Parking brake actuator unit

Abstract

Parking lock actuator unit with a movement unit mounted in a receiving unit (21), which comprises a locking member (33) and a deflection member which can be brought into a locked locking position via a drive train and which is designed as a rotary member (32) driven in rotation via a rotary mechanism, wherein the rotary mechanism has a rotor shaft (22) and the rotary member (32) is coupled to the rotor shaft (22) in a rotational position which is fixed up to a predetermined rotational force relative to the rotor shaft (22), which is connected to a rotary drive (60), wherein the predetermined rotational force, up to which the rotational position of the rotary member (32) is fixed relative to the rotor shaft (22), is provided by a rotational force spring (35), and wherein a support member (31) is mounted on the rotor shaft (22) in a rotationally fixed manner, and the rotary member (32) is coupled to the rotor shaft (22) via the support member (31) and detachably connected to the support member (31) is connected. characterized by that the rotor shaft (22) is rotatably mounted in a housing-like receiving unit (21), that the carrier member (31) is disc-shaped with at least partially round contour and is arranged concentrically with respect to this on the rotor shaft (22) and that the support member (31) has a recess (310) which is open at the end and into which the rotary member (32) is inserted so as to be rotatable to a limited extent between two stops, on the one hand in and on the other hand against the tensioning direction of the torsion spring (35).

Description

[0001] The invention relates to a parking lock actuator unit with a movement unit mounted in a receiving unit, which comprises a locking member and a deflection member which can be brought into a locked locking position via a drive train and which is designed as a rotary member driven in rotation via a rotary mechanism, wherein the rotary mechanism has a rotor shaft and the rotary member is coupled to the rotor shaft in a rotational position which is fixed up to a predetermined rotational force relative to the rotor shaft, which is connected to a rotary drive, wherein the predetermined rotational force, up to which the rotational position of the rotary member is fixed relative to the rotor shaft, is provided by a torsional force spring and wherein a support member is mounted on the rotor shaft in a rotationally fixed manner and the rotary member is coupled to the rotor shaft via the support member and is detachably connected to the support member.

[0002] A parking lock actuator unit of this type is disclosed in DE 10 2010 027 826 A1. In this known parking lock actuator unit, a pawl is engaged with a locking gear by means of an actuating device to establish a locked position of a transmission and is moved into a released position to release it. A locking device provided with a latch is coupled to the actuating device. The latch is designed as a latch body pivotable about a pivot axis and preloaded in the locked position with a force acting in the locking direction. The latch is mounted on a shaft so that it can pivot to a limited extent relative to the shaft and is preloaded by a leg spring with a force acting in the locking direction.To move the parking lock from the release position to the locked position, the shaft is rotated in the locking direction, whereby a switching arm that is connected to the shaft in a rotationally fixed manner moves the bolt against an end piece of the pawl to engage the pawl with the locking gear. To release the parking lock, the shaft is rotated against the locking direction, whereby the bolt is inevitably pivoted via its extension and the switching arm in the opposite direction to the locking direction and moved out of engagement with the pawl. The pawl then moves under the action of a leg spring until it comes to a stop on a separate support body, which also serves to support the bolt on the side facing away from the pawl. To lock it in the locked and release positions, a locking arm that is connected to a shaft in a rotationally fixed manner cooperates with a spring lock.

[0003] DE 10 2012 017 817 A1 shows a parking lock arrangement in which an actuating device is designed to actuate the parking lock mechanism by rotation.

[0004] Furthermore, CN 1 02 678 916 A shows a parking lock actuator unit with a rotary mechanism and a pivotable locking member in the form of a pawl, which can be engaged in a parking lock gear.

[0005] Another such parking lock actuator unit is described in DE 697 07 779 T2. This unit, too, is used in vehicles with automatic transmissions to insert a locking element in the form of a pawl into a parking lock gear to lock it in a locked position when parked. The actuating mechanism for the locking element comprises a drive train with several pivoting and displaceable actuating elements, including a deflection element acting on the locking element. The design is adapted to the mechanical and geometric conditions of the environment, is relatively complex, and requires a relatively large amount of installation space.

