JP6007433B2 - Compound valve - Google Patents

Description

  The present invention relates to a composite valve, and more particularly to a composite valve in which an unload valve and a relief valve that are mainly used in industrial vehicles and construction machinery are integrated.

  In industrial vehicles such as forklifts and construction machinery, a relief valve is used to open the valve when the oil pressure in the upstream oil passage exceeds a predetermined value for some reason and to reduce the pressure in the upstream oil passage. It is common that it is provided. The technique disclosed in JP-A-2002-130204 is an example of such a relief valve. In addition, when the hydraulic pressure in the circuit reaches a predetermined value, an unload valve is also provided to return the oil discharged from the pump to the tank while maintaining the pressure and to operate the pump without load. There are many. The technique disclosed in Japanese Patent Laid-Open No. 11-315805 is an example of such an unload valve. The valves disclosed in these publications will be described below.

  FIG. 7 is a cross-sectional view showing the structure of a relief valve according to the prior art. In FIG. 7, 85 is a relief valve, 86 is a valve casing, 87 is a first supply / discharge passage, 88 is a tank conduit, 89 is a second supply / discharge passage, 90 is a valve assembly, 91 is an accumulator, and 92 is A valve spring, 93 is an oil hole, 94 is a valve seat member, 95 is a valve body, 96 is a guide sleeve, 97 is a valve body, and 98 is a valve seat member.

  As shown in FIG. 7, the relief valve 85 includes a casing 86, a guide sleeve 96, valve bodies 95 and 97, a valve spring 92, an accumulator 91, and the like. The first supply / discharge passage 87 and the second supply / discharge passage 89 supply and discharge pressure oil from the hydraulic pump to the tank conduit 88 side, and the valve assembly 90 is interposed between these passages. Is provided. The valve assembly 90 is an assembly including a guide sleeve 96, valve seat members 94 and 98, valve bodies 95 and 97, a valve spring 92, a guide sleeve 96, and the like. The valve seat members 94 and 98 are fitted and attached to both end sides of the guide sleeve 96. The valve bodies 95 and 97 are provided in the guide sleeve 96, and are poppet valve bodies having the same shape, and are slidably provided in the guide sleeve 96. The valve spring 92 constantly urges the valve body 95 and the valve body 97 at both ends toward the valve seat member 94 and the valve seat member 98, respectively. The spring chamber provided with the valve spring 92 communicates with the first supply / discharge passage 87 and the second supply / discharge passage 89 through an oil hole 93. The accumulator 91 is located between the valve body 95 and the valve body 97, and causes the valve bodies 95 and 97 to be low-pressure relief with a pressure lower than the relief set pressure of the valve spring 92. With the above configuration, the accumulator 91 temporarily relieves the valve bodies 95 and 97 at a pressure lower than the relief set pressure of the valve spring 92, thereby reducing the impact when the relief valve is opened.

  Moreover, FIG. 8 is sectional drawing which shows the structure of the unloading valve based on a prior art. In FIG. 8, 100 is an unloading valve, 101 is a main valve, 102 is a spool, 103 is a spring chamber, 104 is a first small diameter part, 105 is a large diameter part, 106 is a second small diameter part, 107 is a left end face, 108 Is a adjusting screw, 109 is a slider, 110 is a spring, 111 is a spring receiver, 112 is a valve body, 113 is a control pressure introduction port, 114 is a sleeve, 115 is a load pressure introduction port, 116 is a tank port, 117 is an outlet Port 118 is a first inlet port, 119 is an electromagnetic proportional pressure control valve, and 120 is a solenoid.

  As shown in FIG. 8, in the unload valve 100, a slider 109 is slidably inserted into the left part of the valve body 112 of the main valve 101, and the sleeve 114 is placed on the right side of the valve body 112. One end is inserted. In the slider 109, the adjustment screw 108 is in contact with the left end portion of the valve main body 112. The spool 102 has a first small diameter portion 104, a large diameter portion 105, and a second small diameter portion 106. The first small diameter portion 104 has a left end portion slidably inserted into the slider 109. The large diameter portion 105 is slidably inserted into the large diameter hole of the sleeve 114. The second small diameter portion 106 is slidably inserted into the small diameter hole of the sleeve 114. Note that the right end surface 107 of the spool 102 forms a pressure receiving portion. The spool 102 is set so that the cross-sectional area of the second small diameter portion 106 is a size obtained by dividing the cross-sectional area of the first small diameter portion 104 from the cross-sectional area of the large diameter portion 105. The sleeve 114 forms a first inlet port 118 with its right end opened, and forms an outlet port 117 at a portion located slightly to the left of the right end opening. The outlet port 117 communicates with the tank port 116 of the operation valve. In addition, the sleeve 114 includes a load pressure introduction port 115 for introducing pressure oil at the maximum load pressure, and a control pressure introduction port 113 for introducing control pressure from the electromagnetic proportional pressure control valve 119 including the solenoid 120. A spring 110 is provided in the spring chamber 103. The spring 110 is interposed between the spring receiver 111 inserted into the first small diameter portion 104 of the spool 102 and the right end surface of the slider 109 and pushes the spool 102 to the right. With the above configuration, the main valve 101 changes the balance of the operating force of the pressure receiving portion at the end of the spool 102 by the control pressure from the electromagnetic proportional pressure control valve 119.

  As described above, the relief valve and the unload valve are valves that need to operate in accordance with individual set pressures. Although it is technically possible to integrate them in order to reduce the size, it is difficult to arrange the relief valve pressure setting mechanism and the unload valve solenoid so as not to interfere with each other. Even if integrated, it was very difficult to reduce the size.

