CN114506300A

CN114506300A - Engineering vehicle supporting leg mechanism, engineering vehicle chassis and engineering vehicle

Info

Publication number: CN114506300A
Application number: CN202210240250.7A
Authority: CN
Inventors: 王力; 马洪锋; 李根文
Original assignee: Jiangsu XCMG Construction Machinery Institute Co Ltd
Current assignee: Jiangsu XCMG Construction Machinery Institute Co Ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-05-17

Abstract

The disclosure relates to an engineering vehicle supporting leg mechanism, an engineering vehicle chassis and an engineering vehicle. Engineering vehicle landing leg mechanism includes: a telescoping leg assembly comprising at least one pair of telescoping legs; wherein, the telescopic leg includes: a telescoping arm and a leg box, the leg box disposed on a frame, the telescoping arm configured for telescoping movement within the leg box; a pitch leg assembly comprising at least one pair of pitch legs; a pitch leg provided at an end of the telescopic leg away from the frame direction, configured to perform a pitch motion in a vertical plane; and a support leg assembly comprising at least one pair of support legs; a support leg disposed at an end of the pitch leg away from the frame direction and configured to move with a pitch motion of the pitch leg.

Description

Engineering vehicle supporting leg mechanism, engineering vehicle chassis and engineering vehicle

Technical Field

The disclosure relates to the field of engineering machinery, in particular to an engineering vehicle supporting leg mechanism, an engineering vehicle chassis and an engineering vehicle.

Background

The landing leg replaces the chassis usually, and bearing complete machine weight has reduced the load of spare parts such as tire, chassis like this on the one hand, and on the other hand has increased support moment, has promoted the antidumping nature of whole car. Common structural forms of the support leg in the related art are a telescopic support leg, a swinging support leg and the like. The swing support leg is that the support leg structural member is stored at two sides of the vehicle body when not working, horizontally rotates and swings out towards two sides under the driving of the swing oil cylinder when working, and rotates to a designated position; the telescopic support legs are common, the telescopic support legs are contracted and placed in the support leg space of the vehicle body when the vehicle does not work, and the telescopic support legs are driven by the telescopic oil cylinder to extend to an appointed position during work.

Disclosure of Invention

The inventor finds that the engineering vehicle needs to run on a road, so that extremely high requirements are imposed on the weight of the vehicle and the size of the vehicle body in all directions, particularly the width of the vehicle body, a swing type support leg in some related technologies occupies the space of the width of the vehicle body, so that the structure of the vehicle body is limited, and in addition, no obstacle is required in the swing range of the support leg, and the requirements on the environment are high.

In other related technologies, due to the limitation of the cross structure form, the telescopic support legs have to be staggered one above the other to have enough space for arranging the support legs, so that at least one support leg is higher than the surface of the vehicle frame, the surface of the vehicle frame is uneven, and the arrangement and the installation of vehicle-mounted accessories are inconvenient.

In view of this, the embodiment of the present disclosure provides an engineering vehicle leg mechanism, an engineering vehicle chassis and an engineering vehicle, which can reduce the occupation of the engineering vehicle leg on the lateral space of the engineering vehicle.

In one aspect of the present disclosure, there is provided a leg mechanism for a work vehicle, including:

a telescoping leg assembly comprising at least one pair of telescoping legs;

a pitch leg assembly comprising at least one pair of pitch legs; and

a support leg assembly comprising at least one pair of support legs;

wherein, the telescopic leg includes:

a telescoping arm and a leg box, the leg box disposed on a frame, the telescoping arm configured for telescoping movement within the leg box;

the pitching supporting leg is arranged at one end of the telescopic supporting leg far away from the direction of the frame and is configured to execute pitching motion in a vertical plane; and

the supporting leg is arranged at one end of the pitching leg far away from the vehicle frame and is configured to move along with the pitching motion of the pitching leg.

In some embodiments, the pitch leg comprises:

the first end of the upper connecting rod is arranged on the telescopic supporting leg, and the second end of the upper connecting rod is arranged on the supporting leg;

the first end of the lower connecting rod is arranged on the telescopic supporting leg, and the second end of the lower connecting rod is arranged on the supporting leg; and

a pitch ram disposed between the upper link and the lower link and configured to rotate the upper link and the lower link in a vertical plane.

