JP2001080369A - Installing structure for mount insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the height of a body side bracket by the length of an extension part so as to improve rigidity of the body side bracket by supporting the extension part protruding from an outer cylinder of a mount insulator to the body side bracket side by means of a pair of support plates in the body side bracket. SOLUTION: In a mount insulator arranged in the rear part of a power plant in an automobile, a pair of extension parts 12A, 12B are protruded from the outer circumferential face of an outer cylinder 12 fixed to a sub rear cross member 6R via a body side bracket 11 toward the body side bracket 11. The body side bracket 11 is formed by connecting a pair of opposed support plates 11A, 11B parallel to the body longitudinal direction together at their rear ends via a joint plate 11C. Both of the extension parts 12A, 12B are supported by both of the support plates 11A, 11B. In this way, the height of one supporting part 18 in the body side bracket 11 is lowered by the extension length of the both extension parts 12A, 12B, so that the rigidity of the supporting part 18 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a mount insulator for supporting a power plant of an automobile on a vehicle body, and more particularly to a mounting structure of a mount insulator for supporting a rear portion of a power plant.

[0002]

2. Description of the Related Art Conventionally, as a related art of a mounting structure of a mount insulator, there is a power plant supporting structure for an automobile disclosed in Japanese Patent No. 2802404. The power plant support structure includes a pair of left and right side members extending in the front-rear direction of the vehicle body, a front cross member connecting front ends of the side members, and a rear cross member connecting rear ends of the side members. A power plant including an engine and a transmission is supported by a so-called four-point cross with respect to a frame as a frame member.

In this power plant support structure,
A steering rack extending in the vehicle width direction near the upper part of the cross member, a mount member for supporting the power plant near the upper part of the steering rack, and a plate-shaped body and legs, the body being a mount member And a bracket that is fixed to the rear cross member and has a leg straddling the steering rack. That is, a bracket to which a mount member provided at the rear of the power plant is fixed is attached to the rear cross member so as to straddle the steering rack with its legs.

[0004] The steering rack provided on the upper surface of the rear cross member has an area for allowing rearward displacement so as to be movable rearward on the upper surface of the rear cross member. The leg portion including the region where the rearward displacement is allowed is erected on the rear cross member so as to straddle the steering rack.

By the way, in supporting such a four-point cross type power plant, in order to achieve objects such as improvement of collision safety, reduction of transmission gear noise, and reduction of engine roll input during idling, the power plant is required. It is desired to dispose the mount member on the principal axis of inertia in the roll direction (roll principal axis of inertia: hereinafter, simply referred to as the principal axis of inertia). Here, the principal axis of inertia is an axis such that when a rigid body is rotated around a certain axis, no moment is generated to change the direction of the rotation axis when viewed from a coordinate system that rotates with the rigid body. Good, unique to power plants. Specifically, the main axis of inertia of the power plant is determined by the weight distribution of the engine block and the transmission that constitute the power plant. When viewed from the front of the vehicle body, the inertia main shaft is approximated by a straight line descending from the engine side to the transmission side. Therefore, the mounting position on the transmission side is arranged at a position lower than the engine side.

In this case, one of the mounts on the left and right sides of the vehicle body (the transmission side) must be mounted on the sub front side member disposed below the front side member. Accordingly, it is necessary to dispose the mount member at the rear of the power plant on the sub cross frame (sub rear cross member) that connects the rear ends of the sub front side members. As a vehicle body front structure including a sub-frame including such a sub-front side member and a sub-cross frame,
A frame structure as disclosed in JP-A-10-45022 is known. In addition, there is a type in which a bracket on the member side straddling the steering rack is fixed to the suspension member, and a reinforcing collar is arranged in the suspension member to increase the rigidity of the bracket fixing portion.

[0007]

In the above-described power plant support structure, the bracket is set to have a long dimension in the vertical direction for convenience of straddling the steering rack with legs. For this reason, the bracket requires more strength, and it has been difficult to form the bracket with a lightweight material such as aluminum or resin. Further, when the bracket has a structure that straddles the steering rack, there is a problem that the number of components increases.

