JP2009024369A - Decelerator device for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decelerator device for a construction machine capable of automatically reducing rotational speed of an engine down to an idling condition when an operator leaves the construction machine. <P>SOLUTION: A main body frame 1 is provided with a main lever 2 connected with a throttle lever 9 of the construction machine through a first pull cable 10 and an auxiliary lever 4 connected with a control lever 11 of the engine through a second pull cable 12. This decelerator device is provided with a decelerator motor 8 switching the auxiliary lever 4 into a state for turning the auxiliary lever 4 in synchronization with the main lever 2 or a state for returning the auxiliary lever 4 to an initial position irrespective of position of the main lever 2. A bounding detection switch 16 is provided in an operation box 15. When bounding operation of the operation box 15 is detected by the bounding detection switch 16, current is carried into the decelerator motor 8, and the auxiliary lever 4 is returned to a position where engine speed is reduced down to the idling condition. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a construction machine decelerating device used for reducing the engine speed to an idling state when the load of the construction machine is reduced.

  Conventionally, in construction machines such as hydraulic excavators, the engine speed is lowered to an idling state when the load is reduced when work or travel is not performed, and the engine speed is immediately restored to the original set speed at the start of work or travel. It has been proposed to be equipped with a decelerating device to suppress wasteful fuel consumption and noise.

  In general, this type of decelerating device is connected to a throttle lever of a construction machine via a first pull cable and to a control lever of the engine via a second pull cable. A second lever is provided on the body frame, and the second lever is rotated in conjunction with the rotation of the first lever. From this state, the second lever is An actuator for releasing the interlock with the first lever and switching the second lever so that the engine control lever returns to the idling position is provided.

  More specifically, as shown in FIG. 4 and FIGS. 5 (a) and 5 (b), one end portion of the main lever 2 as the first lever is connected to the main body frame via the first rotation shaft 3. It is pivotally attached to 1. An intermediate portion in the longitudinal direction of the sub-lever 4 as a second lever is pivotally attached to the intermediate portion in the longitudinal direction of the main lever 2 via a second rotation shaft 5. Furthermore, when the other end portions of the main lever 2 and the sub-lever 4 are overlapped with each other at one end portion of the sub-lever 4, an arc shape centering on the first rotation shaft 3 is formed at least partially. A slit 6 is formed, and an engaging pin 7 that is slidably engaged with the slit 6 of the sub lever 4 is pivoted about the second pivot shaft 5. A double-acting decel motor (double-acting electric motor) 8 is provided in the main body frame 1 as an actuator for double-acting as described above.

  The other end of the main lever 2 is connected to the other end of the first pull cable 10 having one end connected to the throttle lever 9 of the construction machine, and the other end of the sub lever 4 is connected to the engine control. The other end of the second pull cable 12 having one end connected to the lever 11 is connected.

  Furthermore, the decel switch 13 for driving the decel motor 8 is provided at the tip of the operation lever 14 for operating the construction machine. Reference numeral 15 denotes an operation box (console) provided in the driver's seat of the construction machine, and the operation lever 14 is attached to the operation box 15.

  According to the decel device configured as described above, the position of the engaging pin 7 is shown in FIG. 5 (a) in a state where the other end portions of the main lever 2 and the sub lever 4 are overlapped with each other in the initial state. When the arrangement is fixed by the deceleration motor 8, the rotation of the sub lever 4 with respect to the main lever 2 with the second rotation shaft 5 as a fulcrum is blocked by the engaging pin 7. Is within the range allowed by the slit 6 and can only rotate integrally with the main lever 2 with the first rotation shaft 3 as a fulcrum. Therefore, when the throttle lever 9 is rotated in this state, the sub lever 4 is rotated together with the main lever 2 in conjunction with the rotation of the main lever 2 via the first pull cable 10. Since it can be moved, the control lever 11 can be rotated via the second pull cable 5. Therefore, the control lever 11 is operated in accordance with the operation of the throttle lever 9 so that the rotational speed of the engine can be arbitrarily adjusted to a required value necessary for the work and traveling of the construction machine.

  On the other hand, when the load of the construction machine is temporarily interrupted, the operator operates the decel switch 13 provided on the operation lever 14 to energize the decel motor 8 and drive it. When the engaging pin 7 is rotated clockwise by a predetermined angle, the auxiliary lever 4 is released from the overlapping state with the main lever 2 and rotated about the second rotating shaft 5 as shown in FIG. Therefore, the engine control lever 11 is returned to the idling position via the second pull cable 12 independently of the throttle lever 9 so that the engine speed can be lowered to the idling state. .

