JP3900797B2 - Power plant support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a power plant housed in an engine room of a vehicle.
[0002]
[Prior art]
In an automobile (vehicle), a power plant necessary for traveling is accommodated in an engine room formed at the front of the vehicle body.
[0003]
Since the power plant is a rotating structure configured by adding only the engine and the transmission, and further by adding a clutch, a torque converter, and the like to this combination, a supporting structure suitable for the characteristics is required for supporting the power plant.
[0004]
Therefore, in a horizontal power plant (a layout in which the whole is arranged in the vehicle width direction), two points on the front and rear parts of the power plant, specifically the front part of the engine facing one side in the vehicle width direction of the engine room, and others A support structure for supporting the weight of the power plant by supporting the rear part of the transmission facing the side to the side frame members forming the skeleton on both sides in the vehicle width direction of the engine room using the engine mount member and the transmission mount member; A roll of the power plant is supported on one side of the power unit that faces the rear by a cross member that constitutes the vehicle body, a center member member that passes through the lower side of the vehicle body, and the like. In combination with a supporting structure to be suppressed. The same applies to vertical power plants.
[0005]
By the way, in automobiles, members that can be buckled and deformed are generally used for the side frame members that form the skeleton of the engine room in front of the passenger compartment, and the area where the engine room is located is made a crushable zone. When an impact force of a predetermined value or more is applied to the vehicle body, the side frame member on the side of the vehicle body buckles and absorbs the impact energy.
[0006]
[Problems to be solved by the invention]
In automobiles, we want to improve the absorption performance of impact energy as much as possible to ensure safety. In particular, there is a desire to improve the absorption performance against an offset frontal collision on the passenger side.
[0007]
However, the transmission mount member (or engine mount member) that is usually on the passenger seat side (the vehicle width direction side portion) of the engine room that supports the weight of the power plant has a base portion formed on the mount member as a side frame. A support structure is adopted in which a cylindrical anti-vibration rubber at the tip of the arm that serves as a load support is coupled to a bracket installed on the transmission via a bolt. ing.
[0008]
For this reason, the impact energy applied from the front of the vehicle body is buckled and deformed at the front frame portion from the point where the transmission mount member is bolted, and the rear frame portion from this point is absorbed. , Buckling deformation hardly occurs and impact energy absorption performance is limited.
[0009]
Nevertheless, if the engine room has a much larger space than the power plant, high energy absorption can be achieved to mitigate offset frontal collisions, but power can be reduced especially for downsizing recently. In a narrow engine room slightly larger than the outer shape of the plant, it is difficult to absorb high impact energy as in an offset frontal collision.
[0010]
The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide a power plant support structure capable of improving impact energy absorption performance at the time of collision.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the power plant support structure according to claim 1 is disposed on the vehicle width direction side portion of the engine room at the front of the vehicle body, and the base portion of the mount member that supports the power plant on the vehicle body, A first through hole for fastening through which a bolt for bolting is inserted; a second through hole for extracting a bolt formed at a point communicating with the first through hole and adjacent to the first through hole; The guide wall is formed so as to obliquely shield the portion directly above the opening of the through hole, and when an impact load of a predetermined value or more is applied during a collision from the front of the vehicle body, the bolt that has been bolted is The bolt is slid from the first through hole to the second through hole and the bolt end is pushed by the guide wall so that the second through hole is pulled out.
[0012]
With this configuration, when the vehicle collides from the front direction, the bolt is removed from the second through hole while being implanted by the applied impact. Then, the support by the mount member is lost, and the power plant is dropped from the mount member. The power plant that has lost its support begins to rotate.
[0013]
Due to the dropping of the power plant, the vehicle body portion is deformed from the point where the mount member is supported to the rear vehicle body portion, and the impact energy is absorbed. Also, the impact energy is absorbed by the behavior of the rotating power plant, and high impact absorption performance is obtained.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in FIGS.
