JP4446990B2 - Throttle volume device for construction machinery - Google Patents

Description

  The present invention relates to a throttle volume device for a construction machine, and in particular, a construction in which an optimum engine speed and work mode are set by rotating a dial knob in accordance with a work form of a construction machine such as a hydraulic excavator. The present invention relates to a throttle volume device of a machine.

  Conventionally, in this type of construction machine, an engine having a governor mechanism for controlling the number of revolutions and a variable hydraulic pump driven by the engine are mounted, and working and traveling actuators are operated by hydraulic pressure. . The operation amount of the throttle is detected by a potentiometer, and a drive signal corresponding to the detected signal is output to the governor drive motor to adjust the engine speed (for example, see Patent Document 1).

  In general, there are various types of work in a work using a construction machine such as a hydraulic excavator. For example, heavy excavation work that requires maximum force such as rock removal work, standard excavation work that requires moderate force such as earth and sand excavation, etc. As such, it is classified into light excavation work that requires very little force.

  Also, according to the work mode, the mode is divided into a heavy excavation mode, a standard excavation mode, a light excavation mode, etc., and an operation mode selection switch for selecting an engine speed corresponding to each mode setting value and an operator manually There is known a throttle volume device for a construction machine provided with an engine speed control switch for setting the engine speed. According to this, it is possible to arbitrarily select the various work modes with the work mode selection switch, and change the engine speed with the engine speed control switch, so that the engine operating conditions are adapted to the desired work mode. Can be controlled (see, for example, Patent Document 2).

  Further, a throttle volume device for a construction machine as shown in FIGS. 9 and 10 is also known. FIG. 9 shows an arrangement example of a switch for selecting the work mode (mode selection switch) and a switch for controlling the engine speed (throttle volume). An operator seat 101 is provided inside the cab 100. It is placed. A console 102 is provided near the right side of the operator seat 101, and a throttle volume 103 is attached to the upper surface of the console 102.

  Further, a monitor switch panel 104 is attached to the right side wall 100a of the cab 100, and a mode selection switch 105 and a monitor display unit 106 are incorporated in the monitor switch panel 104 as shown in FIG. The work mode switched in step S is displayed on the work mode monitor 106 a of the monitor display unit 106.

  As shown in FIG. 11, the throttle volume 103 is composed of a throttle volume main body 103a housing a variable resistor main body and a throttle volume knob 103b. By rotating the throttle volume knob 103b, the variable volume resistor 103 Resistance can be changed (throttle volume operation).

The throttle volume main body 103a is formed with a display portion 103c for displaying the magnitude of the throttle volume operation. Further, the throttle volume knob 103b is provided with an instruction section 103d, and a desired throttle volume operation can be set by rotating the throttle volume knob 103b to align the instruction section 103d with an arbitrary position of the display section 103c.
Japanese Patent Laid-Open No. 9-53479. Japanese Patent No. 2974336.

  In the invention of Patent Document 1, one stopper is provided on the throttle side, and two stoppers are provided on the throttle device body side so that the range restricted by these stoppers can be operated, and the engine speed is adjusted by the operator's operation. In addition, the throttle drive motor can turn the throttle to a predetermined position, but there is no means for locking the throttle at an arbitrary position. Further, the operator needs to confirm the position of the throttle directly with the eyes except the range regulated by the stopper.

  On the other hand, the invention of Patent Document 2 includes a work mode selection switch and an engine speed control switch. The work mode is selected by the work selection switch and the engine speed is increased / decreased by the engine speed control switch. Since the switch to be selected and the switch for controlling the engine speed are different in mounting position, there is a problem that the operation is troublesome when both switches are operated.

  Further, since the mode selection switch 105 has to switch the work mode at the time of pressing operation, the operation is complicated and the configuration is complicated. In addition, the throttle volume 103 and the mode selection switch 105 are required, and there is a risk that a switch that should be operated is mistaken for another switch and erroneously operated.

  In addition, when the throttle volume knob 103b is rotated and the instruction section 103d is set to an arbitrary position on the display section 103c, or when the operation mode monitor 106a is switched by pressing the mode selection switch 105, the operator The work mode monitor 106a of the monitor switch panel 104 needs to be directly visually confirmed, and attention must be paid to the surroundings of the work area during the confirmation, resulting in a large work load. .

