JP2018052277A - Leveling valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leveling valve which can prevent inclination of a stem coupled to a piston.SOLUTION: A leveling valve 100 includes: a piston 20 which is stored in a storage hole 11 formed at a case 10 and axially moves in conjunction with rotation of a lever 4; a stem 50 coupled to one end part in an axial direction of the piston 20; a supply/discharge valve 80 which allows communication between an air spring 3 and a compressor 7 by the stem 50 moving from a neutral position in one direction and allows communication between the air spring 3 and an exhaust passage 8 by the stem 50 moving from the neutral position in the other direction; and a first guide part 41a which is provided at the case 10 and slidably supports the tip side of the stem 50.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a leveling valve.

  Patent Document 1 describes a leveling valve that keeps the position of a railway vehicle supported by the air spring by supplying compressed air to the air spring of the railway vehicle or discharging air from the air spring.

  In the leveling valve described in Patent Document 1, when the support height of the vehicle body by the air spring changes due to a change in the vehicle body load, this change causes the lever to swing through the link, and through the piston connected to the tip of the lever. The spool is driven in the axial direction. Depending on the driving of such a spool, either the first passage connected to the compressor as the air pressure supply source or the second passage connected to the drain is selected as the air spring passage connected to the air spring. Connected. Further, in this leveling valve, the flow rate characteristic is set by using the flow resistance of the annular gap formed between the large diameter portion formed at the tip of the spool and the reduced diameter portion of the spool hole.

JP2011-949A

  In the leveling valve described in Patent Document 1, the spool is cantilevered by the piston. For this reason, when the lever swings and a moment acts on the piston, the piston tilts. When the piston is inclined, the spool connected to the piston is inclined with the ring seal provided at the sliding contact portion of the spool hole as a fulcrum, and the flow rate characteristic may change.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a leveling valve capable of preventing the inclination of a stem connected to a piston.

  According to a first aspect of the present invention, an air spring provided between a carriage and a vehicle body is selectively used as a compressed air source or an exhaust passage in accordance with a rotation direction of a lever that rotates in accordance with a relative displacement of the vehicle body with respect to the carriage of the railway vehicle. A leveling valve that adjusts the height of an air spring by communicating with a piston that is housed in a housing hole formed in the housing and moves in the axial direction as the lever rotates, and one of the pistons in the axial direction of the piston. A stem connected to the end portion, and the air spring and the compressed air source communicate with each other by moving the stem from the neutral position in one direction; and the air spring and the exhaust passage by moving the stem from the neutral position in the other direction. And a first guide portion that is provided on the housing and slidably supports the distal end side of the stem.

  In the first invention, even if a moment acts on the piston due to the rotation of the lever, the first guide portion is slidably supported, so that the tilt of the stem connected to the piston and the piston can be prevented.

  According to a second aspect of the present invention, the housing further includes a second guide portion that is provided in the housing at a distance from the first guide portion and that slidably supports the proximal end side of the stem.

  In the second invention, since the stem is supported by the first guide part and the second guide part provided at a distance from the first guide part, compared with the case where the stem is supported only by the first guide part. It is possible to reliably prevent the piston and the stem 50 connected to the piston from being inclined.

  According to a third aspect of the present invention, an annular gap is formed between the outer periphery of the stem and the housing to restrict the flow of compressed air that accompanies opening and closing of the supply / exhaust valve, and the annular gap is defined between the first guide portion and the second guide portion. It is provided between them.

  In 3rd invention, the flow of the compressed air supplied / exhausted to an air spring can be restrict | limited by the annular clearance. As a result, it is possible to prevent the height of the air spring from following small changes in the height of the vehicle body, and to prevent the ride comfort from deteriorating. Furthermore, by providing the annular gap between the first guide part and the second guide part, it is possible to reliably prevent the annular gap from being inclined and the flow rate characteristic from changing.

  According to a fourth aspect of the invention, the piston is supported by the stem so as to be movable in the housing, and a gap is provided between the outer peripheral surface of the piston and the inner peripheral surface of the housing hole of the housing.

  In the fourth invention, since the piston does not contact the housing hole, the sliding resistance between the piston and the housing can be reduced. This improves the responsiveness of the leveling valve. Further, since the piston does not contact the housing receiving hole, the piston and the housing are not worn. Thereby, durability of a piston and a housing improves.

