Automobile steering and road simulation loading device

Abstract

The invention discloses an automobile steering and road simulation loading device, and belongs to the technical field of whole automobile simulation testing. The device is mainly composed of five parts. Wherein the power transmission unit transmits the power of an automobile to the power dynamometer; the steering torque loading unit and the steering torque generating unit are in transmission with a gear through a steering torque loading motor, and accurate torque is transmitted to an automobile steering wheel, so that a real steering working condition is simulated; the road bumping simulation unit simulates a real road bumping environment through reciprocating motion of an oil cylinder; the protection unit is used for protecting internal mechanisms and fixing the whole automobile steering and road simulation loading device. According to the invention, the problems that the test precision is influenced and the tested vehicle steering angle is limited because the rotation radius of the existing vehicle steering simulation device is too large are effectively solved, and the real-time performance and the accuracy are improved at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of complete vehicle simulation testing, and in particular to an automobile steering and road simulation loading device. Background Art

[0002] As a critical subsystem of the car, the steering device greatly affects the vehicle's driving safety, handling stability, and driving comfort. In the development process of modern cars, the loading test of the car's steering device is a key link in the in-loop testing of the whole vehicle.

[0003] The current equipment on the market has the following technical defects: 1. The center of rotation cannot be adjusted. The rotation radius of the car steering simulation device is too large, which affects the test accuracy and limits the steering angle of the test vehicle; 2. Single function. The existing steering test bench and road simulation device are mostly independent systems, which cannot achieve the combined loading of steering torque and road bumps; 3. Insufficient dynamic response. Traditional mechanical transmission structures (such as turbines and worm gears) have response lags, making it difficult to accurately simulate the transient torque changes of the steering system; 4. Spatial layout restrictions. The connection rigidity between the modules of the equipment is too strong, which makes multi-degree-of-freedom adjustment difficult and cannot adapt to test models with different wheelbases and wheelbases; 5. Measurement accuracy defects. The sensor layout of the existing device is unreasonable and easily affected by mechanical vibration, resulting in distortion of torque and displacement signal acquisition. Summary of the invention

[0004] In view of the above problems, it is urgent to develop an integrated, high-precision automobile steering and road composite working condition simulation device that can simultaneously realize: dynamic loading and real-time feedback control of steering torque, accurate reproduction of multi-axial road excitation, rapid adaptation and spatial position adjustment of equipment modules, and multi-physical field synchronous acquisition and analysis of test data. The present invention provides an automobile steering and road simulation loading device, which is mainly composed of five parts: a power transmission unit, a steering torque loading unit, a steering torque generating unit, a road bump simulation unit and a protection unit.

[0005] Furthermore, the power transmission unit is composed of a coaxially arranged brake disc connection device, a universal transmission half shaft and a connection dynamometer flange. One end of the brake disc connection device is connected to the brake disc of the vehicle under test, and the other end is connected to the connection dynamometer flange through the universal transmission half shaft to achieve power transmission with the external dynamometer.

[0006] Furthermore, the steering torque loading unit includes a hub-like bracket, a rotation center adjustment slider, a rotation center adjustment motor and a movable support seat. The hub-like bracket contacts the outer cylindrical surface of the brake disc connection device through a deep groove ball bearing with a double-row angular contact structure, and the outer retaining ring and the inner retaining ring of the bearing are provided with a stepped sealing groove, and the outer retaining ring of the bearing is equipped with a preload adjustment bolt, which is axially fixed to the brake disc connection device through the outer retaining ring and the inner retaining ring of the bearing. The rotation center adjustment slider is slidably matched with the imitation wheel hub bracket through a dovetail structure. The upper part of the rotation center adjustment slider is provided with a through hole, which can be fastened to the threaded hole on the side of the imitation wheel hub bracket with bolts to lock the current position; the middle part of the rotation center adjustment slider is provided with a threaded hole, which is connected to the rotation center adjustment motor through a screw mechanism, and the rotation center adjustment motor drives the screw mechanism to achieve position adjustment and is locked by bolts; the L-shaped mounting plate on the rotation center adjustment motor is fixed to the threaded hole at the bottom of the imitation wheel hub bracket by bolts; an internal threaded pin is passed through the through hole of the rotation center adjustment slider and the through hole at the upper end of the movable support seat, and the two ends of the internal threaded pin are fixed by bolts and washers, so that the movable support seat can swing relative to the imitation wheel hub bracket; a load-bearing ball universal wheel is provided at the bottom of the movable support seat, which can swing freely on the plane of the load-bearing base to improve the adjustment flexibility.

