JP2000177624A - Safety structure against collision of chassis frame of vehicles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety structure against the collision of chassis frame of vehicles for improving attaching strength of engine cross member structure in order to reduce the deformation of chassis frame of vehicles in a car breadth direction of side members when external forces act such as at collision of vehicles and the like, and for securing living space and improving safety of vehicles. SOLUTION: An engine cross member structure 5 is fixed on the lower surface of a side member 2 by bolts 10, 10a, 11, 11a and is provided with an engine cross member bracket 8 and an engine cross member 9 installed between them. The engine cross member bracket 8 is fixed on the side member 2 by bolts 10, 10a, 11, and 11a. A stopper pin 1 is installed at the vicinity of the bolt 10 almost on the axis of the engine cross member 9 to secure the tightening of the engine cross member bracket 8 and the side members 2. Accordingly, the falling-out or shear failure of the bolt 10 and the like can be prevented and the separation of the engine cross member structure 5 from the side member 2 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents a bolt for tightening an engine cross member bracket from dropping off or shearing breakage due to deformation of a side member when an external force is applied in a collision or the like, and reduces deformation of the side member. The present invention relates to a vehicle chassis frame collision safety structure capable of ensuring vehicle safety.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, a chassis frame of a vehicle has a substantially U-shaped cross section and is provided with left and right side members 2, 2 which are arranged at appropriate intervals in the vehicle width direction, and is bridged therebetween. Cross members 3, 4 and engine cross member structure 5 '
And so on. In particular, the engine cross member structure 5 'functions as a cross member and holds the engine 6, and is arranged, for example, near the inflection portion 7 of the side member 2 as shown in FIG. The engine cross member structure 5 'includes an engine cross member bracket 8 fixed to the side member 2, and an engine cross member 9 installed between the left and right engine cross member brackets 8, 8. The engine cross member bracket 8 is provided with an engine mount bracket 8a for supporting the engine.

As shown in FIGS. 3 and 4, the engine cross member bracket 8 is fixed to the side member 2 by, for example, bolts. More specifically, the bolts are composed of two bolts 10, 10a on the front side and two bolts 11, 11a on the rear side, and these four bolts 10, 10a, 11, 11a are used for engine crossing. The member bracket 8 is fixed to the side member 2. In addition,
The bolts 10 and 10a on the front side are arranged near the inflection portion 7, and the bolts 10 are arranged substantially on the axis of the engine cross member 9.

[0004]

The engine cross member bracket 8 is provided with the bolts 10, 10a, 11, 11a.
Thus, the side member 2 is bent and deformed in the vehicle width direction when a large external force acts upon a collision or the like. Although the deformation of the side member 2 due to this force is suppressed by the engine cross member structure 5 ′, a considerably large force acts on the bolts 10, 10 a, 11, 11 a, and particularly, is substantially on the axis of the engine cross member 9. A large force acts on the bolt 10.
On the other hand, since the flatness of the inflection portion 7 of the side member 2 is small, the engine cross member bracket 8 and the side member 2 can be fastened even if the front bolts 10 and 10a are fastened considerably.
May not be sufficient, and as a result, there may be a possibility that a larger force acts on the bolts 10 and 10a than the bolts 11 and 11b. If it is assumed that the bolt 10 loses the external force and breaks, the other bolts 10a, 11, 11a must bear the external force, and depending on the magnitude of the external force, the bolts 10a, 11, 11a sequentially break. Thus, as shown in FIG. 5, there is a possibility that the engine cross member bracket 8 on one side may be detached from the side member 2. Furthermore, it is not unlikely that the engine cross member structure 5 'does not function as a cross member, the amount of deformation of the side member 2 in the vehicle width direction increases, and the cab living space may become narrow.

There are many known techniques relating to an engine cross member structure for supporting an engine. For example, Japanese Utility Model Laid-Open No. 4-110616 is known. This "rear mount structure of the engine" supports the engine by a relatively high rigidity engine mount member, and both ends of the engine mount member are fixed to the frame side member side by a high rigidity engine mount bracket. This fixing is performed by bolts, but since the bolt mounting portion is flat, considerable tightening force is generated. Therefore, with this structure, the engine mount member is unlikely to be detached from the frame side member side due to the loosening of the bolt when an external force is applied. However, even in this case, there is a possibility that the same result as that of the above-described prior art may occur depending on the mounting position of the engine mount bracket.

