JPH0315641Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a control device for a hydraulic excavator that can change the operation pattern as necessary.

<Prior Art> A control device for a hydraulic excavator is composed of a pair of operating levers, a control valve having a plurality of operating sections, and a transmission mechanism for transmitting the movement of the pair of operating levers to a required section of the control valve. has been done. Each of the pair of operating levers is mounted so as to be tiltable in a first direction and a second direction (front-rear direction and left-right direction) that are perpendicular to each other. The transmission mechanism includes mechanical coupling members such as coupling rods and bell cranks.

On the other hand, the operation pattern of the hydraulic excavator by the pair of operating levers (that is, the actual movement pattern of the hydraulic excavator in response to the tilting operation of the pair of operating levers) is as follows.
They are not necessarily standardized and often differ from manufacturer to manufacturer. However, when an operator who is accustomed to a particular operating pattern has to operate using a different operating pattern, work efficiency decreases due to the so-called difference in operating feel, and there is also a risk of erroneous operation.

Therefore, for example, Japanese Unexamined Patent Publication No. 55-13311 or Japanese Utility Model Application No. 55-123071 discloses a structure in which the connection between a pair of operating levers and a control valve can be changed as appropriate. It has been proposed to allow the user to change the operation pattern as necessary.

<Problems with the Prior Art> Therefore, in a conventional control device configured such that the operation pattern by a pair of control levers can be changed, in order to change the operation pattern, it is necessary to change the connection style by the connection rod, and to change the operation pattern. It is necessary to perform operations such as changing the mounting position and mounting direction of members such as the bell crank, and changing the operation pattern is complicated and takes a considerable amount of time.

<Problem of the invention> The present invention was made in view of the above facts, and its main technical problem is to be able to change the operation pattern of a pair of operation levers sufficiently easily and quickly as necessary. The purpose of this project is to improve the control device of a hydraulic excavator.

<Solution Means of the Invention> The gist of the solution of the present invention for achieving the above technical problem is as follows: (a) The mechanical coupling mechanism between the pair of operating levers and the actuating section of the control valve is A first bell crank mechanism that includes a bell crank, a second bell crank mechanism that also includes four bell cranks, and a second bell crank mechanism for each of the four bell cranks in the first bell crank mechanism.
(b) four connecting rods for connecting to each of the four bell cranks in the first bell crank mechanism; Two connecting portions are provided, and two connecting portions are also provided at a predetermined interval on each of the four bell cranks in the second bell crank mechanism in correspondence with the connecting portions. c) Connect each of the four connecting rods to either one of the two connections of each of the four bellcranks in the first bellcrank mechanism and to the second bellcrank mechanism depending on the desired operating pattern. The object of the present invention is to enable selective connection between each of the four bell cranks and either one of the two connecting portions.

That is, according to the present invention, the first direction and the first
a pair of operating levers mounted so as to be tiltable in both a second direction perpendicular to the direction of the arrow; and a pair of first bells for transmitting the tilting movement of each of the pair of operating levers in the first direction. a first bell crank mechanism comprising a crank and a pair of second bell cranks for transmitting tilting movements of each of the pair of operating levers in the second direction; and a first bell crank mechanism each connected to a required section of the control valve. a second bell crank mechanism consisting of four bell cranks, each of the pair of first bell cranks and the pair of second bell cranks in the first bell crank mechanism being respectively connected to the second bell crank; four connecting rods for connecting to each of the four bell cranks in the mechanism, the pair of first bell cranks and the pair of second bells of the first bell crank mechanism; Each of the cranks is provided with two connecting portions at a predetermined interval, and corresponding to the connecting portions, each of the four bell cranks of the second bell crank mechanism is also provided with a predetermined distance. 2 at intervals
Each of the four connecting rods connects the pair of first bell cranks and the pair of second bell cranks in the first bell crank mechanism according to a desired operation pattern. one of the two connecting portions of each of the bell cranks, and the two connecting portions of each of the four bell cranks of the second bell crank mechanism.
A hydraulic excavator control device is provided, which is characterized in that it is selectively connected to any one of two connecting portions.

<Operation of the invention> According to the hydraulic excavator control device of the invention, simply changing the connection style between the bell crank in the first bell crank mechanism and the bell crank in the second bell crank mechanism by the connecting rod, The operation pattern can be changed. Changing the connection mode by means of the connection rod is sufficiently easy and possible by selecting the other of the two connections arranged on each of the bellcranks in place of the one previously used. It can be carried out quickly.

