JPWO2012120751A1 - Fitting - Google Patents

Abstract

In the joint 10 interposed in the pilot oil passage 4 via the relay passage 12 provided in the joint main body 11, a housing portion 13 is formed in the relay passage 12 of the joint main body 11, and the housing portion 13 has one opening end to the other. The valve structure 30 that constitutes the check valve 300 is disposed between the opening end of the valve structure and the valve structure 30 via the throttle hole 33 between the outer peripheral surface of the valve structure 30 and the inner peripheral surface of the accommodating portion 13. A bypass space 60 communicating with the inside of the body 30 is formed, and when the check valve 300 is closed, fluid is passed between one open end and the other open end of the valve component 30 through the throttle hole 33 and the bypass space 60. Circulate.

Description

  The present invention relates to a joint interposed in a fluid passage through a relay passage provided in a joint body, and particularly to a joint constituting a check valve.

  A joint having a check valve function has already been provided for the joint interposed in the fluid passage. For example, in Patent Document 1, a valve seat is formed in a relay passage formed in a joint body, a spherical valve body is disposed at a portion facing the valve seat, and further, between the valve body and the joint body. A pressing spring for pressing the valve body against the valve seat is provided. In the flow passage through which this joint is interposed, when the fluid is supplied in a direction to press the valve body against the valve seat, the relay passage is kept closed, and the passage of the fluid downstream is prevented. . On the other hand, when the fluid is supplied in the reverse direction and the pressure of the fluid overcomes the pressing force of the pressing spring, the valve body is separated from the valve seat, and the passage of the fluid downstream is allowed.

Japanese Utility Model Publication No. 6-49868

  By the way, a fluid passage to which this type of joint is applied is required to be set so that the fluid passage speed varies depending on the flow direction. For example, in a directional control valve that controls the flow rate and direction of oil with respect to a hydraulic actuator, a pressure chamber is provided on the end face of the spool, and a pilot pressure from the pilot operation valve to the pressure chamber corresponding to the operation direction of the operation lever. To operate the spool. In this hydraulic circuit, with respect to the oil passage communicating between the pilot operation valve and each pressure chamber, the oil passage speed is increased from the pilot operation valve to the pressure chamber, while on the other hand, from the pressure chamber to the pilot operation valve. There is a demand to slow down the passage speed of oil. This is because when the operation lever is operated quickly, the spool of the directional control valve is quickly switched so that the operation speed of the hydraulic actuator follows the operation of the operation lever.

  Such a requirement can be solved by adding an orifice in parallel with the check valve to provide a so-called slow return valve function. That is, when oil is supplied from the pressure chamber of the direction control valve to the pilot operation valve, the check valve is configured to block the valve passage by the valve body, and the orifice is configured to bypass the check valve, The valve passage blocked by the valve body may be always communicated by the orifice. According to the joint configured as described above, oil is supplied to the pressure chamber of the directional control valve by passing through the valve passage from the pilot operation valve, while only the orifice passes from the pressure chamber of the directional control valve. It will be returned to the pilot operated valve. Accordingly, when the operation lever is operated quickly, the spool of the direction control valve can be switched quickly and accurately, and the hydraulic actuator follows the operation.

  However, conventionally, when an orifice is added in parallel with the check valve, for example, a new cylindrical part is added to the outer periphery of the joint body, and the orifice is configured between the joint body and the tubular part. It is undeniable that the outer diameter dimension is significantly increased.

  In view of the above circumstances, the present invention suppresses a situation in which the outer diameter dimension is remarkably increased, and does not cause a problem in processing or a problem in strength, so that the passage speed of the fluid varies depending on the flow direction. It aims at providing the coupling which can be set.

  In order to achieve the above object, a joint according to the present invention is a joint interposed in a fluid passage through a relay passage provided in a joint main body, from one opening end to the other opening end in the relay passage of the joint main body. The valve component constituting the check valve is disposed between the flanges, and flanges provided at both ends of the outer periphery of the valve component are brought into contact with the inner peripheral surface of the relay passage, respectively. A bypass space communicating with the inside of the valve structure through a throttle hole between the surface and the inner peripheral surface of the relay passage, and one of the valve structures through the throttle hole and the bypass space. The flow path formed between the open end of the first and the other open end is a bypass flow path when the check valve is closed.

  In the joint described above, the present invention is characterized in that the valve component is provided with a filter at one open end and the other open end.

  Further, the present invention is the above-described joint, wherein the valve structure has a main passage portion communicating from one opening end to the other opening end, and a valve seat is provided in the main passage portion. A check valve comprising a spherical valve body that is detachably attached to the valve seat, and the spherical body and the open end facing the valve seat across the valve body A lid member that prevents passage of the fluid while allowing contact with the filter is provided.

