Patent Publication Number: US-2022213665-A1

Title: Wheeled engineering vehicle for improving operation efficiency

Description:
RELATED APPLICATION 
     The present application is based on and claims the priority of CN Application No. 202011084837.0, filed on Oct. 12, 2020, the disclosure of which is incorporated herein in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the field of engineering machinery, in particular to a wheeled engineering vehicle for improving operation efficiency. 
     BACKGROUND 
     A backhoe loader is a multi-functional wheeled engineering vehicle integrating excavation and loading together. In order to meet the needs of excavation operating conditions and operation safety, the backhoe loader must be in rigid contact with the ground so as to prevent the whole vehicle from swaying. Therefore, it needs a support device that props up the whole vehicle and lifts tires off the ground. The inventor found that wheeled engineering vehicles in related arts have the problem of poor stability when being supported by the support device. 
     SUMMARY 
     Some embodiments of the present disclosure provide a wheeled engineering vehicle for improving operation efficiency, including: 
     a frame; 
     a first telescopic cylinder disposed on the frame; and 
     a stabilizer assembly connected with the first telescopic cylinder and configured to rotate relative to the frame under a drive of the first telescopic cylinder, the stabilizer assembly including: 
     a first stabilizer leg constructed to be of a hollow structure, of which a first end is articulated with the frame, and of which a second end is a free end; 
     a second telescopic cylinder disposed in the first stabilizer leg; 
     a second stabilizer leg, of which a first end in a telescoping direction is located in the first stabilizer leg and connected to the second telescopic cylinder, and of which a second end in the telescoping direction is located outside the first stabilizer leg via the second end of the first stabilizer leg, the second stabilizer leg being configured to extend or retract relative to the first stabilizer leg under a drive of the second telescopic cylinder, and the first stabilizer leg being configured to radially limit the second stabilizer leg; and 
     a stabilizer foot connected to the second end of the second stabilizer leg and configured to be in contact with the ground to support the wheeled engineering vehicle. 
     In some embodiments, the second stabilizer leg and the second telescopic cylinder are rotatably connected. 
     In some embodiments, the stabilizer assembly includes a bearing, through which the second stabilizer leg is connected to the second telescopic cylinder. 
     In some embodiments, the stabilizer assembly further includes a first supporting member, which is disposed in the first stabilizer leg and is in clearance fit with a part of the second stabilizer leg located inside the first stabilizer leg. 
     In some embodiments, the first supporting member includes a shaft sleeve. 
     In some embodiments, a first end of the first telescopic cylinder is articulated with the frame, and a second end of the first telescopic cylinder is articulated with the first stabilizer leg. 
     In some embodiments, the first telescopic cylinder is articulated with the second end of the first stabilizer leg. 
     In some embodiments, the stabilizer foot is rotatably connected to the second end of the second stabilizer leg. 
     In some embodiments, the stabilizer foot is provided with at least two second supporting members, and the stabilizer foot is configured to be rotatable so that one of the at least two second supporting members contacts the ground for supporting. 
     In some embodiments, at least one of the at least two second supporting members is different from the other second supporting members in structure. 
     In some embodiments, the second supporting member includes a resilient member, a toothed member, or a hooked member. 
     In some embodiments, the stabilizer assembly further includes a positioning structure, which is configured to lock the stabilizer foot and the second stabilizer leg when the stabilizer foot rotates to cause one of the second supporting members supports the ground. 
     In some embodiments, the positioning structure includes a positioning member, at least two first positioning holes formed in the stabilizer foot, and a second positioning hole formed in the second stabilizer leg; one of the at least two first positioning holes being aligned with the second positioning hole when one of the second supporting members supports the ground, and the positioning member being configured to be inserted into the first positioning hole and the second positioning hole to lock the stabilizer foot and the second stabilizer leg. 
     In some embodiments, the wheeled engineering vehicle includes an excavating side, and the stabilizer assembly is disposed at the excavating side. 
