JP3417811B2 - Power plant mounting 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 power plant mounting structure for properly mounting a power plant including an engine and a transmission on a front portion of a desired vehicle such as a passenger car.

[0002]

2. Description of the Related Art As is well known, a mount structure of this type of power plant is required to have a simple overall structure and to facilitate assembly work of the power plant. First, it is required that the power plant be securely fixed and held when the vehicle normally runs. On the other hand, in the case of a so-called front engine type vehicle, at the time of a frontal collision of the vehicle,
A function to reduce the impact force is also required. In addition, if the power plant largely moves to the rear of the vehicle due to the load input from the front of the vehicle, this power plant causes a situation in which the dash panel and the steering wheel move backward to the rear of the vehicle. Therefore, it is required to prevent such a situation as much as possible.

Therefore, in the prior art, for example, Japanese Patent Laid-Open No. 6-1 is used.
There is an engine mounting structure described in Japanese Patent No. 66379. In the engine mounting structure described in the publication, a predetermined deformation of the vehicle body frame at the time of a frontal collision of the vehicle causes a bolt for fixing the engine to be detached from the vehicle body frame, and the fixed state of the engine to the vehicle body frame is released. This is the structure.

[0004]

However, in the above-mentioned conventional mount structure, although the impact force can be moderated to some extent by releasing the fixed state of the engine at the time of a vehicle collision, the engine is positively operated. It cannot be lowered. Therefore, conventionally, even if the fixed state of the engine is released at the time of a frontal collision of the vehicle,
As a result of the engine still moving horizontally toward the rear of the vehicle, the dash panel and the steering wheel may be pushed by the engine and move backward greatly toward the rear of the vehicle.

Further, in the above-mentioned conventional mount structure, the fixed state of the engine is released only when the vehicle body frame undergoes a predetermined predicted deformation.
On the other hand, the body frame is not always deformed in a fixed pattern, and the deformation pattern of the body frame is different depending on the collision pattern of the vehicle. Therefore, in the past, depending on the collision condition of the vehicle, the body frame may not be deformed in advance and the fixed state of the engine may not be released. There was also a problem that it was inferior in certainty.

The present invention has been conceived under such circumstances, and it is intended to ensure that the power plant can be securely and properly fixed and supported during normal operation of the vehicle, and the power plant can be supported from the front side of the vehicle. When there is a load input, it is necessary to properly prevent other members and devices such as the steering wheel from retreating significantly toward the rear of the vehicle due to the movement of the power plant toward the rear of the vehicle. It is an issue.

[0007]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention takes the following technical means.

According to the present invention, a bracket is connected to a power plant arranged in a front portion of a vehicle, and the power plant is supported by a mount support portion of a vehicle body frame via the bracket. The mounting structure of the above, the bracket,
A hole is provided through which the shaft body is inserted so that the bracket is supported by the mount support part by a shaft body that is attached to the mount support part in a substantially horizontal shape. The portion is provided with a fragile portion facing the shaft body, and the vehicle front portion of the hole portion lowers the bracket when the fragile portion is destroyed and the bracket moves rearward of the vehicle. As described above, a guide surface is provided which is inclined forward and upward so as to be able to contact the shaft body.

In the present invention, the shaft body mounted in the mount support portion in a substantially horizontal shape is inserted into the hole portion of the bracket connected to the power plant, so that the bracket supports the mount support portion through the shaft body. The power plant is supported by the mount support through the bracket. In addition, since a weak portion facing the shaft is provided in the vehicle front portion on the periphery of the hole portion of the bracket, the power plant and the bracket are provided with a force that moves rearward of the vehicle in a normal state of the vehicle. Even if it occurs, the force is much smaller than the load generated at the time of a frontal collision of the vehicle.Therefore, by causing the fragile portion to function as a stopper that abuts against the shaft body, the shaft body is separated from the hole portion. This can be properly prevented.
Therefore, in the normal state of the vehicle, the bracket can be appropriately connected to the mount support portion of the vehicle body frame, and the power plant can be appropriately fixed and held.

