Suspension structure, dual-wheel steering drive axle and automobile

Abstract

The present invention belongs to the technical field of automobile suspension devices, and relates to a suspension structure, a dual-wheel steering drive axle and an automobile, including a driving motor mounted steering seat, an upper thrust plate, a lower thrust plate, an air spring and a torsion rocker arm, wherein 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 upper end of the driving motor mounted steering seat can be rotatably connected to the bending portion of the torsion rocker arm through a variety of rotating parts. The suspension structure of the present application integrates the air spring between the upper and lower thrust plates, has a compact structure, saves space, can greatly save the space in the driving direction (X-axis direction) of the automobile occupied by the dual-wheel steering drive axle, can meet the layout requirements of large wheelbase commercial vehicles, and can optimize the space inside the vehicle. At the same time, the torsion rocker arm is an L-shaped structure composed of a vertical portion and a bending portion, which has a simple structure and low cost.

Description

Technical Field

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

[0002] The existing automobile air suspension structure generally adopts two upper and lower A-shaped swing arms symmetrical on the left and right sides. The "A"-shaped bottoms of the upper and lower A-shaped swing arms are fixedly connected to the rotating shaft installed on the side of the frame, and can rotate around the rotating axis close to the longitudinal axis of the vehicle's forward direction. The "A"-shaped tops of the upper and lower A-shaped swing arms are each connected to the torsion rocker arm through the rotating shaft. The outer side of the torsion rocker arm is assembled with the steering knuckle through the steering pin shaft, and the steering wheel is installed on the steering knuckle. The steering wheel can rotate around the steering pin shaft axis and can swing up and down with the torsion rocker arm to realize the buffering, torque transmission and guiding functions of the suspension mechanism. The existing steering drive axle also adopts a similar suspension structure of upper and lower A-shaped swing arms and torsion rocker arms, etc. The difference is that the center axis of the wheel is installed on the driving half shaft with a ball cage universal joint.

[0003] However, the existing automobile steering / drive steering axle adopts an air suspension structure with upper and lower A-type swing arms and torsion rocker arms symmetrically arranged on the left and right sides, which can only be used for single-wheel steering or steering drive axles and cannot meet the buffering, torque transmission and guiding functions required by dual-drive steering wheel independent axles. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the problem that the existing air suspension structure cannot meet the buffering, torque transmission and guiding functions required by the dual-drive steering wheel independent bridge, a suspension structure, a dual-wheel steering drive bridge and a car are provided.

[0005] In order to solve the above technical problems, the present invention provides a suspension structure. The suspension structure includes a driving motor mounting steering seat and a torsion rocker arm.

[0006] The torsion rocker arm comprises a vertical portion and a bent portion, wherein the bent portion extends along the front-rear direction of the automobile, and the rear end of the bent portion is connected to the lower end of the vertical portion;

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

[0008] Optionally, the suspension structure also 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 frame, the lower end of the air spring is fixed to the lower thrust plate, the front end of the upper thrust plate and the front end of the lower thrust plate are hinged to the frame, and the rear end of the upper thrust plate and the rear end of the lower thrust plate are hinged to the vertical part of the torsion rocker arm.

[0009] Optionally, the bending portion is provided with a rotating mounting seat, the upper end of the driving motor mounting steering seat is rotatably connected to the rotating mounting seat through a rotating component, and the vertical axis is the axis of the rotating component.

[0010] Optionally, the rotating component includes a king pin, and the rotating mounting seat includes a first mounting plate and a second mounting plate spaced apart from each other, the first mounting plate is provided with a first mounting hole, and the second mounting plate is provided with a second mounting hole coaxial with the first mounting hole;

[0011] The upper end of the driving motor mounting steering seat is provided with a boss extending into the notch between the first mounting plate and the second mounting plate, and the boss is provided with a third mounting hole coaxial with the first mounting hole;

[0012] The suspension structure also includes a first kingpin bushing, a second kingpin bushing and a third kingpin bushing, the outer ring of the first kingpin bushing is interference fitted in the first mounting hole, the outer ring of the second kingpin bushing is interference fitted in the second mounting hole, the outer ring of the third kingpin bushing is interference fitted in the third mounting hole, the kingpin is inserted in the first kingpin bushing, the second kingpin bushing and the third kingpin bushing, and the kingpin is transitionally matched with the inner rings of the first kingpin bushing, the second kingpin bushing and the third kingpin bushing, so that the driving motor mounting steering seat can rotate around the vertical axis.

