DE102007054513A1 - Screw connection i.e. differential screw connection, for screwing two components of motor vehicle, has casing inner winding and bolt outer winding whose inclination is smaller/larger than that of one of inner windings and outer winding - Google Patents

Abstract

The connection (1) has a screw element (4) screwed in inner windings (9, 14) of components (2, 3), where the inner winding (9) is provided with an inclination (P1). The element is designed as a screw bolt (5) with a screw sleeve (6). The bolt has an outer winding (8) with an inclination (P1').The sleeve exhibits a casing inner winding (12) with an inclination (Pi), and the bolt exhibits a bolt outer winding (11) with an inclination (Pa), where the inclination of the casing inner winding and bolt outer winding is smaller or larger than the inclination of the inner winding (9) and outer winding. The casing inner winding and the bolt outer winding are screwed together.

Description

The The invention relates to a screw connection of two components by means a threaded member having a differential thread and a screw for such a screw.

State of the art

Differential fittings for screwing two components are known in principle. Their operating principle is that a bolt has two different thread pitches, so that in the course of screwing a tension between these two threaded portions of the bolt occurs and the bolt is supported in each of these thread sections in the thread flanks, so that a support via a screw head or similar formations is not required. For example, is from the DE 31 38 366 C2 a Differenzialgewindebolzen for supporting the driven wheel of a motor vehicle known. However, this has the disadvantage that the differential threaded bolt can not be inserted in superimposed components. This is especially disadvantageous when two components have to be screwed by means of a plurality of differential threaded bolts. The screw connections must in this case be carried out completely synchronously in order to avoid distortion of the individual differential threaded bolts with each other and relative to the individual components; This is very difficult in practice.

task The invention is a screw connection of two components by means to provide a threaded fastener having a differential thread, which avoids these disadvantages and especially in already superposed Components can be screwed.

Disclosure of the invention

For this purpose, a screw connection of two components by means of a differential thread having a screw is proposed, which is provided that the one, first component having a first internal thread with the pitch P ₁ , that the other, second component to the first internal thread of the first component axially aligned, two tes internal thread with the pitch P ₂ , which is the same size as the pitch P ₁ , which is screwed into the first and second internal threads of the first and second components, the screw, which is designed as a screw bolt with a screw and the bolt a first external thread having the pitch P ₁ 'and axially offset from said first external thread P ₁ ' carries the threaded sleeve having an external thread with the pitch P ₂ ', which is screwed into the second internal thread P _{2 of} the second component, wherein the Screw sleeve one sleeve internal thread with pitch P _i and the bolt Stud outer thread having the pitch P _a and sleeve inner thread and bolt outer thread are bolted together, the slopes P _i and P _{a are} smaller or larger than the slopes P ₁ and P ₁ '. Given are therefore two components that are to be screwed together, for example, a lowermost, first component. This has a first internal thread with the pitch P ₁ . On this is the other, second component, which has an internal thread with the pitch P ₂ , which is the same size as the pitch P _{1 of} the first component. Both internal threads are aligned axially. To carry out the screw is the screw, which is composed of the bolt and sitting on this screw. The bolt has at its one end the first external thread with the pitch P ₁ ', which corresponds to the first internal thread in the first component with the pitch P ₁ . The screw is seated by means of a sleeve inner thread introduced into it, which has the slope P _i , screwed on the bolt, namely in particular at the opposite end of the first external thread screw introduced external bolt thread having the slope P _a . The slopes P _i and P _{a of} the sleeve inner thread and the bolt outer thread are in this case smaller or larger than the slopes P ₁ and P ₁ '. Through these different gradients, the differential thread is formed. The screw sleeve, in turn, carries an external thread with the pitch P ₂ 'which is equal to the pitch P ₁ and P ₁ '. Assuming a firm screw the screw on the bolt, so that a relative rotation between the screw and screw is not possible, it is therefore possible to screw the screw in both components that lie on each other, without a tension between the first internal thread , the second internal thread and the screw member occurs. Assuming enforcement of both components with internal threads and the same diameters of these internal threads, it would therefore be possible to screw through the screw easily through both components. The effect of the differential thread occurs when a relative rotation of the screw to the bolt takes place. For example, if the slope of the sleeve inner thread P _i and the associated external bolt thread P _a smaller than the slope P ₁ relationship P ₁ 'and P ₂ and P ₂ ' occurs in the case of a relative rotation of the screw to the bolt during the screwing on the bolt outer thread and the Sleeve internal thread on a tension that extends between the screw and the first external thread at the other end of the bolt acts. The bolt is namely screwed faster on the slope P ₁ in the first component, as the smaller pitch P ₁ and P _a can follow the screw. In particular, at standstill of the screw relative to the bolt, a rapid stress build-up is achieved, which causes the screwing of the two components.

