JPH0853859A - Travelling pedal for construction machine - Google Patents

Abstract

PURPOSE:To improve operability in inching by a method wherein a pedal is arranged to the underside of a travelling motor-operating pilot valve installed to an underframe and connected to the valve so that it can be operated in interlocking with the valve while being hinged to the underframe so that it can be swung in the forward and rearward directions. CONSTITUTION:An underframe is installed upright on a floor 2 in front of a driver's seat 1, and a pilot valve 13 is provided to the upper side of the underframe 12. A travelling pedal 14 is hinged to the underframe 12 so that it can be swung in the forward and rearward directions while one end thereof is connected to an operating part of the pilot valve 13. As the pedal is arranged, looking down the surface of the floor from the underside of the pilot valve, and is made operable in one-way operation, being trodden toward the front side, lever ratio becomes larger while longer stroke can be ensured. Further it is easily operable (without any fatigne) with an automobile feeling (without any fatigne) and finely operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling pedal device equipped mainly in construction machines such as hydraulic excavators and work vehicles.

[0002]

2. Description of the Related Art FIG. 8 is a side view of a main portion of a driver's cab equipped with a conventional control device. FIG. 9 is a front view of the main part of the control device viewed from A in FIG. As shown in FIGS. 8 and 9, a pilot valve 3 for operating a traveling motor (not shown) forming a traveling drive device on a floor 2 in front of a driver's seat 1.
Is fixed, and a pair of left and right traveling pedals 4 and 5 are attached to the operation portion above the pilot valve 3. Further, traveling levers 6 and 7 are attached to the traveling pedals 4 and 5, respectively. Further, control boxes 8 and 9 are provided on both left and right sides of the driver's seat 1, and work levers 10 and 11 are attached to the front parts thereof. In this control device, when the left travel pedal 4 or the travel lever 6 is operated forward or backward from the neutral position, the left travel motor starts to rotate accordingly. Further, the operating speed of the traveling pedal 4 and the traveling lever 6 controls the rotational speed of the traveling motor, that is, the traveling speed. Similarly, the right side traveling motor is operated by operating the right side traveling pedal 5 or the traveling lever 7, and the direction and speed thereof are controlled. In other words, the operation
While controlling the operating direction of the traveling pedals 4 and 5 or the traveling levers 6 and 7 and the stroke thereof, the controller can perform forward / backward straight movement, direction change, pivot turn, spin turn and the like.

[0003]

The above-described control device has the following drawbacks. That is, since the traveling pedal is configured to be both front and rear hands and the operation stroke is small, it is difficult to perform fine operation, and particularly operation by the heel is difficult. For this reason, a running lever that is easy to operate is also installed, but the cost is high. In addition, depending on the work contents, the so-called simultaneous operation, such as traveling while moving the work attachment, is quite frequent.In such a case, the simultaneous operation of the work lever and the travel pedal is inevitably required. It is required to improve the sex. The present invention aims to solve the above problems.

[0004]

In order to achieve the above object, in the traveling pedal device of the present invention, an underframe is erected on the floor in front of the driver's seat, and a traveling motor is operated on the upper plate portion of the underframe. A pilot valve for a vehicle was attached, and a pedal was arranged below the pilot valve to connect the pilot valve so as to be interlocked with the pilot valve, and the pedal was pivotally fixed to the underframe so as to be rotatable in the front-rear direction.

Four pilot valves were arranged side by side on the upper plate of the underframe, and pedals were provided corresponding to the respective pilot valves.

Two pilot valves are arranged side by side on the upper plate of the underframe, and pedals are provided corresponding to the respective pilot valves.

A solenoid valve is inserted in a pilot circuit connecting the pilot valve and a control valve for controlling the running motor, and the solenoid valve is operated via a switch.

A bracket having a step with respect to the tread surface is provided on either side of the tread surface of the pedal, and a switch is attached to the bracket.

A pilot lamp was inserted in the circuit connecting the solenoid valve and the switch.

[0010]

In the traveling pedal device of the present invention, the pilot valve is provided on the underframe provided at the front of the driver's seat, and the pedal is provided from the lower portion of the pilot valve toward the floor.
The lever ratio can be increased and the stroke can be lengthened to improve fine operability. In addition, the above-mentioned underframe is provided with pedals for forward and backward movements for left and right running, respectively, and the operation is a one-handed operation, so it is easy to operate and can be operated like a car. Further, the traveling pedal is simplified to two for left and right, a solenoid valve is inserted between the pilot valve and the traveling motor, and the solenoid valve is switched through a switch to switch between forward and reverse. I did it. Further, a pilot lamp is inserted between the switch and the solenoid valve so that the pilot lamp is turned on when the solenoid valve is switched to prevent an erroneous operation between forward and reverse.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view of a main portion of a driver's cab equipped with a traveling pedal device according to claim 1 of the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as those in the prior art. As shown in the figure, an underframe 12 is erected on the floor 2 in front of the driver's seat 1, and a pilot valve 13 is attached to the upper surface of the underframe 12. A traveling pedal 14 is pivotally fixed to the underframe 12 so as to be rotatable in the front-rear direction, and one end of the traveling pedal 14 is connected to an operating portion of the pilot valve 13.

FIG. 2 is a front view of a main portion of the traveling pedal device according to the second aspect of the present invention. As shown in the figure, a gate-shaped underframe 15 is erected on the floor 2, and four pilot valves 16 for left front / reverse and right front / reverse are installed side by side on the upper surface of the underframe 15, and Left forward pedal 1 on the pilot valve 16
7, a left backward pedal 18, a right forward pedal 19, and a right backward pedal 20 are connected to each other. The pedals 17, 18, 19, 20 are pivotally fixed to the underframe 15 via pins 21 so as to be rotatable in the front-rear direction.