  ADVANTAGE OF THE INVENTION According to this invention, the leveling valve which can prevent the inclination of the stem connected with the piston can be provided.

FIG. 1 is a mounting diagram of a leveling valve according to an embodiment of the present invention. FIG. 2 is a sectional view in the axial direction of the leveling valve according to the embodiment of the present invention. FIG. 3 is a radial sectional view of the leveling valve according to the embodiment of the present invention. FIG. 4 is an enlarged view of the vicinity of the first guide portion and the annular gap in the leveling valve according to the embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  A leveling valve 100 according to an embodiment of the present invention will be described. First, an outline of the leveling valve 100 will be described with reference to FIGS. 1 and 2.

  The leveling valve 100 has a function of adjusting the height of an air spring provided between the vehicle body and the carriage of the railway vehicle to maintain the vehicle body at a constant height.

  As shown in FIG. 1, the leveling valve 100 is mounted between the vehicle body 1 and the carriage 2. Specifically, the leveling valve 100 is attached to the vehicle body 1 and connected to the carriage 2 via the lever 4 and the connecting rod 5. When the air spring 3 expands and contracts due to a load change of the vehicle body 1 and the height of the vehicle body 1 changes, this change is transmitted to the leveling valve 100 via the connecting rod 5 and the lever 4.

  When the vehicle body load increases and the air spring 3 bends, the lever 4 is pushed upward from the neutral position (rotation in the direction of arrow A in FIG. 1), and accordingly, the piston 20 (see FIG. 2), an air supply valve 80A, which will be described later, is opened, and an air spring passage 6 communicating with the air spring 3 and a supply passage 9 communicating with a compressor 7 serving as a compressed air source communicate with each other. Thereby, the compressed air from the compressor 7 is supplied to the air spring 3. When the air spring 3 is restored to a certain height, the lever 4 returns to the neutral position, the supply valve 80A of the leveling valve 100 is closed, and the supply of compressed air is shut off.

  On the other hand, when the vehicle body load decreases and the air spring 3 extends, the lever 4 is pulled downward from the neutral position (rotation in the direction of arrow B in FIG. 1), and the exhaust of the leveling valve 100, which will be described later, accordingly. The valve 80B is opened, and the air spring passage 6 and the exhaust passage 8 communicate with each other. Since the exhaust passage 8 communicates with the atmosphere, the compressed air of the air spring 3 is discharged to the atmosphere. When the air spring 3 is restored to a certain height, the lever 4 returns to the neutral position, the exhaust valve 80B of the leveling valve 100 is closed, and the discharge of compressed air is shut off.

  As described above, the leveling valve 100 selectively communicates the air spring 3 with the compressor 7 or the exhaust passage 8 according to the rotation direction of the lever 4 that rotates according to the relative displacement of the vehicle body 1 with respect to the carriage 2. The relative displacement generated between the vehicle 1 and the carriage 2 is automatically adjusted to maintain the vehicle body 1 at a constant height.

  Next, a specific configuration of the leveling valve 100 will be described with reference to FIGS. 2 and 3. FIG. 2 is a sectional view in the axial direction of the leveling valve 100, and FIG. 3 is a sectional view in the radial direction of the leveling valve 100.

  The leveling valve 100 includes a case 10 having an accommodation hole 11 fixed to the vehicle body 1 and penetrating through the inside, and a first cap attached to one side surface of the case 10 and closing one opening of the accommodation hole 11. A member 12, a second cap member 13 attached to the other side surface of the case 10, and a cylindrical valve case 40 that closes the other opening of the accommodation hole 11 are provided.

  The first cap member 12 includes a columnar insertion portion 12a that is inserted into the receiving hole 11, and a flange portion 12b that is formed continuously with the insertion portion 12a and has a larger diameter than the insertion portion 12a. The first cap member 12 is attached to the case 10 by inserting a bolt (not shown) through a through hole (not shown) provided in the flange portion 12 b and fastening it to a bolt hole formed in the case 10.

  A male screw portion 40 b is formed on a part of the outer peripheral surface of the valve case 40. The valve case 40 includes a first cylindrical portion 40a and a second cylindrical portion 40c with the external thread portion 40b as a boundary. The first cylindrical portion 40 a and the male screw portion 40 b are inserted into the accommodation hole 11. The male screw portion 40b is formed in the vicinity of the opening of the accommodation hole 11, and is therefore screwed into the screw portion 11a. Thereby, the valve case 40 is fixed to the case 10.

