JPH0711308B2 - Mounting device for automobile engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle engine mounting device that elastically supports an automobile engine.

<Prior Art> Generally, in a mounting device for an automobile engine, a low-frequency vibration having a large amplitude (displacement) generated in the engine at engine start (idling) or sudden start is attenuated to transmit the vibration to the vehicle body side. Lowering, while driving,
Attenuating the transmission of the vibration to the engine side by attenuating the low-frequency vibration having a large amplitude generated on the vehicle body side due to the unevenness of the road surface, etc.
With respect to high-frequency vibration having a small amplitude that occurs in the engine during high-speed traveling, characteristics such as damping the vibration and propagating the vibration to the vehicle interior to increase noise in the vehicle interior are required.

In order to satisfy the above-mentioned requirements, various types of fluid-filled engine mount devices have recently been proposed in which a rubber elastic body interposed between an engine and a vehicle body has a decompression type damping mechanism acting by a change in the height of the rubber elastic body. ing.

An example of this fluid-filled engine mount device is described in JP-A-59-8529.

That is, the metal fittings on the engine side are attached to the engine through the bolts. The metal fittings on the vehicle body side are attached to a vehicle body frame or the like via bolts. A hollow mount rubber is vulcanized and bonded between the two metal fittings. The engine side metal fitting is provided with a partition plate and a diaphragm. Thus, chambers are formed on the upper and lower sides of the partition plate, and the working fluid is filled in each chamber.

A cylinder having a hole that acts as an orifice is fixed to the partition plate, and the cylinder communicates the both chambers.

In the mounting device having the above-described configuration, the mounting rubber is deformed by the vibration of the engine to change the volume of one chamber, so that the working fluid moves between the two chambers through the cylindrical hole, and the orifice action of the hole is caused. The vibration of the engine is attenuated by.

<Problems to be Solved by the Invention> By the way, in the conventional engine mount device in which the hydraulic damping mechanism starts to operate simultaneously with the start of the height change of the mount rubber (volume change of both chambers), If the spring constant of the mount rubber is set large enough to sufficiently dampen low-frequency vibrations with large amplitude, the change in spring constant and the damping force will be excessive for high-frequency vibrations with small amplitude. Therefore, if the spring constant of the mount rubber is set to a small value so that the high frequency vibration cannot be sufficiently damped, the low frequency vibration cannot be damped sufficiently. There is a problem that the vibration damping ability has a great influence on the setting.

In addition, in a mounting device with a built-in hydraulic damping mechanism, pressure is generated in the working fluid filled inside the mount rubber, which affects the durability of the mount rubber itself. There is a problem that it becomes.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and obtain a mounting device that satisfies the above-mentioned requirements.

<Means for Solving the Problems> According to the present invention, the object is to fix the rubber block, the engine side mounting plate fixed to the upper surface of the rubber block and the lower surface of the rubber block, and bend at both ends. In a mount device for an automobile engine, comprising a vehicle body side mounting plate having a rising portion and a stopper rubber inside the rising portion, a hollow chamber opening to one side in a vertical direction on one side surface of the mounting device. Of the fixed casing having the plate and the wall surface of the hollow chamber with a minute gap held between the movable resistance plate and the high-viscosity viscous body filled in the hollow chamber and the hollow chamber. A viscous shear resistance generating device including a seal body for sealing the opening side fixes the fixed casing to one of the engine side mounting plate and the vehicle body side mounting plate and the movable resistance plate to the other side to integrally form the fixed casing. It is achieved by a mounting device for an automobile engine, which is characterized by being mounted.

In the above structure, the high-viscosity viscous body filled in the hollow chamber of the fixed casing has a viscosity of, for example, 10,000 to 100,000 poises, and polyolefin-based, polysiloxane, etc. are used.

This high-viscosity viscous body is interposed in a minute gap between the movable resistance plate and the hollow chamber wall surface of the fixed casing, and when the movable resistance plate and the hollow chamber wall surface are relatively displaced at a constant speed, the resistance force of the viscous body is The characteristic that the resistance force at high frequency shows an extremely small value compared to the resistance force at low frequency, depending on the frequency.
In other words, the resistance to low-frequency vibration with large amplitude (displacement) has a characteristic that the resistance is much larger than the resistance to high-frequency vibration with small amplitude.

