DE102009007048A1 - Bearing unit e.g. rotary bearing, for e.g. door, has seal produced in sandwich injection molding process such that core is completely closed by coating, where seal cooperating with core is fixed at guide rail or carriage or ring devices - Google Patents

Abstract

The unit has a guide rail (51), a carriage (52), an inner ring device and an outer ring device moved relative to each other by interconnection of a rolling body device (41) and a sliding guide device. A longitudinal sealing (10l) has a seal with a core made of hard plastic and a coating made of soft plastic. The seal is produced in a sandwich injection molding process such that the core is completely closed by the coating. The seal cooperating with the core is fixed at the guide rail or the carriage or the ring devices.

Description

The The invention relates to a seal according to the preamble of claim 1, which has a hard carrier and an im Compared to this soft sealing area.

Such a seal is from the DE 26 05 072 known. In this known seal the sealing area of the carrier is the side with a constant wall thickness, ie with a constant thickness away. A constriction is not present at the transition from the carrier to the sealing area.

From the DE 2 157 015 A1 is a seal made of a sprayable material, in particular plastic or rubber, which is produced in a single operation in an injection mold. The hard carrier and the soft compared to the carrier sealing area consist in this known seal from different sprayable materials that are connected together in the hot plastic state. In this case, the hard carrier made of a sprayable fiber-reinforced material and the soft sealing region made of a sprayable material without fiber reinforcement. Likewise, it is possible that the fiber concentration in the material for the hard carrier is substantially higher than in the material for the sealing lip forming a sealing region.

The DE 1 992 303 U1 discloses a rolling bearing seal, which consists of a metallic support body and a sealing disc connected to this made of elastic, oil-resistant material, such as rubber, plastic or the like. This known rolling bearing seal is used for fastening in a groove of a bearing ring, which bears sealingly with its free end on a shoulder, groove or the like of the opposite other bearing ring.

A rolling bearing seal, which consists of a sealing body of elastic material and a metal body embedded therein, is made of DE 195 27 340 B4 known. The sealing body has a nose for forming a sliding contact with a sealing surface formed in a bearing ring of the bearing. The nose has a vertical area and an inclined, frusto-conical area as a contact element. The inclined portion is bounded by an outer end surface and an inner surface inclined thereto. This known rolling bearing seal is used for example in solenoid or magnetic clutches for automotive air conditioning systems for use, it has the desired waterproofness even under difficult conditions.

A longitudinal seal for a linear guide, with an elongated hard carrier, ie a carrier made of a comparatively hard plastic, and with a compared to this soft sealing region, ie an elongated sealing lip of a relatively soft plastic, is from the DE 10 2007 008 052 A1 the applicant known. In this known longitudinal seal, the sealing lip along an interface to the support is formed such that the sealing lip and the carrier are positively connected to each other by at least one closed material entanglement.

Of the Invention is based on the object, a seal of the initially mentioned type to create, with a very low height can be dimensioned, with the hard carrier very close on the soft and with a sufficient wall thickness dimensioned Sealing area can be brought so that optimal Gasket properties revealed.

These The object is achieved by the features of claim 1, d. H. solved that the transition between the hard carrier and the soft sealing area with at least one of the penetration of the fillers during the injection process at least for the most part obstructing or preventing constriction is formed, which is a constriction forms. This can be the transition between the carrier and the sealing area with a constriction or at least be formed two constrictions, which the material constriction form. These at least two holds can in the transition between the carrier and the sealing area lie opposite or opposite and against each other be laterally offset to a meandering, in its cross section reduced transition between the Carrier and the sealing area to realize. Independently From the number of constrictions may be the sealing area dimensioned with a sufficient wall thickness and with a thickening be educated.

expedient it may be in the seal according to the invention, if the fillers have such a geometry, that during the spraying process the at least one Material flow constriction not or only in limited quantity, in the sealing area into it, can happen. For this purpose can the fillers have such a size, that during the spraying process the at least one Material flow restriction not or only in limited quantity, in the Sealing area into it, can happen.

