Locking sleeve for an actuator

Abstract

A locking sleeve 4 having two half shells 8a,b pivotable between open position and closed position, for locking the position of a linear actuator 1. Locking grooves of the shells may engage webs 7a,b

Description

The present invention relates to a locking device, preferably a locking sleeve, for a linear actuating apparatus, for example an actuator. If an actuator, for example a spoiler actuator, fails during flight, flight operations cannot be continued safely unless the actuator is blocked or locked. Against this background, the object underlying the present invention is to mitigate or even completely eliminate the problems of the prior art. The object underlying the present invention in particular is to provide a device for blocking or locking an actuator, for example a spoiler actuator of an aircraft, in order to be able to continue flight operations in the event of an actuator failure until favorable conditions for actuator repair are present. This object is achieved by means of a device and a system according to the independent claims. Advantageous developments of the invention are the subjectmatter of the dependent claims. Accordingly, a device for locking an actuator, preferably a locking sleeve, is provided, comprising two half-shells that are pivotable relative to one another between an open position and a locking position, which are configured in such a way that, in the locking position, the two half-shells are in abutment with each other at their end faces facing each other. The two half-shells are preferably connected to each other at one end via a hinge so that they are pivotable. At the end opposite the hinge, the half-shells are also preferably in contact in the locking position. In contrast to conventional solutions with a bayonet lock, the two half-shells thus preferably form a closed hollow cylinder in the locking position. This also allows full threaded engagement between the device and a housing of the actuator. In contrast to conventional solutions, a solution according to the invention does not have a bayonet lock, but preferably a web-and-groove connection. The device may comprise at least one fixing element by means of which the half-shells can be fixed to each other in the locking position, wherein the fixing element is preferably configured in the form of at least one screw which penetrates a partial region of one half-shell and can be screwed into a partial region of the other half-shell. According to an embodiment, the fixing element may comprise at least two screws which are configured to hold the two half-shells in abutment at their end faces facing each other. Furthermore, the device may comprise a thread at least at one longitudinal-side end, which is configured to engage with a further component, preferably an actuator, in order to hold the device releasably to the component. Furthermore, the device may comprise an anti-rotation means comprising at least one preloaded latch configured to engage in a corresponding recess in a housing in order to prevent the device from twisting relative to the housing. The at least one latch may be configured in the form of a spring-loaded ball which is adapted to enter a corresponding groove in the housing. The anti-rotation means may further comprise at least one bushing, in which the ball is guided, wherein the bushing is configured such that it allows the ball to move with and against the spring force. Another aspect of the invention relates to a linear actuating apparatus, preferably an actuator, with a housing, wherein the housing comprises a thread which is configured to engage with a corresponding thread of a device according to the present invention. The housing of the actuating apparatus can be equipped with at least one, preferably multiple radially extending grooves on an end face which is configured to come into contact with the device according to the present invention. A ball of an anti-rotation means of the device can enter and / or cross the grooves. Another aspect of the invention relates to a system with a linear actuating apparatus according to the present invention and a device according to the present invention, wherein the device is in releasable engagement with the housing of the actuating apparatus by means of a threaded engagement at one of its longitudinal-side ends and preferably at least one latch or ball of the anti-rotation means of the device is in engagement with a groove of the housing. Another aspect of the invention relates to the use of a device according to the present invention and / or a system according to the present invention for manufacturing and / or equipping of an aircraft, in particular an airplane. Furthermore, the invention comprises an aircraft, in particular an airplane, comprising at least one device according to the present invention and / or a system according to the present invention. Another aspect of the present invention relates to a method for manufacturing and / or equipping an aircraft, in particular an airplane, comprising the step of: placing at least one device according to the present invention and / or a system according to the present invention on the aircraft, preferably on an actuator thereof. It should be noted at this point that all features disclosed in the context of a particular embodiment in the present application are also included in any other combinations or even in isolation from the disclosure, although explicit disclosure has been omitted herein for reasons of avoiding redundancy. All features of the invention described herein may therefore be claimed in any combination with each other or isolated from each other. It should also be noted that the terms “one” and “a” do not necessarily refer to exactly one of the elements, although this is a possible configuration, but may also refer to a plurality of elements. Similarly, the use of the plural also includes the presence of the element in question in the singular, and conversely, the singular also includes multiple of the elements in question. Further details and advantages of the invention are explained in more detail with reference to an exemplary embodiment shown in the drawings. The Figures show in: Fig. 1: a view of an actuator with a locking sleeve according to the invention, Fig. 2: a detailed view of a section from Fig. 1, Fig. 3: a sectional view of a locking mechanism of the locking sleeve from Fig. 1, and Fig. 4: a perspective view of the locking sleeve from Fig. 1 in the open position. Fig. 1 shows a linear actuating apparatus 1, e.g. a hydraulic cylinder, with a fixed eye 2 and a linearly movable eye 3. A device 4 according to an embodiment of the invention is shown, which locks the position of the movable eye 3 relative to the fixed eye 2 in both directions of movement in a form-fitting manner. Locking is achieved by connecting the device 4 to the housing 6 by means of the thread 5, and to the eye 3 by means of the webs 7a and 7b. In other words, the device may comprise receptacles for webs of the linear actuating apparatus, in particular an eyelet thereof, in order to hold the device on the actuating apparatus. Preferably, each half-shell comprises at least one such receptacle. Fig. 2 shows a detailed view of the circled area from Fig. 1. The mountability of the device 4 is ensured in that it consists of two half-shells 8a and 8b, as shown in Fig. 4, for example. For easier handling of the device 4, the two halfshells 8a and 8b are connected by a hinge joint 9. In the opened state, as shown in Fig. 4, one of the two half-shells 8a or 8b can be placed around the web 7a or 7b of the movable eyelet 3. In preparation for this, it must be ensured that the distance between the movable eyelet 3 and the fixed eyelet 2 is sufficiently large to prevent the thread 5 of the device 4 from colliding with the housing 6 during this process. By subsequently closing the device 4, the second half-shell 8a or 8b also fits around the web 7a or 7b. Tightening the two screws 10 prevents the device 4 from opening. By then turning the device 4 about the axis of the thread 5 and simultaneously moving the movable eyelet 3 toward the fixed eyelet 2, the thread 5 is brought into complete engagement, thereby locking the eyelets 2 and 3 relative to one another. The design of the device 4 shown in the Figures allows it to be turned by hand by providing a non-slip surface 11. Accidental separation of the threaded connection 5, e.g. due to vibration, is prevented by the rotation lock 12 shown in Fig. 3. The housing 6 is provided with multiple radially extending grooves 13 on its end face. The device 4 comprises a ball 14 which is loaded by a spring 15. The bushing 16 prevents the ball from being detached, providing a slightly smaller bore diameter at the end of the bore 17 and also allows the ball 14 to move against the spring force. As the thread 5 is screwed-in, the ball 14 comes into contact with the end face of the housing 6. By continuing the screw-in rotation, the ball 14 moves into the device 4 against the spring force, as the device 4 continues to approach the fixed eyelet 2, but the ball 14 can no longer follow this movement due to its contact with the end face of the housing 6. As the screw is rotated further, the ball 14 will reach one of the grooves 13, causing it to move into the groove due to the spring force. The grooves 13 are geometrically configured in such a way that increasing the torque of the screw rotation causes the ball 14 to leave the groove 13 again. As the screw is screwed-in further, the ball 14 will repeatedly move in and out of the grooves 13 until the bushing 16 contacts the front surface of the housing 6. The installation process for the device 4 is now complete. In this state - with the bushing 16 contacting the end face of the housing 6 - the desired prevention of the thread 5 from loosening is yet not highly likely as the ball 14 is unlikely to be located in one of the grooves 13. However, this is only the case until the ball 14 reaches the groove 13 closest to it as a result of the thread 5 accidentally turning loose. The ball 14 then moves into this groove 13, preventing it from rotating loose any further. In order to ensure that the device 4 can be dismounted, the grooves 13 are also geometrically configured in such a way that the above-described possibility of further rotation during engagement of the rotation lock by increasing the torque is also possible in the direction of rotation for loosening.