FIG. 3 is a front view of the essential portions of the traveling pedal device according to the third aspect of the present invention. As shown in the figure, an underframe 22 is erected on the floor 2, two pilot valves 16 for left and right traveling are installed side by side on the upper surface of the underframe 22, and the left traveling pedal is attached to the pilot valve 16. 23 and the right running pedal 24 are connected to each other.

FIG. 4 is a hydraulic / electrical system diagram of the traveling pedal device according to the fourth aspect of the present invention. As shown in the figure, when the left travel pedal 23 is depressed, the pilot valve 16 operates, and the pressure oil discharged from the auxiliary pump 25 passes through the pipeline 26, the solenoid valve 27, and the pipeline 28. -Enter the valve 29 to activate the valve. Then, the pressure oil discharged from the main pump 30 passes through the pipe 31 and the control valve 29 to enter the left traveling motor 32 for rotation. Further, when the switch 33 is turned on, the solenoid valve 27 is activated, and the pressure oil in the pipeline 26 is transferred to the pipeline 34
Then, the control valve 29 is reversely operated to reversely rotate the left traveling motor 32. In addition, the right running pedal 24
Since the operation of the right traveling system when the engine is operated is the same as that of the left traveling system, description thereof will be omitted.

FIG. 5 is a side view of the essential portions of the traveling pedal of claim 5 of the present invention. FIG. 6 is an enlarged view of a main part viewed from B of FIG. As shown in FIGS. 5 and 6, the traveling pedal 35 is composed of a lever 36 and a plate 37. The plate 37 faces the front side portion of the tread surface 39 and is directed upward with respect to the tread surface 39. A switch mounting portion 38 having a step is formed to mount the switch 33.

FIG. 7 is a hydraulic / electrical system diagram of the traveling pedal device according to the sixth aspect of the present invention. Panel 4 as shown
1 install the pilot lamp 40 and switch 33 to O
When it is set to N, the pilot lamp 40 is turned on, the solenoid valve 27 is operated, the control valve 29 for controlling the left traveling motor 32 is operated in the reverse direction, and the left traveling motor 32 is rotated in the reverse direction. Is reported to the operator. Similarly, when the switch 42 is turned on, the pilot lamp 43 is turned on to inform the operator that the right running motor 44 is rotating in the reverse direction.

[0017]

According to the present invention, the pilot valve is provided on the underframe provided at the front of the driver's seat, the pedal is provided from the lower portion of the pilot valve toward the floor surface, and the pedal is stepped forward to operate. It was unilateral. As a result, the lever ratio can be increased and the stroke can be taken longer, so the fine operability can be improved, and since the driver can feel as if driving a car, workability can be improved and operator fatigue can be reduced. it can. Further, simultaneous operation of work and traveling becomes easy, and work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a main part of a driver's cab equipped with a traveling pedal device according to claim 1 of the present invention.

FIG. 2 is a front view of a main portion of the traveling pedal device according to claim 2 of the present invention.

FIG. 3 is a front view of a main portion of the traveling pedal device according to claim 3 of the present invention.

FIG. 4 is a hydraulic / electrical system diagram of the traveling pedal device according to claim 4 of the present invention.

FIG. 5 is a side view of a main part of the traveling pedal device according to claim 5 of the present invention.

FIG. 6 is an enlarged view of a main part of the traveling pedal viewed from B of FIG.

FIG. 7 is a hydraulic / electrical system diagram of the traveling pedal device according to claim 6 of the present invention.

FIG. 8 is a side view of a main part of a driver's cab equipped with a conventional traveling control device.

9 is a front view of a main part of the control device viewed from A in FIG.

[Explanation of symbols]

1 Driver's seat 2 Floor surface 3,13,16 Pilot valve 4,5,14,17,18,19,20,23,24,
35 Travel pedal 6,7 Travel lever 10,11 Work lever 12,15,22 Underframe 26,28,31,34 Pipeline 27 Solenoid valve 29 Control valve 32 Travel motor 33 Switch 40 Pilot lamp

Claims (6)

[Claims] 1. A construction machine in which a traveling control device is arranged in front of a driver's seat, and an underframe is erected on a floor in front of the driver's seat, and a traveling motor is mounted on an upper plate portion of the underframe. A pilot valve for operation was attached, a pedal was arranged below the pilot valve and linked so as to be interlockable with the pilot valve, and the pedal was pivotally fixed to the underframe so that the pedal could rotate in the front-rear direction. A traveling pedal device for a construction machine, which is characterized in that 2. The construction machine according to claim 1, wherein four pilot valves are arranged side by side on an upper plate portion of the underframe, and pedals are provided corresponding to the respective pilot valves. Travel pedal device. 3. The construction machine according to claim 1, wherein two pilot valves are provided side by side on an upper plate portion of the underframe, and pedals are provided corresponding to the respective pilot valves. Travel pedal device. 4. A solenoid valve is inserted into a pilot circuit that connects the pilot valve and a control valve for controlling the traveling motor, and the solenoid valve is operated via a switch. A traveling pedal device for a construction machine according to claim 3. 5. A bracket having a step with respect to the tread surface is provided on either side of the tread surface of the pedal, and a switch is attached to the bracket. Pedal equipment for construction machinery in Japan. 6. The traveling pedal device for a construction machine according to claim 4, wherein a pilot lamp is inserted in a circuit connecting the solenoid valve and the switch.