In some embodiments, when the engineering vehicle leg mechanism is unfolded,

the telescopic supporting legs extend out in the direction far away from the frame;

the pitching supporting legs rotate towards the direction close to the ground to drive the supporting legs to move downwards until the supporting legs are supported on the ground.

In some embodiments, when the engineering vehicle leg mechanism is retracted,

the pitching supporting legs rotate towards the direction far away from the ground;

the pitching supporting legs and the supporting legs are gradually closed to drive the supporting legs to move upwards;

the telescopic legs retract in a direction approaching the frame.

In some embodiments, a cavity is provided inside the support leg, so that when the engineering vehicle leg mechanism is folded, the pitching leg is completely folded in the cavity.

In some embodiments, the engineering vehicle leg mechanism further comprises:

the fixing seat is arranged at the joint of the telescopic supporting leg and the pitching supporting leg, and the first end of the upper connecting rod and the first end of the lower connecting rod are connected with the fixing seat through a pin shaft.

In some embodiments, a first pin at the connection position of the upper connecting rod and the fixed seat and a second pin at the connection position of the lower connecting rod and the fixed seat are both parallel to the ground, so that the supporting leg is always perpendicular to the ground in the moving process.

In some embodiments, the two adjacent leg boxes are arranged in a V-shape with respect to the frame such that the frame and the leg boxes are coplanar.

In some embodiments, the pitch ram comprises:

a cylinder body disposed at a first end of the upper link;

a piston rod disposed at a second end of the lower link.

In some embodiments, the telescoping leg further comprises:

the telescopic oil cylinder is arranged at one end, close to the frame, of the telescopic arm, the other end of the telescopic oil cylinder is arranged at the joint of the supporting leg box and the frame, and the telescopic oil cylinder is configured to enable the telescopic arm to move along the direction of the supporting leg box.

In some embodiments, the leg box is integrally formed with or welded to the frame.

In some embodiments, the holder is welded to the telescopic arm.

In another aspect of the present disclosure, there is provided a work vehicle chassis comprising:

a frame; and

the engineering vehicle support leg mechanism is connected with the frame.

In yet another aspect of the present disclosure, there is provided a work vehicle including:

such as the aforementioned work vehicle chassis.

Thus, according to the disclosed embodiments, when the work vehicle leg mechanism is fully deployed, each leg assembly provides sufficient support torque to the work vehicle; when the engineering vehicle supporting leg mechanism is completely folded, the telescopic supporting leg assembly is folded at the bottom of the vehicle frame, and the pitching supporting leg assembly and the supporting leg assembly are vertically folded at two sides of the body of the engineering vehicle. The engineering vehicle landing leg mechanism in the embodiment reduces the occupation of the transverse space of the engineering vehicle under the condition of ensuring enough supporting moment, can optimize and improve the structural form of the telescopic landing leg assembly, and is favorable for the structural optimization of a frame and the installation and the arrangement of vehicle-mounted accessories. And the required transverse space in the unfolding process of the engineering vehicle supporting leg mechanism is smaller, so that the requirement on the working environment can be reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a work vehicle leg mechanism according to some embodiments of the present disclosure;

FIG. 2 is a schematic structural view of a work vehicle leg mechanism in a deployed state according to some embodiments of the present disclosure;

fig. 3 is a schematic structural view of a folding state of a leg mechanism of an engineering vehicle according to some embodiments of the present disclosure.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

The engineering vehicle has extremely high limit to the weight and the size of the vehicle body when running on a road, and the supporting legs in some related technologies cause the vehicle to be too wide, so that the engineering vehicle is inconvenient to run on the road.

In view of this, the embodiment of the present disclosure provides an engineering vehicle leg mechanism, an engineering vehicle chassis and an engineering vehicle, which reduces the occupation of the engineering vehicle lateral space by an engineering vehicle leg.

