JP2013109582A - Operation pedal device of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation pedal device of a construction machine capable of easily changing a rotation direction of the operation pedal and reducing an installation space under a floor.SOLUTION: An operation pedal device 26 includes a foot-operated operation pedal 25, a pair of pushers 29A and 29B moving in the vertical direction according to the rotation on one side and the other side of the rotation direction of the operation pedal 25, and an operation signal output section 33 for generating and outputting a hydraulic operation signal according to the movements of the pushers 29A and 29B. The operation pedal device 26 further includes a first rotation mechanism 31 for rotatably supporting the operation pedal 25 in a longitudinal direction, a second rotation mechanism 32 for rotatably supporting the operation pedal 25 in a lateral direction and a lock pin 44 for selectively making any one of the rotation mechanism 31 and the rotation mechanism 32 non-rotatable. The pushers 29A and 29B are arrayed to have oblique directions in relation to the longitudinal direction and the lateral direction so that the pushers 29A and 29B move even when the operation pedal 25 rotates in either the longitudinal direction or the lateral direction.

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to an operation pedal device for a construction machine that outputs an operation signal in accordance with rotation of one side and the other side of a rotation direction of an operation pedal.

  A hydraulic excavator, which is one of the construction machines, is generally a lower traveling body that can be self-propelled, an upper revolving body that is turnably mounted on the lower traveling body, and can be raised and lowered on the upper revolving body (in other words, Multi-joint type work device that is provided in a vertically movable manner) and includes a boom, an arm, and an attachment (for example, a standard bucket), and a boom that pivots the boom, arm, and attachment in the vertical direction. A hydraulic cylinder, an arm hydraulic cylinder, an attachment rotating hydraulic cylinder, and the like are provided. On the left side of the driver's seat of this hydraulic excavator, for example, an operation having a manual operation lever for instructing to turn the arm by operating in the front-rear direction and instructing to turn the upper revolving body by operating in the left-right direction A lever device is provided. On the right side of the driver's seat, for example, an operation lever device having a manual operation lever for instructing the rotation of the boom by operating in the front-rear direction and instructing the rotation of the attachment by operating in the left-right direction is provided. ing. On the front side of the driver's seat, for example, an operation lever having left and right manual operation levers that operate in the front-rear direction to instruct the traveling of the lower traveling body and left and right foot-operated operation pedals that are linked to these A pedal device is provided.

  In addition, the excavator is equipped with an optional attachment crusher (crusher), breaker (crusher), mower (mower) or auger (digger) instead of the standard attachment bucket. It can be installed. An attachment drive hydraulic actuator is incorporated in an attachment such as a crusher or a breaker. Therefore, for example, an operation pedal device having a foot-operated operation pedal for instructing driving of the attachment is provided on the front side of the driver's seat and on the left side of the operation lever / pedal device for traveling described above.

  In the hydraulic excavator, the base end of the work device, that is, the base end of the boom is connected to the front side of the upper swing body via a swing post, and the swing post is rotated in the left-right direction (and thus the entire work device is One with a swinging hydraulic cylinder that swings in the direction is known. In such a swing-type hydraulic excavator, for example, an operation pedal having a foot-operated operation pedal for instructing the rotation of the swing post on the front side of the driver's seat and on the right side of the operation lever / pedal device for traveling described above. A device is provided.

  The hydraulic pilot type operation pedal device includes an operation pedal, a pair of pushes that move up and down in response to rotation of one side and the other side of the operation pedal, and movement of the pair of pushers. And a pair of pressure reducing valves that generate and output an operation pilot pressure (hydraulic operation signal). The pressure reducing valve has a valve body (spool) interlocked with the corresponding push, and the movement of the valve body reduces the original pressure from the pilot pump to generate the pilot pressure, and outputs the generated pilot pressure. It has become.

  Here, since the operation pedal device for driving the attachment described above instructs the drive of the crusher in the front-rear direction when the crusher is mounted as an optional attachment, for example, the rotation direction of the operation pedal is generally the vertical direction. It is preferable to provide (substantially in the front-rear direction). The swing pedal operating pedal device described above is generally provided so that the swinging direction of the operating pedal is lateral (substantially lateral) in order to instruct the swing post to rotate in the lateral direction. Is preferred. However, there are various preferences of the driver, and for example, there is a desire to unify the rotation direction of the operation pedal in the vertical direction or the horizontal direction. In addition, there is a demand for changing the rotation direction of the operation pedal in accordance with, for example, an attachment to be attached.

  Accordingly, in order to cope with this, for example, a hydraulic excavator has been proposed in which the rotation direction of the operation pedal can be changed by attaching and detaching the operation pedal device and changing its mounting position (see, for example, Patent Document 1). ). In the hydraulic excavator described in Patent Literature 1, a valve housing hole for housing a lower portion of the operation pedal device (specifically, a pilot valve including a pair of pressure reducing valves) is formed in the floor plate. In addition, a first mounting hole in which the operation pedal device can be mounted around the valve housing hole so that the rotation direction of the operation pedal is horizontal, and the rotation direction of the operation pedal is vertical. A second mounting hole is formed in which the operation pedal device can be mounted. And the rotation direction of an operation pedal can be changed by changing the attachment position of an operation pedal apparatus to the 1st attachment hole or the 2nd attachment hole.

