JP2022141298A - Construction machine - Google Patents

Abstract

To make an operation feeling constant even when an operation direction of an operation pedal is changed, achieve an entire size reduction and make a pilot valve less likely to be soiled.SOLUTION: An operation pedal 19 is provided so as to be switchable between a front and rear operation position for performing a front step-on operation of stepping on a front side and a rear step-on operation of stepping on a rear side, and a right and left operation position for performing a left step-on operation of stepping on a left side and a right step-on operation of stepping on a right side. By virtue of this, in a pilot valve 17, a first pusher 17D of the pilot valve 17 is pushed with the front step-on operation in the front and rear operation position of the operation pedal 19 and with the right step-on operation in the right and left operation position of the operation pedal 19, and a second pusher 17E of the pilot valve 17 is pushed with the rear step-on operation in the front and rear operation position of the operation pedal 19 and with the left step-on operation in the right and left operation position of the operation pedal 19.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine provided with an operation pedal that is stepped on by an operator in front of the driver's seat.

A hydraulic excavator, which is a representative example of construction machinery, includes a self-propelled lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and a rotatable front side of the upper revolving body. and a device.

An upper revolving body that constitutes the vehicle body has a driver's seat on which an operator sits on a floor plate. In front of the driver's seat, a traveling lever/pedal device is provided which is positioned on the floor board and used to cause the lower traveling body to travel. In addition, operation pedal devices for operating a part of the working device and the like are provided on both the left and right sides or one side of the traveling lever/pedal device.

The operation pedal device is provided on the floor plate, and includes a pilot valve that controls the supply and discharge of the pilot pressure by pushing the first pusher and the second pusher, and a rotatable upper side of the pilot valve, which is operated by foot. and an operation pedal that pushes the first pusher and the second pusher to operate the working device.

Here, the operation pedal device has a forward/backward operation position in which a front stepping operation in which the front side of the operation pedal is stepped on and a post stepping operation in which the rear side of the operation pedal is stepped on, a left stepping operation in which the left side of the operation pedal is stepped in, and a right stepping operation in which the right side of the operation pedal is stepped on. There are two types of operation positions, the right and left operation position to perform.

Therefore, some hydraulic excavators are designed so that the operation pedal can be switched between two operating positions according to the operator's preference. This operation pedal switching mechanism includes a vertical shaft extending in the front-rear direction for rotating the operation pedal in the left-right direction, and a vertical shaft positioned below the vertical shaft for rotating the operation pedal in the front-rear direction. and a horizontal shaft extending in the left-right direction. When the operation pedal is rotated in the front-rear direction, the rotation of the vertical axis is locked, and when the operation pedal is rotated in the left-right direction, the rotation of the horizontal axis is locked. (see Patent Document 1).

JP 2013-109582 A

In the operation pedal switching mechanism of Patent Document 1, when the operation pedal is operated in the left-right direction, it can be operated without any particular discomfort. Since the shaft is far away from the operation pedal, the operation pedal swings back and forth. For this reason, there is a problem that the operational feeling differs from that in the left and right operation positions when the operation pedal is in the front and rear operation positions.

Further, in the operation pedal switching mechanism of Patent Document 1, the vertical axis and the horizontal axis are arranged so as to overlap each other in the vertical direction, so the height dimension from the pilot valve to the operation pedal becomes large. Therefore, each pusher of the pilot valve needs to protrude greatly toward the operation pedal, and is exposed to the outside. For this reason, each pusher is easily soiled by adhesion of mud or the like, and there is a problem that cleaning work is troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a construction machine which can maintain a constant feeling of operation even when the operating direction of the operation pedal is switched, and which can be downsized as a whole and simplified in cleaning work. to do.

The present invention comprises a vehicle body provided with a working device, a driver's seat provided on a floor plate of the vehicle body, a front side of the driver's seat provided on the floor plate, and a first pusher and a second pusher pushing a pusher. a pilot valve that controls the supply and discharge of the pilot pressure by being moved; and an operation pedal for operating the work device, wherein the operation pedal is arranged to extend in the front-rear direction, and before and after performing a front stepping operation of stepping on the front side and a post stepping operation of stepping on the rear side. The pilot valve is switchable between an operation position and a left-right operation position for performing a left stepping operation to step on the left side and a right stepping operation to step on the right side in a state extending in the left-right direction. The first pusher is pushed by either the front stepping operation at the front-rear operation position or the left stepping operation or the right stepping operation at the left-right operation position of the operation pedal, and the operation pedal The second pusher is pushed by either the rear stepping operation at the front/rear operation position or the left stepping operation or the right stepping operation at the left/right operation position of the operation pedal.

