JPH04145243A - Liquid seal type engine mount - Google Patents

Abstract

PURPOSE:To prevent oscillations over a wide range by dividing a liquid seal part of an elastic shock-absorbing member into first and second liquid chambers, and providing a partition wall member which has a liquid communication passage according to low-frequency oscillation, a soft elastic plate member which restricts hydraulic pressure change caused by intermediate-frequency oscillation in the first liquid chamber, and a weight member which restricts hydraulic pressure change caused by high-frequency oscillations in the first liquid chamber. CONSTITUTION:Engine oscillation is transmitted to an elastic shock-absorbing member 6. Low-frequency oscillation causes liquid flow through a liquid communication passage 26 between a first liquid chamber 21 and a second liquid chamber 22, through the shock generated thereby oscillation transmission to a vehicle side bracket 4 through a partition wall member 19 and a cup-like member 9 is prevented. Hydraulic pressure change in the first liquid chamber 21 caused by intermediate-frequency oscillations is eliminated by deformation of a soft elastic plate member 28 such as rubber, and the oscillations are prevented from transmitting to the vehicle side bracket 4. Hydraulic pressure change in the first liquid chamber 21 caused by oscillation of the higher frequencies is prevented from transmitting to the vehicle side bracket 4 by means of an elastic member 30 and a weight member 31 having transmission ratios lowered in respect to the high-frequency oscillations.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides an elastic buffer member disposed between an engine and a vehicle body on which the engine is mounted in a vehicle, and provided with a liquid sealing portion inside. This invention relates to a liquid-filled engine mount that is configured with a liquid-filled engine mount.

(Prior Art) In a vehicle, in order to suppress the vibration of the vehicle body during driving and the accompanying noise inside the vehicle, by alleviating the propagation of vibrations generated when the engine is operating to the vehicle body,
Usually, an engine is attached to a vehicle body by interposing a plurality of engine mounts, which are elastic and have a vibration-proofing function, between the engine and the vehicle body.

As such an engine mount, for example,
As shown in Japanese Patent No. 142, a device has been proposed that includes an elastic shock absorbing member made of rubber or the like, and the elastic shock absorbing member has a liquid sealing portion inside. In such a liquid-filled engine mount that is equipped with an elastic buffer member having a liquid sealing part inside, the liquid sealing part inside the elastic buffer member is provided with a through hole. The liquid chamber is divided into two liquid chambers by a partition wall, and a predetermined volume of space is left in which liquid is sealed. The fluid flows from one fluid chamber to the other through the through holes provided in the diaphragm, thereby reducing fluid pressure changes caused by engine vibrations and reducing vibrations transmitted from the engine to the vehicle body. It will be suppressed.

(Problems to be Solved by the Invention) In the liquid-filled engine mount as described above, it is assumed that the engine attached to the vehicle body through the engine mount is in various operating states. In situations where vibrations are transmitted from the engine, the internal elastic shock absorber is effective against vibrations in a relatively low frequency range that are transmitted from the engine when operating at relatively low rotational speeds such as idling. In response, the liquid in the liquid enclosure of
The fluid flows from one of the two fluid chambers to the other through the through hole provided as a fluid flow path, thereby reducing fluid pressure changes caused by engine vibrations and reducing vibrations transmitted from the engine to the vehicle body. will be suppressed. However, for example, elastic shock absorbers can be used for vibrations in a medium frequency range or a relatively high frequency range transmitted from an engine operating at a medium or relatively high rotational speed. The liquid in the liquid enclosure inside the engine hardly responds to changes in fluid pressure caused by vibrations in the medium frequency range or relatively high frequency range transmitted from the engine. vibrations transmitted from the engine in the medium or relatively high frequency range. However, it ends up being transmitted to the vehicle body without being suppressed.

