JP3361028B2 - Engine unit 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 mount structure for an automobile engine unit.

[0002]

2. Description of the Related Art As a vehicle body mounting structure for an automobile engine unit, a vehicle body mounting structure has been proposed in which the engine unit is moved relative to the vehicle body against an impact force from the front of the vehicle body. For example, Shokai 60-1388
JP-A No. 6-166379 discloses an engine mounting bolt hole of a mount member for supporting an engine unit, and discloses an engine mounting bolt hole of a center member. What is formed in an elongated hole is disclosed. Also, the actual development 62-12
Japanese Patent No. 2731 discloses an engine support bracket provided with a buckling deformation portion.

[Problems to be Solved by the Invention]

The conventional apparatus described in the above publication has a problem in that the alignment of the engine unit side and the engine mounting bolt hole is troublesome, and the workability of engine mounting is low.

On the other hand, as a mount structure which can improve the workability of the engine mount, there are conventional mount structures shown in FIGS. This is because a bracket 51 having a U-shape in a J-plane view is coupled to the rear portion of the engine unit 50, and an outer cylinder 54 of an elastic bush 53 is attached to a cross member 52 arranged in the vehicle width direction.
And the left and right support walls 51a of the bracket 51,
The inner cylinder 55 of the elastic bush 53 is arranged between 51b so that the axis of the inner cylinder 55 is substantially aligned with the bolt insertion holes 51c formed in the support walls 51a and 51b. It is configured to be inserted through 55 and to be tightened and fixed with a nut 56a.

When the engine unit 50 is mounted, the bolt insertion holes 51c of the support walls 51a and 51b are installed.
So that the inner cylinder 55 and the inner cylinder 55 can be easily aligned with each other.
A generally V-shaped positioning piece 57 that holds the end portion of the inner cylinder 55 is joined to the inner surfaces of the support walls 51a and 51b by welding.

However, in the conventional structure shown in FIG. 10 and FIG. 11, it is found that the movement of the engine unit 50 is restricted and, as a result, the shock absorbing action of the vehicle body frame against the shock from the front of the vehicle body may be hindered. did.

The present invention has been made in view of the above-mentioned conventional circumstances, and the positioning can be performed reliably and easily when the engine unit is mounted, and the movement of the engine against an impact from the front of the vehicle body is not hindered. It is intended to provide a mount structure for an engine unit.

[0008]

According to a first aspect of the present invention, an outer cylinder of an elastic bush formed by interposing an elastic body between the inner and outer cylinders is fixed to either one of an engine unit and a vehicle body frame, and the other is described above. In a mounting structure of an engine unit in which an inner cylinder is fixed via mounting bolts, a bracket having a pair of support walls in which bolt insertion holes are formed is provided on the other side, and a vehicle body of the engine unit is provided on an inner surface of each of the support walls. A positioning piece bent and formed in a substantially V shape is provided for positioning and sandwiching the inner cylinder of the elastic bush so that the axis of the elastic bushing is substantially coaxial with the bolt insertion hole at the time of mounting. One of the two sides of the positioning piece to which the impact force is applied in association with the backward movement of the engine unit. A non-welded action edges, only non-working side of the direction in which the impact force does not act is characterized in that welded to the support wall.

According to a second aspect of the present invention, in the first aspect, the bent portion of the positioning piece is offset toward the working side from a vertical line passing through the center of the inner cylinder, and the working side is substantially vertical. It is characterized by being formed in.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 7 are views for explaining a mounting structure of an engine unit according to an embodiment of the present invention, and FIGS. 1 to 3 are a plan view and a left side view showing a state in which an engine unit is mounted, respectively. , Front view, FIG. 4 is a rear view of the engine unit, FIG. 5 is a left side view of the elastic bush portion, FIG. 6 is a left side view of a bracket on which a positioning piece is disposed, and FIG. 7 is an exploded perspective view showing a mounted state. It is a figure.

