CN213655483U

CN213655483U - Labyrinth type hub bearing unit sealing structure

Info

Publication number: CN213655483U
Application number: CN202021878897.5U
Authority: CN
Inventors: 黄德杰; 周旭; 汪峰
Original assignee: Wanxiang Group Corp; Zhejiang Wanxiang Precision Industry Co Ltd
Current assignee: Wanxiang Group Corp; Zhejiang Wanxiang Precision Industry Co Ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-07-09
Anticipated expiration: 2030-09-01

Abstract

The utility model discloses a labyrinth type wheel hub bearing unit sealing structure, which relates to the wheel hub bearing field, comprising an inner frame and an outer frame, wherein the inner frame is tightly attached to the inner diameter of an outer ring, the periphery of the inner frame is coated with inner rubber, the inner frame and the outer frame are glued and adhered into a whole, and at most two contact type lips are arranged on the inner rubber and are used for matching with the outer frame; the head of the outer framework is coated with outer rubber, the outer framework and the outer rubber are glued and adhered into a whole, one side of the outer rubber, which is far away from the outer ring, is tightly attached to the upper end face of the flange, the side edge of the outer framework, which is not coated with the outer rubber, is tightly attached to the lower end face of the flange, and the tail of the outer framework is tightly attached to the outer diameter face of the flange; and a plurality of lips are arranged on one side of the outer rubber close to the outer ring and used for matching with the outer ring. The utility model has high sealing performance, and can meet the intrusion resistance of external muddy water under various working conditions; the anti-leakage capability to lubricating grease in the bearing is strong; and a two-lip contact structure is adopted, so that the friction level of the bearing is greatly reduced.

Description

Labyrinth type hub bearing unit sealing structure

Technical Field

The utility model relates to a field of wheel hub bearing, concretely relates to labyrinth wheel hub bearing unit seal structure.

Background

The sealing structure at the bearing unit of the automobile hub is mainly used for sealing the bearing, and prevents impurities or water from entering the bearing to cause the early abrasion of the bearing so as to optimize the performance of the bearing.

The sealing structure at the hub bearing unit requires good sealing performance, and the friction torque at the sealing structure is not increased, so that the automobile has good performance.

The outer seal of the existing third-generation hub bearing unit generally adopts three contact lips, and the contact brings larger friction, so that the energy consumption of the whole vehicle is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of prior art existence, and provide a labyrinth wheel hub bearing unit seal structure, only adopt two contact lips to the labyrinth lip mouth that combines to adopt a plurality of non-contact carries out sealing in advance, thereby not only realizes reducing friction torque, also realizes the good sealing to the wheel hub bearing.

The purpose of the utility model is accomplished through following technical scheme: the labyrinth type hub bearing unit sealing structure is arranged between an outer ring and a flange of a hub bearing unit, the outer ring is provided with an outer ring inner diameter and an outer ring outer diameter, an outer ring guide groove is formed along the outer ring outer diameter in the radial direction, an outer ring end groove is axially formed in the end surface between the outer ring inner diameter and the outer ring outer diameter, the flange is provided with a flange end surface and a flange outer diameter surface which are perpendicular to each other, the position, close to the flange outer diameter surface, on the flange end surface is a flange lower end surface, and a sunken position above the flange lower end surface forms a flange upper; the structure comprises an inner framework and an outer framework, wherein the inner framework is tightly attached to the inner diameter of an outer ring, inner rubber is coated on the periphery of the inner framework, the inner framework and the outer framework are glued and adhered into a whole, and at most two contact type lips are arranged on the inner rubber and are used for being matched with the outer framework; the head of the outer framework is coated with outer rubber, the outer framework and the outer rubber are glued and adhered into a whole, one side of the outer rubber, which is far away from the outer ring, is tightly attached to the upper end face of the flange, the side edge of the outer framework, which is not coated with the outer rubber, is tightly attached to the lower end face of the flange, and the tail of the outer framework is tightly attached to the outer diameter face of the flange; and a plurality of lips are arranged on one side of the outer rubber close to the outer ring and used for matching with the outer ring.

As a further technical scheme, the outer ring guide groove is matched with the outer diameter of the outer ring to form a fixed diversion groove, and the outer rubber is matched with the flange to form a rotary diversion groove; an outer top lip formed by extending the top of the outer rubber to the outer ring is positioned above the outer ring, at least one part of the outer top lip covers the outer ring, and a gap is formed between the outer top lip and the outer ring; the outer side lip formed by extending the outer rubber to the outer ring at the position close to the end groove of the outer ring extends into the end groove of the outer ring.