Japanese Patent No. 4567241

  However, there are the following problems in the above-described prior art. That is, in the prior art described in Patent Document 1, when changing the rotation direction of the operation pedal, it is necessary to attach and detach the entire operation pedal device and change its mounting position, which is not easy. In particular, a plurality of pipes are connected to the pressure reducing valve of the operating pedal device, and the pipes need to be detached depending on the handling of the pipes. Further, since it is necessary to secure a space (including a dead space) to cope with the change in the arrangement of the pressure reducing valve, the installation space under the floor has been increased.

  An object of the present invention is to provide an operation pedal device for a construction machine that can easily change the rotation direction of the operation pedal and can reduce the installation space under the floor.

  (1) In order to achieve the above object, the present invention includes a foot-operated operation pedal, and a pair of pushers that move in the vertical direction in response to rotation of one side and the other side of the operation pedal. And an operation signal output unit that generates and outputs an operation signal according to the movement of the pair of pushers, wherein the operation pedal is rotated in one of a vertical direction and a horizontal direction. A first rotation mechanism that supports the first pedal; a second rotation mechanism that supports the operation pedal so as to be rotatable in the other direction of the vertical direction and the horizontal direction; the first rotation mechanism; Lock means for selectively disabling any one of the second rotating mechanisms, and the pair of pushers are configured such that the operation pedal is in a vertical direction or a horizontal direction. Longitudinal and horizontal so that it can move in any rotation Are arranged such that the direction oblique to the direction.

  In the present invention as described above, the operation of the operating pedal is controlled by selectively disabling either one of the first rotation mechanism and the second rotation mechanism by the lock means. The moving direction can be changed to the vertical direction or the horizontal direction. Therefore, the rotation direction of the operation pedal can be easily changed as compared with the case where the entire operation pedal device is attached and detached and the mounting position thereof is changed as in the prior art. Further, it is not necessary to change the arrangement of the operation signal output unit (specifically, for example, a pair of pressure reducing valves or a pair of potentiometers) located at the lower part of the operation pedal device, and a space for changing the arrangement (dead space) Therefore, it is possible to reduce the installation space under the floor.

  (2) In the above (1), preferably, the first rotation mechanism is provided on a lower side of the operation pedal, and extends in a direction orthogonal to the one direction; A first cylinder that rotatably supports the first shaft in the one direction, and the second rotation mechanism is joined to a lower side of the first cylinder and is opposed to the other direction. And a second shaft that extends in a direction orthogonal to each other and a second shaft that rotatably supports the second tube in the other direction.

  (3) In the above (2), preferably, the locking means includes a first shaft through hole penetrating in a radial direction of the first shaft and a first shaft penetrating in a radial direction of the first cylinder. A tube through hole, a second tube through hole penetrating in a radial direction of the second tube, a second shaft through hole penetrating in a radial direction through the second shaft, and the first shaft through hole. And a combination of the first cylinder through hole and a combination of the second cylinder through hole and the second shaft through hole are selectively inserted, and the first A lock pin that selectively disables the rotation mechanism of either the rotation mechanism or the second rotation mechanism.

  (4) In order to achieve the above object, the present invention includes a foot-operated operation pedal, and a pair of pushers that move in the vertical direction according to the rotation of one side and the other side of the operation pedal. And an operation signal output unit that generates and outputs an operation signal according to the movement of the pair of pushers, in an operation pedal device for a construction machine, a shaft insertion hole formed in a lower portion of the operation pedal, and the shaft insertion A shaft that is inserted into the hole and rotatably supports the operation pedal, and when the operation pedal is to be rotated in one of the vertical direction and the horizontal direction, the axis is orthogonal to the one direction. When the first bracket portion for mounting so as to extend in the direction to be rotated and the operation pedal are to be rotated in the other direction of the vertical direction and the horizontal direction, the axis is orthogonal to the other direction. For mounting to extend in the direction A pair of pushers, and the pair of pushers are inclined with respect to the vertical direction and the horizontal direction so as to move regardless of whether the operation pedal rotates in the vertical direction or the horizontal direction. Are arranged as follows.

  In the present invention, the rotation direction of the operation pedal can be changed to the vertical direction or the horizontal direction by detaching the operation pedal and the shaft and changing the mounting position thereof. Therefore, the rotation direction of the operation pedal can be easily changed as compared with the case where the entire operation pedal device is attached and detached and the mounting position thereof is changed as in the prior art. Further, it is not necessary to change the arrangement of the operation signal output unit (specifically, for example, a pair of pressure reducing valves or a pair of potentiometers) located at the lower part of the operation pedal device, and a space for changing the arrangement (dead space) Therefore, it is possible to reduce the installation space under the floor.

  According to the present invention, the rotation direction of the operation pedal can be easily changed, and the installation space under the floor can be reduced.

