DE102018218266A1 - Inner part for a molecular joint of a suspension arm - Google Patents

Abstract

The invention relates to an inner part (10) for a molecular joint (11) of a chassis control arm (12). The inner part (10) has a ball piece (13) extending in its axial direction (a) with an, at least essentially, spherical bearing area (14), which is encircled by a one-piece elastomer body (15). The inner part (10) is characterized by the fact that, when viewed in the axial direction (a) of the ball piece (13), on both sides of the spherical bearing area (14) there is one sealing surface (18) that surrounds the ball piece (13) in the shape of a cylinder jacket and is also unprocessed. is arranged. The two sealing surfaces (18) are suitable for preventing the unintentional leakage of an initially thin elastomer mass when the elastomer body (15) is produced in an elastomer injection molding process Method for producing an inner part (10) for a molecular joint (11).

Description

The invention relates to an inner part for a molecular joint of a suspension arm and a suspension arm with a molecular joint, and to a method for producing an inner part for a molecular joint, according to the preambles of the independent claims.

Molecular joints, which are also referred to as claw joints, are known from the prior art and have a housing and an inner part, the inner part being fixed in the housing in the installed state under pretension. The housing itself is usually part of a suspension arm. The inner part contains a ball piece extending in its axial direction, which acts as an axis of the molecular joint. The ball piece has an, at least substantially, spherical bearing area, which is encircled by a one-piece elastomer body. The ball piece can be moved relative to the housing under the action of force, the material of the elastomer body having restoring properties which bring about a return of the ball piece to its undeflected zero position after the application of the force. Molecular joints are frequently used in motor vehicles, in particular commercial vehicles for the transport of people and / or goods, and there they connect, for example, chassis control arms to a vehicle frame. In the installed state, the elastomer body compensates for axial and / or radial and / or torsional and / or cardanic pivoting of the ball piece relative to the accommodating housing by molecular deformation. In this way, for example, a rigid axle can be articulatedly connected to a vehicle frame via chassis links which are provided with molecular joints.

From the DE 41 38 582 C1 A molecular joint, known as a spherical plain bearing, is known for mounting drivers in motor vehicles. The molecular joint has a housing and a ball piece referred to as a metallic inner part, and an elastomer body arranged between the two. In an assembled state, the elastomer body is clamped axially between two sheet metal rings, which are also referred to as support rings. The ball piece has an essentially spherical bearing area in its axial center, which is encircled in a ring by the one-piece elastomer body.

Such elastomer bodies are generally manufactured in series production using the elastomer injection molding process. Elastomers are very thin in the flow area and have a very low viscosity in this state. It is therefore necessary that sealing surfaces on the ball-piece side on both sides of the spherical bearing area have a relatively high dimensional accuracy and, at the same time, also a relatively high surface quality in order to prevent the elastomer compound, which is very thin in this state, from escaping during the elastomer injection molding. Spherical pieces, which are designed as forged parts, in particular drop-forged parts, and have a relatively low dimensional accuracy and surface quality due to production, can therefore not be left in the raw state in the area of the sealing surfaces. Rather, subsequent machining, usually turning, of the sealing surfaces is required in order to achieve the required dimensional accuracy and surface quality. However, this processing represents an additional work step, which is associated with a corresponding effort.

The object of the invention is to provide an inner part for a molecular joint of a suspension arm, in which an alternative embodiment of the inner part means that machining of the sealing surfaces can be dispensed with.

This object is achieved according to the present invention by an inner part with the features of independent claim 1.

Preferred embodiments and developments are the subject of the dependent claims. Further features and details of the invention emerge from the description and from the drawing figures.

The invention accordingly provides an inner part for a molecular joint of a suspension arm. The inner part has a ball piece extending in its axial direction with an, at least essentially, spherical bearing area. The storage area is encircled by an integral elastomer body. According to the invention, when viewed in the axial direction of the ball piece, on both sides of the spherical bearing area, one sealing surface is arranged, which is circumferential and at the same time unprocessed, in the form of a cylinder jacket, the two sealing surfaces being suitable for producing an unwanted leakage when the elastomer body is produced in an elastomer injection molding process first to prevent low-viscosity elastomer mass.

The two unprocessed sealing surfaces are, in particular, surfaces which remain in their raw state, the raw state being generated in particular by primary shaping or shaping. In particular, the sealing surfaces are not surfaces of the actual ball piece. The ball piece is preferably a reshaped spherical piece, in particular a spherical piece produced by a solid forming. The ball piece is preferably a forged part, in particular a drop-forged part. Alternatively, a cast part is also conceivable. In particular, an outer peripheral surface of the ball piece remains in an unprocessed raw state in the region of the two sealing surfaces. In the case of a forged ball piece, this has the advantage that a cutting through of the supporting material fibers by a machining operation is avoided, and the advantage of forging, namely the continuous, uninterrupted material fibers, is retained. Even with cast spherical pieces, it is advantageous if they can remain in their raw state and a so-called cast skin can remain intact. For the load-bearing capacity of ball pieces during driving operation, it is particularly advantageous if the outer peripheral surface of the ball piece lying in the area of the two sealing surfaces, i.e. in each case next to the spherical bearing area, can remain in an undamaged raw state, because increased stresses occur here during driving operation. If, on the other hand, machining of the ball piece at one or two fastening areas (s) arranged axially at the end is necessary, this should be regarded as uncritical with regard to the strength properties of the ball piece.

The sealing surfaces advantageously also represent outer circumferential surfaces of sealing volumes, each of which surrounds the spherical piece in a ring. In particular, the inner part has exactly two sealing volumes. The sealing volumes preferably each bear directly on an outer peripheral surface, in particular an outer peripheral surface of the ball piece, which is left in its raw state. In particular, the sealing volumes are positively and / or non-positively and / or materially connected to the unprocessed outer peripheral surface of the ball piece. In particular, the sealing volumes are molded onto the unprocessed outer peripheral surface of the ball piece, in particular molded onto it in a sealing manner. In particular, the sealing volumes are molded onto the unprocessed outer circumferential surface of the ball piece by means of a master molding process. This has the particular advantage that shape deviations and / or surface impairments of the ball piece in the area of the sealing surfaces can be compensated for. Such deviations in shape can, for example, be due to a forged ball piece in a forged ridge.

At least one sealing volume is preferably formed from a softer material than the material of the ball piece. In this way, the sealing volume can be easily molded onto the unprocessed outer peripheral surface of the ball piece.

According to an advantageous embodiment of the invention, at least one sealing volume is formed from a metallic material. For example, the sealing volume can be formed from magnesium or aluminum or an alloy of these two metals.

According to an alternative embodiment of the invention, at least one sealing volume is formed from a non-metallic material, in particular a plastic. In particular, the plastic is a thermoplastic, which can be provided with reinforcing fibers. In particular, the plastic is an injection-moldable plastic. Thermoplastic plastic, which is applied to the unprocessed outer circumferential surface of the ball piece by injection molding, has a higher viscosity in the processing state than injection-moldable elastomer material. It is therefore possible to seal contact surfaces of a plastic injection mold against the unprocessed outer peripheral surface of the ball piece at least to such an extent that no thermoplastic injection molding compound emerges during the injection molding process.

The two sealing surfaces expediently have a smoother surface than the unprocessed outer peripheral surfaces of the ball piece, which are arranged in the region of the two sealing surfaces. In this context, a smoother surface is to be understood as a surface that has a lower roughness depth than the aforementioned unprocessed outer peripheral surfaces of the ball piece. In particular, in addition to a smoother surface, the two sealing surfaces also have a higher dimensional accuracy, in particular with respect to a cylindrical jacket shape, than unprocessed outer peripheral surfaces of the ball piece, which are arranged in the region of the two sealing surfaces. Due to the smoother surface, in particular also due to the higher dimensional accuracy, it is possible to seal contact surfaces of an elastomer injection molding tool directly against the sealing surfaces in such a way that no liquid elastomer compound emerges when the elastomer body is injection molded.

