JP2575733B2 - Vehicle underframe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an underframe for effective use of space and improvement of workability when devices are arranged and mounted on an underframe of a vehicle.

[Prior Art and Problems] FIGS. 7 to 10 show an example of a conventional underframe.

That is, as shown in FIGS. 7 and 10, a plurality of transverse holes 21 constituting the underframe 20 are provided with a plurality of insertion / removal holes for bolts 22 for mounting equipment in the longitudinal direction of the lower flange 21a. It is.

Therefore, the equipment 23 is fixed to the lower flange 21 by the bolt 22.
Although it can be directly attached to a, it has the following problems.

(A) The bending moment due to the weight of the device 23 acts on the lower flange 21a, which may cause local deformation. As a preventive measure, a reinforcing member 24 must be provided on the horizontal beam 21.

(B) In addition to the bending moment due to the weight of the device, a torsional moment due to a deviation between the cross-sectional neutral axis of the lateral beam 2 and a load point (deviation due to an eccentric load) is generated in the entire lateral beam 21.

(C) As shown in FIG. 8, the space occupied by the piping hole 25 provided through the horizontal beam 21 is limited by the presence of the reinforcing member 24 and the bolts for mounting and removing the device 23 shown in FIG.
Due to the decrease in the interference with the attachment / detachment direction indicated by the arrow 22, the pipe holes 25 cannot be made to have a constant size and shape, and the space S of the underframe 20 including the horizontal beam 21 has a shortage of capacity. As shown in FIG.
Needs to be arranged, and therefore, it is necessary to interpose the mounting bracket 27 on the lower flange 21a in the device mounting portion.

(D) With the interposition of the mounting bracket 27, the mounting space for the equipment 23 is reduced, and as shown in FIG. 9, the height H from the upper surface of the rail 28 to the upper surface of the underframe 20 is increased, and the bottom floor of the vehicle body Inability to structure.

 11 to 14 show other examples of the conventional underframe.

That is, as shown in FIG. 11 to FIG. 13, a pair of webs 31a and a pair of webs 31a are orthogonal to the lower surface of the base frame 30 in which the base frame and the floor portion are integrated with a light alloy extrusion member. A plurality of groove portions 31 are formed in which the heads of the bolts 22 for mounting equipment, which are formed of a pair of flanges 31b bent inwardly to each other, are slidable.

Accordingly, the manufacture of the underframe 30 is simple, but has the following problems.

(A) As shown in FIG. 12, the intervals C and D between the grooves 31 are determined by the position of the grooves 31 when the underframe member is manufactured and the arrangement of the members when the underframe is constructed. May not match the distance between

(B) As shown in FIG. 13, the wiring 3 is inserted into the hollow portion 30a of the underframe 30.
In the case where the capacity of the hollow portion 30a is insufficient, it is necessary to arrange the piping 26 also on the lower surface of the underframe 30, as shown in FIG. It is necessary to interpose the mounting bracket 33 on 31.

(C) The installation space of the equipment 23 is reduced by the interposition of the mounting bracket 33, and as shown in FIG.
The height H up to the upper surface of 30 became large, and the bottom floor of the vehicle body could not be structured.

[Means for solving the problem]

The present invention has been made in order to solve the problems of the conventional example as described above, and the structure is provided at the lower part in the longitudinal direction of the horizontal beam that constitutes the underframe installed in accordance with the interval between the device mounting portions. A pair of webs extended to the left and right and a flange bent inward by lower ends of the pair of webs constitute a groove opening on the lower surface, and a horizontal frame constituting an underframe installed in accordance with the interval between the device mounting portions. A frame formed with a pair of webs extending left and right and a flange bent inward from the lower ends of the pair of webs at a lower portion in the longitudinal direction of the beam to form a groove having an opening on a lower surface; The head of the bolt for mounting the device is formed in a non-rotatable rectangle within the web, and the length of the short side of the rectangle is larger than the interval between the openings and can slide in the pair of webs. Dimensions and above opening An enlarged opening having a width through which the short side of the head of the bolt can be inserted is provided.

Alternatively, a step portion having a width smaller than the interval between the pair of webs is provided on the inner surface of the flange in the web, and the head of a bolt for mounting equipment inserted into the web can be rotated in the web. It is formed in a rectangle of a suitable size, the length of the short side of the rectangle is a dimension that can be inserted through the opening,
The length of the long side of the rectangle is larger than the interval between the openings, and is a dimension that is inserted into the step so as not to rotate.