The above-mentioned characteristics of the high-viscosity viscous body match the characteristics required for the engine mount device described above.

The engine mount device of the present invention is mounted and fixed between the engine and the vehicle body with the plate surface of the movable resistance plate aligned with the axial direction of the engine roll shaft.

<Operation> Preferably, two engine mount devices are used to support the engine on the vehicle body obliquely from each other.

In this state, when low-frequency vibration with a large amplitude occurs in the engine or the vehicle body, a large relative displacement occurs between the engine and the vehicle body. Due to this relative displacement, the rubber block of the engine mount device undergoes shear deformation, and the viscous shear resistance generator integrally attached to the mount device is activated.

In the viscous shear resistance generator, a fixed casing fixed to either one of the engine side mounting plate and the vehicle body side mounting plate and a fixed casing fixed to the other side, between the fixed casing and the hollow chamber wall surface. A large relative displacement is generated between the movable resistance plate and the movable resistance plate inserted while holding the minute gap.

However, since high viscosity viscosity is present in the minute gap, a viscous step resistance force is generated there, and the low frequency vibration is greatly attenuated by the resistance force.

Further, in the case of high-frequency vibration with a small amplitude generated in the engine, the damping action due to the generation of the viscous shear resistance force is not performed, and the vibration is absorbed by the rubber block having the set spring constant.

<Embodiment> The present invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings showing a preferred embodiment thereof.

In the figure, 1 is an engine mount device.

Reference numeral 2 denotes a rubber block of the mount device 1.

An engine-side mounting plate 3 is vulcanized and fixed to the upper surface of the rubber block 2, and a bolt 4 having an end protruding from the mounting plate 3 is fixed to the mounting plate 3.

Reference numeral 5 denotes a vehicle-body-side mounting plate that is vulcanized and fixed to the lower surface of the rubber block 2, and the mounting plate 5 has bent rising portions 6 at both ends thereof.

Reference numeral 7 denotes a bolt fixed to the vehicle body side mounting plate 5 by projecting an end portion thereof to the lower surface side of the mounting plate 5.

Reference numeral 8 denotes a stopper rubber body vulcanized and fixed to the inside of the bent rising portions 6 at both ends of the vehicle body side mounting plate 5.

In the above structure, when the engine is mounted on the mount device 1, the rubber block 2 is sheared and deformed by the weight of the engine and is fixed to the engine side mounting plate 3 by the bolts 4.
In the unloaded state, the bolts 7 fixed to the vehicle body side mounting plate 5 are inclined in advance in consideration of the amount of deformation in the unloaded state.

Reference numeral 9 denotes a fixed casing. The fixed casing 9 has a base 12 having a horizontal portion 10 and a vertical portion 11 formed by bending one end of the horizontal portion 10, and a rectangular shape fixed to the vertical portion 11 of the base 12. A frame body 15 having flat portions 13 and rising portions 14 on three sides of the flat portion 13.
The fixed casing 9 has a hollow chamber 16 having a rectangular cross section and having an upward opening, which is formed by the vertical portion 11 of the base body 12, the rectangular flat surface portion 13 and the rising portion 14 of the frame body 15. .

The fixed casing 9 is positioned on one side surface side of the mount device 1 with the horizontal portion 10 of the base 12 fixed to the lower surface of the vehicle body side mounting plate 5.

Reference numeral 17 denotes a movable resistance plate. One end of the movable resistance plate 17 is fixed to the engine side mounting plate 3, and the other end is a curved portion.
18 with the hollow chamber 16 of the fixed casing 9
A moving region is left in each of the longitudinal directions of 16 and a minute gap S is inserted between the plate surface of the resistance plate 17 and the wall surface of the hollow chamber 16.

Reference numeral 19 is a high-viscosity viscous body filled in the hollow chamber 16.

Reference numeral 20 denotes a seal body which covers the opening of the hollow chamber 16 and is capped and fixed to the fixed casing 9. The seal body 20 has a movable resistance plate.
A slit 21 is formed over the moving area of the movable resistance plate 17 to allow the movement of the movable resistance plate 17.

