JP2008087590A - Vehicle body supporting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exert a vibration restraining effect to a supported mass even when a natural frequency of a vibration system is changed. <P>SOLUTION: This vehicle body supporting system 10 comprises a pair of vehicle body supporting devices 1c<SB>1</SB>and 1c<SB>2</SB>. A first air chamber 4A<SB>1</SB>of the first vehicle supporting device 1c<SB>1</SB>, and a second air chamber 4B<SB>2</SB>of the second vehicle body supporting device 1c<SB>2</SB>are connected with each other via a first gas passage 7<SB>1</SB>. Also, a second air chamber 4B<SB>1</SB>of the first vehicle supporting device 1c<SB>1</SB>, and a first air chamber 4A<SB>2</SB>of the second vehicle body supporting device 1c<SB>2</SB>are connected with each other via a second gas passage 7<SB>2</SB>. A first gas passage opening/closing means 8<SB>1</SB>is provided to the first gas passage 7<SB>1</SB>, and a second gas passage opening/closing means 8<SB>2</SB>is provided to the second gas passage 7<SB>2</SB>. The first gas passage opening/closing means 8<SB>1</SB>, and the second gas passage opening/closing means 8<SB>2</SB>are opened/closed at a predetermined frequency by a vibration control device 40, respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle body support system used to support an automobile, a bus, a truck or other vehicles.

  Suspension devices (suspensions) for vehicles and railway vehicles, and structures that do not wish to transmit vibrations or shocks are supported via a buffer mechanism. In Patent Document 1, the inside of a cylinder is divided into two chambers by a piston, and a valve composed of two metal stays is interposed in a passage provided in the piston and communicating with the two chambers. An air spring is disclosed in which an input having the same frequency as the self-excited frequency is not transmitted onto the spring. When this air spring is used in a shock absorber provided in a suspension device of a vehicle, resonance amplification can be avoided by matching the resonance frequency on the vehicle spring with the self-excited frequency of the valve. In addition, by setting the self-excited vibration frequency of the valve to an input frequency that is not desired to be transmitted to the vehicle, the input can be prevented from being transmitted to the vehicle.

US Pat. No. 4,635,909

  By the way, the magnitude | size of the mass supported by the vehicle which drive | works a road and the suspension apparatus (suspension apparatus) of a railway vehicle may change. For example, in a vehicle suspension system, the mass supported depends on the number of passengers and the load. As a result, the natural frequency of the vibration system changes. When the natural frequency of the vibration system changes, the suppression function of resonance amplification decreases.

  Therefore, the present invention has been made in view of the above, and when the natural frequency of the vibration system formed by the mass of the vehicle body support device and the vehicle body supported by the vehicle body changes while supporting the load of the vehicle body However, it aims at providing the vehicle body support system which can exhibit the vibration suppression effect with respect to a vehicle body.

  In order to achieve the above object, a vehicle body support system according to the present invention is provided between a vehicle body and a wheel of a vehicle, supports the vehicle body, and includes a first air chamber filled with gas, and The vehicle body is disposed between the second air chamber, the first air chamber, and the second air chamber, and reciprocates relative to the first air chamber and the second air chamber. A vehicle body support device comprising: vibration input means for inputting at least one of vibration from the wheel or vibration from the wheel into the first air chamber and the second air chamber; and the pair of vehicle body support devices 1, the first gas passage connecting the first air chamber provided in one of the vehicle body support devices and the second air chamber provided in the other vehicle body support device, and the second air provided in one of the vehicle body support devices. Connecting the chamber and the first air chamber of the other vehicle body support device Are attached to a third gas passage that interconnects the two gas passages, the first gas passage, and the second gas passage, and the input means includes the first air chamber and the second air chamber. Gas passage opening and closing means for opening and closing the first gas passage and the second gas passage at a predetermined frequency corresponding to a frequency when reciprocating relative to the air chamber. .

  The vehicle body support system includes an air chamber filled with a gas such as air or nitrogen, and input means for inputting vibration to the air chamber by reciprocating relative to the air chamber. Opens and closes the gas passage connected to the air chamber at a predetermined frequency corresponding to the frequency when reciprocating relative to the air chamber. With this configuration, the vehicle body support device functions as a frequency filter having a gain of 0 for the predetermined frequency and a gain of approximately 1.0 at other frequencies. That is, the vibration of the predetermined frequency is cut off by the vehicle body support device and hardly transmitted to the vehicle body supported by the vehicle body support device. Thus, when the natural frequency of the vibration system constituted by the vehicle body support device and the vehicle body supported by the vehicle body change device, the frequency for opening and closing the gas passage connected to the air chamber according to the change of the natural frequency. By changing the above, it is possible to exhibit the effect of suppressing the vibration of the vehicle body to be supported while supporting the static load.

  In the vehicle, it is preferable that the spring constant of the vehicle body support device can be changed according to the traveling state of the vehicle in order to obtain steering stability suitable for the traveling state of the vehicle such as straight traveling and turning traveling. In the vehicle body support system, a first gas passage that stably supports a load by the first air chamber and the second air chamber, and communicates the first air chamber and the second air chamber with each other in the pair of shock absorbers. And a second gas passage. As a result, the spring constant when the pair of shock absorbers operates in the opposite phase is larger than the spring constant when operated in the same phase. By arranging such a pair of shock absorbers on the left and right or front and rear of the vehicle, the spring constant of the shock absorber can be easily changed according to the traveling state of the vehicle.

  As in the vehicle body support system according to the next aspect of the present invention, in the vehicle body support system, the pair of shock absorbers may be a pair of shock absorbers attached to the left and right of the vehicle.

  As in the vehicle body support system according to the next aspect of the present invention, in the vehicle body support system, the pair of shock absorbers may be a pair of shock absorbers attached on the same side of the vehicle and front and rear.

  As in the vehicle body support system according to the next aspect of the present invention, in the vehicle body support system, the pair of shock absorbers may be a pair of shock absorbers attached to diagonal positions of the vehicle.

  As in the vehicle body support system according to the next aspect of the present invention, in the vehicle body support system, vibration detection means for detecting vibration of at least one of an on-spring or an unspring of the vehicle is attached to the vehicle, and the vibration detection means The vibration component detected in step (b) above the power of the predetermined vibration is selected as the frequency of the vibration of the transmission suppression target, and the frequency of the selected vibration of the transmission suppression target is an integer multiple or a fraction of an integer, The third gas passage may be opened and closed.

  As in the vehicle body support system according to the present invention, in the vehicle body support system, a vibration component detected by the vibration detection means and having a predetermined power or higher is selected as the vibration suppression target vibration frequency, Depending on the magnitude of the vibration power, the ratio between the opening time and the closing time when the gas passage opening and closing means is opened and closed may be changed.

  As in the vehicle body support system according to the present invention, in the vehicle body support system, a vibration component having a predetermined power or higher is selected as a vibration frequency to be transmitted and a plurality of frequencies are selected in descending order of vibration power. The gas passage opening / closing means may be opened / closed at a frequency that is selected and multiplied by an integer multiple or a fraction of an integer of the selected frequencies.

  As in the vehicle body support system according to the next aspect of the present invention, in the vehicle body support system, a plurality of frequencies are selected from the set multiple frequencies in descending order of the vibration power, and the power of the selected frequency is set to the magnitude of the selected frequency. Accordingly, the ratio between the opening time and the closing time when opening and closing the gas passage opening / closing means for each frequency may be changed.

  As described above, in the vehicle body support system according to the present invention, while supporting the load of the vehicle body, even when the natural frequency of the vibration system formed by the mass of the vehicle body support device and the vehicle body supported by the vehicle body changes, The effect of suppressing vibration to the vehicle body can be demonstrated.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, or substantially the same, so-called equivalent ranges.

  In this embodiment, a gas passage connected to an air chamber for supporting a load by being filled with a gas such as air or nitrogen is periodically opened and closed, and a part of the gas filled in the air chamber is opened to the atmosphere. Utilizing the characteristic that the spring rigidity of the air chamber is reduced with respect to an external force having the same cycle as the frequency for opening and closing the gas passage by being released to the inside or another air chamber. As a result, even when the natural frequency of the vibration system changes, the vibration suppressing effect on the supported mass (the mass of the vehicle body) is exhibited. Here, “release” means that the gas in the air chamber is released to the outside of the air chamber when there is a single air chamber, and input means (for example, a piston) in the case of two air chambers. This means that the gas in the high-pressure side air chamber divided in the above moves to the low-pressure side air chamber.

  When there is a single air chamber that supports the load (mass of the vehicle body), a gas passage opening / closing means (for example, an opening / closing valve) provided in a gas passage for releasing the gas filled in the air chamber to the outside is provided. A part of the gas in the air chamber is released to the outside of the air chamber by opening and closing the gas passage opening / closing means at a predetermined frequency corresponding to the frequency at which the supported mass (the mass of the vehicle body) vibrates.

  When there are two air chambers supporting the load, the two air chambers filled with gas to support the load and the reciprocating motion relative to the two air chambers cause vibration. Is input to the two air chambers, a gas passage communicating the two air chambers, and a gas passage opening / closing means (for example, an opening / closing valve) provided in the gas passage. Then, the gas passage opening / closing means is opened / closed at a predetermined frequency corresponding to the frequency when the input means reciprocates relative to the two air chambers.

