JP5275289B2 - Construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction machine allowing respective operations of a revolution speed indicator and an automatic idle switch without practically moving the operator's line of sight in the machine that has a mechanical operation system as an operation device used for a working device allowing operation of an attachment. <P>SOLUTION: The mini-shovel equipment includes: a working device-use operation device 13 that is disposed for enabling operation of an attachment included in a working device 3 and that is included in a mechanical operation system; an engine control dial 15 for instructing the number of revolutions of an engine; an automatic idle control system for controlling the engine so as to reduce the number of revolutions from a previously set number of revolutions to a predetermined low number thereof (low idling) when the working device-use operation device 13 is moved from an operating position back to a neutral position; and an automatic idle switch for switching over between validity and invalidity of an automatic idle control. The engine control dial 15 is provided with the automatic idle switch. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a construction machine such as a mini excavator provided with an operation device for a work device that is provided so as to be able to operate an attachment included in the work device and is included in a mechanical operation system, and an auto idle control system.

  As shown in Patent Document 1, in the construction machine, from the state where the engine is driven at a set rotational speed and the actuator is operated by operating the operating device for the working device to perform a desired work, For example, when the operating device for the working device is returned to the neutral position to stop the work and the actuator is stopped, the engine speed is automatically changed from the preset speed to the predetermined low speed (low idle). There is known an auto-idle control system for reducing the speed to a minimum. Note that Patent Document 1 discloses a changeover switch for switching between the above-described auto-idle control between valid and invalid. When the switch is switched so that the auto idle control is enabled, the above-described auto idle control is executed. When the switch is switched so that the auto idle control is disabled, the above-described auto idle control is performed. Even if the operation device operating device is not returned to the neutral position, the engine rotation speed is continuously maintained at the set rotation speed.

  In general, when the construction machine model is relatively large and the actuator operating device can be configured with a pilot valve included in the hydraulic operating system, the hydraulic pressure of the hydraulic operating system is detected by a sensor or the like during auto-idle control. By doing so, the engine speed is reduced from the set speed to a predetermined low speed (low idle). That is, when the hydraulic pressure of the hydraulic operation system detected by a sensor or the like with the operation of the pilot valve exceeds a threshold value, the engine speed is automatically increased from a predetermined low speed (low idle) to a set speed. On the contrary, when the hydraulic pressure of the hydraulic operation system detected by the sensor or the like becomes smaller than the threshold value, the engine speed is automatically decreased from the set speed to a predetermined low speed (low idle). Yes.

  On the other hand, in a small machine such as a 1 to 2 class mini excavator, an operation device for a working device capable of operating an attachment attached instead of a bucket is configured with a mechanical operation system. It is. In order to perform auto-idle control completely automatically, a hydraulic operation system using a work valve operating device as a pilot valve as in the above-mentioned relatively large model is provided, and a sensor for detecting oil pressure is also provided. However, in the 1 and 2t class small machines, the installation space for installing the pilot valve is not enough, and there are restrictions due to the manufacturing cost. I must.

  In a small machine having such a mechanical operation system, for example, a mini excavator, the engine speed is reduced when a predetermined time elapses after the operating device operating device for operating the attachment is returned to the neutral position. In addition, an auto idle control system that reduces the preset rotational speed (high idle) to a predetermined low rotational speed (low idle) is employed. In addition, an auto idle switch that switches between enabling and disabling of the auto idle control is provided, and when the work is started again from the paused state, the engine speed does not increase if the auto idle control remains valid. Therefore, the switching operation of the auto idle switch is performed so that the auto idle control is once invalidated. As a result, the engine speed increases from a predetermined low speed (low idle) to a set speed. Therefore, by operating the operating device for the working device, the attachment is driven and a desired work can be performed. Thereafter, when the auto idle switch is switched so as to enable the auto idle control, as described above, the engine rotation is performed when a predetermined time has elapsed after the operating device operating device is returned to the neutral position. The number decreases from the preset rotation speed (high idle) to a predetermined low rotation speed (low idle).

  Further, as described above, in a small machine such as a mini excavator having a mechanical operation system in which the operating device for an operation device capable of operating an attachment is used, as shown in FIGS. A box 42 is disposed in the vicinity of the driver's seat 41 provided in the vehicle, and a work device operating device 43 is provided in the box 42. The box 42 is provided with an engine key switch 44 and a speed indicator for indicating the engine speed, for example, an engine control dial 45. A blade operating device 46 for operating the blade is provided at the right side of the box 42. ing. In addition, a control panel 47 capable of displaying various information such as drive information is provided at a front position away from the work device operation device 43, and the above-described auto idle switch 50 is provided on the control panel 47. Yes.

