JP2003226260A - Panel type subframe for vehicle, vehicle equipped with the same and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight panel type subframe for a vehicle and a manufacturing method thereof capable of exhibiting high strength and rigidity. <P>SOLUTION: This subframe A1 is provided with a base part 10 having first and second components 11 and 11 in a shape of a rod arranged so as to form a predetermined angle or to be separated almost in parallel to each other. A plate shaped third component 20 is arranged so as to close a space 13 between the first component 11 and the second component 11. The third component 20 is fixed on the base part 10 by fusion welding or solid phase jointing. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel type subframe of a vehicle preferably used as a front subframe or a rear subframe in a vehicle such as an automobile, a vehicle provided with the panel type subframe and a panel type subframe of the vehicle Regarding the method.

[0002]

2. Description of the Related Art In an automobile, for example, a front subframe is disposed between the left and right front wheels of a vehicle body and supports an engine, a transmission device, a suspension device and the like. On the other hand, the rear subframe is arranged between the left and right rear wheels of the vehicle body and supports the rear differential device, the suspension device, and the like.

A conventional subframe of this type is generally made of steel such as iron. Such a steel subframe has an advantage that it can be manufactured at low cost, but
It had the drawback of being heavy.

Therefore, in order to reduce the weight of the subframe, it has recently been proposed to manufacture the subframe from aluminum or its alloy.

[0005]

However, while such a subframe made of aluminum or its alloy is lightweight, it has a drawback that the manufacturing cost is increased because the material cost is high. For example, 50 subframes
When manufactured from a 00 series aluminum alloy, the weight of the sub-frame is 60 compared to the steel sub-frame.
However, there is a drawback that the manufacturing cost is increased by 80% (that is, 1.8 times). On the other hand, when the subframe is made of a 6000 series aluminum alloy, the weight of the subframe can be reduced to 50% as compared with the steel subframe, but the manufacturing cost is increased by 100% ( That is, it doubles.) Therefore, the subframe made of aluminum or its alloy has been used only in some luxury cars.

Further, since a large load is generally applied to the sub-frame, it is necessary to set the thickness and the cross-sectional area of the sub-frame to be large so as to withstand the load to increase the strength and rigidity thereof. However, if the wall thickness and the cross-sectional area of the subframe are set to be large in this way, the weight of the subframe increases and it becomes impossible to reduce the weight of the subframe.

The present invention has been made in view of the above technical background, and an object thereof is a subframe of a vehicle which is lightweight, can be manufactured at low cost, and has high strength and rigidity, and a vehicle including the subframe and a vehicle. A subframe manufacturing method is provided.

[0008]

In order to achieve the above object, the vehicle panel type sub-frames according to the first aspect of the present invention are arranged so as to form a predetermined angle with each other or are spaced apart from each other. The plate-shaped third component arranged in such a manner as to close the space between the first component and the second component is fixed to the base portion provided with the rod-shaped first and second components. (Claim 1).

In this subframe, the strength and / or rigidity of the subframe is increased by fixing the plate-shaped third component arranged in a predetermined manner to the base portion. Further, the weight increase amount due to the higher strength and the higher rigidity of the subframe can be suppressed as much as possible, and the weight of the subframe can be reduced. Further, since it is possible to increase the strength and rigidity of the subframe without increasing the wall thickness or the cross-sectional area of the subframe, it is possible to reduce the manufacturing cost of the subframe.

The fixing means of the third component to the base portion is not limited, and various fixing means such as mechanical connection, melt welding and solid phase bonding described later can be adopted. Further, in this subframe, the first constituent material and / or the second constituent material is made of, for example, a metal. In this case, the first constituent material and / or the second constituent material may be manufactured from a steel material such as iron, or may be manufactured from aluminum or an alloy thereof. Similarly, the third component is made of metal, for example. In this case, the third component may be made of steel such as iron,
It may be made of aluminum or its alloy.
Further, the third component may be configured by being divided into a plurality of parts such as front, rear, left and right. Further, the number of the third constituent members may be one or plural (for example, two).

Further, the base portion is formed by connecting at least one first constituent member and the second constituent member, and is formed into a substantially square shape as shown in an embodiment shown in the drawings. Although not shown, it may be formed in a substantially U-shape or a substantially A-shape, and the shape is not limited.