(Operation)

The head of the bolt for mounting the device is formed in a non-rotatable rectangle within the web, and the length of the short side of the rectangle is larger than the interval between the openings and can slide in the pair of webs. In an underframe provided with an enlarged opening having a width that allows the short side of the head of the bolt to be inserted into the opening, the head of the bolt is inserted into the web through the enlarged opening, Slide inside the web to the mounting position and tighten the equipment with nuts screwed into bolts.

Since the head of the bolt in the web cannot rotate in any of the tightening and loosening directions, the bolt does not rotate in the loosening direction even if it is subjected to the vibration of the running vehicle. There is no danger of a catastrophe dropping out.

Alternatively, a step portion having a width smaller than the interval between the pair of webs is provided on the inner surface of the flange in the web, and a head of a bolt for mounting equipment inserted in the web can be rotated in the web. It is formed in a rectangle of a suitable size, the length of the short side of the rectangle is a dimension that can be inserted through the opening,
The length of the long side of the rectangle is larger than the interval between the openings, and the underframe is dimensionally inserted into the step portion so as not to be able to rotate. The head is turned approximately 90 degrees in the web, and both ends of the long side of the head are placed on the steps, and the device is tightened with nuts screwed into bolts.

Since the head of the bolt inserted into the step cannot rotate in either the tightening or loosening direction, the bolt does not rotate in the loosening direction even if it is subjected to the vibration of the running vehicle. There is no danger of catastrophic loss of equipment.

〔Example〕

 Embodiments of the present invention will be described with reference to the drawings.

 The same parts as those in the conventional example are denoted by the same reference numerals.

As shown in FIGS. 1 to 3 (A), a horizontal beam 2 constituting a frame 1 installed in accordance with the required installation intervals A and B of the equipment is provided at the lower part in the longitudinal direction, at the left and right sides. A pair of expanded webs 3a and a flange 3b that is bent inward from the lower ends of the pair of webs 3a form a groove 3 that opens to the lower surface. head
4a is formed into a square (rectangle, square).

The width of the groove 3 is the distance between the inner wall surfaces of the pair of webs 3a. The opposite side of the head 4a of the bolt 4 is slidable, and the head 4a is not rotatable.

The attachment and detachment of the head 4a of the bolt 4 from the groove 3 is performed in the fourth step.
Two modes shown in FIGS. (A) and (B) are adopted.

That is, what is shown in FIG. 4 (A) is a pair of flanges of the groove 3 as seen in contrast to FIG. 3 (A).
The rectangular head 4a of the bolt 4 is inserted into the groove 3 from the enlarged opening 3d formed in a part of the opposing opening 3c of 3b, and is slid to a predetermined position.

Therefore, the head 4a is engaged with the flange 3b to prevent the head 4a from falling off, and the pair of webs 3a serves as a stopper for the head 4a.

FIG. 4 (B) shows the inner part of the groove 3 (web 3a) as seen in contrast to FIG. 3 (B).
The head 4a of the bolt 4a is formed through the facing opening 3c in a space 3e large enough to allow the rectangular head 4a of the bolt 4 formed on
Is inserted, and the head 4a is rotated by 90 ° in the space 3e and slid to a predetermined position.

Therefore, the head 4a is engaged with the flange 3b to prevent the head 4a from falling off, and the narrow step formed below the space 3e.
3f stops the rotation of the head 4a.

As shown in FIGS. 5 and 6, the device 23 is attached to the lower surface of the beam 2 by a bolt 4 which slides the groove 3 appropriately and a nut (not shown) screwed to the bolt 4. At this time, the attachment and detachment of the bolt 4 is performed by the lower surface of the horizontal beam 2 below.

Therefore, the space S in the underframe 1 including the horizontal beam 2 has no projecting parts such as the bolts 22 of the related art, and
However, since the strength of the cross beam 2 accompanying the shape having the pair of webs 3a extended left and right at the lower portion of the cross beam 2 does not require the reinforcing member 24 or the like of the conventional example, the space S is used for installation of the piping hole 25 and the like. It can be used effectively.

Therefore, the mounting bracket 27 of the conventional example becomes unnecessary, and the piping holes 25 can be arranged at equal intervals as shown in FIG. 2 and FIG. Simplified and standardized.

