WO2018091024A1

WO2018091024A1 - Gear mechanism arrangement having a locking function

Info

Publication number: WO2018091024A1
Application number: PCT/DE2017/100867
Authority: WO
Inventors: Daniel Faber; Benjamin Wübbolt-Gorbatenko; Harald Hochmuth; Jochen Rosenfeld; Hartmut Krehmer
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2016-11-18
Filing date: 2017-10-12
Publication date: 2018-05-24
Also published as: DE102016222715A1

Abstract

Spur gear mechanism stages as parts of gear mechanisms usually have two spur gearwheels which are in engagement with one another, wherein one of the spur gearwheels forms a drive and the other spur gearwheel forms an output. It is possible in this way firstly to step up or to step down a prevailing torque and/or to transmit the torque 1:1. In many applications, however, a permanent transmission, for example in the sense of an endless rotation of the output, is not provided; rather, gear mechanisms of this type serve as stepping gear mechanisms, wherein an actuating movement is introduced via the drive and is transmitted via the output to an actuating element, in order that the latter assumes an actuating position. A gear mechanism arrangement (1) is proposed, having a drive gear (2) which is arranged such that it can be rotated about a drive axis (6), and which has a drive toothing section (8a, b) in the circulating direction, having an output part which has an output toothing section (15), wherein the drive toothing section (8a, b) and the output toothing section (15) can be brought into engagement with one another by way of a rotation of the drive gear (2), with the result that the gear mechanism arrangement (1) is in a drive state, wherein the drive gear (2) has a drive locking section (9a, b) and the output part has an output locking section (13a, b), wherein the drive locking section (9a, b) and the output locking section (13a, b) can be brought into engagement with one another by way of a further rotation of the drive gear (2), with the result that the gear mechanism arrangement (1) is in a locking state, wherein the output part is configured as a linear rail (3).

Description

Gear arrangement with blocking function

The invention relates to a gear arrangement with blocking function with a drive wheel, which is arranged rotatably about a drive shaft and which has a drive gear section in the circumferential direction, with a driven part, which has a driven gear portion, wherein the drive gear portion and the driven gear portion engageable with each other by a rotation of the drive wheel are such that the gear assembly is in a drive state, wherein the drive wheel has a drive and the driven portion Entreibssperrabschnitt, the drive and the output cut-off section are engageable by a further rotation of the drive wheel with each other, so that the gear assembly is in a locked state.

Spur gear stages as parts of gears usually have two spur gears, which are engaged with each other, wherein one of the spur gears forms a drive and the other spur gear an output. In this way, it is possible to translate on the one hand an applied torque or to undercut and / or to transmit the torque 1: 1. In some applications, however, a permanent transmission, for example in the sense of an endless rotation of the output is not provided, but rather serve such gear as a step gear, wherein via the drive an actuating movement introduced and transmitted via the output to an actuator, so that it occupies a parking position. As soon as the adjusting movement has taken place, the gear should hold the setting position. For example, brakes which frictionally secure the transmission, or locking elements such as detent contours or pin locks, which secure the gear in a form-fitting manner, can be used to hold the adjusting position. In addition, externally controlled pneumatic, hydraulic or electric locks are used. Another approach is taken by document DE 10 2014 209 939 A1, which forms the closest prior art. In this document, a gear arrangement is proposed for a spur gear, which is brought by a rotation of the drive wheel alternately in a drive state and in a locked state.

It is an object of the invention to propose a further development for a gear arrangement with a blocking function. This object is achieved by a gear arrangement with the features of claim 1. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

In the context of the invention, a transmission arrangement is proposed, which is designed for transmitting an adjusting movement and for implementing a blocking function. The gear arrangement is formed in a preferred embodiment as an electromechanical actuator, in particular as an electric motor driven linear drive, and comprises in this preferred embodiment, an electric motor for driving the adjusting movement. Optionally, the gear arrangement may have further gearboxes as pre-translation after the electric motor and / or before the linear drive.

The gear arrangement has a drive wheel, which is arranged rotatably about a drive axis. In particular, the drive wheel is at least directly operatively connected to the electric motor or operatively connected, so that a drive torque of the electric motor can be transmitted to the drive wheel. The drive wheel is formed with a drive toothing section in the direction of rotation about the drive axis with a drive toothing, wherein the drive toothed section preferably has radially outwardly facing drive teeth as the drive toothing. The drive wheel is in the drive toothing section particularly preferably circular and / or formed as a spur gear. In particular, the drive toothing of the drive toothing section is arranged on a first pitch circle radius. In addition, the gear assembly includes a driven part The driven part has at least partially on a driven gear teeth with output teeth. The output gear is at least partially arranged in one or more output gear section or sections.