[0006] Similar parking lock actuator units are also shown in DE 101 44 056 A1 and US 2012 / 0 018 259 A1.

[0007] The invention is based on the object of providing a parking lock actuator unit in a compact design.

[0008] This object is achieved in a parking lock actuator unit with the features of claim 1. Provision is made here for the rotary member to be coupled to the rotor shaft via the support member and to be detachably connected to the support member, for the rotor shaft to be rotatably mounted in a housing-like receiving unit, for the support member to be disc-shaped with a round contour at least in sections and to be arranged concentrically on the rotor shaft with respect thereto, and for the support member to have a recess into which the rotary member is inserted to be rotatable to a limited extent between two stops, one in the direction of the tension of the torsion spring and the other against it. These measures result in a compact, easy-to-assemble design with advantageous functionality.The functional advantage is achieved by ensuring that the rotational position of the rotary member relative to the rotor shaft remains fixed up to a predetermined torque, which is provided by the torque spring. If the torque provided by the torque spring is exceeded, the rotary member can rotate (to a limited extent) relative to the rotor shaft or the support member.

[0009] Contributing to an advantageous function are the measures that the rotating drive of the rotary member in the locked position direction is effected by the spring force of an engagement spring or by the rotary drive that also acts in the locked position direction or by another rotary drive, and counter to the locked position direction by the rotary drive. If the engagement spring is arranged in the drive train, for example, between the rotor shaft and the carrier member, the carrier member can be moved together with the rotary member to rotate in the locked position direction, whereas the carrier member (with the rotary member) is rotated counter to the locked position direction by means of the rotor shaft by the rotary drive.

[0010] For functional and structural purposes, it is further advantageous that, when the rotary member is detachably connected to the carrier member, the torsion spring is operatively installed between the rotary member and the rotor shaft. The torsion spring and the arrangement of the rotary member on the carrier member permit a limited rotational movement of the rotary member relative to the carrier member against the tensioning force of the torsion spring. Due to the limited possible rotational movement, the locking member can also rest on a tooth tip of the parking lock gear in the parking position towards the locking position and, in a subsequent rotational position of the parking lock gear, can snap into a corresponding tooth gap due to the pretension of the torsion spring in order to bring about the locking state.

[0011] Furthermore, the measures are advantageous for the function that a locking unit is provided for locking the locking position, which has at least one electrically and / or hydraulically operated actuator and a locking element operatively connected thereto, which engages in an engagement element arranged on a partial link of the drive train during locking and is movable from the engagement position to release the locking.

[0012] For the compact design it is advantageous that the partial link is the carrier link.

[0013] The measures that a further engagement element is arranged on the partial member, into which the locking element engages in a locking manner in a release position of the locking member, further contribute to an advantageous function.

[0014] The structure and function are further enhanced by the fact that the engagement element is / are designed as a first locking groove arranged in the support member and the optionally present further engagement element is / are designed as a second locking groove present in the support member.

[0015] A further advantageous design and function is that the locking element is designed as a locking lever pivotable about a pivot bearing, which can be moved toward the engaged position by means of a locking spring and can be moved to release the locking position by means of the electrically and / or hydraulically operated actuator. It is advantageous to detect one or both engagement positions using a sensor unit or position sensor to enable defined control measures.

[0016] A further advantageous embodiment is achieved in that the electrically operated actuator is / are designed as an unlocking member, which is moved by means of an electrically controlled lifting magnet, and the hydraulically operated actuator, if present, is / are designed as an unlocking piston of a hydraulic unit.

[0017] A further advantageous embodiment for the structure and function consists in that the rotary member has a cam-like protrusion with respect to its axis of rotation (which can correspond to the axis of the rotor shaft), which circumferentially slides and / or rolls against a facing circumferential surface section of the locking member or the locking pawl at least during a movement into the locking position and in the locking position, wherein the locking pawl is spring-biased in the direction opposite to the locking position by means of a pawl spring.

[0018] Further advantages for the design result from the fact that the carrier member is provided with the first and second locking grooves on the circumference.

[0019] The invention is explained in more detail below with reference to the drawings. They show: Fig. 1 a perspective view of a parking lock actuator unit engaging a parking lock gear, Fig. 2 a front view of the parking lock actuator unit and the parking lock gear in the locked position in a parking position, Fig. 3 the parking lock actuator unit in front view when releasing the locking position in a non-parking position in front view, Fig. 4 the parking lock actuator unit disengaged in a parking position in front view, Fig. 5 a schematic longitudinal sectional view of the parking lock actuator unit in the area of ​​a locking unit in the engaged position thereof and Fig. 6 the parking lock actuator unit Fig. 5 in a disengaged position of the locking unit.

[0020] Fig. 1 shows a perspective view of a parking lock device 1 with a parking lock actuator unit 2, wherein a locking member 33 designed as a pawl engages with a projection in a tooth gap of a parking lock gear 4, which is arranged on the transmission side in a vehicle.

[0021] The actuator unit 2 has a housing-like receiving unit 21 in which a movement unit with a rotor shaft 22 is rotatably mounted. The rotor shaft 22 protrudes from the receiving unit 21 at the end with a section on which a support member 31 is mounted in a rotationally fixed manner or with at least limited rotation by means of an engagement spring (not shown) for engaging the locking member 33. As an alternative to the engagement spring, a rotary drive acting in the corresponding direction can also be used. A rotary member 32 is inserted into a recess 310 of the support member 31 that is open at the end and is mounted in a rotationally fixed manner with respect to the support member 31 and thus also to the rotor shaft 22. The rotational strength relative to the rotor shaft 22 or to the support member 31 is adjusted up to a predetermined rotational force, which is provided by a rotational force spring 35.In the exemplary embodiment shown, the torsion spring 35 is helical and engages with one end region (not visible in the figure) on the rotary member 32 and with its other end section in the support member 31. When the rotary force provided by the torsion spring 35 is exceeded, the recess 310 allows a limited deflection of the rotary member 32 up to a first stop formed by a first limiting side of the recess 310 against the locking position direction R, whereas the rotary position of the rotary member 32 brought about by the rotary force of the torsion spring 35 is limited by means of a second stop which is formed by a second limiting side of the recess 310 that is spaced apart from the first limiting side, as will be explained below with reference to FIG. Fig. 2, Fig. 3 and Fig. 4 is illustrated.

[0022] How Fig. 1 and the Fig. 2, Fig. 3 and Fig. 4, the rotation of the rotary member 32 by means of the movement unit in the locking position direction R (cf. Fig. 2) an engagement of the locking member 33 with a projecting engagement portion into the parking lock gear 4 on the one hand, and by moving the rotary member 32 opposite to the locking position direction R, a disengagement of the locking member 33 with the engagement portion, a release of the locking position on the other hand, wherein the locking member 33 is moved by means of a release spring 34 from its engaged position or from the locking position. The interaction between the rotary member 32, which in the illustrated embodiment is designed as a cam-like projection, and the locking member 33, which in the exemplary embodiment is designed as a pawl, takes place by means of a circumferential actuating portion 320 of the rotary member 32, which slidingly bears against a facing circumferential surface portion of the locking member 33. As the Fig. 2 and Fig. 3, the rotary member 32 is brought into contact with the second stop of the recess 310 of the carrier member 31, acting in the direction of the locking position R, by means of the torsion spring 35, both in the parking position when the locking member 33 is engaged in the locking position and in the non-parking position in which the locking member 33 is brought into the release position. However, if the engaging portion of the locking member 33, as Fig. 4 shows, when engaging the parking position on a tooth tip of the parking lock gear 4, the rotary member 32 is deflected against the rotational force of the torsion spring 35, whereby the deflection path is then limited by the second stop formed in the recess 310. As can be seen from the Fig. 2 and Fig. 3 on the one hand and Fig. 4, on the other hand, the stop of the support member 31 or the recess 310 lying in the locking position direction R and the stop opposite to the locking position R are far enough apart to ensure that the engagement section rests securely on a tooth tip in the parking position. Upon further rotation of the parking lock gear 4, the locking member 33 then snaps securely into the engaged position and thus locked position as a result of the rotational force of the rotational force spring 35, which is greater than the force of the unlocking spring 34. The rotary member 32 is brought into the parking position by means of the movement unit, namely by means of the aforementioned engagement spring (not shown) arranged in the drive train, which also exceeds the force of the unlocking spring 34, or by means of another engagement or rotor force acting in the locking position direction R.Opposite the locking position direction R, the actuation takes place by means of a rotational force applied via a rotational mechanism of the movement unit, which is transmitted via a rotary drive 60 (cf. . Fig. 5) is provided, which is preferably electrically operated, but may alternatively be hydraulically operated, for example.

