DE102015001863A1 - Tank unit for a commercial vehicle - Google Patents

Abstract

The invention relates to a tank unit for a vehicle, preferably for a commercial vehicle, comprising a tank body (5) which can be filled with fuel, from which a fuel line (7) for supplying fuel to an internal combustion engine (11) is led out and a fuel return line (13), which is returned to the tank body (5). In a tank unit, the fuel return line (13) ends in the interior of the tank body (5) in a container (19) receiving recirculated fuel (23).

Description

The invention relates to a tank unit for a vehicle, preferably for a utility vehicle, comprising a fuel-filled tank body, from which a fuel line for supplying fuel to an internal combustion engine is led out and a fuel return line, which is returned to the tank body.

From the DE 10 2012 015 775 A1 For example, there is known a utility vehicle refueling apparatus comprising a tank body having a tank body volume, a fuel buffer, and an auxiliary pumping device provided, at least in an operating condition, to deliver the fuel into the fuel buffer.

In particular, in diesel vehicles, in which the fuel from the fuel volume is passed through a fuel pump to an internal combustion engine, arise fuel residues that are not processed by the engine and which are returned via a fuel return line in the tank body.

The disadvantage here is that it can come to a delayed start of the engine at an idling of the fuel return line due to changing pressure conditions in the fuel system.

The object of the invention is to provide a tank unit, in which even after prolonged downtime, a start of the engine is performed quickly.

The invention results from the features of the independent claims. Advantageous developments and refinements are the subject of the dependent claims. Other features, applications and advantages of the invention will become apparent from the following description, as well as the explanation of embodiments of the invention, which are illustrated in the figures.

The object is achieved with a tank unit in that the fuel return line ends in the interior of the tank body in a, receiving fuel receiving container. Thus, a permanent residual volume is generated at the tank inside the mouth of the fuel return line, which means that even after longer downtime, a reliable start of the engine can be performed.

Advantageously, the fuel return line ends below a fuel level of the tank body in the container. Since the residual volume is kept in the tank regardless of the actual fuel level in the tank body, suitable pressure conditions for rapid start of the internal combustion engine in the tank unit are always found.

In one embodiment, the fuel return line terminates below the fuel tank indicative fuel level of the tank body in the container. Since an idling volume is always in the container, a start of the engine can be performed at any time.

In one variant, the container is designed to be open on a side receiving the fuel return line. Thereby act on the residual volume of the fuel in the container exactly the same pressure conditions as on the fuel in the tank body, so that the corresponding pressure ratios to the work of the fuel pump, which promotes fuel from the tank body to the engine maintained.

In one embodiment, the container sits on a bottom of the tank body. This ensures that even with an empty tank sufficient return volume is present in the container.

In one development, the side facing away from the bottom of the container is designed to be open. As a result, a permanent filling is ensured by the fuel return line.

In a further development, the end of the fuel return line dips into the fuel stored in the container. Since the end of the fuel return line is always immersed in the residual volume of the fuel in the container, height variations of the container volume, which are due to a tilt angle of the commercial vehicle, are compensated.

In a particularly simple embodiment, the container is cup-shaped, whereby a cost-effective additional element is introduced into the tank.

A development of the invention relates to a vehicle which comprises a tank unit. The tank unit is characterized by at least one, executed in this patent application feature.

Further advantages, features and details will become apparent from the following description in which - where appropriate, with reference to the drawings - at least one embodiment is described in detail. Described and / or illustrated features may be for themselves or in any meaningful combination the subject of the Form invention, optionally also independent of the claims, and in particular may additionally be the subject of one or more separate application / s. The same, similar and / or functionally identical parts are provided with the same reference numerals.

Show it:

1 an embodiment of a motor vehicle according to the invention,

2 An embodiment of a tank unit according to the invention.

1 shows an embodiment of a motor vehicle according to the invention 1 with a tank unit 3 , From a tank body 5 the tank unit 3 is a fuel line 7 brought out via a fuel pump 9 to an engine designed as a diesel engine 11 leads. From the internal combustion engine 11 out leads a fuel return line 13 directly into the tank body. In a diesel engine, since the fuel supplied to the diesel engine through injectors is not completely consumed, the unused fuel is supplied via a fuel return passage 13 the tank body 5 fed again.

In 2 is an embodiment of a tank unit according to the invention 3 represented as used in commercial vehicles. About the fuel line 7 is through the fuel pump 9 Fuel from a swirl pot 15 sucked, which at the bottom 17 of the shell 5 is arranged. Inside the tank body 5 is at the end 21 the fuel return line 13 a container 19 arranged, which of the fuel return line 13 recirculated residual volume of the fuel absorbs. The container 19 is also on the ground 17 of the shell 5 arranged, with the end 21 the fuel return line 13 in the fuel 23 dipping in the container 19 is stored. Preferably, the container 19 cup-shaped.

Through the fuel return line 13 becomes the inner volume of the container 19 always with fuel 23 kept filled. This is also the case when the fuel level 25 in the tank body 5 has reached the state "tank empty". This ends the end 21 the fuel return line 13 always below the fuel level 25 in the tank body 5 in that, in the container 19 stored fuel 23 , Thus, regardless of the state of the fuel level 25 in the tank body 5 always a residual volume in the container 19 maintained. Due to the height variations of the fuel 23 in the container 19 can be corresponding inclination angle, the tank unit 3 according to the movement of the motor vehicle 1 takes, be balanced.

Although the invention has been further illustrated and explained in detail by way of preferred embodiments, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention. It is therefore clear that a multitude of possible variations exists. It is also to be understood that exemplified embodiments are really only examples that are not to be construed in any way as limiting the scope, applicability, or configuration of the invention. Rather, the foregoing description and description of the figures enable one skilled in the art to practice the exemplary embodiments, and those skilled in the art, having the benefit of the disclosed inventive concept, can make various changes, for example, to the function or arrangement of individual elements recited in an exemplary embodiment, without Protection area defined by the claims and their legal equivalents, such as further explanations in the description.

LIST OF REFERENCE NUMBERS

1

motor vehicle

3

tank unit

5

shells

7

Fuel line

9

Fuel pump

11

internal combustion engine

13

Fuel return line

15

swirl pot

17

Bottom of the tank body

19

container

21

End of the fuel return line

23

Fuel in the tank

25

Fuel level

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102012015775 A1 [0002]

Claims (9)

Tank unit for a vehicle, preferably for a commercial vehicle, comprising a fuel-fillable tank body ( 5 ) from which a fuel line ( 7 ) is led out for the supply of fuel to an internal combustion engine ( 11 ) and a fuel return line ( 13 ), which are in the tank body ( 5 ), characterized in that the fuel return line ( 13 ) inside the shell ( 5 ) in a recirculated fuel ( 23 ) receiving containers ( 19 ) ends. Tank unit according to claim 1, characterized in that the fuel return line ( 13 ) below a fuel level ( 25 ) of the shell ( 5 ) in the container ( 19 ) ends. Tank unit according to claim 2, characterized in that the fuel return line ( 13 ) below the, an empty tank body ( 5 ) characterizing fuel level ( 25 ) of the shell ( 5 ) in the container ( 19 ) ends. Tank unit according to claim 1, 2 or 3, characterized in that the container ( 19 ) on one, the fuel return line ( 13 ) receiving side is designed open. Tank unit according to at least one of the preceding claims, characterized in that the container ( 19 ) on a floor ( 17 ) of the shell ( 5 ) is seated. Tank unit according to claim 5, characterized in that the ground ( 17 ) facing away from the container ( 19 ) is open. Tank unit according to one of the preceding claims, characterized in that the end ( 21 ) of the fuel return line ( 13 ) in, in the container ( 19 stored fuel ( 23 immersed). Tank unit according to at least one of the preceding claims, characterized in that the container ( 19 ) is cup-shaped. Vehicle comprising a tank unit ( 3 ), characterized in that the tank unit ( 3 ) is formed according to at least one of the preceding claims.

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