  Further, the present invention provides the above-described joint, wherein the joint main body has a housing portion at a position having a diameter larger than that of the relay passage and an axial center aligned with the relay passage, and the valve structure is provided in the housing portion. The filter at the open end facing the valve seat across the valve body is held between the step portion configured between the relay passage and the accommodating portion and the lid member. It is characterized by that.

  Further, in the above-described joint, the present invention forms the throttle hole along the radial direction between the check valve and one opening end in the valve structure, while the check valve and the other opening end. A communication hole is formed along the radial direction between the two.

  In addition, the joint according to the present invention has a relay passage and a housing portion having a diameter larger than that of the relay passage at a position where the axes are aligned with each other, and the joint is interposed in the fluid passage through the relay passage and the housing portion. The main body has flanges at both ends of the outer periphery and a check valve in the main passage that communicates from one open end to the other open end, and each of the flanges contacts the inner peripheral surface of the housing portion. A valve component that forms a bypass space between an outer peripheral surface of the valve component and an inner peripheral surface of the housing portion by being disposed inside the joint body in a contact state; and the valve A filter disposed at one open end and the other open end of the structure, respectively, and the valve structure includes a throttle hole along a radial direction between the check valve and the one open end. The check valve and the other open A communication hole is formed in the radial direction between the end of the valve structure and the first opening end and the other opening end of the valve component through the throttle hole, the bypass space and the communication hole. Is configured as a bypass flow path when the check valve is closed.

  According to the present invention, the bypass structure is provided in which the valve structure constituting the check valve is arranged in the relay passage of the joint body, and communicates with the inside of the valve structure via the throttle hole between the valve structure and the joint body. Therefore, it is possible to set the passage speed of the fluid to be different depending on the flow direction while suppressing a situation in which the outer diameter dimension is remarkably increased.

FIG. 1 is a cross-sectional view showing a main part of a joint according to an embodiment of the present invention. FIG. 2A is a partially broken view of the appearance showing a state in which the check valve is opened in the joint shown in FIG. FIG. 2-2 is a partially broken view of the appearance showing a state in which the check valve is closed in the joint shown in FIG. 1. 3 is an exploded perspective view of the joint shown in FIG. FIG. 4 is a cross-sectional view of an essential part showing an application example of the joint shown in FIG. FIG. 5 is a hydraulic circuit diagram showing an application example of FIG. FIG. 6 is a partially cutaway view of the appearance showing a modification of the joint shown in FIG.

  Hereinafter, preferred embodiments of the joint according to the present invention will be described in detail with reference to the accompanying drawings.

  1 to 3 show a joint which is an embodiment of the present invention. As illustrated in FIG. 5, the joint 10 illustrated here includes a directional control valve 1 that controls supply of oil to a hydraulic actuator (not shown), and a pilot pressure corresponding to the operation direction and operation amount of the operation lever 2. So that the passage speed of the oil varies depending on the direction of oil flow between the pilot operation valve 3 and the pressure chamber 5 of the direction control valve 1. As shown in FIGS. 1 to 3, a joint body 11 is provided.

  As shown in FIGS. 2 and 3, the joint body 11 has a tool operation portion 11a having a hexagonal column shape and a pair of screw portions 11b and 11c protruding from both end faces of the tool operation portion 11a. Each of the screw portions 11b and 11c has a columnar shape and has a thread groove on the outer peripheral surface. The screw operation portions 11b and 11c are integrated with the tool operation portion 11a in a state where the individual shaft centers are aligned with the axis of the tool operation portion 11a. Molded. The joint body 11 has a relay passage 12 in a portion extending from an end surface of one screw portion 11b to an end surface of the other screw portion 11c in the inside thereof, and has a housing portion 13 in one screw portion 11b. ing. The relay passage 12 is a hole having a circular cross section, and is formed on the axial center of the joint body 11 so as to penetrate the joint body 11. The accommodating portion 13 is a circular hole whose cross section is larger than that of the relay passage 12, and is formed at a position where the axis is aligned with the relay passage 12. As shown in FIG. 1, an annular stepped portion 14 is formed inside the accommodating portion 13 between the accommodating passage 13 and the relay passage 12. A first oil filter 20, a valve component 30, a lid member 40, and a second oil filter 50 are disposed in the housing portion 13 of the joint body 11 in that order from the back side.

