JPH0721937Y2 - Liquid-filled mount - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a liquid-filled mount for use in automobiles, and in particular, a low spring constant is obtained in a high frequency range and a high damping characteristic is obtained in a low frequency range. And a liquid-filled mount.

[Conventional technology]

As prior arts related to the present invention, there are known JP-A-60-139940, JP-A-60-71749, JP-A-60-143947, and JP-A-62-25348.

The anti-vibration device disclosed in Japanese Unexamined Patent Publication No. 60-139940 is provided with a plurality of circumferentially spaced liquid chambers in an elastic body that connects the inner cylinder and the outer cylinder, and each of the liquid chambers is surrounded. By communicating with each of the directional and axial throttle passages, vibrations in all directions can be damped. Other Japanese Utility Model Laid-Open Nos. 60-71749, 60-143947 and 62-25348 also disclose a vibration isolation structure in which a liquid is enclosed.

The conventional liquid-filled type mount is, for example, Shoukai 62-25348.
As disclosed in the publication, it has a tubular orifice, and it is possible to obtain a high damping characteristic in the vibration in the low frequency range of 10 to 20 Hz.

[Problems to be solved by the invention]

However, in the structure in which the damping coefficient in the low frequency range is increased by the tubular orifice, the spring constant becomes large in the high frequency range of 100 to 500 Hz. When the spring constant increases, the vibration transmission increases, which causes a problem that the riding comfort of the vehicle and the bass sound of the vehicle deteriorate.

The present invention ensures a low dynamic spring constant for vibrations in the high frequency range and a high damping characteristic for vibrations in the low frequency range.
An object of the present invention is to provide a liquid-filled mount capable of improving the riding comfort of a vehicle and reducing the sound inside the vehicle.

[Means for solving problems]

The liquid-filled mount according to the present invention which meets this purpose connects an inner cylinder and an outer cylinder via a first elastic body and a second elastic body,
A liquid chamber in which a liquid is sealed is formed between the inner and outer cylinders by the elastic bodies, and the liquid chamber is fixed to either the inner cylinder or the outer cylinder and elastically deformable in the axial direction during high-frequency vibration in the axial direction. An elastic partition wall composed only of an elastic body divides the main liquid chamber located on the first elastic body side and the sub liquid chamber located on the second elastic body side, and the main liquid chamber and the sub liquid chamber are separated from each other by the elastic partition wall. And the inner and outer cylinders are connected by a flow passage formed in the circumferential direction,
The first elastic body on the main liquid chamber side has an axial rigidity greater than that of the second elastic body on the sub liquid chamber side.

[Action]

In the liquid-filled mount configured as described above,
When an axial force acts on the inner cylinder during vibration in the low frequency range, the volume of one liquid chamber decreases according to the vibration direction, and conversely the volume of the other liquid chamber increases. Thereby, for example, the liquid in the main liquid chamber flows into the sub liquid chamber through the flow passage formed between the elastic partition wall and the inner and outer cylinders, and the damping force is generated by the flow resistance when the liquid passes through the flow passage. Occurs.

Similarly, when an axial force acts on the inner cylinder during vibration in a high frequency range, the volumes of the main liquid chamber and the sub liquid chamber change, but since the frequency is high, the liquid passes through the flow path. The resistance when doing is increased. That is, when vibrating in the high frequency range, the state is the same as when the flow path is clogged. Therefore, the liquid in the main liquid chamber cannot pass through the flow path, and the elastic partition wall is elastically deformed. When the elastic partition is elastically deformed, the liquid in that portion flows in the axial direction according to the elastic deformation of the elastic partition, and a resonance phenomenon occurs due to the mass of the liquid and the volume elasticity of the first liquid chamber and the second liquid chamber. . Under such a resonance phenomenon, a phase difference of forces occurs, so that the spring constant keeps a low value up to the resonance frequency, and the spring constant can be reduced in the high frequency range.

