JP2748606B2 - Engine support device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a power plant support device that reduces noise and vibration.

(Prior Art) When a power plant, which is a combination of an engine and a transmission, is installed in an engine room of an automobile, the engine is usually fixed to the vehicle body at two locations on the right and left and one at the rear of the vehicle. -75323, Japanese Utility Model Application Laid-Open No. 63-133408, etc.). By the way, there is a situation that the length of the transmission attached to the engine body differs between the two-wheel drive vehicle and the four-wheel drive vehicle. That is, since the four-wheel drive vehicle has the protruding portion of the propeller shaft toward the rear wheel, the overall length is longer than that of the two-wheel drive vehicle.

(Problems to be Solved by the Invention) When the power plant for a four-wheel drive vehicle having such a long overall length is supported on the vehicle body by a support mechanism similar to that of a two-wheel drive vehicle, the propeller shaft portion swings. ,
Since the absorption is not completely performed by the supporting portion, vibration is likely to be generated, and noise is generated at the same time, so that there is a problem that comfort is impaired. An object of the present invention is to provide a power plant support device that solves this problem.

(Means for Solving the Problems) The present invention provides, as means for solving the above problems, a horizontally disposed engine body 5, a transmission 6 projecting rearward, and a projection 6 projecting from the transmission 6 in the engine room 2. In a support device for a power plant 3 of a four-wheel drive vehicle that is equipped with a power plant 3 having a rear wheel drive shaft and drives the front and rear wheels with the power plant 3,
The support of the power plant 3 on the vehicle body 1 includes a first support point A on the front left side of the power plant 3, a second support point B on the right side thereof, and a third support point substantially at the rear center of the power plant 3. C and four fourth support points D further behind the third support point C via torque bushes 8, 10, 12, and 14, respectively. The first and second support points A and B are The third and fourth support points C and D are located behind the axle center line OO, ahead of the axle center line OO connecting the front wheels in the vehicle plan view, and
The positions of the first and fourth support points A and D are set lower than the center of gravity CG of the power plant 3, and the second support point B is set above the center of gravity CG of the power plant 3 and the first support point. Placed in a substantially vertical transverse plane passing through point A;
The support point C is formed on the upper wall of the transmission 6 behind and below the center of gravity CG of the power plant 3.

(Operation) With such a configuration, the vehicle body 1 of the power plant 3
The main support of the power plant 3 is provided at three positions of first, second and fourth support points A, B and D on the left, right and rear of the power plant 3, and additionally provided above the rear of the power plant 3. The swing generated by the propeller shaft can be absorbed at the support portion (third support point) of the portion via the torque bush 14. Therefore, the support mechanism for reducing the vibration and the noise can be provided to the power plant 3 for the four-wheel drive vehicle basically by the same support mechanism as the two-wheel drive vehicle.

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a vehicle body, 2 denotes an engine room at a front portion of the vehicle body 1, and 3 denotes an engine room 2
The power plant 4 mounted inside is a vehicle compartment. First
As shown in FIG. 2, FIG. 2, and FIG. 4, the power plant 3 is configured by combining an engine body 5 placed horizontally and a transmission 6 projecting rearward. The power plant 3 is supported on the vehicle body 1 at the following four points.

That is, the power plant 3 has a first support point A supported by the front left bracket 7 and the torque bush 8,
The second support point B supported by the front right bracket 9 and the torque bush 10, and the vehicle body 1 via the bracket 13 and the torque bush 14 at substantially the upper center of the rear part of the power plant 3 (upper part of the transmission 6). Are supported by the vehicle body 1 at four points, that is, a third support point C supported by the vehicle and a fourth support point D further behind the third support point.

Then, as shown in FIG. 1, first and second support points A and B
Are located forward of the axle center line OO connecting the front wheels in a plan view of the vehicle, and the third and fourth support points C and D are located behind the axle center line OO. As shown in FIG. 2, the positions of the first and fourth support points A and D are lower than the center of gravity CG of the power plant 3, and the second support point B is located below the center of gravity CG of the power plant 3. It is located on the top and in a substantially vertical transverse plane passing through the first support point A. Further, the third support point C is formed on the upper wall portion of the transmission 6 behind and below the center of gravity CG of the power plant 3.

In FIG. 2, what is indicated by reference numeral 15 is a dashboard for partitioning the engine room 2 and the passenger compartment 4, and the above-mentioned third support point C is provided at a lower portion of the dashboard. As is apparent from the figure, the third support point C is farther away than the center of gravity CG of the power plant 3.

FIG. 3 shows details of the torque bush 12.
The torque bush 12 is formed by sandwiching a rubber member 18 having a V-shaped hole a at the center between two upper and lower plate members 16 and 17 so as to support the transmission 6 from below. Have been. By using the rubber material 18 only in the direction (downward) where the load (weight) acts, and pressing the rubber material 18 only in that direction when a load is applied, by using the rubber material 18 Unlike using a cylindrical mount provided with a rubber material, the mounting space can be reduced.

In the engine support device of the present invention having such a configuration, the load of the power plant 3 is supported at the first and second support points A and B and the fourth support point D. . The third reaction point C supports the torque reaction force when the vehicle suddenly starts and accelerates and decelerates. When acting in this manner, the fourth plant located at the rear of the power plant 3
Since the support point D of the power plant 3 is far away from the center of gravity CG of the power plant 3, the spring multiplier as an insulator (mount) can be set small, so that the vibration transmission from the dash panel 15 and the floor panel is cut off. And the ability to reduce vibration and noise levels while driving.

(Effects of the Invention) The present invention is a power plant support device configured as described above, and supports a power plant to a vehicle body by using a first support point on the front left side of the power plant and a first support point on the right side. 2 through a torque bush at four support points, a third support point substantially at the rear center of the power plant, and a fourth support point further rearward than the third support point.
The first and second support points are disposed forward of an axle center line connecting front wheels in a plan view of the vehicle, and the third and fourth support points are disposed rearward of the axle center line. The position of the support point 4 is located below the center of gravity CG of the power plant, and the second support point is located above the center of gravity CG of the power plant and in a substantially vertical transverse plane passing through the first support point. Further, since the third support point is formed on the upper wall portion of the transmission behind and below the center of gravity CG of the power plant, the third support point is a support device for a two-wheel drive vehicle. By adding the fourth support point D to the third support points A to C, the power plant for a four-wheel drive vehicle can be supported in a well-balanced manner. Further, since the torque reaction force can be reliably prevented, the drive feeling can be improved by the feeling of rocking of the power plant when the vehicle suddenly starts or accelerates or decelerates. Since vibrations from the dash panel and the floor panel can also be absorbed, vibration and noise levels can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of one embodiment of the present invention, FIG. 2 is a side view schematically showing a main part side surface of FIG. 1, and FIG. 3 is an example of a torque bush used in the present invention. FIG. 4 is a perspective view showing the disassembled state of FIG. 1 and FIG. 1 ... body 2 ... engine room 3 ... power plant 5 ... engine body 6 ... transmission 7,9,13 ... bracket 8,10,12,14 ... torque bush 11 ... mount member A ... First support point B Second support point C Third support point D Fourth support point

Claims (1)

(57) [Claims] 1. A power plant having a horizontally disposed engine body, a transmission projecting rearward, and a rear wheel drive shaft projecting from the transmission is mounted in an engine room, and front and rear wheels are driven by the power plant. In a support device for a power plant of a four-wheel drive vehicle,
The support of the power plant to the vehicle body includes a first support point on the front left side of the power plant, a second support point on the right side of the power plant,
A third support point substantially at the rear center of the power plant and the third support point;
The fourth and third support points are further provided via torque bushes at the fourth support point further rearward than the support point. The first and second support points are located in front of the axle center line connecting the front wheels in a plan view of the vehicle. , The fourth support point is located behind the axle center line,
The positions of the first and fourth support points are lower than the center of gravity of the power plant, and the second support point is above the center of gravity of the power plant and is substantially perpendicular to the first support point. An apparatus for supporting a power plant, wherein the apparatus is disposed in a transverse plane, and the third supporting point is formed at an upper wall portion of the transmission at a position rearward and below a center of gravity of the power plant.