WO2011110248A1

WO2011110248A1 - Mount for a motor vehicle

Info

Publication number: WO2011110248A1
Application number: PCT/EP2010/066103
Authority: WO
Inventors: Hans-Jürgen KARKOSCH; Stefan Klose; Diethard Schneider
Original assignee: Contitech Vibration Control Gmbh
Priority date: 2010-03-09
Filing date: 2010-10-26
Publication date: 2011-09-15
Also published as: DE102010015882A1

Abstract

The invention relates to a mount (2) for a motor vehicle for mounting a load, having a housing (4), having an inner part (6) and having at least one elastic supporting spring (8) which supports the inner part (6) against the housing (4), wherein the housing (4) is an injection-moulded part composed of plastic and, in regions, has at least one stiffening element (16) which, at least in regions, is encapsulated in the plastic material by injection moulding and is connected in a positively locking or cohesive fashion to the plastic material.

Description

description

Warehouse for a motor vehicle

The invention relates to a bearing for a motor vehicle for supporting a load with a housing, an inner part and at least one elastic suspension spring, which supports the inner part against the housing. The invention further relates to a method for producing a bearing for a motor vehicle.

Bearings of the type mentioned above have long been known from the prior art and are used in a motor vehicle, e.g. used to the engine, the transmission or the drive shaft of the motor vehicle resiliently with respect to the body of the

Motor vehicle store. It is known from the prior art to manufacture the bearing housing made of steel or aluminum. This has the advantage that the bearing can be exposed to high mechanical loads due to the stability of the materials mentioned. However, it should be noted that a bearing with a housing made of these materials is relatively heavy. It has therefore also been proposed to manufacture parts of the housing made of plastic. For example, from DE 10 2007 032 957 AI a bearing of the aforementioned type is known in which a part of the housing

Plastic is made. Here, the plastic part to save weight on a cavity which is stabilized by reinforcing ribs. The plastic part is connected to complete the bearing housing with a mounting bracket, which consists of a flow-resistant material, such as aluminum. By using such a mounting bracket flow and settling of the plastic can be avoided. Another advantage of using such a mounting bracket is the fact that the bearing can be subjected to high mechanical loads. However, it should be noted that the known from the cited document a camp has relatively high weight, since the mounting bracket made of aluminum occupies a substantial part of the bearing housing.

The invention has for its object to provide a bearing for a motor vehicle, which has a low weight and at the same time is mechanically highly resilient. The invention is further based on the object to provide a method for producing such a bearing for a motor vehicle.

The object is achieved according to the characterizing features of claim 1, characterized in that the housing is an injection molded part made of plastic and partially has at least one stiffening element, which is at least partially encapsulated by the plastic material and positively and / or cohesively with the

Plastic material is connected. The object is also achieved by the independent claim 8.

Under the formulation that the stiffening element is at least partially encapsulated by the plastic material, it is understood here and below that at least one surface of the stiffening element is completely or partially covered by the plastic material during the injection process in which the housing is produced. Here, the stiffening element connects positively and / or cohesively with the plastic material. Preferably, the stiffening element is layered, i. the thickness of the stiffening element is substantially smaller than the length and the width of the stiffening element. Furthermore, the thickness of the stiffening element is substantially smaller than the thickness of the region of the housing in which the

Stiffening element is embedded (preferably, the stiffening element has a thickness which corresponds to about 2% to 50% of the thickness of the housing in the area in which the stiffening element is embedded). As material for the stiffening element, all materials are suitable which have a higher modulus of elasticity than the plastic material of the housing. An advantage of the invention lies in the fact that the bearing housing and thus the entire bearing have a low weight, since the housing except the

Stiffening element is made entirely of plastic. Another advantage of the invention is the fact that the bearing is mechanically highly resilient, since the

Housing is stabilized by the stiffening element. Another advantage of

Invention can be seen in the fact that the bearing requires little space. This is due to the fact that due to the use of the stiffening element on

Reinforcing ribs can dispense in the housing made of plastic or can form these reinforcing ribs at least smaller and thus space-saving. Another advantage of the invention is finally to be seen in the fact that the housing and thus the bearing is easy to manufacture, since the bearing is completely manufactured by injection molding.

According to one embodiment of the invention according to claim 2, the

Stiffening element made of metal, in particular aluminum or steel, and is

positively connected to the plastic. The advantage of this development is the fact that aluminum and steel have a particularly high modulus of elasticity, so that they are particularly suitable for stabilizing the housing made of plastic. Another advantage of this development is the fact that a stiffening element made of metal is inexpensive to manufacture.

According to one embodiment of the invention according to claim 3, the

Stiffening element made of a fiber-reinforced plastic and is firmly bonded to the plastic. An advantage of this development is to be seen in a special shape of the stiffening element, which allows a positive connection between the stiffening element and the plastic material of the bearing, is not necessary. Another advantage of this development is the fact that a

Reinforcing element of a fiber-reinforced plastic has a low weight, so that the weight of the bearing housing with respect to a bearing housing with a

Reinforcement element made of metal can be further reduced. Another advantage of

Further development is the fact that a stiffening element of a fiber-reinforced Plastic has a similar coefficient of thermal expansion, as the plastic, from which the housing exists otherwise. This brings advantages in the

Production of the bearing housing and later use of the bearing housing, especially in an environment with strong temperature fluctuations, with it. Another advantage of this development is finally to be seen in that certain directions in the. By appropriate alignment of the fibers in the fiber reinforced plastic

Reinforcing element and thus can be particularly reinforced in the bearing housing. The stiffening of the bearing housing can thus be anisotropically aligned by means of a stiffening element made of a fiber-reinforced plastic. Thus, it is possible, for example, to align the stiffening element in the bearing housing so that the fibers in the fiber-reinforced plastic extend in a direction in which the bearing housing is subjected to tension. The fibers in the stiffening element can then absorb the tensile forces. According to one embodiment of the invention according to claim 4, the

Stiffening element of a glass fiber fabric, which is embedded in a polyamide. The advantage of this development is the fact that a glass fiber fabric can absorb tensile forces in two directions, namely in the warp and weft directions of the individual fabric fibers. In this case, it is possible to reinforce one of the two directions by making the glass fibers more dense in this direction than in the other direction.

According to one embodiment of the invention according to claim 5, the at least one stiffening element is arranged in a region of the housing, which is exposed to particularly high loads. The areas of the housing, which are exposed in later use of the bearing particularly high loads, already in the construction of the

Warehousing in a conventional manner, for example by FEM calculations or on a test bench to be determined. The advantage of this development is the fact that the stiffening element is used only in particularly heavily loaded areas of the bearing housing and thus can be optimized in size. This leads to a further optimization of the weight of the bearing housing. According to one embodiment of the invention according to claim 6, the at least one stiffening element extends over an entire load path of the housing. A load path in the housing is characterized by the fact that it must absorb particularly high mechanical loads during use of the bearing. A load path thus runs, for example, through a web which connects two suspension points of the bearing. The advantage of this development is the fact that the load path of the housing is reinforced overall by a stiffening element and thus can be exposed to particularly high mechanical loads. According to one embodiment of the invention according to claim 7, the stiffening element is formed as Endlosteil. The advantage of this development is the fact that a stiffening element in the form of an endless part can absorb particularly high tensile forces. This is particularly the case when the stiffening element of a

fiber reinforced plastic, in which the individual fibers of the

Stiffening element are aligned in the circumferential direction of the endless part.

An embodiment and further advantages of the invention will be explained in connection with the following figures, in which:

1 shows a bearing for a motor vehicle,

2 shows a bearing for a motor vehicle,

Fig. 3 shows a bearing for a motor vehicle.

