JP2010169230A - Multiple valve apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deformation such as distortion of a spool sliding hole formed in a valve housing due to fastening force of a fastening member, and to secure slidability of a spool. <P>SOLUTION: Bottomed recessed parts 12 are respectively formed in positions separated from the spool sliding holes 7, 8 in one valve housings 2, 4 of four valve housings 2-5. Bearing face parts 14 for fastening bolts 6 are respectively formed in height positions near mating faces 2B, 4B than axes of the spool sliding holes 7, 8 in a bottom face side of each recessed part 12. Other recessed parts 18 are respectively formed in positions different from the recessed parts 12 away from the spool sliding holes 7, 8 in the other housings 3, 5 to be counterparts. Bearing face parts 19 for fastening bolts 6 are respectively formed in height positions nearer mating faces 3B, 5B than the axes of the spool sliding holes 7, 8 in a bottom face side of the recessed part 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multiple valve device that is mounted on a construction machine such as a hydraulic excavator and is preferably used to drive and control a plurality of hydraulic actuators for traveling and working.

  Generally, in a construction machine such as a hydraulic excavator, pressure oil is supplied to and discharged from a hydraulic actuator (for example, a hydraulic motor, a hydraulic cylinder, etc.) from a hydraulic source such as a hydraulic pump. A multiple valve device composed of a plurality of spool valves (direction control valves) is provided.

  In this type of prior art multiple valve device, there are provided a plurality of spool slide holes, a hydraulic pressure source side oil passage and an actuator side oil passage communicating with the respective spool slide holes. A valve housing, and a plurality of spools that are respectively inserted and fitted into the respective spool sliding holes of the valve housing and that selectively communicate and block the oil passage on the hydraulic source side and the oil passage on the actuator side. There is something.

  Moreover, as a valve assembly used for such a multiple valve device, for example, it has 3 to 4 or more valve housings, and these valve housings are brought into contact with each other by the mating surfaces and overlapped. A so-called stack type is known in which the valve housings are integrally fastened by a plurality of fastening members (see, for example, Patent Document 1).

JP 11-344143 A

  By the way, in the above-described multiple valve device according to the prior art, for example, a plurality of valve housings are brought into contact with each other at the mating surfaces and overlapped, and in this state, a fastening member made of a long bolt is passed through each valve housing. And a plurality of valve housings are integrally fastened by screwing a nut to the tip (projecting end).

  In this case, the plurality of valve housings are generally made of cast metal and are formed with tortuous passage holes extending through their mating surfaces. And since these passage holes are where the mating surfaces are connected to the passage, unless the tightening force by the long bolts and nuts is sufficiently increased, oil leakage occurs between the mating surfaces. It will cause.

  For this reason, the spool sliding hole formed in each valve housing may be distorted and deformed by a strong tightening force by the long bolt and the nut. If the amount of distortion in this case increases, the movement of the spool inserted into the spool sliding hole becomes worse, and the reliability and life of the multiple valve device is reduced.

  Therefore, in the prior art, finishing of the spool sliding hole and the like are additionally performed in a state where the plurality of valve housings are integrally fastened. However, if such an additional finishing process is performed, chips generated by the additional finishing process may remain in the passage hole extending through the mating surface of the housing even in the subsequent cleaning operation. There is a problem that it is difficult to sufficiently perform the cleaning operation and the reliability as a multiple valve device is lowered.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to prevent the spool sliding hole formed in the valve housing from being deformed so as to be distorted by the fastening force of the fastening member. It is another object of the present invention to provide a multiple valve device that can improve the service life.

  In order to solve the above-described problems, the present invention has a spool sliding hole for slidably inserting a spool, and both outer surfaces or one outer surface facing each other across the spool sliding hole. A plurality of valve housings made of a substantially rectangular block body having a mating surface, and a plurality of valve housings integrally fastened in a state where the valve housings are abutted and overlapped with each other at the mating surfaces It is applied to a multiple valve device comprising a fastening member.

  A feature of the configuration adopted by the invention of claim 1 is that each valve housing is formed with a fastening seat surface portion at a height position closer to the mating surface than the axis of the spool sliding hole, The fastening member is configured to fasten the two valve housings in a state where the seat surface portion provided in one of the valve housings is pressed against the counterpart valve housing.

