A driverless bus body frame and preparation method thereof

Abstract

The present invention relates to a body frame of an unmanned passenger car and a preparation method thereof, and belongs to the technical field of automobile design and manufacturing. The body frame of the unmanned passenger car of the present invention includes an upper annular closed frame located at the top, a front windshield frame located at the front end, and a rear windshield frame located at the rear end; the entire frame structure is covered with columns and crossbeams, oblique beams, and joint structures, and a lower longitudinal main ring structure is formed through a longitudinal side waist beam and front and rear crossbeam structures, and a longitudinal double main ring structure is formed with the top longitudinal main ring structure formed by the top frame side beams. The front and rear frame crossbeams of the top frame, and the corresponding left and right frame side front and rear columns, respectively, constitute a transverse double main ring structure, which greatly improves the overall rigidity and stability, and enhances the functional needs of responding to emergencies and protecting the safety of passengers.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile design and manufacture, and more specifically, to a body frame of an unmanned passenger car. Background Art

[0002] In the prior art, the body frame of a low-speed bus includes the roof, front windshield, and dashboard area, which provide a body skeleton support structure, which is not suitable for the installation of unmanned driving systems; the body frame in the prior art is usually a column support structure, which is in the form of an independent column skeleton structure, and usually requires riveting and other processes. Support columns are set on the front driver and co-driver sides and the rear row, and the middle passenger area generally provides lateral protection functions through the seat side armrests, which is insufficient in safety protection functions; and the skeleton structure cannot match the complete interior and exterior sealing and covering skin, and the passengers are greatly affected by the external environment. Summary of the invention

[0003] In order to solve the above technical problems existing in the prior art, the purpose of the present invention is to provide a body frame of an unmanned passenger car.

[0004] A first aspect of the present invention provides a body frame of an unmanned passenger vehicle, comprising an upper annular closed frame at the top, a front windshield frame at the front end, and a rear windshield frame at the rear end;

[0005] The upper annular closed frame is welded by a front crossbeam of the top frame, a rear crossbeam of the top frame, a left beam of the top frame, and a right beam of the top frame; a front vertical frame crossbeam of the top frame and a rear vertical frame crossbeam of the top frame are welded in sequence from front to back between the left beam of the top frame and the right beam of the top frame, a left frame front column and a left frame rear column extending downward are welded in sequence from front to back to the left beam of the top frame, and a right frame front column and a right frame rear column extending downward are welded in sequence from front to back to the right beam of the top frame, the front vertical frame crossbeam and the left frame front column and the right frame front column form a front U-shaped frame, and the rear vertical frame crossbeam and the left frame rear column and the right frame rear column form a rear U-shaped frame;

[0006] The top end of the front windshield frame is welded to the front end of the upper annular closed frame through the left front column of the top frame and the right front column of the top frame, and the front windshield frame is welded and fixed to the left frame front column through the left frame front upper waist beam and the left frame front waist beam, and the front windshield frame is welded and fixed to the right frame front column through the right frame front waist beam;

[0007] The top end of the rear windshield frame is welded to the front and rear ends of the upper annular closed frame through the left rear column of the top frame and the right rear column of the top frame, and the rear windshield frame is welded and fixed to the left frame rear column through the left frame rear upper waist beam and the left frame rear waist beam, and the rear windshield frame is welded and fixed to the right frame rear column through the right frame rear waist beam;

[0008] The lower parts of the left frame front column and the left frame rear column are welded by a plurality of left frame middle waist beams, and there is no connection structure between the lower parts of the right frame front column and the right frame rear column.

[0009] Among them, there are three middle waist beams of the left side frame, among which the middle waist beam of the left side frame located at the upper end is located on the same straight line as the front upper waist beam of the left side frame and the rear upper waist beam of the left side frame, and the middle waist beam of the left side frame located in the middle is located on the same straight line as the front waist beam of the left side frame and the rear waist beam of the left side frame.