  The second cap member 13 is fixed to the case 10 so as to cover the outer peripheral surface of the second cylindrical portion 40c of the valve case 40 and to cover the side surface of the male screw portion 40b on the second cylindrical portion 40c side. This reliably prevents the valve case 40 from coming off the case 10. In the second cap member 13, a flow path 13 a that connects the flow path 10 b formed in the case 10 and a through hole 46 that connects the inside and the outside of the valve case 40 is formed.

  As shown in FIG. 3, the case 10 is formed with a recess 16 that opens in the radial direction with respect to the accommodation hole 11. The recess 16 is formed so as to be connected to the accommodation hole 11.

  The leveling valve 100 further includes a cover member 70 that covers the recess 16 and is attached to the case 10. By attaching the cover member 70 to the case 10, an accommodation space 17 for accommodating the rotor 30 described later is formed.

  The cover member 70 is formed with a communication hole 72 that allows the accommodation space 17 to communicate with the outside. The communication hole 72 is provided with a filter 73 for preventing foreign matter from entering from the outside.

  In the leveling valve 100, the housing 90 is configured by the case 10, the first cap member 12, the second cap member 13, the cover member 70, and the valve case 40.

  As shown in FIGS. 2 and 3, the leveling valve 100 is housed in the housing hole 11 of the case 10 and moves in the axial direction as the lever 4 rotates, and the rotation of the lever 4 is transmitted to the piston 20. And the stem 50 connected to one end (end face) in the axial direction of the piston 20, and the air spring 3 and the compressor 7 are communicated by moving the stem 50 in one direction from the neutral position. And a supply / discharge valve 80 that causes the air spring 3 and the exhaust passage 8 to communicate with each other when the stem 50 moves in the other direction from the neutral position.

  The piston 20 is movably supported by the stem 50 in the accommodation hole 11 of the case 10. A gap is provided between the outer peripheral surface of the piston 20 and the inner peripheral surface of the accommodation hole 11. Thereby, since the outer peripheral surface of the piston 20 does not slide on the inner peripheral surface of the accommodation hole 11, sliding resistance does not occur. A specific configuration in which the piston 20 is supported by the stem 50 will be described later. As shown in FIG. 3, a groove 21 having a half-moon shape in cross section is formed on a part of the outer peripheral surface of the piston 20.

  As shown in FIG. 3, the rotor 30 is rotatably supported by support holes 71 formed in the cover member 70 via bearings 14 and 15. The rotor 30 is formed so as to protrude from a cylindrical main body 31 supported by the bearings 14 and 15 and one end of the main body 31, and has a two-surface width smaller than the outer diameter of the main body 31. A quadrangular columnar boss part 32, a flange part 33 provided at the other end of the main body part 31, an arm part 34 formed so as to protrude radially outward from the outer peripheral surface of the flange part 33, Have The boss portion 32 is fitted into a fitting hole 4a formed in the lever 4 (see FIG. 1). As shown in FIGS. 2 and 3, a pin 35 is press-fitted into the arm portion 34. The pin 35 is inserted into the sleeve 36 and is movably inserted into the groove 21 of the piston 20 together with the sleeve 36. As a result, when the boss portion 32 rotates with the rotation of the lever 4, the pin 35 press-fitted into the arm portion 34 rotates in the direction of the arrow shown in FIG. Since the pin 35 is inserted into the groove 21 of the piston 20, the piston 20 moves in the housing hole 11 in the axial direction as the pin 35 rotates.

  As shown in FIG. 2, the stem 50 is formed in a bottomed cylindrical shape extending in the moving direction of the piston 20 (the axial direction of the accommodation hole 11). The stem 50 is provided with an axial hole 51 in the axial direction. On the proximal end side (bottom side) of the stem 50, a plurality of through holes 52 that communicate the axial hole 51 and the accommodation hole 11 are provided in the radial direction. The axial hole 51 communicates with the outside through the through hole 52, the accommodation hole 11, the accommodation space 17, and the communication hole 72. The exhaust passage 8 is configured by the axial hole 51, the through hole 52, the accommodation hole 11, the accommodation space 17, and the communication hole 72.

