DE102008017474A1 - Fastening unit for use as part of bolt connection in module, has washer inserted on pin over recess and is brought against pin in radial direction in tolerance-free manner, where inner diameter of recess is same as outer diameter of pin - Google Patents

Abstract

The fastening unit (1) has a pin (1.2) with an outer diameter (Da) and a concentric central recess (1.4) with an inner diameter (Di) and a center axis (M). A washer (1.1) is inserted on the pin over the recess. The inner diameter of the recess is same as the outer diameter of the pin. The washer is brought against the pin in a radial direction in a tolerance-free manner. The washer comprises a flat contact surface (1.3) that is formed by flattening, cutting, edge bending or embossing the washer. A normal vector is formed on the contact surface.

Description

The The invention relates to a fastener as part of a Screw connection, wherein the fastening means with a bolt an outer diameter Da and a washer, having an inner diameter Di and a central axis M. central recess, wherein the washer on the Recess is attachable to the bolt.

It is already a fastener from the EP 0 062 271 A1 known. The fastening element has a surface coming to bear against a workpiece surface, running at right angles to the central axis M, on which a circular arc extending, coaxial to the central axis M extending bead is provided. The bead is pressed in pressing the trained as a washer fastener into the workpiece surface, so that a relative movement between the washer and the workpiece is prevented in the radial direction.

Of the Invention is the object of a fastener as To design and arrange part of a screw connection in such a way that a loosening of the screw is prevented.

Solved The object is achieved according to the invention in that the diameter Di of the recess is at most so great as the outer diameter Da of the bolt, with the washer in the radial direction backlash against the bolt to the plant brought is. Characterized in that the washer in the radial direction backlash can be brought against the bolt to the plant, is a relative movement the disc in radi aler direction to the bolt excluded, in particular even if one over the bolt and the washer clamped component on which the washer rests, relative is moved to the bolt. Using such a washer is the release of a medium on the washer or directly seated nut of the bolt prevents, as a in the radial direction relative movement between the washer and the mother is prevented. On the tightening torque of the mother it does not matter that much.

Advantageous It may also be this, if the washer has a plane contact surface wherein a normal vector which can be formed on the abutment surface N is a directional component in the circumferential direction U or in the direction has tangential to the central axis M. The contact surface ensures the formation of a positive connection between the washer and a component to be fastened, so that a relative movement between the washer and the to be fastened Component in the aforementioned direction, ie in a circumferential direction U or in the direction tangential to the central axis M, is prevented.

In In this context, it may be advantageous if the contact surface by flattening, shearing, casting, bending or embossing the washer is formed. The contact surface can in the axial direction to the central axis M via the against the Component or against the mother to be applied top or bottom protruding from the washer. The contact surface can thus via an integrally formed additional part to the washer in the form of a nose or a pin or in the form of an off or Imprint of the annular disc done.

According to the invention the use of the fastener within an assembly, wherein the Assembly is formed from a housing flange with the arranged thereon, designed as a stud bolts, one on the housing flange arranged component, one on the Stud bolts nut screwed, by means of which the component against the housing flange is biased, wherein the washer arranged on the stud between the nut and the component is. The component is mounted on the housing flange and is fastened over the stud bolt. The washer sits on the bolt on the component, being used for attachment screwed a nut and against the component and the disc the washer is biased. Between the washer and the mother can be provided more discs. A relative to the bolt extending in the radial direction relative movement between the component and the bolt can due to the play-free Do not transfer the washer to the bolt against the bolt so that a loosening of the nut is prevented. Between There is no positive engagement of the washer and the nut. The washer is, with the exception of the projecting in the axial direction, against the component to be applied stop surface flat and circular educated.

It can also be advantageous if the component has a stop surface corresponding to the contact surface of the washer, wherein the contact surface and the corresponding stop surface form a form fit between the washer and the component acting in the circumferential direction U or in the direction tangential to the center axis M. Due to the force acting in the circumferential direction positive connection between the washer and the component, a rotation of the washer relative to the component just in case is prevented. Thus, a possibly existing relative movement of the component to the stud in the circumferential direction is also not on the washer wear, so that such a relative movement can not be done between the nut and the bolt. The release of the nut is thus prevented.

there it may be advantageously provided when in the component a Nut is provided, which has the stop surface. The provided groove ensures on the one hand the invention Positive connection between the washer and the component. On the other hand Also, the relative position between the component and the stud guaranteed, as the washer so far against abuts the bolt.

From Of particular importance for the present invention be if the housing flange is part of a cylinder head is and the component of one or more parts of a manifold flange is formed. For connections between manifold flanges, subject to large variations in temperature, is the use of fasteners of the invention advantageous. By decoupling the nut from the relative movement between the component and the bolt can for tightening moments to be provided to the mother. This works positively to the sliding behavior of the manifold on the cylinder head and so can the life of the manifold crucial increase.

Further Advantages and details of the invention are in the claims and explained in the description and illustrated in the figures. It demonstrate:

1 a schematic diagram of the fasteners and the assembly without nut;

2 the assembly with nut;

3 a training variant concerning the stop surface.

