CN113906236A

CN113906236A - Hydraulic damping support

Info

Publication number: CN113906236A
Application number: CN202080040352.3A
Authority: CN
Inventors: P·维尔纳; H·卡多斯; O·布赖登
Original assignee: Vibracoustic SE
Current assignee: Vibracoustic SE
Priority date: 2019-04-08
Filing date: 2020-02-28
Publication date: 2022-01-07
Anticipated expiration: 2040-02-28
Also published as: CN113906236B; DE102019109212A1; EP3953606A1; WO2020207661A1

Abstract

The invention relates to a hydraulic damping mount (10) for mounting a vehicle component on a vehicle body, comprising an inner part (12), an outer part (16) which surrounds the inner part (12) with the formation of a recess (14) and can be calibrated by reducing its diameter, and an elastic body (18) which is arranged in the recess (14) and elastically connects the inner part (12) to the outer part (16), wherein the elastic body (18) divides the recess (14) into at least two fluid-filled chambers (24a,24b) which communicate via at least one channel, wherein the elastic body (18) is reinforced with a cage (28) which has at least one projecting support means (36) on the outer circumferential surface facing the outer part (16), wherein the elastic body (18) is provided with at least one spring element which is arranged in the vicinity of the support means (36) and seals the chambers (24a,24b) wherein the sealing element protrudes from the support means (36) in the non-aligned state and the support means (36) are constructed in segments.

Description

Hydraulic damping support

The invention relates to a hydraulic damping mount for mounting a vehicle component on a vehicle body, comprising an inner part, an outer part which surrounds the inner part in the form of a recess and can be calibrated by reducing its diameter, and an elastomer body which is arranged in the recess and elastically connects the inner part and the outer part, wherein the elastomer body divides the recess into at least two chambers which are filled with a fluid and which communicate with one another via at least one channel.

Hydraulic damped mounts of the type mentioned in the introduction are used in vehicles to mount chassis parts or vehicle drive trains on the vehicle body and to damp and/or damp vibrations caused by road irregularities or vehicle drive trains and thus to improve driving comfort. A damping function is thus obtained, the incoming vibrations causing a movement and an opposite relative movement of the inner part with respect to the outer part, whereby one of the chambers is reduced and the other chamber is enlarged. Whereby fluid located in the reduced chamber flows through the passage into the other chamber. The flow resistance opposite to the flow direction in the channel generates in this case a damping which, in the vicinity of the natural frequency, produces a damping effect on the incoming vibrations in opposition to the excitation amplitude of the vibrating liquid column.

The fluid-filled cavity is delimited externally by a ballooning soft elastic membrane. In order to reinforce the failing flexible elastic membrane, it is known to embed so-called cages in the elastomer. To prevent leakage of the fluid-filled chambers, they must be sealed from the environment. The elastic membrane is provided for this purpose with a sealing lip which rests on the cage.

DE102013204995a1 discloses a hydraulic axle support having an inner part, an outer part and an elastomer body arranged therebetween, which is provided with a plastic cage, wherein the plastic cage has at least one sealing groove, which is arranged on the outer surface of the plastic cage. The sealing groove is opposite to the inner wall of the outer part, wherein the sealing groove is filled with an elastomer material.

Furthermore, EP1291549a1 discloses a hydraulic damping bushing support with an intermediate ring which is provided with a circumferential bead, wherein the elastomer forms a dome in the region of the circumferential bead in order to seal off a fluid-filled chamber.

Furthermore, DE102006025251B4 discloses a hydraulic damping rubber bushing support with a metal inner part, an elastic support body surrounding the inner part, an outer part for reinforcing the support body and at least two bulging chambers arranged in the support body for accommodating a fluid damping medium. For sealing the inflation chamber, the support body has a sealing projection.

In order to adjust the rigidity of the hydraulic damping mount, the hydraulic damping mount is calibrated because the outer diameter of the outer member is reduced. Whereby the elastomer is compressed and introduces a pretension. During calibration, the sealing lip is subjected to high mechanical loads, which may lead to damage of the sealing lip.

In order to avoid damage to the sealing lips, DE102007034475B4 proposes a hydraulic damping bearing which is surrounded by an elastomer, a two-part intermediate sleeve which is vulcanized in half shell form, so that, because of the shape of the elastomer material between it and the inner side of the intermediate sleeve, two symmetrical, diametrically opposed metal inner pins for receiving a hydraulic damping fluid are formed, and an outer sleeve which is pulled onto the intermediate sleeve. The sealing lips which are connected between the outer sleeve and the intermediate sleeve are vulcanized onto the two chambers, are formed in the shape of a projecting flange and are arranged in a recess of the intermediate sleeve. After the hydraulic bearing has been installed, the sealing lip is calibrated or adjusted so that a reduction of the inner diameter of the outer sleeve and thus an increase in the pressure acting on the sealing lip is obtained.

The invention is based on the object of providing a hydraulic damping bearing which has an improved sealing when it is calibrated by means of an outer part.

To achieve this object, a hydraulic damping mount is proposed with the features of claim 1.

Advantageous embodiments of the hydraulic damping bearing are the subject matter of the dependent claims.

A hydraulic damping mount for mounting a vehicle component on a vehicle body has an inner part, an outer part which surrounds the inner part with the formation of a recess and can be calibrated by reducing its diameter, and an elastomer body which is arranged in the recess and elastically connects the inner part and the outer part, wherein the elastomer body divides the recess into at least two chambers which are filled with fluid and which communicate with one another via at least one passage, wherein the elastomer body is reinforced with a cage which has at least one projecting support means on its outer circumferential surface facing the outer part, wherein the elastomer body is provided with at least one sealing element which is arranged in the vicinity of the support means and seals the chambers, wherein the sealing element projects beyond the support means in the non-calibrated state and the support means are constructed in segments.

The bearing according to the invention is characterized in that a segmented support means is provided. The task of the segment is that the sealing part is only compressed during calibration to approximately the height of the support means, in particular the calibrated support means. The support means thus prevent the sealing component from being pressed and thus damaged to a dangerous extent. During calibration, the outer diameter of the outer part and/or the outer diameter of the cage is reduced, wherein the elastic body arranged between the inner part and the cage is compressed or calibrated. Thereby, the rigidity and the service life of the elastomer and thus of the bearing are adjusted. When the outer diameter of the support means is reduced, reference is made to calibrated support means or calibrated cages.

In addition, the segments of the support mechanism allow the elastomeric material to flow through the recesses or voids between the segments during production and the sealing member to vent via the voids during the filling process. Overflow defects and thus lack of tightness at the seal during production can thereby be avoided. This overflow defect is promoted when the air pushed by the elastomer material flow front cannot escape immediately after the seal, since the vulcanization mould presses onto the surrounding support means which are not segmented, to keep the support means free of elastomer material, so that the outer sleeve can be pressed directly onto the outer element during the calibration process. Furthermore, the support means cause the aligning force to be conducted from the outer side part not via the seal into the cage, but rather via the support means. The support device therefore provides additional structural space for the sealing element, which is protected against alignment, so that it can be designed higher.

By segmented is here meant that the surrounding complete structure is divided into a plurality of individual segments, wherein the segments are separated from each other by gaps or gaps. Thus, the segmented support mechanism is comprised of alternating projections and recesses or voids.

Calibration means here that a force, in particular a pressure, is applied to the outer part, which is reduced to the same extent by the outer and/or inner diameter of the outer part and the diameter of the cage, in order to induce compressive stresses in the elastomeric material seated in the cage, thus adjusting its rigidity and service life. Accordingly, the unaligned state refers to a state that corresponds to the manufactured state of the outer member. A calibrated state thus refers to a state which exists when a force is applied to the outer part and its outer and/or inner diameter has been permanently reduced.

In an advantageous embodiment, the support means is provided with only a thin elastic layer or a thin rubber coating, preferably even without an elastic layer or a rubber coating. In this way, large forces, in particular pressure forces, can be transmitted to the cage during the calibration of the outer part, which leads to a reduction of the outer diameter of the cage and thus to a calibration of the bearing and/or the cage.

Advantageously, the sealing member is arranged in close proximity to the support means. The sealing element can be made of an elastomer in a material-uniform one-piece manner. Alternatively, the sealing member may be a separate piece. The sealing member is advantageously made of an elastomeric material.

In an advantageous embodiment, the elastomer has an elastic membrane, which is preferably designed to be flexible and delimits the cavity at the end face. The cage serves to reinforce the elastomer, in particular the ballooning soft elastic membrane, by reinforcing and/or stiffening the ballooning soft elastic membrane. The cage thus prevents the bulging soft elastic membrane from deforming under pressure, so that the cavity overflows. The cage is advantageously connected to the elastomer in a material-bonded manner.

In one advantageous embodiment, the outer part is designed as a tube or sleeve. The inner side part can be designed as a tube or as a tube with a local thickening or indentation. Thus, the outer part and/or the inner part may be manufactured in an extrusion method or a casting method. The outer and/or inner part produced in the casting method is preferably produced by means of aluminum die casting. When the outer and/or inner part is produced in a casting process, the outer and/or inner part can have additional geometries, such as thickening or projections, which can serve, for example, as stop surfaces. It is also advantageous if the inner and/or outer part consists of a metal or plastic component or a composite of metal and plastic. The inner member may also be referred to as a core, inner tube or inner sleeve. The outer member may also be referred to as an outer tube or sleeve. In an advantageous embodiment, the inner part has a through-opening, by means of which the hydraulic damping bearing can be connected to the vehicle component by means of a pin. In an advantageous embodiment, the hydraulic damping mount is pressed into the receiving bore by the outer part.

Advantageously, damping is performed through the channel. This channel may also be referred to as a damping channel. The channel may be incorporated into the elastomer. Also advantageously, the cage may fully or partially accommodate or form the channel. In addition, the hydraulic dampening bearing may have an isolation channel that communicates the chambers. In an advantageous embodiment, the cage forms the isolating channel.

In one advantageous embodiment, the height of the support means corresponds to about 30% to about 80% of the height of the sealing element in the non-aligned state. It is also advantageous that the height of the support means corresponds to about 30% to about 50% of the height of the sealing member in the un-calibrated state. The sealing element is compressed during calibration only to the height of the calibrated support means and is not subjected to excessive mechanical loads and thus to compression. Thereby, the sealing component is not damaged during calibration, so that the hydraulic damping support ensures a sufficient sealing function.

In one advantageous embodiment, the sealing element is formed by at least one circumferential sealing lip. The surrounding sealing lip reliably seals the fluid-filled chamber. Advantageously, a circumferential sealing lip is arranged next to the support means. It is also advantageous for the sealing lip to rest on the cage. The sealing lip is advantageously made of an elastomeric elastomer material in a material-uniform one-piece manner.

In an advantageous embodiment, the sealing element is arranged between the chamber and the support means or on the side of the support means as seen from the chamber side. Thereby, a reliable sealing of the fluid-filled cavity is obtained. When the sealing member is disposed between the cavity and the support mechanism, the sealing member is compressed to the height of the support mechanism. The seal member is disposed outside the chamber when the seal member is disposed on the support mechanism side as viewed from the chamber side.

In an advantageous embodiment, the support means are formed by a plurality of projections of the cage, which projections are separated from one another by gaps. Thus, the seal lip height is only compressed to the bump height during calibration. Because the projections are spaced apart from each other, the sealing part is allowed to vent via the gap during the process of filling the vulcanization mould with elastomer material in production, even if the vulcanization mould is pressed onto the bearing site to keep it free of elastomer material. Overflow defects and thus lack of tightness during production can thereby be avoided. Bearing points free of elastomer material or having only a very thin elastic layer are advantageous because they ensure a calibration process with slight process fluctuations after calibration in relation to the final dimensions of the bearing. In a further advantageous embodiment, the recesses of the cage have the same extent, so that the projections are arranged at equal distances from one another. It is also advantageous that said interspaces may have different extension dimensions, so that the projections are arranged at different mutual distances.

In an advantageous embodiment, the projection has a rectangular basic shape which follows the curvature of the circumferential surface of the outer part. This allows a large area support of the outer part during calibration.

In an advantageous embodiment, the projection has a circumferential bevel at its end facing the outer part. The surrounding beveled edge facilitates the displacement of the outer part onto the cage.

In an advantageous embodiment, the projection is laterally surrounded by an elastomer material of the elastomer. Thereby, the contact between the vulcanizing mold and the coated cage is limited to the supporting portion supported on the protrusion on the outer peripheral side, and the mold fouling caused by the burning adhesion promoter is limited to the contact area. It is also advantageous that the voids between the projections of the cage are filled with an elastomeric material on the vulcanized member. This results in that the vulcanization mold, which has to accommodate the bearing points, can be designed in this region as a groove, in particular as an annular groove, instead of the groove and the projections also having to be machined in the machining mold. Thus, the manufacture of the vulcanisation mould is cheap and the mechanical cleaning of the vulcanisation mould in the contact area where the protrusions contact the vulcanisation mould is simplified, since the soiling is not arranged in a separate recessed section of the vulcanisation mould, but in a surrounding groove in the vulcanisation mould.

In one advantageous embodiment, the cage has two rings which are connected to one another by at least one connecting web, wherein each ring has a support means. Advantageously, the rings are arranged in the region of the ballooning-soft elastic membrane. Thereby, the ring reinforces the elastic membrane. The tie bars also advantageously form channels that communicate the chambers. In addition, an isolation channel through which the two cavities communicate can be opened into the connecting strip. In one advantageous embodiment, the two rings are connected to one another by two webs. In an advantageous embodiment, the ring and the connecting strip are provided with a support means. The cage is advantageously made of plastic or metal.

In an advantageous embodiment, a sealing element is associated with each ring, which sealing element is arranged adjacent to the support means. The sealing lip advantageously also rests on the cage, in particular the ring, in the immediate vicinity of the support means.

In the following, the hydraulic damping bearing and other features and advantages are explained in detail in connection with the exemplary embodiments shown in the figures, in which case:

fig. 1 shows a cross-section of a hydraulic damping bearing with a cage according to a first embodiment;

FIG. 2 shows a cross-section of the hydraulic dampening mount shown in FIG. 1 but without the outer member;

fig. 3 shows an enlarged view of detail III in fig. 2;

FIG. 4 shows a perspective view of the cage of FIG. 1; and

fig. 5 shows a top view of a cage according to a second embodiment.

Fig. 1 shows a hydraulic damping mount 10 for mounting a vehicle component, not shown, such as, for example, a chassis part or a vehicle drive train, on a vehicle body, not shown.

The hydraulic damping mount 10 has an inner member 12, an elastic body 18 and an outer member 16 surrounding the inner member 12 with the gap 14 formed, the elastic body is disposed in the gap 14, and the inner member 12 and the outer member 16 are elastically connected to each other.

The inner side part 12 is made of metal or plastic or a composite material of metal and plastic and has a through hole 20 by means of which the hydraulic damping mount 10 can be connected to a vehicle component by means of bolts, not shown.

The outer part 16 is made of metal or plastic and is designed here as an outer sleeve 22, by means of which the hydraulic damping mount 10 is inserted into, in particular pressed into, a receiving opening, not shown, of the vehicle body. The outer member 16 may be plastically deformed and thus calibrated to compress the elastomer 18 and thereby adjust the stiffness of the bearing 10. In calibration, a force is applied to the outer member 16 such that its outer and/or inner diameter is reduced.

The elastomer 18 divides the interspace 14 into at least two fluid-filled

chambers

24a,24b, which communicate with each other via at least one not shown channel. As can be seen in fig. 1 and 2, the elastomer body 18 has two ballooning-soft

elastic membranes

26a, 26b which delimit the two

chambers

24a,24b at the end faces.

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

elastic membranes

26a, 26b, a cage 28, as shown in fig. 4, is embedded in the elastomer body 18. The cage 28 is constructed of plastic or metal and has two

rings

30a,30b and two connecting

straps

32a,32b connecting the

rings

30a,30 b. As shown in fig. 1 and 2, the

loops

30a,30b are arranged in the free end region of the

elastic membrane

26a, 26b and/or embedded therein.

The cage 28 also has a support mechanism 36 which is constructed in sections and serves to align the outer side part 16 only to the height of the support mechanism 36. As shown in particular in fig. 4, the support means 36 have a plurality of projections 38 and recesses 40, which are arranged on the

rings

30a,30b and the connecting

webs

32a,32 b.

For sealing the

chambers

24a,24b, the elastomer body 18 has two

circumferential sealing lips

34a, 34b which are seated on the cage 28, in particular on the

rings

30a,30b, and are arranged in the immediate vicinity of the projections 30 which lie on the

rings

30a,30 b. As can be seen in particular in fig. 2 and 3, the sealing

lips

34a, 34b project beyond the projection 38, wherein the projection 38 has a height which corresponds to between approximately 30% and approximately 80%, in particular between approximately 30% and approximately 50%, of the height of the sealing

lips

34a, 34b in the calibration state. The sealing

lips

34a, 34b are compressed only to the height of the projection 38 during calibration, so that excessively high mechanical loads and thus excessively strong pressing of the sealing

lips

34a, 34b are avoided. In addition, the recess 40 allows ventilation of the sealing

lips

34a, 34b, so that overflow defects and thus lack of tightness during production can be avoided.

As shown in fig. 3, the projection 38 has a rectangular basic shape and has a circumferential sloping edge 42 at its free end. The projection 38 is surrounded by an elastomeric, elastomeric material, wherein the beveled edge 40 prevents the outer member 16 from skewing during installation.

A second embodiment of the cage 28 will now be described, where like reference numerals are used for like or functionally like parts.

The second embodiment of the cage 28, as shown in FIG. 5, differs from the first embodiment in that the projections 38 are closely spaced to one another. Thereby forming the gap 40 in a thin channel shape.

The bearing 10 features segmented support means 36 which are almost as high as the sealing

lips

34a, 34 b. The task of the segments is that the sealing

lips

34a, 34b are compressed only to the height of the support means 36 during calibration. Furthermore, by providing the segmented support means 36 on the cage 28, a pressure is applied to the cage 28 during the calibration of the outer part 16 without strong pressing and thus damaging the sealing

lips

34a, 34 b. In addition, the segmentation of the support mechanism 36 allows the sealing

lips

34a, 34b to be ventilated via the gap 40. Furthermore, the support means 36 provides additional radially protected installation space for the sealing

lips

34a, 34b, so that it can be designed higher.

List of reference numerals

10 support

12 inner side part

14 gap

16 outer side part

18 elastomer

20 through hole

22 outer sleeve

24a cavity

24b cavity

26a elastic film

26b elastic film

28 cages

30a ring

30b ring

32a connecting strip

32b connecting strip

34a sealing lip

34b sealing lip

36 supporting mechanism

38 bulge

40 gap

42 bevel edge

Claims

1. A hydraulic damping mount (10) for supporting vehicle components on a vehicle body, the hydraulic damping mount (10) having an inner part (12), an outer part (16) and an elastomer body (18), the outer part (16) surrounding the inner part (12) with a gap (14) formed and being calibrated by reducing its diameter, the elastomer body (18) being arranged in the gap (14) and elastically connecting the inner part (12) and the outer part (16), wherein the elastomer body (18) divides the gap (14) into at least two chambers (24a,24b) filled with a fluid, which communicate with one another by means of at least one channel, wherein the elastomer body (18) is reinforced with a cage (28) having at least one protruding support means (36) on the outer circumferential face towards the outer part (16), wherein the elastomer body (18) is provided with at least one sealing element which is arranged adjacent to the support means (36) and seals the chambers (24a,24b), wherein the sealing element protrudes beyond the support means (36) in the non-aligned state, and wherein the support means (36) are formed in sections.

2. The hydraulic dampening mount (10) according to claim 1, wherein the support mechanism (36) has a height corresponding to between about 30% and about 80% of the height of the seal member in an un-calibrated condition.

3. The hydraulic damping mount (10) according to claim 1 or 2, characterized in that the sealing means is formed by at least one circumferential sealing lip (34 a; 34 b).

4. The hydraulic dampening mount (10) according to any one of the preceding claims, wherein the sealing member is disposed between the cavity (24a,24b) and the support mechanism (36) or outside the support mechanism (36) as viewed from the cavity (24a,24 b).

5. The hydraulic dampening mount (10) according to any one of the preceding claims wherein the support mechanism (36) is comprised of a plurality of projections (38) of the cage (28), the plurality of projections (38) being separated from one another by the void (40).

6. The hydraulic dampening mount (10) according to claim 5 wherein the protuberance (38) has a rectangular basic shape following the curvature of the peripheral surface of the outer member (16).

7. The hydraulic dampening mount (10) according to claim 5 or 6, characterized in that the protrusions (38) are laterally surrounded by the elastomer material of the elastomer (18) and the voids (40) between the protrusions (38) are filled with elastomer material.

8. The hydraulic dampening mount (10) according to any one of the preceding claims, wherein the cage (28) has two rings (30a,30b) interconnected by at least one tie bar (32a,32b), wherein each ring (30a,30b) has one support means (36).

9. The hydraulic dampening mount (10) according to claim 8, wherein each ring (30a,30b) is assigned a sealing member disposed adjacent to the support mechanism (36).