CN203189533U - Sealing device and bearing assembly with sealing - Google Patents
Sealing device and bearing assembly with sealing Download PDFInfo
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- CN203189533U CN203189533U CN 201320239762 CN201320239762U CN203189533U CN 203189533 U CN203189533 U CN 203189533U CN 201320239762 CN201320239762 CN 201320239762 CN 201320239762 U CN201320239762 U CN 201320239762U CN 203189533 U CN203189533 U CN 203189533U
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Abstract
The utility model relates to a sealing device and a bearing assembly with sealing, and realizes a structure of improving the splashing resistance performance of a lateral lip arranged in the sealing device and inhibiting foreign matters such as mud water from invading the internal space of a bearing. The sealing device is structurally characterized in that the base end part of a middle lip (23) is supported by a core bar (15), the middle lip (23) faces the radial middle part of a round wheel part (18) and extends in the axial direction, in addition, the front end edge of the middle lip is in throughout sliding contact with the axial outer side surface of the round wheel part (18), and in addition, the middle lip (23) is thinner than a lateral lip (20), so a shape capable of deforming in the radial direction to change the sliding contact position is formed, and in addition, the volume of a second pressure space (26a) surrounded and sealed by the middle lip (23), a lubricating grease lip (22) and an oil thrower (13) is equal to or slightly smaller than the volume of a first pressure space (25a) surrounded and sealed by the lateral lip (20), the middle lip (23) and the oil thrower (13).
Description
Technical field
The utility model relates to a kind of seal arrangement and possesses the improvement of bearing unit of the band sealing of sealing device, wherein, the sealing device for example is being used for that the automotive wheel rotation is being supported in the bearing unit of draft hitch freely with the open-ended obstruction of annulus, and this annulus is present in rotation and sidewinders circle and the mutual opposed side face of Stationary side raceway circle each other and be provided with a plurality of rolling elements.
Background technique
In the past, for the automotive wheel rotation is supported in draft hitch freely, the bearing unit 1 of band sealing as shown in Figure 7 is widely known by the people by being described in patent documentation 1 grade.The bearing unit 1 of this band sealing will be concentric arrangement mutually as the outer ring 2 of Stationary side raceway circle with as the wheel hub 3 that circle is sidewindered in rotation.And, the inner peripheral surface that is arranged at this outer ring 2 and respectively as the biserial outer ring raceway 4 of Stationary side raceway, 4 and be arranged on the outer circumferential face of above-mentioned wheel hub 3 and the biserial inner ring raceway 5,5 that sidewinders as rotation respectively between, to be that the mode of row disposes a plurality of as the ball 6 of rolling element, 6 according to two rolling elements respectively, and, be configured utilizing the wrapping angle of type (DB type) back-to-back to give under the state of precompressed.This each ball 6,6 is held frame 7 respectively, 7 rollings are kept freely.By such structure, wheel hub 3 rotations are supported on the internal side diameter of the outer ring 2 that is supported and fixed on draft hitch (not shown) freely.
In addition, leaning on the part of axial outer end of above-mentioned wheel hub 3, be provided with for the rotation flange 35 that the wheel that constitutes wheel is carried out support fixation.In addition, the so-called axial outside refers to the width direction outside at the state lower body of assembling to automobile, i.e. the left side of each figure.With respect to this, the width direction center side that will be in the right side of each figure is called axial inboard.
Between the outer circumferential face of the inner peripheral surface of above-mentioned outer ring 2 and above-mentioned wheel hub 3, the axial both ends open that is provided with above-mentioned each ball 6,6 annulus 8 is spreaded all over by seal ring 9 and combined seal ring 10 respectively to be stopped up allly entirely.Above-mentioned seal ring 9 possesses the arbor 11 of sheet metal system and the Sealing 12 of elastic material system.And, under the state on the embedded axial outer end portion inner peripheral surface that is fixed in outer ring 2, make each front-end edge of formed many sealing lips on the above-mentioned Sealing 12 and the axial inner side surface of above-mentioned rotation flange 35 and the intermediate portion outer circumferential face of above-mentioned wheel hub 3 spread all over full week ground sliding contact with interference fit above-mentioned arbor 11.
As shown in Figure 8, combinations thereof seal ring 10 comprises oil thrower 13 and seal ring 14.Wherein, oil thrower 13 is to form the cross section and be the L font and whole be circular oil thrower by sheet metal being carried out bending forming, comprises cylindrical part 17 and the round wheel part 18 that bends laterally from the axial ora terminalis radius vector of this cylindrical part 17.Such oil thrower 13 is by being embedded in above-mentioned cylindrical part 17 outward on the axial inner ends portion outer circumferential face of above-mentioned wheel hub 3 (together constituting the inner ring of wheel hub 3 with hub body) with interference fit, thereby is fixed on the wheel hub 3.