Further, in the prior art in which the collar is arranged in the suspension member to secure the rigidity, increase in the number of parts, man-hours at the time of manufacturing, and cost are inevitable. Specifically, in a structure in which the collar is inserted into the suspension member, the collar cannot be welded to the suspension member, so parts such as bolts and nuts for fixing the collar are required, and the number of parts, manufacturing man-hours, and cost Was increasing.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mounting insulator mounting structure which can reduce the weight, secure the mounting rigidity, and does not increase the number of steps and cost during manufacturing.

[0010]

According to the first aspect of the present invention,
A mounting insulator mounting structure interposed between a vehicle body-side bracket provided on a frame member and a plant-side bracket provided on a rear side in a vehicle longitudinal direction of a power plant including a prime mover, the vehicle body comprising: The side bracket has a pair of opposing support plates rising upward from the skeletal member and parallel to the vehicle longitudinal direction, and a connecting plate connecting the pair of support plates and parallel to the vehicle width direction, The mount insulator includes an inner cylinder supported by the plant-side bracket, an outer cylinder having an extended portion extending in the vehicle-body-side bracket direction, and an elastic body interposed between the outer cylinder and the inner cylinder. The extension of the outer cylinder,
The vehicle body-side bracket is supported by the pair of support plates.

According to the first aspect of the present invention, since the extension projecting from the outer cylinder of the mount insulator toward the bracket on the vehicle body side is supported by a pair of support plates of the bracket on the vehicle body side, the extension portion is provided. , The height of the vehicle body-side bracket can be reduced. This allows
The rigidity of the vehicle body side bracket can be increased. Here, the extension portion projecting from the outer cylinder can be set to have a longer thickness dimension up to the length dimension of the outer cylinder, so that the strength can be increased.

According to a second aspect of the present invention, there is provided the mounting structure for the mount insulator according to the first aspect, wherein the extension portion is held between the pair of support plates and the outer cylinder and the outer cylinder. It is characterized in that the inner cylinder is supported by bolts penetrating in a direction parallel to the rotation center axis direction of the inner cylinder.

Therefore, in the invention according to claim 2, in addition to the effect of the invention according to claim 1, the extension protruding from the outer cylinder is sandwiched between the pair of support plates, and the extension clamped between the support plates. The outer cylinder is firmly held by the vehicle body-side bracket by supporting the portion with a bolt penetrating in the direction of the rotation center axis of the outer cylinder and the inner cylinder.

Further, the invention described in claim 3 is the invention according to claim 1.
3. The mounting structure of the mount insulator according to claim 2, wherein the pair of support plates have two pairs of support portions facing each other in a longitudinal direction of the vehicle body, and the two pairs of support plates are provided. 4. One of the pair of support portions extends upward from the other pair of support portions, and the outer cylinder is formed with two of the extension portions respectively corresponding to the two pairs of support portions, The pair of support portions and the extension portion corresponding to each other are supported.

According to the third aspect of the present invention, in addition to the functions of the first and second aspects, two extending portions formed on the outer cylinder are respectively provided on the vehicle body side bracket. It is supported by a pair of opposing support portions of the support plate. Since one of the two support portions extends above the other of the support portions, the height of the other support portion can be reduced. As a result, the rigidity of the other support portion is significantly increased, and the rigidity of the vehicle body side bracket as a whole can be increased. For this reason, when the support portion and the extension portion projecting from the outer cylinder are connected, the strength of holding the outer cylinder to the vehicle body-side bracket can be increased.

According to a fourth aspect of the present invention, there is provided the mounting structure of the mount insulator according to any one of the first to third aspects, wherein the outer cylinder is formed by extrusion molding of a lightweight metal. It is characterized by having.

Therefore, in the invention of claim 4, in addition to the effects of the invention of claims 1 to 3, the outer cylinder is formed by extruding a lightweight metal such as aluminum, for example. The length of the extension can be the same as the length of the outer cylinder, and the strength of the extension can be increased. By supporting such an extension on the support plate of the vehicle body-side bracket, the rigidity of the mount insulator can be ensured, and the weight can be reduced.

