JPH0826829B2 - Internal combustion engine with injection system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an injection system and a separately supported injection pump, which is connected via a plastic tube to an injection valve provided in a cylinder head, It relates to an internal combustion engine in which a pipe is held together with an injection valve and an injection pump via a connecting member.

[0002]

In the cylinder head known from U.S. Pat. No. 3,845,748, fuel is supplied to the injection valve via a conduit guided by the cylinder head. This conduit is arranged in the tube form and is fixed by the injection valve via a pressure screw. In this case, the conical tip of the tube end is received by an opening corresponding to the valve body. The other end of the conduit is connected to an injection pump which is arranged substantially parallel to the injection valve. Furthermore, it is known from DE-A-3128523 to provide a connecting pipe between the injection valve and the injection pump. This connecting pipe consists of a pipe and a conduit connected to it. The tube and the conduit are fixed to each other. Due to the position of the injection pump with respect to the injection valve, the exposed conduit exiting the injection pump is bent at a right angle. Such conduits have the disadvantage that vibration often damages the injection pump or injection valve due to its poor elasticity, or the relatively movable arrangement of the conduit causes the conduit-pipe connection area to be reduced. The disadvantage is that the liquid-tight connection is not completely guaranteed in.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to construct a fuel pipe between an injection valve and an injection pump in the following manner, that is, to eliminate misalignment of various connection points during mounting,
The fuel pipe is configured so that elastic movement between the injection pump and the cylinder head is allowed to be restricted so that the non-liquid tightness between the conduits and the non-liquid tightness with respect to the injection nozzle and the injection pump does not occur. That is.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a plastic pipe has two conduits which are arranged at right angles to each other and which are linear pressure members, and are connected to an injection pump. A lateral pressure member is present in the area of the corners where the two conduits meet, via a flat packing surface,
Corresponding packing surfaces connect to radial pressure members arranged in the cylinder head, which transverse pressure members are held via clamping screws in a receiving case integrally cast into the cylinder head, and The pump case and the receiving case are guided so as to project toward the adjacent injection pump through the slide sleeve, and the pump case and the receiving case are configured as a Bourdon tube, and both pressure members are elastic. It is characterized by the fact that it is retained.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The internal combustion engine has a cylinder head 1 incorporating an injection system. The injection system has an injection valve 2 and an injection pump 3. The injection pump 3 is
It is arranged so as to be adjacent to a receiving case 4 which is integrally cast on the cylinder head 1. The receiving case 4 has a receiving duct 5 for receiving a conduit 7 leading to the injection pump 3 and consisting of a lateral pressure member 6, the pump case 3a, 3b
It is tightened and held therein by using a tightening screw 8.
Connected to the lateral pressure member 6 is a further conduit 10 leading to the injection valve 2 and consisting of a radial pressure member 9 in the confronting corner region 11 of both conduits 9 and 10,
No. 0 is fixed in a liquid-tight manner via a tightening screw 8.

The pressure members 6 and 9 are arranged at right angles to each other. In this case, the radial pressure member 9 is guided in the bore 12 of the cylinder head 1 to the injection valve 2. The radial pressure member 9 communicates with the integrally cast receiving case 4 by an end 13 on the side opposite to the injection valve 2. A lateral pressure member 6 extends from the receiving case 4 to the pump cases 3a, 3b. In this case, the free end 13a of the transverse pressure member is clamped against the pump element 16 by means of a pressure screw 15. The receiving case 4 is connected to the pump case 3 via the slide sleeve 17.
It is connected to a and 3b. The lateral pressure member 6 also extends through the slide sleeve 17 in the encapsulated state.

The radial pressure member 9 has, on its outer circumference, outer circumference rings 18 which are arranged at a distance from each other. The outer ring 18 has a radial pressure member 9 within the bore 12.
Is accurately positioned. Both pressure members 6, 9 are fixed in position so that they are at right angles to each other via a clamping screw 8 arranged coaxially with the radial pressure member 9 so as to cooperate with the pressure screw 15 in the pump case 3a, 3b. Has been done.

The connection of the conduits is made by the flat packing surfaces 19, 2
Through 0. The packing surfaces 19 and 20 are oriented so that they are parallel to each other, for example as shown in detail in FIG. Similarly, packing surfaces 21, 22 are formed between the injection valve 2 and the radial pressure member 9,
3, 24 are formed between the lateral pressure member 6 and the injection pump 3.

