JP2005075278A - Vehicular gas pressure servo cylinder, vehicle trembling preventive device including the vehicular gas pressure servo cylinder, and vehicle equipped with the vehicle trembling preventive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease a working gas flow rate in a vehicular gas pressure servo cylinder generating force against trembling in a lateral direction of a vehicle body. <P>SOLUTION: In the vehicular gas pressure servo cylinder 230, a first partition piston 47 and a second partition piston 50 are provided on the outside of a piston ring 144 of a cylinder main body portion 240. Gas pressure according to a degree of trembling in the lateral direction is supplied into each inside pressure chamber in front/at the rear of the piston ring 144. When the piston ring 144 excessively moves, the partition pistons 48, 50 move to each outside pressure chamber outside of the piton ring 144 with the piston ring 144. In order to return the excessively moving piston ring 144 to a neutral position, the bias gas pressure in each inside pressure chamber is changed by using position sensors 178, 180. The vehicle trembling preventive device can be structured by using the vehicular gas pressure servo cylinder, and mounted on a vehicle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a gas pressure servo cylinder for a vehicle, a vehicle anti-sway device including the same, and a vehicle including the vehicle anti-sway device, and in particular, a vehicle gas pressure servo cylinder that generates a force against lateral shaking of a vehicle body, The present invention relates to a vehicle shake prevention device including the vehicle and a vehicle including the vehicle shake prevention device.

  2. Description of the Related Art In recent urban vehicles or rail vehicles as high-speed mass transportation means, a wide range of structures for supporting a vehicle body on a carriage by air springs or coil springs in order to reduce the weight of the vehicle body and ensure good riding comfort with little vibration. It is used. In such a vehicle body support device, the weight of the vehicle body is always applied to the air spring or coil spring that supports the vehicle body, so that it is possible to always exert the optimal rigid support force in the vertical direction. It is possible to sufficiently respond to the speed increase request.

  On the other hand, when the vehicle passes through a curve, lateral displacement or lateral swaying occurs in the vehicle body, and this tendency becomes particularly prominent when the vehicle composition is long. The air spring or the coil spring lacks the lateral rigidity against the lateral displacement or the lateral fluctuation. Thus, for example, Patent Document 1 discloses that an air cylinder is disposed in a lateral direction between a carriage and a vehicle body to generate a constant pressure lateral rigidity with respect to the vehicle body lateral displacement. In Patent Document 2, it is disclosed that a pneumatic servo cylinder is disposed between a pendulum beam supporting a vehicle body and a carriage frame so that the vehicle body does not tilt too much in the lateral direction due to centrifugal force due to a curve in the pendulum vehicle. ing. Here, by controlling the pneumatic cylinder according to the curve information received from the track while the vehicle is running and changing the distance between the bogie frame and the pendulum beam, the vehicle body is properly laterally centered around the pendulum beam center. A technique for inclining in the direction and reducing the influence of centrifugal force when passing a curve has been proposed.

JP 2000-225942 A Japanese Patent Laid-Open No. 10-129478

  If a gas pressure servo cylinder as shown in the prior art is used to suppress the lateral shaking of the vehicle body, a force that resists lateral shaking from the gas pressure servo cylinder is generated according to the lateral acceleration received by the vehicle body. It can be generated. However, since the lateral vibration suppression force is controlled by the lateral acceleration feedback, the displacement cannot be monitored by the acceleration sensor even if the piston moves greatly when the vehicle body is largely displaced due to a large impact or the like. Therefore, the piston may move excessively as it is and collide with the inner wall of the cylinder to cause damage or the like. In order to prevent this, a stopper can be provided, but this time there arises a problem of breakage of the stopper itself and a problem that the structure becomes complicated. Therefore, it is conceivable that the length of the gas chamber in the cylinder is extended and the stroke of the piston is set to a stroke for lateral shaking + a margin stroke for a large impact or the like. However, in this case, the volume of the gas chamber in the cylinder increases, the working gas flow rate increases, and the capacity of the compressor, for example, increases.

  In addition, if the piston moves greatly, the vehicle body remains laterally displaced or tilted, so it is necessary to provide a special means for pulling the vehicle body back to the neutral position. It becomes composition.

  An object of the present invention is to solve the problems of the prior art and to reduce the working gas flow rate in a vehicular servo cylinder that generates a force that resists lateral shaking of the vehicle body. Another object of the present invention is to eliminate the need for a separate means for returning the vehicle body to its original neutral position in a vehicle servo cylinder that generates a force that resists lateral shaking of the vehicle body. A further object of the present invention is to provide a vehicle shake prevention device using such a vehicular servo cylinder and an acceleration sensor. Still another object of the present invention is to provide a vehicle using such a vehicle anti-sway device.