Japanese Patent Publication No. 60-38561

  As described above, in a small machine such as a mini excavator equipped with a mechanical operation system and an auto idle control system corresponding to the mechanical operation system, as shown in FIGS. The engine control dial 45 and the auto idle switch 50 are arranged at positions separated from each other so as to sandwich the work device operating device 43 and the like. Therefore, an operator who sits in the driver's seat 41 and appropriately operates the engine control dial 45 and the auto idle switch 50 moves his / her eyes to each of two distant places and visually confirms the engine control dial 45, Alternatively, the auto idle switch 50 must be operated, which is complicated. That is, in this type of prior art, it is easy to give the operator a feeling of fatigue when carrying out the auto idle control, and the operability related to the auto idle control tends to deteriorate.

  The present invention has been made from the above-described actual state of the prior art, and its purpose is to provide a mechanical operation system as an operation device for a working device capable of operating an attachment, and a rotation speed indicator and An object of the present invention is to provide a construction machine in which an operator can operate these auto-idle switches without moving their eyes.

  In order to achieve this object, the present invention provides an operation for a work device that is disposed in the vicinity of a driver's seat provided on a revolving structure and that can operate an attachment included in the work device and is included in a mechanical operation system. When the device, the engine speed indicator for instructing the engine speed, and the operation device operating device are returned from the operating position to the neutral position, the engine speed is reduced from the set rotational speed up to a predetermined low speed. An auto idle control system that performs control to reduce the auto idle control, and a construction machine having an auto idle switch that switches between enabling and disabling the auto idle control, the auto idle switch is provided at the rotation speed indicator position. It is characterized by that.

  The present invention configured as described above is provided with an operation device for a work device that is provided so that the attachment can be operated and is included in a mechanical operation system, and the auto idle switch is set to the rotation speed indicator position, that is, the rotation Since the number indicator and the auto idle switch are provided at substantially the same position, the operator sitting in the driver's seat hardly moves his eyes when operating the speed indicator and when operating the auto idle switch. These can be manipulated. Thereby, the feeling of fatigue given to the operator along with the operation of the rotation speed indicator and the auto idle switch can be reduced.

  Further, according to the present invention, in the above invention, the construction machine is a mini excavator, the rotation speed indicator has a rotation knob, and sets the rotation speed of the engine according to the rotation amount of the rotation knob. The auto idle switch is composed of an engine control dial, and the auto idle switch is a switch that switches between enabling and disabling the auto idle control in response to a pressing operation of the engine control dial on the rotating knob or a rotating operation of the rotating knob. It is characterized by that.

  According to the present invention configured as described above, when an operator sitting in the driver's seat of a mini excavator presses the turning knob of the engine control dial or turns the turning knob of the engine control dial. Therefore, the auto idle control can be easily switched between valid and invalid.

  Further, according to the present invention, in the above invention, the construction machine is a mini excavator, the rotation speed indicator has a rotation knob, and sets the rotation speed of the engine according to the rotation amount of the rotation knob. It comprises an engine control dial, and the auto idle switch is provided on the rotating knob of the engine control dial.

  According to the present invention configured as described above, the operator sitting in the driver's seat of the mini excavator can easily switch the auto idle control between valid and invalid by operating the auto idle switch on the rotary knob of the engine control dial. Can do.

  Further, according to the present invention, in the above invention, the construction machine is composed of a mini excavator, the rotational speed indicator is composed of a throttle lever for setting the rotational speed of the engine according to the swing operation amount, and the auto idle switch is And provided on the grip of the throttle lever.

  According to the present invention configured as described above, the operator sitting in the driver's seat of the mini excavator can easily switch the validity / invalidity of the automatic idle control by operating the automatic idle switch on the grip of the throttle lever.