In addition, above-mentioned seal ring 14 possesses arbor 15 and the sealing elastic member 16 of sheet metal system.Above-mentioned sealing has many (being three in illustrated embodiment) sealing lips with elastic member 16, possesses lateral lip (side lip) 20, main lip (main lip) 21 and lubricating grease lip (grease lip) 22.
In addition, above-mentioned arbor 15 is to form the cross section and slightly be L font and whole for circular by sheet metal being carried out bending forming.Such seal ring 14 is by being fixed on the outer ring 2 on the axial inner ends portion inner peripheral surface that arbor 15 is embedded in above-mentioned outer ring 2 with interference fit.In addition, under this state, make the axial outer side surface outer circumferential face of sliding contact, the front-end edge that makes above-mentioned main lip 21 and lubricating grease lip 22 and above-mentioned cylindrical part 17 sliding contact of front-end edge and the above-mentioned round wheel part 18 of above-mentioned lateral lip 20 respectively with spreading all over full week with spreading all over full week.In addition, the external diameter end by making round wheel part 18 and the inner peripheral surface of above-mentioned seal ring 14 approach and are opposed, thereby form labyrinth seal structure 30.
And then in order to measure the rotating speed by the wheel of rotation flange 35 support fixation of above-mentioned wheel hub 3, on the axial inner side surface of the oil thrower 13 that constitutes aforesaid combined seal ring 10, spread all over complete adding fixedly has round wheel shape encoder 19 allly.This encoder 19 is made magnetization in the axial direction by permanent magnet such as ferro-gum, plastic magnets.The direction of magnetization alternately and equally spaced changes on circumferentially.Therefore, on the axial inner side surface as the above-mentioned encoder 19 of detected face, the S utmost point and the N utmost point alternately and equally spaced dispose on circumferentially.The detection unit that makes not shown sensor is mutually opposed with the detected face of such encoder 19, thereby freely measures the rotating speed of the wheel that together rotates with above-mentioned wheel hub 3.
As mentioned above, stop up entirely by utilizing above-mentioned seal ring 9 and combinations thereof seal ring 10 that the axial both ends open of above-mentioned annulus 8 is spreaded all over respectively allly, seek to prevent from being present in lubricating grease in the annulus 8 and leak into space outerpace and prevent from being present in the moisture of space outerpace or foreign matter such as dust and dirt is invaded in the annulus 8.Especially, in the bearing unit 1 of the band sealing that the automotive wheel rotation is supported in freely draft hitch, when waiting conduct to do the time spent from the moment load of the reaction force on road surface when rotated, outer ring 2 and wheel hub 3 relative tilts, but, in order also to guarantee the durability with the bearing unit 1 of sealing in this case, guarantee that fully the sealing of above-mentioned seal ring 9 and combinations thereof seal ring 10 is important.
On the other hand, seal ring 9 and combined seal ring 10 are used under harsh conditions such as muddy water in the splash in use.Especially, under the situation of combined seal ring 10, by behind the above-mentioned labyrinth seal structure 30, entered the communicating space 31 that is surrounded by above-mentioned arbor 15 and above-mentioned lateral lip 20 and be communicated with space outerpace by the splash of the muddy water that splashes from the road surface of tire of rotation when vehicle travels etc.Weakened imposing manner though invade the splash of the muddy water of this communicating space 31 by labyrinth seal structure 30, but still with the state that keeps certain speed (or pressure, momentum) and on circumferentially ground, top (being not that full week is all identical) and lateral lip 20 collisions.At this moment, though lateral lip 20 is subjected to rock deformation pressure, but, work as pneumatic spring by surrounded first pressure space 25 that seals by lateral lip 20, above-mentioned main lip 21 and above-mentioned oil thrower 13, this first pressure space 25 is brought into play the effect of buffering and is blocked above-mentioned rock deformation pressure, thereby relaxes the distortion of lateral lip 20.
When lateral lip 20 deformed, the part of the front-end edge of lateral lip 20 was floated from the axial outer side surface as the above-mentioned round wheel part 18 of object parts, thereby had the more possibility of depths of inside that foreign matters such as muddy water enter first pressure space 25 by this part.
