JP4428513B2 - Transporter - Google Patents

Description

  The present invention relates to a transport vehicle for transporting luggage or the like on a premises such as a wholesale market, a factory, or a warehouse.

  Conventionally, as such a transport vehicle, for example, as described in Patent Document 1, a front wheel provided at a front portion of a vehicle body, a drive source that drives the front wheel, and a power transmission mechanism that transmits a driving force from the drive source to the front wheel And a cover body that protects the drive source and the power transmission mechanism are integrally turned by a steering operation to be steered. In addition, as described in Patent Document 2 or 3, there is a type in which the front body, the drive source, and the power transmission mechanism are integrally turned by a handle operation without turning the cover body.

FIG. 9 is a diagram showing such a conventional transport vehicle. Here, A is a side view and B is a plan view. FIG. 10 is an enlarged view of the front portion of the vehicle body of the transport vehicle of FIG. 9, wherein A is a front view and B is a side view. The transport vehicle shown in FIGS. 9 and 10 is of a type that is steered so that the cover body that protects these in addition to the drive source and the power transmission mechanism is also turned integrally by a handle operation. .
Hereinafter, based on FIG.9 and FIG.10, the outline | summary of the conventionally well-known structure of the transport vehicle which is the object of this invention is demonstrated.

First, the transport vehicle has front wheels F and rear wheels R, R ′ at the front and rear portions of the vehicle body consisting of the body frames 1, 1 ′, and the vehicle body is provided with various components. Is. In general, the front wheel F is a single wheel and serves as both a driving wheel and a steering wheel. On the contrary, the rear wheels R and R ′ are composed of two wheels because they need to bear the loads of various loads placed on the loading platform L.
At the rear of the vehicle body, a loading platform L is provided for transporting the cargo, which is the mission of this type of transport vehicle. The loading platform L is placed on the vehicle body frame 1, 1 ′. On the other hand, as shown in FIG. 10, an equipment storage chamber M for storing a prime mover for applying a driving force to the front wheel F, a driving force transmission device for transmitting the driving force from the prime mover to the front wheel F, and the like is provided at the front of the vehicle body. Is provided. The device storage chamber M is supported at the front part of the body frame 1, 1 ′. Here, a floor 5 ′, which is a flat plate-like member, is disposed on the upper surface of the front portion of the body frame 1, 1 ′, and therefore the equipment storage chamber M is positioned above the floor 5 ′. Further, a bumper S is provided at the front end of the vehicle body for reducing the impact at the time of collision.
On the other hand, a driver's cab O is provided at the center of the vehicle body for a driver driving the transport vehicle to operate the transport vehicle. The driver's cab O is composed of a floor 5 that is a flat plate-like member disposed on the center portion of the vehicle body frame 1, 1 ′. The cab O is provided with a braking device B for applying a braking force to the rear wheels R and R ′ to brake the transport vehicle. The driver stands on the floor 5 and from there the steering handle H or the accelerator A or the braking device B provided on the cab O disposed above the equipment storage room M provided at the front of the vehicle body. Operate the pedal to perform various controls of the transport vehicle. Here, between the cab O and the loading platform L, a backrest W is provided that isolates the cab O and the loading platform L and can serve as a backrest for a driver who has boarded the cab O.

  The transport vehicle transmits a driving force from the prime mover P to the front wheels F via the driving force transmission device D, thereby driving the front wheels F to rotate. Specifically, for example, after an energy is drawn into the device storage chamber M through an appropriate means from an energy source (not shown) mounted at the rear part of the vehicle body, the control (not shown) mounted in the device storage chamber M is used. It is input to the device and the like to drive and control the prime mover P, thereby operating the transport vehicle in accordance with the driver's will.

By the way, as shown in FIG. 10, the driving force from the prime mover P is transmitted to the front wheels F via a driving force transmission device D generally formed of a cord-like body such as a chain or a belt. Here, in the conventionally known transport vehicle, the floor 5 ′ is provided with an opening capable of allowing the driving force transmission device D to turn. In addition, in order to pass the chain 11 and the like, the bottom surface of the device storage chamber M is provided with a portion opened to the road surface.
Therefore, the structure is such that muddy water, dust, and the like splashed up by the rotational drive of the front wheel F can enter the device storage chamber M directly or through the driving force transmission device D including the chain 11, the sprocket 12, and the like. . Therefore, there were the following problems.

  That is, if the muddy water or the like adheres to electrical components such as a control device (not shown) disposed in the device storage chamber M, there is a risk of causing these failures. Also, if such muddy water frequently enters or stays in the equipment storage chamber M, the cleanliness in the equipment storage room M is not maintained, causing rusting and eventually corrosion. .

  Furthermore, there is a possibility that such muddy water or the like flows into the surface of the floor 5 or 5 'from the open part or the like at the bottom of the equipment storage room M, or oozes out, so that the surface of the floor 5 or 5' is clean. However, there was a problem that rust and corrosion would occur as in the above case. If the corrosion of the floor progresses, it will also lead to a decrease in vehicle body rigidity.

