JP2013039901A - Fuel tank system for truck, truck and main fuel tank for track - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel tank system for a truck in which a support system for supporting a float hardly gets damaged.SOLUTION: The fuel tank system for a truck includes: a main fuel tank 200 having a tank chamber for storing fuel; a sub fuel tank 300 disposed at a level higher than the main fuel tank 200, and having a tank chamber for storing fuel; and a supply conduit 400 for communicating the tank chamber of the main fuel tank with the tank chamber of the sub fuel tank. The fuel tank system is provided with: a float vertically movable according to an amount of fuel stored in the tank chamber of the main fuel tank; a support mechanism for supporting the float to make the trajectory of the vertical movement of the float constant; a movement restriction means for restricting the movement of the float; and an open/close valve for controlling the start and end of fuel injection through the supply conduit according to the altitude of the float.

Description

  The present invention relates to a fuel tank system for a cargo vehicle, a cargo vehicle, and a main fuel tank for a cargo vehicle, and the present invention is suitable for a large-sized cargo vehicle such as a truck, particularly a towing vehicle for towing a trailer type vehicle.

  This type of fuel tank system for trucks (hereinafter sometimes simply referred to as a fuel tank system) includes a main fuel tank that supplies fuel to the engine of a truck, and a sub fuel disposed above the main fuel tank. A tank and a supply pipe that communicates the main fuel tank and the sub fuel tank have been proposed (see Japanese Utility Model Publication No. 6-14066).

  The fuel tank system described in this publication has a float type oil amount detector that detects the amount of fuel in the main fuel tank. The float type oil amount detector includes a float that moves up and down according to the amount of fuel in the main fuel tank, and a support mechanism that is connected to the float to support the float that moves up and down and is swingable. have. Further, an electromagnetic valve is provided in the supply pipe line, and this electromagnetic valve is configured to be opened and closed by a detection signal of a float type oil amount detector.

  However, in the fuel tank system described in the above publication, the support mechanism may be damaged due to, for example, undulation of the liquid level of the fuel in the main fuel tank during traveling. In other words, the fuel level of the fuel in the main fuel tank undulates due to the traveling of the truck, and the float moves up and down due to the undulation, and the force acts in the horizontal direction from the undulating fuel to the float. The support mechanism may be damaged by the force. For this reason, the fuel tank system described in the above publication has not actually been adopted.

  Moreover, in an actual freight vehicle, there is a problem of a tank installation space, and a space for installing a sub fuel tank of the fuel tank system described in the above publication is a problem. In particular, since the sub fuel tank described in the above publication has a tank shape that is long in the front-rear direction similar to the main fuel tank, the problem of the installation space is even more so. Moreover, in the case of a towed vehicle that pulls a trailer-type vehicle, no object can be installed in the rotation area of the trailer-type vehicle, and a place for installing a sub fuel tank that is long in the front-rear direction as described in the above publication is secured. Is extremely difficult.

Japanese Utility Model Publication No. 6-14066

  The present invention has been made in view of the above-described conventional problems, and a first object of the present invention is to provide a fuel tank system for a lorry vehicle, a lorry vehicle, and a main body for a lorry vehicle. To provide a fuel tank. A second object of the present invention is to provide a fuel tank system for a lorry and a lorry capable of easily and reliably installing a sub fuel tank.

The present invention has been made to solve the first problem,
A fuel tank system for a truck according to the present invention includes:
A main fuel tank having a tank chamber for storing fuel;
A tank chamber for storing fuel; a sub fuel tank disposed above the main fuel tank; and a supply conduit for communicating the tank chamber of the main fuel tank and the tank chamber of the sub fuel tank A fuel tank system for a truck,
A float that is arranged in the tank chamber of the main fuel tank and moves up and down according to the amount of fuel in the tank chamber;
A support mechanism for supporting the float so that the locus of vertical movement of the float is constant;
A movement restricting means for restricting the movement of the float, and an on-off valve for controlling start and stop of fuel injection through the supply pipe line according to the height of the float are provided.

  In this fuel tank fuel tank system, when the fuel in the tank chamber of the main fuel tank decreases, the float moves downward, and when the float becomes lower than a predetermined height, the on-off valve is opened and the tank chamber of the sub fuel tank is opened. The fuel is supplied to the tank chamber of the main fuel tank through the supply pipe. Further, when fuel is supplied to the tank chamber of the main fuel tank and the float becomes higher than a predetermined height, the on-off valve is closed and the supply of fuel from the tank chamber of the sub fuel tank is stopped. In addition, the fuel tank system for a lorry has a movement restricting means for restricting the movement of the float even when the fuel level fluctuates during driving and force is applied to the float. Therefore, the force acting on the support mechanism can be reduced, and the support mechanism can be prevented from being damaged.

