EP3953606A1

EP3953606A1 - Hydraulically damping bearing

Info

Publication number: EP3953606A1
Application number: EP20707646.4A
Authority: EP
Inventors: Philipp Werner; Hilrich Kardoes; Oliver Breiden
Original assignee: Vibracoustic SE
Current assignee: Vibracoustic SE
Priority date: 2019-04-08
Filing date: 2020-02-28
Publication date: 2022-02-16
Also published as: CN113906236A; CN113906236B; DE102019109212A1; WO2020207661A1

Abstract

The invention relates to a hydraulically damping bearing (10) for supporting a vehicle part on a vehicle body, comprising an inner part (12), an outer part (16) which surrounds the inner part (12), forming an intermediate space (14), and which can be calibrated by reducing its diameter, and an elastomer element (18) which is arranged in the intermediate space (14) and elastically connects the inner part (12) and the outer part (16) to one another, wherein the elastomer element (18) divides the intermediate space (14) into at least two chambers (24a, 24b) filled with a fluid, which are connected to one another via at least one channel, wherein the elastomer element (18) is reinforced with a cage (28) having at least one protruding support device (36) on an outer peripheral surface facing the outer part (16), wherein the elastomer element (18) is provided with at least one sealing device which is arranged next to the support device (36) and seals the chambers (24a, 24b), wherein the sealing device protrudes beyond the support device (36) in the non-calibrated state and wherein the support device (36) is designed in a segmented manner.

Description

Hydraulically damping bearing

The present invention relates to a hydraulically damping bearing for mounting a vehicle part on a vehicle body, comprising an inner part, an outer part surrounding the inner part with the formation of a gap, which can be calibrated by reducing its outer diameter, and an elastomer body which is arranged in the gap and which The inner part and the outer part are elastically connected to one another, the elastomer body dividing the space into at least two chambers filled with a fluid, which are connected to one another via at least one channel.

A hydraulically damping bearing of the type mentioned is used in a vehicle to store a chassis part or a vehicle assembly on a vehicle body and to dampen and / or eliminate the vibrations caused by the uneven road surface or the vibrations caused by the vehicle assembly and so the Increase driving comfort. The damping function is achieved in that the introduced vibrations lead to a movement of the inner part relative to the outer part and vice versa, whereby one of the chambers is made smaller and the other chamber is enlarged. As a result, the fluid in the reduced chamber flows through the channel into the other chamber. The flow resistance opposite to the flow direction in the channel creates a damping effect, while the fluid column, which vibrates in phase opposition to the excitation amplitude near the natural frequency, has a til ing effect on the vibrations introduced.

The chambers filled with fluid become soft to the outside through expandable

Elastomeric membranes limited. To reinforce the expandable elastic elastomer membranes, it is known to embed a so-called cage in the elastomer body. In order to prevent leakage of the fluid-filled chambers, these must be sealed off from the environment. For this purpose, the elastomer diaphragms are provided with sealing lips that sit on the cage.

DE 10 2013 204 995 A1 discloses a hydraulic axle carrier bearing which has an inner part, an outer part and an elastomer body arranged in between, which is provided with a plastic cage, the plastic cage having at least one sealing groove which are arranged on an outer side of the Kunststoffkä figs . The sealing groove lies opposite the inner wall of the outer part, the sealing groove being filled with an elastomeric material.

In addition, EP 1 291 549 A1 discloses a hydraulically damping bush bearing with an intermediate ring which is provided with circumferential projections, the elastomer body forming dome areas in the area of the circumferential projections to seal the liquid-filled chambers.

In addition, DE 10 2006 025 251 B4 reveals a hydraulically damping rubber bushing bearing which has a metallic inner part, an elastomeric bearing body surrounding the inner part, an outer part for reinforcing the bearing body and at least two inflation chambers arranged in the bearing body for receiving a fluid damping agent. To seal off the expansion chambers, the bearing body has a sealing bead.

To adjust the rigidity of a hydraulic damping bearing, the hydraulic damping bearing is calibrated by reducing the outer diameter of the outer part. This compresses the elastomer body and introduces a preload. During the calibration, the sealing lips are exposed to strong mechanical loads that can damage the sealing lips.

In order to avoid damage to the sealing lips, DE 10 2007 034 475 B4 suggests a hydraulically damping bearing made of an elastomer, egg nem metallic inner bolt, which is surrounded by a vulcanized two-part intermediate sleeve in half-shell shape so that due to the shape of the elastomer between this and the inside of the intermediate sleeve form two symmetrical, diametrically opposite chambers, which are used for receiving serve a hydraulic damping fluid, as well as an outer sleeve pulled over the intermediate sleeve. Sealing lips inserted between the outer and intermediate sleeves are vulcanized into the two chambers, which are designed in a bead-like shape and arranged in a recess in the intermediate sleeve. After the hydraulic bearing has been installed, the sealing lips are calibrated or adjusted in such a way that the inner diameter of the outer sleeve is reduced and the pressure on the sealing lips increased.

The present invention is based on the object of creating a hydraulically damping of the bearing which has an improved seal when calibration is carried out via the outer part.

To solve the problem, a hydraulically damping bearing with the Merkma len of claim 1 is proposed.

Advantageous embodiments of the hydraulically damping bearing are the subject of the dependent claims.

A hydraulically damping bearing for mounting a vehicle part on a vehicle body has an inner part, an outer part surrounding the inner part with the formation of a gap, which can be calibrated by reducing its diameter, and an elastomer body which is arranged in the gap and the inner part and the Outer part elastically connected to one another, the elastomer body dividing the space into at least two chambers filled with a fluid, which are connected to one another via at least one channel, the elastomer body being reinforced with a cage which has at least one protruding from an outer peripheral surface facing the outer part Has support device, wherein the elastomer body is provided with at least one sealing device which is arranged adjacent to the support device and seals the chambers, the sealing device protruding beyond the support device in the non-calibrated state and wherein di e support device is segmented.

The bearing according to the invention is characterized by a segmented Abstützein direction. The task of the segments is that of the sealing device during the calibration only approximately to the level of the support device, in particular the calibrated support device is compressed. The Abstützeinrich device thus prevents the sealing device from being squeezed to a critical extent and thus damaged. During the calibration, the outer diameter of the outer part and / or an outer diameter of the cage is reduced, where the elastomer arranged between the inner part and the cage is compressed or calibrated. As a result, the stiffness and the life of the elastomer body and thus the bearing are adjusted. If the outer diameter of the support device is reduced, one speaks of a calibrated support device or a calibrated cage.

In addition, the segmentation of the support device enables elastomer to flow through the depressions or spaces between the segments during production and the sealing device to be vented through the spaces during the filling process. This means that leakage errors in the seal during production and, as a result, leaks can be avoided. Such leakage errors are favored if the air pushed forward by the elastomer flow front cannot escape immediately behind the seal, as the vulcanization mold presses on a non-segmented, circumferential support device in order to keep this support device free of elastomer so that the outer sleeve during the calibration process can press directly on the outer part. Furthermore, the support device has the effect that calibration forces from the outer part are not introduced into the cage via the seal, but these forces are introduced via the support device. The support device thus creates additional installation space for the sealing device that is protected from calibration, so that it can be made higher.

In the present case, segmentation is understood to mean the subdivision of a circumferential closed structure into individual segments, the segments being separated from one another by spaces or recesses. The segmented support device is thus formed from alternating elevations and recesses or spaces. In the present case, calibration is understood to mean the application of a force, in particular a compressive force, to the outer part, as a result of which an outer diameter and / or an inner diameter of the outer part and to the same extent the

The diameter of the cage is reduced in order to induce compressive stresses in the elastomer placed inside the cage and thus to adjust its stiffness and service life. Accordingly, the condition that is not calibrated is understood to be that which corresponds to the state of manufacture of the outer part. The calibrated state is thus understood to mean that state which is present when a force has been exerted on the outer part and its outer diameter and / or inner diameter has permanently decreased.

In an advantageous embodiment, the support device is provided only with a very thin elastomer layer or a very thin rubber coating, preferably with no elastomer layer or a rubber coating at all. As a result, a high force, in particular a compressive force, can be transmitted to the cage during the calibration of the outer part, which leads to a reduction in the outer diameter of the cage and thus to a calibration of the bearing and / or the cage.

The sealing device is advantageously arranged directly adjacent to the Abstützein direction. The sealing device can be formed from the same material and in one piece from the elastomer body. In addition, the device can be a separate part. The sealing device is advantageously made of an elastomeric material.