According to the present invention, even when the operation direction of the operation pedal is switched, the operation feeling can be kept constant, and the overall size can be reduced and the cleaning operation can be simplified.

It is a left view showing a hydraulic excavator according to an embodiment of the present invention. FIG. 2 is an enlarged plan view showing the hydraulic excavator with the canopy and part of the working device omitted; 3 is an enlarged plan view showing the left operation pedal device in FIG. 2; FIG. It is the perspective view which looked at the left operation-pedal apparatus from the diagonally right rear side. It is the perspective view which looked at the left operation-pedal apparatus from the diagonally front right side. FIG. 4 is a cross-sectional view of the left operation pedal device viewed from the direction of arrows VI-VI in FIG. 3; FIG. 4 is a plan view showing together a pilot valve and an operation pedal (a chain double-dashed line) arranged at a front-rear operation position; FIG. 4 is a plan view showing together a pilot valve and an operation pedal (a chain double-dashed line) arranged at left and right operation positions; FIG. 6 is a perspective view showing an exploded mounting base and operation pedals in FIG. 5 ; FIG. 3 is a perspective view showing an exploded operation pedal; FIG. 4 is a cross-sectional view of the mounting state of the operation pedal (leg portion) to the mounting base, viewed in the direction of arrows XI-XI in FIG. 3; FIG. 4 is a cross-sectional view showing an exploded mounting base and an operation pedal (leg portion); FIG. 5 is a cross-sectional view showing a state in which the fitting projection of the mounting base is inserted into the first fixture (second fixture) of the leg of the operation pedal;

1 to 13, an embodiment of a construction machine according to the present invention will be described in detail with reference to FIGS.

In FIG. 1, a hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2, an upper revolving body 3 which is rotatably mounted on the lower traveling body 2 and constitutes a vehicle body together with the lower traveling body 2, an upper A work device 4 is provided rotatably on the front portion of the revolving body 3 to perform earth and sand excavation work and the like.

The working device 4 includes a lower boom 4A whose proximal foot portion is rotatably attached to a left vertical plate 5B and a right vertical plate 5C of a revolving frame 5, which will be described later, and a tip end of the lower boom 4A that swings in the left-right direction. an upper boom 4B movably attached, an arm support member 4C attached to the tip of the upper boom 4B so as to be able to swing in the left-right direction, an arm 4D rotatably attached to the tip of the arm support member 4C, Bucket 4E rotatably attached to the tip of arm 4D, link 4F connecting lower boom 4A and arm support member 4C, boom cylinder (not shown) for operating them, offset cylinder 4G, an arm cylinder 4H, and a bucket cylinder 4J.

As a result, the upper revolving body 3 rotates the lower boom 4A of the working device 4 upward or rearward to the maximum, and folds the arm 4D toward the upper boom 4B side. It is configured to be able to turn within the vehicle width of the lower traveling body 2 .

As shown in FIG. 2, the revolving frame 5 includes a flat bottom plate 5A, and a left vertical plate 5B and a right vertical plate 5C which stand on the bottom plate 5A and extend in the front-rear direction with a gap in the left-right direction. consists of A foot portion of the lower boom 4A is rotatably attached to the left and right vertical plates 5B and 5C.

It should be noted that the working device 4 can be attached with other working tools such as a grapple and a breaker instead of the bucket 4E. Thus, when a grapple, breaker, or the like is attached instead of the bucket 4E, operation pedal devices 11 and 12, which will be described later, are required in order to perform operations other than rotation, such as rotation and clamping.

The floor plate 6 is provided on the upper side of the revolving frame 5 forming a part of the vehicle body. The floor plate 6 is formed in a stepped shape so that the rear side thereof covers the engine (not shown). On the other hand, the front side of the floor plate 6 is formed flat so that an operator seated in a driver's seat 7 described later can put his/her feet thereon. On the front side of the floor plate 6, on the left side of the travel lever/pedal device 10, which will be described later, is provided a valve mounting opening 6A and a screw hole 6B arranged at a position sandwiching the valve mounting opening 6A in the front-rear direction. (See FIG. 6). Similarly, on the front side of the floor plate 6 and on the right side of the traveling lever/pedal device 10, a valve mounting opening and a screw hole (both not shown) are provided.

The driver's seat 7 is positioned on the rear side of the floorboard 6 and provided on the floorboard 6 . The driver's seat 7 is for an operator who operates the hydraulic excavator 1 to sit. A left operating lever device 8 and a right operating lever device 9 for operating the working device 4 and the like are arranged on the left and right sides of the driver's seat 7 .

A pair of left and right travel lever/pedal devices 10 are provided on the front portion of the floor plate 6 . The traveling lever/pedal device 10 is manually operated or stepped on to cause the lower traveling body 2 to travel. Further, a left operation pedal device 11 and a right operation pedal device 12, which will be described later, are provided on both sides of the travel lever/pedal device 10 in the left-right direction on the front portion of the floor plate 6. As shown in FIG.

As shown in FIG. 2 , the left operation pedal device 11 is located on the left side of the travel lever/pedal device 10 and provided in front of the floor plate 6 . The right operation pedal device 12 is located on the right side of the travel lever/pedal device 10 and provided in front of the floor plate 6 . The left operation pedal device 11 moves the operation pedal 19 along a straight line OA passing through the left side of the travel lever/pedal device 10 among radial straight lines (radial lines) centering on a point O near the center of the seat surface of the driver's seat 7 . are placed. In the right operation pedal device 12 , the operation pedal 19 is arranged along a straight line OB passing through the right side of the travel lever/pedal device 10 among the radial straight lines centered on the point O.

Here, since the left operation pedal device 11 and the right operation pedal device 12 have a symmetrical structure in the left-right direction, the left operation pedal device 11 will be explained and the explanation of the right operation pedal device 12 will be omitted. .

As shown in FIGS. 3 to 13, the left operation pedal device 11 includes a mounting base 13, a pilot valve 17, and an operation pedal 19, which will be described later.

The mounting base 13 is provided on the front side of the floorboard 6 as part of the floorboard 6 . The mounting base 13 functions as an attachment for mounting the pilot valve 17 on the floor plate 6 in a predetermined position and in a predetermined orientation, and constitutes a part of the floor plate 6 . That is, as shown in FIG. 6, the mount 13 is provided between the floor plate 6 and the bracket 17B of the pilot valve 17 so as to close the valve mounting opening 6A of the floor plate 6. As shown in FIG. As shown in FIG. 9, the mounting base 13 is formed of a rectangular plate, and a rectangular insertion opening 13A through which the casing 17A of the pilot valve 17 is inserted is formed in the center thereof. Further, bolt insertion holes 13B are provided at front and rear positions of the mounting base 13 so as to correspond to the screw holes 6B of the floor plate 6. As shown in FIG.

Rectangular recessed grooves 14A to 14D are formed on the surface (upper surface) of the mounting base 13 at four locations at intervals of 90 degrees in the circumferential direction around the center point C (see FIGS. 7 and 8) of the mounting base 13. is provided. Recessed grooves 14A-14D extend along a ray about center point C. As shown in FIG. Specifically, the recessed grooves 14A to 14D are each arranged at an angle of 45 degrees with respect to a straight line D passing through the center point C of the mount 13 and extending in the longitudinal direction.

Fitting projections 15A to 15D are located near the center point C and protrude upward from the recessed grooves 14A to 14D. Engagement grooves 16A to 16D as engagement portions are formed in the upper portions of the fitting projections 15A to 15D by notching the end faces on the side of the center point C (on the side of the pilot valve 17) in the horizontal direction.

Among the recessed grooves 14A to 14D, the fitting projections 15A to 15D, and the engaging grooves 16A to 16D, the recessed grooves 14A, 14C, the fitting projections 15A, 15C, and the engaging grooves are arranged at symmetrical positions with respect to the center point C. 16A and 16C constitute a front/rear operation mounting portion. The recessed grooves 14B and 14D, the fitting protrusions 15B and 15D, and the engaging groove portions 16B and 16D, which are arranged at symmetrical positions with respect to the center point C, constitute a left/right operation mounting portion.

The recessed grooves 14A and 14C, which serve as a pair of front and rear operation mounting portions, form a part of the pair of leg portions 21B and 21C when the operation pedal 19 is arranged at a front and rear operation position (position shown in FIG. 7) which will be described later. Fixtures 22, 23 are attached. Further, recessed grooves 14B and 14D serving as a pair of left and right operation mounting portions are provided with a portion of a pair of leg portions 21B and 21C when the operation pedal 19 is arranged at a left and right operation position (position shown in FIG. 8) which will be described later. are attached. In this case, the fitting bodies 22A and 23A of the fixtures 22 and 23 are fitted into the recessed grooves 14A to 14D, so that the fitting bodies 22A and 23A can be fixed in the horizontal direction (front-rear direction and left-right direction).