The volume of above-mentioned first pressure space 25 is got over the wonderful works pneumatic spring and is played a role all the more effectively, but, finite volume by the part of above-mentioned oil thrower 13 and 15 encirclements of above-mentioned arbor in order to obtain the effect of above-mentioned labyrinth seal structure 30, also needs to guarantee in advance the volume of communicating space 31.
In addition, owing to the volume that is surrounded second pressure space 26 that seals by main lip 21, lubricating grease lip 22 and oil thrower 13 is very little, and main lip 21 weak points, therefore, the pressure that is accompanied by first pressure space 25 changes and main lip 21 deforms, thereby the situation that second pressure space 26 stops the pressure of first pressure space 25 to change does not almost take place.Therefore, be above-mentioned first pressure space 25 only owing to what play a role as the pneumatic spring with the effect that relaxes above-mentioned lateral lip 20 distortion, so anti-the spattering property of combined seal ring 10 is limited.
As the structure of the sealing that be used for to improve combined seal ring, the structure of putting down in writing in the patent documentation 2 is: make the side of the seal ring opposite side in the rotation side round wheel part of the front-end edge that constitutes outer second sealing lip that is embedded in second seal ring on the outer ring and oil thrower spread all over full week ground sliding contact.According to such structure, invaded in the inner space though seek to prevent foreign matter really,, not only owing to increasing, the parts number of packages cause cost to increase, and owing to the sliding contacting part increase causes rotational resistance (dynamic torque) increase, therefore unsatisfactory.
Patent documentation
[patent documentation 1] TOHKEMY 2008-233110 communique
[patent documentation 2] TOHKEMY 2008-151311 communique
The model utility content
The utility model is the innovation and creation of carrying out in order to realize following structure in view of aforesaid situation, this structure is: in the seal arrangement of the open-ended obstruction that will be present in the Stationary side that constitutes bearing unit and rotation side two raceway circles annulus each other, improve anti-the spattering property of lateral lip set on the seal arrangement and suppress foreign matter such as muddy water and invade this structure in the annulus.
First technological scheme of the present utility model is seal arrangement, and it possesses: arbor; And be fixed in sealing elastic member on this arbor, above-mentioned sealing is provided with lateral lip, middle interlabium and lubricating grease lip with elastic member, and, make above-mentioned lateral lip, above-mentioned middle interlabium and front end and the complete all sliding contacts of object parts separately of above-mentioned lubricating grease lip, wherein, above-mentioned lateral lip, above-mentioned middle interlabium and above-mentioned lubricating grease lip base end part are separately supported by arbor.
Especially, in seal arrangement of the present utility model, surrounded by interlabium, above-mentioned lubricating grease lip and above-mentioned object parts in above-mentioned and the volume of second pressure space of sealing, for by by above-mentioned lateral lip, above-mentioned in interlabium and above-mentioned object parts first pressure space that surrounded and seal volume 70%～100%.
Second technological scheme of the present utility model is the bearing unit of band sealing, and it comprises: circle and Stationary side raceway circle are sidewindered in counterrotating rotation under the state that is concentric arrangement mutually; A plurality of rolling elements, these a plurality of rolling elements rotate be arranged on freely that rotation is sidewindered and the Stationary side raceway between, above-mentioned rotation is sidewindered and above-mentioned Stationary side raceway is separately positioned on above-mentioned rotation and sidewinders on circle and the mutual opposed side face of above-mentioned Stationary side raceway circle; And the seal arrangement of first technological scheme of the present utility model, the sealing device will be present in open-ended the sealing that circle and the mutual opposed side face of above-mentioned Stationary side raceway circle annulus are each other sidewindered in above-mentioned rotation.
The bearing unit that the band sealing of the present utility model of the seal arrangement that constitutes is as mentioned above arranged according to embedding, in the seal arrangement that the axial end portion opening that will be present in the Stationary side that constitutes bearing unit and rotation side two raceway circles annulus each other stops up, can improve anti-the spattering property of lateral lip set on the seal arrangement and suppress foreign matter such as muddy water and invade in the annulus.
Namely, form following structure: when the splash such as muddy water that splash when the tire that is rotated apply rock deformation pressure to lateral lip, the pressure of first pressure space rises and the distortion of mitigation lateral lip, and, the pressure of second pressure space by middle interlabium and the first pressure space adjacency rises, thereby supports this structure of first pressure space by second pressure space.
Thus, because lateral lip can bear large-scale rock deformation pressure, therefore, anti-the spattering property raising of lateral lip, and then can improve the anti-muddy water of seal arrangement.Consequently, excellent sealing performance can be obtained chronically, and the endurance with the bearing unit of sealing can be guaranteed.
