DE102007057551B4 - Miniaturized force element - Google Patents

Abstract

A miniaturized force element (10) is described which has a cylindrical guide element (12) in which a working element (14) is provided. A closing element (26) has an ignition device (32) for an explosive (42) provided in a cargo space (40) of the working element (14). The working element (14) is cap-like with a thin cylindrical side wall (24) and is preferably formed from a sheet metal part produced by drawing. The closing element (26), the cap-like working element (14) and the cylindrical guide element (12), preferably also formed by a sheet metal part produced by drawing technology, are connected to one another in a sealing manner, preferably welded. The thin cylindrical side wall (24) of the working element (14) has a predetermined breaking point (44).

Description

The invention relates to a force element according to the preamble of claim 1.

Known force elements function by means of a pyrotechnic charge which is ignited, burns off, thereby developing gas and other components which expand and effect. H. Move work item. The working element is, for example, designed as a piston.

The components used for such known force elements are usually complex in nature and usually produced by turning technology. The seal between the guide element and the working element is realized by fits and / or by sealing elements. However, fits require a corresponding production cost. This affects the manufacturing costs. Force elements sealed by sealing elements or by means of lacquering have the defect that they are not hermetically sealed with regard to possible environmental flows during storage. Another shortcoming of such known power elements is their relatively large volume of construction. The pyrotechnic propellants of known power elements used have relatively large masses and burn to form slags and smoke, whereby adjacent mechanical components can be disturbed.

From the DE 83 06 744 U1 , of the EP 1 396 394 A1 and the EP 0 488 937 A2 different ignition devices are known.

In view of these circumstances, the invention has for its object to provide a force element of the type mentioned, which can be produced easily and inexpensively small volume, d. H. miniaturized and does not have the above defects.

This object is achieved by the features of claim 1. Preferred embodiments or further developments of the miniaturized force element according to the invention are characterized in the subclaims.

In the case of the miniaturized force element according to the invention, at least the cap-like working element is expediently formed by a sheet-metal part produced by drawing technology. Conveniently, the guide element for the working element is formed by a sheet-metal part produced by drawing. Of particular importance is that the cap-shaped working element has a thin cylindrical side wall, so that the working element reliably seals against the cylindrical guide element in a simple manner by the thin side wall of the working element is expanded by the pressure generated by the explosive in the charge space and on the inside of the guide element sealing tight and rubbing comes to rest, so that own sealing elements are unnecessary. By the said friction bouncing of the working element is prevented upon reaching the end position in an advantageous manner.

The advantageously formed by a thin-walled sheet metal part cap-like working element and advantageously also formed by a sheet metal part guide element allow cost-effective production and small dimensions of the force element according to the invention.

The cap-like working element may additionally have another, for example. Rotationally manufactured component, such as a piercing needle o. The like. Have.

The guide element of the miniaturized force element according to the invention may be formed with a beading edge which determines the end of the working path of the working element, so that no parts are advantageously ejected at the end of the working path.

The charge space containing an explosive of the miniaturized force element according to the invention is at rest. H. Bearing condition hermetically sealed. This is achieved in that the sleeve of the end element of the miniaturized force element, the thin cylindrical side wall of the working element and the cylinder sleeve of the guide element are sealingly welded together. This can be a laser welding.

When the explosive in the charge space is ignited, the pressure generated in the charge space ruptures the predetermined breaking point provided in the thin side wall of the working element, so that the originally fixed working element becomes free and can move in the guide element to the end of its working travel.

The charge space may have an additional element to reduce the charge volume. This additional element may, for example, be an inert material.

In the miniaturized force element according to the invention, the charging of the charge space does not consist of a pyrotechnic charge but of a primary or secondary explosive, which generates substantially gas and negligible or no metal compounds during its conversion. The explosive is advantageously phlegmatized by additives and processing technology so far that it does not detonate under the given conditions but merely burns off. In this way, a sufficiently shock-wave acceleration of the cap-like working element is achieved in the guide element.

The minimization of the charge also advantageously allows an increase in the safety of the force element according to the invention.

Further details, features and advantages will become apparent from the following description of an enlarged embodiment of the inventive miniaturized force element shown in the drawing.

The figure shows a longitudinal sectional view of an embodiment of the miniaturized force element 10 that is a guiding element 12 for a work item 14 having.

The guide element 12 is formed by a sheet metal part produced by drawing; it is as a cylinder sleeve 16 formed at one end with an outer peripheral flange 18 and at its second end remote therefrom with a crimp rim 20 is trained. The crimp rim 20 determines the end of the work path of the work item 14 ,

The work item 14 is formed by a sheet metal part produced by drawing, it has an end wall 22 and a cylindrical side wall integrally connected to said material 24 on.

The cap-like working element 14 is with a finishing element 26 combined. The final element 26 has an insulating body 28 on, through which spaced from each other two connection elements 30 extend, which with a Zündbrückenelement 32 are contacted. The ignition bridge element 32 is at the inner end face 34 of the insulating material 28 appropriate.

The insulating body 28 of the final element 26 is from a sleeve 36 enclosed. The sleeve 36 , the cylindrical side wall 24 of the cap-like working element 14 and the cylinder sleeve 16 of the guide element 12 are at the side of the miniaturized force element 10 at which the connection elements 30 protrude, concealed with each other sealingly. This circumferential weld is indicated by the reference numeral 38 designated.

