JPH0642376A - Throttling device - Google Patents

Abstract

PURPOSE: To eliminate requirement of an additional means for adjusting a stopper position by, in a throttle device comprising a throttle mechanism stopper, adjusting a mounting position of an adjusting drive device for driving throttle flap about a rotational axis, and adjusting the stopper position. CONSTITUTION: A throttle mechanism of an internal combustion engine has a throttle flap 10 attached to a shaft 8 rotated by an adjusting drive device 6 such as an adjusting motor. A pin 32 forming a throttle mechanism stopper 34 is fixed through the shaft 8 in a direction lateral to a rotational axis 12. The pin 32 can be engaged with an adjusting drive device stopper 36. Further, a spring 40 with one end fixed to a throttle casing 2 is engaged at the other end with the pin 32. The spring 40 energizes the pin 32 in a direction to rest on the stopper 36. Then, the adjusting drive device 6 in a state of slacking a screw 20 can rotate about the axis 12 as the screw 20 engages with an arc- shaped groove 26, so that a stopper position is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle device for controlling the output of an internal combustion engine, which has a throttle casing, an operable throttle mechanism, an adjusting drive device, and a throttle mechanism stopper connected to the throttle mechanism. The throttling mechanism is supported in the throttling casing and is adjustable by an adjusting drive so that the turning movement of the throttling mechanism is limited by the counter stopper. The present invention relates to a type in which the position can be regulated, and the diaphragm mechanism occupies the stopper position by the contact between the diaphragm mechanism stopper and the counter stopper.

[0002]

2. Description of the Related Art There is a diaphragm casing provided with a diaphragm casing and a diaphragm mechanism operable by an adjusting drive device. In this case, the diaphragm mechanism is provided with a diaphragm mechanism stopper, and the diaphragm casing is provided with a diaphragm casing stopper. The diaphragm mechanism stopper contacts the diaphragm casing stopper,
As a result, the stopper position of the diaphragm mechanism is obtained. The stop position defines, for example, the minimum idling operating position of the internal combustion engine. The throttle casing stopper has an adjustable adjusting screw. By turning the adjusting screw, the stop position is changed, that is to say via the adjusting screw, for example, the minimum idling operating position of the internal combustion engine is adjusted.

A disadvantage of such a known throttle device is that at least one additional adjusting screw is required, which makes it possible to adjust the throttle mechanism to the adjusting drive in the adjustment of the stop position, ie in the adjustment of the minimum idling operating position. The position will also change unfavorably. A further disadvantage is that the adjustment of the throttle mechanism with respect to the adjusting drive takes place only after the adjusting drive is installed in the throttle housing.

[0004]

In order to avoid the above-mentioned drawbacks of the prior art, in the arrangement according to the invention the counterstop is connected to the adjusting drive so that the stop position of the throttle mechanism can be changed by adjusting the adjusting drive with respect to the throttle casing. It has become.

[0005]

With the above arrangement of the invention, the relative position of the diaphragm mechanism with respect to the adjusting drive remains unchanged during adjustment of the stopper position. Furthermore, additional adjusting means can be omitted.

In an advantageous embodiment of the invention, the adjusting drive is associated with at least one sensor for detecting the position of the diaphragm mechanism, in which case the sensor signal of the sensor does not change during the adjustment of the stop position.

In another aspect of the present invention, at least a portion of the adjustment drive and the aperture mechanism form a pre-assembled component that is adjustable and inspectable prior to installation in the aperture casing. is there.

Further, in the present invention, if the adjusting drive is provided with a sensor, the pre-assembled component unit is the adjusting drive, at least part of the throttle mechanism, and the sensor is a separate adjusting device or test from the aperture casing. It is designed to be adjusted or inspected by the device. Therefore, after the combination of the pre-assembled structural unit and the diaphragm casing, there is no displacement of the relative position of the diaphragm mechanism with respect to the adjusting drive, and thus no change in the sensor signal of the sensor when adjusting the stopper position.