In An embodiment of the invention is the diameter of the first external thread substantially equal to the diameter of the sleeve outer thread. In this case, you can the internal threads should be of substantially equal diameter, so an optional arrangement of the components to be screwed possible is.

In In another embodiment, the diameter of the first external thread smaller than the diameter of the sleeve outer thread. In this case, the diameter of the second internal thread (in second component), which corresponds to the screw sleeve, larger, so that the arrangement of the components is not is optional, but the first component under the second component must be arranged. However, this arrangement allows, for example the substantially same diameter configuration of the bolt and a particularly easy insertion of the screw in the axially aligned internal thread of the components, since the smaller diameter first external thread through the larger diameter second external thread can be easily inserted.

In Another preferred embodiment is the screw connection a countersunk fitting. Under countersunk fitting is hereby understood that after performing the screw the Screw no longer protrudes from the components, but completely incorporated in this, for example, the Threaded sleeve caught in the second internal thread, without the first external thread of the bolt from the first component protrudes. This can be space-saving Very easy to perform screw connections. In particular, must especially with moving components that are to be screwed, not on movement clearance for protruding screw heads consideration be taken.

In a particularly preferred embodiment is between Screw sleeve and bolt, especially in the area the external bolt thread and the sleeve internal thread, provided a torque-dependent locking solvent. This is ge means that the bolt outer thread and the Sleeve internal thread with respect to a relative rotation the screw sleeve to the bolt over the locking solvent be secured. A twisting of the screw sleeve on the Bolt is only when opening the locking solvent possible. This opening is dependent on the torque. This means that the screw sleeve on the bolt as long as locked and locked until in the course of screwing a certain torque is applied, for example as Positioning torque can be viewed. When applying the positioning opens the blocking solvent, so that the relative rotation the screw to the bolt is possible and via the differential thread described above the tension between the first external thread of the bolt and the sleeve outer thread, respectively from the first Internal thread of the first component or the second internal thread supported by the second component begins.

In a preferred embodiment is the barrier solvent a jamming or sticking. The screw sleeve is therefore on the bolt in the area of the bolt outer thread stuck or glued. A deadlock can be through an example slightly oval design of the sleeve inner thread cause or by other, subject to deformation training. Bonding may be readily accomplished by means known in the art Adhesives are produced.

In a further preferred embodiment, the locking solvent is released during screwing by striking the threaded sleeve to a provided on a component, in particular on the second component, detent or taper. To apply the positioning torque described above, a torque must be applied, which acts between the bolt and the screw, namely the positioning torque. To apply this torque, a catch or a taper in the region of the second component is provided in a simple and advantageous manner, that is, where the screw is introduced with the screw. This catch can be, for example, that the second internal thread, which is introduced on the second component, ends, and only a diameter is still present, which is suitable for the insertion of the screw, especially if, as described above, the diameter of the first external thread smaller than the diameter of the sleeve outer thread. This may in particular also be the case in the transition region between the components, for example by a first diameter thread having a smaller diameter throughout the first component, so that a step occurs. Further rotation of the screw in the second internal thread is from beating to this threaded end, which is to be regarded as a catch or taper, no longer possible. However, if the bolt is further rotated, it comes to applying a torque, which upon reaching the positioning torque the Sperrlösemittel between bolts and screw sleeve opens, so for example, the bond breaks off or overcomes the forces applied by the clamping forces between screw and bolt. The bolt is then further rotated at a fixed screw, being characterized by the greater pitch P _{1 of} the first external thread of the bolt relative to the sleeve inner thread with the pitch P _i and the bolt outer thread with the pitch P _a, the tension of the bolt on the screw between the first and the second component results.

