EP3818425A1

EP3818425A1 - Rotary actuator

Info

Publication number: EP3818425A1
Application number: EP19737022.4A
Authority: EP
Inventors: Joachim Spratte; Mario Fischer; Bernard LAGEMANN
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 2018-07-02
Filing date: 2019-06-28
Publication date: 2021-05-12
Also published as: CN112384875A; US20210123524A1; US11530744B2; CN112384875B; WO2020007734A1; DE102018210837A1

Abstract

The invention relates to a rotary actuator for controlling a plurality of operating functions of a technical system. The rotary actuator comprises a rotary knob (1) which can be rotated about a rotary axis (2) into one of several control positions corresponding to the operating functions and each control position can be detected by a first sensor unit. A corresponding control position signal can be fed to a control unit for controlling the technical system and the controlled operating function can be carried out. The rotary actuator also comprises a second sensor unit which can detect a switch-off signal of the technical system and from which said signal can be fed to the control unit, by means of which the technical system can be adjusted into a basic function of the operating positions. The rotary actuator also comprises one or more sliding tracks (4, 4') which are arranged concentrically on the rotary knob (1), rotate radially by an angle of less than 360°, are delimited by stops (6, 6', 6'', 6'''), and into which stationary stop elements for limiting the angle of rotation of the rotary knob (1) can be moved by an actuating device, wherein each controlled operating function can be displayed using a display unit (24). The stop elements can be moved from an external engagement position into the sliding tracks (4, 41) counter to a spring force of cams (10) of a cam disc (7), wherein the cam disc (7) can be rotatably driven by an electric motor and each rotational position of the cam disc (7) can be detected by a third sensor unit from which a corresponding rotational position signal can be fed to the control unit.

Description

turntable

The invention relates to a rotary actuator for controlling several operating functions of a technical system, with a rotary knob which can be rotated about an axis of rotation into one of several operating positions corresponding to the operating functions and the respective positioning position can be detected by a first sensor unit, with a corresponding positioning position signal from a control unit for controlling the technical system and the controlled operating function can be carried out, with a second sensor unit, from which a switch-off signal of the technical system can be detected and supplied to the control unit, through which the technical system can be adjusted into a basic function of the operating positions, with one or more arranged centrally on the rotary knob, at an angle less than 360 ° radially around the current, limited by stops slotted tracks, in the stationary stop elements to limit the angle of rotation of the rotary knob in a direction are available, the respective operating function being indicated by a display unit.

Such a known rotary actuator is used for manual actuation of the switching functions forming the operating functions "P" for parking, "R" for reverse gear, "N" for neutral and "D" for driving an automatic transmission of motor vehicles. The switching signal is triggered by actuating the brake of the motor vehicle or by a door contact when leaving the motor vehicle or by an ignition switch when the ignition of the motor vehicle is switched off. The automatic transmission is shifted from one of the inserted gear steps "R", or "D" is switched to the gear step "Park", but the display shows the gear lever previously engaged.

The control electronics now also switch the display to switching position "P", whereby the plunger, which can be brought into contact with the slide tracks and which can come into contact with the stops, prevents the locking disk and the rotary knob from rotating. If the motor vehicle continues to drive, the desired gear stage can then be turned by normally turning the the unlocked rotary knob can be set again, the display then also showing the correct switching level.

The actuation of the plunger by electromagnets requires a number of electromagnets corresponding to the number of switching stages, which is very complex. In addition, two electromagnets are usually energized during operation, which causes high power consumption and considerable self-heating.

The object of the invention is therefore to provide a rotary actuator of the type mentioned which, with a simple construction, requires reduced power consumption and causes only a small amount of self-heating.

This object is achieved in that the stop elements against a spring force of cams of a cam plate can be moved from an out of reach position into the slide tracks, the cam plate being rotatably driven by an electric motor and the respective rotational position of the cam plate being detectable by a third sensor unit, one of which Corresponding rotational position signal of the control unit can be fed.

With this design, only one element for adjusting the stop elements, which is driven by a single drive, namely the electric motor, is required with the cam disk. Since the electric motor is only energized for the adjustment process, the power consumption and self-heating are low.

So that the rotary knob correctly assumes its set positions and is held in these, the rotary knob on a radially circumferential path can have a plurality of axially directed locking recesses corresponding to the set positions, which are evenly distributed over 360 ° around the circumference, in each of which one or more axially displaceable bar guided and acted upon by a spring force in the locking direction locking elements which can be locked by turning the rotary knob into the adjacent Rastver recesses. The stop elements and / or the locking elements can be movable radially to the axis of rotation. However, it leads to a compact design if the elements and / or the locking elements are movable axially to the axis of rotation.

By means of the cams, tappets can be moved from the disengaged position from the scenes into the scenery paths.

Are the plunger evenly distributed on the circumference via spring arms connected to a radially inner retaining ring which is fixedly arranged on a housing part of the rotary actuator, so that all the tappets, Fe derarme and the retaining ring can be designed as a component to simplify assembly and reduce components.

In this case, the plungers can be spring-loaded in contact with the cam disc by prestressing the spring arms.

It is also easier to assemble, saves installation space and reduces the number of components if the link tracks and the radially circumferential track are arranged concentrically on the locking disk.

An embodiment of the invention is shown in the drawing and is described in more detail below. Show it:

Figure 1 is a side view of a turntable

Figure 2 shows the turntable of Figure 1 in a perspective view

3 shows a perspective view of an axis with gear of the rotary actuator according to FIG. 1

Figure 4 is a perspective view of a locking disk of the turntable according to

Figure 1 FIG. 5 shows a perspective view of an assembly consisting of plungers, spring arms and retaining ring of the turntable according to FIG. 1

FIG. 6 shows a perspective view of a structural unit consisting of a cam disk and a gear stage of the rotary actuator according to FIG. 1

Figure 7 is a perspective view of a knob and a display of the

Rotary actuator according to Figure 1.

The rotary actuator shown in the figures for controlling a plurality of operating functions of a technical system has a rotary knob 1 which can be rotated about an axis of rotation 2 into one of a plurality of adjusting positions corresponding to the operating functions.

The rotary control shown serves for manual actuation of the shift stages "P" for parking, "R" for reverse gear, "N" for neutral and "D" for drive of an automatic transmission of motor vehicles.

On the underside of the rotary knob 1, a locking disk 3 is concentrically arranged, which has two radially circumferential link tracks 4 and 4 'on the same diameter. The two slide tracks 4 and 4 'are separated at their ends by protruding stop cams 5, 5', which form 4 stops 6 and 6 '' for the slide track and 4 'stops 6' and 6 '' for the slide track.

Concentric to the locking disk 3, a cam disk 7 is arranged at an axial distance, which is rotatably driven by an electric motor 9 via a gear stage 8.

The cam disk 7 has a plurality of cams 10 protruding toward the locking disk 3 on a slide track 4, 4 'axially opposite lying radially circumferential track. By means of the cams 10, plungers 11 forming stop elements can be moved axially out of a disengaged position from the slide tracks 4, 4 'into the slide tracks 4, 4'.

The eight plungers 1 1 are evenly distributed on the circumference via spring arms 12 with egg nem radially inner retaining ring 13 which is seteil fixed to a housing, not shown.

The prestressing of the spring arms 12 causes the tappets 11 to be spring-loaded in contact with the cam plate 7.

Are by the cam 10 plunger 1 1 in one of the slide tracks 4, 4 'moved, the locking disc 3 between the stops of the plunger 1 1 on the two strikes 6 and 6' 'or 6' and 6 '' 'of the slide track 4th or 4 'rotatable, in which the plunger 11 is moved.

So that the rotary knob 1 is correctly positioned in an assumed position, the locking disc 3 radially within the guide tracks 4, 4 'has a con centric radial circumferential track 14 with a number of axially directed locking recesses 15 corresponding to the setting positions, which over 360 ° evenly around are distributed.

The track 14 axially opposite are axially guided on a housing part, not shown, in guide bores 16, which form latching elements and are acted upon by helical compression springs 17 in the latching direction against the track 14, so that the pins 16 snap into the latching depressions 15. Upon rotation of the rotary knob 1 snap under compression of the helical compression springs 17, the bolts 16 from the locking recesses 15 and engage in the adjacent locking recesses.

