CN111071341A - Small-sized automobile body frame - Google Patents

Abstract

The invention discloses a small automobile body frame which comprises a front automobile body assembly, a front floor assembly, a rear lower automobile body assembly, a left side wall assembly, a right side wall assembly and a top cover assembly, wherein the front end part of the front floor assembly is fixedly connected with the rear part of the front automobile body assembly, the rear end part of the front floor assembly is fixedly connected with the front end part of the rear lower automobile body assembly, the front end of the left side wall assembly is fixedly connected with the left part of the rear end of the front automobile body assembly, the front end of the right side wall assembly is fixedly connected with the right part of the rear end of the front automobile body assembly, the middle part of the top cover assembly is provided with at least one top cover cross beam, and two ends of the top cover cross beam are fixed on side wall upper edge beams of the left side wall assembly. The small automobile body frame is reasonable in layout, improves the torsional rigidity of the tail part of an automobile body, improves the integral torsional rigidity of a white automobile body, and increases the driving safety.

Description

Small-sized automobile body frame

Technical Field

The invention relates to the technical field of automobile frames, in particular to a small automobile body frame.

Background

The body-in-white is used as an automobile bearing main body, and besides loading parts of the whole automobile, a comfortable driving environment and a safe space are provided for passengers; therefore, the body-in-white must have sufficient strength and rigidity to withstand load impacts and collision impacts, and also have a good structure to avoid modal coupling with other excitation sources. A common modularized body-in-white frame is formed by splicing a front body, a front floor, a rear lower body, side walls, a roof and a tail end plate, and in the design process, due to the reasons of size, space, arrangement and the like, a plurality of design defects often exist, as shown in fig. 1 to 11:

1. the top cover beam is distributed, and the front and rear beam spans of the top cover are too large, so that the problems of low mode of a top cover assembly, easy generation of resonance coupling and large noise are caused, and the riding experience and subjective feeling of passengers are influenced;

2. the structure of the tail frame of the vehicle body is poor, so that the torsional rigidity of the tail of the vehicle body is low, the integral torsional rigidity of the white vehicle body is weakened, and the NVH performance is influenced;

3. the transmission path of the rear suspension supporting force of the side wall frame is incomplete, the stress of the suspension is difficult to be transmitted upwards, stress concentration is easy to generate between the wheel cover and the inner plate of the rear side wall frame, and the risk of fatigue cracking is increased;

4. the stress part of the rear wheel cover and the rear side wall inner plate is connected with a lack of a reinforcing part, the joint of the rear wheel cover and the rear side wall inner plate has high stress, the lack of the reinforcing part is easy to generate stress concentration, and fatigue cracking is easy to generate; and the lateral stiffness is also poor;

5. the lower mounting plate of the front vehicle body is transversely lack of a closed loop structure with high strength and high rigidity, and is only connected with an inverted V-shaped structure formed by a single-layer flat plate of the lower mounting plate and the front wall plate, so that the improvement of the mode and the rigidity of the whole vehicle is not facilitated;

6. the lower corner of the A column is designed to be wider, so that the visual field of a driver is poor, and the driving safety is influenced;

7. the condenser mounting point is cantilever type structure, and the mounting point dynamic stiffness is on the low side, easily arouses condenser NVH problem.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and the invention aims to provide a small automobile body frame which is reasonable in layout, improves the dynamic rigidity of a mounting point below a condenser, improves the torsional rigidity of the tail part of an automobile body, improves the integral torsional rigidity of a body-in-white and increases the driving safety.

The invention discloses a small automobile body frame which comprises a front automobile body assembly, a front floor assembly, a rear lower automobile body assembly, a left side wall assembly, a right side wall assembly and a top cover assembly, wherein the front end part of the front floor assembly is fixedly connected with the rear part of the front automobile body assembly, the rear end part of the front floor assembly is fixedly connected with the front end part of the rear lower automobile body assembly, the front end of the left side wall assembly is fixedly connected with the left part of the rear end of the front automobile body assembly, the front end of the right side wall assembly is fixedly connected with the right part of the rear end of the front automobile body assembly, the top cover assembly is fixed between the left side wall assembly and the right side wall assembly, at least one top cover beam is arranged in the middle of the top cover assembly, and two ends of the top cover beam are fixed on side wall upper side beams of the left side wall assembly and the right side wall.

The body frame of the small automobile can also be as follows:

the distances between the top cover cross beam and the top cover front cross beam and between the top cover cross beam and the top cover rear cross beam are both 400-450 mm.

The left side encloses the assembly with the right side encloses and is equipped with tail door frame crossbeam between the assembly back middle part, tip is fixed in respectively about the tail door frame crossbeam the left side encloses the assembly with the right side encloses on the assembly back middle part, tail door frame crossbeam with the left side encloses the assembly with the right side encloses and forms two "mouth" font closed loops between the assembly.

Two longitudinally-arranged tail end plate longitudinal beams are fixed on the left side and the right side of the inner side surface of a tail end plate of the rear lower vehicle body assembly, and the tail end plate longitudinal beams and the tail end plate form a closed tail end plate cavity.

The left side and the right side of the outer side surface of the tail end plate are respectively fixed with a tail end plate outer plate, and the tail end plate outer plates, the frame cross beam and the tail end plate cross beam form a cavity communicated structure.

The left side wall assembly and the rear side wall reinforcing plate of the right side wall assembly extend downwards to the rear wheel cover outer plate through the side wall upper side beam, and the rear side wall reinforcing plate and the top cover beam form a closed loop structure.

The assembly is enclosed on the left side with the right side encloses the rear wheel casing inner panel of assembly and rear side wall inner panel overlap joint department and is equipped with the wheel casing reinforcing plate, the wheel casing reinforcing plate with the rear wheel casing inner panel with form confined wheel casing cavity between the rear side wall inner panel, wheel casing reinforcing plate upper portion with rear side wall inner panel fixed connection, the wheel casing reinforcing plate lower part with rear wheel casing inner panel fixed connection.

And the front vehicle body assembly is provided with a U-shaped water flowing groove.

The assembly is enclosed on the left side with the A post lower extreme that the assembly was enclosed on the right side all is equipped with the triangular window, shelter from the distance before the triangular window and be 130mm, shelter from the distance behind the triangular window and be 100 mm.

The lower bent beam assembly of the front vehicle body assembly is provided with a closed lower bent beam cavity, a condenser mounting point is positioned on the lower bent beam assembly, and the left end and the right end of the lower bent beam assembly are detachably fixed on the girder welding bracket.

The invention discloses a small automobile body frame which comprises a front automobile body assembly, a front floor assembly, a rear lower automobile body assembly, a left side wall assembly, a right side wall assembly and a top cover assembly, wherein the front end part of the front floor assembly is fixedly connected with the rear part of the front automobile body assembly, the rear end part of the front floor assembly is fixedly connected with the front end part of the rear lower automobile body assembly, the front end of the left side wall assembly is fixedly connected with the left part of the rear end of the front automobile body assembly, the front end of the right side wall assembly is fixedly connected with the right part of the rear end of the front automobile body assembly, the top cover assembly is fixed between the left side wall assembly and the right side wall assembly, at least one top cover beam is arranged in the middle of the top cover assembly, and two ends of the top cover beam are fixed on side wall upper side beams of the left side wall assembly and the right side. Like this, the small automobile body frame of this application comprises preceding automobile body assembly, preceding floor assembly, rear portion lower vehicle body assembly, left side enclose assembly, right side enclose assembly and top cap assembly, and whole automobile body frame becomes complete and continuous cage structure, can transmit more effectively and disperse the load for the automobile body, promotes automobile body torsional rigidity and key NVH performance. And a top cover beam is added in the middle of the top cover assembly, two ends of the top cover beam are connected with the side wall upper side beam through welding, and the top of the top cover beam is connected with the top cover assembly through expansion glue, so that the top cover beam is more reasonably distributed. The small automobile body frame is reasonable in layout, improves the dynamic rigidity of the lower mounting point of the condenser, improves the torsional rigidity of the tail part of the automobile body, improves the integral torsional rigidity of the body in white, and increases the driving safety.

Drawings

Fig. 1 is a schematic structural view of a body frame of a small car in the prior art.

Fig. 2 is a partial schematic view of the structure at Z in fig. 1.

Fig. 3 is a view showing a structure of a roof assembly of a body frame of a small car according to the prior art.

Fig. 4 is a rear door frame structure view of a body frame of a small car in the prior art.

Fig. 5 is a view showing an inner side structure of a tail plate of a body frame of a small car according to the prior art.

Fig. 6 is a view showing an outer side structure of a tail plate of a body frame of a small car according to the prior art.

Fig. 7 is a left side wall assembly structure view of a body frame of a small car in the prior art.

Fig. 8 is a structural view of a side wall inner panel and a wheel cover lap joint of a body frame of a small automobile in the prior art.

Fig. 9 is a structural view of a lower end of an a-pillar of a body frame of a small car of the related art.

Fig. 10 is a structural view of a lower mounting point of a condenser of a body frame of a small car of the prior art.

Fig. 11 is a structural view of a cowl area of a body frame of a small car in the related art.

Fig. 12 is a structural view of a roof assembly of a body frame of a small car according to the present invention.

Fig. 13 is a rear door frame structure view of a body frame of a small car according to the present invention.

Fig. 14 is a schematic cross-sectional view of D-D in fig. 13.

Fig. 15 is a view showing the inner side structure of the end plate of the body frame of the small car according to the present invention.

Fig. 16 is a view showing an outer side structure of a tail end plate of a body frame of a small car according to the present invention.

FIG. 17 is a left side wall assembly of a body frame for a small vehicle according to the present invention.

Fig. 18 is a structural view of a side body inner panel and a wheel house of a body frame of a small vehicle according to the present invention.

Fig. 19 is a schematic cross-sectional view of J-J in fig. 18.

Fig. 20 is a structural view of a gutter of a body frame of a small car according to the present invention.

Fig. 21 is a structural view at the lower end of the a-pillar of a body frame of a small-sized vehicle of the present invention.

Fig. 22 is a structural view of a lower condenser mounting point of a body frame of a small car according to the present invention.

Fig. 23 is a structural view of a cowl area of a body frame of a small car according to the present invention.

Fig. 24 is a structural view of a body frame of a small car according to the present invention.

Fig. 25 is an exploded view of a body frame of a small car according to the present invention.

Fig. 26 is a structural view of a down-bent beam assembly of a body frame of a small car according to the present invention.

Fig. 27 is an exploded view of a lower camber beam assembly of a body frame for a small motor vehicle of the present invention.

Fig. 28 is a schematic cross-sectional view F-F of fig. 27.

Fig. 29 is a block diagram of a down bend beam assembly mounted condenser of the present invention.

Description of the figures

1 … vehicle body frame 2 … front vehicle body assembly 3 … front floor assembly

4 … rear lower vehicle body assembly 5 … left side wall assembly 6 … right side wall assembly

7 … roof assembly 8 … roof rail 9 … rear door frame rail

10 … tailgate stringer 11 … tailgate outside panel 12 … quarter gusset

13 … wheel cover reinforcing plate 14 … water flowing groove 15 … triangular window

16 … lower bent beam assembly 17 … condenser mounting point 18 … girder welding support

19 … tail door frame 20 … tail end plate 21 … rear side wall inner plate

22 … rear wheel cover inner plate 24 … front boarding 25 … side wall upper side beam

26 … rear wheel cover outer plate 27 … lower camber beam mounting plate 28 … condenser

33 … main body 29 … front girder 30 … connecting plate of bent-down beam

31 … lower camber beam upper plate 32 … lower camber beam lower plate 34 … upper plate flanging

35 … lower panel flange 36 … upper rib opening 37 … lower rib opening

38 … leakage vent 39 … mistake-proofing mark 40 … bolt mounting hole

Detailed Description

A body frame for a small-sized vehicle according to the present invention will be described in further detail with reference to fig. 12 to 29 of the drawings.

