JP2013087620A - Road-paving vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric road-paving vehicle with high durability and reliability.SOLUTION: A road-paving vehicle includes an engine 11, a generator 12, electric motors 21 through 23, a control box 18, a radiator 15, a fan 13 and the like. The generator 12 generates electricity by being driven by the engine 11. The electric motors 21 through 23 drive predetermined devices of the road-paving vehicle by power from the generator 12. The control box 18 controls the electric motors 21 through 23. The radiator 15 is configured to cool hot air from the engine. The fan 13 suctions the hot air from the engine 11 and exhausts the suctioned air outside of the road-paving vehicle. The control box 18 is disposed at a position where the airflow from the fan 13 is oriented from the control box 18 toward the engine 11.

Description

  The present invention relates to a road pavement vehicle that performs asphalt pavement, and more particularly to an electric road pavement vehicle that electrically drives at least some of the devices.

  2. Description of the Related Art Conventionally, road paving vehicles such as asphalt finishers employ a hydraulic drive system in which a hydraulic pump is driven by an engine and an actuator such as a hydraulic motor is driven by pressure oil discharged from the hydraulic pump. In road paved vehicles that adopt a hydraulic drive structure, the intake and exhaust methods include a method of sucking cool outside air into the vehicle body in order to increase the cooling efficiency of the oil cooler that cools the hydraulic oil and the radiator of the engine. It has been adopted.

  On the other hand, an electric drive system has also been proposed in which some actuators (for example, motors used for traveling mechanisms, screeds, etc.) of road paved vehicles are electrically driven (see, for example, Patent Document 1). That is, a road pavement vehicle is also proposed in which a generator is driven by an engine and electric power generated by the generator is used as a power source for an actuator.

JP-A-4-269204

  In the conventional hydraulic drive system, the hydraulic oil is cooled by an oil cooler, so that the functions and reliability of the hydraulic pump, control valve, and hydraulic motor, which are the main structures, are maintained even when the ambient temperature in the vehicle body becomes high. There is no decline. Therefore, in the conventional hydraulic drive system, there is no problem in adopting a system for sucking outside air into the vehicle body as an intake / exhaust system.

  On the other hand, in the electric drive system, since the power transmission efficiency is improved as compared with the hydraulic drive system, the amount of heat generated as a power loss is reduced, but heat is generated from the engine, radiator, muffler, and the like. In addition, in the electric drive system, durability and reliability at high temperatures are not sufficient for a control device for controlling an electric actuator. Therefore, if the method of performing intake into the vehicle body is adopted as in the case of the conventional hydraulic drive system, the temperature inside the vehicle body becomes high, resulting in a shortened life of the control device or the like, or an unstable operation. There is a fear.

  Therefore, an object of the present invention is to provide an electric road pavement vehicle having high durability and reliability.

The present invention, in order to solve the above problems, adopting the structure of the lower SL.

The present invention is a road paving vehicle that performs asphalt paving. The road pavement vehicle includes an engine, a generator, an electric motor, an electric control unit, a cooling unit, and an exhaust unit. The generator generates electricity by driving the engine. The electric motor drives a predetermined device of the road pavement vehicle with electric power from the generator. The electric control unit controls the electric motor. The cooling unit is for cooling hot air from the engine. Exhaust unit sucks the hot air by the engine to discharge the sucked air to the outside of the vehicle of a road paving vehicle. The electric control unit is disposed at a position where the air flow from the exhaust unit is directed from the electric control unit to the engine.

According to the configuration of the upper SL, the flow of air by the exhaust portion within the vehicle body becomes the direction from the electric control unit to the engine, air heated by the engine is exhausted to the outside of the vehicle body. Therefore, the hot air generated in the engine is discharged to the outside without flowing into the electric control unit, and the electric control unit is not exposed to the hot air, so that the electric control unit can be prevented from reaching a high temperature. As a result, it is possible to improve the durability and reliability of the electric control unit and thus the road paved vehicle.

  According to the present invention, the electric control unit becomes a high temperature by making the exhaust unit to be a discharge type and arranging the respective components so that the air flow by the exhaust unit is directed from the electric control unit to the engine in the vehicle body. This can be prevented. As a result, it is possible to provide an electric road paved vehicle with high durability and reliability.

