JP7221388B2 - Differential pressure valve - Google Patents

Description

The present invention relates to differential pressure valves.
This application claims priority based on Japanese Patent Application No. 2019-118690 filed in Japan on June 26, 2019, the content of which is incorporated herein.

A railway vehicle is provided with a differential pressure valve that opens and closes the communication path according to the pressure difference between the two air springs provided between the car body and the bogie (for example, See Patent Documents 1 and 2).

Japanese Patent Application Laid-Open No. 2002-120723 JP 2012-202520 A

A differential pressure valve is required to suppress variations in valve opening pressure.

The present invention provides a differential pressure valve capable of suppressing variations in valve opening pressure.

According to the first aspect of the present invention, the differential pressure valve is formed in a valve chamber, a circular valve body provided in the valve chamber, and a bottom portion of the valve chamber. an outflow port formed in the inner peripheral surface of the valve chamber for discharging air to the other air spring; and the valve body formed in the bottom of the valve chamber so as to surround the inflow port. It has a seat portion on which the valve is seated, and a biasing member that biases the valve body toward the seat portion in a valve closing direction. The valve body includes a first collar portion extending radially outward from the seat portion on the bottom portion side. The first flange portion includes a plurality of first protrusions that protrude radially outward toward the inner peripheral surface of the valve chamber, and a plurality of first protrusions that protrude radially inward at positions opposite to the first protrusions in the circumferential direction. and a recessed first recess.

According to the second aspect of the present invention, the differential pressure valve is formed in a valve chamber, a circular valve body provided in the valve chamber, and the bottom of the valve chamber, and the air from one of the air springs flows into the valve chamber. an outflow port formed in the inner peripheral surface of the valve chamber for discharging air to the other air spring; and the valve body formed in the bottom of the valve chamber so as to surround the inflow port. It has a seat portion on which the valve is seated, and a biasing member that biases the valve body toward the seat portion in a valve closing direction. The valve body has a first brim portion extending radially outward from the seat portion on the side of the bottom portion. An outwardly extending second collar is provided. The first flange portion has a plurality of first protrusions protruding radially outward toward the inner peripheral surface of the valve chamber. The second brim has a plurality of second protrusions protruding radially outward toward the inner peripheral surface of the valve chamber at positions circumferentially displaced from the first protrusions.

According to the differential pressure valve described above, it is possible to suppress variations in valve opening pressure.

It is a sectional view showing a differential pressure valve concerning a 1st embodiment of the present invention. 1 is a front view showing a valve body of a differential pressure valve according to a first embodiment of the invention; FIG. FIG. 4 is a bottom view showing the valve body of the differential pressure valve according to the first embodiment of the present invention; 1 is a schematic diagram showing a differential pressure valve according to a first embodiment of the present invention and a vehicle to which it is connected; FIG. FIG. 5 is a cross-sectional view showing a differential pressure valve according to a second embodiment of the present invention; FIG. 5 is a plan view showing the valve body of the differential pressure valve according to the second embodiment of the present invention; FIG. 7 is a front view showing the valve body of the differential pressure valve according to the second embodiment of the present invention; FIG. 5 is a cross-sectional view showing a differential pressure valve according to a third embodiment of the invention; FIG. 11 is a front view showing a valve body of a differential pressure valve according to a third embodiment of the invention; FIG. 11 is a bottom view showing the valve body of the differential pressure valve according to the third embodiment of the present invention;

An embodiment of the present invention will be described based on the drawings.

[First embodiment]
A first embodiment will be described with reference to FIGS. 1 to 4. FIG.

As shown in FIG. 1, a differential pressure valve 11 according to the first embodiment has a housing 12 made of metal. A first seat portion 15 and a second seat portion 16 are arranged side by side on the outer surface of the housing 12 . The outer seating surfaces of the first seat portion 15 and the second seat portion 16 are arranged on the same plane. A first valve hole 21 and a second valve hole 22 are formed in the housing 12 . The first valve hole 21 is bored perpendicular to the seat surface of the first seat portion 15 from the first seat portion 15 to a predetermined intermediate position in the housing 12 . The second valve hole 22 is drilled perpendicularly to the seat surface of the second seat portion 16 from the second seat portion 16 to a predetermined intermediate position in the housing 12 . The first valve hole 21 and the second valve hole 22 are parallel. The first valve hole 21 and the second valve hole 22 have the same shape and are aligned in the axial direction.

The first valve hole 21 has a first bottom hole portion 31, a first mounting hole portion 32, a first main hole portion 33 and a first screw hole portion 34 in order from the innermost side. The first bottom hole portion 31, the first attachment hole portion 32, the first main hole portion 33, and the first screw hole portion 34 are coaxially arranged with their central axes aligned. The inner diameter of the first mounting hole portion 32 is larger than the inner diameter of the first bottom hole portion 31 . The inner diameter of the first main hole portion 33 is larger than the inner diameter of the first mounting hole portion 32 . The minimum inner diameter of the first screw hole portion 34 is larger than the inner diameter of the first main hole portion 33 . The first valve hole 21 has a first screw hole portion 34 that opens to the outside of the housing 12 at the position of the first seat portion 15 .

The second valve hole 22 has a second bottom hole portion 41, a second mounting hole portion 42, a second main hole portion 43, and a second screw hole portion 44 in order from the innermost side. The second bottom hole portion 41, the second mounting hole portion 42, the second main hole portion 43, and the second screw hole portion 44 are coaxially arranged with their central axes aligned. The inner diameter of the second mounting hole portion 42 is larger than the inner diameter of the second bottom hole portion 41 . The inner diameter of the second main hole portion 43 is larger than the inner diameter of the second mounting hole portion 42 . The minimum inner diameter of the second screw hole portion 44 is larger than the inner diameter of the first main hole portion 33 . The second valve hole 22 has a second threaded hole portion 44 that opens out of the housing 12 at the location of the second seat portion 16 .

A first internal passage 51 , a second internal passage 52 , a first inflow passage 53 , and a second inflow passage 54 are formed in the housing 12 . One end of the first internal passage 51 opens into the first main hole portion 33 and the other end opens into the second bottom hole portion 41 . The second internal passage 52 has one end open to the second main hole portion 43 and the other end to the first bottom hole portion 31 . The first inflow passage 53 opens the first bottom hole 31 to the outside of the housing 12 . The second inflow passage 54 opens the second bottom hole 41 to the outside of the housing 12 .

The first internal passage 51 includes a first outlet 61 (outlet) opening to the first main hole portion 33, a first communication port 62 opening to the second bottom hole portion 41, the first outlet 61 and the first outlet. It has a first intermediate passage portion 63 that connects with the first communication port 62 . The first outflow port 61 opens at a predetermined position in the axial direction of the first main hole portion 33 and extends along the radial direction of the first main hole portion 33 . The first communication port 62 extends along the radial direction of the second bottom hole portion 41 . The first intermediate passage portion 63 extends in the axial direction of the first valve hole 21 .

The second internal passage 52 includes a second outflow port 71 (outflow port) that opens into the second main hole portion 43, a second communication port 72 that opens into the first bottom hole portion 31, a second outflow port 71, and a second outlet port. It has a second intermediate passage portion 73 that connects with the two communication ports 72 . The second outflow port 71 opens at a predetermined position in the axial direction of the second main hole portion 43 and extends along the radial direction of the second main hole portion 43 . The second communication port 72 extends along the radial direction of the first bottom hole portion 31 . The second intermediate passage portion 73 extends in the axial direction of the second valve hole 22 .

The differential pressure valve 11 has a first valve component 81 incorporated in the first valve hole 21 and a second valve component 82 incorporated in the second valve hole 22 . The first valve hole 21 and the first valve component 81 constitute a first valve mechanism 83 . The second valve hole 22 and the second valve component 82 constitute a second valve mechanism 84 . The first valve-constituting portion 81 and the second valve-constituting portion 82 have the same configuration. Since the first valve hole 21 and the second valve hole 22 have the same shape, the first valve mechanism 83 and the second valve mechanism 84 also have the same configuration.

Here, the first valve-constituting portion 81 of the first valve-constituting portion 81 and the second valve-constituting portion 82 having the same configuration will be described as an example.

The first valve component 81 has a seat member 91 , a lid member 92 , a washer 93 and a biasing member 95 . The seat member 91 is fitted into the first mounting hole portion 32 of the first valve hole 21 . The lid member 92 is screwed into the first screw hole portion 34 of the first valve hole 21 . The washer 93 is interposed between the lid member 92 and the first seat portion 15 . The valve body 94 is movably provided within the first main hole portion 33 . The biasing member 95 biases the valve body 94 toward the seat member 91 .

A passage hole 101 extending in the axial direction is formed through the sheet member 91 at the center in the radial direction. The seat member 91 includes an annular base portion 103 and an annular seat portion 104 having an outer diameter smaller than the outer diameter of the base portion 103 and protruding axially outward from one axial end of the base portion 103 . have. The base portion 103 and the seat portion 104 are arranged coaxially with their central axes aligned. The seat member 91 is fixed to the housing 12 by fitting the base portion 103 into the first attachment hole portion 32 . The orientation of the seat member 91 at this time is such that the seat portion 104 is arranged on the first main hole portion 33 side of the first valve hole 21 . The seat portion 104 surrounds the passage hole 101 over the entire circumference. Thus, the seat portion 104 is formed on the seat member 91 which is separate from the housing 12 .

The passage hole 101 of the sheet member 91 fixed to the first attachment hole portion 32 of the housing 12 communicates with the first bottom hole portion 31 and together with the first bottom hole portion 31 constitutes an inlet 106 . . The seat portion 104 is formed so as to surround the inlet 106 . The inflow port 106 including the passage hole 101 of the seat member 91 of the first valve component 81 always communicates with the first inflow passage 53 . The seat member 91 of the second valve component 82 is also fixed to the second mounting hole portion 42 of the housing 12 . An inflow port 106 formed by the passage hole 101 of the sheet member 91 and the second bottom hole portion 41 always communicates with the second inflow passage 54 .

As shown in FIGS. 2 and 3, the valve body 94 is circular. Specifically, the valve body 94 has a stepped cylindrical shape. The valve body 94 has a solid columnar shaft portion 111 and a disc-shaped flange portion 112 (first flange portion) extending radially outward from one axial end side of the shaft portion 111 . The shaft portion 111 and the flange portion 112 are arranged coaxially with the center axis aligned. A plurality of recesses 116 (first recesses) having the same shape and being recessed radially inward from the cylindrical outermost peripheral surface 114 are formed on the outer peripheral portion of the collar portion 112 . The recessed portions 116 are formed at an odd number of locations at equal intervals in the circumferential direction of the flange portion 112 . Specifically, the recesses 116 are formed at three locations at intervals of 120° in the circumferential direction of the collar portion 112 .

As a result, a projecting portion 118 (first projecting portion) is formed between adjacent recesses 116 in the circumferential direction on the outer peripheral portion of the collar portion 112 . The protruding portion 118 (first protruding portion) protrudes outward in the radial direction of the flange portion 112 from the most recessed position of the recess portion 116 . All the projecting portions 118 of the collar portion 112 have the same shape. The length of the protruding portion 118 in the circumferential direction of the collar portion 112 is longer than the length of the recessed portion 116 in the same direction. The protruding portions 118 are formed at an odd number of locations at equal intervals in the circumferential direction of the collar portion 112 . Specifically, the protruding portions 118 are formed at three locations at intervals of 120° in the circumferential direction of the collar portion 112 .

The collar portion 112 has an annular flange base end portion 121 between the plurality of projecting portions 118 and the shaft portion 111 . A plurality of protruding portions 118 protrude radially outward from the flange base end portion 121 . As shown in FIG. 1 , the flange base end portion 121 has an outer diameter larger than the outer diameter of the seat portion 104 of the seat member 91 . In other words, the minimum outer diameter of the collar portion 112 is larger than the outer diameter of the seat portion 104 . Therefore, the maximum outer diameter of the flange portion 112 , that is, the maximum outer diameter of the valve body 94 is also larger than the outer diameter of the seat portion 104 . The maximum outer diameter of the collar portion 112 is slightly smaller than the inner diameter of the first main hole portion 33 .

The valve body 94 is inserted into the first main hole portion 33 with the flange portion 112 facing toward the seat portion 104 . In this state, the valve body 94 can be seated on the seat portion 104 . The valve body 94 has a disk-shaped seat body 123 at the center in the radial direction of the end portion of the collar portion 112 opposite to the side where the shaft portion 111 protrudes. A portion of the valve body 94 to be seated on the seat portion 104 is composed of the seat body 123 . In other words, the seat body 123 constitutes the flange base end portion 121 . A portion of the valve body 94 other than the seat body 123 is a valve body 124 . The valve body 124 is made of a material different from that of the seat body 123 . For example, the seat body 123 is made of synthetic resin, and the valve body 124 is made of metal. The valve body 124 includes the entire side of the shaft portion 111 protruding from the flange portion 112, a portion of the shaft portion 111 that overlaps the flange portion 112 in the axial direction, and a portion of the flange portion 112 on the side from which the shaft portion 111 protrudes. , and a radially outer portion of the flange portion 112 . The valve body 124 is integrally molded.

As shown in FIG. 3, an odd number of recesses 116 and projections 118 are formed on the outer peripheral portion of the collar portion 112 . For this reason, recesses 116 are provided at positions 180 degrees opposite to all protrusions 118 in the circumferential direction of each flange 112 . In other words, the flange portion 112 has a plurality of protrusions 118 that protrude radially outward, and the plurality of protrusions 118 that are recessed radially inward at positions on opposite sides of the flange portion 112 in the circumferential direction. and a recess 116 .

As shown in FIG. 1, the cover member 92 has a head portion 131, a disk portion 132, a screw shaft portion 133 and a projecting shaft portion 134 in order from one side in the axial direction. The head 131 is a portion that is engaged with a screwing tool such as a wrench. The head 131 has a hexagonal outer shape. The disc portion 132 has an outer diameter larger than the maximum outer diameter of the head portion 131 . The screw shaft portion 133 has a maximum outer diameter smaller than the outer diameter of the disk portion 132 . The projecting shaft portion 134 is columnar. The projecting shaft portion 134 has a smaller diameter than the minimum outer diameter of the screw shaft portion 133 . The head portion 131, the disk portion 132, the screw shaft portion 133, and the protruding shaft portion 134 are coaxially arranged with their central axes aligned.

The cover member 92 of the first valve-constituting portion 81 is inserted into the first valve hole 21 with the projecting shaft portion 134 leading. At that time, the screw shaft portion 133 is screwed into the first screw hole portion 34 . At this time, an annular washer 93 is interposed between the disk portion 132 and the first seat portion 15 . The cover member 92 is screwed into the first valve hole 21 and is axially rotated with the projecting shaft portion 134 and the shaft portion 111 of the valve body 94 of the first valve-constituting portion 81 substantially aligned with the center axis. Oppose. A predetermined gap is provided in the axial direction between the shaft portion 111 of the valve body 94 and the protruding shaft portion 134 of the lid member 92 while the valve body 94 is in contact with the seat portion 104 . The valve body 94 moves axially within the range of this gap. At that time, the outermost peripheral surface 114 of the collar portion 112 is guided by the inner peripheral surface 138 of the first main hole portion 33 , which is the cylindrical surface. Even if the valve body 94 moves within the above range, the flange 112 is always between the inlet 106 and the first outlet 61 .

