JPS6159436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control valve switching device for switching two control valves.

BACKGROUND OF THE INVENTION Conventionally, for example, in an earthmoving vehicle, a working device having a working member such as a swingable and slidable blade is installed at the front end of the earthmoving vehicle. Such a working device has a first support mounted on the front end of an earthmoving vehicle, and a second support mounted on the first support in a freely pivotable manner, and includes a working member such as the blade. is slidably mounted on the second support. Between the first support body and the second support body, both left and right hydraulic cylinder mechanisms for angle are interposed, respectively, and between the second support body and the work member. A sliding hydraulic cylinder mechanism is interposed for sliding.

In an earthmoving vehicle equipped with such a working device, the angle lever is rotated in a predetermined direction to operate the angle control valve, thereby contracting the right angle fluid pressure cylinder mechanism and contracting the angle left fluid pressure cylinder mechanism. When extended, the working member is rotated to the right together with the second support, and conversely, the angle lever is operated in a direction opposite to the predetermined direction to operate the angle control valve, and the angle control valve is activated. When the right angle hydraulic cylinder mechanism is contracted and the right angle hydraulic cylinder mechanism is extended, the working member is rotated to the left together with the second support. Furthermore, when the slide lever is operated in a predetermined direction to activate the slide control valve and extend (or contract) the slide fluid pressure cylinder mechanism, the working member is moved to the right, and conversely, the slide When the lever is operated in a direction opposite to the predetermined direction to operate the slide control valve and contract (or extend) the slide hydraulic cylinder mechanism, the working member is moved to the left.

However, in the above-mentioned earthmoving vehicle, an angle lever for rotating the work member and a slide lever for sliding the work member are required, and a lever for lifting and tilting the work member is required. A total of four operating levers must be installed on the driver's seat, so
Slide levers or angle levers that are rarely used are located at a distance from the driver's seat, and the operability of these slide or angle levers is worse than that of lift or tilt levers. Furthermore, due to the increased number of operating levers, there is a problem in that it is not easy to operate these levers, and there is a possibility that such operations may occur.

The present invention has been made in view of the above facts, and its object is to provide a novel control valve switching device that can control two control valves separately and independently using a single lever mechanism having an operating section. The goal is to provide the following.

According to the present invention, there is provided a lever mechanism including a first lever member having an operating portion and a second lever member to which the first lever member is attached, and a first lever mechanism for operating a first control valve. a control valve actuation mechanism; and a second control valve actuation mechanism for actuating a second control valve, the first lever member being rotatable in a first predetermined direction, and the second lever member being rotatable in a first predetermined direction. the second lever member is rotatably attached to the mounting body in a second predetermined direction, and the first control valve actuation mechanism is connected to the first lever member;
Further, the second control valve actuation mechanism is connected to the second lever member, and when the operating portion is moved in the first predetermined direction, the first lever member is connected to the second lever member. is rotated in the first predetermined direction, thereby operating the first control valve via the first control valve actuation mechanism, while rotating the operating portion in the second predetermined direction. When the first lever member and the second lever member are moved to the second predetermined direction with respect to the mounting body, the second lever member is rotated in the second predetermined direction. There is provided a control valve switching device characterized in that the second control valve is actuated.

Hereinafter, preferred embodiments of a control valve switching device constructed in accordance with the present invention will be described with reference to the accompanying drawings.
In the following specific example, an example in which a control valve switching device configured according to the present invention is applied to an earthmoving vehicle will be described, but the present invention is not limited to the following specific example, and may be applied to other general It can also be applied to devices, machines, etc.

In FIGS. 1 and 2, the control valve switching device includes a lever mechanism 2, a first control valve actuation mechanism 4 (see FIG. 2), and a second control valve actuation mechanism 6.

The lever mechanism 2 (see FIG. 1) includes a first lever member 8 and a second lever member 10, and the first lever member 8 has a substantially rectangular parallelepiped-shaped base 12,
It has an operating section 14 fixed (for example, screwed) to the upper surface of the base 12 and a protrusion 16 (acting as a connecting section) formed on one side of the base 12. A recess 18 is formed in one end of the second lever member 10 , into which the base 12 of the first lever member 8 is attached by means of a pin 20 to the arrows 22 and 2 .
It is mounted rotatably in a first predetermined direction indicated by 3. The second lever member 10 has a substantially central portion thereof fixed to a part of the earthmoving vehicle main body 24 (constituting the mounting main body). It is rotatably mounted in two predetermined directions. Therefore, in the lever mechanism 2 consisting of the first lever member 8 and the second lever member 10 described above, the operating portion 1
4 in a first predetermined direction (directions shown by arrows 23 and 24), the first lever member 8 moves in the first predetermined direction about the pin 20 relative to the second lever member 10. When the operating portion 14 is rotated in a second predetermined direction (the direction indicated by arrows 30 and 31), the first lever member 8 and the second lever member are rotated relative to the vehicle body 24. 10
is rotated about the pin 28 in a second predetermined direction.