The invention relates to a small automobile body frame, please refer to fig. 12-29, which comprises a front automobile body assembly 2, a front floor assembly 3, a rear lower automobile body assembly 4, a left side wall assembly 5, a right side wall assembly 6 and a top cover assembly 7, wherein the front end part of the front floor assembly 3 is fixedly connected with the rear part of the front automobile body assembly 2, the rear end part of the front floor assembly 3 is fixedly connected with the front end part of the rear lower automobile body assembly 4, the front end of the left side wall assembly 5 is fixedly connected with the left part of the rear end of the front automobile body assembly 2, the front end of the right side wall assembly 6 is fixedly connected with the right part of the rear end of the front automobile body assembly 2, the top cover assembly 7 is fixed between the left side wall assembly 5 and the right side wall assembly 6, the middle part of the top cover assembly 7 is provided with at least one top cover beam 8, the two ends of the top cover beam 8 are fixed on the side wall upper beams 25 of the left side wall, the transverse section of the top cover assembly 7 is in a shape of theta. Like this, the structure of car body frame 1 of kart of this application comprises preceding automobile body assembly 2, preceding floor assembly 3, rear portion lower car body assembly 4, left side encloses assembly 5, right side and encloses assembly 6 and top cap assembly 7, and left side encloses assembly 5 and right side and encloses assembly 6 and rear portion lower car body assembly 4 and be connected to form tail door frame 19, whole automobile body frame configuration becomes complete and continuous cage structure, can transmit and disperse the load of applying to the automobile body more effectively, promotes automobile body torsional rigidity and key NVH performance. And a top cover beam 8 is additionally arranged in the middle of the top cover assembly 7, two ends of the top cover beam are connected with the side wall upper edge beam 25 through welding, the top of the top cover assembly 7 is connected with the top cover assembly 7 through expansion glue, so that the top cover beams 8 are more reasonably distributed, and when one top cover beam 8 is arranged, the transverse cross section of the top cover assembly 7 is in a theta shape. The closed loop of the top cover assembly 7 is changed from a traditional O-shaped closed loop into a theta-shaped closed loop, so that the torsional rigidity and the top cover mode of the whole vehicle are improved, and the noise is reduced. The body frame 1 structure of the small automobile is reasonable in layout, improves the dynamic rigidity of a mounting point below a condenser, improves the torsional rigidity of the tail part of the automobile body, improves the integral torsional rigidity of the body in white, and increases the driving safety.

Referring to fig. 12-29, the frame structure of a small car body according to the present invention may further include: the distances between the top cover beam 8 and the top cover front beam and the top cover rear beam are both 400 mm and 450 mm. Therefore, the distance between the traditional top cover cross beams 8 is controlled within the range of 400-450mm from 670mm, so that the top cover cross beams 8 are distributed more reasonably, the closed loop of the top cover assembly 7 is changed from the traditional O-shaped closed loop into the theta-shaped closed loop, and the torsional rigidity and the top cover mode of the whole automobile are improved. The method can also be as follows: the left side encloses assembly 5 with be equipped with tail door frame crossbeam 9 between the middle part behind the assembly 6 on the right side, both ends are fixed in about tail door frame crossbeam 9 on the middle part behind left side wall assembly 5 with the assembly 6 on the right side encloses, tail door frame crossbeam 9 with the left side encloses assembly 5 with form two "mouth" font closed loops between the assembly 6 on the right side. Therefore, the tail door frame cross beam 9 is additionally arranged in the middle of the tail door frame 19 and is connected with the left side wall assembly 5 and the right side wall assembly 6 through spot welding, the tail door frame cross beam 9 and the left side wall and the right side wall form a closed loop structure, the problems that the closed loop structure of the tail door frame 19 area is weak and the torsional rigidity of the tail part of the vehicle body is low are solved, and the torsional rigidity of the whole vehicle is improved. The method can also be as follows: two longitudinally arranged tail end plate longitudinal beams 10 are fixed on the left side and the right side of the inner side surface of a tail end plate 20 of the rear lower vehicle body assembly 4, and the tail end plate longitudinal beams 10 and the tail end plate 20 form a closed tail end plate cavity. Therefore, two tail end plate longitudinal beams 10 are respectively added on the left side and the right side of the inner side of the tail end plate 20, the structural rigidity and the strength of the tail end plate 20 are improved, and the problem that the torsional rigidity of the tail part of the vehicle body is low, so that the overall torsional rigidity of the vehicle body is weakened is solved. The further preferred scheme is as follows: the left side and the right side of the outer side face of the end plate 20 are both fixed with end plate outer plates 11, and the end plate outer plates 11, the frame cross beam and the end plate 20 cross beam form a closed loop structure. Therefore, two tail end plate longitudinal beams 10 are respectively added on the left side and the right side of the inner side of the tail end plate 20, one tail end plate outer plate 11 is respectively added on the left side and the right side of the outer side of the tail end plate 20 and is connected with the frame cross beam and the tail end plate cross beam to form a longitudinal grid type closed loop structure, the structural strength and rigidity of the tail end plate 20 area are improved, and the problems that a complete closed loop cavity structure is not formed in the tail end plate 20 area, the torsional rigidity of the tail portion of a vehicle body is low, and.

