected to a first bevel gear group (510), and the first bevel gear group (510) passes through the mounting frame (511) and is connected to a rotating column (512), a spiral strip (513) is arranged on the outside of the rotating column (512), and a lifting column (514) is arranged on one side of the rotating column (512) and is located inside the mounting frame (511), and a convex block (515) is connected to the outside of the lifting column (514), and the convex block (515) is located on one side of the spiral strip (513), a through column (516) is connected below the lifting column (514), and the through column (516) passes through the mounting frame (511) and extends to the outside thereof, and a spring is sleeved on the inner part of the through column (516) located on the inner side of the mounting frame (511).

8. The rear wheel steering reset accuracy testing device according to claim 7, characterized in that: The universal shaft (701) comprises two disconnected shafts, the ends of the two disconnected shafts are both connected to hinged joints (703), and the two disconnected shafts are connected via the hinged joints (703). The lower slider (7061) is located at the rear side of the rotating handle (706). The rotating rod (707) is provided with grooves on both upper and lower sides. The lower groove is penetrated by the lower slider (7061), and the upper groove is penetrated by the second slider (708). A fixed block (7071) is provided at the bottom end of the rotating rod (707), and the rotating rod (707) rotates on one side of the fixed block (7071).

9. The rear wheel steering reset accuracy testing device according to claim 8, characterized in that: The second slider (708) comprises a slider portion, a vertical shaft portion and a positioning column (7081), wherein the slider portion is located at the front side of the vertical shaft portion, the positioning column (7081) is located at the rear side of the vertical shaft portion, and the positioning handle (709) is located at the top end of the vertical shaft portion, a V-groove (711) is provided in the back plate (710), and a straight groove (713) is provided in the front plate (712), the slider portion passes through the straight groove (713) and extends to the outside thereof, and the positioning column (7081) passes through the V-groove (711) and moves inside thereof, and the vertical shaft portion is located between the front plate (712) and the back plate (710).

10. The testing method of the rear wheel steering reset accuracy testing device according to claim 9, characterized in that: The following steps are involved: Step 1: The vehicle to be tested is driven onto the test bench (1), the positions of the four groups of limit assemblies (3) correspond to the positions of the four groups of tires, the motor (501) is started, and the limit frame (301) and the clamping plate (302) that clamps the tire inward are used to make the limit frame (301) and the tire angle consistent. The process is that after the motor (501) is started, it will drive the first pulley group (502), the second pulley group (503) and the third pulley group (504) to rotate, wherein the rotation of the second pulley group (503) will drive the ratchet (505) and the transmission gear (506) to rotate, and the transmission When the gear (506) rotates, it drives the large gear (507) to rotate through meshing. The rotation of the large gear (507) drives the lifting gear (508) to rotate, thereby driving the tooth column (509) to rise. The four groups of tooth columns (509) rise synchronously, thereby driving the limit frame (301) and the clamping plate (302) to rise. The activated clamping plate (302) clamps the tire. When the ratchet (505) rotates, the check plate (5053) is pressed by the spring pressure plate (5054) so ​​that it is uniformly clamped in the teeth of the ratchet (505), thereby preventing the ratchet (505) from reversing. Step 2: At this time, the positioning handle (709) rotates due to the transmission of the first pulley group (502) and the transmission pulley group, so that it is separated from the limit frame (301) and no longer restricts the limit frame (301). Therefore, the limit frame (301) follows the rotation of the tire. In order not to interfere with the rotation of the limit frame (301), the motor installed on one side of the flat gear group (403) can be started, so that the flat gear group (403) drives the through shaft (402) to rotate, thereby driving the connecting sleeve (404) to rotate, so that the connecting sleeve (404) drives the short shaft sleeve (406) to flip through the short shaft (405), so that the short shaft sleeve (406) drives the folding plate (407) to flip upward, so that there is a rotation space between the limit frame (301) and the fixed part of the stand (1). When the vehicle to be tested is turned off, the wheels do not return to the correct position. The accuracy of the active return of the wheels is observed through the angle detector installed on the limit frame (301); Step 3: After the inspection is completed, the motor on the rear side of the flat gear set (403) is started first, so that the four sets of folding plates (407) are turned down to facilitate the vehicle to drive out. After the staff controls the tire to return to the normal position and drive out, the motor (501) is controlled to rotate in the opposite direction. After starting, the first pulley set (502), the second pulley set (503), and the third pulley set (504) rotate synchronously. The third pulley set (504) drives the installation frame (511) to rotate through the first bevel gear set (510), so that the screw on the rotating column (512) is rotated. The rotating bar (513) rotates and simultaneously drives the protrusion (515) downward, so that the protrusion (515) drives the through column (516) downward, and the pressing plate (5052) is supported, so that the check plate (5053) is tilted up, counteracting the force of the spring in the spring pressing plate (5054), so that the second pulley set (503) will not be blocked by the check plate (5053) when driving the ratchet (505) to reverse, and the ratchet (505) drives the transmission gear (506) to rotate normally, so that the tooth column (509) is lowered; Step 4: The rotating first pulley group (502) drives the transmission pulley on one side to rotate through the belt, so the rotation is transmitted to the second bevel gear group (704) and the rear pulley group (705) through the mounting wheel (702), the hinge head (703) and the universal shaft (701), so that the rotating handle (706) drives the rotating rod (707) to rotate through the lower slider (7061). When the rotating rod (707) rotates, the second slider (708) inside it is limited by the straight groove (713), and the positioning column (7081) is limited by the V groove (711), so that the positioning handle (709) moves and rotates at the same time, so that the positioning handle (709) rotates to one side of the limit frame (301) to clamp it and prevent the limit frame (301) from rotating at will when no detection is required at the top.

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