A further gearwheel 18 is rotatably driven by the gear stage 8 and is arranged on an axis 19 which is fixed to the gearwheel 18. A diametrical permanent magnet 20 is arranged on one end of the axis 19, in the magnetic field of which a rotational position sensor element 21 is arranged on a fixed circuit board 21. By the rotational position sensor element 21, the respective rotational position of the axis 19 and thus indirectly also the cam disk 7 can be detected and a corresponding first rotational position signal of the cam disk 7 can be generated and supplied to control electronics (not shown).

Furthermore, a Hall sensor 22 is arranged on the printed circuit board 1 and a permanent magnet 23 is arranged on the locking disk 3. Corresponding to the position of the permanent magnet 23 relative to the Hall sensor 22, a second rotational position signal is generated by the latter and sent to the control electronics.

On a housing of the turntable, not shown, in addition to the rotary knob 1, a display 24 for the gear stages with the display elements “P” for parking, “R” for reverse gear, “N” for neutral and “D” for drive of an automatic transmission is arranged. In this case, the display element is activated by the control electronics, the switching stage of which is currently set.

Furthermore, the control electronics receives a brake signal from a brake, not shown, of the motor vehicle when the brake is actuated and, for example, from a door contact when leaving the motor vehicle or from an ignition switch when switching off the ignition of the motor vehicle, a switch-off signal.

Reference sign rotary knob

axis of rotation

locking disc

link path

‘Scenic track

stop cams

'Stop cam

attack

' Attack

'' Attack

''' Attack

cam

gear stage

electric motor

cam

tappet

spring arms

retaining ring

train

latching depression

bolt

Helical compression spring

gear

axis

Diametrically permanent magnet

1 pcb

Hall sensor

permanent magnet

display

Claims

claims

1. Rotary actuator for controlling several operating functions of a technical system, with a rotary knob (1) which can be rotated about an axis of rotation (2) into one of several operating positions corresponding to the operating functions and the respective positioning position can be detected by a first sensor unit, a corresponding one Position signal of a control unit for activating the technical system can be supplied and the activated operating function can be carried out, with a second sensor unit from which a switch-off signal of the technical system can be detected and supplied to the control unit, by means of which the technical system can be adjusted to a basic function of the operating positions, with one or more concentric on the rotary knob (1) on ordered, by an angle less than 360 ° radially circumferential, by stops (6, 6 ', 6' ', 6' '') limited backdrop tracks (4, 4 '), in the stationary stop elements from an actuating device to limit the angle of rotation of the knob

(1) can be moved in, the respective operating function being indicated by a display unit (24), characterized in that the stop elements counter to a spring force of cams (10) of a cam disk (7) from a disengaged position in the link tracks (4, 4 ') can be moved into it, the cam disc (7) being rotatably driven by an electric motor and the respective rotational position of the cam disc (7) being detectable by a third sensor unit, from which a corresponding rotational position signal can be fed to the control unit.

2. Rotary actuator according to claim 1, characterized in that the rotary knob (1) on a radially circumferential path (14) has a corresponding number of positions corresponding axially directed locking recesses (15), which are distributed over 360 ° evenly on the circumference, in the One or more latching elements, each guided axially displaceably and acted upon by a spring force in the latching direction, engage, which can be latched into the respectively adjacent latching depressions (15) by turning the rotary knob (1).

3. Rotary actuator according to one of the preceding claims, characterized in that the stop elements and / or the latching elements can be moved axially to the axis of rotation (2).

4. Rotary actuator according to one of the preceding claims, characterized in that the cams (10) plunger (1 1) from a disengaged position of the Ku lissenbahnen in the link tracks (4, 4 ') can be moved.

5. Rotary actuator according to claim 4, characterized in that the plungers (1 1) are evenly distributed on the circumference via spring arms (12) with a radially inner retaining ring (13) which is fixedly arranged on a housing part of the rotary actuator.

6. Rotary actuator according to one of claims 4 and 5, characterized in that the tappets (1 1) in contact with the cam disc (7) are spring-loaded by prestressing the spring arms (12).

7. Rotary actuator according to one of the preceding claims, characterized in that the link tracks (4, 4 ') and the radially circumferential track (14) are arranged concentrically to one another on the locking disk (3).