JP3040831B2 - Anti-vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for use in an engine mount of an automobile for damping and absorbing vibration from a vibration generating portion.

[0002]

2. Description of the Related Art In an automobile engine, an anti-vibration device as an engine mount is disposed between the engine and a vehicle body.
The vibration of the engine is prevented from being transmitted to the vehicle body.

[0003] A main liquid chamber and a sub liquid chamber filled with liquid are formed inside the vibration isolator, and the main liquid chamber and the sub liquid chamber are provided with a first restriction passage for absorbing shake vibration and a first restricting passage. They are connected to each other through a second restriction passage for absorbing idle vibration having a higher frequency than shake vibration.
The second restriction passage has a larger cross-sectional area than the first restriction passage in a direction orthogonal to the longitudinal direction (the direction in which the liquid passes). The second restriction passage is provided with a passage opening / closing member that brings the main liquid chamber and the sub liquid chamber into a communicating state and a non-communicating state.

[0004] In the above-mentioned vibration damping device, when the vehicle is running at a high speed and the like, and the shake vibration is generated, the second restricting passage is disconnected by the passage opening / closing member, that is,
The liquid is brought into and out of the main liquid chamber and the sub liquid chamber only through the first restriction passage. The shake vibration is absorbed by resistance or liquid column resonance when the liquid passes through the first restriction passage. On the other hand, when the vehicle speed is stopped or the vehicle is running at a low speed of, for example, about 5 km / h and idling vibration is generated, the first restriction passage is clogged.
The second restriction passage is brought into communication with the passage opening / closing member, and the liquid flows between the main liquid chamber and the sub liquid chamber via the second restriction passage. Therefore, the idle vibration is absorbed by resistance or liquid column resonance when the liquid passes through the second restriction passage.

[0005]

As described above, the conventional vibration isolator is provided with one restriction passage for shake vibration and one restriction passage for idle vibration.

However, since the idle vibration has a wide frequency range, it is difficult to sufficiently absorb the idle vibration with one restriction passage. In this case, it is conceivable to provide a plurality of restriction passages for idle vibration and switch each restriction passage according to the frequency to sufficiently absorb the idle vibration, but it is necessary to provide a passage opening / closing member in each restriction passage. Therefore, the device becomes complicated.

In view of the above, an object of the present invention is to provide a vibration isolator capable of absorbing vibrations over a wide frequency range without complicating the device.

[0008]

According to the present invention, there is provided an anti-vibration apparatus comprising: an outer cylinder connected to one of a vibration generator and a vibration receiver;
The outer cylinder member is connected to the other of the vibration generating unit and the vibration receiving unit.
Inner and inner tube provided in the elastic body deforms when vibration occurs is provided between the outer cylinder and the inner cylinder, the inner and the outer cylinder of the
An intermediate block and, said elastic member and at least a portion of the partition wall collapsible main liquid chamber provided between the cylinder, the intermediate
A secondary liquid chamber which is isolated from the main liquid chamber through the block, before
Serial provided in the intermediate block, and the first, second and third restricting passage communicating respectively with said main liquid chamber and the auxiliary liquid chamber, said intermediate
An opening / closing member that is disposed in the block and that can open and close the second restriction passage and the third restriction passage, and the second restriction passage and the third restriction passage are closed in accordance with the frequency of vibration by the vibration generator The first state, the second restriction passage is opened and the third
Control means for controlling the opening / closing member in a second state in which the restriction passage is closed and in a third state in which the third restriction passage is opened.

[0009]

According to the present invention, first, second, and third restriction passages are provided for communicating the main liquid chamber and the sub liquid chamber, respectively. When the vibration is generated by the vibration generating unit, the opening / closing member is controlled by the control means in accordance with the frequency of the vibration, and the first and second restriction passages are closed, and the second restriction passage is closed. The second state is such that the restriction passage is opened and the third restriction passage is closed, and the third state is that the third restriction passage is opened.

