JP2001220771A - Construction vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction vehicle capable of being made as compact as possible in appearance and mounting an electric motor in place of an internal combustion engine as a main drive source on the frame of the vehicle which normally uses an internal combustion engine as the main drive source. SOLUTION: The construction vehicle 1 has a cooling fan 12 provided at one end 11Aa of the output shaft 11A of the electric motor 11, with the other end 11Ab of the output shaft 11A connected to the driveshaft 13A of a hydraulic pump 13. An oil cooler 15 for hydraulic fluid and a radiator 16 for an air conditioner are provided in the frontal area of the cooling fan 12, and the oil cooler 15, the radiator 16, the cooling fan 12 and the hydraulic pump 13 are all disposed on the central axis of the output shaft 11A of the electric motor 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction vehicle in which an electric motor as a main drive source is mounted on a frame of a construction vehicle having an internal combustion engine as a main drive source, instead of the internal combustion engine.

[0002]

2. Description of the Related Art Various construction vehicles such as power shovels include:
There is a type in which a hydraulic pump is driven by an engine (internal combustion engine), and a traveling device or a working device is driven by hydraulic oil supplied from the hydraulic pump.

A construction vehicle (power shovel) A shown in FIG. 3A includes a traveling device H and an upper revolving unit I. The upper revolving unit I includes a cabin J, a working device K, and a driving unit D.
The drive unit D is covered with an engine cover (exterior plate) Ic.

As shown in FIG. 3 (b), the drive section D has an engine E as a main drive source mounted on a frame If of the upper swing body I, and has one end of an output shaft Ea of the engine E. A cooling fan F is connected, and a hydraulic pump P is connected to the other end of the output shaft Ea.

The drive section D includes an alternator (AC generator) G driven by the engine E and a compressor C for an air conditioner. Further, in the front area of the cooling fan F, an engine cover Ic is provided. A radiator Re for an engine, an oil cooler Oc for hydraulic oil, and a radiator Ra for an air conditioner are installed.

On the other hand, in order to solve the problem of emission of harmful gas, noise, and the like in a construction vehicle using an engine as a main drive source as described above, a construction vehicle in which the main drive source is replaced with an electric motor is used. Provided.

As shown in FIG. 4, a drive unit D of a construction vehicle in which an engine E (FIG. 3) is replaced with an electric motor M has an upper revolving unit I.
An electric motor M is mounted on a frame If (FIG. 3), a cooling fan F is connected to one end of an output shaft Ma of the electric motor M, and a hydraulic pump P is connected to the other end of the output shaft Ma. I have.

The drive section D includes a radiator Ra for an air conditioner and an oil cooler Oc for hydraulic oil, a dedicated cooling fan f, and a small motor m for driving the cooling fan f. And a dedicated small motor m for driving the compressor C, and a dedicated converter Q for charging a battery in order to obtain electric power for the vehicle.

[0009]

The engine E of the construction vehicle A shown in FIG. 3 has a crankcase Ec containing an output shaft Ea as shown in FIG. 3B, and a lower portion of the case Ec. Is provided with an oil pan Eo, and an upper portion is provided with a cylinder block Es and a cylinder head Eh.

Further, the driving unit D of the construction vehicle A shown in FIG.
In order to efficiently cool the engine E, the cylinder block Es and the cylinder head Eh
And a belt transmission mechanism V provided between the cooling fan F and the output shaft Ea of the engine E.
It is configured to be driven via a.

[0011] Therefore, as described above, the engine radiator Re installed in the front area of the cooling fan F and the like,
The relative position of the engine E with respect to the output shaft Ea is largely different from each other in the vertical direction, which causes a problem that the driving unit D is enlarged in the vertical direction.

On the other hand, as shown in FIG. 4, the drive unit D of the construction vehicle in which the main drive source is replaced with an electric motor has an output shaft Ma of the electric motor M which passes through substantially the center of the body Mb. The cooling fan F installed in Ma
It will be arranged at the same height position as.

On the other hand, in the drive section D shown in FIG. 4, a radiator Ra for an air conditioner, an oil cooler Oc for hydraulic oil,
A cooling fan f and a small motor m are installed, for example, above a bonnet (not shown), and the air conditioner compressor C and the small motor m are connected to the upper revolving unit I via a bracket (not shown). It is installed on the frame If.

This is because, as clearly shown in FIG. 5, the output shaft Ma of the electric motor M and the drive shaft Pa of the hydraulic pump P are connected by a large coupling U capable of allowing mutual misalignment. The size from the hydraulic pump P to the cooling fan F becomes longer, and as shown in FIG. 4, a mechanism for cooling the radiator Ra for the air conditioner and the oil cooler Oc for the working oil by the dedicated cooling fan f is large. , The space between the cooling fan F and the engine cover Ic
It becomes difficult to install various accessories such as an oil cooler Oc for hydraulic oil, and the various accessories are unavoidably installed in an appropriate space other than the front area of the cooling fan F.

As described above, in a conventional construction vehicle in which the main drive source is replaced with an electric motor from an engine, due to the layout of various auxiliary devices such as an oil cooler for hydraulic oil, the size of the drive unit is increased, and the There was a disadvantage that the whole vehicle was enlarged.

The present invention has been made in view of the above circumstances, and has as its object to reduce the size of a construction vehicle having a main drive source replaced by an electric motor instead of an engine.

[0017]

In order to achieve the above object, in a construction vehicle according to the present invention, a cooling fan is provided at one end of an output shaft of a motor, and a hydraulic fan is provided at the other end of the output shaft. In addition to connecting to the drive shaft of the pump, an oil cooler for hydraulic oil and a radiator for air conditioner are provided in the front area of the cooling fan, and an oil cooler for hydraulic oil and a radiator for air conditioner And a cooling fan and a hydraulic pump.

According to the above configuration, since the main drive source is replaced with the electric motor from the engine, the size increase due to the difference in the vertical position between the output shaft of the engine and the various accessories is prevented beforehand. .

Further, in the above configuration, since the oil cooler for hydraulic oil and the radiator for air conditioner are provided in the front area of the cooling fan, the oil fan for hydraulic oil and the radiator for air conditioner are electrically connected by the cooling fan. Together with the cooling.

In other words, since the cooling fan is used for cooling the electric motor and for cooling the oil cooler for working oil and the radiator for air conditioner, the cooling fan is used exclusively for cooling the oil cooler for working oil and the radiator for air conditioner. Since a cooling fan and a small motor are not required, the oil cooler for hydraulic oil and the radiator for an air conditioner can be installed in the space between the cooling fan and the engine cover, thereby making the construction vehicle as compact as possible. Can be achieved.

The construction vehicle according to the second aspect of the present invention is the construction vehicle according to the first aspect of the invention, in which a compressor for an air conditioner and an alternator are installed on a body of an electric motor via a mounting member. The compressor for the harmony device and the alternator are configured to be driven by an electric motor.

According to the above configuration, the layout of the compressor for the air conditioner and the alternator is similar to that of a construction vehicle having an engine as a main drive source. Changes in piping, wiring, and the like for the compressor for the harmony device and the alternator are minor, and replacement of the engine with the electric motor can be easily performed.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. A construction vehicle (power shovel) 1 according to the present invention shown in FIG. 1 is configured by replacing a main drive source from an engine to an electric motor with respect to a construction vehicle A having an engine as a main drive source shown in FIG. It is.

As is apparent from FIG. 1, a construction vehicle 1 according to the present invention includes a traveling device 2 and an upper swing body 3,
The upper revolving unit 3 is provided with a cabin 4 and a working device 5, and the upper revolving unit 3 is provided with a drive unit 10. The drive unit 10 is covered with an engine cover (exterior plate) 6.

As shown in FIG. 2, the drive section 10 has a motor 11 as a main drive source.
Is mounted on the frame 3F of the upper swing body 3 on which the engine E is mounted in the construction vehicle A of FIG.

The output shaft 11A of the motor 11 is
It projects from the front and rear of the body 11B (left and right sides in the figure), and one end 11Aa and the other end 11Ab of the output shaft 11A are respectively provided with a cooling fan 12 described later.
And the hydraulic pump 13 are connected.

The electric motor 11 has a body 11B
A plurality of air-cooling fins 11f are provided on the outer peripheral surface, and a leg mounting flange 11F is provided on the bottom portion. The air-cooling fin 11f is fixed to the frame 3F of the upper swing body 3 via the leg mounting flange 11F.

A cooling fan 12 attached to one end 11Aa of the output shaft 11A of the electric motor 11 sends cooling air to the body 11B as it rotates.
Guide ducts 12D for efficiently guiding the cooling air to the air-cooling fins 11f are provided in the outer peripheral area of the cooling fan 12.
Is installed.

On the other hand, a hydraulic pump 13 connected to the other end 11Ab of the output shaft 11A of the electric motor 11 is driven by the electric motor 11 to supply hydraulic oil to the traveling device 2 and the working device 5, and the output shaft 11A The other end 11Ab of
And the drive shaft 13A of the hydraulic pump 13 are connected to each other via a simple coupling 14C.

Here, the above-mentioned motor 11 and hydraulic pump 13 are formed such that the joining flange 11C of the motor 11 and the joining flange 13C of the hydraulic pump 13 are mutually joined via the spacer 14S. It is brazed.

For this reason, the compact simple coupling 14C
, The misalignment between the electric motor 11 and the hydraulic pump 13 can be prevented beforehand, and the small-sized simple coupling 14C allows the hydraulic pump 13 The axial dimension up to is as small as possible.

On the other hand, the front area of the cooling fan 12 described above
An oil cooler 15 for hydraulic oil is installed in the left area in FIG. Further, the oil cooler 15 for hydraulic oil is used.
A radiator 16 for an air conditioner is installed in a front area (left area in FIG. 2) of the air conditioner. The radiator 16 for the air conditioner
It is facing o.

That is, the space between the engine cover 6 and the cooling fan 12 has an oil cooler 15 for hydraulic oil.
And a radiator 16 for an air conditioner are installed,
The hydraulic oil cooler 15 and the air conditioner radiator 16 are cooled by the cooling fan 12 with the cooling air flowing from the air inlet 6 o of the engine cover 6.

As described above, the cooling fan 12 and the hydraulic pump 13 are connected to one end 11Aa and the other end 11Ab of the output shaft 11A of the electric motor 11, respectively. By installing the cooler 15 and the radiator 16 for the air conditioner, the center axis o of the output shaft 11A of the electric motor 11 is set.
-O, a radiator 16 for an air conditioner, an oil cooler 15 for hydraulic oil, a cooling fan 12 and a hydraulic pump 13
Will be provided.

On the other hand, the body 11B of the motor 11
An alternator (AC generator) 17 and an air conditioner compressor 18 are each connected to a stay (attachment member) 1.
9 and these alternators 1
7 and the air conditioner compressor 18 are respectively provided with belt transmission mechanisms 17V, 1V provided between the output shaft 11A and the output shaft 11A.
Driven via 8V.

According to the construction vehicle 1 having the above-described configuration, the main drive source is replaced with the electric motor 11 from the engine.
Upsizing due to a difference in the vertical position between the output shaft of the engine and the various accessories is prevented beforehand.

Further, an oil cooler 15 for hydraulic oil and a radiator 16 for an air conditioner are provided in the front area of the cooling fan 12, and the cooling fan 12 is used to cool the motor 11 and to cool the oil cooler 15 for hydraulic oil and an air conditioner. Since the cooling fan and the small-sized motor for cooling the oil cooler 15 for the working oil and the radiator 16 for the air conditioner are not required by sharing the cooling for the radiator 16, the electric motor 11 and the hydraulic pump are used as described above. 13 is connected with the simple coupling 14C, the size from the cooling fan 12 to the hydraulic pump 13 is reduced, and the oil cooler 15 for the working oil and the radiator 16 for the air conditioner are connected to the cooling fan 11 and the engine. It can be installed in the space between the cover 6 and the construction vehicle 1 as much as possible. It can be achieved ECTS of.