  The stem 50 includes a first land portion 50a, a second land portion 50b, and a third land portion 50c in order from the base end side. A first annular groove 54a is formed between the first land portion 50a and the second land portion 50b, and a second annular groove 54b is formed between the second land portion 50b and the third land portion 50c. A valve portion 53 constituting the exhaust valve 80B is formed on the distal end side of the stem 50, specifically, on the end surface of the third land portion 50c. The valve unit 53 will be described later.

  Next, the internal structure of the valve case 40 will be described with reference to FIGS.

  The valve case 40 is formed with a through hole 40d that penetrates the valve case 40 in the axial direction. The through hole 40d has a small-diameter portion 41 that opens to the end surface on the piston 20 side and is inserted into the distal end side of the stem 50; And a step portion 43 that forms a boundary between the small diameter portion 41 and the large diameter portion 42.

  An O-ring 44 that seals between the inner peripheral surface of the small diameter portion 41 and the outer peripheral surface of the stem 50 is provided in the vicinity of the distal end portion of the small diameter portion 41 on the piston 20 side.

  The small-diameter portion 41 is slidably supported by the first land portion 50c of the stem 50, and the first guide portion 41a is spaced from the first guide portion 41a and slides on the first land portion 50a of the stem 50. And a second guide part 41b that is freely supported. A gap forming portion 41c is provided between the first guide portion 41a and the second guide portion 41b in the small diameter portion 41. A minute annular gap (hereinafter referred to as “annular gap S”) is provided between the gap forming portion 41 c and the outer peripheral surface of the second land portion 50 b. Furthermore, an annular groove 41d is provided between the first guide part 41a and the gap forming part 41c, and an annular groove 41e is provided between the gap forming part 41c and the second guide part 41b. An annular space 47 is formed by the outer peripheral surface of the groove 41 d and the stem 50, and an annular space 48 is formed by the outer peripheral surface of the groove 41 e and the stem 50.

  A cylindrical collar member 86 having an internal space 86 a and a plug 84 that closes the opening of the large diameter portion 42 are provided in the large diameter portion 42. The plug 84 is locked by a retaining ring 87 engaged in the large diameter portion 42 so as to press the collar member 86 against the stepped portion 43.

  The stepped portion 43 is provided with an annular valve seat portion 43a that functions as a valve seat of an air supply valve 80A described later so as to protrude in the axial direction. Further, the stepped portion 43 is provided with a communication passage 49 having one end opened to the stepped portion 43 and the other end opened to the space 47 on the radially inner side of the valve seat portion 43 a. The communication passage 49 is formed so as to penetrate the space 47 and the space 88 on the inner peripheral side of the valve seat portion 43a, and always communicates the space 47 and the space 88. In the leveling valve 100, the space 88, the communication passage 49, the space 47, the annular gap S, the space 48, the through hole 45 formed in the valve case 40, the passage 10a formed in the case 10, the inner peripheral surface of the case 10 and the The air spring passage 6 is configured by the annular flow passage 10c formed between the insertion portion 12a of the one cap member 12 and the through flow passage 10d formed in the case 10 and connected to the annular flow passage 10c.

  In the internal space 86 a of the collar member 86, a valve body 82 that is separated from and seated on the valve seat portion 43 a, a spring 83 that biases the valve body 82 toward the valve seat portion 43 a, and a valve seat portion formed on the plug 84. And a check valve body 85 that is detachably seated on 84 a and is urged against the valve seat portion 84 a by a spring 83.

  As shown in FIG. 2, a flow path 84 b is formed inside the plug 84. The flow path 84 b communicates with the compressor 7 through the through hole 46 of the valve case 40, the flow path 13 a of the second cap member 13, and the flow path 10 b of the case 10.

  The check valve body 85 is separated from and seated on the valve seat portion 84 a of the plug 84. When the pressure on the compressor 7 side (flow path 84 b) is higher than the pressure on the downstream side (internal space 86 a) of the check valve body 85, the check valve body 85 resists the urging force of the spring 83 from the valve seat portion 84 a. Separate. Conversely, when the pressure on the compressor 7 side (flow path 84b) is lower than the pressure on the downstream side (internal space 86a) of the check valve body 85, the check valve body 85 is seated on the valve seat portion 84a. In the leveling valve 100, the supply passage 9 is configured by the internal space 86a, the flow path 84b, the through hole 46, the flow path 13a, and the flow path 10b.