     Based on the above-mentioned technical solutions, the present disclosure at least has the following beneficial effects: 
     In some embodiments, the stabilizer assembly can be folded on lateral parts of a chassis under the drive of the first telescopic cylinder, and the stabilizer assembly can be unfolded relative to the chassis under the drive of the first telescopic cylinder to support the whole vehicle. The second stabilizer leg of the stabilizer assembly can extend relative to the first stabilizer leg under the drive of the second telescopic cylinder to achieve a larger support span, or the second stabilizer leg retracts relative to the first stabilizer leg under the drive of the second telescopic cylinder, so as to be suitable for different ground operating conditions. The first stabilizer leg is used to protect the second telescopic cylinder and to guide the extension and retraction of the second stabilizer leg. The first stabilizer leg and the second stabilizer leg cooperate to support the whole vehicle, which improves the stability of the whole vehicle. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings illustrated herein are used to provide further understanding of the present disclosure and constitute a part of the present application, and the illustrative embodiments of the present disclosure and the illustration thereof are used to interpret the present disclosure, but do not constitute improper limitations to the present disclosure. In the drawings: 
         FIG. 1  is a schematic diagram of a backhoe loader provided according to some embodiments of the present disclosure; 
         FIG. 2  is a schematic diagram of a support device for a wheeled engineering vehicle provided according to some embodiments of the present disclosure; 
         FIG. 3  is a schematic diagram of a first stabilizer leg and a second stabilizer leg provided according to some embodiments of the present disclosure; and 
         FIG. 4  is a schematic diagram of a stabilizer foot provided according to some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The technical solutions in the embodiments will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Apparently, the embodiments described are merely part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts fall within the protection scope of the present disclosure. 
     In the description of the present disclosure, it should be understood that the directional or positional relationships indicated by terms “center”, “longitudinal”, “lateral”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, etc. are directional or positional relationships shown based on the drawings, which are merely for facilitating the description of the present disclosure and simplification of the description, instead of indicating or implying that the referred devices or elements must have specific directions or be constructed and operated in specific directions, and thus cannot be construed as limitations to the protection scope of the present disclosure. 
     Some embodiments of the present disclosure provide a wheeled engineering vehicle for improving operation efficiency, which is used for alleviating the problem of poor stability. 
     Referring to  FIG. 1 , the backhoe loader includes an excavating side  20  and a loading side  30 . Wherein, the excavating side  20  includes an excavating arm and excavator bucket for excavation, and the loading side  30  includes a loading arm and scraper bucket for loading. The backhoe loader is required to be in rigid contact with the ground when performing excavation work, so as to avoid swaying of the whole vehicle. Therefore, the backhoe loader is provided with a support device, and the support device supports the ground to prop up the whole vehicle and lift tires off the ground. 
     The support device generally includes stabilizer legs disposed on two sides of the excavating side  20 . In order to meet the excavating operation requirements of complex ground operating conditions, especially the construction operation requirements of uneven field operating conditions, the requirements on the stability of the whole vehicle is very high, so it is necessary to increase the support span and support height of two stabilizer legs as much as possible. 
     Based on this, as shown in  FIG. 2 , some embodiments of the present disclosure provide a wheeled engineering vehicle for improving operation efficiency. The wheeled engineering vehicle includes the support device, and the support device is disposed to improve the stability of supporting the wheeled engineering vehicle. Wherein, the support device includes a frame  1 , a first telescopic cylinder  2  and a stabilizer assembly  3 . 
     The frame  1  is configured to be disposed on a chassis of the wheeled engineering vehicle, or the frame  1  is configured to be integrated with the chassis of the wheeled engineering vehicle. 
