JPH0647146Y2 - Liquid-filled mount - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a liquid-filled mount, and in particular, it is possible to prevent reduction of a spring constant in a tension direction and to improve a bulging spring in a compression direction. The present invention relates to a liquid-filled mount that can be used.

[Prior art and problems to be solved]

Conventionally, in order to prevent the vibration from a vibration source such as an internal combustion engine from being transmitted to an external member that supports the vibration as much as possible, a liquid is enclosed inside and a liquid-filled mount is used to damp the vibration from the vibration source. A liquid-filled mount for damping such vibrations is shown in FIGS. 4 and 5.

That is, the liquid-filled mount shown in FIGS. 4 and 5 includes a main body portion 22 having a screw portion 21 that receives vibration from a vibration source such as an internal combustion engine (not shown), the main body portion 22 and the casing 32. Between the two elastic members 24 having different elastic moduli (spring constants) K ₁ and K ₂ via a connecting plate 23.
an elastic body 24 formed by connecting a and 24b, and an orifice plate 25 that is disposed so as to face the inner wall surface of the cavity provided at the center of the elastic body 24 and has a plurality of holes 25a formed in the upper surface. ,
A first chamber 26 formed between the orifice plate 25 and the elastic body 24, and a spiral groove 27a located inside the orifice plate 25 and provided on the peripheral surface are provided between the orifice plate 25 and the orifice plate 25. A disk-shaped orifice body 27 having an orifice 31 opening on the upper surface of the orifice plate 25 and having a plurality of holes 27a facing the plurality of holes 25a of the orifice plate 25, and the orifice plate 25.
Of the auxiliary diaphragm 28 located in the space between the upper surface of the disk-shaped orifice body 27 and the upper surface of the disk-shaped orifice body 27, and the main diaphragm 29 arranged to face the bottom surface of the disk-shaped orifice body 27.
The main diaphragm 29 and the disk-shaped orifice body 27.
And the first through the orifice 31
The first chamber 26 is formed by a second chamber 30 communicating with the chamber 26.
A liquid is sealed inside the second chamber 30.

Then, regarding the operation of the conventional liquid-filled mount configured as described above, first, when vibration from a vibration source such as an internal combustion engine is input to the main body portion 22 via the screw portion 21,
The vibration is received by the elastic body 24 and attenuated, and the elastic body 24 is pushed downward, and when the input vibration has a low frequency, the first chamber 26 is contracted.

Therefore, the liquid inside the first chamber 26 is pushed downward, flows into the spiral orifice 31 through the hole of the orifice plate 25, flows inside the orifice 31 and flows into the second chamber 30. It is supposed to flow in.

Therefore, the volume inside the second chamber 30 is increased by being combined with the liquid filled in the inside of the second chamber 30, thereby pushing down the main diaphragm 29, and thus increasing the volume. The liquid inside the second chamber 30 again flows into the inside of the first chamber 26 through the orifice 31, and such a process is repeated.

Then, as described above, the vibration from the vibration source is damped by the resistance when the liquid flows through the orifice 31 between the first chamber 26 and the second chamber 30.

When the input vibration is at a high frequency, the liquid in the first chamber 26 is filled with the auxiliary diaphragm 28 located in the space between the upper surface of the orifice plate 25 and the upper surface of the disk-shaped orifice body 27. , This auxiliary diaphragm pushed through 27a
28 is moved and deformed with a slight gap to dampen the vibration.

However, in the conventional liquid-filled mount configured as described above, the relationship between the frequency and the dynamic spring constant, that is, the dynamic characteristic is as shown in FIG. The relationship, that is, the static characteristic, is as shown in FIG.

Therefore, there is a problem in that both the dynamic characteristics and static characteristics on the tensile side are lower than those on the compression side, and it is not possible to obtain integrated characteristics in a wide range.

Further, as shown in FIG. 6, the elastic material of the elastic body 24 is compressed.
24b swells, and the bulging spring at this time causes the liquid enclosed in the first chamber 26 to flow into the second chamber 30, but at the time of this compression, the elastic material 24b inevitably escapes as shown by the broken line, and a large There is a problem in that a bulging spring cannot be obtained and therefore a large damping cannot be obtained.

