JPH0447141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention relates to a connection of an injection pump in which a plurality of injection conduits of the same cross-sectional area and the same length with adjustment arcs are arranged in a pivotable manner in an internal combustion engine for pump adjustment. The present invention relates to an injection conduit holding device for a multi-cylinder internal combustion engine, which leads from each point to the corresponding injection nozzle and is held as close together as possible by a holding body provided with vibration-damping holding body inserts.

BACKGROUND OF THE INVENTION In multi-cylinder internal combustion engines, the injection conduits from the injection pump to the injection nozzle belonging to each cylinder all have the same length. In other words, when the fuel is delivered from the injection pump, a pressure wave corresponding to the speed of sound is generated, and this pressure wave opens the nozzle needle of the injection valve, thus injecting the fuel. This is because only when using a single injection conduit, the propagation time of the pressure wave up to the injection of fuel is the same in the individual injection conduits. In this way, exactly the same injection start time is obtained for each cylinder. On the other hand, in order to adapt injection conduits of the same length to different distances between the injection pump and the respective cylinder and thus the injection nozzle, the injection conduits each have an arcuate bend (adjustment arc).

A plurality of injection ducts with adjusting arcs are laid between the injection pump and the injection nozzle in the engine room, and specific sections of these injection ducts guided in parallel are held by elastic holders in accordance with the requirements of vibration technology. This is known from German Patent No. 2527257. By connecting the injection ducts, which are bundled as far as possible, by means of elastic holders, vibration stresses can be absorbed, so that the risk of fatigue failure due to vibrations of the injection ducts is reduced. However, after a certain travel time, for example due to elongation of the transmission chain, the injection start time is set again, and for this purpose the injection pump has to be swiveled around its camshaft (this injection pump is also designed to be swivelable). (assuming that the injection pipe is bent). This new position may result in a condition that is initially unprotected against carefully adjusted vibration characteristics. Vibration fatigue failures at the connection points of the injection pump or injection nozzle can therefore no longer be avoided.

OBJECTS OF THE INVENTION It is an object of the invention to ensure that the precise line guidance between the injection pump and the injection line which is assembled in the area of the injection line holding device does not change even when the pump is adjusted, for example when a new setting of the injection start time is performed. It is an object of the present invention to provide an improved injection conduit holding device for injection conduits that are bundled in a particular section so as to prevent the injection conduits from being bundled in a particular section.

SUMMARY OF THE INVENTION In order to achieve this object, according to the invention, an injection line holding device has a mounting strip which extends over several intake pipes of an internal combustion engine and serves as a carrier for the holding body. , the mounting strip has at least one elongated hole extending in the direction of pivoting of the injection pump about the pivot axis, via which the mounting strip can be pivoted about the pivot axis of the injection pump; Screwed to the internal combustion engine.

Effects of the Invention Thus, according to the invention, a plurality of injection conduits are held together on a mounting strip extending over a plurality of intake pipes via a holder provided with a holder insert piece for damping vibrations. , vibration of the injection conduits is prevented, and fatigue failure due to vibration of these conduits can be avoided. Furthermore, for the screw connection to the internal combustion engine, the mounting strip has an elongated hole extending in the direction of rotation of the injection pump, which allows the injection pump to be swiveled around its axis for adjustment of the injection pump, compensation of component tolerances, etc. In this case, the mounting strip can also be pivoted around the same pivot axis, so that the line guidance between the mounting strip and the injection pump remains unchanged and mutual bending of the injection lines can be avoided. .

EXAMPLES The present invention will be explained in detail by means of examples shown in the drawings.

In a four-cylinder internal combustion engine 1 with a pivotably mounted injection pump 2, injection conduits 3, 4,
5 and 6 are connection points 2a and 2 of this injection pump 2
b, 2c, 2d to the injection nozzles 7, 8, 9, 10 attached to the cylinders of the engine 1 (Figs. 1 and 2).
Figure). The injection conduits 3, 4, 5, 6 have the same conduit length and the same cross-sectional area. In order to avoid fatigue failure due to vibration, three intake pipes 12, 1
A special injection conduit holding device 11, 38 is provided which consists of a mounting strip 16 extending over 3, 14 parallel to the longitudinal center plane of the cylinder head 15 and elastic holding bodies 17, 18, 19. Holder 1
7, 18, 19 serve for conduit guidance and position fixing of the injection conduits 3, 4, 5 which extend linearly next to each other on the mounting strip 16. Each injection conduit 3, 4, 5 has an injection conduit holding device 11,
38 and the injection nozzles 7, 8, 9, 10, each has an adjusting arc.

The mounting strip 16 has tongue pieces (hereinafter referred to as seam plates) 20 and 21 at both ends thereof, and these seam plates 2
Mounting screws 24, 25 passed through elongated holes 22, 23 at 0, 21 connect joint plates 20, 25 to support blocks 26, 27 integrally cast on intake pipes 12, 14.
21 is fixedly connected. The joint plates 20, 21 of the mounting strip 16 are pivoted around the pivot axis 28 of the injection pump 2, and when adjusting the discharge start time and pivoting the injection pump 2, the mounting strips 16 are rotated after loosening the mounting screws 24, 25. 16 by the same angle, a relative movement of the conduit sections of the injection conduits 3, 4, 5 between the connection points 2a to 2c of the injection pump 2 and the mounting strip 16 is prevented. This also applies to the injection conduit holding device shown at 38. The injection conduit holding device 38 includes a mounting arm 40 having an elongated hole and configured to be pivotable, on which a flexible holding body insert piece 2 is mounted.
A holder 41 with 9 is attached. A separately installed injection line 6 is held and guided in this holder 41 and, viewed from the connection point of the injection pump 2, initially runs in the opposite direction to the injection lines 3, 4, 5. The attachment arm 40 is attached to a connecting piece 42 that connects the intake pipe 13 to the intake pipe 14 by a coupling screw.

