DE102022103924A1 - tubular sleeve - Google Patents

Abstract

According to the invention, a tubular sleeve is provided, in particular for use as a force-absorbing sleeve. The sleeve comprises a casing wall with a through-opening, the sleeve being made of plastic, and the plastic's modulus of elasticity being between 15,000 MPa and 25,000 MPa.

Description

The present invention relates to a tubular sleeve.

In the WO 02/088555 A1 , the DE 10 2018 117 435 A1 , the WO 2019/1455553 A1 , the EP 1 205 676 A2 , the EP 1 229 257 A2 , the EP 0 163 152 A1 and the WO 00/32947 A1 describes fasteners and fastening systems with a tubular sleeve.

The object of the present invention is to provide an alternative to the sleeves known from the prior art.

Another object is to provide a sleeve that is safe and reliable in operation.

In addition, it is an object of the present invention to provide a sleeve that is easy to manufacture.

One or more of these objects are solved by the features of independent claims 1, 7, 9 and 10. Advantageous configurations are specified in the dependent patent claims.

According to the invention, a tubular sleeve is provided, in particular for use as a force-absorbing sleeve. The sleeve comprises a casing wall with a through-opening, the sleeve being made of plastic, and the plastic's modulus of elasticity being between 15,000 MPa and 25,000 MPa.

In the context of the present invention, a tubular sleeve is understood to mean a compression limiting sleeve and/or a spacer sleeve.

In the field of technology, the modulus of elasticity is also referred to as Young's modulus, tensile modulus, coefficient of elasticity, elongation modulus or Young's modulus. The modulus of elasticity is a material parameter from materials engineering that, in the case of linear-elastic behavior, describes the proportional relationship between stress and strain during the deformation of a solid body.

The modulus of elasticity of the plastic can be at least 10,000 MPa or at least 11,000 MPa or at least 12,000 MPa or at least 13,000 MPa. The modulus of elasticity of the plastic can be a maximum of 17,000 MPa or a maximum of 18,000 MPa or a maximum of 19,000 MPa or a maximum of 20,000 MPa.

A sleeve made of plastic has the advantage over sleeves made of metal that it does not cause any corrosion in a fastening area, in particular in connection with a screw made of metal.

Furthermore, a sleeve made of plastic can be produced in a simple manner, for example by means of an injection molding process.

The sleeve can have a heat deflection temperature of up to 285 °C. The functional temperature range under load can be between -40 °C and 125 °C.

In this functional temperature application range, the tubular sleeve can be heat-resistant to at least -40°C or to at least -30°C or to at least -20°C or to at least -10°C or permanently resilient. In this functional temperature application range, the tubular sleeve can be heat-resistant up to a maximum of 120° C. or up to a maximum of 115° C. or up to a maximum of 110° C. or can be subjected to continuous loads.

Thus, the tubular sleeve can be provided in particular for use in an engine compartment of a motor vehicle.

Such a temperature range corresponds to the technical requirements when using components in an engine compartment of a motor vehicle. The inventors of the present invention have recognized that metallic sleeves can also be replaced by tubular sleeves made of plastic according to the invention, which nevertheless meet the mechanical requirements and the requirements with regard to heat resistance.

The resistance of the tubular sleeve to high temperatures is referred to as heat or temperature resistance. If the temperature of the material reaches the so-called upper service temperature, the temperature-dependent properties change so much that the material no longer meets the mechanical requirements or is destroyed. The duration of the temperature effect also plays a role.

The sleeve can be used, for example, to attach a cam cover, an oil pan, an intake module or the like.

The plastic can preferably be a partially aromatic polyamide with or without a glass fiber content.

The glass fiber content can be in the range from 20% by volume to 60% by volume. The glass fiber content can be at least 5% by volume or at least 10 % by volume or at least 15 % by volume or at least 20 % by volume or at least 25 % by volume or at least 30 % by volume. In addition, the glass fiber content can be a maximum of 35% by volume or a maximum of 40% by volume or a maximum of 45% by volume or a maximum of 50% by volume or a maximum of 60% by volume or a maximum of 65% by volume. be.

The partially aromatic polyamide can be, for example, PPA, PA6/6T or PA6/6I or PA69T, PPS, PPSU, PSU or any other suitable polyphthalamide. Polyphthalamides (PPA, partially aromatic polyamides, semi-aromatic polyamides) are semi-crystalline aromatic polyamides (PA). They are semi-aromatic polyamides in which the amide groups are alternately attached to aliphatic groups (-R-) and to benzenedicarboxylic acid groups. They belong to the class of thermoplastics.

