JPH0415981Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a fuel injection device for an internal combustion engine, which
of the type comprising a fuel supply device for supplying fuel to the injection valve via a supply conduit and means for controlling the fuel injection process temporally and quantitatively in relation to the changing operating characteristic values of the internal combustion engine Regarding.

Prior Art According to West German Patent No. 613373, in a fuel injection pump for an internal combustion engine, both a control edge that defines the injection start time and a control edge that defines the injection end time are equal to the injection start time. Types that are rotatable relative to each other or together in order to change the injection end timing and injection amount are known. However, due to its construction, this known fuel injection pump cannot be used for conveying heavy oil at high pressures of more than 1000 bar. This is because in this case, the pump piston has a vertical hole, and the maximum injection pressure acts within the vertical hole from the center to the outer periphery.
This is because expansion of the pump piston is unavoidable after a certain amount of operating time has elapsed. As a result, strong wear is caused between the pump piston and the pump cylinder, or in the worst case, the pump piston gets stuck in the cylinder hole of the pump cylinder and becomes immovable. Furthermore, this known fuel injection pump has the disadvantage that it is difficult to rotate the control sleeve, which holds the lower control lip that defines the end of injection, during operation of the pump. This is because, in this fuel injection pump, high pressure acts on the control sleeve through a horizontal hole that branches off from a vertical hole in the pump piston.
This high pressure acts on the control sleeve in one direction, tilting the control sleeve and crimping the control sleeve in one direction against the pump casing surrounding the control sleeve. Moreover, due to the high pressure that is constantly acting on the control sleeve, expansion of the control sleeve is unavoidable, which leads to excessive leakage and pressure losses. This leakage at least prevents the formation of the necessary high injection pressure in the fuel injection pump, so that the necessary injection pressure is not achieved at the desired time, but only at a later time. Furthermore, the many relatively rotatable control and regulating sleeves in this known fuel injection pump are relatively difficult to manufacture.
This is because precise coaxiality and very tight fitting tolerances between the control and regulating sleeves are necessary to enable the fuel injection pump to function reliably over long periods of time. Furthermore, when the known fuel injection pump is used for conveying fuel at high pressures above 1000 bar, the control edge is adjusted by means of a sleeve and a control rod that engages this sleeve.
Requires an adjustment device that can apply extremely large adjustment forces.

Problems to be Solved by the Present Invention The problems to be solved by the present invention are to be able to properly regulate fuel consumption over the entire load range of an internal combustion engine, and to be less expensive than comparable high-pressure injection systems. and to provide a fuel injection device that works reliably over a long service life.

Means for Solving the Problems The means for solving the problems according to the present invention are that, in the fuel injection device of the type mentioned at the beginning, (a) the fuel supply device is controlled synchronously with the internal combustion engine; Fuel that supplies fuel to the supply conduit leading to the injection valve for each injection process at a pressure higher than the opening pressure of the injection valve for a time longer than the longest injection time that can be given to that injection process. (b) A control conduit is connected to the supply conduit, and a control mechanism having a rotatable control piston is connected to the control conduit, and the control piston is configured to control the fuel supply conduit. The device is configured to be actuated axially in synchronization with the preparatory device to interrupt or open the connection between the control conduit and the pressure relief point in relation to the axial position of the control piston, the control piston being configured to A control edge is provided which is arranged obliquely to the axis, and this control edge controls the timing of closing and opening of the connection between the control conduit and the pressure relief point in accordance with the rotational position of the control piston, thereby controlling the injection process. The timing of the injection start and/or end of the injection is advanced or delayed, and/or the injection amount is changed.

Effects of the Invention The fuel injection device of the present invention is characterized by a fuel preparation device that is simple in structure and has a long service life. This fuel preparation device does not need to determine when to start fuel injection, when to end fuel injection, or how much to inject, and only needs to supply fuel to the injection valve at a sufficiently high pressure, so it is structurally simple and robust. , can be manufactured at relatively low cost. In the fuel injection device of the present invention, the control mechanism that controls the fuel injection start timing, injection end timing, and injection amount can be realized with a smaller mechanism than the fuel preparation device that generates the injection pressure. As a result, the cost of the fuel injector of the present invention is significantly lower than that of comparable fuel injectors.

