JPH0732901A - Traveling operation device for construction machine - Google Patents

Abstract

PURPOSE:To dispense with an electronic controller and moreover conduct operation with a comfortable posture by providing a palm rest and right and left finger levers in a control box having a wrist control lever on a side of an operator seat, and providing forward of the operator seat a traveling pedal to be made operative by shifting of the palm rest. CONSTITUTION:A palm rest 16 and right and left finger levers 17, 18 for traveling operation are installed in the rear of a work machine lever 9 in the right side control box 11, and a traveling pedal 19 is installed on the floor surface in front of an operator seat 7. When the palm rest 16 is shifted from a neutral position N to a forward movement position F or a rearward movement position R, the finger levers 17, 18 become independently operative to allow forward movement, rearward movement and turning and to control speed. When the palm rest 16 is at the neutral position N, a circuit 65 of the traveling pedal 19 is cut off and inoperative, and when it is shifted from the neutral position N to the forward or rearward movement position F, R and locked, a limit switch is simultaneously turned on to open an opening/closing valve 64 and the circuit 65 of the traveling pedal 19 is communicated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling operation device for a construction machine such as a hydraulic excavator which has a wide space around a driver's seat and has improved operability.

[0002]

2. Description of the Related Art FIG. 8 shows a hydraulic excavator, which is equipped with track-type lower traveling bodies 1a and 1b on both left and right sides, and is mounted on the upper portions of the left and right lower traveling bodies 1a and 1b so as to be freely rotatable. The upper revolving superstructure 2 is mounted, and the upper revolving superstructure 2 has a machine cab 4 in which a driver's cab 3, an engine, hydraulic equipment, etc. are installed.
A counterweight 5 is mounted, and a working machine 6 including a boom, an arm, a bucket, and the like is mounted on a front part of the hydraulic cylinder so that the working machine 6 can be swung up and down and back and forth. As shown in FIG. As shown in the figure, both sides of the driver's seat 7 are swiveled, and the left and right work implement levers 8 are sconcon levers for operating the work implement
9 are attached to the front upper surfaces of the control boxes 10 and 11, respectively. Conventionally, left and right traveling levers 12, 13 are provided upright in front of the driver's seat 7, and traveling pedals 14, 15 are integrally attached to the left and right traveling levers 12, 13, respectively. 12,
By operating the pedal 13 or the traveling pedals 14 and 15, forward / backward movement and turning are performed, and at the same time, speed control is performed according to the operation amount.

[0003]

However, as described above, the conventional traveling operation device has the traveling lever 1 in front of the driver's seat 7.
Since 2 and 13 are erected, the area around the driver's seat 7 is narrow, which hinders the operator from getting on and off, and there is a problem that it is difficult to see the work when excavating the feet as well as the front view. However, there were also problems such as being leaning forward and getting tired from gripping the traveling levers 12 and 13.

SUMMARY OF THE INVENTION The present invention is intended to provide a traveling operating device for a construction machine, which is capable of improving the above-mentioned various problems and at the same time enabling similar control without using an expensive electronic controller to further improve operability. Is.

[0005]

In order to achieve the above-mentioned object, the present invention provides a traveling system in which an operating valve is provided between a hydraulic pump, a traveling hydraulic motor, and a pipeline connecting the pump and the motor. In a hydraulic circuit, a control box including a palm rest for performing a forward / backward shift operation of the operation valve, and a left / right finger lever for performing a left / right turning operation by an interlocking operation composed of the palm rest and a link mechanism, which includes a work machine recon control lever for a side of a driver's seat. The above-mentioned object is achieved by providing a traveling pedal, which is provided on the floor surface in front of the driver's seat, and which is operable by shifting from the neutral position of the palm rest to the forward-reverse position to control the speed. is there.