Fig. La shows a bearing 2 for a motor vehicle for supporting a load in

Motor vehicle. Such bearings are known from the prior art for a long time, so that the basic structure of the bearing 2 is to be explained only briefly. The bearing includes a housing 4, which comprises an inner part 6. Furthermore, the bearing 2 shown contains two elastic suspension springs 8a, 8b, with which that inner part 6 or 10 is supported against the housing 4 (there are also known bearings which have only a single suspension spring). In addition, the bearing 2 includes a through hole 10 which is used for fastening the bearing 2 on the body of the motor vehicle, not shown, and a Through hole 12 which is used to attach the load to be stored by means of the bearing 2 resiliently relative to the body of the motor vehicle.

Fig. Lb shows the top view of the outer wall 14 of the bearing 2 (see also Fig. La). FIG. 1c shows a cross section along the line AZA shown in FIG. 1b. The housing 4 of the bearing 2 is a plastic injection molded part. The housing 4 has a stiffening element 16 that is completely encapsulated in the embodiment shown by the plastic material and positively with the

Plastic material of the housing 4 is connected. The stiffening element 16 is made of metal, in particular of aluminum or steel and is designed as a continuous part, which runs parallel to the side wall 14 of the bearing 2. This includes the

Stiffening element 16, the inner part 6 with the passage opening 12 and the

Through hole 10. Fig. Ld shows the stiffening element 16 in a perspective view. The

Stiffening element 16 includes a plurality of windows 18, which are flowed through in the production of the housing 4 (see Fig. Lc) by injection molding of the injected plastic material, so that the stiffening element 16 positively connects with the plastic material of the housing 4. In that shown in FIG. 1

Embodiment, the stiffening element 16 is completely on all sides of the

Plastic material of the housing 4 surrounded. However, it is also possible, the bearing 2 in such a way that only the radially inwardly directed surface 20 of the

Stiffening element 16 (see Fig. Ld) is completely covered by the plastic material and the outwardly facing surface 22 of the stiffening element ld is covered only in the region of the windows 18 of the plastic material. Also in this case, the stiffening element 16 is positively connected to the plastic material of the housing 4 via the window 18, through which the plastic material penetrates during the injection molding process. Fig. 2a shows a bearing 2 for a motor vehicle in a perspective view. The basic structure of the bearing 2 according to FIG. 2a agrees with the structure of the bearing 2 of Fig. La match, so that reference is made in this regard to the description of the figures to the Fig. La. The housing 4 of the bearing 2 contains stiffening elements 16a and 16b, which are arranged in areas of the housing 4, which are exposed to particularly high mechanical loads. In this case, the stiffening element 16a is arranged in the region of the housing 4 which is arranged furthest away from the passage opening 10. On the other hand, the stiffener 16b is disposed in the land and the housing 4 connecting the through hole 10 to the through hole 12 (the stiffener 16b is thus disposed in a load path of the housing). Also, this web of the housing 4 is particularly high when using the bearing 2

Exposed to stress. An additional stiffening element can be arranged in the second web, which connects the through-opening 10 with the through-opening 12, and which lies opposite the first web in which the stiffening element 16b is arranged. The stiffening elements 16a, 16b are located in the side wall 14 of the housing 4 and parallel to this. The outwardly directed surfaces of the stiffening elements 16a, 16b are largely free of the plastic material of the housing 4th

Fig. 2b shows the stiffening element 16a in an enlarged view. The

Stiffening element 16a is, like the stiffening element 16b, made of a fiber-reinforced plastic and is materially connected to the plastic of the housing 4 (see Fig. 2a). The fiber-reinforced plastic consists of a

Fiberglass fabric 24, which is shown schematically in the broken part of the

Stiffening element 16a is indicated. In the glass fiber fabric 24, the threads 26, which are loaded in the built-in stiffening element 16a train, much closer together than the threads perpendicular thereto extending 28. Thus, it is possible that the stiffening element 16a can on the one hand high mechanical loads in the pulling direction and On the other hand, it can simply be curved as shown in FIG. 2b. The contour of the stiffening element 16a can thus be adapted particularly well to the outer contour of the housing 4 of the bearing 2. The glass fiber fabric 24 is embedded to complete the stiffening element 16b in a polyamide, the a cohesive connection of the stiffening element 16a with the plastic material 4 of the bearing 2 allows.

