JPH06270839A - Under-carriage frame for truck or the like - Google Patents

Abstract

PURPOSE:To improve rigidity of a third portion and to improve durability and the like of an under-carriage frame by arranging a reinforcing part with the groove-shaped cross section over a part of a first and a second portions continuing front to rear from the third portion in a side rail so as to form a closed cross section part. CONSTITUTION:An under-carriage frame 10 is constituted by a pair of right and left side rails 12 and a plurality of cross members 14 arranged in the direction of the car width and fixed to each of the side rails 12 at both ends. Each of the side rails 12 is formed by a first portion 12a whose interval in the car width direction is wide, a second portion 12b whose interval in the car width direction is small and an inclined third portion 12c whose the cross section connecting them to each other is V-shaped. In this case, a reinforcing part 16 with the groove-shaped cross section is arranged over a part of the first portion 12a and the second portion 12b continuing front to rear from the third portion 12c. The reinforcing part 16 is fastened to a web l2w with a rivet 18 whereby a closed cross section part A is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chassis frame of a truck or the like.

[0002]

2. Description of the Related Art A typical structure of a chassis frame of a conventional truck is shown in a plan view of FIG. 5 showing a front half of the chassis frame, a side view of the chassis frame shown in FIG. 6, and VII- of FIG. This will be described with reference to FIG. 7 showing a cross section taken along the line VII.

In the drawings, reference numeral 10 generally indicates a chassis frame, which is a set of left and right side rails 12 extending in the front-rear direction of the vehicle body and each having a groove-shaped cross section, and arranged in the vehicle width direction. A plurality of cross members 14 are provided and both ends thereof are fixed to the side rail 12 by rivets or bolts. Undercarriage frame 10 shown
Then, the first cross member 14 arranged at the front end is made of a member having a groove-shaped cross section,
Is a so-called alligator type cross member,
Further, a third cross member or the like is arranged further back, but these cross members are not shown.

The pair of side rails 12 includes a first portion 12a having a wide space in the vehicle width direction for mounting an engine or the like,
The second portion 12b that supports the luggage carrier and has a narrow width in the vehicle width direction
And an inclined third portion 12c which connects the first portion 12a and the second portion 12b and has an inverted V-shape in a plan view.

A large vertical bending load and a torsional load are applied to the undercarriage frame 10 during traveling, particularly when traveling on a rough road or an uneven terrain, and a lateral bending load is mainly applied during turning traveling.

Due to the various loads mentioned above, especially the torsional loads,
Since the inclined third portion 12c of the side rail 12 is apt to be twisted and deformed, conventionally, the third portion 12c and a part of the first portion 12a and the second portion 12b which are continuous before and after the third portion 12c are reinforced. There is.

The general structure of the above-mentioned reinforcing portion is that the reinforcing member 16 having a groove-shaped cross section is closely inserted into the inside of the side rail 12, as shown in the sectional view of FIG. , Is fixed to the side rail 12 by rivets 18 or bolts. In many cases, the reinforcing member 16 is inserted into the inside of the side rail 12 and is replaced by two members each having an L-shaped cross section, which are arranged in close contact with the upper and lower corners.

In the above-mentioned conventional structure, the reinforcing member 16 provided over the third portion 12c of the side rail 12 and a part of the first portions 12a and 12b continuous with the third portion 12c is closely attached to the inside of the side rail 12. Since it is arranged,
Since there is only the effect of partially increasing the plate thickness of the side rails, the structure cannot sufficiently increase the rigidity, and torsional deformation easily occurs, so there is still room for improvement from the viewpoint of durability. In order to further improve the rigidity of the third portion 12c of the side rail, a method of increasing the plate thickness of the reinforcing member 16 or arranging a plurality of reinforcing members 16 in a stacked manner is usually adopted. However, each of them has a problem that the weight is significantly increased.

[0009]

SUMMARY OF THE INVENTION The present invention was devised in view of the above circumstances, and has the effect of increasing the rigidity of the third portion of the side rails of the chassis frame without causing a problem such as a significant increase in weight. It is intended to improve the durability and reliability of the chassis frame significantly.

[0010]

In order to achieve the above object, the present invention provides a vehicle width in which a pair of left and right side rails extending in the longitudinal direction of the vehicle body and each having a groove-shaped cross-section have an engine or the like mounted thereon. A first portion having a wide gap in the direction, a second portion having a narrow gap in the vehicle width direction for supporting the cargo bed and the like, and a third portion connecting the first and second portions and having a planar V-shape. An undercarriage frame for a truck or the like, characterized in that a reinforcing member is provided on the third portion of the side rail so as to cooperate with the side rail to form a closed cross-section structure. Is proposed.

