A METHOD FOR THE ASSEMBLY OF VARIOUS VERSIONS OF MOTOR-CAR BODY STRUCTURES AND BODY STRUCTURES PRODUCED BY THIS METHOD

Abstract: Various versions of motor-car bodies are assem­ bled by the provision of a standard central module (4) including a floor (5) and a framework (6, 7, 8), which form a common preassembled spatial structure for all the different versions of the body structure, and a series of different rear modules (11, 12, 13) which can be assembled with the central module (4) to produce the various versions of the body structure. The standard central module and the different rear modules are formed with mutual joining surfaces in a single plane (A).

Description: The present invention relates to a method for the assembly of various versions of motor-car body structures. In the production of motor-car bodies, the provision of a standard module including a floor and a framework, which form a preassembled partial substructure defining a central common incomplete portion for all the different versions of the body structure, and a series of different rear modules which can be assembled with and permanently connected to the standard module to produce the various versions of the body structure, is known. It is thus possible to produce body structures for two-compartment, three-compartment, two-door and four-door versions of the same type of motor car in a simplified manner. According to the prior art, described for example in EP-A-180554, the connection between the central module and the rear modules involves mutually copenetrating and interlocking parts which require extremely accurate manufacture and joining with consequent production difficulties and problems. Moreover, the rear modules usually have two lateral walls in which apertures are provided which form respective window openings for housing the relative panes of glass. According to known techniques, these apertures are open at the front and are completed during assembly by being closed by the central module. This conformation also obviously requires perfect accuracy of coupling and may moreover involve difficulties in the sealing of the side panes of glass which are subsequently fitted in the openings. The object of the present invention is to avoid these problems, and to provide a method for the assembly of motor-car body structures of the type defined, which enables the joining of the central module to the various rear modules to be made simpler and easier, and avoids the risks of unevenness and connection anomalies. In order to achieve this object, the method according to the invention is characterised in that the standard module and the different rear modules are formed with mutual joining surfaces in a single plane. By virtue of this concept, elements for the copenetration or interlocking of the modules are eliminated, so that the necessary accuracy of coupling in ensured without particular difficulty. Moreover, the method according to the invention conveniently provides for the use of rear modules provided with complete frames defining side window openings. This characteristic further simplifies the joining of the modules and avoids problems in the sealing of the panes of glass subsequently fitted to the openings. The joining plane between the modules is usually arranged obliquely. The surfaces for mutual joining of the modules are conveniently formed by respective annular flanges which are accessible from the outside of the modules for their mutual connection. A further subject of the invention is a body structure for motor cars produced by the method defined above. The invention will now be described in detail with reference to the appended drawings, provided purely by way of non-limiting example, in which: Figure 1 is a perspective view of a first version of a motor-car body structure, shown before its assembly by the method according to the invention, Figure 2 shows the body structure of Figure 1 after its assembly, Figures 3 and 4 are two views, similar to Figures 1 and 2, of a body structure for a second version of the same motor car, Figures 5 and 6 are two views, similar to Figures 1 and 2, of a body structure for a third version of the motor car, Figure 7 is a partial side elevation taken on the arrow VII of Figure 2 on an enlarged scale, Figure 8 is an exploded perspective view taken on the arrow VIII of Figure 7 on an enlarged scale, Figure 9 is a section taken on the line IX-IX of Figure 7 on an enlarged scale, Figure 10 is a section taken on the line X-X of Figure 7, on an enlarged scale, Figure 11 is a section taken on the line XI-XI of Figures 7 on an enlarged scale, Figure 12 is a section taken on the line XII-XII of Figure 7 on an enlarged scale, Figure 13 is a section taken on the line XIII-XIII of Figure 7 on an enlarged scale, Figure 14 is a section taken on the line XIV-XIV of Figure 7 on an enlarged scale, Figure 15 is a section taken on the line XV-XV of Figure 7 on an enlarged scale, Figure 16 is a section taken on the line XVI-XVI of Figure 7 on an enlarged scale, Figure 17 is a section taken on the line XVII-XVII of Figure 7 on an enlarged scale, Figure 18 is a section taken on the line XVIII-XVIII of Figure 7 on an enlarged scale, and Figure 19 is a section taken on the line XIX-XIX of Figure 7 on an enlarged scale. In the embodiment illustrated in the drawings, the method according to the invention is used to assemble various body structures which correspond to various versions of the same model of motor car: in particular, Figures 1 and 2 show a body structure 1 for the two-compartment, four-door version of the car, Figures 3 and 4 show a body structure 2 for the three-compartment, four-door version of the same car and Figures 5 and 6 show the body structure 3 for the two-compartment, two-door version of the car. According to the method which forms the subject of the present invention, the three body structures 1, 2, 3 are assembled from a standard central module 4 constituted by a pre-assembled partial structure which is common to the three body versions. The central module 4 is composed essentially of a floor 5, two side frames 6, 7 and an upper frame 8 to which a roof element 9 is fixed. In the case of the body structures shown in Figures 1, 2 and 3, 4, which relate, as stated, to the four-door versions of the car, the central module 4 also includes two intermediate side pillars 10. These pillars 10 are omitted, however, in the body structure for the two-door version shown in Figures 5 and 6. The body structures 1, 2 and 3 are completed by means of respective rear modules 11, 12 and 13, which are different for the three versions of the car. These rear modules 11, 12 and 13 however, have a common characteristic, which consists of the fact that all three are provided at the sides with respective complete frames 11a, 12a and 13a defining side window openings. According to the invention, the standard central module 4 and the different rear modules 11, 12 and 13 of the body structures 1, 2 and 3 are formed with mutual joining surfaces arranged in a single continuous plane. The line of this plane is indicated A in Figure 7, which relates to the body structure 1 of Figures 1 and 2, and also has an identical arrangement in the body versions 2 and 3 shown in Figures 3, 4 and 5, 6. As is clear from Figure 7, the joining plane A is arranged obliquely: it is defined by respective annular flanges 14, 15, which are formed in correspondence with the facing ends of the central module 4 and the rear module 11 (or 12 or 13), and are accessible from the outside after they have been placed side by side and joined during assembly by spot welding, laser welding or even by means of screws and/or gluing with structural adhesive Figure 8 shows the arrangement of the joining flanges 14 and 15 before coupling, whilst Figures 9 and 10 show these flanges after their mutual fixing in two different regions. Once the assembly of the body structure 1, 2 or 3 is completed, the bodywork of the car is completed by the addition of outer finishing panels of sheet metal or plastics material (indicated 16, for example, in Figure 10) as well as by window panes and respective weatherstrips (indicated 17 and 18 in Figures 9 and 15). Figures 11 to 14 and 16 to 19 show the way in which the central module 4 and the finishing panels 16 (of sheet metal or plastics material) are connected in different regions of the body structure 1 of Figure 7. It is clear from the above description that the method according to the invention enables various versions of motor-car body structures to be produced extremely simply and easily, particularly by virtue of the fact that the joining of the modules in a single coupling plane and therefore without parts for the copenetration and interlocking of the modules, enables the necessary accuracy of joining to be achieved easily.

Claims: 1. A method for the assembly of various versions of motor-car body structures, consisting of the provision of a standard module (4) including a floor and a framework, which from a pre-assembled partial substructure defining a central common incomplete portion for all the various versions of the body structure, and a series of different rear modules (11, 12, 13) which can be assembled with and permanently connected to the standard module (4) to produce the various versions of the complete body structure, characterised in that the standard module (4) and the different rear modules (11, 12, 13) are formed with mutual joining surfaces (14, 15) in a single plane (A). 2. A method according to Claim 1, characterised in that the joining plane (A) is arranged obliquely. 3. A method according to Claim 1, characterised in that rear modules (11, 12, 13) are used, which are formed with complete frames defining side window openings (11a, 12a, 13a). 4. A method according to Claim 1, characterised in that the mutual joining surfaces (14, 15) are defined by respective annular flanges which are accessible from the outside of the modules (4; 11, 12, 13) for their mutual connection. 5. A body structure for various versions of motor car, comprising a standard module (4) including a floor and a framework, which form a pre-assembled partial substructure defining a central common incomplete portion for all the various versions of the body structure, and a series of different rear modules (11, 12, 13) which can be assembled with and permanently connected to the standard module (4) to produce the various versions of the complete body structure, characterised in that the standard module (4) and the different rear modules (11, 12, 13) are formed with mutual joining surfaces (14, 15) in a single plane (A). 6. A structure according to Claim 5, characterised in that the rear modules (11, 12, 13) are formed with complete frames defining side window openings (11a, 12a, 13a). 7. A structure according to Claim 5, characterised in that the joining plane (A) is arranged obliquely. 8. A structure according to Claim 5, characterised in that the mutual joining surfaces are formed by respective annular flanges (14, 15) which are accessible from the outside of the modules (4; 11, 12, 13) for their mutual connection.

Inventors: GORIA, ALDO
Applicants: FIAT AUTO S.P.A.
Application year: 1989
Main classification: B62D65
IPC codes: B62D65