  As shown in FIG. 3, the first oil filter 20 and the second oil filter 50 are formed to have oil passage holes 22 and 52 by etching the filter bodies 21 and 51 each having a disk shape. Therefore, the outer diameter is formed so that it can be inserted into the accommodating portion 13 and cannot be inserted into the relay passage 12. Note that the passage hole 22 of the first oil filter 20 and the passage hole 52 of the second oil filter 50 are configured to have a very small diameter. In FIG. It is.

  As shown in FIG. 1 to FIG. 3, the valve component 30 has a cylindrical shape having flanges 31 having the same outer diameter at both ends of the outer periphery and a main passage 32 at the center. As shown in FIG. 1, the valve component 30 holds the first oil filter 20 between the step portion 14 of the housing portion 13 and the outer peripheral surface of the flange 31 is fitted to the housing portion 13. It is mounted inside the accommodating portion 13 in the state of being made to be. For the first oil filter 20, the main passage portion 32 is in communication with all the passage holes 22 (see FIG. 3).

  Further, a bypass space 60 is secured between the valve structure 30 and the accommodating portion 13. The bypass space 60 is a cylindrical closed space formed between the outer peripheral surface of the valve component 30, the pair of flanges 31, and the inner peripheral surface of the accommodating portion 13.

  The valve component 30 is configured by forming a ball type check valve 300 between one end face and the other end face in the main passage portion 32. Specifically, the main passage portion 32 is located closer to the opening end side of the accommodating portion 13 than the valve seat 301 (hereinafter referred to as “first passage portion 32 a”) and the main passage portion 32 is accommodated more than the valve seat 301. A valve seat 301 is provided between a portion located in the back of the portion 13 (hereinafter referred to as “second passage portion 32 b”), and a valve body 302 is provided in the first passage portion 32 a of the main passage portion 32. Constitutes the check valve 300. The valve seat 301 protrudes toward the center from the inner peripheral surface of the portion located between the first passage portion 32a and the second passage portion 32b in the main passage portion 32, and has a valve hole 301a in the center portion. is there. A seal surface 301 b is formed on a surface of the valve seat 301 that is located on the opening side of the accommodating portion 13. The seal surface 301b is formed in a taper shape that is gradually inclined toward the back side of the housing portion 13 toward the center portion. The valve body 302 has a spherical shape having an outer diameter larger than that of the valve hole 301 a of the valve seat 301. The valve body 302 is disposed in the first passage portion 32 a of the main passage portion 32, and can be separated from and contacted with the seal surface 301 b of the valve seat 301. As shown in FIGS. 1 and 2-2, when the valve body 302 comes into contact with the seal surface 301b, the valve hole 301a is closed and the main passage portion 32 of the valve component 30 is blocked. . On the other hand, as shown in FIG. 2A, when the valve body 302 is separated from the seal surface 301b, the valve hole 301a is opened and the main passage portion 32 of the valve component 30 is opened. Become.

  The valve structure 30 is formed with a throttle hole 33 and a communication hole 34. The throttle hole 33 is the only opening that communicates between the first passage portion 32a of the valve component 30 and the bypass space 60, and has a smaller diameter than the valve hole 301a. The communication hole 34 is an opening that communicates between the second passage portion 32 b of the main passage portion 32 and the bypass space 60. The communication hole 34 has a larger diameter than the throttle hole 33, and a plurality of communication holes 34 are formed in the valve component 30.

  The lid member 40 has a disk shape having an outer diameter that fits into the accommodating portion 13, and as is apparent from FIGS. 1 to 3, the lid member 40 has a plurality of through holes 41 and a contact cylinder portion 42. doing. The through hole 41 is an opening sufficiently larger than the passage hole 52 of the second oil filter 50, and is provided at a position avoiding the central portion of the lid member 40 so as not to be blocked by the valve body 302. In the present embodiment, as shown in FIG. 3, three through holes 41 having the same size are provided at equal intervals on the circumference around the axis of the lid member 40. The contact cylinder portion 42 has a cylindrical shape with an inner diameter smaller than that of the second oil filter 50, and has a function of securing the filtration chamber 43 between the second oil filter 50. As shown in FIG. 1, the filtration chamber 43 is a space communicating with all the through holes 41 formed in the lid member 40 and all the through holes 52 formed in the second oil filter 50.

  The second oil filter 50 is disposed at a position covering the opening end of the abutting cylinder portion 42 in the lid member 40, and then caulked the entire circumference of the opening end portion of the housing portion 13 in the joint body 11 toward the center side. The caulking portion 11d is attached to the joint body 11.

  FIG. 4 shows a state in which the joint 10 described above is mounted on the directional control valve 1. Since the directional control valve 1 has a symmetrical configuration, only one of them will be described below.

