KR20170025427A - Encoder seal assembly, and wheel bearing having the same for vehicle - Google Patents

Encoder seal assembly, and wheel bearing having the same for vehicle Download PDF

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Publication number
KR20170025427A
KR20170025427A KR1020150121851A KR20150121851A KR20170025427A KR 20170025427 A KR20170025427 A KR 20170025427A KR 1020150121851 A KR1020150121851 A KR 1020150121851A KR 20150121851 A KR20150121851 A KR 20150121851A KR 20170025427 A KR20170025427 A KR 20170025427A
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KR
South Korea
Prior art keywords
inner ring
support
encoder
extending
radially
Prior art date
Application number
KR1020150121851A
Other languages
Korean (ko)
Other versions
KR101751895B1 (en
Inventor
이만철
Original Assignee
주식회사 일진베어링
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Priority to KR1020150121851A priority Critical patent/KR101751895B1/en
Publication of KR20170025427A publication Critical patent/KR20170025427A/en
Application granted granted Critical
Publication of KR101751895B1 publication Critical patent/KR101751895B1/en

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0047—Hubs characterised by functional integration of other elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0047—Hubs characterised by functional integration of other elements
    • B60B27/0068—Hubs characterised by functional integration of other elements the element being a sensor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/18—Arrangement of 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2360/00—Materials; Physical forms thereof
    • B60B2360/50—Rubbers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2900/00—Purpose of invention
    • B60B2900/10—Reduction of
    • B60B2900/133—Noise
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2900/00—Purpose of invention
    • B60B2900/50—Improvement of
    • B60B2900/511—Sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2900/00—Purpose of invention
    • B60B2900/50—Improvement of
    • B60B2900/511—Sealing
    • B60B2900/5112—Sealing against dust or dirt

Abstract

The present invention relates to an encoder seal assembly and an automotive wheel bearing having the same. The automotive wheel bearing includes an inner ring coupled to an outer circumferential surface of a rotating body and rotating together with the rotating body, A bearing assembly comprising: a first support, mounted on an outer circumferential surface of the inner ring and extending radially outwardly, to seal a space between the outer ring and the inner ring, A second support mounted on an inner circumferential surface of the outer ring, the other end of the second support extending radially inward from the other side of the first support; A rubber member for sealing a space formed between the first support and the second support; An encoder mounted on the first support and rotated integrally with the first support; Wherein the encoder is disposed radially outward of the rubber member.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an encoder seal assembly,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encoder seal assembly and a vehicle wheel bearing having the same. More particularly, the present invention relates to an encoder seal assembly for protecting an encoder from external foreign matter and reducing drag torque, and a vehicle wheel bearing having the same.

In general, a bearing is a device mounted between a rotating element and a non-rotating element to facilitate rotation of the rotating element. Currently, various bearings such as ball bearings, roller bearings, tapered bearings, and needle bearings are used.

Wheel bearings are one type of such bearings and serve to rotatably connect the wheel, which is a rotating element, to the vehicle body which is a non-rotating element. Such a wheel bearing includes an inner ring (and / or hub) connected to one of the wheels or the vehicle body, an outer ring connected to the other one of the wheel or the vehicle body, and an inner ring (and / or hub) And a rolling member capable of smooth relative rotation.

However, for smooth relative rotation between the inner ring and the outer ring, a spacing space must necessarily be formed between the inner ring and the outer ring. Foreign particles, such as dust, moisture or fine particles, It can be intruded inside. In the case where the foreign matter flows into the interior of the wheel bearing, particularly the portion where the rolling element is mounted, the raceway as the polishing surface may be damaged. Such a damaged raceway may cause noise and vibration during operation of the wheel bearing and shorten the life of the wheel bearing.

Therefore, at one end or both ends of the wheel bearing, there is a seal (not shown) for sealing the gap between the outer ring and the inner ring (and / or hub) in order to prevent foreign substances from entering from the outside and prevent leakage of lubricating oil filled in the periphery of the rolling body. The assembly is installed.

On the other hand, an encoder for detecting the rotational speed of the wheel, which is a rotating element, is used for the ABS (Anti-Brake System) of the vehicle. The encoder consists of permanent magnets with magnetic N and S poles, and these N and S poles are arranged alternately in the circumferential direction. Therefore, when the wheel as the rotating element rotates, the encoder generates a change in the magnetic field, and the change in the magnetic field is sensed through the sensor to detect or measure the rotational speed of the wheel.