The pin 28 is further provided with a tilt lever 32 and a lift lever 34 of the earthmoving vehicle in a predetermined direction (substantially the same direction as the second predetermined direction), as shown by the two-dot chain line in FIG. ) is rotatably mounted.

In addition, the first control valve actuation mechanism 4 (see Fig. 2)
is equipped with a transmission wire 36, a transmission lever 38, and a pressing device 40. The transmission wire 36 is
It is composed of a transmission member 42, an inner tube member 44 that protects the transmission member 42, and an outer tube member 46 that covers the inner tube member 44. The transmission member 42 has male threaded portions 47a and 47b formed at both ends thereof, and the male threaded portion 47a (see FIG. 1) at one end is connected to the protrusion 16 of the first lever member 8 by a pin 48. A pair of nuts 5 are attached to a substantially U-shaped connecting member 50 that is rotatably attached.
2, and the male threaded portion 47b at the other end is screwed into a male threaded portion (not shown) formed at one end of a connecting rod 54 rotatably attached to one end of the lever 38. and is fixed with a nut 56. In addition, the inner tube member 4
4 has male threaded parts 58a and 58b formed at both ends thereof, and a male threaded part 58a at one end thereof.
(see FIG. 1) is fixed to a protrusion 60 fixed to the other end of the second lever member 10 by a pair of nuts 62 (only one side is shown in FIG. 1), and a male threaded portion at the other end. 58b is fixed by a pair of nuts 66 to a mounting plate 64 fixed to the earthmoving vehicle body.

The pressing device 40 includes a rod member 68 whose one end is rotatably attached to the lever 38, a washer member 70, and a collar member 72. A nut 74 and a collar member 72 are screwed through 70. One end surface of the collar member 72 is connected to a pair of angle fluid pressure cylinder mechanisms 76a and 76b (see FIG. 4) or a slide fluid pressure cylinder mechanism 7 for supplying fluid in an earthmoving vehicle.
8 (see FIG. 4) of the auxiliary directional control valve 80 (constituting the first control valve).
A spring member 82 is mounted between the washer member 70 and the auxiliary directional control valve 80 so as to cover the collar member 72 and the spool 81.

Therefore, in the first control valve actuation mechanism 4 having the above-described configuration, when the operating portion 14 of the first lever member 8 is rotated in the direction shown by the arrow 22, the force is transmitted against the force of the spring member 82, for example. wire 36
transmission member 42, connection rod 54, lever 38,
The spool 81 of the auxiliary directional control valve 80 is pressed through the rod member 68 and the collar member 72,
The secondary directional control valve 80 is switched.

Furthermore, the second control valve actuation mechanism 6 (see FIG. 1) includes a connecting rod member 84. One end of the connecting rod member 84 is rotatably connected to the other end of the second lever member 12 by a pin 86, and the other end is attached to the earthmoving vehicle.
The lever of the main direction control valve 86 (see FIG. 4, constituting a second control valve) that controls the fluid supplied to the pair of angle fluid pressure cylinder mechanisms 76a and 76b or the slide fluid pressure cylinder mechanism 78. (not shown).

Therefore, in the second control valve operating mechanism 6 having the above-described configuration, for example, when the operating portion 14 of the first lever member 8 is rotated in the direction of the arrow 30 (or 31), the The main directional control valve 86 is then switched.

The lever mechanism 2 configured as described above is covered by a cover member 88 shown in FIG. The cover member 88 includes an H-shaped hole 90 for the lever mechanism 2 and a tilt lever 3.
Elongated hole 92 for 2 and lift lever 34
Elongated holes 94 are formed for each. When the operating section 14 of the lever mechanism 2 is in the inoperative state shown in FIG. 1 (the operating section 14 is not rotated), it is positioned at the neutral position shown by the solid line in FIG. to arrow 30 (or 3
When rotated in the direction shown in 1), the two-dot chain line 14
When it is positioned at the position indicated by A (or 14B) and rotated in the direction indicated by the arrow 22 from the above-mentioned neutral position, it is positioned as indicated by the two-dot chain line 14C, and from this state it is further moved to the position indicated by the arrow 30 (or When it is rotated in the direction shown by 31), it is positioned at the position shown by two-dot chain line 14D (or 14E).

Next, the effects of the control valve switching device as described above will be explained.

When operating the main direction control valve 86, the first
The operating portion 14 is rotated in the direction shown by the arrow 30 (or 31) from the neutral position shown in the figure (indicated by the solid line in FIG. 3).
Position it in the position shown in B). Thus, the first
The second lever member 10 together with the lever member 8 is rotated in the direction shown by the arrow 30 (or 31), and the main directional control valve 86 is switched via the connecting rod 84.

On the other hand, when operating the auxiliary directional control valve 80, the operating portion 14 is rotated from the neutral position shown in FIG. 1 in the direction shown by the arrow 22 and positioned at the position shown by the two-dot chain line 14C in FIG. In this way, the first lever member 8 with respect to the second lever member 10
is rotated in the direction shown by arrow 22, and the secondary directional control valve 80 is switched via the transmission member 42, the connecting rod 54, the lever 38, the rod member 68, and the collar member 72. If the main direction control valve 86 is to be further operated from this state, the operating portion 14 is further rotated in the direction shown by the arrow 30 (or 31) from the position shown by the two-dot chain line 14C. It is positioned at the position indicated by the two-dot chain line 14D (or 14E). In this way, the first lever member 8
At the same time, the second lever member 10 is rotated,
The main directional control valve 86 is switched via the connecting rod 84 (at this time, the auxiliary directional control valve 80 is maintained in the switched state).

In this specific example, when the operating section 14 is at the position indicated by the two-dot chain line 14C in FIG. 3, it is automatically positioned at the neutral position indicated by the solid line in FIG. 3 by the action of the spring member 82. .

As described above, in the control valve switching device described above, two control valves can be controlled separately and independently with a single lever mechanism, and when a large number of levers are used, the number of levers can be reduced. This can improve operability.

The control valve switching device as described above is used, for example, in an earthmoving vehicle (which is known per se, in which a working member is rotated or slid by a pair of angle hydraulic cylinder mechanisms and a sliding hydraulic cylinder mechanism, as shown in FIG. 4). Fluid pressure control circuit 96 in an earthmoving vehicle
It is applied to the switching operation of the main directional control valve 86 and the auxiliary directional control valve 80 inside.

In FIG. 4, fluid pressure control circuit 96 includes a pressure fluid reservoir 98 containing pressure fluid, such as pressure oil;
A supply source 100 such as a hydraulic pump for supplying pressure fluid from the pressure fluid reservoir 98, the main directional control valve 86, and the auxiliary directional control valve 80 are provided.

Between the oil supply source 100 and the main directional control valve 86,
A first oil supply passage 102 and a second oil supply passage 104 branching from this first oil supply passage 102 are provided, and a check valve 10 is provided in this second oil supply passage 104.
6 are arranged. A first return passage 108 is provided between the main directional control valve 86 and the fluid pressure reservoir 98;
A second return flow path 110 connected to the first return flow path 108 is provided. Furthermore, a right main flow path 112a and a left main flow path 112b are provided between the main direction control valve 86 and the sub direction control valve 80, and between this right main flow path 112a and the second return flow path 110, A right relief passage 116a having a relief valve 114a is disposed, and a relief valve 11 is disposed between the left main passage 112b and the second return passage 110.
A left relief channel 116b having a diameter of 4b is provided.

Further, the sub-directional control valve 80 and a pair of angle fluid pressure cylinder mechanisms 76a and 76b (for example, number 76a is a right angle fluid pressure cylinder mechanism, and number 76b is an angle left fluid pressure cylinder mechanism). In between, there is a right-handed swirl flow path 124a.
(Connected to the contraction side of the right angle fluid pressure cylinder mechanism 76a and the extension side of the left angle fluid pressure cylinder mechanism 76b) and the left turning flow path 12
4b (the extension side of the right angle fluid pressure cylinder mechanism 76a and the angle fluid pressure cylinder mechanism 76b)
Connected to the contraction side of. ) is provided, and an extension flow path 126a is provided between the sub-directional control valve 80 and the sliding fluid pressure cylinder mechanism 78.
(The contraction side of the sliding fluid pressure cylinder mechanism 78,
Therefore, it is connected to the head side. ) and contraction channel 126b (sliding fluid pressure cylinder mechanism 78
is connected to the extension side and therefore to the rod side. )
is installed.

In the control circuit 96 described above, when turning the work member (not shown) to the right, the control valve switching device is shown in FIG. 1, and from the neutral position shown by the solid line in FIG. 3 and position it at the position shown by the two-dot chain line 14A in FIG. The main directional control valve 86 is then actuated via the connecting rod member 84 and positioned in the first position. When the main directional control valve 86 is positioned at the first position, the second oil supply flow path 104 is connected to the left main flow path 112b, and the first return flow path 108 is connected to the right main flow path 112a. . On the other hand, since the sub-control valve 80 is not operated, the right main flow path 112a is connected to the left rotation flow path 124b, and the left main flow path 112b is connected to the right rotation flow path 124a, as shown in FIG. .

Therefore, from the supply source 100 to the second oil supply channel 10
4. Right angle fluid pressure cylinder mechanism 76a via left main flow path 112b and right rotation flow path 124a.
Left fluid pressure cylinder mechanism 7 for contraction side and angle
Pressure fluid is supplied to the extension side of 6b. Further, from the extension side of the right angle fluid pressure cylinder mechanism 76a and the contraction side of the left angle fluid pressure cylinder mechanism 76b, the left turning flow path 124b, the right main flow path 112a
The pressure fluid is returned to the pressure fluid reservoir 98 via the first return flow path 108. Thus,
The right fluid pressure cylinder mechanism 76a for angle is contracted and the left fluid pressure cylinder mechanism 76 for angle is contracted.
b is extended, which causes the second support (not shown) of the working element to pivot to the right together with the working element (not shown).

In addition, when turning the actuating member (not shown) to the left, move the operating section 14 from the neutral position to the direction indicated by the arrow 31.
Rotate it in the direction shown by the two-dot chain line 14 in Figure 3.
Attach it to the position indicated by B. The main directional control valve 86 is then actuated via the connecting rod member 84 and positioned in the second position. When the main directional control valve 86 is positioned at the second position, the second oil supply flow path 104 is connected to the right main flow path 112a, and the first return flow path 108 is connected to the left main flow path 112a.
connected to b. On the other hand, also at this time, the sub control valve 8
0 is not activated, the right main flow path 112a
is connected to the left turning flow path 124b, and the left main flow path 11
2b is connected to the right-handed swirl flow path 124a.

Therefore, from the oil supply source 100 to the second oil supply channel 10
4. The extension side of the right fluid pressure cylinder for angle 76a and the left fluid pressure cylinder mechanism for angle 76b via the right main flow path 112a and the left turning flow path 124b.
Pressure fluid is supplied to the contraction side of the. Further, pressure fluid is supplied from the contraction side of the right angle fluid pressure cylinder mechanism 76a and the extension side of the left angle fluid pressure cylinder mechanism 76b through the right swirl flow path 124a, the left main flow path 112b, and the first return path 108. It is returned to the pressure reservoir 98. Thus, the left angle hydraulic cylinder mechanism 76a is retracted and the right angle hydraulic cylinder mechanism 76b is extended, and contrary to the above, the second support (not shown) is moved by the actuating member (not shown). ) and is forced to turn left.

On the other hand, when moving the work member (not shown) to the right, first rotate the operating section 14 from the neutral position in the direction indicated by the arrow 22 and position it at the position indicated by the two-dot chain line 14C in FIG. Thereafter, it is further rotated in the direction shown by the arrow 30 and positioned at the position shown by the two-dot chain line 14D in FIG.

When the operating portion 14 is rotated in the direction shown by the arrow 22 and positioned at the position shown by the double chain line 14C, the auxiliary directional control valve is connected via the transmission member 42, the connecting rod 54, the lever 38, the rod member 68, and the collar member 72. 80 is switched, the right main flow path 112a is connected to the extension flow path 126a, and the left main flow path 112 is connected to the extension flow path 126a.
b is connected to the contraction channel 126b. Next, when the operating portion 14 is rotated in the direction indicated by the arrow 30 and positioned from the position indicated by the two-dot chain line 14C to the position indicated by the two-dot chain line 14D, the main directional control valve 86 is moved to the first position via the connecting rod member 84. As described above, the second oil supply flow path 104 is connected to the left main flow path 112b, and the first return flow path 108 is connected to the right main flow path 112a.

Therefore, from the oil supply source 100 to the second oil supply channel 10
4. Pressure fluid is supplied to the contraction side of the sliding fluid pressure cylinder mechanism 78 via the left main channel 112b and the contraction channel 126b, and from the extension side of the slide fluid pressure cylinder mechanism 78 to the extension channel 126.
a, right main flow path 112a and first return flow path 108
Pressure fluid is returned to pressure fluid reservoir 98 via.
The sliding hydraulic cylinder mechanism 78 is thus retracted, thereby causing the working member 4 (not shown) to move to the right relative to the second support (not shown) of the working device.

When moving the work member (not shown) to the left, first rotate the operating section 14 from the neutral position in the direction indicated by the arrow 22 and position it at the position indicated by the two-dot chain line 14C in FIG. Thereafter, it is further rotated in the direction shown by the arrow 31 and positioned at the position shown by the two-dot chain line 14E in FIG.

When the operating portion 14 is rotated in the direction shown by the arrow 22 and positioned at the position shown by the two-dot chain line 14C, the auxiliary directional control valve 80 is switched as described above, and the right main flow path 112a is connected to the extension flow path 126a. At the same time, the left main flow path 112b is connected to the contraction flow path 126b. Next, when the operating portion 14 is rotated in the direction shown by the arrow 31 and positioned from the position shown by the two-dot chain line 14C to the position shown by the two-dot chain line 14E, the main directional control valve 8 is opened via the connecting rod member 84.
6 is positioned at the second position, the second oil supply flow path 104 is connected to the right main flow path 112a,
A first return flow path 108 is connected to the left main flow path 112b.

Therefore, from the oil supply source 100 to the second oil supply channel 10
4. Pressure fluid is supplied to the extension side of the sliding fluid pressure cylinder mechanism 78 via the right main channel 112a and the extension channel 126a, and from the contraction side of the slide fluid pressure cylinder mechanism 78 to the contraction channel 126.
b, left main flow path 112b and first return flow path 108
Pressure fluid is returned to pressure fluid reservoir 98 via.
The sliding hydraulic cylinder mechanism 78 is thus extended, thereby causing the working member (not shown) to move to the left relative to the second support (not shown) of the working device.

In the earth-moving vehicle equipped with the control valve switching device and the fluid pressure control circuit 96, when the earth-moving vehicle is working, the operating portion 14 of the lever mechanism 2 is positioned at the neutral position shown in FIG. 1 and indicated by solid lines in FIG. 3, and the main directional control valve 86 and the auxiliary directional control valve 80 are held in the state shown in FIG. 4.

Therefore, when an impact force (for example, generated when the end of the work member collides with an obstacle such as a curb on the road surface) is applied to the work member (not shown) during work with an earthmoving vehicle, Right turning flow path 124a
(or the left turning flow path 124b), the relief valve 114b (or relief valve 114a) is opened, the left body pressure cylinder mechanism 76b for angle is contracted (or expanded), and the right fluid pressure for angle is The cylinder mechanism 76a is extended (or contracted), and the work member turns left (or turns right).
I am forced to do it. In this way, even when an impact force is applied to the working member, the angle left and right cylinder mechanism 7
Damage to 6a and 76b can be prevented.

Furthermore, in this state, as can be easily understood from FIG. Pressure fluid reservoir 98 via 108
will be returned to.

In the illustrated control valve switching device, a spring member 82 is interposed between the washer member 70 and the auxiliary directional control valve 80, and when the operating portion 14 is in the position shown by the two-dot chain line 14C in FIG. By the action of this spring member 82, it is automatically positioned at the neutral position shown by the solid line in FIG. This is because when an impact force is applied to a work member (not shown), a larger impact force is applied to the angle fluid pressure cylinder mechanisms 76a and 76b than to the slide fluid pressure cylinder mechanism 78. Also, the angle fluid pressure cylinder mechanism 76a
and 76b are more likely to be damaged than the sliding hydraulic cylinder mechanism 78. ) The angle fluid pressure cylinder mechanism 76 is generated by this impact force.
This is to prevent damage to a and 76b.

When the above-mentioned control valve switching device is applied to the control of the above-mentioned hydraulic control circuit, a main directional control valve that controls the angle fluid pressure cylinder mechanism and a main directional control valve that controls the slide fluid pressure cylinder mechanism are further added. This has the advantage that the same function can be provided at a lower cost than the conventional system using individual main directional control valves.

Although specific examples of the control valve switching device configured according to the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such specific examples.
Various modifications and variations can be made without departing from the scope of the invention. As described in detail above, in the control valve switching device constructed according to the present invention, when the operating section 14 is moved in the first predetermined direction, the first lever member 8 is moved to the second lever member 10. When the operating portion 14 is rotated in the first predetermined direction, and the operating portion 14 is moved in the second predetermined direction, the second lever member 10 is rotated together with the first lever member 8.
is rotated in the second predetermined direction with respect to the mounting body, and thus the single lever mechanism 2 is rotated by utilizing the movement of the first lever member 8 and the second lever member 10.
The two control valves 80 and 86 can be controlled separately and independently, and when a large number of levers are used, the number of levers can be reduced to improve operability.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted perspective view illustrating a lever mechanism of a control valve switching device constructed according to the present invention. FIG. 2 is a partially cutaway sectional view illustrating a first control valve actuation mechanism of a control valve switching device constructed in accordance with the present invention. 3 is a plan view showing a cover member that covers the lever mechanism shown in FIG. 1; FIG. FIG. 4 is a simplified diagram showing a fluid pressure control circuit in an earthmoving vehicle equipped with a control valve switching device constructed in accordance with the present invention. 2... Lever mechanism, 4... First control valve actuation mechanism, 6... Second control valve actuation mechanism, 8... First lever member, 10... Second lever member, 14...
...Operation unit, 24...Vehicle body (mounting body), 80
... Sub-directional control valve (first control valve), 86... Main direction control valve (second control valve).

Claims (1)

[Scope of Claims] 1. A first lever member having an operation part and the first lever member
a lever mechanism consisting of a second lever member to which a lever member is attached; a first control valve actuation mechanism for actuating the first control valve; and a second control valve actuation mechanism for actuating the second control valve. a control valve actuation mechanism, the first lever member is rotatably attached to the second lever member in a first predetermined direction, and the second lever member is rotatably mounted in a second predetermined direction. The first control valve actuation mechanism is rotatably attached to the mounting body, and the first control valve actuation mechanism is connected to the first lever member, and the second control valve actuation mechanism is connected to the second lever member. When the operating portion is moved in the first predetermined direction, the first lever member is rotated in the first predetermined direction with respect to the second lever member, and thereby the first lever member is rotated in the first predetermined direction with respect to the second lever member. When the first control valve is actuated via the first control valve actuation mechanism and the operating portion is moved in the second predetermined direction, the second lever member and the first lever member are moved in the second predetermined direction. A control valve switching device characterized in that the second control valve is rotated in the second predetermined direction with respect to the mounting body, whereby the second control valve is actuated via the second control valve actuation mechanism. Device. 2. The first lever member has a base, an operating part and a connecting part provided on the base, and the first control valve actuation mechanism is connected to the connecting part, and the second lever member A recess is formed in one end of the member, the first lever member is rotatably mounted in the recess in the first predetermined direction, and the second lever member is installed in the other end.
A control valve operating mechanism is connected to the control valve operating mechanism, and when the operating section is moved in the first predetermined direction, the first lever member is rotated relative to the second lever member, and the operating section is rotated. The control valve switching device according to claim 1, wherein when the control valve switching device is moved in the second predetermined direction, the second lever member is rotated together with the first lever member relative to the mounting body. 3. The first control valve actuation mechanism includes a transmission wire connected to the first lever member, a pressing device that presses the spool of the first control valve, and a transmission wire and pressing device that press the spool of the first control valve. A transmission lever is interposed therebetween, and the pressing device includes a rod member having one end rotatably connected to the transmission lever, a washer member attached to the rod member, and a washer member attached to the other end of the rod member. Claim 1, further comprising a collar member mounted and pressing against the spool of the first control valve, and a spring member mounted between the washer member and the first control valve. Or the control valve switching device according to item 2. 4. The first control valve is a sub-directional control valve for switching the fluid supply to a pair of angle fluid pressure cylinder mechanisms or slide fluid pressure cylinder mechanisms in the earthmoving vehicle; Claims 1 to 3, wherein the valve is a main directional control valve for controlling the fluid supplied to the pair of angle hydraulic cylinder mechanisms or the slide hydraulic cylinder mechanism in the earthmoving vehicle. 2. The control valve switching device according to any one of the items.