Suspension structure, dual-wheel steering drive axle and vehicle

Abstract

The present invention belongs to the technical field of automotive suspension devices, and relates to a suspension structure, a dual-wheel steering drive axle and an automobile, including a steering seat for installing a driving motor, an upper thrust plate, a lower thrust plate, an air spring and a torsion rocker arm. The upper end of the air spring is fixed on the vehicle frame, and the lower end of the air spring is fixed on the lower thrust plate. The upper end of the steering seat for installing the driving motor can be rotatably connected to the rear vertical portion of the torsion rocker arm through a rotating component. In the suspension structure of the present application, the air spring is integrated between the upper and lower thrust plates, with a compact structure and space saving, which can greatly save the space occupied by the dual-wheel steering drive axle in the vehicle's internal driving direction (X-axis direction), can meet the layout requirements of large wheelbases of commercial vehicles, and can optimize the interior space of the vehicle. At the same time, the torsion rocker arm is formed by enclosing a "mouth" - shaped structure by a front vertical portion, an upper connecting portion, a rear vertical portion and a lower connecting portion, with a compact structure, space saving and high overall rigidity.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive suspension devices, and relates to a suspension structure, a double-wheel steering drive axle and an automobile. Background Art

[0002] In the existing automotive air suspension structure, the steering axle generally adopts two upper and lower A-shaped swing arms that are symmetric on the left and right sides. The bottom of the "A" shape of the two upper and lower A-shaped swing arms is fixedly connected to a rotating shaft installed on the side of the vehicle frame, and can respectively rotate around a rotating axis close to the longitudinal axis of the vehicle's forward direction. The top of the "A" shape of the two upper and lower A-shaped swing arms is respectively connected to a torsion rocker through a rotating shaft. The outer side of the torsion rocker is assembled with a steering knuckle through a steering pin shaft, and a steering wheel is installed on the steering knuckle, so that while the steering wheel can rotate around the axis of the steering pin shaft, it can swing up and down with the torsion rocker to achieve the functions of buffering, torque transmission and guiding of the suspension mechanism. The existing steering drive axle also adopts a similar suspension structure of two upper and lower A-shaped swing arms and a torsion rocker. The difference is that the wheel center shaft is installed on a drive half shaft with a constant velocity joint.

[0003] However, the existing air suspension structures of automotive steering / drive steering axles that adopt two upper and lower A-shaped swing arms and a torsion rocker that are symmetric on the left and right sides are all arranged between the side of the steering wheel and the vehicle frame, and can only be used for single-wheel steering or steering drive axles, and cannot meet the buffering, torque transmission and guiding functions required by a double-drive steering wheel independent axle. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: aiming at the problem that the existing air suspension structure cannot meet the buffering, torque transmission and guiding functions required by a double-drive steering wheel independent axle, to provide a suspension structure, a double-wheel steering drive axle and an automobile.

[0005] To solve the above technical problem, on the one hand, the present invention provides a suspension structure. The suspension structure includes a drive motor mounting steering seat and a torsion rocker.

[0006] The torsion rocker includes a front vertical portion, a rear vertical portion, an upper connecting portion and a lower connecting portion. The upper connecting portion and the lower connecting portion extend along the front-rear direction of the vehicle. The upper connecting portion is connected between the upper end of the front vertical portion and the upper end of the rear vertical portion, and the lower connecting portion is connected between the lower end of the front vertical portion and the lower end of the rear vertical portion.

[0007] The upper end of the drive motor mounting steering seat is rotatably connected to the front vertical portion of the torsion rocker around a vertical axis.

[0008] Optionally, the suspension structure includes an upper thrust plate, a lower thrust plate and an air spring. The upper thrust plate is disposed above the lower thrust plate, and the air spring is located between the upper thrust plate and the lower thrust plate. The upper end of the air spring is fixed to the vehicle frame, and the lower end of the air spring is fixed to the lower thrust plate. The front ends of the upper thrust plate and the lower thrust plate are hinged to the vehicle frame, and the rear ends of the upper thrust plate and the lower thrust plate are hinged to the rear vertical portion of the torsion rocker arm.

[0009] Optionally, a rotary mounting seat is provided on the front vertical portion. The upper end of the drive motor mounting steering seat is rotatably connected to the rotary mounting seat through a rotary component, and the vertical axis is the axis of the rotary component.