  The fuel tank system for a truck is preferably configured so that the movement restricting means abuts on the float when moving downward by a certain amount or more. By adopting this configuration, when the fuel in the tank chamber of the sub fuel tank is not supplied due to the tank chamber of the sub fuel tank being emptied and the fuel in the tank chamber of the main fuel tank is reduced, movement restrictions are applied. The means abuts on the float, so that the float does not move downwards beyond a certain level. For this reason, the float is not easily affected by the undulation of the liquid level of the fuel when the fuel in the tank chamber of the main fuel tank is low, and the support mechanism can be prevented from being damaged more accurately.

  In the fuel tank system for a truck, it is preferable that the movement restricting means is configured to restrict the movement of the float in the horizontal direction. By adopting this configuration, even if the liquid level of fuel fluctuates during traveling and a horizontal force acts on the float, the movement restricting means restricts the movement of the float in the horizontal direction and supports it from the float. The force acting on the mechanism can be reduced, and damage to the support mechanism can be prevented more accurately.

  In the fuel tank system for a lorry, it is preferable that a groove is formed at the bottom of the float, and the movement restricting means is composed of a restricting member interposed in the groove. As a result, when the fuel in the tank chamber of the sub fuel tank is not supplied due to the tank chamber of the sub fuel tank becoming empty and the fuel in the tank chamber of the main fuel tank is reduced, Since the float is in contact with the upper surface and the float does not move downward more than a certain level, the float is not easily affected by the undulation of the liquid level of the fuel when the fuel in the tank chamber of the main fuel tank is reduced. Further, even if the liquid level of the fuel undulates during traveling and a horizontal force acts on the float, the movement of the float is restricted by the movement restricting means interposed in the groove, and the support mechanism from the float The force acting on the can be reduced. For this reason, damage of a support mechanism can be prevented more precisely by this restricting member.

  In the case where the restricting member is provided as described above, the restricting member has a contact portion that can contact the upper surface of the groove portion of the float and an extending portion that extends downward from the contact portion. It is preferable. Accordingly, the vertical movement of the float can be regulated by the contact part, and the rotation of the float can also be regulated by the extension part, so that the breakage of the support mechanism can be prevented more accurately.

  In the fuel tank system for lorries, it is possible to configure the on-off valve to be electrically opened and closed, but it is necessary to physically open and close the on-off valve in order to be cautious about installing electrical equipment around the fuel. It is preferable to provide it. Specifically, it is preferable to employ a configuration in which the support mechanism is connected to the on-off valve so as to open and close the on-off valve by the vertical movement of the float. As a result, the on-off valve can be opened and closed without providing electrical equipment around the fuel.

  In addition, in the case of adopting a configuration that physically opens and closes the on-off valve as described above, it is possible to arrange the on-off valve in the supply pipe line, but there is a mechanism for transmitting the vertical movement of the float to the on-off valve. Since there is a risk of complication, it is preferable to provide an on-off valve to open and close in the main fuel tank. Specifically, the main fuel tank is connected to the supply line and has an injection line for injecting fuel into the tank chamber, and the open / close valve is configured to open and close the flow path of the injection line, It is preferable to employ a configuration in which the support mechanism has a swing link that swings by the vertical movement of the float and opens and closes the on-off valve by swinging. Thereby, the rocking link is rocked by the vertical movement of the float, and the on-off valve is opened and closed by this rocking.

  It is preferable that the fuel tank system for a truck uses a configuration in which the top surface portion of the main fuel tank has a locking portion that locks the upper portion of the float that has moved upward. As a result, when the fuel is filled into the tank chamber of the main fuel tank such that the tank chamber of the main fuel tank is filled up, etc. Since the float is locked by the portion, the horizontal movement of the float is restricted, the force acting on the support mechanism from the float during traveling can be reduced, and damage to the support mechanism can be prevented more accurately.

  When the top surface portion has a locking portion as described above, the main fuel tank has a tank body having an upper opening portion, and a lid on which the upper opening portion of the tank body is closed and the locking portion is formed. It is preferable to employ a configuration having a portion. Thus, by removing the lid, the float is exposed from the upper open part of the tank body, so that the float can be repaired easily.

  In the fuel tank system for a cargo vehicle, the support mechanism has a rod-like link whose tip is screwed to the float, and the rod-like link has a shaft portion and a weight portion extending below the shaft portion. It is preferable to adopt a configuration. As a result, the float can be easily attached by screwing, and the rod-shaped link has a weight portion, so that it is possible to accurately prevent the float from being detached due to inadvertent rotation of the rod-shaped link. That is, when there is no weight portion, the rod-shaped link may gradually rotate due to long-term use, and the rod-shaped link may be unscrewed from the threaded portion of the float. By providing the weight portion, it is possible to prevent continuous rotation of the rod-shaped link in the same direction by the weight of the weight portion.

In addition, the fuel tank system for trucks is to solve the second problem,
The sub fuel tank may be formed in a vertical shape whose length in the width direction and height in the vertical direction are longer than the length in the front-rear direction, and the front surface thereof is disposed so as to face the back surface of the cabin of the lorry. it can.

  By adopting this configuration, it is possible to store a sufficient amount of fuel in the sub fuel tank while saving space in the front-rear direction, and thus it can be used in various types of cargo vehicles. “Width direction” means the width direction of the lorry, “up and down” means the vehicle height direction, and “front and back direction” means the anteroposterior direction (traveling and retreating direction) of the lorry. .

