JPH04328020A - Power unit mounting construction - Google Patents

Abstract

PURPOSE:To perform on a car body three-point suspension applied to a power unit whose power outputting part is mounted on a transfer device, while projecting sideways and, at the same time, suppress roll of said power unit. CONSTITUTION:An engine 2, a transmission 3, and a transfer device 4 are installed in the longitudinal direction of a car body, and, at the same time, a power unit 1 whose power outputting part 4a toward a front wheel differential device 5 is projected sideways is mounted to the transfer device 4 by supporting it at three points of the left, right sides of the engine 2 and the bottom of the transfer device 4 so as to load it on cross members 9, 10, and also the rear of the power unit 1 is supported on the cross member 10 with a roll preventive mount member 22 at a position opposite to the power outputting part 4a.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit mounting structure for mounting a power unit consisting of an engine, a transmission, and a transfer device on a vehicle body.

0002

2. Description of the Related Art A power unit in an automobile, which includes an engine, a transmission, etc., is usually supported on the vehicle body by a mounting member. In that case, a type of car (
The weight of the power unit of a so-called FR vehicle is almost balanced across the axis of the power unit, so
The position of the mount member is selected based on the axis. However, in the case of a four-wheel drive vehicle in which the power unit is equipped with a transfer device, the power take-off portion that transmits rotational force to the front differential protrudes from the side of the transfer device, and the transfer device is Since the left and right weights of the power unit are unbalanced in the equipment part of the device, if the mounting member is supported on the axis as described above, vibrations of the power unit due to engine drive will increase.

[0003] Therefore, for example, Utility Model Application No. 61-6122
Publication No. 5 discloses that a power unit including an engine, a transmission, and a transfer device is supported by the vehicle body at three points: the left and right sides of the engine, and the transfer device, and a rear mount member that supports the transfer device is supported from the side from the axis of the power unit. A technique has been disclosed in which the above-mentioned vibrations due to weight imbalance are absorbed by arranging it on the torque axis in the longitudinal direction while being offset toward the front.

0004

[Problems to be Solved by the Invention] However, when the rear part of the power unit equipped with the transfer device is supported on the torque axis as described above, the support position is far from the power unit axis, so sudden acceleration, sudden deceleration, In addition, when a car performs intense movements such as sharp turns, a moment is generated centered on the rear mount position, which may cause the power unit to roll, which may cause other causes such as vibration, worsening driving conditions. I will let you do it.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a mounting structure that can suppress the occurrence of rolls in a structure in which a power unit including a transfer device is supported at three points.

[0006]

[Means for Solving the Problem] That is, the invention according to claim 1 of the present invention (hereinafter referred to as the first invention) has an engine, a transmission, and a transfer device disposed in the longitudinal direction of a vehicle body, and the transfer device A power unit having a protruding power take-off portion for the differential device on the side thereof is supported at three points: the left and right sides of the engine and the bottom of the transfer device, and the support position of the transfer device is determined. The mount structure is offset from the axis of the power unit to the side of the protruding side of the power take-off part, and a mount member for preventing roll of the power unit is provided on the side of the support position of the transfer device. .

[0007] Furthermore, the invention according to claim 2 (hereinafter referred to as the second
The present invention is characterized in that a roll-preventing mount member is provided at a position opposite to the power extraction portion of the transfer device.

Furthermore, the invention according to claim 3 (hereinafter referred to as the second invention) is characterized in that the exhaust pipe led out from the engine is disposed on the side of the power extraction section of the transfer device.

[0009]

[Operation] According to the first aspect of the invention, since the power unit is supported on the vehicle body by the roll prevention mount member, the rear mount member is laterally offset from the axis of the power unit. Even if the power unit tends to roll around the rear mount member due to violent movements such as acceleration, the roll can be suppressed.

[0010] By the way, it is also conceivable that the above-mentioned roll-preventing mount member be placed on the side of the power extraction section of the transfer device. However, in this case, the silanization device is offset toward the power take-off section and supported by the rear mount member, so it is difficult to maintain a long distance between the rear mount member and the roll prevention mount member, and the movement of the power unit is prevented from rolling. It is necessary to suppress the amount of deformation of the mount member to a small extent, and it is necessary to take measures such as increasing the hardness of the mount rubber or using a structure in which a stopper restricts the deformation of the mount for preventing rolls. On the other hand, in the second invention, since the power unit is supported on the vehicle body by the roll prevention mount member at a position opposite to the power take-off part of the transfer device, the above-mentioned distance can be taken longer, and the above-mentioned countermeasure can be taken. It will no longer be necessary.