As a concrete means of the above-mentioned construction, firstly, a link mechanism which can be interlocked with a palm rest and a finger lever is provided with an elongated hole and a loose spring, and secondly, the operation of a traveling pedal is turned off when the palm rest is neutral, and A detent lock mechanism is installed on the palm rest so that it can be turned on in the forward / reverse position, and an opening / closing valve that is turned on / off by a limit switch that interlocks with a release switch is provided in the pilot circuit. Thirdly, an operation valve by the palm rest and left and right finger levers. Control the first pilot valve (P
A PC valve) is provided, and a second pilot is provided for control by the traveling pedal, and the input pressure to the first pilot valve when the traveling pedal is operated is input through the second pilot valve.

[0007]

The traveling operation device of the present invention is a turning operation by interlocking operation, which is composed of a palm rest which is provided in a console box on the side of the seat and which performs a forward / backward movement of a squirrel lever type, and a link mechanism which is provided with an elongated hole and a loose spring in the palm rest. The left and right finger levers and the running pedal for speed control allow the operator to move forward and backward with one hand and one foot,
In addition to controlling the turning and speed, in the neutral and forward / reverse positions of the palm rest, the detent lock mechanism holds the neutral and front / rear positions unless the release switch is used to release the switch. When the travel pedal is closed and the palm rest is kept neutral by the elongated hole of the link mechanism, the finger lever can freely tilt in the elongated hole to perform forward / backward movement, turning, and speed control.

Then, the release switch is turned on to release the lock, which enables shifting from the neutral position to the forward / rearward travel position. On the other hand, the release of the lock causes the limit switch to be turned on and the open / close valve to be opened so that the traveling pedal can be operated. Become. When this palm wrist is shifted from the neutral position to the forward / backward position and the pin hits the elongated hole and is further shifted, the finger lever is similarly shifted from the neutral position to the forward / backward position by the biasing of the loose spring to run straight forward / backward.
Then, in this straight traveling state, one finger lever is returned to the neutral position for turning, and speed control according to the amount of depression of the traveling pedal becomes possible.

[0009]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows the driver's seat surroundings of a hydraulic excavator equipped with a travel operating device according to the present invention. Left and right working machine levers 8, 9 of sconcon lever type are provided on both sides of the driver's seat 7 in the operator's cab 3, respectively. Is attached to the front upper surfaces of the control boxes 10 and 11 so as to rotate and operate the working machine.

A palm rest 16 and left and right finger levers 17 and 18 for traveling operation as shown in FIG. 2 are attached to the rear portion of the work implement lever 9 of the right control box 11, and the front floor of the driver's seat 7 is attached to the palm rest 16. Traveling pedal 19
Is installed.

FIG. 3 shows a traveling hydraulic circuit of the traveling operating device. In the figure, 20 is a hydraulic pump, 21 and 22 are left and right traveling hydraulic motors, and 23 and 24 are left and right operating provided in a pump discharge conduit 25. It is a valve. The left and right operation valves 23 and 24 are the palm rest 16 and the palm rest 1
Left and right finger levers 17 and 1 linked to 6 by a link mechanism
8 and the travel pedal 19 are operated to adjust the pilot pressure from the pilot pump 26 to the first and second pilot valves 2.
It is controlled by 7, 28 (PPC valve).

FIG. 4 shows an interlocking structure composed of a link mechanism of the palm rest 16 and the left and right finger levers 17 and 18 in the traveling circuit. In the figure, the center of a support shaft 29 to which the lower end of the palm rest 16 is fixed at one end. The boss 32 of the rest lever 31 is pushed by the key 30 into the bolt 3
The rest lever 31 is fixed by 3 so that the palm lever 16 can move integrally with the rest lever 31. Loose spring cylinders 34 and 35 are arranged on both sides of the tip of the rest lever 31.
The tip end of the rest lever 31 is inserted into a bifurcated groove formed with a long hole 37 of a holding member 36 attached to Nos. 4 and 35, and a pin 38 attached to the lever 31 is movable in the long hole 37. It is freely engaged. The loose springs 39 and 40 of the cylinders 34 and 35, which are pin-connected to the rest lever 31, are connected to the rods 41 and 42 and the link 4 respectively.
It is swingably connected to a lever 46 of the first pilot valve 27 by a mounting pin 45 via 3, 44.

Further, left and right finger levers 1 are provided on both sides of a rest lever boss 32 fixed to the center of the support shaft 29.
The bosses 47 and 48 of 7 and 18 are rotatably fitted in the levers 53 and 54 of the first pilot valve 27 via levers 49 and 50 and links 51 and 52, respectively. It is swingably connected.

The interlocking operation of the palm rest 16 having the above-described link mechanism and the left and right finger levers 17 and 18 will be described with reference to FIG. In the following description, the left and right finger levers 17 will be described. When the palm wrist 16 is shifted from the neutral (N) position to the forward (F) position or the backward (R) position, the finger lever 17 moves the stroke (l ₁ ) of the long hole 37 formed in the holding member 36 of the loose spring cylinder 34. The range can be moved independently. The stroke (l ₁ ) of the slot 37 and the stroke (l ₂ ) of the lever 43 connecting the finger lever 17 to the first pilot valve 27 are set to l ₁ = l ₂ , and therefore the palm rest 16 The finger lever 17 can be independently operated regardless of the palm rest 16 in a state in which is neutral (N). Since (mounting load of loose spring)> (operating force at full stroke of pilot valve 27), it is possible to move forward and backward and turn as in the conventional case, and speed control according to the shift amount can be performed. . This traveling speed will be described in detail later because the traveling pedal 19 is not operated when the palm rest 16 is neutral (N).

When the palm rest 16 is shifted from the neutral (N) position in the forward (F) or reverse (R) direction, the wrist lever 31 causes the wrist lever 31 to be in the center neutral (N) of the elongated hole 37 of the holding member 36.
When moving from the position to the end, further shifting and locking with the detent at the forward (F) or reverse (R) position, the finger lever 17 also follows the palm rest 16 and moves to the forward (F) or reverse (R) position. Moving. During this movement, the ratio of the length (a ₁ ) of the rest lever 17 to the length (a ₂ ) of the pilot valve side lever 53 of this lever 17 is set to 2: 1, so it is delayed from the shift of the palm rest 16. First, the palm rest 16 shifts to shift the output pressure of the first pilot valve 27 to the forward / backward direction by operating the operating valve, and the finger lever 17 moves to the forward / backward position with a slight delay to move forward / backward. It is like this. Then, in this straight traveling state, when one finger lever 17 is returned to the neutral (N) position by expanding and contracting the loose spring 39, it turns forward and backward while turning, and when released, it moves to the original forward and backward position again and goes straight. To run.

Next, the operation of the traveling pedal 19 will be described. First, as shown in FIGS. 6 and 7, the lock pin 57 of the palm rest 16 is attached to the detent 56 provided on the frame 55.
Is locked at each of the neutral (N), forward (F) and reverse (R) positions, and cannot be shifted unless the lock is released. In order to unlock the lock, a release switch 58 is provided on the knob of the palm rest 16, and the switch 58 is provided as shown in the figure.
By pushing down, the lock pin 57, which has been pushed up through the rod 60 by the biasing force of the spring 59 and engaged with the detent 56, is pulled down to release the engagement with the detent 56. There is.

A limit switch 61, which is turned on and off in conjunction with the release switch 58, is attached to the palm rest mounting frame 55.
Is in the neutral position (N), it is turned off, and as shown in the circuit diagram of FIG. 3, the solenoid on-off valve 64 provided in the pilot circuit 63 via the signal circuit 62 is closed, and the circuit 65 of the traveling pedal 19 is cut off and does not operate. It is like this. Then, move the palm rest 16 forward and backward (F, R) from the neutral (N) position.
At the same time that the limit switch 61 is shifted to the position and locked, the limit switch 61 is turned on to open the opening / closing valve 64 and allow the traveling pedal circuit 65 to communicate. As a result, the input pressure to the first pilot valve 27 is input through the second pilot valve 28, and when the traveling pedal 19 is stepped on during forward / backward traveling, an output corresponding to the stepped amount is output from the second pilot valve 28. The speed is controlled by being input to the pilot valve 27.