  The present invention relates to an operating device for a working device that is provided so that an attachment can be operated and is included in a mechanical operating system, a rotational speed indicator that indicates the rotational speed of an engine, and an auto idle switch that switches auto idle control between valid and invalid Since the auto idle switch is provided at the speed indicator position, the operator sitting in the driver's seat looks at the speed indicator and the auto idle switch respectively. You can manipulate them with little or no shift. Thereby, the feeling of fatigue given to the operator along with the operation of the rotation speed indicator and the auto idle switch can be reduced as compared with the prior art. Therefore, in the apparatus provided with the work device operation device included in the mechanical operation system so that the attachment can be operated, the operability of the auto idle control can be improved as compared with the conventional one.

It is a side view which shows the mini excavator which comprises 1st Embodiment of the construction machine which concerns on this invention. It is a figure which shows the principal part structure of 1st Embodiment, and is a perspective view which shows the state of an engine control dial when an auto idle switch is OFF. It is a figure which shows the principal part structure of 1st Embodiment, and is a perspective view which shows the state of an engine control dial when an auto idle switch is ON. It is a perspective view which shows the principal part structure of 2nd Embodiment of the construction machine which concerns on this invention. It is the figure which expanded and showed the engine control dial with which 2nd Embodiment is equipped. It is a perspective view which shows the principal part structure of 3rd Embodiment of the construction machine which concerns on this invention. It is a perspective view which shows the principal part structure of 4th Embodiment of the construction machine which concerns on this invention. It is the front view which expanded and showed the throttle lever with which 4th Embodiment is equipped. It is a perspective view which shows the principal part structure of the conventional construction machine. It is the front view which expanded and showed the control panel with which the construction machine shown in FIG. 9 is equipped.

  Embodiments of a construction machine according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a side view showing a mini excavator constituting a first embodiment of a construction machine according to the present invention, FIGS. 2 and 3 are views showing a main configuration of the first embodiment, and FIG. FIG. 3 is a perspective view showing the state of the engine control dial when the auto idle switch is on.

  As shown in FIG. 1, the first embodiment of the construction machine according to the present invention is a miniature excavator of, for example, a 1 to 2 t class, and a traveling body 1 and a revolving body 2 disposed on the traveling body 1. And a working device 3 attached to the swivel body 2 so as to be rotatable in the vertical direction and swingable in the horizontal direction. The work device 3 includes a boom 4 attached to the revolving structure 2, an arm 5 attached to the tip of the boom 4, and a bucket 6 attached to the tip of the arm 5. The working device 3 includes a boom cylinder 7 that drives the boom 4, an arm cylinder 8 that drives the arm 5, and a bucket cylinder 9 that drives the bucket 6. In addition, it can replace with the bucket 6 and various attachments can be mounted | worn. A blade 10 is provided at a front position of the traveling body 1. A driver's seat 11 is disposed on the revolving structure 2. Although not shown, this mini excavator includes various actuators such as a traveling right motor for traveling the traveling body 1, a traveling left motor, and a turning motor for rotating the revolving body 2 in addition to the cylinders 7, 8, 9 described above. It also has.

  As shown in FIGS. 2 and 3, the mini excavator according to the first embodiment is held in a box 12 disposed in the vicinity of the driver's seat 11 and attached instead of the attachment included in the work device 3, that is, the bucket 6. A work device operating device 13 included in a mechanical operation system is provided so that the attachment can be operated. The box 12 has an engine key switch 14 and a rotation speed indicator for indicating the engine rotation speed, for example, a rotation knob 15a, and an engine control for setting the engine rotation speed according to the rotation amount of the rotation knob 15a. A dial 15 is attached. A blade operating device 16 for operating the blade 10 is provided at the right side of the box 12. The plate operating device 16, a traveling right motor (not shown), a traveling operating device that operates the traveling left motor, and a swing operating device that operates a swing cylinder (not shown) that swings the working device 3 in the left-right direction are also used for work. As in the operation device 13, the structure is included in the mechanical operation system.

  As shown in FIGS. 2 and 3, when the work device operation device 13 is arranged on the right side of the driver's seat 11 and the attachment is attached instead of the bucket 6, the attachment can be operated by the work operation device 13. It has become. Although not shown in FIGS. 2 and 3, another operating device operating device capable of operating the arm 5 and the like included in the operating device 3 is also provided on the left side of the driver's seat 11. Therefore, it is possible to perform a complex operation such as operating the attachment by operating the work device operating device 13 while operating the arm 5 or the like by operating the work device operating device (not shown) on the left side.