[0010] Wherein, the front windshield frame includes a front windshield upper crossbeam, a front windshield lower crossbeam, a front frame lower crossbeam, a front windshield frame left pillar, a front windshield frame right pillar, a front frame left lower side beam, a front frame right lower side beam, a left frame front diagonal support pillar and a right frame front diagonal support pillar, the two ends of the front windshield upper crossbeam and the front frame lower crossbeam are respectively welded to the upper end and lower end of the front windshield frame left pillar and the front windshield frame right pillar, and the two ends of the front windshield lower crossbeam are respectively welded to the lower part of the front side surface of the front windshield frame left pillar and the front windshield frame right pillar; the front frame left lower side beam and the front frame right lower side beam are respectively welded to the two ends of the front frame lower crossbeam to provide a front joint structure, and the upper ends of the left frame front diagonal support pillar and the right frame front diagonal support pillar are respectively welded to the two ends of the front windshield upper crossbeam, and the lower ends of the left frame front diagonal support pillar and the right frame front diagonal support pillar are respectively welded to the front joint structure.

[0011] Wherein, the rear windshield frame includes an upper crossbeam of the rear windshield, a lower crossbeam of the rear windshield, a lower crossbeam of the rear frame, a left pillar of the rear window frame, a right pillar of the rear window frame, a lower side beam of the left side of the rear frame, a lower side beam of the right side of the rear frame, a rear diagonal support pillar of the left frame and a rear diagonal support pillar of the right frame, the two ends of the upper crossbeam of the rear windshield and the lower crossbeam of the rear frame are respectively welded to the upper end and the lower end of the left pillar of the rear window frame and the right pillar of the rear window frame, and the two ends of the lower crossbeam of the rear windshield are respectively welded to the lower part of the rear side surface of the left pillar of the rear window frame and the right pillar of the rear window frame; the lower side beam of the left side of the rear frame and the lower side beam of the right side of the rear frame are respectively welded to the two ends of the lower crossbeam of the rear frame to provide a rear joint structure, and the upper ends of the rear diagonal support pillars of the left frame and the right frame are respectively welded to the two ends of the upper crossbeam of the rear windshield, and the lower ends of the rear diagonal support pillars of the left frame and the right frame are respectively welded to the rear joint structure.

[0012] Among them, the front windshield lower cross beam, the left side frame front upper waist beam, the upper left side frame middle waist beam, the left side frame rear upper waist beam and the rear windshield lower cross beam are located in the same horizontal plane to form a first C-shaped structure; the right side frame front waist beam, the front frame right side lower side beam, the front frame lower cross beam, the front frame left side lower side beam, the left side frame front waist beam, the left side frame middle waist beam, the left side frame rear waist beam, the rear frame left side lower side beam, the rear frame lower cross beam, the right side lower side beam and the right side frame rear waist beam are located in the same horizontal plane to form a second C-shaped structure.

[0013] Among them, the lower ends of the left frame front column, the right frame front column, the left frame rear column and the right frame rear column all extend below the plane where the second C-shaped structure is located; the middle waist beam of the left frame located below is located below the plane where the second C-shaped structure is located.

[0014] A second aspect of the present invention provides a method for preparing a body frame of an unmanned passenger vehicle, characterized by comprising the following steps:

[0015] (1) The upper annular closed frame, the front windshield frame and the rear windshield frame are prepared by a cold-formed square tube through a welding process; wherein the upper annular closed frame is welded by a top frame front crossbeam, a top frame rear crossbeam, a top frame left beam and a top frame right beam;

[0016] (2) A front frame cross beam and a rear frame cross beam are welded in sequence from front to back between the left beam and the right beam of the top frame, a left frame front column and a left frame rear column extending downward are welded in sequence from front to back to the left beam of the top frame, and a right frame front column and a right frame rear column extending downward are welded in sequence from front to back to the right beam of the top frame, the front frame cross beam and the left frame front column and the right frame front column form a front U-shaped frame, and the rear frame cross beam and the left frame rear column and the right frame rear column form a rear U-shaped frame;

[0017] (3) The top end of the front windshield frame is welded to the front end of the upper annular closed frame through the left front column of the top frame and the right front column of the top frame, and the front windshield frame is welded and fixed to the left frame front column through the left frame front upper waist beam and the left frame front waist beam, and the front windshield frame is welded and fixed to the right frame front column through the right frame front waist beam;