An adjusting drive is attached to the throttle casing with fixing screws. If the notch through which the fixing screw penetrates is designed to be somewhat larger in the adjusting direction of the adjusting drive, a particularly simple and low-part advantageous construction is obtained.

If a spring for returning the throttle mechanism is pivotally mounted on the adjusting drive, the return force of the spring cannot be changed when adjusting the stop position. The preassembled component unit is preferably adjusted or tested together with the spring.

A further advantage of the throttle device according to the invention over the conventional arrangement in which the stopper position is defined by the plastic deformation of the stopper is that the adjustment directly defines the stopper position and no special tool is required. And it can be easily adjusted if necessary.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The throttle system implemented according to the invention is used in all internal combustion engines, in which the output is controlled by means of a throttle mechanism which can be operated by an adjusting drive. It is like this. The diaphragm device is used in particular in motor vehicles. The diaphragm mechanism has, for example, a diaphragm flap or slider that is supported so as to be pivotable about a rotation axis. By means of throttle flaps or sliders, the free cross section in the throttle housing can be adjusted for controlling the internal combustion engine, for example intake air. The adjusting drive is, for example, an adjusting motor, in particular a stepper motor or a rotary drive. The adjusting drive may be an adjusting device which is configured in another way.

FIG. 1 shows the throttle casing 2, the throttle mechanism 4 and the adjusting drive 6 in detail. The diaphragm mechanism 4 has a shaft 8 and a diaphragm flap 10 in the illustrated embodiment. The shaft 8 is supported in the throttle casing 2 and is rotatable about a rotation axis 12. Aperture flap 1
0 is attached to the shaft 8. The pivoting of the shaft 8 or the throttle flap 10 opens more or less the air guide 14 extending through the throttle casing 2.

In the illustrated embodiment, the adjusting drive 6 is an electrical rotary drive. There is no transmission between the adjusting drive 6 and the shaft 8, so that the swiveling movement of the adjusting drive 6 is transmitted to the diaphragm flap 10 without a gear ratio. In the embodiment shown, the shaft 8 extends through the adjusting drive 6 and thus serves not only as a diaphragm flap axis, but also as a rotary axis for the adjusting drive 6. The shaft 8 may consist of several parts which interact with each other.

The adjusting drive 6 is provided with a flange surface 16, which is the flange surface 1 of the throttle casing 2.
It is in contact with 8. The flange surfaces 16 and 18 are the rotation axis 1
It extends perpendicular to 2. This is just one example. The flange surfaces 16, 18 may extend coaxially with the axis of rotation 12, for example conically.

The adjusting drive 6 is connected to the throttle housing 2 by means of at least one fixing screw 20. The fixing screw 20 is, for example, a commercially available screw, and the screw head 22
And a screw shaft 24. The adjusting drive device 6 is provided with a notch 26, and the throttle casing 2 is provided with a threaded portion 28.
Is provided.

The fixing screw 20 extends, for example, parallel to the rotation axis 12, penetrates the notch 26 with a screw shaft 24, and is screwed into the screw portion 28. Fixing screw 2
By tightening 0, the flange surface 16 of the adjustment drive device 6
Is pressed against the flange surface 18 of the throttle casing 2. A plate 30 is provided below the screw head 22 for good support. Plate 30, screw portion 28 and notch 2
6 are provided in the same number as the fixing screws 20.

A hole 31 is provided in the shaft 8 transverse to the axis of rotation 12, for example between the diaphragm flap 10 and the adjusting drive 6.
Is provided. A pin 32 extends through the hole 31. The pin 32 projects laterally beyond the shaft 8.
The diaphragm mechanism 4 is provided with a diaphragm mechanism stopper 34. In the illustrated embodiment, the end of the pin 32 forms a diaphragm mechanism stopper 34.

The adjusting drive 6 includes, for example, a diaphragm flap 1
The adjustment drive device stopper 36 is integrally formed by being assigned to 0. Depending on the position of the diaphragm mechanism 4, that is, depending on the position of the shaft 8, the diaphragm mechanism stopper 34 contacts the adjustment drive device stopper 36. The adjustment drive device stopper 36 serves as a corresponding stopper for the diaphragm mechanism stopper 34. Furthermore, a spring 40 is provided. The spring 40 engages the throttle casing 2 on the one hand and the pin 32 on the other hand and attempts to bring the throttle mechanism stop 34 into contact with the adjusting drive stop 36.

Further, a sensor 42 is provided. The sensor 42, which is configured, for example, as a potentiometer, has, for example, a plate 44 on which one or more resistance paths are arranged, and one slider arm 46 with one or more sliders. . The resistance path on the plate 44 is connected to an electronic device (not shown) via a cable 48 and possibly a plug connection. The slider arm 46 is rigidly connected to the shaft 8 of the diaphragm mechanism 4.
The plate 44 of the sensor 42 is fixed on the side of the adjusting drive 6 which is remote from the throttle housing 2. In response to the swiveling movement of the shaft 8, the slider of the slider arm 46 slides on the resistance path of the plate 44, so that depending on the position of the shaft 8 with respect to the adjusting drive 6, the sensor 42 detects the sensor via the cable 48. Send a signal to the electronic device. The sensor 42 is protected against external influences by the cover 50.

A turning portion 52 is provided in the throttle casing 2, and a protrusion 56 is provided on the side of the adjusting drive device 6 facing the throttle casing 2. The turning portion 52 and the protrusion 56 extend concentrically with respect to the rotation axis 12.
In the assembled state, the protrusion 56 substantially protrudes into the turning portion 52 with a little play. The pin 32 extends in the turning portion 52. An adjusting drive stop 36 extends into the turning part 52, for example starting from the projection 56.

When the fixing screw 20 is not tightened, the adjusting drive device 6 is rotated around the rotation axis 12 with respect to the diaphragm casing 2. When the adjusting drive 6 is rotated with respect to the diaphragm casing 2, the relative position of the diaphragm mechanism 4 with respect to the adjusting drive 6 does not change, since the stop 34 is held by the spring 40 on the adjusting drive stopper 36. Because. However, like the position of the adjusting drive 6 with respect to the diaphragm casing 2, the relative position of the diaphragm mechanism 4 with respect to the diaphragm casing 2 changes. The relative position of the throttle mechanism 4 with respect to the throttle casing 2 defines a free cross section in the air guide 14. Therefore, the free cross section of the air guide 14 is adjusted by the rotation of the adjusting drive 6. When no current is flowing through the adjusting drive device 6, the diaphragm mechanism stopper 34 is in contact with the adjusting drive device stopper 36 or the counter stopper, and the diaphragm mechanism 4 is at the predetermined stopper position. Such a stop position corresponds to the amount of air to be supplied to the internal combustion engine when the throttle mechanism 4 is in the stop position. This amount of air is specified so that the internal combustion engine operates in the idling mode. The throttling device may be configured such that when the throttling mechanism 4 is at the stopper position, an air amount that is significantly larger than the air amount required for idling operation flows through the air guide 14. This is important for emergency driving or emergency driving of motor vehicles in the event of a failure of the regulation drive. This means that, in response to actuation of the throttling mechanism 4 in the closing direction, for example, the throttling device exceeds the position of the minimum cross section and reopens the free cross section of the air guide 14 somewhat, and then moves the throttling mechanism 4 to the stop position. It is achieved by configuring to bring.

By tightening the fixing screw 20, the set stopper position is locked.