  Further, when the work or running is started again after the load of the construction machine is reduced, the decel switch 13 of the operation lever 14 is operated in the cab to stop energization of the decel motor 8, and the decel motor When the engagement pin 7 is rotated counterclockwise and returned to its original position by returning 8 to the initial state, the sub lever 4 overlaps with the main lever 2 around the second rotation shaft 5. Since the control lever 11 is returned to the original position defined by the throttle lever 9 via the second pull cable 12, the rotational speed of the engine is controlled by the throttle lever. 9 can be restored to the original set rotational speed set by 9 (see, for example, Patent Document 1).

  By the way, in a general construction machine such as a hydraulic excavator, operation boxes (console) having operation levers similar to those shown in FIG. 4 are arranged on both the left and right sides of the driver's seat. At least the operation box on the side that is in the way of getting in and out of the operator (the side closer to the entrance / exit) can be flipped up backward when the operator gets in and out.

  In addition, when the operator leaves the driver's seat, he / she forgets to turn off the throttle lever or gets on and off without turning off the engine key, that is, the main hydraulic pump is operated by the engine. When the operator gets on and off from the driver's seat in the state, even if the operator accidentally moves any of the operation levers for each work or is caught in clothes, the work operation levers move. It is required to prevent the possibility that the upper revolving body or the upper revolving body will turn. Therefore, after the pressure oil from the pilot hydraulic pump in the construction machine passes through the pilot valve operated by each operation lever, the pilot of the control valve for each operation of the construction machine connected to the main hydraulic pump An operation box provided with a solenoid valve between the pilot hydraulic pump and the pilot valve on the pilot line for leading to the port, and as described above, when the operator gets up and down from the driver's seat In addition, it has been conventionally proposed to provide a gate lock mechanism having a configuration in which a gate lock switch (lever operation lock switch) for operating the solenoid valve depending on the flip-up operation of the operation box is provided. Thus, when the operator flips up the operation box to get on and off from the driver's seat, the solenoid valve is changed from the state in which the pilot hydraulic pump and the pilot valve are connected to the shut-off state by the gate lock switch. By operating the operation lever so as to be, even if the operation levers are operated, the pilot pressure does not stand on the control valve for each operation of the construction machine (for example, see Patent Document 2).

  Therefore, according to the gate lock mechanism, when the operator gets on and off from the driver's seat, the operator can always get on and off without stopping the operation of the pilot operating device, so that safety can be improved.

Utility Model Registration No. 2597966 JP 2006-299620 A

  However, the deceleration device as shown in FIGS. 4 and 5 (a) (b) is effective for easily reducing the engine speed set by the throttle lever 9 to the idling state. 14 is required to be operated.

  By the way, among the construction machines, particularly in the case of a mini excavator, since there are many cases in which the operator gets off the construction machine and performs the work himself / herself, the operator frequently gets on and off the construction machine. In this case, in order to reduce the engine speed to the idling state while the operator is getting off the construction machine, it is necessary to operate the decel switch 13 provided on the operation lever 14 each time the operator gets on and off. Therefore, the actual situation is that the operation becomes complicated.

  Accordingly, the present invention provides a construction machine decel apparatus that can automatically reduce the engine speed to an idling state without requiring the operation of the decel switch when an operator works away from the construction machine for a short period of time. Is to provide.

  In order to solve the above problems, the present invention, corresponding to claim 1, is a main lever to which the other end of a first pull cable having one end connected to a throttle lever of a construction machine is connected, and an engine control And a sub-lever to which the other end of the second pull cable having one end connected to the lever is connected, and in synchronization with the rotation of the main lever via the first pull cable by the operation of the throttle lever A construction machine provided with an actuator capable of switching between a state in which the sub-lever is rotated and a state in which the tip of the sub-lever is returned to the initial position without depending on the rotation position of the main lever. In the above decelerating device, the construction machine operator is able to perform a jumping operation when getting on and off. The switch is configured to detect a flip-up operation of the operation box, and when the switch-up operation of the operation box is detected by the switch, the tip of the sub lever is returned to the initial position by the actuator. The configuration is as follows.

  In addition, a gate lock switch is used as a switch for detecting the flip-up operation of the operation box in the above configuration.

The construction machine decelerator according to the present invention exhibits the following excellent effects.
(1) The main lever connected to the other end of the first pull cable with one end connected to the throttle lever of the construction machine and the other end of the second pull cable connected to the control lever of the engine are connected. And a state in which the sub lever is rotated in synchronization with the rotation of the main lever via the first pull cable by the operation of the throttle lever, and the rotation position of the main lever. In a decelerator for a construction machine having an actuator capable of switching between a state in which the tip of the auxiliary lever is returned to the initial position without depending on the operator, the operator of the construction machine performs a jumping operation at the time of getting on and off. A switch for detecting the flip-up operation of the operation box on the fixed side of the construction machine near the center of rotation of the operation box. In this configuration, when the operation box is flipped up by the switch, the actuator is configured so that the tip of the auxiliary lever is returned to the initial position by the actuator. When the operation box is flipped up from the normal operation state to get on and off, the engine speed is automatically lowered to the idling state from the speed set by the throttle lever. Therefore, improvement in fuel consumption can be expected, and even if the operator of the construction machine frequently gets on and off, it is not necessary for the operator to perform a separate decel operation, so that the labor of the operator can be reduced. .
(2) By adopting a configuration in which a gate lock switch is used as a switch for detecting the flip-up operation of the operation box, a dedicated switch for operating the actuator in accordance with the flip-up operation of the operation box is provided. Since it is not necessary to provide a separate device, it is possible to reduce the cost and reduce the possibility that the structure of the operation box portion of the construction machine becomes complicated in order to construct the decel device shown in (1) above. .

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 and 2 show an embodiment of a construction machine decelerator according to the present invention. FIG. 1 is a schematic diagram showing the overall configuration, and FIG. 2 is a schematic diagram showing the configuration of an electric circuit. It is.

  That is, as shown in FIGS. 4 and 5 (a) (b), the main frame 1 is connected to the other end of the first pull cable 10 whose one end is connected to the throttle lever 9 of the construction machine. A lever 2 and a sub-lever 4 connected to the other end of a second pull cable 12 having one end connected to a control lever 11 of the engine; A decel motor 8 serving as an actuator for switching between a rotating state and a state in which the sub lever 4 is operated so that the control lever 11 of the engine is returned to the idling position independently of the main lever 2; In a decel apparatus having a decel switch 13 for driving the decel motor 8 at the tip of the operation lever 14, the driver seat A splash detection switch 16 that is opened and closed depending on switching between the normal use state and the flip-up operation state of the operation box 15 is provided in the operation box 15 that is designed to perform the flip-up operation when the operator gets on and off. The jump-up detection switch 16 is connected in parallel to the decel switch 13 in an electric circuit that can operate the energization of the decel motor 8 by the decel switch 13 provided on the operation lever 14. .

  More specifically, the operation box 15 has a lower end on the rear end side of the operation box 15 attached to a shaft 17 supported on a fixed bracket 18 so as to be rotatable in the vertical direction. In the upper position, the flip-up detection switch 16 is attached backward. On the other hand, on the inside of the rear end portion of the operation box 15 is an operating body for coming into contact with the flip-up detection switch 16 from the rear when returning the operation box 15 from the state in which the operation box 15 is flipped up to the normal use state. 20 is provided.

  Further, as shown in FIG. 2, the spring-up detection switch 16 is opened when the operating body 20 is in contact and closed when the operating body 20 is in a non-contact state. The decel switch 13 is connected to the key switch 21 connected to the decel motor 8 via the decel switch 13 which is normally opened and closed by the operation of the operator. And connected in parallel. Thus, in a state where the operation box 15 is not lifted up, the flip-up detection switch 16 is opened by the contact of the operating body 20 so that the deceler motor 8 is not energized via the jump-up detection switch 16. is there. On the other hand, when the operation box 15 is flipped up, the operating body 20 is separated to close the spring-up detection switch 16 so that the deceler motor 8 is energized via the spring-up detection switch 16. is there. FIG. 2 shows a state in which the flip-up detection switch 16 is closed.

  Although not shown, the operation box 15 is operated by a pilot hydraulic pump of the construction machine and an operation lever 14 depending on an operation of the operator box jumping up when getting on and off the driver's seat. A gate lock switch for operating a solenoid valve provided between the pilot valve and the pilot valve to be cut off from a state where the pilot hydraulic pump and the pilot valve are connected is provided in a conventional construction machine. It is assumed that a gate lock mechanism similar to that in FIG. Reference numeral 22 in FIG. 1 denotes a gate lock lever that becomes a handle when the operation box 15 is flipped up. Other configurations are the same as those shown in FIGS. 4 and 5 (a) and 5 (b), and the same components are denoted by the same reference numerals.