  In addition, oil and grease applied to the chain 11 and the sprocket 12 for transmitting power to the front wheels F, together with the muddy water, from the open part at the bottom of the equipment storage chamber M and the like on the body frame 1, 1 ′. In many cases, it flows into the surface of the floors 5 and 5 'arranged on the floor and adheres to the surfaces of the floors 5 and 5'. In that case, a driver who stands on the floor 5 may slide his / her foot. Therefore, improvement was desired from the aspect of health and safety.

  On the other hand, in recent years, universal design of various industrial products has been socially promoted. For transport vehicles having the above-described configuration, the ground height of the floor 5 of the cab O is lowered and the cab O is lowered. Therefore, it is required to improve the ease of getting on and off the transport vehicle and to realize a vehicle body structure that is friendly to the driver.

Even in such a case of lowering the floor, a structure in which muddy water splashed by the rotational drive of the front wheel F does not enter the inside of the equipment storage room M or the surfaces of the floors 5 and 5 ′. It is desirable to do.
JP 2001-191801 A JP-A-6-144239 JP-A-6-144244

  Therefore, according to the present invention, the muddy water and dust splashed by the rotational driving of the front wheels do not enter or exude into the interior of the equipment storage room or the floor surface. It is an object to obtain a transport vehicle that can keep the surface clean.

  Another object of the present invention is to improve the boarding / exiting performance of the transport vehicle by lowering the ground clearance of the cab floor and lowering the cab so as to realize a vehicle body structure that is friendly to the driver.

The transport vehicle of the present invention capable of solving the above problems is (1) a front wheel is provided below an equipment storage chamber provided at the front part of the vehicle body, and a rear wheel is provided below the cargo bed placed at the rear part of the vehicle body. Further provided with a steering handle for turning the front wheel above the device storage chamber, and a partition wall separating the device storage chamber from the outside at a lower portion of the device storage chamber. A prime mover disposed in the equipment storage chamber for driving the front wheels, and a driving force transmission device for supporting the front wheels and transmitting a driving force from the prime movers to the front wheels,
The vehicle body includes a front frame that supports the equipment storage room, and a cab arranged between the front frame and the cargo bed,
The front frame has a floor member whose upper surface is substantially flush with the upper surface of the driver's cab, and a tubular member that is erected on the floor member in the equipment storage chamber and opens upward and downward. A support member,
The equipment storage chamber includes a column that is disposed so as to surround the support member and is supported by the support member, and a side cover member that is provided so as to cover the column.
The partition wall is formed in a cover plate shape, and is provided so as to cover the upper opening portion of the support member above the through hole provided in the side cover member,
The driving force transmission device is turnably provided on the partition wall, and the driving force transmission device and the front wheel are turned together as the steering handle is operated.

  With such a configuration, even if water or the like enters from the through hole, such water or the like does not enter the gap between the surface of the partition wall and a bearing described later provided in the partition wall, The support rigidity of the driving force transmission device supported by the partition wall can be prevented from being lowered by rust or corrosion, and the driving force transmission device can be stably supported by the partition wall for a long period of time.

  In the transport vehicle of the present invention (1), (2) the front wheel is provided such that the upper part protrudes upward from the upper surface of the floor member and the driver's cab, and the support member is the front wheel. It is preferable to be provided so as to cover the periphery of the upward projecting portion.

Here, in the transport vehicle having the configuration of the present invention (1) or (2) , (3) the driving force transmission device includes a transmission mechanism in which an input side is coupled to the prime mover and an output side is coupled to the front wheel. The casing member is preferably provided on the partition wall via a bearing.
In addition, when the transmission mechanism of the driving force transmission device adopts a mechanism that transmits the driving force by interposing a cord or belt, such as a chain or belt, it is necessary to adjust the tension or check the tension. There is a lot of noise during operation, and it is necessary to replenish the chain with lubricant. Therefore, adopting a transmission mechanism that transmits a driving force using a combination of gears and shafts as the transmission mechanism simplifies maintenance work by eliminating the adjustment and inspection work, and can suppress noise during operation. .
Also, if the transmission mechanism is housed in a casing member and sealed, the muddy water and dust splashed up by the rotational drive of the front wheels will not enter the transmission mechanism, and the inside of the transmission mechanism can be kept clean. In addition, the muddy water or the like can be prevented from entering the equipment storage chamber through the transmission mechanism.

In the transport vehicle of the present invention (3) , (4) the casing member is formed with a fitting portion into which the bearing is fitted, and a portion below the fitting portion is the bearing. Is preferably formed so as to cover from below. As a result, the bearing itself can be prevented from being splashed with muddy water splashed by the rotational drive of the front wheels, and muddy water or the like can enter from between the bearing and the fitting portion of the casing member, Muddy water or the like can be prevented from entering between the bearing and the partition wall from below.