  Therefore, it is possible to prevent erroneous operation when switching the work mode and to reliably maintain the mode setting state after switching, improving the reliability of the mode switching operation and making the mode setting state easy for the operator. Therefore, a technical problem to be solved in order to be able to be grasped will arise, and the present invention aims to solve this problem.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is provided with a dial knob capable of rotating the throttle volume for controlling the engine speed and a plurality of work modes, In the throttle volume device of a construction machine that switches the work mode by rotating the dial knob,
A lock mechanism that prevents rotational movement to the predetermined work mode by the dial knob when switching to a predetermined work mode, and a lock release button that releases the lock, and by operating the lock release button, The dial knob is configured to allow the rotational movement to the predetermined work mode ,
A construction machine configured to provide a detent mechanism in the throttle volume capable of obtaining a sense of moderation with respect to the rotation operation of the dial knob, and to switch a work mode corresponding to a moderation position where the sense of moderation is obtained. A throttle volume device is provided.

  According to this configuration, when the lock mechanism is in the locked state, the dial knob cannot be rotated to a predetermined work mode, but can be rotated to another work mode other than the predetermined work mode. The predetermined work mode can be freely determined by the designer from a plurality of work modes when designing the throttle volume. In addition, even when the lock mechanism is in the locked state and the rotational movement to the predetermined work mode by the dial knob is prevented, the dial knob is operated by releasing the lock mechanism by operating the lock release button. Is allowed to rotate, and the dial knob can be rotated.

  According to this configuration, as described in 0015, by operating the lock release button to release the locked state of the lock mechanism, the dial knob is allowed to rotate to a predetermined work mode, and the dial knob is rotated. Operation becomes possible. On the other hand, when switching to another work mode while the lock mechanism is in the locked state, the operator can obtain a sense of moderation due to the detent as the dial knob rotates.

According to a second aspect of the present invention, the lock mechanism is formed on a pedestal fixed to a base fixing portion around the dial knob, and a plurality of continuous arc-shaped grooves having different diameters are fitted into the arc-shaped grooves. The throttle of a construction machine according to claim 1, further comprising: a lock portion provided so as to be movable integrally with the lock release button; and an elastic member that presses and locks the lock portion to the outer peripheral surface of the arcuate groove. A volume device is provided.

  According to this configuration, the rotation operation to the predetermined work mode by the dial knob can be reliably prevented.

According to a third aspect of the invention, the arcuate moderation groove provided along the circumference of the outer peripheral surface of the groove, according to claim 1 or 2 configured as detent feeling is obtained by providing a detent projection on the locking portion A throttle volume device for a construction machine as described is provided.

  According to this configuration, a sense of moderation can be obtained without increasing the number of parts, and the holding force in the selected work mode is also increased.

Fourth aspect of the present invention provides a throttle volume system for a construction machine according to claim 1, wherein configured to so that be reported The sections replacement operation state buzzer when switching operation of the working mode.

  According to this configuration, when the work mode is switched by the dial knob, the operator can audibly recognize the switching operation state by the sound of the buzzer.

The invention of claim 5, wherein the type of the buzzer sound is provided a throttle volume system for a construction machine according to claim 4, wherein configured to so that different depending on the switching position of the working mode.

  According to this configuration, when the work mode is switched to another type by the dial knob, the type of the buzzer sound changes according to the switching position. Therefore, the operator selects the type of the work mode after switching according to the type of the buzzer sound. Can be audibly discriminated.

According to a sixth aspect of the invention provides a throttle volume system for a construction machine according to claim 4 or 5, wherein the configuration so that displays at monitoring the working mode at the time of switching operation of the working mode.

  According to this configuration, when the work mode is switched by the dial knob, the work mode is displayed on the monitor, so that the operator can know the type of the current work mode on the monitor.

  According to the first aspect of the present invention, when switching to the predetermined work mode, the dial knob cannot be rotated unless the lock release button is pressed, so that the operator can be surely prevented from switching to the predetermined work mode by mistake. Can do. Therefore, it is possible to avoid the danger caused by inadvertently switching the work mode to the predetermined work mode, and it is possible to improve the safety at the time of switching the work mode compared to the conventional case. In addition, for example, there is no risk of inadvertently switching from a standard excavation work mode with good fuel consumption to a heavy excavation work mode with poor fuel consumption, so that fuel economy can be improved and environmental load can be reduced.

