JP2004075009A - Transport vehicle - Google Patents

Abstract

An object of the present invention is to provide a transport vehicle that can suppress an increase in the cost of a power train accompanying an increase in the size of a vehicle and that has excellent workability.
A front axle 4F provided at a front portion of a vehicle, a rear axle 4R provided at a rear portion of the vehicle, and an output shaft disposed forward between the front axle 4F and the rear axle 4R. A front engine 1F, a rear engine 1R arranged between the front axle 4F and the rear axle 4R with the output shaft facing rearward, and a front engine 1F connected to the front side of the front engine 1F for driving the front engine 1F with the front axle. 4F, a rear transmission 2R connected to the rear side of the rear engine 1R for transmitting the driving force of the rear engine 1R to the rear axle 4R, two engines 1F, 1R and two transmissions 2F, 2R is fixedly provided, and a body frame 6 for supporting the front axle 4F and the rear axle 4R at the front end and the rear end, respectively, so as to swing about the vertical axis.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transport vehicle.
[0002]
[Prior art]
BACKGROUND ART A transport vehicle is a work vehicle that transports luggage to be unloaded and loaded by a forklift on a luggage carrier, and loads and transports earth and sand, rocks, and the like loaded by a wheel loader or a hydraulic shovel on a tiltable luggage platform. Transport vehicles are required to be larger and have improved running performance in order to improve workability. As means for improving running performance, adoption of four-wheel drive which is excellent in running performance on uneven terrain or sloping terrain is considered.
[0003]
As shown in FIG. 8, in the four-wheel drive power train, the output of the engine 31 is shifted by the transmission 32, and the output of the engine 31 is transmitted from the transmission 32 to the front axle 34F and the rear axle 34R via propeller shafts 33F and 33R. The front and rear wheels 35F and 35R are driven by the transmission.
[0004]
[Problems to be solved by the invention]
However, the above-described prior art has the following problems.
That is, when the size of the transport vehicle is increased, the engine 31 requiring a large output becomes large and special, and similarly, the transmission 32 becomes large and special. For this reason, production facilities and productivity of the engine 31 and the transmission 32 become a problem, and the cost of the power train becomes extremely high. In addition, since the large engine 31 is disposed above the propeller shaft 33R, the center of gravity of the vehicle is increased, running stability is insufficient, and workability is reduced due to the increased height of the vehicle and the height of loading. I do. Further, since the power train is large, the width of the vehicle body frame becomes large and hinders the steering, so that the steering angle is restricted, and the minimum turning radius cannot be reduced.
In passenger cars, there is also an example as in Patent Registration No. 2730034, which is a technique relating to improvement of athletic performance by improving weight balance, and what solves the above-mentioned problem in transport vehicles. is not.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide a transport vehicle that can suppress an increase in the cost of a power train accompanying an increase in the size of a vehicle and has excellent workability.
[0006]
Means for Solving the Problems, Functions and Effects
In order to achieve the above object, a first invention relates to a transport vehicle, comprising: a front axle provided at a front portion of a vehicle and fitted with wheels; a rear axle provided at a rear portion of the vehicle and fitted with wheels; A front engine with the output shaft facing forward between the front and rear axles; a rear engine with the output shaft facing rearward between the front and rear axles; and a front side of the front engine. A front transmission for transmitting the driving force of the front engine to the front axle; a rear transmission connected to the rear side of the rear engine for transmitting the driving force of the rear engine to the rear axle; One transmission is fixedly provided, and a body frame is provided at a front end and a rear end of the front axle and the rear axle, respectively, so as to swingably support a vertical axis.
[0007]
According to the above configuration, two engines, one for the front axle and the other for the rear axle, are mounted on the engine that requires a large output as the size of the transport vehicle increases, so that each engine is relatively small. It can be used with mass-produced products used in other models. Similarly, the transmission also has two transmissions, one for the front axle and one for the rear axle, corresponding to the two engines, so each transmission is relatively small and mass-produced for other models Will be able to respond. For this reason, even if the transport vehicle is large, the engine and the transmission are not large and special for high output, and the cost of the power train can be greatly suppressed.
Further, as shown in FIG. 8, there is no need to dispose the propeller shaft below the engine, so that the engine can be disposed at a lower position. As a result, the center of gravity of the vehicle is lowered, driving stability is improved, and the height of the vehicle is reduced, so that the loading height, which is one of the important performances of the transport vehicle, can be reduced. Is obtained.
Further, since the transmission is small, the width of the body frame near the transmission close to the front and rear axles can be reduced. As a result, even if the steering angle is increased, there is no risk of interference between the wheels and the body frame, so that a transport vehicle having a small minimum turning radius can be obtained.