At least one sealing volume, which surrounds the ball piece in an annular manner, is advantageously bordered in the axial direction by the ball piece. In particular, the at least one sealing volume, which surrounds the ball piece in a ring, is bordered on both sides in the axial direction by the ball piece. The axial volume gives the sealing volume a relatively high level of dimensional stability. This is particularly advantageous if the sealing volume is formed from a softer material than the material of the ball piece. In particular, the ball piece, when viewed in the axial direction, points to the side facing away from the spherical bearing area On each side of the sealing volume, there is a circumferential collar, which acts as a kind of formwork when the sealing volume is produced in a master molding process. In particular, the ball piece has two annular grooves spaced apart from one another in the axial direction, each arranged next to the spherical bearing area and at the same time unprocessed in their surface, for receiving the sealing volumes. In connection with the present invention, the axial direction of the inner part is identical to the axial direction of the ball piece, which is why sometimes only the term “axial direction” is used without further explanation.

The inner part preferably has a sealing volume on each side of the spherical bearing area, the two sealing volumes each enclosing the ball piece in a ring shape and being materially connected to one another. As a result, the two sealing volumes are formed together in one piece.

The two sealing volumes are expediently formed in one piece with the spherical bearing area. In particular, if the sealing volumes and the spherical bearing area are made of plastic and the ball piece is made of a steel material, such a configuration brings weight advantages.

The sealing surfaces preferably adjoin the elastomer body in the axial direction of the ball piece and, at the same time, away from the spherical bearing area directly and without interruption. In this way, a secure seal is given during an injection molding of the elastomer body.

Preferably, the sealing surfaces extend in the axial direction of the ball piece and at the same time away from the spherical bearing area in each case beyond support rings which partially axially surround the elastomer body. With such a configuration, the sealing surfaces have a relatively large axial length, which means that when the elastomer body is injection molded, a good seal is provided between an elastomer injection molding tool and the sealing surfaces.

The sealing surfaces advantageously extend in the axial direction of the ball piece to below the elastomer body. In this way, a reliable seal is ensured even in the event of tolerance-related geometric fluctuations in the elastomer body and / or the ball piece.

The invention further relates to a suspension arm with a molecular joint, the molecular joint having a housing. At the same time, an inner part is inserted into the housing as described above. In particular, an elastomer body of the inner part is inserted into the housing under axial prestress. In particular, the housing has a cylindrical circumferential inner circumferential surface which extends continuously in the axial direction of the inner part in the region of the elastomer body without interruption. In particular, the molecular joint is designed as a so-called dry joint, that is, as a joint without damping fluid. The permissible pivoting of a ball piece of the inner part with respect to the receiving housing is limited, for example to +/- 15 degrees in the case of torsional stress, in order to avoid damage to the elastomer body. In this way and due to the material-related restoring properties of the elastomer body, the molecular joint differs fundamentally from a ball joint, the joint ball of which is slidably mounted in a ball joint housing and can be rotated without restriction. On the end faces of the elastomer body facing away from the spherical bearing area in the axial direction of the inner part, the elastomer body in each case has a vulcanized support ring. The vulcanized support rings allow the elastomer body to be pre-tensioned in the axial direction of the inner part in the housing, which is provided for receiving the inner part. Such an axially prestressed fixing of the elastomer body is not possible without the support rings.

The suspension arm is preferably designed as a multi-point link, in particular a two-point link or a three-point link or a four-point link. The multi-point link can be designed, for example, as a two-point link in the form of a Panhard rod, a stabilizer link or an axle strut. Alternatively, the multi-point link can be designed as a three-point link in the form of a wishbone for an independent wheel suspension. The three-point link can also be designed as an axle guide link for guiding a rigid axle. Such a three-point link can each have a molecular joint, as described above, at two ends on the frame side, based on the installed state. Alternatively or additionally, the three-point link can have a molecular joint, as described above, at a third end, via which it can be connected to a central joint of a rigid axle. Analogously, two frame-side and / or two axle-side ends of a four-point link can also have molecular joints, as described above. The multi-point link is in particular a component of the chassis of a commercial vehicle for the transportation of people and / or goods.