  When the above configuration is adopted, it is preferable that the sub fuel tank is composed of a plurality of small vertical tanks arranged in the front-rear direction. This makes it possible to store fuel in a plurality of vertical small tanks.

  In the case of having a plurality of vertical small tanks as described above, it is preferable to further include a heat insulating layer disposed between the vertical small tanks. Thereby, it is possible to prevent the heat of one vertical small tank from being transferred to the other vertical small tank. For this reason, for example, even if the vertical small tank on the traveling direction side is heated, it is possible to prevent the vertical small tank located behind it from becoming hot.

  In addition, a truck according to the present invention includes a fuel tank system for a truck that has the above-described configuration.

  In the lorry, the fuel can be stored not only in the main fuel tank but also in the sub fuel tank. When the float is lower than the predetermined height, the on-off valve is opened and the fuel in the tank chamber of the sub fuel tank is opened. Can be supplied to the tank chamber of the main fuel tank via the supply line, and even if the fuel level fluctuates during driving and the force acts on the float, the movement that regulates the movement of the float Since the restricting means is provided, the force acting on the support mechanism from the float can be reduced, and the support mechanism can be accurately prevented from being damaged.

Moreover, in order to solve the 1st subject, the main fuel tank for trucks concerning the present invention,
A fuel tank for a cargo vehicle having a tank chamber in which fuel is stored,
An injection line for injecting fuel into the tank chamber;
A float that is arranged in the tank chamber of the main fuel tank and moves up and down according to the amount of fuel in the tank chamber;
A support mechanism for supporting the float so that the locus of vertical movement of the float is constant;
It comprises a movement restricting means for restricting the movement of the float, and an opening / closing valve for opening and closing the injection pipe according to the height of the float.

  In the main fuel tank for a truck, when the fuel in the tank chamber decreases, the float moves downward. When the float becomes lower than a predetermined height, the on-off valve is opened, and fuel is supplied from the injection pipe to the tank chamber. It becomes possible. When the fuel is supplied to the tank chamber and the float becomes higher than a predetermined height, the on-off valve is closed and the fuel supply from the injection pipe is stopped. The main fuel tank for a lorry has a movement restricting means for restricting the movement of the float even when the fuel level fluctuates during driving and force is applied to the float. The force acting on the support mechanism can be reduced, and the support mechanism can be accurately prevented from being damaged. In the main fuel tank for a lorry, it is possible to adopt the above-described configuration for the float, the support mechanism, the movement restricting means, and the like.

  As described above, in the present invention, breakage of the support mechanism that supports the float in the tank chamber can be accurately prevented.

1 is a schematic side view of a tow vehicle according to an embodiment of the present invention. It is a schematic perspective view of the fuel tank system of the tow vehicle of FIG. It is a schematic sectional side view of the main fuel tank of the towed vehicle of FIG. FIG. 2 is an end view taken along line AA in FIG. 1, and is an end view illustrating only a float and a movement restricting unit. It is explanatory drawing of the main fuel tank of the towed vehicle of FIG. 1, Comprising: It is the schematic end elevation which expanded the rocking | fluctuation link. It is a schematic sectional side view of the main fuel tank of the towed vehicle of other embodiment which concerns on this invention. It is a schematic sectional front view of the main fuel tank of the towed vehicle of FIG.

<First embodiment>
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, as an embodiment of a truck according to the present invention, a towed vehicle 1 that pulls a trailer type vehicle T shown in FIG. 1 will be described as an example.

<Traction vehicle 1>
The towed vehicle 1 of the present embodiment includes a cabin 10 in which a driver's seat is formed, and a connecting portion 20 that extends rearward from the cabin 10 and connects a trailer type vehicle T. The connecting unit 20 is equipped with the fuel tank system 100 for a lorry (hereinafter simply referred to as a fuel tank system).

<Fuel tank system 100>
The fuel tank system 100 includes a main fuel tank 200 having a tank chamber for storing fuel (hereinafter simply referred to as a main tank) and a sub fuel tank 300 having a tank chamber for storing fuel (hereinafter simply referred to as a sub tank). And a supply conduit 400 that communicates the tank chamber of the main tank 200 and the tank chamber of the sub tank 300. Various supply pipes 400 can be adopted, but a flexible tube is preferably used.

<Sub tank 300>
The sub tank 300 is placed and fixed on the upper portion of the connecting portion 20, and is arranged so that the front surface faces the back surface of the cabin 10.

  The sub-tank 300 is composed of a plurality of (two in the illustrated example) vertical small tanks 320 in which the internal tank chambers are communicated with each other via a connection pipe 310. The vertical small tank 320 is formed in a vertical shape whose length in the width direction and vertical height are longer than the length in the front-rear direction, and the plurality of vertical small tanks 320 are arranged side by side in the front-rear direction. A heat insulating layer 330 is disposed between them. Here, as the heat insulation layer 330, various layers having an effect of insulating heat can be adopted, and for example, the heat insulation layer 330 can be composed of asbestos or the like. The vertical small tank 320 is provided with a fuel filler (not shown), and a cap (not shown) is detachably attached to the fuel filler.

