阅读说明：本技术 一种匹配直推力杆的前桥复合空气悬挂系统 (Front axle composite air suspension system matched with straight thrust rod ) 是由 金鑫 范培斌 洪波 韩艳辉 刘建伟 王海洋 辛梓田 于 2021-10-29 设计创作，主要内容包括：本申请涉及一种匹配直推力杆的前桥复合空气悬挂系统,属于商用车前桥悬架技术领域,包括车架总成,该车架总成包括相互平行且间隔设置的车架纵梁；前桥总成；钢板弹簧,该钢板弹簧呈纵向固定在前桥总成上以弹性支撑车架纵梁；减振气囊,该减振气囊固定位于前桥总成和车架纵梁之间以弹性支撑车架纵梁；防纵倾总成,该防纵倾总成包括固定在前桥总成上的气囊安装支架,以及位于前桥总成的前侧与车架纵梁的底部垂直连接的固定支架,气囊安装支架与固定支架之间连接有呈纵向设置的直推力杆。本申请的前桥总成绕直推力杆与钢板弹簧前端的连接点运动,前桥总成的运动轨迹得到适当的控制,提升车辆行驶时的操控稳定性。(The application relates to a front axle composite air suspension system matched with a straight thrust rod, which belongs to the technical field of front axle suspensions of commercial vehicles and comprises a frame assembly, wherein the frame assembly comprises frame longitudinal beams which are parallel to each other and are arranged at intervals; a front axle assembly; the steel plate spring is longitudinally fixed on the front axle assembly to elastically support the frame longitudinal beam; the damping air bag is fixedly arranged between the front axle assembly and the frame longitudinal beam to elastically support the frame longitudinal beam; the anti-trim assembly comprises an air bag mounting bracket fixed on the front axle assembly and a fixed bracket which is positioned at the front side of the front axle assembly and is vertically connected with the bottom of the frame longitudinal beam, and a straight thrust rod which is longitudinally arranged is connected between the air bag mounting bracket and the fixed bracket. The front axle assembly moves around the connecting point of the straight thrust rod and the front end of the steel plate spring, the motion track of the front axle assembly is properly controlled, and the control stability of the vehicle during running is improved.)

1. A front axle compound air suspension system that matches a straight thrust bar, comprising:

the frame assembly comprises frame longitudinal beams (111) which are parallel to each other and arranged at intervals;

the front axle assembly (104) is transversely positioned at the bottom of the frame assembly and is arranged at intervals with the frame assembly;

the steel plate spring (102), the steel plate spring (102) is longitudinally fixed on the front axle assembly (104) to elastically support the frame longitudinal beam (111);

the vibration-damping air bag (101) is fixedly arranged between the front axle assembly (104) and the frame longitudinal beam (111) to elastically support the frame longitudinal beam (111);

the anti-trim assembly comprises an air bag mounting bracket (103) fixed on a front axle assembly (104) and a fixing bracket (107) which is positioned on the front side of the front axle assembly (104) and is vertically connected with the bottom of a frame longitudinal beam (111), wherein a straight thrust rod (108) which is longitudinally arranged is connected between the air bag mounting bracket (103) and the fixing bracket (107).

2. The straight thrust rod matched front axle compound air suspension system of claim 1 wherein:

the air bag mounting bracket (103) comprises an air bag mounting plate and an anti-tilting thrust plate, and the air bag mounting plate and the anti-tilting thrust plate form an L-shaped structure;

the anti-tilting thrust plate is provided with a mounting hole which is rotatably connected with the rear end of the straight thrust rod (108).

3. The straight thrust rod matched front axle compound air suspension system of claim 2 wherein:

the anti-tilt air bag is characterized in that the air bag mounting plate and the anti-tilt thrust plate are of an integrally cast structure, a mounting hole connected with the air bag mounting plate is formed in the front axle assembly (104), and bolts sequentially penetrating through the air bag mounting plate, the steel plate spring (102) and the front axle assembly (104) downwards are arranged at the bottom of the vibration reduction air bag (101).

4. A straight thrust rod matched front axle compound air suspension system as claimed in claim 1 or 2 wherein:

the straight thrust rod (108) is positioned between the frame longitudinal beam (111) and the steel plate spring (102), and the axis of the straight thrust rod (108) is parallel to the axis of the frame longitudinal beam (111);

the front end of the steel plate spring (102) is rotatably connected with the bottom of the fixing support (107) through the front rolling lug, the front end of the straight thrust rod (108) is rotatably connected with the top of the fixing support (107), and the rear end of the straight thrust rod (108) is rotatably connected with the air bag mounting support (103).