     The first telescopic cylinder  2  is disposed on the frame  1 . The stabilizer assembly  3  is connected with the first telescopic cylinder  2  in a driven manner, and is configured to rotate relative to the frame  1  under the drive of the first telescopic cylinder  2 . When the first telescopic cylinder  2  drives the stabilizer assembly  3  to rotate upwards relative to the frame  1  and to be folded on lateral parts of the chassis, the stabilizer assembly  3  will not exceed the size range of the whole vehicle. When the first telescopic cylinder  2  drives the stabilizer assembly  3  to rotate downwards relative to the frame  1  to contact the ground, the stabilizer assembly  3  is used to support the wheeled engineering vehicle, so as to prop up the whole vehicle and lift tires of the wheeled engineering vehicle off the ground. 
     As shown in  FIG. 3 , the stabilizer assembly  3  includes a first stabilizer leg  31 . The first stabilizer leg  31  is configured to be of a hollow structure, a first end of the first stabilizer leg  31  is articulated with the frame  1 , and a second end of the first stabilizer leg  31  is a free end. 
     The stabilizer assembly  3  further includes a second telescopic cylinder  32  disposed in the first stabilizer leg  31 . 
     The stabilizer assembly  3  further includes a second stabilizer leg  34 . The second stabilizer leg  34  includes a first end and a second end  341  in a telescoping direction thereof, and the first end and the second end  341  of the second stabilizer leg  34  are two opposite ends. The first end of the second stabilizer leg  34  is located in the first stabilizer leg  31  and connected to the second telescopic cylinder  32 , and the second end  341  of the second stabilizer leg  34  is located outside the first stabilizer leg  31  via the second end of the first stabilizer leg  31 . 
     The second telescopic cylinder  32  is connected to the first stabilizer leg  31  and the second stabilizer leg  34 . The second stabilizer leg  34  is configured to extend or retract relative to the first stabilizer leg  31  under a drive of the second telescopic cylinder  32 , and the first stabilizer leg  31  is constructed to radially limit the second stabilizer leg  34 . 
     The stabilizer assembly  3  further includes a stabilizer foot  36 . The stabilizer foot  36  is connected to the second end  341  of the second stabilizer leg  34  and configured to be in contact with the ground to support the wheeled engineering vehicle. The stabilizer foot  36  is adapted to improve the stability of supporting the whole vehicle. 
     The stabilizer assembly  3  can be folded on the lateral parts of the chassis under the drive of first telescopic cylinder  2 , and the stabilizer assembly  3  can be unfolded relative to the chassis under the drive of the first telescopic cylinder  2  to support the whole vehicle. The second stabilizer leg  34  of the stabilizer assembly  3  can extend relative to the first stabilizer leg  31  under the drive of the second telescopic cylinder  32  to achieve a larger support span, or the second stabilizer leg  34  retracts relative to the first stabilizer leg  31  under the drive of the second telescopic cylinder  32 , so as to be suitable for different ground operating conditions. Under the drive of the second telescopic cylinder  32 , the second stabilizer leg  34  extends or retracts freely, so that the stabilizer assembly  3  has an enough support span. During construction operation, the operation stability of the whole vehicle is relatively good, very good stability can be achieved without supporting of the scraper bucket of the loading side, and construction operation efficiency is greatly improved. 
     The second stabilizer leg  34  is configured to extend or retract relative to the first stabilizer leg  31  under the drive of the second telescopic cylinder  32 , and the first stabilizer leg  31  is constructed to radially limit the second stabilizer leg  34 . The radial force on the second stabilizer leg  34  is transmitted to the first stabilizer leg  31 , and then is transmitted to the frame  1  through the first stabilizer leg  31  to prevent a radial force or bending moment generated on the second telescopic cylinder  32  from causing deformation of the second telescopic cylinder  32 . Therefore, normal work of the second telescopic cylinder  32  is facilitated, and the service life of the second telescopic cylinder  32  is prolonged. The first stabilizer leg  31  is adapted to protect the second telescopic cylinder  32 , and guide extension and retraction of the second stabilizer leg  34 . The first stabilizer leg  31  has a main support function. The first stabilizer leg  31  and the second stabilizer leg  34  cooperate to support the whole vehicle, which improves stability of the whole vehicle. 
