CN212267624U - Turn to trapezoidal mechanism and car - Google Patents

Abstract

The application discloses turn to trapezoidal mechanism and car includes: rocking arm assembly and be used for the rocking arm pull rod assembly who is connected with the direction machine, the rocking arm assembly is including installation sleeve, first linking arm, second linking arm and be used for installing the base on sub vehicle frame, the installation sleeve is rotationally installed on the base, the first end of first linking arm and the first end of second linking arm are all installed on the telescopic lateral wall of installation, the second of first linking arm is held and is had first fixed orifices, rocking arm pull rod assembly and first fixed orifices are connected, the second of second linking arm is held and is had the second fixed orifices that is used for being connected with steering linkage assembly. The connecting length of the steering pull rod assembly can be increased by utilizing the steering mechanism, so that the position of the steering mechanism can move forwards, the interference of the steering mechanism and the motor, the pipe column intermediate shaft and the half shaft can be avoided, the space requirement is provided for the arrangement of a steering system, and the design requirement of a vehicle is met.

Description

Turn to trapezoidal mechanism and car

Technical Field

The application relates to the technical field of automobiles, in particular to a steering trapezoid mechanism and an automobile.

Background

The steering trapezoid mechanism is a trapezoid formed by a front shaft, a steering tie rod, a left trapezoid arm and a right trapezoid arm in a suspension device of a front shaft of an automobile, and has the function of ensuring that the corner of an inner wheel and the corner of an outer wheel keep a certain relation when the automobile runs in a turning process, so that all wheels can wind an instant steering center as far as possible, and the wheels can roll on different circumferences without sliding. On automobiles that employ independent front suspensions, the steering ladder mechanism typically employs a disconnected steering ladder.

Conventional breakup divert trapezoids are commonly referred to as leading and trailing trapezoids. Most of the traditional fuel vehicles adopt a rear trapezoid, so that the arrangement space of an engine can be avoided. And the new energy vehicle needs a larger battery pack, and a large enough space can be reserved for the battery pack by adopting the front trapezoidal mechanism. The inventor discovers at the in-process of realizing this application that the knuckle is connected through the steering linkage assembly with the steering gear, leads to the space limited, if the motor is arranged to the front axle, will occupy the space of arranging of steering gear, and the half axle also can occupy the space of arranging of steering column simultaneously, causes unable arrangement a steering system, hardly satisfies the actual demand of vehicle.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application provides a steering ladder mechanism and an automobile to solve the above technical problems.

The application provides a turn to trapezoidal mechanism, it includes: the rocker arm assembly comprises an installation sleeve, a first connecting arm, a second connecting arm and a base, wherein the base is used for being installed on an auxiliary frame, the installation sleeve is rotatably installed on the base, the first end of the first connecting arm and the first end of the second connecting arm are both installed on the outer side wall of the installation sleeve, a first fixing hole is formed in the second end of the first connecting arm, the rocker arm pull rod assembly is connected with the first fixing hole, a second fixing hole used for being connected with the steering pull rod assembly is formed in the second end of the second connecting arm, the connection length of the steering pull rod assembly is increased, the position of the steering gear can move forwards, interference between the steering gear and a motor, between a pipe column intermediate shaft and a half shaft can be avoided, space requirements are provided for arrangement of a steering system, and design requirements of vehicles are met, but also be favorable to reducing the universal joint fork contained angle, be favorable to arranging the universal joint contained angle of the left and right sides equally to optimize the fluctuation of steering torque, make to turn to more steadily. Simultaneously, set up the rocker arm assembly into the form of base, installation sleeve, first linking arm and second linking arm, not only increased the design hard spot of rocker arm assembly, made the adjustment of design hard spot have more design modes, can obtain more excellent ackerman steering characteristic and other and operate the steady ability, through setting up the proportion of two linking arm lengths in addition, under the condition of rotating the same tire corner, can reduce the stroke of traversing mechanism, optimize and rotate the drive ratio, guarantee the promptness that turns to.

Optionally, the rocker arm pull rod assembly comprises a rocker arm pull rod inner spherical hinge, a rocker arm pull rod outer spherical hinge and a rocker arm pull rod, two ends of the rocker arm pull rod are respectively fixedly connected with a ball seat of the rocker arm pull rod inner spherical hinge and a ball seat of the rocker arm pull rod outer spherical hinge, a ball pin of the rocker arm pull rod inner spherical hinge is connected with the steering gear, and a ball pin of the rocker arm pull rod outer spherical hinge is installed in the first fixing hole, so that the structure can be simplified, and the cost can be reduced.

Optionally, be provided with the connecting rod on the ball seat of ball pivot in the rocking arm pull rod, be provided with on the connecting rod be used for with the mounting hole border butt of direction machine rack spacing bellying and be used for with the external screw thread of mounting hole spiro union, spacing bellying is located between the ball seat of ball pivot in external screw thread and the rocking arm pull rod, not only makes things convenient for the assembly, but also can avoid the connecting rod to twist the mounting hole too deeply, guarantees the uniformity of assembly, improves assembly efficiency.

Optionally, the base is including being used for the base plate of being connected with sub vehicle frame, the base plate deviates from the face of sub vehicle frame and extends the cylinder along the direction of keeping away from the sub vehicle frame, the cylinder passes through the rotation bearing and installs in the installation sleeve, not only can simplify the structure, and reduce cost, the cylinder passes through the swivel bearing to be installed in the installation sleeve moreover, can guarantee the telescopic normal rotation of installation, guarantees the normal clear of work.

Optionally, the rocking arm assembly still includes the snap ring, be provided with the support convex part on the circumference lateral wall of the first end that is close to the base plate on the cylinder, be provided with the inserting groove on the circumference lateral wall of the second end of keeping away from the base plate on the cylinder, swivel bearing is located between support convex part and the inserting groove, snap ring and inserting groove joint when avoiding installation sleeve and base plate to interfere, still can make things convenient for swivel bearing's loading and unloading, improve handling efficiency.

Optionally, the mounting sleeve includes a pipe body and a cover plate, the cover plate is detachably covered on the pipe body, the cover plate protrudes towards a direction away from the base plate towards the surface of the base plate to form a recessed portion, the pipe body is sleeved on the rotary bearing, the cylinder protrudes out of the rotary bearing and is located in the recessed portion, and the first connecting arm and the second connecting arm are both arranged on the outer pipe wall of the pipe body. Through setting up the installation sleeve into body and lid, apron detachably lid is established on the body, when guaranteeing that the foreign matter gets into in the installation sleeve, still can make things convenient for swivel bearing's loading and unloading, improves handling efficiency.

Optionally, the steering linkage assembly includes a steering linkage, a steering linkage inner ball hinge and a steering linkage outer ball hinge, a ball pin of the steering linkage inner ball hinge is fixedly installed in the second fixing hole, a ball seat of the steering linkage inner ball hinge and a ball seat of the steering linkage outer ball hinge are connected through the steering linkage, and a ball pin of the steering linkage outer ball hinge is used for being fixed on the steering knuckle, so that the structure is simplified, and the cost is reduced.

Optionally, the steering linkage device further comprises a first fixing nut and a second fixing nut, the ball pin of the ball hinge outside the rocker arm pull rod penetrates through a first fixing hole, the first fixing nut is screwed on the ball pin of the ball hinge outside the rocker arm pull rod and located outside the first fixing hole, the ball pin of the ball hinge inside the steering linkage penetrates through a second fixing hole, and the second fixing nut is screwed on the ball pin of the ball hinge inside the steering linkage and located outside the second fixing hole. The outer spherical hinge of the rocker arm pull rod is fixed through the first fixing nut, and the inner spherical hinge of the steering pull rod is fixed through the second fixing nut, so that the assembly and disassembly can be facilitated, and the assembly and disassembly efficiency can be improved.

Optionally, still include sub vehicle frame, knuckle, preceding underarm and back underarm, be provided with preceding underarm bush and preceding underarm outer spherical hinge on preceding underarm length direction's the both ends respectively, be provided with back underarm bush and back underarm outer spherical hinge on the back underarm length direction's the both ends respectively, preceding underarm bush, back underarm bush all pass through bolted connection with the sub vehicle frame, the ball round pin of preceding underarm outer spherical hinge and back underarm outer spherical hinge is installed on the knuckle to convenient loading and unloading improves handling efficiency.