In view of these points, the present invention is provided with an elastic shock absorbing member having a liquid sealing portion provided therein, and is arranged between an engine in a vehicle and a vehicle body in which the engine is mounted. Under these conditions, the vibrations transmitted from the engine include not only vibrations in a relatively low frequency range, but also vibrations in a medium frequency range, and even vibrations in a frequency range above the medium frequency range. Another object of the present invention is to provide a liquid-filled engine mount that can suppress transmission of vibrations to the vehicle body even in a relatively high frequency range.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a liquid-filled engine mount according to the present invention includes an engine connection portion to which an engine is mounted, and a vehicle body connection portion to which the engine is mounted. an elastic buffer member disposed between the engine connection part and the vehicle body connection part and having a liquid sealing part therein;
The liquid sealing portion is divided into a first liquid chamber portion and a second liquid chamber portion located below the first liquid chamber portion.
a liquid chamber that is partitioned into a liquid chamber portion and a liquid chamber portion that is partitioned into a liquid chamber portion, and that allows liquid flow between the first liquid chamber portion and the second liquid chamber portion in response to vibrations in a relatively low first frequency range of the engine. In addition to the partition wall member provided with the communication passage, a flexible member is disposed within the first fluid chamber portion and suppresses changes in fluid pressure caused by vibrations in a second frequency range higher than the first frequency range of the engine. The elastic plate member is supported by the partition wall member in the first liquid chamber portion via the elastic support member, and the second
A weight member is disposed to suppress the transmission of hydraulic pressure changes caused by vibrations in a third frequency range that is equal to or higher than the frequency range.

(Function) In the liquid-filled engine mount according to the present invention configured as described above, vibrations transmitted from the engine in a relatively low frequency range are mainly suppressed by the vibrations provided in the bulkhead member. The liquid in the liquid communication passage responds, and the liquid in the liquid sealing portion flows from one of the first and second liquid chamber portions to the other through the liquid communication passage, whereby the liquid sealing portion due to vibrations of the engine Fluid pressure changes in the engine are reduced, and vibrations transmitted from the engine to the vehicle body are suppressed. In addition, vibrations transmitted from the engine in a medium frequency range are mainly dealt with by a flexible elastic plate member, for example, a thin rubber plate, disposed within the first liquid chamber. The flexible elastic plate member reduces fluid pressure changes caused by medium frequency range vibrations from the engine in the first fluid chamber portion, thereby reducing fluid pressure from the engine. The transmission of vibrations in a certain frequency range to the vehicle body is suppressed. Furthermore, in response to vibrations transmitted from the engine in a frequency range above a medium frequency range, the weight member disposed within the first liquid chamber portion and the elastic support member supporting it are mainly used. The weight member and the elastic support member supporting it reduce fluid pressure changes caused by vibrations from the engine in a frequency range above a medium frequency range in the first fluid chamber portion. ,
As a result, transmission of vibrations from the engine in a frequency range above a medium frequency range to the vehicle body is suppressed.

(Example) FIG. 1 shows a first example of a liquid-filled engine mount according to the present invention.

The liquid-filled engine mount IA shown in FIG. 1 includes an engine side bracket 2 provided at a predetermined location on the engine installed in a vehicle, and a predetermined location on the vehicle body frame. It is interposed between the vehicle body side bracket 4 and used for attaching the engine to the vehicle body. The engine mount LA is attached to an elastic buffer member 62 formed of an elastic material such as rubber, a metal mounting plate portion 72 fixed to the upper end of the elastic buffer member 6, and a lower half of the elastic buffer member 6. A metal annular member 8 that is fixed to surround the
, and a retaining portion 8a formed at the lower end of the annular member 8.
It includes a metal cup-shaped member 9 formed with a flange portion 9a that engages with the flange portion 9a.

A recess 11 is formed in the upper half of the elastic buffer member 6, and a metal cup-shaped member 12 whose open end side is fixed to the mounting plate 7 is fixed to the recess 11. Further, a lower half portion of the elastic buffer member 6 surrounded by the annular member 8 is also formed with four portions 13, and a recessed portion 1 of the lower half portion is formed.
3 and the inner space of the cup-shaped member 9 form a sealed space. A bolt 14 has a head disposed within the inner space of the cup-shaped member 12, and a screw portion extending from the head penetrates the mounting plate portion 7 and projects upward.
The engine side bracket 2 is attached to the mounting plate part 7 by using a nut 15 screwed thereto, and a head is disposed within the inner space of the cup-shaped member 9, and a nut 15 extending from the head is used. A bolt 16 whose threaded portion penetrates the bottom plate portion of the cup-shaped member 9 and projects downward.
The cup-shaped member 9 is attached to the vehicle body side bracket 4 by using a nut 17 that is screwed into the nut 17 .