at The fillers mentioned may be mineral Substances or to act on organic matter. The fillers can be made of glass fibers, glass beads, carbon fibers or the like consist.

to further optimization of the mechanical strength properties of The seal according to the invention can be the hard carrier be combined with a dimensionally stable core part. It can the Carrier enclose the dimensionally stable core part at least partially. Likewise it is possible that the carrier and the dimensionally stable core element by at least one Materialverschlaufung are positively connected with each other. Another one Possibility is that the carrier of the seal according to the invention to a structural part made of a hard material, in particular a hard plastic, is injected. In such a training of the latter Type can be the beam and the structural part by at least one material entanglement with each other form-fitting be connected.

According to the invention It is also possible that the carrier and the structural part are produced in a multi-component injection molding process.

The Construction part consists, for example, of PA or POM. Of course Other plastic materials are also applicable.

According to the invention the seal according to claim 14 also from a mixture of at least two plastics, wherein at least the hard carrier contains fillers, which are coupled to the plastic of the carrier. To For this purpose can be used as coupling adhesion promoter, z. As silanes are used, due to their special structure the adhesion between organic and inorganic materials is significant improve. This is usually a chemical bond between organic and inorganic matrix achieved via the silane. Silanes are available in the market in a variety of products.

at a seal according to the invention of the latter Type, the sealing area consists of a plastic, no or only a comparatively small coupling to the fillers has. The plastics can have the same viscosity or have different viscosities. Im last it is expedient if the viscosities the plastics are coordinated. expedient it is, if not only the viscosities of the plastics but when the plastics are on top of each other have agreed tolerances.

Of the hard carrier can in the inventive Seal brought very close to the soft sealing area be so that the hard carrier the soft sealing area Well supported, ensuring optimum sealing properties possible are. The sealing properties can also be optimized by the fact that the sealing area no constant wall thickness has, but a thickening o. The like. Is formed.

about the fillers are in a one-component manufacturing process optimum sealing properties and optimum mechanical support properties realizable. In a single manufacturing process are over different or the same plastics with different Couplings to the fillers in by injection molding produced seal the fillers defined positionable. In the seal according to the invention, the soft sealing area of the hard carrier neither by temperature effects still be solved by chemicals in an undesirable manner. Likewise, abrasive effects of the fillers are in the sealing area locked out. Through the one-component production process, d. H. by the one-component injection molding, are problem-free inventive seals with very low Heights can be realized.

at The various versions can be used as thermoplastic Plastic thermoplastic elastomers or other thermoplastic Plastics, eg. As polyamides, are used or other thermoplastic processable molding compounds, d. H. if in the present application Plastic is mentioned, so are all other thermoplastic processable molding compositions.

use can find the seal of the invention as Sealing element for various guiding devices and bearings, preferably rolling bearings. It can be about stock According to claim 21, acting as a pivot bearing according to claim 22 or as a linear bearing according to claim 24 may be formed.

at the pivot bearings can be provided that the sealing element as an annular and / or flat-ring-shaped body formed is and a soft sealing area of the radially inner edge of the body and / or a soft sealing region of the radially outer Edge of the body as the sliding guided sealing area is trained.

at The liner bearings can one or more seals than Abstreifdichtungen be formed. It can be provided here be that the sealing element is designed as a wiper seal, which has a flat, preferably flap-shaped body, which is parallel to an end face of the carriage and / or perpendicular extends to the direction of movement of the carriage, wherein the soft sealing area of the free edge of the body on a parallel to the direction of movement of the carriage extending surface the rail transversely to the longitudinal extent of the free edge region Slidably guided by the body.

Further can also be longitudinal seals in the linear bearings be used. It can be provided that the sealing element is designed as a longitudinal seal having a flat, preferably flap-shaped Body has, which is parallel to the direction of movement the carriage extends, wherein the soft sealing area of a free Border area of the body on a surface of the Rail along the extension direction of the rail and along the Longitudinal extension of the free edge area of the body is guided in a sliding manner.

at all the designs as rolling bearings can as rolling elements balls, cylinder bodies, Needles or other known rolling elements be used. Essential for all guides and bearing designs is in each case that seals according to the invention the basic structure according to claim 1 are used.