However, since the structure of the wheel bearing equipped with the conventional encoder is such that the encoder is exposed to the outside of the seal assembly, the encoder may be easily damaged or contaminated by external foreign matter. Accordingly, the encoder may malfunction to frequently detect the rotational speed of the wheel, and the ABS braking device that operates based on the rotational speed of the wheel may not perform its function, There is a danger that a dangerous situation may arise.

Therefore, studies have been continued to prevent the encoder from being damaged from external foreign matter by installing a separate encoder protection cap on the wheel bearing.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and it is an object of the present invention to provide an encoder capable of effectively preventing damages of an encoder from an external foreign object by minimizing drag torque loss due to a seal lip, A seal assembly, and a vehicle wheel bearing with the seal assembly.

According to an embodiment of the present invention, there is provided an internal combustion engine including an inner ring coupled to an outer circumferential surface of a rotating rotor and rotating together with the rotor, and an outer ring spaced apart from the inner ring and coupled to the stationary body , An encoder seal assembly provided to seal a space between the outer ring and the inner ring may be provided.

The encoder seal assembly comprising: a first support mounted on an outer circumferential surface of the inner ring and extending radially outward; A second support mounted on an inner circumferential surface of the outer ring, the other end of the second support extending radially inward from the other side of the first support; A rubber member for sealing a space formed between the first support and the second support; An encoder mounted on the first support and rotated integrally with the first support; Wherein the encoder is disposed radially outward of the rubber member.

An inner race raceway formed in a shape curved at one side of the inner race; A first inner ring surface extending axially from the other end of the inner race raceway to the other side; A second inner ring surface bent and extended radially inward from the other end of the first inner ring surface; And a third inner ring surface extending axially from the radially inner end of the second inner ring surface toward the other axial end; Wherein the first support body is mounted on the first and second inner ring surfaces and extends radially outwardly and the second support body is mounted on the inner circumferential surface of the outer ring and extends so as to be adjacent to the third inner ring surface. can do.

The radially outer end of the encoder may be coupled to at least a portion of the first support.

The first support includes a first extension portion that is press-fitted into the first inner ring surface and extends in the axial direction; A second extending portion bent 180 degrees from one end of the first extending portion and extending to the other side in the axial direction; A first vertical part bent radially inward from the other end of the first extension part and coupled to the second inner ring surface; And a second vertical portion extending radially outward from one end of the second extension portion; And the second vertical portion extends to adjoin the second support body.

The radially outer side surface of the encoder is spaced apart from the one surface of the second support member by a first spacing distance and the radially inner end of the second support member is spaced apart from the third inner ring surface by a second spacing distance, The spacing distance and the second spacing distance may be set to be substantially equal to each other.

The first and second separation distances may be set to 0.5 mm.

The rubber member may surround a part of the first vertical part, and the rubber member may have at least one sealing lip contacting the one surface of the second supporting member.

And the rubber member is attached to a gap formed between the other ends of the first extending portion and the second extending portion.

And the sealing lips may be inclined at least on the other side in the axial direction and inward in the radial direction.

The second support body includes a cylindrical portion coupled to an inner circumferential surface of the outer ring; A first blocking portion extending radially inward from the other end of the cylindrical portion; An inclined portion that is inclined radially inward from the radially inward end of the first blocking portion and in the other axial direction; And a second blocking portion extending radially inward from the inclined portion; And a control unit.

And the at least one sealing lip contacts one surface of the second blocking portion.

And the other surface of the second blocking portion is disposed on one axial side of the other surface of the inner ring.

According to an embodiment of the present invention, it is possible to include an encoder seal assembly having the above-mentioned characteristics, wherein the rotating body can be a hub connected to wheels, and a vehicle wheel bearing in which a rolling body is interposed between the inner ring and the outer ring Can be provided.

As described above, according to the embodiment of the present invention, since the gap between the outer ring and the inner ring is sealed and the encoder is mounted inside the outer ring, it is possible to effectively prevent damage or contamination of the encoder from external foreign matter .

In addition, since the complicated labyrinth structure is formed by the outer and inner rings and the encoder seal assembly, the sealability of the encoder seal assembly is enhanced and the penetration of foreign matter is significantly reduced, thereby reducing the number of required seal lips , The drag torque can be improved by reducing the contact area where the distal ends of the seal lips contact each other.

Furthermore, according to an embodiment of the present invention, even if the encoder is mounted inside the encoder seal assembly, the required reading diameter of the wheel bearing can be ensured.

