DE102018006093B4 - Parking lock module for actuating a parking lock in a motor vehicle - Google Patents

Abstract

Parking lock module (10) for actuating a parking lock (12) in a motor vehicle, with a housing (30) in which an actuator (40) for actuating the parking lock (12) is accommodated in a longitudinally displaceable manner, which can be moved from a locked position into an unlocked position and vice versa and can be selectively fixed relative to the housing (30) by means of a locking device (46), which has a latching contour (60) fixed to the actuator and a latching element (62) on the housing, which moves from a locking position in which it engages with the latching contour (60). located, can be moved into a release position in which it releases the latching contour (60), and vice versa, the latching element (62) being pretensioned into the locking position by means of a spring (64) and counter to the pretensioning by the spring (64) by means of a electromagnetic actuator (66) with an armature (68) that can be displaced along an infeed axis (Z) and/or a fluidic actuator (70) with an active surface that can be pressurized (72) can be moved into the release position, characterized in that the latching element (62) is displaceably guided along the infeed axis (Z), the armature (68) of the electromagnetic actuator (66) and the active surface (72) of the fluidic actuator ( 70) are arranged coaxially with respect to the infeed axis (Z).

Description

TECHNICAL AREA

The invention relates to a parking lock module for actuating a parking lock in a motor vehicle, according to the preamble of claim 1. In particular, the invention relates to a parking lock module, as has recently been used in motor vehicles with hybrid transmissions and modern transmissions with an automatic character (automated manual transmissions ) are used extensively in the automotive industry.

STATE OF THE ART

Parking locks are needed in particular when a self-locking effect of the drive (motor) cannot be used to hold the motor vehicle. The drive train is then generally locked via a parking lock wheel which is non-rotatably arranged on an output shaft of the transmission and has teeth, which can be positively locked on the teeth by means of a parking lock pawl pivoted on a parallel axis, the parking lock pawl counteracting the force of a return spring must be pivoted, which biases the parking lock pawl away from the parking lock gear to an unlocked position.

In addition to electrically, electrohydraulically or hydraulically actuated parking lock actuators can also be used for this purpose, which serve to generate a linear movement via which an actuating element, e.g. in the form of a cam or a cone, can be moved against the parking lock pawl in order to pivot it. In order to ensure that the parking lock also prevents the motor vehicle from rolling away if the parking lock pawl comes into contact with a tooth of the parking lock wheel when it is actuated without coming into positive contact with the toothing, an energy store (return spring) can also be provided on the actuating element in the event of the motor vehicle rolling, the parking lock pawl moves up via the actuating element, so that it engages with the toothing of the parking lock wheel. In addition, it is usually necessary to ensure that the actuating element is locked in its respective actuating position with respect to the parking lock pawl - holding the parking lock pawl pivoted into engagement with the parking lock wheel or releasing the parking lock pawl - without the application of energy (electricity or pressure) and a Emergency operation is possible, which allows the parking lock to be engaged if the actuator fails.

In the prior art, there is no lack of proposals to implement these functions in an integrated manner in a parking lock module for actuating a parking lock in a motor vehicle. Such a parking lock module is disclosed, for example, in the publication forming the preamble of patent claim 1 DE 10 2015 008 709 A1 . According to this prior art, the parking lock module has a pressure chamber housing in which an actuator in the form of a piston element is accommodated as part of an actuating mechanism. An actuating member in the form of a shift rod is articulated on the piston element. The piston element, which is longitudinally displaceable along a displacement axis of the pressure chamber housing, is prestressed in a parking lock insertion direction via a piston spring with a spring force into a blocked position in which it can be selectively fixed relative to the pressure chamber housing by means of a locking unit. Furthermore, the piston element can be pressurized via a hydraulic pressure chamber in the pressure chamber housing in a parking lock disengagement direction opposite to the parking lock engagement direction in order, when the locking unit is released, to assume an unlocked position against the spring force of the piston spring, in which position the piston element can in turn be selectively fixed relative to the pressure chamber housing by means of the locking unit.

Here, on the shift rod, more precisely on the end facing away from the piston element, an actuating cone is arranged axially displaceably, which is biased by a spring element opposite the shift rod in the parking lock engagement direction to a stop provided on the shift rod. When the piston element moves into the unlocked position, the actuating cone can thus be pulled over the stop in the parking lock disengagement direction. The actuating cone has an actuating bevel, which can be brought into contact with a cone guide element fixed to the pressure chamber housing in the form of a metal support plate, so that the actuating bevel is supported on an alignment bevel of the support plate during a longitudinal movement of the shift rod in the parking lock engagement direction caused by the piston element, thereby deflecting the Shift rod relative to the piston element causes a movement of the actuating cone in a transverse direction in order to actuate the parking lock, i.e. its locking element (parking lock pawl).

In this prior art, the aforementioned latching unit comprises (see 3 and 4 the pamphlet DE 10 2015 008 709 A1 ) as a locking element, first a locking lever, which is received in a housing recess formed transversely to the displacement axis of the piston element in the pressure chamber housing and ver there about a pivot axis is pivotable, which runs parallel to the displacement axis of the piston element. In order to fix the piston element in its locked position or its unlocked position relative to the pressure chamber housing, the locking lever can be positively engaged with a locking contour provided on the piston element (locked state).

The locking lever can be switched passively into its locked state and actively into an unlocked state in which it is disengaged from the locking contour on the piston element. For the (passive) setting of the locking state, the locking unit has a restoring spring, which acts on a projection of the locking lever at a distance from the pivot axis in order to pivot and hold the locking lever in its locking state.

For the (active) setting of the unlocked state, on the other hand, the previously known latching unit has an actuator system which is used to pivot the latching lever into its unlocked state against a spring force of the return spring. This actuator is designed redundantly and includes a hydraulic actuator and an electromagnetic actuator, which individually or jointly pivot the latching lever into its unlocked state and thereby release the displacement of the piston element. The hydraulic actuator has a small, cylindrical piston that can be hydraulically acted upon on a circular active surface via a (further) pressure chamber formed in the pressure chamber housing. The small piston acts on an extension of the detent lever, which is formed on the detent lever on an opposite side with respect to the projection for the return spring. The electromagnetic actuator, on the other hand, has a lifting magnet flanged to the pressure chamber housing with an armature that has a pin-shaped end. The pin-shaped end can be displaced along a feed axis intersecting the displacement axis of the piston element and engages an arm of the locking lever, which is formed on the locking lever between the projection for the return spring and the extension for engaging the hydraulic actuator.

