DE102005029262A1 - Load adjustment device for actuating unit, has reset and dry-running operation springs arranged concentric to rotation axis of regulating shaft having barrels concentric to axis, where one of barrel has diameter larger than other barrel - Google Patents

Abstract

The device has a reset spring (9) and a dry-running operation spring (15) arranged concentric to a rotation axis of a regulating shaft (3). The shaft is loaded with force by the springs between a full load position and a dry-running operation position and between a minimum load condition position and operation position. The shaft has barrels (7, 8) that are concentric to the axis. The barrel (7) has a diameter larger than the barrel (8). The regulating shaft (3) is loaded in a minimum load condition direction by the reset spring (9) that is designed as a torsion spring. The shaft is movably loaded from a position approaching the minimum load position to a dry-running operation position in a full load position direction by the dry-running operation spring (15).

Description

The The invention relates to a load adjusting device for a Performance of an internal combustion engine of a motor vehicle in particular designed as a throttle valve, on a control shaft in a housing arranged actuator, wherein the actuating shaft via a non-rotatably connected thereto Control part by means of a reversibly driven actuator between a minimum load position and a full load position about the axis of rotation of Adjusting shaft is pivotally driven, with a designed as a torsion spring Return spring by acted upon the control shaft in Minimallaststellungsrichtung is, and with a designed as a torsion spring emergency, by the adjusting shaft from one of the minimum load position near position be acted upon movable in Vollaststellungsrichtung up to a Notlaufstellung is, wherein the emergency spring and the return spring concentric to Rotary axis of the control shaft are arranged.

at Such known Lastverstelleinrichtungen is to minimize the fuel consumption, the minimum position designed so that the internal combustion engine still running equally smoothly when idling. The leads to, that it in the minimum load position is not possible a sufficient To generate torque to move the motor vehicle. This can However, if the motor vehicle from a danger area must be moved out and however, the load adjustment device as a result of a failure of the control electronics or the actuator is no longer adjusted by pressing the accelerator pedal can be. For this reason, in known Lastverstelleinrichtungen in addition to Return spring a sprung spring provided, which ensures that the actuator in case of failure the control electronics or the actuator from the minimum load position inevitably moved to the emergency position, in which the internal combustion engine sufficient great Torque generated to the motor vehicle at low speed to be able to move.

there is the control part of the return spring up in the minimum load position kraftbeaufschlagbar and will in case of failure the control electronics or the actuator from the emergency spring against the force of the return spring moved to the emergency position.

This requires a relatively strong sizing of return spring and emergency spring and the acted upon by these springs components.

task The invention is therefore a load adjustment of the above mentioned type, the use of small-sized springs as well as a space and weight-saving small dimensions allows the acted upon by the springs components.

These Task is inventively characterized solved, that this Control part of the return spring between the full load position and the emergency position and the emergency running spring between the minimum load position and the emergency position kraftbeaufschlagt is.

This always exercises only one of the springs exerts a torque on the actuator. There is thus no operating condition in which one of the springs against the force the other pen has to work and should therefore be trained accordingly strong.

The Lower dimensioning of the springs also allows a lower Sizing the acted upon by the springs components, what to a reduction of the required installation space and weight the load adjustment leads.

In advantageous simple training, a first end of the return spring at a first housing fixed Stop and a first end of the emergency spring on a first stellteilfesten Stops be fixed, with a second end of the return spring and a second end of the emergency spring at a second stellteilfesten Stop supported and in the emergency position of the control part to a movement to Minimum load limit limiting second housing fixed stop in plant are, with the second ends of return spring and emergency spring from the second stop fixed stop from the emergency position in the direction of the full load position are entrained.

The Control unit can to reduce the required space a first to the axis of rotation concentric drum, by the return spring is enclosed.

This also applies if the actuator is a second concentric to the axis of rotation Drum which is enclosed by the emergency spring.

A particularly compact and only small space requiring training is achieved by the the first drum has a larger diameter as the second drum and with a radial distance the second Drum surrounds.