Preferably, a gap is formed between the outer side lip and the outer ring end groove, so that the outer side lip is in clearance fit with the outer ring.

As a further technical scheme, interior lip in advance, inscription lip A and inscription lip B are equipped with in proper order down on the interior rubber from last, and interior rubber is close to flange up end department and extends to outer skeleton and form the interior lip in advance, extends to outer skeleton by interior rubber is close to flange lower extreme end face department and forms inscription lip A and outer skeleton interference fit, extends to outer skeleton by interior rubber is close to flange outer diametric plane department and forms inscription lip B and outer skeleton interference fit.

As a preferable technical scheme, a gap is arranged between the inner pre-lip and the outer framework, and the inner pre-lip and the outer framework are in clearance fit.

The utility model has the advantages that:

1. the invasion resistance of the hub bearing unit to external muddy water under various working conditions is met, and high sealing performance is achieved;

2. the leakage resistance of the hub bearing unit to the internal grease under various working conditions is met, and the high leakage resistance is achieved;

3. and a unique two-lip contact type structural design is adopted, so that the friction level of the bearing is greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged schematic view of a region a in fig. 1.

Fig. 3 is a schematic view of the present invention when resisting muddy water.

FIG. 4 is a schematic view of the flow path of the muddy water along the fixed guide groove under the action of gravity.

Description of reference numerals: the outer ring comprises an outer ring 1, an outer ring guide groove 2, an outer ring end groove 3, an outer ring inner diameter 4, an inner framework 5, inner rubber 6, an inner pre-lip 7, an inner connecting lip A8, an inner connecting lip B9, a flange 10, a flange upper end surface 11, a flange lower end surface 12, a flange outer diameter surface 13, an outer framework 14, outer rubber 15, an outer top lip 16, an outer side lip 17, muddy water 18, a fixed diversion groove 19 and a rotary diversion groove 20.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings:

example (b): as shown in fig. 1, the labyrinth hub bearing unit sealing structure is disposed on the outer side (between the outer ring 1 and the flange 10) of the third generation hub bearing unit, i.e., near the wheel side, and generates a sealing effect on the outer side of the hub bearing. As shown in fig. 2, the outer ring 1 has an outer ring inner diameter 4 and an outer ring outer diameter, an outer ring guide groove 2 is radially formed along the outer ring outer diameter, an outer ring end groove 3 is axially formed at an end surface between the outer ring inner diameter 4 and the outer ring outer diameter, the flange 10 has a flange end surface and a flange outer diameter surface 13 which are perpendicular to each other, a flange lower end surface 12 is formed on the flange end surface near the flange outer diameter surface 13, and a flange upper end surface 11 is formed at a recessed position above the flange lower end surface 12.

As shown in fig. 2, the labyrinth hub bearing unit sealing structure comprises an inner frame 5 and an outer frame 14, wherein the inner frame 5 is tightly attached to an outer ring inner diameter 4, the inner frame 4 and the outer ring inner diameter 4 are in interference fit, the outer periphery of the inner frame 4 is coated with inner rubber 6, the inner frame and the outer ring are glued and adhered into a whole, and an inner pre-lip 7, an inner contact lip A8 and an inner contact lip B9 are sequentially arranged on one side of the inner rubber 6, which faces a flange 10, from top to bottom and are used for being matched with the outer frame 14. The inner rubber 6 extends to the outer framework 14 at a position close to the upper end face 11 of the flange to form an inner pre-lip 7, and a gap is formed between the inner pre-lip 7 and the outer framework 14 and is in clearance fit with the inner pre-lip 7 and the outer framework 14; an inner contact lip A8 formed by extending the inner rubber 6 to the outer skeleton 14 near the lower end face 12 of the flange is in interference fit with the outer skeleton 14 (preferably, lubricating grease is adopted between the inner rubber and the outer skeleton); an inner lip B9 formed by extending the inner rubber 6 to the outer skeleton 14 at a position close to the outer diameter surface 13 of the flange is in interference fit with the outer skeleton 14, so that the leakage of lubricating grease in the bearing can be effectively prevented.