  The valve case 40 includes a supply / discharge valve 80 therein. The supply / discharge valve 80 includes an air supply valve 80A that controls communication or blocking between the supply passage 9 and the air spring passage 6, and an exhaust valve 80B that controls communication or blocking between the air spring passage 6 and the exhaust passage 8. Provide (see FIG. 4). Hereinafter, the air supply valve 80A and the exhaust valve 80B will be described in detail with reference to FIG.

  The valve body 82 has a seat portion 82a having elasticity. The seat portion 82 a is separated from and seated on the valve seat portion 43 a of the step portion 43. When the seat portion 82a of the valve body 82 is seated on the valve seat portion 43a of the stepped portion 43, the communication between the supply passage 9 and the air spring passage 6, specifically, the communication between the internal space 86a and the space 88 is blocked. Is done. On the other hand, when the seat portion 82a of the valve body 82 is separated from the valve seat portion 43a of the stepped portion 43, the supply passage 9 and the air spring passage 6, specifically, the internal space 86a and the space 88 communicate with each other. To do. Thus, the air supply valve 80 </ b> A for controlling the air supply to the air spring 3 is configured by the seat portion 82 a of the valve body 82 and the valve seat portion 43 a of the step portion 43.

  The valve portion 53 of the stem 50 is seated and seated on the seat portion 82a of the valve body 82. When the valve portion 53 of the stem 50 is seated on the seat portion 82 a of the valve body 82, the communication between the air spring passage 6 and the exhaust passage 8, specifically, the communication between the space 88 and the axial hole 51 is blocked. The In contrast, when the valve portion 53 of the stem 50 is separated from the seat portion 82a of the valve body 82, the air spring passage 6 and the exhaust passage 8, more specifically, the space 88 and the axial hole 51 communicate with each other. To do. As described above, the valve portion 53 of the stem 50 and the seat portion 82a of the valve body 82 constitute an exhaust valve 80B that controls the exhaust from the air spring 3.

  The operation of the leveling valve 100 configured as described above will be described.

  As described above, when the vehicle body load increases and the air spring 3 bends, the lever 4 is pushed upward from the neutral position (rotation in the direction of arrow A in FIG. 1). Accordingly, the rotor 30 connected to the lever 4 rotates rightward in FIG. 2, so that the pin 35 provided on the arm portion 34 of the rotor 30 rotates rightward around the main body portion 31. The pin 35 rotates rightward while moving downward in the groove 21 of the piston 20 in FIG. As a result, the piston 20 moves to the right in FIG. Accordingly, the stem 50 connected to the piston 20 pushes the valve element 82 against the urging force of the spring 83 to separate it from the valve seat 43a. Thereby, the supply passage 9 and the air spring passage 6 communicate with each other. Specifically, the compressed air discharged from the compressor 7 flows into the flow path 10b, the flow path 13a, the through hole 46, the flow path 84b, the internal space 86a, the space 88, the communication path 49, the space 47, the annular gap S, the space. 48, the through hole 45, the passage 10a, the annular flow path 10c, and the through flow path 10d are supplied to the air spring 3.

  At this time, since the valve portion 53 of the stem 50 is pressed by the seat portion 82a of the valve body 82, the axial hole 51 and the space 88 are maintained in a blocked state. That is, when the piston 20 moves to the right from the neutral position, the air supply valve 80A is opened and the supply passage 9 and the air spring passage 6 are communicated, and the exhaust valve 80B is closed and the exhaust passage 8 and The air spring passage 6 is cut off.

  When the supply passage 9 and the air spring passage 6 communicate with each other, the compressed air from the compressor 7 is supplied to the air spring 3 through the supply passage 9 and the air spring passage 6, and the height of the air spring 3 is increased. Therefore, the height of the vehicle body 1 increases, and the lever 4 approaches the neutral position accordingly. As the lever 4 approaches the neutral position, the piston 20 and the stem 50 also move leftward in FIG. Eventually, when the height of the vehicle body 1 returns to the specified position, the lever 4 returns to the neutral position, and the seat portion 82a of the valve element 82 is seated on the valve seat portion 43a. That is, the air supply valve 80A of the leveling valve 100 is closed. Thereby, the communication between the supply passage 9 and the air spring passage 6 is cut off, and the supply of compressed air to the air spring 3 is cut off.

