JP2012067627A - Hydraulic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic device which drives a hydraulic working machine mounted on a vehicle, and which does not produce exhaust gas and is less noisy.SOLUTION: A first hydraulic device 10 includes a first oil feed path 11 for feeding oil to a first hydraulic pump 12 driven by an engine 16, and a first output oil path 13 for outputting hydraulic pressure generated by the first hydraulic pump 12. A second hydraulic device 20 includes a second oil feed path 21 branching off from a branching point P1 of the first oil feed path 11 to feed oil to a second hydraulic pump 22 driven by an electric motor 25, and a second output oil path 23 which outputs hydraulic pressure generated by the second hydraulic pump 22 and is joined by the first output oil path 13 via a confluent point P2. At a place where a three-phase electric power supply 27 can be ensured, the second hydraulic pump 22 is driven by the electric motor 25 to actuate a crane 30 by the hydraulic pressure.

Description

  The present invention relates to a hydraulic apparatus that is mounted on a truck or a ship and drives a hydraulic working machine such as a crane that is used for lifting and unloading luggage.

  A crane is well known as a hydraulic working machine that is mounted on vehicles such as trucks and ships and used for lifting and unloading (loading) cargo. Cranes mounted on trucks are called on-board cranes, and can be used for convenience because the cranes installed in the vehicle can lift and unload loads even when there are no crane facilities in the factory or warehouse. (For example, refer to Patent Document 1).

  In-vehicle cranes generally use an engine used for running a truck as a power source. The hydraulic pump is moved by the rotation of the engine, and the jack and crane are driven by the hydraulic pressure generated by the hydraulic pump. That is, jacking up, boom turning / undulation / extension / contraction, and lifting / lowering of the winch are performed by hydraulic pressure, thereby lifting and lowering the cargo to a predetermined place. When the weight of the load suspended by the winch is large, a large force is generated by increasing the engine speed.

JP-A-9-315778

However, since the power source is an engine in the above-described on-vehicle crane, it is necessary to always rotate the engine during the lifting and unloading work of the load. For this reason, exhaust gas is always generated during the work. There is a problem that it is generated and the noise is large. In addition, when the load to be lifted and unloaded is heavy, it is necessary to increase the engine speed as described above, so that both the amount of exhaust gas generated and the noise increase. For example, in the case of a truck having a load capacity of 4 tons, it takes about 1 hour to lift and unload a load that can be loaded on the truck. During this time, exhaust gas and noise are generated, and CO ₂ is also discharged. For this reason, the operator who operates the crane is forced to work in an environment where exhaust gas and noise continue to be generated. Especially, when working indoors such as in a factory, the amount of exhaust gas is large, and noise Tend to be bigger.

  In the above description, the hydraulic device for the on-board crane mounted on the truck has been described as the hydraulic device. This also occurs in the hydraulic device that drives the motor.

  The present invention has been made in view of the above-described circumstances, and provides a hydraulic device that drives a hydraulic working machine mounted on a vehicle, which does not generate exhaust gas and that has low noise. It is for the purpose.

  According to the first aspect of the invention, the hydraulic working machine mounted on the vehicle is attached in addition to the first hydraulic device that is driven by the hydraulic pressure generated by the first hydraulic pump using the engine as a power source. The hydraulic apparatus includes a second hydraulic pump that uses an electric motor as a power source and is arranged in parallel with the first hydraulic pump to drive the hydraulic working machine by hydraulic pressure, and alternatively to the first hydraulic apparatus. It can be used by switching.

  According to a second aspect of the present invention, in the second hydraulic device according to the first aspect, the first supply oil passage for supplying oil to the first hydraulic pump of the first hydraulic device, and the first hydraulic pump A second supply oil passage that branches from a branch point of the first supply oil passage to supply oil to the second hydraulic pump with respect to a first output oil passage that outputs the generated hydraulic pressure; and the second hydraulic pump And a second output oil passage that joins the first output oil passage through a junction.

  According to the invention according to claim 3, in the second hydraulic device according to claim 2, the first hydraulic valve in the first output oil passage has a first check valve between the joining point, A second check valve is provided between the second hydraulic pump and the junction in the second output oil passage.

  According to a fourth aspect of the present invention, there is provided a hydraulic apparatus for driving a hydraulic working machine mounted on a vehicle by hydraulic pressure, a first hydraulic apparatus having a first hydraulic pump having an engine as a power source, and an electric motor as a power source. A second hydraulic device having a second hydraulic pump arranged in parallel with the first hydraulic pump, and the first hydraulic device and the second hydraulic device can be switched selectively for use. It is characterized by that.

  The invention according to claim 5 is the hydraulic device according to claim 4, wherein the first hydraulic device is generated by a first supply oil passage for supplying oil to the first hydraulic pump and the first hydraulic pump. A first output oil passage that outputs hydraulic pressure, and the second hydraulic device is branched from a branch point of the first supply oil passage and supplies oil to the second hydraulic pump; And a second output oil passage that outputs the hydraulic pressure generated by the second hydraulic pump and joins the first output oil passage through a junction.

  The invention according to claim 6 is the hydraulic device according to claim 5, further comprising a first check valve between the first hydraulic pump and the junction in the first output oil passage, and the second output. A second check valve is provided between the second hydraulic pump and the junction in the oil passage.

  According to the invention of claim 1, when the second hydraulic device has a power source, the hydraulic working machine can be driven by the second hydraulic pump that uses the electric motor as a power source. Unlike the case where the engine is used as a power source, no exhaust gas is generated, and noise can be reduced as compared with the case where the engine is used as a drive source.

  According to the invention of claim 2, the second hydraulic device can be easily added in parallel to the existing first hydraulic device. That is, the second hydraulic device includes a second supply oil passage that branches a second hydraulic pump that uses an electric motor as a power source from a first supply oil passage on the first hydraulic pump side that uses an engine as a power source, and the first It can arrange | position in parallel with respect to a 1st hydraulic pump via the 2nd output oil path which merges with an output oil path. In other words, the second hydraulic device can be easily attached to the first hydraulic device by adding the second hydraulic pump via the second supply oil passage and the second output oil passage.

  According to the invention of claim 3, the second hydraulic device is provided from the first hydraulic pump to the second hydraulic pump by providing the first check valve and the second check valve without providing any special switching device. Can be used by switching. That is, by providing the first check valve and the second check valve, when one of the first hydraulic pump and the second hydraulic pump is used, oil flows automatically to the other. Is prevented.

  According to the fourth aspect of the present invention, the vehicle can be driven by the engine, and the hydraulic device can be driven by the second hydraulic pump using the electric motor of the second hydraulic device as a power source in a place where the power source can be secured. The hydraulic working machine can be driven by a first hydraulic pump that uses the engine of the first hydraulic device as a power source in a place where a power supply cannot be secured. And when using a 2nd hydraulic device, while eliminating generation | occurrence | production of exhaust gas, a noise can be reduced compared with the case where a 1st hydraulic device is used.

  According to the invention of claim 5, the hydraulic apparatus can arrange the first hydraulic apparatus and the second hydraulic apparatus in parallel with a simple configuration.

  According to the invention of claim 6, the hydraulic device is provided with the first check valve and the second check valve, so that the first hydraulic device and the second hydraulic device can be selected without providing a special switching device. Can be switched and used.

1 is a hydraulic circuit diagram of an entire hydraulic device 1. FIG. It is a figure which shows typically the principal part of the hydraulic circuit diagram shown in FIG. It is a figure explaining operation | movement of the crane 30 as a hydraulic working machine.

Hereinafter, embodiments to which the present invention is applied will be described in detail with reference to the drawings. In addition, in each drawing, the member etc. which attached | subjected the same code | symbol are the things of the same or similar structure, The duplication description about these shall be abbreviate | omitted suitably. Moreover, in each drawing, members and the like that are not necessary for the description are omitted as appropriate.
<Embodiment 1>

  With reference to FIGS. 1-3, the hydraulic apparatus 1 which concerns on Embodiment 1 to which this invention is applied is demonstrated. Here, FIG. 1 is a hydraulic circuit diagram of the entire hydraulic device 1. FIG. 2 is a diagram schematically showing a main part of the hydraulic circuit diagram shown in FIG. FIG. 3 is a diagram for explaining the operation of the crane 30 as a hydraulic working machine.

  In the following description, a case where the hydraulic working machine driven by the hydraulic device 1 is an in-vehicle crane 30 mounted on a truck T as a vehicle will be described as an example. As a hydraulic working machine, For example, a crane mounted on a fishing boat or a cargo ship, a compressor mounted on a concrete pump truck, or the like may be used.

  As shown in FIGS. 1 and 2, the hydraulic device 1 includes a first hydraulic device 10 and a second hydraulic device 20, and drives a crane 30 mounted on a truck T.

  The crane 30 is demonstrated with reference to FIG.

  The crane 30 has a jack J that floats the front wheel to fix the truck T when lifting (unloading) a load (not shown) with respect to the loading platform L, and can be rotated 360 degrees (in the direction of arrow R1), can be raised and lowered (in the direction of arrow R2), and can be extended ( A boom B that is in the direction of arrow R3, a winch W that is suspended from the tip of the boom B and that lifts and lowers the load (in the direction of arrow R4), and a turntable R that turns the boom B (see FIG. 1). Further, as shown in FIG. 1, the crane 30 includes, as hydraulic actuators, lifting cylinders 31 and 31 for raising and lowering the jack J, a two-way turning motor 32 for turning the turntable R, and a hoisting for raising and lowering the boom B. A cylinder 33, a two-way lift motor 34 that lifts and lowers the winch W, and a telescopic cylinder 35 that extends and retracts the boom B are provided. Further, the crane 30 operates as the operation valves 40 for operating the hydraulic actuators described above, as the operation valves 41 and 41 for the elevating cylinders 31 and 31, the operation valve 42 for the swing motor 32, and the operation valve for the hoisting cylinder 33. 43, an operation valve 44 for the lifting motor 34 and an operation valve 45 for the telescopic cylinder 35 are provided. These operation valves 41-45 are comprised by the 4 port 3 position switching valve, for example. The operation valves 41 to 45 can be operated directly by operating the levers or can be electrically operated via a switch or the like of an operation panel (not shown).

  As shown in FIGS. 1 and 2, the first hydraulic device 10 includes a first supply oil passage 11, a first hydraulic pump 12, a first output oil passage 13, and a first check valve (first check valve). ) 14.

  The first supply oil passage 11 is an oil passage connecting the oil tank 15 in which the hydraulic oil is stored and the first hydraulic pump 12, and a branch point where a second supply oil passage 21, which will be described later, is branched in the middle. P1 is provided.

  The first hydraulic pump 12 is a hydraulic pump that uses the engine 16 as a power source. The engine 16 is used when the truck T is run. During crane operation (loading and unloading), the power generated by the engine 16 is a transmission and a power take (both not shown). Is used to drive the first hydraulic pump 12. The engine 16 is connected to the battery 17 of the track T via a switch 50 described later.

  The first output oil passage 13 is an oil passage that supplies the hydraulic pressure generated by the first hydraulic pump 12 to the operation valves 41 to 45 described above via an internal pilot type sequence valve (pressure adjustment valve) 18. is there. The first output oil passage 13 is provided with a joining point P2 where a later-described second output oil passage 23 joins the upstream side of the sequence valve 18.

  The first check valve 14 is provided between the first hydraulic pump 12 and the junction P2 in the first output oil passage 13, and prevents the backflow of hydraulic pressure. That is, when the hydraulic pressure on the downstream side of the first check valve 14 becomes higher than the hydraulic pressure on the upstream side, the first output oil passage 13 is closed so that the hydraulic pressure does not flow backward.

The second hydraulic device 20 is arranged in parallel with the first hydraulic device 10 described above.
The second hydraulic device 20 includes a second supply oil passage 21, a second hydraulic pump 22, a second output oil passage 23, and a second check valve (second check valve) 24. .

  The second supply oil passage 21 is an oil passage that connects the branch point P <b> 1 of the first supply oil passage 11 and the second hydraulic pump 22.

  The second hydraulic pump 22 is a pump that uses the electric motor 25 as a power source. For example, a three-phase AC motor is used as the electric motor 25, and the electric motor 25 is connected to a three-phase power source (200 V outlet) 27 in a factory to which the cargo is unloaded. A switch 50 is provided in the middle of the power cord 26.

  The switch 50 has a power cord storage shutter 51. The power cord storage shutter 51 can move between a closed position (closed state) A1 indicated by a two-dot chain line in FIG. 1 and an open position (open state) A2 indicated by a solid line. The power cord storage shutter 51 is disposed at the closed position A1 when the power cord 26 is stored in a predetermined storage portion (not shown). In this closed state, the power cord 26 cannot be used, and therefore the electric motor 25 cannot be used. On the other hand, in this closed state, the engine 16 and the battery 17 on the second hydraulic device 20 side are electrically connected via the conducting wire 19 and the switch 50, and the engine 16 can be used. That is, when the power cord storage shutter 51 is closed, the electric motor 25 cannot be used, and only the engine 16 can be used.

  On the other hand, when the power cord storage shutter 51 is opened and opened, the power cord 26 can be taken out from the storage portion. If the taken power cord 26 is inserted into the three-phase power source 27, the electric motor 25 Can be used. On the other hand, in the open state, the connection between the engine 16 and the battery 17 is interrupted by the power cord storage shutter 51, so that the engine 16 cannot be used. That is, in the open state of the power cord storage shutter 51, the engine 16 cannot be used, and only the electric motor 25 can be used.

  As described above, by providing the switch 50, when one of the engine 16 and the electric motor 25 can be used, the other cannot be used, and only so-called alternative use is possible. Thereby, it is possible to prevent a malfunction in which both the engine 16 and the electric motor 25 are erroneously used.

  The second output oil passage 23 is an oil passage connecting the second hydraulic pump 22 and the merging point P2 of the first output oil passage 13 described above, and the hydraulic pressure generated by the second hydraulic pump 22 is changed to the merging point. It supplies to P2.

  The second check valve 24 is provided between the second hydraulic pump 22 and the junction P2 in the second output oil passage 23, and prevents a backflow of hydraulic pressure. That is, when the hydraulic pressure on the downstream side of the second check valve 24 becomes higher than the hydraulic pressure on the upstream side, the second output oil passage 23 is closed so that the hydraulic pressure does not flow backward.

  According to the hydraulic device 1 having the above configuration, the crane 30 as a hydraulic working machine can be driven by the second hydraulic pump 22 using the electric motor 25 as a power source in a place where the three-phase power source 27 can be secured. Therefore, in this case, unlike the case where the engine 16 is used as a power source, no exhaust gas is generated, and noise can be reduced as compared with the case where the engine 16 is used as a drive source. In particular, when the engine 16 is used indoors, such as in a factory, it is difficult to provide sufficient ventilation, and indoor air is contaminated by exhaust gas, so that an electric motor that does not generate exhaust gas is used. It is extremely effective to use 25 as a power source.

  Further, by providing the switch 50 as described above, the engine 16 and the motor 25 can be used only alternatively, so there is no possibility that both are used at the same time.

