Dynamic test bench of steering system

Abstract

The invention discloses a dynamic test bench of a steering system, and relates to the technical field of automobile part testing, and the dynamic test bench comprises a fixed clamping bench used for clamping a steering system assembly, and also comprises a driving unit used for driving wheels to rotate. The driving unit comprises a universal coupling used for being connected with the wheels, and the universal coupling is used for enabling the wheels to keep rotating in the steering process. And the road simulation mechanism is used for simulating a road and comprises a supporting rotary drum used for supporting wheels. The driving unit drives the wheels of the steering system assembly for simulation test to effectively rotate and move through the universal coupling, so that the wheels can still normally rotate even under the condition of in-situ steering, and a road with convex obstacles is simulated through the road simulation mechanism; the steering system assembly can conveniently control the simulation test under the condition that the protruding obstacle exists, and the height of the obstacle is automatically adjusted by means of the automatic protruding obstacle adjusting mechanism.

Description

Technical Field

[0001] This invention relates to the field of automotive component testing technology, and in particular to a dynamic test bench for a steering system. Background Technology

[0002] The car steering system is the most crucial interface between the driver and the vehicle's driving path, and its performance directly affects the vehicle's handling, stability, and driving safety. During the driving process, the ability of the car steering system to transmit torque normally is of paramount importance.

[0003] The prior art Chinese patent with authorization announcement number CN117760753B discloses a test device and test method for an automobile steering system, which includes a support frame and, from top to bottom, the following components installed on the support frame: a driving simulation unit for simulating driving conditions, a road simulation unit for simulating road conditions, and a control unit; this solution, through the cooperation of the driving simulation unit and the road simulation unit, can not only simulate complex driving conditions, but also complex road environments.

[0004] However, in the aforementioned existing solutions, when conducting simulated steering system component tests, the rotational power of the wheels comes from the friction of the conveyor belt on the simulated road surface. When the steering wheel turns, the wheel deflects at an angle, and the wheel's plane of rotation is no longer parallel to the direction of the conveyor belt's movement. This causes the conveyor belt to no longer effectively drive the wheel, instead resulting in severe lateral sliding with the tire tread. The huge, unrealistic sliding friction resistance severely interferes with the steering force test data and creates a strong false self-centering torque. At extreme deflection angles, the wheel may get stuck or disengage, interrupting the test. Furthermore, when simulating road obstacles, the aforementioned solutions mainly adjust the position of the protrusions of the simulated obstacles by pushing them with push rods, failing to achieve continuous, smooth, and automatic changes in the height of the protrusions during the obstacle's movement. This limits experimental research on the dynamic response of the steering system under continuously changing impact loads, resulting in poor overall test performance, unreliable test results, and inconvenient operation. Summary of the Invention

[0005] The purpose of this invention is to provide a dynamic test bench for steering systems to solve the technical problems of insufficient test results, unreliable test results, and inconvenient operation of existing automotive steering systems.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution: A dynamic test bench for a steering system includes a fixed clamping platform for mounting steering system components, and further includes: A drive unit for driving the rotation of a wheel; the drive unit includes a universal coupling for connecting the wheel, the universal coupling being used to keep the wheel rotating during steering; A road simulation mechanism for simulating roads includes a support cylinder for supporting wheels, and an automatically adjusting protrusion obstacle mechanism is provided on the support cylinder for forming protrusions on the surface of the support cylinder.

[0007] Preferably, the drive unit further includes a mounting bracket and a transmission mechanism. Two mounting brackets are provided and symmetrically distributed on both sides of the steering system assembly. Two sets of universal couplings are provided. One end of each set of universal couplings is rotatably connected to the mounting bracket, and the other end is connected to the corresponding wheel axle. The two sets of universal couplings are connected by a transmission mechanism.

[0008] Preferably, each set of universal couplings includes an intermediate shaft and a ball-cage universal joint; two ball-cage universal joints are provided, one end of the intermediate shaft is connected to the wheel axle through one of the ball-cage universal joints, and the other end is rotatably connected to the mounting bracket through the other ball-cage universal joint.

[0009] Preferably, the transmission mechanism includes a linkage shaft and a synchronous belt; the linkage shaft is laterally rotatably connected between the mounting shaft brackets, and each set of universal couplings has a synchronous pulley coaxially fixedly connected to one end of the mounting shaft bracket and both ends of the linkage shaft, and the synchronous pulley of the universal coupling and the synchronous pulley of the linkage shaft are connected by a synchronous belt.

[0010] Preferably, the universal coupling is fixedly connected to a connecting sleeve at one end near the wheel, and the wheel is coaxially fixedly connected to an extension column that fits and passes through the connecting sleeve. Both the connecting sleeve and the extension column are provided with threaded through holes that fit and align with each other, and a fixing bolt is threadedly connected to the threaded through hole.