Referring to fig. 12-29, a body frame 1 structure of a small car according to the present invention may further include: the rear side wall reinforcing plate 12 of the left side wall assembly 5 and the right side wall assembly 6 extends downwards from a side wall upper edge beam 25 to a rear wheel cover outer plate 26, and the rear side wall reinforcing plate 12 and the top cover cross beam 8 form a closed loop structure. Therefore, the left side wall assembly 5 and the rear side wall reinforcing plate 12 of the right side wall assembly 6 extend downwards from the side wall roof side rail 25 to the rear wheel casing outer plate 26, the cavity of the rear side wall reinforcing plate 12 is vertically communicated, the side wall roof side rail 25 and the rear wheel casing outer plate 26 are connected, the left rear side wall reinforcing plate 12 and the right rear side wall reinforcing plate 12 form a closed loop structure with the top cover cross beam 8, the evacuation of the transmission of rear overhang load is facilitated, and the whole framework of the automobile body is effectively reinforced. The method can also be as follows: the assembly 5 is enclosed on the left side with the right side encloses rear wheel casing inner panel 22 of assembly 6 and rear side wall inner panel 21 overlap joint department and is equipped with wheel casing reinforcing plate 13, wheel casing reinforcing plate 13 with rear wheel casing inner panel 22 with form confined wheel casing cavity between the rear side wall inner panel 21, wheel casing reinforcing plate 13 upper portion with rear side wall inner panel 21 fixed connection, wheel casing reinforcing plate 13 lower part with rear wheel casing inner panel 22 fixed connection. Like this, increase a wheel casing reinforcing plate 13 in rear wheel casing inner panel 22 and rear side wall inner panel 21 overlap joint department, through spot welding connection, strengthen rear wheel casing and rear side wall inner panel 21 overlap joint department structure, increase the safety margin, reduce the risk that produces fatigue fracture under the high stress, strengthen the transverse connection rigidity simultaneously. The method can also be as follows: the front vehicle body assembly 2 is provided with a U-shaped water flowing groove 14. Thus, a U-shaped flume 14 structure is designed on the front vehicle body assembly 2, and is connected with the front wall plate 24 and the mounting plate on the front wall plate 24 in a spot welding and gluing manner and is connected with the outer plates of the left front wheel cover and the right front wheel cover in a spot welding manner; after the height of the water flowing groove 14 is divided by the front wall plate 24, the overall size of the body of the front wall plate 24 is reduced, and the rigidity of the body of the front wall plate 24 is favorably improved; the U-shaped water flowing groove 14 structure is designed to effectively enhance the transverse connection rigidity of the front baffle area and the front upper area of the front coaming 24, and improve the torsion rigidity of the whole vehicle. The method can also be as follows: the left side encloses assembly 5 with the right side encloses assembly 6's A post lower extreme all is equipped with triangular window 15, shelter from the distance before triangular window 15 and be 130mm, shelter from the distance behind the triangular window 15 and be 100 mm. Like this, the motorcycle type of this application reduces driver's field of vision and shelters from (former sheltering from length for 325mm, shelters from around increasing behind the triangular window 15 and reduces to 130mm and 100mm respectively) at A post lower extreme design triangular window 15, improves the driver field of vision, increases driving safety. The method can also be as follows: the lower bent beam assembly 16 of the front vehicle body assembly 2 is provided with a closed lower bent beam cavity, a condenser mounting point 17 is positioned on the lower bent beam assembly 16, and the left end and the right end of the lower bent beam assembly 16 are detachably fixed on a girder welding bracket 18. Like this, the camber beam assembly 16 is equipped with confined camber beam cavity down, is equipped with condenser mounting point 17 on the camber beam assembly 16 moreover, and the condenser can be dismantled and be fixed in on the condenser mounting point 17, has improved the dynamic stiffness of condenser through the camber beam cavity down, and the left and right sides passes through the bolt and is connected with left and right sides girder welding stent 18, promotes condenser lower mounting point dynamic stiffness. The method can also be as follows: this patent is optimized the 24 ribs moderate degree of preceding bounding wall, and 24 reinforcing plate lengths of bounding wall before the increase, and the air conditioner is gone into the wind gap and is moved to the tye 14 from preceding bounding wall 24 on, from 24 body segmentation tye 14 of preceding bounding wall, preceding 24 body height of bounding wall reduce, and the size reduces, promotes body rigidity, and it is low on the low side to solve preceding 24 modal value of bounding wall, the easy problem with whole car cavity mode coincidence.

