JP2008049907A - Vehicle body supporting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body supporting device for retracting a vehicle body against transverse displacement capable of miniaturizing each element by using mechanical feedback. <P>SOLUTION: The vehicle body supporting device 40 comprises a cylinder casing 42 connected to a truck 14, a piston rod 46 connected to a center pin 18 integrated with a vehicle body, and a piston head 44 provided at one end of the piston rod 46. A piston is formed of a sleeve, and a spool 6 with one end thereof fixed to the cylinder casing 42 and a land 62 formed at the other end is formed in the sleeve. The sleeve of the piston and the spool 60 have the function of a selector valve having the function of changing the state of gas pressure in two gas chambers 48, 50 of a gas pressure cylinder according to the transverse movement of a vehicle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle body support device, and more particularly, to a vehicle body support device including a fluid pressure cylinder provided between a vehicle carriage and a vehicle body.

  2. Description of the Related Art In track vehicles as urban traffic or high-speed mass transportation means, a structure in which a vehicle body is supported on a carriage by an air spring or a coil spring is widely used to ensure a comfortable riding comfort. In this case, since the weight of the vehicle body is always applied to the air spring or the coil spring, the support force against the longitudinal displacement of the vehicle body can be optimized. On the other hand, the lateral stiffness of the air spring or coil spring is insufficient with respect to the lateral displacement of the vehicle body. For example, the lateral displacement of the vehicle when the vehicle passes through a curved road at a high speed It is difficult to support only with a spring.

  Therefore, a stopper rubber is provided between the carriage and the vehicle body to suppress lateral displacement of the vehicle body beyond a certain level. Further, an air cylinder is provided between the carriage and the vehicle body, and the vehicle body is pulled back to the center position according to the lateral displacement.

  For example, Patent Document 1 discloses that a constant air pressure is applied to the air cylinder and the left and right cylinder chambers of the air cylinder as a vehicle body support device that generates lateral rigidity with respect to the lateral displacement of the vehicle body between the carriage and the vehicle body of the vehicle. A configuration having a guide valve to be supplied and a mechanical feedback system for feeding back a lateral displacement to the guide valve is disclosed. Here, the mechanical feedback system includes a slide cylinder pushed laterally by an arm connected to the piston of the air cylinder, a push piece movable in the slide cylinder, and a push piece left in the slide cylinder. Including a spring. The push piece is in contact so that the spool of the guide valve can be pushed, and the movement range of the spool of the guide valve is a stopper that restricts the movement of the push piece in the left direction and the right direction of the slide cylinder. Is restricted to be less than the movement range of the arm. It is stated that this can reduce the size of the guide valve.

  An example of a pneumatic cylinder for forcibly inclining a pendulum beam that supports a vehicle body in a pendulum vehicle is disclosed in Patent Document 2 as a displacement sensor that detects expansion and contraction in a pneumatic cylinder that expands and contracts by introduction of air pressure. A configuration with a built-in is disclosed. Here, a sensor rod with a built-in magnetostrictive line is provided extending axially from the end plate of the pneumatic cylinder in the axial direction, and the end of the signal that travels along the magnetostrictive line is rebounded by a permanent magnet fixed to the piston. It is stated that the position of the piston from the plate is detected. In order to precisely control the air pressure supplied to the pneumatic cylinder according to the position of the piston, a pneumatic servo valve having a drive mechanism using a coil and a permanent magnet is used.

Japanese Patent No. 3749928 Japanese Patent Laid-Open No. 10-129478

  As described above, the fluid pressure cylinder provided between the carriage and the vehicle body in order to return the vehicle body to the center position according to the lateral displacement is called a centering cylinder. In order to operate the centering cylinder in accordance with the lateral displacement, feedback of the lateral displacement is performed. In Patent Document 1, a simple mechanical feedback system that does not involve an electric system is used as the feedback system. However, since the entire structure is configured by combining the elements of the air cylinder, the guide valve, and the mechanical feedback system, it is complicated. It has become a structure. In Patent Document 2, a sensor is built in a pneumatic cylinder, but the pneumatic pressure is precisely controlled using an electrical feedback system to tilt the pendulum, and is not an example of a centering cylinder that simply pulls back the vehicle body.

  An object of the present invention is to provide a vehicle body support device capable of compactly collecting each element in a centering cylinder using mechanical feedback.

  A vehicle body support device according to the present invention includes a cylinder housing connected to either the vehicle body side or the trolley side of a vehicle and a piston portion connected to the other side of the vehicle body side or the trolley side of the vehicle. The pressure cylinder and the piston part of the fluid pressure cylinder are used as a sleeve, and have a spool fixed to the cylinder housing and relatively movable in the sleeve. The direction of movement of the spool relative to the sleeve caused by the lateral movement of the vehicle And a control switching valve for switching the expansion / contraction direction of the fluid pressure cylinder according to the above.