[0007] Furthermore, the steering torque generating unit is composed of a bearing base, a gear mounting base, a support column, a slewing gear, a torque sensor, a cross-axis universal joint, a steering torque loading motor and an inner shield. The upper end of the cross-axis universal joint passes through the through hole in the center of the bearing base and is fixed to the movable support base, and the lower end is coaxially connected to the slewing gear by bolts through the torque sensor. The slewing gear is fixed to the gear mounting base by bearing matching. A support column is provided between the bearing base and the gear mounting base, which is fixed by bolts; a slewing gear is provided on the gear mounting base, which is fixed to the gear mounting base by bearing matching; a torque sensor is installed on the inner plane of the slewing gear, which is coaxially connected to the movable support base by bolts through the cross-axis universal joint; a detachable motor mounting plate is provided on the support column, and the steering torque loading motor is fixed to the motor mounting plate by bolts, and meshes with the slewing gear through the pinion to drive the slewing gear to generate steering torque, which is monitored in real time by the torque sensor.

[0008] Furthermore, the road bump simulation unit includes a cylindrical vertical guide rail, a vertical loading cylinder, a cylinder mounting base, a limit fixing seat and a guide rail wear-resistant bushing. The upper end of the vertical loading cylinder is fixed to the gear mounting base by bolts, and the lower end is fixed to the cylinder mounting base by bolts. The lower part of the cylindrical vertical guide rail is fixed to the cylinder mounting base by a quick-release locking optical axis fixing seat, and passes through the guide rail wear-resistant bushing on the gear mounting base. When the vertical loading cylinder is working, the gear mounting base can be lifted and lowered relative to the cylinder mounting base to simulate the bumpy road load. A ground ball universal wheel is provided at the bottom of the cylinder mounting base to facilitate overall movement.

[0009] Furthermore, the protection unit includes an inner shield, an outer shield and a limit fixing seat, the inner shield is fixed to the bearing base by bolts, the outer shield is fixed to the limit fixing seat by bolts, and the limit fixing seat is fixed to the laboratory floor or iron floor. The outer shield of the protection unit is provided with a plurality of bull's eye balls, so that the inner shield can slide up and down relative to the outer shield; the outer shield is provided with two spring handles for easy assembly and movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the automobile steering and road simulation loading device of the present invention;

[0011] Figure 2 It is a cross-sectional schematic diagram of the automobile steering and road simulation loading device of the present invention;

[0012] Figure 3 It is a schematic diagram of the appearance of the automobile steering and road simulation loading device of the present invention;

[0013] Figure 4 A schematic diagram of a vehicle test of the vehicle steering and road simulation loading device of the present invention;

[0014] The numbers in the figure are: 1. Brake disc connection device; 2. Universal transmission half shaft; 3. Dynamometer connection flange; 4. Imitation wheel hub bracket; 5. Deep groove ball bearing; 6. Bearing outer retaining ring; 7. Bearing inner retaining ring; 8. Rotation center adjustment motor; 9. Rotation center adjustment slider; 10. Movable support frame; 11. Bearing ball universal wheel; 12. Bearing base; 13. Support column; 14. Cross-axis universal joint; 15. Torque sensor; 16. Steering torque loading motor; 1 7. Gear mounting base; 18. Rotating gear; 19. Motor mounting plate; 20. Guide rail wear-resistant bushing; 21. Vertical loading cylinder; 22. Cylindrical vertical guide rail; 23. Optical axis fixing seat; 24. Cylinder mounting base; 25. Limit fixing seat; 26. Ground ball universal wheel; 27. Inner guard; 28. Outer guard; 29. ​​Bull's eye ball; 30. Spring handle; 31. Steering and road simulation loading device; 32. Power dynamometer; 33. Vehicle under test. DETAILED DESCRIPTION

