DE102017100765A1 - Rolling bearing with a seal assembly and wheel bearings - Google Patents

Abstract

The invention relates to a rolling bearing (1) with a first bearing ring (2) and a second bearing ring (3), wherein between the first bearing ring (2) and the second bearing ring (3) a sealing arrangement (4) is formed which one with the a first support element (5) and a second support element (6) connected to the second bearing ring (3), wherein a sealing element (7) is formed on the first support element (5), and wherein between the sealing element ( 7) and at least one of the carrier elements (5, 6) or a sealing plate (8) a sealing channel (16) is formed, which has the shape of a siphon (14).

Description

The invention relates to a rolling bearing with a seal assembly and a wheel bearing with such a rolling bearing.

Rolling bearings are used in many different variants to support a rotating component, usually a shaft. In this case, the storage of components which are exposed to strong environmental influences is a challenge, since in these applications, penetration of dirt or liquid can lead to damage of the rolling bearing and subsequent failure. For these applications, for example for wheel bearings of a motor vehicle, correspondingly sealed rolling bearings are known in which one or more seals are provided between the bearing rings to prevent ingress of dirt and / or liquids in the region of the rolling bearing, in which the rolling elements are located.

From the DE 10 2013 212 073 A1 a wheel bearing is known in which a wheel of a motor vehicle can be fastened on a wheel carrier, which is mounted rotatably relative to the motor vehicle via a double row rolling bearing unit. In this case, a double row rolling bearing is arranged on a wheel hub of the wheel bearing, which has a cavity between the first row of rolling elements and the second row of rolling elements. Due to temperature fluctuations, for example, due to operational heating of the wheel bearing, negative pressure situations can arise in this cavity. This negative pressure can result in a sealed rolling bearing to a significant increase in the coefficient of friction on the seal and an associated additional consumption of the motor vehicle. In addition, due to the higher friction, the seals wear out faster, which can lead to water entering the rolling bearing and ultimately to failure of the rolling bearing.

The object of the invention is to reduce the frictional torque on a roller bearing and at the same time to improve the sealing performance on a roller bearing upstream sealing arrangement.

According to the invention this object is achieved by a rolling bearing with a first bearing ring and a second bearing ring, wherein between the first bearing ring and the second bearing ring, a seal arrangement is formed, which has a first bearing member connected to the first support member and a second bearing ring connected to the second support member wherein a sealing element is formed on the first carrier element, and wherein between the sealing element and at least one of the carrier elements or a sealing plate, a sealing channel is formed, which has the shape of a siphon. By a siphon in the sealing channel, a blocking element is formed, which significantly limits the penetration of dirt and water into the sealing channel of the seal assembly. In this case, the sealing effect can be additionally improved by a sealing projection on the rolling elements facing away from the end of the sealing channel, since this sealing projection leads to a thin sealing gap at the entrance of the sealing channel. By the siphon function entered into the sealing gap water can serve as a barrier filling of the siphon, whereby further penetration of water or dirt is prevented in the seal assembly. Alternatively, the siphon can be filled in advance, to form a corresponding blocking element from the beginning. In this case, a filling with a hydrophobic substance is particularly preferred in order to prevent a mixing of the stockpiled in the siphon hydrophobic substance with penetrating water and thus to increase the efficiency of the blocking effect.

By the features listed in the dependent claims improvements and developments of the rolling bearing specified in the independent claim are possible.

In a preferred embodiment of the invention, it is provided that the sealing element has a sealing lip which bears against a section of the second carrier element extending substantially perpendicular to the bearing rings. This can be realized in combination with the siphon a rolling bearing with only one sliding sealing lip with high sealing effect. With only one rubbing seal, the friction can be significantly reduced compared to rolling bearings with several sliding seals, thus reducing the heat buildup on the rolling bearing. As a result, the frictional torque behavior and the sealing performance of the rolling bearing can be further improved compared with known rolling bearings.

In a further preferred embodiment of the rolling bearing is provided that the siphon is filled with a water and / or dirt repellent grease deposit. A water-repellent and dirt-repellent grease deposit in the siphon can enhance the effect of the siphon as a barrier against ingress of dirt and water. In this case, a high-viscosity grease is preferably used to reduce the risk of leakage of the fat deposits in a dynamic operation of the bearing. A filled with a water-repellent grease siphon provides a very efficient barrier against penetrating from the outside into the seal assembly water, since the water bubbles on the surface of the grease and thus can not penetrate further into the seal assembly of the bearing.

According to the invention, a wheel bearing for a motor vehicle with a rolling bearing according to the invention is also proposed. Since the protection of the rolling bearing body against dirt and water is a central challenge, especially in wheel bearings, to ensure the durability of the wheel bearing, it is particularly advantageous to use a rolling bearing according to the invention in a wheel bearing of a motor vehicle. The siphon makes the penetration of water and contaminants, in particular of dirt, dust and hard particles more difficult, so that the durability of the bearing can be significantly increased. By only one sealing lip, which bears against the second carrier element, a high sealing effect can be achieved in combination with the siphon, so that it is possible to dispense with additional radial sealing lips. Instead of one or more radial sealing lips, a geometry is realized with a targeted conveying direction and introduced as the last barrier in front of the rolling body an additional grease deposit in the seal assembly of the bearing, which is hydrophobic and dirt repellent.

The various embodiments of the invention mentioned in this application are, unless otherwise stated in the individual case, advantageously combinable with each other.

• 1 ein Ausführungsbeispiel eines erfindungsgemäßen Wälzlagers mit einer Dichtungsanordnung; und
• 2 einen vergrößerten Bereich des Siphons einer erfindungsgemäßen Dichtungsanordnung für ein Wälzlager.

The invention will be explained below in embodiments with reference to the accompanying drawings. The same components or components with the same function are identified by the same reference numerals. Show it:

• 1 an embodiment of a rolling bearing according to the invention with a seal assembly; and
• 2 an enlarged portion of the siphon of a seal assembly according to the invention for a rolling bearing.

In 1 is an embodiment of a rolling bearing according to the invention 1 with one of the rolling elements of the rolling bearing 1 upstream seal assembly 4 shown. The rolling bearing 1 includes a first bearing ring 2 , preferably the outer ring of a rolling bearing 1 , and a second bearing ring 3 , preferably the inner ring of a roller bearing. Between the first bearing ring 2 and the second bearing ring 3 is the seal arrangement 4 formed, which a first support element 5 having, which with the first bearing ring 2 is connected and a second carrier element 6 , which with the second bearing ring 3 connected is. The first carrier element 5 carries a sealing element 7 , The sealing element 7 is preferably made of an elastomer and cohesively with the first carrier element 5 connected. The second carrier element 6 has a first section 17 which is essentially parallel to the bearing rings 2 . 3 runs and with the second bearing ring 3 in contact. The second carrier element 6 also has a second section 15 which is substantially perpendicular to the bearing rings 2 . 3 runs. Alternatively, the second carrier element 6 also an additional gasket sheet 8th have a simple attachment to the second bearing ring 3 to allow and / or the second section 15 the second carrier element 6 to stabilize. It is between the first carrier element 5 and the second support member 6 a sealing channel 16 designed in the manner of a labyrinth seal. A sealing lip 11 of the sealing element 7 lies on the second, perpendicular to the bearing rings 2 . 3 extending section 15 the second carrier element 6 at. The sealing element 7 has several collecting pockets 18 . 19 . 20 on, in which in the seal assembly 4 penetrated dirt or water is trapped. Here are the collecting bags 18 . 19 . 20 designed so that by the rotation and the centrifugal forces occurring in the seal assembly 4 penetrated dirt or water infiltrated back to the outside. In addition to the collecting bags 18 . 19 . 20 points the sealing channel 16 at least one section, which in the manner of a siphon 14 is trained. Here is the siphon 14 preferably in an end region of the sealing channel facing away from the rolling bodies 16 educated. The siphon is preferably with a water and dirt repellent grease depot 12 filled to prevent ingress of dirt or liquid into the seal assembly 4 to complicate. Alternatively, the siphon 14 also be empty at first, and fill with splash water during operation, which in the siphon 14 enclosed spray water in further operation serves as a barrier for dirt and further spray water.

At the end of the sealing channel facing away from the rolling elements 16 has the sealing element 7 a sealing projection 10 on, which between the second support element 6 and the sealing element 7 a sealing gap 9 formed. In this case, the sealing projection protrudes 10 in the radial direction as far as in the direction of the second bearing ring 3 that he together with the sealing element 7 and the gasket sheet 8th the siphon 14 formed. The sealing gap 9 is preferably S-shaped designed to leak the fat deposits 12 to prevent. With a siphon 14 without grease depot should enter the sealing channel when dirty water enters 16 the siphon 14 Calm down the penetrating spray water and in the end region of the sealing channel facing away from the rolling elements 16 take up. This creates an additional barrier to further entry of dirty water into the seal assembly 4 to prevent.

The sealing channel 16 is at its end facing the rolling elements with another fat depot 13 filled, which serves as the last barrier in front of the rolling elements for penetrating dirt and / or penetrating water. At the same time, the fat depot 13 as storage depot for the lubrication of the rolling elements or a cage of the rolling bearing 1 serve.

LIST OF REFERENCE NUMBERS

1

roller bearing

2

first bearing ring

3

second bearing ring

4

sealing arrangement

5

first carrier element

6

second carrier element

7

sealing element

8th

sealing sheet

9

sealing gap

10

sealing projection

11

sealing lip

12

fat depot

13

fat depot

14

siphon

15

second part

16

sealing channel

17

first section

18

collecting pocket

19

collecting pocket

20

collecting pocket

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102013212073 A1 [0003]

Claims (4)

Rolling bearing (1) with a first bearing ring (2) and a second bearing ring (3), wherein between the first bearing ring (2) and the second bearing ring (3) a sealing arrangement (4) is formed, which is connected to the first bearing ring (2 1) and a second carrier element (6) connected to the second bearing ring (3), wherein a sealing element (7) is formed on the first carrier element (5), characterized in that between the sealing element (7) and at least one of the support elements (5, 6) or a sealing plate (8) a sealing channel (16) is formed, which identifies the shape of a siphon (14). Rolling bearing (1) according to Claim 1 , characterized in that the sealing element (7) has a sealing lip (11), which abuts against a substantially perpendicular to the bearing rings (2, 3) extending portion (15) of the second carrier element (6). Rolling bearing (1) according to Claim 1 or 2 , characterized in that the siphon (14) is filled with a water and / or dirt repellent grease depot (12). Wheel bearing for a motor vehicle with a rolling bearing (1) according to one of Claims 1 to 3 ,

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