1 is a cross-sectional view of a wheel bearing with an encoder seal assembly according to an embodiment of the invention.
2 is an enlarged view of a portion "A" in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

For convenience of explanation, the axially closer side (left side in the figure) of the wheel is referred to as "one side", "one side", "one side" Quot; other side ", " other end ", " other end "

The parts denoted by the same reference numerals throughout the specification mean the same or similar components.

1 is a sectional view of a wheel bearing equipped with an encoder seal assembly according to an embodiment of the present invention, and Fig. 2 is an enlarged view of a portion "A "

The wheel bearing shown in Fig. 1 exemplifies one of various kinds of wheel bearings for convenience of description, and the technical idea of the present invention is not limited to the wheel bearings exemplified in this specification, Assembly.

1, a wheel bearing 1 according to an embodiment of the present invention includes a hub 10, an inner ring 11 press-fitted into the outer peripheral surface of the hub 10, a hub 10, A first rolling member 13 provided between the hub 10 and the outer ring 12; a first rolling member 13 provided between the outer ring 12 and the inner ring 11; A seed portion 19 mounted to block foreign matter flowing between the hub 10 and the outer ring 12 on both sides of the outer ring 12, (100).

The hub 10 includes a disk-like flange 15 extending radially outwardly from one side thereof, an intermediate portion 25 extending from the flange 15 to the other side, And a stepped inner ring mounting portion (35).

A bolt hole 17 is formed in the flange 15 and the hub bolt 59 is fixedly mounted to the bolt hole 17. [ The hub bolt 59 may be equipped with a brake disk or a wheel.

On one surface of the hub 10, a pilot 18 projects in the axial direction. The pilot 18 serves to guide the wheel when mounting the wheel on the flange 15.

A curved surface of the hub raceway 31 is formed between the flange 15 and the intermediate portion 25 so that the outer peripheral surface of the intermediate portion 25 from the other end of the hub raceway 31 is substantially flat . In the embodiment of the present invention, the hub raceway 31 is directly formed on the outer circumferential surface of the wheel hub 10, but the present invention is not limited thereto. That is, instead of using the hub raceway 31, an inner raceway can be formed on a separate inner ring. That is, two inner rings can be mounted on the hub 10 and an inner raceway can be formed on the outer peripheral surface of each of the inner rings.

The bending portion 50 is formed on the other side of the inner ring mounting portion 35 so as to extend radially outwardly by orbital forming and the bending portion 50 fixes the inner ring 11 mounted on the hub 10 in the axial direction And also acts to impart a preload (axial force) to the rolling elements 13 and 14.

The inner ring 11 has a generally cylindrical shape and is forcedly press-fitted into the outer peripheral surface of the inner ring mounting portion 35 of the hub 10 and the inner ring 11 forcibly press-fitted is firmly fixed by the bent portion 50. However, the method of fixing the inner ring 11 to the hub 10 is not limited thereto. For example, after the inner ring 11 is forcibly press-fitted into the stepped portion of the hub 10, a nut for contacting the other end surface of the inner ring 11 is separately provided, The inner ring 11 can be attached to the hub 10 by engaging with the nut.

An inner race raceway 32 having a curved shape is formed on one side of the outer circumferential surface of the inner ring 11 and a step is formed on the other side of the inner race 11 in the radial direction. That is, the first inner ring surface 11a extends axially from the other end of the inner race raceway 32 in the axial direction, and the other end of the second inner ring surface 11b extends radially inwardly. And a third inner ring face 11c extending to the other axial end side extends on the radially inner end of the second inner ring face 11b.

The outer ring 12 is formed into a hollow cylindrical shape so as to surround the outer circumferential surface of the hub 10. That is, a hollow in which the hub 10 and the inner ring 11 are inserted is formed inside the radius of the outer ring 12 along the hub central axis X1. The outer ring flange 39 is formed on the outer circumferential surface of the outer ring 12 so as to extend radially outward. The outer ring flange 39 has an outer ring bolt hole 37 for mounting the wheel bearing 1 on the vehicle body (particularly, the knuckle) Respectively.

The first and second outer race raceways 41 and 42 are formed on inner circumferential surfaces of both ends of the outer race 12. The first outer race raceway 41 formed on the inner peripheral surface of the one end of the outer race 12 is formed to face the hub raceway 31 with respect to each other. The second outer race raceway 42 formed on the inner peripheral surface of the other end of the outer race 12 is formed so as to face the inner race raceway 32.

The first rolling member 13 is provided between the hub raceway 31 and the first outer race raceway 41 and the second rolling member 14 is provided between the inner race raceway 32 and the second outer race raceway 42). A ball or a roller may be used for the first rolling member 13 and the second rolling member 14.

Each of the ball bearings including the first and second rolling elements 13 can be spaced apart from each other by a retainer or a cage 18 at regular intervals in the circumferential direction.

A seed part 19 coupled to one end of the outer ring 12 and an encoder seal assembly 100 coupled to the other end of the outer ring 12 close the radial space between the outer ring 12 and the hub 10 (Such as dust or moisture) entering the inside of the apparatus.

The encoder seal assembly 100 includes a first support 120 mounted on the inner ring 11 to block the spacing space formed between the inner ring 11 and the outer ring 12, And a second support body 220 spaced apart from the inner surface of the outer ring 12 by a predetermined distance. The first support body 120 extends radially outward from the outer circumferential surface of the inner ring 11 so as to be substantially in contact with the inner circumferential surface of the second support body 220 and the second support body 220 is mounted on the inner circumferential surface of the outer ring 12 And is bent radially inwardly from the other side in the axial direction of the first support body 120 so as to be substantially in contact with the outer peripheral surface of the inner ring 11. [ Accordingly, the entrance communicating with the outside by the encoder seal assembly 100 becomes narrow, and the first and second supports 120 and 220 form a labyrinth structure to block the entry of foreign matter.

Hereinafter, the encoder seal assembly 100 will be described in more detail with reference to FIG.

The first support body 120 includes a first extension portion 121 attached to the flat first inner ring surface 11a of the inner ring 11 and extending in the axial direction and a second extension portion 121 extending from the one end of the first extension portion 121 by 180 degrees And a second vertical portion 123 extending radially inward from the other end of the first extending portion 121 and mounted on the second inner ring surface 11b of the inner ring 11, And a second vertical part 127 extending radially outward from the other end of the second extension part 123 and being provided so as to be close to the inner circumferential surface of the second support body 220.

The first and second extension portions 121 and 123 extend in the axial direction and are in contact with each other to form a layer. The first and second vertical portions 125 and 127 extend from the first and second extension portions 121 and 123, 121, and 123 extending radially inwardly and outwardly from the other end. At this time, a gap G may be formed between the portions where the other ends of the first and second extension portions 121 and 123 are bent.

The first vertical part 125 is attached with the rubber member 150 so as to surround a part of the first vertical part 125. That is, the rubber member 150 covers the radially inner end and the other surface of the first vertical part 125, and covers the gap G formed outside the radius of the first vertical part 125. Accordingly, the rubber member 150 is firmly attached to the first vertical portion 125. Since the rubber member 150 is positioned at least radially inward of the outer circumferential surface of the second extended portion 123, the encoder 90 can be provided on the second vertical portion 127. [

The rubber member 150 includes first and second sealing lips 151 and 153 extending from the first vertical portion 125 and closely contacting one surface of the second support body 220. The first and second sealing lips 151 and 153 are formed to be spaced from each other in the radial direction and are inclined from the other surface of the first vertical portion 125 to the other axial side and radially inward. Accordingly, the first and second sealing lips 151 and 153 can effectively block the foreign matter introduced from the radially inward side.

However, according to the embodiment of the present invention, even if only the radial path is blocked by the first and second sealing lips 151 and 153, Performance can be assured, so that the contact area with other members of the sealing lips can be reduced. Therefore, the drag torque loss due to the sealing lips can be improved.

The encoder 90 is mounted on the second vertical portion 127 so as to rotate integrally. The encoder 90 detects the rotational speed of the wheel, and can be used in an ABS (Anti-Brake System) of a vehicle or the like.

The first and second sealing lips 151 and 153 of the rubber member 150 are disposed between the first inner ring surface 11a and the third inner ring surface 11c with respect to the radial direction as a whole. Therefore, the second vertical portion 127 extending radially outward from the other end of the second extending portion 123 has a space for mounting only the horizontal encoder 90. Even if the encoder 90 is mounted inside the encoder seal assembly 100, the second vertical portion 127 corresponds to the size of the spacing space formed between the inner ring 11 and the outer ring 12, The reading diameter can be ensured at least by the size of the spacing space between the inner ring 11 and the outer ring 12. Here, the leading diameter means the width between the outer peripheral surface and the inner peripheral surface of the encoder 90. Therefore, even if the encoder 90 is mounted inside the encoder seal assembly 100 according to the embodiment of the present invention, its performance is not degraded as compared with that mounted on the outside.