Further, the invention according to claim 5 is the same as the invention according to claim 3.
5. The mounting structure of the mount insulator according to claim 4, wherein the frame member is a sub-cross member of a sub-frame disposed below a main frame that supports a body, and the support plate supports the support plate. 6. A notch is formed between the portions toward the sub-cross member side, and an arrangement gap for a steering rack is formed by the two extended portions and the notch.

According to the fifth aspect of the present invention, the notch formed between the support portions of the support plate is provided with two notches.
A gap for disposing the steering rack can be formed between the two extension portions and the outer cylinder disposed at a position away from the vehicle body side bracket. Therefore, the steering rack can be disposed on the sub cross member without being interfered by the vehicle body side bracket.

[0020]

According to the first aspect of the present invention, the power plant is extended by supporting, on the outer cylinder of the mount insulator, the extension projecting in the direction of the vehicle body bracket on the pair of support plates of the vehicle body bracket. Since the distance between the vehicle body side bracket and the power plant can be increased in the portion, the height of the vehicle body side bracket can be reduced accordingly. This has the effect of increasing the rigidity of the vehicle body side bracket.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the extension protruding from the outer cylinder is sandwiched between the pair of support plates, and the extension clamped between the support plates. Since the portion is supported by bolts penetrating in the direction of the rotation center axis of the outer cylinder and the inner cylinder, there is an effect that the outer cylinder can be firmly held on the vehicle body side bracket.

According to the third aspect of the present invention, in addition to the effects of the first and second aspects of the present invention, one of the two pairs of supporting portions is replaced with the other pair of supporting portions. By extending further upward, the height of the other support portion can be suppressed lower, and the rigidity of the other support portion is greatly increased, which has the effect of increasing the rigidity of the vehicle body side bracket as a whole. Therefore, according to the third aspect of the invention, there is an effect of increasing the strength of holding the outer cylinder to the vehicle body-side bracket.

According to the fourth aspect of the invention, in addition to the effects of the first to third aspects, the outer cylinder is formed by extruding a lightweight metal such as aluminum, for example. The length of the extension can be the same as the length of the outer cylinder, and the strength of the extension can be increased.
By supporting such an extension on the support plate of the vehicle body-side bracket, the rigidity of the outer cylinder of the mount insulator can be ensured, and the weight can be reduced.

According to the fifth aspect of the invention, in addition to the effects of the third and fourth aspects, the notch formed between the support portions of the support plate and the two extension portions are provided. A gap for disposing the steering rack can be formed between the outer cylinder and the outer cylinder arranged at a position distant from the vehicle body side bracket, so that the steering rack is interfered with the vehicle body side bracket on the sub cross member. There is an effect that it can be arranged without any.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the mounting structure of a mount insulator according to the present invention will be described below based on an embodiment shown in the drawings. Prior to the description of the mounting structure of the mount insulator, the outline of the support structure of the power plant will be described.

FIG. 1 is a plan view showing a state in which a power plant is supported on a skeletal member of a vehicle body using the mounting structure of the mount insulator of the present embodiment, and FIG. 2 is a partial cross-sectional view of the power plant supporting structure as viewed from the front. is there.

In the figure, reference numeral 1 denotes an engine 2 as a prime mover.
And a power plant in which the transmission 3 is integrally provided. The power plant 1 is supported by a frame 4 at the front of the vehicle body. The arrow FR indicates the forward direction of the vehicle. Hereinafter, the left-right direction refers to the vehicle width direction toward the front in the traveling direction.

As shown in FIG. 2, the frame 4 includes a main frame 5 and a sub-frame 6 disposed below the main frame 5 and connected to the main frame 5. The main frame 5 supports a body (not shown) including a front outer plate of the vehicle body and a partition plate for partitioning the inside of the main body into respective chambers. The subframe 6 supports a front wheel suspension (not shown).

The main frame 5 has a pair of left and right side members 5L, 5R extending in the front-rear direction of the vehicle body located on the left and right sides of the front part of the vehicle body, and a vehicle width for connecting the front ends of the side members 5L, 5R. A front cross member (not shown) extending in the direction of the vehicle and a dash cross member (not shown) extending in the vehicle width direction connecting the rear ends of the side members 5L and 5R.

