JPH01186429A - Supporting structure for automobile power plant - Google Patents

Abstract

PURPOSE:To ensure holding performance of front glass by forming a guide section inclining rearward on a front frame thereby guiding a suspension cross member supporting a power plant rear-downward upon head collision of automobile. CONSTITUTION:A power plant 1 is supported by a suspension cross member 2 through a vibration isolator 3. The cross member 2 is fixed through bolts 6 to a front frame 5 extenting longitudinally at the opposite sides of an engine room 4. Furthermore, a guide section 7 inclining gradually rear-downward is formed in the rear of the fixing position of the cross member 2 on the front frame 5. Upon head collision, the cross member 2 to be moved through impact load is guided by the guide section 7 thus moving the power plant 1 rear- downward. Consequently, degradation of holding performance of front glass due to contact of the power plant with a cowl box 12 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a support structure for a power plant in an automobile.

(Prior art) Automotive power plants, for example,
As in Publication No. 21, it is supported by a suspension cross member via a vibration isolator, and this suspension cross member is extended in the longitudinal direction of the vehicle body on both sides of the engine compartment by inserting mounting bolts into round holes provided at both ends. It was attached to the front frame.

In addition, in order to improve the appearance of modern cars and reduce aerodynamic drag, there is a trend to reduce the angle of inclination of the windshield with respect to the horizontal line. The joint with the bonnet (-called the cowl point in boat fishing) comes forward,
The lower edge of the windshield is located close to the power plant.

If a car collides head-on with some kind of obstacle under these conditions, ideally the front frame would absorb the impact load and prevent it from reaching other parts, but the suspension cross member on which the power plant is mounted would absorb the impact load. Since the front frame has been reinforced and its rigidity has increased, the amount of collapse of the front frame due to a frontal collision is reduced, reducing its ability to absorb impact loads. The rear part of the car body was lifted up, and the car body was bent into an inverted mountain shape at the cowl point.
As the lower end of the windshield moves forward and downward as shown by the imaginary line in FIG. 6, the power plant is also pushed and moves backward and upward as shown by the imaginary line. There were problems such as contact with the lower end of the windshield, causing the windshield to become unbonded and impairing its holding performance.

(Objective of the Invention) This invention solves the above-mentioned conventional problems and increases the amount of impact load absorbed by the front frame (the amount of collapse of the front frame) during a collision, thereby suppressing the impact on other parts. Another object of the present invention is to provide a power plant support structure for an automobile that avoids contact between the cowl point and the power plant in the event of a collision and does not impair windshield retention performance.

(Structure of the Invention) In order to achieve the above object, the present invention is such that both ends of a suspension cross member supporting a power plant via a vibration isolator extend in the longitudinal direction of the vehicle body on both sides of the engine room. The suspension cross member is connected to the front frame, and the connection is configured to be released by a load exceeding a predetermined value. to guide downward,
This is a support structure for a power plant for an automobile, in which a guide portion is formed that slopes downward toward the rear.

In the case of a head-on collision with the above configuration, if the impact load exceeds a predetermined value, the suspension cross member will be disconnected from the front frame, and the front frame in that area will be reduced to its own rigidity, causing it to collapse. This increases the ability of the front frame to absorb the impact load caused by a collision, making it possible to prevent the impact from impacting other parts.Furthermore, the power plant, which retreats due to a collision, descends along the guide section provided in the front frame. , it is possible to avoid contact between the power plant and the lower end of the windshield, thereby preventing damage to the windshield holding performance.

(Embodiments) The present invention will be described in detail below based on embodiments shown in the drawings.

In Figures 1 to 4, (1) is a power plant (engine) that is supported by a suspension cross member (2) via vibration isolators (3). ) are bolts (6) that are attached at both ends to the lower side of the front frame (5) (5) that extends in the longitudinal direction of the vehicle on both sides of the engine compartment (4).
(6), and the suspension cross member (5) on the lower side of this front frame (5).
A guide portion (7) is formed at the rear of the mounting position 2), which slopes downward toward the rear.

(8) is a long suspension cross member (2) with two locations on each end of the suspension cross member (2).
5) This is for attaching to (5), and this long (8) has one end opened at the front edge of the suspension cross member (2), and has protrusions (9) facing on both sides. The mounting bolt (6) is positioned at the rear end of the elongated hole (8) during normal mounting.

Oo) With the hatash panel, the engine room (4) and
This dash panel 0
A cowl box 02) extending in the vehicle width direction is formed at the upper end of ω, and the lower end of a windshield 03) is connected to the upper side of the cowl box 0. 051 indicates a bonnet.

Figure 1 shows a state in which the power plant (1) is normally supported, and Figure 2 shows a case where a head-on collision occurs from this state.If the impact load is above a specified level, the power plant (1) is supported. The suspension cross member (2) also tries to move rearward due to the force trying to move it rearward, and the protrusion (9) in the elongated part (8) hits the mounting bolt (6).
The mounting bolts (6) are removed from the elongated holes (8) while remaining in the front frame (5), and the suspension cross member (2) moves rearward together with the power plant (1).

At this time, the suspension cross member (2) is guided by the guide portion (7) formed on the front frame (5) (5), and the power swing (1) is moved rearward and downward, as shown in Fig. 6. In this way, it is possible to avoid contacting the lower end of the windshield by moving backward and upward as in the conventional case.

In addition, since the suspension cross member (2) and the front frame (5) (5) are uncoupled, the rigidity of the front frame (5) (5) decreases to only its own rigidity, so it is difficult to prevent a frontal collision. This makes it easier to crush and crush as shown in section A in Figure 2, absorbing most of the impact load caused by the collision and preventing it from spreading to other parts of the vehicle body.

(Effects of the Invention) According to the power plant support structure for an automobile according to the present invention described above, the suspension cross member that supports the power plant is released from the front frame when a force exceeding a certain level is applied thereto. Because of this, if the front frame receives an impact load above a certain level during a frontal collision, the connections will be released and the front frame will be more likely to collapse, absorbing most of the impact load from the collision and reducing damage caused by the collision to other parts. At the same time, the power plant, which is pushed rearward due to a collision, is moved to the rear inclined lower surface by a guide part provided on the front frame, and the power plant is prevented from coming into contact with the lower edge of the windshield, and the front It is possible to ensure glass retention performance.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention. Figure 1 is a side view showing the support structure of a power plant that is normally supported, and Figure 2 is a frontal collision with the support structure shown in Figure 1. Figure 3 is a partially cutaway front view of the power plant shown in Figure 1 in a supported state; Figure 4 is a plan view of the suspension cross member; Figure 5 is a side view of the case where a conventional car has been involved in a head-on collision. FIG. 6 is a side view showing the deformation of the vehicle body and the movement of the power plant at the time of the collision shown in FIG.゛1... Power plant 2... Suspension cross member 5... Front frame 6... Mounting bolt 7... Guide part 8... Oblong hole
9... Protrusion Figure 1 Figure 6

Claims (1)

[Claims] Both ends of the suspension cross member supporting the power plant are connected to a front frame extending in the longitudinal direction of the vehicle body on both sides of the engine room, and the connection is made to be released when a load exceeding a predetermined level is applied. Further, the front frame is provided with a guide portion that slopes downward toward the rear for guiding the suspension cross member downward after the front frame and the suspension cross member are disconnected from each other. A support structure for an automotive power plant featuring: