JP2525878Y2 - Liquid-filled anti-vibration mount - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled anti-vibration mount used to support a vibration generator such as an engine of an automobile in a vibration-proof manner.

[0002]

2. Description of the Related Art Vibration damping is carried by a liquid sealed in a variable-volume chamber, while vibration insulation is carried by a vibration-insulating base made of a rubber elastic material forming a chamber wall for liquid sealing. A liquid-filled anti-vibration mount having a large damping coefficient for low-frequency vibrations and a property of having high insulation properties for high-frequency vibrations has been conventionally known, for example, disclosed in JP-A-61-45130. I have.

In such a vibration-proof mount, a liquid-proof chamber is formed by attaching a vibration-proof base made of a rubber elastic body to an upper opening of a cylindrical main body fitting and a diaphragm in a sealed state at a lower opening. The liquid chamber is divided by a partition plate having an orifice, and a structure is formed in which an air chamber is formed between a diaphragm and a lower end of the main body by attaching a bowl-shaped mounting member. I have. Bolts for mounting the engine or the vehicle body are provided on the vibration isolating base and the mounting bracket so as to protrude vertically, respectively, and those of the vibration isolating base are provided with a large contact area and embedded in the vibration isolating base. On the other hand, the mounting bracket is fixed to the bottom of the air chamber by welding usually from the air chamber side.

[0004]

[Problem to be solved by the invention] By the way, in recent years,
A supported object such as an engine tends to be large, and when the weight of the supported object increases, a strong tightening force of the bolt is required. In order to increase the axial force of the bolt, it is conceivable to use a high tension bolt. In this case, however, in particular, in the above-described mounting bracket, there is a possibility that a delamination may occur when welding with the high tension bolt.

[0005] In order to solve this problem, a method of press-fitting a bolt having a serration below the head into a hole provided in the mounting bracket so as to correspond to the serration of the bolt has been adopted. According to this, the mounting of the bolt to the mounting bracket can be strengthened. However, in the vibration-proof mount in which the bolt is press-fitted, the airtightness of the air chamber formed by the mounting bracket and the diaphragm cannot be maintained, and the air spring of the air chamber cannot be used. Cannot be secured, and the spring characteristic is deteriorated particularly in a high frequency range (100 Hz or more).

[0006] The present invention addresses the above-described situation, and in particular, by finding a new structure in the air chamber, ensures a predetermined spring constant even in a mount in which the bolt tightening force is secured as described above. An object is to reduce the absolute spring constant of a mount in a high frequency range.

[0007]

That is, the liquid-filled anti-vibration mount of the present invention which meets the above-mentioned object is characterized in that a vibration-proof base made of a rubber elastic body is provided in an upper opening of a cylindrical main body fitting, and a lower opening is provided. Each of the diaphragms made of a rubber film is attached in a sealed state to form a liquid chamber, and the liquid chamber is divided by providing an orifice with a partition plate, and a bowl-shaped mounting is provided at the lower end of the main body fitting. In a liquid-filled anti-vibration mount with metal fittings attached, bolts are serrated into the above fittings.
In this case, a partition member, which is fixed through when necessary, and forms an air chamber below the diaphragm in an airtight state, is inserted and fixed between the diaphragm and the mounting bracket.

[0008]

In the anti-vibration mount of the present invention having the above structure, the partition member provided between the diaphragm and the mounting bracket forms the air chamber below the diaphragm in an airtight state, so that the mounting bracket is airtight. It is possible to secure a predetermined spring constant even in a mount with a high axial force that lacks the property, and to reduce the absolute spring constant of the mount in a high frequency range.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a liquid-filled anti-vibration mount according to an embodiment of the present invention.

FIG. 1 is a cross-sectional view showing a mount according to an embodiment. This mount has a rubber main body (1) made of a rubber elastic body and has a bolt (2) with an anchor plate at an upper opening of the main body (1). While vulcanizing and bonding the vibration base (3),
A liquid chamber (5) is formed by attaching a diaphragm (4) made of a rubber film to the lower opening of the main body fitting (1) in a sealed state. The orifice (6) is separated from the orifice (6) by a partition plate (7) which has a dish shape and has an orifice (6) formed by a peripheral portion thereof and a part of the vibration-proof base (3). It is divided into a main liquid chamber (9) and a sub liquid chamber (10) communicating through the communication hole (8) of (7). A bowl-shaped mounting bracket (11) is provided at the lower end of the main body bracket (1).
Is attached by caulking the lower end of the body fitting (1).

