JP4389448B2 - Power unit support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In particular, the present invention relates to a power unit support structure suitable for use in a front engine / front drive type automobile (F / F type car).
[0002]
[Prior art]
Conventionally, in a vehicle in which a power unit composed of an engine body and a transmission is mounted in the engine room sideways with respect to the longitudinal direction of the vehicle body as in such an automobile, an engine mount as a mount member is used as a vibration isolation support method for the power unit. A so-called cross mount system that supports this power unit at four points is widely adopted by arranging it on the frame on the vehicle body side.
[0003]
Incidentally, as a frame on the vehicle body side, a pair of front side members extending in the front-rear direction on both sides of the vehicle body, a main front cross member extending between the front end portions of these front side members, A pair of sub-frames extending in the longitudinal direction of the lower vehicle body, a sub-front cross member extending between the front end portions of these sub-frames, and a sub-rear cross member extending between the rear end portions of these sub-frames It is common to be comprised with these.
[0004]
And this cross mount system, for example, supports both sides of the power unit to the front side member via the engine mount, and the front and rear of the lower side of the power unit are connected to the main front cross at the center of the engine room. This structure supports the center cross member straddling between the member and the sub-rear cross member via the engine mount.
[0005]
However, in such a structure, there is a risk that the engine mount provided at the front and rear of the lower side of the power unit may generate vertical vibrations due to engine swing during idling, which is disadvantageous in sound vibration performance. It was.
[0006]
Therefore, in recent years, as an anti-vibration support method for the power unit, an engine mount is disposed above the center of gravity of the engine on both sides of the power unit. The pendulum mount system is employed in which the engine mount is disposed below the center of gravity of the engine in the front-rear direction of the power unit to suppress the swinging motion.
[0007]
For example, Patent Document 1 discloses a structure in which both sides of a power unit are supported by a front side member via an engine mount, and a torque rod is supported between a lower part of the rear side of the vehicle body and a sub-rear cross member. Is disclosed.
[0008]
[Patent Document 1]
JP 2002-362175 A (FIGS. 7 and 8)
[0009]
[Problems to be solved by the invention]
However, this pendulum mount system has a structure in which the power unit is mounted at a position higher than the cross mount system on both sides, so the vertical distance between the engine mount and the power unit fixing point becomes longer. There is a possibility that the stability at one power unit fixing point is lowered, that is, the mounting rigidity between the power unit and the vehicle body is lowered.
[0010]
Therefore, it is difficult to suppress the vibration in the longitudinal direction of the vehicle body that occurs from the power unit fixing point as a base point with the torque rod provided in the lower part on the rear side of the power unit, and there is a risk that the sound vibration performance at the time of acceleration of the vehicle is deteriorated. .
[0011]
Therefore, the present invention has been made in view of such conventional problems, and provides a power unit support structure that can increase the mounting rigidity between the power unit and the vehicle body and can significantly improve the sound vibration performance during acceleration of the vehicle. For the purpose.
[0012]
[Means for Solving the Problems]
In the present invention, in the power unit support structure in which the power unit arranged in a direction transverse to the longitudinal direction of the vehicle body is supported on the vehicle body side frame via the mount member coupled to the engine main body of the power unit, the engine mount A bracket and a mounting stay extending across the side from the vehicle body front side to the rear side of the power unit, and the mount member is coupled to the engine body via the engine mount bracket and the mounting stay The engine mount bracket includes a lower portion connected to the engine body, and an upper portion connected to the mount member and the mounting stay. The mounting stay is applied with a load from the front of the vehicle body. Power unit If moved backward to rear of the vehicle body, has a guide portion for guiding the brake master cylinder provided in the rear of the vehicle body of the power unit and the vehicle body width direction, and the mounting stay, the vehicle front side of the engine body and the rear side And to be combined.
[0013]
【The invention's effect】
According to the present invention, by providing a mounting stay straddling through the side portion from the vehicle body front side to the rear side of the power unit, and connecting the mounting stay to the vehicle body front side and the rear side of the power unit, The mounting stay that supports the power unit on the frame on the vehicle body and the rigidity of the power unit can be improved, and vibration generated in the longitudinal direction of the vehicle can be effectively suppressed, so the mounting rigidity between the power unit and the vehicle is increased. Thus, it is possible to provide a power unit support structure capable of remarkably improving the sound vibration performance during acceleration of the vehicle.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0015]
1 to 3 show an embodiment of a power unit support structure according to the present invention, FIG. 1 is a top view showing a schematic configuration of the power unit support structure of the present invention, and FIG. 2 is a perspective view of the power unit support structure in FIG. FIG. 3 is a top view showing the behavior of the power unit when a load is applied from the front of the vehicle body in the power unit support structure of FIG.