  The mini excavator according to the first embodiment includes a control panel 17 capable of displaying various types of information such as drive information at the front side position of the operating device 13 for the working device. Furthermore, according to the first embodiment, when both the work device operating devices 13 arranged on the left and right sides of the driver's seat 11 are returned to the neutral position, after the predetermined time has elapsed, the engine speed is set to the preset speed ( An auto idle control system that performs control to reduce the engine speed from high idle) to a predetermined low rotational speed (low idle) is provided, and an auto idle switch that switches auto idle control between valid and invalid.

  The auto idle switch is provided at the rotation speed indicator position, that is, at the engine control dial 15 position. In the mini excavator according to the first embodiment, the auto idle switch is constituted by, for example, a push / push switch built in a lower position of the engine control dial 15, and the rotation knob 15 a of the engine control dial 15. The automatic idle control is switched between valid and invalid according to the pressing operation. That is, as shown in FIG. 2, when the rotation knob 15a of the engine control dial 15 is pressed once, the auto idle switch is turned off and the auto idle control is disabled. FIG. 2 shows a state in which the position of the rotary knob 15a is lowered by such an operation. When the rotation knob 15a is pressed again from such a state, the auto idle switch is turned on, and the auto idle control is enabled. FIG. 3 shows a state in which the rotary knob 15a is raised by such an operation.

  In the mini-excavator according to the first embodiment configured as described above, for example, the bucket 6 is attached to the tip of the arm 5 as shown in FIG. 1, and the operator sitting on the driver's seat 11 can switch the auto idle switch as shown in FIG. When the engine key switch 14 is operated in a state where the engine key switch 14 is turned on, that is, in a state where the automatic idle control is switched on, the engine is started and a hydraulic pump (not shown) is driven. The engine speed is increased to the set speed by a turning operation of the turning knob 20a of the engine control dial 20, and a necessary flow rate is discharged from the hydraulic pump. In this state, by selectively operating the operation devices 13 for the left and right working devices of the driver's seat 11, the corresponding directional control valves (not shown) are switched through the respective mechanical operation systems, and the boom cylinders 7, Pressure oil from the hydraulic pump is supplied to the corresponding ones of the arm cylinder 8 and the bucket cylinder 9, and the boom 4, the arm 5 and the bucket 6 are appropriately rotated to perform earth excavation work and the like.

  From such a state, for example, when both the left and right work device operating devices 13 of the driver's seat 1 are returned to the neutral position in order to pause the work, the engine speed is set to the set speed (after the predetermined time has elapsed). Auto idle control is performed in which the engine speed is reduced from a high idle) to a predetermined low rotational speed (low idle). As a result, the engine speed is kept at a predetermined low speed (low idle) during work pauses, and energy saving can be realized.

  When resuming the work that has been paused, the rotary knob 15a of the engine control dial 15 is pressed from the state shown in FIG. Thereby, as shown in FIG. 2, the position of the rotary knob 15a is lowered, and the auto idle switch is switched off, that is, the auto idle control is disabled. In response to this, the engine speed increases from a predetermined low speed (low idle) to a set speed. Therefore, the above-described excavation work of earth and sand can be performed again. Thereafter, when the rotation knob 15a of the engine control dial 15 is pressed again, the rotation knob 15a is raised to the position shown in FIG. 3, and the auto idle switch is turned on, that is, the auto idle control is enabled. . Therefore, when the work operation device 13 and the like are both returned to the neutral position, after a predetermined time has elapsed, as described above, the engine speed decreases from the set speed (high idle) to the predetermined low speed (low idle). .

  In addition, unlike the above-described excavation work of earth and sand, in place of the bucket 6, when attaching a breaker that crushes a concrete lump or the like or a fork grapple that holds a concrete lump or the like, If the idle control is made effective, the workability may deteriorate due to a decrease in the engine speed by the auto idle control. For example, when the attachment is a breaker, the impact force may be reduced, and when the attachment is a fork grapple, the object that has been gripped may be dropped. When there is such a concern during the operation of the attachment, the rotation knob 15a of the engine control dial 15 is pressed as shown in FIG. 2 to turn off the auto idle switch and disable the auto idle control. The desired work is performed. In this case, even when the work device operating device 13 and the like are both returned to the neutral position, the auto idle control is not executed, and the engine speed is continuously maintained at the set speed.