Referring to fig. 12-29, a body frame of a small car according to the present invention may further include: the lower camber beam assembly 16 includes the lower camber beam main part 33 and two lower camber beam mounting panels 27 that are equipped with closed cavity, one the lower camber beam mounting panel 27 is located on the left end portion of lower camber beam main part 33, another the lower camber beam mounting panel 27 is located on the right-hand member portion of lower camber beam main part 33, fixed connection can be dismantled with preceding girder 29 to the lower camber beam mounting panel 27, and condenser 28 can be dismantled and be fixed in camber beam main part 33 upper portion down. Therefore, the lower bent beam main body 33 is provided with a closed cavity, the structural rigidity and strength of the lower bent beam main body 33 can be improved through the cavity, and then the condenser 28 is installed on the lower bent beam main body 33, so that the dynamic rigidity of the condenser 28 is improved; and two down-bent beam mounting plates 27 are respectively fixed at the left and right end parts of the down-bent beam main body 33, and the down-bent beam mounting plates 27 are detachably fixed on the front girder 29, so that a production line does not need to be specially fixed and avoided during collinear production of multiple vehicles, and the compatibility of the production line is improved. The compatibility of collinear production of multiple vehicle types can be effectively improved, on-site assembly is facilitated, and rework is reduced. The requirements of installation of the condenser 28, dynamic rigidity of parts and NVH performance can be met under the condition of locally limited space, and sectional design is adopted, so that the control of installation size is facilitated, the corrosion resistance is improved, and the product quality is improved.