In the present embodiment, the hydraulic pressure output by the two pilot valves, the first and second pilot valves, is used. However, an electric lever is used instead of these pilot valves and no electronic controller is provided. In addition, the same traveling operation as in this embodiment is possible. The traveling pedal can be either accelerator or dexel.

[0019]

Since the present invention is configured as described above, the operation of the traveling pedal is cut off when the palm rest is neutral, and the forward and backward movements, turning, and speed control can be freely performed just by operating the left and right finger levers as in the conventional case. At the same time, when the palm rest moves forward and backward, the left and right finger levers follow this and move to the forward and backward positions, allowing straight running, and at the same time turning by returning to the neutral position of one finger lever, and Since speed control is performed according to the amount of depression, it is possible to perform a delicate traveling operation similar to that of an electronic controller without using an expensive electronic controller.

Further, the palm rest and the left and right finger levers are constructed as compact sconcon levers, and the control box is provided on the side of the driver's seat so that they can be operated in a comfortable posture, so that fine control is possible and the front space of the driver's seat is wide. The habitability is improved, and the operator can easily get on and off the vehicle and the visibility is improved.

[Brief description of drawings]

FIG. 1 is a perspective view around a driver's seat provided with a traveling operation device according to the present invention.

FIG. 2 is an enlarged perspective view of a P part in FIG.

FIG. 3 is a traveling hydraulic circuit diagram showing an embodiment of the present invention.

FIG. 4 is a perspective view showing a link interlocking mechanism of the palm wrist and the left and right finger levers.

FIG. 5 is an explanatory view of the same operation.

FIG. 6 is a sectional view of a palm rest.

FIG. 7 is a front view of the same.

FIG. 8 is a schematic side view of a hydraulic excavator.

FIG. 9 is a side view of the vicinity of a driver's seat provided with a conventional traveling operation device.

[Explanation of symbols]

 16 Palm rest 17, 18 Left and right finger levers 19 Travel pedals 21, 22 Left and right traveling hydraulic motors 23, 24 Left and right traveling operation valves 27 First pilot valve (PPC valve 28 Second pilot valve (PPC valve 31 Rest lever 34, 35 Loose Spring cylinder 36 Holding member 37 Slot 38 Pin 39, 40 Loose spring 46, 53, 54 First pilot valve lever 56 Detent 57 Lock pin 58 Release switch 61 Limit switch 64 Open / close valve

Claims (4)

[Claims] 1. A hydraulic pump and a left and right traveling hydraulic motor,
In a traveling hydraulic circuit in which an operating valve is provided between pipes connecting these pumps and motors, a palm rest for performing forward / backward shift operation of the operating valve, and a left / right turn by a linked operation of the palm rest and a link mechanism. The left and right finger levers for operation are installed in the control box equipped with the squirrel control lever for the working machine on the side of the driver's seat, and the travel pedal that is operable by shifting from the neutral position of the palm rest to the forward and backward positions and controls the speed is provided. A traveling operation device for construction machinery, which is provided on the floor in front of the driver's seat. 2. A link mechanism in which the palm rest and the left and right finger levers can be linked is provided with an elongated hole and a loose spring, and in the neutral position of the palm rest, the elongated lever allows the finger lever to freely move forward and backward, rotate, and control the speed. In the forward / backward movement position, the finger lever tilts to the forward / backward movement position by following the palm rest by the loose spring to move forward / backward, and at the same time, returns to the neutral position of one finger lever to turn. The traveling operation device for a construction machine according to claim 1, characterized in that speed control is possible by the traveling pedal. 3. The ON / OFF operation of the traveling pedal is performed by opening / closing a switching valve provided in a pilot circuit by a limit switch interlocking with a release switch of a detent lock mechanism provided at a palm rest portion. The traveling operating device for the construction machine according to claim 1. 4. The control of the operation valve by the palm rest and the left and right finger levers is controlled by a first pilot valve (PPC).
Valve) and the input pressure to the first pilot valve is input through the second pilot valve (PPC valve) provided in the traveling pedal when the traveling pedal is operated. Operating equipment for construction machinery in Japan.