It is a side view showing the structure of the hydraulic shovel in the 1st Embodiment of this invention, and shows the state with which the crusher which is an attachment of optional equipment was mounted | worn. It is a top view showing the structure inside the cab of the hydraulic shovel in the 1st Embodiment of this invention. It is a hydraulic circuit diagram showing the principal part structure regarding the drive of a crusher and rotation of a swing post among the hydraulic drive devices of the hydraulic shovel in the 1st Embodiment of this invention. It is a top view showing the structure of the operation pedal apparatus in the 1st Embodiment of this invention, and shows the state which the 1st rotation mechanism was locked so that the rotation direction of the operation pedal might become a vertical direction. It is the side view seen from the arrow A direction in FIG. It is the side view seen from the arrow B direction in FIG. FIG. 6 is a cross-sectional view taken along a line CC in FIG. 5 and shows details of a state in which the first rotation mechanism is locked. It is sectional drawing in the cross section DD in FIG. It is a top view showing the structure of the operation pedal apparatus in the 1st Embodiment of this invention, and shows the state which the 2nd rotation mechanism was locked so that the rotation direction of the operation pedal might be a horizontal direction. It is the side view seen from the arrow E direction in FIG. It is the side view seen from the arrow F direction in FIG. It is sectional drawing in the cross section GG in FIG. 10, and shows the detail of the state in which the 2nd rotation mechanism was locked. It is sectional drawing in the cross section HH in FIG. It is a top view showing the structure in the driver's cab of the hydraulic shovel in the 2nd Embodiment of this invention, and shows the state in which the operation pedal was attached so that the rotation direction of an operation pedal may become a vertical direction. It is a top view showing the structure of the operation pedal apparatus in the 2nd Embodiment of this invention, and shows the state with which the operation pedal was attached so that the rotation direction of an operation pedal might become a vertical direction. It is the side view seen from the arrow I direction in FIG. It is the side view seen from the arrow J direction in FIG. It is sectional drawing in the cross section KK in FIG. It is a top view showing the structure in the driver's cab of the hydraulic shovel in the 2nd Embodiment of this invention, and shows the state in which the operation pedal was attached so that the rotation direction of an operation pedal might be a horizontal direction. It is a top view showing the structure of the operation pedal apparatus in the 2nd Embodiment of this invention, and shows the state with which the operation pedal was attached so that the rotation direction of an operation pedal might turn into a horizontal direction. It is the side view seen from the arrow L direction in FIG. It is the side view seen from the arrow M direction in FIG. It is sectional drawing in the cross section NN in FIG.

  A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a side view showing the structure of a hydraulic excavator in the present embodiment, and shows a state in which a crusher that is an optional attachment is mounted. FIG. 2 is a plan view showing the structure of the interior of the cab of the hydraulic excavator in the present embodiment. In the following, the driver's front side (left side in FIG. 1, upper side in FIG. 2), rear side (right side in FIG. 1, right side, FIG. 2) when the driver is seated in the driver's seat in the state shown in FIG. Middle down), left side (front side toward the paper surface in FIG. 1, left side in FIG. 2), right side (back side toward the paper surface in FIG. 1, right side in FIG. 2), simply front side, rear side, left side, Called the right side.

  1 and 2, the excavator includes a crawler type lower traveling body 1 that can be self-propelled, an upper revolving body 2 that is turnable on the lower traveling body 1, and an upper revolving body 2. A working device 4 connected to the front side via a swing post 3 is provided. This hydraulic excavator is a rear small turning type excavator (in other words, a hydraulic excavator having an operating mass of less than 6 tons), and the upper turning body 2 has a turning radius at the rear end thereof substantially equal to the width dimension of the lower traveling body 1. It is configured in a substantially circular shape as seen from above so as to be accommodated.

  The swing post 3 is provided on the front side of the upper swing body 2 so as to be rotatable in the left-right direction, and is rotated in the left-right direction by a swing hydraulic cylinder 5 (see FIG. 3 described later). Thereby, the working device 4 swings in the left-right direction.

  The work device 4 includes a boom 6 connected to the swing post 3 so as to be rotatable in the vertical direction, an arm 7 connected to the boom 6 so as to be rotatable in the vertical direction, and the arm 7 being turned up and down. And a crusher 8 that is an optional equipment attachment that is connected in a possible manner. The boom 6, the arm 7, and the crusher 8 are rotated in the vertical direction by a boom hydraulic cylinder 9, an arm hydraulic cylinder 10, and an attachment rotating hydraulic cylinder 11. A crusher driving hydraulic cylinder 12 (see FIG. 3 described later) is incorporated in the crusher 8, and the crusher 8 is opened and closed in the front-rear direction by the crusher driving hydraulic cylinder 12.

  The upper revolving unit 2 includes a revolving frame 13 that forms a lower basic structure thereof, a canopy type cab 14 provided on the front left side of the revolving frame 13, and a working device 4 provided on the rear side of the revolving frame 13. The counterweight 15 is provided to balance the balance. On the swivel frame 13, a prime mover 16 (see FIG. 3 described later), a hydraulic pump 17 (see FIG. 3 described later), a pilot pump 18 (see FIG. 3 described later), a fuel tank (not shown), and hydraulic oil A device such as a tank (not shown) is mounted and covered with an exterior cover 19 or the like.

