JPS62137439A - Mounting device for automobile engine - Google Patents

Abstract

PURPOSE:To achieve the attenuation in low frequency vibration to a great extent by providing a hollow chamber inside a rubber block and providing, on one end thereof, a fitting member fixed with a division plate and arranged in the hollow chamber, and further filling up a viscous body of high viscosity in the hollow chamber. CONSTITUTION:When a low frequency vibration having a large amplitude is caused on the suspension frame 17 of a vehicle body B due to the rolling of an engine E or the unevenness of road surfaces, or the like, a relative displacement in the A direction is caused between the engine E and the suspension frame 17. By this relative displacement, a rubber block 2 is subjected to shearing deformation, and the viscous body 11 of high viscosity hermetically filled in a hollow chamber 4 is agitated, and flows through clearances S and S1. Accordingly, in an engine mounting device 1, viscous resistance force due to the agitation of the viscous body 11 of high viscosity and passage resistance force while flowing through respective clearances S, S1 are caused, and by these resistance forces low frequency vibration can be attenuated to a great extent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to an automobile engine mounting device that elastically supports an automobile engine.

[Conventional technology 1] Generally speaking, mounting devices for automobile engines include ■Engine start! To attenuate low-frequency vibrations with large amplitudes (displacements) that occur in the engine when idling or when starting suddenly, thereby reducing the transmission of such vibrations to the vehicle body ■During driving, vibrations that occur on the vehicle body due to uneven road surfaces, etc. To attenuate high-amplitude low-frequency vibrations and insulate the transmission of the J & J to the engine side, and to prevent the engine from collaborating with the J and J, ■ against high-frequency vibrations with low amplitude that occur during high-speed running peaks. is required to have characteristics such as damping the shaking J and suppressing the vibration from propagating to the QI room and increasing the noise inside the conductor.

In order to satisfy the above-mentioned requirements, in recent years, a fluid-filled engine mount device has been developed that incorporates a hydraulic damping structure in a rubber body interposed between the engine and the vehicle body that acts by changing the height of the rubber elastic body. Kaisho! It is known from the publication No. 17-25.536.

One row of this fluid-filled engine mount device is shown in FIG. 6, although it is not shown in the drawings.

In the figure, a indicates a metal fitting on the engine side, which is attached to the engine via a bolt b. C is a metal fitting on the vehicle body side, which is attached to the vehicle body frame via bolt d. e is a hollow mount rubber that is vulcanized and bonded between the metal fittings a and C.

A partition plate Q and a die A7 flamm h are attached to the metal fitting C by a holding metal fitting f. Thus, chambers i and F are formed on the upper side of the partition plate Q, and each chamber i,
12 is filled with a working fluid j.

A cylinder β having a hole k acting as an orifice is fixed to the partition plate q, and communicates the chambers 1 and i2.

In the above-mentioned configuration, the mount rubber e deforms due to engine vibration and changes the volume of the mount rubber e, which causes the working fluid J to flow into both chambers. ,! 2 through the hole k of the cylinder l, and the action of the orifice in the hole damps the movement of the engine.

[Problems to be solved by the invention] By the way, the change in the height of the mount rubber e (chamber!1.!
In the conventional engine mount device, in which the hydraulic damping mechanism starts acting at the same time as the volume change (volume change 2) starts, the change in the spring constant of the mount rubber e is proportional to the change in the damping force, and low frequency vibration with large amplitude If the spring constant of the mount rubber e is set to a large value so as to sufficiently attenuate the If the spring constant of the mount rubber e is set to a small value, low frequency vibrations cannot be sufficiently damped.The setting of the spring constant of the mount rubber e has a large effect on the vibration damping ability.

Also, it is complicated to obtain the orifice action of the working fluid j.
There are problems such as requiring Rt and further increasing the size of the device itself.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a simple and compact Mount i-device that satisfies the above-mentioned requirements.

Means for Solving Problem E] According to the present invention, the object is to provide a rubber block, a chamber formed in the rubber block by opening at one end side of the rubber block, and a chamber formed in the rubber block by opening at one end side of the rubber block; One mounting member that is closed and attached to one end of the rubber block, the other mounting member that is attached to the other end of the rubber block opposite to the one end, and the inner wall of the rubber block that defines the chamber. An automobile engine mount 5A comprising a partition plate arranged in a chamber with a gap formed therebetween and having one end fixed to one mounting member, and a high viscosity viscous material filled in the chamber. This is achieved by placing

In the apparatus of the present invention, the high viscosity material to be hermetically filled into the hollow chamber has a viscosity of 10,000 to 100,000 poise, and polyolefins, polysilone, sans, etc. are used.

When this highly viscous viscous body moves at a constant speed, its resistance depends on the frequency, and the resistance at high frequencies is extremely small compared to the resistance at low frequencies.
In other words, the resistance force against low frequency vibrations with large amplitude (displacement) is much larger than the resistance force against high frequency vibrations with small amplitude.

The characteristics of the high-viscosity viscous body described above correspond to the characteristics required for the engine mound 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 partition plate aligned in the axial direction of the engine roll axis.

[Function] Two engine mount devices are used to support the engine on the vehicle body from diagonal directions.

In this state, if low-frequency vibrations with large amplitude occur 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 is sheared and deformed, and the high viscosity viscous material hermetically filled in the hollow chamber of the rubber block is agitated, and the partition plate arranged in the hollow chamber and the hollow It flows through the gap formed between the bottom and the wall of the chamber.

Therefore, in the engine mount device, viscous resistance due to stirring of the highly viscous material and flow path resistance when flowing through each gap are generated, and low frequency vibrations are significantly attenuated by these resistance forces.