[0010] Optionally, the rotary component includes a steering riser vertically disposed at the upper end of the drive motor mounting steering seat, and a vertical through hole is provided on the rotary mounting seat;

[0011] The suspension structure further includes an upper bearing and a lower bearing. The outer rings of the upper bearing and the lower bearing are press-fitted in the vertical through hole. The steering riser passes through the vertical through hole. The inner ring of the upper bearing is loosely sleeved on the upper end of the steering riser, and the inner ring of the lower bearing is loosely sleeved on the lower end of the steering riser. An upper step surface is provided at the upper end of the vertical through hole, and a lower step surface is provided at the lower end of the vertical through hole. A limiting surface is provided at the lower end of the steering riser;

[0012] The upper end of the steering riser is provided with an external thread, and a locking nut is threadedly connected to the external thread of the steering riser. The locking nut presses against the upper surface of the upper connecting portion to press the upper bearing against the upper step surface, and the lower bearing is pressed between the lower step surface and the limiting surface.

[0013] Optionally, a left rotation limiting block and a right rotation limiting block are provided on the lower surface of the front vertical portion. The left rotation limiting block and the right rotation limiting block are arranged at intervals around the lower opening of the vertical through hole. A rotation limiting block is provided on the upper end surface of the drive motor mounting steering seat; the rotation limiting block can abut against the left rotation limiting block and the right rotation limiting block when the drive motor mounting steering seat rotates.

[0014] Optionally, the front vertical portion, the upper connecting portion, the rear vertical portion and the lower connecting portion enclose a "mouth"-shaped inner cavity.

[0015] Optionally, a plurality of air springs are provided, and the plurality of air springs are arranged at intervals around the front vertical portion.

[0016] Optionally, the upper thrust plate is parallel to the lower thrust plate, the front and rear ends of the upper thrust plate and the lower thrust plate are aligned, and the axis of the air spring is perpendicular to the upper thrust plate and the lower thrust plate;

[0017] The upper thrust plate and the lower thrust plate are in an "A" shape. The upper thrust plate includes an inner side beam of the upper thrust plate, an outer side beam of the upper thrust plate, a long cross beam of the upper thrust plate, and a short cross beam of the upper thrust plate. The long cross beam of the upper thrust plate is connected between the front end of the inner side beam of the upper thrust plate and the front end of the outer side beam of the upper thrust plate. The short cross beam of the upper thrust plate is connected between the rear end of the inner side beam of the upper thrust plate and the rear end of the outer side beam of the upper thrust plate. The inner side beam of the upper thrust plate and the outer side beam of the upper thrust plate are respectively hinged to the vehicle frame through spherical hinge joints. The upper end of the vertical portion of the torsion rocker arm is located between the front end of the inner side beam of the upper thrust plate and the front end of the outer side beam of the upper thrust plate;

[0018] The lower thrust plate includes an inner side beam of the lower thrust plate, an outer side beam of the lower thrust plate, a long cross beam of the lower thrust plate, and a short cross beam of the lower thrust plate. The long cross beam of the lower thrust plate is connected between the front end of the inner side beam of the lower thrust plate and the front end of the outer side beam of the lower thrust plate. The short cross beam of the lower thrust plate is connected between the rear end of the inner side beam of the lower thrust plate and the rear end of the outer side beam of the lower thrust plate. The inner side beam of the lower thrust plate and the outer side beam of the lower thrust plate are respectively hinged to the vehicle frame through spherical hinge joints. The lower end of the vertical portion of the torsion rocker arm is located between the front end of the inner side beam of the lower thrust plate and the front end of the outer side beam of the lower thrust plate.

[0019] Optionally, the suspension structure further includes a shock absorber. The shock absorber is located between the upper thrust plate and the lower thrust plate. The upper end of the shock absorber is fixed to the vehicle frame, and the lower end of the shock absorber is fixed to the lower thrust plate.

[0020] Optionally, the suspension structure further includes a lateral stabilizer bar assembly. The lateral stabilizer bar assembly includes a lateral stabilizer bar, a suspension connection seat, and a vehicle frame connection seat. The suspension connection seat is arranged at the end of the lateral stabilizer bar and is used to fix the end of the lateral stabilizer bar to the middle part of the torsion rocker arm. The vehicle frame connection seat is arranged on the straight section of the lateral stabilizer bar and is used to fix the middle part of the lateral stabilizer bar to the vehicle frame.