[0013] Optionally, a left-turn limit block and a right-turn limit block are provided on the front end surface of the bending portion, which are spaced a preset distance apart in the rotation direction of the drive motor mounting steering seat, and a limited rotation block is provided on the boss. When the drive motor mounting steering seat rotates, the limited rotation block can abut against the left-turn limit block and the right-turn limit block to limit the rotation range of the drive motor mounting steering seat.

[0014] Optionally, the rotating component comprises a steering standpipe vertically arranged at the upper end of the driving motor mounting steering seat, and a vertical through hole is arranged on the rotating mounting seat;

[0015] The suspension structure further includes an upper bearing and a lower bearing. The outer ring of the upper bearing is interference-fitted in the vertical through hole. The steering standpipe passes through the vertical through hole.

[0016] The inner ring of the upper bearing is sleeved on the upper end of the steering riser, the inner ring of the lower bearing is sleeved on the lower end of the steering riser, the upper end of the vertical through hole is provided with an upper step surface, the lower end of the vertical through hole is provided with a lower step surface, and the lower end of the steering riser is provided with a limited position surface;

[0017] 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 is pressed on the upper surface of the bent portion to press the upper bearing on the upper step surface, and the lower bearing is pressed between the lower step surface and the limiting surface.

[0018] Optionally, a left-turn limit block and a right-turn limit block are provided on the lower surface of the bending portion, and the left-turn limit block and the right-turn limit block are spaced apart around the lower end opening of the vertical through hole, and a limiting rotation block is provided on the upper end surface of the driving motor mounting steering seat, and the limiting rotation block can abut against the left-turn limit block and the right-turn limit block when the driving motor mounting steering seat rotates.

[0019] 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;

[0020] The upper thrust plate and the lower thrust plate are in an "A" shape, and the upper thrust plate includes an upper thrust plate inner side beam, an upper thrust plate outer side beam, an upper thrust plate long cross beam and an upper thrust plate short cross beam, the upper thrust plate long cross beam is connected between the front end of the upper thrust plate inner side beam and the front end of the upper thrust plate outer side beam, the upper thrust plate short cross beam is connected between the rear end of the upper thrust plate inner side beam and the rear end of the upper thrust plate outer side beam, the upper thrust plate inner side beam and the upper thrust plate outer side beam are respectively hinged to the frame through a spherical hinge joint, and the upper end of the vertical portion of the torsion rocker arm is located between the front end of the upper thrust plate inner side beam and the front end of the upper thrust plate outer side beam;

[0021] 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, and 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 frame through a spherical hinge joint, and 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.

[0022] Optionally, the suspension structure further includes a shock absorber, which is located between the upper thrust plate and the lower thrust plate, the upper end of the shock absorber is fixed to the frame, and the lower end of the shock absorber is fixed to the lower thrust plate.

[0023] Optionally, the suspension structure also includes a stabilizer bar assembly, which includes a stabilizer bar, a suspension connecting seat and a frame connecting seat. The suspension connecting seat is arranged on the end of the stabilizer bar and is used to fix the end of the stabilizer bar to the lower end of the torsion rocker arm. The frame connecting seat is arranged on the straight section of the stabilizer bar and is used to fix the middle part of the stabilizer bar to the frame.

[0024] On the other hand, an embodiment of the present invention further provides a dual-wheel steering drive axle, which includes an inner wheel, an outer wheel, a first reduction mechanism, a second drive motor and the above-mentioned suspension structure, wherein the inner wheel and the outer wheel are arranged side by side in the inner and outer directions to form a dual wheel, and the upper end of the drive motor mounted steering seat passes through the gap between the inner wheel and the outer wheel;

[0025] The first drive motor is installed on the outer side of the lower end of the drive motor mounting steering seat, and the second drive motor is installed on the inner side of the lower end of the drive motor mounting steering seat;

[0026] 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.

