CN215436623U

CN215436623U - Steel-aluminum hybrid vehicle body frame structure

Info

Publication number: CN215436623U
Application number: CN202120077750.4U
Authority: CN
Inventors: 杨宏
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2022-01-07
Anticipated expiration: 2031-01-11

Abstract

The utility model provides a steel-aluminum mixed vehicle body frame structure which comprises a vehicle body front frame, a vehicle body main frame and a vehicle body rear frame, wherein nine annular closed structures are formed on the vehicle body main frame, four annular closed structures are formed on the vehicle body front frame, four annular closed structures are formed on the vehicle body rear frame, and two annular closed structures are formed between the vehicle body front frame and the vehicle body main frame in a surrounding manner. According to the steel-aluminum hybrid vehicle body frame structure provided by the utility model, 19 closed-loop structures are formed in the whole vehicle body, so that the vehicle body frame forms a multi-ring cage structure, the battery pack frame is more favorably coupled, the bending rigidity and the mode of the whole vehicle body frame are improved, and the comfort of passengers and the safety performance of collision are favorably improved; the whole vehicle body frame structure adopts the frame structure of the independently researched and developed steel-aluminum hybrid vehicle body, so that the integral rigidity of the vehicle body is improved and the light weight of the vehicle body is realized on the premise of meeting the collision safety performance of the vehicle body frame.

Description

Steel-aluminum hybrid vehicle body frame structure

Technical Field

The utility model relates to the technical field of automobile body-in-white, in particular to a steel-aluminum mixed automobile body frame structure.

Background

With the rapid development of the automotive industry, automobiles have become very popular products in our lives. The body-in-white frame assembly is used as a main body for bearing load and resisting collision impact of the whole vehicle, and the design of the body-in-white frame assembly plays a decisive role in the performances of strength, rigidity, modal, safety, durability and the like of the vehicle body, and directly influences the riding experience and subjective feeling of a user. In the existing white vehicle body structure, closed loops in a vehicle body frame are few, the relevance between structures is few, the connection performance between an upper vehicle body and a lower vehicle body is weak, the integrity of the white vehicle body is poor, energy generated by collision cannot be effectively absorbed and dispersed during collision, and the injury to passengers is great. And the existing body-in-white frame framework is mostly welded by adopting a beam frame structure, and is mostly in a front steel or aluminum structure, so that the rigidity of the body is poor, and the lightweight effect is not obvious.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects that the existing steel-aluminum hybrid vehicle body structure is mostly formed by welding front steel or aluminum structures, so that the relevance among the structures is small, the rigidity is poor, the weight is light and unobvious, and provides a steel-aluminum hybrid vehicle body frame structure.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a steel-aluminum hybrid vehicle body frame structure comprises a vehicle body front frame, a vehicle body main frame and a vehicle body rear frame, wherein the vehicle body main frame comprises a floor frame, a left side plate frame, a right side plate frame and a top cover frame, and four annular closed structures are formed on the vehicle body front frame; four annular closed structures are formed on the rear frame of the vehicle body; the front frame of the vehicle body and the main frame of the vehicle body are enclosed to form two annular closed structures; form nine cyclic annular enclosed construction on the automobile body main frame, include two cyclic annular enclosed constructions that form on the floor frame of automobile body main frame, a cyclic annular enclosed construction that forms on the top cap frame of automobile body main frame two cyclic annular enclosed constructions that form on the left side board frame two cyclic annular enclosed constructions that form on the right side board frame and the floor frame of automobile body main frame the left side board frame the right side board frame with two cyclic annular enclosed constructions that form are closed in the vertical direction to the top cap frame.

Furthermore, four annular closed structures formed on the front frame of the vehicle body are respectively a first horizontal closed-loop structure, a second horizontal closed-loop structure, a first vertical closed-loop structure and a second vertical closed-loop structure; the first horizontal closed-loop structure is formed by enclosing a front anti-collision beam, a left front longitudinal beam, a front wall cross beam and a right front longitudinal beam; the second horizontal closed-loop structure is formed by enclosing a wind window beam, a left upper short beam, a headlamp beam, a front end module and a right upper short beam; the first vertical closed loop structure is composed of a radiator frame; the second vertical closed-loop structure is formed by enclosing a front cabin cross beam, an aluminum alloy tower seat, a left longitudinal beam, a right longitudinal beam and a front wall cross beam.