Between the inner end face 34 of the final element 26 and the front wall 22 of the cap-like working element 14 is a cargo space 40 Definitely, for an explosive 42 is provided.

Is attached to the connection elements 30 an ignition voltage applied, so the ignition bridge element melts 32 , causing the explosive 42 is ignited. The generated thereby gas ie internal pressure causes a circumferential predetermined breaking point 44 in the thin cylindrical side wall 24 of the work item 14 rips apart and the working element 14 in the guide element 12 becomes free.

The circumferential breaking point 44 in the cylindrical side wall 24 of the cap-like working element 14 is designed, for example, as a circumferential notch or groove.

In the miniaturized force element according to the invention 10 can the work path of the work item 14 For example, 3 mm and the longitudinal dimension of the guide element 12 For example, be 4 mm. The outer diameter of the force element 10 can z. B. 2.3 mm.

At the explosive 42 in the cargo area 40 it is preferably a phlegmatized explosive having a mass of ≤ 1 mg.

The values given last are only intended to indicate the large proportions of the miniaturized force element according to the invention 10 clarify; Of course, other dimensions and explosive masses are possible.

LIST OF REFERENCE NUMBERS

10

Miniaturized force element

12

Guide element (from 10 For 14 )

14

Work item (from 10 in 12 )

16

Cylinder sleeve (from 12 )

18

Circumferential flange (from 16 )

20

Border edge (from 16 )

22

Front wall (from 14 )

24

Cylindrical sidewall (from 14 )

26

End element (from 10 in 14 )

28

Insulating body (from 26 For 30 and 32 )

30

Connection elements (from 26 For 32 )

32

Ignition bridge element (at 34 )

34

Inner face (from 28 )

36

Sleeve (on 28 )

38

Welding (between 36 . 24 and 16 )

40

Cargo space (between 34 and 22 For 42 )

42

Explosives (in 40 )

44

Breaking point (in 24 )

Claims (10)

Miniaturized force element ( 10 ), with a guide element ( 12 ), in which a working element ( 14 ) and with a terminating element ( 26 ), which has an ignition device, wherein the closure element ( 26 ) and the working element ( 14 ) a cargo space ( 40 ), in which an explosive ( 42 ) is provided, wherein the closing element ( 26 ), the working element ( 14 ) and the guide element ( 12 ) are sealingly welded together, the working element ( 14 ) cap-like with a thin side wall ( 24 ) is formed, which a predetermined breaking point ( 44 ), which is set up by the ignition of the explosive ( 42 ) in the cargo space ( 40 ), so that the working element ( 14 ) and can be released in the guiding element ( 12 ) is movable under the influence of the pressure generated to the end of its working travel, wherein the thin cylindrical side wall ( 24 ) of the working element ( 14 ) is configured such that the working element ( 14 ) against the cylindrical guide element ( 12 ) by sealing the thin side wall ( 24 ) of the working element ( 14 ) by the explosive ( 42 ) in the cargo space ( 40 ) generated pressure is expanded and on the inside of the guide element ( 12 ) comes sealingly tight and rubbing to the plant. Miniaturized force element ( 10 ) according to claim 1, wherein the end of the working path of the working element ( 14 ) by a beading edge of the guide element ( 12 ) at which an end wall ( 22 ) of the working element ( 14 ) can come to a stop, so that, even after the working element ( 14 ) has reached the end of its working path, no combustion gases from the miniaturized force element ( 10 ), which could otherwise interfere with adjacent mechanical components. Miniaturized force element ( 10 ) according to claim 1 or 2, wherein the cap-like working element ( 14 ) is formed by a sheet metal part produced by drawing. Miniaturized force element ( 10 ) according to claim 3, wherein also the guide element ( 12 ) is formed by a sheet metal part produced by drawing. Miniaturized force element ( 10 ) according to one of claims 1 to 4, wherein the closure element ( 26 ) one in a sleeve ( 36 ) fixed insulating body ( 28 ) with an inner end face ( 34 ), wherein through the insulating body ( 28 ) spaced from each other connecting elements ( 30 ) which engage with one on the inner face ( 34 ) of the insulating material body ( 28 ) mounted ignition bridge element ( 32 ) are contacted. Miniaturized force element ( 10 ) according to claim 5, wherein the sleeve ( 36 ) of the closing element ( 26 ), the thin cylindrical side wall ( 24 ) of the cap-like working element ( 14 ), and the cylinder sleeve ( 16 ) of the guide element ( 12 ) at the end of the miniaturized force element ( 10 ), to which the connecting elements ( 30 protrude, are welded together sealingly. Miniaturized force element ( 10 ) according to one of claims 1 to 6, wherein in the thin cylindrical side wall ( 24 ) of the cap-like working element ( 14 ) predetermined breaking point ( 44 ) is formed by a circumferential notch or groove. Miniaturized force element ( 10 ) according to one of the preceding claims, wherein the explosive ( 42 ) containing charge space ( 40 ) has an additional element to reduce the charge volume. Miniaturized force element ( 10 ) according to one of the preceding claims, wherein the in the cargo space ( 40 ) explosives ( 42 ) is a primary or secondary explosive. Miniaturized force element ( 10 ) according to claim 9, wherein the explosive ( 42 ) is phlegmatized by additives and processing technology.

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