JPH0513810Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a control device for a hydraulic excavator.

BACKGROUND ART Conventionally, the arrangement of operating levers and operating methods of hydraulic excavators (not shown) have often varied depending on the manufacturer, and in particular, the arrangement of control devices for attachments has often differed.

Problems that the invention aims to solve When operating a hydraulic excavator for work, the operator cannot always operate the same pattern of control devices, and if the model or manufacturer is different, the operator may have a completely different arrangement. There may be times when it is necessary to operate a control device that has become obsolete. It is not only very inconvenient and inconvenient for the driver to operate a control device that is different from what he/she is familiar with, but it also reduces work efficiency, and it is difficult for the driver to be able to drive in a state that he/she is familiar with. requires a certain amount of time. Therefore, you can simply change the arrangement of the control levers to the one you are familiar with, but this requires changing the arrangement of parts, which is not easy, and if a driver other than yourself operates the levers, it will be difficult to do so. We need to return it to the array. This requires time and effort, and also causes troublesome problems such as parts replacement.

The present invention addresses the above-mentioned problems and aims to provide a device that allows the arrangement of control devices to be easily changed using a simple method.

Means for Solving the Problems As means for solving the problems of the present invention, the first bell crank 20 and the second bell crank 21 of the rear bell crank are respectively connected to the shaft 2.
2, 31 and the pipes 2 inserted into these respectively
3, 32, and (b) a pair of left and right protrusions 24, 25 facing upward on the outer periphery of the shaft 22, and a pipe 23.
There is a pair of left and right protrusions 2 facing upward on the outer periphery of the
6, 27, and the outer periphery of the shaft 31 has upward protrusions 35, 36, 37, and the outer periphery of the pipe 32 has upward protrusions 38, 3.
9 and 40, respectively, so that a supporter can be attached to the tip of each of the protrusions, and each of the front bell cranks 3, 5, 8, 10 and the first bell crank 20 or the second bell crank The connecting rods and the protrusions can be selectively connected through the supporter without moving the respective mounting positions of the connecting rods 53, 54, 55, and 56 that connect the connecting rods 21 with the connecting rods 53, 54, 55, and 56.

