JPH077258Y2 - Vehicle engine mount support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vehicle engine mount support structure.

(Prior Art) A vehicle having a monocoque body generally has a structure in which an engine is supported by an engine mount fixed on a frame member of the monocoque body.

FIG. 4 is a front view showing a conventional engine mount support structure for a vehicle having this type of configuration.

In the figure, the dash cross member 1 is one of the skeletal members of a monocoque body, and is arranged in the vehicle width direction below a dashboard (not shown) that separates the engine room from the driver's seat. Are also connected to the left and right side members 2 which are the frame members of the monocoque body.

An engine mount 4 is fixed to a central position on the dash cross member 1 via a bracket 3, and a part of the engine arranged in the engine room is supported by the engine mount 4. In FIG. 4, reference numeral 5 denotes a suspension member below the dash cross member 1 and arranged between the side members 2 in proximity to the dash cross member 1.

(Problems to be Solved by the Invention) However, in the conventional engine mount support structure shown in FIG. 4, since the support part of the engine mount 4 is located away from the side member 2, the rigidity of the support part is not sufficient. Therefore, the bending resonance of the dash cross member 1 (the bending vibration mode of the dash cross member 1 over the vehicle width direction is schematically shown in FIG. 5 in association with the dash cross member 1) and the torsional resonance are caused inside the vehicle. There was a problem that the noise in the room became loud.

(Object of the Invention) The present invention has been made to solve the above problems, and an object thereof is to provide an engine mount support structure for a vehicle that can reduce the generation of noise from the engine mount support. .

(Means for Solving the Problem) The present invention provides a cross member between a pair of side members,
In order to achieve the above-mentioned object in a vehicle in which a suspension member is hung around the suspension member and an engine mount is mounted at a substantially central position of the cross member, in order to achieve the above object, at a position substantially corresponding to the engine mount, the cross member and the suspension member A stay is installed between and.

(Operation) In the vehicle engine mount support structure according to the present invention, since the stay is connected between the cross member and the suspension member at a position substantially corresponding to the engine mount, the rigidity of the engine mount fixing portion is improved. However, noise generation from the engine mount fixing part is reduced.

(Embodiment) FIG. 1 is a vertical sectional view showing a vehicle engine mount support structure according to an embodiment of the present invention, and FIG. 2 is a front view of the engine mount support structure.

1 and 2, the dash cross member 11
Is a skeletal member of the monocoque body and is a dash cross member 16 that separates the engine mount from the driver's seat.
Is disposed in the lower part of the vehicle in the vehicle width direction, and both ends thereof are connected to the left and right suspension members 12 which are skeletal members of the monocoque body as shown in FIG.

At a central position on the dash cross member 11, a bracket 13 of an engine mount 14 is fastened and fixed by a bolt 17. The engine mount 14 is configured such that a center pin 14b is arranged at an axial center position of a cylindrical housing 14a and an elastic body 14c is interposed in a space between the center pin 14b and the housing 14a. Then, a bracket 18a extending from a part of the engine 18 arranged in the engine room as shown by a phantom line in FIG. 1 is connected to the center pin 14b of the engine mount 14, whereby a part of the engine 18 is formed. Is supported by the engine mount 14.

On the other hand, below the dash cross member 11, a suspension member adjacent to the dash cross member 11 is provided.
15 are arranged in the width direction of the vehicle, and both ends are the second
As shown in the figure, it is connected to the left and right side members 12. The lower surface of the dash cross member 11 on which the engine mount 14 is fixed and the central position of the upper surface of the suspension member 15 facing the engine mount 14 are connected by a stay 19. That is, the upper end of the stay 19 is fastened and fixed to the lower surface of the dash cross member 11 by the bolt 20, and the lower end of the stay 19 is fastened and fixed to the upper surface of the suspension member 15 by the bolt 21.

In this way, the stay 19 is provided between the fixed part of the engine mount 14 of the dash cross member 11 and the suspension member 15.
Engine mount by connecting with
14 The rigidity of the fixed part can be improved. Therefore, the resonance of the dash cross member 11 due to the driving of the engine 18 is suppressed to that extent, and the noise level is reduced.

FIG. 3 shows the level of noise generated from the engine room (indicated by a broken line in the figure) in the case of the engine mount support structure of this embodiment and the noise level in the case of the conventional engine mount support structure (indicated by a solid line in the figure). FIG. In the figure, the vertical axis represents the noise level (dB), and the horizontal axis represents the engine speed (rpm) of the engine 18. As is apparent from FIG. 3, the peak portion of the noise level due to the resonance (indicated by the symbol A in the figure) observed in the conventional example is eliminated in the case of the embodiment, which reduces the noise level. You can see that it is done. According to the experiments by the inventors, in the case of the embodiment, the noise in the engine room, that is, the muffled sound is reduced by 3 to 4 dB as compared with the case of the conventional example, and the transmitted sound transmitted from the engine room to the outside of the vehicle is reduced. Is 2 dB compared to the case of the conventional example
It has been confirmed to decrease.

(Effect of the Invention) As described above, according to the engine mount support structure for a vehicle of the present invention, the stay is continuous between the cross member and the suspension member at a position substantially corresponding to the engine mount. The rigidity of the mount fixing portion is improved, and the level of noise generated from the engine mount fixing portion can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a vehicle engine mount support structure according to an embodiment of the present invention, FIG. 2 is a front view of the engine mount support structure, and FIG. FIG. 4 is a graph showing a comparison with the noise level in the case of an example, FIG. 4 is a front view showing an engine mount support structure of a conventional vehicle, and FIG. 5 is a schematic view showing a vibration mode of a dash cross member in the engine mount support structure. It is a figure. 11 …… Dash cross member, 12 …… Side member, 14
…… Engine mount, 15 …… Suspension member,
19 ... Stay

Claims (1)

[Scope of utility model registration request] 1. A cross member between a pair of side members,
In a vehicle in which a suspension member is bridged to the lower position of the cross member, and an engine mount is attached to a substantially central position of the cross member, between the cross member and the suspension member at a position substantially corresponding to the engine mount. A vehicle engine mount support structure characterized in that a stay is attached to the vehicle.