DE102004059681B4 - Hydraulically damping bushing - Google Patents

Abstract

hydraulic absorbing Bearing bush with an inner part (1), which is insertable into a socket housing (10), wherein the inner part (1) has an elastomeric support body (2) for supporting a Lagerkerns (12) and the elastomeric support body (2) one with a hydraulic liquid filled first chamber region (20) and a second with this via a transfer port (30) connected Chamber region (21), and wherein a substantially radially extending elastic separating web (5) for substantially liquid-tight Separating the first chamber region (20) from the second chamber region (21) is provided, characterized in that the separating web (5) for producing a bypass flap (56), which is a direct connection of the first chamber region (20) with the second chamber region (21) bypassing the overflow channel (30) releases or blocks, has at least one cut (50), the obliquely relative to the separating web (5), and that the separating web (5) through this cut (50) into at least two parts (51, 52) is subdivided so that when loading the divider ...

Description

The The present invention relates to a hydraulic damping Bearing bush with an inner part, which is insertable into a socket housing, wherein the inner part of an elastomeric support body for supporting a Bearing core comprises and the elastomeric support body with a hydraulic liquid filled first chamber region and a second connected thereto via an overflow channel Chamber region having a substantially radially extending elastic separating web for substantially liquid-tight separation of the first chamber portion of the second chamber portion is provided.

By Introduce of the inner part in a socket housing Thus, a first and a second chamber are created, which communicate with each other via the overflow channel are connected and separated from each other by the divider on the other are. The dynamic behavior of such a bearing, ie the rigidity and attenuation values, is determined here by the channel geometry of the overflow channel.

From the DE 39 30 644 A1 It is known to provide valve-controlled auxiliary channels between the first and the second chamber, which open at impact load, ie at high amplitudes and high Bewegungsgeschwindig- speed, and thus reduce the stiffness of the socket. Due to the additional auxiliary channels and the valves to be provided, such a solution is relatively expensive to produce.

The DE 40 39 228 C1 discloses a predominantly perpendicular to its axial loadable hydraulic damping bushing with an insertable into a female housing spring body made of rubber for supporting a bearing core. The spring body has a first chamber region, which can be filled with a liquid, and a second chamber region which can be connected to the latter via an overflow channel. In each case an at least partially encircling annular channel is present in the region of the two front ends of the spring body. These end-side annular channels are connected to each other via a parallel to the bearing bush axis connecting channel, which is laterally bounded by radially extending partitions. To form the respective annular channel, a radially extending separating web runs parallel to the respective end face. In the divider, a self-switching valve may be provided, which may consist of a slot introduced in the spring body, the pressure-dependent releases a variable opening cross-section and thus influences the damping properties of the socket.

The DE 195 26 750 C2 discloses an axially damping hydraulic bushing having an elastic support body insertable into a bushing housing which includes an axial central bore for receiving a bearing core. Furthermore, the elastic support body has two fluid chambers filled with hydraulic fluid. The two chambers are connected to one another via an overflow channel. In addition, the two chambers are separated by a separator in the form of a double lip seal. For this purpose, the double lip seal has two spaced-apart sealing lips, which cooperate with a stationary abutment part. The sealing lips extend in the radial direction, form a recess between them and rest on mutually inclined bearing surface of the abutment part.

From the DE 102 48 469 A1 Bushings are known which have narrow grooves in the dividers between the chambers. Through these narrow grooves, a permanent fluid connection between the chambers or chamber areas is maintained. An embodiment shows a bearing bush with an elastic inner part, which supports a bearing core. The inner part is received with an interference fit in an outer sleeve. This inner part further forms a first chamber region and a second chamber region, which are connected to one another by means of an overflow channel. Furthermore, two radially formed and elastic dividers are provided, which cause a separation of the two chambers. The dividers have a narrow groove which divides the respective web into at least two parts. When pressurized, the elastic separation webs are deformed, whereby the permeability of the bypass channel is changed between the chambers.

task The present invention is a hydraulically damping Specify a bearing bush where the dynamic behavior at high amplitudes which is easy to manufacture and to the respective ones technical specifications is easy to customize.

to solution This object is a bearing bush with the features according to claim 1 proposed. Advantageous embodiments are the subject of dependent Claims.

Under Bypass flap is here understood a flap that the first chamber area bypassing the overflow channel can connect directly to the second chamber area. This bypass flap is opened at high amplitudes, so that liquid flow directly from one chamber area into the other chamber area can. When open Bypass flap finds the fluid exchange between the two chamber areas mainly through the bypass flap instead of.

