JP2008019590A - Pedal operation device of working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pedal operation device of a working machine, with a simple structure, by facilitating operation by preventing a stepping error, by easily expanding a clearance between adjacent pedals of a plurality of operation pedals arranged in parallel. <P>SOLUTION: The plurality of operation pedals P1 to P4 juxtaposed in the lateral direction on a front floor 20 of an operation seat 16 of the pedal operation device 22, include operation pedals P1 and P2 having an expanding-contracting part K capable of freely expanding and contracting a lateral width W of a pedal tread T. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a pedal operating device for a work machine in which a plurality of operation pedals are arranged side by side.

2. Description of the Related Art A work machine such as a hydraulic excavator includes a driver's seat with many control devices that are operated with both hands and feet of an operator in order to control a machine body and a work device. As a foot maneuvering device, a pair of left and right traveling operation pedals are provided on the floor in front of the driver's seat, and a work device operation pedal corresponding to the type of the work device is provided on each left and right outer side (for example, , See Patent Document 1).

The plurality of operation pedals are installed adjacent to each other because the range of operation by the foot is limited and the floor area of the driver's seat is limited. Therefore, sufficient caution is required for the steering operation so as not to touch the adjacent pedal. In order to prevent accidental stepping, for example, the width of some pedals is narrowed, some pedals are made small and eccentric (see, for example, Patent Document 1), or a cover that can be freely opened and closed by a less frequently used pedal. A means such as adding is adopted (for example, see Patent Document 2).
JP-A-7-292726 (FIG. 1) Japanese Patent Laid-Open No. 10-219756 (FIG. 2)

In the conventional work machine pedal control device of the form as described above, there is a problem that further improvement is desired as follows.

That is, the operation of concentrating attention so as not to make a mistake in pressing the adjacent pedals is an obstacle to efficiently performing the work using the work machine. Narrow pedals are difficult to operate. Furthermore, the installation of the offset pedal and the opening / closing cover requires a special arrangement structure.

The present invention has been made in view of the above facts, and its technical problem is that a plurality of operation pedals arranged in parallel can be easily widened with an adjacent pedal to prevent stepping errors and operation. It is an object of the present invention to provide a pedal control device for a work machine that is easy and simple in structure.

According to the present invention, as a pedal control device that solves the above technical problem, a plurality of operation pedals arranged in parallel in the left-right direction on the floor in front of the driver's seat can expand / contract freely the right / left width of the pedal tread surface There is provided a pedal operating device for a work machine, characterized in that the operating pedal includes an operating pedal having

Preferably, the expansion / contraction part is attached to the operation pedal body so as to be freely folded. Moreover, the expansion / contraction part is provided in the adjacent part of one of the operation pedal for driving | running | working adjacent, and the operation pedal for work apparatus operation.

A pedal control device for a work machine configured according to the present invention is an operation in which a plurality of operation pedals arranged side by side on a floor in front of a driver's seat have expansion / contraction portions that can freely expand / contract the left / right width of the pedal tread surface. Because it includes a pedal, it is provided with an expansion / contraction section in one operation pedal that is not frequently used as a work machine, for example, and the other operation pedal is reduced by reducing the width of the tread surface of this operation pedal. And the other operation pedal can be operated easily, and when operating one operation pedal, the expansion / contraction part can be expanded to enlarge the tread surface.

Therefore, it is possible to easily widen a gap between adjacent pedals of a plurality of operation pedals arranged in parallel, to prevent a stepping error, to easily operate, and to have a simple structure. Can be provided.

Hereinafter, a pedal operating device for a working machine configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment of a hydraulic excavator that is a typical working machine.

The hydraulic excavator will be described with reference to FIG. The hydraulic excavator indicated by the number 2 swivels around the vertical axis 6 on the lower traveling body 4 having a pair of crawler belts 4a and 4b on the left and right (front and rear in the direction perpendicular to the paper surface of FIG. 4). The upper swing body 8 includes an upper swing body 8 that is freely attached. The upper swing body 8 includes an operator's cab 10, an engine chamber 12 installed at the rear of the driver's cab 10, and an articulated work arm device 14 that is mounted at the front of the cab 10. I have.

