CN219989340U

CN219989340U - Combined front beam

Info

Publication number: CN219989340U
Application number: CN202321487629.4U
Authority: CN
Inventors: 张能忠; 贺高峰; 戴陈进
Original assignee: Anhui Weidu Holding Co ltd
Current assignee: Anhui Weidu Holding Co ltd
Priority date: 2023-06-12
Filing date: 2023-06-12
Publication date: 2023-11-10
Anticipated expiration: 2033-06-12

Abstract

The utility model relates to the technical field of vehicles, and particularly discloses a combined front beam, which comprises an upper bracket and a lower bracket. The upper bracket comprises a first mounting part, a second mounting part and a transition part, wherein the first mounting part is provided with a frame mounting structure and a cab mounting structure, the transition part is provided with a head beam mounting structure and a wheel cover mounting structure, and the second mounting part is provided with a closed beam mounting structure, a traction hook mounting structure, a storage battery mounting structure and a mud guard mounting structure; the lower support is detachably and fixedly connected with the upper support, and is provided with a condenser mounting structure and a front lower protection cross beam mounting structure. Through with preceding flange split for upper bracket and lower carriage two parts, reduced preceding flange integrated into one piece's processing degree of difficulty, be connected upper bracket and lower carriage detachably, convenient to detach and installation set up multiple mounting structure at upper bracket and lower carriage, satisfy the installation demand of each system component of vehicle, the integrated level is high.

Description

Combined front beam

Technical Field

The utility model relates to the technical field of vehicles, in particular to a combined front beam.

Background

The front end of the vehicle is provided with a front connecting beam, and the main functions of the front connecting beam comprise two aspects: on the one hand, the front-end system component is provided with a mounting interface, and on the other hand, the front-end lower protection device is used as a component part of the front-end lower protection device to provide support for realizing passive safety of the vehicle. Currently, the front girder on the market has the following problems: the structure is complex, the weight is heavy, the whole volume is large, the processing of parts is inconvenient, and the disassembly and the installation are difficult.

Disclosure of Invention

The utility model aims at: the combined front connecting beam is provided to solve the problems of high processing difficulty, difficult disassembly and installation caused by complex structure and large whole volume of the existing front connecting beam.

To achieve the purpose, the utility model adopts the following technical scheme:

a modular front girder comprising:

the upper bracket comprises a first mounting part, a second mounting part and a transition part, wherein the first mounting part and the second mounting part are distributed at intervals along a first direction and a second direction, the first direction is perpendicular to the second direction, the first mounting part and the second mounting part are connected through the transition part, the first mounting part is provided with a frame mounting structure and a cab mounting structure, the transition part is provided with a head beam mounting structure and a wheel cover mounting structure, and the second mounting part is provided with a closed beam mounting structure, a traction hook mounting structure, a storage battery mounting structure and a mud guard mounting structure;

the lower support, the lower support with upper bracket detachably fixed connection, the lower support is provided with condenser mounting structure and preceding lower protection crossbeam mounting structure.

As the preferred technical scheme of the preceding girder of combination formula, the bottom of second installation department is followed the first direction interval is provided with a plurality of lower carriage mounting holes, the axis direction of lower carriage mounting hole is on a parallel with the third direction, the third direction with first direction with the second direction is all perpendicular, the top of lower carriage is followed the first direction interval is provided with upper bracket mounting end ear, upper bracket mounting end ear has been seted up along the upper bracket mounting hole of third direction extension, the fastener passes through the lower carriage mounting hole with upper bracket mounting hole will the lower carriage with upper bracket detachably fixed connection.

As the preferred technical scheme of combination formula front flange, condenser mounting structure includes the condenser mounting panel, the condenser mounting panel set up in the bottom of lower carriage, and follow the outside extension of third direction, set up on the condenser mounting panel along the condenser mounting hole that the second direction extends.

As the preferred technical scheme of the preceding flange of combination, preceding lower protection crossbeam mounting structure includes two edges the preceding lower protection crossbeam mounting panel of third direction distribution, preceding lower protection crossbeam mounting panel set up in the side of lower carriage, just preceding lower protection crossbeam mounting panel the mounting plane with first direction is mutually perpendicular, offer on the preceding lower protection crossbeam mounting panel along preceding lower protection crossbeam mounting hole that first direction extends.