  According to the mini excavator according to the first embodiment configured as described above, the operation device 13 for the working device included in the mechanical operation system in which the attachment can be operated is provided, and the auto idle switch is connected to the engine. Since the engine control dial 15 and the auto idle switch are provided at substantially the same position at the position of the control dial 15, the operator sitting on the driver's seat 11 can operate the engine control dial 15 and the rotation knob 15a. In each of the operations of the auto idle switch by the pressing operation, these can be operated with almost no eye movement. Thereby, the feeling of fatigue given to the operator in accordance with the operation of the engine control dial 15 and the auto idle switch can be reduced. Therefore, in the apparatus provided with the work device operating device 13 included in the mechanical operation system so that the attachment can be operated, the operability of the auto idle control can be improved.

  FIG. 4 is a perspective view showing a configuration of a main part of a second embodiment of the construction machine according to the present invention, and FIG. 5 is an enlarged view of an engine control dial provided in the second embodiment.

  The construction machine according to the second embodiment is also a mini excavator similar to that shown in FIG. In the second embodiment as well, a rotation speed indicator that indicates the engine rotation speed has a rotation knob 20a, and includes an engine control dial 20 that sets the engine rotation speed according to the rotation amount of the rotation knob 20a. Yes. In addition, an auto idle switch for switching between enabling and disabling of the auto idle control is provided at the position of the engine control dial 20, and this auto idle switch is built in the engine control dial 20 portion and can be used to rotate the rotary knob 20 a. It consists of a switch that switches auto idle control between enabled and disabled accordingly.

  As shown in FIG. 5, a rotation speed setting area S in which the engine rotation speed can be designated in advance within the rotation area of the rotation knob 20a of the engine control dial 20, and an on position of the auto idle switch, that is, auto idle control. An effective switching position A for enabling the automatic idle switch and an invalid switching position B for disabling the automatic idle control are set. The auto idle switch is turned on when, for example, the rotary knob 20a is rotated clockwise, and the indicating portion 20a1 of the rotary knob 20a coincides with the effective switching position A, and the automatic idle control is enabled. To. Similarly, when the rotary knob 20a is turned clockwise and the indicating portion 20a1 of the rotary knob 20a coincides with the valid switching position B, the auto idle switch is turned off, and the auto idle control is disabled. To. When the rotary knob 20a is turned counterclockwise, even if the indication portion 20a1 of the rotary knob 20a coincides with the valid switching position A and the invalid switching position B, the on / off operation is not performed, and the switch up to that point It is set to continue the state.

  Other configurations are the same as those in the first embodiment described above. In FIG. 4, 18 is a right travel lever for operating the travel right motor, and 19 is a left travel lever for operating the travel left motor. The right traveling lever 18 and the left traveling lever 19 constitute a traveling operation device included in a mechanical operation system.

  In the mini-excavator according to the second embodiment configured as described above, an operator sitting on the driver's seat 11 turns the turning knob 20a of the engine control dial 20 clockwise, and moves the indication section 20a1 of the turning knob 20a. Once matched with the effective switching position A, the auto idle switch is turned on and the auto idle control is enabled. In this state, when the turning knob 20a is turned counterclockwise and the instruction portion 20a1 of the turning knob 20 is returned to the rotation speed setting area S, the engine speed increases to the set speed. Therefore, a desired work can be performed by operating the operating device 13 for the working device. Thereafter, for example, when the work device operation device 13 is returned to the neutral position in order to pause for a short time, the engine speed is changed from the set speed (high idle) to a predetermined low speed (low idle) after a predetermined time has elapsed. Idle).

  When the operation is resumed, the turning knob 20a of the engine control dial 20 is turned clockwise, and the instruction portion 20a1 of the turning knob 20a is once matched with the invalid switching position B. As a result, the auto idle switch is turned off, the auto idle control is disabled, and the engine speed increases from a predetermined low speed (low idle). Therefore, when the rotation knob 20a of the engine control dial 20 is turned counterclockwise and the instruction portion 20a1 of the rotation knob 20a is returned to the rotation speed setting area S, the engine rotation speed is determined by the instruction portion of the rotation knob 20a. The number of revolutions is designated by 20a1. In this state, a desired operation is performed. Thereafter, once the instruction portion 20a1 of the rotary knob 20a is made to coincide with the effective switching position A, and then the instruction portion 20a1 is returned to the position where the set rotational speed in the rotational speed setting region S is given again, as described above. Auto-idle control is performed at

  Further, when it is preferable to disable the auto idle control when performing an operation with an attachment attached instead of the bucket 6, the indicator 20 a 1 of the rotation knob 20 a of the engine control dial 20 is turned clockwise. The auto idle switch is turned off and the auto idle control is invalidated by matching with the invalid switching position B. In this state, when the rotary knob 20a is turned counterclockwise and the pointing portion 20a1 of the rotary knob 20a is returned to the rotation speed setting area S, a desired work corresponding to the set rotation speed can be performed. In this case, even when the operation device operating device 13 or the like is returned to the neutral position, the auto idle control is not performed, and the engine speed is continuously maintained at the set speed.

