JP3713480B2 - Electric drive wheeled work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wheel work vehicle such as a wheel loader, and more particularly to an electrically driven wheel work vehicle equipped with an engine, a generator, an electric motor, an inverter / converter, and a battery.
[0002]
[Prior art]
The wheel loader includes a vehicle body front portion and a vehicle body rear portion, and the vehicle body front portion and the vehicle body rear portion are connected to each other so as to be relatively rotatable. The front part of the vehicle body is provided with front wheels and a front working device for excavating and loading earth and sand. The rear part of the vehicle body has rear wheels, and a cab is installed above the front part of the vehicle body frame at the rear part of the vehicle body, and an engine is arranged at the rear part of the vehicle body frame at the rear part of the vehicle body.
[0003]
Generally, a hydraulic drive is adopted as a drive system for such a wheel work vehicle such as a wheel loader. However, in recent years, an electric drive system that travels with an electric motor as described in, for example, JP-A-11-158937 has been studied. This electric drive device drives a generator by an engine, drives an electric motor by electric power generated by the generator, and drives a rear wheel by this electric motor to run.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-158937
[0005]
[Problems to be solved by the invention]
However, the above prior art has the following problems.
[0006]
In an electrically driven wheel type work vehicle as described in JP-A-11-158937, a battery is preferably provided. When the battery is provided, not only the power generated by the generator is stored, but also the energy saving effect is enhanced by energy regeneration during traveling deceleration. However, if a battery is provided, an inverter / converter is required to convert the alternating current generated by the generator into direct current and supply it to the battery, or to convert the direct current of the battery into alternating current and supply it to the electric motor. . In this case, the generator, inverter / converter, battery, and electric motor must be connected by a cable in order to exchange power. The power handled by the generator, inverter / converter, battery, and electric motor is a high voltage high current with a maximum voltage of 260 to 360 V and a maximum current of 100 A, and the thickness of the cable is 1 cm or more in diameter. For this reason, when the cable becomes long, not only the price becomes high, but also noise is likely to get on the surrounding electric devices and signal lines, and the reliability of the operation is lowered.
[0007]
Moreover, when a generator, an inverter / converter, a battery, and an electric motor are arranged near the engine, their temperatures are likely to rise. In particular, since a battery is easily affected by temperature, in order to exert its performance, the temperature management of the battery is very strict, and it is necessary to constantly monitor the temperature by a battery controller attached to the battery. However, the space inside the vehicle body (inside the rear frame) of the wheel type work vehicle is narrow, and electric devices such as a generator and an electric motor are also heating elements. Therefore, when the battery is disposed inside the vehicle body, the battery is positioned near a heating element such as an engine, a generator, and an electric motor, and the performance cannot be sufficiently exhibited. Further, if an inverter / converter and a battery are arranged in a narrow space inside the vehicle body in addition to a generator and an electric motor, maintenance of the inverter / converter and the battery becomes extremely difficult.
[0008]
On the other hand, electric motors and electric motors have a large performance drop due to temperature rise compared to hydraulic equipment and torque converters used in the hydraulic drive system. Therefore, when an electric motor or an electric motor is disposed inside the vehicle body, it is necessary to increase the cooling performance as compared with a hydraulic drive system using a hydraulic device or a torque converter.
[0009]
A first object of the present invention is to provide an electric drive wheel that can shorten the connecting cables by appropriately arranging a generator, an inverter, a battery, and an electric motor, and can improve operation reliability. It is to provide a type work vehicle.
[0010]
The second object of the present invention is to arrange the battery and the inverter / converter in a place where there is little influence due to the temperature change inside the vehicle body and has a sufficient space, so that the battery performance can be sufficiently exhibited and the battery And an electrically driven wheel-type work vehicle that facilitates maintenance of the inverter / converter.
[0011]
The third object of the present invention is to provide an electrically driven wheel-type work vehicle capable of appropriately cooling the generator and the electric motor by guiding the air that has cooled the battery to the arrangement space of the generator and the electric motor. That is.
[0012]
[Means for Solving the Problems]
(1) In order to achieve the first object, the present invention provides an electrically driven wheel-type work vehicle in which an engine is mounted on a rear portion of a vehicle body frame and a driver's cab is mounted on an upper front portion of the vehicle body frame. It is assumed that a generator and an electric motor are arranged in the front space of the vehicle body frame below the cab, and a battery and an inverter / converter are arranged in the vicinity of the front portion of the vehicle body frame.
[0013]
In this way, the generator and the electric motor are arranged in the front space of the vehicle body frame below the cab, and the battery and the inverter / converter are arranged in the vicinity of the front portion of the vehicle body frame. Since the battery and the inverter / converter are positioned, the connection cable between the generator, the electric motor, the inverter / converter, and the battery can be shortened, and the operation reliability can be improved.
[0014]
(2) In order to achieve the second object, the present invention provides the battery according to (1), wherein the battery is disposed outside a lateral side portion of the vehicle body frame, and the inverter / converter is disposed in the cab. It shall be placed under the seat.
[0015]
Thereby, the arrangement position of the battery and the inverter / converter is in the vicinity of the front portion of the vehicle body frame, and the connecting cable between the generator, the electric motor, the inverter / converter, and the battery can be shortened.
[0016]
In addition, the outside of the side part of the body frame and the lower side of the seat in the driver's cab are isolated from the heating elements such as the generator and the electric motor disposed in the front space of the engine and the body frame. / The location of the converter is a place that is less affected by temperature changes inside the vehicle body (inside the vehicle body frame), the battery is unlikely to become hot, the battery performance can be fully demonstrated, and the inverter / converter is also hot. It is prevented. In addition, since the battery and the inverter / converter are arranged in a place where there is a margin in space, their maintenance becomes easy.
[0017]
(3) In the above (2), preferably, the battery is arranged symmetrically on both lateral sides of the body frame.
[0018]
Thereby, even when a heavy battery is mounted, the balance of the vehicle body is maintained, and the stability of the vehicle body can be improved. Moreover, since it arrange | positions at the both sides of the place which has room space, a battery can be enlarged.
[0019]
(4) Moreover, in order to achieve the said 2nd objective, this invention shall arrange | position the said battery and an inverter / converter in the said driver's cabin under the seat in said (1).
[0020]
This also places the battery and the inverter / converter in the vicinity of the front portion of the vehicle body frame, and shortens the connecting cable between the generator, the electric motor, the inverter / converter, and the battery.
[0021]
In addition, the lower side of the seat in the driver's cab is a place isolated from the heating elements such as the generator and the electric motor arranged in the front space of the engine and the body frame. It becomes a place where there is little influence by the temperature change (inside the vehicle body frame), the battery is unlikely to become high temperature, the battery performance can be sufficiently exhibited, and the inverter / converter is also prevented from becoming high temperature. In addition, since the battery and the inverter / converter are arranged in a place where there is a margin in space, their maintenance becomes easy.
[0022]
(5) Further, in order to achieve the third object, in the above (1), the present invention uses the battery as an air-cooling type and discharges air after battery cooling to the front space of the body frame. And
[0023]
As a result, the air after cooling the battery flows into the front space of the vehicle body frame together with the air sucked by the exhaust fan of the engine, and the amount of air flowing into this space increases, and the generator disposed in the space In addition, the electric motor can be appropriately cooled.
[0024]
(6) In the above (5), preferably, the battery cooling air is cooling air from the air conditioner unit.
[0025]
Thereby, the battery can be cooled more effectively.
[0026]
(7) In the above (5), preferably, the air after cooling the battery is discharged to the front space of the body frame by a fan.
[0027]
This also increases the battery cooling effect.
[0028]
(8) In order to achieve the second object, the present invention includes a vehicle body front portion and a vehicle body rear portion that are respectively provided with a front wheel and a rear wheel and are connected to each other so as to be relatively rotatable. In an electrically driven wheel type work vehicle in which an engine is mounted on a rear portion of a box-shaped rear frame that is a vehicle body frame, and a driver's cab is mounted on an upper front portion of the rear frame, the rear frame on the lower side of the cab A generator and an electric motor are disposed in the front space of the vehicle, the battery is disposed symmetrically on both lateral sides of the vehicle rear frame, and an inverter / converter is disposed in the vicinity of the front portion of the rear frame. .