  On the other hand, when the vehicle body load decreases and the air spring 3 extends, the lever 4 is pushed downward from the neutral position (rotation in the direction of arrow B in FIG. 1). Accordingly, the rotor 30 connected to the lever 4 rotates leftward in FIG. 2, so that the pin 35 provided on the arm portion 34 of the rotor 30 rotates leftward about the main body portion 31. The pin 35 rotates leftward while moving downward in the groove 21 of the piston 20 in FIG. As a result, the piston 20 moves to the left in FIG. The stem 50 moves in the left direction together with the piston 20. Accordingly, the valve portion 53 of the stem 50 is separated from the seat portion 82a of the valve body 82. As a result, the air spring passage 6 and the exhaust passage 8 communicate with each other. Specifically, the compressed air in the air spring 3 is divided into the through flow passage 10d, the annular flow passage 10c, the passage 10a, the through hole 45, the space 48, the annular gap S, the space 47, the communication passage 49, the space 88, and the axial direction. The holes 51, the through holes 52, the accommodation holes 11, the accommodation spaces 17, and the communication holes 72 are discharged to the atmosphere.

  At this time, since the seat portion 82a of the valve body 82 is pressed against the valve seat portion 43a by the urging force of the spring 83, the internal space 86a and the space 88 of the collar member 86 are blocked. That is, when the piston 20 moves leftward from the neutral position, the exhaust valve 80B is opened, the air spring passage 6 and the exhaust passage 8 are communicated, and the air supply valve 80A is closed, and the supply passage 9 and The air spring passage 6 is cut off.

  When the air spring passage 6 and the exhaust passage 8 communicate with each other, the compressed air from the air spring 3 is released to the atmosphere through the air spring passage 6 and the exhaust passage 8, and the height of the air spring 3 is lowered. Therefore, the height of the vehicle body 1 is lowered, and the lever 4 is also brought closer to the neutral position accordingly. As the lever 4 approaches the neutral position, the piston 20 and the stem 50 also move in the right direction in FIG. Eventually, when the height of the vehicle body 1 returns to the specified position, the lever 4 returns to the neutral position, and the valve portion 53 of the stem 50 is seated on the seat portion 82a of the valve body 82. That is, the exhaust valve 80B of the leveling valve 100 is closed. Thereby, the communication between the air spring passage 6 and the exhaust passage 8 is cut off, and the exhaust of compressed air from the air spring 3 is cut off.

  In this way, the leveling valve 100 selectively communicates the air spring 3 with the compressor 7 or the atmosphere according to the rotation direction of the lever 4 that rotates according to the relative displacement of the vehicle body 1 with respect to the carriage 2. Adjust the height.

  Next, the function of the annular gap S will be described.

  For example, when a railway vehicle is traveling, the height of the vehicle body 1 changes in small increments due to vibrations or the like. Accordingly, when the height of the air spring 3 changes in small increments, the riding comfort is deteriorated. For this reason, in the leveling valve 100, an annular gap S is provided. Thereby, when the amount of change in the height of the vehicle body 1 is small, that is, when the amount of change in the stem 50 is small, the annular gap S exists even if the intake valve 80A or the exhaust valve 80B is opened. The flow rate supplied to 6 or the flow rate discharged from the air spring passage 6 is limited. As a result, the height of the air spring 3 is prevented from following small changes in the height of the vehicle body 1. Thereby, it can prevent that riding comfort deteriorates. Even when the annular gap S is provided, the annular gap S disappears when the stem 50 moves to a position where the second land portion 50b and the gap forming portion 41c are displaced in the axial direction, and a large flow rate of compressed air can be flowed.

  Next, functions of the first guide part 41a and the second guide part 41b will be described.

  In the leveling valve 100, the rotational motion of the arm portion 34 (pin 35) of the rotor 30 connected to the lever 4 is converted into the linear motion of the piston 20. As shown in FIG. 2, the pin 35 press-fitted into the arm portion 34 is displaced from the central axes of the piston 20 and the stem 50. Even if the pin 35 is positioned on the central axis of the piston 20 and the stem 50 when the lever 4 is neutral, the pin 35 rotates about the main body 31 of the rotor 30, so The force acting on the center of the piston 20 and the stem 50 deviates from the central axis. For this reason, a moment acts on the piston 20 and the stem 50 from the pin 35 as the lever 4 rotates. When the moment acts, the stem 50 may tilt with the O-ring 44 provided in the valve case 40 as a fulcrum. If the stem 50 is tilted, the cross-sectional area of the annular gap S may change and the flow characteristics may change, or the sealing performance of the valve portion 53 may be impaired.