The biasing member 95 is a coil spring. The protruding shaft portion 134 of the lid member 92 is inserted inside one axial end portion of the biasing member 95 , and the shaft portion 111 of the valve body 94 is inserted inside the other axial end portion of the biasing member 95 . One end of the biasing member 95 in the axial direction contacts the end face of the screw shaft 133 of the lid member 92 on the projecting shaft 134 side, and the other axial end of the biasing member 95 contacts the shaft 111 of the flange 112 of the valve body 94 . abuts on the protruding end face. The biasing member 95 biases the valve body 94 in the valve closing direction toward the seat portion 104 .

When the differential pressure in the valve opening direction received by the valve body 94 is smaller than a predetermined value, the valve body 94 abuts against the seat portion 104 due to the biasing force of the biasing member 95 to close the inlet 106 . When the differential pressure in the valve opening direction received by the valve body 94 exceeds a predetermined value, the valve body 94 is separated from the seat portion 104 against the biasing force of the biasing member 95 to open the inlet 106 . At that time, the outermost peripheral surface 114 of the flange portion 112 is guided by the inner peripheral surface 138 of the first main hole portion 33 and the valve body 94 moves in the axial direction.

A valve chamber 141 is formed by being surrounded by the first main hole portion 33 of the housing 12 , the lid member 92 and the seat member 91 . The valve element 94 is provided axially movably within the valve chamber 141 . The seat member 91 forms a bottom portion 142 of the valve chamber 141 . Therefore, the seat portion 104 on which the valve body 94 is seated is provided at the bottom portion 142 of the valve chamber 141 . The inlet 106 including the passage hole 101 of the seat member 91 is formed in the bottom portion 142 of the valve chamber 141 . The inner peripheral surface 138 of the first main hole portion 33 is also the inner peripheral surface 138 of the valve chamber 141 .

A first outflow port 61 that opens into the first main hole portion 33 is formed in the inner peripheral surface 138 of the valve chamber 141 of the first valve mechanism 83 . Similarly, the second outflow port 71 opening into the second main hole portion 43 is formed in the inner peripheral surface 138 of the valve chamber 141 of the second valve mechanism 84 .

The valve body 94 has a flange portion 112 on the bottom portion 142 side of the valve chamber 141 . The collar portion 112 extends radially outward from the seat portion 104 . A plurality of protruding portions 118 of the flange portion 112 protrude radially outward from the flange base end portion 121 toward the inner peripheral surface 138 of the valve chamber 141 . The plurality of recesses 116 of the collar portion 112 are recessed radially inward of the collar portion 112 at positions opposite to the protrusions 118 in the circumferential direction. Collar portion 112 includes a plurality of protrusions 118 and recesses 116 . The plurality of protruding portions 118 protrude radially outward from the flange base end portion 121 toward the inner peripheral surface 138 of the valve chamber 141 . The recessed portion 116 is recessed radially inward at a position opposite to the protruding portion 118 in the circumferential direction.

As schematically shown in FIG. 4 , the differential pressure valve 11 is arranged in communication passages 158 and 159 connecting two air springs 155 and 156 provided between a vehicle body 152 of a vehicle 151 and a bogie 153 . The differential pressure valve 11 opens and closes communication passages 158 and 159 according to the pressure difference between the two air springs 155 and 156 .

One air spring 155 and the first inflow passage 53 communicate with each other via a passage portion 161 . The other air spring 156 and the second inflow passage 54 communicate with each other via a passage portion 162 . A passage portion 161 extending from one air spring 155 , a first inflow passage 53 , an inflow port 106 of the first valve mechanism 83 , a valve chamber 141 of the first valve mechanism 83 , and the first internal passage 51 , the inflow port 106 of the second valve mechanism 84 , the second inflow passage 54 and the passage portion 162 constitute a communication passage 158 connecting the two air springs 155 and 156 . Also, the passage portion 162 extending from the other air spring 156, the second inflow passage 54, the inflow port 106 of the second valve mechanism 84, the valve chamber 141 of the second valve mechanism 84, and the second internal passage 52 , the inflow port 106 of the first valve mechanism 83 , the first inflow passage 53 , and the passage portion 161 constitute a communication passage 159 that connects the two air springs 155 and 156 .

The first valve mechanism 83 is arranged in the communication path 158 and opens and closes the communication path 158 according to the pressure difference between the two air springs 155 and 156 . That is, when the pressure of the air spring 155 becomes higher than the pressure of the air spring 156 , the valve body 94 is released from the seat portion 104 against the biasing force of the biasing member 95 to open the inlet 106 . Then, the communication passage 158 is opened, and the air of the air spring 155 flows through the communication passage 158, that is, the passage portion 161, the first inflow passage 53, the inflow port 106 of the first valve mechanism 83, and the valve chamber 141 of the first valve mechanism 83. , first internal passage 51 including first outlet 61 , inlet 106 of second valve mechanism 84 , second inlet passage 54 and passage 162 to air spring 156 . This causes the pressure of air spring 155 to drop closer to the pressure of air spring 156 .

Air from one of the air springs 155 flows into the inlet 106 formed in the bottom 142 of the valve chamber 141 . A first outflow port 61 of the first internal passage 51 is formed in the inner peripheral surface 138 of the valve chamber 141 of the first valve mechanism 83 and allows air to flow out to the other air spring 156 .

The first outflow port 61 intersects the direction connecting the inflow port 106 and the valve chamber 141 , that is, the axial direction of the first valve hole 21 . Specifically, the first outflow port 61 is orthogonal to the axial direction of the first valve hole 21 . Therefore, when air flows from the inlet 106 to the first outlet 61 through the valve chamber 141, the air that has flowed from the inlet 106 into the valve chamber 141 is mainly and the inner peripheral surface 138 of the valve chamber 141 in the axial direction of the valve body 94 , and then changes direction in the radial direction of the valve body 94 and flows out from the first outlet 61 .

The second valve mechanism 84 is arranged in the communication path 159 and opens and closes the communication path 159 according to the pressure difference between the two air springs 155 and 156 . That is, when the pressure of the air spring 156 becomes higher than the pressure of the air spring 155 , the valve body 94 is separated from the seat portion 104 against the biasing force of the biasing member 95 to open the inlet 106 . Then, the communication passage 159 is opened, and the air of the air spring 156 flows through the communication passage 159, that is, the passage portion 162, the second inflow passage 54, the inflow port 106 of the second valve mechanism 84, and the valve chamber 141 of the second valve mechanism 84. , the second internal passage 52 including the second outlet 71 , the inlet 106 of the first valve mechanism 83 , the first inlet passage 53 and the passage portion 161 to the air spring 155 . This causes the pressure of air spring 156 to drop closer to the pressure of air spring 155 .

Air from the other air spring 156 flows into the inlet 106 formed in the bottom 142 of the valve chamber 141 . A second outflow port 71 of the second internal passage 52 is formed in the inner peripheral surface 138 of the valve chamber 141 of the second valve mechanism 84 to allow air to flow out to one of the air springs 155 .

The second outlet 71 intersects the direction connecting the inlet 106 and the valve chamber 141 , that is, the axial direction of the second valve hole 22 . Specifically, the second outflow port 71 is perpendicular to the axial direction of the second valve hole 22 . Therefore, when air flows from the inlet 106 to the second outlet 71 through the valve chamber 141, the air that has flowed from the inlet 106 into the valve chamber 141 is mainly , and the inner peripheral surface 138 of the valve chamber 141 in the axial direction of the valve body 94 .

In the above-mentioned Patent Document 1, a differential pressure valve that opens and closes the communication path according to the pressure difference between the two air springs provided between the vehicle body and the bogie is provided in the communication path that connects the two air springs provided between the vehicle body and the bogie in the railway vehicle. It is disclosed to provide In such a differential pressure valve, it is required to suppress variations in valve opening pressure.

In the differential pressure valve 11 of the first embodiment, in the first valve mechanism 83, the inlet 106 through which the air of one air spring 155 flows is formed in the bottom 142 of the valve chamber 141, and the air flows out to the other air spring 156. A first outflow port 61 is formed in the inner peripheral surface 138 of the valve chamber 141 . With such a structure, the first outflow port 61 intersects the direction connecting the inflow port 106 and the valve chamber 141 . Therefore, when air flows from the inlet 106 to the first outlet 61 through the valve chamber 141, the air that has flowed from the inlet 106 into the valve chamber 141 is mainly and the inner peripheral surface 138 of the valve chamber 141 in the axial direction of the valve body 94 , and then changes direction in the radial direction of the valve body 94 and flows out from the first outlet 61 . At this time, if the recess 116 is positioned on the opposite side of the first outlet 61 in the circumferential direction of the valve body 94 , the flow of air passing through the recess 116 toward the first outlet 61 causes the valve body 94 to move toward the first outlet 61 . A large radial force acts toward the first outlet 61 . As a result, the valve body 94 inclines in the valve chamber 141 such that the end of the collar portion 112 opposite to the seat portion 104 is closer to the first outflow port 61 than the end of the seat portion 104 side. there is a possibility.

On the other hand, the first valve mechanism 83 is provided with an arcuate projecting portion 118 at a position opposite to the concave portion 116 of the flange portion 112 of the valve body 94 in the circumferential direction. Therefore, even if the valve body 94 is tilted as described above, the projecting portion 118 is in line contact with the inner peripheral surface 138 of the valve chamber 141, and the contact surface pressure is reduced. Therefore, the axial movement of the valve body 94 becomes smooth. Therefore, it is possible to suppress variations in the valve opening pressure. That is, if the recessed portion 116 is formed at a position on the opposite side of the recessed portion 116 in the circumferential direction, the valve body 94 will be positioned at both corners of the recessed portion 116 of the flange portion 112 in the circumferential direction when tilted as described above. It contacts the inner peripheral surface 138 of the valve chamber 141 by point contact. As a result, the contact surface pressure increases, causing galling or the like, and there is a possibility that the valve body 94 cannot move smoothly in the axial direction. The first valve mechanism 83 can reduce such possibility.

Protrusions 118 are formed on the valve body 94 at intervals of 120° in the circumferential direction. Therefore, the area of the outermost peripheral surface 114 of the valve body 94 can be increased. For example, it is possible to double the interval as compared with the case of 60° interval. Therefore, since the contact area between the inner peripheral surface 138 of the valve chamber 141 and the valve body 94 can be increased, the movement of the valve body 94 in the axial direction becomes smoother. Therefore, it is possible to further suppress variations in the valve opening pressure. In addition, since the recesses 116 are formed in the valve body 94 at intervals of 120° in the circumferential direction, the number of the recesses 116 can be reduced, and therefore the number of processing steps for the valve body 94 can be reduced.

The first valve mechanism 83 has the following structure. That is, the valve body 94 has a shaft portion 111 that protrudes from the collar portion 112 to the side opposite to the seat portion 104 . This shaft portion 111 is inserted into one end side of the biasing member 95 . As a result, one end of the biasing member 95 is brought into contact with the collar portion 112 . Also, the lid member 92 has a projecting shaft portion 134 on the biasing member 95 side. This projecting shaft portion 134 is inserted into the other end side of the biasing member 95 . As a result, the screw shaft portion 133 is brought into contact with the other end portion of the biasing member 95 . As a result, the biasing member 95 can be stabilized in posture and shortened in length. Therefore, it is possible to reduce the possibility of buckling of the biasing member 95 and to stabilize the expansion and contraction of the biasing member 95 . In addition, by shortening the urging member 95, tilting of the valve body 94 can be suppressed.

In addition, since the valve body 94 of the first valve mechanism 83 has a shape having only one collar portion 112, air can easily pass through, and the posture is stabilized without being affected by the air. Therefore, it is possible to further suppress variations in the valve opening pressure.

The second valve mechanism 84 is also the same.

[Second embodiment]
Next, the second embodiment will be described mainly with reference to FIGS. 5 to 7, focusing on the differences from the first embodiment. Parts common to those of the first embodiment are denoted by the same designations and the same reference numerals.

As shown in FIG. 5, the differential pressure valve 11A of the second embodiment is provided with a first valve mechanism 83A instead of the first valve mechanism 83 of the first embodiment. The differential pressure valve 11A is provided with a second valve mechanism 84A in place of the second valve mechanism 84 of the first embodiment. In the first valve mechanism 83A, the first valve component 81A is partially different from the first valve component 81 of the first embodiment. In the second valve mechanism 84A, the second valve configuration portion 82A is partially different from the second valve configuration portion 82 of the first embodiment. The first valve configuration portion 81A and the second valve configuration portion 82A have the same configuration. Therefore, the first valve component 81A will be described below as an example.

The first valve component 81A has a seat member 91, a lid member 92A, a washer 93, a valve body 94A, an urging member 95A, and a plurality of discs 200. As shown in FIG. The sheet member 91 is the same as in the first embodiment. The lid member 92A is screwed into the first screw hole portion 34 of the first valve hole 21 . The washer 93 is the same as in the first embodiment, and is interposed between the lid member 92A and the first seat portion 15. As shown in FIG. The valve body 94A is movably provided within the first main hole portion 33 . The biasing member 95A biases the valve body 94A toward the seat member 91.

As shown in FIGS. 6 and 7, the valve body 94A is circular. Specifically, the valve body 94A has a stepped bottomed cylindrical shape. The valve body 94A has a shaft portion 111A, a flange portion 112A (first flange portion), and a flange portion 212 (second flange portion). The flange portion 112A (first flange portion) extends radially outward from one axial end side of the shaft portion 111A. The flange portion 212 (second flange portion) extends radially outward from the other axial end side of the shaft portion 111A. The shaft portion 111A and the flange portions 112A and 212 are coaxially arranged with the central axes aligned.

As shown in FIG. 5, the shaft portion 111A is cylindrical with a bottom. The shaft portion 111A has a cylindrical body portion 201 and a bottom portion 202 closing one end of the body portion 201 . The collar portion 112A is provided at the end portion of the shaft portion 111A on the bottom portion 202 side. The collar portion 212 is provided at the open end on the side opposite to the bottom portion 202 of the shaft portion 111A. A through hole 204 is formed in the body portion 201 at a position between the flange portion 112A and the flange portion 212A. The through holes 204 penetrating the body portion 201 in the radial direction of the body portion 201 are formed at a plurality of, specifically, four locations at equal intervals in the circumferential direction of the body portion 201 .

A plurality of concave portions 116 (first concave portions) having the same shape are formed in the flange portion 112A, similarly to the flange portion 112 of the first embodiment. The recessed portion 116 (first recessed portion) is recessed radially inward from the cylindrical outermost peripheral surface 114 . Therefore, a plurality of protrusions 118 (first protrusions) having the same shape and projecting radially outward from the shaft 111A are formed on the flange 112A.