[0018] (4) The top end of the rear windshield frame is welded to the front and rear ends of the upper annular closed frame through the left rear column of the top frame and the right rear column of the top frame, and the rear windshield frame is welded and fixed to the left frame rear column through the left frame rear upper waist beam and the left frame rear waist beam, and the rear windshield frame is welded and fixed to the right frame rear column through the right frame rear waist beam;

[0019] (5) The left frame front column and the lower part of the left frame rear column are welded by three left frame middle waist beams, there is no connection structure between the lower part of the right frame front column and the right frame rear column, and there are three left frame middle waist beams.

[0020] Wherein, the front windshield frame includes a front windshield upper crossbeam, a front windshield lower crossbeam, a front frame lower crossbeam, a front windshield frame left pillar, a front windshield frame right pillar, a front frame left lower side beam, a front frame right lower side beam, a left frame front diagonal support pillar and a right frame front diagonal support pillar, the two ends of the front windshield upper crossbeam and the front frame lower crossbeam are respectively welded to the upper end and lower end of the front windshield frame left pillar and the front windshield frame right pillar, and the two ends of the front windshield lower crossbeam are respectively welded to the lower part of the front side surface of the front windshield frame left pillar and the front windshield frame right pillar; the front frame left lower side beam and the front frame right lower side beam are respectively welded to the two ends of the front frame lower crossbeam to provide a front joint structure, and the upper ends of the left frame front diagonal support pillar and the right frame front diagonal support pillar are respectively welded to the two ends of the front windshield upper crossbeam, and the lower ends of the left frame front diagonal support pillar and the right frame front diagonal support pillar are respectively welded to the front joint structure.

[0021] Wherein, the rear windshield frame includes an upper crossbeam of the rear windshield, a lower crossbeam of the rear windshield, a lower crossbeam of the rear frame, a left pillar of the rear window frame, a right pillar of the rear window frame, a lower side beam of the left side of the rear frame, a lower side beam of the right side of the rear frame, a rear diagonal support pillar of the left frame and a rear diagonal support pillar of the right frame, the two ends of the upper crossbeam of the rear windshield and the lower crossbeam of the rear frame are respectively welded to the upper end and the lower end of the left pillar of the rear window frame and the right pillar of the rear window frame, and the two ends of the lower crossbeam of the rear windshield are respectively welded to the lower part of the rear side surface of the left pillar of the rear window frame and the right pillar of the rear window frame; the lower side beam of the left side of the rear frame and the lower side beam of the right side of the rear frame are respectively welded to the two ends of the lower crossbeam of the rear frame to provide a rear joint structure, and the upper ends of the rear diagonal support pillars of the left frame and the right frame are respectively welded to the two ends of the upper crossbeam of the rear windshield, and the lower ends of the rear diagonal support pillars of the left frame and the right frame are respectively welded to the rear joint structure.

[0022] Among them, the front windshield lower cross beam, the left side frame front upper waist beam, the upper left side frame middle waist beam, the left side frame rear upper waist beam and the rear windshield lower cross beam are located in the same horizontal plane to form a first C-shaped structure; the right side frame front waist beam, the front frame right side lower side beam, the front frame lower cross beam, the front frame left side lower side beam, the left side frame front waist beam, the left side frame middle waist beam, the left side frame rear waist beam, the rear frame left side lower side beam, the rear frame lower cross beam, the right side lower side beam and the right side frame rear waist beam are located in the same horizontal plane to form a second C-shaped structure; the lower ends of the left frame front pillar, the right frame front pillar, the left frame rear pillar and the right frame rear pillar all extend to below the plane where the second C-shaped structure is located; the left frame middle waist beam located below is located below the plane where the second C-shaped structure is located.