Finally, with this prior art, the respective position of the piston element with respect to the pressure chamber housing can be detected by means of a sensor arrangement which has a displacement sensor which is stationary relative to the pressure chamber housing and a permanent magnet outside the pressure chamber housing which is coupled axially fixed to the piston element via a magnet holder in order to prevent movement of the piston element to be detected by the displacement sensor. An actuation state of the parking lock module can thus be detected.

A disadvantage of this prior art can be seen in particular in the fact that the design of the latching unit with a large number of parts and their assembly in or on the parking lock module is associated with considerable effort, which is undesirable in mass production. In addition, the locking unit of the previously known parking lock module requires a relatively large amount of space. However, the installation space available for the parking lock module on/in the transmission housing is usually very tight. Other parking lock modules are in the publications DE 10 2011 105 068 A1 , EP 2 458 226 A1 , DE 10 2008 001 976 B4 such as EP 3 478 992 B1 disclosed.

TASK

The object of the invention is to create a parking lock module for actuating a parking lock in a motor vehicle that is as simple as possible, which avoids the above disadvantages and, in particular, requires less installation space than the prior art described.

PRESENTATION OF THE INVENTION

This object is achieved by a parking lock module for actuating a parking lock in a motor vehicle with the features of claim 1. Advantageous configurations of the invention are the subject matter of the dependent claims.

In a parking lock module for actuating a parking lock in a motor vehicle, which has a housing in which an actuator for actuating the parking lock is accommodated in a longitudinally displaceable manner, which can be moved from a locked position into an unlocked position and vice versa and can be selectively fixed relative to the housing by means of a locking device, which has a locking contour fixed to the actuator and a locking element on the housing side, which can be moved from a locking position, in which it is in engagement with the locking contour, into a release position, in which it releases the locking contour, and vice versa, the locking element being moved into the locking position by means of a spring is prestressed and can be moved into the release position counter to the prestressing by the spring by means of an electromagnetic actuator with an armature that can be displaced along an infeed axis and/or a fluidic actuator with an active surface that can be pressurized; According to the invention, the latching element is guided so as to be displaceable along the infeed axis, with the armature of the electromagnetic actuator and the active surface of the fluidic actuator being arranged coaxially with respect to the infeed axis.

Due to the fact that the latching element can be moved along the infeed axis of the armature, i.e. linearly and in alignment with the armature, while the active surface of the fluidic actuator is also coaxial with the infeed axis, the voluminous and complex force deflection known from the prior art via the Locking lever and its lever arms entirely. The same applies to the effort associated with the design and assembly of the locking device in the prior art, due to the recess running there transversely to the actuator for receiving the pivotable locking lever and the spatially separate receiving and attachment locations for the passive locking lever spring and the hydraulic and the electromagnetic actuator for active actuation of the locking lever in or on the housing of the parking lock module.

According to the invention, there is also less installation space required for the locking device and thus for the parking lock module as a whole. The coaxial alignment of the latching element, the armature of the electromagnetic actuator and the active surface of the fluidic actuator with the infeed axis of the electromagnetic actuator in a very compact design results in an advantageously direct application of force to release the locking between the latching element and latching contour along only one axis.

In addition, the locking device according to the invention can advantageously be implemented with fewer components on the parking lock module, with the guidance of the latching element being simpler in design and more cost-effective to produce compared to the prior art described at the outset. Last but not least, the locking device according to the invention can also be designed more simply as a closed functional unit of the parking lock module that is protected against contamination that may impair its function.

The common infeed axis of the electromagnetic and fluidic actuators of the locking device preferably extends essentially transversely to a displacement axis of the actuator, along which the actuator is longitudinally displaceable in the housing of the parking lock module. In principle, the infeed axis can also run at a different angle, i.e. deviating from about 90° with respect to the displacement axis of the actuator, but this is less preferred with regard to the force application of the locking device being as equal as possible and independent of the locked position and unlocked position of the actuator.

In principle, the electromagnetic actuator and the fluidic actuator can also be arranged at one and the same axial height with respect to the infeed axis. In contrast, however, an embodiment is preferred in which the electromagnetic actuator and the fluidic actuator are arranged one behind the other on the infeed axis. As a result of the better possible separation of the electrical and hydraulic components of the locking device, these can advantageously each be designed in a simpler manner and with less radial space requirement.

It is particularly preferred here if the fluidic actuator is located in front of the electromagnetic actuator with respect to the control element on the infeed axis. In principle, the electromagnetic actuator can also be arranged in front of the fluidic actuator with respect to the control element on the infeed axis, but this configuration would be more complex and would require more installation space.

In a preferred embodiment of the parking lock module, the spring for prestressing the latching element and the armature of the electromagnetic actuator are also arranged coaxially with respect to the infeed axis, which has the particular advantage that the spring force does not act on the latching element or the armature of the electromagnetic actuator. In this case, the spring for prestressing the latching element can also advantageously be dimensioned small, since it lies in the axis of the infeed movement with a centered introduction of force. However, an embodiment with a plurality of springs, which are angularly distributed around the infeed axis at a radial distance from the infeed axis, is also conceivable, although this would involve greater effort.

In particular with regard to the smallest possible radial installation space requirement, the spring for prestressing the latching element and the armature of the electromagnetic actuator can be arranged one behind the other on the infeed axis. An arrangement of the spring and armature at the same axial height with respect to the infeed axis would also be possible, but would require a larger radial space and would require more effort.

In this case, the armature of the electromagnetic actuator is preferably located in front of the spring for prestressing the latching element with respect to the actuating element on the infeed axis. Compared to a likewise conceivable alternative with the spring in front of the armature, the first-mentioned configuration is advantageous with regard to a particularly small installation space requirement.