Description of drawings
Fig. 1 represents first example of the utility model mode of execution, is the figure identical with Fig. 8.
Fig. 2 represents the variation of first example of the utility model mode of execution, is the figure identical with Fig. 8.
Fig. 3 represents second example of the utility model mode of execution, is the figure identical with Fig. 8.
Fig. 4 represents the 3rd example of the utility model mode of execution, is the figure identical with Fig. 8.
Fig. 5 represents the variation of the 3rd example of the utility model mode of execution, is the figure identical with Fig. 8.
Fig. 6 represents the 4th example of the utility model mode of execution, is the part enlarged view of seal ring.
Fig. 7 is the sectional view of an example of bearing unit of the band sealing of expression existing structure.
Fig. 8 is the part enlarged view of the combined seal ring of Fig. 7.
Embodiment
[first example of mode of execution]
Fig. 1 represents first example of mode of execution of the present utility model.In addition, comprise present embodiment interior, the bearing unit of seal arrangement of the present utility model and band sealing is characterised in that following structure: by the oil thrower 13 that constitutes combined seal ring 10a is studied with the fastening state that elastic member 16a goes up set middle interlabium 23 with the same sealing that constitutes seal ring 14a, and be formed for suppressing the inside that foreign matter is invaded the first pressure space 25a of combinations thereof seal ring 10a, and keep the structure of the sealability of this combined seal ring 10a for a long time well.
Structure and effect about other parts, since with the bearing unit 1 that comprises above-mentioned band shown in Figure 7 sealing interior, be used for for example the wheel rotation being supported in freely draft hitch in the past since the bearing unit of the band sealing used of the various support wheel that are widely known by the people same, therefore omit or simple diagram and the explanation that repeats, below stress the characteristic that this is routine.
Combined seal ring 10a as the present embodiment seal arrangement possesses: oil thrower 13; And seal ring 14a, and be positioned at the axial inner ends of above-mentioned annulus 8 and opening portion is stopped up.Above-mentioned oil thrower 13 slightly is the L font with the cross section and forms circularly, possesses: the cylindrical part 17 that is embedded in the axial inner ends portion outer circumferential face of above-mentioned wheel hub 3 outward; Reach the round wheel part 18 that extends towards radial outside from the axial inner ends portion of this cylindrical part 17.And, in the axial inboard (right side of Fig. 1) of above-mentioned round wheel part 18, at the encoder 19 that toroidal upwards is installed in whole week.On the axial inner ends face of encoder 19, the N utmost point and the S utmost point are alternately and equally spaced are configured in week upwards.
On the other hand, seal ring 14a possesses: arbor 15; And sealing elastic member 16a.Above-mentioned arbor 15 with the cross section slightly be the L font form circular, and to be entrenched on the axial inner ends portion inner peripheral surface of above-mentioned outer ring 2 with above-mentioned oil thrower 13 opposed modes.And, above-mentioned sealing forms and slightly is circular by for example having the isoelastic elastomer of rubber with elastic member 16a, wholely circumferentially be fixed in spreading all over 13 opposed of oil throwers of arbor 15, and lateral lip 20, middle interlabium 23 and lubricating grease lip 22 that base end part is supported by arbor 15 be separately positioned on mutually do not disturb on the position of (base end part by making each lip is supported by arbor 15 respectively and makes the action interlock not of each lip and other lips).
Above-mentioned lateral lip 20 extends obliquely towards the radial outside of above-mentioned round wheel part 18, and makes the axial outer side surface of its front-end edge and round wheel part 18 spread all over full week ground sliding contact.Above-mentioned lubricating grease lip 22 extends obliquely towards the axial outside of above-mentioned cylindrical part 17, and makes the outer circumferential face of its front-end edge and cylindrical part 17 spread all over full week ground sliding contact.In addition, in the present embodiment, oil thrower 13 is equivalent to the object parts.
And, make the volume that is equaled or be slightly less than the first pressure space 25a that is surrounded and seal by lateral lip 20, middle interlabium 23 and oil thrower 13 by the volume of the second pressure space 26a of middle interlabium 23, lubricating grease lip 22 and oil thrower 13 encirclements and sealing, the volume of the first pressure space 25a.Be specially: the volume of the second pressure space 26a is controlled to be 70%～100% of the first pressure space 25a.