JP 2002-130204 A Japanese Patent Laid-Open No. 11-315805

  In order to solve the above problems, the present invention provides a composite valve having a structure that can be easily miniaturized in a composite valve in which an unload valve and a relief valve, which are mainly used in industrial vehicles and construction machinery, are integrated. For the purpose.

  The invention according to claim 1 is formed in a substantially columnar shape, and has a communication passage structure in which first and second communication passages are formed to communicate the upstream oil passage and the downstream oil passage by perforating the inside. A first valve body provided to open the downstream oil passage side opening of the first communication passage by sliding along a central axis of the member, and the communication passage. A second valve body provided in such a manner that the opening on the downstream oil passage side of the second communication passage can be opened by sliding along the central axis of the component member, a coil, and a portion provided in the vicinity of the coil. The fixed magnetic pole and a movable magnetic pole attracted to the fixed magnetic pole when energized to the coil, and the movable magnetic pole is directly or indirectly connected to the first valve body, The first valve element is placed in the center of the communication path component when the coil is energized. A solenoid that slides along the second valve body, and a second end of the second valve body that is brought into contact with the second valve body by an elastic force, on the downstream oil passage side of the second communication path. When the hydraulic pressure in the second communication passage is pressed toward the opening and the hydraulic pressure in the second communication passage exceeds a predetermined value, the second valve element overcomes the elastic force and the downstream oil in the second communication passage. And a spring provided to slide away from the opening on the road side along the central axis of the communication path component.

  According to a second aspect of the present invention, in the first aspect of the invention, the communication path component member has an opening on the upstream oil passage side of the first communication path formed on a first end surface, and an outer peripheral surface. The opening on the downstream oil passage side of the first communication path is opened, the first valve body is formed in a substantially cylindrical shape, and at least the first of the communication path constituting member in the hollow part. The composite valve is characterized in that the opening on the downstream oil passage side of the communication passage and the vicinity thereof are arranged.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the communication path constituting member is formed with an opening on the upstream oil path side of the second communication path on the first end surface. The composite valve is characterized in that the opening on the downstream oil passage side of the second communication passage is formed on the second end face.

  According to a fourth aspect of the present invention, in the invention of the third aspect, the communication path constituting member includes the opening on the upstream oil passage side of the first communication path and the upstream side of the second communication path. The composite valve is characterized in that the opening on the oil passage side is common to each other.

  According to a fifth aspect of the invention, in the first aspect of the invention according to any one of the second to fourth aspects, the first valve body has a first opening on an outer peripheral surface and the first valve body. The first opening overlaps with the opening on the downstream oil passage side of the first communication passage of the communication passage constituting member when the coil is energized, and the first communication passage and the downstream oil passage communicate with each other. This is a composite valve characterized by being configured as described above.

  According to a sixth aspect of the invention, in the first aspect of the invention according to any one of the third to fifth aspects, the first valve body has a second opening on the outer peripheral surface and the first valve body. When the second valve body is separated from the opening on the downstream oil passage side of the second communication passage, the second opening communicates the second communication passage and the downstream oil passage. It is a composite valve characterized by being arranged.

  The invention according to claim 7 is the invention according to any one of claims 3 to 6, and is further formed in a substantially cylindrical shape, and the first end is the first valve body. And the second end of the first shaft is in contact with the movable magnetic pole of the solenoid, and the second valve body and the spring are partially in the hollow portion of the first shaft. It is the composite valve characterized by being arrange | positioned.

  The invention according to claim 8 is the invention according to claim 7, wherein the movable magnetic pole is formed in a substantially cylindrical shape, and further, at least a part of the movable magnetic pole is disposed in the hollow portion of the movable magnetic pole. The composite valve has a second shaft that abuts against the second end of the spring, and the second end abuts against the pressure adjusting screw.

  According to the first aspect of the present invention, the two communication paths are provided in the communication path constituting member, the first valve body that slides by the movable magnetic pole of the solenoid, and the second valve that is pressed by the spring force of the spring. Since the valve body slides along the central axis of the communication path component with respect to the communication path component, each of the two communication paths is opened and closed. Since the sliding directions of the two valves are the same, it is easy to reduce the size of the entire composite valve.

  According to the second aspect of the present invention, the opening on the downstream oil passage side of the first communication passage opens on the outer peripheral surface, the first valve body is formed in a substantially cylindrical shape, and the first valve body Since the opening on the downstream oil passage side of the first communication passage and the vicinity thereof are arranged in the hollow portion of the first communication passage, the communication passage constituting member and the first valve body can be arranged in a nested manner, and the composite valve It becomes very easy to reduce the size.

  According to the third aspect of the present invention, the upstream oil passage side opening of the second communication passage is formed in the first end face of the communication passage constituting member, and the downstream oil of the first communication passage is formed in the second end face. Since the road-side opening is formed, the second valve element can be disposed so as to face the second end face of the communication path constituting member. As a result, since the center axis of the second valve body and the center axis of the communication path constituting member can be made to coincide with each other, it is very easy to downsize the composite valve.

  According to the fourth aspect of the present invention, since the opening on the upstream oil passage side of the two communication passages is made common to each other, it is possible to reduce the size of the communication passage constituting member, and thus the overall size of the composite valve. It becomes easy.