In further pursuit of the inventive concept, the spring for prestressing the locking element can be integrated in the electromagnetic actuator of the locking device, which in turn is particularly which is advantageous with regard to a small installation space requirement and an embodiment of the locking device with as few components as possible.

A coiled strip spring, such as an evolute spring or a double evolute spring, a small plate spring assembly or an elastomeric spring element (rubber spring) can be used as the spring for prestressing the latching element. In contrast, however, it is preferred, particularly with a view to the highest possible reliability, low costs and good availability, if the spring for prestressing the latching element is a helical compression spring. However, a tension spring solution is also conceivable.

Also particularly preferred is an embodiment of the parking lock module in which the latching element is formed as a piston, which forms the effective surface of the fluidic actuator that can be pressurized. Compared to the state of the art described at the outset, this saves in particular on components on the locking device.

In principle, a separate (partial) housing can be provided for the latching element, which is flanged to the housing of the parking lock module in a modular manner. In contrast, however, it is preferable if the latching element is guided in a recess in the housing of the parking lock module, which in turn promises less effort and a smaller installation space requirement compared to the above alternative. In addition, the geometric assignment of the latching element to the actuator in the housing of the parking lock module is particularly simple.

In principle, the locking element can be guided directly or immediately in the recess of the housing or together with a guide for the armature of the electromagnetic actuator. In a preferred embodiment, the latching element is guided in the recess of the housing with the aid of a guide sleeve, which is particularly useful when the housing is made of a plastic material, in order to ensure high local stability with little wear.

In principle, the latching element and the associated recess in the housing can have any complementary geometries that ensure the axial guidance of the latching element in the recess. With regard to the simplest possible production and the greatest possible ease of movement of the guide, however, it is preferred if the latching element and the recess of the housing are designed to be rotationally symmetrical about the infeed axis.

In an advantageous embodiment of the parking lock module, the latching element and the recess of the housing also delimit an annular pressure chamber via which the effective surface of the fluidic actuator can be pressurized, the annular pressure chamber being sealed off by means of a sealing arrangement which, viewed along the infeed axis, is on both sides of the annular pressure chamber each has a sealing element. The sealing elements can be arranged fixed to the locking element or fixed to the housing. Depending on the use and position of the parking lock module in the motor vehicle, however, it is also conceivable to work without sealing elements between the latching element and the housing and, in principle, to allow leakage from the annular pressure chamber or at another point to the locking device for sealing the fluidic actuator to the outside care for.

Finally, there are also several options for designing the operative connection between the latching element and the armature of the electromagnetic actuator of the locking device. For example, the latching element can be connected to the armature of the electromagnetic actuators be connected. However, in particular with regard to a simple and process-reliable production of the connection, it is preferably provided that the latching element and the armature of the electromagnetic actuator are connected to one another directly by means of a press fit.

character list

• 1, eine perspektivische Ansicht eines erfindungsgemäßen Parksperrenmoduls in seiner Gebrauchslage an einer hier nur schematisch gezeigten Parksperre mit einer Sperrklinke und einem Parksperrenrad von schräg oben / vorne links;
• 2 eine perspektivische Ansicht des Parksperrenmoduls gemäß 1 von schräg unten / hinten links, ohne die Elemente der Parksperre;
• 3 eine Draufsicht auf das Parksperrenmodul gemäß 1 von oben in 1, mit Sperrklinke;
• 4 eine Unteransicht des Parksperrenmoduls gemäß 1 von unten in 1, wiederum ohne die Elemente der Parksperre;
• 5 eine Schnittansicht des Parksperrenmoduls gemäß 1 entsprechend der versetzten Schnittverlaufslinie V-V in 3, ebenfalls mit Sperrklinke;
• 6 eine Schnittansicht des Parksperrenmoduls gemäß 1 entsprechend der versetzten Schnittverlaufslinie VI-VI in 3;
• 7 eine Schnittansicht des Parksperrenmoduls gemäß 1 entsprechend der Schnittverlaufslinie VII-VII in 4;
• 8 eine zu allen Seiten abgebrochene, im Maßstab vergrößerte Schnittansicht des Parksperrenmoduls gemäß 1 entsprechend dem Detail VIII in 7;
• 9 eine zu allen Seiten abgebrochene, im Maßstab vergrößerte Schnittansicht des Parksperrenmoduls gemäß 1 entsprechend dem Detail IX in 7;
• 10 eine Schnittansicht des Parksperrenmoduls gemäß 1 entsprechend der Schnittverlaufslinie X-X in 4;
• 11 eine Schnittansicht des Parksperrenmoduls gemäß 1 entsprechend der Schnittverlaufslinie XI-XI in 4;
• 12 eine zu den Seiten abgebrochene, im Maßstab vergrößerte Schnittansicht des Parksperrenmoduls gemäß 1 entsprechend der Schnittverlaufslinie XII-XII in 8.

The invention is explained in more detail below using a preferred exemplary embodiment with reference to the attached, partially schematic drawings. In the drawings show:

• 1 , a perspective view of a parking lock module according to the invention in its position of use on a parking lock shown here only schematically with a pawl and a parking lock wheel from diagonally above / front left;
• 2 a perspective view of the parking lock module according to FIG 1 from diagonally below / rear left, without the elements of the parking lock;
• 3 a top view of the parking lock module according to FIG 1 from above in 1 , with pawl;
• 4 a bottom view of the parking lock module according to FIG 1 from below in 1 , again without the elements of the parking lock;
• 5 a sectional view of the parking lock module according to 1 according to the offset line of intersection VV in 3 , also with pawl;
• 6 a sectional view of the parking lock module according to 1 according to the offset line of intersection VI-VI in 3 ;
• 7 a sectional view of the parking lock module according to 1 according to section line VII-VII in 4 ;
• 8th a sectional view of the parking lock module broken off on all sides and enlarged in scale 1 according to detail VIII in 7 ;
• 9 a sectional view of the parking lock module broken off on all sides and enlarged in scale 1 according to detail IX in 7 ;
• 10 a sectional view of the parking lock module according to 1 according to the section line XX in 4 ;
• 11 a sectional view of the parking lock module according to 1 according to the section line XI-XI in 4 ;
• 12 a sectional view of the parking lock module broken off to the sides and enlarged in scale 1 according to section line XII-XII in 8th .