[0011]

According to the present invention, the reinforcing member is arranged on the third portion of the side rail of the chassis frame so as to form the closed cross-section structure, so that the third portion of the third portion can be formed without increasing the weight. The rigidity can be greatly increased and therefore the durability of the chassis frame is improved.

[0012]

Embodiments of the present invention will be specifically described below with reference to FIGS. (Note that members and portions substantially the same as or corresponding to those of the conventional configuration described with reference to FIGS. 5 to 7 are denoted by the same reference numerals, and redundant description will be omitted.) In the first embodiment of the present invention shown in FIG. 2, in the inside of the side rail 12, the first portion 12a and the second portion 12a continuous from the third portion 12c to the front and rear thereof are provided.
A reinforcing portion 16 having a groove-shaped cross section arranged over a part of the portion 12b is fastened to a web 12w of the side rail 12 by a rivet 18 or a bolt via a hollow cylindrical spacer 20 having a stud hole at the center. A closed cross-section structure portion A is formed by 12 and the reinforcing member 16.

According to the above-mentioned structure, the inclined third portion 12c of the side rail 12 serves as the side rail and the reinforcing member 1.
Since the closed cross-section structure portion A is formed by 6 and 6, the rigidity is greatly increased by only adding a small weight of the spacer 20, and therefore the durability and reliability of the chassis frame 10 can be remarkably improved. .

Next, in a second embodiment of the present invention shown in FIG. 3, inside the side rail 12, a first portion 12a and a second portion 12 which are continuous from the third portion 12c to the front and rear of the third portion 12c.
The reinforcing member 16 arranged over part of b has a C-shaped cross-sectional shape. The reinforcing member 16 has the web 1
The upper and lower flange-up portions 16f parallel to 6w are respectively attached to the web 12w of the side rail 12 by a plurality of bolts 22.
Is stuck to. The web 16 of the reinforcing member 16
A working hole 24 for screwing a nut into the bolt 22 is provided in w.

According to this structure, since the third portion 12c of the side rail 12 forms the closed cross-section structural portion A by the side rail and the reinforcing member 16, the rigidity is greatly increased, and therefore the chassis is The durability of the frame 10 can be significantly improved.

Further, in the third embodiment of the present invention shown in FIG. 4, the third portion 12c is provided inside the side rail 12.
The first part 12a and the second part 1 which are continuous before and after
The reinforcing member 16 disposed over a part of 2b has a hat-shaped cross-sectional shape. The upper and lower flange portions 16f of the reinforcing member 16 are fastened to the web 12w of the side rail by a large number of rivets 18.

With this structure, the third portion 12c of the side rail 12 is provided with the closed cross-section structure portion A including the side rail and the reinforcing member 16, so that the rigidity of the third portion 12c is greatly increased. And therefore chassis frame 10
The durability and reliability of can be remarkably improved.

[0018]

As described above, in the chassis frame of a truck or the like according to the present invention, a pair of left and right side rails extending in the front-rear direction of the vehicle body and each having a groove-shaped cross section have an engine or the like mounted thereon. A first part having a wide space in the vehicle width direction, a second part having a narrow space in the vehicle width direction for supporting a cargo bed and the like, and a third part connecting the first and second parts and having a planar V-shape. And the third of the side rails.
A reinforcing member is arranged in the portion so as to form a closed cross-section structure in cooperation with the side rail, and the rigidity of the third portion of the side rail inclined in a V shape is
There is an advantage that the durability and reliability of the undercarriage frame can be effectively improved, because the weight can be greatly improved without sacrificing a significant weight increase or the like.

[Brief description of drawings]

FIG. 1 is a plan view of a front half portion of a chassis frame showing a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an enlarged sectional view of an essential part similar to FIG. 2, showing a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of an essential part similar to FIG. 2, showing a third embodiment of the present invention.

FIG. 5 is a plan view showing a front half portion of a conventional chassis frame.

FIG. 6 is a side view of the chassis frame shown in FIG.

7 is an enlarged cross-sectional view taken along the line VII-VII of FIG.

[Explanation of symbols]

 10 Undercarriage frame 12 Side rails 14 Cross member 16 Reinforcement member A Closed-section structure part

Claims (1)

[Claims] 1. A pair of left and right side rails extending in the front-rear direction of the vehicle body and each having a groove-shaped cross-sectional shape support a first portion for mounting an engine or the like and having a wide space in the vehicle width direction, and a loading platform or the like. A third part of the side rail in which a second part having a narrow interval in the vehicle width direction and a third part which connects the first and second parts and has a planar V-shape is provided. An undercarriage frame of a truck or the like, in which a reinforcing member is arranged so as to form a closed cross-section structure in cooperation with the side rail.