<Embodiments> Hereinafter, preferred embodiments of a hydraulic excavator control device constructed according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, the illustrated operating device applied to a hydraulic excavator includes a pair of operating levers 1 and 2 and a first bell crank mechanism that transmits the movement of these operating levers 1 and 2. The operating levers 1 and 2 have a cross joint structure and are mounted so as to be tiltable in the front-rear direction (first direction) and the left-right direction (second direction substantially perpendicular to the first direction). The first bell crank mechanism includes a first bell crank 7 that transmits the tilting movement of the operating levers 1 and 2 in the front and back direction.
and 9 have second bell cranks 6 and 8 that transmit the left and right tilting movements of the operating levers 1 and 2. Both ends of the first bell cranks 7 and 9 and the second bell cranks 6 and 8 are rotatably supported via bearings (not shown), respectively. The first bell crank 7 and the second bell crank 6 on one side are each connected to an operating lever (left operating lever) via a rod 3, and when the operating lever 1 is tilted in the front-rear direction, the tilting is only in one direction. When the operating lever 1 is tilted in the left-right direction, the tilting movement is transmitted to the second bell crank 6 via the other rod 3. In addition, the other first bell crank 9 and second bell crank 8
are each connected to the other operating lever 2 via a rod 3, and when the operating lever 2 (right operating lever) is tilted in the front-rear direction, this tilting movement is transmitted to the first bell crank 9 via the rod 3. Further, when the operating lever 2 is tilted in the left-right direction, the tilting movement is transmitted to the second bell crank 8 via the rod 3.

The control device further includes a second bell crank mechanism. The second bell crank mechanism includes four bell cranks 10 and 1 arranged corresponding to the first bell cranks 7 and 9 and the second bell crank mechanisms 8 and 10 in the first bell crank mechanism.
1, 12, and 13, and both ends of these bell cranks 10, 11, 12, and 13 are also rotatably supported via bearings (not shown).
This second bell crank mechanism is connected as required to a pair of control valves 18 and 19 for controlling various actuators in the hydraulic excavator. In the specific example, bell crank 1
0 is connected to the bucket section 18a of one control valve 18 via the rod 5. The bell crank 11 is connected to the pivot section 19b of the other control valve 19 via the rod 5.
is connected to. The bell crank 12 connects control valves 18 and 19 via a pair of rods 4.
arm sections 18c and 19c. The bell crank 13 is also connected to boom sections 18b and 19a of control valves 18 and 19 via a pair of rods 4.

Next, with reference to FIG. 1 and FIG. 2, the connection between the first bell crank mechanism and the second bell crank mechanism will be described. In a specific example, the first bellcrank 6 is provided with a pair of spaced apart plate pieces c and d, the second bellcrank 6 is provided with a pair of spaced apart plate pieces a and b, and The other first bellcrank 9 is provided with a pair of plate pieces g and h spaced apart from each other, and further has a second plate piece g and h.
The bell crank 8 has a plate piece e at intervals.
and f are provided, and these plate pieces a to e constitute a connecting portion. In the second bellcrank mechanism, the bellcrank 10 has a plate piece i corresponding to the plate piece a of the second bellcrank 6 and the plate piece f of the second bellcrank 8, respectively.
and j, and the bell crank 11 is provided with plate pieces l and k corresponding to the plate piece d of the first bell crank 7 and the plate piece e of the second bell crank 8, respectively. The bell crank 12 is provided with plate pieces m and n corresponding to plate piece b of the bell crank 6 and plate piece h of the first bell crank 9, respectively, and further plate pieces c and n of the first bell crank 7 are provided. The bell crank 13 is provided with plate pieces o and p corresponding to the plate pieces g of the bell crank 9 of 1, respectively,
These plate pieces i to p constitute a connecting portion.

