JP2002348917A - Operating lever of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine having a dozer lever rockingly operated and an engine control lever operated to rock to control the rotational frequency of an engine in which both levers are disposed in a compact state in a place easy to operate. SOLUTION: The base end parts of the dozer lever 16 and the engine control lever 17 are supported on a shaft 20 projected from a seat support 20 in the state of pointing in the lateral direction through first and second rocking plates 21, 22 to freely rock forward and backward, and the forward end parts sides of the dozer lever and the engine control lever are substantially in a line in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of operating levers for construction machines such as hydraulic excavators.

[0002]

2. Description of the Related Art Generally, various operating tools and operating devices such as an operating lever, an operating pedal, an operating panel, and a monitor are arranged in a driver's seat portion of a construction machine. In addition to the usual traveling lever and left and right working levers (lever for operating the swivel, boom, arm, and bucket), a dozer lever for operating a dozer (blade) and an engine for adjusting the engine speed A control lever (accelerator lever, governor lever) or the like may be provided.

[0003]

In recent years, there has been an increasing demand for small construction machines such as, for example, miniature shovels of the ultra-small-turn type. Because of the small space, the layout of the various operation levers described above is troublesome. In this case, the traveling lever and the left and right working levers are the ones that are used most frequently, and the installation space is given priority. However, the dozer lever and the engine control lever must be postponed. When the size of the seat is increased in order to improve the operability, it is difficult to secure a space for disposing these levers, and there is a problem that the lever may be provided in a place where it is difficult to operate, and the present invention solves this problem. There was a challenge to try.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made with the object of solving these problems, and comprises a dozer lever which is pivotally operated to operate a dozer. In a construction machine having an engine control lever which is swingably operated to adjust the engine speed, a swing support shaft of the dozer lever and a swing support shaft of a governor lever are coaxial. By doing so, the pivot shafts of the dozer lever and the engine control lever can be shared, so that the number of members can be reduced and space can be saved. In this case, the pivot shafts of the dozer lever and the engine control lever are arranged on one of the left and right sides of the seat portion on which the operator sits, so that both levers can be arranged at a position where both levers can be easily operated. In addition, the base end sides of the dozer lever and the engine control lever are supported by a swing support shaft that is oriented in the left-right direction to be able to swing back and forth,
By arranging the dozer lever and the front end of the engine control lever so that they are substantially aligned in the front-back direction, a space for one lever is sufficient in the left-right direction, and the most in the front-back direction as long as they do not interfere with each other Since the two levers can be brought close to each other, both levers can be arranged in a compact state, and space saving can be promoted.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a mini-excavator, which is a crawler-type lower traveling body 2, an upper revolving body 3 rotatably supported by the lower traveling body 2, and a gantry frame for the upper revolving body 3. Working part 4 and lower traveling body 2 supported to be able to swing left and right and up and down
Is provided with a dozer (blade) 5 and the like, which are attached to the gantry frame so as to be vertically swingable.

Reference numeral 6 denotes a driver seat provided on the upper revolving superstructure 3. The driver seat 6 includes left and right console boxes 8L and 8 on both left and right sides of a seat 7 on which an operator sits.
R is arranged, but this console box 8 on the left and right
Left and right work levers 9L and 9R are attached to L and 8R as operation levers for turning the upper swing body 3 and performing work by the front work unit 4, and also include a monitor panel 10 and various operation switches 11 and the like. Is arranged. Further, in front of the seat 7, left and right traveling levers 12L,
12R, operation pedals 13, 14 and the like are provided.

A tank cover 15 covers a fuel tank and a hydraulic oil tank (both not shown) disposed to the right of the driver's seat 7. A space is secured between the right console box 8R and a dozer lever 16 and an engine control lever (accelerator lever, governor lever) 17 are disposed in the space as described later.

On the other hand, reference numeral 18 denotes a seat support serving as a frame for the seat 7, and a flat mounting bracket 19 is fixed to the right side of the seat support 18. A base end of a shaft 20 facing in the left-right direction is fixed to the mounting bracket 19, and a first swing plate to which a base end of the dozer lever 16 is integrally fixed is attached to the shaft 20. 21 and a second swing plate 22 to which the base end of the engine control lever 17 is integrally fastened are rotatably supported.

That is, although the first swing plate 21 has a substantially triangular shape, a cylindrical bearing portion 21a is integrally formed at the center of the first swing plate 21. The bearing 21a is formed of a pair of right and left bushes 2.
3, the shaft 20 is externally fitted to the base-side half of the shaft 20 in a state where the movement in the left-right direction is regulated and the shaft 20 is rotatable around the axis. The first oscillating plate 21 is configured to oscillate around the shaft 20 in the direction around the axis. The oscillating range of the first oscillating plate 21 is Are set in a range where they come into contact with the stoppers 24 and 24a and are restricted from swinging.

On the other hand, the base end of the dozer lever 16 is integrally fixed to the upper apex of the three apexes of the first swinging plate 21.
Is temporarily extended rightward from a fastening portion with the first swinging plate 21 and then bent upward with a slight incline toward the front so that the driver's seat side surface of the tank cover 15 and the right console box are bent. 9R, projecting above the upper surface of the console box through the space between the console box 9R and the handle 16 which the operator grips.
a is attached. Thus, the dozer lever 16
When the operator grips the handle 16a and swings in the front-back direction, the operator swings in the front-back direction with the shaft 20 as a swing support shaft. In this case, the swing operation range of the dozer lever 16 is limited to the first swing plate 21.
The swing operation range of the dozer lever 16 is set to be on the front side of the shaft 20.

