DE102014217625A1 - High-pressure fuel pump - Google Patents

Abstract

The invention relates to a high - pressure fuel pump (10) for pressurizing a fuel (22), comprising a fluid channel (46) for guiding a fluid, in particular a fuel (22), in the high - pressure fuel pump (10), wherein the fluid channel (46) a housing (14) of the high-pressure fuel pump (10) is formed, and a filter device (50) which is arranged in the fluid channel (46) and which has a filter surface (68) for separating particles present in the fluid, wherein the filter surface (68) has a curved filter surface area (70).

Description

The invention relates to a high-pressure fuel pump for pressurizing a fuel.

Such high pressure pumps are used to pressurize a fuel, such as diesel or gasoline, with high pressure so as to prevent the generation of undesirable combustion products. For example, gasoline is subjected to a pressure in the range of 200 bar-300 bar and diesel at a pressure in the range of 2000 bar-3000 bar.

These high-pressure fuel pumps are often designed as piston pumps, wherein a piston pressurizes the fuel in a pressure chamber by an up and down movement and wherein the piston is often driven by an eccentric mounted on a drive shaft.

It is known to supply fuel to the pressure chamber, for example via an inlet region of the high-pressure fuel pump, wherein the inlet region is arranged, for example, in a region of an eccentric chamber of the driving eccentric. In a flow path of the fuel of, for example, a fuel tank such as a tank to the pressure chamber usually a fuel filter is arranged, through which the fuel flows on its way to the pressure chamber, so as to be able to filter out unwanted particles from the fuel. For example, such fuel filters are provided in connection areas that connect the inlet area of the high-pressure fuel pump with the fuel tank. It is also known to accommodate such fuel filters in special housings when a large installation space is available.

Filter devices may also be arranged at further positions within a high-pressure fuel pump in order to filter fluids flowing in the high-pressure fuel pump, such as the named fuel, but also, for example, lubricating oil and thus prevent damage to elements of the high-pressure fuel pump by undesired particles in the corresponding fluid.

Due to the ever increasing optimization of internal combustion engines, especially in geometric terms, there is less space available, which must therefore be optimally utilized.

The object of the invention is therefore to propose a high-pressure fuel pump with a filter device that can make optimal use of an available space.

This object is achieved with a high-pressure fuel pump with the features of claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

A high-pressure fuel pump for pressurizing a fuel has a fluid passage for guiding a fluid, in particular a fuel, which is formed in a housing of the high-pressure fuel pump. Furthermore, a filter device is arranged in the fluid channel, which has a filter surface for separating particles present in the fluid. The filter surface has a curved filter surface area.

Previously known filter devices, in particular fuel filters, which are used in conjunction with high-pressure fuel pumps for filtering fuels or other fluids flowing in the high-pressure fuel pump, usually have a cylindrical geometry with a straight bottom. As a result, the tissue surface is limited, so that a relatively large filter device must be used to achieve a large filter volume, since the filter volume is directly proportional to the active filter surface of the filter device. The active filter area is determined by the straight floor.

In order to make optimal use of a geometrically limited space, the filter device has instead of just this straight bottom an active filter surface which has a curved filter surface area, whereby the active filter area is increased overall. Accordingly, a larger filter volume can be passed through the filter device than with filter devices with even active filter surfaces.

Preferably, the curved filter surface area is formed dome-shaped. "Dome-shaped" means a section through a three-dimensional body, in particular a dome-shaped training. For example, the curved filter surface area may have a shape corresponding to a hemisphere and thus be spherical.

Advantageously, the curved filter surface area has several indentations.

The more three-dimensional deformations, for example in the form of indentations, which has the active filter surface, the larger becomes the active filter surface available for filtering in relation to a flat filter surface. As a result, the volume to be filtered can preferably be increased even further. For example, the active filter surface can be deformed in such a way that initially formed a dome-shaped filter surface and this is subsequently provided with one or more indentations.

Preferably, the filter device has a filter holder, which defines a filter holder volume, wherein the filter surface area is formed in particular vaulted into the filter holder volume.

In order to save space in the enlargement of the active filter surface, the curved filter surface area is arched into the filter holder volume, d. H. in an interior of the filter device, and therefore requires only a space that is needed anyway for attaching the filter holder.