In 1 illustrated fastening means 1 are part of an assembly consisting of a housing flange 2 with a stud 1.2 , where on the housing flange 2 two components 3 . 3 ' are arranged over the studs 1.2 be attached. For fixing is on the stud 1.2 a washer 1.1 as part of the fasteners 1 intended. The stud 1.2 has a central axis M and an outer diameter Da. The washer 1.1 has a concentric recess 1.4 with an inside diameter Di on. The inner diameter Di of the recess 1.4 is at most as large as the outer diameter Da of the stud 1.2 so the washer 1.1 in the radial direction to the central axis M backlash, optionally under bias against the stud 1.2 is applied.

Furthermore, the washer has 1.1 a projecting in the axial direction over the underside of the disc contact surface 1.3 . 1.3 'on, in a groove or recess 3.1 . 3.1 'of the component 3 . 3 ' is arranged. The respective groove 3.1 . 3.1 'has one with the respective contact surface 1.3 . 1.3 'corresponding stop surface 3.2 . 3.2 ', in a circumferential direction U form fit against the respective contact surface 1.3 . 1.3 'is present. The respective contact surface 1.3 . 1.3 'Is by an axially extending expression on the edge of the washer 1.1 educated.

In the embodiment according to 2 is on the stud 1.2 A mother 4 screwed over another disc 4.1 against the washer 1.1 is applied. For the purpose of training the contact surface 1.3 points the washer 1.1 a nose 1.5 on, starting from the flat shape of the washer 1.1 folded down so that the contact surface 1.3 against the stop surface 3.2 of the component 3 is applied. The contact surface 1.3 forms together with the stop surface 3.2 the force acting in the circumferential direction U positive connection between the washer 1.1 and the component 3 , In a similar way is the nose 1.5 against the corresponding stop surface 3.2 'of the second component 3 ' created. A normal vector N of the contact surface 1.3 runs at a distance a to the center axis M.

According to embodiment 3 is the contact surface 1.3 the washer 1.1 formed as a flattening. The washer 1.1 is in the groove 3.1 . 3.1 'Arranged and lies in the radial direction to the central axis M with the contact surface 1.3 against the respective stop surface 3.2 . 3.2 ' at.

1

fastener

1.1

washer

1.2

Bolt, studs

1.3

contact surface

1.3 '

contact surface

1.4

recess

1.5

nose

2

housing flange

3

component

3 '

component

3.1

groove

3.1 '

groove

3.2

stop surface

3.2 '

stop surface

4

mother

4.1

disc

a

distance

There

outer diameter

di

Inner diameter

M

central axis

N

normal vector

U

circumferentially

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

• EP 0062271 A1 [0002]

Claims (7)

Fixing means ( 1 ) as part of a screw connection, wherein the fastening means ( 1 ) a bolt ( 1.2 ) with an outer diameter Da and a washer ( 1.1 ), having an inner diameter Di and a central axis M having central recess ( 1.4 ), the washer ( 1.1 ) over the recess ( 1.4 ) on the bolt ( 1.2 ) is attachable, characterized in that the diameter Di of the recess ( 1.4 ) is at most as large as the outer diameter Da of the bolt ( 1.2 ), the washer ( 1.1 ) in the radial direction backlash against the bolt ( 1.2 ) Can be brought to the plant. Fixing means ( 1 ) according to claim 1, characterized in that the washer ( 1.1 ) a plane bearing surface ( 1.3 ), one on the contact surface ( 1.3 ) normal vector N has a direction component in a circumferential direction U or in the direction tangential to the central axis M. Fixing means ( 1 ) according to claim 1 or 2, characterized in that the contact surface ( 1.3 ) by flattening, shearing, casting, folding or embossing the washer ( 1.1 ) is formed. Assembly with the fastening means ( 1 ) according to one of claims 1 to 3, wherein the assembly is formed from a housing flange ( 2 ) arranged thereon, designed as a stud bolts ( 1.2 ), one on the housing flange ( 2 ) arranged component ( 3 ), one on the stud ( 1.2 ) screwed nut ( 4 ), by means of which the component ( 3 ) against the housing flange ( 2 ) is biased, wherein the washer ( 1.1 ) on the stud ( 1.2 ) between the mother ( 4 ) and the component ( 3 ) is arranged. Assembly according to claim 4, characterized in that the component ( 3 ) one with the contact surface ( 1.3 ) of the washer ( 1.1 ) corresponding stop surface ( 3.2 ), wherein the contact surface ( 1.3 ) and the corresponding stop surface ( 3.2 ) acting in the circumferential direction U or in the direction tangential to the central axis M positive connection between the washer ( 1 ) and the component ( 3 ) form. Fixing means ( 1 ) according to one of claims 4 to 5, characterized in that in the component ( 3 ) a groove ( 3.1 ) is provided, the stop surface ( 3.2 ) having. Fixing means ( 1 ) according to one of claims 4 to 6, characterized in that the housing flange ( 2 ) is a part of a cylinder head and the component ( 3 ) from one or more parts ( 3 . 3 ' ) of a manifold flange is formed.