CH650843A5 - Vibration damper. - Google Patents

Description

650 843

2nd

PATENT CLAIMS 13. Process for producing a vibration damper

1. Vibration damper, characterized by heel according to claim 1, characterized in that a) a first and a second part, which are arranged coaxially and in counter-A) the first and the second part at the same time at a side distance and from consist of a hard thermos or a second mold cavity by injection molding of polymeric polymer material, and 5 produces and b) a third part which is arranged between the first and the second B) the third part between the first and the second part and attached to the latter, the part being produced by injection molding, so that the thermoplastic third part is made of a thermoplastic organic elasto-organic elastomer material from which the third part is made of general material and is formed by direct connection of the, directly with the hard thermoplastic po-thermoplastic organic elastomeric material connects to the i0 lymer material from which the first and the second first and the second part is attached. Part are made.

2. Vibration damper according to claim 1, characterized- 14. The method according to claim 13, characterized in that the third part by direct fusing that the third part is formed after the hard therm- ing of the thermoplastic organic elastomeric mate - Moplastic polymeric material has solidified, but before it rials and the hard thermoplastic polymeric material 15 has reached its maximum hardness.

is connected to the first and the second part. 15. The method according to claim 13 or 14, thereby

3. Vibration damper according to claim 1 or 2, characterized in that the first and the second part made of Po-characterized in that it connects interfaces where the lystyrene produces.

third part connected to the first and the second part 16. The method according to any one of claims 13 to 15, characterized in that the depth is of the order of 2.5 x 10-5 mm 20 characterized in that the third part is made from one Co-hat. polymer of styrene and butadiene.

4. Vibration damper according to one of claims 1 to

3, characterized in that it is a through the first part

formed outer flange-shaped section and an inner sleeve-formed by the second part

mig trained section. The present invention is concerned with improvements

5. Vibration damper according to claim 4, characterized against in the technology of the vibration damper and refers to that the third part has a cross-section limited by a curved line to vibration dampers with a novel shape. like a new process for making such swine

6. Vibration damper according to claim 4, thereby ge 30 damper.

indicates that it has a central axis and that the dampers are known. A number of different types of vibration measurement of the second part parallel to the central axis are known. The invention relates primarily to the loan is greater than the corresponding dimension of the first on plate-shaped and tubular vibration damper, part. which are referred to as such because the plate-shaped

7. Vibration damper according to claim 6, characterized in that the vibration damper has a small ratio of length to that the third part has an outer section which has a diameter and is therefore relatively flat, is fastened to the first part, an inner section which is attached during the tubular vibration damper, a second part is fastened, and a transition section, in fact a large ratio of length to diameter ha, which connects the outer section and the inner section. Before the present invention, such were made, the outer section being connected to the first part, usually consisting of an inner part and a

which is surrounded by it and the inner section with a metal outer part and an elastomeric molded part,

connected to at least a part of the second part and arranged between the two metal parts and connected with them.

at least part of the second part is surrounded and connected. This well-known con-

the transition section, preferably in a pointed winter structure, allowed the production of vibration

kel extends to the central axis. 45 dampers with different sizes and for different

8. Vibration damper according to one of claims 1 to areas of stresses, but the manufacturing process

7, characterized in that the first and the second part ren comprise a number of stages which increase the price of the product made of polystyrene with a flexural modulus of more than 28,000 tes and must be carried out carefully so that kg / cm2 exist. the product is reliable. Among these levels are

9. Vibration damper according to one of claims 1 to so important cleaning the metal parts, the application

8, characterized in that the third part made of a white or the additive or adhesive material with a low modulus and a Shore hardness A material on the metal parts, so that they with the elastomer between 35 and 85, preferably one Copolymer of part are connected, and finally the insertion of styrene and butadiene. Parts into the mold to make the elastomeric part. The ss shaped product must also be heated to prevent the volcanic