5. The front axle compound air suspension system of claim 4 wherein said straight thrust rod is matched to said straight thrust rod, wherein said straight thrust rod comprises:

the fixing support (107), the front half part of the steel plate spring (102), the air bag mounting support (103) and the straight thrust rod (108) jointly form a parallelogram or rectangular structure.

6. The straight thrust rod matched front axle compound air suspension system of claim 1 wherein:

the length of the straight thrust rod (108) is adjustable, the straight thrust rod (108) comprises a shaft rod, rod end joint bearings are in threaded connection with the two ends of the shaft rod, and locking nuts for fastening the rod end joint bearings on the shaft rod are in threaded connection with the shaft rod.

7. The straight thrust rod matched front axle compound air suspension system of claim 1 wherein:

the middle of the steel plate spring (102) is fixedly connected with the end part of the front axle assembly (104), the front end of the steel plate spring (102) is connected with a frame longitudinal beam (111) through a fixing support (107), and the rear end of the steel plate spring (102) is connected with the frame longitudinal beam (111) through a lifting lug support (110).

8. The straight thrust rod matched front axle compound air suspension system of claim 7 wherein:

the rear end of the steel plate spring (102) is provided with a rear rolling lug, and the rear rolling lug is rotatably connected with the lifting lug support (110) through a lifting lug (109).

9. The straight thrust rod matched front axle compound air suspension system of claim 1 wherein:

the middle part of the steel plate spring (102) is clamped and fixed between the air bag mounting bracket (103) and the front axle assembly (104).

10. The straight thrust rod matched front axle compound air suspension system of claim 1 wherein:

the front end of the straight thrust rod (108) is hinged with the fixed support (107) through a pin shaft, and the rear end of the straight thrust rod (108) is hinged with the air bag mounting support (103) through a pin shaft.

Technical Field

The application relates to the technical field of front axle suspensions of commercial vehicles, in particular to a front axle composite air suspension system matched with a straight thrust rod.

Background

With the development of the automobile industry and the continuous improvement of road traffic, the demand of high-grade commercial vehicles is increasing, and the vehicle becomes the development direction of the commercial vehicles. One of the important standards of high-grade commercial vehicles is to adopt an all-air suspension, and the suspension parts produced in China at present are divided into two categories, namely a leaf spring type suspension and an air suspension, wherein the air suspension can be divided into the all-air suspension and a composite type suspension, namely a suspension system consisting of a leaf spring and an air bag.

The plate spring type suspension front suspension structure consists of a frame longitudinal beam, a cross beam, a plate spring and a bracket thereof, a shock absorber and an upper bracket and a lower bracket thereof, wherein vertical load is borne by the plate spring, so that the vibration isolation performance of the system is poor, the smoothness is poor, the vehicle height change is large when the vehicle is empty and fully loaded, namely the ride and fall performance is poor, but the anti-roll capability is stronger than that of a combined type air suspension.

The combined type air suspension front suspension structure is described with reference to fig. 1, and comprises a frame longitudinal beam 9, a steel plate spring 2, a front axle 4, a front plate spring support 6, a rear plate spring support 8, a lifting lug 7, a vibration reduction air bag 1 and a lower support 3 thereof, wherein the vertical load of an automobile is jointly borne by the steel plate spring 2 and the vibration reduction air bag 1, and the vibration reduction performance and the smoothness of the automobile are improved in comparison with the plate spring suspension. .

However, the composite air suspension front suspension structure has a gap with higher level commercial vehicle standards, and the anti-pitching capability of the composite air suspension front suspension relative to the leaf spring type suspension is reduced. The rigidity of the steel plate spring 2 is small, the strength of the steel plate spring 2 for resisting longitudinal torsion is insufficient, longitudinal torsion deformation is large, and the change of the caster angle of the front axle is large; the steel plate spring 2 has weak guiding rigidity and insufficient guiding capacity, which affects the control stability when the vehicle runs.

Disclosure of Invention

The embodiment of the application provides a front axle composite air suspension system matched with a straight thrust rod, and aims to solve the problems that in the related art, the anti-pitching capacity of a composite air suspension front suspension structure is weak, and the control stability of a vehicle during running is influenced.

The embodiment of the application provides a compound air suspension system of front axle who matches straight thrust pole includes:

the frame assembly comprises frame longitudinal beams which are parallel to each other and arranged at intervals;

the front axle assembly is transversely positioned at the bottom of the frame assembly and is arranged at intervals with the frame assembly;

the steel plate spring is longitudinally fixed on the front axle assembly to elastically support the frame longitudinal beam;

the damping air bag is fixedly positioned between the front axle assembly and the frame longitudinal beam to elastically support the frame longitudinal beam;

the anti-trim assembly comprises an air bag mounting bracket fixed on the front axle assembly and a fixing bracket which is positioned on the front side of the front axle assembly and is vertically connected with the bottom of the frame longitudinal beam, and a straight thrust rod which is longitudinally arranged is connected between the air bag mounting bracket and the fixing bracket.

The utility model provides a compound air suspension system of front axle has add on the basis of current combined type air suspension front suspension structure and has prevented the trim assembly, should prevent the trim assembly including having set up the gasbag installing support on the front axle assembly to and be located the fixed bolster that the front side of front axle assembly and solebar's bottom are connected perpendicularly, be connected with between gasbag installing support and the fixed bolster and be the straight thrust pole of vertical setting.

One end of the straight thrust rod is connected with the air bag mounting bracket, and the other end of the straight thrust rod is connected with the fixed bracket. The straight thrust rod, the front half part of the steel plate spring, the fixed support and the air bag mounting seat form a mechanism similar to a parallelogram. The front axle assembly moves around the connecting point of the straight thrust rod and the front end of the steel plate spring, the movement track of the front axle assembly is properly controlled, and the control stability of the vehicle during running is improved.

In some embodiments: in order to improve the longitudinal torsion prevention capability of the air bag mounting bracket, the air bag mounting bracket comprises an air bag mounting plate and an anti-tilting thrust plate, wherein the air bag mounting plate and the anti-tilting thrust plate form an L-shaped structure;

the anti-tilting thrust plate is provided with a mounting hole which is rotatably connected with the rear end of the straight thrust rod.

In some embodiments: for the convenience of simplifying the structure and the assembly convenience of this application anti-trim assembly, the gasbag mounting panel of this application embodiment is with prevent inclining thrust plate casting shaping structure as an organic whole, set up the mounting hole of being connected with the gasbag mounting panel on the front axle assembly, the bottom of damping gasbag is equipped with the bolt that passes gasbag mounting panel, leaf spring and front axle assembly downwards in proper order.

In some embodiments: in order to facilitate the simplification of the structure of the anti-pitching assembly and the improvement of the anti-pitching capacity, the straight thrust rod of the embodiment of the application is positioned between the frame longitudinal beam and the steel plate spring, and the axis of the straight thrust rod is parallel to the axis of the frame longitudinal beam;

the front end of the steel plate spring is rotatably connected with the bottom of the fixed support through the front rolling lug, the front end of the straight thrust rod is rotatably connected with the top of the fixed support, and the rear end of the straight thrust rod is rotatably connected with the air bag mounting support.

In some embodiments: in order to facilitate the structure of this application anti-pitch assembly and improve anti-pitch ability, the parallelogram or rectangle structure has been constituteed jointly to the fixed bolster of this application embodiment, leaf spring's first half, gasbag installing support and straight thrust pole.

In some embodiments: for the convenience of simplifying this application and preventing the structure of pitch assembly and improving and prevent the longitudinal torsion ability, the length of the straight thrust rod of this application embodiment is adjustable, straight thrust rod includes the axostylus axostyle, the equal threaded connection in both ends of axostylus axostyle has rod end joint bearing, threaded connection has the lock nut of fastening rod end joint bearing on the axostylus axostyle.

In some embodiments: for the convenience of simplifying the structure of this application anti-trim assembly and improving anti-longitudinal-torsional ability, the middle part of the leaf spring of this application embodiment is connected with the tip fixed connection of front axle assembly, leaf spring's front end is passed through the fixed bolster and is connected with the solebar, leaf spring's rear end is passed through the lug support and is connected with the solebar.