In the first state, the liquid moves between the main liquid chamber and the sub liquid chamber through the first restriction passage. Therefore, the vibration generated by the vibration generating unit is absorbed by the resistance when the liquid passes through the first restriction passage and the liquid column resonance. In the second state, the liquid moves between the main liquid chamber and the sub liquid chamber through the second restriction passage. Therefore, the vibration generated by the vibration generating unit is absorbed by the resistance when the liquid passes through the second restriction passage and the liquid column resonance. In the third state,
Liquid moves between the main liquid chamber and the sub liquid chamber through the third restriction passage. Therefore, the vibration generated by the vibration generating unit is absorbed by the resistance and the liquid column resonance when the liquid passes through the third restriction passage.

As described above, according to the present invention, the first, second, and third states are switched by the control means in accordance with the frequency of vibration, so that effective vibration can be absorbed in accordance with the frequency of vibration. At the same time, vibration over a wide frequency range can be absorbed.

[0012]

FIG. 2 is an exploded perspective view of a vibration isolator 10 according to the present invention.

The vibration isolator 10 has a cylindrical inner cylinder 12, and as shown in FIG. 1, a cylindrical outer cylinder 16 is disposed parallel to the inner cylinder 12. In this embodiment, the inner cylinder 12 is connected to an engine (not shown) as a vibration generator via a bracket. The outer cylinder 16 is connected to a vehicle body (not shown) as a vibration receiving portion via a bracket.

A thin rubber layer 13 is vulcanized and bonded inside the outer cylinder 16. A part of the thin rubber layer 13 is
The diaphragm 22 is separated from the inner peripheral surface of the diaphragm 22. Further, intermediate blocks 17 and 18 are inserted into the outer cylinder 16.

The intermediate block 18 has a substantially semicircular block shape when viewed from the axial direction of the outer cylinder 16. The outer peripheral surface of the intermediate block 18 is in close contact with the inner peripheral surface of the thin rubber layer 13. The intermediate block 17 has flange portions 17A formed at both ends in the axial direction so that the outer peripheral surface is in close contact with the thin rubber layer 13 and the linear portion is in contact with the intermediate block 18 to prevent relative movement with the intermediate block 18. . The intermediate block 17 has a cutout 1 at the center facing the intermediate block 18.
7B is formed, and the inner cylinder 12 penetrates. This inner cylinder 1
2, the main rubber 14 is stretched between the intermediate block 17 and the intermediate block 17. This allows the inner cylinder 12 to move relative to the outer cylinder 16. Body rubber 14 is intermediate block 1
8 is vulcanized and bonded to the top surface, but has a cutout portion 14 that forms a main liquid chamber 28 between the intermediate block 18 and a part of the intermediate portion.
A is formed. The intermediate block 17 has a sub liquid chamber 30 whose inner peripheral surface is defined by the intermediate block 17 and whose outer peripheral surface is partitioned by the thin rubber layer 13 and the diaphragm 22 between the flange portions 17A. These main liquid chambers 2
8. The sub liquid chamber 30 is filled with a liquid such as water or oil.

The intermediate block 18 faces the main liquid chamber 28,
Further, a circular hole 44 is formed in the radial direction of the outer cylinder 16.
The intermediate block 18 has a passage 32 and a passage 36 extending radially outward of the circular hole 44. One end of the passage 32 communicates with the circular hole 44, and the other end communicates with a passage 33 formed on the outer periphery of the intermediate block 18. The passage 33 communicates with the auxiliary liquid chamber 30. The passage 36 has one end communicating with the circular hole 44 and the other end communicating with the passage 42 formed on the outer periphery of the intermediate block. The passage 42 communicates with the sub liquid chamber 30. The passage 32 has a larger cross-sectional area (hereinafter, referred to as a passage cross-sectional area) in a direction orthogonal to the longitudinal direction (the passage direction of the liquid) than the passage 36. In the present embodiment, the passage 36 is formed to have a passage cross-sectional area capable of effectively absorbing idle vibration in a low frequency range (15 Hz to 30 Hz), and the passage 32 transmits idle vibration in a high frequency range (30 Hz to 50 Hz). Each of the idle orifices 3 is formed to have a passage cross-sectional area that can be effectively absorbed.
8, 50.