In the figure, reference numeral 1 is a sub-frame on which an engine unit 2 is mounted. The sub-frame 1 is a sub-front cross member between the front ends of a pair of left and right sub-side frames 3 and 3 extending in the vehicle front-rear direction. 4, the sub-rear cross members 5 are bridged between the rear parts and joined together. Also, the sub side frames 3, 3
The cross member 6 having a box-shaped cross section extending in the vehicle width direction behind
Is provided.

Above the left and right sub-side frames 3 and 3, body side members 7 extending in the vehicle front-rear direction are provided.
7, the left and right sub-side frames 3, 3 and the cross member 6 are suspended and supported on each side member 7 with an elastic member 8 interposed.

Further, U-shaped reinforcements 9 and 9 opening downward are joined to the front end portions of the sub-side frames 3 and 3, and are formed by the reinforcement 9 and the sub-frame 3. The front wheel axle 10 from the front differential 19 is inserted through the opening. Mount brackets 11, 11 are joined to the upper wall of each of the reinforcements 9 so as to extend inwardly.

In the engine unit 2, a clutch housing 16 and a mission case 17 are sequentially connected to a rear end of a vertically installed engine 15 arranged with its crankshaft oriented in the front-rear direction of a vehicle body. The transfer case 18 for distribution to the rear wheels is connected. The front wheel drive shaft 18a from the transfer case 18 is connected to the front differential 19, and the rear wheel drive shaft (not shown) is connected to the rear differential.

Front brackets 20, 20 are fixed to the left and right side walls of the engine 15, and the front brackets 20 are bolted and fixed to the mount bracket 11 with an elastic member 21 interposed therebetween.

A rear bracket 22 is fixed to the lower surface of the transfer case 18. The rear bracket 22 is arranged so as to be displaced to the right from the center in the vehicle width direction when viewed from the front. The rear bracket 22 is substantially U-shaped in a plan view, and has a pair of support walls 22 on a fixed wall 22 a that is bolted to the transfer case 18.
It has a structure in which b and 22b are formed so as to project in parallel, and a bolt insertion hole 23 is formed in each of the support walls 22b.

An elastic bush 25 is arranged at a portion of the cross member 6 facing the rear bracket 22. In this elastic bush 25, an inner cylinder 27 having an axial length longer than that of the outer cylinder 26 is inserted into the shaft core of the outer cylinder 26, and a rubber member 28 is baked between the inner cylinder 27 and the outer cylinder 26 to intervene. It has a structured structure. A mounting bracket 29 is welded to the outer cylinder 26, and the mounting bracket 29 is fastened and fixed to the cross member 6 with a bolt 29a.

The inner cylinder 27 is clamped and fixed between the support walls 22b and 22b by a bolt 33 inserted into the bolt insertion hole 23. As a result, the engine unit 2
The subframe 1 and the cross member 6 have elastic members 21,
It is elastically supported via 21 and an elastic bush 25.

Further, each support wall 22b is formed with a notch 23a extending to the front of the vehicle body, following the bolt insertion hole 23, and the front end of the notch 23a is open. This allows the engine unit 2 to move rearward with respect to the impact force from the front of the vehicle body.

On the inner surface of each of the support walls 22b, 22b, a positioning piece 30 which is bent and formed in a substantially V shape is arranged with its opening facing downward. The positioning pieces 30 are for positioning and temporarily holding the inner cylinder 27 when the engine unit 2 is mounted on the cross member 6, and the positioning pieces 30 contact the inner cylinder 27. When this is done, the axial center of the inner cylinder 27 and the bolt insertion hole 23 are arranged so as to be substantially coaxial.

Here, the positioning piece 30 is composed of an action side 30b on which an impact force acts as the engine unit 2 moves rearward and a non-action side 30c on which the impact force does not act, and the bent portion 30a thereof has an inner portion. The vertical line A passing through the center of the cylinder 27 is offset to the front side of the vehicle body by a dimension B corresponding to approximately ½ of the diameter of the inner cylinder 27. The action side 30b on the front side of the vehicle body is substantially vertical, while the non-action side 30c on the rear side is inclined rearward and downward. Furthermore, the working side 30b is not welded to the support wall 22b, and only the non-working side 30c is welded to the support wall 22b. In addition, 31 shows a welding bead.