  In order to achieve the above object, a vehicular gas pressure servo cylinder according to the present invention is provided between a bogie and a vehicle body on which the vehicle body is placed on a bogie via an air spring or a coil spring. Connected to the piston rod and the cylinder housing fixed to either the bogie or the car body, the piston rod fixed to the car or the car body, and the piston rod A piston having a piston ring slidable inside the cylinder housing, and pressure chambers formed before and after the piston ring by cooperation of the piston and the cylinder housing, each pressure chamber being separated by a partition piston Including a pressure chamber partitioned into an inner pressure chamber on the piston ring side and an outer pressure chamber on the outer side thereof, and the piston is supplied in accordance with the magnitude of the shaking. The differential pressure, which is the difference in gas pressure to the inner pressure chamber, creates a force that resists shaking, and the partition piston receives the high gas pressure of the outer pressure chamber as the piston ring moves when the piston ring moves excessively. It is characterized by that.

  The vehicle gas pressure servo cylinder according to the present invention is provided between a carriage and a vehicle body in a vehicle in which the vehicle body is placed on the carriage via an air spring or a coil spring, and resists lateral shaking of the vehicle body. A gas pressure servo cylinder that generates force, a cylinder housing fixed to either the carriage or the vehicle body, a piston rod fixed to either the carriage or the vehicle body, and a cylinder housing connected to the piston rod A piston having a piston ring slidable inside the body, a pressure chamber formed before and after the piston ring by the cooperation of the piston and the cylinder housing, a position sensor for detecting the position of the piston ring, and each pressure A gas pressure control unit that controls a gas pressure supplied to the chamber, and the gas pressure control unit compares the neutral position of the piston ring with the detection position to Set the bias gas pressure to be supplied to each pressure chamber in the direction to return to the standing position, and control the gas pressure to be supplied to each pressure chamber by superposing the differential pressure according to the magnitude of the fluctuation on each bias gas pressure. It is characterized by doing.

  Further, in the vehicular gas pressure servo cylinder according to the present invention, each pressure chamber is partitioned by a partition piston into an inner pressure chamber on the piston ring side and an outer pressure chamber on the outer side thereof, and the partition piston has an excessive piston ring. When moving, it is preferable to move to the outer pressure chamber side as the piston ring moves.

  According to another aspect of the present invention, there is provided a vehicle anti-sway device according to any one of claims 1 to 3, wherein a vehicular gas pressure servo cylinder, an acceleration sensor that detects a shake of a vehicle body, and an output signal of the acceleration sensor are processed. And a control valve that opens and closes in response to the output signal of the acceleration sensor calculated by the controller and controls the gas pressure supplied to the vehicular gas pressure servo cylinder.

  A vehicle according to the present invention includes the vehicle shake prevention device according to claim 4.

  With the above configuration, in the gas pressure servo cylinder for a vehicle according to the present invention, the pressure chamber formed by the piston and the cylinder housing is conveniently provided with four pressure chambers. That is, there are originally two gas chambers formed before and after the piston ring, and the two gas chambers are respectively partitioned into an inner pressure chamber on the piston ring side and an outer pressure chamber on the outer side thereof by separate partition pistons. And the gas pressure according to the magnitude | size of fluctuation is supplied to the two inner pressure chambers on both sides of the piston ring. That is, each partition piston has a function of partitioning the pressure chamber formed by the piston and the cylinder housing and reducing the volume of the pressure chamber used for suppressing the shaking. The partition piston normally has only a partition function, but has a function of moving to the outer pressure chamber side as the piston ring moves when the piston ring moves excessively. That is, the partition piston also has a function of moving while reducing the volume of the outer pressure chamber by receiving excessive movement of the piston ring in the event of an impact or the like. In this way, the volume of the pressure chamber used for suppressing vibration can be reduced while allowing excessive movement of the piston ring in the event of an impact or the like. Can be reduced.

  With the above configuration, the gas pressure control unit in the vehicle gas pressure servo cylinder supplies the gas pressure to each pressure chamber by superimposing a differential pressure corresponding to the magnitude of the fluctuation on the bias gas pressure. Then, the position of the piston ring is detected by the position sensor, the neutral position of the piston ring is compared with the detected position, and the bias gas pressure supplied to each pressure chamber is set in the direction to return the piston ring to the neutral position. Therefore, when the piston ring moves excessively, the gas pressure is set so that the piston ring is pulled back. Therefore, it is not necessary to separately provide means for pulling the vehicle back to the neutral position in addition to the gas pressure servo cylinder.