10. Vibration damper according to one of claims 1 to effectation of the elastomer and to bring it to an end.

9, characterized in that the first and the second part Third is a shear strength of the connection from about 28 to tubular. 35 kg / cm2 is desirable to prevent the elasto-

11. Vibration damper according to claim 10, thereby separating the merged part from the metal parts, and thus the vibra- indicates that the first part fulfills and cuts a tubular damper which 60 surrounds the technical requirements and surrounds the third part and is connected to it can be used for a long time. This value is, as well as a flange-shaped section, which can be made in one piece with the tubular shear strength of the connection only by correct con-shaped section. structure and exact adherence to the manufacturing conditions

12. Vibration damper according to claim 10, characterized against, including correct regulation of the mold temperatures, that the second part in the direction of the mean 65 and pressures can be achieved.

axis is longer than the first part and a portion of the two- A first object of the invention is a new and fixed part extending in the direction of the central axis of the second part of the method for producing plate-shaped and extending parallel to the first part. tubular vibration and shock absorbers as well as new ones

3,650,843

and to provide improved vibration and shock absorbers largely from one or more polymers and / or gung. or one or more copolymers. In addition,

A second important object of the invention is to manufacture the material of vibration and shock absorbers of the described type used for the production of parts 2 and 4 and the material of the type used for the production of part 6 in one to enable the 5 rial to be compatible in the sense that they are able to combine difficulties and limitations of the known manufacture by melting, ie by avoiding or significantly reducing the contacting process with the materials, while at least

will. at least one of them is in a liquid state, and that in

A further object of the invention is to then cool a process for the liquid state of the material present until it has solidified in the manufacture of vibration and shock absorbers and to provide a connection with the other material which is considerably faster and cheaper. has formed. Although parts 2 and 4 can be made of different materials than those already compatible in this field, they can be used for the same purpose in the same or related processes. melt and solidify at almost the same temperature,

These objects are achieved by what might be set out in claims 1 and 13, they are preferably achieved from the stated features. The vibration damper 15 made of the same material. Preferably, parts 2 made of two different plastics are used and 4 have a flexural modulus of more than 28,000 kg / cm 2, while a process for the production of composite parts 6 are made from a soft thermoplastic elastomer injection molding by «joint injection molding» , with a low modulus and a Shore hardness A in between the elastomeric material only exists after the hard thermos 35 and 85. For example, but not necessarily plastic material is injected. This sequence 20 parts 2 and 4 made of polystyrene with one of the injections is used to achieve a correct connection bending modulus of approx. 32 700 kg / cm 2 and part 6 from a mixture of the two materials. Further Details Butadiene-styrene copolymer with a Shore A hardness of and related advantages of the invention are produced in FIG.

The following detailed description of preferred and al- The parts 2, 4 and 6 are shown in the drawing with sharply defl-alternative embodiments of the invention and the enclosed boundary surfaces, since the phase boundary drawings are described or explained in detail, areas between these parts, as are more detailed below in the drawing: explained, there is practically no mutual

Fig. 1 is a sectional view of a plate-shaped schung or diffusion of the thermoplastic materials

Vibration damper according to a preferred embodiment.

tion form of the invention; 30 In Fig. 1, the inner part 2 has an annular upper end face

2A to 2C sectional views, the various surface 8 and an annular lower end face 10, a zylin phases of the injection molding process in the manufacture of the inner surface 12, which delimits an axial bore 17,

1 illustrate the vibration damper; and an outer boundary surface, which is shown as a rotation surface similar to FIGS. 3 and 4 of two further views and has cylindrical end sections 16 and 18 as well as guide forms of the inventive vibration 35 a double-curved transition section 20, damper. The outer part 4 serves as a flange for the vibration