In addition, the present invention can avoid the danger caused by inadvertently switching the work mode to a predetermined work mode, can improve the safety at the time of switching the work mode as compared with the prior art, and improve the fuel efficiency. Environmental load can be reduced. In addition, the operator can know the rotation operation state from the sense of moderation obtained by the operator during the rotation operation, and it is possible to switch to the work mode corresponding to the moderation position. Since it is not necessary to visually confirm the rotation state of the knob, the operability of the dial knob is further improved.

The invention according to claim 2 locks the lock portion that fits into a plurality of continuous arc grooves having different diameters against the outer peripheral surface of the arc groove, in addition to the effect of the invention according to claim 1. Switching to a predetermined work mode can be reliably prevented, and a lock mechanism can be constructed with fewer parts.

In the invention described in claim 3 , since the moderation groove is provided in the arc-shaped groove and the moderation protrusion capable of entering and exiting the moderation groove is provided in the lock portion, in addition to the effect of the invention described in claim 1 or 2 Thus, a feeling of moderation can be obtained without increasing the number of predetermined parts, and the work mode can be switched in accordance with the moderation position, and the holding force in the selected work mode is also increased, so that an erroneous operation can be prevented.

In the invention described in claim 4 , since the operator can know the switching operation state by the sound of the buzzer when the work mode is switched, the switching operation state can be easily determined in addition to the effect of the invention described in claim 1. This has the advantage that visual confirmation is unnecessary.

In the invention according to claim 5 , since the operator can discriminate the type of work mode by the tone of the buzzer, in addition to the effect of the invention according to claim 4 , the operator can easily know the type of work mode after switching. In this case, since it is not necessary to visually confirm the type of work mode, the burden on the operator is reduced compared to the conventional case.

In the invention described in claim 6 , since the operator can discriminate the current work mode on the monitor, in addition to the effect of the invention described in claim 1, 4 or 5, the operator can know the type of the work mode only by looking at the monitor. In this case, even if the surrounding is dark, it can be clearly seen on the monitor.

  The present invention prevents erroneous operation at the time of switching the work mode, reliably maintains the mode setting state after the switching, improves the reliability of the mode switching operation, and allows the operator to change the mode setting state. For the purpose of making it easy to grasp, a dial knob that can be rotated is provided in a throttle volume that controls the engine speed and a plurality of work modes, and the work mode is switched by rotating the dial knob. A throttle mechanism for a construction machine, comprising: a lock mechanism for preventing rotational movement to the predetermined work mode by the dial knob when switching to a predetermined work mode; and a lock release button for releasing the lock, By operating the lock release button, the dial knob rotates to the predetermined work mode. It was achieved by the acceptable configure.

  A preferred embodiment of the present invention will be described below with reference to FIGS. This embodiment is a throttle volume device configured so that a sense of moderation can be obtained when an operator rotates a dial knob having a plurality of work mode switching positions, and the dial knob rotates to a predetermined work mode. The lock mechanism for preventing the movement includes a plurality of continuous arc-shaped grooves having different diameters formed on a pedestal (base fixing portion side) around the dial knob, a lock portion fitted in the arc-shaped groove, and the lock A spring that presses and locks the portion against the outer peripheral surface of the arc-shaped groove, and the lock portion is provided so as to be movable together with the unlock button, and the lock is released by pressing the lock release button, and the dial It is characterized in that the rotational movement of the knob is allowed. In this embodiment, the construction machine is applied to a hydraulic excavator. However, the present invention can also be applied to construction machines other than the hydraulic excavator.

  FIG. 1 is an overall view showing a throttle volume device for a construction machine according to the present embodiment. In the figure, reference numeral 11 denotes a controller that controls the overall operation of the hydraulic excavator. The controller 11 stores programs for executing various processes, an engine 12, a hydraulic pump 13, a throttle volume device switch section (hereinafter referred to as a volume switch) 14, a buzzer 15, a monitor 16, and the like. Is connected.