     In some embodiments, the second stabilizer leg  34  and the second telescopic cylinder  32  are rotatably connected. 
     The second stabilizer leg  34  can extend or retract relative to the first stabilizer leg  31  under the drive of the second telescopic cylinder  32  to achieve different support spans. Moreover, the second stabilizer leg  34  is rotatable relative to the second telescopic cylinder  32 , so that the second stabilizer leg  34  can meet operating conditions of any angle, and the stabilizer foot  36  is kept in full contact with the ground at all times, which improves the stability of supporting the vehicle and the operation efficiency during the construction operation. 
     In some embodiments, the stabilizer assembly  3  includes a bearing  33 . The second stabilizer leg  34  is connected to the second telescopic cylinder  32  through the bearing  33  to achieve rotation of the second stabilizer leg  34  relative to the second telescopic cylinder  32 . 
     Optionally, the bearing  33  includes a thrust bearing. 
     In some embodiments, the stabilizer assembly  3  further includes a first supporting member  35 . The first supporting member  35  is disposed in the first stabilizer leg  31 , and the first supporting member  35  is in clearance fit with the part of the second stabilizer leg  34  located inside the first stabilizer leg  31 . The first supporting member  35  is adapted to support the second stabilizer leg  34  to prevent the second stabilizer leg  34  from swaying when the second stabilizer leg  34  extends or retracts relative to the first stabilizer leg  31 . In addition, when the second stabilizer leg  34  is subjected to an acting force such as a bending moment or a radial force or the like, the acting force is transmitted to the first stabilizer leg  31  through the first supporting member  35 , so as to avoid generating an acting force on the second telescopic cylinder  32 , avoid damage to the telescopic cylinder  32 , and prolong the service life of the second telescopic cylinder  32 . 
     In some embodiments, the first supporting member  35  includes an annular supporting member, for example, the first supporting member  35  includes a shaft sleeve. The annular supporting member is disposed in the first stabilizer leg  31 , and the second stabilizer leg  34  passes through the annular supporting member to be connected to the second telescopic cylinder  32 . 
     Optionally, two or more annular supporting members are disposed in the first stabilizer leg  31 , and the two or more annular supporting members are spaced in a length direction of the second stabilizer leg  34 . 
     Optionally, the first supporting member  35  includes supporting blocks. Two or more supporting blocks are disposed in the first stabilizer leg  31 , and the two or more supporting blocks are circumferentially disposed around the second stabilizer leg  34 . 
     The first supporting member  35  is disposed in the first stabilizer leg  31 , the first supporting member  35  is in clearance fit with the second stabilizer leg  34 , and the second stabilizer leg  34  and the second telescopic cylinder  32  are connected by the bearing  33  to realize two degrees of freedom of motion of the second stabilizer leg  34 , i.e., extension and retraction, and rotation. 
     In some embodiments, the first end of the first telescopic cylinder  2  is articulated with the frame  1 , and the second end of the first telescopic cylinder  2  is articulated with the first stabilizer leg  31 . 
     In some embodiments, the part at which the first telescopic cylinder  2  is articulated with the first stabilizer leg  31  is located at a part of the first stabilizer leg  31  away from the frame  1  to improve the stability of rotation of the first stabilizer leg  31  relative to the frame  1 . 
     In some embodiments, the first telescopic cylinder  2  is articulated with the second end of the first stabilizer leg  31 . Optionally, the outer wall of the second end of the first stabilizer leg  31  is provided with a connector  311 , and the first telescopic cylinder  2  is articulated with the connector  311 . 
     In some embodiments, the first telescopic cylinder  2  includes a hydraulic cylinder or an air cylinder. 