Further, high frequency vibrations with small amplitudes generated in the engine are absorbed by the rubber block having a set spring constant.

[Embodiments] The present invention will be explained below with reference to FIGS. 1 to 5 of the accompanying drawings showing embodiments thereof.

In the figure, 1 is an engine mount device.

2 is a rubber block of the mounting device 1, and the rubber block 2 is formed with a hollow chamber 4 having a rectangular cross section and having an opening 3 at one end.

Reference numeral 5 designates an engine side mounting plate which is vulcanized and fixed to one end of the rubber block 2, and a bolt 6 whose end portion protrudes beyond the mounting plate 5 is fixed to the mounting plate 5.

One mounting member is constituted by the mounting plate 5 and the pole 1-0.

Reference numeral 7 designates a vehicle body side mounting plate which is vulcanized and fixed to the other end of the rubber block 2 surrounding the opening 3 of the hollow chamber 4, and the mounting plate 7 has end portions at opposing positions in the longitudinal direction of the hollow chamber 4. Bolts 8 projecting from the mounting plate 7 toward the opening 3 of the hollow chamber 4 are fixed.

Reference numeral 9 denotes an lff1 closing plate that covers the opening 3 of the hollow chamber 4 and is fixed to the vehicle body side mounting plate 7, and the closing plate 9 closes the hollow chamber 4.
is sealed. The mounting plate I, the bolts 8, and the closing plate 9 constitute the other mounting member.

In the above configuration, it is also possible to fix the poles 1-8 to the closing plate 9 and directly vulcanize and fix the closing plate 9 to the rubber block 2 without using the vehicle body side mounting plate 7.

Reference numeral 10 denotes a partition plate whose one end is fixed to the closing plate 9, and the partition plate 10 has its base facing the bolt 8 fixed to the vehicle body mounting plate 7, and the other end is connected to the bottom of the hollow chamber 4. It is disposed in the hollow chamber 4 with a gap S between it and a gap S1 between the wall surfaces of the hollow chamber 4 on both sides.

Reference numeral 11 denotes a high-viscosity viscous material that is tightly packed into the hollow chamber 4 .

The engine mount device 1 having the above-mentioned configuration connects the engine and the vehicle body by aligning the plate surface of the partition plate 10 arranged in the hollow chamber 4 of the rubber block 2 in the axial direction of the engine roll axis (not shown). fixed between.

That is, as shown in FIG. 4, an engine-side mounting plate 5 fixed to one end of the rubber block 2 is connected to a bracket 12 fixed to the engine E with bolts 6, and a closing plate fixed to the mounting plate 7 is connected to the engine side mounting plate 5 fixed to one end of the rubber block 2. 9 to the vehicle body side bracket 14 with bolts 8 and nuts 15. Then, the vehicle body side bracket 14 is fixed to the upper surface of the suspension frame 17 mounted on the side member 16 of the vehicle body B, and the engine E is elastically supported on the engine mount device 1 in an inverted V shape.

Therefore, in this embodiment, when low frequency vibrations with large amplitude occur in the suspension frame 17 of the vehicle body B due to rolling of the engine E or unevenness of the road surface, the vibration between the engine E and the suspension frame 17 is A large relative displacement in the incoming direction occurs between them.

Due to this relative displacement, the rubber block 2 of the engine mount device 1 is sheared and deformed, and the hollow chamber 4 of the rubber block 2 is
The high-viscosity viscous material 11 hermetically filled inside is stirred and flows through the gaps S and S1 formed between the partition plate 10 arranged in the hollow chamber 4 and the bottom and wall surface of the hollow v4.

Therefore, the high viscosity viscous body 1 is attached to the engine mount device 1.
1. Viscous resistance force due to stirring and each gap S.

When $1 flows, flow path resistance forces are generated, and low frequency vibrations are significantly attenuated by these resistance forces.

FIG. 5 shows another embodiment of the engine mount device 1, in which a hollow chamber 4 having a circular cross section is formed in the rubber block 2 of the engine mount device 1.

Furthermore, the opening? A3 may be provided on the engine side mounting member side.

[Effects] The engine mount device of the present invention has the above-mentioned configuration and operation, and has the following various excellent effects.

■Low-frequency vibrations with large amplitudes that occur in the engine or car body are greatly attenuated by the viscous resistance force and flow path resistance force caused by the stirring of the high viscosity material sealed in the hollow chamber of the rubber block. transmission to the vehicle body side or to the engine side is significantly reduced.

■The structure is simpler and more compact than conventional ones that utilize orifice action.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the engine mount device of the present invention;
Figure 2 is the ■-positive line view of Figure 1, and Figure 3 is the ■■ of Figure 1.
-■ Line drawing Figure 4 is a cross-sectional view showing several states of the engine mount device, Figure 5 is a cross-sectional view showing an example of the engine mount device, and Figure 6 is a cross-sectional view showing a conventional engine mount device. FIG. 1...Engine mount device, 2...
Rubber block, 3...Opening, 4...
Hollow chamber, 5...Engine side mounting plate, 9...
...Opening plate, 10...Partition plate, 11...
・High viscosity viscous material, S, Sl... gap.

Claims (1)

[Claims] a rubber block; a chamber formed in the rubber block with an opening at one end of the rubber block; one mounting member that closes the opening of the chamber and is attached to one end of the rubber block; The rubber block is disposed in the chamber with a gap formed between the other mounting member attached to the other end of the opposing rubber block and the inner wall of the rubber block defining the chamber, and one end is attached to the one mounting member. A mounting device for an automobile engine comprising a fixed partition plate and a highly viscous viscous material filled in the chamber.