Further, the bottom of the aluminum alloy tower base is fixedly connected with the left longitudinal beam or the right longitudinal beam, one end of the top of the aluminum alloy tower base is fixedly connected with the front wall cross beam, and the other end of the top of the aluminum alloy tower base is fixedly connected with the upper left short beam or the upper right short beam.

Furthermore, four annular closed structures formed on the rear frame of the vehicle body are respectively a third horizontal closed-loop structure, a fourth horizontal closed-loop structure, a third vertical closed-loop structure and a fourth vertical closed-loop structure; the third horizontal closed-loop structure is formed by enclosing a second middle floor cross beam, the left longitudinal beam, the right longitudinal beam and a lower rear floor cross beam; the fourth horizontal closed-loop structure is formed by enclosing a rear coaming, the left longitudinal beam, the right longitudinal beam and the lower cross beam of the rear floor; the third vertical closed-loop structure is formed by enclosing a top cover rear cross beam, a left D column, a right D column, a left wheel cover stand column, a right wheel cover stand column and the rear floor lower cross beam; and the fourth vertical closed-loop structure is formed by enclosing the top cover rear cross beam, the left frame opening beam, the right frame opening beam and the back panel beam.

Specifically, two annular closed structures which are formed by enclosing the front vehicle body frame and the main vehicle body frame are respectively a fifth vertical closed-loop structure and a sixth vertical closed-loop structure; the fifth vertical closed-loop structure is formed by enclosing a left A column, a right A column, a top cover front cross beam and the air window cross beam; the sixth vertical closed-loop structure is formed by enclosing the top cover front cross beam, the left A column, the right A column, the left A lower column, the right A lower column and the front wall cross beam.

Specifically, two annular closed structures formed on a floor frame of the main vehicle body frame are a fifth horizontal closed-loop structure and a sixth horizontal closed-loop structure respectively; the fifth horizontal closed-loop structure is formed by enclosing a front wall lower cross beam, a left threshold beam, a front floor second seat cross beam and a right threshold; and the sixth horizontal closed-loop structure is formed by enclosing the front floor second seat cross beam, the left doorsill beam, the right doorsill and the middle floor second cross beam.

Specifically, an annular closed structure formed on a roof frame of the main car body frame is a seventh horizontal closed-loop structure, and the seventh horizontal closed-loop structure is formed by enclosing a skylight framework.

Specifically, two annular closed structures formed on the left side plate frame are respectively a seventh vertical closed-loop structure and an eighth vertical closed-loop structure; the seventh vertical closed-loop structure is formed by enclosing the left A column, the left B column, the left doorsill beam and the left A lower column beam; the eighth vertical closed loop structure comprises a left top cover side beam, a left C column lower joint beam, a left threshold beam and a left B column.

Specifically, two annular closed structures formed on the right side plate frame are respectively a ninth vertical closed-loop structure and a tenth vertical closed-loop structure; the ninth vertical closed-loop structure is formed by enclosing the right column A, the right column B, the right doorsill and a right lower column A; and the tenth vertical closed-loop structure is formed by enclosing a right top cover boundary beam, a right C column lower joint beam, the right doorsill and the right B column.

Specifically, the floor frame, the left side plate frame, the right side plate frame and the roof frame of the main vehicle body frame enclose in the vertical direction to form two annular closed structures, namely an eleventh vertical closed-loop structure and a twelfth vertical closed-loop structure; the eleventh vertical closed-loop structure is formed by enclosing the left B column, the right B column, a second beam of the front floor and a skylight beam; the twelfth vertical closed-loop structure is formed by enclosing a top cover beam, the left C column, the right C column, the left C column lower joint beam, the right C column lower joint beam and the middle floor second beam.

The steel-aluminum hybrid vehicle body frame structure provided by the utility model has the beneficial effects that: 19 closed loop structures are formed in the whole vehicle body, so that a vehicle body frame forms a multi-ring cage structure, the multi-ring cage structure is more favorable for coupling of a battery pack frame, the bending rigidity and the mode of the whole vehicle body frame are improved, and the comfort of passengers and the safety performance of collision are improved; whole automobile body frame construction has adopted the frame construction of the mixed automobile body of steel aluminium of independent research and development, wherein aluminium accounts for 80% down in the automobile body structure, the steel accounts for 20%, frame roof beam among the whole closed loop construction all adopts aluminium alloy extrusion, the panel adopts punching press aluminum plate, the overlap joint transition region of going up the automobile body adopts the steel automobile body, and last automobile body has adopted the aluminum alloy to connect with a plurality of junctions of lower automobile body, under the prerequisite that satisfies automobile body frame collision security performance, the rigidity of the whole frame of automobile body can also be promoted, realize the lightweight demand of automobile body.