[0011] Preferably, the automatic adjustment protrusion obstacle mechanism includes a reciprocating lead screw, an undulating sleeve, and sliding protrusions; the reciprocating lead screw is coaxially disposed inside the supporting rotary cylinder; a lead screw sleeve is fitted onto the reciprocating lead screw; a guide rod is disposed inside the supporting rotary cylinder, penetrating the side wall of the lead screw sleeve, and a support connection mechanism for fixing the support guide rod is also disposed at one end of the supporting rotary cylinder; the undulating sleeve is coaxially fixedly connected to the outside of the lead screw sleeve; multiple sliding protrusions are disposed and are equidistantly distributed around the circumference of the supporting rotary cylinder, each sliding protrusion slidingly penetrating the side wall of the supporting rotary cylinder, and a universal ball assembly that cooperates with the undulating sleeve is connected to one side of each sliding protrusion inside the supporting rotary cylinder.

[0012] Preferably, the undulating sleeve includes multiple convex sleeves of different heights, each convex sleeve has tapered surfaces symmetrically distributed on both sides, and the two tapered surfaces can be connected by a planar transition.

[0013] Preferably, the road simulation mechanism further includes a lifting platform and a first electric telescopic rod, the first electric telescopic rod being fixedly connected to the support base, the lifting platform being horizontally fixedly connected to the telescopic end of the first electric telescopic rod, and the support rotating cylinder being rotatably mounted on the lifting platform.

[0014] Preferably, the support connection mechanism includes a mounting frame, a connecting plate, and a fixing plate; the mounting frame is fixedly connected to the lifting support plate, and the fixing plate is fixedly connected to the side of the mounting frame near the supporting rotating cylinder; the connecting plate is arranged parallel to the side of the fixing plate near the supporting rotating cylinder, and the connecting plate is fixedly connected to the guide rod; the fixing plate has an eccentric fixing hole; the connecting plate has a plurality of fixing rods circumferentially distributed at equal intervals that mate with the fixing holes; each fixing rod transversely penetrates the connecting plate and is connected to the connecting plate by a first spring; an electromagnet is also fixedly connected to the mounting frame; each fixing rod is a magnetic metal body.

[0015] Preferably, a docking post is provided on one side of the connecting plate, and a docking groove is provided at the end of the reciprocating lead screw to cooperate with the docking post; a locking block is fixedly provided at the end of the docking post near the docking groove; a locking groove is provided on the inner side of the docking groove to cooperate with the locking block, and multiple locking grooves are evenly distributed around the circumference; a square post that slides through the center of the connecting plate is coaxially fixedly connected to the end of the docking post away from the locking block, and a second spring is connected between the square post and the connecting plate; a magnetic column is coaxially fixedly connected to the end of the square post away from the docking post.

[0016] The beneficial effects of this invention are: 1. The drive unit of this invention uses a universal coupling to drive the wheels of the steering system components used for simulation testing to rotate effectively, so that the wheels can still rotate normally even when turning in place, thereby facilitating more realistic steering test detection and enhancing the test effect.

[0017] 2. This invention uses a road simulation mechanism to simulate roads with protruding obstacles, facilitating the operation simulation test of steering system components in the presence of protruding obstacles. Furthermore, by automatically adjusting the height of the obstacles through an automatic obstacle adjustment mechanism, the height of the protruding obstacles can be automatically, continuously, and irregularly changed during the rotation of the roller. This allows for a more realistic reproduction of complex road conditions, testing the dynamic response and reliability of the steering system under continuously changing disturbances, and is also easy to operate.

[0018] 3. During the rotation of the wheel driven by the universal coupling of the present invention, the wheel drives the supporting drum to rotate by friction. During the rotation of the supporting drum, the supporting drum drives the set reciprocating lead screw to rotate. The reciprocating lead screw drives the set undulating sleeve to move laterally through the lead screw sleeve. The undulating sleeve relies on the sliding protrusions distributed by multiple convex sleeves of different heights to make the sliding protrusions continuously and irregularly change different heights. This makes it easy for the wheel to continuously and irregularly press on obstacles of different heights, so as to carry out steering-related tests and detect steering performance data of the steering system during this process.

[0019] 4. When the present invention requires the sliding protrusion to be kept at a fixed height for testing the fixed parameters of the steering system components, the electromagnet is de-energized and loses its magnetic force. At this time, the fixed rod is disengaged from the fixed plate under the action of the spring rebound force, which facilitates the synchronous rotation of the guide rod and the lead screw sleeve with the reciprocating lead screw. This effectively prevents the lead screw sleeve and the undulating sleeve from moving laterally relative to the reciprocating lead screw, thus ensuring that the sliding protrusion has no height change relative to the supporting cylinder and remains at the corresponding height, which is convenient for relevant tests. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the invention. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of the present invention without the steering system components installed; Figure 4 This is a schematic diagram of the structure in which the wheel and the supporting rotating cylinder are connected in this invention; Figure 5 This is a schematic diagram of the structure in which the connecting sleeve and the extension column are fitted together in this invention; Figure 6 This is a schematic diagram of the structure in which the undulating sleeve and the sliding protrusion are engaged and connected in this invention; Figure 7 This is a cross-sectional schematic diagram of the connection between the sliding protrusion and the supporting rotating cylinder in this invention; Figure 8 This is a schematic diagram of the structure in which the undulating sleeve and the reciprocating lead screw are connected in this invention; Figure 9 This is a schematic diagram of the connection between the connecting disk and the fixed disk in this invention; Figure 10 This is a schematic diagram of the structure of the fixed disk in this invention; Figure 11 This is a schematic diagram of the structure connecting the fixed insertion rod, the docking post, and the connecting plate in this invention; Figure 12 This is a schematic diagram of the docking post structure in this invention; Figure 13 This is a schematic diagram of the docking groove in this invention; Figure 14 This is a schematic diagram showing the state in which the connecting disk and the fixed disk remain fixed relative to each other in this invention; Figure 15 This is a schematic diagram showing the state in which the connecting disk can rotate relative to the fixed disk in this invention; Figure 16 This is a schematic diagram of the structure in which the wheel and the disc are connected in this invention.

