JP5999709B2 - Power source device for work machine traveling - Google Patents

Description

  The present invention relates to a traveling power source apparatus for a working machine such as a hydraulic excavator, and particularly, in an electric working machine equipped with a hydraulic power source apparatus having a hydraulic pump driven by an electric motor, traveling in a section where power cannot be supplied. It is related with a thing suitable when using it for use.

  As a working machine such as a hydraulic excavator using a main power source composed of an electric motor using a commercial power source or the like and a hydraulic pump driven by the electric motor, for example, one described in Patent Document 1 is available. A work machine using such an electric motor as a drive source of a hydraulic pump does not generate exhaust gas and is low in noise. Therefore, the work machine may be employed in a building or underground work or at night. Many. In such an electric work machine, when loading or unloading the work machine onto / from a truck for transportation at a place where commercial power or the like cannot be supplied, it has been conventionally practiced to use a large engine generator as a power source. It was.

  However, providing a large engine generator increases the burden in terms of cost and transportation. For this reason, in the electrically driven construction machine, Patent Document 2 proposes a machine that meets the demand for downsizing the auxiliary power source device. In the auxiliary power source device described in Patent Document 2, an auxiliary hydraulic pump connected to the main hydraulic circuit of the work implement is fixedly mounted on the work implement main body (upper swing body), and the auxiliary hydraulic pump is driven. The auxiliary engine is detachably mounted on the work machine body.

  This conventional auxiliary power source device is coupled to an auxiliary hydraulic pump mounted on the work machine body in order to run the work machine in places where a commercial power source or the like cannot be used or when the electric motor mounted on the work machine body fails. The auxiliary engine is connected to the main body of the work machine via the first and the auxiliary engine is operated, and the work machine is driven by the hydraulic oil discharged from the auxiliary hydraulic pump.

JP 2004-84328 A JP 2006-27345 A

  However, as disclosed in Patent Document 2, an auxiliary power source apparatus in which an auxiliary drive unit is configured by an auxiliary hydraulic pump connected to the main hydraulic circuit of the work machine body and an auxiliary engine that drives the auxiliary hydraulic pump. Installs the auxiliary engine on the work implement in places where commercial power supply cannot be used, etc., and the auxiliary hydraulic pump must always be mounted on the work implement main body. It is difficult to apply it to a small working machine because it is necessary to secure it. In addition, when the auxiliary engine is mounted, it is necessary to center the shaft with the auxiliary hydraulic pump, and there is a problem that preparation work for using the auxiliary engine is not easy.

  In view of the above problems, the present invention realizes a traveling power source device that enables traveling of a working machine in a situation where the power source device mounted on the upper swing body cannot be operated with a reduced scale, In addition, it is possible to provide a configuration that can be applied to a small working machine and that can be easily attached to and detached from the working machine.

The power source device for traveling of the work machine according to claim 1,
An upper revolving unit is installed on a lower traveling unit via a revolving device, and a power source device including a normal hydraulic pump is mounted on the upper revolving unit, and a working machine is mounted by attaching a work device to the upper revolving unit. In the power source device for
A traveling hydraulic unit is detachably attached to a track frame constituting the lower traveling body,
The traveling hydraulic unit includes a traveling engine, a traveling hydraulic pump driven by the traveling engine, and supply of discharge oil from the traveling hydraulic pump to left and right traveling hydraulic motors of the lower traveling body. A directional control valve for controlling the stop and supply directions, a traveling hydraulic pipe for supplying and discharging discharged oil from the traveling hydraulic pump to the traveling hydraulic motor, and an oil tank,
In order to supply and discharge the hydraulic oil from the service hydraulic pump to the travel hydraulic motor, the service hydraulic pipe is cut off from the service hydraulic pipe provided in the track frame, and the travel hydraulic pipe is used for the travel. It is characterized by comprising a connection changing device that is detachably connected to the hydraulic motor.

The power source device for traveling of the working machine according to claim 2 is the power source device for traveling of the working machine according to claim 1,
The traveling hydraulic unit is mounted on a carriage having tow traveling wheels.

The traveling power source device for a working machine according to claim 3 is the traveling power source device for a working machine according to claim 1 or 2,
The traveling hydraulic unit is attached to the rear portion of the track frame, and in the attached state, the traveling hydraulic unit is positioned between the left and right structures of the lower traveling body, and the rear end of the traveling hydraulic unit. Is configured to be in front of the position of the rear end of the upper swing body.

The traveling power source device for a working machine according to claim 4 is the traveling power source device for a working machine according to any one of claims 1 to 3.
The working machine is characterized in that an electric motor to which power is supplied via a cable is used as a driving machine for the regular hydraulic pump.

  According to the first aspect of the present invention, the traveling engine and the traveling hydraulic pump included in the traveling hydraulic unit are used when the power source device mounted on the upper swing body of the work machine cannot be operated. Because it is dedicated, it is smaller than the conventional one that supplies hydraulic oil to all hydraulic actuators of the work equipment. Further, since not only the traveling engine but also the traveling hydraulic pump is included in the traveling hydraulic unit and is detachably attached to the track frame, a part of the dedicated power source device for traveling or the It is not necessary to install all of them, and it can be applied to a small working machine.

  In addition, when the traveling hydraulic unit is used, the traveling engine and the traveling hydraulic pump can be used as they are, so that there is no need to center the shaft of the traveling engine and the traveling hydraulic pump. Work required for attaching and detaching the unit becomes easy.

  According to the second aspect of the present invention, since the traveling hydraulic unit is configured to be a towing type with wheels, the traveling hydraulic unit is attached to the lower traveling body by the operator's force without using a transporting vehicle such as a forklift. It can be moved to a position or pulled out from the mounting position, and it becomes easier to attach to and detach from the work machine.

  According to the invention of claim 3, the traveling hydraulic unit is accommodated between the left and right structures of the rear portion of the lower traveling body, and the rear end of the traveling hydraulic unit is located at the position of the rear end of the upper swing body. Since it is configured to be in front, the traveling hydraulic unit fits compactly in the lower space of the upper revolving structure, and the traveling hydraulic unit may interfere with obstacles when traveling, loading or unloading on a truck There is no. In addition, when a traveling hydraulic unit is mounted on a truck, the traveling hydraulic unit will fit within the front / rear length of the work equipment during transportation, and will not protrude sideways from the work equipment. It becomes easier to clear the restrictions.

  According to the invention of claim 4, in the case of an electric working machine, it is possible to perform loading and unloading on a transfer truck even in a place without a power source, such as a factory or work site having a power source. It can be suitably used when the operation place and the loading / unloading place are separated from each other.

It is a side view which shows an example of the working machine to which the motive power source device of this invention is applied. (A) is a partial cross-sectional side view showing an embodiment of a travel power source device of the present invention, (B) is a side cross-sectional view showing a mounting portion of the travel hydraulic unit with respect to the center frame, and (C) It is side surface sectional drawing which shows the attaching part with respect to the side frame of the hydraulic unit for driving | running | working. FIG. 3A is a partially sectional rear view of FIG. 2, and FIG. It is an electrohydraulic circuit diagram of the driving power source device of this embodiment. It is a partial cross section side view which shows other embodiment of the driving power source device of this invention. FIG. 6 is a plan view of FIG. 5.

  FIG. 1 is a side view showing an example of a working machine to which a traveling power source device of the present invention is applied. This working machine constitutes a hydraulic excavator, and a turning frame 3a is installed on a lower traveling body 1 via a turning device 2, and a main power source device 4, an operator cab 5 and a counterweight 6 are installed on the turning frame 3a. Etc. are mounted to constitute the upper swing body 3. The working device 7 is attached to the revolving frame 3a. The working device 7 includes a boom 9 that is raised and lowered by a hydraulic cylinder 8, an arm 11 that is rotatably attached to the tip of the boom 9 by a hydraulic cylinder 10, and a bucket that is rotatably attached to the tip of the boom by a hydraulic cylinder 12. 13

  As shown in the side sectional view of FIG. 2A and the rear view of FIG. 3A, the track frame 15 constituting the lower traveling unit 1 is installed on the center frame 15a on which the turning device 2 is installed, and on the left and right sides thereof. Side frame 15b. As shown in FIG. 1, at the rear end portion of the side frame 15b, a drive wheel 17 driven by a traveling hydraulic motor 16, a driven wheel 18 attached to the front end portion of the side frame 15b, the drive wheel 17 and the slave wheel. And a crawler belt 19 hung around the driving wheel 18.

  The main power source device 4 has a configuration for driving an ordinary hydraulic pump 21 (see FIG. 4) and a pilot hydraulic pump (not shown) driven by using an electric motor 20 (see FIG. 4) as a drive source. The traveling hydraulic motor 16 used in this working machine, the hydraulic motor (not shown) of the turning device 2, the hydraulic cylinders 8, 10, 12, etc. of the working device 7 are operated by the hydraulic oil discharged from the hydraulic pump 21.

