JP2006027522A - Container carrier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container carrier capable of improving a follow-up property of a driving wheel in driving the container carrier into a road surface with dents in a container yard. <P>SOLUTION: This container carrier on which a plurality of wheels are arranged on a front part of lower frames 53L, 53R on left and right side parts of a vehicle and a single wheel is arranged on a rear part of them and each of shafts 65 supporting each of the wheels free to horizontally turn is furnished through the lower part frames in the vertical direction travels on the road surface with the dents in the container yard with either one of the left and right wheels made as a driving wheel driven by an electric motor 62, wherein an upper part of each of the axles 65 to support the left and right driving wheels 56L, 56R is made as a hydraulic cylinder 26, an accumulator 32 is connected to an oil chamber 27d of the hydraulic cylinder and the left and right driving wheels are made to independently follow the road surface with the dents. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a container carrier that travels in a container yard, and more particularly to an improvement in the suspension of the container carrier.

  Conventionally, a container carrier (straddle carrier) 50 for transporting a container (such as a marine container) in a container yard such as a harbor is, for example, a vehicle 51 having a portal structure as shown in FIG. Here, when the container carrier 50 travels in the forward P direction, the front portion refers to the front position on the opposite side of the driver's cab, where the cab 52 is located at the rear of the vehicle 51. Among them, a pair of left and right left members is denoted by L, and a right member is denoted by R.

  The vehicle 51 has a lower frame 53L on the left side and a lower frame 53R on the right side in the forward P direction, and each lower frame is formed of a box beam and extends in the front-rear direction of the vehicle 51. For example, the first wheels 54L and 54R, the second wheels 55L and 55R, and the third wheels 56L and 56R are arranged as a single rear wheel in the lower part of the left and right lower frames 53L and 53R. The fourth wheels 57L and 57R are arranged away from the rear side of the wheels. These wheels can be steered in the left-right direction, and the third wheels 56L and 56R are, for example, driving wheels and the other wheels are driven wheels. An engine 58 is mounted on the upper surface of the lower frame 53L on the left side and a generator 59 is mounted on the front side of the lower frame 53L. An inverter 60 is mounted on the upper surface of the lower frame 53R on the right side. It is equipped with. Furthermore, electric motors 62 that rotate and drive the third wheels 56L and 56R are respectively provided on the left and right sides of the vehicle 51 at the upper part of the axles of the third wheels. The left and right electric motors 62 are connected to the third wheels 56L and 56L via the power transmission mechanism 63, respectively. 56R is driven.

  Such a suspension 64 of the container carrier 50 includes each wheel from the first wheel 54L, 54R to the fourth wheel 57L, 57R arranged in the lower part of the left and right lower frames 53L, 53R, and each wheel that supports each wheel. It is comprised from the axle 65 and each rubber 66 etc. which are provided in the upper part of each axle. The power transmission mechanism 63 that transmits the driving force to the third wheels 56L and 56R is separated from the axle 65 and offset to the inside of the vehicle, and the arrangement and suspension of each wheel on the lower frame are the same for each wheel. It is a configuration. Accordingly, only the left first wheel 54L will be described below for the suspension, and the description of the other wheels will be omitted.

  As shown in FIG. 6, the upper portion of the axle 65 that supports the first wheel 54 </ b> L so as to be horizontally turnable penetrates in the vertical direction of the lower frame 53 </ b> L. That is, the axle 65 is composed of a fork shaft 65a and a fork 65b that supports the fork shaft, and a lower end portion of the fork shaft 65a is fastened to the fork 65b with a bolt. Therefore, when the first wheel 54L is steered, the axle 65 rotates together with the first wheel. A first wheel 54L is suspended from the fork 65b via a wheel hub 67, a brake device 68, a spindle 69, and the like.