As the preferred technical scheme of the front beam of combination formula, frame mounting structure includes a plurality of first frame mounting holes and a plurality of second frame mounting holes, the upper end of first installation department is provided with the frame mounting panel, the mounting plane perpendicular to of frame mounting panel the second direction, the frame mounting panel is followed the first frame mounting hole that a plurality of intervals set up has been seted up to the first direction, the axis direction of first frame mounting hole is parallel to the second direction, a plurality of second frame mounting hole is in be rectangular array setting on the first installation department, just the axis direction of second frame mounting hole is parallel to the third direction.

As the preferred technical scheme of combination formula front flange, driver's cabin mounting structure includes the driver's cabin mounting panel, the driver's cabin mounting panel set up in the upper end of first installation department, and be located and keep away from one side of frame mounting panel, the mounting plane perpendicular to of driver's cabin mounting panel the second direction, set up on the driver's cabin mounting panel a plurality of edges the driver's cabin mounting hole that the first direction interval set up, the axis direction of driver's cabin mounting hole is parallel to the second direction.

As the preferred technical scheme of combination formula front-end beam, head crossbeam mounting structure includes head crossbeam mounting panel, head crossbeam mounting panel set up in the upper end of transition portion, the mounting plane of head crossbeam mounting panel is perpendicular to the second direction, head crossbeam mounting hole has been seted up on the head crossbeam mounting panel, the axis direction of head crossbeam mounting hole is parallel to the second direction.

As the preferred technical scheme of combination formula front flange, seal crossbeam mounting structure includes two seal crossbeam mounting panels, two seal crossbeam mounting panels follow the second direction interval set up in the side of second installation department, seal crossbeam mounting panel's mounting plane perpendicular to first direction, seal crossbeam mounting hole has been seted up on the crossbeam mounting panel, seal crossbeam mounting hole's axis direction is parallel to first direction.

As the preferred technical scheme of combination formula front flange, draw hook mounting structure includes draw hook mount table, draw hook mount table set up in the side of second installation department, and be located the below of closed crossbeam mounting panel, draw hook mount table to be last to be seted up along draw hook mounting hole that the first direction extends.

As the preferred technical scheme of combination formula front flange, battery mounting structure includes the battery mounting panel, the battery mounting panel set up in the upper end of second installation department, the mounting plane of battery mounting panel is perpendicular to the second direction, set up on the battery mounting panel along the battery mounting hole that the second direction extends.

The beneficial effects of the utility model are as follows:

the utility model provides a combined front girder, which comprises an upper bracket and a lower bracket. The upper bracket comprises a first installation part, a second installation part and a transition part, wherein the first installation part and the second installation part are distributed at intervals along a first direction, the first installation part and the second installation part are also distributed at intervals along a second direction, the first direction is perpendicular to the second direction, the first installation part and the second installation part are connected through the transition part, the first installation part is provided with a frame installation structure and a cab installation structure, the transition part is provided with a head beam installation structure and a wheel cover installation structure, and the second installation part is provided with a closed beam installation structure, a traction hook installation structure, a storage battery installation structure and a mud guard installation structure; the lower support is detachably and fixedly connected with the upper support, and is provided with a condenser mounting structure and a front lower protection cross beam mounting structure. Through with preceding flange split for upper bracket and lower carriage two parts, reduced preceding flange integrated into one piece's processing degree of difficulty, be connected upper bracket and lower carriage detachably, convenient to detach and installation set up multiple mounting structure at upper bracket and lower carriage, satisfy the installation demand of each system component of vehicle, the integrated level is high.

Drawings

FIG. 1 is a schematic view of a combined front girder according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the upper rack of FIG. 1;

FIG. 3 is a schematic top view of the upper rack of FIG. 2;

FIG. 4 is a schematic view of the structure of the lower bracket of FIG. 1;

fig. 5 is a schematic left view of the lower bracket of fig. 1.