As shown in FIGS. 6 and 7, the flange portion 212 is formed with a plurality of concave portions 216 (second concave portions) having the same shape as in the case of the flange portion 112A. The recessed portion 216 (second recessed portion) is recessed radially inward from the cylindrical outermost peripheral surface 214 . The outer diameter of outermost peripheral surface 214 is the same as the outer diameter of outermost peripheral surface 114 . Recess 216 has the same shape as recess 116 . The recessed portions 216 are formed at an odd number of locations at equal intervals in the circumferential direction of the flange portion 212 . Specifically, the recesses 216 are formed at three locations at intervals of 120° in the circumferential direction of the collar portion 212 . The position of the recess 216 in the circumferential direction of the flange 212 is aligned with the recess 116 of the flange 112A.

A projecting portion 218 (second projecting portion) is formed between adjacent recesses 216 in the circumferential direction on the outer peripheral portion of the collar portion 212 . The protruding portion 218 (second protruding portion) protrudes radially outward from the collar portion 212 beyond the most recessed position of the recessed portion 216 . All the projecting portions 218 of the collar portion 212 have the same shape. The protrusion 218 has the same shape as the protrusion 118 . The collar portion 212 matches the position of the projection portion 218 in the circumferential direction with the projection portion 118 . In other words, the projecting portion 118 and the projecting portion 218 are aligned in the circumferential direction of the valve body 94A. The length of the protruding portion 218 in the circumferential direction of the collar portion 212 is longer than the length of the recessed portion 216 in the same direction. The protruding portions 218 are formed at an odd number of locations at equal intervals in the circumferential direction of the collar portion 212 . Specifically, the protruding portions 218 are formed at three locations at intervals of 120° in the circumferential direction of the collar portion 212 .

Therefore, the flange portion 112A and the flange portion 212 have the same shape, and are aligned in position (phase) in the circumferential direction of the valve body 94A. The through hole 204 of the shaft portion 111A is formed closer to the flange portion 112A than the flange portion 212 is.

As shown in FIG. 5 , the outer diameter of the bottomed cylindrical shaft portion 111A is larger than the outer diameter of the seat portion 104 of the seat member 91 . In other words, the minimum outer diameter of the collar portion 112A is larger than the outer diameter of the seat portion 104. As shown in FIG. Therefore, the maximum outer diameter of the flanges 112A and 212, that is, the maximum outer diameter of the valve body 94A is also larger than the outer diameter of the seat portion 104.
The maximum outer diameters of the flanges 112A and 212 are slightly smaller than the inner diameter of the first main hole portion 33 .

The valve body 94A is inserted into the first main hole portion 33 with the flange portion 112A facing toward the seat portion 104 and the flange portion 212 facing away from the seat portion 104 . In this state, the valve body 94A can be seated on the seat portion 104 at the bottom portion 202 of the shaft portion 111A. The valve body 94A has a seat body 123 similar to that of the first embodiment on the opposite side of the bottom portion 202 to the body portion 201 . A portion of the valve body 94</b>A that is seated on the seat portion 104 is also formed of this seat body 123 . A portion of the valve body 94A other than the seat body 123 is a valve main body 124A made of a material different from that of the seat body 123, for example, metal. The valve body 124A includes the entire shaft portion 111A except for the seating body 123, the flange portion 112A, and the flange portion 212, which are integrally formed.

As shown in FIG. 6, concave portions 216 and projecting portions 218 are formed in an odd number of locations on the collar portion 212 . For this reason, recesses 216 are provided at positions 180 degrees opposite to each of the protrusions 218 in the circumferential direction of each flange 212 . In other words, the flange portion 212 also has a plurality of protrusions 218 protruding radially outward from the shaft portion 111</b>A, and the plurality of protrusions 218 are located radially opposite to the flange portion 212 in the circumferential direction. and a recess 216 recessed inward.

As shown in FIG. 5, the lid member 92A has a head portion 131 and a disc portion 132 similar to those of the first embodiment, and a screw shaft portion 133A is provided on the opposite side of the disc portion 132 to the head portion 131. have. The screw shaft portion 133</b>A has a maximum outer diameter smaller than the outer diameter of the disc portion 132 . The head portion 131, the disk portion 132, and the screw shaft portion 133A are coaxially arranged with their central axes aligned.

A receiving hole 206 is formed in the radial center of the screw shaft portion 133A. The accommodation hole 206 is bored in the screw shaft portion 133A from the side opposite to the head portion 131 in the axial direction. The cover member 92A is inserted into the first valve hole 21 with the screw shaft portion 133A leading. At that time, the screw shaft portion 133A is screwed into the first screw hole portion 34 . At this time, the washer 93 is interposed between the disc portion 132 and the first seat portion 15 . In the first valve mechanism 83A, the cover member 92A is axially opposed to the collar portion 212 in a state where the housing hole 206 is substantially aligned with the center axis of the valve body 94A while being screwed into the first valve hole 21. do. A predetermined gap is provided in the axial direction between the valve body 94A and the lid member 92A while in contact with the seat portion 104 . The valve body 94A moves in the axial direction within the range of this gap. At that time, the outermost peripheral surfaces 114 and 214 of the flanges 112A and 212 of the valve body 94A are guided to the inner peripheral surface 138 of the first main hole portion 33 . Even if the valve body 94A moves within the above range, the collar portion 112A is always between the inflow port 106 and the first outflow port 61 .

The biasing member 95A is a coil spring. One axial end of the biasing member 95A is inserted into the housing hole 206 of the lid member 92A, and the other axial end is inserted into the trunk portion 201 of the valve body 94A. One axial end of the biasing member 95A abuts against the bottom of the housing hole 206 of the lid member 92A through the plurality of discs 200, and the other axial end abuts against the bottom 202 of the valve body 94A. Therefore, the biasing member 95A is axially longer than the biasing member 95 of the first embodiment. The biasing member 95A biases the valve body 94A toward the seat portion 104 in the valve closing direction.

Therefore, when the differential pressure in the valve opening direction received by the valve body 94A is smaller than a predetermined value, the valve body 94A contacts the seat portion 104 due to the biasing force of the biasing member 95A to close the inlet 106 . Further, when the differential pressure in the valve opening direction received by the valve body 94A exceeds a predetermined value, the valve body 94A is separated from the seat portion 104 against the biasing force of the biasing member 95A to open the inflow port 106 . At that time, the outermost peripheral surfaces 114, 214 of the flanges 112A, 212 are guided by the inner peripheral surface 138 of the first main hole portion 33, and the valve body 94A moves in the axial direction.

A valve chamber 141A is formed by being surrounded by the first main hole portion 33 of the housing 12, the lid member 92A, and the seat member 91. As shown in FIG. The valve element 94A is provided axially movably within the valve chamber 141A. The seat member 91 forms a bottom portion 142 of the valve chamber 141A. A seat portion 104 on which the valve body 94A is seated is provided at the bottom portion 142 of the first valve chamber 141A. The inlet 106 including the passage hole 101 of the seat member 91 is formed in the bottom portion 142 of the valve chamber 141A. The inner peripheral surface 138 of the first main hole portion 33 is also the inner peripheral surface 138 of the valve chamber 141A.

A first outflow port 61 opening into the first main hole portion 33 is formed in the inner peripheral surface 138 of the valve chamber 141A of the first valve mechanism 83A. Similarly, the second outflow port 71 opening into the second main hole portion 43 is formed in the inner peripheral surface 138 of the valve chamber 141A of the second valve mechanism 84A.

The valve body 94A has a flange portion 112A on the bottom portion 142 side of the valve chamber 141A. The collar portion 112A extends radially outward from the seat portion 104 . A plurality of protruding portions 118 of the flange portion 112A protrude radially outward from the shaft portion 111A toward the inner peripheral surface 138 of the valve chamber 141A. The plurality of recesses 116 of the collar portion 112A are recessed radially inward of the collar portion 112A at positions opposite to the protrusions 118 in the circumferential direction.

