A vibration isolation device for a steering test bench

Abstract

The utility model relates to the field of automobile steering test discloses a vibration isolation device for steering test bench, aims at solving the problem that when the steering system test bench rigidly connects the steering sample, the input torque fluctuation is amplified by the steering angle sensor and disturbs the data, causes the sample to shake and influences the steering test accuracy of load system. The device includes input system, load system and the test sample of connecting both; the input system has input motor and first output shaft, and input motor drives first output shaft rotation. At least one first universal shaft is equipped between first output shaft and test sample top, and both are equipped with vibration isolation part at first universal shaft; the vibration isolation part contains rubber disc and the rigid connecting piece connected to both ends, and the rigid connecting piece is used for connecting first universal shaft and adjacent part to realize vibration isolation.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering testing, specifically to a vibration isolation device for a steering test bench. Background Technology

[0002] In the automotive industry, the steering system is a core component that ensures vehicle handling and safety. Its performance directly affects the overall driving experience and driving safety. To ensure that the steering system meets design standards before mass production, the industry generally uses steering system test benches to test steering system prototypes, covering key scenarios such as steering performance testing, durability testing, and abnormal noise testing. Among them, the steering angle sensor, as the core sensing component of the steering system, needs to monitor the steering wheel rotation angle, direction, and speed in real time, and transmit the data to the electronic control unit via the CAN bus. This provides key information for functions such as ESP / ESC vehicle dynamic control and EPS speed-sensitive power assist adjustment. Its installation position is mostly located at the bottom of the steering column, which is an important guarantee for the precise operation of the steering system.

[0003] Currently, the mainstream technical solutions for steering system test benches are built around simulating actual working conditions. The core structure includes four major modules: input system, load system, test specimens, and connecting components. The input system is used to simulate the torque input of the steering wheel, and closed-loop input can be achieved through angle control or torque control. The load system is used to simulate the load transmitted from the tires to the steering system. Test specimens include steering columns and steering assemblies consisting of steering columns and steering gears. The tie rods of the assembly test specimens are key components for load transmission, mainly bearing the push-pull load, while the load of the column test specimens is the torque load. The gear structure on the steering column generates displacement as the column or intermediate shaft rotates. The optocoupler element built into the steering angle sensor captures this displacement change in real time, converts it into a digital pulse signal or outputs an analog signal through resistance change, and then transmits the signal to the electronic control unit through the CAN bus. Finally, it realizes the accurate monitoring of the steering column rotation angle, direction, and speed, providing control basis for ESP / ESC and EPS systems. The connecting component is used to connect the input system to the steering wheel end of the test sample to transmit input power. In the existing technology, the connecting component mostly adopts a rigid connection method, such as a universal joint, etc. The rigid structure ensures the directness of power transmission, which is the conventional technical choice for the current test bench construction.

[0004] However, existing steering system test benches with rigid connections have significant technical drawbacks: the torque output from the input system is difficult to keep completely stable and is prone to slight fluctuations. The rigid connection directly transmits these torque fluctuations to the steering angle sensor of the test sample. Because the steering angle sensor has high sensitivity to achieve accurate signal acquisition, it further amplifies the transmitted torque fluctuations, which also causes varying degrees of vibration in the steering system sample. This vibration interferes with the accuracy of steering performance and durability tests. The additional vibrations caused by abnormal vibrations can mask or confuse the abnormal noise signals of the sample itself, making it difficult for the test results to truly reflect the actual abnormal noise situation of the steering system sample and meet the high-precision testing requirements of steering systems. Utility Model Content

[0005] This utility model aims to provide a vibration isolation device for a steering test bench, in order to solve the problem that when a steering system test bench is used to fix a steering sample through a rigid connection, the input torque fluctuation is amplified by the steering angle sensor, causing the sample to vibrate and interfering with the accuracy of the steering test involving the load system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a vibration isolation device for a steering test bench, comprising an input system, a load system, and a test sample connected between the input system and the load system. The input system is provided with an input motor and a first output shaft. The input motor is used to drive the first output shaft to rotate. At least one first universal joint is provided between the first output shaft and the top of the test sample. A vibration isolation part is provided at the first universal joint between the first output shaft and the test sample. The vibration isolation part includes a rubber disc and rigid connecting members connected to both ends of the rubber disc. The rigid connecting members are used to connect with the first universal joint and the adjacent part thereto.