In the figure:

1. an upper bracket;

11. a first mounting portion; 111. a frame mounting structure; 1111. a first frame mounting hole; 1112. a second frame mounting hole; 1113. a frame mounting plate; 112. cab mounting structure; 1121. a cab mounting plate; 1122. cab mounting holes;

12. a second mounting portion; 121. a closed cross beam mounting structure; 1211. a closed cross beam mounting plate; 1212. closing the beam mounting hole; 1213. an avoidance groove; 122. a towing hook mounting structure; 123. a battery mounting structure; 1231. a battery mounting plate; 1232. a battery mounting hole; 124. a fender mounting structure; 125. a lower bracket mounting hole;

13. a transition section; 131. a head beam mounting structure; 1311. a head beam mounting plate; 1312. a head beam mounting hole; 132. a wheel cover mounting structure;

2. a lower bracket; 21. a condenser mounting structure; 22. front lower protective beam mounting structure; 221. a front lower protective beam mounting plate; 222. front lower protective beam mounting holes; 23. an upper bracket mounting end lug; 231. an upper bracket mounting hole;

3. reinforcing ribs;

4. and a lightening hole.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

As shown in fig. 1 to 5, the embodiment of the present utility model provides a combined front girder, which specifically includes an upper bracket 1 and a lower bracket 2.

As shown in fig. 2, specifically, the upper bracket 1 includes a first mounting portion 11, a second mounting portion 12, and a transition portion 13. The first mounting portion 11 and the second mounting portion 12 are distributed at intervals along a first direction and along a second direction, the first direction is perpendicular to the second direction, the first mounting portion 11 and the second mounting portion 12 are connected through a transition portion 13, and the first mounting portion 11, the second mounting portion 12 and the transition portion 13 are of an integrated structure. The first mounting portion 11 is provided with a frame mounting structure 111 and a cab mounting structure 112, the transition portion 13 is provided with a head rail mounting structure 131 and a wheel cover mounting structure 132, and the second mounting portion 12 is provided with a closed rail mounting structure 121, a towing hook mounting structure 122, a battery mounting structure 123, and a fender mounting structure 124.

As shown in fig. 2 and 4, in particular, the lower bracket 2 is detachably fixedly connected with the upper bracket 1, and the lower bracket 2 is provided with a condenser mounting structure 21 and a front lower guard cross beam mounting structure 22. The bottom of second installation department 12 is provided with a plurality of lower carriage mounting holes 125 along first direction interval, and the axis direction of lower carriage mounting hole 125 is on a parallel with the third direction, and the third direction is all perpendicular with first direction and second direction, and the top of lower carriage 2 is provided with upper bracket mounting end ear 23 along first direction interval, and upper bracket mounting hole 231 along the third direction extension has been seted up to upper bracket mounting end ear 23, and the fastener passes through lower carriage mounting hole 125 and upper bracket mounting hole 231 with lower carriage 2 and upper bracket 1 detachably fixed connection. In detail, in this embodiment, four upper bracket mounting end ears 23 are provided, two of the upper bracket mounting end ears 23 are arranged at intervals along the third direction to form a clamping end ear, the other two upper bracket mounting end ears 23 are distributed at intervals along the first direction, and three lower bracket mounting holes 125 are provided, wherein one lower bracket mounting hole 125 close to the transition portion 13 is an internal threaded hole, the other two lower bracket mounting holes are through holes, and when the upper bracket 1 is fixedly connected with the lower bracket 2, the clamping end ear corresponds to one through hole far away from the transition portion 13, and further, the fastening piece is a bolt and a screw, wherein the screw is used for matching with the internal threaded hole.

Preferably, the external profile of the lower bracket 2 is approximately triangular, further, the external profile of the combined front girder is also approximately triangular, and the double triangle structure can greatly increase the stability of the combined front girder structure.

Illustratively, in the present embodiment, the first direction is a length direction of the combined front girder, the second direction is a height direction of the combined front girder, and the third direction is a width direction of the combined front girder.