Further preferably, a lower camber beam connecting plate 30 is arranged at the joint of the lower camber beam mounting plate 27 and the lower camber beam main body 33, the upper part of the lower camber beam connecting plate 30 is fixed with the inner side surface of the lower camber beam mounting plate 27, and the lower part of the lower camber beam connecting plate 30 is abutted against and fixed with the outer side surface of the lower camber beam main body 33. In this way, the lower camber beam connecting plate 30 is provided at the joint between the lower camber beam mounting plate 27 and the lower camber beam main body 33, so that the connection strength between the lower camber beam mounting plate 27 and the lower camber beam main body 33 is further improved. The further preferred scheme is as follows: the underbeam main body 33 includes underbeam upper plate 31 and underbeam lower plate 32, underbeam upper plate 31 with underbeam lower plate 32 encloses into the cavity, underbeam upper plate 31 is fixed in underbeam lower plate 32 top, one down the tip is fixed in under the underbeam mounting panel 27 the underbeam upper plate 31 with between the underbeam lower plate 32 left end portion, another the tip is fixed in under the underbeam mounting panel 27 the underbeam upper plate 31 with between the underbeam lower plate 32 right end portion, condenser 28 can dismantle and be fixed in underbeam upper plate 31 top. Like this, the curved roof beam main part 33 down of this application adopts the sectional type structure, and the relative traditional structure of single part "nearly" style of calligraphy becomes "L" type, not only is favorable to reducing the punching press degree of difficulty of singleton, also is favorable to mounting dimension and local size control, and the easy later stage of size deviation is adjusted. The further preferred scheme is as follows: be equipped with condenser mounting point 17 on the camber beam upper plate 31 down, condenser 28 passes through condenser mounting point 17 can dismantle and be fixed in on the camber beam upper plate 31 down. Therefore, the lower camber beam main body 33 is formed into a closed cavity by closing the L-shaped sections of the lower camber beam upper plate 31 and the lower camber beam lower plate 32 up and down, and then the condenser mounting point 17 for mounting the condenser 28 is arranged on the lower camber beam upper plate 31, so that the rigidity and NVH performance of parts can be effectively improved in a limited space. The further preferred scheme is as follows: the lower camber beam upper plate 31 is provided with an upper plate flanging 34 extending from the left end to the right end of the lower camber beam upper plate 31, the lower camber beam lower plate 32 is provided with a lower plate flanging 35 extending from the left end to the right end of the lower camber beam lower plate 32, and the upper plate flanging 34 is fixedly connected with the lower plate flanging 35. Like this, be equipped with upper plate turn-ups 34 on the camber beam upper plate 31 down, be equipped with down turn-ups 35 on the camber beam hypoplastron 32 down, then fix upper plate turn-ups 34 with down turn-ups 35, can transmit the dispersion through the effectual power of will of down turn-ups 35 and upper plate turn-ups 34, prevent down camber beam upper plate 31 and camber beam hypoplastron 32 because of the atress is concentrated and is leaded to the condition such as fracture to take place. The further preferred scheme is as follows: the upper plate flanging 34 is provided with an upward convex upper rib opening 36, the lower plate flanging 35 is provided with a downward concave lower rib opening 37 corresponding to the upper rib opening 36, and the upper rib opening 36 and the lower rib opening 37 form a liquid leakage exhaust hole 38. Thus, the lap joint surface of the upper plate flanging 34 and the lower plate flanging 35 is provided with the liquid leakage vent hole 38 and the fabrication holes of the upper camber beam upper plate and the upper camber beam lower plate, the adhesion thickness of a paint film in the cavity is enhanced, and the integral corrosion resistance is improved. The further preferred scheme is as follows: the upper panel flange 34 and the lower panel flange 35 are provided with a downward sloping slope of 5 °. Therefore, the upper plate flanging 34 and the lower plate flanging 35 are inclined downwards by 5 degrees, and the condensation of water vapor on the plane can be effectively reduced. The upper surface of the lower camber beam main body 33 is provided with an error-proof mark 39. Like this, set up mistake proofing sign 39 on camber beam main part 33 upper surface down, can effectual improvement staff's the degree of discerning, and then improve work efficiency. The method can also be as follows: at least two bolt mounting holes 40 are formed in the lower camber beam mounting plate 27, and the lower camber beam mounting plate 27 is detachably fixed to the front girder 29 through the bolt mounting holes 40 and bolts. Thus, the left end and the right end of the lower bent beam mounting plate 27 are provided with holes, a mounting bracket is welded on the side surface of the front girder 29, and the lower bent beam mounting plate 27 is connected with the girder through a bolt; the production line is not required to be specially fixed and avoided during collinear production of multiple vehicle types, and the compatibility of the production line is improved. The method can also be as follows: the longitudinal section of the lower camber beam main body 33 is L-shaped. Thus, the L-shaped downward bent beam main body 33 forms a closed cavity, and the installation strength of the condenser installation point 17 can be effectively improved.