Fig. 1 is a schematic structural diagram of a work vehicle leg mechanism according to some embodiments of the present disclosure.

Referring to fig. 1, the present disclosure provides an engineering vehicle leg mechanism, including: a telescoping leg assembly, a pitch leg assembly, and a support leg assembly. The telescopic leg assembly comprises at least one pair of telescopic legs 1, the pitch leg assembly comprises at least one pair of pitch legs 3, and the support leg assembly comprises at least one pair of support legs 4. The at least one pair of telescopic legs 1, the pitch legs 3 and the support legs 4 are arranged corresponding to the frame on two sides, that is, at least one telescopic leg 1, one pitch leg 3 and one support leg 4 are arranged on the same side of the frame.

The telescopic leg 1 comprises: a telescopic arm 11 and a leg box 12, the leg box 12 being provided on the frame 2, the telescopic arm 11 being configured to move telescopically relative to the leg box 12 within the leg box 12. The pitch leg 3 is disposed at one end of the telescopic leg 1 away from the frame 2 and configured to perform a pitch motion in a vertical plane, and the support leg 4 is disposed at one end of the pitch leg 3 away from the frame 2 and configured to move with the pitch motion of the pitch leg 3.

In this embodiment, the telescopic leg assembly can realize the movement in the horizontal direction, and the pitching leg assembly can realize the rotation in the vertical direction by using one end of the telescopic leg assembly as a base point, and drive the support leg assembly to move.

When the engineering vehicle leg mechanism is unfolded, the supporting leg assembly can be placed perpendicular to the ground, the pitching leg assembly can be rotated to be horizontal to the ground, the pitching leg assembly can also be rotated to be lower than the plane position of the vehicle frame, the pitching leg and the telescopic leg assembly form a supporting span relative to the supporting leg, and sufficient supporting force is provided for relevant operation of the vehicle body.

When the engineering vehicle supporting leg mechanism is folded, the telescopic supporting leg assembly transversely shrinks at the bottom of the frame, the pitching supporting leg assembly rotates to the vertical direction and is folded at two sides of the engineering vehicle body together with the supporting leg assembly, the maximum size of the two sides after being folded can be basically consistent with the width of the whole engineering vehicle, and the smooth road transportation of the engineering vehicle is ensured.

Therefore, the engineering vehicle supporting leg mechanism in the embodiment not only ensures enough supporting moment, but also reduces the occupation of the transverse space of the engineering vehicle, can avoid unreasonable arrangement of the engineering vehicle supporting leg mechanism and influence on the appearance, and is beneficial to the structural optimization of the frame 2 and the installation and arrangement of vehicle-mounted accessories. In addition, the unfolding space required in the unfolding process of the engineering vehicle supporting leg mechanism in the embodiment is small, and the requirement on the working environment is reduced. In practical application, the telescopic leg component, the pitching leg component and the supporting leg component with corresponding sizes can be selected and combined according to different working conditions.

Referring to fig. 1, in some embodiments, the pitch leg 3 comprises: an upper link 31, a lower link 32, and a pitch cylinder 33.

The first end 311 of the upper link is arranged on the telescopic leg 1 and the second end 312 of the upper link is arranged on the support leg 4. The first end 321 of the lower link is arranged on the telescopic leg 1 and the second end 322 of the lower link is arranged on the support leg 4. The pitch cylinder 33 is disposed between the upper link 31 and the lower link 32, and is configured to rotate the upper link 31 and the lower link 32 in a vertical plane.

In this embodiment, the upper link 31 and the lower link 32 are respectively disposed between the support leg 4 and the telescopic leg 1, and the upper link 31 and the lower link 32 are driven to rotate in a vertical plane by the telescopic motion of the pitch cylinder 33. The pitching condition of the supporting leg mechanism of the engineering vehicle can be conveniently adjusted, the stretching of the pitching oil cylinder 33 is converted into the rotation of the upper connecting rod 31 and the lower connecting rod 32, and the controllability of the posture of the supporting leg is improved.