The combined front connecting beam provided by the embodiment of the utility model divides the front connecting beam into the upper bracket 1 and the lower bracket 2, and detachably connects the upper bracket 1 and the lower bracket 2 through the fastener, so that the upper bracket 1 and the lower bracket 2 can be respectively cast, the difficulty of integral casting of the front connecting beam is reduced, in addition, the upper bracket 1 and the lower bracket 2 can be cast by adopting different materials, for example, the upper bracket 1 adopts cast iron, and the lower bracket 2 adopts metal alloy with higher strength. The mechanical properties of the material are fully utilized, and the weight of the combined front beam can be optimized.

As shown in fig. 4 and 5, specifically, the condenser mounting structure 21 includes a condenser mounting plate provided at the bottom end of the lower bracket 2 and extending outwardly in the third direction, and provided with a condenser mounting hole extending in the second direction. The condenser mounting hole is a through hole, and the condenser device is fixedly mounted on the condenser mounting plate by utilizing a bolt.

As shown in fig. 4 and 5, specifically, the front lower protective beam mounting structure 22 includes two front lower protective beam mounting plates 221 that are adjacently distributed along the third direction, the front lower protective beam mounting plates 221 are disposed on the side edges of the lower bracket 2 and are located at the bottom of the lower bracket 2, and the mounting plane of the front lower protective beam mounting plates 221 is perpendicular to the first direction, and front lower protective beam mounting holes 222 extending along the first direction are formed in the front lower protective beam mounting plates 221. The front lower protective beam is fixedly mounted on the front lower protective beam mounting plate 221 through bolts, and is used for playing a role in protecting and supporting when a vehicle collides.

As shown in fig. 2 and 3, specifically, the frame mounting structure 111 includes a plurality of first frame mounting holes 1111 and a plurality of second frame mounting holes 1112, the upper end of the first mounting portion 11 is provided with a frame mounting plate 1113, the mounting plane of the frame mounting plate 1113 is perpendicular to the second direction, the frame mounting plate 1113 is provided with a plurality of first frame mounting holes 1111 arranged at intervals along the first direction, the axial direction of the first frame mounting holes 1111 is parallel to the second direction, the plurality of second frame mounting holes 1112 are arranged in a rectangular array on the first mounting portion 11, and the axial direction of the second frame mounting holes 1112 is parallel to the third direction, wherein the first frame mounting holes 1111 and the second frame mounting holes 1112 are through holes, and bolts fixedly mount the frame to the first mounting portion 11 of the upper bracket 1 by penetrating the through holes. Illustratively, the first frame mounting holes 1111 are open three, the second frame mounting holes 1112 are open twelve, and the twelve second frame mounting holes 1112 are equally divided into four rows along the first direction.

As shown in fig. 2 and 3, specifically, the cab mounting structure 112 includes a cab mounting plate 1121, the cab mounting plate 1121 is provided at an upper end of the first mounting portion 11 and is located at a side away from the frame mounting plate 1113, a mounting plane of the cab mounting plate 1121 is perpendicular to the second direction, a plurality of cab mounting holes 1122 are provided in the cab mounting plate 1121 at intervals along the first direction, and an axial direction of the cab mounting holes 1122 is parallel to the second direction. Specifically, three cab mounting holes 1122 are provided, and are through holes, and bolts pass through the cab mounting holes 1122 to fixedly mount the cab suspension bracket to the cab mounting plate 1121.

As shown in fig. 3, specifically, the head-beam mounting structure 131 includes a head-beam mounting plate 1311, the head-beam mounting plate 1311 is provided at an upper end of the transition portion 13, a mounting plane of the head-beam mounting plate 1311 is perpendicular to the second direction, a head-beam mounting hole 1312 is provided on the head-beam mounting plate 1311, and an axial direction of the head-beam mounting hole 1312 is parallel to the second direction. The head rail mounting plate 1311 is used to mount the head rail on the left and right sides of the vehicle.