  Further, in the vehicle body support device according to the present invention, the two gas chambers partitioned by the cylinder housing and the piston head of the piston portion are defined as a head side gas chamber and a rod side gas chamber, and the head side gas chamber and the rod side gas chamber are provided. Each control gas pressure is supplied, and the control switching valve opens the rod side gas chamber to the atmosphere when the lateral movement direction of the vehicle is from the rod side gas chamber to the head side gas chamber by the cooperation of the sleeve and the spool. The fluid pressure cylinder is extended in the direction of the rod side gas chamber. When the lateral movement direction of the vehicle is from the head side gas chamber to the rod side gas chamber, the head side gas chamber is opened to the atmosphere, and the fluid pressure cylinder Is preferably extended in the direction of the head-side gas chamber.

  In the vehicle support device according to the present invention, when the relative positional relationship between the sleeve and the spool is in the neutral position, the rod-side gas chamber and the head-side gas chamber do not release the atmosphere to the control switching valve. The rod-side gas chamber or the head-side gas chamber is preferably opened to the atmosphere when a predetermined control switching distance is moved from the neutral position with respect to the sleeve.

  Further, in the vehicle body support device according to the present invention, when the relative positional relationship between the sleeve and the spool is in the neutral position, the rod-side gas chamber and the head-side gas chamber communicate with each other, and the spool is in a predetermined position from the neutral position with respect to the sleeve. It is preferable to have a communication switching valve that stops communication between the rod side gas chamber and the head side gas chamber when the communication switching distance is moved.

  Further, in the vehicle body support device according to the present invention, the communication switching groove provided in the sleeve for the communication switching valve is preferably provided at a circumferential position different from the control switching groove provided in the sleeve for the control switching valve. . The communication switching valve is preferably opened to the atmosphere together with the communication.

  With the above configuration, the piston portion of the fluid pressure cylinder provided between the vehicle body side and the carriage side of the vehicle is used as a sleeve, and the spool is fixed to the cylinder housing and relatively movable in the sleeve. A control switching valve is provided for switching the expansion / contraction direction of the fluid pressure cylinder in accordance with the moving direction of the spool relative to the sleeve generated by the lateral movement. As described above, since the control switching valve composed of the spool and the sleeve that move relatively by the lateral movement of the vehicle is built in the fluid pressure cylinder, each element is made compact by using mechanical feedback. It is put together.

  Further, when the control gas pressure is supplied to the head side gas chamber and the rod side gas chamber of the fluid pressure cylinder, respectively, and the lateral movement direction of the vehicle is from the rod side gas chamber to the head side gas chamber by the control switching valve. The fluid pressure cylinder is extended in the direction of the rod side gas chamber by opening the rod side gas chamber to the atmosphere. Conversely, when the lateral movement direction of the vehicle is from the head side gas chamber to the rod side gas chamber, the fluid pressure cylinder is extended in the direction of the head side gas chamber by opening the head side gas chamber to the atmosphere. In this way, the laterally moving vehicle can be pulled back to the center position using mechanical feedback.

  Further, when the vehicle is in the neutral position and the relative positional relationship between the sleeve and the spool is in the neutral position, neither the rod-side gas chamber nor the head-side gas chamber is released to the atmosphere, and the spool is predetermined from the neutral position with respect to the sleeve. The rod side gas chamber or head side gas chamber is opened to the atmosphere when the control switching distance is moved, so that when the vehicle moves laterally beyond the predetermined control switching distance from the neutral position, the fluid The pull-back thrust of the pressure cylinder operates in earnest. As a result, it is possible to prevent the fluid pressure cylinder from being pulled back left and right in the vicinity of the neutral position.

  In addition, a communication switching valve is provided so that when the vehicle is in the neutral position and the relative positional relationship between the sleeve and the spool is in the neutral position, the rod side gas chamber and the head side gas chamber communicate with each other, and the spool is neutral with respect to the sleeve. When the predetermined communication switching distance is moved from the position, the communication between the rod side gas chamber and the head side gas chamber is stopped, so that no thrust force for pulling back the vehicle is generated in the range of the predetermined communication switching distance from the neutral position. Accordingly, it is possible to suppress the generation of the offset thrust generated due to the imbalance in the balance between the rod side gas chamber and the head side gas chamber, while being in the neutral position.

  Further, the communication switching groove provided in the sleeve for the communication switching valve is provided at a different circumferential position from the control switching groove provided in the sleeve for the control switching valve. And can be done.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the fluid used in the vehicle body support device will be described as a gas. Here, air, nitrogen, inert gas, or the like can be used as the gas. Of course, in some cases, a fluid other than a gas, such as oil or water, may be used. Therefore, in the following description, the fluid pressure cylinder constituting the vehicle body support apparatus will be described as a gas pressure servo cylinder. However, the present invention can be applied to the case of using a fluid other than gas.

  Moreover, as a track vehicle to which the vehicle body support device is applied, a coil spring as a primary spring is provided between the carriage portion and the axle, and an air spring as a secondary spring is provided between the carriage portion and the vehicle body portion. Although it demonstrates as a thing of the structure provided, springs other than this, for example, springs, such as a leaf | plate spring, may be used, and the attachment position of other springs may be sufficient. Further, the vehicle may be a pendulum vehicle including a pendulum beam that supports the vehicle body portion and a cart portion that supports the pendulum beam on the rail so that the pendulum beam can be tilted through the tilting means.