The encoder 90 includes a base portion 91 in which magnetic portions of N and S poles are alternately disposed in the circumferential direction, a first encoder 91 extending in the axial direction from the radially outer end of the base portion 91, An extension 93 and a second encoder extension 95 extending radially inwardly from one end of the first encoder extension 93. [ As such, the encoder 90 is disposed on the other side of the first support 120 and has a first encoder extension 93 at the radially outer end thereof and a second vertical extension 127 And the outer circumferential end of the outer circumferential surface

The second support body 220 includes a cylindrical portion 230 and a blocking portion 240.

The cylindrical portion 230 is coupled to the inner circumferential surface of the outer ring 12 and extends at least in the axial direction from one axial side of the second vertical portion 127 to the other end of the outer ring 12.

The blocking portion 240 includes a first blocking portion 241 extending radially inward from the other end of the cylindrical portion 230, a slope inclined radially inward from the radially inward end of the first blocking portion 241, And a second blocking portion 245 extending from the slope portion 243 to the inside inner surface 11c of the inner ring 11 and extending again radially inward.

The other surface of the second blocking portion 245 is formed substantially close to the other surface of the inner ring 11. Therefore, external foreign matter coming from the other side in the axial direction bumps against the first blocking portion 241, and is guided along the inclined portion 243 and the second blocking portion 245 to be guided to the ground. If the second blocking portion 245 is disposed on the other side of the inner surface of the inner ring 11, part of the foreign matter accumulated between the inner ring 11 and the distal portion 50 is re- And enters between the inner ring 11 and the second blocking portion 245. Accordingly, the other surface of the second cut-off portion 245 is disposed on one axial side of the inner surface of the inner ring 11, as appropriate.

The second blocking portion 245 is disposed on the other side in the axial direction of the first blocking portion 241 by the inclined portion 243 and the first and second sealing lips 151 and 153 are disposed on the second blocking portion 245 As shown in Fig. By forming the space between the other surface of the first vertical portion 125 and the one surface of the second blocking portion 245 relatively wider than the space between the other surface of the encoder 90 and one surface of the first blocking portion 241, The first and second sealing lips 151 and 153 have a constant length, and the sealing performance can be improved. Even if external foreign matter passes through the first and second sealing lips 151 and 153 by the narrow passage formed between the other surface of the encoder 90 and the first blocking portion 241, Is inhibited.

The radially outer side surface of the encoder 90 mounted on the second vertical portion 127 is separated from the inner circumferential surface of the cylindrical portion 230 of the second support body 220 by a first separation distance D1, The radially inward end of the second blocking portion 245 of the supporter 220 and the third inner ring surface 11c of the inner ring 11 are separated by the second separation distance D2. At this time, the first and second separation distances D1 and D2 are set to be substantially equal to each other.

For example, if the first separation distance D1 is set to be larger than the second separation distance D2, if a load is applied to the wheel bearing 1 due to an external impact or the like, minute vibration or deformation may occur in the radial direction At this time, even if the second distance D2 is reduced and the second support body 220 comes into contact with the third inner ring surface 11c, the radially outer side surface of the encoder 90 having the first distance D1 A space is still generated between the inner circumferential surfaces of the cylindrical portion 230.

Therefore, even if the first and second separation distances D 1 and D 2 are minimized so as to suppress the intrusion of foreign matter as much as possible, even if they move in the radial direction of the wheel bearing 1 as described above, The first and second separation distances D1 and D2 are set to be substantially equal to each other so as to be movable within the separation distances D1 and D2. At this time, the first and second separation distances D1 and D2 are preferably about 0.5 mm so as to accommodate the radial movement of the wheel bearing 1 while minimizing the infiltration of foreign matter from the outside.

As described above, the maze is formed by the first support body 120 and the second support body 220, and the rubber member 150 is formed near the entrance of the maze to further complicate the maze structure, The intrusion is effectively suppressed. At this time, the encoder 90 may be positioned close to the exit of the maze to fundamentally improve the damage caused by foreign matter.

Even if the foreign matter enters the minute gap formed between the second support body 220 and the third inner ring face 11c, the first and second sealing lips 151 and 153 having the inclination toward the radially inward and the other axial direction The radial path is blocked, making further entry difficult. Particularly, the foreign substances intruding into the upper gap can no longer enter the radial direction on the third inner ring surface 11c and are accumulated on the third inner ring surface 11c. The foreign substances accumulated in this way flow along the outer peripheral surface of the inner ring 11 It is removed to the ground.