  1-1 is explanatory drawing which shows the structure of the vehicle body support apparatus which concerns on this embodiment. FIG. 1-1 illustrates an example in which the vehicle body support device 1 according to the present embodiment is applied to a suspension device 20 provided in a vehicle 100. 1-2 is explanatory drawing which shows the other example of a gas channel | path opening / closing means. FIGS. 2-1 to 2-4 are explanatory views illustrating other configuration examples of the vehicle body support device according to the present embodiment. The vehicle body support device 1 according to the present embodiment functions as a shock absorber for the suspension device 20 provided in the vehicle 100, that is, a structure including a spring and vibration damping means (for example, a damper). In the present embodiment, the support target structure of the vehicle body support device 1 is the vehicle body 100 </ b> B of the vehicle 100.

  The vehicle body support device 1 includes a cylinder 2, a piston 3 provided inside the cylinder 2 that reciprocates, a gas passage 7, and a gas passage opening / closing means 8 provided in the gas passage 7. An air chamber 4 is provided in the cylinder 2, and the air chamber 4 is filled with a gas pressurized to a predetermined pressure (air in this embodiment). Note that pressure adjusting means such as a pump may be attached to the air chamber 4 to supply gas into the air chamber 4.

  The air chamber 4 is partitioned by the piston 3 into a first air chamber 4A and a second air chamber 4B. Here, the piston 3 is reciprocated relative to the air chamber 4 to thereby attach the vehicle body support device 1 to the air chamber 4 (the first air chamber 4A and the second air chamber 4B) (this embodiment). In the embodiment, it functions as an input means for inputting vibrations of the vehicle body 100B of the vehicle 100 and the lower arm 21L) of the suspension device 20. Note that the first air chamber 4A and the second air chamber 4B are configured separately from each other by a flexible material such as a rubber film, for example, and between the first air chamber 4A and the second air chamber 4B. The piston 3 may be sandwiched between the two.

  A piston rod 5 is attached to the piston 3. One end of the piston rod 5 is provided with a bracket 5B that is attached to the lower arm 21L of the suspension device 20 to which the vehicle body support device 1 is attached. The piston 3 is attached to the lower arm 21L of the suspension device 20 via the piston rod 5 and the bracket 5B. The piston 3 reciprocates in the cylinder 2 together with the lower arm 21L when the lower arm 21L moves in the direction of arrow G in FIG.

  As shown in FIG. 1A, a vehicle body acceleration sensor 30 is attached to a vehicle body 100 </ b> B of the vehicle 100. The acceleration of the vehicle body 100B (acceleration on the spring of the vehicle 100) in the direction orthogonal to the road surface GL can be obtained by the vehicle body acceleration sensor 30, and the vibration frequency on the spring can be obtained based on this. The suspension device acceleration sensor 31 is attached to the lower arm 21L of the suspension device 20. By detecting the operation of the lower arm 21L by the suspension device acceleration sensor 31, the unsprung acceleration of the vehicle 100 in the direction orthogonal to the road surface GL can be obtained, and based on this, the frequency of unsprung vibration can be obtained. . Thus, the vehicle body acceleration sensor 30 and the suspension device acceleration sensor 31 each function as vibration detection means. More specifically, the vehicle body acceleration sensor 30 functions as sprung vibration detection means for detecting vibration on the spring of the vehicle 100, and the suspension acceleration sensor 31 is a spring that detects vibration under the spring of the vehicle 100. It functions as a lower vibration detection means.

  A stroke sensor 32 is attached to the lower arm 21 </ b> L of the suspension device 20. The vehicle height of the vehicle 100 can be detected by the stroke sensor 32. The stroke sensor 32 can know the stroke of the vehicle body support device 1. As a result, when the vehicle height of the vehicle 100 changes due to changes in passengers or loading capacity, air is further filled into the air chamber 4 or a gas spring 6 described later, or air is released from the air spring 6 or the like. For example, the vehicle height of the vehicle 100 can be kept constant.

  As illustrated in FIG. 1A, a gas pump 7 connected to the air chamber 4 may be connected to a first pump P <b> 1 as a gas supply unit for the air chamber 4. Moreover, it is desirable to connect the 2nd pump P2 to the gas spring 6 as a gas supply means. Further, the vehicle body support device 1 can include an air chamber pressure sensor 33 that measures the pressure in the air chamber 4 and a gas spring pressure sensor 34 that measures the pressure in the gas spring 6. Further, since the volume of the gas spring 6 can be obtained based on the detection value of the stroke sensor 32, the gas is determined based on the detection value of the stroke sensor 32 and the pressure in the gas spring 6 obtained from the gas spring pressure sensor 34. The amount of air in the spring 6 can be known. Thus, the amount of gas filled in the air chamber 4 or the gas spring 6 can be detected using the air chamber pressure sensor 33, the stroke sensor 32, and the gas spring pressure sensor 34.

  When the amount of gas in the air chamber 4 or the amount of gas in the gas spring 6 detected by the gas amount detection means becomes equal to or less than a predetermined threshold, the vehicle body support device 1 maintains the vehicle body 100B at a predetermined vehicle height. Can not. In this case, gas is replenished into the air chamber 4 or the gas spring 6 using the first pump P1 or the second pump P2. As a result, the vehicle body support device 1 maintains the ability to maintain the vehicle height of the vehicle body 100B, and allows the vehicle 100 to travel safely.

  A bottom plate 9 is provided as a sealing member at a portion where the piston rod 5 projects from the cylinder 2. The piston rod 5 is taken out through the through hole 9H of the bottom plate 9. The through hole 9H is provided with a seal 9S, which reduces the amount of gas in the second air chamber 4B that leaks from the gap between the piston rod 5 and the through hole 9H.

  In the present embodiment, a gas spring 6 that is a third air chamber is provided as an elastic body between the bracket 5B and the bottom plate 9 (that is, between the bracket 5B and the second air chamber 4B). The main function of the gas spring composed of the first air chamber 4A and the second air chamber 4B of the vehicle body support device 1 is to give the vehicle body support device 1 frequency selectivity. The vehicle body support device 1 has a mass obtained by subtracting the force due to the pressure in the second air chamber 4B from the load support force due to the pressure in the gas spring 6 and the pressure in the first air chamber 4A. Support. Thus, since the force by the 2nd air chamber 4B exists, the additional gas spring 6 is needed. Instead of the gas spring 6, an elastic body such as a coil spring or a leaf spring may be used to support the load of the vehicle body 100B.

  Like the vehicle body support device 1a shown in FIG. 2A, the vehicle body support device 1a itself does not include the gas spring 6 (see FIG. 1), but uses another elastic body (for example, a coil spring). Thus, the mass of the vehicle body 100B to which the vehicle body support device 1 is attached can be supported. Further, as in the vehicle body support device 1b shown in FIG. 2-2, the pressure in the air chamber 4 is maintained at a predetermined level by supplying the gas to the air chamber 4 in real time by the pump 10 which is a gas supply means. If possible, the air chamber 4 can be single without using another spring device.

  Note that the vehicle body support devices 1, 1 a and the like according to the present embodiment have a stopper member 19 attached to a position facing the piston 3 on the vehicle body attachment side inside the vehicle body support devices 1, 1 a and the like. . As a result, even if the air inside the gas spring 6 or the first air chamber 4A escapes and it becomes impossible to support the sprung mass of the vehicle 100 by the air pressure support, the spring is stopped by the stopper member 19. The upper mass can be supported. As a result, even if an air leak occurs from the gas spring 6 or the first air chamber 4A, the stopper member 19 can directly contact the piston 3 to support the mass of the vehicle body 100B. You can travel. As a result, even if an air leak occurs from the gas spring 6 or the first air chamber 4A, the vehicle 100 can reach a repair shop or the like by traveling at a low speed.

  A lower arm 21L constituting the suspension device 20 of the vehicle 100 has a first end 21LA attached to the vehicle body 100B, and a wheel bracket 22 for attaching a wheel 24 attached to the second end 21LB. The wheel 24 is attached to the wheel bracket 22 via the axle 23. Here, the wheel bracket 22 is attached to the vehicle body 100B by the lower arm 21L and the upper arm 21U (the vehicle body attachment portion of the upper arm 21U is omitted).

  The vehicle body support device 1 and the lower arm 21L of the suspension device 20 are connected via a bracket 5B attached to the piston rod 5 of the vehicle body support device 1. When the wheel 24 moves in the direction of arrow G due to an impact received from the road surface GL, the lower arm 21L swings around the first end 21LA. As a result, the piston 3 of the vehicle body support device 1 reciprocates in the cylinder 2 together with the lower arm 21L.

  Due to the reciprocating motion of the piston 3, the volumes of the first air chamber 4A and the second air chamber 4B change. For example, when the lower arm 21L is raised and the overall length of the vehicle body support device 1 is shortened, the piston 3 is also raised. In this case, the volume of the first air chamber 4A decreases and the volume of the second air chamber 4B increases. Accordingly, the first air chamber 4A and the second air chamber 4B generate a force (repulsive force) that pushes back the piston 3 in the direction opposite to the moving direction of the piston 3. Thus, the vehicle body support device 1 functions as a gas spring, and absorbs the impact that the wheel 24 receives from the road surface GL, or supports the mass of the vehicle body 100B.

  In the present embodiment, the first air chamber 4A and the second air chamber 4B are connected by a gas passage 7 through which the gas filled therein passes. The gas passage 7 is provided with an opening / closing valve 8V constituting the gas passage opening / closing means 8. That is, the on-off valve 8V is provided between the first air chamber 4A and the second air chamber 4B. The gas passage opening / closing means 8 includes an opening / closing valve 8V and an actuator (for example, a piezoelectric element such as a solenoid or a piezoelectric element, or an ultrasonic motor) 8A that opens / closes the opening / closing valve 8V by the vibration control device 40. The When the on-off valve 8V is closed by the actuator 8A, the first air chamber 4A and the second air chamber 4B are shut off, and no gas enters and exits between the first air chamber 4A and the second air chamber 4B. On the other hand, when the on-off valve 8V is opened by the actuator 8A, the first air chamber 4A and the second air chamber 4B communicate with each other, and between the first air chamber 4A and the second air chamber 4B via the gas passage 7. Gas can enter and exit.