  Further, the position on the vehicle where the vehicle body support device is provided is a space between the carriage portion and the vehicle body portion, and in particular, a structure in which the cylinder housing of the gas pressure cylinder is connected to the carriage portion and the piston rod is connected to the vehicle body portion. However, other arrangements may be used. For example, the cylinder housing of the gas pressure cylinder may be connected to the vehicle body portion, and the piston rod may be connected to the carriage portion. That is, any arrangement configuration in which the cylinder housing is connected to either the vehicle body side or the trolley side of the vehicle and the piston portion, particularly the piston rod, is connected to the other side of the vehicle body side or the trolley side of the vehicle. As described above, the trolley portion refers to a portion of the trolley structure such as a trolley frame above the primary spring of the vehicle, and the vehicle body portion refers to the structural portion of the vehicle body or bolster above the secondary spring of the vehicle. Pointing.

  FIG. 1 is a configuration diagram of a vehicle 10 to which a vehicle body support device 40 according to the present invention is applied. The vehicle 10 includes a vehicle body portion 12, a carriage portion 14, an air spring 16 as a secondary spring provided between the vehicle body portion 12 and the carriage portion 14, and a center pin 18 attached to the vehicle body portion 12. Prepare. Further, the vehicle 10 includes an axle that supports the wheels 20 and a coil spring 22 as a primary spring provided between the axle and the carriage unit 14. The wheel 20 can travel on the rail 24. And between the center pin 18 integrated with the vehicle body part 12 and the carriage part 14, the vehicle body support device 40 as a centering cylinder for pulling back the lateral displacement of the vehicle body part 12, the lateral displacement of the vehicle body part 12, etc. And a damper 26 having a function of absorbing. In addition, a stopper rubber 28 is provided between the center pin 18 and the carriage unit 14 to suppress excessive collision between the vehicle body unit 12 and the carriage unit 14 due to the lateral displacement of the vehicle body unit 12. The direction of lateral displacement is indicated by an arrow with the X direction. In FIG. 2 and subsequent figures, the X direction is indicated by an arrow as necessary.

  2A and 2B are cross-sectional views of the vehicle body support device 40 as a centering cylinder. FIG. 2A is a plan cross-sectional view, and FIG. Differences in the two cross-sectional views that differ from each other by 90 degrees in the angle around the axial direction are switching grooves 82 and 80 and exhaust openings 56 and 57, which will be described later. These switching grooves 82 and 80 are formed so as not to overlap each other, and these exhaust openings 56 and 57 are also formed so as not to overlap each other. The vehicle body support device 40 is a device having a function of pulling the vehicle body back to the neutral position using the gas pressure when the vehicle body is displaced laterally. The vehicle body support device 40 is one gas pressure cylinder in appearance, but incorporates a control switching valve that switches the expansion / contraction direction of the gas pressure cylinder in accordance with the direction in which the vehicle moves in the lateral direction inside the gas pressure cylinder. . Specifically, the piston portion of the gas pressure cylinder is a sleeve, and a spool that is fixed to the cylinder housing of the gas pressure cylinder is provided in the sleeve. The vehicle body support device 40 itself has a function of performing mechanical feedback by the relative movement between the sleeve and the spool caused by the lateral movement of the vehicle and switching the state of the two gas chambers of the gas pressure cylinder. ing.

  As shown in FIGS. 2A and 2B, the vehicle body support device 40 includes a cylinder housing 42 connected to the carriage unit 14 of the vehicle and a piston connected to the center pin 18 integrated with the vehicle body. A piston / cylinder mechanism having a rod 46 and a piston head 44 provided at one end of the piston rod 46, wherein the cylinder is formed by a differential pressure between two gas chambers 48 and 50 formed before and after the piston head 44. This is a type of pneumatic cylinder that can move the piston head 44 and the piston rod 46 relative to the housing 42. Here, the piston head 44 and the piston rod 46 constitute a piston portion.

  A spool 60 having a piston portion as a sleeve and having one end fixed to the cylinder housing 42 and a land portion 62 at the other end is provided in the sleeve. The sleeve of the piston part and the spool 60 have a function of a switching valve having a function of switching the gas pressure states of the two gas chambers 48 and 50 of the gas pressure cylinder in accordance with the lateral movement of the vehicle. In that sense, the vehicle body support device 40 is a gas pressure cylinder with a built-in switching valve.

  The cylinder housing 42 has a substantially cylindrical shape, and an inner surface has a finished surface on which the piston head 44 can slide, and an opening through which a piston rod 46 fixed to the piston head 44 is inserted and removed. Part. The piston head 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. As described above, the piston head 44 and the piston rod 46 constitute a so-called piston portion. As described above, the cylinder housing 42 is attached to the carriage portion 14, and the piston rod 46 is attached to the center pin 18 that is integral with the vehicle body portion 12.