Furthermore, in the transport vehicle of the present invention (3) or (4) , (5) the casing member is formed with a fitting portion into which the bearing is fitted, and at a position above the fitting portion. More preferably, a support base for supporting the prime mover is provided, and the support base is formed so as to cover the bearing from above. As a result, it is possible to prevent dust and the like entering the equipment storage chamber from being applied to the bearing itself, and dust and the like from entering between the bearing and the fitting portion of the casing member. It is possible to prevent dust and the like from entering from above. Further, even if muddy water or the like enters from below between the bearing and the fitting portion of the casing member or between the bearing and the partition wall, it can be prevented from going further to the prime mover or the like.

In the following, terms used in the description of the present invention are defined.
In the present invention, “rotation” refers to the angular displacement of the front wheels or rear wheels that occurs as the transport vehicle travels, or the motor, front wheels, and also the driving force transmission device that occurs when the driving force is transmitted from the prime mover to the front wheels. It shall indicate all of the motion accompanied by the angular displacement that occurs in the gears, shafts and other components for transmission of driving force.
Further, in the present invention, “rotation” means not only rotation in one direction around a certain axis but also bi-directional rotation in the left and right directions, and is not limited to one round, but a certain range around a certain axis. It also means the angular displacement of.
On the other hand, “turning” in the present invention typically means a steering in which the turning axis is in the vertical direction or in a direction inclined by a predetermined angle from the vertical direction, and the vehicle can turn substantially horizontally with respect to the vehicle body. By displacing the steering wheel, the front wheel, or the driving force transmission device by a predetermined amount of angle, all of the movements that realize the steering of the transport vehicle are indicated.
Similarly, in the present invention, “turning” means not only a one-way angular displacement centered on a certain axis but also a left-right bi-directional angular displacement. It also means a certain range of angular displacement.

Further, in the present invention, the turning shaft of the driving force transmission device is not limited to the shaft corresponding to the input shaft of the driving force transmission device, but is an axis representing the center of turning when the driving force transmission device is turned. In this case, the actual or virtual one is called a turning axis.
Similarly, the “swivel axis” or “rotation axis” in the present invention refers to an axis that represents the center of rotation or rotation, and whether it is a real or virtual axis, It shall be called a rotating shaft.

  By the way, in the present invention, the arrangement of the prime mover can be set as appropriate, but the input shaft of the driving force transmission device connected to the output shaft of the prime mover and the turning shaft of the driving force transmission device are substantially on the same axis. Thus, it is preferable to fix the prime mover to the driving force transmission device.

  Here, in the present invention, as the prime mover, an internal combustion engine fueled with gasoline or natural gas, an electric motor (motor), or the like may be used. However, as described above, driving force transmission coupled to the output shaft of the prime mover. When the prime mover is fixed to the driving force transmission device so that the input shaft of the device and the turning shaft of the driving force transmission device are substantially on the same axis, it is preferable to employ an electric motor. That is, since the electric motor has a substantially symmetrical structure with respect to the rotating shaft of the rotor, that is, the output shaft of the electric motor, the center of gravity of the electric motor is located on the substantially same axis as the output shaft. Therefore, by placing the motor vertically so that the output shaft is in the vertical direction and arranging the output shaft and the turning shaft of the driving force transmission device on the same axis, the position of the center of gravity of the motor can transmit the driving force. It can be made to be on substantially the same axis as the pivot axis of the apparatus.

  In this way, the inertia of the electric motor at the time of turning hardly affects the operation of the steering wheel, so that the operation can be performed lightly and the steering wheel is not carried by the inertia of the electric motor. Further, since the center of gravity moves little in the longitudinal direction of the vehicle body and in the lateral direction of the vehicle body even if the electric motor turns due to the turning of the driving force transmission device, there is no possibility that the weight balance of the transport vehicle as a whole is impaired.

  Further, as described above, if the input shaft of the driving force transmission device is arranged on substantially the same axis as the turning shaft of the driving force transmission device, both the transmission of the driving force from the prime mover and the turning of the driving force transmission device can be achieved. Therefore, the driving force transmission device can be provided such that the turning axis thereof is in the vertical direction, and the turning axis can be provided by being inclined by a predetermined angle from the vertical direction. If the turning shaft of the driving force transmission device is tilted, a force is exerted to direct the front wheels in the direction in which the turning shaft is inclined. For example, the turning shaft of the driving force transmission device is tilted in the longitudinal direction of the vehicle body. If it is provided, a force acts to bring the front wheels into the front-rear direction of the vehicle body, that is, to move straight. As a result, the straight traveling performance of the transport vehicle is improved, and it becomes easy for the driver to keep the front wheels in the straight traveling state when operating the steering wheel, and the burden is further reduced.

According to the present invention, the partition wall that separates the device storage chamber from the outside is provided in the lower portion of the device storage chamber, so that muddy water and dust that are splashed by the rotational drive of the front wheels are generated in the interior of the device storage chamber. The equipment storage room can be spatially separated from the road surface without entering or exuding the surface of the floor member, so that the interior of the equipment storage room and the surface of the floor member can be kept clean. It becomes possible. Therefore, according to the present invention, the components of the transport vehicle including the floor member can be protected from rust and corrosion, so that the mounting rigidity of each component of the transport vehicle can be maintained, and as a result, the life of the transport vehicle can be extended. In addition to being able to accomplish, electrical equipment provided in the equipment storage room above the floor member is not affected by muddy water, etc., so it is possible to prevent the breakdown of the transport vehicle and improve the reliability of the transport vehicle. .
Moreover, according to the present invention, the floor of the cab can be lowered, and a vehicle-body structure that is gentle to the driver can be realized.
Furthermore, according to the present invention, it is not necessary to separately provide a mudguard cover or the like for preventing muddy water or the like splashed up on the interior of the equipment storage room or the floor member surface, and the construction of the interior of the equipment storage room or the floor member is simplified. In addition, since no extra components are required, the cost can be reduced.

  As described above, according to the configuration of the present invention, the ground height of the cab floor can be lowered, the cab floor can be lowered, and muddy water and dust splashed by the rotational drive of the front wheels can be collected in the equipment storage room. Since it does not enter the interior or the surface of the floor member, it is possible to realize a vehicle body structure of a transport vehicle that has high ease of getting on and off and high mechanical reliability.

  In addition, according to the configuration of the present invention, as illustrated in FIG. 3 to be described later, the front wheel, the driving force transmission device, the prime mover, and the driving force transmission device and the partition wall are provided. It is possible to complete the main assembly of the front part of the vehicle body simply by attaching the assembly to the partition wall in advance so that the bearings that can be swiveled are prepared in advance. It is also possible to improve workability during production and repair.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an overall view showing a transport vehicle according to the present invention, in which A is a side view and B is a plan view. FIG. 2 is a side view showing the front part of the transport vehicle, in which A is a state where the side cover is removed, and B is a state where the side cover is attached. 3 is an exploded perspective view showing the state of the front part of the transport vehicle according to the present invention in detail, and FIG. 4 is a cross-sectional view taken along the line II of FIG. 1B, and is an enlarged perspective view of the front part of the transport vehicle as viewed from the front side. 5 is an enlarged plan view of the vicinity of the partition wall as the upper wall of the housing, FIG. 6 is a sectional view taken along the line II-II in FIG. 2B, and FIG. 7 is an enlarged perspective view showing the rear part of the transport vehicle. FIG. 8 is a side view showing in detail the state of the rear part of the transport vehicle according to the present invention, where A is an exploded view and B is a view showing an assembled state.

[Constitution]
FIG. 1 is an overall view showing a transport vehicle according to the present invention.
As shown in FIG. 1, the transport vehicle of this embodiment has front wheels F and rear wheels R, R ′ at the front and rear portions of a vehicle body composed of vehicle body frames 1, 1 ′ provided in the longitudinal direction of the vehicle body. The vehicle body is provided with various components. Here, the front wheel F is composed of one wheel and serves as both a driving wheel and a steering wheel, while the rear wheels R and R ′ are composed of two wheels. As will be described later, the front wheel F is provided below a device storage chamber M supported on a front frame including a floor 5 ′ provided on the body frame 1, 1 ′ and a housing 2 provided on the floor 5 ′. . A rear axle 42 corresponding to the rotation shaft of the rear wheels R and R ′ is provided on a rear axle holding portion 40 that is a frame (rear frame) that is provided at the rear end of the vehicle body frame 1 and 1 ′. , And are attached via fixtures 41 and 41 ′.

A loading platform L is provided at the rear of the vehicle body. The loading platform L is placed on the vehicle body frame 1, 1 ′.
On the other hand, in the front part of the vehicle body, there is provided a device storage chamber M for storing a prime mover for applying a driving force to the front wheels F, a driving force transmission device for transmitting a driving force from the prime movers to the front wheels F, and others. The equipment storage chamber M is supported on a front frame composed of a floor 5 ′, which is a flat member provided on the body frame 1, 1 ′, and a housing 2 provided on the floor 5 ′. Therefore, the equipment storage room M is located above the floor 5 ′. Further, a bumper S is provided at the front end of the vehicle body for reducing the impact at the time of collision.

  On the other hand, a cab O in which a flat floor 5 is provided on the vehicle body frames 1 and 1 ′ is provided at a substantially central portion of the vehicle body. Since the driver's cab O has many opportunities for a driver wearing wet footwear to stand, the floor 5 is made of, for example, a relatively thick striped steel plate. A driver stands on the floor 5 and a braking device provided on a steering handle H, an accelerator A, or a driver's cab O provided above an equipment storage room M provided at the front of the vehicle body from there. Operate the B pedal to perform various controls on the transport vehicle. A backrest W is provided between the cab O and the loading platform L so as to isolate the cab O and the loading platform L and can serve as a backrest for a driver who has boarded the cab O.

Next, it demonstrates still in detail about the structure of the vehicle body front part of the transport vehicle which concerns on a present Example.
As shown in FIGS. 1 and 2, a floor 5 ′ is provided on the vehicle body frames 1, 1 ′ on the equipment storage chamber M side in front of the cab O side as well as the cab O side. The floor 5 ′ is provided on the body frame 1, 1 ′ so as to be flush with the upper surface of the floor 5 of the cab O. The floor 5 ′ is also made of a flat steel plate or the like like the floor 5.