In in another embodiment, the blocking solvent during screwing by striking the screw to a provided in the head region of the bolt catch or thickening triggered. The bolt is in this case designed such that the screw sleeve on the external bolt thread do not let it unscrew out of the bolt arbitrarily far. Rather, in the head area of the bolt (ie the first External thread opposite) provided catch or thickening as Wegbegrenzung for the screw of the Screw sleeve on the bolt. Beat the Screw sleeve during the screw connection to this Distance limitation, further rotation is not possible. It is also possible that this limit by the attacking screwing tool is formed, so not permanent is provided on the bolt. This can be done, for example happen that the attacking tool over the diameter the bolt protrudes and at least partially the screw sleeve is applied.

It is further a screw with a bolt and a Screw sleeve, which form a differential thread, in particular proposed for a screw according to the above description. In this case, the screw element particularly preferably already has this described between acting screw and bolt, Torque-dependent locking solvent on.

In a further embodiment, the screw bolt in his head a tool holder, the tool holder serves to attack a screwing tool, by means of which the screwing is carried out. The tool holder is preferably a shape-adapted, in particular axial recess of the head area. By this is meant that the bolt in his head area has a recess which is axially aligned and the shape of the Bolting provided work tool is adapted. Be considered For example, torx, hexagon or other suitable, for application larger torques suitable geometries.

In Another embodiment is the tool holder a shape-adapted, in particular axial extension of Bolt. Analogous to the formation by means of a recess, the Tool holder also as an extension of the bolt be formed, ie such that the tool attack Serving geometry over the head portion of the bolt protrudes.

In Another embodiment of the screw is the Tool holder designed so that when tool attack to carry out the Screwing the tool at least partially a rotation lock for the screw sleeve relative to the bolt forms. The twist lock is thus shaped by the tool designed that the rotation lock when removing the tool eliminated. This can be done, for example, by overhanging of the tool in the radial direction over the tool holder or the diameter of the bolt out into the area the screw in done.

Further advantageous embodiments will become apparent from the dependent claims and a combination thereof as well as the description of the following Embodiment.

The Invention will be described below with reference to an embodiment described, but not limited thereto.

It shows

the Figure a screw connection of two components by means of a differential thread having screwing element.

The figure shows a screw connection 1 a first component 2 with a second component 3 by means of a screw element 4 , The screw element 4 consists of a bolt 5 and a screw sleeve 6 , The bolt 5 indicates at its first end 7 a first external thread 8th on, with a first internal thread 9 in the first component 2 corresponds. The first internal thread 9 in this case has the slope P ₁ , which corresponds to the pitch of the first external thread P ₁ '. Axially offset thereto, preferably in a first end 7 opposite head area 10 , points the bolt 5 a bolt external thread 11 on, the one sleeve inner thread 12 the on the bolt 5 in his head area 10 screwed on screw sleeve 6 equivalent. The screw sleeve 6 again has a sleeve outer thread 13 on, that a second internal thread 14 on the second component 3 equivalent. The second inside thread de 14 In this case, the pitch P _{2 has} a pitch P ₂ 'of the sleeve outer thread 13 equivalent. The sleeve inner thread 12 has the slope P _i , the slope P _{a of} the external bolt thread 11 equivalent. In the head area 10 of the bolt 5 is wider, final and axial over the bolt 5 also extends, a tool holder 15 to attack a tool 16 formed, namely as a shape-adapted axial extension 17 , Between the first external thread 8th and the male external thread 11 of the bolt 5 there is a thread-free section 18 , The second internal thread 14 is not continuous through the second component 3 passed through but ends up training as a stage 19 trained detent 20 , The second internal thread 14 begins on the upper side of the second component 3 and ends in a first component 2 closer area 21 of the second component 3 ,