Next, the function and effect of this embodiment will be described. To mount the engine unit 2 on the vehicle body frame, the engine unit 2 is lowered from above so that the positioning pieces 30 of the rear bracket 22 are placed on both ends of the inner cylinder 27 of the elastic bush 25 (FIG. 7). reference). As a result, the bolt insertion hole 23 of each support wall 22b and the inner cylinder 27 are positioned coaxially with each other, and the engine unit 2 is temporarily held by the positioning piece 30. In this state, the bolt 33 is inserted to attach the inner cylinder 27 to the rear bracket 2
Fix to 2.

On the other hand, when an impact force from the front of the vehicle body is applied to the engine unit 2, the engine unit 2 moves rearward together with the rear bracket 22. Along with this rearward movement, an impact force acts on the action side 30b of the positioning piece 30, whereby the action piece 30b bends from the bent portion 30a, and in the engine unit 2, the rear bracket 22 of the engine unit 2 and the elastic cross-member 6 of the rear cross member 6 are bent. Then, it will move further rearward (see FIG. 6). As a result, it is possible to prevent the shock absorbing action of the vehicle body frame from being impaired by the engine unit, and it is possible to absorb the shock load.

According to this embodiment, the rear bracket 22
A notch 23a that allows the rearward movement of the engine unit 2 is formed following the bolt insertion hole 23 of
Working side 30b of positioning piece 30 to which impact force is applied at the time of collision
Since the non-welding side is welded and only the non-working side 30c is welded, the working side 30b is bent by the impact force, so that it is possible to prevent the positioning piece 30 from obstructing the rearward movement of the engine unit 2. In addition, the non-acting side 30 of the positioning piece 30
Since c is welded and fixed to the rear bracket 22, it is possible to secure sufficient strength for temporarily holding the engine unit 2.

Further, in this embodiment, the positioning piece 3 is used.
The bent portion 30a of 0 is offset from the vertical line A passing through the center of the inner cylinder 27 by the dimension B toward the working side 30b, and the working side 30b is formed substantially vertically. It is difficult to bend against the force from the lower side to the upper side that acts at the time of mounting the vehicle, while it is easily bent against the force to the front side of the vehicle body at the time of collision, and as a result, sufficient strength for holding the engine unit 2 is secured. It is possible and does not hinder the rearward movement of the engine in the event of a collision.

That is, as shown in FIG. 6, the arm length of the moment generated on the action side 30b by the force from the lower side is as small as M1, whereas the arm length of the moment by the forward force is as large as M2. Here, by forming the notch 34 in the vicinity of the bent portion 30a of the action side 30b, it is possible to adjust the bending strength of the action side 30b.

In the above embodiment, the rear bracket 22 is fixed to the engine unit 2 side and the elastic bush 25 is fixed to the cross member (vehicle body) 6 side. However, the present invention is not limited to this. is not. Figure 8,
FIG. 9 is a diagram for explaining a modification of each of the above-described embodiments, in which the same reference numerals as those in FIGS. 5 and 6 denote the same or corresponding portions.

In FIG. 8, the elastic bush 25 is fixed to the engine unit 2 side, and the cross member (vehicle body) 6 is provided.
The bracket 22 is fixed to the side and a notch portion 23a that allows the rearward movement of the engine unit 2 is formed in the support wall 22b of the bracket 22 toward the rear of the vehicle body.
The working side 30b of the positioning piece 30 is not welded, and only the non-working side 30c is welded. Also in this embodiment, the same effect as that of the above embodiment can be obtained.

