JP2006017164A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ease restrictions of a negative pressure pipe or a negative pressure tank when controlling vibration from an engine by pressure variation of a negative pressure and an atmosphere pressure generated in the engine. <P>SOLUTION: A liquid-tight pressure chamber 17 is formed in an active mount device 4, a fluid pressure generating device 7 independent from it is provided near a flow rate adjustment device (throttle valve) 54, and the atmosphere pressure and the negative pressure introduced are switched by a switching valve 10, and are supplied to an air chamber 21 of a fluid pressure generator 11. When the volume of the air chamber 21 is varied, the fluid pressure in accordance with the supplied atmospheric pressure is outputted from an adjacent fluid pressure output chamber 23 through an excitation plate 22, and is supplied to the pressure chamber 17 of the active mount device through a fluid passage 18. A sub fluid chamber 25 independent from the pressure chamber 17 is formed in the active mount device, the sub fluid chamber 25 is communicated with the pressure chamber 17 through an orifice 26 and is made to resonate, and thereby vibration control effect by fluid pressure can be enhanced. A branch pipe 24 as a housing space is branched and connected to the fluid passage 18, and thereby pulsation of the fluid pressure is restrained by antiresonance action. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anti-vibration device that supports an engine of a vehicle, for example, while suppressing vibration of the engine of the vehicle. In particular, the engine is expanded and contracted by alternately introducing atmospheric pressure and negative pressure. This is suitable for suppressing vibration from the.

As such an anti-vibration device, for example, an air chamber is provided inside an engine mount, and atmospheric pressure and negative pressure are alternately supplied to the air chamber, and the air chamber is expanded and contracted by fluctuations in the atmospheric pressure. Thus, there are some which can control the vibration transmission characteristics from the engine and have a main negative pressure tank for storing the negative pressure created by the engine and a sub negative pressure tank near the engine mount (for example, Patent Document 1). ).
Japanese Patent Laid-Open No. 11-153181

However, the conventional vibration isolator requires a long pipe that supplies the engine-generated negative pressure to the engine mount. As a result, the magnitude of the negative pressure is reduced due to the flow resistance in the pipe. There is a risk that sufficient vibration isolation performance cannot be obtained.
The present invention has been made paying attention to the above-described problems, and an object thereof is to provide a vibration isolator capable of ensuring sufficient vibration isolating performance.

  In order to solve the above-described problems, a vibration isolator of the present invention includes a vibration isolating mechanism unit that is interposed between a vibrating body and a vehicle body side member and that exhibits a vibration isolating function, and a separate hydraulic pressure generator. The hydraulic pressure generator includes an air chamber in which at least one of a volume and a pressure changes according to a change in the supplied atmospheric pressure, and a switching unit that supplies an atmospheric pressure having a different pressure to the air chamber, and A fluid pressure output chamber is provided adjacent to the air chamber and outputs a fluid pressure corresponding to a change in at least one of the volume or pressure of the air chamber, and the vibration isolation mechanism is connected to a vibrating body. 1 connecting member, a second connecting member connected to the vehicle body side member, an elastic member provided between the first connecting member and the second connecting member, and the first connecting member and the first connecting member. Depending on the hydraulic pressure provided and supplied between the two connecting members. At least one of the pressure chambers changes, and the fluid pressure output chamber of the fluid pressure generator and the pressure chamber in the vibration isolation mechanism communicate with each other through a fluid path, and the operating state of the internal combustion engine or the traveling state of the vehicle By outputting a control signal to the switching means according to at least one of them, the hydraulic pressure supplied to the pressure chamber by supplying and discharging air having different pressures to the air chamber is adjusted, and the vibration is transmitted from the vibrating body. And a control means for controlling the characteristics.

  Thus, according to the vibration isolator of the present invention, the vibration isolating mechanism portion that is interposed between the vibrating body and the vehicle body side member and exhibits the anti-vibration function, and the separate hydraulic pressure generating device are provided. The hydraulic pressure generator includes an air chamber in which at least one of a volume and a pressure changes according to a change in supplied atmospheric pressure, a switching unit that supplies atmospheric pressures having different pressures to the air chamber, and the air A hydraulic pressure output chamber that is adjacent to the chamber and outputs a hydraulic pressure in accordance with a change in at least one of the volume or pressure of the air chamber, and the vibration isolation mechanism portion includes a first pressure coupled to the vibrating body. A connecting member; a second connecting member connected to the vehicle body side member; an elastic member provided between the first connecting member and the second connecting member; and the first connecting member and the second connecting member. At least what is in volume or pressure depending on the hydraulic pressure provided and supplied between the connecting members A pressure chamber in which one of them changes, and the fluid pressure output chamber of the fluid pressure generator and the pressure chamber in the vibration isolation mechanism communicate with each other through a fluid path, and at least one of the operating state of the internal combustion engine and the traveling state of the vehicle In response to this, by outputting a control signal to the switching means, the hydraulic pressure supplied to the pressure chamber by supplying and discharging air having different pressures to the air chamber is adjusted, and the vibration transmission characteristic from the vibrating body is controlled. For example, the length of the pipeline that supplies the negative pressure created by the engine is shortened, and the negative pressure does not decrease due to the flow resistance in the pipeline, ensuring sufficient vibration isolation performance. be able to. As a result, it is not necessary to install a large negative pressure tank that stores negative pressure.

Next, a first embodiment of the vibration isolator of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a vibration isolator according to the present embodiment, and reference numeral 1 in the drawing denotes an internal combustion engine constituted by an inline 4-cylinder gasoline engine. The internal combustion engine 1 includes an engine block 2 as a main body and a crankcase 3. The vibration isolator of this embodiment is an active mount device 4 that is interposed between a bracket 56 extending from the engine block 2 and the vehicle body and mounts the engine block 2 on the vehicle body.

Further, an intake passage 5 and an exhaust passage 6 are connected to the internal combustion engine 1, and an air intake port 51, an air cleaner case 52, a flow rate measuring device 53, a flow rate adjusting device (throttle) are connected to the intake passage 5. Valve) 54, an intake manifold 55, and the like, and a fluid pressure generating device 7 is provided in the vicinity of the flow rate adjusting device 54.
This hydraulic pressure generator 7 introduces a negative pressure from the atmospheric pressure introduction pipe line 8 for introducing atmospheric pressure from the intake passage 5 upstream of the flow rate adjusting device 54 and from the intake passage 5 downstream of the flow rate adjusting device 54. A switching valve 10 as switching means for switching and supplying a negative pressure introduction line 9, an atmospheric pressure introduced by the atmospheric pressure introduction line 8, and a negative pressure introduced by the negative pressure introduction line 9; 10 includes a hydraulic pressure generator 11 that generates a hydraulic pressure according to the atmospheric pressure and the negative pressure that are switched and supplied by 10, and a negative pressure tank 12 that is disposed in the negative pressure introduction line 9.

  The hydraulic pressure generator 11 includes a cylinder 20 that constitutes an outer wall, a vibration plate 22 that is disposed in the cylinder 20 and slides in the cylinder 20 and defines the inside of the cylinder 20 in two chambers. One chamber defined by the vibration plate 22 and the air chamber 21 connected to the switching valve 10 and the other chamber defined by the vibration plate 22 are filled with working liquid. A hydraulic output chamber 23 is provided. Accordingly, at least one of the volume and the pressure of the air chamber 21 changes depending on the atmospheric pressure and the negative pressure that are switched and supplied by the switching valve 10, that is, the supplied atmospheric pressure, and the air chamber 21 passes through the vibration plate 22. The hydraulic pressure output chamber 23 adjacent to the air chamber 21 outputs a hydraulic pressure corresponding to a change in at least one of the volume and pressure of the air chamber 21. The vibration plate 22 is elastically supported by a support spring or the like. The negative pressure tank 12 is provided to reduce negative pressure pulsation in the intake passage 5.

  Next, the configuration of the active mount device 4 will be described with reference to FIG. In the active mount device 4, a bolt 62 projects from a lower portion of the main body case 14, and the main body case 14 is fixed to the vehicle body using the bolt 62. That is, the main body case 14 and the bolt 62 constitute the second connecting member of the present invention. On the other hand, an elastic member 15 made of an elastic material such as rubber is fitted into the upper part of the cylindrical main body case 14, and a connecting member 16 is attached to the upper part of the elastic member 15. 16 is connected to a bracket 56 extending from the engine block 2. That is, the connecting member 16 constitutes the first connecting member of the present invention.