External configuration diagram of asphalt finisher according to the present embodiment View of the internal structure of the car body from above View of the internal structure of the car body from the side View of the internal structure of the car body from the front The figure which shows arrangement | positioning of each structure in the vehicle body which concerns on the modification of this embodiment.

  Hereinafter, an asphalt finisher according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external configuration diagram of an asphalt finisher according to the present embodiment. The asphalt finisher 1 according to the present embodiment can reduce energy consumption by electrically driving main actuators (driving motors such as travel mechanisms, conveyors, and screws).

[1. Overall composition of asphalt finisher]
First, the overall configuration of the asphalt finisher 1 will be described. In FIG. 1, the asphalt finisher 1 includes a vehicle body 2 and a screed device 9. The vehicle body 2 includes a hopper 3, a front wheel 4, a rear wheel 5, a conveyor 6, and a screw 7. The front wheels 4 and the rear wheels 5 are traveling mechanisms of the asphalt finisher 1, the front wheels 4 are steering wheels, and the rear wheels 5 are drive wheels. The hopper 3 is provided at the front portion (the x-axis positive direction side shown in FIG. 1) of the vehicle body 2 and receives asphalt mixture from the supply side (dump truck or the like). The conveyor 6 is provided from the lower side of the hopper 3 to the rear part of the vehicle body 2 and conveys the asphalt mixture received by the hopper 3 to the rear. The screw 7 diffuses the asphalt mixture conveyed by the conveyor 6 to the road surface while widening in the left-right direction. The screed device 9 spreads and leveles the asphalt composite material diffused on the road surface. The screed device 9 is connected to the vehicle body 2 in a vertically movable manner by the leveling arm 8, and the height of the screed device 9 is adjusted as appropriate. The driver's seat is provided behind the vehicle body 2 (above the screed device 9).

  With the above configuration, the asphalt finisher 1 diffuses the asphalt mixture supplied to the hopper 3 from the rear screw 7 to the road surface via the conveyor 6, and the diffused asphalt mixture is uniformly and flatly converted by the screed device 9. Paving with pressure. The configuration shown in FIG. 1 may be the same as that of a conventional asphalt finisher. Moreover, the structure shown in FIG. 1 is an example, and this invention is applicable to arbitrary road paving vehicles (road paving machine). The configuration of the asphalt finisher 1 shown in FIG. 1 is an example, and the configuration of the asphalt finisher 1 is not limited to the above. For example, in other embodiments, the asphalt finisher 1 may include a tamper device for paving and solidifying a road surface, a tamper heating device for heating the tamper device, and the like. The screed device 9 may have a main screed and a telescoping screed and may be configured to be stretchable.

[2. Arrangement of components in the car body]
Next, the arrangement of each component provided in the vehicle body 2 will be described. 2 to 4 are diagrams showing the arrangement of each component in the vehicle body 2. 2 is a view of the internal structure of the vehicle body 2 as viewed from above, FIG. 3 is a view of the internal structure of the vehicle body 2 as viewed from the side, and FIG. 4 is a view of the internal structure of the vehicle body 2 as viewed from the front. is there. 2 to 4 mainly show the configuration related to the present invention among the configurations provided in the asphalt finisher 1, and the configurations of the conveyor 6 and the screw 7 are illustrated for the purpose of making the drawings easy to understand. Omitted. In this embodiment, as shown in FIGS. 2 to 4, by adopting the arrangement and intake / exhaust method of each device such that the electric control device (control box 18) that controls the electric actuator does not reach a high temperature, The durability and reliability of the asphalt finisher 1 are improved. Hereinafter, the detail of each structure provided in the vehicle body 2 is demonstrated.

  The asphalt finisher 1 includes an engine 11 and a generator 12. The engine 11 as a power source is mechanically connected to the generator 12 and rotates the generator 12. The engine 11 is typically a diesel engine, but may be other types of engines. As shown in FIGS. 2 and 3, in the present embodiment, the engine 11 is arranged on the front side (the x-axis positive direction side shown in FIG. 2) in the housing 10 of the vehicle body 2.

  The generator 12 generates power by driving the engine 11. In the present embodiment, the generator 12 is a three-phase AC synchronous generator, but the type of the generator 12 may be any type. Although not shown, the generator 12 is electrically connected to the control box 18, and the three-phase AC electrical output from the generator 12 is input to the control box 18. As shown in FIGS. 2 and 4, in the present embodiment, the generator 12 is disposed on the side (y-axis direction side) of the engine 11.

  The asphalt finisher 1 includes a cooling unit (radiator 15) for cooling hot air from the engine 11. The asphalt finisher 1 includes an exhaust unit that sucks air around the engine 11 (hot air from the engine 11) and discharges the sucked air to the outside of the vehicle body of the asphalt finisher 1. Although the specific configuration of the exhaust unit may be any, in the present embodiment, the asphalt finisher 1 includes a fan 13, an exhaust pipe 14, a muffler 16, and an exhaust chamber 17 as the exhaust unit. .

  As shown in FIGS. 2 and 4, in the present embodiment, the cooling unit and the exhaust unit are arranged on the side of the engine 11. Specifically, a fan 13, a radiator 15, and an exhaust chamber 17 are sequentially arranged on the side of the engine 11 from the inside. The fan 13, the radiator 15, and the exhaust chamber 17 are connected to each other. In the present embodiment, the fan 13 is an exhaust type (a discharge type), and sucks air from the engine 11 side and discharges it to the radiator 15 side (see the dotted arrow shown in FIG. 4). Therefore, the air on the engine 11 side is sucked by the fan 13 and flows into the exhaust chamber 17 via the radiator 15. The upper surface of the exhaust chamber 17 is constituted by the upper surface of the housing 10, and an exhaust port is formed on the upper surface. Therefore, the air that has flowed into the exhaust chamber 17 is discharged upward of the vehicle body 2 (see the dashed-dotted arrows shown in FIGS. 3 and 4).

  The radiator 15 which is a cooling unit cools the hot air of the engine 11 discharged by the exhaust unit. Note that the specific arrangement position of the radiator 15 is not limited to the above-described embodiment, and may be arranged at a position where the hot air from the engine 11 can be cooled.

  Further, as shown in FIG. 2, a muffler 16 is connected to the engine 11 via an exhaust pipe 14. The exhaust from the engine 11 is exhausted from the muffler 16 through the exhaust pipe 14. Here, in the present embodiment, the exhaust unit discharges the exhaust of the engine 11 together with the sucked air in the vehicle body 2 to the upper side of the vehicle body 2. Specifically, the muffler 16 is provided inside the exhaust chamber 17 and exhausts the exhaust of the engine 11 into the exhaust chamber 17 (upward) (see the dashed-dotted arrows shown in FIGS. 3 and 4). . Therefore, the exhaust from the engine 11 is exhausted from the exhaust chamber 17 to the upper side of the vehicle body 2 together with the hot air in the housing 10 (hot air from the engine 11) exhausted by the fan 13. As described above, in the present embodiment, the exhaust of the engine 11 is raised upward of the vehicle body 2 together with the exhaust air exhausted by the exhaust part, so that black smoke contained in the exhaust of the engine 11 is generated in the asphalt in the hopper 3. It can prevent falling on the composite material.

  In the present embodiment, the asphalt finisher 1 exhausts the vehicle body 2 upward, so that hot air (exhaust gas) is sent to the driver behind the vehicle body 2 and workers and passersby around the asphalt finisher 1. You can avoid hitting it. In other embodiments, the exhaust direction by the exhaust unit is arbitrary, and the exhaust is not limited to the upper side of the vehicle body. For example, the exhaust may be performed sideways.

  The asphalt finisher 1 includes an electric motor (each motor 21 to 23). The electric motor drives a predetermined device of the asphalt finisher with electric power from the generator 12. In the present embodiment, the predetermined devices are a traveling mechanism, a conveyor 6 and a screw 7, and the asphalt finisher 1 includes three motors 21, a conveyor motor 22, two conveyor motors 22, and two screw motors 23. An electric motor is provided. The traveling motor 21 is mechanically connected to the mission 19, and the mission 19 is mechanically connected to the rear wheel 5 (not shown) via a drive shaft 24. The traveling motor 21 drives the rear wheel 5 via the mission 19 and the drive shaft 24. The two conveyor motors 22 drive the left and right conveyors included in the conveyor 6 one by one. The two screw motors 23 drive the left and right two screws included in the screw 7 one by one. The predetermined device driven by the electric power from the generator 12 may be any device. For example, in other embodiments, the asphalt finisher 1 may electrically drive a device that heats the screed or may electrically drive a tamper device.