  The cab 14 includes a floor frame 20 and a driver seat 21 on which a driver is seated. On the left side of the driver's seat 21, an operation lever device having a manual operation lever 22 </ b> L that instructs to turn the arm 7 by operating in the front-rear direction and instructs to turn the upper-part turning body 2 by operating in the left-right direction. Is provided. On the right side of the driver's seat 21, there is an operation lever device having a manual operation lever 22R that instructs the rotation of the boom 6 by operating in the front-rear direction and the rotation of the crusher 8 by operating in the left-right direction. Is provided. Further, on the front side of the driver's seat 21, left and right manually operated operation levers 23L and 23R for operating in the front-rear direction to instruct the traveling of the lower traveling body 1 and left and right foot-operated traveling operation pedals linked to these. An operating lever / pedal device having 24L and 24R is provided.

  Further, on the front side of the driver's seat 21 and on the left side of the traveling operation lever / pedal device described above, an operation pedal device 26L having a foot-operated operation pedal 25L for instructing driving of the crusher 8 is provided. An operation pedal device 26R having a foot-operated operation pedal 25R for instructing the rotation of the swing post 3 is provided on the front side of the driver seat 21 and on the right side of the above-described operation lever / pedal device for traveling. Yes.

  The lower traveling body 1, the upper swing body 2, the swing post 3, the boom 6, the arm 7, the crusher 8, and the like described above are operated by a hydraulic drive device provided in the hydraulic excavator.

  FIG. 3 is a hydraulic circuit diagram showing a main part configuration related to driving of the crusher 8 and rotation of the swing post 3 in the hydraulic drive device of the hydraulic excavator.

  In FIG. 3, a hydraulic pump 17 and a pilot pump 18 driven by a prime mover 16 (specifically, for example, an engine or an electric motor), a crusher driving hydraulic cylinder 12 driven by pressure oil from the hydraulic pump 17 and a swing hydraulic pressure. The cylinder 5, the attachment drive direction switching valve 27 for controlling the flow of pressure oil from the hydraulic pump 17 to the crusher drive hydraulic cylinder 12, and the flow of pressure oil from the hydraulic pump 17 to the swing hydraulic cylinder 5 are controlled. An operation pedal device 26L having a swing direction switching valve 28, a foot-operated operation pedal 25L instructing driving of the crusher 8, and an operation pedal device 26R having a foot-operating pedal 25R instructing rotation of the swing post 3; Is provided.

  The operation pedal device 26L includes the above-described operation pedal 25L, a pair of pushers 29LA and 29LB that move in the vertical direction according to the rotation of one side and the other side of the operation pedal 25L, and the pushers 29LA and 29LB. And a pair of pressure reducing valves 30LA and 30LB that generate and output a hydraulic operation signal in accordance with the movement of the valve. The pressure reducing valve 30LA has a valve body (spool) interlocked with the pusher 29LA, and the movement of this valve body reduces the original pressure from the pilot pump 18 to generate a pilot pressure (hydraulic operation signal). The pilot pressure is output to the pressure receiving portion 27a of the attachment drive direction switching valve 27. As a result, the attachment drive direction switching valve 27 is switched to the operation position on the left side in the figure, and the crusher drive hydraulic cylinder 12 is driven to extend. The pressure reducing valve 30LB has a valve body (spool) interlocked with the pusher 29LB. By moving the valve body, the original pressure from the pilot pump 18 is reduced to generate a pilot pressure (hydraulic operation signal). The pilot pressure is output to the pressure receiving portion 27 b of the attachment drive direction switching valve 27. As a result, the attachment drive direction switching valve 27 is switched to the operation position on the right side in the figure, and the crusher drive hydraulic cylinder 12 is driven to contract.

  Similarly, the operation pedal device 26R includes the above-described operation pedal 25R, a pair of pushers 29RA and 29RB that move in the vertical direction in accordance with the rotation of one side and the other side of the operation pedal 25R, and these pushers. It has a pair of pressure reducing valves 30RA and 30RB that generate and output hydraulic operation signals according to the movement of 29RA and 29RB. The pressure reducing valve 30RA has a valve body (spool) interlocked with the pusher 29RA. The movement of the valve body reduces the original pressure from the pilot pump 18 to generate a pilot pressure (hydraulic operation signal). The pilot pressure is output to the pressure receiving portion 28 a of the swing direction switching valve 28. As a result, the swing direction switching valve 28 is switched to the operating position on the left side in the drawing, and the swing hydraulic cylinder 5 is driven to extend. The pressure reducing valve 30RB has a valve body (spool) that is linked to the pusher 29RB. By moving the valve body, the original pressure from the pilot pump 18 is reduced to generate a pilot pressure (hydraulic operation signal). The pilot pressure is output to the pressure receiving portion 28 b of the swing direction switching valve 28. As a result, the swing direction switching valve 28 is switched to the operating position on the right side in the figure, and the swing hydraulic cylinder 5 is driven to be contracted.

  Here, as a feature of the present embodiment, the operation pedal devices 26L and 26R can change the rotation direction of the operation pedals 25L and 25R to the vertical direction (front-rear direction) or the horizontal direction (left-right direction). The structure of such operation pedal devices 26L and 26R will be described below. Hereinafter, for convenience, the operation pedal 25L or 25R is referred to as an operation pedal 25, the operation pedal device 26L or 26R is referred to as an operation pedal device 26, and the pair of pushers 29LA and 29LB or the pair of pushers 29RA and 29RB is a pair of pushers 29A. 29B, and the pair of pressure reducing valves 30LA and 30LB or the pair of pressure reducing valves 30RA and 30RB are referred to as a pair of pressure reducing valves 30A and 30B.