Further, since the axial rigidity of the first elastic body on the main liquid chamber side is greater than the axial rigidity of the second elastic body on the sub liquid chamber side, the piston due to the displacement of the first elastic body By the action, the main liquid chamber side positively causes a resonance action with respect to the vibration in the axial direction. On the other hand, since the axial rigidity of the second elastic body on the side of the sub liquid chamber is smaller than that of the first elastic body, the piston action due to the displacement of the second elastic body is small, and the main liquid is on the side of the sub liquid chamber. The resonance action is smaller than that on the room side. Therefore, the resonance does not become too large for the entire liquid-filled mount, and the spring characteristics in the high frequency range do not change significantly.

When a force is applied to the liquid-filled mount in the direction perpendicular to the axial direction, the liquid will flow along the circumferential direction between the outer cylinder and the inner cylinder, so high damping characteristics will be obtained due to its flow resistance. be able to. When the displacement is large, the elastic partition wall is brought into contact with either the outer cylinder or the inner cylinder, and the spring characteristic in the direction perpendicular to the axial direction can be made non-linear.

〔Example〕

Hereinafter, a preferred embodiment of a liquid-filled mount according to the present invention will be described with reference to the drawings.

First Embodiment FIGS. 1 and 2 show a first embodiment of the present invention, particularly an example applied to a mount used for a suspension of an automobile. In the figure, reference numeral 1 indicates an inner cylinder, and an outer cylinder 2 is arranged on the outer cylinder of the inner cylinder 1. The upper end of the outer cylinder 2 projects from the upper end of the inner cylinder 1, and conversely, the lower end of the inner cylinder 1 projects from the lower end of the outer cylinder 2. The upper end of the outer cylinder 2 is formed with a flange portion 3 that bulges outward in the radial direction. A reinforcing member 4 extending in the circumferential direction and having a substantially L-shaped cross section is located inside the upper end of the outer cylinder 2. The lower end portion 4a of the reinforcing member 4 slightly protrudes inward in the radial direction. The outer peripheral portion of the flange portion 3 is bent inward in the radial direction, and the outer peripheral end of the reinforcing member 4 is wrapped and held by the bent portion 5.

The inner cylinder 1 and the outer cylinder 2 are connected by a first elastic body 6 and a second elastic body 7 located between the inner and outer cylinders. The inner side of the first elastic body 6 is joined to the outer peripheral surface of the inner cylinder 1, and the outer side of the first elastic body 6 is joined to the inner peripheral surface of the reinforcing member 4 and the inner peripheral surface of the outer cylinder 2. The first joined to the inner peripheral surface of the outer cylinder 2
The region of elasticity 6 of serves as a sealing member. The inner side of the second elastic body 7 is joined to the outer peripheral surface of the ring 8 press-fitted into the inner cylinder 2, and the outer side of the second elastic body 7 is joined to the inner peripheral surface of the lower end portion of the outer cylinder 2. There is.

The axial thickness of the first elastic body 6 is larger than the axial thickness of the second elastic body 7. Thereby, the axial rigidity of the first elastic body 6 is higher than the axial rigidity of the second elastic body 7. In addition, the lower end of the reinforcing member 4
Since 4a projects inward in the radial direction, the rigidity of the first elastic body 6 in the axial direction is also increased by the lower end portion 4a.

A liquid chamber 9 is formed between the inner cylinder 1 and the outer cylinder 2 by surrounding the elastic bodies 6 and 7. The liquid chamber 9 is filled with, for example, low-viscosity water or ethylene glycol. The liquid chamber 9 is provided with an elastic partition wall 12 composed of only an elastic body that divides the liquid chamber 9 into a main liquid chamber 10 on the first elastic body 6 side and a sub liquid chamber 11 on the second elastic body 7 side. Has been. Elastic bulkhead 12
Has a substantially trapezoidal cross section and is fixed only to the inner cylinder 1. That is, a gap is formed between the outer peripheral surface of the elastic partition wall 12 and the inner peripheral surface of the outer cylinder 2. In this embodiment,
For the convenience of production, the first elastic body 6 and the elastic partition wall 12 are the inner cylinder 2
Are connected on the outer peripheral surface.

