JP2001191801A - Turret type carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turret type carrier using the high-pressure natural gas as a fuel in safety. SOLUTION: This turret type carrier is provided with gas containers 50 filled with natural gas and arranged under a deck 30, an outer pipe 60 for leading the natural gas from the gas containers 50 to a part near a power unit 10, an inner pipe 70 arranged inside of the power unit 10 and for supplying the natural gas from the outer pipe 60 to an engine 14, a flexible piping 71 provided at one part of the inner pipe 70 while corresponding to the tuning of the power unit 10, and a high-pressure reducing valve 80 for reducing the pressure of the natural gas from the gas containers 50. The high-pressure reducing valve 80 is arranged inside of the outer pipe 60, and a part of the outer pipe 60 over from the gas container 50 to the high-pressure reducing valve 80 is protected by cross members and side frames as a reinforcing member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turret type transportation vehicle, and more particularly to a turret type transportation vehicle using natural gas as a fuel.

[0002]

2. Description of the Related Art A turret type transport vehicle pivotally supports a power unit having an engine, a transmission device and a traveling device at a front portion of a frame through a revolving table, and has a carrier at a rear portion of the frame. For example, it is widely used for carrying luggage in fish markets, fruit and vegetable markets, and the like.

In the turret type transport vehicle, an engine using gasoline as a drive source is generally used in many cases, while an electric motor which does not emit exhaust gas is sometimes used. However, turret trucks that use electric motors are equipped with relatively heavy batteries, and the traveling distance that can be run on a single charge is short, and the operating time is limited. There is a concern about the increase.

On the other hand, recently, clean natural gas that is inexpensive, has excellent handling properties, emits little nitrogen oxides and carbon dioxide, and does not emit sulfide oxides has attracted attention as a fuel for engines.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a turret type transport vehicle which uses natural gas as a clean fuel which is inexpensive, easy to handle and has little effect on the environment. Is to do.

[0006]

According to a first aspect of the present invention, there is provided a turret type transport vehicle, wherein an external pipe for guiding natural gas in a gas container disposed outside the power unit to a position near the power unit is provided. A power unit that does not turn the high-pressure reducing valve in a turret-type carrier equipped with internal piping that is provided in the power unit and supplies natural gas from the external piping to the engine, and a high-pressure reducing valve that reduces the natural gas from the gas container. It is characterized in that it is provided in an external pipe outside of the above.

According to the first aspect of the present invention, a portion of the external piping from the gas container to the high-pressure reducing valve, in other words, a portion to which high-pressure natural gas is supplied, is disposed outside the non-swirl power unit, and The occurrence of bending and bending is avoided or suppressed, and breakage and the like are avoided, thereby ensuring safety.

According to a second aspect of the present invention, a power unit having an engine, a transmission device, and a traveling device is rotatably supported at a front portion of a frame via a revolving table. In addition, in a turret-type transport vehicle provided with a carrier at the rear of the underframe, a gas container filled with natural gas and disposed on the lower surface side of the carrier, and an outside for guiding the natural gas in the gas container to near the power unit A pipe, an internal pipe disposed in the power unit to supply natural gas from the external pipe to the engine, and at least a part of the internal pipe that bends and deforms in response to the turning of the power unit. A flexible pipe and a high-pressure reducing valve for reducing the pressure of the natural gas from the gas container, wherein the high-pressure reducing valve is disposed in the middle of the external pipe. , Characterized in that to protect the portion leading to the high pressure reducing valve from the gas container of the external pipe by strength members.

According to the second aspect of the present invention, since the high-pressure reducing valve is disposed in the middle of the external pipe, natural gas decompressed by the high-pressure reducing valve is supplied to the flexible pipe. It is not necessary to use a pipe having a higher pressure resistance than necessary, so that the degree of freedom of the material and the structure can be increased, sufficient flexibility can be exhibited, and the durability is improved.