In an advantageous embodiment, the elastomer body has Elastomermembra NEN, which are preferably designed to be flexible, and which delimit the chamber at the front. The cage serves to reinforce the elastomer body, in particular the flexible elastomer membranes, in that the cage reinforces and / or stiffens the flexible elastomer membranes. In this way, the cage prevents the flexible elastomeric membranes from deforming under pressure in such a way that the chambers leak. The cage is advantageously cohesively connected to the elastomer body. In an advantageous embodiment, the outer part is formed out as a tube or sleeve. The inner part can be designed as a tube or as a tube with partial thickenings or depressions. For example, the outer part and / or the inner part can be produced using an extrusion process or a casting process. An outer part and / or inner part produced in a casting process is preferably produced by means of aluminum die casting. If the outer part and / or the inner part are manufactured in a casting process, the outer part and / or the inner part can be provided with additional geometries, such as thickenings or projections, which can act as stop surfaces, for example. The inner part and / or the outer part made of metal or plastic or a hybrid material made of metal and plastic are also advantageous. The inner part can also be referred to as a core, inner tube or inner sleeve. The outer part can also be referred to as an outer tube or outer sleeve. In an advantageous embodiment, the inner part has a through opening by means of which the hydraulically damping bearing can be connected to a vehicle part via a bolt. In an advantageous embodiment, the hydraulically damping bearing is pressed into a receiving eye via the outer part.

Attenuation advantageously takes place via the channel. The channel can also be referred to as a damping channel. The channel can be introduced into the elastomer body. Furthermore, the cage can advantageously receive or form the channel in whole or in part. Furthermore, the hydraulically damping bearing can have a decoupling channel which connects the chambers to one another. In an advantageous embodiment, the cage forms the decoupling channel.

In an advantageous embodiment, a height of the support device corresponds to between approximately 30% and approximately 80% of the height of the sealing device in the non-calibrated state. Furthermore, a height of the support device advantageously corresponds to between approx. 30% and approx. 50% of the height of the sealing device in the non-calibrated state. During calibration, the sealing device is only compressed to the level of the calibrated support device and is thus not exposed to excessive mechanical loads and thus crushing. As a result, the sealing device is not damaged during calibration, so that the hydraulically damping bearing ensures an adequate sealing function. In an advantageous embodiment, the sealing device is formed from at least one circumferential sealing lip. The circumferential sealing lip reliably seals the fluid-filled chambers. The circumferential sealing lip is advantageously arranged directly adjacent to the support device. The sealing lip is also advantageously seated on the cage. The sealing lip is advantageously made of a single material and is formed in one piece from the elastomer of the elastomer body.

In an advantageous embodiment, the sealing device is arranged between the chambers and the support device or viewed from the chambers on the other side of the support device. As a result, a reliable sealing of the fluid-filled chambers is achieved. When the sealing device is arranged between the chambers and the supporting device, the sealing device is compressed onto the fleas of the supporting device. If the sealing device is arranged on the other side of the support device as viewed from the chambers, then the sealing device is arranged outside the chambers.

In an advantageous embodiment, the support device is formed from a plurality of elevations of the cage, which are ge separated from one another by spaces. Thus, the fleas of the sealing lip are only compressed onto the fleas of the elevations during the calibration. Since the elevations are spaced apart, venting of the sealing device is made possible during the filling process of the vulcanization mold with elastomer in production via the spaces, even if the vulcanization mold presses on the support points to keep them free of elastomer. This avoids leakage errors during production and, as a result, leaks. Support points that are free of elastomer or only have a very thin elastomer layer are advantageous because they ensure a calibration process with little process fluctuations with regard to the final dimension of the bearing after calibration. In a further advantageous embodiment, the interstices of the cage have a uniform extent, so that the elevations are arranged at equidistant spacings from one another. Furthermore, intermediate spaces can advantageously have different dimensions so that the elevations are arranged at different distances from one another. In an advantageous embodiment, the elevations have a rectangular basic shape that follows a circumferential curvature of the outer part. This enables the outer part to be supported over a large area during calibration.

In an advantageous embodiment, the elevations have a circumferential bevel at their ends facing the outer part. The all-round bevels make it easier to slide the outer part onto the cage.