  As already mentioned, if an acceleration sensor and a gas pressure servo cylinder are used to prevent the vehicle from shaking, the acceleration sensor cannot monitor the displacement when the vehicle body is greatly displaced due to a large impact, etc. It was a problem that it moved and the vehicle body could not be returned. As described above, these problems are solved by using the vehicular gas pressure servo cylinder according to the present invention. Therefore, a vehicle vibration preventing device according to the present invention uses the above-described vehicle gas pressure servo cylinder, includes an acceleration sensor that detects the shaking of the vehicle body, and uses a control valve that opens and closes according to the output signal of the acceleration sensor. Controls the gas supplied to the gas pressure servo cylinder. In this way, by detecting the shaking with the acceleration sensor and suppressing the vibration with the above-described vehicle gas pressure servo cylinder, the left and right shaking of the vehicle body can be greatly reduced. For example, in a vehicle provided with the vehicle anti-sway device according to the present invention, it is possible to suppress the left-right oscillation of the vehicle body to about ½ compared to the conventional example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the track vehicle to which the gas pressure servo cylinder for a vehicle is applied has a structure in which an air spring is provided between the carriage and the vehicle body, and a coil spring is provided between the carriage and the axle. However, a structure other than this, for example, a spring such as a leaf spring may be used, and the attachment position of the other spring may be used. Further, the vehicle may be a pendulum vehicle including a pendulum beam that supports the vehicle body and a carriage that supports the pendulum beam on a rail so that the pendulum beam can be tilted through the tilting means.

  FIG. 1 is a configuration diagram of a vehicle 10 to which a vehicular gas pressure servo cylinder 30 according to the present invention is applied. FIG. 1 shows a state where the vehicle 10 is tilted to pass a curve. The vehicle 10 includes a vehicle body 12, a carriage 14, an air spring 16 provided between the vehicle body 12 and the carriage 14, and a center pin 18 attached to the vehicle body 12. In addition, the vehicle 10 includes an axle that supports the wheels 20 and a coil spring 22 that is provided between the axle and the carriage 14. The wheel 20 can travel on the rail 24. A centering cylinder 26 for pulling back the lateral displacement of the vehicle body 12 between the central pin 18 integrated with the vehicle body 12 and the carriage 14, and a vehicle according to the present invention for preventing the vehicle body 12 from shaking in the lateral direction. And a gas pressure servo cylinder 30.

  FIG. 2 is a block diagram of a vehicular gas pressure servo cylinder 30 according to the present invention. The vehicle gas pressure servo cylinder 30 includes a cylinder body 40, a gas pressure generator 70 that supplies a gas having a predetermined gas pressure to the cylinder body 40, and a gas pressure generator 70 according to the output of the acceleration sensor 74. And a gas pressure control unit 72 for controlling.

  The cylinder housing 42 in the cylinder main body 40 has a substantially cylindrical shape, the inner surface has a finished surface on which the piston ring 44 can slide, and a piston rod 46 fixed to the piston ring 44 at one end thereof. Has an opening into and out of. The piston ring 44 has a substantially disk shape, and the outer periphery thereof has a finished surface that can slide in an airtight manner with the inner surface of the cylinder housing 42. The piston ring 44 and the piston rod 46 constitute a so-called piston. The cylinder housing 42 is attached to the carriage 14, and the piston rod 46 is attached to the center pin 18 integrated with the vehicle body 12.

  The first partition piston 48 and the second partition piston 50 have a generally disc-like shape with a collar, and are disposed on both sides of the piston ring 44. That is, the first partition piston 48 is between the end of the cylinder housing 42 on the carriage 14 side and the piston ring 44, and the second partition piston 50 is between the end of the cylinder housing 42 on the center pin 18 side and the piston ring 44. Be placed. A step corresponding to the flange portions of the first partition piston 48 and the second partition piston 50 is provided on the inner surface of the cylinder housing 42, and the piston rings of the first partition piston 48 and the second partition piston 50 are formed at the step portions. Movement to the 44 side is restricted. The outer periphery of the disc portion that is not the flange portion of the first partition piston 48 and the second partition piston 50 has a finished surface that can slide in an airtight manner with the inner surface of the cylinder housing 42.