The sub-frame 6 includes a pair of left and right sub-side members 6L and 6R which extend below the left and right side members 5L and 5R at the left and right sides of the front of the vehicle body and extend in the front-rear direction of the vehicle. The left and right sub side members 6L, 6R extend in the vehicle width direction and are integrally provided to connect the front ends of the left and right sub side members 6L, 6R. A sub-rear cross member 6RE is provided extending between the middle portions 6a in the front-rear direction.

In other words, the sub-frame 6 is formed to have a substantially similar planar shape to the main frame 5, and the sub-side members 6L and 6R are located below the side members 5L and 5R of the main frame 5, respectively.
The sub front cross member 6 </ b> F is disposed below the front cross member of the main frame 5 so as to face the front cross member.

Next, the positional relationship where the power plant 1 is arranged with respect to the frame 4 at the front portion of the vehicle body having such a configuration will be described. In the first embodiment, as shown in FIG. 1, a so-called four-point cross-shaped support is provided for the power plant 1 with respect to a frame 4 at the front of the vehicle body.

As shown in FIGS. 1 and 2, the power plant 1 is arranged such that the axial direction of the crankshaft (indicated by an arrow C) is substantially parallel to the vehicle width direction with respect to the frame 4 at the front of the vehicle body. Are located. As shown in FIGS. 1 and 2, left and right mount insulators MT1 and MT2 are arranged on the extension of the inertia main shaft TR in the power plant 1. Specifically, the left mount insulator MT1 is arranged along the main axis of inertia TR of the power plant 1,
It is supported by the sub-side member 6L. On the other hand, the right mount insulator MT2 is similarly supported by the side member 5R along the main axis of inertia TR of the power plant 1.

As shown in FIG. 1, a front portion of the power plant 1 is supported by a sub front cross member 6F via a mount insulator MT3. The rear part of the power plant 1 is supported by the sub-rear cross member 6RE via a mount insulator MT4.

Next, the mounting structure of the mount insulator MT4 of this embodiment will be described in detail.

As shown in FIGS. 1 and 3 to 6, the mount insulator MT4 provided at the rear of the power plant 1 is provided with extended portions 12A and 12B extending toward the bracket on the vehicle body side on the outer peripheral surface thereof. Outer cylinder 1 fixed to sub-rear cross member 6RE via side bracket 11
2 and both ends 13A coaxially inside the outer cylinder 12;
13A enters into the outside, and both ends 13A, 13A located outside thereof are attached to the plant side bracket 14.
An inner cylinder 13 supported on the power plant 1 side through
The support elastic body 1 interposed between the inner peripheral surface of the outer cylinder 12 and the outer peripheral surface of the inner cylinder 13 is fixed by, for example, vulcanization bonding.
And 5. The outer cylinder 12 and the inner cylinder 13
Are set in the same direction as the vehicle width direction.

As shown in FIG. 4, the vehicle body side bracket 11 includes a pair of opposed support plates 11 which are parallel to the vehicle longitudinal direction.
A, 11B and a connecting plate 11C formed along the vehicle width direction by connecting the rear end edges of the supporting plates 11A, 11B to each other.
Consists of At the front lower end of each of the support plates 11A, 11B, hanging pieces 16, 16 are formed that hang down along the front side of the sub-rear cross member 6RE, and at the rear lower end along the rear side of the sub-rear cross member 6RE. Hanging pieces 17, 17 are formed.

As shown in FIG. 4, the support plates 11A,
11B, a support portion 1 whose height from the upper surface of the sub-rear cross member 6RE is lower than a support portion 19 described later.
8 and 18 are formed. The support portion 18 has a bolt insertion hole 18A through which the bolt 20 is inserted. Further, as shown in FIG.
At the rear, the height of the sub-rear cross member 6RE from the upper surface is higher than that of the above-described support portion 18.
Are formed. The support portion 19 has a bolt insertion hole 19A through which the bolt 20 is inserted. Then, as shown in FIG. 3 and FIG.
A notch 21 is formed in a portion between the support portions 18 and 19 in FIG. B so as to be curved downward. The vehicle body side bracket 11 is welded to the sub rear cross member 6RE.

