DE10351069A1 - Hydraulically damping sleeve comprises a stop shaped as a sphere, with at least a part of a pocket for it constituted as an anchoring zone - Google Patents

Abstract

The hydraulically damping sleeve, incorporating a core (1) and an outer sleeve (4) joined to one another by an elastomer element (2) forming liquid-filled chambers (3), comprises a stop (7) shaped as a sphere, with at least a part of the pocket (6) constituted as an anchoring zone for it. The pocket incorporates at least one liquid supply channel (8) for wetting the sphere surface.

Description

• – einen Kern und eine Außenhülse aus Metall oder Kunststoff;
• – ein Polster aus elastomerem Werkstoff, das zwischen dem Kern und der Außenhülse angeordnet ist, und zwar unter Ausbildung von mit Flüssigkeit gefüllten Kammern, die über mindestens einen Kanal miteinander verbunden sind; sowie
• – einen Anschlag aus unelastischem und stoßunempfindlichem Werkstoff, der in wenigstens einer der Kammern angeordnet ist, wobei der Anschlag einen Verankerungsbereich mit Sitz in einer Polstertasche und einen überstehenden Anschlagbereich mit Stoßkontakt zur Außenhülse aufweist, wobei der Verankerungsbereich des Anschlages mit den Kammern in Verbindung steht, so dass gleichzeitig eine Flüssigkeitsbenetzung des Anschlages innerhalb des Verankerungsbereiches erfolgt.

The invention relates to a hydraulically damping bush, comprising:

• - A core and an outer sleeve made of metal or plastic;
• - A pad of elastomeric material, which is arranged between the core and the outer sleeve, to form liquid-filled chambers, which are connected to each other via at least one channel; such as
• An abutment of inelastic and shock-resistant material disposed in at least one of the chambers, the abutment having an anchoring area seated in a cushion pocket and a protruding abutment area in abutting contact with the outer sleeve, the anchorage area of the abutment communicating with the chambers; so that at the same time a liquid wetting of the stop takes place within the anchoring area.

A generic bush, also called hydraulic bush, is particularly in the publications DE 196 26 535 A1 . DE 198 45 979 A1 and DE 199 60 484 A1 described. Such a hydraulic jack usually consists of two chambers (working chambers), which are connected to each other via at least one channel. In this regard, there are a variety of channel variants, in addition to the above-mentioned patent literature in addition, for example, the DE 100 35 024 A1 is called.

For the purpose of Limitation of the radial deflection of the core is in at least one the chambers, in particular in both chambers, a stop provided the next in more detail is presented.

According to DE 196 26 535 A1 the stop within its stop area consists of a frusto-conical body with rotationally symmetrical extension as anchoring foot. The projecting stop area with impact contact to the outer sleeve, however, is dome-shaped. Between the stop and the elastomer pad there is a defined fluid-filled cavity connected by two thin channels to the working chamber of the hydraulic sleeve. The stop closes almost completely under load. The liquid can only flow through the channels into the working chamber. This leads to a characteristic dynamic identifier of this hydraulic damping bushing.

In the DE 198 45 979 A1 is presented a hydraulic bushing, which is formed of two consecutively connected bearings, in conjunction with an outer and inner stop. The outer stop corresponds essentially to the stop concept according to DE 196 26 535 A1 , The inner stop is an elastomeric bump.

The DE 199 60 484 A1 describes a hydraulic bushing, in which a stop is provided, which consists of a filled with damping means recess, a displaceable under displacement of damping means axially within the recess stop body and a sealing membrane formed between the stop body and recess compensation elastic membrane.

in the As part of a further development, the object of the invention is now in it to create an improved stop, the static and dynamic forces absorbs the hydraulic bushing and eccentric, odd bumps of the Bearing core against the outer sleeve as possible low contact friction is subject and thus the wear of the stop is minimized.

Is solved this task according to characteristics of claim 1, characterized in that the stopper formed as a ball is, wherein the padded bag at least in its upper and / or lateral area a ball-like surface for the anchoring area having the ball, wherein within the cushion bag at least a supply channel for the liquid wetting the ball is present from the edge of the bag toward the pocket low point runs, so that the ball on the one hand safely seated, but on the other hand has rotating sliding paths that cover the entire sphere surface can.