[0007] The beneficial effects of this solution are as follows: by setting a vibration isolation part containing a rubber disc and a rigid connector at the first universal joint between the first output shaft and the test sample, the vibration of the input motor can be effectively blocked from being transmitted to the test sample, ensuring the accuracy of the steering performance test of the test sample; the first universal joint can compensate for the installation coaxiality deviation between the input system and the test sample, the rigid connector ensures stable power transmission, the overall structure is simple and highly adaptable, and can meet the vibration isolation and transmission requirements of the basic steering test bench.

[0008] Preferably, as an improvement, there are two first universal joints, which are respectively connected to the first output shaft and the steering column; the rigid connecting parts at both ends of the rubber disc are all set as sleeves, and the sleeves at both ends are used to fit with the shaft diameter of the first universal joints at both ends. The rubber disc is fixed with screws at both ends, and the sleeves are provided with connecting holes for the screws to pass through. The sleeves are provided with nuts for connecting with the screws, and the outer diameter of the nuts is larger than the diameter of the connecting holes.

[0009] The beneficial effects are as follows: using two first universal joints to connect the first output shaft and the steering column respectively can double compensate for installation deviations and further reduce deviation interference in the vibration transmission path; the rigid connecting parts are set as sleeves, which are fixed by the cooperation of screws and nuts, making installation and disassembly convenient, and can be adapted to first universal joints with different shaft diameters, and the connection is firm and not easy to loosen; the vibration isolation effect of the rubber disc is combined with the rigid fixation of the sleeve, which not only ensures the vibration isolation effect, but also improves the stability of power transmission.

[0010] Preferably, as an improvement, the first universal joint is configured as one, and the rigid connecting parts at both ends of the rubber disc are both configured as connecting discs, which are respectively the driving drive disc and the driven drive disc; the driving drive disc is used to connect with the first universal joint, and the driven drive disc is used to connect with the steering column.

[0011] The beneficial effects are as follows: setting only one first universal joint makes the overall structure more compact and reduces the space occupied; the connection method between the active drive disc and the driven drive disc increases the contact area with the rubber disc, universal joint / steering column, and the torque transmission is more uniform, avoiding excessive local stress; it is specifically adapted to the connection requirements of the steering column, and the vibration isolation part can accurately block vibration while transmitting power, improving the accuracy and reliability of individual testing of the steering column.

[0012] Preferably, as an improvement, the test specimen is configured as a steering column, and the load system is equipped with a load motor and a second output shaft. The load motor is used to drive the second output shaft to rotate. A second universal joint is provided between the second output shaft and the bottom end of the steering column, and the two ends of the second universal joint are connected to the steering column and the second output shaft respectively.

[0013] The beneficial effects are as follows: For standalone testing scenarios of the steering column, the connection between the load motor and the bottom of the steering column via the second universal joint can compensate for the installation deviation between the load system and the steering column; the first universal joint at the input end – the vibration isolation part – and the second universal joint at the output end form bidirectional deviation compensation and bidirectional vibration isolation, effectively blocking the mutual interference of vibrations at both ends of the input motor and the load motor, ensuring the accuracy of test data such as steering resistance and self-centering performance of the steering column; the structure is symmetrical and the transmission is efficient, adapting to the dynamic testing requirements of electric power steering systems.

[0014] Preferably, as an improvement, the test sample is configured as a steering assembly consisting of a steering gear and a steering column. The load system includes a load seat, a load motor mounted on the load seat, and a swing arm. The swing arm is connected to the tie rod of the steering assembly, and the load motor is used to drive the swing arm to swing.