Further, in the first invention, the third component is
The space between the first component and the second component is completely (ie 1
It is desirable that the space is arranged in a closed manner (at a closed ratio of 00%), but the arrangement is not limited to this, and a part of this space may be in an open state. In particular, it is desirable that the third component is arranged so as to close this space at a closing rate of 50% or more, and further preferably be arranged so as to close the space of 70% or more.

In the sub-frame, it is preferable that the base portion is arranged in a substantially horizontal shape, and the third constituent member is arranged on a lower surface side of the base portion. 2).

In this case, since the third component is arranged on the lower surface side of the base portion, when this is applied to the vehicle,
Aerodynamic resistance value in the subframe of the vehicle is reduced,
Therefore, vehicle performance and fuel efficiency are improved. That is, on the lower surface side of the conventional subframe, there is a type in which an aerodynamic resistance reducing cover made of resin or the like is arranged in order to reduce the aerodynamic resistance value of the vehicle, but in the subframe of the present invention,
The third component can also serve as such a cover for reducing aerodynamic resistance.

In the sub-frame, it is desirable that at least a part of the third component is bent (claim 3).

In this case, it is possible to avoid an interfering object (eg, differential device, front axle, rear axle) existing at the installation location of the subframe, or / and set the aerodynamic resistance value to a desired value. be able to. In the present invention, the bent state of the third component is not limited, and for example, a part of the third component may be bent, or the entire third component may be bent. good. Moreover, the third component may be bent at one location or at a plurality of locations.

In the sub-frame, it is preferable that a part of the third component is provided with a notch for avoiding an interfering object existing at an installation place (claim 4).

In this case, it is possible to avoid an interfering object (eg, differential device, front axle, rear axle) existing at the installation location of the subframe, and to install the subframe without hitting the interfering object. it can.

Further, it is desirable that a reinforcing piece for reinforcing the third constituent member is attached to the third constituent member in such a manner as to traverse the notch (claim 5).

In this case, the third component is reinforced by the reinforcing piece, so that the strength and / or the rigidity of the subframe is further improved. The means for attaching the reinforcing piece to the third component is not particularly limited, and examples thereof include melt welding and solid phase joining.

In the sub-frame, it is desirable that the third component is provided with a reinforcing rib portion that reinforces the third component (claim 6).

In this case, the third component is reinforced by the reinforcing rib portion, so that the strength and / or the rigidity of the subframe is further improved. The reinforcing rib portion may be integrally formed on one side or both sides of the third component so as to project. Alternatively, the reinforcing rib may be a separate body from the third component and may be formed on one side or both sides of the third component. May be attached to. In this case, as the means for attaching the reinforcing rib portion to the third component,
It is not particularly limited, and examples thereof include melt welding and solid phase joining.

In the sub-frame, the third component may be provided with a joint portion which is connected to another member (claim 7).

In this case, the joint portion may be formed integrally with the third component, or it may be a separate body from the base and the third component and may be fixed to the third component by a predetermined fixing means ( (Eg, mechanical bonding, fusion welding, solid phase bonding). Further, as the joint portion, for example, it may have a bush mounting portion to which a bush such as a floating bush is mounted, or may have a ball joint mounting portion to which a ball joint is mounted, It may be York.

In the sub-frame, it is preferable that at least a part of a peripheral edge of the third component is arranged so as to project outward from the base (claim 8).

In this case, the strength and / or the rigidity of the sub-frame is further improved by the amount that at least a part of the peripheral edge portion of the third component is projected outward from the base portion.

In the sub-frame, it is desirable that the third constituent member is fixed to the base portion by mechanical bonding, fusion welding or solid phase bonding (claim 9).

In this case, the third component is securely fixed to the base portion. In this case, the types of mechanical bonding, fusion welding and solid phase bonding are not limited. Examples of the mechanical connection include rivet fastening. Examples of the fusion welding include arc welding such as MIG welding and TIG welding, and laser welding. Examples of solid-state joining include friction stir welding.

In the sub-frame, one or more constituent members selected from the group consisting of the first constituent member, the second constituent member and the third constituent member are made of aluminum or its alloy. It is desirable (claim 10).