[0021] Explanation of reference numerals in the attached figures: 1. Support base; 2. Steering system components; 21. Steering wheel; 22. Wheel; 221. Wheel disc; 23. Axle crossbeam; 3. Fixed clamping platform; 31. Fixed pressure block; 32. Second electric telescopic rod; 33. Array positioning column; 34. Support platform; 4. Road simulation mechanism; 41. Support cylinder; 42. Support ring; 43. Lifting pallet; 44. First electric telescopic rod; 45. Sliding protrusion; 451. Universal ball assembly; 452. Limiting groove; 46. Reciprocating lead screw; 461. Connecting groove; 462. Slot; 47. Lead screw sleeve; 4 71. Irregular sleeve; 48. Guide rod; 5. Drive unit; 51. Universal coupling; 511. Intermediate shaft; 512. Ball cage universal joint; 513. Extension column; 514. Fixing bolt; 515. Connecting sleeve; 52. Mounting shaft bracket; 53. Synchronous belt; 54. Linkage shaft; 55. Synchronous pulley; 6. Support connection mechanism; 61. Mounting bracket; 62. Electromagnet; 63. Fixing disc; 631. Fixing through hole; 64. Connecting disc; 65. Fixing insert rod; 66. Connecting column; 661. Locking block; 662. Square column; 663. Magnetic column. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0023] like Figures 1-16 As shown, a dynamic test bench for a steering system is used to perform dynamic control testing on the steering system component 2 of a car. The steering system component 2 mainly includes a steering wheel 21, a steering gear, an axle beam 23, and wheels 22. The connection and cooperation relationship between the various components can be based on the corresponding components of the actual car. That is, by rotating the steering wheel 21, the steering gear can drive the wheels 22 to turn in the correct direction, which is the prior art. The axle beam 23 is the main connecting component. In order to facilitate test control, the rotating shaft connected to the steering wheel 21 can be connected to the axle beam 23 through a shaft bracket. In addition, to facilitate the collection of relevant detection data, various detection sensors can be installed at corresponding positions in the steering system component 2 as needed. For example, force sensors, angle sensors, etc., can be installed on the shaft of the steering wheel 21, or a force sensor can be installed between the steering wheel 21 and the shaft to detect the force applied and the force or relative force when the steering wheel 21 is turned. A sensor for detecting the deflection angle of the wheel 22 can also be installed at the rotational connection between the wheel 22 and the axle beam 23. Alternatively, the driving simulation unit described in the cited comparative document can be used to control the steering wheel 21 to effectively detect the relevant steering parameters under the corresponding simulated operation.

[0024] To facilitate effective testing, the test bench includes a fixed clamping platform 3 for mounting the steering system component 2, ensuring stable fixation of the steering system component 2 for dynamic testing. The test bench also includes a drive unit 5 for rotating the wheel 22. The drive unit 5 includes a universal coupling 51 for connecting the wheel 22, which ensures the wheel 22 maintains its rotation during steering, preventing interference with the wheel 22's normal deflection adjustment direction. Additionally, the test bench includes a road simulation mechanism 4 for simulating road conditions. The road simulation mechanism 4 includes a support cylinder 41 for supporting the wheel 22. The support cylinder 41 is equipped with an automatically adjusting raised obstacle mechanism, which forms protrusions on the surface of the support cylinder 41 to simulate the wheel 22 traveling on uneven road surfaces, thus facilitating the detection of the impact on the wheel 22's deflection operation.

[0025] In some specific implementation schemes, refer to Figure 2 As shown, the drive unit 5 also includes a mounting bracket 52 and a transmission mechanism. There are two mounting brackets 52, which are symmetrically distributed on both sides of the steering system component 2. Specifically, the test bench is equipped with a support base 1, and the mounting brackets 52 can be symmetrically and vertically fixedly connected to the two sides of the support base 1. There are two sets of universal couplings 51. One end of each set of universal couplings 51 is rotatably connected to the mounting bracket 52, and the other end is connected to the axle of the corresponding wheel 22. The two sets of universal couplings 51 are connected by a transmission mechanism to move synchronously. A drive motor is fixedly installed on one of the mounting brackets 52, and the drive motor is used to drive the corresponding universal coupling 51 to rotate the wheel 22.

