Front independent suspension system for heavy truck and heavy truck

Abstract

The invention belongs to the technical field of vehicle suspensions, and particularly relates to a front independent suspension system for a heavy truck and the heavy truck. The front independent suspension system for the heavy truck comprises a frame assembly, a steering mechanism and a steering gear, the steering mechanism is of an asymmetric structure and comprises a rocker arm, a longitudinal pull rod, a swing arm assembly, a left steering unit and a right steering unit, the left steering unit comprises a left steering knuckle arm and a left steering transverse pull rod, and the right steering unit comprises a right steering knuckle arm and a right steering transverse pull rod. The left steering tie rod and the right steering tie rod are both connected with the swing arm assembly, the length of the left steering knuckle arm is not equal to the length of the right steering knuckle arm, and the length of the left steering tie rod is not equal to the length of the right steering tie rod. The heavy truck adopts the front independent suspension system for the heavy truck, so that the use cost of parts is saved while the comfort and the maneuverability of the whole truck are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle suspension, and in particular relates to a front independent suspension system for a heavy truck and a heavy truck. Background Art

[0002] The front suspension of heavy trucks widely adopts a multi-leaf spring non-independent suspension structure, which has become the mainstream choice on the market due to its simple structure and low cost. However, due to the mutual influence between the wheels on both sides, the large friction between the steel leaf spring leaves, and the large unsprung mass, the handling stability and smoothness of heavy trucks are poor.

[0003] The double wishbone independent suspension structure has high load capacity, high stability and excellent suspension adjustment performance, which makes the vehicle have better driving stability and handling. It has been gradually applied to heavy trucks. The existing double wishbone independent suspension system is a double wishbone independent suspension system and a vehicle disclosed in the Chinese invention patent application with application publication number CN116729035A. The double wishbone independent suspension system includes a frame assembly and two sets of linkage steering mechanisms arranged between the wheels and the frame assembly. The steering mechanism includes a steering knuckle, a shock absorber assembly, an upper control arm assembly, a lower control arm assembly and a gear rack steering gear assembly. The upper control arm assembly is connected to the upper part of the shock absorber assembly and the steering knuckle, the lower control arm assembly is connected to the frame assembly and the steering knuckle, and the lower part of the shock absorber assembly is connected to the lower control arm assembly. The above double wishbone independent suspension system can improve the comfort and handling stability of the vehicle.

[0004] The existing double wishbone independent suspension system is also an independent suspension system and commercial vehicle disclosed in the Chinese invention patent application with application publication number CN117818268A. The independent suspension system includes a subframe, two symmetrically arranged guide assemblies, a shock absorber, an elastic member and a steering assembly. Each guide assembly includes a first control arm, a second control arm and an intermediate arm. The steering assembly includes a steering gear, a swing unit and a linkage unit. The swing unit connects the steering gear and the linkage unit. The linkage unit is symmetrically arranged in two groups, which are respectively connected to the swing unit and the wheel side assembly. The above independent suspension system can also improve the comfort and handling stability of the vehicle.

[0005] It can be seen from the above disclosure that most existing independent suspension systems adopt a symmetrical steering structure. Although they can maintain the comfort and handling stability of the vehicle, they use more parts, have high usage costs, and still occupy a large lateral space of the vehicle. Summary of the invention

[0006] The invention provides a front independent suspension system for a heavy truck and a heavy truck, so as to solve the technical problems that the independent suspension system of existing vehicles uses many parts, has high cost of parts and occupies a large lateral space of the vehicle.

[0007] In order to solve the above problems, the front independent suspension system for heavy trucks provided by the present invention adopts the following technical solutions: A front independent suspension system for a heavy truck includes a frame assembly, a steering mechanism and a steering gear. The steering mechanism adopts an asymmetric structure and includes a rocker arm, a longitudinal tie rod, a swing arm assembly, a left steering unit and a right steering unit. The left steering unit includes a left steering knuckle arm and a left steering tie rod. One end of the left steering tie rod is connected to the swing arm assembly, and the other end is connected to the left steering knuckle arm. The other end of the left steering knuckle arm is used to connect to the left wheel side assembly. The right steering unit includes a right steering knuckle arm and a right steering tie rod. One end of the right steering tie rod is connected to the swing arm assembly, and the other end is connected to the right steering knuckle arm. The other end of the right steering knuckle arm is used to connect to the right wheel side assembly; the end of the longitudinal tie rod away from the rocker arm is connected to the swing arm assembly; the length of the left steering knuckle arm is not equal to the length of the right steering knuckle arm, and the length of the left steering tie rod is not equal to the length of the right steering tie rod. Furthermore, the swing arm assembly includes a swing arm, a swing arm spindle, and an angular contact ball bearing connected between the swing arm and the swing arm spindle; the swing arm is provided with connecting holes respectively connected to the left steering tie rod, the right steering tie rod and the longitudinal tie rod, and is also provided with a mounting hole for installing the swing arm spindle, and a limit assembly for limiting the axial displacement of the angular contact ball bearing is provided in the mounting hole.