In FIG. 9, the bracket 22 is fixed to the lower surface of the vehicle body frame 40, and the elastic bush 2 is attached to the bracket 22.
It has a structure in which the engine unit 2 is suspended and supported by way of 5. Also in this case, the notch 23a that allows the rearward movement of the engine unit 2 is formed in the support wall 23b toward the rear of the vehicle body, and the working side 30b of the positioning piece 30 is not welded and only the non-working side 30c is formed. By welding, the same effect as that of the above embodiment can be obtained. Further, contrary to the above structure, the elastic bush 25 may be fixed to the vehicle body frame 40 and the bracket 22 may be fixed to the engine unit 2. In this case, the cutout portion 23a of the bracket 22 is directed to the front of the vehicle body. It will be.

[0030]

As described above, according to the engine unit mounting structure of the first aspect of the present invention, the positioning wall is provided on the support wall of the bracket, and the bolt insertion hole is formed in the elongated hole shape that allows the rearward movement of the engine unit. A notch is formed on the side, and the working side where the impact force acts with the rearward movement of the engine unit of the positioning piece is non-welded, and only the non-working side is welded to the support wall. There is an effect that the mounting strength can be secured when performing positioning and temporary holding, and when the impact force acts on the engine unit from the front of the vehicle body, the action side is easily bent, so that it does not hinder the rearward movement of the engine unit. The shock absorbing action of the body frame is not hindered.

According to the second aspect of the present invention, since the bent portion of the positioning piece is offset toward the working side from the vertical line passing through the center of the inner cylinder, and the working side is formed substantially vertically, the force from above and below is applied. Has sufficient strength, and is easily bent when input from the front or the rear, the strength when holding the engine unit can be further improved, and the rear movement of the engine unit can be further improved in the event of a collision. There is an effect that can be easily done.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which an engine unit according to an embodiment of the present invention is mounted.

FIG. 2 is a side view showing a state where the engine unit is mounted.

FIG. 3 is a front view of the engine unit mounted state.

FIG. 4 is a rear view of the engine unit.

FIG. 5 is a side view of an elastic bush that supports the engine unit.

FIG. 6 is a cross-sectional view of the bracket on which the positioning piece of the above embodiment is arranged.

FIG. 7 is an exploded perspective view showing a mounted state of the bracket.

FIG. 8 is a diagram showing a modified example of the above embodiment.

FIG. 9 is a diagram showing another modification of the above embodiment.

FIG. 10 is a side view showing a mount structure in the course of establishment of the present invention.

FIG. 11 is a cross-sectional view showing a mount structure in the course of establishment of the present invention.

[Explanation of symbols]

1 Front frame (body frame) 2 engine units 22 bracket 22b support wall 23 Bolt insertion hole 23a Notch 25 elastic bush 26 Outer cylinder 27 Inner cylinder 30 Positioning piece 30a bent portion 30b Working edge 30c Inactive edge 31 welding A vertical line B offset

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-338445 (JP, A) JP-A-5-240283 (JP, A) JP-A-8-164754 (JP, A) 145621 (JP, U) Actual Kaihei 6-69471 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 5/00-5/12

Claims (2)

(57) [Claims] 1. An engine in which an outer cylinder of an elastic bush formed by interposing an elastic body between inner and outer cylinders is fixed to either the engine unit or the body frame, and the inner cylinder is fixed to the other through mounting bolts. In the mounting structure of the unit, a bracket having a pair of support walls in which bolt insertion holes are formed is provided on the other side, and the inner cylinder of the elastic bush is mounted on the inner surface of each support wall when the engine unit is mounted on the vehicle body. A positioning piece bent and formed in a substantially V shape for positioning and sandwiching so that the shaft center is substantially coaxial with the bolt insertion hole is provided, and the bolt insertion hole is used to move the engine unit rearward in response to a shock from the front of the vehicle body. It is formed in an allowable long hole shape, and one of the two sides of the positioning piece on which the impact force acts due to the backward movement of the engine unit is not welded, and the impact force is An engine unit mount structure, wherein only the non-acting side that does not work is welded to the support wall. 2. The structure according to claim 1, wherein the bent portion of the positioning piece is offset toward the working side from a vertical line passing through the center of the inner cylinder, and the working side is formed to be substantially vertical. Characteristic engine unit mounting structure.