The drive gear section and the driven gear section can be brought together by a rotation of the drive wheel in a particular meshing engagement. The gear assembly is in a drive state when the output gear portion and the drive gear portion mesh with each other and / or engage with each other.

The drive wheel also has a drive locking section in the direction of rotation and the driven part has at least one driven-off section. The drive-locking portion and the driven-off portion can be engaged with each other by further rotation or further rotation of the drive wheel from the driving state, so that the gear assembly is in a locked state. In particular, in the locked state of the gear arrangement, the drive-locking section and the driven-off section form a positive locking device, in particular for the driven part, in particular only for the driven part, wherein the drive wheel remains permanently rotatable.

In particular, the gear assembly is formed so that upon rotation of the drive wheel in a rotational direction, first the drive state is assumed, wherein the drive gear portion and the output gear portion are engaged and the drive wheel drives the driven part. In a further rotation of the drive wheel of the drive and the Abtriebssperrabschnitt be brought into operative connection, so that the gear assembly is in the locked state. In particular, it is provided that during a rotation, in particular during an endless rotation, of the drive wheel in one direction of rotation Gear arrangement is alternately in the drive state and the lock state can be brought.

It is thus achieved that the gear arrangement alternately transmits an actuating movement in the drive state and converts in the locked state, in particular a positive locking safety device. Depending on the number of drive gear sections and drive locking sections on the drive wheel and driven gear sections and output sections on the driven part a stepwise adjustment of the driven part with a freely selectable number of stages and at the same time a form-locking standstill between stages is implemented.

In particular, a positive rotation is realized, which requires no further actuator, no further control device or energy for standstill.

In the context of the invention, it is proposed that the output part is designed as a linear rail. The output gear portion extends as an output gear along the linear rail. The output cut-off sections or those are lined up along the longitudinal extent of the linear rail. In particular, the gear arrangement is designed as a self-locking linear gear and / or a self-locking linear axis. The transition from a rotary gearbox to a linear gearbox extends the range of applications.

In a preferred constructional realization of the invention, the drive state is canceled in the locked state. Upon rotation of the drive wheel in the locked state, therefore, the driven member is not displaced relative to the drive wheel but remains stationary relative to the drive wheel. In other words, the transmission ratio in the locked state from the drive wheel to the driven part is infinitely large, since an angle change of the rotational angle of the drive wheel does not lead to a translation of the driven part. In a preferred embodiment of the invention, the drive-locking section is formed in an axial plan view as a positive contour, in particular a convex contour, and the driven-off section as a negative contour, in particular a concave contour. The positive contour takes in a preferred embodiment of the invention in the axial plan view with respect to the drive axis a circular arc-shaped active contour whose center is defined by the drive axis and its radius by the distance to the drive axis. In contrast, the output contour is formed in the axial plan view with respect to the drive axis as a circular arc-shaped counteracting contour, wherein the center lies on a circle around the drive axis in the locked state, and wherein the radius is formed by the distance to the drive axle in the locked state.

Thus, in the blocking state, the circular-arc-shaped active contour lies in the circular-arc-shaped counteracting contour, wherein the radius of the circular arc-shaped counteracting contour is equal to or greater than the radius of the circular arc-shaped active contour. Now, if the drive wheel is rotated about the drive axis, so the positive contour rotates in the negative contour, without taking the driven part. The transmission of a translational movement of the driven gear on the drive part is locked in the locked state and / or impossible.

In a preferred structural embodiment of the invention, the gear arrangement forms a toothed differential gear and axially offset to a Sperruntergetriebe. The gear sub-transmission includes the drive gear portion and the output gear portion and the ratchet gear, the drive gear portion and the output cut-off portion. Particularly preferably, the toothed under gear and the locking lower gear are arranged offset in the axial direction parallel to each other. In this embodiment, the functions "drive-locks" are separated from each other axially and thus decoupled. In particular, in a further development of this constructive embodiment, it is preferred that in an axial plan view of the drive wheel, the drive toothing section extend over a drive toothing angle and the drive cut section via a drive locking angle in the circumferential direction about the drive axis.

In principle, the gear arrangement can have exactly one drive toothing section and / or exactly one drive cut section. In a preferred embodiment of the invention, the drive wheel has at least or exactly two drive gear sections and / or at least or exactly two drive block sections. Thus, at least or exactly twice the drive state and at least or exactly twice the locked state per revolution of the drive wheel.