On the floor 5 ′, the housing 2 is provided in the manner described below. As shown in FIGS. 2 to 6, the housing 2 has a bottomed cylindrical shape with an opening on the lower side, and includes a support member 21 as a side wall and a partition wall 22 as an upper wall. The support member 21 has a cylindrical shape opened upward and downward, and is erected on the floor 5 ′ with its outer periphery fitted into the opening 6 opened in the floor 5 ′. The partition wall 22 is provided in the lower part of the device storage chamber M and is used to spatially isolate the device storage chamber M from the outside, that is, from the road surface side.
As shown in FIGS. 3 to 6, the opening 6 and the support member 21 erected on the floor 5 ′ while being fitted in the opening 6 allow the front wheel F to turn with the turning operation of the steering handle H. As will be described later, the front wheel F and the driving force transmission device D are considered to be able to turn integrally with respect to the vehicle body in the housing 2. As shown in FIGS. 2 to 4, in the present embodiment, the front wheel F is provided so that the upper part protrudes upward from the upper surfaces of the floors 5 and 5 ′, and the support member 21 is an upper protruding part of the front wheel F. It is provided to cover the surroundings.
On the other hand, the partition wall 22 of the housing 2 has a lid plate shape and is coupled to the upper end of the support member 21 so as to cover the upper opening of the support member 21 as shown in FIGS.

The partition wall 22 includes a bearing 3 as shown in FIGS. 3 to 5, and the driving force transmission device D is supported via the bearing 3 so as to be rotatable with respect to the partition wall 22, the housing 2, and the vehicle body. Yes.
Therefore, the front wheel F and the driving force transmission device D can turn integrally with respect to the vehicle body in the housing 2. At this time, as shown in FIGS. 2 and 4, the front wheel F protrudes above the surface of the floor 5 ′ by appropriately changing the height h <b> 1 of the support member 21 that is the side wall of the housing 2 to which the partition wall 22 is coupled. Since the amount can be adjusted, as a result, the ground level of the floor 5 ′ can be lowered and the cab O can be lowered.

Here, the partition wall 22 has a hole 23 for installing the bearing 3, and the bearing 3 is attached so as to exactly match the hole 23. Therefore, the inner side (road surface side) and the outer side (device storage chamber side) of the housing 2 are configured in a spatially isolated form. The hole 23 also plays a role of transmitting power as will be described later, and a driving force for rotationally driving the front wheel F is transmitted to the front wheel F through the hole 23.
Therefore, according to the configuration of the present embodiment, the muddy water and dust splashed up by the rotational drive of the front wheel F do not enter or exude from the inside of the housing 2, and the device storage room M is not spilled out. Since it can be spatially separated from the road surface side, the inside of the equipment storage room M and, in turn, the surface of the floor 5 'is always kept clean.

By the way, in the present embodiment, the housing 2 is disposed so as to surround the housing 2, for example, and is attached so as to cover the plurality of columns 7 standing on the surface of the floor 5 ′ and these columns 7. It is provided in an equipment storage chamber M having a side cover 8.
These pillars 7 are erected on the surface of the floor 5 'as described above, and as shown in FIGS. 2 to 4, the brackets 24 are provided so as to protrude from the surface of the support member 21 corresponding to the side wall of the housing 2. The structure to attach is mentioned.

As shown in FIG. 2B, the side cover 8 is normally provided with through holes 9 as appropriate for the purpose of releasing heat from the electrical components and other heat generating components in the device storage chamber M or emitting sound from the horn.
At this time, if the partition wall 22 is arranged above the through hole 9 and is configured so that h1> h2 in FIG. 2, even if water or the like enters from the through hole 9, such water Does not enter the gap between the surface of the partition wall 22 and the bearing 3 provided on the partition wall 22. Therefore, the support rigidity of the driving force transmission device D supported by the partition wall 22 of the housing 2 is rusted or corroded. And the driving force transmission device D can be stably supported on the partition wall 22 of the housing 2 for a long period of time.

Next, the support base 4 is fixed to the upper part of the driving force transmission device D as shown in FIGS. A prime mover P for inputting a driving force for rotationally driving the front wheels F to the input shaft 101 of the driving force transmission device D is fixed on the support 4.
Therefore, in the transport vehicle according to the present embodiment, the front wheel F, the driving force transmission device D, and the prime mover P are provided so as to be able to turn integrally with the vehicle body.

In this embodiment, the prime mover P is an electric motor. Here, since the electric motor has a substantially symmetrical structure with respect to the rotating shaft of the rotor, that is, the output shaft of the electric motor, the center of gravity of the electric motor is positioned on the same axis as the output shaft. Therefore, in this embodiment, the motor is placed vertically so that the output shaft is in the vertical direction, and the output shaft and the turning shaft of the driving force transmission device D are arranged on the same axis, so that the center of gravity of the motor can be obtained. The position is configured to be substantially on the same axis as the turning axis of the driving force transmission device D.
Further, in the present embodiment, as shown in FIG. 4, the prime mover P has the input shaft 101 of the driving force transmission device D connected to the output shaft 10 of the prime mover P and the turning shaft of the driving force transmission device D substantially the same axis. It is being fixed on the support stand 4 provided above the driving force transmission device D so that it may become upper.

  In this embodiment, as shown in FIG. 4, the driving force transmission device D is configured to support the front wheel F in a cantilevered manner, mainly from the axle 100 that rotatably supports the front wheel F. A front wheel support section, a transmission section for coupling the input shaft 101 connected to the output shaft 10 of the prime mover P and the axle 100 of the front wheel support section by a combination of a plurality of gears and shafts, and the front wheel support section and the transmission section. And a casing portion.

  The front wheel support portion includes an axle 100 and a bearing that rotatably supports the axle 100. As shown in FIG. 4, the axle 100 is arranged in a horizontal state so as to rotate around its central axis. A disc portion 100a to which the front wheel F is fixed is formed on one end side of the axle 100, and a gear 100b connected to the transmission portion is fixed to the other end side. And this gear 100b is rotated by the gear 106 of the transmission part mentioned later, The gear 100b, the axle 100, the disk part 100a, and the front wheel F rotate integrally, and, thereby, a conveyance vehicle drive | works.

  As shown in FIG. 4, the transmission section includes an input shaft 101 connected to the output shaft 10 of the electric motor as the prime mover P, a gear 102 fixed to the lower end portion of the input shaft 101, a gear 103 that meshes with the gear 102, A gear 104 connected to the gear 103 through a shaft and rotated together with the gear 103, a gear 105 engaged with the gear 104, and a gear 106 connected to the gear 105 through the shaft and rotated together with the gear 105 are provided. -106 and each shaft are rotatably supported by bearings. The gear 106 is disposed so as to mesh with the gear 100b of the axle 100. When the output shaft 10 of the motor serving as the prime mover P is rotated and the input shaft 101 is rotated, the rotation of the input shaft 101 is the gears 102 to 106 of the transmission unit. Is transmitted to the axle 100 through which the front wheel F rotates. Such a mechanism from the input shaft 101 to the axle 100 is the transmission mechanism in the present invention.

As shown in FIG. 4, the casing part is formed so as to accommodate the front wheel support part and the transmission part except for the disk part 100 a of the axle 100 to which the front wheel F is fixed and the upper part of the input shaft 101. The upper casing 107 accommodates the upper portion of the upper casing 107, and the lower casing 108 accommodates the lower casing 107 at a position below the upper casing 107 from the transmission portion to the front wheel support portion. In the present embodiment, the upper casing 107 has a cylindrical shape surrounding the input shaft 101 and forms a fitting portion into which the bearing 3 is fitted. The support 4 is fixed to the upper part of the upper casing 107. The support 4 is bolted to the upper casing 107 while being placed on the upper end surface of the upper casing 107.
The support base 4 is arranged so that the central axis thereof is on the same axis as the input shaft 101 of the transmission section, and the motor serving as the prime mover P has its output shaft 10 on the same axis as the central axis of the support base 4. It is arranged to become. Therefore, the output shaft 10 and the input shaft 101 of the electric motor are arranged on the same axis.

Here, as shown in FIG. 4, the support base 4 is formed in a disk shape having a larger diameter as viewed from the axial direction of the input shaft 101 than the bearing 3 and the upper casing 107. Accordingly, the support base 4 is formed so as to cover the bearing 3 from above. As a result, it is possible to prevent dust or the like entering the device storage chamber M from being applied to the bearing 3 itself, and dust or the like from entering between the bearing 3 and the upper casing 107 (fitting portion). It is possible to prevent dust and the like from entering between 3 and the partition wall 22 from above. Further, even if muddy water or the like enters from between the bearing 3 and the upper casing 107 or between the bearing 3 and the partition wall 22 from below, it can be prevented from going further to the prime mover P or the like.
The lower casing 108 is larger in size than the bearing 3 and the upper casing 107 that is a fitting portion with the bearing 3. Therefore, the lower casing 108 is formed so as to cover the bearing 3 from below. Accordingly, it is possible to prevent the bearing 3 itself from being splashed with muddy water splashed by the rotational drive of the front wheel F, and to allow muddy water or the like to enter between the bearing and the upper casing 107 from below. Muddy water and the like can be prevented from entering between the partition wall 22 from below.
As described above, since the support 4 and the lower casing 108 are formed so as to cover the bearing 3 from above and below, in the transport vehicle of the present embodiment, muddy water or the like splashed by the rotational drive of the front wheel F is stored in the equipment. It is possible to reliably prevent the inside of the chamber M and the surfaces of the floors 5 and 5 'from entering, the inside of the equipment storage room M and the surfaces of the floors 5 and 5' can be kept clean, and the bearing 3 itself Alternatively, it is possible to reliably prevent dust and muddy water from entering between the bearing 3 and the upper casing 107, and the driving force transmission device D can be smoothly turned.

