JP6471933B2 - Vehicle frame structure - Google Patents

Description

  The present invention relates to a vehicle frame structure.

  In Patent Document 1, a track chassis frame using an aluminum alloy is divided into a rear side rail on the rear side of the vehicle body and a front side rail on the front side of the vehicle body, and the hollow member constituting the front side rail is made of aluminum. A structure is described in which an alloy molded plate is used and the rear side rail is an aluminum alloy extruded profile, and the two are rigidly coupled to each other.

JP 2006-111228 A

  Since a load in the vertical direction acts on the body frame of the traveling truck, the side member (track chassis frame) of the body frame is configured by coupling the front side member (front side rail) and the rear side member (rear side rail). In this case, it is necessary to increase the rigidity of the coupling portion with respect to the load in the vertical direction.

  Accordingly, the present invention has an object to provide a vehicle frame structure in which a side member of a vehicle body frame is divided into a front side member and a rear side member, and the necessary frame rigidity can be ensured when the vehicle is traveling. .

  In order to achieve the above object, the present invention comprises a side member that extends in the front-rear direction and supports the cab and the loading platform from below, and is divided into a front side member on the front side and a rear side member on the rear side. This is a vehicle frame structure in which a rear end portion and a front end portion of a rear side member are combined and integrated. The front side member is formed of a press-molded metal plate material. The rear side member is formed of an extruded or roll-formed metal plate material.

In the first aspect of the present invention, the rear end portion of the front side member includes a front outer side surface portion and a front inner side surface portion facing each other in the vehicle width direction and extending in the vertical direction, and a front outer side surface portion and a front inner side surface portion. And a front side member upper inserted between the two. The front side member upper has a U-shaped cross section in which a front upper outer side surface portion and a front upper inner side surface portion are bent downward from both ends of the front upper surface portion in the vehicle width direction and face each other. The front upper outer side surface and the front upper inner side surface are arranged between the front outer side surface and the front inner side surface with the front side member upper positioned below the upper ends of the front outer side surface and the front inner side surface. They are welded overlapping each other in the width direction. A region above the front side member upper portion of the front outer side surface portion and the front inner side surface portion is a pair of left and right side support plates that extend upward from both sides in the vehicle width direction of the upper surface of the upper surface of the front upper and face each other. Parts. The front end portion of the rear side member is mounted on the upper surface of the upper surface of the front upper portion and welded to the rear member lower surface portion, and extends upward from both sides of the rear member lower surface portion in the vehicle width direction to a pair of side support plate portions. A rear member outer side surface portion and a rear member inner side surface portion that are overlapped and welded in the vehicle width direction.

In the above configuration, the rear side member is placed on the front side member and welded at the joint between the rear end of the front side member and the front end of the rear side member, and the vertical width of the joint increases. For this reason, the rigidity (bending strength) of the coupling portion with respect to the load in the vertical direction can be increased. Therefore, the side member can be divided into the front side member and the rear side member, and the frame rigidity required for traveling the vehicle can be ensured.

Moreover, since it is not necessary to separately provide a reinforcing member for reinforcing the coupling portion, it is possible to suppress an increase in the number of parts and the number of man-hours. Moreover, the rigidity (torsional strength) of the coupling portion with respect to the roll direction can be increased by the side support plate portion.

The second aspect of the present invention is the frame structure according to the first aspect, wherein the width of the side member in the vertical direction is maximized at the joint between the rear end portion of the front side member and the front end portion of the rear side member. Is set as follows.

  In the above configuration, since the vertical width of the side member is maximized at the coupling portion, the rigidity of the coupling portion with respect to the load in the vertical direction can be further increased.

A third aspect of the present invention is the frame structure according to the first or second aspect, wherein a cab mount bracket that supports a rear end portion of the cab is fixed to the front side member. A body mount bracket that supports the front end portion of the cargo bed is fixed to the rear side member. The rear end portion of the front side member and the front end portion of the rear side member are coupled between the cab mount bracket and the body mount bracket.

  In the above configuration, the front side member and the rear side member are coupled in the boundary region between the cab and the loading platform where the vertical load acting on the vehicle body frame when the vehicle travels increases remarkably. Since the width increases, the rigidity of the side member can be increased more accurately.

  According to the present invention, the side member of the vehicle body frame is divided into the front side member and the rear side member, and the frame rigidity necessary for traveling the vehicle can be ensured.

It is a side view showing the frame structure of the vehicle concerning one embodiment of the present invention. It is the perspective view which looked at the frame structure of FIG. 1 from diagonally upward. It is sectional drawing of the side member of FIG. 1, (a) shows a IIIa-IIIa arrow cross section, (b) shows a IIIb-IIIb arrow cross section, respectively.