Furthermore, according to the third invention, since the exhaust pipe passes through the power unit at a position opposite to the roll prevention mount member, deterioration of the mount member due to exhaust heat can be prevented.

0012

Embodiments Next, embodiments of the present invention will be explained based on the drawings.

FIG. 1 shows the front structure of a four-wheel drive vehicle, in which a power unit 1 is composed of an engine 2, a transmission 3, and a transfer device 4. In that case,
The engine 2, the transmission 3, and the transfer device 4 are arranged in the longitudinal direction of the vehicle body, and the transfer device 4 is provided with a power take-off portion 4a that protrudes laterally. A front wheel differential device 5 is arranged below the side, and a propeller shaft 6 connects the front wheel differential device 5 and the power output portion 4a. Therefore, in the transfer device 4 portion of the power unit 1, the weight of the unit is unbalanced with respect to the axis X of the unit 1, and the power take-off portion 4a side is heavier. Although not shown, a propeller shaft extending to a rear wheel differential is connected to the rear end of the transfer device 4.

A pair of front and rear cross members 9, 10 are attached to the left and right side frames 7, 8, and the power unit 1 is supported on the vehicle body using these cross members 9, 10. In this case, support is provided at three points: the left and right side surfaces of the engine 2 and the bottom of the transfer device 4. That is, as shown in FIGS. 1 and 2, the first cross member 9, which is located on the front side of the power unit 1 and passes under the engine 2, has the engine 2 attached thereto.
mount member attachment seats 11 are formed upright on both sides sandwiching the mount member and near the connecting portions with the side frames 7 and 8,
Engine mount members 12, 12 are connected to the mounting seats 11, 11 with fasteners 13 such as bolts and nuts, and brackets 14, 14 fixed to the side surfaces of the engine 2 are connected to the engine mount members 12, 12. The power unit 1 is connected to the upper end thereof by a fastener 15 such as a bolt and nut, so that the front side of the power unit 1 is supported by the vehicle body by the engine mount members 12, 12 mentioned above.

Further, a rear mount member (rubber mount) 16 is provided on the second cross member 10 which is located on the rear side of the power unit 1 and passes under the transfer device 4. The bracket 17 connected to the outer cylinder 16a is connected to the cross member 10.
Fasteners 18 such as bolts and nuts are used to secure the inner cylinder (
A bracket 19 (not shown) is fixed to the bottom surface of the transfer device 4 with fasteners 20 such as bolts and nuts, thereby supporting the rear part of the power unit 1 on the vehicle body. In that case, at the rear of the power unit 1, as mentioned above, there is an imbalance in weight on the left and right sides of the power unit axis X.
The power take-off part 4a of the heavy transfer device 4
The transfer device 4 is supported by moving it to the side so that the left and right weights across the support portion are balanced. Therefore, as shown in FIG. 1, the torque roll axis Y is located directly above the rear mount member 16.

Furthermore, the exhaust pipe 21 coming out of the engine 2 is disposed toward the rear of the vehicle through the side of the power unit 1 on the side where the rear mount member 16 is biased, and the exhaust pipe 21 and A roll prevention mount member 22 is attached to the second cross member 10 on the opposite side, that is, on the power unit axis X side with respect to the torque roll axis Y, and the rear part of the power unit is supported by the mount member 22. In this case, in this embodiment, the anti-roll mount member 22 is the rear mount member 1 described above.
6, the mount rubber 22a is held between the outer cylinder 22b and the inner cylinder (not shown), and the bracket 23 connected to the outer cylinder 22b is attached to the second cylinder by means of welding or the like. A bracket 24 fixed to the cross member 10 and connected to the inner cylinder is fixed to the transfer device 4 with fasteners 25 such as bolts and nuts.

Furthermore, the power output portion 4a of the transfer device 4 and the front wheel differential device 5 are connected by a power plant frame 26 to increase rigidity.

In the above structure, the power unit 1 is located at two points at the front of the left and right sides of the engine, and at a rear point at the bottom of the transfer device.
It is supported by 3 points. Further, at the rear of the power unit, the rear mount member 16 is offset from the power unit axis X toward the power take-off portion 4a side in order to balance the weight. Therefore, when sudden acceleration, deceleration, etc. are performed, a rotational moment indicated by arrows a1 and a2 is generated around the axis X due to the change in the engine speed, and the portion supported by the rear mount member 16, that is, The power unit 1 tends to roll around the torque roll axis B. In addition, the above-mentioned roll tends to occur due to severe changes in vehicle body posture such as sudden turns. However, according to the structure of this embodiment, since the rear part of the power unit is supported by the roll prevention mount member 22, the force in the roll direction can be absorbed by the member 22, thereby suppressing roll occurrence.