  Here, the gas passage opening / closing means 8 a may be attached to the communication hole 7 a provided in the piston 3 as shown in FIG. In this case, the communication hole 7a becomes a gas passage. As described above, when the gas passage opening / closing means 8a is mounted in the piston 3 or the piston rod 5, it is not necessary to provide the gas passage opening / closing means or the gas passage outside the vehicle body support device 1. Can be made compact. Further, since the gas passage connecting the first air chamber 4A and the second air chamber 4B is not arranged outside the vehicle body support device 1, the gas passage is not subject to attacks such as stepping stones while the vehicle 100 is traveling. Therefore, the reliability of the vehicle body support device 1 is improved.

  The vehicle body support device 1 according to the present embodiment functions as a notch filter, thereby reducing the stiffness of the spring against the vibration of the notch frequency, thereby suppressing the vibration of the notch frequency from being transmitted to the vehicle body 100B. To do. Thereby, resonance amplification generated in the vibration system of the vehicle 100 can be avoided, or unpleasant vibration transmitted to the vehicle body 100B can be suppressed. Thus, the vehicle body support device 1 according to the present embodiment has an effect of suppressing the vibration transmitted to the vehicle body 100B. That is, the vehicle body support device 1 according to the present embodiment exhibits an action like a vibration damping device.

  Here, the notch filter is a filter having a function of removing vibrations of a specific frequency and passing vibrations in other frequency bands. The vehicle body support device 1 according to the present embodiment functions like a notch filter, thereby suppressing transmission of vibration that vibrates at a specific frequency (or frequency band). That is, transmission of vibration that vibrates at a specific frequency (or a plurality of dominant frequencies) is suppressed between the wheel 24 (FIG. 1-1) and the vehicle body 100B.

  Here, the notch frequency is a frequency of vibration removed by the notch filter. For example, the notch frequency is the natural frequency of the vibration system of the vehicle 100 including the vehicle body 100B and the vehicle body support device 1. When vibration having such a frequency is input to the vehicle body 100B, the vibration of the vehicle body 100B is amplified by the resonance phenomenon (resonance amplification). Therefore, it is necessary to prevent such vibration from being transmitted to the vehicle body 100B. That is, the vibration having the natural frequency is vibration having a frequency at which transmission to the vehicle body 100B is desired to be suppressed. If the notch frequency of the vehicle body support device 1 according to this embodiment is the natural frequency, the vibration of the natural frequency can be suppressed from being transmitted to the vehicle body 100B, so that the resonance amplification phenomenon can be suppressed.

  In order to reduce the spring rigidity of the vehicle body support device 1 against vibration of the notch frequency, the notch frequency (the frequency at which the piston 3 reciprocates relative to the air chamber 4 is reciprocated by the theory of Fourier series). It is only necessary to open and close the gas passage opening / closing means 8 not only at a predetermined frequency) but also at a harmonic frequency that is an integral multiple thereof, or at a frequency that is a fraction of an integer. As a result, the vehicle body support device 1 according to the present embodiment has a low transmission rate at the notch frequency, and vibrations other than the notch frequency support the load with a high transmission rate compared to the notch frequency. Become. This is an extremely important characteristic for supporting a static load (with a vibration frequency corresponding to 0).

  Next, the vehicle body support device disclosed in FIGS. 2-3 and 2-4 will be described. In a vehicle body support device 1c shown in FIG. 2-3, a first air chamber 4A and a second air chamber 4B in which gas is confined are disposed to face each other, and these are housed in a case (housing) 11. In the present embodiment, the first air chamber 4A is disposed on the vehicle body 100B side of the vehicle 100 to which the vehicle body support device 1c is attached. For this reason, the second air chamber 4B is disposed at a position below the first air chamber 4A in the vertical direction. Here, the vertical direction refers to the direction of action of gravity, and the lower position refers to the lower side of the ground (in the direction of arrow G in FIG. 2-3).

  The first air chamber 4A and the second air chamber 4B arranged to face each other sandwich a load transmission member 3A that is a vibration input means. A lower arm 21L constituting the suspension device 20 (see FIG. 1) is attached to the load transmission member 3A. The lower arm 21 </ b> L passes through the through hole 12 provided in the case 11. The load transmitting member 3A transmits the force input from the road surface via the lower arm 21L to the first air chamber 4A and the second air chamber 4B. This force is transmitted to the gas in the first air chamber 4A and the second air chamber 4B, and is absorbed and relaxed by compressing the gas in the first air chamber. As a result, the force transmitted to the vehicle body 100B is relaxed and supported. As described above, in the vehicle body support device 1c, when a load is applied, the volume change of the first air chamber 4A is opposite to the volume change of the second air chamber 4B. That is, when the volume of the first air chamber 4A decreases, the volume of the second air chamber increases.

Further, as shown in Figure 2-3, the load bearing area S1 of the portion where the first supporting portion CP ₁ of the first air chamber 4A and the load transmission member 3A is in contact, the second air chamber 4B and the load-transfer member 3A the second supporting portion CP ₂ is greater than the load supporting area S2 of the portion that contacts the (S1> S2). Here, S1: S2 is suitably about 2: 1 to 10: 1 (the same applies hereinafter). That is, the pressure receiving area where the first air chamber 4A receives pressure from the load transmitting member 3A is larger than the pressure receiving area where the second air chamber 4B receives pressure from the load transmitting member 3A.

  As a result, the force F1 by which the first air chamber 4A pushes the load transmitting member 3A is larger than the force F2 by which the second air chamber 4B pushes the load transmitting member 3A. As a result, the load transmitted from the lower arm 21L to the load transmission member 3A can be supported by the vehicle body support device 1c alone without using a separate load supporting spring or gas spring. At the same time, the vehicle body support device 1c can suppress the vibration of the notch frequency from being transmitted to the vehicle body 100B by opening and closing the gas passage opening / closing means 8 at the notch frequency.

  In the vehicle body support device 1c, the load transmitting member 3A is sandwiched between the first air chamber 4A and the second air chamber 4B that are arranged to face each other. Then, the lower arm 21L penetrating the through hole 12 is attached to the load transmitting member 3A, and the lower arm 21L moves in the through hole 12, so that the vehicle body support device 1c absorbs the shock and relaxes. In the conventional shock absorber, the point of action of the load is outside the case. However, in the vehicle body support device 1c according to this embodiment, the point of action of the load from the lower arm 21L can be set in the case 11 of the vehicle body support device 1c. . As a result, the overall length of the vehicle body support device 1c can be designed shorter than before. Thereby, the suspension apparatus 100 can be made compact.

Further, as shown in Figure 2-3, this body supporting apparatus 1c, an internal of the vehicle body supporting apparatus 1c, the first support portion CP ₁ facing the position of the load transmission member 3A at the vehicle attachment side, A stopper member 19 is attached. The stopper member 19 is located on the inner side of the first air chamber 4A and on the attachment side of the vehicle body support device 1c to the vehicle body 100B (that is, on the inner side of the first air chamber 4A and in the direction of action of gravity (arrow G in FIG. 2-3). It is provided on the opposite side).

Incidentally, the stopper member 19 may be provided in the first support portion CP ₁ side of the load transmission member 3A, the vehicle body 100B of the inner and body supporting apparatus 1c of the first support portion CP ₁ side and the first air chamber 4A You may provide in both of the attachment side. That is, the stopper member 19 is an inner casing 11 of the vehicle body supporting apparatus 1c, the first supporting portion CP ₁ of the load transmission member 3A, it can be provided between the vehicle body 100B. The stopper member 19 is made of an elastic material, and generates a repulsive force when compressed in the operation direction of the load transmission member 3A (that is, the operation direction of the vehicle body support device 1c). For the stopper member 19, for example, an elastic material such as rubber or resin can be used, or a helical spring, a disc spring, a gas spring, or the like can be used.

Even if the air in the first air chamber 4A escapes and the sprung mass of the vehicle 100 cannot be supported by the air pressure support in the vehicle body support device 1c, the vehicle body support device 1c is stopped by the stopper member 19. The sprung mass can be supported. Thus, even emergency air leakage from the first air chamber 4A or the like occurs, the stopper member 19 is in direct contact with the first supporting portion CP ₁ of the load-transfer member 3A, it is possible to support the mass of the vehicle body 100B, At least the vehicle body 100B can travel at a low speed. As a result, even if air leaks from the air chamber, it can reach a repair shop or the like by low-speed traveling. Thus, it is preferable to provide the stopper 19 in order to improve the reliability of the vehicle 100 provided with the vehicle body support apparatus 1c.

2-4 is explanatory drawing which shows the structure of the other buffering device applicable to the suspension apparatus which concerns on this embodiment. The vehicle body support device 1d has the same configuration as that of the vehicle body support device 1c, but the load transmission member 3B, which is a vibration input means, passes through the first air chamber 4A and the second air chamber 4B that are disposed to face each other. . The first supporting portion CP ₁ of the load-transfer member 3B is brought into contact with the first air chamber 4A in the opposite side of the opposing surface OP. The second supporting portion CP ₂ of the load transmission member 3B contacts the second air chamber 4B on the opposite side of the opposing surface OP. The first supporting portion CP ₁ and the load supporting area S1 at the contact portion between the first air chamber 4A is larger than the load supporting area S2 at the contact portion between the second supporting portion CP ₂ and the second air chamber 4B. In the vehicle body support device 1d, when a load is applied, the volume change of the first air chamber 4A is opposite to the volume change of the second air chamber 4B. Similarly to the vehicle body support devices 1 and 1c described above, the vehicle body support device 1d can suppress the vibration of the notch frequency from being transmitted to the vehicle body 100B by opening and closing the gas passage opening / closing means 8 at the notch frequency.

