JPS6345351B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle body assembly apparatus, and more particularly to a vehicle body assembly apparatus for assembling a vehicle body by assembling side members to an underbody.

A conventional vehicle body assembly apparatus of this type includes an underbody receiver and a side member holding jig. The underbody support is for holding the underbody in a predetermined position and in a predetermined condition. On the other hand, the side member holding jig receives and holds the side member that has undergone additional spot welding at the receiving position, and then moves to the assembly position to set the side member in the position where it should be attached to the underbody. It is something to do. The side members thus set are welded and assembled to the underbody using a spot welding machine to assemble the vehicle body.

However, in conventional car body assembly equipment, the underbody receiver and the side member holding jig are aligned in a fixed state, and the underbody and side member are indirectly aligned at the assembly position. Since the underbody support and side member holding jig must be set in relation to each other with great precision, the underbody and side members must be positioned in the underbody support and side member holding jig, respectively. It is necessary to support the device with high accuracy, and therefore, the operation is troublesome, and the adjustment requires a considerable amount of time and cost. This runner-up condition is particularly noticeable in the case of the type in which the side member holding jig moves between the receiving position and the assembly position as described above.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle body assembly apparatus that can easily and accurately align an underbody and a side member.

The present invention provides a vehicle body assembly apparatus for assembling a vehicle body by assembling a side member to an underbody, including: an underbody cradle for supporting the underbody in a predetermined position;
a holding jig for holding the side member in a floating state; and a holding jig disposed between the holding jig and the underbody holder, and positioning the side member at an assembly position while being held by the holding jig. It is characterized in that it includes a positioning member.

According to the vehicle body assembly apparatus according to the present invention, the side member is held in a floating state by the holding jig,
Since this side member is positioned at the assembly position with respect to the underbody by the positioning member, as long as the accuracy of this positioning member is good, the manufacturing accuracy of the holding jig itself or the side member to this holding jig can be improved. The mounting accuracy of the members may be somewhat rough, and therefore the holding jig is extremely easy to manufacture, and the side members are also extremely easy to attach to this holding jig. Furthermore,
After moving the side member to the assembly position,
Since this side member is aligned with the underbody, the accuracy when receiving the side member with the holding jig and when moving the holding jig from the receiving position to the assembly position is not a problem. Therefore, it is easy to operate and adjust, and the equipment for that purpose may be simple, resulting in a low cost overall.

Hereinafter, a vehicle body assembly apparatus according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a front view of a vehicle body assembly apparatus for three vehicle types according to an embodiment of the present invention.

In FIG. 1, reference numeral FL indicates a floor, and an underbody base 1 and a side member base 2 are provided on this floor FL, respectively. An underbody positioning jig 3 for supporting the underbody B in a fixed position is disposed on the underbody side base 1. This underbody positioning jig 3 may be the same as a conventional one, so a detailed explanation will be omitted.

On the other hand, on the side member side base 2, a rail 4 is laid which extends in a direction perpendicular to the underbody B supported on the underbody positioning jig 3. A holding jig device for the side member M is placed on this rail 4, and this holding jig device 5 is guided by the rail 4 and is indicated by a chain line in FIG. It is slidable between a receiving position and a mounting position shown in solid lines in FIG. The holding jig device 5 includes a slide table 6 placed on a rail 4 and a jig set rotatably attached to the upper end of a support column 7 provided on the slide table 6 by a rotating shaft 8. It consists of a rotating unit 9.

This rotation unit 9 is provided with three jig attachment parts 10, 11, and 12 at equal intervals, and these jig attachment parts 10, 11, and 12 are provided with side member holding jigs 13, 14, respectively. , 15 are attached in a three-dimensional floating state by floating members 16, 17, and 18. The side member holding jigs 13, 14, and 15 are used to support side members M of vehicle bodies of different vehicle types in fixed positions.

The floating members 16, 17, 18 are made of, for example, coil springs, plate springs, or torsion bars, and are attached to the top, bottom, left, right, and rear surfaces of the holding jigs 13, 14, 15. Among these floating members 16, 17, 18, holding jig 1
The floating members attached above and below No. 3, 14, and 15 give floating properties in the vertical direction (hereinafter referred to as the X direction) to the holding jig at the assembly position shown by the solid line in Fig. 1. It is. Holding jig 1
Floating members 1 provided on the left and right sides of 3, 14, 15
6, 17, and 18 provide floating properties in a direction perpendicular to the extending direction of the rail 4, that is, in the longitudinal direction of the underbody B (hereinafter, this direction will be referred to as the Y direction). The floating members 16, 17, and 18 attached to the left and right sides of the holding jig provide floating properties in the extending direction of the rail 4, that is, in the width direction of the underbody B (hereinafter, this direction is referred to as the Z direction).

A jig arm 19 for supporting the side member M in a fixed position on the holding jig 13, 14, 15 is attached to the front surface of the holding jig 13, 14, 15, or can be attached thereto. ing. This jig arm 19 is a holding jig 1 so as to be able to hold the side member M of the vehicle body of three types of vehicles.
3, 14, and 15 are of different types. In addition, holding jigs 13, 14, 15
has four horizontal positioning shafts 20, 21, 2 extending outwardly from both sides thereof as shown in FIG.
2, 23 and a vertical positioning shaft 24 extending between the shafts 22, 23.

As shown in FIG. 2, on the side of the underbody side base 1, there are two jig positioning poles 25,
26 is erected. Jig positioning pole 25
The shaft 20 provided on the holding jig 13,
Z-direction regulating brackets 27 and 28 are provided which act on the holding jig 21 to position the holding jig 13 in the Z direction. These brackets 27 and 28 are
It may be a simple block-like object.

The jig positioning pole 26 includes a Z direction regulating bracket 29 that acts on the shaft 22 of the holding jig 13 to position the holding jig 13 in the Z direction.
is provided. This bracket 29, like the brackets 27 and 28, may be simply block-shaped. The jig positioning pole 26 is also provided with an X- and Z-direction regulating bracket 30 that acts on the shaft 23 to position the holding jig 13 in the X and Z directions. This bracket 30 is a block-shaped member 30 that performs positioning in the Z direction similar to the brackets 27, 28, and 29.
a, and a block-shaped member 30b which projects horizontally from the lower part of this block-shaped member 30a and on which the shaft 23 is placed to position the holding jig 13 in the X direction. The jig positioning pole 26 is further provided with a Y-direction regulating bracket 31 that acts on the shaft 24 to position the holding jig 13 in the Y direction. This bracket 31 is disposed between the brackets 29 and 30, and has an extension portion protruding from the surface on the side of the holding jig 13 in order to align the holding jig 13 in the Y direction.

The positioning poles 25 and 26 also have clamp devices 32, 33, 34, and 35 for clamping the holding jig 13 positioned in the X, Y, and Z directions by the brackets 27 to 31 at that position.
have. As shown in FIG. 3, this clamp device 32 consists of a clamp lever 32a and a hydraulic cylinder 32b that operates the clamp lever 32a. The clamping devices 33-35 are also of the same construction.

The operation of the vehicle body assembly apparatus having the above structure will be explained.

First, the underbody B is positioned and held at a predetermined position using the underbody positioning jig 3.

On the other hand, the holding jig device 5 is arranged at a position farthest from the underbody B, that is, at a receiving position, as shown by the two-dot chain line in FIG. Next, rotate the rotating unit 9 to move the side member holding jig 13 to the first position.
It is placed facing upward as shown by the two-dot chain line in the figure. In this state, the side member M is inserted, and the jig arm 19 of the side member holding jig 13 holds the side member M in a fixed position. however,
Since the holding jig 13 is supported in a floating state by the floating member 16, the side member M is also supported in a floating state.

Next, the rotating unit 9 is rotated 90 degrees clockwise in the figure to direct the holding jig 13 holding the side member M toward the underbody B side. In this state, the holding jig device 5 is slid on the rail 4 to the assembly position shown by the solid line in FIG. The holding jig 13 held floatingly in the holding jig device 5 arranged at this assembly position is moved to the positioning brackets 27 to 31 of the positioning poles 25 and 26.
is used to position it in the X, Y, and Z directions and place it in a fixed position. As a result, the side member M held by the holding jig 13 is positioned at a fixed position relative to the underbody B supported by the jig 3, so that various spot welding devices (not shown) can be used in this state. Assemble the side member M to the underbody B using the . By repeating the above steps, the side members M are successively positioned relative to the underbody B and then assembled.

Note that C shown in FIG. 1 indicates a center line, and the above-mentioned work is performed symmetrically about this center point C.

In the vehicle body assembly apparatus of the present invention described above, the holding jig for the side member is supported in a floating state, and the positioning is performed using the positioning pole only after the holding jig is moved to the assembly position. In other words, since the side members of the vehicle body and the underbody are aligned in the final state, the mechanisms such as the moving mechanism, rotating mechanism, or stopping mechanism for the holding jig do not require much accuracy; The configuration can be simplified and positioning accuracy can be improved. In addition, even if the underbody side base and side member side base are slightly displaced vertically or horizontally due to ground subsidence or vibration in the factory, the positioning pole that mainly functions to position the side member will be on the underbody side. Since it is arranged on the base, the deviation between the two bases does not affect the accuracy of positioning during positioning. Furthermore, even when three types of holding jigs are attached to the rotating unit to assemble three types of car bodies, the positioning of each holding jig is easy for the same reason as mentioned above, and therefore only one 3 by body assembly equipment
It becomes possible to assemble the body of the vehicle.

[Brief explanation of drawings]

FIG. 1 is a front view showing a vehicle body assembly apparatus for three types of vehicle bodies according to an embodiment of the present invention, and FIG.
1, and FIG. 3 is a sectional view taken along the line - in FIG. 2. 1... Underbody side base, 2... Side body side base, 3... Underbody positioning jig, 5... Holding jig device, 13, 14, 15...
Holding jig, 16, 17, 18... floating member.

Claims (1)

[Claims] 1. In a vehicle body assembly device for assembling a vehicle body by assembling a side member to an underbody, an underbody cradle that supports the underbody in a predetermined position, and a holder that is disposed on the side of the underbody cradle and holds the side member in a floating state. A vehicle body assembly device comprising: a jig; and a positioning member disposed between the holding jig and the underbody cradle for positioning the side member at an assembly position while being held by the holding jig.