  Similarly to the first embodiment, the mini-excavator according to the second embodiment configured as described above is provided with the auto idle switch at the position of the engine control dial 20, so that the same effect as that of the first embodiment can be obtained. Can do.

  FIG. 6 is a perspective view showing a main configuration of a third embodiment of the construction machine according to the present invention.

  The construction machine according to the third embodiment shown in FIG. 6 is also a mini excavator similar to that shown in FIG. 1, for example, and a rotation speed indicator that indicates the engine rotation speed has a rotation knob 21a. The engine control dial 21 is used to set the engine speed corresponding to the rotation amount of the rotation knob 21a. In the third embodiment, the auto idle switch 22 for switching between valid and invalid of the auto idle control is provided on the rotation knob 21 a of the engine control dial 21. Other configurations are the same as those in the first embodiment described above.

  FIG. 7 is a perspective view showing a configuration of a main part of a fourth embodiment of the construction machine according to the present invention, and FIG. 8 is an enlarged front view showing a throttle lever provided in the fourth embodiment.

  The construction machine according to the fourth embodiment shown in FIGS. 7 and 8 is also a mini excavator similar to that shown in FIG. The engine speed indicator for instructing the engine speed comprises a throttle lever 23 for setting the engine speed in accordance with the swing operation amount. In the fourth embodiment, the auto idle switch 24 for switching between valid and invalid of the auto idle control is provided on the grip 23a of the throttle lever 23 as shown in FIG. Other configurations are the same as those in the first embodiment described above.

  In both of the third embodiment shown in FIG. 6 and the fourth embodiment shown in FIGS. 7 and 8, the auto idle switches 22 and 24 are respectively set to the position of the engine control dial 21 as in the first embodiment. Alternatively, since it is provided at the position of the throttle lever 23, an effect equivalent to that of the first embodiment can be obtained.

2 Rotating body 3 Working device 11 Driver's seat 13 Operating device operating device 15 Engine control dial (rotation speed indicator)
15a Rotation knob 20 Engine control dial (rotation speed indicator)
20a Rotation knob 20a1 Indicator 21 Engine control dial (rotation speed indicator)
21a Rotation knob 22 Auto idle switch 23 Throttle lever (rotation speed indicator)
23a Grip 24 Auto idle switch S Rotation speed setting area A Effective switching position B Invalid switching position

Claims (4)

Arranged near the driver's seat on the swivel body, provided to be able to operate the attachment included in the work device and included in the mechanical operation system, the work device operation device, and the engine speed indicating the engine speed An indicator, and an auto idle control system that controls the engine speed to be reduced from a preset speed to a predetermined low speed when the operating device operating device is returned from the operating position to the neutral position. And a construction machine having an auto idle switch that switches between valid and invalid of the auto idle control,
A construction machine, wherein the auto idle switch is provided at the rotation speed indicator position. The construction machine according to claim 1,
The construction machine consists of a mini excavator,
The rotation speed indicator includes a rotation knob, and includes an engine control dial that sets the rotation speed of the engine according to the rotation amount of the rotation knob.
The auto idle switch includes a switch that switches between enabling and disabling the auto idle control in response to a pressing operation of the engine control dial on the rotating knob or a rotating operation of the rotating knob. Construction machinery. The construction machine according to claim 1,
The construction machine consists of a mini excavator,
The rotation speed indicator includes a rotation knob, and includes an engine control dial that sets the rotation speed of the engine according to the rotation amount of the rotation knob.
A construction machine, wherein the auto idle switch is provided on the turning knob of the engine control dial. The construction machine according to claim 1,
The construction machine consists of a mini excavator,
The speed indicator comprises a throttle lever for setting the engine speed according to the swing operation amount,
A construction machine, wherein the auto idle switch is provided on a grip of the throttle lever.

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