JPH0678645U - Liquid-filled anti-vibration device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a liquid filled type vibration damping device which has excellent durability and can be used with a large mounting inclination angle. [Structure] An upper end opening of a first fixture 1 and a support surface 33 of a tubular member 3 are formed to be inclined with respect to an attachment plane P of a vehicle body frame F (inclination angle 15 °). As a result, the mounting plane P of the body frame F having a large inclination angle (inclination angle 45
Even when mounted on the mounting plane P having an inclination angle of 30 °, the main body rubber portion 4 supported by the supporting surface 33 of the tubular member 3 can be brought into the same state as when mounted on the mounting plane P. The distortion rate of the main body rubber portion 4 becomes small, and the durability becomes good.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid filled type vibration damping device used as, for example, an engine mount or strut mount of an automobile.

[0002]

[Prior art]

 An automobile engine is mounted on the vehicle body through an engine mount having anti-vibration characteristics. As this engine mount, there is known a liquid-sealing type vibration damping device shown in FIG. 2 in which vibration is effectively damped by the elastic action of a rubber elastic body and the liquid column resonance action of an incompressible liquid body. This liquid-filled type vibration damping device has an air chamber 12a whose upper end is open and a lower end which is attached to the vehicle body frame F as an attachment surface, a second attachment 2a which is attached to the engine E, and a second attachment 2a. A tubular member 3a having a support surface 33a that is connected to the lower end of the first mounting tool 1a and has an inner diameter that expands upward; and a support surface 33a of the tubular member 3a and the second mounting tool 2a. Is installed between the tubular member 3a and the first fixture 1a, and the main body gum portion 4a that is mounted on the tubular member 3a to close the upper portion thereof and forms the liquid chamber 45a together with the tubular member 3a. A diaphragm 5a for partitioning the chamber 12a and the liquid chamber 45a, a partition member 6a for partitioning the liquid chamber 45a into a main liquid chamber 46a and a sub liquid chamber 47a, and a liquid L enclosed in the liquid chamber 45a are provided. This liquid-filled type vibration damping device is preferably used with a small mounting inclination angle of the mounting plane P of the vehicle body frame F of 35 ° or less.

On the other hand, a liquid-filled type vibration damping device shown in FIG. 3 is known as a liquid-filled type vibration damping device which is used at a large mounting tilt angle where the tilt angle α of the mounting plane P of the vehicle body frame F is 35 ° or more. This liquid-filled type vibration damping device has the same basic structure as that of the liquid-filled type vibration damping device shown in FIG. 2 except that it is provided between the inner peripheral surface of the second fixture 2b and the outer peripheral surface of the tubular member 3b. The auxiliary rubber portion 7b is provided at a position on the upper side at the time of mounting, and the auxiliary rubber portion 7b reinforces the supporting force for the downward engine load which increases as the inclination angle increases. Further, in the case of this liquid-filled type vibration damping device, the main body rubber portion 4b interposed between the support surface 33b of the tubular member 3b and the second mounting member 2b forms the side wall of the liquid chamber 45b. An intermediate plate 8b is provided on the side wall thereof so as to prevent the main body rubber portion 4b from bulging and deforming outward when downward vibration is applied.

[0004]

[Problems to be solved by the device]

 By the way, in order to reduce the acceleration noise and muffled noise in the liquid-filled type vibration damping device as described above, the spring constants of the rubber portions 4a and 4b of the main body are set so as to effectively damp vibrations with a frequency of 200 Hz or less. Is set. However, in the liquid-filled type vibration damping device shown in FIG. 3 which is used at a large mounting inclination angle, the resonance of the second mounting tool 2b occurs from around 200 Hz because the structure of the second mounting tool 2b is complicated. However, there is a problem that the acceleration noise and muffled noise cannot be satisfactorily reduced because resonance due to the mass weight of the intermediate plate 8b occurs near 120 Hz.

On the other hand, in the case of the structure of the liquid-filled type vibration damping device shown in FIG. 2 which is used at a small mounting inclination angle, the resonance of the second fitting 2a does not occur up to 500 Hz, but this liquid-filled type vibration damping device is large. If it is used at a mounting inclination angle, the distortion rate of the main body rubber portion 4a becomes large, and there is a problem that durability becomes poor. Therefore, even in the structure of this liquid-filled type vibration damping device, if the size in the radial direction is increased to about 1.5 times (for example, 100 mm to 150 mm in diameter), the distortion rate of the main body rubber portion 4a is reduced and durability is secured. However, it is not practical because it leads to high cost and weight.