Function A The control device of the present invention includes a pair of left and right operating levers that can be tilted forward, backward, left and right, a pair of left and right front bell cranks connected to each of the operating levers via a pair of rods, and a The first and second valves are connected to a pair of control valves via rods.
In a hydraulic excavator control device comprising a set of rear bell cranks and a connecting rod connecting the front bell crank and the rear bell crank, the first bell crank and the second bell crank of the rear bell crank are respectively connected to a shaft. It is formed of fitted pipes, and each of these shafts and pipes has protrusions protruding from each other, and the connecting rod can be selectively connected to the protrusions via the supporter. By simply changing the coupling position of the supporter between the connecting rod and the protrusion, various combinations of the operating lever and control valve can be changed. As a result, even a driver who is not familiar with the control system of that model can change the arrangement to a desired arrangement that he or she is familiar with.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Reference numeral 1 designates a right-hand operating lever, which is connected to a bell crank 3 through a rod 2, and to a bell crank 5 through a rod 4. Similarly, 6 is a left-hand operating lever, which is connected to a bell crank 8 through a rod 7, and to a bell crank 10 through a rod 9. The operating levers 1 and 6 are for operating forward and backward, left and right,
It is configured so that the rods 4 and 7 are actuated when operated forward and backward, and the rods 2 and 9 are operated when operated left and right. Bell crank 3 is connecting rod 53
The bell crank 5 is connected to the connecting rod 54, the bell crank 8 is connected to the connecting rod 55, and the bell crank 10 is connected to the connecting rod 54.
The bell crank 5 has a lever 61 facing upward and a lever 62 facing downward, and the connecting rod 54 is connected to either lever 61 or 62. Therefore, the direction of movement can be reversed. Similarly, the bell crank 10 has an upwardly directed lever 63 and a downwardly directed lever 64, and a connecting rod 56.
Its operating direction can be reversed in the connected state. 11 is a control valve for bucket operation, 12
13 is a control valve for operating the boom, 14 is a control valve for swinging, and these control valves 11, 12, 1
3 and 14 have rods 15, 16, 17, respectively.
18 are connected. 19 is the rear bell crank, which includes the first bell crank 20 and the second bell crank 2.
1, the first bell crank 20 is connected to the shaft 2.
2 and a relatively short pipe 23 fitted into this, and the shaft 22 has a pair of left and right protrusions 2.
Similarly, the pipe 23 also has a pair of left and right protrusions 26, 27 protruding upward, and these protrusions 24, 25,
26 and 27 are each provided with a screw hole 28 at the upper end. A lever 29 is provided on the right side of the shaft 22, that is, at a position corresponding to the control valve 11, and projects downward, and a rod 15 leading to the control valve 11 is rotatably supported at the tip of the lever 29. are doing. Similarly, a lever 30 is provided on the right side of the pipe 23, that is, at a position corresponding to the control valve 12, protruding downward, and a rod 16 leading to the control valve 12 is rotatably attached to the tip of the lever 30. It is centrally supported. Second
The bell crank 21 consists of a shaft 31 and a relatively long pipe 32 fitted into the shaft.The pipe 32 has a pair of left and right semicircular notches 33 and 34 cut out at the top. It is set up. The shaft 31 has projections 35, 36, 37 projecting upward on the left side and at positions corresponding to the notch holes 33, 34 of the pipe 32. Similarly, the pipe 32 also has protrusions 38 directed upward on both the left and right sides, and on the right side of the notch hole 34 at the middle part.
39 and 40 are installed protrudingly. These protrusions 35,
36, 37, 38, 39, and 40 each have a screw hole 28 screwed into the upper end thereof. A semicircular notch hole 42 is bored at a position corresponding to the control valve 13 on the lower side of the pipe 32, and the shaft 31
A lever 43 is protruded downward through the notch hole 42 on the lower side of the lever 43, and a rod 17 communicating with the control valve 13 is rotatably supported at the tip of the lever 43. Similarly, a lever 44 is provided on the left side of the pipe 32, that is, at a position corresponding to the control valve 14, protruding downward, and a rod 18 leading to the control valve 14 is rotatably supported at the tip of the lever 44. are doing. 45,
46, 47, and 48 are all supports, and the supporter 45 is composed of a plate 49 and a rod end 50 protruding from the plate.
It is tied to the upper end of the rod end 50
is rotatably supported on a connecting rod 53 by a screw 52. Similarly, the supporter 46 connects the protrusion 26 and the connecting rod 54, the supporter 47 connects the protrusion 37 and the connecting rod 55, and the supporter 48 connects the protrusion 40 and the connecting rod 56. are connected. Note that the protrusion 24 and the protrusion 38
are lined up in the same relative position with respect to the connecting rod 53, and a hole 57 is provided at the rear of the connecting rod 53 at a position corresponding to the protrusion 38, and the supporter 45 moves rearward to close the portion between the protrusion 38 and the hole 57. So pipe 3
2 and a connecting rod 53 can be connected. Similarly, the projections 26 and 36 are aligned with the connecting rod 54, the connecting rod 54 has a hole 58 at a position corresponding to the projection 36, and the supporter 46 is moved rearward to align the projection 36 and the hole 58. Shaft 3 in part
1 and a connecting rod 54 can be connected. The protrusion 27 and the protrusion 37 are also aligned with the connecting rod 55, and the connecting rod 55 has a hole 5 at a position corresponding to the protrusion 27.
9, and the supporter 47 moves forward to support the protrusion 2.
Connect the pipe 23 and the connecting rod 55 at the holes 59 and 7.
can be concatenated. At the same time, the protrusion 39 also changes to the protrusion 37.
Since the supporter 47 is located at a symmetrical position with the protrusion 39 and the connecting rod 55 in between, the supporter 47 can also be moved to connect the protrusion 39 and the connecting rod 55. Protrusion 25 and protrusion 4
The same applies to the case of No. 0, which has a hole 60 at a position corresponding to the protrusion 25 of the connecting rod 56, and the supporter 48 moves forward to connect the shaft 22 and the connecting rod 56 at the protrusion 25 and hole 60. Instead, the protrusion 35 connects the protrusion 40 with the connecting rod 56 in between.
Since the supporter 48 is in the symmetrical position, the supporter 48 can also be moved to connect the protrusion 35 and the connecting rod 56.