The sealed space formed by the recess 13 provided in the lower half of the elastic buffer member 6 and the inner space of the cup-shaped member 9 is made of rubber having a peripheral edge 18a fixed to the flange portion 9a of the cup-shaped member 9. diaphragm member 18 and an annular member 8 arranged above the diaphragm member 18.
The metal partition member 19 inserted into and engaged with the active portion 8b in the first space 21. Second space 22
and a third space 23. The first space 21 corresponds to the inner space of the recess 13 of the elastic buffer member 6 that is closed by the partition member 19, and the second space 22 corresponds to the space between the diaphragm member 18 and the partition member 19. Correspondingly, the third space 23 corresponds to the inner space of the cup-shaped member 9 closed by the diaphragm member 18.

The partition member 19 includes a first
It is formed by a metal plate member 24 and a second metal plate member 25 disposed on the second space 22 side. The first and second metal plate members 24 and 25 are integrated with respective flange portions 24a and 25a fixed to each other, and the first metal plate member 24 is connected to the finger portion of the annular member 8. 8b.

An annular space 26 is formed between the first metal plate member 24 and the second metal plate member 25, and a predetermined location in a portion of the first metal plate member 24 forming the annular space 26. A through hole 24b is provided to communicate the first space 2 and the annular space 26, and an annular space is provided at a predetermined location in a portion of the second metal plate member 25 forming the annular space 26. A through hole 25b is provided that communicates the second space 26 with the second space 22. Also, the first
Between the metal plate member 24 and the second metal plate member 25,
A plate-shaped member storage chamber 27 is formed at a position surrounded by the annular space 26.
A flexible elastic plate member 28, which is a flexible thin plate made of an elastic material such as rubber, is accommodated in the interior of the flexible elastic plate member 7. 1st
The first space 21 and the plate-like member storage chamber 2 are located in the portion of the metal plate member 24 that forms the plate-like member storage chamber 27.
A large number of through holes 24c are formed to communicate with 7.

As shown in FIG. 2, the first
In the part of the metal plate member 24 that forms the plate-like member storage chamber 27, on the side of the first space 21 which is above the part,
A disk-shaped weight member 31 formed of a metal plate such as an iron plate is fixed via a disk-shaped elastic member 30 formed of rubber or the like. Elastic member 30 and weight member 31
Each of the holes 24 has a large number of through holes 24 formed in a portion of the first metal plate member 24 that forms the plate-shaped member storage chamber 27.
Through holes 30a and 31a are formed at positions corresponding to c.

Then, the first space portion 21. a second space 22, and
An annular space 26 and a plate-shaped member storage chamber 27 formed between the first metal plate member 24 and the second metal plate member 25 constituting the partition member 19 are filled with a liquid such as ethylene glycol. is filled. That is, the first space 21 and the second space 22 form an I-th liquid chamber and a second liquid chamber, respectively (hereinafter referred to as the first liquid chamber and the second liquid chamber).
(The liquid chambers of the first metal plate member 24 will be described with numbers "21" and "22" respectively), and the annular space 26 is connected to the first metal plate member 24.
The first liquid chamber 2 uses the through hole 24b provided in the second metal plate member 25 and the through hole 25b provided in the second metal plate member 25 as a liquid inflow/outlet.
1 and the second liquid chamber 22 (hereinafter, the liquid communication path will be described with the number "26" attached thereto).

Further, in the plate-shaped member storage chamber 27, the liquid in the first liquid chamber 21 is transferred to a through-hole 31a provided in the weight member 31, a through-hole 30a provided in the elastic member 30, and a through-hole 30a provided in the elastic member 30. The flexible elastic plate member 28 accommodated in the plate-like member storage chamber 27 is configured to enter the liquid through a large number of through holes 24c formed in the portion forming the plate-like member storage chamber 27 in the plate-like member storage chamber 24. It is said to float inside.

