JP2004243872A - Power unit supporting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power unit supporting structure having increased mount rigidity of a power unit to a vehicle body to significantly improve the sound and vibration performance when accelerating a vehicle. <P>SOLUTION: The power unit structure supports the power unit 10 placed laterally with respect to the vehicle body to frames 13 and 14 at the vehicle side via mounting members MT1 and MT2. The mounting member MT1 has a mounting stay 17 extending from the vehicle front side to the rear side of the power unit 10, in contact with the side of the power unit 10. The mounting stay 17 is connected to the vehicle front side and the rear side of the power unit 19. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power unit support structure particularly suitable for a front engine / front drive type automobile (FF type vehicle).
[0002]
[Prior art]
Conventionally, in a vehicle such as such a vehicle, in which a power unit including an engine body and a transmission is mounted in an engine room in a lateral direction with respect to the longitudinal direction of the vehicle body, an anti-vibration support system for the power unit is used as an engine mount, which is a mounting member. A so-called cruciform mounting method or the like that supports the power unit at four points by disposing the power unit on a frame on the vehicle body side has been widely adopted.
[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 provided between the front ends 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 provided between front ends of these sub-frames, and a sub-rear cross member provided between rear ends of these sub-frames It is common to have the following.
[0004]
In this cross mounting method, for example, both sides of the power unit are supported by a front side member via an engine mount, and the front and rear portions of the lower side of the power unit are connected to the main front cross at the center of the engine room. This is a structure in which a center cross member provided between the member and the sub rear cross member is supported via an engine mount.
[0005]
However, in such a structure, the engine swinging at the time of idling may cause vertical vibrations in the engine mounts provided at the front and rear of the lower part of the power unit, which is disadvantageous in sound vibration performance. Was.
[0006]
For this reason, in recent years, as an anti-vibration support method for the power unit, an engine mount is arranged above the center of gravity of the engine on both sides of the power unit. A pendulum mount system is adopted in which an engine mount is disposed below the center of gravity of the engine in the front-rear direction of the power unit to suppress swinging motion.
[0007]
For example, Patent Literature 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 by straddling a lower portion of the power unit on the vehicle body rear side and a sub-rear cross member. Is disclosed.
[0008]
[Patent Document 1]
JP-A-2002-362175 (FIGS. 7 and 8)
[0009]
[Problems to be solved by the invention]
However, this pendulum mount method has a structure in which the power unit is mounted at a higher position on both sides than the cross mount method, 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 reduced, that is, the mounting rigidity between the power unit and the vehicle body is reduced.
[0010]
Therefore, it is difficult to suppress the vibration in the front-rear direction of the vehicle body generated from the fixed point of the power unit with the torque rod provided at the lower rear portion of the power unit, and the sound vibration performance during acceleration of the vehicle may be reduced. .
[0011]
Accordingly, the present invention has been made in view of such a conventional problem, and provides a power unit support structure capable of increasing the mounting rigidity between a power unit and a vehicle body and significantly improving sound vibration performance during acceleration of the vehicle. The purpose is to:
[0012]
[Means for Solving the Problems]
According to the present invention, in a power unit support structure for supporting a power unit disposed laterally with respect to a vehicle front-rear direction on a frame on a vehicle body side via a mount member, the mount member extends from a vehicle body front side to a rear side of the power unit. A mounting stay is provided so as to extend over the side, and the mounting stay is coupled to the front and rear sides of the vehicle body of the power unit.
[0013]
【The invention's effect】
According to the present invention, by providing a mounting stay laid across the side from the vehicle body front side to the rear side of the power unit, and by connecting the mounting stay to the vehicle body front side and rear side of the power unit, The mounting stay that supports the power unit to the frame on the vehicle body side and the coupling rigidity with the power unit are improved, so that vibrations that occur in the front-rear direction of the vehicle body can be sufficiently suppressed in practice, so the mounting rigidity between the power unit and the vehicle body is increased. In addition, it is possible to provide a power unit support structure capable of significantly improving sound vibration performance when the vehicle is accelerated.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0015]
1 to 3 show one 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. 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 body 11 and a transmission 12 are integrally provided, and is disposed in an engine room at a front portion of the vehicle body in a lateral direction with respect to a vehicle front-rear direction.
[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 vehicle body, and a subframe 14 that is disposed below the main frame 13 and is coupled to the main frame 13.
[0018]
The main frame 13 connects a pair of front side members 13R and 13L extending in the front-rear direction on both sides of the vehicle body and front ends of the front side members 13R and 13L to connect in the vehicle width direction (vehicle right side, vehicle body left side). ), And a main rear cross member (not shown) extending between the rear ends of the front side members 13R and 13L and extending in the vehicle width direction.
[0019]
The sub-frame 14 is positioned below the front side members 13R and 13L and extends in the front-rear direction of the vehicle body, and connects a pair of left and right sub-side members 14R and 14L to each other and connects the front ends of the sub-side members 14R and 14L to each other. A sub-front cross member 14F extending in the direction (the right side of the vehicle and the left side of the vehicle) and a sub-rear cross member 14RE extending in the width direction of the vehicle by connecting rear ends of the sub-side members 14R and 14L.