  Therefore, the leveling valve 100 includes a first guide portion 41a that slidably supports the third land portion 50c of the stem 50, and a second guide portion 41b that slidably supports the first land portion 50a of the stem 50. And are provided. Since the stem 50 is slidably supported by the first guide portion 41a and the second guide portion 41b, even if a moment acts on the piston 20 as the lever 4 rotates, The inclination of the connected stem 50 can be prevented.

  Further, in the leveling valve 100, since the annular gap S is provided between the first guide portion 41a and the second guide portion 41b, it is possible to reliably prevent the annular gap S from being inclined and the flow rate characteristics from being changed. Furthermore, by providing the first guide portion 41a closer to the distal end side of the stem 50 than the annular gap S, the annular gap S can be prevented from coming into contact with the inner peripheral surface of the through hole 40d and being worn. If the tilt of the piston 20 and the stem 50 can be prevented only by the first guide portion 41a, the second guide portion 41b may not be provided.

  According to the above embodiment, there exist the following effects.

  The leveling valve 100 includes a first guide portion 41a that slidably supports the third land portion 50c of the stem 50, and a second guide portion 41b that slidably supports the first land portion 50a of the stem 50. Prepare. Thus, even if a moment acts on the piston 20 due to the rotation of the lever 4, the first guide portion 41a and the second guide portion 41b are slidably supported by the first guide portion 41a and the stem 50 connected to the piston 20. Is prevented from tilting. Therefore, it is possible to prevent the flow rate characteristic from changing due to the change in the cross-sectional area of the annular gap S. Moreover, it can prevent that the sealing performance of the valve part 53 is impaired by inclining the stem 50. FIG.

  Further, the stem 50 is supported by the first guide portion 41a and the second guide portion 41b that is spaced apart from the first guide portion 41a, so that the first guide portion 41a alone is supported. Thus, the tilt of the piston 20 and the stem 50 connected to the piston 20 can be reliably prevented.

  Further, in the leveling valve 100, since the annular gap S is provided between the first guide part 41a and the second guide part 41b, it is possible to reliably prevent the annular gap S from being inclined and the flow rate characteristic from being changed.

  Further, in a leveling valve that does not include the conventional first guide portion 41 a and second guide portion 41 b, the inclination of the stem 50 is suppressed by sliding the piston 20 into the accommodation hole 11. On the other hand, in the leveling valve 100 of the present embodiment, the piston 20 is supported by the first guide portion 41a and the second guide portion 41b, and between the outer peripheral surface of the piston 20 and the inner peripheral surface of the accommodation hole 11. Is provided with a gap. In other words, the inclination of the stem 50 can be suppressed by the first guide portion 41a and the second guide portion 41b without sliding the piston 20 into the accommodation hole 11. Thus, in the leveling valve 100, since the piston 20 does not contact the accommodation hole 11, the sliding resistance by the piston 20 can be reduced, and the responsiveness is improved. Furthermore, since the piston 20 does not contact the accommodation hole 11, the piston 20 and the accommodation hole 11 are not worn. Thereby, durability of piston 20 and case 10 improves.

  The configuration, operation, and effect of the embodiment of the present invention configured as described above will be described together.

  The leveling valve 100 is housed in a housing hole 11 formed in the housing 90 and moves in the axial direction as the lever 4 rotates, and a stem connected to one end of the piston 20 in the axial direction. 50 and the stem 50 are moved in one direction from the neutral position to allow the air spring 3 and the compressed air source (compressor 7) to communicate with each other, and the stem 50 is moved in the other direction from the neutral position to the air spring 3 and the exhaust. A supply / exhaust valve 80 that communicates with the passage 8 and a first guide portion 41 a that is provided in the housing 90 and slidably supports the distal end side of the stem 50 are provided.

  In this configuration, even if a moment is applied to the piston 20 due to the rotation of the lever 4, the first guide portion 41a is slidably supported, so that the tilt of the piston 20 and the stem 50 connected to the piston 20 can be prevented. .

  The leveling valve 100 further includes a second guide portion 41b that is provided in the housing 90 at a distance from the first guide portion 41a and that slidably supports the proximal end side of the stem 50.