[0026] In a further specific implementation, each set of universal couplings 51 includes an intermediate shaft 511 and a ball cage universal joint 512; there are two ball cage universal joints 512. One end of the intermediate shaft 511 is connected to the axle of the wheel 22 through one ball cage universal joint 512, and the other end is rotatably connected to the mounting bracket 52 through another ball cage universal joint 512. Here, the ball cage universal joint 512 is an existing structure. When the drive motor drives the entire universal coupling 51 to rotate, the universal coupling 51 can drive the wheel 22 to rotate. When the wheel 22 deflects, the ball cage universal joint 512 facilitates the intermediate shaft 511 to deflect relative to the wheel 22 at an angle, avoiding interference. At the same time, it can maintain power transmission, realize the complete decoupling of the wheel 22's drive and steering, eliminate the problem of sliding friction, ensure that the wheel 22 is effectively driven, and facilitate close to the actual operating state. Furthermore, the intermediate shaft 511 can be a telescopic shaft, which includes a square sleeve and a square rod that slides through the square sleeve, so that when the wheel 22 presses on a raised obstacle and causes undulation, the effective length of the intermediate shaft 511 changes, thus avoiding motion interference.

[0027] In some specific implementation schemes, refer to Figure 2 As shown, the transmission mechanism includes a linkage shaft 54 ​​and a synchronous belt 53. The linkage shaft 54 ​​is laterally rotatably connected between the mounting brackets 52. Each set of universal couplings 51 is coaxially fixedly connected to one end of the mounting bracket 52 and both ends of the linkage shaft 54 ​​with a synchronous pulley 55. The synchronous pulleys 55 of the universal couplings 51 and the synchronous pulleys 55 of the linkage shaft 54 ​​are connected by the synchronous belt 53. Thus, when one side of the universal coupling 51 is driven to rotate by a motor, the linkage shaft 54 ​​can be driven to rotate through the corresponding synchronous pulley 55 and the synchronous belt 53. The linkage shaft 54 ​​then causes the universal coupling 51 on the other side to rotate, realizing the synchronous rotation of the universal couplings 51 on both sides. In this way, the wheels 22 on both sides can be rotated synchronously.

[0028] In other specific implementation schemes, refer to Figure 4 and Figure 5 As shown, in order to facilitate the effective disassembly and assembly of wheel 22 and universal coupling 51, a connecting sleeve 515 is fixedly connected to one end of universal coupling 51 near wheel 22. Specifically, the connecting sleeve 515 is coaxially fixedly connected to the corresponding ball joint 512. An extension column 513 is coaxially fixedly connected to the center of wheel 22 and inserted into the connecting sleeve 515. Both the connecting sleeve 515 and the extension column 513 have threaded through holes that align with each other, and a fixing bolt 514 is threaded into the threaded through hole. This allows the connecting sleeve 515 and the extension column 513 to be relatively fixed, facilitating transmission. When it is necessary to disassemble and separate wheel 22 and universal coupling 51, the fixing bolt 514 is loosened and removed to achieve separation, making it easy to remove the entire steering system component 2.

[0029] In some specific implementations, the supporting drum 41 rotates passively due to friction during the rotation of the wheel 22; to facilitate automatic adjustment of the raised obstacle mechanism, the supporting drum 41 can rotate automatically for adjustment during rotation; see reference. Figure 6 and Figure 7 As shown, the automatic adjustment mechanism for the raised obstacle includes a reciprocating lead screw 46, an undulating sleeve 471, and a sliding protrusion 45. The reciprocating lead screw 46 is coaxially disposed inside the supporting rotating cylinder 41, and the reciprocating lead screw 46 can rotate synchronously with the supporting rotating cylinder 41. A lead screw sleeve 47 is fitted onto the reciprocating lead screw 46. A guide rod 48 is disposed inside the supporting rotating cylinder 41, penetrating the side wall of the lead screw sleeve 47, and a support connection mechanism 6 for fixing the support guide rod 48 is also disposed at one end of the supporting rotating cylinder 41. The guide rod 48 does not rotate with the supporting rotating cylinder 41, and there is no motion interference between the two. The reciprocating lead screw 46 rotates together with the supporting rotating cylinder 41, which allows the lead screw sleeve 47 to move along the... The reciprocating lead screw 46 moves laterally under the guidance of the guide rod 48; the undulating sleeve 471 is coaxially fixedly connected to the outside of the lead screw sleeve 47; multiple sliding protrusions 45 are provided and are equidistantly distributed around the support cylinder 41. Each sliding protrusion 45 slides through the side wall of the support cylinder 41. Each sliding protrusion 45 is connected to a universal ball assembly 451 that cooperates with the undulating sleeve 471 through a columnar body on one side inside the support cylinder 41. The universal ball assembly 451 specifically includes a ball sleeve and a movable ball that is movably fitted in the ball sleeve. The movable ball is used to press against the undulating sleeve 471, and the ball sleeve is used to fixally connect with the sliding protrusion 45.