The above description is only for the purpose of illustrating a few embodiments of the present invention, and should not be taken as limiting the scope of the present invention, in which equivalent changes, modifications, or scaling up or down, etc. made in accordance with the spirit of the present invention should be considered as falling within the scope of the present invention.

Claims (10)

1. A small-sized automobile body frame is characterized in that: enclose assembly, right side and top cap assembly under body assembly, left side including preceding automobile body assembly, preceding floor assembly, rear portion, preceding floor assembly front end with preceding automobile body assembly rear portion fixed connection, preceding floor assembly rear end with body assembly front end fixed connection under the rear portion, the left side enclose the assembly front end with preceding automobile body assembly rear end left part fixed connection, the right side enclose the assembly front end with preceding automobile body assembly rear end right part fixed connection, the top cap assembly is fixed in the left side enclose the assembly with the right side encloses between the assembly, top cap assembly middle part is equipped with an at least top cap crossbeam, top cap crossbeam both ends are fixed in the left side enclose the assembly with the right side encloses the side of assembly and encloses on the roof beam.

2. The small car body frame according to claim 1, characterized in that: the distances between the top cover cross beam and the top cover front cross beam and between the top cover cross beam and the top cover rear cross beam are both 400-450 mm.

3. The small car body frame according to claim 1, characterized in that: the left side encloses the assembly with the right side encloses and is equipped with tail door frame crossbeam between the assembly back middle part, tip is fixed in respectively about the tail door frame crossbeam the left side encloses the assembly with the right side encloses on the assembly back middle part, tail door frame crossbeam with the left side encloses the assembly with the right side encloses and forms two "mouth" font closed loops between the assembly.

4. A small-sized vehicle body frame according to any one of claims 1 to 3, characterized in that: two longitudinally-arranged tail end plate longitudinal beams are fixed on the left side and the right side of the inner side surface of a tail end plate of the rear lower vehicle body assembly, and the tail end plate longitudinal beams and the tail end plate form a closed tail end plate cavity.

5. The small car body frame according to claim 4, wherein: the left side and the right side of the outer side surface of the tail end plate are respectively fixed with a tail end plate outer plate, and the tail end plate outer plates, the frame cross beam and the tail end plate cross beam form a cavity communicated structure.

6. A small-sized vehicle body frame according to any one of claims 1 to 3, characterized in that: the left side wall assembly and the rear side wall reinforcing plate of the right side wall assembly extend downwards to the rear wheel cover outer plate through the side wall upper side beam, and the rear side wall reinforcing plate and the top cover beam form a closed loop structure.

7. A small-sized vehicle body frame according to any one of claims 1 to 3, characterized in that: the assembly is enclosed on the left side with the right side encloses the rear wheel casing inner panel of assembly and rear side wall inner panel overlap joint department and is equipped with the wheel casing reinforcing plate, the wheel casing reinforcing plate with the rear wheel casing inner panel with form confined wheel casing cavity between the rear side wall inner panel, wheel casing reinforcing plate upper portion with rear side wall inner panel fixed connection, the wheel casing reinforcing plate lower part with rear wheel casing inner panel fixed connection.

8. A small-sized vehicle body frame according to any one of claims 1 to 3, characterized in that: and the front vehicle body assembly is provided with a U-shaped water flowing groove.

9. A small-sized vehicle body frame according to any one of claims 1 to 3, characterized in that: the assembly is enclosed on the left side with the A post lower extreme that the assembly was enclosed on the right side all is equipped with the triangular window, shelter from the distance before the triangular window and be 130mm, shelter from the distance behind the triangular window and be 100 mm.

10. A small-sized vehicle body frame according to any one of claims 1 to 3, characterized in that: the lower bent beam assembly of the front vehicle body assembly is provided with a closed lower bent beam cavity, a condenser mounting point is positioned on the lower bent beam assembly, and the left end and the right end of the lower bent beam assembly are detachably fixed on the girder welding bracket.

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