  In this configuration, since the stem 50 is supported by the first guide portion 41a and the second guide portion 41b provided at a distance from the first guide portion 41a, the first guide portion 41a only supports the stem 50. In comparison, the tilt of the piston 20 and the stem 50 connected to the piston 20 can be reliably prevented.

  Further, in the leveling valve 100, an annular gap S is formed between the outer periphery of the stem 50 and the housing 90 to restrict the flow of compressed air that accompanies opening and closing of the supply / discharge valve 80. The annular gap S is formed by the first guide portion 41a. And the second guide portion 41b.

  In this configuration, the flow of compressed air supplied to and discharged from the air spring 3 by the annular gap S can be limited. Thereby, it can prevent that the height of the air spring 3 follows the small change of the height of the vehicle body 1, and it can prevent that riding comfort deteriorates. Furthermore, by providing the annular gap S between the first guide part 41a and the second guide part 41b, it is possible to reliably prevent the annular gap S from being inclined and the flow rate characteristic from changing.

  In the leveling valve 100, the piston 20 is supported by the stem 50 so as to be movable in the housing 90, and a gap is provided between the outer peripheral surface of the piston 20 and the inner peripheral surface of the housing hole 11 of the housing 90.

  In this configuration, since the piston 20 does not contact the housing hole 11 of the housing 90, the sliding resistance between the piston 20 and the housing 90 can be reduced. Thereby, the responsiveness of the leveling valve 100 improves. Further, since the piston 20 does not contact the housing hole 11 of the housing 90, the piston 20 and the housing 90 are not worn. Thereby, durability of piston 20 and housing 90 improves.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  The second cap member 13 and the valve case 40 may be integrally formed, and the case 10 and the valve case 40 may be integrally formed.

  The piston 20 may be configured to slide in the accommodation hole 11. In this case, the inclination of the piston 20 can be prevented by the piston 20 itself.

  In the leveling valve 100, the communication path 49 is shown as an example of a structure formed by a through hole. However, the communication path 49 is a groove extending in the axial direction on the inner peripheral surface of the first guide portion 41a or the third land portion. You may form in the outer peripheral surface by the groove | channel extended in an axial direction.

DESCRIPTION OF SYMBOLS 100 ... Leveling valve, 1 ... Vehicle body, 2 ... Cart, 3 ... Air spring, 4 ... Lever, 6 ... Air spring passage, 7 ... Compressor (compressed air source) , 8 ... exhaust passage, 9 ... supply passage, 10 ... case (housing), 11 ... receiving hole, 12 ... first cap member (housing), 13 ... second cap Member (housing), 20 ... piston, 40 ... valve case (housing), 41a ... first guide part, 41b ... second guide part, 43a ... valve seat, 50 ... Stem, 53 ... valve portion, 60 ... guide rod, 80 ... supply / discharge valve, 80A ... supply valve, 80B ... exhaust valve, 82 ... valve body, 82a ... Seat part, 90 ... housing, S ... annular gap

Claims (4)

An air spring provided between the carriage and the vehicle body is selectively communicated with a compressed air source or an exhaust passage according to a rotation direction of a lever that rotates in accordance with a relative displacement of the vehicle body with respect to the carriage of the railway vehicle. A leveling valve for adjusting the height of the air spring,
A piston housed in a housing hole formed in the housing and moving in the axial direction as the lever rotates;
A stem connected to one end of the piston in the axial direction;
The air spring communicates with the compressed air source when the stem moves in one direction from the neutral position, and the air spring communicates with the exhaust passage when the stem moves in the other direction from the neutral position. A supply and discharge valve;
A first guide portion provided in the housing and slidably supporting a distal end side of the stem;
A leveling valve characterized by comprising:   2. The leveling valve according to claim 1, further comprising a second guide portion that is provided at a distance from the first guide portion in the housing and slidably supports a proximal end side of the stem. An annular gap is formed between the outer periphery of the stem and the housing to restrict the flow of compressed air that accompanies opening and closing of the supply / discharge valve,
The leveling valve according to claim 2, wherein the annular gap is provided between the first guide portion and the second guide portion.   3. The piston is supported by the stem so as to be movable in the housing, and a gap is provided between an outer peripheral surface of the piston and an inner peripheral surface of the housing hole of the housing. Or the leveling valve of 3.

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