In this case, the weight of the subframe can be further reduced. In particular, the one or more constituent materials selected from this group are preferably made of a 5000 series or 6000 series aluminum alloy, and further 60
It is desirable to use a 00 series aluminum alloy in terms of further weight reduction, higher strength and / or higher rigidity. Further, it is desirable that it is made of an extruded material of aluminum or its alloy, and further that the extruded material is hollow.
In particular, a hollow extruded material of 5000 series or 6000 series aluminum alloy is preferable.

A vehicle according to a second aspect of the invention is characterized by including the subframe (claim 11).

In this vehicle, since the sub-frame is lightweight, the fuel efficiency of the vehicle is improved.

In the method of manufacturing a vehicle sub-frame according to the third aspect of the present invention, two rod-shaped first and second sub-frames that are arranged at a predetermined angle to each other or are spaced apart from each other are provided.
It is characterized in that a plate-shaped third constituent member arranged so as to close the space between the first constituent member and the second constituent member is fixed to a base portion provided with the constituent member. 1
2).

In this panel-type subframe manufacturing method, a lightweight subframe having high strength and / or high rigidity can be obtained.

In the subframe manufacturing method, it is preferable that the third component is fixed to the base portion by mechanical bonding, fusion welding or solid phase bonding (claim 13).

In this case, the third component can be securely fixed to the base portion.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1A, (A1) is a subframe of the first embodiment. This subframe (A1)
Cars as vehicles (eg FF cars, FR cars, 4WD)
Car). In FIG. 1A, the “FR” direction of the arrow indicates the front direction of the automobile. Figure 2
Shows the state in the middle of manufacturing this subframe (A1).

This sub-frame (A1) is used as a rear sub-frame, and as shown in FIG. 1 (a), it is arranged substantially horizontally in the rear part of the vehicle body (not shown). It is attached to the car body. In the present invention, the subframe may be used as a front subframe or the like arranged in the front part of the vehicle body.

The subframe (A1) includes a base portion (10) having the following structure. That is, as shown in FIG. 2, in the base portion (10), the members (11), (11), (12) and (12) as four rod-shaped components are substantially square-shaped (planar shape) in plan view. It is formed by connecting to. More specifically, the base portion (10) is a pair of left and right rod-shaped side members (11) (11) which are spaced apart from each other and arranged substantially parallel to each other and which extend in the front-rear direction of the vehicle body.
And the side members (11) (11) which are spaced apart from each other and arranged in a substantially parallel shape and which extend in the left-right direction of the vehicle body.
By a pair of front and rear rod-shaped cross members (12) (12) that are connected to both side members (11) (11)
It is formed in a substantially square shape in a plan view. Therefore, in this base portion (10), the side member (11)
The cross member (12) and the cross member (12) are arranged at a predetermined angle (for example, an angle within the range of 45 to 135 °). In the base portion (10), the side member (11) and the cross member (12) are connected to each other by, for example, melt welding or solid phase joining.

The base portion (10) of this subframe (A1)
In, the side member (11) and the cross member (1
2) corresponds to the "first component" and the "second component" respectively, and / or a pair of left and right side members (11) (11).
Correspond to the "first constituent material" and the "second constituent material", respectively, and / or the pair of front and rear cross members (12) and (12) correspond to the "first constituent material" and the "second constituent material", respectively. is doing.

The side member (11) and the cross member (1
2) is manufactured from a hollow extruded material of aluminum or its alloy. Specifically, for example, it is manufactured from a hollow extruded shape material of 5000 series or 6000 series aluminum alloy, It has a hollow portion that extends to. In particular, it is desirable that the side member (11) and the cross member (12) are made of a hollow extruded material of 6000 series aluminum alloy. Further, a partition wall portion (not shown) for partitioning the hollow portion may be provided in the hollow portion of the side member (11) and / or the cross member (12).

Joint parts (14) connected to other members (not shown) are integrally formed at both ends of each side member (11). The joint portion (14) has a bush mounting hole (14) as a bush mounting portion to which the bush (15) is mounted.
have a). In this bush mounting hole (14a),
The bush (15) is attached by, for example, press fitting. The bush (15) mounted in this bush mounting hole (14a)
The sub-frame (A1) is connected to a main frame (not shown) as a vehicle body via the.