The bearing unit that the present embodiment band sealing of the seal arrangement that constitutes is as mentioned above arranged according to embedding, in combined seal ring 10a, can improve anti-the spattering property of the lateral lip 20 that is arranged on the seal ring 14a and suppress foreign matter such as muddy water and invade in the annulus 8, wherein, combinations thereof seal ring 10a is the seal arrangement with the open-ended obstruction of annulus 8, annulus 8 be present in constitute bearing unit as the outer ring 2 of Stationary side raceway circle and sidewinder as rotation between the wheel hub 3 of circle.
Namely, form following structure: when the splash such as muddy water that splash when the tire that is rotated have applied rock deformation pressure to lateral lip 20, the pressure of the first pressure space 25a rises and the distortion of mitigation lateral lip 20, and, middle interlabium 23 deforms, and the pressure of the second pressure space 26a by middle interlabium 23 and the first pressure space 25a adjacency rises, thereby supports first this structure of pressure space 25a by the second pressure space 26a.Thus, because lateral lip 20 can bear large-scale rock deformation pressure, therefore, can improve anti-the spattering property of lateral lip 20, and then can improve the anti-muddy water of combined seal ring 10a.Consequently, excellent sealing performance can be obtained chronically, and the endurance with the bearing unit of sealing can be guaranteed.
In addition, by making the thin thickness with respect to the middle interlabium 23 of round wheel part 18 sliding contact vertically, also can obtain to reduce the effect of torque.
In addition, because because the rock deformation pressure of splash makes lateral lip 20 cause the pressure of the first pressure space 25a to rise to first pressure space 25a side distortion (or displacement), therefore interlabium 23 is to second pressure space 26a side distortion (or displacement) in, but the distortion of middle interlabium 23 (displacement) amount is littler than distortion (displacement) amount of lateral lip 20.Therefore, thereby equal or the volume that is slightly less than the first pressure space 25a rises the pressure of the second pressure space 26a and remains with the first pressure space 25a on an equal basis by the volume that makes the second pressure space 26a, can further improve the effect that the second pressure space 26a supports the first pressure space 25a.In addition, the ratio of the first pressure space 25a and the volume of the second pressure space 26a is decided after the rigidity of interlabium 23 etc. in considering.
Fig. 2 represents the variation of first example of the utility model mode of execution.In the combined seal ring 10e of this variation, will be arranged on the seal ring 14e with the fastening lip 33 that the round wheel part 18 of oil thrower 13d engages in the axial direction, and, will be arranged on the oil thrower 13d with the kink 34 that lubricating grease lip 22 engages in the axial direction.Thus, prevented the situation that the free state lower seal 14e before combined seal ring 10e is assembled into the bearing unit of being with sealing separates with oil thrower 13d.
Above-mentioned fastening lip 33 forms one with sealing with elastic member 16e, and, this fastening lip 33 is along with extending obliquely to the axial outside towards radially inner side from the close axial inner ends part of seal ring 14e (being entrenched in the cylindrical portions may of the arbor 15 on the outer ring 2 part near axial inner ends), and makes the axial inner side surface of its front end and round wheel part 18 approach also opposed.In addition, fastening lip 33 upwards arranged across notch part 36 intermittently in week.Thus, the muddy water etc. of invading communicating space 31 can be expelled to the outside from notch part 36.In addition, thus also can upwards the fastening lip be set continuously in week forms labyrinth seal structure between fastening lip and round wheel part 18.
Above-mentioned kink 34 is that the axial outer end of cylindrical part 17 part is bent and form the part of conical surface shape to the external diameter lateral bending, and its outer circumferential face is along with towards the axial outside and diameter diminishes.
Under the situation of the combined seal ring 10e of this variation, above-mentioned in interlabium 23 in order to form the first pressure space 25a and the second pressure space 26a with round wheel part 18 sliding contact vertically of oil thrower 13d, and, together produce the power of seal ring 14e being drawn back (make and separate) with oil thrower 13d with lateral lip 20.With respect to this, the parts that seal ring 14e and oil thrower 13d are remained one only for the cylindrical part 17 of the oil thrower 13d lubricating grease lip 22 of sliding contact radially.Therefore, when the combined seal ring 10e with free state carries or when embedding operation in the bearing unit etc., seal ring 14e may separate with oil thrower 13d.
In this variation, when seal ring 14e and oil thrower 13d vertically when separated direction relatively moves, above-mentioned fastening lip 33 engages with the round wheel part 18 of oil thrower 13d, and, above-mentioned kink 34 engages with lubricating grease lip 22, thereby has prevented the situation that seal ring 14e separates with oil thrower 13d.Therefore, the operation of the combined seal ring 10e of monomer is become easily, thereby can realize carrying and the reduction of the cost during assembling procedure.In addition, under combined seal ring 10e was embedded into state in the bearing unit, fastening lip 33 did not contact with round wheel part 18, lubricating grease lip 22 and cylindrical part 17 sliding contacts.In addition, also can constitute any one in fastening lip 33 and the kink 34 only is set.
[mode of execution second example]
Fig. 3 represents second example of the utility model mode of execution.In the combined seal ring 10b as the seal arrangement of present embodiment, be fixed on the sealing on the above-mentioned arbor 15 also supported base end part with elastic member 16b by arbor 15 lateral lip 20, middle interlabium 23b and lubricating grease lip 22 and be separately positioned on mutually and do not disturb on the position of (with the action of other lips interlock not).And above-mentioned middle interlabium 23b is formed by arbor 15 support base end parts and cross section and slightly is zigzag, and, make its front-end edge and recess 27 spread all over full week ground sliding contact, wherein, internal side diameter and cross section that above-mentioned recess 27 is formed on round wheel part 18 slightly are horizontal U font.
Above-mentioned recess 27 is the parts that make the tie point part of round wheel part 18 and cylindrical part 17 expand all sidedly and to form towards axial inboard, and the cross section forms and slightly is horizontal U font, and the internal side diameter side face of recess 27 (the axial outer side surface of the recess 27 and side face of internal side diameter) is connected continuously and smoothly with the outer circumferential face of cylindrical part 17.
In above-mentioned interlabium 23b with the radially inner side of arbor 15 part as cardinal extremity along with towards axial inboard and after radial outside extends obliquely, be bent into acute angle and along with extending obliquely to the axial outside towards radially inner side, bending and along with extending obliquely to radially inner side towards the axial outside again, thus make its front-end edge and recess 27 sliding contacts.Middle interlabium 23b like this compares thin thickness and cross section for slightly being the zigzag shape with above-mentioned lateral lip 20, therefore can be with respect to the variation of pressure and distortion neatly.
In addition, the front end bifurcated of middle interlabium 23b is three prominent bars 24,24,24, and each prominent bar 24 spreads all over full week ground sliding contact with the internal side diameter side face of recess 27, axial outer side surface, outside diameter side face respectively.And, guarantee necessary magnitude of interference by the flexibility of interlabium 23b in utilizing, and make each prominent bar 24 and recess 27 sliding contacts with utilizing little contact pressure stability that thus, combined seal ring 10b is seeking to obtain sufficient sealability when torque reduces.
In the present embodiment, also make the volume that is equaled or be slightly less than the first pressure space 25b that is surrounded and seal by lateral lip 20, middle interlabium 23b and oil thrower 13a by the volume of the second pressure space 26b of middle interlabium 23b, lubricating grease lip 22 and oil thrower 13a encirclement and sealing, but slightly be zigzag owing to make middle interlabium 23b form the cross section, therefore can easily adjust the volume of each pressure space.Especially diminish a little and when the volume of the first pressure space 25b was increased, present embodiment was fit at the volume that makes the second pressure space 26b.
In addition, the front end of the middle interlabium 23b that flexibility is high is arranged on the position that can rotatablely move a little in recess 27, and can be a little to axial displacement, therefore, as mentioned above, even thereby above-mentioned outer ring 2 and above-mentioned wheel hub 3 relative tilt oil thrower 13a and seal ring 14b are relatively taken place under the situation of displacement working owing to the moment load, the front end of middle interlabium 23b can not leave from recess 27 yet, thereby can keep stable sealability.
And then, when water-wash resistance is good, viscosity is low (firmly) and (for example be not easy moisture lubricating grease, urea system and the low lubricating grease of viscosity) when being encapsulated in the recess 27, can improve the lubricity of each prominent bar 24 of interlabium 23b front end in being arranged on and seek low torqueization, and can further improve sealability.
In addition, decide after the front end addendum modification of the rigidity of shape interlabium 23b in considering of the shape of the ratio of the first pressure space 25b and the volume of the second pressure space 26b and recess 27 or middle interlabium 23b and imagination.The structure of other parts and effect and above-mentioned first example are same.