  Hereinafter, a vehicle frame structure according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the front-rear direction is the front-rear direction of the traveling direction of the vehicle, and the left-right direction is the left-right direction when facing the front of the vehicle. In the figure, an arrow FR indicates the front of the vehicle, and an arrow UP indicates the upper side of the vehicle.

  As shown in FIGS. 1 and 2, a vehicle body frame 1 includes a pair of left and right side members 2 extending in the front-rear direction, and a plurality of cross members 3 extending in the vehicle width direction and connecting the left and right side members 2 to each other. And have. In the present invention, the side member 2 is divided into a front side member 4 on the front side and a rear side member 5 on the rear side, and the rear end portion of the front side member 4 and the front end portion of the rear side member 5 are combined. Integrate. FIG. 1 shows the left side member 2, and the left and right side members 2 are substantially symmetrical.

  As shown in FIG. 3A, the region other than the rear end portion of the front side member 4 includes a front side member outer 6 on the outer side in the vehicle width direction and a front side member inner 7 on the inner side in the vehicle width direction. The front side member outer 6 has a U-shaped cross section in which the front outer upper surface portion 6a and the front outer lower surface portion 6b are bent and extended inward in the vehicle width direction from the upper end and lower end of the front outer side surface portion 6c. To do. The front side member inner 7 has a U-shaped cross section in which the front inner upper surface portion 7a and the front inner lower surface portion 7b are bent outward from the upper end and lower end of the front inner side surface portion 7c and open outward in the vehicle width direction. To do.

  On the outer surfaces of the upper and lower opening edge portions 8 of the front side member outer 6 (the upper surface of the front outer upper surface portion 6a in the vehicle width direction inner edge portion and the lower surface of the front outer lower surface portion 6b in the vehicle width direction inner edge portion) The inner surfaces of the upper and lower opening edge portions 9 of the front side member inner 7 (the lower surface of the front inner upper surface portion 7a in the vehicle width direction outer edge portion and the upper surface of the front inner lower surface portion 7b in the vehicle width direction outer end edge portion) Overlapping and overlapping opening edge portions 8 and 9 are welded together. Thereby, the rectangular cylindrical front side member 4 is formed. The front side member 4 has a front member upper surface portion 4a, a front member lower surface portion 4b, a front member outer surface portion 4c, and a front member inner surface portion 4d, and defines a closed space inside thereof. The front outer upper surface portion 6a and the front inner upper surface portion 7a constitute a front member upper surface portion 4a, the front outer lower surface portion 6b and the front inner lower surface portion 7b constitute a front member lower surface portion 4b, and the front outer side surface portion 6c is a front member. The outer side surface portion 4c is constituted, and the front inner side surface portion 7c constitutes the front member inner side surface portion 4d. The front member upper surface portion 4a and the front member lower surface portion 4b are separated from each other in the vertical direction, and the front member outer surface portion 4c and the front member inner surface portion 4d are separated from each other in the vehicle width direction and are opposed to each other.

  As shown in FIG. 3B, the rear end portion of the front side member 4 includes a front side member upper 20 in addition to the front side member outer 6 and the front side member inner 7. At the rear end portion of the front side member 4, the front side member outer 6 has an L-shaped cross section that extends upward without bending the upper end of the front outer side surface portion 6c inward in the vehicle width direction. The front inner side surface portion 7c has an L-shaped cross section extending upward without bending outward in the vehicle width direction, and the vehicle width of the front inner lower surface portion 7b on the lower surface of the inner edge of the front outer lower surface portion 6b in the vehicle width direction. The upper surface of the direction outer end edge is overlapped and welded. The front side member upper 20 has a U-shaped cross section in which a front upper outer side surface portion 20b and a front upper inner side surface portion 20c are bent downward from both ends of the front upper upper surface portion 20a in the vehicle width direction and face each other. The front side member upper 20 is disposed between the front outer side surface portion 6c and the front inner side surface portion 7c so that the front upper upper surface portion 20a is positioned below the respective upper ends of the front outer side surface portion 6c and the front inner side surface portion 7c. The front upper outer side surface portion 20b is welded to the front outer side surface portion 6c, and the front upper inner side surface portion 20c is welded to the front inner side surface portion 7c. Thereby, the rectangular cylindrical front side member 4 is formed. The front upper upper surface portion 20a constitutes the front member upper surface portion 4a, the front outer lower surface portion 6b and the front inner lower surface portion 7b constitute the front member lower surface portion 4b, and the front outer side surface portion 6c constitutes the front member outer surface portion 4c. The front inner side surface portion 7c constitutes a front member inner side surface portion 4d. The region above the front upper upper surface portion 20a of the front outer side surface portion 6c and the front inner side surface portion 7c is the vehicle width direction of the upper surface of the rear end portion of the front side member 4 (the upper surface of the front upper upper surface portion 20a). A pair of left and right side support plate portions 21 that extend upward integrally from both sides and oppose each other are configured.