Embodiments of the invention will now be described with reference to the drawings: FIGS. 1 to 4 show an injection device to which a cylinder of an internal combustion engine is assigned. In this injection device, an injection valve 1 is connected via a supply line 2 to a fuel supply device and is thereby supplied with fuel.

According to the present invention, the fuel supply device has a fuel preparation device, which is controlled synchronously with the engine for the injection process, but does not contain the fuel for a period longer than the maximum duration of the injection process. into the supply conduit 2 leading to the injection valve 1 at a pressure significantly higher than the opening pressure of the injection valve.

In the embodiment shown in FIGS. 1 and 2, a block pump 3 is used as the fuel preparation device. This block pump 3 has a reciprocating pump plunger 4 without a control lip. This pump plunger 4 can be actuated by a conveying cam 5, which is driven from a crankshaft (not shown) of the engine and is arranged on a camshaft (also not shown). The pump plunger 4 operates in a pump cylinder 6 inserted into the pump casing 7. A valve holder 8 and a connecting piece 11 for a pressure valve 10 connected to the outlet channel 9 are connected above the pump cylinder 6 . An outflow passage 9 branches from the pump pressure chamber and is connected to a supply conduit 2 leading to the injection valve 1.
It is connected to the. This supply conduit 2 has a connecting piece 11
connected in a manner not shown. The pump pressure chamber 12 faces rearward in the pump cylinder 6 and is bounded by the front end face 13 of the pump plunger 4 . With this end face 13 of the pump plunger 4, the opening and closing of the suction hole 14 is controlled by the working movement of the pump plunger 4. Via this suction hole 14, fuel reaches the pump pressure chamber 12 from a suction chamber 15 surrounding the pump cylinder 6. A suction chamber 15 formed inside the pump housing 7 is connected to a fuel tank (not shown) via a suction conduit 16, to which, if necessary, a conveying pump is connected. The pump plunger 4 is fixed by a pressure pin 17 to a holder 18 of a pressure spring 19. The pressure spring 19 is arranged between a radially projecting flange 20 of the bowl-shaped holder 18 and a support surface 21 configured on the pump housing at an axial distance therefrom. A holding body 18 and a pump plunger 4 are attached to the pressing pin 17.
In addition to its function as a connecting member between the tappet 2
It has the function of performing a combination with 2. This tappet 22 is guided in a hole 23 provided in the pump housing and is driven by the conveying cam 5 via a roller 24 which is loaded by a pressure spring 19 and is supported on the tappet 22.

Block pump 3 conveys fuel via supply line 2 to injection valve 1 . The opening pressure of this injection valve 1 is lower than the maximum fuel pressure produced by the block pump 3 and is, for example, approximately 700 bar in the case of a high-pressure injection system.

In the embodiment shown in FIGS. 3 and 4, a high pressure accumulator 25 is provided as part of the fuel preparation system. This high pressure accumulator 25 has a transfer pump 26
supplies fuel from tank 27. High pressure accumulator 2
5 is transferred to tank 2 by overpressure conduit 29.
A pressure level higher than the opening pressure of the injection valve 1 is maintained by a pressure maintenance valve 28 connected to the injection valve 7 . A control valve 30 is assigned to the aforementioned parts 25 to 29 as a further part of the fuel preparation device. This control valve 30 is connected to the supply conduit 2 and can be shut off or opened by means of an electromagnetically or electro-hydraulically controllable shutoff mechanism.
This control valve 30 has a control device 31 assigned thereto.
synchronously with the engine, fuel is supplied from the high-pressure accumulator 25 to the injection valve 1 via the supply conduit 2 for each injection process, but for a time period that is longer than the maximum duration of the injection process. controlled so that