  FIG. 4 is a top view showing the structure of the operation pedal device 26 in the present embodiment, and shows a state where a first rotation mechanism, which will be described later, is locked so that the rotation direction of the operation pedal 25 is the vertical direction. . 5 is a side view seen from the direction of arrow A in FIG. 4, and FIG. 6 is a side view seen from the direction of arrow B in FIG. 4 (however, for convenience, bolts are not shown). FIG. 7 is a cross-sectional view taken along a line CC in FIG. 5 and shows details of a state in which the first rotation mechanism is locked. 8 is a cross-sectional view taken along a line DD in FIG.

  Similarly, FIG. 9 is a top view showing the structure of the operation pedal device 26 in the present embodiment, and the second rotation mechanism described later is locked so that the rotation direction of the operation pedal 25 is the horizontal direction. Indicates the state. 10 is a side view as seen from the direction of arrow E in FIG. 9, and FIG. 11 is a side view as seen from the direction of arrow F in FIG. 9 (however, for convenience, bolts are not shown). FIG. 12 is a cross-sectional view taken along the section GG in FIG. 10 and shows details of a state in which the second rotation mechanism is locked. FIG. 13 is a sectional view taken along a section HH in FIG.

  4 to 13, the operation pedal device 26 is provided on the operation pedal 25 described above and on the lower side of the operation pedal 25, and the operation pedal 25 is moved in the lateral direction (FIGS. 4 and 9 and FIG. 2 described above). A first rotation mechanism 31 that is supported so as to be rotatable in the middle and left and right directions, and a lower side of the first rotation mechanism 31. The operation pedal 25 is vertically moved via the first rotation mechanism 31. The second rotation mechanism 32 that supports the rotation in the direction (the front-rear direction in FIGS. 4 and 9 and the above-described FIG. 2), and the second rotation mechanism 32 is provided below the second rotation mechanism 32 and described above. An operation signal output unit 33 including a pair of pressure reducing valves 30A and 30B and the pair of pushers 29A and 29B described above are included. The operation pedal 25 is a substantially square plate, and the lower surface is tapered so that the thickness gradually increases from the outer edge toward the center.

  The operation signal output unit 33 is formed in a substantially rectangular parallelepiped shape, and a flange plate 34 is provided on the upper side thereof. The flange plate 34 is a portion that is fixed to the floor frame 20 using a plurality of (four in this embodiment) bolts 35, and the operation signal output unit 33 is positioned below the floor (see FIG. 5 and FIG. 5). (See FIG. 10).

  The pushers 29A and 29B are disposed so as to penetrate the flange plate 34. Further, the pushers 29A and 29B are inclined with respect to the vertical direction and the horizontal direction (for example, a direction of 45 degrees) so that the pusher 29A moves even when the operation pedal 25 rotates in either the vertical direction or the horizontal direction. It is arranged so that As a result, the pusher 29A moves downward according to the rotation of one side (front side) in the vertical direction of the operation pedal 25 or one side (left side) in the horizontal direction, and the valve body of the pressure reducing valve 30A is moved by the movement. It is supposed to move. The pusher 30B moves downward in accordance with the rotation of the other side (rear side) in the vertical direction or the other side (right side) in the horizontal direction of the operation pedal 25, and the valve body of the pressure reducing valve 30B is moved by the movement. It is supposed to move. The pressure reducing valves 30A and 30B constituting the operation signal output unit 33 are also arranged in an oblique direction, like the pushers 29A and 29B. Therefore, the operation signal output unit 33 is disposed so that the width direction thereof is an oblique direction (see FIGS. 7 and 12).

  The first rotation mechanism 31 is provided on the lower surface side of the operation pedal 25, and a pair of upper bracket portions 36A and 36B spaced apart in the vertical direction (in other words, the direction orthogonal to the horizontal direction), and the upper side thereof. The first cylinder 37 disposed so as to extend in the vertical direction between the bracket parts 36A and 36B, the shaft insertion hole of the upper bracket part 36A, the first cylinder 37, and the shaft insertion hole of the upper bracket part 36B And a first shaft 38 that passes through. On one end side of the first shaft 38, a large-diameter portion 38a having a larger diameter than the shaft insertion hole of the upper bracket portion 36A is formed. A pin insertion hole is formed on the other end side of the first shaft 38, and a retaining pin 39 is inserted into the pin insertion hole so that the first shaft 38 is retained. Further, the large-diameter portion 38a of the first shaft 38 is cut out at a part in the circumferential direction (specifically, the upper portion), and the cut-out portion and the stopper portion 40 provided on the upper bracket portion 36A are fitted. Match. As a result, the relative rotation between the first shaft 38 and the upper bracket portion 36A is stopped, and the first shaft 38, the upper bracket portions 36A and 36B, and the operation pedal 25 rotate with respect to the first cylinder 37. It comes to move. Therefore, the 1st rotation mechanism 31 supports the operation pedal 25 so that rotation is possible to a horizontal direction.

