JP2008207719A - Automobile for supplying electric power/compressed air and automobile for tire replacing work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automobile for supplying electric power/compressed air capable of suppressing an adverse effect on an environment and making good use of a space on a load carrying platform effectively. <P>SOLUTION: A direct current obtainable from a first alternator 121 by using an engine 11 for travelling as power is converted into a first AC current by a first power converting means 141, and an electric air compressor 15 is operated by the first AC current, thereby obtaining the compressed air. Moreover, the direct current obtainable from the first alternator 121 is converted by a second power converting means 142, thereby obtaining the AC current used in various instruments. The fact that the engine 11 satisfying stiff environment standards is used as power and a dedicated engine is not used separately as the power of the air compressor can suppress the adverse effect on the environment. Furthermore, the fact that the dedicated engine is not used in this manner allows the air compressor to be arranged under a floor. Accordingly, the space on the load carrying platform can be used practically. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric power / compressed air supply vehicle that supplies electric power and compressed air necessary for operating a device mounted on a vehicle or a device on the destination at a destination where the vehicle is driven. This electric power / compressed air supply vehicle can be applied to, for example, a tire replacement work vehicle in which a tire is removed from a wheel and a replacement work for attaching the tire to the wheel is performed.

  It is necessary to dispatch a vehicle equipped with equipment necessary for work at a place where a broken vehicle is located or at a construction site to perform work on the site. In recent years, even when it is less necessary for an operator to visit the site, there are cases where the operator travels to a location desired by the customer for work for the customer. In order to perform such a business trip service, it is necessary to secure power for operating the work equipment at a business trip destination. Therefore, conventionally, a power source is mounted on a business trip vehicle together with a working device.

  As an example of a vehicle equipped with such work equipment, there is a tire replacement work vehicle that removes a tire from a wheel and attaches the tire to the wheel. When a transporter or a business operator who has a large number of sales vehicles for customers is a customer, the customer transports a large number of vehicles to the tire replacement operator's factory when regularly replacing the tires of a large number of vehicles. In addition, it is preferable in terms of service to the customer that the tire replacement operator goes to the customer to perform the work, and the rationality is high.

  When an automobile tire is attached to or removed from a foil, a tire changer that can be easily operated without damaging the tire and the foil is usually used. In addition, after attaching the tire to the foil, in order to confirm that the tire with the foil rotates smoothly without causing vibration, an inspection is performed with a wheel balancer. Adjust the balance by attaching. An automobile for tire replacement work is one in which these tire changer and wheel balancer are mounted on a cargo bed. In addition, the tire replacement work automobile can be equipped with a compressed air filling device for filling the tire with air, a jack for lifting the automobile to be worked, or the like. Electric power is used for operations of a tire changer, a wheel balancer, and the like, and compressed air is used for operations of a compressed air filling device, a jack, and the like.

  Patent Document 1 discloses an alternator that generates electric power using a traveling engine as a motive power, a working battery charged by the alternator, and an inverter that converts a direct current of the working battery into an alternating current and supplies the alternating current to a tire changer or a wheel balancer. A vehicle for tire replacement work is provided. In this tire replacement work vehicle, since the electric power generated by the alternator during traveling is used as a work battery, an alternating current is supplied from the inverter to the tire changer or wheel balancer while the traveling engine is stopped. Can do.

JP 2005-225352 A ([0029])

  The vehicle for tire replacement work of Patent Document 1 is equipped with a dedicated engine in addition to the traveling engine in order to drive a compressor (air compressor) that supplies compressed air. In this air compressor, air is compressed by transmitting the rotation of the shaft of the dedicated engine. This dedicated engine has a problem that it has an adverse effect on the environment due to noise, vibration, exhaust gas, etc., because environmental measures are not taken sufficiently as in the case of a highly regulated automobile engine. In particular, during the operation of the dedicated engine, precise measurement by a wheel balancer becomes difficult due to vibration. Further, since it is necessary to change oil or the like in a dedicated engine in addition to the traveling engine, maintenance work is required.

  Since the air compressor and the dedicated engine cannot be arranged apart from each other, a large installation space is required. Therefore, these air compressors and dedicated engines cannot be accommodated under the floor of the automobile and are unavoidably mounted on the cargo bed. Thereby, the problem that the work space and storage space on a loading platform become small arises. In particular, in tire replacement vehicles, it is necessary to transport new tires attached to wheels or old tires removed from the wheels, so the effect of restricting storage space is significant. It is necessary to prepare a separate car just for the purpose.

  So far, the tire replacement work automobile has been described as an example. However, the above-mentioned problem is caused by power / compressed air that requires both electric power and compressed air for work, such as rescue cars and automobiles for civil engineering and construction work. This is common to supply vehicles.

  The problem to be solved by the present invention is that it can suppress adverse effects on the environment due to noise, vibration, exhaust gas, etc., and can effectively use the space on the cargo bed and the vehicle for supplying power and compressed air, and tire removal. It is to provide a replacement vehicle.

An automobile for supplying power and compressed air according to the present invention, which has been made to solve the above problems,
a) an alternator that generates direct current using the traveling engine as power,
b) first power conversion means for converting a part of the direct current into a first alternating current;
c) an electric air compressor operated by the first alternating current;
d) a second power conversion means for converting a part of the direct current to a second alternating current connected to the alternator electrically in parallel with the first power conversion means;
e) an air tank for storing compressed air obtained by the electric air compressor;
f) The pressure in the air tank is detected, and when the pressure falls below a predetermined lower limit value, supply of the first alternating current from the first power conversion means is started, and the pressure reaches a predetermined upper limit value. A pressure control unit for terminating the supply of the first alternating current from the first power conversion means when
It is characterized by providing.

  The power / compressed air supply vehicle according to the present invention may include a battery that is charged by the alternator and supplies a direct current in parallel to the first power conversion means and the second power conversion means. The vehicle for supplying power / compressed air according to the present invention may include means for controlling the rotational speed of the traveling engine in an idling state.

  The electric air compressor is preferably provided under the floor of the cargo bed.

The power / compressed air supply vehicle according to the present invention further includes a second alternator that is provided separately from the alternator and generates a second DC current by using a traveling engine as power.
Third power conversion means for converting a part of the second DC current into a single-phase AC current having a voltage of 100 V, electrically connected to the second alternator. In that case, what converts a direct current into the three-phase alternating current of voltage 200V can be used for the said 2nd power conversion means. In addition, when the single-phase AC power required in this electric power / compressed air supply vehicle is small, the alternator attached to the commercially available vehicle as the base of the electric power / compressed air supply vehicle is used as it is. It can be used as a second alternator.

  The tire replacement vehicle according to the present invention is characterized in that a tire changer is electrically connected to the second power conversion means of the power / compressed air supply vehicle.

  In the tire replacement work vehicle according to the present invention, a tire changer is provided in the second power conversion unit of the power / compressed air supply vehicle having the third power conversion unit, and a wheel balancer is provided in the third power conversion unit. However, each may be electrically connected.

  In the vehicle for supplying electric power / compressed air according to the present invention, the air compressor is operated by the electric power generated by the traveling engine. It is possible to suppress adverse effects on the environment due to the above and malfunctions of mounted equipment (for example, a wheel balancer mounted on a tire replacement work vehicle). Further, unlike a dedicated engine-driven air compressor, it is not necessary to perform maintenance that requires labor, such as oil exchange, separately from the traveling engine.

  The electric air compressor operates only from the time when the pressure in the air tank becomes equal to or lower than a predetermined lower limit value to the time when the pressure reaches a predetermined upper limit value, and control of the rotational speed during that time is unnecessary. Therefore, the first power conversion means for generating the first alternating current for operating the electric air compressor can be an inexpensive one that only turns on / off the first alternating current, thereby reducing the cost. Is suppressed.

  By connecting a battery in parallel to the first power conversion means and the second power conversion means in the power / compressed air supply vehicle of the present invention, the second alternating current is used even when the traveling engine is stopped for a certain time. Various devices can be operated, and the influence on the environment and on-board devices can be further suppressed. In addition, when operating an electric air compressor that requires a large amount of power, the current supplied from the battery in addition to the current supplied from the alternator is used to reduce the load on the traveling engine (during normal idling) It can be used at the rotational speed).

  In the power / compressed air supply vehicle of the present invention, by providing means for controlling the rotational speed of the traveling engine in the idling state, when a large amount of power is required, the rotational speed of the traveling engine is increased, thereby Sufficient power can be generated.

  Since it is not necessary to use a dedicated engine for the air compressor in the power / compressed air supply vehicle of the present invention, they can be mounted under the floor of the vehicle instead of the loading platform. Therefore, a wide working space and storage space on the loading platform can be secured.

  In addition to the configuration of the present invention, as a configuration for operating an air compressor using a traveling engine, a PTO (Power Take Off) shaft connected to the traveling engine and a rotating portion of the air compressor are connected. Can be considered. In this way, there is a restriction that the air compressor must be arranged in the vicinity of the traveling engine when the PTO shaft is used. In the present invention, the first power conversion means and the electric air compressor are electrically connected. As long as this is done, there is no restriction on the positional relationship between the two. In addition, if a PTO shaft is used, a clutch for connecting / disconnecting the PTO shaft and the air compressor is provided to adjust the pressure in the compressed air tank, or when the pressure reaches the upper limit, The air needs to be released (the air compressor operates continuously). On the other hand, in the present invention, the pressure can be easily adjusted only by the ON / OFF control of the first power conversion means, and the durability is improved because it is not necessary to continuously operate the air compressor. Furthermore, the present invention is advantageous in that the PTO shaft can be used for applications other than the air compressor.

  An embodiment of an automobile for supplying power and compressed air according to the present invention will be described with reference to FIGS. 1 and 2. The power / compressed air supply vehicle of this embodiment is a modification of a commercially available 4t vehicle as a base. Here, a tire replacement work vehicle will be described as an example, but the same configuration can be used in a power / compressed air supply vehicle such as a rescue vehicle or a construction vehicle.

  FIG. 1 is a block diagram of an electric power system in a tire replacement work vehicle according to the present embodiment. A first alternator 121 and a second alternator 122 are connected to the traveling engine 11 of the automobile. The second alternator 122 uses the alternator of the base vehicle as it is. On the other hand, the first alternator 121 is added to the base vehicle, and has a capacity (apparent power) of 8 kVA having a larger capacity than the second alternator 122. Since the first alternator 121 needs to supply an external current to the field at the time of startup, a traveling battery 172 is connected to the field.

  An AVR (Automatic Voltage Regulator) 13 is connected to the first alternator 121. The AVR 13 converts the current generated by the first alternator 121 into a DC current having a voltage of 240V. A first power conversion unit 141 and a second power conversion unit 142 are connected to the AVR 13 in parallel. Each of the first power conversion unit 141 and the second power conversion unit 142 converts a DC voltage of 240 V into a three-phase AC voltage of 200 V and supplies an external power of 7.5 kVA to the outside. Each of the first power conversion means 141 and the second power conversion means 142 is provided with a start switch. By controlling this switch by a control device (not shown), the three-phase alternating current is turned on / off. can do.

  An electric air compressor 15 is connected to the first power conversion means 141. The electric air compressor 15 rotates the motor by a three-phase AC voltage of 200 V, thereby compressing the air. The power consumption of the electric air compressor 15 is 5.5 kW. The air compressed by the electric air compressor 15 is stored in the compressed air tank 19.

  Various devices using a three-phase AC voltage of 200V can be connected to the second power conversion unit 142. In the tire replacement vehicle according to the present embodiment, the tire changer 16 is connected to the second power converter 142. The tire changer 16 uses a three-phase AC voltage of 200V for the motor 161 of the hydraulic pump used for removing and attaching the tire and the motor 162 for rotating the tire. Both the power consumption of the motors 161 and 162 is 1.1 kW.

  In addition, the tire replacement vehicle according to this embodiment includes an additional battery 171 that is added separately from the traveling battery 172 and that charges and discharges a DC current of 240V. A first power conversion unit 141 and a second power conversion unit 142 are connected to the additional battery 171 in parallel. Thereby, the additional battery 171 can supply a direct current to the first power conversion unit 141 and the second power conversion unit 142, and the first power conversion unit 141 and the second power conversion unit 142 as described above. It can charge with the 1st alternator 121-AVR13 connected in parallel.

  On the other hand, the second alternator 122 is connected to the third power conversion means 143. The third power conversion means 143 converts the DC voltage of 24V obtained by the second alternator 122 into a single-phase AC voltage of 100V. The third power conversion means 143 is connected to a device that uses a single-phase AC voltage of 100 V, such as a wheel balancer 18, an air pressure regulator, and a lighting fixture. Further, a traveling battery 172 is connected to the third power conversion means 143.

  Although only one tire changer 16 is shown in FIG. 1 for the sake of simplicity, actually, as will be described later, a small tire changer 16A for exchanging the tires of a passenger car is used in the tire replacement work vehicle of this embodiment. A large tire changer 16B is provided for exchanging tires for trucks and buses. These tire changers 16A and 16B can be connected to the second power conversion means 142 in parallel. Only one tire changer may be mounted, or three or more tire changers may be mounted if the capacity of the first alternator 121 and the second power converter 142 and the space on the loading platform allow.

The operation of the tire replacement vehicle when power and compressed air are supplied to various devices will be described.
The electric power used for the tire changer 16 is obtained by converting the current obtained by the first alternator 121 into a DC current having a voltage of 240 V by the AVR 13 and converting the DC current into a three-phase AC having a voltage of 200 V by the second power converter 142. To the tire changer 16. The total power consumption of the motors 161 and 162 used in the tire changer 16 is 2.2 kW, whereas the first alternator 121 is a DC power with an apparent power of 8 kVA (the second power converter 142 has an apparent power of 7.5 kVA). AC power) can be supplied, and can be operated without the assistance of the additional battery 171 except when the electric air compressor 15 described later is operated.

  The electric power used by the wheel balancer 18 and the like is supplied after the electric power of the second alternator 122 is converted into a single-phase AC voltage of 100 V by the third electric power conversion means 143. Since the second alternator 122 has a relatively small power generation capacity, DC power is also supplied from the traveling battery 172 to the third power conversion means 143 when the power consumption of single-phase AC increases.

  On the other hand, the compressed air is converted from a 240V DC current obtained by the AVR 13 to a three-phase AC voltage 200V by the first power converter 141 as described above, and the electric air compressor 15 is operated by the three-phase AC. Is generated. The generated compressed air is stored in the compressed air tank 19 and taken out as necessary. Here, the first power conversion means 141 operates only from the time when the pressure in the compressed air tank 19 becomes equal to or lower than a predetermined lower limit to the time when the pressure reaches a predetermined upper limit. In order to operate the first power conversion means 141 in this way, a pressure sensor is provided in the compressed air tank 19 and a switch for turning ON / OFF the three-phase alternating current from the first power conversion means 141 is provided. This switch is operated by a control device (not shown) so that it is turned on when the pressure value obtained by the pressure sensor reaches the lower limit value and turned off when the pressure value reaches the upper limit value.

  Since the electric air compressor 15 requires 5.5 kW of electric power larger than that of the tire changer 16, during operation of the electric air compressor 15, the direct current power is also supplied from the additional battery 171 in addition to the direct current power from the AVR 13. It is supplied to the power conversion means 141 and the second power conversion means 142. The additional battery 171 is charged by a direct current from the AVR 13 when the electric air compressor 15 is not operating. Further, when the traveling engine 11 is stopped, the three-phase AC power is supplied to the tire changer 16 for a while by converting the DC power obtained from the additional battery 171 by the second power conversion means 142. Can do.

  In the tire replacement work vehicle (power / compressed air supply vehicle) of this embodiment, all of the power and compressed air can be obtained using the vehicle's traveling engine 11 that satisfies strict environmental standards as a power source.・ Suppresses adverse environmental effects caused by exhaust gas and malfunctions of mounted equipment. Further, unlike the case where the engine for power generation or the engine for driving the air compressor is used, it is not necessary to perform maintenance requiring labor such as oil exchange separately from the traveling engine 11.

  In the present embodiment, the first power conversion unit 141 does not need to control the voltage and frequency, and only needs to be able to turn on / off the alternating current, so that an inexpensive one can be used.

  Next, the arrangement of each device in the tire replacement work vehicle of the present embodiment will be described with reference to FIG. In FIG. 2, the arrangement is divided into (a) under the floor, (b) on the loading platform 22 and (c) near the ceiling of the vehicle for tire replacement work, and is shown in a plan view.

(a) Underfloor Under the floor of the cab 21, the traveling engine 11, the second alternator 122, and the traveling battery 172 are provided. These are provided in a base car (base car). In the present embodiment, a first alternator 121 is further provided under the floor of the cab 21. Below the floor of the loading platform 22, an electric air compressor 15, a compressed air tank 19, a fuel tank 23, and an air aryl 25 that houses a hose for supplying compressed air to tires and the like are provided. Since the air compressor described in Patent Document 1 has a dedicated engine and is mounted on the cargo bed, the electric air compressor 15 is smaller than the dedicated engine-type air compressor and is therefore mounted below the floor of the cargo bed 22. It is possible.

(b) On the loading platform 22 On the loading platform 22, a tire changer 16A for passenger cars, a tire changer 16B for buses and trucks, an additional battery 171, a wheel balancer 18, and a jack for raising and lowering a tire to be attached / removed. 26 etc. are installed. These devices are the same as those mounted on the loading platform of a conventional tire replacement vehicle, but in this embodiment, the electric air compressor 15 is mounted under the floor of the loading platform 22 as described above. A space 30 wider than the conventional one can be ensured on 22. This space 30 can be used as a work space. Or the storage shelf which accommodates the tire after replacement | exchange before / after replacement | exchange can be put in the space 30, and it becomes unnecessary to prepare the motor vehicle for tire conveyance separately in that case.

  A tilt-type hinged door 27 is provided on the left side of the loading platform 22, and a double-folded hinged door 28 is provided on the right side. The left side tilting door 27 is hinged to the edge of the loading platform 22 and can be used as a work table when it is opened. The hinged door 28 on the right side is mainly used for carrying in and out tires and the like. In addition, a power lift 29 is provided at the rear part of the loading platform 22 for carrying in and out heavy loads.

(c) Near the ceiling Two suspension racks 31 and 34 are provided near the ceiling of the loading platform 22. On the hanging shelf 31, the first power conversion means 141, the second power conversion means 142, the third power conversion means 143, the switchboard 32, and the air filler 33 are placed. The hanging shelf 34 can be used as a storage space.

  As an option, the vehicle for tire replacement work of the present embodiment can be provided with a control means 41 for rotational speed when the traveling engine 11 is idling, as shown in FIG. The rotation speed can be controlled, for example, by a user operating a pedal, a lever or the like provided in the driver's seat. By controlling the rotation speed during idling in this way, it is possible to increase the rotation speed when the amount of power used is large and generate sufficient power, and when the amount of use is small, the rotation speed can be reduced to save fuel. .

The block diagram of the electric power system in the vehicle for tire replacement work which is one Embodiment of the vehicle for electric power and compressed air supply which concerns on this invention. The top view which shows arrangement | positioning of each apparatus in the vehicle for tire replacement work of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Running engine 121 ... 1st alternator 122 ... 2nd alternator 141 ... 1st power converter 142 ... 2nd power converter 143 ... 3rd power converter 15 ... Electric air compressor 16 ... Tire changer 161 ... Hydraulic pump Motor 162 ... Tire rotating motor 16A ... Small tire changer 16B ... Large tire changer 171 ... Additional battery 172 ... Driving battery 18 ... Wheel balancer 19 ... Compressed air tank 21 ... Operating platform 22 ... Load platform 23 ... Fuel tank 25 ... Earyl 26 ... Jack 27 ... tilt-type work table 28 ... double door 29 ... power lift 30 ... space 31, 34 ... hanging shelf 32 ... switchboard 33 ... air filling device 41 ... rotational speed control means

Claims (7)

a) an alternator that generates direct current using the traveling engine as power,
b) first power conversion means for converting a part of the direct current into a first alternating current;
c) an electric air compressor operated by the first alternating current;
d) a second power conversion means for converting a part of the direct current to a second alternating current connected to the alternator electrically in parallel with the first power conversion means;
e) an air tank for storing compressed air obtained by the electric air compressor;
f) The pressure in the air tank is detected, and when the pressure falls below a predetermined lower limit value, supply of the first alternating current from the first power conversion means is started, and the pressure reaches a predetermined upper limit value. A pressure control unit for terminating the supply of the first alternating current from the first power conversion means when
An automobile for supplying electric power and compressed air, comprising:   The vehicle for supplying electric power and compressed air according to claim 1, further comprising a battery that is charged by the alternator and supplies a direct current in parallel to the first power conversion means and the second power conversion means.   The electric / compressed air supply automobile according to claim 1, wherein the electric air compressor is provided under a floor of a cargo bed.   The vehicle for supplying electric power and compressed air according to any one of claims 1 to 3, further comprising means for controlling a rotation speed of the traveling engine in an idling state. A second alternator that is provided separately from the alternator and generates a second direct current using a traveling engine as a power;
A third power conversion means that is electrically connected to the second alternator and converts a part of the second DC current into a single-phase AC current having a voltage of 100 V;
The second power conversion means converts a direct current into a three-phase alternating current having a voltage of 200V.
The vehicle for supplying electric power and compressed air according to any one of claims 1 to 4.   A tire change work vehicle, wherein a tire changer is electrically connected to the second power conversion means of the power / compressed air supply vehicle according to any one of claims 1 to 5.   6. A tire according to claim 5, wherein a tire changer is electrically connected to the second power conversion means, and a wheel balancer is electrically connected to the third power conversion means. Replacement vehicle.

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