Therefore, two gas chambers 48 and 50 are formed in front of and behind the piston head 44 by the cooperation of the cylinder housing 42 and the piston head 44. Here, the two gas chambers 48 and 50 are distinguished, and the gas chamber located on the front side of the piston head 44 is called a head side gas chamber 48, and the back side of the piston head 44, that is, the piston rod 46 and the cylinder housing 42. The gas chamber formed by the above will be referred to as a rod side gas chamber 50. At one end of the cylinder housing 42, the head-side air supply port 52 for supplying the supply gas pressure P _S in the head-side gas chamber 48 is provided, the other end feed gas pressure P to the rod-side air chamber 50 in the A rod-side air supply port 54 for supplying _S is provided. As shown in FIG. 2, one end of the cylinder housing 42 is a side connected to the carriage unit 14, and the other end is a side of the lid that covers the opening from which the piston rod 46 protrudes, that is, the piston rod on the center pin 18. 46 is a connected side. The head side air supply port 52 and the rod side air supply port 54 are preferably provided with appropriate throttle portions, respectively. An appropriate orifice mechanism can be used as the throttle portion.

The details of the state of the switching valve by the sleeve / spool mechanism built in the vehicle body support device 40 will be described with reference to FIG. FIG. 3 is an enlarged plan sectional view enlarging a part of FIG. 2 (a), and a portion of the sleeve / spool mechanism is shown with hatching in particular. The spool 60 of the sleeve / spool mechanism is an elongated member having a gas flow channel 66 therein, and one end thereof is attached and fixed to one end of the cylinder housing 42. The other end is a land portion 62 having a larger outer diameter than other portions. The portion other than the land portion 62 of the spool 60 corresponds to a so-called stem portion. The total length of the spool 60 in the axial direction is a length that allows the vehicle body support device 40 to move relative to a sleeve formed in the piston rod 46 within an expansion / contraction range in which the body support device 40 is restricted by the stopper rubber 28. Set within. The gas flow channel 66 has a portion where the spool 60 is attached to the cylinder housing 42 as one end, extends from the inside of the spool 60 toward the land portion 62, and has an opening at the tip of the land portion 62 as the other end. A connection port 64 that opens toward the head-side gas chamber 48 is provided at one end of the gas flow channel 66. Accordingly, the gas flow path 66, the gas pressure of the head-side gas chamber 48 as P _H, the gas pressure P _H through an opening in the distal end of the land portion 62, functions to guide the first air chamber 70 to be described later in the sleeve spool mechanism Have

  A part of the piston part is used for the sleeve of the sleeve / spool mechanism. That is, an internal hole for guiding the spool 60 is provided along the axial center of the piston portion, and the sleeve is formed inside the piston portion with the inner wall of the internal hole serving as a support inner wall where the sleeve supports the spool 60. . Specifically, a guide hole for movably supporting the stem portion of the spool 60 is provided at the position of the central axis of the piston head 44 of the piston portion, and this guide hole is the other end along the central axis of the piston rod 46. That is, it extends toward the connection side to the center pin 18 described with reference to FIG. 2, and the hole diameter is enlarged in order to support the land portion 62 of the spool 60 on the way.

  Two gas chambers 70 and 72 are formed by an inner wall provided inside the piston portion for supporting the land portion 62 and the land portion 62. Here, the two gas chambers 70 and 72 are distinguished from each other, the gas chamber located on the front side of the land portion 62 is referred to as a first gas chamber 70, and the gas chamber formed on the back side of the land portion 62 is referred to as a second gas chamber. 72. As shown in FIG. 3, the second gas chamber 72 is formed on the piston head 44 side rather than the first gas chamber 70.

As described above, the first gas chamber 70, the gas pressure P _H of the head-side gas chamber 48 is guided by the gas flow path 66 of the spool 60. The second gas chamber 72 is provided with a connection port 74 that opens toward the rod-side gas chamber 50. Therefore, in the second gas chamber 72, via the connecting port 74, the gas pressure in the rod side air chamber 50 as _{P R,} it is derived gas pressure _{P R.}

As described above, in the sleeve / spool mechanism, the gas pressure P _{H in} the head side gas chamber 48 and the gas pressure P in the rod side gas chamber 50 are respectively provided in the two gas chambers 70 and 72 before and after the land portion 62 of the spool 60. _R is derived. Turning now to the arrangement order of the gas chamber having a gas chamber and the gas pressure P _R having gas pressure P _H, it is reversed with the piston-cylinder mechanism and the sleeve spool mechanism. That is, in the piston-cylinder mechanism, one end of the gas chamber 48 is a cylinder housing 42 having a gas pressure P _H, i.e. while it is side connected to the carriage unit 14 described with reference to FIG. 2, the sleeve spool in mechanism, it is the side gas chamber 70 having a gas pressure P _H is connected the other end of the cylinder housing 42, i.e. the center pin 18 integral with the body portion 12 described in FIG.

  Switching grooves 80 and 82 having a function of switching the gas flow in cooperation with the outer periphery of the land portion 62 of the spool 60 are provided on the inner wall of the sleeve provided inside the piston portion. In FIG. 3, the switching groove 82 is shown, and the switching groove 80 is shown in the front view of FIG. 2B viewed from the direction orthogonal to the plan view of FIG.