The gap between the outer peripheral surface of the elastic partition 12 and the inner peripheral surface of the outer cylinder 2 is
A flow path 15 connects the main liquid chamber 10 and the sub liquid chamber 11.
As shown in FIG. 2, the flow paths 15 extend at equal intervals in the circumferential direction. Further, the outer peripheral surface of the elastic partition wall 12 can come into contact with the inner peripheral surface of the outer cylinder 2. In other words, the axial center A is attached to the inner cylinder 1.
When the displacement of the inner cylinder 1 and the outer cylinder 2 becomes large due to the load acting in the direction perpendicular to the direction, the elastic partition wall 12 contacts the outer cylinder 2.

The outer cylinder 2 is fitted and held in a hole 14 formed in the body of the automobile. A flange member 16 is provided on the upper end surface of the inner cylinder 1, and a bolt 17 is inserted into the flange member 16 and the inner cylinder 1. The flange member 16 bulges outward in the radial direction, and its diameter is substantially the same as the diameter of the flange member 3 of the outer cylinder 2. A stopper 18 made of an elastic body having a triangular cross section is provided on the top surface of the reinforcing member 4 located right above the flange member 3.
Are joined. The collar member 16 can contact the stopper 18, and when the vehicle is stopped, the collar member 16 and the stopper 18 are in contact with each other.
A gap is formed between and. A suspension differential device 19 is connected to the lower end of the bolt 17.

Next, the operation of the first embodiment will be described.

When a load is applied to the inner cylinder 1 connected to the suspension via the bolts 17 from the lower side of the drawing, the volume of the main liquid chamber 10 is reduced and the volume of the sub liquid chamber 11 is increased. That is, since the outer peripheral portion of the first elastic body 6 is less likely to be deformed by the reinforcing member 4, the first elastic body 6 and the elastic partition wall are not deformed.
The main liquid chamber 10 located between the inner wall 1 and the inner wall 12 is contracted by the movement of the elastic partition 12 accompanying the movement of the inner cylinder 1. As a result, the liquid in the liquid chamber 9 flows from the main liquid chamber 10 into the sub liquid chamber 11. In this case, the liquid flows into the sub liquid chamber 11 via the flow path 15 extending in the circumferential direction, and high damping characteristics are obtained due to the flow resistance when passing through the flow path 15.

When the vibration in the high frequency range is transmitted to the inner cylinder 1, the resistance when the liquid passes through the flow passage 15 becomes large due to the high vibration, so that the liquid does not flow into the flow passage 15 and the elastic partition wall is generated by the pressure of the liquid.
12 is elastically deformed in the axial direction. Therefore, the liquid near the elastic partition 12 flows in the vertical direction as the elastic partition 12 elastically deforms, and a resonance phenomenon occurs due to the mass of this liquid and the volume elasticity of the main liquid chamber 10 and the sub liquid chamber 11. That is, under such a phenomenon, a force phase difference occurs, so that the mount spring constant maintains a low value up to the resonance frequency. Therefore, the spring constant can be reduced in the high frequency range, and the vibration insulation can be improved.

Since the axial rigidity of the first elastic body 6 on the main liquid chamber 10 side is greater than the axial rigidity of the second elastic body 7 on the sub liquid chamber 11 side, the main liquid chamber 10 Side is first for axial vibration
Resonance action is positively caused by the piston action of the elastic body 6, but since the axial rigidity of the second elastic body 7 on the side of the sub liquid chamber 11 is smaller than that of the first elastic body 6, The piston action due to the displacement of the second elastic body 7 is small, and the resonance action on the side of the sub liquid chamber 11 is smaller than that on the side of the main liquid chamber 10. Therefore, the resonance does not become too large for the entire liquid-filled mount, and the spring characteristics in the high frequency range are prevented from largely changing.

In this way, high damping characteristics are obtained for vibrations in the low frequency range,
Since a low spring constant is obtained with vibration in a high frequency range, the riding comfort of the vehicle is improved and the sound inside the vehicle is also reduced.

Furthermore, when a load is applied to the inner cylinder 1 in a direction perpendicular to the axial center A direction, the liquid in the liquid chamber 9 flows along the inner peripheral surface of the outer cylinder 2 due to the movement of the inner cylinder 1, and occurs at this time. High damping characteristics can be obtained by the flow resistance. Then, when the displacement of the inner cylinder 1 is large, the elastic partition wall 12 abuts on the inner peripheral surface of the outer cylinder 2, so that the spring characteristic in the direction perpendicular to the axis A direction can be made non-linear, and the function of the mount can be achieved. Can be increased.

Second Embodiment FIG. 3 shows a second embodiment of the present invention.

Since this embodiment conforms to the configuration of the first embodiment, the corresponding parts are denoted by the same reference numerals as those of the first embodiment, and the description of the corresponding parts is omitted. Only different parts will be described.
The same applies to other embodiments described later.

In FIG. 3, reference numeral 51 denotes an elastic partition wall made of only an elastic body, and the elastic partition wall 51 is fixed to the inner cylinder 1. The elastic partition wall 51 includes a circular plate 52 made of an elastic body arranged in a direction perpendicular to the axis A, and plates 53, 54 made of an elastic body joined to the plate 52 and extending along the axis A direction.
It consists of and. The plate 54 is arranged at a right angle to the plate 53. A stopper rubber 55 is joined to the inner peripheral surface of the outer cylinder 2 so that the outer peripheral portion of the elastic partition wall 51 can come into contact with the inner cylinder 1 when the inner cylinder 1 is largely displaced in the direction perpendicular to the axis A direction.

In the second embodiment configured as described above, when the low frequency vibration acts on the inner cylinder 1, the plates 52, 53, 54 move in the liquid in accordance with the movement in each direction. Become. Therefore, the flow of the liquid in the liquid chamber 9 is changed by the movement of the elastic partition wall 51, and a large damping force can be obtained in all three axial directions.

When vibration in the high frequency range is applied to the inner cylinder 1, the liquid in the liquid chamber 9 is agitated by each plate of the elastic partition wall 51. In this state, the mass of the stirred liquid and the liquid chamber
A resonance system is created by the volume elasticity of 10 and 11. Therefore, the spring constant is maintained at a low value up to the resonance frequency, and the spring constant in the high frequency range can be reduced in the three axis directions. Other functions are the same as in the first embodiment.

Third Embodiment FIGS. 4 and 5 show a third embodiment of the present invention. In the figure, reference numeral 71 denotes an elastic partition wall made of only an elastic body, and its shape is almost the same as that of the first embodiment. In the first embodiment, the elastic partition wall 12 and the first elastic body 6 are integrally formed, but in this embodiment, the elastic partition wall 71 and the first elastic body 6 are integrally formed.
It is separated from the elastic body 6. First in the liquid chamber 9
A rigid plate 72 fixed to the inner cylinder 1 is arranged between the elastic body 6 and the elastic partition wall 71. Rigid plate 72
Is a circular plate, the diameter of which is smaller than the diameter of the elastic partition 71. Further, the elastic partition 71 is the inner cylinder 1
When it is largely displaced, it comes into contact with the outer cylinder 2.

In the third embodiment constructed in this way, when the amplitude is relatively large, such as when the automobile is oscillating or shaking, the inner cylinder 1 vibrates in the low frequency range 10 to 20 Hz, and the liquid chamber 9 is elastically divided.
71 moves in the axial direction. In this case, the volumes of the main liquid chamber 10 and the sub liquid chamber 11 change, the liquid flows in the flow path 15 between the elastic partition 71 and the outer cylinder 2, and a damping force is generated by the flow resistance of the liquid.

Further, when road noise and engine noise increase during high-speed traveling, the inner cylinder 1 vibrates with a small amplitude in the high frequency range of 100 to 500 Hz. In this state, due to the high-speed vibration, the flow channel resistance of the fluid when flowing through the flow channel 15 becomes large, and the flow channel 15 becomes similar to the clogged state. Since the elastic partition wall 71 is not a rigid body, the spring constant does not increase until the vibration frequency reaches about 200 Hz, but in the structure without the rigid body pret 72, the spring constant increases at a frequency higher than this and the vehicle interior noise increases. Getting worse.

In the present embodiment, since the rigid plate 72 that moves integrally with the inner cylinder 1 is provided between the first elastic body 6 and the elastic partition wall 71, it is possible to obtain the resonance coefficient that is defined by the mass of the liquid and the volumetric elastic coefficient of the liquid chamber. The resonance frequency can be set to 500 Hz or higher. And since the spring constant up to the resonance frequency can be lowered, 50
It becomes possible to reduce the transmission of vibration up to about 0 Hz.

Fourth Embodiment FIG. 6 shows a fourth embodiment of the present invention. This embodiment is substantially the same as the third embodiment, and only the configuration of the rigid plate is slightly different. In the figure, 81 indicates a rigid plate. In the third embodiment, the rigid plate 72 is composed of only a circular plate, but in this embodiment, the rigid plate 81 is composed of a circular plate 82 and a ring-shaped rigid ring member 83. . Rigid ring member 83
Are provided on the outer periphery of the plate 82, and the diameter thereof is smaller than the diameter of the elastic partition 71.

In the fourth embodiment configured in this way, by adding the elastic ring member 83, the damping effect on the displacement in the direction perpendicular to the axial direction can be increased.

Fifth Embodiment FIG. 7 shows a fifth embodiment of the present invention. This embodiment differs from the third embodiment only in the elastic partition mounting structure and its shape. In the figure, reference numeral 91 denotes an elastic partition wall made of only an elastic body, and this elastic partition wall 91 is fixed to the outer cylinder 2 contrary to the above embodiment. A gap extending in the circumferential direction is formed between the inner peripheral surface of the elastic partition wall 91 and the inner cylinder 1, and this gap connects the main liquid chamber 10 and the sub liquid chamber 11 with a flow passage 92.
Are configured.

In the fifth embodiment configured as described above, the volumes of the main liquid chamber 10 and the sub liquid chamber 11 are changed by the vibration acting on the inner cylinder 1, and are formed between the elastic partition wall 91 and the inner circumference 1. The liquid flows through the flow path 92 to generate a damping force. Further, when the relative movement of the inner cylinder 1 and the outer cylinder 2 in the direction perpendicular to the axial direction becomes large, the elastic partition wall 91 abuts the inner cylinder 1, so that a non-linear spring constant can be obtained.

Sixth Embodiment FIG. 8 shows a sixth embodiment of the present invention. This embodiment is substantially the same as the third embodiment, and is different in that the positions of the elastic partition and the rigid plate are opposite. In the present embodiment, the rigid plate 101 is arranged in the sub liquid chamber 11 located between the elastic partition 7 and the elastic partition 102 which is made of only an elastic body having a rectangular cross section.

In the sixth embodiment having such a configuration, the same effect as that of the third embodiment can be obtained. That is, by providing the rigid plate 101 that moves integrally with the inner cylinder 1, the resonance frequency is set to 500
It becomes possible to make it above Hz, and it is possible to reduce the spring constant in the high frequency range.

Seventh Embodiment FIG. 9 shows a seventh embodiment of the present invention. This embodiment is substantially similar to the fifth embodiment, and the different part is that the rigid plate 111 is fixed to the outer cylinder 2. That is, in the fifth embodiment, the rigid plate 111 is fixed to the inner cylinder 1, but in the present embodiment, both the elastic partition wall 91 made of an elastic body and the rigid plate 111 are fixed to the outer cylinder 2. . In the seventh embodiment constructed in this way, substantially the same effects as in the fifth embodiment can be obtained.