Furthermore, the plate-shaped third component (20) is provided with a pair of left and right side members (11) (11) and a pair of front and rear cross members (12) (12) on the upper surface side of the base portion (10). The space surrounded by and (see Fig. 2, 13) is completely (ie 100
It is arranged in a closed manner and is fixed to the base part (10) (at a closing rate of%). The third component (20) has, for example, a flat plate shape, and its shape is, for example, a substantially quadrangular shape. The third component (20) is fixed to the base (10) by arc welding, laser welding or friction stir welding. In FIG. 1 (B), (W) is the weld or joint. Although not shown, the third component (20) may be fixed to the base (10) by rivet fastening.

The third component (20) is made of aluminum or its alloy, and specifically, for example, 50
It is made of a 00 series or 6000 series aluminum alloy.

The method of manufacturing the subframe (A1) will be described below.

As shown in FIG. 2, first, as described above, the base portion (10) formed in a substantially square shape in plan view is prepared,
The third component (20) is surrounded by a pair of left and right side members (11) (11) and a pair of front and rear cross members (12) (12) on the surface side that is the upper surface of the base portion (10). The closed space (13) is arranged in a completely closed manner. Then, in this state, the peripheral edge portion of the third component (10) is welded to the upper surface of the base portion (10) by arc welding, laser welding or friction stir welding over the entire circumference or partially thereof. By joining, the third component (20) is attached to the base portion (10).
Fixed to. This allows the desired subframe (A1)
Is obtained. In addition, in the present invention, the welding part or the joining part of the third component (20) to the base part (10) is not limited to the peripheral part of the third component (20), and it is not limited to the other part. It may be. Further, the third component member (20) may be fixed to the base portion (10) by rivet fastening.

Thus, according to the subframe (A1) of the first embodiment, the pair of left and right side members (11) (11).
A third component (20) arranged in such a manner that the space (13) surrounded by the pair of front and rear cross members (12, 12) is closed.
However, since it is fixed to the base part (10), the strength and rigidity of the subframe (A1) are high. Therefore,
It is not necessary to set the thickness or cross-sectional area of the subframe (A1) to be large, so that the weight of the subframe (A1) can be reduced.

The actually manufactured subframe (A1) of the first embodiment (referred to as "Example 1") and the steel subframe of the conventional structure (referred to as "Comparative Example 1")
And a 5000-series aluminum alloy subframe having a conventional structure (referred to as “Comparative Example 2”) and a 6000-series aluminum alloy aluminum subframe having a conventional structure (referred to as “Comparative Example 3”). .) And the weight reduction effect, the cost increase amount, and the cost increase rate due to the weight reduction, using the subframe of Comparative Example 1 as a benchmark. The results are shown in Table 1.

[0050]

[Table 1]

In the table, each evaluation item is as follows.

The weight reduction effect is a value obtained by subtracting the weight of each subframe from the weight of the subframe of Comparative Example 1 (that is, the steel subframe of the conventional structure), that is, Comparative Example 1
3 shows the weight reduction amount of each sub-frame with respect to the weight of the sub-frame.

The cost increase amount indicates the amount of cost increase of each sub-frame with respect to the material cost of the sub-frame of Comparative Example 1. Needless to say, the cost increase amount is a reference value.

The cost increase rate due to the weight reduction is a value obtained by dividing the cost increase amount of each subframe by the weight reduction amount.

As is clear from the table, the subframe of the first embodiment (that is, the subframe of the first embodiment (A
According to 1)), in addition to being able to significantly reduce the weight,
It can be seen that the cost increase rate associated with weight reduction can be suppressed as much as possible.

According to the subframe (A1) of the first embodiment, the left and right side members (11) (11) are paired.
Since the space (13) surrounded by the pair of front and rear cross members (12) and (12) is closed by the third component (20), the aerodynamic resistance value of the automobile can be reduced, and by extension the automobile. Performance and fuel efficiency can be improved.

Furthermore, the third component (2
Since (0) is fixed, the strength reliability of the connecting portion (for example, the welded portion or the joined portion) between the members of the base portion (10) is improved.

FIG. 3 shows the subframe (A
2) is shown. In the figure, elements corresponding to the subframe (A1) of the first embodiment are designated by the same reference numerals, and hereinafter, the subframe (A2) of the second embodiment will be described.
Will be described focusing on the points different from the subframe (A1) of the first embodiment.

In the sub-frame (A2) of the second embodiment, the third component (20) has a pair of left and right side members (11) (11) and a pair of front and rear sides on the lower surface side of the base portion (10). The space (13) surrounded by the cross members (12, 12) is arranged so as to completely close the space (13) and is fixed to the base portion (10).