  2-5 is explanatory drawing which shows the structure of the vehicle body support apparatus applicable to the suspension apparatus which concerns on this embodiment. In the vehicle body support device 1e, one end portion (upper end portion) of the device housing 2e is connected to the vehicle body 100B, and a bracket member 5e extending in a direction opposite to the vehicle body 100B (downward) is connected to the lower arm 21L of the suspension device. Connected. In the vehicle body support device 1e, the first air chamber 4A and the second air chamber 4B are configured by roll-type air springs that are partitioned by flexible members 9A and 9B, respectively. In the vehicle body support device 1e, a cover (second air chamber cover) 3e of the second air chamber 4A connected to the bracket member 5e is used as vibration input means. That is, the relative vibration between the lower arm 21L and the vehicle body 100B is input to the cover 3e of the second air chamber 4B via the bracket member 5e. As described above, the second air chamber cover 3e of the vehicle body supporting device 1e functions as a vibration input means for the air chamber of the vehicle body supporting device, and the piston 3 of the vehicle body supporting device 1 shown in FIG. This is the same as the load transmission member 3A of the vehicle body support device 1c shown in FIG.

  The vehicle body support device 1c shown in FIG. 2-3 arranges the first air chamber 4A and the second air chamber 4B at positions facing the load transmission member 3A, and the first air chamber 4A and the second air chamber 4B. The suspension device is stabilized by pressing the chamber 4B against each other. On the other hand, the vehicle body support device 1e shown in FIG. 2-5 includes a second air chamber cover 3e in which the first air chamber 4A and the second air chamber 4B are integrated with a bracket member 5e connected to the lower arm 21L of the suspension device. By pushing, the same effect as the vehicle body support device 1c shown in FIG. Here, in the vehicle body support device 1e, the bracket member 5e and the second air chamber cover 3e serve as vibration input means. From the space utilization efficiency, the vehicle body support device 1e shown in FIG. 2-5 is more advantageous than the vehicle body support device 1c shown in FIG. 2-5 is also suitable for a so-called strut-type suspension device.

  In the vehicle body support device 1 e, the first air chamber 4 </ b> A and the second air chamber 4 </ b> B are connected by the gas passage 7. A gas passage opening / closing means 8 is provided in the gas passage 7. In the vehicle body support device 1e, the gas passage opening / closing means 8 has a frequency corresponding to the vibration characteristics detected by the vibration detection means (for example, the vehicle body acceleration sensor 30, the suspension acceleration sensor 31, see FIG. 1-1). A notch frequency is created by opening and closing the on-off valve 8V, and transmission of vibration components having the same frequency is suppressed. That is, the vehicle body support device 1e has an advantage that the effect of suppressing vibration transmission is hardly deteriorated by following the vibration characteristics that change every moment.

  2-6 is explanatory drawing which shows the structure of the vehicle body support apparatus applicable to the suspension apparatus based on this embodiment. This vehicle body support device 1f is the same as the vehicle body support device 1e shown in FIG. 2-5, but the inner wall surface of the first air chamber 4A uses the inner wall surface of the outer cylinder 2A, and the second air chamber The inner wall surface is configured using the inner wall surface of the inner cylinder 3f. The outer cylinder bottom 10 is provided with a through hole 11 through which the inner cylinder 3 passes.

  A flexible member 9A constituting the first air chamber 4A is provided between the outer cylinder 2A and the inner cylinder 3f, and a second air chamber 4B is provided between the inner cylinder 3f and the outer cylinder bottom 10. A flexible member 9B is provided. In the vehicle body support device 1f, the vibration input means includes an inner cylinder 3f and a bracket 5f connected thereto.

  In the vehicle body support device 1f, a first stopper member 19A is provided on the vehicle body attachment side of the outer cylinder 2A, and a second stopper member 19b is provided on the outer cylinder bottom portion 10. A gas passage 7 that connects the first air chamber 4A and the second air chamber 4B is formed at the center of the first stopper member 19A and the second stopper member 19B. A gas passage opening / closing means 8 is provided in the gas passage 7. In this vehicle body support device 1f, the gas passage opening / closing means 8 has a frequency corresponding to the vibration characteristics detected by the vibration detection means (for example, the vehicle body acceleration sensor 30, the suspension device acceleration sensor 31, see FIG. 1-1). A notch frequency is created by opening and closing the provided on-off valve 8V, and transmission of vibration components having the same frequency is suppressed. That is, the vehicle body support device 1f has an advantage that the effect of suppressing vibration transmission is hardly deteriorated by following the vibration characteristics that change every moment. Here, even if the first air chamber 4A and the second air chamber 4B are not geometrically opposed to each other, the principle of the present invention is applied to the air spring paired in a mechanically opposed relationship. Can be applied as well.

FIG. 3 is a conceptual diagram showing a state in which the vehicle body support device according to the present embodiment is arranged in a vehicle. FIG. 3 shows an example in which the vehicle body support device 1c shown in FIG. The forward direction of the vehicle 100 is the direction indicated by the arrow L in FIG. In this vehicle 100, vehicle body support devices 1c ₁ , 1c ₂ , 1c ₃ , 1c ₄ are disposed at the positions of the right front wheel, the left front wheel, the right rear wheel, and the left rear wheel, respectively. The vehicle body support devices 1c ₁ , 1c ₂ , 1c ₃ , 1c ₄ have gas passage opening / closing means 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ provided in the gas passages 7 ₁ , 7 ₂ , 7 ₃ , 7 _4. The vibration control device 40 opens and closes at a predetermined frequency, thereby suppressing transmission of vibration at the predetermined frequency as described above. Next, the vibration control device 40 of the vehicle body support device 1 according to the present embodiment will be described.

  FIG. 4 is an explanatory diagram showing the configuration of the vibration control device according to the present embodiment. The vibration control device 40 includes a CPU (Central Processing Unit) 40P, a storage unit 40M, an input port 44, and an output port 45.

  The CPU 40 </ b> P of the vibration control device 40 includes a frequency setting unit 41, a communication time setting unit 42, and a valve control unit (gas passage opening / closing means control unit) 43. These are the parts that execute the vibration control according to the present embodiment. The frequency setting unit 41, the communication time setting unit 42, and the valve control unit 43 of the vibration control device 40 are connected via an input port 44 and an output port 45. Accordingly, the frequency setting unit 41, the communication time setting unit 42, and the valve control unit 43 included in the vibration control device 40 are configured to exchange control data with each other or to issue a command to one side. The

  The CPU 40P and the storage unit 40M are connected via an input port 44 and an output port 45. Accordingly, the vibration control device 40 can store data in the storage unit 40M, and can use data, computer programs, and the like stored in the storage unit 40M.

  Sensors for acquiring information necessary for controlling the vehicle body support device 1 such as the vehicle body acceleration sensor 30 and the stroke sensor 32 are connected to the input port 44. Thereby, CPU40P can acquire information required for control of body support device 1. The output port 45 is connected to a control object necessary for vibration control, that is, an actuator 8A for controlling opening / closing of the on-off valve 8V constituting the gas passage opening / closing means 8. With such a configuration, based on the output signals from the sensors, the CPU 40P can open and close the on-off valve 8V constituting the gas passage opening / closing means 8 at a predetermined frequency.

  The storage unit 40M stores a computer program, data, and the like including a vibration control processing procedure according to the present embodiment. Here, the storage unit 40M can be configured by a volatile memory such as a RAM (Random Access Memory), a nonvolatile memory such as a flash memory, or a combination thereof.

  The computer program may be capable of realizing the vibration control processing procedure according to the present embodiment in combination with a computer program already recorded. The vibration control device 40 may realize the functions of the frequency setting unit 41, the communication time setting unit 42, and the valve control unit 43 using dedicated hardware instead of the computer program. Next, control of the vehicle body support device 1 according to the present embodiment will be described. In the following description, please refer to FIGS.

  FIG. 5 is a functional block diagram when executing the Fourier analysis used in the present embodiment. 6-9 is a figure for demonstrating the example of control of the vehicle body support apparatus which concerns on this embodiment. In the following description, in the control of the vehicle body support device 1 according to the embodiment, for example, an example of suppressing the vibration component of the dominant frequency among the vibration components of the vehicle body 100B will be described. In this case, the frequency setting unit 41 sets a vibration frequency (notch frequency) that blocks transmission to the vehicle body 100B. In the present embodiment, the frequency setting unit 41 acquires the vibration component of the vehicle body 100B based on the acceleration of the vehicle body 100B acquired from the vehicle body acceleration sensor 30 (acceleration on a spring). The acquired vibration of the vehicle body 100B is, for example, as shown in FIG.

  In order to suppress vibration transmitted from the road surface to the vehicle body 100B via the vehicle body support device 1 and the like and to provide a comfortable ride for the passenger of the vehicle 100, transmission of vibration having a large influence on the passenger is suppressed. Is effective. One of the methods for determining the magnitude of the influence on the occupant is a method for determining by the magnitude of the power spectrum. This is because a vibration component having a large power is considered to dominate the vibration, and a vibration component having a small power is not dominant to the vibration. In addition, when the vibration for which transmission is to be suppressed is known (for example, the natural frequency of the system including the sprung of the vehicle 100 and the vehicle body support device 1), it is not necessary to determine the vibration for which transmission to the vehicle body 100B is to be suppressed. Also good. Here, the vibration power refers to the strength (power) of each frequency when the input vibration is decomposed into frequency components. The vibration power can be obtained by squaring and adding each of the coefficient of sin and the coefficient of cos when Fourier expansion is performed.

