JPH11147420A - Vibration prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a side member on the vehicle side from swelling outward in the lateral direction at the collision of a vehicle or other occasions. SOLUTION: This vibration prevention device 1 is provided with a mount insulator 7 which is installed on a side member on the vehicle side with a mount rubber intervened between an outer member 4 and an inner cylinder 5, and an engine unit installation portion 9, having a pin portion 8 fitted to the inner cylinder 5, and installed on the engine unit. In this device, a pin 8 projects at the side where the mount insulator 7 separates from the engine unit installation portion 9, and a stopper member 10 is installed on the projecting portion so that the stopper member 10 faces the outer member 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device interposed between an engine unit and a vehicle body side member to reduce vibration transmitted from the engine unit to the vehicle body.

[0002]

2. Description of the Related Art A conventional vibration isolator of this type includes a mount insulator in which an elastic body is interposed between an outer cylinder and an inner cylinder and which is attached to a vehicle body side member, and an inner cylinder of the mount insulator. It is known to have an engine unit mounting portion attached to the engine unit side having a pin portion to be inserted, and by absorbing relative vibration between the engine and the vehicle body by an elastic body of the mount insulator, Vibration transmitted from the engine to the vehicle body, especially engine noise, is reduced.

[0003]

By the way, the side member on the vehicle body side absorbs the collision energy by being crushed in the front-rear direction at the time of a vehicle collision. However, there is a problem that the amount of crushing in the vehicle front-rear direction is reduced and the collision energy that can be absorbed is reduced.

For this reason, it is necessary to prevent the vehicle body side member from bending in the vehicle lateral direction at the time of a collision, but it is difficult to simply make the vehicle body side member itself weak in the bending direction and strongly in the bending direction. There is a problem that it is difficult to collapse the vehicle body side member in the front-rear direction in response to various collision cases.

The present invention has been made in view of the fact that a vibration damping device is mounted on a vehicle body side member in order to solve such inconvenience, and the vehicle body side member moves in a vehicle lateral direction at the time of a vehicle collision or the like. It is an object of the present invention to provide an anti-vibration device that can prevent bending.

[0006]

According to a first aspect of the present invention, there is provided a vibration isolator according to the first aspect, wherein an elastic body is interposed between an outer member and a cylindrical inner member so that a vehicle body side member is provided. A mount insulator attached to the engine unit and an engine unit attachment portion attached to the engine unit side having a pin portion inserted into the inner peripheral portion of the inner member, wherein the engine of the mount insulator is The pin portion is protruded from a side away from the unit mounting portion, and a stopper member is attached to the protruding portion so as to face the outer member.

According to a second aspect of the present invention, in the first aspect, a dynamic damper is attached to a side of the stopper member that is separated from the mount insulator.

According to a third aspect of the present invention, in the vibration isolator according to the second aspect, the dynamic damper is attached to the stopper member.

[0009]

According to the first aspect of the present invention, at the time of a vehicle collision, the stopper member is securely caught by the mount insulator and prevents the vehicle body side member from expanding outward in the vehicle width direction. Can be reliably prevented from turning in the lateral direction of the vehicle.

According to the second aspect of the present invention, in addition to the first aspect of the present invention, the dynamic damper is arranged at a position where the amplitude of vibration is the largest on the tip end side of the pin portion, so that the dynamic damper functions most effectively. And a sufficient sound vibration reduction effect can be obtained.

According to the third aspect of the present invention, in addition to the second aspect of the present invention, it is not necessary to consider securing a space in the vehicle width direction when installing the dynamic damper.
The effect is obtained that the degree of freedom in designing the stopper member can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view for explaining a vibration isolator according to an embodiment of the present invention, and FIG.
3 is a plan view of the anti-vibration device viewed from above, FIG. 3 is a front view of the anti-vibration device viewed from the direction of arrow III in FIG. 2, and FIG.
Side view from the direction, FIG. 5 is a side view of the stopper member,
FIG. 6 is a plan view seen from the direction of arrow VI in FIG.