  A pressure chamber 17 adjacent to the elastic member 15 is formed between the main body case 14 and the elastic member 15. The pressure chamber 17 is a liquid-tight compartment, and is communicated with the hydraulic pressure output chamber 23 of the hydraulic pressure generator 7 through a liquid path 18 made of a pipe. Accordingly, when the hydraulic pressure output from the hydraulic pressure output chamber 23 changes, at least one of the volume of the pressure chamber 17 and the pressure in the pressure chamber 17 changes according to the supplied hydraulic pressure. Therefore, the active mount device 4 according to this embodiment including the main body case 14, the elastic member 15, the connecting member 16, and the pressure chamber 17 constitutes the vibration isolation mechanism portion of the present invention.

  Therefore, as described above, when the hydraulic pressure supplied from the hydraulic output chamber 23 of the hydraulic pressure generator 7 is large, the pressure in the pressure chamber 17 of the active mount device 4 that is the vibration isolation mechanism increases or is accompanied by this. When the volume increases and the supplied hydraulic pressure is small, the pressure in the pressure chamber 17 decreases or the volume decreases accordingly. Therefore, the control unit 13 shown in FIG. 1 outputs a control signal to the switching valve 10 in accordance with at least one of the operating state of the internal combustion engine and the traveling state of the vehicle, whereby the air chamber 21 of the hydraulic pressure generating device 7 is output. When the air having different pressures, that is, the atmospheric pressure and the negative pressure are switched to be supplied and discharged, the hydraulic pressure supplied from the hydraulic output chamber 23 to the pressure chamber 17 of the active mount device 4 changes. In other words, it is possible to control the transmission characteristics of vibration transmitted from the vibrating body to the vehicle body. Note that what is necessary to control the vibration transmission characteristics of the internal combustion engine 1 is a force that supports the internal combustion engine 1. In some cases, the pressures of the 17 need only change, and in such cases their volume need not necessarily change.

  As described above, according to the vibration isolator of the present embodiment, the active mount device that is the vibration isolating mechanism unit and the hydraulic pressure generating device are separately provided, and the liquid is generated by switching supply and discharge between the negative pressure and the atmospheric pressure. The hydraulic pressure generated by the pressure generator is supplied to the active mount device via the liquid path so that the vibration transmission characteristics by the vibration isolation mechanism can be controlled. A large-scale negative pressure tank that stores the negative pressure is unnecessary, and unlike air, the negative pressure does not decrease due to the flow resistance in the pipe line, so that sufficient vibration isolation performance can be ensured. .

Next, 2nd Embodiment of the vibration isolator of this invention is described using FIG. The vibration isolator of FIG. 3 is similar to that of FIG. 1 of the first embodiment. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.
In the present embodiment, the specific structure of the active mount device 4 that is a vibration isolation mechanism is different from that of the first embodiment, and the hydraulic output chamber 23 of the hydraulic pressure generator 7 and the pressure chamber of the active mount device 4 are different. The difference is that a branch pipe 24 serving as a storage space is branched and connected to a liquid path 18 that communicates with the liquid passage 18. Note that the end of the branch pipe 24 is closed.

  Details of the active mounting device 4 are shown in FIG. In the portable active mount device 4 of the present embodiment, a secondary liquid chamber 25 is provided in addition to the active mount device 4 of the first embodiment. The sub liquid chamber 25 is formed below the pressure chamber 17 via a partition wall 27, and the pressure chamber 17 and the sub liquid chamber 25 communicate with each other via an orifice 26. Accordingly, the working liquid reciprocates through the orifice between the pressure chamber 17 and the sub liquid chamber 25.

  According to the vibration isolator of the present embodiment, as described above, the hydraulic pressure in the pressure chamber 17 in the active mount device 4 in accordance with the vibration of the internal combustion engine 1 or the hydraulic pressure fluctuation from the hydraulic pressure output chamber 23. , The hydraulic pressure fluctuation is transmitted to the auxiliary liquid chamber 25 through the orifice 26. Therefore, by setting the resonance characteristics of the pressure chamber 17, the sub liquid chamber 25, and the orifice 26 to a specific frequency, it resonates with the fluid pressure fluctuation from the fluid pressure output chamber 23 and enhances its vibration isolation effect. By shifting from the resonance frequency of 1, the excitation force from the internal combustion engine 1 can be attenuated.

