CN117917511A - Box type sealing assembly for hub bearing and hub bearing unit - Google Patents

Box type sealing assembly for hub bearing and hub bearing unit Download PDF

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Publication number
CN117917511A
CN117917511A CN202211287785.6A CN202211287785A CN117917511A CN 117917511 A CN117917511 A CN 117917511A CN 202211287785 A CN202211287785 A CN 202211287785A CN 117917511 A CN117917511 A CN 117917511A
Authority
CN
China
Prior art keywords
sealing lip
sealing
seal
hub
bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211287785.6A
Other languages
Chinese (zh)
Inventor
张岳林
谢弗·马克·安德列
张叶舟
宫铭
刘鑫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to CN202211287785.6A priority Critical patent/CN117917511A/en
Priority to DE102023122246.5A priority patent/DE102023122246A1/en
Publication of CN117917511A publication Critical patent/CN117917511A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0073—Hubs characterised by sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/001—Hubs with roller-bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/02—Hubs adapted to be rotatably arranged on axle
    • B60B27/023—Hubs adapted to be rotatably arranged on axle specially adapted for bicycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
    • F16C19/386—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7813—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for tapered roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
    • F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Of Bearings (AREA)

Abstract

The invention relates to a box seal assembly (1) for sealing a wheel bearing (10) of a passenger car or truck, comprising an angled sheet metal ring (2) and an annular sealing device (4). Wherein the sealing device (4) comprises a support ring (6) and a radial circumferential seal (7) having at least one first sealing lip (7 a) and one second sealing lip (7 b), wherein the seal (7) is fastened to the support ring (6), wherein the at least one sealing lip (7 a,7b,7 c) rests in a sealing manner on the angled sheet metal ring (2), wherein the first and second sealing lips (7 a,7 b) are designed as radial sealing lips, and wherein the first sealing lip (7 a) is designed as distance from the angled sheet metal ring (2) in the axial direction (A). The invention further relates to a hub bearing unit with a box seal (1) according to the invention.