[the 3rd example of mode of execution]
Fig. 4 represents the 3rd example of the utility model mode of execution.In the combined seal ring 10c as the seal arrangement of present embodiment, middle interlabium 23c supports base end parts by above-mentioned arbor 15 and extends to axial inboard towards above-mentioned round wheel part 18, and, make its front end and the outer circumferential face of the end difference 32 of the radially intermediate portion that is formed on round wheel part 18 spread all over full week ground sliding contact.Middle interlabium 23c like this is arranged on other the action of sealing lip not on the position of interlock, and, make thickness be thinner than lateral lip 20, thus can be with respect to the variation of pressure and distortion neatly.
Above-mentioned end difference 32 is parts that the radially intermediate portion of round wheel part 18 is formed towards the bending of axioversion ground, and its outer circumferential face forms along with towards axial inboard and diameter becomes big conical surface shape.
In the present embodiment, also make by middle interlabium 23c, the volume of the second pressure space 26c that lubricating grease lip 22 and oil thrower 13b surround and seal equals or is slightly less than by lateral lip 20, the volume of the first pressure space 25c that middle interlabium 23c and oil thrower 13b surround and seal, but owing to make the front end of middle interlabium 23c and the plane of inclination sliding contact of end difference 32, therefore prevented pressure because of the first pressure space 25c rise cause in interlabium 23c front end towards moving radially, and form the structure that supports the pressure rising of the first pressure space 25c by the radial deformation on the axial intermediate portion of middle interlabium 23c (distortion that barrier film is such).
In addition, owing to forming towards the outstanding circular shape of internal side diameter, the cross section with middle interlabium 23c front end improves sealing, and interlabium 23c is that free end successfully is deformed into septiform with the front end in making, and therefore can further improve the effect of utilizing the second pressure space 26c to support the pressure oscillation of the first pressure space 25c.
Fig. 5 represents the variation of the 3rd example of the utility model mode of execution.In the combined seal ring 10d of this variation, make the radially intermediate portion of round wheel part 18 expand all sidedly towards axial inboard and form the cross section and be the recess 27a that slightly is horizontal V font, and the internal side diameter side face of front end and the recess 27a of interlabium 23d in making (the axial outer side surface of recess 27a and be the side face of the conical surface shape of internal side diameter) spreads all over full week ground sliding contact.In addition, the cross section with the front end of middle interlabium 23d forms towards the outstanding triangle of internal side diameter.The structure of other parts and effect and above-mentioned first example are same.
[the 4th example of mode of execution]
Fig. 6 represents the 4th example of the utility model mode of execution, is to be mode of execution when being suitable for the utility model among the seal ring 9a at the seal arrangement with the sealing of the axial outer end opening of annulus 8.
Above-mentioned seal ring 9a possesses: arbor 11; And Sealing 12a.Above-mentioned arbor 11 is entrenched on the axial inner ends portion inner peripheral surface of above-mentioned outer ring 2, and slightly is the L font with the cross section and forms circular.Above-mentioned Sealing 12a forms and slightly is toroidal by having the isoelastic elastomer of rubber.And Sealing 12a spreads all over and circumferentially is fixed on the arbor 11, and lateral lip 20a, middle interlabium 23e that base end part is supported by arbor 11 and lubricating grease lip 22a are separately positioned on the position of non-interfering (with the action of other lips interlock not).
Seal arrangement in each mode of execution of the application can make up mutually and be used.For example, the fastening lip 33 in the variation of mode of execution first example or kink 34 can be applicable in the combined seal ring of mode of execution second example～the 3rd example.
The bearing unit of seal arrangement of the present utility model and band combined seal ring is from its effect of abundant acquisition, effect aspect, and optimum uses with bearing unit as supporting for the wheel that automotive wheel is supported in draft hitch.
Claims (2)
1. seal arrangement, it possesses: arbor; And be fixed in sealing elastic member on this arbor, described sealing is provided with lateral lip, middle interlabium and lubricating grease lip with elastic member, and, make described lateral lip, described middle interlabium and front end and the complete all sliding contacts of object parts separately of described lubricating grease lip, wherein, described lateral lip, described middle interlabium and described lubricating grease lip base end part are separately supported by described arbor
It is characterized in that,
The volume of second pressure space that is surrounded and seal by interlabium, described lubricating grease lip and described object parts in described, for by described lateral lip, described in interlabium and described object parts first pressure space that surrounds and seal volume 70%～100%.
2. the bearing unit with sealing is characterized in that, described bearing unit comprises:
Circle and Stationary side raceway circle are sidewindered in counterrotating rotation under the state that is concentric arrangement mutually;
A plurality of rolling elements, these a plurality of rolling elements rotate be arranged on freely that rotation is sidewindered and the Stationary side raceway between, described rotation is sidewindered and described Stationary side raceway is separately positioned on described rotation and sidewinders on circle and the mutual opposed side face of described Stationary side raceway circle; And,
Seal arrangement described in claim 1, sealing device will be present in open-ended the sealing that circle and the mutual opposed side face of described Stationary side raceway circle annulus are each other sidewindered in described rotation.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-101923 | 2012-04-27 | ||
| JP2012101923 | 2012-04-27 | ||
| JP2013-032681 | 2013-02-22 | ||
| JP2013032681A JP2013242036A (en) | 2012-04-27 | 2013-02-22 | Sealing device and bearing unit with seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203189533U true CN203189533U (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320239762 Expired - Fee Related CN203189533U (en) | 2012-04-27 | 2013-04-25 | Sealing device and bearing assembly with sealing |
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| JP2017125530A (en) * | 2016-01-13 | 2017-07-20 | Nok株式会社 | Sealing device |
| CN107893852A (en) * | 2016-10-04 | 2018-04-10 | 纳博特斯克有限公司 | Seal assembly and sealing mechanism |
| CN108027067A (en) * | 2015-09-25 | 2018-05-11 | Nok株式会社 | Box of tricks sealing device |
| CN109356938A (en) * | 2014-11-07 | 2019-02-19 | 光洋密封技术株式会社 | Sealing device |
| CN110036214A (en) * | 2016-11-25 | 2019-07-19 | Nok株式会社 | Sealing device and seal construction |
| CN111492161A (en) * | 2018-04-06 | 2020-08-04 | Nok株式会社 | Sealing device |
| CN112771293A (en) * | 2018-11-12 | 2021-05-07 | Nok株式会社 | Sealing device and grease adhesion method |
| CN113348310A (en) * | 2019-01-25 | 2021-09-03 | Ntn株式会社 | Method for manufacturing bearing device for wheel and bearing device for wheel |
| CN113994113A (en) * | 2019-06-26 | 2022-01-28 | Nok株式会社 | Sealing device |
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2013
- 2013-04-25 CN CN 201320239762 patent/CN203189533U/en not_active Expired - Fee Related
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| CN109356938A (en) * | 2014-11-07 | 2019-02-19 | 光洋密封技术株式会社 | Sealing device |
| CN108027067A (en) * | 2015-09-25 | 2018-05-11 | Nok株式会社 | Box of tricks sealing device |
| US20180209546A1 (en) * | 2015-09-25 | 2018-07-26 | Nok Corporation | Sealing device for differential mechanism |
| US11261968B2 (en) | 2015-09-25 | 2022-03-01 | Nok Corporation | Sealing device for differential mechanism |
| CN108027067B (en) * | 2015-09-25 | 2020-07-28 | Nok株式会社 | Sealing device for differential mechanism |
| JP2017125530A (en) * | 2016-01-13 | 2017-07-20 | Nok株式会社 | Sealing device |
| CN107893852A (en) * | 2016-10-04 | 2018-04-10 | 纳博特斯克有限公司 | Seal assembly and sealing mechanism |
| CN107893852B (en) * | 2016-10-04 | 2022-01-11 | 纳博特斯克有限公司 | Seal assembly and seal mechanism |
| CN110036214B (en) * | 2016-11-25 | 2020-11-24 | Nok株式会社 | Sealing device and sealing structure |
| CN110036214A (en) * | 2016-11-25 | 2019-07-19 | Nok株式会社 | Sealing device and seal construction |
| CN111492161A (en) * | 2018-04-06 | 2020-08-04 | Nok株式会社 | Sealing device |
| CN111492161B (en) * | 2018-04-06 | 2022-05-03 | Nok株式会社 | Sealing device |
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| CN112771293A (en) * | 2018-11-12 | 2021-05-07 | Nok株式会社 | Sealing device and grease adhesion method |
| CN112771293B (en) * | 2018-11-12 | 2023-08-22 | Nok株式会社 | Sealing device and grease adhering method |
| CN113348310A (en) * | 2019-01-25 | 2021-09-03 | Ntn株式会社 | Method for manufacturing bearing device for wheel and bearing device for wheel |
| CN113348310B (en) * | 2019-01-25 | 2023-09-15 | Ntn株式会社 | Method for manufacturing bearing device for wheel and bearing device for wheel |
| CN113994113A (en) * | 2019-06-26 | 2022-01-28 | Nok株式会社 | Sealing device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20210425 |
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| CF01 | Termination of patent right due to non-payment of annual fee |