Due to its partially aromatic structure, polyphthalamide is a partially crystalline material with a high melting point and high glass transition temperature of over 150 °C. The glass transition temperature increases with the terephthalic acid content. Polyphthalamides have a high heat resistance of more than 280 °C.

The highly rigid material has high tensile strength and rigidity. The modulus of elasticity (E-modulus) of glass fiber reinforced PPAs can be up to 20,000 MPa. The notched impact strength is higher than that of comparable plastics. The constant mechanical properties with dimensional stability, only little distortion and high creep resistance allow for a wide range of applications.

In addition, the materials or plastics mentioned above, in particular PPA, can also be radiation-crosslinked.

In radiation crosslinking, a special additive is added to the raw material. After the raw material has been processed, the plastic moldings are subsequently irradiated. These rays cause chemical reactions and improve the mechanical and thermal properties of the plastic through better crosslinking (significant reduction in creep behavior, especially at high temperatures).

Furthermore, the through-opening can be designed to accommodate screws with a screw size of M5 to M8, with a prestressing force being in the range between 5 kN and 25 kN.

With a screw with a screw size M4 or smaller, the required clamping force is usually so low that often no bushing or sleeve is used. In the case of screws with a screw size larger than M8, excessive pretensioning forces would be required, so that the plastic would flow away too much with the plastic sleeve.

When using an M6 screw and a property class of 8.8. is possible with the tubular sleeve according to the invention a biasing force of about 7 to 9 kN.

• • Anzugsmoment 8 bis 10,5 Nm
• • resultierende Vorspannkraft ca. 7 bis 9kN

Data for M6/ strength class 8.8:

• • Tightening torque 8 to 10.5 Nm
• • Resulting pretensioning force approx. 7 to 9kN

• M5 - Vorspannkraft bei Festigkeitsklasse von 10.9: 10 kN
• M7 - Vorspannkraft bei Festigkeitsklasse von 10.9: 21 kN

With an M8 screw with a strength class of 10.9, a preload force of approx. 23 kN is possible.

• M5 - preload force with strength class of 10.9: 10 kN
• M7 - preload force with strength class of 10.9: 21 kN

Ribs extending in the axial direction of the sleeve can be formed on an outside of the casing wall of the sleeve.

These ribs preferably extend over almost the entire length of the sleeve in the axial direction.

The ribs can be designed to stiffen the sleeve and/or to form an anti-twist device when the sleeve is arranged in a corresponding component.

An anti-twist device is particularly advantageous in the production of a component with a sleeve according to the invention, if the sleeve and the component are produced in a 2-component injection molding process or the sleeve is mounted subsequently.

The ribs make it possible to reduce the axial load and/or increase the holding force of the sleeve in a corresponding component recess.

In the through-opening of the sleeve, a radially circumferential collar that extends inward in the radial direction can be formed for holding a screw.

Such a collar ("Bottteneck") allows a screw arranged in the through-opening of the sleeve to be secured during transport and/or a corresponding pre-assembly positioning of a screw.

At one end and/or at both ends, the sleeve can have an annular contact section extending in the radial direction.

The contact section is intended to rest on a screw head of a screw and/or on a component surface in order to distribute and dissipate the forces that occur.

Furthermore, one or more radially circumferential grooves can be provided on the casing wall.

The sleeve can be formed in two parts from two identical sleeve elements.

In the context of the present invention, two identical sleeve elements are understood to mean that they are embodied symmetrically or in an inherently complementary manner. This enables a simple structure, since the tubular sleeve can be formed from two identical parts at low cost.

In the area of the through-opening, the sleeve elements can have anti-rotation locking elements extending in an axial direction.

By providing corresponding anti-rotation elements, twisting of the two anti-rotation elements relative to one another in the axial direction is safely and reliably prevented. This enables safe and reliable use, especially when installed.

Furthermore, the sleeve elements can be connected to one another via connecting means in order to form the sleeve.

Because the sleeve elements are connected to one another via connecting means, the sleeve can be preassembled more easily.

In addition, according to the invention, a fastening system is provided with a sleeve shown above and a screw with a screw size between M5 and M8.

As shown above, with such a fastening system, screws can be arranged in the through-opening of the sleeve so that they cannot be lost (safe for transport) and/or for (pre)assembly positioning.

