JPH05209538A - Load adjuster for driven machine - Google Patents

Abstract

PURPOSE: To provide a load-adjusting device for an improved vehicle driving mechanism allowing emergency running operation at a high idling rotation an the electrically adjusting drive apparatus has a failure. CONSTITUTION: An adjusting member 11 is formed to be retained, during non- operation of an adjusting drive apparatus, by a stopper 15 at a predetermined position outside a normal adjusting range A under action of a spring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load adjusting device for a driving machine, particularly for a driving machine of a vehicle, which comprises an adjusting member for determining an output of the driving machine, the adjusting member being controlled by a control mechanism. It is of the type which can be adjusted and moved within the normal adjustment range by means of possible adjustment drives.

[0002]

In known load control devices of the type mentioned above for vehicles which are driven by an internal combustion engine, an actuating element, for example an actuating element, for example in the adjusting position of the accelerator pedal, acts on an adjusting element in the form of a throttle flap or an injection pump and returns. The transmission of the adjusting element, which is loaded in the idling operating adjusting direction by the spring, to the adjusting position takes place over the entire adjusting range of the adjusting element in an electromechanical manner via an electric adjusting drive which can be controlled by an electronic control mechanism. Such an electronic transmission system makes it possible to use an electronic control mechanism to alter the transmission of the adjusting position of the accelerator pedal to the adjusting position of the adjusting member. Such interventions are used, for example, to avoid wheel slips that result from high power, especially at start-up, to limit the drive speed and / or the speed of the drive machine and / or to keep the drive speed constant. can do. Other interventions are required, for example, if the gearbox should be switched automatically, or if different outputs are required and the idling speed should be controlled to a constant value during idling. Is.

In the case where the electric adjustment drive device is in a non-energized state due to a failure of a component of the transmission system, a spring-loaded stopper is provided in the direction opposite to the idling adjustment direction, and is provided by the return spring. The loaded adjusting member is held by this stopper at a position that determines the throttle flap opening during high idling rotation, that is, the throttle flap opening during emergency idling. The throttle flap opening during emergency idling makes it possible, for example, to move out of the danger range with a second gear or to stop at the next factory.

In this case, the return spring has an action in the direction opposite to that of the return spring, and the stopper spring set to a spring force stronger than that of the return spring is in the normal operating state during control of the throttle flap opening during idling. The drawback is that it causes problems. That is, the adjusting drive acting against the return spring when the adjusting member is to be operated by the adjusting drive in the idling adjustment direction beyond the position defined by the spring-elastic stop suddenly causes the action of the return spring. Must act against the stopper spring acting in the opposite direction. Therefore, this requires a reversal of the torque direction as well as a higher torque within the range of the position of the adjusting member defined by the stopper. It has also been shown in practice that permanent holding torque of motors often causes problems, because higher motor currents are required due to the spring force of the stoppers, but less heat is exhausted due to the smaller air flow. Because it is nothing more. On the other hand, the size of the motor is also largely limited by the assembly conditions.

[0005]

The object of the present invention is to overcome the abovementioned drawbacks of the known load control devices.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a load adjusting device of the type mentioned at the outset in which the adjusting member is normally under the action of a spring when the adjusting drive is inactive. It is configured to be held at a position defined by the stopper outside the adjustment range.

[0007]

In the case of a load adjusting device for a drive machine of a vehicle, the position of the adjusting member, defined by the stop, outside the normal adjustment range, defines a high idling rotation of the drive machine, which in an emergency situation. Allows driving operation. In drive machine load balancers for other purposes, this position of the adjusting element outside the normal adjustment range is sufficient so that the drive machine does not stop under all possible circumstances, especially during cold motor operation in winter. It would be sufficient to specify a high idling rotation. On the other hand, in certain applications, it may be advantageous to keep the drive machine running at a constant partial load in the event of a regulated drive failure.

According to a first embodiment of the invention, the adjusting member is movable under the action of a spring beyond the closed position and the position defined by the stop is beyond the closed position of the adjusting member. is there. The advantage of this arrangement is that the spring causes the adjusting member to move in the closing direction when the adjusting drive is actuated.

According to a second embodiment, the adjusting member is movable under the action of a spring beyond its maximum open position, and the position defined by the stop lies beyond the open position of the adjusting member. is there. The advantage of this embodiment is that, in the event of a failure, the adjusting drive causes an excessive adjusting movement of the adjusting member irrespective of the direction, so that the adjusting member is always moved to the closed position.

The present invention has proved to be particularly advantageous in load adjusting devices in which the adjusting member is a throttle flap, which, in contrast to the prior art, is additional or special in construction of the invention. This is because the formed component is not necessary.

The stop can advantageously be arranged on the throttle housing and cooperates with a projection provided on the throttle shaft.

