CN107192561B - Test bed for electric wheel suspension system of hub-driven electric automobile - Google Patents

Abstract

The invention provides a test bench for the electric wheel suspension system of a hub-driven electric vehicle. The suspension device is composed of upper swing arm, horn and lower swing arm. One end of the upper swing arm is connected through the hinge block above the main frame, and the other end is hinged with the horn. The lower end of the horn is connected with one end of the lower swing arm through a ball joint. The other end of the arm is hinged with the fixed block on the main frame, the electric wheel is arranged on the right end of the horn, and the roller device is arranged below the electric wheel through the roller support frame. There is no mechanical transmission mechanism in the overall electric wheel structure, the structure is compact, and the transmission efficiency is high; for the motion test of the electric vehicle under actual operating conditions, the vertical load simulation mechanism can simulate the load, torque and speed of the electric wheel under actual operating conditions The change. The test bench can carry out the electronic differential speed test and brake test of the electric wheel.

Description

A wheel hub drive electric vehicle electric wheel suspension system test bench

technical field

The invention relates to the field of electric vehicles, in particular to a test bench for an electric wheel suspension system of a hub-driven electric vehicle.

Background technique

Energy shortage and environmental pollution in the 21st century are two major problems that need to be solved. In solving these two problems, electric vehicles have irreplaceable advantages. An electric vehicle (BEV) refers to a vehicle that is powered by a vehicle-mounted power supply, drives the wheels with a motor, and meets the requirements of road traffic and safety regulations. Due to its smaller impact on the environment than traditional cars, its prospects are widely optimistic, but the current technology is still immature. However, the current dynamic loading test platform for electric wheels mainly focuses on the performance test of the hub motor in the electric wheel, which cannot fully reflect the performance of the 1/4 body electric wheel system, resulting in insufficient measurement accuracy of the electric wheel. Therefore, a bench test platform for electric wheel suspension system is designed, which has good reference value and application value for the development of pure electric vehicles.

Contents of the invention

Based on the actual requirements for the development and testing of the electric wheel suspension system of the hub-driven electric vehicle, the present invention designs a new electric vehicle electric wheel-suspension vibration detection test platform.

The invention provides a vibration detection test platform for the electric wheel suspension system of a hub-driven electric vehicle. The vertical load loading device applied by the suspension module; a complete electric wheel module is installed on one side of the double wishbone suspension, including horns, brake discs, hub motors, wheel rims and tires; Vibration system, the excitation system includes the frequency conversion motor of the excitation source, and the amplitude adjustment device; the roller device for simulating the road surface is installed on the upper part of the excitation system, and the roller device for simulating the road surface includes a roller shaft, a web, a connecting plate, and a drum skin; the screw transmission is fixed The frame is fixedly connected to the main frame by bolts, and the double-wishbone suspension device is hinged on the frame; the vibration excitation system is fixedly connected to the chassis support by bolts.

The further improvement is that: the vertical load loading device is composed of a crank handle, a screw drive rod, and a screw nut; the crank handle and the screw drive rod are fixedly connected by means of key interference; the screw nut and the screw drive fixing frame are connected through a peripheral The ring bolt is fixed; the screw transmission rod and the screw nut realize the displacement feed in the vertical direction through the meshing of the teeth.

A further improvement is that the structure of the shock absorber is: including a spring and a damper, the spring is compressed in a certain stroke by the upper and lower end covers, and the damper and the upper and lower end covers are fixed by solid connection.

The further improvement is: the suspension module is composed of an upper swing arm, horns, and a lower swing arm; one end of the upper swing arm is connected through a hinge block above the main frame, and the other end of the upper swing arm is hinged with the horns; the lower end of the horns is connected by a ball The head is connected with one end of the lower swing arm, and the other end of the lower swing arm is hinged with the fixed block of the general frame.

The further improvement is that: the road surface simulation device is composed of a drum shaft, a connecting disc, a web, and a drum skin; the drum shaft and the connecting disc are fixed by means of key interference; the connecting disc and the web are fixed by welding. Joint; between the web and the tube skin, the solid connection is realized by welding.

In order to reduce the quality of the structure of the road simulation device, it is necessary to open four round holes on each web as a basis for lightening the weight. The diameter of the round holes is φ15cm according to the finite element analysis results.

The further improvement is: the excitation system is composed of an excitation source variable frequency motor, a coupling, and an amplitude adjustment device; the amplitude adjustment device is composed of an excitation disc, a horizontal tie rod, a vertical push rod, a connecting disc, and bolts and nuts; the excitation source The frequency conversion motor is connected to the fixed base fixture through embedded bolts; one end of the coupling is connected to the shaft of the frequency conversion motor through key interference, and the other end is connected to the amplitude adjustment device through key interference.