The receiving case 4 and the pump case 3b form a so-called Bourdon tube. Due to its predetermined construction, the Bourdon tube is a tubular element in cross-section and, to some extent, is elastically flexible. In particular, when the radial pressure member 9 or the lateral pressure member 6 is lengthened, it flexes elastically.

Conduits 7 and 1 formed from pressure members 6 and 9
0 is the case 3 from the injection pump 3 to the injection valve 2.
It is encapsulated through a, 3b, 4 and the slide sleeve 17, or through the hole 12 of the cylinder head 1. Therefore, the medium is prevented from flowing out.

The clamping screw 8 and the pressing screw 15 clamp the pressure members 6 and 9 via the flat end faces 25 and 26.
According to another construction, not shown in detail, it is also possible to provide spherical elements on the end faces of the screws 8 and 15. These ball elements are provided for the pressure members 6 and 9.

As shown in detail in FIGS. 2 and 3, the connection of the lateral pressure member 6 to the injection pump 3 can be made in various configurations. It is advantageous to use flat high pressure packing. However, a hardened cone connection (cone 16a) is also advantageous. Also in this case, it is advantageous to configure the pump case 3a as a Bourdon tube. However, it is possible to give elasticity to the pressing screw 15.

Next, the advantageous configurations of the present invention will be listed.

(1) Receiving case (4) integrally cast on the cylinder head (1) and other receiving cases (3a, 3b)
And are formed in a tubular shape in the transverse section, and the cases (4, 3a, 3
Internal combustion engine, characterized in that the wall of b) has a restrictively formed elastic wall.

(2) A slide sleeve (17) is arranged in close connection with the receiving case (4, 3a, 3b) and is arranged for a transverse pressure member (6) or a radial pressure member (9). The internal combustion engine according to item 1 above, wherein

(3) A conduit (7, 10) consisting of a radial pressure member (9) and a lateral pressure member (6) extending from the injection pump (3) to the injection valve (2) is a cylinder head (1). ) In a state of being encapsulated in the above), it is arranged so as to pass through another receiving case (3a, 3b) on the pump side through the receiving case (4) and the slide sleeve (17). The internal combustion engine as described in the above item 1 or 2.

(4) The tightening screw (8) is arranged coaxially with the radial pressure member (9) in the corner areas (11) of both pressure members (6, 9), and the tightening screw (8) and the radial pressure Internal combustion engine according to any one of claims 1 to 3, characterized in that the free end (13b) of the lateral pressure member (6) is clamped between the members (9). .

(5) Case of injection pump (3) (3a,
The pressing screw (15) provided in 3b) causes the free end (13)
a) is arranged radially opposite the connecting member on the end side of the lateral pressure member (6) provided in a), the free end (13a) of which is located opposite the pressure screw (15) and the injection pump (3).
The internal combustion engine according to any one of the above items 1 to 4, wherein the internal combustion engine is clamped and held between the conical portions (16a).

(6) Press screw (15) or tightening screw (8) and free end (13a, 13a,
13b), an internal combustion element according to any one of the above items 1 to 5, characterized in that a conical element made of a wear-resistant material is arranged between each of the connecting members. organ.

(7) Flat packing surface (19, 20, 2)
1, 22, 23, 24) so as to vertically overlap with the connecting region of the pressure members (6, 9), and the injection pump (3) and the injection valve (2) have an elastoplastic ring surface. The internal combustion engine according to any one of items 1 to 6 above.

(8) The radial pressure member (9) is centered in the bore (12) of the cylinder head (1) via raised peripheral rings (18) spaced apart from each other. The internal combustion engine according to any one of items 1 to 7 above.

(9) The internal combustion engine according to the above item 8, wherein at least the outer peripheral ring (18) on the injection valve (2) side is elastically configured.

(10) The tightening screw (8) and the pressing screw (15) are elastically configured in the axial direction, according to any one of the above items 1 to 9. Internal combustion engine.

(11) A disc spring for elastically bending in the axial direction is arranged between the screw (8, 15) and the pressure member (6, 9). The internal combustion engine according to any one of items 1 to 10.

[0026]

The main advantage obtained by the present invention is that the plastic tube includes a tube section which forms a clampable pressure member and connects the injection pump with the injection valve. The connection between the pipe and the parts and the connection between the pipes are performed with a structurally simple structure via a tightening bolt provided at the center of the receiving case of the cylinder head. In particular, the conduit and the part are connected to the packing surface, which is parallel to the plane, via a flat or conical pressing element, so that a certain elasticity of the two tubes or mutual movability is obtained. . Therefore, the deformation of the engine and the relative movement between the injection pump and the injection valve can be compensated, without any packing problems.