A check valve 32 may be connected to the supply line 2 for the injection valve in all the embodiments shown in FIGS. 1 to 4. This check valve 32
This serves in particular to counteract the negative effects of pressure waves occurring in the line system, especially cavitation disturbances. The supply conduit 2 is provided with a check valve 32 and, seen in the flow direction, behind the check valve 32 - a control conduit 33 as a further component of the invention.
is connected. A control mechanism, generally designated 34, is connected to this control conduit 33.
Control conduit 33 is connected to the fuel tank.

The control mechanism 34 has a rotatable control piston 35. This control piston 35 can be actuated synchronously during the fuel preparation period and, depending on its axial position, shuts off or opens the control conduit 33 and has a control lip inclined with respect to the piston axis. By means of this control edge, the control piston can control the start and/or end of the injection process and/or the injection quantity depending on the rotational position.

The control conduit 33 primarily connects at least the control mechanism 3
4 has a significantly smaller cross-sectional area than the supply line 2 for the injection valve 1. In other words, significantly smaller means 1/4 to 1/10
That's it.

The control mechanism 34 is advantageously constituted by an injection pump whose function has been converted and whose construction has been slightly modified. In this case, the functional conversion is carried out in such a way that, when used in this way, the injection pump can influence the pressure profile of the fuel delivered to the injection valve by the other components in a targeted manner. ing.

The injection pump forming the control mechanism 34 is smaller than, for example, the block pump or the conveying pump 26 which supplies the high-pressure accumulator 25 when used according to the invention. The drawings are drawn out of scale in this regard. In the case of the injection pump forming the control mechanism 34, in order to use it as in the present invention, the function of the pressure chamber is converted to the pressure relief chamber 36, and the function of the suction hole is converted to the relief hole 37. The chamber has been functionally converted into a pressure relief chamber 38. A portion of the control conduit 33 that communicates with the fuel tank 27 branches off from this pressure relief chamber 38 .

A control cam 39 is assigned to the control piston 35 of the control mechanism 34 for actuating it. This control cam 39 is driven from the crankshaft or camshaft of the internal combustion engine. However, control piston 3
5 can also be operated by other means, for example hydraulically or pneumatically. The detailed structure of the control mechanism 34 is shown in FIGS. 5 and 6. In this case, FIG. 5 is an enlarged view of the control mechanism 34 shown in FIGS. 1 and 3, whereas FIG. 6 is an enlarged view of the control mechanism 34 shown in FIGS. This is an enlarged view. in this case,
Regarding the details of the control mechanism, the symbols used in Figs.
It is omitted from the drawings to FIG.

The control mechanism 34, which is shown enlarged in FIGS. 5 and 6 and is constructed in the form of an injection pump, has in both embodiments a casing 40 into which a pump cylinder 41 is inserted. has been done. This pump cylinder 41 is the pump cylinder 4
It is held in the installed position by a connecting piece 42 connected to the upper part of 1 and fixed to the casing 40. A part of the control line 33 in front of the control mechanism 34 is connected to this connection piece 42 . This control conduit 33 is passed through the interior of the connecting piece 42, where it branches into two conduit lines. In this case, the first conduit is connected to the hole 43 in the connecting piece 42 and the pressure relief chamber 36.
and a relief hole 37 communicating with the pressure relief chamber 38. This conduit of the control conduit 33 is connected to the control piston 3 reciprocating within the pump cylinder 41.
It can be shut off or opened by means of the upper inclined control edge 44 of 5. In this case, the opening and closing of the relief hole 37 connecting the pressure relief chamber 36 and the pressure relief chamber 38 is controlled. A lower control lip 45 arranged obliquely to the piston axis of the control piston 35 and axially offset with respect to the upper control lip 44 connects the control conduit 3
3, serves to shut off or open the second conduit inside the control mechanism. This second conduit is designated generally at 46 in the drawings.
The conduit branches from a hole 43 extending inside the connecting piece 42 and through horizontal and vertical holes 461, 462, 463, 464 extending inside the connecting piece 42 and the pump cylinder 41.
In addition to the ring groove 465 and the ring groove 465, the control piston 35 includes a radially extending groove 47 and a longitudinal groove 466. The upper side wall of the groove 47 or the inclined part of this groove 47 forms the lower control edge 45 . The lateral hole 464 branches from a ring groove 465 surrounding the pump cylinder and opens into the pressure relief chamber 38 . The ring groove 47 is connected to the longitudinal groove 466, so that the groove 47 with the lower control edge 45 is always filled with fuel. The horizontal hole 463 opens into the pump cylinder hole above the ring groove 465 at a predetermined interval in the axial direction. Control piston lateral hole 46
3 and the groove 47 is established in that the opening cross-section of the transverse hole 463 is opened by the lower control edge 45 during the upward movement of the control piston. The pressure relief chamber 38 forms part of the control line 33 in which the two lines are reunited and from which the pressure relieved fuel flows back to the fuel tank.