The further improvement is: the roller support frame is composed of a longitudinal cylindrical guide post, an upper sleeve, a lower sleeve, and a sleeve transition support sleeve; the longitudinal cylindrical guide post is installed on a fixed base with holes; The hole is installed on the longitudinal cylindrical guide rail, and the side hole for installing the roller shaft is opened on one side of the upper sleeve; the lower sleeve is installed on the longitudinal cylindrical guide rail through the central round hole, and the side hole for fixing the tie rod is opened on one side of the lower sleeve. hole; the transition support sleeve is installed on the longitudinal cylindrical guide rail through the central round hole, the upper end of the transition support sleeve is fixed with the lower end of the upper sleeve by welding, and the lower end of the transition sleeve is fixed with the upper end of the lower sleeve by welding; The other end is fixedly connected by welding and amplitude adjustment device. Thereby realizing the motion coordination of the whole vibration system.

A further improvement is: a pressure sensor is installed between the vertical load loading device and the shock absorber, one end of the pressure sensor and the screw transmission rod are connected firmly by the principle of tooth meshing, and the other end is tightly connected by the bolt and the shock absorber. Cooperate.

A further improvement is that: a displacement sensor is installed at the ball head of the lower swing arm of the double wishbone, and the bottom end of the displacement sensor can be fixed on the lower swing arm with liquid glue.

The beneficial effects of the present invention are: the in-wheel motor and the wheel are integrated, which is suitable for two-wheel or four-wheel independent drive electric vehicles, and there is no mechanical transmission mechanism in the middle of the overall electric wheel structure, which has the advantages of compact structure and high transmission efficiency; In addition to the durability test of electric wheels, it can also be used as a motion test for electric vehicles under actual operating conditions. On this platform, the vertical load simulation mechanism can simulate the changes in load, torque and speed of electric wheels under actual operating conditions. The electronic differential test and braking test of the electric wheel can be carried out; the excitation system can simulate the unevenness of the road surface under different working conditions, and the research and development of electric vehicles can be completed by building a 1/4 electric wheel suspension system test bench. Supporting and reducing capital investment plays a key role in accelerating the introduction of electric vehicles into the market.

Description of drawings

Fig. 1 is a structural front view of the present invention.

Fig. 2 is a left view of the structure of the present invention.

Fig. 3 is a schematic structural view of the vertical loading device of the present invention.

Fig. 4 is a structural schematic diagram of the amplitude adjusting device of the present invention.

Among them: 1- fixed base, 2- total frame, 3- electric wheel, 4- roller device, 5- upper swing arm, 6- horn, 7- lower swing arm, 8- hinge block, 9- fixed block, 10- Roller support frame, 11-longitudinal cylindrical guide column, 12-upper sleeve, 13-lower sleeve, 14-sleeve transition support sleeve, 15-screw drive rod, 16-screw nut, 17-rocking handle, 18- Screw drive fixed frame, 19-excitation source frequency conversion motor, 20-coupling, 21-amplitude adjustment device, 22-brake disc, 23-exciting disc, 24-horizontal tie rod, 25-vertical push rod, 26-connection Disc, 27-shock absorber, 28-pressure sensor.

Detailed ways

In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with examples, which are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

As shown in Figures 1-4, this embodiment provides a test bench for an electric wheel suspension system of a hub-driven electric vehicle, including a fixed base 1 and a main frame 2, the fixed base 1 is arranged at the lower end of the main frame 2, The main frame 2 is provided with a suspension device, an electric wheel 3 and a roller device 4 for simulating the road surface. The suspension device is composed of an upper swing arm 5, a horn 6 and a lower swing arm 7. The upper swing arm One end of 5 is connected by the hinge block 8 above the main frame 2, and the other end is hinged with the croissant 6, and the lower end of the croissant 6 is connected with an end of the lower swing arm 7 through a ball joint, and the other end of the lower swing arm 7 is connected with the total frame. Fixed block 9 on the 2 realizes hinged, and described electric wheel 3 is arranged on the right end of horn 6, and described roller device 4 is arranged on electric wheel 3 below by roller support frame 10.

The roller support frame 10 is composed of a longitudinal cylindrical guide column 11, an upper sleeve 12, a lower sleeve 13 and a sleeve transition support sleeve 14, and the longitudinal cylindrical guide column 11 is installed on the fixed base 1 with holes; The sleeve 12 is installed on the longitudinal cylindrical guide post 11 through the central round hole, and a side hole for installing the roller shaft is opened on one side of the upper sleeve 12; the lower sleeve 13 is installed on the longitudinal cylindrical guide post 11 through the central round hole, and the lower sleeve 13 There is a side hole on one side of the sleeve (13), and the sleeve transition support sleeve 14 is installed on the longitudinal cylindrical guide post 11 through the central round hole. The upper end of the sleeve transition support sleeve 14 is welded to the lower end of the upper sleeve 12. To achieve fixing, the lower end of the sleeve transition support sleeve 14 is fixed with the upper end of the lower sleeve 13 by welding.

The suspension device is provided with a vertical loading device, and the vertical loading device includes a screw drive rod 15, a screw nut 16, a crank handle 17 and a screw drive fixing frame 18, and the rocker handle 17 and the screw drive rod 15 pass through The fixed connection is realized by way of key interference, and the helical nut 16 and the helical transmission fixing frame 18 are fixed by peripheral bolts; the helical transmission rod 15 and the helical nut 16 realize the displacement feed in the vertical direction through tooth meshing.

