IL93088A - Arrangement for transforming a rotary movement into a translational movement - Google Patents

Description

n ■» "lK-i ί? nynni? mm-^o nynn n3"3?it> i ¾o ARRANGEMENT FOR TRANSFORMING A ROTARY MOVEMENT INTO A TRANSLATIONAL MOVEMENT The invention concerns an arrangement for translating a rotary motion into a translational motion.

Such an arrangement is known for example from U.S. Patent No. 3,568,j)57. This arrangement comprises a threaded spindle and a nut element which is linearly movable and secured against rotation. A rotation of the threaded spindle about its central logitudinal axis results in a linear movement of the nut element and, therefore, in the transformation of the rotary movement of the threaded spindle into a translational movement of the nut element. Such an arrangement occupies a large space, owing to the length dimensions of the threaded spindle. Likely defficient are arrangements using, for transforming a rotational motion into a translation motion, gears engaging toothed rods.

The object of the invention is to provide an arrangement of the above defined kind which is compactly built and therefore requires a relatively small space.

( The above object is realized by providing a second element !'L co-axially arranged in relation to a first element, said second element being rotatable about a common axis of rotation by a drive arrangement situated between said first and second elements, and said second element cooperates with a third element for transforming the rotary movement of said second element into a translationl movement of said third element, wherein said third element is linearly guided along a guide arrangement. This arrangement^ has only^ three elements_....which are_ compactly built together. The first element serves as a bearing for the second element, which is adapted to perform a rotary movement relative to the first element. This rotary movement of the second element, relative to the first element, is transformed by means of a transformation arrangement into a translational movement of the third element. The direction of the translationl movement is defined by the guide arrangement and the direction of rotation of the second element.

The transformation arrangement may be an outer screw section, provided on the second element, and an inner screw section, provided on the third element, which are adapted to be relatively screwed about the common rotation axis . A rotation of the second element relatively to the first element causes a translational movement of the third element along the guide element,, which.. revents the third element from rotating. An arrangement as described above is simple to produce, simple to assemble and functions also under extreme environmental conditions.

Instead of an outer and inner screw sections, the transformation arrangement may be configured also as a cam plate and a follower contacting said cam plate. The cam plate may be arranged either on the second element or on the third element of the arrangement. Correspondingly, the follower is provided either on the third or on the second element of the arrangement. The cam plate and the follower contacting the same are so configured that in case of a movement, that is a rotation of the seco^nd element about the first element, between the second and third element, a self-jamming is precluded.

Another embodiment of the arrangement for transforming a rotary movement into a translational movement is characterised in that the transformation arrangement comprises an inclined toothed section and an element engaging said inclined toothed section. The inclined toothed section may be provided on the second element. In this case the engaging element is situated on the third element of the arrangement. The engaging element may be configured as a pin, an attachment or an inclined toothed on the third element section corresponding to the inclined toothed section provided on the second " element, dovetailingly engaging the same. It is self-evident to provide the inclined toothed section on the third element and the engaging element on the second element of the arrangement.

The guide arrangement is preferably in a direction at least approximately parallel to the central rotation axis of the arrangement. With such an arrangement a translational movement of the third element in the direction of the axis of rotation of the arrangement results. However, it is also possible to provide the guide arrangement in a direction approximately normal to the direction of the central rotation axis. In this case a translational movement of the third element in a direction normal to the axis of rotation results. The choice of the direction of the movement of the third element relative to the input rotational movement of the arrangement is dependent of the intended application.

The drive arrangement may comprise at least one pyrotechnic force element. It is known to build up a gas pressure in a hollow space, in a known manner, by means of such a pyro-' technic force element, said gas pressure being utilised to induce a rotary movement of the second element in relation to the first element.

V Instead of a pyrotechnic force element it is also jgossible__ that the drive element should comprise at least one spring element or it may be configured as a pneumatic^hydraulic fluid, drive. By mechanical stressing of a spring element it is possible, in a known manner, to store energy in a spring element, which will become free at a certain movement by releasing the spring element. Also this results in a possibility of inducing a rotary movement of the second element rotatably held in the first element.

In a preferred embodiment of the arrangement, the first element is a cylinder section, and the second element is configured as a ring rotatably held on the cylinder section of the first element serving as a bearing, wherein an annular hollow space is provided between the first and second element, the first element having a first attachment in said hollow space, facing the second element, and the second element is provided with a second attachment in said hollow space facing the first element, wherein the drive arrangement is provided in a section defined by said first and said second attachments in said hollow space. The attachment of the first element performs the function of a cylinder bottom and the attachment of the second element the function of a jpiston, which is moved on the activation of the drive arrangement in a rotary motion away from the attachment of the first element.