[0016]
In FIG. 1, reference numeral 10 denotes a power unit in which an engine main body 11 and a transmission 12 are integrally provided, and is disposed in a transverse direction with respect to the longitudinal direction of the vehicle body in an engine room at the front of the vehicle body.
[0017]
The power unit 10 is supported by a frame at the front of the vehicle body. The frame includes a main frame 13 that supports the automobile body, and a sub-frame 14 that is disposed below the main frame 13 and coupled to the main frame 13.
[0018]
The main frame 13 is connected to a pair of front side members 13R, 13L extending in the front-rear direction on both sides of the vehicle body and the front end portions of the front side members 13R, 13L. And a main rear cross member (not shown) extending in the vehicle body width direction by connecting the rear end portions of the front side members 13R and 13L.
[0019]
The sub-frame 14 is positioned below the front side members 13R and 13L and extends in the longitudinal direction of the vehicle body and connects between the left and right sub-side members 14R and 14L and the front end portions of the sub-side members 14R and 14L to connect the vehicle body width. A sub-front cross member 14F extending in the direction (vehicle body right side, vehicle body left side) and a sub-rear cross member 14RE extending in the vehicle body width direction by connecting the rear end portions of the sub side members 14R, 14L are provided.
[0020]
The left and right engine mounts MT1 and MT2 that are mount members are disposed on the main frame 13, and the torque rod 15 is disposed at the lower part of the rear side of the vehicle body in the power unit 10, and the power unit 10 is configured by the engine mounts MT1 and MT2 and the torque rod 15. Is supported.
[0021]
Specifically, as shown in FIG. 2, the right engine mount MT1 has a substantially trapezoidal shape, for example, and is disposed on the front side member 13R on the right side of the vehicle body, and the engine of the power unit 10 via the engine mount bracket 16 and the mounting stay 17. It is combined with the main body 11. The left engine mount MT2 (FIG. 1) is disposed on the front side member 13L (FIG. 1) on the left side of the vehicle body, and is coupled to the transmission 12 of the power unit 10 via the engine mount bracket 18.
[0022]
At this time, the engine mount bracket 16 disposed on the front side member 13R on the right side of the vehicle body includes a lower portion 16a connected to the engine main body 11 and an upper portion 16b connected to the engine mount MT1 and the mounting stay 17. The lower portion 16a is connected to the engine body 11 by the connection pin 19, the upper portion 16b is connected to the engine mount MT1 by the connection pin 20, and the upper portion 16b is connected to the mounting stay 17 by the connection pin 21. ing.
[0023]
The torque rod 15 is coupled to a lower part of the power unit 10 on the vehicle body rear side of the power unit 10 via a rear engine mount bracket (not shown). The engine body 11 and the sub-rear cross member 14RE (FIG. 1). ) Extending in the longitudinal direction of the vehicle body and connected to each other, and the roll rigidity of the power unit 10 with respect to the input in the roll direction is given.
[0024]
Here, the mounting stay 17 has a C-shape when viewed from above, and extends from the front side to the rear side of the engine main body 11 of the power unit 10 via the side surface of the engine main body 11. And on the rear side, they are coupled via mounting brackets 22 and 23, connection pins 24 and 25, and the like. Incidentally, reference numeral 26 in the drawing denotes a connection pin for connecting the mounting bracket 23 provided on the vehicle body rear side of the power unit 10 to the engine body 11.
[0025]
In the case of this embodiment, the mounting stay 17 is provided with a guide portion 17 a that is inclined from the vehicle body width direction to the vehicle body center side on the vehicle body rear side of the engine body 11.
[0026]
As shown in FIG. 3, when the load F is applied from the front of the vehicle body and the power unit 10 moves backward to the rear side of the vehicle body, the guide portion 17a moves the brake master cylinder 30 provided on the rear side of the engine body 11 to the vehicle body. It is possible to prevent the interference with the engine main body 11 by guiding in the width direction.
