JP2985712B2 - Engine mount structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle engine mount structure.

[0002]

2. Description of the Related Art As shown in FIG. 1 (A), an engine mount structure for mounting an engine in an engine room at a front part of a vehicle includes a pair of right and left front side members 1 which are installed between left and right front side members 1 as shown in FIG. A sub-frame 2 including a suspension member 20 and a pair of support members 21 is formed, and an engine is mounted on an engine mount bracket 3 provided on an upper surface of the support member 21 via a vibration-proof rubber material. .

[0003] This type of engine mount structure is a structure independent of the body skeleton, and it is necessary to increase the rigidity in order to suppress engine vibration and its transmission and noise. Therefore, as shown in FIG. 3, the engine mount bracket 3 and the front side member 1, which is the frame of the body, are provided on the first retainer 5 </ b> A projecting outward from the engine mount bracket 3 and on the upper surface of the front side member 1. A structure is employed in which the suspension upper arm support bracket 4 provided is bolted and connected to a second retainer 5B protruding from the provided suspension upper arm support bracket 4.

[0004]

However, an upper arm support member 42 for supporting the upper arm of the suspension is bolted to the center of the suspension upper arm support bracket 4. The first and second retainers 5A and 5B are narrower due to space limitations because the second retainer 5B protrudes from the lower part avoiding the above. In addition, both retainers 5
The connecting portion 7 of A, 5B is at a position lower than the engine support surface 31 of the engine mount bracket 3. Therefore, a force that causes the engine mount bracket 3 to be deformed in the rotational direction about the connecting portion 7 by the transmission of the engine vibration acts on the engine mount bracket 3, and the noise vibration performance in the vehicle body is not good.

Therefore, the present invention realizes an engine mount structure which can increase the width of a retainer connecting the engine mount bracket and the suspension upper arm support bracket to increase the coupling rigidity and minimize the force acting on the engine mount bracket. The object of the present invention is to improve the noise and vibration performance of the vehicle body.

[0006]

According to the present invention, as shown in FIG. 1, a pair of parallel suspension members 20 extending in the vehicle width direction between left and right front side members 1 are provided. An engine mount bracket that forms a sub-frame 2 with a pair of parallel support members 21 extending in the vehicle front-rear direction along the front side member 1 and protrudes obliquely inward and upward on the upper surface near the center of each of the support members 21. 3, and the bracket 3 and the suspension upper arm support bracket 4 provided on the front side member 1 are connected by a retainer 5 so that the engine mount bracket 3 is provided.
In reinforcing the engine mount structure, the retainer 5, a first retainer 5A projecting from the engine mount bracket 3 outward diagonal direction, the suspension
Pension upper arm support bracket 4 together with the upper arm supporting member 42 and fastened together comprise a second retainer 5B which allowed position in the protruding direction above the first retainer 5A. And both retainers 5A,
5B is bolted and fixed at its opposite end, and at least one of the bolting locations is attached to the engine mounting bracket
Is positioned higher than the engine support surface 31.

The two retainers 5A and 5B are made of a plate material whose width is increased in the vertical direction in a direction facing each other.
It is desirable that the opposing ends be overlapped and bolted and fixed at a plurality of locations.

Further, as shown in FIG. 2, it is desirable to provide a third retainer 6 between the front side member 1 and the support member 21 for connecting these bottom surfaces.

[0009]

The second retainer 5B is attached to the suspension upper arm support bracket 4 by the upper arm support member 4.
2 together with the first retainer 5B together with the second retainer 5B.
A can be widened. Therefore, both retainers 5A,
Since at least a part of the connecting portion of 5B can be located above the engine support surface 31 of the engine mount bracket 3, deformation of the engine mount bracket 3 in the rotation direction can be suppressed. Further, a third space is provided between the front side member 1 and the bottom surface of the support member 21.
By using the retainer 6, the deformation of the engine mount bracket 3 in the rotation direction can be more completely prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1 (A), a pair of front and rear suspension members 20 are provided between the pair of left and right front side members 1 extending in the vehicle front-rear direction.
A pair of support members 21 is provided between the two suspension members 20 along the inside of the front side member 1 to form the subframe 2, and the subframe 2 is configured to support an unillustrated engine and suspension.

As shown in FIGS. 1 (A) and 1 (B), each of the support members 21 is provided with an engine mount bracket 3 having a closed-section structure projecting obliquely upward and inward.

On the upper surface of the engine mount bracket 3, a first retainer 5A that rises obliquely outward and upward.
Is protruding. The first retainer 5A is a triangular plate body, one side of which is connected to the inclined upper surface of the engine mount bracket 3 and has a shape that spreads in the front end direction, and the front end edge has a gap between the front side member 1 and the support member 21. It extends vertically at almost the middle position.

On the other hand, on the upper surface of the front side member 1,
A suspension upper arm support bracket 4 is fixed at a position facing the engine mount bracket 3. The bracket 4 is a front side member 1
A first panel 40 rising from the outer side surface and a second panel 41 bridging the upper end thereof and the upper end of the inner side surface of the front side member 1 form a closed cross-sectional structure having a triangular cross section on the upper surface of the front side member 1, An upper arm support member 42 is fixed to the second panel 41 with bolts.
A second retainer 5B facing the first retainer 5A is integrally fixed to the second panel 41 together with the upper arm support member . That is,
The second retainer 5B is a plate body that is located above the first retainer 5A in the protruding direction and has a width that increases in the direction of the first retainer 5A. Upper and lower arm support members 4
2 penetrates the upper arm support member 42 with the
Bolts are bolted fixed.