When vibrations generated by the engine are transmitted to the engine mount IA having such a configuration through the engine side bracket 2, the vibrations from the engine side bracket 2 are transmitted through the mounting plate portion 7 to the elastic buffer member 6.
, and the fluid pressure in the first fluid chamber 21 formed within the elastic buffer member 6 is changed. In the engine mount IA, the diameters of the through holes 24b and 25b provided in the first metal plate member 24 and the second metal plate member 25, the inner diameter of the liquid communication passage 26, etc. are selected. Among the vibrations transmitted to the elastic buffer member 6, for example,
In response to vibrations in a relatively low frequency range of 10 Hz and around 10 Hz, the first liquid chamber 21 and the second liquid chamber 22 respond to the resulting fluid pressure fluctuation in the first fluid chamber.
Liquid flow is caused through the liquid communication path 26 between the two. Therefore, among the vibrations transmitted to the elastic buffer member 6, for example, the fluid pressure fluctuation in the first fluid chamber 21 caused by vibrations in a relatively low frequency range around 1 (B(z) and its surroundings is The liquid is absorbed by the buffering effect of the liquid flow between the first liquid chamber 21 and the second liquid chamber 22 through the communication path 26 and is transmitted to the vehicle body side bracket 4 through the partition member 19 and further through the cup-shaped member 9. is suppressed.

As a result, among the vibrations transmitted to the elastic buffer member 6, vibrations in a relatively low frequency range, for example, IOHZ and its surroundings, are suppressed from being transmitted to the vehicle body frame.

The above-mentioned flexible elastic plate member 2 provided in the engine mount IA prevents fluid pressure fluctuations in the first fluid chamber 21 caused by vibrations transmitted to the elastic buffer member 6 from occurring.
A through hole 31a provided in the weight member 31, a through hole 30a provided in the elastic member 30, and a large number of holes formed in the portion of the first metal plate member 24 that forms the plate member storage chamber 27. Although the vibration is supposed to act through the through hole 24c, the thickness, flexibility, etc. of the vibration are selected to reduce the vibration transmitted to the elastic shock absorbing member 6 at a medium frequency of, for example, 100 Hz or around 100 Hz. The first fluid chamber 21 deforms in response to fluid pressure fluctuations in the first fluid chamber 21 caused by vibrations in the range, thereby causing the first fluid chamber 21 to deform in response to fluid pressure fluctuations in the first fluid chamber 21 caused by vibrations in a moderate frequency range, typically at and around 100 Hz. It is said to absorb fluctuations in hydraulic pressure within the tank. Therefore, among the vibrations transmitted to the elastic buffer member 6, fluid pressure fluctuations in the first fluid chamber 21 due to vibrations in a medium frequency range of 100 Hz and its surroundings, for example, It is absorbed by the second deformation of the member, and the transmission to the vehicle body side bracket 4 through the partition wall member 19 and further through the cup-shaped member 9 is suppressed. As a result, among the vibrations transmitted to the elastic buffer member 6, for example,
Even vibrations in a medium frequency range of 100 Hz and its surroundings are suppressed from being transmitted to the vehicle body frame.

Further, the above-mentioned elastic member 30 and weight member 31 provided in the engine mount IA are selected with respect to their respective dimensions, weight, and elasticity of the elastic member 30, so that, for example, the displacement characteristics of the weight member 31 are selected. , the characteristic diagram shown in Figure 3 (horizontal axis: vibration frequency VF, vertical axis: displacement amount DA)
As shown in , the maximum amount of displacement is taken in response to vibrations with a frequency of approximately 150Hz, and the amount of displacement rapidly decreases as the frequency increases for vibrations with a frequency higher than approximately 150Hz. The vibration transmission characteristics including the elastic member 30 are shown in a characteristic diagram in FIG. 4 (horizontal axis: vibration frequency VF.

As shown in the vertical axis: Vibration Transmission Rate (BA), the maximum transmission rate is taken for vibrations with a frequency of approximately 150 Hz, and the transmission rate increases as the frequency increases for vibrations with a frequency higher than approximately 150 Hz. It is assumed that the value decreases rapidly with the As a result, in addition to the flexible elastic plate member 2, the elastic member 30 and the weight member 31 of the engine mount IA are
As shown in the characteristic diagram shown in Fig. 5 (horizontal axis: vibration frequency VF, vertical axis: vibration transmission rate BT), the vibration transmission characteristics when the The vibration transmission to the structure is significantly reduced compared to the case where the elastic member 30 and the weight member 31 shown by the dashed line are not provided.