  In the direction control valve 1, a spool 1B is disposed so as to be movable along the axial direction with respect to a valve block 1A. The end of the spool 1B protrudes from the valve block 1A and is accommodated in a pressure chamber 5 formed between the spring case 1C. A spring 1E is interposed between the end of the spool 1B and a spring case 1C via a retainer 1D. The spring 1E is for holding the spool 1B in the neutral position with respect to the valve block 1A. The retainer 1D is in contact with the end portion of the spool 1B so as to be separable, and the end surface of the spool 1B communicates with the pressure chamber 5 through the center hole 1F.

  The joint 10 described above with respect to the directional control valve 1 is mounted by screwing one screw portion 11b accommodating the valve component 30 into the screw hole 1G of the spring case 1C, and the opening end of the accommodating portion 13 is a retainer. It is in a state of communicating with the inside of the pressure chamber 5 at a position facing the 1D center hole 1F. A pilot pressure supply pipe 1 </ b> H is fastened to the other threaded portion 11 c of the joint body 11 in such a manner that the pilot oil passage 4 communicates with the relay passage 12.

  In the directional control valve 1 configured as described above, as shown in FIGS. 4 and 5, when the operation lever 2 is operated, oil is discharged from the pilot operation valve 3 toward the pressure chamber 5 of the directional control valve 1. . When oil is discharged into the pressure chamber 5, this oil acts on the end of the spool 1B, and the spool 1B is switched against the spring force of the left spring 1E in FIG. As shown in FIG. 2A, in the joint 10 interposed in the pilot oil passage 4, oil is supplied from the relay passage 12 to the first oil filter 20 and the second passage portion 32 b of the valve component 30. . When the oil is supplied to the second passage portion 32b, the valve body 302 is separated from the valve seat 301, and the oil supplied to the second passage portion 32b becomes the valve hole 301a, the first passage portion 32a, and the lid member. The pressure chamber 5 is quickly supplied through the 40 through holes 41 and the second oil filter 50. Thereby, when the operation lever 2 is operated quickly, the spool 1B of the direction control valve 1 can be quickly switched, and a hydraulic actuator (not shown) can be operated following the operation of the operation lever 2. become able to. In addition, when the valve body 302 is separated from the valve seat 301, the lid member 40 is interposed between the first oil filter 20 and the center portion thereof is covered. The valve body 302 does not contact the first oil filter 20 and cause damage.

  On the other hand, when the operation lever 2 is returned to the neutral position from the above state, the spool 1B is returned to the neutral position by the spring force of the left spring 1E in FIG. 4 will be discharged. In this case, as shown in FIG. 2B, the oil in the pressure chamber 5 flows through the second oil filter 50 and the first through hole 41 of the lid member 40 along with the return movement of the spool 1B. Oil is supplied to the passage portion 32a. When oil is supplied to the first passage portion 32a, the valve body 302 is maintained in contact with the seal surface 301b of the valve seat 301 by the pressure, and the valve hole 301a is closed. For this reason, as shown by the arrow in FIG. 2B, the oil supplied from the pressure chamber 5 reaches the bypass space 60 from the first passage portion 32a through the throttle hole 33, and further from the bypass space 60 to the communication hole. 34 is supplied to the second passage portion 32 b through the first oil filter 20 and finally reaches the relay passage 12 through the first oil filter 20. That is, the oil supplied from the pressure chamber 5 is supplied to the relay passage 12 through the throttle hole 33 having a diameter smaller than that of the valve hole 301 a formed in the valve seat 301, and the pilot operation valve 3 through the pilot oil passage 4. Will be returned. As a result, the speed at which the spool 1B of the directional control valve 1 returns to the neutral position is reduced, and the flow of oil to the hydraulic actuator is not suddenly cut off, so that the situation where the hydraulic actuator operates shockfully is prevented. Will be able to.

  Thus, according to the joint 10, the oil passage speed can be set differently when oil is supplied to the pressure chamber 5 and when oil is discharged from the pressure chamber 5. Moreover, it is only necessary to accommodate the valve component 30 in the accommodating portion 13 with respect to the joint main body 11, and it is not necessary to add a new part to the outer peripheral portion of the joint main body 11. Therefore, it is possible to suppress a situation in which the outer diameter dimension is remarkably increased.

  In addition, since the cylindrical member having both ends of the same maximum outer shape is applied as the valve component 30, the direction of the valve component 30 is reversed with respect to the accommodating portion 13 including the lid member 40. If accommodated, the passage speed of the fluid can be set in reverse, which is extremely advantageous in terms of usability.