Referring to fig. 2, in some embodiments, when the engineering vehicle leg mechanism is unfolded, the telescopic leg 1 extends away from the vehicle frame 2. The pitching supporting legs 3 rotate towards the direction close to the ground, and drive the supporting legs 4 to move downwards until the supporting legs 4 are supported on the ground.

In the embodiment, the telescopic supporting legs 1 extend outwards to a certain length, and then the pitching supporting legs 3 rotate downwards until the supporting legs 4 are supported on the ground, so that the supporting legs of the engineering vehicle are completely unfolded, sufficient supporting moment is ensured, and the anti-overturning stability of the whole vehicle is improved.

In some embodiments, when the engineering vehicle support leg mechanism is folded, the pitching support leg 3 rotates towards the direction far away from the ground to drive the support leg 4 to move upwards, the pitching support leg 3 and the support leg 4 gradually approach each other, and the telescopic support leg 1 retracts towards the direction close to the frame 2.

In this embodiment, the pitching supporting legs 3 are firstly rotated upwards until the supporting legs 4 are completely folded, and then the telescopic supporting legs 1 are retracted inwards to drive the pitching supporting legs 3 and the supporting legs 4 to move to two sides of the vehicle body, so that the supporting legs of the engineering vehicle are completely folded, and the occupied part of the supporting leg mechanism of the engineering vehicle on the transverse space of the vehicle body is converted into the utilization of the vertical space.

Referring to fig. 2 and 3, in some embodiments, the upper link 31 and the lower link 32 may be respectively pin-connected with the support legs 4. The supporting legs 4 are internally provided with cavities, and when the supporting leg mechanism of the engineering vehicle is folded, the pitching supporting legs 3 are completely folded in the cavities of the supporting legs, so that the occupation of the transverse space of the vehicle is reduced. The length of the cavity can be matched with the length of the pitch leg 3, and the space with excessive height of the vehicle is prevented from being occupied.

In this embodiment, the pitching supporting leg 3 is respectively connected with the supporting leg 4 through the upper connecting rod 31 and the lower connecting rod 32 by the pin shaft, so as to realize the movable connection with the supporting leg 4, so that the supporting leg 4 can move along with the rotation of the pitching supporting leg 3 and always keep a vertical state, thereby realizing the controllability of the posture of the supporting leg assembly of the engineering vehicle.

Referring to fig. 1, in some embodiments, the telescopic leg 1 further includes a fixing seat 5, the fixing seat 5 is disposed at a connection position of the telescopic leg 1 and the pitch leg 3, and the first end 311 of the upper link and the first end 321 of the lower link are connected to the fixing seat 5 by a pin.

In this embodiment, will telescopic leg 1 with the junction of every single move landing leg 3 sets up fixing base 5, guarantees telescopic leg 1 and the intensity of 3 junctions of every single move landing legs, reduces the load of hinge point department, increases the support basement of hoist, can realize the stable support to the automobile body.

Referring to fig. 1, in some embodiments, a first pin 61 at the connection of the upper link 31 and the fixed seat 5 and a second pin 62 at the connection of the lower link 32 and the fixed seat 5 are both parallel to the ground, so that the support leg 4 is always perpendicular to the ground during movement.

In this embodiment, the first pin 61 and the second pin 62 are arranged parallel to the ground, so that the upper link 31 and the lower link 32 are always parallel to each other in the rotation process, and the supporting leg 4 is always perpendicular to the ground, and the unfolding and folding processes of the supporting leg mechanism of the engineering vehicle are stable and controllable.

Referring to fig. 1, in some embodiments, the adjacent two leg boxes 12 are arranged in a V-shape with respect to the frame 2. In this embodiment, the two adjacent leg boxes 12 are arranged in a V shape, so that the frame 2 and the leg boxes 12 are coplanar. Therefore, the problem that the surface of the frame 2 is uneven due to the fact that supporting leg mechanisms of the engineering vehicle are not on the same plane due to the fact that the supporting leg boxes 12 are arranged in a crossed mode can be avoided, enough space is reserved under the vehicle for arranging the supporting leg mechanisms of the engineering vehicle and other vehicle-mounted accessories, installation is convenient, and support of the vehicle can be enhanced.