Further Details, features and advantages will be apparent from the following Description of illustrated in the drawings embodiments of seal according to the invention.

It demonstrate:

1 a perspective view of a seal, which is designed as a ring seal for a roller bearing,

2 a section along the section line II-II in 1 through the ring seal,

3 a schematic cross-sectional view of an embodiment of the seal according to the invention,

4 one of the 3 similar schematic cross-sectional view of another embodiment of the seal according to the invention,

5 yet another schematic cross-sectional view of a seal according to the invention,

6 3 is a schematic representation of a three-dimensional representation of a seal according to the invention with a dimensionally stable core element,

7 a cross section through a seal according to the invention, which is combined with a mechanical reinforcement forming construction part, and

8th in perspective, a portion of a seal according to the invention - similar to the 7 in a cross-section seal - to illustrate material entanglements between the seal and the structural part;

9 an embodiment of a trained as a pivot bearing unit;

10 an embodiment of a trained as a linear bearing unit.

The 1 and 2 illustrate an education of the seal 10 , The seal 10 is designed as a ring seal for a rolling bearing, it has a hard carrier 12 and one compared to this soft sealing area 14 on. The seal 10 consists of a single thermoplastic elastomer 16 that with fillers 18 is provided. In the seal according to the invention 10 are the fillers 18 predominantly or exclusively in the carrier 12 intended. In the sealing area 14 is at most a small amount of fillers 18 or it's in the sealing area 14 no fillers at all 18 present, so that the sealing area 14 compared to the carrier 12 is elastic soft.

The soft sealing area 14 is as a sealing bead 20 formed in a central area inside the seal 10 running around.

3 shows schematically, that is not true to scale, in a cross-sectional view of an embodiment of the seal 10 with a hard carrier 12 and a soft sealing area 14 where the hard carrier 12 has a rectangular cross section and the soft sealing area 14 as a sealing lip 22 is trained. The transition 24 between the carrier 12 and the sealing area 14 is with a material flow constriction 26 formed, which forms a constriction, which is dimensioned such that the fillers 18 during the injection molding process to make the seal 10 at a penetration into the soft sealing area 14 be prevented.

With the reference number 16 is also in 3 the thermoplastic elastomer material designates the fillers 18 contains.

The fillers 18 in the thermoplastic elastomer 16 have such a geometry or size that they during the injection molding process, the constriction forming a constriction 26 in transition 24 between the carrier 12 and the sealing area 14 can not happen. The fillers 18 cause the hardness of the wearer 12 , The absence of fillers 18 in the sealing area 14 results in the softness and elasticity of the sealing area 14 ,

The 4 clarified in one of the 3 similar schematic and not to scale representation in cross section, an embodiment of the seal 10 , where the transition 24 between the hard carrier 12 and the soft sealing area 14 with two against each other laterally offset Einschnü ments formed, the material flow constrictions 26 form.

Same details are in 4 with the same reference numerals as in 3 referred, so that it is unnecessary, in connection with 4 to describe all the details again in detail.

5 schematically illustrates a cross-sectional representation of a design of the seal 10 in which the hard carrier 12 with a dimensionally stable core part 28 combined. The core part 28 may have a solid cross-section or - from a weight reduction point of view - a hollow cross-section.

In this training of the seal 10 indicates the soft sealing area 14 a pair of sealing lips 22 on the hard carrier 12 are spaced by constrictions that face each other and a material flow constriction 26 form.

With the reference number 18 are called fillers, especially in the hard carrier 12 are located. In the soft sealing area 14 There are a few fillers 18 , With the reference number 16 is also in 5 the thermoplastic elastomer material referred to, with the fillers 18 is provided.

6 schematically illustrates in a perspective view of an embodiment of the seal 10 as a longitudinal seal for a linear guide, the hard carrier 12 a dimensionally stable core part 28 flows around, which has a solid cross-section and with recesses 30 is designed to be the hard carrier 12 and the dimensionally stable core element 28 through material entanglements 32 to connect form-fitting with each other.

On the presentation of fillers 18 is in 6 has been dispensed with.

The seal 10 has one from the hard carrier 12 away standing sealing lip 22 which has a beaded cross section and no fillers or only one compared to the filler content of the hard carrier 12 contains very small amount of fillers. For this purpose, the transition 24 between the hard carrier 12 and the soft sealing area 14 that of the sealing lip 22 is formed, is formed with at least one constriction, which has a suitably dimensioned material flow constriction 26 forms.

7 shows in one of the 2 in principle similar cross-sectional representation - has been dispensed with the representation of the fillers - a formation of the seal 10 where the hard carrier 12 the seal 10 with a construction part 34 is materially connected. The construction part 34 For example, it is made of a hard plastic material that attaches to the hard carrier 12 For example, in a multi-component injection molding process is injected. Another possibility of the positive connection of the structural part 34 made of hard plastic with the hard carrier 12 the seal 10 is through the realization of material entanglements 32 possible as they are in 8th are clarified. Regarding such Materialverschlaufungen 32 is on the cited above DE 10 2007 008 052 A1 referenced, the disclosure of which belongs to the content of the present invention.

9 shows a designed as a pivot bearing unit. The pivot bearing is a rolling bearing 40 with one as outer ring 43 trained first bearing part and one as inner ring 44 formed second bearing part, wherein the two bearing parts with the interposition of rolling elements 41 guided on these are movable relative to each other. The in the in 9 shown embodiment designed as balls rolling elements 41 are through a rolling element cage 42 kept at a distance. In the two axial end portions of the outer ring 43 are essentially annular rolling bearing seals 10w arranged, wherein the rolling bearing seals 10w like the seals described above 10 have a hard carrier area and a soft sealing area. The hard carrier region and the soft sealing region can be realized by different distribution of the fillers as in the previously described embodiments. The rolling bearing seals 10w in 9 Cover the between the outer ring 43 and the inner ring 44 formed gap region and slide with the designed as a soft sealing region inner annular portion on a corresponding end face portion of the inner ring 44 , This soft sealing area slides in this embodiment in 9 on an annular step of the inner ring 44 ,

The in the embodiment in 9 used seal 10w is flat ring shaped. The radially outer edge region is in a radial annular groove of the outer ring 43 plugged in. The hard carrier in the edge region of the seal allows a tight fit in the annular groove. The radially inner edge region of the seal 10w is designed as a soft sealing area.

10 shows one as a linear bearing 50 trained storage unit. In the linear bearing 50 it is a recirculating ball bearing guide, with a guide rail 51 trained first bearing part and one as a carriage 52 formed second bearing part, wherein the two bearing parts with the interposition of balls 41 as rolling elements these guided relative to each other are movable. The guide rail 51 has on both transverse sides in cross section circular arc-shaped linear guide grooves and complementary thereto on the inner sides of the carriage 52 arranged guide grooves, in which the balls 41 roll off. The balls 41 are, as in 10 to see guided in a recirculating ball, wherein the ball circulation by deflecting / end caps 53 is closed.

A flap-shaped wiper seal 10a is always on the free end faces of the carriage 52 arranged. It is with its flat side on the end face of the carriage 52 surface-mounted fixed and slides with the trained in their free edge area soft sealing area over the top of the guide rail 51 , The direction of sliding movement runs perpendicular to the longitudinal edge of the edge forming the sealing area. The wiper seal 10a Slips on the top of the guide rail during the sliding movement 51 deposited dirt particles or liquid or pasty dirt and holds lubricants, such as greases or oils in the area of the carriage.

