Distributor apparatus of a common-rail system

Abstract

A distributor apparatus of a common rail system for an internal combustion engine. The distributor apparatus is designed with at least one distributor device having a high-pressure line for fuel and a plurality of feed lines branching off from the high-pressure line within the distributor device. Each feed line leads to an individual accumulator and an injector. The feed line is associated with a restriction device and a discharge bore, which is designed to cooperate with a pressure-measuring device and which is arranged downstream of the restriction device, such that the restriction device is arranged in the feed line and the discharge bore, arranged in the distributor device, is connected to the feed line downstream of the restriction device.

Claims

1. A distributor apparatus of a common rail system of an internal combustion engine, the common rail system comprising a plurality of accumulators and a plurality of injectors fluidly connected to the plurality of accumulators, the distributor apparatus comprising: at least one distributor device configured for distributing a fuel, the at least one distributor device comprising: a high pressure line for conveying the fuel; and a plurality of feed lines branching off from the high pressure line inside of the at least one distributor device, each feed line of the plurality of feed lines being configured for leading to a respective accumulator of the plurality of accumulators; a plurality of throttle devices, each throttle device of the plurality of throttle devices being arranged in a respective feed line of the plurality of feed lines; a plurality of pressure measuring devices connected to the at least one distributor device; and a plurality of discharge bores, each discharge bore of the plurality of discharge bores being arranged in the at least one distributor device, each discharge bore of the plurality of discharge bores interacting with a respective pressure measuring device of the plurality of pressure measuring devices, each discharge bore of the plurality of discharge bores being allocated to and connected with a respective feed line of the plurality of feed lines downstream in series of the plurality of throttle devices.

2. The distributor apparatus according to claim 1, wherein each feed line of the plurality of feed lines has allocated to it a respective throttle device of the plurality of throttle devices and a respective discharge bore of the plurality of discharge bores for interaction with a respective pressure measurement device of the plurality of pressure measurement devices.

3. The distributor apparatus according to claim 1, wherein the at least one distributor device defines a longitudinal axis, wherein the high pressure line extends axially along the longitudinal axis.

4. The distributor apparatus according to claim 1, wherein each discharge bore of the plurality of discharge bores is arranged axially parallel or perpendicular relative to the high pressure line in a plane parallel to the high pressure line.

5. The distributor apparatus according to claim 1, wherein the at least one distributor device is in the form of several distributor devices.

6. The distributor apparatus according to claim 5, wherein the high pressure lines of the several distributor devices are hydraulically coupled with one another.

7. The distributor apparatus according to claim 5, wherein each distributor device of the several distributor devices is in the form of one of a rail and a distributor block.

8. A common rail system of an internal combustion engine, comprising: a plurality of accumulators; a plurality of injectors fluidly connected to the plurality of accumulators; and a distributor apparatus, comprising: at least one distributor device configured for distributing a fuel, the at least one distributor device comprising: a high pressure line for conveying the fuel; and a plurality of feed lines branching off from the high pressure line inside of the at least one distributor device, each feed line of the plurality of feed lines being fluidly connected to a respective accumulator of the plurality of accumulators; a plurality of throttle devices, each throttle device of the plurality of throttle devices being arranged in a respective feed line of the plurality of feed lines; a plurality of pressure measuring devices connected to the at least one distributor device; and a plurality of discharge bores, each discharge bore of the plurality of discharge bores being arranged in the at least one distributor device, each discharge bore of the plurality of discharge bores interacting with a respective pressure measuring device of the plurality of pressure measuring devices, each discharge bore of the plurality of discharge bores being allocated to and connected with a respective feed line of the plurality of feed lines downstream in series of the plurality of throttle devices.

9. The common rail system according to claim 8, wherein each feed line of the plurality of feed lines has allocated to it a respective throttle device of the plurality of throttle devices and a respective discharge bore of the plurality of discharge bores for interaction with a respective pressure measurement device of the plurality of pressure measurement devices.

10. The common rail system according to claim 8, wherein the at least one distributor device defines a longitudinal axis, wherein the high pressure line extends axially along the longitudinal axis.

11. The common rail system according to claim 8, wherein each discharge bore of the plurality of discharge bores is arranged axially parallel or perpendicular relative to the high pressure line in a plane parallel to the high pressure line.

12. The common rail system according to claim 8, wherein the at least one distributor device is in the form of several distributor devices.

13. The common rail system according to claim 12, wherein the high pressure lines of the several distributor devices are hydraulically coupled with one another.

14. The common rail system according to claim 12, wherein each distributor device of the several distributor devices is in the form of one of a rail and a distributor block.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:

(2) FIG. 1 illustrates a schematic diagram of a common rail system with a distributor apparatus which includes several distributor devices in the embodiment of rails and distributor blocks;

(3) FIG. 2 is a perspective view of a distributor device of the distributor apparatus as shown in FIG. 1, wherein the distributor device is in the embodiment of a rail;

(4) FIG. 3 is a top view of the rail according to FIG. 2;

(5) FIG. 4 is a sectional view of the rail, taken along line IV-IV of FIG. 3;

(6) FIG. 5 is a sectional view of the rail, taken along line V-V of FIG. 4;

(7) FIG. 6 is a perspective view of an additional distributor device of the distributor apparatus shown in FIG. 1, wherein the distributor device is in the embodiment of a distributor block;

(8) FIG. 7 is a longitudinal sectional view of the distributor block according to FIG. 6; and

(9) FIG. 8 is section view of the common rail system according to FIG. 1, wherein the arrangement of the distributor apparatus is shown on a crankcase.

(10) Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate embodiments of the invention and such exemplifications are not to be construed as limiting the scope of the invention in any manner.

DETAILED DESCRIPTION OF THE INVENTION

(11) FIG. 1 illustrates a common rail system 1 of an internal combustion engine which includes a low pressure pump 3 for conveying fuel out of a fuel tank 2, an adjustable suction throttle 4 to control the fuel volume flow, a high pressure pump 5 to convey the fuel under increased pressure and a distributor apparatus 6. Distributor apparatus 6 is designed for storing fuel and for distributing the fuel to several injectors 7 which are illustrated in a simplified depiction and which are connected in each case with an individual accumulator 8 or which are designed integral with the same, and by way of which fuel can be injected into a combustion chamber of an internal combustion engine.

(12) Distributor apparatus 6 herein is designed in segments with two essentially structurally identical distributor devices 9, 10 in the embodiment of rails; and two essentially structurally identical distributor devices 11, 12 in the embodiment of distributor blocks, whereby—in delivery direction of the fuel, originating from high pressure pump 5—first a rail 9, followed by a distributor block 11 and then a further rail 10 with a subsequent distributor block 12 are provided. Additional segments with distributor devices can connect to the arrangement.

(13) FIG. 2 to FIG. 5 show a distributor device 9 in the embodiment of a rail in more detail which, according to FIG. 8 is designed as a so-called slim rail and which can be arranged on a crank housing 25. Rail 9 includes a high pressure line 14 in the embodiment of a longitudinal bore. The high pressure line 14 extends substantially in a longitudinal direction or axis or respectively in axial direction of distributor device 9, which pressure line is connected in a first axial end region 15 of rail 9 with high pressure pump 5 and in a second axial end region 16 with the subsequent distributor block 11.

(14) Inside rail 9, three feed lines 17, 18, 19 branch off from high pressure line 14—in this case in the form of parallel transverse bores which extend substantially perpendicular relative to high pressure line 14 and which in a peripheral region of rail 9 are each designed having a flange-like connecting region 20, 21, 22 through which respective feed line 17, 18, 19 is hydraulically connected with an individual accumulator 8 and an injector 7 fluidly connected to the accumulator 8. A distance D1, D2 which is located in longitudinal direction between adjacent connecting regions 20 and 21, or 21 and 22 corresponds in particular to a distance between two adjacent cylinders in the internal combustion engine.

(15) In the illustrated arrangement, each feed line 17, 18, 19 has allocated to it a throttle device 26, 27, 28 and a discharge bore 29, 30, 31 for pressure measurement, wherein throttle device 26, 27 or 28 is arranged in respective feed line 17, 18, 19 in each case upstream of respective discharge bore 29, 30 or 31. Throttle devices 26, 27, 28 herein constitute a choke valve for allocated injector 7. Discharge bores 29, 30, 31 are arranged in this case in an axial longitudinal sectional plane parallel to the plane in which high pressure line 14 extends. Discharge bores 29, 30 are connected with feed lines 17, 18 at respective ends 15, 16 of rail 9 and extend in longitudinal direction of rail 9, and discharge bore 31 of center feed line 19 extends perpendicular thereto.

(16) Three pressure measuring devices 33, 34, 35 are provided, which are respectively connected with rail 9 in the region of discharge bores 29, 30, 31 and are for example screwed onto the same. By way of pressure measuring devices 33, 34, 35 which can be designed as conventional high pressure sensors with appropriate on-site electronics and which can be connected with an electronic controller of the internal combustion engine, a pressure in feed line(s) 17, 18, 19 which corresponds with a pressure in respective individual accumulator 8 of injector 7 can be measured.

(17) FIG. 6 and FIG. 7 illustrate more clearly an additional distributor device 11 in the embodiment of a distributor block. Similar to rail 9, distributor block 11 is designed with a high pressure line 37 in axial longitudinal direction which is connected with high pressure line 14 of rail 9. In contrast to rail 9, distributor block 11 only has two feed lines 38, 39 branching off from a high pressure line 37, which are arranged comparable to feed lines 17 and 18 of rail 9. Feed lines 38, 39 each are again designed with a connecting region 49, 50 via which each feed line 38, 39 is connected with individual accumulator 8 and injector 7.

(18) Each feed line 38, 39 has again allocated to it a throttle device 42, 43 and a discharge bore 44, 45 which interacts with a pressure measuring device 46, 47. Distributor block 11 is thus designed substantially comparable to rail 9 with a shorter longitudinal extension.

(19) While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.

COMPONENT IDENTIFICATION LISTING

(20) 1 Common rail system 2 Fuel tank 3 Low pressure pump 4 Suction throttle 5 High pressure pump 6 Distributor apparatus 7 Injector 8 Individual accumulator 9 Distributor device, rail 10 Distributor device, rail 11 Distributor device, distributor block 12 Distributor device, distributor block 14 High pressure line 15 First axial end region 16 Second axial end region 17 First feed line 18 Second feed line 19 Third feed line 20 Connecting region 21 Connecting region 22 Connecting region 25 Crank housing 26 Throttle device 27 Throttle device 28 Throttle device 29 Discharge bore 30 Discharge bore 31 Discharge bore 33 Pressure measuring device 34 Pressure measuring device 35 Pressure measuring device 37 High pressure line 38 Feed line 39 Feed line 42 Throttle device 43 Throttle device 44 Discharge bore 45 Discharge bore 46 Pressure measuring device 47 Pressure measuring device 49 Connecting region 50 Connecting region D1 Distance D2 Distance