JPH0725300B2 - 2t storage battery locomotive - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage battery locomotive used for transporting scrap in a narrow tunnel, and more particularly to a storage battery locomotive equipped with a safety device.

[Prior art]

Generally, a large amount of misalignment occurs in quarrying work in mines, subway construction, sewer construction, and underground power cable laying work. A dolly is used to transport this scrap. This truck is pulled by a towing vehicle and the sludge is transported outside the tunnel. This tow vehicle
Diesel engines have been the main source of power, but in recent years, electric vehicles, that is, storage battery locomotives (from storage battery locomotives, from the perspective of environmental and pollution problems such as the effects of exhaust gas on the health of local residents and workers, and noise mitigation) In general, battery loco,
(Called BL) has been used. Also,
In tunnels for laying power cables or power cables, it is rare to dig large-diameter tunnels these days.
mm-sized tunnels are becoming commonplace. Therefore, as for the Zuritro, the one with a loading capacity of 1.8 m ³ is often used. The storage battery locomotive for towing the Zuritro is a 2t construction locomotive. This conventional storage battery locomotive (BL) 100 for 2t construction currently has a vehicle body length of 2620mm and a vehicle body width of 934mm (this is measured from the protectors provided on both sides of the chassis to the protectors). Is used and its size is standardized. This storage battery locomotive (BL) 100
Has a structure as shown in FIGS. That is, the bearings 102, 10 are provided on the lower outer wall surface of the chassis 101.
3, 104 (not shown) and 105 (not shown) are provided so as to protrude from the outer wall surface. Wheels 107 and 108 fixed by an axle 106 are axially supported by the bearing 102 and the bearing 104. Wheels 110 (not shown) and 111, which are connected and fixed by an axle 109, are axially supported by the bearing 103 and the bearing 105. Further, protectors 112, 113, 114, 115 (not shown) are provided on the front side in the traveling direction to protect the bearings 102, 103, 104, 105 and the axles 106, 109 on both outer wall surfaces of the chassis 101. ing. In addition, the wheels 107, 108, 110 and 111 have motors 116 and 117, respectively.
Is configured to be driven by. This motor 11
By driving 6 and 117, the storage battery locomotive 100 can run forward and backward. A storage battery box 118 is installed on the upper chassis 101 of the motors 116 and 117. The storage battery box 118 has a total length of 1360 mm and a width of 920 mm. This storage battery box
Reference numeral 118 forms a large power storage tank, and supplies electric power to the motors 116 and 117 having a traction force of 630 kg. A storage battery that supplies electric power to the motors 116 and 117 is housed in the storage battery box 118. At the end of this battery box 118,
As shown in the figure, an illumination lamp 119 is attached. In addition, a driver's cab 120 that is operated by a human being is provided in the front of the chassis 101, and a chair 121 is provided. This chair 121 is for a person to sit down and operate the storage battery locomotive 100. A controller 122 that controls the storage battery locomotive 100 is provided near the chair 121. A manual brake handle 123 is provided on the storage battery box 118 side of the chair 121. The manual brake handle 123 is manually operated by a person to stop the storage battery locomotive 100 at a desired position. That is, the conventional storage battery locomotive 100 is stopped by a manual brake in which a person manually turns the manual brake handle 123 to operate the brake. Further, connecting portions 124 and 125 for connecting to the Zuritro are provided at the front and rear of the traveling direction of the chassis 101. Further, rotating lights 126 and 127 are provided on the upper chassis 101 of the connecting portions 124 and 125. The rotating lights 126 and 127 are for rotating a yellow light bulb during work to draw attention. An illumination lamp 128 is attached to the side of the rotating lamp 126.
In addition, an obstruction device 129 for removing large rocks and the like is provided below the chassis 101. Incidentally, reference numeral 130 in the figure is a handrail.

[Problems to be Solved by the Invention]

However, although a tunnel for laying cables for telephone / telephony is sometimes installed in the city, it is sufficient for the maintenance management to be large enough for people to pass through, so it is not possible to excavate a large tunnel. Absent. Therefore, in the conventional 2t class storage battery locomotive, it is not possible to make it larger than the current size, total length 2620mm, and keep the current size (without changing the size) and take safety measures. There must be. However, in the conventional 2t class storage battery locomotive, the storage battery box is large compared to the size of the chassis, and in addition to mounting the storage battery, it is necessary to mount a device for safety measures on the chassis. There is a problem that a space cannot be secured and a device for actually taking safety measures cannot be mounted. Therefore, in the conventional 2t storage battery locomotive, the locomotive may malfunction due to a malfunction even if a person rides on the cab while the locomotive is stopped while the power is on. However, there is a problem in that there is a risk that it may start moving. Furthermore, in the conventional 2t storage battery locomotive, if the speed is gradually increased by driving operation, the speed will increase to the limit of the motor driving force and the safe speed will be exceeded without increasing the speed command value to the maximum. However, in this case, the speed suddenly rises to an unexpected speed, and it takes time to deal with the problem, resulting in a lack of work safety. An object of the first invention of the present application is to prevent a locomotive from moving due to an erroneous operation when a person is not in a 2t storage battery locomotive, and even if the driver increases the speed, the speed is reduced to a safe speed. It is intended to prevent further rise and to ensure safety when driving a locomotive. An object of the second invention of the present application is that in a 2t storage battery locomotive, the locomotive does not start due to an erroneous operation when a person is not in the vehicle, and the speed increases when the driver reaches a safe speed. It is intended to prevent further rises, to secure safety during locomotive driving and to achieve miniaturization.

[Means for solving problems]

In order to achieve the above object, in a 2t storage battery locomotive according to the first invention of the present application, a storage battery that stores a storage battery that supplies electric power to a motor having a traction force of 630 kg of Zuritro in a chassis with a total length of about 2.6 m. A box is placed and a driver's cab is provided adjacent to the battery box, and it is laid in a tunnel of about 2.5 m in diameter by wheels fixed to an axle rotatably supported by bearings mounted on the outer wall of the chassis. In a 2t storage battery locomotive that runs by pulling a Zuritro on a rail, the storage battery box is reduced in size and downsized without changing the power capacity to expand the cab, and a person sits on a chair in the cab. When the dead switch device is provided so that the traveling switch is activated only when the vehicle is operating, a vehicle speed detector that detects the speed of the 2t storage battery locomotive is provided at an appropriate location on the chassis. When the detected vehicle speed exceeds a predetermined upper limit of a predetermined speed, the current supplied to the locomotive driving motor is stopped, and when the detected vehicle speed falls below a predetermined lower limit of a predetermined speed, the locomotive drive is performed. A 2t storage battery locomotive is provided with a speed control device for controlling the locomotive to run within a predetermined speed range by supplying an electric current to a motor for a vehicle. In order to achieve the above-mentioned object, in a 2t storage battery locomotive according to the second invention of the present application, a storage battery that stores a storage battery that supplies power to a motor having a traction force of 630 kg on a chassis with a total length of about 2.6 m. A box is placed and a driver's cab is provided adjacent to the battery box, and it is laid in a tunnel of about 2.5 m in diameter by wheels fixed to an axle rotatably supported by bearings mounted on the outer wall of the chassis. In a 2t storage battery locomotive that runs by pulling a Zuritro on a rail, the storage battery box is reduced in size and downsized without changing the power capacity to expand the cab, and a person sits on a chair in the cab. A deadman device that activates the traveling switch only when the vehicle is operating is installed, and a vehicle speed detector that detects the speed of the 2t storage battery locomotive is installed at an appropriate location on the chassis. When the detected vehicle speed exceeds a predetermined upper limit of a predetermined speed, the current supplied to the locomotive driving motor is stopped, and when the detected vehicle speed falls below a predetermined lower limit of a predetermined speed, the locomotive drive is performed. A speed control device for controlling the 2t storage battery locomotive to run within a predetermined speed range by supplying current to the motor for
The bearing is provided inside the outer wall surface of the chassis, and the protector projecting outside the outer wall surface of the chassis is removed.

[Action]

When a Zlitro is towed by a 2t storage battery locomotive on a rail laid in a tunnel with a diameter of about 2.5m, and a person is not seated in the chair of the cab, the travel switch does not operate, The 2t storage battery locomotive does not run unattended due to malfunction. Also, while the 2t storage battery locomotive is running, the speed of the 2t storage battery locomotive is detected by the vehicle speed detector attached to the chassis, and the speed of the 2t storage battery locomotive is determined based on the detected value, which is a predetermined upper limit. When the speed is exceeded, the supply of electric current to the motor for driving the locomotive is stopped to prevent the speed from further increasing. Also, when the speed of the 2t storage battery locomotive based on the detection value of the vehicle speed detector falls below a predetermined lower limit, the 2t storage battery engine is supplied again to the motor for driving the locomotive. Increase the speed of the car. In this way, the speed of the 2t storage battery locomotive is controlled within the predetermined speed range. In addition, if a 2t storage battery locomotive is used, in which the bearing is installed on the outer wall surface of the chassis and the protector projecting outside the outer wall surface of the chassis is removed, the protector can be removed by the amount of the storage of the bearing on the outer wall surface of the chassis. The minute car width can be reduced.