A likewise formed as a flat flap-shaped body longitudinal seal 10l engages under the carriage 52 and slides with an edge formed as a soft sealing area over one on the guide rail 51 formed below the ball guide contact surface. The sliding movement runs along the longitudinal edge of this sealing edge region.

In the illustrated embodiment, the wiper seal 10a and the longitudinal seal 10l each formed with a hard carrier and a soft sealing area, according to the preceding embodiments of the 1 to 8th are designed specifically with different distribution of fillers. The fixation of the seal on the front side or the underside of the carriage 52 takes place by cooperation with the hard carrier of the seal, z. B. by reaching through a fastener or plugging into a holder. The sealing area forms the free edge of the seal by the soft sealing area of this edge is formed as a sealing lip.

10

poetry

10a

wiper seal

10l

longitudinal seal

10w

Rolling seal

12

hard carrier (from 10 )

14

soft sealing area (from 10 )

16

thermoplastic elastomer

18

Fillers (in 16 )

20

Sealing bead (from 10 by 14 )

22

Sealing lip (from 10 by 14 )

24

Transition (between 12 and 14 )

26

Material flow constriction (at 24 )

28

Core element (in 12 )

30

Recess (in 28 )

32

Material entanglement (between 12 and 28 )

34

Construction part (from 10 at 12 )

40

pivot bearing

41

rolling elements

42

Rolling Element

43

outer ring

44

inner ring

50

linear bearings

51

guide rail

52

carriage

53

Deflection / end cap

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 2605072 [0002]
• - DE 2157015 A1 [0003]
• - DE 1992303 U1 [0004]
• - DE 19527340 B4 [0005]
• - DE 102007008052 A1 [0006, 0049]

Claims (26)

