DE102010053505A1 - Device for shift by wire actuation of parking lock integrated in speed change gear of motor car, has ratchet pawl of parking lock transferred from parking lock position into another parking lock position in control position - Google Patents

Abstract

The device has a handle (7) bringing a control element (24) e.g. cam part, from a control position (Paus) into another control position (Pein) in an actuation direction (X) i.e. tension direction, in an emergency operation. The control element is brought into a third control position (Pausn) from the latter control position by an additional distance (delta s) by maintaining the actuation direction. A ratchet pawl (26) of a parking lock is transferred from a parking lock position into another parking lock position in the third control position.

Description

The present invention relates to a device for actuating a parking lock of a speed change gearbox of motor vehicles according to the preamble of claim 1.

From the DE 100 01 446 A1 a generic device is known in which the effected via a cable emergency operation is combined with an electromechanical adjustment. In this case, the soul of the cable is used with a manually adjustable handle as an emergency operation, while the adjusting device acts on a connector of the cable housing, by means of the effective cable length corresponding to setting the positions "parking lock designed" or "parking brake engaged" indirectly via a lever on the transmission internal cam or pawl part is transferable.

In normal operation, the actuation of the parking brake via a change in length of the cable housing of the cable with the help of the electromechanical adjustment takes place. This has two operating positions, namely "parking brake designed" and "parking brake engaged", which are preferably monitored by means of an integrated in the electric motor of the adjusting and redundant position detection. The cable core of the cable is, however, in emergency mode, that is, when no electrical power is available, used for manual operation of the parking brake using the handle of the emergency operation.

The from the DE 100 01 446 A1 known parking brake operation has the disadvantage that each for the on and laying out the parking lock each electrical energy is required. In addition, the emergency operation used in the event of a power failure is effective only in one direction. This means that in case of power failure, depending on the actuation concept, the parking brake can either be designed only or only inserted.

The object of the invention is based on the generic device further develop this so that greater structural freedom in emergency operation are given and that reliable both an insertion and a design of the parking brake is always executable on the emergency operation.

The solution to this problem is achieved with the features of claim 1. Advantageous and particularly useful developments of the invention are set forth in the dependent claims.

The invention relates to a parking brake operation, wherein a cooperating with a Parksperrenrad locking element of the parking brake between a first parking lock position in which the locking element of the parking lock is designed, for example, and a second parking lock position in which the locking element of the parking lock, for example is adjustable with the aid of the electromechanical adjusting unit. With this adjustment unit, a control element of the parking brake can be adjusted within a setting range between a first control position in which the blocking element of the parking brake is in the first parking lock position and a second control position in which the blocking element of the parking brake is in the second parking lock position , Alternatively, in the event of a power failure, an emergency operation may take place in which the control element can not be brought into the second control position from the first control position in an electromechanical manner, but manually in a predetermined actuating direction, in particular a pulling direction. According to the characterizing part of claim 1, the emergency operation is extended in comparison to the prior art. Consequently, the control range of the control element is extended by an additional travel in emergency mode. By means of the additional travel, the control while maintaining the operating direction of the second control position can be brought into a third control position. In the third control position, the blocking element of the parking brake is transferred again from the second parking lock position in the first parking lock position.

According to the invention, therefore, depending on the actuation concept, in case of power failure, the parking lock manually both inserted and designed. In contrast, in contrast, in the prior art, the parking brake, depending on the actuation concept, either only designed or only inserted.

The control can be an adjustable drawn part or cam part and actuate, for example, a spring-biased pawl. This can be brought into engagement with the parking lock gear in the output of the transmission. The drawn part may have a special cam contour, which changes the parking lock positions of the pawl according to the invention in a drawing part adjustment.

Preferably, the cam member may have two oppositely directed, inclined ramps and be adjustable via the emergency operation, that the pawl in only one operating direction, starting from a laid position via an oblique ramp in an inserted position of the parking brake and in the inserted position on the other beveled Ramp is convertible into a laid-out position. The cam member (this may be, for example, an axially movable draw key) thus has two inclined ramps and is on the regular adjustment positions "from - a" in another, through the second inclined ramp defined position adjustable over which it can be transferred depending on the transmission design on the emergency operation from the loading position to the deployment position. The gearbox complexity is relatively low.

The two inclined ramps can be easily arranged on both sides of a central locking portion of the cam part in terms of manufacturing technology.

The cable of the emergency operation can in accordance with the above-mentioned DE 100 01 446 A1 the Applicant be combined with an arranged on the cable housing, electromechanical adjustment, the cam accordingly controlled the cam or indirectly via an inclined ramp in a "parking lock on" - or "parking lock off" position adjusted, the manually via an actuator adjustable, the adjusting superimposed soul of the cable via the first or the second inclined ramp the cam part transferred to the other position. The well-known from the above publication parking brake is thus extended to the effect that over the soul of the cable emergency operation, the parking brake is both interpretable as well as inserted, so their regular off / on function can take over in an emergency by manual operation.

Embodiments of the invention are explained in more detail below with reference to the accompanying schematic drawing.

Show it:

1 a device for "shift by wire" operation of an integrated in a change gearbox for motor vehicles parking brake, with an electromechanical adjustment and caused by a cable emergency operation, by means of a two inclined ramps exhibiting cam portion of the parking lock operation, the parking brake is inserted or interpreted; and

2 to 4 the cam part together with the pawl in different switching positions in normal and in the Nötbetrieb.

In the 1 a device for actuating a parking brake in the shift-by-wire system for a speed change gear or an automatic transmission in a motor vehicle is shown as far as is necessary for the understanding of the present invention.

The device has a cable 1 with a cable casing 2 and a soul 3 on, with the fittings 4 . 5 for the shell 2 on the one hand in the interior of the motor vehicle (for example on the instrument panel) and on the other hand in the vicinity of the only indicated change gear 6 attached directly to the gearbox.

The soul 3 of the cable 1 on the one hand carries a handle 7 for manual emergency operation of the parking brake and on the other hand a rigid guide pin 8th that has a joint 9 with one in the transmission 6 swiveling lever 10 connected is.

The guide pin 8th is in a likewise rigid hinge sleeve 11 slidably guided, via a ball and socket joint 12 with a control box 13 the electromechanical adjusting device 14 connected is.

The adjusting device 14 has an electric motor 15 on, whose output shaft 16 a gear 17 wearing that with a gear 18 on an adjusting nut 19 combs. The adjusting nut 19 is in the connector 5 guided axially immovable and acts via an internal thread with an external thread on the actuator box 13 drove together. The control box 13 is in the fitting 5 axially displaceable, but non-rotatable via an axial tongue and groove connection in the connection piece 5 held.

A control of the electric motor 15 via an unillustrated, electronic control unit in one or the other direction causes via the gears 17 . 18 and the threaded connection between the adjusting nut 19 and the Stellbüchse 13 a length adjustment of the cable 1 or a corresponding adjustment of the adjusting sleeve 13 attached shell 2 relative to the fitting 5 ,

The electric motor 15 (or the control box 13 ) has a position detection connected to the electronic control unit, by means of which the parking lock positions "P in" or "P out" on the transmission-side shift lever 10 are detectable. These positions are in gear 6 by means of an internal detent 20 specified.

That with the soul 3 of the cable 1 connected handle 7 for manual emergency operation of the parking brake is in the drawn basic position (inserted position) in a cover 21 held positively. The cover 21 can if necessary from the connector 4 be removed.

The shifter 10 in the 1 is designed as a two-armed lever and at its other end via a hinge connection 22 with an axial in the transmission 6 slidably guided control rod 23 connected. This carries an axially displaceable cam member, which serves as a control for controlling a pawl described later 26 serves and this in turn by means of a spring 25 is held in a stop position.

The cam part 24 has a middle barrier section 24a and two adjacent, wedge-shaped tapered or inclined in the direction of displacement ramps 24b . 24c on, which pass into sections (not numbered) of smaller cross-section.

The cam part 24 works with one in the 1 only indicated, pivoting in the transmission 6 mounted pawl 26 functionally in such a way that in a conventional manner with with the locking portion 24a larger cross-section cooperating pawl 26 this with a in the output of the gearbox 6 rotatably mounted Parksperrenrad 28 (please refer 2 to 4 ) engages and thus the parking brake is activated or engaged.

In the sections of the cam part 24 on both sides of the oblique frame 24b . 24c smaller cross-section is that according to the 2 to 4 via a return spring 29 resiliently biased pawl 26 out of engagement with the parking lock gear 28 and accordingly disabled the parking brake or designed.

A regular parking lock operation where the pawl 26 in the first or second parking lock position I . II ( 2 and 3 ) Can be brought, takes place in normal operation via the adjusting device 14 in accordance with, for example, the setting of a selector lever of the transmission to the position P or a comparable switch, an ignition switch and possibly in accordance with other safety-related parameters, such as vehicle speed, etc ..

In the, in the 1 indicated by dotted line position P _from the operating lever 10 is the pawl 26 the parking lock in the corresponding, in the 2 Parking lock position shown in detail I , That is, according to the 2 the cam part 24 in a control position "P _off " is located, in which the pawl 26 in one, the sloping ramp 24b adjacent position of smaller cross-section of the cam member 24 and thus no longer with the parking lock gear 28 of the transmission 6 is engaged.

For example, if the selector lever starting from in the 2 disabled parking brake shown switched to the position P and the vehicle is at a standstill, it is controlled by driving the electric motor 15 and by appropriate length adjustment of the cable 1 the operating lever 10 within the travel s in an actuating direction x of the in the 1 indicated by dot-dash line position "P _off " in the in the 1 adjusted position shown "P _a". In this process, two cases must be distinguished: according to the first case, the pawl hits 26 exactly in a tooth gap of the parking lock gear 28 , According to the second case is the pawl 26 in a "tooth-on-tooth" position with the parking lock wheel 28 , Both cases are described below.

In the first case, the cam part 24 by means of the spring 25 starting from the first control position P _of ( 2 ) via the travel s immediately in the second control position Pein according to the 3 shifted to the right. The spring 25 is not biased here, since the spring 25 and the return spring 29 are tuned so that the effect of the return spring 29 on the pawl 26 is less than the actuating force required to the cam member 24 from the control position P _of ( 2 To move) to the right into the control position P _a.

This is the pawl 26 over the sloping ramp 24b in the second parking brake position II method. In this parking lock position II is the lock section 24a according to the 3 in a vertical escape with the pawl 26 , Should the pawl when inserting the parking brake 26 coincidentally lie tooth on tooth with the ratchet wheel, so in a known manner the spring 25 compressed until this inner block state of the pawl 26 has lifted. Then leads the spring 25 the cam part 24 to.

When laying out the parking lock with the electric motor 15 in the position "P _off ", the process is reversed, without the participation of the spring 25 ,

If the described regular electric parking lock operation is not available due to a system error or any other electrical or mechanical failure, then the emergency operation by means of the handle 7 and the cable soul 3 nevertheless the parking lock be inserted or interpreted. This is first in the 1 shown cover 21 to remove.

The pawl 26 the parking brake can be engaged or designed in case of failure of the regular parking lock operation depending on the situation.

Is the pawl located 26 in case of failure of the regular parking lock operation in the parking lock position I ( 2 ), so by pulling out the handle 7 the emergency operation in the in the 1 shown latched position 7 ' the shifter 10 starting from the first control position P _off via the travel s in the second control position P are adjusted. The cam part 24 and the pawl 26 are doing so after current position between the ratchet tooth and the gap of Parking lock gear 28 moved exactly as described above in terms of electrical operation.

Is the pawl 26 the parking brake engaged in case of failure of the regular parking lock operation, so can by pulling out the handle 7 from the in the 1 shown basic position in the dashed line indicated position 7 '' the operating lever 10 of the transmission 6 be pivoted in an additional third operating position, in the 1 with a _dash-dotted line and with the reference _symbol "P _ausN " ( 4 ) is indicated. For this purpose, the operating lever 10 and the cam member operatively connected thereto 24 in emergency operation, an additional travel Δs provided, whereby the cam member 24 while maintaining the actuation _direction x until the third control position P out of _{N according} to the invention is adjustable. In the 4 is the cam part 24 shown in this third control position P out of _N , in which the pawl 26 the parking lock automatically from the second parking lock position II back in the first parking lock position I is transferred, in which the pawl 26 is designed. When adjusting the cam part 24 (from _the second control position P 3 ) in the third control position P out of _N first becomes the spring 25 compressed to the stop and then the cam part 24 postponed. This is the cam part 24 starting from the 3 shifted by the additional travel .DELTA.s to the right and at the same time the pawl 26 over the second left-sided ramp 24c transferred to the section of smaller cross-section, in which the pawl 26 the parking lock is designed.

In accordance with the 3 still inserted pawl 26 the parking brake can - for example when parking in a parking space with a slope - additional support forces F _s ( 3 ) over the parking lock wheel 28 on the pawl 26 act and this against the lock section 24a of the cam part 24 to press. This means that starting from the 3 initially at still from the pawl 26 still held cam part 24 the spring 25 is biased until the annular collar 31 the operating rod 23 with the cam part 24 comes to a stop. Only then is by a further pulling out of the operating handle 7 in his with 7 '' designated position, the cam member in the control position P out of _N shifted.