Drawings

Fig. 1 is a frame structure view of a ring-shaped closed structure formed in a horizontal direction of a steel-aluminum hybrid vehicle body frame structure provided by the present invention;

FIG. 2 is a frame structure view of an annular closed structure formed in a first vertical direction of a steel-aluminum hybrid vehicle body frame structure provided by the present invention;

FIG. 3 is a frame structure view of an annular closed structure formed in a second vertical direction of a steel-aluminum hybrid vehicle body frame structure provided by the present invention;

FIG. 4 is an enlarged view of a portion of a tower seat of a steel-aluminum hybrid vehicle body frame structure according to the present invention;

FIG. 5 is a partial enlarged view of a front rail joint in a steel-aluminum hybrid vehicle body frame structure provided by the present invention;

FIG. 6 is a partially enlarged view of a first rear side rail joint in a steel-aluminum hybrid vehicle body frame structure according to the present invention;

fig. 7 is a partially enlarged view of a joint of a second rear side member in the steel-aluminum hybrid vehicle body frame structure provided by the utility model.

In the figure: 100-steel-aluminum hybrid vehicle body frame construction;

11-a first horizontal closed-loop structure, 12-a second horizontal closed-loop structure, 13-a third horizontal closed-loop structure, 14-a fourth horizontal closed-loop structure, 15-a fifth horizontal closed-loop structure, 16-a sixth horizontal closed-loop structure, 17-a seventh horizontal closed-loop structure;

21-a first vertical closed-loop structure, 22-a second vertical closed-loop structure, 23-a third vertical closed-loop structure, 24-a fourth vertical closed-loop structure, 25-a fifth vertical closed-loop structure, 26-a sixth vertical closed-loop structure, 27-a seventh vertical closed-loop structure, 28-an eighth vertical closed-loop structure, 29-a ninth vertical closed-loop structure, 30-a tenth vertical closed-loop structure, 31-an eleventh vertical closed-loop structure, 32-a twelfth vertical closed-loop structure;

41-aluminum alloy tower base, 42-left longitudinal beam, 43-left upper short beam and 44-front wall beam;

51-front longitudinal beam joint, 52-front longitudinal beam, 53-threshold beam, 54-A lower column, 55-inclined support beam and 56-front wall lower cross beam;

61-a first rear longitudinal beam joint, 62-a C column lower joint beam and 63-a middle floor second cross beam;

71-second rear longitudinal beam joint, 72-rear underfloor cross beam, 73-longitudinal beam extension beam and 74-wheel cover reinforcing beam.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 1 to 7, a steel-aluminum hybrid vehicle body frame structure 100 according to the present invention is provided. In the steel-aluminum hybrid vehicle body frame structure 100 provided by the utility model, the lower vehicle body is made of more aluminum materials, the upper vehicle body is made of more steel materials, and the joint of the steel and aluminum is made of aluminum alloy materials to ensure the rigidity and stability of the whole vehicle body structure. The body-in-white portion of the steel-aluminum hybrid vehicle body frame structure 100 provided by the utility model integrally comprises a vehicle body front frame, a vehicle body main frame and a vehicle body rear frame, wherein the vehicle body main frame comprises a floor frame, a left side plate frame, a right side plate frame and a top cover frame. The mutual connection among all parts inside the front frame, the main frame and the rear frame of the automobile body and the mutual lap joint among the three are realized by riveting, screwing, spot welding, structural glue and other process modes according to actual needs.

Further, as shown in fig. 1-3, nine annular closed structures are formed on the main frame of the car body in the steel-aluminum hybrid car body frame structure 100 provided by the utility model; four annular closed structures are formed on the front frame of the vehicle body, four annular closed structures are formed on the rear frame of the vehicle body, and two annular closed structures are formed between the front frame of the vehicle body and the main frame of the vehicle body in a surrounding manner. In the whole steel-aluminum hybrid vehicle body frame structure 100, 19 annular closed structures are formed in the horizontal direction and the vertical direction, so that the steel-aluminum hybrid vehicle body frame structure 100 forms a multi-element ring cage structure (MMCB), and a plurality of formed closed loops are coupled with a battery frame inside a vehicle body, so that the torsional rigidity of a platform series white vehicle body is superior to that of a main stream standard vehicle type on the market, the C-NCAP five-star collision requirement can be met, and the leading level of the domestic same-level vehicle type is reached.

As shown in fig. 1 and 2, four annular closed structures are formed on the front frame of the vehicle body, namely, a first horizontal closed-loop structure 11, a second horizontal closed-loop structure 12, a first vertical closed-loop structure 21 and a second vertical closed-loop structure 22.

Specifically, as shown in fig. 1, the first horizontal closed-loop structure 11 is enclosed by a front impact beam, a left front longitudinal beam, a front cross beam and a right front longitudinal beam; the second horizontal closed loop structure 12 is enclosed by a wind window beam, an upper left short beam 43, a headlight beam, a front end module and an upper right short beam.

Specifically, as shown in fig. 2, the first vertical closed-loop structure 21 is composed of a radiator frame; the second vertical closed-loop structure 22 is enclosed by a front cabin cross beam, an aluminum alloy tower base 41, a left longitudinal beam 42, a right longitudinal beam and a front wall cross beam 44.

Further, as shown in fig. 4, a steel-aluminum hybrid vehicle body frame structure 100 according to the present invention has a partially enlarged view of the aluminum alloy tower 41. In the vehicle body front frame structure provided by the utility model, in order to enable the second vertical closed-loop structure 22 to form a continuous closed loop in the vertical direction and ensure that a continuous loop can be formed between the front wall cross beam 44 and the upper short beam and between the bottom longitudinal beams, the aluminum alloy tower base 41 is additionally arranged between the longitudinal beams and the upper short beam.

Specifically, the front frame of the vehicle body has a total of two aluminum alloy towers 41 respectively disposed on both sides of the cowl cross member 44. The bottom of the aluminum alloy tower base 41 is fixed on the left longitudinal beam 42, and the top is fixed on the left upper short beam 43. Or the bottom of the aluminum alloy tower seat 41 is fixed on the right longitudinal beam, and the top of the aluminum alloy tower seat is fixed on the upper right short beam. As shown in fig. 4, the bottom of the aluminum alloy tower base 41 is fixedly connected to the left longitudinal beam 42, one end of the top of the aluminum alloy tower base 41 is fixedly connected to the front wall cross beam 44, and the other end of the top of the aluminum alloy tower base 41 is fixedly connected to the left upper short beam 43.

Further, as shown in fig. 1 and 2, four annular closed structures, namely a third horizontal closed-loop structure 13, a fourth horizontal closed-loop structure 14, a third vertical closed-loop structure 23 and a fourth vertical closed-loop structure 24, are formed on the rear frame of the vehicle body.

Specifically, as shown in fig. 1, the third horizontal closed-loop structure 13 is enclosed by the middle-floor second cross beam, the left longitudinal beam 42, the right longitudinal beam, and the rear-floor lower cross beam, and the fourth horizontal closed-loop structure 14 is enclosed by the rear coaming, the left longitudinal beam 42, the right longitudinal beam, and the rear-floor lower cross beam.

Specifically, as shown in fig. 2, the third vertical closed-loop structure 23 is formed by a top cover rear cross beam, a left D column, a right D column, a left wheel cover column, a right wheel cover column, and a rear under-floor cross beam, and the fourth vertical closed-loop structure 24 is formed by enclosing a top cover rear cross beam, a left frame opening beam, a right frame opening beam, and a rear coaming beam.

Further, as shown in fig. 2, two annular closed structures, namely a fifth vertical closed-loop structure 25 and a sixth vertical closed-loop structure 26, are enclosed between the front vehicle body frame and the main vehicle body frame. Specifically, as shown in fig. 2, the fifth vertical closed-loop structure 25 is enclosed by a left a-pillar, a right a-pillar, a roof front cross member, and a windshield cross member; the sixth vertical closed-loop structure 26 is enclosed by the roof front cross member, left a pillar, right a pillar, left a lower pillar, right a lower pillar, and front wall cross member 44.