  The front side member outer 6 and the front side member inner 7 are each formed by press-molding a metal plate material (steel plate in the present embodiment). Since it is press molding, it is not necessary to set a uniform cross-sectional shape in the front-rear direction, and the degree of freedom in design is relatively large. The method for forming the front side member upper 20 may be press molding, or may be roast molding or extrusion molding described later.

  The rear side member 5 also has a rectangular cylindrical shape that divides a closed space inside, but unlike the front side member 4, the rear side member 5 is integrally formed by roll forming a metal plate (in this embodiment, a steel plate). That is, the front side member 4 is composed of two members (a front side member outer 6 and a front side member inner 7) (the rear end is a three member including a front side member upper 20), whereas the rear side member 5 is The rear member upper surface portion 5a, the rear member lower surface portion 5b, the rear member outer surface portion 5c, and the rear member inner surface portion 5d are integrally formed of one member. The rear member upper surface portion 5a and the rear member lower surface portion 5b are spaced apart from each other in the vertical direction, and the rear member outer surface portion 5c and the rear member inner side surface portion 5d are spaced from each other in the vehicle width direction and are opposed to each other. Because of roll forming, the cross-sectional shape is set to be substantially uniform in the front-rear direction, and the degree of freedom in design is relatively small.

  In addition, you may form the front side member 4 and the rear side member 5 with metals (for example, aluminum) other than a steel plate. Further, the rear side member 5 may be formed by extrusion molding.

  The left and right width of the inner surface of the rear end portion of the front side member 4 (the distance between the inner surfaces of the front member outer surface portion 4c and the front member inner surface portion 4d) is the left and right width of the outer surface of the front end portion of the rear side member 5 (the rear member outer surface portion 5c and the rear member). The distance between the outer surface and the inner surface portion 5d is slightly larger than the front surface portion, and the front end portion of the rear side member 5 is inserted between the left and right side support plate portions 21 at the rear end portion of the front side member 4 from above. The rear member lower surface portion 5b is placed on the front member upper surface portion 4a and joined by welding. The rear member outer side surface portion 5c and the rear member inner side surface portion 5d are welded to the left and right side support plate portions 21.

  As described above, in the joint portion 10 between the rear end portion of the front side member 4 and the front end portion of the rear side member 5, the front side member 4 and the front side member 4 are placed with the lower surface of the rear side member 5 placed on the upper surface of the front side member 4. The rear side member 5 is welded, and the vertical width H of the side member 2 is maximized at the joint portion 10. In the present embodiment, the front member lower surface portion 4b at the rear end portion of the front side member 4 extends inclined rearward and upward (see FIG. 1), so that the vertical width H of the side member 2 is equal to the coupling portion 10. At the front end of

  The front side member 4 has a curved shape with a middle portion slightly recessed downward, and the rear end portion of the front side member 4 extends obliquely rearward and upward. The rear side member 5 extends substantially horizontally over substantially the entire front and rear direction.

  A cab mount bracket 12 that supports the rear end portion of the cab 11 of the vehicle from below is fixed to the front side member 4. In the present embodiment, the cab mount bracket 12 is fixed to the coupling portion 10, but may be fixed near the front of the coupling portion 10. The front end portion of the cab 11 is rotatably supported by the front end portion of the front side member 4. In addition, a plurality of members (for example, a coil tower 14) for a front wheel (front tire) 13 and a plurality of members (for example, an engine mount bracket (not shown)) for an engine (not shown) are provided at an intermediate portion of the front side member 4. The front side member 4 is supported by the front wheel 13.

  A body mount bracket 16 is fixed to the rear side member 5 to support a loading platform 15 disposed behind the cab 11 from below. A plurality of body mount brackets 16 are arranged in the front-rear direction, and the foremost body mount bracket 16F supports the front end of the loading platform. The fixing position of the foremost body mount bracket 16 </ b> F is near the rear of the coupling portion 10. A plurality of members (for example, a rear suspension bracket (not shown) and the like) for the rear wheel (rear tire) 17 are fixed to an intermediate portion of the rear side member 5, and the rear side member 5 is supported by the rear wheel 17.