[0021] On the other hand, an embodiment of the present invention further provides a double-wheel steering drive axle, which includes an inner wheel, an outer wheel, a first drive motor, a second drive motor, and the above-mentioned suspension structure. The inner wheel and the outer wheel are arranged side by side in the inner and outer directions to form a double wheel. The upper end of the steering seat on which the drive motor is installed passes through the gap between the inner wheel and the outer wheel;

[0022] The first driving motor is installed on the outer side of the lower end of the driving motor mounting steering seat, and the second driving motor is installed on the inner side of the lower end of the driving motor mounting steering seat;

[0023] The first driving motor is used to drive the outer wheel to rotate, and the second driving motor is used to drive the inner wheel to rotate.

[0024] Optionally, the double-wheel steering drive axle further includes a first reduction mechanism and a second reduction mechanism. The first reduction mechanism is connected between the first driving motor and the outer wheel, and the second reduction mechanism is connected between the second driving motor and the inner wheel;

[0025] The first reduction mechanism, the first driving motor, the second driving motor and the second reduction mechanism are arranged in sequence from outside to inside in the space formed by enclosing the outer wheel and the inner wheel.

[0026] Optionally, the grounding points of the double wheels are located behind the vertical axis in the front-rear direction of the vehicle.

[0027] In the suspension structure and the double-wheel steering drive axle provided by the embodiment of the present invention, the upper end of the driving motor mounting steering seat is rotatably connected to the front vertical portion of the torsion rocker arm around a vertical axis. In this way, the vertical axis is arranged between the inner wheel and the outer wheel of the double wheels. Through the steering movement of the driving motor mounting steering seat around the rotation axis (vertical axis) between the double wheels and perpendicular to the ground, the steering function of the double-wheel steering drive axle is realized. In addition, since the vertical axis is arranged between the inner wheel and the outer wheel of the double wheels, the torsion rocker arm rotatably connected to the upper end of the driving motor mounting steering seat can be compactly arranged above the double wheels to obtain greater structural rigidity. The double-wheel steering drive axle has a greater axle load and a greater total transmitted torque. Furthermore, it meets the requirements of buffering, transmitting torque and guiding for the double-wheel steering drive axle.

[0028] In the suspension structure of the present application, a plurality of air springs are integrated between the upper and lower thrust plates, with a compact structure and space saving. It can greatly save the space in the vehicle interior in the driving direction (X-axis direction) occupied by the double-wheel steering drive axle, can meet the layout requirements of large wheelbases for commercial vehicles, and can optimize the interior space of the vehicle. At the same time, the torsion rocker arm is formed by enclosing a "mouth" - shaped inner cavity structure by the front vertical portion, the upper connecting portion, the rear vertical portion and the lower connecting portion, with a compact structure, space saving and high overall rigidity.

[0029] On the other hand, the embodiment of the present invention also provides a vehicle, which includes the above suspension structure or double-wheel steering drive axle. Description of the Drawings

[0030] Figure 1It is a schematic diagram of a suspension structure provided by an embodiment of the present invention;

[0031] Figure 2 It is a top view of the suspension structure provided by an embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of a lateral stabilizer bar assembly of the suspension structure provided by an embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of a torsion rocker arm of the suspension structure provided by an embodiment of the present invention;

[0034] Figure 5 It is a schematic diagram of a steering seat for mounting a drive motor of the suspension structure provided by an embodiment of the present invention;

[0035] Figure 6 It is a schematic diagram of the internal structure of the dual wheels of a dual-wheel steering drive axle provided by the first embodiment of the present invention;

[0036] Figure 7 is Figure 1 The enlarged view at position A in

[0037] The reference numerals in the specification are as follows:

[0038] 1. Steering seat for mounting a drive motor; 11. Rotation limit block; 12. Vertical axis;

[0039] 2. Upper thrust plate; 21. Inner side beam of the upper thrust plate; 22. Outer side beam of the upper thrust plate; 23. Long cross beam of the upper thrust plate; 24. Short cross beam of the upper thrust plate; 3. Lower thrust plate; 4. Air spring;

[0040] 5. Torsion rocker arm; 51. Front vertical part; 52. Rear vertical part; 53. Upper connecting part; 54. Lower connecting part; 55. Left turn limit block; 56. Right turn limit block;

[0041] 6. Steering riser;

[0042] 60. Locking nut; 61. Upper bearing; 62. Lower bearing;

[0043] 7. Lateral stabilizer bar assembly; 71. Lateral stabilizer bar; 72. Suspension connection seat; 73. Frame connection seat; 80. Outer wheel 81. Inner wheel; 82. First drive motor; 83. First reduction mechanism; 84. Second drive motor; 85. Second reduction mechanism; 86. Clutch device;

[0044] 9. Shock absorber. Detailed implementation manners

[0045] In order to make the technical problems, technical solutions, and beneficial effects solved by the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] As Figure 1 shown, the suspension structure provided by the embodiment of the present invention includes a drive motor mounting swivel seat 1 and a torsion rocker arm 5.