     The first telescopic cylinder  2 , the stabilizer assembly  3  and the frame  1  form a triangular motion mechanism. With the telescoping of the first telescopic cylinder  2 , the stabilizer assembly  3  moves in an arc-shaped track, contacts the ground when the stabilizer assembly  3  moves downwards, and thus can prop up the whole vehicle. 
     In some embodiments, the first end of the second telescopic cylinder  32  is articulated with the inner wall of the first end of the first stabilizer leg  31 , and the second end of the second telescopic cylinder  32  is articulated with the first end of the second stabilizer leg  34 . 
     In some embodiments, the second telescopic cylinder  32  includes an oil cylinder or an air cylinder. 
     In some embodiments, as shown in  FIG. 2 , the stabilizer foot  36  is rotatably disposed at the second end  341  of the second stabilizer leg  34 . The stabilizer foot  36  is provided with at least two supporting faces, and the stabilizer foot  36  is configured to rotate so that one of the at least two second supporting faces contacts the ground for supporting. The supporting face is provided with a second supporting member  37 . 
     Optionally, the stabilizer foot  36  is articulated with the second end  341  of the second stabilizer leg  34  through a pin roll, and the stabilizer foot  36  is rotatable relative to the second stabilizer leg  34 . 
     In some embodiments, the stabilizer foot  36  is provided with at least two second supporting members  37 , and the stabilizer foot  36  is configured to rotate so that one of the at least two second supporting members  37  contacts the ground for supporting. One second supporting member  37  is disposed on each of the supporting faces. 
     In some embodiments, as shown in  FIG. 4 , at least one of the at least two second supporting members  37  is different from the other second supporting members  37  in structure. 
     In some embodiments, the second supporting member  37  includes a resilient member  371  made of a resilient material. 
     For a cement road surface with a good surface or a place with high road surface requirements, in order to avoid damage to the road surface due to the stabilizer foot  36 , one of the supporting faces of the stabilizer foot  36  is provided with a resilient member  371 , and the resilient member  371  supports the ground to avoid damage to the ground. 
     Optionally, the resilient member  371  includes a rubber pad. 
     In some embodiments, the second supporting member  37  includes a toothed member  372 . Optionally, the toothed member  372  is made of steel. 
     For an earth road surface or a place with low road surface requirements, one of the supporting faces of the stabilizer foot  36  is provided with the toothed member  372 . Grip force and friction are increased through the toothed member  372 , and a good anti-slip function is achieved to a hard earth road surface. 
     Optionally, the toothed member  372  includes a rack disposed on the supporting face, or a toothed structure is integrally formed on the supporting face. 
     In some embodiments, the second supporting member  37  includes a hooked member  373 . Optionally, the hooked member  373  is made of steel. 
     During soft ground construction of farms, forest farms, construction sites and the like, for example, when conventional deep soil excavation is performed, the whole vehicle will slip under the action of an excavation reaction force, which will seriously affect operation stability and construction work efficiency. One of the supporting faces of the stabilizer foot  36  is provided with the hooked member  373 , and the hooked member  373  can be inserted into soil when the stabilizer foot  36  performs supporting, so as to stabilize the second stabilizer leg  34  and alleviate the problem of insufficient grip force. When the second stabilizer leg  34  is retracted, it is convenient to pull out the hooked member  373 , and the operation is simple and convenient. 
     Optionally, the hooked member  373  includes two or more bending plates. The bending plates bend towards a direction close to the chassis when inserting into the soil, and can be fixed on the ground through gripping the ground. 
     In some embodiments, the stabilizer assembly  3  further includes a positioning structure, which is configured to lock the stabilizer foot  36  and the second stabilizer leg  34  when the stabilizer foot  36  rotates so that one of the second supporting members  37  supports the ground. The stabilizer foot  36  will not rotate substantially relative to the second stabilizer leg  34 . At this time, the stabilizer foot  36  cannot be rotated to select a supporting face, but the stabilizer foot  36  can rotate slightly relative to the second stabilizer leg  34  to be suitable for uneven ground. 