Claims

1. Device for locking an actuator, preferably a locking sleeve, having two halfshells that are pivotable relative to one another between an open position and a locking position, which are configured in such a way that, in the locking position, the two half-shells are in abutment with each other at their end faces facing each other.

2. Device according to claim 1, characterized in that the device does not have a bayonet lock, but a web-and-groove connection.

3. Device according to claim 1 or 2, characterized in that the device comprises at least one fixing element by means of which the half-shells can be fixed to each other in the locking position, wherein the fixing element is preferably configured in the form of at least one screw which penetrates a partial region of one half-shell and can be screwed into a partial region of the other halfshell.

4. Device according to claim 3, wherein the fixing element comprises at least two screws, which are configured to hold the two half-shells in abutment at their end faces facing each other.

5. Device according to any one of the preceding claims, characterized in that the device comprises a thread at least at one longitudinal-side end, which is configured to engage with a further component, preferably an actuator, in order to hold the device, preferably detachably, on the component.

6. Device according to any one of the preceding claims, characterized in that the device further comprises an anti-rotation means comprising at least one preloaded latch which is configured to engage in a corresponding recess of a housing in order to prevent the device from twisting relative to the housing.

7. Device according to claim 6, characterized in that the at least one latch is configured in the form of a spring-loaded ball which is configured to enter a corresponding groove of the housing.

8. Device according to claim 7, characterized in that the anti-rotation means further comprises a bushing in which the ball is guided, wherein the bushing is configured such that it allows the ball to move with and against the spring force.

9. Linear actuating apparatus, preferably actuator, having a housing, wherein the housing comprises a thread which is configured to engage with a corresponding thread of a device according to any one of the preceding claims.

10. Linear actuating apparatus according to claim 9, characterized in that the housing is equipped with at least one, preferably multiple radially extending grooves on an end face which is configured to come into contact with a device according to any one of claims 1 to 8.

11. System, having a linear actuating apparatus according to any one of claims 9 and 10 as well as a device according to any one of claims 1 to 8, wherein the device is in releasable engagement with the housing of the actuating apparatus by means of a threaded engagement at one of its longitudinal-side ends and preferably at least one latch or ball of the anti-rotation means of the device is in engagement with a groove of the housing.

12. Use of a device according to any one of claims 1 to 8 and / or a system according to any one of claims 9 to 11 for manufacturing and / or equipping an aircraft, in particular an airplane.

13. Aircraft, in particular airplane, comprising at least one device according to any one of claims 1 to 8 and / or a system according to any one of claims 9 to 11.

14. Method for manufacturing and / or equipping an aircraft, in particular an airplane, comprising the step: placing at least one locking sleeve according to any one of claims 1 to 8 and / or a system according to any one of claims 9 to 11 on the aircraft, preferably on an actuator thereof.

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