JP2003219706A - Control valve device of traveling working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control valve device of a traveling working machine, which can smoothly perform the switching operation of a control valve and can be compacted. <P>SOLUTION: This control valve device comprising a control valve 20 for switchably supplying a hydraulic oil to a hydraulic cylinder 11 for liftably supporting a working machine 12 or the like mounted on a traveling machine frame 1c, an operation rod 50 connected to stretchably operate the main spool 21 of the control valve 20, and a spring 56 connected to the operation rod 50 to energize the main spool 21 in the returning direction is characterized by engaging one end of the spring 56 whose other end is connected to the operation rod 50, with a support shaft 38 attached to a valve case 3, and guiding and supporting the operation rod 50 with the shaft-supporting platform 37 of the valve case 3 to which the support shaft 38 is attached, thus extending or contracting the main spool 21. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve device for a traveling working machine such as an agricultural tractor.

[0002]

2. Description of the Related Art Conventionally, a tractor for raising and lowering a tilling implement mounted on a rear portion of a traveling machine body by rotating a lift arm connected to a hydraulic cylinder is disclosed in Japanese Patent Laid-Open No. 10-28407.
The control valve device as shown in Japanese Patent Publication No. JP-A-2003-13898 is used, and the hydraulic cylinder is actuated by expanding and contracting the spool for controlling the switching of the control valve through the actuating rod that is moved back and forth by operating the lifting operation lever and the like. The ones that have been done are already known.

[0003]

In the control valve device constructed as described in the above publication, the operating rod connected to the spool of the control valve is provided with a spring for urging the spool in the return direction, and the operating rod is provided. By slidingly inserting the extended rear end into the guide hole of the support member provided at the rear of the support rod, it is possible to support it while preventing the operating rod from swinging when moving back and forth.
Since the supporting structure for the operating rod and the spring is long and the other end of the spring connected to the operating rod is attached to a mounting member different from the supporting member, the structure is complicated and the cost is high, and the control valve device is also provided. However, there is a problem such as an increase in size.

[0004]

In order to solve the above problems, a control valve device for a traveling working machine according to the present invention is, firstly, a hydraulic cylinder for supporting a working machine 12 mounted on a traveling machine body 1c so as to be able to move up and down. 11 and valve case 3
Installed on the control valve 20 for switching the hydraulic oil to the hydraulic cylinder 11, the operating rod 50 connected to the spool 21 of the control valve 20 so as to extend and retract, and the main rod connected to the operating rod 50. In the one including the spring 56 for urging the spool 21 in the returning direction, the other end of the spring 56 that connects one end to the operating rod 50 has a support shaft 38 attached to the valve case 3.
It is characterized in that the main spool 21 is extended and contracted by slidably contacting the operating rod 50 with the shaft support seat 37 of the valve case 3 to which the support shaft 38 is attached.

Secondly, the operating rod 50 is guided and supported by the shaft support seat 37 via a liner 39 fitted and inserted in the support shaft 38 with a swing gap.

Thirdly, the main spool 21 of the control valve 20 is characterized in that the operating bracket portion 53 of the operating rod 50 is connected with a margin.

[0007]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a tractor shown as an example of a traveling work machine equipped with a control valve device 2 according to the present invention. The tractor 1 includes front wheels 1a,
At the rear of the traveling machine body 1c having the rear wheels 1b, a working machine 12 such as a tiller working machine is provided via a three-point type link mechanism (not shown).
Is attached so that it can be raised and lowered freely. In addition, in the upper part of the transmission case 1d installed in the rear part of the traveling body 1c,
With the structure as shown in FIG. 2, a lift arm 10 for raising and lowering the link mechanism is pivotally supported, and the lift arm 10 is connected so as to be vertically rotated by the expansion and contraction operation of the hydraulic cylinder 11, so that A control valve device 2 having a control valve 20 for switching hydraulic oil is arranged.

Further, the raising / lowering operation lever (position control lever) 3L and the working depth setting lever (position automatic control lever) 3R that control the operation of the control valve device 2 are provided at their bases on the side of the transmission case 1d. The valve case 3 is axially supported by the valve case 3 to cover the opening and the tip end side is extended to the side of the cockpit. Further, the hydraulic circuit for operating the hydraulic cylinder 11 has a configuration similar to the conventional one as shown in FIG. 6, and when the lifting operation lever 3L is operated, the working machine is operated as a lever via the lift arm 10 and the link mechanism. It is possible to perform the position control to set the height position corresponding to the operating position, and when the plowing depth setting lever 3R is operated, the working machine becomes the plowing depth corresponding to the operating position of the lever in accordance with the position control. It is possible to perform automatic control of plowing depth.