[0010] In particular, the portion of the external piping from the gas container to the high-pressure reducing valve, in other words, the portion to which high-pressure natural gas is supplied is covered and protected by the strength member. Avoidance ensures safety.

According to a third aspect of the present invention, in the turret type transport vehicle according to the second aspect, the strength member is a cross member and a side frame constituting the underframe.

According to the third aspect of the present invention, since the existing cross member and the side frame constituting the frame are used as the strength members, it is not necessary to separately provide a dedicated strength member, thereby suppressing an increase in manufacturing cost. You.

According to a fourth aspect of the present invention, there is provided the turret type transport vehicle according to the second or third aspect, wherein a low pressure is provided downstream of the high pressure reducing valve to further reduce the natural gas pressure reduced by the high pressure reducing valve. A pressure reducing valve is provided.

According to the fourth aspect of the present invention, the natural gas can be adjusted to an appropriate pressure for the engine by the low-pressure reducing valve. The low-pressure reducing valve may be provided on either the external pipe or the internal pipe as long as it is on the downstream side of the high-pressure reducing valve. Further, the number of low-pressure reducing valves is not limited to one but may be two or more as necessary. It is also possible.

According to a fifth aspect of the present invention, in the turret type transport vehicle of the second to fourth aspects, the gas container is substantially moved in a front-rear direction with a container base valve provided in the gas container facing forward of the underframe. It is characterized in that it is arranged horizontally and a cover for covering at least the lower part of the gas container is provided.

According to the fifth aspect of the present invention, the total length of the external piping can be shortened, the safety can be improved, and the gas container can be mounted as compared with the case where the container main valve is arranged toward the rear side of the underframe. By arranging horizontally on the lower surface side of the carrier, the height of the carrier can be kept low. Further, by providing the cover, it is possible to protect the turret type carrier from rainwater and muddy water splashed up when the vehicle is running, and especially from salt water when used in a fish market or the like, and to suppress rusting.

According to a sixth aspect of the present invention, in the turret type transport vehicle according to the fifth aspect, the underframe includes a traveling protection member projecting downward from a lower end of the gas container in front of the gas container. It is characterized by having.

According to the sixth aspect of the present invention, the traveling protection member can prevent an obstacle from contacting the gas container during forward traveling, thereby protecting the gas container.

According to a seventh aspect of the present invention, there is provided the turret type transport vehicle according to the fifth or sixth aspect, wherein a section substantially Z-section for supporting a driver step near the front of the container base valve of the gas container.
A character-shaped cross member is provided with the upper flange forward, and an opening for operating the container base valve is provided on the floor behind the upper flange.

According to the seventh aspect of the present invention, the opening and closing of the container main valve of the gas container can be performed from the upper surface side of the floor through the opening, so that the opening and closing work is facilitated.

According to an eighth aspect of the present invention, in the turret type transport vehicle according to the seventh aspect, a flexible cover that can be opened and closed is provided at the opening.

According to the eighth aspect of the present invention, rainwater, muddy water, salt water and the like entering from the opening are suppressed, and rusting of the gas container and the like is suppressed. In particular, by forming a slit in the cover, the cover can be easily opened and closed, thereby improving workability.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a turret type transport vehicle according to the present invention will be described below with reference to FIGS.

FIGS. 1, 2 and 3 are a front view, a side view and a top view, respectively, showing an outline of a turret type carrier 1 according to the present embodiment. An underframe 20 and a carrier 30 are provided.

The power unit 10 includes an engine 14 using natural gas as fuel (see FIG. 8) and a transmission device (not shown).
And a traveling device 11. A circular frame 12 also serving as a handle and an accelerator operation unit 13 are disposed at an upper portion. The power unit 10 is
It is supported so as to be able to turn left and right about the axis C as the center of rotation.