On a screw shank of the screw, a section with an enlarged diameter compared to the screw shank can be formed to prevent loss, the section having knurling or a ring element or a cross section that is reduced compared to the screw thread.

The screw can be arranged captively in the through-opening of the sleeve by means of a corresponding section on the screw shank with an enlarged diameter.

In addition, according to the invention, a method for mounting a component in an engine compartment of a motor vehicle is provided, with a sleeve described above being used for mounting the component.

In particular, the sleeve according to the invention is intended for applications in which the fastening means are exposed to high temperatures and/or high loads.

According to the invention, a method for producing a component in a two-component injection molding process is also provided, with a sleeve as described above having ribs extending in the axial direction of the sleeve on an outside of the jacket wall of the sleeve being injection-molded and then the sleeve being overmolded in the region of the ribs, to position them in a fixed position on a component.

Stationary positioning is preferably understood to mean a torsion-proof arrangement when overmolding the sleeves.

In this way, a component can be easily produced, with the sleeve being correspondingly securely and reliably anchored in the component.

An anti-twist device is thus formed by the ribs extending in the axial direction.

In the context of the present invention, a multi-component injection molding process is understood to mean the production of injection molded parts that consist of two or more different plastics. Different materials and thus different properties can also be combined in a targeted manner.

There are various methods, all of which have in common that injection molding machines with two or more injection units but only one clamping unit are required. The parts can thus be manufactured cost-effectively with just one tool in one operation. The injection units must work in harmony, but always be controllable independently of one another. The components can be injected through a single special nozzle or introduced into the mold at different points.

• 1 eine perspektivische Darstellung einer erfindungsgemäßen rohrförmigen Hülse,
• 2 eine weitere perspektivische Darstellung der rohrförmigen Hülse aus 1,
• 3 eine perspektivische Darstellung der rohrförmigen Hülse gemäß einem zweiten Ausführungsbeispiel,
• 4 eine weitere perspektivische Darstellung der rohrförmigen Hülse aus 3,
• 5 eine perspektivische Darstellung der rohrförmigen Hülse gemäß einem dritten Ausführungsbeispiel ,
• 6 eine weitere perspektivische Darstellung der rohrförmigen Hülse aus 5,
• 7 eine seitlich geschnittene Darstellung einer rohrförmigen Hülse gemäß einem vierten Ausführungsbeispiel,
• 8 eine perspektivische teilweise seitlich geschnittene Darstellung eines Bauteils mit einer rohrförmigen Hülse und einer Schraube aus 7,
• 9 eine perspektivische seitlich geschnittene Darstellung des Bauteils mit der rohrförmigen Hülse und einer Schraube aus 7,
• 10 eine perspektivische Darstellung einer rohrförmigen Hülse gemäß einem fünften Ausführungsbeispiel,
• 11 eine seitlich geschnittene Darstellung der rohrförmigen Hülse aus 10,
• 12 eine perspektivische Darstellung einer Schraube mit einer Verliersicherung gemäß einem ersten Ausführungsbeispiel,
• 13 eine perspektivische Darstellung einer Schraube mit einer Verliersicherung gemäß einem zweiten Ausführungsbeispiel,
• 14 eine weitere perspektivische Darstellung einer Schraube mit Verliersicherung gemäß einem dritten Ausführungsbeispiel,
• 15 eine perspektivische Darstellung einer rohrförmigen Hülse gemäß einem 6. Ausführungsbeispiel,
• 16 eine perspektivische Explosions-Darstellung der Hülse aus 15,
• 17 eine weitere perspektivische Explosions-Darstellung der Hülse,
• 18 eine perspektivische Darstellung eines Hülsenelements der rohrförmigen Hülse, und
• 19 eine perspektivische Draufsicht auf Verdrehsicherungselemente der Hülse.

The present invention is described in more detail below with reference to the exemplary embodiments illustrated in the figures. These show in:

• 1 a perspective view of a tubular sleeve according to the invention,
• 2 Another perspective view of the tubular sleeve 1 ,
• 3 a perspective view of the tubular sleeve according to a second embodiment,
• 4 Another perspective view of the tubular sleeve 3 ,
• 5 a perspective view of the tubular sleeve according to a third embodiment,
• 6 Another perspective view of the tubular sleeve 5 ,
• 7 a laterally sectioned view of a tubular sleeve according to a fourth embodiment,
• 8th a perspective partially cut side view of a component with a tubular sleeve and a screw 7 ,
• 9 a perspective laterally sectioned view of the component with the tubular sleeve and a screw 7 ,
• 10 a perspective view of a tubular sleeve according to a fifth embodiment,
• 11 Figure 12 shows a side sectional view of the tubular sleeve 10 ,
• 12 a perspective view of a screw with a captive device according to a first embodiment,
• 13 a perspective view of a screw with a captive device according to a second embodiment,
• 14 another perspective view of a screw with captive according to a third embodiment,
• 15 a perspective view of a tubular sleeve according to a 6th embodiment,
• 16 an exploded perspective view of the sleeve 15 ,
• 17 another perspective exploded view of the sleeve,
• 18 a perspective view of a sleeve element of the tubular sleeve, and
• 19 a perspective plan view of anti-rotation elements of the sleeve.