[Effect of device]

According to the liquid-filled mount of the present invention, the liquid chamber in which the inner cylinder and the outer cylinder are connected via the first elastic body and the second elastic body, and the liquid is sealed between the inner and outer cylinders by each elastic body. And the liquid chamber is located on the first elastic body side by an elastic partition wall that is fixed to either the inner cylinder or the outer cylinder and is elastically deformable in the axial direction during high-frequency vibration in the axial direction. It is divided into a liquid chamber and a sub liquid chamber located on the second elastic body side, and the main liquid chamber and the sub liquid chamber are connected by a flow passage formed between the elastic partition wall and the inner and outer cylinders and extending in the circumferential direction. Therefore, when vibrating in a low-frequency region where the amplitude is large, the volume of each liquid chamber changes with the vibration in the axial direction, and high damping characteristics can be obtained due to the flow resistance of the liquid flowing through the flow path.

Further, when vibrating in a high-frequency region with a small amplitude, the flow path is closed due to high-speed vibration, and the resonance system can be configured by the elastic deformation of the elastic partition and the action of the liquid mass. Therefore, under the resonance phenomenon, a phase difference of forces occurs and the spring constant can be reduced. Since the axial rigidity of the first elastic body on the main liquid chamber side is greater than the rigidity of the second elastic body on the sub liquid chamber side in the axial direction, it is possible to prevent the resonance from becoming too large. Therefore, it is possible to prevent the spring characteristics from largely changing. Therefore, the vibration insulation in the high frequency range is improved, and the riding comfort of the vehicle can be improved and the sound inside the vehicle can be reduced.

Further, with respect to the vibration in the direction orthogonal to the axial direction, the liquid in the liquid chamber flows along the inner peripheral surface of the outer cylinder, so that a damping force can be obtained even with respect to the vibration in this direction. Moreover, when this displacement becomes large, the elastic partition wall comes into contact with either the outer cylinder or the inner cylinder, so that a non-linear spring constant can be obtained, and ride comfort and mount durability are further improved. It becomes possible.

In the present invention, since the tubular orifice unlike the conventional structure is not constructed, the structure of the mount is simplified, which is advantageous in terms of cost.

[Brief description of drawings]

1 is a sectional view of a liquid-filled mount according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a sectional view of the liquid-filled mount according to the third embodiment of the present invention, FIG. 5 is a sectional view taken along line XX of FIG. 4, and FIG. Is a sectional view of a liquid-filled mount according to a fourth embodiment of the present invention, FIG. 7 is a sectional view of a liquid-filled mount according to a fifth embodiment of the present invention, and FIG. 8 is a sixth embodiment of the present invention. FIG. 9 is a cross-sectional view of a liquid-filled mount according to FIG. 9, and FIG. 9 is a cross-sectional view of a liquid-filled mount according to a seventh embodiment of the present invention. 1 ... Inner cylinder 2 ... Outer cylinder 6 ... First elastic body 7 ... Second elastic body 9 ... Liquid chamber 10 ... Main liquid chamber 11 ... Sub liquid chamber 12, 51, 71, 91 , 102 …… Elastic bulkhead 15,92 …… Flow path

Claims (1)

[Scope of utility model registration request] 1. An inner cylinder and an outer cylinder are connected via a first elastic body and a second elastic body, and each elastic body forms a liquid chamber in which a liquid is sealed between the inner and outer cylinders. The liquid chamber is fixed to either one of the inner cylinder and the outer cylinder and is elastically deformable in the axial direction at the time of high frequency vibration in the axial direction. 2 to the sub-liquid chamber located on the elastic body side, and the main liquid chamber and the sub-liquid chamber are communicated with each other by a flow passage formed between the elastic partition wall and the inner and outer cylinders and extending in the circumferential direction. A liquid-filled mount characterized in that the first elastic body on the liquid chamber side has a greater axial rigidity than the second elastic body on the sub-liquid chamber side in the axial direction.