One end of an inner wire 25 a constituting the first cable 25 is connected to a rear vertex of the remaining vertex of the first swing plate 21. The first cable 25 has an inner wire 25a inserted in a tube of an outer tube 25b fixed to the body side so as to be able to advance and retreat.
The inner wire 25a moves forward and backward in the outer tube 25b by the swing of the first swing plate 21 accompanying the back and forth swing operation.
The other end of 5a is connected to a dozer control valve driving device 26.

The dozer control valve driving device 26 includes:
Although it is incorporated in the gantry frame of the upper rotating body 3,
This is the inner wire 2 of the first cable 25
A dozer control valve (not shown) for controlling the supply and discharge of pressure oil to and from a dozer cylinder (not shown) is actuated based on the forward / backward movement of 5a, whereby the dozer 6 is configured to move up and down. .

On the other hand, the second oscillating plate 22 has a substantially elliptical shape, and a cylindrical bearing portion 22a is integrally formed at the center of the second oscillating plate 22. .
The shaft bearing portion 22a is externally fitted to a portion of the shaft 20 closer to the distal end side than the first swing plate bearing portion 21a so as to be rotatable around the axis. Thus, the second swing plate 22 is configured to swing around the shaft 20 in the direction around the axis. The swing range of the second swing plate 22 is the second swing plate 22. Is stopper 2
7, 27a are set in a range where swinging is restricted. Further, double lock nuts 29, 29 a are fastened via a washer 28 to a portion of the shaft 20 on the distal end side with respect to the second swing plate bearing portion 22 a. By adjusting the fastening force of the lock nut 29 on the side of the second swinging plate bearing portion 22a, an appropriate operation force of the engine control lever 17 described later can be obtained.

A base end of an engine control lever 17 is integrally fixed to a rear end of the second swing plate 22. The engine control lever 17 is provided with a second swing plate. 22 and temporarily bends upward in a state in which the tank cover 15 is inclined slightly rearward to form a space between the driver seat side surface of the tank cover 15 and the right console box 9R. Through the upper part of the console box, and a handle 17 held by an operator
a is attached. The engine control lever 17 is configured to swing in the front-rear direction with the shaft 20 as a swing support shaft by gripping the handle 17a and swinging in the front-rear direction. In this case, the swing operation range of the engine control lever 17 is determined by the swing range of the second swing plate 22, but the swing operation range of the engine control lever 17 is
It is set to be on the rear side from 0.

That is, the dozer lever 16 which swings around the shaft 20 and the engine control lever 17
And are arranged so as to be substantially aligned in the front-back direction,
Thus, the space between the driver's seat side surface of the tank cover 15 and the right console box 9R is sufficient if there is a space for one lever. As described above, the swing operation range of the dozer lever 16 is the shaft. 20
Than the engine control lever 17
Is set so as to be on the rear side of the shaft 20, so that interference between the levers 16 and 17 can be avoided.

Further, one end of an inner wire 30a of the second cable 30 is connected to the front end of the second swing plate 22. The second cable 30 has a structure similar to that of the first cable 25, and an inner wire 30a is movably inserted into a tube of an outer tube 30b fixed to the body side. The inner wire 30a is moved forward and backward in the outer tube 30b by the swing of the second swing plate 22 accompanying the forward and backward swing operation of the engine control lever 17. The end side is connected to a fuel injection device (not shown) and also to a governor lever 31 constituting a governor mechanism. Thus, the engine speed is adjusted based on the forward and backward swing operation of the engine control lever 17. I can do it.

In the apparatus constructed as described above, the base ends of the dozer lever 16 for operating the dozer 6 and the engine control lever 17 for adjusting the engine speed are directed left and right from the seat support 18 side. A shaft 20 protruding in this state is supported by first and second swing plates 21 and 22 so as to be swingable in the front-rear direction. On the other hand, these two levers 16, 17
From the space between the right control box 9R and the tank cover 15,
7a project in a state of being substantially aligned in the front-rear direction.

As a result, the swing support shafts of the dozer lever 16 and the engine control lever 17 can be shared,
The number of members can be reduced, which contributes to cost reduction, and both levers 16 and 17 can be arranged at an easy-to-operate position on the right side of the right control box 9R. Is sufficient for one lever in the left-right direction, and can be made closest to each other in the front-back direction as long as they do not interfere with each other, so that space saving can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view of a mini excavator.

FIG. 2 is a front view of a dozer lever and an engine control lever mounting portion.

FIG. 3 is a side view of a dozer lever and an engine control lever mounting portion.

FIG. 4 is a plan view of a dozer lever and an engine control lever mounting portion.

FIG. 5 is an enlarged sectional view taken along line XX of FIG. 3;

FIG. 6 is an enlarged sectional view taken along line YY of FIG. 3;

FIG. 7 is a perspective view showing a connection state of a first cable.

FIG. 8 is a perspective view showing a connection state of a second cable.

FIG. 9 is a rear view showing a connection state of a second cable.

[Explanation of symbols]

 5 Dozer 7 Seat 16 Dozer lever 16a Handle 17 Engine control lever 17a Handle 20 Shaft

Claims (3)

[Claims] 1. A construction machine comprising: a dozer lever that is oscillated to operate a dozer; and an engine control lever that is oscillated to adjust the engine speed. An operating lever for a construction machine, characterized in that the swing shaft and the swing shaft are coaxial. 2. The operating lever of a construction machine according to claim 1, wherein the swing shafts of the dozer lever and the engine control lever are arranged on one of the left and right sides of a seat portion on which an operator sits. . 3. The dozer lever and the engine control lever according to claim 1 or 2, wherein the base ends of the dozer lever and the engine control lever are supported by a swing support shaft extending in the left-right direction so as to be able to swing back and forth. The operation lever of the construction machine, wherein the part side is arranged substantially in a line in the front-rear direction.