The work arm device 14 includes a boom 14a attached to the upper swing body 8 so as to be swingable up and down, a telescopic arm 14b attached to the tip of the boom 14a so as to be swingable up and down, and a breaker attached to the tip of the telescopic arm 14b. 14c, a boom operating cylinder 14d is provided between the upper swing body 8 and the boom 14a, an arm operating cylinder 14e is provided between the boom 14a and the extendable arm 14b, and a breaker swings between the extendable arm 14b and the breaker 14c. The cylinder 14f is provided, and the extendable arm 14b is provided with an arm extendable cylinder 14g.

A description will be given with reference to FIG. A pair of operation levers 18a and 18b are provided on the left and right sides of the driver seat 16, and a plurality (four) of operation pedals P1, P2, and P3 arranged side by side in the left-right direction on the floor 20 in front of the driver seat 16. , P4 (hereinafter, these may be simply referred to as operation pedals P).

The left and right operation levers 18a and 18b are formed by joystick levers that operate front and rear and left and right, respectively, and the above four types of devices or functions, that is, the boom operation cylinder 14d, the arm operation cylinder 14e, the breaker swing cylinder 14f, and the upper swing The turning motion of the body 8 is operated.

In the pedal control device 22, a pair of left and right operation pedals P1 and P2 in the center are set as operation pedals for traveling operation, and a pair of left and right operation pedals P3 and P4 are set as operation pedals for operating the work device. Yes.

The operation pedals P1 and P2 for traveling operation include an expansion / contraction portion K that can freely expand and contract the left and right width W of the pedal tread surface T in a portion adjacent to the operation pedals P3 and P4 for operation device operation. The operation pedals P3 and P4 and the expanded pedals P1 and P2 and the tread surface T of the four operation pedals are formed in a rectangular shape having a left and right width W and a front and rear length L.

2 will be described with reference to FIG. 2, which is a side view of the operation pedal P, mainly with reference to FIG. The operation pedal P places a foot on the tread surface T and operates in the front-rear direction indicated by arrows F and R, thereby switching the hydraulic pilot valve 24 installed on the floor 20 and hydraulically operating devices such as a hydraulic cylinder and a hydraulic motor. A directional control valve (not shown) for supplying and discharging pressure oil is controlled.

For example, when the operation pedal P1 is operated in the F direction, one crawler belt 4a is operated in the forward direction by a traveling hydraulic motor (not shown), and when operated in the R direction, the crawler belt 4a is operated in the reverse direction. When the operation pedal P2 is operated, the other crawler belt 4b is similarly activated.

When the operation pedals P3 and P4 are operated, for example, the arm telescopic cylinder 14g set in advance by the operation pedal P3 is expanded and contracted, and the preset breaker 14c is operated on and off by the operation pedal P4.

1 and FIG. 3 mainly showing FIG. 3, which is an enlarged view of a pair of operation pedals P1 and P3 including an operation pedal P1 having an expansion / contraction portion K that expands / contracts the lateral width of the tread surface T of the operation pedal P. I will explain. The operation pedals P2 and P4 are formed symmetrically in the left-right direction where the operation pedals P1 and P3 and the four operation pedals P are disposed.

The expansion / contraction part K is attached to the pedal body PP so as to be freely folded. That is, the width W is divided into a width W1 of the pedal body PP and a width W2 of the expansion / contraction part K, and both ends of the length L are connected by a pair of hinges 26 and 26.

Accordingly, the expansion / contraction portion K of the operation pedal P1 (P2) is 180 in the direction in which the end portion of the expansion / contraction portion K and the end portion of the main body portion PP abut in the direction away from the tread surface T of the pedal main body PP indicated by the arrow Y1 around the hinge 26. When rotated, a tread surface T having a width W is formed (indicated by a solid line in FIG. 3). At this time, a relatively narrow gap S1 is provided between the adjacent operation pedals P3 (P4).

When the expansion / contraction portion K is rotated about the hinge 26 until it is folded on the tread surface T of the pedal body PP indicated by the arrow Y2 (state indicated by a two-dot chain line in FIG. 3), the width of the tread surface T is reduced to W1, An expanded gap S2 is formed between the adjacent operation pedals P3 (P4).

The effect of the pedal control device 22 of the work machine as described above will be described.

