Control valve device

Abstract

A control valve device 100 comprises: a first control valve 10A; a housing 20 provided with the first control valve 10A; a cap 30 attached to the housing 20 and provided with a first pilot chamber 11A and a first electromagnetic proportional valve 50A of the first control valve 10A; and an electromagnetic relief valve 40 that is attached to the housing 20 alongside the first pilot chamber 11A and can electrically set the maximum pressure of hydraulic oil supplied and discharged from the first control valve 10A to an actuator. The first electromagnetic proportional valve 50A reduce primary pressure hydraulic oil to generate secondary pressure hydraulic oil that is guided to the first pilot chamber 11A. The cap 30 comprises a first detection port 35A to which a pressure sensor 60 for detecting the secondary pressure is attached. The first detection port 35A is provided obliquely to the direction directly facing the electromagnetic relief valve 40 so that the pressure sensor 60 attached to the first detection port 35A does not interfere with the electromagnetic relief valve 40.

Description

Control valve device

[0001] The present invention relates to a control valve device.

[0002] JP2020-133692A (see, for example, FIG. 5) discloses a multi-control valve unit in which an electromagnetic proportional valve that controls the pilot pressure of a control valve is attached to the cover of a housing that accommodates a spool of the control valve.

[0003] By providing a pressure sensor that detects secondary pressure in a control valve whose secondary pressure (pilot pressure) is controlled by an electromagnetic proportional valve, various controls (such as determining whether the control valve is operating normally) can be performed based on the signal from the pressure sensor. The pressure sensor can be installed without enlarging the cap by being located near the pilot chamber on the electromagnetic proportional valve side of the cap, which is provided with the pilot chamber of the control valve to which the secondary pressure working fluid is guided from the electromagnetic proportional valve.

[0004] On the other hand, in the control valve, an electromagnetic relief valve that can electrically set the maximum pressure of the working fluid supplied to or discharged from the actuator is sometimes installed alongside the pilot chamber, and the electromagnetic relief valve has an increased overall length due to a coil, etc. For this reason, the electromagnetic relief valve installed alongside the pilot chamber may extend up to the installation position of the pressure sensor and interfere with the pressure sensor.

[0005] However, if the installation position of the pressure sensor is shifted in the axial direction of the control valve away from the electromagnetic relief valve to a position where it does not interfere with the electromagnetic relief valve, this may result in an increase in the size of the entire control valve device due to the expansion of the cap in the axial direction of the control valve.

[0006] The present invention has been made in view of such problems, and aims to suppress the size increase.

[0007] According to one aspect of the present invention, there is provided a control valve device comprising: a first control valve driven by working fluid led to a first pilot chamber; a housing in which the first control valve is provided; a cap attached to the housing in which a first electromagnetic proportional valve is provided that controls the pressure of the first pilot chamber and the working fluid led to the first pilot chamber; and a solenoid relief valve attached to the housing alongside the first pilot chamber and capable of electrically setting a maximum pressure of the working fluid supplied to or discharged from the first control valve to an actuator, wherein the first electromagnetic proportional valve reduces the pressure of working fluid at a primary pressure to generate working fluid at a secondary pressure as the working fluid led to the first pilot chamber, and the cap has a first detection port in which a pressure sensor that detects the secondary pressure is attached, and the first detection port is arranged to face obliquely from a direction directly facing the solenoid relief valve so that the pressure sensor attached to the first detection port does not interfere with the solenoid relief valve.

[0008] Fig. 1 is a front view showing a main part of a control valve device according to an embodiment of the present invention. Fig. 2 is a cross-sectional view of a main part of a control valve device according to an embodiment of the present invention. Fig. 3 is a perspective view of a cap according to an embodiment of the present invention. Fig. 4 is a cross-sectional view of the periphery of a first pilot chamber according to an embodiment of the present invention. Fig. 5 is a cross-sectional view of a main part of a first control valve according to an embodiment of the present invention.

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0010] The control valve device 100 described below is used in a work machine such as a power shovel. Although the following description will be given of a case in which the work machine is a power shovel, the work machine may be another work machine such as a wheel loader. Furthermore, although hydraulic oil is used as the working fluid, the working fluid may be another fluid such as hydraulic water.

