DE102017108477B3 - Frictional torque optimized double row suspension strut bearing - Google Patents

Abstract

The invention relates to a strut bearing (1) with a cap (2), a guide ring (3), and a bearing device (4) which is arranged between the cap (2) and the guide ring (3), whereby the cap (2 ) and the guide ring (3) are rotatably mounted relative to each other about an axis (D). The bearing device (4) comprises two bearings (4A, 4B), wherein at least one of the bearings (4A, 4B) comprises two bearing elements, in particular a bearing inner element (5A, 5B) and a bearing outer element (6A, 6B), wherein the strut bearing ( 1) comprises a switching device (8) for the bearing device (4), and wherein the switching device (8) is formed in a first state of the suspension strut bearing (1) a power transmission from the cap (2) to the guide ring (3) via one of the two bearings (4B) of the storage device (4) to prevent.

Description

The invention relates to a suspension strut bearing with a cap, a guide ring and with a bearing device which is arranged between the cap and the guide ring, whereby the cap and the guide ring are rotatably mounted relative to each other about an axis.

From the prior art single row strut bearing with a height greater than 11 mm are known. This limit of the height is determined by the Wälzkörperdurchmesser z. B. a ball bearing or a bearing device of the suspension strut bearing, by the bearing inner and outer bearing element (eg., Inner and outer ring) of the bearing device and by the support geometry in guide ring and cap by design.

In conventional suspension strut bearings, due to the uneven introduction of spring forces, torsions or displacements of the bearing elements of the bearing device or roller bearing occur.

In general, one end of a spring pushes only at two to three points to max. 270 ° contact with the suspension strut bearing and depending on the direction and magnitude of the lateral force of the spring, this deforms. Along with this, the bearing device or roller bearing also deforms.

With height-reduced or stiffness-reduced bearings occurs above-mentioned facts even more pronounced and can lead to premature failure of a suspension strut bearing.

In short, conventional strut bearings are under load or under the influence of high shear forces or under an unfavorable spring force distribution axially and radially deformed so much or moved to each other that touch the cap and the guide ring of the strut bearing and even damage each other.

Furthermore, due to partial overload fractures of the cap and guide ring are possible.

The consequence of this is that a damaged suspension strut bearing can cause high friction moments and even noises.

It is therefore an object of the present invention to provide a suspension strut bearing for a vehicle, in particular an automobile, which has a high degree of robustness or mechanical stability and which is easy to produce and has a low degree of friction.

This object is achieved by the features of the independent claim. Further advantageous developments are the subject of the dependent claims.

According to the invention, the present invention comprises a suspension strut bearing for a vehicle, in particular an automobile.

The strut bearing preferably has a cap, a guide ring and a bearing device which is arranged between the cap and the guide ring, whereby the cap and the guide ring are rotatably supported relative to each other about an axis or about a rotation axis.

Preferably, the axis or axis of rotation is oriented in the axial direction, while advantageously a radial direction is oriented perpendicular to the axial direction. Preferably, the radial and / or axial direction relate to the bearing device or their bearings.

Conveniently, the bearing device comprises two bearings, wherein preferably at least one of the bearings has two bearing elements, in particular a bearing inner element and a bearing outer element. Preferably, the bearing inner element is designed as an inner ring and the bearing outer element as an outer ring.

Furthermore, it is preferred that the suspension strut bearing comprises a switching device for the bearing device.

Preferably, the switching device is designed to prevent a power transmission from the cap to the guide ring via one of the two bearings of the bearing device in a first state of the suspension strut bearing. In this way, friction moments of the bearing device or friction moments of one or the bearings can be reduced. Also caused by this less caused by the bearing device noise. Further, it is thereby possible to increase the life of the bearing device and the suspension strut bearing.

Furthermore, it is advantageous if the switching device is designed to ensure a transmission of power from the cap to the guide ring via the two bearings of the bearing device in a second state of the suspension strut bearing. Thus, it is thus possible to transmit by means of a switching device in case of need forces acting on two bearings of the bearing device. In this way, therefore, acting forces can be transmitted via two bearings of the bearing device, whereby the acting forces can be better distributed and therefore within the suspension strut bearing an improved power flow can be ensured.