[0006] The present invention has been made in view of the above circumstances, and even when a large external force is applied such as at the time of a collision or the like, the bolts do not suffer from the shearing failure of the bolts and the like. The engine cross member structure functions as a cross member,
An object of the present invention is to provide a vehicle chassis frame collision safety structure in which deformation of a side member is reduced, a living space is secured, and vehicle safety is improved.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides a vehicle chassis frame having a substantially U-shaped cross section and left and right side members arranged at predetermined intervals in the vehicle width direction. Applied to an engine cross member structure including an engine cross member bracket fixed to the engine cross member by bolts and an engine cross member provided between the engine cross members, to ensure the safety of the chassis frame at the time of an external force such as a collision. The engine cross member bracket is fixed to the side member by a plurality of bolts, and a stopper for fixing the engine cross member bracket to the side member side between the bolts is provided. It constitutes the chassis frame collision safety structure of the vehicle in which the pin is interposed. . More specifically, the engine cross member bracket is fixed near an inflection portion of a side member, and the stopper pin is disposed between a bolt disposed substantially on the axis of the engine cross member and a bolt adjacent thereto. It is characterized by being performed.

By interposing a stopper pin between a bolt on the axis of the engine cross member and a bolt adjacent thereto, an external force applied to the bolt is borne by the stopper pin. Therefore, the bolt is prevented from being loosened or sheared. Further, since the stopper pin is disposed on the substantially flat contact surface between the engine cross member bracket and the side member near the inflection portion, the stopper pin exerts a strong locking force. Therefore, the effect of sufficiently preventing the shear fracture of the bolt can be improved. According to the present invention, the deformation of the side member when an external force acts can be reduced by a very simple means of simply providing a stopper pin.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle safety frame collision safety structure according to an embodiment of the present invention. As shown in FIG. 1, in the present embodiment, a case will be described in which an engine cross member structure 5 relating to a vehicle chassis frame collision safety structure of the present invention is arranged near an inflection portion 7 of a side member 2. Note that the present invention is similarly applied to a flat portion other than the inflection portion 7 of the side member 2, but it is a matter of course that the inflection portion 7 can further enhance the effect.

As shown in FIGS. 1 and 2, the side member 2 has a substantially U-shaped cross section. A closing plate 2a is welded to the inner surface of the side member 2 to form a closed box-shaped cross section as a whole. Consisting of The engine cross member structure 5 of the present embodiment is provided by bolting to the lower surface of the side member 2 near the inflection portion 7 of the side member 2 having the above structure. In the inflection portion 7, the side members 2 are connected by a gentle curve, and the area of the cross section gradually changes. The engine cross member structure 5 includes an engine cross member bracket 8 tightly bolted to the lower surface of the side member 2 and an engine cross member 9 installed between the left and right engine cross member brackets 8,8.

The engine cross member bracket 8 includes a mounting plate portion 8b that is bolted in close contact with the lower surface of the side member 2, and an engine mount bracket 8a that supports the engine 6. Note that both ends of the engine cross member 9 are fixed to the engine mount bracket 8a.

As shown in FIGS. 1 and 2, the mounting plate 8b has its front side and rear side fixed to the lower surface of the side member 2 by two bolts 10, 10a and bolts 11, 11a. 1 is attached. In the present embodiment, the stopper pin 1 is
Is disposed between the bolt 10a on the front side and the bolt 10a, which are arranged substantially on the axis. More specifically, since the portion where the bolt 10 is tightened substantially corresponds to the inflection portion 7, a slight gap is formed between the lower surface of the side member 2 and the mounting plate portion 8b. However, tightening the bolt 10 makes this gap almost zero, but the bolt 10
Since the tightening force is partially used to eliminate the gap, the tightening strength of the mounting plate portion 8b at this portion is low. On the other hand, a portion to which the stopper pin 1 is attached becomes flat by at least the tightening of the bolt 10, and by inserting the stopper pin 1 into this portion, an effect of sufficiently preventing the shear fracture of the bolts 10 and 10a can be exerted. .

