DE102017212466A1 - Parksperrenaktorik with at least one lever element - Google Patents

Abstract

The invention relates to an arrangement with at least one lever element (1) for transmitting and generating a torque for engaging and disengaging a parking lock as a function of switching positions (P, N, D) of a selector switch of a transmission of a vehicle, wherein on the lever element (1) a curve geometry (2) is provided, which is in operative connection with at least one spring element for supporting at least the insertion movement.

Description

The present invention relates to an arrangement with at least one lever element according to the closer defined in the preamble of claim 1. Art.

From vehicle technology, it is known that, especially in heavier vehicles, such as an SUV, LCV or the like, components of a parking brake for locking and releasing a transmission of the vehicle must be made massive, so that the loads occurring in critical driving conditions of Vehicle safely can be recorded. For example, the enlargement of the cross sections of the components, in particular the parking pawl causes a mass increase, which requires an increase, for example, the spring forces in the parking brake. Thus, when driving the massively executed pawl for locking a parking lock gear of the parking brake is not undesirable to vibrate, it is necessary to increase a corresponding to insert the parking brake usually provided pawl spring with respect to their spring force accordingly. As a result, an increase in the spring force of a locking cone spring of a locking cone on a locking mechanism for actuating the pawl or for engaging the parking brake is disadvantageously required. In addition, higher spring forces are required so that the solid designed pawl also always inserts safely. A bias of the locking mechanism is usually ensured via a corresponding springing of a lever element. However, the increase of the spring forces also requires an increase in the holding force of a possibly existing locking the parking brake to hold the parking brake in the off state. Consequently, a disadvantageously larger-sized locking device is mandatory.

For example, from the document DE 35 37 091 C1 Such an arrangement with a locking mechanism for engaging the parking brake and a lever member for generating and transmitting a torque and a locking device for laying out and locking the parking brake is known. Since the Rastiereinrichtung is actuated by a correspondingly complex actuator, the increase in spring forces, for example, due to the solid executed parking lock pawl only by a costly adaptation and redevelopment of the locking device in a disadvantageous manner possible.

The present invention has for its object to provide an arrangement of the type described above with a lever element for generating and transmitting a torque for inserting and laying out a parking brake, which realizes a correspondingly adapted torque curve, so that the insertion and disengagement and locking the parking brake is ensured ,

Thus, an arrangement with at least one lever element or the like for transmitting and generating a torque for engaging and for designing a parking lock in response to switching positions of a selector switch of a transmission of a vehicle is proposed. In order to realize a torque curve adapted in a particularly simple manner, it is provided that a curve geometry is provided on the lever element, which is in operative connection with at least one spring element or the like for supporting at least the insertion movement.

Accordingly, an arrangement according to the invention is proposed, in which the lever element according to the invention is provided with a special curve geometry, which acts or presses a spring element, so that a predetermined torque curve in response to the rotation angle of the lever element can be realized. The lever element according to the invention can also be referred to as a lever-shaped parking lock or encoder disk.

The curve geometry and the spring element can be coordinated so that, for example, a constant, a degressive or a progressive torque curve with the lever element can be displayed. It is for example possible that the geometry of the curve and the spring element are designed so that changes the direction of action of the torque of the lever element within the pivoting range of the lever member. This can, for example, bring advantages for the assembly. In addition, it is conceivable that not only the insertion of the parking brake is supported, but also the interpretation and detenting or locking the parking brake, so that not only space advantages, but also cost advantages arise.

A structurally particularly simple way of realizing the curve geometry can be achieved, for example, by realizing the curve geometry by means of a cam contour or the like formed on the lever element. However, it is also conceivable that other constructive solutions for realizing the curve according to the invention or the predetermined torque curve are provided. For example, the lever element can also be made in several parts.

In order to further improve the mode of action according to the invention, it is also possible in the context of a development of the invention that the Lever element as an additional spring element, a torsion spring, for example, a leg spring or the like, is assigned, so that the resulting torque curve of the lever element results from the generated over the geometry of the curve with the spring element torque curve and the torque curve of the torsion spring. The combination of, for example, two spring elements results in an additional variation with respect to the torque curve to be realized.