In an advantageous embodiment, the elevations are laterally bordered by the elastomer of the elastomer body. As a result, the contact between the vulcanization mold and the coated cage on the support points on the outer circumference of the elevations is limited, and mold contamination by sticking adhesive is limited to these contact areas. The spaces between the elevations of the cage on the vulcanized construction are also advantageously filled with elastomer. This means that the vulcanization mold, which must accommodate the support points, can be designed as a groove, in particular as an annular groove, in this area, instead of having to work out elevations in the vulcanization mold within the groove. Fiering the vulcanization mold is inexpensive and a mechanical cleaning of the vulcanization mold in the contact areas of the elevations with the vulcanization mold is simplified, since this contamination is not arranged in individual recessed segments of the vulcanization mold, but in a circumferential groove in the vulcanization mold.

In an advantageous embodiment, the cage has two rings which are connected to one another via at least one web, each ring having a support device. The rings are advantageous in the area of the expandable soft

Arranged elastomeric membranes. This makes the rings strengthen the

Elastomeric membranes. Furthermore, the web advantageously forms the channel connecting the chambers to one another. In addition, a decoupling channel connecting the two chambers to one another can be introduced into the web. In an advantageous embodiment, the two rings are connected to one another via two webs. In an advantageous embodiment, the rings and the webs are provided with support devices. The cage made of plastic or metal is advantageous. In an advantageous embodiment, each ring is assigned a sealing device which is arranged adjacent to the support device. The sealing lips are also advantageously seated on the cage, in particular the rings, immediately adjacent to the supporting devices.

A hydraulically damping bearing and further features and advantages are explained in more detail below with the aid of exemplary embodiments that are shown schematically in the figures. Here shows:

Fig. 1 shows a cross section through a hydraulically damping bearing with egg nem cage according to a first embodiment;

2 shows a cross section through the hydraulically damping bearing shown in FIG. 1 without an outer part;

FIG. 3 shows an enlarged illustration of the detail III in FIG. 2;

Figure 4 is a perspective view of the cage of Figure 1; and

Fig. 5 is a plan view of a cage according to a second embodiment.

1 shows a hydraulically damping bearing 10 which is used to support a vehicle part (not shown), such as a chassis part or a vehicle assembly, on a vehicle body (not shown).

The hydraulically damping bearing 10 has an inner part 12, an outer part 16 surrounding the inner part 12 with the formation of a gap 14, and an elastomeric body 18 which is arranged in the gap 14 and elastically connects the inner part 12 and the outer part 16 with one another.

The inner part 12 is made of metal or plastic or a hybrid material made of metal and plastic and has a through opening 20 by means of which the hydraulically damping bearing 10 can be connected to a vehicle part via a bolt, not shown. The outer part 16 is made of metal or plastic and in the present case is designed as an outer sleeve 22, by means of which the hydraulically damping bearing 10 is inserted, in particular pressed into, into a receiving eye (not shown) of a vehicle body. The outer part 16 is plastically deformable and can thus be calibrated in order to compress the elastomer body 18 and thus adjust the rigidity of the bearing 10. During the calibration, a force is applied to the outer part 16, so that its outer diameter and / or inner diameter is reduced.

The elastomer body 18 divides the intermediate space 14 into at least two fluid-filled chambers 24a, 24b, which are connected to one another via at least one channel, not shown. As can be seen in FIGS. 1 and 2, the elastomer body 18 has two flexible elastomer membranes 26a, 26b which delimit the two chambers 24a, 24b at the front.

To reinforce the elastomer body 18, in particular the expandable soft

Elastomer diaphragms 26a, 26b, a cage 28 is introduced into the elastomer body 18, which is shown in FIG. The cage 28 is made of plastic or metal and has two rings 30a, 30b and two webs 32a, 32b connecting the rings 30a, 30b to one another. As can be seen in FIGS. 1 and 2, the rings 30a, 30b are arranged in the area of the free ends of the elastomer membranes 26a, 26b and / or are embedded in them.

The cage 28 also has a support device 36 which is segmented and is used to ensure that the outer part 16 can only be calibrated to the height of the support device 36. As can be seen in particular in FIG. 4, the support device 36 has a large number of elevations 38 and spaces 40 which are arranged on the rings 30a, 30b and the webs 32a, 32b.

To seal the chambers 24a, 24b, the elastomer body 18 has two circumferential sealing lips 34a, 34b which sit on the cage 28, in particular on the rings 30a, 30b and are arranged immediately adjacent to the elevations 30 seated on the rings 30a, 30b are. As can be seen in particular in FIGS. 2 and 3, the sealing lips 34a, 34b protrude beyond the elevations 38, where the elevations 38 have a height that is between approx. 30% and approx. 80%, in particular between approx. 30% and approx 50% of the height of the sealing lips 34a, 34b when not calibrated. During calibration, the sealing lips 34a, 34b are only compressed to the height of the elevations 38, so that excessive mechanical stress and thus excessive squeezing of the sealing lips 34a, 34b are avoided. In addition, the spaces 40 enable the sealing lips 34a, 34b to be vented so that leakage errors during production and, as a result, leaks can be avoided.