  The engine 12 is a drive source that drives a hydraulic excavator, and is, for example, a diesel engine. The hydraulic pump 13 drives an actuator 17 including various hydraulic cylinders that operate a boom, an arm, a bucket, and the like of the excavator, and operates by receiving the driving force of the engine 12.

  The buzzer 15 notifies various operation states (operation modes) of the hydraulic excavator, and is connected to the controller 11 via a buzzer control circuit 15a. The buzzer control circuit 15a changes the type of buzzer sound according to the signal from the controller 11. The monitor 16 is connected to the controller 11 via a monitor control circuit 16a, and various operating states of the hydraulic excavator are displayed on the screen of the monitor 16.

  Further, the volume switch 14 sets the rotational speed of the engine 12 to an optimum value for work and travel, and is provided at the console portion in the cabin so that the switch operator can easily operate the switch. Yes.

  FIG. 2 is a plan view of a console portion provided with a throttle volume device. 3 is a longitudinal sectional view of FIG. 2. The volume switch 14 is attached to the inside of the right console cover 20 via a mounting bracket 19. A rotary shaft 21 is provided in the upper part of the volume switch 14, and a vertical groove is formed on the entire upper end of the rotary shaft 21. Further, a waterproof packing 22 is attached to the middle portion of the rotating shaft 21, and the upper portion of the rotating shaft 21 protrudes obliquely upward from the front inclined portion of the right console cover 20.

  Reference numeral 23 denotes a dial knob that can be rotated. By rotating the dial knob 23, the engine speed and a plurality of work modes are controlled. The dial knob 23 is formed in a cylindrical shape with an open bottom surface, and a cylindrical portion 24 is provided at the center of the upper base inside the dial knob 23. The cylindrical portion 24 is connected to the upper portion of the rotating shaft 21 so as to be integrally rotatable.

  The dial knob 23 is rotated by an operator when the work mode is switched. Further, a pointer 25 is provided on the upper surface of the dial knob 23, and an index 26 is formed on the outer peripheral portion of the dial knob 23 in the right console cover 20. Marks indicating three or more work modes are formed on the index 26.

  In the illustrated example as the index 26, a special heavy excavation work mode (hereinafter referred to as SP mode) in which the engine power is set to the maximum with priority on speed, and a heavy excavation work mode (hereinafter referred to as H mode) in which fuel efficiency is prioritized over speed. And a mark indicating a standard excavation work mode (hereinafter referred to as A mode) which is slow and does not require a large excavation force. The A mode has an operation range (Amin to Amax) of a predetermined angle.

  As shown in FIG. 4, a substantially rectangular attachment hole 27 is opened on one side surface of the dial knob 23, and a lower edge portion of the attachment hole 27 is formed to protrude outward in a substantially V shape. A lock member 28 is disposed in the mounting hole 27, and the shape of the lock member 28 in a plan view is formed in a substantially U shape having an arcuate inner peripheral surface.

  A lock release button 29 is integrally formed on one side of the lock member 28, and the lock release button 29 is slidably mounted in the mounting hole 27 of the dial knob 23 and has a diameter relative to the dial knob 23. It is configured to be able to reciprocate in the direction (lock / unlock direction).

  Further, one side surface of the cylindrical portion 24 of the dial knob 23 is engaged with the U-shaped inner surface of the lock member 28, and a spring (attached) is provided between the other side surface of the cylindrical portion 24 and the lock release button 29. Force means) 30 is interposed. Due to the biasing force of the spring 30, the lock release button 29 is always biased radially outward (in the locking direction) with respect to the dial knob 23, and the U-shaped inner surface of the lock member 28 is It is in contact with one side in a pressed state. Therefore, when the operator rotates the dial knob 23, the lock member 28 rotates together with the cylindrical portion 24.

  A lock portion 31 protrudes downward from the lower end portion of the lock member 28. The lock portion 31 is formed in an arc shape, and a semi-cylindrical fitting convex portion 32 is integrally provided on one outer peripheral surface of the lock portion 31.

  Reference numeral 33 denotes a pedestal, which is fixed on the upper surface of the mounting bracket 19. As shown in FIGS. 3 and 4, a through hole 34 is provided in the center of the pedestal 33, and the rotary shaft 21 of the volume switch 14 is rotatably inserted into the through hole 34. The pedestal 33 is provided with an arcuate groove 35, and the arcuate groove 35 extends in the rotation direction of the rotary shaft 21.