  The fork shaft 65a is provided so as to be vertically movable and rotatable via an upper bush 70 at the upper part and a lower bush 71 at the lower part, and supports the lower frame 53L. Specifically, the upper bush 70 is formed with a flange portion 70a at the upper end thereof, and the flange portion 70a is fastened to a distance piece 72 fixed to the upper surface of the lower frame 53L by a bolt and a flange portion 73a of a shaft end cover 73 described later. ing. The lower bush 71 has a flange portion 71a formed in the lower portion, and the flange portion 71a is fastened to a flange portion 74a of a cylindrical member 74 that is fixed by penetrating the lower frame 53L in the vertical direction with bolts. The shaft end cover 73 has a cylindrical shape with the upper surface sealed and the lower surface opened, and a flange portion 73a is formed at the lower end portion. The support member 76 of the lower ring 75a of the thrust bearing 75 is fastened to the upper end portion of the fork shaft 65a with a bolt, and the pressing member 77 of the upper ring 75b of the thrust bearing 75 is moved up and down on the side inner peripheral surface of the shaft end cover 73. Inserted as possible. Further, a rubber 66 for reducing the impact from the first wheel 54 </ b> L is provided in the space between the upper surface of the pressing member 77 and the inner upper surface 73 b of the shaft end cover 73. A fork arm 79 for connecting a link mechanism 78 of a steering device to be described later via a connecting pin 79a is fastened to the upper end of the fork 65b together with the lower end of the fork shaft 65a by a bolt.

In addition to such a container carrier 50, an electric motor that rotates the driving wheel, a generator that supplies electric power to the electric motor, and an engine that drives the electric generator are provided in the vehicle body, and the electric motor is the driving wheel. A container carrier equipped with a rubber suspension for mitigating impact from the drive wheel is known, which is provided above and is provided with a drive transmission mechanism that connects the motor and the drive wheel to transmit the driving force of the motor to the drive wheel. It has been. (For example, refer to Patent Document 1).
JP-A-8-163708 (paragraph numbers 0007 and 0015 and FIG. 1)

  However, the rubber 66 (FIG. 6) provided at the upper end of the axle 65 is made of hard rubber having a high hardness and a spring constant that is 1.5 to 2 times that of the wheels (tires). Therefore, the third carrier 56L, 56R, which is the driving wheel, has a depression while the container carrier 50 at the maximum loading is forward and backward (arrows P and Q) as shown in FIG. When entering the road surface (concave road surface) G2, the left and right third wheels 56L and 56R may stop in a state of floating from the road surface.

  That is, the suspension rubber 66 (FIG. 6) is compressed and elastically deformed by the loaded wheel load and reaches its maximum value when it reaches the maximum loading state from the unloaded free length state. When the third wheels 56L and 56R enter the road surface G2 having a deep depression greater than the maximum deflection, the rubber extends from the compressed state to the free length and does not extend any further, and there is no force to press the road surface. Accordingly, the wheels cannot follow the road surface G2 having the depression, and the wheels are idled without being brought into contact with the ground, and the driving force is not generated, so that the container carrier 50 is stopped. Further, it is conceivable to reduce the rubber spring constant and reduce the hardness so that the wheel follows the road surface G2 having the depression, but the durability of the rubber is lowered.

  The wheel load per wheel when the container carrier 50 lifts, for example, a 40-foot container, which is the maximum loading capacity, and travels on a flat road surface without unevenness at a speed of 20 km / h is 12 as an evenly distributed load. 000 kg (total weight 96,000 kg), and if the rubber spring constant is 225 kgf / mm, the maximum deflection is about 53 mm.

  In view of the above-described conventional problems, an object of the present invention is to provide a container carrier that can improve the followability of a drive wheel when the container carrier enters a road surface having a depression in a container yard.

  The invention according to claim 1 is provided with a lower frame on the left and right sides of the vehicle, and a plurality of wheels are arranged at the front part of each lower frame, and a single wheel is arranged at the rear part away from the wheels, Each axle that supports each wheel in a horizontally swingable manner is provided through each lower frame in the vertical direction, and one of the front and rear wheels is a drive wheel driven by an electric motor. In the container carrier traveling on the road surface having the depression in the container yard, the upper part of each axle supporting the left and right drive wheels is a hydraulic cylinder, an accumulator is connected to the oil chamber of the hydraulic cylinder, and the left and right drive wheels Is capable of following the road surface independently of each other.

  In this way, since the hydraulic oil accumulated by the accumulator is circulating in the oil chamber of the hydraulic cylinder at the top of each axle, when the drive wheel of the container carrier enters the road surface having a depression, the hydraulic cylinder As the piston is pushed downward, the axle and the drive wheel descend, and the drive wheel follows the road surface and contacts the ground. Therefore, the driving wheel is driven by the electric motor without idling, and the container carrier can travel on the road surface having the depression.

  According to a second aspect of the present invention, a recess is formed in a lower portion of a piston built in each hydraulic cylinder, and a bearing member that prevents the piston and the axle from rotating together is provided in the recess, and the bearing member Preferably, the lower ring support member is connected to the upper end portion of the axle so that the upper ring pressing member of the bearing member is in close contact with the upper surface of the recess.

  In this way, even if the lower ring of the bearing member and the support member rotate integrally with the axle, the upper ring of the bearing member and the pressing member thereof are integrated with the piston without rotating together with the axle. Keep. That is, even if the axle rotates, the piston does not rotate and does not rotate together. Moreover, the bearing member for preventing co-rotation with a piston and an axle can be provided using the recessed part formed in the piston lower part.

  As described in claim 3, the first wheel and the second wheel as well as the third wheel at the front part of each lower frame, and the fourth wheel at the rear part away from the third wheel, respectively, The third wheel is preferably a driving wheel.

  In this way, since the third wheel is positioned substantially at the center in the front-rear direction of the container carrier, the third wheel has the smallest rudder angle to turn horizontally compared to the other wheels when the container carrier turns in the left-right direction. . Therefore, the horizontal rotation angle of the axle that supports the third wheel, which is the drive wheel, is also the smallest compared to other axles, so that the durability of the hydraulic cylinder that is the suspension at the upper part of the axle is enhanced.

In the present invention, the upper part of each axle that supports the left and right drive wheels of the container carrier is a hydraulic cylinder, and an accumulator is connected to the oil chamber of the hydraulic cylinder.
(1) When the drive wheel of the container carrier gets into the road surface in the container yard with the depression, the drive wheel independently follows the road surface and touches down.
(2) The driving wheel is driven by the electric motor without idling, and the container carrier can travel on a road surface having a depression.
(3) Therefore, the operation efficiency of the container carrier can be increased.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Here, in the configuration shown in FIGS. 1 to 4, the same components as those in FIGS.

  FIG. 1 is a left side view of a container carrier 1 according to an embodiment of the present invention, FIG. 2 is an AA direction arrow view of FIG. 1 and shows an example of a steering state of each wheel, and a link mechanism is indicated by a two-dot chain line. ing. FIG. 3 shows a suspension including a partial cross-section as viewed in the direction of arrows BB in FIG.

  As shown in FIG. 1, the container carrier 1 includes a vehicle 51 having a portal structure similar to the conventional one. That is, the vehicle 51 has a front portal body 2 formed by a pair of left and right vertical frames 2a and a cross member 2b that connects the left and right vertical frames at the upper end on the upper surface of the left and right lower frames 53L and 53R, A central gate-type body 3 formed in the same manner as the front portal-type body is provided in the part, and a pair of left and right rear vertical frames 4 lower than the vertical frame 2a are provided in the rear part. Between the front portal body 2 and the central portal body 3, a pair of left and right upper members 5 and lower members 6, a pair of left and right upper tension members 7 and lower tension members 8 provided in a crossing manner, and the like. Are connected to form a portal structure. A substantially U-shaped rear projecting member 9 is connected to the upper ends of the pair of left and right rear vertical frames 4 in a plan view, and the cab 52 is eccentrically fixed to the right side on the upper surface thereof. A handrail member 10 is attached. As a ladder for raising and lowering the driver's cab, the first ladder 11 is vertically arranged along the left side portion of the central portal body 3, and a hand is provided between the upper end portion of the first ladder and the front end portion of the handrail member 10. A second ladder 12 with sliding is provided. Furthermore, a spreader 13 that lifts the container K so that it can be raised and lowered is provided in the inner space of the front portal body 2 and the central portal body 3, and the container K indicated by the alternate long and short dash line has a 40-foot container 3 above the ground. A state in which the fourth-stage container K is lifted by the spreader 13 is shown.

  Next, a steering angle is given to the front wheels from the first wheels 54L, 54R to the third wheels 56L, 56R and the rear wheels, which are the fourth wheels 57L, 57R, arranged in the left and right lower frames 53L, 53R. The configuration of the steering device 14 will be described. As shown in FIG. 2, the steering device 14 includes a fork arm 79 fixed to each fork 65b (FIG. 3), a link mechanism 78 for connecting each fork arm, and a substantially central portion of the left and right lower frames 53L and 53R. The left and right center arms 15L and 15R connected to the link mechanism 78, the left and right steering cylinders (hydraulic cylinders) 16 and 17 for steering the front wheels and the rear wheels, and the like.

  The link mechanism 78 has link mechanisms 78L and 78R on the left and right, and a first link rod 18L that connects the fork arms 79 provided on one side of the first wheels 54L and 54R and the second wheels 55L and 55R, 18R, the second link rods 19L, 19R connecting the fork arms 79a provided on the other side of the second wheels 55L, 55R and the center arms 15L, 15R, and the fork arms 79 of the third wheels 56L, 56R. And third link rods 20L, 20R that connect the center arms 15L, 15R, and fourth link rods 21L, 21R that connect the center arms 15L, 15R and the fork arms 79 of the fourth wheels 57L, 57R. is doing. The center arms 15L and 15R are flat plates formed so that one end portions of the above-described second to fourth link rods and the rod side end portions 16a and 17a of the left and right steering cylinders can be connected to each other. 22L and 22R are attached, and are provided on the lower surfaces of the lower frames 53L and 53R so as to be horizontally rotatable through appropriate brackets.

  The left and right steering cylinders have head side end portions 16b and 17b attached to the lower surfaces of the lower frames 53L and 53R through appropriate brackets so as to be rotatable, and the rod side end portions 16a and 17a are rotatable to the center arms 15L and 15R described above. Installed on.

  According to the steering device 14 configured as described above, the steering valve (not shown) is operated by rotating the handle 23 (FIG. 1) provided in the driver's cab 52 to the left or right, and the left and right steering cylinders are operated. 16 or 17, the pressure oil flows, the steering cylinder expands and contracts, and the front wheels from the first wheels 54L and 54R to the third wheels 56L and 56R and the rear wheels that are the fourth wheels 57L and 57R. A steering angle in the left-right direction is given, and steering can be performed by a front-rear reverse phase in which the front wheels and the rear wheels change directions in opposite directions.

  Therefore, since the third wheels 56L and 56R that are drive wheels are positioned substantially at the center in the front-rear direction (longitudinal direction) of the container carrier 1, the left wheel that is the third wheel when the container carrier turns in the left-right direction. The steering angle α of 56L and the steering angle β of the right wheel 56R are the smallest compared to the other wheels. FIG. 2 shows the steering state of each wheel when the handle 23 is rotated to the left during traveling in the forward direction P. When the steering wheel 23 is rotated to the right, each wheel is in the state shown in FIG. This is the opposite direction.

  As shown in FIG. 1, the suspension 24 of the container carrier 1 configured as described above is the first wheel 54L, 54R, the second wheel 55L, 55R and the driven wheel of the fourth wheel 57L, 57R as shown in FIG. The conventional suspension 64 provided with a rubber 66 on the upper part of the axle described in the above, and the driving wheels of the third wheels 56L and 56R are suspensions 25 in which the upper part of the axle is a hydraulic cylinder.

  Next, the suspension 25 of these drive wheels will be described with reference to FIG. Here, in the suspension 25 shown in FIG. 3, the configuration of the lower part from the upper bush 70 is the same as that of the conventional suspension 64 described in FIG. 6, so that the description thereof is omitted and further described in FIG. 5. The power transmission mechanism 63 and a speed reducer (not shown) are also omitted. The main part of the suspension 25 is that the upper part of the axle 65 is a hydraulic cylinder 26. The hydraulic cylinder 26 includes a cylinder main body 27, a piston 28 built in the cylinder main body, a bearing member 29 provided in a recess 28a in a lower portion of the piston, and a pressing member 30 provided vertically so as to sandwich the bearing member. It is comprised from the support member 31 grade | etc.,.

  The cylinder body 27 has a cylindrical shape with the upper surface sealed and the lower surface opened, and a flange portion 27a is formed at the lower end portion. An accumulator 32 is connected to the upper surface 27b, and an oiling plug 33 is provided. The accumulator 32 includes an oil chamber 32a and a gas chamber 32b in which a compressible gas (nitrogen gas) is sealed in an elastic body (rubber) bag. Further, the inner side surface 27c of the cylinder body allows the piston 28 to slide up and down. The piston has a recess 28a in the lower part, and a ring 34 for preventing oil leakage from the skirt part. A thrust bearing 29, which is a bearing member that prevents the piston 28 and the axle 65 from rotating together, is provided in the piston recess 28a.

  Specifically, the support member 31 that supports the lower ring 29a of the thrust bearing 29 has a convex portion 31a formed at the center of the upper surface, and the lower ring 29a is press-fitted into the outer peripheral surface thereof, so that the upper end surface of the fork shaft 65a that is an axle. And fastened with bolts. Further, the pressing member 30 that presses the upper ring 29b of the thrust bearing has a convex portion 30a formed at the center of the lower surface, and the center ring 35 for positioning the pressing member 30 by press-fitting the upper ring 29b on the outer peripheral surface thereof. It is implanted in the support member 31 on the other side. In other words, even if the support member 31 and the fork shaft 65a rotate integrally, the support member 31 is such that axial force (tensile force) does not act on the center bolt 35 in order to prevent co-rotation with the pressing member 30. To plant. Therefore, the holding member 30 is provided with a through hole 30b having a diameter larger than the bolt diameter of the center bolt 35 and a recess 30c into which the bolt head of the center bolt sinks, and a washer 36 on the bottom surface 30d of the recess. And a gap Y is appropriately provided between the upper surface of the washer 36 and the seat surface 35a of the bolt head so that no tensile force acts on the center bolt 35. The pressing member 30 has an upper surface 30e whose outer surface can contact the upper surface 28b of the concave portion of the piston.

  Next, the thrust bearing 29 and the pressing member 30 assembled in this way are inserted into the recess 28a of the piston. In this case, it inserts until the upper surface 30e of a pressing member contacts the upper surface 28b of the recessed part of a piston. Subsequently, the piston 28 is press-fitted into the inner side surface 27c of the cylinder body, and the hydraulic cylinder 26 is assembled by fastening the flange portion 27a of the cylinder body together with the flange portion 70a of the upper bush 70 to the upper surface of the distance piece 72 with a bolt. .

  Subsequently, in order to operate the hydraulic cylinder 26, the upper oil chamber 27d of the cylinder body is filled with hydraulic oil. After filling, the axle 65 is adjusted so as to be movable in the vertical direction while pressurizing the hydraulic oil by applying pressure from the accumulator 32 and a required load, and the piston stroke S at the maximum loading is set. That is, when the container carrier 1 is stationary on a flat road surface (G1 in FIG. 4), the stroke S lifts the 40-foot container K (FIG. 1) that is the maximum load capacity, and the third wheel 56L or 56R that is the driving wheel. The wheel load is applied to the hydraulic cylinder 26, and the piston position at that time is set to the neutral position NN, and the stroke S1 is set on the ascending side of the piston and the stroke S2 is set on the descending side with the neutral position as the origin. Note that S2 is ensured to be larger than the maximum deflection amount of the rubber 66 of the conventional suspension 64 described in FIG. Accordingly, the axle 65 that is in contact with the piston 28 via the thrust bearing 29 or the like can move up and down within the strokes S1 and S2. In the present embodiment, for example, the stroke S is 140 mm and the piston diameter D is 200 mm.

  Further, the upper surface 30 e of the pressing member 30 can be in close contact with the upper surface 28 b of the concave portion of the piston by the pressure of the hydraulic oil loaded on the piston 28 and the push-up load from the axle 65. Furthermore, since the outer peripheral surface of the convex portion 30a of the pressing member is press-fitted into the upper ring 29b of the thrust bearing, the piston 28, the pressing member 30, and the upper ring 29b are integrated. Therefore, even if the support member 31 integrally connected to the axle 65 and the lower ring 29a of the thrust bearing rotate, the piston 28 and the pressing member 30 do not rotate together. Therefore, the joint rotation of the piston 28 and the axle 65 can be prevented.

  Next, when the container carrier 1 having the suspension 25 configured as described above enters the road surface having a depression in the container yard when the container carrier 1 is fully loaded, the followability of the third wheel that is the drive wheel is shown in FIGS. 4 will be described. FIG. 4 (a) is an explanatory diagram of the state of the suspension of the container carrier when it is stationary on a flat road surface, and FIG. 4 (b) is an explanatory diagram showing the followability of the wheel when the third wheel enters the road surface having a depression. ing.

  First, as shown in FIG. 4, the container carrier 1 has a first wheel 54L, 54R and a second wheel 55L, 55R in front of the lower part of the lower frame 53L, 53R, and a third wheel 56L, 56R and a rear wheel. The four wheels 57L and 57R are arranged, and these suspensions 24 are suspensions 64 by rubber 66 for the first and second wheels and the driven wheels of the fourth wheel, and the driving wheels of the third wheel are hydraulic cylinders. 26 is constituted by a suspension 25. Therefore, when stationary on the flat road surface G1 shown in FIG. 4A, the piston 28 of the hydraulic cylinder 26 of the third wheel is pressured by the pressure (reaction force) from the gas chamber 32b of the accumulator 32 shown in FIG. The pressurized oil flows from the oil chamber 32a to the upper oil chamber 27d of the hydraulic cylinder 26 (cylinder main body 27), and the upper surface of the piston 28 is pressurized and pushed downward to maintain the neutral position N-N. The third wheels 56L and 56R and other driven wheels are kept in a grounded state.