Preferably, in the first state forces acting on the strut bearing in the radial and / or axial direction, in particular based on the bearing means, below a determinable threshold, so conveniently only one bearing for power transmission from the cap to the guide ring can be activated.

The determinable threshold value are preferably values which range from z. B. approximately 4000 - 5000 N axial and 800 - 1000 N radially. In the case of the stated values, preferably the suspension strut bearing is displaced or deformed, as a rule, neither in the radial nor in the axial direction.

Additionally or alternatively (and / or) are preferably in the second state forces acting on the suspension strut bearing in the radial and / or axial direction, in particular with respect to the bearing device, above a determinable threshold. As a result, both bearings can be activated to transmit power from the cap to the guide ring.

The determinable threshold is preferably values that range from z. B. about 5000 - 7000 N axial and about 1500 N radially. At said values, preferably the strut bearing is displaced / deformed in the radial / axial direction as a rule.

According to the invention, the cap comprises a bearing surface for bearing a bearing element, in particular a bearing inner element or a bearing outer element. A bearing surface is preferably designed such that a bearing inner element or a bearing outer element of a bearing of a bearing device can be accommodated, as a result of which acting forces can be transmitted or transmitted in the best possible manner.

It is also advantageous according to the invention, if in a contact surface for a second bearing element, the bearing surface is arranged. Conveniently, the bearing surface jumps back in the axial direction compared to the contact surface in order preferably to increase the distance between the contact surface of the cap and the guide ring in the axial direction.

In other words, therefore, a bearing surface is arranged within a contact surface, wherein preferably the bearing surface has an enlarged distance to the axis of rotation of a bearing element or a bearing device compared to the contact surface. Again, in other words, forms the bearing surface within a contact surface a stop against which a bearing element, in particular a bearing outer element, a bearing is applied, for example, if radial and / or axial forces exceed a detectable threshold.

Furthermore, it can be provided that the switching device comprises at least one spring element. Preferably, the at least one spring element positions a bearing, in particular a bearing element, between the cap and the guide ring, preferably without play, in the axial and / or radial direction.

By means of the at least one spring element, it is possible, a bearing device or a bearing between a first state in which a power transmission from the cap to the guide ring can be prevented, in a second state in which a power transmission from the cap to the guide ring can be ensured turn. Of course, it is also possible to switch from the second state to the first state by means of the at least one bearing element of the switching device.

Preferably, the at least one spring element contacted at at least two positions which are distributed in the circumferential direction of the suspension strut bearing, preferably evenly distributed, a bearing element. In this way, therefore, a spring force of the at least one spring element is transmitted to a bearing element at two positions or at two locations in order to switch it preferably in the first or second state.

It is also advantageous if the switching device comprises an elastic, in particular rubber-elastic, material. This material can be processed in a simple manner, for example, in a multi-component injection molding process.

Preferably, the cap comprises a plastic. Plastic can also be processed, for example, in a multi-component injection molding process.

Furthermore, it is advantageous if the switching device and the cap are integrally formed, in particular produced simultaneously, preferably by means of a multi-component injection molding process. In this way, manufacturing costs can be reduced and the production can be simplified.

Preferably, the switching device comprises a sealing device. With the help of a sealing device, it is possible to perform sealing tasks in a suspension strut bearing.

Preferably, the sealing device comprises at least one sealing lip, which preferably rests against the guide ring. Consequently, a bearing device of the suspension strut bearing can preferably be sealed with the at least one sealing lip.

Conveniently, the sealing device and the at least one spring element are connected to each other, in particular formed in one piece. Thus, manufacturing costs can be reduced and the production can be simplified.

Furthermore, it is favorable if two raceways of the bearings of the bearing device have different distances in the radial direction to the axis of rotation. The raceways are preferably raceways of the bearing inner or outer bearing elements.

In other words, it is favorable if preferably the planes of rotation in which the bearings rotate are congruent. In other words, preferably two bearings of the bearing device have different radii, wherein the bearing outer element of a bearing has a smaller radius than the bearing element of another bearing. In this way, two bearing inner elements and two bearing outer elements can be arranged with different radial distance from the axis or axis of rotation, wherein the bearing inner and outer bearing elements, however, are not spaced apart in the axial direction.