  As shown in FIG. 5, the arc-shaped groove 35 is formed to extend in a clockwise direction from the start end portion toward the end portion, and the lock portion 31 extends along the arc-shaped groove 35 in the arc-shaped groove 35. And is movably fitted. The lock portion 31 is held in a pressed state on the outer peripheral surface of the arc-shaped groove 35 by the biasing force of the spring 30.

  The arc-shaped groove 35 is connected to the first arc-shaped groove R1, the second arc-shaped groove R2 having a smaller radius than the arc-shaped groove R1, and the first arc-shaped groove R1 and the second arc-shaped groove R2. The arc-shaped groove 35 is composed of a groove R3, and is formed in a substantially Z shape in plan view. First and second stopper wall portions 36 and 37 are provided at the end portions of the first arc-shaped groove R1 and the second arc-shaped groove R2, respectively. The first stopper wall portion 36 is formed on the end surface of the first arcuate groove R1, and the second stopper wall portion 37 is formed on the end surface of the second arcuate groove R2. Further, when the front end surface of the lock portion 31 hits the first and second stopper wall portions 36 and 37, the movement of the lock portion 31 is restricted to the set position of the H mode and the SP mode, respectively.

  On the outer peripheral surface portion of the arc-shaped groove 35, first to fourth fitting concave portions 38 to 41 having a substantially semicircular shape in plan view are sequentially arranged with a predetermined interval from the start end portion toward the end direction. . That is, the first fitting recess 38 is provided on the start end side of the arc-shaped groove 35 and corresponds to the idle position, that is, the A mode minimum value (Amin). The second fitting recess 39 is provided in front of the end portion of the arc-shaped groove 35 and corresponds to the set position of the A mode maximum value (Amax).

  Further, the third and fourth fitting recesses 40 and 41 are provided on the terminal sides of the first arc-shaped groove R1 and the second arc-shaped groove R2, respectively, and correspond to the setting positions of the H mode and the SP mode. Yes.

  A number of moderation grooves 43 are provided between the first fitting recess 38 and the second fitting recess 39, and the groove width of the moderation groove 43 is the first to fourth fitting recesses 38 to 41. It is formed smaller than the diameter dimension.

  Accordingly, when the fitting convex portion 32 moves while being in contact with a large number of moderation grooves 43, the amount of depression of the fitting convex portion 32 into the moderation groove 43 is small, so that the dial knob 23 can be operated with a relatively light rotational operation force. The operator can recognize the small moderation feeling by the touch of the finger.

  FIG. 5 shows a state where the idle position (Amin) is set, and the back surface of the lock portion 31 is in contact with the starting end surface of the first arcuate groove R1. In this set state, the lock member 31 is biased radially outward by the force of the spring 30. For this reason, the lock portion 31 is pressed against the outer peripheral surface of the first arcuate groove R1, and the fitting convex portion 32 falls into the first fitting concave portion 38 and is held.

  When the engine 12 is driven in this idle position (Amin) setting state, idling operation is started. Thereafter, when setting to the Amax or H mode, the operator only needs to rotate the dial knob 23 and does not need to press the lock release button 29.

  Thus, when the dial knob 23 is rotated with a force larger than the holding force, the fitting convex portion 32 comes out of the fitting concave portion 38 against the urging force of the spring 30, and the dial knob 23 can be rotated. . Further, when the dial knob 23 is rotated, the fitting convex portion 32 falls into the moderation groove 43 and is repeatedly pulled out of the moderation groove 43, so that the operator can recognize a small degree of moderation by the touch of the finger. Thereafter, when the fitting convex portion 32 moves to a position corresponding to the second fitting concave portion 39, the fitting convex portion 32 falls and is held in the fitting concave portion 39 by the urging force of the spring 30. At this time, the operator recognizes a greater sense of moderation by touching the finger and recognizes that it has been set to Amax.

  FIG. 6 shows the state switched to Amax. In this case, the fitting convex portion 32 is held in the second fitting concave portion 39 by the urging force of the spring 30, but this position is maintained unless a force larger than the holding force is applied, and the holding force When the dial knob 23 is further rotated with a greater force, the mode can be switched to the H mode.