When the position of the throttle flap defined by the stop is beyond the open position, another stop cooperating with the other projection of the throttle shaft, and which is preferably adjustable May be provided in the throttle casing, this stop defining a minimum idling rotation of the throttle flap within the normal adjustment range of the throttle flap.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The throttle flap 1 of the known load adjusting device shown in FIGS. 1 and 2 is loaded in the idling adjusting direction (spring force F1) by a spring, a so-called return spring (not shown).

An electric adjustment drive device (not shown) is used for load adjustment.
The electronically regulated drive is controlled by an electronic control mechanism (not shown). The electronic control mechanism receives an electrical signal corresponding to the adjusted position of an actuating member, such as an accelerator pedal (not shown). The adjustment range A of the throttle flap 1 extends from the position that determines the throttle flap opening MLL at the time of minimum idling rotation shown by the solid line in FIG. 1 to the full load position, for example, the maximum opening position of the throttle flap shown by the chain line. There is.

The throttle lever 3 is connected to the throttle shaft 2 so as not to rotate relative to it, and the throttle lever 5 is loaded in the idling adjustment range of the throttle flap 1 by a spring 4 in the direction opposite to the idling adjustment direction. Is in contact with the spring 4, and the spring force F2 of the spring 4 is
Is greater than the spring force F1 of the return spring. The casing 6 of the spring-loaded stopper 5 is fixed in the stationary component 7 by means of a screw connection.

In the operating state of the electric adjusting drive, the spring force F2 acting in the idling adjusting range by the electric adjusting drive is overcome, which of course requires reversal of the torque direction as well as a higher torque as described above. To do.

When the electric adjustment drive device fails for some reason, the spring-loaded stopper 5 takes a projecting position (FIG. 2), and the throttle flap 1 has a throttle valve opening ELL during high idling rotation, that is, during so-called emergency idling. The throttle valve opening is maintained at a fixed position, which is used for emergency driving (for example, in the second gear).
To enable. The screw connection between the casing 6 of the stopper and the stationary component 7 makes it possible to adjust the opening of the throttle flap 1 to the stopper 5, and thus the throttle flap opening ELL during high idling rotation.

Another screwed into the stationary component 7
Two adjustable stoppers 8 are on the throttle flap 1,
Throttle flap opening MLL at minimum idling speed
Determine the position to set. This stopper may be formed by the casing 6 so that the component
One is omitted.

In the first embodiment of the invention shown in FIG. 3, the throttle flap 11 is also loaded in the idling adjustment direction by a spring (not shown) with a spring force F1. Adjustment movement is performed by an adjustment drive,
The normal adjustment range A of the throttle flap 11 is the maximum opening position (90 ° -position) from the position shown by the dotted line in the figure, which defines the throttle flap opening at the time of minimum idling rotation.
To the full load position indicated by the dashed line.

When the adjusting drive device fails, the throttle flap 11 exceeds the maximum closing position (0 ° -position) in the idling adjusting direction from the normal adjusting range A by the above-mentioned spring, and the throttle flap 11 is operated at high idling speed or emergency idling. The flap opening ELL can be turned to a predetermined position. In this position, the throttle lever 13 connected to the throttle shaft 12 abuts on a stopper 15 screwed into the stationary component 14. This stopper 15 may be a cast projection, ie a non-adjustable stopper, if the manufacture is sufficiently precise. Determine the throttle flap opening ELL at high idling speed or the throttle flap opening ELL at idling emergency.
The position shown in solid lines is in a preferred configuration a stationary component 1.
It can be adjusted as desired by means of a screw connection between 4 and the stopper 15.

Since the throttle flap 11 turns extremely quickly from the normal adjustment range A to the position where the throttle flap opening ELL is set at the time of high idling rotation, the internal combustion engine stops when the throttle flap passes the 0 ° -position. There is no such thing. On the other hand, there is no motor speed required to form an air-fuel mixture that can be ignited when the motor is started.

The particular advantage of this embodiment is that the drawbacks of the prior art shown in FIGS. 1 and 2 are overcome without the need for additional components. More precisely, in order to carry out the invention, the components (springs, fixed stoppers) which are always necessary for other actions are used. Moreover, this embodiment has the advantage that the throttle flap 11 is actuated in the closing direction by a spring in the event of an adjustment drive failure.

In the embodiment shown in FIGS. 4 to 6, the throttle flap 21, which can be adjusted and moved within the normal adjustment range A by means of the adjusting drive, is actuated by a spring (not shown) in the direction opposite to the idling adjustment direction. , That is, in the full load adjustment direction (F3).