  Therefore, two pressure chambers are formed before and after the piston ring 44 by the cooperation of the cylinder housing 42 and the piston ring 44. The two pressure chambers are further divided into the first partition piston 48 and the second partition piston. It is divided into two by 50. That is, the first inner pressure chamber 52 is between the piston ring 44 and the first partition piston 48, and the second inner pressure chamber 54 is between the piston ring 44 and the second partition piston 50. A first outer pressure chamber 56 is provided between the outer side and the end of the cylinder housing 42 on the carriage 14 side, and a second outer side between the outer side of the second partition piston 50 and the end of the cylinder housing 42 on the center pin 18 side. Pressure chambers 58 are respectively formed.

The gas pressure generating unit 70 has a function of supplying a gas having a predetermined gas pressure to each pressure chamber of the cylinder main body 40. For example, a servo control valve that can control the gas pressure generated by controlling the actuator is used. Can do. Specifically, the first control gas pressure P ₁ is a first inner pressure chamber 52, the second control gas pressure P ₂ is a second inner pressure chamber 54, operating gas pressure P _S is, and the first outer pressure chamber 56 Each is supplied to the first outer pressure chamber 56. The working gas pressure P _S is a raw gas pressure that is not controlled by the gas pressure control unit 72 and can be set to, for example, 8 bar.

The gas pressure control unit 72 has a function of generating an input signal to the actuator of the gas pressure generation unit 70 in accordance with the output of the acceleration sensor 74 that detects the magnitude of lateral fluctuation, and is a general control circuit. Can be configured. Specifically, F / A = 2ΔP is calculated by assuming that the force necessary to resist lateral shaking is F and the area of one side of the piston ring 44 that receives the gas pressure is A, and the bias gas pressure P _B is calculated. And a differential pressure of ± ΔP are superimposed on each other, one of which is a first control gas pressure P ₁ = P _B + ΔP, and the other is a second control gas pressure P ₂ = P _B −ΔP. The bias gas pressure P _B can be, for example, 4 bar, which is 1/2 of the working gas pressure P _S , so that P _B + ΔP does not exceed the working gas pressure P _S. In this way, the first control gas pressure P ₁ and the second control gas pressure P ₂ are obtained according to the output of the acceleration sensor 74, and an input signal to the actuator corresponding to the gas pressure is generated to generate the gas pressure generator 70. To enter.

The operation of this configuration will be described. When the vehicle 10 is bent in a running curve, for example, when the vehicle 10 is subjected to a horizontal fluctuation, the magnitude is detected by an acceleration sensor 74 provided on the center pin 18 or the like integrated with the vehicle body 12. The detected acceleration signal is input to the gas pressure control unit 72, and control signals corresponding to the first control gas pressure P ₁ and the second control gas pressure P ₂ are generated according to the magnitude, and the gas pressure generation unit 70 is generated. To be supplied. In the gas pressure generation unit 70, the first control gas pressure P ₁ and the second control gas pressure P ₂ are generated from the working gas pressure P _S and supplied to the first inner pressure chamber 52 and the second inner pressure chamber 54, respectively. . The piston ring 44 is driven by the differential pressure ΔP that is the pressure difference between the first control gas pressure P ₁ and the second control gas pressure P ₂ , and a force that resists lateral shaking is generated in the piston rod 46.

At this time, the working gas pressure P _S is supplied to the first outer pressure chamber 56 and the second outer pressure chamber 58. Since the working gas pressure P _S is higher than both the first control gas pressure P ₁ and the second control gas pressure P ₂ , both the first partition piston 48 and the second partition piston 50 are pushed toward the piston ring 44 side, It is in a state where it stops at its brim part. That is, even if the first control gas pressure P ₁ and the second control gas pressure P ₂ vary, the positions of the first partition piston 48 and the second partition piston 50 do not change within the range of ± ΔP. Therefore, the working gas flow rate required for the operating range of the piston ring 44 for suppressing the vibration can be regulated by the volume between the first partition piston 48 and the second partition piston 50.

Even if the vehicle body 12 is displaced in the lateral direction, if the vehicle body 12 is gradually displaced, the vehicle body 12 is pulled back to the neutral position by the centering cylinder 26. However, for example, in a sudden displacement such as a sharp curve or an impact, the center pin 18 is greatly displaced and the piston ring 44 is largely moved before the centering cylinder 26 responds. 3 and 4 are views showing the inside of the cylinder body 40 in such a case. FIG. 3 shows a state in which the piston ring 44 moves excessively toward the carriage 14, collides with the first partition piston 48, and moves together with the first partition piston 48 toward the first outer pressure chamber 56 side. On the contrary, FIG. 4 shows a state in which the piston ring 44 moves excessively toward the center pin 18, collides with the second partition piston 50, and moves together with the second partition piston 50 toward the second outer pressure chamber 58. Thus, when the piston ring 44 moves excessively, each partition piston, as the movement of the piston ring 44, the high pressure of the outer pressure chamber, that is, to receive operating gas pressure P _S of 8 bar. In this way, by providing the partition piston, it is possible to reduce the volume of the pressure chamber used for suppressing vibration while reducing the working gas flow rate while allowing excessive movement of the piston ring in the event of an impact or the like. be able to.

  Next, a vehicular gas pressure servo cylinder 130 according to another embodiment will be described. The vehicular gas pressure servo cylinder 130 according to this embodiment can prevent lateral shaking without the vehicle 10 having the centering cylinder 26, and can be in a neutral position even if the piston ring goes too far due to an impact or the like. It can be returned to. Since the configuration of the vehicle 10 is the same as that of FIG. 1 except for the centering cylinder 26, the same reference numerals are used for common elements, and detailed description thereof is omitted. FIG. 5 is a configuration diagram of the vehicular gas pressure servo cylinder 130 according to this embodiment. The vehicle gas pressure servo cylinder 130 includes a cylinder body 140, a gas pressure generator 170 that supplies a gas having a predetermined gas pressure to the cylinder body 140, an output of the acceleration sensor 174, and outputs of the position sensors 178 and 180. And a gas pressure control unit 172 that controls the gas pressure generation unit 170 in response.

  The cylinder housing 142 in the cylinder main body 140 has a substantially cylindrical shape, and the inner surface has a finished surface on which the piston ring 144 can slide, and a piston rod 146 fixed to the piston ring 144 at one end thereof. Has an opening into and out of. The piston ring 144 has a substantially disk shape, and the outer periphery thereof has a finished surface that can slide in an airtight manner with the inner surface of the cylinder housing 142. The piston ring 144 and the piston rod 146 constitute a so-called piston. The cylinder housing 142 is attached to the carriage 14, and the piston rod 146 is attached to the center pin 18 integrated with the vehicle body 12. Accordingly, the first pressure chamber 152 and the second pressure chamber 154 are formed before and after the piston ring 144 by the cooperation of the cylinder housing 142 and the piston ring 144.

A magnet 176 is embedded in the piston ring 144, and two position sensors 178 and 180 sensitive to magnetism are embedded in the cylinder housing 142. The positions of the position sensors 178 and 180 correspond to the position when the piston ring 144 comes to that position, but the neutral position of the piston ring 144 is set to X ₀ along the X direction shown in FIG. The operating range of the piston ring 144 when operating against the condition is preferably 2ΔX, and is preferably provided at a position of X ₀ ± ΔX. That is, it is preferable to provide _one position sensor 178 at a position of X ₁ = X ₀ −ΔX and the other position sensor 178 at a position of X ₂ = X ₀ + ΔX. For detecting the position of the piston ring, another method, for example, a method of detecting the position of the piston rod moving integrally with the piston ring by an optical sensor or the like may be used.

The gas pressure generation unit 170 has a function of supplying a gas having a predetermined gas pressure to each pressure chamber of the cylinder main body 140. For example, a servo control valve that can control the gas pressure generated by controlling the actuator is used. Can do. Specifically, the first control gas pressure P ₁ is supplied to the first pressure chamber 152, and the second control gas pressure P ₂ is supplied to the second pressure chamber 154.

  The gas pressure control unit 72 has a function of generating an input signal to the actuator of the gas pressure generation unit 70 in accordance with the outputs of the acceleration sensor 174 and the position sensors 178 and 180 that detect the magnitude of the lateral fluctuation. A general control circuit can be used. Specifically, F / A = 2ΔP is calculated and superposed on the bias gas pressure, where F is the force required to resist lateral oscillation and F is the area on one side of the piston ring 144 that receives the gas pressure. The differential pressure ± ΔP to be obtained is obtained. That is, the magnitude of the operating pressure ± ΔP is determined according to the output of the acceleration sensor 174.

On the other hand, the bias gas pressure is determined according to the outputs of the position sensors 178 and 180. FIG. 6 is a diagram showing the relationship between the position of the piston ring and the bias gas pressure, with the position of the piston ring 144 on the horizontal axis and the gas pressure on the vertical axis. When the position of the piston ring 144 is between X ₁ = X ₀ −ΔX and X ₂ = X ₀ + ΔX, the bias gas pressure can be ½ of the working gas pressure P _S. Here the operating gas pressure P _S is the raw gas pressure is not controlled gas pressure controller 72 can be, for example, 8 bar. Accordingly, the first control gas pressure P ₁ can be set to 4 bar + ΔP, and the second control gas pressure P ₂ can be set to 4 bar−ΔP.