  In the above-described embodiment, the joint 10 interposed in the pilot oil passage 4 that supplies oil to the pressure in the directional control valve 1 that performs oil supply control to the hydraulic actuator (not shown) is illustrated. However, the application site is not limited to this, and can be applied to other uses as long as the passage speed needs to be set differently depending on the flow direction of the fluid.

  Moreover, in embodiment mentioned above, although the joint 10 whose both ends became the external threads 11b and 11c is illustrated, about the edge part which does not form the accommodating part 13 in the joint main body 11, it is a modification of FIG. As shown in the joint 100, the joint body 111 can be configured to have a female screw 111 b. In addition, in the modification of FIG. 6, about the structure similar to embodiment, the same code | symbol is attached | subjected and each detailed description is abbreviate | omitted.

4 Pilot oil passage 10 Joint 11 Joint body 12 Relay passage 13 Housing portion 14 Step portion 20 First oil filter 30 Valve component 31 Flange 32 Main passage portion 32a First passage portion 32b Second passage portion 33 Restriction hole 34 Communication hole 40 Lid member 41 Through hole 42 Abutting tube portion 43 Filtration chamber 50 Second oil filter 60 Bypass space 100 Joint 111 Joint body 300 Check valve 301 Valve seat 301a Valve hole 301b Seal surface 302 Valve body

In order to achieve the above object, a joint according to the present invention is a joint interposed in a fluid passage through a relay passage provided in a joint main body, from one opening end to the other opening end in the relay passage of the joint main body. The valve component constituting the check valve is disposed between the flanges, and flanges provided at both ends of the outer periphery of the valve component are brought into contact with the inner peripheral surface of the relay passage, respectively. A bypass space is formed between the surface and the inner peripheral surface of the relay passage , and further , the bypass space and the valve structure of the valve structure are formed through a communication hole formed along the radial direction of the valve structure. While communicating with one opening end, it communicates between the bypass space and the other opening end of the valve component through a throttle hole provided in the valve component, the throttle hole, Through the bypass space and the communication hole A flow path formed between one open end and the other open end of the valve structure is a bypass flow path when the check valve is closed, and further, one open end of the valve structure And the filter is arrange | positioned in the opening edge part of the other side, It is characterized by the above-mentioned.

Claims (6)

In the joint interposed in the fluid passage through the relay passage provided in the joint body,
The relay body of the joint body is provided with a valve structure that constitutes a check valve between one opening end and the other opening end, and flanges provided at both ends of the outer periphery of the valve structure are respectively By making contact with the inner peripheral surface of the relay passage, a bypass space is formed between the outer peripheral surface of the valve component and the inner peripheral surface of the relay passage via the throttle hole. The flow path formed between one open end and the other open end of the valve structure through the throttle hole and the bypass space is a bypass flow path when the check valve is closed. A joint characterized by that.   2. The joint according to claim 1, wherein a filter is provided at each of the opening end and the other opening end of the valve structure. The valve structure has a main passage portion communicating from one opening end to the other opening end, and a valve seat is provided in the main passage portion, and is arranged so as to be detachable from the valve seat. A check valve comprising a spherical valve body provided,
The opening end facing the valve seat with the valve body interposed therebetween is provided with a lid member that prevents the contact between the spherical body and the filter while allowing fluid to pass therethrough. Fittings. The joint body has a housing portion at a position that is thicker than the relay passage and has an axial center that matches the relay passage, and a valve structure is disposed in the housing portion.
4. The filter at the open end facing the valve seat with the valve body interposed therebetween is held between a step portion formed between the relay passage and the accommodating portion and the lid member. Fittings described in   In the valve structure, the throttle hole is formed in the radial direction between the check valve and one opening end, and the communication hole is formed in the radial direction between the check valve and the other opening end. The joint according to claim 1, wherein the joint is formed. A joint body that has a relay passage and a housing portion having a diameter larger than that of the relay passage at a position where the axes are aligned with each other, and is interposed in the fluid passage through the relay passage and the housing portion;
A flange is provided at both ends of the outer periphery, and a check valve is provided in a main passage portion communicating from one opening end to the other opening end, and the flanges are brought into contact with the inner peripheral surface of the housing portion, respectively. A valve component that forms a bypass space between the outer peripheral surface of the valve component and the inner peripheral surface of the housing portion by being disposed inside the joint body in a state;
And a filter disposed at one open end and the other open end of the valve structure, respectively, and the valve structure includes a radial space between the check valve and the one open end. A throttle hole is formed, and a communication hole is formed along the radial direction between the check valve and the other opening end, and one opening of the valve component is formed through the throttle hole, the bypass space, and the communication hole. A joint characterized in that a flow path communicating between one end and the other open end is configured as a bypass flow path when the check valve is closed.

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