JP2534063Y2 - Car body frame structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile body frame structure.

[0002]

2. Description of the Related Art Conventionally, a chassis frame (press frame) formed by press molding has been used in a body frame structure of an automobile (truck or the like) for carrying luggage or the like. So, in the case of this type of body frame,
The frame is divided into two or three parts due to restrictions on the manufacturing of the press die, and these divided frames are connected to each other by spot welding.

[0003]

However, in the above-described conventional body frame structure, the bending stress and the like during the running of the vehicle are found in the vicinity of the frame connection part (particularly where the cross-sectional dimensions change suddenly) due to the layout. When the torsional stress acts, the stress concentrates on the relevant portion, and the vehicle body frame is broken. In addition, depending on the destination of the vehicle, excessive loading of luggage and the like is generally performed, so that stress concentration near the frame connecting portion is likely to occur, which may be a particular problem.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a vehicle body frame structure capable of reducing stress concentration near a frame connecting portion.

[0005]

In order to solve the above-mentioned problems of the prior art, according to the present invention, cross sections having different vertical cross-sectional dimensions and lateral cross-sectional dimensions are provided on both left and right sides of the vehicle body.
URN with disposing the U-shaped rear frame and the center frame to connect the front and rear ends of the two frames to each other, the vertical cross-sectional dimensions and lateral width in the vicinity of the frame connecting portion
In a vehicle body frame structure having a varying cross-sectional dimension, a center frame located near the frame connection portion is provided.
The upper and lower cross-sectional dimensions of the rear frame
And the entire frame is connected inside the frame connection part.
The section has a substantially U-shaped cross section that extends almost linearly in the longitudinal direction.
The reinforcement is arranged along the longitudinal direction of the vehicle,
The body more than the frame connection of reinforcement
Place the rear frame on both sides and bottom of the rear
To the inner peripheral surface of the
Of the position corresponding to the frame connection part of the force
Both sides and bottom of the middle part are together with the center frame
To the inner peripheral surface of the rear frame,
Than the frame connection of the reinforcement
Only the center sides of the front part located at the front of the vehicle
By integrally fixed to both side surfaces of the over arm, the Li
Of the front frame of the center frame
It is located away from the bottom .

[0006]

In the vehicle body frame structure according to the present invention,
Cross-section almost U with different vertical and horizontal cross-sectional dimensions
Character-shaped rear frame and center frame.
Above the center frame located near these frame connections
The lower cross-sectional dimension is larger than the upper and lower cross-sectional dimensions of the rear frame.
And the whole shape is long inside the frame connection part.
Leaf with a substantially U-shaped cross section that extends almost linearly in the hand direction
Position the reinforcement along the longitudinal direction of the vehicle,
Behind the body connection than the frame connection of the force
Position both sides and the bottom of the rear part
In addition to being integrally fixed to the inner peripheral surface, the lean for
Intermediate part of the position corresponding to the frame connection part
The both sides and the bottom of the
It is integrally fixed to the inner peripheral surface of the rear frame.
Front of the vehicle body than the frame connection part of the reinforcement
Of the center frame only
By integrally fixing to both sides, the lean
Position the bottom of the front part of the
Because it is arranged at a distance , the upper and lower cross-sectional dimensions and the left
It becomes possible to disperse bending stress and torsional stress in the vicinity of the frame connection where the right width cross-sectional dimension is changed during running of the vehicle, and it is possible to reduce stress concentration near the frame connection.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

FIGS. 1 to 5 show an embodiment of a vehicle body frame structure according to the present invention. This body frame structure is employed in an automobile such as a truck for carrying luggage, and a body frame 1 in the figure is divided into a main body, a rear frame 2, a center frame 3 and a front frame (not shown). It is configured. Then
A rear frame 2 and a center frame 3 are disposed on the left and right sides of the vehicle body along the vehicle front-rear direction, respectively. The front and rear ends of the frames 2 and 3 are connected to each other by spot welding.

[0009] The rear frame 2 and the center frame 3 is integrally molded by using a press-type, both left and right side end portions with bent at a right angle upward, sectional substantially U-formed by bending an upper end further perpendicularly outward It is formed in a shape. Vertical cross-sectional dimension and the rear frame 2 and the center frame 3 Oyo
The rear end of the center frame 3 is inserted into the front end of the rear frame 2 and overlapped, and the overlapped portion is fixed by spot welding to form a frame connection portion A.
Is composed. In the vicinity of the frame connecting portion A, the vertical cross-sectional dimension and the horizontal cross-sectional dimension are changed due to the layout. The vertical cross- sectional dimension of the center frame 3 located on the front side of the vehicle body is larger than the vertical cross-sectional dimension of the rear frame 2. Is formed.

A reinforcement 4 having a substantially U -shaped cross section is mounted in the frame connecting portion A and in the vicinity of the frame connecting portion along the longitudinal direction of the vehicle body. For this reason, as shown in FIGS. 1 and 2, the reinforcement 4 uses a single longitudinal steel plate whose overall shape is longer than the front-rear length of the frame connecting portion A, and presses the left and right end portions upward with a press die. By being bent at a right angle, it is integrally formed into a sectional shape corresponding to the rear frame 2 and the center frame 3, and extends almost linearly in the longitudinal direction.

As shown in FIG. 3, both side surfaces and a bottom surface of a rear portion 4a of the reinforcement 4 located rearward of the frame connecting portion A of the vehicle body are integrated with the inner peripheral surface of the rear frame 2 by spot welding. Fixed. Also,
As shown in FIG. 4, both sides and a bottom surface of the intermediate portion 4b at a position corresponding to the frame connection portion A of the reinforcement 4 are integrally formed with the center frame 3 on the inner peripheral surface of the rear frame 2 by spot welding. Fixed. further,
As shown in FIG. 5, the front portion 4c of the reinforcement 4 located on the front side of the vehicle body with respect to the frame connection portion A is formed on both sides thereof.
Only the surface is integrally fixed to both opposing side surfaces of the center frame 3 by spot welding.