When the position of the piston ring 144 is excessively displaced beyond the range of X ₀ ± ΔX, the bias gas pressure of the first control gas pressure P _{1 and} the bias gas pressure of the second control gas pressure P ₂ are set to different values. . For example, when the position of the piston ring 144 is excessively displaced in the −X direction from X ₀ −ΔX, the bias gas pressure of the first control gas pressure P ₁ is set to 6 bar, and the second control gas pressure P ₂ The bias gas pressure can be 2 bar. Conversely, when the position of the piston ring 144 is excessively displaced in the + X direction from X ₀ + ΔX, the bias gas pressure of the first control gas pressure P ₁ is set to 2 bar, and the bias of the second control gas pressure P ₂ is set. The gas pressure can be 6 bar. That is, by one side across the piston ring 144 for biasing the gas pressure is high lower the other side, so as to provide a force pulling back the piston ring 144 to the neutral position X _0. Therefore, in the former case, the first control gas pressure P ₁ = 6 bar + ΔP and the second control gas pressure P ₂ = 2 bar−ΔP, and in the latter case, the first control gas pressure P ₁ = 2 bar + ΔP. Second control gas pressure P ₂ = 6 bar-ΔP.

Thus, the gas pressure control unit 172 obtains the differential pressure ± ΔP for the first control gas pressure P ₁ and the second control gas pressure P ₂ according to the output of the acceleration sensor 174, and outputs the position sensors 178 and 180. In response, the bias gas pressure in the direction to return the piston ring 144 to the neutral position is obtained, and an input signal to the actuator corresponding to the first control gas pressure P ₁ and the second control gas pressure P ₂ obtained from these is generated, Input to the gas pressure generator 170.

The operation of this configuration will be described. When the vehicle 10 is bent in a running curve or the like, when the vehicle 10 is subjected to a lateral fluctuation, the magnitude is detected by an acceleration sensor 174 provided on a center pin 18 or the like integrated with the vehicle body 12, and the position of the piston ring 144 is detected. Is detected by the position sensors 178 and 180. These data are input to the gas pressure control unit 172. When the outputs of the position sensors 178 and 180 are zero, the position of the piston ring 144 is between X ₁ = X ₀ −ΔX and X ₂ = X ₀ + ΔX. Is set to the same value, for example 4 bar. A control signal corresponding to the first control gas pressure P ₁ and the second control gas pressure P ₂ is generated by superimposing a differential pressure ± ΔP corresponding to the magnitude of the acceleration signal on the bias gas pressure, and a gas pressure generator 170.

In the gas pressure generation unit 170, the first control gas pressure P ₁ and the second control gas pressure P ₂ are generated from the working gas pressure P _S and supplied to the first pressure chamber 152 and the second pressure chamber 154, respectively. The piston ring 144 is driven by the differential pressure ΔP that is the pressure difference between the first control gas pressure P ₁ and the second control gas pressure P ₂ , and a force that resists lateral shaking is generated in the piston rod 146.

When the vehicle body 12 is suddenly displaced due to a sharp curve, an impact, or the like, the piston ring 144 moves greatly, and outputs appear in the position sensors 178 and 180. This is shown in FIGS. FIG. 7 shows a case where the position of the piston ring 144 goes too far in the −X direction from X ₁ = X ₀ −ΔX, and the output that the position sensor 178 detects the magnet 176 appears. This is when the position 144 is excessively moved in the + X direction from X ₁ = X ₀ + ΔX, and the output of the position sensor 180 detecting the magnet 176 appears. In these cases, as described with reference to FIG. 6, in the gas pressure control unit 172, according to the outputs of the position sensors 178 and 180, the bias gas pressure is increased on one side with the piston ring 144 between, and the other side is decreased. and as indicated by the arrows in FIG. 8, control is performed so as to provide a force pulling back the piston ring 144 to the neutral position X _0.

  In this way, by providing a position sensor that detects the position of the piston ring in the vehicular gas pressure servo cylinder, it is possible to satisfactorily prevent lateral shaking, and even if the piston ring goes too far due to impact etc., the neutral position Can be returned to. That is, it is not necessary to separately provide a special means such as a centering cylinder for returning the vehicle to the neutral position, in addition to the gas pressure servo cylinder, and the configuration of the entire vehicle can be simplified.