  In order to extract a spectrum having a large power from the vibration of every moment, that is, a vibration component that largely controls the vibration, it is preferable to perform vibration analysis in real time. Here, “real-time vibration analysis” does not mean simultaneity in a narrow sense, but a plurality of vibration data (amplitude, power, or energy data) from acquired vibrations in a predetermined time width. ) Is executed, a Fourier analysis is executed, and a series of operations for extracting a vibration component having a large power spectrum is repeated within a predetermined time.

  As shown in FIG. 5, the vibration signal from the vehicle body acceleration sensor 30 (see FIG. 1) is converted from an analog signal to a digital signal by an A / D (Analog / Digital) converter 50. The vibration signal converted into the digital signal is taken into the band pass filter 51, and only the vibration component belonging to a predetermined frequency band passes.

  In suppressing the vibration that the occupant feels uncomfortable to the vehicle 100 from being transmitted to the vehicle body 100B, the frequency band of the vibration in question, such as the frequency at which the occupant feels uncomfortable, the resonance frequency under the spring, and the unsprung mass, is set in advance. I know it. Using the band-pass filter 51 that passes this frequency band, preparations are made for specifying a frequency for which transmission to the vehicle body 100B is desired to be suppressed.

  The vibration in the frequency band that has passed through the bandpass filter 51 is temporarily stored in the data buffer 52. When the frequency setting unit 41 of the vibration control device 40 outputs a trigger signal indicating that the analysis of the preceding data has been completed to the data buffer 52, the vibration in the frequency band stored in the data buffer 52 is FFT (Fast Fourier Transform: Fast Fourier transform) sent to the analysis unit 53 for Fourier analysis. FIG. 7 shows an example of the result of Fourier analysis of the vibration of the vehicle body 100B shown in FIG.

The vibration in the specific frequency band converted from the time domain to the frequency domain by the FFT analysis unit 53 is stored in the storage unit 40M of the vibration suppression device 40. The frequency setting part 41 determines the frequency which suppresses transmission from the result of the Fourier analysis stored in the memory | storage part 40M, ie, a power spectrum. In the present embodiment, the frequency for suppressing transmission is a frequency at which the vibration power (or amplitude or energy) exceeds a predetermined threshold value as, and is f ₁ in the example shown in FIG.

  If the frequency setting part 41 specifies the frequency which suppresses transmission, the vibration suppression apparatus 40 will perform the process for suppressing the specific frequency transmitted to the vehicle body 100B so that it may mention later. When the execution of this process is finished, the frequency setting unit 41 sends a command to the FFT analysis unit 53 to acquire the next data from the data buffer 52 and execute the Fourier analysis. In the present embodiment, the structure support apparatus 1 and the like are controlled so as to detect the frequency of the vibration having a large influence on the occupant and to suppress the transmission of the vibration by repeatedly executing the above processing.

If the frequency which suppresses transmission is specified, the frequency setting part 41 will set the frequency which suppresses transmission, or the frequency of the integer multiple as the switching frequency fo of the gas passage opening / closing means 8. FIG. 8 shows an example of the valve opening command pulse. As shown in FIG. 8, the period of the valve opening command pulse is ta, and when opening and closing at a frequency that suppresses the specified transmission, fo = f ₁ = (1 / ta). Further, the communication time setting unit 42 sets the valve opening command pulse width tb based on the support load of the vehicle body support device 1 (see FIG. 8). The width tb of the valve opening command pulse is the valve opening time of the on-off valve 8V, and indicates the communication time of the gas passage 7 (hereinafter referred to as valve opening time). The valve opening time tb is preferably changed according to the magnitude of vibration power that vibrates at a frequency at which transmission is suppressed. For example, the valve opening time tb is increased as the power of vibration that vibrates at a frequency that suppresses transmission increases. As a result, the gain at the frequency at which transmission is suppressed can be made close to 0, so transmission of the notch frequency can be suppressed more reliably. Further, for example, the valve opening time tb may be decreased as the support load of the vehicle body support device 1 increases.

The valve control unit 43 opens the actuator 8A of the gas passage opening / closing means 8 with the opening / closing frequency fo set by the frequency setting unit 41 and the valve opening time tb set by the communication time setting unit 42 as the valve opening command pulse width. The valve command pulse is output. As a result, as shown in FIG. 9, the vehicle body support device 1 functions as a frequency filter having a gain of 0 at a frequency f ₁ for suppressing transmission and a gain of approximately 1.0 at other frequencies. That is, the vibration of the frequency f ₁ that suppresses transmission is blocked by the vehicle body support device 1 and hardly transmitted to the vehicle body 100B. Thus, it is possible to suppress the vibration of a frequency f ₁ to be transmitted to the vehicle body 100B. If the frequency f ₁ for suppressing transmission is set to the resonance frequency of the vehicle body 100B supported by the vehicle body support device 1, resonance amplification can be avoided.

10-13 is a figure for demonstrating the other example of control in the vehicle body support apparatus which concerns on this embodiment. In the following description, in the control of the vehicle body support device 1 according to the embodiment, for example, among the vibration components of the vehicle body 100B, an example of suppressing a plurality (2 in this example) of vibration components with dominant frequencies will be described. In this case, the frequency setting unit 41 sets a frequency of vibration that interrupts transmission to the vehicle body 100B (frequency at which transmission is suppressed). The frequency setting unit 41 uses the storage unit 40M in which the result of Fourier analysis of the vibration component of the vehicle body 100B is stored. FIG. 10 shows the result of Fourier analysis. In the present embodiment, the frequencies for suppressing transmission are frequencies at which the vibration power (or amplitude or energy) exceeds a predetermined threshold value as, and are f ₁ and f ₂ in the example shown in FIG.

If the frequency which suppresses transmission is specified, the frequency setting part 41 will set the valve opening command pulse of the gas passage opening / closing means 8. FIG. 11 shows an example of the valve opening command pulse, where the upper stage is a valve opening command pulse for the frequency f ₁ for suppressing transmission, and the lower stage is the valve opening command pulse for the frequency f ₂ for suppressing transmission. As shown in FIG. 11, the cycle of the valve opening command pulse for the frequency f ₁ for suppressing transmission is t ₁ , and f ₁ = (1 / t ₁ ). The period of the valve opening command pulse for the frequency f ₂ for suppressing transmission is t ₂ , and f ₂ = (1 / t ₂ ).

When there are a plurality of frequencies for suppressing transmission and when dealing with a plurality of vibration components of the frequencies, as shown in FIG. 12, the frequency setting unit 41 includes a valve opening command pulse for the notch frequency f ₁ and a frequency f ₁ . A valve opening command pulse train is formed by superimposing the valve opening command pulses. Here, the solid line in FIG. 12 is a valve opening command pulse for the frequency f ₁ for suppressing transmission, and the alternate long and short dash line is a valve opening command pulse for the frequency f ₂ for suppressing transmission.

The valve control unit 43 uses the opening / closing command pulse train set by the frequency setting unit 41 and the valve opening time tb (see FIG. 8) set by the communication time setting unit 42 as the valve opening command pulse width. A valve opening command pulse is output to the actuator 8A. As a result, as shown in FIG. 13, the vehicle body support device 1 is a frequency filter in which the frequency at which transmission is suppressed, that is, the gain at the notch frequencies f ₁ and f ₂ is 0 and the gain at other frequencies is 1.0. Function. That is, the vibrations of the notch frequencies f ₁ and f ₂ are blocked by the vehicle body support device 1 and hardly transmitted to the vehicle body 100B. As a result, vibrations of the notch frequencies f ₁ and f ₂ transmitted to the vehicle body 100B can be suppressed.

  If one of the plurality of notch frequencies is set to the resonance frequency of the vibration system of the vehicle 100, resonance amplification can be avoided. Further, in the shock absorber constituted by the spring and the hydraulic damper, there is a problem that the vibration isolation characteristics in a high frequency region deteriorate, but in the vehicle body support device 1 according to the present embodiment, a plurality of notch frequencies are set. Thus, it is possible to block a plurality of vibrations. Thus, vibration transmitted to the vehicle body 100B can be suppressed in a wide frequency band.

  In the above description, the example in which the vehicle body support device 1 or the like suppresses the vibration on the spring of the vehicle 100 has been described. However, the vehicle body support device 1 or the like according to the present embodiment can prevent the vibration of the vehicle 100 under the spring. The same applies. In this case, instead of detecting the vibration of the vehicle body 100 </ b> B (that is, vibration on the spring of the vehicle 100) by the vehicle body acceleration sensor 30, vibration under the spring of the vehicle 100 is detected by the acceleration sensor 31 for the suspension device. The gas passage opening / closing means 8 is opened and closed at a notch frequency determined based on the detected unsprung vibration. As a result, the unsprung vibration that vibrates at a frequency that affects the riding comfort can be suppressed from being transmitted to the vehicle body 100B, so that the riding comfort of the vehicle 100 can be improved. Further, by setting the unsprung frequency that deteriorates the followability of the wheel 24 to the road surface GL as a notch frequency, it is possible to suppress the deterioration of the followability of the wheel 24 to the road surface GL.