The valve body 94A has a flange portion 212 on the side opposite to the bottom portion 142 . The collar portion 212 extends radially outward from the shaft portion 111A toward the inner peripheral surface 138 of the valve chamber 141A. A plurality of protruding portions 218 of the flange portion 212 protrude radially outward from the shaft portion 111A toward the inner peripheral surface 138 of the valve chamber 141A. The plurality of recesses 216 of the collar portion 212 are recessed radially inward of the collar portion 212 at positions opposite to the protrusions 218 in the circumferential direction.

In the first valve mechanism 83A, the first outflow port 61 intersects, specifically perpendicular to, the direction connecting the inflow port 106 and the valve chamber 141A. Therefore, when air flows from the inlet 106 to the first outlet 61 through the valve chamber 141A, the air that has flowed into the valve chamber 141A from the inlet 106 is and the inner peripheral surface 138 of the valve chamber 141A in the axial direction of the valve body 94A, and then changes direction in the radial direction of the valve body 94A and flows out from the first outlet 61. As shown in FIG.

In the second valve mechanism 84A, the second outflow port 71 intersects, specifically perpendicular to, the direction connecting the inflow port 106 and the valve chamber 141A. Therefore, when air flows from the inflow port 106 to the second outflow port 71 through the valve chamber 141A, the air that has flowed into the valve chamber 141A from the inflow port 106 mainly and the inner peripheral surface 138 of the valve chamber 141A in the axial direction of the valve body 94A, and then changes direction in the radial direction of the valve body 94A and flows out from the second outlet 71. As shown in FIG.

In the differential pressure valve 11A, similarly to the valve chamber 141 of the first embodiment, the valve chamber 141A of the first valve mechanism 83A constitutes a communication passage 158 that communicates the air springs 155 and 156 with each other. A valve chamber 141A of the second valve mechanism 84A constitutes a communication passage 159 that communicates the air springs 155 and 156 with each other.

In the differential pressure valve 11A of the second embodiment, in the first valve mechanism 83A, the inlet 106 through which the air of one air spring 155 flows is formed in the bottom 142 of the valve chamber 141A, and the air flows out to the other air spring 156. A first outflow port 61 is formed in the inner peripheral surface 138 of the valve chamber 141A.
With such a structure, the first outflow port 61 intersects the direction connecting the inflow port 106 and the valve chamber 141A. Therefore, in the first valve mechanism 83A, when air flows from the inflow port 106 to the first outflow port 61 via the valve chamber 141A, the air that has flowed into the valve chamber 141A from the inflow port 106 mainly flows into the valve body 94A. After passing in the axial direction of the valve body 94A between the recessed portion 116 of the flange portion 112A and the inner peripheral surface 138 of the valve chamber 141A, the fluid changes direction in the radial direction of the valve body 94A and flows out from the first outlet 61. . At this time, if the recess 116 is located on the opposite side of the first outlet 61 in the circumferential direction of the valve body 94A, the flow of air passing through the recess 116 toward the first outlet 61 causes the valve body 94A to move toward the first outlet. A large radial force acts toward the first outlet 61 . As a result, the valve body 94A may incline so that the flange portion 212 on the side opposite to the seat portion 104 is closer to the first outflow port 61 than the flange portion 112B on the seat portion 104 side in the valve chamber 141A. There is

On the other hand, the first valve mechanism 83A is provided with arcuate protruding portions 118, 218 at positions opposite to the concave portions 116, 216 of the flange portion 112A of the valve body 94A in the circumferential direction. Therefore, even if the valve body 94A is tilted as described above, the projecting portion 218 is in line contact with the inner peripheral surface 138 of the valve chamber 141A, and the contact surface pressure is reduced. Therefore, the axial movement of the valve body 94A becomes smooth. Therefore, it is possible to suppress variations in the valve opening pressure.

In the first valve mechanism 83A, in addition to the protrusions 118, protrusions 218 are also formed on the valve body 94A at intervals of 120° in the circumferential direction. Therefore, the area of the outermost peripheral surface 214 of the valve body 94A can be increased. Therefore, since the contact area between the inner peripheral surface 138 of the valve chamber 141A and the valve body 94A can be increased, the axial movement of the valve body 94A is further smoothed. Therefore, it is possible to further suppress variations in the valve opening pressure. Further, since the recesses 216 are formed in the valve body 94A at intervals of 120° in the circumferential direction, the number of the recesses 216 can be reduced. Therefore, the man-hours for processing the valve body 94A can be reduced.

In addition, since the protruding portion 118 and the protruding portion 218 are aligned in the circumferential direction of the valve body 94A, it is possible to reduce the number of man-hours for processing the valve body 94A and prevent air flow around the valve body 94A. It can smooth the flow.

The same applies to the second valve mechanism 84A.

[Third Embodiment]
Next, the third embodiment will be described mainly based on FIGS. 8 to 10, focusing on the differences from the second embodiment. Parts common to those of the second embodiment are denoted by the same designations and the same reference numerals.

As shown in FIG. 8, the differential pressure valve 11B of the third embodiment is provided with a first valve mechanism 83B instead of the first valve mechanism 83A of the second embodiment. The differential pressure valve 11B is provided with a second valve mechanism 84B instead of the second valve mechanism 84A of the second embodiment. In the first valve mechanism 83B, the first valve component 81B is partially different from the first valve component 81A of the second embodiment. In the second valve mechanism 84B, the second valve configuration portion 82B is partially different from the second valve configuration portion 82A of the second embodiment. Here, the first valve configuration portion 81B and the second valve configuration portion 82B have the same configuration. Therefore, the first valve configuration portion 81B of these will be described as an example.

The first valve component 81B has a valve body 94B. The valve body 94B is partially different from the valve body 94A of the second embodiment. As shown in FIGS. 9 and 10, the valve body 94B has a shaft portion 111A, a flange portion 112B (first flange portion), and a flange portion 212B (second flange portion). 111 A of axial parts are the same as that of 2nd Embodiment. The flange portion 112B (first flange portion) extends radially outward from one axial end side of the shaft portion 111A. The flange portion 212B (second flange portion) extends radially outward from the other axial end side of the shaft portion 111A. The shaft portion 111A and the flange portions 112B and 212B are coaxially arranged with the central axes aligned. As shown in FIG. 8, the collar portion 112B is provided on the bottom portion 202 side of the shaft portion 111A. The collar portion 212B is provided on the side opposite to the bottom portion 202 of the shaft portion 111A.

A plurality of concave portions 116B (first concave portions) having the same shape are formed in the collar portion 112B. The recessed portion 116B (first recessed portion) is recessed radially inward from the cylindrical outermost peripheral surface 114B. An even number of recesses 116B are formed at even intervals in the circumferential direction of the flange 112B. Specifically, six recesses 116B are formed at intervals of 60° in the circumferential direction of the flange 112B.

As a result, a protruding portion 118B (first protruding portion) is formed between the recessed portions 116B adjacent to each other in the circumferential direction on the outer peripheral portion of the flange portion 112B. The protruding portion 118B protrudes radially outward from the collar portion 112B from the most recessed position of the recessed portion 116B. All the projecting portions 118B of the collar portion 112B have the same shape. The length of the protruding portion 118B in the circumferential direction of the collar portion 112B is shorter than the length of the recessed portion 116B in the same direction. The projecting portions 118B are formed at an even number of locations at equal intervals in the circumferential direction of the collar portion 112B. Specifically, six projecting portions 118B are formed at intervals of 60° in the circumferential direction of the collar portion 112B.