By selecting the elastic member 30 and the weight member 31 in this way, among the vibrations transmitted to the elastic buffer member 6, vibrations in a medium or higher frequency range of about 150H2 or higher, for example, can be suppressed. Fluid pressure fluctuations in the first fluid chamber 21 are prevented from being transmitted by the elastic member 30 and the weight member 31, which have a reduced transmission rate for vibrations at frequencies higher than about 150 Hz. , the transmission to the vehicle body side bracket 4 via the partition wall member 19 and further the cup-shaped member 9 is suppressed. As a result, of the vibrations transmitted to the elastic buffer member 6, for example, about 150H
The transmission of vibrations to the vehicle body frame is also suppressed for vibrations in a frequency range of medium or higher, which is defined as z or higher.

As mentioned above, in the engine mount IA, among the vibrations transmitted to the elastic buffer member 6, for example, 10Hz
Regarding vibrations in a relatively low frequency range that is considered to be around the first liquid chamber 21 and the second liquid chamber 21 through the liquid communication passage 26,
The transmission of the liquid to the vehicle body frame is suppressed by the action of the liquid flow between the liquid chamber 22 and the liquid chamber 22.
Regarding vibrations in a medium frequency range of 0Hz and its surroundings, the action of the flexible elastic plate member 28 suppresses the transmission of the vibrations to the vehicle body frame.
Regarding vibrations in a frequency range of medium or higher, which is z or higher, the transmission of the vibrations to the vehicle body frame is suppressed by the action of the elastic member 30 and the weight member 31.

FIG. 6 shows a second example of a liquid-filled engine mount according to the present invention.

The liquid-filled engine mount IB shown in FIG. 6 has a first metal plate member 24 instead of the first metal plate member 24 forming the partition wall member 19 in the engine mount IA shown in FIG. ' is used, and the first
Elastic member 3 in engine mount) IA shown in the figure
0 and the weight member 31, a metal bellows 35 and a weight member 36 made of a metal plate such as an iron plate are used, and the other parts are configured in the same manner as the engine mount IA shown in FIG. Portions in FIG. 6 corresponding to those shown in FIG. 1 are given the same reference numerals as in FIG. 1, and redundant explanation thereof will be omitted.

The first metal plate member 24' is integrated with the second metal plate member 25 by having its flange portion 24a'' mutually coupled with the flange portion 25a of the second metal plate member 25, thereby forming the partition wall member 19. It consists of As shown in FIG. 7, the first metal plate member 24° has a liquid flow path 26 formed between the first metal plate member 24′ and the second metal plate member 25. A through hole 24b' is formed to communicate with the first liquid chamber 21, and the first metal plate member 24
"A plurality of through holes 24c are formed between the first liquid chamber 21 and the first liquid chamber 21 and are formed between the first liquid chamber 21 and the first liquid chamber 21." , are arranged in a ring.

The lower end of the metal bellows 35 is fixed to a portion of the upper surface of the first metal plate member 24'' that is inside the portion where the plurality of through holes 24c° are arranged annularly, and A weight member 36 is fixed, and the inside thereof is hollow, forming an elastic member that supports the weight member 36 on the first metal plate member 24'.The weight member 36 is, for example, It is assumed to form a disk.

The bellows 35 and the weight member 36 in the engine mount B are also the same as the engine mount I shown in FIG.
Similarly to the elastic member 30 and the weight member 31 in A, the respective dimensions, weight, elasticity, etc. of the bellows 35 are selected, and, for example, the displacement characteristics of the weight member 36 are shown in FIG. As shown in the characteristic diagram, the maximum amount of displacement is taken in response to vibrations with a frequency of approximately 150 Hz, and the amount of displacement rapidly decreases as the frequency increases for vibrations with frequencies higher than approximately 150 Hz. In addition, the vibration transmission characteristics including the bellows 35 are as shown in the characteristic diagram shown in FIG.
The maximum transmissibility is assumed for vibrations with a frequency of approximately 150 Hz, and the transmissibility for vibrations with a frequency higher than approximately 150 H2 is assumed to decrease rapidly as the frequency increases. Therefore, the same operation as the engine mount IA shown in FIG. 1 is performed in the engine mount IB, and the same operation and effect as the engine mount IA shown in FIG. 1 can be obtained.