In FIG. 1 to FIG. 4, reference numeral 1 denotes an anti-vibration device disposed between the engine 2 and the vehicle body side member 3. The anti-vibration device 1 comprises an outer member 4 and an inner cylinder (inner member). )
A mount rubber (elastic body) 6 is interposed between the mount member 5 and a mount insulator 7 fixed to the vehicle body side member 3 and a pin portion 8 inserted into the inner cylinder 5 and fixed to the engine 2. And a stopper member 10 attached to the pin 8 on the side of the mount insulator 7 that is separated from the engine unit attachment 9.
And a dynamic damper 11 attached to the stopper member 10.

The mount insulator 7 includes a substantially inverted U-shaped outer member 4 and an inner cylinder 5 arranged at the center of the outer member 4, between the outer member 4 and the inner cylinder 5. Has a mount rubber 6 interposed by vulcanization bonding. The end surface of the inner cylinder 5 on the side away from the engine unit mounting portion 9 is flush with the end surface of the outer member 4. A mounting flange 12 is provided at the lower end of the outer member 4, and the mounting flange 12 is fixed to the vehicle body side member 3 by bolts (not shown) or the like. In the fixed state, the mount insulator 7 is arranged with the axis of the inner cylinder 5 facing the vehicle width direction.

The engine unit mounting portion 9 is disposed on the side of the mount insulator 7 facing the engine 2.
A substantially central portion in the vehicle front-rear direction is raised to face the inner cylinder 5. A pin portion 8 extending toward the vehicle body side member 3 is provided on a portion of the engine unit mounting portion 9 facing the inner cylinder 5.
Is provided concentrically with the inner cylinder 5, and the pin portion 8 is
And is inserted into the inner cylinder 5 by press-fitting.

In the inserted state, the tip of the pin 8 protrudes from the end surface of the inner cylinder 5 on the side away from the engine unit mounting portion 9. Also, the engine unit mounting portion 9
A mounting bolt 13 extends downward from a front end of the engine unit 2, and the engine unit mounting portion 9 is fixed to the engine 2 via the mounting bolt 13.

The stopper member 10 includes a first plate member 14 which is arranged on the side of the mount insulator 7 which is separated from the engine unit mounting portion 9 in parallel with and opposed to the mount insulator 7. A second plate member 15 extending in a direction away from the mount insulator 7 is formed at a lower portion of the 14 by bending. A cylindrical member 16 penetrates and is fixed to the rear end side of the first plate member 14 in the vehicle front-rear direction and above the second plate member 15 (see FIGS. 5 and 6). The rigidity of the stopper member 10 is increased by the cylindrical member 16 and the second plate member 15.

The cylindrical member 16 has an outer diameter and an inner diameter of the inner cylinder 5.
And the end 16 of the cylindrical member 16 protruding from the first plate member 14 toward the mount insulator 7.
a is concentrically extrapolated in a state where the respective end faces are in contact with the pin portion 8 protruding from the inner cylinder 5. In the extrapolated state, a screw portion 8a formed concentrically with the tip of the pin portion 8 protrudes from an end 16b of the cylindrical member 16 protruding to the side of the first plate member 14 away from the mount insulator 7. .

The screw portion 8 protruding from the end portion 16b
The nut 17 is screwed into the nut a so that the stopper member 10 is attached to the mount insulator 7 so as to face the mount insulator 7 on the side away from the engine unit attachment portion 9 of the mount insulator 7. The ends of the plate members 14 and 15 on the front side of the vehicle are located forward of the outer member 4 of the mount insulator 7.

A screw member 18 is formed in a portion of the first plate member 14 on the side of the side remote from the mount insulator 7 above the cylindrical member 16 so as to protrude in parallel with the pin portion 8. The dynamic damper 11 is attached to the member 18.