In the above description, the case where the position sensors are arranged at both ends of the operating range of the piston ring when operating against the lateral shaking has been described. Instead of discretely arranging the position sensors in this way, a linear position sensor that continuously detects the position of the piston ring may be used. In this case, the neutral position of the piston ring can be continuously compared with the detected position detected by the position sensor. Therefore, the bias gas pressure can be continuously changed according to the position of the piston ring. This is shown in FIG. FIG. 9 shows the position X of the piston ring on the horizontal axis and the gas pressure on the vertical axis. The solid line indicates the first control gas pressure P ₁ and the broken line indicates the second control gas pressure P ₂ . As shown in FIG. 9, the change direction of the bias gas pressures P _B1 and P _B2 with respect to the position of the piston ring is set so as to be reversed between the first control gas pressure P ₁ and the second control gas pressure P ₂ . As a result, even if the piston ring is displaced from the neutral position, it is possible to generate a force that resists lateral shaking while acting to restore the piston ring.

  10 includes a first partition piston 48 and a second partition piston 50, and further includes a magnet 176 embedded in the piston ring 144 and position sensors 178 and 180 embedded in the cylinder housing 242. 230 is a block diagram of FIG. The vehicular gas pressure servo cylinder 230 is a combination of the first embodiment and the second embodiment, and the action thereof is also a combination of the first and second embodiments. That is, if the piston ring 144 goes excessively, it is received by the first partition piston 48 and the second partition piston 50. At the same time, the position of the piston ring 144 is detected by the position sensors 178 and 180, and the bias gas pressure is changed by the gas pressure control unit 272 so as to return to the original neutral position.

  As already described, in the first embodiment, the action of the first partition piston 48 and the second partition piston 50 makes it possible to reduce the pressure chamber for generating the force against the lateral shaking, thereby reducing the working gas flow rate. However, a centering cylinder is required to restore the displacement of the piston ring 144. On the other hand, in the second embodiment, the centering cylinder can be made unnecessary by providing the position sensors 178 and 180, but the pressure chamber for generating the force against the lateral shaking cannot be reduced. On the other hand, according to the vehicular gas pressure servo cylinder 230 shown in FIG. 10, it is possible to reduce the working gas flow rate for generating a force that resists the lateral shaking of the vehicle body, and further, there is provided means for returning to the original neutral position. It is not necessary to prepare separately, and the configuration of the entire vehicle can be simplified.

  As described above, according to the gas pressure servo cylinder for a vehicle according to the present invention, for example, in the first and third embodiments, the excessive movement of the piston ring can be absorbed by an action of the partition piston in the event of an impact or the like. In 2 and 3, excessive movement of the piston ring can be pulled back to the neutral position by using the position sensor. Accordingly, it is possible to detect the shaking of the vehicle body directly by the acceleration sensor without monitoring the displacement, and to control the gas supplied to the gas pressure servo cylinder for the vehicle based on this, thereby preventing the shaking.

  FIG. 11 is a diagram illustrating a configuration of a vehicle 310 including the vehicle shake prevention device 360 according to the present invention. Elements similar to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 11, the acceleration sensor 374 is provided at a location suitable for detecting the lateral shaking of the vehicle body 12. The position may not be the center pin 18 shown in FIG. 2, and may be, for example, the position of the floor of the vehicle body or the height of the passenger seat. An acceleration signal related to the shaking of the vehicle body detected by the acceleration sensor 374 is input to the controller 372.

  The controller 372 has a function of controlling the movement of the vehicle body in order to improve the ride comfort of the vehicle body. Here, at least the acceleration signal detected by the acceleration sensor 374 is arithmetically processed to generate a signal suitable for controlling the control valve 370. 2, 5, and 10, gas pressure control units 72, 172, and 272 are shown as corresponding to the controller 372.

  The control valve 370 is a servo valve that opens and closes according to the output signal of the acceleration sensor calculated by the controller 372, and has a function of controlling the gas supplied to the vehicle gas pressure servo cylinder 30 by the opening and closing. Have. As the control valve 370, a direct acting servo valve or the like can be used. In FIGS. 2, 5, and 10, gas pressure generating units 70, 170, and 270 are shown as corresponding to the control valve 370.

  Thus, by mounting the vehicle shake prevention device 360 on the vehicle 310, the shake can be detected by the acceleration sensor 374, and the shake can be more effectively suppressed by the vehicle gas pressure servo cylinder 30.

  It can be used in servo cylinders that suppress lateral fluctuations to improve the ride comfort of the vehicle. Further, this servo cylinder can be used for a vehicle shake prevention device. Furthermore, it can utilize for a vehicle using this vehicle shake prevention apparatus.

