JPS6121660Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an operating device for slidingly displacing each spool in a valve device having two parallel spools.

In other words, various operating mechanisms have already been proposed in which each of two operated objects can be operated with a single operating lever, but this invention is based on a system in which each of the two spools is slid by a single operating lever. An operating device configured to perform displacement operation, which includes two operating levers for sliding displacement of one spool.
It is designed to be able to easily replace the operating mechanism equipped with this, and to reduce the number of components on the valve device side.
It is an object of the present invention to provide a novel operating device for a valve device.

The configuration of the operating device according to the present invention will be explained with regard to the illustrated embodiment.This embodiment relates to an example in which the present invention is implemented in a front loader as shown in FIG. In this front loader, a lift arm 4 is supported by a support structure 3 erected on a body that is driven by left and right front wheels 1 and rear wheels 2 so as to be rotatable up and down.
A bucket 5 is rotatably supported at the tip of the machine, and a pair of left and right lift cylinders 6 are provided between the fuselage and the lift arm 4, and a tilt cylinder 7 is provided between the lift arm 4 and the bucket 5. It is composed of things. A valve device 9, as shown in the circuit diagram in FIG. 2, is provided near the passenger seat 8 on the fuselage.

As shown in FIG. 2, the valve device 9 includes a first control valve 11 that switches and controls the supply and discharge of hydraulic pressure to both lift cylinders 6, and a second control valve that switches and controls the supply and discharge of hydraulic pressure to and from the tilt cylinder 7.
A control valve 11 is provided. In FIG. 2, 12 is an oil tank, 13 is a hydraulic pump, and the first control valve 10 is connected to both oil chambers 6a and 6 of the lift cylinder 6, as shown in the figure.
a neutral position N in which the lift cylinder 6 is stopped by blocking the ends of the circuits 14 and 15 connected to the hydraulic pump 13 and the contraction oil chamber 6b; The connected circuits 15 are connected to the oil tank 12 at a lifting action position U for lifting the lift cylinder 6, and the circuits 15 are connected to the hydraulic pump 13.
There is also a lowering action position D in which the circuits 14 are connected to the oil tank 12 to move the lift cylinder 6 down, and a lowering action position D in which both the circuits 14 and 15 are connected to the oil tank 12 to deactivate the lift cylinder 6 and lift the lift arm. 4 is in a floating state. On the other hand, the second control valve 11 has a circuit 16 connected to both oil chambers 7a and 7b of the tilt cylinder 7, respectively.
a neutral position N where the tilt cylinder 7 is stopped by blocking the 17 end; a damping position where both the circuits 16 and 17 are connected to the hydraulic pump 13; and a damping position where the circuit 17 connected to the reduction oil chamber 7b is connected to the hydraulic pump 13. 13 and a tilting position where a circuit 16 connected to the extension oil chamber 7a is connected to the oil tank 12 to tilt the tilt cylinder 7. Tilt cylinder 7 shown
As schematically shown in FIG. 2, the pressure receiving area of the piston 7c facing the expansion oil chamber 7a is _S1 , whereas the pressure receiving area of the piston 7c facing the contraction oil chamber 7b is S1. Let be the area S ₁ - S ₀ obtained by subtracting the cross-sectional area S ₀ of the piston rod 7d from the above area S ₁ ,
Both oil chambers 7a, 7 at the dump action position as described above.
b are both connected to the hydraulic pump 13, the oil in the contraction oil chamber 7b flows through the circuit 17, the control valve 11, and the circuit 16 to the expansion oil chamber 7a due to the pressure receiving area difference _S1 - _S0 . This is designed so that the tilt cylinder 7 can perform a quick dumping operation. In addition, in the illustrated valve device 9, each control valve 10, 11 has one pump port P ₁ , P ₂ and an outlet port A ₁ ,
A ₂ is additionally provided, and the first control valve 10 is placed in the neutral position N or the floating position F, and the second control valve 11 is placed in the neutral position N.
Each of the control valves 10 and 11 is configured so that hydraulic pressure can be taken out to a carry over port 18 provided in the valve device 9 in a state where the oil pressure is off. It is designed so that it can be operated.