In the drawings, elastic or elastomeric components, namely the dynamic seals, are shown in the undeformed state to simplify the illustration; in reality, these deformable components abut the adjacent surfaces of adjacent components.

DETAILED DESCRIPTION OF THE EMBODIMENT

In the figures, reference numeral 10 generally designates a parking lock module for actuating a parking lock 12 in a motor vehicle. The parking lock 12 has according to 1 in a manner known per se, a parking lock gear 14 which is arranged in a rotationally and axially fixed manner on a transmission shaft of a motor vehicle transmission, not shown, and has teeth 16 on the outer peripheral side. For positive locking of the drive train of the motor vehicle, the parking lock 12 also includes a pawl 18 (only in the 1 , 3 and 5 drawn in), which is articulated on a transmission housing, not shown here, such that it can pivot about a pivot axis 20 . The pawl 18 has a locking tooth 22 which, when the pawl 18 pivots about the pivot axis 20, is able to engage in a form-fitting manner with the teeth 16 of the parking lock wheel 14. The reference numeral 24 indicates a bore in the pawl 18, which is acted upon by a restoring spring (not shown here) that is supported relative to the transmission housing and biases the pawl 18 about the pivot axis 20 away from the parking lock wheel 14 into an unlocked position.

For pivoting the pawl 18 about the pivot axis 20, an actuating element 26 is provided on the parking lock module 10, which in the illustrated embodiment according to 7 (double) conical surface section 28 has. The actuating element 26 is to be described in more detail by means of an actuating mechanism 32 accommodated in a housing 30 of the parking lock module 10 (see FIG 7 ) via an articulated to the actuating mechanism 32 connected actuator 34 selectively in a locking direction S or an unlocking direction E axially displaceable, as in the 1 , 3 , 4 and 7 until 9 indicated with arrows. The conical surface section 28 of the actuating element 26 is supported in accordance with FIG 1 on a housing-fixed cone guide element in the form of a metallic support plate 36, which has a support section 38 for this purpose.

Thus, with an axial movement of the actuating element 26 in the blocking direction S, the pawl 18 in 1 raised against the force of the return spring, not shown, rotating about the pivot axis 20 in order to positively engage the locking tooth 22 with the teeth 16 of the parking lock gear 14 . On the other hand, when the actuating element 26 moves axially in the unlocking direction E, the conical surface section 28 of the actuating element 26 is pulled away from its position between the pawl 18 and the support plate 36 . As a result, the pawl is 18 in 1 is lowered due to the force of the return spring rotating about the pivot axis 20, the locking tooth 22 being disengaged from the toothing 16 of the parking lock wheel 14.

In the exemplary embodiment shown, housing 30 is made of a plastic material, along with other parts of parking lock module 10, with metal support plate 36 being integrated in housing 30 in such a way that support section 38 of support plate 36 is able to contact actuating element 26 via the plastic material of the housing 30 (see in particular the 1 and 5 ), as in the earlier German patent application DE 10 2018 003 752.6 is described in detail by the same applicant, to which expressly referred to at this point for further details in this regard.

For further details of the actuating mechanism 32 is first in particular to the 7 referred. Accordingly, the actuating mechanism 32 has a piston 40 accommodated in the housing 30 of the parking lock module 10 as an actuator, which is longitudinally displaceable along a central axis M forming a displacement axis and is operatively connected to a piston rod 42 of the actuating element 34 . The piston 40 is in the blocking direction S via a piston spring 44 with a spring force in a blocking position (in the 7 until 9 shown) prestressed, in which it can be optionally fixed relative to the housing 30 by means of a locking device 46 explained in more detail below. Furthermore, the piston 40 can be pressurized via a pressure chamber 48 provided in the housing 30 in the unlocking direction E, which is opposite to the locking direction S, in order, when the locking device 46 is released, to assume an unlocking position against the spring force of the piston spring 44, in which the piston 40 is again moved by means of the locking device 46 relative to the Housing 30 can be fixed. Accordingly, the piston 40 can be moved from the locked position to the unlocked position and vice versa, depending on the actuation state of the locking device 46, and can be held in the respective position.

The actuating element 26 , which is arranged so as to be axially displaceable on the piston rod 42 , is also prestressed by means of a piston rod spring 50 (return spring) in relation to the piston rod 42 in the blocking direction S onto a stop 52 provided on the piston rod 42 . The piston rod spring 50 designed as a helical compression spring serves as an energy store in the event that the locking pawl 18 comes to rest with its locking tooth 22 against a tooth of the parking lock wheel 14 when it is actuated by the parking lock module 10 without coming into positive contact with the teeth 16. In such a situation, the piston rod spring 50 ensures that the spring-loaded actuating element 26 advances the pawl 18 when the motor vehicle rolls, so that its locking tooth 22 engages with the toothing 16 of the parking lock wheel 14 . In the opposite direction, the actuating element 26 can be moved in the unlocking direction E, i.e. pulled, with a movement of the piston 40 into the unlocked position via the stop 52 .

The respective axial position of the piston 40 in the housing 30 can be detected here by means of a sensor arrangement 54, which is also described in more detail below 7 and 9 generally includes a position detector 56 stationary with respect to housing 30 and a position transducer 58 operatively connected to piston 40 . By means of the sensor arrangement 54, the respective operating state of the parking lock module 10 can be detected, ie whether the piston 40 of the operating mechanism 32 is in the locked position 7 or is in the unlocked position. On the other hand, damage to the parking lock module 10, for example a possible fracture of the piston spring 44, can be detected. In addition, however, the engagement or disengagement of the parking lock 12 can also be controlled, namely by detecting the stroke of the piston 40 and subjecting the pressure chamber 48 to pressurization. It is also possible to detect a "ratcheting" of the pawl 18 via the teeth 16 of the Determine parking lock wheel 14, which can be counteracted by pressurizing the pressure chamber 48.