FIG. 8 shows a third example of a liquid-filled engine mount according to the present invention.

The liquid-filled engine mount IC shown in FIG. 40 is used and the elastic member 30 in the engine mount) IA shown in FIG.
A metal bellows 41 and a weight member 42 are used in place of the weight member 31, and the other parts correspond to the engine mount IA shown in FIG. Components corresponding to those shown in the figure are given the same reference numerals as those in FIG. 1, and redundant explanation thereof will be omitted.

The first metal plate member 40 is integrated with the second metal plate member 25 by having its flange portion 40a interconnected with the flange portion 25a of the second metal plate member 25 to constitute the partition wall member 19. ing.

The first metal plate member 40 forms a liquid flow path 26 between it and the second metal plate member 25, and has a through hole 40b that communicates the liquid flow path 26 with the first liquid chamber 21. However, unlike the first metal plate member 24 in the engine mount IA shown in FIG. 1, it corresponds to the plate-like member storage chamber 27 in the engine mount IA shown in FIG. Furthermore, no through hole corresponding to the through hole 24C is provided.

Further, the metal bellows 41 has its lower end fixed to the upper surface of the first metal plate member 40 inside the part where the through hole 40b is provided, and the weight member 42 is attached to its upper end. The heavy member 42 is fixed to the first metal plate member 40 and has a hollow interior.
It forms an elastic member that supports the. The weight member 42 is
It is made up of a retaining part 43 attached to the upper end of the bellows 41 by closing it, and a plate-shaped member storage chamber forming part 44 supported by the retaining part 43. The plate-shaped member storage chamber forming part 44 has a case shape formed of a metal plate such as an iron plate provided with a large number of through holes 44a, and the flexible elastic plate member 28 is housed inside the case. There is. A large number of through holes 4 provided in the plate-shaped member storage chamber forming part 44
4a communicates the inside of the plate-shaped member storage chamber forming part 44 in which the flexible elastic plate member 28 is housed with the first liquid chamber 21, thereby making it possible to Fluid pressure fluctuations are made to act on the flexible elastic plate member 28 through the through hole 44a.

Even in the engine mount IC having such a configuration, the flexible elastic plate member 28 housed in the plate member storage chamber forming portion 44 is attached to the engine mount IA shown in FIG.
As in the case of , the thickness, flexibility, etc. are selected, and among the vibrations transmitted to the elastic shock absorbing member 6, for example,
Deforms in response to fluid pressure fluctuations in the first liquid chamber 21 caused by vibrations in a medium frequency range of 100 Hz and around 100 Hz, thereby causing vibration in a medium frequency range of 100 Hz and around 100 Hz. Fluctuations in fluid pressure within the first fluid chamber 21 caused by vibrations are absorbed.

Therefore, among the vibrations transmitted to the elastic buffer member 6, fluid pressure fluctuations in the first fluid chamber 21 due to vibrations in a medium frequency range, for example, 100)(Z) and its surroundings, are It is absorbed by the deformation of the flexible elastic plate member 28, and the transmission to the first metal plate member 40 is suppressed.

Further, the bellows 41 and the weight member 42 have the same dimensions as the elastic member 30 and the weight member 31 in the engine mount IA shown in FIG.

The weight, furthermore, the elasticity of the bellows 41, etc. are selected so that, for example, the displacement characteristics of the weight member 42 are adjusted to a frequency of about 15, as shown in the characteristic diagram shown in FIG.
The maximum amount of displacement is taken according to the vibration set to 0Hz, and the amount of displacement is assumed to decrease rapidly as the frequency increases for vibrations with a frequency higher than about 150Hz. The vibration transmission characteristics are the fourth
As shown in the characteristic diagram shown in the figure, the maximum transmissibility is taken for vibrations with a frequency of approximately 150 Hz, and the transmissibility increases as the frequency increases for vibrations with frequencies higher than approximately 150 Hz. This is expected to result in a rapid decline. Therefore, even in the engine mount IC,
The same operation as the engine mount LA shown in FIG. 1 is performed, and the same effects as the engine mount IA shown in FIG. 1 are obtained.