Further, as shown in fig. 1 to 3, nine ring-shaped closed structures are formed on the main vehicle body frame, wherein two ring-shaped closed structures are formed on the floor frame of the main vehicle body frame, one ring-shaped closed structure is formed on the roof frame of the main vehicle body frame, two ring-shaped closed structures are formed on the right side plate frame of the main vehicle body frame, and the floor frame, the left side plate frame, the right side plate frame and the roof frame of the main vehicle body frame are combined to form two ring-shaped closed structures in the vertical direction. Nine annular closed structures formed on the main frame of the vehicle body are mutually staggered and surrounded at the main body of the vehicle body in the horizontal direction and the vertical direction, the steel-aluminum mixed multi-element ring cage vehicle body frame which is independently researched and developed realizes a three-dimensional closed loop structure, the overall safety performance of the vehicle body can be greatly improved, and the steel-aluminum mixed vehicle body is adopted, so that the weight of the vehicle body frame can be effectively reduced, the bending rigidity and the mode of the whole frame are improved, and the comfort and the safety performance during collision of passengers in the vehicle body are improved.

Specifically, as shown in fig. 1, two annular closed structures, namely a fifth horizontal closed-loop structure 15 and a sixth horizontal closed-loop structure 16, are formed on the floor frame of the main frame of the vehicle body; the fifth horizontal closed-loop structure 15 is formed by enclosing a front wall lower cross beam, a left threshold beam, a front floor second seat cross beam and a right threshold; the sixth horizontal closed-loop structure 16 is formed by enclosing the front floor second seat cross member, the left threshold beam, the right threshold, and the middle floor second cross member. As shown in fig. 1, a seventh horizontal closed loop structure 17 of an annular closed structure is formed on the roof frame of the main frame of the vehicle body, and the seventh horizontal closed loop structure 17 is enclosed by a sunroof frame.

Specifically, as shown in fig. 3, two annular closed structures, namely a seventh vertical closed-loop structure 27 and an eighth vertical closed-loop structure 28, are formed on the left side plate frame in the main frame of the vehicle body; two annular closed structures, namely a ninth vertical closed-loop structure 29 and a tenth vertical closed-loop structure 30 are formed on the right side plate frame in the main frame of the vehicle body. The seventh vertical closed-loop structure 27 is formed by enclosing a left A column, a left B column, a left doorsill beam and a left A lower column beam, and the eighth vertical closed-loop structure 28 is formed by enclosing a left top cover side beam, a left C column lower joint beam, a left doorsill beam and a left B column; the ninth vertical closed-loop structure 29 is formed by enclosing a right column A, a right column B, a right threshold and a right column A lower beam, and the tenth vertical closed-loop structure 30 is formed by enclosing a right top cover boundary beam, a right column C lower joint beam, a right threshold and a right column B.

Further, as shown in fig. 2, the floor frame, the left side plate frame, the right side plate frame and the roof frame of the main frame of the vehicle body enclose in the vertical direction to form two annular closed structures, namely an eleventh vertical closed-loop structure 31 and a twelfth vertical closed-loop structure 32. The eleventh vertical closed-loop structure 31 is formed by enclosing a left B column, a right B column, a front floor second cross beam and a skylight cross beam, and the twelfth vertical closed-loop structure 32 is formed by enclosing a top cover cross beam, a left C column, a right C column, a left C column lower joint beam, a right C column lower joint beam and a middle floor second cross beam.

In the steel-aluminum hybrid vehicle body frame structure 100 provided by the utility model, not only the vehicle body frame is formed by splicing steel-aluminum hybrid materials, but also aluminum alloy joints are arranged at a plurality of joints of the steel material and the aluminum material, and the mutual connection between the metal plate and the aluminum profile is realized through the aluminum alloy joints, so that the stability of the joints can be maintained, and the overall rigidity of the joints can be better improved.

As shown in fig. 5, a front side member joint 51 is further provided between the vehicle body main frame and the vehicle body front frame, and two front side member joints 51 are provided in the vehicle body frame, and the front side member joint 51 is provided between the front side member 52 and the rocker member 53, and connects the a-pillar 54, the cross support member 55, the cowl cross member 56, the front side member 52, and the rocker member 53 to one another. As shown in fig. 5, the front side member joint 51 connects a plurality of components into a whole, wherein the a lower pillar 54 and the inclined support beam 55 are made of sheet metal, and the front side member 52, the front lower wall cross member 56 and the threshold beam 53 are made of extruded aluminum alloy, so that the sheet metal material and the extruded aluminum alloy material can be connected into a whole by using the front side member structure 51, the overall rigidity of the front side member joint 51 can be improved, and the front side member joint 51 can realize multi-directional transmission of force during collision.