Fig. 3 shows a bearing 2 with a housing 4 and a stiffening element 16, which largely corresponds to the bearing shown in FIG. The only difference can be seen in that the stiffening element 16 is formed as Endlosteil. Also, the stiffening element 16 shown in FIGS. 3a and 3b consists of a fiber-reinforced plastic and is materially connected to the plastic of the housing 4.

In particular, the stiffening element 16 consists of a glass fiber fabric which is embedded in a polyamide. The threads may be oriented within the glass fiber fabric as already explained in connection with FIG. 2b, wherein the threads in the glass fiber fabric, which are in the circumferential direction of the

Stiffening element run, are endless. The stiffening element 16 is integrally connected via the radially inwardly directed surface 20 with the outer wall of the housing 4 of the bearing 2. The radially outwardly directed surface 22 of the stiffening element 16 remains largely free of the plastic material from which the housing 4 of the bearing 2 is injected.

The bearings shown in FIGS. 1 to 3 are produced as follows: In a first step, the housing 4 is produced by injection molding. For this purpose, the stiffening element 16 is inserted into an injection mold, which corresponds to the shape of the housing 4, and fixed in its position. If the housing 4 is to have a plurality of stiffening elements, all stiffening elements are inserted into the injection mold and fixed there in the intended position, which they are later to occupy in the housing 4. Thereafter, in the injection mold for producing the housing 4, a plastic material is injected, wherein the stiffening element at least partially of the

Plastic material is encapsulated and positively (see Fig. 1) or cohesively (see Figures 2 and 3) is connected to the plastic material. After this

Injection process, the housing 4 is removed from the injection mold. The remaining components of the bearing are connected in a conventional manner with the housing 4 of the bearing 2. LIST OF REFERENCE NUMBERS

(Part of the description)

2 bearings

4 housing

6 inner part

8 suspension spring

10 passage opening

12 passage opening 14 outer wall

16 stiffening element

18 windows

20 surface

22 surface

24 glass fiber fabric

26 threads

28 threads

Claims

claims

1. bearing (2) for a motor vehicle for supporting a load, with a housing (4), an inner part (6) and at least one elastic suspension spring (8), which supports the inner part (6) against the housing (4),

characterized,

the housing (4) is an injection-molded part made of plastic and has, in regions, at least one stiffening element (16) which is encapsulated at least in regions by the plastic material and is positively and / or firmly bonded to the plastic material.

2. bearing (2) for a motor vehicle according to claim 1, characterized in that the stiffening element (16) made of metal, in particular made of aluminum or steel and is positively connected to the plastic.

3. bearing (2) for a motor vehicle according to claim 1, characterized in that the stiffening element (16) consists of a fiber-reinforced plastic and is materially connected to the plastic.

4. bearing (2) for a motor vehicle according to claim 3, characterized in that the stiffening element (16) consists of a glass fiber fabric (24) which is embedded in a polyamide.

5. bearing (2) for a motor vehicle according to one of claims 1 to 4, characterized

in that the at least one stiffening element (16) is arranged in a region of the housing (4) which is subjected to particularly high loads.

6. bearing (2) for a motor vehicle according to one of claims 1 to 4, characterized

characterized in that the at least one stiffening element (16) extends over an entire load path of the housing (4).

7. bearing (2) for a motor vehicle according to claim 6, characterized in that the stiffening element (16) is designed as Endlosteil.

8. A method for producing a bearing (2) for a motor vehicle with a

Housing (4), an inner part (6) and at least one elastic suspension spring (8), which supports the inner part against the housing (4), characterized by the following method steps:

- In an injection mold at least one stiffening element (16) is inserted,

- In the injection mold is used to produce the housing (4)

Injected plastic material, wherein the stiffening element (16) is at least partially encapsulated by the plastic material and is positively or materially connected to the plastic material,

- The housing (4) is removed from the injection mold,

- The remaining components of the bearing (2) are connected to the housing.