The present invention has been devised in view of the above problems, and a problem to be solved is to provide a liquid filled type vibration damping device which has excellent durability and can be used at a large mounting inclination angle. .

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a first fixture that forms an air chamber having an open upper end and a lower end that is attached to a base as an attachment surface, a second fixture that is attached to a mounting member, and the first attachment. A tubular member having a lower end connected to the fixture and having a support surface on the inner circumference of which the diameter increases upward, and the tubular member interposed between the support face of the tubular member and the second fixture. The main body rubber portion that closes the upper portion of the cylindrical member and forms a liquid chamber together with the tubular member, and is disposed between the tubular member and the first mounting member to provide the liquid chamber and the air. In a liquid-filled type vibration damping device comprising a diaphragm partitioning a chamber and a liquid sealed in the liquid chamber, the upper end opening of the first fitting and the supporting surface of the tubular member are The structure adopted is that it is inclined with respect to the mounting plane of the table.

[0008]

[Action]

 In the liquid filled type vibration damping device of the present invention, the upper end opening of the first mounting member and the supporting surface of the tubular member are formed to be inclined with respect to the mounting surface of the base. As a result, even when it is mounted on the mounting plane of the base with a large inclination angle, the body rubber part supported by the supporting surface of the tubular member corresponds to the angle at which the supporting surface is inclined with respect to the mounting plane. , It can be in the same state as when mounted on a mounting plane with a small inclination angle. Therefore, the distortion rate of the main body rubber portion becomes small, and the durability becomes good.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a mounted state of the liquid filled type vibration damping device according to the present embodiment. The liquid-filled type vibration damping device of the present embodiment is used as an engine mount of an automobile, and includes a first mounting tool 1 mounted on a vehicle body frame F, a second mounting tool 2 mounted on an engine E, and A tubular member 3 having a lower end coupled to the first fixture and having a support surface 33 on the inner periphery, and a tubular member 3 interposed between the support face 33 of the tubular member 3 and the second fixture 2 together with the tubular member 3. The main body rubber portion 4 forming the liquid chamber 45, the diaphragm 5 arranged between the tubular member 3 and the first fitting 1, and the liquid chamber 45 are partitioned into a main liquid chamber 46 and a sub liquid chamber 47. The partition member 6 and the liquid L sealed in the liquid chamber 45 are main elements.

The first fixture 1 is of a bottomed cylindrical shape having a flange portion 11 at the upper end periphery and an open upper end, and an air chamber 12 is formed therein. The bottom wall 13 serving as a mounting surface to the vehicle body frame F is formed with an inclination of 15 ° with respect to a plane perpendicular to the axis of the first mounting tool 1. A bolt 14 projecting outward is fitted and fixed to the bottom wall 13, and the first attachment 1 is attached to the attachment plane P of the vehicle body frame F via the bolt 14. The inclination angle α of the mounting plane P here is 45 °. The air chamber 12 communicates with the outside through a through hole (not shown) formed in the bottom wall 13.

The second mounting member 2 is a dish-shaped member having a flat surface portion 21 arranged in the central portion thereof substantially parallel to the bottom wall 13 of the first mounting member 1. A bolt 22 for mounting the second mounting member 2 on the engine E is fitted and fixed at approximately the center of the plane portion 21, and a positioning pin 23 for positioning is provided on the upper surface side adjacent to the bolt 22. The tubular member 3 has an enlarged diameter portion 31 formed on the upper end side so as to increase in diameter as it goes upward, and a connecting portion 32 formed by crimping the lower end portion and having a U-shaped cross section. It has a cylindrical shape. A support surface 33 is formed on the inner peripheral surface of the expanded diameter portion 31 to mainly support the main body rubber portion 4. The support surface 33 is formed as a tapered surface that forms an angle of 45 ° with the axis of the tubular member 3. The tubular member 3 is connected to the first mounting tool 1 in the same axial shape by holding the flange portion 11 of the first mounting tool 1 between the coupling parts 32 when the coupling part 32 is caulked. As a result, the tubular member 3 is arranged such that the plane orthogonal to the axis of the tubular member 3 is inclined at an angle of 15 ° with respect to the bottom wall 13 of the first fixture 1 and the plane portion 21 of the second fixture 2. Therefore, the entire support surface 33 of the tubular member 3 and the upper end opening of the first fixture 1 are inclined by 30 ° with respect to the horizontal plane. An appropriate space is formed between the upper end of the expanded diameter portion 31 and the lower surface of the second fixture 2.

The main body rubber portion 4 is interposed by vulcanization adhesion between the inner peripheral surface including the support surface 33 of the tubular member 3 and the lower surface of the second mounting tool 2. The body rubber portion 4 closes the upper portion of the tubular member 3 to form a liquid chamber 45 together with the tubular member 3. The diaphragm 5 is formed of a hat-shaped elastically deformable rubber thin film. The diaphragm 5 is fixed at its peripheral edge in a liquid-tight manner by being fixed in a liquid-tight manner between the inner surface of the connecting portion 32 of the tubular member 3 and the inner surface of the flange portion 11 of the first fixture 1. And the air chamber 12 are divided. The liquid chamber 45 is filled with a liquid L made of an incompressible fluid such as water, alkylene glycol, or silicone oil.

The partition member 6 includes a hat-shaped first member 61, a hat-shaped second member 62 formed by stacking a ring-shaped storage space 63 in a central portion below the first member 61, and a storage member. The movable plate 64 is housed in the space 63 so as to be movable in its thickness direction, and is formed in a disk shape as a whole. The partition member 6 has its peripheral portion sandwiched and fixed by the diaphragm 5 and the lower end portion of the main body rubber portion 4 extending below the inner peripheral surface of the tubular member 3, and the liquid chamber 45 is fixed by the main body rubber portion. It is partitioned into a main liquid chamber 46 on the fourth side and a sub liquid chamber 47 on the diaphragm 5 side. An orifice 65 that connects the main liquid chamber 46 and the sub liquid chamber 47 is formed in the center of the partition member 6. The first member 61 and the second member 62 are formed with a large number of action holes (not shown) that connect the storage space 63 to the main liquid chamber 46 and the sub liquid chamber 47, respectively.

The liquid filled type vibration damping device of the present embodiment configured as described above is mounted on the mounting plane P (inclination angle α is 45 °) of the vehicle body frame F having a large mounting inclination angle. Also, since the upper end opening of the first fixture 1 and the support surface 33 of the tubular member 3 are formed inclined by 15 ° with respect to the attachment plane P, the main body rubber portion 4 supported by the support surface 33 is The same state as when the liquid filled type vibration damping device is mounted on the mounting plane P having an inclination angle of 30 °. As a result, the distortion rate of the main rubber portion 4 becomes small, and the durability becomes good.

Therefore, according to the liquid-filled type vibration damping device of the present embodiment, since the distortion rate of the main body rubber portion 4 can be reduced, the durability is excellent, so that it can be used at a large mounting inclination angle. .

[0016]

EFFECTS OF THE INVENTION In the liquid-filled type vibration damping device of the present invention, since the upper end opening of the first mounting member and the supporting surface of the tubular member are formed to be inclined with respect to the mounting plane of the base, a large mounting is possible. Even when used at a tilt angle, the distortion rate of the rubber part of the main unit is small and it has excellent durability, so it can be used at a large mounting tilt angle.

Further, by appropriately setting the inclination angles of the upper end opening of the first attachment and the support surface of the tubular member with respect to the attachment plane of the base, the spring of the main rubber portion can be changed without changing the attachment angle of the engine or the like. The ratio can be freely tuned.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mounted state of a liquid filled type vibration damping device according to an embodiment.

FIG. 2 is a cross-sectional view showing a mounted state of a conventional liquid-filled type vibration damping device.

FIG. 3 is a cross-sectional view showing a mounting state of another conventional liquid-filled type vibration damping device.

[Explanation of symbols]

1 ... 1st attachment 2 ... 2nd attachment 3 ... Cylindrical member
4 ... Body rubber part 5 ... Diaphragm 6 ... Partition member 12 ... Air chamber
33 ... Support surface 45 ... Liquid chamber E ... Engine (mounting member) F ... Body frame (base) L ... Liquid P ... Mounting plane

Claims (1)

[Scope of utility model registration request] 1. A first mounting member which forms an air chamber having an open upper end and whose lower end is mounted on a base as a mounting surface, a second mounting member mounted on a mounting member, and a lower end of the first mounting member. A tubular member that is connected and has a support surface that expands upward in the inner circumference, and an upper portion of the tubular member that is interposed between the support surface of the tubular member and the second mounting member. A main body rubber portion that closes the tube and forms a liquid chamber with the tubular member, and a diaphragm that is provided between the tubular member and the first fitting to partition the liquid chamber and the air chamber, A liquid filled type vibration damping device comprising: a liquid filled in the liquid chamber, wherein an upper end opening of the first fitting and the supporting surface of the tubular member are inclined with respect to a mounting plane of the base. A liquid-filled type vibration damping device characterized by being formed by.