[Operation]
The transport vehicle according to the present embodiment is configured to transmit the driving force from the electric motor as the prime mover P to the front wheel F via the driving force transmission device D and to travel by the rotation of the front wheel F. In the present embodiment, an unillustrated battery or the like mounted on the rear part of the vehicle body is used as an energy source, and energy is appropriately drawn into the device storage chamber M via a distribution line, and then the obtained energy is transferred to the device storage chamber The motor, which is the prime mover P, is driven while inputting to a control device (not shown) mounted in M and adjusting the amount of energy and the like using this.

Thus, in the transport vehicle of the present embodiment, the floor 5 ′ disposed on the vehicle body frame 1, 1 ′ supporting the equipment storage chamber M provided at the front of the vehicle body opens upward and downward. It has a cylindrical shape and covers a support member 21 erected on the floor 5 ′ with its outer periphery fitted into an opening 6 opened in the floor 5 ′, and an upper opening of the support member 21. In addition, a housing 2 comprising a lid plate-like partition wall 22 coupled to the upper end of the support member 21 is provided, and the partition wall 22 has the above-described structure so that the inside and the outside of the housing 2 can be spatially separated. A bearing 3 is provided in such a manner that the hole 23 formed in the partition wall 22 is closed without any gaps. Further, the driving force transmission device D is attached to the partition wall 22 with respect to the vehicle body via the bearing 3. It is provided so as to be able to turn, inside the housing 2 The front wheel F and the driving force transmission device D are configured to be able to turn integrally with respect to the vehicle body.
Therefore, according to the transport vehicle of the present embodiment, it is possible to reduce the floor of the cab O and to realize a vehicle body structure that is friendly to the driver. Further, in the transport vehicle of the present embodiment, the muddy water and dust splashed by the rotational drive of the front wheel F do not enter or ooze into the inside of the equipment storage chamber M or the surfaces of the floors 5 and 5 ′. Since the equipment storage room M can be spatially separated from the road surface side, the inside of the equipment storage room M and the surfaces of the floors 5 and 5 'can be kept clean.

In addition, in the present embodiment, it is necessary to lower the floor of the rear portion of the vehicle body as the floor of the front portion of the vehicle body is realized by the configuration of the present embodiment described above. This is achieved with the configuration shown in FIG.
That is, the rear axle 42 is coupled to the bottom surface of the rear axle holding portion 40 via the fixtures 41 and 41 ′. The bottom surface of the rear axle holding portion 40 is above the bottom surface of the body frame 1, 1 ', and therefore the rear axle 42 is disposed above the conventional structure, thereby lowering the ground height of the body frame 1, 1'. Is possible.
With this configuration, the floor of the entire vehicle body can be reduced in the transport vehicle of this embodiment.

  In the first embodiment, the driving force transmission device D is installed on the floor 5 'of the transport vehicle via the housing 2 having a desired height h1 as shown in FIGS. In such a transport vehicle, the ground height of the floor 5 'is lowered by this height h1 with respect to the conventionally known transport vehicle.

  By the way, in order to achieve one of the objects of the present invention to keep the surface of the floor 5 'clean at all times, structurally, the inside (road surface side) and the outside (device storage room side) of the floor 5' However, it is only necessary to be spatially isolated.

  Therefore, the housing 2 as in the first embodiment is not formed, the partition wall 22 is provided directly on the same surface as the floor 5 ′ below the equipment storage chamber M, and the driving force transmission device D is mounted on the bearing. 3 is provided so as to be able to turn with respect to the vehicle body through the water 3, mud splashed by the rotating front wheel F does not flow onto the surfaces of the floors 5 and 5 ', and the equipment storage room M is provided on the road surface. Since it can be spatially separated from the side, the inside of the equipment storage room M and the surfaces of the floors 5 and 5 'can be kept clean.

  On the other hand, according to such a configuration, it is not possible to obtain the above-described action or effect that is obtained as the cab is lowered.

The present invention is not limited to those described in the above embodiments, and various design changes can be made.
For example, the shape of the housing 2 is not limited to a cylindrical shape, and may have a polygonal cross section as appropriate.

  In each of the above embodiments, an electric motor is used as the prime mover P, and the electric motor is placed vertically so that the output shaft is in the vertical direction, and the output shaft 10 of the motor and the input shaft 101 of the driving force transmission device D are on the same axis. However, the type, installation mode, and input method of the driving force to the driving force transmission device D are not limited to those described in the above embodiments. Therefore, an internal combustion engine may be used as the prime mover P. In addition, the prime mover P is placed horizontally so that the output shaft 10 is in the horizontal direction, and a bevel gear or the like is provided so that the drive force can be transmitted between the output shaft 10 of the prime mover P and the input shaft 101 of the drive force transmission device D. It may be configured to be mechanically connected via

  Further, in each of the above embodiments, the driving force transmission device D that transmits a driving force by a gear is used. However, the configuration of the driving force transmission device D is not limited to this, and for example, in each of the above embodiments, It is good also as a thing of the aspect which ropes, such as a chain and a belt, transmit a driving force instead of all or one part of the gearwheel and shaft in the casing of the driving force transmission apparatus D demonstrated.