As shown in FIG. 4 which is a side view and FIG. 5 which is a top view, the underframe 20 is a side frame 21 as a strength member extending in the front-rear direction along each of the right and left sides.
And a cross member 22 as a strength member provided between the left and right side frames 21.

As shown in FIG. 6, which is a view taken along the line XX of FIG. 4, the side frame 21 is formed of a channel steel having a U-shaped cross-section opening the opening 21a inward. On the other hand, the cross member 22 includes a vertical portion 22 extending in the left-right direction as shown in FIG.
a, an upper flange 22b bent so as to protrude forward from an upper end of the vertical portion 22a, and a vertical portion 22a
And a lower flange 22c bent rearward from the lower end of the lower end of the main body.

At the rear of the underframe 20, as shown in FIG.
A rear wheel 23 rotatably supported via bearings is provided, and the underframe 20 is mounted on a turntable 1 disposed at a front portion thereof.
7 (see FIG. 2), the power unit 10 is pivotably supported.

The loading platform 30 is, as shown in FIGS.
It is formed of a plate-like floor member fixed on the upper part of the sub-cross members 31, 32, 33, etc., which extends over the upper part of the left and right side frames 21 in the left-right direction.
Step 3 is provided in the latter half of the underframe 20, and the driver stands on the handrail 34 at the front half of the underframe 20.
5 is formed at a height slightly lower than the loading platform 30, and a parking brake 39 is provided at the step 35. In addition, as described later, the container main stopper 52 of the gas container 50 is operated using this step between the loading platform 30 and the step 35.

FIG. 8 is an explanatory diagram of a fuel system in the turret type transport vehicle 1.

The fuel system of the turret type transport vehicle 1 includes a gas container 50, an external pipe 60, an internal pipe 70, and a high-pressure reducing valve 80 as main components.

The gas container 50 has a cylindrical container main body 51 and a container main valve 52 provided at an end thereof. In the present embodiment, the container body 51 is filled with a natural gas at a relatively high pressure, for example, a pressure of about 20 MPa. A gas filling port 54 is connected to the base end side of the container main plug 52 via a check valve 53, and a drain 55 that is open to the atmosphere is connected.

The external pipe 60 is a pipe for guiding the natural gas in the gas container 50 to the vicinity of the power unit 10, and is shown in FIG.
Here, the pipe extends from the container main valve 52 of the gas container 50 to the power unit 10 indicated by the boundary S. External piping 6
0, a main stop valve 61 and a high-pressure reducing valve 80 are arranged in order from the upstream along the flow direction of the natural gas, and the external pipe 60 is connected to the high-pressure pipe 60a on the upstream side with the high-pressure valve pressure valve 80 as a boundary. And the downstream side thereof becomes the medium pressure pipe 60b. Between the main stop valve 61 and the high-pressure reducing valve 80, a pressure sensor 63 for detecting the pressure in the high-pressure pipe 60a and an indicator 62 are interposed.

The internal piping 70 extends from the boundary S to the engine 14
And is disposed in the power unit 10. A flexible pipe 71 having flexibility is provided at the most upstream side of the inner pipe 70, that is, at a connection portion with the most downstream side of the outer pipe 60, and a low pressure cutoff valve 72 and a low pressure reducing valve are provided at a downstream side thereof. 81 are provided. Internal piping 7
0 is a medium pressure pipe 70a from the boundary S to the low pressure reducing valve 81 including the flexible pipe 71, and the low pressure reducing valve 81
To the mixer 15 on the upstream side of the engine 14
0b. An intake negative pressure pipe 73 extending from the low pressure reducing valve 81 is connected between the engine 14 and the mixer 15.

The natural gas supplied from the gas container 50 via the high-pressure pipe 60a is reduced from about 20 MPa to about 0.4 MPa by a high-pressure reducing valve 80 provided in the middle of the external pipe 60.
The pressure is reduced to about 1 MPa and supplied to the medium pressure pipe 60b.
The low-pressure reducing valve 81 reduces the pressure of the natural gas of about 0.4 to 1 MPa supplied through the medium-pressure pipe 60b, the flexible pipe 71, and the like to substantially the atmospheric pressure, and supplies the natural gas to the engine 14.

The main stop valve 6 provided in the external piping 60
1 and the low pressure cutoff valve 72 are connected to the natural gas cut switch 9.
1. Battery 93 via ignition switch 92
And is controlled to be opened and closed by an ignition switch 92 and a natural gas cut switch 91.

Next, the positional relationship between the main members constituting the fuel system and the power unit 10, the underframe 20, and the like will be described.

As shown in FIGS. 4 and 6, the gas container 50 is provided with two supporting members 24 having a supporting concave portion 24a having an L-shaped cross section fixed to the side frame 21 and a front end side and a rear end of the container main body 51. Side and bottom are supported from below.
In the present embodiment, the two gas containers 50 are supported substantially horizontally along the front and rear with the container main plug 52 side facing the underframe front side, and are arranged so as to be parallel to each other. Further, the container main plug 52 is close to the rear of the vertical portion 22 a of the cross member 22. A cover 25 having an appropriate position, size, and number of water drain holes (not shown) is attached below, beside, and behind the gas container 50. Rainwater, muddy water,
Salt water and the like are prevented from adhering to the gas container 50 and the main plug 52 of the container, thereby protecting the gas container 50 from rusting.

In front of the gas container 50, as shown in FIG.
As shown in FIGS. 9 and 7, a partition plate 37 having a notch 37a and having an L-shaped cross section is provided in the opening 36.
As shown in FIGS. 4 and 3, the vertical portion 37 of the partition plate 37 is provided.
A flexible waterproof cover 38 having a slit 38a and disposed so as to hang down from b is provided. The opening 36 has a vertical portion and a horizontal portion. The vertical portion faces the notch 37a, and the horizontal portion corresponds to immediately behind the upper flange 22b of the cross member 22. From above the step 35
The opening and closing operation of the container main stopper 52 is performed.

Further, the lower portion of the cross member 22 projects further downward than the lower end of the gas container 50 to prevent an obstacle or the like from contacting the gas container 50 during traveling, thereby protecting the gas container 50. Running protection member 26 is provided.

The high-pressure pipe 60a of the external pipe 60
4 and 5, the high-pressure pipe 60a extends from the container base valve 52 of the gas container 50 to a position above the lower flange 22c of the cross member 22 and then crosses over. After being arranged at the center of the vertical portion 22a of the member 22 and at the position corresponding to the center of the lower flange 22c, extending to the left along the cross member 22 and reaching the left side frame 21, It is bent forward, disposed inside the side frame 21, and extended forward.

At a position substantially corresponding to the rear end of the power unit 10, the high-pressure reducing valve 80 is also disposed in the side frame 21. The intermediate-pressure pipe 60b downstream of the high-pressure reducing valve 80 It is extended upward from the pressure reducing valve 80 and is erected at the step 35, and the terminal end portion 60c reaches the upper part of the power unit 10 as shown in FIG. The upright portion is covered by a cover 35a that is also upright at the step 35.

The internal piping 70 provided inside the power unit 10 is a top view of the power unit 10 shown in FIG.
0, as shown in FIG. 11 which is also a left side view, a flexible pipe 71
The central part 71a is fixed to the fixing member 16 on the upper part of the power unit 10, and the start part 71b is connected to the terminal part 6 of the medium pressure pipe 60b of the external pipe 60.
0c. The end 71c of the flexible pipe 71 is connected to a low-pressure reducing valve 81 via another pipe 74, and the low-pressure reducing valve 81 is further connected to a low-pressure pipe 70b.
(See FIG. 8) and the like.