In one advantageous embodiment of the invention, the control piston is constructed such that both control edges 44 and 45 are pivotable relative to each other. Furthermore, both control edges 44 and 4
Each of the 5 is assigned its own pivoting mechanism with control and adjustment mechanisms. Depending on these pivoting mechanisms, the two control edges 44 and 45 can be pivoted together or in each case independently of one another. As a result, the start and/or end of the injection process can be advanced or delayed and/or the amount of fuel to be injected can be increased or decreased. In practice, such control of the injection process and injection amount is controlled by controlling the pressure profile of the fuel supplied to the injection valve 1 in the supply conduit 2 by opening and closing the control conduit 33 within the control mechanism. This is done by changing the As can be seen in FIGS. 5 and 6, the control piston 35 includes a piston body 48 having an upper control lip 44 and teeth 49, and a sleeve-shaped piston circumference rotatably supported on the piston body 48. It consists of 50. The piston circumference 50 has a lower control edge 45 and teeth 51 . The piston body 48 has a piston head 52 having a cylindrical cross section. This piston head 52 has an upper control lip 44 on its end face;
It is guided into the pump cylinder 41 on its cylindrical circumferential surface as liquid-tight as possible, ie with very little play. The piston head 52 is bounded by a ring surface with a flat bottom.
a cylindrical bearing shaft 5 with a smaller diameter than 2;
3 is connected. A piston circumferential portion 50 is rotatably supported on this bearing shaft 53 and is secured against indirect movement in the axial direction with respect to the bearing shaft 53. In this case, the piston circumference 50 is primarily secured axially to the piston body 50 by a holder 55 which is fixed to the lower part of the bearing shaft 53 by means of a pressure pin 54 . The bowl-shaped holder 55 serves to define the spring force of the pressure spring 56. The other end of the push spring 56 is supported by a corresponding surface on the pump casing 40. The holding body 55 and the control piston 35 form a rigid unit in the axial direction due to their connection with the pressure pin 54. This unit is connected to a tappet 57 under pressure by a pressure spring 56. This tappet 57 scans the control cam 39 with its roller 58 or is pivoted to another actuating member.

Control mechanism 3 shown in FIGS. 1, 3 and 5
4, teeth 49 are formed on the bearing shaft 53, which serve to adjust the piston body 48 and thus the upper control edge 44. On the other hand, the second
In the control mechanism 34 shown in FIGS. 4 and 6, the teeth 51 are integrally molded on the outside of the adjustment sleeve 59. In the control mechanism 34 shown in FIGS. This adjusting sleeve 59 is fixed against rotation on the bearing shaft 53 below the piston circumference 50. The rotational protection between the adjusting sleeve 59 and the part of the bearing shaft 53 covered by the adjusting sleeve 59 is achieved, for example, by a form-fitting connection of the two parts. The bearing shaft 53 has a cross section other than a circle, for example rectangular or square, or has external toothing, to which the through hole of the adjusting sleeve 59 is aligned.