  FIG. 7 shows the state switched to the H mode. In this H mode setting state, the fitting convex portion 32 is held by the third fitting concave portion 40, and the front end surface of the lock portion 31 abuts on the first stopper wall portion 36 and is regulated. Therefore, the dial knob 23 cannot be rotated to the SP mode side unless the lock portion 31 is once moved radially inward (unlock direction).

  Actually, to switch from the H mode to the SP mode, the operator pushes the lock release button 29 to the back position to release the locked state of the dial knob 23, and then rotates the dial knob 23 to the SP mode side. It is necessary to switch the mode by moving the lock unit 31.

  Now, in the H mode, when the lock release button 29 is pushed to shorten the spring 30, the lock portion 31 moves radially inward (unlock direction) along the first stopper wall portion 36, It temporarily stops on the starting end face side of the second arcuate groove R2 through the connecting groove R3 leading to the terminal end of the arcuate groove R1. In this stop position, the front end surface of the lock portion 31 is disposed radially inward from the first stopper wall portion 36 and faces the second stopper wall portion 37 on the terminal side of the second arcuate groove R2. The back surface of the lock portion 31 is close to the starting end surface of the second arcuate groove R2.

  Then, while the lock release button 29 is kept pressed, the dial knob 23 is rotated in the direction toward the end of the second arcuate groove R2, so that the front end surface of the lock portion 31 becomes the second stopper wall portion 37. And the fitting convex part 32 moves to a position corresponding to the fourth fitting concave part 41.

  Thereafter, when the operator releases the pressed state of the lock release button 29, the lock portion 31 is instantaneously moved radially outward (lock direction) along the second stopper wall surface 37 by the biasing force of the spring 30. Moving. As a result, as shown in FIG. 8, the lock portion 31 is pressed against the outer peripheral surface of the second arcuate groove R <b> 2, and the fitting convex portion 32 falls and is held in the fourth fitting concave portion 41. . Thus, the SP mode is switched. In this embodiment, the H mode and the SP mode are set at a predetermined place, but can be provided in a certain angle range.

  In the above configuration, when the dial knob 23 is rotationally displaced from the idle position (Amin) toward the Amax side, the engine speed increases accordingly. When the operation position of the dial knob 23 is set to A mode (Amin, Amax), H mode or SP mode, a signal corresponding to each work mode is sent from the volume switch 14 to the controller 11 to switch the mode. Is called.

  Further, when setting the work mode switching, the controller 11 transmits a signal corresponding to the work mode switching position to the buzzer control circuit 15a and the monitor control circuit 16a. That is, the buzzer control circuit 15a transmits to the buzzer 15 a type of sound signal corresponding to the signal from the controller 11 from a plurality of types of sound, and generates a notification sound for a predetermined time. In the present embodiment, the type of sound generated from the buzzer 15 varies depending on the mode switching position, and the tone changes, for example, “beep”, “beep”, “beep”, etc.

  Accordingly, the operator can audibly recognize the work mode switching position from the tone of the buzzer 15. In particular, by changing the type of sound according to the type of work mode, the operator can also determine the type of work mode after switching according to the type of sound.

  In the monitor control circuit 16a, a display signal corresponding to the signal from the controller 11 is sent to the monitor 16, and the type of the current work mode is displayed on the screen of the monitor 16 as characters or figures. Therefore, since the operator can visually discriminate the switched work mode 16 on the monitor, the current work mode can be clearly confirmed only by looking at the screen of the monitor 16 even in a dark place. .

  As described above, in this embodiment, when the work mode is switched from the H mode to the SP mode, the dial knob 23 cannot be rotated unless the lock release button 29 is pressed, but it resists the biasing force of the spring 30. When the lock release button 29 is pressed, the locked state is released, so that the dial knob 23 can be rotated to the SP mode.

  Therefore, when switching the work mode to the SP mode, the operator must rotate the dial knob 23 while pressing the lock release button 29, so that it is possible to reliably prevent the operator from switching to the SP mode by mistake.