[0023] As the Fig. 1 to 4 further show, the support member 31 advantageously has a substantially circular cross-section and is disk-shaped and arranged concentrically to the rotor shaft 22. The recess 310, which extends radially outward from the center of the support member 31 and is open at the end, merges into a recess 311 towards the radial outside, into which the rotary member 32 projects, which with its actuating section 320 partially also projects beyond the circular circumferential contour of the support member 31, wherein the recess 311 does not extend over the entire axial depth of the support member 31 and is also open at the end. As can be seen from Fig. 3, the recess 311 contributes to a compact design in that the locking member 33, designed as a pawl, with its section facing the rotary member 32, passes through the recess 311 when pivoting between the non-parking position and the parking position. The pawl is pivotally mounted in its end section remote from the rotary member 32 in a pivot bearing 331, in the area of ​​which the release spring 34 is also arranged. The pivot bearing 331 can be fixedly mounted on the transmission side or be part of the actuator unit 2 (in this case, in particular, the receiving unit 21).

[0024] The actuator unit 2 is further provided with a locking unit 5 in order to maintain the parking position on the one hand and / or the non-parking position on the other hand. For this purpose, the locking unit 5, as can be seen from the Fig. 5 and Fig. 6, a locking element 51 which engages in the drive train in at least one of the two positions in a respective engagement element and is movable from the engagement position to release the locking. Fig. 5 for the parking position, the engagement element in the embodiment shown is arranged in the carrier member 31 and is designed as a first locking groove 312. For the non-parking position, the respective engagement element, as is particularly the case with the Fig. 3 shows, is designed as a second locking groove 313 in the support member 31. The locking element 51 is designed, for example, as a locking lever and is pivotally mounted in a pivot bearing 52 that is fixed relative to the housing 2. On one leg of the locking lever, specifically, for example, on the leg facing away from the support member 31, the locking lever is supported by means of a locking spring 53 in order to hold the locking lever or the locking element 51 in the position that effects the locking. To release the locking, an electrically operated lifting magnet 50 is provided, which acts on the locking lever with an unlocking member 501 against the spring force of the locking spring 53. Alternatively or additionally (redundantly) to the lifting magnet 50, a hydraulically operated unlocking piston 54 is effective on one leg of the locking lever or the locking element 51, which e.g. B. is supplied with hydraulic fluid from a servo system.By releasing the locking mechanism, the locking is released and the rotation of the rotary member 32 is enabled, so that the locking member 33 can be brought into or out of the locking position.

[0025] For the defined actuation of the locking element 51 and for release by the lifting magnet 50 or the unlocking piston 54, a position sensor is advantageously arranged in the drive train, which detects the at least one engagement position of the locking element 51 during locking, so that the release can be effected by controlling the lifting magnet 50 or the unlocking piston 54 by means of a control device (not shown) which receives a sensor signal from the position sensor, by emitting a control signal. Fig. 6 shows the respective release position of the locking element 51.

[0026] To rotate the rotary member 32, a rotary drive 60 acts in the drive train, which is designed, for example, as an electric motor or hydraulic drive acting in one or two directions. For example, the rotary drive 60 acts on the rotor shaft 22 directly or via at least one gear member. The rotary drive 60 can also be designed as a drive that can be controlled in two directions, i.e., can operate (acting) in two directions of rotation. Both drive types, electric and hydraulic, can also be provided redundantly to one another. The rotating drive can be implemented via suitable gear members of the movement unit, such as gears and / or pivoting levers, or via a conversion unit from a linear drive to a rotating drive.