The laying process described above takes place - in comparison to the insertion process - with an approximately twice as large stroke of the handle 7 ,

It should be emphasized that the in the 4 shown third control position P out _{N of} the cam member 24 exclusively mechanically with the emergency operation 7 can be made, but not by means of the regular parking lock operation.

When restoring the regular parking lock operation via the adjusting device 14 In any case, make sure that the handle 7 the emergency operation back in the normal position and the cover 21 is mounted.

In the 1 are with the reference numerals 24A and 24B in each case the halves of the cam part 24 of which in normal operation and in emergency operation for inserting the cam half 24B is in use during emergency operation for laying the cam half 24A in use.

LIST OF REFERENCE NUMBERS

1

cable

2

cable cover

3

Cable soul

4

connector

5

connector

6

gearbox

7

grip

8th

guide pin

9

articulation

10

gear lever

11

guide sleeve

12

Ball joint

13

adjusting bush

14

electromechanical adjusting device

15

electric motor

16

drive shaft

17

gear

18

gear

19

adjusting nut

20

detent

21

cover

22

articulation

23

control rod

24

Control, cam part

24a

blocking portion

24b

sloping ramp

24c

sloping ramp

25

spring

26

Locking element, pawl

28

parking gear

29

Return spring

31

annular stop

I, II

Parking lock positions of the locking element 26

s

Travel Range

.DELTA.s

Zusatzstellweg

F _S

support forces

_P, P _out, P _{from N}

Control positions of the control 24

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10001446 A1 [0002, 0004, 0012]

Claims (8)

Device for actuating a parking brake for a change speed gearbox of a motor vehicle between a first parking brake position ( I ), in which a blocking element ( 26 ) of the parking lock is designed in particular, and a second parking brake position ( II ), in which the blocking element ( 26 ) of the parking lock is in particular inserted, with a particular electrically controllable adjustment ( 14 ), in normal operation a control ( 24 ) the parking brake within a travel (s) between a first control position (P _off ), in which the blocking element ( 26 ) in the first parking lock position ( I ), And (a second control position P _a) in which the blocking member ( 26 ) in the second parking lock position ( II ) is adjustable, and with an emergency operation ( 7 ), with which in emergency mode the control ( 24 ) (In an operating direction x), in particular a pulling direction (from the first control position P _off) (in the second control position P _a) is engageable, characterized in that (in emergency operation of the actuating path s) of the control element ( 24 ) is extended by an additional path (Δs) over which the control ( 24 ) While maintaining the actuating direction (x) from the second control position (P _a) in a third control position (P _{from N)} can be brought, in which the blocking member ( 26 ) the parking brake from the second parking brake position ( II ) back into the first parking lock position ( I ) is transferred. Device according to claim 1, characterized in that the control element ( 24 ) is an adjustable cam member which, via its cam contour on the blocking element ( 26 ), in particular a spring-biased pawl ( 26 ), which acts with a parking lock gear ( 28 ) is engageable in the output of the change gear, and in particular on the control ( 24 ) indirectly or directly a cable ( 1 ), by means of which the emergency operation ( 7 ) the blocking element ( 26 ) in the first and / or second parking brake position ( I . II ) brings. Device according to claim 1 or 2, characterized in that the control element ( 24 ) two counter-inclined ramps ( 24b . 24c ) and via the emergency operation ( 7 ) is adjustable such that the blocking element ( 26 ) is transferable from the one parking brake position to the other parking lock position. Device according to claim 3, characterized in that the two inclined ramps ( 24b . 24c ) on both sides of a middle barrier section ( 24a ) of the control ( 24 ) are arranged. Device according to one of the preceding claims, characterized in that the adjusting unit ( 14 ) on a cable casing ( 2 ) is arranged and in normal operation by appropriate control, the control ( 10 ) Adjusted between the first and the second control position (P _in, P _out). Device according to one of the preceding claims, characterized in that the emergency operation ( 7 ) one on the cable core ( 3 ) attached handle ( 7 ), when actuated in the actuating direction (x) the control element ( 24 ) (From the first switching position P _off) via the second switching position (P _a) and / or (in the same actuating direction x) is further operated by the second switch position (P _a) in the third switching position (P _{from N)} can be transferred. Device according to one of claims 3 to 6, characterized in that the control element ( 24 ) on a control rod cooperating with the parking brake actuation ( 23 ) slidably mounted and via a spring ( 25 ) is held in a stop position. Device according to one of the preceding claims, characterized in that the soul ( 3 ) of the cable ( 1 ) at least the transmission side of the cable housing ( 2 ) by rigid guide parts ( 8th . 11 ) can also be actuated by pressure.

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