The two switching grooves 80 and 82 have different functions. Switching groove 80, the gas pressure of the head-side gas chamber 48, or the rod-side air chamber 50, or the supply gas pressure P _S, switched or atmospheric pressure, thereby controlling the expansion and contraction of the body supporting device 40 functions Have On the other hand, the switching groove 82 switches whether the head side gas chamber 48 and the rod side gas chamber 50 communicate with each other, and thereby, between the head side gas chamber 48 and the rod side gas chamber 50 in the neutral position. It has the function of eliminating the gas pressure difference. Therefore, paying attention to the difference between these functions, the former switching groove is called the control switching groove 80 and the latter switching groove is called the communication switching groove 82. As described above, the control switching groove 80 and the communication switching groove 82 are provided at different circumferential positions on the inner wall of the sleeve.

  Returning to FIG. 2, when the control switching groove 80 and the communication switching groove 82 are compared with the length along the axial direction of the land portion 62, the groove length of the control switching groove 80 is along the axial direction of the land portion 62. The length of the communication switching groove 82 is shorter than the length along the axial direction of the land portion 62. The arrangement of the control switching groove 80 and the communication switching groove 82 is such that there is no lateral displacement of the vehicle and the center of the land portion 62 is in the neutral position of the piston / cylinder mechanism when the vehicle body portion 12 is in the neutral position with respect to the carriage portion 14. It is set so that the center part of the groove length of these grooves comes to the part. 2 and 3 show the arrangement state of each element in such a neutral state of the vehicle.

  For example, as shown in FIG. 3 which is an enlarged view of FIG. 2A, the arrangement along the axial direction of the communication switching groove 82 is set so that the land portion 62 is exactly at the center of the groove length. Yes. Since the groove length of the communication switching groove 82 is longer than the axial length of the land portion 62, the communication switching groove 82 is not blocked by the land portion 62 in this state, and therefore the gas chambers 70 and 72 on both sides of the land portion 62 are Communication is performed by the communication switching groove 82.

  As shown in FIG. 3, the communication switching groove 82 is opened to the atmosphere via the exhaust opening 56. However, in terms of the function of balancing the gas pressures of the first gas chamber 70 and the second gas chamber 72, the communication switching groove 82 only needs to fluidly communicate the first gas chamber 70 and the second gas chamber 72. So it does not have to be open to the atmosphere. For example, an appropriate exhaust throttle can be provided between the communication switching groove 82 and the exhaust opening 56. Alternatively, an appropriate exhaust throttle may be provided outside the exhaust opening 56. Thereby, in the neutral state, the first gas chamber 70 and the second gas chamber 72 can be communicated with each other at a pressure higher than the atmospheric pressure. An appropriate orifice mechanism or the like can be used as the exhaust throttle.

Further, as shown in FIG. 2B, in the neutral state, the arrangement along the axial direction of the control switching groove 80 is set so that the land portion 62 is exactly at the center of the groove length. Since the groove length of the control switching groove 80 is shorter than the axial length of the land portion 62, in this state, the control switching groove 80 is blocked by the land portion 62. Therefore, the gas chambers 70 and 72 on both sides of the land portion 62 are , independent of the gas pressure _P H, maintains the _{P R.}

  The control switching groove 80 is opened to the atmosphere through the exhaust opening 57 as shown in FIG. If necessary, an appropriate throttle portion may be provided between the control switching groove 80 and the exhaust opening 57. An appropriate orifice mechanism or the like can be used as the throttle portion. Since the groove length of the control switching groove 80 is shorter than the axial length of the land portion 62, the land portion 62 blocks the control switching groove 80 in the neutral state as described above, but the vehicle receives a lateral displacement and is neutral. When it comes off, the land portion 62 may not block a part of the control switching groove 80. If the difference between the axial length of the land portion 62 and the groove length of the control switching groove 80 is 2δ, when the displacement of the piston rod 46 with respect to the cylinder housing 42 exceeds ± δ, the land portion 62 A part is lost.

  In this way, δ is a half distance of (the axial length of the land portion 62−the groove length of the control switching groove 80), and this indicates which gas chamber is opened to the atmosphere in the control switching groove 80. Since this is the limit distance for switching whether or not, this can be called a control switching distance. Further, in order to interlock the switching in the control switching groove 80 and the switching in the communication switching groove 82, if half the distance (the groove length of the communication switching groove 82−the axial length of the land portion 62) is δ. Good. Here, since δ is a limit distance of whether or not the communication between the gas chambers on both sides in the communication switching groove 82 is communicated through the atmosphere release, this can be called a communication switching distance. Of course, the switching in the control switching groove 80 and the switching in the communication switching groove 82 may not be interlocked. In this case, the control switching distance and the communication switching distance are set to be different from each other.

When the + X direction and the −X direction shown in FIG. 2B are used and the piston rod 46 is displaced by δ or more in the + X direction with reference to the cylinder housing 42, the control switching groove 80 provided in the piston rod 46. Moves in the + X direction with respect to the land portion 62. If the amount of movement is equal to or greater than δ, the control switching groove 80 communicates with the first gas chamber 70 and opens to the atmosphere via the exhaust opening 57. As described above, the first gas chamber 70, since communication with the head-side gas chamber 48 through the gas passage 66 of the spool 60, whereby, the gas pressure P _H of the head-side gas chamber 48 is atmospheric pressure Released. At this time, since the control switching groove 80 does not communicate with the second gas chamber 72, the rod-side gas chamber 50 communicated with the second gas chamber 72 via the connection port 74 has a rod-side air supply. The gas pressure (P _S ) supplied from the port 54 is maintained as it is. Therefore, a differential pressure of (gas pressure P _S −atmospheric pressure) is generated on the left and right of the piston head 44, and the piston head 44 and the piston rod 46 move in the −X direction due to the thrust in the piston head 44−X direction. A vehicle laterally displaced in the direction can be pulled back in the -X direction. Similarly, when the piston rod 46 is displaced by δ or more in the −X direction, a pull back thrust can be generated in the + X direction.

  In this way, the control switching groove 80 has a function of switching whether to open the gas chambers 70 and 72 on both sides of the land portion 62 to the atmosphere in cooperation with the land portion 62. Since this function is similar to the function of the switching valve that switches the state of the gas flow, the function of cooperation between the control switching groove 80 and the land portion 62 can be called the function of the control switching valve. Similarly, the communication switching groove 82 has a function of switching whether to communicate with the gas chambers 70 and 72 on both sides of the land portion 62 in cooperation with the land portion 62. Since this function is similar to the function of the switching valve that switches the state of the gas flow, the function of cooperation between the communication switching groove 82 and the land portion 62 can be called the function of the communication switching valve.

  The operation of the above configuration in various states of the vehicle will be described in detail with reference to FIGS. 4 to 6 show the sleeves when the vehicle is in a neutral state, FIGS. 7 to 9 show the case where the vehicle is displaced in the + X direction, and FIGS. 10 to 12 show the case where the vehicle is displaced in the −X direction. It is a figure which shows the state of a spool mechanism, the figure which shows the state of the gas pressure in a piston and cylinder mechanism, and the figure which shows the operating point of a vehicle body support apparatus. FIG. 13 is a diagram illustrating the relationship between the opening area of the control switching valve and the communication switching valve and the amount of displacement. In the following description, it is assumed that an exhaust throttle 58 is connected to the exhaust opening 56 of the communication cut-off valve 82, and communication is performed with a communicating air pressure of a gas pressure higher than atmospheric pressure.

First, a case where the vehicle is in a neutral state will be described. FIG. 4 is a view schematically showing the sleeve / spool mechanism described in FIG. 4 (a) is the cooperation of the communication switching groove 82 and the land portion 62, i.e., a view showing the state of function of the communicating switching valve, the gas pressure of the part head side air chamber shown as C _H P _H in part of the functionality of whether the switching valve the first air chamber 70 communicates with the portion shown as C _R of whether to communicate a second gas chamber 72 having a gas pressure P _R of the rod-side air chamber This is the function part of the switching valve. Similarly, FIG. 4 (b), the control switching groove 80 cooperates with the land portion 62, i.e., a view showing the state of function of the control switch valve, gas portion of the head-side gas chamber shown as S _H the first gas chamber 70 having a pressure P _H in the portion of the function of whether the switching valve is opened to the atmosphere, the atmosphere of the second gas chamber 72 portion shown as S _R has a gas pressure P _R of the rod-side air chamber It is a part of the function of the switching valve whether to open or not.

When the vehicle is in a neutral state, as described with reference to FIG. 3, the center position of the groove length of both the control switching groove 80 and the communication switching groove 82 is the center position in the axial direction of the land portion 62. Is set as follows. This arrangement relationship can be set when the vehicle body support device 40 is connected to the carriage unit 14 and the center pin 18. Therefore, in the vehicle is a neutral state, the C _H and C _R in the communication switch valve communicates with a high interconnected porosity body pressure than the atmospheric pressure by the exhaust throttle 58 is not opened to the atmosphere and S _H and S _R in the control switch valve It becomes a state.

FIG. 5 schematically shows the piston / cylinder mechanism, and is a diagram for explaining how the gas pressures in the head-side gas chamber 48 and the rod-side gas chamber 50 are changed using the results of FIG. Gas having a feed gas pressure P _S is a head side air chamber 48 via the head-side air inlet 52, are respectively supplied to the rod side air chamber 50 through the rod-side air inlet 54. Then, as described with reference to FIG. 4, if the head-side gas chamber 48 is opened to the atmospheric pressure by S _H of the control switch valve is switched, the rod-side air chamber 50 to the atmospheric pressure by S _R of the control switch valve Whether to open or not is switched. The head-side gas chamber 48 whether to communicate by C _H in the communication switch valve is switched, the rod-side air chamber 50 is switched whether communicating by C _R of the communication switching valve. According to the result of FIG. 4, in FIG. 5, control S _H of the switching valve also S _R also not open to the atmosphere, and the C _H and C _R of the communication switching valve, a high interconnected porosity body pressure than the atmospheric pressure by the exhaust throttle 58 It is shown as a state communicating with.