[0027] The engagement spring (not shown) for effecting the locking position is arranged at a suitable location in the drive train, wherein an embodiment can be designed such that the engagement spring engages the support member 31 relative to the housing 2 in order to act upon the rotary member 32 in the locking position direction R. The movement opposite to the locking position direction takes place via the rotor shaft by means of the rotary drive 60, whereby the support member 31 is also moved accordingly.

Claims

[1] Parking lock actuator unit with a movement unit mounted in a receiving unit (21), which comprises a locking member (33) and a deflection member which can be brought into a locked blocking position via a drive train, which is designed as a rotary member (32) driven in rotation via a rotary mechanism, wherein the rotary mechanism has a rotor shaft (22) and the rotary member (32) is coupled to the rotor shaft (22) in a rotational position which is fixed up to a predetermined rotational force, which is connected to a rotary drive (60), wherein the predetermined rotational force, up to which the rotational position of the rotary member (32) is fixed relative to the rotor shaft (22), is given by a rotational force spring (35), and wherein a carrier member (31) is mounted on the rotor shaft (22) in a rotationally fixed manner, and the rotary member (32) is coupled to the rotor shaft (22) via the carrier member (31) and detachably connected to the carrier member (31). characterized by , that the rotor shaft (22) is rotatably mounted in a housing-like receiving unit (21), that the carrier member (31) is disc-shaped with at least partially round contour and is arranged concentrically with respect to this on the rotor shaft (22) and that the support member (31) has a recess (310) which is open at the end and into which the rotary member (32) is inserted so as to be rotatable to a limited extent between two stops, on the one hand in and on the other hand against the tensioning direction of the torsion spring (35). [2] Actuator unit according to claim 1, characterized by that when the connection of the rotary member (32) to the support member (31) is released, the torsion spring (35) is operatively installed between the rotary member (32) and the rotor shaft (22). [3] Actuator unit according to one of the preceding claims, characterized bythat the rotating drive of the rotary member (32) in the locking position direction (R) is effected by means of the spring force of an engagement spring or by means of the rotary drive (60) which also acts in the locking position direction or by means of a further rotary drive and against the locking position direction by means of the rotary drive (60). [4] Actuator unit according to one of the preceding claims, characterized by in that a locking unit (5) is provided for locking the blocking position, which has at least one electrically and / or hydraulically operated actuator and a locking element (51) operatively connected thereto, which engages in an engagement element arranged on a partial member of the drive train during locking and is movable from the engagement position to release the locking. [5] Actuator unit according to claim 4, characterized by that the partial member is the carrier member (31). [6] Actuator unit according to claim 4 or 5, characterized bythat a further engagement element is arranged on the partial member, into which the locking element (51) engages in a locking manner in a release position of the locking member (33). [7] Actuator unit according to one of claims 4 to 6, characterized by that the engagement element is / are designed as a first locking groove (312) arranged in the carrier member (31) and the optionally present further engagement element is / are designed as a second locking groove (313) present in the carrier member (31). [8] Actuator unit according to one of claims 4 to 7, characterized by that the locking element (51) is designed as a locking lever which can be pivoted about a pivot bearing (52) and which can be moved in the direction of the engagement position by means of a locking spring (53) and can be moved to release the locking by means of the electrically and / or hydraulically operated actuator. [9] Actuator unit according to one of claims 4 to 8, characterized bythat the electrically operated actuator is designed as an unlocking member (501) which is moved by means of an electrically controlled lifting magnet, and the hydraulically operated actuator, if present, is designed as an unlocking piston (54) of a hydraulic unit. [10] Actuator unit according to one of the preceding claims, characterized by in that the rotary member (32) has a cam-like projection with respect to its axis of rotation, which circumferentially slides or rolls against a facing circumferential surface section of the locking member (33) at least during its movement into the locking position and in the locking position, wherein the locking member (33) is spring-biased in the direction opposite to the locking position by means of an unlocking spring (34). [11] Actuator unit according to one of claims 7 to 10, characterized by that the carrier member (31) is provided circumferentially with the first and second locking grooves (312, 313).

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