  According to a second aspect of the present invention, in each of the valve housings, an extension direction of the spool sliding hole is an X-axis direction, and directions perpendicular to the X-axis direction are a Y-axis direction and a Z-axis direction, respectively. In this case, a plurality of the seating surface portions are provided in the Y-axis direction apart from the spool sliding hole extending in the X-axis direction, and each seating surface portion extends from the axis of the spool sliding hole in the Z-axis direction. Is formed at a position close to the mating surface.

  According to the invention of claim 3, each of the valve housings is spaced apart in the Y-axis direction with respect to the spool sliding hole extending in the X-axis direction and is recessed in the Z-axis direction, and the plurality of fastening members are inserted therein. And each of the seating surface portions is provided on the bottom surface side of each of the recessed portions.

  According to a fourth aspect of the present invention, the seat surface provided in the one valve housing is provided with a bolt insertion hole extending toward a mating surface with the counterpart valve housing, and the counterpart valve housing The internal thread hole is formed at a position facing the bolt insertion hole at a position closer to the mating surface than the axis of the spool sliding hole, and the fastening member is screwed into the internal thread hole through the bolt insertion hole. It is constituted by a fastening bolt having a male screw to be joined.

  As described above, according to the first aspect of the present invention, for example, two valve housings stacked one on top of the other are fastened by a fastening member in a state in which the seat surface portion of one valve housing is pressed against the other valve housing. can do. And since the height position of the said seat surface part is a height position close | similar to a mating surface rather than the axis line of a spool sliding hole, it can reduce that the influence of the clamping force by a fastening member reaches a spool sliding hole. And the deformation of the spool sliding hole so as to be distorted can be suppressed.

  Moreover, since the two valve housings are integrally fastened by the fastening member in a state where the respective mating surfaces are abutted and overlapped with each other, the mating surfaces of the two valve housings can be abutted so as to closely contact each other. It is possible to suppress the occurrence of oil leakage, sealing failure, etc. on the mating surfaces, and to ensure sealing performance. Thereby, the reliability as a multiple valve apparatus can be improved and durability and lifetime can be improved.

  According to the second aspect of the present invention, the valve housing is provided with a plurality of seating surface portions spaced apart in the Y-axis direction with respect to the spool sliding hole extending in the X-axis direction, and these seating surface portions are arranged in the Z-axis direction. Since the spool housing is formed at a position closer to the mating surface than the axis of the spool sliding hole, the two valve housings are integrated by a plurality of fastening members so that the mating surfaces abut each other in the Z-axis direction and overlap each other. Thus, the influence of the tightening force by each fastening member on each spool sliding hole can be reduced.

  According to the invention of claim 3, the valve housing is provided with a plurality of recesses that are recessed in the Z-axis direction and spaced from each other in the Y-axis direction with respect to a spool sliding hole extending in the X-axis direction. By providing the recesses, the seating surface portion can be formed on the bottom surface side of each recess. In this case, the recessed portion is formed as a recessed groove extending in the Z-axis direction from one mating surface to the other mating surface among two mating surfaces located on both sides in the Z-axis direction of the valve housing. The groove depth can be set to a depth below the axis of the spool sliding hole.

  Further, according to the invention of claim 4, the seat surface portion is provided with a bolt insertion hole extending toward the mating surface with the counterpart valve housing, and the counterpart valve housing is provided with the bolt insertion hole at a position facing the bolt insertion hole. A female screw hole is formed at a position closer to the mating surface than the axis of the spool sliding hole, and the fastening member is constituted by a fastening bolt screwed into the female screw hole through the bolt insertion hole. As a result, for example, of two valve housings superimposed on the top and bottom, the fastening bolt is inserted into the bolt insertion hole from the seat surface portion of one valve housing, and the tip side is screwed into the female screw hole on the counterpart valve housing side. And a strong fastening force can be generated between the two valve housings.

It is a front view which shows the multiple valve apparatus by embodiment of this invention. It is the top view which looked at the multiple valve apparatus of FIG. 1 from upper direction. It is the right view which looked at the multiple valve apparatus of FIG. 1 from the right side. It is the longitudinal cross-sectional view which looked at the multiple valve apparatus from the arrow IV-IV direction in FIG. It is sectional drawing shown in the decomposition | disassembly state before assembling the valve housing in FIG. It is a longitudinal cross-sectional view which shows the multiple valve apparatus by a comparative example.

  Hereinafter, a multiple valve device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, FIG. 1 thru | or 5 has shown the multiple valve apparatus by embodiment of this invention.

  In the figure, reference numeral 1 denotes a multiple valve device employed in the present embodiment. The multiple valve device 1 includes a plurality of pieces that are overlapped with each other as shown in FIGS. The valve housings 2, 3, 4, 5 and a plurality of fastening bolts 6, 6,... For fastening the valve housings 2, 3, 4, 5 integrally.

  The valve housings 2, 3, 4, and 5 are formed to have a predetermined height dimension H as shown in FIG. Further, the fastening bolt 6 constitutes a fastening member. As shown in FIG. 5, the head 6A as a bolt head and the head 6A are positioned on the opposite side in the axial direction and are externally threaded on the outer peripheral surface. And a threaded portion 6B formed.

  In this case, the valve housings 2 to 5 extend in the left and right directions (X-axis direction in FIG. 2), the front and rear directions (Y-axis direction), and also extend in the upward and downward directions (Z-axis direction). In addition, the substantially rectangular or rectangular parallelepiped block body is formed by using a molding means such as casting. Further, the upper and lower surfaces (outer surfaces) in the Z-axis direction are formed as mating surfaces 2A and 2B in the valve housing 2 as shown in FIG. The mating surfaces 3A and 3B, the mating surfaces 4A and 4B, and the mating surfaces 5A and 5B are formed, respectively.

  The valve housing 2 is overlaid on the counterpart valve housing 3 so as to abut each other via mating surfaces 2B and 3A. The valve housing 3 is superimposed on the mating valve housing 4 so as to abut each other via mating surfaces 3B and 4A, and the valve housing 4 is mated on the mating valve housing 5 via mating surfaces 4B and 5A. Are superimposed to collide with each other.

  Further, as shown in FIG. 1, the valve housing 2 is provided with oil supply / discharge ports 2C, 2D, etc., and these supply / discharge ports 2C, 2D communicate with spool sliding holes 7 or 8 described later. The supply and discharge of the oil liquid is controlled by the spool. The other valve housings 3 to 5 are similarly provided with supply / discharge ports 3C, 3D, supply / discharge ports 4C, 4D, supply / discharge ports 5C, 5D, and the like.

  7 and 8 are, for example, two spool sliding holes formed in the valve housing 2, and the spool sliding holes 7 and 8 are circular shapes extending in parallel with each other in the X-axis direction as shown in FIGS. It is formed as a hole and is spaced apart from each other in the Y-axis direction. In this case, the axis OO of the spool sliding holes 7 and 8 extends parallel to the X axis as illustrated in FIG. 4 and 5, a straight line passing through the axis O of the spool sliding holes 7 and 8 and parallel to the Y axis is indicated by a virtual line 13 described later.

  In these spool sliding holes 7 and 8, for example, spools (not shown) for communicating and blocking between the oil passages between the hydraulic power source and the hydraulic actuator are slidably inserted. Is. Further, such spool sliding holes 7 and 8 are similarly formed for the other valve housings 3 to 5.

  9 and 10 are cover cylinders detachably provided on the valve housing 2, and the cover cylinders 9 and 10 are provided on both sides in the axial direction of the spool sliding holes 7 extending in the X-axis direction as shown in FIGS. Located on the side of the valve housing 2. Here, the cover cylinders 9 and 10 are provided with flange portions 9A and 10A, respectively, and the flange portions 9A and 10A are fixed to the respective side surfaces of the valve housing 2 by bolts 11, 11,. And these cover cylinders 9 and 10 comprise the hydraulic pilot part of what is called a direction control valve.

  Further, as shown in FIG. 2, the cover cylinders 9 and 10 have flange portions 9 </ b> A and 10 </ b> A and bolts 11 on the side surfaces of the valve housing 2 in the same manner on both sides in the axial direction of the spool sliding hole 8 extending in the X-axis direction. Is provided. Further, as shown in FIG. 1, such cover cylinders 9 and 10 are located on both axial sides of the spool sliding holes 7 and 8 extending in the X-axis direction with respect to the other valve housings 3 to 5. The flanges 9A and 10A and bolts 11 are provided on the side surfaces of the valve housings 3 to 5, respectively.

  12, 12... Are recessed portions provided in the valve housing 2, and each recessed portion 12 is forward and rearward in the Y-axis direction from the spool sliding holes 7, 8 as shown in FIGS. It is formed as a bottomed concave groove that is spaced apart and extends in the Z-axis direction, and its bottom side constitutes a seating surface portion 14 described later. And the recessed part 12 is formed with the magnitude | size which can insert the fastening volt | bolt 6 which is a fastening member inside.

  Here, as shown in FIG. 2, each concave recess 12 is formed so as to cut out the four corners of the valve housing 2 at a predetermined depth, and its planar shape is L-shaped. Yes. Further, as shown in FIG. 5, the groove depth H1 of the recessed portion 12 is set so as to satisfy, for example, the following formula 1 with respect to the height dimension H of the valve housing 2.

  The recess 12 is recessed in the Z-axis direction to a position below the axis O of the spool sliding holes 7 and 8 (for example, a virtual line 13 passing through the two axes O and parallel to the Y-axis). It is installed.

  That is, the recess 12 is a recess extending in the Z-axis direction from one mating surface 2A to the other mating surface 2B, out of the two mating surfaces 2A and 2B located on both sides of the valve housing 2 in the Z-axis direction. It is formed as a groove, and the groove depth H1 is set to a depth below the axis O (virtual line 13) of the spool sliding holes 7, 8.

  14, 14,... Indicate seat surface portions formed in the valve housing 2 by the respective recessed portions 12, and these seat surface portions 14 are provided on the corners of the four corners of the valve housing 2 together with the respective recessed portions 12. In addition, a planar surface is formed as a L-shaped seating surface on the bottom side of the recessed portion 12. The height dimension H2 of the seating surface portion 14 is determined by the groove depth H1 of the recess 12 and the relationship satisfying, for example, the following formulas 2 and 3 with respect to the height dimension H of the valve housing 2. Is set to

  Thereby, the height position of the seat surface portion 14 is disposed at a position below the axis O (virtual line 13) of the spool sliding holes 7 and 8, that is, a position close to the mating surface 2B. A bolt insertion hole 15 extending in the Z-axis direction is formed between the seat surface portion 14 and the mating surface 2B as shown in FIG. 5. The fastening bolt 6 is inserted. Further, by making the height dimension H2 of the seating surface portion 14 larger than the dimension (H / 6), the thickness from the seating surface portion 14 to the mating surface 2B can be secured and the required strength can be maintained.

  Here, the fastening bolt 6 constituting the fastening member is inserted into the bolt insertion hole 15 until the head 6A side comes into contact with the seat surface portion 14, and the distal end side of the screw portion 6B is screwed into a female screw hole 17 (to be described later). Worn. Thereby, the valve housing 2 and the counterpart valve housing 3 are integrally fastened by using a plurality of fastening bolts 6.

  16, 16,... Are female screw holes provided on the mating surface 2 </ b> A side of the valve housing 2 and having an internal thread formed on the inner peripheral surface thereof. The female screw holes 16 are formed on the valve housing 2 as shown in FIGS. 2 and 4. On the side of the mating surface 2A, it is disposed at a position adjacent to the recessed portion 12. The female screw hole 16 extends at a predetermined depth in the Z-axis direction, and is formed at a position spaced from the recessed portion 12 in the Y-axis direction. In this case, it is preferable that the female screw hole 16 has an axial length dimension so that the female screw hole 16 is positioned closer to the mating surface 2A than the axial center (virtual line 13) of the spool sliding holes 7 and 8. . The female screw hole 16 of the valve housing 2 is also screwed with the threaded portion 6B of the fastening bolt 6 when another valve housing (not shown) is superimposed on the valve housing 2.

  17 are female screw holes provided on the side of the mating surface 3A of the valve housing 3 and having an internal thread formed on the inner peripheral surface. Each female screw hole 17 is aligned with the mating valve housing 3 as shown in FIG. On the surface 3A side, it is disposed at a position facing the bolt insertion hole 15 of the valve housing 2 in the upward and downward directions (Z-axis direction). In this case, it is preferable that the female screw hole 17 has an axial length dimension so that the female screw hole 17 is positioned closer to the mating surface 3A than the axis of the spool sliding holes 7 and 8 (virtual line 13). . The threaded portion 6B of the fastening bolt 6 inserted into the bolt insertion hole 15 from the recessed recess 12 side of the valve housing 2 is screwed into the female threaded hole 17, whereby the two valve housings 2, 3 are connected. It is fastened as shown in FIG.

  .. Are recessed portions provided in the counterpart valve housing 3, and each recessed portion 18 is separated from the spool sliding holes 7, 8 in the Y-axis direction as shown in FIGS. Then, it is formed as a bottomed groove extending in the Z-axis direction, and the fastening bolt 6 is inserted with a gap inside. The recessed portion 18 is disposed adjacent to the female screw hole 17 on the mating surface 3A side of the valve housing 3, and is opposed to the female screw hole 16 provided in one valve housing 2 in the upward and downward directions (Z-axis direction). It is arrange | positioned in the position to perform.

  Here, like the recessed portion 12 provided in the valve housing 2, the recessed portion 18 has a groove depth H 1, and satisfies the above-mentioned formula 1 with respect to the height dimension H of the valve housing 3. Is set to However, the recessed portion 18 of the valve housing 3 is different from the recessed portion 12 (see FIG. 2) whose planar shape is formed in a U shape or U shape, and whose planar shape is an L shape. is there.

  19, 19,... Represent seat surface portions formed in the valve housing 3 by the respective recessed portions 18, and these seat surface portions 19 have a U shape or a U shape in plan view on the bottom surface side of each recessed portion 18. It is formed as a seating surface. The seat surface portion 19 has a height dimension H2 similar to that of the seat surface portion 14 of the valve housing 2 described above, and satisfies the relations of Formulas 2 and 3 with respect to the height dimension H of the valve housing 3. Is set. Accordingly, the height of the seat surface portion 19 is arranged at a position below the axis O (virtual line 13) of the spool sliding holes 7, 8 as shown in FIG. 5, that is, a position close to the mating surface 3B. Has been.

  20, 20,... Are bolt insertion holes formed in each seat surface portion 19, and each bolt insertion hole 20 is formed as a through hole extending in the Z-axis direction toward the seat surface portion 19 and the mating surface 3 </ b> B. The fastening bolt 6 is inserted into the bolt insertion hole 20 from the recessed portion 18 side of the valve housing 3. The fastening bolt 6 inserted into the bolt insertion hole 20 is in contact with the seat surface portion 19 at the head 6A side, and the front end side of the screw portion 6B is screwed into the female screw hole 16 on the other side. The housings 3 and 4 are fastened as shown in FIG.

  The valve housing 4 which is the counterpart of the valve housing 3 is formed with a recessed portion 12, a seat surface portion 14, a bolt insertion hole 15, a female screw hole 16, and the like, similarly to the valve housing 2 described above. On the other hand, in the valve housing 5 which is the counterpart of the valve housing 4, the female screw hole 17, the recessed recess portion 18, the seat surface portion 19, the bolt insertion hole 20, and the like are formed as in the valve housing 3 described above.

  .. Are mounting holes provided on the side surfaces of the valve housings 2 to 5, and the bolts 11 (FIG. 1 to FIG. 1) are inserted into the mounting holes 21 through the flange portions 9A and 10A of the cover cylinders 9 and 10, respectively. As shown in FIG. 3, the cover cylinders 9 and 10 are detachably attached to both side surfaces of the valve housings 2 to 5.

  The multiple valve device 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, the assembly operation of the multiple valve device 1 will be described. The valve housings 2, 3, 4, and 5 are sequentially brought into contact with each other so as to overlap each other as described below. , 4 and 5 are integrally fastened by using a plurality of fastening bolts 6 respectively.

  That is, at the time of assembling work of the multiple valve device 1, first, the mating surface 4B of the valve housing 4 is overlaid on the mating surface 5A of the valve housing 5, and in this state, the recessed portion of the valve housing 4 The fastening bolt 6 is inserted into the bolt insertion hole 15 from the 12 side. Then, the tip end side of the screw portion 6B is screwed into the female screw hole 17 of the valve housing 5 until the head 6A side of the fastening bolt 6 inserted into the bolt insertion hole 15 is brought into strong contact with the seat surface portion 14 of the valve housing 4. As a result, the two valve housings 4 and 5 are firmly fastened by the fastening bolts 6.

  Next, the mating face 3B of the valve housing 3 is brought into contact with the mating face 4A of the valve housing 4, and in this state, the fastening bolt 6 is inserted into the bolt insertion hole 20 from the recessed recess 18 side of the valve housing 3. Insert. Then, the front end side of the screw portion 6B is screwed into the female screw hole 16 of the valve housing 4 so that the head portion 6A side of the fastening bolt 6 strongly contacts the seat surface portion 19 of the valve housing 3, thereby the two valve housings 3. , 4 are firmly fastened by fastening bolts 6.

  Further, the mating surface 3A of the valve housing 3 is abutted so as to overlap the mating surface 2B of the valve housing 2, and in this state, the fastening bolt is inserted into the bolt insertion hole 15 from the recessed recess 12 side. 6 is inserted. Then, the front end side of the screw portion 6B is screwed into the female screw hole 17 of the valve housing 3 so that the head portion 6A side of the fastening bolt 6 is in strong contact with the seat surface portion 14 of the valve housing 2, and thereby the two valve housings 2 are fitted. , 3 are firmly fastened by fastening bolts 6.

  On the other hand, the spools are slidably inserted into the spool sliding holes 7 and 8 of the valve housings 2 to 5, respectively, and pilot pipes (both not shown) are provided on the cover cylinders 9 and 10 side. ) Etc. Accordingly, for example, left and right traveling direction control valves can be configured on the valve housing 2 side of the multiple valve device 1. On the other valve housings 3 to 5 side, for example, a direction control valve for a boom, an arm, a bucket, or a swivel of the working device can be configured.

  On the other hand, in the case of the multiple valve device 1 'according to the comparative example illustrated in FIG. 6, the valve housings 2', 3 ', 4', 5 'are abutted so as to overlap each other. In this state, for example, four long bolts 22, 22,... Are provided through the valve housings 2 ′ to 5 ′ in the upward and downward directions. Then, a nut 23 is screwed to the distal end (lower end) side of each long bolt 22, and the valve housings 2 ′ to 5 ′ are integrally fastened by the long bolt 22 and the nut 23.

  However, when the long bolts 22 and the nuts 23 are used to fasten the valve housings 2 'to 5', spool sliding holes 7 'and 8' formed in the valve housings 2 'to 5'. 6 receives the tightening force by the long bolt 22 and the nut 23 in the directions indicated by arrows F and F in FIG. 6, and may be distorted into an elliptical shape as indicated by a two-dot chain line in FIG. . If the amount of distortion in this case increases, the movement of the spool inserted into the spool sliding holes 7 ', 8' deteriorates, and the reliability and life of the multiple valve device 1 'decreases.

  Therefore, in the present embodiment, for example, of the four valve housings 2 to 5 constituting the multiple valve device 1, the valve housings 2 and 4 are separated from the spool sliding holes 7 and 8 in the Y-axis direction. Are formed with bottomed concave portions 12, 12,... Extending in the Z-axis direction, and the bottom surface side of these concave portions 12 is more than the axial center O (virtual line 13) of the spool sliding holes 7, 8. A seat surface portion 14 for the fastening bolt 6 is formed at a height position close to the mating surfaces 2B and 4B.

  In addition, the other valve housings 3 and 5 that are counterparts are spaced apart from the spool sliding holes 7 and 8 in the Y-axis direction, and other recessed portions that extend in the Z-axis direction at positions different from the respective recessed portions 12. Are formed below the axial center O (virtual line 13) of the spool sliding holes 7, 8 on the mating surfaces 3B, 5B. A seat surface portion 19 for the fastening bolt 6 is formed at a close height position.

  The seat surface portions 14 and 19 are respectively provided with bolt insertion holes 15 and 20 extending in the Z-axis direction toward the mating surfaces 3A to 5A of the counterpart valve housings 3 to 5, respectively. On the side of the mating surfaces 2A to 5A, female screw holes 16 and 17 into which the fastening bolts 6 are respectively screwed are formed at positions facing the bolt insertion holes 15 and 20, respectively.

  As a result, for example, the two valve housings 2 and 3 stacked one above the other are extended from the seat surface portion 14 of one valve housing 2 toward the female screw hole 17 of the counterpart valve housing 3 via the bolt insertion hole 15. The fastening bolt 6 can be used for fastening. In this case, the height position of the seat surface portion 14 is arranged at a height position closer to the mating surfaces 2B and 3A than the axis O (the imaginary line 13) of the spool sliding holes 7 and 8.

  For this reason, the fastening force by the fastening bolt 6 mainly acts toward the mating surfaces 2B and 3A in the directions indicated by arrows F and F shown in FIG. 8 can be reduced, whereby the spool sliding holes 7 and 8 can be prevented from being deformed so as to be distorted.

  In addition, since the valve housings 2 and 3 in this case are integrally fastened by the fastening bolts 6 with the mating surfaces 2B and 3A abutting each other and overlapping, the mating surfaces 2B and 3A are tightly connected. Can be brought into contact with each other, oil leakage between the mating surfaces 2B and 3A, occurrence of seal failure, etc. can be suppressed, and sufficient sealing performance can be ensured.

  Further, between the other valve housings 3 and 4 and between the valve housings 4 and 5, it is possible to reduce the influence of the tightening force by the respective fastening bolts 6 on the spool sliding holes 7 and 8. Thus, deformation of the spool sliding holes 7 and 8 so as to be distorted can be suppressed.

  Further, for example, the recessed portion 12 and the seat surface portion 14 provided in one of the valve housings 2 and 4 and the recessed portion 18 and the seat surface portion 19 provided in the other valve housing 3 and 5 are arranged at different positions in the Y-axis direction. By doing so, it is possible to prevent the concave and recessed portions 12 and 18 and the seat surface portions 14 and 19 from overlapping each other in the Z-axis direction, and sufficiently securing the fastening strength by the fastening bolt 6 for each valve housing 2 to 5. can do.

  Therefore, according to the present embodiment, when the plurality of valve housings 2 to 5 are superimposed on each other and fastened by the fastening bolt 6, the spool sliding holes 7 and 8 are prevented from being deformed so as to be distorted. As a result, the reliability as the multiple valve device 1, the workability during assembly, and the like can be improved, and the durability and lifespan thereof can be increased.

  In the above-described embodiment, a case where a total of four valve housings 2 to 5 are overlapped with each other and fastened with the fastening bolts 6 has been described as an example. However, the present invention is not limited to this. For example, two valve housings may be superposed on top and bottom and fastened by a fastening bolt 6, and three valve housings or five or more valve housings may be used. It can also be applied to the case of overlapping.

  Moreover, in the said embodiment, the case where the multiple valve apparatus was used for the control valve apparatus in construction machines, such as a hydraulic excavator, was mentioned as an example and demonstrated. However, the multiple valve device according to the present invention is not limited to this, and can also be applied to, for example, a work vehicle called a wheel-type hydraulic excavator, a hydraulic crane, a wheel loader, a bulldozer, or a dump truck. It can also be applied to a device.

1 Multiple valve device 2, 3, 4, 5 Valve housing 2A, 2B, 3A, 3B, 4A, 4B, 5A, 5B Mating surface 6 Fastening bolt (fastening member)
7,8 Spool sliding hole 12,18 Recessed portion 14,19 Seat surface portion 15,20 Bolt insertion hole 16,17 Female screw hole

Claims (4)

From a substantially rectangular block body having a spool sliding hole for slidably inserting a spool and having both outer surfaces facing each other across the spool sliding hole or one outer surface as a mating surface A multiple valve device comprising: a plurality of valve housings; and a plurality of fastening members that integrally fasten the valve housings in a state where the valve housings are abutted and overlapped on the mating surfaces.
In each of the valve housings, a fastening seat surface portion is formed at a height position closer to the mating surface than the axis of the spool sliding hole,
The fastening member is configured to fasten between two valve housings in a state where the seat surface portion provided in one of the valve housings is pressed against a counterpart valve housing. Valve unit.   In each of the valve housings, when the extending direction of the spool sliding hole is the X-axis direction and the directions perpendicular to the X-axis direction are the Y-axis direction and the Z-axis direction, A plurality of spool sliding holes extending in the axial direction are provided apart from each other in the Y-axis direction, and each seating surface portion is formed in a position closer to the mating surface than the axis of the spool sliding hole in the Z-axis direction. The multiple valve device according to claim 1.   Each of the valve housings has a plurality of recessed portions into which the fastening members are inserted by being recessed in the Z-axis direction and spaced apart in the Y-axis direction with respect to the spool sliding hole extending in the X-axis direction, The multiple valve device according to claim 2, wherein each seating surface portion is configured to be provided on a bottom surface side of each recessed portion.   A bolt insertion hole extending toward the mating surface with the counterpart valve housing is formed in the seat surface portion provided in the one valve housing, and the counterpart valve housing faces the bolt insertion hole. A female screw hole is formed at a position closer to the mating surface than the axis of the spool sliding hole, and the fastening member is a fastening bolt having a male screw screwed into the female screw hole through the bolt insertion hole. The multiple valve device according to claim 1, 2 or 3, wherein the multiple valve device is configured.

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