By the way, in order to suppress the above-mentioned roll of the power unit 1, it is also conceivable to arrange the roll prevention mount member 22 on the power extraction portion 4a side of the transfer device 4, contrary to the structure of this embodiment. However, in this structure, since the rear mount member 16 is offset toward the power take-off portion 4a side as described above, it becomes difficult to maintain a long distance between the rear mount member 16 and the roll prevention mount member, and the power unit 1 It is necessary to suppress the movement of the roll prevention mount member with a small amount of deformation, and it becomes necessary to take measures such as increasing the hardness of the mount rubber or using a structure in which the stopper restricts the deformation of the roll prevention mount member. On the other hand, if the power unit 1 is supported by the roll prevention mount member 22 opposite to the power extraction portion 4a as in the present invention, the above-mentioned distance can be increased and the above-mentioned measures are not necessary. Furthermore, by lowering the hardness of the mount rubber 22a, it is possible to enhance the function of absorbing vibrations transmitted from the power unit 1 to the vehicle body, and to suppress the generation of vibration noise.

Further, since the roll prevention mount member 16 and the engine exhaust pipe 21 are arranged with the power unit 1 in between, engine exhaust heat is prevented from reaching the roll prevention mount member 22, and the mount rubber 22 is prevented from reaching the roll prevention mount member 22.
Deterioration of a is eliminated.

[0021]

As is clear from the above description, according to the first aspect of the present invention, since the power unit is supported on the vehicle body by the mount member for preventing roll, the rear mount member is moved laterally from the power unit axis. Since the power unit is offset from the rear mount member, even if the power unit tends to roll around the rear mount member due to violent movements such as sudden acceleration of the automobile, the roll can be suppressed.

Further, according to the second invention, since the rear part of the power unit is supported on the vehicle body by the roll prevention mount member at a position opposite to the side from which the transfer device protrudes, the mount member supporting the transfer device and the roll Since the distance from the roll prevention mount member can be increased, the hardness of the mount rubber used for the roll prevention mount member can be lowered, and the vibration absorption effect can be enhanced.

Furthermore, according to the third invention, since the exhaust pipe passes through the power unit in a position opposite to the roll prevention mount member, deterioration of the mount member due to exhaust heat can be prevented, and accurate roll prevention can be achieved over a long period of time. A suppressive effect can be expected.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the front part of a vehicle body according to an embodiment of the present invention.

FIG. 2 is an enlarged view taken along the line A-A in FIG. 1.

FIG. 3 is an enlarged view taken along line B-B in FIG. 1.

[Explanation of symbols]

1 Power unit 2 Engine 3 Transmission 4 Transfer device 4a Power extraction section 5 Front wheel differential device 12 Engine mount member 16
Rear mount member

Claims (3)

[Claims] Claim 1: A power unit in which an engine, a transmission, and a transfer device are arranged in the front-rear direction of a vehicle body, and a power output portion for a differential device is protruded from the side of the transfer device, is installed on both left and right sides of the engine. and a bottom of the transfer device, and the support position of the transfer device is offset from the axis of the power unit to the side on which the power take-off portion protrudes. . A power unit mount structure, characterized in that a mount member for preventing roll of the power unit is provided on the side of the support position of the transfer device. 2. A power unit in which an engine, a transmission, and a transfer device are arranged in the front-rear direction of the vehicle body, and a power output portion for the differential device is protruded from the side of the transfer device, is installed on both the left and right sides of the engine. and a bottom of the transfer device, and the support position of the transfer device is offset from the axis of the power unit to the side on which the power take-off portion protrudes. . A power unit mount structure, characterized in that a mount member for preventing roll of the power unit is provided on the side of the support position of the transfer device and at a position opposite to the power extraction portion. 3. A power unit in which an engine, a transmission, and a transfer device are arranged in the longitudinal direction of the vehicle body, and a power take-off portion for the differential device is protruded from the side of the transfer device, is installed on both the left and right sides of the engine. and a bottom of the transfer device, and the support position of the transfer device is offset from the axis of the power unit to the side on which the power take-off portion protrudes. , a mount member for preventing roll of the power unit is provided on the side of the support position of the transfer device and at a position opposite to the power take-off part, and an exhaust pipe led out from the engine is arranged on the side of the power take-off part. The power unit mount structure is characterized by: