JPH07189974A - Device for supplying internal combustion engine for automobile with fuel from storage tank - Google Patents

Abstract

PURPOSE: To uniformly execute centering of an impeller to prevent the impeller from slanting by arranging pocket-shaped cutouts formed on the end walls of a pump chamber and forming a hydraulic pressure part wedge-likely acting on the end face of the impeller along the circumferential direction of the impeller at regular intervals. CONSTITUTION: This feed device 1 is provided with a feed pump 3 as a fluid pump, and in this an impeller 4 having blades 9 is rotated in a pump chamber 13. Hereat, the respective end walls 21 of the pump chamber 13 are formed with pocket-shaped cutouts 31, and by filling them with fuel. A hydraulic pressure part wedge-likely acting on the end face of the impeller 4 is formed. In this case, the cutouts 31 are arranged on the common peripheral faces 32 holding spaces from each other. The pressure range 39 of the cutouts 31 ranges the wedge shaped hydraulic pressure part in the circumferential direction of the impeller 4 between the impeller 4 and the respective end walls 21. Meanwhile, the cross-section of the pressure range 39 is reduced in the rotational direction of the impeller 4. Namely, the cutouts 31 are uniformly arranged in the circumferential direction of the impeller 4. And centering of the impeller is uniformly executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying fuel from a storage tank to an internal combustion engine of a motor vehicle, which is provided with a feed pump configured as a fluid pump, which rotationally drives the feed pump. A disk-shaped impeller to rotate in a cylindrical pump chamber, the impeller having a radially outwardly directed vane rim, the pump chamber being the axis of the impeller. Is limited by two end walls facing each other in the direction and by an annular wall in the circumferential direction, and extends within the two end walls at the height of the impeller blades around the axis of rotation of the impeller. A ring-shaped groove is arranged, and the groove forms a pumping passage together with the impeller, and the pumping passage extends from the intake port at one end to the extraction port at the other end. A pocket-shaped notch is provided in the end wall of the pump chamber that communicates with the mouth, and the notch is filled with fuel during operation of the feed pump and acts on the end surface of the impeller in a wedge-shaped axial direction. Relates to the type in which the parts are intended to be formed.

[0002]

2. Description of the Prior Art In a feed device of the type described above, which is known from DE 32 26 325 A1, an electric drive motor rotates an impeller of a feed pump configured as a fluid pump. It is designed to drive. A large number of blades, which are directed outward in the radial direction, are arranged on the outer peripheral portion of the disk-shaped impeller, and the impeller rotates in a cylindrical pump chamber. The pump chamber is bounded in the axial direction of the impeller by two end walls facing each other and in the radial direction by an annular wall. On the end wall in the axial direction of the pump chamber, one groove is provided at the blade height position and extends in a partial ring shape around the rotation axis of the impeller. Is forming. This pumping passage extends from the intake port provided at one end to the extraction port provided at the other end, and during the rotational movement of the impeller, fuel is sucked in through the intake port and the extraction port is opened. High-pressure fuel is discharged via the. In this case, if the axial gap between the impeller and the end wall of the pump chamber is small, the flow-limited pressure is asymmetric, causing the impeller to tilt and contact the wall, which results in high wear and wear. In order to avoid noise generation, the known feed device is provided with a plurality of pocket-shaped notches in the end wall of the pump chamber. These notches are filled with fuel during the rotational movement of the impeller, so that a wedge-shaped hydraulic portion is formed between the impeller and the axial end wall of the pump chamber.
Five notches are preferably arranged in the end wall as follows. That is, these notches fill the fuel from the inner chamber of the impeller shaft on the low pressure side of the pumping passage extending from the intake port to almost the center of the pumping passage, and also on the pressure side extending from the center of the pumping passage to the range of the outlet. Is arranged so that the fuel is filled from the pumping passage. in this case,
The cross section of these cutouts is gradually smaller from the filling opening in the axial direction of the impeller.

[0003]

However, in such a known feed device, the pump-shaped notches are arranged asymmetrically, so that the notches are optimized in accordance with various feed pumps and operating conditions. It has to be expensive to put it in position,
In order to fill the notch between the end wall and the impeller, it is almost impossible to use the original flow energy of the recirculating fuel, so that a portion having sufficient wedge-shaped hydrodynamic action (hydraulic portion) should be formed. There is a drawback that you cannot do it.

Moreover, in the known feed device,
The notch on the pressure side is adapted to be filled directly from the pumping passage, which adversely affects the feed characteristics of the feed pump. The object of the present invention is therefore to eliminate the disadvantages of such known devices.

[0005]

According to the present invention, which solves this problem, the pocket-shaped notches are arranged on the common peripheral surface in the circumferential direction substantially at regular intervals from each other. And a pressure wall of a pocket-shaped notch forming a wedge-shaped hydraulic portion between the end wall and the end wall are aligned in the circumferential direction of the impeller, and the cross section of this pressure range is
It is reduced in the direction of rotation of the impeller.

[0006]

In the feed device of the present invention, the impeller can be centered uniformly by uniformly disposing the pocket-shaped notches in the circumferential direction of the impeller, so that the impeller can be surely prevented from tilting. Have advantages. In this case, such a pocket-shaped notch arrangement can be used for different fluid pumps without costly adaptation work. because,
The effective wedge-shaped hydraulic section between the impeller and the end wall of the pump chamber is formed by the fuel flow rotating with the impeller, so that filling the notch with fuel results in an axial gap between the impeller and the end wall. This is because it is performed independently of the flow characteristics that differ for each pump. Reliable filling of the notches with fuel is advantageous in that it is obtained by aligning the end regions of the pressure build-up with the direction of travel of the impeller, whereby the direction of movement of the impeller or of the fuel flow is such that the fuel is fed into the notches. The pocket notch acts as a hydrodynamic bearing, as it is used for filling and for creating pressure in this end region.

In the illustrated embodiment, a uniform arrangement of the pocket-shaped cutouts is obtained by the cutouts extending from a common circumference and being equally spaced from one another. However, in the cutouts oriented in different directions, it is also possible to arrange the end regions of the cutout, which form the pressure, on a common circumference.

Another advantage of the present invention is obtained by aligning the notches facing each other on the pressure and suction sides of the pumping passage. In this case, the flow characteristics of the leak flow are utilized in an advantageous manner to assist the operation of filling the notches with fuel.

The webs in the end wall of the pump chamber, which remain between the pumping passages and the pocket-shaped notches, also influence the feed characteristics of the fluid pump and thus of the feed device in an advantageous manner.

If the inner wall of the pump chamber located radially inward is always filled with the fuel due to the recess formed in the end wall of the pocket-shaped notch, the pocket is formed in the end wall of the pump chamber. Instead of arranging the notches as described above, it is also possible to arrange these notches on the axial end surface of the impeller.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an apparatus according to the present invention for supplying fuel from a storage tank to an internal combustion engine will be described in detail with reference to the two embodiments shown in the drawings.

FIG. 1 is a partial view of a feed device provided in a fuel tank (not shown). This feed device also supplies fuel from a storage tank via a feed line to an internal combustion engine of a motor vehicle, which is also not shown.

For this purpose, the feed device 1 has a feed pump 3 which is constructed as a fluid pump. The impeller 4 of the feed pump 3, which functions as a feed member, is rotationally driven via a rotor shaft 8 by an electric drive motor 7 arranged in a common casing 5 together with the feed pump 3.

The disc-shaped impeller 4 connected to the drive motor 7 through the rotor shaft 9 has an outer peripheral portion,
Having a rim of vanes 9 directed radially outward,
These vanes 9 are connected to each other by a ring 11 which surrounds the impeller 4 in the radial direction in the illustrated embodiment. The impeller 4 is arranged in a cylindrical pump chamber 13, which in the axial direction of the impeller 4 is limited by two end walls facing each other and in the circumferential direction by an annular wall. ing. The first end wall 21 of the pump chamber 13 is arranged on the suction cover 17 of the feed device 1 with the suction sleeve 15, and the second end wall 23 of the feed device 3 in the direction towards the drive motor 7. It is arranged on the limiting intermediate member 19.

Impellers 4 are provided on the end walls 21 and 23, respectively.
A groove 24 extending in a partial ring shape around the rotation axis of the impeller 4 is provided at the height position of the blade 9. These grooves 24 form a pressure feed passage 25 together with the impeller 4, and the pressure feed passage 25 is connected to the suction sleeve 15 provided at the suction cover 17 at one end side from the intake port 27 to the intermediate member 19. Is connected to the outlet 29. The position of the groove 24 and the position of the inlet port or the outlet port 29 in the end walls 21 and 23 are
It is shown in FIGS. 2 and 3 which is a cross-section of FIG. In order to obtain axial stability of the impeller 4, the end walls 21 and 23 are provided with pocket-shaped notches 31.
1 are symmetrically opposed to each other and have the same interval. In the first embodiment, these pocket-shaped notches 31 are directed outward in the radial direction on the suction side 33 that extends in the circumferential direction from the intake port 27 to almost the center of the pressure-feeding passage 25, and the notch 31 of the pressure-feeding passage 25 is formed. On the pressure side 35, which extends from the center beyond the extent of the outlet 29, it is directed radially inward.

The shape of the pocket-shaped notch 31 is shown in FIGS. 4 and 5. In FIGS. 4 and 5, each one of the notches 31 having the same shape is enlarged and shown in a state viewed from two directions. The notch 31 has two partial areas, and a first partial area of the two partial areas, which forms the intake area 37, is an acute angle from the peripheral surface 32, and is the rotational movement direction of the impeller 4. A second range, which extends into and which adjoins the intake range 37 and forms the pressure range 39, is oriented substantially parallel to the direction of rotation of the impeller 4 via the newly bent transition. There is. The depth of the pocket-shaped notch 31 is gradually increased toward the pressure range 39 in the intake range 37, but the depth of the transition between the end faces of the end walls 21 and 23 and the intake range 37 of the peripheral surface 32 is increased. It may be configured as a step.
The cross-sectional shape of the pressure range 39 of the notch 31, which is used to form a wedge-shaped pressure between the end walls 21 and 23 and the impeller 4, is a cross-sectional view taken along the line C-C (a in FIG. 4). ) And D
It is shown in a sectional view along line -D (b in Fig. 5). In this cross-sectional view, the depth of the notch 31 in the pressure range 39 gradually decreases toward the impeller, so that its cross section gradually decreases from the size of the intake range 37.

The structure of the second embodiment shown in FIGS. 6 to 8 is as follows:
Since the structure of the first embodiment shown in FIGS. 1 to 5 is the same as that of the first embodiment except for the pocket-shaped notch 31, the description will be given below.
It is limited only to the arrangement of the pocket-shaped notch 31 in the end walls 21 and 23 of the pump chamber 13. In the same part,
The same reference numerals as those used in FIGS. 1 to 5 are used.

The end walls 21, 23 of the second embodiment have an annular recess 43 extending from the inner chamber 41 surrounding the rotor shaft 8 of the drive motor 7 in the pump chamber 13, and the radius of this recess 43. The end directed outwards in the direction is adjacent to the end faces of the end walls 21, 23 which receive the groove 24 via a circular step forming an annular edge 45, so that the inner chamber 4
The fuel present in 1 reaches the recess 43. Interior 41
Through the connection line (not shown)
9 is connected to the inside of the casing 5 of the feed device 1, which is adjacent to 9, and in this case it is also possible to provide a fuel outlet in the bearing 47 which guides the rotor shaft 8. High-pressure fuel is continuously supplied from the casing portion receiving the drive motor 7 into the inner chamber 41 and the recess 43 via the fuel discharge portion.

In this second embodiment, the notch 3 having the same structure as the piston-shaped notch 31 shown in FIGS. 4 and 5.
1 all extend in the same direction, extending from the annular edge 45 in the impeller direction, the intake range 37 extends directly from the recess 43, and like the first embodiment, the pressure range over a predetermined angle. 39, whose cross section decreases in the impeller direction as its depth decreases.

In this case, in two embodiments, the end wall 2
Since the web remains between the ends of the pocket-shaped notches 31 provided in the Nos. 1 and 23 in the radially outward direction, it adversely affects the circulation of the fuel in the pumping passage 25. There is no such thing.

The working mode of the feed device according to the present invention is as follows.

The impeller 4 rotatably driven by the electric drive motor 7 sucks the fuel from the storage tank into the pressure feeding passage 25 through the suction sleeve 15 and the intake port 27. Here, the fuel accelerated by the impeller and the pressure feeding passage 2
The fuel pressure is increased while flowing through in the direction towards the outlet 29 on the basis of the pulse exchange with the fuel flowing through in the casing 5, whereby the fuel is at high pressure via the outlet 29 in the casing 5 It penetrates into and flows here along the drive motor 7 to a pressure connection (not shown) provided on the casing 5. A feed line leading to the internal combustion engine is connected to this pressure connection. During the fuel feed, leakage occurs from the pumping passage 25 via the axial gap between the impeller 4 and the end walls 21,23. This leakage is replaced by the tensile flow in the impeller direction by the rotation of the impeller 4. In this case, especially on the pressure side 35
In, the fuel exits the feed passage 25 and flows in the direction toward the suction side 33. Such a flow condition in the axial gap ensures that the pocket-shaped notch 31 in the first embodiment is filled with fuel, and in this case, the cross-section of the pressure range 39 is reduced to increase the pressure. Is formed, thereby forming a hydraulic wedge-shaped pressure that axially loads the impeller 4, which is based on the fact that the cutouts 31 are symmetrically facing each other in the end walls 21, 23. Acts to center the impeller. The hydrodynamic bearing action is such that the circulating tensile flow of the leaked fuel causes the pressure range 39 of the notch 31 directed in the impeller direction.
It is assisted by this tensile flow by flowing along. In the second embodiment shown in FIGS. 6 to 8, the pocket-shaped notch 31 is directly filled with the fuel supplied under high pressure. From the inside of the casing on the drive side, this fuel reaches into the inner chamber 41 and the recess 43, and further into the pocket-shaped notch 31, where it acts as a hydrodynamic bearing.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a portion having a fluid pump of a feed device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

4A is an enlarged sectional view of a pocket-shaped notch provided in the end wall shown in FIG. 2, and FIG. 4B is a sectional view taken along line CC of FIG. 4A). It is a figure.

5A is an enlarged cross-sectional view of a pocket-shaped notch provided in the end wall shown in FIG. 3, and FIG. 5B is a) of FIG.
FIG. 6 is a cross-sectional view taken along the line D-D in FIG.

FIG. 6 is a partial cross-sectional view of a portion having a fluid pocket of the feeding device according to the second embodiment of the present invention.

7 is a cross-sectional view taken along the line AA of FIG.

FIG. 8 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

1 feed device, 3 feed pump, 4 impeller, 5 casing, 7 drive motor, 8 rotor shaft, 9 blades, 11 ring, 13 pump chamber, 15 suction sleeve, 17 suction cover, 19 intermediate member, 21, 23 end wall, 24
Groove, 25 pumping passage, 27 intake, 29
Outlet, 31 notch, 32 inner or outer circumference, 33 suction side, 35 pressure side, 37 take-out range, 39 pressure range, 41 inner chamber, 43 recess, 45 annular edge, 47 bearing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Paul Kirschbaum Federal Republic of Germany Esen Ulrichstraße 11 (72) Inventor Dietmar Schmieder Federal Republic of Germany Meklingen Wiesenweg 60 (72) Inventor Willistrol Beilstein of the Federal Republic of Germany Riesling Strasse 13

Claims (8)

[Claims] 1. A device for supplying fuel from a storage tank to an internal combustion engine of a motor vehicle, comprising a feed pump (3) configured as a fluid pump, wherein the feed pump (3) is rotationally driven. A disk-shaped impeller (4) to be rotated is adapted to rotate in a cylindrical pump chamber (13), which impeller (4) drives the rim of the vanes (9) directed radially outward. And has the pump chamber (13) limited by two end walls (21, 23) facing each other in the axial direction of the impeller (4) and by an annular wall in the circumferential direction. A partial ring-shaped groove (24) extending around the rotation axis of the impeller (4) is arranged at the height position of the blades (9) of the impeller (4) in one of the end walls (21, 23). ,
The groove (24), together with the impeller (4), provides a pressure passage (2
5), and the pumping passage (25) communicates with the intake port (27) at one end of the pumping passage (25) to the extraction port (29) at the other end of the pump chamber (13). Wall (2
1, 23) are provided with pocket-shaped notches (31), which are filled with fuel during operation of the feed pump (3) and are axially arranged on the end face of the impeller (4). In the type in which a wedge-shaped hydraulic portion is formed, pocket-shaped notches (31) are circumferentially spaced from each other on a common peripheral surface (32) in a substantially regular manner. And a pocket-shaped notch (3) that forms a wedge-shaped hydraulic portion between the impeller (4) and the end walls (21, 23).
The pressure ranges (1) of 1) are each aligned in the circumferential direction of the impeller (4) and the cross section of this pressure range (39) is reduced in the direction of rotation of the impeller (4). A device for supplying fuel from a storage tank to an internal combustion engine of a vehicle. 2. A pocket-shaped notch (31) is provided in the end wall (21, 23) of the pump chamber (13).
Device according to claim 1, characterized in that there is left a web extending radially outwardly between the pump and the pumping passage (25). 3. The pocket-shaped notch (31) has two ranges bent into one another, the first of these two ranges being the intake range (37) for the incoming fuel. ) Is formed, and the second range is the pressure range (3
Device according to claim 1 or 2, forming 9). 4. The dimension of the cutout (31) in the intake area (37) in the direction perpendicular to the end walls (21, 23) is such that it extends from the peripheral surface (32) to the pressure range (39). The device of claim 3, wherein the device is progressively larger. 5. Intake range (37) for the notch (31)
At the end opposite the pressure range (39) at the end wall (2
4. Device according to claim 3, characterized in that it has a step extending at right angles to 1, 2 3) and further from here to a pressure range (39) with a uniform cross section. 6. Intake range (37) for the notch (31)
Device according to any one of claims 1 to 5, wherein is bent at an angle of 45 ° to the pressure range (39). 7. A peripheral surface (32) in the range of a suction side (33) formed in the circumferential direction between a pocket-shaped notch (31) and the inlet (27) and the center of the pumping passage (25). ) Extending radially outwardly from the pumping passage (2
5) is directed radially inward to the pressure side (35) formed in the area of the outlet (29) between the centers of
Device according to any one of claims 1 to 6. 8. End walls (21, 23) of the pump chamber (13)
Has an annular recess (43) extending from the fuel-filled inner chamber (41), the radially outward end of the recess (43) receiving the groove (24). To do
Forming respectively one annular edge (45) directed towards the end faces of the end walls (21, 23), a pocket-shaped notch (31) is provided radially outward from said annular edge (45). One of claims 1 to 6, extending towards
The device according to the item.