Below the drum device 4 is provided with an excitation system device for producing different excitation frequencies and amplitudes, the excitation system device includes an excitation source frequency conversion motor 19, a shaft coupling 20 and an amplitude adjustment device 21, and the excitation source frequency conversion The motor 19 is connected to the fixing device of the fixed base 1 through embedded bolts. One end of the coupling 20 is connected to the rotating shaft of the excitation source variable frequency motor 19 through key interference, and the other end is connected to the amplitude adjustment device 21 through key interference. connect.

A brake disc 22 is arranged between the electric wheel 3 and the horn 6, and the speed of the electric wheel 3 is controlled by the brake disc 22.

The amplitude adjusting device 21 is composed of an exciting disc 23, a tie rod 24, a vertical push rod 25 and a connecting disc 26. The tie rod 24 is arranged on the lower sleeve 13, and the vertical push rod 25 is arranged on the tie rod. 24, the excitation disc 23 is set on the front end of the vertical push rod 25, the connecting disc 26 is set on the excitation disc 23, and the tie rod (24) is installed on the side of the lower sleeve (13) on the hole.

A shock absorber 27 is arranged at the lower end of the vertical loading device, and a pressure sensor 28 is arranged between the vertical loading device and the shock absorber 27 .

Claims (4)

1. A test bench for the electric wheel suspension system of a hub-driven electric vehicle, comprising a fixed base (1) and a main frame (2), the fixed base (1) is arranged at the lower end of the main frame (2), and it is characterized in that : The main frame (2) is provided with a suspension device, an electric wheel (3) and a roller device (4) for simulating the road surface, and the suspension device is composed of an upper swing arm (5), horns (6) and the lower swing arm (7), one end of the upper swing arm (5) is connected through the hinge block (8) above the main frame (2), and the other end is hinged with the horn (6), and the horn (6) The lower end of the lower swing arm (7) is connected to one end of the lower swing arm (7) through a ball joint, and the other end of the lower swing arm (7) is hinged to the fixed block (9) on the main frame (2). The electric wheel (3) is set on the horn (6), the roller device (4) is set under the electric wheel (3) through the roller support frame (10); the roller support frame (10) consists of a longitudinal cylindrical guide column (11), an upper sleeve ( 12), the lower sleeve (13) and the sleeve transition support sleeve (14), the longitudinal cylindrical guide post (11) is installed on the fixed base (1) of the hole; the upper sleeve (12) passes through the center The round hole is installed on the longitudinal cylindrical guide post (11), and the upper sleeve (12) has a side hole for installing the roller shaft; the lower sleeve (13) is installed on the longitudinal cylindrical guide post (11) through the central round hole. There are side holes on one side of the upper and lower sleeves (13); the sleeve transition support sleeve (14) is installed on the longitudinal cylindrical guide post (11) through the central round hole, and the upper end of the sleeve transition support sleeve (14) passes through The method of welding is fixed with the lower end of the upper sleeve (12), and the lower end of the sleeve transition support sleeve (14) is fixed with the upper end of the lower sleeve (13) by welding; the suspension device is provided with a vertical loading device , the vertical loading device includes a screw drive rod (15), a screw nut (16), a crank handle (17) and a screw drive fixing frame (18), and the gap between the rocker handle (17) and the screw drive rod (15) The fixed connection is realized by the way of key interference, the helical nut (16) and the helical transmission fixing frame (18) are fixed by peripheral bolts; the helical transmission rod (15) and the helical nut (16) realize the displacement in the vertical direction through tooth meshing. For; the drum device (4) is provided with an excitation system device for generating different excitation frequencies and amplitudes, and the excitation system device includes an excitation source variable frequency motor (19), a coupling (20) and an amplitude adjustment device (21), the excitation source variable frequency motor (19) is connected to the fixed base (1) fixing device through embedded bolts, and one end of the coupling (20) is connected to the excitation source variable frequency motor ( 19) The rotating shaft is connected, and the other end is connected with the amplitude adjustment device (21) through key interference. 2. A wheel-drive electric vehicle electric wheel suspension system test bench according to claim 1, characterized in that: a brake disc (22) is arranged between the electric wheel (3) and the horn (6), and the The brake disc (22) realizes the control of the speed of the electric wheel (3). 3. A wheel-drive electric vehicle electric wheel suspension system test bench according to claim 1, characterized in that: the amplitude adjustment device (21) consists of an exciting disc (23), a tie rod (24), The longitudinal push rod (25) is composed of a connecting disc (26), the tie rod (24) is arranged on the lower sleeve (13), and the longitudinal push rod (25) is arranged in the middle of the tie rod (24). The vibration excitation disk (23) is arranged on the front end of the vertical push rod (25), the connecting disk (26) is arranged on the vibration excitation disk (23), and the tie rod (24) is installed on the lower sleeve (13 ) on the side hole. 4. A wheel-drive electric vehicle electric wheel suspension system test bench according to claim 1, characterized in that: the lower end of the vertical loading device is provided with a shock absorber (27), and the vertical loading device and the shock absorber A pressure sensor (28) is arranged between the devices (27).

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