In a preferred development of the invention, the drive teeth sections are arranged between the drive block sections relative to the axial extension of the drive axle, in particular so that these engage around the drive tooth sections on both sides or in the manner of a bracket. Alternatively or additionally, based on the axial extent of the drive axle, the output gear sections are arranged between the output cut-off sections, in particular so that these engage around the output gear sections on both sides or in the manner of a clip. For example, control ribs can be arranged on both sides of the output gear sections, on which the output gear sections are arranged. Thus, two Sperruntergetriebe are formed by the Abtriebssperrabschnitte and the drive locking. Preferably, the output cut-off portions of the two locking lower gear are arranged offset to one another in the longitudinal extension to the linear rail, so that alternately sets the one and subsequently the other locking lower gear the blocking state.

It is preferred that the output part has a plurality of output cut-off sections. The number of multiple output cutoff sections corresponds to the number of stages of possible positive locking shutdown in the longitudinal extent of the linear rail. In an axial plan view with respect to the drive axis, the output cut-off sections are offset in the longitudinal extension in each case by a developed drive tooth angle, so that the output cut sections are separated from one another in the longitudinal direction.

The output gear sections may be formed as subsections, but it is also possible that the output member has a continuous in the longitudinal direction of the output gear, which form the plurality of output gear sections.

It is envisaged that the number of teeth of the drive gear portion is tuned to the number of teeth of one of the output gear portions, so that the drive and driven part are forced to each other, wherein the positive guide is designed so that upon rotation of the drive wheel of the gear assembly inevitably alternately Locked state and the drive state are taken.

In a preferred implementation of the invention, the gear assembly is designed as an electromechanical actuator, e.g. for actuators or actuation and locking units for linear movements, as they occur at various points in motor vehicles. These concern in particular:

- Door opener and door closer with integrated parking brake for vehicle doors incl. Hinged doors (positioning and locking mechanisms)

- Positioning and locking mechanisms for sliding, lifting and tilting roofs

- Positioning and locking mechanisms for spoiler constructions

- Locking and locking mechanisms for grille shutter

- Locking mechanism for holding a specific door or flap position Further features, advantages and effects of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. Showing:

Figure 1 is a schematic, three-dimensional representation of a gear arrangement as an embodiment of the invention in a locked state;

Figure 2 is a schematic, three-dimensional representation of the gear assembly of Figure 1 in an operating condition;

Figure 3 is a schematic, three-dimensional representation of the gear arrangement of Figure 1 in a further blocking state;

Figure 4 is a schematic, three-dimensional representation of the gear assembly of Figure 1 in a further operating condition.

FIG. 1 shows, in a schematic three-dimensional representation, a gear arrangement 1 as an exemplary embodiment of the invention. The gear arrangement 1 has a drive wheel 2 and an output part, which is designed as a linear rail 3, on. The drive wheel 2 is for example connected to an electric motor 4, not shown, the linear rail 3 is in a manner not shown, for example. connected to a locking mechanism 5.

In this embodiment, the gear assembly 1 forms an electromotive actuator, which is used, for example, to implement an actuating movement in an automatic door closer or door opener.

The drive wheel 2 is rotatable about a drive axis 6, the linear rail 3 along a linear direction 7 arranged translationally or linearly displaceable. In a projection from above, the drive shaft 6 intersects the linear direction 7 at right angles. The drive wheel 2 comprises two drive gear sections 8 a, b, in each of which a drive toothing is arranged with radially outwardly facing teeth. The drive teeth sections 8 a, b do not extend fully around the drive axle 6, but are limited to a drive tooth angle, which occupies about 60 degrees in the present example. The drive gear portions 9a, b are arranged offset from each other by 180 degrees.

Further, the drive wheel 2 on each axial side of a drive locking portion 9 a, b, which occupy a drive locking angle in each case in the direction of rotation. The drive-locking sections 9a, b are offset relative to one another and to the drive-toothed sections 8a, b.

The drive locking sections 9 are each formed as a positive contour and each have on the radial outer sides of a circular arc-shaped active contour 10a, b, which is coaxial and concentric with the drive axis 6, wherein the radius of the circular arc-shaped active contour 10a, b corresponds to the distance to the drive axle 6 , The active contour 10 a, b is in each case formed as a flat material section, in particular as a sheet metal and / or metal and / or sintered section with a part-circular outer contour.