  In this embodiment, the vertical small tank 320 on the rear side has a larger capacity than the vertical small tank 320 on the front side. Specifically, the vertical small tank 320 on the front side has 200. A liter of fuel can be stored, and a vertical small tank 320 on the rear side is provided so as to store 300 liters of fuel.

  The sub tank 300 is formed in a vertical shape whose length in the width direction and vertical height are longer than the length in the front-rear direction. The length in the width direction of the sub tank 300 is set to be the same as or slightly shorter than the length in the width direction of the vehicle. Specifically, the length in the width direction of the sub-tank 300 is preferably 2/3 or more and 1/1 or less, more preferably 3/4 or more and 6/7 or less, and even more preferably the length in the width direction of the vehicle. Is 4/5 or more and 5/6 or less. The vertical height of the sub tank 300 is preferably 1/6 or more and 2/3 or less, more preferably 1/5 or more and 1/2 or less, and further preferably 1/4 or more and 1 /. 3 or less. Further, the length of the sub tank 300 in the front-rear direction is preferably 1/20 or more and 1/4 or less, more preferably 1/10 or more and 1/5 or less, relative to the length of the connecting portion 20 in the front-rear direction. Preferably they are 1/8 or more and 1/6 or less.

  Further, the capacity of the sub tank 300 is not particularly limited, but is preferably 100 liters or more and 800 liters or less, more preferably 200 liters or more and 600 liters or less, and 300 liters or more and 500 liters or less. More preferably.

<Main tank 200>
As shown in FIG. 1, the main tank 200 of the present embodiment is fixed to the connecting portion 20 by a fixing frame (not shown), and is disposed below the sub tank 300.

  As shown in FIG. 2, the main tank 200 includes a tank body 201 that constitutes a tank chamber and has an upper opening portion, and a lid portion 203 that closes the upper opening portion of the tank body 201. The main tank 200 is provided with an oil filler opening, and a cap 205 is detachably attached to the oil filler opening.

  The main tank 200 has an injection pipe 210 for injecting fuel into the tank chamber, a float 230 that is arranged in the tank chamber and moves up and down in accordance with the amount of fuel in the tank chamber, and a trajectory of the vertical movement of the float 230. A support mechanism 250 that supports the float 230 so as to be constant, a movement restricting means 270 that restricts the movement of the float 230, and an on-off valve 290 that opens and closes the injection pipe 210 according to the height of the float 230 are provided.

(Injection line 210)
The injection line 210 is connected to the supply line 400, and as shown in FIG. 3, one end protrudes into the tank chamber and the other end protrudes outside the tank chamber. A male screw is formed on the outer periphery of the other end of the injection pipe 210, and one end of the supply pipe 400 is connected to the injection pipe 210 by the male screw. The other end of the supply pipeline 400 is connected to a spout (not shown) provided below the sub tank 300. In addition, although the material etc. of the injection pipe line 210 are not specifically limited, Metal things, such as iron and stainless steel, are used suitably.

(Float 230)
Various floats can be used as long as they float on the fuel in the tank chamber. For example, the float 230 can be formed of a hollow molded product made of synthetic resin.

  The float 230 has a female screw portion (not shown) for attaching the support mechanism 250 and a groove portion 231 formed in the bottom portion. Here, the float 230 of the present embodiment is formed in a rectangular parallelepiped shape with a rounded shape, and the female screw portion is formed on this side surface. Further, the groove portion 231 is formed along the hole forming direction of the female screw portion. That is, the groove 231 is formed along a direction substantially parallel to the swing direction of the support mechanism 250 (the swing link 251 thereof) described later. The groove portion 231 is formed from one side surface to the other side surface. Moreover, the groove part 231 is formed so that it may become wide toward the open side (lower side). In addition, the upper part of the float 230 is formed in a shape that rises upward along the center.

(Support mechanism 250)
The support mechanism 250 is rotatably connected to a rod-shaped swing link 251 (bar-shaped link) whose one end is screwed to the float 230 and the other end of the swing link 251 and is connected to the injection conduit 210. A fixed link 253 is fixed, and an operation link 255 is rotatably connected to a middle portion of the swing link 251 and opens and closes the on-off valve 290. That is, the support mechanism 250 is provided so that the float 230 moves up and down along a plane on which the swing link 251 swings. One end of the operating link 255 is connected to the swing link 251 as described above, and the other end is connected to the on-off valve 290, whereby the swing link 251 is connected to the on-off valve 290 via the operating link 255. It is connected to. That is, the rocking link 251 is swung by the vertical movement of the float 230, and the operation link 255 is moved vertically by this rocking, so that the on-off valve 290 is opened and closed, and enters the tank chamber via the supply pipe 400. The start and stop of the fuel injection is controlled. More specifically, when the float 230 has a certain height or more, the operating link 255 closes the on-off valve 290 and does not inject fuel into the tank chamber, so that the float 230 has a certain height. When it becomes less, the operating link 255 opens the on-off valve 290 and controls to inject fuel into the tank chamber.

  In addition, although the material of each member which comprises the support mechanism 250 is not specifically limited, Metal things, such as iron and stainless steel, are used suitably. Further, as shown in FIG. 5 and the like, the swing link 251 screwed to the float 230 has a shaft portion 251a and a weight portion 251b extending below the shaft portion 251a. The swing link 251 is preferably made of a material having a higher specific gravity in the weight portion 251b than in the shaft portion 251a.

(Movement restriction means 270)
The movement restricting means 270 is configured to come into contact with the float 230 when moving downward by a certain amount or more, and restricts the movement of the float 230 in the horizontal direction (direction intersecting the plane on which the swing link 251 swings). In addition, the rotation of the float 230 is restricted. Specifically, the movement restricting means 270 is composed of a restricting member interposed in the groove portion 231 of the float 230. As shown in FIG. 3, the regulating member 270 is composed of a substantially L-shaped member, one end of the L-shaped short side is fixed to the injection conduit 210, and the long side portion is interposed in the groove portion 231. Yes.

  The restriction member 270 has a contact portion 271 that can contact the upper surface of the groove portion 231 of the float 230, and an extending portion 273 that extends downward from the contact portion 271. Specifically, as shown in FIG. 4, the long side portion of the regulating member 270 includes a contact portion 271 having a circular cross-sectional shape, and a plate-like extension portion 273 narrower than the contact portion 271. It is composed of Since the extending portion 273 is provided in this way, the rotation of the float 230 can be prevented by the restriction member 270. The material or the like of the restricting member 270 is not particularly limited, but a metal member such as iron or stainless steel is preferably used.

(Locking part 207)
Further, the top surface portion of the main tank 200 has a locking portion 207 that locks the upper portion of the float 230 that has moved upward. Specifically, a concave portion (locking portion 207) having substantially the same shape as the upper shape of the float 230 is formed on the top surface portion at a location where the float 230 moves upward, and the float that has moved upward is formed. The upper part of 230 is formed so as to fit into the recess 207. The recess 207 is formed in the lid 203 that closes the upper opening of the tank body 201 (see FIG. 3).

<Effect>
In the towed vehicle 1 of the present embodiment having the above-described configuration, the float 230 moves downward when the fuel in the tank chamber of the main tank 200 decreases, and the open / close valve 290 is opened when the float 230 becomes lower than a predetermined height. The fuel in the tank chamber of the sub tank 300 is supplied to the tank chamber of the main tank 200 via the supply pipe 400. Further, when fuel is supplied to the tank chamber of the main tank 200 and the float 230 becomes higher than a predetermined height, the on-off valve 290 is closed and the supply of fuel from the tank chamber of the sub tank 300 is stopped.

  The towed vehicle 1 has the movement restricting means 270 that restricts the movement of the float 230 even when the fuel level fluctuates during driving and force is applied to the float 230 from the fuel. The force acting on the support mechanism 250 from 230 can be reduced, and damage to the support mechanism 250 can be accurately prevented.

  In other words, even if the liquid level of fuel fluctuates during traveling and a force in the horizontal direction (direction intersecting the plane on which the swing link 251 swings) acts on the float 230, the restriction interposed in the groove 231. The movement of the float 230 in the horizontal direction is restricted by the member 270, and the force acting on the support mechanism 250 from the float 230 can be reduced. Therefore, breakage of the support mechanism 250 can be prevented more accurately.

  In particular, when the tank chamber of the sub tank 300 is emptied and the fuel in the tank chamber of the main tank 200 decreases, the regulating member 270 contacts the upper surface of the groove portion 231 of the float 230, and the float 230 moves downward by a certain amount or more. Therefore, the float 230 is not or hardly affected by the undulation of the liquid level of the fuel when the fuel in the tank chamber of the main tank 200 is low. In addition, since the contact portion 271 of the regulating member 270 has a circular cross-sectional shape, there is an advantage that the float 230 that contacts the contact portion 271 is hardly damaged.

  Furthermore, since the restricting member 270 has an extended portion 273 extending downward from the contact portion 271, the rotation of the float 230 can also be restricted by the contact portion 271, so that the float 230 swings. Inadvertent detachment from the link 251 can be prevented, and damage to the support mechanism 250 due to the rotation of the float 230 can be prevented.

  Further, since the top surface portion of the main tank 200 has a locking portion 207 that locks the upper portion of the float 230 that has moved upward, the tank chamber of the main tank 200 is filled up and the float 230 is placed on the top of the main tank 200. When the fuel is filled in the tank chamber of the main tank 200 to such an extent that it abuts the surface portion, the float 230 is locked by the locking portion 207 (concave portion) of the top surface portion, and thus the horizontal movement of the float 230 is restricted. As a result, the force acting on the support mechanism 250 from the float 230 during traveling can be reduced, and damage to the support mechanism 250 can be prevented more accurately.

  Further, the float 230 is exposed from the upper open part of the tank body 201 by removing the lid 203 on which the locking part 207 is formed, so that the repair and replacement of the float 230 and the support mechanism 250 can be easily performed. Can be done.

  In addition, since the support mechanism 250 is connected to the open / close valve 290 so that the open / close valve 290 is opened and closed by the vertical movement of the float 230, the towing vehicle 1 is provided with an electrical device such as an electromagnetic control valve around the fuel. There is no need to do. Further, since the main tank 200 is connected to the supply line 400 and has an injection line 210 for injecting fuel into the tank chamber, and the on-off valve 290 opens and closes the flow path of the injection line 210. The opening / closing of the on-off valve 290 can be controlled with a simple structure.

  Further, the swing link 251 (rod-shaped link) of the support mechanism 250 has a weight portion 251b extending below the shaft portion 251a. Therefore, even if the attachment structure of the float 230 is an easy and simple structure by screwing, Unintentional rotation of the moving link 251 can be prevented by the weight portion 251b, and therefore the detachment of the float 230 can be accurately prevented. That is, when the weight portion 251b is not provided, the swing link 251 may gradually rotate due to long-term use, and the swing link 251 may be unscrewed from the female screw portion of the float 230. For this reason, by providing the weight part 251b as described above, continuous rotation of the swing link 251 in the same direction can be prevented by the weight of the weight part 251b, and the detachment of the float 230 can be accurately prevented.

  Further, the towed vehicle 1 is disposed so that the front surface of the vertical sub tank 300 faces the back surface of the cabin 10 of the cargo vehicle, so that a sufficient amount of fuel is saved while saving space in the front-rear direction. Can be stored in the sub tank 300. In particular, even in the towed vehicle 1 as in the present embodiment, the sub-tank 300 can be mounted outside the rotation area of the trailer type vehicle T. Further, since the sub-tank 300 is composed of a plurality of vertical small tanks 320 arranged in the front-rear direction, fuel can be stored in the plurality of vertical small tanks 320. Further, since the heat insulating layer 330 disposed between the vertical small tanks 320 is provided, the heat of one vertical small tank 320 can be prevented from being transferred to the other vertical small tank 320. That is, even if the vertical small tank 320 on the traveling direction side facing the cabin 10 is heated by the heat of the engine or the like, it is possible to prevent the vertical small tank 320 located behind it from becoming hot.

<Other embodiments>
The present invention is not limited to the above-described embodiment, and can be appropriately modified within the scope intended by the present invention.

  That is, in the above embodiment, the sub tank 300 has been described as having a plurality of vertical small tanks 320, but the fuel tank system 100 of the present invention is not limited to this, and the sub tank consisting of only one tank. Even 300 is within the intended scope of the present invention. Further, even when the sub tank 300 is constituted by a plurality of small vertical tanks 320, the number of the small tanks 320 is not limited to two as in the illustrated example. For example, three vertical small tanks 320 may be provided. It is. In this case, it is preferable to interpose the heat insulating layer 330 between the vertical small tanks 320.

  Further, even in the case of having a plurality of vertical small tanks 320, the vertical small tanks 320 are not limited to being connected to each other by the connection pipe line 310 as in the above embodiment. The vertical small tank 320 may be connected to the supply pipe 400.

  Further, in the above embodiment, there is no mention of providing a manual valve or the like in the supply pipeline 400 or the sub tank 300. However, it is also appropriate to provide a valve body such as a manual valve in the supply pipeline 400 or the sub tank 300. It can be changed. Moreover, when it has the some vertical small tank 320 as mentioned above, it is also possible to provide valve bodies, such as a manual valve, in each vertical small tank 320. FIG. As a result, only the valve body of the vertical small tank 320 on the front side is opened and the valve body of the vertical small tank 320 on the rear side is closed, so that the fuel of the vertical small tank 320 on the front side is first. Can be supplied to the main tank 200, and the vertical small tank 320 on the front side can be emptied first.

  Moreover, in the said embodiment, although the shape of the front surface of the subtank 300 is not demonstrated concretely, in addition to making this front surface shape flat, it can also form in a wave shape, for example, and can also obtain the thermal radiation effect. . In addition, it is also a matter that the design can be appropriately changed to dispose a heat insulating layer as in the above embodiment on the front surface.

  Furthermore, although the mounting and fixing method of the sub tank 300 is not specifically described, the sub tank 300 (vertical small tank 320) can be mounted and fixed in a detachable manner, for example, as many as desired. A vertical small tank 320 can also be mounted and used.

  In the above embodiment, the movement restricting means 270 has been described as being composed of a restricting member interposed in the groove 231 of the float 230, but the present invention is not limited to this. That is, as the movement restricting means 270, various means can be adopted as long as it can restrict the movement of the float 230 based on the undulation of the fuel. In the above embodiment, the movement restricting means 270 contacts the float 230 when moving downward by a certain amount and intersects (orthogonally) the horizontal direction of the float 230 (the plane of the locus in which the float 230 moves up and down). Although the description has been given of the configuration configured to restrict the movement in the direction), for example, only the former (contact with the float 230) may be used, or only the latter (horizontal movement restriction) may be used.

  More specifically, for example, a mesh member (movement restricting means) that comes into contact with the bottom of the float 230 when the float 230 moves below a certain level can be provided in the tank chamber. Further, a pair of guides (movement restriction means) are arranged along the vertical direction, and the pair of guides are substantially in contact with the side surfaces of the float 230 so that the horizontal movement of the float 230 is restricted. It is also possible to do.

  Further, the specific configuration of the support mechanism 250 is not limited to that of the above-described embodiment, and various mechanisms for making the locus of the vertical movement of the float 230 constant can be employed. In addition, although the support mechanism 250 is configured to open and close the on-off valve 290 by the vertical movement of the float 230, the present invention is not limited to this. However, in the present invention, it is preferable that the support mechanism 250 is configured to open and close the on-off valve 290 by the vertical movement of the float 230 as in the above-described embodiment, thereby using an electrical signal or the like that detects the vertical movement of the float 230. There is no need.

  In the fuel tank system for a truck, the configuration shown in FIGS. 6 and 7 can be adopted. The main tank 500 shown in FIGS. 6 and 7 is arranged in the tank chamber and supports the float 530 such that the float 530 moves up and down according to the amount of fuel in the tank chamber, and the locus of the vertical movement of the float 530 is constant. And an opening / closing valve 290 for controlling the start / stop of fuel injection via the injection pipe 210 in accordance with the height of the float 530. Hereinafter, the main tank 500 of FIGS. 6 and 7 will be described, but the same reference numerals are used for those having substantially the same configuration and function as the first embodiment, and the description thereof may be omitted.

  The main tank 500 shown in FIGS. 6 and 7 has a cylindrical body 510 in which a hollow portion is formed in the vertical direction. The float 530 is disposed in the hollow portion of the cylindrical body 510 so as to be movable up and down. The cylindrical body 510 constitutes the support mechanism and the movement restricting means.

  In addition, the cylindrical body 510 is provided with a contact portion 511 below the hollow portion, and the contact portion 511 is composed of a rod-shaped member, between the hollow portion and the lower portion of the hollow portion. In order to allow fuel to flow, it is attached so as not to close the cavity. When the contact portion 511 moves downward by a certain amount or more, a movement restricting means that contacts the float 530 is configured. Note that such movement restricting means is not limited to the above-described rod-shaped member, and for example, it is also possible to change the design appropriately from the extending portion extending inward from the cylindrical body. .

  6 and 7 is formed with a perforation 513, and the perforation 513 is configured to allow fuel to flow between the cavity and the outside of the cavity (front and rear). For this reason, the fuel easily flows into the cavity through the perforations 513, and the change in the liquid level of the fuel due to the increase or decrease in fuel tends to coincide with the change in the liquid level of the fuel in the cavity, and the liquid level of the fuel in the cavity The float 530 moves up and down according to the change. Further, the cylinder 510 is formed in a substantially square cylinder shape, and the perforations 513 are formed on the front and back surfaces (wall surfaces before and after the running direction), and are formed on both side surfaces (wall surfaces in the running direction lateral direction) of the cylinder 510. Not formed. Since it is considered that the undulation of the liquid level of the fuel in the main tank 500 during traveling is stronger in the lateral direction than in the front-rear direction, the undulation force acts on the float 530 by arranging the perforations 513 as described above. The float 530 easily moves up and down according to the change in the liquid level due to the increase or decrease of the fuel.

  The cylindrical body 510 is fixed to the injection pipe 210 in the illustrated example, but the fixing method of the cylindrical body 510 is not particularly limited, and fixing to the tank body 201 is also a matter whose design can be changed as appropriate. is there.

  Further, the float 530 shown in FIGS. 6 and 7 has an outer diameter slightly smaller than the inner diameter of the cavity, and is disposed in the cavity so as to be movable up and down as described above. Here, the float 530 has an air chamber inside and is formed in a substantially square box shape made of hard synthetic resin. Further, the float 530 has an extending portion 530a whose side wall extends downward from the bottom wall.

  Further, the float 530 shown in FIGS. 6 and 7 is provided with a link mechanism 540 for opening and closing the on-off valve 290 by the vertical movement of the float 530. The link mechanism 540 has a first link 541 whose one end is connected to the upper portion of the float 530, one end rotatably connected to the other end of the first link 541, and the other end tilted to the opening / closing valve 290. And a second link 543 that can be connected. Specifically, the second link 543 is formed of a bent substantially L-shaped member. When the first link 541 moves up and down by the vertical movement of the float 530, the second link 543 is connected to the on-off valve 290. The other end of the second link 543 tilts in the front view, and the on-off valve 290 is opened and closed by the tilt of the second link 543. In addition, regarding the connection between the first link 541 and the float 530, a hole portion into which the first link 541 can be inserted is provided in the float 530, and one end of the first link 541 is inserted into the hole portion, so that the first link 541 is desired. It is also possible to configure so as to be fixed to the float 530 at a location, and by configuring in this way, the liquid level position at which the on-off valve 290 opens and closes can be adjusted by the location where the first link 541 is secured.

  6 and 7, the float 530 has been described as being contained in the cylindrical body 510. For example, the float 530 is provided with a hole that is partitioned from the upper side to the lower side, and a tank is provided in the hole. It is also possible to insert a rod-like member that is relatively fixed to the main body, and to provide the rod-like member so as to restrict the horizontal movement of the float 530. However, when only such a rod-like member is provided and the cylinder 510 is not provided, the rod-like member itself may be damaged by a force acting on the float 530 due to the undulation of the liquid level of the fuel. For this reason, even when providing such a rod-shaped member, it is preferable to provide the cylindrical body 510 as shown in FIGS.

  As described above, the present invention can be effectively used as a fuel tank system in a truck such as a tow vehicle and a large truck.

DESCRIPTION OF SYMBOLS 1 Towing vehicle 10 Cabin 20 Connection part 100 Fuel tank system 200 for trucks Main tank 201 Tank main body 203 Cover part 205 Cap 205 Locking part (concave part)
210 Injection Pipe 230 Float 231 Groove 250 Support Mechanism 251 Bar Link 251a Shaft 251b Weight 253 Fixed Link 255 Actuation Link 270 Movement Restricting Means (Regulating Member)
271 Contact part 273 Extension part 290 On-off valve 300 Sub tank 310 Connection pipe line 320 Vertical small tank 330 Heat insulation layer 400 Supply pipe line 500 Main tank 510 Tubular body 511 Contact part 513 Perforation 530 Float 530a Extension part 540 Link mechanism 541 First link 543 Second link T Trailer type vehicle

Claims (15)

A main fuel tank having a tank chamber for storing fuel;
A tank chamber for storing fuel; a sub fuel tank disposed above the main fuel tank; and a supply conduit for communicating the tank chamber of the main fuel tank and the tank chamber of the sub fuel tank A fuel tank system for a truck,
A float that is arranged in the tank chamber of the main fuel tank and moves up and down according to the amount of fuel in the tank chamber;
A support mechanism for supporting the float so that the locus of vertical movement of the float is constant;
A fuel tank for a lorry comprising a movement restricting means for restricting the movement of the float, and an on-off valve for controlling start and stop of fuel injection through the supply pipe line according to the height of the float system.   The fuel tank system for a lorry according to claim 1, wherein the movement restricting means is configured to come into contact with the float when the movement restricting means moves downward by a certain amount or more.   The fuel tank system for a lorry according to claim 1 or 2, wherein the movement restricting means is configured to restrict movement of the float in the horizontal direction. A groove is formed at the bottom of the float,
The fuel tank system for a truck according to claim 1, wherein the movement restricting means is constituted by a restricting member interposed in the groove.   The fuel tank system for a truck according to claim 4, wherein the regulating member has a contact portion capable of contacting the upper surface of the groove portion of the float and an extending portion extending downward from the contact portion.   The fuel tank system for a truck according to any one of claims 1 to 5, wherein the support mechanism is connected to the on-off valve so as to open and close the on-off valve by the vertical movement of the float. The main fuel tank has an injection line connected to the supply line for injecting fuel into the tank chamber;
The on-off valve is configured to open and close the flow path of the injection pipe line,
The fuel tank system for a truck according to claim 6, wherein the support mechanism has a swing link that swings by the vertical movement of the float and opens and closes the on-off valve by the swing.   The fuel tank system for a truck according to any one of claims 1 to 7, wherein the top surface portion of the main fuel tank has a locking portion that locks an upper portion of the float that has moved upward.   9. The fuel tank for a lorry according to claim 8, wherein the main fuel tank has a tank body having an upper opening portion, and a lid portion that closes the upper opening portion of the tank body and is formed with the locking portion. system. The support mechanism has a rod-like link whose tip is screwed to the float;
The fuel tank system for a truck according to any one of claims 1 to 9, wherein the rod-shaped link includes a shaft portion and a weight portion extending below the shaft portion.   The sub fuel tank is formed in a vertical shape whose width direction length and vertical height are longer than the length in the front-rear direction, and the front surface thereof is disposed so as to face the back surface of the cabin of the lorry. Item 11. The fuel tank system for a truck according to any one of Items 10.   The fuel tank system for a truck according to claim 11, wherein the sub fuel tank is composed of a plurality of small vertical tanks arranged in the front-rear direction.   The fuel tank system for a truck according to claim 12, further comprising a heat insulating layer disposed between the vertical small tanks.   A truck equipped with the fuel tank system for a truck according to any one of claims 1 to 13. A main fuel tank for a lorry having a tank chamber in which fuel is stored,
An injection line for injecting fuel into the tank chamber;
A float that is arranged in the tank chamber of the main fuel tank and moves up and down according to the amount of fuel in the tank chamber;
A support mechanism for supporting the float so that the locus of vertical movement of the float is constant;
A main fuel tank for a lorry, comprising: movement restriction means for restricting movement of the float; and an on-off valve that opens and closes the injection pipe according to the height of the float.

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