As shown in fig. 3, the outer ring guide groove 2 and the outer ring 1 are matched in outer diameter to form a fixed diversion groove 19, and the outer rubber 15 and the flange 10 are matched to form a rotary diversion groove 20. The outer framework 14 and the outer diameter surface 13 of the flange are in interference fit, the head of the outer framework 14 is coated with outer rubber 15, the outer framework and the outer diameter surface are glued and adhered into a whole, one side, far away from the outer ring 1, of the outer rubber 15 is tightly attached to the upper end surface 11 of the flange, the side edge, which is not coated with the outer rubber 15, of the outer framework 14 is tightly attached to the lower end surface 12 of the flange, and the tail of the outer framework 14 is tightly attached to the outer diameter surface 13 of the flange; an outer side lip 15 and an outer top lip 16 are arranged on one side, close to the outer ring 1, of the outer rubber 15 and are used for matching with the outer ring 1. An outer top lip 16 formed by extending the top of the outer rubber 15 to the outer ring 1 is positioned above the outer ring 1, at least one part of the outer top lip covers the outer ring 1, and a gap is formed between the outer top lip 16 and the outer ring 1; an outer side lip 15 formed by extending the outer rubber 15 to the outer ring 1 at a position close to the outer ring end groove 3 extends into the outer ring end groove 3 but is not contacted with each other, so that the outer side lip 15 is in clearance fit with the outer ring 1.

When the automobile runs, the outer ring 1 is fixed with the automobile body and does not rotate, so that the outer ring 1, the inner framework 5 and the inner rubber 6 are all static parts. Meanwhile, the wheel drives the flange 10 to rotate together, so that the flange 10, the outer framework 14 and the outer rubber 15 are all rotating parts.

When the bearing operates, the internal temperature is increased, the internal temperature of the bearing is far higher than the external temperature, pressure difference is formed due to the internal and external temperature difference, and the internal pressure is higher than the external pressure. Referring to fig. 2, the inner lip B9 will cling to the inner edge of the outer frame 14 due to internal pressure, thereby effectively preventing grease leakage.

The utility model discloses a working process: referring to fig. 3, the outer ring guide groove 2 is matched with the outer diameter of the outer ring 1 to form a fixed diversion groove 19, and the outer rubber 15 is matched with the flange 10 to form a rotary diversion groove 20. When external muddy water 18 invades, the utility model discloses the structure has 4 stops altogether, as follows respectively:

blocking the No. 1: the muddy water 18 is introduced from three directions, the first direction is a side wall of the outer ring 1 (i.e., the leftmost arrow in fig. 3), the second direction is a space section between the outer ring 1 and the flange 10 (i.e., the arrow located at the middle in fig. 3), and the third direction is a side wall of the flange 10 (i.e., the rightmost arrow in fig. 3), and the muddy water 18 in the three directions is introduced into the fixed guide groove 19 and the rotary guide groove 20. Referring to fig. 4, the muddy water 18 first collected in the fixed guide groove 19 flows down the fixed guide groove 19 along the side wall of the outer ring 1 from both circumferential directions by its own weight and is separated from the hub bearing unit. The muddy water 18 in the rotating guide groove 20 is also separated from the hub bearing unit by flowing down along the side wall of the flange 10 from both circumferential directions in a similar manner as shown in fig. 4. At the same time, the guiding of the muddy water 18 is accelerated due to the effect of the flange 10 rotating during operation.

And (2) blocking: when the external muddy water 18 flows into the outer lip end groove 3, the muddy water overflows from the rotary guide groove 20 and enters the fixed guide groove 19 along the outer wall of the outer top lip 16, and the fixed guide groove 19 receives the muddy water 18 from three directions, and if the amount of the muddy water is excessive, the muddy water 18 overflows from the fixed guide groove 19 and enters the outer lip 15 along the gap between the outer ring 1 and the outer top lip 16 (is gathered in the gap between the outer lip 15 and the outer ring end groove 3). Similarly, a pattern similar to that of fig. 4 also occurs, in which the muddy water 18 is separated from the hub bearing unit from both circumferential directions downstream along the outer lip 15. At the same time, the outer rubber 15 rotates along with the flange 10, so that the slurry 18 is accelerated to be guided and separated from the bearing.

And 3, blocking: when the muddy water 18 is not stopped and discharged in time by the outer lip 15, the muddy water 18 intrudes into the inner pre-lip a7 (converges in the gap between the inner pre-lip a7 and the outer frame 14). Similarly, a similar pattern as in FIG. 4 occurs, with the muddy water 18 flowing down the inner pre-lip A7, exiting the hub bearing unit. Meanwhile, the bearing rotates to drive the flange 10 to rotate together, so that the effect of guiding the muddy water 18 and separating from the bearing is enhanced.