[0029]
As a result, the outside of the lateral side of the body frame and the lower side of the seat in the cab are isolated from the heating elements such as the generator and the electric motor disposed in the front space of the engine and the body frame. / The location of the converter is a place that is less affected by temperature changes inside the vehicle body (inside the vehicle body frame), the battery is unlikely to become hot, the battery performance can be fully demonstrated, and the inverter / converter is also hot. It is prevented. In addition, since the battery and the inverter / converter are arranged in a place where there is a margin in space, their maintenance becomes easy.
[0030]
Furthermore, by arranging the batteries symmetrically on both lateral sides of the vehicle body frame, the balance of the vehicle body can be maintained even when a heavy battery is mounted, and the stability of the vehicle body can be improved. Moreover, since it arrange | positions at the both sides of the place which has a space margin, it can be used as a large capacity of a battery.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0032]
FIG. 1 is a partially transparent side view of a wheel loader that is an electrically driven wheel-type work vehicle according to a first embodiment of the present invention, and FIG. 2 is a top view of the wheel loader vehicle body with its cab removed. .
[0033]
In FIG. 1, reference numeral 100 denotes a wheel loader. The wheel loader 100 includes a vehicle body front portion 101 and a vehicle body rear portion 102, and the vehicle body front portion 101 and the vehicle body rear portion 102 are connected to each other so as to be relatively rotatable in the left-right direction. Yes. The front part 101 of the vehicle body includes a front wheel 103 and a front work device 104 for excavating and loading earth and sand.
[0034]
The rear part 102 of the vehicle body includes a rear wheel 105 and a box-shaped rear frame 106 constituting the vehicle body frame, and four support pillars 107 are provided on the upper front part of the rear frame 106 as shown in FIG. A driver's cab floor 108 is installed through the floor 108, and a driver's cab 110 is arranged on the floor 108. That is, the cab 110 is mounted on the upper front portion of the rear frame 106. A driver's seat 111 having a seat (seat) 111 a is disposed in the driver's cab 110, and the seat 111 a is fixed on the floor 108 by a bracket 16.
[0035]
On the other hand, an engine 121 is arranged in the longitudinal direction at the rear part of the rear frame 106, and the engine 121 includes a discharge fan 122. The fan 122 discharges air flowing in from the front part and the lower part of the rear frame 106 to the rear part of the vehicle body. The equipment (described later), the engine 121 and the radiator 123 disposed in the front part of the rear frame 106 are cooled.
[0036]
The wheel loader 100 is electrically driven, and the generator 11, the electric motor 12, and the transmission 13 are disposed in a front space 124 of the rear frame 106 located below the cab 110, and both side portions of the rear frame 106 are arranged. Battery cases 15a and 15b (represented by “15” below), in which batteries 14a and 14b (represented by “14” hereinafter) are stored, are arranged symmetrically. A partition (not shown) is provided between the engine 121, the generator 11, and the space 124 in which the electric motor 12 and the mission 13 are installed to minimize the influence of the heat of the engine 121 on the generator 11 and the electric motor 12. I have to. The battery 14 is attached with a battery controller (not shown) for monitoring the temperature of the battery 14 and the like.
[0037]
On the other hand, the inverter / converter 17 is disposed on the floor 108 in the bracket 16 below the driver seat 111 a in the cab 110. The output shaft of the electric motor 12 is connected to the mission 13, and the output shaft of the mission 13 is connected to the rear wheel 105. By driving the electric motor 12, the rear wheel 105 is rotationally driven to run.
[0038]
A cooling air inlet 41 (described later) is provided on the front surface of the battery case 15 in the vehicle body traveling direction, and a cooling air outlet 43 (described later) is provided on a side surface of the battery case 15 on the rear frame 106 side. The cooled air cools the battery 14 and flows out from the cooling air outlet 43 to the space 124.
[0039]
FIG. 3 is a diagram showing an electric drive system of the wheel loader 100.
[0040]
In FIG. 3, the generator 11 is driven by driving the engine 121 to generate electric power. The inverter / converter 17 performs control for storing the power generated by the generator 11 in the battery 14 and control for driving the electric motor 12 by the power generated by the power generator 11 or the power of the battery 14. The mission 13 is driven and the rear wheel 105 is driven. Note that. The mission 13 is not essential, and when there is no mission 13, the rear wheel 105 is directly driven by the electric motor 12.
[0041]
The generator 11 and the electric motor 12 and the inverter / converter 17 are connected by cables A and B, respectively, and the inverter / converter 17 and the battery 14 are connected by cable C. A controller 20 is connected to the inverter / converter 17 via a signal line D, and the controller 20 rotates and rotates the electric motor 12 according to the operation amount of the accelerator lever 21 and the operation direction of the forward / reverse switching lever 22. The inverter / converter 17 is controlled to change. For example, the controller 20 is provided with a console box on either the left or right side of the driver's seat 111 and is disposed therein.
[0042]
FIG. 4 is a perspective view of the rear frame 106 of the rear part 102 of the vehicle body.
[0043]
The rear frame 106 has a box-shaped main frame 32 in which left and right side plates 30a, 30b and front and rear end plates 31a, 31b are welded in a rectangular shape. 107 is erected. As described above, the cab floor 108 is installed on the support column 107. Two pairs of support brackets 33a, 33b, 34a, 34b are attached near the bottom inside the rear portion of the main frame 32, and the engine 121 is mounted on these support brackets. In addition, a pair of support brackets 35a and 35b (only one is shown) is attached to the vicinity of the bottom inside the front portion of the main frame 32, and the mission 13 is placed on the support brackets 35a and 35b. The generator 11 is supported by being connected to the output shaft of the engine 121, and the electric motor 12 is supported by having its output shaft connected to the mission 13.
[0044]
L-shaped support brackets 38a, 38b are attached to the upper portions of the front portions of the left and right side plates 30a, 30b of the main frame 32, and the battery cases 15a, 15b are mounted on the support brackets 38a, 38b.
[0045]
According to the present embodiment configured as described above, the following effects can be obtained.
[0046]
1. The generator 11 and the electric motor 12 are arranged below the cab 110 at the front part of the rear frame 106, and the battery 14 is arranged outside the lateral side part of the rear frame 106 in the vicinity of the front part of the rear frame 106. Since the inverter / converter 17 is arranged on the floor 108 below the driver seat 111a in the cab 110 near the front of the frame 106, the battery 14 and the inverter / converter 17 are in the vicinity of the generator 11 and the electric motor 12. Therefore, the connecting cables A, B, C between the generator 11 and the electric motor, the inverter / converter 17 and the battery 14 are shortened, and the generation of noise in the surrounding electrical equipment and the signal line D is reduced. In addition, operation reliability can be improved.
[0047]
2. The outside of the lateral side portion of the rear frame 106 and the lower side of the driver seat 111 in the cab 110 are isolated from the heating elements such as the generator 11 and the electric motor 12 disposed in the front space 124 of the engine 121 and the rear frame 106. Therefore, the arrangement position of the battery 14 and the inverter / converter 17 is a place where there is little influence of the temperature inside the vehicle body (inside the rear frame 106), the battery 14 is not easily heated, and the performance of the battery 14 is fully exhibited. And the inverter / converter 17 is also prevented from reaching a high temperature.
[0048]
3. Since the battery 14 and the inverter / converter 17 are disposed in the vicinity of the generator 11 and the electric motor 12 in a space, there is easy maintenance of the battery 14 and the inverter / converter 17.
[0049]
4). The air that has cooled the battery 14 flows out from the cooling air outlet 43 of the battery case 5 and flows into the front space 124 of the rear frame 106 together with the air sucked from the front and lower portions of the rear frame 106 by the fan 122. The amount of air flowing into 124 increases, and the generator 11 and the electric motor 12 disposed in the space 124 can be appropriately cooled.
[0050]
5. Since the battery 14 is heavy, the vehicle body may become unstable depending on the mounting position of the battery 14, but the battery case 15 is disposed symmetrically on both lateral sides of the rear frame 106, so that the heavy battery 14 Even if it is installed, the balance of the vehicle body is maintained, and the stability of the vehicle body can be improved.
[0051]
6). The outer side of the lateral side portion of the rear frame 106 has a sufficient space, and the battery is disposed on both outer sides of the lateral side portion of the rear frame 106, so that the battery 14 can be increased in capacity.
[0052]
7. Since the inverter / converter 17 is disposed in the vicinity of the driver's seat for operating the machine, the signal line D between the inverter / converter 17 and the controller 20 is provided by arranging the controller 20 of the inverter / converter 17 in the console box at the side of the driver's seat. As a result, the malfunction due to noise of the controller 20 or the like can be reduced, and the operation reliability can be further improved. Further, the distance between the operator and the controller 20 is shortened, and the operability is improved.
[0053]
In the above embodiment, the battery 14 and the battery case 15 are arranged symmetrically on both lateral sides of the front part of the rear frame 106, but both lateral side parts other than the front part of the rear frame 106, for example, It may be arranged symmetrically on both lateral sides near the center of the rear frame 106. Even in this case, the battery 14 is arranged in a place where it is isolated from a heating element such as the engine 121, the generator 11, and the electric motor 12. Thus, the second effect that makes the battery 14 less likely to become high temperature, the third effect that makes maintenance of the battery easy, the fifth effect that improves the balance of the vehicle body by improving the balance of the vehicle body, and the battery 14 are greatly increased. The effect 6 described above that can be achieved in capacity can be obtained. Further, the battery 14 and the battery case 15 may be arranged on one of the outer sides of the front side of the rear frame 106, and the battery 14 is also removed from the heating elements such as the engine 121, the generator 11, and the electric motor 12. It is possible to obtain the above-mentioned effect 2 that makes the battery 14 difficult to reach a high temperature, and the effect 3 described above that facilitates battery maintenance.
[0054]
5 and 6 are views showing the detailed structure of the battery case 15, wherein FIG. 5 is a side view showing a state where the front part of the case is removed, and FIG. 6 is a top view showing a state where the upper part of the case is removed.
[0055]
As described above, the battery case 15 has the cooling air inlet 41 on the front surface 40 in the vehicle body traveling direction, and the cooling air outlet 43 on the side surface 42 on the rear frame 106 side. A filter 45 is disposed at the cooling air inlet 41, and the filter 45 and the battery 14 are connected by a duct 46. Further, a discharge fan 47 is arranged at the cooling air outlet 43, and the battery 14 and the discharge fan 47 are connected by a duct 48. The air that has passed through the filter 45 at the cooling air inlet 41 is guided into the battery 14 by the duct 46, and the air that has cooled the battery 14 is guided by the duct 48 to the discharge fan 47 at the cooling air outlet 43, and the rear frame by the discharge fan 47. It is discharged into the inner space 124. The air discharged into the space 124 increases the amount of air flowing into the space 124 as described above, and contributes to cooling of the generator 11 and the electric motor 12 disposed in the space 124.
[0056]
In the battery case 15 configured as described above, the filter 45 is disposed at the cooling air inlet 41, so that mud, dust, and the like can be prevented from flowing into the cooling air flowing into the battery 14. Further, the amount of air flowing in and out by the ducts 46 and 48 can be secured stably. Furthermore, since the discharge fan 47 is provided at the cooling air outlet 43, the direction of the air discharged into the space 124 can be defined. In addition, by controlling the driving / stopping of the discharge fan 47, the battery 14 can be temperature-controlled at an appropriate temperature.
[0057]
A second embodiment of the present invention will be described with reference to FIGS. In the figure, members equivalent to those shown in FIGS. 1 and 2 are denoted by the same reference numerals.
[0058]
In the present embodiment, a battery case 50 that also serves as a support bracket for the seat 111 a is disposed below the seat 111 a of the driver's seat 111 in the cab 110 in the driver's cab 110. 4a, 4b, inverter / converter 17, and air conditioner unit 51 are arranged. The battery case 50 is provided with a cooling air inlet 52 and the floor 108 is provided with cooling air outlets 53a, 53b, 53c (hereinafter represented by "53"), and the batteries 4a, 4b and the inverter / converter 17 are floated by the spacer 54. And support.
[0059]
The air sucked into the battery case 50 from the cab 110 is discharged as cooling air from the air conditioner unit 51 to cool the batteries 4a and 4b and the inverter / converter 17. Cooling air that has cooled the batteries 4 a and 4 b and the inverter / converter 17 is discharged from the cooling air outlet 52 to the front space 124 of the rear frame 106, and the air is sucked from the front and lower portions of the rear frame 106 by the fan 122. The generator 11 and the electric motor 12 arranged in the front space 124 of the frame 106 are cooled and discharged to the rear part of the vehicle body.
[0060]
The air conditioner unit 51 may also be used as an air conditioner unit that cools the cab 110. In this case, for example, the air conditioner unit 51 in the battery case 50, the batteries 4a and 4b, and the inverter / converter 17 are partitioned, a cooling air distribution duct is provided in the air conditioner unit 51, and the batteries 4a and 4b in the battery case 50 are provided. By adjusting the distribution flow rate of the cooling air discharged to the inverter / converter 17 side and the cab 110 side, the cooling air of the air conditioner unit 51 can be sent to the batteries 4a and 4b and the inverter / converter 17.
[0061]
According to the present embodiment configured as described above, the following effects can be obtained.
[0062]
1. The generator 11 and the electric motor 12 are disposed below the cab 110 at the front of the rear frame 106, and the battery is placed on the floor 108 below the driver seat 111a in the cab 110 near the front of the rear frame 106. 14 and the inverter / converter 17 are arranged, the battery 14 and the inverter / converter 17 are located in the vicinity of the generator 11 and the electric motor 12, and between the generator 11, the electric motor, the inverter / converter 17, and the battery 14. The connection cables A, B, and C (see FIG. 3) are shortened, noise generation in the surrounding electrical equipment, the signal line D, and the like is reduced, and the operation reliability can be improved.
[0063]
2. Since the lower side of the seat 110a in the cab 110 is a place isolated from the heating elements such as the generator 11 and the electric motor 12 disposed in the front space 124 of the engine 121 and the rear frame 106, the battery 14 and the inverter / The arrangement position of the converter 17 is a place where there is little influence due to the temperature change inside the vehicle body (inside the rear frame 106), the battery 14 is unlikely to become high temperature, and the performance of the battery 14 can be fully exhibited, and the inverter / converter 17 Is prevented from becoming too hot.
[0064]
3. Since the battery 14 and the inverter / converter 17 are disposed in the vicinity of the generator 11 and the electric motor 12 in a space, there is easy maintenance of the battery 14 and the inverter / converter 17.
[0065]
4). The air that has cooled the battery 14 and the inverter / converter 17 flows out from the cooling air outlet 53 provided on the floor 108, and the front space of the rear frame 106 together with the air sucked from the front and lower portions of the rear frame 106 by the fan 122. Since the air flows into the space 124, the amount of air flowing into the space 124 increases, and the generator 11 and the electric motor 12 disposed in the space 124 can be appropriately cooled.
[0066]
5. Since the battery 14 and the inverter / converter 17 are cooled by the cooling air from the air conditioner unit 51, the cooling effect is enhanced, and the cooling air flows into the front space 124 of the rear frame 106, and the amount of air flowing into the space 124 Therefore, the cooling effect of the devices arranged in the space 124 can be further enhanced.
[0067]
As in the embodiment described with reference to FIGS. 5 and 6, a duct is provided between the air conditioner unit 51 and the battery 14 and between the battery 14 and the cooling air outlet 53 of the floor 108. A fan may be provided, whereby the cooling effect of the battery 14 can be further enhanced.
[0068]
In the above embodiment, the battery 14 is completely stored in the cab 110. However, as shown in FIG. 10, the battery 14A has a stepped shape, and a part of the battery 14A projects into the space below the floor 108. This may increase the capacity of the battery 14.
[0069]
【The invention's effect】
According to the present invention, it is possible to shorten the connecting cables by appropriately arranging the generator, the inverter, the battery, and the electric motor, and it is possible to improve the reliability of the electric drive operation.
[0070]
In addition, according to the present invention, the battery and the inverter / converter are arranged in a place where there is little influence due to the temperature change inside the vehicle body and there is enough space, so that the battery performance can be sufficiently exhibited and the battery and the inverter / Maintenance of converter becomes easy.
[0071]
Furthermore, according to the present invention, the generator and the electric motor can be appropriately cooled by guiding the air that has cooled the battery to the arrangement space of the generator and the electric motor.