To the Drive the actuator has this one preferably to the axis of rotation concentric tooth segment, over that the control part of the actuator is pivotally driven.

It can be used to reduce the speed the actuating drive, the control part via a transmission of the actuator to be driven pivotally.

Of the Stelltrieb can be a reversible electric motor, in particular DC motor be.

are the return spring and / or the emergency spring cylindrical helical torsion springs, so is the required space especially low.

It but it is also possible that the Return spring and / or the emergency spring coil springs are.

One embodiment The invention is illustrated in the drawing and will be described below described in more detail. Show it

1 a perspective throttle side view of a section of a load adjustment

2 a throttle flap side view of the section of the load adjusting device according to 1

3 a perspective outside view of a section of the load adjustment device according to 1 ,

The load adjusting device shown in the figures has a housing 1 a throttle body with a continuous throttle opening 2 on, over which an internal combustion engine, not shown, fresh gas can be fed.

For adjusting the volume of the fresh gas to be supplied, the throttle opening is perpendicular to a right angle 2 towering and both sides in the case 1 rotatably mounted control shaft 3 an actuator forming throttle 4 arranged. A rotation of the control shaft 3 at the same time a pivoting of the on the control shaft causes about its axis of rotation 3 arranged throttle 4 , whereby the flow area of the throttle opening 2 is increased or decreased. By means of an enlargement or reduction of the flow cross section of the throttle opening 2 through the throttle 4 Adjustment of the flow rate of the fresh gas through the throttle opening 2 of the throttle body.

On one in the housing 1 projecting end of the control shaft 3 is rotatably disposed an actuating part, which is a concentric with the axis of rotation toothed segment 5 has, with which an unillustrated gear meshes of a transmission, which in turn from one in a trough 6 of the housing 1 can be driven rotatably drivable, not shown DC motor.

Of the DC motor is from a control electronics, also not shown driven.

The actuator also has a first, concentric with the axis of rotation drum 7 larger diameter, with a radial distance a second, concentric to the axis of rotation drum 8th encloses smaller diameter of the actuator.

The first drum 7 is of a trained as a cylindrical helical torsion spring prestressed return spring 9 enclosed, their first end 10 bent radially outward and on a first housing fixed stop in the circumferential direction of the return spring 9 is supported.

The second end 11 the return spring 9 is also bent radially outward and against the support direction at the stop 11 in the circumferential direction of a stop 13 supported the control part.

The radially outer part of the second end 12 the return spring 9 protrudes radially over the stop 13 out into the area of a second housing fixed stop 14 at the end 12 against the supporting direction of the first end 10 the return spring 9 at the stop 11 is supportable.

In the annular gap between the first drum 7 and the second drum 8th is designed as a cylindrical helical torsion spring, preloaded emergency spring 15 the second drum 8th arranged enclosing.

A first end 17 the emergency stop spring 15 is bent radially inward and on a stellteilfesten stop 16 firmly arranged.

The second end 18 the emergency stop spring 15 is bent radially outward and adjacent to the second end of the return spring 9 against the supporting direction of the first end 17 at the stop 16 in the circumferential direction of the emergency spring 15 at the stop 13 supported the control part.

It is understood that instead of for the ends 11 and 18 of return spring 9 and emergency spring 15 common stop 13 also two separate stops could be present.

Also the second end 18 the emergency stop spring 15 protrudes radially over the stop 13 out into the area of the second housing fixed stop 14 at the end 18 against the supporting direction of the first end 17 the emergency stop spring 15 is supportable.

Again, the attack could be 14 divided by two separate stops for the two spring ends 12 and 18 be formed.

Are the second end 12 the return spring 9 and the second end 18 the emergency stop spring 15 in contact with the housing-fixed stop 14 , so is the throttle 4 in her the flow cross-section slightly opening emergency position.

Should the throttle 2 be moved to its minimum position, this is done by a corresponding drive of the DC motor via the gear and the toothed segment 5 , This is the control part and with him the end of the 12 and 18 of return spring 9 and emergency spring 15 lifting stop 13 pivoted. Although the first end 17 the emergency stop spring 15 is moved with the control part, but the second end 18 the emergency stop spring 15 in the installation position of the housing fixed stop 14 remains, it comes to a tensioning of the emergency spring 15 ,

Should it then be a failure of the control electronics 2 or the DC motor moves the emergency spring 15 the control part and with this the throttle 4 back to the emergency position.

Is done by the DC motor, a drive of the control part and thus also the throttle 4 beyond the emergency position towards the full-load position, become the second end 12 the return spring 9 and the second end 18 the emergency stop spring 15 from the pivoted with the control part stop 13 taken along and thereby the return spring 9 preloaded while the emergency stop spring 15 receives no voltage increase, since the other end also pivots.

Should it now come to a failure of the control electronics or the DC motor, moves the return spring 9 the control part and with this the throttle 4 back to the emergency position.

1

casing

2

throttle opening

3

actuating shaft

4

throttle

5

toothed segment

6

trough

7

first drum

8th

second drum

9

Return spring

10

first End return spring

11

first fixed to the housing attack

12

second End return spring

13

attack

14

second fixed to the housing attack

15

emergency operation

16

Vice part fixed attack

17

first End emergency spring

18

second End emergency spring

Claims (10)

Lastingstelleinrichtung for determining the performance of an internal combustion engine of a motor vehicle, in particular designed as a throttle, arranged on a control shaft in a housing actuator, wherein the actuating shaft via a non-rotatably connected thereto actuator by means of a reversibly driven actuator drive between a minimum load position and a full load position about the axis of rotation The actuating shaft is pivotally driven, with a trained as a torsion spring return spring through which the control shaft is acted upon in Minimalalleststellungsrichtung, and formed with a run-flat emergency spring, by which the actuating shaft from a minimum position close position in Vollaststellungsrichtung can be moved to an emergency position movable, wherein the torsion spring and the return spring are arranged concentrically to the axis of rotation of the control shaft, characterized in that the actuating part of the return spring ( 9 ) between the full load position and the emergency position and the emergency running spring ( 15 ) is subjected to a force between the minimum load position and the emergency position. Load adjusting device according to claim 1, characterized in that a first end ( 10 ) of the return spring ( 9 ) on a first housing-fixed stop ( 11 ) and a first end ( 17 ) of the emergency running spring ( 15 ) at a first station fixed stop ( 16 ) are fixed, that a second end ( 12 ) of the return spring ( 9 ) and a second end ( 18 ) of the emergency running spring ( 15 ) at a second fixed pitch stop ( 13 ) and in the emergency position of the actuating part on a second housing fixed stop limiting a movement to the minimum load position ( 14 ) are in abutment, the second ends ( 12 . 18 ) of default ( 9 ) and emergency spring ( 15 ) from the second digit fixed stop ( 13 ) From the emergency position towards the full load position are mitnehmbar. Load adjusting device according to one of the preceding claims, characterized in that the actuating part has a first drum concentric with the axis of rotation ( 7 ) provided by the return spring ( 9 ) is enclosed. Load adjusting device according to one of the preceding claims, characterized in that the actuating part has a second concentric to the axis of rotation Drum ( 8th ) of the emergency running spring ( 15 ) is enclosed. Load adjusting device according to claims 3 and 4, characterized in that the first drum ( 7 ) has a larger diameter than the second drum ( 8th ) and at a radial distance the second drum ( 8th ) encloses. Load adjusting device according to one of the preceding claims, characterized in that the actuating part has a tooth segment concentric with the axis of rotation ( 5 ), via which the control part of the actuator is pivotally driven. Load adjustment device according to one of the preceding Claims, characterized in that the Control part over a transmission of the actuator is pivotally driven. Load adjustment device according to one of the preceding Claims, characterized in that the Stelltrieb a reversible electric motor, in particular DC motor is. Load adjusting device according to one of the preceding claims, characterized in that the return spring ( 9 ) and / or the emergency spring ( 15 ) are cylindrical helical torsion springs. Load adjusting device according to one of claims 1 to 8, characterized in that the return spring and / or the emergency spring coil springs are.