[0027]
As described above, according to the power unit support structure, the engine mount MT1 having a substantially trapezoidal shape is disposed on the front side member 13R on the right side of the vehicle body, and the engine mount MT1 has a C-shape when viewed from above. By connecting the engine main body 11 of the power unit 10 via the mounting stay 17 and the engine mount bracket 16 that extend over the side of the engine main body 11 from the front side to the rear side of the vehicle body 11, the power unit 10 and the mounting stay 17 that supports the power unit 10 on the vehicle body side frame (the front side member 13R on the right side of the vehicle body) can be improved, and vibration generated in the longitudinal direction of the vehicle body can be sufficiently suppressed in practice. And thus Poweryu Enhance the mounting rigidity of the Tsu bets 10 and the vehicle body, the sound vibration performance during acceleration of the vehicle can be improved with remarkably.
[0028]
Further, according to this power unit support structure, since the mounting stay 17 is provided with the guide portion 17a that is inclined from the vehicle body width direction to the vehicle body center side on the vehicle body rear side of the engine body 11, the guide portion 17a is When the load F is applied from the front of the vehicle body and the power unit 10 moves backward to the rear side of the vehicle body, the brake master cylinder 30 provided on the rear side of the vehicle body of the engine body 11 of the power unit 10 is guided in the vehicle body width direction. 11 can be prevented in advance.
[0029]
Furthermore, according to this power unit support structure, the mounting stay 17 is formed in a C shape when viewed from above, and the function of connecting the power unit 10 as the mount member and the vehicle body side, and the brake master cylinder 30 as the guide portion 17a. And a function for preventing interference between the engine body 11 and the engine body 11 are integrated with each other, so that the functional portion as the mounting member and the functional portion as the guide portion are separately provided in the engine room. The efficiency of the layout can be improved.
[0030]
In addition, although the power unit support structure in this invention was demonstrated taking the above-mentioned embodiment as an example, this invention is not limited to this, and various embodiments can be adopted without departing from the gist of the present invention. it can.
[0031]
For example, in the above-described embodiment, the case where the engine mount MT1 having a substantially trapezoidal shape is used as the mount member for supporting the power unit 10, but the present invention is not limited to this, and the power unit and the vehicle body are the main points. If it is an engine mount provided between the side frames, various other shapes can be widely applied.
[0032]
In the above-described embodiment, the engine mount bracket 16 disposed on the front side member 13R on the right side of the vehicle body is connected to the lower portion 16a connected to the engine body 11, the engine mount MT1, and the mounting stay 17. However, the present invention is not limited to this.
[Brief description of the drawings]
FIG. 1 is a top view showing a schematic configuration of a power unit support structure of the present invention.
2 is an enlarged perspective view showing a power unit support structure in FIG. 1; FIG.
3 is a top view for explaining the behavior of the power unit when a load is applied from the front of the vehicle body in the power unit support structure of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Power unit 11 ... Engine main body 12 ... Transmission 13 ... Main frame (frame)
14 ... Subframe (frame)
16 ... Engine mount bracket
16a ... Lower part
16b ... Upper part 17 ... Mounting stay 17a ... Guide part 30 ... Brake master cylinder MT1, MT2 ... Engine mount (mounting member)

Claims (2)

In a power unit support structure for supporting a power unit arranged laterally with respect to the longitudinal direction of the vehicle body on a frame on the vehicle body side via a mount member coupled to an engine body included in the power unit,
An engine mount bracket,
A mounting stay straddling over the side of the power unit from the vehicle body front side to the rear side,
With
The mount member is coupled to the engine body via the engine mount bracket and the mounting stay,
The engine mount bracket has a lower part connected to the engine body, and an upper part connected to the mount member and the mounting stay.
The mounting stay has a guide portion that guides a brake master cylinder provided at the rear of the power unit in the vehicle body width direction when a load is applied from the front of the vehicle and the power unit moves backward toward the rear of the vehicle.
A power unit support structure, wherein the mounting stay and the vehicle body front side and rear side of the engine body are coupled. The mounting stay is C-shaped when viewed from above.
The function of the mount member and the function of the guide part are integrated.
The power unit support structure according to claim 1 .

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