[0011] As shown in Figures 1 to 5, the control valve device 100 includes a control valve 10 that is driven by hydraulic oil guided to a pilot chamber 11, a housing 20 in which the control valve 10 is provided, a cap 30 that is attached to the housing 20 and in which an electromagnetic proportional valve 50 (see Figure 2) that controls the pressure of the pilot chamber 11 and the hydraulic oil guided to the pilot chamber 11 is provided, and an electromagnetic relief valve 40 (see Figures 1 and 5) that is attached to the housing 20 alongside the pilot chamber 11 and can electrically set the maximum pressure of the hydraulic oil that is supplied to and discharged from the control valve 10 to an actuator.

[0012] In Fig. 1, the control valve 10 is shown schematically by a broken line in a block form. In Fig. 2, a cross-section of the main parts of the control valve device 100 is shown, with the proportional solenoid valve 50 attached, from the opposite side to that shown in Fig. 1. The configuration is reversed in the left-right direction between Fig. 1 and Fig. 2. In Figs. 2, 4, and 5, the external shapes of the housing 20 and the cap 30 are simplified, and Fig. 4 shows a cross-section of the main parts of the cap 30 as seen from the right side in Fig. 2.

[0013] As shown in FIG. 4, the control valve 10 has a pilot chamber 11, a spool 12 that is driven by the pressure of hydraulic oil introduced into the pilot chamber 11, a rod 13 that is connected to one end of the spool 12 and extends into the pilot chamber 11, a spring 14 that is housed in the pilot chamber 11 and applies a biasing force to one end of the spool 12, and spring bearing members 15 and 16 that are housed in the pilot chamber 11 and are slidable along the outer periphery of the rod 13 with the spring 14 interposed therebetween.

[0014] The spool 12 of the control valve 10 is slidably mounted in the housing 20. The housing 20 has a rectangular parallelepiped shape and has an installation surface 20a on which the cap 30 is installed. An accommodating hole 20b for the spool 12 opens in the installation surface 20a of the housing 20.

[0015] The cap 30 has an attachment surface 30a for attachment to the housing 20, and is fixed to the housing 20 with bolts, with the attachment surface 30a abutting the installation surface 20a. The pilot chamber 11 opens into the attachment surface 30a of the cap 30, and the pilot chamber 11 is defined by attaching the cap 30 to the housing 20. The cap 30 is a long cap that extends in the axial direction of the control valve 10 (the vertical direction in FIG. 4 ) according to the length of the pilot chamber 11 that accommodates the spring 14.

[0016] The cap 30 has an installation surface 30b on which the electromagnetic proportional valve 50 is installed, and a housing chamber 34 formed in the installation surface 30b to house the valve element 51 of the electromagnetic proportional valve 50. The installation surface 30b is located opposite the mounting surface 30a, and the housing chamber 34 extends in a direction perpendicular to the installation surface 30b (the up-down direction in FIG. 4 ) and thus extends along the axial direction of the control valve 10. The electromagnetic proportional valve 50 is attached to the installation surface 30b with the valve element 51 inserted into the housing chamber 34, and the valve element 51 is slidably housed in the housing chamber 34.

[0017] As shown in Figures 2 and 4, the cap 30 has a primary pressure passage 31 that guides the hydraulic oil discharged from a pump (not shown) serving as a fluid pressure supply source to the electromagnetic proportional valve 50 as hydraulic oil at a primary pressure, a secondary pressure passage 32 (see Figure 4) that guides the hydraulic oil that has been reduced in pressure from the primary pressure to the secondary pressure by the electromagnetic proportional valve 50 to the pilot chamber 11, and a drain passage 33 that guides the hydraulic oil that is discharged from the secondary pressure passage 32 (i.e., from the pilot chamber 11) through the electromagnetic proportional valve 50.

[0018] The electromagnetic proportional valve 50 reduces the pressure of the primary pressure hydraulic oil to generate secondary pressure hydraulic oil as hydraulic oil to be introduced into the pilot chamber 11. The electromagnetic proportional valve 50 has a valve element 51 formed of a shaft-shaped member, a solenoid 52 that applies a thrust to the valve element 51, and a coil spring 53 (see FIG. 4 ) that serves as a biasing member that applies a biasing force to the valve element 51 in a direction opposite to the thrust of the solenoid 52.

[0019] The solenoid 52 is fixed to the cap 30 with a bolt. The solenoid 52 is an actuator that moves a push rod 52a (see FIG. 4) forward and backward in response to a supplied control current, and one end of the valve element 51 is fixed to the push rod 52a. The coil spring 53 (see FIG. 4) contracts in accordance with the amount of movement of the valve element 51, and applies to the valve element 51 a biasing force corresponding to the amount of contraction (amount of elastic deformation) from its natural length, thereby biasing the valve element 51 toward the solenoid 52.

[0020] The electromagnetic proportional valve 50 controls the secondary pressure (pilot pressure) output to the pilot chamber 11 in accordance with the control current supplied to the solenoid 52. The electromagnetic proportional valve 50 can be a direct proportional pressure reducing valve that increases the secondary pressure as the current supplied to the solenoid 52 increases.

[0021] The electromagnetic proportional valve 50 has an input port P1 through which primary pressure hydraulic oil is guided from the primary pressure passage 31, an output port P2 through which secondary pressure hydraulic oil is guided to the secondary pressure passage 32, and a drain port P3 through which drain is guided to the drain passage 33, and the passages 31 to 33 are connected to the accommodation chamber 34 through the ports P1 to P3.

[0022] The electromagnetic proportional valve 50 controls the secondary pressure (pilot pressure) output to the pilot chamber 11 by adjusting the communication of the output port P2 with the input port P1 and the drain port P3 through the balance (equivalent) of the thrust force by the solenoid 52 on the valve body 51, the biasing force by the coil spring 53, and the thrust force by the secondary pressure.

[0023] As shown in Fig. 2, a plurality of control valves 10 are provided. The plurality of control valves 10 are arranged side by side in the housing 20 and extend in a direction (vertical direction in Fig. 2) perpendicular to the installation surface 20a of the housing 20. In other words, the direction perpendicular to the installation surface 20a of the housing 20 is the direction perpendicular to the installation surface 30b of the cap 30.

[0024] A plurality of electromagnetic proportional valves 50 are attached to the cap 30 corresponding to the plurality of control valves 10, and the plurality of electromagnetic proportional valves 50 are arranged side by side in the direction in which the plurality of control valves 10 are arranged (left and right direction in FIG. 2 ). The primary pressure passage 31 and the drain passage 33 open to one end face 30c (the end face on the right side in FIG. 2 ) and the other end face 30d (the end face on the left side in FIG. 2 ) of the cap 30 in the direction in which the plurality of control valves 10 are arranged (left and right direction in FIG. 2 ).

[0025] The primary pressure passage 31 has a main primary pressure passage 31a extending in the direction in which the multiple control valves 10 are lined up (left-right direction in FIG. 2 ), and the drain passage 33 has a main drain passage 33a extending in the same direction. The main primary pressure passage 31a and the main drain passage 33a extend linearly from one end face 30c to the other end face 30d of the cap 30, and hydraulic oil from the pump is guided to one end (right end in FIG. 2 ) of the main primary pressure passage 31a through an inlet opening IO of the primary pressure passage 31. The other end (left end in FIG. 2 ) of the main primary pressure passage 31a and both ends of the main drain passage 33a are sealed by plugs PG.

[0026] 4, the primary pressure passage 31 further has an auxiliary primary pressure passage 31b having one end connected to the main primary pressure passage 31a and the other end connected to the electromagnetic proportional valve 50, and the drain passage 33 further has an auxiliary drain passage 33b having one end connected to the main drain passage 33a and the other end connected to the electromagnetic proportional valve 50. A plurality of auxiliary primary pressure passages 31b, secondary pressure passages 32, and auxiliary drain passages 33b are provided corresponding to each electromagnetic proportional valve 50.

[0027] 1, 2, and 5, the control valve device 100 has, as control valves 10, a first control valve 10A provided with an electromagnetic relief valve 40 and a second control valve 10B not provided with an electromagnetic relief valve 40. A first pilot chamber 11A is the pilot chamber 11 of the first control valve 10A, and a second pilot chamber 11B is the pilot chamber 11 of the second control valve 10B. Furthermore, a first electromagnetic proportional valve 50A is the electromagnetic proportional valve 50 corresponding to the first control valve 10A, and a second electromagnetic proportional valve 50B is the electromagnetic proportional valve 50 corresponding to the second control valve 10B.

[0028] 1 and 5, the electromagnetic relief valve 40 is attached to the housing 20 separately from the cap 30. The electromagnetic relief valve 40 is located closer to the viewer in FIG. 1 than the first pilot chamber 11A (see FIG. 2) of the first control valve 10A. In other words, as shown in FIG. 5, the electromagnetic relief valve 40 is located higher in FIG. 5 than the first pilot chamber 11A. The electromagnetic relief valve 40 is arranged alongside the first pilot chamber 11A.

[0029] The electromagnetic relief valve 40 is installed on an installation surface 20a, which is the outer surface of the housing 20, and is arranged side by side with the first pilot chamber 11A in direction D1 (see FIG. 5), which is perpendicular to the direction in which the primary pressure passage 31 extends (the left-right direction in FIGS. 1 and 2 ) and is a direction along the installation surface 30b of the cap 30. The direction in which the primary pressure passage 31 extends is the direction in which the main primary pressure passage 31a of the primary pressure passage 31 extends, or in other words, the direction in which the multiple control valves 10 are lined up (and therefore the direction in which the control valves 10A, 10B are lined up). The electromagnetic relief valve 40 is arranged side by side with the first pilot chamber 11A along direction D1 (see FIG. 5).

[0030] As shown in Fig. 5, the first control valve 10A includes a supply / discharge passage 21 through which hydraulic oil flows to be supplied to and discharged from the actuator via a supply / discharge port 21a, and a tank passage 22 that communicates with a tank (not shown). The supply / discharge passage 21 and the tank passage 22 communicate with a housing hole 20b of the spool 12, and communication between the supply / discharge passage 21 and the tank passage 22 is switched between on and off by the spool 12. The spool 12 blocks communication between the supply / discharge passage 21 and the tank passage 22 when in the position shown in Fig. 5. When the spool 12 moves to the right in Fig. 5 and the supply / discharge passage 21 and the tank passage 22 are connected, hydraulic oil is discharged from the actuator to the tank passage 22 via the supply / discharge port 21a, the supply / discharge passage 21, and the housing hole 20b.

[0031] The first control valve 10A further includes a relief passage 23 that connects the supply / discharge passage 21 and the tank passage 22. The first control valve 10A is a backup control valve, and various actuators are used as the actuator to which hydraulic oil is supplied or discharged from the first control valve 10A depending on the attachment attached to the work machine. For this reason, an electromagnetic relief valve 40 is provided in the relief passage 23, which makes it easy to set and change the relief pressure as the maximum pressure depending on the attached attachment. The electromagnetic relief valve 40 is located closer to the supply / discharge port 21a than the cap 30 in direction D1.

[0032] When the pressure in the supply / discharge passage 21 exceeds a preset relief pressure, the electromagnetic relief valve 40 opens, and hydraulic oil is discharged from the supply / discharge passage 21 through the relief passage 23 to the tank passage 22. This prevents an excessive increase in pressure in the supply / discharge passage 21 and the actuator. Although not shown, another electromagnetic relief valve 40 is also provided on the side of the other supply / discharge passage of the first control valve 10A.

[0033] 1 to 3, the cap 30 further includes a detection port 35 to which a pressure sensor 60 (see FIG. 5) for detecting the secondary pressure is attached, and a cylindrical portion 36 into which the detection port 35 opens. The detection port 35 opens at the tip of the cylindrical portion 36 and communicates with the secondary pressure passage 32 through an internal passage 36a (see FIG. 4) of the cylindrical portion 36. Note that in FIGS. 4 and 5, the detection port 35 is not located in the cap portion on the side where the cross section shown in FIG. 4 is formed, but in the other cap portion (see FIG. 5) where a cross section matching that cross section is formed, and in FIG. 5, the detection port 35 is hidden behind the cylindrical portion 36 as indicated by the dashed line.

[0034] 1 to 5, the detection port 35 is provided near the pilot chamber 11, closer to the solenoid proportional valve 50 than the pilot chamber 11, in the axial direction of the control valve 10. By providing the detection port 35 in this manner, the pressure sensor 60 can be installed without enlarging the cap 30. In other words, the axial direction of the control valve 10 is the direction in which the spool 12 extends. A pressure sensor 60 (see FIG. 5) that detects the secondary pressure generated by the solenoid proportional valve 50 is attached to the detection port 35, and the pressure sensor 60 is attached to the detection port 35 by being screwed into a female thread (not shown) formed in the cylindrical portion 36.

[0035] 1 to 5, the control valve device 100 has, as detection ports 35, a first detection port 35A provided corresponding to the first electromagnetic proportional valve 50A and a second detection port 35B provided corresponding to the second electromagnetic proportional valve 50B. The pressure sensor 60 attached to the first detection port 35A detects the secondary pressure generated by the first electromagnetic proportional valve 50A, and the pressure sensor 60 attached to the second detection port 35B detects the secondary pressure generated by the second electromagnetic proportional valve 50B. The detection ports 35A and 35B are provided on the side of the cap 30 on the electromagnetic relief valve 40 side in direction D1 (see FIG. 5).

[0036] As shown in FIG. 1, the electromagnetic relief valve 40 has a longer overall length than the mechanical relief valve 70 provided in the second control valve 10B, and as shown in FIG. 5, it extends in the direction in which the spool 12 extends (the left-right direction in FIG. 5) to the installation position of the pressure sensor 60, that is, the position of the first detection port 35A.

[0037] In contrast to this, in this embodiment, as can be seen from Figures 1 and 5, the first detection port 35A is arranged to face obliquely from a direction directly facing the electromagnetic relief valve 40 so that the pressure sensor 60 (see Figure 5) attached to the first detection port 35A does not interfere with the electromagnetic relief valve 40.

[0038] This makes it possible to avoid interference between the electromagnetic relief valve 40 and the pressure sensor 60 without shifting the installation position of the pressure sensor 60 away from the electromagnetic relief valve 40 in the axial direction of the control valve 10. Therefore, it is not necessary to enlarge the cap 30 in the axial direction of the control valve 10 (the left-right direction in FIG. 5 ), and it is possible to suppress an increase in the size of the control valve device 100.

[0039] In this embodiment, facing diagonally from a direction directly facing the electromagnetic relief valve 40 does not include facing directly to the side (left and right direction in Figure 1) from a direction directly facing the electromagnetic relief valve 40, and structurally does not include facing the opposite side from the electromagnetic relief valve 40 side (downward in Figure 5).

[0040] In order to avoid interference between the electromagnetic relief valve 40 and the pressure sensor 60, for example, it is conceivable to orient the first detection port 35A diagonally upward to the right in Fig. 5 instead of facing directly towards the electromagnetic relief valve 40. However, in this case, when the electromagnetic relief valve 40 is viewed from directly above (viewed from the right side along the left-right direction in Fig. 5), the pressure sensor 60 or the wiring 61 of the pressure sensor 60 will be arranged to overlap with the electromagnetic relief valve 40. For this reason, in this case, when removing the electromagnetic relief valve 40, the pressure sensor 60 or the wiring 61 will get in the way, so that the pressure sensor 60 will have to be removed first, or even if it is possible to avoid removing the pressure sensor 60, the wiring 61 will get in the way, making it difficult to remove the electromagnetic relief valve 40.

[0041] In this embodiment, the first cylindrical portion 36A, which is the cylindrical portion 36 of the first detection port 35A, extends along the installation surface 30b of the cap 30. In this way, the pressure sensor 60 and the wiring 61 can be prevented from overlapping with the electromagnetic relief valve 40 when viewed from directly above. Therefore, when removing the electromagnetic relief valve 40, it is not necessary to remove the pressure sensor 60 first, and the wiring 61 does not get in the way, making it possible to facilitate removal of the electromagnetic relief valve 40.

[0042] 1, cap 30 has second detection port 35BA, which serves as second detection port 35B, disposed adjacent to first detection port 35A on the side (left side in FIG. 1) toward which first detection port 35A faces in the direction in which control valves 10A, 10B are aligned (left-right direction in FIG. 1). Second detection port 35BA faces the side (left side in FIG. 1) toward which first detection port 35A faces in the direction in which control valves 10A, 10B are aligned.

[0043] This prevents interference between the pressure sensors 60 attached to adjacent detection ports 35A, 35BA. In other words, if the second detection port 35BA faces the front side in Fig. 1, the pressure sensors 60 attached to the detection ports 35A, 35BA may interfere with each other, but this prevents such interference. The orientation of the second detection port 35BA is aligned with the orientation of the first detection port 35A.

[0044] As shown in Fig. 2, a plurality of second control valves 10B are provided. As shown in Figs. 1 to 3, a plurality of second electromagnetic proportional valves 50B and a plurality of second detection ports 35B are provided in the cap 30 corresponding to the plurality of second control valves 10B. The second cylindrical portion 36B, which is the cylindrical portion 36 of the second detection port 35B, extends along the installation surface 30b of the cap 30, similar to the first cylindrical portion 36A of the first detection port 35A.

[0045] The second detection port 35BB is disposed on the opposite side (right side in FIG. 1) of the first detection port 35A from the side (left side in FIG. 1) to which the first detection port 35A faces in the direction in which the control valves 10A, 10B are aligned (left-right direction in FIG. 1), and faces in a different direction from the first detection port 35A. The second detection port 35BB faces the front in FIG. 1, that is, toward the supply / discharge port 21a (see FIG. 5) along direction D1 (see FIG. 5). By arranging the second detection port 35BB in this direction, the passage structure of the hydraulic oil in the cap 30 is simplified.

[0046] 1 and 2, the second control valve 10B is disposed on both sides of the first control valve 10A in the direction in which the control valves 10A, 10B are arranged (left and right direction in FIGS. 1 and 2). The second pilot chamber 11B of the second control valve 10B is similarly disposed relative to the first pilot chamber 11A of the first control valve 10A.

[0047] In the direction in which the control valves 10A, 10B are arranged, one second control valve 10B is provided on one end side (left side in FIG. 1 ) of the first control valve 10A, and three second control valves 10B are provided on the other end side (right side in FIG. 1 ) of the first control valve 10A. Therefore, in the direction in which the control valves 10A, 10B are arranged, the number of second control valves 10B is fewer on the one end side (left side in FIG. 1 ) than on the other end side (right side in FIG. 1 ).

[0048] In this situation, if the first detection port 35A is oriented toward the side with the greater number of second control valves 10B (the right side in FIG. 1), not only the second detection port 35B adjacent to the first detection port 35A on the right in FIG. 1, but also the second detection port 35B adjacent to that on the right, and the second detection port 35B adjacent to that on the right, will have to be oriented diagonally in a chain reaction to avoid interference between the pressure sensors 60, and ultimately three second detection ports 35B will have to be oriented diagonally.

[0049] In this embodiment, the first detection port 35A faces the side with fewer second control valves 10B (left side in FIG. 1 ) in the direction in which the control valves 10A and 10B are arranged (left-right direction in FIG. 1 ). This makes it possible to reduce the number of second detection ports 35B that must be oriented obliquely to avoid interference between the pressure sensors 60 between two adjacent detection ports 35.

[0050] 1 corresponds to the horizontal direction, the left-right direction corresponds to the vertical direction, and the right side corresponds to the vertically upper side. In order to avoid interference between the electromagnetic relief valve 40 and the pressure sensor 60, for example, it is possible to orient the first detection port 35A upward relative to the horizontal direction (to the right side in FIG. 1). However, in this case, rainwater and the like are more likely to enter the first detection port 35A.

[0051] In this embodiment, the first detection port 35A faces downward (toward the left in FIG. 1) in the horizontal direction, which makes it difficult for rainwater and the like to enter the first detection port 35A.

[0052] In order to avoid interference between the pressure sensors 60, it is possible to orient the second detection port 35BB, which is located to the right of the first detection port 35A in Fig. 1, horizontally upward (to the right in Fig. 1), but this also makes it easier for rainwater and the like to infiltrate the second detection port 35BB.