A plurality of concave portions 216B (second concave portions) having the same shape are formed in the flange portion 212B. The recessed portion 216B (second recessed portion) is recessed radially inward from the cylindrical outermost peripheral surface 214B. The outer diameter of the outermost peripheral surface 214B is the same diameter as the outer diameter of the outermost peripheral surface 114B. The recess 216B has the same shape as the recess 116B. An even number of recesses 216B are formed at even intervals in the circumferential direction of the collar portion 212B. Specifically, six recesses 216B are formed at intervals of 60° in the circumferential direction of the flange 212B. The position of the recess 216B in the circumferential direction of the flange 212B is aligned with the protrusion 118B of the flange 112B.

A protruding portion 218B (second protruding portion) is formed between adjacent recesses 216B in the circumferential direction on the outer peripheral portion of the collar portion 212B. The protruding portion 218B (second protruding portion) protrudes outward in the radial direction of the flange portion 212B from the most recessed position of the recessed portion 216B. All the projecting portions 218B of the collar portion 212B have the same shape. The projecting portion 218B has the same shape as the projecting portion 118B. In the collar portion 212B, the position of the protruding portion 218B in the circumferential direction is aligned with the recessed portion 116B of the collar portion 112B. The length of the protruding portion 218B in the circumferential direction of the collar portion 212B is shorter than the length of the recessed portion 216B in the same direction. An even number of protrusions 218B are formed at equal intervals in the circumferential direction of the flange 212B. Specifically, six projecting portions 218B are formed at intervals of 60° in the circumferential direction of the collar portion 212B.

Therefore, the flange portion 112B and the flange portion 212B have the same shape, and the positions (phases) of the projecting portions 118B and 218B are shifted in the circumferential direction of the valve body 94B. In other words, the protruding portion 118B and the protruding portion 218B are displaced from each other in the circumferential direction of the valve body 94B.
The maximum outer diameters of the flanges 112B and 212B are slightly smaller than the inner diameter of the first main hole portion 33 .

As shown in FIG. 8, the valve body 94B is inserted into the first main hole portion 33 with the flange portion 112B on the seat portion 104 side and the flange portion 212B on the opposite side of the seat portion 104 . In this state, the valve body 94B can be seated on the seat portion 104 at the seat body 123 provided on the bottom portion 202 of the shaft portion 111A. A portion of the valve body 94B other than the seat body 123 is a valve main body 124B made of a material different from that of the seat body 123, for example, metal. The valve main body 124B includes the entire shaft portion 111A except for the seating body 123, the flange portion 112B, and the flange portion 212B, which are integrally formed.

Here, as shown in FIGS. 9 and 10, an even number of concave portions 116B and an even number of projecting portions 118B are formed on the collar portion 112B, and an even number of concave portions 216B and an even number of projecting portions 218B are formed on the collar portion 212B. For this reason, the projecting portions 118B are provided at positions opposite to all the projecting portions 118B of the flange portion 112B by 180 degrees in the circumferential direction of each valve body 94B. In addition, recesses 116B are provided at positions opposite to all recesses 116B of the flange 112B by 180 degrees in the circumferential direction of each valve body 94B. Moreover, the projecting portion 218B is provided at a position opposite to all the projecting portions 218B of the flange portion 212B by 180 degrees in the circumferential direction of each valve body 94B. In addition, recessed portions 216B are provided at positions opposite to all recessed portions 216B of the flange portion 212B by 180 degrees in the circumferential direction of each valve body 94B.

The recessed portion 116B of the flange portion 112B and the projecting portion 218B of the flange portion 212B are in phase, and the projecting portion 118B of the flange portion 112B and the recessed portion 216B of the flange portion 212B are in phase. For this reason, the recessed portion 216B of the flange portion 212B is provided at a position 180 degrees opposite to all the projecting portions 118B of the flange portion 112B in the circumferential direction of each valve body 94B. Further, the recessed portion 116B of the flange portion 112B is provided at a position 180 degrees opposite to all the projecting portions 218B of the flange portion 212B in the circumferential direction of each valve body 94B. In other words, the collar portion 112B has a plurality of protrusions 118B that protrude radially outward. The collar portion 212B has a recess 216B that is recessed radially inward at a position opposite to each of the protrusions 118B in the circumferential direction of the valve body 94B. In addition, the collar portion 212B has a plurality of protrusions 218B that protrude radially outward. The collar portion 112B has a recess 116B that is recessed radially inward at a position on the opposite side of the valve body 94B in the circumferential direction from each of the plurality of projecting portions 218B.

As shown in FIG. 8, the valve body 94B has a flange portion 112B on the bottom portion 142 side of the valve chamber 141A. The collar portion 112B extends radially outward from the seat portion 104 . A plurality of protruding portions 118B of the flange portion 112B protrude radially outward from the shaft portion 111A toward the inner peripheral surface 138 of the valve chamber 141A. The valve body 94B has a collar portion 212B that extends radially outward from the shaft portion 111A toward the inner peripheral surface 138 of the valve chamber 141A on the opposite side of the bottom portion 142 of the valve chamber 141A. The collar portion 212B has a plurality of protrusions 218B at positions that are circumferentially displaced from the protrusions 118B of the collar portion 112B. The protruding portion 218B protrudes radially outward from the shaft portion 111A toward the inner peripheral surface 138 of the valve chamber 141A.

In the first valve mechanism 83B, the first outflow port 61 intersects, specifically perpendicular to, the direction connecting the inflow port 106 and the valve chamber 141A. Therefore, when air flows from the inflow port 106 to the first outflow port 61 through the valve chamber 141A, the air that has flowed into the valve chamber 141A from the inflow port 106 mainly and the inner peripheral surface 138 of the valve chamber 141A in the axial direction of the valve body 94B, and then changes direction in the radial direction of the valve body 94B and flows out from the first outflow port 61 .

In the second valve mechanism 84B, the second outflow port 71 intersects, more specifically, perpendicular to the direction connecting the inflow port 106 and the valve chamber 141A. Therefore, when air flows from the inflow port 106 to the second outflow port 71 through the valve chamber 141A, the air that has flowed into the valve chamber 141A from the inflow port 106 mainly and the inner peripheral surface 138 of the valve chamber 141A in the axial direction of the valve body 94B, and then changes direction in the radial direction of the valve body 94B and flows out from the second outflow port 71 .

In the differential pressure valve 11B of the third embodiment, in the first valve mechanism 83B, the inlet 106 through which the air of one air spring 155 flows is formed in the bottom 142 of the valve chamber 141A, and the air flows out to the other air spring 156. A first outflow port 61 is formed in the inner peripheral surface 138 of the valve chamber 141A.
With such a structure, the first outflow port 61 intersects the direction connecting the inflow port 106 and the valve chamber 141A. Therefore, when air flows from the inflow port 106 to the first outflow port 61 through the valve chamber 141A, the air that has flowed into the valve chamber 141A from the inflow port 106 mainly and the inner peripheral surface 138 of the valve chamber 141A in the axial direction of the valve body 94B, and then changes direction in the radial direction of the valve body 94B and flows out from the first outflow port 61 . At this time, if the recess 116B is located on the opposite side of the first outlet 61 in the circumferential direction of the valve body 94B, the flow of air passing through the recess 116B toward the first outlet 61 causes the valve body 94B to move toward the first outlet. A large radial force acts toward the first outlet 61 . As a result, there is a possibility that the valve body 94B tilts so that the flange portion 212B on the side opposite to the seat portion 104 in the valve chamber 141A is closer to the first outflow port 61 than the flange portion 112B on the seat portion 104 side. be.