The locking device 46 for selectively fixing the piston 40 relative to the housing 30 comprises in accordance with in particular 7 , 8th and 10 generally an actuator, i.e. piston-fixed, latching contour 60 and a housing-side latching element 62 that interacts with it. The latching contour 60 has latching sections for defining the locked position and the unlocked position of the piston 40 is in engagement with the locking contour 60, movable into a release position in which it releases the locking contour 60, and vice versa. The latching element 62 is passively biased into the locking position by means of a spring 64 . Contrary to the preload by the spring 64, the latching element 62 can be actively moved into the release position by means of an electromagnetic actuator 66 with an armature 68 that can be displaced along an infeed axis Z and/or a fluidic actuator 70 with an active surface 72 that can be pressurized. In the exemplary embodiment shown, the actuation arrangement for reaching the release position of the latching element 62 is therefore designed with twofold redundancy.

As will be explained in detail below, compared to the prior art described above, there are various special features of the parking lock module 10 according to the exemplary embodiment shown, primarily in the following five points (i to v): First (i) the locking element 62 is along the Infeed axis Z is displaceably guided, with the armature 68 of the electromagnetic actuator 66 and the pressurizable active surface 72 of the fluidic actuator 70 being arranged coaxially with respect to the infeed axis Z in a very compact configuration of the parking lock module 10 (see in particular the 8th ). Also (ii) the spring 64 is for biasing of the latching element 62 in the electromagnetic actuator 66 of the locking device 46 integrated (cf. again the 7 , 8th and 10 ), which is also a small space requirement of the parking lock module 10 is conducive. The same applies to the further special feature that (iii) the latching element 62 itself is formed as a piston 74, which is guided in a displaceable manner along the infeed axis Z and forms the effective surface 72 of the fluidic actuator 70 that can be pressurized (see in particular the 8th ), With parts being saved compared to the prior art described above. In addition, with a further view of the sensors (sensor arrangement 54), it is advantageously provided that (iv) the electromagnetic actuator 66 of the locking device 46 and the position detector 56 of the sensor arrangement 54 can be contacted together via an electrical interface 76 which is integrated in the parking lock module 10 ( see in particular the 2 , 4 , 7 and 9 ), which significantly reduces the installation and contacting effort associated with the sensors compared to the prior art. Finally, the same applies to the special feature that (v) the electromagnetic actuator 66 of the locking device 46 can be controlled via a printed circuit board 78 attached to the housing 30 of the parking lock module 10, which also carries the position detector 56 of the sensor arrangement 54, as best shown in FIGS 9 and 11 you can see.

As far as the attachment of the parking lock module 10 in the motor vehicle is concerned, both the support plate 36 and the housing 30 are provided with attachment holes 80, which are parallel through-holes in the support plate 36 or metal-lined through-holes in the housing 30 at locations as far apart as possible from the support plate 36 and housing 30 are formed as best shown in FIGS 2 until 6 can be seen. When the parking lock module 10 is installed, head screws (not shown in the figures) pass through the mounting holes 80 and are screwed into associated threaded holes in the transmission housing (not shown) in order to position the parking lock module 10 with respect to the transmission housing and to pull it firmly against the transmission housing.

The actuating mechanism 32 accommodated inside the housing 30 and its connection to the actuating member 34 are described in the older German patent application DE 10 2018 003 749.6 described in detail by the same applicant, to which reference is expressly made at this point for further details in this regard. In contrast, the parking lock module 10 according to the present exemplary embodiment has only a few differences, as will be briefly described below.

An obvious difference in the present exemplary embodiment is that a pressure piece 82, via which the piston spring 44 acts on the piston 40 and which can be displaced by means of the piston spring 44 against the spring force of the piston spring 44 relative to the piston 40 in the unlocking direction E, directly in a the housing 30 in 7 to the right-closing guide bushing 84 is guided. In this case, the guidance is secured against rotation by means of a guide extension 86 with an essentially square cross section (see 6 ), which passes through a complementarily shaped opening 88 in the guide bushing 84.

Furthermore, there is an obvious difference from the older design in that the position transmitter 58 of the sensor arrangement 54 is mounted inside the housing 30 directly on the actuator, ie directly on the piston 40, which is also designed here as a plastic injection molded part. To put it more precisely, the sensor arrangement 54 in the present exemplary embodiment is also preferably a Hall sensor system, with a Hall element 90 as a component of the position detector 56 fixed to the housing ( 9 ) and a magnet as a position transmitter 58, which is embedded in the piston 40 by overmolding with the plastic material of the piston 40, i.e. it is not located outside the housing 30 and would be connected to the piston 40 via a holder.

As in the older construction, the piston 40 is held in the in 7 shown locked position of the parking lock module 10 against an annular stop surface 92 of the housing 30 biased. The mating surface 94 on the piston 40 is part of an annular effective surface which delimits the pressure chamber 48 and via which the piston 40 can be hydraulically acted upon in the unlocking direction E. For the hydraulic loading of the pressure chamber 48 and thus the piston 40 has the housing 30 according to 2 , 4 and 11 on the underside an integrally formed pressure connection 96, which communicates with the pressure chamber 48 between the housing 30 and the piston 40 (see 11 ).

On the in the 7 and 8th At the left end, the piston 40 is reinforced on the outer circumference for engagement by the locking device 46 with a metallic collar sleeve 98 embedded in the plastic material of the piston 40 . The collar sleeve 98 forms the locking contour 60 on the outer circumference, which by means of the locking device 46 allows the piston 40 to be locked in relation to the housing 30 either in the locked position or in the unlocked position of the piston 40 .

especially the 7 , 8th , 10 and 12 now show further details of the locking device 46, which in the illustrated embodiment - as already mentioned above - has two independently controllable unlocking mechanisms, namely the electrically controllable unlocking mechanism (electromagnetic actuator 66 with the armature 68 movable along the infeed axis Z) and the hydraulically controllable unlocking mechanism (Fluid actuator 70 with the pressurizable active surface 72). Both unlocking mechanisms are used to the locking element 62 against the spring force of the spring 64 optionally from its in the 7 , 8th and 10 shown detent position on the collar sleeve 98 of the piston 40 in a distant from the collar sleeve 98 unlocked position, which allows movement of the piston 40 along the central axis M.

The spatial relative position of the individual components of the locking device 46 in relation to the infeed axis Z of the armature 68 of the electromagnetic actuator 66 and the piston 40 of the actuating mechanism 32 and its displacement axis (central axis M) in the housing 30 can initially be discussed in particular by looking at the 8th In general, the following can be stated: The infeed axis Z of the armature 68 extends essentially transversely to the displacement axis M of the piston 40 and intersects it (cf. 10 ). The fluidic actuator 70 and the electromagnetic actuator 66 are arranged one behind the other on the infeed axis Z. The fluidic actuator 70 is on the infeed axis Z in front of the electromagnetic actuator 66 with respect to the piston 40. Furthermore, the latching element 62 and the spring 64 for preloading the latching element 62 with respect to the infeed axis Z are arranged coaxially, which is also the case for the armature 68 of the electromagnetic actuator 66 and the spring 64 applies. More precisely, the spring 64 and the armature 68 are arranged one behind the other on the infeed axis Z. In this case, the armature 68 lies in front of the spring 64 with respect to the piston 40 on the infeed axis Z.

The armature 68 is thus located between the latching element 62 and the spring 64.

Like those in particular 8th shows, the housing 30 of the parking lock module 10 is provided with a stepped recess 100 for accommodating the latching element 62, which is formed from metal as a stepped piston 74 to form the effective surface 72 that can be pressurized. The locking element 62 is guided in the recess 100 of the housing 30 , for which purpose a partial area of the recess 100 close to the piston 40 is lined with a metal guide sleeve 102 . The recess 100 and the latching element 62 are designed to be rotationally symmetrical about the infeed axis Z, as shown in FIG 12 can be seen, as well as the guide sleeve 102. At the bottom of the recess 100, the housing 30 is provided with an opening 104, which connects the recess 100 to the interior of the housing 30, in which the piston 40 is accommodated in a longitudinally displaceable manner. The latching element 62 has a pin-shaped end 106 which can be brought into engagement with the latching contour 60 on the piston 40 and for this purpose reaches through the opening 104, as shown in FIG 8th shown.

At the middle level of the recess 100 in the housing 30 and thus at the level of the step of the piston 74, the latching element 62 and the recess 100 delimit an annular pressure chamber 108 via which the effective surface 72 of the fluidic actuator 70 can be pressurized. For hydraulic loading of the pressure chamber 108 and thus the piston 74, the housing 30 has according to 2 and 4 on the underside a further pressure connection 110 integrally formed on the housing 30 in parallel arrangement to the pressure connection 96. The pressure connection 110 communicates with the annular pressure chamber 108 via a connecting channel 112 formed in the housing 30 and running transversely to the infeed axis Z and to the central axis M (see in particular the 4 , 8th and 12 ). As best in 12 can be seen, the connecting channel 112 intersects with its inner end the recess 100 for receiving the locking element 62. At its other, outer end, the connecting channel 112 is shown in FIG 12 sealed to the atmosphere with a plastic plug 114 which is ultrasonically welded to the housing 30 .

According to particular 8th the latching element 62 is provided axially in the region of the annular pressure chamber 108 with a recess 116 running around the infeed axis Z for better flow onto the hydraulic active surface 72 of the piston 74 . the 8th and 10 also show that the annular pressure chamber 108 is sealed off by means of a sealing arrangement 118 between the piston 74 and the recess 100 . The sealing arrangement 118 has a sealing element 120 , 122 on both sides of the annular pressure chamber 108 , viewed along the infeed axis Z. The sealing elements 120, 122 are accommodated in respective assigned radial grooves of the piston 74, protrude slightly beyond them in the radial direction in relation to the infeed axis Z, in order to come into contact with the wall surface of the recess 100 in a sealing and sliding manner, and at the same time serve as sliding rings.

at his in 8th Finally, at the upper end, the latching element 62 has a cylindrical extension 124 which is pressed into a complementarily shaped frontal recess 126 of the armature 68 of the electromagnetic actuator 66 . Consequently the latching element 62 and the armature 68 are connected directly to one another, namely by means of a press fit at reference number 128 in 8th .

It is obvious to the person skilled in the art that with sufficient hydraulic loading of the effective surface 72 of the piston 74 via the pressure connection 110, the connecting channel 112 and the annular pressure chamber 108, the locking element 62 in 8th according to the double arrow Z in the recess 100 against the spring force of the spring 64 in the electromagnetic actuator 66 is raised. The pin-shaped end 106 of the latching element 62 is pulled back through the opening 104 in the housing 30 and is released from the latching contour 60 on the collar sleeve 98 of the piston 40, so that the locking of the piston 40 is released.

For further details of the electromagnetic actuator 66 is in particular to 2 , 4 , 7 , 8th and 10 referred. Accordingly, the electromagnetic actuator 66 initially has a substantially cup-shaped coil housing 130 which is flanged to the housing 30 of the parking lock module 10 from below. For this purpose, the coil housing 130 has a flange eye 132 on diametrically opposite sides with respect to its central axis (feed axis Z). When the electromagnetic actuator 66 is fastened to the housing 30 of the parking lock module 10, fastening screws 134 pass through the flange eyes 132 of the coil housing 130 and are inserted in threaded bushings (in the Figures not visible) screwed, which are embedded in the plastic material of the housing 30.

A coil 136 surrounding the armature 68 and cooperating with the armature 68 is accommodated in the coil housing 130--as is known for lifting magnets. The coil 136 is in the coil housing 130 by means of a in the 7 and 8th upper closing part 138 and a lower annular return plate 140 in these figures. The terminating part 138 and the yoke plate 140 are pressed into the coil housing 130 and ensure the required magnetic yoke of the magnetic drive formed. Furthermore, a bushing 142 is pressed into the return plate 140, which guides the essentially cylindrical armature 68. The bushing 142 protrudes slightly above the return plate 140 so that it can engage in the stepped recess 100 of the housing 30 in a centering manner, as shown in FIG 8th shown. A near the in 8th The annular collar 144 formed at the upper end of the armature 68 forms, with a mating surface on a plastic extrusion coating 146 of the coil 136, in the state of the electromagnetic actuator 66 not yet mounted on the housing 30 of the parking lock module 10, a captive safeguard for the armature 68.