In the following, a tubular sleeve 1 according to the invention is briefly described according to a first embodiment ( 1 and 2 ). The technical features of the exemplary embodiments can be combined with one another in any way that is technically possible.

The tubular sleeve 1 is intended for use as a force-receiving sleeve.

In addition, the tubular sleeve is made of a plastic that relaxes only slightly in a temperature range from -40.degree. C. to 125.degree. Temperatures of -40 °C to 125 °C can usually occur in the engine compartment of an automobile. This corresponds to the usual temperature ranges for an engine compartment of an automobile.

The tubular sleeve 1 has a base body with a jacket wall 2, in which a through-opening 3 extending in an axial direction 17 is formed.

At one end of the base body of the sleeve 1 there is an approximately annular contact section 4 for contact with a component surface or a screw head.

Furthermore, ribs 6 extending outwards in the radial direction and running in the longitudinal direction are provided on the casing wall 2 .

A tubular sleeve 1 according to a second exemplary embodiment is described below ( 3 and 4 ). Unless otherwise described, the tubular sleeve 1 according to the second embodiment has the same technical features as the tubular sleeve 1 according to the first embodiment.

According to the second exemplary embodiment, it is provided that the tubular sleeve 1 has a contact section 4 on both ends lying in the axial direction 5 .

A tubular sleeve 1 according to a third exemplary embodiment is briefly described below ( 5 and 6 ). Unless otherwise described, the tubular sleeve according to the third embodiment has the same technical features as the tubular sleeves 1 according to the first and second embodiments.

The tubular sleeve 1 according to the third embodiment is designed like the tubular sleeve 1 according to the first embodiment, no ribs are provided on the jacket wall 2 and this is accordingly flat or smooth.

Furthermore, a fastening system 7 is provided according to the invention ( 8th and 9 ). The fastening system comprises a tubular sleeve 1 ( 7 ) and a screw 8, which can be arranged in a corresponding component 13.

It is provided in particular that the tubular sleeve 1 is arranged in a through-opening of the component 13 . According to a particularly advantageous embodiment, it can be provided that the tubular sleeve 1 and the component are produced in a 2-component injection molding process.

A tubular sleeve 1 according to a fourth exemplary embodiment is briefly described in more detail below ( 7 until 9 ).

The tubular sleeve 1 according to the fourth exemplary embodiment essentially corresponds to the tubular sleeve according to the first exemplary embodiment, a radially circumferential collar 9 extending inward in the radial direction for holding a screw 8 being formed in the through-opening 3 .

The collar 9, in conjunction with a correspondingly designed screw, forms a loss or transport safeguard for a screw.

Furthermore, the sleeve 1 has, at an end opposite the contact section 4 , an annular stop section 24 that runs radially around the circumference and extends in the direction of the through-opening. This stop section forms an axial limit tongue for a screw 8 accommodated in the through-opening 3 .

In the 10 and 11 a tubular sleeve 1 according to a fifth embodiment is shown, which corresponds approximately to the tubular sleeve 1 according to the first embodiment.

In addition, the stop section 24 is formed in the area of the contact section 4 .

A section 11 with a larger diameter than the screw shank 10 can be formed on the screw 8 to prevent loss ( 12 until 14 ).

The section 11 can be designed, for example, as an annular section 11 extending in the radial direction ( 12 ).

Furthermore, the section 11 can also have knurling ( 13 ).

In addition, there is also the possibility that the section 11 is a section of the screw shank 10 which has a reduced diameter compared to a threaded section 12 .

In the following, a tubular sleeve 1 according to a sixth embodiment ( 15 until 19 ) described. If technically possible and unless otherwise described, this tubular sleeve 1, like the tubular sleeves 1 described above, can also have all the technical features of the exemplary embodiments of the present invention described above. The same technical features are provided with the same reference symbols.