In addition, the invention relates to a method for producing an inner part for a molecular joint, as described above, wherein the elastomer body is produced in an elastomer injection molding process. During the injection molding process, an elastomer Injection molding tool with respect to the inner part via unprocessed sealing surfaces, which, when viewed in the axial direction of the ball piece, are arranged on both sides of the spherical bearing area, the ball piece circumferentially in the form of a cylinder jacket.

• 1 in einer perspektivischen Darstellung einen Teil eines Fahrwerks gemäß dem Stand der Technik;
• 2 in einem Viertelschnitt mit einer Detaillierung, ein Innenteil für ein Molekulargelenk gemäß dem Stand der Technik;
• 3 in einem Viertelschnitt mit einer Detaillierung, ein Innenteil für ein Molekulargelenk gemäß einer ersten Ausführungsform der Erfindung;
• 4 in einem Viertelschnitt ein Innenteil für ein Molekulargelenk gemäß einer zweiten Ausführungsform der Erfindung;
• 5 in einer perspektivischen, teilweise geschnittenen Darstellung das Innenteil für ein Molekulargelenk gemäß 4;
• 6 in einer perspektivischen Darstellung einen als Zweipunktlenker ausgebildeten Fahrwerklenker gemäß der Erfindung;
• 7 in einer perspektivischen, teilweise geschnittenen Darstellung einen Teil des Zweipunktlenkers gemäß 6;
• 8 in einer perspektivischen Darstellung einen als Dreipunktlenker ausgebildeten Fahrwerklenker gemäß der Erfindung und
• 9 in einer perspektivischen Darstellung einen als Vierpunktlenker ausgebildeten Fahrwerklenker gemäß der Erfindung.

In the following, the invention will be explained in more detail with reference to drawings which merely show exemplary embodiments, the same reference numerals referring to the same, similar or functionally identical components or elements. It shows:

• 1 a perspective view of part of a chassis according to the prior art;
• 2nd in a quarter section with a detail, an inner part for a molecular joint according to the prior art;
• 3rd in a quarter section with a detail, an inner part for a molecular joint according to a first embodiment of the invention;
• 4th in a quarter section an inner part for a molecular joint according to a second embodiment of the invention;
• 5 in a perspective, partially sectioned representation of the inner part for a molecular joint 4th ;
• 6 a perspective view of a two-point control arm designed according to the invention;
• 7 in a perspective, partially sectioned representation of part of the two-point link according to 6 ;
• 8th in a perspective view a trained as a three-point control arm according to the invention and
• 9 in a perspective view a trained as a four-point control arm according to the invention.

1 shows part of a chassis 1 , the component of a commercial vehicle 2nd is. The chassis 1 has two two-point links designed as axle struts 12th on, which are arranged in a lower handlebar level and which are at the same time in a vehicle longitudinal direction x extend. The axis struts 12th are each with one end over a molecular joint 11 to a rigid axle 5 tied up. At the other end are the axle struts 12th indirectly to a vehicle frame 6 tied up; also about molecular joints 11 . The rigid axle 5 is next to the axle struts 12th additionally via a four-point link 12th guided. The four-point link arranged in an upper handlebar level 12th is both on the axis side and on the frame side via two molecular joints 11 tethered, two of these molecular joints 11 through a side member of the vehicle frame 6 are covered.