Three elastic retainers 1 on mounting strips 16
7, 18, 19, according to FIG.
7 is in the area of the seam plate 20, the holding body 19 is in the area of the seam plate 21, and the holding body 18 is in the area of the mounting strip 1.
It is provided approximately at the center of the length of 6. Holder 1
Injection lines 3, 4, 5 are guided in 7 and 18, and only injection line 5 is guided in holder 19.

Each holder 17, 18, 19 and 41 consists of a flexible holder insert 29, which serves as a resting piece for at least one injection conduit, and a clip element 30, which tightly surrounds the injection conduit. Figures 3 and 4). The holding body insertion piece 29 is made of a rubber plate, and is attached to the mounting strip 16 and the mounting arm 40.
It is tightened and held in a notch 31 located at. The clip element 30 made of thermoplastic is
It has integrally molded contours 30a, 30b for precisely fixing the position of the injection conduit and is fixed in position by means of restraining locks 34, 35 which fit into the openings 32, 33 of the mounting strip 16 and the mounting arm 40. The holding force is generated by elastic deformation of the rubber plate 29.

The holding body partially shown in FIG.
It differs from the holder shown in FIG. 3 in that it is provided at a 90° offset. Depending on the required location and accessibility, a restraining lock according to FIG. 3 or FIG. 4 can be used.

The rubber plate 29 and the clip element 30 act to damp vibrations due to the properties of their materials.

The individually installed injection conduit 6 is also attached by a stationary holder 43, which allows movement of the injection conduit in the transverse direction of the engine in order to compensate for component tolerances during assembly, and which also allows the injection pump allows for slight adjustments when the rotation position of the

[Brief explanation of the drawing]

FIG. 1 shows a front view of an injection conduit holding device and an injection pump mounted pivotably on an internal combustion engine; FIG. 2 shows an injection conduit holding device consisting of a mounting strip and a holding body and an injection conduit leading from the injection pump to an injection nozzle. 3 is a sectional view of the holder clipped to the mounting strip, and FIG. 4 is a sectional view of another embodiment of the holder. 1...Internal combustion engine, 2...Injection pump, 2a-2
d... Connection point, 3-6... Injection pipe, 7-10
... Injection nozzle, 11 ... Injection conduit holding device, 1
2, 13, 14... Intake pipe, 16... Mounting strip, 17, 18, 19... Holder, 22, 23...
...Elongated hole, 24, 25...Mounting screw, 28...Swivel axis, 29...Holder insertion piece.

Claims (1)

[Scope of Claims] 1. A plurality of injection conduits of the same cross-sectional area and the same length with adjustment arcs each lead from a connection point of an injection pump which is pivotably mounted on an internal combustion engine for pump adjustment to a corresponding injection nozzle. , the injection line holding device is held together as much as possible by a holding body with vibration-damping holding body inserts, in which the injection line holding device is connected to a plurality of intake pipes 12, 13, 14 of the internal combustion engine 1. At least one elongated hole which extends in the direction of rotation of the injection pump 2 about the pivot axis 28 has a mounting strip 16 which extends across and serves as a carrier for the holding bodies 17, 18, 19. 22, 23, and the mounting strip 16 is inserted through the elongated holes 22, 23.
An injection conduit holding device for a multi-cylinder internal combustion engine, characterized in that it is screwed to the internal combustion engine 1 so as to be pivotable about a pivot axis 28 of the injection pump 2. 2. A mounting strip 16 is provided parallel to the longitudinal center plane of the cylinder head 15 of the internal combustion engine 1 and connects the injection conduits 3, 4, between this mounting strip 16 and the injection nozzles 7, 8, 9. The conduit portions of the injection conduits 3, 4, 5, each of which has an adjusting arc and which extend parallel to each other along the mounting strip 16, are connected to the holder 1.
Injection conduit holding device according to claim 1, characterized in that it is guided by 7, 18, 19. 3 each mounting strip 16 has an elongated hole 22 at its end;
23, which tongues 20, 21 are mounted on support blocks 26, 27 which are integrally cast on the intake pipes 12, 14. The injection conduit holding device according to item 1 or 2. 4 Attachment strip 16 connects at least three intake pipes 1
2, 13, 14 and a holding body 17,
18, 19, of which the holding body 17 closest to the injection pump 2 and the mounting strip 1
A holding body 18 provided in the middle of the length of the injection pump 2 is provided for receiving three injection conduits 3, 4, 5 in each case, and a holding body 19 located at the farthest end of the injection pump 2 receives one injection conduit 5. Injection conduit holding device according to one of the claims 1 to 3, characterized in that it is provided for receiving a. 5. The injection conduit holding device has a mounting arm 40 having an elongated hole 39 and located in the farthest range from the injection nozzles 7 to 10, and a holding body 41 which is tightly coupled to this mounting arm 40 and has a holding body insertion piece 29. An injection conduit holding device according to claim 1, characterized in that it comprises: 6. The retainer insert 29 used for the retainer 17, 18, 19; Injection conduit holding device according to claim 1 or 5, characterized in that the position is fixed in a certain notch (31). 7 The injection conduit resting on the rubber plate 29 is restrainedly connected to the mounting strip 16 or the mounting arm 40 and has integrally molded contours 30a, 30 adapted to the injection conduit.
7. Injection conduit holding device according to claim 6, characterized in that it is held and guided by a clip element 30 having a diameter b. 8 The restraining hooks 34, 35 attached to the sides of the clip element 30 engage the openings 32, 3 of the mounting strip 16.
8. Injection conduit holding device according to claim 7, characterized in that the injection conduit retaining device is fitted to a third part.