The pilot valve 17 is located on the front side of the driver's seat 7 and provided on the floor plate 6 . The pilot valve 17 is mounted on the front left side of the floor plate 6 while being inserted into the valve mounting opening 6A. The pilot valve 17 controls supply and discharge of pilot pressure to a control valve device (not shown) mounted on the revolving frame 5 . This pilot valve 17 is a pressure reducing valve type pilot valve, and as shown in FIGS. A pedal mounting plate 17C provided on the upper side of 17B so as to be rotatable in the vertical direction; and a second pusher 17E. Both ends of the bracket 17B protrude from the casing 17A in the front-rear direction, and bolt insertion holes 17F are formed through the bracket 17B in the vertical direction.

When the pilot valve 17 is attached to the floor plate 6, as shown in FIG. 6, the mounting base 13 is arranged so as to close the valve mounting opening 6A, and the casing 17A is inserted through the insertion opening 13A of the mounting base 13 from above. , the bracket 17B is brought into contact with the mount 13. As shown in FIG. In this state, the bolt 18 is inserted through the bolt insertion hole 17F of the bracket 17B and the bolt insertion hole 13B of the mount 13, and screwed into the screw hole 6B of the floor plate 6. Thereby, the pilot valve 17 can be attached to the floor plate 6 .

Here, as shown in FIG. 7, the pilot valve 17 is provided along a straight line D extending in the longitudinal direction in plan view. Specifically, a straight line passing through the center line that bisects the casing 17A forming the pilot valve 17, the bracket 17B, and the pedal mounting plate 17C in the width direction, the axis of the first pusher 17D, and the axis of the second pusher 17E is It is the same as the straight line D in plan view. The pilot valve 17 is arranged in a state inclined with respect to the straight line OA, specifically, at a position where the straight line D is rotated from the straight line OA by an angle α (for example, 45 degrees) about the center point C. ing. In FIG. 7, the pilot valve 17 (straight line D) is arranged at a position rotated clockwise by an angle α with respect to the straight line OA, but it may be arranged at a position rotated counterclockwise by an angle α. can also Also, the angle α is not limited to 45 degrees.

The pilot valve 17 is arranged at different angular positions with respect to both a straight line OA extending forward from the driver's seat 7 and a straight line E orthogonal to the straight line OA. Therefore, even when the operation pedal 19 is arranged in either the front-rear operation position shown in FIG. 7 or the left-right operation position shown in FIG. 2 pushers 17E are arranged. As a result, the first pusher 17D and the second pusher 17E can be pushed by the operation pedal 19 at both the front-rear operation position and the left-right operation position.

Specifically, the first pusher 17D of the pilot valve 17 is pushed by the forward depression operation of the operation pedal 19 at the forward/backward operation position and the right depression operation of the operation pedal 19 at the left/right operation position. On the other hand, the second pusher 17E of the pilot valve 17 is pushed by the rearward depression operation of the operation pedal 19 at the front/rear operation position and the left depression operation of the operation pedal 19 at the left/right operation position.

The operation pedal 19 is rotatably provided above the pilot valve 17 . The operation pedal 19 pushes the first pusher 17D and the second pusher 17E to operate the work device 4 by stepping on a pedal member 20, which will be described later.

The operation pedal 19 is placed in a front-rear operation position (see FIG. 7) in which a front stepping operation of stepping on the front side of the pedal member 20 and a post-stepping operation of stepping on the rear side of the pedal member 20 are performed with the pedal member 20 arranged to extend in the front-rear direction. ), and a left/right operation position (shown in FIG. 8) in which the left stepping operation of stepping on the left side of the pedal member 20 and the right stepping operation of stepping on the right side of the pedal member 20 are performed with the pedal member 20 extending in the horizontal direction. position) and can be switched.

That is, in the present embodiment, the operation pedal 19 pushes the first pusher 17D of the pilot valve 17 by forward depression at the front/rear operation position and right depression at the left/right operation position. On the other hand, the operation pedal 19 is configured to push the second pusher 17E of the pilot valve 17 by a rearward depression operation at the front/rear operation position and a left depression operation at the left/right operation position. The operation pedal 19 includes a pedal member 20 and a support member 21, which will be described later.

As shown in FIG. 3 and the like, the pedal member 20 is formed as, for example, a rectangular plate and arranged above the pilot valve 17 . As shown in FIG. 6, the lower surface of the pedal member 20 is close to the upper surface of the pedal mounting plate 17C of the pilot valve 17. As shown in FIG. As shown in FIG. 10, the pedal member 20 has a shaft hole 20A penetrating in the left-right direction at an intermediate position in the length direction.

An axis F of the shaft hole 20A is a rotation axis when the operation pedal 19 (pedal member 20) is stepped on. The axis F of the shaft hole 20A is aligned with or parallel to the straight line E when the operation pedal 19 is arranged at the front-rear operation position shown in FIG. Further, when the operation pedal 19 is arranged in the left and right operation position shown in FIG. 8, the axis F is aligned with or parallel to the straight line OA.

In other words, when the pedal member 20 of the operation pedal 19 is stepped on, the axis F of the shaft hole 20A is arranged at an angle in plan view with respect to the straight line D connecting the first pusher 17D and the second pusher 17E. ing. That is, as shown in FIGS. 7 and 8, the axis F is always arranged at an angle of 45 degrees with respect to the straight line D. As shown in FIG.

The pedal member 20 has a first stepping portion 20B on one side in the length direction and a second stepping portion 20C on the other side in the length direction. The operation pedal 19 pushes the first pusher 17D via the pedal mounting plate 17C of the pilot valve 17 when the first stepping portion 20B of the pedal member 20 is stepped on while the operation pedal 19 is arranged at the forward/backward operation position. Further, when the second stepping portion 20C of the pedal member 20 is stepped on, the second pusher 17E is pushed.

On the other hand, the operation pedal 19 pushes the first pusher 17D when the first step portion 20B is stepped on in a state of being arranged at the left/right operation position. Further, the second pusher 17E is pushed by stepping on the second stepping portion 20C.

As shown in FIG. 10, the support member 21 is composed of a shaft portion 21A and a pair of leg portions 21B and 21C. The shaft portion 21A extends horizontally and is rotatably inserted through the shaft hole 20A of the pedal member 20 . The leg portion 21B is bent at right angles from one end portion of the shaft portion 21A and extends downward. The leg portion 21C extends in the vertical direction so as to be parallel to the leg portion 21B, and the upper end is attached to the other end of the shaft portion 21A.

The first fixture 22 forms part of the leg portion 21B and is provided at the lower end of the leg portion 21B. The first fixture 22 includes a fitting body 22A formed of a horizontally elongated rectangular parallelepiped block, an insertion hole 22B provided in the fitting body 22A, and a fixing portion 22C provided on the upper side of the fitting body 22A. is composed of

As shown in FIGS. 11 to 13, the fitting body 22A has its lower portion fitted into the recessed groove 14A of the mounting base 13 with a slight gap. The fitting body 22A is positioned (fixed) in the horizontal direction (front-rear direction, left-right direction) with respect to the mounting base 13 in a state where it is fitted in the recessed groove 14A. A lower end of the leg portion 21B is integrally attached to one side of the fitting body 22A in the length direction.

The insertion hole 22B is provided on the other lengthwise side of the fitting body 22A. The insertion hole 22B is formed as a square hole vertically penetrating the fitting body 22A. The fitting projection 15A of the mount 13 is inserted through the insertion hole 22B.

22 C of fixing|fixed parts are provided in the upper surface of 22 A of fitting bodies. 22 C of fixing|fixed parts are located above the insertion hole 22B, and are provided slidably in the length direction of 22 A of fitting bodies. The fixing portion 22C has an insertion hole 22C1 into which the fitting projection 15A of the mounting base 13 projecting upward from the insertion hole 22B is inserted, and a leg portion 21B side with the fitting projection 15A inserted into the insertion hole 22C1. It has an engaging claw 22C2 that engages with the engaging groove portion 16A by moving.

As shown in FIGS. 12 and 13, the fixing portion 22C has the lower portion of the fitting body 22A fitted into the recessed groove 14A of the mounting base 13, and the fitting protrusion 15A of the mounting base 13 is inserted into the insertion hole 22B. The upper portion of the fitting projection 15A is inserted into the insertion hole 22C1 of the fixing portion 22C. In this state, the fixed portion 22C is slid toward the leg portion 21B, and as shown in FIG. 11, the engaging claw 22C2 is engaged with the engaging groove portion 16A. As a result, the leg portion 21B can be fixed by manual operation of the fixing portion 22C at the mounting position with respect to the recessed groove 14A or the like serving as the front-rear operation mounting portion.

In the fixing portion 22C of the first mounting member 22, the direction in which the engaging claw 22C2 is separated from the engaging groove portion 16A is the inward direction toward the pilot valve 17 side. On the other hand, when the pedal member 20 is stepped on, the load acting on the leg portion 21</b>B acts in the outward direction opposite to the pilot valve 17 or in the longitudinal direction of the pilot valve 17 . Therefore, when the pedal member 20 is stepped on, the load acting on the leg portion 21B does not act to disengage the engaging claw 22C2 from the engaging groove portion 16A. will not be

The second fixture 23 constitutes a part of the leg portion 21C, and, like the first fixture 22, includes a fitting body 23A, an insertion hole 22B, and a fixing portion 23C (insertion hole 23C1, engaging claw 23C2). is composed of The configuration and mounting structure of the second mounting member 23 are the same as those of the first mounting member 22, and therefore will be omitted.

Next, a procedure for switching the operation pedal 19 between the front/rear operation position extending in the front/rear direction and the left/right operation position extending in the left/right direction will be described.

First, when the operation pedal 19 is attached to the mounting base 13 on the side of the floor plate 6 in the front-rear operation position, the fitting body 22A of the first mounting fixture 22 is fitted into the recessed groove 14A of the mounting base 13, and the fixing portion 22C is slid. Then, the leg portion 21B is attached to the mounting base 13. As shown in FIG. Also, the fitting body 23A of the second fixture 23 is fitted into the recessed groove 14C of the mounting base 13, and the leg part 21C is mounted on the mounting base 13 by sliding the fixed part 23C.

On the other hand, when the operation pedal 19 is attached to the mounting base 13 on the side of the floor plate 6 in the left/right operation position, the fitting body 22A of the first mounting fixture 22 is fitted into the recessed groove 14B of the mounting base 13, and the fixing portion 22C is slid. Then, the leg portion 21B is attached to the mounting base 13. As shown in FIG. Further, the fitting body 23A of the second fixture 23 is fitted into the recessed groove 14D of the mounting base 13, and the fixing part 23C is slid to mount the leg part 21C to the mounting base 13. As shown in FIG.

The canopy 24 is provided above the floor plate 6 so as to cover the upper side and the right side of the driver's seat 7 . The canopy 24 is configured as a three-post canopy, for example.

The hydraulic excavator 1 according to this embodiment has the configuration as described above, and the operation thereof will be described next.

First, the operator gets on the floorboard 6 and sits on the driver's seat 7 . An operator seated in the driver's seat 7 operates the traveling lever/pedal device 10 to cause the lower traveling body 2 to travel. On the other hand, by operating the left operating lever device 8 and the right operating lever device 9, the operator can swing the upper swing body 3, excavate earth and sand with the work device 4, and the like.

Next, in place of the bucket 4E of the working device 4, the hydraulic excavator 1 is equipped with an operation pedal device for performing other operations such as rotation and clamping, in order to cope with the case where, for example, a grapple is attached. 11 and 12.

Here, the operation pedal devices 11 and 12 have a front/rear operation position in which the operation pedal 19 (pedal member 20) extends in the front-rear direction, and a left/right operation position in which the operation pedal 19 (pedal member 20) extends in the left-right direction. Can be switched to and from positions. That is, the operation pedal devices 11 and 12 can switch between the front and rear stepping operation and the left and right stepping operation according to the preference of the operator.

Therefore, the operation of the left operation pedal device 11 in the front/rear operation position, an example of the work procedure when switching from the front/rear operation position to the left/right operation position, and the operation of the left operation pedal device 11 in the left/right operation position will be described.

As shown in FIG. 7, in the front-rear operation position of the left operation pedal device 11 in which the operation pedal 19 is arranged to extend in the front-rear direction, the pedal member 20 is rotatably supported about an axis F orthogonal to the straight line OA. It is Therefore, in the front-rear operation position of the left operation pedal device 11, the first pusher 17D of the pilot valve 17 located on the front side of the axis F can be pushed by stepping on the first stepping portion 20B located on the front side. . On the other hand, by stepping on the second stepping portion 20C located on the rear side, the second pusher 17E of the pilot valve 17 located on the rear side of the axis F can be pushed.

Next, when the operation pedal 19 is removed from the mount 13 in order to switch from the front/rear operation position to the left/right operation position, the fixing portion 22C is slid inward (toward the pilot valve 17) in the disengagement direction. As a result, as shown in FIG. 13, the engaging claw 22C2 of the fixing portion 22C is disengaged from the engaging groove portion 16A of the mounting base 13, and the lock by the first mounting member 22 is released. Similarly, the lock by the second attachment 23 is released by operating the fixing portion 23C. As a result, the operation pedal 19 can be removed from the mounting base 13 simply by lifting it. The operation pedal 19 can be easily removed without using a screw tightening tool such as a wrench.

After the operation pedal 19 is removed from the mounting base 13, the operation pedal 19 is rotated clockwise by 90 degrees and placed in the left and right operation position, as shown in FIG. In this left/right operation position, the fitting body 22A is fitted into the recessed groove 14B, and the fixing part 22C is slid outward (opposite side of the pilot valve 17), contrary to the unlocking procedure of the first fixture 22 described above. Let Thereby, the first fixture 22 can be attached to the mounting base 13 in a locked state. Similarly, by fitting the fitting body 23A of the second fixture 23 into the recessed groove 14D of the mounting base 13 and sliding the fixing part 23C, the second fixture 23 is attached to the mounting base 13 in a locked state. be able to. This operation pedal 19 can be easily attached without using a screw tightening tool such as a wrench. Note that the operation pedal 19 may be rotated counterclockwise by 90 degrees and placed in the left/right operation position.

As shown in FIG. 8, in the left-right operation position of the left operation pedal device 11 in which the operation pedal 19 is arranged to extend in the left-right direction, the pedal member 20 is rotatably supported about the axis line F along the straight line OA. It is Therefore, in the left-right operation position of the left operation pedal device 11, the first pusher 17D of the pilot valve 17 located on the right side of the axis F can be pushed by depressing the first stepping portion 20B located on the right side. . On the other hand, by depressing the second stepping portion 20C located on the left side, the second pusher 17E of the pilot valve 17 located on the left side of the axis F can be pushed.

Thus, according to the present embodiment, the operation pedal 19 extends in the front-rear direction and extends in the front-rear operation position in which the front stepping operation and the rear stepping operation are performed. In the arranged state, it is provided so as to be switchable between left and right operation positions for performing a left stepping operation of stepping on the left side and a right stepping operation of stepping on the right side. On this basis, the pilot valve 17 pushes the first pusher 17D of the pilot valve 17 by depressing the operation pedal 19 to the front/rear operation position and depressing the operation pedal 19 to the right/left operation position. The second pusher 17E of the pilot valve 17 is pushed by the backward stepping operation at the front/rear operation position and the left stepping operation at the left/right operation position of the operation pedal 19 .

Therefore, the operation pedal 19 can be provided to the operator at a desired operation position by simply switching the mounting position of the operation pedal 19 with respect to the floor plate 6 (mounting base 13) between the front-rear operation position and the left-right operation position. Moreover, since the front/rear operation position and the left/right operation position of the operation pedal 19 are switched between a position extending in the front/rear direction and a position extending in the left/right direction, the operation pedal 19 has two shafts vertically overlapped. It can be arranged at a position close to the upper side of the pilot valve 17 as compared with the patent document 1 described above. As a result, the operation pedal 19 can be largely rotated in both the front-rear operation position and the left-right operation position, so that the first pusher 17D and the second pusher 17E can be pushed efficiently. Further, since the operation pedal 19 can be rotated in the same manner at the front/rear operation position and the left/right operation position, the operation feeling can be the same at the front/rear operation position and the left/right operation position.

As a result, even when the operation direction of the operation pedal 19 is switched, the operation feeling can be made constant, and the operability can be improved. Further, since the operation pedal 19 can be arranged at a position close to the upper side of the pilot valve 17, the entire operation pedal devices 11 and 12 including the pilot valve 17 can be miniaturized. Furthermore, since the first pusher 17D and the second pusher 17E of the pilot valve 17 can be shortened to reduce or eliminate the exposed portion, the first pusher 17D and the second pusher 17E can be made less dirty, and maintenance such as cleaning can be performed. can be simplified.

The axis F of the shaft hole 20A of the pedal member 20, which is the rotation axis when the operation pedal 19 is stepped on, is aligned with the straight line D connecting the first pusher 17D and the second pusher 17E of the pilot valve 17 in a plan view. placed at an oblique angle. As a result, the first pusher 17D and the second pusher 17E can be pushed by the pedal member 20 at any position of the front/rear operation position and the left/right operation position of the operation pedal 19 .

The operation pedal 19 is rotatably supported by a pair of leg portions 21B and 21C of a support member 21 extending toward the floor plate 6 at positions sandwiching the pilot valve 17 . A pair of legs 21B and 21C (first fixture 22 and second fixture 23) are attached to the mounting base 13 constituting the floor plate 6 when the operation pedal 19 is arranged at the front/rear operation position. The recessed grooves 14A, 14C, the fitting projections 15A, 15C, the engaging grooves 16A, 16C, and the pair of legs 21B, 21C (the first mounting fixture 22, the second A pair of recessed grooves 14B and 14D, fitting protrusions 15B and 15D, and engaging grooves 16B and 16D are provided to which the tool 23) is attached.

Accordingly, the operation pedal 19 can be fixed in the front/rear operation position by attaching the leg portions 21B and 21C to the recessed grooves 14A and 14C, the fitting projections 15A and 15C, and the engaging groove portions 16A and 16C. Further, the operation pedal 19 can be fixed in the left and right operation position by attaching the leg portions 21B and 21C to the recessed grooves 14B and 14D, the fitting protrusions 15B and 15D, and the engaging groove portions 16B and 16D.

Further, the front-rear operation mounting portion has engagement grooves 16A and 16C, and the left-right operation mounting portion has engagement grooves 16B and 16D. On this, the leg portions 21B and 21C are manually operated at the mounting position with respect to the front-rear operation mounting portion and the mounting position with respect to the left-right operation mounting portion, thereby engaging with the engagement groove portions 16A and 16C and fixing the fixing portion 22C. , 23C (engaging claws 22C2, 23C2). Therefore, the legs 21B and 21C of the operation pedal 19 can be easily attached and detached without using a screw tightening tool such as a wrench.

In the embodiment, the first fixture 22 inserts the fitting protrusion 15A of the mounting base 13 into the insertion hole 22B provided in the fitting body 22A, and the fixing part 22C is inserted into the engaging groove 16A provided in the fitting protrusion 15A. By engaging the engaging claws 22C2, it is attached to the mounting base 13. As shown in FIG. Also, the second fixture 23 is attached in the same manner. However, the present invention is not limited to this. For example, a threaded portion may be provided on the upper portion of the fitting protrusion, and a wing nut may be screwed onto the threaded portion to attach the fixture to the mounting base.

Further, in the embodiment, the case where the operation pedal devices 11 and 12 are provided on both left and right sides of the traveling lever/pedal device 10 is illustrated. However, the present invention is not limited to this, and the operation pedal device may be provided at only one of the left and right positions of the traveling lever/pedal device.

Furthermore, in the embodiment, the hydraulic excavator 1 including the crawler-type undercarriage 2 has been described as an example. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator equipped with a wheel-type undercarriage.

1 Hydraulic excavator (construction machinery)
2 Undercarriage (body)
3 Upper revolving body (body)
4 work device 6 floor board 7 driver's seat 13 mount (floor board)
14A, 14C Recessed groove (front/rear operation mounting portion)
14B, 14D recessed groove (left-right operation mounting part)
15A, 15C Fitting protrusions (front and rear operation mounting portions)
15B, 15D Fitting protrusions (right and left operation mounting parts)
16A, 16C Engagement groove portion (front-rear operation attachment portion, engagement portion)
16B, 16D Engagement groove portion (left/right operation attachment portion, engagement portion)
17 pilot valve 17D first pusher 17E second pusher 19 operation pedal 21B, 21C leg 22 first fixture (leg)
22C, 23C Fixed part 23 Second fixture (leg part)
D straight line (straight line connecting the first pusher and the second pusher)
F axis (rotational axis)

Claims (4)

a vehicle body provided with a working device;
a driver's seat provided on the floor plate of the vehicle body;
a pilot valve located on the front side of the driver's seat and provided on the floor plate for controlling supply and discharge of pilot pressure by pushing a first pusher and a second pusher;
an operation pedal that is rotatably provided above the pilot valve and presses the first pusher and the second pusher to operate the working device by being stepped on;
In a construction machine comprising
The operation pedal is arranged to extend in the front-rear direction, and has a front-rear operation position where the front side is depressed and a rear-side depression operation is performed. It is provided so that it can be switched between the left and right operation positions for performing the stepping operation and the right stepping operation for stepping on the right side,
The pilot valve is pushed by the first pusher by either the front stepping operation at the front/rear operation position of the operation pedal or the left stepping operation or the right stepping operation at the left/right operation position of the operation pedal. The second pusher is pushed by either the rear stepping operation at the front/rear operation position of the operation pedal or the left stepping operation or the right stepping operation at the left/right operation position of the operation pedal. A construction machine characterized by: In the construction machine according to claim 1,
A construction machine according to claim 1, wherein an axis of rotation when the operation pedal is stepped on is arranged at an angle inclined in a plan view with respect to a straight line connecting the first pusher and the second pusher. In the construction machine according to claim 1,
The operation pedal is rotatably supported by a pair of legs extending toward the floor plate at positions sandwiching the pilot valve,
The floor plate includes a pair of front/rear operation mounting portions to which the pair of leg portions are attached when the operation pedal is arranged at the front/rear operation position, and a pair of front/rear operation mounting portions when the operation pedal is arranged at the left/right operation position. A construction machine comprising a pair of left and right operation mounting portions to which legs are mounted. In the construction machine according to claim 3,
The front-rear operation mounting portion and the left-right operation mounting portion each have an engaging portion,
The pair of legs has a fixing portion that engages with and fixes to the engaging portion at a mounting position with respect to the front-rear operation mounting portion and a mounting position with respect to the lateral operation mounting portion. machine.

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