  Further, by providing the first check valve 14 and the second check valve 24 as described above, the first hydraulic pump 12 using the engine 16 as a power source and the second hydraulic pump using the electric motor 25 as a power source. There is no need to provide a switching mechanism for switching between the two. That is, when the first hydraulic pump 12 is driven by the engine 16 of the first hydraulic device 10, the first check valve 14 is opened, and the hydraulic pressure at the junction P2 becomes higher than the hydraulic pressure at the branch point P1. As a result, in the second hydraulic device 20, the second check valve 24 is closed and the flow of hydraulic pressure is stopped. Here, when the engine 16 is stopped and the second hydraulic pump 22 is driven by the electric motor 25 of the second hydraulic device 20, the second check valve 24 is opened, and the hydraulic pressure at the branch point P1 is greater than that at the junction P2. Hydraulic pressure is higher. Thereby, in the 1st hydraulic device 10, the 1st check valve 14 is closed and the flow of oil pressure is stopped. That is, the first hydraulic pump 12 and the second hydraulic pump 22 can be properly used with a simple configuration such as the first check valve 14 and the second check valve 24 without providing a special switching mechanism. is there.

  In the above description, an example in which the hydraulic device 1 according to the present invention is configured by the first hydraulic device 10 and the second hydraulic device 20 has been described. However, the present invention relates to the existing first hydraulic device 10 according to the present invention. A second hydraulic device 20 may be added and arranged in parallel. However, in this case, the first check valve 14 that is not particularly necessary only with the existing first hydraulic device 10 is attached to the first hydraulic device 10 as a part of the configuration to be added.

  In the above description, the example in which the three-phase power source 27 is used as the power source has been described in order to increase the output of the electric motor 25 and, consequently, the capacity of the second hydraulic pump 22. Instead, it is also possible to use an electric motor that uses DC 100V for home use as a power source.

DESCRIPTION OF SYMBOLS 1 Hydraulic apparatus 10 1st hydraulic apparatus 11 1st supply oil path 12 1st hydraulic pump 13 1st output oil path 14 1st check valve 16 Engine 20 2nd hydraulic apparatus 21 2nd supply oil path 22 2nd hydraulic pump 23 Second output oil passage 24 Second check valve 25 Electric motor 30 Crane (hydraulic working machine)
P1 Junction point P2 Junction point T Track (vehicle)

Claims (6)

In the second hydraulic device attached to the first hydraulic device driven by the hydraulic pressure generated by the first hydraulic pump using the engine as a power source, the hydraulic working machine mounted on the vehicle is attached.
An electric motor is used as a power source, and a second hydraulic pump that is arranged in parallel with the first hydraulic pump and drives the hydraulic working machine by hydraulic pressure is provided, and is used by selectively switching to the first hydraulic device. obtain,
The 2nd hydraulic device characterized by the above-mentioned. For a first supply oil passage that supplies oil to the first hydraulic pump of the first hydraulic device and a first output oil passage that outputs the hydraulic pressure generated by the first hydraulic pump,
A second supply oil passage that is branched from a branch point of the first supply oil passage and supplies oil to the second hydraulic pump;
A second output oil passage that outputs the hydraulic pressure generated by the second hydraulic pump and is joined to the first output oil passage through a junction.
The second hydraulic device according to claim 1, wherein: A first check valve between the first hydraulic pump and the junction in the first output oil passage;
A second check valve is provided between the second hydraulic pump and the junction in the second output oil passage;
The second hydraulic device according to claim 2, wherein: In a hydraulic device that drives a hydraulic working machine mounted on a vehicle by hydraulic pressure,
A first hydraulic device having a first hydraulic pump powered by an engine;
An electric motor as a power source, and a second hydraulic device having a second hydraulic pump arranged in parallel to the first hydraulic pump,
The first hydraulic device and the second hydraulic device can be selectively switched and used.
A hydraulic device characterized by that. The first hydraulic device includes a first supply oil passage that supplies oil to the first hydraulic pump, and a first output oil passage that outputs the hydraulic pressure generated by the first hydraulic pump,
The second hydraulic device outputs a hydraulic pressure generated by the second hydraulic pump that is branched from a branch point of the first hydraulic fluid path and supplies oil to the second hydraulic pump, and the second hydraulic pump. And a second output oil passage that joins the first output oil passage via a junction.
The hydraulic apparatus according to claim 4. A first check valve between the first hydraulic pump and the junction in the first output oil passage;
A second check valve is provided between the second hydraulic pump and the junction in the second output oil passage;
The hydraulic apparatus according to claim 5.

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