Like the mount insulator 7, the dynamic damper 11 absorbs relative vibration between the engine 2 and the vehicle body side member 3 to cut off transmission of engine noise during acceleration / deceleration to the vehicle body. Screw member 1
It is formed by vulcanizing and bonding an inverted U-shaped rubber 20 to a cylindrical member 19 shorter than 8. Then, the cylindrical member 19 is extrapolated to the screw member 18 and the first plate member 14 of the cylindrical member 19 is
By screwing a nut 21 onto a screw member 18 protruding from the end on the side away from the mounting member 7, the dynamic damper 11 is mounted on the mount insulator 7 of the stopper member 10.
Attached to the side away from

In the vibration isolator 1 having such a configuration, the engine 2 moves forward due to inertia or the like at the time of a vehicle collision, and the energy is transferred to the vehicle body side member 3 through the pin portion 8 and the mount insulator 7 in the vehicle longitudinal direction. It works in the crushing direction. At this time, even if the vehicle body side member 3 is bent so as to expand outward in the vehicle width direction, the stopper member 10 (engine 2 side) is securely hooked on the mount insulator 7 (vehicle body side member 3 side). Stopper member 1
Since the plate member 15 formed at 0 has increased rigidity as a flange, the swelling of the vehicle body side member 3 outward in the vehicle width direction can be prevented, and the swelling can be reliably prevented. When the vehicle body side member 3 bends inward in the vehicle width direction, it interferes with the engine 2 and further bending is restricted.

The engine 2 and the vehicle body side member 3
A dynamic damper 11 that absorbs relative vibration with the mount insulator 7 and blocks transmission of engine noise during acceleration / deceleration to the vehicle body side is a side of the stopper member 10 that is separated from the mount insulator 7, that is, a tip of the pin portion 8. Since the dynamic damper 11 is mounted at the position where the amplitude of vibration is largest on the side, the dynamic damper 11 can function most effectively, and a sufficient sound vibration reduction effect can be obtained.

Furthermore, as shown in this embodiment, the cylindrical member 1
When a structure is employed in which the rigidity of the stopper member 10 is increased by extrapolating the concentric 6 with the pin portion 8 or arranging the second plate member 15 on the lower side in the circumferential direction of the cylindrical member 16 by bending. If the dynamic damper 11 is directly attached to the tip of the pin portion 8, it is necessary to consider securing a space in the vehicle width direction. In this embodiment, however, the dynamic damper 11 is attached to the first member of the stopper member 10. Plate member 1
4 eliminates such concerns, and is not affected by the dynamic damper 11 around the pin portion 8 when designing for the purpose of improving the rigidity of the stopper member 10 and the like. Can be improved.

In this embodiment, the case where the dynamic damper 11 is attached to the stopper member 10 is taken as an example. However, the stopper member 10 may be attached directly to the tip of the pin 8 as a matter of course. It is.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view for explaining an anti-vibration device as an example of an embodiment of the present invention.

FIG. 2 is a plan view of the vibration isolator of FIG. 1 as viewed from above.

FIG. 3 is a front view as viewed from the direction of arrow III in FIG. 2;

FIG. 4 is a side view as viewed from the direction of arrow IV in FIG. 2;

FIG. 5 is a side view of the stopper member.

FIG. 6 is a plan view seen from the direction of arrow VI in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vibration isolator 2 ... Engine 3 ... Car body side member 4 ... Outer member 5 ... Inner cylinder (inner member) 6 ... Mount rubber (elastic body) 7 ... Mount insulator 8 ... Pin part 9 ... Engine unit mounting part 10 ... Stopper member 11: Dynamic damper

Claims (3)

[Claims] 1. A mount insulator having an elastic body interposed between an outer member and a cylindrical inner member and attached to a vehicle body side member, and a pin portion inserted into an inner peripheral portion of the inner member. A vibration isolator having an engine unit mounting portion attached to the engine unit side, wherein the pin portion protrudes on a side of the mount insulator away from the engine unit mounting portion, and a stopper member is provided on the protruding portion. An anti-vibration device characterized by being attached to face the outer member. 2. A vibration damping device according to claim 1, wherein a dynamic damper is attached to a side of said stopper member which is separated from said mount insulator. 3. The anti-vibration device according to claim 2, wherein the dynamic damper is attached to the stopper member.