Energy is supplied to the adjusting drive 6 via a cable 58, which adjusts the shaft 8 of the diaphragm mechanism 4 against the force of the spring 40 in a controlled manner. When adjusting the diaphragm mechanism 4 against the force of the spring 40, the diaphragm mechanism stopper 34 separates from the adjustment drive device stopper 36. The relative position of the diaphragm mechanism 4 with respect to the adjustment drive device 6 is detected using the sensor 42. When adjusting the diaphragm mechanism 4 using the adjustment drive device 6, the sensor signal of the sensor 42 changes. When the fixing screw 20 is loosened and the adjustment drive 6 is swiveled around the rotation axis 12, that is, when the stopper position for the diaphragm mechanism 4 is adjusted, the sensor signal of the sensor 42 remains unchanged. That is, each sensor signal of the sensor 42 can be assigned to each predetermined diaphragm flap position, already before the diaphragm mechanism and the adjusting drive 6 are installed in the diaphragm casing 2. The sensor signal is independent of the subsequent adjustment of the stop position, which corresponds, for example, to the idling position of the internal combustion engine.

FIG. 2 shows the plane of the embodiment shown in FIG. The cutout 26 is embodied as a slot in the flange 59 of the adjusting drive 6 in the embodiment shown. The elongated hole extends in the circumferential direction around the rotation axis 12. Depending on the size of the slot, the entire adjustment drive 6 is swiveled around the axis of rotation 12.

FIG. 3 shows another advantageous embodiment of the diaphragm device. The illustrated embodiment has substantially the same structure except for the following differences. The individual configurations of the different embodiments can be combined with one another.

In FIG. 3, one illustrated (left) fixing screw 20 is screwed into a threaded portion 28 provided on the adjusting drive 6 and a notch 26 is provided in the throttle casing 2. The other (on the right) fixing screw 20 in FIG. 3 uses an additional nut to restrict the throttle casing 2 and the adjusting drive 6.
And are tightened. In this case, a notch 26 is provided in the adjusting drive 6 as well as in the throttle casing 2. Figure 3
The at least one notch through the threaded shaft of the fixing screw 20, shown on the right in FIG. 1, is largely defined so that the adjusting drive 6 can be swiveled in a desired manner with respect to the throttle housing 2.

In the embodiment shown in FIG. 3, one end of the spring 40 is supported not by the throttle housing 2 but by the adjusting drive 6. In both embodiments, the spring 40 acts in the direction to return the throttle mechanism 4.

In the exemplary embodiment, a pre-assembled component unit 60 including the adjustment drive 6, the spring 40 and the sensor 42.
Are formed. Such a pre-assembled component unit 60 is adjusted or inspected before it is combined with the throttle casing 2. In the pre-assembled component unit 60, for example, the adjusting drive 6 or the sensor 42 is tuned to precisely define at which position the shaft 8 is brought to the minimum idling position for the internal combustion engine. After combining the pre-assembled structural unit 60 and the diaphragm casing 2, the signal of the sensor 40 is not changed and the torque of the spring 40 is not changed when adjusting the diaphragm mechanism 4 by rotating the adjusting drive device 6. Is.

The adjusting drive 6 comprises, for example, an electric motor acting directly on the shaft 8, in particular a stepper motor. The adjusting drive 6 may for example be equipped with a transmission in addition to the electric motor.

In the embodiment shown, the shaft 8 has a double function and is used as the diaphragm flap shaft for the diaphragm flap 10 and as the rotary shaft for the adjusting drive 6. It is also possible to form the diaphragm flap shaft and the rotary shaft from two parts so that, for example, both shafts are connected only when the adjusting drive 6 is installed in the diaphragm casing 2. In this case, only the rotary shaft has the pre-assembly component 60.
And the diaphragm flap shaft is installed in the diaphragm casing 2 prior to the installation of the pre-assembled component unit 60.

The spring 40 may be composed of a single spring as shown in the drawing, or may be composed of a plurality of springs. 1 if it consists of multiple springs
The torque of the springs does not completely disappear when the two springs are broken.

The diaphragm mechanism stopper 34 and / or the adjustment drive device stopper 36 may, for example, be configured as elastic stoppers. As a result, the throttle mechanism 4 can be adjusted in both directions beyond the stopper position based on the torque reversal of the adjustment drive device 6. Pre-assembly component 60
May optionally receive spring 40.