     In some embodiments, the positioning structure includes a positioning member  381 , at least two first positioning holes  382  formed in the stabilizer foot  36 , and a second positioning hole  383  formed in the second stabilizer leg  34 . One of the at least two first positioning holes  382  is aligned with the second positioning hole  383  when one of the second supporting members  37  supports the ground, and the positioning member  381  is configured to be inserted into the first positioning hole  382  and the second positioning hole  383  to lock the stabilizer foot  36  and the second stabilizer leg  34 . 
     In some embodiments, the second end  341  of the second stabilizer leg  34  is articulated with the stabilizer foot  36  through an articulated shaft, and the part at which the second stabilizer leg  34  is articulated with the stabilizer foot  36  is located in an axial direction of the second stabilizer leg  34 . The second positioning hole  383  formed in the second end  341  of the second stabilizer leg  34  deviates from the axial direction of the second stabilizer leg  34 . 
     In some embodiments, as shown in  FIG. 3 , the second end  341  of the second stabilizer leg  34  is constructed to be in a bent shape, the bent part of the second end  341  is articulated with the stabilizer foot  36  through a pin roll, and the part at which the second stabilizer leg  34  is articulated with the stabilizer foot  36  is located in the axial direction of the second stabilizer leg  34 . The second positioning hole  383  is formed in a bent end portion of the second end  341 , and the second positioning hole  383  deviates from the axial direction of the second stabilizer leg  34 . After the positioning member  381  is inserted to connect and position the  36  and the second stabilizer leg  34 , the stabilizer foot  36  can rotate slightly relative to the second stabilizer leg  34  to adjust the angle so as to be suitable for uneven ground. 
     The stabilizer foot  36  is articulated with the second stabilizer leg  34 . Although the stabilizer foot  36  and the second stabilizer leg  34  are positioned by the positioning member  381 , the stabilizer foot  36  can still rotate slightly relative to the second stabilizer leg  34 . During the supporting process of the second stabilizer leg  34 , it can avoid that the stabilizer foot  36  is not parallel to the ground when the vehicle is tilted back and forth due to different ground angles. In addition, even if an angle change is formed between the second stabilizer leg  34  and the ground, since the second stabilizer leg  34  is rotatable relative to the first stabilizer leg  31 , the stabilizer foot  36  can rotate slightly relative to the second stabilizer leg  34 , which can also ensure that the stabilizer foot  36  is dynamically parallel to the ground in the left and right directions, which increases the contact area, effectively deals with the angle change in the vehicle operation process, ensures that the stabilizer foot  36  is parallel to the ground, and improves the stability. 
     In some embodiments, the stabilizer foot  36  is provided with at least two second supporting members  37  with different structures, which can be quickly and flexibly switched for different operating conditions, and especially for soft ground construction, slipping or tilting of the whole vehicle due to insufficient grip force of the stabilizer foot  36  can be avoided, thereby greatly improving the operation stability and construction work efficiency of the whole vehicle. 
     By rotating the stabilizer foot  36 , after the corresponding second supporting member  37  is selected, the stabilizer foot  36  and the second stabilizer leg  34  are connected and positioned by the positioning member  381 , and the stabilizer foot  36  can rotate slightly relative to the second stabilizer leg  34 , so as to be suitable for ground with different flatness, thereby effectively improving the efficiency and effect of operation and construction. 
     In some embodiments, each of the two sides of the frame  1  is provided with the first telescopic cylinder  2  and the stabilizer assembly  3 , that is, each of the two sides of the excavating side of the wheeled engineering vehicle is provided with the first telescopic cylinder  2  and the stabilizer assembly  3  to steadily support the whole vehicle. 