In Fig. 1 is a plate-shaped vibration damper and has a cylindrical outer surface 22 and one shown, which consists of an inner part 2, an outer part 4 and inner boundary surface 24, which is a cylindrical part-a middle part 6. Both the inner part and that is made, as well as mutually parallel upper and lower front outer part are made of an essentially hard thermoplastic surface 26 or 28, which is made of the material 8 to the corresponding end surfaces, while the middle part is made of egg or 10 of the inner part 2 are parallel and are made at right angles to the thermoplastic elastomer. Extend out of the axis of the inner part. The outer part also has pressure "essentially hard thermoplastic material" a plurality of mounting holes 5. The middle part 6 has one is used to designate a solid, substantially hard inner portion 30 and an outer portion 32, which are made of the material that has the property to melt 45 inner part 2 at its cylindrical end section 18 or with (ie to soften until it becomes liquid) when it is heated to a suitable outer part 4 at its inner boundary surface 24, and to harden and again are tightly bound, as well as a curved transition section and to become essentially hard when it is at room temperature 34, which is between the inner part 2 and the outer part 4, ie approx. 20 ° C, is cooled while the extension extends. The transition section 34 is connected to the inner part 2 pressure “thermoplastic elastomer” a solid material, so at its transition section 20. The meaning that has the property to melt when it acts on the transition section 34 as a spring, which heats the inner part 2 to a suitable temperature, and to harden and locate in relation to the outer part 4 in an elastic manner, to change into a solid 1, which is elastic and behaves like if the vibration damper according to FIG. 1 behaves according to the one elastomer when it is produced to the room temperature molding process described below, is cooled. These thermoplastic materials can practically neither diffuse the one material in a single thermoplastic polymer substance or the other material nor mix the one mat a mixture of such substances and oppositely occur with the other material. In addition, along with additives such as dyes, plasticizers, antioxidants, the boundary areas, there are no or only slight deformation agents, stabilizers and other effective constituents, that of one material through the other. It was contained by one or more of the physical properties of the thermal examinations of sections of vibration dampers modifying the plastic substance or the thermoplastic substance shown in FIG. 1 in a suitable manner using a raster electro-zen. microscope at 20,000 times magnification

Another feature of the invention is that it is found that the boundary surfaces between the part, parts 2, 4 and 6 have to be injection molded. from the thermoplastic elastomeric butadiene-styrene-Co-Therefore, the essentially hard thermoplastic 6S polymer and the polystyrene parts have an interface material and the thermoplastic elastomer has to be made of molding material (ie a region in which one material is produced in the other that are diffused by injection molding or that one material can mix with the other. The molding compounds are at least mixed), the thickness of which is only of the order of magnitude

650 843 4

of 2.5 x IO-5 mm. Nevertheless, the connection is between 1 and 3 seconds after the mold cavities 62

see the elastomeric part and the non-elastomeric parts and 64 have been filled, can be filled and that so firm that the vibration damper still satisfactorily a satisfactory connection between the ela

works. stomeric part and the non-elastomeric parts is achieved.

2A to 2C show how the vibration 5 After the part 6 has solidified in the mold cavity 78 into a fixed damper according to FIG. 1 according to a preferred embodiment, the molded parts 38 and 40, finally, form the invention with the help of a mold for the common as shown in Fig. 2C, separated from the molded part 36-injection molding composite injection molded parts produced on the finished vibration damper is removed from the mold, which are essentially three in relation to each other and set aside for cooling can. Then movable parts 36, 38 and 40 as well as a core 42, which is used to fasten the parts for the next injection molding cycle as-is to the part 36. As in FIG. 2A, this is brought into the position shown in FIG. 2A.

, the form part 36 has a specially shaped inner boundary surface which has four different sections 44, 46, 48 in the preferred embodiment of the invention and 50, while the form part 38 has an inner end face parts 2 and 4 of the vibration damper made of poly surface 52 and has a cylindrical contact surface 54. The 15 styrene molded, which after solidification has a flexural modulus of part 40 has a curved inner boundary surface, 32,700 kg / cm2 while part 6 of the vibration has the sections 56 and 58, and a cylindrical damper made of a butadiene-styrene copoly -Outer surface 60, which is produced in a tight sliding fit with respect to the commercial, a Shore tact surface 54 being arranged after solidification. The molded parts are arranged in such a way - hardness A between 35 and 85 (depending on that for the Schwin-net, that when the mold is closed, the section 50 and the 20 dampers desired «spring hardness»), with the butt end face 52 lying snugly against one another while the lystyrene sections preferably form the Shell DP-203 brand of Figures 44 and 58 and the core 42 preferably form a first mold cavity 62 Shell and the butadiene-styrene copolymer, and the section 48, the inner end surface 52 and the Kraton 3000 brand product (a series from thermopla-upper part of the cylindrical outer surface 60 is a second static rubber from Shell). Form the appropriate tempera mold cavity 64. The form member 40 has a central 25 doors and pressures depend on the properties of the use bore 66 in which the core 42 is tightly fitted with materials, that is, the above polystyrene. A plurality of pins 68, which are fastened in the molded part 36, the molding compound is arranged at a pressure of approximately 350 kg / cm 2 in the molded part 38 with a tight sliding fit in holes 70 in the molded part and a temperature of approximately 200 ° C. The pins 68 serve as cores for the molding cavities 62 and 64, and the protruding buta-the mounting holes 5. The molded parts 36, 38 and 40 30 diene-styrene molding compound is used at a pressure of approx. with the aid of conventional co-injections, not shown at approximately 420 kg / cm 2 and a temperature of approx. 200 ° C., but known to those skilled in the art of injection molding, into the mold cavity 78. The latter stage of injection molding) with respect to one another along the axis of the core 42 should move about 1 to 3 seconds after the end of the process, so that the molded parts 38 and 40, as described below injecting the polystyrene molding compound into the mold cavity, are separated with respect to the molded part 36 and select spaces 62 and 64 done. The injection molding compounds are movable in different positions along the axis of the core during the two stages of the injection molding process on a Tempe-42. temperature of approx. 200 ° C, but the shape is maintained during

The vibration damper shown in Fig. 1 is under the molding process at a temperature of about 40 to about using the multi-part mold, which is kept at 65 ° C in Figs. 2A to 2C. The mold is then opened and the finished one is shown, made according to the following procedure. 40 Product about 1 minute after completing the second stage of the

First, the molded parts 36, 38 and 40 are taken out in the injection molding process in FIG. 2A. The finished, fully closed position is shown (the first molded part is then set aside and left to room temperature).

Injection position), whereupon a suitable liquid is cooled before it is labeled, tested and packaged. The further

Moplastic injection molding compound which can solidify to a hard or nutty product showing a shear strength of the connection to hard solid (eg polystyrene) 45 between part 6 and parts 2 and 4 of at least through the injection openings 74 and 76 into the mold cavity - 28 to 35 kg / cm2, usually between approx. 42 and approx.

spaces 62 and 64 is injected to form parts 2 and 4 of 56 kg / cm2, while forming the typical bond strength between vibration dampers. Then the molded part 40 is retracted from the metal parts and the elastomeric part by conventional means until the outer edge of the section 56 is aligned with lying vibration dampers made of metal and elastomer approximately the inner end face 52, so that a third mold is 35 kg / cm 2.

cavity 78 is formed, as shown in Fig. 2B (It should be noted that it is decided by

second spray position). Then a suitable liquid thermoplastic meaning is that the elastomeric material is injected after the moplastic injection molding compound, which is injected into a solid material to inject the hard material. It has been found with the properties of an elastomer to solidify that no satisfactory vibration damper can be found.