In the embodiment shown in FIGS. 1, 3 and 5, teeth 49 and 51 are located at approximately the same height. In this case, the toothing 49 integrally formed on the bearing shaft 53 is accessible from the outside through a window-like recess 60 formed in the piston circumference 50.
The piston circumference 50 in each of the illustrated embodiments has a cylindrical partial region 61 adjacent to the piston head 52. The diameter of this partial region 61 is equal to or slightly smaller than the diameter of the piston head 52. 5 teeth at the bottom
A lower control edge 45 and a groove 47 forming this control edge 55 are arranged inside the partial region 61 to which 1 is connected. The section 62 of the subregion 61 above the groove 37 forms a blocking element, with which the second control line can be blocked by covering the outlet of the transverse hole 463.

To enable their rotation, a control rod 63 or 64 with straight teeth is assigned to the piston circumference 50 and the piston body 48 as adjustment elements. In this case, the control rod 63 meshes with the teeth of the piston body 48 with its teeth, and the control rod 64 meshes with the teeth 51 of the piston circumference 50 with its teeth. Both control rods 63 and 64 are mounted axially movably in corresponding holes in the pump casing 40 and are connected to an adjustment or regulation and control mechanism 65 external to the pump chamber.
and 66. The adjustment and control mechanisms 65, 66 are only shown schematically in the drawings with regard to their construction and attachment to the control rods 63 or 64.

The adjusting mechanism can be a hydraulically actuated transmission element or an electric adjusting motor.
Both adjustment or adjustment and control mechanisms 65, 66
Each consists of an electric step motor. The step motor receives adjustment pulses from the microprocessor. This microprocessor calculates the appropriate angular position of the control edge 44 or 45 in relation to operating characteristic values varying from inside and outside the engine.

In FIG. 7, the mutual relationship of the control edges 44 and 45 and the relationship of the control edges 44 and 45 to the relief hole 37 and the transverse hole 463 whose outlet cross section is controlled to open and close are shown. This is shown schematically in the following sections. FIG. 8 shows a pressure/time diagram. This diagram schematically shows the pressure and time ratios and their variation possibilities which can be achieved by means of the invention during the injection process.

In FIG. 8, point E is the point at which the block pump 3 starts to be discharged or the control valve 3 from the high pressure accumulator 25.
0 represents the point in time when fuel starts flowing out. On the other hand, point F represents the end of the discharge by the block pump 3 or the end of fuel outflow from the high pressure accumulator.The time period between points E and F is longer than the maximum duration of the injection process. It's getting longer. P _F indicates the pressure of the fuel delivered via the supply line 2 towards the injection valve 1 on the vertical axis. As already mentioned, this pressure is indicated by the symbol in Figure 8.
It is chosen to be significantly higher than the opening pressure of the injection valve 1, which is indicated by P _E.

In FIGS. 7 and 8, point A indicates the earliest possible start of injection, and point B indicates the latest possible start of injection. Point C indicates the earliest possible end of injection, whereas point D indicates the latest possible end of injection. By rotating only the control lip 44, ie moving it to the left in the plane of the drawing, it is possible to delay the start of injection from point A to point B. On the other hand, if only the control edge 45 is rotated and moved to the right in the drawing plane, the end of injection can be delayed from point C to D. By rotating the upper control edge 44 and the lower control edge 45 simultaneously, the start of injection is accelerated or delayed between points A and B, and the end of injection is accelerated between points C and D. In addition to delaying the injection, the amount of fuel to be injected can be controlled.