  After the operation mode is switched by rotating the dial knob 23, the lock portion 31 is pressed against the outer peripheral surface of the arc-shaped groove 35 by the biasing force of the spring 30, and the fitting convex portion 32 falls into the fitting concave portions 39 to 41. Since it is held, the holding force with respect to the dial knob 23 at the mode setting position increases, and there is no possibility that the dial knob 23 is switched unexpectedly. Therefore, it is possible to avoid a danger caused by inadvertently switching the work mode. Furthermore, since there is no fear of unexpectedly switching to the SP mode with poor fuel consumption, the environmental load can be reduced while the fuel consumption is reduced.

  Further, when the first lock portion 31 moves through the moderation groove 43, or when the first lock portion 31 falls into or falls out of the first to fourth fitting recesses 38 to 41, the change in feel is transmitted to the operator's finger. Therefore, when the operation mode is switched, the operator gets a feel corresponding to the rotational resistance of each work mode. Therefore, the operation mode can be switched reliably and easily without visually checking the rotational position of the dial knob 23. Can be executed.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified one.

The control block diagram of the throttle volume apparatus of a construction machine which shows one Example of this invention. The top view of the console part provided with the throttle volume apparatus same as the above. The longitudinal cross-sectional view of a throttle volume apparatus same as the above. The perspective view of a throttle volume apparatus same as the above. The principal part detail figure explaining the position of a lock | rock part when setting a throttle volume apparatus same as the above to an idle position (A mode minimum value). The principal part detail figure explaining the position of a lock | rock part when a throttle volume apparatus is set to the A mode maximum value same as the above. The principal part detail figure explaining the position of a lock | rock part when a throttle volume apparatus is set to H mode same as the above. The principal part detail drawing explaining the position of a lock | rock part when a throttle volume apparatus is set to SP mode same as the above. The switch arrangement figure in the conventional driver's cab. A conventional monitor switch panel diagram. FIG.

Explanation of symbols

11 Controller 12 Engine 13 Hydraulic pump 14 Volume switch (Throttle volume switch)
15 Buzzer (notification means)
16 Monitor 17 Actuator 19 Mounting bracket 21 Rotating shaft 23 Dial knob (Rotation operation knob)
27 Mounting hole 28 Lock member 29 Lock release button 30 Spring (biasing means)
31 Lock part 32 Fitting convex part 33 Base 34 Through hole 35 Arc-shaped groove 36 First stopper wall part 37 Second stopper wall part 38 First fitting concave part (idle setting position / Amin)
39 Second fitting recess (Amax setting position)
40 Third fitting recess (H mode setting position)
41 4th fitting recessed part (SP mode setting position)
43 Moderation groove (detent mechanism)

Claims (6)

In a throttle volume device of a construction machine, which is provided with a dial knob that can be rotated in a throttle volume that controls the engine speed and a plurality of work modes, and the work mode is switched by rotating the dial knob.
A lock mechanism that prevents rotational movement to the predetermined work mode by the dial knob when switching to a predetermined work mode, and a lock release button that releases the lock, and by operating the lock release button, The dial knob is configured to allow the rotational movement to the predetermined work mode ,
In addition, a detent mechanism that provides a sense of moderation with respect to the rotation operation of the dial knob is provided in the throttle volume, and the work mode is switched in accordance with the moderation position where the sense of moderation is obtained. Throttle volume device for construction machinery. The lock mechanism is formed on a pedestal fixed to a base fixing portion around the dial knob, and is fitted into a plurality of continuous arc grooves having different diameters, and the lock release button. 2. A throttle volume device for a construction machine according to claim 1 , comprising: a lock portion provided so as to be movable integrally with the elastic member; and an elastic member that presses and locks the lock portion to the outer peripheral surface of the arc-shaped groove . The click groove provided along the circumference of the outer peripheral surface of the arcuate groove, the construction of claim 1 or 2, wherein the configured as detent feeling is obtained by providing a detent projection on the locking portion Mechanical throttle volume device. Throttle volume system for a construction machine according to claim 1, characterized by being configured to so that be reported The sections replacement operation state buzzer when switching operation of the working mode. Throttle volume system for a construction machine according to claim 4, wherein the type of the buzzer sound is characterized by being configured to so that different depending on the switching position of the working mode. Throttle volume system for a construction machine according to claim 4 or 5, wherein a configured to so that displays at monitoring the working mode at the time of switching operation of the working mode.

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