The first retainer 5A and the second retainer 5B are vertically overlapped with each other at the leading edge, and
It is fixed by bolting at points 7A and 7B. The position of the bolt fastening portion 7 </ b> A above is located above the engine support surface 31 of the engine mount bracket 3.

According to the structure of the above-described embodiment, the second retainer 5B is connected to the suspension upper arm support bracket.
By tightening together with the upper arm supporting member 42 to the ket 4, the position is higher than in the related art, so that the width of the joint between the first and second retainers 5A and 5B can be increased. For this reason, the coupling portion can be bolted and fixed at a plurality of upper and lower locations, and the upper bolting position can be located above the engine support surface 31 of the engine mount bracket 3. Rigid joint due to wide joint
Raise the sex, the point of attachment by an upper, to prevent rotation of the engine mount bracket 3 around the coupling portion, has been vibration, it can be reduced noise.

FIG. 2 shows a second embodiment, in which a bottom surface of a front side member 1 and a bottom surface of a support member 21 are bridged by a third retainer 6 of a plate shown in FIG. 2B. I do. That is, as shown in FIG. 2C, one end of the third retainer 6 is fixed to the bottom surface of the support member 21 by welding, and the other end is fixed to the bottom surface of the front side member 1 by bolting. Other structures are the same as those of the first embodiment. In this embodiment, when the engine is operating,
Rotational deformation of the engine mount bracket 3 around the joint of the first and second retainers 5A and 5B is prevented, and the center of the tip of the second retainer 5B fastened together with the upper arm support member 42 is centered. Retainers 5A and 5B and engine mount bracket 3
Is prevented from being rotationally deformed, and vibration and noise can be further reduced.

The vibration deformation of the engine mount structures of the first and second embodiments of the present invention and the conventional engine mount structure is analyzed by the finite element method (FEM), and the results are shown in FIG. In FIG. 4, the solid line indicates the analysis result of the first embodiment of the present invention, the dotted line indicates the analysis result of the second embodiment of the present invention, and the dashed dotted line indicates the analysis result of the conventional structure. As shown in FIG. 4, the vibration acceleration of the structure of the first embodiment of the present invention has a lower resonance maximum value and a lower average value than the conventional structure. It can be seen that in the structure of the second embodiment of the present invention, the resonance maximum value and the numerical value are further reduced on average. Therefore, it is understood that the structure of the present invention has a vibration reducing effect.

[0018]

According to the engine mount structure of the present invention, it is possible to increase the rigidity of the engine mount portion with a simple structure, suppress the vibration of the engine mount portion due to the vibration of the engine, and thereby reduce the vehicle body noise. it can.

[Brief description of the drawings]

FIG. 1A is a plan view showing an engine mount structure according to a first embodiment of the present invention, and FIG. 1B is a plan view of FIG.
It is sectional drawing in the position along IB-IB line.

FIG. 2A is a plan view showing an engine mount structure according to a second embodiment of the present invention, FIG. 2B is a perspective view of a third retainer used in the embodiment, and FIG. Figure 2)
It is sectional drawing in the position along IIC-IIC line of (A).

FIG. 3 is a sectional view of a conventional structure corresponding to FIG.

FIG. 4 is a diagram showing an FEM analysis result with respect to engine vibration.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Front side member 2 Subframe 20 Suspension member 21 Support member 3 Engine mount bracket 31 Engine support surface 4 Suspension upper arm support bracket 42 Upper arm support member 5 Retainer 5A First retainer 5B Second retainer 6 Third retainer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-118325 (JP, A) JP-A-61-169826 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60K 5/00-5/12 B62D 21/00 B62D 25/00-25/08 B62D 25/14-25/22 F16F 15/08

Claims (3)

(57) [Claims] 1. A pair of parallel suspension members spanning in the vehicle width direction between left and right front side members, and a pair of parallel support members spanning both ends of the suspension members along the front side members in a vehicle longitudinal direction. And a sub-frame, and an engine mount bracket projecting obliquely upward and inward is provided on the upper surface near the center of each of the support members, and the bracket and the suspension upper arm support bracket provided on the front side member are connected by a retainer. In the engine mount structure in which the engine mount bracket is reinforced, the retainer projects from the engine mount bracket in an obliquely outward direction, and the suspension upper arm support bracket has an upper arm. Configured to fastened together the arm support member integral with the second retainer was allowed position in the protruding direction above the first retainer, bolting and fixing the both retainers at its opposite ends, and bolted positions An engine mount structure characterized in that at least one of the two is positioned higher than the engine support surface of the engine mount bracket. 2. The engine mount structure according to claim 1, wherein said retainers are made of a plate material whose width is increased in the vertical direction in a direction facing each other, and the opposite ends are overlapped and bolted and fixed at a plurality of positions. 3. The engine mount structure according to claim 1, further comprising a third retainer between said front side member and said support member, said third retainer connecting said bottom surfaces thereof.