  Further, in this embodiment, the branch pipe 24 that is the accommodation space is branched and connected from the liquid path 18, so that the anti-resonance action of the branch pipe 24 attenuates the hydraulic pressure fluctuation, that is, vibration generated in the liquid path 18. can do. In particular, when a steep hydraulic pressure fluctuation occurs with the operation of the switching valve 10, a hydraulic pressure fluctuation of a multiple component of the operating frequency of the switching valve 10, that is, a so-called higher-order hydraulic pressure fluctuation may occur. Therefore, if the frequency at which the anti-resonance action of the branch pipe 24 is obtained is set to this higher order hydraulic pressure fluctuation frequency, the higher order hydraulic pressure fluctuation can be effectively attenuated.

Accordingly, the resonance frequency of the orifice 26 of the active mount device 4 and the anti-resonance action frequency of the branch pipe 24 serving as a storage space branched and connected to the liquid path 18 are set to the hydraulic pressure fluctuation frequency band to be attenuated most. By doing so, it is possible to promote a vibration isolation effect obtained by switching between atmospheric pressure and negative pressure.
In the above-described embodiment, only the vibration isolator having an active mount device interposed between the internal combustion engine and the vehicle body side member has been described in detail. However, the vibration isolator of the present invention includes other vehicle body side members, for example, Any anti-vibration device can be applied as long as an anti-vibration mechanism is interposed between the various members and the internal combustion engine or other vibrating body.

In the above-described embodiment, only the case where the control result is not fed back has been described. However, the control result may be detected using various sensors, and the control may be performed by feeding back the result.
Also, an active mount device, that is, an orifice is provided in the liquid path that connects the pressure chamber of the vibration isolation mechanism and the hydraulic pressure output chamber of the hydraulic pressure generation device, and the resonance frequency of this orifice is adjusted to improve the vibration isolation effect. You may make it raise.
Further, the pressure of the gas used for the vibration control is not limited to the atmospheric pressure and the negative pressure, and any gas having a pressure difference can be used.

It is a schematic block diagram which shows 1st Embodiment of the vibration isolator of this invention. FIG. 2 is a cross-sectional view of the active mount device of FIG. 1. It is a schematic block diagram which shows 2nd Embodiment of the vibration isolator of this invention. FIG. 4 is a cross-sectional view of the active mount device of FIG. 3.

Explanation of symbols

1 is an internal combustion engine 2 is an engine block 3 is a crankcase 4 is an active mount device (anti-vibration mechanism)
5 is an intake line 6 is an exhaust line 7 is a hydraulic pressure generating device 8 is an atmospheric pressure introduction line 9 is a negative pressure introduction line 10 is a switching valve 11 is a hydraulic pressure generator 12 is a negative pressure tank 13 is a control unit 14 Is the body case (first connecting member)
15 is an elastic member 16 is a connecting member (second connecting member).
Reference numeral 17 denotes a pressure chamber 18, a liquid path 20, a cylinder 21, an air chamber 22, a vibration plate 23, a hydraulic output chamber 24, a branch pipe (accommodating space).
25 is a secondary liquid chamber (liquid chamber)
26 is an orifice

Claims (4)

  A first connecting member connected to the vibrating body; a second connecting member connected to the vehicle body side member; an elastic member provided between the first connecting member and the second connecting member; An anti-vibration mechanism provided with a pressure chamber that is provided between the first connecting member and the second connecting member and changes in volume or pressure according to the supplied hydraulic pressure; An air chamber in which at least one of volume or pressure changes according to fluctuations in atmospheric pressure, switching means for supplying atmospheric pressures having different pressures to the air chamber, and the volume or pressure of the air chamber adjacent to the air chamber A fluid pressure generating device having a fluid pressure output chamber that outputs a fluid pressure corresponding to at least one of the change, and a fluid communicating with the pressure chamber of the vibration isolation mechanism and the fluid pressure output chamber of the fluid pressure generating device The road and the operating state of the internal combustion engine or the traveling state of the vehicle By outputting a control signal to the switching means according to at least one of them, the fluid pressure supplied to the pressure chamber is adjusted by supplying and discharging air having different pressures in the air chamber, and vibration from the vibrating body is adjusted. An anti-vibration device comprising control means for controlling transfer characteristics.   The vibration isolator is provided with a liquid chamber different from the pressure chamber, and an orifice provided between the liquid chamber and the pressure chamber.   The vibration isolator according to claim 1 or 2, wherein the liquid path includes an accommodation space branched from the liquid path.   4. The vibration isolation device according to claim 1, wherein resonance characteristics of the pressure chamber, the hydraulic pressure output chamber, and the liquid path are adjusted so as to coincide with a required vibration isolation frequency region. 5. apparatus.

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