This invention solves the problems of the conventional ones described above, and prevents the decrease of the spring constant in the tension direction and improves the expansion spring in the compression direction. It is intended to provide an encapsulated mount.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention comprises a main body portion that receives a vibration input of a vibration source, two elastic members that connect the main body portion and the casing, and are connected via a connecting plate, And, one elastic material is in the main body,
Further, the other elastic member is attached to the casing respectively, an elastic member, a partition member having an orifice attached to the casing so as to close a central space of the elastic member, and a partition member provided below the partition member. And a protector that is engageable with the connecting plate provided in the casing and that the other elastic member can abut, and a first chamber is provided between the elastic body and the partition member.
A liquid-filled mount in which a second chamber is formed between the partition member and the diaphragm and a liquid is sealed inside, and the protector is provided when the elastic body is compressed via the main body. The other elastic member is prevented from expanding outward, and when the elastic member is pulled, the protector engages with the connecting plate to pull only the one elastic member. ing.

A protrusion is provided inside the protector so that when the elastic body is compressed, the other elastic member comes into contact with the protrusion and is prevented from further bulging outward. There is.

[Action]

By adopting the above means, this invention prevents the other elastic material from bulging outward by the protector when the elastic body on which the vibration acts acts on the compression side.
On the pulling side, the connecting plate constituting the elastic body engages with the protector so that only one elastic member acts.

〔Example〕

 An embodiment of the present invention shown in the drawings will be described below.

1 and 2 show a liquid-filled mount according to the present invention.

That is, this liquid-filled mount connects the main body 2 having a screw portion 1 that receives vibration from a vibration source such as an internal combustion engine (not shown), the main body 2 and the casing 12, and An annular elastic body 4 formed by connecting two elastic materials 4a and 4b having different elastic moduli (spring constants) K ₁ and K ₂ through a plate 3 and a space provided at the center of the elastic body 4 It has an orifice plate 5 facing the inner wall surface and having a plurality of holes 5a formed in the upper surface, and a first chamber 6 is formed between the orifice plate 5 and the elastic body 4. .

Inside the orifice plate 5, a spiral groove 7a is provided on the peripheral surface to form an orifice 11 opening to the upper surface of the orifice plate 5 between the orifice plate 5 and the orifice plate 5, and A disk-shaped orifice body 7 having a plurality of holes 5a and a plurality of holes 7b facing each other is provided, and a partition member 14 is formed by the orifice plate 5 and the disk-shaped orifice body 7.

An auxiliary diaphragm 8 is provided in the space between the orifice plate 5 and the disk-shaped orifice body 7, and a main diaphragm 9 is provided so as to face the bottom surface of the disk-shaped orifice body 7. This main diaphragm 9
A second chamber 10 is formed between the first chamber 6 and the disk-shaped orifice body 7, and the second chamber 10 and the first chamber 6 are communicated with each other via the orifice 11, Second
A liquid is sealed inside the chamber 10.

On the other hand, a lower end of a protector 13 whose upper end covers the upper side of the connecting plate 3 of the elastic body 4 is attached to the casing 12, and the upper end of the protector 13 is attached to the elastic body. The protrusion 13a is provided on the upper side of the connecting plate 3 of No. 4 and is adjacent to the elastic member 4b inside.

Next, the operation of the liquid-filled mount configured as described above will be described.

First, when vibration from a vibration source such as an internal combustion engine is input to the main body 2 via the screw portion 1, the vibration is received by the elastic body 4 and attenuated, and the elastic body 4 is pushed downward and input. When the vibration has a low frequency, the first chamber 6 is contracted.

Therefore, the liquid inside the first chamber 6 is pushed downward, flows into the inside of the spiral orifice 11 through the hole of the orifice plate 5, flows through the inside of the orifice 11 and flows into the second chamber 10. It is supposed to flow in.

Therefore, the volume inside the second chamber 10 is increased by being combined with the liquid filled in the inside of the second chamber 10, thereby pushing down the main diaphragm 9 and thus increasing the volume. The liquid inside the second chamber 10 again flows into the inside of the first chamber 6 through the orifice 11, and this is repeated.

Then, as described above, the vibration from the vibration source is damped by the resistance when the liquid flows through the orifice 11 between the first chamber 6 and the second chamber 10.

When the input vibration is at a high frequency, the liquid in the first chamber 6 is filled with the holes 5a by the auxiliary diaphragm 8 located in the space between the upper surface of the orifice plate 5 and the upper surface of the disk-shaped orifice body 7. , 7a to push this auxiliary diaphragm 8
Is moved and deformed with a small gap to damp vibrations.

The elastic body 4 is compressed or pulled during the above-mentioned operation.