  According to the fifth aspect of the present invention, the first opening of the first valve body overlaps with the opening on the downstream oil passage side of the first communication passage of the communication passage constituting member, and the first communication passage and the downstream. Since the oil passage is communicated, the opening and closing of the first communication passage can be realized with a simple structure, and as a result, the entire composite valve can be easily downsized. Furthermore, it becomes easy to reduce leakage in the closed state.

  According to the sixth aspect of the present invention, when the second valve body is separated from the second oil passage side opening of the second communication path, the second valve body is separated from the second valve body. Since the second valve body is in an open state, the first valve body communicates with the second communication path and the downstream oil passage. Will not be disturbed. As a result, it is not necessary to separately provide a communication path between the second communication path and the downstream oil path, which contributes to downsizing of the composite valve.

  According to the seventh aspect of the present invention, the first shaft is formed in a substantially cylindrical shape, and the second valve body and a part of the spring are disposed in the hollow portion of the first shaft. Miniaturization becomes very easy.

  According to the invention described in claim 8, since the movable magnetic pole is formed in a substantially cylindrical shape and a part of the second shaft is disposed in the hollow portion of the movable magnetic pole, it is very easy to downsize the composite valve. become.

It is sectional drawing which shows the composite valve concerning the 1st Embodiment of this invention, (a) is the state which has not energized the solenoid, (b) shows the state which has energized the solenoid. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially enlarged cross-sectional view (1) of a first valve body and a second valve body of a composite valve according to a first embodiment of the present invention, and peripheral portions thereof, (a) energizing a solenoid. (B) shows a state where the solenoid is energized. FIG. 2 is a partially enlarged cross-sectional view (2) of the first valve body and the second valve body of the composite valve according to the first embodiment of the present invention, and their peripheral parts, in which (a) energizes the solenoid. First, the state in which the second valve body is open, (b) shows the state in which the solenoid is energized and the second valve body is open. It is a figure which shows the communicating path structural member which concerns on the 1st Embodiment of this invention, (a) is a top view, (b) is a right view, (c) is sectional drawing. It is a figure which shows the valve body which concerns on the 1st Embodiment of this invention, (a) is a top view of a 1st valve body, (b) is sectional drawing of a 1st valve body, (c) is a 2nd valve It is a front view of a body. It is a partial expanded sectional view of the 1st valve body and 2nd valve body of a compound valve concerning a 2nd embodiment, and these peripheral parts, and (a) is a state which has not energized a solenoid, (b ) Indicates a state in which the solenoid is energized. It is sectional drawing which shows the structure of the relief valve which concerns on a prior art. It is sectional drawing which shows the structure of the unloading valve which concerns on a prior art.

  The composite valve according to the first embodiment of the present invention will be described. 1A and 1B are cross-sectional views showing a composite valve according to a first embodiment of the present invention, in which FIG. 1A shows a state in which the solenoid is not energized, and FIG. 1B shows a state in which the solenoid is energized. In FIG. 1, 10 is a composite valve, 11 is a communication passage component, 12 is a solenoid component, 20 is a first valve body, 23, 24, 25 and 26 are openings, 30 is a second valve body, and 32 is a flange. , 33 is a tip portion, 35 is a communication path component, 38 is an upstream communication path, 39 and 40 are downstream first communication paths, 42 is a downstream second communication path, 44 is a spring, and 45 is a communication path support. Member, 46 is a flange part, 47 is a main body part, 48 is a fixed magnetic pole part, 48a is a thin part, 49 is an inclined surface, 50 and 51 are openings, 53 is an annular communication path, 55 is a spring, 56 is a shaft, 57 Is a storage space, 58 is a shaft, 59 is a clearance space, 60 is a movable magnetic pole, 61 is a through hole, 62 is an inclined surface, 63 is a clearance space, 64 is an annular connecting member, 65 is a case, 66 is a thin portion, 67 is Thin part, 68 is bobbin, 69 Coil, 70 and 71 are lids, 72 is a solenoid structural member, 73 is a protruding portion, 74 is a screwed member holding portion, 75 is a movable magnetic pole holding portion, 76 is a thin portion, 77 is a pressure adjusting space, 78 is a screwed member, 79 Is a fixing member, 80 is a screw, 81 is an O-ring, and 82 is a relief space.

  In the following description, the upstream oil passage indicates an oil passage to which the pressure of oil discharged from the pump is applied, and the downstream oil passage indicates an oil passage to which a tank to which oil returns is connected. Note that the upstream oil passage and the downstream oil passage are not particularly illustrated because it is possible to use hydraulic circuit pipelines according to the related art. In addition, the composite valve 10 according to each embodiment of the present invention is a composite valve in which the two valve bodies of the relief valve and the unload valve operate independently, but serves as a port to an external pipeline. The upstream communication passage 38 and the openings 50 and 51 are common to these two valves.

  First, an outline of the composite valve 10 according to the first embodiment of the present invention will be described. The composite valve 10 is mainly used for industrial vehicles such as forklifts and construction machines, but of course, it can be used for other devices that require both a relief valve and an unload valve. As shown in FIG. 1, the composite valve 10 includes a relief valve and unload valve valve body, a communication path component portion 11 including a communication path between an upstream oil path and a downstream oil path, and a relief valve valve. It consists of a solenoid that slides the body and a solenoid component 12 that is composed of a spring that presses the valve body of the unload valve with a predetermined pressure. The composite valve 10 has a substantially cylindrical appearance as a whole, and has a simpler shape than a conventional composite valve, which often has a complicated appearance such as a combination of a plurality of cylindrical shapes, and is incorporated in a hydraulic circuit. It can be said that it is easy. FIG. 1A shows a state where the coil 69 is not energized and the movable magnetic pole 60 is not attracted to the fixed magnetic pole portion 48 of the communication path support member 45. The first valve body 20, which is the valve body of the unload valve, has a part of the communication path constituting member 35 inserted into the hollow portion, and has a nested structure with respect to the communication path constituting member 35.