The working machine 12 mounted on the traveling machine body 1c in this embodiment is a rotary working machine as shown in FIG. 6, and the plowing depth (hereinafter referred to as plowing depth) of the rotary portion 12a is as follows. The rear cover 15 provided to be swingable up and down behind the rotary cover 13 is used as a leveler, and the amount of change in which the rear cover 15 comes in contact with the cultivated soil surface and moves up and down is used as in the conventional case to cultivate the depth of cultivating feedback. Feedback is controllably transmitted to the control valve device 2 via the mechanism (cultivation depth sensing link mechanism) 16 so that the raising / lowering position of the working machine 12 by the hydraulic cylinder 11 is set to the working depth set by the working depth setting lever 3R. Tillage depth automatic control is performed.

The control valve 20 of the hydraulic circuit shown in the figure comprises a spool (referred to as a main spool) 21 of a switching valve 21a, a lower spool 22 of a poppet valve 22a, a check valve 20b, an unload valve 23, etc. The hydraulic fluid pumped from the pump side is fed to the input port 24, and is also connected from the output port 20a of the control valve 20 to the hydraulic cylinder 11 via the descent rate adjusting valve 26. 20 is switched as will be described later, and hydraulic oil is supplied to the hydraulic cylinder 11.

Next, the control valve device 2 will be described with reference to FIGS. The control valve device 2 is mounted on a valve case (case wall) 3, and the valve case 3 also serves as a case lid for covering the upper right wall of the transmission case 1d in the front-rear direction. 3a, a plurality of boss portions, and a shaft support seat 37 described later are integrally formed. And
The control valve 20 is mounted and supported on the valve mounting seat 3a inside the valve case 3 such that the main spool 21 and the lower spool 22 thereof are oriented substantially horizontally toward the rear.

A valve actuating portion 5 for controlling valve actuation, which will be described later with reference to FIGS. 7 to 12, is installed by the support structure of the present invention behind the control valve 20 and outside the valve case 3. Lifting lever 3L
And the working depth setting lever 3R, the lifting shaft 30 and the working depth shaft 31
Are rotatably supported by being separated from each other in the vertical direction. Here, the actuating rod 50 of the valve actuating portion 5 is connected to the main spool 21 by a configuration described later, and is provided on both left and right sides of the middle portion of the thick-acting flat strip plate in a vertical posture. A fulcrum shaft 5P is provided in a projecting manner, and each fulcrum shaft 5P is provided with a balance rod (balance link) 51, 52 which is pivotally supported at an intermediate portion thereof and is rotatable in a balance shape.
2 has operating pins 51a and 51b and operating pins 52a and 52b projecting laterally from the upper and lower ends thereof.

The working depth shaft 31 of the working depth setting lever 3R has an actuating piece 32 fixed in the middle of the shaft, and an actuating piece 33 is pivotally supported at the end of the shaft. The operating pins 51a and 52a of the balance rods 51 and 52 arranged on both sides are brought into contact with each other. In addition, the operating piece 33
The other side formed in a cam shape is brought into contact with the operating pin 34a of the elevating hood back shaft 34 of the elevating feedback mechanism 17 which is operated by the operation of the lift arm 10 similarly to the conventional structure.

Further, the lifting shaft 30 rotated by the lifting operation lever 3L has an operating pin 30b projecting from the tip of the rotating arm 30a, and the operating pin 30b is attached to the balance rod 5.
It is brought into contact with the operation pin 51b at the lower end of 1. The hoisting shaft 30 has a plunge depth feedback shaft 35 that is connected to the plowing depth sensing link mechanism 16 inserted into the tubular shaft thereof, and an actuating piece 35a provided at the shaft end of the plowing depth feedback shaft 35.
Is brought into contact with the operating pin 52b at the other end of the balance rod 52.

Further, as shown in FIGS. 7 and 8, in the control valve 20 of the control valve device 2, the connecting rod 25 is inserted into the main spool 21 and the lower spool 22 which are projected so as to be capable of expanding and contracting, and the connecting rod 25 is inserted. 25 nuts 2
Positioning and connection by N ...
2, like the conventional one, is connected to the connecting rod 25 through a mounting hole larger than the diameter of the lower spool 22 so as to be interchangeable so that when the main spool 21 contracts to the upside, it is left unactuated. ing.

At this time, in this embodiment, a mounting hole 53a having a diameter slightly larger than the diameter of the main spool 21 is formed in the operating bracket portion 53 integrally provided on the base side of the operating rod 50, and the mounting hole 53a is formed. The connecting rod 25 of the main spool 21
The end portion projecting from is fitted so as to be interchangeable and positioned by a nut 2N to prevent it from coming off. Further, the operation bracket portion 53 is positioned so as to form a small gap L of about 1 mm or less between the operation bracket portion 53 and the front nut 2N for fastening and fixing the connecting rod 25 to the main spool 21. The actuating bracket portion 53 is connected to the actuating bracket portion 21 at a clearance margin of a small gap L and a fool hole of the mounting hole 53a.

On the rear side of the actuating rod 50, an actuating hole 55 having the length of the expanding and contracting actuating stroke of the main spool 21 is formed in a long hole shape, and the actuating hole 55 is formed in the shaft support seat 37 of the valve case 3.
The support shaft 38 is provided so as to project from the side. As a result, the operating rod 50 has its front and rear ends at the control valve 20.
It is supported by the main spool 21 and the support shaft 38 in a substantially horizontal manner so as to be movable back and forth. The operation bracket portion 53 extends toward the left side to have substantially the same length as the support shaft 38, and a spring 56 for pulling and biasing the main spool 21 in the returning direction is provided between the operation bracket portion 53 and the operation rod 50 along the side thereof. The main spool 21 and the lower spool 22 are urged so as to be constantly pulled (returned) to the rear side through the operating bracket portion 53 and the connecting rod 25, and the balance rod 51, 52 to the respective operating pins 51a, 51
b, 52a, 52b are always contacted.

That is, as described above, the control valve 2
No. 0 main spool 21 and lower spool 22 are connected by the connecting rod 25, and the balance rod 5 is attached to the rear end of the main spool 21.
1 and 52 are provided with an operating rod 50, a spring 56 for returning the spool is provided on the operating rod 50, and the balance rods 51, 52 are provided with corresponding lifting levers 3L and working depth setting levers 3R. The structure in which the pieces 30a and 32 are brought into contact with each other and the configuration in which the operation of the lift arm 10 and the operation of the rear cover 15 are fed back to perform the positioning of the position of the working machine 12 and the control of the working depth are the same as the conventional ones.

The control valve 20 is also similar to the conventional one, and when the raising / lowering operation lever 3L is operated to the neutral position, the lowering spool 22 as shown in FIG.
With the poppet valve 22a and the check valve 20b, the reverse flow of the hydraulic oil in the hydraulic cylinder 11 is stopped, and the hydraulic oil fed from the pump side is transferred from the switching valve 21a to the tank side (transmission case) via the unload valve 23. 1d), the hydraulic cylinder 11 does not extend and contract and holds the rear arm 10 in a rotation stopped state.

Then, when the raising / lowering operation lever 3L is operated to be pushed up and the main spool 21 is pushed in (compression operation),
The switching valve 21a operates the unload valve 23 from the unload state to the closed state by the pilot pressure,
In this state, the hydraulic oil sent from the pump side opens the check valve 20b and flows into the hydraulic cylinder 11, and the hydraulic cylinder 11 extends to rotate the rear arm 10 upward. At this time, since the lower spool 22 is not operated, the poppet valve 22a is closed.

In addition, the lifting operation lever 3L is operated to be lowered,
When the main spool 21 and the lower spool 22 are pulled out (extension operation), the switching valve 21a eliminates the pilot pressure of the hydraulic oil, switches the unload valve 23 to the unloading state, and the pump side via the unload valve 23. The hydraulic oil sent from the tank is flowed to the tank side, and the poppet valve 22a is opened, and the hydraulic oil in the hydraulic cylinder 11 pushed back by the working machine's own weight is discharged to the tank side via the descent rate adjusting valve 26. The hydraulic cylinder 11 contracts to rotate the rear arm 10 downward.

Next, an example of the operation of the control valve 20 and the operating rod 50 will be described with reference to FIGS. 10 to 12. FIG. 10 shows the control valve 20 in the middle position, and from this state, the elevating lever is operated. When 3L is operated in the raising direction, as shown in FIG.
Rotates in the direction of the arrow, and its operating pin 30b is operating pin 5
Since 1b is pushed, the balance rod 51 moves forward with the fulcrum shaft 5P against the spring 56 and the fulcrum shaft 5P as the fulcrum, with the operating pin 51a side fixedly supported by the operating piece 33 as the fulcrum.
The main spool 21 is contracted to control the control valve 20.
Is switched to the raising side, hydraulic oil is sent to the hydraulic cylinder 11, and the lift arm 10 is raised.

As shown in FIG. 12, when the lift arm 10 is moved upward, the operating pin 34a of the elevation feedback mechanism 17 is retracted and rotated upward, and the operating piece 33 is rotated in the arrow direction. Since the operating pin 51a is free to follow the operating piece 33 while the operating pin 51b is supported in contact with the operating pin 30b, the return force (biasing force) of the spring 56 moves the operating rod 50 rearward to control the control valve. The main spool 21 of 20 is returned to the neutral position, the supply of hydraulic oil to the hydraulic cylinder 11 is stopped, and the lift of the lift arm 10 is stopped.

As described above, the operating rod 5 of the valve operating portion 5
The control valve device 2 for switching the control valve 20 by moving 0 back and forth has the same structure as the conventional one, and therefore, here, the valve operating portion is operated by variously operating the elevating operation lever 3L and the working depth setting lever 3R. Although detailed description of the operation of No. 5 is omitted, in the present embodiment, in addition to the operation rod 50 of the valve operating unit 5 already described in FIGS. 3, 4, 7, and 8, the following support is provided. Since it is supported by the structure and moved back and forth, the control valve device 2 can be compactly and collectively installed on the upper part of the transmission case 1d without increasing the size, and when the control valve 20 is switched, the spool can be installed. The expansion / contraction operation can be smoothly performed without any biting.

That is, as shown in FIGS. 7 and 8, the operating rod 50
Is for locking one end of a spring 56 for spool return with the operation hole 55 formed on the rear end (free end) side in a state where the operation bracket portion 53 is connected to and supported by the main spool 21 of the control valve 20. It is slidably fitted and supported on the support shaft 38. At this time, the support shaft 38 moves from the valve case 3 at a position facing the operation hole 55,
The shaft support seat 37 is integrally formed so as to project in the length of sliding contact with the side surface of the operating rod 50.

The operating rod 50 is linearly arranged rearward on a substantially coaxial line without being largely displaced from the main spool 21 in a plan view, and the support shaft 38 is fitted in the operating hole 55 on the rear end side. In the inserted state, the shaft support seat 37 on which the support shaft 38 is erected is used as a guide member, the end surface of which is formed as a guide surface 37a, and the rear surface of the operating rod 50 is slidably positioned by the guide surface 37a. It is configured to guide you.

Further, when the spring 56 of the valve operating portion 5 is stretched by the operating bracket portion 53 extending to the opposite side of the valve case 3 and the tip of the support shaft 38 in plan view, each operating piece and the balance rod. While preventing contact between the operating rod 50 and the like, the spring 56 reduces the momentum in the galling direction of the main spool 21 due to the return urging force of the spring 56,
The side surface of the operating hole 55 located at the rear of the operating rod 50 is pressed against the guide surface 37a side of the shaft support seat 37 with elastic force to stably position and slide the operating rod 50 on the rear side. I am trying.

Therefore, in the control valve device 2 constructed as described above, the other end of the spring 56 connecting one end to the actuating rod 50 is erected from the shaft support seat 37 integrally projecting from the valve case 3. The spool 21 is extended and retracted while being locked to the supporting shaft 38 to be installed and slidingly contacting the operating rod 50 with the shaft support seat 37 of the supporting shaft 38. With the main spool 21 supported, the rear side is supported by the support shaft 38 and the operation hole 5
5 is inserted and supported, and the end face of the shaft support seat 37 on which the support shaft 38 is erected is positioned laterally by using the guide surface 37a as a side position.
Can be performed linearly on the substantially coaxial line, and at the time of the switching operation of the control valve 20, the expansion / contraction operation can be smoothly performed without causing galling on the spools such as the main spool 21 and the lower spool 22.

The support shaft 38 for locking the spring 56 serves as a support guide for inserting and supporting the rear side of the operating rod 50, and the shaft support seat 37 of the support shaft 38 is slidable on the rear side of the operating rod 50. Since the guide surface 37a for positioning and guiding is also used as a guide member, the support portion of the spring 56 and the operating rod 50 has a different structure so that the structure is common and the number of parts is reduced. At the same time, since the operating rod 50 can be provided side by side with the spring 56 with substantially the same length without making the operating rod 50 rearward,
While the positioning in the moving direction is stable, the control valve device 2 can be installed in the transmission case 1d compactly with a simple and inexpensive structure without increasing the size.

In the control valve device 2 constructed as described above, the operating rod 50 is connected to the main spool 21 of the control valve 20 by connecting the operating bracket portion 53 of the operating rod 50 with a margin. When moving back and forth, it is possible to buffer an unexpected load and the like due to the swinging of the spring 56 due to the vibration of the machine body, etc. Therefore, it is possible to smoothly perform the expansion and contraction operation of the spool without causing galling or the like. .

That is, the operating bracket portion 53 of the operating rod 50.
As described above, the main spool 21 is inserted into the end portion of the main spool 21 through the large-diameter mounting hole 53a, and a small gap L is provided between the main spool 21 and the nut 2N on the front side for fixing the connecting rod 25. By positioning and coupling, the operation bracket portion 53 is provided with a small gap L with the fool hole of the mounting hole 53a.
By this, it is possible to have a margin for freely moving the operating bracket portion 53 back and forth and within a small allowance, and through this accommodation margin, the operating bracket portion 53 is freely supported in accordance with the pulling direction of the spring 56. Therefore, since the operating bracket portion 53 is flexibly supported in the state of being positioned in the returning direction with respect to the main spool 21, even if there is an assembly error or a processing error in each component member, or when the operating rod 50 moves back and forth. Spring 5 due to machine vibration etc.
Even if 6 or the operating rod 50 sways, the spring 56 and the operating rod 50 buffer the main spool 21 by the accommodation allowance without imposing an unreasonable load on the main spool 21, and the expansion and contraction operation of each spool without the galling is simple and inexpensive. With the configuration, it can be performed smoothly.

In the above construction, the operating rod 50 may have the rear portion having the operating hole 55 directly in sliding contact with the guide surface 37a of the shaft support seat 37, but it operates with the guide surface 37a. A liner 39 may be interposed between the rods 50 by means as shown in FIG. 9. In this case, in the case where the shaft support seat 37 is integrally formed on the valve case 3 with, for example, an aluminum casting material, While the abrasion of the shaft support seat 37 is prevented, the initial friction of the operation of the operation rod 50 is reduced, and the forward and backward movement is performed lightly.

That is, the liner 39 shown in FIG. 9 is a disk-shaped washer having a smooth surface with a predetermined diameter, and the mounting hole 39a formed in the center of the liner 39 is made larger than the diameter of the support shaft 38 so as to fit both of them. In this state, at least a swing gap in the left-right direction (gap with play) is provided. Then, as shown in FIGS. 7 and 8, first, the liner 39 is fitted and inserted into the support shaft 38, and then the actuating rod 50 is fitted and supported through the actuating hole 55 to be assembled.

Therefore, in the control valve device 2 configured as described above, when the operating rod 50 moves from the stationary state toward the front or rear side, the liner 39 is moved by the swing gap at the start of the movement. Since the operating rod 50 is moved in the moving direction, the initial friction between the operating rod 50 and the shaft support seat 37 can be reduced, and even if the lubrication to this portion is insufficient, the operating rod 50 can be moved. Since it is performed lightly and does not damage the shaft support seat 37 of the support shaft 38, the shaft support seat 3
There is an advantage that it is not necessary to replace the valve case 3 in which 7 is integrally formed of cast aluminum.

The control valve device 2 constructed as described above has the operating rod 5 as shown in FIGS. 13 and 14.
0 is also provided with an operating hole 55 on the front side thereof, and the valve case 3 has a structure similar to that of the support structure described above in the operating hole 55.
The guide rod may be slidably guided by the shaft support seat 37 and the support shaft 38 projecting from the side, and in this case, the operating rod 50 is positioned at a plurality of positions in the front and rear, and can be moved forward and backward while appropriately preventing shaking. It can be done smoothly.

[0036]

Since the present invention is the control valve device configured as described above, it has the following effects. (1) A hydraulic cylinder that supports a work machine or the like mounted on a traveling machine body so as to be able to move up and down, a control valve that is installed in a valve case and that supplies hydraulic oil to the hydraulic cylinder in a switchable manner, and a main spool of the control valve. An operating rod that is connected so as to perform expansion and contraction operation, and a spring that is connected to the operating rod and urges the main spool in the return direction.The other end of the spring that connects one end to the operating rod is attached to the valve case. The supporting rod is locked to the supporting shaft, and the operating rod is guided and supported by the shaft supporting seat of the valve case to which the supporting shaft is attached, so that the main spool is expanded and contracted. In the state of being supported by, since the end face of the shaft support for vertically arranging the support shaft is used as a guide surface for lateral positioning,
The longitudinal movement of the operating rod can be linearly performed on the substantially coaxial line of the main spool, and the expansion / contraction operation of the main spool can be smoothly performed without causing galling of the spool. Further, since the spring and the supporting portion of the actuating rod are made common without having a separate structure, and the actuating rod and the spring are provided side by side, the control valve device can be made compact with a simple and inexpensive structure.

(2) When the operating rod is moved from the stationary state, the liner sways when the operating rod is guided and supported by the shaft support through the liner fitted with the supporting shaft with a swing gap. Since the initial friction is reduced by following the moving gap in the moving direction of the operating rod, the operating rod can be moved easily and abrasion of the shaft support seat can be prevented.

(3) Since the operating bracket portion of the operating rod is connected to the main spool of the control valve with a margin of allowance, the load accompanying the swing of the spring due to the vibration of the machine body etc. when the operating rod moves. And the like are buffered by the accommodation allowance of the operation bracket portion, so that the spool can be operated smoothly.

[Brief description of drawings]

FIG. 1 is a side view of a tractor including a control valve device according to the present invention.

FIG. 2 is a plan view of the control valve device shown in FIG.

FIG. 3 is a plan view showing a configuration of a main part of the control valve device of FIG.

FIG. 4 is a side view of FIG.

5 is a side sectional view showing the structure of the valve operating portion of FIG.

FIG. 6 is a hydraulic circuit diagram of a control valve device.

FIG. 7 is a plan view showing a support structure of an operating rod of the control valve device according to the present invention.

FIG. 8 is a side view of FIG. 7.

FIG. 9 is a side view of the liner.

FIG. 10 is a side view showing a neutral state of the valve operating portion.

11 is a side view showing a state in which the valve operating portion of FIG. 10 is in a raising operation from a neutral state.

FIG. 12 is a side view showing the operation of the valve operating portion of FIG. 11 from the raising operation state to the neutral state.

FIG. 13 is a plan view showing a support structure for an operating rod according to another embodiment of the present invention.

FIG. 14 is a side view of FIG.

[Explanation of symbols]

1 tractor 1c traveling aircraft 2 Control valve device 3 valve case 5 Valve operating part 10 lift arm 11 hydraulic cylinder 20 control valve 21 Main spool 37 Shaft support 38 Support shaft 39 Liner 50 operating rod 53 Operation bracket part 53a Mounting hole 55 Working hole 56 spring L small gap

Claims (3)

[Claims] 1. A working machine (1) mounted on a traveling machine body (1c).
2) A hydraulic cylinder (11) that supports the like so that it can move up and down,
A control valve (20) that is installed in a valve case (3) and that supplies hydraulic oil to a hydraulic cylinder (11) in a switchable manner, and a main spool (21) of the control valve (20) are connected so as to extend and contract. An operating rod (50) and a spring (56) that is connected to the operating rod (50) and biases the main spool (21) in the return direction, the spring having one end connected to the operating rod (50). Connect the other end of (56) to the valve case (3).
The shaft support seat (3) of the valve case (3) which is locked to the support shaft (38) attached to the
7) A control valve device for a traveling work machine configured to guide and support the operating rod (50) to the main spool (21) to extend and contract. 2. The actuating rod (50) is guided and supported on the side of the shaft support (37) through a liner (39) fitted to the support shaft (38) with a swing gap. Control valve device for mobile work equipment. 3. The traveling working machine according to claim 1, wherein the main spool (21) of the control valve (20) is connected to the operating bracket portion (53) of the operating rod (50) with a margin. Control valve device.