JP2003336769A - Support structure of valve element connection piping in construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support structure of valve element connection piping in a construction machine wherein stress to be generated in the connection part of pilot piping with a valve block and a shuttle block is reduced. <P>SOLUTION: The support structure of valve element connection piping in a construction machine supports pilot piping 71a, 71b connected to the valve block and the shuttle block. It is equipped with an elastic member 81 which is abutted to the pilot piping 71a, 71b and supports the pilot piping 71a, 71b. The elastic member 81 is mounted to the screw hole provided on the top surface of the valve block 41 through a bracket 82. The elastic member 81 consists of rubber material or synthetic resin material, and the pilot piping 71 consists of a bent tube. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic excavator for supporting a pilot pipe connected to a valve block including a plurality of directional control valves and a shuttle block including a plurality of shuttle valves. The present invention relates to a support structure for valve body connection piping in a machine.

[0002]

2. Description of the Related Art A conventional excavator of this type will be described with a hydraulic excavator as an example.

This hydraulic excavator is equipped with an endless track type traveling body, a revolving structure is provided on the upper part of the traveling structure, and a driver's seat is provided on the revolving structure. A front member rotatable in the direction is attached. The traveling body has a traveling motor around which the crawler belt is wound and which drives the crawler belt. Further, the front member includes a boom, an arm, and a bucket that are vertically rotatable so as to be excavable, and these boom, arm, and bucket are driven by the boom cylinder, the arm cylinder, and the bucket cylinder.

This hydraulic excavator includes a variable displacement hydraulic pump, a controlled object for controlling the discharge amount of the hydraulic pump, that is, a regulator, the above-mentioned traveling motor driven by pressure oil discharged from the hydraulic pump, a boom cylinder, and the like. And the directional control valves such as the right directional control valve, the left directional control valve, and the boom directional control valve that control the flow of pressure oil supplied from the hydraulic pump to each of the above actuators. There is. The plurality of directional control valves are integrally incorporated in a valve block, and the valve block is mounted on the revolving structure via a bracket.

A pilot pump which is driven in synchronization with the variable displacement hydraulic pump described above, and a traveling operating device which is connected to the pilot pump and generates control pilot pressure for remotely operating each of the directional control valves described above. , An operating device such as a boom / bucket operating device, and a plurality of shuttle valves for separately taking out the control pilot pressure generated by the operation of these operating devices as a control pressure signal such as a pump control signal for driving the regulator. I have it. The plurality of shuttle valves are provided in a shuttle block that integrally incorporates them, and the shuttle block is mounted on the valve block via a bracket.

The valve block and the shuttle block are connected to their respective connection ports by rigid pipes, that is, pilot pipes. The plurality of pilot pipes are sandwiched and supported by a fixture composed of two members so as to be located near the valve block.

With this structure, when the hydraulic pump is driven, pressure oil is discharged from the hydraulic pump, and the pressure oil is passed through the valve block to the boom cylinder, arm cylinder, bucket cylinder, traveling motor, etc. which are actuators. It is supplied and each drives. By driving each of these actuators, for example, the front member operates to perform excavation work, or the traveling body travels to move the hydraulic excavator forward or backward.

[0008]

In the hydraulic excavator constructed as described above, the valve element such as the valve block and the shuttle block is integrally attached to the revolving body via the bracket so that the engine and other devices are not attached. Support differently,
Connected to the valve blocks so that the shuttle block is supplied with pressure oil from the pilot pump, and the valve block is supplied with variable displacement hydraulic pump, even though vibration from the engine is not affected. Since the hydraulic pumps to be operated are different from each other, the pressure pulsation generated on the discharge side due to the rotation of each hydraulic pump is transmitted to the shuttle block and the valve block, and the pilot pipe is vibrated. As described above, since the long pilot pipe for remote control is connected to the shuttle block and the valve block, the different vibrations transmitted cause the pilot pipe to resonate. As a result, a large stress is generated at the end of the pilot pipe, that is, at the connecting portion of the pilot pipe between the valve block and the shuttle block. Therefore, there is a problem that the life of the pilot pipe is shortened due to the above-mentioned stress during the repeated work.

The present invention has been made in view of the above-mentioned conventional state of the art, and an object thereof is to make a valve element in a construction machine capable of reducing a stress generated in a connecting portion of a pilot pipe with a valve block and a shuttle block. It is to provide a support structure for connection piping.

[0010]

In order to achieve the above object, the invention according to claim 1 of the present application is a hydraulic pump and a plurality of directional control for controlling a plurality of actuators by the pressure discharged from the hydraulic pump. A valve block including a valve, an operating device for remotely operating the plurality of directional control valves, a pilot pump connected to the operating device for generating a control pilot pressure, and a plurality of detecting the control pilot pressure. A shuttle block including a shuttle valve, a bracket for supporting the shuttle block on the valve block, and a pilot pipe connected to the shuttle block and the valve block are provided. From the shuttle block to the controlled object. It is configured to guide the control pilot pressure generated by the operating device. In the support structure of the valve body the connecting pipe in the set machine, attached directly or indirectly to the elastic member in the valve block, the elastic member are a configuration that abuts to the pilot pipes.

In the invention according to claim 1 having such a structure, the vibration of the pilot pipe generated due to the pressure pulsation of the hydraulic pump, for example, is absorbed by the elastic member, and accordingly, at the end of the pilot pipe. Generation of stress can be relieved, and deterioration of durability of the pilot pipe can be suppressed.

According to a second aspect of the present invention, in the invention according to the first aspect, the valve block is provided with a screw hole for lifting, and the elastic member is inserted through a bracket using the screw hole. It is configured to be attached.

According to the second aspect of the present invention having the above-described structure, since the screw hole provided in the valve block in advance can be used, the process of forming a new screw hole is not required, and the elastic member can be easily provided. Bracket can be attached.

The invention according to claim 3 of the present application is the structure according to claim 1 or 2, wherein the elastic member is made of a rubber material or a synthetic resin material.

The invention according to claim 4 of the present application is the structure according to any one of claims 1 to 3, wherein the pilot pipe is composed of a bend tube.

Further, the invention according to claim 5 of the present application is the invention according to claims 1 to 4, wherein the elastic member is directly or indirectly attached to the valve block, and the elastic member is provided with a plurality of the pilot pipes. Is configured to abut.

In the invention according to claim 5 configured as described above, since the elastic member follows the vibration of the plurality of pilot pipes during vibration such as excavation work, stress generated at the end portions of the plurality of pilot pipes. The concentration of can be relieved at the same time.

According to a sixth aspect of the present invention, in the invention according to the first to fifth aspects, the construction machine comprises a hydraulic excavator.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a support structure for a valve body connecting pipe in a construction machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a hydraulic excavator cited as an example of a construction machine provided with an embodiment of a support structure for a valve body connecting pipe of the present invention, and FIG. 2 is a hydraulic excavator shown in FIG. FIG. 3 is a circuit diagram showing a hydraulic circuit provided in the. FIG. 3 is a perspective view showing an embodiment of the present invention.
Further, FIG. 4 is an enlarged perspective view showing a main part configuration of the embodiment shown in FIG. 3, and FIG. 5 is a front view of the main part configuration shown in FIG.

This embodiment is provided in a hydraulic excavator, for example, and as shown in FIG.
A revolving structure 2 is provided above the traveling structure 1 having a and a left traveling motor (not shown), and the revolving structure 2 has a driver's seat 3. A front member 4 that is vertically rotatable is attached to the revolving unit 2. The front member 4 includes a boom 4a, an arm 4b, and a bucket 4c, and also has a boom cylinder 4d, an arm cylinder 4e, and a bucket cylinder 4f that move the boom 4a, the arm cylinder 4e, and the bucket cylinder 4f, respectively.

As shown in FIG. 1, the revolving unit 2 has a revolving unit provided with a valve block 41 in the center thereof. It is placed on the body 2 via a bracket 90. On the side of the valve block 41, there is attached a valve element for sending a control pressure signal to the valve block 41 via a bracket 70, that is, a shuttle block 47 containing a plurality of shuttle valves. As shown in FIG. 3, the valve block 41 and the shuttle block 47 are connected to their respective connection ports by bend tubes, that is, pilot pipes 71a and 71b having a plurality of rigidity.

This hydraulic excavator is equipped with the hydraulic circuit shown in FIG. A first variable displacement hydraulic pump 21, a second variable displacement hydraulic pump 22, a pilot pump 23 that is operated by an engine 20 that is a drive source, a regulator 24 that controls the discharge amount of the first variable displacement hydraulic pump 21, and a second variable displacement. It has a regulator 25 that controls the discharge amount of the hydraulic pump 22.

Further, for the right traveling, which is provided on the first center bypass passage 27 communicating with the first main pipe passage 26 for guiding the pressure oil of the first variable displacement hydraulic pump 21, the drive of the above-mentioned right traveling motor 1a is controlled. The directional control valve 28, the bucket directional control valve 29 that controls the drive of the bucket cylinder 4f, the boom first directional control valve 30 that controls the drive of the boom cylinder 4d, and the arm cylinder 4e. The second arm directional control valve 31 for controlling the drive is provided.

Similarly, a turning direction control for controlling the driving of a turning motor (not shown) provided on the second center bypass passage 33 communicating with the second main conduit 32 for guiding the pressure oil of the second variable displacement hydraulic pump 22. The valve 34 and the arm first directional control valve 35 for controlling the drive of the arm cylinder 4e described above.
A second boom direction control valve 36 for controlling the drive of the boom cylinder 4d described above, a spare direction control valve 37,
A left traveling directional control valve 38 for controlling the drive of a left traveling motor (not shown) is provided.

Further, a connecting pipe 39 for connecting the input port of the right traveling directional control valve 28 and the input port of the left traveling directional control valve 38, and a communication valve 40 for connecting and disconnecting the connecting pipe 39. It has and.

The above-mentioned directional control valves 28-31, 34-
38, the center bypass passages 27 and 33, the communication passage 39, and the communication valve 40 constitute a single structure.
It is integrally built in 1.

The hydraulic circuit also includes a pilot relief valve 43 for defining the magnitude of the pilot primary pressure discharged from the pilot pump 23, and the pilot pump 23.
Of the directional control valve 28-
An operating device for generating a control pilot pressure for remotely operating the corresponding one of 31, 34 to 38, for example, the right traveling directional control valve 28 and the left traveling directional control valve 3 described above.
A traveling operating device 44 for switching 8 and a boom / bucket operating device 45 for remotely operating the boom first directional control valve 30, the boom second directional control valve 36, and the bucket directional control device 29 described above. , The directional control valve 34 for turning, the second directional control valve 31 for arm, the first directional control valve for arm
A turning / arm operating device 46 for switching the directional control valve 35 is provided.

Further, these operating devices 44 to 46,
A shuttle block 47 is arranged in the flow path between the valve block 41 and the valve block 41 as shown in FIG. In this shuttle block 47, for example, a shockless valve group 48 is incorporated on the upstream side, and a shuttle valve group 49 on the downstream side.
Is built in.

Each of the shockless valves included in the shockless valve group 48 described above has an operating device 44-.
Even when 46 is suddenly operated, the flow of the control pilot pressure is appropriately controlled to control the direction control valves 28 to 31, 34 to 38.
The rapid switching operation of the hydraulic actuator is regulated so that the impact generated in the corresponding hydraulic actuator is mitigated. Such a shockless valve itself has been well known in the past.

The above-mentioned shuttle valve group 49 includes
It includes a shuttle valve that takes out the control pilot pressure generated by the operation of the operating devices 44 to 46 as a predetermined control pressure signal.

These shuttle valves are shown in FIG.
Of the pump control signal for controlling the drive of the first regulator 24 shown in FIG. 7 as a control pressure signal, the pump control signal of controlling the drive of the second regulator 25 described above as a control signal pressure signal, and While keeping the brake valve 11 in the braking release state, a traveling operation signal for switching the communication valve 40 is taken out as a control pressure signal, and a front operation signal utilized for drive control of the front including a boom, an arm and a bucket is controlled. It includes what is taken out as a pressure signal for use.

Note that, for example, the above-described running operation signal and front operation signal are input to the controller 68 shown in FIG. 2 in order to carry out a predetermined calculation and the like.

Reference numerals 65a and 65b shown in FIG. 2 are signal lines for guiding the above-mentioned pump control signals output from the shuttle block 47 to the regulators 24 and 25, 66 is a signal line for guiding a traveling operation signal, and 67 is a front operation signal. Is a signal line that guides. Further, 11 is a turning motor 10
It is a swing brake valve for braking.

As shown in FIG. 3, a bracket 70 is integrally provided on the upper side of the above-mentioned valve block 41 via a plurality of bolts, and the bracket 70 is mounted on the bracket 70 via the plurality of bolts. A shuttle block 47 is attached.

Each of the connection ports of the shuttle block 47 and each of the connection ports of the valve block 41 are
They are connected by rigid pilot pipes 71a and 71b. Further, to the other connection port of the shuttle block 47, rigid pilot pipes 72 to 79 are connected as conduits for guiding the above-mentioned control pressure signal.

Particularly, in this embodiment, the above-mentioned bracket 81 has an L-shaped basic cross section as shown in FIG.
A fixed portion 81b having a first cutout portion 81c and a vertical plate 81a to which the elastic member 81 is attached are provided. The elastic member 80 is made of rubber, for example, and is formed in a quadrangle. Further, the second cutout portion 8 is provided on the lower portion of the vertical plate 81a.
1d is formed. That is, as shown in FIG. 4, a slight gap 82 is secured between the vertical plate 81 a and the ground contact surface of the bracket 81.

Further, one end of the bracket 81, that is,
As shown in FIG. 3, the fixed portion 81b includes the first cutout portion 81.
Through c, it is fixed to a screw hole (not shown) for lifting formed in the valve block 41 by a bolt 83. An elastic member 80 located on the other end side of the bracket 81 contacts, for example, two long pilot pipes 71a and 71b arranged on the side of the valve block 41.

According to one embodiment configured in this way,
The engine 20 shown in FIG. 2 is driven to drive the hydraulic pump 21,
For example, when the turning / arm operating device 46 is operated while the arm 22 is being operated to raise the arm, the control pilot pressure generated by the operating device 46 passes through the shockless valve 48 of the shuttle block 47. For example, the arm first directional control valve 35 and the arm second directional control valve 31 of the valve block 41 shown in FIG. As a result, the first arm
The directional control valve 35 and the second arm directional control valve 31 are switched, and the pressure oil of the hydraulic pump 22 is transferred to the second main pipe line 32 and the second
Center bypass passage 33, arm first directional control valve 35
Through the first main pipe line 26, the first center bypass passage 27, and the arm second directional control valve 31 to the arm cylinder 4e. As a result, the arm cylinder 4e expands and contracts, and a desired arm raising operation can be performed.

The operation of the turning / arm operating device 46 to lower the arm or the turning operation is performed in substantially the same manner as described above. The same applies when operating the traveling operation device 44 and the boom / bucket operation device 45.

During excavation, the pressure oil discharged from the hydraulic pumps 21 and 22 is transmitted to the valve block 41, and the pressure oil discharged from the pilot pump is transmitted to the shuttle block 47. Different pressure pulsations generated in each pump are transmitted to each of the valve block 41 and the shuttle block 47, and the pilot pipes 71a and 71b connecting the valve block 41 and the shuttle block 7 also vibrate. Here, the elastic member 80 attached to the valve block 41 via the bracket 81 contacts the pilot pipes 71a and 71b, and the pilot pipes 71a and 71b
71b supports the pilot pipe 71.
The vibration generated in each of a and 71b is absorbed by the elastic member 80. The vertical plate 81a of the bracket 81
Since a gap 82 is provided below the vertical plate 81a,
The device itself also functions as a vibration absorbing member, and can follow the vibrations of the pilot pipes 71a and 71b.

According to the embodiment configured as described above,
For example, the pilot pump 23 and the variable displacement hydraulic pump 2
The vibrations of the pilot pipes 71a, 71b generated by different pressure pulsations between the elastic members 8 and
0 and the vertical plate 81a of the bracket 81, and accordingly, the connection ends of the pilot pipes 71a and 71b to the valve block 41, or the shuttle block 4.
The stress concentration at the connection end portion to 7 can be relieved. As a result, it is possible to suppress the occurrence of damage to the pilot pipes 71a and 71b.
The durability of 1a and 71b can be improved. Therefore, it is possible to suppress the replacement frequency of the pilot pipes 71a, 71b due to the damage of the pilot pipes 71a, 71b.

The bracket 8 provided with the elastic member 80
When attaching 1 to the valve block 41, it is possible to use a screw hole provided in advance in the valve block 41, so that there is no need to perform processing for forming a new screw hole, and the elastic member 80
The bracket 81 provided with can be attached.

Further, since the elastic member 80 can absorb the vibrations of the plurality of pilot pipes 71a, 71b, it is possible to relieve the stress concentration generated at the end portions of the plurality of pilot pipes 71a, 71b.

Although the elastic member 80 is made of a quadrangular rubber material in the above-described embodiment, the present invention is not limited to this, and the elastic member 80 may have a round shape, an elliptical shape, or another shape. It may be formed in a rectangular shape, and if the material is made of a synthetic resin material, the same operational effect is obtained.

In the above-described embodiment, the elastic member 80 is indirectly connected to the valve block 41 via the bracket 81.
Although the present invention is not limited to this, the same effect can be obtained even if the elastic member 80 is directly attached to the valve block 41.

Further, in the above-described embodiment, the vibration which is liable to occur and the stress which is generated only in the long-shaped pilot pipes 71a and 71b is absorbed is described. The present invention is not limited to this, and the same operation and effect can be obtained by supporting the other pilot pipes 72 to 79 in addition to the pilot pipes 71a and 71b.

Furthermore, in the above-described embodiment, the elastic member 80 is configured to be attached to the valve block 41 via the bracket 81.
Even if it is configured to be indirectly attached to the valve block 41 by being attached to the above-described bracket 90 that supports 1, the same operational effect can be obtained.

[0049]

As described above, according to the present invention,
By attaching an elastic member directly or indirectly to the valve block and abutting this elastic member on the pilot pipe, the elastic member absorbs the vibration of the pilot pipe caused by the pressure pulsation of the hydraulic pump. You can As a result, it is possible to suppress the generation of stress at the end portion of the pilot pipe and improve the durability of the pilot pipe connected to the valve body. Furthermore, since the frequency of replacement of the pilot pipe can be reduced, the maintenance cost can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a side view showing a hydraulic excavator taken as an example of a construction machine provided with an embodiment of a support structure for a valve body connecting pipe of the present invention.

FIG. 2 is a circuit diagram showing a hydraulic circuit provided in the hydraulic excavator shown in FIG.

FIG. 3 is a perspective view showing an embodiment of the present invention.

FIG. 4 is an enlarged perspective view showing a configuration of a main part of the embodiment shown in FIG.

5 is a front view of the main configuration shown in FIG. 4. FIG.

[Explanation of symbols]

41 valve block (valve body) 47 Shuttle block (valve body) 70 bracket 71a Pilot piping 71b Pilot piping 72-79 Pilot piping 80 Elastic member 81 bracket 81a Vertical plate 81b Fixed part 81c 1st notch part 81d 2nd notch 82 gap 83 bolts 90 bracket

Claims (6)

[Claims] 1. A hydraulic pump, a valve block including a plurality of directional control valves for controlling a plurality of actuators by the pressure discharged from the hydraulic pump, and an operating device for remotely operating the plurality of directional control valves. A pilot pump connected to the operating device for generating a control pilot pressure, a shuttle block including a plurality of shuttle valves for detecting the control pilot pressure, and a bracket for supporting the shuttle block on the valve block, A valve in a construction machine comprising a pilot pipe connected to the shuttle block and the valve block, and configured to guide the control pilot pressure generated by the operating device from the shuttle block to the controlled object through the pilot pipe. In the support structure of body connection pipe, in the valve block Indirect or indirectly attached to the elastic member, the support structure of the valve body the connecting pipe in the construction machine, characterized in that the resilient member abuts to the pilot pipes. 2. The valve body in a construction machine according to claim 1, wherein the valve block has a screw hole for lifting, and the elastic member is attached via a bracket using the screw hole. Support structure for connecting piping. 3. The support structure for a valve body connecting pipe in a construction machine according to claim 1, wherein the elastic member is made of a rubber material or a synthetic resin material. 4. The support structure for a valve body connecting pipe in a construction machine according to claim 1, wherein the pilot pipe is a bend tube. 5. The elastic member is directly or indirectly attached to the valve block, and the elastic member is brought into contact with a plurality of the pilot pipes.
4. A support structure for valve body connection piping in the construction machine according to any one of 4 above. 6. The support structure for a valve body connecting pipe in a construction machine according to claim 1, wherein the construction machine is a hydraulic excavator.