The rotor 52 is inserted into the circular hole 44. The rotor 52 partially penetrates the outer cylinder 16, and can rotate by receiving a driving force of a motor 48 attached to the outer periphery of the outer cylinder 16. Motor 4
8 is connected to the control means 46. The control means 46 is connected to a vehicle speed sensor 43 for detecting the vehicle speed and an engine speed sensor 45 for detecting the engine speed.

The tip of the rotor 52 facing the main liquid chamber 28 has a cylindrical shape, and is shown in FIGS. 4 (A) to 6 (B).
As shown in FIG. 2, a through hole 56 and a through hole 54 having a larger hole are formed in a part of the cylindrical peripheral surface. Depending on the rotational position of the rotor 52, the through holes 54 and 56 are in a non-communication state (FIGS. 4A and 4B) between the passages 32 and 36, and a communication state only in the passage 36 (FIGS. 5A and 5B). Or passage 3
2 and the passage 36 (FIGS. 6A and 6B).

On the outer peripheral surface of the intermediate block 18, a passage 34 for forming a shake orifice 40 is provided.
One end of the passage 34 communicates with the auxiliary liquid chamber 30 at a portion opposite to the passage 33 via the inner cylinder 12, and the intermediate block 18.
Communicates with the main liquid chamber 28 through an opening 34A (see FIG. 2) formed in the inner peripheral portion of the main liquid chamber. Therefore, the passage 34 always connects the main liquid chamber 28 and the sub liquid chamber 30. The passage 32 has a passage sectional area smaller than the passage 36.

An air chamber is provided between the diaphragm 22 and the outer cylinder 16 and communicates with the outside if necessary.

The operation of this embodiment will be described below. When the vehicle runs at a high speed of, for example, 70 to 80 km / h or more, shake vibration (less than 15 Hz) occurs. The control means 46 determines from the vehicle speed sensor 43 and the engine speed sensor 45 whether or not shake vibration occurs. When it is determined that the shake vibration is occurring, the rotor 52 is moved to the position shown in FIGS.
Is controlled, that is, the motor 48 is controlled so that the passage 32 and the passage 36 are not communicated with each other by the outer peripheral surface of the rotor 52.

As a result, the liquid is supplied to the idle orifice 3
The passage between the main liquid chamber 28 and the sub liquid chamber 30 through 8, 50 is prevented. Therefore, the liquid moves between the main liquid chamber 28 and the sub liquid chamber 30 only through the shake orifice 40. Therefore, the shake when the liquid passes through the shake orifice 40 or the liquid column resonance absorbs the shake vibration.

Further, when the switch of the air conditioner is turned on during idling, idle vibration (15 to 30 Hz) in a low frequency range is generated. The control means 46 determines from the vehicle speed sensor 43 and the engine speed sensor 45 whether or not idle vibration in a low frequency range occurs. If it is determined that idle vibration in a low frequency range is occurring, the rotor 52 is brought into the state shown in FIGS. 5A and 5B, that is, the passage 36 is communicated with the through hole 56. And the motor 48 is controlled such that the passage 32 is not communicated with the outer peripheral surface of the rotor 52.

As a result, the liquid is supplied to the idle orifice 38.
Between the main liquid chamber 28 and the sub liquid chamber 30 is prevented. In this state, shake orifice 4
0 is in a clogged state. Therefore, the liquid moves between the main liquid chamber 28 and the sub liquid chamber 30 through the orifice 50. Therefore, the idle vibration in a relatively low frequency range is absorbed by the resistance or the liquid column resonance when the liquid passes through the idle orifice 50.

When the switch of the air conditioner is turned off during idling, idle vibration (30 to 50 Hz) in a higher frequency range than the above occurs. The control means 46 includes a vehicle speed sensor 43 and an engine speed sensor 45.
It is determined whether or not idle vibration in a higher frequency range is occurring. When it is determined that idle vibration in a high frequency range is occurring, the rotor 52 is moved to the position shown in FIG.
(B), that is, the through hole 5
The motor 48 is controlled such that the passages 32 and 36 are communicated by the passages 4 and 56.