The application still provides an automobile, it includes the direction machine and at least two as above turn to trapezoidal mechanism, the direction machine is connected with two at least turn to trapezoidal mechanism respectively, the connection length of multiplicable steering linkage assembly for the position of direction machine can the antedisplacement, not only can avoid the interference of direction machine and motor, tubular column jackshaft and semi-axis, for the arrangement of a steering system provides the space demand, satisfy the designing requirement of vehicle, and be favorable to reducing the universal joint fork contained angle, be favorable to arranging the universal joint contained angle of the left and right sides equal, thereby optimize the fluctuation of steering torque, make to turn to more steadily. Simultaneously, set up the rocker arm assembly into the form of base, installation sleeve, first linking arm and second linking arm, not only increased the design hard spot of rocker arm assembly, made the adjustment of design hard spot have more design modes, can obtain more excellent ackerman steering characteristic and other and operate the steady ability, through setting up the proportion of two linking arm lengths in addition, under the condition of rotating the same tire corner, can reduce the stroke of traversing mechanism, optimize and rotate the drive ratio, guarantee the promptness that turns to.

The application provides a turn to trapezoidal mechanism and car is through setting up rocking arm assembly and rocking arm pull rod assembly, rocking arm pull rod assembly is connected with direction machine and first fixed orifices respectively, the second fixed orifices is connected with the steering linkage assembly, the connection length of multiplicable steering linkage assembly, make the position of direction machine can the antedisplacement, not only can avoid direction machine and motor, the interference of tubular column jackshaft and semi-axis, provide the space demand for steering system's arrangement, satisfy the designing requirement of vehicle, and also be favorable to reducing the universal joint fork contained angle, be favorable to arranging the universal joint contained angle of the left and right sides equal, thereby optimize the fluctuation of steering moment, make to turn to more steadily. Simultaneously, set up the rocker arm assembly into the form of base, installation sleeve, first linking arm and second linking arm, not only increased the design hard spot of rocker arm assembly, made the adjustment of design hard spot have more design modes, can obtain more excellent ackerman steering characteristic and other and operate the steady ability, through setting up the proportion of two linking arm lengths in addition, under the condition of rotating the same tire corner, can reduce the stroke of traversing mechanism, optimize and rotate the drive ratio, guarantee the promptness that turns to.

Drawings

Fig. 1 is a schematic structural view of a steering ladder mechanism of the present application.

FIG. 2 is a partial schematic view of the steering ladder mechanism of the present application.

FIG. 3 is a partial cross-sectional view of the rocker arm assembly of the present application.

Detailed Description

The technical solutions of the present application are described in detail below with reference to the accompanying drawings and specific embodiments. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Fig. 1 shows a schematic structural diagram of a turning ladder structure of the present application, and as shown in fig. 1, the present application provides a turning ladder structure, which includes: a rocker arm assembly 7 and a rocker arm pull rod assembly 9 for connecting with the steering gear 2.

The rocker arm assembly 7 comprises a mounting sleeve, a first connecting arm 7-f, a second connecting arm 7-g and a base 7-a for mounting on the subframe 1.

The mounting sleeve is rotatably mounted on the base 7-a, and the first ends of the first and second connecting arms 7-f and 7-g are mounted on the outer side wall of the mounting sleeve.

The second end of the first connecting arm 7-f is provided with a first fixing hole, the rocker arm and pull rod assembly 9 is connected with the first fixing hole, and the second end of the second connecting arm 7-g is provided with a second fixing hole used for being connected with the steering pull rod assembly 6.

During assembly, the base 7-a of the rocker arm assembly 7 is mounted on the subframe 1, and the mounting sleeve is mounted on the base 7-a.

Then, the rocker arm pull rod assembly 9 is respectively connected with the steering gear 2 and the first fixing hole, and the second fixing hole is connected with the steering pull rod assembly 6. Due to the arrangement of the rocker arm assembly 7 and the rocker arm pull rod assembly 9, the length of the steering pull rod assembly 6 is prolonged, and the position of the steering gear 2 can be moved forwards.

The existing disconnected front trapezoid has the defects that the arrangement position of a steering gear is closer to a steering wheel, the included angle of a universal joint fork of a middle shaft of a steering column is larger, and the included angles of universal joints on the left side and the right side are difficult to be arranged equally.

With the position antedisplacement of direction machine 2 for the distance increase of direction machine 2 and steering wheel is favorable to reducing the universal joint fork contained angle, is favorable to arranging the universal joint contained angle of the left and right sides equal, thereby optimizes the fluctuation of steering torque, makes to turn to more stably.