2nd shows an inner part 10th for a molecular joint 11 a suspension handlebar 12th , the inner part 10th one in its axial direction a extending ball piece 13 with a substantially spherical bearing area 14 having. The spherical storage area 14 is of a one-piece elastomer body 15 encircled in a ring. Here is the elastomer body 15 to the spherical storage area 14 of the ball piece 13 vulcanized, in particular when the inner part is subjected to torsional stress 10th a slipping of the ball piece 13 compared to the elastomer body 15 to prevent. The elastomer body 15 is in an assembled state axially between two sheet metal rings 16 clamped, which are also called support rings. The ball piece 13 has an unprocessed raw part surface 17th on, which is indicated by dash-dotted lines. Furthermore, the ball piece 13 , when viewed in its axial direction a , on both sides of the spherical storage area 14 in each case an annular circumferential, cylindrical jacket-shaped sealing surface which is also machined by turning 18th on. The two sealing surfaces 18th are suitable for the manufacture of the elastomer body 15 in an elastomer injection molding process to prevent unwanted leakage of an initially thin elastomer compound. The parallel distance between the blank surface 17th and the sealing surface 18th represents a machining allowance that is removed during machining.

An in 3rd shown inner part 10th for a molecular joint 11 a suspension handlebar 12th points in the axial direction a of the inner part 10th extending ball piece 13 with a substantially spherical bearing area 14 on that of a one-piece elastomer body 15 is encircled in a ring. When viewed in the axial direction a of the ball piece 13 , is on both sides of the spherical storage area 14 one each, the ball piece 13 cylindrical, circumferential and at the same time unprocessed, sealing surface 18th arranged. The two sealing surfaces 18th are suitable for the manufacture of the elastomer body 15 in an elastomer injection molding process to prevent unwanted leakage of an initially thin elastomer compound. The axial direction a of the inner part 10th is identical to the axial direction a of the ball piece 13 . The spherical storage area 14 has one in the axial direction a of the ball piece 13 extending axis of rotation. In any, perpendicular to the axial direction a of the inner part 10th extending planes is the spherical storage area 14 each have an uninterrupted circular design. The ball piece 13 has two attachment areas 19th which are partly machined and which is in the axial direction a of the inner part outside the elastomer body 15 and outside the sealing surfaces 18th extend and at the same time axial end sections of the ball piece 13 form. An outer peripheral surface 23 the ball piece remains both in the area of the spherical bearing area 14 as well as in the area of the two sealing surfaces 18th in an unprocessed raw state. The elastomer body 15 points at its two, in the axial direction a end faces facing away from each other each have a circumferential support ring 16 on that to the respectively assigned end face of the elastomer body 15 is vulcanized. The support rings 16 have an angular profile in cross section with an outer diameter that that of the elastomer body 15 corresponds.

The sealing surfaces 18th represent outer peripheral surfaces of sealing volumes 20th represents the ball piece 13 enclose each ring and which are made of a softer material, namely plastic, than the ball piece made of forged steel 13 . The two sealing surfaces 18th have a smoother surface than raw outer peripheral surfaces 23 of the ball piece 13 that in the area of the two sealing surfaces 18th are arranged. The ball piece 13 points two in the axial direction a spaced apart, each next to the spherical bearing area 14 arranged and untreated in their surface, ring grooves 21 to accommodate the sealing volumes 20th on. In this way, the two sealing volumes 20th in the axial direction a through the ball piece 13 edged. Because the ball piece 13 is made by drop forging, it has a circumferential forging ridge 22 on the the ball piece 13 revolves in a plane that is the axis of rotation of the spherical bearing area 14 includes. The forge ridge 22 is in the area of the two sealing volumes 20th completely covered by this. The sealing surfaces 18th close in the axial direction a of the ball piece 13 and at the same time from the spherical storage area 14 away directly and without interruption to the elastomer body 15 at. At the same time, the sealing surfaces extend 18th in the axial direction a of the ball piece 13 and at the same time from the spherical storage area 14 away each over the support rings 16 that the elastomer body 15 partially border axially, out. In the axial direction a of the ball piece 13 extend the sealing surfaces 18th at the same time under the elastomer body 15 .