According to the subframe (A2) of the second embodiment, since the third component (20) is arranged on the lower surface side of the base portion (10), the aerodynamic resistance value of the automobile is further reduced. As a result, the performance and fuel efficiency of the automobile can be further improved.

FIGS. 4A and 4B show subframes (A3) and (A4) of the third and fourth embodiments, respectively. In these figures, elements corresponding to the subframe (A1) of the first embodiment are designated by the same reference numerals, and hereinafter, the subframe (A3) of the third and fourth embodiments will be described.
(A4) will be described focusing on the difference from the subframe (A1) of the first embodiment.

In the sub-frame (A3) of the third embodiment shown in FIG. 4A, the number of the third constituent members (20) is two, and both the third constituent members (20) (20). ), One of the third constituent members (20) is a space (13) surrounded by a pair of left and right side members (11) (11) and a pair of front and rear cross members on the upper surface side of the base portion (10). ) Is fixed to the base portion (10), and the other third component (20) closes the space (13) on the lower surface side of the base portion (10). Is fixed to the base portion (10). According to this subframe (A3), it is possible to further increase the strength and the rigidity.

In the subframe (A4) of the fourth embodiment shown in FIG. 4B, the third component (20) closes the space (13) inside the base (10). Is fixed to the base portion (10). This third
A mounting piece (20a) is formed by bending on the peripheral edge of the constituent material (20), and the third constituent material is obtained by performing melt welding or solid phase bonding on the mounting piece (20a). (20) is fixed to the inner peripheral surface of the base portion (10).

5 to 10 show the fifth to the tenth, respectively.
4 illustrates subframes (A5 to A10) of the embodiment. In these figures, the subframe (A1) of the first embodiment is shown.
The same reference numerals are given to the elements corresponding to, and the subframe of each embodiment will be described below focusing on the difference from the subframe (A1) of the first embodiment.

In the subframe (A5) of the fifth embodiment shown in FIG. 5, one or more rod-shaped reinforcing members (16) for reinforcing the base portion (10) are provided inside the base portion (10). ) Are arranged in a diagonal line, and these reinforcing members (16) are connected to the base portion (10).
The base part (10) is reinforced by.

The reinforcing member (16) is made of metal, for example, aluminum or its alloy. In particular, it is desirable that the reinforcing member (16) be made of a hollow extruded material of aluminum or its alloy.

According to the subframe (A5) of the fifth embodiment, since the base portion (10) is reinforced by the reinforcing member (16), the subframe (A5) is further strengthened and has high rigidity. Can be realized. In particular, in this subframe (A5), it is desirable that the third component (20) be fixed to the reinforcing member (16) by mechanical bonding, fusion welding, solid phase bonding, or the like. By doing this,
It is possible to further increase the strength and rigidity of the subframe (A5). The invention is based on the base part (10).
It is not limited to the arrangement position or the arrangement state of the reinforcing member (16).

In the sub-frame (A6) of the sixth embodiment shown in FIG. 6, one surface (for example, the upper surface in detail) of the third component (20) is reinforced with the third component (20). The reinforcing rib portion (21) is integrally formed in a protruding shape (Fig. 6 (b)).
reference). The number of the reinforcing rib portions (21) is, for example, plural, and the plural reinforcing rib portions (21) ... Are formed so as to extend substantially in parallel. In addition, in the present invention, the number, arrangement, and shape of the reinforcing rib portions (21) are not limited.

In the subframe (A7) of the seventh embodiment shown in FIG. 7, the pair of left and right side members (11) (11) of the base portion (10) are present at the installation location of the subframe (A7). In order to avoid an interfering substance (not shown) that occurs, it is bent over the entire length along its length direction. The bent state is, for example, a substantially arc shape. Further, of the pair of front and rear cross members (12) (12), the front cross member (12) has a long length in order to avoid an obstacle (for example, the propeller shaft (32) of the differential device, see FIG. 8). A part of the depth direction is bent. In this embodiment, the front cross member (12) is bent only at the middle portion in the longitudinal direction of the cross member (12), and is bent upward in a substantially arc shape. (12a) is a bent portion of the front cross member (12).
In the present invention, the bending location, the bending direction, and the bending shape of the member forming the base portion (10) are not limited.