By arranging and arranging two conduits according to the invention, the cylinder head acts as a power inlet for connecting these conduits to each other and to the injection pump and the injection valve.

In the case of high-pressure connections, it has proven advantageous to provide a flat packing surface. The flat packing surface is
It has a ring surface configured in consideration of pressure. The ring surface deforms slightly like elastoplasts, but hardly displaces under the necessary prestressing force. In order to obtain these flat packing surfaces, it must be possible for these packing surfaces to engage as parallel to each other as possible in the mounted state. For this reason, the radial pressure member is precisely guided in the cylinder head and lies at right angles to the axis of the injection valve. Similarly, the length of the radial pressure member to the injection pump is determined so that the lateral pressure member extends exactly at right angles to the radial pressure member. Differences in tolerances can be easily compensated for by sliding on flat packing surfaces in the height and lateral directions. In the injection valve, these packing surfaces can be adapted even in the lateral direction by slightly rotating the injection valve. Compensation for the lateral tolerances associated with the collision of the radial and lateral pressure members is obtained as follows: i. The surface is very elastic and the diameter of the radial pressure member outside the guides provided in the cylinder head is very elastic towards the transverse pressure member in its tubular part. It is obtained by doing.

For the low and high cycles that occur during engine operation, both the radial and lateral pressure members are provided with sufficient resilience to fit them together. The tubular receiving case integrally cast on the cylinder head has the following configuration with respect to its shape: when the radial pressure member expands toward the cooler cylinder head due to the heat of heavy oil, the receiving case is It is configured so that it can be elastically bent as a Bourdon tube. Similarly, the receiving case on the injection pump side, which holds the lateral pressure member tightly, is also constructed as a Bourdon tube. The structure according to the present invention is also characterized by a pressing screw and a tightening screw that are given elasticity by a disc spring, for example.

[Brief description of drawings]

FIG. 1 shows a connecting pipe connecting an injection pump and an injection valve, which is configured as a radial pressure member and a lateral pressure member.

FIG. 2 is an enlarged view showing a structure for fastening and connecting a lateral pressure member with a pressing screw to an injection pump having a flat packing surface and a pressing surface.

FIG. 3 is an enlarged view of a connecting portion between an injection pump and a conical portion provided on a lateral pressure member.

FIG. 4 shows a radial pressure member with a connection for a lateral pressure member.

FIG. 5 shows a receiving case on the injection pump side configured as a Bourdon tube.

FIG. 6 is a plan view of FIG.

[Explanation of symbols]

 1 Cylinder Head 2 Injection Valve 3 Injection Pump 4 Receiving Case 6 Lateral Pressure Member 7,10 Conduit 9 Radial Pressure Member 11 Corner Area 17 Sliding Case 19,20 Packing Surface

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Reinhard Hefner Germany Day 2307 Denissch Nienhof Lerchenweg 3 (72) Inventor Hans Heinzone Germany Day 2307 Danish Schenhagen Paul Schroeder Strasse 32 ( 56) References JP-A-2-33465 (JP, A) Actually open 2-24064 (JP, U) Actually open 61-164468 (JP, U) Actually open 59-76761 (JP, U)

Claims (1)

[Claims] 1. An injection system and an injection pump supported separately, the injection pump being connected via a plastic pipe to an injection valve provided in a cylinder head, the plastic pipe being connected to the injection valve and In an internal combustion engine held together with an injection pump via a connecting member, a plastic tube has two conduits (7, 10) consisting of straight pressure members (6, 9) arranged at right angles to each other, A lateral pressure member (6), which is connected to the injection pump (3), is provided in the corner area (11) where the two conduits (7, 10) meet, via a flat packing surface (19). , By means of corresponding packing surfaces (20), connected to a radial pressure member (9) arranged in the cylinder head (1), said lateral pressure member (6) being tightening screw (8).
Is held in a receiving case (4) integrally cast into the cylinder head (1) via the pump case (3).
a, 3b) and the receiving case (4) are guided via the slide sleeve (17) so as to project toward the adjacent injection pump (3), the pump case (3a, 3b) An internal combustion engine characterized in that the receiving case (4) and the receiving case (4) are configured as a Bourdon tube, and both pressure members (6, 9) are elastically held.