[0023] Compared with the prior art, the unmanned passenger vehicle body frame and the preparation method thereof of the present invention have the following beneficial effects:

[0024] 1. In view of the characteristics of driverless buses, the traditional frame columns are changed from supporting the roof and front windshield. The columns, crossbeams, oblique beams and joint structures cover the entire frame structure. The lower longitudinal main ring structure is formed through the longitudinal side waist beams and the front and rear crossbeam structures, and the longitudinal main ring structure formed by the top frame side beams forms a longitudinal double main ring structure. The front and rear frame crossbeams of the top frame, and the corresponding left and right frame side front and rear columns respectively, form a transverse double main ring structure, which greatly improves the overall rigidity and stability, and enhances the functional needs of responding to emergencies and protecting the safety of passengers;

[0025] 2. It is welded by the tube beam provided by the cold-bending forming process, which can realize standardized production and assembly, which is conducive to reducing the development and production cycle of the body frame and significantly reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the position of the vehicle body where the vehicle body frame of the present invention is located.

[0027] Figure 2 It is a left view of the body frame of the driverless bus of the present invention.

[0028] Figure 3 The first side view of the body frame of the driverless bus of the present invention.

[0029] Figure 4 It is a second side view of the body frame of the driverless bus of the present invention.

[0030] Figure 5 The top frame structure diagram of the driverless bus body frame of the present invention.

[0031] Figure 6 The front windshield frame diagram of the driverless bus body frame of the present invention.

[0032] Figure 7 The figure is a rear windshield frame diagram of the driverless bus body frame of the present invention. DETAILED DESCRIPTION

[0033] The unmanned passenger vehicle body frame of the present invention will be further described below in conjunction with specific embodiments to help technicians in this field have a more complete, accurate and in-depth understanding of the technical solution of the present invention.

[0034] Example 1

[0035] like Figure 1-7 As shown, Figure 3Taking the front direction of the vehicle as the reference, the body frame of the driverless bus of this embodiment includes an upper annular closed frame located at the top, a front windshield frame located at the front end, and a rear windshield frame located at the rear end. The upper annular closed frame is welded by a top frame front crossbeam 34, a top frame rear crossbeam 35, a top frame left beam 36, and a top frame right beam 37. A top frame front frame crossbeam 38 and a top frame rear frame crossbeam 39 are welded in sequence from front to back between the top frame left beam 36 and the top frame right beam 37. The top frame left beam 36 is welded in sequence from front to back to the left frame front column 13 and the left frame rear column 15 extending downward, and the top frame right beam 37 is welded in sequence from front to back to the right frame front column 14 and the right frame rear column 16 extending downward. The front frame cross beam 38 and the left frame front column 13 and the right frame front column 14 form a front U-shaped frame, and the rear frame cross beam 39 and the left frame rear column 15 and the right frame rear column 16 form a rear U-shaped frame. The top end of the front windshield frame is welded to the front end of the upper annular closed frame through the left front column 29 of the top frame and the right front column 30 of the top frame, and the front windshield frame is welded and fixed to the left frame front column 13 through the left frame front upper waist beam 17 and the left frame front waist beam 25, and the front windshield frame is welded and fixed to the right frame front column 14 through the right frame front waist beam 26; the top end of the rear windshield frame is welded to the front end of the upper annular closed frame through the left rear column 31 of the top frame and the right rear column 32 of the top frame, and the rear windshield frame is welded and fixed to the left frame rear column 15 through the left frame rear upper waist beam 18 and the left frame rear waist beam 27, and the rear windshield frame is welded and fixed to the right frame rear column 16 through the right frame rear waist beam 28. The lower parts of the left frame front column 13 and the left frame rear column 15 are welded by a plurality of left frame middle waist beams 33, and there is no connection structure between the lower parts of the right frame front column 14 and the right frame rear column 16. The left frame middle waist beams 33 can be designed to be three, wherein the left frame middle waist beam 33 located at the upper end is located on the same straight line as the left frame front upper waist beam 17 and the left frame rear upper waist beam 18, and the left frame middle waist beam 33 located in the middle is located on the same straight line as the left frame front waist beam 25 and the left frame rear waist beam 27.

[0036] like Figure 5 As shown, a first reinforcing cross beam is also arranged between the front end and the rear end between the left beam 36 of the top frame and the right beam 37 of the top frame, and two connecting longitudinal beams are symmetrically arranged between the first reinforcing cross beams, and a second connecting cross beam is also arranged between the two connecting longitudinal beams.