The pedal control device 22 has a plurality of operation pedals P1, P2, P3, and P4 arranged side by side on the floor 20 in front of the driver's seat 16 so that the left and right width W of the pedal tread surface T can be freely expanded and reduced. Since the operation pedals P1 and P2 having the part K are included, one of the operation pedals P1 and P2 that is less frequently used as a work machine, for example, includes the expansion / contraction part K, and the tread surface T of the one operation pedal P1 or P2 By narrowing the width, the gap between the other operation pedals P3 and P4 can be widened from S1 to S2, and the operation of the other operation pedals P3 and P4 can be facilitated. When operating one of the operation pedals P1 and P2, the expansion / contraction part K can be widened to increase the tread surface.

Therefore, it is possible to easily widen a gap between adjacent pedals of a plurality of operation pedals arranged in parallel, to prevent a stepping error, to easily operate, and to have a simple structure. Can be provided.

Further, the expansion / contraction portion K is attached to the main body PP of the operation pedal P by the hinge 26 so that the expansion / contraction can be freely performed. Therefore, the expansion / contraction adjustment of the tread surface T is easy, and the tread surface T is expanded / contracted with an inexpensive and simple mechanism. be able to.

Furthermore, the expansion / contraction part K is provided in an adjacent portion of the operation pedal P1 (P2) for traveling operation, one of the adjacent operation pedal P1 (P2) for traveling operation and the operation pedal P3 (P4) for operating the work device. It has been. Therefore, like the hydraulic excavator 2 shown in FIG. 4, it is effective for a work machine that mainly performs work by the work arm device 14 in a state in which the machine body is stopped with a low movement frequency due to traveling.

That is, when moving and moving the place, the expansion / contraction part K of the operation pedal P1 (P2) is expanded, and when the work is stopped and the work is performed, the expansion / contraction part K is contracted, and the adjacent operation pedal P3 (P4) for operating the work device is operated. ), The operator can concentrate on the work without paying attention to the wrong pedal, and the work efficiency can be improved.

The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various changes or modifications can be made within the scope of the present invention, for example, as described below. Is.

In the embodiment of the present invention, four operation pedals P1 to P4 are provided as a plurality of operation pedals, but the present invention can be applied if the number of operation pedals is two or more.

In the embodiment of the present invention, the expansion / contraction part K is foldably attached to the main body PP of the operation pedal P, but the expansion / contraction part K can be any one that can freely expand / contract the width W of the tread surface T. For example, it may be a structure that is inserted into and removed from the main body PP.

In the embodiment of the present invention, the expansion / contraction part K is an adjacent part of the operation pedal P1 (P2), one of the adjacent operation pedal P1 (P2) for traveling operation and the operation pedal P3 (P4) for operation of the work device. However, it is convenient to provide the expansion / contraction part K in the operation pedal P3 (P4) for operating the work apparatus in a work machine mainly traveling such as a bulldozer.

The top view of the pedal control apparatus of the working machine comprised according to this invention. The enlarged view seen in the arrow D direction of FIG. FIG. 2 is an enlarged side view of the operation pedal, with the floor surface facing downward as viewed in the direction of arrows AA in FIG. 1. (A) The enlarged detail drawing of a pair of operation pedal shown by B in FIG. (B) The side view which looked at the figure of (a) in the arrow CC direction. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a hydraulic excavator that is a representative example of a work machine provided with a pedal control device for a work machine configured according to the present invention.

Explanation of symbols

2: Excavator (work machine)
16: Driver's seat 20: Floor 22: Pedal control device P: Operation pedal P1: Operation pedal (operation pedal for traveling operation)
P2: Operation pedal (operation pedal for running operation)
P3: Operation pedal (operation pedal for operating the work equipment)
P4: Operating pedal (operating pedal for operating the work equipment)
K: expansion / contraction part T: pedal tread W: left-right width

Claims (3)

A plurality of operation pedals arranged side by side on the floor in front of the driver's seat,
It includes an operation pedal with an expansion / contraction part that can freely expand / contract the left / right width of the pedal tread surface,
A pedal operating device for a working machine. The expansion / contraction part
Folding is freely attached to the operation pedal body,
The pedal steering device for a work machine according to claim 1. The expansion / contraction part
One of an adjacent operation pedal for traveling operation and an operation pedal for operating a work device is provided in an adjacent portion.
The pedal steering device for a work machine according to claim 1 or 2, wherein

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