On the other hand, the central portion of the third component (20) is bent. Reference numeral (22) is a bent portion of the third component (20). In this embodiment, the bending portion of the third component (20) is only in the central portion, and is bent upward in a substantially arc shape. The reason why the third component (20) is bent in this way is to avoid interfering substances existing at the installation location of the subframe (A7) and / or to set the aerodynamic resistance value of the vehicle to a predetermined value. Etc. In the present invention, the bending direction of the third component (20) may be, for example, the lower side, and the bending direction, bending place, or bending shape is not limited.

The sub-frame (A8) of the eighth embodiment shown in FIG. 8 is arranged substantially horizontally above the differential device (30) installed in the rear part of the vehicle body. It is for supporting the differential device (30). (31) is a differential device (30)
Housing (32) is a propeller shaft. A rear axle (not shown) of the automobile is connected to the housing (31) of the differential device (30).

In this subframe (A8), the pair of left and right side members (11) and (11) of the base portion (10) are present at the installation place of the subframe (A8) as in the seventh embodiment. In order to avoid an interference object (not shown), etc., it is bent over its entire length along its length direction.
On the other hand, the notch (23) is provided at the center of the third component (20).
Is provided. The notch (23) is for avoiding the differential device (30) as an interfering object existing at the installation location of the sub-frame (A8), and has a shape corresponding to the shape of the differential device (30) ( For example, it is formed by cutting from the front end of the third component (20) into a substantially triangular shape or a substantially trapezoidal shape. Furthermore, this third
The reinforcing piece (24) for reinforcing the third frame (20) is attached to the constituent member (20) by rivet fastening, fusion welding or solid phase welding in such a manner that the reinforcing piece (24) traverses the front end of the notch (23). Has been. The reinforcing piece (24) is, for example, in the form of a band and made of metal, and more specifically, made of, for example, aluminum or its alloy. In particular, this reinforcement piece (24) is 5
It is desirable to use a 000 series or 6000 series aluminum alloy. In the present invention, the location and shape of the notch (23) are not limited.

At least a part of the differential device (30) (for example, the housing (30) in the notch (23) of the third component (20) when the sub-frame (A8) is attached to the installation location. 31) upper part) is arranged.

According to the sub-frame (A8) of the eighth embodiment, the sub-frame (A8) can be installed so as not to hit the differential device (30). Further, since the third component (20) is reinforced by the reinforcing piece (24), it is the subframe (A8) in which the notch (23) is provided in the third component (20) as described above. However, the strength and / or rigidity required for the subframe can be reliably ensured.

The notch (23) of the third component (20)
Is intended to avoid an interfering substance existing at the installation location of the subframe, but it is also desirable to further reduce the weight of the subframe in addition to this objective. In this case, the notch (23) is preferably provided in a portion of the third component (20) where stress is low. In addition, in this invention, the notch (23) of the third component (20) is not intended to avoid an interfering object existing at the installation location of the subframe, but is only intended to reduce the weight. It may be one that does.

In the sub-frame (A9) of the ninth embodiment shown in FIG. 9A, the front edge of the peripheral edge of the third component (20) is the front cross member (of the base portion (10)). 12) It is arranged so that it protrudes substantially horizontally to the outside, and the rear end of the peripheral edge further protrudes substantially horizontally from the rear cross member (12) and is fixed to the base part (10). Has been done.
Therefore, this subframe (A9) has extremely high strength and / or rigidity. Further, as shown in FIG. 6B, the third component (20) has a mode in which a side edge portion of a peripheral edge portion thereof protrudes substantially horizontally from the side member (11) of the base portion (10) to the outside. It may be arranged in and fixed to the base portion (10).

In the subframe (A10) of the tenth embodiment shown in FIG. 10, a joint portion (44) connected to another member at a part (for example, a corner portion) of the third component (20). The mounting piece (26) to which is attached is formed by bending (see (b) in the figure). The mounting piece (26) is attached to the base (1
It is fixed to 0) by melt welding or solid phase bonding. Then, the base part (10) is attached to the mounting piece part (26).
And the joint part (44) separate from the third component (20) is welded or joined by a predetermined fixing means (W is a welded part or a joint part), whereby the joint part (44) is the third base. Department (2
It is attached to 0). As a means for fixing the joint portion (44) to the mounting piece portion (26), it is desirable to use melt welding or solid phase joining.

