JP3275160B2 - Vehicle power plant support 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 structure for supporting a vehicle power plant such as an engine or a transmission,
More specifically, the present invention relates to a support structure for a power plant for a vehicle that can exhibit a function of buffering an impact generated when a forward load (external force) acts on the vehicle.

[0002]

2. Description of the Related Art Conventionally, as an example of a support means for a power plant for a vehicle, a means described in Japanese Patent Application Laid-Open No. 1-186429 has been proposed. That is, as shown in FIGS. 6A and 6B of the present application, a bracket 1e is installed between a pair of left and right front frames 9, 9 and a power plant such as an engine is mounted on the bracket 1e. 6 is mounted. The front end 9 is connected to both ends of the bracket 1e using, for example, bolts 2a.
The connection by a is performed when the load F equal to or more than a predetermined value is
When 1 (external force) acts, as shown in FIG. 7, the connection is released. Therefore, when the load is applied to the front of the vehicle, the power can be released to the rear by the external force, and a cushioning effect can be obtained.

In the means described in the above publication, an inclined portion 90 having an inclined front frame 9 is provided behind the mounting position of the power plant 6. Therefore, when the power plant 6 moves rearward during the forward load operation of the vehicle, this power plant 6 is
Zero can guide downward.

[0004]

However, the above-mentioned conventional means comprises a bracket 1 for supporting the power plant 6.
Since the bracket 1e is detached from the front frames 9 and 9 when a forward load is applied to the vehicle by setting the coupling strength of the bolts 2a between the front frames 9 and 9 and the front frames 9 and 9 to a constant strength. It has been very difficult to set the bonding strength using the bolt 2a. That is, in order to properly support the power plant 6 which is heavy and emits vibration, the coupling strength in the vertical direction between the bracket 1e and the front frames 9, 9 must be increased. In order to exert the cushioning function when the front load acts, the joint strength in the longitudinal direction of the vehicle body must be reduced so that the bracket 1 is easily detached from the front frames 9 and 9.

Therefore, conventionally, it has not been easy to appropriately satisfy such a condition of the joint strength in the joint using the bolt 2a. Conventionally, for example, if the tightening torque of the bolt 2a is larger than a predetermined torque, it may be difficult to detach the bracket 1e from the front frame 9 under a desired load operating condition.

Further, in the above-mentioned conventional means, since the power plant 6 is guided downward by the inclined portions 90 of the front frames 9, 9, the inclined portions 90 must be provided on the front frames 9, 9. There is. Therefore, there has been a problem that the shape of the front frames 9 and 9 is restricted, and the arrangement of devices provided around the front frames 9 and 9 is greatly restricted.

Conventionally, unlike the above, for example, a buckling deformation portion is provided in a part of a bracket for supporting a power plant, so that the bracket is actively buckled and deformed when a forward load is applied to the vehicle. Means for retreating a power plant by using a power plant have also been proposed. However, such means only buckle and deform a part of the bracket, making it difficult to increase the retraction stroke of the power plant. Also, while securing the vertical strength for supporting the power plant, it is also possible to set the support strength in the vehicle front-rear direction to a desired small strength so that the power plant can be retracted during a forward load operation of the vehicle, After all it was difficult.

The present invention was conceived in view of such circumstances, and has a simple structure without causing any trouble in the support of the power plant, and facilitates setting of the strength of each part. An object of the present invention is to make it possible to perform a backward movement operation of the power plant when a forward load is applied to the vehicle by using a structure that can be performed at the same time.

[0009]

Means for Solving the Problems To solve the above problems, the present invention takes the following technical means.

The invention according to claim 1 of the present application is a vehicle power plant support structure in which a bracket is attached to a fixing member at a front portion of a vehicle body and the power plant is supported by the bracket. Brackets are disposed at regular intervals in the vehicle width direction and are attached to the fixing member of the vehicle body, and a central portion in the longitudinal direction of the bracket is higher than the both ends between these two ends. And a rising portion formed so as to rise, the power plant,
The bracket is disposed below the rising portion of the bracket, and is suspended and supported above the rising portion of the bracket.

According to a second aspect of the present invention, in the support structure for a power plant for a vehicle according to the first aspect, each of both ends of the bracket is bolted to a fixing member of a vehicle body. A plurality of bolt insertion holes are provided, and among these plurality of bolt insertion holes, a bolt insertion hole located on the front side of the vehicle body has an opening opening at the outer end surfaces of both ends of the bracket. It is characterized in that it is formed as a notch hole.

[0012]

According to the first aspect of the present invention, both ends of the bracket are attached to the fixed member of the vehicle body, whereas the power plant rises above the both ends of the bracket. The mounting point of the power plant with respect to the bracket is offset from the mounting point of the bracket with respect to the vehicle body. Therefore, when a forward load (external force) is applied to the vehicle, when the external force is input to the power plant, the external force can be used as a force for tilting the rising portion of the bracket to the rear, and the rising portion of the bracket moves rearward. The power plant can be moved backward by falling down. As a result, it is possible to exert a shock-absorbing effect when a forward load acts on the vehicle.

According to the means for moving the power plant backward by tilting the rising portion of the bracket backward as described above, both ends of the bracket may be securely fixed to the fixing member of the vehicle body. Therefore, unlike the conventional means, it is not necessary to adjust the coupling strength of the bolt for attaching the bracket to the vehicle body to a desired strength, and the bracket can be easily attached to the fixing member of the vehicle body. it can.

Further, since the bracket has a so-called gate shape or a mountain shape in which a rising portion is formed at the center thereof, the strength of the bracket in the longitudinal direction of the vehicle body is relatively small. Even when the rising portion of the bracket is formed so as to easily fall backward when the vehicle is subjected to a forward load, the strength in the vertical direction can be increased due to the characteristics of the shape of the bracket. Therefore, there is an effect that the design and manufacture of the bracket for enabling the buffering function to be exerted at the time of the forward load operation of the vehicle can be easily performed without causing any trouble in the support of the power plant at the normal time.

Further, in the power plant, since the rising portion of the bracket falls backward so as to rotate around the mounting points at both ends of the bracket as a center, and moves backward, the both ends of the bracket are fixed to the fixing member. If the offset amount (height dimensional difference) between the point and the mounting point of the power plant with respect to this bracket is increased, the retreating stroke of the power plant can be increased. Therefore, it is easy to increase the amount of backward movement of the power plant, and the buffer function can be improved.

In addition, even when the power plant has a large amount of backward movement, the power plant eventually has the same backward movement as rotating about the mounting points at both ends of the bracket. Will be performed. Therefore, there is also obtained an effect that the fear that the power plant moves rearward without restriction can be appropriately avoided or suppressed. Unlike the conventional method, it is not necessary to provide a slope on the body frame as a means to prevent unrestricted backward movement of the power plant.Therefore, there are no significant restrictions on the shape of the body frame and the arrangement of vehicle equipment. There is also an advantage that the reception can be eliminated.

Further, since the power plant is arranged and supported below the rising portion formed on the bracket, the power plant can be mounted by effectively utilizing the space space below the bracket, and Efficiency can be improved. Further, since the power plant is suspended and supported by the bracket, it is possible to appropriately support the power plant at a very small number of connection points, for example, at one support connection point of the power plant. . That is, when the power plant is mounted on the upper surface of the bracket, it is difficult to support the power plant at, for example, only one connection point. It is also possible to properly support the power plant at only the connection points. Therefore, there is also obtained an advantage that the structure for connecting the power plant to the bracket can be simplified.

According to the second aspect of the present invention, of the plurality of bolt insertion holes provided at both ends of the bracket for bolting, the bolt insertion hole located on the front side of the vehicle body is the one of the bracket. Since the bracket is formed as a notch hole opened on the outer side surface of both ends, when the entire bracket is pressed rearward when a front load is applied to the vehicle and a bending deformation occurs in the center portion of the bracket, the notch hole is formed. Both ends of the bracket can be rotated so that the bolts inserted into the bolt insertion holes are separated from the bolt insertion holes formed as. Therefore, by the rotation of both ends of the bracket, it is possible to increase the amount of bending deformation and the amount of backward movement of the central portion of the bracket, and to increase the amount of backward movement of the power plant. As a result, the buffer function can be further improved. Since the bolt insertion hole on the rear side of the vehicle body is not formed as a notch hole, it is possible to prevent or suppress a problem that the entire bracket is completely detached from a predetermined fixing member of the vehicle body.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below.
This will be specifically described with reference to the drawings.

FIG. 1 is a front sectional view showing an example of a support structure of a vehicle power plant to which the present invention is applied.
FIG. 2 is a side view of FIG. 1, and FIG. 3 is a bottom view of FIG. In these figures, the direction of arrow a1 is the front of the vehicle body, and the direction of arrow a2 is the vehicle width direction.

In FIG. 1, the support structure for a power plant for a vehicle is applied to a so-called semi-cab-over type vehicle, and a floor tunnel 3 formed at the center of the front portion of the vehicle body in the vehicle width direction. A bracket 1 whose front view is formed in a mountain shape is arranged and mounted inside the vehicle, and the bracket 1 supports a mission 6 as an example of a power plant.

The bracket 1 is formed, for example, by pressing a metal plate.
Ends 10, 10 for attaching the vehicle to a desired portion of the vehicle body
And a rising portion 11 formed between the two end portions 10, 10 so that the central portion in the longitudinal direction of the bracket 1 rises above the both end portions 10, 10.
And

As shown in FIG. 3, each of the two ends 10, 10 of the bracket 1 is provided with two bolt insertion holes 12, 12a for inserting the bolts 2, respectively. Of these, the bolt insertion hole 12a on the rear side of the vehicle body is formed in a through-hole shape like a general bolt insertion hole, whereas the bolt insertion hole 12 on the front side of the vehicle body is Outer surface 10 of each end 10
It is formed in the shape of a notch having an opening 13 opened on the side a. The opening 13 is for allowing the bolt 2 inserted in the bolt insertion hole 12 to be detachable from the bolt insertion hole 12 when a forward load (external force) of the vehicle is applied, as described later. is there. This bracket 1
As shown in FIG. 1, both end portions 10, 10 are bolted to reinforcements 40, 40 fixed to a floor panel 4 constituting a floor tunnel 3 by bolts 2, and are spaced at a predetermined interval in the vehicle width direction. Installed.

The rising portion 11 of the bracket 1
A pair of right and left upright portions 1 that stand up from the both end portions 10, 10.
1a, 11a, and a horizontal upper piece 11b interconnecting the upper ends of the pair of uprights 11a, 11a. In order to effectively use the space in the floor tunnel 3, it is preferable that the shape of the rising portion 11 match the tunnel shape of the floor tunnel 3 as much as possible. However, in the present invention, the specific shape of the rising portion 11 is not limited to this. For example, the entire shape of the bracket 1 may be formed in a gate shape by erecting the upright portions 11a, 11a along the vertical direction. Further, it is possible to eliminate the distinction between the upright portion 11a and the upper piece portion 11b, make the whole thereof a smooth curved shape, and form the entire rising portion 11 in an arch shape.

The rising portions 11a, 1 of the rising portion 11
A pair of left and right bracket pieces 5, 5 are fixedly attached to the upper part of 1a. These bracket pieces 5,5
Is for supporting the upper part of the mission 6.
More specifically, the shaft body 50 supported by the bracket pieces 5 and 5 is inserted through a mount rubber (rubber bush) 7 attached to the mission 6 so that the mission 6 is mounted on the rising portion 11 of the bracket 1. And is suspended and supported.

Also, in the bracket 1 shown in FIG.
As shown in the figure, a concave portion 14 is provided on the front side of the central portion in the longitudinal direction of the upper piece portion 11b, and the width W of the central portion of the upper piece portion 11b is smaller than the width W1 of the other portions. ing. This serves to facilitate the rearward bending deformation of the central portion of the rising portion 11 of the bracket 1 when the front load acts on the vehicle, as will be described later.

Next, the operation of the above-described vehicle power plant support structure will be described.

First, in the above-mentioned support structure, since the bracket 1 supporting the mission 6 is formed to be bent in a mountain shape having a rising portion 11 at the center thereof, the thickness of each part of the bracket 1 is reduced. Even when the overall weight is reduced, the strength in the vertical direction can be increased from the characteristics of the overall shape of the bracket 1. Therefore, stable support of the mission 6 is possible. Further, since the mission 6 is disposed below the rising portion 11 of the bracket 1 disposed in the tunnel portion 3, the mounting of the mission 6 by effectively utilizing the space in the tunnel portion 3 of the vehicle body. And space efficiency is improved. Further, the mission 6 is suspended and supported via an upper rubber bush 7. For example, the mission 6 can be fixed by using only one rubber bush 7. Therefore, the mounting and supporting structure of the mission 6 can be simplified, and the number of components required for mounting the mission 6 can be reduced.

Next, in the above support structure, when the load (external force) F is input to the mission 6 as shown in FIG.
Can be deformed so as to fall rearward by the external force F, and the mission 6 can be moved backward. Therefore, the external force F can be reduced by the retreat operation of the mission 6. In the bracket 1 which is entirely bent in a mountain shape, the strength in the longitudinal direction of the vehicle body can be set small while securing sufficient support strength in the vertical direction. Setting for deforming the rising portion 11 of the bracket 1 so as to fall backward by a constant input is easy.

The retreating operation of the mission 6 can be performed by rotating the rising portion 11 of the bracket 1 rearward around the fixed position of the both ends 10, 10 of the bracket 1 by the bolts 2. Therefore,
Height H from the fixed position of both ends 10, 10 of the bracket 1 to the point of attachment of the mission 6 to the bracket 1
By increasing (see FIG. 2), it is possible to increase the amount of backward movement of the mission 6. In particular, the upper piece 11 of the rising portion 11 of the bracket 1
A concave portion 14 is provided at the center of b, and as shown in FIG. 5, since the center of the rising portion 11 is easily deformed rearward, the mission 6 attached to the center is retracted. The movement amount can be further increased.

As shown in the figure, when the central portion of the bracket 1 is deformed so as to retreat, the both ends 10, 10 of the bracket 1 are accordingly moved.
The bracket 1 is rotated by being dragged by the center of the bracket 1 so as to detach the bolt 2 from the notched bolt insertion hole 12 provided in each of the brackets 0 or to relatively move the bolt 2 in the detaching direction. Therefore, due to the rotational displacement of both ends 10, 10 of the bracket 1, the bracket 1
The central portion of the transmission 6 can be deformed rearward, and the retreat amount of the mission 6 can be further increased. As a result, the reversing movement of the mission 6 can improve the buffer function.

On the other hand, both ends 10, 1 of the bracket 1
Reference numeral 0 indicates that the brackets 1 are fixed to the reinforcements 40, 40 by the bolts 2 inserted into the bolt insertion holes 12a on the rear side of the vehicle body, so that the entire bracket 1 does not come off the reinforcements 40, 40. It is prevented or suppressed as much as possible. As described with reference to FIG. 4, if the rising portion 11 rotates backward while the both ends 10, 10 of the bracket 1 are fixed at the predetermined positions, there is a certain limit to the retreat amount of the mission 6. Occurs. For this reason, the retreat of the mission 6 without restriction is also prevented or suppressed. As a result, it is not necessary to take special measures for preventing the unrestricted retreating operation of the mission 6, and the entire structure can be simplified.

In the above embodiment, the floor tunnel 3
Reinforcement 40 of floor panel 4 constituting
Although the case where the bracket 1 is attached to the first embodiment has been described as an example, the present invention is not limited to this. In the present invention, the bracket 1 does not have to be disposed in the floor tunnel 3. For example, the bracket 1 may be attached to front side members provided at two places on the left and right sides of the front part of the vehicle body. In short, it is only necessary that both ends 10, 10 of the bracket 1 be attached to the fixing member of the vehicle body so as to be arranged at a fixed interval in the vehicle width direction.

In the above embodiment, the mission 6 is described as an example of a power plant. However, a specific example of a power plant to be supported is not limited to this. Any device that can be a driving device of a vehicle can be a support target in the present invention.

In addition, in the present invention, the specific configuration of each part of the bracket and the specific suspension support structure of the power plant with respect to the bracket are not limited as in the above-described embodiment, and the specific configuration of each part is not limited. Can be variously changed in design.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an example of a support structure for a vehicle power plant according to the present invention.

FIG. 2 is a sectional view of a main part taken along line XX of FIG.

FIG. 3 is a bottom view of FIG. 1;

FIG. 4 is a side sectional view showing an operation state of the support structure of the vehicle power plant shown in FIG. 1 when a forward load is applied.

FIG. 5 is a bottom view of FIG. 4;

FIG. 6A is a side view of an essential part showing an example of a conventional support structure for a vehicle power plant, and FIG. 6B is a front view thereof.

7 is an essential part side view showing an operation state of the conventional vehicle power plant support structure shown in FIG. 6 when a forward load is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket 2 Bolt 6 Mission (power plant) 10, 10 Both ends (of bracket) 11 Rise (of bracket) 12, 12a Bolt insertion hole 40 Reinforcement (fixing member)

────────────────────────────────────────────────── (5) References JP-A-58-156417 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60K 5/00-5/12

Claims (2)

(57) [Claims] 1. A support structure for a power plant for a vehicle, wherein a bracket is attached to a fixing member at a front portion of a vehicle body, and the power plant is supported by the bracket, wherein the bracket has a predetermined interval in a vehicle width direction. And both end portions which are arranged at a distance from each other and are attached to the fixing member of the vehicle body, and a rising portion formed so that a longitudinal central portion of the bracket rises above the both end portions between the two end portions. And the power plant is disposed below the rising portion of the bracket, and is suspended and supported above the rising portion of the bracket,
Support structure for vehicle power plant. 2. A plurality of bolt insertion holes for fixing bolts to a fixing member of a vehicle body are provided at both ends of the bracket, and the vehicle body includes a plurality of bolt insertion holes out of the plurality of bolt insertion holes. The bolt insertion hole located on the front side is formed as a cutout hole that opens on the outer surface of the end of the bracket,
A support structure for a vehicle power plant according to claim 1.