  In the above-described example, the vibration frequency for suppressing the transmission is determined based on the vibration on the spring of the vehicle 100 detected by the vibration detection unit or the unsprung state. However, the frequency of the vibration for suppressing the transmission is determined. It may be a constant value. For example, the natural frequency of the vibration system of the vehicle 100 may be selected as the vibration frequency for suppressing transmission, and the gas passage opening / closing means 8 may be opened and closed at a frequency corresponding to the natural frequency. This facilitates the control of the gas passage opening / closing means 8. In this case, the natural frequency also changes due to a change in the vehicle occupant and the loading capacity. However, the vibration detection unit detects the change in the natural frequency and suppresses the transmission according to the result. The frequency may be changed.

  Although the example which applied the vehicle body support apparatus 1 which concerns on this embodiment to the suspension apparatus of a vehicle was demonstrated, the application object of the vehicle body support apparatus 1 which concerns on this embodiment is not restricted to this, Transmission of the vibration of a notch frequency It can be applied to all vehicles that need to be suppressed. For example, suspension devices for general vehicles including bicycles, two-wheeled vehicles, trucks, buses, etc., railway vehicles such as trains and locomotives, or yaw dampers used for railway vehicles, shock absorbers used for two-wheeled vehicle steering dampers and aircraft legs In addition, the vehicle body support device 1 according to the present embodiment can be applied.

  As described above, the present embodiment includes an air chamber filled with a gas such as air or nitrogen, and input means for inputting vibration to the air chamber by reciprocating relative to the air chamber. The gas passage connected to the air chamber is opened and closed at a frequency that suppresses transmission, which is set according to the frequency when the means reciprocates relative to the air chamber. With such a configuration, the vibration of the frequency that suppresses the transmission is blocked by the vehicle body support device, and is hardly transmitted to the structure supported by the vehicle body support device. As a result, when the natural frequency of the vibration system constituted by the vehicle body support device and the supported mass supported by the vehicle body changes, the gas passage connected to the air chamber is opened and closed according to the change in the vibration characteristics. By changing the frequency, it is possible to exhibit a vibration suppressing effect on the supported mass while supporting a static load. Moreover, if the frequency which suppresses transmission is set based on the vibration under the spring of a vehicle, the followable | trackability deterioration of the wheel 24 with respect to the road surface GL can be suppressed, for example.

(Embodiment 2)
In the second embodiment, the load is supported by the first air chamber and the second air chamber provided in the vehicle body support device, and the first air chamber and the second air chamber communicate with each other in the pair of vehicle body support devices. A gas passage opening and closing means for opening and closing at a predetermined frequency is provided in a third gas passage connecting the first gas passage and the second gas passage. There is a feature. In the following description, the vehicle body support device 1c (see FIG. 2-3) described in the first embodiment will be described as an example. In the present embodiment, the other vehicle body support device described in the first embodiment is applied. Also good. In the following, the left and right of the vehicle are the left and right based on the traveling direction of the vehicle, and the front and rear of the vehicle refer to the front and rear based on the traveling direction of the vehicle.

FIG. 14 is an explanatory diagram showing a piping pattern of the vehicle body support system according to the present embodiment. FIG. 15 is an explanatory diagram illustrating an example in which air chambers are connected between vehicle body support devices attached to the left and right of the vehicle in the vehicle body support system according to the present embodiment. The arrow L direction in FIG. 15 represents the traveling direction of the vehicle 100. Further, in FIG. 15, but the body supporting apparatus 1c ₁ to 1 ₄ are arranged at the position of the plan view, for clarity of the pipe, the body support device is to be vertically positioned, parallel to the paper surface It is described.

The vehicle body support system 10 shown in FIG. 14 shows the configuration of the front portion of the vehicle 100 shown in FIG. A vehicle body support device 1c provided with the vehicle body support system 10 shown in FIG. 15 has the same configuration as the vehicle body support device 1c of the vehicle body support system 10 shown in FIG. The vehicle body support system 10 according to the present embodiment includes a first vehicle body support device 1c ₁ and a second vehicle body support device 1c ₂ as a pair of vehicle body support devices. ). The first vehicle body support device 1c ₁ is attached to the right side in the traveling direction of the vehicle 100 (the direction of arrow L in FIG. 14), and the second vehicle body support device 1c ₂ is attached to the left side in the traveling direction of the vehicle 100. Thus, the pair of first vehicle body support device 1c ₁ and second vehicle body support device 1c ₂ are attached to different positions (left and right in this example) of vehicle 100 to absorb the input received by wheels 24 from the road surface. ,ease. In the suspension device provided in the vehicle 100, the arms that guide the movement of the wheel 24 in the vertical direction are fixed to the first and second vibration input means 3A ₁ and 3A ₂ as upper arms 21U ₁ and 21U ₂ , respectively. Connected.

The first air chamber 4A _{1 of} the first vehicle body support device 1c ₁ and the second air chamber 4B _{2 of} the second vehicle body support device 1c ₂ are connected by a _first gas passage 71. Further, the second air chamber 4B _{1 of} the first vehicle body support device 1c ₁ and the first air chamber 4A _{2 of} the second vehicle body support device 1c ₂ are connected by a _second gas passage 72. Thus, the first gas passage ₇₁ and second fluid path 7 _2, each of the first air chamber and each of the second air chamber different body supporting apparatus has communicates.

The first gas passage 7 ₁ and the second gas passage 7 ₂ are connected by a third gas passage 9. The third gas passage 9 is provided with gas passage opening / closing means 8. The gas passage opening / closing means 8 is opened / closed by the vibration control device 40 at a predetermined frequency (for example, vibration that an occupant feels uncomfortable) to suppress transmission of vibration of the predetermined frequency to the vehicle body 100B. it can. That is, only for the predetermined frequency, the spring stiffness of the first vehicle body support device 1c ₁ and the second vehicle body support device 1c ₂ is reduced semi-actively by using the gas passage opening / closing means 8 to thereby vibrate at the predetermined frequency. Is transmitted to the vehicle body 100B. Thus, in the vehicle body support system 10, the vehicle body 100B is supported even when the natural frequency of the vibration system formed by the mass of the vehicle body support device 1c and the vehicle body 100B supported by the vehicle body 100B changes while supporting the load of the vehicle body 100B. The vibration suppression effect can be demonstrated.

When suppressing vibration transmission at a predetermined frequency, the gas passage opening / closing means 8 may be opened and closed according to the vibration input side for which transmission is to be suppressed. For example, vibration data sent from four vibration detection means, ie, a first vehicle body acceleration sensor 30 ₁ , a second vehicle body acceleration sensor 30 ₂ , a first suspension device acceleration sensor 31 ₁ , and a second suspension device acceleration sensor 31 _2. Are each frequency-resolved. When a vibration having the maximum vibration power is specified, the vibration of the component is prevented from being transmitted to the vehicle body 100B by opening and closing the gas passage opening / closing means 8 at the specified vibration frequency. can do. The timing for opening and closing the first gas passage opening and closing means ₈₁ and the second gas passage opening and closing means ₈₂ may be at the same timing, or at different timings.

Opening the gas passage opening and closing means 8, ₁ and the first gas passage 7, ₂ and the second gas passage 7 communicates, it is integrated as a closed gas. Here, the first fluid path 7 ₁ includes a first air chamber 4A ₁ of the first body supporting apparatus 1c _1, connects the second air chamber 4B ₂ of the second body supporting apparatus 1c _2, also, the gas passage 7 ₂ 2 is connected to the second air chamber 4B ₁ of the first body supporting apparatus 1c _1, the first and air chambers 4A ₂ of the second body supporting apparatus 1c _2. When the gas passage opening / closing means 8 is opened and closed at the specified vibration frequency, the vibration having that frequency is received by the gas in all the four air chambers. Therefore, the first vehicle body support device 1c _{1 with} respect to minute high-frequency vibrations, The spring rigidity of the second vehicle body support device 1c ₂ is reduced.

Next, the operation for quasi-static displacement will be described. When the first vehicle body support device 1c ₁ and the second vehicle body support device 1c ₂ operate in opposite phases, the first vehicle body support device 1c ₁ and second vehicle body support device 1c ₂ operate in the same phase. The spring constant increases (in this example, approximately twice). Here, when operating in the opposite phase, for example, the first vibration input means 3A _{1 of} the first vehicle body support device 1c ₁ moves to the ascending side (the attachment side to the vehicle body 100B, the arrow U side), and the second second vibration input means 3A ₂ is the descending side of the body supporting apparatus 1c ₂ (opposite to the mounting side of the vehicle 100, the arrow D side) is a case of moving to. Also, the case of operating in the same phase, for example, first vibration input unit 3A ₁ of the first body supporting apparatus 1c _1, and the second vibration input means 3A ₂ is the second body supporting apparatus 1c _2, both raised side Or it is a case where it moves to the descent side.

For example, the first vibration input unit 3A ₁ of the first body supporting apparatus 1c _1, when the first body supporting apparatus 1c ₁ is lowered, the first air chamber 4A ₁ of the first body supporting apparatus 1c ₁ volume reduction The volume of the second air chamber 4B ₁ increases. The first air chamber 4A ₁ of the first body supporting apparatus 1c _1, since through the second communication with the air chamber 4B ₂ of the second body supporting apparatus 1c _2, the first body supporting apparatus 1c ₁ first air chamber 4A _The gas pushed out by the volume reduction of ₁ tries to move to the second air chamber 4B _{2 of} the second vehicle body support device 1c ₂ . The second air chamber 4B ₁ of the first body supporting apparatus 1c _1, since through the first communication with the air chamber 4A ₂ of the second body supporting apparatus 1c _2, first second air-body supporting apparatus 1c ₁ As the volume of the chamber 4B ₁ increases, gas tends to flow from the first air chamber 4A _{2 of} the second vehicle body support device 1c ₂ .