To effect the screw connection 1 becomes the screw element 4 with screwed on in the head screw sleeve 6 in the axially aligned first and second internal threads 9 . 14 introduced and by means of the tool 16 screwed in rotation. The slopes P ₁ and P ₂ or P ₁ 'and P ₂ ' are the same size, so that the screw 4 upon engagement of the first external thread 8th in the first internal thread 9 or the sleeve outer thread 13 in the second internal thread 14 can be screwed without tension. The screw sleeve is preferred 6 here at a Kopfendenunterbereich 22 arranged, namely screwed on, ie at such an area of the head area 10 that is not the tool holder 15 initially, but away from this towards the first end 7 of the bolt 5 ,

Between the bolt 5 and the screw sleeve 6 is in the range of sleeve internal thread 12 and male external thread 11 at least at the beginning of the screwing process, a torque-dependent locking release 23 designed, for example, as a bond 24 can be executed by means of a common thread adhesive. By the barrier solvent 23 becomes a relative rotation between screw 6 and bolts 5 prevented. Since the pitches P ₁ and P _{2 are the} same, consequently, the screw is 4 if the release agent is not dissolved evenly into the first internal thread 9 and the second internal thread 14 screwed. The barrier solvent 23 in this case allows the determination of the screwing depth of the screw 4 before the tension starts through the differential thread. Meets the screw sleeve 6 on the catch 20 , is a further rotation of the screw 6 prevents, since the subsequent diameter smaller than the inner diameter of the first internal thread 9 or the outer diameter of the screw 6 is. The screw sleeve 6 consequently beats at the catch 20 while, with continued operation of the tool 16 in the course of bolting further torque on the bolt 5 is exercised. This applies a moment between the bolt 5 and the screw sleeve 6 acts, namely in the area of the barrier solvent 23 , The barrier solvent 23 In this case has a positioning moment M _p , when it exceeds the Sperrlösemittel 23 opens, so the relative rotation of the bolt 5 for now fixed screw 6 makes possible. In the present embodiment, the slope P ₁ and P ₁ 'of the first outer and inner thread 8th . 9 greater than the pitch P _{a of} the external bolt thread 11 or the pitch P _{i of} the sleeve inner thread 12 , As a result, the bolt becomes faster over the first external thread 8th in the first internal thread 9 screwed in ahead, as he over the bolt outer thread 11 and the sleeve inner thread 12 is tracked. As a result, there is an elongation of the bolt 5 relative to the threaded sleeve 6 and to the first component 2 , causing the the screw connection 1 causing tension occurs.

To form the catch 20 Of course, other embodiments are possible, for example, a mere ends of the second internal thread 14 with a slight diameter reduction or the attachment of a spot weld or the like, a detent 20 causing mechanical lock. The barrier solvent 23 can except by a bond 24 for example, by a certain ovality of the sleeve inner thread 12 relative to the external bolt thread 11 be effected. It only needs such a free rotation of the screw 6 on the bolt 5 be avoided that a change in position of the screw 6 relative to the axial extension of the bolt 5 prevented in an undesirable moment. The positioning moment M _p is in fact just the screwing depth and positioning of the screw 4 relative to the components 2 . 3 to be able to determine.