The Minimizing the contact friction between the ball and the elastomer with constant liquid wetting causes the ball in a collision against the outer sleeve easily rotates and thus the abrasion of the stop at the contact zone to Outer sleeve reduced becomes. The padded pocket ensures that the ball is in operation not be pushed out of position.

Advantageous embodiments The invention are mentioned in the claims 2 to 20.

The Invention will now be described by way of embodiments with reference explained on schematic drawings. Show it:

1 a longitudinal section through the hydraulic bush of the stop variant I;

2 the detailed view X for the stop variant I according to 1 ;

3 the detailed view X for the stop variant II;

4 the detailed view X for the stop variant III;

5 the detail view X for the stop variant IV;

6 the detailed view X for the stop variant V.

1 shows a hydraulic bushing comprising a core 1 , an outer sleeve 4 and a cushion 2 made of elastomeric material, which is arranged between the core and outer sleeve. The core and the outer sleeve are usually made of metal, especially steel or aluminum. Corresponding plastics (eg Vestoran ^® Huls) are used. The pad is in particular a vulcanized rubber mixture based on natural or a synthetic rubber. The upholstery is vulcanised onto the core and also fixed to the window sleeve 5 connected. The two fluid-filled chambers 3 , which are connected to each other via at least one channel, are from the upholstery 2 on the one hand and the outer sleeve 4 on the other hand surrounded.

In both chambers 3 is a stop 7 arranged in the form of variant I, now this variant in conjunction with the 2 is presented in more detail.

To 2 is the stop 7 formed as a ball with a constant diameter. The ball has an anchoring area A with its seat in the upholstery bag 6 that on the core 1 is vulcanized, and a protruding stopper area B with impact contact to the outer sleeve 4 on. The entire cushion pocket has a flared pocket edge C on a spherical surface for the anchoring area A, which preferably covers at least 75% of the ball volume.

Inside the upholstery bag 6 is at least one supply channel 8th present, which runs from the pocket edge C to the pocket low point D and takes the shortest path. The Vorsorgungskanal is formed as a groove which extends within the surface of the cushion bag. Advantageously, two to four supply channels are present, which run in the circumferential direction of the cushion pocket at the same distance from each other. All supply channels go here within the pocket low point D in a common coverage area. In this way, an optimal liquid wetting of the ball.

In the outer region of the pocket edge C, which is widened at this point, is a circumferential fastening means 9 present in the form of a tension spring. This tension spring securely positions the ball without disconnecting the supply channel and without restricting the rotating slide paths.

3 shows a stop variant II, the padded bag 6 in the area of the pocket low D a survey 10 with round support surface for the ball 7 has. Between pad pocket and the ball forms a pocket chamber in the unloaded state 11 , which in turn advantageously by two to four uniformly distributed over the circumference supply channels 8th with liquid from the working chamber 3 is supplied. This pocket chamber forms within the region of the pocket low D a common coverage area.

4 shows a stop variant III, the padded bag 6 in the area of the pocket low point D a flat surface 12 as bearing surface for the ball 7 has, in particular in the form of a circular area. Between the upholstery bag and the ball, a pocket chamber is formed in the unloaded state 13 also advantageously by two to four evenly distributed over the circumference supply channels 8th with liquid from the working chamber 3 is supplied.

5 shows a stop variant IV. In the area of the pocket low point D is an annular groove 14 present in the upholstery bag 6 is admitted. This annular groove is in turn advantageously over two to four evenly distributed over the circumference supply channels 8th connected to the working chamber and is thus supplied with liquid.

6 shows finally a stop variant V. In the area of the pocket low point D is a wave-shaped system 15 available here as a support surface for the ball 7 serves. This creates several pocket chambers in the unloaded state 16 , which in turn advantageously by two to four uniformly distributed over the circumference supply channels 8th with liquid from the working chamber 3 be supplied.

Also in the embodiments according to 3 to 6 is the respective padded bag 6 to the core 1 vulcanized. If necessary, the ball can also be used here 7 by a tension spring 9 ( 1 . 2 ) are securely positioned.