On the other hand, when the vehicle has a frontal collision and a large load is applied to the power plant from the front side, the fragile portion of the bracket can be broken by the contact force with the shaft body. The fixed state of the power plant can be released. Therefore, the immobilization action of the power plant can alleviate the impact force at the time of a vehicle collision. Further, when the fragile portion is destroyed and the power plant or the bracket moves to the rear of the vehicle, the forwardly inclined guide surface provided on the bracket comes into contact with the shaft body, so that the bracket is positively moved. Is guided to descend. Along with this, the power plant can also be actively lowered. By actively lowering the power plant in this way, it is possible to make it difficult for the power plant to horizontally move to the rear of the vehicle, and
This is preferable in that it is possible to reduce the possibility that the power plant directly presses the devices and members located behind it and to prevent the members and devices such as the dash panel and steering wheel from moving backward toward the rear of the vehicle. Becomes

Further, as an important effect, in the present invention, unlike the conventional means in which the fixed state of the power plant is released by a predetermined deformation of the vehicle body frame, the power of the power plant is irrelevant regardless of the deformation pattern of the vehicle body frame. If the plant has a heavy load input moving to the rear of the vehicle,
Based on this, the fragile portion can be destroyed and the power plant can be actively lowered. Therefore, in the invention of the present application, it is possible to more reliably prevent the impact force from being mitigated at the time of a frontal collision of the vehicle, and the power plant from largely moving to the rear of the vehicle, as compared with the related art.

In a preferred embodiment of the present invention, the power plant is a combination of an engine and a transmission, and the engine and the transmission may be connected to each other by the bracket. .

According to this structure, the bracket connected to the power plant not only plays a role of supporting the power plant on the mount support portion, but also
The engine and the transmission constituting the power plant are also connected to each other, and the role of increasing the connection strength between the engine and the transmission is also fulfilled. That is, both the engine and the transmission have a large weight and it is necessary to rigidly connect them, but the bracket has a function that meets such a need, which is rational. Further, since the strength of the connection between the engine and the transmission can be increased by the bracket, there is an advantage that the number of bolted points between the engine and the transmission can be reduced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a plan view of an essential part showing an example of a mount structure of a power plant to which the present invention is applied. FIG. 2 is a side sectional view of FIG. FIG. 3 shows III- of FIG.
It is a III sectional view. FIG. 4 is a sectional view taken along the line IV-IV of FIG. FIG. 5 is an exploded perspective view of a main part of the mount structure of the power plant shown in FIG. 1. 1 and subsequent figures,
The arrow Fr indicates the front of the vehicle, the arrow Up indicates the upper side in the vehicle height direction, and the arrow W indicates the vehicle width direction.

As shown in FIGS. 1 and 2, the mount structure of the power plant of this embodiment has a body frame 1 having a hollow rectangular shape in plan view.
In addition, the power plant 2 is mounted. The power plant 2 has an engine 20 and a transmission 21 connected to each other.

The vehicle body frame 1 is a vehicle body frame called a sub-frame, and has a hollow cross-sectional shape in which an upper member 1a and a lower member 1b having flange portions 10, 10 respectively on both sides in the width direction are joined to each other. Have
The vehicle body frame 1 is assembled to a lower surface portion of a main vehicle body frame (not shown) which constitutes a front portion of the vehicle. Specifically, the front part of the vehicle is provided with a main body frame such as two side members located on both sides in the vehicle width direction and a cross member connecting the two side members to each other. However, the vehicle body frame 1 is rigidly connected to the lower surface of the main vehicle body frame with bolts or the like. The power plant 2 is attached to the body frame 1.
In addition, a front suspension that supports the front wheels and a gear box for steering the front wheels can also be installed.

A rear mount support portion 4 and a front mount support portion 4 are provided on the upper surface of the vehicle body frame 1.
a and a side mount support portion 4b are provided, and the power plant 2 is supported by the plurality of support portions. The rear portion of the power plant 2 is supported by the rear mount support portion 4 via a bracket 3, and the present invention is applied to this portion.

The front mount support section 4 is also provided.
a is a part for supporting the front part of the power plant 2, and the pair of bracket pieces 29, 29 mounted on the front part of the power plant 2 are mounted on the upper end part of the front mount support part 4a. It is fastened via a bolt 90 to a rubber bush (not shown) as a vibration isolator. The side mount support portion 4b is a portion that supports one side portion in the vehicle width direction of the power plant 2 via an insulator. Most of the weight of the power plant 2 is supported by the front mount support portion 4a and the rear mount support portion 4. Therefore, the supporting strength of the power plant at the side mount support portion 4b is considerably smaller than the supporting strength at the two support portions 4a, 4.

The rear mount support portion 4 has a structure in which a rubber bush 40 is held on an upper portion of a support member 44 which is provided upright on the rear upper surface of the vehicle body frame 1. As shown in FIG. 3, the rubber bush 40 has a rubber 43 as an elastic member interposed between an inner cylinder 41 and an outer cylinder 42 each formed in a metal cylindrical shape. .

The bracket 3 is made of, for example, aluminum die casting, and has one end portion arranged on the front side of the vehicle,
First side wall portion 3 for facing the rear surface portion of the engine 20
5a is provided. Further, a second side wall portion 35b and a third side wall portion 35c facing the outer surface portion of the transmission 21 are provided on one side portion of the bracket 3 in the vehicle width direction. Plural bolt insertion holes 39 are formed in the side wall portions 35a to 35c, and the bolts 91 inserted into the plural bolt insertion holes 39 are the engine 20.
The one end portion and the side surface portion of the bracket 3 are connected to the engine 20 and the transmission 21 by being screwed into the screw holes provided in the transmission 21 and the transmission 21, respectively. With this configuration,
Since the engine 20 and the transmission 21 are connected to each other via the bracket 3, the connection strength between the engine 20 and the transmission 21 can be increased.

As is well shown in FIG. 5, the bracket 3 has bifurcated opposed wall portions 30, 30 at the other end portion arranged on the rear side of the vehicle and spaced apart in the vehicle width direction. It is configured. A pair of notched portions 33, 33 having an upper surface opening shape are provided in the facing wall portions 30, 30. These notches 33, 33 are formed in such a shape that their bottoms extend toward the vehicle rear side by a certain dimension, and the vehicle rear end portions of these notches 33, 33 connect a predetermined bolt 5 in series. Hole 31 for insertion,
It is said to be 31. Therefore, each of these holes 31
Has a shape in which a part of the periphery of the vehicle front side is open.

At the vehicle front portion of the peripheral edge of each of the holes 31, 31, there are provided downwardly projecting fragile portions 32, 32. Each of these fragile portions 32 corresponds to each of the hole portions 3 described above.
Although it is formed so as to face the outer peripheral surface of the bolt 5 when the bolt 5 is inserted into the inside of the bolt 1, as will be described later,
Due to the frontal collision of the vehicle, the fragile portions 32 and the bolts 5
When the contact pressure with and becomes very large and exceeds a predetermined value, it is configured to break. Each fragile part 32
When the fragile portion 32 is hard to break due to its relatively large thickness and width, it is provided with a slit in the fragile portion 32. Set to break properly. Of course, each of the fragile portions 32 has sufficient strength so as not to be broken by the contact pressure with the bolt 5 which is generated in the normal time of the vehicle and which is not caused by the frontal collision of the vehicle.

Guide holes 34, 34 are formed at the vehicle front positions of the holes 31, 31 so as to be inclined forward and upward. As will be described later, these guide surfaces 34, 34 are portions that play a role of guiding the bracket 3 and the rear portion of the power plant 2 by abutting against the bolt 5, and the notch portion 33. ，
Face to face 33.

Above the holes 31, 31 of the bracket 3, there are provided a pair of step portions 38, 38 projecting inward from the inner side surfaces of the opposed wall portions 30, 30. These steps 38, 38 correspond to the bracket 3 described above.
Is a portion used to lock the rubber bush 40 of the rear mount support portion 4. That is, when mounting the power plant 2 on the vehicle body frame 1, after supporting the front portion of the bracket 3 on the front mount support portion 4a, the hole portion of the bracket 3 is supported on the rear mount support portion 4. In this case, as shown by an arrow N1 in FIG. 6, the stepped portions 38, 38 protruding from the inner side surfaces of the opposed wall portions 30, 30 by an appropriate dimension L are inserted into the inner cylinder of the rubber bush 40. The upper surface portions 41a, 41a at both ends in the longitudinal direction of 41 can be hooked. In this way, when the bracket 3 is fastened to the rubber bush 40 using the bolt 5, it is not necessary to support the rear portion of the power plant 2 by other means, which is convenient.

As shown in FIG. 3, the bracket 3 has a hole portion 3 formed in the opposing wall portions 30 thereof.
1, 31 and the inside of the inner cylinder 41 of the rubber bush 40, the bolt 5 is inserted in a series, so that the bolt 5
Is fastened to the rear mount support portion 4 by means of a nut 5a screwed onto the same. The upper surface of the bracket 3 is provided with screw holes 37, 37, etc. These screw holes 37, 37 are used for mounting other suitable vehicle body equipment etc. to be assembled to the front part of the vehicle. It can be used as appropriate.

Next, the operation of the mount structure of the power plant will be described.

First, in the above structure, the bracket 3 which is firmly connected to the power plant 2 is properly fixed to the rear mount support portion 4 by using the bolt 5 and the nut 5a. As well shown in FIG. 4, since the projecting fragile portion 32 having a predetermined strength is provided in the vehicle front portion of the hole 31 through which the bolt 5 is inserted, the bolt 5 is It is also possible to properly prevent a large displacement in the hole 31. Therefore, in the above structure, the power plant 2 can be fixedly held in a normal state of the vehicle.

On the other hand, when a large load F is input to the front portion of the vehicle due to a frontal collision of the vehicle, as shown in FIG. Is released, and the rear part of the power plant 2 is lowered. That is, when the load F is input, as shown in FIG.
Since a force for moving the bracket 3 and the bracket 3 to the rear of the vehicle with a large force is generated, the fragile portion 32 of the bracket 3 is broken by being sheared by a very large contact force with the bolt 5. Then, the fixed state of the bracket 3 in the rear mount support section 4 is released, and the impact force at the time of a vehicle collision is relieved.

Next, when the power plant 2 and the bracket 3 start moving toward the rear of the vehicle by releasing the fixed state, each guide surface 34 of the bracket 3 comes into contact with the outer peripheral surface of the bolt 5 as shown in FIG. It will be. However, since the guide surface 34 is inclined forward and upward, the bracket 3 is guided so as to be forcibly lowered by the contact guide action of the guide surface 34 and the bolt 5. Therefore, power plant 2
Similarly to the bracket 3, the vehicle does not move largely horizontally to the rear of the vehicle due to the load input, but actively descends. The lowering operation of the power plant 2 is performed centering on, for example, the connecting portion of the front mount support portion 4a. Further, the descending dimension of the rear portion of the power plant 2 can be at least substantially equal to or higher than the height dimension H of each of the guide surfaces 34. In this way, if the power plant 2 is actively lowered,
The horizontal movement of the power plant 2 to the rear of the vehicle is suppressed, and the dash panel located behind the power plant 2 is directly pushed to the rear of the vehicle, or the steering gear box is pushed to the rear of the vehicle so that This makes it possible to prevent the steering wheel from projecting to the rear of the vehicle.

FIG. 10 and FIG. 11 are cross-sectional views of essential parts showing another embodiment of the present invention.

In the structure shown in FIG. 10, the fragile portion 3 having a substantially arcuate cross section that completely closes one side portion of the hole 31 at the vehicle front portion of the hole 31 through which the bolt 5 of the bracket 3 is inserted.
2a is provided. The fragile portion 32a is attached to the bolt 5
It is made thin so that it will be destroyed when the contact force with and exceeds a certain value. In the configuration shown in FIG. 11, a pair of fragile portions 32b and 32b having a mountain-shaped or triangular-shaped cross-sectional shape are provided in the vehicle front portion of the hole 31 through which the bolt 5 is inserted so as to face each other vertically. These fragile parts 32b, 3
2b is also configured to be destroyed when the contact force with the bolt 5 exceeds a certain value. Thus, in the present invention,
The specific structure of the fragile portion can be formed into various structures, and the specific structure is not particularly limited.

In addition, the specific construction of each part of the mount structure of the power plant according to the present invention is not limited to the above embodiment, and various design changes are possible. The guide surface as referred to in the present invention is basically formed in an upwardly inclined shape so that when a predetermined bracket connected to the power plant can move rearward of the vehicle, the bracket can be positively guided downward. It suffices if it is sufficient, and its specific inclination angle and length dimension are not limited.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part showing an example of a mount structure of a power plant to which the present invention is applied.

FIG. 2 is a side sectional view of FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

5 is an exploded perspective view of a main part of the mount structure of the power plant shown in FIG.

FIG. 6 is an exploded cross-sectional view of a main part of the mount structure of the power plant shown in FIG.

7 is a side cross-sectional view showing a state in the case where a heavy load is input from the front of the vehicle in the mount structure of the power plant shown in FIG.

FIG. 8 is a cross-sectional view of essential parts showing a state in which a fragile portion is destroyed when a heavy load is input.

FIG. 9 is a cross-sectional view of essential parts showing a state in which the bracket is guided downward.

FIG. 10 is a cross-sectional view of essential parts showing another embodiment of the present invention.

FIG. 11 is a cross-sectional view of essential parts showing another embodiment of the present invention.

[Explanation of symbols]

1 body frame 2 power plant 3 brackets 4 Rear mount support section 5 bolt (shaft) 20 engine 21 Transmission 31 hole 32 fragile part 34 Guide surface

Front page continuation (72) Inventor Yohji Kakimoto 2-1-1 Taoyuan, Ikeda-shi, Osaka Daihatsu Kogyo Co., Ltd. (72) Haruo Fujita 2-1-1 Taoyuan, Ikeda, Osaka Daihatsu Kogyo Incorporated (72) Inventor Satoshi Mizoguchi 2-1-1 Taoyuan, Ikeda, Osaka Daihatsu Kogyo Co., Ltd. (56) Reference JP-A-49-126017 (JP, A) JP-A-4-372425 ( JP, A) JP-A-6-166379 (JP, A) Actually open 2-38221 (JP, U) Actually open 3-115521 (JP, U) Actually open 3-69723 (JP, U) (58 ) Fields surveyed (Int.Cl. ⁷ , DB name) B62D 21/00 B62D 21/15 F16F 15/08

Claims (2)

(57) [Claims] 1. A mount for a power plant, wherein a bracket is connected to a power plant arranged at a front portion of a vehicle, and the power plant is supported by a mount support portion of a vehicle body frame via the bracket. In the structure, the bracket is provided with a hole through which the shaft body is inserted so that the bracket is supported by the mount support portion by the shaft body that is attached to the mount support portion in a substantially horizontal shape. At the same time, a fragile portion facing the shaft is provided in the vehicle front portion on the periphery of the hole, and the vehicle fragile portion is destroyed in the vehicle front portion of the hole, and the bracket is attached. There is provided a guide surface that is inclined forward and upward so that it can contact the shaft body so as to lower the bracket when moving to the rear of the vehicle. And wherein the mount structure of the power plant. 2. The mounting structure for a power plant according to claim 1, wherein the power plant is a combination of an engine and a transmission, and the engine and the transmission are connected to each other by the bracket.