  The second rotation mechanism 32 is provided on the upper side of the flange plate 34, and a pair of lower bracket portions 41A and 41B spaced apart in the horizontal direction (in other words, the direction orthogonal to the vertical direction), and these lower sides The second cylinder 42 disposed so as to extend in the lateral direction between the bracket parts 41A and 41B and joined to the lower side of the first cylinder 37 by welding or the like, and the shaft of the lower bracket part 41A It is comprised with the 2nd axis | shaft 43 which penetrates the shaft insertion hole of the insertion hole, the 2nd cylinder | tube 42, and the lower bracket part 41B. On one end side of the second shaft 43, a large-diameter portion 43a having a larger diameter than the shaft insertion hole of the lower bracket portion 41A is formed. A pin insertion hole is formed on the other end side of the second shaft 43, and a retaining pin 39 is inserted into the pin insertion hole so that the second shaft 43 is prevented from being removed. Further, the large-diameter portion 44a of the second shaft 44 is cut out at a portion in the circumferential direction (specifically, the lower portion), and this cut-out portion and the stopper portion 40 provided on the lower bracket portion 41A, Are mated. As a result, the relative rotation between the second shaft 44 and the lower bracket portion 41A is stopped, and the second cylinder 42 and the first rotation with respect to the lower bracket portions 41A and 41B and the second shaft 43 are stopped. The moving mechanism 31 and the operation pedal 25 are configured to rotate. Therefore, the second rotation mechanism 32 is configured to support the operation pedal 25 so as to be rotatable in the vertical direction.

  The first cylinder 37 is formed with a first cylinder through hole 37a penetrating in the radial direction, and the first shaft 38 is formed in a radial direction at a position corresponding to the first cylinder through hole 37a. A first shaft through hole 38b that penetrates is formed. Then, as shown in FIG. 7 and the like, when the lock pin 44 is inserted through the first cylinder through hole 37a and the first shaft through hole 38b, the first rotation mechanism 31 is unable to rotate. Similarly, the second cylinder 42 is formed with a second cylinder through hole 42a penetrating in the radial direction, and the second shaft 43 has a position corresponding to the second cylinder through hole 42a. A second shaft through hole 43b penetrating in the radial direction is formed. Then, as shown in FIG. 12 and the like, when the lock pin 44 is inserted into the second cylinder through hole 42a and the second shaft through hole 43b, the second rotation mechanism 32 becomes unrotatable. A large diameter portion 44a is formed on one end side of the lock pin 44, and a pin insertion hole is formed on the other end side. The lock pin 44 is prevented from being pulled out by inserting the locking retaining pin 45 into the pin insertion hole.

  In this embodiment, one of the combination of the first shaft through hole 37a and the first tube through hole 38b and the combination of the second tube through hole 42a and the second shaft through hole 43b. By selecting the combination and inserting the lock pin 44, one of the first rotation mechanism 31 and the second rotation mechanism 32 is selectively made unrotatable.

  For example, when the first turning mechanism 31 is selectively made unrotatable, the operation pedal 25 can be turned in the vertical direction by the second turning mechanism 32. At this time, for example, when the operation pedal 25 is operated to the front side, the pusher 29A moves downward, and the pressure reducing valve 30A generates and outputs a pilot pressure accordingly. On the other hand, for example, when the operation pedal 25 is operated to the rear side, the pusher 29B moves downward, and the pressure reducing valve 30B generates and outputs a pilot pressure accordingly.

  For example, when the second rotation mechanism 32 is selectively made unrotatable, the operation pedal 25 can be rotated in the lateral direction by the first rotation mechanism 31. At this time, for example, when the operation pedal 25 is operated to the left side, the pusher 29A moves downward, and the pressure reducing valve 30A generates and outputs a pilot pressure accordingly. On the other hand, for example, when the operation pedal 25 is operated to the right side, the pusher 29B moves downward, and the pressure reducing valve 30B generates and outputs a pilot pressure accordingly.

  Thus, in this embodiment, the rotation direction of the operation pedal 25 can be changed to the vertical direction or the horizontal direction by removing the lock pin 40 and changing the mounting position. Therefore, the rotation direction of the operation pedal 25 can be easily changed as compared with the case where the entire operation pedal device is detached and the attachment position thereof is changed as in the prior art. In particular, it is not necessary to change the arrangement of the operation signal output unit 33 of the operation pedal device 26, and it is not necessary to attach or detach the pipe connected to the operation signal output unit 33. Therefore, the rotation direction of the operation pedal 25 is easy. Can be changed. In addition, it is not necessary to change the arrangement of the operation signal output unit 34 located below the operation pedal device 26, and it is not necessary to secure a space (including a dead space) for changing the arrangement under the floor. The installation space can be reduced.

  In the first embodiment, the first rotation mechanism 31 provided on the lower side of the operation pedal 25 supports the operation pedal 25 so as to be able to rotate in the lateral direction. The second rotation mechanism 32 provided on the lower side of the mechanism 31 has been described by taking as an example a structure that supports the operation pedal 25 so as to be rotatable in the vertical direction, but is not limited thereto. That is, the first rotation mechanism provided below the operation pedal 25 supports the operation pedal 25 so as to be rotatable in the vertical direction, and the second rotation mechanism provided below the first rotation mechanism. The pivot mechanism may be configured to support the operation pedal 25 so as to be pivotable in the lateral direction. In this case, the same effect as described above can be obtained.