[0030] Among them, reference Figure 8 As shown, the undulating sleeve 471 includes multiple convex sleeves of different heights. Each convex sleeve has symmetrically distributed conical surfaces on both sides, and the two conical surfaces can be connected by a plane transition. The height of the distributed convex sleeves varies irregularly and is different from each other. Thus, when the lead screw sleeve 47 moves laterally along the reciprocating lead screw 46, it drives the undulating sleeve 471 to move. When each convex sleeve of the undulating sleeve 471 passes the position of the sliding convex block 45, the convex sleeve, relying on the conical surface on the advancing side, simultaneously presses the universal ball assembly 451 on the circumferentially distributed sliding convex block 45. During the conical surface pressing process, a force is generated along the supporting rotating cylinder 41. The radial component of the force facilitates the sliding protrusions 45 distributed circumferentially to slide outwards from the supporting rotating cylinder 41 by a certain distance. The supporting rotating cylinder 41, driven by the friction of the wheel 22, rotates the distributed sliding protrusions 45, making it easy to pass under the wheel 22 one by one, thus simulating obstacles on the road surface. During this process, the steering wheel 21 can be used to control the deflection direction of the wheel 22 for related tests. Furthermore, when passing through protrusions at different positions, the sliding protrusions 45 can be raised to different heights, making it convenient to test the effect of the wheel 22 deflecting when it presses on the sliding protrusions 45 at different heights.

[0031] Of course, the sliding protrusion 45 can also be configured as an inclined structure on one side inside the supporting rotating cylinder 41, and the two sides of the inclined structure are symmetrically distributed inclined surfaces, which cooperate with the conical surface of the sleeve, and can also generate radial thrust when they are squeezed together.

[0032] In addition, to prevent the sliding protrusion 45 from falling off, a limiting groove 452 is provided on both sides of each sliding protrusion 45; a slider that is fixedly connected to the supporting rotating cylinder 41 is slidably connected in each limiting groove 452; and a limiting spring can also be connected between the sliding protrusion 45 and the supporting rotating cylinder 41. Of course, a larger spring is selected here to ensure that it can effectively withstand the influence of centrifugal force and prevent the sliding protrusion 45 from extending out of the supporting rotating cylinder 41 under the action of centrifugal force.

[0033] It should also be noted that, in order to facilitate the normal undulation of wheel 22 when it presses on the raised sliding bump 45, refer to Figure 16 As shown, a wheel disc 221 can also be provided on one side of the wheel 22. The wheel disc 221 is connected to the steering knuckle of the steering system component 2. When the steering wheel 21 is turned, the wheel disc 221 turns with the steering knuckle, thereby driving the wheel 22 to turn. At the same time, a T-shaped groove or a guide rail is opened on the wheel disc 221, and a slider is slidably installed in the T-shaped groove or guide rail. The wheel axle of the wheel 22 is rotatably connected to the slider, and a support spring is connected between the slider and the T-shaped groove or guide rail.

[0034] In some specific implementations, to ensure that the supporting rotating cylinder 41 can effectively abut against the underside of the wheel 22, the road simulation mechanism 4 also includes a lifting plate 43 and a first electric telescopic rod 44. The first electric telescopic rod 44 is fixedly connected to the supporting base 1 and multiple rods can be distributed laterally. The lifting plate 43 is horizontally fixedly connected to the telescopic end of the first electric telescopic rod 44. The supporting rotating cylinder 41 is rotatably mounted on the lifting plate 43. Specifically, support rings 42 can be provided at both ends of the supporting rotating cylinder 41. The support rings 42 are fixedly connected to the lifting plate 43 through brackets, and the support rings 42 are rotatably sleeved on the outside of the supporting rotating cylinder 41. A limit stop ring is also coaxially fixedly connected to the outer wall of the supporting rotating cylinder 41. The limit stop ring is located on the outer side of the support ring 42 to restrict axial relative displacement between the support ring 42 and the supporting rotating cylinder 41. When the rotation of the supporting rotating cylinder 41 can be ensured, the first electric telescopic rod 44 can be extended upward, causing the lifting plate 43 to drive the supporting rotating cylinder 41 to rise.

[0035] Alternatively, with the lifting plate 43 present, or by directly installing a servo motor on the support base 1, the reciprocating screw 46 can be rotatably positioned at the center of the support drum 41 via bearings. The servo motor then drives the reciprocating screw 46 to rotate, facilitating control of its speed according to actual needs. This effectively controls the speed and position of the screw sleeve 47 driving the undulating sleeve 471, thereby facilitating control of the protrusion height of the sliding protrusion 45. Alternatively, when the reciprocating screw 46 is rotatably positioned inside the support drum 41 via bearings, a gear ring can be coaxially fixedly connected to the outside of the support drum 41. A larger linkage gear can then be rotatably mounted on the lifting plate 43 via a bracket. This linkage gear can be coaxially fixedly connected to a transmission wheel on the reciprocating screw 46, with the two transmission wheels connected by a transmission belt. This ensures that the reciprocating screw 46 rotates at a lower speed, avoiding a higher speed synchronized with the support drum 41, which would affect the control of the protrusion height of the sliding protrusion 45.