The course of the curve geometry can be varied depending on the boundary conditions, so that, for example, a concave, convex, straight or even circular curve can be realized.

The arrangement according to the invention can preferably be used in a parking lock and is particularly advantageous when large actuation forces are required, but at the same time the locking or locking forces should be as low as possible. As a result, the lever element according to the invention improves the engagement of the parking lock especially when the parking brake is hydraulically engaged in the cold.

However, the application of the arrangement according to the invention is by no means limited to a parking brake. So it is readily conceivable to use this way of generating a predetermined torque curve for operating other devices.

• 1 eine dreidimensionale schematische Ansicht einer erfindungsgemäßen Anordnung mit einem Hebelelement zum Übertragen und Erzeugen eines Drehmomentes anhand einer Parksperre eines Fahrzeuges;
• 2 eine Seitenansicht der Anordnung gemäß 1;
• 3 ein Diagramm mit Drehmomentverläufen in Abhängigkeit eines Drehwinkels des Hebelelements;
• 4 eine Einzelteilansicht des Hebelelements;
• 5 eine schematische Ansicht des Hebelelements in einer Schaltposition P („Parken“);
• 6 eine schematische Ansicht des Hebelelements in einer Schaltposition D („Vorwärtsfahrbetrieb“); und
• 7 eine schematische Ansicht des Hebelelements in einer Montageposition.

Hereinafter, the present invention will be further explained with reference to the drawings. Show it:

• 1 a three-dimensional schematic view of an inventive arrangement with a lever member for transmitting and generating a torque based on a parking brake of a vehicle;
• 2 a side view of the arrangement according to 1 ;
• 3 a diagram with torque curves as a function of a rotation angle of the lever member;
• 4 an item view of the lever member;
• 5 a schematic view of the lever member in a shift position P ("Parking");
• 6 a schematic view of the lever member in a shift position D ("forward drive"); and
• 7 a schematic view of the lever member in a mounting position.

In the figures, different views of an inventive arrangement with at least one lever element 1 for transmitting and generating a torque shown by way of example by means of a parking lock. Furthermore, predetermined torque profiles generated by the arrangement are shown by way of example.

The arrangement according to the invention comprises the lever element 1 for transmitting and generating a torque for engaging and laying out, for example, a parking lock as a function of switching positions of a selector switch of a transmission of a vehicle.

In order to realize an adapted torque curve for ensuring the insertion and disengagement of the parking brake, is at the. lever member 1 a curve geometry 2 provided, which is operatively connected to at least one spring element for supporting at least the insertion movement. That in the 1 . 2 . 5 . 6 and 7 exemplary as a leaf spring 3 executed spring element is about an exemplary executed as a roller transmission element 4 in operative contact with the curve geometry 2 , which is along the curve geometry 2 moving active contact a changing lever arm 5 depending on the angle of rotation α of the lever element 1 causes. Due to the changing lever arm 5 Consequently, there is also a changed torque curve on the lever element 1 , The torque curve or the change in the lever arm 5 is determined by the selected curve geometry 2 on the lever element 1 depending on the angle of rotation α realized.

As in particular from 4 is apparent, the curve geometry 2 by a to the lever element 1 molded cam contour provided, which is a particularly simple construction of the curve geometry 2 represents.

A possible variant of the invention may provide that instead of the leaf spring 3 as a spring element, a compression spring is provided, which via a rolling body as a transmission element 4 with the curve geometry 2 Contact is active. The compression spring and the rolling elements can be realized constructively, for example by a ball catch or the like.

In an alternative embodiment, the contact between compression spring and curve geometry 2 also made sliding. In this case, designed as a compression spring spring element is a sliding bearing with the curve geometry 2 in operative contact.

Like, for example 1 it can be seen, the lever element 1 as an additional spring element a torsion spring 6 , for example, be associated with a leg spring or the like, so that the resulting torque curve of the lever element 1 from the over the curve geometry 2 with the as a leaf spring 3 executed spring element generated torque curve and the torque curve of the torsion spring 6 results.

In particular from the 1 and 2 the preferred application of the proposed arrangement is shown in a parking lock. The lever element 1 to insert the parking lock is this with a connecting rod 7 for actuating a locking mechanism 8th and for laying out the parking lock with a in a hydraulic control unit 10 arranged hydraulically actuated piston element 9 connected. As a locking mechanism 8th is in the embodiment shown here, inter alia, via a locking cone spring 18 Spring-loaded locking roller system 11 provided with the one via a pawl spring 19 spring-loaded pawl 12 for positive connection with a parking lock gear 13 the parking brake is actuated. The hydraulic control unit 10 includes in addition to the piston element 9 including an electromagnetically actuated locking device 14 , mittes of the piston element 9 is locked in such a way that the parking brake remains in the designed state and the pawl 12 (For example, when driving the vehicle) not in positive engagement with the parking lock gear 13 comes.

A corresponding diagram with the torque curves is in 3 over the rotation angle α of the lever element 1 shown, with the various switching positions P and D such as N are marked. The engagement of the parking brake is in the diagram of the shift position D via the switching position N to the switching position P shown while laying out the parking lock from the shift position P via the switching position N to the switching position D he follows. The required Rastiermoment the Rastiereinrichtung 14 is also shown in the diagram. That through the curve geometry 2 with the leaf spring 3 on the lever element 1 effected support torque is in the diagram by the torque curve I characterized by circles. That by the additional torsion spring 6 caused Abstützmoment on the lever element 1 is due to the torque curve II in 3 represented by dots. Finally, the torque curve shows III the resulting torque curve, which is characterized by crosses.

The in the diagram according to 3 shown torque curves I . II . III are only examples. It is, as already mentioned, also readily possible, only by the leaf spring 3 in conjunction with the curve geometry 2 caused torque curve I to use in order to realize a corresponding predetermined torque curve for assisting the insertion movement of the parking brake.

In the example shown in FIG 3 is the progressive torque curve I the degressive torque curve II the torsion spring 6 superimposed, this in the Einleebewegungsrichtung, namely of switching position D in the direction of the switching position P is related. This results in a resulting torque curve III also a progressive course, wherein the support torque to the shift position N corresponds to the Rastiermoment and to the switching position P below the Rastiermoments, whereby the Rastiereinrichtung 14 lower forces must apply and can be dimensioned smaller. To the switching position P is the support torque of the resulting torque curve III due to the progressive course significantly higher than Rastiermoment, so that the insertion movement of the pawl 12 through the locking roller system 11 by the on the lever element 1 through the leaf spring 3 acting torque is supported.

Consequently, via the lever element 1 with the at the curve geometry 2 supported spring element is realized on the selector shaft of the parking lock adjusting torque curve, by the waveform on the curve geometry 2 and by the spring force of the spring element or the leaf spring 3 structurally predefinable.

The associated rotational angle positions of the lever element 1 at the different switching position P and D are in the 5 and 6 shown. From these figures it can be seen how the respectively acting lever arm 5 due to the moving active contact on the curve geometry 2 depending on the angle of rotation α changed. 7 shows the rotational angle position of the lever element 1 for the mounting position, in which a direction of rotation reversal due to the active contact on the curve geometry 2 and the resulting lever arm 5 is provided. This direction reversal is in the diagram according to 3 through a zero crossing of the torque curve I at the switching position N clarified.

In the 5 . 6 and 7 the operation in the proposed arrangement is clarified again. The leaf spring 3 acts via the transfer element designed as a roll 4 on the curve geometry 2 , so that the active contact between transmission element 3 and curve geometry 2 a direction of force 15 results in a predetermined lever arm 5 related to the axis of rotation 8th of the lever element 1 causes. At the in 5 shown switching position P when the parking lock is engaged by the lever arm 5 a supporting moment causes, so that the lever element 1 is rotated against the clockwise direction, which by an arrow is indicated. By this support torque on the one hand, the insertion process is supported and on the other hand, the parking brake securely held in the inserted position. Consequently, the support safety for the locking mechanism 8th elevated.