[0037] like Figure 6As shown, the front windshield frame includes a front windshield upper crossbeam 1, a front windshield lower crossbeam 3, a front frame lower crossbeam 19, a front windshield frame left pillar 5, a front windshield frame right pillar 6, a front frame left lower side beam 21, a front frame right lower side beam 22, a left frame front diagonal support pillar 9 and a right frame front diagonal support pillar 10, the two ends of the front windshield upper crossbeam 1 and the front frame lower crossbeam 19 are respectively welded to the upper end and lower end of the front windshield frame left pillar 5 and the front windshield frame right pillar 6, and the two ends of the front windshield lower crossbeam 3 are respectively welded to the lower part of the front side surface of the front windshield frame left pillar 5 and the front windshield frame right pillar 6. The left side lower beam 21 of the front frame and the right side lower beam 22 of the front frame are respectively welded to the two ends of the front frame lower cross beam 19 to provide a front joint structure, and the upper ends of the left side frame front diagonal support column 9 and the right side frame front diagonal support column 10 are respectively welded to the two ends of the front windshield upper cross beam 1, and the lower ends of the left side frame front diagonal support column 9 and the right side frame front diagonal support column 10 are respectively welded to the front joint structure.

[0038] like Figure 7 As shown, the rear windshield frame includes a rear windshield upper crossbeam 2, a rear windshield lower crossbeam 4, a rear frame lower crossbeam 20, a rear window frame left pillar 7, a rear window frame right pillar 8, a rear frame left lower side beam 23, a rear frame right lower side beam 24, a left frame rear diagonal support column 11 and a right frame rear diagonal support column 12, the two ends of the rear windshield upper crossbeam 2 and the rear frame lower crossbeam 20 are respectively welded to the upper end and lower end of the rear window frame left pillar 7 and the rear window right pillar 8, and the two ends of the rear windshield lower crossbeam 4 are respectively welded to the lower part of the rear side surface of the rear window frame left pillar 7 and the rear window right pillar 8. The left side lower beam 23 and the right side lower beam 24 of the rear frame are respectively welded to the two ends of the rear frame lower cross beam 20 to provide a rear joint structure, and the upper ends of the left side frame rear diagonal support column 11 and the right side frame rear diagonal support column 12 are respectively welded to the two ends of the rear windshield upper cross beam 2, and the lower ends of the left side frame rear diagonal support column 11 and the right side frame rear diagonal support column 12 are respectively welded to the rear joint structure.

[0039] The front windshield lower crossbeam 3, the left side frame front upper waist beam 17, the upper left side frame middle waist beam 33, the left side frame rear upper waist beam 18 and the rear windshield lower crossbeam 4 are located in the same horizontal plane to form a first C-shaped structure; the right side frame front waist beam 26, the front frame right side lower beam 22, the front frame lower crossbeam 19, the front frame left side lower beam 21, the left side frame front waist beam 25, the left side frame middle waist beam 33, the left side frame rear waist beam 27, the rear frame left side lower beam 23, the rear frame lower crossbeam 20, the right side lower beam 24 and the right side frame rear waist beam 28 are located in the same horizontal plane to form a second C-shaped structure. The lower ends of the left frame front pillar 13, the right frame front pillar 14, the left frame rear pillar 15 and the right frame rear pillar 16 all extend below the plane where the second C-shaped structure is located. The left frame middle waist beam 33 located below is located below the plane where the second C-shaped structure is located.

[0040] Each part of the body frame of the driverless bus of this embodiment is formed by welding cold-bent square tubes, which can achieve standardized production. Specifically, the following steps are included:

[0041] (1) The upper annular closed frame, the front windshield frame and the rear windshield frame are prepared by a cold-formed square tube through a welding process; wherein the upper annular closed frame is welded by a top frame front crossbeam, a top frame rear crossbeam, a top frame left beam and a top frame right beam;

