JP4686523B2 - Pilot pressure pattern switching valve for hydraulic excavator - Google Patents

Description

  The present invention is provided between each pilot chamber in each directional switching valve that controls each actuator of a hydraulic excavator and each remote control valve connected to each pilot chamber, and each pilot chamber and each remote control valve The present invention relates to a pilot pressure pattern switching valve for a hydraulic excavator that changes the connection pattern.

In general, an operation of a hydraulic excavator is performed by switching a remote control valve by a plurality of operation levers, and there are a plurality of operation patterns (relationship between the operation direction of the operation lever and the control of each actuator). FIG. 23 shows four general operation patterns (patterns {circle around (1)} to {circle around (4)}) showing the relationship between the operation direction of the left and right operation levers and the control of each actuator. is there. Examples of the pilot pressure pattern switching valve that changes the connection pattern between each pilot chamber and each remote control valve include, for example, Japanese Utility Model Laid-Open No. 2-58061, Japanese Utility Model Laid-Open No. 4-18772, and Japanese Patent Application Laid-Open No. 63-293369. Is disclosed. However, in the pattern switching valves described in these publications, when connecting the pattern switching valve and the direction switching valve, piping for the connection is required, which is not preferable from the viewpoint of space saving and cost increase suppression. In addition, since piping connection work is also required, there is a problem that the pattern switching work becomes complicated.
And since the inlet and outlet are arranged in the direction of the rotation axis of the valve body, there is a problem that the valve body becomes large, and since many connection flow paths are formed in the valve body, the valve body itself is large. There is also a problem that it is converted into an image (see Japanese Patent Laid-Open No. 63-293369).

In view of the above circumstances, the present invention provides a pilot pressure pattern switching valve for a hydraulic excavator that can omit piping for connecting the pilot pressure pattern switching valve and the direction switching valve and pipe connection work.
It is another object of the present invention to provide a pilot pressure pattern switching valve for a hydraulic excavator that can be reduced in size.

Means and effects for solving the problems

  A pilot pressure pattern switching valve for a hydraulic excavator according to a first aspect of the present invention that solves the above-described problems includes a pilot chamber in each directional switching valve that controls each actuator of the hydraulic excavator and each remote controller connected to each pilot chamber. A pilot pressure pattern switching valve of a hydraulic excavator provided between the pilot chamber and changing a connection pattern between each pilot chamber and each remote control valve, each inlet connected to each remote control valve and each direction A main body formed with each outlet connected to each pilot chamber of the switching valve, and a fixing means for fixing the main body to the direction switching valve, and is in contact with the direction switching valve in the main body In the connection surface, the outlet is formed at a position facing the opening on the direction switching valve side communicating with each pilot chamber.

  According to this configuration, the pilot pressure pattern switching valve is directionally formed by forming the outlet connected to the pilot chamber at a position facing the opening on the side of the direction switching valve communicating with the pilot chamber on the connection surface in contact with the direction switching valve. It can be fixed directly to the switching valve. For this reason, piping and piping connection work for connecting the pilot pressure pattern switching valve and the direction switching valve can be omitted.

  A pilot pressure pattern switching valve for a hydraulic excavator according to a second invention is the pilot pressure pattern switching valve according to the first invention, wherein the outlet opens at a position facing a portion of the direction switching valve not surrounded by the spool hole and the bridge passage. It is characterized by.

  According to this configuration, since the outlet connected to the pilot chamber opens at a position facing the portion of the direction switching valve that is not surrounded by the spool hole and the bridge passage, the spool hole and the bridge passage are in the middle. The pilot room and the outlet can be connected without traversing. For this reason, the structure of the direction switching valve side can be simplified.

  A pilot pressure pattern switching valve for a hydraulic excavator according to a third aspect of the present invention is provided between each pilot chamber in each directional switching valve that controls each actuator of the hydraulic excavator and each remote control valve connected to each pilot chamber. A pilot pressure pattern switching valve of a hydraulic excavator provided to change a connection pattern between each pilot chamber and each remote control valve, each inlet connected to one of each remote control valve or each pilot chamber; Each outlet connected to the other of each remote control valve or each pilot chamber, and a main body formed, and a valve body that changes the connection relationship between each inlet and each outlet by being rotated, Each inlet is communicated with each inlet port formed to open to the valve body on a surface on the main body side through which the rotation shaft of the valve body passes. In addition, each of the inlet ports is disposed on a first circumference centered on the rotation axis and on a second circumference centered on the rotation axis and different from the first circumference. It was formed as described above.

  According to this configuration, each inlet port on the main body side that opens with respect to the valve body that rotates and changes the connection relationship between the inlet and the outlet of the main body has two circumferences around the rotation axis of the valve body. Each inlet port can be placed densely for placement above. Therefore, the main body can be made small, and the pilot pressure pattern switching valve can be miniaturized.

  A pilot pressure pattern switching valve for a hydraulic excavator according to a fourth aspect of the present invention is the remote control valve linked to the left and right operation levers of the left and right operation levers of the hydraulic excavator on the first circumference. The inlet ports that communicate with each other are disposed, and the inlet ports that communicate with a remote control valve that interlocks with the front-rear direction operation of the left and right operation levers are disposed on the second circumference.

  According to this configuration, in the connection pattern switching, the inlet ports communicating with the remote control valves that are connected to each pilot chamber are exchanged with the same circle centered on the rotation axis of the valve body. Since it arrange | positions on a periphery, the switching structure by rotation of a valve body can be simplified. Thereby, a valve body can be made small and size reduction of a main body can also be achieved.

  A pilot pressure pattern switching valve for a hydraulic excavator according to a fifth aspect of the present invention includes a pilot chamber in each direction switching valve for controlling each actuator of a boom cylinder, an arm cylinder, a bucket cylinder, and a swing motor of the hydraulic excavator, and each pilot A pilot pressure pattern switching valve of a hydraulic excavator provided between each remote control valve connected to a chamber and changing a connection pattern between each pilot chamber and each remote control valve, each remote control valve or each Each inlet connected to one of the pilot chambers, each outlet connected to each of the remote control valves or the other of the pilot chambers, each inlet port communicating with each inlet, and each outlet communicating with each outlet A body formed with a port, each inlet-side opening connectable to each inlet port, and each outlet port Each of the outlet side openings connectable, and a valve body having a connection passage connecting each of the inlet side openings and the outlet side openings. Each of the outlet ports and the outlets has at least three types of changeable connection patterns of a switching position and a heel switching position, without changing the connection relationship between the inlet ports and the inlet-side openings. By changing the connection relationship with the side opening, the connection pattern is switched between the upper switching position and the second switching position, without changing the connection relationship between each outlet port and each outlet side opening. The connection pattern is switched between the upper switching position and the heel switching position by changing the connection relationship between each inlet port and each inlet opening.

  According to this configuration, the connection pattern is switched by changing the connection relation between each inlet port and each outlet port on the main body side and each inlet side opening and outlet side opening on the valve body side that can be connected to each. When there are at least three types of changeable connection patterns, switching between the upper switching position and the second switching position is performed by changing only the connection relationship between each outlet port and the outlet side opening. Switching between the position and the heel switching position is performed by changing only the connection relationship between each inlet port and the inlet side opening. Thereby, the number of connection passages of the valve body connecting each inlet side opening and each outlet side opening can be reduced. Therefore, the valve body can be made small, and the main body can be downsized.

  A pilot pressure pattern switching valve for a hydraulic excavator according to a sixth aspect of the present invention includes a pilot chamber in each directional switching valve that controls each actuator of the arm cylinder and the swing motor of the hydraulic excavator, and a remote controller connected to each pilot chamber. A pilot pressure pattern switching valve of a hydraulic excavator that is provided between the pilot chamber and changes a connection pattern between each pilot chamber and each remote control valve, and is connected to one of each remote control valve or each pilot chamber. Each inlet, each remote control valve or each outlet connected to the other of the pilot chambers, each inlet port communicating with each inlet, and each outlet port communicating with each outlet. The main unit and the arm damper of the left front remote control valve and arm directional control valve that are linked to the forward operation of the left operation lever of the excavator A left rear remote control valve that is linked to the backward operation of the left operating lever and an arm excavation pilot chamber of the directional switching valve for the arm, and a right operation of the left operating lever. A left / right remote control valve and a left turning pilot of the turning direction switching valve are connected to the right / left turning pilot chamber for connecting the left / right remote control valve and the turning direction switching valve. A first switching position for connecting a chamber, connecting the left front remote control valve and the right turning pilot chamber, connecting the left rear remote control valve and the left turning pilot chamber, A valve body that connects the arm excavation pilot chamber and switches a connection pattern between a second switching position that connects the left-left remote control valve and the arm dump pilot chamber; The inlet ports are formed on the same surface on the main body side, and the valve body is formed on a valve body side surface that is in sliding contact with the main body side surface and can be connected to the inlet ports. An opening, each outlet side opening connectable with each outlet port, and a connection passage connecting each inlet side opening and each outlet side opening, and the body side surface and the valve body side So that the connection relationship between each inlet port and each inlet-side opening is the same at the first position and the second position. A recess is formed in at least one of the body-side surface and the valve-body-side surface, and the valve body rotates to establish a connection relationship between the inlet ports and the inlet-side openings. Without changing, the connection relationship between each outlet port and each outlet opening And the connection pattern is switched between the first switching position and the second switching position.

  According to this configuration, the connection relationship between each inlet port and each outlet port on the main body side and each inlet side opening and outlet side opening on the valve body side that can be connected to each is changed by rotation of the valve body. The connection pattern is switched. In switching between the first switching position and the second switching position for changing the pilot pressure pattern of the direction switching valve for the arm cylinder and the swing motor, the main body side surface and the valve body side surface that are in sliding contact with each other With the recess formed in at least one of these, the connection can be switched by changing only the connection relationship between each outlet port and each outlet-side opening without changing the connection relationship between each inlet port and each inlet-side opening. Thereby, the number of connection passages of the valve body for changing the pilot pressure pattern between the arm cylinder direction switching valve and the swing motor direction switching valve can be reduced. Therefore, the valve body can be made small, and the main body can be downsized.

  A pilot pressure pattern switching valve for a hydraulic excavator according to a seventh aspect of the present invention is the pilot pressure pattern switching valve according to the sixth aspect, wherein the respective inlet side openings are formed on the same circumference around the rotation axis. And

  According to this configuration, the openings on the inlet side are densely arranged on the same circumference, so that the interval between the connecting passages connected to the openings on the inlet side can be reduced. Thereby, a valve body can be made small and the size reduction of a main body can also be achieved.

  A pilot pressure pattern switching valve for a hydraulic excavator according to an eighth aspect of the present invention includes a pilot chamber in each direction switching valve that controls each actuator of a boom cylinder, an arm cylinder, a bucket cylinder, and a swing motor of the hydraulic excavator, and each pilot A pilot pressure pattern switching valve of a hydraulic excavator provided between each remote control valve connected to a chamber and changing a connection pattern between each pilot chamber and each remote control valve, each remote control valve or each Each inlet connected to one of the pilot chambers, each outlet connected to each of the remote control valves or the other of the pilot chambers, each inlet port communicating with each inlet, and each outlet communicating with each outlet The main body in which the port is formed, and the left front remote control linked to the front operation of the left operation lever of the excavator The valve and the arm dump pilot chamber of the arm direction switching valve are connected, and the left rear remote control valve interlocked with the rearward operation of the left operation lever and the arm excavation pilot chamber of the arm direction switching valve are connected. A left and right remote control valve interlocking with a leftward operation of the left operation lever, and a left and right remote control valve interlocking with a leftward operation of the left operation lever; Connecting the left turn pilot chamber of the turn direction switching valve, connecting the right front remote control valve interlocked with the forward operation of the right operation lever of the hydraulic excavator and the boom lowering pilot chamber of the boom direction change valve, Connect the right rear remote control valve, which is linked to the rearward operation of the right control lever, and the boom raising pilot chamber of the boom direction switching valve. A right and left remote control valve that moves and a bucket dump pilot chamber of the bucket direction switching valve are connected, and a right and left remote control valve that interlocks with a left direction operation of the right operation lever and a bucket excavation pilot chamber of the bucket direction switching valve The left front remote control valve and the boom lowering pilot chamber are connected, the left rear remote control valve and the boom raising pilot chamber are connected, the left and right remote control valves and the bucket A drilling pilot chamber is connected, the left left remote control valve and the bucket dump pilot chamber are connected, the right front remote control valve and the arm drilling pilot chamber are connected, the right rear remote control valve and the arm A dump pilot room is connected, the right / right remote control valve and the right turn pilot room are connected, the right / left remote control valve and the front A third switching position for connecting the left turn pilot chamber, or connecting the left front remote control valve and the boom lowering pilot chamber, connecting the left rear remote control valve and the boom raising pilot chamber, Connecting the left and right remote control valve and the bucket excavation pilot chamber, connecting the left left remote control valve and the bucket dump pilot chamber, connecting the right front remote control valve and the arm dump pilot chamber, A right rear remote control valve is connected to the arm excavation pilot chamber, the right right remote control valve is connected to the right turning pilot chamber, and the right left remote control valve is connected to the left turning pilot chamber. And a valve body that switches a connection pattern between at least one of the four switching positions, and each of the inlet ports is formed on the same surface on the main body side. Each of the outlet ports is formed on the same other surface on the main body side different from the surface on the main body side, and the valve body is formed on a surface on the valve body side that is in sliding contact with the surface on the main body side. Each inlet side opening connectable to the port, each outlet side opening formed on the other surface of the valve body that is in sliding contact with the other surface of the main body side and connectable to each outlet port, and each inlet side opening And a connection passage that connects each outlet side opening, and rotates about a rotation axis of the valve body that penetrates the surface on the main body side and the surface on the valve body side, and the outlet port And the other side of the main body side and the other side of the valve body side so that the connection relationship between the outlet side opening and the outlet side opening is the same at the first switching position and the third switching position or the fourth switching position. A recess is formed in at least one of the surfaces, and the valve body rotates to Without changing the connection relationship between each outlet port and each outlet side opening, the connection relationship between each inlet port and each inlet side opening is changed, and the first switching position and the third switching position or The connection pattern is switched between the fourth switching position and the fourth switching position.

  According to this configuration, the connection relationship between each inlet port and each outlet port on the main body side and each inlet side opening and outlet side opening on the valve body side that can be connected to each is changed by rotation of the valve body. The connection pattern is switched. In switching between the first switching position and the third or fourth switching position, each outlet is provided by a recess formed in at least one of the other surface on the main body side and the other surface on the valve body side that are in sliding contact with each other. Without changing the connection relationship between the port and each outlet side opening, the connection can be switched by changing only the connection relationship between each inlet port and each inlet side opening. Thereby, the number of connection passages of the valve body for changing the pilot pressure pattern can be reduced. Therefore, the valve body can be made small, and the main body can be downsized.

  A pilot pressure pattern switching valve of a hydraulic excavator according to a ninth aspect of the present invention is the invention according to any of the third, fourth, sixth, seventh, and eighth aspects, A pressure chamber is formed between the main body and the pressure chamber, and pressure oil is introduced into the pressure chamber so that the valve body side surface and the main body side surface are brought into pressure contact with each other.

  According to this configuration, the adhesion between the valve-side surface and the main-body-side surface can be easily ensured, and the inlet and the outlet can be reliably communicated in each connection pattern.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 20 illustrates a hydraulic circuit 101 of a hydraulic excavator in which the pilot pressure pattern switching valve 1 of the hydraulic excavator according to the present embodiment is used. FIG. 23 shows four operation patterns (relationships between the operation directions of the left and right operation levers 110a and 110b of the excavator and the control of the actuators (turn, arm, boom, bucket) of the excavator). Patterns (1) to (4)) are shown.

  20 and 23, the pilot pressure pattern switching valve 1 according to this embodiment includes a directional switching valve (106) that controls actuators of a boom cylinder 104, an arm cylinder 103, a bucket cylinder 105, and a swing motor 102 of a hydraulic excavator. , 107, 108, 109) in each pilot chamber (106a, 106b, 107a, 107b, 108a, 108b, 109a, 109b), and a left operation lever 110a and a right operation lever of a hydraulic excavator connected to each pilot chamber. And a remote control valve (not shown) linked to each operation of 110b. The connection pattern between each pilot room and each remote control valve is changed to four switching positions (first switching position S1 (first switching position S1), second switching position S2 (second switching position S2), and third switching position S3 (３ By switching at the switching position S3) and the fourth switching position S4 (丙 switching position S4)), four operation patterns (patterns (1) to (4)) are realized.

  The four connection patterns respectively connected by the four switching positions (S1 to S4) are switched by a valve body 3 provided in the pilot pressure pattern switching valve 1 as described later. Each of these connection patterns will be described with reference to FIGS.

  First, when switched to the first switching position S1, the left front remote control valve LF (not shown) interlocked with the forward operation of the left operation lever 110a and the arm dump pilot chamber 107b of the arm direction switching valve 107 are oil passages. The left rear remote control valve LB (not shown) that is connected via ad and linked to the rearward operation of the left operating lever and the arm excavation pilot chamber 107a of the arm direction switching valve 107 are connected via the oil passage ac. Is done. A left / right remote control valve LR (not shown) interlocked with the right direction operation of the left operation lever 110a and the right turning pilot chamber 106a of the turning direction switching valve 106 are connected via an oil passage sr. A left / left remote control valve LL (not shown) that is interlocked with the left direction operation of the operation lever 110a and a left turning pilot chamber 106b of the turning direction switching valve 106 are connected via an oil passage sl. Further, a right front remote control valve RF (not shown) interlocked with a forward operation of the right operation lever 110b of the hydraulic excavator and a boom lowering pilot chamber 108b of the boom direction switching valve 108 are connected via an oil passage bd. A right rear remote control valve RB (not shown) interlocked with the rearward operation of the right operation lever 110b and a boom raising pilot chamber 108a of the boom direction switching valve 108 are connected via an oil passage bu. Further, a right / right remote control valve RR (not shown) interlocked with a right operation of the right operation lever 110b and a bucket dump pilot chamber 109a of the bucket direction switching valve 109 are connected via an oil passage vd. A right / left remote control valve RL (not shown) interlocked with the left direction operation of the lever 110b and a bucket excavation pilot chamber 109b of the bucket direction switching valve 109 are connected via an oil passage vc. That is, the operation pattern is changed to the pattern (1) by switching to the first switching position S1.

  When switched to the second switching position S2, the left front remote control valve LF and the right turning pilot chamber 106a are connected via the oil passage sr, and the left rear remote control valve LB and the left turning pilot chamber 106b are oiled. The left and right remote control valve LR and the arm excavation pilot chamber 107a are connected via an oil passage ac, and the left and right remote control valve LL and the arm dump pilot chamber 107b are connected via an oil passage ad. Connected. The right front remote control valve RF and the boom lowering pilot chamber 108b are connected via an oil passage bd, and the right rear remote control valve RB and the boom raising pilot chamber 108a are connected via an oil passage bu. Valve RR and bucket dump pilot chamber 109a are connected via an oil passage vd, and right / left remote control valve RL and bucket excavation pilot chamber 109b are connected via an oil passage vc. That is, the operation pattern is changed to the pattern (2) by switching to the second switching position S2.

  When switched to the third switching position S3, the left front remote control valve LF and the boom lowering pilot chamber 108b are connected via the oil passage bd, and the left rear remote control valve LB and the boom raising pilot chamber 108a are connected to the oil passage. The left and right remote control valves LR and the bucket excavation pilot chamber 109b are connected via an oil passage vc, and the left / left remote control valve LL and the bucket dump pilot chamber 109a are connected via an oil passage vd. Is done. The right front remote control valve RF and the arm excavation pilot chamber 107a are connected via the oil passage ac, and the right rear remote control valve RB and the arm dump pilot chamber 107b are connected via the oil passage ad, and the right and right remote control. The valve RR and the right turning pilot chamber 106a are connected via an oil passage sr, and the right / left remote control valve RL and the left turning pilot chamber 106b are connected via an oil passage sl. That is, by switching to the third switching position S2, the operation pattern is changed to the pattern (3).

  When switched to the fourth switching position S4, the left front remote control valve LF and the boom lowering pilot chamber 108b are connected via the oil passage bd, and the left rear remote control valve LB and the boom raising pilot chamber 108a are connected to the oil passage. The left and right remote control valve LR and the bucket excavation pilot chamber 109b are connected via an oil passage bc, and the left and right remote control valve LL and the bucket dump pilot chamber 109a are connected via an oil passage vd. Is done. The right front remote control valve RF and the arm dump pilot chamber 107b are connected via an oil passage ad, the right rear remote control valve RB and the arm excavation pilot chamber 107a are connected via an oil passage ac, and the right and right remote control The valve RR and the right turning pilot chamber 106a are connected via an oil passage sr, and the right / left remote control valve RL and the left turning pilot chamber 106b are connected via an oil passage sl. That is, by switching to the fourth switching position S4, the operation pattern is changed to the pattern (4).

  Hereinafter, as described above, the pilot pressure pattern switching valve 1 (hereinafter simply referred to as “pattern”) for changing the connection pattern between each direction switching valve (106 to 109) of the hydraulic circuit 101 and each remote control valve (LF, RF,...). The configuration of the switching valve 1 ”) will be described in detail. 1 to 5 are a front view (FIG. 1), a top view (FIG. 2), a left side view (FIG. 3), a right side view (FIG. 4), and a rear view (FIG. 5) of the pilot pressure pattern switching valve 1. Respectively. FIG. 6 is a cross-sectional view taken along line XX in FIG.

  The pattern switching valve 1 is formed in a substantially square box shape. Then, as well shown in FIG. 6 (X-X arrow sectional view), the main body 2 composed of the entry block 2a and the exit block 2b is stored between the entrance block 2a and the exit block 2b. And a fixing means 4 for fixing the main body 2 to the direction switching valve of the hydraulic circuit 101.

  The pattern switching valve 1 is fixedly attached to the side surface of the bucket direction switching valve 109 (see FIG. 20). At this time, the connecting surface 5 of the outlet block 2b is attached so as to be in contact with the side surface of the bucket direction switching valve 109. And the fixing means 4 is comprised by the four volt | bolts 4 inserted in each through-hole drilled in the main body 2, as shown in FIGS. The bolt head 4a of each bolt 4 is embedded in the entry block 2a, and the screw end 4b of the bolt 4 protrudes from the connection surface 5 (see FIG. 6). The screw end 4 b is screwed to the bucket direction switching valve 109, whereby the main body 2 is connected to the bucket direction switching valve 109 via the connection surface 5.

  The inlet block 2a of the main body 2 is provided with inlets 6 (6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h) connected to the remote control valves (LF, RF,...). (See FIGS. 2 to 4). The inlets 6a to 6d are formed on the upper surface of the inlet block 2a, the inlets 6e and 6f are opened on the left side, and the inlets 6g and 6h are opened on the right side. The inlet 6a is connected to the left rear remote control valve LB, the inlet 6b is connected to the right left remote control valve RL, the inlet 6c is connected to the left left remote control valve LL, the inlet 6d is connected to the left front remote control valve LF, and the inlet 6e is left and right Connected to the remote control valve LR, the inlet 6f is connected to the right and right remote control valve RR, the inlet 6g is connected to the right rear remote control valve RB, and the inlet 6h is connected to the right front remote control valve RF. Incidentally, in FIGS. 2 to 4, the symbols (LF, RF,...) Of the corresponding remote control valves are attached in parentheses to the symbols (6a to h) of the respective inlets. In addition, the inlet 6i shown by FIG. 2 is an extraction port of the hydraulic signal of boom lowering pilot pressure.

  Further, the connection surface 5 of the outlet block 2b of the main body 2 is connected to each pilot chamber (106a, 106b, 107a,...) Via each oil passage (sr, sl, ac,...). An outlet 7 (7a, 7b, 7c, 7d, 7e, 7f, 7g, 7h) is provided (see FIG. 5). Each of these outlets 7 is formed at the connection surface 5 at the opening on the side of the direction switching valve communicating with each pilot chamber (that is, at the end opposite to each pilot chamber in each oil passage communicating with each pilot chamber). Formed at positions facing each other. Thereby, the outlet 7a is connected to the oil passage ac, the outlet 7b is connected to the oil passage vc, the outlet 7c is connected to the oil passage sl, the outlet 7d is connected to the oil passage ad, and the outlet 7e is connected to the oil passage sr. The outlet 7f is connected to the oil passage vd, the outlet 7g is connected to the oil passage bu, and the outlet 7h is connected to the oil passage bd. In addition, in FIG. 5, the code | symbol (sr, sl, ...) of a corresponding oil path is attached | subjected to the code | symbol (7a-h) of each exit in brackets. In this way, by forming the outlet connected to the pilot chamber at a position facing the opening on the side of the direction switching valve communicating with each pilot chamber on the connection surface 5, the pattern switching valve 1 is connected to the direction switching valve. Can be fixed directly. For this reason, piping and piping connection work for connecting the pilot pressure pattern switching valve and the direction switching valve can be omitted.

  Here, the position where each outlet 7 is formed will be further described. FIG. 21 shows a cross-sectional view of the bucket cylinder direction switching valve 109 corresponding to the position indicated by arrows Y-Y in FIG. The direction switching valve 109 switches the position of the spool 109c when pilot pressure oil is guided to the pilot chambers 109a and 109b, and communicates with the bucket cylinder via the spool hole 109d, the bridge passage 109e, and the tank communication passage 109h. The communication state of the port 109f, the supply passage 109g, and the tank passage 109i is switched. As shown in this figure, in this direction switching valve 109, oil passages (vc, vd, bu, bc, ac, ad, sr, sl) are formed substantially in parallel below the spool hole 109d. It is formed in a portion not surrounded by the spool hole 109d and the bridge passage 109e. Each of these oil passages opens from the side surface of the direction switching valve 109 in this positional relationship, and is connected to each outlet 7 of the main body 2 of the pattern switching valve 1 at the connection surface 5 (see FIG. 5). That is, each outlet 7 is opened at a position facing a portion of the direction switching valve 109 that is not surrounded by the spool hole 109d and the bridge passage 109e. As a result, the pilot chambers and the outlets can be connected without traversing the oil passages between the spool holes 109d and the bridge passages 109e. In addition, like the pattern switching valve 1 of this embodiment, it is preferable that each outlet 7 is opened at a position facing a portion not surrounded by the spool hole 109d and the tank communication path 109h.

  Further, the valve body 3 shown in FIG. 6 is disposed between the entry side block 2 a and the exit side block 2 b, and a rotating shaft 9 is attached via a key 8. By rotating the rotating shaft 9, the valve body 3 is rotated, and the connection relationship between each inlet 6 and each outlet 7 in the main body 2 is changed between the switching positions S1 to S4 as will be described later. Is done. As shown in FIGS. 1 and 6, the rotation shaft 9 is provided so as to protrude from the front of the entry side block 2 a and is attached to a disc-shaped positioning plate 10. That is, by rotating the rotation shaft 9, both the positioning plate 10 and the valve body 3 are rotated. The positioning plate 10 is formed with a long hole 10a through which the positioning bolt 11 for fixing the rotation position of the positioning plate 10 with respect to the main body 2 is inserted corresponding to each switching position S1 to S4. . FIG. 1 shows a state where the first switching position S1 is positioned (the rotation position is ± 0 °). When the valve body 3 is rotated 35 ° clockwise together with the positioning plate 10 from the first switching position S1 around the rotation axis 9, the second switching position S2 (rotation position is −35 °) is obtained. When it is rotated clockwise by 30 ° or 55 °, it becomes the third switching position S3 (the rotational position is + 30 °) or the fourth switching position S4 (the rotational position is + 55 °).

  Next, the internal structure of the main body 2 and the valve body 3 for switching the connection relationship between the respective inlets 6 and the respective outlets 7 will be described in detail with reference to cross-sectional views taken along arrows in FIGS. 6 and 7 to 11. To do. The description of the internal structure will be made with reference to the respective sectional views so as to sequentially shift from the left side to the right side in FIG.

  In the cross-sectional view taken along the line A-A in FIG. 7, the inlets 6 a to 6 h are formed as wide-opening recesses 12 a to 12 h, and the inlet oil passages 13 are respectively formed from the bottoms of the opening recesses 12 a to 12 h. (13a-13h) are perforated. That is, the inlet oil passage 13a from the inlet 6a, the inlet oil passage 13b from the inlet 6b, the inlet oil passage 13c from the inlet 6c, the inlet oil passage 13d from the inlet 6d, and the inlet oil passage 13e from the inlet 6e. However, an inlet oil passage 13f is formed from the inlet 6f, an inlet oil passage 13g is formed from the inlet 6g, and an inlet oil passage 13h is formed from the inlet 6h. The entry side block 2a has a main body side surface 14 (hereinafter also referred to as "main body side plane 14") facing the valve body 3 and through which the rotation shaft 9 passes (see FIG. 6). Each inlet oil passage 13 is extended to each inlet port 15 (15a, 15b, 15c, 15d, 15e, 15f, 15g, 15h) formed to open to the valve body 3 on the main body side plane 14. ing. That is, each inlet 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h is connected to each inlet port 15a, 15b, 15c, 15d, 15e, 15f, 15g, 15h via each inlet oil passage 13. Communicate. Only the inlets 6g and 6h communicate with the two inlet ports 15g (15g1, 15g2) and 15h (15h1, 15h2), respectively. Each inlet oil passage 13 is formed by drilling from the outside of the main body 2 so as to bend a predetermined number of times from each inlet 6 to each inlet port 15. An unnecessary opening to the outside generated during the processing is closed by the cap 16.

  Each inlet port 15 is disposed on a first circumference 17 centered on the rotation shaft 9 and on a second circumference 18 different from the first circumference 17 about the rotation shaft 9. (Both circumferences 17 and 18 are shown by a one-dot chain line in FIG. 6). Thereby, each inlet port 15 can be arranged densely, and size reduction of the pattern switching valve 1 can be achieved.

  In addition, on the first circumference 17, the inlet ports (15c, 15e, 15c, 15e, 15c, 15e, respectively) communicating with the remote control valves (LL, LR, RL, RR) interlocking with the left / right operation of the left operation lever 110a and the right operation lever 110b 15b, 15f) are arranged. On the second circumference 18, the respective inlet ports (15 d, 15 a, 15 h) communicated with the remote control valves (LF, LB, RF, RB) interlocking with the front / rear direction operation of the left / right operation levers (110 a, 110 b), respectively. 15g) is arranged. By arranging in this way, when switching between the operation pattern (1) and the operation pattern (3) or (4), that is, the first switching position S1 (the former switching position S1) and the third switching position S3 or When the connection pattern is changed with the fourth switching position S4 (丙 switching position S3 or S4), the respective inlet ports communicating with the respective remote control valves in a relationship in which the connection relation with each pilot chamber is exchanged, They are arranged on the same circumference 17 or 18 (see FIG. 23). For this reason, as will be described later, the switching structure by the rotation of the valve body 3 can be simplified, and the valve body 3 and the main body 2 can be downsized.

  Next, a connection configuration between the main body side plane 14 of the entry side block 2a and a valve pair side surface 19 (hereinafter also referred to as "valve element side plane 19") that is in sliding contact with the main body side plane 14 (see FIG. 6). Will be described. FIG. 12 shows a connection relationship when the valve body 3 is in the first switching position S1 (the rotation position is ± 0 ° in FIG. 1). 12 (b) shows the state of the main body side plane 14 seen through from the side opposite to the valve body 3 side, and FIG. 12 (c) shows the state of the valve body side plane 19 viewed from the entry side block 2a side. ) Schematically shows a state in which the main body side plane 14 and the valve body side plane 19 are superimposed.

  As shown in FIG. 12B, each inlet port 15 is opened on the first circumference 17 and the second circumference 18 in the main body side plane 14 (each inlet port 15 has the same surface). 14). Moreover, as shown in FIG.12 (c), on the 1st circumference 17 and the 2nd circumference 18 in the valve body side plane 19, it can connect with each inlet port 15 by becoming a predetermined | prescribed rotation position. Each inlet side opening 20 (20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h) is formed. Each inlet-side opening 20 is connected to an outlet port opening 24 that can be connected to the outlet port 28 of the block 2b that communicates with each outlet 7 of the outlet-side block 2b and each connection passage 23, as will be described later. Connected.

  Recesses 21 (21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h) are formed at the positions where the respective inlet ports 15 (15a to 15h) are formed on the main body side plane 14. Moreover, the recessed part 22 (22a, 22b, 22c, 22d, 22e, 22f, 22g, 22h) is formed in the location in which each inlet side opening 20 (20a-20h) in the valve body side plane 19 is formed. . Each of these recesses (21, 22) is formed in a groove shape partially along the first circumference 17 or the second circumference 18. The connection relationship between each inlet port 15 and each inlet-side opening 20 is such that the first switching position (state shown in FIG. 12, the rotation position is ± 0 ° in FIG. 1) and the second switching position (FIG. 1 in a state where the rotation position is −35 °).

  12A, the main body side plane 14 and the valve body side plane 19 are in contact with each other at the first switching position S1, and the respective inlet ports 15 on the main body 2 side and the respective inlet side openings 20 on the valve body 3 side are respectively A state of being connected through the recesses (21, 22) is shown. That is, in the first switching position S1, the inlet ports 15a, 15b, 15c, 15d, 15e, 15f, 15g, and 15h are connected to the inlet side openings 20a, 20b, 20c, 20d, 20e, 20f, 20g, and 20h, respectively. Has been.

  Next, in the cross-sectional view taken along the line B-B in FIG. 8, the connection passages 23 (23 a to 23 h) are arranged in the direction of the rotation axis 9 on the first circumference 17 and the second circumference 18 of the valve body 3. The state of penetration is shown. The connecting passage 23a communicates with the inlet side opening 20a, the connecting passage 23b communicates with the inlet side opening 20b, the connecting passage 23c communicates with the inlet side opening 20c, the connecting passage 23d communicates with the inlet side opening 20d, and the connecting passage 23e communicates with the inlet opening 20e, the connection passage 23f communicates with the inlet opening 20f, the connection passage 23g communicates with the inlet opening 20g, and the connection passage 23h communicates with the inlet opening 20h (FIG. 12). (See (c)). In addition, since each inlet side opening 20 is formed so as to be positioned on the same circumference (17 or 18) with the rotation shaft 9 as the center, these inlets can be arranged densely. The interval between the connection passages 23 connected to the side opening 20 can be reduced. Therefore, the valve body 3 can be made small and the main body 2 can be downsized.

  The connection passage 23b is formed to be deflected substantially at right angles in the cross-sectional view taken along the line B-B, and at the outlet side opening 24b, the main body side inner peripheral surface 26 (the main body side different from the main body side surface 14). In the valve body side outer peripheral surface 27 (sliding contact with the other surface 26 of the main body side) 27 is formed in a recess 25b formed with respect to the valve body side outer peripheral surface 27. The recess 25b is formed in a groove shape along a part of the circumferential direction of the valve-body-side outer peripheral surface 27, and is open to the main-body-side inner peripheral surface 26 when in the first switching position S1 shown in FIG. The outlet port 28b and the outlet side opening 24b communicated with each other. The outlet port 28b communicates with the outlet 7b through the outlet oil passage 29b (see FIG. 5). In FIG. 8, the fact that the outlet oil passage 29b communicates with the outlet 7b is indicated by reference numerals in parentheses. Further, the connection passage 23f opens to a recess 25f formed in the valve body side outer peripheral surface 27 at the outlet side opening 24f. The recess 25f is also formed in a groove shape partially along the circumferential direction of the valve-body-side outer peripheral surface 27, and the outlet port 28f and the outlet-side opening 24f are in communication with each other at the first switching position S1. The outlet port 28f communicates with the outlet 7f via the outlet oil passage 29f (see FIG. 5). In addition, since the recesses 25b and 25f are formed in the valve body side outer peripheral surface 27, it can process easily.

  In the cross-sectional view taken along the line CC in FIG. 9, the connection passage 23a opens to a recess 25a provided on the valve body side outer peripheral surface 27 at the outlet side opening 24a. The outlet side opening 24a and the outlet port 28a communicate with each other through the recess 25a, and the outlet port 28a communicates with the outlet 7a through the outlet oil passage 29a. Similarly, the connection passage 23c opens at the outlet side opening 24c with respect to the recess 25c, the outlet side opening 24c and the outlet port 28c communicate with each other through the recess 25c, and the outlet through the outlet oil passage 29c. The side opening 28c and the outlet 7c communicate with each other. The connection passage 23d opens to the recess 25d at the outlet side opening 24d, the outlet side opening 24d and the outlet port 28d communicate with each other through the recess 25d, and the outlet side through the outlet oil passage 29d. The opening 28d communicates with the outlet 7d. The connection passage 23e opens at the outlet side opening 24e with respect to the recess 25e, the outlet side opening 24e communicates with the outlet port 28e through the recess 25e, and the outlet side through the outlet oil passage 29e. The opening 28e communicates with the outlet 7e.

  In the sectional view taken along the line D-D in FIG. 10, the connection passage 23g opens at the outlet side opening 24g with respect to the recess 25g, and the outlet side opening 24g and the outlet port 28g communicate with each other through the recess 25g. The outlet opening 28g and the outlet 7g communicate with each other through the outlet oil passage 29g. The connection passage 23h opens to the recess 25h at the outlet side opening 24h, the outlet side opening 24h communicates with the outlet port 28h via the recess 25h, and the outlet side via the outlet oil passage 29h. The opening 28h communicates with the outlet 7h. The outlet oil passage 29h is also connected to the spare inlet 6i.

  In the cross-sectional view taken along the line E-E in FIG. 11 which is the last cross-sectional view, each outlet oil passage 29 (29a to 29h) is extended in parallel to each outlet 7 (7a to 7h). Has been. In the connection relationship between each outlet port 28 and each outlet side opening 24 described above, each recess 25 has a third switching position (the rotation position is + 30 ° in FIG. 1) and a fourth switching position. It is formed to have a length along the circumferential direction of the valve-body-side outer circumferential surface 27 so as to be the same at the switching position (the rotation position is + 55 ° in FIG. 1).

  As described above with reference to the sectional views and the like, in the main body 2, the inlets 6a to 6h communicate with the inlet ports 15a to 15h, respectively, and the outlets 7a to 7h correspond to the outlet ports 28a to 28h, respectively. Each communicates. In the valve body 3, each inlet side opening 20a-20h and each outlet side opening 24a-24h are connected via each connection passage 23a-23h. And in the 1st switching position S1 demonstrated above, each inlet port 15a-15h of the main body 2 is each inlet side opening 20a-20h of the valve body 3, and each outlet port 28a-28h of the main body 2 is the valve body 3. The respective outlet openings 24a to 24h communicate with each other. Accordingly, in this case, each of the inlets 6a, 6b, 6c, 6d, 6e, 6f, 6g, and 6h is connected to each of the outlets 7a, 7b, 7c, 7d, 7e, 7f, 7g, and 7h.

  Moreover, as shown in FIG. 6, the pressure chamber 33 is formed between the main body 2 (exit side block 2b) and the plane 32 on the opposite side to the valve body side plane 19 in the valve body 3. As shown in FIG. The valve body 3 is supported so as to be slidable in the axial direction of the rotary shaft 9 between the entry side block 2a and the exit side block 2b, and the pressure oil is introduced into the pressure chamber 33, The body side plane 19 and the main body side plane 14 are configured to be press-contactable. That is, a pressure contact pump port 31 communicating with a pump Pp (not shown) for supplying pressure oil via a direction switching valve of the hydraulic circuit 101 is formed on the connection surface 5 of the outlet block 2b. (See FIG. 5) From here, the pressure oil can be introduced into the pressure chamber 33 through the oil passage 34 and the pressure chamber side opening 35 (see FIGS. 6 and 11). Thereby, the adhesiveness of the valve body side plane 19 and the main body side plane 14 can be easily ensured, and each inlet port 15 and each inlet side opening 20 are reliably communicated at each switching position (S1 to S4). Can be made. Further, the pressure chamber 37 defined by the valve body 3, the main body 2 (exit side block 2b), and the rotary shaft 9 is a tank port 30 (see FIGS. 5, 6, and 11) formed in the oil passage 36 and the connection surface 5. ) To communicate with a tank (not shown). Thereby, the oil leaked from the inlet port 15 can return to the tank.

  Finally, referring to FIGS. 12 to 19 and the like, each connection configuration of the main body 2 and the valve body 3 at the first to fourth switching positions (S1 to S4) established by rotating the rotating shaft 9. explain. 12 and 13 show the connection state at the first switching position S1 (the rotational position is ± 0 ° in FIG. 1), and FIGS. 14 and 15 show the second switching position S2 (the rotational position in FIG. 1). 16 and FIG. 17 show the connection state in the third switching position S3 (the rotation position is + 30 ° in FIG. 1), and FIGS. 18 and 19 show the connection state in the fourth switching state. The connection states at the switching position S4 (the rotation position in FIG. 1 is + 55 °) are shown. 12, 14, 16, and 18 show the connection state between each inlet port 15 and each inlet-side opening 20, and FIGS. 13, 15, 17, and 19 show the connection state between each outlet-side opening 24 and each outlet port 28. Indicates. 12 (b), 14 (b), 16 (b), and 18 (b) show the state of the main body side plane 14 seen through from the side opposite to the valve body 3 side, as shown in FIG. 14 (c), 16 (c) and 18 (c) show the state of the valve element side plane 19 as viewed from the entry block 2a side, as shown in FIGS. 12 (a), 14 (a) and 16 (a). FIG. 18A shows a state in which the main body side plane 14 and the valve body side plane 19 are overlapped with each other. 13 (a), 15 (a), 17 (a), and 19 (a) show the valve body 3 and its surroundings corresponding to the cross-sectional view taken along the line B-B, and FIGS. FIGS. 13 (c), 15 (c), 17 (c), 19 (b) show the valve body 3 and its periphery corresponding to the sectional view taken along the line C-C. c) shows the valve body 3 and its surroundings corresponding to the sectional view taken along the line D-D.

  First, at the first switching position S1 (FIGS. 12 and 13), as described above, the respective inlet ports 15a to 15h are respectively connected to the respective inlet side openings 20a to 20h, and the respective outlet side openings 24a to 24h are respectively connected to the respective outlet ports. 28a to 28h. Thereby, each inlet 6a-6h is each connected with each outlet 7a-7h (refer FIG. 5, 7-13), and operation pattern (1) is materialized.

  Next, at the second switching position S2 (FIGS. 14 and 15), the valve body 3 rotates from the first switching position S1 by -35 ° (35 ° clockwise in FIG. 1) about the rotation shaft 9. Is switched. In FIG. 14, the position of the main body side plane 14 is indicated by a thin alternate long and short dash line, and the position of the valve element side plane 19 is indicated by a thick alternate long and short dash line. ° In the rotated position. In this second switching position S2, as shown in FIG. 14, the respective inlet ports 15a, 15b, 15c, 15d, 15e, 15f, 15g2, 15h1 are respectively connected to the respective recesses 21a, 21b, 21c, 21d, 21e, 21f. , 21g, 21h and the respective recesses 22a, 22b, 22c, 22d, 22e, 22f, 22g, 22h, connected to the respective inlet side openings 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, respectively. Has been. That is, the respective recesses 21 formed in the main body side plane 14 and the respective recesses 22 formed in the valve body side plane 19 each have a predetermined length, so that the first switching position S1 and the second switching position S2 The connection relationship between each inlet port 15 and each inlet-side opening 20 is kept the same.

  The connection relationship between each outlet side opening 24 and each outlet port 28 is shown in FIG. That is, the outlet side opening 24b is connected to the outlet port 28b, and the outlet side opening 24f is connected to the outlet port 29f (see FIG. 15A). The outlet side opening 24a is connected to the outlet port 29c, the outlet side opening 24c is connected to the outlet port 28d, the outlet side opening 24d is connected to the outlet port 28e, and the outlet side opening 24e is connected to the outlet port 29a (see FIG. 15B). . The outlet side opening 24g is connected to the outlet port 29g, and the outlet side opening 24h is connected to the outlet port 28h (see FIG. 15C).

  Therefore, when switching from the first switching position S1 to the second switching position S2, the inlet 6a is the outlet 7c, the inlet 6b is the outlet 7b, the inlet 6c is the outlet 7d, the inlet 6d is the outlet 7e, and the inlet 6e is the outlet 7a. The inlet 6f is connected to the outlet 7f, the inlet 6g is connected to the outlet 7g, and the inlet 6h is connected to the outlet 7h (see FIGS. 5, 7 to 11, 14, and 15). Thereby, the operation pattern (2) is switched. As described above, the valve body 3 is rotated, so that the connection relationship between each outlet port 28 and each outlet opening 24 is changed without changing the connection relationship between each inlet port 15 and each inlet side opening 20. Then, the connection pattern is switched between the first switching position (the former switching position) S1 and the second switching position (the second switching position) S2. With this configuration, the number of connection passages of the valve body 3 for changing the pilot pressure pattern between the arm cylinder direction switching valve 107 and the swing motor direction switching valve 106 can be reduced. Therefore, the valve body 3 can be made small, and the main body 2 can be downsized.

  Next, at the third switching position S3 (FIGS. 16 and 17), the valve body 3 rotates from the first switching position S1 by + 30 ° (30 ° counterclockwise in FIG. 1) about the rotation shaft 9. Is switched. In FIG. 16, the position of the main body side plane 14 is indicated by a thin alternate long and short dash line, and the position of the valve element side plane 19 is indicated by a thick alternate long and short dash line. ° In the rotated position. In this third switching position S3, as shown in FIG. 16, the respective inlet ports 15a, 15b, 15c, 15d, 15e, 15f, 15g1, 15h2 are respectively connected to the respective recesses 21a, 21b, 21c, 21d, 21e, 21f. , 21g, 21h and the respective recesses 22g, 22c, 22f, 22h, 22b, 22e, 22a, 22d, connected to the respective inlet side openings 20g, 20c, 20f, 20h, 20b, 20e, 20a, 20d, respectively. Has been.

  The connection relationship between each outlet side opening 24 and each outlet port 28 is shown in FIG. That is, the outlet side opening 24b is connected to the outlet port 28b via the recess 25b, and the outlet side opening 24f is connected to the outlet port 29f via the recess 25f (see FIG. 17A). The outlet side opening 24a is connected to the outlet port 29a via the recess 25a, the outlet side opening 24c is connected to the outlet port 28c via the recess 25c, and the outlet side opening 24d is connected to the outlet port 28d via the recess 25d. The opening 24e is connected to the outlet port 29e through the recess 25e (see FIG. 17B). The outlet side opening 24g is connected to the outlet port 29g via the recess 25g, and the outlet side opening 24h is connected to the outlet port 28h via the recess 25h (see FIG. 17C). That is, each recess 25 formed in the valve body side outer peripheral surface 27 has a predetermined length along the circumferential direction of the valve body side outer peripheral surface 27, so that the first switching position S1 and the third switching position S3 The connection relationship between each outlet opening 24 and each outlet port 28 is kept the same.

  Therefore, when switching from the first switching position S1 to the second switching position S2, the inlet 6a is the outlet 7g, the inlet 6b is the outlet 7c, the inlet 6c is the outlet 7f, the inlet 6d is the outlet 7h, and the inlet 6e is the outlet 7b. The inlet 6f is connected to the outlet 7e, the inlet 6g is connected to the outlet 7a, and the inlet 6h is connected to the outlet 7d (see FIGS. 5, 7 to 11, 16, and 17). As a result, the operation pattern (3) is switched. Thus, the valve body 3 is rotated, so that the connection relationship between each inlet port 15 and each inlet side opening 20 is changed without changing the connection relationship between each outlet side opening 24 and each outlet port 28. Then, the connection pattern is switched between the first switching position (the former switching position) S1 and the third switching position (the heel switching position) S3. With this configuration, the number of connection passages of the valve body 3 can be reduced, the valve body 3 can be made smaller, and the main body 2 can be downsized.

  Finally, at the fourth switching position S4 (FIGS. 18 and 19), the valve body 3 rotates from the first switching position S1 about the rotation axis 9 by + 55 ° (55 ° counterclockwise in FIG. 1). Is switched. In FIG. 18, the position of the main body side plane 14 is indicated by a thin alternate long and short dash line, and the position of the valve body side plane 19 is indicated by a thick alternate long and short dash line. ° In the rotated position. In the fourth switching position S4, as shown in FIG. 18, the inlet ports 15a, 15b, 15c, 15d, 15e, 15f, 15g2, 15h1 are respectively connected to the recesses 21a, 21b, 21c, 21d, 21e, 21f. , 21g, 21h and the respective recesses 22g, 22c, 22f, 22h, 22b, 22e, 22d, 22a, connected to the respective inlet side openings 20g, 20c, 20f, 20h, 20b, 20e, 20d, 20a, respectively. Has been.

  The connection relationship between each outlet side opening 24 and each outlet port 28 is shown in FIG. That is, the outlet side opening 24b is connected to the outlet port 28b via the recess 25b, and the outlet side opening 24f is connected to the outlet port 29f via the recess 25f (see FIG. 17A). The outlet side opening 24a is connected to the outlet port 29a via the recess 25a, the outlet side opening 24c is connected to the outlet port 28c via the recess 25c, and the outlet side opening 24d is connected to the outlet port 28d via the recess 25d. The opening 24e is connected to the outlet port 29e through the recess 25e (see FIG. 17B). The outlet side opening 24g is connected to the outlet port 29g via the recess 25g, and the outlet side opening 24h is connected to the outlet port 28h via the recess 25h (see FIG. 17C). That is, each recess 25 formed in the valve body side outer circumferential surface 27 has a predetermined length along the circumferential direction of the valve body side outer circumferential surface 27, so that the first switching position S1 and the fourth switching position S4 The connection relationship between each outlet opening 24 and each outlet port 28 is kept the same.

  Therefore, when switching from the first switching position S1 to the second switching position S2, the inlet 6a is the outlet 7g, the inlet 6b is the outlet 7c, the inlet 6c is the outlet 7f, the inlet 6d is the outlet 7h, and the inlet 6e is the outlet 7b. The inlet 6f is connected to the outlet 7e, the inlet 6g is connected to the outlet 7d, and the inlet 6h is connected to the outlet 7a (see FIGS. 5, 7 to 11, 18, and 19). Thus, the operation pattern (4) is switched. Thus, the valve body 3 is rotated, so that the connection relationship between each inlet port 15 and each inlet side opening 20 is changed without changing the connection relationship between each outlet side opening 24 and each outlet port 28. Then, the connection pattern is switched between the first switching position (the former switching position) S1 and the fourth switching position (the heel switching position) S4. With this configuration, the number of connection passages of the valve body 3 can be reduced, the valve body 3 can be made smaller, and the main body 2 can be downsized.

  As described above, according to the present embodiment, it is possible to provide a pilot pressure pattern switching valve for a hydraulic excavator that can omit piping for connecting the pilot pressure pattern switching valve and the direction switching valve and pipe connection work. Further, it is possible to provide a pilot pressure pattern switching valve for a hydraulic excavator that can be reduced in size.

  In addition, embodiment is not limited above, For example, you may change as follows.

  (1) As shown in the present embodiment, it is preferable that all the outlets 7a to 7h are open in the connection surface 5, but this need not necessarily be the case, and only one outlet is open. Even so, the effects of the present invention can be achieved.

  (2) In the present embodiment, although the outlet 7 is opened at a position facing the portion of the direction switching valve 109 that is not surrounded by the spool hole 109d and the bridge passage 109e (FIG. 21). This is not necessarily the case. That is, you may open in the position facing the part enclosed by the spool hole 109d and the bridge channel | path 109e. FIG. 22 shows a cross-sectional view of the direction switching valve 109 provided with each oil passage (sr, sl, ac,...) Corresponding to the opening position of the outlet 7 in this case. Thus, even if the outlet 7 is opened at a position facing the portion surrounded by the spool hole 109d and the bridge passage 109e, each oil passage in the spool (the oil passage not having the spool 109c in FIG. 22). Each pilot room can be connected via vc and vd). In this case, an increase in the end face seal can be suppressed.

  (3) In this embodiment, each inlet port is located on the main body side plane 14, but it does not necessarily have to be located on the plane. That is, even if it is formed on a spherical surface or a peripheral surface, the effects of the present invention can be achieved. In addition, when each inlet port is provided on a plane, since the space | interval of each connection channel | path in a valve body can be made small, it is desirable.

  (4) In this embodiment, each inlet is connected to each remote control valve and each outlet is connected to each pilot chamber. However, each inlet is connected to each pilot chamber and each outlet is connected to each remote control valve. Even if it does, the effect of this invention can be show | played.

  According to the first invention, the pilot pressure pattern switching valve is formed by forming the outlet connected to the pilot chamber at a position facing the opening on the side of the direction switching valve communicating with the pilot chamber on the connection surface contacting the direction switching valve. Can be directly fixed to the direction switching valve. For this reason, piping and piping connection work for connecting the pilot pressure pattern switching valve and the direction switching valve can be omitted.

  According to the second invention, the outlet connected to the pilot chamber opens at a position facing the portion of the direction switching valve that is not surrounded by the spool hole and the bridge passage. It is possible to connect the pilot room and the outlet without traversing. For this reason, the structure of the direction switching valve side can be simplified.

  According to the third aspect of the invention, each inlet port on the main body side that opens with respect to the valve body that rotates and changes the connection relation between the inlet and the outlet of the main body is divided into two Since it arrange | positions on a periphery, each inlet port can be arranged closely. Therefore, the main body can be made small, and the pilot pressure pattern switching valve can be miniaturized.

  According to the fourth aspect of the present invention, in connection pattern switching, the inlet ports communicating with the remote control valves that are connected to each pilot chamber are exchanged, with the same rotation center of the valve body as the center. Therefore, the switching structure by turning the valve body can be simplified. Thereby, a valve body can be made small and size reduction of a main body can also be achieved.

  According to the fifth aspect of the present invention, the connection pattern is switched by changing the connection relationship between each inlet port and each outlet port on the main body side and each inlet-side opening and outlet-side opening on the valve body side that can be connected to each. . When there are at least three types of changeable connection patterns, switching between the upper switching position and the second switching position is performed by changing only the connection relationship between each outlet port and the outlet side opening. Switching between the position and the heel switching position is performed by changing only the connection relationship between each inlet port and the inlet side opening. Thereby, the number of connection passages of the valve body connecting each inlet side opening and each outlet side opening can be reduced. Therefore, the valve body can be made small, and the main body can be downsized.

  According to the sixth aspect of the present invention, the connection relationship between each inlet port and each outlet port on the main body side and each inlet side opening and outlet side opening on the valve body side connectable to each by rotation of the valve body. The connection pattern can be switched by changing. In switching between the first switching position and the second switching position for changing the pilot pressure pattern of the direction switching valve for the arm cylinder and the swing motor, the main body side surface and the valve body side surface that are in sliding contact with each other With the recess formed in at least one of these, the connection can be switched by changing only the connection relationship between each outlet port and each outlet-side opening without changing the connection relationship between each inlet port and each inlet-side opening. Thereby, the number of connection passages of the valve body for changing the pilot pressure pattern between the arm cylinder direction switching valve and the swing motor direction switching valve can be reduced. Therefore, the valve body can be made small, and the main body can be downsized.

  According to the seventh invention, the openings on the inlet side are arranged close together on the same circumference, so that the interval between the connecting passages connected to the openings on the inlet side can be reduced. Thereby, a valve body can be made small and the size reduction of a main body can also be achieved.

  According to the eighth aspect of the present invention, the connection relationship between each inlet port and each outlet port on the main body side and each inlet side opening and outlet side opening on the valve body side that can be connected to each by rotation of the valve body. The connection pattern can be switched by changing. In switching between the first switching position and the third or fourth switching position, each outlet is provided by a recess formed in at least one of the other surface on the main body side and the other surface on the valve body side that are in sliding contact with each other. Without changing the connection relationship between the port and each outlet side opening, the connection can be switched by changing only the connection relationship between each inlet port and each inlet side opening. Thereby, the number of connection passages of the valve body for changing the pilot pressure pattern can be reduced. Therefore, the valve body can be made small, and the main body can be downsized.

  According to the ninth aspect, the adhesion between the valve body side surface and the main body side surface can be easily ensured, and the inlet and the outlet can be reliably communicated in each connection pattern.

It is a front view of the pilot pressure pattern switching valve concerning this embodiment. It is a top view of the pilot pressure pattern switching valve according to the present embodiment. It is a left view of the pilot pressure pattern switching valve concerning this embodiment. It is a right view of the pilot pressure pattern switching valve concerning this embodiment. It is a rear view of the pilot pressure pattern switching valve concerning this embodiment. FIG. 2 is a cross-sectional view taken along line XX in FIG. 1. It is an AA arrow directional cross-sectional view in FIG. FIG. 7 is a cross-sectional view taken along line B-B in FIG. 6. It is CC sectional view taken on the line in FIG. It is DD sectional view taken on the line in FIG. It is the EE arrow directional cross-sectional view in FIG. It is a figure explaining the connection state of each inlet port and each inlet side opening in a 1st switching position. It is a figure explaining the connection state of each exit side opening and each exit port in a 1st switching position. It is a figure explaining the connection state of each inlet port and each inlet side opening in a 2nd switching position. It is a figure explaining the connection state of each exit side opening and each exit port in a 2nd switching position. It is a figure explaining the connection state of each inlet port and each inlet side opening in a 3rd switching position. It is a figure explaining the connection state of each exit side opening and each exit port in a 3rd switching position. It is a figure explaining the connection state of each inlet port and each inlet side opening in a 4th switching position. It is a figure explaining the connection state of each exit side opening and each exit port in a 4th switching position. 1 is a hydraulic circuit diagram of a hydraulic excavator in which a pilot pressure pattern switching valve according to the present embodiment is used. It is sectional drawing of the direction switching valve for bucket cylinders equivalent to the YY arrow position in FIG. It is a figure explaining the modification of the pilot pressure pattern switching valve concerning this embodiment, Comprising: Sectional drawing of the bucket cylinder direction switching valve corresponding to a modification is shown. 4 shows four operation patterns that are relationships between the operation directions of the left and right operation levers of the excavator and the control of the actuators of the excavator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pilot pressure pattern switching valve 2 Main body 3 Valve body 4 Fixing means 5 Connection surface 6, 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h Inlet 7, 7a, 7b, 7c, 7d, 7e, 7f, 7g 7h Outlet 102, 103, 104, 105 Actuator 106, 107, 108, 109 Directional switching valve 106a, 106b, 107a, 107b, 108a, 108b, 109a, 109b Pilot chambers LF, LB, LR, LL, RF, RB, RR, RL remote control valve

Claims (7)

A connection pattern between each pilot chamber and each remote control valve provided between each pilot chamber in each direction switching valve that controls each actuator of the hydraulic excavator and each remote control valve connected to each pilot chamber. A pilot pressure pattern switching valve of a hydraulic excavator that changes
A main body in which each inlet connected to one of each remote control valve or each pilot chamber and each outlet connected to the other one of each remote control valve or each pilot chamber is rotated. And a valve body for changing the connection relationship between each inlet and each outlet,
Each inlet communicates with each inlet port formed so as to open with respect to the valve body on the surface on the main body side through which the rotation shaft of the valve body passes, and each inlet port is connected to the rotation port. A hydraulic excavator formed so as to be disposed on a first circumference centered on a moving shaft and on a second circumference centered on the rotating shaft and different from the first circumference. Pilot pressure pattern switching valve.   The inlet ports communicating with the remote control valve interlocked with the left and right operation levers of the hydraulic excavator are arranged on the first circumference, and the left and right sides are arranged on the second circumference. 2. The pilot pressure pattern switching valve for a hydraulic excavator according to claim 1, wherein each of the inlet ports communicating with a remote control valve interlocked with the operation of the operation lever in the front-rear direction is disposed. Provided between each pilot chamber in each direction switching valve for controlling each actuator of the boom cylinder, arm cylinder, bucket cylinder, and swing motor of the hydraulic excavator, and each remote control valve connected to each pilot chamber, A pilot pressure pattern switching valve of a hydraulic excavator that changes a connection pattern between each pilot chamber and each remote control valve,
Each inlet connected to one of each remote control valve or each pilot chamber, each outlet connected to the other of each remote control valve or each pilot chamber, each inlet port communicating with each inlet, A main body formed with each outlet port communicating with each outlet;
A valve having each inlet-side opening connectable to each inlet port; each outlet-side opening connectable to each outlet port; and a connection passage connecting each inlet-side opening and each outlet-side opening. With body,
The pilot pressure pattern switching valve has at least three types of changeable connection patterns of a former switching position, a second switching position, and a heel switching position,
Without changing the connection relationship between each inlet port and each inlet side opening, by changing the connection relationship between each outlet port and each outlet side opening, the upper switching position and the second switching position, Without changing the connection relationship between each outlet port and each outlet-side opening, by changing the connection relationship between each inlet port and each inlet-side opening, A pilot pressure pattern switching valve for a hydraulic excavator, wherein a connection pattern is switched between an upper switching position and the heel switching position. Provided between each pilot chamber in each directional switching valve that controls each actuator of the arm cylinder of the hydraulic excavator and each swing motor, and a remote control valve connected to each pilot chamber. A pilot pressure pattern switching valve for a hydraulic excavator that changes a connection pattern with the valve,
Each inlet connected to one of each remote control valve or each pilot chamber, each outlet connected to the other of each remote control valve or each pilot chamber, each inlet port communicating with each inlet, A main body formed with each outlet port communicating with each outlet;
Connect the left front remote control valve linked to the forward operation of the left operation lever of the hydraulic excavator and the arm dump pilot chamber of the arm direction switching valve,
Connecting the left rear remote control valve interlocked with the rearward operation of the left operating lever and the arm digging pilot chamber of the arm direction switching valve;
Connecting a left and right remote control valve interlocked with the right operation of the left operation lever and a right turning pilot chamber of the turning direction switching valve;
A first switching position for connecting a left-left remote control valve that is linked to a left-direction operation of the left-side operation lever and a left-turning pilot chamber of the turning-direction switching valve;
Connecting the left front remote control valve and the right turn pilot chamber;
Connecting the left rear remote control valve and the left turn pilot chamber;
Connecting the left and right remote control valve and the pilot chamber for arm excavation;
A valve body for switching a connection pattern between the left and right remote control valve and a second switching position for connecting the arm dump pilot chamber;
Each of the inlet ports is formed on the same surface on the main body side,
The valve body is formed on a valve body side surface that is slidably contacted with the surface on the main body side, each inlet side opening that can be connected to each inlet port, each outlet side opening that can be connected to each outlet port, and A connecting passage connecting each inlet side opening and each outlet side opening, and rotating about a rotation axis of the valve body penetrating the main body side surface and the valve body side surface. ,
A recess with respect to at least one of the body-side surface and the valve-body-side surface so that the connection relationship between each inlet port and each inlet-side opening is the same at the first position and the second position. And the connection relation between each outlet port and each outlet side opening without changing the connection relation between each inlet port and each inlet side opening by rotating the valve body. The pilot pressure pattern switching valve of the hydraulic excavator is characterized in that the connection pattern is switched between the first switching position and the second switching position.   5. The pilot pressure pattern switching valve for a hydraulic excavator according to claim 4, wherein each of the inlet side openings is formed on the same circumference around the rotation axis. Provided between each pilot chamber in each direction switching valve for controlling each actuator of the boom cylinder, arm cylinder, bucket cylinder, and swing motor of the hydraulic excavator, and each remote control valve connected to each pilot chamber, A pilot pressure pattern switching valve of a hydraulic excavator that changes a connection pattern between each pilot chamber and each remote control valve,
Each inlet connected to one of each remote control valve or each pilot chamber, each outlet connected to the other of each remote control valve or each pilot chamber, each inlet port communicating with each inlet, A main body formed with each outlet port communicating with each outlet;
Connect the left front remote control valve linked to the forward operation of the left operation lever of the hydraulic excavator and the arm dump pilot chamber of the arm direction switching valve,
Connecting the left rear remote control valve interlocked with the rearward operation of the left operating lever and the arm digging pilot chamber of the arm direction switching valve;
Connecting a left and right remote control valve interlocked with the right operation of the left operation lever and a right turning pilot chamber of the turning direction switching valve;
Connecting a left-left remote control valve interlocked with left-handed operation of the left-hand control lever and a left-turning pilot chamber of the turning-direction switching valve;
Connect the right front remote control valve linked to the forward operation of the right operation lever of the hydraulic excavator and the boom lowering pilot chamber of the boom direction switching valve,
Connecting the right rear remote control valve interlocked with the rearward operation of the right operation lever and the boom raising pilot chamber of the boom direction switching valve;
Connecting a right / right remote control valve interlocked with the right direction operation of the right side control lever and a bucket dump pilot chamber of the bucket direction switching valve;
A first switching position for connecting a right / left remote control valve interlocked with a left direction operation of the right side control lever and a bucket excavation pilot chamber of the bucket direction switching valve;
Connecting the left front remote control valve and the pilot room for lowering the boom,
Connecting the left rear remote control valve and the boom raising pilot chamber;
Connecting the left and right remote control valve and the bucket excavation pilot chamber;
Connect the left and right remote control valve and the bucket dump pilot room,
Connecting the right front remote control valve and the pilot chamber for arm excavation;
Connect the right rear remote control valve and the arm dump pilot room,
Connecting the right-right remote control valve and the pilot chamber for right turn,
A third switching position for connecting the right-left remote control valve and the left-turn pilot chamber, or
Connecting the left front remote control valve and the pilot room for lowering the boom,
Connecting the left rear remote control valve and the boom raising pilot chamber;
Connecting the left and right remote control valve and the bucket excavation pilot chamber;
Connect the left and right remote control valve and the bucket dump pilot room,
Connect the right front remote control valve and the arm dump pilot room,
Connecting the right rear remote control valve and the pilot chamber for arm excavation;
Connecting the right-right remote control valve and the pilot chamber for right turn,
A valve body for switching a connection pattern between at least one of the fourth switching positions connecting the right / left remote control valve and the pilot chamber for turning left, and
Each of the inlet ports is formed on the same surface on the main body side,
Each outlet port is formed on the same other surface on the main body side different from the surface on the main body side,
The valve body is formed on a valve body side surface that is in sliding contact with the surface on the main body side, each inlet side opening that can be connected to each inlet port, and another valve body side that is in sliding contact with the other surface on the main body side Each outlet side opening formed on a surface and connectable to each outlet port; and a connection passage connecting each inlet side opening and each outlet side opening. Rotating around the rotation axis of the valve body penetrating the valve body side surface,
The other surface of the main body side and the valve body side so that the connection relationship between the outlet port and the outlet side opening is the same at the first switching position and the third switching position or the fourth switching position. A recess is formed with respect to at least one of the other surfaces, and the valve body is rotated so that the connection relationship between each outlet port and each outlet-side opening is not changed. A hydraulic excavator, wherein a connection pattern between the first switching position and the third switching position or the fourth switching position is changed by changing a connection relationship between the inlet port and each of the inlet-side openings. Pilot pressure pattern switching valve.   A pressure chamber is formed between a surface of the valve body opposite to the valve body side and the main body, and pressure oil is introduced into the pressure chamber, whereby the valve body side surface and the main body side The pilot pressure pattern switching valve for a hydraulic excavator according to any one of claims 1, 2, 4, 5, and 6, wherein

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