  The electric motor 20 that drives the regular hydraulic pump 21 provided in the main power source device 4 is driven by a commercial power source or a power source by a permanent generator at a place where a work machine such as a factory is operated. In this embodiment, as shown in FIG. 1, the power supply system for supplying power to the electric motor 20 includes a cable 22 connected to a power source (not shown), a connector 23 attached to the side surface of the side frame 15b, and a swivel device. The example comprised by the center joint 24 provided in 2 is shown. A connector for connecting the cable 22 may be provided on the center frame 15a, and the cable 22 may be connected to the upper swing body 3 via a swivel connection device (not shown).

  2A and 3A, reference numeral 26 denotes a traveling hydraulic unit, 27 denotes a box serving as an exterior body of the traveling hydraulic unit 26, and the box 27 is connected to the truck frame 15 on the traveling hydraulic unit. 26 is provided for detachably mounting.

  As shown in the electrohydraulic circuit diagram of FIG. 4, the traveling hydraulic unit 26 is configured to travel to the traveling engine 28, the traveling hydraulic pump 29 driven by the engine 28, and the left and right traveling hydraulic motors 16. A direction switching valve 30 that controls supply, stop, and supply direction of the discharge oil from the hydraulic pump 29 and an oil tank 31 are provided. In this embodiment, since the remote operation is performed wirelessly, an operation transmitter (portable operation device) 33 provided by the operator is provided, and the traveling hydraulic unit 26 is operated by the operation from the transmitter 33. A receiver 34 for receiving the signal, a control circuit 35 for controlling the direction switching valve 30 and the traveling engine 28 and the like by the operation signal received by the receiver 34, and a battery serving as a power source for the receiver 34 and the control circuit 35, etc. 36.

  In FIG. 4, 38 is a traveling direction switching valve installed on the turning frame 3a, 39 is a regular hydraulic pipe attached on the track frame 15, and this regular hydraulic pipe 39 is connected to the center joint 24 and the traveling frame. The hydraulic motor 16 is connected. Reference numeral 40 denotes a traveling hydraulic pipe provided in the traveling hydraulic unit 26, and the traveling hydraulic motor 16 from the traveling hydraulic pump 29 of the traveling hydraulic unit 26 in a place where power cannot be supplied to the electric motor 20 via a cable. The hydraulic oil is supplied to and discharged from the tank.

  Reference numeral 41 denotes a connection changing device provided for switching the hydraulic oil supply piping for the traveling hydraulic motor 16 between the regular hydraulic piping 39 and the traveling hydraulic piping 40. The connection switching device 41 of this embodiment includes a stop valve 42 that shuts off the normal hydraulic piping 39, a chee 43 provided between the stop valve 42 and the traveling hydraulic motor 16, and the chee 43 It comprises a joint 44 for attaching and detaching the traveling hydraulic pipe 40.

  2A and 3A, reference numeral 46 denotes an attachment portion for attaching the front portion of the box 27 to the center frame 15a, and reference numeral 47 denotes an attachment portion for attaching the side portion of the box 27 to the side frame 15b. Among these, as shown in FIG. 2 (B), the attachment portion 46 at the front portion of the box 27 includes an attachment piece 27a provided to project forward from the top of the center of the front portion of the box 27, and the attachment piece 27a. In order to connect, it consists of a receiving portion 15c that protrudes rearward from the center of the rear portion of the center frame 15a. The receiving portion 15c and the attachment piece 27a have through holes 27b and 15d for inserting the fixing pins 48, respectively. Reference numeral 49 denotes a retaining pin such as a beta pin for retaining the fixing pin 48.

  As shown in FIGS. 2 (C) and 3 (B), the attachment portion 47 for attaching the side portion of the box 27 to the side frame 15b is a cylindrical portion 27d protruding sideways on the upper portion of the side plate portion 27c of the box 27. And the latch plate 50 is slidably fitted to the cylindrical portion 27d. The cylindrical portion 27d and the locking plate 50 are provided with through holes 27e and 50a into which the fixing pins 51 are detachably inserted. At the end of the locking plate 50 on the box 27 side, there is provided an operation rising portion 50b for projecting and retracting the locking plate 50 as shown by an arrow X (see FIG. 3B). Reference numeral 51 a denotes a retaining spring provided on the pin 51.

  The traveling hydraulic unit 26 is used by being attached to the track frame 15 when a commercial power source cannot be used or when the electric motor 20 or the like fails. That is, as shown by a two-dot chain line in FIG. 3B, the locking plate 50 is set in a retracted state so as not to protrude from the cylindrical portion 27d, and the left and right side walls are moved by a forklift or the like together with the box 27 containing the unit 26. While being carried between the frames 15b and 15b, the mounting piece 27a at the front portion of the box 27 is positioned on the receiving portion 15c. Then, the rising portion 50b of the locking plate 50 is grasped by hand, and as shown in FIG. 3B, the locking plate 50 is moved from the retracted state indicated by the two-dot chain line, as shown by the solid line 27d. Let it be in a state of projecting to the side. In this protruding state, the rising portion 50b of the locking plate 50 is in contact with the end of the cylindrical portion 27d, and the locking plate 50 is positioned on the side frame 15b.