Therefore, the injection device of the present invention makes it possible to appropriately select the fuel injection for each load range of the internal combustion engine in terms of fuel consumption.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a schematic diagram of the first embodiment of the injection device of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the injection device of the present invention, FIG. 3 is a schematic diagram of a third embodiment of the injection device of the present invention, and FIG. 4 is a fourth embodiment of the injection device of the present invention. 5 is an enlarged view of a portion of FIGS. 1 and 3, FIG. 6 is an enlarged view of a portion of FIGS. 2 and 4,
FIG. 7 is a schematic diagram of a control edge showing the start and end of injection and changes in the amount of injected fuel, and FIG. 8 is a pressure/time diagram showing the start and end of injection and changes in the amount of injected fuel. DESCRIPTION OF SYMBOLS 1... Injection valve, 2... Supply conduit, 3... Block pump, 4... Pump plunger, 5... Cam, 6... Pump cylinder, 7... Pump casing, 8... Valve holder, 9... ...Outflow passage, 10...
... Pressure valve, 11 ... Connection piece, 12 ... Pump pressure chamber, 13 ... End face, 14 ... Suction hole, 15 ... Suction chamber, 16 ... Suction conduit, 17 ... Pressing pin, 1
8... Holding body, 19... Pressing spring, 20... Flange, 21... Support surface, 22... Tappet, 23
... hole, 24 ... roller, 25 ... high pressure accumulator,
26...transport pump, 27...tank, 28...
Pressure maintenance valve, 29... Overpressure conduit, 30... Control valve, 31... Control device, 32... Check valve, 33...
... Control conduit, 34 ... Control mechanism, 35 ... Control piston, 36 ... Pressure relief chamber, 37 ... Relief hole, 3
8... Pressure relaxation chamber, 39... Control cam, 40...
Pump casing, 41... Pump cylinder, 4
2... Connection piece, 43... Inflow hole, 44, 45...
Control edge, 46... Conduit, 47... Groove, 48...
Piston body, 49...teeth, 50...piston circumference, 51...teeth, 52...piston head, 5
3...Supporting shaft, 54...Press pin, 55...
... Holding body, 56 ... Pressing spring, 57 ... Tappet, 58 ... Roller, 59 ... Adjustment sleeve, 6
0... Notch, 61... Partial range, 62... Section, 63, 64... Control rod, 65, 66... Adjustment or adjustment/control device.

Claims (1)