P₁

Steigung

P₁'

Steigung

P₂

Steigung

P₂'

Steigung

P_i

Steigung

P_a

Steigung

M_p

Positioniermoment

Exceptional items

P ₁

pitch

P ₁ '

pitch

P ₂

pitch

P ₂ '

pitch

P _i

pitch

P _a

pitch

M _p

Positioniermoment

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3138366 C2 [0002]

Claims (14)

Screw connection ( 1 ) of two components by means of a screw having a differential thread ( 4 ), characterized in that the one, first component ( 2 ) a first internal thread ( 9 ) with the pitch P ₁ , that the other, second component ( 3 ) to the first internal thread ( 9 ) of the first component ( 2 ) axially aligned, second internal thread ( 14 ) with the pitch P ₂ , which is the same size as the pitch P ₁ , that in the first and second internal thread ( 9 . 14 ) of the first and second components ( 2 . 3 ) the screw element ( 4 ) is screwed, as a bolt ( 5 ) with a screw sleeve ( 6 ) is formed and the bolt ( 5 ) a first external thread ( 8th ) with the pitch P ₁ 'and axially offset from said first external thread ( 8th ) the screw sleeve ( 6 ), which has an external thread with the pitch P ₂ ', in the second internal thread ( 14 ) of the second component ( 3 ) is screwed, wherein the screw sleeve ( 6 ) a sleeve internal thread ( 12 ) with the pitch P _i and the bolt ( 5 ) a bolt outer thread ( 11 ) with the pitch P _a and sleeve inner thread ( 12 ) and external bolt thread ( 11 ) are screwed together, the slopes P _i and P _{a are} smaller or larger than the slopes P ₁ and P ₁ '. Screw connection ( 1 ) according to claim 1, characterized in that the diameter of the first external thread ( 8th ) substantially equal to the diameter of the sleeve outer thread ( 13 ). Screw connection ( 1 ) according to one of the preceding claims, characterized in that the diameter of the first external thread ( 8th ) smaller than the diameter of the sleeve outer thread ( 13 ). Screw connection ( 1 ) according to one of the preceding claims, characterized in that the screw connection ( 1 ) is a countersunk fitting. Screw connection ( 1 ) according to one of the preceding claims, characterized by a between threaded sleeve ( 6 ) and bolts ( 5 ), in particular in the area of the external bolt thread ( 11 ) and the sleeve inner thread ( 12 ), provided, torque-dependent locking solvent ( 23 ). Screw connection ( 1 ) according to one of the preceding claims, characterized in that the barrier solvent ( 23 ) is a jamming or gluing. Screw connection ( 1 ) according to one of the preceding claims, characterized in that the barrier solvent ( 23 ) during screwing by striking the screw ( 6 ) to a on a component, in particular on the second component ( 3 ), provided catch ( 20 ) or rejuvenation is resolved. Screw connection ( 1 ) according to one of the preceding claims, characterized in that the barrier solvent ( 23 ) during screwing by striking the threaded sleeve ( 6 ) to one in the head area ( 10 ) of the bolt ( 5 ) provided catch ( 20 ) or thickening is solved. Screw element ( 4 ) with a bolt ( 5 ) and a threaded sleeve ( 6 ), which form a differential thread, in particular for a screw connection ( 1 ) according to any one of the preceding claims. Screw element ( 4 ) according to claim 9, characterized by a between threaded sleeve ( 6 ) and bolts ( 5 ) acting, torque-dependent locking solvent ( 23 ). Screw element ( 4 ) according to one of the preceding claims, characterized in that the bolt ( 5 ) in his head area ( 10 ) a tool holder ( 15 ) having. Screw element ( 4 ) according to one of the preceding claims, characterized in that the tool holder ( 15 ) a shape-adapted, in particular axial recess of the head region ( 10 ). Screw element ( 4 ) according to one of the preceding claims, characterized in that the tool holder ( 15 ) a shape-adapted, in particular axial extension ( 17 ) of the bolt ( 5 ). Screw element ( 4 ) according to one of the preceding claims, characterized in that the tool holder ( 15 ) is designed so that during tool engagement for performing the screw ( 1 ) the tool at least partially a rotation lock for the screw relative to the bolt ( 5 ).