On the other hand, in this mount, a high tension bolt (13) having a serration (12) below its head is provided in a mounting bracket (11) in order to secure a tightening force with a mounting portion of a vehicle body or an engine. The mounting bracket (11) is press-fitted into the hole of the mounting bracket (11) drilled to cope with the serration of the bolt, and the present invention covers the airtightness of the mounting bracket (11) lost by the serration fitting. The fitting (11) and the diaphragm (4)
Between the air chamber (1) in an airtight state below the diaphragm.
A cover fitting (15) is provided as a partition member for forming 4). The cover fitting (15) has a bowl shape in this embodiment, and a gap (17) is formed below the cover fitting (15) to prevent interference with the head of the bolt (13) or the positioning pin (16). I have. A ring-shaped fitting (18) in which a rubber film (4a) of a diaphragm (4) is vulcanized and bonded.
Is a metal contact (rigid body) between the body fitting (1) and the mounting fitting (11) without a lip-shaped rubber (19) described later together with a partition plate (7) flange and a cover fitting (15) flange. The cover metal (15) is caulked and fixed integrally in this state, and the caulking strength is secured at this portion. A lip-shaped rubber (1) is provided on both sides of the ring-shaped metal fitting (18) of the diaphragm over the entire circumference, facing the respective R portions of the partition plate (7) and the cover metal fitting (15).
9) is to maintain the airtightness of the liquid chamber (5) and the air chamber (14) together with the lip-shaped rubber (20) provided facing the partition plate (7) of the vibration-proof base (3). It is provided separately from the above-described caulking portion except for the presser allowance. That is, with these configurations, the cover fitting (15)
Can simultaneously achieve the required properties in terms of the sealing function and strength as a partition member.

The cover fitting (15) is not necessarily required to have a bowl shape as long as the capacity of the air chamber (14) has a sufficient capacity. The thickness of the cover fitting (15) is also optional. As shown in FIG. 2, the positioning pin (16) may be welded to the cover fitting (15).

The anti-vibration mount of the embodiment of the present invention having the above-described structure is formed by press-fitting a bolt having a high axial force into the mounting bracket by serration fitting, so that a strong tightening force is applied to the vehicle body or the engine mounting portion. Since it is possible to attach and the air chamber is kept airtight as described above,
It is possible to effectively reduce the absolute spring constant in the high frequency range of 100 Hz or more, and to maintain the airtightness of the air chamber by a simple structure in which the cover is inserted and fixed between the diaphragm and the mounting. Therefore, there is also an effect that the anti-vibration mount can be manufactured at low cost.

Although the anti-vibration mount according to the embodiment of the present invention has been described above, the bolts of the mount fittings are not limited to press-fitting, but may be welded, and the cover fitting (15) is made of synthetic resin or the like. It is also possible.

[0015]

[Effects of the Invention] As described above, the liquid-filled anti-vibration mount of the present invention has serrated bolts in the bowl-shaped mounting bracket.
Attached and fixed by fitting , between the mounting bracket and the diaphragm attached to the lower end of the cylindrical main body fitting, a partition member that airtightly forms an air chamber below the diaphragm is inserted and fixed, Since the partition member forms an air chamber in an airtight state below the diaphragm, a predetermined spring constant is ensured even in a high axial force mount that lacks airtightness in the mounting bracket, and an absolute spring in a high frequency range of 100 Hz or more is provided. The constant can be effectively reduced, and the airtightness of the air chamber is maintained by a simple configuration in which a partition member is inserted and fixed between the diaphragm and the mounting bracket. Another advantage is that the manufacturing can be performed at low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a liquid-filled anti-vibration mount according to an embodiment of the present invention.

FIG. 2 is a partial sectional view showing another example of the cover fitting of the embodiment of the present invention.

[Explanation of symbols]

 (1) Body bracket (2) Bolt with anchor plate (3) Vibration-proof base (4) Diaphragm (5) Liquid chamber (6) Orifice (7) Partition plate (8) Communication hole (9) Main liquid chamber (10) Sub liquid chamber (11) Mounting bracket (12) Serration (13) High tension bolt (14) Air chamber (15) Cover bracket (partition member) (16) Positioning pin (17) Gap (18) Ring-shaped bracket (19) Lip rubber (20) Lip rubber

Continuing on the front page (72) Inventor Yukio Takashima Ichigoyama, Niyoshika-cho, Aichi Pref. Uchikoshi character Ikayama No. 3 Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center (56) References JP-A-4-92139 (JP, A) JP-A-61-45130 (JP, A) JP-A-3-103636 (JP, A) JP-A 63-115943 (JP, U) JP-A 4-114145 (JP, U) JP-B-59-40613 (JP, B2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A liquid chamber is formed by attaching a vibration-isolating base made of a rubber elastic body to an upper opening of a cylindrical main body fitting and a diaphragm made of a rubber film to a lower opening in a sealed state, respectively. the liquid chamber is divided by an orifice provided in the partition plate, and, in the hydraulic antivibration mounts tighten dressed preparative bowl-shaped mounting bracket to the lower end of the main body bracket, the mounting bracket
When the bolt is fixed to the
To, the partition member forming an air chamber in an airtight state to the diaphragm downward, the hydraulic antivibration mount is characterized in that allowed inserted and fixed between the diaphragm and the mounting bracket.