CN113906236B

CN113906236B - Hydraulic damping support

Info

Publication number: CN113906236B
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: 2023-05-30
Anticipated expiration: 2040-02-28
Also published as: CN113906236A; DE102019109212A1; WO2020207661A1; EP3953606A1

Abstract

The invention relates to a hydraulic damping support (10) for supporting 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 elastomer (18) which is arranged in the recess (14) and which connects the inner part (12) and the outer part (16) elastically, wherein the elastomer (18) divides the recess (14) into at least two fluid-filled chambers (24 a,24 b), which are connected by at least one channel, wherein the elastomer (18) is reinforced with a cage (28) which has at least one protruding support means (36) on the outer circumference facing the outer part (16), wherein the elastomer (18) is provided with at least one sealing element which is arranged in the vicinity of the support means (36) and seals the chambers (24 a,24 b), wherein the sealing element protrudes from the support means (36) in the uncalibrated state and the support means (36) are formed by segments.

Description

Hydraulic damping support

Technical Field

The invention relates to a hydraulic damping support for supporting a vehicle component on a vehicle body, comprising 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 which is arranged in the recess and which connects the inner part and the outer part elastically, wherein the elastomer divides the recess into at least two chambers filled with fluid, which chambers are connected by at least one channel.

Background

Hydraulic damping bearings of the type mentioned in the introduction are used in vehicles to support a chassis or a vehicle drive train on a vehicle body and to damp and/or dampen vibrations caused by road irregularities or vibrations caused by the vehicle drive train and thus to increase the driving comfort. The damping function is thus obtained, and the incoming vibrations result in a movement and a counter-relative movement of the inner member with respect to the outer member, whereby one of the chambers is contracted and the other chamber is enlarged. Thus, fluid located within the reduced chamber flows into the other chamber via the channel. 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, causes a damping effect on the incoming vibrations in opposition to the excitation amplitude of the vibrating liquid column.

The fluid-filled cavity is bounded outwardly by a distended flexible elastomeric membrane. It is known to embed so-called cages in an elastomer in order to reinforce the faulty flexible elastic membrane. 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.

A hydraulic axle beam bearing is known from DE102013204995A1, which has an inner part, an outer part and an elastomer arranged between the two parts, 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 seal groove is opposite the inner wall of the outer member, wherein the seal groove is filled with an elastomeric material.

Furthermore, a hydraulic damping bushing support with an intermediate ring is known from EP1291549A1, which is provided with circumferential projections, wherein the elastomer forms a dome in the region of the circumferential projections for sealing the fluid-filled chamber.

Furthermore, DE102006025251B4 discloses a hydraulic damping rubber bushing support having a metallic inner part, an elastic support body surrounding the inner part, an outer part for reinforcing the support body and at least two expansion chambers arranged in the support body for receiving a fluid damping medium. In order to seal the bulge cavity, the carrier body has a sealing projection.

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

In order to avoid damage to the sealing lips, DE102007034475B4 proposes a hydraulic damping support which is composed of an elastomer, a vulcanized half-shell-shaped two-part intermediate sleeve, so that, due to the shape of the elastomer material between it and the inner side of the intermediate sleeve, two symmetrical diametrically opposed metallic inner pins for the chamber for receiving the hydraulic damping fluid and an outer sleeve which is pulled onto the intermediate sleeve are formed. The sealing lip which is interposed between the outer sleeve and the intermediate sleeve is vulcanized onto the two chambers, is formed in the shape of a protruding flange and is arranged in a recess of the intermediate sleeve. After the hydraulic support is 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.

Disclosure of Invention

The invention is based on the task of providing a hydraulic damping support which has an improved seal when calibrated by an outer part.

To accomplish this task, a hydraulic damping bearing is proposed.

A hydraulic damping support for supporting a vehicle component on a vehicle body has an inner part, an outer part which surrounds the inner part with a gap being formed and can be calibrated by reducing its diameter, and an elastomer which is arranged in the gap and connects the inner part and the outer part in an elastic manner, wherein the elastomer divides the gap into at least two chambers which are filled with fluid and which are connected by at least one channel, wherein the elastomer is reinforced with a cage which has at least one protruding support means on the outer circumferential surface facing the outer part, wherein the elastomer 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 protrudes from the support means in the non-calibrated state and the support means is formed in sections.