  As shown in FIGS. 2 and 3, the motors 21 to 23 are disposed behind the engine 11. Specifically, in the housing 10, a traveling motor 21 is disposed behind the engine 11, and a conveyor motor 22 is disposed behind the traveling motor 21. The screw motor 23 is disposed behind the outside of the housing 10.

  The asphalt finisher 1 includes an electric control unit (control box 18) that controls the electric motor. The control box 18 is electrically connected to the motors 21 to 23 and controls the operations of the motors 21 to 23. Although the specific configuration of the control box 18 may be any, in the present embodiment, the control box 18 includes a controller and three inverters that respectively control the motors 21 to 23. ing. The controller controls each inverter based on an operation instruction or the like from an operator (operator). Each inverter drives the motors 21 to 23 by converting the three-phase AC power supplied from the generator 12 into a desired frequency and outputting the same.

  As shown in FIGS. 2 and 3, in the present embodiment, the control box 18 is disposed behind the engine 11. Here, since the exhaust part sucks the air in the vehicle body 2 and discharges it outside the vehicle body 2, the control box 18 is arranged at a position where the air flow by the exhaust part is directed from the control box 18 to the engine 11. Will be. Specifically, the engine 11 is disposed at a position closer to the suction portion (fan 13) of the exhaust section, and the control box 18 is disposed at a position farther away. As a result, the hot air generated in the engine 11 does not flow toward the control box 18 but is discharged to the outside, and the control box 18 is exposed to air that is not heated by the engine 11. This can be prevented. As a result, the durability and reliability of the control box 18 and the asphalt finisher 1 can be improved.

  In the present embodiment, the control box 18 is disposed at a position near the upper end in the housing 10, in other words, at a position above the motors 21 and 22 or the mission 19. Here, when the asphalt finisher 1 is operated, high-temperature (about 150 ° C.) asphalt mixture is conveyed by the conveyor 6 below the vehicle body 2, so that the hot air of the asphalt mixture is also transmitted to the vehicle body 2. For this reason, by disposing the control box 18 upward in the housing 10, it is possible to prevent the control box 18 from being heated to a high temperature by the hot air.

  In the present embodiment, two control boxes 18 are provided, one on each of the left and right sides of the housing 10, but in other embodiments, the number of control boxes 18 may be any number.

  Furthermore, in the present embodiment, the engine 11 is disposed behind the hopper 3, so the engine 11 is disposed between the hopper 3 and the control box 18 (see FIG. 2). According to this, even if the hot air of the asphalt mixture at a high temperature (about 150 ° C.) in the hopper 3 is transmitted to the engine 11, it is exhausted by the exhaust part around the engine 11. It is possible to prevent the control box 18 from reaching a high temperature.

  Moreover, in this embodiment, since each electric motor 21-23 is also arrange | positioned behind the engine 11 similarly to the control box 18, also about each electric motor 21-23, it becomes high temperature with the hot air which generate | occur | produces in the engine 11. Can be prevented.

  In the present embodiment, the asphalt finisher 1 includes a partition plate 20. The partition plate 20 is disposed between the engine 11 and the control box 18 in the housing 10 (see FIGS. 2 and 3). In the present embodiment, as shown in FIG. 3, the partition plate 20 is connected to the upper surface of the housing 10 and partitions the upper portion of the housing 10. Note that any material may be used for the partition plate 20, but in the present embodiment, the partition plate 20 is a steel plate. As described above, since the partition plate 20 is provided between the engine 11 and the control box 18, it is possible to prevent the hot air from the engine 11 from directly hitting the control box 18 and to prevent the control box 18 from becoming hot. Can be prevented.

  As shown in FIG. 3, in the present embodiment, the partition plate 20 partitions the upper side of the housing 10 including the engine 11 and the control box 18 therein, and a gap is generated below the position of the control box 18. Is provided. That is, in the housing 10, the space on the engine 10 side and the space on the control box 18 side are connected at a position below the control box 18 (lower end). Therefore, in the space on the control box 18 side, an air flow toward the space on the engine 10 side is generated below the control box 18 (see the dotted arrow shown in FIG. 3). Accordingly, it is possible to prevent the hot air of the asphalt mixture conveyed by the conveyor 6 below the vehicle body 2 from being transmitted to the control box 18 and to prevent the control box 18 from becoming high temperature.