The appearance of the valve device 9 described above when viewed from the side is almost as shown in FIG. 3, and this valve device 9 includes a spool 19 of the first control valve 10 and a The spools 20 of the second control valve 11 are arranged parallel to each other, and the spool insertion holes 22, 2 are formed in the valve case 21 of the valve device 9 as shown in FIGS.
3 so as to be slidably displaceable. As shown in FIG. 5, when the spool 19 of the first control valve 10 is pushed in from the neutral position N, it is displaced to the upward action position U, and when pulled out from the neutral position N, it is moved to the downward action position. D, and then to the floating position F, respectively. On the other hand, as shown in FIG. 6, when the spool 20 of the second control valve 11 is pushed in from the neutral position N, it goes into the tilt action position, and when it is pulled out from the neutral position N, it goes into the dump action position. It is assumed that each of them can be displaced. The valve device 9 includes a fourth valve as follows.
An operating assembly 25, which will be described with reference to FIG. 8, is attached.

The operating assembly 25 described above includes a single operating lever 26.
The lower end is attached to the horizontal plate part of the L-shaped support frame plate 27 located on the upper surface of the support frame, which is formed by welding the appropriately bent support frame plates 27 and 28 to each other. It is arranged on the support frame so as to be exposed through the formed hole 27a. The spools 19 and 20 are made to protrude from the inside of the valve case 21 into the support frame formed by support frame plates 27 and 28 by an appropriate length. Support frame plate 2 mentioned above
Two supporting hardware 29, 3 are attached from the inner surface of the horizontal plate part 7.
0, while the spool 1 as shown in FIG.
9 and 20 are vertically welded at appropriate intervals in the direction across.

As shown in FIGS. 4 and 7, a fork metal fitting 32 to which a shaft 31 is welded and fixed is formed in a support hole 29a in a supporting metal fitting 29 in a direction transverse to the spools 19 and 20.
The shaft 31 is rotatably supported through a bush 33 so as to be rotatable around the axis of the shaft 31. A pin support hole 32a is formed in both fork parts of the fork hardware 32, which is arranged such that the fork groove passes through it vertically. A lever holder 34 having a pin insertion hole 34a facing the pin bearing hole 32a is fitted into the fork groove of the fork hardware 32. A pin 35 that is parallel to the spools 19 and 20 is inserted across the pin insertion hole 34a through the bush 36, and then the lever holder 34 is inserted.
is supported by a fork hardware 32 so as to be rotatable around a pin 35. And the operating lever 26 is
Its lower end is inserted into the hole 34b on the upper surface of the lever holder 34, and then fixed to the lever holder 34 by welding. The lever holder 34 has an operating protrusion 3 that protrudes from the fork hardware 32 in the opposite direction to the shaft 31.
An operating protrusion 37 having a spherical tip and a spherical tip is integrally provided. As shown in FIG. 4, the shaft 31 and the actuating projection 37 are positioned on a common axis passing through the center of the pin 35.

As shown in FIGS. 4, 5 and 7, approximately L
A letter-shaped actuating arm 38 is secured and attached by a nut 39 screwed onto the shaft end. A rising portion 38a facing the spool 19 is formed at the end of the horizontal portion of the operating arm 38, which is bent so that the horizontal portion is parallel to the shaft 31. The end of the spool 19 provided with a notch and the rising portion 38a
A pair of connecting arms 40 on both sides are connected at one end to the end of the spool 19 by a pin 41, and at the other end, a pin 42 is connected to the rising portion 38a.
By connecting the two, they are connected in an interlocking manner. As a result, the shaft 31 is rotationally displaced.
When the actuating arm 38 is rotated around 1, the spool 19 is slidably displaced via the connecting arm 40. In order to smoothly displace the spool 19, the small diameter shaft end of the shaft 31 is The shaft insertion hole 38 of the actuating arm 38 through which the
b is formed into an oval shape that is vertically long.

As shown in FIGS. 4, 6, and 8, the supporting hardware 3
0 is formed in the shape of a gate, and this support hardware 30 has a fork hardware 43, which is different from the fork hardware 32, which rotates around a horizontal pin 44 along a direction perpendicular to the spools 19 and 20. They are freely supported. That is, the fork hardware 4 is arranged such that the fork shaft passes through the operating protrusion 37 on the lever holder 34 in the axial direction.
3 is fitted into a slot open at the lower end of the support metal fitting 30 on the opposite side of the fork part, and a pair of pin bearing holes (not shown) formed in the support metal fitting 30 and the fork metal fitting 4 are fitted.
By inserting the horizontal pin 44 across the pin insertion hole 43a formed in the horizontal pin 4
The fork hardware 30 is rotatably supported around 4. The operating protrusion 37 has its spherical tip facing laterally into the fork groove of the fork hardware 43, and when the lever holder 34 and the operating protrusion 37 are rotated around the pin 35, the lever holder 34 and the operating protrusion 37 rotate around the horizontal pin 44. The fork metal fitting 43 is engaged with the fork metal fitting 43 so that rotational displacement of the fork metal fitting 43 at . Also Folk hardware 43
An inverted U-shaped operating hardware 45 is welded and fixed to the lower surface of the spool 20, which has a slightly smaller diameter and has a pair of flat notches on both sides, and which holds the end of the spool 20. It is interlocked to the end of spool 20 by a pin 46 parallel to horizontal pin 44. From the above, when the fork hardware 43 is rotated and displaced around the horizontal pin 44 as described above, the operating hardware 45 is also rotated and displaced around the horizontal pin 44 as a unit, and the spool 20 is slid. In order to smoothly displace the spool 20, a pair of support holes 45a for the pin 46 formed in the operating hardware 45 are oval-shaped and long vertically.

The operation assembly 25 configured as described above is removably attached to the valve case 21 with the fixture 47 with the vertical plate portion of the support frame plate 27 along the end surface of the valve case 21.
It is attached to the valve case 21. Each of the above-mentioned spool insertion holes 2 in the valve case 21
2 and 23 are provided with a sealing material for oil sealing as usual, that is, in the case shown, a sealing material comprising O-rings 48, 49 on the inner surface and rings 50, 51 on the outer surface. However, in particular, the support frame plate 27 presses down the sealing materials 48, 50 and 49, 51 to prevent them from falling off.

Since the illustrated operating device according to this invention is constructed as described above, the operating lever 26 is connected in the direction of the arrow A shown in FIG. 5, that is, the lever holder 34 is connected to the fork hardware 32. When the fork hardware 32 is rotated in a direction parallel to the pin 35, the lever holder 34 pushes the fork hardware 32 around the shaft 31, and at this time the lever holder 34 and the operating protrusion thereon are rotated. 37 is rotationally displaced around the axis of the shaft 31, so the other fork hardware 43 does not displace it. Since the shaft 31 integrated with the fork metal fitting 32 is rotationally displaced by the rotational displacement of the fork metal fitting 32 described above, the spool 19 of the first control valve 10 is connected to the spool 19 of the first control valve 10 via the operating arm 38 and the connecting arm 40 as described above. is subjected to sliding displacement.
When the operating lever 26 is rotated from the neutral position 26 (N) shown in FIG. 5 to the upward action position 26 (U), the spool 19 is pushed into the upward action position U shown in FIG. , and the operating lever 2
6 from the neutral position 26 (N) shown in FIG. 5 to the downward action position 26 (D), the spool 19 is pulled out to the downward action position D shown in FIG. When the spool 19 is further rotated to the floating action position 26 (F) shown in FIG. 5, the spool 19 is pulled out to the floating action position F shown in FIG.

Conversely, when rotating the operating lever 26 in the direction of arrow B shown in FIG.
Since the operating protrusion 37 thereon is rotationally displaced around the pin 35, the fork hardware 32 is not displaced, but the other fork hardware 43 is rotationally displaced around the pin 44 by the operating protrusion 37, By rotating the fork metal fitting 43 in this way, as described above, the spool 2 of the second control valve 11 is moved by the operating metal fitting 45 which rotates together with the fork metal fitting 43.
0 is subjected to sliding displacement. When the operating lever 26 is rotated from the neutral position 26 (N) shown in FIG. 4 to the dump action position 26 ( ), the spool 20 is moved from the neutral position N shown in FIG. 6 to the dump action position. pulled out, and the operating lever 2
6 from the neutral position 26(N) shown in FIG. 4 to the tilting position 26(), the spool 20 is pushed from the neutral position N shown in FIG. 6 to the tilting position.

Since it is possible to operate the operating lever 26 from any position in the direction of the arrow A or in the direction of the arrow B, the operating lever 26 can be operated substantially in an oblique direction from the neutral position N. It is also possible to obtain simultaneous sliding displacement of the spools 19 and 20, and from this, the spools 19 and 20 can be displaced in the same direction or in opposite directions, and the operation shown in FIG. As shown by the lever 26 position, the valves 10, 11 or the spools 12, 20 are in a lowering and dumping position D, a lowering and tilting position D, and a raising and dumping position, in which the operating lever 26 is operated substantially diagonally. U, and the raising and tilting position U can also be set arbitrarily.

As is clear from the above description, the operating device according to this invention is an operating device for a valve device 9 equipped with two mutually parallel spools 19 and 20, and has a single operating lever 26. an operating assembly 25 comprising: an interlocking connection mechanism for transmitting a rotational displacement of the operating lever 26 along a first direction to one spool 19 in a direction that causes the spool 19 to be slidably displaced; and another interlocking connection mechanism for transmitting the rotational displacement of the operating lever 26 along a second direction perpendicular to the second direction to the other spool 20 in a direction that causes the spool 20 to be slidably displaced. The supporting frame plate 27 of the assembly 25 is placed along the end surface of the valve case 21 in the valve device 9, and the sealing materials 48, 49, 50, 51 provided at the ends of the respective spool insertion holes 22, 23 in the valve case 21 are aligned with the supporting frame plate 27 of the assembly 25. It is pressed by the frame plate 27 and attached to the valve device 9, and has the following advantages.

That is, in the conventional case, as shown in FIG. 10, support arms 60 and 61 are protruded from the end surface of the valve case 21 near each spool 19 and 20, and pins 62 and 61 are provided on the support arms 60 and 61, respectively. 63
Separate operating levers 64, 65 rotatably supported around the spools 19, 20 are provided, connected to each spool 19, 20 by pins 66, 67, for operating the two spools 19, 20. The operator needs to hold and operate the two operating levers 64 and 65 with both hands, and for example, when the front loader is moved forward and backward at a slow speed while the bucket cart 5 is being raised, lowered, and rotated. However, according to this invention, two spools 19,
20 can be operated with a single operating lever 26, which facilitates operation, especially when valve operation and other operations are performed concurrently.

In the operating device according to this invention, the operating device that achieves ease of operation as described above is assembled, and the supporting frame plate 2 of the operating assembly 25 is assembled.
7 is attached to the valve device 9 along the end surface of the valve case 21, so it is equipped with two operating levers for sliding displacement of the spool for one spool, as shown in FIG. 10. It can be easily replaced with the operating mechanism and attached to the valve device, and depending on the user's wishes, the user can choose whether to use the operating mechanism as shown in Figure 10 or the operating mechanism based on this invention. This makes it easy to choose.

Furthermore, as shown in Fig. 10, the conventional one
Separate holding plates 68, 69 are provided on the end face of the valve case 21 to press the sealing materials 48, 50 to 49, 50 provided at the ends of each spool insertion hole 22, 23 to prevent them from falling off. On the other hand, in the operating device according to this invention, since the operating assembly 25 is attached to the valve device 9 by pressing the sealing material with the supporting frame plate 27 of the operating assembly 25, the holding plate on the valve device side is 68, 69
This eliminates the need for parts, resulting in material savings.

[Brief explanation of the drawing]

Fig. 1 is a side view of a front loader equipped with an embodiment of this invention, Fig. 2 is a hydraulic circuit diagram showing the valve device and related hydraulic mechanism installed in the front loader, and Fig. 3 is a hydraulic circuit diagram showing the valve device installed in the front loader. A schematic side view of the device and the above embodiment, FIG. 4 is a longitudinal sectional front view of the above embodiment, FIG. 5 is a longitudinal sectional side view of the embodiment, and FIG. 7 and 8 are partially exploded perspective views of one and other essential parts of the same embodiment, FIG. 9 is an explanatory view of the operation of the same embodiment, and FIG. 10 is a vertical cross-sectional side view showing the conventional example. It is a diagram. 9... Valve device, 10... First control valve, 11... Second control valve,
19, 20... Spool, 21... Valve case, 22, 23... Spool insertion hole, 25... Operating assembly, 26... Operating lever, 27, 2
8... Support frame plate, 29, 30... Support hardware, 31...
...shaft, 32 ... fork hardware, 34 ... lever holder, 35 ... pin, 37 ... operating projection, 38
... Operating arm, 38a... Rising part, 40...
Connection arm, 41, 42... Pin, 43... Fork hardware, 44... Horizontal pin, 45... Operating hardware, 46... Pin, 47... Fixture, 48, 49
...O-ring, 50, 51...ring.

Claims (1)

[Scope of utility model registration request] An operating device for a valve device having two spools parallel to each other, the operating assembly having a single operating lever, the operating assembly having a single operating lever, the operating device being adapted to control a rotational displacement of the operating lever along a first direction to one of the operating levers. An interlocking connection mechanism that transmits rotational displacement of the operating lever along a second direction orthogonal to the first direction to the other spool in a direction that causes the spool to be slidably displaced. The operation assembly is equipped with another interlocking connection mechanism for transmitting the transmission, and the support plate of the operation assembly is aligned with the end surface of the valve case in the valve device, and the sealing material provided at the end of each spool insertion hole in the valve case is inserted. An operating device characterized in that it is attached to a valve device and is pressed by the supporting frame plate.