As described above, in the present invention, the underframe 20
On the other hand, since the power unit 10 is configured to be rotatable, as a measure for supplying natural gas from outside the power unit 10 to the inside of the power unit 10, a part of the internal pipe 70 in the power unit 10, that is, the external pipe 6
A flexible pipe 71 is provided over a predetermined length from a connection portion with the zero end portion. This flexible piping 7
1, the position of the starting end 71b is fixed,
Since the position of the terminal end portion 71c changes with the turning of the power unit 10, the degree of curvature of the S-shaped curved portion appropriately changes according to the turning angle, so that the flexible pipe 71 is required to have good flexibility. You.

Therefore, as one of the features of the present invention, as described above, the high-pressure reducing valve 80 is disposed upstream of the flexible pipe 71, and the pressure of the natural gas flowing through the flexible pipe 71 is reduced. Has been reduced to a pressure that can withstand it sufficiently. In the present embodiment, as described above, the pressure is reduced, for example, from 20 MPa to 0.4 to 1 MPa.

Another feature is that a high-pressure natural gas of 20 MPa flows through the pipe from the gas container 50 to the high-pressure reducing valve 80, that is, the high-pressure pipe 60a of the external pipe 60. The high-pressure pipe 60a is covered and protected by the cross member 22 and the side frame 21 as the strength members, and even when the power unit 10 is turned, the bending and the bending deformation are avoided or suppressed, so that the safety is improved.

In the above embodiment, a low-pressure reducing valve 81 is provided in addition to the high-pressure reducing valve 80. However, an engine having a structure in which a gas having a reduced pressure can be directly used as fuel only by the high-pressure reducing valve 80 is used. In the above, the low pressure reducing valve 81 is not always necessary. Conversely, if a further stepwise reduction in pressure is required, a low-pressure reducing valve may be further added as necessary.

In the above description, the case where the gas used as the fuel for the turret type transport vehicle 1 is natural gas has been described. However, the present invention is not limited to natural gas and the case where the same high pressure gas is used. Can also be applied.

When a mechanism for stopping the engine 14 in conjunction with the parking brake 39 is incorporated in the turret type transport vehicle 1, the amount of exhaust gas is reduced, and the turret type transporter used in a wholesale market or the like is used. It is possible to provide a more suitable structure as a car.

In general, when the turret type transport vehicle 1 is used to transport luggage on the premises in a wholesale market or the like, the engine 14 is stopped by turning off the ignition switch 92 when the vehicle is stopped for a long time. When the vehicle is stopped for a short period of time, such as during loading / unloading work, the work is usually performed while the engine 14 is running, and there is a concern that the exhaust gas may be released and affect the indoor environment.

Therefore, when the vehicle is stopped, the parking brake 39 is stopped.
Is operated, the engine 14 is stopped in conjunction with this. As a specific example, a natural gas cut switch 91 linked to the parking brake 39 is attached, and the main stop valve 61 is electrically operated to cut off the supply of the natural gas. When the engine 14 is restarted, by turning the ignition switch 92 to the start position, the stop of the engine 14 and the start of the starter motor (not shown) are simultaneously performed to start the engine 14. The circuit is switched by a selection switch (not shown), and the ignition switch 92 is operated to start the operation.

With this configuration, the engine 14 can be stopped without operating the ignition switch 92 when the turret type transport vehicle 1 is stopped, and unnecessary emission of exhaust gas at the time of stop can be prevented. In addition, restarting has the effect that the engine 14 can be restarted by turning the ignition switch 92 to the start position in the same manner as a normal start operation.

[0053]

According to the turret type transport vehicle of the present invention described above, by disposing the high-pressure reducing valve in the external pipe, natural gas reduced in pressure by the high-pressure reducing valve can be supplied to the flexible pipe. Since it is possible, the flexible pipe does not need to be configured to withstand a high pressure more than necessary, sufficient flexibility can be exhibited, and the flexibility and safety of the material and structure can be improved. Also,
The part of the external piping from the gas container to the high pressure reducing valve,
That is, since the portion where the high-pressure natural gas flows is protected by the strength member, safety is ensured, and the high-pressure natural gas can be used safely as fuel for the turret type transport vehicle.