[0008] Furthermore, the limiting assembly includes an elastic retaining ring for the hole, a swing arm washer, a round nut and a stop washer for the round nut. A retaining ring groove is provided on the upper side of the inner end of the mounting hole, and a step surface is provided on the lower side. The elastic retaining ring for the hole and the swing arm washer are respectively located on the upper and lower sides of the angular contact ball bearing, and the elastic retaining ring for the hole is arranged at the retaining ring groove, and the stop washer for the round nut is clamped between the swing arm spindle and the round nut, and the round nut is arranged at the step surface.

[0009] Furthermore, the steering gear, rocker arm, longitudinal tie rod and swing arm are all located on the same side of the chassis.

[0010] Furthermore, the steering gear is a recirculating ball steering gear, which is arranged vertically, with the output end of the steering gear extending along the Y-axis direction, the input end extending along the Z-axis direction, and the longitudinal pull rod extending along the X-axis direction. The X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other.

[0011] Furthermore, the frame assembly includes a frame, an underframe, a front connecting bracket, a rear connecting bracket, and a control arm bracket, a shock absorber bracket and a coil spring bracket that are symmetrically arranged and connected on both sides of the frame, the frame is located above the underframe, the front connecting bracket and the rear connecting bracket are both connected to the frame and the underframe; the shock absorber bracket is connected to the shock absorber, the control arm bracket is equipped with an upper control arm and a lower control arm, a steering knuckle bracket is connected between the upper control arm and the lower control arm, a steering knuckle is equipped on the steering knuckle bracket, a coil spring assembly is installed on the coil spring bracket, and the shock absorber and the coil spring assembly are both connected to the steering knuckle bracket.

[0012] Furthermore, the upper control arm is U-shaped, the lower control arm is A-shaped, and the middle portion of the U-shaped upper control arm and the top portion of the A-shaped lower control arm are respectively connected to the steering knuckle.

[0013] Furthermore, the coil spring assembly is located on the inner side of the upper control arm, and includes a coil spring, a coil spring pad, a buffer block and a buffer block bracket. The coil spring is arranged between the coil spring bracket and the steering knuckle bracket, the coil spring pad is arranged at both ends of the coil spring, the buffer block bracket is located in the coil spring and the bottom end is connected to the steering knuckle bracket, and the buffer block is located in the coil spring and arranged on the top of the buffer block bracket.

[0014] Furthermore, a triangular limiting boss is provided on the steering knuckle bracket, the limiting boss and the shock absorber are located on the same side of the steering knuckle bracket, and a limiting screw for stopping and cooperating with the limiting boss is provided on the steering knuckle.

[0015] The beneficial effects of the front independent suspension system for heavy trucks of the present invention are as follows: the present invention still adopts a double wishbone independent suspension structure, and while meeting the conditions of high load capacity, high stability and excellent suspension adjustment performance, reduces the double swing arm assembly in the prior art to a single rocker arm assembly, thereby reducing the use of parts, and reducing the cost of parts while improving the performance of the entire vehicle; in addition, by adopting a swing arm assembly, compared with the prior art, an installation space for a swing arm assembly is reserved, saving the lateral installation space of the vehicle, which is beneficial to the installation and arrangement of other parts of the vehicle.