By connecting the first bell crank mechanism and the second bell crank mechanism as shown in FIG.
An operation pattern as shown in FIG. 5 is obtained. Specifically, the plate piece c of one first bell crank and the plate piece p of the bell crank 13 are connected by a connecting rod 17, and the second bell crank 6 of one side is connected with the plate piece c of the first bell crank 13.
The plate piece a of the bell crank 10 and the plate piece i of the bell crank 10 are connected by a connecting rod 14. Further, the plate piece h of the other first bell crank 9 and the plate piece m of the bell crank 12 are connected by a connecting rod 14, and the plate piece e of the other second bell crank 8 is connected.
and the plate piece k of the bell crank 11 are connected by a connecting rod 14. When connected in this manner, as can be easily understood from FIG. 2, when one of the operating levers 1 (left operating lever) is tilted in the front-rear direction, this tilting causes the rod 3, the first bell crank 7, the connecting rod 17, Bell crank 13 and a pair of rods 4
is transmitted to the boom sections 18b and 19a of the control valves 18 and 19, thereby displacing these spools, so that by tilting the operating lever 1 back and forth, the boom can be operated as desired. Furthermore, when the operating lever 1 is tilted in the left-right direction, the tilting is applied to the rod 3, the second bell crank 6, and the connecting rod 1.
4. Bucket section 18a of control valve 18 via bell crank 10 and rod 5
is transmitted to the bucket section 18.
The spool of a is moved, thus operating lever 1
By tilting from side to side, the bucket can be operated as desired. On the other hand, the other operating lever 2
When you tilt the (right control lever) in the front and back direction,
This tilting causes the rod 3, the first bell crank 9,
Control valves 18 and 19 are connected via connecting rod 14, bell crank 12 and a pair of rods 4.
arm sections 18c and 19c of the arm section 18c and 19c.
spool c is moved, thus operating lever 2
The arm can be operated as desired by tilting back and forth. Furthermore, when the operating lever 2 is tilted in the left-right direction, the tilting movement is transmitted to the swing section 19b of the control valve 19 via the rod 3, the second bell crank 8, the connecting rod 14, the bell crank 11, and the rod 5. This moves the spool of the swing section 19b, and thus the swing motor can be operated as required by tilting the operating lever 2 in the left and right direction.

Instead of connecting as described above, by connecting the first bell crank mechanism and the second bell crank mechanism as shown in FIG. 3, an operation pattern as shown in FIG. 6 can be obtained ( Therefore, when changing the operation pattern shown in FIG. 5 to the operation pattern shown in FIG. 6, the connection method shown in FIG. 3 may be used instead of the connection method shown in FIG. 2. , a rod 1 connects the plate piece d of one of the first bell cranks and the plate piece l of the bell crank 11.
5, and the plate piece b of the second bell crank 6 on one side and the plate piece n of the bell crank 12 are connected by a connecting rod 16. Also, the plate piece g of the other first bell crank 9 and the bell crank 13
The plate pieces o of the second bell crank 8 are connected by a connecting rod 14, and the plate piece f of the other second bell crank 8 and the plate piece j of the bell crank 10 are connected by a connecting rod 14. When connected, as can be easily understood from FIG. 3, when one operating lever 1 (left operating lever) is tilted in the front-rear direction, this tilting causes the rod 3, the first bell crank 7, and the connecting rod 1 to tilt.
5. Boom section 1 of control valve 19 via bell crank 11 and a pair of rods 5
9b, thereby moving the spool of section 19b, and thus the swing motor can be operated as required by tilting the operating lever 1 in the longitudinal direction. Furthermore, when the operating lever 1 is tilted in the left-right direction, the tilting is applied to the arm section 18c of the control valves 18 and 19 via the rod 3, the second bell crank 6, the connecting rod 16, the bell crank 12, and the pair of rods 4. and 19c, thereby moving the arm section 18c and the spool, so that the arm can be operated as required by tilting the operating lever 1 in the left and right direction. On the other hand, when the other operating lever 2 (right operating lever) is tilted in the front-rear direction, this tilting is applied to the control valve via the rod 3, the first bell crank 9, the connecting rod 14, the bell crank 13, and the pair of rods 4. 18 and 19, the spools of these sections 18b and 19a are thereby moved, and thus the boom can be operated as desired by tilting the control lever 2 back and forth. Furthermore, when the operating lever 2 is tilted in the left-right direction, the tilting movement is transmitted to the bucket section 18a of the control valve 18 via the rod 3, the second bell crank 8, the connecting rod 14, the bell crank 10, and the rod 5. As a result, the spool of the bucket section 18a is moved, and the bucket can thus be operated as desired by tilting the operating lever 2 in the left and right direction.

The connecting rods 14 and 17 in the connection mode of FIG. 2 are advantageously constructed as shown in FIG. The connecting rod 14 is composed of a first rod body A and a ball joint 20 screwed onto both ends of the first rod body A, and the ball joint 20 is fixed by a nut 21. This connecting rod 14 is set to a length l. Further, the connecting rod 17 is connected to the second rod body B.
(shorter than the first rod body A), and an adjustment rod C screwed onto one end of the second rod body B.
and a ball joint 20 screwed onto the other end of the second rod body B and one end of the adjustment rod C, and the adjustment rod C and the ball joint 20 are fixed by a nut 21. This connecting rod 17 is also set to a length l.

When changing from the connection style shown in Figure 2 to the connection style shown in Figure 3, as can be easily understood by comparing Figures 2 and 3, the first bell crank and Since the spacing between the bell cranks 11 is shorter than l, it is necessary to use a connecting rod 15 in place of the connecting rod 17. Also, since the distance between the second bell crank 6 and the bell crank 12 is longer than l, the connecting rod 1 is used instead of the connecting rod 14.
It is necessary to use 6. Referring to FIG. 4, the connecting rod 15 includes a second rod body B and a ball joint 2 screwed onto both ends of the second rod body B.
0, and is substantially the same as the connecting rod 17 with the adjustment rod C removed, and its length is l-l'. The connecting rod 16 also includes a first rod main body A, an adjustment rod C screwed onto one end of the first rod main body A, and a first rod main body A.
It consists of a ball joint 20 screwed to the other end and one end of the adjustment rod C, and the first rod body A of the connecting rod 14 and the ball joint 2
This is substantially the same as the adjustment rod C installed between 0 and 0, and its length is l+l'.

In the specific example, the length of the connecting rod connecting the first bell crank mechanism and the second bell crank mechanism is adjustable, and therefore the operation pattern shown in FIG. 5 is changed to the operation pattern shown in FIG. 6. In this case, it is sufficient to remove the adjustment rod C from the connection rod 17 and attach this adjustment rod C to one of the remaining three connection rods 14.On the other hand, the operation pattern shown in FIG. 6 is shown in FIG. When changing the operation pattern, the adjustment rod C can be removed from the connection rod 16 and the adjustment rod C can be attached to the connection rod 15.

As described above, when changing the operation pattern in a specific example, it is only necessary to change the connecting position of the connecting rod, and it can be accomplished much more easily and in a shorter time than in the past, and it also requires no additional parts. etc. are not required at all. Also, due to the change in the connecting position of the connecting rod, the first bell crank mechanism and the second
When the spacing of the bell crank mechanism changes, the length of the connecting rod can be adjusted, which is extremely easy to operate.

In addition, if the length of the connecting rod is not adjustable, it is necessary to replace the connecting rod with one of the specified length, but even in such a case, it is only necessary to replace the connecting rod, which is faster than before. It is possible to change the operation pattern even with a small number of parts replacements.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a main part of a specific example of a control device according to the present invention. FIG. 2 is a perspective view showing a state in which the first bell crank mechanism and the second bell crank mechanism are connected in a first manner in the operating device of FIG. 1; Figure 3 shows the first
FIG. 3 is a perspective view showing a state in which the bell crank mechanism and the second bell crank mechanism are connected in a second manner. 4 is a diagram showing various connecting rods used in the control device of FIG. 1; FIG. FIG. 5 is a diagram showing an operation pattern when connected in the first manner shown in FIG. 2. 6th
The figure is a diagram showing an operation pattern when connected in the second manner shown in FIG. 3. 1 and 2...operation lever, 3, 4 and 5...rod, 6 and 8...second bell crank, 7 and 9
...First bell crank, 10, 11, 12 and 13...Bell crank, 14, 15, 16 and 1
7... Connection rod, 18 and 19... Control valve, a to p... Plate piece.

Claims (1)

[Claims for Utility Model Registration] A pair of operating levers mounted so as to be tiltable in both a first direction and a second direction perpendicular to the first direction; a pair of first bell cranks for transmitting a tilting motion in a first direction; and a pair of second bell cranks for transmitting a tilting motion of each of the pair of operating levers in the second direction. a second bell crank mechanism consisting of four bell cranks each connected to a required section of the control valve; the pair of first bell cranks in the first bell crank mechanism; four connecting rods for connecting each of the pair of second bell cranks to each of the four bell cranks in the second bell crank mechanism, the first bell crank mechanism; In each of the pair of first bell cranks and the pair of second bell cranks, two connecting portions are arranged at a predetermined interval, and the second connecting portions are arranged in correspondence with the connecting portions. Each of the four bell cranks in the bell crank mechanism also has two bell cranks at a predetermined interval.
Each of the four connecting rods connects the pair of first bell cranks and the pair of second bell cranks in the first bell crank mechanism according to a desired operation pattern. one of the two connecting portions of each of the bell cranks, and the two connecting portions of each of the four bell cranks of the second bell crank mechanism.
1. A control device for a hydraulic excavator, characterized in that the control device is selectively connected to one of two connecting portions.