Due to the arched filter surface area, therefore, an increase in the active filter area can be achieved without having to increase the installation space of the filter device.

Advantageously, the filter holder has a cylindrical geometry, as a result of which the filter device can be accommodated particularly easily, for example, in a bore.

Advantageously, the filter holder has a fastening region for fastening the filter device in the fluid channel. Furthermore, the filter holder preferably has an end region opposite the fastening region and at least one side region. In this case, the active filter surface advantageously comprises a first filter surface region, which is arranged on the front side region, and a second filter surface region, which is arranged on the side region.

In this case, the convex filter surface region can advantageously at least partially form both the first filter surface region or the second filter surface region or both filter surface regions.

If the filter holder is designed such that it can be advantageously fastened in the fluid channel of the high-pressure fuel pump via the fastening region and thus accommodated, no additional fastening elements or supporting bodies are required in order to install the filter device in the system. Therefore, it is advantageously possible to provide a high-pressure fuel pump with a filter device integrated into the housing of the high-pressure fuel pump, which preferably leaves a user of the high-pressure fuel pump complete freedom via a connection method or via connecting devices to the high-pressure fuel pump.

In addition, it is advantageous if the active filter surface of the filter device not only in a bottom region, ie. H. is arranged in a front side region, which is opposite to the fastening region of the filter holder, but also in a side region of the filter holder, since thus preferably the active filter surface can be designed to the maximum.

Preferably, the filter device is arranged in an inlet bore of the high-pressure fuel pump. In this case, a feed nozzle for connecting the fluid channel to a fuel line is preferably arranged in the inlet bore separately from the filter device. The inlet spout therefore advantageously forms an exemplary connection method to connect the inlet bore with an external fuel tank. The inlet nozzle is preferably inserted into the inlet bore.

Characterized in that Zulauftülle and filter device are preferably formed separately from each other, a user of the high-pressure fuel pump is advantageously free in the geometric design of Zulauftülle and can mount the Zulauftülle advantageous example, under predetermined connection methods on a product line. The feed spout advantageously also does not act as a fastening element or supporting body for the filter device, so that no installation space for the filter device has to be provided in the inlet spout.

The filter device is preferably arranged downstream of the inlet nozzle, in particular in contact with the inlet nozzle, in the inlet bore. Preferably, the filter device is merely inserted into the inlet bore, being supported by the inlet nozzle in the inlet bore. As a result, the Zulauftülle advantageously only be plugged from the outside to the high-pressure fuel pump, without having to take into account that the filter device must also be accommodated somewhere.

If the filter device is advantageously in direct contact with the feed nozzle, supplied fuel is advantageously filtered in this contact region before it enters the interior of the high-pressure fuel pump.

Preferably, the inlet bore of the high-pressure fuel pump is designed so that it connects an eccentric chamber of the high-pressure fuel pump with an environment in which there is a fuel line, via which fuel is to be supplied to the high-pressure fuel pump. The filter holder volume of the filter holder, ie an inner volume of the filter holder, is advantageously arranged so that it directly adjoins an inlet channel which is formed in the inlet nozzle. In this case, an opening of the filter device to the adjacent Zulauftülle is preferably greater than a diameter of the inlet channel in the connector grommet. Thus, supplied fuel can advantageously be conducted lossless directly from the inlet channel into the filter holder volume and thus over the active filter surface.

Advantageously, the inlet bore downstream of the filter device is designed to widen conically. As a result, the medium to be filtered, such as fuel, preferably a better flow through the filter device allows.

Advantageously, the filter holder has a first ring arranged on the end face for fastening the first filter surface area and a second ring formed in the fastening area for fastening the filter device in the inlet bore, wherein the second ring has a larger diameter than the first ring, and wherein the first Ring and the second ring are connected to each other via extending in the longitudinal direction of the filter holder webs.

Preferably, the second ring of the filter holder on a rotation, which advantageously prevents twisting of the filter device in the inlet bore.

If the inlet bore preferably additionally has a projection for interacting with the second ring, the filter device can advantageously be arranged secured exclusively by the formation of the second ring on the filter holder in the inlet bore.

In particular, the projection is arranged on a directed to an eccentric chamber of the high-pressure fuel pump end of the inlet bore. In order for the projection advantageously prevents slippage of the filter device from the inlet bore into the eccentric and it is simultaneously created in the inlet hole space for a connection, such as a Zulauftülle that can be inserted into the inlet bore.

Advantageously, the active filter surface is formed from a metal fabric or from a plastic fabric. Alternatively, it is also possible to use a filter material which has small filter element openings for the passage of the fuel instead of fabric mesh made of metal or plastic.

The active filter surface may also be partially formed of metal fabric and partially made of plastic fabric, depending on the requirements of the respective filter surface area. For example, the convex filter surface region may be formed in particular of metal, while a filter surface region in the region of the side region of the filter holder may be formed from plastic or vice versa.

Advantageous embodiments of the invention will be explained in more detail with reference to the accompanying drawings.

It shows:

1 a longitudinal sectional view of a high-pressure fuel pump with a filter device with a vaulted filter surface area;

2 a sectional view of an inlet bore of the high-pressure fuel pump 1 in which the filter device is arranged together with a feed spout;

3 a perspective view of the filter device 2 ;

4 a longitudinal sectional view of the filter device 2 ; and

5 a longitudinal sectional view of an alternative embodiment of the filter device.

1 shows a high-pressure fuel pump 10 holding a cylinder head 12 which is in a housing 14 is inserted. In the cylinder head 12 is a cavity 16 provided in which a piston 18 is guided by an up and down movement in a pressure chamber 20 arranged fuel 22 can apply pressure.

The piston 18 is driven by a roller tappet 24 that has a role 26 in operative connection with an eccentric 28 on a drive shaft 30 stands.

The piston 18 is about a spring 32 , which are at a bottom 34 of the cylinder head 12 and at one on the roller tappet 24 attached spring plate 36 supports, in the direction of the drive shaft 30 biased.

Upon rotation of the drive shaft 30 becomes the role 26 on an outside surface 38 the drive shaft 30 unwinds, moves up and down and transmits this translational movement on the piston 18 , which in turn by the translational movement a pressure in the pressure chamber 20 builds.

The fuel 22 becomes the pressure room 20 via a supply line 40 supplied via a connecting channel 42 with an eccentric room 44 is connected, in which the drive shaft 30 is stored.

Via a fluid channel 46 becomes the fuel 22 to the eccentric room 44 fed. For this purpose, the housing 14 an inlet hole 48 on that the eccentric space 44 with an environment 49 the high-pressure fuel pump 10 combines.

To the high-pressure fuel pump 10 to protect against damage is supplied fuel 22 filtered, so that unwanted particles from the fuel 22 can be filtered out.

For this purpose, in the embodiment shown is a filter device 50 in the fluid channel 46 the inlet hole 48 arranged. It is also possible to have a corresponding filter device 50 at other positions in the housing 14 the high-pressure fuel pump 10 to arrange, for example, in the connection channel 42 or in the supply line 40 both of which are also fluid channels 46 form. Other fluids such as lubricating oil can through this filter device 50 be filtered when positioned at an appropriate location.

In the embodiment shown is for supplying the fuel 22 from a fuel tank, not shown, in the inlet bore 48 a feed spout 52 plugged in, as a connecting element 54 acts. In the inlet nozzle 52 is an inlet channel 56 provided over which the fuel 22 in the filter device 50 arrives.

An opening 58 the filter device 50 is larger than a diameter 60 of the inlet channel 56 and thus enables a lossless supply of fuel 22 in the filter device 50 ,

For this reason, the inlet nozzle 52 also directly adjacent to the filter device 50 and in contact with this in the inlet bore 58 arranged. Nevertheless, filters are 50 and inlet nozzle 52 two separate elements, so that the filter device 50 just already in the inlet hole 48 can be arranged and secured without the inlet spout 52 already at the high-pressure fuel pump 10 is attached. In the present embodiment, the filter device 50 just into the inlet hole 58 plugged in and is from the inlet nozzle 52 against slipping out of the case 14 secured. This represents a connection element 54 , For example, the inlet nozzle 52 , more degrees of freedom available than when filter device 40 and inlet nozzle 52 would be integrally formed.

The filter device 50 is downstream of the feed spout 52 arranged so that the inlet nozzle 52 just into the inlet hole 48 can be inserted, where already the filter device 50 can be attached.

To the filter device 50 in the inlet hole 48 to secure, without having to provide additional fasteners, or the filter device 50 with the inlet nozzle 52 to support or to fix it, has the inlet bore 48 a lead 62 on, on which the filter device 50 is held. Downstream of the filter device 50 expands the inlet hole 48 conical, so as the fuel 22 a better flow to the eccentric space 44 to enable.

2 shows a more detailed view of the fluid channel 46 with filter device 50 and inlet nozzle 52 ,

The filter device 50 has a filter holder 64 with a filter holder volume 66 as well as with an active filter surface 68 on.

As in 2 is the active filter area in the present embodiment 68 into the filter holder volume 66 formed vaulted and thus has a vaulted filter surface area 70 on.

This will be the one for filtering the fuel 22 available filter surface 86 enlarged, but without claiming further space, since the enlargement of the filter surface 68 by arching into the filter holder volume 66 takes place, anyway for fixing the filter device 50 is needed. Depending on the available installation space, the filter area can be 70 be curved in another direction, z. B. be formed bulging.

3 and 4 show detailed views of the filter device 50 ,

Out 3 it can be seen that the filter holder 64 a mounting area 62 and one the attachment area 72 opposite end face area 74 having. Between attachment area 72 and frontal area 74 is a page area 76 intended. Both in the front area 74 is a filter material 78 arranged as well as in the side area 76 , This is a first filter surface area 80 in the frontal area 74 the filter device 50 and a second filter surface area 82 in the page area 76 the filter device 50 educated.

To the filter material 78 to support, has the filter holder 64 at the frontal area 74 a first ring 84 on, at which the first filter surface area 80 is attached. In the attachment area 72 has the filter holder 64 a second ring 86 on, the larger diameter 88 has as the first ring 84 , and with that the filter device 50 in the inlet hole 48 is held securely. To stabilize the filter device 50 are webs 90 provided the first ring 84 and the second ring 86 connect with each other.

filter material 78 is in all areas between the rings 84 . 86 and the jetties 90 arranged so as to have the largest possible active filter area 68 to obtain.

As if from a synopsis 3 and 2 shows, the second ring acts 86 along with the lead 62 in the inlet hole 48 and thus keeps the filter device 50 in the inlet hole 48 so that these are not in the eccentric space 44 can slip through.

To insert the inlet nozzle 52 as far as possible into the inlet bore 48 to allow in is the lead 62 that the filter device 50 stops, at one end 92 the inlet hole 48 arranged adjacent to the eccentric space 44 lies.

From a synopsis 2 and 4 shows that the active filter area 86 in the frontal area 74 the vaulted filter surface area 70 having. This is in the embodiment according to 4 dome-shaped, in particular with a spherical shape.

Alternatively, such as in 5 shown, the vaulted filter surface area 70 but also one or more indentations 94 have the active filter surface 68 continue to enlarge.

In addition, the active filter surface 68 in the page area 76 with indentations 94 be formed to the filter surface 68 to enlarge. However, this is only an optimal design.

As filter materials 78 can metal mesh 96 or plastic fabric 98 However, it is also possible to use both filter materials 78 in a filter device 50 to use together.

Overall, by the filter device 50 opened a possibility in the high-pressure fuel pump 10 flowing fluids, for example via a fuel line 100 supplied fuel 22 to filter, with a compared to ordinary cylindrical filter surfaces 68 enlarged active filter area 68 without, however, claiming a larger space.

LIST OF REFERENCE NUMBERS

10

 High-pressure fuel pump

12

 cylinder head

14

 casing

16

 cavity

18

 piston

20

 pressure chamber

22

 fuel

24

 roller plunger

26

 role

28

 eccentric

30

 drive shaft

32

 feather

34

 bottom

36

 spring plate

38

 outer surface

40

 supply line

42

 connecting channel

44

 cam chamber

46

 fluid channel

48

 inlet bore

49

 Surroundings

50

 filtering device

52

 spout inlet

54

 connecting element

56

 inlet channel

58

 opening

60

 diameter

64

 filter holder

66

 Filter holder volume

68

 filter area

70

 vaulted filter surface area

72

 fastening area

74

 Front side area

76

 page range

78

 filter material

80

 first filter surface area

82

 second filter surface area

84

 first ring

86

 second ring

88

 diameter

90

 web

92

 The End

94

 indentation

96

 metal mesh

98

 Plastic fabric

100

Fuel line

Claims (11)

High-pressure fuel pump ( 10 ) for applying a fuel ( 22 ) with pressure, comprising - a fluid channel ( 46 ) for guiding a fluid, in particular a fuel ( 22 ), in the high-pressure fuel pump ( 10 ), wherein the fluid channel ( 46 ) in a housing ( 14 ) of the high-pressure fuel pump ( 10 ) is trained, A filter device ( 50 ), which in the fluid channel ( 46 ), and the one filter surface ( 68 ) for separating particles present in the fluid, wherein the filter surface ( 68 ) a curved filter surface area ( 70 ) having. High-pressure fuel pump ( 10 ) according to claim 1, characterized in that the curved filter surface area ( 70 ) is dome-shaped, in particular spherical. High-pressure fuel pump ( 10 ) according to one of claims 1 or 2, characterized in that the curved filter surface area ( 70 ) several indentations ( 94 ) having. High-pressure fuel pump ( 10 ) according to one of claims 1 to 3, characterized in that the filter device ( 50 ) a filter holder ( 64 ) having a filter holder volume ( 66 ), where the filter surface area ( 70 ) in particular into the filter holder volume ( 66 ) is formed vaulted. High-pressure fuel pump ( 10 ) according to one of claims 1 to 4, characterized in that the filter holder ( 64 ) a fastening area ( 72 ) for fixing the filter device ( 50 ) in the fluid channel ( 46 ), one the attachment area ( 72 ) opposite end face region ( 74 ) and at least one page area ( 76 ), wherein the filter surface ( 68 ) a first filter surface area ( 80 ), which at the front side area ( 74 ) and a second filter surface area ( 82 ) located on the side area ( 76 ), wherein the curved filter surface area ( 70 ) the first filter surface area ( 80 ) and / or the second filter surface area ( 82 ) at least partially forms. High-pressure fuel pump ( 10 ) according to one of claims 1 to 5, characterized in that the filter device ( 50 ) in an inlet bore ( 48 ) of the high-pressure fuel pump ( 10 ) is arranged, wherein in particular in the inlet bore ( 48 ) separated from the filter device ( 50 ) an inlet nozzle ( 52 ) for connecting the fluid channel ( 46 ) with a fuel line ( 100 ) is arranged High-pressure fuel pump ( 10 ) according to claim 6, characterized in that the filter device ( 50 ) downstream of the feed spout ( 52 ), in particular in contact with the feed spout ( 52 ), in the inlet bore ( 48 ) is arranged. High-pressure fuel pump ( 10 ) according to claim 7, characterized in that the filter device ( 50 ) into the inlet bore ( 48 ) is inserted, the filter device ( 50 ) in particular by the feed spout ( 52 ) in the inlet bore ( 48 ) is held. High-pressure fuel pump ( 10 ) according to one of claims 6 to 9, characterized in that the inlet bore ( 48 ) downstream of the filter device ( 50 ) is conically widening. High-pressure fuel pump ( 10 ) According to one of claims 6 to 9, characterized in that the filter holder ( 64 ) one on the front side area ( 74 ) arranged first ring ( 84 ) for fixing the first filter surface area ( 80 ) and one in the attachment area ( 72 ) formed second ring ( 86 ) for fixing the filter device ( 50 ) in the inlet bore ( 48 ) having a larger diameter ( 60 ) than the first ring ( 84 ), the first ring ( 84 ) and the second ring ( 86 ) over in the longitudinal direction of the filter holder ( 64 ) running webs ( 90 ) are interconnected. High-pressure fuel pump ( 10 ) according to claim 10, characterized in that the inlet bore ( 48 ) a projection for cooperation with the second ring ( 86 ), which in particular at one to an eccentric space ( 44 ) of the high-pressure fuel pump ( 10 ) directed end of the inlet bore ( 48 ) is arranged.

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