[0015] The beneficial effects are: it can be adapted to complete steering assembly testing consisting of steering gear and steering column, expanding the applicability of the test bench; the load motor drives the steering assembly tie rod through the swing arm, simulating the actual steering load conditions during vehicle driving, making the test scenario more in line with real-world usage; the vibration isolation part can prevent the vibration of the load motor from being transmitted to the steering assembly, preventing vibration from interfering with the performance testing of the steering gear's transmission efficiency, steering accuracy, etc., and improving the reliability and data authenticity of assembly-level testing.

[0016] Preferably, as an improvement, the active drive plate and the driven drive plate are exactly the same in shape. Both are composed of a central circular plate and a three-pronged irregular plate fixed on the central circular plate, and the three-pronged irregular plate is arranged in a centrally symmetrical structure. At the same time, threaded holes are opened on the central circular plate and the three-pronged irregular plate. The active drive plate, the driven drive plate and the rubber disc are connected by bolts that pass through the three. The function of the bolts is to fix the active drive plate and the driven drive plate to the two ends of the rubber disc respectively.

[0017] The beneficial effects are as follows: the active and driven drive discs have the same shape, which facilitates processing, manufacturing, and mass production, reducing costs; the centrally symmetrical three-pronged irregular plate structure makes the drive disc bear force evenly, reduces stress concentration during vibration transmission, and improves torque transmission capability; the bolts pass through the central circular plate, the three-pronged irregular plate, and the rubber disc, providing high connection strength and effectively fixing the rubber disc, preventing it from shifting or falling off under high-frequency vibration, ensuring stable and consistent vibration isolation effect, while the increased connection area further improves transmission stability.

[0018] Preferably, as an improvement, the diameter of the triangular shaped plate is the same as the diameter of the rubber disc, and a limiting groove for defining the position of the bolt is formed between the triangular shaped plate and the central circular plate.

[0019] The beneficial effects are as follows: the diameter of the triangular irregular plate is the same as that of the rubber disc, so that the contact surfaces of the two are perfectly matched, the force is evenly distributed during vibration transmission, and local compression is avoided, which leads to premature aging of the rubber disc; the limiting groove can accurately limit the installation position of the bolt, prevent the bolt from loosening or shifting in the vibration environment, and improve the stability of the connection structure; the limiting groove can also reduce the direct pressure of the bolt head on the rubber disc, protect the vibration isolation performance of the rubber disc, extend the service life of the vibration isolation device, and ensure the reliability of long-term testing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the vibration isolation device and steering column installed on the test bench according to Embodiment 1 of this utility model; Figure 2 This is a schematic cross-sectional view of the vibration isolation device in Embodiment 1 of this utility model; Figure 3 This is a front view of the vibration isolation device used in Embodiment 2 of this utility model; Figure 4This is an exploded view of the vibration isolation device in Embodiment 2 of this utility model; Figure 5 This is a schematic diagram of the steering assembly of Embodiment 3 of this utility model installed on the test bench. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: input system 1, first output shaft 11, load system 2, second output shaft 21, steering column 3, steering angle sensor 31, first universal joint 4, vibration isolation part 5, rubber disc 51, screw 511, sleeve 52, connecting hole 521, nut 522, driving drive disc 53, driven drive disc 54, bolt 55, center circular plate 56, three-way shaped plate 57, threaded hole 58, limiting groove 59, second universal joint 6, steering gear 7.