  In the construction machine equipped with the decel device having the above-described configuration, as shown by a two-dot chain line in FIG. 1, during the normal operation in which the operation box 15 is not flipped up, the flip-up detection switch 16 remains open. Therefore, in this case, when the operator operates to close the decel switch 13 of the operation lever 14 as in the conventional decelerating device shown in FIGS. Is started, the engine speed set by the throttle lever 9 is lowered to the idling state, and then when the operator operates to open the decel switch 13, the decel motor 8 is de-energized. Thus, the engine speed is restored to the original set speed set by the throttle lever 9. That.

  Further, in the construction machine, an operator pulls up the gate lock lever 22 in order to get on and off from the driver's seat, and the operation box 15 is flipped up from the normal operation state, so that a gate lock mechanism similar to the conventional one is installed. When activated, the spring-up detection switch 16 is closed, so that the decel motor 8 is energized through the spring-up detection switch 16 even when the decel switch 13 remains open. Therefore, even if the decel switch 13 is not operated, the engine simply turns up the operation box 15 and gets off the driver's seat, so that the engine speed is idled from the speed set by the throttle lever 9. It will be automatically lowered to the state. Thereafter, when the operator returns to the driver's seat of the construction machine and then lowers the gate lock lever 22 to return the operation box 15 that has been flipped up, the flip-up detection switch 16 is opened, and the decel motor 8 Since the power supply to the engine is stopped, the engine speed is automatically returned to the original set speed set by the throttle lever 9.

  As described above, according to the deceleration device of the present invention, when the operator gets on and off the driver's seat, the operation speed of the engine is controlled regardless of the position of the throttle lever 9 by the conventional operation of jumping up the operation box 15. It can be automatically lowered to the idling state. Therefore, improvement in fuel consumption can be expected, and even if the frequency of getting on and off of the operator is low, unlike the mini excavator as a construction machine, it is not necessary to operate the decel switch 13 every time the operator gets on and off. It becomes possible to reduce the labor.

  Next, FIGS. 3A and 3B show another embodiment of the present invention. In the same configuration as shown in FIGS. 1 and 2, the decel motor 8 is operated in accordance with the raising operation of the operation box 15. Instead of a configuration using a dedicated switch as the flip-up detection switch 16 for energizing the switch, it is operated by the pilot hydraulic pump 23 of the construction machine and the operation lever 14 depending on the flip-up operation of the operation box 15. In order to operate a solenoid valve 25 provided on a pilot line 24 between a pilot valve (not shown) and the pilot valve (not shown), it can be shared with a gate lock switch 16a that has been conventionally provided.

  Specifically, it is assumed that the gate lock switch 16a is attached to the operation box 15 in the same manner as the flip-up detection switch 16 shown in FIG. Further, the gate lock switch 16a is closed when the operation body 20 (see FIG. 1) is in contact with the operation box 15 in a state where the operation box 15 is not raised during normal operation of the construction machine. It is a switch of a type that is opened when the operating body 20 is brought into a non-contact state with the operation.

  As shown in FIG. 3 (a), the gate lock switch 16a is operated between the key switch 21 connected to a power source (not shown) and the solenoid valve 25 as described above. When the box 15 is in a normal operation state and the gate lock switch 16a is in a closed state, the solenoid valve 25 is energized and the solenoid is excited, so that the solenoid valve 25 The pump 23 is operated so as to be able to supply pressure oil to a pilot valve (not shown) operated by the operation lever 14. On the other hand, when the operation of the operation box 15 is raised as described above and the gate lock switch 16a is opened, the energization to the solenoid valve 25 is stopped and the solenoid is demagnetized. Pressure oil supply from the pilot pump 23 to a pilot valve (not shown) on the operation lever 14 side is cut off.

  Furthermore, in the present invention, the energization to the solenoid valve 25 is switched as described above by the opening / closing operation of the gate lock switch 16a, and at the same time, the energization to the decel motor 8 can be switched. 3A and 3B, a relay 26 having the gate lock switch 16a connected to the input terminal is provided, and one of the two output terminals of the relay 26 is connected to the solenoid 26 The valve 25 is connected, and the above-described deceleration motor 8 is connected to the other output terminal 26b.