[0036] In some specific implementations, when it is necessary to fix the height of the sliding protrusion 45 to facilitate continuous testing of the wheel 22 on the fixed sliding protrusion 45, refer to... Figures 9 to 13 As shown, the support connection mechanism 6 includes a mounting frame 61, a connecting plate 64, and a fixing plate 63. The mounting frame 61 is fixedly connected to the lifting support plate 43, and the fixing plate 63 is fixedly connected to the side of the mounting frame 61 near the supporting rotating cylinder 41. The mounting frame 61 can be a U-shaped frame, with the U-shaped opening facing the supporting rotating cylinder 41. The connecting plate 64 is arranged parallel to the side of the fixing plate 63 near the supporting rotating cylinder 41, and the connecting plate 64 is fixedly connected to the guide rod 48. The central axes of the connecting plate 64, the fixing plate 63, and the supporting rotating cylinder 41 coincide. The fixing plate 63 has an eccentric fixing hole 631. The connecting plate 64 has multiple fixing rods 65 equidistantly distributed circumferentially to cooperate with the fixing holes 631. Each fixing rod 65 passes through the connecting plate 64 laterally and is connected to the connecting plate 64 by a first spring. An electromagnet 62 is also fixedly connected to the mounting frame 61. Each fixing rod 65 is a magnetic metal body, such as iron.

[0037] When the electromagnet 62 is not energized, the first spring is in its normal state and not deformed. The ends of the distributed fixed rods 65 are only in sliding contact with the side face of the fixed disk 63 facing the supporting rotating cylinder 41. At this time, the guide rod 48 and the lead screw sleeve 47 can rotate together with the reciprocating lead screw 46, so there will be no lateral movement of the undulating sleeve 471 relative to the reciprocating lead screw 46. When the electromagnet 62 is energized and generates magnetic force, the distributed fixed rods 65 will abut against the surface of the fixed disk 63 under the action of magnetic force. If there is a fixed rod 65 that is aligned with the eccentrically set fixed through hole 631 on the fixed disk 63, the fixed rod 65 will directly pass through the fixed through hole 631, so that the connecting disk 64 and the guide rod 48 cannot rotate with the reciprocating lead screw 46, thereby rotating the lead screw sleeve 47. The limit position facilitates normal lateral movement under the rotation of the reciprocating screw 46. Even if no fixed insertion rod 65 is aligned with the fixed through hole 631, when the connecting plate 64 rotates with the reciprocating screw 46 carrying the distributed fixed insertion rods 65, one fixed insertion rod 65 will inevitably coincide with the position of the fixed through hole 631. This allows it to pass through the fixed through hole 631 under the action of magnetic force, achieving effective docking. In this way, the position of the undulating sleeve 471 on the screw sleeve 47 can be adjusted automatically and continuously, thereby continuously adjusting the height position of the sliding protrusion 45. If it is necessary to stop the sliding protrusion 45 at the corresponding height position, the electromagnet 62 can be de-energized and lose its magnetic force. In this way, the corresponding fixed insertion rod 65 will be reset and disengaged from the fixed plate 63 under the action of the first spring return force.

[0038] In addition, to facilitate the determination of the height position of the sliding bump 45, a position measuring element, such as a displacement sensor or a positioner, can be installed on the lead screw sleeve 47.

[0039] In a further specific implementation, in order to ensure that the connecting plate 64 can maintain a certain stability relative to the reciprocating lead screw 46 after the fixed rod 65 is separated from the fixed plate 63, it is convenient to ensure that the sliding protrusion 45 is stably maintained at the corresponding height position; Reference Figures 11 to 15 As shown, a docking post 66 is provided on one side of the connecting plate 64, and a docking groove 461 that mates with the docking post 66 is provided at the end of the reciprocating screw 46; a locking block 661 is fixedly provided at the end of the docking post 66 near the docking groove 461; a locking groove 462 that mates with the locking block 661 is provided on the inner side of the docking groove 461, and multiple locking grooves 462 are evenly distributed around the circumference; a square post 662 that slides through the center of the connecting plate 64 is coaxially fixedly connected to the end of the docking post 66 away from the locking block 661, and a second spring is connected between the square post 662 and the connecting plate 64; a magnetic column 663 that is coaxially fixedly connected to the end of the square post 662 away from the docking post 66, the magnetic column 663 can be made of iron and is cylindrical, facing the center of the fixed plate 63; a hole can be opened at the center of the fixed plate 63 to facilitate the magnetic force of the electromagnet 62 to act on the magnetic column 663.

[0040] like Figure 15 As shown, when the electromagnet 62 is de-energized, the second spring is in its normal state and undeformed. At this time, the docking post 66, with the locking block 661, is inserted into the docking slot 461, and the locking block 661 engages with the locking slot 462. It should be noted that even if the locking block 661 and the locking slot 462 are not fully aligned, the second spring is compressed to a certain extent and has a restoring force. Therefore, even if relative rotation occurs between the reciprocating screw 46 and the docking post 66, it can still ensure that the locking block 661 eventually aligns with the locking slot 462, facilitating docking. At this point, the square column 662 is not detached from the connecting plate 64 and cannot rotate relative to the connecting plate 64; it can only slide axially. When the electromagnet 62 is energized and generates magnetic force, it attracts the magnetic column 663, causing the square column 662 and the docking column 66 to slide laterally and compress the second spring. At this time, the locking block 661 on the docking column 66 disengages from the locking groove 462. The docking column 66 does not need to completely disengage from the docking groove 461, facilitating auxiliary support for the reciprocating lead screw 46. (See reference for details.) Figure 14 As shown.

