JP2002241080A - Hydraulic power unit-mounted truck crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic oil power unit system-mounted truck crane having superior stability, lifting capacity, and narrow place approaching characteristic with a short total length. SOLUTION: In this hydraulic power unit-mounted truck crane provided with an upper revolving superstructure 4 provided with a driver's cab 3 and a telescopic derricking boom 5, on a central part of a lower traveling body 2 provided with outriggers on its from and rear parts, and further having hydraulic power units 11, 11A on the lower traveling body 2, the hydraulic power units 11, 11A are positioned approximately just above the rear outrigger 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a crane vehicle equipped with a hydraulic power unit.

[0002]

2. Description of the Related Art Conventionally, working vehicles such as hydraulic excavators and mobile crane trucks for performing road works and construction works in urban areas have been provided with a hydraulic pump driven by an engine as a power source. The work machine is operated by driving a hydraulic actuator with oil, but it is desired to reduce noise during work in order to improve the environment for the surrounding residents. Further, in recent years, regulations on exhaust gas have been strengthened due to problems concerning the global environment. In addition, there is an indoor work site such as a factory as a work site, and work sites that dislike exhaust gas and noise are increasing.

As a prior art for solving these problems, there is known a crane vehicle equipped with a hydraulic power unit system disclosed in Japanese Patent Publication No. 3-67164 as shown in FIG.

[0004] A hydraulic power unit 101 having a plurality of hydraulic pumps (not shown) and an electric motor for driving the hydraulic pumps is provided by a wheel crane 100.
It is provided in. The electric motor rotates by being supplied with power from a nearby power supply. The pressure oil discharged from the hydraulic pump is supplied to the vehicle via a hydraulic hose connected to a quick coupling (not shown). As a result, it is possible to work while the engine is stopped, no exhaust gas is generated, and the noise can be suppressed to a low level generated from the electric motor or the hydraulic device.

A mounting base 102 for mounting the hydraulic power unit 101 is provided at the rear of the wheel crane 100. The work can be performed while the hydraulic power unit 101 is mounted on the wheel crane 100, or the hydraulic power unit 101 can be operated. It is also possible to run while traveling with the. The wheel crane vehicle 100 has a telescopically undulating boom 103,
The boom 103 is provided with a spiral screw 104 at the tip thereof to perform pile driving.

[0006] As another example, there is known a crane vehicle equipped with a hydraulic power unit system disclosed in Japanese Utility Model Laid-Open No. 58-75285, as shown in FIG. The mobile crane truck equipped with the hydraulic power unit system includes a vehicle cab 202 of a truck crane vehicle 200 and a front outrigger 2.
A hydraulic power unit 201 having a hydraulic pump (not shown) and an electric motor for driving the hydraulic pump is mounted on the upper surface of the vehicle body frame 204 at a position between the hydraulic power unit and the hydraulic pump. The truck crane truck 200 is provided with a boom 205 which can be extended and retracted so that crane work can be performed.

[0007]

However, as shown in FIG. 6, a crane truck equipped with a hydraulic power unit system disclosed in Japanese Patent Publication No. 3-67164 usually has a length of 1 ton.
A heavy hydraulic power unit 101 having a certain weight is arranged behind the rear outrigger 105. Therefore, when the crane operation is performed by removing the spiral screw 104, the stability is good and the lifting capacity is large in the forward suspension work in the work area in front of the front outrigger 106, but the lifting ability is larger behind the rear outrigger 105. On the other hand, in the rear lifting work in the work area, the stability is deteriorated, and the lifting ability is also reduced. The wheel crane 100 has a shorter overall length than a truck crane, and has the advantage of being easily inserted into a narrow place when traveling and moving. However, the hydraulic power unit 101 is mounted behind the wheel crane 100. Wheel crane truck 1
00 is too long and the hydraulic power unit 1
If the vehicle travels with the 01 mounted, it will not be possible to enter a narrow place.

Further, in a crane vehicle equipped with a hydraulic power unit system disclosed in Japanese Utility Model Laid-Open Publication No. 58-75285, the hydraulic power unit 201 is disposed forward of the front outrigger 203 as shown in FIG. for that reason,
There is no hindrance in terms of stability and lifting capacity in the rear suspension work in the work area behind the rear outrigger 206, but the stability in the front suspension work in the work area in front of the front outrigger 203 deteriorates. Would.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a crane vehicle equipped with a hydraulic power unit system having good stability and lifting ability, a short overall length and a good narrow approach. The purpose is.

[0010]

In order to achieve the above object, a first aspect of the present invention is to provide a boom capable of extending and retracting a driver's cab at the center of a lower traveling body having outriggers in front and rear. And a hydraulic power unit-equipped crane vehicle having a hydraulic power unit mounted on a lower traveling body, the hydraulic power unit being arranged almost directly above the rear outrigger.

According to the first aspect of the present invention, the hydraulic power unit is disposed almost directly above the rear outrigger. Therefore, even in the case of a rear suspension work in a work area behind the rear outrigger, the hydraulic power unit is disposed forward of the rear outrigger. The moment due to the weight of a certain crane truck is hardly reduced, the stability is good, and the lifting capacity can be kept good.

When moving in a traveling posture, the hydraulic power unit is located forward of the rear end of the crane vehicle, so that the entire length of the crane vehicle is short and the crane vehicle can easily enter a narrow site.

According to a second aspect based on the first aspect, the hydraulic power unit has a gate-shaped configuration sandwiching the engine room of the lower traveling body.

According to the second aspect, in addition to the functions and effects of the first aspect, the hydraulic power unit has a gate-like shape sandwiching the engine room. Since the height of the upper surface of the power unit can be reduced, and the overall height of the crane truck can be reduced, the vehicle can run under obstacles having a low height, and the approachability to narrow places is improved.

According to a third aspect based on the first aspect, the hydraulic power unit is composed of two units and is disposed on the left and right sides of the engine room of the lower traveling body.

According to the third aspect of the invention, in addition to the functions and effects of the first aspect of the invention, the hydraulic power unit is composed of two units and is disposed on the left and right sides of the engine room of the lower traveling body. Since the height can be made lower than that of the engine room, the height of the rear portion of the crane truck is low, and the rear view from the driver's seat during traveling is good. Further, since the hydraulic power unit can be arranged at a low position of the crane truck, inspection and operation can be easily performed from the ground.

According to a fourth aspect of the present invention, an upper revolving unit having a driver's cab and a retractable boom is provided at the center of a lower traveling unit having outriggers in front and rear, and a hydraulic power unit is provided on the lower traveling unit. In a crane vehicle equipped with a hydraulic power unit, the hydraulic power unit is arranged between the rear outrigger and the front outrigger and in the vicinity of the rear outrigger.

According to the fourth aspect of the present invention, the hydraulic power unit is disposed between the rear outrigger and the front outrigger and in the vicinity of the rear outrigger, so that the hydraulic power unit can be hung rearward in a work area behind the rear outrigger. Since the moment due to the weight of the crane vehicle located forward of the rear outrigger is increased, the stability and the lifting ability are improved as compared with the case where the hydraulic power unit is not mounted.

Further, when moving in the running posture, the hydraulic power unit is located forward of the rear end of the crane vehicle, so that the entire length of the crane vehicle is short and the crane vehicle can easily enter a narrow site.

According to a fifth aspect based on the fourth aspect, the hydraulic power unit has a gate-shaped configuration sandwiching the engine room of the lower traveling body.

According to the fifth aspect, in addition to the functions and effects of the fourth aspect, since the hydraulic power unit has a gate-like shape sandwiching the engine room, the hydraulic power unit is more hydraulically arranged than disposed above the engine room. Since the height of the upper surface of the power unit can be reduced, the vehicle can run under obstacles having a low height, and the approachability to narrow places is improved.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a traveling posture state of a crane vehicle equipped with a hydraulic power unit system. As shown in FIG. 1, a mobile crane 1 which is a wheel crane vehicle has a lower traveling body 2 having a front wheel 2 a and a rear wheel 2 b, and an upper revolving body 4 having a driver's cab 3 is horizontally rotatable around a vertical axis. Is pivoted to. The upper revolving unit 4 has a multi-stage telescopic boom 5 having a base boom 5a.
The upper part of the base end is pivotally attached by a pin 5c so as to be able to move up and down. The cab 3 is on the right side of the crane truck 1. The upper swing body 4 swings by a hydraulic motor (not shown). The boom 5 is raised and lowered by a boom raising and lowering cylinder (not shown).

In the running posture, the boom 5 is stored in a state in which the driver's cab 3 is directed forward and downward across the left side surface, which is the side surface on the center side of the vehicle body of the crane vehicle 1. In this state, the rear end 5b of the telescopic part of the boom 5 is
a protrudes backward from the rear end. A front outrigger 9 is provided at a front portion of the lower traveling body 2, and a rear outrigger 7 is provided at a rear portion. The front outrigger 9 has a front right outrigger 9a and a front left outrigger 9b, and the rear outrigger 7 has a rear right outrigger 7a and a rear left outrigger 7b.

At the left and right sides of the rear part of the lower traveling body 2, mounting brackets 12 are provided, on which a hydraulic power unit 11 is disposed. Hydraulic power unit 11
Is located in front of the rear end 2c of the lower traveling body 2, that is, in front of the rear end of the crane vehicle 1, and almost directly above the rear outrigger 7. The hydraulic power unit 11 is located behind the rear end 5b of the telescopic portion of the boom 5 projecting rearward from the rear end of the base boom 5a, and is spaced apart from the rear end 5b of the telescopic portion of the boom 5. I have.

The hydraulic power unit 11 has a vertically long rectangular shape when viewed from the side of the crane 1 as shown in FIG. 1 and, as shown in FIG. The upper part has a generally rectangular shape with a vertically long rectangular cube on the left and right sides on the lower surface of both ends of a horizontally long rectangular cube. And the hydraulic power unit 11
Are arranged so as to sandwich the engine room 8 between the gate-shaped openings 11a. Hydraulic power unit 1
1 has a gate shape, so that the engine room cover 8a can be pivoted upward and opened between the openings 11a, as shown by the dashed line in FIG. 1, so that the inside of the engine room 8 can be easily inspected. You can do it.

Further, since the hydraulic power unit 11 has a gate shape sandwiching the engine room 8, the hydraulic power unit 11 has a smaller shape than that which is disposed above the engine room 8.
Of the upper surface 11b can be reduced. Therefore,
As shown in FIG. 1, the upper surface 11 of the hydraulic power unit 11
The height of b is almost the same as the entire height of the crane truck 1. Even when the crane truck 1 travels and moves, it can be used in a building with a low ceiling or a low bridge. It can pass under a low-height obstacle, such as below or at the entrance of a building with a low entrance height. Is kept good.

The hydraulic power unit 11 has three units: a hydraulic power source unit 13, a control unit 14, and a power supply unit 15. The hydraulic power source unit 13, the control unit 14, and the power supply unit 15 are soundproof,
Box structure for waterproof and dustproof. The hydraulic power source unit 13 has a plurality of hydraulic pumps 16 and an electric motor 17 for driving the hydraulic pumps 16. Hydraulic power source unit 13
Is connected to hydraulic piping of the crane truck 1 by piping not shown.

The control unit 14 has a control device 18 for controlling the rotation of the motor 4, a power switch 19 for turning on and off an external power supply, and a protection breaker 20 in the event of an abnormal power supply. The control device 18 is an inverter 1
8a and a control unit 18b. Power supply unit 15
A plurality of connectors 21 for connecting a power cable (not shown) to the hydraulic power unit 11 to be supplied with power from an external temporary power supply (for example, a power pole, a generator, equipment, etc.); A plurality of fuses 22 for protecting an electric circuit (not shown);
8 has a plurality of relays 23 for switching.

Since the hydraulic power source unit 13 does not need to be inspected or operated daily, the hydraulic power unit 1 having a gate shape is used.
1 and is arranged at a high position of the crane truck 1. Since it is necessary to operate the power switch 19, the control unit 14 is provided at the lower right of the portal-shaped hydraulic power unit 11. Therefore, since the control unit 14 is located on the right side of the cab 3 where the cab 3 is located, the control unit 14 is located at a position close to the cab 3 and an operator who gets off the cab 3 can immediately operate the hydraulic power unit 11. .

Since the power supply unit 15 is provided at the lower left of the portal-shaped hydraulic power unit 11, the crane truck 1
The power cable is connected to the plurality of connectors 21 and the inspection of the plurality of fuses 22 and the plurality of relays 23 for switching the control device 18 can be easily performed from the ground. Similarly, the control unit 14
Since it is provided at the lower right part of the gate-shaped hydraulic power unit 11, it is arranged at a low position of the crane truck 1, and the control device 18 and the protection breaker 20 are easily inspected, and the power switch 19 is easily operated from the ground. be able to.

When the mobile crane truck equipped with the hydraulic power unit system according to the first embodiment moves in the running posture as shown in FIG.
Since the crane truck 1 is located ahead of the rear end of the crane truck 1, the overall length of the crane truck 1 is short and can easily enter a narrow site.

When the operator arrives at the work site, the operator connects a power cable (not shown) to the hydraulic power unit 11 with a plurality of connectors in order to supply the power from an external temporary power source (for example, a power pole, a generator, equipment, etc.). 21. Since the power supply unit 15 is provided at the lower left part of the portal-shaped hydraulic power unit 11, these connections can be easily made from the ground at a low position of the crane truck 1. Then, the power switch 1 of the control unit 14
Operate 9 Since the control unit 14 is provided at the lower right of the portal-shaped hydraulic power unit 11, the control unit 14 is disposed at a lower position of the crane truck 1, and the power switch 19 can be easily operated from the ground.

Then, returning to the operator's cab 3, the front outriggers 9 and the rear outriggers 7 are protruded and grounded, so that a lifting operation as a crane operation can be performed. Since the control unit 14 having the power switch 19 is on the right side of the cab 3 where the cab 3 is located, the control unit 14 is located at a position close to the cab 3.
It is possible to get into the cab 3 immediately.

Accordingly, the crane truck 1 operates the hydraulic power unit 11 by the electric power from the external power supply without moving the engine to generate hydraulic pressure, thereby causing the boom 5 to expand and contract, the upper swing body 4 to swing, and Work can be done quietly. As a result, the crane truck 1 can be operated with the engine stopped, no exhaust gas is generated, and the noise can be suppressed to a low level generated by the electric motor or the hydraulic device.

Since the hydraulic power unit 11 is disposed almost directly above the rear outrigger 7, even in the case of the rear suspension work in the work area behind the rear outrigger 7, the hydraulic power unit 11 is located forward of the rear outrigger 7. The moment due to the weight of the crane truck 1 is hardly reduced, the stability is good, and the lifting capacity can be kept good.

Next, a second embodiment according to the present invention will be described with reference to FIG. FIG. 3 is a diagram illustrating a traveling posture state of the crane vehicle equipped with the hydraulic power unit system. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 3, in a crane truck 1A which is a wheel crane truck, in a running posture, the boom 5A is moved forward and downward across the left side surface of the cab 3 on the center side of the body of the crane truck 1A. It is stored in a headed state, but in that state, unlike the first embodiment, the boom 5
The rear end of the telescopic portion of A does not project rearward from the rear end of the base boom 5Aa. Therefore, the hydraulic power unit 1
1 is an upper revolving superstructure 4 in front of the rear outrigger 7.
Is directly attached to the lower traveling body 2 by a bolt (not shown). That is, the hydraulic power unit 11 is disposed between the rear outrigger 7 and the front outrigger 9 and near the rear outrigger 7.

As described in the first embodiment, the hydraulic power unit 11 has a gate shape sandwiching the engine room 8A. The engine room cover 8Aa is provided with an inspection cover 8Ab, and the inspection cover 8Ab can be opened. Therefore, the inside of the engine room 8A can be easily inspected.

Accordingly, since the hydraulic power unit 11 has a gate-like shape sandwiching the engine room 8A, the height of the upper surface 11b of the hydraulic power unit 11 can be made lower than when it is disposed above the engine room 8A.

Also, as in the first embodiment, when the vehicle moves in the running posture as shown in FIG. 3, the hydraulic power unit 11 is located forward of the rear end of the crane vehicle 1A. Its short overall length allows it to easily enter narrow sites.

Since the hydraulic power unit 11 is disposed at a position forward of the rear outrigger 7 and behind the upper revolving structure 4, even in the case of a rear suspension work in a work area behind the rear outrigger 7, Since the moment due to the weight of the crane vehicle 1 located forward of the rear outrigger 7 is increased, the stability and the lifting ability are better than when the hydraulic power unit 11 is not mounted.

Since the hydraulic power unit 11 has a gate-like shape as in the first embodiment and has three units, the functions and effects produced by the unit are the same as those in the first embodiment. Is omitted.

Next, a third embodiment according to the present invention will be described with reference to FIG. FIG. 4 is a diagram showing a traveling posture state of the crane vehicle equipped with the hydraulic power unit system. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, the crane truck 1B, which is a wheel crane truck, has a running posture in which the boom 5 is the side surface of the cab 3 on the center side of the vehicle body of the crane truck 1B, as in the first embodiment. The boom 5 is stored in a state where it is directed forward and downward across the side surface, and in this state, the rear end 5b of the telescopic portion of the boom 5 projects rearward from the rear end of the base boom 5a.

The hydraulic power unit 11A is composed of two units having a horizontally long cubic shape.
4A and a power control unit 15A. The hydraulic power unit 11A is, as shown in FIG.
B has a rectangular shape in side view, and the hydraulic power unit 1
1A arranges these two units on the left and right sides of the engine room 8, and is located forward of the rear end 2c of the lower traveling unit 2;
That is, the central part in the longitudinal direction of the hydraulic power unit 11A is located forward of the rear end of the crane truck 1
In the fore-and-aft direction, the rear outrigger 7 is located at a position substantially above the rear outrigger 7, and is directly attached to the lower traveling body 2 by a bolt (not shown). Therefore, FIG.
As shown by the dashed line in FIG. 2, the engine room cover 8a can be pivoted upward and opened, so that the engine room 8 can be easily inspected.

Further, since the hydraulic power unit 11A is disposed with its longitudinal direction being horizontal, the upper surface 11Ab of the hydraulic power unit 11A can be lower than the engine room 8 and the rear of the crane truck 1B Height decreases. Therefore, the rear view from the driver's seat 3 during traveling of the crane truck 1 is good.

The hydraulic power supply unit 14A and the power supply control unit 15A have a box structure for soundproofing, waterproofing, and dustproofing, respectively. The hydraulic power source unit 14A includes a plurality of hydraulic pumps 16 and an electric motor 1 for driving the hydraulic pumps 16.
7 are provided. The hydraulic power source unit 14A is connected to hydraulic piping of the crane truck 1 by piping (not shown).
The power supply control unit 15A has a control device 18 for controlling the rotation of the electric motor 4, a power switch 19 for turning on and off an external power supply, and a protection breaker 20 for an abnormal power supply. The control device 18 includes an inverter 18a and a control unit 18b, a plurality of connectors 21 for connecting a power cable (not shown) for receiving power from an external temporary power supply, and protection of an electric circuit (not shown) of the hydraulic power unit 11A. And a plurality of relays 23 for switching the control device 18.

The power control unit 15A is provided on the right side of the engine room 8 because it is necessary to operate the power switch 19. Therefore, since the power supply control unit 15A is located on the right side of the cab 3 where the cab 3 is located, the power supply control unit 15A is located near the cab 3 and the operator who gets off the cab 3 can immediately operate the hydraulic power unit 11A. it can.
Further, the power supply control unit 15A is disposed on the right side of the engine room 8 at a low position of the crane truck 1, so that a power supply cable can be connected to the plurality of connectors 21 and the plurality of fuses 22 and the control device 18 can be switched. Multiple relays 2
3, the inspection of the control device 18, the protection breaker 20, and the operation of the power switch 19 can be easily performed from the ground.

Also, as in the first embodiment, when moving in the running posture as shown in FIG. 4, since the hydraulic power unit 11A is located forward of the rear end 2c of the crane truck 1B, the crane truck 1B Has a short overall length, making it easy to enter narrow sites.

Since the hydraulic power unit 11A has its central portion in the longitudinal direction disposed almost directly above the rear outrigger 7, the hydraulic power unit 11A can be hung rearward in a work area behind the rear outrigger 7. Moment due to the weight of the crane truck 1B located forward of the rear outrigger 7 is hardly reduced, the stability is good, and the lifting capacity can be kept good.

In the first, second, and third embodiments, as shown in FIGS. 1, 2, and 3, the weight of the front wheel 2a and the rear wheel 2b during traveling is provided on the front portion of the lower traveling body 2. May be provided with a counterweight 2d for adjusting the balance. The counterweight 2d is attached to the front upper surface of the lower traveling body 2 by a bolt (not shown). As a result, the stability of the crane vehicles 1, 1A, 1B during traveling is further improved, and the driving operability is improved.

In the above description, the operator's cab 3 has been described as being on the right side of the crane trucks 1, 1A, 1B. However, even if the operator's cab 3 is on the left side, the operation and effects of the present invention are not changed. Needless to say, there is no.

[Brief description of the drawings]

FIG. 1 is a diagram showing a traveling posture state of a crane vehicle equipped with a hydraulic power unit system according to a first embodiment.

FIG. 2 is a rear view of the crane vehicle equipped with the hydraulic power unit system according to the first embodiment.

FIG. 3 is a diagram illustrating a traveling posture state of a crane vehicle equipped with a hydraulic power unit system according to a second embodiment.

FIG. 4 is a diagram illustrating a traveling posture state of a crane vehicle equipped with a hydraulic power unit system according to a third embodiment.

FIG. 5 is a rear view of a crane vehicle equipped with a hydraulic power unit system according to a third embodiment.

FIG. 6 is a diagram showing a conventional crane vehicle equipped with a hydraulic power unit system.

FIG. 7 is a diagram showing another conventional crane vehicle equipped with a hydraulic power unit system.

[Explanation of symbols]

2: lower traveling body, 3: operator's cab, 4: upper revolving superstructure, 5, 5
A: boom, 7: rear outrigger, 8, 8A: engine room, 9: front outrigger, 11, 11A: hydraulic power unit.

Claims (5)

[Claims] An undercarriage with outriggers at the front and rear
In the center of (2), the operator's cab (3) and the telescopic boom
(5), a hydraulic power unit (11, 11A) is provided in the lower traveling structure (2), and the hydraulic power unit (11, 11A) is provided in the rear traveling body. A crane equipped with a hydraulic power unit, which is disposed almost directly above the side outrigger (7). 2. The mobile crane truck according to claim 1, wherein the hydraulic power unit (11) has a portal shape sandwiching an engine room (8) of the lower traveling body (2). Crane truck. 3. The mobile crane equipped with a hydraulic power unit according to claim 1, wherein the hydraulic power unit (11A) is composed of two units, and is disposed on the left and right sides of the engine room (8) of the lower traveling body (2). Crane truck with hydraulic power unit. 4. An undercarriage with outriggers at the front and rear
At the center of (2), the cab (3) and the telescopic boom (5
(A) with a revolving superstructure (4) and a hydraulic power unit
In the crane truck equipped with the hydraulic power unit (11) on the lower traveling body (2), the hydraulic power unit (11) is connected between the rear outrigger (7) and the front outrigger (9) and the rear outrigger (7). A crane vehicle equipped with a hydraulic power unit, which is arranged in the vicinity. 5. The crane truck according to claim 4, wherein the hydraulic power unit (11) has a gate-like shape sandwiching the engine room (8A) of the lower traveling body (2). Crane truck.