(Effects of the Invention) As is clear from the above description, the liquid-filled engine mount according to the present invention includes an elastic buffer member in which a liquid-sealed portion is provided, and the liquid-sealed portion is connected to the liquid by the partition member. In response to vibrations transmitted from the engine in a relatively low frequency range, the liquid in the liquid sealing portion is divided into at least first and second liquid chamber portions communicated by a passage. The fluid flows from one of the first and second fluid chamber portions to the other through the fluid communication passage in response to vibrations, thereby reducing fluid pressure changes in the fluid sealing portion caused by engine vibrations, and causing fluid to flow from the engine to the vehicle body. Transmitted vibrations are suppressed, and vibrations transmitted from the engine in a medium frequency range are mainly suppressed by a thin rubber plate disposed within the first liquid chamber portion. A flexible elastic plate member is provided to reduce fluid pressure changes caused by moderate frequency range vibrations from the engine in the first fluid chamber portion, and This suppresses the transmission of vibrations in the medium frequency range from the engine to the vehicle body, and furthermore, suppresses vibrations transmitted from the engine that are in the frequency range above the medium frequency range. The weight member and the elastic support member that supports it are arranged in the first liquid chamber part, and the weight member and the elastic support member that supports it support the M mounting member and the elastic support member that supports it.
Fluid pressure changes caused by vibrations in the medium frequency range or higher frequency range from the engine in the fluid chamber of the vehicle are reduced, thereby reducing the fluid pressure changes caused by vibrations in the medium frequency range or higher frequency range from the engine. transmission to is suppressed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first example of a liquid-filled engine mount according to the present invention, FIG. 2 is a view showing main parts of the example shown in FIG. 1, and FIGS. FIG. 1 is a characteristic diagram for explaining the operation of the example shown in FIG. 6, a sectional view showing a second example of the liquid-filled engine mount according to the present invention, and FIG. FIG. 8 is a sectional view showing a third example of a liquid-filled engine mount according to the present invention. In the figure, IA, IB, and IC are engine mounts, 6 is an elastic buffer member, 7 is a mounting plate part, 8 is an annular member, 9 is a cup-shaped member, 18 is a diaphragm member, 19 is a partition member, 2
1 is the first space (first liquid chamber), 22 is the second space (second liquid chamber), 23 is the third space, 24.24'' and 40 are the first metal plate member, 25 is a second metal plate member,
26 is an annular space (liquid connection path), 27 is a plate-like member storage chamber, 28 is a flexible elastic plate member, 30 is an elastic member, 3
1. 36 and 42 are weight members, 35 and 41 are bellows, and 44 is a plate-shaped member storage chamber forming part. Figure 3 Figure 4 (Hz) 41; Bellows 42 - Weight member

Claims (1)

[Scope of Claims] 1. An engine connecting portion to which an engine is attached; a vehicle body connecting portion to which the engine is mounted; a vehicle body connecting portion disposed between the engine connecting portion and the vehicle body connecting portion;
an elastic buffer member having a liquid sealing part therein; dividing the liquid sealing part into a first liquid chamber part and a second liquid chamber part located below the first liquid chamber part;
a partition member provided with a liquid communication path that allows liquid to flow between the first liquid chamber portion and the second liquid chamber portion in response to vibrations in a relatively low first frequency range of the engine; , a flexible elastic plate member disposed within the first liquid chamber portion and suppressing changes in fluid pressure caused by vibrations in a second frequency range higher than the first frequency range of the engine; A weight that is supported by the partition wall member via an elastic support member in the liquid chamber portion and suppresses transmission of fluid pressure changes caused by vibrations in a third frequency range that is equal to or higher than the second frequency range of the engine. A liquid-filled engine mount consisting of a member and. 2. The liquid-filled engine mount according to claim 1, wherein the weight member is attached to the partition member via a bellows member within the first liquid chamber.