  As described above, the rear end portion of the front side member 4 and the front end portion of the rear side member 5 are coupled between the cab mount bracket 12 and the body mount bracket 16.

  According to the present embodiment, since the side member 2 is divided into the front side member 4 and the rear side member 5, when manufacturing a vehicle of a different vehicle type or vehicle type, only the front side member 4 is changed to the vehicle type or vehicle type. The rear side member 5 can be a common part, and the productivity can be improved.

  Since the front side member 4 is formed by press molding with a relatively high degree of freedom in design, it can be designed in a desired shape corresponding to the vehicle type and vehicle type.

  Since the rear side member 5 is formed by extrusion molding or roll molding which is cheaper than press molding, an increase in cost can be suppressed.

  Further, in the coupling portion 10, the rear side member 5 is mounted on the front side member 4 and welded, the vertical width H of the coupling portion 10 increases, and the vertical width H of the side member 2 is the coupling portion 10. Maximum. For this reason, the rigidity (bending strength) of the coupling portion 10 with respect to the load in the vertical direction can be increased.

  Further, the side support plate portion 21 can increase the rigidity (torsional strength) of the coupling portion 10 with respect to the roll direction.

  Further, since the front side member 4 and the rear side member 5 are coupled at the boundary region between the cab 11 and the loading platform 15 where the vertical load acting on the vehicle body frame significantly increases when the vehicle travels, the rigidity of the side member 2 is increased. Can be raised more accurately.

  Therefore, the side member 2 can be divided into the front side member 4 and the rear side member 5, and the frame rigidity required for traveling the vehicle can be ensured.

  Moreover, since it is not necessary to separately provide a reinforcing member for reinforcing the coupling portion 10, it is possible to suppress an increase in the number of parts and man-hours.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  For example, both the front side member 4 and the rear side member 5 may be substantially linear, and the rear side member 5 may be supported by a plurality of rear wheels.

  The frame structure of the present invention can be applied to various vehicles including a cab and a loading platform.

DESCRIPTION OF SYMBOLS 1 Body frame 2 Side member 3 Cross member 4 Front side member 5 Rear side member 6 Front side member outer 7 Front side member inner 10 Connection part 11 Cab 12 Cab mount bracket 15 Loading platform 16, 16F Body mount bracket 20 Front side upper 21 Side Support plate

Claims (3)

The side member that extends in the front-rear direction and supports the cab and the loading platform from below is divided into a front side member on the front side and a rear side member on the rear side, and the rear end portion of the front side member and the front end portion of the rear side member A vehicle frame structure that combines and integrates
The front side member is formed of a press-molded metal plate material,
The rear side member is formed of an extruded or roll-formed metal plate material,
The rear end portion of the front side member is inserted between a front outer side surface portion and a front inner side surface portion facing each other in the vehicle width direction and extending in the vertical direction, and between the front outer side surface portion and the front inner side surface portion. Front side member upper
The front side member upper is a U-shaped cross section in which the front upper outer side surface portion and the front upper inner side surface portion are bent downwardly extending from both ends of the front upper surface portion in the vehicle width direction, and face each other.
The front upper outer side surface portion and the front upper inner side surface portion are the front outer side surface portion and the front outer side surface portion in a state where the front side member upper is positioned below the respective upper ends of the front outer side surface portion and the front inner side surface portion. It is overlapped and welded to the front inner side part in the vehicle width direction,
A region above the front side member upper portion of the front outer side surface portion and the front inner side surface portion extends upward from both sides in the vehicle width direction of the upper surface of the front upper upper surface portion, and is a pair of left and right opposing each other. Configure the side support plate,
A front end portion of the rear side member is mounted on the upper surface of the front upper surface and welded to the rear member lower surface, and extends upward from both sides in the vehicle width direction of the rear member lower surface to support the pair of side supports. A frame structure for a vehicle , comprising: a rear member outer side surface portion and a rear member inner side surface portion which are each overlapped and welded to the plate portion in the vehicle width direction . The vehicle frame structure according to claim 1,
The width of the side member in the vertical direction is maximized at the joint between the rear end of the front side member and the front end of the rear side member . A vehicle frame structure according to claim 1 or claim 2, wherein
A cab mount bracket that supports a rear end portion of the cab is fixed to the front side member ,
A body mount bracket that supports a front end portion of the cargo bed is fixed to the rear side member,
A vehicle frame structure characterized in that a rear end portion of the front side member and a front end portion of the rear side member are coupled between the cab mount bracket and the body mount bracket .

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