Description

Box type sealing assembly for hub bearing and hub bearing unit
Technical Field
The present invention relates to a cartridge type seal assembly for sealing a wheel bearing of a passenger car or truck, and a hub bearing unit having such a cartridge type seal assembly.
Background
The cartridge type seal is used to seal a hub bearing of an automobile or truck, protect a rolling element space of the hub bearing, and prevent water, dust, etc. from entering from the outside. The cartridge seal assembly is typically designed as a two-part assembly in which an angled sheet metal ring that forms a first part of the assembly is pressed against the inner race of the hub bearing, while a seal that is pressed against the hub or similar rotatably mounted on the hub bearing forms a second part of the assembly. The angled sheet metal ring and the sealing means are designed in such a way that they define an annular sealing means.
In the prior art in the field of hub bearings, box seals are known. For example, DE 10 2007 057 962 B4 shows a box seal with an angled sheet metal ring and a sealing device for sealing between an inner ring and an outer ring. The sealing means has several sealing lips in contact with the support ring and a labyrinth seal, which makes dust and water difficult to enter.
In particular in the field of truck hub bearings, it is known to seal the bearing chamber by means of a box seal on one side and an oil seal on the other side. The task of the cassette seal is to seal against dust and water from outside. The oil seal is used for sealing gear oil. Thus, both sealing means are external seals. Under extreme conditions, such as overload of the vehicle or poor road conditions, it is possible that oil enters the bearing chamber through the oil seal. This incoming oil then migrates to the box seal and may flow out of it. Because the box-type sealing ring only seals the outside, oil can leak out, resulting in short service life of the bearing.
Furthermore, in case of external influences, such as extreme braking, the pressure in the bearing may increase in a short time. Since both the box seal and the oil seal are sealed outward, this excessive pressure is released from the bearing chamber to the outside through the two seal rings. When the bearing is subsequently run again under normal conditions and normal temperatures, a negative pressure is created in the bearing cavity. In this case, both sealing means have to seal against higher pressures outside the bearing, which would lead to higher friction forces and also to wear of the sealing lips.
Against this background, the object of the present invention is to provide a cartridge seal assembly which overcomes these disadvantages and thus prevents oil leakage on the one hand and has a low friction on the other hand.
Disclosure of Invention
These and other tasks that remain mentioned upon reading the following description, or that will be recognized by those skilled in the art, are found in the advantageous embodiments and descriptions that follow.
According to the invention, a box seal assembly for sealing a hub bearing of a passenger car or truck has an angled sheet metal ring which is connected in a rotationally fixed manner to an inner ring, and an annular seal which is connected in a rotationally fixed manner to an outer ring or hub. Wherein the sealing device comprises a support ring and a radial circumferential seal having at least a first sealing lip and a second sealing lip, wherein the seal is fixed to the support ring and at least one sealing lip is sealingly received by an angled sheet metal ring, wherein the first and second sealing lips are formed as radial sealing lips. The first sealing lip is designed to be axially remote from the sheet metal ring.
The first sealing lip is designed to be remote from the angled sheet metal ring and to effectively seal the bearing chamber from the outer region of the bearing. In extreme cases during driving, the oil entering from the oil seal cannot escape to the outside through the box seal. The first sealing lip is directed towards the bearing chamber and seals it.
Preferably, the first sealing lip is supported in a sealing manner in the radial direction on the angled sheet metal ring. The sheet metal ring is preferably L-shaped with legs of the L being connected to the inner ring.
However, in another embodiment, it is also conceivable for the first sealing lip to be supported on the inner ring in a sealing manner in the radial direction. In this embodiment, the L-shaped legs of the sheet metal ring may be designed to be axially shorter.
Preferably, the first sealing lip has a structured surface. In the structured surface region, the first sealing lip contacts and seals against the angled sheet metal ring or inner ring. It is particularly preferred that the structured surface is formed by one or more grooves. The structured surface may extend around the first sealing lip or may extend only over a portion of the first sealing lip. The structured surface on the first seal lip conveys oil entering from the oil seal toward the oil seal. Leakage through the box seal can be effectively prevented.
According to one embodiment, the first sealing lip and/or the second sealing lip has an antifriction layer. For example, the layer may be made of PTFE. For example, the friction reducing layer may be vulcanized onto the sealing lip. In this way, friction on the sealing lip can be further reduced.
Preferably, the structured surface is provided in or on the friction reducing layer. In this design, the first sealing lip thus has an antifriction layer made of PTFE, for example, into which a structured surface is introduced.
In one embodiment, the entire surfaces of the first and second sealing lips facing the inner ring or the angled sheet metal ring form an antifriction layer.
It is particularly preferred that the first sealing lip is designed to be impermeable to air and oil in both axial directions. Thus, on the one hand, the first sealing lip can effectively seal against dust and water ingress. On the other hand, the design of the first sealing lip according to the invention also prevents leakage of oil and accumulation of negative pressure in the bearing chamber.
Another aspect of the invention relates to a wheel bearing unit for a car or truck comprising a journal, a hub and a wheel bearing formed and/or arranged to rotatably support the hub on the journal, wherein there is a cartridge seal assembly of any of the preceding aspects, wherein the cartridge seal assembly is arranged to seal the wheel bearing.
Drawings
Further measures to improve the invention will be shown in more detail below with reference to the drawings together with a description of a preferred embodiment of the invention. It indicates that.
FIG. 1 is a schematic illustration of a wheel bearing structure layout according to the prior art;
FIG. 2 is a detailed view of the cartridge seal according to FIG. 1;
FIG. 3 is a cartridge seal assembly according to the present invention;
FIG. 3a is a detailed view of a first sealing lip of the cartridge seal assembly according to FIG. 3;
FIG. 4 is another embodiment of a cartridge seal assembly according to the present invention;
Fig. 5 is a third embodiment of a cartridge seal assembly according to the present invention.
These figures are only schematic and are only intended to aid in the understanding of the invention. Like elements are labeled with like reference numerals.
Detailed Description
Fig. 1 shows a schematic layout of a wheel bearing structure for a passenger car or truck. The hub-bearing assembly comprises a journal (not shown) on which a hub bearing 10 in the form of a double row tapered roller bearing is mounted in axial tension. The hub bearing 10 has two inner rings 3 and two outer rings 5, and a plurality of tapered rollers are rotatably installed between the inner rings 3 and the outer rings 5. The outer ring 5 is pressed into a hub 20 which is designed to receive a rim and optionally a brake disc (both not shown). Thus, the hub 20 is journalled by the hub bearing 10 so that it can rotate about the axis of rotation. In order to fix the inner ring 3 to the journal, the wheel bearing assembly has a lock nut.
One side of the hub bearing 10 is sealed by the cartridge sealing assembly 1 and the other side is sealed by the oil seal 30 to prevent dust from entering from the outside. The cartridge seal assembly 1 and the oil seal 30 may be of the same design. The cartridge seal assembly 1 is designed as a circumferential sealing ring which seals the hub 20 from the inner ring 3, thereby protecting the wheel bearing space.
In extreme driving conditions, such as rough road conditions or vehicle overload, the oil seal 30 may be subjected to extreme pressure, thereby allowing transmission oil to enter the storage compartment through the oil seal 30. From there, the oil can migrate to the cartridge seal assembly 1 with the potential for leakage. Fig. 2 shows the prior art cartridge seal assembly 1 in more detail.
The cartridge seal assembly 1 has an angled sheet metal ring 2 which is substantially L-shaped and is pressed or secured against the inner ring 3 with an axial leg. Furthermore, the sheet metal ring 2 has a radial leg. The cartridge seal assembly 1 also has a sealing device 4 with a support ring 6 and a seal 7. The support ring 6 is connected to the outer ring by an axial leg, in this case the hub 20. The radial legs of the support ring 6 carry the seal 7. The seal preferably has several sealing lips 7a, 7b, 7c. In particular, the seal has a first radial sealing lip 7a and a second radial sealing lip 7b. Furthermore, the seal 7 may have a third axial sealing lip 7c which is in contact with the radial leg of the angled sheet metal ring 2.
In the prior art, the first radial sealing lip 7a is designed in such a way that it points in the axial direction towards the angled sheet metal ring 2. However, due to this design, the incoming oil may leak out of the bearing. The prior art cartridge sealing assembly 1 seals only outwardly to prevent dust and water from entering the bearing. However, the seals do not prevent oil from leaking back out of the bearing.
Fig. 3 shows a cartridge seal assembly 1 according to the present invention. Such a cartridge seal assembly 1 can prevent oil from leaking out of the wheel bearing 10. The cartridge seal assembly 1 has an angled sheet metal ring 2 secured to an inner ring 3 by an axial leg. The angled sheet metal ring 2 also has a radial leg, which is connected to the axial leg by an obliquely extending transition region. The cartridge sealing device 1 further comprises a support ring 6 which is fixed to the outer ring 5 or to the hub 20. For fastening to the outer ring, the support ring 6 has an axial foot. The axial legs of the support ring are also connected to the radial legs by an oblique transition zone. A circumferential seal 7 is located on the radial leg of the support ring 6.
The seal 7 has at least a first sealing lip 7a and a second sealing lip 7b. The first sealing lip 7a and the second sealing lip 7b are designed as radial sealing lips for sealing the bearing chamber 40 (see fig. 1) on the inner ring 3 and/or on the axial leg of the angled sheet metal ring 2. The second sealing lip 7b can preferably be preloaded by means of a spring element 8 which reinforces the seal. According to the invention, the first sealing lip 7a is designed to be remote from the sheet metal ring 2 in the axial direction a. Therefore, the direction of the first seal lip 7a extends toward the direction of the bearing chamber 40. In this way, oil entering the bearing chamber 40 through the oil seal 30 can be prevented from exiting the bearing through the cartridge seal assembly 1. At the same time, the cassette seal assembly 1 can also be protected from dust and water from outside by at least one third sealing lip 7c which is formed axially and rests on the radial legs of the sheet metal ring 2. In the event of thermal overload, for example in extreme braking conditions, the cartridge seal assembly 1 according to the invention ensures that no air is discharged from the bearing to the outside. The cartridge seal assembly 1 is sealed in both axial directions a. This means that there is no pressure difference between the bearing chamber and the outside of the bearing. As long as there is a normal temperature, a constant low friction is expected since the pressure inside and outside the bearing is the same. Thus, the service life of the seal assembly and the service life of the bearing may be improved.
Preferably, the first sealing lip 7a has a structured surface 9 (see fig. 3 a). This structured surface 9 is preferably arranged in the area of contact with the inner ring 3 or the sheet metal ring 2. The structured surface 9 is preferably in the form of grooves or the like. It is conceivable that the structured surface 9 is arranged over the entire circumference of the first sealing lip 7a or only in a partial region of the sealing lip 7a. The structured surface 9 conveys the oil on the first sealing lip 7a back to the bearing chamber 40. Leakage can be prevented.
Fig. 4 shows another preferred embodiment of the cartridge seal assembly 1. The seal assembly 1 corresponds substantially to the structure in fig. 3. The first sealing lip 7a is provided with an antifriction layer here. For example, the layer may be PTFE. For example, it may be vulcanized on the first sealing lip 7 a.
As shown in fig. 5, both the first sealing lip 7a and the second sealing lip 7b may be provided with an antifriction layer. This layer is formed in particular on the surface of the sealing lips 7a, 7b facing the inner ring 3 or the sheet metal ring 2. As can be seen in fig. 5, the entire surface of the seal 7 facing the inner ring 3 preferably has a friction reducing layer.
List of reference numerals
1. Box type sealing assembly
2. Angled sheet metal ring
3. Inner ring
4. Sealing device
5. Outer ring
6. Support ring
7. Sealing element
7A first sealing lip
7B second sealing lip
7C third sealing lip
8. Spring element
9. Structured surface
10. Hub bearing
20. Hub
30. Oil seal
40. Bearing chamber
Axis A axis
R radial direction

Claims (10)

1. A cartridge seal assembly (1) for a hub bearing (10) of a passenger car or truck, having an angled sheet metal ring (2) for connection in a rotationally fixed manner with an inner ring (3), having an annular seal arrangement (4) for connection in a rotationally fixed manner with an outer ring (5) or a hub (20), said seal arrangement (4) comprising a support ring (6) and a radial circumferential seal (7) having at least one first sealing lip (7 a) and one second sealing lip (7 b), said seal (7) being fixed to the support ring (6), at least one sealing lip (7 a,7b,7 c) being sealingly connected to the angled sheet metal ring (2), the first and second sealing lips (7 a,7 b) being designed as radial sealing lips, characterized in that the first sealing lip (7 a) is designed as radial sealing lips in the axial direction (a) away from the angled sheet metal ring (2).
2. The cartridge seal assembly (1) according to claim 1, wherein the first sealing lip (7 a) is sealingly supported on the angled sheet metal ring (2) in a radial direction (R).
3. The cartridge seal assembly (1) according to claim 1, wherein the first sealing lip (7 a) is sealingly supported on the inner ring (3) in a radial direction (R).
4. A cartridge seal assembly (1) according to any of the preceding claims 1 to 3, wherein the first sealing lip (7) has a structured surface (9).
5. The cartridge seal assembly (1) of claim 4, wherein the structured surface (9) has one or more grooves.
6. A cartridge seal assembly (1) according to any one of claims 1 to 3, wherein the first sealing lip (7 a) and/or the second sealing lip (7 b) has a friction reducing layer, such as PTFE.
7. The cartridge sealing assembly (1) according to claim 4, wherein the structured surface (9) is provided in an antifriction layer.
8. A cartridge seal assembly (1) according to any one of claims 1 to 3, wherein the second sealing lip (7 b) is preloaded with a spring element (8).
9. A cartridge seal assembly (1) according to any of the preceding claims 1 to 3, characterized in that the first sealing lip (7 a) is designed to be gas-and oil-impermeable in both axial directions (a).
10. Hub-bearing unit for a car or truck comprising a journal, a hub and a hub-bearing (10), wherein the hub-bearing (10) is formed and/or arranged to rotatably support the hub (20) on the journal, characterized by comprising a cartridge seal (1) according to any of the preceding claims, wherein the cartridge seal (1) is arranged to seal said hub-bearing (10).
CN202211287785.6A 2022-10-20 2022-10-20 Box type sealing assembly for hub bearing and hub bearing unit Pending CN117917511A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202211287785.6A CN117917511A (en) 2022-10-20 2022-10-20 Box type sealing assembly for hub bearing and hub bearing unit
DE102023122246.5A DE102023122246A1 (en) 2022-10-20 2023-08-21 Cassette seal assembly for wheel hub bearing and wheel hub bearing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211287785.6A CN117917511A (en) 2022-10-20 2022-10-20 Box type sealing assembly for hub bearing and hub bearing unit

Publications (1)

Publication Number Publication Date
CN117917511A true CN117917511A (en) 2024-04-23

Family

ID=90572825

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211287785.6A Pending CN117917511A (en) 2022-10-20 2022-10-20 Box type sealing assembly for hub bearing and hub bearing unit

Country Status (2)

Country Link
CN (1) CN117917511A (en)
DE (1) DE102023122246A1 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007057962B4 (en) 2007-12-01 2022-04-14 Schaeffler Technologies AG & Co. KG Cassette seal and wheel bearing with the cassette seal

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