Further, the intervals A, B, etc. of the horizontal beams 2 may be determined by a pledge so as to match the dimensions of the mounting portion of the device 23, and may be a fixed pitch or different.

Then, as described above, the mounting bracket 27 seen in the conventional example is used.
5, the height H from the upper surface of the rail 28 to the upper surface of the underframe 1 is small as shown in FIG. 5, and the bottom floor of the vehicle body can be structured.

(Effect)

 The present invention has the following effects.

(A) The mounting bracket for the equipment is not required, and the floor of the vehicle body can be lowered.

(B) When tightening or loosening the nut, the bolts for mounting the device do not rotate together, so that the workability for mounting and removing the device is good.

(C) The space in the underframe can be effectively used without being restricted as a piping space.

(D) With the configuration of the groove, the cross section of the transverse beam becomes large, the drag of the entire transverse beam against the torsional moment increases, and it is not necessary to take any special measures for strength.

(E) The processing of the piping hole provided in the side beam is simplified, and the processing operation can be simplified.

(F) Even if the bolt inserted into the groove receives the vibration of the running vehicle, it does not rotate in the loosening direction, and there is no danger that the equipment may fall off and cause a catastrophe.

[Brief description of the drawings]

1 is a plan view of the entire underframe showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II of FIG. 1, and FIGS. 3 (A) and 3 (B) are different from each other. 4 (A) and 4 (B) are bottom views showing different embodiments of the groove portion, FIG. 5 is a side view showing a device mounted state, and FIG. FIG. 7 is a plan view showing an example of a conventional underframe, FIG. 8 is a cross-sectional view taken along the line II of FIG. 7, FIG. 9 is a side view showing a state in which equipment is mounted, FIG. FIG. 11 is a front view showing a main part of equipment mounting, FIG. 11 is a plan view showing another example of the conventional underframe, FIG. 12 is a cross-sectional view taken along the line II of FIG. 11, and FIG. FIG. 14 is a side view showing an attached state of the device. DESCRIPTION OF SYMBOLS 1 ... Underframe, 2 ... Horizontal beam, 3 ... Groove, 3c ... Opposing opening, 3d ... Enlarged opening, 3e ... Space, 3f ... Step, 4
…… Bolt for equipment mounting, 4a …… Bolt head, 23 …… Equipment, 25 …… Piping hole, A, B …… Equipment mounting pitch, H …… Height from underframe upper surface to rail upper surface, S .... Underframe space.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Atsumi Iseda 2-13-13 Katayamacho, Suita-shi, Osaka No.4 North 201 201 (72) Inventor Isamu Kasai 2-1-1-18 Wadayama-dori, Hyogo-ku, Kobe-shi, Hyogo Prefecture Inside the Hyogo Plant of Kawasaki Heavy Industries, Ltd. (72) Inventor Osamu Komaki 2-1-1, Wadayama-dori, Hyogo-ku, Kobe City, Hyogo Prefecture Inside the Hyogo Plant of Kawasaki Heavy Industries, Ltd. (56) References U)

Claims (2)

(57) [Claims] 1. A pair of webs extending left and right and a flange bent inward from the lower ends of the pair of webs at the lower part in the longitudinal direction of a cross beam that constitutes an underframe installed in accordance with the interval between the device mounting portions. And a frame having a groove having an opening on the lower surface thereof, wherein the head of a bolt for mounting equipment to be inserted into the web is formed in a rectangular shape that cannot rotate in the web, and a short side of the rectangular side is formed. The length dimension was larger than the interval between the openings and slidable in the pair of webs, and the opening was provided with an enlarged opening having a width through which the short side of the head of the bolt could be inserted. An underframe for a vehicle, characterized in that: 2. A pair of webs extending left and right and a flange bent inward from lower ends of the pair of webs at a lower portion in a longitudinal direction of a cross beam that constitutes an underframe installed in accordance with an interval between device mounting portions. In the underframe having a groove having an opening on the lower surface thereof, a step portion having a width smaller than the interval between the pair of webs is provided on the inner surface of the flange in the web, and for mounting equipment inserted into the web. The head of the bolt is formed in a rectangle large enough to be rotatable within the web, and the length of the short side of the rectangle is a dimension that can be inserted through the opening, and the length of the long side of the rectangle is The underframe of a vehicle having a size larger than the interval between the openings and inserted into the step portion so as not to rotate.