4th shows an inner part 10th for a molecular joint 11 , the inner part 10th on both sides of a spherical storage area 14 one sealing volume each 20th having. Both sealing volumes 20th enclose a piece of ball 13 each ring-shaped and are materially interconnected. The material connection is so pronounced that the two sealing volumes 20th in one piece with the spherical bearing area 14 are formed and thus also the spherical bearing area 14 form whatever in 5 is easy to see. This leads to a weight advantage because of the two sealing volumes 20th and the spherical storage area 14 are made of plastic. In 4th is still an elastomer injection mold 24th for the production of an elastomer body 15 of the inner part 10th dash-dotted and shown schematically. With the elastomer injection mold 24th becomes the elastomer body 15 Made in an elastomer injection molding process, with a seal of the elastomer injection molding tool during the injection molding process 24th opposite the ball piece 13 over unprocessed sealing surfaces 18th he follows. The sealing surfaces 18th when viewed in the axial direction a of the ball piece 13 , on both sides of the spherical storage area 14 each, the ball piece 13 circumferential, arranged in a cylinder jacket. Here are the sealing surfaces 18th , when viewed in the axial direction a of the ball piece 10th , on both sides of the spherical bearing area 14 and the ball piece in each case 13 arranged in a ring all around. The ball piece 13 points to the spherical bearing area 14 in the axial direction a opposite sides of the sealing volumes 20th one all-round waistband 25th on that in the manufacture of the sealing volumes 20th in a thermoplastic injection molding process acts as a kind of formwork. For the tool elements, which are on both sides of the elastomer body 15 and at the same time between support rings 16 and the sealing surfaces 18th are arranged, they are tool slides in the axial direction a are movable.

An in 6 shown suspension handlebar 12th is designed as a two-point link in the form of an axle strut. The axis strut 12th has two identically constructed molecular joints arranged at each end 11 on. As in 7 recognize the molecular joints 11 one inner part each 10th with a ball piece 13 on. In addition, the molecular joints point 11 one housing each 26 in one of the two inner parts 10th is inserted. The two molecular joints 11 are each out of the housing 26 the inner part used in it 10th educated. Every molecular joint 11 has a shaft part 27 on, each in one piece with the housing 26 is trained. The two shaft parts 27 are through a pipe section 28 the axle strut 12th rigidly connected. An elastomer body 15 of the inner part 10th is always under axial preload in the housing 26 used. The housing 26 each has a cylindrical outer circumferential surface that extends in the axial direction a of the inner part 10th in the area of the elastomer body 15 extends continuously without interruption. At the front ends of the elastomer body 15 which, when viewed in the axial direction a of the inner part 10th , on opposite sides of a spherical storage area 14 are arranged, the elastomer body 15 one vulcanized support ring each 16 on. Through the vulcanized support rings 16 is one in the axial direction a of the inner part 10th prestressed fixing of the elastomer body 15 in the assigned housing 26 possible. The support rings 16 each rest on one end of the housing 26 against an inwardly facing, circumferential collar of the housing 26 and on the in the axial direction a opposite end of the housing 26 against a circlip. When viewed in the axial direction a of the inner part 10th , which is identical to the axial direction a of the ball piece 13 , is on both sides of the spherical storage area 14 one each, the ball piece 13 cylindrical, circumferential and at the same time unprocessed, sealing surface 18th arranged.

8th shows a suspension handlebar 12th , which acts as a three-point link in the form of an axle guide link for guiding a rigid axle 5 is formed, and has two link arms which form an angle with each other. At the free ends of these two handlebar arms is a housing 26 to hold an inner part 10th how related to 7 described, arranged. The other ends of the two link arms run in a central joint for connecting the three-point link 12th to the rigid axle 5 together. The one in the two cases 26 recorded internal parts 10th together with these each form a molecular joint 11 .

9 shows a suspension handlebar 12th , which is designed as a four-point link and has four link arms that extend from a center of the four-point link 12th extend away in a star shape. There is a housing at each end of the four handlebar arms 26 to hold an inner part 10th , as already related to 7 described, arranged. The housing 26 with the inner parts pressed into it 10th each form a molecular joint 11 .