Further, as shown in fig. 6, a pair of first rear side rail joints 61 is further included between the main body frame and the rear body frame, and the two first rear side rail joints 61 are respectively disposed at two ends of the second cross member 63 of the middle floor. As shown in fig. 6, the first rear side rail joint 61 located on the left side of the middle floor second cross member 63 integrally connects the left C-pillar lower joint beam 62 and the middle floor second cross member 63. And the first rear side rail joint 61 located on the right side of the middle floor second cross member 63 connects the right C-pillar lower joint beam and the middle floor second cross member 63 integrally (not shown in the drawings). Wherein, left C post lower joint roof beam 62 is the panel beating material, and well floor second crossbeam 63 is extrusion aluminum alloy section bar.

Further, as shown in fig. 7, a second rear side member joint 71 is further included between the main body frame and the rear body frame, and the second rear side member joint 71 integrally connects a rear floor lower cross member 72, a side member extension beam 73, and a wheel house reinforcement beam 74. The rear underfloor cross member 72 and the longitudinal beam extension beam 73 are extruded aluminum alloy sections, and the wheel cover reinforcement beam 74 is made of sheet metal.

According to the steel-aluminum hybrid vehicle body frame structure 100 provided by the utility model, 19 closed-loop structures are formed in the whole vehicle body, so that the vehicle body frame forms a multi-ring cage structure, the multi-ring cage structure is more favorable for coupling of a battery pack frame, the bending rigidity and the mode of the whole vehicle body frame are improved, and the comfort of passengers and the safety performance of collision are improved; whole automobile body frame construction has adopted the frame construction of the mixed automobile body of steel aluminium of independent research and development, wherein aluminium accounts for 80% down in the automobile body structure, the steel accounts for 20%, frame roof beam among the whole closed loop construction all adopts aluminium alloy extrusion, the panel adopts punching press aluminum plate, the overlap joint transition region of going up the automobile body adopts the steel automobile body, and last automobile body has adopted the aluminum alloy to connect with a plurality of junctions of lower automobile body, under the prerequisite that satisfies automobile body frame collision security performance, the rigidity of the whole frame of automobile body can also be promoted, realize the lightweight demand of automobile body. In the steel-aluminum hybrid vehicle body frame structure 100 provided by the utility model, the torsional rigidity of the whole white vehicle body is improved by 47%, the durability test meets the equivalent 30-kilometre overlong durability verification, the weight reduction effect can be 69Kg compared with the traditional steel vehicle body, and the safety performance of the whole vehicle body reaches the C-NCAP five-star design standard.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel-aluminum hybrid vehicle body frame structure comprises a vehicle body front frame, a vehicle body main frame and a vehicle body rear frame, wherein the vehicle body main frame comprises a floor frame, a left side plate frame, a right side plate frame and a top cover frame; four annular closed structures are formed on the rear frame of the vehicle body; the front frame of the vehicle body and the main frame of the vehicle body are enclosed to form two annular closed structures; form nine cyclic annular enclosed construction on the automobile body main frame, include two cyclic annular enclosed constructions that form on the floor frame of automobile body main frame, a cyclic annular enclosed construction that forms on the top cap frame of automobile body main frame two cyclic annular enclosed constructions that form on the left side board frame two cyclic annular enclosed constructions that form on the right side board frame and the floor frame of automobile body main frame the left side board frame the right side board frame with two cyclic annular enclosed constructions that form are closed in the vertical direction to the top cap frame.

2. The steel-aluminum hybrid vehicle body frame structure according to claim 1, wherein four annular closed structures formed on the front vehicle body frame are a first horizontal closed loop structure, a second horizontal closed loop structure, a first vertical closed loop structure and a second vertical closed loop structure; the first horizontal closed-loop structure is formed by enclosing a front anti-collision beam, a left front longitudinal beam, a front wall cross beam and a right front longitudinal beam; the second horizontal closed-loop structure is formed by enclosing a wind window beam, a left upper short beam, a headlamp beam, a front end module and a right upper short beam; the first vertical closed loop structure is composed of a radiator frame; the second vertical closed-loop structure is formed by enclosing a front cabin cross beam, an aluminum alloy tower seat, a left longitudinal beam, a right longitudinal beam and a front wall cross beam.