[Claims for Utility Model Registration] 1. A fuel injection device for an internal combustion engine, which supplies fuel to an injector 1 via a supply conduit 2, and related to changing operating characteristic values of the internal combustion engine. (a) the fuel supply device is controlled synchronously with the internal combustion engine to control the fuel injection process for each injection process; a fuel preparation device 30, 25-30 for supplying fuel into the supply conduit 2 leading to the injection valve 1 at a pressure higher than the opening pressure of the injection valve 1 for a time longer than the maximum injection time that can be given to the injection valve; (b) A control conduit 33 is connected to the supply conduit 2, and a control mechanism 34 having a rotatable control piston 35 is connected to the control conduit 33, and the control mechanism 34 has a rotatable control piston 35. The piston 35 is actuated axially in synchronization with the fuel preparation device 30, 25-30 to close or open the connection between the control conduit 33 and the pressure relief point depending on the axial position of the control piston 35. The control piston 35 has a pair of control edges 44, 45 arranged obliquely with respect to the piston axis.
The control edges 44 and 45 control the control conduit 3 according to the rotational position of the control piston 35.
(c) The injection amount is changed by controlling the cutoff timing and opening timing of the connection between 3 and the pressure release point to advance or delay the injection start and/or end timing of the injection process; (d) the control piston 35 of the control mechanism 34 is configured to be able to rotate both control edges 44, 45 relative to each other; (d) each of the two control edges 44, 45 has a control and adjustment mechanism 65; 66 are assigned, and these rotation mechanisms 49, 63, 51,
Fuel injection device for an internal combustion engine, characterized in that 64 allows both control edges 44, 45 to be rotated together or independently of each other. 2. A block pump 3 with a reciprocating pump plunger 4 without a control edge is used as a fuel preparation device, said pump plunger 4
The fuel injection device according to claim 1, wherein the fuel injection device is operable by a conveying cam 5 disposed on a camshaft driven by a crankshaft of an internal combustion engine. 3. The fuel preparation device is a high-pressure accumulator 25 to which fuel is supplied by a transfer pump 26, and the fuel in this high-pressure accumulator 25 is maintained at a predetermined pressure level by a pressure maintenance valve 28.
5 is provided with a control valve 30 for blocking or opening a fuel conveyance path for supplying fuel to the injection valve 1 via the supply conduit 2.
The fuel injection device according to claim 1, wherein the fuel injection device has an electromagnetically or electrically/hydraulically controlled shutoff mechanism connected to the control device 31. 4 The control conduit 33 is connected to the fuel tank 27 as a pressure relief point, and the fuel tank 27
The fuel injection device according to any one of claims 1 to 3, from which fuel can be taken out by the block pump 3 or the transfer pump 26. 5 the control conduit 33 is connected to at least the control mechanism 34;
The fuel according to any one of the claims 1 to 4, which has a significantly smaller cross-section than the supply conduit 2 leading to the injection valve 1 in the region before the injection valve 1 . Injection device. 6. The control mechanism 34 is constituted by a functionally modified injection pump, whereby the fuel supplied to the injection valve 1 via the supply conduit 2 is separated from the control conduit 33 and the pressure relief point. The fuel injection device according to any one of claims 1 to 6, wherein the fuel injection device is controlled by opening/closing control of a connection. 7 The injection pump constituting the control mechanism 34 sends fuel to the block pump 3 or to the high pressure accumulator 25.
The fuel injection device according to claim 6, which is significantly smaller than the conveying pump 26 that supplies the fuel. 8 In order to form the control mechanism 34, the pressure chamber of the injection pump is functionally converted into a pressure relief chamber 36, the suction hole is functionally converted into a relief hole 37, the suction chamber is functionally converted into a pressure relaxation chamber 38, and this pressure relaxation Room 38
The fuel injection device according to claim 6 or 7, wherein the fuel injection device communicates with the fuel tank 27. 9 Utility model registration claims 1 to 8, in which a control cam 39 driven synchronously with the internal combustion engine is assigned to the control piston 35 of the control mechanism 34 in order to actuate this control piston 35 The fuel injection device according to any one of the above. 10 In order to rotate the control piston 35 of the control mechanism 34, a rotation mechanism 4 is attached to the control piston 35.
9, 51, 63, 64 and control and adjustment mechanisms 65, 66 for operating the same are assigned, as described in any one of claims 1 to 9 of the utility model registration claims. fuel injector. 11 The control conduit 33 is branched into two conduits inside the control mechanism 34 , which open into a pressure relief chamber 38 , which also forms part of the control conduit 33 . From 38 a control conduit 33 leads to the fuel tank 27 and a first conduit 43 inside the control mechanism 34,