The application provides a turn to trapezoidal mechanism is through setting up rocking arm assembly and rocking arm pull rod assembly, rocking arm pull rod assembly is connected with steering gear and first fixed orifices respectively, the second fixed orifices is connected with the steering gear assembly, multiplicable steering gear assembly's connection length, make the position of steering gear can the antedisplacement, not only can avoid steering gear and motor, the interference of tubular column jackshaft and semi-axis, for the arrangement of a steering system provides the space demand, satisfy the designing requirement of vehicle, and also be favorable to reducing the universal joint fork contained angle, be favorable to arranging the universal joint contained angle of the left and right sides equal, thereby optimize the fluctuation of turning moment, make to turn to more steadily. Simultaneously, set up the rocker arm assembly into the form of base, installation sleeve, first linking arm and second linking arm, not only increased the design hard spot of rocker arm assembly, made the adjustment of design hard spot have more design modes, can obtain more excellent ackerman steering characteristic and other and operate the steady ability, through setting up the proportion of two linking arm lengths in addition, under the condition of rotating the same tire corner, can reduce the stroke of traversing mechanism, optimize and rotate the drive ratio, guarantee the promptness that turns to.

Further, the rocker arm pull rod assembly 9 comprises a rocker arm pull rod inner spherical hinge 9-a, a rocker arm pull rod outer spherical hinge 9-b and a rocker arm pull rod.

Two ends of the rocker arm pull rod are respectively and fixedly connected with a ball seat of the rocker arm pull rod inner spherical hinge 9-a and a ball seat of the rocker arm pull rod outer spherical hinge 9-b.

The ball pin of the rocker arm pull rod inner ball hinge 9-a is connected with the steering gear, and the ball pin of the rocker arm pull rod outer ball hinge 9-b is arranged in the first fixing hole.

The rocker arm pull rod assembly 9 is provided with the rocker arm pull rod inner spherical hinge 9-a, the rocker arm pull rod outer spherical hinge 9-b and the rocker arm pull rod, so that the structure can be simplified, and the cost can be reduced.

Preferably, a connecting rod is arranged on a ball seat of the spherical hinge 9-a in the rocker arm pull rod, a limiting bulge and an external thread are arranged on the connecting rod, and the limiting bulge is positioned between the external thread and the ball seat of the spherical hinge in the rocker arm pull rod. The steering gear box 2 is provided with a rack, the end faces of two ends of the rack in the length direction are provided with mounting holes, a connecting rod is in threaded connection with the mounting holes, and the limiting protruding portion is abutted to the edge of the mounting holes.

Through setting up the connecting rod, the mounting hole spiro union on connecting rod and the rack of direction machine 2, and spacing through spacing bellying, not only convenient assembly, but also can avoid the connecting rod to twist the mounting hole too deeply, guarantee the uniformity of assembly, improve assembly efficiency.

Preferably, the base 7-a comprises a base plate for connection to the subframe 1. In the present embodiment, the base plate is fixedly connected to the subframe 1 by at least four screws.

And a cylinder 7-b extends from the surface of the substrate, which deviates from the auxiliary frame 1, along the direction of keeping away from the auxiliary frame 1, and the cylinder 7-b is installed in the installation sleeve through a rotating bearing 7-c.

The base 7-a is arranged to extend out of the column 7-b on the base plate, so that the structure is simplified, the cost is reduced, and the column 7-b is arranged in the mounting sleeve through the rotating bearing 7-c, so that the normal rotation of the mounting sleeve can be ensured, and the normal operation of work is ensured.

Furthermore, the rocker arm assembly 7 further comprises a snap ring 7-d, a supporting convex part is arranged on the circumferential side wall of the first end, close to the substrate, of the cylinder 7-b, an insertion groove is arranged on the circumferential side wall of the second end, far away from the substrate, of the cylinder 7-b, the rotary bearing 7-c is located between the supporting convex part and the insertion groove, the snap ring 7-d is connected with the insertion groove in a clamping mode, interference between the installation sleeve and the substrate is avoided, meanwhile, the rotary bearing 7-c can be conveniently installed and removed, and the installation and removal efficiency is improved.

Preferably, the mounting sleeve comprises a pipe body and a cover plate 7-e, the cover plate 7-e is detachably covered on the pipe body, the cover plate 7-e protrudes towards the direction away from the base plate towards the plate surface of the base plate to form a concave part, the pipe body is sleeved on the rotating bearing 7-c, the cylinder 7-b protrudes out of the rotating bearing 7-c and is located in the concave part, and the first connecting arm 7-f and the second connecting arm 7-g are both arranged on the outer pipe wall of the pipe body.