• – Die Kugel besteht aus Kunststoff, insbesondere einem thermoplastischen Kunststoff oder einem thermoplastischen Elastomer.
• – Es finden thermoplastische Kunststoffe auf Basis von Polyphenylenether, Polyamiden, Polyalkylenterephthalaten, Polyacetalharze oder Polyimiden Verwendung.
• - Der Kunststoff ist glasfaserverstärkt, insbesondere bei Verwendung von Polyamiden.

Regardless of the embodiments according to 1 to 6 applies to the ball 7 expediently the following material constellation:

• - The ball is made of plastic, in particular a thermoplastic or a thermoplastic elastomer.
• Thermoplastics based on polyphenylene ethers, polyamides, polyalkylene terephthalates, polyacetal resins or polyimides are used.
• - The plastic is glass fiber reinforced, especially when using polyamides.

• – Der Anschlag in Form der Kugel 7 nimmt die statischen und dynamischen Kräfte der Hydrobuchse auf und begrenzt den relativen Weg vom Kern 1 zur Außenhülse 4.
• – Bei einem guten Fahrkomfort werden weiche Kraft-Weg-Kennungen mit stetigem Verlauf erwünscht. Durch die Wahl der Dimension und des Werkstoffes der Kugel sowie die Geometrie der Polstertasche 6, insbesondere im Bereich des Taschentiefpunktes D, kann die gewünschte Kennung der Anschläge realisiert werden.
• – Mit den in den 1, 2, 5 und 6 dargestellten Anschlagvarianten I, IV und V lassen sich wegen geringer Elastomerstärke im Bereich des Taschentiefpunktes D eine steifere Kraft-Weg-Kennung realisieren. Die Kennung ist über den gesamten Arbeitsbereich stetig und stark progressiv. Der Arbeitsbereich des Anschlages ist relativ klein.
• – Mit den in den 3 und 4 dargestellten Anschlagvarianten II und III lassen sich wegen der größeren Elastomerstärke im Bereich des Taschentiefpunktes D eine relativ weiche Kraft-Weg-Kennung realisieren. Die Kennung ist im Anfangsbereich durch die Überhöhung der Polstertasche 6 im Bereich des Taschentiefpunktes leicht progressiv, steigt bei weiterer Ausleitung stark an. Die Kennung ist über den gesamten Bereich stetig. Der Arbeitsbereich des Anschlages ist größer.
• – Die Kraft-Weg-Kennung kann zudem über die Dimensionierung (Tiefe, Breite) des Versorgungskanals 8 beeinflusst werden.

Finally, in connection with the embodiments according to 1 to 6 the following:

• - The stop in the form of the ball 7 absorbs the static and dynamic forces of the hydraulic bush and limits the relative distance from the core 1 to the outer sleeve 4 ,
• - With a good ride comfort soft force-displacement identifiers are desired with a steady course. By choosing the dimension and material of the ball and the geometry of the cushion bag 6 , In particular in the area of the pocket low point D, the desired identifier of the attacks can be realized.
• - With the in the 1 . 2 . 5 and 6 shown stop variants I, IV and V can be realized because of low Elastomerstärke in the range of Taschentiefpunktes D a stiffer force-distance identifier. The identifier is steady and highly progressive over the entire workspace. The working area of the stop is relatively small.
• - With the in the 3 and 4 shown stop variants II and III can be realized because of the greater elastomer thickness in the region of the pocket low point D, a relatively soft force-displacement identifier. The identifier is slightly progressive in the initial area due to the elevation of the pad pocket 6 in the region of the pocket low point, rises sharply on further diversion. The identifier is continuous over the entire range. The working area of the stop is larger.
• - The force-displacement identifier can also on the dimensioning (depth, width) of the supply channel 8th to be influenced.

1

core (Bearing core)

2

pad (Suspension spring) made of elastomeric material

3

chamber (Working chamber)

4

Outer sleeve (socket)

5

window sleeve

6

padded envelope (Elastomer bag)

7

attack (Sphere) in the variants I to V

8th

supply channel

9

fastener (Tension)

10

survey

11

bag chamber

12

level area (Circular surface)

13

bag chamber

14

ring groove

15

wavy system

16

bag chamber (Multi-chamber system)

A

anchoring area the ball

B

stop area the ball

C

pocket edge

D

Bag nadir

Claims (20)

A hydraulic damping bush comprising: - a core ( 1 ) and an outer sleeve ( 4 ) made of metal or plastic; - a cushion ( 2 ) made of elastomeric material which is between the core ( 1 ) and the outer sleeve ( 4 ), with the formation of fluid-filled chambers ( 3 ), which are connected to each other via at least one channel; and - a stop ( 7 , I to V) of inelastic and shock-insensitive material, which in at least one of the chambers ( 3 ), wherein the stop has an anchoring area (A) with a seat in a padded pocket (A). 6 ) and a projecting stop area (B) with impact contact to the outer sleeve ( 4 ), wherein the anchoring region of the stop is in communication with the chambers, so that at the same time a liquid wetting of the stop takes place within the anchoring region; characterized in that - the stop ( 7 , I to V) is formed as a ball, wherein the padded bag ( 6 ) has a ball-corresponding surface for the anchoring area (A) of the ball at least in its upper and / or lateral area, wherein at least one supply channel (within the cushion pocket) 8th ) is present for the liquid wetting of the ball, which extends from the pocket edge (C) in the direction Taschentiefpunkt (D), so that the ball on the one hand securely seated, on the other hand, however, has rotating slide paths, which can detect the entire spherical surface. Bush according to claim 1, characterized in that the stop ( 7 , I to V) consists of plastic. Bush according to claim 2, characterized in that the stop ( 7 , I to V) consists of a thermoplastic material. Bush according to claim 3, characterized in that the stop ( 7 , I to V) is a thermoplastic based on polyphenylene ether, polyamides, polyalkylene terephthalates, polyacetal resins or polyimides. Socket according to one of claims 2 to 4, characterized in that the plastic is glass fiber reinforced, in particular when using poly amides. Bush according to claim 2, characterized in that the stop ( 7 , I to V) consists of a thermoplastic elastomer. Bushing according to one of claims 1 to 6, characterized that the ball has a constant diameter. Bushing according to one of claims 1 to 7, characterized in that substantially the entire cushion bag ( 6 ) has a ball-like surface for the anchoring area (A) of the ball. Bush according to one of claims 1 to 7, characterized in that the padded bag ( 6 ) in the area of the pocket low point (D) a survey ( 10 ), a flat surface ( 12 ) or a wavy system ( 15 ) has as support surface for the ball, wherein in the unloaded state, at least one pocket chamber ( 11 . 13 . 16 ) connected to the supply channel ( 8th ). Socket according to one of claims 1 to 9, characterized in that the supply channel ( 8th ) is formed for the liquid wetting of the ball as a groove, which within the surface of the cushion bag ( 6 ) runs. Socket according to one of claims 1 to 10, characterized in that the supply channel ( 8th ) takes the shortest path in its course from the pocket edge (C) in the direction of the pocket low point (D). Socket according to one of claims 1 to 11, characterized in that a plurality of supply channels ( 8th ) available. Socket according to Claim 12, characterized in that two to four supply channels ( 8th ), in particular four supply channels, are present. Socket according to Claim 12 or 13 in conjunction with Claim 11, characterized in that the supply channels ( 8th ) in the circumferential direction of the cushion bag ( 6 ) run at the same distance from each other. Socket according to one of claims 1 to 14, characterized in that the supply channel ( 8th ) runs in such a way that with multiple supply channels in the region of the pocket low point (D), a common supply area is created. Socket according to one of claims 1 to 15, characterized in that the supply channel ( 8th ) in an annular groove ( 14 ), which is in the area of the pocket low point (D). Bushing according to one of claims 1 to 16, characterized the anchoring area (A) of the stop is at least 50%, in particular at least 75% of the ball volume detected. Socket according to one of claims 1 to 17, characterized in that in the outer region of the pocket edge (C) a circumferential fastening means ( 9 ), which safely positions the ball without the supply channel ( 8th ) and without restricting the rolling glides of the spherical surface. Bushing according to claim 18, characterized in that the fastening means ( 9 ) is a tension spring. Bushing according to claim 18 or 19, characterized in that the pocket edge (C) in the region of the fastening means ( 9 ) is widened, in particular while maintaining a spherical surface.