[0041] In other specific implementation schemes, refer to Figures 1 to 3 As shown, the fixed clamping platform 3 includes a support platform 34, array positioning columns 33, and fixed pressure blocks 31. The support platform 34 can be fixedly installed on the support base 1 by a bracket and is centrally located. Two sets of array positioning columns 33 are provided and fixedly connected to both sides of the support platform 34. The two ends of the axle crossbeam 23 of the steering system component 2 have positioning holes that cooperate with the array positioning columns 33. A second electric telescopic rod 32 is vertically fixedly connected to the support platform 34. Two fixed pressure blocks 31 are provided and are correspondingly parallel to each other above the array positioning columns 33. Both fixed pressure blocks 31 have array holes for the array positioning columns 33 to pass through. The fixed pressure blocks 31 are fixedly connected to the telescopic end of the second electric telescopic rod 32 through a truss.

[0042] When it is necessary to fix the entire steering system component 2, the axle crossbeam 23 is placed on the support platform 34, and the positioning holes distributed on the axle crossbeam 23 are aligned with the array positioning posts 33. Then they are inserted together, and the second electric telescopic rod 32 is controlled to retract, which drives the fixing blocks 31 on both sides to descend and press on the axle crossbeam 23 to achieve clamping and fixing.

[0043] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios: First, the steering system component 2 is fixedly positioned using the fixed clamping platform 3, and various corresponding detection switches or sensors are installed at the corresponding parts of the steering system component 2. Then, the first electric telescopic rod 44 extends upward, causing the lifting plate 43 to drive the support rotating cylinder 41 to rise, so that the support rotating cylinder 41 effectively contacts the bottom of the wheel 22. Then, the motor connected to the universal coupling 51 on one side is started, causing the universal coupling 51 to drive the corresponding wheel 22 to rotate. At the same time, the corresponding synchronous pulley 55 and synchronous belt 53 can also drive the linkage shaft 54 ​​to rotate, which in turn causes the universal coupling 51 on the other side to rotate, realizing the synchronous rotation of the universal couplings 51 on both sides. In this way, the wheels 22 on both sides can rotate synchronously. The rotating wheel 22 drives the support rotating cylinder 41 to rotate by friction. The support rotating cylinder 41 is provided with sliding protrusions 45 to facilitate the simulation of uneven road surfaces.

[0044] Furthermore, during the rotation of the supporting cylinder 41, the reciprocating screw 46 rotates synchronously, and the screw sleeve 47 moves laterally along the reciprocating screw 46, driving the undulating sleeve 471 to move. When each convex sleeve of the undulating sleeve 471 passes the position of the sliding convex block 45, the convex sleeve relies on the conical surface on the forward side to simultaneously press the universal ball assembly 451 on the circumferentially distributed sliding convex block 45. During the pressing process of the conical surface, a radial component force is generated along the supporting cylinder 41, which facilitates pushing the circumferentially distributed sliding convex block 45 to slide out of the supporting cylinder 41 a certain distance. During this process, the steering wheel 21 can be used to control the deflection direction of the wheel 22 to conduct relevant tests. Furthermore, when passing through convex sleeves at different positions, the sliding convex block 45 can be raised to different heights, which is convenient for testing the effect of the wheel 22 continuously pressing on the sliding convex block 45 at different heights.

[0045] During the continuous height change of the sliding protrusion 45, the electromagnet 62 is energized and generates magnetic force. The fixed rods 65 distributed on the connecting plate 64 abut against the surface of the fixed plate 63 under the action of magnetic force. Furthermore, one fixed rod 65 passes directly through the eccentric fixed through hole 631 on the fixed plate 63 under the action of magnetic force, so that the connecting plate 64 and the guide rod 48 cannot rotate with the reciprocating screw 46, thereby limiting the rotation direction of the screw sleeve 47 and facilitating its normal lateral movement under the rotation of the reciprocating screw 46.

[0046] If it is necessary to stop the sliding protrusion 45 at the corresponding height position, the electromagnet 62 can be de-energized and lose its magnetic force. In this way, the corresponding fixed insertion rod 65 will be reset and disengaged from the fixed plate 63 under the action of the first spring's rebound force. The docking post 66 with the locking block 661 is inserted into the docking groove 461, and the locking block 661 cooperates with the locking groove 462 to ensure that after the fixed insertion rod 65 is separated from the fixed plate 63, the connecting plate 64 can maintain a certain stability relative to the reciprocating screw 46, thereby facilitating the stable maintenance of the sliding protrusion 45 at the corresponding height position.

[0047] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A dynamic test bench for a steering system, comprising a fixed clamping platform (3) for mounting steering system components (2), characterized in that, Also includes: A drive unit (5) for driving the rotation of the wheel (22); the drive unit (5) includes a universal coupling (51) for connecting the wheel (22), the universal coupling (51) for enabling the wheel (22) to maintain its rotation during steering; Road simulation mechanism (4) for simulating roads, the road simulation mechanism (4) includes a support cylinder (41) for supporting wheels (22), the support cylinder (41) is provided with an automatic adjustment protrusion obstacle mechanism for forming protrusions on the surface of the support cylinder (41).