Referring to fig. 2, in some embodiments, the pitch cylinder 33 includes: a cylinder 331 and a piston rod 332. The cylinder 331 is disposed at the first end 311 of the upper link, and the piston rod 332 is disposed at the second end 322 of the lower link.

In this embodiment, the piston rod 332 and the cylinder 331 are respectively disposed at diagonal end points of the lower connecting rod 32 and the upper connecting rod 31, so that the piston rod 332 moves relative to the cylinder 331 to drive the upper connecting rod 31 and the lower connecting rod 32 to rotate in a vertical plane, thereby achieving reasonable utilization of a vertical space.

Referring to fig. 1, in some embodiments, the telescopic leg 1 further includes a telescopic cylinder 13, one end of the telescopic cylinder 13 is disposed at one end of the telescopic arm 11 close to the frame 2, and the other end of the telescopic cylinder 13 is disposed at a connection between the leg box 12 and the frame 2, and is configured to move the telescopic arm 11 along the direction of the leg box 12.

In this embodiment, the telescopic cylinder is disposed between the telescopic arm 11 and the leg box 12, and can drive the telescopic arm 11 to perform telescopic motion relative to the leg box 12, so as to realize the folding and unfolding of the telescopic leg 1 in the horizontal direction.

Referring to fig. 2 and 3, in some embodiments, the leg box 12 is integrally formed with the frame 2 or welded to the frame 2. In this embodiment, the leg box 12 and the frame 2 are non-detachable structures, so that the frame 2 has a flat surface for easy installation, and sufficient space can be provided for the arrangement and installation of vehicle-mounted accessories.

In some embodiments, the fixing base 5 is welded to the telescopic arm 11. In this embodiment, the fixing seat 5 and the telescopic arm 11 are welded to each other, so that the pitching supporting leg 3 and the telescopic supporting leg 1 can be connected more stably and reliably.

In another aspect of the disclosure, a chassis of a work vehicle is provided, which is characterized by comprising a frame 2 and any one of the work vehicle leg mechanisms as described above, and the work vehicle leg mechanisms are respectively connected with the frame 2. The chassis of the engineering vehicle in the embodiment provides stable and reliable support for the body of the engineering vehicle, simultaneously reduces the occupation of the transverse space and the space under the vehicle, and is beneficial to the structural optimization of the frame 2 and the installation and arrangement of vehicle-mounted accessories.

In yet another aspect of the disclosure, a work vehicle is provided comprising the work vehicle chassis described above. The engineering vehicle in the embodiment can solve the problems that the structure is not attractive and accessories are not easy to arrange due to unreasonable arrangement and overlarge occupied space of the supporting leg mechanism of the engineering vehicle. And the expansion space required in the expansion process of the engineering vehicle supporting leg mechanism is smaller, and the requirement on the working environment is reduced. Meanwhile, the supporting leg structure assembly of the engineering vehicle realizes enough supporting moment, the supporting strength of the engineering vehicle is guaranteed, and a more stable and reliable operation environment is provided for related operations.

In some embodiments, one side of the frame 2 may be provided with an engineering vehicle leg mechanism as described above, and the other side of the frame 2 is provided with a telescopic leg mechanism including multiple telescopic arms, for example, the telescopic leg mechanism including multiple telescopic arms is provided at the head end, and the engineering vehicle leg mechanism is provided at the tail end. A pair of telescopic supporting legs 1 in the telescopic supporting leg mechanism can be arranged in a V shape relative to a frame 2, so that the telescopic supporting legs 1 and the frame 2 are in the same plane. In some embodiments, a work vehicle leg mechanism as described above may also be provided on both sides of the frame 2.