It is also preferred if at least one of the two bearings comprises rolling elements, wherein preferably the rolling elements 7 have a diameter of less than 5 millimeters. Preferably, the rolling elements have a diameter in the range of 5 to 1 millimeter, preferably in the range of 4.9 to 3 millimeters. In this way, a suspension strut bearing with a height below 11 millimeters, preferably between 9 and 11 millimeters, feasible.

Furthermore, it is advantageous if the bearing device has a multi-row rolling bearing.

Additionally or alternatively (and / or) it is favorable if the bearing device comprises at least two single-row roller bearings. Advantageously, the at least two single-row roller bearings are arranged in a tandem arrangement or an O arrangement or an X arrangement.

Additionally or alternatively (and / or) it is advantageous if the bearing device comprises a multi-row and a single-row roller bearing.

Additionally or alternatively (and / or), it is possible for the bearing device to be designed as an axial angular contact ball bearing, in particular as a double row axial angular contact ball bearing or as a two single row axial angular contact ball bearing for receiving axial and radial forces.

Hereinafter, the inventive idea presented above is expressed in other words in addition.

This idea preferably relates - in simplified terms - to a suspension strut bearing whose bearing is favorably more robust against axial and radial deformation / displacement and against disc fractures.

Furthermore, the Lagerreibmoment should conveniently not be increased or lower in the maximum load range than conventional bearings.

The greater robustness or bearing capacity of the bearing is preferably achieved by a second axial ball row or by another bearing.

Due to the significantly higher number of ball contacts in two camps Reibmomentanstieg is favorably prevented by a ball row or one of the two bearings is designed switchable.

In other words, it is advantageous if at normal spring load (eg, about 4000 - 5000 N axial and 800 - 1000 N radial) only one row of balls or only one bearing is in force engagement or if only one bearing of a Storage device ensures a power transmission.

The second ball row or a second bearing of a bearing device is preferably held backlash-free in its position by at least one spring element with relatively little force.

With increasing axial and radial spring forces (eg approximately 5000-7000 N axial and approximately 1500 N radial), preferably the suspension strut bearing is displaced / deformed in the radial / axial direction as a rule.

Because of this displacement or deformation, the second ball row or the second bearing is favorably moved in the same way. In this way, the at least one spring element is deformed, so that after a certain deformation of the suspension strut bearing the second row of balls or the second bearing is pressed against solid plastic of the cap and it comes preferably to adhesion, so that the first row of balls or supports the first camp becomes.

The resulting Rollreibmoment is conveniently lower than the friction torque, which is caused by the contact of the cap and guide ring.

Due to the additional balls of the second row or second bearing, the load rating is preferably partially increased, whereby disk fractures can be avoided.

• 1 eine Schnittansicht auf ein erfindungsgemäßes Federbeinlager in einem ersten Zustand.

The invention will be explained in more detail with reference to an embodiment in conjunction with an accompanying drawing. This shows schematically:

• 1 a sectional view of an inventive strut bearing in a first state.

1 shows a sectional view of a strut bearing according to the invention 1 for a vehicle, in particular an automobile, in a first state.

Shown in more detail 1 a suspension strut bearing 1 with a cap 2 , a guide ring 3 and a storage device 4 ,

The storage device 4 is between the cap 2 and the guide ring 3 is arranged, whereby the cap 2 and the guide ring 3 relative to each other about a rotation axis D are rotatably mounted.

Here is the axis or axis of rotation D in the axial direction A oriented while a radial direction R perpendicular to the axial direction A is oriented.

In this case, the storage device comprises 4 two camps 4A . 4B , each bearing 4A . 4B a bearing inner element 5A . 5B and a bearing outer member 6A . 6B having.

Further shows 1 that the strut bearing 1 a switching device 8th for the storage device 4 includes.

The switching device 8th is formed in a first state of the suspension strut bearing 1 , as in 1 shown a power transmission from the cap 2 to the leadership ring 3 over the camp 4B the storage device 4 to prevent.

The switching device 8th or the suspension strut bearing 1 are then in the first state when acting forces on the suspension strut bearing 1 in radial R and axial direction A lie below a determinable threshold. Consequently, below the determinable threshold, only the bearing 4A for power transmission of the cap 2 to the leadership ring 3 activated.

The abovementioned determinable threshold value or values which are in the range of z. B. approximately 4000 - 5000 N axial and 800 - 1000 N radially. At these values, the strut bearing 1 usually neither in radial R nor in the axial direction A shifted or deformed.

Furthermore, the switching device 8th formed in a second state (not in 1 shown) of the suspension strut bearing 1 a power transmission from the cap 2 to the leadership ring 3 over the two camps 4A . 4B the storage device 4 to ensure.

Here are the switching device 8th or the suspension strut bearing 1 then in the second state, when acting forces on the suspension strut bearing 1 in radial R and axial direction A are above a determinable threshold. As a result, therefore, both bearings are above the determinable threshold value 4A . 4B for power transmission of the cap 2 to the leadership ring 3 enableable.

The determinable threshold is values or forces that are in the range of z. B. about 5000 - 7000 N axial and about 1500 N radially. At named forces is the strut bearing 1 usually in radial R and axial direction A shifted or deformed.

Further shows 1 that the cap 2 a storage area L for conditioning the bearing outer element 6B includes, being in a contact surface M for the further bearing element 5A the storage area L is arranged.

The storage area L jumps in comparison to the contact surface M in the axial direction A back to in the axial direction A the distance X between the contact surface M the cap 2 and the guide ring 3 to enlarge.

This forms the storage area L within a contact area M a stop against which the bearing outer element 6B of the camp 4A abuts when forces in radial R and axial direction A exceed a determinable threshold.

For realizing the first and second states comprises according to 1 the switching device 8th a spring element 9 that the camp 4B or its outer bearing element 6B between the cap 2 and the guide ring 3 free of play in axial A and radial direction R positioned.

While it is not in 1 to recognize, however, contact various spring elements 9 at several positions, in the circumferential direction U the suspension strut bearing 1 are evenly distributed, the bearing element 6B or the outer bearing element 6B , In this way are the various spring elements 9 capable of bearing outer element 6B evenly in the axial direction A respectively.

Here is the switching device 8th made of a rubber-elastic material and the cap 2 made of a plastic.

Also, the switching device 8th and the cap 2 integrally formed, in particular produced simultaneously, preferably by means of a multi-component injection molding process.

Further shows 1 in that the switching device 8th a sealing device 10 includes the two sealing lips 11 . 12 Has. The sealing lips 11 . 12 lie against the guide ring 3 at. This can be dirt entry to the camps 4A . 4B be prevented.

Also, the sealing device 10 and the spring element 9 or the spring elements formed in one piece.

In addition, goes out 1 that shows two careers 14 . 15 the storage 4A . 4B the storage device 4 different distances in the radial direction R to the axis of rotation D exhibit.

Here are the planes of rotation in which the bearings 4A . 4B turn, congruent.

Each of the two bearings 4A . 4B has rolling elements 7 which have a diameter of 4 millimeters.

At the camps 4A . 4B the storage device 4 These are two single-row roller bearings, which are each designed as axial angular contact ball bearings for receiving axial and radial forces.

Furthermore goes out 1 produced that cap 2 the suspension strut bearing 1 with a snap 2a is trained.

The snapping 2a engages in a complementary trained snap 3b of the guide ring 3 ,

Furthermore, the guide ring has 3 a spring receiver 3a which can receive a spring of a chassis part.

Also shows 1 that the bearings 4A . 4B one kä each 13A . 13B exhibit.

LIST OF REFERENCE NUMBERS

1

Strut mounts

2

cap

2a

snap fastening

3

guide ring

3a

spring mount

3b

snap fastening

4

bearing device

4A

camp

4B

camp

5A

Inner bearing element

5B

Inner bearing element

6A

Outer bearing element

6B

Outer bearing element

7

rolling elements

8th

switching device

9

spring element

10

sealing device

11

sealing lip

12

sealing lip

13A

Cage

13B

Cage

14

career

15

career

A

axial direction

R

radial direction

U

circumferentially

D

Rotation axis / axis

L

storage area

M

contact surface

X

distance

Claims (9)

Strut bearing (1) comprising: - a cap (2), - a guide ring (3), - a bearing device (4) which is arranged between the cap (2) and the guide ring (3), whereby the cap (2) and the guide ring (3) are mounted rotatably relative to each other about an axis (D), - wherein the bearing device (4) comprises two bearings (4A, 4B), - wherein at least one of the bearings (4A, 4B) two bearing elements, in particular a bearing inner element (5A, 5B) and a bearing outer element (6A, 6B), characterized in that - the strut bearing (1) comprises a switching device (8) for the bearing device (4), - wherein the switching device (8) is formed in a first state of the suspension strut bearing (1) a power transmission from the cap (2) to Guide ring (3) via one of the two bearings (4B) of the bearing device (4) to prevent - wherein the cap (2) has a bearing surface (L) for bearing a bearing element, in particular a bearing inner element (5A, 5B) or a bearing outer element (6A, 6B), - wherein preferably in a contact surface (M) for a second bearing element, the bearing surface (L) is arranged, which in comparison to the contact surface (M) in the axial direction (A) springs back to the axial direction (A) Distance (X) between the contact surface (M) of the cap (2) and the guide ring (3) to enlarge. Strut bearing after Claim 1 , - wherein the switching device (8) is adapted, in a second state of the suspension strut bearing (1) to ensure a power transmission from the cap (2) to the guide ring (3) via the two bearings (4A, 4B) of the bearing device (4). Strut bearing after Claim 1 or 2 , - In the first state acting forces on the suspension strut bearing (1) in the radial (R) and / or axial direction (A) are below a determinable threshold, so that only one bearing (4A) for transmitting power from the cap (2) to the guide ring (3) is activatable, and / or - preferably in the second state forces acting on the suspension strut bearing (1) in the radial (R) and / or axial direction (A) above a determinable threshold, whereby both bearings (4A, 4B) for power transmission from the cap (2) to the guide ring (3) can be activated. Strut bearing according to one of the preceding claims, - wherein the switching device (8) comprises at least one spring element (9), the bearing (4B), in particular a bearing element, between the cap (2) and the guide ring (3), preferably without play, in the axial (A) and / or positioned in the radial direction (R), - Preferably wherein the at least one spring element (9) at at least two positions, which are distributed in the circumferential direction (U) of the suspension strut bearing (1), preferably uniformly distributed, contacted a bearing element. Strut bearing according to one of the preceding claims, - wherein the switching device (8) comprises an elastic, in particular rubber-elastic, material, - wherein the cap (2) comprises a plastic, - Wherein the switching device (8) and the cap (2) are integrally formed, using a multi-component injection molding process. Strut bearing according to one of the preceding claims, - wherein the switching device (8) comprises a sealing device (10), wherein preferably the sealing device (10) comprises at least one sealing lip (11, 12) which bears against the guide ring (3), - Wherein the sealing means (10) and the at least one spring element (9) are interconnected, in particular formed in one piece. Strut bearing according to one of the preceding claims, - wherein two raceways (14, 15) of the bearings (4A, 4B) of the bearing device (4) have different distances in the radial direction (R) to the axis of rotation (D), - Where the planes of rotation, in which rotate the bearings (4A, 4B), are congruent. Strut bearing according to one of the preceding claims, - wherein at least one of the two bearings (4A, 4B) comprises rolling elements (7), - The rolling elements (7) have a diameter in the range of 5 to 1 millimeters, preferably in the range of 4.9 to 3 millimeters. Strut bearing according to one of the preceding claims, - Wherein the bearing device (4) comprises a multi-row rolling bearing, and / or - Preferably wherein the bearing device (4) comprises at least two single-row bearings, and / or wherein preferably the bearing device (4) comprises a multi-row and a single-row roller bearing, and / or - Preferably wherein the bearing device (4) is designed as axial angular contact ball bearings, for receiving axial and radial forces.

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