[0047] As Figure 4 shown, the torsion rocker arm 5 includes a front vertical portion 51, a rear vertical portion 52, an upper connecting portion 53, and a lower connecting portion 54. The upper connecting portion 53 and the lower connecting portion 54 extend in the front-rear direction of the vehicle. The upper connecting portion 53 is connected between the upper end of the front vertical portion 51 and the upper end of the rear vertical portion 52, and the lower connecting portion 54 is connected between the lower end of the front vertical portion 51 and the lower end of the rear vertical portion 52.

[0048] The upper end of the drive motor mounting swivel seat 1 is rotatably connected to the front vertical portion 51 of the torsion rocker arm 5 about a vertical axis 12.

[0049] In one embodiment, the suspension structure includes an upper thrust plate 2, a lower thrust plate 3, and an air spring 4. The upper thrust plate 2 is disposed above the lower thrust plate 3. The air spring 4 is located between the upper thrust plate 1 and the lower thrust plate 3. The upper end of the air spring 4 is fixed to the vehicle frame, and the lower end of the air spring 4 is fixed to the lower thrust plate 3. The front ends of the upper thrust plate 2 and the lower thrust plate 3 are hinged to the vehicle frame, and the rear ends of the upper thrust plate 2 and the lower thrust plate 3 are hinged to the rear vertical portion of the torsion rocker arm 1.

[0050] In one embodiment, the torsion rocker arm 5 can be made of a cast steel material with an I-shaped cross-section to make it have the characteristics of high rigidity and high strength.

[0051] In one embodiment, the upper end of the rear vertical portion 52 protrudes upward from the upper connecting portion 53.

[0052] In one embodiment, an air spring mounting plate is fixedly provided on the lower thrust plate 3, and the lower end of the air spring 4 is fixed to the air spring mounting plate.

[0053] In one embodiment, the front vertical portion 51 is provided with a rotary mounting seat (not shown in the figure). The upper end of the drive motor mounting swivel seat 1 is rotatably connected to the rotary mounting seat through a rotary component, and the vertical axis 12 is the axis of the rotary component.

[0054] As Figure 5As shown, in one embodiment, the rotating member includes a steering riser 6 vertically disposed at the upper end of the driving motor mounting steering seat 1, and a vertical through hole (not shown in the figure) is provided on the rotating mounting seat.

[0055] The suspension structure further includes an upper bearing 61 and a lower bearing 62. The outer rings of the upper bearing 61 and the lower bearing 62 are press-fitted in the vertical through hole. The steering riser 6 passes through the vertical through hole. The inner ring of the upper bearing 61 is loosely sleeved on the upper end of the steering riser 6, and the inner ring of the lower bearing 62 is loosely sleeved on the lower end of the steering riser 6. An upper step surface is provided at the upper end of the vertical through hole, and a lower step surface is provided at the lower end of the vertical through hole. A limiting surface is provided at the lower end of the steering riser 6.

[0056] The upper end of the steering riser 6 is provided with an external thread, and a locking nut 60 is threadedly connected to the external thread of the steering riser 6. The locking nut 60 presses against the upper surface of the upper connecting portion to press the upper bearing 61 against the upper step surface, and the lower bearing 62 is pressed between the lower step surface and the limiting surface.

[0057] In one embodiment, a left-turn limiting block 55 and a right-turn limiting block 56 are provided on the lower surface of the front vertical portion 51. The left-turn limiting block 55 and the right-turn limiting block 56 are arranged at intervals around the lower opening of the vertical through hole. A rotation-limiting block 11 is provided on the upper end surface of the driving motor mounting steering seat 1. The rotation-limiting block 11 can abut against the left-turn limiting block 55 and the right-turn limiting block 56 when the driving motor mounting steering seat 1 rotates.

[0058] In one embodiment, the front vertical portion 51, the upper connecting portion 53, the rear vertical portion 52, and the lower connecting portion 54 enclose a "mouth"-shaped inner cavity.

[0059] The torsion rocker arm 5 adopts an overall frame force-bearing structure, and its overall rigidity and lateral torsion rigidity are strong;

[0060] In one embodiment, as Figure 2 shown, a plurality of air springs 4 are provided, and the plurality of air springs 4 are arranged at intervals around the front vertical portion 51.