In some embodiments: in order to facilitate the adjustment of the back inclination angle of the vehicle, the rear end of the steel plate spring is provided with a rear rolling lug, and the rear rolling lug is rotatably connected with the lifting lug support through a lifting lug.

In some embodiments: in order to facilitate the installation and the fixation of the leaf spring, the middle part of the leaf spring is clamped and fixed between the air bag mounting bracket and the front axle assembly.

In some embodiments: in order to only bear the axial force, the front end of the straight thrust rod is hinged to the fixed support through a pin shaft, and the rear end of the straight thrust rod is hinged to the air bag mounting support through a pin shaft.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a front axle composite air suspension system matched with a straight thrust rod, and the front axle composite air suspension system is provided with a frame assembly, wherein the frame assembly comprises frame longitudinal beams which are parallel to each other and arranged at intervals; the front axle assembly is transversely positioned at the bottom of the frame assembly and is arranged at intervals with the frame assembly; the steel plate spring is longitudinally fixed on the front axle assembly to elastically support the frame longitudinal beam; the damping air bag is fixedly arranged between the front axle assembly and the frame longitudinal beam to elastically support the frame longitudinal beam; the anti-trim assembly comprises an air bag mounting bracket fixed on the front axle assembly and a fixed bracket which is positioned at the front side of the front axle assembly and is vertically connected with the bottom of the frame longitudinal beam, and a straight thrust rod which is longitudinally arranged is connected between the air bag mounting bracket and the fixed bracket.

Therefore, the composite air suspension system of the front axle adds the anti-pitching assembly on the basis of the existing composite air suspension front suspension structure, the anti-pitching assembly comprises an air bag mounting bracket arranged on the front axle assembly and a fixing bracket which is positioned at the front side of the front axle assembly and is vertically connected with the bottom of the frame longitudinal beam, and a straight thrust rod which is longitudinally arranged is connected between the air bag mounting bracket and the fixing bracket. One end of the straight thrust rod is connected with the air bag mounting bracket, and the other end of the straight thrust rod is connected with the fixed bracket. The straight thrust rod, the front half part of the steel plate spring, the fixed support and the air bag mounting seat form a mechanism similar to a parallelogram. The front axle assembly moves around the connecting point of the straight thrust rod and the front end of the steel plate spring, the movement track of the front axle assembly is properly controlled, and the control stability of the vehicle during running is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a composite air suspension front suspension structure in the prior art;

FIG. 2 is a schematic structural diagram of an embodiment of the present application;

FIG. 3 is a schematic structural view of the vehicle frame assembly according to an embodiment of the present disclosure.

Reference numerals:

101. a vibration-damping air bag; 102. a leaf spring; 103. an airbag mounting bracket; 104. a front axle assembly; 105. a bolt; 106. a nut; 107. fixing a bracket; 108. a straight thrust rod; 109. lifting lugs; 110. a lifting lug support; 111. a frame rail.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a front axle composite air suspension system matched with a straight thrust rod, and the problem that the anti-pitching capacity of a composite air suspension front suspension structure in the related art is weak, and the control stability of a vehicle during running is influenced can be solved.

Referring to fig. 2 and 3, an embodiment of the present application provides a front axle compound air suspension system matching a straight thrust rod, comprising:

the frame assembly comprises two frame longitudinal beams 111 which are parallel to each other and arranged at intervals, is of a frame structure bridged on front and rear axles of an automobile, is commonly called a crossbeam and is a base body of the automobile. The two frame rails 111 and the cross members are supported on the wheels via suspension, front axle and rear axle. The frame assembly has sufficient strength and rigidity to withstand the load of the vehicle and the impact transmitted from the wheels. The frame assembly is used for supporting and connecting all assemblies of the automobile, keeping all the assemblies in a relatively correct position and bearing various loads inside and outside the automobile.

A front axle assembly 104, the front axle assembly 104 is transversely located at the bottom of the frame assembly and is arranged at an interval with the frame assembly, the front axle assembly 104 of the embodiment of the present application is a driven axle, also called a steering axle, and is arranged at the front end of the vehicle, so called a front axle. Front axle assembly 104 is coupled to the steering system with a knuckle. The steering force output by the steering gear can be transmitted to the wheels to achieve steering of the vehicle. The front axle assembly 104 supports the sprung mass at the front of the vehicle, bears vertical loads, and also bears various longitudinal, lateral and related moments.

And a leaf spring 102, wherein the leaf spring 102 is longitudinally fixed on the front axle assembly 104 to elastically support the frame rail 111. The leaf spring 102 is an elastic beam with approximately equal strength, which is formed by combining a plurality of alloy spring pieces with equal width but unequal length (the thickness can be equal or unequal). The leaf spring 102 of this embodiment is a few leaf spring, which is formed by stacking two thin steel sheets with equal width and equal thickness. The steel plate with few leaf springs has large section change, and the sections from the middle to the two ends are gradually different. Compared with a plurality of leaf springs, the few leaf springs are lighter by about 50% than the plurality of leaf springs under the condition of the same rigidity (namely the same bearing capacity), so that the oil consumption is reduced, and the driving smoothness is improved. And the single leaf springs are in point contact with each other, so that the relative friction and vibration are reduced, and the riding comfort is improved. The leaf spring 102 is preferably a few leaf springs with two leaf springs stacked.

And a vibration damping air bag 101, wherein the vibration damping air bag 101 is fixedly arranged between the front axle assembly 104 and the frame longitudinal beam 111 to elastically support the frame longitudinal beam 111. The damping bladder 101 is a sealed container filled with compressed air, and its elastic action is achieved by utilizing the compressibility of the gas. The vibration-damping airbag 101 has ideal nonlinear elastic characteristics, after the height adjusting device is additionally arranged, the height of the vehicle body does not change along with the increase and decrease of the load, the spring stiffness can be designed to be lower, and the riding comfort is good. The vibration-damping airbag 101 can not only suppress the vibration transmitted from the wheel end to the vehicle body, but the vibration-damping airbag 101 can also adjust the height of the suspension system by inflating and deflating to adjust the vehicle height to the requested height.

The anti-pitching assembly comprises an air bag mounting bracket 103 fixed on a front axle assembly 104, and a fixing bracket 107 positioned on the front side of the front axle assembly 104 and vertically connected with the bottom of a frame longitudinal beam 111, wherein a straight thrust rod 108 arranged longitudinally is connected between the air bag mounting bracket 103 and the fixing bracket 107. Two ends of the straight thrust rod 108 are respectively connected with the fixed bracket 107 fixedly connected with the frame longitudinal beam 111 and the air bag mounting bracket 103 fixedly connected with the front axle assembly 104, so that the guiding rigidity of the composite air suspension is enhanced, the guiding capability of the strong composite air suspension is improved, the longitudinal torsion of the front axle assembly 104 and the steel plate spring 102 is limited, and the stress of the steel plate spring 102 is reduced. In addition, the anti-pitching assembly cooperates with leaf spring 102 to better limit the displacement of front axle assembly 104 and reduce the change in caster angle of the front axle as the vehicle travels.

The front axle composite air suspension system of the embodiment of the application adds the anti-pitching assembly on the basis of the existing composite air suspension front suspension structure, the anti-pitching assembly comprises an air bag mounting bracket 103 arranged on a front axle assembly 104 and a fixing bracket 107 vertically connected with the bottom of a frame longitudinal beam 111 and positioned on the front side of the front axle assembly 104, and a straight thrust rod 108 longitudinally arranged is connected between the air bag mounting bracket 103 and the fixing bracket 107. The straight thrust rod 108 has one end connected to the airbag mounting bracket 103 and the other end connected to the fixing bracket 107. The straight thrust rod 108, the front half part of the steel plate spring 102, the fixing bracket 107 and the air bag mounting bracket 103 form a parallelogram-like mechanism together. The front axle assembly 104 moves around the connecting point of the straight thrust rod 108 and the front end of the steel plate spring 102, the movement track of the front axle assembly 104 is properly controlled, and the control stability of the vehicle during running is improved.

In some alternative embodiments: referring to fig. 2 and 3, the embodiment of the present application provides a front axle composite air suspension system matched with a straight thrust rod, and an airbag mounting bracket 103 of the front axle composite air suspension system matched with the straight thrust rod comprises an airbag mounting plate and an anti-tilt thrust plate, wherein the airbag mounting plate is horizontally positioned between a damping airbag 101 and a steel plate spring 102 to provide mounting and positioning for the damping airbag 101. The anti-tilt thrust plate is vertically connected with one end of the air bag mounting plate, extends vertically upwards and is connected with the rear end of the straight thrust rod 108.

The air bag mounting plate and the anti-tilting thrust plate form an L-shaped structure. The airbag mounting bracket 103 of the embodiment of the application is composed of an airbag mounting plate and an anti-tilting thrust plate, the airbag mounting plate of the airbag mounting bracket 103 can fix the vibration reduction airbag 101 on the front axle assembly 104 through the airbag mounting bracket 103, meanwhile, the anti-tilting thrust plate on the airbag mounting bracket 103 transmits the longitudinal torque of the front axle assembly 104 and the longitudinal torque of the steel plate spring 102 to the straight thrust rod 108, because the front end of the straight thrust rod 108 is connected with the fixing bracket 107 fixed on the frame longitudinal beam 111, and then the longitudinal torque of the front axle assembly 104 and the longitudinal torque of the steel plate spring 102 are restrained by the straight thrust rod 108 and the fixing bracket 107.

In some alternative embodiments: referring to fig. 2 and 3, in the embodiment of the present application, a front axle composite air suspension system matched with a straight thrust rod is provided, a bolt hole fixedly connected with a vibration damping airbag 101 and a front axle assembly 104 is formed on an airbag mounting plate of the front axle composite air suspension system matched with the straight thrust rod, and a mounting hole rotatably connected with a rear end of the straight thrust rod 108 is formed on an anti-tilt thrust plate.

Prevent inclining thrust plate includes two "L" shape bent plates that are parallel to each other and the interval sets up, and the one end and the gasbag mounting panel of two "L" shape bent plates are connected, and the round hole that is used for connecting straight thrust bar 108 rear end is all offered to the other end of two "L" shape bent plates, and straight thrust bar 108 rear end is located between the other end of two "L" shape bent plates. The front end of the straight thrust rod 108 is hinged with the fixed support 107 through a pin shaft, and the rear end of the straight thrust rod 108 is hinged with the other ends of the two L-shaped bent plates through a pin shaft.

The airbag mounting plate and the anti-tilting thrust plate are of an integrally cast structure, and the front axle assembly 104 is provided with a mounting hole connected with the airbag mounting plate. The bottom of the damping air bag 101 is provided with a bolt 105 which passes through the air bag mounting plate, the leaf spring 102 and the front axle assembly 104 in sequence. The middle part of the steel plate spring 102 is clamped and fixed between the air bag mounting bracket 103 and the front axle assembly 104, the bolt 105 penetrates through the air bag mounting plate, the steel plate spring 102 and the front axle assembly 104 from top to bottom in sequence, the nut 106 is fastened on the bolt 105, and the air bag mounting plate, the steel plate spring 102 and the front axle assembly 104 are fastened together by the bolt 105 and the nut 106.

The bolt 105 sequentially penetrates through the air bag mounting plate, the steel plate spring 102 and the front axle assembly 104 from top to bottom and is connected with the nut 106, so that the convenience of assembling and fastening the air bag mounting plate, the steel plate spring 102 and the front axle assembly 104 is improved, and the assembly and the maintenance are facilitated.

In some alternative embodiments: referring to fig. 2 and 3, the embodiment of the present application provides a matching straight thrust rod front axle compound air suspension system, wherein the straight thrust rod 108 of the matching straight thrust rod front axle compound air suspension system is located between the frame rail 111 and the leaf spring 102, and the axis of the straight thrust rod 108 is approximately parallel to the axis of the frame rail 111. The fixed bracket 107, the front half of the leaf spring 102, the airbag mounting bracket and the straight thrust bar together form a parallelogram or rectangular structure.

The middle part of the leaf spring 102 is fixedly connected with the end part of the front axle assembly 104, the front end of the leaf spring 102 is connected with the frame longitudinal beam 111 through the fixing bracket 107, and the rear end of the leaf spring 102 is connected with the frame longitudinal beam 111 through the lifting lug bracket 110. The front end of the leaf spring 102 is rotatably connected with the bottom of the fixed bracket 107 through a front rolling lug, the front end of the straight thrust rod 108 is rotatably connected with the top of the fixed bracket 107, and the rear end of the straight thrust rod 108 is rotatably connected with the anti-tilting thrust plate of the air bag mounting bracket 103. The rear end of the leaf spring 102 is provided with a rear rolling lug, and the rear rolling lug is rotatably connected with the lifting lug support 110 through a lifting lug 109.

The top of the fixing bracket 107 is provided with a top plate abutting against the lower flange plate of the frame rail 111 and a lap plate fixedly connected to the web plate of the frame rail 111 by a bolt or a rivet. The bottom of the fixed support 107 is provided with two vertical plates connected with the front end of the straight thrust rod 108 and the front eye of the leaf spring 102, and the two vertical plates are parallel to each other and arranged at intervals. The front end of the straight thrust rod 108 and the front rolling lug of the leaf spring 102 are both located between two risers, and the front end of the straight thrust rod 108 is located above the front rolling lug of the leaf spring 102.

In some alternative embodiments: referring to fig. 2 and 3, an embodiment of the present application provides a front axle composite air suspension system matched with a straight thrust rod, a length of a straight thrust rod 108 of the front axle composite air suspension system matched with the straight thrust rod is adjustable, the straight thrust rod 108 includes a shaft rod, a rod end joint bearing is in threaded connection with both ends of the shaft rod, and a lock nut for fastening the rod end joint bearing on the shaft rod is in threaded connection with the shaft rod.

The straight thrust rod 108 is composed of the shaft rod, the rod end joint bearing and the locking nut, and the whole length of the straight thrust rod 108 is adjusted by respectively connecting the rod end joint bearing with the two ends of the shaft rod in a threaded mode. The end knuckle bearing is rotated forward and backward on the shaft rod, so that the rotating motion of the end knuckle bearing is converted into the linear motion of the end knuckle bearing, the distance between the end knuckle bearing and the shaft rod is adjusted, and the length of the straight thrust rod 108 is extended or shortened.

The straight thrust rod 108 is set to be of a length-adjustable structure, the length of the straight thrust rod 108 is adjusted through micro-motion to adapt to the assembly error of the anti-pitching assembly, and the assembly precision of the anti-pitching assembly is guaranteed. Meanwhile, the straight thrust rod 108 is arranged to be of a length-adjustable structure, so that the anti-pitching capability of the anti-pitching assembly can be adjusted, the anti-pitching capability of the anti-pitching assembly can be increased by means of the length extension of the straight thrust rod 108, and the anti-pitching capability of the anti-pitching assembly can be reduced by means of the length shortening of the straight thrust rod 108.

Principle of operation

The embodiment of the application provides a front axle composite air suspension system matched with a straight thrust rod, and the front axle composite air suspension system is provided with a frame assembly, wherein the frame assembly comprises frame longitudinal beams 111 which are parallel to each other and are arranged at intervals; a front axle assembly 104, the front axle assembly 104 being transversely positioned at the bottom of the frame assembly and spaced from the frame assembly; a leaf spring 102, the leaf spring 102 being longitudinally fixed to the front axle assembly 104 to elastically support the frame rail 111; a vibration-damping airbag 101, the vibration-damping airbag 101 being fixedly disposed between the front axle assembly 104 and the frame rail 111 to elastically support the frame rail 111; the anti-pitching assembly comprises an air bag mounting bracket 103 fixed on a front axle assembly 104 and a fixing bracket 107 positioned on the front side of the front axle assembly 104 and vertically connected with the bottom of a frame longitudinal beam 111, wherein a straight thrust rod 108 which is longitudinally arranged is connected between the air bag mounting bracket 103 and the fixing bracket 107.

Therefore, the front axle composite air suspension system of the application is additionally provided with the anti-pitching assembly on the basis of the existing composite air suspension front suspension structure, the anti-pitching assembly comprises an air bag mounting bracket 103 arranged on the front axle assembly 104 and a fixing bracket 107 which is positioned on the front side of the front axle assembly 104 and is vertically connected with the bottom of the frame longitudinal beam 111, and a straight thrust rod 108 which is longitudinally arranged is connected between the air bag mounting bracket 103 and the fixing bracket 107. The straight thrust rod 108 has one end connected to the airbag mounting bracket 103 and the other end connected to the fixing bracket 107. The straight thrust rod 108, the front half part of the steel plate spring 102, the fixing bracket 107 and the air bag mounting bracket 103 form a parallelogram-like mechanism together. The front axle assembly 104 moves around the connecting point of the straight thrust rod 108 and the front end of the steel plate spring 102, the movement track of the front axle assembly 104 is properly controlled, and the control stability of the vehicle during running is improved.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.