The bearing according to the invention is characterized in that a segmented support mechanism is provided. The task of the segments is that the sealing element is only compressed approximately to the height of the support means, in particular the calibrated support means, during calibration. The support mechanism thus prevents the sealing member from being squeezed and thereby damaged at a dangerous level. In the calibration, the outer diameter of the outer part and/or the outer diameter of the cage is reduced, wherein the elastomer provided between the inner part and the cage is compressed or calibrated. Thereby, the elastomeric and thus the rigidity and the service life of the support are adjusted. When the outer diameter of the support mechanism is reduced, one mentions a calibrated support mechanism or a calibrated cage.

In addition, the segments of the support mechanism allow elastomeric material to flow through the recesses or voids between the segments during production and the sealing member vents through the voids during the filling process. Thereby overflow defects and further incompact at the seal during production can be avoided. This overflow defect is facilitated when the air, which was pushed by the elastomeric material flow front first, cannot escape immediately after the seal, because the vulcanization mould presses onto the encircling support means which is not segmented, in order to keep the support means free of elastomeric material, so that the outer sleeve can be pressed directly onto the outer part during the calibration process. Furthermore, the support mechanism is configured such that the calibration force is not conducted into the cage via the seal from the outer member, but rather the force is conducted into via the support mechanism. The support mechanism thus provides the sealing element with additional installation space that is protected from calibration, so that it can be designed higher.

Here, a segment means that the entire structure is divided into individual segments, wherein the segments are separated from one another by gaps or indentations. The segmented support means thus consist of alternating protrusions and recesses or voids.

By calibrating is meant here applying a force, in particular a pressure, to the outer part, whereby the outer and/or inner diameter of the outer part and the diameter of the cage are reduced to the same extent in order to induce compressive stresses in the elastomer material placed in the cage, thus calibrating its rigidity and service life. Accordingly, the non-aligned state refers to a state corresponding to the manufacturing state of the outer member. The calibrated state thus refers to a state that exists when a force is applied to the outer member and its outer and/or inner diameter has permanently contracted.

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

Advantageously, the sealing member is arranged in close proximity to the support mechanism. The sealing element can be made of an elastomer in a material-integrated one-piece manner. In addition, the sealing member may be a separate piece. The sealing member is advantageously composed of an elastomeric material.

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

In an advantageous embodiment, the outer part is designed as a tube or sleeve. The inner part may be designed as a tube or as a tube with a partial thickening or depression. Thus, the outer and/or inner member may be manufactured in an extrusion process or a casting process. The outer part and/or the 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 geometric shapes, such as a thickening or a projection, which can act as a stop surface, for example. Advantageously, the inner and/or outer part is made of a metal or plastic or a composite of metal and plastic. The inner side member may also be referred to as a core, an inner tube or an inner sleeve. The outer member may also be referred to as an outer tube or sleeve. In one advantageous embodiment, the inner part has a through-hole, by means of which the hydraulic damping mount can be connected to the vehicle component by means of a pin. In one advantageous embodiment, the hydraulic damping mount is pressed into the receiving opening by the outer part.

Advantageously, damping takes place through this 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 house or form the channel. Furthermore, the hydraulic damping support may have an isolating channel which communicates the chambers. In an advantageous embodiment, the cage forms the isolation channel.

In an 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. Also advantageously, the height of the support means corresponds to about 30% to about 50% of the height of the sealing member in the non-calibrated state. The sealing element is compressed only to the height of the calibrated support means during calibration, and is thus not subjected to excessive mechanical loads and thus to compression. The sealing element is thereby 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, the circumferential sealing lip is arranged next to the support means. Advantageously also, the sealing lip rests on the cage. The sealing lip is advantageously formed from an elastomeric elastomer material in a material-unified 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 arranged between the cavity and the support means, the sealing member is compressed to the height of the support means. When the sealing member is arranged on the side of the support mechanism as seen from the cavity side, the sealing member is arranged outside the cavity.

In one advantageous embodiment, the support means is formed by a plurality of projections of the cage, which projections are separated from one another by gaps. Thus, the seal lip height is compressed only to the boss height during calibration. Because the projections are spaced apart from each other, the sealing member is allowed to vent through the void during the process of filling the vulcanization mold with elastomeric material in production, even if the vulcanization mold is pressed onto the support site to keep it free of elastomeric material. This prevents overflow defects and further incompact production. The support points, which are free of elastomeric material or have only a very thin elastic layer, are advantageous because they ensure a calibration process together with slight process fluctuations after calibration that are related to the final dimensions of the support. In a further advantageous embodiment, the recesses of the cage have the same extension, so that the projections are arranged equidistant from one another. Advantageously, the recesses can have different extension dimensions, so that the projections are arranged at different mutual distances.

In one advantageous embodiment, the projection has a rectangular basic shape which follows the curvature of the peripheral surface of the outer part. Thereby allowing for large area support of the outer member during calibration.

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

In one advantageous embodiment, the projections are laterally surrounded by an elastomeric material of the elastomer. Thereby, the contact between the vulcanization mold and the coated cage is limited to the bearing points which are supported on the outer circumference side on the projections, and the mold dirt caused by the burnt adhesion promoter is limited to the contact area. It is also advantageous that the interstices between the projections of the cage are filled with elastomeric material on the member being vulcanized. This results in that the vulcanization mold, which has to accommodate the bearing points, can be designed as a groove, in particular an annular groove, in this region, instead of the groove having to be further provided with a projection in the working mold. The production of the vulcanization mold is thus inexpensive and the mechanical cleaning of the vulcanization mold in the contact area where the projections contact the vulcanization mold is simplified, since the dirt is not arranged in a separate recess section of the vulcanization mold but in a surrounding groove in the vulcanization mold.

In an advantageous embodiment, the cage has two rings which are connected to one another by at least one connecting strip, wherein each ring has a support mechanism. Advantageously, the rings are arranged in the region of the inflated soft elastic membrane. Whereby the ring reinforces the elastic membrane. The tie advantageously also forms a channel that communicates the chambers. In addition, an isolation channel with two cavities communicated can be formed in the connecting strip. In an advantageous embodiment, the two rings are connected to one another by two connecting strips. In an advantageous embodiment, the ring and the connecting strip are provided with support means. The cage is advantageously composed of plastic or metal.

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

Drawings

The hydraulic damping support, as well as other features and advantages, are described in detail below in connection with the embodiments schematically shown in the drawings, which in this case show:

FIG. 1 shows a cross section of a hydraulic damping support with a cage according to a first embodiment;

FIG. 2 shows a cross section of the hydraulic damping support 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.

Detailed Description

In fig. 1, a hydraulic damping support 10 is shown for supporting a vehicle component, not shown, such as a chassis or a vehicle power train, for example, on a vehicle body, not shown.

The hydraulic damping mount 10 has an inner part 12, an elastomer 18, which is arranged in the recess 14 and which connects the inner part 12 and the outer part 16 elastically to one another, and an outer part 16 which surrounds the inner part 12 in the case of the recess 14.

The inner part 12 is composed of metal or plastic or a composite of metal and plastic and has a through-hole 20, by means of which the hydraulic damping mount 10 can be connected to the vehicle component by means of a screw, 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, in particular pressed, into a receiving opening of the vehicle body, not shown. The outer member 16 may be plastically deformed and thus may be calibrated to compress the elastomer 18 and thereby adjust the rigidity of the support 10. During 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 channel, not shown. As can be seen in fig. 1 and 2, the elastomer 18 has two inflated, soft,

elastic membranes

26a, 26b, which delimit the two

chambers

24a,24b on the end side.

To stiffen the elastomer 18, in particular the inflated flexible

elastic membranes

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

rings

30a,30b and two

tie bars

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 regions of the

elastic films

26a, 26b and/or embedded therein.

The cage 28 also has a support mechanism 36 which is formed in sections and serves to permit the outer member 16 to be aligned 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

webs

32a,32 b.

To seal the

chambers

24a,24b, the elastomer 18 has two

circumferential sealing lips

34a, 34b which rest on the cage 28, in particular on the

rings

30a,30b, and are arranged next to the projections 30 which rest on the

rings

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

lips

34a, 34b protrude from the projection 38, wherein the projection 38 has a height which corresponds to between about 30% and about 80%, in particular between about 30% and about 50%, of the height of the sealing

lips

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

lips

34a, 34b are compressed only to the height of the projection 38 during the calibration, so that the sealing

lips

34a, 34b are prevented from being subjected to too high mechanical loads and thus to too high a compression. In addition, the gap 40 allows ventilation of the sealing

lips

34a, 34b, so that overflow defects and further incompact during production can be avoided.

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

A second embodiment of the cage 28 will be described below, wherein 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 from one another. Whereby the void 40 is formed in a fine channel shape.

The support 10 is characterized by segmented support means 36 which are almost as high as the sealing

lips

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

lips

34a, 34b are compressed only to the level of the support means 36 during calibration. Furthermore, by providing a segmented support mechanism 36 on the cage 28, pressure is applied to the cage 28 during calibration of the outer member 16 without strong compression and subsequent damage to the sealing

lips

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

lips

34a, 34b to vent through the void 40. Furthermore, the support means 36 provides additional radial protected installation space for the sealing

lips

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

List of reference numerals

10. Support for a vehicle

12. Inner side piece

14. Void space

16. Outer side piece

18. Elastic body

20. Through hole

22. Outer sleeve

24a cavity

24b cavity

26a elastic film

26b elastic film

28. Cage

30a ring

30b ring

32a connecting strip

32b connecting strip

34a sealing lip

34b sealing lip

36. Supporting mechanism

38. Protrusions

40. Void space

42. Bevel edge

Claims

1. A hydraulic damping bearing (10) for supporting a vehicle component on a vehicle body, the hydraulic damping bearing (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 the formation of a gap and being able to be calibrated by reducing its diameter, the elastomer body (18) being arranged in the gap and connecting the inner part (12) and the outer part (16) in an elastic manner, wherein the elastomer body (18) divides the gap into at least two chambers (24 a,24 b) filled with fluid, which communicate with one another via 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 surface facing the outer part (16), wherein the elastomer body (18) is provided with at least one sealing member which is arranged adjacent to the support means (36) and which sealing means (24 a,24 b) are arranged adjacent to one another and in the sealing means, wherein the protruding means (36) are in the gap-forming state of the support means (24 b), and wherein the segments (36) are not completely separated from one another by the gap.

2. The hydraulic damping support (10) according to claim 1, characterized in that the height of the support means (36) corresponds to between 30% and 80% of the height of the sealing member in an uncalibrated state.

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

4. The hydraulic damping bearing (10) according to claim 1, characterized in that the sealing member is arranged between the cavity (24 a,24 b) and the support mechanism (36) or outside the support mechanism (36) as seen from the cavity (24 a,24 b).

5. The hydraulic damping support (10) of claim 1, 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 damping support (10) of claim 5, wherein the projection (38) has a rectangular basic shape following the curvature of the peripheral surface of the outer member (16).

7. The hydraulic damping support (10) according to claim 5 or 6, characterized in that the projections (38) are laterally surrounded by the elastomeric material of the elastomer (18), and the gaps (40) between the projections (38) are filled with the elastomeric material.

8. The hydraulic damping mount (10) according to claim 1, wherein the cage (28) has two rings (30 a,30 b) connected to each other by at least one tie (32 a,32 b), wherein each ring (30 a,30 b) has a support mechanism (36).

9. The hydraulic damping mount (10) according to claim 8, wherein each ring (30 a,30 b) is assigned a sealing element arranged adjacent to the support means (36).