  In this state, when the container carrier 1 moves back and forth (arrows P and Q) and the third wheels 56L and 56R enter the road surface G2 having a depression as shown in FIG. 4B, the piston shown in FIG. 28 is pushed downward from the neutral position NN by the pressure oil from the accumulator 32 as described above, and the third wheels 56L and 56R are sequentially lowered in the range of the stroke S2 integrally with each axle 65, Grounding is performed while continuously following the road surface G2 having a depression from the flat road surface G1. Accordingly, the third wheels 56L and 56R are driven by the electric motor 62 (FIG. 1) without idling, and the container carrier 1 can travel on the road surface G2 having a depression. Even if only one of the left wheel 56L and the right wheel 56R of the third wheel enters the road surface G2 having a depression, it can follow and ground independently.

  Further, as described with reference to FIG. 2, the third wheels 56 </ b> L and 56 </ b> R, which are drive wheels, are positioned substantially at the center in the front-rear direction of the container carrier 1. The steering angle α of 56L and the steering angle β of the right wheel 56R are the smallest compared to the other wheels. At the same time, the horizontal rotation angle of each axle 65 supporting the third wheels 56L and 56R, which are drive wheels, is also the smallest compared to other axles. Therefore, wear of the thrust bearing 29, the pressing member 30, and the support member 31 of the hydraulic cylinder 26 that is the suspension 25 at the upper part of the axle shown in FIG. 3 is reduced, and the durability of the hydraulic cylinder 26 can be improved.

  In addition to the above, in the container carrier according to the embodiment of the present invention, the third wheel is the driving wheel, but wheels other than the third wheel may be the driving wheel.

The left side view of the container carrier which concerns on implementation of this invention is shown. An example of the steering state of each wheel is shown in the AA arrow view of FIG. 3 (a) shows a suspension including a partial cross-section as viewed in the direction of the arrow B-B in FIG. 1, FIG. 3 (b) is an enlarged view of a portion D1 in FIG. 3 (a), and FIG. The D2 part enlarged view of 3 (b) is shown. FIG. 4 (a) is an explanatory diagram of the suspension state when the container carrier is stationary on a flat road surface, and FIG. 4 (b) is an explanatory diagram showing the followability of the wheel when the third wheel enters the road surface having a depression. . Fig.5 (a) is a left side view of the conventional container carrier, FIG.5 (b) shows the EE direction arrow line view of Fig.5 (a). The suspension including a partial cross section is shown in the FF direction arrow view of FIG. It is explanatory drawing which shows the followable | trackability of a wheel in case the 3rd wheel gets into the road surface with a hollow with the conventional suspension.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container carrier 26 Hydraulic cylinder 27d Oil chamber of hydraulic cylinder 28 Piston 28a Recessed part 28b Upper surface of a recessed part 29 Bearing member (thrust bearing)
29a Lower ring of bearing member 29b Upper ring of bearing member 30 Holding member 31 Support member 32 Accumulator 53L, 53R Lower left frame 54L, 54R First wheel 55L, 55R Second wheel 56L, 56R Third wheel (drive wheel) )
57L, 57R 4th wheel 62 Electric motor 65 Axle

Claims (3)

Lower frames are provided on the left and right sides of the vehicle, a plurality of wheels are arranged at the front part of each lower frame, and a single wheel is arranged at the rear part away from the wheels, so that each wheel can be turned horizontally. Each supporting axle is provided through each lower frame in the vertical direction, and either of the front and rear wheels is a driving wheel driven by an electric motor, and a depression in the container yard is formed. In the container carrier that runs on the road with
The upper part of each axle that supports the left and right drive wheels is a hydraulic cylinder, an accumulator is connected to the oil chamber of the hydraulic cylinder, and the left and right drive wheels can independently follow the road surface. Container carrier.   A recess is formed in a lower portion of a piston built in each hydraulic cylinder, a bearing member for preventing the piston and the axle from rotating together is provided in the recess, and a lower ring support member of the bearing member is the axle. The container carrier according to claim 1, wherein the container carrier is connected to an upper end portion of the bearing member so that an upper ring pressing member of the bearing member is in close contact with the upper surface of the concave portion. The first wheel and the second wheel as well as the third wheel and the fourth wheel are arranged at the rear part away from the third wheel at the front part of each lower frame, and the third wheel is used as a drive wheel. The container carrier according to claim 1 or 2, characterized by the above.

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