The Invention has the advantage that by the arrangement of a relative diagonally to the divider executed Cut in a very simple way, a bypass flap are made can, which has a bypass channel between the first chamber area and the second chamber area releases. There are no particular ones here other channels or additional Provide valves. The behavior of the bypass flap can thereby different embodiments of the number of cuts and the Forming the cuts to different desired functional parameters, such as the opening pressure be set. Due to the simple design of the bypass flap this is also very reliable. By opening the Bypass flap when high fluid pressures occur or when occurring greater Amplitudes reduce the stiffness of the socket. Shock loads, such as when driving over can occur from obstacles be better absorbed by the bushing in this way. at such an oblique cut is the interface at low pressures liquid-tight, as always one Force component in the direction of "Close" acts higher Press opens the respective bypass flap. The bevel cut increases continue the contact surface between the respective parts of the divider. This also will with closed bypass flap a better seal between reached the individual parts. Due to the oblique execution of the cut is therefore the reliability of the bearing bush significantly improved.

Advantageous is the section relative to the divider at an angle of 20 degrees up to 70 degrees. Further advantageous is the section relative to the bushing axis in one Angle of 20 degrees to 70 degrees introduced.

In Another advantageous embodiment is the divider of the two Sides with liquid applied. The divider can thereby with a female housing substantially liquid-tight to lock. Furthermore you can the first chamber area and / or the second chamber area together with a socket housing each form a first chamber and / or a second chamber.

Together with the inner part is so when inserting the inner part in a socket housing achieved, on the one hand, the first and the second chamber from each other separated by the separating web substantially liquid-tight, but the bypass flap introduced in the divider immediately on the respective dynamic behavior of the bearing bush can react.

Advantageous lies the divider in a running through the bushing axis Level.

The The invention will be described in the following with reference to a drawing in the drawing illustrated embodiment explained in more detail. in the single show:

1 a perspective view of an inner part of a hydraulically damping bushing,

2 a detailed view of a cross section through the inner part of 1 .

3 a plan view of the inner part of 1 and 2 .

4 a sectional view through a bearing bush with the inner part of 1 with the bypass flap closed, and

5 the sectional view of 4 with opened bypass flap.

1 shows a perspective view of an inner part 1 a hydraulically damping bushing. The inner part 1 is in a not shown here socket housing 10 insertable. The inner part 1 has an elastomeric support body 2 on top of a storage core 12 supported.

The elastomeric support body has a first fillable with a liquid chamber area 20 and a second chamber area 21 on. The two chamber areas 20 . 21 are interconnected via an overflow channel, not shown here. A substantially radially extending elastic divider 5 is between the first compartment 20 and the second chamber area 21 arranged. The wedge-shaped divider 5 serves for the liquid-tight separation of the first chamber area 20 from the second compartment 21 ,

To form a bypass flap 56 is in the divider 5 a cut 50 arranged. This cut 50 divides the divider 5 in two parts 51 . 52 on. The cut 50 is designed relative to the bushing axis at an angle of 20 to 50 degrees and arranged approximately in the middle of the separating web.

Because the divider 5 is elastic, in this way one part 51 or the other part 52 or both parts 51 . 52 of the divider 5 be elastically deformed so that when the bypass flap open 56 a bypass channel 55 is released. When the inner part 1 in the socket housing 10 can be a fluid exchange between the first chamber area 20 and the second chamber area 21 over the bypass channel 55 occur.

In 2 is the area of the divider in egg ner detailed view shown in section. In addition to the bearing body 12 Here is also a metallic intermediate sleeve 13 indicated that to stabilize the elastomeric support body 2 serves. The inner part 1 is in the cylindrical socket housing 10 recorded, with the elastic divider 5 with the inner diameter of the socket housing 10 liquid-tight.

By inserting the inner part 1 in the socket housing 10 continue to be the first and second chamber area 20 . 21 completed, so here are chambers 20 . 21 form. The divider 5 separates the two chambers 20 . 21 liquid-tight from each other. When exceeding a certain liquid pressure, the in the separation bar 5 through the cut provided by bypass flap 56 no longer withstand the fluid pressure and the corresponding part of the divider 5 is elastically deformed against the direction of fluid pressure, so that the bypass channel 55 between the chambers 20 . 21 is released.

In 3 is a top view of the in 1 in perspective shown inside part 1 shown. Identical parts are designated here by the same reference numerals. In 3 you can clearly see that the cut 50 in the divider 5 obliquely relative to the divider and accordingly obliquely relative to the bush axis 100 is executed. By the oblique execution of the cut 50 is achieved that the bypass flap 56 is substantially liquid-tight below a certain threshold pressure. When a certain fluid pressure is exceeded then opens the bypass valve 56 ,

In 3 are particularly good the circumferential seals 11 to recognize, with which the inside of the inner part and in particular the chamber areas 20 . 21 during insertion of the inner part 1 in the socket housing 10 be sealed.

In 4 is shown schematically a section through the hydraulic damping bearing housing, wherein the inner part 1 in a bearing bush 10 is introduced. The elastomeric support body 2 lies between the two chambers 20 . 21 , The chambers 20 . 21 be through the radially extending divider 5 which directly connects to the socket housing 10 adjacent, liquid-tightly separated from each other. Furthermore, channel elements 3 provided, the flow channel over 30 between the channel elements 3 and the socket housing 10 form. The overflow channel 30 connects the first chamber 20 with the second chamber 21 , By in the overflow 30 drawn arrows 22 is an example of the flow direction of a liquid between the two chambers 20 . 21 indicated. For example, the liquid flows from the first chamber 20 in the overflow channel 30 in the second chamber 21 , The liquid always flows at the divider 5 past.

In 5 is now the same cross section as in 4 shown, but at high amplitudes. If a high amplitude occurs, the pressure in the chamber increases, for example 20 Very fast very strong. The fluid pressure on the in the divider 5 provided bypass flap 56 is then so high that the bypass flap 56 opens. The divider 5 deformed so at least in a partial area so that a seal between the divider 5 and the socket housing 10 no longer exists, but a hypo-channel 55 between the first chamber 20 and the second chamber 21 is released. With the arrow 23 schematically is the flow of liquid from the chamber 20 in the chamber 21 through the bypass channel 55 shown. A liquid exchange through the overflow channel 30 occurs when high pressures occur only to a small extent, since the friction in the overflow 30 is much higher than in the bypass channel 55 ,

By in the 4 and 5 Example described functionality of the hydraulic damping bushing is once again the great simplification disclosed by attaching a bypass valve 56 by a simple cut in the radially extending divider 5 given is.

1

inner part

10

socket housing

11

seals

12

bearing core

13

Supporting skeleton / intermediate sleeve

100

bushing axis

2

elastomeric supporting body

20

first chamber region

20 '

first chamber

21

second chamber region

21 '

second chamber

22

liquid flow with closed bypass channel

23

liquid flow when open bypass channel

3

channel elements

30

overflow

5

divider

50

cut in the divider

51

part of the divider

52

part of the divider

55

bypass channel

56

bypass damper

Claims (9)

Hydraulically damping bearing bush with egg inside part ( 1 ) housed in a socket housing ( 10 ) is insertable, wherein the inner part ( 1 ) an elastomeric support body ( 2 ) for supporting a bearing core ( 12 ) and the elastomeric support body ( 2 ) a filled with a hydraulic fluid first chamber area ( 20 ) and one with this via an overflow channel ( 30 ) second chamber area ( 21 ) and wherein a substantially radially extending elastic separating web ( 5 ) for substantially liquid-tight separation of the first chamber region ( 20 ) from the second chamber area ( 21 ), characterized in that the separating web ( 5 ) for producing a bypass flap ( 56 ), which is a direct connection of the first chamber area ( 20 ) with the second chamber area ( 21 ) bypassing the overflow channel ( 30 ) unlocks or locks at least one section ( 50 ), which relative to the separating web ( 5 ) is carried out obliquely, and that the separating web ( 5 ) through this section ( 50 ) into at least two parts ( 51 . 52 ) is subdivided, so that when loading the separating web ( 5 ) with a liquid and when a predetermined liquid pressure of at least one of the parts ( 51 . 52 ) of the separating web ( 5 ) evades the fluid and a bypass channel ( 55 ) between the first chamber area ( 20 ) and the second chamber area ( 21 ) releases. Hydraulically damping bushing according to claim 1, characterized in that the cut ( 50 ) relative to the separating web ( 5 ) is performed at an angle of 20 to 70 degrees. Hydraulically damping bushing according to one of the preceding claims, characterized in that the cut ( 50 ) relative to the bush axis ( 100 ) is carried out at an angle of 20 ° to 70 °. Hydraulically damping bushing according to one of the preceding claims, characterized in that the separating web ( 5 ) is acted upon by liquid from both sides. Hydraulically damping bushing according to one of the preceding claims, characterized in that the separating web ( 5 ) with a female housing ( 10 ) substantially liquid-tight. Hydraulically damping bushing according to one of the preceding claims, characterized in that the first chamber region ( 20 ) and / or the second chamber area ( 21 ) together with a female housing ( 10 ) each have a first chamber ( 20 ' ) and / or a second chamber ( 21 ' ) trains. Hydraulically damping bushing according to one of the preceding claims, characterized in that the overflow channel ( 30 ) substantially between channel elements ( 3 ) and a female housing ( 10 ) is trained. Hydraulically damping bushing according to one of the preceding claims, characterized in that when the bypass flap is open ( 56 ) released bypass channel ( 55 ) of a female housing ( 10 ) is limited. Hydraulically damping bushing according to one of the preceding claims, characterized in that the separating web ( 5 ) in a through the bush axis ( 100 ) extending level is located.