In the 7 , 8th and 10 It can also be seen that the spring 64 acts on the armature 68 for preloading the latching element 62 and in this way is supported on the closing part 138 of the coil housing 130 . More specifically, according to in particular 8th the armature 68 and the end piece 138 are provided with opposing stepped bores 148, 150 which serve to receive the opposite ends of the spring 64. The spring 64 is a helical compression spring which is guided in the electromagnetic actuator 66 by means of a cylindrical guide pin 152 . In this case, the guide pin 152 is suitably fixed in the smaller-diameter bore section of the stepped bore 148 of the armature 68, for example pressed in. On the opposite side, the guide pin 152 is guided by means of a guide bushing 154 in the smaller-diameter bore section of the stepped bore 150 of the closing part 138 . The guide bushing 154 itself is pressed into the stepped bore 150 of the closing part 138 .

Those skilled in the art will, in turn, see that the latching element 62, which is firmly connected to the armature 68 of the electromagnetic actuator 66, can be raised against the force of the spring 64 accommodated in the coil housing 130 by suitably energizing the electromagnetic actuator 66, more precisely its coil 136, so that the pin-shaped end 106 of the locking element 62 of the collar sleeve 98 of the piston 40 in the housing 30 is released. Depending on the actuation state of parking lock 12, piston 40 of parking lock module 10 released - electromagnetically and/or hydraulically - by locking device 46 can now be moved from its unlocked position to its locked position by the spring force of piston spring 44 or by hydraulic loading of pressure chamber 48 in housing 30 be moved from its locked position to its unlocked position before it is fixed again in its respective position by means of the locking device 46 . For a defined latching position of latching element 62 of locking device 46 in housing 30, the bottom of recess 100 in housing 30, which is provided with opening 104, also forms a stop for latching element 62.

For further details of the electrical contacting of the electromagnetic actuator 66 of the locking device 46 and the position detector 56 of the sensor arrangement 54 with the aid of the common electrical interface 76 and the circuit board 78 is particularly on the 7 until 9 to refer.

Accordingly, the housing 30 of the parking lock module 10 is provided with a recess 156 for closely receiving the circuit board 78, which is rectangular when viewed in plan. The recess 156 for accommodating the circuit board 78 extends in its main direction of extent longitudinally to the piston 40, ie along the central axis M of the housing 30. The circuit board 78 accommodated in the recess 156 is aligned transversely to the infeed axis Z of the armature 68 of the electromagnetic actuator 66. The recess 156 for receiving the circuit board 78 is closed from the outside by means of a cover 158 . The cover 158, which is also made of a plastic material, is connected to the housing 30 of the parking lock module 10 at the reference number 160 in FIGS 2 , 4 and 9 tightly laser-welded all around.

According to in particular the 2 , 4 , 7 , 9 and 11 the common electrical interface 76 for the electromagnetic actuator 66 of the locking device 46 and the position detector 56 of the sensor arrangement 54 also has a plug-in connection 162 attached to the housing 30 of the parking lock module 10 . The plug connection 162 is aligned essentially transversely to the central axis M of the piston 40, along which the piston 40 in the housing 30 of the parking lock module 10 is longitudinally displaceable. In the exemplary embodiment shown, the plug connection 162 is formed on the cover 158 for the cutout 156 for receiving the circuit board 78 , more precisely formed in one piece with the cover 158 . Furthermore, the board 78 at reference numeral 164 in FIGS 9 and 11 secured to the cover 158 of the housing 30 in a suitable manner, e.g. by means of a mechanical clip connection or heat staking of fastening projections on the plastic cover 158.

Both the electromagnetic actuator 66 of the locking device 46 and the position detector 56 of the sensor arrangement 54 are connected to the electrical interface 76 via the circuit board 78 attached to the housing 30 . In this case, the electromagnetic actuator 66 of the locking device 46, more precisely its coil 136, is in contact with the circuit board 78 via contact pins 166 (to simplify the illustration, only one contact pin 166 is shown in the figures). The contact pins 166 are indicated at reference numeral 168 in FIGS 8th and 9 fixed in the circuit board 78 by means of a press-fit connection. For mechanical stabilization, the contact pins 166 of the electromagnetic actuator 66 are held in a shaft 172 of the housing 30 of the parking lock module 10 by means of a guide part 170 , which runs transversely to the recess 156 for accommodating the circuit board 78 .

As continues in the 7 and 9 is indicated, the plug-in connection 162 is provided with contact pins 174 for common contacting of the electromagnetic actuator 66 of the locking device 46 and the position detector 56 of the sensor arrangement 54, which are also connected by means of a press-fit connection 176 ( 9 ) are fixed in the circuit board 78. In 9 Finally, it is also shown that control electronics 178, known per se, for Hall element 90 of position detector 56, which are arranged and connected on circuit board 78, are also integrated in parking lock module 10. For the sensor arrangement 54, the circuit board 78 not only serves as a mechanical support for the position detector 56, but also ensures that the Hall element 90 of the position detector 56 is connected to the associated control electronics 178.

It is apparent to those skilled in the art that Hall element 90 of position detector 56, which is arranged on the side of circuit board 78 facing piston 40, is able to detect the position of position sensor 58 (magnet) embedded in piston 40 through the wall of plastic housing 30, see above that the respective actuation state of the parking lock module 10 can be detected via the sensor arrangement 54 . When installing the parking lock module 10 in the motor vehicle, the fitter only has to add a plug (not shown) to the plug-in connection 162 in order to make electrical contact with both the electromagnetic actuator 66 of the locking device 46 and with the position detector 56 of the sensor arrangement 54, i.e. for one To ensure complete electrical connection of the parking lock module 10 in the motor vehicle.