As shown in fig. 2, specifically, the closed cross beam mounting structure 121 includes two closed cross beam mounting plates 1211, the two closed cross beam mounting plates 1211 are disposed on the side of the second mounting portion 12 at intervals along the second direction, the mounting plane of the closed cross beam mounting plates 1211 is perpendicular to the first direction, closed cross beam mounting holes 1212 are formed in the closed cross beam mounting plates 1211, the axial direction of the closed cross beam mounting holes 1212 is parallel to the first direction, and the closed cross beam mounting plates 1211 are used for mounting the front bumper cross beam. Illustratively, when two closed beam mounting holes 1212 are formed in each closed beam mounting plate 1211 and are located at two ends of the closed beam mounting plate 1211 along the third direction, the two closed beam mounting holes 1212 are threaded holes, and screws and threaded holes cooperate to fixedly mount the front bumper beam on the closed beam mounting plate 1211. Further, a relief groove 1213 is provided in the rear of the end of the closed cross member mounting hole 1212 near the transition portion 13. By the arrangement, the difficulty in machining the threaded hole can be reduced.

As shown in fig. 2, specifically, the towing hook mounting structure 122 includes a towing hook mounting table disposed on a side of the second mounting portion 12 and located below the closed cross beam mounting plate 1211, and the towing hook mounting table is provided with a towing hook mounting hole extending in the first direction, which may be selected as an internal threaded hole or a threaded through hole, and a screw fixedly mounts the vehicle towing hook on the towing hook mounting table through the towing hook mounting hole.

As shown in fig. 2 and 3, specifically, the battery mounting structure 123 includes a battery mounting plate 1231, the battery mounting plate 1231 is disposed at an upper end of the second mounting portion 12, a mounting plane of the battery mounting plate 1231 is perpendicular to the second direction, battery mounting holes 1232 extending in the second direction are provided in the battery mounting plate 1231, the battery mounting plate 1231 is configured with two battery mounting plates 1231 distributed at intervals in the first direction, and the battery mounting plate 1231 is used for mounting a battery fixing bracket. The bolts pass through the battery mounting holes 1232 to fixedly mount the battery fixing bracket to the battery mounting plate 1231.

As shown in fig. 1 and 2, specifically, the wheel cover mounting structure 132 includes wheel cover mounting tables, two of which are arranged at an upper end of the transition portion 13 at intervals along the first direction, on which wheel cover mounting holes extending along the third direction are provided, and further, the wheel cover mounting holes are female screw holes, on which the wheel cover is fixedly mounted by screw-and-female screw hole cooperation.

As shown in fig. 1 and 2, specifically, the fender mounting structure 124 includes a fender mounting boss provided at a lower end of the second mounting portion 12, and a fender mounting hole extending in the third direction is provided on the fender mounting boss, and is an internal threaded hole, and a screw is fitted with the internal threaded hole to fixedly mount the fender on the fender mounting boss.

As shown in fig. 1, it is preferable that a plurality of lightening holes 4 and a plurality of reinforcing ribs 3 are provided on both the upper bracket 1 and the lower bracket 2. Wherein, a plurality of lightening holes 4 shape is various, for example circular, square, trapezoidal and irregular shape, and the size of a plurality of lightening holes 4 is also different, and the purpose that lightening holes 4 set up is: on the basis of ensuring the structural strength, the weight of the combined front connecting beam is reduced to the maximum extent, and the production cost is saved. The plurality of reinforcing ribs 3 comprise horizontal reinforcing ribs, vertical reinforcing ribs, arc-shaped reinforcing ribs and the like, and the purpose of the arrangement is to strengthen the structural strength of the combined front girder.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. The beam is connected before combination formula, its characterized in that includes:

the upper bracket (1) comprises a first mounting part (11), a second mounting part (12) and a transition part (13), wherein the first mounting part (11) and the second mounting part (12) are distributed at intervals along a first direction and a second direction, the first direction is perpendicular to the second direction, the first mounting part (11) and the second mounting part (12) are connected through the transition part (13), the first mounting part (11) is provided with a frame mounting structure (111) and a cab mounting structure (112), the transition part (13) is provided with a head beam mounting structure (131) and a wheel cover mounting structure (132), and the second mounting part (12) is provided with a closed beam mounting structure (121), a traction hook mounting structure (122), a storage battery mounting structure (123) and a mud guard mounting structure (124);

the lower support (2), lower support (2) with upper bracket (1) detachably fixed connection, lower support (2) are provided with condenser mounting structure (21) and preceding lower protection crossbeam mounting structure (22).