A fixed casing 9 fixed to the vehicle body side mounting plate 5 and one end thereof is fixed to the engine side mounting plate 3, and the other end thereof is inserted into the hollow chamber 16 of the fixed casing 9 while holding the hollow chamber wall surface and a minute gap S therebetween. The movable resistance plate 17, the high-viscosity viscous body 19 filled in the hollow chamber 16, and the seal body 20 which is capped and fixed to the fixed casing 9 so as to cover the opening of the hollow chamber 16 form a viscous shear resistance generator R. It is configured.

The engine mount device 1 having the above-described configuration is fixed between the engine E and the vehicle body B with the plate surface of the movable resistance plate 17 aligned with the axial direction of the engine roll shaft (not shown).

FIG. 4 shows the mounting state of the rubber block 2
The engine side mounting plate 3 fixed to the upper surface of the above is fixed to the bracket 22 fixed to the engine E with bolts 4 and nuts 23. Body side mounting plate 5 fixed to the lower surface of the rubber block 2
To the body side bracket 24 with bolts 7 and nuts 25.

Then, the vehicle body side bracket 24 is attached to the side member 26 of the vehicle body B.
Fixed to the upper surface of the suspension frame 27 mounted on
The engine E is elastically supported on the engine mount device 1 in an inverted V shape.

In this embodiment, however, when low-frequency vibration with a large amplitude occurs in the suspension frame 27 of the vehicle body B due to rolling of the engine E, or in the suspension frame 27 of the vehicle body B due to unevenness of the road surface, etc. A large relative displacement in the A direction occurs between them.

Due to this relative displacement, the rubber block 2 of the engine mount device 1 undergoes shear deformation, and the viscous shear resistance generator R integrally attached to the mount device 1 is operated.

In the viscous shear resistance generator R, the fixed casing 9 fixed to the vehicle body side mounting plate 5 and the engine side mounting plate 3 are fixed, and a small gap S is formed in the hollow chamber 16 of the fixed casing 9 and the wall surface of the hollow chamber. Inserted movable resistance plate
There is a large relative displacement with 17.

Since the high-viscosity viscous body 19 is interposed in the minute gap S, a viscous shearing resistance force is generated there, and the low-frequency vibration is significantly damped by the resistance force.

In the preferred embodiment, the fixed casing 9 is fixed to the vehicle body side mounting plate 5 and the movable resistance plate 17 is fixed to the engine side mounting plate 3, but the present invention is not limited to this, and for example, the engine side mounting plate 3 is used. Fixed casing 9 to the vehicle body side mounting plate 5
Alternatively, the movable resistance plates 17 may be fixed and implemented.

<Effect> The engine mount device of the present invention has the above-described configuration and operation, and has the following various excellent effects.

The low-frequency vibration having a large amplitude generated in the engine or the vehicle body is significantly attenuated by the viscous shear resistance force generated in the viscous shear resistance generator integrally provided in the mount device. Transmission to the engine side is greatly reduced.

Since the viscous shear resistance of a high viscosity viscous body is used,
The structure is simple and can be made compact as compared with the conventional one using the orifice action.

It can be mounted on existing engine mounts.

[Brief description of drawings]

FIG. 1 is a front view showing an engine mount device of the present invention,
2 is a plan view of FIG. 1, FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG. 4 is a view showing a mounting state of the engine mount device. 1 ... Engine mounting device, 2 ... Rubber block, 3 ... Engine side mounting plate, 5 ... Vehicle side mounting plate, 9 ... Fixed casing, 16 ... Hollow chamber, 17 ... Movable resistance plate, S ... … Small gap, 19 …… High viscosity viscous body, 20 …… Seal body, R …… Viscous shear resistance generator.

Claims (1)

[Claims] 1. A rubber block, an engine-side mounting plate fixed to the upper surface of the rubber block, and fixed to the lower surface of the rubber block, provided with bent rising portions at both ends, and stopper rubber members inside the rising portions. In a mounting device for an automobile engine including a vehicle body side mounting plate, a fixed casing having a hollow chamber opening in one of the up and down directions and a plate surface are provided on one side surface of the mounting device. Viscous shear resistance consisting of a movable resistance plate inserted in the hollow chamber with a minute gap held between the hollow chamber and the high-viscosity viscous body filled in the hollow chamber, and a seal body sealing the opening side of the hollow chamber. The generator is integrally mounted by fixing the fixed casing to one of the engine side mounting plate and the vehicle body side mounting plate and fixing the movable resistance plate to the other side. Jin of the mounting device.