By arranging the mounting sleeve into the tube body and the cover plate 7-e, and detachably covering the cover plate 7-e on the tube body, the mounting and dismounting of the rotary bearing can be facilitated while foreign matters are ensured to enter the mounting sleeve, and the mounting and dismounting efficiency is improved.

Further, the steering tie rod assembly 6 comprises a steering tie rod, a steering tie rod inner spherical hinge 6-a and a steering tie rod outer spherical hinge 6-b.

The ball pin of the ball hinge 6-a in the steering pull rod is fixedly arranged in the second fixing hole, the ball seat of the ball hinge 6-a in the steering pull rod is connected with the ball seat of the ball hinge 6-b outside the steering pull rod through the steering pull rod, and the ball pin of the ball hinge 6-b outside the steering pull rod is used for being fixed on the steering knuckle 5, so that the structure is simplified, and the cost is reduced.

Preferably, the steering trapezoid mechanism further comprises a first fixing nut and a second fixing nut, the ball pin of the rocker arm pull rod outer ball hinge 9-b penetrates through the first fixing hole, and the first fixing nut is screwed on the ball pin of the rocker arm pull rod outer ball hinge 9-b and is located outside the first fixing hole.

And the ball pin of the ball hinge 6-a in the steering pull rod penetrates out of the second fixing hole, and the second fixing nut is screwed on the ball pin of the ball hinge 6-a in the steering pull rod and is positioned outside the second fixing hole.

The first fixing nut is used for fixing the outer spherical hinge 9-b of the rocker arm pull rod, and the second fixing nut is used for fixing the inner spherical hinge 6-a of the steering pull rod, so that the assembly and disassembly are convenient, and the assembly and disassembly efficiency is improved.

Further, the bogie ladder mechanism further includes a sub-frame 1, a knuckle 5, a front lower arm 8, and a rear lower arm 3.

And a front lower arm inner bushing 8-a and a front lower arm outer spherical hinge 8-b are respectively arranged at two ends of the front lower arm 8 in the length direction.

And a rear lower arm inner bushing 3-a and a rear lower arm outer spherical hinge 3-b are respectively arranged at two ends of the rear lower arm 3 in the length direction.

The front lower arm inner bushing 8-a and the rear lower arm inner bushing 3-a are connected with the auxiliary frame 1 through bolts, and the ball pins of the front lower arm outer ball hinge 8-b and the rear lower arm outer ball hinge 3-b are arranged on the steering knuckle 5, so that the assembly and disassembly are convenient, and the assembly and disassembly efficiency is improved.

The application also provides an automobile, which comprises a steering gear and at least two steering trapezoidal mechanisms, wherein the steering gear 2 is respectively connected with the at least two steering trapezoidal mechanisms, and the at least two steering trapezoidal mechanisms are symmetrically arranged on two sides of the steering gear 2.

When the steering mechanism works, the rack of the steering mechanism 2 moves linearly, the rocker arm assembly 7 is driven to rotate through the rocker arm and pull rod assembly 9, the rocker arm assembly 7 drives the steering knuckle 5 to rotate through the steering and pull rod assembly 6, and steering of tires is controlled.

The application provides an automobile is through setting up rocking arm assembly and rocking arm pull rod assembly, rocking arm pull rod assembly is connected with steering gear and first fixed orifices respectively, the second fixed orifices is connected with the steering linkage assembly, the connection length of multiplicable steering linkage assembly, make the position of steering gear can the antedisplacement, not only can avoid steering gear and motor, the interference of tubular column jackshaft and semi-axis, provide the space demand for steering system's arrangement, satisfy the designing requirement of vehicle, and also be favorable to reducing the universal joint fork contained angle, be favorable to arranging the universal joint contained angle of the left and right sides equal, thereby optimize the fluctuation of steering torque, make to turn to more steadily. Simultaneously, set up the rocker arm assembly into the form of base, installation sleeve, first linking arm and second linking arm, not only increased the design hard spot of rocker arm assembly, made the adjustment of design hard spot have more design modes, can obtain more excellent ackerman steering characteristic and other and operate the steady ability, through setting up the proportion of two linking arm lengths in addition, under the condition of rotating the same tire corner, can reduce the stroke of traversing mechanism, optimize and rotate the drive ratio, guarantee the promptness that turns to.

The technical solutions of the present application are described in detail with reference to specific embodiments, which are used to help understand the ideas of the present application. The derivation and modification made by the person skilled in the art on the basis of the specific embodiment of the present application also belong to the protection scope of the present application.

