JPH08705U - Directional switching valve arrangement structure of hydraulic excavator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a directional switching valve arrangement structure for a hydraulic excavator, which requires a small space on the revolving structure and facilitates spool replacement work and piping connection work. [Structure] Front structural members 6, 7, 8 and their actuators 9, 10, 11 and a swing motor 4 for a swing structure 5.
And a traveling body 3 having a traveling motor 2 and a directional control valve arrangement structure of a hydraulic excavator in which directional control valves 21 for controlling driving of actuators 2, 4, 9, 10, 11 are disposed on a revolving superstructure 5. , The directional control valves 21 are respectively arranged in the two valve blocks 24a, 24b with the spools in the vertical direction, and the two valve blocks 24a, 24b of the revolving motor 4 between the frames 5a, 5b of the revolving unit 5 are disposed. The two valve blocks 24a, 2 are arranged in the rear space position.
Actuator supply ports are provided on the outer surface of 4b, and the above-mentioned actuators 2, 4, 9, 10, and 11 are connected to these actuator supply ports.

Description

[Detailed description of the device]       [0001]     [Industrial applications]   The present invention relates to a front structural member including a boom, an arm, and a bucket and a revolving structure. The present invention relates to a hydraulic excavator equipped with a vehicle and a traveling body, particularly a front component, a revolving body, and The present invention relates to an arrangement structure of a directional control valve that controls each actuator that drives a row body.       [0002]     [Prior art]   5 and 6 are explanatory views showing a directional switching valve arrangement structure of a conventional hydraulic excavator. 5 is a plan view and FIG. 6 is a side view. In these figures, 1 is a hydraulic excavator book In the body, a traveling body 3 traveling by a traveling motor 2 is provided in the lower portion, and a swing motor is provided in the upper portion. It has a revolving structure 5 which revolves by 4. 6 is rotatably connected to the revolving structure 5. Boom, 7 is an arm rotatably connected to the boom 6, and 8 is an arm 7 A bucket rotatably connected to the boom 6, the arm 7 and the bucket. The grate 8 constitutes a front constituent member. 9 is a boom cylinder that drives the boom 6. Da, 10 is an arm cylinder for driving the arm 7, 11 is a bar for driving the bucket 8. The ket cylinders 12a and 12b have rigidity connected to the arm cylinder 10. A tubular body, and 13a and 13b are rigid tubular bodies connected to the bucket cylinder 11. Is. In FIGS. 5 and 6, the arm cylinder 1 is shown for the sake of simplicity. Only the pipes connected to 0 and the bucket cylinder 11 are shown. . Boom cylinder 9, arm cylinder 10, and bucket cylinder 14 and 15 Two valve blocks each incorporating a directional control valve for controlling the drive of the damper 11. The directional control valve spool so that it can slide in the horizontal plane of the two valve blocks. Is installed on the upper surface of the actuator and supplies the pressure oil to the above actuators. It has a supply port and is arranged at the rear of the cab 16 provided on the revolving structure 5. 1 7a, 17b, 18a, 18b are respectively in two valve blocks 14, 15 respectively. Rigidity connected to the actuator supply port connected to the spool of the directional valve Is a pipe body having an extension along the back of the cab 16, It is bent along the side part so that its end is located near the turning motor 4. It is provided. 19a and 19b are pipes 17a and 17b and pipes 12a and 12a, respectively. A flexible tube or hose for connecting to 12b, which is 20a, 20b Flexible tubes connecting the tubular bodies 18a and 18b and the tubular bodies 13a and 13b, respectively. The body or hose. Hoses 19a, 19 connected to the arm cylinder 10 b and the hoses 20a and 20b connected to the bucket cylinder 11 are respectively Two frames that are the main frame forming the revolving structure 5 and the outer peripheral surface of the revolving motor 4. The holes 5a and 5b are arranged through the respective gaps.       [0003]   In addition, in the piping structure, the above-mentioned pipe bodies 12a, 12b, 13a, 13b, ho The bases 19a, 19b, 20a, 20b and the tubular bodies 17a, 17b, 18a, 18b As illustrated, at least two on the inlet side and the outlet side with respect to one actuator. It has two pipe paths, and therefore has a boom cylinder 9 and an arm cylinder 10. 1 corresponding to the bucket cylinder 11, the swing motor 4, and the two traveling motors 2. It has two pipe paths. In addition, considering the merging of two circuits, there are more pipe routes or Will increase the number of pipes.       [0004]   For the arrangement structure of the directional control valve configured in this way, a hydraulic pump (not shown) The pressure oil discharged from the pump flows through the directional control valves in the two valve blocks 14 and 15. The direction and the like are controlled, and the pressure oil is, for example, the pipe body 17a, the hose 19a, the pipe body 12a. Is supplied to the arm cylinder 10 via the pipe, and the return oil is supplied to the tube body 12b and the hose 19 b, it is guided via the tube body 17b, whereby the arm 7 rotates, and Pressure oil is transferred to the bucket cylinder 11 via the pipe 18a, the hose 20a, and the pipe 13a. The supplied oil is guided through the pipe body 13b, the hose 20b, and the pipe body 18b. , Thereby rotating the bucket 8 to the boom cylinder 9 via a pipe body (not shown). A desired excavation work or the like is performed along with the rotation of the boom 6 caused by the introduction of the pressure oil. You can       [0005]     [Problems to be solved by the device]   In the above-mentioned prior art, two valve blocks 14, each incorporating a directional valve, 15 is located in the back of the cab 16 and these valve blocks 14, 15 are as described above. Since the pipes 17a, 17b, 18a, 18b connected to the It occupies a space including the back part of the chamber 16 and the vicinity of the turning motor 4, so that a large arrangement is possible. Needing space. Furthermore, the two valve blocks 14, 15 are It has an actuator supply port on the top surface and the spool of each directional control valve Since it is designed to slide, when replacing the spool, the valve Installing and removing the spool in an extremely narrow space near the sides of blocks 14 and 15 This must be done, and the spool replacement work is complicated.       [0006]   The present invention has been made in view of the above problems, and an object thereof is to arrange on a revolving structure. The space is small, and the work of replacing the spool of the directional control valve and connecting the pipes are done. To provide a directional control valve arrangement structure for a hydraulic excavator that can easily perform work. It is in.       [0007]     [Means for Solving the Problems]   The above-mentioned purpose is a boom, an arm, and a front component member including a bucket, Boom cylinder, arm cylinder, and bucket cylinder that drive them respectively. The vehicle at the middle position on the front of the revolving structure where the driver's cab is located. A swivel motor is placed on the rear swivel, and the swivel motor moves the swivel underneath. The swing body is installed so as to be rotatable with respect to the travel body having a traveling motor located in one direction. Boom cylinder, arm cylinder, bucket cylinder, swing motor, and traveling Directional switching valve arrangement for hydraulic excavators with various directional switching valves for controlling motor drive In the structure, each of the directional control valves is spooled in two valve blocks connected to each other. Are arranged in the vertical direction, and the two valve blocks are arranged in the revolving structure. At the rear position of the swing motor, the directional control valves are arranged side by side along the front-back direction of the swing structure. The two valve blocks facing each other opposite to the inner surface where the two valve blocks connect. Two actuator supply ports for each spool on the outer surface Are installed at upper and lower positions, and each directional valve is connected to two actuators. Boom cylinder, arm cylinder, bucket cylinder, rotary This is achieved by connecting to the rotation motor and the traveling motor.       [0008]     [Action]   Connects two valve blocks with each directional control valve with spool in vertical direction By arranging it in the space behind the swing motor, Of space can be used effectively and the area of the space in the horizontal direction can be created. Arrange each directional control valve so that it is as small as possible, and The space between the two valve blocks is placed on the revolving structure. Is smaller, the spool replacement work for each directional control valve and the pipes for the two valve blocks You can get enough work space to connect your body and perform each work easily. I can. In addition, the space behind the driver's cab can be used to install other equipment. Can be used.       [0009]     【Example】   An embodiment of the directional control valve arrangement structure of a hydraulic excavator according to the present invention will be described below with reference to the drawings. Reveal   1 and 2 are explanatory views showing an embodiment of the present invention. FIG. 1 is a plan view and FIG. 2 is a side view. FIG. 3, FIG. 3 is an enlarged detailed view of an essential part corresponding to FIG. 1, and FIG. 4 is an enlarged detail of an essential part corresponding to FIG. It is a figure.       [0010]   In these figures, 1 is a main body, 3 and 5 are running bodies that make up the main body 1, and a swing. A body 4, a swing motor, and 5a and 5b are main frames forming the swing body 5. Rames, 6, 7, and 8 are booms, arms, and buckets, and 9, 10, and 11 are booms. Arm cylinder, bucket cylinder, arm cylinders 12a, 12b Rigid pipes connected to the binder 10, 13a and 13b are bucket cylinders 11 is a rigid pipe connected to 11, 16 is a driver's cab, and these are described above. It is equivalent to that shown in FIGS.       [0011]   24a and 24b are the boom cylinder 9, the arm cylinder 10 and the bucket. To control the drive of the drive cylinder 11, the two traveling motors 2, and the turning motor 4. Two valve blocks incorporating a switching valve 21, which are connected and At the rear space position of the turning motor 4 located at the rear part of the foot of the boom 6. It is arranged between two frames 5a and 5b. Each directional valve 21 is a revolving structure. 5 are arranged side by side along the front-back direction, and the spool can slide vertically. Are located within the valve blocks 24a, 24b. Two valve blocks 24a, Two opposing outer surfaces (both side surfaces) opposite to the inner surface to which 24b is coupled are respectively provided. The two actuator supply ports should be separated from each other in the upper and lower positions with respect to one spool. Have. 22a and 22b are tube bodies 12a connected to the arm cylinder 10. , 12b and the two actuation valves of the directional control valve 21 for the arm cylinder of the valve block 24a. Flexible pipes (hoses) 23a, 2 for connecting to the cheetah supply port Reference numeral 3b denotes pipes 13a and 13b connected to the bucket cylinder 11 and a valve block 24. two actuator supply ports of the directional control valve 21 for the bucket cylinder b. It is a flexible tube body (hose) for connecting to. Another actuator 2 Similarly for the two traveling motors 2 and the turning motor 4, the two valve blocks 24 a, 24b to the actuator supply port of each directional control valve via a pipe Connected. Further, the tubular bodies 22a and 22b, the tubular bodies 23a and 23b, and the other tubular bodies are , Through the respective gaps between the outer peripheral surface of the turning motor 4 and the two frames 5a and 5b, The mutual connection is achieved as described above.       [0012]   In the arrangement structure of the directional control valve thus configured, each directional control valve 21 The two coupled valve blocks 24, 24b incorporating the At the rear space position of the turning motor 4 located in the rear part of the frame, the two frames 5a, 5 so that the directional control valves 21 are arranged along the front-rear direction of the revolving structure 5. The valve blocks 24a, 2 are arranged so that the spool can slide vertically. 4b, so that the space behind the swing motor 4 on the swing body 5 is restricted. However, the horizontal arrangement space is small, and the two valve blocks 24a , 24b, a sufficient working space can be obtained in the upper surface direction of each directional control valve 2 By removing the cap that is attached to the upper surface of 1, spool replacement work can be performed easily. I can. In addition, the two inner surfaces of the valve blocks 24a and 24b are not connected to each other. Two for each spool, one on each of the two opposing outer surfaces (both sides) By providing the actuator supply port at the upper and lower positions, the valve block 24 Use the space on both sides of a and 24b to connect each actuator supply port to each tube. Continuation work can be easily performed.       [0013]   In addition, the space behind the driver's cab 16 is used as the installation space for other equipment, the work tool box installation space, It can be used as a space for installing a hydraulic oil tank.       [0014]     [Effect of device]   According to the directional control valve arrangement structure of the hydraulic excavator of the present invention described above, each actuation valve is The space for arranging the two valve blocks that incorporate the directional valves corresponding to the user is small. Sufficient work space, yet sufficient working space above and both sides of the two valve blocks Since it can be obtained, spool replacement work for each directional control valve and piping connection work There is an effect that can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view illustrating an embodiment of a directional control valve arrangement structure for a hydraulic excavator according to the present invention. FIG. 2 is a side view illustrating an embodiment of the directional control valve arrangement structure of the hydraulic excavator of the present invention. FIG. 3 is an enlarged detail view of an essential part corresponding to FIG. FIG. 4 is an enlarged detail view of an essential part corresponding to FIG. FIG. 5 is a plan view illustrating a conventional directional control valve arrangement structure for a hydraulic excavator. FIG. 6 is a side view illustrating a conventional directional control valve arrangement structure for a hydraulic excavator. [Explanation of reference numerals] 2 traveling motor 3 traveling body 4 revolving motor 5 revolving body 5a frame 5b frame 6 boom 7 arm 8 bucket 9 boom cylinder 10 arm cylinder 11 bucket cylinder 12a pipe body 12b pipe body 13a pipe body 13b pipe body 16 operation Chamber 21 Directional switching valve 22a Tube 22b Tube 23a Tube 23b Tube 24a Valve block 24b Valve block

Claims (1)

[Claims for utility model registration] (1) A front structure member including a boom, an arm, and a bucket, and a boom cylinder, an arm cylinder, and a bucket cylinder that drive the boom, arm, and bucket, respectively, are provided in a front part of a revolving structure in which a driver's cab is located. Connected at the middle position, a swing motor is arranged on the swing body behind the connected position, and this swing motor allows the swing body to be installed so as to be swingable with respect to the traveling body having the traveling motor located below the swing body. In the directional control valve arrangement structure of the hydraulic excavator, in which the directional control valves for controlling the drive of the boom cylinder, the arm cylinder, the bucket cylinder, the revolving motor, and the traveling motor are disposed on the revolving structure, the respective directional control valves are combined. The spools are respectively arranged in the vertical direction in each of the two valve blocks provided, and the two valve blocks are arranged in the revolving structure. At the rear position of the swing motor, the directional control valves are arranged side by side along the front-rear direction of the swing body, and the two inner side surfaces of the two valve blocks, which are opposite to each other, are provided on two opposite outer side surfaces, respectively. 2 for one spool
One actuator supply port is provided at a vertically separated position, and each direction switching valve is connected to the boom cylinder, arm cylinder, bucket cylinder, swing motor, and traveling motor via two actuator supply ports, respectively. The structure for directional switching valve of hydraulic excavator. (2) Connection between the two actuator supply ports of each directional control valve and the boom cylinder, arm cylinder, and bucket cylinder is formed between the outer peripheral surface of the swing motor and the two frames of the swing body. The directional control valve arrangement structure for a hydraulic excavator according to claim (1), characterized in that the operation is performed by a pipe path passing through each gap.