  As described above, according to the present embodiment, a discharge-type discharge unit is employed, the air flow in the vehicle body 2 is directed from the control box 18 to the engine 11, and hot air from the engine 11 is discharged to the outside of the vehicle body 2. To be configured. Thus, by preventing the control box 18 from becoming hot, durability and reliability can be improved in the electric drive type asphalt finisher 1.

[3. Modified example]
The arrangement of each component provided in the vehicle body 2 is not limited to the above-described embodiment, and may be another configuration / arrangement as long as the hot air from the engine 11 does not hit the control box 18. For example, in other embodiments, each configuration may be arranged as in the following modification.

  FIG. 5 is a diagram illustrating an arrangement of each component in the vehicle body 2 according to a modification of the embodiment. FIG. 5 is a view of the internal configuration of the vehicle body 2 as viewed from above. 5, the same components as those in FIG. 2 are denoted by the same reference numerals as those in FIG. 2, and detailed description thereof is omitted.

  In this modification, the function and operation of each component are the same as those in the above embodiment, and the arrangement of some components is different from that in the above embodiment. As shown in FIG. 5, in this modified example, the configuration relating to traveling such as the traveling motor 21 and the transmission 19 is not arranged in the vehicle body 2. In this modification, these configurations are arranged in the wheels of the asphalt finisher 1 or in the crawler (when the asphalt finisher 1 is a crawler type).

  In the present modification, the exhaust unit, the engine 11, and the generator 12 are arranged in order from the front in the housing 10 of the vehicle body 2. In the present modification, the traveling motor 21, the transmission 19 and the like are not arranged in the casing 10, and therefore the exhaust part, the engine 11, and the generator 12 can be arranged in the front-rear direction as shown in FIG. . The arrangement of the control box 18, the conveyor motor 22, and the screw motor 23 is the same as in the above embodiment.

  As described above, in the present modification, the cooling unit and the exhaust unit are disposed in front of the engine 11, the generator 12 is disposed in the rear of the engine 11, and the control box 18 includes the engine 11 and the generator 12. It is arranged on the side. Here, also in the present modified example, as in the above-described embodiment, the exhaust unit sucks air in the vehicle body 2 and discharges it outside the vehicle body 2. Therefore, the control box 18 is arranged at a position where the air flow from the exhaust portion is directed from the control box 18 to the engine 11. Accordingly, in the present modification as well, as in the above embodiment, the hot air generated in the engine 11 is discharged outside without flowing into the control box 18, thereby preventing the control box 18 from reaching a high temperature. Can do. As a result, the durability and reliability of the control box 18 and the asphalt finisher 1 can be improved.

  In addition, in the said modification, it was the structure by which a partition plate is not provided in the housing | casing 10, However, You may make it provide a partition plate in the housing | casing 10 in other embodiment. For example, a partition plate extending in the front-rear direction from the front wall of the housing 10 to the side of the engine 11 may be provided. Moreover, it is preferable that this partition plate partitions off the upper side of the housing | casing 10 similarly to the said embodiment, and is provided so that a clearance gap may arise in the lower side rather than the position of the control box 18. FIG.

  In the above embodiment, the asphalt finisher has been described as an example. However, the present invention can also be used for any road paving vehicle (road paving machine) that performs asphalt paving with a screed, such as a repuber or a remixer. is there.

  As described above, the present invention can be used for road paving vehicles such as asphalt finishers for the purpose of providing an electric road paving vehicle with high durability and reliability.

DESCRIPTION OF SYMBOLS 1 Asphalt finisher 2 Car body 3 Hopper 4 Front wheel 5 Rear wheel 6 Conveyor 7 Screw 8 Leveling arm 9 Screed 10 Housing 11 Engine 12 Generator 13 Fan 14 Exhaust pipe 15 Radiator 16 Muffler 17 Exhaust chamber 18 Control box 20 Partition plate 21 For travel Motor 22 Conveyor motor 23 Screw motor

Claims (1)

A road paving vehicle that performs asphalt paving,
Engine,
A generator for generating electricity by driving the engine;
An electric motor that drives a predetermined device of the road paved vehicle with electric power generated by the generator;
An electric control unit for controlling the electric motor;
A cooling unit for cooling hot air from the engine;
It sucked hot air by the engine, the sucked air and an exhaust portion for discharging to outside of the road paving vehicle,
The electric control unit is a road pavement vehicle that is disposed at a position where an air flow from the exhaust unit is directed to the engine from the electric control unit.

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