     In some embodiments, the stabilizer assembly  3  is driven by the first telescopic cylinder  2 , can rotate upwards relative to the frame  1  to be folded on lateral parts of the chassis, and can rotate downwards relative to the frame  1  to contact the ground so as to support the wheeled engineering vehicle. The second stabilizer leg  34  is driven by the second telescopic cylinder  32  to extend or retract relative to the frame  1  to adjust different support spans. The second stabilizer leg  34  can rotate relative to the first stabilizer leg  31  to perform adaptive adjustment according to the flatness of the ground, so that the stabilizer foot  36  is kept in full contact with the ground at all times. 
     The second stabilizer leg  34  can extend or retract relative to the first stabilizer leg  31  and is rotatable, and the stabilizer foot  36  is rotatable relative to the second stabilizer leg  34  to select the corresponding second supporting member  37  to support the ground. Moreover, after the stabilizer foot  36  and the second stabilizer leg  34  are connected and positioned by the positioning member  381 , the stabilizer foot  36  can be adjusted in a small angle range relative to the second stabilizer leg  34 . Through rotation of the second stabilizer leg  34  and circumferential rotation of the stabilizer foot  36  itself at a certain angle, stable contact support between the stabilizer foot  36  and the ground can be facilitated under any ground flatness. 
     The stabilizer foot  36  is provided with at least two types of second supporting members  37 , which can be alternatively used by rotating the stabilizer foot  36 . The operation is convenient, and different functions can be switched to be suitable for ground with different operating conditions. 
     Some specific embodiments of the wheeled engineering vehicle will be described below in conjunction with  FIGS. 2-4 . 
     As shown in  FIG. 2 , the support device of the wheeled engineering vehicle includes the frame  1 , the first telescopic cylinder  2  and the stabilizer assembly  3 . The frame  1  is disposed on the chassis of the wheeled engineering vehicle optionally, or the frame  1  is a part of the chassis of the wheeled engineering vehicle. 
     Each of the two sides of the frame  1  is provided with the first telescopic cylinder  2  and the stabilizer assembly  3 . The first end of the first telescopic cylinder  2  is articulated with the frame  1 , and the second end of the first telescopic cylinder  2  is articulated with the stabilizer assembly  3 . The first end of the stabilizer assembly  3  is articulated with the frame  1 , and the second end of the stabilizer assembly  3  is used to support the ground. The part at which the first telescopic cylinder  2  is articulated with the stabilizer assembly  3  is located between the first and second ends of the stabilizer assembly  3 . 
     As shown in  FIGS. 2 and 3 , the stabilizer assembly  3  includes the first stabilizer leg  31 , the second telescopic cylinder  32 , the bearing  33 , the second stabilizer leg  34  and the first supporting member  35 . 
     The first stabilizer leg  31  is of a hollow structure, similar to a sleeve. The first end of the first stabilizer leg  31  is a closed end and is articulated with the frame  1 . The second end of the first stabilizer leg  31  is an open end and is a free end. 
     The second telescopic cylinder  32  is located in the first stabilizer leg  31 , the first end of the second telescopic cylinder  32  is articulated with the inner wall of the first end of the first stabilizer leg  31 . The second end of the second telescopic cylinder  32  is articulated with the first end of the second stabilizer leg  34  through the bearing  33 . 
     The first end of the second stabilizer leg  34  is located in the first stabilizer leg  31 . At least two first supporting members  35  are disposed in the first stabilizer leg  31 . The first support member  35  is a shaft sleeve and is in clearance fit with the second stabilizer leg  34  to ensure that the second stabilizer leg  34  can achieve circumferential rotation and axial movement, thereby avoiding swaying of the second stabilizer leg  34 . In addition, the first support  35  can transmit the acting force of the second stabilizer leg  34  to the first stabilizer leg  31 , thereby avoiding deformation of the second telescopic cylinder  32  due to the force. The second end  31  of the second stabilizer leg  34  extends from the open end of the first stabilizer leg  31  and is located outside the first stabilizer leg  31  to connect the stabilizer foot  36 . 