Although the present invention is constructed as described above, a case in which it actually operates will be explained.

In Figures 1 and 5, the boom is lowered by operating the control lever 1 forward, the bucket is operated by dumping by operating the control lever 1 to the right, and the arm is lowered by operating the control lever 6 forward. operate the dump truck,
When operating to the right to perform a rightward turning operation, the supporter 45 is coupled to the protrusion 24, that is, the shaft 22, and the supporter 46 is coupled to the protrusion 26.
In other words, it is connected to the pipe 23 and the supporter 4
7 is connected to the projection 37, that is, to the shaft 31, the supporter 48 is connected to the projection 40, that is, to the pipe 32, and the connecting rod 54 is connected to the lever 62 on the lower side of the bell crank 5, A connecting rod 56 connects to a lever 64 on the underside of the bellcrank 10. When the right operating lever 1 is operated forward, the rod 4, connecting rod 54, and rod 16 move in the direction of the arrow. A spool (not shown) of the boom operation control valve 12 is pushed rearward. Since the control valve 12 is preset so that the boom is lowered when the spool is pushed rearward, the boom is lowered by forward operation of the operating lever 1. Next, if you operate the operating lever 1 to the right, the rods 2, connecting rods 53, and rods 15 will be connected.
moves in the direction of the arrow. Since the control valve 11 for operating the bucket is set in advance to operate the dump when the spool is pushed backward, the bucket operates the dump by operating the operating lever 1 in the right direction. When operating the left operating lever 6, for example, when operating it forward,
Rod 7, connecting rod 55, and rod 17 move in the direction of the arrow. Since the arm operation control valve 13 is preset to operate the dump when the spool is pushed backward, the arm operates the dump when the operating lever 6 is operated forward. Next, if you operate the operating lever 6 to the right,
Rod 9, connecting rod 56, and rod 18 move in the direction of the arrow. Since the turning control valve 14 is set in advance to turn to the right when the spool is pushed backward, it turns to the right by operating the operating lever 6 to the right. If operating levers 1 and 6 are operated in the opposite direction, rods 2, 4,
7, 9, connecting rods 53, 54, 55, 56, rods 15, 16, 17, 18, etc., of course move in the opposite direction, so the right operating lever 1
If you operate it backwards, the spool of the boom operation control valve 12 will be pulled forward and the boom will operate as a hoist, and if you operate it to the left, the spool of the bucket operation control valve 11 will be pulled forward and the bucket will operate. Perform excavation operation. If the left operating lever 6 is operated backward, the spool of the arm operation control valve 13 will be pulled forward and the arm will perform the digging operation, and if operated to the left, the spool of the swing control valve 14 will be pulled forward. Turn and turn to the left.

Next, when operation lever 1 is operated, the attachment operation is the same as above, but when operation lever 6 is operated, the rotation and arm operation are swapped, and only the arm operates in the opposite direction. That is, by operating the control lever 1 forward, the boom operates to lower, by operating it to the right, the bucket operates to dump, and by operating the control lever 6 forward, the boom operates to turn to the right. If you want the arm to perform digging by operating it to the right, do the following: Connect the front end of the connecting rod 56 (shown in FIGS. 2 and 6) to the lever 6 on the right side of the bellcrank.
One side of the supporter 47 is connected to the protrusion 39 on the opposite side with the connecting rod 55 in between, and the other side is pivotally supported on the connecting rod 55. One side of the supporter 48 is connected to the protrusion 35 on the opposite side of the connecting rod 56, and the other side is pivotally supported on the connecting rod 56. Since the operating system of the right operating lever 1 has not been changed, it operates in the same manner as described above, but in the left operating system, the mounting position of the front end of the connecting rod 56 has been changed, so the operation is reversed, and The mounting positions of supporters 47 and 48 have changed, and supporter 4
7 is integrated with the protrusion 39, the pipe 32, and the lever 44, and the supporter 48 is integrated with the protrusion 35, the shaft 31,
It is integrated with the lever 43, and the connecting rod 55 and the rod 18 are interlocked, and the connecting rod 56 and the rod 17 are interlocked, so that when the operation lever 6 is operated forward, the rod 7, the connecting rod 55, and the rod 1 are connected.
8 moves in the direction of the arrow, turning control valve 1
Spool 4 is pushed backwards and rotates to the right. When the operating lever 6 is operated to the right, the rod 9, connecting rod 56, rod 18, etc. move in the direction of the arrow, the spool of the arm operating control valve 13 is pulled forward, and the arm performs the digging operation.