  FIG. 6 is a diagram showing where the result of FIG. 5 is on the diagram showing the relationship between the lateral displacement of the vehicle and the thrust F generated by the piston / cylinder mechanism. FIG. FIG. 6 shows the displacement in the X direction of the piston rod 46 with the cylinder housing 42 as a reference, with the horizontal axis representing the lateral displacement of the vehicle, and the vertical axis representing the thrust F generated by the piston head 44. . The thrust F can be obtained based on the differential pressure that is the difference between the gas pressures of the gas chambers 48 and 50 on both sides of the piston head 44. The sign of the thrust F is the same as the sign of the X direction displacement, that is, the + X direction. As + F. In the neutral state, the X-direction displacement is zero. At this time, the rod-side gas chamber 48 and the head-side gas chamber 50 communicate with each other to have the same communicating body pressure, but the pressure receiving area of the piston head 44 is that the piston-side gas chamber 50 side has a rod pressure. It is wider than the side gas chamber 48 by the cross-sectional area of the piston rod 46. Accordingly, the thrust is offset by + ΔF in the neutral state. The characteristics of the exhaust throttle 58 can be determined such that the magnitude of this thrust ΔF is such that it does not affect the lateral movement of the vehicle body.

  7 to 9 show a state where the vehicle is displaced by a displacement amount exceeding δ in the + X direction. As described in connection with the control switching groove 80, δ is half the distance of (the axial length of the land portion 62−the groove length of the control switching groove 80). It is also a distance that is half the groove length minus the length of the land portion 62 in the axial direction. 7 corresponds to FIG. 4, FIG. 8 corresponds to FIG. 5, and FIG. 9 corresponds to FIG.

In FIG. 7 (a), the piston rod 46 is displaced in the + X direction and C _H of the communication switch valve is opened to the atmosphere via a throttle 58 exhaust C _R is not open to the atmosphere, eventually first It is shown that the gas chamber 70 and the second gas chamber 72 do not communicate with each other. In FIG. 7 (b), that the piston rod 46 is displaced in the + X direction and S _H of the control switch valve is opened to the atmosphere S _R have been shown to not be open to the atmosphere. In Figure 8, according to the result of FIG. 7, S _R of the control switch valve is not opened to the atmosphere, S _H is opened to the atmosphere, is shown as a state of not communicating the C _H and C _R of the communication switching valve.

From the results of the control switching valves S _H and S _R and the communication switching valves C _H and C _R in FIG. 8, the head side gas chamber 48 is opened to the atmosphere and becomes atmospheric pressure. because it is held in the feed gas pressure P _S, the differential pressure, the piston head 44 generates a thrust force in the -X direction. That is, in FIG. 9, the operating point of the vehicle body supporting device is greater than the lateral displacement X is + [delta], the thrust F is a state of the magnitude of -F which corresponds to the differential pressure between the feed gas pressure P _S and the atmospheric pressure Indicated. That is, in the case of a lateral displacement in the + X direction exceeding + δ, a thrust force that pulls back this can be generated.

  FIGS. 10 to 12 show a state where the vehicle is displaced by a displacement amount exceeding δ in the −X direction. 10 corresponds to FIG. 4 and FIG. 7, FIG. 11 corresponds to FIG. 5 and FIG. 8, and FIG. 12 corresponds to FIG. 6 and FIG.

In FIG. 10 (a), the the piston rod 46 is displaced in the -X direction, the C _R of the communication switch valve is opened to the atmosphere via a throttle 58 exhaust C _H is not open to the atmosphere, eventually the It is shown that the first gas chamber 70 and the second gas chamber 72 do not communicate with each other. In FIG. 10 (b), the by piston rod 46 is displaced in the -X direction and S _R of the control switch valve is opened to the atmosphere has been shown that S _H is not open to the atmosphere. In Figure 11, according to the result of FIG. 10, S _H of the control switch valve is not opened to the atmosphere, S _R is opened to the atmosphere, is shown as a state of not communicating the C _H and C _R of the communication switching valve.

From the results of the control switching valves S _H and S _R and the communication switching valves C _H and C _R in FIG. 11, the rod side gas chamber 50 is opened to the atmosphere and becomes atmospheric pressure. because it is held in the feed gas pressure P _S, the differential pressure, the piston head 44 generates a thrust force in the + X direction. That is, in FIG. 12, the operating point of the vehicle body supporting apparatus, lateral displacement X exceeds - [delta, thrust F as the state of the magnitude of the + F corresponding to the differential pressure between the feed gas pressure P _S and the atmospheric pressure Indicated. That is, in the case of a lateral displacement in the −X direction exceeding −δ, it is possible to generate a thrust that pulls back the displacement.

FIG. 13 shows how the opening areas of the control switching valves S _H and S _R and the communication switching valves C _H and C _R , that is, the width of the portion not blocked by the land portion 62 are changed by the lateral displacement. It is a figure explaining how to do. As shown in FIG. 13, S _R of the control switch valve is gradually widens its opening area when lateral displacement occurs in the -X direction beyond - [delta, S _H of the control switch valve is greater than + [delta] When the lateral displacement occurs in the + X direction, the opening area gradually increases. Also, C _R of the communication switching valve, + X direction in the lateral displacement occurs when the gradually opening area thereof is reduced, thus completely closed exceeds + [delta]. When the lateral displacement occurs in the −X direction, the opening area of the communication switching valve C _H gradually decreases, and when it exceeds −δ, it completely closes.