Reference list

1

landing gear

2nd

Commercial vehicle

5

Rigid axle

6

Vehicle frame

10th

inner part

11

Molecular joint

12th

Chassis handlebars, multi-point links, two-point links, axle struts, three-point links, four-point links

13

Ball piece

14

spherical storage area

15

Elastomer body

16

Sheet metal ring, support ring

17th

Blank surface

18th

Sealing surface

19th

Fastening area

20th

Sealing volume

21

Ring groove

22

Forge ridge

23

Outer peripheral surface of the ball piece

24th

Elastomer injection mold

25th

Federation

26

casing

27

Shaft part

28

Pipe section

x

Vehicle longitudinal direction

a

Axial direction of the inner part, axial direction of the ball piece

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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

• DE 4138582 C1 [0003]

Claims (15)

Inner part (10) for a molecular joint (11) of a chassis control arm (12), the inner part (10) having a spherical piece (13) extending in its axial direction (a) with an, at least substantially, spherical bearing area (14) that extends from a one-piece elastomer body (15) is encircled in a ring, characterized in that, when viewed in the axial direction (a) of the ball piece (13), on both sides of the spherical bearing area (14) there is in each case one, the ball piece (13) circumferential and at the same time unprocessed, Sealing surface (18) is arranged, wherein the two sealing surfaces (18) are suitable for preventing an undesired leakage of an initially low-viscosity elastomer compound when the elastomer body (15) is produced in an elastomer injection molding process. Inner part (10) after Claim 1 , characterized in that the sealing surfaces (18) also represent outer peripheral surfaces of sealing volumes (20), each of which surrounds the ball piece (13) in a ring. Inner part (10) after Claim 2 , characterized in that at least one sealing volume (20) is formed from a softer material than the material of the ball piece (13). Inner part (10) after Claim 2 or 3rd , characterized in that at least one sealing volume (20) is formed from a metallic material. Inner part (10) after Claim 2 or 3rd , characterized in that at least one sealing volume (20) is formed from a non-metallic material, in particular a plastic. Inner part (10) according to one of the preceding claims, characterized in that the two sealing surfaces (18) have a smoother surface than the unprocessed outer peripheral surfaces of the ball piece (13), which are arranged in the region of the two sealing surfaces (18). Inner part (10) according to one of the preceding claims, characterized in that at least one sealing volume (20) which surrounds the ball piece (13) in an annular manner is bordered in the axial direction (a) by the ball piece (13). Inner part (10) according to one of the preceding claims, characterized in that the inner part (10) has a sealing volume (20) on both sides of the spherical bearing area (14), both sealing volumes (20) each enclosing the ball piece (13) in a ring and materially are interconnected. Inner part (10) after Claim 8 , characterized in that the two sealing volumes (20) are formed in one piece with the spherical bearing area (14). Inner part (10) according to one of the preceding claims, characterized in that the sealing surfaces (18) in the axial direction (a) of the ball piece (13) and at the same time away from the spherical bearing area (14) connect directly to the elastomer body (15) . Inner part (10) according to any one of the preceding claims, characterized in that the sealing surfaces (18) in the axial direction (a) of the ball piece (13) and at the same time away from the spherical bearing area (14) via support rings (16), which form the elastomer body (15) partially surround axially, extend out. Inner part (10) according to one of the preceding claims, characterized in that the sealing surfaces (18) in the axial direction (a) of the ball piece (13) extend below the elastomer body (15). Chassis link (12) with a molecular joint (11), characterized in that the molecular joint (11) has a housing (26) and that in the housing (26) at the same time an inner part (10) according to one of the Claims 1 to 12th is inserted. Suspension arm (12) after Claim 13 , characterized in that the chassis link (12) is designed as a multi-point link, in particular a two-point link or a three-point link or a four-point link. Method for producing an inner part (10) for a molecular joint (11) according to one of the Claims 1 to 12th , characterized in that the elastomer body (15) is produced in an elastomer injection molding process, wherein during the injection molding process an elastomer injection molding tool is sealed against the ball piece (13) by means of unprocessed sealing surfaces (18) which, when viewed in the axial direction (a ) of the ball piece (13), on both sides of the spherical bearing area (14), the ball piece (13) is arranged circumferentially in the shape of a cylinder jacket.

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