[0016] The technical solution of the heavy truck provided by the present invention is: A heavy truck, comprising a front independent suspension system for a heavy truck, the front independent suspension system for a heavy truck comprising a frame assembly, a steering mechanism and a steering gear, the steering mechanism adopts an asymmetric structure, comprising a rocker arm, a longitudinal tie rod, a swing arm assembly, a left steering unit and a right steering unit; the left steering unit comprises a left steering knuckle arm and a left steering tie rod, one end of the left steering tie rod is connected to the swing arm assembly, and the other end is connected to the left steering knuckle arm, and the other end of the left steering knuckle arm is used to connect to the left wheel side assembly; The right steering unit includes a right steering knuckle arm and a right steering tie rod. One end of the right steering tie rod is connected to the swing arm assembly, and the other end is connected to the right steering knuckle arm. The other end of the right steering knuckle arm is used to connect to the right wheel side assembly; the end of the longitudinal tie rod away from the rocker arm is connected to the swing arm assembly; the length of the left steering knuckle arm is not equal to the length of the right steering knuckle arm, and the length of the left steering tie rod is not equal to the length of the right steering tie rod. Furthermore, the swing arm assembly includes a swing arm, a swing arm spindle, and an angular contact ball bearing connected between the swing arm and the swing arm spindle; the swing arm is provided with connecting holes respectively connected to the left steering tie rod, the right steering tie rod and the longitudinal tie rod, and is also provided with a mounting hole for installing the swing arm spindle, and a limit assembly for limiting the axial displacement of the angular contact ball bearing is provided in the mounting hole.

[0017] Furthermore, the limiting assembly includes an elastic retaining ring for the hole, a swing arm washer, a round nut and a stop washer for the round nut. A retaining ring groove is provided on the upper side of the inner end of the mounting hole, and a step surface is provided on the lower side. The elastic retaining ring for the hole and the swing arm washer are respectively located on the upper and lower sides of the angular contact ball bearing, and the elastic retaining ring for the hole is arranged at the retaining ring groove, and the stop washer for the round nut is clamped between the swing arm spindle and the round nut, and the round nut is arranged at the step surface.

[0018] Furthermore, the steering gear, rocker arm, longitudinal tie rod and swing arm are all located on the same side of the chassis.

[0019] Furthermore, the steering gear is a recirculating ball steering gear, which is arranged vertically, with the output end of the steering gear extending along the Y-axis direction, the input end extending along the Z-axis direction, and the longitudinal pull rod extending along the X-axis direction. The X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other.

[0020] Furthermore, the frame assembly includes a frame, an underframe, a front connecting bracket, a rear connecting bracket, and a control arm bracket, a shock absorber bracket and a coil spring bracket that are symmetrically arranged and connected on both sides of the frame, the frame is located above the underframe, the front connecting bracket and the rear connecting bracket are both connected to the frame and the underframe; the shock absorber bracket is connected to the shock absorber, the control arm bracket is equipped with an upper control arm and a lower control arm, a steering knuckle bracket is connected between the upper control arm and the lower control arm, a steering knuckle is equipped on the steering knuckle bracket, a coil spring assembly is installed on the coil spring bracket, and the shock absorber and the coil spring assembly are both connected to the steering knuckle bracket.

[0021] Furthermore, the upper control arm is U-shaped, the lower control arm is A-shaped, and the middle portion of the U-shaped upper control arm and the top portion of the A-shaped lower control arm are respectively connected to the steering knuckle.

[0022] Furthermore, the coil spring assembly is located on the inner side of the upper control arm, and includes a coil spring, a coil spring pad, a buffer block and a buffer block bracket. The coil spring is arranged between the coil spring bracket and the steering knuckle bracket, the coil spring pad is arranged at both ends of the coil spring, the buffer block bracket is located in the coil spring and the bottom end is connected to the steering knuckle bracket, and the buffer block is located in the coil spring and arranged on the top of the buffer block bracket.

[0023] Furthermore, a triangular limiting boss is provided on the steering knuckle bracket, the limiting boss and the shock absorber are located on the same side of the steering knuckle bracket, and a limiting screw for stopping and cooperating with the limiting boss is provided on the steering knuckle.

[0024] Beneficial effects of the heavy-duty truck of the present invention: The heavy-duty truck of the present invention has good vibration reduction performance, high vehicle handling and comfort. In addition, an asymmetric steering mechanism is adopted, which improves the overall performance of the vehicle while reducing the use cost of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a top view schematic diagram of a front independent suspension system for a heavy truck provided by the present invention; Figure 2 It is a rear view schematic diagram of a front independent suspension system for a heavy truck provided by the present invention; Figure 3 It is a three-dimensional structural schematic diagram of a front independent suspension system for a heavy truck provided by the present invention; Figure 4 It is a structural schematic diagram of a steering mechanism of a front independent suspension system for a heavy truck provided by the present invention; Figure 5 for Figure 4 An exploded diagram of the middle swing arm assembly; Figure 6 for Figure 4 A cross-sectional view of the middle swing arm assembly; Figure 7 is a cross-sectional view of the connection between the coil spring assembly, the steering knuckle bracket and the coil spring bracket in the present invention; Figure 8 It is a structural schematic diagram of the installation position of the shock absorber in the present invention; Fig. 9 It is a schematic diagram of the assembly structure between the steering knuckle bracket and the wheel side assembly in the present invention.