(e.g., a butadiene-styrene copolymer) that can be created by one or 55 when the elastomeric material simultaneously injection several of the injection ports 80 into the mold cavity 78 with the hard material or before the hard material.

sprayed to form part 6 of the vibration damper. is injected because the elastomeric material under the pressures,

This stage of the injection molding process is carried out, after which the deforma- tion for the injection of the hard plastic material into which the mold cavities 62 and 64 which are injected into the mold cavities 62 and 64 are required.

has become so rigid or has become so viscous that «o tion cannot resist it. This is true even

the material injected through the injection port (s) 80 when the elastomeric material has been fully vulcanized.

rial is not displaced or expanded, but is still so before the non-elastomeric material is injected,

is soft that it connects to the elastomeric material only if the injection of the elastomeric material is delayed

det. Thus, the second stage of the injection molding process is emptied until the hard plastic material has solidified until

led while the material in the mold cavities 62 6S that it is still hot under the injecting of the elastomeric material and 64, but after it is not deformed to pressures to a solid, it is possible to

stares. With a suitable choice of materials it is possible to achieve a sufficiently firm connection between the elastomeric loan that the mold cavity 78 is achieved within a very short part and the non-elastomeric parts

5 650 843

achieve that the parts of the vibration damper produce exactly with 90 (Fig. 3), which match the shape of the three mold cavities from a cylindrical inner part. 2A, a cylindrical outer part 4A with an annular flange A further pronounced advantage of the invention is 92 and a cylindrical middle part 6A with a flat end face in that the “spring force” of the vibration damper is compared. The invention can also be modified, for example, by turning the composition 5 and 5 to produce a tubular vibration damper, therefore the hardness of 96 (FIG. 4) used to manufacture the middle part 6, in which the three parts 2B, 4B and 6B modified the material. For example, the Kraton - all are cylindrical and the length of the part 6B its internal molding compound available from Shell as Kraton 3226 with a ren and its outer radius significantly exceeds. This Shore A hardness of 35, as the Kraton 3202 with a Shore hardness of both alternative embodiments of vibration A of 55 and as the Kraton 3204 with a Shore A hardness of 10 dampers have other vibration-damping properties-85. Other hardnesses can be achieved by appropriately mixing two than the vibration damper of Fig. 1, even if they are made of any or all of the above three Kraton materials, from the same materials as the latter, or by using other thermoplastic materials An additional advantage of the invention is that static elastomers are added or, instead of the materials mentioned, they are used with a wide variety of thermoplastic injection molding materials. 15 sen can be executed. So could the thermoplastic

The stiffness of parts 2 and 4 can be modified, an elastomeric injection molding compound from which part 6 is produced by mixing a certain amount of the elastomeric molding compound, a mixture known to those skilled in the art, from a butadiene sty- with the polystyrene molding compound. It is important to note that parts of this composite copolymer contain or depend on this that parts 2 and 4 are not absolutely hard. In this context it must be stated; for vibration dampers for certain 20 that the term "thermoplastic elastomer" applications may suffice or be desirable, is a technical term already known to those skilled in the art, such that these parts are only stiff, i.e. are semi-rigid. from Tobolsky et al, “Polymer Science and Materials”, page

Another advantageous feature of the preceding 277, Wiley-Interscience (1971) emerges, and that a variety of

preferred embodiment of the invention consists in the number of such materials is already known, as described in A.A.

that the molding materials are coaxial (instead of biaxial, as in the 25 Walker, "Handbook of Thermoplastic Elastomers" (1979)

US Pat. No. 3,950,483 described by I. Martin Spier).

be injected. It has been found that the shaping could also make the rigid thermoplastic parts 2 and coaxial injection easier to perform and 4, for example, but not necessarily, provides a more reliable product from one. Acrylonitrile-butadiene-styrene terpolymer (ABS), polymeth-

Another advantage of the invention is that 30 yl methacrylate (plexiglass), a propylene polymer and vibration damper with various shapes, various other materials, which are obvious to the person skilled in the art and various vibration-damping properties and e.g. from U.S. Patent No. 3,941,859,3,962,154 and shadow. Thus e.g. 4,006,116 are known. The particular choice of shape and / or the size of the middle part 6 due to the mere fashion of the materials used depends on the desired identification of the different parts of the shape and the compatibility of the elastomeric and the. Furthermore, e.g. by a suitable design of the multi-non-elastomeric materials with respect to the connection with the joint shape possible, a flat vibration damper from each other.

C.

1 sheet of drawings