2. The combined front girder according to claim 1, wherein a plurality of lower bracket mounting holes (125) are formed in the bottom end of the second mounting portion (12) along the first direction at intervals, the axial direction of the lower bracket mounting holes (125) is parallel to a third direction, the third direction is perpendicular to the first direction and the second direction, an upper bracket mounting end lug (23) is formed in the top end of the lower bracket (2) along the first direction at intervals, an upper bracket mounting hole (231) extending along the third direction is formed in the upper bracket mounting end lug (23), and a fastener is detachably and fixedly connected with the lower bracket (2) and the upper bracket (1) through the lower bracket mounting holes (125) and the upper bracket mounting holes (231).

3. The combined front girder according to claim 2, wherein the condenser mounting structure (21) comprises a condenser mounting plate, the condenser mounting plate is arranged at the bottom end of the lower bracket (2) and extends outwards along the third direction, and the condenser mounting plate is provided with a condenser mounting hole extending along the second direction.

4. The combined front girder according to claim 2, wherein the front lower protective girder mounting structure (22) comprises two front lower protective girder mounting plates (221) distributed along the third direction, the front lower protective girder mounting plates (221) are arranged on the side edges of the lower bracket (2), the mounting plane of the front lower protective girder mounting plates (221) is perpendicular to the first direction, and front lower protective girder mounting holes (222) extending along the first direction are formed in the front lower protective girder mounting plates (221).

5. The combination front rail according to any one of claims 2-4, wherein the frame mounting structure (111) comprises a plurality of first frame mounting holes (1111) and a plurality of second frame mounting holes (1112), a frame mounting plate (1113) is provided at an upper end of the first mounting portion (11), a mounting plane of the frame mounting plate (1113) is perpendicular to the second direction, the frame mounting plate (1113) is provided with a plurality of first frame mounting holes (1111) provided at intervals along the first direction, an axial direction of the first frame mounting holes (1111) is parallel to the second direction, a plurality of second frame mounting holes (1112) are provided in a rectangular array on the first mounting portion (11), and an axial direction of the second frame mounting holes (1112) is parallel to the third direction.

6. The combined front girder according to claim 5, wherein the cab mounting structure (112) comprises a cab mounting plate (1121), the cab mounting plate (1121) is disposed at the upper end of the first mounting portion (11) and is located at a side far away from the frame mounting plate (1113), a mounting plane of the cab mounting plate (1121) is perpendicular to the second direction, a plurality of cab mounting holes (1122) disposed at intervals along the first direction are formed in the cab mounting plate (1121), and an axial direction of the cab mounting holes (1122) is parallel to the second direction.

7. The combined front girder according to any one of claims 2-4, wherein the front girder mounting structure (131) comprises a front girder mounting plate (1311), the front girder mounting plate (1311) is arranged at the upper end of the transition part (13), a mounting plane of the front girder mounting plate (1311) is perpendicular to the second direction, a front girder mounting hole (1312) is formed in the front girder mounting plate (1311), and an axial direction of the front girder mounting hole (1312) is parallel to the second direction.

8. The combined front girder according to any one of claims 2-4, wherein the closed girder installation structure (121) comprises two closed girder installation plates (1211), the two closed girder installation plates (1211) are arranged on the side edge of the second installation part (12) at intervals along the second direction, the installation plane of the closed girder installation plates (1211) is perpendicular to the first direction, closed girder installation holes (1212) are formed in the closed girder installation plates (1211), and the axial direction of the closed girder installation holes (1212) is parallel to the first direction.

9. The modular front girder according to claim 8, wherein the towing hook mounting structure (122) comprises a towing hook mounting table, the towing hook mounting table is arranged at the side edge of the second mounting portion (12) and is located below the closed cross beam mounting plate (1211), and the towing hook mounting table is provided with a towing hook mounting hole extending along the first direction.

10. The combined front girder according to any one of claims 2 to 4, wherein the battery mounting structure (123) comprises a battery mounting plate (1231), the battery mounting plate (1231) is disposed at the upper end of the second mounting portion (12), the mounting plane of the battery mounting plate (1231) is perpendicular to the second direction, and a battery mounting hole (1232) extending along the second direction is formed in the battery mounting plate (1231).