Seal that is a hard carrier ( 12 ) and compared to this soft sealing area ( 14 ), wherein the seal ( 10 ) from a single one with fillers ( 18 ) provided thermoplastic ( 16 ), the fillers ( 18 ) predominantly or exclusively in the hard carrier ( 12 ) and at most in a small amount in the soft sealing region ( 14 ) available; characterized in that the transition ( 24 ) between the hard carrier ( 12 ) and the soft sealing area ( 14 ) with at least one of the advance of the fillers ( 18 ) in the soft area ( 14 ) is formed during the injection molding process at least largely obstructing or preventing constriction, the material flow constriction ( 26 ). Seal according to claim 1, characterized in that the fillers ( 18 ) have such a geometry that during the injection molding process they have the at least one material flow constriction ( 26 ) or only in a limited amount in the soft sealing area ( 14 ) can happen. Seal according to claim 2, characterized in that the fillers ( 18 ) have such a size that during the injection molding process they have the at least one material flow constriction ( 26 ) or only in a limited amount in the sealing area ( 14 ) can happen. Seal according to one of claims 1 to 3, characterized in that the fillers ( 18 ) are mineral substances. Seal according to one of claims 1 to 3, characterized in that the fillers ( 18 ) are organic substances. Seal according to one of claims 1 to 3, characterized in that the fillers ( 18 ) Glass fibers, glass beads or carbon fibers. Seal according to one of claims 1 to 6, characterized in that the hard carrier ( 12 ) with a dimensionally stable core element ( 28 ) is combined. Seal according to claim 7, characterized in that the hard carrier ( 12 ) the dimensionally stable core element ( 28 ) at least partially encloses. Seal according to claim 7 or 8, characterized in that the hard carrier ( 12 ) and the stable core element ( 28 ) by at least one material entanglement ( 32 ) are positively connected with each other. Seal according to one of claims 1 to 9, characterized in that the hard carrier ( 12 ) to a structural part ( 34 ) is molded from a hard plastic material. Seal according to claim 10, characterized in that the hard carrier ( 12 ) and the structural part ( 34 ) by at least one material entanglement ( 32 ) are positively connected with each other. Seal according to claim 10 or 11, characterized in that the hard carrier ( 12 ) and the structural part ( 34 ) are produced in a multi-component injection molding process. Seal according to one of claims 10 to 12, characterized in that the structural part ( 34 ) consists of PA or POM. Seal according to the preamble of claim 1, characterized in that the seal ( 10 ) consists of a mixture of at least two plastics, at least the hard carrier ( 12 ) Fillers ( 18 ) attached to the plastic of the carrier ( 12 ) are coupled. and that the soft sealing area ( 14 ) consists of a plastic, the no coupling or only a relatively small coupling to the fillers ( 18 ) owns. Seal according to claim 14, characterized in that the plastics for the hard carrier ( 12 ) and for the soft sealing area ( 14 ) have the same viscosity. Seal according to claim 14, characterized in that the plastics for the hard carrier ( 12 ) and for the soft sealing area ( 14 ) have different viscosities. Seal according to claim 16, characterized in that the viscosities of the plastics for the hard carrier ( 12 ) and for the soft sealing area ( 14 ) are coordinated. Seal according to one of claims 14 to 17, characterized in that the plastics for the hard carrier ( 12 ) and for the soft sealing area ( 14 ) have compatible compatibilities. Seal according to one of claims 1 to 18, characterized in that the seal ( 10 ) is designed as a longitudinal seal for a linear guide or as a wiper seal. Seal according to one of claims 1 to 18, characterized in that the seal ( 10 ) is designed as a ring seal for a rolling bearing. Bearing unit with rolling elements ( 41 ), a first bearing part ( 43 . 51 ), a second bearing part ( 44 . 52 ) and a sealing device, wherein the two bearing parts ( 43 . 44 . 51 . 52 ) with the interposition of the rolling elements ( 41 ) are guided relative to each other on this led and the sealing device between the first bearing part ( 43 . 51 ) and the second bearing part ( 44 . 52 ) seals, characterized in that the sealing device at least one sealing element ( 10a . 10l . 10w ), which is designed as a seal according to one of the preceding claims and in cooperation with the hard carrier on the one of the two bearing parts ( 43 . 44 . 51 . 52 ) is fixed and is slidably guided with the soft sealing region on the respective other bearing part or a motion-connected part. Bearing unit according to claim 21, characterized in that the bearing unit as a pivot bearing ( 40 ) is formed while the first bearing part ( 43 ) as outer ring means and the second bearing part ( 44 ) is formed as an inner ring means and the sealing element ( 10w ) is fixed to the outer ring means or to the inner ring means or is fixed to both the outer ring means and on the inner ring means such a sealing element. Bearing unit according to claim 22, characterized in that the sealing element ( 10w ) is formed as an annular and / or flat ring-shaped body and the soft sealing region of the radially inner edge of the body and / or the soft sealing region of the radially outer edge of the body is designed as the sliding guided sealing region. Bearing unit according to claim 21, characterized in that the bearing unit as a linear bearing ( 50 ), wherein the first bearing part as a rail ( 51 ) and the second bearing part as a carriage ( 52 ) is formed and the sealing element ( 10a . 10l ) on the rail ( 51 ) or on the carriage ( 52 ) or on the rail ( 51 ) as well as on the carriage ( 52 ) Such a sealing element is fixed. Bearing unit according to claim 24, characterized in that the sealing element as a wiper seal ( 10a ) is formed, which has a flat, preferably flap-shaped body which is parallel to an end face of the carriage ( 52 ) and / or perpendicular to the direction of movement of the carriage ( 52 ), wherein the soft sealing region of the free edge region of the body on a parallel to the direction of movement of the carriage ( 52 ) extending surface of the rail ( 51 ) is slidably guided transversely to the longitudinal extent of the free edge region of the body. Bearing unit according to claim 24 or 25, characterized in that the sealing element as a longitudinal seal ( 10l ) is formed, which has a flat, preferably flap-shaped body which is parallel to the direction of movement of the carriage ( 52 ), wherein the soft sealing region of a free edge region of the body on a surface of the rail ( 51 ) along the extension direction of the rail ( 51 ) and slidably guided longitudinally to the longitudinal extent of the free edge region of the body.