[0061] In one embodiment, the number of air springs 4 is set to 4.

[0062] In one embodiment, the upper thrust plate 2 is parallel to the lower thrust plate 3. The front and rear ends of the upper thrust plate 2 and the lower thrust plate 3 are aligned, and the axis of the air spring 4 is perpendicular to the upper thrust plate 2 and the lower thrust plate 3.

[0063] As Figure 2As shown, the upper thrust plate 2 and the lower thrust plate 3 are in an "A" shape. The upper thrust plate 2 includes an inner side beam 21 of the upper thrust plate, an outer side beam 22 of the upper thrust plate, a long cross beam 23 of the upper thrust plate, and a short cross beam 24 of the upper thrust plate. The long cross beam 23 of the upper thrust plate is connected between the front end of the inner side beam 21 of the upper thrust plate and the front end of the outer side beam 22 of the upper thrust plate. The short cross beam 24 of the upper thrust plate is connected between the rear end of the inner side beam 21 of the upper thrust plate and the rear end of the outer side beam 22 of the upper thrust plate. The inner side beam 21 of the upper thrust plate and the outer side beam 22 of the upper thrust plate are respectively hinged to the vehicle frame through spherical hinge joints. The upper end of the vertical portion of the torsion rocker arm 5 is located between the front end of the inner side beam 21 of the upper thrust plate and the front end of the outer side beam 22 of the upper thrust plate.

[0064] The lower thrust plate 3 includes an inner side beam of the lower thrust plate (not shown in the figure), an outer side beam of the lower thrust plate (not shown in the figure), a long cross beam of the lower thrust plate (not shown in the figure), and a short cross beam of the lower thrust plate (not shown in the figure). The long cross beam of the lower thrust plate is connected between the front end of the inner side beam of the lower thrust plate and the front end of the outer side beam of the lower thrust plate. The short cross beam of the lower thrust plate is connected between the rear end of the inner side beam of the lower thrust plate and the rear end of the outer side beam of the lower thrust plate. The inner side beam of the lower thrust plate and the outer side beam of the lower thrust plate are respectively hinged to the vehicle frame through spherical hinge joints. The lower end of the vertical portion of the torsion rocker arm 5 is located between the front end of the inner side beam of the lower thrust plate and the front end of the outer side beam of the lower thrust plate.

[0065] The connection mode between the upper thrust plate 2 and the lower thrust plate 3 and the vehicle frame adopts spherical hinge connection, so that when the double-wheel steering drive axle of the double-wheel steering drive axle travels on complex road conditions, it can buffer by twisting a certain angle.

[0066] In addition, both the upper thrust plate 2 and the lower thrust plate 3 adopt high-strength steel plate structures, making both of them have high stiffness and strength.

[0067] In one embodiment, the suspension structure further includes a shock absorber 9. The shock absorber 9 is located between the upper thrust plate 2 and the lower thrust plate 3. The upper end of the shock absorber 9 is fixed to the vehicle frame, and the lower end of the shock absorber 9 is fixed to the lower thrust plate 3.

[0068] In one embodiment, as Figure 3 shown, the suspension structure further includes a lateral stabilizer bar assembly 7. The lateral stabilizer bar assembly 7 includes a lateral stabilizer bar 71, a suspension connection seat 72, and a vehicle frame connection seat 73. The suspension connection seat 72 is arranged at the end of the lateral stabilizer bar 71 for fixing the end of the lateral stabilizer bar 71 to the middle of the torsion rocker arm 5. The vehicle frame connection seat 73 is arranged on the straight section of the lateral stabilizer bar 71 for fixing the middle of the lateral stabilizer bar 71 to the vehicle frame.

[0069] In addition, asFigure 6 As shown in the figure, an embodiment of the present invention further provides a double-wheel steering drive axle, which includes an inner wheel 81, an outer wheel 80, a first drive motor 82, a second drive motor 84, and the suspension structure of the above embodiment. The inner wheel 81 and the outer wheel 80 are arranged side by side in the inner and outer directions to form a double-wheel, and the drive motor is installed at the upper end of the steering seat 1 and passes through the gap between the inner wheel 81 and the outer wheel 80.

[0070] The first drive motor 82 is installed on the outer side of the lower end of the drive motor installation steering seat 1, and the second drive motor 84 is installed on the inner side of the lower end of the drive motor installation steering seat 1.

[0071] The first drive motor 82 is used to drive the outer wheel 80 to rotate, and the second drive motor 84 is used to drive the inner wheel 81 to rotate.

[0072] In one embodiment, the double-wheel steering drive axle further includes a first reduction mechanism 83 and a second reduction mechanism 85. The first reduction mechanism 83 is connected between the first drive motor 82 and the outer wheel 80, and the second reduction mechanism 85 is connected between the second drive motor 84 and the inner wheel 81.

[0073] The first reduction mechanism 83, the first drive motor 82, the second drive motor 84, and the second reduction mechanism 85 are arranged in sequence from the outside to the inside in the space formed by the enclosure of the outer wheel 80 and the inner wheel 81.

[0074] In practical applications, the inner wheel 81, the outer wheel 80, the first drive motor 82, the first reduction mechanism 83, the second drive motor 84, the second reduction mechanism 85, and the suspension structure (except the anti-roll bar assembly) are arranged in pairs on the left and right. The inner wheel 81, the outer wheel 80, the first drive motor 82, the first reduction mechanism 83, the second drive motor 84, the second reduction mechanism 85, and the suspension structure of the above embodiment on the left side constitute the left double-wheel steering drive axle, and the inner wheel 81, the outer wheel 80, the first drive motor 82, the first reduction mechanism 83, the second drive motor 84, the second reduction mechanism 85, and the suspension structure on the right side constitute the right double-wheel steering drive axle.

[0075] In one embodiment, both ends of the first drive motor 82 penetrate through the housing of the first drive motor 82, and the outer end of the output shaft of the first drive motor 82 is connected to the input end of the first reduction mechanism 83; both ends of the second drive motor 84 penetrate through the housing of the second drive motor 84, and the inner end of the output shaft of the second drive motor 84 is connected to the input end of the second reduction mechanism 85. A clutch device 86 is provided between the inner end of the output shaft of the first drive motor 82 and the outer end of the output shaft of the second drive motor 84, and the clutch device 86 is used to control the engagement and separation of the output shaft of the first drive motor 82 and the output shaft of the second drive motor 84.

[0076] The second drive motor 84 and the first drive motor 82 are symmetrically arranged on the inner and outer sides of the drive motor mounting steering seat 1, and there are several advantages as follows:

[0077] (1) When the double wheels are in motion, the vibration during the combination of the two motors is eliminated.

[0078] (2) When the double wheels are in motion, the moment of inertia of the two motors is the same, reducing vibration.

[0079] (3) When the double wheels are static, the wheel loads of the outer wheel 80 and the inner wheel 81 are the same, so that the wear of the outer wheel 80 and the inner wheel 81 is uniform.

[0080] (4) When the double wheels are steering, the torque of the two motors themselves is avoided from affecting the steering.

[0081] In one embodiment, the clutch device 86 can be a synchronizer, a clutch or a brake.

[0082] Correspondingly, suspension connection seats 72 are provided at both ends of the lateral stabilizer bar 71. The suspension connection seat 72 at the left end is connected to the torsion arm 5 of the left double-wheel steering drive axle, and the suspension connection seat 72 at the right end is connected to the torsion arm 5 of the right double-wheel steering drive axle. In this way, the suspension structure of the left double-wheel steering drive axle and the suspension structure of the right double-wheel steering drive axle are connected through the lateral stabilizer bar assembly 7.

[0083] When the vehicle is driving under the condition of uneven road surface, the double-wheel steering drive axle will vibrate up and down. The up and down vibration of the "mouth"-shaped torsion arm will drive the rear ends of the A-shaped upper thrust plate 2 and the lower thrust plate 3 to move up and down, so that the air spring 4 installed on the lower thrust plate 3 is compressed or stretched, playing a role in buffering the road surface impact, and the shock absorber 9 installed on the lower thrust plate 3 plays a role in reducing the vibration of the air spring 4.

[0084] When the vehicle is driving on uneven left and right road surfaces or during a turning condition, the wheel heights of the double-wheel steering drive axles on the left and right sides of the vehicle are inconsistent, which will cause the double-wheel steering drive axles to roll laterally and the vehicle body to roll. At this time, the lateral stabilizer bar assembly 7 can be used to enhance the lateral stiffness of the double-wheel steering drive axles and reduce the body roll angle. On the other hand, the "mouth"-shaped torsion rocker arm 5 and the "A"-shaped upper thrust plate 2 and lower thrust plate 3 have good stiffness and strength in all directions, enabling the air suspension to also have a large lateral stiffness and enhancing the vehicle's lateral stiffness.