[0053] In this embodiment, the second detection port 35BB is provided so as to face the horizontal direction. This makes it more difficult for rainwater and the like to infiltrate the second detection port 35BB than when the second detection port 35BB faces upward (to the right in FIG. 1 ) relative to the horizontal direction. Furthermore, the hydraulic oil passage structure in the cap 30 is simpler than when the second detection port 35BB faces upward (to the right in FIG. 1 ) or downward (to the left in FIG. 1 ) relative to the horizontal direction.

[0054] The control valve device 100 may be configured to include a single first control valve 10A as the control valve 10. Even in this case, by being able to install the pressure sensor 60 while avoiding the electromagnetic relief valve 40, it is not necessary to expand the cap 30 in the axial direction of the control valve 10, and the size increase of the control valve device 100 can be suppressed.

[0055] The configuration, operation, and effects of the embodiment of the present invention will be described below.

[0056] The control valve device 100 includes a first control valve 10A that is driven by hydraulic oil guided to a first pilot chamber 11A, a housing 20 in which the first control valve 10A is provided, a cap 30 that is attached to the housing 20 and in which a first solenoid proportional valve 50A that controls the pressure of the first pilot chamber 11A and the hydraulic oil guided to the first pilot chamber 11A is provided, and a valve 30 that is attached to the housing 20 alongside the first pilot chamber 11A and electrically controls the maximum pressure of the hydraulic oil that is supplied to or discharged from the first control valve 10A to the actuator. and an electromagnetic relief valve 40 that can be set automatically, wherein the first electromagnetic proportional valve 50A reduces the pressure of the hydraulic oil at a primary pressure to generate hydraulic oil at a secondary pressure as the hydraulic oil to be led to the first pilot chamber 11A, and the cap 30 has a first detection port 35A to which a pressure sensor 60 that detects the secondary pressure is attached, and the first detection port 35A is arranged to face obliquely from a direction directly facing the electromagnetic relief valve 40 so that the pressure sensor 60 attached to the first detection port 35A does not interfere with the electromagnetic relief valve 40.

[0057] According to this configuration, by orienting the first detection port 35A at an angle as described above, the pressure sensor 60 can be installed while avoiding the electromagnetic relief valve 40, so there is no need to expand the cap 30 in the axial direction of the first control valve 10A, and size expansion can be suppressed.

[0058] The housing 20 has an installation surface 20a as the outer surface on which the electromagnetic relief valve 40 is installed, and the cap 30 has a first cylindrical portion 36A into which the first detection port 35A opens, and the first cylindrical portion 36A extends along the installation surface 30b.

[0059] According to this configuration, when the electromagnetic relief valve 40 is viewed from directly above, the pressure sensor 60 or the wiring 61 of the pressure sensor 60 can be prevented from overlapping with the electromagnetic relief valve 40. Therefore, when removing the electromagnetic relief valve 40, it is not necessary to remove the pressure sensor 60 first, and the wiring 61 of the pressure sensor 60 does not get in the way, making it possible to facilitate removal of the electromagnetic relief valve 40.

[0060] The control valve device 100 further includes a second control valve 10B that is arranged alongside the first control valve 10A in the housing 20 and is driven by hydraulic oil that is led to a second pilot chamber 11B. The cap 30 is further provided with a second electromagnetic proportional valve 50B that controls the pressure of the second pilot chamber 11B and the hydraulic oil that is led to the second pilot chamber 11B and reduces the pressure of the hydraulic oil at a primary pressure to generate hydraulic oil at a secondary pressure as the working fluid that is led to the second pilot chamber 11B, and a second detection port 35B to which a pressure sensor 60 that detects the secondary pressure generated by the second electromagnetic proportional valve 50B is attached. The second detection port 35B is arranged adjacent to the first detection port 35A on the side toward which the first detection port 35A faces in the direction in which the control valves 10A, 10B are arranged, and faces the side toward which the first detection port 35A faces.

[0061] This configuration can prevent interference between the pressure sensors 60 attached between the adjacent first detection port 35A and second detection port 35B.

[0062] The control valve device 100 further includes a second control valve 10B that is arranged alongside the first control valve 10A in the housing 20 and is driven by hydraulic oil that is led to a second pilot chamber 11B. The cap 30 is further provided with a second electromagnetic proportional valve 50B that controls the pressure of the second pilot chamber 11B and the hydraulic oil that is led to the second pilot chamber 11B and reduces the pressure of the hydraulic oil at a primary pressure to generate hydraulic oil at a secondary pressure as the hydraulic fluid that is led to the second pilot chamber 11B, and a second detection port 35B to which a pressure sensor 60 that detects the secondary pressure generated by the second electromagnetic proportional valve 50B is attached. A plurality of second control valves 10B are provided and are arranged on both sides of the first control valve 10A in the direction in which the control valves 10A, 10B are arranged, and the first detection port 35A faces the side with fewer second control valves 10B in the direction in which the control valves 10A, 10B are arranged.

[0063] According to this configuration, it is possible to reduce the number of second detection ports 35B that must be oriented obliquely to avoid interference between the pressure sensors 60 between two adjacent detection ports 35.

[0064] The first detection port 35A faces downward relative to the horizontal direction.

[0065] This configuration makes it difficult for rainwater and the like to enter the first detection port 35A.

[0066] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments.

[0067] This application claims priority based on Japanese Patent Application No. 2024-106381, filed with the Japan Patent Office on July 1, 2024, the entire contents of which are incorporated herein by reference.

Claims

1. A control valve device comprising: a first control valve driven by working fluid led to a first pilot chamber; a housing in which the first control valve is provided; a cap attached to the housing in which a first electromagnetic proportional valve is provided for controlling the pressure of the first pilot chamber and the working fluid led to the first pilot chamber; and an electromagnetic relief valve attached to the housing alongside the first pilot chamber and capable of electrically setting the maximum pressure of the working fluid supplied to or discharged from the first control valve to an actuator, wherein the first electromagnetic proportional valve reduces the pressure of working fluid at a primary pressure to generate working fluid at a secondary pressure as the working fluid led to the first pilot chamber, the cap having a first detection port in which a pressure sensor for detecting the secondary pressure is attached, and the first detection port is arranged to face obliquely from a direction directly facing the electromagnetic relief valve so that the pressure sensor attached to the first detection port does not interfere with the electromagnetic relief valve.

2. A control valve device according to claim 1, wherein the housing has an outer surface on which the electromagnetic relief valve is mounted, the cap has a first cylindrical portion into which the first detection port opens, and the first cylindrical portion extends along the outer surface.

3. A control valve device as set forth in claim 1, further comprising a second control valve provided in the housing alongside the first control valve and driven by working fluid led to a second pilot chamber, wherein the cap is further provided with: a second electromagnetic proportional valve that controls the pressure of the second pilot chamber and the working fluid led to the second pilot chamber, and reduces the pressure of the working fluid at the primary pressure to generate working fluid at a secondary pressure as the working fluid led to the second pilot chamber; and a second detection port to which is attached a pressure sensor that detects the secondary pressure generated by the second electromagnetic proportional valve, wherein the second detection port is arranged adjacent to the first detection port on the side toward which the first detection port faces in the direction in which the first control valve and the second control valve are aligned, and faces the side toward which the first detection port faces.

4. A control valve device as claimed in claim 1, further comprising a second control valve arranged in the housing alongside the first control valve and driven by working fluid led to a second pilot chamber, wherein the cap is further provided with: a second electromagnetic proportional valve that controls the pressure of the second pilot chamber and the working fluid led to the second pilot chamber, and reduces the pressure of the working fluid at the primary pressure to generate working fluid at a secondary pressure as the working fluid led to the second pilot chamber; and a second detection port to which is attached a pressure sensor that detects the secondary pressure generated by the second electromagnetic proportional valve, wherein a plurality of second control valves are provided and are arranged on both sides of the first control valve in the direction in which the first control valve and the second control valve are lined up, and the first detection port faces the side with fewer second control valves in the direction in which the first control valve and the second control valve are lined up.

5. A control valve device according to claim 1, wherein the first detection port faces downward relative to the horizontal direction.

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