[0015]
FIG. 1 shows a plan view of a front part of a vehicle body of an automobile (vehicle), for example, in which 1a and 1b are a pair of side frame members 2a extending along the front-rear direction of the vehicle body S constituting the vehicle body S. , 2b are various cross member members that extend in the vehicle width direction and are provided so as to intersect between the side frame members 1a, 1b, and 3 is a dashboard that also extends in the vehicle width direction.
[0016]
The engine room 4 is formed in the front portion of the vehicle body S, that is, in a region (corresponding to a portion surrounded by diagonal lines) surrounded by a side frame portion from the foremost cross member member 2a to the dashboard 3 that partitions the cabin. It is.
[0017]
The engine room 4 houses a power plant 5 necessary for driving the automobile. The power plant 5 has a structure in which, for example, a transmission 7 (manual type, AT type, etc.) is connected to the output portion of the engine 6 as a unit, and the entire unit is housed in a posture facing in the vehicle width direction, that is, sideways. .
[0018]
The power plant 5 is supported by an engine mount member 8a and a transmission mount member 8b whose front and rear ends are disposed on both sides in the vehicle width direction of the engine room 4, and side portions facing the dashboard 3 of the power plant 5 are It is supported by the roll mount member 8 c and mounted on the engine room 5.
[0019]
Among these, a panel structure as shown in FIG. 2A is used for a mount member responsible for the weight of the power plant 5, for example, the transmission mount member 8b. Specifically, the transmission mount member 8b includes a flat mounting seat 10 (corresponding to a base portion) extending in the longitudinal direction of the vehicle body and a load support portion 11 attached to a base 10a on the upper surface of the mounting seat 10. ing. The mounting seat 10 is fixed on the upper surface of the transmission case 7a of the transmission 7 with bolts 12 with flanges screwed from four points before and after sandwiching the load support portion 11 (bolt fastening). In addition, the load supporting portion 11 is formed by attaching an outer cylinder 14 which is filled with a cylindrical anti-vibration rubber 13 (elastic member) on the upper surface of the pedestal 10a. This cylindrical anti-vibration rubber 13 is combined with a fork-end bracket 15 (a structure having a U-shaped portion at the tip) provided on the side frame member 1b adjacent to the transmission end. The cylindrical anti-vibration rubber 13 and the fork end portion 15a at the tip of the bracket 15 are coupled by a bolt 16 whose axial center faces in the front-rear direction of the vehicle body S, and the transmission 7 is elastically suspended from the vehicle body S. ing.
[0020]
Although the detailed structure of the engine mount member 8a is not shown, similarly, a panel structure in which a cylindrical anti-vibration rubber 21 (shown only in FIG. 1: a load supporting portion) and a mounting seat (not shown) are assembled. A thing (not shown) is used. The mounting seat of the engine mount member 8a is fixed to the end of the engine 6 with bolts as in the case of the mission mount member 8b, and the cylindrical vibration-proof rubber 26 is fixed to the side frame 1a near the engine. Therefore, the engine 6 is elastically suspended.
[0021]
The roll mount member 8c that suppresses the roll of the power plant 5 has a hole portion whose axial center faces in the horizontal direction at one end portion and a hole portion in the vertical direction where the shaft center intersects with the other end portion (none of which is shown). ) Is used. A cross member in which one end portion of the hook-like member is rotatably connected to, for example, a bracket 6 a installed on the side portion of the engine 6, and the other end is disposed near the vehicle body portion, for example, the power plant 5. It is pivotally connected to a bracket 6b provided on the member 2b (or a center member member passing through the lower side of the vehicle body S) and regulates the posture so that the power plant 5 is not displaced about the axis.
[0022]
Among the mount members 8a to 8c of the engine room 4, the present invention is applied to a mount member, for example, a transmission mount member 8b, located on the side in the vehicle width direction of the engine room 4 that supports the weight of the power plant 5. Specifically, as shown in FIGS. 2A and 2B, each bolt hole 17 of the mounting seat 10 to which the bolt 12 is assembled can absorb a large impact energy such as an offset frontal collision. Ingenuity is given. Since the structure of each bolt hole 17 is the same, only one structure is shown.