[0085] In the suspension structure and double-wheel steering drive axle provided by the embodiment of the present invention, the upper end of the drive motor mounting steering seat is rotatably connected to the bent portion of the torsion rocker arm around a vertical axis. In this way, the vertical axis is arranged between the inner wheel and the outer wheel of the double wheels. Through the steering movement of the drive motor mounting steering seat around the rotation axis (vertical axis) between the double wheels and perpendicular to the ground, the steering function of the double-wheel steering drive axle is realized. In addition, since the vertical axis is arranged between the inner wheel and the outer wheel of the double wheels, the torsion rocker arm rotatably connected to the upper end of the drive motor mounting steering seat can be compactly arranged above the double wheels to obtain greater structural rigidity. The double-wheel steering drive axle has a greater axle load and a greater total transmitted torque. Furthermore, it meets the requirements of buffering, transmitting torque, and guiding for the double-wheel steering drive axle.

[0086] In the suspension structure of the present application, multiple air springs are integrated between the upper and lower thrust plates, with a compact structure and space saving. It can greatly save the space in the vehicle interior in the driving direction (X-axis direction) occupied by the double-wheel steering drive axle, meet the layout requirements of large wheelbases for commercial vehicles, and optimize the interior space of the vehicle. At the same time, the torsion rocker arm is formed by enclosing a "mouth"-shaped inner cavity structure by a front vertical portion, an upper connecting portion, a rear vertical portion, and a lower connecting portion, with a compact structure, space saving, and high overall rigidity.

[0087] In one embodiment, the ground contact points of the double wheels are located behind the vertical axis in the front-rear direction of the vehicle.

[0088] In addition, an embodiment of the present invention also provides a vehicle, which includes the suspension structure or double-wheel steering drive axle of the above embodiment.

[0089] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A suspension structure, characterized in that, It includes a drive motor mounting steering seat and a torsion rocker arm; The torsion rocker arm includes a front vertical portion, a rear vertical portion, an upper connecting portion and a lower connecting portion. The upper connecting portion and the lower connecting portion extend in the front-rear direction of the vehicle. The upper connecting portion is connected between the upper end of the front vertical portion and the upper end of the rear vertical portion, and the lower connecting portion is connected between the lower end of the front vertical portion and the lower end of the rear vertical portion; The upper end of the drive motor mounting steering seat is rotatably connected to the front vertical portion of the torsion rocker arm about a vertical axis; The suspension structure includes an upper thrust plate, a lower thrust plate and an air spring. The upper thrust plate is arranged above the lower thrust plate. The air spring is located between the upper thrust plate and the lower thrust plate. The upper end of the air spring is fixed to the vehicle frame, and the lower end of the air spring is fixed to the lower thrust plate. The front ends of the upper thrust plate and the lower thrust plate are hinged to the vehicle frame, and the rear ends of the upper thrust plate and the lower thrust plate are hinged to the rear vertical portion of the torsion rocker arm; A plurality of air springs are provided, and the plurality of air springs are arranged at intervals around the front vertical portion.

2. The suspension structure according to claim 1, characterized in that, A rotary mounting seat is arranged on the front vertical portion, and the upper end of the drive motor mounting steering seat is rotatably connected to the rotary mounting seat through a rotary component, and the vertical axis is the axis of the rotary component.

3. The suspension structure according to claim 2, wherein The rotary component includes a steering riser vertically arranged at the upper end of the drive motor mounting steering seat, and a vertical through hole is arranged on the rotary mounting seat; The suspension structure further includes an upper bearing and a lower bearing. The outer rings of the upper bearing and the lower bearing are interference-fitted in the vertical through hole. The steering riser passes through the vertical through hole. The inner ring of the upper bearing is loosely sleeved on the upper end of the steering riser, and the inner ring of the lower bearing is loosely sleeved on the lower end of the steering riser. An upper step surface is arranged at the upper end of the vertical through hole, and a lower step surface is arranged at the lower end of the vertical through hole. A limiting surface is arranged at the lower end of the steering riser; External threads are arranged at the upper end of the steering riser, and a locking nut is threadedly connected to the external threads of the steering riser. The locking nut presses against the upper surface of the upper connecting portion to press the upper bearing against the upper step surface, and the lower bearing is pressed between the lower step surface and the limiting surface.

4. The suspension structure according to claim 3, characterized in that Left-turn limiting blocks and right-turn limiting blocks are arranged on the lower surface of the front vertical portion. The left-turn limiting blocks and the right-turn limiting blocks are arranged at intervals around the lower opening of the vertical through hole. A rotation-limiting block is arranged on the upper end surface of the drive motor mounting steering seat, and the rotation-limiting block can abut against the left-turn limiting blocks and the right-turn limiting blocks when the drive motor mounting steering seat rotates.