  The communication passage constituting member 35 communicates an upstream oil passage (not shown) and an annular communication passage 53 communicating with a downstream oil passage (not shown) through the openings 50 and 51. That is, the communication path constituting member 35 is formed by perforating the inside thereof, so that the upstream communication path 38 facing the upstream oil path, the downstream first communication paths 39 and 40 continuing to the upstream communication path 38, and the downstream side A second communication passage 42 is formed, and the downstream first communication passages 39 and 40 and the downstream second communication passage 42 are provided in the annular communication passage 53 so as to be openable. However, in the state shown in FIG. 1A, the first valve body 20 is pressed against the flange portion 46 of the communication path support member 45 by the elastic force of the spring 44, and the downstream side first communication paths 39 and 40. Is closed by the first valve body 20. FIG. 1B shows a state where the movable magnetic pole 60 is attracted to the fixed magnetic pole portion 48 by energizing the coil 69. When the movable magnetic pole 60 is attracted to the fixed magnetic pole portion 48, the movable magnetic pole 60 slides the shaft 56, and the shaft 56 overcomes the elastic force of the spring 44 and slides the first valve body 20 toward the spring 44. It is moving. In this state, the downstream first communication passages 39 and 40 are opened to the annular communication passage 53 via the openings 23 and 24 of the first valve body 20, and the upstream oil passage and the downstream oil passage communicate with each other. Become. When the upstream oil passage communicates with the downstream oil passage, although not particularly illustrated, the pump is operated with no load while maintaining the pressure of the upstream oil passage at a substantially predetermined value, that is, the oil discharged from the pump is directly on the downstream oil passage side. Return to the tank.

  The second valve body 30 is constantly pressed against the opening of the downstream second communication passage 42 by the spring 55. When the pressure in the upstream oil passage becomes a predetermined value or more, the second valve body 30 is released from the downstream second communication passage 42. Due to the applied hydraulic pressure, the second valve body 30 is separated from the opening portion of the downstream second communication passage 42, and the opening portion of the downstream second communication passage 42 is connected to the annular communication passage through the openings 25 and 26 of the first valve body 20. 53. Accordingly, the pressure in the upstream oil passage is released to the downstream oil passage, and the pressure in the upstream oil passage is reduced to a value less than a predetermined value. As will be described later, the second valve body 30 is configured to operate completely independently from the first valve body 20 regardless of whether the coil 69 is energized or not energized.

  Further, the shape and the like of each component will be described in detail. 4A and 4B are views showing the communication path constituting member according to the first embodiment of the present invention, where FIG. 4A is a plan view, FIG. 4B is a right side view, and FIG. 4C is a cross-sectional view. 4, 36 is a flange portion, 36a is an end surface portion, 37 is a main body portion, 37a is an end surface portion, 41 is a connection passage, 43 is a seat surface, and other reference numerals are the same as those in FIG. 5 is a view showing the valve body according to the first embodiment of the present invention, where (a) is a plan view of the first valve body, (b) is a cross-sectional view of the first valve body, c) is a front view of the second valve body. In FIG. 5, 21 is a body portion, 22 is a hollow portion, 27 is a flange portion, 28 is an outer peripheral surface, 29 is an inner peripheral surface, 29a is an inner peripheral groove, 31 is a main body portion, 34 is a conical surface, etc. The reference numeral indicates the same as in FIG.

  As shown in FIGS. 4A and 4B, the communication path constituting member 35 has an outer shape in which a flange portion 36 is provided at an end portion of a main body portion 37 formed in a substantially cylindrical shape. Further, as shown in FIG. 4C, an upstream communication path 38 extending from the center of the end surface portion 36 a of the flange portion 36 along the central axis of the main body portion 37 is formed, and further from the upstream communication path 38. The connection passage 41 and the downstream second communication passage 42 are formed in this order so as to extend continuously. The downstream second communication passage 42 opens to the end surface portion 37a of the main body portion 37 that is the end surface opposite to the end surface portion 36a, and has a diameter larger than that of the upstream communication passage 38 due to the pressure setting of the relief valve. A little big. Further, the periphery of the opening of the downstream second communication passage 42 is a seat surface 43. The seat surface 43 serves as a valve seat for the second valve body 30 and is formed as an annular inclined surface in accordance with the shape of the second valve body 30. In addition, although the edge part of the main-body part 37 and the flange part 36 in this embodiment is each made into the flat end surface parts 36a and 37a, you may change suitably according to the structure of the composite valve 10, etc. The other external shapes can be changed as appropriate as long as the first valve body 20 and the second valve body 30 can operate independently of each other.

  Further, downstream first communication passages 39 and 40 are connected in the vicinity of the end of the upstream communication passage 38. The downstream first communication passage 39 and the downstream first communication passage 40 extend in the vertical direction from the vicinity of the end of the upstream communication passage 38 and open to the upper and lower portions of the outer peripheral surface of the main body portion 37. ing. The openings of the downstream first communication passages 39 and 40 face the inner peripheral surface of the first valve body 20, but, as described above, overlap with the openings 23 and 24 of the first valve body 20, Opened to the annular communication path 53. The downstream first communication passages 39 and 40 and the downstream second communication passage 42 are connected to the upstream oil passage via the upstream communication passage 38, but are connected to each other inside the communication passage constituting member 35. The communication path which opens independently in the end surface part 36a independently may be formed, and you may connect to an upstream oil path separately, respectively. Furthermore, only the opening facing the upstream oil passage may be shared, and a communication path that is separated inside the communication path constituting member 35 may be formed. In other words, the communication path inside the communication path constituting member 35 can be changed as appropriate as long as one of the openings faces the first valve body 20 and the second valve body 30 separately. It is.

  As shown in FIGS. 5A and 5B, the first valve body 20 is formed in a substantially cylindrical shape in the main body portion 21, and the hollow portions 22 are open at both ends. Further, the outer peripheral surface 28 of the main body 21 faces the annular communication path 53, and the inner peripheral surface 29 of the main body 21 faces the outer peripheral surface 28 of the main body 37 of the communication path constituting member 35. Further, the main body portion 21 is provided with a flange portion 27 that goes around the outer peripheral surface 28 in the middle in the central axis direction of the main body portion 21. The flange portion 27 receives the elastic force of the spring 44 by always abutting against one end portion of the spring 44 shown in FIG. In addition, except the part which provided the flange part 27 of the main-body part 21, it forms in uniform thickness. In addition, openings 23 and 24 are opened near the flange portion 27 of the outer peripheral surface 28. The opening 23 and the opening 24 are respectively opened at portions of the outer peripheral surface 28 facing away from each other. As described above, the opening 23 and the opening 24 overlap the downstream first communication path 39 and the downstream first communication path 40 of the communication path constituting member 35, respectively, thereby downstream of the communication path constituting member 35. The side first communication passage 39 and the downstream first communication passage 40 are opened to the annular communication passage 53. Further, the openings 23 and 24 are formed in portions away from both end portions of the main body portion 21 to reduce oil leakage when the coil 69 is not energized.

  The inner peripheral surface 29 is formed with an inner peripheral groove 29 a that is orthogonal to the central axis and extends over the entire circumference of the inner peripheral surface 29. The width of the inner peripheral groove 29a is larger than the diameter of the openings 23 and 24, and the inner peripheral surface 29 side of the openings 23 and 24 opens into the inner peripheral groove 29a. Therefore, even if the downstream first communication passages 39 and 40 slightly deviate in the stop position of the first valve body 20 when the coil 69 is energized, the downstream first communication passages 39 and 40 and the inner periphery of the first valve body 20 are prevented. The annular communication path 53 is reliably communicated with the groove 29a. Even if the first valve body 20 is mounted in a state of being displaced in the circumferential direction, the downstream first communication passages 39 and 40 are open to the inner circumferential groove 29a. The first communication passages 39 and 40 communicate with the annular communication passage 53 through the openings 23 and 24 from the inner circumferential groove 29a. In addition, openings 25 and 26 are opened near the end of the main body 21 on the second valve body 30 side. The opening 25 and the opening 26 are for sending the oil flowing out from the opening of the downstream second communication passage 42 to the annular communication passage 53 during the operation of the second valve body 30 as described above. . Note that the openings 23 and 24 and the openings 25 and 26 are each formed as a set, but an opening is further formed according to the required oil flow rate, and a set of three, 4 A single set may be used. Conversely, only the opening 23 and the opening 25 may be formed. Further, the first valve body 20 may be formed in a semi-cylindrical shape obtained by, for example, dividing bamboo in the axial direction as long as it can open and close the downstream first communication path.

  As shown in FIG. 5 (c), the second valve body 30 is provided with a tip portion 33 formed in a shape corresponding to the valve body in a substantially rod-shaped main body portion 31, and a flange portion 32 therebetween. Is provided. The main body 31 is inserted into the escape space 59 of the shaft 58 shown in FIG. 1 at the front end side, and is guided by the escape space 59 when the second valve body 30 slides. The flange portion 32 receives the elastic force of the spring 55 by always contacting the one end portion of the spring 55 shown in FIG. The peripheral side surface of the distal end portion 33 is formed as a conical surface 34 having an inclination angle corresponding to the seat surface 43 of the communication path constituting member 35. In addition, the 2nd valve body 30 forms the peripheral side surface of the front-end | tip part 33 in a substantially hemispherical shape according to the flow volume and pressure of required oil, or forms the flange part 32 in the site | part closer to a front-end | tip. Etc. can be changed.

  The description will be continued with reference to FIGS. FIG. 2 is a partially enlarged cross-sectional view (1) of the first valve body and the second valve body of the composite valve according to the first embodiment of the present invention, and their peripheral parts, (a) A state where the solenoid is not energized, (b) shows a state where the solenoid is energized. In FIG. 2, 47a is a thick part, 52 is a relief space, 54 is a storage space, and other symbols are the same as those in FIG.

  The communication path support member 45 is a member that supports each member constituting the communication path and constitutes a part of the communication path. As shown in FIG. 2A, the main body 47 of the communication path support member 45 is formed in a substantially cylindrical shape, and a thick portion 47a having a larger thickness than the peripheral portion is formed in the vicinity of the tip portion in an annular shape. doing. The flange portion 27 of the communication path constituting member 35 is fitted on the tip side of the thick portion 47a. Therefore, the thick portion 47a plays a role of defining the press-fitting depth in the step of press-fitting the communication path constituting member 35. The main body 47 houses the communication path support member 45, the first valve body 20 and the spring 44, and the second valve body 30 and a part of the spring 55 therein. As described above, the gap between the main body 47 and the first valve body 20 serves as the annular communication passage 53 that connects the communication passage formed in the communication passage constituting member 35 and the downstream oil passage. In addition, openings 50 and 51 are formed above and below the main body 47 in order to send oil from the annular communication passage 53 to the downstream oil passage. Note that the number of openings can be appropriately changed according to the required oil flow rate, such as forming only one opening, or forming three or more openings. In addition, a region in the vicinity of the flange portion 36 of the annular communication path 53 becomes a relief space 52 in which the first valve body 20 that has slid when the coil 69 is energized is accommodated. Further, the gap between the second valve body 30 and the first valve body 20 serves as a storage space 54 for storing the spring 55 and ensuring the mobility of the second valve body 30. Since the storage space 54 communicates with the annular communication passage 53 via the openings 25 and 26 of the first valve body 20, there is no pressure difference with the annular communication passage 53.

  Further, as shown in FIGS. 1A and 1B, the communication path support member 45 includes a flange portion 46 and a fixed magnetic pole portion 48 formed in this order in succession to the main body portion 47. The flange portion 46 plays a role of defining the press-fitting depth in the step of press-fitting the lid 70 into the fixed magnetic pole portion 48. When the coil 69 is energized, the fixed magnetic pole portion 48 forms a magnetic circuit together with the lid 70, the case 65, the lid 71, the solenoid structure member 72, and the movable magnetic pole 60 to attract the movable magnetic pole 60. In addition, the fixed magnetic pole portion 48 is formed with a thin portion 48 a surrounding the movable magnetic pole 60 at the tip portion and further opposed to the movable magnetic pole 60 in order to suppress a sudden increase in attractive force with respect to the movable magnetic pole 60 when the coil 69 is energized. The surface is an inclined surface 49. As shown in FIG. 2A, one end of the spring 44 abuts on the flange portion 36 of the communication path constituting member 35, the other end abuts on the flange portion 27 of the first valve body 20, and is compressed. The flange portion 27 is constantly pressed toward the shaft 56 side.

  As shown in FIGS. 1A and 1B, the spring 55 is in a state where one end is in contact with the flange portion 32 of the second valve body 30 and the other end is in contact with the shaft 58 and is compressed. The flange portion 32 is constantly pressed toward the communication path constituting member 35 side. The shaft 56 is formed in a substantially cylindrical shape, and further has one end in contact with the first valve body 20 and the other end in contact with the movable magnetic pole 60. When the coil 69 is energized, the first valve body 20 is pressed toward the spring 55 as the movable magnetic pole 60 is attracted to the fixed magnetic pole portion 48. A storage space 57 that is a hollow portion of the shaft 56 stores a part of the second valve body 30 and the spring 55 and serves as an oil passage to the movable magnetic pole 60 side. The shaft 58 is formed in a substantially bar shape, and is inserted into the hollow portion of the movable magnetic pole 60 in a slidable state. In addition, the shaft 58 is provided with a clearance space 59 that is a hole for guiding the sliding of the distal end side of the second valve body 30 on the second valve body 30 side. Further, the periphery of the opening of the escape space 59 is in contact with the spring 55. In addition, a concave portion is formed at the tip portion opposite to the escape space 59, and the concave portion and the peripheral portion of the concave portion are in contact with the tip portion of the screw-in member 78.

  The movable magnetic pole 60 has a through hole formed along the central axis, and the shaft 58 is inserted into the through hole as described above. The surface facing the fixed magnetic pole portion 48 is formed as an inclined surface 62 inclined at the same angle as the inclined surface 49 of the fixed magnetic pole portion 48. In addition, by forming the through-hole 61 in parallel with the through-hole into which the shaft 58 is inserted, the pressure difference between the escape space 63 and the pressure adjustment space 77, which is a gap between the movable magnetic pole 60 and the fixed magnetic pole portion 48, is reduced. I try to relax. The case 65 houses the bobbin 68 and the like and constitutes a part of the magnetic circuit. In addition, the case 65 is formed in a substantially cylindrical shape, and in order to fit the lid 70 and the lid 71 in the opening, a thin portion 66 and a thin portion 67 are formed that are thinner than the portion near the center. ing. The lid 71 is fitted to the case 65 and the solenoid structural member 72 is fitted to the central opening. The bobbin 68 is wound with a coil 69 and is held between a lid 70 and a lid 71.

  The Solenoi structural member 72 is a structural material that holds a part of the components constituting the solenoid, such as the movable magnetic pole 60, and also constitutes a part of the magnetic circuit. That is, the solenoid structural member 72 slidably holds the movable magnetic pole 60 in the hollow part of the movable magnetic pole holding part 75 formed in a substantially cylindrical shape. Further, the distal end portion of the movable magnetic pole holding portion 75 is formed as a thin portion 76 so as to be fitted to the annular connecting member 64. Further, the base end side of the movable magnetic pole holding part 75 is fitted to the lid 71, and the screw member holding part 74 is formed outside the portion fitted to the lid 71. The screw member holding part 74 has a screw cut on the outer peripheral surface, and a fixing member 79 is screwed into the lid 71 and the solenoid structure member 72. Further, a protruding portion 73 is formed on the distal end side of the screw-in member holding portion 74. The protrusion 73 has a threaded inner peripheral surface, and a screwing member 78 is screwed therein. The screw member 78 can slide the shaft 58 toward the spring 55 by being screwed deeply into the protrusion 73. When the shaft 58 slides toward the spring 55, a pressing force is applied to the spring 55, so that the set pressure of the second valve body 30 can be increased. The screwing member 78 is a screw for adjusting the operating pressure of the second valve body 30 and can be screwed to the point where the escape space 82 is completely filled. Moreover, when the screwing member 78 is rotated to the opposite side, the set pressure of the second valve body 30 can be lowered. In addition, a screw 80 is screwed into the end portion of the screw member 78. When the protrusion 73 and the screw member 78 are tightened by the screw 80, unnecessary rotation of the screw member 78 is prevented, and the second valve body 30 is secured. Can be maintained at a constant value.

  The annular connecting member 64 is formed in a substantially cylindrical shape, and the thin portion 48a of the communication path support member 45 and the thin portion 76 of the solenoid structural member 72 are fitted to prevent oil from leaking to the outside. ing. Similarly, an O-ring 81 is provided on the shaft 58 side of the screw-in member 78 to prevent oil from leaking from the hollow portion of the protruding portion 73.

  Furthermore, the operation of the composite valve 10 according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a partially enlarged cross-sectional view (2) of the first valve body and the second valve body of the composite valve according to the first embodiment of the present invention, and their peripheral parts, (a) A state where the solenoid is not energized and the second valve element is open, (b) shows a state where the solenoid is energized and the second valve element is open. The reference numerals used in FIG. 3 are the same as those in FIG.

  When the coil 69 is not energized and the upstream oil passage pressure does not reach the set value, the first valve body 20 closes the downstream first communication passages 39 and 40 as shown in FIG. Further, the second valve body 30 closes the downstream second communication passage 42. Therefore, in this state, oil does not flow from the openings 50 and 51 to the downstream oil passage. Next, when the coil 69 is energized by the operation of the solenoid control circuit, the movable magnetic pole 60 is attracted to the fixed magnetic pole portion 48 to slide the shaft 56, and the shaft 56 further moves the first valve body 20 toward the spring 44. Slide. Then, the openings 23 and 24 of the first valve body 20 overlap the openings of the downstream first communication passages 39 and 40. As a result, as shown in FIG. 2A, the downstream first communication passages 39 and 40 are opened to the annular communication passage 53, and from the upstream oil passage, the upstream communication passage 38 and the downstream first communication passage. Oil flows into the passages 39 and 40 and the annular communication passage 53 and is sent to the downstream oil passage through the openings 50 and 51.

  If the pressure in the upstream oil passage exceeds the set value when the coil 69 is not energized, as shown in FIG. 3 (c), the upstream communication passage 38, the connection passage from the upstream oil passage. 41, the pressure of the oil flowing into the downstream second communication passage 42 overcomes the pressing force of the spring 55, and the second valve body 30 is separated from the seat surface 43. Then, oil flows from the downstream second communication path 42 to the storage space 54, from the storage space 54 to the annular communication path 53 via the openings 25 and 26, and further to the downstream oil path via the openings 50 and 51. Is done. Note that when either the first valve body 20 or the second valve body 30 is in an open state, the pressure in the upstream oil passage does not increase, so there is no functional meaning, but as shown in FIG. In addition, both the first valve body 20 and the second valve body 30 can be simultaneously opened.

  As described above, in the composite valve 10 according to the first embodiment of the present invention, the unload valve by the first valve body 20 and the relief valve by the second valve body 30 function independently of each other. Therefore, the composite valve 10 can be easily downsized. Further, in the communication path component 11, the upstream side of the downstream side first communication paths 39 and 40 related to the unload valve and the downstream side second communication path 42 related to the relief valve are made common as the upstream side communication path 38, Further, since the connecting path to the downstream oil path is the common annular communication path 53, the communication path component 11 can be easily downsized. Furthermore, in the solenoid component 12, by forming hollow portions in the shaft 56 and the movable magnetic pole 60 related to the operation of the first valve body 20, the spring 55 and the shaft 58 related to the operation of the second valve body 30 are made hollow. Since it arrange | positions in a part and it is made not to interfere both, the size reduction of the solenoid component 12 becomes easy. In other words, since the composite valve 10 can be reduced in size as a whole, it can be dramatically reduced in size, and the design difficulty increases as in the case of partial reduction in size. Absent. In addition, since the upstream communication passage 38 connected to the upstream oil passage matches the sliding direction of the sliding parts, it is possible to easily realize the composite valve 10 having a particularly narrow and long cylindrical shape. . Moreover, since each part has many simple shapes centering on a cylindrical shape, it is easy to process and can be manufactured at low cost.

  Furthermore, a composite valve according to a second embodiment of the present invention will be described. FIG. 6 is a partially enlarged cross-sectional view of the first valve body and the second valve body of the composite valve according to the second embodiment, and their peripheral portions, and (a) does not energize the solenoid. The state (b) shows a state in which the solenoid is energized. In FIG. 6, reference numerals 83 and 84 denote openings, and other reference numerals are the same as those in FIG.

  In the composite valve according to the second embodiment of the present invention, as shown in FIG. 6A, when the coil 69 is not energized, the openings 83 and 84 of the first valve body 20 are on the downstream side. It overlaps with the openings of the one communication passages 39 and 40. Therefore, the unload valve is in an open state when not energized. As shown in FIG. 6B, when the coil 69 is energized, the first valve body 20 slides, and the openings 83 and 84 are separated from the openings of the downstream first communication passages 39 and 40. Therefore, the unload valve is closed. As described above, in the composite valve according to this embodiment, energization and de-energization of the solenoid can be set in reverse with respect to opening and closing of the unload valve. Furthermore, components other than the first valve body 20 can use the same components as the composite valve according to the first embodiment.

  The present invention is not limited to the above-described contents. For example, the direction in which the upstream communication path 38 opens in the communication path constituting member 35 is different, and the scope described in each claim. Various modifications can be made without departing from the above.

DESCRIPTION OF SYMBOLS 10 Composite valve 11 Communication path component 12 Solenoid component 20 1st valve body 21 Main body part 22 Hollow part 23 Opening part 24 Opening part 25 Opening part 26 Opening part 27 Flange part 28 Outer peripheral surface 29 Inner peripheral surface 29a Inner peripheral groove 30 Second valve body 31 Body portion 32 Flange portion 33 Tip portion 34 Conical surface 35 Communication path constituting member 36 Flange portion 36a End surface portion 37 Body portion 37a End surface portion 38 Upstream side communication path 39 Downstream side first communication path 40 Downstream side 1st communication path 41 Connection path 42 2nd downstream communication path 43 Seat surface 44 Spring 45 Communication path support member 46 Flange part 47 Main part 47a Thick part 48 Fixed magnetic pole part 48a Thin part 49 Inclined surface 50 Opening part 51 Opening part 52 Escape space 53 Annular communication path 54 Storage space 55 Spring 56 Shaft 57 Storage space 58 Shaft 59 Escape space 6 Movable magnetic pole 61 Through hole 62 Inclined surface 63 Relief space 64 Annular connecting member 65 Case 66 Thin part 67 Thin part 68 Bobbin 69 Coil 70 Lid 71 Lid 72 Solenoid structural member 73 Projection part 74 Screwed member holding part 75 Movable magnetic pole holding part 76 Thin Portion 77 Pressure adjusting space 78 Screw member 79 Fixing member 80 Screw 81 O-ring 82 Relief space 83 Opening 84 Opening 85 Relief valve 86 Valve casing 87 First supply / discharge passage 88 Tank conduit 89 Second supply / discharge passage 90 Valve assembly 91 Accumulator 92 Valve spring 93 Oil hole 94 Valve seat member 95 Valve body 96 Guide sleeve 97 Valve body 98 Valve seat member 100 Unload valve 101 Main valve 102 Spool 103 Spring chamber 104 First small diameter portion 105 Large diameter portion 106 Second small diameter portion 107 Left end surface 108 Sleeve 109 Slide Child 110 Spring 111 spring receiving 112 valve body 113 spaces 114 sleeve 115 load pressure introduction port 116 tank port 117 outlet port 118 first inlet port 119 the solenoid 120 the variable displacement hydraulic pump

Claims (7)

A communication path component formed in a substantially columnar shape and formed with first and second communication paths for communicating the upstream oil path and the downstream oil path by perforating the inside;
A first valve body provided so as to be able to open the opening on the downstream oil passage side of the first communication passage by sliding along the central axis of the communication passage constituting member;
A second valve body provided to be capable of opening the opening on the downstream oil passage side of the second communication passage by sliding along the central axis of the communication passage constituting member;
A coil, a fixed magnetic pole provided in the vicinity of the coil, and a movable magnetic pole attracted to the fixed magnetic pole when the coil is energized, the movable magnetic pole directly or against the first valve body A solenoid that is indirectly coupled and that slides the first valve body along a central axis of the communication path component when energizing the coil;
A first end abutting against the second valve body, and pressing the second valve body toward the opening on the downstream oil passage side of the second communication path by an elastic force; and When the hydraulic pressure in the second communication passage exceeds a predetermined value, the second valve body is overcome from the opening on the downstream oil passage side of the second communication passage through the communication passage. A spring provided to slide and separate along the central axis of the component ,
The communication path constituting member has an opening on the upstream oil passage side of the second communication path formed on a first end surface, and the opening on the downstream oil path side of the second communication path on a second end surface. A composite valve characterized in that is formed . The communication path constituting member has an opening on the upstream oil passage side of the first communication path formed on a first end surface, and an opening on the downstream oil path side of the first communication path opened on an outer peripheral surface. And
The first valve body is formed in a substantially cylindrical shape, and at least the opening on the downstream oil passage side of the first communication passage of the communication passage constituting member and the vicinity thereof are disposed in a hollow portion. The composite valve according to claim 1, wherein: In the communication path component, the opening on the upstream oil passage side of the first communication path and the opening on the upstream oil path side of the second communication path are common to each other. The composite valve according to claim 1 or 2 . The first valve body has a first opening on an outer peripheral surface thereof, and the first opening has the downstream oil in the first communication path of the communication path component when the coil is energized. The composite valve according to claim 2 or 3 , wherein the first communication passage and the downstream oil passage are communicated with each other so as to overlap an opening on the road side. The first valve body has a second opening on the outer peripheral surface, and the second opening is the opening on the downstream oil passage side of the second communication path. 5. The composite valve according to claim 1 , wherein the composite valve is disposed so as to communicate the second communication passage and the downstream oil passage when being separated from each other. Further, the first shaft is formed in a substantially cylindrical shape, the first end abuts on the first valve body, and the second end abuts on the movable magnetic pole of the solenoid. ,
The composite valve according to any one of claims 1 to 5 , wherein a part of the second valve body and the spring are disposed in a hollow portion of the first shaft. The movable magnetic pole is formed in a substantially cylindrical shape,
Further, at least a part is disposed in the hollow portion of the movable magnetic pole, the first end portion is in contact with the second end portion of the spring, and the second end portion is in contact with the pressure adjusting screw. The composite valve according to claim 6 , further comprising a second shaft.

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