A parking lock module has a housing in which an actuator, which can be moved from a locked position to an unlocked position and vice versa, is accommodated in a longitudinally displaceable manner for actuating the parking lock. The actuator can be selectively fixed relative to the housing by means of a locking device, which has a latching contour fixed to the actuator and a latching element on the housing side. The locking element can be moved from a locking position, in which it engages with the locking contour, into a release position, in which it releases the locking contour, and vice versa. The locking element is also passively biased into the locking position by means of a spring and can be moved actively against the spring into the release position by means of an electromagnetic actuator with an armature that can be displaced along an infeed axis and/or a fluidic actuator with an active surface that can be pressurized. In a very compact design, the latching element is guided in a displaceable manner along the infeed axis, with the armature and the active surface being arranged coaxially with respect to the infeed axis.

Reference List

10

parking lock module

12

parking lock

14

parking lock wheel

16

gearing

18

pawl

20

pivot axis

22

locking tooth

24

drilling

26

actuator

28

conical surface section

30

Housing

32

operating mechanism

34

actuator

36

metallic backing plate

38

support section

40

actuator / piston

42

piston rod

44

piston spring

46

locking device

48

pressure room

50

piston rod spring

52

attack

54

sensor arrangement.

56

position detector

58

locator

60

locking contour

62

locking element

64

Feather

66

electromagnetic actuator

68

anchor

70

fluidic actuator

72

pressurizable active surface

74

Pistons

76

electrical interface

78

circuit board

80

mounting hole

82

Pressure piece

84

guide bush

86

lead extension

88

opening

90

Hall element

92

stop surface

94

counter surface

96

pressure connection

98

collar sleeve

100

recess

102

guide sleeve

104

breakthrough

106

pin end

108

annular pressure chamber

110

pressure connection

112

connecting channel

114

plastic stopper

116

deepening

118

sealing arrangement

120

sealing element

122

sealing element

124

cylindrical extension

126

recess

128

press fit

130

bobbin case

132

flange eye

134

mounting screw

136

Kitchen sink

138

final part

140

inference plate

142

Rifle

144

ring collar

146

plastic overmoulding

148

stepped bore

150

stepped bore

152

guide pin

154

guide bush

156

recess

158

lid

160

laser welding

162

plug connection

164

board mount

166

contact pin

168

Pressfit connection

170

guide part

172

shaft

174

contact pin

176

Pressfit connection

178

control electronics

E

unlock direction

M

Central axis / shift axis

S

blocking direction

Z

infeed axis

Claims (15)

Parking lock module (10) for actuating a parking lock (12) in a motor vehicle, with a housing (30) in which an actuator (40) for actuating the parking lock (12) is accommodated in a longitudinally displaceable manner, which can be moved from a locked position into an unlocked position and vice versa and can be selectively fixed relative to the housing (30) by means of a locking device (46), which has a latching contour (60) fixed to the actuator and a latching element (62) on the housing, which moves from a locking position in which it engages with the latching contour (60). located, can be moved into a release position in which it releases the latching contour (60), and vice versa, the latching element (62) being pretensioned into the locking position by means of a spring (64) and counter to the pretensioning by the spring (64) by means of a electromagnetic actuator (66) with an armature (68) that can be displaced along an infeed axis (Z) and/or a fluidic actuator (70) with an active surface that can be pressurized (72) can be moved into the release position, characterized in that the latching element (62) is guided in a displaceable manner along the infeed axis (Z), the armature (68) of the electromagnetic actuator (66) and the active surface (72) of the fluidic actuator ( 70) are arranged coaxially with respect to the infeed axis (Z). Parking lock module (10) after claim 1 , characterized in that the infeed axis (Z) extends substantially transversely to a displacement axis (M) of the actuator (40), along which the actuator (40) in the housing (30) of the parking lock module (10) is longitudinally displaceable. Parking lock module (10) after claim 1 or 2 , characterized in that the electromagnetic actuator (66) and the fluidic actuator (70) on the infeed axis (Z) are arranged one behind the other. Parking lock module (10) after claim 3 , characterized in that the fluidic actuator (70) with respect to the actuator (40) on the infeed axis (Z) in front of the electromagnetic actuator (66). Parking lock module (10) according to one of the preceding claims, characterized in that the spring (64) for prestressing the latching element (62) and the armature (68) of the electromagnetic actuator (66) are arranged coaxially with respect to the infeed axis (Z). Parking lock module (10) after claim 5 , characterized in that the spring (64) for biasing the latching element (62) and the armature (68) of the electromagnetic actuator (66) on the infeed axis (Z) are arranged one behind the other. Parking lock module (10) after claim 6 , characterized in that the armature (68) of the electromagnetic actuator (66) with respect to the actuator (40) on the infeed axis (Z) in front of the spring (64) for biasing the locking element (62). Parking lock module (10) according to one of the preceding claims, characterized in that the spring (64) for prestressing the latching element (62) is integrated in the electromagnetic actuator (66) of the locking device (46). Parking lock module (10) according to one of the preceding claims, characterized in that the spring (64) for preloading the latching element (62) is a helical compression spring. Parking lock module (10) according to one of the preceding claims, characterized in that the latching element (62) is formed as a piston (74) which forms the pressure-loadable effective surface (72) of the fluidic actuator (70). Parking lock module (10) according to one of the preceding claims, characterized in that the latching element (62) is guided in a recess (100) in the housing (30) of the parking lock module (10). Parking lock module (10) after claim 11 , characterized in that the locking element (62) is guided with the aid of a guide sleeve (102) in the recess (100) of the housing (30). Parking lock module (10) after claim 11 or 12 , characterized in that the locking element (62) and the recess (100) of the housing (30) are rotationally symmetrical about the infeed axis (Z). Parking lock module (10) according to one of Claims 11 until 13 , characterized in that the locking element (62) and the recess (100) of the housing (30) delimit an annular pressure chamber (108) via which the effective surface (72) of the fluidic actuator (70) can be pressurized, the annular pressure chamber ( 108) is sealed by means of a sealing arrangement (118) which has a sealing element (120, 122) on each side of the annular pressure chamber (108) viewed along the infeed axis (Z). Parking lock module (10) according to one of the preceding claims, characterized in that the latching element (62) and the armature (68) of the electromagnetic actuator (66) are connected to one another directly, in particular by means of a press fit (128).

Images