[0015] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0016] Embodiment 1:

[0017] See attached Figure 4For front-wheel drive or four-wheel drive vehicles, the front wheels are responsible for both driving and steering. Therefore, the steering and road simulation loading device only needs to be installed at the front wheel position, and the rear wheels only simulate road bumps or increase power testing. A set of steering and road simulation loading devices 31 and a power dynamometer 32 are installed on both sides of the front wheels of the tested vehicle 33. Since the steering and road simulation loading device 31 is an independent set and is easy to move and install, it can be adapted to vehicles of different vehicle widths.

[0018] Embodiment 2:

[0019] See attached Figure 1 , the steering and road simulation loading device includes a power transmission unit, a steering torque loading unit, a steering torque generating unit, a road bump simulation unit and a protection unit; the steering torque loading unit mainly performs real-time steering load loading on the entire mechanism; the power loading simulation device performs load loading on the steering wheel of the tested vehicle; the road bump simulation unit is used to support the entire steering and road simulation loading device. When the vehicle is driving on a real road surface, the loading torque of the ground on the steering wheel is different under different vehicle speeds and different steering angles. Since the steering wheel is installed on the vehicle brake disc, the driving and steering actions are also transmitted to the steering wheel by the brake disc, so it is determined that the brake disc can replace the steering wheel for vehicle testing. From the above, it can be seen that one end of the universal transmission half shaft 2 in the power transmission unit is connected to the external power dynamometer by connecting the dynamometer flange 3, and the other end is connected to the brake disc connecting device 1 by bolts, and the brake disc connecting device 1 is bolted to the brake disc of the tested vehicle. When the steering wheel of the vehicle under test needs to simulate rotation, steering and bumpy conditions at the same time, first, the brake disc of the vehicle under test enters the driving mode. At this time, the external power dynamometer provides a power load which is transmitted to the brake disc connecting device 1 through the universal transmission half shaft 2, and then transmitted to the brake disc of the vehicle under test; secondly, the road bump simulation unit starts to run, and the vertical loading cylinder 21 drives the regular lifting and lowering movement generated by the mechanism above it, which is transmitted to the brake disc of the vehicle under test by the brake disc connecting device 1; finally, the steering wheel of the vehicle under test performs a steering action. At this time, the steering torque loading motor 16 outputs the corresponding steering load, which is amplified by the rotating gear 18 and then transmitted to the brake disc of the vehicle under test through the cross-axis universal joint 14, the movable support seat 10, the rotating center slider 9, the imitation wheel hub bracket 4 until the brake disc connecting device 1.

[0020] The universal transmission half shaft 2 ensures that the vehicle brake disc performs steering action while simulating rotation and bumpy conditions; the cross-axis universal joint 14 ensures that the steering torque loading unit and the steering torque generating unit rotate synchronously, and the angle information is read by the incremental encoder. The upper computer calculates the steering load according to the preset environment, and the steering load is output by the steering torque loading motor 7.

[0021] The specific settings are based on actual construction requirements and are not specifically limited in this application.