     The outer wall of the first stabilizer leg  31  is provided with a connector  341 , the connector  341  is located at the second end of the first stabilizer leg  31 , and the second end of the first telescopic cylinder  2  is articulated with the connector  341 . 
     As shown in  FIGS. 2 and 4 , the stabilizer assembly  3  further includes the stabilizer foot  36 , the supporting member  37  and the positioning member  381 . 
     The stabilizer foot  36  is articulated with the second stabilizer leg  34  through a pin roll. The stabilizer foot  36  can rotate around the second stabilizer leg  34 , which ensures that the stabilizer foot  36  is completely parallel to the ground, in the course that the second stabilizer leg  34  supports the ground, thereby effectively improving the grip force and stability, and avoiding ground damage caused by uneven stress. 
     The stabilizer foot  36  is provided with three supporting faces. One of the three supporting faces is provided with a resilient member  371 , another supporting face of the three supporting faces is provided with a hooked member  373 , and the rest supporting face of the three supporting faces is provided with a toothed member  372 , which can deal with various operating conditions, especially for soft ground. The operation stability and operation efficiency of the whole vehicle are greatly improved. 
     Three first positioning holes  382  are formed in the stabilizer foot  36 , and one second positioning hole  383  is formed in the second end  341  of the second stabilizer leg  34 . The stabilizer foot  36  is rotated to select one of the three supporting faces to support the ground, so that one of the three first positioning holes  382  in the stabilizer foot  36  is aligned with the second positioning hole  383  in the second stabilizer leg  34 . At this time, the positioning member  381  is inserted to connect and position the stabilizer foot  36  and the second stabilizer leg  34 , so that the second supporting member  37  on the supporting plate  36  contacts the ground for supporting. 
     The second end  341  of the second stabilizer leg  34  is constructed to be in a bent shape, and the bent part of the second end  341  is articulated with the stabilizer foot  36  through a pin roll. The second positioning hole  383  is formed in a bent end portion of the second end  341 . By setting the second end  341  of the second stabilizer leg  34  into a bent shape, when the positioning member  381  is inserted, the stabilizer foot  38  can rotate within a certain angle range relative to the second stabilizer leg  34 , so as to meet the change of the angle between the stabilizer leg and the ground in the supporting process. 
     In some embodiments, the stabilizer assembly  3  can realize three degrees of freedom of motion. First, the stabilizer assembly  3  can rotate axially around a vehicle body; second, the second stabilizer leg  34  can freely extend or retract; and third, the stabilizer foot  36  can passively rotate around the second stabilizer leg  34  and match the multi-functional stabilizer foot  36 , which can greatly improve the stability of the excavating operation, and improve operation safety and construction efficiency. 
     In some embodiments, the wheeled engineering vehicle includes the excavating side  20 , and the stabilizer assembly  3  is disposed at the excavating side  20 . 
     As shown in  FIG. 1 , the wheeled engineering vehicle is a backhoe loader, which includes the excavating side  20  and the loading side  30 . The stabilizer assembly  3  is disposed at the excavating side  20 , and supports the whole backhoe loader to lift tires of the backhoe loader off the ground. 
     Each of the two sides of the chassis of the backhoe loader is provided with the first telescopic cylinder  2  and the stabilizer assembly  3 . 
     In the description of the present disclosure, it should be understood that the words such as “first”, “second” and “third” are used to define components and parts, which is only for the convenience of distinguishing the above-mentioned components and parts. Unless otherwise stated, the above-mentioned words have no special meaning, and thus cannot be understood as limitations to the protection scope of the present disclosure. 
     In addition, the technical features of one of the embodiments can be beneficially combined with the other one or more embodiments without explicit negation. 
     Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, instead of limiting the same. Although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand that the specific embodiments of the present disclosure can be modified or a part of the technical features can be equivalently substituted without departing from the spirit of the technical solutions of the present disclosure, and all the modification and substitution should be compassed in the scope of the technical solutions claimed by the present disclosure.