As can be seen in FIG. 3, the elevations 38 have a rectangular basic shape and are provided with a circumferential bevel 42 at their free end. The elevations 38 are framed by the elastomer of the elastomer body, the bevel 40 preventing the outer part 16 from tilting during assembly.

A second embodiment of the cage 28 is explained below, the same reference symbols being used for identical or functionally identical parts.

The second embodiment of the cage 28 shown in FIG. 5 differs from the first embodiment in that the elevations 38 have a smaller spacing from one another. As a result, the spaces 40 are formed as thin ne channels.

The bearing 10 is characterized by the segmented support device 36, which is almost as high as the sealing lips 34a, 34b. The task of the segments is that the sealing lips 34a, 34b are only compressed to the level of the support device 36 during the calibration. In addition, by providing a segmented support device 36 on the cage 28 during the calibration of the outer part 16, compressive forces can be transferred to the cage 28 without severely squeezing and thus damaging the sealing lips 34a, 34b. In addition, the segmentation of the support device 36 enables the sealing lips 34a, 34b to be vented via the spaces 40. The support device 36 also creates additional, radially protected installation space for the sealing lips 34a, 34b so that they can be made higher. List of reference symbols

warehouse

inner part

Space

Outer part

Elastomer body

Through opening

Outer sleeve

a chamber

b chamber

a elastomer membrane

b elastomeric membrane

Cage

a ring

b ring

a bridge

b bridge

a sealing lip

b sealing lip

Support device

Surveys

Space

chamfer

Claims

Expectations

1. Hydraulically damping bearing (10) for mounting a vehicle part on a vehicle body, having an inner part (12), an outer part (16) surrounding the inner part (12) with the formation of an intermediate space (14) and which can be calibrated by reducing its diameter, and egg NEN elastomer body (18) which is arranged in the intermediate space (14) and the inner part (12) and the outer part (16) elastically connected to one another, wherein the elastomer body (18) the intermediate space (14) in at least two with one Fluid-filled chambers (24a, 24b) which are connected to one another via at least one channel, the elastomer body being reinforced by a cage (28) which has at least one protruding support on an outer peripheral surface facing the outer part (16) direction (36), wherein the elastomer body (18) is provided with at least one sealing device which is arranged adjacent to the Abstützeinrich device (36) and the chambers (24a, 24b) abdic htet, wherein the sealing device in the non-calibrated state protrudes beyond the support device (36) and wherein the support device (36) is designed in a segmented manner.

2. Hydraulically damping bearing (10) according to claim 1, characterized in that a height of the support device (36) between about 30% and about 80% of the height of the sealing device in the uncalibrated state corresponds to.

3. Hydraulically damping bearing (10) according to claim 1 or 2, characterized in that the sealing device is formed from at least one umlau Fenden sealing lip (34a; 34b).

4. Hydraulically damping bearing (10) according to one of the preceding claims, characterized in that the sealing device between the chambers (24a, 24b) and the support device (36) or of the Chambers (24a, 24b) viewed from outside of the support device (36) is arranged.

5. Hydraulically damping bearing (10) according to one of the preceding claims, characterized in that the supporting device (36) is formed from egg ner plurality of elevations (38) of the cage (28), which are separated by inter mediate spaces (40) are.

6. Hydraulically damping bearing (10) according to claim 5, characterized in that the elevations (38) have a rectangular basic shape which follows a circumferential curvature of the outer part (16).

7. Hydraulically damping bearing (10) according to claim 5 or 6, characterized in that the elevations (38) are laterally bordered by the elastomer of the elastomer body (18) and the spaces (40) between tween the elevations (38) with elastomer are filled out.

8. Hydraulically damping bearing (10) according to one of the preceding claims, characterized in that the cage (28) has two rings (30a, 30b) which are connected to one another via at least one web (32a, 32b), each of which Ring (30a, 30b) has a support device (36).

9. Hydraulically damping bearing (10) according to claim 8, characterized in that each ring (30a, 30b) has a sealing device zugeord net, which is arranged adjacent to the support device (36).