  As shown in FIG. 3A, the relay 26 is connected to the solenoid valve 25 as described above by connecting the one output terminal 26a to the input side when the gate lock switch 16a is closed. Is energized. Therefore, during this time, the decelerating motor 8 is not energized. On the other hand, as shown in FIG. 3B, when the gate lock switch 16a is opened, the other output terminal 26b is connected to the input side, and energization to the solenoid valve 25 is stopped simultaneously. The energization of the decel motor 8 is started.

  Other configurations are the same as those shown in FIGS. 1 and 2, and the same components are denoted by the same reference numerals.

  In the construction machine equipped with the decel device having the above-described configuration, during the normal operation in which the operation box 15 is not flipped up, the gate lock switch 16a is in a closed state, so that the decel motor 8 is not energized, If the operator jumps up and down the operation box 15 to get on and off the driver's seat and activates the gate lock mechanism similar to the conventional one, the gate lock switch 16a is opened, so that the relay 25 After that, the decelerating motor 8 is energized.

  Therefore, the present embodiment can provide the same effects as those of the embodiment of FIGS.

  Further, as a switch for switching energization to the decel motor 8 in accordance with the operation of raising the operation box 15, the operation of detecting the operation box 15 is detected by a gate lock mechanism provided in a conventional construction machine. Since the gate lock switch 16a can be used, there is no need to separately provide a switch for detecting the flip-up operation of the operation box 15. Therefore, it is possible to reduce the cost, and it is possible to simplify the structure of the operation box 15 portion of the construction machine.

  The present invention is not limited to the above-described embodiment, and the flip-up detection switch 16 in the embodiment of FIGS. 1 and 2 and the embodiment of FIGS. The gate lock switch 16a may be installed in an arrangement other than that shown in FIG. 1 as long as it can detect the flip-up operation of the operation box 15, and any type of switch is adopted. Also good. Furthermore, a circuit configuration other than those shown in FIGS. 2 and 3A and 2B may be adopted as long as the decel motor 8 can be energized when the operation box 15 is flipped up.

  Further, when the operation box 15 is flipped up, it is possible to return the engine control lever 11 to the idling state regardless of the position of the throttle lever 9. The detection means for the 15 flip-up operations and the means for moving the control lever 11 may be other than those shown in the figure.

  Any construction machine other than a mini excavator may be adopted as long as the construction machine includes an operation box 15 that is configured to be flipped up when the operator gets on and off. Of course, various modifications can be made without departing from the scope of the present invention.

It is a schematic diagram showing one embodiment of a decel device of a construction machine of the present invention. It is a schematic diagram which shows the electric circuit in the apparatus of FIG. The electrical circuit in other embodiment of this invention is shown, (a) is a figure which shows the case where an operation box is in a normal driving | running | working state, (b) is a figure which respectively shows the case where an operation box is flipped up . It is a schematic diagram which shows the outline of an example of the conventionally proposed decel apparatus. FIG. 5 is an enlarged view of a sub-lever part in the decelerating device of FIG.

Explanation of symbols

2 Main lever 4 Sub lever 8 Decel motor (actuator)
9 Throttle lever 10 First pull cable 11 Control lever 12 Second pull cable 15 Operation box 16 Bounce detection switch (switch)
16a Gate lock switch (switch)

Claims (2)

  A main lever to which the other end of a first pull cable having one end connected to a throttle lever of a construction machine is connected, and a sub lever to which the other end of a second pull cable having one end connected to an engine control lever is connected. And a state in which the sub lever is rotated in synchronization with the rotation of the main lever via the first pull cable by the operation of the throttle lever, and the position depends on the rotation position of the main lever. In the construction machine decelerating apparatus having an actuator that can switch between the state in which the tip of the auxiliary lever is returned to the initial position, the operator of the construction machine can perform the jumping operation when getting on and off. A switch for detecting the flip-up operation of the operation box is provided on the fixed side of the construction machine near the center of rotation of the operation box. That a structure, when the flip-up operation of the operation box is detected by the switch, deceleration system for a construction machine, characterized in that so as to return the leading end of the auxiliary lever to the initial position by the actuator.   2. The construction machine decelerating apparatus according to claim 1, wherein a gate lock switch is used as a switch for detecting a flip-up operation of the operation box.

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