2. The dynamic test bench for a steering system according to claim 1, characterized in that, The drive unit (5) also includes a mounting bracket (52) and a transmission mechanism. There are two mounting brackets (52) and they are symmetrically distributed on both sides of the steering system assembly (2). There are two sets of universal couplings (51). One end of each set of universal couplings (51) is rotatably connected to the mounting bracket (52), and the other end is connected to the axle of the corresponding wheel (22). The two sets of universal couplings (51) are connected by a transmission mechanism.

3. The dynamic test bench for a steering system according to claim 2, characterized in that, Each set of universal couplings (51) includes an intermediate shaft (511) and a ball cage universal joint (512); there are two ball cage universal joints (512), one end of the intermediate shaft (511) is connected to the wheel axle of the wheel (22) through one of the ball cage universal joints (512), and the other end is rotatably connected to the mounting bracket (52) through the other ball cage universal joint (512).

4. The dynamic test bench for a steering system according to claim 2, characterized in that, The transmission mechanism includes a linkage shaft (54) and a synchronous belt (53); the linkage shaft (54) is laterally rotatably connected between the mounting brackets (52), and each set of universal couplings (51) is coaxially fixedly connected to one end of the mounting brackets (52) and both ends of the linkage shaft (54) with synchronous pulleys (55), and the synchronous pulleys (55) of the universal couplings (51) and the synchronous pulleys (55) of the linkage shaft (54) are connected by the synchronous belt (53).

5. A dynamic test bench for a steering system according to claim 1, characterized in that, The universal coupling (51) is fixedly connected to a connecting sleeve (515) at one end near the wheel (22). The center of the wheel (22) is coaxially fixedly connected to an extension column (513) that fits and passes through the connecting sleeve (515). Both the connecting sleeve (515) and the extension column (513) are provided with threaded through holes that fit and align with each other, and a fixing bolt (514) is threadedly connected in the threaded through hole.

6. The dynamic test bench for a steering system according to claim 1, characterized in that, The automatic adjustment protrusion obstacle mechanism includes a reciprocating lead screw (46), an undulating sleeve (471), and a sliding protrusion (45); the reciprocating lead screw (46) is coaxially disposed inside the support cylinder (41); a lead screw sleeve (47) is connected to the reciprocating lead screw (46); a guide rod (48) is disposed inside the support cylinder (41) and penetrates the side wall of the lead screw sleeve (47), and a support connection mechanism (6) for fixing the support guide rod (48) is also disposed at one end of the support cylinder (41); the undulating sleeve (471) is coaxially fixedly connected to the outside of the lead screw sleeve (47); multiple sliding protrusions (45) are disposed and are equidistantly distributed around the support cylinder (41) in the circumference, each sliding protrusion (45) slides through the side wall of the support cylinder (41), and a universal ball assembly (451) that cooperates with the undulating sleeve (471) is connected to one side of each sliding protrusion (45) inside the support cylinder (41).

7. A dynamic test bench for a steering system according to claim 6, characterized in that, The undulating sleeve (471) includes multiple convex sleeves of different heights. Each convex sleeve has tapered surfaces symmetrically distributed on both sides, and the two tapered surfaces can be connected by a planar transition.

8. A dynamic test bench for a steering system according to claim 6, characterized in that, The road simulation mechanism (4) further includes a lifting plate (43) and a first electric telescopic rod (44). The first electric telescopic rod (44) is fixedly connected to the support base (1). The lifting plate (43) is horizontally fixedly connected to the telescopic end of the first electric telescopic rod (44). The support rotating cylinder (41) is rotatably mounted on the lifting plate (43).

9. A dynamic test bench for a steering system according to claim 8, characterized in that, The supporting connection mechanism (6) includes a mounting frame (61), a connecting plate (64), and a fixing plate (63); the mounting frame (61) is fixedly connected to the lifting plate (43), and the fixing plate (63) is fixedly connected to the side of the mounting frame (61) near the supporting rotating cylinder (41); the connecting plate (64) is arranged parallel to the side of the fixing plate (63) near the supporting rotating cylinder (41), and the connecting plate (64) is fixedly connected to the guide rod (48); the fixing plate (63) is eccentrically provided with a fixing through hole (631); the connecting plate (64) is circumferentially distributed with multiple fixing rods (65) that cooperate with the fixing through hole (631); each fixing rod (65) transversely penetrates the connecting plate (64) and is connected to the connecting plate (64) by a first spring; an electromagnet (62) is also fixedly connected to the mounting frame (61); each fixing rod (65) is a magnetic metal body.

10. A dynamic test bench for a steering system according to claim 9, characterized in that, A docking post (66) is provided on one side of the connecting plate (64), and a docking groove (461) that mates with the docking post (66) is provided at the end of the reciprocating screw (46). A locking block (661) is fixedly provided at one end of the docking post (66) near the docking groove (461). A locking groove (462) that mates with the locking block (661) is provided on the inner side of the docking groove (461), and multiple locking grooves (462) are evenly distributed around the circumference. A square post (662) that slides through the center of the connecting plate (64) is coaxially fixedly connected to one end of the docking post (66) away from the locking block (661), and a second spring is connected between the square post (662) and the connecting plate (64). A magnetic column (663) is coaxially fixedly connected to one end of the square post (662) away from the docking post (66).

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