And 4, blocking: when the flow rate of the external muddy water 18 exceeds the bearing capacity of the inner pre-lip a7, the muddy water 18 further enters the inner lip A8 (is gathered between the inner lip A8 and the outer frame 14), and the inner lip A8 and the outer frame 14 are in interference fit, so that the muddy water 18 is directly shielded. When the hub bearing works, the flange 10 rotates to enable the outer skeleton 14 and the inner contact lip A8 to form relative movement, the interference fit position of the outer skeleton and the inner contact lip A8 is lubricated by lubricating grease, the friction wear of the inner contact lip A8 is reduced, obviously, the friction wear of the contact interface is also increased due to the fact that the muddy water 18 invades into the contact interface, however, when the muddy water 18 passes through the front 3 blocks, the amount of the muddy water capable of entering the blocking position of the 4 th block is small, and as long as the abrasion amount between the outer skeleton 14 and the inner contact lip A8 is not larger than the contact interference amount, the blocking effect of the outside muddy water 18 is always kept at the position.

It should be understood that equivalent substitutions or changes to the technical solution and the inventive concept of the present invention should be considered to fall within the scope of the appended claims for the skilled person.

Claims

1. The utility model provides a labyrinth wheel hub bearing unit seal structure arranges in between wheel hub bearing unit's outer lane (1) and flange (10), outer lane (1) has outer lane internal diameter (4) and outer lane external diameter, radially offers outer lane guide slot (2) along the outer lane external diameter, and outer lane end groove (3) are offered to terminal surface department axial between outer lane internal diameter (4) and the outer lane external diameter, flange (10) have mutually perpendicular's flange terminal surface and flange external diameter face (13), are close to flange external diameter face (13) on the flange terminal surface and locate to be terminal surface (12) under the flange, and terminal surface (12) top depressed place forms flange up end (11) under the flange, its characterized in that: the inner framework (5) is tightly attached to the inner diameter (4) of the outer ring, inner rubber (6) is coated on the periphery of the inner framework (5), the inner framework and the outer framework are bonded into a whole, and at most two contact type lips are arranged on the inner rubber (6) and used for being matched with the outer framework (14); the head of the outer framework (14) is coated with outer rubber (15), the outer rubber (15) and the outer rubber are glued and adhered into a whole, one side, far away from the outer ring (1), of the outer rubber (15) is tightly attached to the upper end face (11) of the flange, the side edge, which is not coated with the outer rubber (15), of the outer framework (14) is tightly attached to the lower end face (12) of the flange, and the tail of the outer framework (14) is tightly attached to the outer diameter face (13) of the flange; and a plurality of lips used for matching the outer ring (1) are arranged on one side of the outer rubber (15) close to the outer ring (1).

2. The labyrinth hub bearing unit seal structure as recited in claim 1, wherein: the outer ring guide groove (2) is matched with the outer diameter of the outer ring (1) to form a fixed diversion groove (19), and the outer rubber (15) is matched with the flange (10) to form a rotary diversion groove (20); an outer top lip (16) formed by extending the top of the outer rubber (15) to the outer ring (1) is positioned above the outer ring (1), at least one part of the outer top lip covers the outer ring (1), and a gap is formed between the outer top lip (16) and the outer ring (1); an outer side lip (17) formed by extending the outer rubber (15) to the outer ring (1) at a position close to the outer ring end groove (3) extends into the outer ring end groove (3).

3. The labyrinth hub bearing unit seal structure as recited in claim 2, wherein: a gap is arranged between the outer side lip (17) and the outer ring end groove (3), so that the outer side lip (17) is in clearance fit with the outer ring (1).

4. The labyrinth hub bearing unit sealing structure according to claim 1 or 2, characterized in that: interior rubber (6) are gone up from last to being equipped with interior lip (7) in advance, inscription lip A (8) and inscription lip B (9) down in proper order, and interior rubber (6) are close to flange up end (11) and locate to extend to outer skeleton (14) and form in advance lip (7), and locate to extend to outer skeleton (14) inscription lip A (8) and outer skeleton (14) interference fit that forms by interior rubber (6) are close to flange down terminal surface (12), and locate to extend to outer skeleton (14) by interior rubber (6) and locate to extend to inner lip B (9) and outer skeleton (14) interference fit that forms.

5. The labyrinth hub bearing unit seal structure as recited in claim 4, wherein: a gap is arranged between the inner pre-lip (7) and the outer framework (14), and the inner pre-lip and the outer framework are in clearance fit.

6. The labyrinth hub bearing unit seal structure as recited in claim 4, wherein: the interference fit position of the inner connecting lip A (8) and the outer framework (14) is lubricated by lubricating grease.