That is, the front part of the reinforcement 4
4c is not the shape along the bottom of the center frame 3,
The front portion 4c is disposed so as to protrude almost linearly toward the center frame 3, and the bottom surface of the front portion 4c is provided at a position separated from the bottom surface of the center frame 3. In addition, the left and right sides of the front portion 4c of the reinforcement 4 are fixed to both sides near the upper and lower neutral axes of the center frame 3, so that the stress applied to the front and rear two spot welds 5 does not increase. It is configured as follows. A frame cover 6 is fixed to the upper surfaces of the rear frame 2 and the center frame 3 by spot welding, and the upper surfaces of the frames 2 and 3 are covered with the frame cover 6.

In the vehicle body frame structure of this embodiment,
Cross section substantially U mounted inside frame connection part A
The bottom of the front 4c of-shaped reinforcement 4 is a cross-sectional ho
Since it is provided above the bottom surface of the U-shaped center frame 3, when a bending stress or a torsional stress is applied to the vehicle body frame 1 during running of the vehicle, the stress is generated near the frame connection portion A. Not only the point B of the center frame 3 where the vertical cross section and the left and right width cross sectional dimensions change,
This also applies to the joint between the front part 4c of the reinforcement 4 and the center frame 3, so that stress concentration at the location B of the center frame 3 can be reduced by stress dispersion. In addition, since the front part 4c of the reinforcement 4 is provided near the upper and lower neutral axes of the center frame 3,
The stress on the spot welds 5 is not too high, and a good body frame structure can be provided.

Further, the reinforcement 4 of the present embodiment.
Is a state in which the entire shape is substantially linear, the front part 4c is not along the bottom surface of the center frame 3, and the positions of the front and rear parts 4a, 4c are slightly shifted toward the front side or the rear side of the vehicle body. Since the same action is exerted even if it is mounted with the, the degree of freedom in layout can be increased and the mold structure can be simplified.

In the above, one embodiment of the present invention has been described.
This invention rather than be of limited to above-described embodiments, but may be various modifications and changes based on the technical concept of the present invention.

[0016]

As described above, in the vehicle body frame structure according to the present invention, the upper and lower cross-sectional dimensions and the right and left width cross-sectional dimensions are used.
And U-shaped rear frame and center
Frames, located near these frame connections
Adjust the vertical cross-section of the center frame above the rear frame.
Formed larger than the lower cross-sectional dimension,
Inside, the cross-section of the entire shape extends almost linearly in the longitudinal direction.
U-shaped reinforcement along the vehicle longitudinal direction
The reinforcement and the frame connection of the reinforcement
On both sides and the bottom of the rear part located behind the vehicle body
And fixed integrally to the inner peripheral surface of the rear frame.
The frame connection part of the reinforcement;
Center both sides and the bottom of the corresponding middle part
Together with the frame on the inner peripheral surface of the rear frame
Adheres to the frame of the reinforcement.
Only the two sides of the front part located ahead of the vehicle body from the
To be integrally fixed to both sides of the center frame
Therefore, the front bottom surface of the reinforcement is
Since it is located away from the bottom of the center frame ,
Bending stress and torsional stress occurs, such as during automobile traveling up and down
The stress does not concentrate on one point near the frame connecting portion where the cross-sectional dimension and the lateral width cross-sectional dimension change, the stress can be dispersed, and the body frame can be prevented from being cut.

Further, in the vehicle body frame structure of the present invention, since a simple reinforcement having a substantially U- shaped cross section is linearly arranged, a mold structure for processing and forming the reinforcement is simplified, and productivity is improved. The cost can be reduced and the degree of freedom in layout can be increased, so that the present invention can be applied to various body frames.

[Brief description of the drawings]

FIG. 1 is a side view showing a vehicle body frame structure according to an embodiment of the present invention.

FIG. 2 is a plan view showing a reinforcement attached to the vehicle body frame.

FIG. 3 is a sectional view taken along line CC in FIG. 1;

FIG. 4 is a sectional view taken along line DD in FIG. 1;

FIG. 5 is a sectional view taken along line EE in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Body frame 2 Rear frame 3 Center frame 4 Reinforcement 4a Rear part of reinforcement 4b Intermediate part of reinforcement 4c Front part of reinforcement A Frame connection

Claims (1)

(57) [Scope of request for utility model registration] 1. Upper and lower cross-sectional dimensions and left and right sides of a vehicle body
With the right width cross-sectional dimension to dispose the different cross-sectional substantially U-shaped rear frame and the center frame to connect the front and rear ends of the two frames to each other, the vertical cross-sectional dimensions and lateral width cross-sectional dimension of the vicinity of the frame connecting portion In a changing body frame structure of an automobile, the frame connection
The vertical cross-sectional dimensions of the center frame
Formed larger than the upper and lower cross-sectional dimensions of the
The overall shape inside the frame connection is almost linear in the longitudinal direction
The reinforcement with a substantially U-shaped cross section
Arranged along the front-rear direction, in front of the reinforcement
Both sides of the rear part located behind the vehicle body from the frame connection part
Surface and bottom are integrally fixed to the inner peripheral surface of the rear frame.
Wear and wear the reinforcement
Side and bottom of the middle part corresponding to the arm connection
The inner circumference of the rear frame together with the center frame
Surface, and the reinforcement
Of the front part located in front of the vehicle body with respect to the frame connection part
Only both sides are fixed integrally to both sides of the center frame.
By wearing, the front of the reinforcement
Place the bottom face away from the bottom face of the center frame
A body frame structure for an automobile.