[Brief description of the drawings]
FIG. 1 is a partially transparent side view of a wheel loader which is an electrically driven wheel type work vehicle according to a first embodiment of the present invention.
FIG. 2 is a top view of the wheel loader shown in FIG. 1 with the cab at the rear of the vehicle body removed.
3 is a diagram showing an electric drive system of the wheel loader shown in FIG. 1. FIG.
4 is a perspective view of a rear frame 106 at the rear of the vehicle body shown in FIG. 2. FIG.
FIG. 5 is a side view showing a state where a case front portion of the battery case is removed.
FIG. 6 is a top view showing a state in which a case upper part of the battery case is removed.
FIG. 7 is a partially transparent side view of a rear part of a vehicle body of a wheel loader which is an electrically driven wheel type work vehicle according to a second embodiment of the present invention.
8 is a top view of the wheel loader vehicle body shown in FIG.
9 is a top view showing a state in which a driver's cab floor at the rear of the wheel loader vehicle body and a case upper part of the battery case shown in FIG. 7 are removed. FIG.
FIG. 10 is a partially transparent side view of the rear part of a vehicle body of a wheel loader according to a modification of the second embodiment.
[Explanation of symbols]
11 Generator
12 Electric motor
13 Mission
14 (14a, 14b) battery
14A battery
15 (15a, 15b) Battery case
16 Bracket
17 Inverter / Converter
20 controller
21 Accelerator lever
22 Forward / reverse selector lever
30a, 30b Side plate
31a, 31b End plate
32 Mainframe
38a, 38b Support bracket
41 Cooling air inlet
43 Cooling air outlet
45 Filter
46,48 duct
47 fans
50 battery case
51 Air conditioner unit
52 Cooling air inlet
53 (53a, 53b, 53c) Cooling air outlet
54 Spacer
100 Wheel loader (wheel work vehicle)
101 Body front
102 Car body rear
103 Front wheel
104 Front working device
105 Rear wheel
106 Rear frame (body frame)
107 prop
108 cab floor
110 cab
111 Driver's seat
111a Driver's seat
121 engine
122 fans
123 radiator
124 Rear frame front space
A, B, C cable
D signal line

Claims (8)

In an electrically driven wheel type work vehicle equipped with an engine at the rear of the body frame and a driver's cab on the front upper side of the body frame,
An electrically driven wheel type work characterized in that a generator and an electric motor are disposed in a front space of the body frame below the cab, and a battery and an inverter / converter are disposed in the vicinity of the front portion of the body frame. vehicle. In the electrically driven wheel type work vehicle according to claim 1,
An electrically driven wheel-type work vehicle characterized in that the battery is disposed outside a lateral side portion of the body frame, and the inverter / converter is disposed below a seat in the driver's cabin. In the electrically driven wheel type work vehicle according to claim 2,
An electrically driven wheel-type work vehicle characterized in that the battery is arranged symmetrically on both lateral sides of the body frame. In the electrically driven wheel type work vehicle according to claim 1,
An electrically driven wheel-type work vehicle, wherein the battery and the inverter / converter are disposed below the seat in the driver's cab. In the electrically driven wheel type work vehicle according to claim 1,
An electrically driven wheel-type work vehicle characterized in that the battery is air-cooled and the air after battery cooling is discharged to the front space of the body frame. In the electrically driven wheel type work vehicle according to claim 5,
An electrically driven wheel type work vehicle characterized in that the air for cooling the battery is used as cooling air from an air conditioner unit. In the electrically driven wheel type work vehicle according to claim 5,
An electrically driven wheel type work vehicle, wherein the air after the battery is cooled is discharged to a front space of the body frame by a fan. A vehicle body front portion and a vehicle body rear portion each having a front wheel and a rear wheel and connected to each other so as to be relatively rotatable, and an engine is mounted on a rear portion of a box-shaped rear frame which is a vehicle body frame at the rear of the vehicle body, In an electrically driven wheeled work vehicle equipped with a driver's cab on the upper front side of the rear frame,
A generator and an electric motor are arranged in the front space of the rear frame below the cab, and the battery is arranged symmetrically on both outer sides of the lateral side of the vehicle rear frame, near the front of the rear frame. An electrically driven wheel-type work vehicle having an inverter / converter.

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