  As described above, in the vehicle body support device 40, when the lateral displacement of the vehicle is within ± δ, which is the range of the control switching distance, almost no thrust is pulled back, and the lateral displacement exceeding the control switching distance ± δ. In this case, it has an action of generating a thrust to pull back the lateral displacement.

1 is a configuration diagram of a vehicle to which a vehicle body support device according to an embodiment of the present invention is applied. In embodiment concerning this invention, it is front sectional drawing of a vehicle body support apparatus, and plane sectional drawing. It is the expanded plane sectional view which expanded a part of Drawing 2 (a). In embodiment which concerns on this invention, it is a figure which shows the state of a sleeve spool mechanism about the case where a vehicle is in a neutral state. In embodiment which concerns on this invention, it is a figure which shows the state of the gas pressure in a piston and cylinder mechanism about the case where a vehicle is in a neutral state. In embodiment which concerns on this invention, it is a figure which shows the operating point of a vehicle body support apparatus about the case where a vehicle is in a neutral state. In embodiment which concerns on this invention, it is a figure which shows the state of a sleeve spool mechanism about the case where a vehicle is displaced to + X direction. In embodiment which concerns on this invention, it is a figure which shows the state of the gas pressure in a piston and cylinder mechanism about the case where a vehicle is displaced to + X direction. In embodiment which concerns on this invention, it is a figure which shows the operating point of a vehicle body support apparatus about the case where a vehicle is displaced to + X direction. In embodiment which concerns on this invention, it is a figure which shows the state of a sleeve spool mechanism about the case where a vehicle displaces to -X direction. In embodiment which concerns on this invention, it is a figure which shows the state of the gas pressure in a piston and cylinder mechanism about the case where a vehicle displaces to -X direction. In embodiment which concerns on this invention, it is a figure which shows the operating point of a vehicle body support apparatus about the case where a vehicle is displaced to -X direction. In embodiment which concerns on this invention, it is a figure explaining the relationship between the opening area and displacement amount of a control switching valve and a communication switching valve.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Vehicle, 12 Car body part, 14 Carriage part, 16 Air spring, 18 Center pin, 20 Wheel, 22 Coil spring, 24 Rail, 26 Damper, 28 Stopper rubber, 40 Car body support apparatus, 42 Cylinder housing, 44 Piston head, 46 Piston rod, 48, 50, 70, 72 Gas chamber, 52 Head side air supply port, 54 Rod side air supply port, 56, 57 Exhaust opening, 58 Exhaust throttle, 60 Spool, 62 Land part, 64, 74 Connection port , 66 gas flow path, 80, 82 switching groove.

Claims (6)

A fluid pressure cylinder having a cylinder housing connected to either the vehicle body side or the trolley side of the vehicle, and a piston portion connected to the other side of the vehicle body side or the trolley side;
The piston portion of the fluid pressure cylinder is a sleeve, and has a spool that is fixed to the cylinder housing and that can move relatively within the sleeve, and fluid according to the moving direction of the spool relative to the sleeve that is generated when the vehicle moves laterally. A control switching valve for switching the expansion / contraction direction of the pressure cylinder;
A vehicle body support device comprising: The vehicle body support device according to claim 1,
Two gas chambers partitioned by the cylinder housing and the piston head of the piston portion are referred to as a head side gas chamber and a rod side gas chamber,
Control gas pressure is supplied to the head side gas chamber and the rod side gas chamber,
The control switching valve is based on the cooperation of the sleeve and spool.
When the lateral movement direction of the vehicle is from the rod side gas chamber to the head side gas chamber, the rod side gas chamber is opened to the atmosphere, the fluid pressure cylinder is extended in the direction of the rod side gas chamber,
The vehicle body characterized in that when the lateral movement direction of the vehicle is from the head side gas chamber to the rod side gas chamber, the head side gas chamber is opened to the atmosphere and the fluid pressure cylinder is extended in the direction of the head side gas chamber. Support device. The vehicle body support device according to claim 2,
When the relative positional relationship between the sleeve and the spool is in the neutral position, the control switching valve does not release both the rod side gas chamber and the head side gas chamber to the atmosphere, and the spool has a predetermined control switching distance from the neutral position to the sleeve. A vehicle body support device that opens the rod-side gas chamber or the head-side gas chamber to the atmosphere when moving. The vehicle body support device according to any one of claims 1, 2, and 3,
When the relative positional relationship between the sleeve and the spool is in the neutral position, the rod side gas chamber communicates with the head side gas chamber, and when the spool moves a predetermined communication switching distance from the neutral position with respect to the sleeve, the rod side gas A vehicle body support device having a communication switching valve for stopping communication between the chamber and the head side gas chamber. The vehicle body support device according to claim 4,
The vehicle body support device, wherein the communication switching groove provided in the sleeve for the communication switching valve is provided at a circumferential position different from the control switching groove provided in the sleeve for the control switching valve. The vehicle body support device according to claim 4,
The vehicle body support device, wherein the communication switching valve is opened to the atmosphere together with the communication.

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