1 is a configuration diagram of a vehicle to which a vehicular gas pressure servo cylinder according to the present invention is applied. It is a lineblock diagram of the gas pressure servo cylinder for vehicles in the embodiment concerning the present invention. In embodiment which concerns on this invention, it is a figure explaining the effect | action of a partition piston. In embodiment which concerns on this invention, it is a figure explaining the effect | action of a partition piston. It is a block diagram of the gas pressure servo cylinder for vehicles which concerns on other embodiment. In other embodiment, it is the figure which showed the relationship between the position of a piston ring, and bias gas pressure. In other embodiment, it is a figure which shows a mode that it is pulled back when a piston ring moves large. In other embodiment, it is a figure which shows a mode that it is pulled back when a piston ring moves large. It is a figure which shows the example which changes a bias gas pressure continuously as a deformation | transformation in other embodiment according to the position of a piston ring. It is a block diagram of the gas pressure servo cylinder for vehicles which concerns on other embodiment. It is a lineblock diagram of vehicles provided with a vehicle shake prevention device in an embodiment concerning the present invention.

Explanation of symbols

  10, 310 Vehicle, 12 Car body, 14 Bogie, 16 Air spring, 18 Center pin, 22 Coil spring, 26 Centering cylinder, 30, 130, 230 Gas pressure servo cylinder for vehicle, 40, 140, 240 Cylinder body, 42, 142,242 Cylinder housing, 44,144 Piston ring, 46 Piston rod, 48, 50 Partition piston, 52 First inner pressure chamber, 54 Second inner pressure chamber, 56 First outer pressure chamber, 58 Second outer pressure chamber , 70, 170, 270 Gas pressure generation unit, 72, 172, 272 Gas pressure control unit, 74, 174, 374 Acceleration sensor, 152 First pressure chamber, 154 Second pressure chamber, 176 Magnet, 178, 180 Position sensor, 370 Control valve, 372 controller.

Claims (5)

In the gas pressure servo cylinder, which is provided between the bogie and the vehicle body of the vehicle on which the vehicle body is placed via the air spring or the coil spring on the bogie and generates a force against the lateral shaking of the vehicle body,
A cylinder housing fixed to either the carriage or the vehicle body;
A piston having a piston rod fixed to either the carriage or the vehicle body, and a piston ring connected to the piston rod and capable of sliding inside the cylinder housing;
Pressure chambers formed before and after the piston ring by the cooperation of the piston and the cylinder housing, and each pressure chamber is partitioned into an inner pressure chamber on the piston ring side and an outer pressure chamber on the outer side thereof by a partition piston. A pressure chamber,
Including
The piston generates a force that resists shaking by a differential pressure that is a difference in gas pressure to each inner pressure chamber supplied according to the magnitude of the shaking,
The partition piston receives a high gas pressure in the outer pressure chamber as the piston ring moves when the piston ring moves excessively. A gas pressure servo cylinder that is provided between a carriage and a vehicle body in a vehicle in which the vehicle body is mounted on the carriage via an air spring or a coil spring, and generates a force that resists lateral shaking of the vehicle body,
A cylinder housing fixed to either the carriage or the vehicle body;
A piston having a piston rod fixed to either the carriage or the vehicle body, and a piston ring connected to the piston rod and capable of sliding inside the cylinder housing;
A pressure chamber formed before and after the piston ring by cooperation of the piston and the cylinder housing;
A position sensor for detecting the position of the piston ring;
A gas pressure control unit for controlling the gas pressure supplied to each pressure chamber;
Including
The gas pressure control unit compares the neutral position of the piston ring with the detection position, sets the bias gas pressure supplied to each pressure chamber in the direction to return the piston ring to the neutral position, and oscillates with respect to each bias gas pressure. A gas pressure servo cylinder for a vehicle, characterized in that a gas pressure supplied to each pressure chamber is controlled by superposing a differential pressure corresponding to the size of the cylinder.   3. The vehicular gas pressure servo cylinder according to claim 2, wherein each pressure chamber is partitioned by a partition piston into an inner pressure chamber on the piston ring side and an outer pressure chamber on the outer side thereof, and the partition piston has an excessive piston ring. A vehicular gas pressure servo cylinder which moves to the outer pressure chamber side as the piston ring moves when moved. A vehicle gas pressure servo cylinder according to any one of claims 1 to 3,
An acceleration sensor that detects the shaking of the vehicle body,
A controller for computing the output signal of the acceleration sensor;
A control valve that opens and closes according to the output signal of the acceleration sensor that has been arithmetically processed by the controller, and controls the gas pressure supplied to the vehicle gas pressure servo cylinder;
A vehicle shake prevention device comprising: A vehicle comprising the vehicle anti-sway device according to claim 4.

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