In this case, since the idle vibration in the high frequency range is generated, the shake orifice 40 and the idle orifice 50 are clogged. Thus, liquid travels only through the idle orifice 38. The idle vibration in a high frequency range is absorbed by resistance or liquid column resonance when the liquid passes through the idle orifice 38. In the present embodiment, a passage 36 for absorbing idle vibration in a high frequency range is provided.
Since the idle vibration in the high frequency range is absorbed by the resistance or the liquid column resonance when the liquid passes through the filter, the idle vibration in the high frequency range can be sufficiently absorbed. Further, in this embodiment, one end of each of the passages 32 and 36 is communicated with the circular hole 44, and the rotor 52 having the through holes 54 and 56 is disposed in the circular hole 44 as described above. Passage 3
Since the devices 2 and 36 can be in the communication state and the non-communication state, there is an effect that the apparatus is not complicated.

In the above embodiment, three paths are provided and the path used for absorbing vibration is switched according to the frequency.
Three or more passages may be provided, and each passage may be switched according to the frequency. By doing this,
Vibration over a wider frequency range can be absorbed.

Further, in the above description, the passage 36 is in the communicating state when the idle vibration in the high frequency range is generated. However, the passage 36 may be closed to actively disconnect.

Further, in the above embodiment, the passage cross-sectional area is increased in the order of the shake orifice 40, the idle orifice 50, and the idle orifice 38. The size of the cross-sectional area may be in any order.

[0030]

As described above, according to the present invention, the first to third restriction passages are provided in the intermediate block, and the opening / closing member which can be opened and closed by the control means is provided in the intermediate block. Therefore, there is an excellent effect that a vibration isolator capable of absorbing vibrations over a wide frequency range can be obtained without complicating the device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vibration isolator according to one embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main part of FIG.

FIG. 3 is an exploded perspective view showing an intermediate block and a motor.

4A is a cross-sectional view of the intermediate block taken along line IV-IV in FIG. 1, and FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG. 4A.

5A is an operation diagram of FIG. 4A, and FIG. 5B is a diagram of FIG.
It is sectional drawing in the VB-VB line of (A).

6A is an operation diagram of FIG. 4A, and FIG. 6B is a diagram of FIG.
It is sectional drawing in the IV-IV line of (A).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Inner cylinder (1st member) 14 Rubber body (elastic body) 16 Outer cylinder (2nd member) 26 Liquid 28 Main liquid chamber 30 Sub liquid chamber 38 Idle orifice (restriction passage) 40 Shake orifice (Restricted passage) 46 Control means 50 Idle orifice (Restricted passage) 48 Motor 52 Rotor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-228948 (JP, A) JP-A-63-172035 (JP, A) JP-A-2-11945 (JP, A) JP-A-3-3 103637 (JP, A) JP-A-5-202980 (JP, A) JP-A-5-248487 (JP, A) JP-A-3-78148 (JP, U) US Patent 4,783,062 (US, A) US Patent 4,789,143 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 13/26 F16F 13/28 B60K 5/12

Claims (1)

(57) [Claims] An outer cylinder connected to one of the vibration generator and the vibration receiver, and an outer cylinder connected to the other of the vibration generator and the vibration receiver ,
An inner cylinder provided on the inner peripheral side of the outer cylinder member;
An elastic body which deforms when vibration occurs is provided between the cylindrical front
An intermediate block provided between the outer cylinder and the inner cylinder, a main liquid chamber that can expand and contract with the elastic body as at least a part of a partition wall, and the main liquid chamber through the intermediate block. A first, a second, and a third restriction passage provided in the intermediate block and communicating with the main liquid chamber and the sub liquid chamber, respectively ; An opening / closing member capable of opening and closing the second and third restricted passages; a first state in which the second and third restricted passages are closed according to the frequency of vibration by the vibration generating unit; Control means for controlling the opening / closing member to a second state in which the restriction passage is opened and the third restriction passage is closed, and a third state in which the third restriction passage is opened. .