In 6 is the transmission element 3 along the curve geometry 2 has been moved so that the direction of force 15 has changed accordingly. This results in a shorter lever arm 5 related to the axis of rotation 16 of the lever element 1 , The angular position of the lever element 1 corresponds to the switching position D in which the vehicle is in driving, so that it must be ensured that the parking brake is designed. Due to the lower lever arm 5 also results in a lower support torque, which is below the Rastiermoments the locking device 14 lies.

In 7 is the transmission element 4 further along the curve geometry 2 been moved so that the direction of force 15 aligned so that the resulting lever arm 5 a reversal of direction causes, so that the lever element 1 Now turn clockwise. This results in a negative torque in the torque curve I according to 3 and at the resulting torque curve III results in a course below the Rastiermomentes. This angular position of the lever element 1 is particularly suitable for the mounting position.

The curve geometry 2 on the lever element 1 can be chosen arbitrarily in the inventive arrangement depending on the application. In the figures, an approximately circular contour is chosen as an example, as in 6 is illustrated by an indicated circle. The lever element 1 can also be referred to as encoder disc or detent disk, since the lever element 1 a coding section 17 having, by means of position sensors, the exact angular position of the lever member 1 can be detected so that at any time the state of the parking brake is detected.

LIST OF REFERENCE NUMBERS

1

lever member

2

curve geometry

3

leaf spring

4

transmission element

5

lever arm

6

torsion spring

7

connecting rod

8th

locking mechanism

9

piston element

10

hydraulic control unit

11

Locking pulley system

12

pawl

13

parking gear

14

locking device

15

direction of force

16

Rotary axis of the lever element

17

coding section

18

Locking conical spring

19

Pawl spring

α

Angle of rotation of the lever element

P

Switching position "Parking"

D

Switching position "driving forward"

N

Switching position "neutral"

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 3537091 C1 [0003]

Claims (10)

Arrangement with at least one lever element (1) for transmitting and generating a torque for engaging and disengaging a parking lock as a function of switching positions (P, N, D) of a selector switch of a transmission of a vehicle, characterized in that on the lever element (1) a Curve geometry (2) is provided, which is operatively connected to at least one spring element for supporting at least the insertion movement. Arrangement according to Claim 1 , characterized in that the spring element via a transmission element (4) in operative contact with the curve geometry (2), wherein the along the curve geometry (2) moving operative contact a changing lever arm (5) in dependence of the rotation angle (α) of the lever element (1) causes. Arrangement according to Claim 1 or 2 , characterized in that by the selected curve geometry (2) on the lever element (1) a predetermined torque curve (I, II, III) in dependence of the rotation angle (α) is provided. Arrangement according to one of the preceding claims, characterized in that the curve geometry (2) by a to the lever element (1) integrally formed cam contour is provided. Arrangement according to one of the preceding claims, characterized in that a leaf spring (3) is provided as the spring element. Arrangement according to one of Claims 1 to 4 , characterized in that a compression spring is provided as the spring element, which is in operative contact via a rolling element as a transmission element with the curve geometry (2). Arrangement according to one of Claims 1 to 4 , characterized in that a compression spring is provided as the spring element, which is in operative contact via a sliding bearing with the curve geometry (2). Arrangement according to one of the preceding claims, characterized in that the lever element (1) as an additional spring element, a torsion spring (6) is assigned, so that the resulting torque curve (III) of the lever element (1) from the on the curve geometry (2) with the Spring element generated torque curve (I) and the torque curve (II) of the torsion spring (6). Arrangement according to one of the preceding claims, characterized in that the lever element (1) for engaging the parking brake with a connecting rod (7) for actuating a locking mechanism (8) and for laying out the parking brake with a hydraulically actuated piston element (9) of a hydraulic control unit ( 10) is connected, wherein the hydraulically actuated piston element (9) via an electromagnetically actuated locking device (14) can be latched. Arrangement according to Claim 8 or 9 , characterized in that as locking mechanism (8) a locking roller system (11) for actuating a pawl (12) for positive connection with a parking lock wheel (13) of the parking brake is provided.

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