[Brief description of the drawings]

FIG. 1 is a front view showing an outline of an embodiment of a turret type transport vehicle according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a side view showing a configuration of an underframe and the like.

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a view taken along line XX of FIG. 4;

FIG. 7 is a view taken along line YY of FIG. 5;

FIG. 8 is an explanatory diagram of a fuel system.

FIG. 9 is a perspective view showing a partition plate.

FIG. 10 is a top view schematically showing a power unit.

FIG. 11 is a side view of FIG. 10;

[Explanation of symbols]

 Reference Signs List 1 turret type carrier 10 power unit 11 traveling device 14 engine 17 turning table 20 underframe 21 side frame (strength member) 22 cross member (strength member) 25 cover 26 traveling protection member 30 carrier 36 opening 38 waterproof cover (cover) 38a Slit 50 Gas container 52 Container base valve 60 External piping 60a High pressure piping 60b Medium pressure piping 70 Internal piping 70a Medium pressure piping 70b Low pressure piping 71 Flexible piping 80 High pressure reducing valve 81 Low pressure reducing valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Akagi 1-7-2 Nishishinjuku, Shinjuku-ku, Tokyo Inside Fuji Heavy Industries, Ltd. (72) Inventor Hirofumi Imai 313-1 Takada, Odawara City, Kanagawa Prefecture Mikuni Corporation F-term in the pit (reference) 3D038 CA17 CB04 CC18 CD12

Claims (8)

[Claims] 1. An external pipe that guides natural gas in a gas container disposed outside the power unit to a position near the power unit, an internal pipe that is disposed inside the power unit and supplies natural gas from the external pipe to the engine, A turret type carrier equipped with a high-pressure reducing valve for reducing the pressure of natural gas from a container, wherein the high-pressure reducing valve is provided on an external pipe outside a power unit that does not turn. 2. A turret type transport vehicle having a power unit having an engine, a transmission device, and a traveling device rotatably supported at a front portion of an underframe via a swivel table, and having a carrier at a rear portion of the underframe. A gas container filled with natural gas and disposed on the lower surface side of the loading platform; an external pipe for guiding the natural gas in the gas container to a position near the power unit; and a natural pipe disposed in the power unit and supplied from the external pipe. An internal pipe for supplying gas to the engine, a flexible pipe provided on at least a part of the internal pipe that bends and deforms in response to the turning of the power unit, and a high-pressure reducing valve for reducing natural gas from the gas container. The high-pressure reducing valve is disposed in the middle of the external pipe, and a portion of the external pipe from the gas container to the high-pressure reducing valve. A turret type transport vehicle characterized in that parts are protected by strength members. 3. The turret type transport vehicle according to claim 2, wherein the strength member is a cross member and a side frame constituting the underframe. 4. The turret-type carrier according to claim 2, wherein a low-pressure reducing valve for further reducing the natural gas depressurized by the high-pressure reducing valve is provided downstream of the high-pressure reducing valve. car. 5. The gas container according to claim 1, wherein a container main valve provided in the gas container is disposed substantially horizontally in a front-rear direction toward a front of the underframe, and a cover for covering at least a lower portion of the gas container is provided. The turret type transport vehicle according to claim 2, wherein: 6. The turret type transport vehicle according to claim 5, wherein the underframe includes a traveling protection member projecting below a lower end of the gas container in front of the gas container. . 7. A cross member having a substantially Z-shaped cross section for supporting a driver's step is provided near the front of a container main valve of the gas container with an upper flange forward, and the cross member is provided on the floor behind the upper flange. The turret type transport vehicle according to claim 5, wherein an opening for operating the container base valve is provided. 8. The turret type transport vehicle according to claim 7, wherein a flexible cover that can be opened and closed is provided in the opening.