If the first body supporting apparatus 1c ₁ and the second body supporting apparatus 1c ₂ operate in opposite phases, the first vibration input unit 3A ₁ of the first body supporting apparatus 1c ₁ is the first ascending side of the air chamber 4A ₁ When moved, the first vibration input means 3A ₂ of the second vehicle body support device 1c ₂ moves to the lower side of the first air chamber 4A ₁ . As a result, the volume of the second air chamber 4B ₂ of the second vehicle body support device 1c ₂ is reduced, so that gas is pushed out to the first air chamber 4A _{1 of} the first vehicle body support device 1c ₁ . Further, since the volume of the first air chamber 4A ₂ of the second vehicle body support device 1c ₂ increases, the gas flows out from the second air chamber 4B _{1 of} the first vehicle body support device 1c ₁ .

Thus, when the first body supporting apparatus 1c ₁ and the second body supporting apparatus 1c ₂ operate in opposite phases, the first air chamber 4A ₁ of the first body supporting apparatus 1c ₁ of the second body supporting apparatus 1c ₂ gas transfer between the second air chamber 4B _2, and first and body support device second air chamber 4B ₁ of 1c ₁ movement of gas between the first air chamber 4A ₂ of the second body supporting apparatus 1c ₂ inhibited The As a result, in the suspension device 100 according to the present embodiment, when the first vehicle body support device 1c ₁ and the second vehicle body support device 1c ₂ operate in opposite phases, the first vehicle body support device 1c ₁ and the second vehicle body support device 1c. The spring constant of ₂ increases.

On the other hand, when the first body supporting apparatus 1c ₁ and the second body supporting apparatus 1c ₂ operate in the same phase, the first air chamber 4A ₁ of the first body supporting apparatus 1c ₁ of the second body supporting apparatus 1c ₂ 2 gas transfer between the air chamber 4B _2, and first and body support device second air chamber 4B ₁ of 1c ₁ the movement of gas between the first air chamber 4A ₂ of the second body supporting apparatus 1c ₂ Promoted. As a result, in the suspension device 100 according to the present embodiment, when the first vehicle body support device 1c ₁ and the second vehicle body support device 1c ₂ operate in the same phase, the first vehicle body support device 1c ₁ and the second vehicle body support device 1c. The spring constant of ₂ is reduced and the ride comfort is improved.

Here, the case where the first vehicle body support device 1c ₁ and the second vehicle body support device 1c ₂ operate in the same phase corresponds to the case where the vehicle 100 travels straight. On the other hand, the case where the first vehicle body support device 1c ₁ and the second vehicle body support device 1c ₂ operate in opposite phases corresponds to the case where the vehicle 100 turns. In the suspension device 100 according to the present embodiment, the spring constant increases when the first vehicle body support device 1c ₁ and the second vehicle body support device 1c ₂ operate in opposite phases. As a result, while the ride comfort is ensured with a low spring constant when the vehicle 100 is traveling straight, the roll rigidity is improved with a high spring constant when the vehicle 100 is turning. Performance can be improved. Thus, the vehicle body support system 10 can easily change the spring constant of the shock absorber according to the traveling state of the vehicle 100 to achieve both riding comfort and steering stability during turning. At the same time, the vehicle body support system 10 can suppress the transmission of the vibration by opening and closing the gas passage opening / closing means 8 at a vibration frequency that is not desired to be transmitted to the vehicle body 100B, thereby suppressing deterioration in riding comfort.

  Further, for example, by opening and closing the gas passage opening / closing means 8 with vibration that the passenger feels uncomfortable, the vibration that the passenger feels uncomfortable is suppressed from being transmitted to the vehicle body 100B, thereby providing a comfortable riding comfort. it can. This can be realized even while the vehicle 100 is turning. Furthermore, if the gas passage opening / closing means 8 is opened and closed at the same frequency as the vibration frequency in the roll direction of the vehicle 100, transmission of vibration in the roll direction of the vehicle 100 can be suppressed and stable turning of the vehicle 100 can be realized.

  The vehicle body support system 10 according to the present embodiment communicates the first air chambers and the second air chambers of a pair of different vehicle body support devices, and mechanical vehicle body rolls when the vehicle 100 is turning. It functions in the same way as the stabilizer for. As a result, even if a stabilizer for a mechanical body roll is not provided, the same effect as that provided with a stabilizer can be obtained. As a result, a mechanical stabilizer becomes unnecessary, which contributes to weight reduction.

Also, in the case of mechanical stabilizers, if a high torsional rigidity is used to improve the roll rigidity, the ride comfort will deteriorate when one wheel passes through the step, and the steering stability will be affected. Or However, the suspension device 100 according to the present embodiment can suppress deterioration in ride comfort because the spring constant is low when the first vehicle body support device 1c ₁ and the second vehicle body support device 1c ₂ operate in the same phase. In addition, the influence on the steering stability can be reduced.

Further, in the vehicle body support system 10 shown in FIG. 14, the vehicle height of the vehicle 100 can be adjusted by supplying gas from the gas supply sources 60A and 60B to the first and second vehicle body support devices 1c ₁ and 1c ₂ . it can. A switching valve 61 ₁ is disposed between the gas supply source 60A and the first system S1, and a switching valve 61 ₂ is disposed between the gas supply source 60B and the second system S2. The switching valves 61 ₁ and 61 ₂ are configured to include shut-off devices 62 ₁ and 62 ₂ , check valves 63 ₁ and 63 ₂ , and exhaust parts 64 ₁ and 64 ₂ .

If gas is separately supplied to the first system S1 or the second system S2, the left and right or front and rear vehicle heights can be made different. Thus, the vehicle height can be adjusted for each vehicle body support device by supplying and exhausting air to the first system S1 or the second system S2. For this reason, for example, when a load is applied to the vehicle body support device, so-called auto leveling control is also possible in which control is performed so as to maintain a preset vehicle height using the stroke sensors 32 ₁ , 32 _{2 and the} like.

FIG. 16 is an explanatory diagram showing an example in which the air chambers are connected between the vehicle body support devices attached to the front and rear of the vehicle in the vehicle body support system according to the present embodiment. The arrow L direction in FIG. 16 represents the traveling direction of the vehicle 100. In the vehicle body support system 10a, the air chambers included in each vehicle body support device are communicated with each other between a pair of vehicle body support devices on the same side and front and rear of the vehicle. Specifically, as shown in FIG. 16, between a first vehicle body support device 1c ₁ and a third vehicle body support device 1c ₃ which are a pair of vehicle body support devices attached to the same side of the vehicle 100 and in the front and rear, and Similarly, the air chambers of the respective vehicle body support devices communicate with each other between the second vehicle body support device 1c ₂ and the fourth vehicle body support device 1c ₄ which are a pair of vehicle body support devices.

In this example, as shown in FIG. 16, a first air chamber 4A ₁ of the first body supporting apparatus 1c ₁ and the second air chamber 4B ₃ of the third body supporting apparatus 1c ₃ in the first fluid path 7 ₁ The second air chamber 4B _{1 of} the first vehicle body support device 1c ₁ and the first air chamber 4A _{3 of} the third vehicle body support device 1c ₃ are connected by the _second gas passage 72. Further, the first air chamber 4A _{2 of} the second vehicle body support device 1c ₂ and the second air chamber 4B _{4 of} the fourth vehicle body support device 1c ₄ are connected by the _first gas passage 71, and the second vehicle body support device 1c. _{The second} second air chamber 4B ₂ and the first air chamber 4A _{4 of} the fourth vehicle body support device 1c ₄ are connected by the _second gas passage 72.

In the vehicle body support system 10a, a first body supporting apparatus 1c ₁ and the third body supporting apparatus 1c _2, it is connected by a first fluid path 7 ₁ and the second fluid path 7 _2. The first gas passage 7 ₁ and the second gas passage 7 ₂ are connected by a third gas passage 9 provided with a first gas passage opening / closing means 8 ₁ . Further, a second body supporting apparatus 1c ₂ and the fourth body supporting apparatus 1c _4, it is connected by a first fluid path 7 ₁ and the second fluid path 7 _2. The first gas passage 7 ₁ and the second gas passage 7 ₂ are connected by a third gas passage 9 provided with a second gas passage opening / closing means 8 ₂ . Then, the first gas passage opening / closing means 8 ₁ and the second gas passage opening / closing means 8 ₂ are opened and closed by the vibration control device 40 at a predetermined frequency (for example, vibration that an occupant feels uncomfortable), respectively. Can be prevented from being transmitted to the vehicle 100.

The first gas passage opening / closing means 8 ₁ and the second gas passage opening / closing means 8 ₂ are the first and second vehicle body acceleration sensors 30 ₁ and 30 ₂ and the first and second suspension device acceleration sensors 31 ₁ and 31 _2. It is controlled based on the signal from For this reason, even when the natural frequency of the vibration system formed by the mass of the vehicle body support device 1c and the vehicle body 100B supported by the vehicle body support device 1c changes, the change corresponding thereto is changed to the first and second vehicle body acceleration sensors 30 ₁ , 30. and it controls the first gas passage opening and closing means ₈₁ or the like is obtained from ₂ or the like, can exhibit vibration suppressing effect with respect to the vehicle body 100B.

FIG. 17 shows an example in which the air chambers are connected between a pair of vehicle body support devices at diagonal positions among the vehicle body support devices attached to the front, rear, left, and right of the vehicle in the vehicle body support system according to the present embodiment. It is explanatory drawing. An arrow L direction in FIG. 17 represents a traveling direction of the vehicle 100. Specifically, as shown in FIG. 17, the vehicle body support system 10 b includes a pair of first vehicle body support devices 1 c ₁ and a pair of first vehicle body support devices 1 c ₁ that are diagonally positioned among the vehicle body support devices 1 c attached to four locations of the vehicle 100. 4 between the vehicle body supporting apparatus 1c _4, and between the second body supporting apparatus 1c ₂ of the pair and the third body supporting apparatus 1c _3, communicates the air chamber of the respective body supporting device.

