JP5118422B2 - Alligator type cross member - Google Patents

Description

  The present invention relates to an improvement of an alligator-type cross member used for a chassis frame of a vehicle such as a truck.

Conventionally, a ladder-type chassis frame in a vehicle such as a truck is fixed to both flanges and web surfaces of a pair of left and right side rails of a cross-sectional groove type extending in the longitudinal direction of the vehicle by fixing both ends of several kinds of cross members extending in the vehicle width direction. The configuration is known.
As shown in FIG. 10A, the alligator-type cross member 11 having a vertically divided structure is composed of an upper plate 12 and a pair of left and right lower plates 15 configured to be fixed to the upper plate 12. The upper plate 12 and the lower plate 15 are provided with hat-shaped grooves 13 and 16 extending in the vehicle width direction at the time of attachment to increase the strength of the plates.
The grooves 13 and 16 have a structure protruding upward as shown in FIG.
However, in the lower plate 15, when the lower mounting flange 15 c is fixed to the web surface W of the side rail, if the groove 16 protrudes upward, it interferes with the web surface W, and the lower plate 15 The side mounting flange 15c cannot be fixed to the web surface W.
Therefore, it is necessary to secure a flat surface for fixing to the lower mounting flange 15c, and the lower central portion 15a (cross section AA in FIG. 11B) and the lower end portion 15b (FIG. 11B). The groove 16 having a hat-shaped cross section seen in (B-B cross section) in FIG. 11) is flattened in the lower mounting flange 15c (refer to the EE cross section in FIG. 11B).
However, since the strength is insufficient on the flat surface, a convex portion 16a in the reverse direction (see the DD cross section in FIG. 11B) is additionally formed during the transition from the hat-shaped cross section to the flat surface. Yes. For this reason, a substantially corrugated cross section in which a downward convex portion is formed at the center of the upward convex portion is formed at the CC cross sectional position in FIG.
Thus, the cross-sectional shape of the lower plate is complicated, and the press forming process of the parts is also extra, which causes an increase in production costs and investment in the mold.
JP 2002-321640 A

  This invention was created in view of the above circumstances, and its main problem is to maintain strength as a series of groove shapes by changing the direction of the cross-sectional hat-shaped grooves formed in the lower plate, In addition, an object is to provide an alligator-type cross member for fastening a web surface, which has a simple structure and high productivity and is excellent in cost performance such as die investment.

In order to solve this problem, in the invention of claim 1,
In the alligator type cross member, which is composed of an upper plate and a lower plate fixed to the upper plate, and is fixed to the web surface of a pair of left and right side rails of a cross-sectional groove type extending in the vehicle longitudinal direction and extending in the vehicle width direction.
The upper plate and the lower plate are formed with a groove that extends in the vehicle width direction at the time of attachment and has a cross-sectional hat shape, and side edges that extend laterally on both sides along the groove .
The upper plate is formed so that the protruding direction of the groove of the upper plate faces downward, and is provided at the center in the vehicle width direction and extends horizontally, and a pair of upper sides extending in the extending direction on both sides of the upper center portion An upper end flange and a pair of upper mounting flanges that are bent downward from both ends of each upper end portion and are fixed above the web surfaces of the left and right side rails;
The lower plate is formed in a row on the lower plate with the protruding direction of the groove of the lower plate facing downward, and a lower central portion extending substantially horizontally in the vehicle width direction and outward in the vehicle width direction A lower end portion that is inclined downward, and a lower mounting flange that is bent downward from the lower end portion and is fixed below the web surface of the side rail,
The downward groove of the lower plate is externally fitted between the downward groove of the upper plate, and the side edge of the upper central portion and the side edge of the lower central portion are fixed with a fixture. It is characterized by.
In the invention of claim 2,
The lower plate consists of a pair of left and right lower plates,
Each lower plate extends horizontally with a length of half or less of the upper central portion of the upper plate and is fixed to the upper central portion, and extends outward from the lower central portion in the vehicle width direction. A lower end portion that is gradually expanded while being inclined downward, and a lower mounting flange that is bent downward from the lower end portion and is fixed to the web surface of the side rail. .
In the invention of claim 3,
The lower plate consists of a lower plate formed integrally,
A lower central portion that extends horizontally at the center and is fixed to the upper central portion, and a pair of lower sides that expand while gradually descending from both ends of the lower central portion toward the left and right in the vehicle width direction. It comprises an end portion and a lower mounting flange which is bent downward from each lower end portion and is fixed to the web surfaces of the left and right side rails.

By projecting the downward direction of the hat-shaped groove in the cross section of the lower plate, even if a series of grooves are provided on the side rail web surface, the groove protrudes to the side away from the web, so that the groove interferes with the web surface. There is no.
In addition, since only a series of cross-sectional hat-shaped grooves are formed in the lower plate, the lower member can be maintained while maintaining the cross-sectional hat-shaped shape without impairing the strength of the lower plate while having a simple shape. It can be fixed to the web surface.
As a result, the shape of the lower plate can be simplified, the pressing process can be simplified, the production cost can be reduced, and the investment in the mold can be reduced by reducing the number of necessary molds.

According to the present invention, a downward cross-section hat-shaped groove is continuously provided on the lower plate so that it can be fixed to the web surface of the side rail, and the cost can be reduced with a simple configuration.
A preferred embodiment of an alligator-type cross member of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, the alligator-type cross member 1 includes an upper plate 2 and a pair of left and right lower plates 5 and 5 fixed to the upper plate 2.
The cross member 1 has an end fixed to the web surface W at a midway position between a pair of left and right side rails S extending in the front-rear direction of the vehicle (not shown), and is stretched in the vehicle width direction.

In the case of the illustrated example, the upper plate 2 is provided at the center in the vehicle width direction and extends horizontally in the vehicle width direction, and is provided in the extending direction on both sides of the upper center portion 2a so as to be outside the vehicle width direction. A pair of upper end portions 2b, 2b having a planar shape gradually expanding in the direction, and an upper mounting flange 2c bent downward from each upper end portion 2b and fixed to the web surface of the side rail. .
In the upper central portion 2a or the upper end portion 2b of the upper plate 2, a hat-shaped groove 3 that extends in the vehicle width direction when the cross member is attached is formed.
In this embodiment, the grooves 3 of the upper plate 2 are arranged so that the protruding direction is downward.

  Next, as shown in FIG. 2 and FIG. 5, each lower plate 5 extends horizontally with a length less than half of the upper central portion 2a of the upper plate 2 and is fixed to the upper central portion 2a. A side center portion 5a, a lower end portion 5b that expands gradually from the lower center portion 5a toward the outside in the vehicle width direction, and is bent downward from the lower end portion 5b. And a lower mounting flange 5c fixed to the web surface of the side rail.

  In this embodiment, the cross-sectional hat-shaped groove extending in the vehicle width direction at the time of installation over the entire area of the lower central portion 5a, the lower end portion 5b, and the lower mounting flange 5c of the lower plate 5. 6 is formed, and the grooves 6 of the lower plate 5 are formed such that the protruding directions are all downward.

  As shown in FIG. 4, the upper plate 2 and the lower plate 5 include an upper central portion 2 a and a lower central portion 5 a, in which a downward groove 3 is formed in the downward groove 6 of the lower plate 5. The upper plate 2 and the lower plate 5 are fixed to each other at the side edge portions 4a and 7a that are fitted and extend laterally along the grooves 3 and 6 by fixing tools 8 such as rivets and bolts.

Since the lower mounting flange 5c is overlapped with the side edge portions 4c and 7c extending sideways along the groove 6 by the lower mounting flange 5c with respect to the web surface W of the side rail, the flat surfaces overlap. The end of the lower plate 5 can be fixed by a fixture 8 such as a bolt or a bolt.
In addition, the upper plate 2 may be fixed by fixing a flat upper mounting flange 2c on the web surface W with a fixture 8 such as a rivet or a bolt as in the conventional case.

FIG. 6 shows another embodiment of the alligator-type cross member 1 of the present invention.
Since the upper plate 2 is the same as that of the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

  The lower plate 5 is formed by integrally forming the pair of left and right lower plates of the first embodiment. The lower plate 5 is provided at the center in the vehicle width direction and extends in the vehicle width direction, and the lower center. A pair of lower end portions 5b 'and 5b' which are provided on both sides of the portion 5a 'and gradually expand outward in the vehicle width direction, and are bent downward from the respective lower end portions 5b' to be side rail webs. The lower mounting flange 5c ′ is fixed to the surface.

In the present embodiment, the lower center portion 5a ′, the pair of lower end portions 5b ′ and 5b ′, and the lower mounting flanges 5c ′ and 5c ′ are successively arranged in the vehicle width direction at the time of mounting. An extending cross-sectional hat-shaped groove 6 ′ is formed, and the grooves 6 ′ of the lower plate 5 ′ are all arranged downward.
The sectional shape of the lower plate 5 ′ is omitted because it conforms to the section at each position in FIG.

Further, the upper plate 2 and the lower plate 5 ′ are formed by disposing the downward groove 3 of the upper plate 2 in the downward groove 6 ′ of the lower plate 5 ′ at the upper central portion 2a and the lower central portion 5a ′. It is the same as the first embodiment in that it is fitted and fixed to the side edge portions 4a and 7a ′ extending laterally along the grooves 3 and 6 ′ by the fixtures 8 such as rivets and bolts.
The lower mounting flanges 5c and 5c are fixed to the end portions of the lower plate 5 by fixing tools 8 such as rivets and bolts, with the side edge portions 4c and 7c 'overlapping the web surfaces W of the side rails facing each other. To do.

[Reference Example 1]
Fig.7 (a) shows the reference example 1 of the alligator type cross member which is not contained in the Example of this invention.
In this reference example 1, a hat-shaped groove 3 ′ that is formed in the upper central portion 2 a of the upper plate 2 and extends in the vehicle width direction at the time of attachment is disposed so as to face upward, and the remainder is the embodiment described above. 1 has the same configuration.
On the other hand, the lower plate 5 has a pair of left and right divided structures as in the first embodiment.

  As shown in FIG. 8, the groove 3 ′ of the upper plate 2 has substantially the same width as the groove 6 of the lower plate 5 and extends along the grooves 3 ′ and 6. The widths of the side edge portions 4a and 7a of the lower central portion 5a are also set to be substantially the same.

Thus, when the upper plate 2 and the lower plate 5 are fixed, the grooves 3 'and 6 are disposed so as to face each other vertically, and the upper plate 2 that overlaps with the upper central portion 2a and the lower central portion 5a. The side member 4a and the side edge 7a of the lower plate 5 are fixed by a fixing tool 8 such as a rivet or a bolt to form the cross member 1.
Also in this case, the lower plate 5 can be fixed by the fixture 8 with the side edge portion 7c of the lower mounting flange 5c overlapped with the web surface W of the side rail.
Other configurations are the same as those of the first embodiment, and the same reference numerals are given and the description thereof is omitted.

[Reference Example 2]
FIG. 9 shows another reference example 2 of the alligator-type cross member.
Here, the upper plate 2 has the same configuration as the upper plate 2 of Reference Example 1, and has an upward groove 3 ′.
The lower plate 5 ′ has the same configuration as the integrated lower plate 5 ′ of the second embodiment.
Accordingly, the cross-sectional shapes of the upper central portion 2a and the lower central portion 5a ′ are the same as those in FIG.
The other configurations similar to those of the second embodiment and the reference example 1 are denoted by the same reference numerals, and the description thereof is omitted.

In the present invention, the configuration of the upper plate is not limited to the above embodiment, and the groove formed in the upper plate may be only the upper central portion or may extend to the upper end portion.
Furthermore, when the groove of the upper plate faces downward, it may extend to the upper mounting flange.

  In addition, it is not limited to the said Example, A various design change can be carried out according to a use in the range which does not change the summary of this invention.

It is a perspective view which shows the mounting state to the web surface of the side rail of the cross member of Example 1. FIG. FIG. 3 is an exploded perspective view of the cross member according to the first embodiment. It is a front view which shows the attachment state of the cross member of Example 1. FIG. 3 is a cross-sectional view of a cross member of Example 1. FIG. (A) is a front view of the lower side plate of Example 1, (b) is sectional drawing in each part. It is a front view which shows the attachment state of the cross member of Example 2. FIG. It is a front view which shows the attachment state of the cross member of the reference example 1. FIG. It is a front view which shows the attachment state of the cross member of the reference example 2. (A) is a front view which shows the attachment state of the cross member of a prior art example, (b) is the same sectional drawing. (A) is a front view of the lower side plate of a prior art example, (b) is sectional drawing in each part.

DESCRIPTION OF SYMBOLS 1 Cross member 2 Upper plate 2a Upper center part 2b Upper end part 2c Upper mounting flange 3, 3 'groove | channels 4a-4c Side edge part 5 Lower plate 5a Lower side center part 5b Lower end part 5c Lower side mounting flange 6 Groove 7a-7c Side edge 8 Fixing tool

Claims (3)

In the alligator type cross member, which is composed of an upper plate and a lower plate fixed to the upper plate, and is fixed to the web surface of a pair of left and right side rails of a cross-sectional groove type extending in the vehicle longitudinal direction and extending in the vehicle width direction.
The upper plate and the lower plate are formed with a groove that extends in the vehicle width direction at the time of attachment and has a cross-sectional hat shape, and side edges that extend laterally on both sides along the groove .
The upper plate is formed so that the protruding direction of the groove of the upper plate faces downward, and is provided at the center in the vehicle width direction and extends horizontally, and a pair of upper sides extending in the extending direction on both sides of the upper center portion An upper end flange and a pair of upper mounting flanges that are bent downward from both ends of each upper end portion and are fixed above the web surfaces of the left and right side rails;
The lower plate is formed in a row on the lower plate with the protruding direction of the groove of the lower plate facing downward, and a lower central portion extending substantially horizontally in the vehicle width direction and outward in the vehicle width direction A lower end portion that is inclined downward, and a lower mounting flange that is bent downward from the lower end portion and is fixed below the web surface of the side rail,
The downward groove of the lower plate is externally fitted between the downward groove of the upper plate, and the side edge of the upper central portion and the side edge of the lower central portion are fixed with a fixture. Alligator-type cross member characterized by The lower plate consists of a pair of left and right lower plates,
Each lower plate extends horizontally with a length of half or less of the upper central portion of the upper plate and is fixed to the upper central portion, and extends outward from the lower central portion in the vehicle width direction. A lower end portion that is gradually expanded while being inclined downward, and a lower mounting flange that is bent downward from the lower end portion and is fixed to the web surface of the side rail. The alligator-type cross member according to claim 1 . The lower plate consists of a lower plate formed integrally,
A lower central portion that extends horizontally at the center and is fixed to the upper central portion, and a pair of lower sides that expand while gradually descending from both ends of the lower central portion toward the left and right in the vehicle width direction. 2. The alligator-type cross member according to claim 1, comprising an end portion and a lower mounting flange bent downward from each lower end portion and fixed to the web surface of the left and right side rails. .

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