JP2766581B2 - Emergency operation stop device for internal combustion engine - Google Patents

Abstract

The invention relates to an emergency cut-out device for internal combustion engines for returning the control rods (7) of injection pumps (6) to zero delivery when, due to a defect, filling control by the means provided is no longer possible. For this purpose a shaft (3) with two shaft sections (4, 5) is provided in the linkange between control element (1) and control rod (7), which shaft sections in normal operation are connected to one another by a torsionally rigid coupling (9) and are set in rotational movement by the control pulses of the control element (1). In the event of a fault, the coupling (9) is detached by axial separation of the coupling halves assigned to the two shaft sections (4, 5). An axial piston (20), to which pressure medium can be admitted and which is movable against the force of a spring (17) acting on the coupling (9) in the longitudinal direction of the shaft (3), serves for this purpose. In addition the shaft section (5) on the control rod side is equipped with a rotary piston (24) to which, in order to return the control rod (7) to zero delivery, pressure medium can be admitted. It is especially advantageous that the installation of the emergency cut-out device in the transmission path between control element (1) and control rod (7) does not increase the power received from the control element (1) in normal operation, which gives a good control capability. The design of the device with a shaft (3) and hydraulically actuated elements permits a simple construction with a single coupling (9) for low-backlash transmission of the control pulses. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The invention is based on the preamble of claim 1 in which in the event of a fault, the adjusting rod of the injection pump can return to the no-injection position without depending on the control actuator. The present invention relates to an emergency operation stop device for such an internal combustion engine.

[0002]

2. Description of the Related Art A stop device of this type is known from DE 39 23 123. Its return of the adjusting rod independent of the control actuator in the event of a failure is described in DE 39 23 123
In the case of the device according to the specification, the position movement of the control actuator is transmitted to the adjusting rod as a fixed connection during normal operation, and in the case of a malfunction, the internal combustion engine is provided by a previously provided operating device. Is enabled by a coupling that is released such that an emergency stop of the vehicle is performed.

[0003] This joint is formed by a sphere as a pawl element which, in normal operation, engages in the recesses of the shaft part on the adjusting element side and the shaft part on the control actuator side, and The shaft part is non-rotatably connected. The shaft portion is held by the electromagnet in an axial position corresponding to the blocking position. When the electromagnet is in a non-excited state, the shaft parts move axially away from each other, in which case the sphere simultaneously disengages radially from the recess in the shaft part on the adjustment rod side, whereby both shafts The parts are no longer interconnected.

The return of the shaft portion on the adjustment rod side to a position corresponding to the non-injection of the adjustment rod is performed by a torsion spring, which causes a return operation of the shaft portion on the adjustment rod side. In this embodiment of the device having a torsion spring, in normal operation, therefore, control A
The control movement of the control actuator when the actuator and the adjusting rod are interconnected via a coupling is converted into a rotational control movement of the correspondingly mounted shaft part. The disadvantage of this device is the requirement for constant electrical power. In addition, the disadvantage is that very high production costs have to be estimated for the production of complex devices.

[0005] German Utility Model No. 72 39 402 shows a hydraulically actuated emergency shutdown device. Due to the supply of pressure medium to the control piston which is directly connected to the adjusting rod, the adjusting rod is moved in the event of a fault to the non-injection position. In normal operation of the internal combustion engine, the adjusting rod is held in a position corresponding to the fuel supply by the injection pump by means of a pressure spring acting on the control piston. Other mechanical intermediate links have been avoided.

The simple construction of such a device, however, simply consists of two adjusting positions, ie one adjusting position, in normal operation, at a certain supply rate which can be adjusted by the adjusting screw. Yes, other positions are only possible because only two adjustment positions are provided, which are stop positions.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a control activator.
It has a problem of obtaining an emergency stop device for an internal combustion engine for performing a return operation of an adjustment rod for an injection pump to a non-injection position without depending on a heater , but is incorporated into a governor link for fuel injection. Does not require additional power consumption of the control actuator in normal operation of the internal combustion engine, thus allowing for good regulation performance, and the use of simple components for couplings and operating devices allows for simple construction Things.

[0008]

According to the present invention, this object is achieved by the features of claim 1 of the claims. The transmission of the control momentum takes place via a rotatably mounted shaft, which can be released in the event of a fault by means of a shaft piston on which a pressure medium is exerted in the longitudinal direction of the shaft. have. In normal operation, both joint halves are held together without play by springs acting in the longitudinal direction of the shaft as well. Also, this spring does not generate any rotational moment on the shaft during normal operation, so the control actuator
The eta or control motor is free to operate in the direction of fuel injection and in the direction of no fuel injection. Therefore, the power consumption of the control motor is not increased due to the incorporation of the emergency shutdown device. The frictional resistance and the pressure acting on the piston of the injection pump only have to be overcome by the control motor.

[0009] Therefore, good controllability is obtained. This is because the control force is small and the control force is of equal magnitude in both adjustment directions. The return of the partial shaft connected by the adjusting rod to the non-injection position is simply effected by the rotating piston under pressure. The configuration with a rotatable shaft, the fluid working performance of the joint as well as the fluid return in the event of a fault allow a simple construction with a simple joint that can be formed without play. In this case, it is advantageous, for example, to form a coupling element with a wedge-shaped pawl according to claim 2.

[0010] Advantageously, the partial shaft on the control actuator side is formed with a sleeve which is connected to a shaft member connected to the shaft piston and which is non-rotatable, wherein the spring is provided on the sleeve. And a preload is applied to the shaft member. In this case, the shaft member is movable in the axial direction with respect to the sleeve. Furthermore, according to claims 5 and 6, the pressure chamber in the shaft piston and the pressure chamber around the rotary piston are interconnected via a connecting conduit, in which case when the joint of the shaft is released. For the first time, the pressure medium reaches the pressure chamber around the rotating piston via the connecting conduit.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to FIGS. The emergency shutdown device shown in FIG. 1 basically consists of a shaft 3 which consists of two part shafts 4 and 5 and is rotatably mounted, the part shafts 4 and 5 being mutually connected by a joint 9. It is connected to. A control actuator , for example an electric control motor 1, is connected to the shaft 3 via a link 2, and an adjusting rod 7 for an injection pump 6 for an internal combustion engine is connected to the shaft 3 via a link 8. ing. Partial axis 4
And 5 are rotatably mounted in ball bearings 12, 13 and needle bearing 14. The ball bearing 13 also absorbs the generated axial force. The partial shaft 4 on the side of the control actuator is provided with a sleeve 16,
A spring 17 is arranged in the sleeve 16 in a compressed state and acts on a shaft member 15 extending into the sleeve 16. This embodiment allows axial displacement of the shaft member 15 within the sleeve 16.

However, the shaft member 15 and the sleeve 1
6 are non-rotatably connected to each other, for example, via a horizontal pin 28, which is inserted, for example, into an elongated hole in the shaft member 15. A wedge-shaped claw 10 of one joint half is arranged on the shaft member 15, and this claw 10 engages with a wedge-shaped claw 11 of another joint half of the partial shaft 5 on the adjustment rod side. doing. A pressure chamber 19 is formed in the region between the two coupling halves,
In the event of a fault, the pressure medium, preferably the lubricating oil of the internal combustion engine, is led to 9 via conduit 27 and valve 18. Shaft member 1
5 are simultaneously connected to the shaft piston 2
0, and this axial piston 20
As is evident from FIG.

Another pressure chamber 22 as shown in FIG. 2 is formed in contact with the partial shaft 5 on the adjustment rod side, and the pressure chamber 22 is connected to the pressure chamber via a connecting conduit 21 and an inflow hole 25. The medium arrives and acts on the rotating blades 23 of the rotating piston 24, which is arranged on the partial shaft 5 on the adjusting rod side. The chambers behind the rotating blades 23 each have a vent hole 26. The connection conduit 21 to the pressure chamber 22 is only released when the connection between the partial shafts 4, 5 is broken. For this purpose, the connecting conduit 21
Is connected to the outflow hole of the pressure chamber 19 which is covered by the peripheral surface of the shaft piston 20 during normal operation of the internal combustion engine. The connecting conduit 21 is only released when the shaft piston 20 is in a position corresponding to the release position of the coupling 9.

In normal operation of the internal combustion engine, both halves of the joint 9 attached to both the partial shafts 4, 5
Since they are held in contact with each other by the spring 17, the control movement of the control actuator 1 is transmitted to the adjusting rod 7 without play. Since the spring 17 acts in the longitudinal direction of the shaft 3 and exerts no rotational moment on the shaft 3, the input of the control actuator 1 is not affected by the configuration of the emergency shutdown device. Therefore,
At the same time, the ability to adjust is improved. This is because the control force is small and a symmetrical adjustment relationship is generated.
In the event of a malfunction, for example, in which adjustment is no longer possible due to a defect in the control actuator 1, the valve 18 is activated and the pressure medium, preferably the lubricating oil of the internal combustion engine, is supplied via line 27 to the pressure medium. The inside of the room 19 is reached.