The drive gear sections 8a, b and the drive block sections 9a, b are arranged axially offset relative to one another in the axial direction relative to the drive axle 6. In particular, the drive teeth sections 8a, b are arranged between the drive block sections 9a, b.

The linear rail 3 has an output gear portion 15 which is formed as a continuous output gear 1 1 with pointing in the direction of the drive wheel 2 output teeth. Further, the linear rail 3 comprises on each side of the output gear 1 1 a starboard 12 a, b, which is formed in this example as rails. The Steuerborde 12 a, b are arranged parallel to the output gear 1 1. In the drive wheel 2 facing edge region of the control cords 12 a, b are output cut sections 13 a, b introduced as negative contours, which are formed as a circular arc counteracting contours 14 a, b and / or edge-side arcuate Aussparrungen in the tax bills 12 a, b as a carrier and spaced apart from each other in the linear direction 7.

Steuerborde 12 a, b and driven teeth 1 1 are arranged offset from one another in the axial direction to the output shaft 7. Drive gear 2 and linear rail 3 are matched to each other, so that the drive gear portions 8a, b can mesh with the output gear 1 1 and forms a toothed gear and the drive block sections 9 a, b can engage in the output cut sections 13 a, b and forms a Sperruntergetriebe.

Thus, the gear assembly 1 forms a possible embodiment of a self-locking gear with integrated adjustment and locking unit. The transmission consists of a drive wheel 2 and a linear output part, which is designed as the linear rail 3. The linear output member has arranged centrally the continuous internal toothing as the output toothing 1 1 as it is e.g. is known by racks. Left and right thereof two identically formed blocking contours are formed as tax aries 12 a, b arranged. These blocking contours each have circular arc-shaped recesses as output cut-off sections 13 a, b, which are arranged at a certain distance from each other. Both blocking contours are arranged offset to each other by exactly half the distance of these recesses in the embodiment shown.

The drive wheel 2 has centrally a front toothing as a drive toothed portion which engages in the mounted position in the continuous center mounted on the linear output member output gear 1 1 and thus ensures the drive ratio. This radial external toothing is formed only as a partial toothing, so that the toothing limited only to a certain area. This results in addition to the gearing itself as well a certain untoothed portion on the outside of the drive wheel 2. Left and right of this partially toothed area - as well as the linear output part - the two locking contours as the drive locking portions 9a, b attached. These are exactly designed so that they can engage in the circular arc-shaped recesses on the linear output part. Both locking contours (left / right side) are identical and in the example shown mounted offset by 180 °. Other versions are however also conceivable.

By this special arrangement of drive and locking contours now results in a linear actuator that works analogous to a stepper: Combines the drive during the drive phase or in the drive state with its teeth in the rack or output gear 1 1 of the linear output member, so Thus, a linear positioning movement can be achieved, as it is known from a classic rack.

However, the locking contour of the drive wheel 2 meshes in the corresponding recesses on the locking contours of the linear output member, so the gear assembly 1 is in the locked state, and there is no linear output movement instead. However, since the untoothed portion of the output gear is positioned exactly so that engage in this period, no teeth of the drive in the rack, despite locked linear motion, the drive wheel continues to be rotated. This ensures that a drive phase is reached again after each lock phase.

This state is shown in FIG. 1, in which the radial locking contour attached to the drive wheel 2 meshes exactly as the drive locking section 9a in the linear blocking contour attached to the linear output part as the output locking section 13a. Thus, the gear assembly 1 is locked, there is no transmission.

Thus, in the figure 1, the gear assembly 1 is shown in the locked state, wherein the drive locking portion 9a is in engagement with one of the output locking portions 13a. Thus, the gear assembly 1 is positively locked, with a small pivoting movement about the drive shaft 6 to no displacement of the linear rail 3 relative to the drive wheel 2 leads. In particular, the active contour 10a engages positively in the counteracting contour 14a. The drive gear sections 8a, b are disengaged from the output gear 11.

After a certain angle of rotation, the locking contours of the drive wheel 2 mesh out of the corresponding recesses on the linear output part. The toothing comprising only a specific section of the drive wheel 2 is aligned with respect to the associated blocking contours so that this (partial) toothing meshes with the output toothing I l of the linear output part exactly at the time when the blocking contours no longer interlock positively with one another , Thus, the transmission assembly 1 is now in the transmission phase or in the drive state. This state is shown in FIG. 2, wherein in the drive state the drive toothed section 8a engages the output toothing 11. The drive block sections 9a, b are disengaged from the output block sections 13a, b.