[0022] Example 1 like Figures 1-2 The vibration isolation device for a steering test bench shown includes an input system 1, a load system 2, and a test specimen connected between the input system 1 and the load system 2. The test specimen is a steering column 3. The input system 1 is equipped with an input motor and a first output shaft 11. The input motor drives the first output shaft 11 to rotate. The load system 2 is equipped with a load motor and a second output shaft 21. The load motor drives the second output shaft 21 to rotate. Two interconnected first universal joints 4 are provided between the first output shaft 11 and the top of the test specimen. The opposite ends of the two first universal joints 4 are coaxially connected to the top of the first output shaft 11 and the top of the steering column 3, respectively. The first output shaft 11 and the steering column 3 are connected by the first universal joints 4. A vibration isolation section 5 is provided, which includes a rubber disc 51 and steel sleeves 52 connected to both ends of the rubber disc 51. The shaft diameter ends of the two first universal joints 4 facing each other are respectively sleeved with the sleeves 52 at both ends of the vibration isolation section 5. Screws 511 are fixed at both ends of the rubber disc 51. The sleeves 52 have connecting holes 521 for the screws 511 to pass through. A nut 522 for connecting with the screws 511 is provided inside the sleeves 52. The outer diameter of the nut 522 is larger than the diameter of the connecting hole 521, thereby installing the vibration isolation section 5 between the input system 1 and the steering column 3. A second universal joint 6 is provided between the second output shaft 21 and the bottom end of the steering column 3. The shaft diameters at both ends of the second universal joint 6 are coaxially connected to the steering column 3 and the second output shaft 21, respectively.

[0023] Its working principle is as follows: The input motor drives the first output shaft 11, which in turn drives the first universal joint 4. The two interconnected first universal joints 4 compensate for the installation coaxiality deviation. The vibration isolation part 5 in the middle blocks the vibration of the input motor through the rubber disc 51. The sleeves 52 at both ends of the vibration isolation part 5 are locked by the screw 511 and the nut 522 to ensure that the torque is stably transmitted to the top of the steering column 3. The load motor outputs the corresponding torque to the second output shaft 21 according to the ground load of the simulated steering gear 7. The load is transmitted to the bottom of the steering column 3 through the second universal joint 6 to simulate the real steering resistance and form an anti-force with the input power to drive the steering column 3 to turn. The steering angle sensor 31 collects the steering angle, speed and return status in real time. The electrical signal is transmitted to the control system. Combined with the motor torque and the attenuation effect of the vibration isolation part 5, the steering accuracy and return performance of the steering column 3 are analyzed, taking into account both test accuracy and practicality.

[0024] Example 2 like Figure 1 , Figure 3 , Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that: the first universal joint 4 is set as one, and the rigid connecting parts at both ends of the rubber disc 51 are both set as connecting discs, which are respectively the active transmission disc 53 and the driven transmission disc 54; the active transmission disc 53 is used to connect with the first universal joint 4, and the driven transmission disc 54 is used to connect with the steering column 3. The active transmission disc 53 and the driven transmission disc 54 have the same shape, both of which are composed of a central circular plate 56 and a three-pronged irregular plate 57 fixed on the central circular plate 56, and the three-pronged irregular plate 57 is arranged in a centrally symmetrical structure; at the same time, threads are opened on both the central circular plate 56 and the three-pronged irregular plate 57. Hole 58, drive drive disc 53, driven drive disc 54 and rubber disc 51 are connected by bolts 55 that pass through all three. The function of the bolts 55 is to fix the drive drive disc 53 and driven drive disc 54 to the two ends of the rubber disc 51 respectively. The end of the first universal joint 4 and the drive drive disc 53 are coaxially connected by a flange. The flange is fixedly connected by screws and threaded holes 58 on the center circular plate 56. The steering column 3 and the driven drive disc 54 are also coaxially connected by a flange. The diameter of the three-pronged irregular plate 57 is the same as the diameter of the rubber disc 51. A limiting groove 59 is formed between the three-pronged irregular plate 57 and the center circular plate 56 to limit the position of the bolts 55.

[0025] Its working principle differs from that of Embodiment 1 as follows: the first output shaft 11 drives the only first universal joint 4 to rotate, and the two are coaxially connected through the flange. The torque is transmitted to the rubber disc 51 of the vibration isolation part 5 through the active transmission disc 53 and the through bolt 55. The rubber disc 51 blocks the vibration and transmits the torque to the driven transmission disc 54. The driven transmission disc 54 then drives the steering column 3 to rotate through the flange, and completes the steering in conjunction with the ground load simulated by the load motor.