[0020]
Then, left and right engine mounts MT1 and MT2, which are mount members, are disposed on the main frame 13, and a torque rod 15 is disposed at a lower portion on the rear side of the vehicle body in the power unit 10, and the power unit 10 is mounted by the engine mounts MT1, MT2 and the torque rod 15. Is supported.
[0021]
Specifically, as shown in FIG. 2, the right engine mount MT1 has, for example, a substantially trapezoidal shape, is disposed on the front side member 13R on the right side of the vehicle body, and is connected to the engine of the power unit 10 via the engine mount bracket 16 and the mounting stay 17. It is connected to 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 body 11 and an upper portion 16b connected to the engine mount MT1 and the mounting stay 17. The connection portion 19 connects the lower portion 16a to the engine body 11, the connection pin 20 connects the upper portion 16b to the engine mount MT1, and the connection pin 21 connects the upper portion 16b to the mounting stay 17. ing.
[0023]
The torque rod 15 is coupled to a lower portion of the power unit 10 on the rear side of the vehicle body of the engine body 11 (FIG. 1) via a rear engine mount bracket (not shown), and the engine body 11 and a sub-rear cross member 14RE (FIG. 1). ) Extends in the front-rear direction of the vehicle body and is connected to provide a roll rigidity with respect to a roll direction input of the power unit 10.
[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 body 11 of the power unit 10 via the side surface of the engine body 11. And on the rear side, they are connected via mounting brackets 22, 23 and connection pins 24, 25 and the like. Incidentally, reference numeral 26 in the figure indicates a connection pin for connecting the mounting bracket 23 provided on the rear side of the vehicle body of the power unit 10 to the engine main body 11.
[0025]
Further, in the case of this embodiment, the mounting stay 17 is provided with a guide portion 17a which is inclined rearward of the engine body 11 from the vehicle body width direction to the vehicle body center side.
[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 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 guided in the width direction and can be prevented from interfering with the engine body 11.
[0027]
As described above, according to the power unit support structure, the substantially trapezoidal engine mount MT1 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. The engine unit 11 of the power unit 10 is connected via a mounting stay 17 and an engine mount bracket 16 which are laid across the side surface of the engine body 11 from the front side to the rear side of the vehicle body of the power unit 11, so that the power unit The rigidity of connection between the power unit 10 and the mounting stay 17 that supports the power unit 10 on a frame on the vehicle body side (the front side member 13R on the right side of the vehicle body) is improved, so that vibration generated in the vehicle longitudinal direction can be sufficiently suppressed in practical use. 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 the power unit support structure, the mounting stay 17 is provided with the guide portion 17a which is inclined from the vehicle width direction to the vehicle center side on the vehicle body rear side of the engine body 11, so that the guide portion 17a is formed. 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 width direction of the vehicle body. 11 can be prevented from occurring.
[0029]
Further, according to this power unit support structure, the mounting stay 17 is formed in a C-shape in a top view, the function of connecting the power unit 10 as the mount member to the vehicle body, and the function of the brake master cylinder 30 as the guide portion 17a. And a function of preventing interference with the engine main body 11 are integrally provided, so that a functional part as a mount member and a functional part as a guide part are provided in the engine room as compared with a case where they are provided separately. It is possible to improve the efficiency of the layout in the inside.
[0030]
Although the power unit support structure according to the present invention has been described by taking the above-described embodiment as an example, the present 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, a case has been described in which the engine mount MT1 having a substantially trapezoidal shape is used as the mount member for supporting the power unit 10. However, the present invention is not limited to this. As long as the engine mount is provided between the frame and the side frame, various other shapes can be widely applied.
[0032]
Further, 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 main body 11, the engine mount MT1 and the mounting stay 17. Although the description has been made of the case where the upper portion 16b is constituted by the upper portion 16b, 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.
FIG. 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.
[Explanation of symbols]
Reference Signs List 10 power unit 11 engine body 12 transmission 13 main frame (frame)
14 ... sub-frame (frame)
17: mounting stay 17a: guide section 30: brake master cylinder MT1, MT2: engine mount (mount member)

Claims (3)

In a power unit support structure for supporting a power unit arranged laterally with respect to the vehicle front-rear direction to a frame on the vehicle body side via a mount member,
The mounting member includes a mounting stay laid across a side portion of the power unit from a vehicle front side to a rear side,
A power unit support structure, wherein the mounting stay is coupled to a front side and a rear side of the vehicle body of the power unit. The mounting stay is
2. The vehicle according to claim 1, further comprising a guide portion for guiding a brake master cylinder provided on the rear side of the vehicle body of the power unit in a width direction of the vehicle body when a load is applied from the front of the vehicle body and the power unit retreats rearward of the vehicle body. The described power unit support structure. The mounting stay has a C shape in a top view,
The power unit support structure according to claim 2, wherein the function of the mount member and the function of the guide portion are integrally provided.

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