The joint portion (44) has a bush mounting hole (44) as a bush mounting portion to which the bush (15) is mounted.
have a). The joint portion (44) is made of metal, for example, aluminum or its alloy, and particularly preferably 5000 series or 6000 series aluminum alloy.

Further, as shown in the figure, in this subframe (A10), the side member (11) of the base portion (10) is
Is provided with a joint portion (44 ') in an outwardly protruding shape. The joint portion (44 ') is fixed to the side member (11) by mechanical connection, fusion welding or solid phase joining. The joint portion (44 ') is made of metal, and is preferably made of aluminum or its alloy, for example. This joint part (4
4 ') has a U-shaped cross section and has a shaft insertion hole through which the shaft of another member is inserted and which is connected to the other member.

Although the sub-frame of the embodiment of the present invention has been described above, the present invention is not limited to the one shown in the above-mentioned embodiment, and various settings can be changed.

For example, the subframe (A1
.About.A10) are all applied to automobiles, but in the present invention, they may be applied to vehicles other than automobiles (for example, railway vehicles).

Further, the base portion (10) of the sub-frame of the above-mentioned embodiment is formed by connecting a predetermined number of rod-shaped components in a substantially square shape. It may be formed by connecting in a substantially A shape or a substantially U shape.

Further, the third component (20) may have a plurality of holes formed by punching or the like, that is, a so-called punching metal shape.

[0084]

As described above, according to the sub-frame according to the first aspect of the present invention (claim 1), there are two rod-shaped members arranged at a predetermined angle with each other or separated from each other. Since the plate-shaped third constituent member arranged in a manner of closing the space between the first constituent member and the second constituent member is fixed to the base portion provided with the first and second constituent members, It is possible to increase the strength and / or rigidity of the subframe,
The amount of weight increase of the subframe due to this can be suppressed as much as possible, and the weight of the subframe can be reduced. Further, since the strength and rigidity of the subframe can be increased without increasing the thickness or cross-sectional area of the subframe, the manufacturing cost of the subframe can be reduced.

Moreover, the third component makes it possible to protect the parts located above it (such as the engine and the transmission device) from being scratched or rusted due to the rebound of stones, water, or the like. Therefore, by attaching this sub-frame to the vehicle, the parts located above the third component can be kept in a healthy state for a long period of time.

Further, when the base portion is arranged substantially horizontally and the third component is arranged on the lower surface side of the base portion (claim 2), this subframe When is applied to a vehicle, it becomes possible to set the aerodynamic resistance value to a desired value, such as reducing the aerodynamic resistance value of the vehicle.

Further, when at least a part of the third component is bent (claim 3), it is possible to avoid an interfering substance existing at the installation location of the subframe, and / or an aerodynamic resistance value. Can be set to a desired value.

Further, when a cutout portion for avoiding an interfering object existing at the installation location is provided in a part of the third component (claim 4), the sub-object should be prevented from hitting the interfering object. A frame can be installed.

Further, when a reinforcing piece for reinforcing the third component is attached to the third component in such a manner as to cross the notch (claim 5), the strength of the subframe or /
Also, the rigidity can be further improved.

When the third component is provided with a reinforcing rib portion that reinforces the third component (claim 6), the strength and / or the rigidity of the subframe should be further improved. You can

When the third component is provided with a joint portion that is connected to another member (claim 7), a subframe having the joint portion can be obtained.

When the third component is arranged such that at least a part of the peripheral edge of the third component projects outward from the base (claim 8), the strength of the sub-frame or / and / or The rigidity can be further improved.

When the third constituent material is fixed to the base portion by fusion welding or solid phase bonding (claim 9), the third constituent material can be reliably fixed to the base portion.

When one or more constituent materials selected from the group consisting of the first constituent material, the second constituent material and the third constituent material are made of aluminum or its alloy (claim 10) Further weight reduction of the subframe can be achieved.

According to the vehicle of the second aspect of the present invention (claim 11), the fuel consumption and performance of the vehicle can be improved.

According to the subframe manufacturing method of the third invention (claim 12), a lightweight subframe having high strength and / or high rigidity can be obtained.

When the third constituent material is fixed to the base portion by fusion welding or solid phase joining (claim 13),
The third component can be securely fixed to the base portion.