  A second embodiment of the present invention will be described with reference to FIGS. Note that in this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. For convenience, the operation pedal 25L or 25R is referred to as an operation pedal 25A, and the operation pedal device 26L or 26R is referred to as an operation pedal device 26A.

  FIG. 14 is a plan view showing the structure of the hydraulic excavator in the cab in the present embodiment, and FIG. 15 is a plan view showing the structure of the operating pedal device in the present embodiment. FIG. 14 and FIG. The state where the operation pedal is attached so that the rotation direction of the operation pedal is the vertical direction is shown. 16 is a side view as seen from the direction of arrow I in FIG. 15, and FIG. 17 is a side view as seen from the direction of arrow J in FIG. 15 (however, for convenience, bolts are not shown). 18 is a cross-sectional view taken along a cross section KK in FIG.

  Similarly, FIG. 19 is a plan view illustrating the structure of the hydraulic excavator in the cab in the present embodiment, and FIG. 20 is a plan view illustrating the structure of the operating pedal device in the present embodiment. Reference numeral 20 denotes a state where the operation pedal is attached so that the rotation direction of the operation pedal is the horizontal direction. 21 is a side view seen from the direction of arrow L in FIG. 20, and FIG. 22 is a side view seen from the direction of arrow M in FIG. 20 (however, the bolt is not shown for convenience). 23 is a cross-sectional view taken along a cross section NN in FIG.

  In the present embodiment, the operation pedal device 26A has an operation pedal 25A, a shaft 46 that rotatably supports the operation pedal 25A, and a shaft 46 that moves in the horizontal direction when it is desired to rotate the operation pedal 26A in the vertical direction. In other words, when the pair of first bracket portions 47A and 47B for mounting so as to extend in the direction perpendicular to the vertical direction and the operation pedal 25A are to be rotated in the horizontal direction, the shaft 46 is A pair of second bracket portions 48A, 48B for mounting so as to extend in the vertical direction (in other words, a direction orthogonal to the horizontal direction), an operation signal output portion 33, and a pair of pushers 29A, 29B Have.

  The operation pedal 25A is provided with a substantially rectangular plate portion 49, a substantially square columnar support portion 50 projecting downward from the center of the plate portion 49, and a lower portion of the support portion 50. 49 is formed of a substantially cylindrical tube portion 51 extending in a short direction (in other words, a direction orthogonal to the longitudinal direction), and a shaft insertion hole 51a through which a shaft 46 is inserted. Is formed. The lower surface side of the plate portion 49 is formed in a tapered shape so that the thickness gradually increases from both ends in the longitudinal direction toward the center.

  The first bracket portions 47A and 47B are provided on the upper side of the flange plate 34 and are spaced apart from each other in the lateral direction. Then, in a state where the extending direction of the cylinder portion 51 of the operation pedal 25A is the horizontal direction (in other words, in a state where the longitudinal direction of the plate portion 49 of the operation pedal 25A is the vertical direction), the cylinder portion 51 of the operation pedal 25A. Can be disposed between the first bracket portions 47A and 47B. The shaft 46 can be inserted into the shaft insertion hole of the first bracket portion 47A, the shaft insertion hole 51a of the cylinder portion 51 of the operation pedal 25A, and the shaft insertion hole of the first bracket portion 47B. Therefore, the first bracket portions 47A and 47B can be attached so that the shaft 46 extends in the lateral direction.

  The second bracket portions 48A and 48B are provided on the upper side of the flange plate 34 and are separated from each other in the vertical direction. Then, in a state where the extending direction of the cylinder portion 51 of the operation pedal 25A is the vertical direction (in other words, in a state where the longitudinal direction of the plate portion 49 of the operation pedal 25A is the horizontal direction), the cylinder portion 51 of the operation pedal 25A. Can be disposed between the second bracket portions 48A and 48B. The shaft 46 can be inserted into the shaft insertion hole of the second bracket portion 48A, the shaft insertion hole 51a of the cylinder portion 51 of the operation pedal 25A, and the shaft insertion hole of the second bracket portion 48B. That is, the first bracket portions 48A and 48B can be attached so that the shaft 46 extends in the vertical direction.

  A large-diameter portion 46a having a larger diameter than the shaft insertion hole of the bracket portion is formed on one end side of the shaft 46. A retaining ring 52 is attached to the other end of the shaft 46 so that the shaft 46 is prevented from being pulled out.

  In the present embodiment configured as described above, the rotation direction of the operation pedal 25 can be changed to the vertical direction or the horizontal direction by detaching the operation pedal 25A and the shaft 46 and changing the mounting position thereof. . Therefore, the rotation direction of the operation pedal 25 </ b> A can be easily changed as compared with the case where the entire operation pedal device is detached and the mounting position thereof is changed as in the prior art. In particular, it is not necessary to change the arrangement of the operation signal output unit 33 of the operation pedal device 26A, and it is not necessary to attach or detach the pipe connected to the operation signal output unit 33. Therefore, the rotation direction of the operation pedal 25A can be easily performed. Can be changed. In addition, it is not necessary to change the arrangement of the operation signal output unit 34 located below the operation pedal device 26A, and it is not necessary to secure a space (including a dead space) for changing the arrangement under the floor. The installation space can be reduced.