In the case of a malfunction of the adjusting drive, in this embodiment the throttle flap 21 is in the maximum open position (90 °) in the full load adjusting direction from the normal adjusting range A by means of the spring described above.
The throttle flap opening EL at the time of high idling rotation or emergency idling beyond the position
The L is swung to a predetermined position (solid line), and at this position, the projection 23 provided on the throttle shaft 22 contacts the stopper 25 provided on the throttle casing 24.

Another projection 26 provided on the throttle shaft 22 cooperates with another stopper 27 arranged on the throttle casing 24, and this stopper defines the throttle flap opening MLL at the minimum idling rotation. Determine the position of. Protrusions 23 and 2
6 can also be integrated into one protrusion. Stopper 2
5,27 are adjustable in an advantageous configuration, but may in principle also be non-adjustable stops.

The particular advantage of this embodiment is that the adjusting drive in either direction causes the throttle flaps to be excessively adjusted in the event of a fault, so that the throttle flaps are always moved to the closed position.

It will be appreciated that the illustrated arrangements described are to be seen merely as an example and the invention is not limited to this example. The invention can therefore be used in load adjusting devices, where the adjusting member does not include a throttle flap and is, for example, a control rod of a diesel engine injection pump or an adjusting lever of an electric drive machine. The spring loading the adjustment member may be of any type, for example a tension spring, a compression spring or a torsion spring, and a component on or in connection with the adjustment member itself, for example the throttle lever or throttle of FIG. It can be adapted to act on the shaft. The adjusting drive device of the load adjusting device is not necessarily an electric adjusting drive device, and may be a hydraulic or pneumatic drive device, a magnet drive device, or the like. The adjusting drive can act on the adjusting member directly or via an adjusting component connected to it, for example a throttle lever, a throttle shaft or the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state in which a throttle flap is in a position at the time of minimum idling in a load adjusting device of the related art.

2 is a schematic view of the device of FIG. 1 with the throttle flap in an emergency idling position defined by a spring-loaded stopper.

FIG. 3 is a schematic view of a throttle flap of the load adjusting device according to the first embodiment of the present invention.

FIG. 4 is a vertical sectional view of a throttle casing of the load adjusting device according to the second embodiment of the present invention.

5 is a plan view of the throttle casing of FIG. 4. FIG.

FIG. 6 is a view as seen from the direction shown by arrow VI in FIG.

[Explanation of symbols]

1,11,21 Throttle flap, 2,12,2
2 Throttle shaft, 3,13 Throttle lever, 4
Spring, 5,8,15,25,27 Stopper, 6
Casing, 7, 14 Components, 23, 26
Protrusion, 24 throttle casing

Front page continued (72) Inventor Georg Haupner, Federal Republic of Germany Berg Oberpfalz Ludwigstraße 1 (72) Inventor, Hartmut Zeble, Furthmost Strasse, Germany 25 (72) Inventor Andreas Lepich, Federal Republic of Germany Leonberg, Wilhelmstraße 43 (72) Inventor Erik Menle, Federal Republic of Germany Oberkirch Freiwald 4

Claims (9)

[Claims] 1. A load adjusting device for a drive machine, comprising an adjusting member for determining an output of the drive machine,
In the type in which the adjusting member is adjustable and movable within the normal adjusting range by the adjusting drive controllable by the control mechanism, the adjusting member (1
1, 21) is configured to be held under the action of the springs (F1, F3) at a position outside the normal adjustment range (A) defined by the stoppers (15, 25). A load adjusting device for a drive machine. 2. The load adjusting device according to claim 1, wherein the position of the adjusting member (11, 21) defined by the stopper (15, 25) defines the idling rotation of the drive machine. 3. The load adjusting device according to claim 1, wherein the position of the adjusting member (11, 21) defined by the stopper (15, 25) defines a high idle rotation (ELL) of the drive machine. .. 4. The load control device according to claim 3, wherein the high idling rotation (ELL) enables traveling operation in an emergency. 5. The adjusting member (11) is movable under the action of a spring (F1) beyond the closed position and the position defined by the stopper (15) exceeds the closing position of the adjusting member (11). The load adjusting device according to any one of claims 1 to 4, which is in a closed position. 6. A position in which the adjusting member (21) is movable under the action of a spring (F3) beyond the maximum open position and the position defined by the stopper (25) exceeds the open position of the adjusting member. The load adjusting device according to any one of claims 1 to 4, wherein: 7. The load adjusting device according to claim 1, wherein the adjusting member (11, 21) is a throttle flap. 8. The load adjusting device according to claim 7, wherein the stopper (25) is provided on the throttle casing (24) and is adapted to cooperate with a projection (23) provided on the throttle shaft. .. 9. Another projection (26) on the throttle shaft
Another stop (27) cooperating with the throttle casing (24) is provided to determine the minimum idle throttle throttle flap position (MLL) within the normal throttle flap adjustment range (A). The load adjusting device according to claim 8.