[0026] Example 3 like Figures 2-5 As shown, the difference between this embodiment and embodiments 1 and 2 is that the test sample is set as a steering assembly consisting of a steering gear 7 and a steering column 3. The load system 2 includes a load seat, a load motor mounted on the load seat, and a swing arm. The swing arm is connected to the tie rod of the steering assembly, and the load motor is used to drive the swing arm to swing.

[0027] Its working principle is as follows: After the input-side power drives the steering assembly to operate, the load motor starts based on the ground load demand of the simulated steering gear 7, and drives the swing arm to swing back and forth on the load seat. The swing arm is connected to the tie rod of the steering assembly, and the swing is converted into a pushing and pulling force on the tie rod, simulating the real resistance transmitted from the ground to the steering gear 7 when the vehicle is driving. This forms a counterforce with the steering power of the steering assembly, prompting the steering assembly to complete the steering action that conforms to the actual working conditions. Data is collected by sensors to achieve performance testing.

[0028] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A vibration isolation device for a steering test bench, comprising an input system, a load system, and a test specimen connected between the input system and the load system, characterized in that: The input system is equipped with an input motor and a first output shaft. The input motor is used to drive the first output shaft to rotate. At least one first universal joint is provided between the first output shaft and the top of the test sample. A vibration isolation part is provided at the first universal joint between the first output shaft and the test sample. The vibration isolation part includes a rubber disc and rigid connectors connected to both ends of the rubber disc. The rigid connectors are used to connect with the first universal joint and the adjacent part thereto.

2. The vibration isolation device for a steering test bench according to claim 1, characterized in that: Two first universal joints are provided, and they are respectively connected to the first output shaft and the steering column; the rigid connecting parts at both ends of the rubber disc are all set as sleeves, and the sleeves at both ends are used to fit with the shaft diameter of the first universal joints at both ends. The rubber disc is fixed with screws at both ends, and the sleeves are provided with connecting holes for the screws to pass through. The sleeves are provided with nuts for connecting with the screws, and the outer diameter of the nuts is larger than the diameter of the connecting holes.

3. The vibration isolation device for the steering test bench according to claim 1, characterized in that: The first universal joint is set as one, and the rigid connecting parts at both ends of the rubber disc are both set as connecting discs. The connecting discs at both ends are the active transmission disc and the driven transmission disc, respectively. The active transmission disc is used to connect with the first universal joint, and the driven transmission disc is used to connect with the steering column.

4. The vibration isolation system for a steering test bench according to any one of claims 2 or 3, characterized in that: The test specimen is set as a steering column, and the load system is equipped with a load motor and a second output shaft. The load motor is used to drive the second output shaft to rotate. A second universal joint is set between the second output shaft and the bottom end of the steering column. The two ends of the second universal joint are connected to the steering column and the second output shaft respectively.

5. The vibration isolation device for a steering test bench according to any one of claims 2 or 3, characterized in that: The test specimen was set as a steering assembly consisting of a steering gear and a steering column. The load system included a load seat, a load motor mounted on the load seat, and a swing arm. The swing arm was connected to the tie rod of the steering assembly, and the load motor was used to drive the swing arm to swing.

6. The vibration isolation apparatus for a steering test bench according to claim 3, characterized by: The active drive plate and the driven drive plate are exactly the same in shape. Both are composed of a central circular plate and a three-pronged irregular plate fixed on the central circular plate. The three-pronged irregular plate is arranged in a centrally symmetrical structure. At the same time, threaded holes are opened on the central circular plate and the three-pronged irregular plate. The active drive plate, the driven drive plate and the rubber disc are connected by bolts that pass through all three. The function of the bolts is to fix the active drive plate and the driven drive plate to the two ends of the rubber disc respectively.

7. The vibration isolation apparatus for a steering test bench according to claim 6, characterized by: The diameter of the triangular shaped plate is the same as the diameter of the rubber disc, and a limiting groove is formed between the triangular shaped plate and the central circular plate to limit the position of the bolt.

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