JP4624445B2 - Tank semi-trailer - Google Patents

Description

  The present invention relates to a tank semi-trailer, and more particularly to a tank semi-trailer that can reduce the center of gravity and increase the size of a tank.

Conventionally, as a semi-trailer to be pulled by a tractor, a tank semi-trailer equipped with a tank for storing a transported item (such as LNG) is known (for example, Patent Document 1). This type of tank semi-trailer has a monocoque structure that secures the strength as a semi-trailer by the strength of the tank itself and a frame that supports the tank, and combines the strength of the frame itself or the strength of the frame and the strength of the tank as a semi-trailer. The frame structure is roughly divided into two types, that is, a frame structure that ensures the strength of the frame.
JP 2004-83034 A

  By the way, such a tank semi-trailer is strongly required to increase the size of the tank in order to improve the transportation efficiency. However, since the tank semi-trailer having the frame structure described above is supported by the frame, there is a problem that when the tank is enlarged, the height of the center of gravity increases accordingly. As a result, the running stability is not only impaired, but the safety standard (maximum stable inclination angle) of the Road Transport Vehicle Law may not be satisfied.

  On the other hand, in the tank semitrailer having the monocoque structure described above, the height of the center of gravity can be kept lower than in the case of the frame structure, but from the viewpoint that a minimum ground clearance must be ensured, enlargement of the tank is limited. There was a problem.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a tank semi-trailer capable of reducing the center of gravity and increasing the size of the tank.

In order to achieve this object, a tank semi-trailer according to claim 1 includes a tank that accommodates a transported article, a frame that supports the tank, and a wheel that supports the frame, and the frame is connected to the tractor. The frame is supported by the tractor in a state of supporting the front end side of the tank and being connected to the tractor, and the rear end side of the tank. And a low floor portion positioned between the wheel support portion and the tractor support portion, the low floor portion including the tractor support portion and the wheel support portion. It is formed to be recessed stepwise with respect to the lower floor of the center of gravity height, constituting lower the center of gravity height of and the wheel support portion lower than the height of the center of gravity of the tractor supporting portion Is, the tank comprises an inner tank for containing the transported article, the outer tub for covering the outer periphery of the inner tank, and a support member interposed between the outer tank and the inner tank, the support member The inner tank is supported by the outer tank via a support member, and the support member is disposed at a position corresponding to the tractor support part and the wheel support part in a state where the tank is supported by the frame. ing.

Tank semitrailer of claim 2, in tank semitrailer of claim 1 Symbol placement, the tank has a cylindrical shape, the frame, the pair extending along the longitudinal direction of the tank so as to face each other It is formed by a beam member, and is configured to support the outer peripheral surface of the tank by the pair of beam members, and the opposing interval between the pair of beam members is the same as the opposing interval in the tractor support portion. It is comprised wider than the said opposing space | interval in a part.

Tank semitrailer of claim 3, wherein, in the tank semitrailer according to claim 1 or 2, height of the center of gravity of the wheel support portion is configured lower than the height of the center of gravity of the tractor support.

  According to the tank semi-trailer according to claim 1, the frame includes a tractor support portion that supports the front end side of the tank and a wheel support portion that supports the rear end side of the tank, and the tractor support portion is supported by the tractor. At the same time, the wheel support portion is supported by the wheel. Further, the frame includes a low floor portion positioned between the tractor support portion and the wheel support portion, and the center of gravity height of the low floor portion is lower than the center of gravity height of the tractor support portion and higher than the center of gravity height of the wheel support portion. It is configured low.

  Here, the tractor support part is a part supported by the tractor, and since the ground height (height from the ground) to be secured is set in advance according to the specifications of the tractor, the center of gravity of the tractor support part is lowered. Has its limits. Further, the wheel support part is also a part supported by the wheel, and since the ground clearance to be secured is set in advance, there is a limit in reducing the center of gravity of the wheel support part.

  On the other hand, according to the present invention, a low floor portion is provided between the tractor support portion and the wheel support portion, the center of gravity height of the low floor portion is lower than the center of gravity height of the tractor support portion, and the wheel support portion. Since the center of gravity is lower than the center of gravity, it is possible to lower the center of gravity of the frame by lowering the center of gravity of the low floor portion. Accordingly, there is an effect that the center of gravity of the tank can be lowered and the center of gravity of the tank semi-trailer can be lowered. As a result, there is a margin with respect to the safety standard (maximum stable inclination angle) of the Road Transport Vehicle Law, and there is an effect that the tank can be increased in size accordingly.