The engineering vehicle in the embodiment can be a lifting truck, an overhead working truck, a hoisting operation truck and the like, and the engineering vehicle support leg mechanism comprises a support applied to various lifting equipment, hoisting equipment and overhead equipment, but is not limited to the support.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An engineering vehicle leg mechanism, comprising:

a telescopic leg assembly comprising at least one pair of telescopic legs (1);

a pitch leg assembly comprising at least one pair of pitch legs (3); and

a support leg assembly comprising at least one pair of support legs (4);

wherein the telescopic leg (1) comprises:

a telescopic arm (11) and a leg box (12), the leg box (12) being arranged on the frame (2), the telescopic arm (11) being configured for telescopic movement within the leg box (12);

the pitching supporting leg (3) is arranged at one end of the telescopic supporting leg (1) far away from the direction of the frame (2) and is configured to execute pitching motion in a vertical plane; and

the supporting leg (4) is arranged at one end of the pitching leg (3) far away from the vehicle frame (2) and is configured to move along with the pitching motion of the pitching leg (3).

2. The work vehicle leg mechanism according to claim 1, characterized in that the pitch leg (3) comprises:

an upper link (31) having a first end (311) disposed on the telescoping leg (1) and a second end (312) disposed on the support leg (4);

a lower link (32) having a first end (321) arranged on the telescopic leg (1) and a second end (322) arranged on the support leg (4); and

a pitch cylinder (33) disposed between the upper link (31) and the lower link (32), configured to rotate the upper link (31) and the lower link (32) in a vertical plane.

3. The engineering vehicle leg mechanism of claim 2, wherein during deployment,

the telescopic supporting legs (1) extend out in the direction far away from the frame (2);

the pitching supporting legs (3) rotate towards the direction close to the ground to drive the supporting legs (4) to move downwards until the supporting legs (4) are supported on the ground.

4. The engineering vehicle leg mechanism as claimed in claim 2, wherein during folding,

the pitching supporting legs (3) rotate towards the direction far away from the ground;

the pitching supporting legs (3) drive the supporting legs (4) to move towards the pitching supporting legs (3);

the telescopic supporting legs (1) retract towards the direction close to the frame (2).

5. The work vehicle leg mechanism according to claim 4, characterized in that a cavity is arranged inside the support leg (4), so that when the work vehicle leg mechanism is folded, the pitching leg (3) is completely folded in the cavity.

6. The work vehicle leg mechanism according to claim 2, characterized in that the telescopic leg (1) further comprises:

fixing base (5), fixing base (5) set up flexible landing leg (1) with the junction of every single move landing leg (3), first end (311) of going up the connecting rod with first end (321) of lower connecting rod with fixing base (5) round pin hub connection.

7. The engineering vehicle leg mechanism as claimed in claim 6, wherein a first pin (61) at the connection of the upper link (31) and the fixed seat (5) and a second pin (62) at the connection of the lower link (32) and the fixed seat (5) are both parallel to the ground, so that the supporting leg (4) is always perpendicular to the ground during movement.

8. The engineering vehicle leg mechanism of claim 1,

the two adjacent leg boxes (12) are arranged in a V shape relative to the frame (2) so that the frame (2) and the leg boxes (12) are coplanar.

9. The work vehicle leg mechanism according to claim 2, characterized in that the pitch cylinder (33) comprises:

a cylinder (331), the cylinder (331) disposed at a first end (311) of the upper link;

a piston rod (332), the piston rod (332) disposed at the second end (322) of the lower link.

10. The work vehicle leg mechanism according to claim 1, characterized in that the telescopic leg (1) further comprises:

the telescopic oil cylinder (13), the one end setting of telescopic oil cylinder (13) is in telescopic arm (11) is close to the one end of frame (2), the other end setting of telescopic oil cylinder (13) is in landing leg case (12) with the junction of frame (2) is configured to the messenger telescopic arm (11) are followed the direction of landing leg case (12) is removed.

11. The work vehicle leg arrangement according to claim 1, characterized in that the leg box (12) is integrally formed with the frame (2) or welded thereto.

12. The work vehicle leg mechanism according to claim 6, characterized in that the fixing base (5) is welded to the telescopic arm (11).

13. A work vehicle chassis, comprising:

a frame (2);

a work vehicle leg unit according to any of claims 1-12, connected to the frame (2).

14. A work vehicle, comprising:

the work vehicle chassis as claimed in claim 13.