[0042] (2) A front frame cross beam and a rear frame cross beam are welded in sequence from front to back between the left beam and the right beam of the top frame, a left frame front column and a left frame rear column extending downward are welded in sequence from front to back to the left beam of the top frame, and a right frame front column and a right frame rear column extending downward are welded in sequence from front to back to the right beam of the top frame, the front frame cross beam and the left frame front column and the right frame front column form a front U-shaped frame, and the rear frame cross beam and the left frame rear column and the right frame rear column form a rear U-shaped frame;

[0043] (3) The top end of the front windshield frame is welded to the front end of the upper annular closed frame through the left front column of the top frame and the right front column of the top frame, and the front windshield frame is welded and fixed to the left frame front column through the left frame front upper waist beam and the left frame front waist beam, and the front windshield frame is welded and fixed to the right frame front column through the right frame front waist beam;

[0044] (4) The top end of the rear windshield frame is welded to the rear end of the upper annular closed frame through the left rear column of the top frame and the right rear column of the top frame, and the rear windshield frame is welded and fixed to the left frame rear column through the left frame rear upper waist beam and the left frame rear waist beam, and the rear windshield frame is welded and fixed to the right frame rear column through the right frame rear waist beam;

[0045] (5) The left frame front column and the lower part of the left frame rear column are welded by three left frame middle waist beams, there is no connection structure between the lower part of the right frame front column and the right frame rear column, and there are three left frame middle waist beams.

[0046] The body frame of the driverless bus of the present embodiment is designed as a frame-cage structure, which changes the purpose of traditional skeleton columns to provide support for the roof and the front windshield (integral support of the front frame and the rear frame), and significantly enhances the lateral and longitudinal stability; the front and rear frames are respectively a tic-tac-toe structure of the front frame and the rear frame, providing a bonding surface for the front and rear window frames, and at the same time providing an end structure for the extension section frame connection and welding it to the U-shaped structure, and double columns and a transverse main ring of the top cross beam are respectively arranged on the left and right sides of the U-shaped structure to improve the lateral stability; left and right waist beams are added to the middle passenger side area, which completely cover the passenger area longitudinally, and form a longitudinal closed loop with the front and rear frame end joints, thereby improving the rigidity and stability, providing effective protection against frontal and lateral side collisions, and the body frame can provide a complete external covering skin support structure; the body frame of the driverless bus of the present embodiment can flexibly match the internal and external shapes, and is suitable for the market demand for driverless buses in different scenarios.