According to the invention, the above described arrangement is particularly suitable to transform a rotational movement into a translational movement to open out at least one wing element of a projectile released from a carrier or launched from a container. Such a flying body may be, for example, a glide bomb provided with wing element forming a tail rudder.

Further particulars, characteristics and advantages are obvious from the description illustrated by the drawings of embodiments of the arrangement according to the invention for transformation of a rotary motion into a translational motion, including also an application of the arrangement.

The Figures represent: Fig. 1 - a half side-section through the first embodiment of the arrangement.

Fig. 2 - a section along line II-II in Fig. 1.

Fig. 3 - a half side-section of second embodiment of the arrangement .

Fig. 4 - a section-like representation of the arrangement according to Fig. 3, viewed in the direction of arrow IV.

Fig. 5 - a corresponding section representation of a third embodiment of the arrangement.

Fig. 6 - a section-like representation of the arrangement according to Fig. 5, viewed from above, wherein the illustration of the engagement element of the transformation arrangement was dispensed within order to clearly illustrate the inclined toothed section of the transformation arrangement; and Fig. 7 - a schematic represntation of a flying body configured as a glide bomb in which an arrangement for transforming a rotary movement into a translational movement is used.

Fig. 1 illustrates an arrangement (10) for transforming a rotary movement into a translational movement comprising a first element (12), a second element (14) and a third element (16). This Figure stresses the compactness of arrangement (10).

First element (12) comprises a cylinder segment (18) which has, in order to reduce the weight of arrangement (10), a central recess (20). Cylinder segment (18) is provided with threaded bores (22), which are, as may be seen from Figure 2, equally distributed in the peripheral direction of cylinder segment (18). A flange (24) is connected to cylinder segment (18), extending radially away from one end face of cylinder segment (18). A second element (14) of a U-shaped cross-section is bearingly mounted on cylinder section (18), rotatable about a common axis of rotation (26). The second element (14) comprises two ring-shaped flanges, (28) and (30), distanced from each other, connected by peripheral web part (32), the last three parts together with cylinder section (18) defining an_annular hollow space (34). Reference numbers (36) indicate two annular bearings, or sealing elements, arranged in recesses of flange parts (28) and (30), as bearing elements of second element (14) on cylinder segment (18) of first element (12), and also to seal annular gas expansion hollow space (34), flange part (28) being of two parts, in order to enable the mounting of the second piston.

In order to prevent element (14) from moving accidentally in the direction of the central rotation axis (26), second element (14) contacts with flange part (30) a securing element (38), which element is mounted on first element (12) by means of screw elements (40), screwed into threaded bores (22) .

The peripheral part (32) of second element (14) has an outside thread section, forming part of transformation arrangement (44). An inner thread section (46) of third element (16) corresponds to said outer thread section (32) of the second element (14), said third element is annular and has a step surface (48). Third element (16) comprises through bores (50), equally distributed peripherally (see also Fig. 2), pins (52), affixed on flange (24) of first element (12). The pins (52) are parallel to the direction of the central rotation axis, and serve to prevent third element (16) from rotating about the central axis of rotation (26) of arrangement (10). When second element 114) rotates relatively to first element (12) about the common axis of rotation (26) of arrangement (10), this will result by means of outer thread section (42). and inner thread section (46) a transformation arrangement (44), in a screw movement of third element (16) in the direction of pins (52), or of through bores (50), which means a translational movement of third element (16) in the direction of the central rotation axis (26), this enables an element (not illustrated) contacting step (48) to perform the desired movement.

It may be seen from Figure 2 that the first element (12), or the cylinder segment (18) of the same, has a first attachment (54) extending radially outward from cylinder segment (18). The peripheral part (32) of second element (14) is configured with a second attachement (56), extending radially inward from peripheral part (32). Attachments (54) and (56) divide the annular hollow space (34) into a first hollow space section (58) and a second hollow space section (60). The first hollow space section (58) serves, for example, as an active expansion space, the second hollow space section serves, in this case, for enabling second element (14) to perform a rotary motion about the common axis of rotation (26). In order to perform this rotary movement of the second element relative to the first element (12), a pyrotechnical force element (not illustrated) may be provided in first hollow space section (58). On the activation of this force element a pressure is generated in hollow space section (58), moving second attachment (56) away from the first attachement (54). In order to seal these attachments, they may be configured with labyrinth seals ( 62 ) .

Figure 3 represents a half side logitudinal section through a second embodiment of the arrangement (10), for translating a rotary motion into a translational motion. The arrangement (10) comprises a first element (12), a second element (14) and a third element (16), wherein the second element (14) is bearingly mounted on first element (12) for rotation about common axis of rotation (26). The first element (12) and the second element (14) bearingly mounted on the first element (12) are constructed identically with the embodiment of the arrangement described in Fig. 1, therefore it is redundant to repeat the description of all details of said elements (12) and (14). AS may be seen also from Fig. 4, the transformation arrangement (44) between second element (14) and third element (16) comprises a cam disc (64) and a follower (66) contacting cam disc (64). The follower (66) is constructed as a pin, radially extending from the peripheral part (32) of second element (14). Cam disc (64) has an opening (68) (See Fig. 4) through which follower (66) extends. Cam disc (64) is linearly guided along guide elements (70) distanced from each other and parallely orientated, and affixed to mounting attachments (72) and (74). Mounting attachments (72) are integral with flange (24) of first element (12) and mounting attachments (74) are radially extending from securing element (38). Cam disc (64) has two longitudinal slots (76) on the opposite narrow edges, into which the corresponding guide elements (70) extend. A rotation of second element (14) about the central axis of rotation (26) in the direction of arrow (78) results in a translatiohal movement of cam disc (64) in the direction of arrow (80), wherein cam disc element (64) performs the fuction of third element (16) of arrangement (10).

Figures 5 and 6 represent a third embodiment of the arrangement (10), which differs in particular from the embodiment of Figures 1 and 2 in that the transformation arrangement (44) for the transformation of a rotary motion of element (14) into a translational motion of element (16) comprises inclined toothed sections (80), respectively (82), on the peripheral part (32) of second element (14) and on third element (16). Inclined toothed section (80) and (82) are inclined relative to the central axis of rotation (26) with an appropriate angle preventing self-inhibition. A rotation of second element (14) in the direction of arrow (84) results therefore in a translational movement of third element (16) along pins (52) provided on first element (12) serving as a linear guide in the direction of arrow (86).

Figure 7 represents a partially cut away side view of a flying body (88), which may be, for example, a glide bomb ejectable from a container. Flying body (88) comprises fixed rudder elements (92) on the tail (90) and movable rudder elemebts (94) adapted to be opened out. The rudder elements adapted to be opened out are tiltable relatively to the corresponding fixed rudder elements (92) about axis (96). Arrangement (10) is provided to perform this task, said arrangement being constructed with a step (48) (see also Fig. 1). The movable, adapted to be opened out, rudder elements (94) are contacting with an end section adjacent to axis (96) step (48) and therefore a translational movement of third element (16) comprising step (48) in the direction of the central axis (98) of flying body (88) , co-extending with the central axis of rotation (26) of arrangement (10) will result in a tilting of movable rudder elements (9 ) . The translational movement of third element (16) is initiated by a rotary movement of the second element (14) of arrangement (10) relatively to first element (12) (see Figures 1 to 6 ) .

Claims (7)

1. An arrangement for translating a rotary motion into a translational motion for opening out at least one wing element of a flying body comprising a first and a second" elements characterized in that the first element comprises a cylinder section, the second element being a ring co-axially rotatably mounted on said cylinder section of the first element, wherein an annular hollow space is defined between the first and the second element and the first element comprises a first attachment in said hollow space, facing said first element, said second element being rotatable about a common axis of rotation by a drive arrangement situated in the section of said annular space defined by said first and second elements, said second element cooperating with a third' element for transforming the rotary movement of said second element into a translational movement of said third element, wherein said third element is linearly guided along a guide arrangement.

2. An arrangement according to claim 1 characterised in that said transformation arrangement has an outer screw section provided on said second element and an inner screw section provided on said third element, which are adapted to be relatively screwed in the direction of the common axis of rotation.

3. An arrangement according to claim 1 characterised in that the transformation arrangement comprises a cam plate and a follower contacting said cam plate.

4. An arrangement according to claim 1 characterised in that the transformation arrangement comprises an inclined toothed section and an element engaging said inclined toothed section. 93088/2

5. An arrangement according to claim 1 characterised in that the guide arrangement is at least approximately parallely orientated to the central axis of rotation of said arrangement.

6. An arrangement according to claim 1 characterised in that the drive arrangement comprises at least one pyrotechnic force element.

7. An arrangement according to claim 1 characterised in that the drive arrangement comprises at least one spring element. ATTORNEYS FOR APPLICANTS