When an external force acts on the engine cross member structure 5 'having the conventional structure, especially when the bolt 10
A large force acts intensively. However, in the case of the engine cross member structure 5 of the present embodiment, the stopper pin 1 is provided near the bolt 10 and the mounting plate 8
Since b is firmly held on the lower surface of the side member 2, the force acting on the bolt 10 is complemented by the stopper pin 1, and as a result, the bolt 10 does not loosen. Bolt 1
If there is no slack of 0, other bolts 10a, 11, 11a
No slack occurs. Therefore, in this embodiment, FIG.
Does not separate from the side member 2 of the engine cross member structure 5 '. As a result, the engine cross member structure 5 functions as a cross member, and reduces the deformation of the side members 2 in the vehicle width direction. Thereby, the deformation of the entire chassis frame is also reduced, and the reduction of the living space is prevented, so that the safety of the vehicle can be ensured.

In the above description, the engine cross member bracket 8 has two bolts 1 on the front side and the rear side.
It is fixed by 0, 10a and 11, 11a, but it is not limited to this. Further, the mounting position, the number, and the shape of the stopper pins 1 are not limited to those described above and those illustrated.

[0015]

According to the first aspect of the present invention, the engine cross member bracket to be bolted is fixed to the side member by the stopper pin in addition to the bolt. Accordingly, the bolt is prevented from being sheared and broken when an external force is applied, and the bolt is not detached from the side member of the engine cross member structure due to the breakage of the bolt. Therefore, the engine cross member structure functions as a cross member to reduce the deformation of the chassis frame, prevent a reduction in living space, and ensure vehicle safety. 2) According to the vehicle chassis frame collision safety structure according to the second aspect of the present invention, the stopper pin is disposed between the bolt substantially on the axis of the engine cross member and the adjacent bolt. The applied force is complemented by the stopper pin, and the bolt is prevented from falling off or broken, thereby ensuring safety.

[Brief description of the drawings]

FIG. 1 is a side view showing a detailed structure of a chassis frame collision safety structure of a vehicle according to the present invention.

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a plan view showing a mounting structure of a conventional engine cross member structure.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a schematic view showing a deformed state of a conventional chassis frame when an external force is applied, and a state in which the conventional chassis frame is detached from a side member of an engine cross member structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stopper pin 2 Side member 2a Closing plate 3 Cross member 4 Cross member 5 Engine cross member structure 6 Engine 7 Inflection part 8 Engine cross member bracket 8a Engine mount bracket 8b Mounting plate 9 Engine cross member 10 Bolt 10A Bolt 11 Bolt 11A bolt

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Yamaguchi 8 Tsuzuna, Fujisawa-shi, Kanagawa Prefecture Isuzu Motors Fujisawa Plant (72) Inventor Ryuji Oguro 8-8 Dozana, Fujisawa-shi, Kanagawa Isuzu Motors Fujisawa Co., Ltd. Inside the factory (72) Inventor Hiroyuki Kuniki 3-1-1, Eminokita, Eniwa-shi, Hokkaido Isuzu Motors Corporation Hokkaido Development Center

Claims (2)

[Claims] 1. An engine cross member bracket which forms a chassis frame of a vehicle, has a substantially U-shaped cross section, and is fixed to left and right side members arranged at predetermined intervals in a vehicle width direction by bolts, and the engine cross member bracket. A chassis frame collision safety structure for a vehicle, which is applied to an engine cross member structure including an engine cross member provided between the engine and a vehicle, for ensuring safety of the chassis frame when an external force is applied such as in a collision. The cross member bracket is fixed to the side member by a plurality of bolts, and a stopper pin for fixing the engine cross member bracket to the side member is interposed between the bolts. Safety structure. 2. The engine cross member bracket is fixed near an inflection portion of a side member, and the stopper pin is disposed between a bolt disposed substantially on an axis of the engine cross member and a bolt adjacent thereto. The vehicle safety frame collision safety structure according to claim 1, wherein: