JPH09242642A - Fuel supplying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate specific work for discharging leakage oil by arranging a pipe piece penetrated on a cylinder head, and arranging a device for discharging leakage oil on a pipe piece, in a device for leading fuel supplied to the high pressure leading pipe of the pipe piece into a radial direction formed on the valve holding body of a fuel injection valve. SOLUTION: In a cylinder head 1, a fuel injection valve including a valve holding body 5 is inserted and attached on a hole 3 opened to a combustion chamber, a penetrating hole 11 is formed on the cylinder head 1 positioning concentrically with a seat surface 9 formed on the flow-out opening port of the radial direction hole 7 of the valve holding body 5. The shaft extending part 15 of the pipe piece 13 is fitted in the penetrating hole 11, the seal surface 17 of the tip end thereof is pressed against a seat surface 9. A high pressure leading pipe 19 is formed on the pipe piece 13 so as to penetrate the pipe piece 13, and fuel is led from a high pressure connecting part 33. A leakage oil chamber 25 is formed between the circumferential wall of the pipe piece 13 and the wall of the penetrating hole 11, and leakage oil received in the oil chamber 25 is discharged from a leakage oil hole 47.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device, and more particularly to a fuel supply device for a fuel injection valve inserted in a cylinder head of an internal combustion engine, in which a pipe piece penetrating a penetrating portion of the cylinder head is provided. And the tubing has a high pressure connection at the supply end of the high pressure conduit,
It relates to a type in which the sealing surface on the outflow side is axially clamped against the conical seat surface of the supply of the valve holder of the fuel injection valve.

[0002]

2. Description of the Prior Art A fuel supply device of this type, known from EP 0 569 727, is
It has a pipe piece, and this pipe piece projects into the penetrating portion of the cylinder head. In this case, the pipe piece has a high-pressure connection at the supply-side end of the high-pressure hole or the high-pressure conduit, to which a high-pressure source, for example a high-pressure conduit extending from the injection pump, can be connected. The tube piece has a sealing surface at the end on the outflow side, with which the tube piece is axially clamped against the conical seat surface of the holding body of the fuel injection valve.

In this case, the known pipe piece is clamped against the fuel injection valve by means of a cap nut, which surrounds the pipe piece and is screwed into a through hole in the cylinder head. A high pressure conduit is connected to the high pressure connection using another cap nut at the end of the pipe piece on the supply side that projects axially from the through hole of the cylinder head. Leakage oil discharge from a leak oil chamber formed between the shaft of the pipe piece and the wall of the through hole of the cylinder head, which surrounds the pipe shaft, causes additional oil leakage in the cylinder head in a manner not shown. Done through a hole.

The known fuel supply system thus has the disadvantage of additionally processing the cylinder head in order to drain the leaked oil, which leads to high production costs. Furthermore, the axial connection of the high-pressure conduit requires a large geometrically determined structural space in the fueled internal combustion engine. However, the structural space available in today's internal combustion engines is limited.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is therefore to improve a fuel supply device of the type mentioned at the outset such that the cylinder head does not have to be additionally machined in order to drain the leaked oil, yet it is mounted. To provide a fuel supply system which requires only a small construction space.

[0006]

In order to solve this problem, in the structure of the present invention, the pipe piece is provided with a device for discharging the leaked oil.

[0007]

The fuel supply device according to the present invention thus constructed has the following advantages over known devices. That is, in the fuel supply device according to the present invention, since the device for discharging the leaked oil is integrally incorporated in the pipe piece, additional holes and connecting portions in the cylinder head can be omitted. Further, the leak oil hole extending outward from the leak oil chamber between the pipe piece and the through hole can be structurally simply provided, and the leak oil hole is opened in the leak oil connection pipe piece in the pipe piece. Which may be configured as a leaking oil connection tubing or as a threaded connection tubing.

In order to obtain a space for the leaking oil connecting piece, in a preferred embodiment of the invention, the part of the piece of the supply side which extends from the through hole in the cylinder head is bent so that it is bent. Moreover, a great deal of flexibility regarding the connections and mounting positions of the high-pressure conduit is obtained. The connecting piece of the leak oil hole is in this case inserted into the bent part of the piece of pipe in the axial extension of the leak oil hole and thus the additional transverse hole. Alternatively, it is not necessary to provide something similar to this for guiding the leak oil hole to the outside.

Another advantage of the present invention is obtained by providing the fixing flange with tongues that project radially from the tube. In this case, the tongue is provided with a receiving hole for receiving the fixing screw, and via this fixing screw the tube piece is axially clamped to the cylinder head. In this case, the pipe piece is a sealing surface provided at the end portion on the outflow side, which is in contact with the seat surface of the holding body of the fuel injection valve with a sealing action, and is a spherical or curved seal of the pipe piece. The surface cooperates with the conical portion of the seat surface to compensate for axial and angular deviations of the member within specified tolerances.

Such tolerance compensation is also aided by the curved ring end surface of the fixing screw and the axial spacing between the cylinder head wall and the flange. The cylinder head wall and the flange may deviate from each other to some extent even at the point where the force is applied to the pipe piece.

The high-pressure conduit extending in the bent supply-side end of the tube piece is such that the fuel filter, which is in the form of a rod-shaped filter, can easily be inserted into this high-pressure conduit part from the high-pressure conduit connection. It is configured.

The pipe piece fulfilling the various functions mentioned above is preferably constructed in one piece with the fixing flange and can be constructed as a forging or as a rotationally symmetrical turning part, The free side of the supply side is freely selectable folded to connect. If the tube piece is constructed as a turning piece, the fixing flange extends around the entire circumference of the tube piece.

The fuel supply system according to the invention is particularly suitable for connection to a fuel injection valve inserted in the cylinder head of an internal combustion engine, but can also be used in similar parts, for example pumps. It is possible.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

In the embodiment of the fuel supply apparatus according to the present invention shown in FIG. 1, in the cylinder head 1 of the internal combustion engine,
A known fuel injection valve has a hole 3 that opens into a combustion chamber of an internal combustion engine.
In FIG. 1, only a part of the valve holding body 5 of the fuel injection valve is shown. The valve carrier 5 of the injection valve for supplying fuel has a radial bore 7, the outlet opening of which forms a conical seat surface 9. Oriented towards this seating surface 9, the cylinder head 1 is provided with a penetration in the form of a stepped through hole 11. The cylindrical shaft extension 15 of the tube piece 13 projects into the through hole 11. In this case, the end of the tube piece 13 on the outflow side adjacent to the seat surface 9 forms a sealing surface 17 cooperating with the seat surface 9, which sealing surface 17 curves spherically outwards. Is configured. The sealing surface 17, which is embodied as a ring surface, is in this case a high-pressure conduit 1 which penetrates the entire tube piece 13.
9 is defined radially, this high-pressure conduit 19 is preferably designed as a high-pressure hole and opens into a hole 7 in the valve carrier 5.

The tube piece 13 has an intermediate member 21 of increased diameter which is connected to a cylindrical shaft 15 which tapers conically towards the seat surface 9 and which has an increased diameter. It projects from the stepped through hole 11 of the head 1. In this case, a ring shoulder 23 is formed at the transition of the cross section to the shaft part 15. Further tube piece 13
A leaking oil chamber 25 is formed between the peripheral wall of the intermediate head 21 of the cylinder head 1 and the wall of the through hole 11 of the cylinder head 1. And a sealing ring 27 that is clamped between the two. The seal ring 27 is in this case guided in a circumferential groove 29 in the intermediate piece 21 of the tube piece.

The intermediate member 21 of the tube piece 13 is connected at its free end on the supply side to another tubular connecting member 31, the diameter of which is smaller than that of the intermediate member 21. It is bent with respect to the axes of the intermediate member 21 and the shaft 15. The free end of the connection member 31 on the supply side has a high-pressure connection 33, to which the injection conduit leading to the fuel injection pump can be connected. In this case, the cross section of the high-pressure conduit 19 in the region of the connecting member 31 is increased relative to the remaining region and forms the filter chamber 35. A rod-shaped fuel filter can be inserted into the filter chamber 35 from the end portion on the supply side. The part of the high-pressure conduit 19 that forms the filter chamber 35 is in the course of its subsequent extension.
, Intersects with the portion extending into the shaft 15.

In order to fix the tube piece 13 in the cylinder head 1, the tube piece 13 has a fixing flange 37, which is also shown in the sectional view of FIG. 2 projecting radially from the intermediate member 21
It is formed by one fixed tongue 39. These fixing tongues 39 are provided with a respective receiving hole 41 for receiving a fixing screw 43, which is screwed into a corresponding threaded hole in the wall of the cylinder head 1. This allows the tube piece 13 to be attached to its sealing surface 17
Thus, the valve holding body 5 is tightened with a sealing action in the axial direction. In order to compensate for possible angular deviations, the ring end surface 45, which is formed between the head of the fixing screw 43 and the shaft and which is in contact with the flange 37, is spherically curved outwards. Furthermore, it is guided in corresponding notches in the fixed tongue 39. In addition, the cylinder head 1 of the fixed flange 37
A defined gap is provided between the end face directed toward the and the wall of the cylinder head 1, and this gap allows angular displacement of the tube piece 13 within a predetermined range.

In order to discharge the leaked oil from the leaking oil chamber 25, the pipe piece 13 is provided with a leaking oil hole 47 which penetrates the intermediate member 21 in the axial direction thereof. It extends from the ring shoulder portion 23 as a starting point and opens to the leaking oil pipe piece 49, and this leaking oil pipe piece 49 is inserted into the bent portion of the connecting member 31 of the pipe piece 13, and this leaking oil pipe piece 49 is inserted. A leak oil discharge conduit can be connected to the.

In the structure described above, the pipe piece 13 includes the shaft 15, the intermediate member 21, and the bent connecting member 31.
And the fixing flange 37 in one piece, preferably as a forged product.

As can be seen from the above description, the fuel supply device according to the invention has, in a structurally simple manner, a fixed and a leak with a high-pressure seal and connection, a filter receiving, a manufacturing error compensating action and a leak oil sealing action. A wide variety of functions, such as oil drainage, can be integrated together in a single component, so that additional components can be omitted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a pipe piece inserted into a cylinder head of an internal combustion engine.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

1 cylinder head, 3 holes, 5 valve holder, 7
Radial hole, 9 seat surface, 11 penetration part (through hole), 13 pipe piece, 15 shaft extension part, 17
Sealing surface, 19 high pressure conduit, 21 intermediate member, 2
3 ring shoulder, 25 leak oil chamber, 27 seal ring, 29 circumferential groove, 31 connecting member, 33 high pressure connecting part, 35 filter chamber, 37 fixing flange,
39 fixing tongue, 41 receiving hole, 43 fixing screw,
45 ring end face, 47 leak oil hole, 49 leak oil pipe piece

Claims (14)

[Claims] 1. A fuel supply device, in particular a fuel supply device for a fuel injection valve inserted in a cylinder head (1) of an internal combustion engine, the pipe penetrating a penetrating part (11) of the cylinder head (1). A piece (13) is provided, which has a high-pressure connection (33) at the supply-side end of the high-pressure conduit (19) and which has a sealing surface (17) on the outflow side. ), In the type in which the valve holding body (5) of the fuel injection valve is axially clamped to the conical seat surface (9) of the supply portion, the oil leaks to the pipe piece (13). The fuel supply device is provided with a device for. 2. A device for draining oil leakage in a pipe piece (13) comprises a penetrating part (1) in a cylinder head (1).
It is formed by a leak oil hole (47) extending outward from the leak oil chamber (25) formed in 1), and the leak oil hole (47) is formed in the pipe piece (13) through the penetrating portion (11). 2. A fuel supply device according to claim 1, which extends outwardly from a ring shoulder (23) closing the valve and opens into a leaking oil pipe piece (49) inserted in the pipe piece (13). 3. A cylinder head (1) in which the pipe piece (13) is
It is bent at the end portion (31) on the supply side protruding from the leakage oil pipe piece (49).
The fuel supply device according to claim 2, wherein the axial extension of (7) is provided at the bent portion of the bent portion (31) of the pipe piece (13). 4. A leakage oil chamber (25) formed between the shaft (15) of the pipe piece (13) and the wall of the penetrating part (11) of the cylinder head (1) is provided with a leakage oil chamber (25) of the pipe piece (13). 3. The fuel supply device according to claim 2, wherein the fuel supply device is sealed between the enlarged diameter portion (21) and the wall of the penetration (11) by a sealing ring (27) inserted in this area. 5. The sealing ring (27) comprises a tube piece (13).
Fuel supply system according to claim 4, characterized in that it is guided in a radial circumferential groove (29) in the increased diameter portion (31). 6. The pipe piece (13) is provided with a fixing flange (37), of which two flanges project radially, preferably over the pipe pieces (13, 21). 2. The fuel supply device according to claim 1, wherein the tongue (39) has a respective receiving hole (41) for a fixing screw (43). 7. The cylinder head (1) of the tongue (39).
7. Fuel supply device according to claim 6, characterized in that the end face on the side has a defined distance from the wall of the cylinder head (1). 8. The fixing flange (37) is formed integrally with the pipe piece (13), and the leakage oil hole (47) is provided with a high pressure conduit (19) and a radial circumferential groove (29) between the pipe piece (13). ) And any one of claims 1 to 6 arranged between
The fuel supply device according to the paragraph. 9. A receiving hole (41) for the fixing flange (37).
The ring end surface (45) formed between the shaft and the head of the fixing screw (43) inserted into the cylinder and screwed into the wall of the cylinder head (1) is spherically curved outwards. The fuel supply device according to claim 7. 10. The fuel supply device according to claim 3, wherein a fuel filter is inserted in the high-pressure conduit (19) at the bent portion (31) of the pipe piece (13) on the supply side. 11. A cylindrical tube piece shaft (15) projecting into a penetrating portion (11) of a cylinder head (1),
The fuel supply device according to claim 1, wherein the fuel supply device has a conical taper toward the end on the outflow side. 12. Fuel according to claim 1, characterized in that the ring-shaped sealing surface (17) arranged at the outflow-side end of the pipe pieces (13, 15) is spherically curved outwards. Supply device. 13. The pipe piece (13) has a fixed flange (37).
The fuel supply device according to claim 1, wherein the fuel supply device and the fuel supply device are configured as an integrated forged product. 14. The pipe piece (13) has a fixed flange (37).
Together with the rotationally symmetrical turning part, the part (31) of the turning part on the supply side with the high-pressure connection (33) is bent following the turning process.
The fuel supply device according to claim 1 or 3.