[0022] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A vehicle steering and road simulation loading device, characterized in that: It includes a power transmission unit, a steering torque loading unit, a steering torque generating unit, a road bump simulation unit and a protection unit; The power transmission unit comprises a coaxially arranged brake disc connection device (1), a universal transmission half shaft (2) and a connection dynamometer flange (3), wherein one end of the brake disc connection device (1) is connected to the brake disc of the vehicle under test, and the other end is connected to the connection dynamometer flange (3) through the universal transmission half shaft (2), and the connection dynamometer flange (3) is connected to an external dynamometer; The steering torque loading unit comprises a wheel hub bracket (4), a rotation center adjustment slider (9), a rotation center adjustment motor (8), and a movable support seat (10), wherein the wheel hub bracket (4) contacts the outer cylindrical surface of the brake disc connection device (1) via a deep groove ball bearing (5), and is axially fixed via a bearing outer retaining ring (6) and a bearing inner retaining ring (7); The steering torque generating unit comprises a bearing base (12), a gear mounting base (17), a supporting column (13), a slewing gear (18), a torque sensor (15), a cross-axis universal joint (14), a steering torque loading motor (16), and an inner shield (27), wherein the upper end of the cross-axis universal joint (14) passes through a through hole in the center of the bearing base (12) and is fixed to the movable support base (10), and the lower end is coaxially connected to the torque sensor (15) and the slewing gear (18), and the slewing gear (18) is fixed to the gear mounting base (17); The road bump simulation unit comprises a cylindrical vertical guide rail (22), a vertical loading cylinder (21), a cylinder mounting base (24), and a limit fixing base (25), wherein two ends of the vertical loading cylinder (21) are respectively fixed to the gear mounting base (17) and the cylinder mounting base (24); The protection unit comprises an inner protective cover (27), an outer protective cover (28), and a position-limiting fixing seat (25), wherein the inner protective cover (27) is fixed on the bearing base (12), the outer protective cover (28) is fixed on the position-limiting fixing seat (25), and the position-limiting fixing seat (25) is fixed on the laboratory floor or the iron floor.

2. The vehicle steering and road simulation loading device according to claim 1, characterized in that: The rotation center adjustment slider (9) of the steering torque loading unit has a dovetail structure in the middle that is slidably matched with the imitation wheel hub bracket (4); the rotation center adjustment slider (9) has a through hole on the upper part and a threaded hole on the side of the imitation wheel hub bracket (4) that is fastened by a fastener to lock the current position; the rotation center adjustment slider (9) has a threaded hole in the middle part that is transmission-connected to the rotation center adjustment motor (8) through a screw mechanism; the rotation center adjustment motor (8) has an L-shaped mounting plate that is fixed to the imitation wheel hub bracket (4); the rotation center adjustment slider (9) has a through hole at the lower end and an internal threaded pin passes through the through hole at the upper end of the movable support seat (10), and the two ends of the internal threaded pin are fixed by fasteners so that the movable support seat (10) can swing relative to the imitation wheel hub bracket (4); the movable support seat (10) has a plurality of load-bearing ball universal wheels (11) at the bottom, which are in direct contact with the inner plane of the load-bearing base (12).

3. The vehicle steering and road simulation loading device according to claim 1, characterized in that: A support column (13) is provided between the bearing base (12) and the gear mounting base (17) of the steering torque generating unit; a rotating gear (18) is provided on the gear mounting base (17) and is fixed to the gear mounting base (17); a torque sensor (15) is installed on the inner plane of the rotating gear (18) and is coaxially connected to the movable support base (10) via a cross-axis universal joint (14); a detachable motor mounting plate (19) is provided on the support column (13), and a steering torque loading motor (16) is fixed on the motor mounting plate (19); and a pinion is provided on the steering torque loading motor (16) and is meshed with the rotating gear (18).

4. The vehicle steering and road simulation loading device according to claim 1, characterized in that: The upper end of the vertical loading cylinder (21) of the road bump simulation unit is fixed to the gear mounting base (17), and the lower end is fixed to the cylinder mounting base (24); the optical axis fixing seat (23) below the cylindrical vertical guide rail (22) is fixed to the cylinder mounting base (24); there are multiple cylindrical vertical guide rails (22), which pass through the guide rail wear-resistant bushing (20) on the gear mounting base (17); and the bottom of the cylinder mounting base (24) is provided with a ground ball universal wheel (26).

5. The vehicle steering and road simulation loading device according to claim 1, characterized in that: The outer shield (28) of the protection unit is provided with a plurality of bull's eye balls (29), which can enable the inner shield (27) to slide up and down relative to the outer shield (28); and the outer shield (28) is provided with two spring handles (30).

6. The vehicle steering and road simulation loading device according to claim 1, characterized in that: The deep groove ball bearing of the wheel hub bracket (4) adopts a double-row angular contact structure, the bearing outer retaining ring (6) and the bearing inner retaining ring (7) are provided with stepped sealing grooves, and the bearing outer retaining ring is equipped with a preload adjustment bolt.

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