The outer cylinder 12 is formed by extruding aluminum. Extending portions 12A and 12B protruding from the outer cylinder 12 so as to form a predetermined angle (about 90 ° in the present embodiment) with each other are provided on the outer cylinder 12.
Has the same thickness dimension as the length of the main body. The distance between the support plates 11A and 11B is set to be substantially the same as the thickness of the extension portions 12A and 12B.
Further, a bolt insertion hole 22 that penetrates in the thickness direction (vehicle width direction) is formed at the distal end portion of each of the extension portions 12A and 12B.

As shown in FIG. 3, in the mount insulator MT4 having such a structure, the notches 21 and 21 of the vehicle body side bracket 11 and the extension 12 of the outer cylinder 12 are provided.
A rack storage space 28 in which the steering rack 24 is stored is formed between A and 12B. On the upper surface of the sub-rear cross member 6RE, rack brackets 25 each having a bolt insertion hole 25A are provided at positions sandwiching the vehicle body-side bracket 11. At the lower portion on both sides of the steering rack 24, mounting portions 26 each having a bolt insertion hole 26A are provided. The mounting portion 26 is mounted on the rack bracket 25 with bolts 27.

In this embodiment having such a configuration,
The extension parts 12A and 12B protruding toward the vehicle body side bracket 11 are supported by the pair of support plates 11A and 11B of the vehicle body side bracket 11 on the outer cylinder 12 of the mount insulator MT4.
One supporting portion 1 of the vehicle body side bracket 11 for the extension of B
8, it is possible to reduce the height. For this reason, the rigidity of one of the support portions 18 of the vehicle body-side bracket 11 can be greatly increased. Also, the vehicle body side bracket 11
The rear edges of the supporting plates 11A and 11B are connected to a connecting plate 11C.
, The rigidity of the supporting portions 19, 19 having a relatively high height is increased. For this reason, the outer cylinder 12 can be firmly supported on the vehicle body side bracket 11. The extension portion 12 is formed by a pair of support plates 11A and 11B.
The body-side bracket 11 that supports A, 12B is formed of a plate-like body, so it is difficult to obtain rigidity as compared with the extension parts 12A, 12B. However, since the outer cylinder 12 is formed by extruding aluminum, it is extended. The thickness of the portions 12A and 12B is the same as the length of the outer cylinder 12, and is formed with high strength.

In this embodiment, the extension portions 12A, 1
The outer cylinder 12 can be firmly held on the vehicle body side bracket 11 by the 2B being sandwiched between the pair of support plates 11A and 11B and supported by the bolts 20 penetrating in the vehicle width direction.

Further, in this embodiment, two pairs of support portions 1 are provided.
8, 18/19, 19, a pair of support portions 19 on the rear side,
Since the front portion 19 is formed higher than the pair of front support portions 18, the rack storage space 28 for storing the steering rack 24 can be secured even if the height of the front support portions 18 is set low. Can be.

Further, as shown in FIG.
The extension 12A of the outer cylinder 12 and the support plate 11A of the vehicle body-side bracket 11 are formed symmetrically with respect to a line L connecting the bolts 20 and 20 through which the extension 11B is inserted, and the extension 12B and the support plate 11B are symmetrical. Since the shape is formed so that the center O of the steering rack 24 is on the line L, the balance in strength of the mount MT4 is improved, and the rigidity of the vehicle body side bracket 11 can be sufficiently ensured. it can.

That is, when the extension portions 12A and 12B are set to the same length (in the above-described embodiment, the extension portion 12A on the rear side of the vehicle is set longer than the front side), the extension portion 12B on the front side of the vehicle comes first. If the distance between the bolts 20 is the same, the extension 1
Bending occurs in the support plate 11A to which 2A is connected. When the distance between the bolts 20 is increased,
Since the support plate 11A needs to be lengthened, the support plate 11A is similarly bent.