Furthermore, according to the embodiment of the present invention, since the gap between the outer ring 12 and the inner ring 11 is sealed and the encoder 90 is mounted inside the gap, even if there is no separate encoder protection cap It is possible to effectively prevent damage of the encoder from external foreign matter. Therefore, the manufacturing cost of the encoder cap can be reduced.

The encoder seal assembly 100 according to the embodiment of the present invention may be configured such that after mounting the first support 120 having the encoder 90 and the rubber member 150 integrally, Is mounted on the other side in the axial direction of the first support body (120).

Claims (13)

An inner ring coupled to an outer circumferential surface of a rotating rotor and rotated together with the rotor, and an outer ring spaced apart from the inner ring and coupled to the fixed body so as to be relatively rotatable with the rotor, An encoder seal assembly adapted to seal a space between inner rings,
A first support mounted on an outer circumferential surface of the inner ring and extending radially outward;
A second support mounted on an inner circumferential surface of the outer ring, the other end of the second support extending radially inward from the other side of the first support;
A rubber member for sealing a space formed between the first support and the second support; And
An encoder mounted on the first support and rotated integrally with the first support;
, ≪ / RTI &
Wherein the encoder is located radially outwardly of the rubber member.
The method according to claim 1,
The inner ring
An inner race raceway formed in a curved shape at one side thereof;
A first inner ring surface extending axially from the other end of the inner race raceway to the other side;
A second inner ring surface bent and extended radially inward from the other end of the first inner ring surface; And
A third inner ring surface extending from the radially inner end of the second inner ring surface to the other axial end;
/ RTI >
Wherein the first support body is mounted on the first and second inner ring surfaces and extends radially outward and the second support body is mounted on the inner circumferential surface of the outer ring and extends so as to be adjacent to the third inner ring surface. .
3. The method of claim 2,
Wherein the radially outer end of the encoder is mounted to surround at least a portion of the first support.
The method of claim 3,
The first support
A first extending portion press-fitted into the first inner ring surface and extending in the axial direction;
A second extending portion bent 180 degrees from one end of the first extending portion and extending to the other side in the axial direction;
A first vertical part bent radially inward from the other end of the first extension part and coupled to the second inner ring surface; And
A second vertical part extending radially outward from the other end of the second extension part;
Lt; / RTI >
And the second vertical portion extends adjacent one surface of the second support.
5. The method of claim 4,
The radially outer side surface of the encoder is spaced apart from the one surface of the second support member by a first spacing distance and the radially inner end of the second support member is spaced apart from the third inner ring surface by a second spacing distance, Wherein the spacing distance and the second spacing distance are substantially the same.
6. The method of claim 5,
Wherein the first and second spacing distances are set to 0.5 mm.
5. The method of claim 4,
Wherein the rubber member is configured to surround a part of the first vertical portion,
Wherein at least one sealing lip contacting the one surface of the second support body is formed on the rubber member.
8. The method of claim 7,
Wherein the rubber member is attached to a gap formed between the other end of each of the first and second extensions.
8. The method of claim 7,
Wherein the sealing lips are at least axially other side and radially inwardly tapered.
8. The method of claim 7,
The second support
A cylindrical portion coupled to an inner circumferential surface of the outer ring;
A first blocking portion extending radially inward from the other end of the cylindrical portion;
An inclined portion that is inclined radially inward from the radially inward end of the first blocking portion and in the other axial direction; And
A second blocking portion extending radially inward from the inclined portion;
Wherein the seal assembly comprises:
11. The method of claim 10,
And the other surface of the second blocking portion is disposed on one axial side of the other surface of the inner ring.
12. The method of claim 11,
Wherein the at least one sealing lip contacts one surface of the second blocking portion.
12. An assembly comprising an encoder seal assembly according to any one of claims 1 to 12,
The rotating body is a hub connected to wheels,
And an electric rolling element is interposed between the inner ring and the outer ring.
KR1020150121851A 2015-08-28 2015-08-28 Encoder seal assembly, and wheel bearing having the same for vehicle KR101751895B1 (en)

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JP4140293B2 (en) * 2002-07-05 2008-08-27 株式会社ジェイテクト Pulsar ring and rolling bearing device for rotation detector
JP5167710B2 (en) * 2007-07-17 2013-03-21 日本精工株式会社 Hub unit bearing

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