JP2005220679A - Traveling operation device of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a traveling operation device of a construction machine which is assembled without the need for welding. <P>SOLUTION: The traveling operation device of the construction machine for the operation of a traveling system of a traveling body 1 comprises a rotary shaft 29 rotatably journaled to a floor board 18a of a cab 18, a bracket 28 fitted to the rotary shaft 29, a traveling pedal 25 fitted to the bracket 28, and a traveling lever 26 whose base end 26a is sandwiched and fixed between the bracket 28 and the traveling pedal 25. Since the traveling lever 26 is fixed to the traveling pedal 25 only by sandwiching and fixing the base end 26a of the traveling lever 26 between the bracket 28 and the traveling pedal 25, assembling work is carried out efficiently in a short time, and work for welding a metal plate to the base end 26a of the traveling lever 26 is eliminated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a traveling operation device for a construction machine that operates a traveling system of a traveling body.

In a construction machine such as a hydraulic excavator equipped with a conventional work machine, since the traveling operation of the traveling body and the operation of the working machine are often performed at the same time, the traveling system of the traveling body can be operated with the hands and feet of the operator. A travel lever and a travel pedal are integrated (for example, Patent Document 1).
In the traveling lever device for a construction machine described in Patent Document 1, a side portion of the traveling pedal having a substantially square character is pivotally supported in the vicinity of a bent portion of the traveling pedal. The base end portion of the traveling lever is fixed with a fixing tool made of a bolt.
Also, when a slot is formed in the rear pedal base and the knob provided on the upper surface of the front pedal is not pressed, the hook of the link is engaged with the slot to lock the rear pedal. The rear pedal is unlocked by simultaneously pressing the knob when depressing the front pedal. When the front pedal is depressed, the rear pedal is unlocked and the rear end of the rear pedal is released. Therefore, there is an effect that the heel of the foot is not pushed up by the rear pedal.

On the other hand, a traveling operation device for a construction machine operates a pilot valve by a traveling lever and a traveling pedal to control the traveling system of the traveling body. Cause fatigue.
For this reason, conventionally, the travel pedal is made of a light metal such as aluminum to reduce the weight, so that the spring constant of the return spring for returning the travel pedal to the neutral position is set low, thereby operating the travel pedal. Since the pedaling pressure at the time is reduced, the fatigue of the operator can be reduced. On the other hand, since the traveling lever made of steel pipe cannot be directly welded to the traveling pedal formed of light metal, it is also described in Patent Document 1 conventionally. As shown, a metal plate is welded to the base end portion of the travel lever, and the metal plate is fixed to the travel pedal by a fastener such as a bolt.
Japanese Utility Model Publication No. 6-33217

  However, a metal plate welded to the base end of the travel lever is fixed to the travel pedal by a fastener, and a metal plate having a mounting hole for inserting the fastener in the base end of the travel lever. In addition, since the metal plate is fixed to the traveling pedal with a fixing tool, there is a problem in that, for example, a welding operation is required and manufacturing is troublesome and the number of parts increases, resulting in an increase in cost.

  The present invention has been made in order to improve such a conventional problem, and an object of the present invention is to provide a traveling operation device for a construction machine that can be assembled without requiring welding.

  A traveling operation device for a construction machine according to the present invention is a traveling operation device for a construction machine that operates a traveling system of a traveling body including a driver's cab, and includes a rotary shaft rotatably supported on a floor plate of the driver's cab, It comprises a bracket attached to the shaft, a travel pedal attached to the bracket, and a travel lever having a base end portion clamped and fixed between the bracket and the travel pedal.

  With the above configuration, the travel lever can be fixed to the travel pedal simply by sandwiching and fixing the base end portion of the travel lever between the bracket and the travel pedal. In addition to being efficient, it is not necessary to weld a metal plate to the base end of the travel lever, so that the number of manufacturing steps and the number of parts can be reduced, and the manufacturing cost associated therewith can be reduced.

  In the traveling operation device for a construction machine according to the present invention, a support portion having a groove is provided on the lower surface of the travel pedal, and the base end portion of the travel lever is fitted into the groove, and the support portion is fixed to the bracket. Thus, the base end portion of the traveling lever is sandwiched and fixed between the bracket and the pedal.

  With this configuration, the outer periphery of the base end portion of the travel lever is constrained by the concave groove and the bracket, so that the travel lever can be more securely fixed to the travel pedal, and there is no gap between the travel pedal and the travel lever. Therefore, the operation feeling is not impaired when the travel lever is operated, and the travel lever is not rattled by vibration during travel or work.