Further, according to the above configuration, the oil cooler 15 for hydraulic oil and the radiator 16 for the air conditioner are installed in the space between the engine cover 6 and the cooling fan 11, so that the oil cooler for hydraulic oil is provided. Such an auxiliary machine is not installed on the hood unlike the conventional configuration shown in FIG. 4, so that the various auxiliary machines are not exposed to wind and rain, and the appearance of the construction vehicle 1 is not spoiled.

Further, according to the above configuration, the alternator 1
7 and the air conditioner compressor 18
The layout of the alternator 17 and the air conditioner compressor 18 is similar to that of a construction vehicle whose main drive source is an engine, by installing the alternator 17 and the compressor 18 for an air conditioner via the motor 9 through the body 11B.

Therefore, when the main drive source is replaced from the engine to the electric motor 11, the alteration of the piping and wiring between the alternator 17 and the compressor 18 for the air conditioner is only minor, and thus the conversion from the engine to the electric motor 11 is required. Can be easily implemented.

Further, the alternator 17 and the compressor 18 for the air conditioner are installed on the body 11B of the electric motor 11 via the stay 19, in other words, the alternator 17 and the like are mounted on the outer periphery of the body 11B of the electric motor 11. Therefore, the cooling of the electric motor 11 is not carelessly prevented.

In the above-described configuration, the compressor 18 for the air conditioner is driven by the electric motor 11, so that a dedicated small motor (reference numeral m in FIG. 4) in the conventional configuration is not required, and In the conventional configuration, a bracket for installing the air conditioner compressor and the small motor is not required, so that the configuration of the construction vehicle is simplified.

Further, according to the above-described configuration, since the alternator 17 is provided, a dedicated converter (symbol Q in FIG. 4) in the conventional configuration is not required, thereby simplifying the configuration of the construction vehicle. It will be.

In the above-described embodiment, an example in which the present invention is applied to a power shovel is shown. However, the present invention is effectively applied to various types of construction vehicles other than the power shovel, such as a tractor shovel and a bulldozer. It goes without saying that you get it.

[Brief description of the drawings]

FIG. 1 is a conceptual overall side view showing a construction vehicle according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a layout of an electric motor and the like in the construction vehicle shown in FIG.

3A is a conceptual overall side view showing a conventional construction vehicle, and FIG. 3B is a conceptual diagram showing a layout of an engine and the like in the conventional construction vehicle.

FIG. 4 is a conceptual diagram showing a layout of a motor and the like in a conventional construction vehicle in which a main drive source is replaced with a motor.

FIG. 5 is a sectional side view of a main part showing a layout of a motor and the like in the conventional construction vehicle shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Construction vehicle, 3F ... Frame, 11 ... Electric motor, 11A ... Output shaft, 11Aa ... One end, 11Ab ... The other end, 12 ... Cooling fan, 13 ... Hydraulic pump, 13A ... Drive shaft, 15 ... Oil cooler for hydraulic oil , 16 ... radiator for air conditioner, 17 ... alternator, 18 ... compressor for air conditioner, 19 ... stay (mounting member).

Claims (2)

[Claims] 1. A construction vehicle in which an electric motor as a main drive source is mounted on a frame of a construction vehicle having an internal combustion engine as a main drive source instead of the internal combustion engine, wherein one end of an output shaft of the motor is provided. A cooling fan, and the other end of the output shaft is connected to a drive shaft of a hydraulic pump, and an oil cooler for hydraulic oil and a radiator for an air conditioner are provided in a front area of the cooling fan. A construction vehicle comprising: a hydraulic oil cooler, a radiator for an air conditioner, a cooling fan, and a hydraulic pump arranged on a central axis of the hydraulic oil pump. 2. An air conditioner compressor and an alternator are installed on a body of the electric motor via a mounting member, and the air conditioner compressor and the alternator are driven by the electric motor. The construction vehicle according to claim 1.