Claims (10)

1. A steering ladder mechanism, comprising: rocking arm assembly and be used for the rocking arm pull rod assembly who is connected with the direction machine, the rocking arm assembly is including installation sleeve, first linking arm, second linking arm and be used for installing the base on sub vehicle frame, the installation sleeve is rotationally installed on the base, the first end of first linking arm and the first end of second linking arm are all installed on the telescopic lateral wall of installation, the second of first linking arm is held and is had first fixed orifices, rocking arm pull rod assembly and first fixed orifices are connected, the second of second linking arm is held and is had the second fixed orifices that is used for being connected with steering linkage assembly.

2. The steering trapezoid mechanism according to claim 1, wherein the rocker arm pull rod assembly comprises a rocker arm pull rod inner spherical hinge, a rocker arm pull rod outer spherical hinge and a rocker arm pull rod, two ends of the rocker arm pull rod are respectively and fixedly connected with a ball seat of the rocker arm pull rod inner spherical hinge and a ball seat of the rocker arm pull rod outer spherical hinge, a ball pin of the rocker arm pull rod inner spherical hinge is connected with the steering machine, and a ball pin of the rocker arm pull rod outer spherical hinge is installed in the first fixing hole.

3. The steering trapezoid mechanism as recited in claim 2, wherein a connecting rod is disposed on the ball seat of the ball joint in the rocker arm pull rod, the connecting rod is provided with a limiting protrusion for abutting against the edge of the mounting hole of the steering rack and an external thread for screwing with the mounting hole, and the limiting protrusion is located between the external thread and the ball seat of the ball joint in the rocker arm pull rod.

4. The steering ladder mechanism of claim 3 wherein the base includes a base plate for attachment to the subframe, the base plate extending away from the subframe in a direction away from the subframe to form a post, the post being mounted in the mounting sleeve by a pivot bearing.

5. The steering trapezoid mechanism as recited in claim 4, wherein the rocker arm assembly further comprises a snap ring, a support protrusion is disposed on a circumferential sidewall of the column body near the first end of the base plate, an insertion groove is disposed on a circumferential sidewall of the column body far from the second end of the base plate, the rotary bearing is disposed between the support protrusion and the insertion groove, and the snap ring is engaged with the insertion groove.

6. The steering trapezoid mechanism as claimed in claim 5, wherein the mounting sleeve comprises a tube and a cover plate, the cover plate is detachably covered on the tube, the cover plate protrudes towards the base plate to form a recess, the tube is covered on the rotating bearing, the post protrudes from the rotating bearing and is located in the recess, and the first connecting arm and the second connecting arm are both disposed on the outer wall of the tube.

7. The keystone mechanism of claim 6, wherein the steering linkage assembly comprises a steering linkage, an inner steering linkage ball joint, and an outer steering linkage ball joint, wherein the ball pin of the inner steering linkage ball joint is fixedly mounted in the second fixing hole, the ball seat of the inner steering linkage ball joint is connected with the ball seat of the outer steering linkage ball joint through the steering linkage, and the ball pin of the outer steering linkage ball joint is configured to be fixed to the knuckle.

8. The keystone mechanism of claim 7, further comprising a first fixing nut and a second fixing nut, wherein the ball pin of the rocker arm pull rod outer ball hinge extends through the first fixing hole, the first fixing nut is screwed to the ball pin of the rocker arm pull rod outer ball hinge and is located outside the first fixing hole, the ball pin of the steering pull rod inner ball hinge extends through the second fixing hole, and the second fixing nut is screwed to the ball pin of the steering pull rod inner ball hinge and is located outside the second fixing hole.

9. The bogie ladder mechanism according to claim 8, further comprising a sub-frame, a knuckle, a front lower arm and a rear lower arm, wherein a front lower arm inner bushing and a front lower arm outer ball joint are respectively provided at both ends in the length direction of the front lower arm, a rear lower arm inner bushing and a rear lower arm outer ball joint are respectively provided at both ends in the length direction of the rear lower arm, the front lower arm inner bushing and the rear lower arm inner bushing are both connected to the sub-frame by bolts, and ball pins of the front lower arm outer ball joint and the rear lower arm outer ball joint are mounted on the knuckle.

10. A motor vehicle comprising a steering gear and at least two steering ladder mechanisms according to any of claims 1-9, said steering gear being connected to at least two steering ladder mechanisms, respectively.

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