[0047] For ordinary technicians in this field, the specific embodiments are only illustrative descriptions of the present invention. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A body frame of an unmanned passenger car, comprising an upper annular closed frame at the top, a front windshield frame at the front end, and a rear windshield frame at the rear end; characterized in that: The upper annular closed frame is welded by a front crossbeam of the top frame, a rear crossbeam of the top frame, a left beam of the top frame, and a right beam of the top frame; a front vertical frame crossbeam of the top frame and a rear vertical frame crossbeam of the top frame are welded in sequence from front to back between the left beam of the top frame and the right beam of the top frame, a left frame front column and a left frame rear column extending downward are welded in sequence from front to back to the left beam of the top frame, and a right frame front column and a right frame rear column extending downward are welded in sequence from front to back to the right beam of the top frame, the front vertical frame crossbeam and the left frame front column and the right frame front column form a front U-shaped frame, and the rear vertical frame crossbeam and the left frame rear column and the right frame rear column form a rear U-shaped frame; The top end of the front windshield frame is welded to the front end of the upper annular closed frame through the left front column of the top frame and the right front column of the top frame, and the front windshield frame is welded and fixed to the left frame front column through the left frame front upper waist beam and the left frame front waist beam, and the front windshield frame is welded and fixed to the right frame front column through the right frame front waist beam; The top end of the rear windshield frame is welded to the rear end of the upper annular closed frame through the left rear column of the top frame and the right rear column of the top frame, and the rear windshield frame is welded and fixed to the left frame rear column through the left frame rear upper waist beam and the left frame rear waist beam, and the rear windshield frame is welded and fixed to the right frame rear column through the right frame rear waist beam; The lower parts of the left frame front column and the left frame rear column are welded by a plurality of left frame middle waist beams, and there is no connection structure between the lower parts of the right frame front column and the right frame rear column; There are three middle waist beams of the left frame, wherein the middle waist beam of the left frame located at the upper end is located on the same straight line as the front upper waist beam of the left frame and the rear upper waist beam of the left frame, and the middle waist beam of the left frame located in the middle is located on the same straight line as the front waist beam of the left frame and the rear waist beam of the left frame; The front windshield frame comprises a front windshield upper crossbeam, a front windshield lower crossbeam, a front frame lower crossbeam, a front windshield frame left pillar, a front windshield frame right pillar, a front frame left lower side beam, a front frame right lower side beam, a left frame front diagonal support pillar and a right frame front diagonal support pillar, the two ends of the front windshield upper crossbeam and the front frame lower crossbeam are respectively welded to the upper end and lower end of the front windshield frame left pillar and the front windshield frame right pillar, and the two ends of the front windshield lower crossbeam are respectively welded to the lower part of the front side surface of the front windshield frame left pillar and the front windshield frame right pillar; the front frame left lower side beam and the front frame right lower side beam are respectively welded to the two ends of the front frame lower crossbeam to provide a front joint structure, and the upper ends of the left frame front diagonal support pillar and the right frame front diagonal support pillar are respectively welded to the two ends of the front windshield upper crossbeam, and the lower ends of the left frame front diagonal support pillar and the right frame front diagonal support pillar are respectively welded to the front joint structure; The rear windshield frame comprises an upper crossbeam of the rear windshield, a lower crossbeam of the rear windshield, a lower crossbeam of the rear frame, a left pillar of the rear window frame, a right pillar of the rear window frame, a lower side beam of the left side of the rear frame, a lower side beam of the right side of the rear frame, a rear diagonal support pillar of the left frame and a rear diagonal support pillar of the right frame, the two ends of the upper crossbeam of the rear windshield and the lower crossbeam of the rear frame are respectively welded to the upper end and the lower end of the left pillar of the rear window frame and the right pillar of the rear window frame, and the two ends of the lower crossbeam of the rear windshield are respectively welded to the rear lower part of the left pillar of the rear window frame and the right pillar of the rear window frame; the lower side beam of the left side of the rear frame and the lower side beam of the right side of the rear frame are respectively welded to the two ends of the lower crossbeam of the rear frame to provide a rear joint structure, and the upper ends of the rear diagonal support pillars of the left frame and the right frame are respectively welded to the two ends of the upper crossbeam of the rear windshield, and the lower ends of the rear diagonal support pillars of the left frame and the right frame are respectively welded to the rear joint structure.

2. The unmanned passenger vehicle body frame according to claim 1, characterized in that: The front windshield lower cross beam, the left side frame front upper waist beam, the upper left side frame middle waist beam, the left side frame rear upper waist beam and the rear windshield lower cross beam are located in the same horizontal plane to form a first C-shaped structure; the right side frame front waist beam, the front frame right side lower beam, the front frame lower cross beam, the front frame left side lower beam, the left side frame front waist beam, the left side frame middle waist beam, the left side frame rear waist beam, the rear frame left side lower beam, the rear frame lower cross beam, the right side lower beam and the right side frame rear waist beam are located in the same horizontal plane to form a second C-shaped structure.

3. The unmanned passenger vehicle body frame according to claim 2, characterized in that: The lower ends of the left frame front column, the right frame front column, the left frame rear column and the right frame rear column all extend below the plane where the second C-shaped structure is located; the left frame middle waist beam located below is located below the plane where the second C-shaped structure is located.