As can be seen in particular from FIG. 3, at the end of this transmission phase, one of the locking contours on the drive wheel 2 again engages in a corresponding recess on the linear driven part, at the same time the partial toothing on the drive wheel 2 has to be combed out of the output toothing 11 of the linear driven part , whereby the transmission movement is terminated and the transmission assembly 1 is again in the locked state. In the blocking state, the other drive locking section 9b thus engages in the output locking section 13b on the other side of the linear rail 3. The drive gear sections 8a, b are disengaged from the output gear 11.

Ultimately, this always results in a mutual operation of drive phase or - state and lock phase or state, resulting in a continuous rotation of the drive wheel 2, a stepwise linear movement of the output part. FIG. 4 shows the gear arrangement in the adjoining movement phase, wherein engages in the drive state of the drive gear portion 8b in the output gear 1 1. The drive block sections 9a, b are disengaged from the output block sections 13a, b.

LIST OF REFERENCE NUMBERS

transmission assembly

drive wheel

linear rail

electric motor

locking mechanism

drive axle

linear direction

a, b Antriebsverzahnungsabschnitta, b drive block section

0a, b active contour

1 gearing / driven gearing2a, b Steuerborde

3a, b output cut section

4a, b counteracting contour

5 output gear section

Claims

claims

1 . Gear arrangement (1) with a drive wheel (2), which is arranged rotatably about a drive axle (6) and which has a drive gear section (8a, b) in the direction of rotation, with a driven part, which has an output gear section (15), wherein the drive gear section (15) 8a, b) and the driven gear portion (15) are engageable with each other by rotation of the drive wheel (2) so that the gear assembly (1) is in a driving state, the drive wheel (2) having a drive locking portion (9a, b) and the driven part has an output blocking portion (13a, b), wherein the drive locking portion (9a, b) and the driven locking portion (13a, b) are engageable with each other by further rotation of the driving wheel (2) so that the gear assembly (1) is engaged with a blocking state, characterized in that the output part is formed as a linear rail (3).

2. Gear arrangement (1) according to claim 1, characterized in that upon rotation of the drive wheel (2) the gear arrangement (1) can be brought alternately into the drive state and the blocking state.

3. Gear arrangement (1) according to claim 1 or 2, characterized in that the drive state is canceled in the locked state, so that in the locked state upon rotation of the drive wheel (2), the linear rail (3) relative to the drive wheel remains stationary and / or that in the locked state, the transmission ratio of the drive wheel (2) to the linear rail (3) is infinitely large.

4. gear arrangement (1) according to one of the preceding claims, characterized in that the drive locking portion (9a, b) as a convex contour and the driven-off cut-off portion (13a, b) is formed as a concave contour.

5. gear arrangement (1) according to claim 4, characterized in that the convex contour in the axial plan view of a circular arc-shaped active contour (10 a, b), wherein the center of the circular arc-shaped active contour (10 a, b) by the drive axis (6) and the Radius of the circular arc-shaped active contour (10a, b) is defined by the distance to the drive axle (6).

6. gear arrangement (1) according to claim 5, characterized in that the concave contour in the axial plan view of a circular arc-shaped counter-acting contour

(14a, b), wherein the center of the circular arc-shaped counteracting contour (14a, b) lies in the blocking state on a circle about the drive axis (6) and the radius of the circular arc counteracting contour (4) in the blocking state by the distance to the drive axis (6 ) is defined.

7. Gear arrangement (1) according to one of the preceding claims, characterized in that the gear arrangement (1) viewed in the axial direction, a toothed differential gear and axially offset forms a Sperruntergetriebe, wherein the Verzahnungsuntergetriebe the Antriebsverzahnungsabschnitt (8 a, b) and the output gear portion (15 ) and the locking lower gear, the drive-locking portion (9a, b) and the driven-off cut-off portion (13a, b).

8. gear arrangement (1) according to any one of the preceding claims, characterized in that the drive wheel (2) at least or exactly two drive gear sections (8 a, b) and / or at least or exactly two drive locking portions (9 a, b) has.

9. gear arrangement (1) according to claim 8, characterized in that the Antriebsverzahnungsabschnitte (8a, b) disposed between the drive-locking portions (9a, b), and / or the Abtriebsverzahnungsabschnitte (15) between the Abtriebssperrabschnitten (13a, b) are arranged.

10. Gear arrangement (1) according to one of the preceding claims, characterized in that it is designed as an electromechanical actuator with an electric motor (4).