  Then, the loading platform of the forklift is lowered, and as shown in FIG. 2 (B), the position of the through hole 27b provided in the mounting piece 27a and the position of the through hole 15d provided in the receiving portion 15c are aligned, and the pin 48 is inserted into these. By attaching a retaining pin 49 such as a beta pin to the pin 48, the front portion of the box 27 is detachably connected to the center frame 15a. 3B, the locking plate 50 is placed on the side frame 15b, and the pins 51 are inserted into the through holes 50a and 27e provided in the locking plate 50 and the cylindrical portion 27d, respectively. Thus, the locking plate 50 is prevented from being detached from the side frame 15b.

  In the state where the traveling hydraulic unit 26 is attached to the track frame 15 as described above, the traveling hydraulic unit 26 includes the box 27 as shown in FIGS. 2 (A) and 3 (A). It is located between the side frames 15 b that are the left and right structures of the body 1, and the rear end of the box 27 is located forward of the rear end of the upper swing body 3. That is, the box 27 does not protrude backward from the rear end of the upper swing body 3. In this embodiment, the size of the box 27 is further reduced so that the rear end of the box 27 does not protrude from the rear end of the crawler belt 19.

  In this way, the traveling hydraulic unit 26 is attached to the track frame 15 of the working machine, and the operator operates the stop valve 42 shown in FIGS. Cut off. Further, the joint 44 is connected to the hee 43 and the traveling hydraulic pipe 40 is connected to the traveling hydraulic motor 16. Then, the operator operates the portable transmitter 33 to cause the receiver 34 to receive an operation signal. The receiver 34 transmits the received signal to the control circuit 35, and the control circuit 35 starts the engine 28 and controls the direction switching valve 30 according to the signal from the operator, and the hydraulic oil from the traveling hydraulic pump 29. Thus, the traveling hydraulic motor 16 is operated to cause the work machine to travel.

  As described above, the power source device for traveling according to this embodiment is a power source device in which the traveling engine 28 and the traveling hydraulic pump 29 included in the traveling hydraulic unit 26 are mounted on the upper swing body 3 of the working machine. Since it is exclusively used for running when 4 cannot operate, it is smaller than the conventional one that supplies hydraulic oil to all hydraulic actuators of the work equipment. Further, not only the traveling engine 28 but also the traveling hydraulic pump 29 is included in the traveling hydraulic unit 26 and is detachably attached to the track frame 15. This is applicable to a small work machine.

  Further, when the traveling hydraulic unit is used, the traveling engine 28 and the traveling hydraulic pump 29 can be used as they are, so that it is not necessary to attach and detach the traveling engine 28 and the traveling hydraulic pump 29. Since there is no need for centering, the work required for attaching and detaching the traveling hydraulic unit 26 is facilitated.

  In addition, the traveling hydraulic unit 26 is located between the side frames 15b and the crawler belts 19 that are the left and right structures of the lower traveling body 1 including the box 27 that is the exterior body, and the traveling hydraulic unit 26 includes the box 27. Since the rear end of the hydraulic unit 26 is configured to be ahead of the position of the rear end of the upper swing body 3, the traveling hydraulic unit 26 can be accommodated in a compact space in the lower space of the upper swing body 3. For this reason, there is no possibility that the traveling hydraulic unit 26 interferes with an obstacle when the working machine travels or is loaded onto or unloaded from the transport truck. In addition, when the traveling hydraulic unit 26 is mounted on the transport truck, the traveling hydraulic unit 26 may fit within the longitudinal length of the work implement during transportation and may protrude sideways from the work implement. It is easier to clear the restrictions on transportation.

  The traveling power source apparatus of the present invention can also be applied to a work machine equipped with an engine-driven hydraulic pump. However, as in the work machine described in this embodiment, an electric power source that uses a commercial power source as a power source. If it is a driven work machine, it can be loaded and unloaded on a transport truck even in a place where there is no commercial power supply, and it can be loaded or loaded into a work place such as a factory with power supply and a transport truck. It can be suitably used when the place for lowering is separated.