【Example】

Examples of the present invention will be described below. 1 to 3 show one embodiment of the first invention and the second invention of the present application. In the figure, bearings 3, 4, 5 and 6 are provided inside the lower side wall of the chassis 2 of the storage battery locomotive 1 so as not to project from the outer wall surface. Wheels 8 and 9 fixed by an axle 7 are axially supported by the bearing 3 and the bearing 4. Wheels 11 and 12, which are connected and fixed by an axle 10, are axially supported by the bearing 5 and the bearing 6. The wheel width distance between the wheel 8 and the wheel 9 is larger than the wheel width distance of a conventional storage battery locomotive (BL) by the amount that the bearing 3 and the bearing 4 are mounted inside the outer wall surface so as not to project from the outer wall surface. And it is narrowed. Similarly, the wheel width distance between the wheel 11 and the wheel 12 is determined by the bearing 5
The bearing 6 is narrower than the wheel width of the conventional storage battery locomotive (BL) by the amount that the bearing 6 is mounted inside the outer wall so as not to project from the outer wall. As described above, by providing the bearings 3, 4, 5, 6 so as not to project from the outer wall surface, the bearings 102, 103, 104, 105, and The protectors 112, 113, 114, 115 shown in FIGS. 5 and 6 provided for the purpose of protecting the axles 106, 109 pivotally supported by the bearings 102, 103, 104, 105 can be removed. Therefore, the width of the entire chassis of the conventional storage battery locomotive (BL) for 2t construction can be narrowed by removing the protectors 112, 113, 114, 115 shown in FIGS. 5 and 6, that is, the conventional 2t The width of the chassis of a storage battery locomotive (BL) for construction can be reduced from 934 mm to 830 mm. The wheels 8, 9, 11, 12 are configured to be driven by motors 13, 14 (not shown). By driving the motors 13 and 14, the storage battery locomotive 1 can run forward and backward as indicated by arrow A. A storage battery box 15 is installed substantially in the center of the upper chassis 2 of the motors 13 and 14. This battery box 15 has a total length of 1120 mm and a width.
The length is 920 mm, which is much smaller than the total length of the conventional storage battery box 118 shown in FIG. This battery box 15
Forms a large storage battery tank.
Inside, a badder is provided to supply electric power for driving the motors 13 and 14 having a traction force of 630 kg. Only the storage battery is stored in the storage battery box 15. Further, a driver's cab 16 is provided on one side adjacent to the storage battery box 15 in the longitudinal direction of the chassis 2, and a device stand 17 is provided on the other side. A device box 80 is placed on the device stand 17. This equipment stand 17
The storage battery box 15 can be provided on the chassis 2 by forming the storage battery box 15 smaller than the conventional storage battery box 118. Further, as shown in FIG. 1, an illumination lamp (headlight) 18 is attached to the tip of the chassis 2 on the device stand 17 side. This storage lamp (headlight) 18 is a storage lamp locomotive 1 lighting headlight.
When traveling in the direction of 18, the interior of the gallery in the traveling direction of the storage battery locomotive 1 is illuminated. Further, connecting rods 19 and 20 for connecting with the Zuritro are provided in front of and behind the traveling direction of the chassis 2. In addition, at both ends in the longitudinal direction of the upper chassis 2 of the connecting rods 19 and 20, the rotary lamp 2
1, 22 are provided. These revolving lights 21 and 22 are for rotating a yellow light bulb during work to call attention. An illumination lamp (backlight) 23 is attached to the rotating light 21 side. When the storage battery locomotive 1 travels in the direction of the lighting (rearlight) 23, the illumination light (rearlight) 23 illuminates the inside of the gallery in the traveling direction of the storage battery locomotive 1. Further, at the lower part of the chassis 2, an obstacle stopper 24 for removing large rocks or the like is provided. Further, a fixed position automatic stop device 30 is provided below the device stand 17 of the chassis 2. The fixed position automatic stop device 30 detects the magnetic force of a magnet installed at a predetermined position on the rail side to automatically operate the brake. The fixed position automatic stop device 30 may be one that sets an oscillator at a predetermined position on the rail side, catches a radio wave of a predetermined frequency emitted from the oscillator, and operates a brake. A driver's cab 16 of the chassis 2 is where a person rides to operate the storage battery locomotive 1. The driver's cab 16 has a chair 25
Is provided. A handrail 26 is provided at the end of the rear chassis 2 of the chair 25. The handrail 26 is for preventing the driver from accidentally falling. A traveling direction indicator lamp 32 is provided at a substantially central portion of the handrail 26. The traveling direction indicator light 32 is for indicating the traveling direction of the storage battery locomotive 1, and is adapted to blink when the storage battery locomotive 1 proceeds with the traveling direction indicator light 32 at the head. The chair 25 is used when a person sits down and operates the storage battery locomotive 1, and a controller 27 that controls the speed of the storage battery locomotive 1 is provided near the chair 25. Has been. The speed change lever 28 and the forward / reverse change switch 29 provided on the upper part of the controller 27 are for speed control. This controller
A speed control device 40 is provided near 27. The speed control device 40 includes wheels 8, 9, 11 of the storage battery locomotive 1,