The adjusting drive 6 can be connected to the throttle housing 2 by means of, for example, flanges or rivets, in which case the adjusting drive 6 and the throttle housing 2 are connected.
Only after adjusting the relative position with respect to the flange connection or rivet connection is finally performed.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of a diaphragm device.

FIG. 2 is a side view of the first embodiment.

FIG. 3 is a plan view of a second embodiment of the diaphragm device.

[Explanation of symbols]

2 diaphragm casing, 4 diaphragm mechanism, 6 adjusting drive device, 8 axis, 10 diaphragm flap,
12 axis of rotation, 14 air guide, 16, 18
Flange surface, 20 fixing screw, 22 screw head, 24 screw shaft, 26 notch, 2
8 screw part, 30 plate, 31 hole, 32
Pin, 34 Stopper mechanism stopper, 36 Adjustment drive device stopper, 40 Spring, 42 Sensor, 44 Plate, 46 Slider arm, 4
8 cables, 50 covers, 52 turning parts,
56 Projection

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Reiner Norgauer, Stuttgart, Federal Republic of Germany 1 Birkenwald Strasse 153 (72) Inventor Werner-Karl Marquardt, German Federal Republic of Germany Markglingen Primerweg 30

Claims (12)

[Claims] 1. A throttle device for controlling the output of an internal combustion engine, comprising a throttle casing, an operable throttle mechanism, an adjusting drive device, and a throttle mechanism stopper connected to the throttle mechanism. Is supported in the throttle casing and is adjustable by an adjusting drive so that the turning movement of the throttle mechanism is limited by the counter stopper, and the counter stopper can define the stopper position of the throttle mechanism. In the type in which the diaphragm mechanism occupies the stopper position by the contact between the diaphragm mechanism stopper and the counter stopper, the counter stopper (36) is connected to the adjustment drive device (6), and the diaphragm mechanism (4 (3) The stopper position of (3) can be changed by adjusting the adjusting drive device (6) with respect to the diaphragm casing (2). Place 2. The diaphragm device according to claim 1, further comprising at least one sensor (42) for detecting the position of the diaphragm mechanism (4), which is coupled to the adjusting drive. 3. Adjusting drive (6) and sensor (42).
3. A diaphragm device according to claim 2, wherein the diaphragm forms an adjustable pre-assembled component unit (60). 4. A spring (40) engaging a throttle mechanism (4).
A throttle device according to any one of the preceding claims, characterized in that a spring is provided, the spring acting to bring the throttle mechanism (4) to the stop position. 5. A throttle device according to claim 4, wherein the spring (40) engages the adjusting drive (6). 6. Adjusting drive (6), sensor (42),
A diaphragm device according to claim 2 or 5, wherein the spring and the spring (40) form an adjustable pre-assembled component unit (60). 7. A throttle mechanism (4) has a shaft (8) pivotally supported about a rotation axis (12),
The adjusting drive (6) is configured as a rotary drive and is connected to the throttle casing (2), and the adjustment of the stop position causes the swiveling movement of the adjusting drive (6) about the axis of rotation (12). The diaphragm device according to any one of claims 1 to 6, wherein the diaphragm device is configured to be performed by the following. 8. The adjusting drive (6) is connected to the throttle casing (2) by means of at least one fixing screw (20), the fixing screw (20) controlling the pivoting movement of the adjusting drive (6). 8. A throttle device according to claim 7, which extends through the enabling cutout (26). 9. A throttle device according to claim 8, wherein the notch (26) is a slot extending substantially in the swivel direction of the adjusting drive (6). 10. The stop position is used to define the amount of air to be supplied to the internal combustion engine, which air amount corresponds in particular to the amount of air required for idling or emergency operation of the internal combustion engine. The diaphragm device according to any one of 1 to 9. 11. The diaphragm device according to claim 1, wherein the diaphragm mechanism stopper (34) and the counter stopper (36) are arranged in the turning portion (52). 12. A diaphragm device according to claim 4, wherein the diaphragm mechanism stopper (34), the counter stopper (36) and the spring (40) are arranged in the turning part (52).