5. The suspension structure according to claim 1, characterized in that, The front vertical portion, the upper connecting portion, the rear vertical portion and the lower connecting portion enclose a "mouth"-shaped inner cavity.

6. The suspension structure according to claim 1, wherein, The upper thrust plate is parallel to the lower thrust plate, the front and rear ends of the upper thrust plate and the lower thrust plate are aligned, and the axis of the air spring is perpendicular to the upper thrust plate and the lower thrust plate; The upper thrust plate and the lower thrust plate are in an "A" shape. The upper thrust plate includes an inner side beam of the upper thrust plate, an outer side beam of the upper thrust plate, a long cross beam of the upper thrust plate, and a short cross beam of the upper thrust plate. The long cross beam of the upper thrust plate is connected between the front end of the inner side beam of the upper thrust plate and the front end of the outer side beam of the upper thrust plate. The short cross beam of the upper thrust plate is connected between the rear end of the inner side beam of the upper thrust plate and the rear end of the outer side beam of the upper thrust plate. The inner side beam of the upper thrust plate and the outer side beam of the upper thrust plate are respectively hinged to the vehicle frame through spherical hinge joints. The upper end of the vertical portion of the torsion rocker arm is located between the front end of the inner side beam of the upper thrust plate and the front end of the outer side beam of the upper thrust plate. The lower thrust plate includes an inner side beam of the lower thrust plate, an outer side beam of the lower thrust plate, a long cross beam of the lower thrust plate, and a short cross beam of the lower thrust plate. The long cross beam of the lower thrust plate is connected between the front end of the inner side beam of the lower thrust plate and the front end of the outer side beam of the lower thrust plate. The short cross beam of the lower thrust plate is connected between the rear end of the inner side beam of the lower thrust plate and the rear end of the outer side beam of the lower thrust plate. The inner side beam of the lower thrust plate and the outer side beam of the lower thrust plate are respectively hinged to the vehicle frame through spherical hinge joints. The lower end of the vertical portion of the torsion rocker arm is located between the front end of the inner side beam of the lower thrust plate and the front end of the outer side beam of the lower thrust plate.

7. The suspension structure according to claim 1, wherein The suspension structure further includes a shock absorber. The shock absorber is located between the upper thrust plate and the lower thrust plate. The upper end of the shock absorber is fixed to the vehicle frame, and the lower end of the shock absorber is fixed to the lower thrust plate.

8. The suspension structure according to claim 1, characterized in that, The suspension structure further includes a lateral stabilizer bar assembly. The lateral stabilizer bar assembly includes a lateral stabilizer bar, a suspension connection seat, and a vehicle frame connection seat. The suspension connection seat is arranged at the end of the lateral stabilizer bar and is used to fix the end of the lateral stabilizer bar to the middle of the torsion rocker arm. The vehicle frame connection seat is arranged on the straight section of the lateral stabilizer bar and is used to fix the middle of the lateral stabilizer bar to the vehicle frame.

9. A double-wheel steering drive axle, characterized in that, It includes an inner wheel, an outer wheel, a first drive motor, a second drive motor, and the suspension structure according to any one of claims 1-8. The inner wheel and the outer wheel are arranged side by side in the inner-outer direction to form a double wheel. The upper end of the drive motor mounting swivel seat passes through the gap between the inner wheel and the outer wheel. The first drive motor is mounted on the outer side of the lower end of the drive motor mounting swivel seat, and the second drive motor is mounted on the inner side of the lower end of the drive motor mounting swivel seat. The first drive motor is used to drive the outer wheel to rotate, and the second drive motor is used to drive the inner wheel to rotate.

10. The double-wheel steering drive axle according to claim 9, wherein, The double-wheel steering drive axle further includes a first reduction mechanism and a second reduction mechanism. The first reduction mechanism is connected between the first drive motor and the outer wheel, and the second reduction mechanism is connected between the second drive motor and the inner wheel. The first reduction mechanism, the first drive motor, the second drive motor, and the second reduction mechanism are arranged in sequence from the outside to the inside in the space formed by the enclosure of the outer wheel and the inner wheel.

11. The double-wheel steering drive axle according to claim 9, characterized in that, The grounding point of the double wheel is located behind the vertical axis in the front-rear direction of the vehicle.

12. An automobile, characterized in that, Including the suspension structure according to any one of claims 1-8 or the double-wheel steering drive axle according to any one of claims 9-11.

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