That is, the two elastic members connected by the connecting plate forming the elastic body are deformed as follows.

First, on the compression side, the connecting plate 3 that connects the two elastic members 4a and 4b is separated from the protector 13, and the elastic member 4b is outward as shown by the chain line in FIG. The protrusion 13a provided on the inside of the protector 13 prevents the swelling and escape from the swelling spring, so that the swelling spring rises, whereby the elastic material (spring constant) has an elastic material of K ₁ and an elastic material 4a of K ₂ , 4b acts as a series spring K ₁ + K ₂ to obtain a large damping.

On the compression side, by being restrained by the protector 13, the spring constant rises during the compression, so the displacement is reduced, and the durability is improved.

On the other hand, on the tension side, the connecting plate 3 is the protector.
It engages with the upper end of 13, so that only the elastic member 4b having the elastic modulus (spring constant) of K ₁ acts, not the series spring of the elastic members 4a and 4b, and thereby almost the same as the compression side. The spring constant of can be obtained.

Therefore, according to the present invention, the expansion spring is improved on the compression side to obtain a large damping, and the spring constant is prevented from decreasing on the tension side, so that the spring constant almost equal to that on the compression side can be obtained. It is a thing.

As the protector 13, various materials such as hard rubber, metal and plastic can be used.
Regarding attachment to the casing 12, various means such as screwing, rivets, welding, etc. can be adopted.

[Effect of device]

According to the present invention having the above-mentioned configuration, it is possible to prevent a part of the elastic member from bulging outward at the time of compression, and it is possible to raise the bulging spring, whereby large damping can be obtained.

In addition, the two elastic members do not act as a series spring when tensioned, but only one elastic member acts, so that a spring constant almost equal to that during compression can be obtained.

Therefore, by the above, there is an excellent effect that certain characteristics can be obtained in a wide range during compression and tension.

[Brief description of drawings]

1 to 3 show a liquid-filled mount according to the present invention, FIG. 1 is a plan view, FIG. 2 is a schematic vertical sectional view, FIG. 3 is an enlarged view of a main part, and FIGS. FIG. 4 shows a conventional liquid-filled mount, FIG. 4 is a plan view, FIG. 5 is a schematic vertical cross-sectional view, FIG. 6 is an enlarged view of essential parts, and FIG. 7 is a view showing conventional dynamic characteristics. FIG. 8 is a diagram showing conventional static characteristics. 1, 21 ...... Screw part 2, 22 ...... Main body part 3, 23 ...... Connecting plate 4, 24 ...... Elastic body 4a, 4b, 24a, 24b ...... Elastic material 5, 25 ...... Orifice plate 5a, 7b, 25a, 27a ... Hole 6,26 ... First chamber 7,27 ... Disc-shaped orifice body 7a, 27a ... Groove 8,28 ... Auxiliary diaphragm 9,29 ... Main diaphragm 10,30. 2 chambers 11, 31 …… Orifice 12,32 …… Casing 13 …… Protector 13a …… Projection

Claims (2)

[Scope of utility model registration request] 1. A main body (2) which receives a vibration input from a vibration source, and two main body (2) and a casing (12) which are connected to each other via a connecting plate (3). Made of elastic material (4a) (4b) and one elastic material (4
a) is the main body (2), and the other elastic material (4b)
Are attached to the casing (12), respectively, and an orifice (1) attached to the casing (12) so as to close a void in the center of the elastic body (4).
A partition member (14) having 1), a diaphragm (9) provided below the partition member (14), and a connecting plate (3) provided in the casing (12) can be engaged with each other. , A protector (13) with which the other elastic member (4b) can come into contact, the first chamber (6) between the elastic body (4) and the partition member (14), and the partition member. A liquid-filled mount in which a second chamber (10) is formed between a diaphragm (9) and a diaphragm (9) and a liquid is sealed inside, and the elastic body (2) is provided via the body (2). When the protector (13) is compressed, the protector (13) prevents the other elastic member (4b) from expanding outward, and when the elastic body (4) is pulled, the protector (13) )
Is engaged with the connecting plate (3) and only the elastic member (4a) on one side is pulled, and a liquid-filled mount. 2. A protrusion (13a) is provided inside the protector (13), and when the elastic body (4) is compressed, the other elastic material (4b) is attached to the protrusion (13a). The liquid-filled mount according to claim 1, wherein the liquid-filled mount is prevented from coming into contact with the mount and further bulging outward.