  In the traveling operation device for a construction machine according to the present invention, a taper-shaped protrusion having a leading end side is sequentially provided in the recessed groove, and the protrusion is inserted into a fitting hole formed in a base end portion of the traveling lever. Is.

  With this configuration, the mounting position of the travel lever is positioned with respect to the travel pedal by the protrusion, so that the assembly operation can be performed easily and accurately, and the travel lever can be prevented from being rotated and prevented from coming off by the protrusion. It can be reliably prevented from rotating or coming off easily.

  A traveling operation device for a construction machine according to the present invention includes a traveling body that is capable of traveling freely, a revolving body that is pivotably provided on the traveling body, a driver's cab and a work machine that are installed on the revolving body, and a traveling body that travels. A traveling operation device for a construction machine having a traveling pedal and a traveling lever for operating a system, a rotating shaft rotatably supported on a support member installed on a floor board of a cab, and both ends of the rotating shaft A bracket attached to the portion, a support portion having a concave groove projecting from the lower surface, and a plurality of travel pedals having the support portion fixed to the bracket; a base end portion fitted into the concave groove; and the bracket A plurality of travel levers whose base end portions are clamped and fixed between the support portion and the distal end of the travel lever protruding into the groove and fitted in a fitting hole formed in the base end portion of the travel lever It is comprised from the taper-shaped protrusion from which the side becomes sequential.

With the above configuration, the travel lever can be fixed to the travel pedal simply by sandwiching and fixing the base end portion of the travel lever between the bracket and the travel pedal. In addition to being efficient, it is not necessary to weld a metal plate to the base end of the traveling lever, so that the number of manufacturing steps and the number of parts can be reduced, and the manufacturing cost associated therewith can be reduced.
In addition, since the outer periphery of the base end of the travel lever is constrained by the recessed groove and the bracket, the travel lever can be more securely fixed to the travel pedal, and there is no gap between the travel pedal and the travel lever. When the lever is operated, the operation feeling is not lost, and the traveling lever does not rattle due to vibration during traveling or work.
In addition, the mounting position of the travel lever is positioned with respect to the travel pedal by the protrusion, so that the assembly work can be performed easily and accurately, and the travel lever can be prevented from rotating and coming off by the protrusion, so the operation lever rotates carelessly. And can be reliably prevented from coming off.

  According to the traveling operation device for a construction machine of the present invention, the traveling lever can be fixed to the traveling pedal by simply fixing the base end portion of the traveling lever between the bracket and the traveling pedal. The assembly work of the operating device can be performed efficiently in a short time, and the work of welding a metal plate to the base end of the travel lever is not required, reducing the number of manufacturing steps and the number of parts, and the associated manufacturing cost. It will come to be able to plan.

Embodiments of the present invention will be described in detail with reference to the drawings.
1 is a side view of a construction machine comprising a hydraulic excavator, FIG. 2 is a side view of the interior of a cab, FIG. 3 is an enlarged side view of a traveling operation device, FIG. 4 is a front view thereof, and FIG. FIG. 6 is a cross-sectional view taken along the line, and FIG. 6 is an enlarged view in the circle B of FIG.

The hydraulic excavator shown in FIG. 1 includes a traveling body 1 that is capable of self-propelling and a revolving body 2 that is rotatably disposed on the traveling body 1.
The traveling body 1 has a track frame 3 including a center frame 3a and a pair of side frames 3b provided on both sides of the center frame 3a. An idler 4 is provided at one end of each side frame 3b. A sprocket 6 that is movably supported and is rotationally driven by a traveling motor 5 made of a hydraulic motor is provided on the other end side.
An endless crawler belt 7 is provided between the idler 4 and the sprocket 6, and the crawler belt 7 is driven by the sprocket 6 so that the traveling body 1 can self-propel and the side frame 3b. A plurality of rolling wheels 8 are rotatably supported on the upper and lower portions.

The revolving structure 2 installed on the center frame 3 a of the track frame 3 so as to be able to swivel is constituted by a vehicle body frame 10 at the bottom, and a work machine 11 is mounted at the front center of the vehicle body frame 10.
As shown in FIG. 1, the work machine 11 has a base end pivotally attached to the vehicle body frame 10, a boom 12 that can be raised and lowered by a boom cylinder 13, a base end side pivotally attached to the tip of the boom 12, and an arm cylinder 14. Is constituted by an arm 15 that can be rotated by a pivot, and a bucket 17 that is pivotally attached to the tip of the arm 15 and that can be pivoted by a bucket cylinder 16.
A cab 18 is installed on the left side of the work machine 11 at the front of the body frame 10, and an engine room 19 covered with a bonnet cover 19 a is installed at the rear of the body frame 10. A power engine (not shown) is accommodated therein, and a counterweight 20 is attached to the rear end of the body frame 10.

On the other hand, in the cab 18, as shown in FIG. 2, a driver's seat 22 is installed on a floor plate 18a, and a work implement operating device 23 for operating the work implement 11 is provided on both sides of the driver's seat 22 and the driver's seat. A traveling operation device 24 that operates the traveling system of the traveling body 1 is installed in front of the vehicle 22.
The travel operation device 24 includes a pair of travel pedals 25 that are symmetric with respect to the center of the driver's seat 22 and a pair of travel levers 26 that have base ends attached to the travel pedals 25.
As shown in FIG. 3, each traveling pedal 25 has a side surface that is formed in an inverted shape, and is integrally formed by aluminum die casting to reduce the weight. Is formed.

Further, on the lower surface of each travel pedal 25, a support portion 25a is projected in the vicinity of the bent portion.
The support portion 25a has a concave groove 25b formed on the lower surface in the front-rear direction. The side plate portion 25c outside the concave groove 25b is longer than the inner side plate portion 25d, and the outer side plate portion 25c extends in the front-rear direction. A mounting hole 25e is formed at a distance.
A base end portion 26a of the travel lever 26 is fitted in the concave groove 25b of the support portion 25a.
The travel lever 26 is formed of a steel pipe or the like whose outer diameter is slightly smaller than the width of the concave groove 25b, and an operation knob 27 is attached to the upper end portion. The base end portion 26a is bent substantially horizontally, and the base end portion 26a is formed in the support portion 25a of the travel pedal 25. It is fitted inside from below.

On the bottom surface of the concave groove 25b, a plurality of, for example, two protrusions 25f that serve as positioning of the mounting position of the traveling lever 26 with respect to the traveling pedal 25 and to prevent the traveling lever 26 from rotating and coming off are separated in the front-rear direction, and It protrudes downward.
As shown in FIG. 6, these protrusions 25 f are formed by tapered pins whose tip side is gradually reduced in diameter, and a fitting hole 26 b drilled in the base end portion 26 a of the traveling lever 26 is formed in these protrusions 25 f. The tip end of the protrusion 25f is also fitted from above into a recessed hole 28a formed in the bracket 28 that sandwiches the base end portion 26a of the traveling lever 26 with the bottom surface of the recessed groove 25b. ing.
The bracket 28 attaches each traveling pedal 25 to both ends of the support shaft 29, and is formed by a plate body. When the side plate portion 25c of the support portion 25a is brought into contact with the outer surface, the bracket 28 is formed in the side plate portion 25c. A screw hole 28b is formed at a position that matches the mounting hole 25e.
Shaft holes 28c are formed in the lower part of the bracket 28, and both ends of the rotating shaft 29 are fitted into these shaft holes 28c.

The rotary shaft 29 is horizontally and rotatably supported by a support member 30 fixed on the floor plate 18a, and both end sides protrude outward from both side surfaces of the support member 30, and the lower portion of the bracket 28 is formed at both end portions. The traveling pedal 25 fitted to the bracket 28 and the traveling lever 26 having the base end portion 26a sandwiched between the traveling pedal 25 and the upper surface of the bracket 28 are moved forward and backward around the rotation shaft 29. It is free to rotate.
The brackets 28 attached to both ends of the rotating shaft 29 are prevented from rotating so that the bracket 28 and the rotating shaft 29 rotate integrally with a key 31 penetrating in the front-rear direction of the bracket 28. An operating cam (not shown) is provided in the section, and the spool (not shown) of the pilot valve 33 is operated by this operating cam.
The pilot valve 33 is attached to the lower surface of the floor plate 18a with the operating portion of the spool facing upward as shown in FIGS. 3 to 5, and the operating cam is operated by rotating the rotating shaft 29 by the traveling pedal 25 or the traveling lever 26. Is rotated to operate the spool of the pilot valve 33 in the vertical direction, whereby a hydraulic control valve (not shown) provided in the traveling system is pilot-controlled.

Next, the operation of the construction machine traveling operation device constructed as described above will be described.
In assembling the travel pedal 25 and the travel lever 26, the shaft holes 28a of the bracket 28 are fitted to both ends of the rotating shaft 29 projecting on both side surfaces of the support member 30 fixed on the floor plate 18a. The bracket 31 is attached to the rotary shaft 29 through the key 31 through the rotary shaft 29.
Next, the base end portion 26a of the travel lever 26 is fitted into the concave groove 25b formed in the support portion 25a of the travel pedal 25. At this time, the base end portion 26a of the base end portion 26a is projected to the protrusion 25f protruding in the concave groove 25b. The fitting hole 26b is inserted.

In this state, when the support portion 25a of the travel pedal 25 is placed on the bracket 28 so that the lower surface of the base end portion 26a contacts the upper surface of the bracket 28, a fastener such as a bolt inserted from the mounting hole 25e of the support portion 25a. The travel pedal 25 and the travel lever 26 are attached to the bracket 28 by screwing and tightening the screw 32 into the screw hole 28a of the bracket 28. The travel with the base end portion 26a fitted in the concave groove 25b of the travel pedal 25 is performed. The lever 26 is positioned with respect to the travel pedal 25 by the taper-shaped protrusion 25f, and is prevented from being rotated and prevented from coming off, and the fixing member 33 is tightened to tighten the bottom surface of the concave groove 25f and the bracket 28. Since the base end portion 26a is sandwiched between the upper surface and the upper surface, the traveling lever 26 is securely fixed to the traveling pedal 25. So that it is.
Further, since it is not necessary to weld a metal plate or the like to the base end portion of the travel lever and attach the travel lever 26 to the travel pedal 25, welding work is not required, and the number of parts can be reduced.

  The traveling operation device for a construction machine according to the present invention can be applied not only to a hydraulic excavator but also to all construction machines that may simultaneously operate a traveling system of a traveling body and a working machine.

It is a side view of the construction machine which employ | adopted the traveling operation apparatus which becomes embodiment of this invention. It is a side view of the inside of the cab of the construction machine which employ | adopted the traveling operation apparatus which becomes embodiment of this invention. 1 is a side view of a traveling operation device for a construction machine according to an embodiment of the present invention. It is a front view of the traveling operation apparatus of the construction machine which becomes embodiment of this invention. It is sectional drawing which follows the AA line of FIG. FIG. 6 is an enlarged view in a circle B in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 11 Working machine 18 Driver's cab 18a Floor board 25 Traveling pedal 25a Support part 25b Concave groove 25f Projection 26 Travel lever 26a Base end part 26b Fitting hole 28 Bracket 29 Rotating shaft 30 Support member

Claims (4)

  A traveling operation device for a construction machine that operates a traveling system of a traveling body including a driver's cab, wherein the rotating shaft is rotatably supported on a floor plate of the driver's cab, a bracket attached to the rotating shaft, A travel operation device for a construction machine, comprising: a travel pedal attached to a bracket; and a travel lever having a base end sandwiched and fixed between the bracket and the travel pedal.   By projecting a support portion having a concave groove on the lower surface of the travel pedal, and fitting a base end portion of the travel lever into the concave groove, and fixing the support portion to the bracket, The travel operation device for a construction machine according to claim 1, wherein a base end portion of the travel lever is sandwiched and fixed between the travel pedals.   The construction according to claim 2, wherein a taper-shaped protrusion having a leading end side is sequentially provided in the concave groove, and the protrusion is fitted into a fitting hole formed in a base end portion of the traveling lever. Machine travel operation device.   A self-propelled traveling body, a revolving body provided on the traveling body so as to be able to swivel, a driver's cab and work equipment installed on the revolving body, a traveling pedal for operating a traveling system of the traveling body, and traveling A travel operation device for a construction machine including a lever, wherein a rotation shaft is rotatably supported on a support member installed on a floor board of the cab, and brackets are attached to both ends of the rotation shaft. A plurality of travel pedals having a support portion having a concave groove projecting from the lower surface and the support portion being fixed to the bracket; a base end portion is fitted in the concave groove; and the bracket and the A plurality of travel levers having the base end portion clamped and fixed between the support portion and a fitting hole projecting into the groove and drilled in the base end portion of the travel lever. Characterized in that it has tapered protrusions that are sequentially on the tip side. Set the machine running the operating device.

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