It has a function of detecting 12 wheel speeds and keeping them constant so that the speed does not increase any more when a predetermined speed is reached. That is, when the speed control device 40 reaches a predetermined upper limit of a predetermined speed, the drive current to the motor for driving the wheels of the storage battery locomotive 1 is stopped (speed acceleration is stopped), and the motor is driven. When the speed of the storage battery locomotive 1 decreases due to the stop of the electric current to reach a predetermined lower limit of a predetermined speed, the supply of the drive current to the motor that drives the wheels of the storage battery locomotive 1 is started again. The speed control device 40 is provided with an alarm device (not shown). When the vehicle speed of the storage battery locomotive 1 reaches a predetermined speed, this alarm device keeps a certain time (for example, 5 seconds or 10 seconds).
Seconds) to issue an alarm. A vehicle speed sensor (not shown) is used to detect the vehicle speed. The vehicle speed sensor includes one that is immediately attached to the transmission (the axle if there is no transmission) and one that is detected by bringing a cable from the transmission (or the axle) into the panel meter in the driver's seat. The former is a rotating plate that has, for example, 30 protrusions provided on the shaft,
By the rotation of the rotary plate, 30 pulses per rotation are output by a pulse generator constituted by a magnet at a position facing the protrusion and an amplifier connected to the pulse generator. In the latter, a switch is provided at a position facing the magnetic protrusion by the rotation of the disk with the magnetic protrusion, and a pulse signal is output to the voltage applied via the resistor due to the intermittent operation of the switch. For example, eight pulses of this pulse signal are output for one rotation. The output pulse signal has a constant relationship (linear change) between the vehicle speed and the frequency. Since the frequency changes greatly with respect to the vehicle speed, the vehicle speed can be detected from the frequency. Becomes Further, an electric brake switch 61 of the power braking device 60 is attached to the vehicle speed control device 40. A deadman device 50 is provided below the chair 25. This deadman device 50 is a switch that turns on when a person sits in the chair 25, and the storage battery 15 is attached to this switch.
The power supplied from is connected. Ie chair
25 is constantly pressed upward by a spring (not shown), and when a person sits on this chair 25, the chair 25
Slides downwards. When this chair 25 slides down,
A switch provided on the chair 25 is configured to come into contact with a contact (not shown) provided on the chassis to perform switching. By this switching, the storage battery locomotive 1 can be driven for the first time. Therefore, the storage battery locomotive 1 cannot operate unless a person sits down on the chair 25. Also, on the storage battery 15 side of the chair 25, a manual brake handle
31 is provided. This manual brake handle 31
This is for a human to manually operate the storage battery locomotive 1 at a desired position.
It can be operated separately from. A device box 80 is mounted on the device stand 17 of the chassis 2. A power braking device 60 is provided in the device box 80. The power braking device 60 includes a compressor motor 62, a compressor 63, an air cylinder 64, a reservoir tank 70, and an electric brake switch 61 mounted on a speed control device 40, which are housed in a device box 80.
It is composed of and. That is, when the electric brake switch 61 is turned on, the reservoir tank 70 is opened, compressed air is supplied to the air cylinder 64, and the air cylinder 64 is operated. When the air cylinder 64 operates, the brake attached to the tip of the air cylinder 64 causes the wheels 8,
Pressing 9, 11 and 12, the brake works. Further, when the pressure in the receiver tank 70 falls below a predetermined pressure, the electric compressor motor 62 operates to operate the compressor 63 to supply air into the receiver tank 70, and the air pressure in the receiver tank 70 is always kept at a predetermined level. There is more than pressure. When the air cylinder 64 operates in this manner, a brake load is applied to the wheels 8, 9, 11, 12 and the storage battery locomotive 1 is stopped. Further, a rear light 33 is mounted in the device box 80 so that the traveling direction of the storage battery locomotive 1 can be known. Further, the lower corner of the chassis 2 is not angular unlike the conventional storage battery locomotive and is chamfered. Therefore, in the case of a tunnel such as a tunnel where the lower part is dug round, it is possible to prevent the lower corners of the chassis 2 from colliding with each other when the line is changed or when the line is changed to Zuritro. The traveling direction indicator light 32,
33 is configured to switch in conjunction with the forward / reverse selector switch 29, and when the forward / reverse selector switch 29 is switched forward, the traveling direction indicator lamp 33 is turned on and the forward / reverse selector switch 29 is switched to reverse. Then, the traveling direction indicator lamp 32 is configured to light up. Since it is configured in this way, the storage battery locomotive 1
When the vehicle travels in the direction shown by arrow B in FIG. 1, the rotating lamp 22 and the lighting lamp 18 are turned on, and when traveling in the direction shown by the arrow C, the rotating lamp 21 and the lighting lamp 23 are turned on. In the storage battery locomotive 1, when a person sits down on the chair 25 of the cab 16 and turns on the switch, the motors 13 and 14 operate. Controller 27
When the speed change lever 28 and the forward / reverse change switch 29 are operated, the storage battery locomotive 1 starts running. When the storage battery locomotive 1 starts traveling, the vehicle speed sensor detects the vehicle speed (wheel speed), and when the vehicle reaches a certain speed (speed determined as a safe speed), the speed control device 40 operates so that the vehicle speed becomes constant. To control the motors 13 and 14. When it is necessary to stop during running, the power brake device 60 is activated by turning on the electric brake switch 61, and the storage battery locomotive 1 is stopped by power. Also, when the target position is reached, the fixed position automatic stop device 30 detects the stop position, and automatically activates the brake to stop the storage battery locomotive 1 at the fixed position.