  Further, in each of the above embodiments, it is assumed that the driving force transmission device D is provided on the vehicle body so that the turning axis thereof is in the vertical direction. For example, the driving force transmission device D may be installed on the partition wall 22 or the floor 5 ′ of the housing 2 in such a manner that the turning shaft of the driving force transmission device D is inclined from the vertical direction to the rear of the vehicle body by a predetermined angle. I do not care.

  In this way, the force acts on the front wheel F so that the direction of the front wheel F is the same as the turning shaft of the driving force transmission device D, that is, the vehicle is in a straight-forward state directed in the longitudinal direction of the vehicle body. By changing the direction of the front wheel F, it becomes easy to restore the straight traveling state from the state of turning, and it becomes easy to hold the steering wheel H in the straight traveling state, thereby reducing the burden on the driver.

  As described above in detail, the present invention prevents the muddy water and dust splashed by the rotational drive of the front wheels from entering or exuding the inside of the equipment storage room or the surface of the floor. The interior of the car and the surface of the floor can be kept clean, the ground level of the cab floor can be lowered, and the floor of the cab can be lowered. It is clear that it is.

It is a general view which shows the transport vehicle which concerns on this invention, Comprising: A is a side view, B is a top view. It is a side view which shows a conveyance vehicle front part, Comprising: A is the state which removed the side cover, B is the state which attached the side cover. It is a disassembled perspective view which shows the mode of the transport vehicle front part which concerns on this invention in detail. It is the II sectional view taken on the line of FIG. 1B, Comprising: It is the expansion perspective view which looked at the conveyance vehicle front part from the front side. It is the top view to which the partition wall vicinity of the housing was expanded. It is the II-II sectional view taken on the line of FIG. 2B. It is an expansion perspective view which shows a conveyance vehicle rear part. It is a side view which shows the mode of the rear part of the transport vehicle which concerns on this invention in detail, Comprising: A is an exploded view, B is a figure which shows the state assembled | attached. It is a figure which shows the conventional conveyance vehicle, Comprising: A is a side view, B is a top view. It is an enlarged view of the vehicle body front part of the transport vehicle shown in FIG. 9, A is a front view, B is a side view.

Explanation of symbols

D Driving force transmission device F Front wheel H Steering handle L Loading platform M Equipment storage room O Driver stand P Motor R Rear wheel R 'Rear wheel 1 Body frame 1' Body frame 2 Housing 3 Bearing 4 Support base 5 Floor 5 'Floor 6 Opening 7 Strut 8 Side cover 9 Through hole 10 Output shaft 21 Support member 22 Bulkhead 23 Hole 24 Bracket 100 Axle 101 Input shaft 107 Upper casing (fitting part)
108 Lower casing

Claims (5)

A front wheel is provided below the equipment storage chamber provided at the front part of the vehicle body, a rear wheel is provided below the loading platform placed at the rear part of the vehicle body, and the front wheel is provided above the equipment storage room. A transport vehicle provided with a steering handle for turning, and having a partition that separates the device storage chamber from the outside at a lower portion of the device storage chamber, and is disposed in the device storage chamber to drive the front wheels. And a driving force transmission device that supports the front wheel and transmits a driving force from the motor to the front wheel,
The vehicle body includes a front frame that supports the equipment storage room, and a cab arranged between the front frame and the cargo bed,
The front frame has a floor member whose upper surface is substantially flush with the upper surface of the driver's cab, and a tubular member that is erected on the floor member in the equipment storage chamber and opens upward and downward. A support member,
The equipment storage chamber includes a column that is disposed so as to surround the support member and is supported by the support member, and a side cover member that is provided so as to cover the column.
The partition wall is formed in a cover plate shape, and is provided so as to cover the upper opening portion of the support member above the through hole provided in the side cover member,
The driving force transmission device is turnably provided on the partition wall, and the driving force transmission device and the front wheel are integrally turned in accordance with the operation of the steering handle. The front wheel is provided such that an upper portion thereof protrudes upward from the upper surface of the floor member and the driver's cab, and the support member is provided so as to cover a periphery of an upper protruding portion of the front wheel. The transport vehicle according to claim 1 . The driving force transmission device includes a transmission mechanism whose input side is connected to the prime mover and whose output side is connected to the front wheel, and a casing member that houses the transmission mechanism, and the casing member is provided in the partition via a bearing. The transport vehicle according to claim 1 or 2 , wherein the transport vehicle is provided. The casing member according to claim 3, characterized in that the fitting portion into which the bearing is fitted together with the formation, portions of the lower than the fitting portion is formed so as to cover the bearing from below The transport vehicle described in 1. The casing member is formed with a fitting portion into which the bearing is fitted, and is provided with a support base that supports the prime mover at a position above the fitting portion, and the support base supports the bearing. The transport vehicle according to claim 3 or 4 , wherein the transport vehicle is formed so as to cover from above.

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