JP6037513B2 - Vehicle base structure - Google Patents

Description

  The present invention relates to a vehicle base structure.

  Patent Document 1 describes a vehicle body frame structure in which a subframe is integrally coupled to an existing chassis frame of a freight vehicle, and a special equipment having a large weight is mounted on the subframe. In such a vehicle body frame structure, stress concentration of the vehicle body frame occurs at the front end edge of the subframe. Therefore, the front end of the front end portion in the side view is to be formed so as to gradually reduce the rigidity of the front end portion of the subframe. An open fork-shaped groove is provided, a front-up inclined surface is provided on the lower surface of the front end portion, or a front-up inclined surface is provided on the upper surface of the front end portion.

Japanese Patent No. 4057836

  In the above conventional structure, a groove and an inclined surface must be formed at the front end portion of the subframe, which is a long and large heavy object, and the processing is complicated.

  The present invention has been made in view of the above-described situation, and is a vehicle base structure capable of reducing the stress concentration of a load acting on the chassis frame from the front end portion of the subframe without requiring complicated processing. For the purpose of provision.

  In order to achieve the above object, according to the present invention, in a rear region of a cab of a pair of left and right chassis frames extending rearward from a front end portion on which the cab is mounted, a protruding portion partially protrudes from a planar upper surface of the chassis frame. In addition, it is a vehicle base structure in which a structure is mounted on a chassis frame, and includes a pair of left and right resin long plate spacers and a pair of left and right subframes.

  Each spacer has a plate thickness equal to or higher than the protruding height of the protrusion, and is placed on the upper surface of the rear region of the chassis frame and extends in the front-rear direction. Each sub-frame is placed on the upper surface of the spacer and extends in the front-rear direction, and is fixed to the chassis frame. The structure is placed on the left and right subframes and coupled to the subframes.

On the lower surface or upper surface of the front end portion of the spacer on which the front end portion of the subframe is placed, an inclined surface that is inclined rearwardly downward or rearwardly upward from the front end of the spacer is formed. The front end of the spacer is the front end of the subframe. It is arranged behind .

  In the above configuration, since the inclined surface is formed on the lower surface or the upper surface of the front end portion of the spacer, the stress concentration of the load acting on the chassis frame from the front end portion of the subframe can be relaxed by the inclined surface.

  In addition, since the inclined surface may be formed at the front end portion of the spacer that is lighter than the subframe, processing is easy.

  According to the present invention, the stress concentration of the load acting on the chassis frame from the front end portion of the subframe can be alleviated without requiring complicated processing.

It is a side view showing the base structure of the vehicle of one embodiment of the present invention. It is a perspective view of the base structure of FIG. It is the front view which looked at the base structure of Drawing 1 from the front. FIG. 3 is a side view of FIG. 2. It is a side view which shows the other aspect of a spacer.

  A vehicle base structure according to an embodiment of the present invention will be described with reference to the drawings. In the figure, the arrow FR indicates the front of the vehicle, the arrow IN indicates the inner side in the vehicle width direction, and the arrow UP indicates the upper side.

  As shown in FIGS. 1 and 2, the body frame of the truck includes a pair of left and right chassis frames 1 that extend linearly in the front-rear direction. Each chassis frame (side frame) 1 has a side wall 2 erected along the vertical direction, a lower wall 3 extending inward in the vehicle width direction from the lower end of the side wall 2, and extending inward in the vehicle width direction from the upper end of the side wall 2. It has a substantially U-shaped cross section with an upper wall 4. The chassis frame 1 may have a rectangular cylindrical shape.

  A cab 30 is mounted on the front ends of the left and right chassis frames 1, and a reinforcing member or the like is fixed to the chassis frame 1 on the planar upper surface of the upper wall 4 of each chassis frame 1 in the rear region of the cab 30. A rivet head (protrusion) 15 for projecting partially protrudes. The rivets are respectively arranged at a plurality of predetermined positions in the front-rear direction of the chassis frame 1.

  In the rear region of the cab 30, a pair of left and right spacers 31 made of resin long plates that extend linearly in the front-rear direction are mounted on the upper surfaces of substantially the entire front-rear direction of the upper walls 4 of the left and right chassis frames 1. Placed. Each spacer 31 has a plate thickness equal to or greater than the protruding height of the rivet head 15, and the spacer 31 is processed to avoid interference with the rivet head 15. The spacer 31 of the present embodiment is formed of a relatively hard resin material (for example, waste plastic), and a groove-shaped recess 32 (see FIG. 5) on the lower surface of the spacer 31 for avoiding interference with the rivet head 15. 3 and FIG. 4) are formed over substantially the entire region in the front-rear direction. The spacer 31 may be formed of another resin material (for example, a relatively soft resin material), and other processing (for example, holes) may be used to avoid interference with the head portion 15 of the rivet. Formation). Alternatively, the spacer 31 may be attached to the upper surface of the chassis frame 1 with an adhesive or the like.