[0027] Optionally, the dual-wheel steering drive axle further includes a first reduction mechanism and a second reduction mechanism, wherein 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;

[0028] The first reduction mechanism, the first drive motor, the second drive motor and the second reduction mechanism are arranged in sequence from outside to inside in a space surrounded by the outer wheel and the inner wheel.

[0029] The output shaft of the first drive motor is connected to the input end of the first reduction mechanism, the output end of the first reduction mechanism is connected to the outer wheel, the output shaft of the second drive motor is connected to the input end of the second reduction mechanism, and the output end of the second reduction mechanism is connected to the inner wheel.

[0030] Optionally, the ground contact points of the dual wheels are located behind the vertical axis in the front-rear direction of the vehicle.

[0031] In the suspension structure and the dual-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 bent portion of the torsion rocker arm around a vertical axis. In this way, the vertical axis is set between the inner wheel and the outer wheel of the dual wheels, and the steering function of the dual-wheel steering drive axle is realized by the steering movement of the driving motor mounting steering seat around the rotation axis (vertical axis) between the dual wheels and perpendicular to the ground. In addition, since the vertical axis is set between the inner wheel and the outer wheel of the dual wheels, the torsion rocker arm rotatably connected to the upper end of the driving motor mounting steering seat can be compactly arranged above the dual wheels to obtain greater structural rigidity. The dual-wheel steering drive axle has a larger axle load and a larger total transmission torque. Furthermore, the buffering, torque transmission and guiding functions required by the dual-wheel steering drive axle are met.

[0032] The suspension structure of the present application integrates the air spring between the upper and lower thrust plates, which is compact and space-saving. It can greatly save the space in the driving direction (X-axis direction) of the vehicle occupied by the dual-wheel steering drive axle, meet the layout requirements of commercial vehicles with large wheelbases, and optimize the space inside the vehicle. At the same time, the torsion rocker arm is an L-shaped structure composed of a vertical portion and a bent portion, which is simple in structure and low in cost.

[0033] In addition, the upper end of the steering seat where the driving motor is mounted can be rotatably connected to the bending portion of the torsion rocker arm through a variety of rotating components, and the structural design is highly flexible.

[0034] On the other hand, an embodiment of the present invention further provides a vehicle, which includes the above-mentioned suspension structure or dual-wheel steering drive axle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of a suspension structure provided by a first embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of a suspension structure provided by a second embodiment of the present invention;

[0037] Figure 3 is a top view of a suspension structure provided by an embodiment of the present invention;

[0038] Figure 4 is a schematic diagram of a lateral stabilizer bar assembly of a suspension structure provided by an embodiment of the present invention;

[0039] Figure 5 is a schematic diagram of a torsion rocker arm of a suspension structure provided by a first embodiment of the present invention;

[0040] Figure 6 It is a schematic diagram of a steering seat for mounting a driving motor of a suspension structure provided by a first embodiment of the present invention;

[0041] Figure 7 It is a schematic diagram of a steering seat for mounting a driving motor of a suspension structure provided by a second embodiment of the present invention;

[0042] Figure 8 is a schematic diagram of a torsion rocker arm of a suspension structure provided by a second embodiment of the present invention;

[0043] Fig. 9 It is a schematic diagram of the rotational cooperation between the torsion rocker arm and the driving motor mounting steering seat provided by the second embodiment of the present invention;

[0044] Fig.10 The figure is a schematic diagram of the internal structure of the dual wheels of a dual-wheel steering drive axle provided in one embodiment of the present invention.