[0023]
The structure of the bolt hole 17 will be described with reference to FIGS. 2A and 2B. Reference numeral 18 denotes a fastening through hole (corresponding to the first through hole), and 19 denotes the front of the hole 18. It is a through hole for bolt extraction (corresponding to a second through hole) formed adjacently.
[0024]
The through-hole 18 is formed with a circular opening that is larger than the outer diameter of the screw shaft 12 a of the bolt 12 and smaller than the outer diameter of the flange 12 b at the head of the bolt 12. The bolt 12 is screwed into the screw hole formed in the transmission case 7a from the through hole 18 to fasten the mounting seat 10 of the transmission mount member 8b.
[0025]
The through hole 19 is formed as a circular opening larger than the through hole 18. This opening communicates with the adjacent through hole 18. Further, at the boundary between the through hole 18 and the through hole 19, as shown in FIGS. 5 (a) and 5 (b), a function 20 for adjusting the load of the bolt 12 coming out of the through hole 18 (regulation for regulating the coming out). Part) is formed. The function 20 uses the triangular shape formed at the boundary between the through-hole 18 and the through-hole 19 as it is, and is tightened depending on how much the removal width A of the function 20 is smaller than the outer diameter of the screw shaft 12a. In this structure, the load when the bolt 12 is pulled out from the through hole 18 can be changed. Then, by adjusting the pull-out load of the bolt 12 with the magnitude of the pull-out width A and applying an impact of a predetermined value or more from the front of the vehicle body, the bolt 12 slides on the mounting seat 10 from the through hole 18 toward the through hole 19. It is like that.
[0026]
A guide wall 22 that is inclined upward toward the rear of the vehicle body is formed immediately above the through hole 19. The guide wall 22 has a structure in which when the through hole 19 is formed by press working, a circular plate portion blocking the through hole 19 is cut and raised in an oblique direction with the front side of the vehicle body as a fulcrum. The plate portion blocks the portion directly above the through hole 19. The guide wall 22 is inclined while drawing an arc suitable for pressing the head of the bolt 12 reaching the through hole 19 from above. Here, the through hole 19 is formed to have an outer diameter (larger than the outer diameter of the flange 12b) from which the head 12c of the bolt 12 can come out, and the bolt 12 pressed by the guide wall 22 is used in the transmission case. 7a is structured so as to be detached from the through hole 19 while being implanted in 7a.
[0027]
This separation induces a dropout of the transmission 7 at the time of a collision in the front direction of the automobile so that impact energy applied from the front part of the vehicle body is absorbed.
[0028]
If this energy absorption performance is explained by taking as an example a front offset collision in which a particularly large impact energy is generated, it is assumed that, for example, one side (left side) of the front of the automobile collides with the barrier X shown in FIG.
[0029]
Then, as shown in FIG. 3, due to the impact applied from the front of the vehicle body, the foremost cross member member 2a bends and the side frame member 1b undergoes buckling deformation from the front end side.
[0030]
At this time, if the applied impact load exceeds the force (the force caused by the fastening force of the bolt 12 or the resistance force of the bolt 20) that fixes the mounting seat 10 of the transmission mount member 8b, the bolt 12 is removed from the transmission mount member 8b. break away.
[0031]
That is, as shown in FIGS. 4 and 5, each bolt 12 slides on the upper surface of the mounting seat 10 with a force pushing the transmission 7 from the side, passes from the through hole 18 to the through hole 20 to the through hole 19. Head. Here, the through hole 19 is formed in a size that allows the head 12c of the bolt 12 to be easily pulled out, and the guide wall 22 is formed immediately above the through hole 19, so that the head protruding from the mounting seat 10 is formed. The part 12c is pressed from the upper side as it reaches the through hole 19. Accordingly, the bolt 12 is forcibly dropped from the through hole 19 without being caught by the opening edge of the through hole 19. Thus, the bolt 12 is detached from the through hole 19 while being implanted in the mission case 7a.
[0032]
Then, the transmission 7 falls off below the vehicle body S. The power plant 5 that has lost its support begins to rotate backward as indicated by the arrow in FIG. 3 due to the applied impact.
[0033]
Due to the dropout of the transmission 7, the buckling deformation of the side frame 1b occurs sufficiently from the front end to the rear part (the part that has not been easily deformed due to the influence of the transmission) from the point where the transmission 7 is supported. Energy absorption is performed. At the same time, the impact energy is absorbed by the behavior of the power plant 5 rotated backward.
[0034]
Thereby, in addition to being able to earn a large amount of deformation in the crushable zone including the side frame member 1b, the amount of movement of the power plant 5 can also be earned.
[0035]
Therefore, although it is a simple structure in which the bolt 12 is detached from the transmission mount member 8b, the impact energy absorption performance at the time of collision can be remarkably enhanced by the synergistic effect of the above effects. In particular, the obtained energy absorption performance is effective for offset frontal collision in which large impact energy is generated.
[0036]
The present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention. In the above-described embodiment, the mount member that supports the mission is a mount member that is bolted to the mission case and whose load support portion is elastically supported by the side frame (vehicle body). The present invention may also be applied to a structure in which the base of the mount member is bolted to the side frame (vehicle body) and the load support portion of the mount member is elastically supported by the transmission case. Of course, the present invention is not applied only to the transmission mount member as in the embodiment, but may be applied only to the engine mount member or to both the engine mount member. Also, the bolt disengagement structure is not a structure in which two circular through holes are combined as in the embodiment, but may be a structure in which holes having other shapes are combined, for example, a key hole structure, and the guide wall is not cut and raised. The structure may also be formed.
[0037]
【The invention's effect】
As described above, according to the first aspect of the present invention, the power plant that suppresses deformation of the vehicle body can be dropped from the vehicle body at the time of collision, so that many deformations effective for absorbing impact energy can be obtained. You can earn the amount with the car body and the amount of power plant movement.
[0038]
Therefore, while having a simple structure in which the bolt is detached from the mount member, the impact energy absorption performance at the time of collision can be remarkably enhanced by the synergistic effect of the above effects.
[Brief description of the drawings]
FIG. 1 is a plan view of a front portion of a vehicle body showing a power plant support structure according to an embodiment of the present invention.
FIG. 2A is a perspective view showing details of the periphery of a transmission mount member at an M portion in FIG. 1;
FIG. 4B is an enlarged perspective view showing a bolt hole of the mount member.
FIG. 3 is a plan view for explaining the behavior of a power plant during an offset frontal collision.
FIG. 4 is a cross-sectional view for explaining the behavior of a bolt in a bolt hole at the time of the collision.
FIG. 5 is a perspective view of the same.
[Explanation of symbols]
1b ... side frame 4 ... engine room 5 ... power plant 6 ... engine 7 ... transmission 8b ... transmission mount member (mount member)
10 ... Mounting seat (base part)
DESCRIPTION OF SYMBOLS 11 ... Load support part 12 ... Bolt 17 ... Bolt hole 18 ... Through-hole for fastening (1st through-hole)
19: Bolt extraction hole (second hole)
22 ... guide wall S ... vehicle body.

Claims (1)

A mount member having a base portion and a load support portion is disposed on a vehicle width direction side portion of an engine room at a front portion of the vehicle body, and the base portion of the mount member includes a power plant including an engine and a transmission, and a vehicle body side. It is a power plant support structure that is bolted to one side and the load support is supported on the other side,
The base portion of the mount member is
A first through hole through which the bolt to be bolted is inserted;
A second through hole for bolt extraction formed at a point communicating with the first through hole and adjacent to the first through hole, and having an opening of a size capable of extracting a bolt end portion;
And a guide wall formed so as to obliquely shield the portion directly above the opening of the second through hole, and bolted when an impact load of a predetermined value or more is applied at the time of collision from the front of the vehicle body. A structure for supporting a power plant, wherein the bolt is slid from the first through hole to the second through hole, and the bolt end portion is pushed by the guide wall to be pulled out from the second through hole.

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