In addition, since the low floor part is formed in a stepped manner with respect to the tractor support part and the wheel support part, the center of gravity of the low floor part is eccentric to the low center of gravity side, and the frame is reasonably lowered. There is an effect that the center of gravity can be achieved.

  In addition, by lowering the center of gravity of the frame, it is possible to lower the center of gravity of the tank semi-trailer as a whole, and it is possible to increase the size of the tank accordingly.

  Furthermore, according to the present invention, since the low floor portion is formed in a stepped manner with respect to the tractor support portion and the wheel support portion, the tank is supported by the tractor support portion and the wheel support portion, A space can be formed between the section and the tank. Thus, for example, a space for mounting various equipment such as a tool box, a fire extinguisher, or a heat exchanger for evaporating the liquid transported material stored in the tank by heat exchange with the outside and taking it out of the tank. There is an effect that can be secured.

The tank also includes an inner tank that accommodates a transported article, an outer tank that covers the outer periphery of the inner tank, and a support member that is interposed between the outer tank and the inner tank. The inner tank is supported by the outer tank, and the support member is disposed at a position corresponding to the tractor support part and the wheel support part in a state where the tank is supported by the frame. It becomes a skeleton for supporting the tank, and there is an effect that the supporting rigidity of the tank can be secured.

  Thereby, even if the support area of the tank by the frame is reduced, the lower floor part is formed in a stepped shape with respect to the tractor support part and the wheel support part, thereby suppressing a decrease in the support rigidity of the tank. There is an effect that can be.

According to a tank semi-trailer according to claim 2, in addition to the effects of tank semitrailer of claim 1 Symbol placement, the tank is formed into a cylindrical shape, the frame is extended along the longitudinal direction of the tank facing each other The pair of beam members are configured to support the outer peripheral surface of the tank, and the facing distance between the pair of beam members is equal to the distance between the tractor support portion and the wheel support portion. Since it is configured wider than the facing distance, in the tractor support portion, the tank can enter deeper between the pair of beam members than the wheel support portion, and the tank can be supported lower by that amount.

  Here, the tractor support part is a part supported by the tractor, and since the ground height (height from the ground) to be secured is set in advance according to the specifications of the tractor, the center of gravity of the tractor support part is lowered. Has its limits. In contrast, by supporting the tank low, there is an effect that the center of gravity of the tank can be lowered and the center of gravity of the tank semi-trailer can be lowered.

According to a tank semi-trailer according to claim 3, in addition to the effects of tank semitrailer according to claim 1 or 2, height of the center of gravity of the wheel support portion, which is configured lower than the height of the center of gravity of the tractor support, The center of gravity of the frame can be lowered by lowering the center of gravity of the wheel support portion.

  Here, the tractor support part is a part supported by the tractor, and since the ground height to be secured (height from the ground) is set in advance based on the specifications of the tractor, the center of gravity of the tractor support part is lowered. There is a limit to plan. On the other hand, the wheel support part is a part supported by the wheel, and it is not necessary to satisfy the ground height that should be ensured in the tractor support part. Therefore, the ground height that should be ensured is generally lower than that of the tractor support part. . Therefore, by lowering the center of gravity of the wheel support portion, there is an effect that the center of gravity of the tank semi-trailer can be lowered by lowering the center of gravity of the frame.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. First, a schematic configuration of a tank semi-trailer 1 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a side view of a tank semi-trailer 1 according to an embodiment of the present invention. In FIG. 1, a state where the tank semi-trailer 1 is coupled to the tractor 100 is illustrated.

  The tank semi-trailer 1 is a semi-trailer that is pulled by the tractor 100 and transports a transported object. As shown in FIG. 1, a tank 10 that stores a transported object (such as LNG), a frame 20 that supports the tank 10, Wheels 30 that support the frame 20 are mainly provided, and the frame 20 is configured to be connected to the tractor 100 via the connecting device 101. Further, the tank semi-trailer 1 includes a low floor portion 23 in the frame 20, and the frame 20 is lowered by the low floor portion 23 so that the center of gravity of the tank semi-trailer 1 as a whole can be lowered. Yes.

  Next, the detailed configuration of each unit will be described with reference to FIG. FIG. 2A is a side view of the tank semi-trailer 1, and FIG. 2B is a top view of the tank semi-trailer 1. In FIG. 2B, the tank 10 is indicated by a two-dot chain line for easy understanding of the drawing. 2C is a cross-sectional view of the tank semi-trailer 1 taken along the line IIc-IIc in FIG. 2A, and FIG. 2D is a tank semi-trailer 1 taken along the line IId-IId in FIG. FIG.

  As shown in FIG. 2, the tank 10 includes a substantially cylindrical inner tank 11 that accommodates a transported article, and a substantially cylindrical outer tank 12 that covers the outer periphery of the inner tank 11, and has a so-called two-layer structure. Has been. A plurality of support members 13 are interposed between the inner tank 11 and the outer tank 12, and the inner tank 11 is supported by the outer tank 12 by the plurality of support members 13.

  The support member 13 is formed in an annular shape along the outer peripheral surface of the inner tank 11 and the inner peripheral surface of the outer tank 12, and the front end side (left side in FIG. 2A) and the rear end side (FIG. 2) of the tank 10. In (a) right side, it is arrange | positioned in the position corresponding to the tractor support part 21 and the wheel support part 22 of the flame | frame 20 mentioned later.

  The wheel 30 functions as a traveling device of the tank semi-trailer 1 and supports the frame 20 via a suspension device (not shown). Note that the tank semi-trailer 1 in the present embodiment is configured to include a total of eight wheels 30 as shown in FIG. However, the number of wheels 30 is not necessarily limited to this, and is preferably set based on the relationship between the maximum load capacity and the axial load.

  The frame 20 forms a skeleton of the tank semi-trailer 1, and includes a tractor support portion 21 that supports the front end side (left side in FIG. 2A) of the tank 10 and the rear end side (right side in FIG. 2A) of the tank 10. ), And a low floor portion 23 positioned between the tractor support portion 21 and the wheel support portion 22.

  In addition, the tank semi-trailer 1 in the present embodiment ensures the strength as a semi-trailer by the strength of the frame 20 itself. However, the strength of the semi-trailer may be secured by combining the strength of the tank 10 and the strength of the frame 20.

  The tractor support portion 21 is a portion that is supported by the tractor 100 in a state of being connected to the tractor 100 (see FIG. 1). As shown in FIG. 2A, the center of gravity height (from the ground G to the tractor support portion 21 is The height to the center of gravity Ca) is configured to be Ha. The wheel support part 22 is a part supported by the wheel 30, and as shown in FIG. 2A, the height of the center of gravity (the height from the ground G to the center of gravity Cb of the wheel support part 22) becomes Hb. It is configured.

  The height of the center of gravity of the tractor support portion 21 and the wheel support portion 22 is configured such that the height of the center of gravity of the wheel support portion 22 is lower than the height of the center of gravity of the tractor support portion 21 (Hb <Ha). The center of gravity is lower than 21.

  Here, the tractor support part 21 is a part supported by the tractor 100, and since the ground height (height from the ground G) to be secured is set in advance based on the specifications of the tractor 100, the tractor support part There is a limit to lowering the center of gravity of 21. On the other hand, the wheel support portion 22 is a portion supported by the wheel 30 and does not have to satisfy the ground clearance that should be ensured in the tractor support portion 21, so in general (for example, only by the connecting device 101) The ground clearance to be secured is lower than that of the support portion 21. Therefore, by lowering the center of gravity of the wheel support portion 22, it is possible to lower the center of gravity of the frame 20 and to lower the center of gravity of the tank semi-trailer 1 as a whole.

  Further, the tractor support portion 21 and the wheel support portion 22 are configured such that the total height of the wheel support portion 22 (height from the ground G to the top of the wheel support portion 22) is the total height of the tractor support portion 21 (from the ground G to the tractor support portion. 21 (height up to the top of 21). Therefore, as shown in FIG. 2A, the wheel support portion 22 can support the tank 10 lower than the tractor support portion 21. Thereby, the center of gravity of the tank 10 can be lowered, and the center of gravity of the tank semi-trailer 1 as a whole can be lowered.

  The low floor portion 23 is a portion that is not supported by either the tractor 100 or the wheel 30, and as shown in FIG. 2A, is stepped toward the ground G side with respect to the tractor support portion 21 and the wheel support portion 22. In addition to being formed to be recessed, the height of the center of gravity (the height from the ground G to the center of gravity Cc of the low floor portion 23) is configured to be Hc.

  The center of gravity of the low floor 23 is lower than the center of gravity of the tractor support 21 and lower than the center of gravity of the wheel support 22 (Hc <Hb <Ha). And the center of gravity is made lower than both of the wheel support portion 22.

  As shown in FIG. 2B, the frame 20 includes a pair of beam members 20a facing each other and extending in the front-rear direction of the tank 10 (the left-right direction in FIG. 2B), and the pair of beams. The plurality of beam members 20b connecting the members 20a are formed in a ladder shape, and the tank 10 is mounted between the pair of beam members 20a, so that the outer peripheral surface of the tank 10 is supported by the pair of beam members 20a. It is configured as follows.

  Further, the facing distance between the pair of beam members 20a is such that the facing distance La in the tractor support portion 21 is wider than the facing distance Lb in the wheel support portion 22 (La> Lb). As a result, as shown in FIGS. 2C and 2D, in the tractor support portion 21, the tank 10 sinks deeper between the pair of beam members 20a than the wheel support portion 22, and the tank is correspondingly reduced. 10 can be supported low.

  Here, the tractor support part 21 is a part supported by the tractor 100, and the ground height to be secured is set in advance based on the specifications of the tractor 100, so that the tractor support part 21 has a low center of gravity. There are limits. On the other hand, by supporting the tank 10 low, the center of gravity of the tank 10 can be lowered and the center of gravity of the tank semi-trailer 1 as a whole can be lowered.

  The frame 20 configured as described above is formed in such a manner that the low floor portion 23 is formed in a stepped shape toward the ground G side with respect to the tractor support portion 21 and the wheel support portion 22, and is shown in FIG. Thus, the tank 10 is supported by the tractor support part 21 and the wheel support part 22 without supporting the tank 10 at the low floor part 23. As a result, a space S is formed between the low floor portion 23 and the tank 10.

  As described above, when the tank 10 is not supported by the low floor portion 23 and is supported by the tractor support portion 21 and the wheel support portion 22, the support area of the tank 10 by the frame 20 is reduced. This leads to a decrease in support rigidity. In contrast, in the tank semi-trailer 1 according to the present embodiment, as described above, the support member 13 of the tank 10 is disposed at a position corresponding to the tractor support portion 21 and the wheel support portion 22. Becomes a skeleton for supporting the tank 10, and the supporting rigidity of the tank 10 can be secured. Thereby, even if the support area of the tank 10 by the flame | frame 20 reduces, the fall of the support rigidity of the tank 10 can be suppressed.

  The space S is a space formed between the low floor portion 23 and the tank 10 and between the tractor support portion 21 and the wheel support portion 22, and is formed in the width direction of the frame 20 (FIG. 2A). It is open in the direction of the paper. Thereby, for example, a tool box or a fire extinguisher (both not shown), or a heat exchanger 40 for vaporizing the liquid transported material stored in the tank 10 by heat exchange with the outside and taking it out of the tank 10. It is possible to secure a space for mounting various equipment such as.

  Here, even when the space S is not provided between the low floor portion 23 and the tank 10, various equipment (such as the heat exchanger 40) is mounted in a gap formed between the pair of beam members 20a. It is possible. However, in this case, a sufficient space cannot be secured, and the equipment needs to be divided or downsized. In addition, the beam member 20a is obstructed, the heat effect efficiency of the heat exchanger 40 is lowered, and handling and maintenance of the mounted equipment becomes inconvenient.

  On the other hand, since the space S is open in the width direction of the frame 20, various kinds of equipment can be mounted as an integrated object without being limited by the space. Further, since the frame 20 is opened in the width direction, the heat exchange efficiency of the heat exchanger 40 can be improved, and the mounted equipment can be easily handled and maintained.

  As described above, according to the tank semi-trailer 1 of the present embodiment, the frame 20 includes the low floor portion 23 positioned between the tractor support portion 21 and the wheel support portion 22, Since the center of gravity height Hc is lower than the center of gravity height Ha of the tractor support portion 21 and lower than the center of gravity height Hb of the wheel support portion 22, the center of gravity of the frame 20 is lowered by lowering the center of gravity of the low floor portion 23. Can be planned. Thereby, the center of gravity of the frame 20 can be lowered, and the center of gravity of the tank semi-trailer 1 as a whole can be lowered. As a result, there is a margin with respect to the safety standard (maximum stable inclination angle) of the Road Transport Vehicle Law, and the tank 10 can be enlarged accordingly.

  Further, the frame 20 is formed such that the low floor portion 23 is recessed stepwise with respect to the tractor support portion 21 and the wheel support portion 22, so that the center of gravity of the low floor portion 23 is eccentric to the low center of gravity side. In particular, the center of gravity of the frame 20 can be lowered.

  Further, by rationally lowering the center of gravity of the frame 20, the center of gravity of the tank semi-trailer 1 as a whole can be lowered, and the size of the tank 10 can be increased accordingly.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  For example, in the above-described embodiment, the case where the tank 10 is configured in a two-layer structure including the inner tank 11 and the outer tank 12 has been described. However, the present invention is not necessarily limited thereto, and may be configured as a single-layer structure. good.

  In the above embodiment, the case where the tank 10 (the inner tank 11 and the outer tank 12) is formed in a substantially cylindrical shape has been described. However, the present invention is not necessarily limited to this. For example, the tank 10 is connected to the front end of the tank 10. A substantially cylindrical small-diameter portion positioned on each of the side and rear end sides, and a substantially cylindrical large-diameter portion positioned between the small-diameter portions and having a larger diameter than the small-diameter portion. The large diameter portion may be arranged on the low floor portion 23 of the frame 20 and the small diameter portion may be supported by the tractor support portion 21 and the wheel support portion 22 of the frame 20. In this case, since the low floor portion 23 is formed to be depressed in a stepped manner with respect to the tractor support portion 21 and the wheel support portion 22, while avoiding interference between the tank 10 and the frame 20, The size of the tank 10 can be increased by that amount.

It is a side view of the tank semi-trailer in one embodiment of the present invention. (A) is a side view of a tank semitrailer, (b) is a top view of a tank semitrailer. (C) is a cross-sectional view of the tank semi-trailer along the line IIc-IIc in FIG. 2 (a), and (d) is a cross-sectional view of the tank semi-trailer along the line IId-IId in FIG. 2 (a).

DESCRIPTION OF SYMBOLS 1 Tank semi-trailer 10 Tank 11 Inner tank 12 Outer tank 13 Support member 20 Frame 20a Beam member 21 Tractor support part 22 Wheel support part 23 Low floor part 30 Wheel 100 Tractor Ha Tractor support part center of gravity Hb Wheel support part center of gravity Hc Center of gravity height S of low floor

Claims (3)

In a tank semi-trailer that includes a tank that accommodates a conveyed item, a frame that supports the tank, and a wheel that supports the frame, and the frame is connected to the tractor and pulled by the tractor.
The frame is
A tractor support part that supports the front end side of the tank and is supported by the tractor in a state of being connected to the tractor;
A wheel support that supports the rear end of the tank and is supported by the wheel;
A low floor portion located between the wheel support portion and the tractor support portion,
The low floor portion is formed in a stepped recess with respect to the tractor support portion and the wheel support portion,
The low floor portion of the height of the center of gravity is made lower than the height of the center of gravity of and the wheel support portion lower than the height of the center of gravity of the tractor support,
The tank includes an inner tank that accommodates the transported object, an outer tank that covers the outer periphery of the inner tank, and a support member that is interposed between the outer tank and the inner tank, and the support member is interposed therebetween. The inner tank is configured to be supported by the outer tank,
The tank semi-trailer , wherein the support member is disposed at a position corresponding to the tractor support portion and the wheel support portion in a state where the tank is supported by the frame . The tank is formed in a cylindrical shape,
The frame is formed by a pair of beam members extending in the front-rear direction of the tank so as to face each other, and is configured to support the outer peripheral surface of the tank by the pair of beam members,
The opposing distance between the pair of beam members are tank semitrailer according to claim 1, characterized by being constituted wider than the facing distance the facing distance in the tractor supporting portion in the wheel support portion. 3. The tank semi-trailer according to claim 1, wherein a height of the center of gravity of the wheel support portion is configured to be lower than a height of the center of gravity of the tractor support portion.

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