36 , 37 can be opened and closed by the upper control lip 44 of the control piston 35 and the second conduit 46 is connected to the lower control lip 4 of the control piston 35 .
Any one of claims 1 to 10 of the claims for utility model registration, which can be opened and closed by
A fuel injection device according to paragraph 1. 12 A first conduit path inside the control mechanism 34 is formed by the hole 43 of the connecting piece 42 that contacts the upper end surface of the control cylinder 41, the relief hole 37 communicating with the pressure relief chamber 36 and the pressure relief chamber 38. The fuel injection device according to claim 11 of the utility model registration claim. 13 Second conduit 46 inside control mechanism 34
However, a horizontal hole 461 and a vertical hole 462 branch from the hole 43 of the connecting piece 42 and extend inside the connecting piece 42.
, vertical holes and horizontal holes 463 and 464 extending inside the control cylinder 41, a groove 47 extending in the circumferential direction on the circumferential surface of the control piston 35, and a vertical groove branching from this groove 47 and extending on the circumferential surface of the control piston 35. 466 and a ring groove 46 surrounding the control cylinder hole.
5, the upper side wall of the groove 47 has a lower control edge 45, the horizontal hole 463 opens into the control cylinder hole, and the ring groove 46
5 is arranged below the horizontal hole 463, and the horizontal hole 4
64 branches from the ring groove 465 and opens into the pressure relief chamber 38, and the opening of the transverse hole 463 is controlled to open by the lower control edge 45 during the piston stroke of the control piston 35.
13. The fuel injection device according to claim 12, wherein the second conduit is in communication. 14 The control piston 35 comprises a piston body 48 with an upper control lip 44 and teeth 49 and a sleeve-shaped piston circumference rotatably supported on said piston body 48 with a lower control lip 45 and teeth 51. 50. The fuel injection device according to any one of claims 1 to 13 of the utility model registration claims. 15 The piston body 48 has a cylindrical piston head 52 which has an upper control lip 44 on its end face and which is guided in the control cylinder 41 as tightly as possible on its circumference.
A cylindrical support shaft 53 having a smaller diameter than this is connected below, and the piston circumferential portion 50 is supported on this support shaft 53 so as to be relatively rotatable and is held immovably in the axial direction. A fuel injection device according to claim 14 of the utility model registration claim. 16 The piston circumferential portion 5 is attached via a holder 55 fixed to the lower part of the support shaft 53 with a pressing pin 54.
0 is secured axially in the piston body 48 , said holder 55 forming the driver of the control piston 35 , and supported at one end in the casing 40 by a pressure pin 54 holding the holder 55 . forms a connecting member for a tappet 57, which tappet 57 is guided in the housing 40 and is pressed against the control cam 36 by means of a roller 58, which is loaded by a pressure spring 56 and is supported on this tappet 57. A fuel injection device according to claim 15 of the utility model registration claim. 17 Utility model registration claim No. 14, in which the teeth 49 of the piston body 48 are provided on a support shaft 53 that holds the piston circumferential portion 50.
16. The fuel injection device according to any one of paragraphs 1 to 16. 18 The teeth 49 of the piston body 48 are in contact with the piston circumferential portion 50 on the lower side of the piston circumferential portion 50 and are prevented from rotating.
The fuel injection device according to any one of claims 14 to 16, which is integrally molded on the outer peripheral surface of an adjustment sleeve 59 fixed to a support shaft 53 of 8. 19 The teeth 49 provided on the support shaft 53 of the piston body 48 and the teeth 51 provided on the piston circumferential portion 50 are arranged at approximately the same height position, and the teeth 49 provided on the support shaft 53 are arranged on the piston Window-shaped notch 6 provided in the circumferential portion 50
18. The fuel injection device according to claim 17, which is accessible from the outside through 0. 20 Adjacent to the piston head 52, the sleeve-shaped piston circumference 50 has a cylindrical partial region 6 with a diameter equal to or smaller than the diameter of the piston head 52.
1 and in which a circumferential groove 47 with a lower control edge 45 and teeth 51 below this groove 47 are arranged. fuel injector. 21 Both the piston circumferential portion 50 and the piston body 48, the piston circumferential portion 50 and the piston body 48
8, and in turn the piston circumferential portion 50.
and the control lip 4 arranged on the piston body 48
4, 45, control rods 63, 64 each having straight teeth are assigned, and these control rods 63, 64 engage the teeth 4 of the piston body 48 or the piston circumference 50 with their teeth.
9, 51 and is axially movably supported in the pump casing 40 and connected to an adjustment or regulation and control mechanism 65, 66 external to the pump casing 40;
A fuel injection device according to any one of claims 14 to 20 of the utility model registration claim. 22 A regulating and controlling mechanism with a microprocessor is assigned to both control edges 44, 45;
A fuel injection device according to any one of the holes set forth in claims 1 to 21 of the Utility Model Registration Claims.