In this example, as shown in FIG. 17, a first air chamber 4A ₁ of the first body supporting apparatus 1c ₁ and the second air chamber 4B ₄ of the fourth body supporting apparatus 1c ₄ in the first fluid path 7 ₁ The second air chamber 4B _{1 of} the first vehicle body support device 1c ₁ and the first air chamber 4A _{4 of} the fourth vehicle body support device 1c ₃ are connected by the _second gas passage 72. Further, the first air chamber 4A ₂ of the second body supporting apparatus 1c _2, and a second air chamber 4B ₃ of the third body supporting apparatus 1c ₃ are connected by the third gas passage 7 _3, the second body supporting apparatus 1c _{The second} second air chamber 4B ₂ and the first air chamber 4A _{3 of} the third vehicle body support device 1c ₃ are connected by a fourth gas passage 7 ₄ .

In this body supporting system 10b, first gas passage 7 ₁ and the second fluid path 7 _2, the first gas passage opening and closing means ₈₁ is connected with the third gas passage 9 is provided. The third gas passage 7 ₃ and the fourth gas passage 7 ₄ are connected by a third gas passage 9 provided with _second gas passage opening / closing means 8 ₂ . Then, the first and second gas passage opening / closing means 8 ₁ and 8 ₂ are opened and closed by the vibration control device 40 at a predetermined frequency (for example, vibration that an occupant feels uncomfortable), respectively, thereby vibrating at the predetermined frequency. Can be prevented from being transmitted to the vehicle.

The first gas passage opening / closing means 8 ₁ and the second gas passage opening / closing means 8 ₂ are the first and second vehicle body acceleration sensors 30 ₁ and 30 ₂ and the first and second suspension device acceleration sensors 31 ₁ and 31 _2. It is controlled based on the signal from For this reason, even when the natural frequency of the vibration system formed by the mass of the vehicle body support device 1c and the vehicle body 100B supported by the vehicle body support device 1c changes, the change corresponding thereto is changed to the first and second vehicle body acceleration sensors 30 ₁ , 30. and it controls the first gas passage opening and closing means ₈₁ or the like is obtained from ₂ or the like, can exhibit vibration suppressing effect with respect to the vehicle body 100B.

  As described above, in this embodiment, the frequency for opening and closing the gas passage opening and closing means is controlled based on the actual vibration of the vehicle. Thus, even when the natural frequency of the vibration system formed by the mass of the vehicle body support device and the vehicle body supported by the vehicle body change device, the frequency for opening and closing the gas passage opening / closing means can be controlled by reflecting the corresponding change. Therefore, the vibration suppression effect with respect to a vehicle body can be exhibited.

  In the present embodiment, the first gas chamber and the second air chamber stably support the load, and in the pair of shock absorbers, the first gas communicates the first air chamber and the second air chamber with each other. A passage and a second gas passage are provided. As a result, the spring constant when the pair of shock absorbers operates in the opposite phase is larger than the spring constant when operated in the same phase. By arranging such a pair of shock absorbers on the left and right or front and rear of the vehicle, the spring constant of the shock absorber can be easily changed according to the traveling state of the vehicle.

  As described above, the vehicle body support system according to the present invention is useful for supporting the vehicle body, and is particularly suitable for suppressing the transmission of vibrations that are not desired to be transmitted to the vehicle body to be supported. .

It is explanatory drawing which shows the structure of the vehicle body support apparatus which concerns on this embodiment. It is explanatory drawing which shows the other example of a gas channel | path opening / closing means. It is explanatory drawing which shows the other structural example of the vehicle body support apparatus which concerns on this embodiment. It is explanatory drawing which shows the other structural example of the vehicle body support apparatus which concerns on this embodiment. It is explanatory drawing which shows the other structural example of the vehicle body support apparatus which concerns on this embodiment. It is explanatory drawing which shows the other structural example of the vehicle body support apparatus which concerns on this embodiment. It is explanatory drawing which shows the structure of the vehicle body support apparatus applicable to the suspension apparatus which concerns on this embodiment. It is explanatory drawing which shows the structure of the vehicle body support apparatus applicable to the suspension apparatus which concerns on this embodiment. It is a conceptual diagram which shows the state which has arrange | positioned the vehicle body support apparatus which concerns on this embodiment to the vehicle. It is explanatory drawing which shows the structure of the vibration control apparatus which concerns on this embodiment. It is a functional block diagram at the time of performing the Fourier analysis used for this embodiment. It is a figure for demonstrating the example of control of the vehicle body support apparatus which concerns on this embodiment. It is a figure for demonstrating the example of control of the vehicle body support apparatus which concerns on this embodiment. It is a figure for demonstrating the example of control of the vehicle body support apparatus which concerns on this embodiment. It is a figure for demonstrating the example of control of the vehicle body support apparatus which concerns on this embodiment. It is a figure for demonstrating the other example of control in the vehicle body support apparatus which concerns on this embodiment. It is a figure for demonstrating the other example of control in the vehicle body support apparatus which concerns on this embodiment. It is a figure for demonstrating the other example of control in the vehicle body support apparatus which concerns on this embodiment. It is a figure for demonstrating the other example of control in the vehicle body support apparatus which concerns on this embodiment. It is explanatory drawing which shows the pattern of piping of the vehicle body support system which concerns on this embodiment. It is explanatory drawing which shows the example which connected the air chamber between the vehicle body support apparatuses attached to the right and left of the vehicle in the vehicle body support system which concerns on this embodiment. In the vehicle body support system according to the present embodiment, it is an explanatory view showing an example in which air chambers between vehicle body support devices attached to the front and rear of a vehicle are connected. FIG. 4 is an explanatory diagram showing an example in which air chambers are connected between a pair of vehicle body support devices at diagonal positions among the vehicle body support devices attached to the front, rear, left, and right of the vehicle in the vehicle body support system according to the present embodiment. .

Explanation of symbols

1, 1a, 1b, 1c, 1d Car body support device 2 Cylinder 3 Piston 3A, 3B Load transmitting member 4 Air chamber 4A First air chamber 4B Second air chamber 5 Piston rod 7 Gas passage 8 Gas passage opening / closing means 8A Actuator 8V Opening / closing Valve 9 Third gas passage 10, 10a, 10b Car body support system 20 Suspension device 21L Lower arm 21U Upper arm 24 Wheel 30 Car body acceleration sensor 31 Acceleration sensor for suspension device 32 Stroke sensor 40 Vibration control device 40M Storage unit 40P CPU
41 Frequency setting unit 42 Communication time setting unit 43 Valve control unit 44 Input port 45 Output port 100 Vehicle 100B Vehicle body

Claims (8)

It is provided between the vehicle body and the wheel of the vehicle, and supports the vehicle body,
A first air chamber and a second air chamber filled with gas, and disposed between the first air chamber and the second air chamber, relative to the first air chamber and the second air chamber. And a vibration input means for inputting at least one of the vibration from the vehicle body or the vibration from the wheel to the first air chamber and the second air chamber by reciprocally moving back and forth. A support device;
In the pair of vehicle body support devices, a first gas passage connecting a first air chamber included in one of the vehicle body support devices and a second air chamber included in the other vehicle body support device;
A second gas passage connecting a second air chamber provided in one of the vehicle body support devices and a first air chamber provided in the other vehicle body support device;
The input means is attached to a third gas passage that connects the first gas passage and the second gas passage to each other, and the input means is relative to the first air chamber and the second air chamber. Gas passage opening and closing means for opening and closing the third gas passage at a predetermined frequency according to the frequency at the time of reciprocal movement,
A vehicle body support system comprising:   The vehicle body support system according to claim 1, wherein the pair of shock absorbers are a pair of shock absorbers attached to left and right sides of the vehicle.   The vehicle body support system according to claim 1, wherein the pair of shock absorbers are a pair of shock absorbers attached on the same side of the vehicle and front and rear.   The vehicle body support system according to claim 1, wherein the pair of shock absorbers are a pair of shock absorbers attached to diagonal positions of the vehicle. A vibration detection means for detecting vibration of at least one of the sprung or unsprung parts of the vehicle is attached to the vehicle,
A vibration component detected by the vibration detection means and having a power equal to or higher than a predetermined vibration power is selected as a vibration frequency of the transmission suppression target, and the selected frequency of the vibration of the transmission suppression target is multiplied by an integer or an integer. The vehicle body support system according to any one of claims 1 to 4, wherein the third gas passage is opened and closed at a frequency.   The vibration component detected by the vibration detection means and having a predetermined power or more is selected as the vibration frequency to be transmitted and the gas passage opening / closing means is opened / closed according to the magnitude of the vibration power. 6. The vehicle body support system according to claim 5, wherein a ratio of the opening time to the closing time is changed.   Select a vibration component with a predetermined power or higher as the vibration frequency to be transmitted, select a plurality of frequencies in descending order of vibration power, and select a frequency that is an integer multiple or a fraction of an integer. The vehicle body support system according to claim 5, wherein the gas passage opening and closing means is opened and closed.   Open time when opening and closing the gas passage opening / closing means for each frequency according to the magnitude of the power of the selected frequency according to the magnitude of the power of the selected frequency according to the magnitude of the power of the selected frequency among a plurality of set frequencies The vehicle body support system according to claim 7, wherein a ratio between the vehicle closing time and the closing time is changed.

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