4. A method for preparing a body frame of an unmanned passenger vehicle, characterized in that The method comprises the following steps: (1) The upper annular closed frame, the front windshield frame and the rear windshield frame are prepared by a cold-formed square tube through a welding process; wherein the upper annular closed frame is welded by a top frame front crossbeam, a top frame rear crossbeam, a top frame left beam and a top frame right beam; (2) A front frame cross beam and a rear frame cross beam are welded in sequence from front to back between the left beam and the right beam of the top frame, a left frame front column and a left frame rear column extending downward are welded in sequence from front to back to the left beam of the top frame, and a right frame front column and a right frame rear column extending downward are welded in sequence from front to back to the right beam of the top frame, the front frame cross beam and the left frame front column and the right frame front column form a front U-shaped frame, and the rear frame cross beam and the left frame rear column and the right frame rear column form a rear U-shaped frame; (3) The top end of the front windshield frame is welded to the front end of the upper annular closed frame through the left front column of the top frame and the right front column of the top frame, and the front windshield frame is welded and fixed to the left frame front column through the left frame front upper waist beam and the left frame front waist beam, and the front windshield frame is welded and fixed to the right frame front column through the right frame front waist beam; (4) The top end of the rear windshield frame is welded to the rear end of the upper annular closed frame through the left rear column of the top frame and the right rear column of the top frame, and the rear windshield frame is welded and fixed to the left frame rear column through the left frame rear upper waist beam and the left frame rear waist beam, and the rear windshield frame is welded and fixed to the right frame rear column through the right frame rear waist beam; (5) The left frame front column and the lower part of the left frame rear column are welded by three left frame middle waist beams, there is no connection structure between the lower part of the right frame front column and the right frame rear column, and there are three left frame middle waist beams; The front windshield frame comprises a front windshield upper crossbeam, a front windshield lower crossbeam, a front frame lower crossbeam, a front windshield frame left pillar, a front windshield frame right pillar, a front frame left lower side beam, a front frame right lower side beam, a left frame front diagonal support pillar and a right frame front diagonal support pillar, the two ends of the front windshield upper crossbeam and the front frame lower crossbeam are respectively welded to the upper end and lower end of the front windshield frame left pillar and the front windshield frame right pillar, and the two ends of the front windshield lower crossbeam are respectively welded to the lower part of the front side surface of the front windshield frame left pillar and the front windshield frame right pillar; the front frame left lower side beam and the front frame right lower side beam are respectively welded to the two ends of the front frame lower crossbeam to provide a front joint structure, and the upper ends of the left frame front diagonal support pillar and the right frame front diagonal support pillar are respectively welded to the two ends of the front windshield upper crossbeam, and the lower ends of the left frame front diagonal support pillar and the right frame front diagonal support pillar are respectively welded to the front joint structure; The rear windshield frame comprises an upper crossbeam of the rear windshield, a lower crossbeam of the rear windshield, a lower crossbeam of the rear frame, a left pillar of the rear window frame, a right pillar of the rear window frame, a lower side beam of the left side of the rear frame, a lower side beam of the right side of the rear frame, a rear diagonal support pillar of the left frame and a rear diagonal support pillar of the right frame, the two ends of the upper crossbeam of the rear windshield and the lower crossbeam of the rear frame are respectively welded to the upper end and the lower end of the left pillar of the rear window frame and the right pillar of the rear window frame, and the two ends of the lower crossbeam of the rear windshield are respectively welded to the lower part of the rear side surface of the left pillar of the rear window frame and the right pillar of the rear window frame; the lower side beam of the left side of the rear frame and the lower side beam of the right side of the rear frame are respectively welded to the two ends of the lower crossbeam of the rear frame to provide a rear joint structure, and the upper ends of the rear diagonal support pillars of the left frame and the right frame are respectively welded to the two ends of the upper crossbeam of the rear windshield, and the lower ends of the rear diagonal support pillars of the left frame and the right frame are respectively welded to the rear joint structure.

5. The method for preparing the body frame of an unmanned passenger vehicle according to claim 4, characterized in that: The front windshield lower cross beam, the left side frame front upper waist beam, the upper left side frame middle waist beam, the left side frame rear upper waist beam and the rear windshield lower cross beam are located in the same horizontal plane to form a first C-shaped structure; the right side frame front waist beam, the front frame right side lower side beam, the front frame lower cross beam, the front frame left side lower side beam, the left side frame front waist beam, the left side frame middle waist beam, the left side frame rear waist beam, the rear frame left side lower side beam, the rear frame lower cross beam, the right side lower side beam and the right side frame rear waist beam are located in the same horizontal plane to form a second C-shaped structure; the lower ends of the left frame front pillar, the right frame front pillar, the left frame rear pillar and the right frame rear pillar all extend below the plane where the second C-shaped structure is located.

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