Although the embodiments have been described above, the present invention is not limited to these, and various modifications accompanying the gist of the configuration are possible. For example, in each of the embodiments described above, the engine mounts MT1 to MT4 have a four-point support structure, but the present invention can be applied to a three-point support structure and other support structures.

In the above embodiment, the engine 2 and the transmission 3 constituting the power plant 1 are arranged so as to be arranged in the vehicle width direction. However, the engine 2 and the transmission 3 are arranged so as to be arranged in the vehicle longitudinal direction. The present invention can be applied to the case.

Further, in the above-described embodiment, the outer cylinder 12 of the mount insulator MT4 is formed of aluminum. However, since the outer cylinder 12 has structural strength, it can be formed of another lightweight metal or synthetic resin. Yes, a lighter mount insulator is also possible.

In the above embodiment, the mount insulator MT4 is arranged on the sub-rear cross member 6RE.
And a rack storage space 28 for storing the steering rack 24 is not formed between the power plant 1 and the power plant 1.

Further, in the above-described embodiment, the mount insulators MT1 and MT2 are arranged on the extension of the principal axis of inertia, but the present invention is not limited to this.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a power plant support structure to which a mount insulator mounting structure according to the present invention is applied.

FIG. 2 is an explanatory front view of a support structure of the power plant of the embodiment.

FIG. 3 is a perspective view showing a mount insulator MT4 of the embodiment.

FIG. 4 is an exploded perspective view showing the mount insulator MT4 of the embodiment.

FIG. 5 is a perspective view showing a state where a steering rack is attached to the mount insulator MT4 of the embodiment.

FIG. 6 is a side view showing a state where a steering rack is attached to the mount insulator MT4 of the embodiment.

[Explanation of symbols]

MT1, MT2, MT3, MT4 Mount insulator 1 Power plant 2 Engine (motor) 3 Transmission 4 Frame 5 Main frame 6 Subframe 6L, 6R Sub side member 6R Sub rear cross member 11 Body side bracket 11A, 11B Support plate 11C Connection plate DESCRIPTION OF SYMBOLS 12 Outer cylinder 12A, 12B Extension part 13 Inner cylinder 14 Plant side bracket 15 Support elastic body 18, 19 Support part 20 Bolt 21 Notch 22 Bolt insertion hole 24 Steering rack

Claims (5)

[Claims] 1. A mounting insulator mounting structure interposed between a vehicle body-side bracket provided on a skeleton member and a plant-side bracket provided on a rear side in a vehicle longitudinal direction of a power plant including a prime mover. The vehicle body-side bracket has a pair of opposing support plates parallel to the vehicle body front-rear direction, and a connection plate connecting the pair of support plates and parallel to the vehicle width direction. An inner cylinder supported by the plant-side bracket, an outer cylinder having an extension extending in the vehicle-body-side bracket direction, and an elastic body interposed between the outer cylinder and the inner cylinder; A mounting insulator mounting structure, wherein an extension of the outer cylinder is supported by the pair of support plates of the vehicle body-side bracket. 2. The mounting structure for a mount insulator according to claim 1, wherein the extension portion is sandwiched between the pair of support plates.
A mounting structure for a mount insulator, wherein the mounting structure is supported by a bolt penetrating in a direction parallel to a rotation center axis direction of the outer cylinder and the inner cylinder. 3. The mounting structure for a mount insulator according to claim 1, wherein the pair of support plates includes two pairs of support portions that face each other and are paired along the vehicle longitudinal direction. One of the two pairs of support portions extends upward from the other pair of support portions, and the outer cylinder has two corresponding to the two pairs of support portions, respectively.
A mounting structure for a mount insulator, wherein two extension portions are formed, and the pair of support portions and the extension portions corresponding to each other are supported. 4. The mounting structure for a mount insulator according to claim 1, wherein the outer cylinder is formed by extrusion molding of a lightweight metal. Mounting structure. 5. The mounting structure for a mount insulator according to claim 3, wherein the frame member is a sub-cross member of a sub-frame disposed below a main frame that supports the body. A notch is formed between the support portions of the support plate toward the sub cross member, and an arrangement gap for a steering rack is formed by the two extension portions and the notch. A mounting structure for a mount insulator, characterized in that: