JPH09240290A - Vibration damping device for power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accomplish reduction in weight and in a product cost. SOLUTION: A connecting part 36, which is integrally connected to an elastic body 34b of a mount insulator while being fixed on a mounting face of a bracket 38, is formed of a steel plate by means of press molding. The connecting part 36 is constructed of a connecting plate 36b, which is extended in the longitudinal direction of a vehicle and fixed in the mounting face of the bracket 38 via fastening bolts 44a2 , 40b, and a solid rod shaped connecting pin 36a, in which the base end part is fixed in a part of the connecting plate 36b while the tip part extended outward in the vehicle width direction is installed in a shaft center of the elastic body. In this way, reduction in weight of a vibration control device can be accomplished, while complicated secondary machining in the connecting part can be dispensed with, so that a cost per a device can be greatly lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator for a power unit, which is disposed between a power unit mounted on a vehicle and a member on the vehicle body side to reduce vibration transmission from the power unit to the member on the vehicle body side.

[0002]

2. Description of the Related Art As a power unit anti-vibration device, for example, the device described in the engine suspension device of Japanese Patent Laid-Open No. 3-182837 is known.

FIGS. 6 and 7 show the conventional power unit vibration isolator, in which a bracket 4 is fixed to a right end portion of an engine 2 mounted horizontally by a connecting bolt 4a and a vehicle body. A mount insulator 10 having an elastic body 8 mounted therein is fixed to an upper portion of the side member 6 by a connecting bolt 10a. Then, the bracket 4 and the mount insulator 10
Are connected by a connecting pin 12 and a connecting block 14 integrated at the base end side of the connecting pin 12.

[0004] That is, the connecting pin 12 is inserted into the inner cylindrical member 8a press-fitted into the axis of the mount rubber 8, and the nut 12a is screwed into a screw formed at the tip end thereof to be integrated with the mount rubber 8. It is connected to. The connection block 14 is formed of a cast member, and is screwed with a screw portion formed on the base end side of the connection pin 12 into a screw hole formed therein, thereby forming the connection pin 1.
2 and integrated. And this connecting block 14
On the lower surface thereof, connecting bolts 14a and 14b are arranged, and a bolt insertion hole 14c is formed.

The upper surface of the bracket 4 is brought into contact with the lower surface of the connecting block 14 by the upward movement of the engine 2, and the connecting bolts 14a and 14b are inserted into bolt insertion holes 4a formed in the bracket 4 to screw the nuts 16a. At the same time, the connection bolt 18 is inserted into the corresponding bolt insertion hole 14c and the bracket-side bolt insertion hole 4b, and is tightened with the nut 16b.
The mount insulator 10 and the bracket 4 are connected via the connector 4 and the connecting pin 12.

As a result, the mount rubber 8 absorbs the vibration of the engine 2 to improve the vibration isolation property for the vehicle body side member 6.

[0007]

By the way, since the connecting block 14 shown in FIG. 6 is formed by casting,
It is difficult to reduce the weight of the vibration isolator.

Further, in order to form the connecting block 14, it is necessary to carry out secondary processing such as shaving work after casting and forming a screw hole for fixing the base end side of the connecting pin 12. There is a problem in terms of product cost.

The present invention has been made by paying attention to the unsolved problem of the above-mentioned conventional example, and for a power unit which has the same function as that of the conventional device but can be reduced in weight and product cost. It is an object to provide a vibration isolation device.

[0010]

In order to achieve the above object, the invention according to claim 1 is a bracket fixed to an end portion in a vehicle width direction of a power unit mounted horizontally, and a vehicle for this bracket. A mount insulator fixed to a vehicle-body-side member located outside in the width direction and having an axial center of an elastic body mounted inside thereof oriented in the vehicle width direction, and an elastic body of the mount insulator while being fixed to a mounting surface of the bracket. In a vibration isolator for a power unit including a connecting portion integrally connected to the bracket, the connecting portion is formed by press molding using a steel plate as a material, and is attached to the mounting surface of the bracket while extending in the front-rear direction of the vehicle. A connecting plate fixed via a fastening bolt, a base end portion fixed to a part of the connecting plate, and a tip end portion extending outward in the vehicle width direction is made of the elastic material. A solid rod-shaped connecting pin attached to the shaft center of the connecting plate, and the connecting plate is fixed to the mounting surface via fastening bolts at at least three fixing positions in the front-rear direction of the vehicle. Further, the fixed positions are provided so as to be separated from each other.

According to the present invention, since the connecting plate is formed by press forming using a steel plate as the material, the weight is reduced as compared with the conventional device using the cast member, and the connecting plate and the connecting pin are fixed to each other. Since it is integrated with each other, complicated secondary processing work is unnecessary. Further, when a force in the front-rear direction of the vehicle is input to the mount insulator, a moment with the distance between the mount insulator and the connecting plate as the arm length acts on the fixed position of the connecting plate. Since at least three fastening bolts at fixed positions, which are provided apart from each other in the front-rear direction, share the moments, respectively,
The load on each fastening bolt is reduced.

According to a second aspect of the present invention, in the power unit vibration isolator according to the first aspect, the connecting plate is a pair of side walls that stand up while being separated from each other in the front-rear direction of the vehicle, and the upper edge portions of these side walls. A first lower plate portion that extends forward from the lower edge portion of the front side wall and a rearward portion that extends rearward from the lower edge portion of the rear side wall while having a step portion that includes an upper plate portion that extends between A second lower plate portion, and the at least three fixing positions are provided on the upper plate portion, the first lower plate portion, and the second lower plate portion, respectively.

According to the present invention, even when the force in the vertical direction of the vehicle is input to the mount insulator and the force acts as a twisting force on the connecting plate, the pair of side walls receives the twisting force. Prevents deformation of the connecting plate.

Further, the invention described in claim 3 is the invention according to claim 1.
Alternatively, in the vibration isolator for a power unit according to claim 2, a plate-shaped stopper that continuously rises from the edge portions of the first lower plate portion and the second lower plate portion on the mount insulator side. Formed integrally,
A non-metallic restricting member that restricts the movement of the connecting portion in the vehicle width direction by contact with the stopper is disposed at a position of the mount insulator facing the stopper.

According to the present invention, even when a force outwardly directed in the vehicle width direction is input to the mount insulator from the power unit through the bracket and the connecting portion, the elastic body is deformed rightward in the vehicle width direction. Since the stopper contacts the regulating member, contact with the mount insulator and the connecting portion is prevented.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vibration isolator for a power unit according to the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a front view showing the inside of the engine room of the vehicle, and FIG. 2 is a plan view showing the inside of the engine room. In these figures, a power unit 20 is composed of an engine 22 mounted horizontally (in the vehicle width direction) and a transmission 24 integrally connected to the left side of the engine 22 in the vehicle width direction. . The power unit 20 is supported by a vehicle body-side member via a plurality of vibration isolators connected to both ends in the vehicle width direction and front and rear positions of the vehicle.

In these drawings, a device indicated by reference numeral 26 is a vibration isolator arranged between the right end portion of the engine 22 in the vehicle width direction and the vehicle body side member (vehicle body side member) 33. The mount insulator 34 fixed to the upper portion of the vehicle body side member 33, the connecting portion 36 connected to the mount insulator 34 via the press-fitting pin (connecting pin) 36a, and the fixing portion fixed to the right end portion of the engine 22. It is composed of a connecting portion 36 and a unit side bracket (bracket) 38 fixed via bolts.

The mount insulator 34 is shown in FIG.
And 4, an outer cylinder member 34a in which a pair of flange portions 34a ₂ is formed continuously from the both edges of the rubber support portion 34a ₁ which is formed in a substantially U shape, the rubber support portion Mount rubber (elastic body) 34 having a plurality of currants 34b ₁ mounted by vulcanization adhesion inside 34a _1.
b, a mount rubber 34b, and an inner cylinder member 34c mounted at the axial center position. Then, the pair of flange portions 34a ₂ and the bolt insertion hole 34a _3, 34a ₄ are formed, these bolt insertion holes 34a _3, 34a
_The mount insulator 34 is fixed to the upper portion of the vehicle body side member 33 by screwing a bolt 40 (see FIG. 2) inserted from above into the screw hole into a screw hole formed in the vehicle body side member 33.

Here, as shown in FIG. 3, on the side surface of the mount insulator 34 facing the left side in the vehicle width direction, a substantially U-shaped restricting member 37 made of rubber or the like is provided on the end surface of the rubber supporting portion 34a ₁ . Also, they are joined while covering a part of the mount rubber 34b. The regulation member 37 is a member that prevents contact between the rubber support portion 34a ₁ and a connection plate 36b described later.

Further, the unit side bracket 38 is
As shown in FIGS. 1 and 2, a unit fixing portion 38a that is a substantially L-shaped member formed of a cast member and is fixed to the right end of the engine 22 via a bolt 50.
The unit fixing portion 38a is provided with a connecting portion pedestal 38b extending rightward in the vehicle width direction.

As shown in FIG. 3, the mounting surface formed on the upper surface of the connecting portion pedestal 38b is a flat surface 38b ₁ located at the right end in the vehicle width direction and extending in the vehicle front-rear direction.
And a projecting portion 38b ₂ which is formed so as to project to a substantially intermediate position in the vehicle front-rear direction at a position on the left side of the flat surface 38b _{1 in the} vehicle width direction and whose upper surface is flat. A bolt insertion hole 40a is formed on the front side of the flat surface 38b ₁ of the vehicle, and a stud bolt (fastening bolt) 40b protruding upward is fixed on the rear side of the flat surface 28b ₁ of the vehicle. There is. In addition, the protrusion 38
The b _2, screw holes 40c provided with the internal thread in the hole circumference is formed.

On the other hand, as shown in FIG. 3, the connecting portion 36 has a solid cylindrical press-fitting pin (connecting pin) 36a.
And a connecting plate 36b fixed to the connecting portion pedestal 38b of the unit side bracket 38 via a bolt by being integrated with the press-fitting pin 36a.

As shown in FIG. 4, the press-fitting pin 36a has a press-fitting portion 36a ₁ having an outer diameter larger than the inner diameter of the inner cylindrical member 34c formed on one end side in the longitudinal direction and a connecting plate on the other end side. A rod-shaped joint portion 36a _{2 for} joining with 36b
Are formed. In addition, the press-fitting portion 36a ₁ and the joining portion 3
6a of the boundary position is _2, ring-like flange portion 36a _3, which is set to have a larger diameter than the outer diameter of the joint portion 36a ₂ is formed.

The connecting plate 36b is formed by press forming using a steel plate as a material, and as shown in FIGS. 3 and 4, a pair of side walls 42a spaced from each other,
42b and the upper plate portion 42c that is continuous between the upper edge portions of the side walls 42a and 42b form a step portion 42, and from the lower edge portion of the step portion 42 to the side walls 42a, 42.
the first and second lower plate portions 44a, 44b in a direction orthogonal to b
Is a member formed continuously. In addition, the first and second
Stoppers 44a ₁ and 44b ₁ continuously rising from the first and second lower plate portions 44a and 44b are formed on the right side positions of the lower plate portions 44a and 44b in the vehicle width direction.
These stoppers 44a ₁ and 44b ₁ face a restriction member 37 joined to the side surface of the mount insulator 34 facing the left side in the vehicle width direction.

A connecting bolt (fastening bolt) 44a ₂ having a screw portion directed downward is disposed on the first lower plate portion 44a, and a bolt insertion hole 44b ₂ is formed on the second lower plate portion 44b. together we are, in the upper plate portion 42c, the bolt insertion holes 42c ₁ is formed. Here, as shown in FIG. 4, the bolt insertion hole 42c ₁ of the upper plate portion 42c is located closer to the left side in the vehicle width direction than the reference line K connecting the axial centers of the connecting bolt 44a ₂ and the bolt insertion hole 44b _2. Is formed in.

As shown in FIG. 3, the connecting bolt 44a ₂ , the bolt insertion hole 44b ₂ and the bolt insertion hole 42c ₁ are connected to the connecting portion pedestal 3 of the unit side bracket 38.
Bolt insertion hole 40a formed in 8b, stud bolt 4
0b and screw holes 40c.

Further, as shown in FIG. 4, one opening of the stepped portion 42 is gradually closed by the other side wall 42b bent toward the one side wall 42a, and the end of the other side wall 42b is closed. In the joint portion 36 of the press-fitting pin 36a.
An engagement hole 42d having substantially the same size as the outer diameter of a ₂ is formed. Then, the collar portion 3 is formed on the outer peripheral end surface around the engagement hole 42d.
6a ₃ is in contact until the press-fit pin 36a joins 36a ₂
Is inserted into the engagement hole 42d and both the joint portion 36a ₂ and the step portion 42 are joined by fillet welding, whereby the press-fitting pin 36a and the joint plate 36b are integrated to form the joint portion 36.

Then, the vibration isolator 2 comprising the above-mentioned components.
To dispose the power unit 6 between the right end of the power unit 20 in the vehicle width direction and the vehicle body side member 33, first, the press-fit pin 3 is inserted into the inner cylinder member 34 c of the mount insulator 34.
The mount insulator 34 and the connecting portion 36 are connected by press-fitting 6a. Further, the unit fixing portion 38 a of the unit side bracket 38 abuts on the right end of the engine 22 and is fixed to the engine 22 via the bolt 50.

Next, the pair of flange portions 34a ₂ of the mount insulator 34 are brought into contact with the side member 33 on the vehicle body side, and the bolt insertion holes 34 of the flange portions 34a ₂ are inserted.
The bolts 40 are inserted into the a ₃ and 34 a ₄ from above, and the bolts 40 are screwed into the screw holes of the vehicle body side member 33 to be tightened.
Is fixed on the vehicle body side member 33. The unit-side bracket 3 fixed to the engine 22 is located below the connecting portion 36 connected to the mount insulator 34.
8 is arranged and the engine 22 is moved upward to bring the first and second lower plate portions 44a and 44b into contact with the flat surface 38b ₁ of the connecting portion pedestal 38b in a surface contact state, and to move the upper plate portion 42c. The lower surface is brought into contact with the upper surface of the protrusion 38b _{2 in} a surface contact state. At this time, as shown in FIG. 5, the stud bolt 40b is inserted through the bolt insertion hole 44b ₂ so that the threaded portion thereof is located above, and the connecting bolt 44a ₂ is inserted into the bolt insertion hole 4b.
0a is inserted and the screw part is located below,
Bolt insertion holes 42c ₁ and the screw hole 40c is opposed. Then, the nut 50 is screwed into the threaded portion of the connecting bolt 44a ₂ located below the bolt insertion hole 40a, and the nut 52 is threaded into the threaded portion of the stud bolt 40b located above the bolt insertion hole 44b _2. , The bolt insertion hole 42c ₁ and the screw hole 40c which correspond to each other, the connection bolt (fastening bolt) 54 is inserted from the bolt insertion hole 42c ₁ side and screwed into the screw hole 40c. Tighten 54. As a result, the connecting plate 36b is fixed to the unit side bracket 38, and the right end portion of the engine 22 is supported by the vehicle body side member 33 via the vibration isolator 26.

When the vibration of the engine 22 is input to the mount insulator 34 via the unit side bracket 38, the mount rubber 34b absorbs the vibration and reduces the vibration transmission to the vehicle body side member 33.

At this time, a predetermined force is input from the mount insulator 34 to the connecting portion 36 by the relative movement of the vehicle body side member 33 and the engine 22 due to the vibration of the engine, but the unit side bracket 38 and the connecting plate 36b are connected. Fixing bolts 40b, 44a ₂ , 54
Is required to have sufficient strength to withstand the above-mentioned force. 2 and 5, the position where the connecting plate 36b is fixed to the unit side bracket 38 is fixed position A (fixed position by the connecting bolt 44a ₂ and the nut 50) and fixed position B (fixed by the connecting bolt 54). Position) and a fixed position C (fixed position by the stud bolt 40b and the nut 52).

When the front-rear direction force F ₁ of the vehicle shown in FIG. 2 is input to the mount insulator 34 as the above-mentioned predetermined force, the force F ₁ is the distance between the mount insulator 34 and the connecting plate 36b. Acts on the fixed position of the connecting plate 36b as a moment defined by the length of, but in the present embodiment, since the fixed positions A, B, and C are provided sufficiently separated in the front-rear direction of the vehicle, each bolt 40b, 44a _2, 54 has a structure for receiving an input by sharing each Te. Therefore, the external force applied to each bolt is reduced, so that the fixing strength between the unit side bracket 38 and the connecting plate 36b is sufficiently secured.

Further, as shown in FIG. 1, when the force F _{2 in} the vertical direction of the vehicle is input to the mount insulator 34, the force F ₂ twists the connecting plate 36b (the connecting plate 36b is twisted and deformed). Power to try)
, But as shown in FIG.
6b has a pair of side walls 42a, 4a forming a step 42.
2b extends in the front-rear direction of the vehicle, and the pair of side walls 42
Since a and 42b are designed to receive twisting force,
The connection plate 36b does not deform. Therefore, even if the vertical force F ₂ of the vehicle is input, an external force that would damage the bolt is not input to each bolt, so that the fixing strength between the unit side bracket 38 and the connecting plate 36b by the bolt is sufficient. Secured in.

On the other hand, as shown in FIG. 1, when a force F ₃ is applied from the engine 22 to the right side in the vehicle width direction, the mount rubber 34b is deformed toward the right side in the vehicle width direction.
The rubber support portion 34a ₁ of the mount insulator 34 and the connecting plate 36b may come into contact with each other. However, in this embodiment, the stoppers 44a ₁ and 44b ₁ provided on the connecting plate 36b are mounted on the mount insulator 3
4 contacts the regulating member 37 provided on the side surface facing the left side in the vehicle width direction, the rubber supporting portion 34a ₁ and the connecting plate 36
Contact with b is prevented.

Therefore, the vibration isolator 26 having the above structure is
Since the connecting plate 36b forming the connecting portion 36 is formed by press forming using a steel plate as a material, it is possible to reduce the weight of the vibration isolator 26 as compared with a conventional device using a cast member and to connect the plate. Since the complicated secondary processing work of the plate 36b is unnecessary, the unit cost of the device can be significantly reduced.

Further, the force F in the longitudinal direction of the vehicle₁Mount
When inputting to the insulator 34, mount
The distance between the insulator 34 and the connecting plate 36b should be the length of the arm.
The moment is fixed at the fixed position of the connecting plate 36b.
Although it works, the connection plate 36b of the present embodiment has a vehicle
Fixing positions A, B, and C are installed with sufficient separation in the front-rear direction.
The bolts 40b, 44 at these fixed positions are
a_TwoStructure in which 54 and 54 share the respective moments
And the vertical force F of the vehicle _TwoIs Mau
Even when inputting to the insulator 34,
Power of F_TwoIs a twisting force on the connecting plate 36b
Even if it works, the step 42 of the connecting plate 36b is formed.
The pair of side walls 42a and 42b that are present receive a twisting force.
Then, the unit side bracket 38 and the connecting plate 36b
It is possible to secure sufficient fixing strength with the bolts of
You.

Further, the force F ₃ from the engine 22 to the right in the vehicle width direction is input to the vibration isolator 26, and the mount rubber 34
b is deformed toward the right side in the vehicle width direction and the connecting plate 36b is deformed.
Even if is moved to the rubber support portion 34a ₁ , since the stoppers 44a ₁ and 44b ₁ provided on the connecting plate 36b come into contact with the regulating member 37 provided on the side surface of the mount insulator 34 facing the left side in the vehicle width direction, the metal Rubber support 34a ₁ and connection plate 36b that may generate noise
Can be prevented from coming into contact with.

Although the above embodiments have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and the shape of the vibration isolator 26 may be within the scope not departing from the gist of the present invention. For example, the same effects as those described above can be obtained.

[0040]

As described above, according to the first aspect of the present invention.
In the power unit anti-vibration device, the connecting portion that is integrally connected to the elastic body of the mount insulator while being fixed to the mounting surface of the bracket is formed by press forming using a steel plate, and extends in the front-rear direction of the vehicle. Meanwhile, a connecting plate fixed to the mounting surface of the bracket via a fastening bolt, a base end portion fixed to a part of the connecting plate, and a distal end portion extending outward in the vehicle width direction is the elastic body. Since it is configured with a solid rod-shaped connecting pin that is attached to the shaft center of, the weight of the vibration isolator can be reduced compared to the conventional device that uses a cast member, and the complicated secondary part of the connecting part can be used. Since the processing work is unnecessary, the unit cost of the device can be significantly reduced.

Further, when a force in the front-rear direction of the vehicle is input to the mount insulator, a moment having the distance between the mount insulator and the connecting plate as the arm length acts on the fixed position of the connecting plate. ,
Since at least three fixing positions of the connecting plate, which are fixed to the mounting surface of the bracket through the fastening bolts, are provided in the front-rear direction of the vehicle, and the fixing position positions are spaced from each other, Since the fastening bolts at the fixed positions share the moments, the load applied to each fastening bolt is reduced. Therefore, it is possible to sufficiently secure the fixing strength between the bracket and the connecting plate by the fastening bolt.

According to the power unit anti-vibration device of the second aspect, even when the force in the vertical direction of the vehicle is input to the mount insulator and the force acts as a twisting force on the connecting plate, the bracket It is possible to sufficiently secure the fixing strength between the connection plate and the connection plate by the fastening bolt. That is, in the connection plate of the present invention, the pair of side walls that stand apart in the front-rear direction of the vehicle and stand up in the front-rear direction of the vehicle receive the force to prevent the connection plate from being deformed even when a twisting force is applied. It is possible to sufficiently secure the fixing strength with the fastening bolts.

Further, according to the power unit vibration isolator of the third aspect, a plate-shaped stopper is formed on the edge portions of the first lower plate portion and the second lower plate portion on the mount insulator side so as to continuously rise from the edge portions. Together with the
Since the non-metallic restricting member is arranged at a position facing the stopper of the mount insulator, a force outwardly directed in the vehicle width direction is input from the power unit to the mount insulator via the bracket and the connecting portion, and the elastic body is driven by the vehicle. Even when it deforms toward the right side in the width direction, the stopper abuts on the regulating member, so that it is possible to prevent contact with the mount insulator and the connecting portion, which may cause metal noise.

[Brief description of drawings]

FIG. 1 is a front view of an engine room showing a power unit and a vibration isolator according to the present invention.

FIG. 2 is a plan view of an engine room showing a power unit and a vibration isolator according to the present invention.

FIG. 3 is a developed perspective view showing a vibration isolator for a power unit of the present invention.

FIG. 4 is a diagram showing a cross-sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a view showing a connecting plate fixed to a mounting surface of a bracket according to the present invention.

FIG. 6 is an exploded perspective view showing a conventional vibration damping device.

FIG. 7 is a front view showing a conventional vibration damping device.

[Explanation of symbols]

20 Power Unit 22 Engine 26 Anti-Vibration Device 33 Vehicle Side Side Member (Vehicle Side Member) 34 Mount Insulator 34b Mount Rubber (Elastic Body) 36 Connection Portion 36a Press-fit Pin (Connection Pin) 36b Connection Plate 37 Restriction Member 38 Unit Side Bracket (Bracket) ) 38b Connecting part base (bracket mounting surface) 40b Stud bolt (fastening bolt) 42 Steps 42a, 42b Side wall 42c Upper plate part 44a First lower plate part 44b Second lower plate part 44a ₂ , 54 Connecting bolt (fastening bolt) ) 44a ₁ , 44b ₁ Stopper A, B, C fixed position

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takahisa Hiraide 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd.

Claims (3)

[Claims] 1. A bracket fixed to a lateral end of a power unit mounted horizontally, and a vehicle body-side member located outside of the bracket in the vehicle width direction.
A power unit protection including a mount insulator in which an axial center of an elastic body mounted inside is oriented in the vehicle width direction, and a connecting portion which is fixed to a mounting surface of the bracket and integrally connects with the elastic body of the mount insulator. In the vibration device, the connecting portion is formed by press forming using a steel plate, and is connected to a mounting surface of the bracket via a fastening bolt while extending in the front-rear direction of the vehicle, and the connecting plate. The base end portion is fixed to a part of the plate, and the tip end portion that extends outward in the vehicle width direction is configured with a solid rod-shaped connecting pin that is attached to the shaft center of the elastic body. At least three fixing positions of the connecting plate fixed through the fastening bolts are provided in the front-rear direction of the vehicle, and the fixing positions are spaced from each other. Power unit for anti-vibration device according to claim. 2. The connecting plate is provided with a step portion including a pair of side walls that stand apart in the front-rear direction of the vehicle and stand up, and an upper plate portion that extends between upper edge portions of the side walls.
A first lower plate portion extending forward from a lower edge portion of the front side wall;
It has a shape including a second lower plate portion extending rearward from a lower edge portion of a rear side wall, and the at least three fixing positions are the upper plate portion, the first lower plate portion, and the first lower plate portion. 2. The vibration isolator for a power unit according to claim 1, wherein each of the two bottom plates is provided. 3. A plate-shaped stopper which continuously rises from the edge portions of the first lower plate portion and the second lower plate portion on the mount insulator side is integrally formed, and the mount is also provided. 3. A non-metallic restricting member that restricts the movement of the connecting portion in the vehicle width direction by contact with the stopper is disposed at a position of the insulator facing the stopper. Anti-Vibration Device for Power Units.