[0045] The reference numerals in the specification are as follows:

[0046] 1. Drive motor mounting steering seat; 11. Boss; 12. Rotation limiting block; 13. Vertical axis;

[0047] 2. Upper thrust plate; 21. Inner side beam of upper thrust plate; 22. Outer side beam of upper thrust plate; 23. Long cross beam of upper thrust plate; 24. Short cross beam of upper thrust plate; 3. Lower thrust plate; 4. Air spring;

[0048] 5. Torque rocker arm; 51. Vertical portion; 52. Bending portion; 53. Rotating mounting seat; 54. First mounting plate; 55. Second mounting plate; 56. Left-turn limit block; 57. Right-turn limit block;

[0049] 6. Kingpin;

[0050] 60. Locking nut; 61. Upper bearing; 62. Lower bearing;

[0051] 7. Lateral stabilizer bar assembly; 71. Lateral stabilizer bar; 72. Suspension connecting seat; 73. Frame connecting 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;

[0052] 9. Shock absorber; 10. Steering riser;

[0053] 100, first kingpin bushing; 200, second kingpin bushing; 300, third kingpin bushing. DETAILED DESCRIPTION

[0054] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is 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.

[0055] like Figures 1 to 7 As shown, the suspension structure provided by the embodiment of the present invention includes a driving motor mounting steering seat 1 and a torsion rocker arm 5.

[0056] The torsion rocker arm 5 includes a vertical portion 51 and a bent portion 52 . The bent portion 52 extends along the front-rear direction of the automobile, and the rear end of the bent portion 52 is connected to the lower end of the vertical portion 51 .

[0057] The upper end of the driving motor mounting steering seat 1 is rotatably connected to the bent portion 52 of the torsion rocker arm 5 around a vertical axis 13 .

[0058] In one embodiment, the suspension structure also includes an upper thrust plate 2, a lower thrust plate 3 and an air spring 4, the upper thrust plate 2 is arranged above the lower thrust plate 3, the air spring 4 is located between the upper thrust plate 2 and the lower thrust plate 3, the upper end of the air spring 4 is fixed to the frame, the lower end of the air spring 4 is fixed to the lower thrust plate 3, the front end of the upper thrust plate 2 and the front end of the lower thrust plate 3 are hinged to the frame, and the rear end of the upper thrust plate 2 and the rear end of the lower thrust plate 3 are hinged to the vertical portion 51 of the torsion rocker arm 5.

[0059] In one embodiment, the torsion rocker arm 5 composed of the vertical portion 51 and the bent portion 52 is in an "L" shape, and the vertical portion 51 and the bent portion 52 are approximately vertical. The torsion rocker arm 5 can be made of cast steel material with an I-shaped section to make it have the characteristics of high rigidity and high strength.

[0060] 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 on the air spring mounting plate.

[0061] In one embodiment, the bending portion 52 is provided with a rotating mounting seat 53, and the upper end of the driving motor mounting steering seat 1 is rotatably connected to the rotating mounting seat 53 through a rotating component, and the vertical axis 13 is the axis of the rotating component.

[0062] In one embodiment, if Figure 1 , Figures 5 and 6 As shown, the rotating component includes a kingpin 6, and the rotating mounting seat 53 includes a first mounting plate 54 and a second mounting plate 55 spaced apart from each other. The first mounting plate 54 is provided with a first mounting hole (not shown in the figure), and the second mounting plate 55 is provided with a second mounting hole coaxial with the first mounting hole (not shown in the figure).

[0063] The upper end of the driving motor mounting steering seat 1 is provided with a boss 11 extending into the gap between the first mounting plate 54 and the second mounting plate 55, and the boss 11 is provided with a third mounting hole (not shown in the figure) coaxial with the first mounting hole.

[0064] The suspension structure also includes a first kingpin bushing 100, a second kingpin bushing 200 and a third kingpin bushing 300, the outer ring of the first kingpin bushing 100 is interference fitted in the first mounting hole, the outer ring of the second kingpin bushing 200 is interference fitted in the second mounting hole, and the outer ring of the third kingpin bushing 300 is interference fitted in the third mounting hole, the kingpin 6 is inserted into the first kingpin bushing 100, the second kingpin bushing 200 and the third kingpin bushing 300, and the kingpin 6 is transitionally matched with the inner rings of the first kingpin bushing 100, the second kingpin bushing 200 and the third kingpin bushing 300, so that the drive motor mounting steering seat 1 can rotate around the vertical axis 13.

[0065] In one embodiment, a left-turn limit block 56 and a right-turn limit block 57 are provided on the front end surface of the bending portion 52, which are spaced a preset distance apart in the rotation direction of the drive motor mounting steering seat 1, and a limited rotation block 12 is provided on the boss 11. When the drive motor mounting steering seat 1 rotates, the limited rotation block 12 can abut against the left-turn limit block 56 and the right-turn limit block 57 to limit the rotation range of the drive motor mounting steering seat 1.

[0066] In another embodiment, if Figure 7 As shown, the rotating component includes a steering riser 10 vertically arranged at the upper end of the driving motor mounting steering seat 1, and a vertical through hole (not shown in the figure) is arranged on the rotating mounting seat 53.

[0067] The suspension structure further includes an upper bearing 61 and a lower bearing 62. The outer ring of the upper bearing 61 is interference-fitted in the vertical through hole. The steering stand tube 10 passes through the vertical through hole. The inner ring of the upper bearing 61 is loosely sleeved on the upper end of the steering stand tube 10. The inner ring of the lower bearing 62 is loosely sleeved on the lower end of the steering stand tube 10. The upper end of the vertical through hole is provided with an upper step surface (not shown in the figure), the lower end of the vertical through hole is provided with a lower step surface (not shown in the figure), and the lower end of the steering stand tube 10 is provided with a limited position surface (not shown in the figure).

[0068] The upper end of the steering standpipe 10 is provided with an external thread, and a locking nut 60 is threadedly connected to the external thread of the steering standpipe 10. The locking nut 60 is pressed against the upper surface of the bent portion 52 to press the upper shaft 61 against the upper step surface, and the lower bearing 62 is pressed between the lower step surface and the limit surface.

[0069] In one embodiment, a left turn limit block 56 and a right turn limit block 57 are provided on the lower surface of the bending portion 52, and the left turn limit block 56 and the right turn limit block 57 are spaced around the lower end opening of the vertical through hole, and a limited rotation block 12 is provided on the upper end surface of the driving motor mounting steering seat 1, and the limited rotation block can abut against the left turn limit block and the right turn limit block when the driving motor mounting steering seat rotates.

[0070] 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 .

[0071] like Figure 3 As shown, the upper thrust plate 2 and the lower thrust plate 3 are in an "A" shape, and the upper thrust plate 2 includes an upper thrust plate inner side beam 21, an upper thrust plate outer side beam 22, an upper thrust plate long cross beam 23 and an upper thrust plate short cross beam 24, the upper thrust plate long cross beam 23 is connected between the front end of the upper thrust plate inner side beam 21 and the front end of the upper thrust plate outer side beam 22, the upper thrust plate short cross beam 24 is connected between the rear end of the upper thrust plate inner side beam 21 and the rear end of the upper thrust plate outer side beam 22, the upper thrust plate inner side beam 21 and the upper thrust plate outer side beam 22 are respectively hinged to the frame through a spherical hinge joint (not shown in the figure), and the upper end of the vertical portion 51 of the torsion rocker arm 5 is located between the front end of the upper thrust plate inner side beam 21 and the front end of the upper thrust plate outer side beam 22.

[0072] 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, and 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 frame through a spherical hinge joint, and the lower end of the vertical portion 51 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.

[0073] The upper thrust plate 2 and the lower thrust plate 3 are connected to the vehicle frame in a ball-type hinged manner, so that when the double-wheel steering drive axle is driving on a complex road condition, it can be buffered by twisting at a certain angle.

[0074] In addition, the upper thrust plate 2 and the lower thrust plate 3 are both made of high-strength steel plate structures, so that both have higher rigidity and strength.

[0075] In one embodiment, the suspension structure further includes a shock absorber 9, which 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. Preferably, a shock absorber mounting seat is fixedly provided on the lower thrust plate 3, and the lower end of the shock absorber 9 is fixed to the shock absorber mounting seat.

[0076] In one embodiment, if Figure 4 As shown, the suspension structure also includes a lateral stabilizer bar assembly 7, which includes a lateral stabilizer bar 71, a suspension connecting seat 72 and a frame connecting seat 73. The suspension connecting seat 72 is arranged on the end of the lateral stabilizer bar 71, and is used to fix the end of the lateral stabilizer bar 71 to the lower end of the torsion rocker arm 5. The frame connecting seat 73 is arranged on the straight section of the lateral stabilizer bar 71, and is used to fix the middle part of the lateral stabilizer bar 71 to the frame.

[0077] In addition, if Figure 8 As shown, an embodiment of the present invention further provides a dual-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, wherein the inner wheel 81 and the outer wheel 80 are arranged side by side in the inner and outer directions to form a dual wheel, and the upper end of the drive motor mounting steering seat 1 passes through the gap between the inner wheel 81 and the outer wheel 80.

[0078] The first drive motor 82 is installed on the outer side of the lower end of the drive motor mounting steering seat 1 , and the second drive motor 84 is installed on the inner side of the lower end of the drive motor mounting steering seat 1 .

[0079] The first driving motor 82 is used to drive the outer wheel 80 to rotate, and the second driving motor 84 is used to drive the inner wheel 81 to rotate.

[0080] In one embodiment, the dual-wheel steering drive axle further includes a first reduction mechanism 83 and a second reduction mechanism 85, wherein 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;

[0081] 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 outside to inside in a space surrounded by the outer wheel 80 and the inner wheel 81 .

[0082] In actual application, 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 lateral stabilizer bar assembly) are arranged in pairs on the left and the 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 located on the left side constitute a left-side 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 located on the right side constitute a right-side double-wheel steering drive axle.

[0083] In one embodiment, the two ends of the first drive motor 82 pass 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; the two ends of the second drive motor 84 pass 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 combination and separation of the output shaft of the first drive motor 82 and the output shaft of the second drive motor 84.

[0084] 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, which has the following advantages:

[0085] (1) Eliminate the vibration when the two motors are combined when the two wheels are in motion.

[0086] (2) When the two wheels are in motion, the rotational inertia of the two motors is the same, reducing vibration.

[0087] (3) When both wheels are at rest, the wheel loads of the outer wheel 80 and the inner wheel 81 are the same, so that the outer wheel 80 and the inner wheel 81 wear evenly.

[0088] (4) When steering two wheels, avoid the influence of the torque of the two motors on the steering.

[0089] In one embodiment, the clutch device 86 may be a synchronizer, a clutch or a brake.

[0090] Correspondingly, the suspension connection seat 72 is provided on both ends of the lateral stabilizer bar 71, the suspension connection seat 72 at the left end is connected to the torsion rocker arm 5 of the left dual-wheel steering drive axle, and the suspension connection seat 72 at the right end is connected to the torsion rocker arm 5 of the right dual-wheel steering drive axle. In this way, the suspension structure of the left dual-wheel steering drive axle is connected to the suspension structure of the right dual-wheel steering drive axle through the lateral stabilizer bar assembly 7.

[0091] When the car is driving on an uneven road, the dual-wheel steering drive axle will vibrate up and down. The up and down vibration of the "L"-shaped torsion rocker arm will drive the rear ends of the A-shaped upper thrust plate 2 and 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, which plays a role in buffering the impact of the road surface. The shock absorber 9 installed on the lower thrust plate 3 plays a role in reducing the vibration of the air spring 4.

[0092] When the car is driving on the uneven left and right roads or in the turning condition, the wheel heights of the left and right dual-wheel steering drive axles of the whole vehicle are inconsistent, which will cause the dual-wheel steering drive axles to roll laterally and the whole vehicle body to roll. At this time, the lateral stabilizer bar assembly 7 can be used to enhance the lateral stiffness of the dual-wheel steering drive axle and reduce the body roll angle. On the other hand, the "L"-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, so that the air suspension also has a large lateral stiffness, which can enhance the lateral stiffness of the whole vehicle.

[0093] In one embodiment, the ground contact point of the inner wheel 81 and the ground contact point of the outer wheel 80 are located behind the vertical axis 13 in the front-rear direction of the vehicle.

[0094] In the suspension structure and the dual-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 bent portion of the torsion rocker arm around a vertical axis. In this way, the vertical axis is set between the inner wheel and the outer wheel of the dual wheels, and the steering function of the dual-wheel steering drive axle is realized by the steering movement of the driving motor mounting steering seat around the rotation axis (vertical axis) between the dual wheels and perpendicular to the ground. In addition, since the vertical axis is set between the inner wheel and the outer wheel of the dual wheels, the torsion rocker arm rotatably connected to the upper end of the driving motor mounting steering seat can be compactly arranged above the dual wheels to obtain greater structural rigidity. The dual-wheel steering drive axle has a larger axle load and a larger total transmission torque. Furthermore, the buffering, torque transmission and guiding functions required by the dual-wheel steering drive axle are met.

[0095] The suspension structure of the present application integrates the air spring between the upper and lower thrust plates, which is compact and space-saving. It can greatly save the space in the driving direction (X-axis direction) of the vehicle occupied by the dual-wheel steering drive axle, meet the layout requirements of commercial vehicles with large wheelbases, and optimize the space inside the vehicle. At the same time, the torsion rocker arm is an L-shaped structure composed of a vertical portion and a bent portion, which is simple in structure and low in cost.

[0096] In addition, the upper end of the steering seat where the driving motor is mounted can be rotatably connected to the bending portion of the torsion rocker arm through a variety of rotating components, and the structural design is highly flexible.

[0097] In addition, an embodiment of the present invention further provides a car, which includes the suspension structure or the dual-wheel steering drive axle of the above embodiment.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A suspension structure, characterized in that: It includes a driving motor mounted steering seat and a torque rocker arm; The torsion rocker arm comprises a vertical portion and a bent portion, wherein the bent portion extends along the front-rear direction of the automobile, and the rear end of the bent portion is connected to the lower end of the vertical portion; The upper end of the driving motor mounting steering seat is rotatably connected to the bending portion of the torsion rocker arm around a vertical axis; The outer side of the lower end of the driving motor mounting steering seat is used to mount the first driving motor, and the inner side of the lower end of the driving motor mounting steering seat is used to mount the second driving motor; The suspension structure also includes an upper thrust plate and a lower thrust plate, wherein the upper thrust plate is arranged above the lower thrust plate, the front end of the upper thrust plate and the front end of the lower thrust plate are hinged on the frame, and the rear end of the upper thrust plate and the rear end of the lower thrust plate are hinged on the vertical part of the torsion rocker arm.

2. The suspension structure according to claim 1, characterized in that: The suspension structure further includes an air spring, which 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.

3. The suspension structure according to claim 1, characterized in that: The bending portion is provided with a rotating mounting seat, and the upper end of the driving motor mounting steering seat is rotatably connected to the rotating mounting seat through a rotating component, and the vertical axis is the axis of the rotating component.

4. The suspension structure according to claim 3, characterized in that: The rotating component includes a king pin, and the rotating mounting seat includes a first mounting plate and a second mounting plate spaced apart from each other, the first mounting plate is provided with a first mounting hole, and the second mounting plate is provided with a second mounting hole coaxial with the first mounting hole; The upper end of the driving motor mounting steering seat is provided with a boss extending into the notch between the first mounting plate and the second mounting plate, and the boss is provided with a third mounting hole coaxial with the first mounting hole; The suspension structure also includes a first kingpin bushing, a second kingpin bushing and a third kingpin bushing, the outer ring of the first kingpin bushing is interference fitted in the first mounting hole, the outer ring of the second kingpin bushing is interference fitted in the second mounting hole, and the outer ring of the third kingpin bushing is interference fitted in the third mounting hole, the kingpin is inserted in the first kingpin bushing, the second kingpin bushing and the third kingpin bushing, and the kingpin is transitionally matched with the inner rings of the first kingpin bushing, the second kingpin bushing and the third kingpin bushing, so that the driving motor mounting steering seat can rotate around the vertical axis.

5. The suspension structure according to claim 4, characterized in that: A left-turn limit block and a right-turn limit block are arranged on the front end surface of the bending portion, which are spaced a preset distance apart in the rotation direction of the driving motor mounting steering seat, and a limited rotation block is arranged on the boss. When the driving motor mounting steering seat rotates, the limited rotation block can abut against the left-turn limit block and the right-turn limit block to limit the rotation range of the driving motor mounting steering seat.

6. The suspension structure according to claim 3, characterized in that: The rotating component comprises a steering standpipe vertically arranged at the upper end of the driving motor mounting steering seat, and the rotating mounting seat is provided with a vertical through hole; The suspension structure further comprises an upper bearing and a lower bearing, the outer ring of the upper bearing is interference-fitted in the vertical through hole, the steering stand pipe passes through the vertical through hole, the inner ring of the upper bearing is loosely sleeved on the upper end of the steering stand pipe, the inner ring of the lower bearing is loosely sleeved on the lower end of the steering stand pipe, the upper end of the vertical through hole is provided with an upper step surface, the lower end of the vertical through hole is provided with a lower step surface, and the lower end of the steering stand pipe is provided with a limited position surface; 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 is pressed on the upper surface of the bent portion to press the upper bearing on the upper step surface, and the lower bearing is pressed between the lower step surface and the limiting surface.

7. The suspension structure according to claim 6, characterized in that: A left-turn limit block and a right-turn limit block are arranged on the lower surface of the bending portion, and the left-turn limit block and the right-turn limit block are arranged at intervals around the lower end opening of the vertical through hole. A limited rotation block is arranged on the upper end surface of the driving motor mounting steering seat, and the limited rotation block can abut against the left-turn limit block and the right-turn limit block when the driving motor mounting steering seat rotates.

8. The suspension structure according to claim 2, characterized in that: 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, and the upper thrust plate includes an upper thrust plate inner side beam, an upper thrust plate outer side beam, an upper thrust plate long cross beam and an upper thrust plate short cross beam, the upper thrust plate long cross beam is connected between the front end of the upper thrust plate inner side beam and the front end of the upper thrust plate outer side beam, the upper thrust plate short cross beam is connected between the rear end of the upper thrust plate inner side beam and the rear end of the upper thrust plate outer side beam, the upper thrust plate inner side beam and the upper thrust plate outer side beam are respectively hinged to the frame through a spherical hinge joint, and the upper end of the vertical portion of the torsion rocker arm is located between the front end of the upper thrust plate inner side beam and the front end of the upper thrust plate outer side beam; 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, and 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 frame through a spherical hinge joint, and 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.

9. The suspension structure according to claim 2, characterized in that: The suspension structure further includes a shock absorber, which is located between the upper thrust plate and the lower thrust plate, wherein 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.

10. The suspension structure according to claim 1, characterized in that: The suspension structure also includes a lateral stabilizer bar assembly, which includes a lateral stabilizer bar, a suspension connecting seat and a frame connecting seat. The suspension connecting seat is arranged on the end of the lateral stabilizer bar and is used to fix the end of the lateral stabilizer bar to the lower end of the torsion rocker arm. The frame connecting 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 frame.

11. A dual-wheel steering drive axle, characterized in that: The invention comprises an inner wheel, an outer wheel, a first drive motor, a second drive motor and a suspension structure according to any one of claims 1 to 10, wherein the inner wheel and the outer wheel are arranged side by side in the inner and outer directions to form a double wheel, and the upper end of the steering seat on which the drive motor is mounted passes through the gap between the inner wheel and the outer wheel; The first drive motor is installed on the outer side of the lower end of the drive motor mounting steering seat, and the second drive motor is installed on the inner side of the lower end of the drive motor mounting steering seat; 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.

12. The dual-wheel steering drive axle according to claim 11, characterized in that: The dual-wheel steering drive axle further includes a first reduction mechanism and a second reduction mechanism, wherein 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 outside to inside in a space surrounded by the outer wheel and the inner wheel.

13. The dual-wheel steering drive axle according to claim 11, characterized in that: The ground contact points of the dual wheels are located behind the vertical axis in the front-rear direction of the vehicle.

14. A car, characterized in that: It comprises the suspension structure described in any one of claims 1 to 10 or the dual-wheel steering drive axle described in any one of claims 11 to 13.

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