Upon receiving sufficient pressure, the coupling half on the side of the control actuator 1 is returned against the action of the spring 17,
Thereby, the joint 9 is released (separated). When the coupling 9 is released, the pressure medium from the pressure chamber 19 via the connecting conduit 21 reaches the pressure chamber 22, whereby the rotary piston 24 and the adjusting rod 7 are brought into a position corresponding to no injection. Is restored.

[0016]

The present invention according to the present invention, since a configuration and action as described above, control of the injection pump in the event of failure Accession
An effect of being able to provide an emergency stop device for an internal combustion engine with a simple configuration and low power consumption for a return operation of the adjustment rod to the non-injection position without depending on the tutor is exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing one embodiment of an emergency operation stop device according to the present invention.

FIG. 2 is a cutting line II of the emergency shutdown device shown in FIG. 1;
FIG. 2 is a cross-sectional view seen in the direction of −II.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 control actuator 2 link 3 shaft 4 partial shaft 5 partial shaft 6 adjusting element 7 adjusting rod 8 link 9 joint 10 wedge-shaped claw 11 wedge-shaped claw 12 ball bearing 13 ball bearing 14 needle bearing 15 shaft member 16 sleeve 17 spring 18 Valve 19 Pressure chamber 20 Pressure chamber 21 Connecting conduit 22 Pressure chamber 23 Rotating blade 24 Rotating piston 25 Inlet hole 26 Vent hole 27 Duct

──────────────────────────────────────────────────の Continuing on the front page (73) Patentee 391013243 OLGASTRASSE 75, 88045 FRIEDRICH SHAFEN, GERMANY (72) Inventor Dietrich Koch Germany, 7992 Tettnang, Schöneckstrasse 19 (58) Fields studied (Int) .Cl. ⁶ , DB name) F02D 17/04 F02D 1/02 311

Claims (6)

(57) [Claims] An emergency stop device for an internal combustion engine, comprising: a control actuator for driving an adjusting rod of an injection pump to adjust a fuel supply amount in response to a load request; A rotatably supported shaft comprising a first partial shaft on the control actuator side and a second partial shaft on the adjustment rod side for transmitting a control operation of an actuator to the adjustment rod; A first and a second partial shaft, the shaft being releasably connected by a joint member formed at each end of the partial shaft, and a link disposed between the control actuator and the shaft. Releasing the connection between the first and second partial shafts by separating the joint member in the axial direction, and rotating the second partial shaft independently of the first partial shaft to thereby prevent the injection pump from operating. Adjust the injection position Means for resetting the rod, said means for stopping the internal combustion engine, said means being arranged to move axially on said first partial shaft by means of a pressure medium received and acting in the pressure chamber in the event of a fault. An axial piston which is guided to release the connection between the first and second partial shafts, the second axial shaft being released from the first partial shaft in the event of a failure, and An emergency operation stop device for an internal combustion engine, comprising: a rotary piston that rotates and returns to a corresponding position. 2. The emergency operation stop device for an internal combustion engine according to claim 1, wherein said joint member is formed as a wedge-shaped claw. 3. The control operation of the control actuator ,
The power is transmitted to a sleeve rotatably supported on the first partial shaft, and the sleeve is connected to a shaft member connected to the joint member and the shaft piston on the side of the control actuator so that the sleeve cannot rotate. And wherein a spring is compressed and disposed within the sleeve to apply a force to the shaft member, and the shaft member is axially movable relative to the sleeve. Item 7. An emergency operation stop device for an internal combustion engine according to item 1 or 2. 4. The emergency operation stop device for an internal combustion engine according to claim 1, wherein lubricating oil for an internal combustion engine is used as the pressure medium. 5. A pressure chamber adjacent to said shaft piston and another pressure chamber around said rotary piston are interconnected via a connecting conduit, and a connection between said first and second partial shafts. Internal combustion engine according to any of the preceding claims, wherein the flow of the pressure medium via the connecting conduit into the further pressure chamber around the rotary piston only takes place when is released. Emergency stop device. 6. The connection conduit is connected to an outlet hole of the pressure chamber adjacent to the shaft piston, the outlet hole being covered by a peripheral surface of the shaft piston when the connection is not released. 6. The emergency stop device for an internal combustion engine according to claim 5, wherein the outflow hole is opened only when the shaft piston is at a position corresponding to a release position of the coupling member.