[0026] Description of reference numerals: 1. Frame assembly; 2. Steering mechanism; 3. Shock absorber; 4. Steering gear; 5. Drum brake; 6. Frame; 7. Underframe; 8. Front connecting bracket; 9. Rear connecting bracket; 10. Control arm bracket; 11. Shock absorber bracket; 12. Coil spring bracket; 13. Coil spring assembly; 14. Steering knuckle bracket; 15. Steering knuckle; 16. Upper control arm; 17. Lower control arm; 18. Left steering knuckle arm; 19. Left steering tie rod; 20. Right steering tie rod; 21. Right steering knuckle arm; 22. Swing arm; 23. Trailing rod; 24. Rocker arm; 25 , coil spring pad; 26, coil spring; 27, buffer block; 28, buffer block bracket; 29, steering gear bracket; 30, shock absorber washer; 31, round nut; 32, swing arm spindle; 33, angular contact ball bearing; 34, elastic retaining ring for hole; 35, swing arm washer; 36, stop washer for round nut; 37, mounting hole; 38, connecting hole; 39, upper control arm connecting part; 40, lower control arm connecting part; 41, shock absorber connecting part; 42, coil spring assembly connecting part; 43, steering knuckle connecting part; 44, limiting boss; 45, limiting screw. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0029] Embodiments of the front independent suspension system for heavy trucks provided by the present invention: like Figure 1 As shown, the front independent suspension system for heavy trucks includes a frame assembly 1, a steering mechanism 2, a steering gear 4, a shock absorber 3, a coil spring assembly 13 and a wheel rim assembly.

[0030] Among them, Figure 1 and Figure 3As shown, the design of the frame assembly 1 improves the handling and comfort of the vehicle by reducing the direct transmission of vibration and noise. At the same time, it can effectively share the force and load of the suspension, and improve the life and reliability of various parts of the suspension. Specifically, the frame assembly 1 includes a frame 6, a chassis 7, a front connecting bracket 8, a rear connecting bracket 9, a control arm bracket 10, a shock absorber bracket 11 and a coil spring bracket 12. The frame 6 is located above the chassis 7, and the front connecting bracket 8 and the rear connecting bracket 9 are arranged at intervals in the length direction of the vehicle. The bottoms of the front connecting bracket 8 and the rear connecting bracket 9 are respectively connected to the front and rear ends of the chassis 7, and the tops are respectively connected and fixed to the frame 6 by bolts and nuts.

[0031] like Figure 1 and Figure 2 As shown, the control arm bracket 10, the shock absorber bracket 11 and the coil spring bracket 12 are each provided with two groups, and are symmetrically arranged on the left and right sides of the frame 6 and the bottom frame 7. The control arm bracket 10 on each side includes two upper control arm brackets and two lower control arm brackets. The two upper control arm brackets are connected to the frame 6 and arranged in a front-to-back interval. The two lower control arm brackets are connected to the bottom frame 7 and arranged in a front-to-back interval. The two upper control arm brackets are connected to an upper control arm 16, and the two lower control arm brackets are connected to a lower control arm 17. A steering knuckle bracket 14 is connected between the upper control arm 16 and the lower control arm 17. The lower control arm 17, the upper control arm 16, and the steering knuckle bracket 14 are made of isothermally quenched ductile iron. The upper control arm 16 is a U-shaped structure, and the lower control arm 17 is an A-shaped structure, which improves the stability and life of the parts. A rubber ball joint and an elastic retaining ring for a hole are arranged at the front and rear inner points of the lower control arm 17, and an interference fit is adopted. A step surface and a retaining ring groove are arranged at the front and rear inner points of the lower control arm 17, so as to limit the axial displacement of the rubber ball joint.

[0032] like Fig. 9 As shown, the steering knuckle bracket 14 has an upper control arm connection portion 39, a lower control arm connection portion 40, a shock absorber connection portion 41, a coil spring assembly connection portion 42 and a steering knuckle connection portion 43. The upper control arm connection portion 39 is connected to the middle portion of the U-shaped upper control arm 16, and the lower control arm connection portion 40 is connected to the top position of the A-shaped lower control arm 17, where the top position of the lower control arm 17 refers to the end of the lower control arm 17 away from the chassis.

[0033] like Figure 8 As shown, the upper end of the shock absorber 3 is connected to the shock absorber bracket 11, and the lower end is connected to the shock absorber connecting portion 41. The center line direction of the installation position of the shock absorber 3 is at an angle a with the longitudinal direction of the frame 6, and there are two shock absorber washers 30 between the lower end surface of the shock absorber 3 and the steering knuckle bracket 14. The shock absorber 3 is a prior art and will not be described in detail here. Figure 2As shown, there are two wheel rim assemblies with the same structure, namely the left wheel rim assembly and the right wheel rim assembly. Both wheel rim assemblies include a drum brake 5 and a steering knuckle 15 connected together. The steering knuckle 15 is arranged at the steering knuckle connection part 43 and is rotatably assembled with the steering knuckle bracket 14 through a physical kingpin. Fig. 9 As shown, the steering knuckle bracket 14 is also provided with a triangular limiting boss 44 , the limiting boss 44 and the shock absorber 3 are located on the same side of the steering knuckle bracket 14 , and the steering knuckle 15 is provided with a limiting screw 45 for engaging with the limiting boss 44 .

[0034] like Figure 7 and Fig. 9 As shown, the connecting portion 42 of the coil spring assembly is in the shape of a disk, and a disk corresponding thereto is provided on the coil spring bracket 12. The coil spring assembly 13 is located as a whole in the U-shaped opening of the upper control arm 16, and includes a coil spring 26, a coil spring pad 25, a buffer block 27, and a buffer block bracket 28. The coil spring 26 is arranged between the coil spring bracket 12 and the steering knuckle bracket 14, and the coil spring pad 25 is arranged at both ends of the coil spring 26, respectively close to the connecting portion 42 of the coil spring assembly and the disk of the steering knuckle bracket 14; the buffer block bracket 28 is located in the coil spring 26 and the bottom end is connected to the steering knuckle bracket 14, and the buffer block 27 is located in the coil spring 26 and arranged on the top of the buffer block bracket 28.

[0035] The steering mechanism 2 adopts an asymmetric structure, including a rocker arm 24, a longitudinal tie rod 23, a swing arm assembly, a left steering unit and a right steering unit. The steering gear 4 is a recirculating ball steering gear, which is arranged vertically. The output end of the steering gear 4 extends along the Y axis direction, the input end extends along the Z axis direction, and the longitudinal tie rod 23 extends along the X axis direction. The X axis direction, the Y axis direction and the Z axis direction are perpendicular to each other. The steering gear 4 is fixed to the frame 6 by a steering gear bracket 29. One end of the steering gear bracket 29 is connected to the steering gear 4 by bolts, and the other end is connected to the frame 6 by bolts. Of course, in other embodiments, the steering gear 4 can also match different types of steering gears according to the specific vehicle model, such as a rack and pinion steering gear, a worm crank pin steering gear, etc.

[0036] The rocker arm 24 has a sickle-shaped appearance. The upper end of the rocker arm 24 is connected to the output end of the steering gear 4 through a ball head. The end of the longitudinal tie rod 23 close to the steering gear 4 is connected to the lower end of the rocker arm 24 through a ball head.

[0037] In this embodiment, the swing arm assembly connects the left steering unit, the right steering unit and the longitudinal tie rod 23. Figure 5 and Figure 6As shown, the swing arm assembly includes a swing arm 22, a swing arm spindle 32, an angular contact ball bearing 33 connected between the swing arm 22 and the swing arm spindle 32, a hole elastic ring 34, a swing arm washer 35, a round nut 31 and a stop washer 36 for the round nut. A mounting hole 37 and three connecting holes 38 are provided on the swing arm 22. The diameter of the mounting hole 37 is larger than the diameters of the three connecting holes 38. Each connecting hole 38 is provided with a tapered hole at the end. A retaining ring groove is provided on the upper side of the inner end of the mounting hole 37, and a step surface is provided on the lower side. The swing arm spindle 32 is arranged in the mounting hole 37, and the upper and lower ends are both connected to the base frame 7 by bolts. The hole elastic ring 34 and the swing arm washer 35 are both sleeved outside the swing arm spindle 32 and are respectively located on the upper and lower sides of the angular contact ball bearing 33, and the hole elastic ring 34 is provided at the retaining ring groove. Two angular contact ball bearings 33 are provided, which are installed face to face and are provided with sealing rings. The angular contact ball bearings 33 can rotate circumferentially around the swing arm spindle 32 to realize the rotation of the entire swing arm assembly relative to the chassis 7. The round nut stop washer 36 is clamped between the swing arm spindle 32 and the round nut 31, and the round nut 31 is set on the step surface. It can be seen from the above installation relationship that the hole elastic ring 34, the swing arm washer 35, the round nut 31 and the round nut stop washer 36 together constitute a limit assembly, which can limit the axial displacement of the angular contact ball bearing 33.

[0038] like Figure 4 As shown, the left steering unit includes a left steering knuckle arm 18 and a left steering tie rod 19. The left steering tie rod 19 extends along the Y-axis direction. The end of the left steering tie rod 19 away from the left wheel side assembly is connected to the swing arm 22 through a ball head, and the end close to the left wheel side assembly is connected to the left steering knuckle arm 18 through a ball head; the end of the left steering knuckle arm 18 away from the left steering tie rod 19 is connected to the steering knuckle 15 of the left wheel side assembly.

[0039] like Figure 4 As shown, the right steering unit includes a right steering knuckle arm 21 and a right steering tie rod 20. The end of the right steering tie rod 20 away from the right wheel side is connected to the swing arm 22 through a ball head, and the end close to the right wheel side assembly is connected to the right steering knuckle arm 21 through a ball head; the end of the right steering knuckle arm 21 away from the right steering tie rod 20 is connected to the steering knuckle 15 of the right wheel side assembly. The connection positions of the right steering tie rod 20, the left steering tie rod 19 and the longitudinal tie rod 23 with the swing arm 22 are all at the connection hole 38 set on the swing arm 22.

[0040] like Figure 1 and Figure 4As shown, the swing arm assembly and the steering gear 4 are both located on the left side of the chassis 7, which also makes the arm length of the left steering knuckle arm 18 smaller than the arm length of the right steering knuckle arm 21, and the rod length of the left steering tie rod 19 smaller than the rod length of the right steering tie rod 20. Of course, in other embodiments, the positions of the steering gear 4 and the swing arm assembly can be reasonably set according to the specific vehicle model, not limited to the arm length of the left steering knuckle arm 18 being smaller than the arm length of the right steering knuckle arm 21, and the rod length of the left steering tie rod 19 being smaller than the rod length of the right steering tie rod 20 in the present application, or the arm length of the left steering knuckle arm 18 being larger than the arm length of the right steering knuckle arm 21, and the rod length of the left steering tie rod 19 being larger than the rod length of the right steering tie rod 20. According to the spatial layout on the vehicle chassis, reasonable settings can be made to ensure that the length of the left steering tie rod 19 is not equal to the length of the right steering tie rod 20, and the arm length of the left steering knuckle arm 18 is not equal to the arm length of the right steering knuckle arm 21.

[0041] The present invention still adopts a double wishbone independent suspension structure, and while meeting the conditions of high load capacity, high stability and excellent suspension adjustment performance, reduces the double swing arm assembly in the prior art to a single rocker arm assembly, thereby reducing the use of parts, improving the performance of the entire vehicle while reducing the cost of parts; in addition, by adopting a swing arm assembly, compared with the prior art, an installation space for a swing arm assembly is reserved, saving the vehicle's lateral installation space, which is beneficial to the installation and arrangement of other parts of the vehicle.

[0042] Embodiment of the heavy truck of the present invention: The heavy truck includes a front independent suspension system for a heavy truck. The structure of the front independent suspension system for a heavy truck is the same as the structure described in the above embodiment of the front independent suspension system for a heavy truck, and will not be described in detail here.

[0043] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "X-axis direction", "Y-axis direction", "Z-axis direction", "top", "bottom", "inside", "outside", etc., which indicate orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A front independent suspension system for a heavy truck, comprising a frame assembly, a steering mechanism and a steering gear, It is characterized in that The steering mechanism adopts an asymmetric structure, including a rocker arm, a longitudinal tie rod, a swing arm assembly, a left steering unit and a right steering unit; The left steering unit includes a left steering knuckle arm and a left steering tie rod, one end of the left steering tie rod is connected to the swing arm assembly, and the other end is connected to the left steering knuckle arm, and the other end of the left steering knuckle arm is used to connect to the left wheel side assembly; The right steering unit comprises a right steering knuckle arm and a right steering tie rod, one end of the right steering tie rod is connected to the swing arm assembly, and the other end is connected to the right steering knuckle arm, and the other end of the right steering knuckle arm is used to connect to the right wheel side assembly; the end of the longitudinal tie rod away from the rocker arm is connected to the swing arm assembly; The length of the left steering knuckle arm is not equal to the length of the right steering knuckle arm, and the length of the left steering tie rod is not equal to the length of the right steering tie rod.

2. A front independent suspension system for a heavy truck according to claim 1, It is characterized in that The swing arm assembly includes a swing arm, a swing arm spindle, and an angular contact ball bearing connected between the swing arm and the swing arm spindle; the swing arm is provided with connecting holes respectively connected to the left steering tie rod, the right steering tie rod and the longitudinal tie rod, and is also provided with a mounting hole for installing the swing arm spindle, and a limit assembly for limiting the axial displacement of the angular contact ball bearing is provided in the mounting hole.

3. A front independent suspension system for a heavy truck according to claim 2, It is characterized in that The limiting assembly includes an elastic retaining ring for a hole, a swing arm washer, a round nut and a stop washer for the round nut. A retaining ring groove is provided on the upper side of the inner end of the mounting hole, and a step surface is provided on the lower side. The elastic retaining ring for the hole and the swing arm washer are respectively located on the upper and lower sides of the angular contact ball bearing, and the elastic retaining ring for the hole is arranged at the retaining ring groove. The stop washer for the round nut is clamped between the swing arm spindle and the round nut, and the round nut is arranged at the step surface.

4. A front independent suspension system for a heavy truck according to any one of claims 1 to 3, It is characterized in that The steering gear, rocker arm, longitudinal tie rod and swing arm are all located on the same side of the chassis.

5. A front independent suspension system for a heavy truck according to any one of claims 1 to 3, It is characterized in that The steering gear is a recirculating ball steering gear, which is arranged vertically. The output end of the steering gear extends along the Y-axis direction, the input end extends along the Z-axis direction, and the longitudinal pull rod extends along the X-axis direction. The X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other.

6. A front independent suspension system for a heavy truck according to any one of claims 1 to 3, It is characterized in that The frame assembly includes a frame, an underframe, a front connecting bracket, a rear connecting bracket, and a control arm bracket, a shock absorber bracket and a coil spring bracket which are symmetrically arranged and connected to both sides of the frame. The frame is located above the underframe, and the front connecting bracket and the rear connecting bracket are both connected to the frame and the underframe; the shock absorber bracket is connected to the shock absorber, an upper control arm and a lower control arm are installed on the control arm bracket, a steering knuckle bracket is connected between the upper control arm and the lower control arm, a steering knuckle is installed on the steering knuckle bracket, a coil spring assembly is installed on the coil spring bracket, and the shock absorber and the coil spring assembly are both connected to the steering knuckle bracket.

7. A front independent suspension system for a heavy truck according to claim 6, It is characterized in that The upper control arm is U-shaped, the lower control arm is A-shaped, and the middle part of the U-shaped upper control arm and the top part of the A-shaped lower control arm are respectively connected to the steering knuckle.

8. The front independent suspension system for a heavy truck according to claim 7, It is characterized in that The coil spring assembly is located on the inner side of the upper control arm, and includes a coil spring, a coil spring pad, a buffer block and a buffer block bracket. The coil spring is arranged between the coil spring bracket and the steering knuckle bracket, the coil spring pad is arranged at both ends of the coil spring, the buffer block bracket is located in the coil spring and the bottom end is connected to the steering knuckle bracket, and the buffer block is located in the coil spring and arranged on the top of the buffer block bracket.

9. The front independent suspension system for a heavy truck according to claim 6, It is characterized in that The steering knuckle bracket is provided with a triangular limiting boss, the limiting boss and the shock absorber are located on the same side of the steering knuckle bracket, and the steering knuckle is provided with a limiting screw for blocking and cooperating with the limiting boss.

10. A heavy truck, It is characterized in that A front independent suspension system for a heavy truck comprising the method described in any one of claims 1 to 9.

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