On the other hand, in the first valve mechanism 83B, an arcuate projecting portion 218B of the flange portion 212B of the valve body 94B is provided at a position opposite to the concave portion 116B in the circumferential direction. Therefore, even if the valve body 94B is tilted as described above, the projecting portion 218B is in line contact with the inner peripheral surface 138 of the valve chamber 141A, and the contact surface pressure is reduced. Therefore, the axial movement of the valve body 94B becomes smooth. Therefore, it is possible to suppress variations in the valve opening pressure.

In addition, since the protruding portion 118B and the protruding portion 218B are displaced from each other in the circumferential direction, the weight imbalance of the valve body 94B can be suppressed.

The same applies to the second valve mechanism 84B.

A first aspect of the above-described embodiment is arranged in a communication passage connecting two air springs provided between a vehicle body and a bogie, and the communication passage is adjusted according to the pressure difference between the two air springs. It is a differential pressure valve that opens and closes. The differential pressure valve includes a valve chamber, a circular valve body provided in the valve chamber, an inlet formed at the bottom of the valve chamber into which air from one of the air springs flows, and an inner portion of the valve chamber. an outflow port formed on the peripheral surface for discharging air to the other air spring; a seat portion formed at the bottom of the valve chamber so as to surround the inflow port and on which the valve body is seated; and an urging member that urges the seat portion in a valve closing direction. The valve body includes a first collar portion extending radially outward from the seat portion on the bottom portion side. The first flange portion includes a plurality of first protrusions that protrude radially outward toward the inner peripheral surface of the valve chamber, and a plurality of first protrusions that protrude radially inward at positions opposite to the first protrusions in the circumferential direction. and a recessed first recess. As a result, it is possible to suppress variations in the valve opening pressure.

In a second aspect, in the first aspect, the first protrusions are formed at intervals of 120° in the circumferential direction. As a result, it is possible to suppress variations in the valve opening pressure. Moreover, the man-hours for processing the valve body can be reduced.

Further, according to a third aspect, in the first or second aspect, the valve body has a second flange portion extending radially outward toward the inner peripheral surface of the valve chamber opposite to the bottom portion. The second flange portion includes a plurality of second protrusions that protrude radially outward toward the inner peripheral surface of the valve chamber, and radially opposite positions of the second protrusions in the circumferential direction. and a second recess recessed inward. As a result, it is possible to suppress variations in the valve opening pressure.

Further, according to a fourth aspect, in the third aspect, the second protrusions are formed at intervals of 120° in the circumferential direction. As a result, it is possible to suppress variations in the valve opening pressure.

Moreover, a 5th aspect is a 3rd or 4th aspect, and a said 1st protrusion part and a said 2nd protrusion part correspond in the circumferential direction, and are arrange|positioned. As a result, it is possible to reduce the number of man-hours for processing the valve body, and to make the flow of air around the valve body smooth.

Further, according to a sixth aspect, in the third or fourth aspect, the first projecting portion and the second projecting portion are displaced in the circumferential direction. Thereby, the imbalance of the weight of the valve body can be suppressed.

A seventh aspect is a differential pressure valve which is arranged in a communication passage connecting two air springs provided between a vehicle body and a bogie, and which opens and closes the communication passage according to the pressure difference between the two air springs. be. The differential pressure valve includes a valve chamber, a circular valve body provided in the valve chamber, an inlet formed at the bottom of the valve chamber into which air from one of the air springs flows, and an inner portion of the valve chamber. an outflow port formed on the peripheral surface for discharging air to the other air spring; a seat portion formed at the bottom of the valve chamber so as to surround the inflow port and on which the valve body is seated; and an urging member that urges the seat portion in a valve closing direction. The valve body includes a first brim portion extending radially outward from the seat portion on the bottom portion side, and a first brim portion extending radially outward from the seat portion, and on the side opposite to the bottom portion, diametrically toward the inner peripheral surface of the valve chamber. It has a second collar extending outwardly. The first flange portion has a plurality of first protrusions protruding radially outward toward the inner peripheral surface of the valve chamber. The second flange has a plurality of second projections radially outwardly projecting toward the inner peripheral surface of the valve chamber at positions circumferentially displaced from the first projections. As a result, it is possible to suppress variations in the valve opening pressure.

According to the differential pressure valve described above, it is possible to suppress variations in valve opening pressure.

11, 11A, 11B Differential pressure valve 61 First outlet (outlet)
71 second outlet (outlet)
94, 94A, 94B valve body 95 biasing member 104 seat portion 106 inlet 152 vehicle body 153 bogie 155, 156 air spring 158, 159 communication passage 141, 141A valve chamber 142 bottom portion 138 inner peripheral surface 112, 112A, 112B flange ( first collar)
116, 116B recess (first recess)
118, 118B projection (first projection)
212, 212B flange (second flange)
216, 216B recess (second recess)
218, 218B protrusion (second protrusion)

Claims (7)

A differential pressure valve that is arranged in a communication passage that connects two air springs provided between a vehicle body and a bogie, and that opens and closes the communication passage according to a pressure difference between the two air springs,
valve chamber;
a circular valve body provided in the valve chamber;
an inlet formed at the bottom of the valve chamber into which the air of one of the air springs flows;
an outflow port formed in the inner peripheral surface of the valve chamber for outflowing air to the other air spring;
a seat portion formed in a bottom portion of the valve chamber so as to surround the inflow port and on which the valve body is seated;
a biasing member that biases the valve body in a valve closing direction toward the seat;
has
The valve body includes, on the bottom side, a shaft portion that protrudes from the valve body and is arranged inside the biasing member, and a first collar portion that extends radially outward from the seat portion,
The first collar is
a plurality of first protrusions formed at regular intervals in the circumferential direction of the first flange and protruding radially outward toward the inner peripheral surface of the valve chamber;
a first recess that is arranged at a position opposite to each of the plurality of first protrusions in the circumferential direction and recessed radially inward;
with
A differential pressure valve, wherein the length of the first projection in the circumferential direction of the first brim is longer than the length of the first recess in the circumferential direction of the first brim. A differential pressure valve according to claim 1,
The differential pressure valve, wherein the first protrusions are formed at intervals of 120° in the circumferential direction. A differential pressure valve that is arranged in a communication passage that connects two air springs provided between a vehicle body and a bogie, and that opens and closes the communication passage according to a pressure difference between the two air springs,
valve chamber;
a circular valve body provided in the valve chamber;
an inlet formed at the bottom of the valve chamber into which the air of one of the air springs flows;
an outflow port formed in the inner peripheral surface of the valve chamber for outflowing air to the other air spring;
a seat portion formed in a bottom portion of the valve chamber so as to surround the inflow port and on which the valve body is seated;
a biasing member that biases the valve body in a valve closing direction toward the seat;
has
The valve body has a first brim portion extending radially outward from the seat portion on the side of the bottom portion. A second brim portion extending outward is provided,
the first brim includes a plurality of first protrusions protruding radially outward toward the inner peripheral surface of the valve chamber,
The differential pressure valve, wherein the second flange portion has a plurality of second protrusions protruding radially outward toward the inner peripheral surface of the valve chamber at positions circumferentially displaced from the first protrusions. A differential pressure valve according to claim 3,
The differential pressure valve, wherein the first protrusions are formed at intervals of 120° in the circumferential direction. The differential pressure valve according to claim 3 or 4,
The differential pressure valve, wherein the second protrusions are formed at intervals of 120° in the circumferential direction. A differential pressure valve according to claim 3,
The first collar portion includes a first concave portion recessed radially inward at a position on the opposite side of the first projecting portion in the circumferential direction;
A differential pressure valve. A differential pressure valve according to claim 3,
The second collar portion includes a second recess recessed radially inward at a position on the opposite side of the second protrusion in the circumferential direction;
A differential pressure valve.

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