Next, operate the operating lever 1 forward to cause the arm to perform a dumping operation, operate it to the right to operate the right turning operation, and operate the operating lever 6 forward to cause the boom to perform a lowering operation. If you want the bucket to dig to the right, do the following: A supporter 45 (shown in FIGS. 3 and 6) is connected to the projection 38 and pivoted to the connecting rod 53. A supporter 46 is tied to the protrusion 36 and pivoted to the connecting rod 54. Supporter 45
is integrated with the protrusion 38, the pipe 32, and the lever 44, and the supporter 46 is integrated with the protrusion 36, the shaft 3
1. Since it is integrated with the lever 43, the connecting rod 5
3 and rod 18 are interlocked, and connecting rod 54 and rod 17 are interlocked. Therefore, when the operating lever 1 is operated forward, the rod 4, connecting rod 54, and rod 17 move in the direction of the arrow, the spool of the arm operating control valve 13 is pushed rearward, and the arm performs a dumping operation. When operating lever 1 is operated to the right, rod 2, connecting rod 53, and rod 18
moves in the direction of the arrow, and the swing control valve 14
spool is pushed backwards and pivots to the right. In the system of the left operating lever 6, a supporter 47 is tied to the projection 27 and pivoted to the connecting rod 55, and a supporter 48 is tied to the projection 25 and connected to the connecting rod 56.
It is centrally supported. Supporter 47, protrusion 27, pipe 2
3. Since the lever 30 is integrally connected, and the supporter 48, protrusion 25, shaft 22, and lever 29 are also integrally connected, the connecting rod 55 and the rod 16 are connected together.
are interlocked, and the connecting rod 56 and rod 15 are interlocked. Therefore, when the operating lever 6 is operated forward, the rod 7, connecting rod 55, and rod 16 move in the direction of the arrow, and the boom operating control valve 1 is moved.
Spool 2 is pushed backwards and the boom performs a lowering operation. If the operating lever 6 is operated to the right, the rod 9, connecting rod 56, and rod 15 will move in the direction of the arrow, and the control valve 1 for bucket operation will move in the direction of the arrow.
The spool 1 is pulled forward and the bucket performs the digging operation.

Next, from the cases shown in FIGS. 3 and 6 described above, if the operation of the arm is reversed even though the operating direction of the operating lever 1 is the same, that is, operating the operating lever 1 forward. If it is desired that the arm performs the digging operation, only the method of connecting the connecting rod 54 and the bell crank 5 is changed as follows. (as shown in Figures 4 and 7), i.e.
The front end of the connecting rod 54 is pivoted to a lever 61 on the upper side of the bell crank 5. Since the movement of the connecting rod 54 is opposite to the movement of the rod 4 in the same direction, when the operating lever 1 is operated forward, the spool of the arm operating control valve 13 is pulled forward in the opposite direction to the above, and the arm is Performs excavation operation. In addition,
The left and right direction of the operating lever 1, the front and back of the operating lever 6,
The operation in the left and right directions is similar to that shown in FIGS. 3 and 6 described above.

As mentioned above, the present invention has levers on both the upper and lower sides that connect the front bell crank and the connecting rod.
Not only can the movement of the connecting rod be reversed by changing its connecting position, but the rear bell crank is formed by a shaft and a pipe fitted into it, and the protrusions provided on the shaft and pipe and the connecting rod are connected by a supporter, and by changing the connection position of the supporter, the operating arrangement and operating direction of the control valve can be freely selected. This allows the driver to easily change the arrangement of the steering devices to a desired arrangement. Note that FIG. 10 is a chart showing the types of operation patterns that can be selected by changing the arrangement of the control devices.

Effects of the invention In hydraulic excavators equipped with conventional control devices, the arrangement of the control devices differs depending on the manufacturer or model of the hydraulic excavator, and it is difficult to change the arrangement of the control devices. Therefore, when a driver operates an arrangement of control devices with which he or she is not familiar, there is a safety problem due to unfamiliarity, and work efficiency is also reduced. However, in the control device of the present invention, levers are provided on both the upper and lower sides to connect the front bellcrank and the connecting rod, and by changing the connecting position, the movement of the connecting rod can be reversed. The bell crank is formed by a shaft and a pipe fitted into the shaft, and the projections provided on the shaft and the pipe are connected to the connecting rod by a supporter, and by changing the connection position of the supporter, the operating arrangement of the control valve can be adjusted. The direction of operation can be freely selected. As a result, the driver can change the arrangement of the control valves for operating the attachment to the arrangement with which he or she is familiar, regardless of the arrangement of the control valves for operating the attachment. Therefore,
The driver does not have to spend time learning a different arrangement of control devices, which is a great advantage. Further, since it is only necessary to change the connection method between the connecting rod and the bell crank or the supporter, the work is simple and time-saving, no additional parts are required, and there is no increase in cost. Furthermore, since the mounting positions of the parts are determined in advance, there is no chance of getting lost or making a mistake when changing the mounting position. Furthermore, by doubling the number of shafts of the rear bell crank, which conventionally had four shafts, the number of shafts can be reduced to two, which frees up space and is advantageous for the arrangement of other parts.

[Brief explanation of the drawing]

All of the drawings show embodiments of the present invention, and Fig. 1, Fig. 2, Fig. 3, and Fig. 4 are all plan views of the main parts of the invention, Fig. 5, and Fig. 6. , 7th
The figure is a perspective view showing an outline of the front part of the present invention, Figure 8 is a view taken from A-A in Figure 1, and Figure 9 is a view from B in Figure 1.
FIG. 10, which is a view seen from -B, is a chart showing the operation pattern of the operation lever. 1,6...operation lever, 11,~,14...control valve, 19...rear bell crank, 20
...First bell crank, 21...Second bell crank, 22,31...Shaft, 23,32...Pipe, 24,~,27,35,~,40...Protrusion, 28...Threaded hole, 33, 34, 42... Notch hole, 45, ~, 48... Supporter, 53, ~,
56...Connecting rod, 57,~,60...Hole.

Claims (1)

[Scope of utility model registration request] A pair of left and right operating levers that can be tilted forward, backward, left and right, a plurality of front bell cranks connected to each of the operating levers via a pair of rods, and between the front bell cranks and a pair of control valves. two sets of rear bell cranks, first and second, provided at In the hydraulic excavator control device, the first bell crank 20 and the second bell crank 21 of the rear bell crank are connected to a shaft 22, respectively.
31, and pipes 23 and 3 inserted into these, respectively.
2, the shaft 22 has a pair of left and right protrusions 24, 25 facing upward on the outer circumference, and the pipe 23 has a pair of left and right protrusions 26, 27 facing upward on the outer circumference of the pipe 23. The outer periphery of the shaft 31 has projections 35, 36, 37 directed upward, and the pipe 3
There are projections 38, 39, 4 upward on the outer periphery of 2.
0 are provided protrudingly, and a supporter can be attached to the tip of each of the protrusions,
The connecting rods 53, 54, 55, 56 that connect each front bell crank 3, 5, 8, 10 and the first bell crank 20 or the second bell crank 21 can be connected without moving the respective mounting positions. A control device for a hydraulic excavator, characterized in that the and protrusions are configured to be selectively connected via a support.