[Brief description of drawings]

1A and 1B are views showing a sub-frame of a first embodiment of the present invention, in which (A) is a perspective view, (B) is an enlarged view of portion A in (A), and (C) is in (A). It is an II sectional view.

FIG. 2 is a perspective view showing a state in which the subframe is being manufactured.

3A and 3B are views showing a sub-frame according to a second embodiment of the present invention, in which FIG. 3A is a perspective view and FIG. 3B is a sectional view taken along line III-III in FIG.

FIG. 4A is a sectional view corresponding to FIG. 1C, showing a subframe of a third embodiment of the present invention; and FIG. 4B is a sectional view showing a subframe of the fourth embodiment of the present invention. 1 (C)
It is sectional drawing corresponding to.

FIG. 5 is a perspective view showing a subframe according to a fifth embodiment of the present invention.

6A and 6B are views showing a sub-frame according to a sixth embodiment of the present invention, in which FIG. 6A is a perspective view and FIG. 6B is an enlarged view of a portion B in FIG. 6A.

FIG. 7 is a perspective view showing a subframe according to a seventh embodiment of the present invention.

FIG. 8 is a plan view showing a subframe according to an eighth embodiment of the present invention.

FIG. 9A is a main-portion plan view showing a subframe according to a ninth embodiment of the present invention, and FIG. 9B is a main-portion plane section showing a modification thereof.

FIG. 10 is a diagram showing a sub-frame according to a tenth embodiment of the present invention, in which (A) is a perspective view and (B) is an enlarged view of a C portion in (A).

[Explanation of symbols]

A1 to A10 ... Subframe 10 ... Base 11 ... Side component 12 ... Cross component 13 ... space 14 ... Fitting 20 ... Third component 21 ... Reinforcing rib 23 ... Notch 24 ... Reinforcing pieces

Claims (13)

[Claims] 1. Arranged at a predetermined angle to each other,
Alternatively, a space (13) between the first constituent material and the second constituent material is provided in a base portion (10) provided with two rod-shaped first and second constituent materials arranged apart from each other. A panel-type sub-frame for a vehicle, wherein a plate-shaped third component (20) arranged in a closed manner is fixed. 2. The base portion (10) is arranged substantially horizontally, and the third component (20) is arranged on the lower surface side of the base portion (10). The panel-type sub-frame of the vehicle according to claim 1. 3. The panel subframe for a vehicle according to claim 1, wherein at least a part of the third component (20) is bent. 4. A cutout portion (2) for avoiding an interfering substance (30) existing at a place of installation in a part of the third component (20).
The panel subframe of the vehicle according to any one of claims 1 to 3, further comprising: 3). 5. A reinforcing piece (24) for reinforcing the third component (20) is attached to the third component (20) in such a manner as to cross the cutout portion (23). 4. The vehicle panel-type subframe according to item 4. 6. The vehicle according to any one of claims 1 to 5, wherein the third component (20) is provided with a reinforcing rib portion (21) for reinforcing the third component (20). Panel-type subframe. 7. The panel-type subframe for a vehicle according to claim 1, wherein the third component (20) is provided with a joint portion (44) connected to another member. . 8. The third constituent member (20) according to claim 1, wherein at least a part of a peripheral portion of the third constituent member (20) is arranged so as to project outward from the base portion (10). A panel-type subframe of the vehicle according to item 1. 9. The vehicle according to claim 1, wherein the third constituent member (20) is fixed to the base portion (10) by mechanical bonding, fusion welding or solid phase bonding. Panel-type subframe. 10. The one or more constituent materials selected from the group consisting of the first constituent material, the second constituent material and the third constituent material are made of aluminum or an alloy thereof. A panel-type subframe for a vehicle according to any one of items 1 to 9. 11. A vehicle comprising the panel type sub-frame (A1 to A10) according to any one of claims 1 to 10. 12. A base part (10) comprising two rod-shaped first and second components which are arranged at a predetermined angle to each other or are spaced apart from each other, wherein the first part is provided.
A panel-type subframe for a vehicle, characterized in that a plate-shaped third component (20) arranged in a manner of closing a space (13) between the component and the second component is fixed. Manufacturing method. 13. The method of manufacturing a panel subframe for a vehicle according to claim 12, wherein the third component (20) is fixed to the base portion (10) by mechanical bonding, fusion welding or solid phase bonding.