According to the sixth embodiment, the tubular sleeve 1 is formed from two symmetrically formed sleeve elements 14,15.

The sleeve elements 14, 15 comprise a base wall 16 in the shape of a circular ring. The base wall 16 can, for example, form a contact section 4 as described above.

Furthermore, the through opening 3 is formed in the base wall 16 .

In the area of the through-opening 3 , anti-rotation locking elements 18 , 19 are formed diametrically opposite one another and extending in an axial direction 17 . The anti-rotation elements 18, 19 are designed in the form of a segment of a circular ring in a plan view from above. Each anti-rotation element 18, 19 extends over an angular range of 90°.

The two sleeve elements 14, 15 can be connected to one another via connecting means in order to form the tubular sleeve 1.

Conical pegs or pins 21 or technically similar-acting webs can be provided as connecting means 20 . In the present exemplary embodiment, the connecting means 20 are designed as conically tapering pins, which extend in an axial direction 17 and are integrally formed on the anti-twist protection elements 18 , 19 .

Corresponding, preferably conical, connecting recesses 22 are formed in the annular base wall 15, 16 in the area centrally between the two anti-rotation elements 18, 19.

The connecting recesses 22 are designed to correspond to the pins 21, with a slight press fit or a predetermined oversize being provided here in order to connect the two sleeve elements 14, 15 to one another.

Furthermore, rib sections 23 extending outwards in the radial direction can be formed on the anti-rotation elements 18, 19, which technically have the same effect as the ribs 6 described in the above exemplary embodiments.

Furthermore, according to the invention, a method for mounting a component in the engine compartment of a motor vehicle is provided, with a sleeve 1 according to the invention being used for mounting the component.

In addition, a method for producing a component in a 2-component injection molding process is provided, with a sleeve according to the invention first being produced by means of a first injection molding process and then a component 13 being formed at least partially or completely by overmolding the jacket wall 2 of the tubular sleeve 1.

Reference List

1

tubular sleeve

2

shell wall

3

passage opening

4

investment section

5

axial direction

6

ribs

7

fastening system

8th

screw

9

collar

10

screw shank

11

section

12

thread

13

component

14

sleeve element

15

sleeve element

16

base wall

17

axial direction

18

anti-rotation element

19

anti-rotation element

20

lanyard

21

pins

22

connection recess

23

rib section

24

stop section

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• WO 02/088555 A1 [0002]
• DE 102018117435 A1 [0002]
• WO 2019/1455553 A1 [0002]
• EP 1205676 A2 [0002]
• EP 1229257 A2 [0002]
• EP 0163152 A1 [0002]
• WO 0032947 A1 [0002]

Claims (10)

Tubular sleeve, in particular for use as a force-absorbing sleeve, with a jacket wall and a through-opening, the sleeve being made of plastic, and the plastic having a modulus of elasticity between 15,000 MPa and 25,000 MPa. Tubular sleeve according to claim 1 , characterized in that the sleeve is heat-resistant in a temperature range from -40 °C to 125 °C. Tubular sleeve according to claim 1 or 2 , characterized in that the plastic is a partially aromatic polyamide, such as PPA, PA6/6T, PA6/9T or PA6/6I), PPS, PPSU, PSU, with or without glass fiber content, the glass fiber content preferably being between 20% by volume and 60% by volume. Tubular sleeve according to one of Claims 1 until 3 , characterized in that the sleeve is formed in two parts from two identical sleeve elements. Tubular sleeve according to one of Claims 1 until 4 , characterized in that the sleeve elements in the region of the through-opening have anti-rotation locking elements extending in an axial direction. Tubular sleeve according to one of Claims 1 until 5 , characterized in that the sleeve elements are connected to one another via connecting means in order to form the sleeve. Fastening system comprising a sleeve according to one of Claims 1 until 6 and a screw with a screw size between M5 and M8 Fastening system according to claim 7 , characterized in that on a screw shank of the screw a section is formed with an enlarged diameter compared to the screw shank to prevent loss, the section having knurling or a ring element or a thread. Method for mounting a component in an engine compartment of a motor vehicle, wherein for mounting the component a sleeve according to one of Claims 1 until 6 is used. A method for producing a component in a 2-component injection molding process, wherein first a sleeve according to one of Claims 1 until 6 is injection molded with ribs extending in the axial direction of the sleeve on an outside of the jacket wall of the sleeve and then the sleeve is overmoulded in the region of the ribs in order to position it stationary on a component.

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