Further, since the front and rear axles can be steered, the radius of rotation can be reduced by front and rear in-phase steering, and so-called crab running can be performed by reverse-phase steering, so that steering variations can be increased and steering performance can be improved.
[0008]
A second invention based on the first invention has a configuration in which the two engines and the two transmissions are arranged side by side in the center of the vehicle width.
According to this configuration, since the width of the vehicle body frame is reduced, the distance between the wheel and the vehicle body frame is increased on both the left and right sides. As a result, the steering angle can be increased, so that a transport vehicle having a small minimum turning radius can be obtained.
[0009]
According to a third aspect of the present invention, in a transport vehicle, a front axle provided at a front portion of the vehicle and fitted with wheels, a rear axle provided at a rear portion of the vehicle and fitted with wheels, and a front axle and a rear axle are provided. A front engine with the output shaft facing forward, a rear engine with the output shaft facing rearward between the front axle and the rear axle, and a continuous connection to the front side of the front engine via a transfer, A front transmission for transmitting the driving force of the front engine to the front axle; a rear transmission connected to the rear side of the rear engine via a transfer for transmitting the driving force of the rear engine to the rear axle; And a vehicle body frame fixedly mounted so as to be spaced apart by a predetermined distance in the direction and overlapping in the front-rear direction, and the two transmissions being fixedly mounted at the center of the vehicle body width.
[0010]
According to the above configuration, two engines, one for the front axle and the other for the rear axle, are mounted on the engine that requires a large output as the size of the transport vehicle increases, so that each engine is relatively small. It can be used with mass-produced products used in other models. Similarly, the transmission also has two transmissions, one for the front axle and one for the rear axle, corresponding to the two engines, so each transmission is relatively small and mass-produced for other models Will be able to respond. For this reason, even if the transport vehicle is large, the engine and the transmission are not large and special for high output, and the cost of the power train can be greatly suppressed.
Further, as shown in FIG. 8, there is no need to dispose the propeller shaft below the engine, so that the engine can be disposed at a lower position. As a result, the center of gravity of the vehicle is lowered, driving stability is improved, and the height of the vehicle is reduced, so that the loading height, which is one of the important performances of the transport vehicle, can be reduced. Is obtained.
Even if the two front and rear power trains are long, the two engines are arranged so as to be spaced apart in the vehicle body width direction and overlap in the front and rear direction. Since the length can be shortened, and thereby the wheelbase is shortened, the minimum turning radius can be further reduced.
Further, since the two engines are separated from each other by a predetermined distance in the width direction of the vehicle body, a work space can be secured on both sides of each engine, so that the maintenance workability of the engine is improved.
Further, since the transmission is small and arranged at the center of the width of the vehicle body, the width of the vehicle body frame near the transmission close to the front and rear axles can be reduced, and the separation distance between the wheels and the vehicle body frame increases on both the left and right sides. As a result, even if the steering angle is increased, there is no risk of interference between the wheels and the body frame, so that a transport vehicle having a small minimum turning radius can be obtained.
[0011]
Further, a fourth invention based on the third invention is configured such that the front axle and the rear axle are supported by front and rear ends of a vehicle body frame, respectively, so as to be able to swing around a vertical axis.
According to this configuration, since the front and rear axles can be steered, the turning radius can be reduced by in-phase front and rear steering, so-called crab running can be performed by reverse-phase steering, and steering variations can be increased and steering performance can be improved.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings.
In this specification, the front, rear, left, right, and up and down directions mean the front, rear, left, right, and up and down directions of the transport vehicle of the present invention, respectively, unless otherwise specified.
First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view of a transport vehicle, and FIG. 2 is a side view of the transport vehicle.
[0013]
A front axle 4F having wheels 5F and 5F mounted on both sides is provided at the front of the vehicle, and a rear axle 4R having wheels 5R and 5R mounted at both sides at the rear of the vehicle. A front axle 4F and a rear axle 4R are respectively connected to both front and rear ends of the body frame 6 on which the loading platform 8 is mounted. Tongue-shaped brackets 4Fa, 4Fb extend rearward at the upper and lower ends at the center of the front axle 4F, and swing through connection pins 6a, 6b provided at the front end of the body frame 6 via hinge pins 7, 7. It is movably connected. Similarly, tongue-shaped brackets 4Ra, 4Rb extend forward at the upper and lower ends of the center of the rear axle 4R, and hinge pins 7, 7 are attached to connection brackets 6a, 6b provided at the rear end of the body frame 6. Are swingably connected via a. Further, each of the front axle 4F and the rear axle 4R is configured to be steerable with respect to the vehicle body frame 6 by a steering mechanism such as a steering cylinder (not shown).
[0014]
At the center of the body frame 6, the engines 1F and 1R are mounted vertically in a row in front and rear, respectively. Of the two engines 1F and 1R, the front engine 1F has an output shaft directed forward, and a transmission 2F is connected to the front. The rear engine 1R has an output shaft directed rearward, and a transmission 2R is connected to the rear. That is, as shown in FIG. 1, the engines 1F, 1R and the transmissions 2F, 2R are arranged in a line along the front-rear direction substantially at the center of the vehicle width with the engines 1F, 1R inside. Output sides of the transmissions 2F and 2R are connected to a front axle 4F and a rear axle 4R via propeller shafts 3F and 3R, respectively. That is, the output of the engine 1F is transmitted to the front axle 4F via the transmission 2F and the propeller shaft 3F, the output of the engine 1R is transmitted to the rear axle 4R via the transmission 2R and the propeller shaft 3R, and the vehicle is driven by four wheels. I do.
[0015]
According to the above configuration, two engines, a driving engine 1F for driving the front axle 4F and an engine 1R for driving the rear axle, are mounted as power sources that require a large output with the increase in the size of the transport vehicle. Therefore, each of the engines 1F and 1R is relatively small and can be used with mass-produced products used in other models. Similarly, the transmission also has two transmissions 2F, 2R for driving the front axle 4F and the transmission 2R for driving the rear axle 4R, corresponding to the two engines 1F, 1R, respectively. Is relatively small and can be used with mass-produced products used in other models. For this reason, even if the transport vehicle is large, the engines 1F and 1R and the transmissions 2F and 2R are not large and special ones corresponding to high output, and the cost of the power train is greatly reduced. Can be suppressed.
[0016]
Further, since the front axle 4F and the rear axle 4R are each configured to be steerable with respect to the body frame 6, the front axle 4F and the rear axle 4R are steered in phase as shown in FIG. When a small turn is facilitated and a middle turn where the turning radius does not need to be as small as a small turn is performed, only one of the front axle 4F and the rear axle 4R is steered as shown in FIG. 3 (c), the front axle 4F and the rear axle 4R are steered in opposite phases, so-called crab traveling (diagonal traveling) becomes possible, and entry into a narrow site becomes easy. . That is, steering variations are increased and steering performance is improved.
[0017]
In addition, the engines 1F, 1R and the transmissions 2F, 2R are arranged in a line in the front-rear direction substantially in the center of the vehicle body width. In addition, the engines 1F, 1R and the transmissions 2F, 2R are small, The width of the frame 6 can be reduced. As a result, the distance between the wheels 5F, 5R and the body frame 6 increases on both the left and right sides, and the steering angle can be set large, so that the minimum turning radius of the vehicle can be further reduced.
[0018]
Further, as shown in FIG. 8, there is no need to dispose the propeller shaft 33R below the engine 31, so that the arrangement positions of the engines 1F and 1R can be lowered. For this reason, since the transmissions 2F and 2R are also small and located at a low position, the center of gravity of the vehicle is lowered and running stability is improved, and the height of the vehicle is reduced and the loading height, which is one of the important performances of the transport vehicle, is reduced. can do.
[0019]
Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. The same components as those described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 4 is a plan view of the transport vehicle, and FIG. 5 is a side view of the transport vehicle.
[0020]
Engines 1F and 1R are mounted vertically on the left and right sides of the center of the body frame 6, respectively. As shown in FIG. 4, the engines 1F and 1R are arranged so as to be spaced apart by the width of the body frame 6 in the left-right direction and to overlap in the front-rear direction. Has a space for maintenance. Of the two engines 1F and 1R, the right engine 1F has its output shaft directed forward, and its output side is connected to a transmission 2F mounted at the front center of the body frame 6 via a transfer 13F. I have. The left engine 1R has an output shaft directed rearward, and its output side is connected to a transmission 2R mounted at the rear center of the body frame 6 via a transfer 13R.
[0021]
According to the above configuration, the same operation and effect as those of the first embodiment can be obtained, and even when the two front and rear power trains are long, the two engines 1F and 1R are separated from each other in the vehicle body width direction and the front and rear direction. So that the length in the front-rear direction can be shortened by substantially the length of the engine as compared with the case of arranging one row back and forth as in the first embodiment. Can be made compact) and the wheelbase becomes shorter, so that the minimum turning radius can be made smaller.
Furthermore, since the two engines 1F and 1R are separated from each other by a predetermined distance in the vehicle width direction to provide a space for maintenance work, a work space is secured on both sides of each engine 1F and 1R, and maintenance of the engines 1F and 1R is performed. Workability is improved.
[0022]
Note that the present invention is not limited to the above embodiment, and it goes without saying that changes and modifications can be made within the scope of the present invention.
For example, in the above embodiment, the front and rear axles 4F, 4R are described as being connected directly to the body frame 6, but as shown in FIG. 6, the front and rear axles 4F, 4R are connected to the body frame 6 via the sub-frame 9. It does not matter. That is, the sub-frame 9 is swingably connected to the connection brackets 6a, 6b of the body frame 6 via the hinge pins 7, 7, and the front axle 4F is mounted on the sub-frame 9. At this time, as shown in FIG. 6, the use of the shock absorbing mechanism 10 (combination of the suspension cylinder and the rod) for mounting the front axle 4F to the subframe 9 is effective in suppressing the collapse of the load. The same applies to the rear axle 4R.
[0023]
In addition, the axles 4F and 4R having wheels 5F and 5R mounted on both sides are described as being steerably mounted on the body frame 6, but as shown in FIG. 14FR may be provided independently on the left and right, respectively, independently supported by the body frame 16, and the wheels 15FL, 15FR may be configured to be steerable about a substantially ground contact position. Of course, the rear axle 4R may be similarly configured to be left and right independent.
[0024]
The loading platform 8 of the transport vehicle may be a flat loading platform for loading and unloading pallets and containers with a forklift, or a loading platform (dump) provided with a tilting mechanism (eg, a hydraulic cylinder) for unloading soil loaded with a wheel loader or a hydraulic shovel. (Vessel).
The transport vehicle of the present invention can be applied to a manned vehicle provided with a driver's seat, and can also be applied to an unmanned vehicle traveling by radio or by a program.
Further, a transmission with a torque converter may be used as necessary.
Further, in the second embodiment, the example in which the engines 1F and 1R are mounted on the side surface of the body frame 6 has been described. However, if a space for maintenance can be secured between the engines, a part of the engines 1F and 1R is 6 may be mounted.
[Brief description of the drawings]
FIG. 1 is a plan view of a transport vehicle according to a first embodiment.
FIG. 2 is a side view of the transport vehicle according to the first embodiment.
FIG. 3 is an explanatory diagram of a steering pattern.
FIG. 4 is a plan view of a transport vehicle according to a second embodiment.
FIG. 5 is a side view of a transport vehicle according to a second embodiment.
FIG. 6 is an explanatory diagram of an axle connection method according to another embodiment.
FIG. 7 is a schematic plan view of a steering mechanism according to another embodiment.
FIG. 8 is a side view of a prior art transport vehicle.
[Explanation of symbols]
1F, 1R: engine, 2F, 2R: transmission, 3F, 3R: propeller shaft, 4F: front axle, 4R: rear axle, 5F, 5R: wheels, 6: body frame, 7: hinge pin, 8: carrier, 9 ... Sub-frame, 10 ... buffer mechanism, 13F, 13R ... transfer.

Claims (4)

In transport vehicles,
A front axle (4F) provided at the front of the vehicle and fitted with wheels (5F);
A rear axle (4R) provided at a rear portion of the vehicle and equipped with wheels (5R);
A front engine (1F) having an output shaft directed forward between a front axle (4F) and a rear axle (4R);
A rear engine (1R) having an output shaft disposed rearward between a front axle (4F) and a rear axle (4R);
A front transmission (2F) connected to the front side of the front engine (1F) and transmitting the driving force of the front engine (1F) to the front axle (4F);
A rear transmission (2R) connected to the rear side of the rear engine (1R) and transmitting the driving force of the rear engine (1R) to the rear axle (4R);
The two engines (1F, 1R) and the two transmissions (2F, 2R) are fixedly mounted, and the front axle (4F) and the rear axle (4R) are swung about a vertical axis at a front end and a rear end, respectively. A transport vehicle comprising a body frame (6) movably supported. The transport vehicle according to claim 1,
A transport vehicle, wherein the two engines (1F, 1R) and the two transmissions (2F, 2R) are arranged in the center of the width of the vehicle body. In transport vehicles,
A front axle (4F) provided at the front of the vehicle and fitted with wheels (5F);
A rear axle (4R) provided at a rear portion of the vehicle and equipped with wheels (5R);
A front engine (1F) having an output shaft directed forward between a front axle (4F) and a rear axle (4R);
A rear engine (1R) having an output shaft disposed rearward between a front axle (4F) and a rear axle (4R);
A front transmission (2F) which is connected to a front side of the front engine (1F) via a transfer (13F) and transmits a driving force of the front engine (1F) to a front axle (4F);
A rear transmission (2R) that is connected to the rear side of the rear engine (1R) via a transfer (13R) and transmits the driving force of the rear engine (1R) to the rear axle (4R);
A vehicle body frame (6) in which the two engines (1F, 1R) are fixed at a predetermined distance in the left-right direction and overlap in the front-rear direction, and the two transmissions (2F, 2R) are fixed in the center of the vehicle width. ). The transport vehicle according to claim 3,
A transport vehicle characterized in that the front axle (4F) and the rear axle (4R) are supported by front and rear ends of a body frame (6), respectively, so as to be able to swing around a vertical axis.

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