  On the upper surfaces of the left and right spacers 31, a pair of left and right subframes (vertical joists) 5 that extend linearly in the front-rear direction are mounted. Each sub-frame 5 includes a side plate 6 erected along the vertical direction, a lower plate 7 extending inward in the vehicle width direction from the lower end of the side plate 6, and a lower plate 7 facing the lower plate 7 from the upper end of the side plate 6. It has a substantially U-shaped cross section with an upper plate 8 extending inward. By interposing the spacer 31, the subframe 5 is mounted on the chassis frame 1 without interfering with the rivet head 15. The front end of the subframe 5 is cut so as to be substantially orthogonal to the front-rear direction (substantially orthogonal to the side plate 6, the lower plate 7, and the upper plate 8).

  The sub-frame 5 includes a plurality of members in which both ends of a U-shaped steel shaft member (eg, U bolt) having male screw portions at both ends are inserted into a steel plate material (eg, washer), a nut is screwed into the male screw portion and tightened. It is coupled to the chassis frame 1 by a fastening member 9 (shown in FIG. 4) that restrains. The spacer 31 is firmly held between the chassis frame 1 and the subframe 5 by the restraint of the fastening member 9.

  In the rear region of the cab 30, a plurality of cross frames 14 that cross over the sub frame 5 are placed on the upper surface of the upper plate 8 of the left and right sub frames 5, and the sub frame 5 and the cross frame 14 are: It is fastened and fixed via an angle clip 16. On the cross frame 14, a floor plate (not shown) of the loading platform (structure) 10 is placed and fixed.

  As shown in FIGS. 3 and 4, an inclined surface 33 is formed on the lower surface of the front end portion of the spacer 31 on which the front end portion of the subframe 5 is placed, and is inclined obliquely downward and rearward from the front end of the spacer 31. .

  According to the present embodiment, since the inclined surface 33 is formed on the lower surface of the front end portion of the spacer 31, the stress concentration of the load acting on the chassis frame 1 from the front end portion of the subframe 5 is relieved by the inclined surface 33. Can do.

  Further, the front end of the subframe 5 remains in a state of being cut so as to be substantially orthogonal to the front-rear direction, and the front end portion of the subframe 5 has a special processing (for example, a subframe for relaxing the stress concentration of the load). 5 is not performed, and the inclined surface 33 may be formed at the front end portion of the spacer 31 that is lighter than the subframe 5, so that the processing is easy.

  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, instead of the inclined surface 33, as shown in FIG. 5, an inclined surface 34 that is inclined obliquely upward and rearward from the front end of the spacer 31 on the upper surface of the front end portion of the spacer 31 on which the front end portion of the subframe 5 is placed. May be formed. Also in this case, the stress concentration of the load acting on the chassis frame 1 from the front end portion of the subframe 5 can be relaxed by the inclined surface 34.

  Further, the structure mounted on and coupled to the subframe 5 is not limited to the cargo bed 30, but may be another structure (for example, a box-shaped luggage room or a tank).

1 Chassis frame 4 Upper wall 5 Subframe 7 Lower plate 10 Loading platform (structure)
15 Rivet head (protrusion)
30 Cab 31 Spacer 33, 34 Inclined surface

Claims (1)

In the rear region of the cab of the pair of left and right chassis frames extending rearward from the front end portion on which the cab is mounted, a protrusion protrudes partially from the planar upper surface of the chassis frame, and a structure is provided on the chassis frame. Is the base structure of the vehicle on which is mounted,
A pair of left and right resin long plate-like spacers that have a plate thickness equal to or higher than the protruding height of the protrusion, and are placed on the upper surface of the rear region of the chassis frame and extend in the front-rear direction;
A pair of left and right subframes mounted on the upper surface of the spacer and extending in the front-rear direction and fixed to the chassis frame,
The structure is placed on the left and right subframes and coupled to the subframes,
On the lower surface or upper surface of the front end portion of the spacer on which the front end portion of the sub-frame is placed, an inclined surface that is inclined rearwardly downward or rearwardly upward from the front end of the spacer is formed ,
The base structure of the vehicle , wherein a front end of the spacer is disposed behind a front end of the subframe .

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