  In the first and second embodiments, the operation pedal devices 26L and 26R are arranged such that, for example, when the rotation direction of the operation pedals 25L and 25R is the vertical direction, the rotation direction is the front-rear direction. However, the present invention is not limited to this. That is, for example, when the rotation direction of the operation pedals 25L and 25R is set to the vertical direction so that the driver sitting on the driver seat 21 can easily step on, the rotation direction of the operation pedals 25L and 25R and the driver seat The operation pedal devices 26 </ b> L and 26 </ b> R may be arranged so as to be connected to the center of 21. In this case, the same effect as described above can be obtained.

  In the first and second embodiments, the description has been given by taking as an example the case where the operation pedal device is a hydraulic pilot type operation pedal, and the operation signal output unit 33 is configured by a pair of pressure reducing valves. Alternatively, an electric lever type operation pedal device may be used. That is, the operation signal output unit may include a pair of potentiometers that detect the displacement of the pair of pushers and generate and output a corresponding electric operation signal. Also in such a modification, the same effect as the above embodiment can be obtained.

  In the above, as an application object of the present invention, the swing type hydraulic excavator, that is, the operation pedal device 26L for instructing the drive of the attachment such as the crusher 8 and the operation pedal device 26R for instructing the rotation of the swing post 3 are provided. Although the description has been given by taking the hydraulic excavator provided as an example, it is not limited thereto. That is, for example, the present invention may be applied to an offset hydraulic excavator that includes a lower boom and an upper boom, and includes an offset hydraulic cylinder that rotates the upper boom in the left-right direction with respect to the lower boom. That is, you may apply to the hydraulic shovel provided with the operation pedal apparatus which instruct | indicates the drive of attachments, such as the crusher 8, and the operation pedal apparatus which instruct | indicates rotation of an upper boom. Any construction machine provided with an operation pedal device may be used, and the construction machine may be applied to other construction machines other than the hydraulic excavator.

25, 25A, 25L, 25R Operation pedal 26, 26A, 26L, 26R Operation pedal device 29A, 29B, 29LA, 29LB, 29RA, 29RB Pusher 31 First rotation mechanism 32 Second rotation mechanism 33 Operation signal output unit 37 1st cylinder 37a 1st cylinder through-hole (locking means)
38 1st axis | shaft 38b 1st axis | shaft through-hole (locking means)
42 2nd cylinder 42a 2nd cylinder through-hole (locking means)
43 2nd shaft 43b 2nd shaft through hole (locking means)
44 Lock pin (locking means)
46 shaft 47A, 47B first bracket part 48A, 48B second bracket part

Claims (4)

A foot-operated operation pedal, a pair of pushers that move up and down according to the rotation of one side and the other side of the operation pedal, and an operation signal generated according to the movement of the pair of pushers In an operation pedal device of a construction machine having an operation signal output unit that outputs
A first rotation mechanism that supports the operation pedal so as to be rotatable in one of a vertical direction and a horizontal direction;
A second rotation mechanism that supports the operation pedal so as to be rotatable in the other direction of the vertical direction and the horizontal direction;
Lock means for selectively disabling one of the first rotation mechanism and the second rotation mechanism;
The pair of pushers are arranged so as to be inclined with respect to the vertical direction and the horizontal direction so as to move regardless of whether the operation pedal rotates in the vertical direction or the horizontal direction. Operation pedal device for construction machinery. The operation pedal device for a construction machine according to claim 1,
The first rotation mechanism includes:
A first shaft provided below the operation pedal and extending in a direction perpendicular to the one direction;
A first tube that rotatably supports the first shaft in the one direction;
The second rotation mechanism includes:
A second cylinder joined to the lower side of the first cylinder and extending in a direction orthogonal to the other direction;
An operation pedal device for a construction machine, comprising: a second shaft that rotatably supports the second cylinder in the other direction. The operation pedal device for a construction machine according to claim 2,
The locking means is
A first shaft through hole penetrating in a radial direction of the first shaft;
A first tube through hole penetrating in a radial direction of the first tube;
A second cylinder through hole penetrating in a radial direction of the second cylinder;
A second shaft through hole penetrating radially through the second shaft;
One of the combination of the first shaft through hole and the first tube through hole and the combination of the second tube through hole and the second shaft through hole is selectively inserted. A construction machine comprising a lock pin that selectively disables rotation of one of the first rotation mechanism and the second rotation mechanism. Operation pedal device. A foot-operated operation pedal, a pair of pushers that move up and down according to the rotation of one side and the other side of the operation pedal, and an operation signal generated according to the movement of the pair of pushers In an operation pedal device of a construction machine having an operation signal output unit that outputs
A shaft insertion hole formed in a lower portion of the operation pedal;
A shaft that is inserted through the shaft insertion hole and rotatably supports the operation pedal;
A first bracket portion for attaching the shaft so as to extend in a direction orthogonal to the one direction when the operation pedal is to be rotated in one of a vertical direction and a horizontal direction;
A second bracket portion for attaching the shaft so as to extend in a direction orthogonal to the other direction when the operation pedal is to be rotated in the other direction of the vertical direction and the horizontal direction; And
The pair of pushers are arranged so as to be inclined with respect to the vertical direction and the horizontal direction so as to move regardless of whether the operation pedal rotates in the vertical direction or the horizontal direction. Operation pedal device for construction machinery.

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