  In the above embodiment, the pins 48 and 51 are used as means for attaching the box 27 to the track frame 15, but other connecting means such as bolts and nuts and attachment structures may be used. Moreover, it is good also as a structure fixed with fixing tools, such as a pin and a bolt, instead of mounting the box 27 on the side frame 15b. Further, as the connection switching device 41, a part or all of the connection switching device 41 may be replaced with a direction switching valve instead of the stop valve 42 and the chi 43. Further, as a method of operating the traveling hydraulic unit 26, a wired operation device may be used instead of a wireless method.

  FIG. 5 is a side view showing another embodiment of the traveling power source apparatus of the present invention, and FIG. 6 is a plan view thereof. 5 and 6, the same reference numerals as those in FIGS. 1 to 4 denote components or parts having the same functions. In this embodiment, the traveling hydraulic unit 26 is pulled by a work machine. That is, a carriage 53 is configured by attaching a wheel 52 to a box 27 that accommodates the traveling hydraulic unit 26, and a connecting member 54 for towing is provided at the front portion of the box 27, and this connecting member 54 is provided on the center frame 15a. The receiving portion 15c is detachably connected by a connection pin 55.

  In this embodiment, since the traveling hydraulic unit 26 is mounted on the carriage 53, when the traveling hydraulic unit 26 is moved to the working machine or separated from the working machine, a transport vehicle such as a forklift is not used. Since the worker can move the traveling hydraulic unit 26 together with the carriage 53 by hand pushing or towing, the traveling hydraulic unit 26 can be easily attached to and detached from the working machine. The carriage 53 may be configured to move this via a pulling member such as a rope or a handle such as a rod.

  The working machine to which the present invention is applied includes not only a hydraulic excavator but also a machine in which another working device such as a crushing tool, a dismantling tool, a gripping tool, or a loading platform is attached instead of the bucket 13, The boom 9 and the arm 11 may be partly or entirely attached with a telescopic arm or a left / right swing structure arm. Moreover, when implementing this invention, a various change and addition are possible not only in the said embodiment but in the range which does not deviate from the summary of this invention.

1: Lower traveling body, 2: Turning device, 3: Upper turning body, 3a: Turning frame, 4: Main power source device, 7: Working device, 15: Track frame, 15a: Center frame, 15b: Side frame, 16 : Traveling hydraulic motor, 20: electric motor, 21: service hydraulic pump, 22: cable, 23: connector, 24: center joint, 26: traveling hydraulic unit, 27: box, 27a: mounting piece, 27d: cylindrical Part: 28: traveling engine, 29: traveling hydraulic pump, 30: direction switching valve, 31: oil tank, 33: transmitter, 34: receiver, 35: control circuit, 36: battery, 38: traveling direction Switching valve, 39: Regular hydraulic piping, 40: Travel hydraulic piping, 41: Connection switching device, 42: Stop valve, 43: Qi, 44: Fitting, 46, 47: Mounting part, 48, 51: Solid Use pins, 50: locking plate, 52: wheel, 53: carriage, 54: connecting member, 55: connection pin

Claims (4)

An upper revolving unit is installed on a lower traveling unit via a revolving device, and a power source device including a normal hydraulic pump is mounted on the upper revolving unit, and a working machine is mounted by attaching a work device to the upper revolving unit. In the power source device for
A traveling hydraulic unit is detachably attached to a track frame constituting the lower traveling body,
The traveling hydraulic unit includes a traveling engine, a traveling hydraulic pump driven by the traveling engine, and supply of discharge oil from the traveling hydraulic pump to left and right traveling hydraulic motors of the lower traveling body. A directional control valve for controlling the stop and supply directions, a traveling hydraulic pipe for supplying and discharging discharged oil from the traveling hydraulic pump to the traveling hydraulic motor, and an oil tank,
In order to supply and discharge the hydraulic oil from the service hydraulic pump to the travel hydraulic motor, the service hydraulic pipe is cut off from the service hydraulic pipe provided in the track frame, and the travel hydraulic pipe is used for the travel. A traveling power source device for a working machine, comprising a connection changing device detachably connected to a hydraulic motor. In the power source device for traveling of the work machine according to claim 1,
A traveling power source apparatus for a working machine, wherein the traveling hydraulic unit is mounted on a carriage having tow traveling wheels. In the power source device for traveling of the work machine according to claim 1 or 2,
The traveling hydraulic unit is attached to the rear portion of the track frame, and in the attached state, the traveling hydraulic unit is positioned between the left and right structures of the lower traveling body, and the rear end of the traveling hydraulic unit. A power source device for traveling of a working machine, wherein the power source device is configured to be in front of a position of a rear end of the upper swing body. In the motive power source device for the working machine according to any one of claims 1 to 3,
A working power source device for a working machine, wherein the working machine uses an electric motor to which power is supplied via a cable as a driving machine for the normal hydraulic pump.

Images