3. A steel-aluminum hybrid vehicle body frame structure as set forth in claim 2, wherein said aluminum alloy tower base bottom is fixedly connected to said left side member or said right side member, one end of said aluminum alloy tower base top is fixedly connected to said front wall cross member, and the other end of said aluminum alloy tower base top is fixedly connected to said left upper short member or said right upper short member.

4. The steel-aluminum hybrid vehicle body frame structure according to claim 2, wherein four annular closed structures formed on the rear frame of the vehicle body are respectively a third horizontal closed loop structure, a fourth horizontal closed loop structure, a third vertical closed loop structure and a fourth vertical closed loop structure; the third horizontal closed-loop structure is formed by enclosing a second middle floor cross beam, the left longitudinal beam, the right longitudinal beam and a lower rear floor cross beam; the fourth horizontal closed-loop structure is formed by enclosing a rear coaming, the left longitudinal beam, the right longitudinal beam and the lower cross beam of the rear floor; the third vertical closed-loop structure is formed by enclosing a top cover rear cross beam, a left D column, a right D column, a left wheel cover stand column, a right wheel cover stand column and the rear floor lower cross beam; and the fourth vertical closed-loop structure is formed by enclosing the top cover rear cross beam, the left frame opening beam, the right frame opening beam and the back panel beam.

5. The steel-aluminum hybrid vehicle body frame structure of claim 4, wherein two annular closed structures are formed by enclosing the front vehicle body frame and the main vehicle body frame, and are a fifth vertical closed loop structure and a sixth vertical closed loop structure respectively; the fifth vertical closed-loop structure is formed by enclosing a left A column, a right A column, a top cover front cross beam and the air window cross beam; the sixth vertical closed-loop structure is formed by enclosing the top cover front cross beam, the left A column, the right A column, the left A lower column, the right A lower column and the front wall cross beam.

6. The steel-aluminum hybrid vehicle body frame structure of claim 5, wherein the two ring-shaped closed structures formed on the floor frame of the main vehicle body frame are a fifth horizontal closed-loop structure and a sixth horizontal closed-loop structure, respectively; the fifth horizontal closed-loop structure is formed by enclosing a front wall lower cross beam, a left threshold beam, a front floor second seat cross beam and a right threshold; and the sixth horizontal closed-loop structure is formed by enclosing the front floor second seat cross beam, the left doorsill beam, the right doorsill and the middle floor second cross beam.

7. The steel-aluminum hybrid vehicle body frame structure of claim 6, wherein an annular closed structure formed on the roof frame of the main vehicle body frame is a seventh horizontal closed loop structure, and the seventh horizontal closed loop structure is enclosed by a skylight frame.

8. The steel-aluminum hybrid vehicle body frame structure according to claim 7, wherein the two annular closed structures formed on the left side plate frame are a seventh vertical closed-loop structure and an eighth vertical closed-loop structure; the seventh vertical closed-loop structure is formed by enclosing the left A column, the left B column, the left doorsill beam and the left A lower column beam; the eighth vertical closed loop structure comprises a left top cover side beam, a left C column lower joint beam, a left threshold beam and a left B column.

9. The steel-aluminum hybrid vehicle body frame structure according to claim 8, wherein the two annular closed structures formed on the right side plate frame are a ninth vertical closed-loop structure and a tenth vertical closed-loop structure; the ninth vertical closed-loop structure is formed by enclosing the right column A, the right column B, the right doorsill and a right lower column A; and the tenth vertical closed-loop structure is formed by enclosing a right top cover boundary beam, a right C column lower joint beam, the right doorsill and the right B column.

10. The steel-aluminum hybrid vehicle body frame structure according to claim 9, wherein the floor frame, the left side plate frame, the right side plate frame and the roof frame of the main vehicle body frame enclose two annular closed structures in a vertical direction, namely an eleventh vertical closed-loop structure and a twelfth vertical closed-loop structure; the eleventh vertical closed-loop structure is formed by enclosing the left B column, the right B column, a second beam of the front floor and a skylight beam; the twelfth vertical closed-loop structure is formed by enclosing a top cover beam, the left C column, the right C column, the left C column lower joint beam, the right C column lower joint beam and the middle floor second beam.