【The invention's effect】

As described above, according to the first invention of the present application, the total length is 2.
Mounted on the outer wall of the chassis is a storage battery box that houses a storage battery that supplies electric power to a motor that has a traction force of 630 kg for a 630 kg vehicle, and a driver's cab adjacent to the battery box. The storage capacity of the storage battery box of a 2t storage battery locomotive that runs by pulling the Zuritro on a rail laid in a tunnel with a diameter of about 2.5m is fixed by wheels fixed to an axle that is rotatably supported by bearings. The exterior of the driver is reduced to a smaller size to expand the driver's cab, and a deadman device is installed so that the traveling switch operates only when a person is seated on the chair of the driver's cab. A vehicle speed detector for detecting the speed of the vehicle is provided, and when the vehicle speed detected by the vehicle speed detector exceeds a predetermined upper limit of a predetermined speed, it is supplied to a motor for driving the locomotive. A speed control device that controls the locomotive of a 2t storage battery locomotive to run within a predetermined speed range by supplying a current to a motor for driving the locomotive when the flow is stopped and the speed falls below a predetermined lower limit of a predetermined speed Since the 2t storage battery locomotive is provided, the locomotive does not move due to an erroneous operation when a person is not riding on the 2t storage battery locomotive, and even if the driver speeds up, the speed increases further when it reaches a safe speed You can avoid doing that. Further, according to the second invention of the present application, a chassis with a total length of about 2.6 m is provided.
A storage battery box that stores a storage battery that supplies electric power to a motor having a traction force of 630 kg is mounted, and a driver's cab is provided adjacent to the storage battery box, and is freely rotatable on a bearing mounted on the outer wall surface of the chassis. The outer diameter of the storage battery box of a 2t storage battery locomotive that runs by pulling the Zuritro on a rail laid in a tunnel with a diameter of about 2.5m is reduced by the axle fixed to the supported axle without changing the power capacity. The size of the driver's cab is expanded to a smaller size, and a deadman device that activates the travel switch only when a person is seated on the cab is installed to detect the speed of a 2t storage battery locomotive at an appropriate location on the chassis. A vehicle speed detector is provided, and when the vehicle speed detected by this vehicle speed detector exceeds a predetermined upper limit of a predetermined speed, the current supplied to the motor for driving the locomotive is stopped, A speed control device is provided to control the 2t storage battery locomotive to run within a predetermined speed range by supplying current to the motor for driving the locomotive when the speed falls below a predetermined lower limit of a predetermined speed. It is a 2t storage battery locomotive because it is constructed by removing the protector provided inside the outer wall surface of the chassis and protruding outside the outer wall surface of the chassis, and the locomotive starts to move by mistake when a person is not riding Even if the driver increases the speed, it is possible to prevent the speed from further increasing when the safe speed is reached, and it is possible to reduce the size.

[Brief description of drawings]

FIG. 1 is a front view of a storage battery locomotive according to the present invention, FIG. 2 is a plan view of the storage battery locomotive shown in FIG. 1, FIG. 3 is a left side view of the storage battery locomotive shown in FIG. 1, and FIG. A front view of a conventional storage battery locomotive, FIG. 5 is a plan view of a storage battery locomotive shown in FIG. 4,
FIG. 6 is a left side view of the storage battery locomotive shown in FIG. 1 …… Storage battery locomotive 2 …… Chassis 16 …… Driver stand 17 …… Equipment stand 25 …… Chair 30 …… Fixed position automatic stop device 40 …… Speed control device 50 …… Deadman device 60 …… Power brake device 80 …… Storage battery box

Claims (2)

[Claims] 1. A storage battery box for accommodating a storage battery for supplying electric power to a motor having a traction force of 630 kg is mounted on a chassis having a total length of about 2.6 mm, and a driver's cab is provided adjacent to the storage battery box, In a 2t storage battery locomotive that runs by pulling Zlitro on a rail laid in a tunnel with a diameter of around 2.5m by wheels fixed to an axle that is rotatably supported by bearings mounted on the outer wall of the chassis, The battery box is reduced in size without changing the power capacity to make it smaller and the driver's cab is expanded, and the driver's cab is equipped with a deadman device that operates the traveling switch only when a person is seated on the chair. , A vehicle speed detector that detects the speed of a 2t storage battery locomotive is provided at an appropriate location on the chassis, and the vehicle speed detected by the vehicle speed detector exceeds a predetermined upper limit of a predetermined speed. Stop the current supplied to the locomotive driving motor, and supply a current to the locomotive driving motor when the locomotive driving motor drops below the predetermined lower limit of the predetermined speed. A 2t storage battery locomotive characterized by being provided with a speed control device for controlling the vehicle to travel within a speed range. 2. A storage battery box for storing a storage battery for supplying electric power to a motor having a pulling force of 630 kg is mounted on a chassis having a total length of about 2.6 m, and a cab is provided adjacent to the storage battery box, In a 2t storage battery locomotive that runs by pulling Zlitro on a rail laid in a tunnel with a diameter of around 2.5m by wheels fixed to an axle that is rotatably supported by bearings mounted on the outer wall of the chassis, The battery box is reduced in size without changing the power capacity to make it smaller and the driver's cab is expanded, and the driver's cab is equipped with a deadman device that operates the traveling switch only when a person is seated on the chair. , A vehicle speed detector that detects the speed of a 2t storage battery locomotive is provided at an appropriate location on the chassis, and the vehicle speed detected by the vehicle speed detector exceeds a predetermined upper limit of a predetermined speed. Sometimes the current supplied to the locomotive driving motor is stopped, and when it drops below the predetermined lower limit of the predetermined speed, the electric current is supplied to the locomotive driving motor to drive the 2t storage battery locomotive at the predetermined speed. A 2t characterized in that a speed control device for controlling the vehicle to travel within the range is provided, the above-mentioned bearing is provided inside the outer wall surface of the chassis, and the protector protruding outside the outer wall surface of the chassis is removed. Storage battery locomotive.